diff options
Diffstat (limited to 'net/batman-adv')
40 files changed, 9944 insertions, 0 deletions
diff --git a/net/batman-adv/Kconfig b/net/batman-adv/Kconfig new file mode 100644 index 0000000..6c051ad --- /dev/null +++ b/net/batman-adv/Kconfig @@ -0,0 +1,25 @@ +# +# B.A.T.M.A.N meshing protocol +# + +config BATMAN_ADV + tristate "B.A.T.M.A.N. Advanced Meshing Protocol" + depends on NET + default n + ---help--- + + B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is + a routing protocol for multi-hop ad-hoc mesh networks. The + networks may be wired or wireless. See + http://www.open-mesh.org/ for more information and user space + tools. + +config BATMAN_ADV_DEBUG + bool "B.A.T.M.A.N. debugging" + depends on BATMAN_ADV != n + ---help--- + + This is an option for use by developers; most people should + say N here. This enables compilation of support for + outputting debugging information to the kernel log. The + output is controlled via the module parameter debug. diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile new file mode 100644 index 0000000..d936aec --- /dev/null +++ b/net/batman-adv/Makefile @@ -0,0 +1,39 @@ +# +# Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: +# +# Marek Lindner, Simon Wunderlich +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of version 2 of the GNU General Public +# License as published by the Free Software Foundation. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +# 02110-1301, USA +# + +obj-$(CONFIG_BATMAN_ADV) += batman-adv.o +batman-adv-y += aggregation.o +batman-adv-y += bat_debugfs.o +batman-adv-y += bat_sysfs.o +batman-adv-y += bitarray.o +batman-adv-y += gateway_client.o +batman-adv-y += gateway_common.o +batman-adv-y += hard-interface.o +batman-adv-y += hash.o +batman-adv-y += icmp_socket.o +batman-adv-y += main.o +batman-adv-y += originator.o +batman-adv-y += ring_buffer.o +batman-adv-y += routing.o +batman-adv-y += send.o +batman-adv-y += soft-interface.o +batman-adv-y += translation-table.o +batman-adv-y += unicast.o +batman-adv-y += vis.o diff --git a/net/batman-adv/aggregation.c b/net/batman-adv/aggregation.c new file mode 100644 index 0000000..3850a3e --- /dev/null +++ b/net/batman-adv/aggregation.c @@ -0,0 +1,273 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "aggregation.h" +#include "send.h" +#include "routing.h" + +/* calculate the size of the hna information for a given packet */ +static int hna_len(struct batman_packet *batman_packet) +{ + return batman_packet->num_hna * ETH_ALEN; +} + +/* return true if new_packet can be aggregated with forw_packet */ +static bool can_aggregate_with(struct batman_packet *new_batman_packet, + int packet_len, + unsigned long send_time, + bool directlink, + struct batman_if *if_incoming, + struct forw_packet *forw_packet) +{ + struct batman_packet *batman_packet = + (struct batman_packet *)forw_packet->skb->data; + int aggregated_bytes = forw_packet->packet_len + packet_len; + + /** + * we can aggregate the current packet to this aggregated packet + * if: + * + * - the send time is within our MAX_AGGREGATION_MS time + * - the resulting packet wont be bigger than + * MAX_AGGREGATION_BYTES + */ + + if (time_before(send_time, forw_packet->send_time) && + time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS), + forw_packet->send_time) && + (aggregated_bytes <= MAX_AGGREGATION_BYTES)) { + + /** + * check aggregation compatibility + * -> direct link packets are broadcasted on + * their interface only + * -> aggregate packet if the current packet is + * a "global" packet as well as the base + * packet + */ + + /* packets without direct link flag and high TTL + * are flooded through the net */ + if ((!directlink) && + (!(batman_packet->flags & DIRECTLINK)) && + (batman_packet->ttl != 1) && + + /* own packets originating non-primary + * interfaces leave only that interface */ + ((!forw_packet->own) || + (forw_packet->if_incoming->if_num == 0))) + return true; + + /* if the incoming packet is sent via this one + * interface only - we still can aggregate */ + if ((directlink) && + (new_batman_packet->ttl == 1) && + (forw_packet->if_incoming == if_incoming) && + + /* packets from direct neighbors or + * own secondary interface packets + * (= secondary interface packets in general) */ + (batman_packet->flags & DIRECTLINK || + (forw_packet->own && + forw_packet->if_incoming->if_num != 0))) + return true; + } + + return false; +} + +#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0) +/* create a new aggregated packet and add this packet to it */ +static void new_aggregated_packet(unsigned char *packet_buff, int packet_len, + unsigned long send_time, bool direct_link, + struct batman_if *if_incoming, + int own_packet) +{ + struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct forw_packet *forw_packet_aggr; + unsigned char *skb_buff; + + /* own packet should always be scheduled */ + if (!own_packet) { + if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) { + bat_dbg(DBG_BATMAN, bat_priv, + "batman packet queue full\n"); + return; + } + } + + forw_packet_aggr = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC); + if (!forw_packet_aggr) { + if (!own_packet) + atomic_inc(&bat_priv->batman_queue_left); + return; + } + + if ((atomic_read(&bat_priv->aggregated_ogms)) && + (packet_len < MAX_AGGREGATION_BYTES)) + forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES + + sizeof(struct ethhdr)); + else + forw_packet_aggr->skb = dev_alloc_skb(packet_len + + sizeof(struct ethhdr)); + + if (!forw_packet_aggr->skb) { + if (!own_packet) + atomic_inc(&bat_priv->batman_queue_left); + kfree(forw_packet_aggr); + return; + } + skb_reserve(forw_packet_aggr->skb, sizeof(struct ethhdr)); + + INIT_HLIST_NODE(&forw_packet_aggr->list); + + skb_buff = skb_put(forw_packet_aggr->skb, packet_len); + forw_packet_aggr->packet_len = packet_len; + memcpy(skb_buff, packet_buff, packet_len); + + forw_packet_aggr->own = own_packet; + forw_packet_aggr->if_incoming = if_incoming; + forw_packet_aggr->num_packets = 0; + forw_packet_aggr->direct_link_flags = 0; + forw_packet_aggr->send_time = send_time; + + /* save packet direct link flag status */ + if (direct_link) + forw_packet_aggr->direct_link_flags |= 1; + + /* add new packet to packet list */ + spin_lock_bh(&bat_priv->forw_bat_list_lock); + hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); + spin_unlock_bh(&bat_priv->forw_bat_list_lock); + + /* start timer for this packet */ + INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, + send_outstanding_bat_packet); + queue_delayed_work(bat_event_workqueue, + &forw_packet_aggr->delayed_work, + send_time - jiffies); +} + +/* aggregate a new packet into the existing aggregation */ +static void aggregate(struct forw_packet *forw_packet_aggr, + unsigned char *packet_buff, + int packet_len, + bool direct_link) +{ + unsigned char *skb_buff; + + skb_buff = skb_put(forw_packet_aggr->skb, packet_len); + memcpy(skb_buff, packet_buff, packet_len); + forw_packet_aggr->packet_len += packet_len; + forw_packet_aggr->num_packets++; + + /* save packet direct link flag status */ + if (direct_link) + forw_packet_aggr->direct_link_flags |= + (1 << forw_packet_aggr->num_packets); +} + +void add_bat_packet_to_list(struct bat_priv *bat_priv, + unsigned char *packet_buff, int packet_len, + struct batman_if *if_incoming, char own_packet, + unsigned long send_time) +{ + /** + * _aggr -> pointer to the packet we want to aggregate with + * _pos -> pointer to the position in the queue + */ + struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL; + struct hlist_node *tmp_node; + struct batman_packet *batman_packet = + (struct batman_packet *)packet_buff; + bool direct_link = batman_packet->flags & DIRECTLINK ? 1 : 0; + + /* find position for the packet in the forward queue */ + spin_lock_bh(&bat_priv->forw_bat_list_lock); + /* own packets are not to be aggregated */ + if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { + hlist_for_each_entry(forw_packet_pos, tmp_node, + &bat_priv->forw_bat_list, list) { + if (can_aggregate_with(batman_packet, + packet_len, + send_time, + direct_link, + if_incoming, + forw_packet_pos)) { + forw_packet_aggr = forw_packet_pos; + break; + } + } + } + + /* nothing to aggregate with - either aggregation disabled or no + * suitable aggregation packet found */ + if (!forw_packet_aggr) { + /* the following section can run without the lock */ + spin_unlock_bh(&bat_priv->forw_bat_list_lock); + + /** + * if we could not aggregate this packet with one of the others + * we hold it back for a while, so that it might be aggregated + * later on + */ + if ((!own_packet) && + (atomic_read(&bat_priv->aggregated_ogms))) + send_time += msecs_to_jiffies(MAX_AGGREGATION_MS); + + new_aggregated_packet(packet_buff, packet_len, + send_time, direct_link, + if_incoming, own_packet); + } else { + aggregate(forw_packet_aggr, + packet_buff, packet_len, + direct_link); + spin_unlock_bh(&bat_priv->forw_bat_list_lock); + } +} + +/* unpack the aggregated packets and process them one by one */ +void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff, + int packet_len, struct batman_if *if_incoming) +{ + struct batman_packet *batman_packet; + int buff_pos = 0; + unsigned char *hna_buff; + + batman_packet = (struct batman_packet *)packet_buff; + + do { + /* network to host order for our 32bit seqno, and the + orig_interval. */ + batman_packet->seqno = ntohl(batman_packet->seqno); + + hna_buff = packet_buff + buff_pos + BAT_PACKET_LEN; + receive_bat_packet(ethhdr, batman_packet, + hna_buff, hna_len(batman_packet), + if_incoming); + + buff_pos += BAT_PACKET_LEN + hna_len(batman_packet); + batman_packet = (struct batman_packet *) + (packet_buff + buff_pos); + } while (aggregated_packet(buff_pos, packet_len, + batman_packet->num_hna)); +} diff --git a/net/batman-adv/aggregation.h b/net/batman-adv/aggregation.h new file mode 100644 index 0000000..71a91b3 --- /dev/null +++ b/net/batman-adv/aggregation.h @@ -0,0 +1,43 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_AGGREGATION_H_ +#define _NET_BATMAN_ADV_AGGREGATION_H_ + +#include "main.h" + +/* is there another aggregated packet here? */ +static inline int aggregated_packet(int buff_pos, int packet_len, int num_hna) +{ + int next_buff_pos = buff_pos + BAT_PACKET_LEN + (num_hna * ETH_ALEN); + + return (next_buff_pos <= packet_len) && + (next_buff_pos <= MAX_AGGREGATION_BYTES); +} + +void add_bat_packet_to_list(struct bat_priv *bat_priv, + unsigned char *packet_buff, int packet_len, + struct batman_if *if_incoming, char own_packet, + unsigned long send_time); +void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff, + int packet_len, struct batman_if *if_incoming); + +#endif /* _NET_BATMAN_ADV_AGGREGATION_H_ */ diff --git a/net/batman-adv/bat_debugfs.c b/net/batman-adv/bat_debugfs.c new file mode 100644 index 0000000..0ae81d0 --- /dev/null +++ b/net/batman-adv/bat_debugfs.c @@ -0,0 +1,360 @@ +/* + * Copyright (C) 2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" + +#include <linux/debugfs.h> + +#include "bat_debugfs.h" +#include "translation-table.h" +#include "originator.h" +#include "hard-interface.h" +#include "gateway_common.h" +#include "gateway_client.h" +#include "soft-interface.h" +#include "vis.h" +#include "icmp_socket.h" + +static struct dentry *bat_debugfs; + +#ifdef CONFIG_BATMAN_ADV_DEBUG +#define LOG_BUFF_MASK (log_buff_len-1) +#define LOG_BUFF(idx) (debug_log->log_buff[(idx) & LOG_BUFF_MASK]) + +static int log_buff_len = LOG_BUF_LEN; + +static void emit_log_char(struct debug_log *debug_log, char c) +{ + LOG_BUFF(debug_log->log_end) = c; + debug_log->log_end++; + + if (debug_log->log_end - debug_log->log_start > log_buff_len) + debug_log->log_start = debug_log->log_end - log_buff_len; +} + +static int fdebug_log(struct debug_log *debug_log, char *fmt, ...) +{ + int printed_len; + va_list args; + static char debug_log_buf[256]; + char *p; + + if (!debug_log) + return 0; + + spin_lock_bh(&debug_log->lock); + va_start(args, fmt); + printed_len = vscnprintf(debug_log_buf, sizeof(debug_log_buf), + fmt, args); + va_end(args); + + for (p = debug_log_buf; *p != 0; p++) + emit_log_char(debug_log, *p); + + spin_unlock_bh(&debug_log->lock); + + wake_up(&debug_log->queue_wait); + + return 0; +} + +int debug_log(struct bat_priv *bat_priv, char *fmt, ...) +{ + va_list args; + char tmp_log_buf[256]; + + va_start(args, fmt); + vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args); + fdebug_log(bat_priv->debug_log, "[%10u] %s", + (jiffies / HZ), tmp_log_buf); + va_end(args); + + return 0; +} + +static int log_open(struct inode *inode, struct file *file) +{ + nonseekable_open(inode, file); + file->private_data = inode->i_private; + inc_module_count(); + return 0; +} + +static int log_release(struct inode *inode, struct file *file) +{ + dec_module_count(); + return 0; +} + +static ssize_t log_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct bat_priv *bat_priv = file->private_data; + struct debug_log *debug_log = bat_priv->debug_log; + int error, i = 0; + char c; + + if ((file->f_flags & O_NONBLOCK) && + !(debug_log->log_end - debug_log->log_start)) + return -EAGAIN; + + if ((!buf) || (count < 0)) + return -EINVAL; + + if (count == 0) + return 0; + + if (!access_ok(VERIFY_WRITE, buf, count)) + return -EFAULT; + + error = wait_event_interruptible(debug_log->queue_wait, + (debug_log->log_start - debug_log->log_end)); + + if (error) + return error; + + spin_lock_bh(&debug_log->lock); + + while ((!error) && (i < count) && + (debug_log->log_start != debug_log->log_end)) { + c = LOG_BUFF(debug_log->log_start); + + debug_log->log_start++; + + spin_unlock_bh(&debug_log->lock); + + error = __put_user(c, buf); + + spin_lock_bh(&debug_log->lock); + + buf++; + i++; + + } + + spin_unlock_bh(&debug_log->lock); + + if (!error) + return i; + + return error; +} + +static unsigned int log_poll(struct file *file, poll_table *wait) +{ + struct bat_priv *bat_priv = file->private_data; + struct debug_log *debug_log = bat_priv->debug_log; + + poll_wait(file, &debug_log->queue_wait, wait); + + if (debug_log->log_end - debug_log->log_start) + return POLLIN | POLLRDNORM; + + return 0; +} + +static const struct file_operations log_fops = { + .open = log_open, + .release = log_release, + .read = log_read, + .poll = log_poll, + .llseek = no_llseek, +}; + +static int debug_log_setup(struct bat_priv *bat_priv) +{ + struct dentry *d; + + if (!bat_priv->debug_dir) + goto err; + + bat_priv->debug_log = kzalloc(sizeof(struct debug_log), GFP_ATOMIC); + if (!bat_priv->debug_log) + goto err; + + spin_lock_init(&bat_priv->debug_log->lock); + init_waitqueue_head(&bat_priv->debug_log->queue_wait); + + d = debugfs_create_file("log", S_IFREG | S_IRUSR, + bat_priv->debug_dir, bat_priv, &log_fops); + if (d) + goto err; + + return 0; + +err: + return 1; +} + +static void debug_log_cleanup(struct bat_priv *bat_priv) +{ + kfree(bat_priv->debug_log); + bat_priv->debug_log = NULL; +} +#else /* CONFIG_BATMAN_ADV_DEBUG */ +static int debug_log_setup(struct bat_priv *bat_priv) +{ + bat_priv->debug_log = NULL; + return 0; +} + +static void debug_log_cleanup(struct bat_priv *bat_priv) +{ + return; +} +#endif + +static int originators_open(struct inode *inode, struct file *file) +{ + struct net_device *net_dev = (struct net_device *)inode->i_private; + return single_open(file, orig_seq_print_text, net_dev); +} + +static int gateways_open(struct inode *inode, struct file *file) +{ + struct net_device *net_dev = (struct net_device *)inode->i_private; + return single_open(file, gw_client_seq_print_text, net_dev); +} + +static int softif_neigh_open(struct inode *inode, struct file *file) +{ + struct net_device *net_dev = (struct net_device *)inode->i_private; + return single_open(file, softif_neigh_seq_print_text, net_dev); +} + +static int transtable_global_open(struct inode *inode, struct file *file) +{ + struct net_device *net_dev = (struct net_device *)inode->i_private; + return single_open(file, hna_global_seq_print_text, net_dev); +} + +static int transtable_local_open(struct inode *inode, struct file *file) +{ + struct net_device *net_dev = (struct net_device *)inode->i_private; + return single_open(file, hna_local_seq_print_text, net_dev); +} + +static int vis_data_open(struct inode *inode, struct file *file) +{ + struct net_device *net_dev = (struct net_device *)inode->i_private; + return single_open(file, vis_seq_print_text, net_dev); +} + +struct bat_debuginfo { + struct attribute attr; + const struct file_operations fops; +}; + +#define BAT_DEBUGINFO(_name, _mode, _open) \ +struct bat_debuginfo bat_debuginfo_##_name = { \ + .attr = { .name = __stringify(_name), \ + .mode = _mode, }, \ + .fops = { .owner = THIS_MODULE, \ + .open = _open, \ + .read = seq_read, \ + .llseek = seq_lseek, \ + .release = single_release, \ + } \ +}; + +static BAT_DEBUGINFO(originators, S_IRUGO, originators_open); +static BAT_DEBUGINFO(gateways, S_IRUGO, gateways_open); +static BAT_DEBUGINFO(softif_neigh, S_IRUGO, softif_neigh_open); +static BAT_DEBUGINFO(transtable_global, S_IRUGO, transtable_global_open); +static BAT_DEBUGINFO(transtable_local, S_IRUGO, transtable_local_open); +static BAT_DEBUGINFO(vis_data, S_IRUGO, vis_data_open); + +static struct bat_debuginfo *mesh_debuginfos[] = { + &bat_debuginfo_originators, + &bat_debuginfo_gateways, + &bat_debuginfo_softif_neigh, + &bat_debuginfo_transtable_global, + &bat_debuginfo_transtable_local, + &bat_debuginfo_vis_data, + NULL, +}; + +void debugfs_init(void) +{ + bat_debugfs = debugfs_create_dir(DEBUGFS_BAT_SUBDIR, NULL); + if (bat_debugfs == ERR_PTR(-ENODEV)) + bat_debugfs = NULL; +} + +void debugfs_destroy(void) +{ + if (bat_debugfs) { + debugfs_remove_recursive(bat_debugfs); + bat_debugfs = NULL; + } +} + +int debugfs_add_meshif(struct net_device *dev) +{ + struct bat_priv *bat_priv = netdev_priv(dev); + struct bat_debuginfo **bat_debug; + struct dentry *file; + + if (!bat_debugfs) + goto out; + + bat_priv->debug_dir = debugfs_create_dir(dev->name, bat_debugfs); + if (!bat_priv->debug_dir) + goto out; + + bat_socket_setup(bat_priv); + debug_log_setup(bat_priv); + + for (bat_debug = mesh_debuginfos; *bat_debug; ++bat_debug) { + file = debugfs_create_file(((*bat_debug)->attr).name, + S_IFREG | ((*bat_debug)->attr).mode, + bat_priv->debug_dir, + dev, &(*bat_debug)->fops); + if (!file) { + bat_err(dev, "Can't add debugfs file: %s/%s\n", + dev->name, ((*bat_debug)->attr).name); + goto rem_attr; + } + } + + return 0; +rem_attr: + debugfs_remove_recursive(bat_priv->debug_dir); + bat_priv->debug_dir = NULL; +out: +#ifdef CONFIG_DEBUG_FS + return -ENOMEM; +#else + return 0; +#endif /* CONFIG_DEBUG_FS */ +} + +void debugfs_del_meshif(struct net_device *dev) +{ + struct bat_priv *bat_priv = netdev_priv(dev); + + debug_log_cleanup(bat_priv); + + if (bat_debugfs) { + debugfs_remove_recursive(bat_priv->debug_dir); + bat_priv->debug_dir = NULL; + } +} diff --git a/net/batman-adv/bat_debugfs.h b/net/batman-adv/bat_debugfs.h new file mode 100644 index 0000000..72df532 --- /dev/null +++ b/net/batman-adv/bat_debugfs.h @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + + +#ifndef _NET_BATMAN_ADV_DEBUGFS_H_ +#define _NET_BATMAN_ADV_DEBUGFS_H_ + +#define DEBUGFS_BAT_SUBDIR "batman_adv" + +void debugfs_init(void); +void debugfs_destroy(void); +int debugfs_add_meshif(struct net_device *dev); +void debugfs_del_meshif(struct net_device *dev); + +#endif /* _NET_BATMAN_ADV_DEBUGFS_H_ */ diff --git a/net/batman-adv/bat_sysfs.c b/net/batman-adv/bat_sysfs.c new file mode 100644 index 0000000..cd7bb51 --- /dev/null +++ b/net/batman-adv/bat_sysfs.c @@ -0,0 +1,593 @@ +/* + * Copyright (C) 2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "bat_sysfs.h" +#include "translation-table.h" +#include "originator.h" +#include "hard-interface.h" +#include "gateway_common.h" +#include "gateway_client.h" +#include "vis.h" + +#define to_dev(obj) container_of(obj, struct device, kobj) +#define kobj_to_netdev(obj) to_net_dev(to_dev(obj->parent)) +#define kobj_to_batpriv(obj) netdev_priv(kobj_to_netdev(obj)) + +/* Use this, if you have customized show and store functions */ +#define BAT_ATTR(_name, _mode, _show, _store) \ +struct bat_attribute bat_attr_##_name = { \ + .attr = {.name = __stringify(_name), \ + .mode = _mode }, \ + .show = _show, \ + .store = _store, \ +}; + +#define BAT_ATTR_STORE_BOOL(_name, _post_func) \ +ssize_t store_##_name(struct kobject *kobj, struct attribute *attr, \ + char *buff, size_t count) \ +{ \ + struct net_device *net_dev = kobj_to_netdev(kobj); \ + struct bat_priv *bat_priv = netdev_priv(net_dev); \ + return __store_bool_attr(buff, count, _post_func, attr, \ + &bat_priv->_name, net_dev); \ +} + +#define BAT_ATTR_SHOW_BOOL(_name) \ +ssize_t show_##_name(struct kobject *kobj, struct attribute *attr, \ + char *buff) \ +{ \ + struct bat_priv *bat_priv = kobj_to_batpriv(kobj); \ + return sprintf(buff, "%s\n", \ + atomic_read(&bat_priv->_name) == 0 ? \ + "disabled" : "enabled"); \ +} \ + +/* Use this, if you are going to turn a [name] in bat_priv on or off */ +#define BAT_ATTR_BOOL(_name, _mode, _post_func) \ + static BAT_ATTR_STORE_BOOL(_name, _post_func) \ + static BAT_ATTR_SHOW_BOOL(_name) \ + static BAT_ATTR(_name, _mode, show_##_name, store_##_name) + + +#define BAT_ATTR_STORE_UINT(_name, _min, _max, _post_func) \ +ssize_t store_##_name(struct kobject *kobj, struct attribute *attr, \ + char *buff, size_t count) \ +{ \ + struct net_device *net_dev = kobj_to_netdev(kobj); \ + struct bat_priv *bat_priv = netdev_priv(net_dev); \ + return __store_uint_attr(buff, count, _min, _max, _post_func, \ + attr, &bat_priv->_name, net_dev); \ +} + +#define BAT_ATTR_SHOW_UINT(_name) \ +ssize_t show_##_name(struct kobject *kobj, struct attribute *attr, \ + char *buff) \ +{ \ + struct bat_priv *bat_priv = kobj_to_batpriv(kobj); \ + return sprintf(buff, "%i\n", atomic_read(&bat_priv->_name)); \ +} \ + +/* Use this, if you are going to set [name] in bat_priv to unsigned integer + * values only */ +#define BAT_ATTR_UINT(_name, _mode, _min, _max, _post_func) \ + static BAT_ATTR_STORE_UINT(_name, _min, _max, _post_func) \ + static BAT_ATTR_SHOW_UINT(_name) \ + static BAT_ATTR(_name, _mode, show_##_name, store_##_name) + + +static int store_bool_attr(char *buff, size_t count, + struct net_device *net_dev, + char *attr_name, atomic_t *attr) +{ + int enabled = -1; + + if (buff[count - 1] == '\n') + buff[count - 1] = '\0'; + + if ((strncmp(buff, "1", 2) == 0) || + (strncmp(buff, "enable", 7) == 0) || + (strncmp(buff, "enabled", 8) == 0)) + enabled = 1; + + if ((strncmp(buff, "0", 2) == 0) || + (strncmp(buff, "disable", 8) == 0) || + (strncmp(buff, "disabled", 9) == 0)) + enabled = 0; + + if (enabled < 0) { + bat_info(net_dev, + "%s: Invalid parameter received: %s\n", + attr_name, buff); + return -EINVAL; + } + + if (atomic_read(attr) == enabled) + return count; + + bat_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name, + atomic_read(attr) == 1 ? "enabled" : "disabled", + enabled == 1 ? "enabled" : "disabled"); + + atomic_set(attr, (unsigned)enabled); + return count; +} + +static inline ssize_t __store_bool_attr(char *buff, size_t count, + void (*post_func)(struct net_device *), + struct attribute *attr, + atomic_t *attr_store, struct net_device *net_dev) +{ + int ret; + + ret = store_bool_attr(buff, count, net_dev, (char *)attr->name, + attr_store); + if (post_func && ret) + post_func(net_dev); + + return ret; +} + +static int store_uint_attr(char *buff, size_t count, + struct net_device *net_dev, char *attr_name, + unsigned int min, unsigned int max, atomic_t *attr) +{ + unsigned long uint_val; + int ret; + + ret = strict_strtoul(buff, 10, &uint_val); + if (ret) { + bat_info(net_dev, + "%s: Invalid parameter received: %s\n", + attr_name, buff); + return -EINVAL; + } + + if (uint_val < min) { + bat_info(net_dev, "%s: Value is too small: %lu min: %u\n", + attr_name, uint_val, min); + return -EINVAL; + } + + if (uint_val > max) { + bat_info(net_dev, "%s: Value is too big: %lu max: %u\n", + attr_name, uint_val, max); + return -EINVAL; + } + + if (atomic_read(attr) == uint_val) + return count; + + bat_info(net_dev, "%s: Changing from: %i to: %lu\n", + attr_name, atomic_read(attr), uint_val); + + atomic_set(attr, uint_val); + return count; +} + +static inline ssize_t __store_uint_attr(char *buff, size_t count, + int min, int max, + void (*post_func)(struct net_device *), + struct attribute *attr, + atomic_t *attr_store, struct net_device *net_dev) +{ + int ret; + + ret = store_uint_attr(buff, count, net_dev, (char *)attr->name, + min, max, attr_store); + if (post_func && ret) + post_func(net_dev); + + return ret; +} + +static ssize_t show_vis_mode(struct kobject *kobj, struct attribute *attr, + char *buff) +{ + struct bat_priv *bat_priv = kobj_to_batpriv(kobj); + int vis_mode = atomic_read(&bat_priv->vis_mode); + + return sprintf(buff, "%s\n", + vis_mode == VIS_TYPE_CLIENT_UPDATE ? + "client" : "server"); +} + +static ssize_t store_vis_mode(struct kobject *kobj, struct attribute *attr, + char *buff, size_t count) +{ + struct net_device *net_dev = kobj_to_netdev(kobj); + struct bat_priv *bat_priv = netdev_priv(net_dev); + unsigned long val; + int ret, vis_mode_tmp = -1; + + ret = strict_strtoul(buff, 10, &val); + + if (((count == 2) && (!ret) && (val == VIS_TYPE_CLIENT_UPDATE)) || + (strncmp(buff, "client", 6) == 0) || + (strncmp(buff, "off", 3) == 0)) + vis_mode_tmp = VIS_TYPE_CLIENT_UPDATE; + + if (((count == 2) && (!ret) && (val == VIS_TYPE_SERVER_SYNC)) || + (strncmp(buff, "server", 6) == 0)) + vis_mode_tmp = VIS_TYPE_SERVER_SYNC; + + if (vis_mode_tmp < 0) { + if (buff[count - 1] == '\n') + buff[count - 1] = '\0'; + + bat_info(net_dev, + "Invalid parameter for 'vis mode' setting received: " + "%s\n", buff); + return -EINVAL; + } + + if (atomic_read(&bat_priv->vis_mode) == vis_mode_tmp) + return count; + + bat_info(net_dev, "Changing vis mode from: %s to: %s\n", + atomic_read(&bat_priv->vis_mode) == VIS_TYPE_CLIENT_UPDATE ? + "client" : "server", vis_mode_tmp == VIS_TYPE_CLIENT_UPDATE ? + "client" : "server"); + + atomic_set(&bat_priv->vis_mode, (unsigned)vis_mode_tmp); + return count; +} + +static void post_gw_deselect(struct net_device *net_dev) +{ + struct bat_priv *bat_priv = netdev_priv(net_dev); + gw_deselect(bat_priv); +} + +static ssize_t show_gw_mode(struct kobject *kobj, struct attribute *attr, + char *buff) +{ + struct bat_priv *bat_priv = kobj_to_batpriv(kobj); + int bytes_written; + + switch (atomic_read(&bat_priv->gw_mode)) { + case GW_MODE_CLIENT: + bytes_written = sprintf(buff, "%s\n", GW_MODE_CLIENT_NAME); + break; + case GW_MODE_SERVER: + bytes_written = sprintf(buff, "%s\n", GW_MODE_SERVER_NAME); + break; + default: + bytes_written = sprintf(buff, "%s\n", GW_MODE_OFF_NAME); + break; + } + + return bytes_written; +} + +static ssize_t store_gw_mode(struct kobject *kobj, struct attribute *attr, + char *buff, size_t count) +{ + struct net_device *net_dev = kobj_to_netdev(kobj); + struct bat_priv *bat_priv = netdev_priv(net_dev); + char *curr_gw_mode_str; + int gw_mode_tmp = -1; + + if (buff[count - 1] == '\n') + buff[count - 1] = '\0'; + + if (strncmp(buff, GW_MODE_OFF_NAME, strlen(GW_MODE_OFF_NAME)) == 0) + gw_mode_tmp = GW_MODE_OFF; + + if (strncmp(buff, GW_MODE_CLIENT_NAME, + strlen(GW_MODE_CLIENT_NAME)) == 0) + gw_mode_tmp = GW_MODE_CLIENT; + + if (strncmp(buff, GW_MODE_SERVER_NAME, + strlen(GW_MODE_SERVER_NAME)) == 0) + gw_mode_tmp = GW_MODE_SERVER; + + if (gw_mode_tmp < 0) { + bat_info(net_dev, + "Invalid parameter for 'gw mode' setting received: " + "%s\n", buff); + return -EINVAL; + } + + if (atomic_read(&bat_priv->gw_mode) == gw_mode_tmp) + return count; + + switch (atomic_read(&bat_priv->gw_mode)) { + case GW_MODE_CLIENT: + curr_gw_mode_str = GW_MODE_CLIENT_NAME; + break; + case GW_MODE_SERVER: + curr_gw_mode_str = GW_MODE_SERVER_NAME; + break; + default: + curr_gw_mode_str = GW_MODE_OFF_NAME; + break; + } + + bat_info(net_dev, "Changing gw mode from: %s to: %s\n", + curr_gw_mode_str, buff); + + gw_deselect(bat_priv); + atomic_set(&bat_priv->gw_mode, (unsigned)gw_mode_tmp); + return count; +} + +static ssize_t show_gw_bwidth(struct kobject *kobj, struct attribute *attr, + char *buff) +{ + struct bat_priv *bat_priv = kobj_to_batpriv(kobj); + int down, up; + int gw_bandwidth = atomic_read(&bat_priv->gw_bandwidth); + + gw_bandwidth_to_kbit(gw_bandwidth, &down, &up); + return sprintf(buff, "%i%s/%i%s\n", + (down > 2048 ? down / 1024 : down), + (down > 2048 ? "MBit" : "KBit"), + (up > 2048 ? up / 1024 : up), + (up > 2048 ? "MBit" : "KBit")); +} + +static ssize_t store_gw_bwidth(struct kobject *kobj, struct attribute *attr, + char *buff, size_t count) +{ + struct net_device *net_dev = kobj_to_netdev(kobj); + + if (buff[count - 1] == '\n') + buff[count - 1] = '\0'; + + return gw_bandwidth_set(net_dev, buff, count); +} + +BAT_ATTR_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL); +BAT_ATTR_BOOL(bonding, S_IRUGO | S_IWUSR, NULL); +BAT_ATTR_BOOL(fragmentation, S_IRUGO | S_IWUSR, update_min_mtu); +static BAT_ATTR(vis_mode, S_IRUGO | S_IWUSR, show_vis_mode, store_vis_mode); +static BAT_ATTR(gw_mode, S_IRUGO | S_IWUSR, show_gw_mode, store_gw_mode); +BAT_ATTR_UINT(orig_interval, S_IRUGO | S_IWUSR, 2 * JITTER, INT_MAX, NULL); +BAT_ATTR_UINT(hop_penalty, S_IRUGO | S_IWUSR, 0, TQ_MAX_VALUE, NULL); +BAT_ATTR_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, TQ_MAX_VALUE, + post_gw_deselect); +static BAT_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, show_gw_bwidth, + store_gw_bwidth); +#ifdef CONFIG_BATMAN_ADV_DEBUG +BAT_ATTR_UINT(log_level, S_IRUGO | S_IWUSR, 0, 3, NULL); +#endif + +static struct bat_attribute *mesh_attrs[] = { + &bat_attr_aggregated_ogms, + &bat_attr_bonding, + &bat_attr_fragmentation, + &bat_attr_vis_mode, + &bat_attr_gw_mode, + &bat_attr_orig_interval, + &bat_attr_hop_penalty, + &bat_attr_gw_sel_class, + &bat_attr_gw_bandwidth, +#ifdef CONFIG_BATMAN_ADV_DEBUG + &bat_attr_log_level, +#endif + NULL, +}; + +int sysfs_add_meshif(struct net_device *dev) +{ + struct kobject *batif_kobject = &dev->dev.kobj; + struct bat_priv *bat_priv = netdev_priv(dev); + struct bat_attribute **bat_attr; + int err; + + bat_priv->mesh_obj = kobject_create_and_add(SYSFS_IF_MESH_SUBDIR, + batif_kobject); + if (!bat_priv->mesh_obj) { + bat_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name, + SYSFS_IF_MESH_SUBDIR); + goto out; + } + + for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr) { + err = sysfs_create_file(bat_priv->mesh_obj, + &((*bat_attr)->attr)); + if (err) { + bat_err(dev, "Can't add sysfs file: %s/%s/%s\n", + dev->name, SYSFS_IF_MESH_SUBDIR, + ((*bat_attr)->attr).name); + goto rem_attr; + } + } + + return 0; + +rem_attr: + for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr) + sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr)); + + kobject_put(bat_priv->mesh_obj); + bat_priv->mesh_obj = NULL; +out: + return -ENOMEM; +} + +void sysfs_del_meshif(struct net_device *dev) +{ + struct bat_priv *bat_priv = netdev_priv(dev); + struct bat_attribute **bat_attr; + + for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr) + sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr)); + + kobject_put(bat_priv->mesh_obj); + bat_priv->mesh_obj = NULL; +} + +static ssize_t show_mesh_iface(struct kobject *kobj, struct attribute *attr, + char *buff) +{ + struct net_device *net_dev = kobj_to_netdev(kobj); + struct batman_if *batman_if = get_batman_if_by_netdev(net_dev); + ssize_t length; + + if (!batman_if) + return 0; + + length = sprintf(buff, "%s\n", batman_if->if_status == IF_NOT_IN_USE ? + "none" : batman_if->soft_iface->name); + + kref_put(&batman_if->refcount, hardif_free_ref); + + return length; +} + +static ssize_t store_mesh_iface(struct kobject *kobj, struct attribute *attr, + char *buff, size_t count) +{ + struct net_device *net_dev = kobj_to_netdev(kobj); + struct batman_if *batman_if = get_batman_if_by_netdev(net_dev); + int status_tmp = -1; + int ret; + + if (!batman_if) + return count; + + if (buff[count - 1] == '\n') + buff[count - 1] = '\0'; + + if (strlen(buff) >= IFNAMSIZ) { + pr_err("Invalid parameter for 'mesh_iface' setting received: " + "interface name too long '%s'\n", buff); + kref_put(&batman_if->refcount, hardif_free_ref); + return -EINVAL; + } + + if (strncmp(buff, "none", 4) == 0) + status_tmp = IF_NOT_IN_USE; + else + status_tmp = IF_I_WANT_YOU; + + if ((batman_if->if_status == status_tmp) || ((batman_if->soft_iface) && + (strncmp(batman_if->soft_iface->name, buff, IFNAMSIZ) == 0))) { + kref_put(&batman_if->refcount, hardif_free_ref); + return count; + } + + if (status_tmp == IF_NOT_IN_USE) { + rtnl_lock(); + hardif_disable_interface(batman_if); + rtnl_unlock(); + kref_put(&batman_if->refcount, hardif_free_ref); + return count; + } + + /* if the interface already is in use */ + if (batman_if->if_status != IF_NOT_IN_USE) { + rtnl_lock(); + hardif_disable_interface(batman_if); + rtnl_unlock(); + } + + ret = hardif_enable_interface(batman_if, buff); + kref_put(&batman_if->refcount, hardif_free_ref); + + return ret; +} + +static ssize_t show_iface_status(struct kobject *kobj, struct attribute *attr, + char *buff) +{ + struct net_device *net_dev = kobj_to_netdev(kobj); + struct batman_if *batman_if = get_batman_if_by_netdev(net_dev); + ssize_t length; + + if (!batman_if) + return 0; + + switch (batman_if->if_status) { + case IF_TO_BE_REMOVED: + length = sprintf(buff, "disabling\n"); + break; + case IF_INACTIVE: + length = sprintf(buff, "inactive\n"); + break; + case IF_ACTIVE: + length = sprintf(buff, "active\n"); + break; + case IF_TO_BE_ACTIVATED: + length = sprintf(buff, "enabling\n"); + break; + case IF_NOT_IN_USE: + default: + length = sprintf(buff, "not in use\n"); + break; + } + + kref_put(&batman_if->refcount, hardif_free_ref); + + return length; +} + +static BAT_ATTR(mesh_iface, S_IRUGO | S_IWUSR, + show_mesh_iface, store_mesh_iface); +static BAT_ATTR(iface_status, S_IRUGO, show_iface_status, NULL); + +static struct bat_attribute *batman_attrs[] = { + &bat_attr_mesh_iface, + &bat_attr_iface_status, + NULL, +}; + +int sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev) +{ + struct kobject *hardif_kobject = &dev->dev.kobj; + struct bat_attribute **bat_attr; + int err; + + *hardif_obj = kobject_create_and_add(SYSFS_IF_BAT_SUBDIR, + hardif_kobject); + + if (!