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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/wan/hdlc_cisco.c | |
download | kernel_samsung_tuna-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_tuna-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_tuna-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/net/wan/hdlc_cisco.c')
-rw-r--r-- | drivers/net/wan/hdlc_cisco.c | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/drivers/net/wan/hdlc_cisco.c b/drivers/net/wan/hdlc_cisco.c new file mode 100644 index 0000000..c1b6896 --- /dev/null +++ b/drivers/net/wan/hdlc_cisco.c @@ -0,0 +1,330 @@ +/* + * Generic HDLC support routines for Linux + * Cisco HDLC support + * + * Copyright (C) 2000 - 2003 Krzysztof Halasa <khc@pm.waw.pl> + * + * 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. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/poll.h> +#include <linux/errno.h> +#include <linux/if_arp.h> +#include <linux/init.h> +#include <linux/skbuff.h> +#include <linux/pkt_sched.h> +#include <linux/inetdevice.h> +#include <linux/lapb.h> +#include <linux/rtnetlink.h> +#include <linux/hdlc.h> + +#undef DEBUG_HARD_HEADER + +#define CISCO_MULTICAST 0x8F /* Cisco multicast address */ +#define CISCO_UNICAST 0x0F /* Cisco unicast address */ +#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ +#define CISCO_SYS_INFO 0x2000 /* Cisco interface/system info */ +#define CISCO_ADDR_REQ 0 /* Cisco address request */ +#define CISCO_ADDR_REPLY 1 /* Cisco address reply */ +#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ + + +static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev, + u16 type, void *daddr, void *saddr, + unsigned int len) +{ + hdlc_header *data; +#ifdef DEBUG_HARD_HEADER + printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name); +#endif + + skb_push(skb, sizeof(hdlc_header)); + data = (hdlc_header*)skb->data; + if (type == CISCO_KEEPALIVE) + data->address = CISCO_MULTICAST; + else + data->address = CISCO_UNICAST; + data->control = 0; + data->protocol = htons(type); + + return sizeof(hdlc_