*hardif_obj) { + bat_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name, + SYSFS_IF_BAT_SUBDIR); + goto out; + } + + for (bat_attr = batman_attrs; *bat_attr; ++bat_attr) { + err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr)); + if (err) { + bat_err(dev, "Can't add sysfs file: %s/%s/%s\n", + dev->name, SYSFS_IF_BAT_SUBDIR, + ((*bat_attr)->attr).name); + goto rem_attr; + } + } + + return 0; + +rem_attr: + for (bat_attr = batman_attrs; *bat_attr; ++bat_attr) + sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr)); +out: + return -ENOMEM; +} + +void sysfs_del_hardif(struct kobject **hardif_obj) +{ + kobject_put(*hardif_obj); + *hardif_obj = NULL; +} diff --git a/net/batman-adv/bat_sysfs.h b/net/batman-adv/bat_sysfs.h new file mode 100644 index 0000000..7f186c0 --- /dev/null +++ b/net/batman-adv/bat_sysfs.h @@ -0,0 +1,42 @@ +/* + * Copyright (C) 2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + + +#ifndef _NET_BATMAN_ADV_SYSFS_H_ +#define _NET_BATMAN_ADV_SYSFS_H_ + +#define SYSFS_IF_MESH_SUBDIR "mesh" +#define SYSFS_IF_BAT_SUBDIR "batman_adv" + +struct bat_attribute { + struct attribute attr; + ssize_t (*show)(struct kobject *kobj, struct attribute *attr, + char *buf); + ssize_t (*store)(struct kobject *kobj, struct attribute *attr, + char *buf, size_t count); +}; + +int sysfs_add_meshif(struct net_device *dev); +void sysfs_del_meshif(struct net_device *dev); +int sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev); +void sysfs_del_hardif(struct kobject **hardif_obj); + +#endif /* _NET_BATMAN_ADV_SYSFS_H_ */ diff --git a/net/batman-adv/bitarray.c b/net/batman-adv/bitarray.c new file mode 100644 index 0000000..bbcd8f7 --- /dev/null +++ b/net/batman-adv/bitarray.c @@ -0,0 +1,201 @@ +/* + * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors: + * + * Simon Wunderlich, Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "bitarray.h" + +#include <linux/bitops.h> + +/* returns true if the corresponding bit in the given seq_bits indicates true + * and curr_seqno is within range of last_seqno */ +uint8_t get_bit_status(unsigned long *seq_bits, uint32_t last_seqno, + uint32_t curr_seqno) +{ + int32_t diff, word_offset, word_num; + + diff = last_seqno - curr_seqno; + if (diff < 0 || diff >= TQ_LOCAL_WINDOW_SIZE) { + return 0; + } else { + /* which word */ + word_num = (last_seqno - curr_seqno) / WORD_BIT_SIZE; + /* which position in the selected word */ + word_offset = (last_seqno - curr_seqno) % WORD_BIT_SIZE; + + if (test_bit(word_offset, &seq_bits[word_num])) + return 1; + else + return 0; + } +} + +/* turn corresponding bit on, so we can remember that we got the packet */ +void bit_mark(unsigned long *seq_bits, int32_t n) +{ + int32_t word_offset, word_num; + + /* if too old, just drop it */ + if (n < 0 || n >= TQ_LOCAL_WINDOW_SIZE) + return; + + /* which word */ + word_num = n / WORD_BIT_SIZE; + /* which position in the selected word */ + word_offset = n % WORD_BIT_SIZE; + + set_bit(word_offset, &seq_bits[word_num]); /* turn the position on */ +} + +/* shift the packet array by n places. */ +static void bit_shift(unsigned long *seq_bits, int32_t n) +{ + int32_t word_offset, word_num; + int32_t i; + + if (n <= 0 || n >= TQ_LOCAL_WINDOW_SIZE) + return; + + word_offset = n % WORD_BIT_SIZE;/* shift how much inside each word */ + word_num = n / WORD_BIT_SIZE; /* shift over how much (full) words */ + + for (i = NUM_WORDS - 1; i > word_num; i--) { + /* going from old to new, so we don't overwrite the data we copy + * from. + * + * left is high, right is low: FEDC BA98 7654 3210 + * ^^ ^^ + * vvvv + * ^^^^ = from, vvvvv =to, we'd have word_num==1 and + * word_offset==WORD_BIT_SIZE/2 ????? in this example. + * (=24 bits) + * + * our desired output would be: 9876 5432 1000 0000 + * */ + + seq_bits[i] = + (seq_bits[i - word_num] << word_offset) + + /* take the lower port from the left half, shift it left + * to its final position */ + (seq_bits[i - word_num - 1] >> + (WORD_BIT_SIZE-word_offset)); + /* and the upper part of the right half and shift it left to + * it's position */ + /* for our example that would be: word[0] = 9800 + 0076 = + * 9876 */ + } + /* now for our last word, i==word_num, we only have the it's "left" + * half. that's the 1000 word in our example.*/ + + seq_bits[i] = (seq_bits[i - word_num] << word_offset); + + /* pad the rest with 0, if there is anything */ + i--; + + for (; i >= 0; i--) + seq_bits[i] = 0; +} + +static void bit_reset_window(unsigned long *seq_bits) +{ + int i; + for (i = 0; i < NUM_WORDS; i++) + seq_bits[i] = 0; +} + + +/* receive and process one packet within the sequence number window. + * + * returns: + * 1 if the window was moved (either new or very old) + * 0 if the window was not moved/shifted. + */ +char bit_get_packet(void *priv, unsigned long *seq_bits, + int32_t seq_num_diff, int8_t set_mark) +{ + struct bat_priv *bat_priv = (struct bat_priv *)priv; + + /* sequence number is slightly older. We already got a sequence number + * higher than this one, so we just mark it. */ + + if ((seq_num_diff <= 0) && (seq_num_diff > -TQ_LOCAL_WINDOW_SIZE)) { + if (set_mark) + bit_mark(seq_bits, -seq_num_diff); + return 0; + } + + /* sequence number is slightly newer, so we shift the window and + * set the mark if required */ + + if ((seq_num_diff > 0) && (seq_num_diff < TQ_LOCAL_WINDOW_SIZE)) { + bit_shift(seq_bits, seq_num_diff); + + if (set_mark) + bit_mark(seq_bits, 0); + return 1; + } + + /* sequence number is much newer, probably missed a lot of packets */ + + if ((seq_num_diff >= TQ_LOCAL_WINDOW_SIZE) + || (seq_num_diff < EXPECTED_SEQNO_RANGE)) { + bat_dbg(DBG_BATMAN, bat_priv, + "We missed a lot of packets (%i) !\n", + seq_num_diff - 1); + bit_reset_window(seq_bits); + if (set_mark) + bit_mark(seq_bits, 0); + return 1; + } + + /* received a much older packet. The other host either restarted + * or the old packet got delayed somewhere in the network. The + * packet should be dropped without calling this function if the + * seqno window is protected. */ + + if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) + || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { + + bat_dbg(DBG_BATMAN, bat_priv, + "Other host probably restarted!\n"); + + bit_reset_window(seq_bits); + if (set_mark) + bit_mark(seq_bits, 0); + + return 1; + } + + /* never reached */ + return 0; +} + +/* count the hamming weight, how many good packets did we receive? just count + * the 1's. + */ +int bit_packet_count(unsigned long *seq_bits) +{ + int i, hamming = 0; + + for (i = 0; i < NUM_WORDS; i++) + hamming += hweight_long(seq_bits[i]); + + return hamming; +} diff --git a/net/batman-adv/bitarray.h b/net/batman-adv/bitarray.h new file mode 100644 index 0000000..ac54017 --- /dev/null +++ b/net/batman-adv/bitarray.h @@ -0,0 +1,44 @@ +/* + * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors: + * + * Simon Wunderlich, Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_BITARRAY_H_ +#define _NET_BATMAN_ADV_BITARRAY_H_ + +#define WORD_BIT_SIZE (sizeof(unsigned long) * 8) + +/* returns true if the corresponding bit in the given seq_bits indicates true + * and curr_seqno is within range of last_seqno */ +uint8_t get_bit_status(unsigned long *seq_bits, uint32_t last_seqno, + uint32_t curr_seqno); + +/* turn corresponding bit on, so we can remember that we got the packet */ +void bit_mark(unsigned long *seq_bits, int32_t n); + + +/* receive and process one packet, returns 1 if received seq_num is considered + * new, 0 if old */ +char bit_get_packet(void *priv, unsigned long *seq_bits, + int32_t seq_num_diff, int8_t set_mark); + +/* count the hamming weight, how many good packets did we receive? */ +int bit_packet_count(unsigned long *seq_bits); + +#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */ diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c new file mode 100644 index 0000000..0065ffb --- /dev/null +++ b/net/batman-adv/gateway_client.c @@ -0,0 +1,477 @@ +/* + * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "gateway_client.h" +#include "gateway_common.h" +#include "hard-interface.h" +#include <linux/ip.h> +#include <linux/ipv6.h> +#include <linux/udp.h> +#include <linux/if_vlan.h> + +static void gw_node_free_ref(struct kref *refcount) +{ + struct gw_node *gw_node; + + gw_node = container_of(refcount, struct gw_node, refcount); + kfree(gw_node); +} + +static void gw_node_free_rcu(struct rcu_head *rcu) +{ + struct gw_node *gw_node; + + gw_node = container_of(rcu, struct gw_node, rcu); + kref_put(&gw_node->refcount, gw_node_free_ref); +} + +void *gw_get_selected(struct bat_priv *bat_priv) +{ + struct gw_node *curr_gateway_tmp = bat_priv->curr_gw; + + if (!curr_gateway_tmp) + return NULL; + + return curr_gateway_tmp->orig_node; +} + +void gw_deselect(struct bat_priv *bat_priv) +{ + struct gw_node *gw_node = bat_priv->curr_gw; + + bat_priv->curr_gw = NULL; + + if (gw_node) + kref_put(&gw_node->refcount, gw_node_free_ref); +} + +static struct gw_node *gw_select(struct bat_priv *bat_priv, + struct gw_node *new_gw_node) +{ + struct gw_node *curr_gw_node = bat_priv->curr_gw; + + if (new_gw_node) + kref_get(&new_gw_node->refcount); + + bat_priv->curr_gw = new_gw_node; + return curr_gw_node; +} + +void gw_election(struct bat_priv *bat_priv) +{ + struct hlist_node *node; + struct gw_node *gw_node, *curr_gw_tmp = NULL, *old_gw_node = NULL; + uint8_t max_tq = 0; + uint32_t max_gw_factor = 0, tmp_gw_factor = 0; + int down, up; + + /** + * The batman daemon checks here if we already passed a full originator + * cycle in order to make sure we don't choose the first gateway we + * hear about. This check is based on the daemon's uptime which we + * don't have. + **/ + if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT) + return; + + if (bat_priv->curr_gw) + return; + + rcu_read_lock(); + if (hlist_empty(&bat_priv->gw_list)) { + rcu_read_unlock(); + + if (bat_priv->curr_gw) { + bat_dbg(DBG_BATMAN, bat_priv, + "Removing selected gateway - " + "no gateway in range\n"); + gw_deselect(bat_priv); + } + + return; + } + + hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { + if (!gw_node->orig_node->router) + continue; + + if (gw_node->deleted) + continue; + + switch (atomic_read(&bat_priv->gw_sel_class)) { + case 1: /* fast connection */ + gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, + &down, &up); + + tmp_gw_factor = (gw_node->orig_node->router->tq_avg * + gw_node->orig_node->router->tq_avg * + down * 100 * 100) / + (TQ_LOCAL_WINDOW_SIZE * + TQ_LOCAL_WINDOW_SIZE * 64); + + if ((tmp_gw_factor > max_gw_factor) || + ((tmp_gw_factor == max_gw_factor) && + (gw_node->orig_node->router->tq_avg > max_tq))) + curr_gw_tmp = gw_node; + break; + + default: /** + * 2: stable connection (use best statistic) + * 3: fast-switch (use best statistic but change as + * soon as a better gateway appears) + * XX: late-switch (use best statistic but change as + * soon as a better gateway appears which has + * $routing_class more tq points) + **/ + if (gw_node->orig_node->router->tq_avg > max_tq) + curr_gw_tmp = gw_node; + break; + } + + if (gw_node->orig_node->router->tq_avg > max_tq) + max_tq = gw_node->orig_node->router->tq_avg; + + if (tmp_gw_factor > max_gw_factor) + max_gw_factor = tmp_gw_factor; + } + + if (bat_priv->curr_gw != curr_gw_tmp) { + if ((bat_priv->curr_gw) && (!curr_gw_tmp)) + bat_dbg(DBG_BATMAN, bat_priv, + "Removing selected gateway - " + "no gateway in range\n"); + else if ((!bat_priv->curr_gw) && (curr_gw_tmp)) + bat_dbg(DBG_BATMAN, bat_priv, + "Adding route to gateway %pM " + "(gw_flags: %i, tq: %i)\n", + curr_gw_tmp->orig_node->orig, + curr_gw_tmp->orig_node->gw_flags, + curr_gw_tmp->orig_node->router->tq_avg); + else + bat_dbg(DBG_BATMAN, bat_priv, + "Changing route to gateway %pM " + "(gw_flags: %i, tq: %i)\n", + curr_gw_tmp->orig_node->orig, + curr_gw_tmp->orig_node->gw_flags, + curr_gw_tmp->orig_node->router->tq_avg); + + old_gw_node = gw_select(bat_priv, curr_gw_tmp); + } + + rcu_read_unlock(); + + /* the kfree() has to be outside of the rcu lock */ + if (old_gw_node) + kref_put(&old_gw_node->refcount, gw_node_free_ref); +} + +void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node) +{ + struct gw_node *curr_gateway_tmp = bat_priv->curr_gw; + uint8_t gw_tq_avg, orig_tq_avg; + + if (!curr_gateway_tmp) + return; + + if (!curr_gateway_tmp->orig_node) + goto deselect; + + if (!curr_gateway_tmp->orig_node->router) + goto deselect; + + /* this node already is the gateway */ + if (curr_gateway_tmp->orig_node == orig_node) + return; + + if (!orig_node->router) + return; + + gw_tq_avg = curr_gateway_tmp->orig_node->router->tq_avg; + orig_tq_avg = orig_node->router->tq_avg; + + /* the TQ value has to be better */ + if (orig_tq_avg < gw_tq_avg) + return; + + /** + * if the routing class is greater than 3 the value tells us how much + * greater the TQ value of the new gateway must be + **/ + if ((atomic_read(&bat_priv->gw_sel_class) > 3) && + (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) + return; + + bat_dbg(DBG_BATMAN, bat_priv, + "Restarting gateway selection: better gateway found (tq curr: " + "%i, tq new: %i)\n", + gw_tq_avg, orig_tq_avg); + +deselect: + gw_deselect(bat_priv); +} + +static void gw_node_add(struct bat_priv *bat_priv, + struct orig_node *orig_node, uint8_t new_gwflags) +{ + struct gw_node *gw_node; + int down, up; + + gw_node = kmalloc(sizeof(struct gw_node), GFP_ATOMIC); + if (!gw_node) + return; + + memset(gw_node, 0, sizeof(struct gw_node)); + INIT_HLIST_NODE(&gw_node->list); + gw_node->orig_node = orig_node; + kref_init(&gw_node->refcount); + + spin_lock_bh(&bat_priv->gw_list_lock); + hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list); + spin_unlock_bh(&bat_priv->gw_list_lock); + + gw_bandwidth_to_kbit(new_gwflags, &down, &up); + bat_dbg(DBG_BATMAN, bat_priv, + "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", + orig_node->orig, new_gwflags, + (down > 2048 ? down / 1024 : down), + (down > 2048 ? "MBit" : "KBit"), + (up > 2048 ? up / 1024 : up), + (up > 2048 ? "MBit" : "KBit")); +} + +void gw_node_update(struct bat_priv *bat_priv, + struct orig_node *orig_node, uint8_t new_gwflags) +{ + struct hlist_node *node; + struct gw_node *gw_node; + + rcu_read_lock(); + hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { + if (gw_node->orig_node != orig_node) + continue; + + bat_dbg(DBG_BATMAN, bat_priv, + "Gateway class of originator %pM changed from " + "%i to %i\n", + orig_node->orig, gw_node->orig_node->gw_flags, + new_gwflags); + + gw_node->deleted = 0; + + if (new_gwflags == 0) { + gw_node->deleted = jiffies; + bat_dbg(DBG_BATMAN, bat_priv, + "Gateway %pM removed from gateway list\n", + orig_node->orig); + + if (gw_node == bat_priv->curr_gw) { + rcu_read_unlock(); + gw_deselect(bat_priv); + return; + } + } + + rcu_read_unlock(); + return; + } + rcu_read_unlock(); + + if (new_gwflags == 0) + return; + + gw_node_add(bat_priv, orig_node, new_gwflags); +} + +void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node) +{ + return gw_node_update(bat_priv, orig_node, 0); +} + +void gw_node_purge(struct bat_priv *bat_priv) +{ + struct gw_node *gw_node; + struct hlist_node *node, *node_tmp; + unsigned long timeout = 2 * PURGE_TIMEOUT * HZ; + + spin_lock_bh(&bat_priv->gw_list_lock); + + hlist_for_each_entry_safe(gw_node, node, node_tmp, + &bat_priv->gw_list, list) { + if (((!gw_node->deleted) || + (time_before(jiffies, gw_node->deleted + timeout))) && + atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) + continue; + + if (bat_priv->curr_gw == gw_node) + gw_deselect(bat_priv); + + hlist_del_rcu(&gw_node->list); + call_rcu(&gw_node->rcu, gw_node_free_rcu); + } + + + spin_unlock_bh(&bat_priv->gw_list_lock); +} + +static int _write_buffer_text(struct bat_priv *bat_priv, + struct seq_file *seq, struct gw_node *gw_node) +{ + int down, up; + + gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); + + return seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n", + (bat_priv->curr_gw == gw_node ? "=>" : " "), + gw_node->orig_node->orig, + gw_node->orig_node->router->tq_avg, + gw_node->orig_node->router->addr, + gw_node->orig_node->router->if_incoming->net_dev->name, + gw_node->orig_node->gw_flags, + (down > 2048 ? down / 1024 : down), + (down > 2048 ? "MBit" : "KBit"), + (up > 2048 ? up / 1024 : up), + (up > 2048 ? "MBit" : "KBit")); +} + +int gw_client_seq_print_text(struct seq_file *seq, void *offset) +{ + struct net_device *net_dev = (struct net_device *)seq->private; + struct bat_priv *bat_priv = netdev_priv(net_dev); + struct gw_node *gw_node; + struct hlist_node *node; + int gw_count = 0; + + if (!bat_priv->primary_if) { + + return seq_printf(seq, "BATMAN mesh %s disabled - please " + "specify interfaces to enable it\n", + net_dev->name); + } + + if (bat_priv->primary_if->if_status != IF_ACTIVE) { + + return seq_printf(seq, "BATMAN mesh %s disabled - " + "primary interface not active\n", + net_dev->name); + } + + seq_printf(seq, " %-12s (%s/%i) %17s [%10s]: gw_class ... " + "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n", + "Gateway", "#", TQ_MAX_VALUE, "Nexthop", + "outgoingIF", SOURCE_VERSION, REVISION_VERSION_STR, + bat_priv->primary_if->net_dev->name, + bat_priv->primary_if->net_dev->dev_addr, net_dev->name); + + rcu_read_lock(); + hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { + if (gw_node->deleted) + continue; + + if (!gw_node->orig_node->router) + continue; + + _write_buffer_text(bat_priv, seq, gw_node); + gw_count++; + } + rcu_read_unlock(); + + if (gw_count == 0) + seq_printf(seq, "No gateways in range ...\n"); + + return 0; +} + +int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb) +{ + struct ethhdr *ethhdr; + struct iphdr *iphdr; + struct ipv6hdr *ipv6hdr; + struct udphdr *udphdr; + unsigned int header_len = 0; + + if (atomic_read(&bat_priv->gw_mode) == GW_MODE_OFF) + return 0; + + /* check for ethernet header */ + if (!pskb_may_pull(skb, header_len + ETH_HLEN)) + return 0; + ethhdr = (struct ethhdr *)skb->data; + header_len += ETH_HLEN; + + /* check for initial vlan header */ + if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { + if (!pskb_may_pull(skb, header_len + VLAN_HLEN)) + return 0; + ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); + header_len += VLAN_HLEN; + } + + /* check for ip header */ + switch (ntohs(ethhdr->h_proto)) { + case ETH_P_IP: + if (!pskb_may_pull(skb, header_len + sizeof(struct iphdr))) + return 0; + iphdr = (struct iphdr *)(skb->data + header_len); + header_len += iphdr->ihl * 4; + + /* check for udp header */ + if (iphdr->protocol != IPPROTO_UDP) + return 0; + + break; + case ETH_P_IPV6: + if (!pskb_may_pull(skb, header_len + sizeof(struct ipv6hdr))) + return 0; + ipv6hdr = (struct ipv6hdr *)(skb->data + header_len); + header_len += sizeof(struct ipv6hdr); + + /* check for udp header */ + if (ipv6hdr->nexthdr != IPPROTO_UDP) + return 0; + + break; + default: + return 0; + } + + if (!pskb_may_pull(skb, header_len + sizeof(struct udphdr))) + return 0; + udphdr = (struct udphdr *)(skb->data + header_len); + header_len += sizeof(struct udphdr); + + /* check for bootp port */ + if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && + (ntohs(udphdr->dest) != 67)) + return 0; + + if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && + (ntohs(udphdr->dest) != 547)) + return 0; + + if (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER) + return -1; + + if (!bat_priv->curr_gw) + return 0; + + return 1; +} diff --git a/net/batman-adv/gateway_client.h b/net/batman-adv/gateway_client.h new file mode 100644 index 0000000..4585e65 --- /dev/null +++ b/net/batman-adv/gateway_client.h @@ -0,0 +1,36 @@ +/* + * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_GATEWAY_CLIENT_H_ +#define _NET_BATMAN_ADV_GATEWAY_CLIENT_H_ + +void gw_deselect(struct bat_priv *bat_priv); +void gw_election(struct bat_priv *bat_priv); +void *gw_get_selected(struct bat_priv *bat_priv); +void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node); +void gw_node_update(struct bat_priv *bat_priv, + struct orig_node *orig_node, uint8_t new_gwflags); +void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node); +void gw_node_purge(struct bat_priv *bat_priv); +int gw_client_seq_print_text(struct seq_file *seq, void *offset); +int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb); + +#endif /* _NET_BATMAN_ADV_GATEWAY_CLIENT_H_ */ diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c new file mode 100644 index 0000000..b962982 --- /dev/null +++ b/net/batman-adv/gateway_common.c @@ -0,0 +1,177 @@ +/* + * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "gateway_common.h" +#include "gateway_client.h" + +/* calculates the gateway class from kbit */ +static void kbit_to_gw_bandwidth(int down, int up, long *gw_srv_class) +{ + int mdown = 0, tdown, tup, difference; + uint8_t sbit, part; + + *gw_srv_class = 0; + difference = 0x0FFFFFFF; + + /* test all downspeeds */ + for (sbit = 0; sbit < 2; sbit++) { + for (part = 0; part < 16; part++) { + tdown = 32 * (sbit + 2) * (1 << part); + + if (abs(tdown - down) < difference) { + *gw_srv_class = (sbit << 7) + (part << 3); + difference = abs(tdown - down); + mdown = tdown; + } + } + } + + /* test all upspeeds */ + difference = 0x0FFFFFFF; + + for (part = 0; part < 8; part++) { + tup = ((part + 1) * (mdown)) / 8; + + if (abs(tup - up) < difference) { + *gw_srv_class = (*gw_srv_class & 0xF8) | part; + difference = abs(tup - up); + } + } +} + +/* returns the up and downspeeds in kbit, calculated from the class */ +void gw_bandwidth_to_kbit(uint8_t gw_srv_class, int *down, int *up) +{ + char sbit = (gw_srv_class & 0x80) >> 7; + char dpart = (gw_srv_class & 0x78) >> 3; + char upart = (gw_srv_class & 0x07); + + if (!gw_srv_class) { + *down = 0; + *up = 0; + return; + } + + *down = 32 * (sbit + 2) * (1 << dpart); + *up = ((upart + 1) * (*down)) / 8; +} + +static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff, + long *up, long *down) +{ + int ret, multi = 1; + char *slash_ptr, *tmp_ptr; + + slash_ptr = strchr(buff, '/'); + if (slash_ptr) + *slash_ptr = 0; + + if (strlen(buff) > 4) { + tmp_ptr = buff + strlen(buff) - 4; + + if (strnicmp(tmp_ptr, "mbit", 4) == 0) + multi = 1024; + + if ((strnicmp(tmp_ptr, "kbit", 4) == 0) || + (multi > 1)) + *tmp_ptr = '\0'; + } + + ret = strict_strtoul(buff, 10, down); + if (ret) { + bat_err(net_dev, + "Download speed of gateway mode invalid: %s\n", + buff); + return false; + } + + *down *= multi; + + /* we also got some upload info */ + if (slash_ptr) { + multi = 1; + + if (strlen(slash_ptr + 1) > 4) { + tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1); + + if (strnicmp(tmp_ptr, "mbit", 4) == 0) + multi = 1024; + + if ((strnicmp(tmp_ptr, "kbit", 4) == 0) || + (multi > 1)) + *tmp_ptr = '\0'; + } + + ret = strict_strtoul(slash_ptr + 1, 10, up); + if (ret) { + bat_err(net_dev, + "Upload speed of gateway mode invalid: " + "%s\n", slash_ptr + 1); + return false; + } + + *up *= multi; + } + + return true; +} + +ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count) +{ + struct bat_priv *bat_priv = netdev_priv(net_dev); + long gw_bandwidth_tmp = 0, up = 0, down = 0; + bool ret; + + ret = parse_gw_bandwidth(net_dev, buff, &up, &down); + if (!ret) + goto end; + + if ((!down) || (down < 256)) + down = 2000; + + if (!up) + up = down / 5; + + kbit_to_gw_bandwidth(down, up, &gw_bandwidth_tmp); + + /** + * the gw bandwidth we guessed above might not match the given + * speeds, hence we need to calculate it back to show the number + * that is going to be propagated + **/ + gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp, + (int *)&down, (int *)&up); + + gw_deselect(bat_priv); + bat_info(net_dev, "Changing gateway bandwidth from: '%i' to: '%ld' " + "(propagating: %ld%s/%ld%s)\n", + atomic_read(&bat_priv->gw_bandwidth), gw_bandwidth_tmp, + (down > 2048 ? down / 1024 : down), + (down > 2048 ? "MBit" : "KBit"), + (up > 2048 ? up / 1024 : up), + (up > 2048 ? "MBit" : "KBit")); + + atomic_set(&bat_priv->gw_bandwidth, gw_bandwidth_tmp); + +end: + return count; +} diff --git a/net/batman-adv/gateway_common.h b/net/batman-adv/gateway_common.h new file mode 100644 index 0000000..5e728d0 --- /dev/null +++ b/net/batman-adv/gateway_common.h @@ -0,0 +1,38 @@ +/* + * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_GATEWAY_COMMON_H_ +#define _NET_BATMAN_ADV_GATEWAY_COMMON_H_ + +enum gw_modes { + GW_MODE_OFF, + GW_MODE_CLIENT, + GW_MODE_SERVER, +}; + +#define GW_MODE_OFF_NAME "off" +#define GW_MODE_CLIENT_NAME "client" +#define GW_MODE_SERVER_NAME "server" + +void gw_bandwidth_to_kbit(uint8_t gw_class, int *down, int *up); +ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count); + +#endif /* _NET_BATMAN_ADV_GATEWAY_COMMON_H_ */ diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c new file mode 100644 index 0000000..4f95777 --- /dev/null +++ b/net/batman-adv/hard-interface.c @@ -0,0 +1,651 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "hard-interface.h" +#include "soft-interface.h" +#include "send.h" +#include "translation-table.h" +#include "routing.h" +#include "bat_sysfs.h" +#include "originator.h" +#include "hash.h" + +#include <linux/if_arp.h> + +/* protect update critical side of if_list - but not the content */ +static DEFINE_SPINLOCK(if_list_lock); + +static void hardif_free_rcu(struct rcu_head *rcu) +{ + struct batman_if *batman_if; + + batman_if = container_of(rcu, struct batman_if, rcu); + dev_put(batman_if->net_dev); + kref_put(&batman_if->refcount, hardif_free_ref); +} + +struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev) +{ + struct batman_if *batman_if; + + rcu_read_lock(); + list_for_each_entry_rcu(batman_if, &if_list, list) { + if (batman_if->net_dev == net_dev) + goto out; + } + + batman_if = NULL; + +out: + if (batman_if) + kref_get(&batman_if->refcount); + + rcu_read_unlock(); + return batman_if; +} + +static int is_valid_iface(struct net_device *net_dev) +{ + if (net_dev->flags & IFF_LOOPBACK) + return 0; + + if (net_dev->type != ARPHRD_ETHER) + return 0; + + if (net_dev->addr_len != ETH_ALEN) + return 0; + + /* no batman over batman */ +#ifdef HAVE_NET_DEVICE_OPS + if (net_dev->netdev_ops->ndo_start_xmit == interface_tx) + return 0; +#else + if (net_dev->hard_start_xmit == interface_tx) + return 0; +#endif + + /* Device is being bridged */ + /* if (net_dev->priv_flags & IFF_BRIDGE_PORT) + return 0; */ + + return 1; +} + +static struct batman_if *get_active_batman_if(struct net_device *soft_iface) +{ + struct batman_if *batman_if; + + rcu_read_lock(); + list_for_each_entry_rcu(batman_if, &if_list, list) { + if (batman_if->soft_iface != soft_iface) + continue; + + if (batman_if->if_status == IF_ACTIVE) + goto out; + } + + batman_if = NULL; + +out: + if (batman_if) + kref_get(&batman_if->refcount); + + rcu_read_unlock(); + return batman_if; +} + +static void update_primary_addr(struct bat_priv *bat_priv) +{ + struct vis_packet *vis_packet; + + vis_packet = (struct vis_packet *) + bat_priv->my_vis_info->skb_packet->data; + memcpy(vis_packet->vis_orig, + bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); + memcpy(vis_packet->sender_orig, + bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); +} + +static void set_primary_if(struct bat_priv *bat_priv, + struct batman_if *batman_if) +{ + struct batman_packet *batman_packet; + struct batman_if *old_if; + + if (batman_if) + kref_get(&batman_if->refcount); + + old_if = bat_priv->primary_if; + bat_priv->primary_if = batman_if; + + if (old_if) + kref_put(&old_if->refcount, hardif_free_ref); + + if (!bat_priv->primary_if) + return; + + batman_packet = (struct batman_packet *)(batman_if->packet_buff); + batman_packet->flags = PRIMARIES_FIRST_HOP; + batman_packet->ttl = TTL; + + update_primary_addr(bat_priv); + + /*** + * hacky trick to make sure that we send the HNA information via + * our new primary interface + */ + atomic_set(&bat_priv->hna_local_changed, 1); +} + +static bool hardif_is_iface_up(struct batman_if *batman_if) +{ + if (batman_if->net_dev->flags & IFF_UP) + return true; + + return false; +} + +static void update_mac_addresses(struct batman_if *batman_if) +{ + memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig, + batman_if->net_dev->dev_addr, ETH_ALEN); + memcpy(((struct batman_packet *)(batman_if->packet_buff))->prev_sender, + batman_if->net_dev->dev_addr, ETH_ALEN); +} + +static void check_known_mac_addr(struct net_device *net_dev) +{ + struct batman_if *batman_if; + + rcu_read_lock(); + list_for_each_entry_rcu(batman_if, &if_list, list) { + if ((batman_if->if_status != IF_ACTIVE) && + (batman_if->if_status != IF_TO_BE_ACTIVATED)) + continue; + + if (batman_if->net_dev == net_dev) + continue; + + if (!compare_orig(batman_if->net_dev->dev_addr, + net_dev->dev_addr)) + continue; + + pr_warning("The newly added mac address (%pM) already exists " + "on: %s\n", net_dev->dev_addr, + batman_if->net_dev->name); + pr_warning("It is strongly recommended to keep mac addresses " + "unique to avoid problems!\n"); + } + rcu_read_unlock(); +} + +int hardif_min_mtu(struct net_device *soft_iface) +{ + struct bat_priv *bat_priv = netdev_priv(soft_iface); + struct batman_if *batman_if; + /* allow big frames if all devices are capable to do so + * (have MTU > 1500 + BAT_HEADER_LEN) */ + int min_mtu = ETH_DATA_LEN; + + if (atomic_read(&bat_priv->fragmentation)) + goto out; + + rcu_read_lock(); + list_for_each_entry_rcu(batman_if, &if_list, list) { + if ((batman_if->if_status != IF_ACTIVE) && + (batman_if->if_status != IF_TO_BE_ACTIVATED)) + continue; + + if (batman_if->soft_iface != soft_iface) + continue; + + min_mtu = min_t(int, batman_if->net_dev->mtu - BAT_HEADER_LEN, + min_mtu); + } + rcu_read_unlock(); +out: + return min_mtu; +} + +/* adjusts the MTU if a new interface with a smaller MTU appeared. */ +void update_min_mtu(struct net_device *soft_iface) +{ + int min_mtu; + + min_mtu = hardif_min_mtu(soft_iface); + if (soft_iface->mtu != min_mtu) + soft_iface->mtu = min_mtu; +} + +static void hardif_activate_interface(struct batman_if *batman_if) +{ + struct bat_priv *bat_priv; + + if (batman_if->if_status != IF_INACTIVE) + return; + + bat_priv = netdev_priv(batman_if->soft_iface); + + update_mac_addresses(batman_if); + batman_if->if_status = IF_TO_BE_ACTIVATED; + + /** + * the first active interface becomes our primary interface or + * the next active interface after the old primay interface was removed + */ + if (!bat_priv->primary_if) + set_primary_if(bat_priv, batman_if); + + bat_info(batman_if->soft_iface, "Interface activated: %s\n", + batman_if->net_dev->name); + + update_min_mtu(batman_if->soft_iface); + return; +} + +static void hardif_deactivate_interface(struct batman_if *batman_if) +{ + if ((batman_if->if_status != IF_ACTIVE) && + (batman_if->if_status != IF_TO_BE_ACTIVATED)) + return; + + batman_if->if_status = IF_INACTIVE; + + bat_info(batman_if->soft_iface, "Interface deactivated: %s\n", + batman_if->net_dev->name); + + update_min_mtu(batman_if->soft_iface); +} + +int hardif_enable_interface(struct batman_if *batman_if, char *iface_name) +{ + struct bat_priv *bat_priv; + struct batman_packet *batman_packet; + + if (batman_if->if_status != IF_NOT_IN_USE) + goto out; + + batman_if->soft_iface = dev_get_by_name(&init_net, iface_name); + + if (!batman_if->soft_iface) { + batman_if->soft_iface = softif_create(iface_name); + + if (!batman_if->soft_iface) + goto err; + + /* dev_get_by_name() increases the reference counter for us */ + dev_hold(batman_if->soft_iface); + } + + bat_priv = netdev_priv(batman_if->soft_iface); + batman_if->packet_len = BAT_PACKET_LEN; + batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_ATOMIC); + + if (!batman_if->packet_buff) { + bat_err(batman_if->soft_iface, "Can't add interface packet " + "(%s): out of memory\n", batman_if->net_dev->name); + goto err; + } + + batman_packet = (struct batman_packet *)(batman_if->packet_buff); + batman_packet->packet_type = BAT_PACKET; + batman_packet->version = COMPAT_VERSION; + batman_packet->flags = 0; + batman_packet->ttl = 2; + batman_packet->tq = TQ_MAX_VALUE; + batman_packet->num_hna = 0; + + batman_if->if_num = bat_priv->num_ifaces; + bat_priv->num_ifaces++; + batman_if->if_status = IF_INACTIVE; + orig_hash_add_if(batman_if, bat_priv->num_ifaces); + + batman_if->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN); + batman_if->batman_adv_ptype.func = batman_skb_recv; + batman_if->batman_adv_ptype.dev = batman_if->net_dev; + kref_get(&batman_if->refcount); + dev_add_pack(&batman_if->batman_adv_ptype); + + atomic_set(&batman_if->seqno, 1); + atomic_set(&batman_if->frag_seqno, 1); + bat_info(batman_if->soft_iface, "Adding interface: %s\n", + batman_if->net_dev->name); + + if (atomic_read(&bat_priv->fragmentation) && batman_if->net_dev->mtu < + ETH_DATA_LEN + BAT_HEADER_LEN) + bat_info(batman_if->soft_iface, + "The MTU of interface %s is too small (%i) to handle " + "the transport of batman-adv packets. Packets going " + "over this interface will be fragmented on layer2 " + "which could impact the performance. Setting the MTU " + "to %zi would solve the problem.\n", + batman_if->net_dev->name, batman_if->net_dev->mtu, + ETH_DATA_LEN + BAT_HEADER_LEN); + + if (!atomic_read(&bat_priv->fragmentation) && batman_if->net_dev->mtu < + ETH_DATA_LEN + BAT_HEADER_LEN) + bat_info(batman_if->soft_iface, + "The MTU of interface %s is too small (%i) to handle " + "the transport of batman-adv packets. If you experience" + " problems getting traffic through try increasing the " + "MTU to %zi.\n", + batman_if->net_dev->name, batman_if->net_dev->mtu, + ETH_DATA_LEN + BAT_HEADER_LEN); + + if (hardif_is_iface_up(batman_if)) + hardif_activate_interface(batman_if); + else + bat_err(batman_if->soft_iface, "Not using interface %s " + "(retrying later): interface not active\n", + batman_if->net_dev->name); + + /* begin scheduling originator messages on that interface */ + schedule_own_packet(batman_if); + +out: + return 0; + +err: + return -ENOMEM; +} + +void hardif_disable_interface(struct batman_if *batman_if) +{ + struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); + + if (batman_if->if_status == IF_ACTIVE) + hardif_deactivate_interface(batman_if); + + if (batman_if->if_status != IF_INACTIVE) + return; + + bat_info(batman_if->soft_iface, "Removing interface: %s\n", + batman_if->net_dev->name); + dev_remove_pack(&batman_if->batman_adv_ptype); + kref_put(&batman_if->refcount, hardif_free_ref); + + bat_priv->num_ifaces--; + orig_hash_del_if(batman_if, bat_priv->num_ifaces); + + if (batman_if == bat_priv->primary_if) { + struct batman_if *new_if; + + new_if = get_active_batman_if(batman_if->soft_iface); + set_primary_if(bat_priv, new_if); + + if (new_if) + kref_put(&new_if->refcount, hardif_free_ref); + } + + kfree(batman_if->packet_buff); + batman_if->packet_buff = NULL; + batman_if->if_status = IF_NOT_IN_USE; + + /* delete all references to this batman_if */ + purge_orig_ref(bat_priv); + purge_outstanding_packets(bat_priv, batman_if); + dev_put(batman_if->soft_iface); + + /* nobody uses this interface anymore */ + if (!bat_priv->num_ifaces) + softif_destroy(batman_if->soft_iface); + + batman_if->soft_iface = NULL; +} + +static struct batman_if *hardif_add_interface(struct net_device *net_dev) +{ + struct batman_if *batman_if; + int ret; + + ret = is_valid_iface(net_dev); + if (ret != 1) + goto out; + + dev_hold(net_dev); + + batman_if = kmalloc(sizeof(struct batman_if), GFP_ATOMIC); + if (!batman_if) { + pr_err("Can't add interface (%s): out of memory\n", + net_dev->name); + goto release_dev; + } + + ret = sysfs_add_hardif(&batman_if->hardif_obj, net_dev); + if (ret) + goto free_if; + + batman_if->if_num = -1; + batman_if->net_dev = net_dev; + batman_if->soft_iface = NULL; + batman_if->if_status = IF_NOT_IN_USE; + INIT_LIST_HEAD(&batman_if->list); + kref_init(&batman_if->refcount); + + check_known_mac_addr(batman_if->net_dev); + + spin_lock(&if_list_lock); + list_add_tail_rcu(&batman_if->list, &if_list); + spin_unlock(&if_list_lock); + + /* extra reference for return */ + kref_get(&batman_if->refcount); + return batman_if; + +free_if: + kfree(batman_if); +release_dev: + dev_put(net_dev); +out: + return NULL; +} + +static void hardif_remove_interface(struct batman_if *batman_if) +{ + /* first deactivate interface */ + if (batman_if->if_status != IF_NOT_IN_USE) + hardif_disable_interface(batman_if); + + if (batman_if->if_status != IF_NOT_IN_USE) + return; + + batman_if->if_status = IF_TO_BE_REMOVED; + sysfs_del_hardif(&batman_if->hardif_obj); + call_rcu(&batman_if->rcu, hardif_free_rcu); +} + +void hardif_remove_interfaces(void) +{ + struct batman_if *batman_if, *batman_if_tmp; + struct list_head if_queue; + + INIT_LIST_HEAD(&if_queue); + + spin_lock(&if_list_lock); + list_for_each_entry_safe(batman_if, batman_if_tmp, &if_list, list) { + list_del_rcu(&batman_if->list); + list_add_tail(&batman_if->list, &if_queue); + } + spin_unlock(&if_list_lock); + + rtnl_lock(); + list_for_each_entry_safe(batman_if, batman_if_tmp, &if_queue, list) { + hardif_remove_interface(batman_if); + } + rtnl_unlock(); +} + +static int hard_if_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct net_device *net_dev = (struct net_device *)ptr; + struct batman_if *batman_if = get_batman_if_by_netdev(net_dev); + struct bat_priv *bat_priv; + + if (!batman_if && event == NETDEV_REGISTER) + batman_if = hardif_add_interface(net_dev); + + if (!batman_if) + goto out; + + switch (event) { + case NETDEV_UP: + hardif_activate_interface(batman_if); + break; + case NETDEV_GOING_DOWN: + case NETDEV_DOWN: + hardif_deactivate_interface(batman_if); + break; + case NETDEV_UNREGISTER: + spin_lock(&if_list_lock); + list_del_rcu(&batman_if->list); + spin_unlock(&if_list_lock); + + hardif_remove_interface(batman_if); + break; + case NETDEV_CHANGEMTU: + if (batman_if->soft_iface) + update_min_mtu(batman_if->soft_iface); + break; + case NETDEV_CHANGEADDR: + if (batman_if->if_status == IF_NOT_IN_USE) + goto hardif_put; + + check_known_mac_addr(batman_if->net_dev); + update_mac_addresses(batman_if); + + bat_priv = netdev_priv(batman_if->soft_iface); + if (batman_if == bat_priv->primary_if) + update_primary_addr(bat_priv); + break; + default: + break; + }; + +hardif_put: + kref_put(&batman_if->refcount, hardif_free_ref); +out: + return NOTIFY_DONE; +} + +/* receive a packet with the batman ethertype coming on a hard + * interface */ +int batman_skb_recv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *ptype, struct net_device *orig_dev) +{ + struct bat_priv *bat_priv; + struct batman_packet *batman_packet; + struct batman_if *batman_if; + int ret; + + batman_if = container_of(ptype, struct batman_if, batman_adv_ptype); + skb = skb_share_check(skb, GFP_ATOMIC); + + /* skb was released by skb_share_check() */ + if (!skb) + goto err_out; + + /* packet should hold at least type and version */ + if (unlikely(!pskb_may_pull(skb, 2))) + goto err_free; + + /* expect a valid ethernet header here. */ + if (unlikely(skb->mac_len != sizeof(struct ethhdr) + || !skb_mac_header(skb))) + goto err_free; + + if (!batman_if->soft_iface) + goto err_free; + + bat_priv = netdev_priv(batman_if->soft_iface); + + if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE) + goto err_free; + + /* discard frames on not active interfaces */ + if (batman_if->if_status != IF_ACTIVE) + goto err_free; + + batman_packet = (struct batman_packet *)skb->data; + + if (batman_packet->version != COMPAT_VERSION) { + bat_dbg(DBG_BATMAN, bat_priv, + "Drop packet: incompatible batman version (%i)\n", + batman_packet->version); + goto err_free; + } + + /* all receive handlers return whether they received or reused + * the supplied skb. if not, we have to free the skb. */ + + switch (batman_packet->packet_type) { + /* batman originator packet */ + case BAT_PACKET: + ret = recv_bat_packet(skb, batman_if); + break; + + /* batman icmp packet */ + case BAT_ICMP: + ret = recv_icmp_packet(skb, batman_if); + break; + + /* unicast packet */ + case BAT_UNICAST: + ret = recv_unicast_packet(skb, batman_if); + break; + + /* fragmented unicast packet */ + case BAT_UNICAST_FRAG: + ret = recv_ucast_frag_packet(skb, batman_if); + break; + + /* broadcast packet */ + case BAT_BCAST: + ret = recv_bcast_packet(skb, batman_if); + break; + + /* vis packet */ + case BAT_VIS: + ret = recv_vis_packet(skb, batman_if); + break; + default: + ret = NET_RX_DROP; + } + + if (ret == NET_RX_DROP) + kfree_skb(skb); + + /* return NET_RX_SUCCESS in any case as we + * most probably dropped the packet for + * routing-logical reasons. */ + + return NET_RX_SUCCESS; + +err_free: + kfree_skb(skb); +err_out: + return NET_RX_DROP; +} + +struct notifier_block hard_if_notifier = { + .notifier_call = hard_if_event, +}; diff --git a/net/batman-adv/hard-interface.h b/net/batman-adv/hard-interface.h new file mode 100644 index 0000000..30ec3b8 --- /dev/null +++ b/net/batman-adv/hard-interface.h @@ -0,0 +1,53 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_ +#define _NET_BATMAN_ADV_HARD_INTERFACE_H_ + +#define IF_NOT_IN_USE 0 +#define IF_TO_BE_REMOVED 1 +#define IF_INACTIVE 2 +#define IF_ACTIVE 3 +#define IF_TO_BE_ACTIVATED 4 +#define IF_I_WANT_YOU 5 + +extern struct notifier_block hard_if_notifier; + +struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev); +int hardif_enable_interface(struct batman_if *batman_if, char *iface_name); +void hardif_disable_interface(struct batman_if *batman_if); +void hardif_remove_interfaces(void); +int batman_skb_recv(struct sk_buff *skb, + struct net_device *dev, + struct packet_type *ptype, + struct net_device *orig_dev); +int hardif_min_mtu(struct net_device *soft_iface); +void update_min_mtu(struct net_device *soft_iface); + +static inline void hardif_free_ref(struct kref *refcount) +{ + struct batman_if *batman_if; + + batman_if = container_of(refcount, struct batman_if, refcount); + kfree(batman_if); +} + +#endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */ diff --git a/net/batman-adv/hash.c b/net/batman-adv/hash.c new file mode 100644 index 0000000..26e623e --- /dev/null +++ b/net/batman-adv/hash.c @@ -0,0 +1,62 @@ +/* + * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors: + * + * Simon Wunderlich, Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "hash.h" + +/* clears the hash */ +static void hash_init(struct hashtable_t *hash) +{ + int i; + + for (i = 0 ; i < hash->size; i++) + INIT_HLIST_HEAD(&hash->table[i]); +} + +/* free only the hashtable and the hash itself. */ +void hash_destroy(struct hashtable_t *hash) +{ + kfree(hash->table); + kfree(hash); +} + +/* allocates and clears the hash */ +struct hashtable_t *hash_new(int size) +{ + struct hashtable_t *hash; + + hash = kmalloc(sizeof(struct hashtable_t) , GFP_ATOMIC); + + if (!hash) + return NULL; + + hash->size = size; + hash->table = kmalloc(sizeof(struct element_t *) * size, GFP_ATOMIC); + + if (!hash->table) { + kfree(hash); + return NULL; + } + + hash_init(hash); + + return hash; +} diff --git a/net/batman-adv/hash.h b/net/batman-adv/hash.h new file mode 100644 index 0000000..09216ad --- /dev/null +++ b/net/batman-adv/hash.h @@ -0,0 +1,176 @@ +/* + * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors: + * + * Simon Wunderlich, Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_HASH_H_ +#define _NET_BATMAN_ADV_HASH_H_ + +#include <linux/list.h> + +/* callback to a compare function. should + * compare 2 element datas for their keys, + * return 0 if same and not 0 if not + * same */ +typedef int (*hashdata_compare_cb)(void *, void *); + +/* the hashfunction, should return an index + * based on the key in the data of the first + * argument and the size the second */ +typedef int (*hashdata_choose_cb)(void *, int); +typedef void (*hashdata_free_cb)(void *, void *); + +struct element_t { + void *data; /* pointer to the data */ + struct hlist_node hlist; /* bucket list pointer */ +}; + +struct hashtable_t { + struct hlist_head *table; /* the hashtable itself, with the buckets */ + int size; /* size of hashtable */ +}; + +/* allocates and clears the hash */ +struct hashtable_t *hash_new(int size); + +/* remove element if you already found the element you want to delete and don't + * need the overhead to find it again with hash_remove(). But usually, you + * don't want to use this function, as it fiddles with hash-internals. */ +void *hash_remove_element(struct hashtable_t *hash, struct element_t *elem); + +/* free only the hashtable and the hash itself. */ +void hash_destroy(struct hashtable_t *hash); + +/* remove the hash structure. if hashdata_free_cb != NULL, this function will be + * called to remove the elements inside of the hash. if you don't remove the + * elements, memory might be leaked. */ +static inline void hash_delete(struct hashtable_t *hash, + hashdata_free_cb free_cb, void *arg) +{ + struct hlist_head *head; + struct hlist_node *walk, *safe; + struct element_t *bucket; + int i; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_safe(walk, safe, head) { + bucket = hlist_entry(walk, struct element_t, hlist); + if (free_cb) + free_cb(bucket->data, arg); + + hlist_del(walk); + kfree(bucket); + } + } + + hash_destroy(hash); +} + +/* adds data to the hashtable. returns 0 on success, -1 on error */ +static inline int hash_add(struct hashtable_t *hash, + hashdata_compare_cb compare, + hashdata_choose_cb choose, void *data) +{ + int index; + struct hlist_head *head; + struct hlist_node *walk, *safe; + struct element_t *bucket; + + if (!hash) + return -1; + + index = choose(data, hash->size); + head = &hash->table[index]; + + hlist_for_each_safe(walk, safe, head) { + bucket = hlist_entry(walk, struct element_t, hlist); + if (compare(bucket->data, data)) + return -1; + } + + /* no duplicate found in list, add new element */ + bucket = kmalloc(sizeof(struct element_t), GFP_ATOMIC); + + if (!bucket) + return -1; + + bucket->data = data; + hlist_add_head(&bucket->hlist, head); + + return 0; +} + +/* removes data from hash, if found. returns pointer do data on success, so you + * can remove the used structure yourself, or NULL on error . data could be the + * structure you use with just the key filled, we just need the key for + * comparing. */ +static inline void *hash_remove(struct hashtable_t *hash, + hashdata_compare_cb compare, + hashdata_choose_cb choose, void *data) +{ + size_t index; + struct hlist_node *walk; + struct element_t *bucket; + struct hlist_head *head; + void *data_save; + + index = choose(data, hash->size); + head = &hash->table[index]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + if (compare(bucket->data, data)) { + data_save = bucket->data; + hlist_del(walk); + kfree(bucket); + return data_save; + } + } + + return NULL; +} + +/* finds data, based on the key in keydata. returns the found data on success, + * or NULL on error */ +static inline void *hash_find(struct hashtable_t *hash, + hashdata_compare_cb compare, + hashdata_choose_cb choose, void *keydata) +{ + int index; + struct hlist_head *head; + struct hlist_node *walk; + struct element_t *bucket; + + if (!hash) + return NULL; + + index = choose(keydata , hash->size); + head = &hash->table[index]; + + hlist_for_each(walk, head) { + bucket = hlist_entry(walk, struct element_t, hlist); + if (compare(bucket->data, keydata)) + return bucket->data; + } + + return NULL; +} + +#endif /* _NET_BATMAN_ADV_HASH_H_ */ diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c new file mode 100644 index 0000000..ecf6d7f --- /dev/null +++ b/net/batman-adv/icmp_socket.c @@ -0,0 +1,356 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include <linux/debugfs.h> +#include <linux/slab.h> +#include "icmp_socket.h" +#include "send.h" +#include "types.h" +#include "hash.h" +#include "originator.h" +#include "hard-interface.h" + +static struct socket_client *socket_client_hash[256]; + +static void bat_socket_add_packet(struct socket_client *socket_client, + struct icmp_packet_rr *icmp_packet, + size_t icmp_len); + +void bat_socket_init(void) +{ + memset(socket_client_hash, 0, sizeof(socket_client_hash)); +} + +static int bat_socket_open(struct inode *inode, struct file *file) +{ + unsigned int i; + struct socket_client *socket_client; + + nonseekable_open(inode, file); + + socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL); + + if (!socket_client) + return -ENOMEM; + + for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) { + if (!socket_client_hash[i]) { + socket_client_hash[i] = socket_client; + break; + } + } + + if (i == ARRAY_SIZE(socket_client_hash)) { + pr_err("Error - can't add another packet client: " + "maximum number of clients reached\n"); + kfree(socket_client); + return -EXFULL; + } + + INIT_LIST_HEAD(&socket_client->queue_list); + socket_client->queue_len = 0; + socket_client->index = i; + socket_client->bat_priv = inode->i_private; + spin_lock_init(&socket_client->lock); + init_waitqueue_head(&socket_client->queue_wait); + + file->private_data = socket_client; + + inc_module_count(); + return 0; +} + +static int bat_socket_release(struct inode *inode, struct file *file) +{ + struct socket_client *socket_client = file->private_data; + struct socket_packet *socket_packet; + struct list_head *list_pos, *list_pos_tmp; + + spin_lock_bh(&socket_client->lock); + + /* for all packets in the queue ... */ + list_for_each_safe(list_pos, list_pos_tmp, &socket_client->queue_list) { + socket_packet = list_entry(list_pos, + struct socket_packet, list); + + list_del(list_pos); + kfree(socket_packet); + } + + socket_client_hash[socket_client->index] = NULL; + spin_unlock_bh(&socket_client->lock); + + kfree(socket_client); + dec_module_count(); + + return 0; +} + +static ssize_t bat_socket_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct socket_client *socket_client = file->private_data; + struct socket_packet *socket_packet; + size_t packet_len; + int error; + + if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0)) + return -EAGAIN; + + if ((!buf) || (count < sizeof(struct icmp_packet))) + return -EINVAL; + + if (!access_ok(VERIFY_WRITE, buf, count)) + return -EFAULT; + + error = wait_event_interruptible(socket_client->queue_wait, + socket_client->queue_len); + + if (error) + return error; + + spin_lock_bh(&socket_client->lock); + + socket_packet = list_first_entry(&socket_client->queue_list, + struct socket_packet, list); + list_del(&socket_packet->list); + socket_client->queue_len--; + + spin_unlock_bh(&socket_client->lock); + + error = __copy_to_user(buf, &socket_packet->icmp_packet, + socket_packet->icmp_len); + + packet_len = socket_packet->icmp_len; + kfree(socket_packet); + + if (error) + return -EFAULT; + + return packet_len; +} + +static ssize_t bat_socket_write(struct file *file, const char __user *buff, + size_t len, loff_t *off) +{ + struct socket_client *socket_client = file->private_data; + struct bat_priv *bat_priv = socket_client->bat_priv; + struct sk_buff *skb; + struct icmp_packet_rr *icmp_packet; + + struct orig_node *orig_node; + struct batman_if *batman_if; + size_t packet_len = sizeof(struct icmp_packet); + uint8_t dstaddr[ETH_ALEN]; + + if (len < sizeof(struct icmp_packet)) { + bat_dbg(DBG_BATMAN, bat_priv, + "Error - can't send packet from char device: " + "invalid packet size\n"); + return -EINVAL; + } + + if (!bat_priv->primary_if) + return -EFAULT; + + if (len >= sizeof(struct icmp_packet_rr)) + packet_len = sizeof(struct icmp_packet_rr); + + skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr)); + if (!skb) + return -ENOMEM; + + skb_reserve(skb, sizeof(struct ethhdr)); + icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len); + + if (!access_ok(VERIFY_READ, buff, packet_len)) { + len = -EFAULT; + goto free_skb; + } + + if (__copy_from_user(icmp_packet, buff, packet_len)) { + len = -EFAULT; + goto free_skb; + } + + if (icmp_packet->packet_type != BAT_ICMP) { + bat_dbg(DBG_BATMAN, bat_priv, + "Error - can't send packet from char device: " + "got bogus packet type (expected: BAT_ICMP)\n"); + len = -EINVAL; + goto free_skb; + } + + if (icmp_packet->msg_type != ECHO_REQUEST) { + bat_dbg(DBG_BATMAN, bat_priv, + "Error - can't send packet from char device: " + "got bogus message type (expected: ECHO_REQUEST)\n"); + len = -EINVAL; + goto free_skb; + } + + icmp_packet->uid = socket_client->index; + + if (icmp_packet->version != COMPAT_VERSION) { + icmp_packet->msg_type = PARAMETER_PROBLEM; + icmp_packet->ttl = COMPAT_VERSION; + bat_socket_add_packet(socket_client, icmp_packet, packet_len); + goto free_skb; + } + + if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE) + goto dst_unreach; + + spin_lock_bh(&bat_priv->orig_hash_lock); + orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash, + compare_orig, choose_orig, + icmp_packet->dst)); + + if (!orig_node) + goto unlock; + + if (!orig_node->router) + goto unlock; + + batman_if = orig_node->router->if_incoming; + memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); + + spin_unlock_bh(&bat_priv->orig_hash_lock); + + if (!batman_if) + goto dst_unreach; + + if (batman_if->if_status != IF_ACTIVE) + goto dst_unreach; + + memcpy(icmp_packet->orig, + bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); + + if (packet_len == sizeof(struct icmp_packet_rr)) + memcpy(icmp_packet->rr, batman_if->net_dev->dev_addr, ETH_ALEN); + + + send_skb_packet(skb, batman_if, dstaddr); + + goto out; + +unlock: + spin_unlock_bh(&bat_priv->orig_hash_lock); +dst_unreach: + icmp_packet->msg_type = DESTINATION_UNREACHABLE; + bat_socket_add_packet(socket_client, icmp_packet, packet_len); +free_skb: + kfree_skb(skb); +out: + return len; +} + +static unsigned int bat_socket_poll(struct file *file, poll_table *wait) +{ + struct socket_client *socket_client = file->private_data; + + poll_wait(file, &socket_client->queue_wait, wait); + + if (socket_client->queue_len > 0) + return POLLIN | POLLRDNORM; + + return 0; +} + +static const struct file_operations fops = { + .owner = THIS_MODULE, + .open = bat_socket_open, + .release = bat_socket_release, + .read = bat_socket_read, + .write = bat_socket_write, + .poll = bat_socket_poll, + .llseek = no_llseek, +}; + +int bat_socket_setup(struct bat_priv *bat_priv) +{ + struct dentry *d; + + if (!bat_priv->debug_dir) + goto err; + + d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR, + bat_priv->debug_dir, bat_priv, &fops); + if (d) + goto err; + + return 0; + +err: + return 1; +} + +static void bat_socket_add_packet(struct socket_client *socket_client, + struct icmp_packet_rr *icmp_packet, + size_t icmp_len) +{ + struct socket_packet *socket_packet; + + socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC); + + if (!socket_packet) + return; + + INIT_LIST_HEAD(&socket_packet->list); + memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len); + socket_packet->icmp_len = icmp_len; + + spin_lock_bh(&socket_client->lock); + + /* while waiting for the lock the socket_client could have been + * deleted */ + if (!socket_client_hash[icmp_packet->uid]) { + spin_unlock_bh(&socket_client->lock); + kfree(socket_packet); + return; + } + + list_add_tail(&socket_packet->list, &socket_client->queue_list); + socket_client->queue_len++; + + if (socket_client->queue_len > 100) { + socket_packet = list_first_entry(&socket_client->queue_list, + struct socket_packet, list); + + list_del(&socket_packet->list); + kfree(socket_packet); + socket_client->queue_len--; + } + + spin_unlock_bh(&socket_client->lock); + + wake_up(&socket_client->queue_wait); +} + +void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet, + size_t icmp_len) +{ + struct socket_client *hash = socket_client_hash[icmp_packet->uid]; + + if (hash) + bat_socket_add_packet(hash, icmp_packet, icmp_len); +} diff --git a/net/batman-adv/icmp_socket.h b/net/batman-adv/icmp_socket.h new file mode 100644 index 0000000..bf9b348 --- /dev/null +++ b/net/batman-adv/icmp_socket.h @@ -0,0 +1,34 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_ICMP_SOCKET_H_ +#define _NET_BATMAN_ADV_ICMP_SOCKET_H_ + +#include "types.h" + +#define ICMP_SOCKET "socket" + +void bat_socket_init(void); +int bat_socket_setup(struct bat_priv *bat_priv); +void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet, + size_t icmp_len); + +#endif /* _NET_BATMAN_ADV_ICMP_SOCKET_H_ */ diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c new file mode 100644 index 0000000..b827f6a --- /dev/null +++ b/net/batman-adv/main.c @@ -0,0 +1,187 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "bat_sysfs.h" +#include "bat_debugfs.h" +#include "routing.h" +#include "send.h" +#include "originator.h" +#include "soft-interface.h" +#include "icmp_socket.h" +#include "translation-table.h" +#include "hard-interface.h" +#include "gateway_client.h" +#include "types.h" +#include "vis.h" +#include "hash.h" + +struct list_head if_list; + +unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; + +struct workqueue_struct *bat_event_workqueue; + +static int __init batman_init(void) +{ + INIT_LIST_HEAD(&if_list); + + /* the name should not be longer than 10 chars - see + * http://lwn.net/Articles/23634/ */ + bat_event_workqueue = create_singlethread_workqueue("bat_events"); + + if (!bat_event_workqueue) + return -ENOMEM; + + bat_socket_init(); + debugfs_init(); + + register_netdevice_notifier(&hard_if_notifier); + + pr_info("B.A.T.M.A.N. advanced %s%s (compatibility version %i) " + "loaded\n", SOURCE_VERSION, REVISION_VERSION_STR, + COMPAT_VERSION); + + return 0; +} + +static void __exit batman_exit(void) +{ + debugfs_destroy(); + unregister_netdevice_notifier(&hard_if_notifier); + hardif_remove_interfaces(); + + flush_workqueue(bat_event_workqueue); + destroy_workqueue(bat_event_workqueue); + bat_event_workqueue = NULL; + + rcu_barrier(); +} + +int mesh_init(struct net_device *soft_iface) +{ + struct bat_priv *bat_priv = netdev_priv(soft_iface); + + spin_lock_init(&bat_priv->orig_hash_lock); + spin_lock_init(&bat_priv->forw_bat_list_lock); + spin_lock_init(&bat_priv->forw_bcast_list_lock); + spin_lock_init(&bat_priv->hna_lhash_lock); + spin_lock_init(&bat_priv->hna_ghash_lock); + spin_lock_init(&bat_priv->gw_list_lock); + spin_lock_init(&bat_priv->vis_hash_lock); + spin_lock_init(&bat_priv->vis_list_lock); + spin_lock_init(&bat_priv->softif_neigh_lock); + + INIT_HLIST_HEAD(&bat_priv->forw_bat_list); + INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); + INIT_HLIST_HEAD(&bat_priv->gw_list); + INIT_HLIST_HEAD(&bat_priv->softif_neigh_list); + + if (originator_init(bat_priv) < 1) + goto err; + + if (hna_local_init(bat_priv) < 1) + goto err; + + if (hna_global_init(bat_priv) < 1) + goto err; + + hna_local_add(soft_iface, soft_iface->dev_addr); + + if (vis_init(bat_priv) < 1) + goto err; + + atomic_set(&bat_priv->mesh_state, MESH_ACTIVE); + goto end; + +err: + pr_err("Unable to allocate memory for mesh information structures: " + "out of mem ?\n"); + mesh_free(soft_iface); + return -1; + +end: + return 0; +} + +void mesh_free(struct net_device *soft_iface) +{ + struct bat_priv *bat_priv = netdev_priv(soft_iface); + + atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING); + + purge_outstanding_packets(bat_priv, NULL); + + vis_quit(bat_priv); + + gw_node_purge(bat_priv); + originator_free(bat_priv); + + hna_local_free(bat_priv); + hna_global_free(bat_priv); + + softif_neigh_purge(bat_priv); + + atomic_set(&bat_priv->mesh_state, MESH_INACTIVE); +} + +void inc_module_count(void) +{ + try_module_get(THIS_MODULE); +} + +void dec_module_count(void) +{ + module_put(THIS_MODULE); +} + +int is_my_mac(uint8_t *addr) +{ + struct batman_if *batman_if; + + rcu_read_lock(); + list_for_each_entry_rcu(batman_if, &if_list, list) { + if (batman_if->if_status != IF_ACTIVE) + continue; + + if (compare_orig(batman_if->net_dev->dev_addr, addr)) { + rcu_read_unlock(); + return 1; + } + } + rcu_read_unlock(); + return 0; + +} + +module_init(batman_init); +module_exit(batman_exit); + +MODULE_LICENSE("GPL"); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE); +#ifdef REVISION_VERSION +MODULE_VERSION(SOURCE_VERSION "-" REVISION_VERSION); +#else +MODULE_VERSION(SOURCE_VERSION); +#endif diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h new file mode 100644 index 0000000..d4d9926 --- /dev/null +++ b/net/batman-adv/main.h @@ -0,0 +1,183 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_MAIN_H_ +#define _NET_BATMAN_ADV_MAIN_H_ + +/* Kernel Programming */ +#define LINUX + +#define DRIVER_AUTHOR "Marek Lindner <lindner_marek@yahoo.de>, " \ + "Simon Wunderlich <siwu@hrz.tu-chemnitz.de>" +#define DRIVER_DESC "B.A.T.M.A.N. advanced" +#define DRIVER_DEVICE "batman-adv" + +#define SOURCE_VERSION "next" + + +/* B.A.T.M.A.N. parameters */ + +#define TQ_MAX_VALUE 255 +#define JITTER 20 +#define TTL 50 /* Time To Live of broadcast messages */ + +#define PURGE_TIMEOUT 200 /* purge originators after time in seconds if no + * valid packet comes in -> TODO: check + * influence on TQ_LOCAL_WINDOW_SIZE */ +#define LOCAL_HNA_TIMEOUT 3600 /* in seconds */ + +#define TQ_LOCAL_WINDOW_SIZE 64 /* sliding packet range of received originator + * messages in squence numbers (should be a + * multiple of our word size) */ +#define TQ_GLOBAL_WINDOW_SIZE 5 +#define TQ_LOCAL_BIDRECT_SEND_MINIMUM 1 +#define TQ_LOCAL_BIDRECT_RECV_MINIMUM 1 +#define TQ_TOTAL_BIDRECT_LIMIT 1 + +#define NUM_WORDS (TQ_LOCAL_WINDOW_SIZE / WORD_BIT_SIZE) + +#define PACKBUFF_SIZE 2000 +#define LOG_BUF_LEN 8192 /* has to be a power of 2 */ + +#define VIS_INTERVAL 5000 /* 5 seconds */ + +/* how much worse secondary interfaces may be to + * to be considered as bonding candidates */ + +#define BONDING_TQ_THRESHOLD 50 + +#define MAX_AGGREGATION_BYTES 512 /* should not be bigger than 512 bytes or + * change the size of + * forw_packet->direct_link_flags */ +#define MAX_AGGREGATION_MS 100 + +#define SOFTIF_NEIGH_TIMEOUT 180000 /* 3 minutes */ + +#define RESET_PROTECTION_MS 30000 +#define EXPECTED_SEQNO_RANGE 65536 +/* don't reset again within 30 seconds */ + +#define MESH_INACTIVE 0 +#define MESH_ACTIVE 1 +#define MESH_DEACTIVATING 2 + +#define BCAST_QUEUE_LEN 256 +#define BATMAN_QUEUE_LEN 256 + +/* + * Debug Messages + */ +#ifdef pr_fmt +#undef pr_fmt +#endif +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt /* Append 'batman-adv: ' before + * kernel messages */ + +#define DBG_BATMAN 1 /* all messages related to routing / flooding / + * broadcasting / etc */ +#define DBG_ROUTES 2 /* route or hna added / changed / deleted */ +#define DBG_ALL 3 + +#define LOG_BUF_LEN 8192 /* has to be a power of 2 */ + + +/* + * Vis + */ + +/* #define VIS_SUBCLUSTERS_DISABLED */ + +/* + * Kernel headers + */ + +#include <linux/mutex.h> /* mutex */ +#include <linux/module.h> /* needed by all modules */ +#include <linux/netdevice.h> /* netdevice */ +#include <linux/etherdevice.h> /* ethernet address classifaction */ +#include <linux/if_ether.h> /* ethernet header */ +#include <linux/poll.h> /* poll_table */ +#include <linux/kthread.h> /* kernel threads */ +#include <linux/pkt_sched.h> /* schedule types */ +#include <linux/workqueue.h> /* workqueue */ +#include <linux/slab.h> +#include <net/sock.h> /* struct sock */ +#include <linux/jiffies.h> +#include <linux/seq_file.h> +#include "types.h" + +#ifndef REVISION_VERSION +#define REVISION_VERSION_STR "" +#else +#define REVISION_VERSION_STR " "REVISION_VERSION +#endif + +extern struct list_head if_list; + +extern unsigned char broadcast_addr[]; +extern struct workqueue_struct *bat_event_workqueue; + +int mesh_init(struct net_device *soft_iface); +void mesh_free(struct net_device *soft_iface); +void inc_module_count(void); +void dec_module_count(void); +int is_my_mac(uint8_t *addr); + +#ifdef CONFIG_BATMAN_ADV_DEBUG +int debug_log(struct bat_priv *bat_priv, char *fmt, ...); + +#define bat_dbg(type, bat_priv, fmt, arg...) \ + do { \ + if (atomic_read(&bat_priv->log_level) & type) \ + debug_log(bat_priv, fmt, ## arg); \ + } \ + while (0) +#else /* !CONFIG_BATMAN_ADV_DEBUG */ +static inline void bat_dbg(char type __attribute__((unused)), + struct bat_priv *bat_priv __attribute__((unused)), + char *fmt __attribute__((unused)), ...) +{ +} +#endif + +#define bat_warning(net_dev, fmt, arg...) \ + do { \ + struct net_device *_netdev = (net_dev); \ + struct bat_priv *_batpriv = netdev_priv(_netdev); \ + bat_dbg(DBG_ALL, _batpriv, fmt, ## arg); \ + pr_warning("%s: " fmt, _netdev->name, ## arg); \ + } while (0) +#define bat_info(net_dev, fmt, arg...) \ + do { \ + struct net_device *_netdev = (net_dev); \ + struct bat_priv *_batpriv = netdev_priv(_netdev); \ + bat_dbg(DBG_ALL, _batpriv, fmt, ## arg); \ + pr_info("%s: " fmt, _netdev->name, ## arg); \ + } while (0) +#define bat_err(net_dev, fmt, arg...) \ + do { \ + struct net_device *_netdev = (net_dev); \ + struct bat_priv *_batpriv = netdev_priv(_netdev); \ + bat_dbg(DBG_ALL, _batpriv, fmt, ## arg); \ + pr_err("%s: " fmt, _netdev->name, ## arg); \ + } while (0) + +#endif /* _NET_BATMAN_ADV_MAIN_H_ */ diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c new file mode 100644 index 0000000..6b7fb6b --- /dev/null +++ b/net/batman-adv/originator.c @@ -0,0 +1,564 @@ +/* + * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +/* increase the reference counter for this originator */ + +#include "main.h" +#include "originator.h" +#include "hash.h" +#include "translation-table.h" +#include "routing.h" +#include "gateway_client.h" +#include "hard-interface.h" +#include "unicast.h" +#include "soft-interface.h" + +static void purge_orig(struct work_struct *work); + +static void start_purge_timer(struct bat_priv *bat_priv) +{ + INIT_DELAYED_WORK(&bat_priv->orig_work, purge_orig); + queue_delayed_work(bat_event_workqueue, &bat_priv->orig_work, 1 * HZ); +} + +int originator_init(struct bat_priv *bat_priv) +{ + if (bat_priv->orig_hash) + return 1; + + spin_lock_bh(&bat_priv->orig_hash_lock); + bat_priv->orig_hash = hash_new(1024); + + if (!bat_priv->orig_hash) + goto err; + + spin_unlock_bh(&bat_priv->orig_hash_lock); + start_purge_timer(bat_priv); + return 1; + +err: + spin_unlock_bh(&bat_priv->orig_hash_lock); + return 0; +} + +struct neigh_node * +create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node, + uint8_t *neigh, struct batman_if *if_incoming) +{ + struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct neigh_node *neigh_node; + + bat_dbg(DBG_BATMAN, bat_priv, + "Creating new last-hop neighbor of originator\n"); + + neigh_node = kzalloc(sizeof(struct neigh_node), GFP_ATOMIC); + if (!neigh_node) + return NULL; + + INIT_LIST_HEAD(&neigh_node->list); + + memcpy(neigh_node->addr, neigh, ETH_ALEN); + neigh_node->orig_node = orig_neigh_node; + neigh_node->if_incoming = if_incoming; + + list_add_tail(&neigh_node->list, &orig_node->neigh_list); + return neigh_node; +} + +static void free_orig_node(void *data, void *arg) +{ + struct list_head *list_pos, *list_pos_tmp; + struct neigh_node *neigh_node; + struct orig_node *orig_node = (struct orig_node *)data; + struct bat_priv *bat_priv = (struct bat_priv *)arg; + + /* for all neighbors towards this originator ... */ + list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) { + neigh_node = list_entry(list_pos, struct neigh_node, list); + + list_del(list_pos); + kfree(neigh_node); + } + + frag_list_free(&orig_node->frag_list); + hna_global_del_orig(bat_priv, orig_node, "originator timed out"); + + kfree(orig_node->bcast_own); + kfree(orig_node->bcast_own_sum); + kfree(orig_node); +} + +void originator_free(struct bat_priv *bat_priv) +{ + if (!bat_priv->orig_hash) + return; + + cancel_delayed_work_sync(&bat_priv->orig_work); + + spin_lock_bh(&bat_priv->orig_hash_lock); + hash_delete(bat_priv->orig_hash, free_orig_node, bat_priv); + bat_priv->orig_hash = NULL; + spin_unlock_bh(&bat_priv->orig_hash_lock); +} + +/* this function finds or creates an originator entry for the given + * address if it does not exits */ +struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr) +{ + struct orig_node *orig_node; + int size; + int hash_added; + + orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash, + compare_orig, choose_orig, + addr)); + + if (orig_node) + return orig_node; + + bat_dbg(DBG_BATMAN, bat_priv, + "Creating new originator: %pM\n", addr); + + orig_node = kzalloc(sizeof(struct orig_node), GFP_ATOMIC); + if (!orig_node) + return NULL; + + INIT_LIST_HEAD(&orig_node->neigh_list); + + memcpy(orig_node->orig, addr, ETH_ALEN); + orig_node->router = NULL; + orig_node->hna_buff = NULL; + orig_node->bcast_seqno_reset = jiffies - 1 + - msecs_to_jiffies(RESET_PROTECTION_MS); + orig_node->batman_seqno_reset = jiffies - 1 + - msecs_to_jiffies(RESET_PROTECTION_MS); + + size = bat_priv->num_ifaces * sizeof(unsigned long) * NUM_WORDS; + + orig_node->bcast_own = kzalloc(size, GFP_ATOMIC); + if (!orig_node->bcast_own) + goto free_orig_node; + + size = bat_priv->num_ifaces * sizeof(uint8_t); + orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC); + + INIT_LIST_HEAD(&orig_node->frag_list); + orig_node->last_frag_packet = 0; + + if (!orig_node->bcast_own_sum) + goto free_bcast_own; + + hash_added = hash_add(bat_priv->orig_hash, compare_orig, choose_orig, + orig_node); + if (hash_added < 0) + goto free_bcast_own_sum; + + return orig_node; +free_bcast_own_sum: + kfree(orig_node->bcast_own_sum); +free_bcast_own: + kfree(orig_node->bcast_own); +free_orig_node: + kfree(orig_node); + return NULL; +} + +static bool purge_orig_neighbors(struct bat_priv *bat_priv, + struct orig_node *orig_node, + struct neigh_node **best_neigh_node) +{ + struct list_head *list_pos, *list_pos_tmp; + struct neigh_node *neigh_node; + bool neigh_purged = false; + + *best_neigh_node = NULL; + + /* for all neighbors towards this originator ... */ + list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) { + neigh_node = list_entry(list_pos, struct neigh_node, list); + + if ((time_after(jiffies, + neigh_node->last_valid + PURGE_TIMEOUT * HZ)) || + (neigh_node->if_incoming->if_status == IF_INACTIVE) || + (neigh_node->if_incoming->if_status == IF_TO_BE_REMOVED)) { + + if (neigh_node->if_incoming->if_status == + IF_TO_BE_REMOVED) + bat_dbg(DBG_BATMAN, bat_priv, + "neighbor purge: originator %pM, " + "neighbor: %pM, iface: %s\n", + orig_node->orig, neigh_node->addr, + neigh_node->if_incoming->net_dev->name); + else + bat_dbg(DBG_BATMAN, bat_priv, + "neighbor timeout: originator %pM, " + "neighbor: %pM, last_valid: %lu\n", + orig_node->orig, neigh_node->addr, + (neigh_node->last_valid / HZ)); + + neigh_purged = true; + list_del(list_pos); + kfree(neigh_node); + } else { + if ((!*best_neigh_node) || + (neigh_node->tq_avg > (*best_neigh_node)->tq_avg)) + *best_neigh_node = neigh_node; + } + } + return neigh_purged; +} + +static bool purge_orig_node(struct bat_priv *bat_priv, + struct orig_node *orig_node) +{ + struct neigh_node *best_neigh_node; + + if (time_after(jiffies, + orig_node->last_valid + 2 * PURGE_TIMEOUT * HZ)) { + + bat_dbg(DBG_BATMAN, bat_priv, + "Originator timeout: originator %pM, last_valid %lu\n", + orig_node->orig, (orig_node->last_valid / HZ)); + return true; + } else { + if (purge_orig_neighbors(bat_priv, orig_node, + &best_neigh_node)) { + update_routes(bat_priv, orig_node, + best_neigh_node, + orig_node->hna_buff, + orig_node->hna_buff_len); + /* update bonding candidates, we could have lost + * some candidates. */ + update_bonding_candidates(bat_priv, orig_node); + } + } + + return false; +} + +static void _purge_orig(struct bat_priv *bat_priv) +{ + struct hashtable_t *hash = bat_priv->orig_hash; + struct hlist_node *walk, *safe; + struct hlist_head *head; + struct element_t *bucket; + struct orig_node *orig_node; + int i; + + if (!hash) + return; + + spin_lock_bh(&bat_priv->orig_hash_lock); + + /* for all origins... */ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) { + orig_node = bucket->data; + + if (purge_orig_node(bat_priv, orig_node)) { + if (orig_node->gw_flags) + gw_node_delete(bat_priv, orig_node); + hlist_del(walk); + kfree(bucket); + free_orig_node(orig_node, bat_priv); + } + + if (time_after(jiffies, orig_node->last_frag_packet + + msecs_to_jiffies(FRAG_TIMEOUT))) + frag_list_free(&orig_node->frag_list); + } + } + + spin_unlock_bh(&bat_priv->orig_hash_lock); + + gw_node_purge(bat_priv); + gw_election(bat_priv); + + softif_neigh_purge(bat_priv); +} + +static void purge_orig(struct work_struct *work) +{ + struct delayed_work *delayed_work = + container_of(work, struct delayed_work, work); + struct bat_priv *bat_priv = + container_of(delayed_work, struct bat_priv, orig_work); + + _purge_orig(bat_priv); + start_purge_timer(bat_priv); +} + +void purge_orig_ref(struct bat_priv *bat_priv) +{ + _purge_orig(bat_priv); +} + +int orig_seq_print_text(struct seq_file *seq, void *offset) +{ + struct net_device *net_dev = (struct net_device *)seq->private; + struct bat_priv *bat_priv = netdev_priv(net_dev); + struct hashtable_t *hash = bat_priv->orig_hash; + struct hlist_node *walk; + struct hlist_head *head; + struct element_t *bucket; + struct orig_node *orig_node; + struct neigh_node *neigh_node; + int batman_count = 0; + int last_seen_secs; + int last_seen_msecs; + int i; + + if ((!bat_priv->primary_if) || + (bat_priv->primary_if->if_status != IF_ACTIVE)) { + if (!bat_priv->primary_if) + return seq_printf(seq, "BATMAN mesh %s disabled - " + "please specify interfaces to enable it\n", + net_dev->name); + + return seq_printf(seq, "BATMAN mesh %s " + "disabled - primary interface not active\n", + net_dev->name); + } + + seq_printf(seq, "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n", + SOURCE_VERSION, REVISION_VERSION_STR, + bat_priv->primary_if->net_dev->name, + bat_priv->primary_if->net_dev->dev_addr, net_dev->name); + seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n", + "Originator", "last-seen", "#", TQ_MAX_VALUE, "Nexthop", + "outgoingIF", "Potential nexthops"); + + spin_lock_bh(&bat_priv->orig_hash_lock); + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + orig_node = bucket->data; + + if (!orig_node->router) + continue; + + if (orig_node->router->tq_avg == 0) + continue; + + last_seen_secs = jiffies_to_msecs(jiffies - + orig_node->last_valid) / 1000; + last_seen_msecs = jiffies_to_msecs(jiffies - + orig_node->last_valid) % 1000; + + neigh_node = orig_node->router; + seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", + orig_node->orig, last_seen_secs, + last_seen_msecs, neigh_node->tq_avg, + neigh_node->addr, + neigh_node->if_incoming->net_dev->name); + + list_for_each_entry(neigh_node, &orig_node->neigh_list, + list) { + seq_printf(seq, " %pM (%3i)", neigh_node->addr, + neigh_node->tq_avg); + } + + seq_printf(seq, "\n"); + batman_count++; + } + } + + spin_unlock_bh(&bat_priv->orig_hash_lock); + + if ((batman_count == 0)) + seq_printf(seq, "No batman nodes in range ...\n"); + + return 0; +} + +static int orig_node_add_if(struct orig_node *orig_node, int max_if_num) +{ + void *data_ptr; + + data_ptr = kmalloc(max_if_num * sizeof(unsigned long) * NUM_WORDS, + GFP_ATOMIC); + if (!data_ptr) { + pr_err("Can't resize orig: out of memory\n"); + return -1; + } + + memcpy(data_ptr, orig_node->bcast_own, + (max_if_num - 1) * sizeof(unsigned long) * NUM_WORDS); + kfree(orig_node->bcast_own); + orig_node->bcast_own = data_ptr; + + data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); + if (!data_ptr) { + pr_err("Can't resize orig: out of memory\n"); + return -1; + } + + memcpy(data_ptr, orig_node->bcast_own_sum, + (max_if_num - 1) * sizeof(uint8_t)); + kfree(orig_node->bcast_own_sum); + orig_node->bcast_own_sum = data_ptr; + + return 0; +} + +int orig_hash_add_if(struct batman_if *batman_if, int max_if_num) +{ + struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); + struct hashtable_t *hash = bat_priv->orig_hash; + struct hlist_node *walk; + struct hlist_head *head; + struct element_t *bucket; + struct orig_node *orig_node; + int i; + + /* resize all orig nodes because orig_node->bcast_own(_sum) depend on + * if_num */ + spin_lock_bh(&bat_priv->orig_hash_lock); + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + orig_node = bucket->data; + + if (orig_node_add_if(orig_node, max_if_num) == -1) + goto err; + } + } + + spin_unlock_bh(&bat_priv->orig_hash_lock); + return 0; + +err: + spin_unlock_bh(&bat_priv->orig_hash_lock); + return -ENOMEM; +} + +static int orig_node_del_if(struct orig_node *orig_node, + int max_if_num, int del_if_num) +{ + void *data_ptr = NULL; + int chunk_size; + + /* last interface was removed */ + if (max_if_num == 0) + goto free_bcast_own; + + chunk_size = sizeof(unsigned long) * NUM_WORDS; + data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC); + if (!data_ptr) { + pr_err("Can't resize orig: out of memory\n"); + return -1; + } + + /* copy first part */ + memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size); + + /* copy second part */ + memcpy(data_ptr + del_if_num * chunk_size, + orig_node->bcast_own + ((del_if_num + 1) * chunk_size), + (max_if_num - del_if_num) * chunk_size); + +free_bcast_own: + kfree(orig_node->bcast_own); + orig_node->bcast_own = data_ptr; + + if (max_if_num == 0) + goto free_own_sum; + + data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); + if (!data_ptr) { + pr_err("Can't resize orig: out of memory\n"); + return -1; + } + + memcpy(data_ptr, orig_node->bcast_own_sum, + del_if_num * sizeof(uint8_t)); + + memcpy(data_ptr + del_if_num * sizeof(uint8_t), + orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)), + (max_if_num - del_if_num) * sizeof(uint8_t)); + +free_own_sum: + kfree(orig_node->bcast_own_sum); + orig_node->bcast_own_sum = data_ptr; + + return 0; +} + +int orig_hash_del_if(struct batman_if *batman_if, int max_if_num) +{ + struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); + struct hashtable_t *hash = bat_priv->orig_hash; + struct hlist_node *walk; + struct hlist_head *head; + struct element_t *bucket; + struct batman_if *batman_if_tmp; + struct orig_node *orig_node; + int i, ret; + + /* resize all orig nodes because orig_node->bcast_own(_sum) depend on + * if_num */ + spin_lock_bh(&bat_priv->orig_hash_lock); + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + orig_node = bucket->data; + + ret = orig_node_del_if(orig_node, max_if_num, + batman_if->if_num); + + if (ret == -1) + goto err; + } + } + + /* renumber remaining batman interfaces _inside_ of orig_hash_lock */ + rcu_read_lock(); + list_for_each_entry_rcu(batman_if_tmp, &if_list, list) { + if (batman_if_tmp->if_status == IF_NOT_IN_USE) + continue; + + if (batman_if == batman_if_tmp) + continue; + + if (batman_if->soft_iface != batman_if_tmp->soft_iface) + continue; + + if (batman_if_tmp->if_num > batman_if->if_num) + batman_if_tmp->if_num--; + } + rcu_read_unlock(); + + batman_if->if_num = -1; + spin_unlock_bh(&bat_priv->orig_hash_lock); + return 0; + +err: + spin_unlock_bh(&bat_priv->orig_hash_lock); + return -ENOMEM; +} diff --git a/net/batman-adv/originator.h b/net/batman-adv/originator.h new file mode 100644 index 0000000..d474ceb --- /dev/null +++ b/net/batman-adv/originator.h @@ -0,0 +1,64 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_ORIGINATOR_H_ +#define _NET_BATMAN_ADV_ORIGINATOR_H_ + +int originator_init(struct bat_priv *bat_priv); +void originator_free(struct bat_priv *bat_priv); +void purge_orig_ref(struct bat_priv *bat_priv); +struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr); +struct neigh_node * +create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node, + uint8_t *neigh, struct batman_if *if_incoming); +int orig_seq_print_text(struct seq_file *seq, void *offset); +int orig_hash_add_if(struct batman_if *batman_if, int max_if_num); +int orig_hash_del_if(struct batman_if *batman_if, int max_if_num); + + +/* returns 1 if they are the same originator */ +static inline int compare_orig(void *data1, void *data2) +{ + return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); +} + +/* hashfunction to choose an entry in a hash table of given size */ +/* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */ +static inline int choose_orig(void *data, int32_t size) +{ + unsigned char *key = data; + uint32_t hash = 0; + size_t i; + + for (i = 0; i < 6; i++) { + hash += key[i]; + hash += (hash << 10); + hash ^= (hash >> 6); + } + + hash += (hash << 3); + hash ^= (hash >> 11); + hash += (hash << 15); + + return hash % size; +} + +#endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */ diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h new file mode 100644 index 0000000..b49fdf7 --- /dev/null +++ b/net/batman-adv/packet.h @@ -0,0 +1,136 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_PACKET_H_ +#define _NET_BATMAN_ADV_PACKET_H_ + +#define ETH_P_BATMAN 0x4305 /* unofficial/not registered Ethertype */ + +#define BAT_PACKET 0x01 +#define BAT_ICMP 0x02 +#define BAT_UNICAST 0x03 +#define BAT_BCAST 0x04 +#define BAT_VIS 0x05 +#define BAT_UNICAST_FRAG 0x06 + +/* this file is included by batctl which needs these defines */ +#define COMPAT_VERSION 12 +#define DIRECTLINK 0x40 +#define VIS_SERVER 0x20 +#define PRIMARIES_FIRST_HOP 0x10 + +/* ICMP message types */ +#define ECHO_REPLY 0 +#define DESTINATION_UNREACHABLE 3 +#define ECHO_REQUEST 8 +#define TTL_EXCEEDED 11 +#define PARAMETER_PROBLEM 12 + +/* vis defines */ +#define VIS_TYPE_SERVER_SYNC 0 +#define VIS_TYPE_CLIENT_UPDATE 1 + +/* fragmentation defines */ +#define UNI_FRAG_HEAD 0x01 + +struct batman_packet { + uint8_t packet_type; + uint8_t version; /* batman version field */ + uint8_t flags; /* 0x40: DIRECTLINK flag, 0x20 VIS_SERVER flag... */ + uint8_t tq; + uint32_t seqno; + uint8_t orig[6]; + uint8_t prev_sender[6]; + uint8_t ttl; + uint8_t num_hna; + uint8_t gw_flags; /* flags related to gateway class */ + uint8_t align; +} __attribute__((packed)); + +#define BAT_PACKET_LEN sizeof(struct batman_packet) + +struct icmp_packet { + uint8_t packet_type; + uint8_t version; /* batman version field */ + uint8_t msg_type; /* see ICMP message types above */ + uint8_t ttl; + uint8_t dst[6]; + uint8_t orig[6]; + uint16_t seqno; + uint8_t uid; +} __attribute__((packed)); + +#define BAT_RR_LEN 16 + +/* icmp_packet_rr must start with all fields from imcp_packet + * as this is assumed by code that handles ICMP packets */ +struct icmp_packet_rr { + uint8_t packet_type; + uint8_t version; /* batman version field */ + uint8_t msg_type; /* see ICMP message types above */ + uint8_t ttl; + uint8_t dst[6]; + uint8_t orig[6]; + uint16_t seqno; + uint8_t uid; + uint8_t rr_cur; + uint8_t rr[BAT_RR_LEN][ETH_ALEN]; +} __attribute__((packed)); + +struct unicast_packet { + uint8_t packet_type; + uint8_t version; /* batman version field */ + uint8_t dest[6]; + uint8_t ttl; +} __attribute__((packed)); + +struct unicast_frag_packet { + uint8_t packet_type; + uint8_t version; /* batman version field */ + uint8_t dest[6]; + uint8_t ttl; + uint8_t flags; + uint8_t orig[6]; + uint16_t seqno; +} __attribute__((packed)); + +struct bcast_packet { + uint8_t packet_type; + uint8_t version; /* batman version field */ + uint8_t orig[6]; + uint8_t ttl; + uint32_t seqno; +} __attribute__((packed)); + +struct vis_packet { + uint8_t packet_type; + uint8_t version; /* batman version field */ + uint8_t vis_type; /* which type of vis-participant sent this? */ + uint8_t entries; /* number of entries behind this struct */ + uint32_t seqno; /* sequence number */ + uint8_t ttl; /* TTL */ + uint8_t vis_orig[6]; /* originator that informs about its + * neighbors */ + uint8_t target_orig[6]; /* who should receive this packet */ + uint8_t sender_orig[6]; /* who sent or rebroadcasted this packet */ +} __attribute__((packed)); + +#endif /* _NET_BATMAN_ADV_PACKET_H_ */ diff --git a/net/batman-adv/ring_buffer.c b/net/batman-adv/ring_buffer.c new file mode 100644 index 0000000..defd37c --- /dev/null +++ b/net/batman-adv/ring_buffer.c @@ -0,0 +1,52 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "ring_buffer.h" + +void ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, uint8_t value) +{ + lq_recv[*lq_index] = value; + *lq_index = (*lq_index + 1) % TQ_GLOBAL_WINDOW_SIZE; +} + +uint8_t ring_buffer_avg(uint8_t lq_recv[]) +{ + uint8_t *ptr; + uint16_t count = 0, i = 0, sum = 0; + + ptr = lq_recv; + + while (i < TQ_GLOBAL_WINDOW_SIZE) { + if (*ptr != 0) { + count++; + sum += *ptr; + } + + i++; + ptr++; + } + + if (count == 0) + return 0; + + return (uint8_t)(sum / count); +} diff --git a/net/batman-adv/ring_buffer.h b/net/batman-adv/ring_buffer.h new file mode 100644 index 0000000..6b0cb9a --- /dev/null +++ b/net/batman-adv/ring_buffer.h @@ -0,0 +1,28 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_RING_BUFFER_H_ +#define _NET_BATMAN_ADV_RING_BUFFER_H_ + +void ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, uint8_t value); +uint8_t ring_buffer_avg(uint8_t lq_recv[]); + +#endif /* _NET_BATMAN_ADV_RING_BUFFER_H_ */ diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c new file mode 100644 index 0000000..8828edd --- /dev/null +++ b/net/batman-adv/routing.c @@ -0,0 +1,1397 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "routing.h" +#include "send.h" +#include "hash.h" +#include "soft-interface.h" +#include "hard-interface.h" +#include "icmp_socket.h" +#include "translation-table.h" +#include "originator.h" +#include "types.h" +#include "ring_buffer.h" +#include "vis.h" +#include "aggregation.h" +#include "gateway_common.h" +#include "gateway_client.h" +#include "unicast.h" + +void slide_own_bcast_window(struct batman_if *batman_if) +{ + struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); + struct hashtable_t *hash = bat_priv->orig_hash; + struct hlist_node *walk; + struct hlist_head *head; + struct element_t *bucket; + struct orig_node *orig_node; + unsigned long *word; + int i; + size_t word_index; + + spin_lock_bh(&bat_priv->orig_hash_lock); + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + orig_node = bucket->data; + word_index = batman_if->if_num * NUM_WORDS; + word = &(orig_node->bcast_own[word_index]); + + bit_get_packet(bat_priv, word, 1, 0); + orig_node->bcast_own_sum[batman_if->if_num] = + bit_packet_count(word); + } + } + + spin_unlock_bh(&bat_priv->orig_hash_lock); +} + +static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node, + unsigned char *hna_buff, int hna_buff_len) +{ + if ((hna_buff_len != orig_node->hna_buff_len) || + ((hna_buff_len > 0) && + (orig_node->hna_buff_len > 0) && + (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) { + + if (orig_node->hna_buff_len > 0) + hna_global_del_orig(bat_priv, orig_node, + "originator changed hna"); + + if ((hna_buff_len > 0) && (hna_buff)) + hna_global_add_orig(bat_priv, orig_node, + hna_buff, hna_buff_len); + } +} + +static void update_route(struct bat_priv *bat_priv, + struct orig_node *orig_node, + struct neigh_node *neigh_node, + unsigned char *hna_buff, int hna_buff_len) +{ + /* route deleted */ + if ((orig_node->router) && (!neigh_node)) { + + bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", + orig_node->orig); + hna_global_del_orig(bat_priv, orig_node, + "originator timed out"); + + /* route added */ + } else if ((!orig_node->router) && (neigh_node)) { + + bat_dbg(DBG_ROUTES, bat_priv, + "Adding route towards: %pM (via %pM)\n", + orig_node->orig, neigh_node->addr); + hna_global_add_orig(bat_priv, orig_node, + hna_buff, hna_buff_len); + + /* route changed */ + } else { + bat_dbg(DBG_ROUTES, bat_priv, + "Changing route towards: %pM " + "(now via %pM - was via %pM)\n", + orig_node->orig, neigh_node->addr, + orig_node->router->addr); + } + + orig_node->router = neigh_node; +} + + +void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node, + struct neigh_node *neigh_node, unsigned char *hna_buff, + int hna_buff_len) +{ + + if (!orig_node) + return; + + if (orig_node->router != neigh_node) + update_route(bat_priv, orig_node, neigh_node, + hna_buff, hna_buff_len); + /* may be just HNA changed */ + else + update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len); +} + +static int is_bidirectional_neigh(struct orig_node *orig_node, + struct orig_node *orig_neigh_node, + struct batman_packet *batman_packet, + struct batman_if *if_incoming) +{ + struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; + unsigned char total_count; + + if (orig_node == orig_neigh_node) { + list_for_each_entry(tmp_neigh_node, + &orig_node->neigh_list, + list) { + + if (compare_orig(tmp_neigh_node->addr, + orig_neigh_node->orig) && + (tmp_neigh_node->if_incoming == if_incoming)) + neigh_node = tmp_neigh_node; + } + + if (!neigh_node) + neigh_node = create_neighbor(orig_node, + orig_neigh_node, + orig_neigh_node->orig, + if_incoming); + /* create_neighbor failed, return 0 */ + if (!neigh_node) + return 0; + + neigh_node->last_valid = jiffies; + } else { + /* find packet count of corresponding one hop neighbor */ + list_for_each_entry(tmp_neigh_node, + &orig_neigh_node->neigh_list, list) { + + if (compare_orig(tmp_neigh_node->addr, + orig_neigh_node->orig) && + (tmp_neigh_node->if_incoming == if_incoming)) + neigh_node = tmp_neigh_node; + } + + if (!neigh_node) + neigh_node = create_neighbor(orig_neigh_node, + orig_neigh_node, + orig_neigh_node->orig, + if_incoming); + /* create_neighbor failed, return 0 */ + if (!neigh_node) + return 0; + } + + orig_node->last_valid = jiffies; + + /* pay attention to not get a value bigger than 100 % */ + total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] > + neigh_node->real_packet_count ? + neigh_node->real_packet_count : + orig_neigh_node->bcast_own_sum[if_incoming->if_num]); + + /* if we have too few packets (too less data) we set tq_own to zero */ + /* if we receive too few packets it is not considered bidirectional */ + if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || + (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) + orig_neigh_node->tq_own = 0; + else + /* neigh_node->real_packet_count is never zero as we + * only purge old information when getting new + * information */ + orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) / + neigh_node->real_packet_count; + + /* + * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does + * affect the nearly-symmetric links only a little, but + * punishes asymmetric links more. This will give a value + * between 0 and TQ_MAX_VALUE + */ + orig_neigh_node->tq_asym_penalty = + TQ_MAX_VALUE - + (TQ_MAX_VALUE * + (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * + (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * + (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) / + (TQ_LOCAL_WINDOW_SIZE * + TQ_LOCAL_WINDOW_SIZE * + TQ_LOCAL_WINDOW_SIZE); + + batman_packet->tq = ((batman_packet->tq * + orig_neigh_node->tq_own * + orig_neigh_node->tq_asym_penalty) / + (TQ_MAX_VALUE * TQ_MAX_VALUE)); + + bat_dbg(DBG_BATMAN, bat_priv, + "bidirectional: " + "orig = %-15pM neigh = %-15pM => own_bcast = %2i, " + "real recv = %2i, local tq: %3i, asym_penalty: %3i, " + "total tq: %3i\n", + orig_node->orig, orig_neigh_node->orig, total_count, + neigh_node->real_packet_count, orig_neigh_node->tq_own, + orig_neigh_node->tq_asym_penalty, batman_packet->tq); + + /* if link has the minimum required transmission quality + * consider it bidirectional */ + if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) + return 1; + + return 0; +} + +static void update_orig(struct bat_priv *bat_priv, + struct orig_node *orig_node, + struct ethhdr *ethhdr, + struct batman_packet *batman_packet, + struct batman_if *if_incoming, + unsigned char *hna_buff, int hna_buff_len, + char is_duplicate) +{ + struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; + int tmp_hna_buff_len; + + bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): " + "Searching and updating originator entry of received packet\n"); + + list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { + if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && + (tmp_neigh_node->if_incoming == if_incoming)) { + neigh_node = tmp_neigh_node; + continue; + } + + if (is_duplicate) + continue; + + ring_buffer_set(tmp_neigh_node->tq_recv, + &tmp_neigh_node->tq_index, 0); + tmp_neigh_node->tq_avg = + ring_buffer_avg(tmp_neigh_node->tq_recv); + } + + if (!neigh_node) { + struct orig_node *orig_tmp; + + orig_tmp = get_orig_node(bat_priv, ethhdr->h_source); + if (!orig_tmp) + return; + + neigh_node = create_neighbor(orig_node, orig_tmp, + ethhdr->h_source, if_incoming); + if (!neigh_node) + return; + } else + bat_dbg(DBG_BATMAN, bat_priv, + "Updating existing last-hop neighbor of originator\n"); + + orig_node->flags = batman_packet->flags; + neigh_node->last_valid = jiffies; + + ring_buffer_set(neigh_node->tq_recv, + &neigh_node->tq_index, + batman_packet->tq); + neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); + + if (!is_duplicate) { + orig_node->last_ttl = batman_packet->ttl; + neigh_node->last_ttl = batman_packet->ttl; + } + + tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ? + batman_packet->num_hna * ETH_ALEN : hna_buff_len); + + /* if this neighbor already is our next hop there is nothing + * to change */ + if (orig_node->router == neigh_node) + goto update_hna; + + /* if this neighbor does not offer a better TQ we won't consider it */ + if ((orig_node->router) && + (orig_node->router->tq_avg > neigh_node->tq_avg)) + goto update_hna; + + /* if the TQ is the same and the link not more symetric we + * won't consider it either */ + if ((orig_node->router) && + ((neigh_node->tq_avg == orig_node->router->tq_avg) && + (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num] + >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num]))) + goto update_hna; + + update_routes(bat_priv, orig_node, neigh_node, + hna_buff, tmp_hna_buff_len); + goto update_gw; + +update_hna: + update_routes(bat_priv, orig_node, orig_node->router, + hna_buff, tmp_hna_buff_len); + +update_gw: + if (orig_node->gw_flags != batman_packet->gw_flags) + gw_node_update(bat_priv, orig_node, batman_packet->gw_flags); + + orig_node->gw_flags = batman_packet->gw_flags; + + /* restart gateway selection if fast or late switching was enabled */ + if ((orig_node->gw_flags) && + (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && + (atomic_read(&bat_priv->gw_sel_class) > 2)) + gw_check_election(bat_priv, orig_node); +} + +/* checks whether the host restarted and is in the protection time. + * returns: + * 0 if the packet is to be accepted + * 1 if the packet is to be ignored. + */ +static int window_protected(struct bat_priv *bat_priv, + int32_t seq_num_diff, + unsigned long *last_reset) +{ + if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) + || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { + if (time_after(jiffies, *last_reset + + msecs_to_jiffies(RESET_PROTECTION_MS))) { + + *last_reset = jiffies; + bat_dbg(DBG_BATMAN, bat_priv, + "old packet received, start protection\n"); + + return 0; + } else + return 1; + } + return 0; +} + +/* processes a batman packet for all interfaces, adjusts the sequence number and + * finds out whether it is a duplicate. + * returns: + * 1 the packet is a duplicate + * 0 the packet has not yet been received + * -1 the packet is old and has been received while the seqno window + * was protected. Caller should drop it. + */ +static char count_real_packets(struct ethhdr *ethhdr, + struct batman_packet *batman_packet, + struct batman_if *if_incoming) +{ + struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct orig_node *orig_node; + struct neigh_node *tmp_neigh_node; + char is_duplicate = 0; + int32_t seq_diff; + int need_update = 0; + int set_mark; + + orig_node = get_orig_node(bat_priv, batman_packet->orig); + if (!orig_node) + return 0; + + seq_diff = batman_packet->seqno - orig_node->last_real_seqno; + + /* signalize caller that the packet is to be dropped. */ + if (window_protected(bat_priv, seq_diff, + &orig_node->batman_seqno_reset)) + return -1; + + list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { + + is_duplicate |= get_bit_status(tmp_neigh_node->real_bits, + orig_node->last_real_seqno, + batman_packet->seqno); + + if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && + (tmp_neigh_node->if_incoming == if_incoming)) + set_mark = 1; + else + set_mark = 0; + + /* if the window moved, set the update flag. */ + need_update |= bit_get_packet(bat_priv, + tmp_neigh_node->real_bits, + seq_diff, set_mark); + + tmp_neigh_node->real_packet_count = + bit_packet_count(tmp_neigh_node->real_bits); + } + + if (need_update) { + bat_dbg(DBG_BATMAN, bat_priv, + "updating last_seqno: old %d, new %d\n", + orig_node->last_real_seqno, batman_packet->seqno); + orig_node->last_real_seqno = batman_packet->seqno; + } + + return is_duplicate; +} + +/* copy primary address for bonding */ +static void mark_bonding_address(struct bat_priv *bat_priv, + struct orig_node *orig_node, + struct orig_node *orig_neigh_node, + struct batman_packet *batman_packet) + +{ + if (batman_packet->flags & PRIMARIES_FIRST_HOP) + memcpy(orig_neigh_node->primary_addr, + orig_node->orig, ETH_ALEN); + + return; +} + +/* mark possible bond.candidates in the neighbor list */ +void update_bonding_candidates(struct bat_priv *bat_priv, + struct orig_node *orig_node) +{ + int candidates; + int interference_candidate; + int best_tq; + struct neigh_node *tmp_neigh_node, *tmp_neigh_node2; + struct neigh_node *first_candidate, *last_candidate; + + /* update the candidates for this originator */ + if (!orig_node->router) { + orig_node->bond.candidates = 0; + return; + } + + best_tq = orig_node->router->tq_avg; + + /* update bond.candidates */ + + candidates = 0; + + /* mark other nodes which also received "PRIMARIES FIRST HOP" packets + * as "bonding partner" */ + + /* first, zero the list */ + list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { + tmp_neigh_node->next_bond_candidate = NULL; + } + + first_candidate = NULL; + last_candidate = NULL; + list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { + + /* only consider if it has the same primary address ... */ + if (memcmp(orig_node->orig, + tmp_neigh_node->orig_node->primary_addr, + ETH_ALEN) != 0) + continue; + + /* ... and is good enough to be considered */ + if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD) + continue; + + /* check if we have another candidate with the same + * mac address or interface. If we do, we won't + * select this candidate because of possible interference. */ + + interference_candidate = 0; + list_for_each_entry(tmp_neigh_node2, + &orig_node->neigh_list, list) { + + if (tmp_neigh_node2 == tmp_neigh_node) + continue; + + /* we only care if the other candidate is even + * considered as candidate. */ + if (!tmp_neigh_node2->next_bond_candidate) + continue; + + + if ((tmp_neigh_node->if_incoming == + tmp_neigh_node2->if_incoming) + || (memcmp(tmp_neigh_node->addr, + tmp_neigh_node2->addr, ETH_ALEN) == 0)) { + + interference_candidate = 1; + break; + } + } + /* don't care further if it is an interference candidate */ + if (interference_candidate) + continue; + + if (!first_candidate) { + first_candidate = tmp_neigh_node; + tmp_neigh_node->next_bond_candidate = first_candidate; + } else + tmp_neigh_node->next_bond_candidate = last_candidate; + + last_candidate = tmp_neigh_node; + + candidates++; + } + + if (candidates > 0) { + first_candidate->next_bond_candidate = last_candidate; + orig_node->bond.selected = first_candidate; + } + + orig_node->bond.candidates = candidates; +} + +void receive_bat_packet(struct ethhdr *ethhdr, + struct batman_packet *batman_packet, + unsigned char *hna_buff, int hna_buff_len, + struct batman_if *if_incoming) +{ + struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batman_if *batman_if; + struct orig_node *orig_neigh_node, *orig_node; + char has_directlink_flag; + char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; + char is_broadcast = 0, is_bidirectional, is_single_hop_neigh; + char is_duplicate; + uint32_t if_incoming_seqno; + + /* Silently drop when the batman packet is actually not a + * correct packet. + * + * This might happen if a packet is padded (e.g. Ethernet has a + * minimum frame length of 64 byte) and the aggregation interprets + * it as an additional length. + * + * TODO: A more sane solution would be to have a bit in the + * batman_packet to detect whether the packet is the last + * packet in an aggregation. Here we expect that the padding + * is always zero (or not 0x01) + */ + if (batman_packet->packet_type != BAT_PACKET) + return; + + /* could be changed by schedule_own_packet() */ + if_incoming_seqno = atomic_read(&if_incoming->seqno); + + has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); + + is_single_hop_neigh = (compare_orig(ethhdr->h_source, + batman_packet->orig) ? 1 : 0); + + bat_dbg(DBG_BATMAN, bat_priv, + "Received BATMAN packet via NB: %pM, IF: %s [%pM] " + "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, " + "TTL %d, V %d, IDF %d)\n", + ethhdr->h_source, if_incoming->net_dev->name, + if_incoming->net_dev->dev_addr, batman_packet->orig, + batman_packet->prev_sender, batman_packet->seqno, + batman_packet->tq, batman_packet->ttl, batman_packet->version, + has_directlink_flag); + + rcu_read_lock(); + list_for_each_entry_rcu(batman_if, &if_list, list) { + if (batman_if->if_status != IF_ACTIVE) + continue; + + if (batman_if->soft_iface != if_incoming->soft_iface) + continue; + + if (compare_orig(ethhdr->h_source, + batman_if->net_dev->dev_addr)) + is_my_addr = 1; + + if (compare_orig(batman_packet->orig, + batman_if->net_dev->dev_addr)) + is_my_orig = 1; + + if (compare_orig(batman_packet->prev_sender, + batman_if->net_dev->dev_addr)) + is_my_oldorig = 1; + + if (compare_orig(ethhdr->h_source, broadcast_addr)) + is_broadcast = 1; + } + rcu_read_unlock(); + + if (batman_packet->version != COMPAT_VERSION) { + bat_dbg(DBG_BATMAN, bat_priv, + "Drop packet: incompatible batman version (%i)\n", + batman_packet->version); + return; + } + + if (is_my_addr) { + bat_dbg(DBG_BATMAN, bat_priv, + "Drop packet: received my own broadcast (sender: %pM" + ")\n", + ethhdr->h_source); + return; + } + + if (is_broadcast) { + bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " + "ignoring all packets with broadcast source addr (sender: %pM" + ")\n", ethhdr->h_source); + return; + } + + if (is_my_orig) { + unsigned long *word; + int offset; + + orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source); + + if (!orig_neigh_node) + return; + + /* neighbor has to indicate direct link and it has to + * come via the corresponding interface */ + /* if received seqno equals last send seqno save new + * seqno for bidirectional check */ + if (has_directlink_flag && + compare_orig(if_incoming->net_dev->dev_addr, + batman_packet->orig) && + (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { + offset = if_incoming->if_num * NUM_WORDS; + word = &(orig_neigh_node->bcast_own[offset]); + bit_mark(word, 0); + orig_neigh_node->bcast_own_sum[if_incoming->if_num] = + bit_packet_count(word); + } + + bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " + "originator packet from myself (via neighbor)\n"); + return; + } + + if (is_my_oldorig) { + bat_dbg(DBG_BATMAN, bat_priv, + "Drop packet: ignoring all rebroadcast echos (sender: " + "%pM)\n", ethhdr->h_source); + return; + } + + orig_node = get_orig_node(bat_priv, batman_packet->orig); + if (!orig_node) + return; + + is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); + + if (is_duplicate == -1) { + bat_dbg(DBG_BATMAN, bat_priv, + "Drop packet: packet within seqno protection time " + "(sender: %pM)\n", ethhdr->h_source); + return; + } + + if (batman_packet->tq == 0) { + bat_dbg(DBG_BATMAN, bat_priv, + "Drop packet: originator packet with tq equal 0\n"); + return; + } + + /* avoid temporary routing loops */ + if ((orig_node->router) && + (orig_node->router->orig_node->router) && + (compare_orig(orig_node->router->addr, + batman_packet->prev_sender)) && + !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) && + (compare_orig(orig_node->router->addr, + orig_node->router->orig_node->router->addr))) { + bat_dbg(DBG_BATMAN, bat_priv, + "Drop packet: ignoring all rebroadcast packets that " + "may make me loop (sender: %pM)\n", ethhdr->h_source); + return; + } + + /* if sender is a direct neighbor the sender mac equals + * originator mac */ + orig_neigh_node = (is_single_hop_neigh ? + orig_node : + get_orig_node(bat_priv, ethhdr->h_source)); + if (!orig_neigh_node) + return; + + /* drop packet if sender is not a direct neighbor and if we + * don't route towards it */ + if (!is_single_hop_neigh && (!orig_neigh_node->router)) { + bat_dbg(DBG_BATMAN, bat_priv, + "Drop packet: OGM via unknown neighbor!\n"); + return; + } + + is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node, + batman_packet, if_incoming); + + /* update ranking if it is not a duplicate or has the same + * seqno and similar ttl as the non-duplicate */ + if (is_bidirectional && + (!is_duplicate || + ((orig_node->last_real_seqno == batman_packet->seqno) && + (orig_node->last_ttl - 3 <= batman_packet->ttl)))) + update_orig(bat_priv, orig_node, ethhdr, batman_packet, + if_incoming, hna_buff, hna_buff_len, is_duplicate); + + mark_bonding_address(bat_priv, orig_node, + orig_neigh_node, batman_packet); + update_bonding_candidates(bat_priv, orig_node); + + /* is single hop (direct) neighbor */ + if (is_single_hop_neigh) { + + /* mark direct link on incoming interface */ + schedule_forward_packet(orig_node, ethhdr, batman_packet, + 1, hna_buff_len, if_incoming); + + bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: " + "rebroadcast neighbor packet with direct link flag\n"); + return; + } + + /* multihop originator */ + if (!is_bidirectional) { + bat_dbg(DBG_BATMAN, bat_priv, + "Drop packet: not received via bidirectional link\n"); + return; + } + + if (is_duplicate) { + bat_dbg(DBG_BATMAN, bat_priv, + "Drop packet: duplicate packet received\n"); + return; + } + + bat_dbg(DBG_BATMAN, bat_priv, + "Forwarding packet: rebroadcast originator packet\n"); + schedule_forward_packet(orig_node, ethhdr, batman_packet, + 0, hna_buff_len, if_incoming); +} + +int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if) +{ + struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); + struct ethhdr *ethhdr; + + /* drop packet if it has not necessary minimum size */ + if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet)))) + return NET_RX_DROP; + + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + /* packet with broadcast indication but unicast recipient */ + if (!is_broadcast_ether_addr(ethhdr->h_dest)) + return NET_RX_DROP; + + /* packet with broadcast sender address */ + if (is_broadcast_ether_addr(ethhdr->h_source)) + return NET_RX_DROP; + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, 0) < 0) + return NET_RX_DROP; + + /* keep skb linear */ + if (skb_linearize(skb) < 0) + return NET_RX_DROP; + + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + spin_lock_bh(&bat_priv->orig_hash_lock); + receive_aggr_bat_packet(ethhdr, + skb->data, + skb_headlen(skb), + batman_if); + spin_unlock_bh(&bat_priv->orig_hash_lock); + + kfree_skb(skb); + return NET_RX_SUCCESS; +} + +static int recv_my_icmp_packet(struct bat_priv *bat_priv, + struct sk_buff *skb, size_t icmp_len) +{ + struct orig_node *orig_node; + struct icmp_packet_rr *icmp_packet; + struct ethhdr *ethhdr; + struct batman_if *batman_if; + int ret; + uint8_t dstaddr[ETH_ALEN]; + + icmp_packet = (struct icmp_packet_rr *)skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + /* add data to device queue */ + if (icmp_packet->msg_type != ECHO_REQUEST) { + bat_socket_receive_packet(icmp_packet, icmp_len); + return NET_RX_DROP; + } + + if (!bat_priv->primary_if) + return NET_RX_DROP; + + /* answer echo request (ping) */ + /* get routing information */ + spin_lock_bh(&bat_priv->orig_hash_lock); + orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash, + compare_orig, choose_orig, + icmp_packet->orig)); + ret = NET_RX_DROP; + + if ((orig_node) && (orig_node->router)) { + + /* don't lock while sending the packets ... we therefore + * copy the required data before sending */ + batman_if = orig_node->router->if_incoming; + memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); + spin_unlock_bh(&bat_priv->orig_hash_lock); + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, sizeof(struct ethhdr)) < 0) + return NET_RX_DROP; + + icmp_packet = (struct icmp_packet_rr *)skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); + memcpy(icmp_packet->orig, + bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); + icmp_packet->msg_type = ECHO_REPLY; + icmp_packet->ttl = TTL; + + send_skb_packet(skb, batman_if, dstaddr); + ret = NET_RX_SUCCESS; + + } else + spin_unlock_bh(&bat_priv->orig_hash_lock); + + return ret; +} + +static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, + struct sk_buff *skb, size_t icmp_len) +{ + struct orig_node *orig_node; + struct icmp_packet *icmp_packet; + struct ethhdr *ethhdr; + struct batman_if *batman_if; + int ret; + uint8_t dstaddr[ETH_ALEN]; + + icmp_packet = (struct icmp_packet *)skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + /* send TTL exceeded if packet is an echo request (traceroute) */ + if (icmp_packet->msg_type != ECHO_REQUEST) { + pr_debug("Warning - can't forward icmp packet from %pM to " + "%pM: ttl exceeded\n", icmp_packet->orig, + icmp_packet->dst); + return NET_RX_DROP; + } + + if (!bat_priv->primary_if) + return NET_RX_DROP; + + /* get routing information */ + spin_lock_bh(&bat_priv->orig_hash_lock); + orig_node = ((struct orig_node *) + hash_find(bat_priv->orig_hash, compare_orig, choose_orig, + icmp_packet->orig)); + ret = NET_RX_DROP; + + if ((orig_node) && (orig_node->router)) { + + /* don't lock while sending the packets ... we therefore + * copy the required data before sending */ + batman_if = orig_node->router->if_incoming; + memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); + spin_unlock_bh(&bat_priv->orig_hash_lock); + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, sizeof(struct ethhdr)) < 0) + return NET_RX_DROP; + + icmp_packet = (struct icmp_packet *) skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); + memcpy(icmp_packet->orig, + bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); + icmp_packet->msg_type = TTL_EXCEEDED; + icmp_packet->ttl = TTL; + + send_skb_packet(skb, batman_if, dstaddr); + ret = NET_RX_SUCCESS; + + } else + spin_unlock_bh(&bat_priv->orig_hash_lock); + + return ret; +} + + +int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if) +{ + struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct icmp_packet_rr *icmp_packet; + struct ethhdr *ethhdr; + struct orig_node *orig_node; + struct batman_if *batman_if; + int hdr_size = sizeof(struct icmp_packet); + int ret; + uint8_t dstaddr[ETH_ALEN]; + + /** + * we truncate all incoming icmp packets if they don't match our size + */ + if (skb->len >= sizeof(struct icmp_packet_rr)) + hdr_size = sizeof(struct icmp_packet_rr); + + /* drop packet if it has not necessary minimum size */ + if (unlikely(!pskb_may_pull(skb, hdr_size))) + return NET_RX_DROP; + + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + /* packet with unicast indication but broadcast recipient */ + if (is_broadcast_ether_addr(ethhdr->h_dest)) + return NET_RX_DROP; + + /* packet with broadcast sender address */ + if (is_broadcast_ether_addr(ethhdr->h_source)) + return NET_RX_DROP; + + /* not for me */ + if (!is_my_mac(ethhdr->h_dest)) + return NET_RX_DROP; + + icmp_packet = (struct icmp_packet_rr *)skb->data; + + /* add record route information if not full */ + if ((hdr_size == sizeof(struct icmp_packet_rr)) && + (icmp_packet->rr_cur < BAT_RR_LEN)) { + memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), + ethhdr->h_dest, ETH_ALEN); + icmp_packet->rr_cur++; + } + + /* packet for me */ + if (is_my_mac(icmp_packet->dst)) + return recv_my_icmp_packet(bat_priv, skb, hdr_size); + + /* TTL exceeded */ + if (icmp_packet->ttl < 2) + return recv_icmp_ttl_exceeded(bat_priv, skb, hdr_size); + + ret = NET_RX_DROP; + + /* get routing information */ + spin_lock_bh(&bat_priv->orig_hash_lock); + orig_node = ((struct orig_node *) + hash_find(bat_priv->orig_hash, compare_orig, choose_orig, + icmp_packet->dst)); + + if ((orig_node) && (orig_node->router)) { + + /* don't lock while sending the packets ... we therefore + * copy the required data before sending */ + batman_if = orig_node->router->if_incoming; + memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); + spin_unlock_bh(&bat_priv->orig_hash_lock); + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, sizeof(struct ethhdr)) < 0) + return NET_RX_DROP; + + icmp_packet = (struct icmp_packet_rr *)skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + /* decrement ttl */ + icmp_packet->ttl--; + + /* route it */ + send_skb_packet(skb, batman_if, dstaddr); + ret = NET_RX_SUCCESS; + + } else + spin_unlock_bh(&bat_priv->orig_hash_lock); + + return ret; +} + +/* find a suitable router for this originator, and use + * bonding if possible. */ +struct neigh_node *find_router(struct bat_priv *bat_priv, + struct orig_node *orig_node, + struct batman_if *recv_if) +{ + struct orig_node *primary_orig_node; + struct orig_node *router_orig; + struct neigh_node *router, *first_candidate, *best_router; + static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; + int bonding_enabled; + + if (!orig_node) + return NULL; + + if (!orig_node->router) + return NULL; + + /* without bonding, the first node should + * always choose the default router. */ + + bonding_enabled = atomic_read(&bat_priv->bonding); + + if ((!recv_if) && (!bonding_enabled)) + return orig_node->router; + + router_orig = orig_node->router->orig_node; + + /* if we have something in the primary_addr, we can search + * for a potential bonding candidate. */ + if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0) + return orig_node->router; + + /* find the orig_node which has the primary interface. might + * even be the same as our router_orig in many cases */ + + if (memcmp(router_orig->primary_addr, + router_orig->orig, ETH_ALEN) == 0) { + primary_orig_node = router_orig; + } else { + primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig, + choose_orig, + router_orig->primary_addr); + + if (!primary_orig_node) + return orig_node->router; + } + + /* with less than 2 candidates, we can't do any + * bonding and prefer the original router. */ + + if (primary_orig_node->bond.candidates < 2) + return orig_node->router; + + + /* all nodes between should choose a candidate which + * is is not on the interface where the packet came + * in. */ + first_candidate = primary_orig_node->bond.selected; + router = first_candidate; + + if (bonding_enabled) { + /* in the bonding case, send the packets in a round + * robin fashion over the remaining interfaces. */ + do { + /* recv_if == NULL on the first node. */ + if (router->if_incoming != recv_if) + break; + + router = router->next_bond_candidate; + } while (router != first_candidate); + + primary_orig_node->bond.selected = router->next_bond_candidate; + + } else { + /* if bonding is disabled, use the best of the + * remaining candidates which are not using + * this interface. */ + best_router = first_candidate; + + do { + /* recv_if == NULL on the first node. */ + if ((router->if_incoming != recv_if) && + (router->tq_avg > best_router->tq_avg)) + best_router = router; + + router = router->next_bond_candidate; + } while (router != first_candidate); + + router = best_router; + } + + return router; +} + +static int check_unicast_packet(struct sk_buff *skb, int hdr_size) +{ + struct ethhdr *ethhdr; + + /* drop packet if it has not necessary minimum size */ + if (unlikely(!pskb_may_pull(skb, hdr_size))) + return -1; + + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + /* packet with unicast indication but broadcast recipient */ + if (is_broadcast_ether_addr(ethhdr->h_dest)) + return -1; + + /* packet with broadcast sender address */ + if (is_broadcast_ether_addr(ethhdr->h_source)) + return -1; + + /* not for me */ + if (!is_my_mac(ethhdr->h_dest)) + return -1; + + return 0; +} + +int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if, + int hdr_size) +{ + struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct orig_node *orig_node; + struct neigh_node *router; + struct batman_if *batman_if; + uint8_t dstaddr[ETH_ALEN]; + struct unicast_packet *unicast_packet; + struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); + int ret; + struct sk_buff *new_skb; + + unicast_packet = (struct unicast_packet *)skb->data; + + /* TTL exceeded */ + if (unicast_packet->ttl < 2) { + pr_debug("Warning - can't forward unicast packet from %pM to " + "%pM: ttl exceeded\n", ethhdr->h_source, + unicast_packet->dest); + return NET_RX_DROP; + } + + /* get routing information */ + spin_lock_bh(&bat_priv->orig_hash_lock); + orig_node = ((struct orig_node *) + hash_find(bat_priv->orig_hash, compare_orig, choose_orig, + unicast_packet->dest)); + + router = find_router(bat_priv, orig_node, recv_if); + + if (!router) { + spin_unlock_bh(&bat_priv->orig_hash_lock); + return NET_RX_DROP; + } + + /* don't lock while sending the packets ... we therefore + * copy the required data before sending */ + + batman_if = router->if_incoming; + memcpy(dstaddr, router->addr, ETH_ALEN); + + spin_unlock_bh(&bat_priv->orig_hash_lock); + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, sizeof(struct ethhdr)) < 0) + return NET_RX_DROP; + + unicast_packet = (struct unicast_packet *)skb->data; + + if (unicast_packet->packet_type == BAT_UNICAST && + atomic_read(&bat_priv->fragmentation) && + skb->len > batman_if->net_dev->mtu) + return frag_send_skb(skb, bat_priv, batman_if, + dstaddr); + + if (unicast_packet->packet_type == BAT_UNICAST_FRAG && + 2 * skb->len - hdr_size <= batman_if->net_dev->mtu) { + + ret = frag_reassemble_skb(skb, bat_priv, &new_skb); + + if (ret == NET_RX_DROP) + return NET_RX_DROP; + + /* packet was buffered for late merge */ + if (!new_skb) + return NET_RX_SUCCESS; + + skb = new_skb; + unicast_packet = (struct unicast_packet *)skb->data; + } + + /* decrement ttl */ + unicast_packet->ttl--; + + /* route it */ + send_skb_packet(skb, batman_if, dstaddr); + + return NET_RX_SUCCESS; +} + +int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if) +{ + struct unicast_packet *unicast_packet; + int hdr_size = sizeof(struct unicast_packet); + + if (check_unicast_packet(skb, hdr_size) < 0) + return NET_RX_DROP; + + unicast_packet = (struct unicast_packet *)skb->data; + + /* packet for me */ + if (is_my_mac(unicast_packet->dest)) { + interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); + return NET_RX_SUCCESS; + } + + return route_unicast_packet(skb, recv_if, hdr_size); +} + +int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if) +{ + struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct unicast_frag_packet *unicast_packet; + int hdr_size = sizeof(struct unicast_frag_packet); + struct sk_buff *new_skb = NULL; + int ret; + + if (check_unicast_packet(skb, hdr_size) < 0) + return NET_RX_DROP; + + unicast_packet = (struct unicast_frag_packet *)skb->data; + + /* packet for me */ + if (is_my_mac(unicast_packet->dest)) { + + ret = frag_reassemble_skb(skb, bat_priv, &new_skb); + + if (ret == NET_RX_DROP) + return NET_RX_DROP; + + /* packet was buffered for late merge */ + if (!new_skb) + return NET_RX_SUCCESS; + + interface_rx(recv_if->soft_iface, new_skb, recv_if, + sizeof(struct unicast_packet)); + return NET_RX_SUCCESS; + } + + return route_unicast_packet(skb, recv_if, hdr_size); +} + + +int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if) +{ + struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct orig_node *orig_node; + struct bcast_packet *bcast_packet; + struct ethhdr *ethhdr; + int hdr_size = sizeof(struct bcast_packet); + int32_t seq_diff; + + /* drop packet if it has not necessary minimum size */ + if (unlikely(!pskb_may_pull(skb, hdr_size))) + return NET_RX_DROP; + + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + /* packet with broadcast indication but unicast recipient */ + if (!is_broadcast_ether_addr(ethhdr->h_dest)) + return NET_RX_DROP; + + /* packet with broadcast sender address */ + if (is_broadcast_ether_addr(ethhdr->h_source)) + return NET_RX_DROP; + + /* ignore broadcasts sent by myself */ + if (is_my_mac(ethhdr->h_source)) + return NET_RX_DROP; + + bcast_packet = (struct bcast_packet *)skb->data; + + /* ignore broadcasts originated by myself */ + if (is_my_mac(bcast_packet->orig)) + return NET_RX_DROP; + + if (bcast_packet->ttl < 2) + return NET_RX_DROP; + + spin_lock_bh(&bat_priv->orig_hash_lock); + orig_node = ((struct orig_node *) + hash_find(bat_priv->orig_hash, compare_orig, choose_orig, + bcast_packet->orig)); + + if (!orig_node) { + spin_unlock_bh(&bat_priv->orig_hash_lock); + return NET_RX_DROP; + } + + /* check whether the packet is a duplicate */ + if (get_bit_status(orig_node->bcast_bits, + orig_node->last_bcast_seqno, + ntohl(bcast_packet->seqno))) { + spin_unlock_bh(&bat_priv->orig_hash_lock); + return NET_RX_DROP; + } + + seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; + + /* check whether the packet is old and the host just restarted. */ + if (window_protected(bat_priv, seq_diff, + &orig_node->bcast_seqno_reset)) { + spin_unlock_bh(&bat_priv->orig_hash_lock); + return NET_RX_DROP; + } + + /* mark broadcast in flood history, update window position + * if required. */ + if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) + orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); + + spin_unlock_bh(&bat_priv->orig_hash_lock); + /* rebroadcast packet */ + add_bcast_packet_to_list(bat_priv, skb); + + /* broadcast for me */ + interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); + + return NET_RX_SUCCESS; +} + +int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if) +{ + struct vis_packet *vis_packet; + struct ethhdr *ethhdr; + struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); + int hdr_size = sizeof(struct vis_packet); + + /* keep skb linear */ + if (skb_linearize(skb) < 0) + return NET_RX_DROP; + + if (unlikely(!pskb_may_pull(skb, hdr_size))) + return NET_RX_DROP; + + vis_packet = (struct vis_packet *)skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + /* not for me */ + if (!is_my_mac(ethhdr->h_dest)) + return NET_RX_DROP; + + /* ignore own packets */ + if (is_my_mac(vis_packet->vis_orig)) + return NET_RX_DROP; + + if (is_my_mac(vis_packet->sender_orig)) + return NET_RX_DROP; + + switch (vis_packet->vis_type) { + case VIS_TYPE_SERVER_SYNC: + receive_server_sync_packet(bat_priv, vis_packet, + skb_headlen(skb)); + break; + + case VIS_TYPE_CLIENT_UPDATE: + receive_client_update_packet(bat_priv, vis_packet, + skb_headlen(skb)); + break; + + default: /* ignore unknown packet */ + break; + } + + /* We take a copy of the data in the packet, so we should + always free the skbuf. */ + return NET_RX_DROP; +} diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h new file mode 100644 index 0000000..f108f23 --- /dev/null +++ b/net/batman-adv/routing.h @@ -0,0 +1,48 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_ROUTING_H_ +#define _NET_BATMAN_ADV_ROUTING_H_ + +#include "types.h" + +void slide_own_bcast_window(struct batman_if *batman_if); +void receive_bat_packet(struct ethhdr *ethhdr, + struct batman_packet *batman_packet, + unsigned char *hna_buff, int hna_buff_len, + struct batman_if *if_incoming); +void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node, + struct neigh_node *neigh_node, unsigned char *hna_buff, + int hna_buff_len); +int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if, + int hdr_size); +int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if); +int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if); +int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if); +int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if); +int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if); +int recv_bat_packet(struct sk_buff *skb, struct batman_if *recv_if); +struct neigh_node *find_router(struct bat_priv *bat_priv, + struct orig_node *orig_node, struct batman_if *recv_if); +void update_bonding_candidates(struct bat_priv *bat_priv, + struct orig_node *orig_node); + +#endif /* _NET_BATMAN_ADV_ROUTING_H_ */ diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c new file mode 100644 index 0000000..b89b9f7 --- /dev/null +++ b/net/batman-adv/send.c @@ -0,0 +1,585 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "send.h" +#include "routing.h" +#include "translation-table.h" +#include "soft-interface.h" +#include "hard-interface.h" +#include "types.h" +#include "vis.h" +#include "aggregation.h" +#include "gateway_common.h" +#include "originator.h" + +static void send_outstanding_bcast_packet(struct work_struct *work); + +/* apply hop penalty for a normal link */ +static uint8_t hop_penalty(const uint8_t tq, struct bat_priv *bat_priv) +{ + int hop_penalty = atomic_read(&bat_priv->hop_penalty); + return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE); +} + +/* when do we schedule our own packet to be sent */ +static unsigned long own_send_time(struct bat_priv *bat_priv) +{ + return jiffies + msecs_to_jiffies( + atomic_read(&bat_priv->orig_interval) - + JITTER + (random32() % 2*JITTER)); +} + +/* when do we schedule a forwarded packet to be sent */ +static unsigned long forward_send_time(struct bat_priv *bat_priv) +{ + return jiffies + msecs_to_jiffies(random32() % (JITTER/2)); +} + +/* send out an already prepared packet to the given address via the + * specified batman interface */ +int send_skb_packet(struct sk_buff *skb, + struct batman_if *batman_if, + uint8_t *dst_addr) +{ + struct ethhdr *ethhdr; + + if (batman_if->if_status != IF_ACTIVE) + goto send_skb_err; + + if (unlikely(!batman_if->net_dev)) + goto send_skb_err; + + if (!(batman_if->net_dev->flags & IFF_UP)) { + pr_warning("Interface %s is not up - can't send packet via " + "that interface!\n", batman_if->net_dev->name); + goto send_skb_err; + } + + /* push to the ethernet header. */ + if (my_skb_head_push(skb, sizeof(struct ethhdr)) < 0) + goto send_skb_err; + + skb_reset_mac_header(skb); + + ethhdr = (struct ethhdr *) skb_mac_header(skb); + memcpy(ethhdr->h_source, batman_if->net_dev->dev_addr, ETH_ALEN); + memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN); + ethhdr->h_proto = __constant_htons(ETH_P_BATMAN); + + skb_set_network_header(skb, ETH_HLEN); + skb->priority = TC_PRIO_CONTROL; + skb->protocol = __constant_htons(ETH_P_BATMAN); + + skb->dev = batman_if->net_dev; + + /* dev_queue_xmit() returns a negative result on error. However on + * congestion and traffic shaping, it drops and returns NET_XMIT_DROP + * (which is > 0). This will not be treated as an error. */ + + return dev_queue_xmit(skb); +send_skb_err: + kfree_skb(skb); + return NET_XMIT_DROP; +} + +/* Send a packet to a given interface */ +static void send_packet_to_if(struct forw_packet *forw_packet, + struct batman_if *batman_if) +{ + struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); + char *fwd_str; + uint8_t packet_num; + int16_t buff_pos; + struct batman_packet *batman_packet; + struct sk_buff *skb; + + if (batman_if->if_status != IF_ACTIVE) + return; + + packet_num = 0; + buff_pos = 0; + batman_packet = (struct batman_packet *)forw_packet->skb->data; + + /* adjust all flags and log packets */ + while (aggregated_packet(buff_pos, + forw_packet->packet_len, + batman_packet->num_hna)) { + + /* we might have aggregated direct link packets with an + * ordinary base packet */ + if ((forw_packet->direct_link_flags & (1 << packet_num)) && + (forw_packet->if_incoming == batman_if)) + batman_packet->flags |= DIRECTLINK; + else + batman_packet->flags &= ~DIRECTLINK; + + fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ? + "Sending own" : + "Forwarding")); + bat_dbg(DBG_BATMAN, bat_priv, + "%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d," + " IDF %s) on interface %s [%pM]\n", + fwd_str, (packet_num > 0 ? "aggregated " : ""), + batman_packet->orig, ntohl(batman_packet->seqno), + batman_packet->tq, batman_packet->ttl, + (batman_packet->flags & DIRECTLINK ? + "on" : "off"), + batman_if->net_dev->name, batman_if->net_dev->dev_addr); + + buff_pos += sizeof(struct batman_packet) + + (batman_packet->num_hna * ETH_ALEN); + packet_num++; + batman_packet = (struct batman_packet *) + (forw_packet->skb->data + buff_pos); + } + + /* create clone because function is called more than once */ + skb = skb_clone(forw_packet->skb, GFP_ATOMIC); + if (skb) + send_skb_packet(skb, batman_if, broadcast_addr); +} + +/* send a batman packet */ +static void send_packet(struct forw_packet *forw_packet) +{ + struct batman_if *batman_if; + struct net_device *soft_iface; + struct bat_priv *bat_priv; + struct batman_packet *batman_packet = + (struct batman_packet *)(forw_packet->skb->data); + unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0); + + if (!forw_packet->if_incoming) { + pr_err("Error - can't forward packet: incoming iface not " + "specified\n"); + return; + } + + soft_iface = forw_packet->if_incoming->soft_iface; + bat_priv = netdev_priv(soft_iface); + + if (forw_packet->if_incoming->if_status != IF_ACTIVE) + return; + + /* multihomed peer assumed */ + /* non-primary OGMs are only broadcasted on their interface */ + if ((directlink && (batman_packet->ttl == 1)) || + (forw_packet->own && (forw_packet->if_incoming->if_num > 0))) { + + /* FIXME: what about aggregated packets ? */ + bat_dbg(DBG_BATMAN, bat_priv, + "%s packet (originator %pM, seqno %d, TTL %d) " + "on interface %s [%pM]\n", + (forw_packet->own ? "Sending own" : "Forwarding"), + batman_packet->orig, ntohl(batman_packet->seqno), + batman_packet->ttl, + forw_packet->if_incoming->net_dev->name, + forw_packet->if_incoming->net_dev->dev_addr); + + /* skb is only used once and than forw_packet is free'd */ + send_skb_packet(forw_packet->skb, forw_packet->if_incoming, + broadcast_addr); + forw_packet->skb = NULL; + + return; + } + + /* broadcast on every interface */ + rcu_read_lock(); + list_for_each_entry_rcu(batman_if, &if_list, list) { + if (batman_if->soft_iface != soft_iface) + continue; + + send_packet_to_if(forw_packet, batman_if); + } + rcu_read_unlock(); +} + +static void rebuild_batman_packet(struct bat_priv *bat_priv, + struct batman_if *batman_if) +{ + int new_len; + unsigned char *new_buff; + struct batman_packet *batman_packet; + + new_len = sizeof(struct batman_packet) + + (bat_priv->num_local_hna * ETH_ALEN); + new_buff = kmalloc(new_len, GFP_ATOMIC); + + /* keep old buffer if kmalloc should fail */ + if (new_buff) { + memcpy(new_buff, batman_if->packet_buff, + sizeof(struct batman_packet)); + batman_packet = (struct batman_packet *)new_buff; + + batman_packet->num_hna = hna_local_fill_buffer(bat_priv, + new_buff + sizeof(struct batman_packet), + new_len - sizeof(struct batman_packet)); + + kfree(batman_if->packet_buff); + batman_if->packet_buff = new_buff; + batman_if->packet_len = new_len; + } +} + +void schedule_own_packet(struct batman_if *batman_if) +{ + struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); + unsigned long send_time; + struct batman_packet *batman_packet; + int vis_server; + + if ((batman_if->if_status == IF_NOT_IN_USE) || + (batman_if->if_status == IF_TO_BE_REMOVED)) + return; + + vis_server = atomic_read(&bat_priv->vis_mode); + + /** + * the interface gets activated here to avoid race conditions between + * the moment of activating the interface in + * hardif_activate_interface() where the originator mac is set and + * outdated packets (especially uninitialized mac addresses) in the + * packet queue + */ + if (batman_if->if_status == IF_TO_BE_ACTIVATED) + batman_if->if_status = IF_ACTIVE; + + /* if local hna has changed and interface is a primary interface */ + if ((atomic_read(&bat_priv->hna_local_changed)) && + (batman_if == bat_priv->primary_if)) + rebuild_batman_packet(bat_priv, batman_if); + + /** + * NOTE: packet_buff might just have been re-allocated in + * rebuild_batman_packet() + */ + batman_packet = (struct batman_packet *)batman_if->packet_buff; + + /* change sequence number to network order */ + batman_packet->seqno = + htonl((uint32_t)atomic_read(&batman_if->seqno)); + + if (vis_server == VIS_TYPE_SERVER_SYNC) + batman_packet->flags |= VIS_SERVER; + else + batman_packet->flags &= ~VIS_SERVER; + + if ((batman_if == bat_priv->primary_if) && + (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER)) + batman_packet->gw_flags = + (uint8_t)atomic_read(&bat_priv->gw_bandwidth); + else + batman_packet->gw_flags = 0; + + atomic_inc(&batman_if->seqno); + + slide_own_bcast_window(batman_if); + send_time = own_send_time(bat_priv); + add_bat_packet_to_list(bat_priv, + batman_if->packet_buff, + batman_if->packet_len, + batman_if, 1, send_time); +} + +void schedule_forward_packet(struct orig_node *orig_node, + struct ethhdr *ethhdr, + struct batman_packet *batman_packet, + uint8_t directlink, int hna_buff_len, + struct batman_if *if_incoming) +{ + struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + unsigned char in_tq, in_ttl, tq_avg = 0; + unsigned long send_time; + + if (batman_packet->ttl <= 1) { + bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n"); + return; + } + + in_tq = batman_packet->tq; + in_ttl = batman_packet->ttl; + + batman_packet->ttl--; + memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN); + + /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast + * of our best tq value */ + if ((orig_node->router) && (orig_node->router->tq_avg != 0)) { + + /* rebroadcast ogm of best ranking neighbor as is */ + if (!compare_orig(orig_node->router->addr, ethhdr->h_source)) { + batman_packet->tq = orig_node->router->tq_avg; + + if (orig_node->router->last_ttl) + batman_packet->ttl = orig_node->router->last_ttl + - 1; + } + + tq_avg = orig_node->router->tq_avg; + } + + /* apply hop penalty */ + batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv); + + bat_dbg(DBG_BATMAN, bat_priv, + "Forwarding packet: tq_orig: %i, tq_avg: %i, " + "tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n", + in_tq, tq_avg, batman_packet->tq, in_ttl - 1, + batman_packet->ttl); + + batman_packet->seqno = htonl(batman_packet->seqno); + + /* switch of primaries first hop flag when forwarding */ + batman_packet->flags &= ~PRIMARIES_FIRST_HOP; + if (directlink) + batman_packet->flags |= DIRECTLINK; + else + batman_packet->flags &= ~DIRECTLINK; + + send_time = forward_send_time(bat_priv); + add_bat_packet_to_list(bat_priv, + (unsigned char *)batman_packet, + sizeof(struct batman_packet) + hna_buff_len, + if_incoming, 0, send_time); +} + +static void forw_packet_free(struct forw_packet *forw_packet) +{ + if (forw_packet->skb) + kfree_skb(forw_packet->skb); + kfree(forw_packet); +} + +static void _add_bcast_packet_to_list(struct bat_priv *bat_priv, + struct forw_packet *forw_packet, + unsigned long send_time) +{ + INIT_HLIST_NODE(&forw_packet->list); + + /* add new packet to packet list */ + spin_lock_bh(&bat_priv->forw_bcast_list_lock); + hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); + spin_unlock_bh(&bat_priv->forw_bcast_list_lock); + + /* start timer for this packet */ + INIT_DELAYED_WORK(&forw_packet->delayed_work, + send_outstanding_bcast_packet); + queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work, + send_time); +} + +#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0) +/* add a broadcast packet to the queue and setup timers. broadcast packets + * are sent multiple times to increase probability for beeing received. + * + * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on + * errors. + * + * The skb is not consumed, so the caller should make sure that the + * skb is freed. */ +int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb) +{ + struct forw_packet *forw_packet; + struct bcast_packet *bcast_packet; + + if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { + bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n"); + goto out; + } + + if (!bat_priv->primary_if) + goto out; + + forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC); + + if (!forw_packet) + goto out_and_inc; + + skb = skb_copy(skb, GFP_ATOMIC); + if (!skb) + goto packet_free; + + /* as we have a copy now, it is safe to decrease the TTL */ + bcast_packet = (struct bcast_packet *)skb->data; + bcast_packet->ttl--; + + skb_reset_mac_header(skb); + + forw_packet->skb = skb; + forw_packet->if_incoming = bat_priv->primary_if; + + /* how often did we send the bcast packet ? */ + forw_packet->num_packets = 0; + + _add_bcast_packet_to_list(bat_priv, forw_packet, 1); + return NETDEV_TX_OK; + +packet_free: + kfree(forw_packet); +out_and_inc: + atomic_inc(&bat_priv->bcast_queue_left); +out: + return NETDEV_TX_BUSY; +} + +static void send_outstanding_bcast_packet(struct work_struct *work) +{ + struct batman_if *batman_if; + struct delayed_work *delayed_work = + container_of(work, struct delayed_work, work); + struct forw_packet *forw_packet = + container_of(delayed_work, struct forw_packet, delayed_work); + struct sk_buff *skb1; + struct net_device *soft_iface = forw_packet->if_incoming->soft_iface; + struct bat_priv *bat_priv = netdev_priv(soft_iface); + + spin_lock_bh(&bat_priv->forw_bcast_list_lock); + hlist_del(&forw_packet->list); + spin_unlock_bh(&bat_priv->forw_bcast_list_lock); + + if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING) + goto out; + + /* rebroadcast packet */ + rcu_read_lock(); + list_for_each_entry_rcu(batman_if, &if_list, list) { + if (batman_if->soft_iface != soft_iface) + continue; + + /* send a copy of the saved skb */ + skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); + if (skb1) + send_skb_packet(skb1, batman_if, broadcast_addr); + } + rcu_read_unlock(); + + forw_packet->num_packets++; + + /* if we still have some more bcasts to send */ + if (forw_packet->num_packets < 3) { + _add_bcast_packet_to_list(bat_priv, forw_packet, + ((5 * HZ) / 1000)); + return; + } + +out: + forw_packet_free(forw_packet); + atomic_inc(&bat_priv->bcast_queue_left); +} + +void send_outstanding_bat_packet(struct work_struct *work) +{ + struct delayed_work *delayed_work = + container_of(work, struct delayed_work, work); + struct forw_packet *forw_packet = + container_of(delayed_work, struct forw_packet, delayed_work); + struct bat_priv *bat_priv; + + bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); + spin_lock_bh(&bat_priv->forw_bat_list_lock); + hlist_del(&forw_packet->list); + spin_unlock_bh(&bat_priv->forw_bat_list_lock); + + if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING) + goto out; + + send_packet(forw_packet); + + /** + * we have to have at least one packet in the queue + * to determine the queues wake up time unless we are + * shutting down + */ + if (forw_packet->own) + schedule_own_packet(forw_packet->if_incoming); + +out: + /* don't count own packet */ + if (!forw_packet->own) + atomic_inc(&bat_priv->batman_queue_left); + + forw_packet_free(forw_packet); +} + +void purge_outstanding_packets(struct bat_priv *bat_priv, + struct batman_if *batman_if) +{ + struct forw_packet *forw_packet; + struct hlist_node *tmp_node, *safe_tmp_node; + + if (batman_if) + bat_dbg(DBG_BATMAN, bat_priv, + "purge_outstanding_packets(): %s\n", + batman_if->net_dev->name); + else + bat_dbg(DBG_BATMAN, bat_priv, + "purge_outstanding_packets()\n"); + + /* free bcast list */ + spin_lock_bh(&bat_priv->forw_bcast_list_lock); + hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, + &bat_priv->forw_bcast_list, list) { + + /** + * if purge_outstanding_packets() was called with an argmument + * we delete only packets belonging to the given interface + */ + if ((batman_if) && + (forw_packet->if_incoming != batman_if)) + continue; + + spin_unlock_bh(&bat_priv->forw_bcast_list_lock); + + /** + * send_outstanding_bcast_packet() will lock the list to + * delete the item from the list + */ + cancel_delayed_work_sync(&forw_packet->delayed_work); + spin_lock_bh(&bat_priv->forw_bcast_list_lock); + } + spin_unlock_bh(&bat_priv->forw_bcast_list_lock); + + /* free batman packet list */ + spin_lock_bh(&bat_priv->forw_bat_list_lock); + hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, + &bat_priv->forw_bat_list, list) { + + /** + * if purge_outstanding_packets() was called with an argmument + * we delete only packets belonging to the given interface + */ + if ((batman_if) && + (forw_packet->if_incoming != batman_if)) + continue; + + spin_unlock_bh(&bat_priv->forw_bat_list_lock); + + /** + * send_outstanding_bat_packet() will lock the list to + * delete the item from the list + */ + cancel_delayed_work_sync(&forw_packet->delayed_work); + spin_lock_bh(&bat_priv->forw_bat_list_lock); + } + spin_unlock_bh(&bat_priv->forw_bat_list_lock); +} diff --git a/net/batman-adv/send.h b/net/batman-adv/send.h new file mode 100644 index 0000000..c4cefa8 --- /dev/null +++ b/net/batman-adv/send.h @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_SEND_H_ +#define _NET_BATMAN_ADV_SEND_H_ + +#include "types.h" + +int send_skb_packet(struct sk_buff *skb, + struct batman_if *batman_if, + uint8_t *dst_addr); +void schedule_own_packet(struct batman_if *batman_if); +void schedule_forward_packet(struct orig_node *orig_node, + struct ethhdr *ethhdr, + struct batman_packet *batman_packet, + uint8_t directlink, int hna_buff_len, + struct batman_if *if_outgoing); +int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb); +void send_outstanding_bat_packet(struct work_struct *work); +void purge_outstanding_packets(struct bat_priv *bat_priv, + struct batman_if *batman_if); + +#endif /* _NET_BATMAN_ADV_SEND_H_ */ diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c new file mode 100644 index 0000000..e89ede1 --- /dev/null +++ b/net/batman-adv/soft-interface.c @@ -0,0 +1,697 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "soft-interface.h" +#include "hard-interface.h" +#include "routing.h" +#include "send.h" +#include "bat_debugfs.h" +#include "translation-table.h" +#include "types.h" +#include "hash.h" +#include "gateway_common.h" +#include "gateway_client.h" +#include "send.h" +#include "bat_sysfs.h" +#include <linux/slab.h> +#include <linux/ethtool.h> +#include <linux/etherdevice.h> +#include <linux/if_vlan.h> +#include "unicast.h" +#include "routing.h" + + +static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd); +static void bat_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *info); +static u32 bat_get_msglevel(struct net_device *dev); +static void bat_set_msglevel(struct net_device *dev, u32 value); +static u32 bat_get_link(struct net_device *dev); +static u32 bat_get_rx_csum(struct net_device *dev); +static int bat_set_rx_csum(struct net_device *dev, u32 data); + +static const struct ethtool_ops bat_ethtool_ops = { + .get_settings = bat_get_settings, + .get_drvinfo = bat_get_drvinfo, + .get_msglevel = bat_get_msglevel, + .set_msglevel = bat_set_msglevel, + .get_link = bat_get_link, + .get_rx_csum = bat_get_rx_csum, + .set_rx_csum = bat_set_rx_csum +}; + +int my_skb_head_push(struct sk_buff *skb, unsigned int len) +{ + int result; + + /** + * TODO: We must check if we can release all references to non-payload + * data using skb_header_release in our skbs to allow skb_cow_header to + * work optimally. This means that those skbs are not allowed to read + * or write any data which is before the current position of skb->data + * after that call and thus allow other skbs with the same data buffer + * to write freely in that area. + */ + result = skb_cow_head(skb, len); + if (result < 0) + return result; + + skb_push(skb, len); + return 0; +} + +static void softif_neigh_free_ref(struct kref *refcount) +{ + struct softif_neigh *softif_neigh; + + softif_neigh = container_of(refcount, struct softif_neigh, refcount); + kfree(softif_neigh); +} + +static void softif_neigh_free_rcu(struct rcu_head *rcu) +{ + struct softif_neigh *softif_neigh; + + softif_neigh = container_of(rcu, struct softif_neigh, rcu); + kref_put(&softif_neigh->refcount, softif_neigh_free_ref); +} + +void softif_neigh_purge(struct bat_priv *bat_priv) +{ + struct softif_neigh *softif_neigh, *softif_neigh_tmp; + struct hlist_node *node, *node_tmp; + + spin_lock_bh(&bat_priv->softif_neigh_lock); + + hlist_for_each_entry_safe(softif_neigh, node, node_tmp, + &bat_priv->softif_neigh_list, list) { + + if ((!time_after(jiffies, softif_neigh->last_seen + + msecs_to_jiffies(SOFTIF_NEIGH_TIMEOUT))) && + (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE)) + continue; + + hlist_del_rcu(&softif_neigh->list); + + if (bat_priv->softif_neigh == softif_neigh) { + bat_dbg(DBG_ROUTES, bat_priv, + "Current mesh exit point '%pM' vanished " + "(vid: %d).\n", + softif_neigh->addr, softif_neigh->vid); + softif_neigh_tmp = bat_priv->softif_neigh; + bat_priv->softif_neigh = NULL; + kref_put(&softif_neigh_tmp->refcount, + softif_neigh_free_ref); + } + + call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu); + } + + spin_unlock_bh(&bat_priv->softif_neigh_lock); +} + +static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv, + uint8_t *addr, short vid) +{ + struct softif_neigh *softif_neigh; + struct hlist_node *node; + + rcu_read_lock(); + hlist_for_each_entry_rcu(softif_neigh, node, + &bat_priv->softif_neigh_list, list) { + if (memcmp(softif_neigh->addr, addr, ETH_ALEN) != 0) + continue; + + if (softif_neigh->vid != vid) + continue; + + softif_neigh->last_seen = jiffies; + goto found; + } + + softif_neigh = kzalloc(sizeof(struct softif_neigh), GFP_ATOMIC); + if (!softif_neigh) + goto out; + + memcpy(softif_neigh->addr, addr, ETH_ALEN); + softif_neigh->vid = vid; + softif_neigh->last_seen = jiffies; + kref_init(&softif_neigh->refcount); + + INIT_HLIST_NODE(&softif_neigh->list); + spin_lock_bh(&bat_priv->softif_neigh_lock); + hlist_add_head_rcu(&softif_neigh->list, &bat_priv->softif_neigh_list); + spin_unlock_bh(&bat_priv->softif_neigh_lock); + +found: + kref_get(&softif_neigh->refcount); +out: + rcu_read_unlock(); + return softif_neigh; +} + +int softif_neigh_seq_print_text(struct seq_file *seq, void *offset) +{ + struct net_device *net_dev = (struct net_device *)seq->private; + struct bat_priv *bat_priv = netdev_priv(net_dev); + struct softif_neigh *softif_neigh; + struct hlist_node *node; + size_t buf_size, pos; + char *buff; + + if (!bat_priv->primary_if) { + return seq_printf(seq, "BATMAN mesh %s disabled - " + "please specify interfaces to enable it\n", + net_dev->name); + } + + seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name); + + buf_size = 1; + /* Estimate length for: " xx:xx:xx:xx:xx:xx\n" */ + rcu_read_lock(); + hlist_for_each_entry_rcu(softif_neigh, node, + &bat_priv->softif_neigh_list, list) + buf_size += 30; + rcu_read_unlock(); + + buff = kmalloc(buf_size, GFP_ATOMIC); + if (!buff) + return -ENOMEM; + + buff[0] = '\0'; + pos = 0; + + rcu_read_lock(); + hlist_for_each_entry_rcu(softif_neigh, node, + &bat_priv->softif_neigh_list, list) { + pos += snprintf(buff + pos, 31, "%s %pM (vid: %d)\n", + bat_priv->softif_neigh == softif_neigh + ? "=>" : " ", softif_neigh->addr, + softif_neigh->vid); + } + rcu_read_unlock(); + + seq_printf(seq, "%s", buff); + kfree(buff); + return 0; +} + +static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev, + short vid) +{ + struct bat_priv *bat_priv = netdev_priv(dev); + struct ethhdr *ethhdr = (struct ethhdr *)skb->data; + struct batman_packet *batman_packet; + struct softif_neigh *softif_neigh, *softif_neigh_tmp; + + if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) + batman_packet = (struct batman_packet *) + (skb->data + ETH_HLEN + VLAN_HLEN); + else + batman_packet = (struct batman_packet *)(skb->data + ETH_HLEN); + + if (batman_packet->version != COMPAT_VERSION) + goto err; + + if (batman_packet->packet_type != BAT_PACKET) + goto err; + + if (!(batman_packet->flags & PRIMARIES_FIRST_HOP)) + goto err; + + if (is_my_mac(batman_packet->orig)) + goto err; + + softif_neigh = softif_neigh_get(bat_priv, batman_packet->orig, vid); + + if (!softif_neigh) + goto err; + + if (bat_priv->softif_neigh == softif_neigh) + goto out; + + /* we got a neighbor but its mac is 'bigger' than ours */ + if (memcmp(bat_priv->primary_if->net_dev->dev_addr, + softif_neigh->addr, ETH_ALEN) < 0) + goto out; + + /* switch to new 'smallest neighbor' */ + if ((bat_priv->softif_neigh) && + (memcmp(softif_neigh->addr, bat_priv->softif_neigh->addr, + ETH_ALEN) < 0)) { + bat_dbg(DBG_ROUTES, bat_priv, + "Changing mesh exit point from %pM (vid: %d) " + "to %pM (vid: %d).\n", + bat_priv->softif_neigh->addr, + bat_priv->softif_neigh->vid, + softif_neigh->addr, softif_neigh->vid); + softif_neigh_tmp = bat_priv->softif_neigh; + bat_priv->softif_neigh = softif_neigh; + kref_put(&softif_neigh_tmp->refcount, softif_neigh_free_ref); + /* we need to hold the additional reference */ + goto err; + } + + /* close own batX device and use softif_neigh as exit node */ + if ((!bat_priv->softif_neigh) && + (memcmp(softif_neigh->addr, + bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN) < 0)) { + bat_dbg(DBG_ROUTES, bat_priv, + "Setting mesh exit point to %pM (vid: %d).\n", + softif_neigh->addr, softif_neigh->vid); + bat_priv->softif_neigh = softif_neigh; + /* we need to hold the additional reference */ + goto err; + } + +out: + kref_put(&softif_neigh->refcount, softif_neigh_free_ref); +err: + kfree_skb(skb); + return; +} + +static int interface_open(struct net_device *dev) +{ + netif_start_queue(dev); + return 0; +} + +static int interface_release(struct net_device *dev) +{ + netif_stop_queue(dev); + return 0; +} + +static struct net_device_stats *interface_stats(struct net_device *dev) +{ + struct bat_priv *bat_priv = netdev_priv(dev); + return &bat_priv->stats; +} + +static int interface_set_mac_addr(struct net_device *dev, void *p) +{ + struct bat_priv *bat_priv = netdev_priv(dev); + struct sockaddr *addr = p; + + if (!is_valid_ether_addr(addr->sa_data)) + return -EADDRNOTAVAIL; + + /* only modify hna-table if it has been initialised before */ + if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) { + hna_local_remove(bat_priv, dev->dev_addr, + "mac address changed"); + hna_local_add(dev, addr->sa_data); + } + + memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); + return 0; +} + +static int interface_change_mtu(struct net_device *dev, int new_mtu) +{ + /* check ranges */ + if ((new_mtu < 68) || (new_mtu > hardif_min_mtu(dev))) + return -EINVAL; + + dev->mtu = new_mtu; + + return 0; +} + +int interface_tx(struct sk_buff *skb, struct net_device *soft_iface) +{ + struct ethhdr *ethhdr = (struct ethhdr *)skb->data; + struct bat_priv *bat_priv = netdev_priv(soft_iface); + struct bcast_packet *bcast_packet; + struct vlan_ethhdr *vhdr; + int data_len = skb->len, ret; + short vid = -1; + bool do_bcast = false; + + if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE) + goto dropped; + + soft_iface->trans_start = jiffies; + + switch (ntohs(ethhdr->h_proto)) { + case ETH_P_8021Q: + vhdr = (struct vlan_ethhdr *)skb->data; + vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; + + if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN) + break; + + /* fall through */ + case ETH_P_BATMAN: + softif_batman_recv(skb, soft_iface, vid); + goto end; + } + + /** + * if we have a another chosen mesh exit node in range + * it will transport the packets to the mesh + */ + if ((bat_priv->softif_neigh) && (bat_priv->softif_neigh->vid == vid)) + goto dropped; + + /* TODO: check this for locks */ + hna_local_add(soft_iface, ethhdr->h_source); + + if (is_multicast_ether_addr(ethhdr->h_dest)) { + ret = gw_is_target(bat_priv, skb); + + if (ret < 0) + goto dropped; + + if (ret == 0) + do_bcast = true; + } + + /* ethernet packet should be broadcasted */ + if (do_bcast) { + if (!bat_priv->primary_if) + goto dropped; + + if (my_skb_head_push(skb, sizeof(struct bcast_packet)) < 0) + goto dropped; + + bcast_packet = (struct bcast_packet *)skb->data; + bcast_packet->version = COMPAT_VERSION; + bcast_packet->ttl = TTL; + + /* batman packet type: broadcast */ + bcast_packet->packet_type = BAT_BCAST; + + /* hw address of first interface is the orig mac because only + * this mac is known throughout the mesh */ + memcpy(bcast_packet->orig, + bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); + + /* set broadcast sequence number */ + bcast_packet->seqno = + htonl(atomic_inc_return(&bat_priv->bcast_seqno)); + + add_bcast_packet_to_list(bat_priv, skb); + + /* a copy is stored in the bcast list, therefore removing + * the original skb. */ + kfree_skb(skb); + + /* unicast packet */ + } else { + ret = unicast_send_skb(skb, bat_priv); + if (ret != 0) + goto dropped_freed; + } + + bat_priv->stats.tx_packets++; + bat_priv->stats.tx_bytes += data_len; + goto end; + +dropped: + kfree_skb(skb); +dropped_freed: + bat_priv->stats.tx_dropped++; +end: + return NETDEV_TX_OK; +} + +void interface_rx(struct net_device *soft_iface, + struct sk_buff *skb, struct batman_if *recv_if, + int hdr_size) +{ + struct bat_priv *bat_priv = netdev_priv(soft_iface); + struct unicast_packet *unicast_packet; + struct ethhdr *ethhdr; + struct vlan_ethhdr *vhdr; + short vid = -1; + int ret; + + /* check if enough space is available for pulling, and pull */ + if (!pskb_may_pull(skb, hdr_size)) + goto dropped; + + skb_pull_rcsum(skb, hdr_size); + skb_reset_mac_header(skb); + + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + switch (ntohs(ethhdr->h_proto)) { + case ETH_P_8021Q: + vhdr = (struct vlan_ethhdr *)skb->data; + vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; + + if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN) + break; + + /* fall through */ + case ETH_P_BATMAN: + goto dropped; + } + + /** + * if we have a another chosen mesh exit node in range + * it will transport the packets to the non-mesh network + */ + if ((bat_priv->softif_neigh) && (bat_priv->softif_neigh->vid == vid)) { + skb_push(skb, hdr_size); + unicast_packet = (struct unicast_packet *)skb->data; + + if ((unicast_packet->packet_type != BAT_UNICAST) && + (unicast_packet->packet_type != BAT_UNICAST_FRAG)) + goto dropped; + + skb_reset_mac_header(skb); + + memcpy(unicast_packet->dest, + bat_priv->softif_neigh->addr, ETH_ALEN); + ret = route_unicast_packet(skb, recv_if, hdr_size); + if (ret == NET_RX_DROP) + goto dropped; + + goto out; + } + + /* skb->dev & skb->pkt_type are set here */ + if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) + goto dropped; + skb->protocol = eth_type_trans(skb, soft_iface); + + /* should not be neccesary anymore as we use skb_pull_rcsum() + * TODO: please verify this and remove this TODO + * -- Dec 21st 2009, Simon Wunderlich */ + +/* skb->ip_summed = CHECKSUM_UNNECESSARY;*/ + + bat_priv->stats.rx_packets++; + bat_priv->stats.rx_bytes += skb->len + sizeof(struct ethhdr); + + soft_iface->last_rx = jiffies; + + netif_rx(skb); + return; + +dropped: + kfree_skb(skb); +out: + return; +} + +#ifdef HAVE_NET_DEVICE_OPS +static const struct net_device_ops bat_netdev_ops = { + .ndo_open = interface_open, + .ndo_stop = interface_release, + .ndo_get_stats = interface_stats, + .ndo_set_mac_address = interface_set_mac_addr, + .ndo_change_mtu = interface_change_mtu, + .ndo_start_xmit = interface_tx, + .ndo_validate_addr = eth_validate_addr +}; +#endif + +static void interface_setup(struct net_device *dev) +{ + struct bat_priv *priv = netdev_priv(dev); + char dev_addr[ETH_ALEN]; + + ether_setup(dev); + +#ifdef HAVE_NET_DEVICE_OPS + dev->netdev_ops = &bat_netdev_ops; +#else + dev->open = interface_open; + dev->stop = interface_release; + dev->get_stats = interface_stats; + dev->set_mac_address = interface_set_mac_addr; + dev->change_mtu = interface_change_mtu; + dev->hard_start_xmit = interface_tx; +#endif + dev->destructor = free_netdev; + + /** + * can't call min_mtu, because the needed variables + * have not been initialized yet + */ + dev->mtu = ETH_DATA_LEN; + dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the + * skbuff for our header */ + + /* generate random address */ + random_ether_addr(dev_addr); + memcpy(dev->dev_addr, dev_addr, ETH_ALEN); + + SET_ETHTOOL_OPS(dev, &bat_ethtool_ops); + + memset(priv, 0, sizeof(struct bat_priv)); +} + +struct net_device *softif_create(char *name) +{ + struct net_device *soft_iface; + struct bat_priv *bat_priv; + int ret; + + soft_iface = alloc_netdev(sizeof(struct bat_priv) , name, + interface_setup); + + if (!soft_iface) { + pr_err("Unable to allocate the batman interface: %s\n", name); + goto out; + } + + ret = register_netdev(soft_iface); + if (ret < 0) { + pr_err("Unable to register the batman interface '%s': %i\n", + name, ret); + goto free_soft_iface; + } + + bat_priv = netdev_priv(soft_iface); + + atomic_set(&bat_priv->aggregated_ogms, 1); + atomic_set(&bat_priv->bonding, 0); + atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE); + atomic_set(&bat_priv->gw_mode, GW_MODE_OFF); + atomic_set(&bat_priv->gw_sel_class, 20); + atomic_set(&bat_priv->gw_bandwidth, 41); + atomic_set(&bat_priv->orig_interval, 1000); + atomic_set(&bat_priv->hop_penalty, 10); + atomic_set(&bat_priv->log_level, 0); + atomic_set(&bat_priv->fragmentation, 1); + atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN); + atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN); + + atomic_set(&bat_priv->mesh_state, MESH_INACTIVE); + atomic_set(&bat_priv->bcast_seqno, 1); + atomic_set(&bat_priv->hna_local_changed, 0); + + bat_priv->primary_if = NULL; + bat_priv->num_ifaces = 0; + bat_priv->softif_neigh = NULL; + + ret = sysfs_add_meshif(soft_iface); + if (ret < 0) + goto unreg_soft_iface; + + ret = debugfs_add_meshif(soft_iface); + if (ret < 0) + goto unreg_sysfs; + + ret = mesh_init(soft_iface); + if (ret < 0) + goto unreg_debugfs; + + return soft_iface; + +unreg_debugfs: + debugfs_del_meshif(soft_iface); +unreg_sysfs: + sysfs_del_meshif(soft_iface); +unreg_soft_iface: + unregister_netdev(soft_iface); + return NULL; + +free_soft_iface: + free_netdev(soft_iface); +out: + return NULL; +} + +void softif_destroy(struct net_device *soft_iface) +{ + debugfs_del_meshif(soft_iface); + sysfs_del_meshif(soft_iface); + mesh_free(soft_iface); + unregister_netdevice(soft_iface); +} + +/* ethtool */ +static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) +{ + cmd->supported = 0; + cmd->advertising = 0; + cmd->speed = SPEED_10; + cmd->duplex = DUPLEX_FULL; + cmd->port = PORT_TP; + cmd->phy_address = 0; + cmd->transceiver = XCVR_INTERNAL; + cmd->autoneg = AUTONEG_DISABLE; + cmd->maxtxpkt = 0; + cmd->maxrxpkt = 0; + + return 0; +} + +static void bat_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *info) +{ + strcpy(info->driver, "B.A.T.M.A.N. advanced"); + strcpy(info->version, SOURCE_VERSION); + strcpy(info->fw_version, "N/A"); + strcpy(info->bus_info, "batman"); +} + +static u32 bat_get_msglevel(struct net_device *dev) +{ + return -EOPNOTSUPP; +} + +static void bat_set_msglevel(struct net_device *dev, u32 value) +{ +} + +static u32 bat_get_link(struct net_device *dev) +{ + return 1; +} + +static u32 bat_get_rx_csum(struct net_device *dev) +{ + return 0; +} + +static int bat_set_rx_csum(struct net_device *dev, u32 data) +{ + return -EOPNOTSUPP; +} diff --git a/net/batman-adv/soft-interface.h b/net/batman-adv/soft-interface.h new file mode 100644 index 0000000..02b7733 --- /dev/null +++ b/net/batman-adv/soft-interface.h @@ -0,0 +1,35 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_SOFT_INTERFACE_H_ +#define _NET_BATMAN_ADV_SOFT_INTERFACE_H_ + +int my_skb_head_push(struct sk_buff *skb, unsigned int len); +int softif_neigh_seq_print_text(struct seq_file *seq, void *offset); +void softif_neigh_purge(struct bat_priv *bat_priv); +int interface_tx(struct sk_buff *skb, struct net_device *soft_iface); +void interface_rx(struct net_device *soft_iface, + struct sk_buff *skb, struct batman_if *recv_if, + int hdr_size); +struct net_device *softif_create(char *name); +void softif_destroy(struct net_device *soft_iface); + +#endif /* _NET_BATMAN_ADV_SOFT_INTERFACE_H_ */ diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c new file mode 100644 index 0000000..a19e16c --- /dev/null +++ b/net/batman-adv/translation-table.c @@ -0,0 +1,534 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "translation-table.h" +#include "soft-interface.h" +#include "types.h" +#include "hash.h" +#include "originator.h" + +static void hna_local_purge(struct work_struct *work); +static void _hna_global_del_orig(struct bat_priv *bat_priv, + struct hna_global_entry *hna_global_entry, + char *message); + +static void hna_local_start_timer(struct bat_priv *bat_priv) +{ + INIT_DELAYED_WORK(&bat_priv->hna_work, hna_local_purge); + queue_delayed_work(bat_event_workqueue, &bat_priv->hna_work, 10 * HZ); +} + +int hna_local_init(struct bat_priv *bat_priv) +{ + if (bat_priv->hna_local_hash) + return 1; + + bat_priv->hna_local_hash = hash_new(1024); + + if (!bat_priv->hna_local_hash) + return 0; + + atomic_set(&bat_priv->hna_local_changed, 0); + hna_local_start_timer(bat_priv); + + return 1; +} + +void hna_local_add(struct net_device *soft_iface, uint8_t *addr) +{ + struct bat_priv *bat_priv = netdev_priv(soft_iface); + struct hna_local_entry *hna_local_entry; + struct hna_global_entry *hna_global_entry; + int required_bytes; + + spin_lock_bh(&bat_priv->hna_lhash_lock); + hna_local_entry = + ((struct hna_local_entry *)hash_find(bat_priv->hna_local_hash, + compare_orig, choose_orig, + addr)); + spin_unlock_bh(&bat_priv->hna_lhash_lock); + + if (hna_local_entry) { + hna_local_entry->last_seen = jiffies; + return; + } + + /* only announce as many hosts as possible in the batman-packet and + space in batman_packet->num_hna That also should give a limit to + MAC-flooding. */ + required_bytes = (bat_priv->num_local_hna + 1) * ETH_ALEN; + required_bytes += BAT_PACKET_LEN; + + if ((required_bytes > ETH_DATA_LEN) || + (atomic_read(&bat_priv->aggregated_ogms) && + required_bytes > MAX_AGGREGATION_BYTES) || + (bat_priv->num_local_hna + 1 > 255)) { + bat_dbg(DBG_ROUTES, bat_priv, + "Can't add new local hna entry (%pM): " + "number of local hna entries exceeds packet size\n", + addr); + return; + } + + bat_dbg(DBG_ROUTES, bat_priv, + "Creating new local hna entry: %pM\n", addr); + + hna_local_entry = kmalloc(sizeof(struct hna_local_entry), GFP_ATOMIC); + if (!hna_local_entry) + return; + + memcpy(hna_local_entry->addr, addr, ETH_ALEN); + hna_local_entry->last_seen = jiffies; + + /* the batman interface mac address should never be purged */ + if (compare_orig(addr, soft_iface->dev_addr)) + hna_local_entry->never_purge = 1; + else + hna_local_entry->never_purge = 0; + + spin_lock_bh(&bat_priv->hna_lhash_lock); + + hash_add(bat_priv->hna_local_hash, compare_orig, choose_orig, + hna_local_entry); + bat_priv->num_local_hna++; + atomic_set(&bat_priv->hna_local_changed, 1); + + spin_unlock_bh(&bat_priv->hna_lhash_lock); + + /* remove address from global hash if present */ + spin_lock_bh(&bat_priv->hna_ghash_lock); + + hna_global_entry = ((struct hna_global_entry *) + hash_find(bat_priv->hna_global_hash, + compare_orig, choose_orig, addr)); + + if (hna_global_entry) + _hna_global_del_orig(bat_priv, hna_global_entry, + "local hna received"); + + spin_unlock_bh(&bat_priv->hna_ghash_lock); +} + +int hna_local_fill_buffer(struct bat_priv *bat_priv, + unsigned char *buff, int buff_len) +{ + struct hashtable_t *hash = bat_priv->hna_local_hash; + struct hna_local_entry *hna_local_entry; + struct element_t *bucket; + int i; + struct hlist_node *walk; + struct hlist_head *head; + int count = 0; + + spin_lock_bh(&bat_priv->hna_lhash_lock); + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + + if (buff_len < (count + 1) * ETH_ALEN) + break; + + hna_local_entry = bucket->data; + memcpy(buff + (count * ETH_ALEN), hna_local_entry->addr, + ETH_ALEN); + + count++; + } + } + + /* if we did not get all new local hnas see you next time ;-) */ + if (count == bat_priv->num_local_hna) + atomic_set(&bat_priv->hna_local_changed, 0); + + spin_unlock_bh(&bat_priv->hna_lhash_lock); + return i; +} + +int hna_local_seq_print_text(struct seq_file *seq, void *offset) +{ + struct net_device *net_dev = (struct net_device *)seq->private; + struct bat_priv *bat_priv = netdev_priv(net_dev); + struct hashtable_t *hash = bat_priv->hna_local_hash; + struct hna_local_entry *hna_local_entry; + int i; + struct hlist_node *walk; + struct hlist_head *head; + struct element_t *bucket; + size_t buf_size, pos; + char *buff; + + if (!bat_priv->primary_if) { + return seq_printf(seq, "BATMAN mesh %s disabled - " + "please specify interfaces to enable it\n", + net_dev->name); + } + + seq_printf(seq, "Locally retrieved addresses (from %s) " + "announced via HNA:\n", + net_dev->name); + + spin_lock_bh(&bat_priv->hna_lhash_lock); + + buf_size = 1; + /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each(walk, head) + buf_size += 21; + } + + buff = kmalloc(buf_size, GFP_ATOMIC); + if (!buff) { + spin_unlock_bh(&bat_priv->hna_lhash_lock); + return -ENOMEM; + } + buff[0] = '\0'; + pos = 0; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + hna_local_entry = bucket->data; + + pos += snprintf(buff + pos, 22, " * %pM\n", + hna_local_entry->addr); + } + } + + spin_unlock_bh(&bat_priv->hna_lhash_lock); + + seq_printf(seq, "%s", buff); + kfree(buff); + return 0; +} + +static void _hna_local_del(void *data, void *arg) +{ + struct bat_priv *bat_priv = (struct bat_priv *)arg; + + kfree(data); + bat_priv->num_local_hna--; + atomic_set(&bat_priv->hna_local_changed, 1); +} + +static void hna_local_del(struct bat_priv *bat_priv, + struct hna_local_entry *hna_local_entry, + char *message) +{ + bat_dbg(DBG_ROUTES, bat_priv, "Deleting local hna entry (%pM): %s\n", + hna_local_entry->addr, message); + + hash_remove(bat_priv->hna_local_hash, compare_orig, choose_orig, + hna_local_entry->addr); + _hna_local_del(hna_local_entry, bat_priv); +} + +void hna_local_remove(struct bat_priv *bat_priv, + uint8_t *addr, char *message) +{ + struct hna_local_entry *hna_local_entry; + + spin_lock_bh(&bat_priv->hna_lhash_lock); + + hna_local_entry = (struct hna_local_entry *) + hash_find(bat_priv->hna_local_hash, compare_orig, choose_orig, + addr); + + if (hna_local_entry) + hna_local_del(bat_priv, hna_local_entry, message); + + spin_unlock_bh(&bat_priv->hna_lhash_lock); +} + +static void hna_local_purge(struct work_struct *work) +{ + struct delayed_work *delayed_work = + container_of(work, struct delayed_work, work); + struct bat_priv *bat_priv = + container_of(delayed_work, struct bat_priv, hna_work); + struct hashtable_t *hash = bat_priv->hna_local_hash; + struct hna_local_entry *hna_local_entry; + int i; + struct hlist_node *walk, *safe; + struct hlist_head *head; + struct element_t *bucket; + unsigned long timeout; + + spin_lock_bh(&bat_priv->hna_lhash_lock); + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) { + hna_local_entry = bucket->data; + + timeout = hna_local_entry->last_seen; + timeout += LOCAL_HNA_TIMEOUT * HZ; + + if ((!hna_local_entry->never_purge) && + time_after(jiffies, timeout)) + hna_local_del(bat_priv, hna_local_entry, + "address timed out"); + } + } + + spin_unlock_bh(&bat_priv->hna_lhash_lock); + hna_local_start_timer(bat_priv); +} + +void hna_local_free(struct bat_priv *bat_priv) +{ + if (!bat_priv->hna_local_hash) + return; + + cancel_delayed_work_sync(&bat_priv->hna_work); + hash_delete(bat_priv->hna_local_hash, _hna_local_del, bat_priv); + bat_priv->hna_local_hash = NULL; +} + +int hna_global_init(struct bat_priv *bat_priv) +{ + if (bat_priv->hna_global_hash) + return 1; + + bat_priv->hna_global_hash = hash_new(1024); + + if (!bat_priv->hna_global_hash) + return 0; + + return 1; +} + +void hna_global_add_orig(struct bat_priv *bat_priv, + struct orig_node *orig_node, + unsigned char *hna_buff, int hna_buff_len) +{ + struct hna_global_entry *hna_global_entry; + struct hna_local_entry *hna_local_entry; + int hna_buff_count = 0; + unsigned char *hna_ptr; + + while ((hna_buff_count + 1) * ETH_ALEN <= hna_buff_len) { + spin_lock_bh(&bat_priv->hna_ghash_lock); + + hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN); + hna_global_entry = (struct hna_global_entry *) + hash_find(bat_priv->hna_global_hash, compare_orig, + choose_orig, hna_ptr); + + if (!hna_global_entry) { + spin_unlock_bh(&bat_priv->hna_ghash_lock); + + hna_global_entry = + kmalloc(sizeof(struct hna_global_entry), + GFP_ATOMIC); + + if (!hna_global_entry) + break; + + memcpy(hna_global_entry->addr, hna_ptr, ETH_ALEN); + + bat_dbg(DBG_ROUTES, bat_priv, + "Creating new global hna entry: " + "%pM (via %pM)\n", + hna_global_entry->addr, orig_node->orig); + + spin_lock_bh(&bat_priv->hna_ghash_lock); + hash_add(bat_priv->hna_global_hash, compare_orig, + choose_orig, hna_global_entry); + + } + + hna_global_entry->orig_node = orig_node; + spin_unlock_bh(&bat_priv->hna_ghash_lock); + + /* remove address from local hash if present */ + spin_lock_bh(&bat_priv->hna_lhash_lock); + + hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN); + hna_local_entry = (struct hna_local_entry *) + hash_find(bat_priv->hna_local_hash, compare_orig, + choose_orig, hna_ptr); + + if (hna_local_entry) + hna_local_del(bat_priv, hna_local_entry, + "global hna received"); + + spin_unlock_bh(&bat_priv->hna_lhash_lock); + + hna_buff_count++; + } + + /* initialize, and overwrite if malloc succeeds */ + orig_node->hna_buff = NULL; + orig_node->hna_buff_len = 0; + + if (hna_buff_len > 0) { + orig_node->hna_buff = kmalloc(hna_buff_len, GFP_ATOMIC); + if (orig_node->hna_buff) { + memcpy(orig_node->hna_buff, hna_buff, hna_buff_len); + orig_node->hna_buff_len = hna_buff_len; + } + } +} + +int hna_global_seq_print_text(struct seq_file *seq, void *offset) +{ + struct net_device *net_dev = (struct net_device *)seq->private; + struct bat_priv *bat_priv = netdev_priv(net_dev); + struct hashtable_t *hash = bat_priv->hna_global_hash; + struct hna_global_entry *hna_global_entry; + int i; + struct hlist_node *walk; + struct hlist_head *head; + struct element_t *bucket; + size_t buf_size, pos; + char *buff; + + if (!bat_priv->primary_if) { + return seq_printf(seq, "BATMAN mesh %s disabled - " + "please specify interfaces to enable it\n", + net_dev->name); + } + + seq_printf(seq, "Globally announced HNAs received via the mesh %s\n", + net_dev->name); + + spin_lock_bh(&bat_priv->hna_ghash_lock); + + buf_size = 1; + /* Estimate length for: " * xx:xx:xx:xx:xx:xx via xx:xx:xx:xx:xx:xx\n"*/ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each(walk, head) + buf_size += 43; + } + + buff = kmalloc(buf_size, GFP_ATOMIC); + if (!buff) { + spin_unlock_bh(&bat_priv->hna_ghash_lock); + return -ENOMEM; + } + buff[0] = '\0'; + pos = 0; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + hna_global_entry = bucket->data; + + pos += snprintf(buff + pos, 44, + " * %pM via %pM\n", + hna_global_entry->addr, + hna_global_entry->orig_node->orig); + } + } + + spin_unlock_bh(&bat_priv->hna_ghash_lock); + + seq_printf(seq, "%s", buff); + kfree(buff); + return 0; +} + +static void _hna_global_del_orig(struct bat_priv *bat_priv, + struct hna_global_entry *hna_global_entry, + char *message) +{ + bat_dbg(DBG_ROUTES, bat_priv, + "Deleting global hna entry %pM (via %pM): %s\n", + hna_global_entry->addr, hna_global_entry->orig_node->orig, + message); + + hash_remove(bat_priv->hna_global_hash, compare_orig, choose_orig, + hna_global_entry->addr); + kfree(hna_global_entry); +} + +void hna_global_del_orig(struct bat_priv *bat_priv, + struct orig_node *orig_node, char *message) +{ + struct hna_global_entry *hna_global_entry; + int hna_buff_count = 0; + unsigned char *hna_ptr; + + if (orig_node->hna_buff_len == 0) + return; + + spin_lock_bh(&bat_priv->hna_ghash_lock); + + while ((hna_buff_count + 1) * ETH_ALEN <= orig_node->hna_buff_len) { + hna_ptr = orig_node->hna_buff + (hna_buff_count * ETH_ALEN); + hna_global_entry = (struct hna_global_entry *) + hash_find(bat_priv->hna_global_hash, compare_orig, + choose_orig, hna_ptr); + + if ((hna_global_entry) && + (hna_global_entry->orig_node == orig_node)) + _hna_global_del_orig(bat_priv, hna_global_entry, + message); + + hna_buff_count++; + } + + spin_unlock_bh(&bat_priv->hna_ghash_lock); + + orig_node->hna_buff_len = 0; + kfree(orig_node->hna_buff); + orig_node->hna_buff = NULL; +} + +static void hna_global_del(void *data, void *arg) +{ + kfree(data); +} + +void hna_global_free(struct bat_priv *bat_priv) +{ + if (!bat_priv->hna_global_hash) + return; + + hash_delete(bat_priv->hna_global_hash, hna_global_del, NULL); + bat_priv->hna_global_hash = NULL; +} + +struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr) +{ + struct hna_global_entry *hna_global_entry; + + spin_lock_bh(&bat_priv->hna_ghash_lock); + hna_global_entry = (struct hna_global_entry *) + hash_find(bat_priv->hna_global_hash, + compare_orig, choose_orig, addr); + spin_unlock_bh(&bat_priv->hna_ghash_lock); + + if (!hna_global_entry) + return NULL; + + return hna_global_entry->orig_node; +} diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h new file mode 100644 index 0000000..10c4c5c --- /dev/null +++ b/net/batman-adv/translation-table.h @@ -0,0 +1,45 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ +#define _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ + +#include "types.h" + +int hna_local_init(struct bat_priv *bat_priv); +void hna_local_add(struct net_device *soft_iface, uint8_t *addr); +void hna_local_remove(struct bat_priv *bat_priv, + uint8_t *addr, char *message); +int hna_local_fill_buffer(struct bat_priv *bat_priv, + unsigned char *buff, int buff_len); +int hna_local_seq_print_text(struct seq_file *seq, void *offset); +void hna_local_free(struct bat_priv *bat_priv); +int hna_global_init(struct bat_priv *bat_priv); +void hna_global_add_orig(struct bat_priv *bat_priv, + struct orig_node *orig_node, + unsigned char *hna_buff, int hna_buff_len); +int hna_global_seq_print_text(struct seq_file *seq, void *offset); +void hna_global_del_orig(struct bat_priv *bat_priv, + struct orig_node *orig_node, char *message); +void hna_global_free(struct bat_priv *bat_priv); +struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr); + +#endif /* _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ */ diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h new file mode 100644 index 0000000..97cb23d --- /dev/null +++ b/net/batman-adv/types.h @@ -0,0 +1,271 @@ +/* + * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + + + +#ifndef _NET_BATMAN_ADV_TYPES_H_ +#define _NET_BATMAN_ADV_TYPES_H_ + +#include "packet.h" +#include "bitarray.h" + +#define BAT_HEADER_LEN (sizeof(struct ethhdr) + \ + ((sizeof(struct unicast_packet) > sizeof(struct bcast_packet) ? \ + sizeof(struct unicast_packet) : \ + sizeof(struct bcast_packet)))) + + +struct batman_if { + struct list_head list; + int16_t if_num; + char if_status; + struct net_device *net_dev; + atomic_t seqno; + atomic_t frag_seqno; + unsigned char *packet_buff; + int packet_len; + struct kobject *hardif_obj; + struct kref refcount; + struct packet_type batman_adv_ptype; + struct net_device *soft_iface; + struct rcu_head rcu; +}; + +/** + * orig_node - structure for orig_list maintaining nodes of mesh + * @primary_addr: hosts primary interface address + * @last_valid: when last packet from this node was received + * @bcast_seqno_reset: time when the broadcast seqno window was reset + * @batman_seqno_reset: time when the batman seqno window was reset + * @gw_flags: flags related to gateway class + * @flags: for now only VIS_SERVER flag + * @last_real_seqno: last and best known squence number + * @last_ttl: ttl of last received packet + * @last_bcast_seqno: last broadcast sequence number received by this host + * + * @candidates: how many candidates are available + * @selected: next bonding candidate + */ +struct orig_node { + uint8_t orig[ETH_ALEN]; + uint8_t primary_addr[ETH_ALEN]; + struct neigh_node *router; + unsigned long *bcast_own; + uint8_t *bcast_own_sum; + uint8_t tq_own; + int tq_asym_penalty; + unsigned long last_valid; + unsigned long bcast_seqno_reset; + unsigned long batman_seqno_reset; + uint8_t gw_flags; + uint8_t flags; + unsigned char *hna_buff; + int16_t hna_buff_len; + uint32_t last_real_seqno; + uint8_t last_ttl; + unsigned long bcast_bits[NUM_WORDS]; + uint32_t last_bcast_seqno; + struct list_head neigh_list; + struct list_head frag_list; + unsigned long last_frag_packet; + struct { + uint8_t candidates; + struct neigh_node *selected; + } bond; +}; + +struct gw_node { + struct hlist_node list; + struct orig_node *orig_node; + unsigned long deleted; + struct kref refcount; + struct rcu_head rcu; +}; + +/** + * neigh_node + * @last_valid: when last packet via this neighbor was received + */ +struct neigh_node { + struct list_head list; + uint8_t addr[ETH_ALEN]; + uint8_t real_packet_count; + uint8_t tq_recv[TQ_GLOBAL_WINDOW_SIZE]; + uint8_t tq_index; + uint8_t tq_avg; + uint8_t last_ttl; + struct neigh_node *next_bond_candidate; + unsigned long last_valid; + unsigned long real_bits[NUM_WORDS]; + struct orig_node *orig_node; + struct batman_if *if_incoming; +}; + + +struct bat_priv { + atomic_t mesh_state; + struct net_device_stats stats; + atomic_t aggregated_ogms; /* boolean */ + atomic_t bonding; /* boolean */ + atomic_t fragmentation; /* boolean */ + atomic_t vis_mode; /* VIS_TYPE_* */ + atomic_t gw_mode; /* GW_MODE_* */ + atomic_t gw_sel_class; /* uint */ + atomic_t gw_bandwidth; /* gw bandwidth */ + atomic_t orig_interval; /* uint */ + atomic_t hop_penalty; /* uint */ + atomic_t log_level; /* uint */ + atomic_t bcast_seqno; + atomic_t bcast_queue_left; + atomic_t batman_queue_left; + char num_ifaces; + struct hlist_head softif_neigh_list; + struct softif_neigh *softif_neigh; + struct debug_log *debug_log; + struct batman_if *primary_if; + struct kobject *mesh_obj; + struct dentry *debug_dir; + struct hlist_head forw_bat_list; + struct hlist_head forw_bcast_list; + struct hlist_head gw_list; + struct list_head vis_send_list; + struct hashtable_t *orig_hash; + struct hashtable_t *hna_local_hash; + struct hashtable_t *hna_global_hash; + struct hashtable_t *vis_hash; + spinlock_t orig_hash_lock; /* protects orig_hash */ + spinlock_t forw_bat_list_lock; /* protects forw_bat_list */ + spinlock_t forw_bcast_list_lock; /* protects */ + spinlock_t hna_lhash_lock; /* protects hna_local_hash */ + spinlock_t hna_ghash_lock; /* protects hna_global_hash */ + spinlock_t gw_list_lock; /* protects gw_list */ + spinlock_t vis_hash_lock; /* protects vis_hash */ + spinlock_t vis_list_lock; /* protects vis_info::recv_list */ + spinlock_t softif_neigh_lock; /* protects soft-interface neigh list */ + int16_t num_local_hna; + atomic_t hna_local_changed; + struct delayed_work hna_work; + struct delayed_work orig_work; + struct delayed_work vis_work; + struct gw_node *curr_gw; + struct vis_info *my_vis_info; +}; + +struct socket_client { + struct list_head queue_list; + unsigned int queue_len; + unsigned char index; + spinlock_t lock; /* protects queue_list, queue_len, index */ + wait_queue_head_t queue_wait; + struct bat_priv *bat_priv; +}; + +struct socket_packet { + struct list_head list; + size_t icmp_len; + struct icmp_packet_rr icmp_packet; +}; + +struct hna_local_entry { + uint8_t addr[ETH_ALEN]; + unsigned long last_seen; + char never_purge; +}; + +struct hna_global_entry { + uint8_t addr[ETH_ALEN]; + struct orig_node *orig_node; +}; + +/** + * forw_packet - structure for forw_list maintaining packets to be + * send/forwarded + */ +struct forw_packet { + struct hlist_node list; + unsigned long send_time; + uint8_t own; + struct sk_buff *skb; + uint16_t packet_len; + uint32_t direct_link_flags; + uint8_t num_packets; + struct delayed_work delayed_work; + struct batman_if *if_incoming; +}; + +/* While scanning for vis-entries of a particular vis-originator + * this list collects its interfaces to create a subgraph/cluster + * out of them later + */ +struct if_list_entry { + uint8_t addr[ETH_ALEN]; + bool primary; + struct hlist_node list; +}; + +struct debug_log { + char log_buff[LOG_BUF_LEN]; + unsigned long log_start; + unsigned long log_end; + spinlock_t lock; /* protects log_buff, log_start and log_end */ + wait_queue_head_t queue_wait; +}; + +struct frag_packet_list_entry { + struct list_head list; + uint16_t seqno; + struct sk_buff *skb; +}; + +struct vis_info { + unsigned long first_seen; + struct list_head recv_list; + /* list of server-neighbors we received a vis-packet + * from. we should not reply to them. */ + struct list_head send_list; + struct kref refcount; + struct bat_priv *bat_priv; + /* this packet might be part of the vis send queue. */ + struct sk_buff *skb_packet; + /* vis_info may follow here*/ +} __attribute__((packed)); + +struct vis_info_entry { + uint8_t src[ETH_ALEN]; + uint8_t dest[ETH_ALEN]; + uint8_t quality; /* quality = 0 means HNA */ +} __attribute__((packed)); + +struct recvlist_node { + struct list_head list; + uint8_t mac[ETH_ALEN]; +}; + +struct softif_neigh { + struct hlist_node list; + uint8_t addr[ETH_ALEN]; + unsigned long last_seen; + short vid; + struct kref refcount; + struct rcu_head rcu; +}; + +#endif /* _NET_BATMAN_ADV_TYPES_H_ */ diff --git a/net/batman-adv/unicast.c b/net/batman-adv/unicast.c new file mode 100644 index 0000000..dc2e28b --- /dev/null +++ b/net/batman-adv/unicast.c @@ -0,0 +1,343 @@ +/* + * Copyright (C) 2010 B.A.T.M.A.N. contributors: + * + * Andreas Langer + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "unicast.h" +#include "send.h" +#include "soft-interface.h" +#include "gateway_client.h" +#include "originator.h" +#include "hash.h" +#include "translation-table.h" +#include "routing.h" +#include "hard-interface.h" + + +static struct sk_buff *frag_merge_packet(struct list_head *head, + struct frag_packet_list_entry *tfp, + struct sk_buff *skb) +{ + struct unicast_frag_packet *up = + (struct unicast_frag_packet *)skb->data; + struct sk_buff *tmp_skb; + struct unicast_packet *unicast_packet; + int hdr_len = sizeof(struct unicast_packet), + uni_diff = sizeof(struct unicast_frag_packet) - hdr_len; + + /* set skb to the first part and tmp_skb to the second part */ + if (up->flags & UNI_FRAG_HEAD) { + tmp_skb = tfp->skb; + } else { + tmp_skb = skb; + skb = tfp->skb; + } + + skb_pull(tmp_skb, sizeof(struct unicast_frag_packet)); + if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0) { + /* free buffered skb, skb will be freed later */ + kfree_skb(tfp->skb); + return NULL; + } + + /* move free entry to end */ + tfp->skb = NULL; + tfp->seqno = 0; + list_move_tail(&tfp->list, head); + + memcpy(skb_put(skb, tmp_skb->len), tmp_skb->data, tmp_skb->len); + kfree_skb(tmp_skb); + + memmove(skb->data + uni_diff, skb->data, hdr_len); + unicast_packet = (struct unicast_packet *) skb_pull(skb, uni_diff); + unicast_packet->packet_type = BAT_UNICAST; + + return skb; +} + +static void frag_create_entry(struct list_head *head, struct sk_buff *skb) +{ + struct frag_packet_list_entry *tfp; + struct unicast_frag_packet *up = + (struct unicast_frag_packet *)skb->data; + + /* free and oldest packets stand at the end */ + tfp = list_entry((head)->prev, typeof(*tfp), list); + kfree_skb(tfp->skb); + + tfp->seqno = ntohs(up->seqno); + tfp->skb = skb; + list_move(&tfp->list, head); + return; +} + +static int frag_create_buffer(struct list_head *head) +{ + int i; + struct frag_packet_list_entry *tfp; + + for (i = 0; i < FRAG_BUFFER_SIZE; i++) { + tfp = kmalloc(sizeof(struct frag_packet_list_entry), + GFP_ATOMIC); + if (!tfp) { + frag_list_free(head); + return -ENOMEM; + } + tfp->skb = NULL; + tfp->seqno = 0; + INIT_LIST_HEAD(&tfp->list); + list_add(&tfp->list, head); + } + + return 0; +} + +static struct frag_packet_list_entry *frag_search_packet(struct list_head *head, + struct unicast_frag_packet *up) +{ + struct frag_packet_list_entry *tfp; + struct unicast_frag_packet *tmp_up = NULL; + uint16_t search_seqno; + + if (up->flags & UNI_FRAG_HEAD) + search_seqno = ntohs(up->seqno)+1; + else + search_seqno = ntohs(up->seqno)-1; + + list_for_each_entry(tfp, head, list) { + + if (!tfp->skb) + continue; + + if (tfp->seqno == ntohs(up->seqno)) + goto mov_tail; + + tmp_up = (struct unicast_frag_packet *)tfp->skb->data; + + if (tfp->seqno == search_seqno) { + + if ((tmp_up->flags & UNI_FRAG_HEAD) != + (up->flags & UNI_FRAG_HEAD)) + return tfp; + else + goto mov_tail; + } + } + return NULL; + +mov_tail: + list_move_tail(&tfp->list, head); + return NULL; +} + +void frag_list_free(struct list_head *head) +{ + struct frag_packet_list_entry *pf, *tmp_pf; + + if (!list_empty(head)) { + + list_for_each_entry_safe(pf, tmp_pf, head, list) { + kfree_skb(pf->skb); + list_del(&pf->list); + kfree(pf); + } + } + return; +} + +/* frag_reassemble_skb(): + * returns NET_RX_DROP if the operation failed - skb is left intact + * returns NET_RX_SUCCESS if the fragment was buffered (skb_new will be NULL) + * or the skb could be reassembled (skb_new will point to the new packet and + * skb was freed) + */ +int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv, + struct sk_buff **new_skb) +{ + struct orig_node *orig_node; + struct frag_packet_list_entry *tmp_frag_entry; + int ret = NET_RX_DROP; + struct unicast_frag_packet *unicast_packet = + (struct unicast_frag_packet *)skb->data; + + *new_skb = NULL; + spin_lock_bh(&bat_priv->orig_hash_lock); + orig_node = ((struct orig_node *) + hash_find(bat_priv->orig_hash, compare_orig, choose_orig, + unicast_packet->orig)); + + if (!orig_node) { + pr_debug("couldn't find originator in orig_hash\n"); + goto out; + } + + orig_node->last_frag_packet = jiffies; + + if (list_empty(&orig_node->frag_list) && + frag_create_buffer(&orig_node->frag_list)) { + pr_debug("couldn't create frag buffer\n"); + goto out; + } + + tmp_frag_entry = frag_search_packet(&orig_node->frag_list, + unicast_packet); + + if (!tmp_frag_entry) { + frag_create_entry(&orig_node->frag_list, skb); + ret = NET_RX_SUCCESS; + goto out; + } + + *new_skb = frag_merge_packet(&orig_node->frag_list, tmp_frag_entry, + skb); + /* if not, merge failed */ + if (*new_skb) + ret = NET_RX_SUCCESS; +out: + spin_unlock_bh(&bat_priv->orig_hash_lock); + + return ret; +} + +int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv, + struct batman_if *batman_if, uint8_t dstaddr[]) +{ + struct unicast_packet tmp_uc, *unicast_packet; + struct sk_buff *frag_skb; + struct unicast_frag_packet *frag1, *frag2; + int uc_hdr_len = sizeof(struct unicast_packet); + int ucf_hdr_len = sizeof(struct unicast_frag_packet); + int data_len = skb->len; + + if (!bat_priv->primary_if) + goto dropped; + + unicast_packet = (struct unicast_packet *) skb->data; + + memcpy(&tmp_uc, unicast_packet, uc_hdr_len); + frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len); + skb_split(skb, frag_skb, data_len / 2); + + if (my_skb_head_push(skb, ucf_hdr_len - uc_hdr_len) < 0 || + my_skb_head_push(frag_skb, ucf_hdr_len) < 0) + goto drop_frag; + + frag1 = (struct unicast_frag_packet *)skb->data; + frag2 = (struct unicast_frag_packet *)frag_skb->data; + + memcpy(frag1, &tmp_uc, sizeof(struct unicast_packet)); + + frag1->ttl--; + frag1->version = COMPAT_VERSION; + frag1->packet_type = BAT_UNICAST_FRAG; + + memcpy(frag1->orig, bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); + memcpy(frag2, frag1, sizeof(struct unicast_frag_packet)); + + frag1->flags |= UNI_FRAG_HEAD; + frag2->flags &= ~UNI_FRAG_HEAD; + + frag1->seqno = htons((uint16_t)atomic_inc_return( + &batman_if->frag_seqno)); + frag2->seqno = htons((uint16_t)atomic_inc_return( + &batman_if->frag_seqno)); + + send_skb_packet(skb, batman_if, dstaddr); + send_skb_packet(frag_skb, batman_if, dstaddr); + return NET_RX_SUCCESS; + +drop_frag: + kfree_skb(frag_skb); +dropped: + kfree_skb(skb); + return NET_RX_DROP; +} + +int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv) +{ + struct ethhdr *ethhdr = (struct ethhdr *)skb->data; + struct unicast_packet *unicast_packet; + struct orig_node *orig_node; + struct batman_if *batman_if; + struct neigh_node *router; + int data_len = skb->len; + uint8_t dstaddr[6]; + + spin_lock_bh(&bat_priv->orig_hash_lock); + + /* get routing information */ + if (is_multicast_ether_addr(ethhdr->h_dest)) + orig_node = (struct orig_node *)gw_get_selected(bat_priv); + else + orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash, + compare_orig, + choose_orig, + ethhdr->h_dest)); + + /* check for hna host */ + if (!orig_node) + orig_node = transtable_search(bat_priv, ethhdr->h_dest); + + router = find_router(bat_priv, orig_node, NULL); + + if (!router) + goto unlock; + + /* don't lock while sending the packets ... we therefore + * copy the required data before sending */ + + batman_if = router->if_incoming; + memcpy(dstaddr, router->addr, ETH_ALEN); + + spin_unlock_bh(&bat_priv->orig_hash_lock); + + if (batman_if->if_status != IF_ACTIVE) + goto dropped; + + if (my_skb_head_push(skb, sizeof(struct unicast_packet)) < 0) + goto dropped; + + unicast_packet = (struct unicast_packet *)skb->data; + + unicast_packet->version = COMPAT_VERSION; + /* batman packet type: unicast */ + unicast_packet->packet_type = BAT_UNICAST; + /* set unicast ttl */ + unicast_packet->ttl = TTL; + /* copy the destination for faster routing */ + memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN); + + if (atomic_read(&bat_priv->fragmentation) && + data_len + sizeof(struct unicast_packet) > + batman_if->net_dev->mtu) { + /* send frag skb decreases ttl */ + unicast_packet->ttl++; + return frag_send_skb(skb, bat_priv, batman_if, + dstaddr); + } + send_skb_packet(skb, batman_if, dstaddr); + return 0; + +unlock: + spin_unlock_bh(&bat_priv->orig_hash_lock); +dropped: + kfree_skb(skb); + return 1; +} diff --git a/net/batman-adv/unicast.h b/net/batman-adv/unicast.h new file mode 100644 index 0000000..e32b786 --- /dev/null +++ b/net/batman-adv/unicast.h @@ -0,0 +1,35 @@ +/* + * Copyright (C) 2010 B.A.T.M.A.N. contributors: + * + * Andreas Langer + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_UNICAST_H_ +#define _NET_BATMAN_ADV_UNICAST_H_ + +#define FRAG_TIMEOUT 10000 /* purge frag list entrys after time in ms */ +#define FRAG_BUFFER_SIZE 6 /* number of list elements in buffer */ + +int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv, + struct sk_buff **new_skb); +void frag_list_free(struct list_head *head); +int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv); +int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv, + struct batman_if *batman_if, uint8_t dstaddr[]); + +#endif /* _NET_BATMAN_ADV_UNICAST_H_ */ diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c new file mode 100644 index 0000000..cd4c423 --- /dev/null +++ b/net/batman-adv/vis.c @@ -0,0 +1,949 @@ +/* + * Copyright (C) 2008-2010 B.A.T.M.A.N. contributors: + * + * Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "send.h" +#include "translation-table.h" +#include "vis.h" +#include "soft-interface.h" +#include "hard-interface.h" +#include "hash.h" +#include "originator.h" + +#define MAX_VIS_PACKET_SIZE 1000 + +/* Returns the smallest signed integer in two's complement with the sizeof x */ +#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u))) + +/* Checks if a sequence number x is a predecessor/successor of y. + * they handle overflows/underflows and can correctly check for a + * predecessor/successor unless the variable sequence number has grown by + * more then 2**(bitwidth(x)-1)-1. + * This means that for a uint8_t with the maximum value 255, it would think: + * - when adding nothing - it is neither a predecessor nor a successor + * - before adding more than 127 to the starting value - it is a predecessor, + * - when adding 128 - it is neither a predecessor nor a successor, + * - after adding more than 127 to the starting value - it is a successor */ +#define seq_before(x, y) ({typeof(x) _dummy = (x - y); \ + _dummy > smallest_signed_int(_dummy); }) +#define seq_after(x, y) seq_before(y, x) + +static void start_vis_timer(struct bat_priv *bat_priv); + +/* free the info */ +static void free_info(struct kref *ref) +{ + struct vis_info *info = container_of(ref, struct vis_info, refcount); + struct bat_priv *bat_priv = info->bat_priv; + struct recvlist_node *entry, *tmp; + + list_del_init(&info->send_list); + spin_lock_bh(&bat_priv->vis_list_lock); + list_for_each_entry_safe(entry, tmp, &info->recv_list, list) { + list_del(&entry->list); + kfree(entry); + } + + spin_unlock_bh(&bat_priv->vis_list_lock); + kfree_skb(info->skb_packet); +} + +/* Compare two vis packets, used by the hashing algorithm */ +static int vis_info_cmp(void *data1, void *data2) +{ + struct vis_info *d1, *d2; + struct vis_packet *p1, *p2; + d1 = data1; + d2 = data2; + p1 = (struct vis_packet *)d1->skb_packet->data; + p2 = (struct vis_packet *)d2->skb_packet->data; + return compare_orig(p1->vis_orig, p2->vis_orig); +} + +/* hash function to choose an entry in a hash table of given size */ +/* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */ +static int vis_info_choose(void *data, int size) +{ + struct vis_info *vis_info = data; + struct vis_packet *packet; + unsigned char *key; + uint32_t hash = 0; + size_t i; + + packet = (struct vis_packet *)vis_info->skb_packet->data; + key = packet->vis_orig; + for (i = 0; i < ETH_ALEN; i++) { + hash += key[i]; + hash += (hash << 10); + hash ^= (hash >> 6); + } + + hash += (hash << 3); + hash ^= (hash >> 11); + hash += (hash << 15); + + return hash % size; +} + +/* insert interface to the list of interfaces of one originator, if it + * does not already exist in the list */ +static void vis_data_insert_interface(const uint8_t *interface, + struct hlist_head *if_list, + bool primary) +{ + struct if_list_entry *entry; + struct hlist_node *pos; + + hlist_for_each_entry(entry, pos, if_list, list) { + if (compare_orig(entry->addr, (void *)interface)) + return; + } + + /* its a new address, add it to the list */ + entry = kmalloc(sizeof(*entry), GFP_ATOMIC); + if (!entry) + return; + memcpy(entry->addr, interface, ETH_ALEN); + entry->primary = primary; + hlist_add_head(&entry->list, if_list); +} + +static ssize_t vis_data_read_prim_sec(char *buff, struct hlist_head *if_list) +{ + struct if_list_entry *entry; + struct hlist_node *pos; + size_t len = 0; + + hlist_for_each_entry(entry, pos, if_list, list) { + if (entry->primary) + len += sprintf(buff + len, "PRIMARY, "); + else + len += sprintf(buff + len, "SEC %pM, ", entry->addr); + } + + return len; +} + +static size_t vis_data_count_prim_sec(struct hlist_head *if_list) +{ + struct if_list_entry *entry; + struct hlist_node *pos; + size_t count = 0; + + hlist_for_each_entry(entry, pos, if_list, list) { + if (entry->primary) + count += 9; + else + count += 23; + } + + return count; +} + +/* read an entry */ +static ssize_t vis_data_read_entry(char *buff, struct vis_info_entry *entry, + uint8_t *src, bool primary) +{ + /* maximal length: max(4+17+2, 3+17+1+3+2) == 26 */ + if (primary && entry->quality == 0) + return sprintf(buff, "HNA %pM, ", entry->dest); + else if (compare_orig(entry->src, src)) + return sprintf(buff, "TQ %pM %d, ", entry->dest, + entry->quality); + + return 0; +} + +int vis_seq_print_text(struct seq_file *seq, void *offset) +{ + struct hlist_node *walk; + struct hlist_head *head; + struct element_t *bucket; + struct vis_info *info; + struct vis_packet *packet; + struct vis_info_entry *entries; + struct net_device *net_dev = (struct net_device *)seq->private; + struct bat_priv *bat_priv = netdev_priv(net_dev); + struct hashtable_t *hash = bat_priv->vis_hash; + HLIST_HEAD(vis_if_list); + struct if_list_entry *entry; + struct hlist_node *pos, *n; + int i, j; + int vis_server = atomic_read(&bat_priv->vis_mode); + size_t buff_pos, buf_size; + char *buff; + int compare; + + if ((!bat_priv->primary_if) || + (vis_server == VIS_TYPE_CLIENT_UPDATE)) + return 0; + + buf_size = 1; + /* Estimate length */ + spin_lock_bh(&bat_priv->vis_hash_lock); + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + info = bucket->data; + packet = (struct vis_packet *)info->skb_packet->data; + entries = (struct vis_info_entry *) + ((char *)packet + sizeof(struct vis_packet)); + + for (j = 0; j < packet->entries; j++) { + if (entries[j].quality == 0) + continue; + compare = + compare_orig(entries[j].src, packet->vis_orig); + vis_data_insert_interface(entries[j].src, + &vis_if_list, + compare); + } + + hlist_for_each_entry(entry, pos, &vis_if_list, list) { + buf_size += 18 + 26 * packet->entries; + + /* add primary/secondary records */ + if (compare_orig(entry->addr, packet->vis_orig)) + buf_size += + vis_data_count_prim_sec(&vis_if_list); + + buf_size += 1; + } + + hlist_for_each_entry_safe(entry, pos, n, &vis_if_list, + list) { + hlist_del(&entry->list); + kfree(entry); + } + } + } + + buff = kmalloc(buf_size, GFP_ATOMIC); + if (!buff) { + spin_unlock_bh(&bat_priv->vis_hash_lock); + return -ENOMEM; + } + buff[0] = '\0'; + buff_pos = 0; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + info = bucket->data; + packet = (struct vis_packet *)info->skb_packet->data; + entries = (struct vis_info_entry *) + ((char *)packet + sizeof(struct vis_packet)); + + for (j = 0; j < packet->entries; j++) { + if (entries[j].quality == 0) + continue; + compare = + compare_orig(entries[j].src, packet->vis_orig); + vis_data_insert_interface(entries[j].src, + &vis_if_list, + compare); + } + + hlist_for_each_entry(entry, pos, &vis_if_list, list) { + buff_pos += sprintf(buff + buff_pos, "%pM,", + entry->addr); + + for (i = 0; i < packet->entries; i++) + buff_pos += vis_data_read_entry( + buff + buff_pos, + &entries[i], + entry->addr, + entry->primary); + + /* add primary/secondary records */ + if (compare_orig(entry->addr, packet->vis_orig)) + buff_pos += + vis_data_read_prim_sec(buff + buff_pos, + &vis_if_list); + + buff_pos += sprintf(buff + buff_pos, "\n"); + } + + hlist_for_each_entry_safe(entry, pos, n, &vis_if_list, + list) { + hlist_del(&entry->list); + kfree(entry); + } + } + } + + spin_unlock_bh(&bat_priv->vis_hash_lock); + + seq_printf(seq, "%s", buff); + kfree(buff); + + return 0; +} + +/* add the info packet to the send list, if it was not + * already linked in. */ +static void send_list_add(struct bat_priv *bat_priv, struct vis_info *info) +{ + if (list_empty(&info->send_list)) { + kref_get(&info->refcount); + list_add_tail(&info->send_list, &bat_priv->vis_send_list); + } +} + +/* delete the info packet from the send list, if it was + * linked in. */ +static void send_list_del(struct vis_info *info) +{ + if (!list_empty(&info->send_list)) { + list_del_init(&info->send_list); + kref_put(&info->refcount, free_info); + } +} + +/* tries to add one entry to the receive list. */ +static void recv_list_add(struct bat_priv *bat_priv, + struct list_head *recv_list, char *mac) +{ + struct recvlist_node *entry; + + entry = kmalloc(sizeof(struct recvlist_node), GFP_ATOMIC); + if (!entry) + return; + + memcpy(entry->mac, mac, ETH_ALEN); + spin_lock_bh(&bat_priv->vis_list_lock); + list_add_tail(&entry->list, recv_list); + spin_unlock_bh(&bat_priv->vis_list_lock); +} + +/* returns 1 if this mac is in the recv_list */ +static int recv_list_is_in(struct bat_priv *bat_priv, + struct list_head *recv_list, char *mac) +{ + struct recvlist_node *entry; + + spin_lock_bh(&bat_priv->vis_list_lock); + list_for_each_entry(entry, recv_list, list) { + if (memcmp(entry->mac, mac, ETH_ALEN) == 0) { + spin_unlock_bh(&bat_priv->vis_list_lock); + return 1; + } + } + spin_unlock_bh(&bat_priv->vis_list_lock); + return 0; +} + +/* try to add the packet to the vis_hash. return NULL if invalid (e.g. too old, + * broken.. ). vis hash must be locked outside. is_new is set when the packet + * is newer than old entries in the hash. */ +static struct vis_info *add_packet(struct bat_priv *bat_priv, + struct vis_packet *vis_packet, + int vis_info_len, int *is_new, + int make_broadcast) +{ + struct vis_info *info, *old_info; + struct vis_packet *search_packet, *old_packet; + struct vis_info search_elem; + struct vis_packet *packet; + int hash_added; + + *is_new = 0; + /* sanity check */ + if (!bat_priv->vis_hash) + return NULL; + + /* see if the packet is already in vis_hash */ + search_elem.skb_packet = dev_alloc_skb(sizeof(struct vis_packet)); + if (!search_elem.skb_packet) + return NULL; + search_packet = (struct vis_packet *)skb_put(search_elem.skb_packet, + sizeof(struct vis_packet)); + + memcpy(search_packet->vis_orig, vis_packet->vis_orig, ETH_ALEN); + old_info = hash_find(bat_priv->vis_hash, vis_info_cmp, vis_info_choose, + &search_elem); + kfree_skb(search_elem.skb_packet); + + if (old_info) { + old_packet = (struct vis_packet *)old_info->skb_packet->data; + if (!seq_after(ntohl(vis_packet->seqno), + ntohl(old_packet->seqno))) { + if (old_packet->seqno == vis_packet->seqno) { + recv_list_add(bat_priv, &old_info->recv_list, + vis_packet->sender_orig); + return old_info; + } else { + /* newer packet is already in hash. */ + return NULL; + } + } + /* remove old entry */ + hash_remove(bat_priv->vis_hash, vis_info_cmp, vis_info_choose, + old_info); + send_list_del(old_info); + kref_put(&old_info->refcount, free_info); + } + + info = kmalloc(sizeof(struct vis_info), GFP_ATOMIC); + if (!info) + return NULL; + + info->skb_packet = dev_alloc_skb(sizeof(struct vis_packet) + + vis_info_len + sizeof(struct ethhdr)); + if (!info->skb_packet) { + kfree(info); + return NULL; + } + skb_reserve(info->skb_packet, sizeof(struct ethhdr)); + packet = (struct vis_packet *)skb_put(info->skb_packet, + sizeof(struct vis_packet) + + vis_info_len); + + kref_init(&info->refcount); + INIT_LIST_HEAD(&info->send_list); + INIT_LIST_HEAD(&info->recv_list); + info->first_seen = jiffies; + info->bat_priv = bat_priv; + memcpy(packet, vis_packet, sizeof(struct vis_packet) + vis_info_len); + + /* initialize and add new packet. */ + *is_new = 1; + + /* Make it a broadcast packet, if required */ + if (make_broadcast) + memcpy(packet->target_orig, broadcast_addr, ETH_ALEN); + + /* repair if entries is longer than packet. */ + if (packet->entries * sizeof(struct vis_info_entry) > vis_info_len) + packet->entries = vis_info_len / sizeof(struct vis_info_entry); + + recv_list_add(bat_priv, &info->recv_list, packet->sender_orig); + + /* try to add it */ + hash_added = hash_add(bat_priv->vis_hash, vis_info_cmp, vis_info_choose, + info); + if (hash_added < 0) { + /* did not work (for some reason) */ + kref_put(&old_info->refcount, free_info); + info = NULL; + } + + return info; +} + +/* handle the server sync packet, forward if needed. */ +void receive_server_sync_packet(struct bat_priv *bat_priv, + struct vis_packet *vis_packet, + int vis_info_len) +{ + struct vis_info *info; + int is_new, make_broadcast; + int vis_server = atomic_read(&bat_priv->vis_mode); + + make_broadcast = (vis_server == VIS_TYPE_SERVER_SYNC); + + spin_lock_bh(&bat_priv->vis_hash_lock); + info = add_packet(bat_priv, vis_packet, vis_info_len, + &is_new, make_broadcast); + if (!info) + goto end; + + /* only if we are server ourselves and packet is newer than the one in + * hash.*/ + if (vis_server == VIS_TYPE_SERVER_SYNC && is_new) + send_list_add(bat_priv, info); +end: + spin_unlock_bh(&bat_priv->vis_hash_lock); +} + +/* handle an incoming client update packet and schedule forward if needed. */ +void receive_client_update_packet(struct bat_priv *bat_priv, + struct vis_packet *vis_packet, + int vis_info_len) +{ + struct vis_info *info; + struct vis_packet *packet; + int is_new; + int vis_server = atomic_read(&bat_priv->vis_mode); + int are_target = 0; + + /* clients shall not broadcast. */ + if (is_broadcast_ether_addr(vis_packet->target_orig)) + return; + + /* Are we the target for this VIS packet? */ + if (vis_server == VIS_TYPE_SERVER_SYNC && + is_my_mac(vis_packet->target_orig)) + are_target = 1; + + spin_lock_bh(&bat_priv->vis_hash_lock); + info = add_packet(bat_priv, vis_packet, vis_info_len, + &is_new, are_target); + + if (!info) + goto end; + /* note that outdated packets will be dropped at this point. */ + + packet = (struct vis_packet *)info->skb_packet->data; + + /* send only if we're the target server or ... */ + if (are_target && is_new) { + packet->vis_type = VIS_TYPE_SERVER_SYNC; /* upgrade! */ + send_list_add(bat_priv, info); + + /* ... we're not the recipient (and thus need to forward). */ + } else if (!is_my_mac(packet->target_orig)) { + send_list_add(bat_priv, info); + } + +end: + spin_unlock_bh(&bat_priv->vis_hash_lock); +} + +/* Walk the originators and find the VIS server with the best tq. Set the packet + * address to its address and return the best_tq. + * + * Must be called with the originator hash locked */ +static int find_best_vis_server(struct bat_priv *bat_priv, + struct vis_info *info) +{ + struct hashtable_t *hash = bat_priv->orig_hash; + struct hlist_node *walk; + struct hlist_head *head; + struct element_t *bucket; + struct orig_node *orig_node; + struct vis_packet *packet; + int best_tq = -1, i; + + packet = (struct vis_packet *)info->skb_packet->data; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + orig_node = bucket->data; + if ((orig_node) && (orig_node->router) && + (orig_node->flags & VIS_SERVER) && + (orig_node->router->tq_avg > best_tq)) { + best_tq = orig_node->router->tq_avg; + memcpy(packet->target_orig, orig_node->orig, + ETH_ALEN); + } + } + } + + return best_tq; +} + +/* Return true if the vis packet is full. */ +static bool vis_packet_full(struct vis_info *info) +{ + struct vis_packet *packet; + packet = (struct vis_packet *)info->skb_packet->data; + + if (MAX_VIS_PACKET_SIZE / sizeof(struct vis_info_entry) + < packet->entries + 1) + return true; + return false; +} + +/* generates a packet of own vis data, + * returns 0 on success, -1 if no packet could be generated */ +static int generate_vis_packet(struct bat_priv *bat_priv) +{ + struct hashtable_t *hash = bat_priv->orig_hash; + struct hlist_node *walk; + struct hlist_head *head; + struct element_t *bucket; + struct orig_node *orig_node; + struct neigh_node *neigh_node; + struct vis_info *info = (struct vis_info *)bat_priv->my_vis_info; + struct vis_packet *packet = (struct vis_packet *)info->skb_packet->data; + struct vis_info_entry *entry; + struct hna_local_entry *hna_local_entry; + int best_tq = -1, i; + + info->first_seen = jiffies; + packet->vis_type = atomic_read(&bat_priv->vis_mode); + + spin_lock_bh(&bat_priv->orig_hash_lock); + memcpy(packet->target_orig, broadcast_addr, ETH_ALEN); + packet->ttl = TTL; + packet->seqno = htonl(ntohl(packet->seqno) + 1); + packet->entries = 0; + skb_trim(info->skb_packet, sizeof(struct vis_packet)); + + if (packet->vis_type == VIS_TYPE_CLIENT_UPDATE) { + best_tq = find_best_vis_server(bat_priv, info); + + if (best_tq < 0) { + spin_unlock_bh(&bat_priv->orig_hash_lock); + return -1; + } + } + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + orig_node = bucket->data; + neigh_node = orig_node->router; + + if (!neigh_node) + continue; + + if (!compare_orig(neigh_node->addr, orig_node->orig)) + continue; + + if (neigh_node->if_incoming->if_status != IF_ACTIVE) + continue; + + if (neigh_node->tq_avg < 1) + continue; + + /* fill one entry into buffer. */ + entry = (struct vis_info_entry *) + skb_put(info->skb_packet, sizeof(*entry)); + memcpy(entry->src, + neigh_node->if_incoming->net_dev->dev_addr, + ETH_ALEN); + memcpy(entry->dest, orig_node->orig, ETH_ALEN); + entry->quality = neigh_node->tq_avg; + packet->entries++; + + if (vis_packet_full(info)) { + spin_unlock_bh(&bat_priv->orig_hash_lock); + return 0; + } + } + } + + spin_unlock_bh(&bat_priv->orig_hash_lock); + + hash = bat_priv->hna_local_hash; + + spin_lock_bh(&bat_priv->hna_lhash_lock); + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + hna_local_entry = bucket->data; + entry = (struct vis_info_entry *) + skb_put(info->skb_packet, + sizeof(*entry)); + memset(entry->src, 0, ETH_ALEN); + memcpy(entry->dest, hna_local_entry->addr, ETH_ALEN); + entry->quality = 0; /* 0 means HNA */ + packet->entries++; + + if (vis_packet_full(info)) { + spin_unlock_bh(&bat_priv->hna_lhash_lock); + return 0; + } + } + } + + spin_unlock_bh(&bat_priv->hna_lhash_lock); + return 0; +} + +/* free old vis packets. Must be called with this vis_hash_lock + * held */ +static void purge_vis_packets(struct bat_priv *bat_priv) +{ + int i; + struct hashtable_t *hash = bat_priv->vis_hash; + struct hlist_node *walk, *safe; + struct hlist_head *head; + struct element_t *bucket; + struct vis_info *info; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) { + info = bucket->data; + + /* never purge own data. */ + if (info == bat_priv->my_vis_info) + continue; + + if (time_after(jiffies, + info->first_seen + VIS_TIMEOUT * HZ)) { + hlist_del(walk); + kfree(bucket); + send_list_del(info); + kref_put(&info->refcount, free_info); + } + } + } +} + +static void broadcast_vis_packet(struct bat_priv *bat_priv, + struct vis_info *info) +{ + struct hashtable_t *hash = bat_priv->orig_hash; + struct hlist_node *walk; + struct hlist_head *head; + struct element_t *bucket; + struct orig_node *orig_node; + struct vis_packet *packet; + struct sk_buff *skb; + struct batman_if *batman_if; + uint8_t dstaddr[ETH_ALEN]; + int i; + + + spin_lock_bh(&bat_priv->orig_hash_lock); + packet = (struct vis_packet *)info->skb_packet->data; + + /* send to all routers in range. */ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry(bucket, walk, head, hlist) { + orig_node = bucket->data; + + /* if it's a vis server and reachable, send it. */ + if ((!orig_node) || (!orig_node->router)) + continue; + if (!(orig_node->flags & VIS_SERVER)) + continue; + /* don't send it if we already received the packet from + * this node. */ + if (recv_list_is_in(bat_priv, &info->recv_list, + orig_node->orig)) + continue; + + memcpy(packet->target_orig, orig_node->orig, ETH_ALEN); + batman_if = orig_node->router->if_incoming; + memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); + spin_unlock_bh(&bat_priv->orig_hash_lock); + + skb = skb_clone(info->skb_packet, GFP_ATOMIC); + if (skb) + send_skb_packet(skb, batman_if, dstaddr); + + spin_lock_bh(&bat_priv->orig_hash_lock); + } + + } + + spin_unlock_bh(&bat_priv->orig_hash_lock); +} + +static void unicast_vis_packet(struct bat_priv *bat_priv, + struct vis_info *info) +{ + struct orig_node *orig_node; + struct sk_buff *skb; + struct vis_packet *packet; + struct batman_if *batman_if; + uint8_t dstaddr[ETH_ALEN]; + + spin_lock_bh(&bat_priv->orig_hash_lock); + packet = (struct vis_packet *)info->skb_packet->data; + orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash, + compare_orig, choose_orig, + packet->target_orig)); + + if ((!orig_node) || (!orig_node->router)) + goto out; + + /* don't lock while sending the packets ... we therefore + * copy the required data before sending */ + batman_if = orig_node->router->if_incoming; + memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); + spin_unlock_bh(&bat_priv->orig_hash_lock); + + skb = skb_clone(info->skb_packet, GFP_ATOMIC); + if (skb) + send_skb_packet(skb, batman_if, dstaddr); + + return; + +out: + spin_unlock_bh(&bat_priv->orig_hash_lock); +} + +/* only send one vis packet. called from send_vis_packets() */ +static void send_vis_packet(struct bat_priv *bat_priv, struct vis_info *info) +{ + struct vis_packet *packet; + + packet = (struct vis_packet *)info->skb_packet->data; + if (packet->ttl < 2) { + pr_debug("Error - can't send vis packet: ttl exceeded\n"); + return; + } + + memcpy(packet->sender_orig, bat_priv->primary_if->net_dev->dev_addr, + ETH_ALEN); + packet->ttl--; + + if (is_broadcast_ether_addr(packet->target_orig)) + broadcast_vis_packet(bat_priv, info); + else + unicast_vis_packet(bat_priv, info); + packet->ttl++; /* restore TTL */ +} + +/* called from timer; send (and maybe generate) vis packet. */ +static void send_vis_packets(struct work_struct *work) +{ + struct delayed_work *delayed_work = + container_of(work, struct delayed_work, work); + struct bat_priv *bat_priv = + container_of(delayed_work, struct bat_priv, vis_work); + struct vis_info *info, *temp; + + spin_lock_bh(&bat_priv->vis_hash_lock); + purge_vis_packets(bat_priv); + + if (generate_vis_packet(bat_priv) == 0) { + /* schedule if generation was successful */ + send_list_add(bat_priv, bat_priv->my_vis_info); + } + + list_for_each_entry_safe(info, temp, &bat_priv->vis_send_list, + send_list) { + + kref_get(&info->refcount); + spin_unlock_bh(&bat_priv->vis_hash_lock); + + if (bat_priv->primary_if) + send_vis_packet(bat_priv, info); + + spin_lock_bh(&bat_priv->vis_hash_lock); + send_list_del(info); + kref_put(&info->refcount, free_info); + } + spin_unlock_bh(&bat_priv->vis_hash_lock); + start_vis_timer(bat_priv); +} + +/* init the vis server. this may only be called when if_list is already + * initialized (e.g. bat0 is initialized, interfaces have been added) */ +int vis_init(struct bat_priv *bat_priv) +{ + struct vis_packet *packet; + int hash_added; + + if (bat_priv->vis_hash) + return 1; + + spin_lock_bh(&bat_priv->vis_hash_lock); + + bat_priv->vis_hash = hash_new(256); + if (!bat_priv->vis_hash) { + pr_err("Can't initialize vis_hash\n"); + goto err; + } + + bat_priv->my_vis_info = kmalloc(MAX_VIS_PACKET_SIZE, GFP_ATOMIC); + if (!bat_priv->my_vis_info) { + pr_err("Can't initialize vis packet\n"); + goto err; + } + + bat_priv->my_vis_info->skb_packet = dev_alloc_skb( + sizeof(struct vis_packet) + + MAX_VIS_PACKET_SIZE + + sizeof(struct ethhdr)); + if (!bat_priv->my_vis_info->skb_packet) + goto free_info; + + skb_reserve(bat_priv->my_vis_info->skb_packet, sizeof(struct ethhdr)); + packet = (struct vis_packet *)skb_put( + bat_priv->my_vis_info->skb_packet, + sizeof(struct vis_packet)); + + /* prefill the vis info */ + bat_priv->my_vis_info->first_seen = jiffies - + msecs_to_jiffies(VIS_INTERVAL); + INIT_LIST_HEAD(&bat_priv->my_vis_info->recv_list); + INIT_LIST_HEAD(&bat_priv->my_vis_info->send_list); + kref_init(&bat_priv->my_vis_info->refcount); + bat_priv->my_vis_info->bat_priv = bat_priv; + packet->version = COMPAT_VERSION; + packet->packet_type = BAT_VIS; + packet->ttl = TTL; + packet->seqno = 0; + packet->entries = 0; + + INIT_LIST_HEAD(&bat_priv->vis_send_list); + + hash_added = hash_add(bat_priv->vis_hash, vis_info_cmp, vis_info_choose, + bat_priv->my_vis_info); + if (hash_added < 0) { + pr_err("Can't add own vis packet into hash\n"); + /* not in hash, need to remove it manually. */ + kref_put(&bat_priv->my_vis_info->refcount, free_info); + goto err; + } + + spin_unlock_bh(&bat_priv->vis_hash_lock); + start_vis_timer(bat_priv); + return 1; + +free_info: + kfree(bat_priv->my_vis_info); + bat_priv->my_vis_info = NULL; +err: + spin_unlock_bh(&bat_priv->vis_hash_lock); + vis_quit(bat_priv); + return 0; +} + +/* Decrease the reference count on a hash item info */ +static void free_info_ref(void *data, void *arg) +{ + struct vis_info *info = data; + + send_list_del(info); + kref_put(&info->refcount, free_info); +} + +/* shutdown vis-server */ +void vis_quit(struct bat_priv *bat_priv) +{ + if (!bat_priv->vis_hash) + return; + + cancel_delayed_work_sync(&bat_priv->vis_work); + + spin_lock_bh(&bat_priv->vis_hash_lock); + /* properly remove, kill timers ... */ + hash_delete(bat_priv->vis_hash, free_info_ref, NULL); + bat_priv->vis_hash = NULL; + bat_priv->my_vis_info = NULL; + spin_unlock_bh(&bat_priv->vis_hash_lock); +} + +/* schedule packets for (re)transmission */ +static void start_vis_timer(struct bat_priv *bat_priv) +{ + INIT_DELAYED_WORK(&bat_priv->vis_work, send_vis_packets); + queue_delayed_work(bat_event_workqueue, &bat_priv->vis_work, + msecs_to_jiffies(VIS_INTERVAL)); +} diff --git a/net/batman-adv/vis.h b/net/batman-adv/vis.h new file mode 100644 index 0000000..2c3b330 --- /dev/null +++ b/net/batman-adv/vis.h @@ -0,0 +1,37 @@ +/* + * Copyright (C) 2008-2010 B.A.T.M.A.N. contributors: + * + * Simon Wunderlich, Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#ifndef _NET_BATMAN_ADV_VIS_H_ +#define _NET_BATMAN_ADV_VIS_H_ + +#define VIS_TIMEOUT 200 /* timeout of vis packets in seconds */ + +int vis_seq_print_text(struct seq_file *seq, void *offset); +void receive_server_sync_packet(struct bat_priv *bat_priv, + struct vis_packet *vis_packet, + int vis_info_len); +void receive_client_update_packet(struct bat_priv *bat_priv, + struct vis_packet *vis_packet, + int vis_info_len); +int vis_init(struct bat_priv *bat_priv); +void vis_quit(struct bat_priv *bat_priv); + +#endif /* _NET_BATMAN_ADV_VIS_H_ */ |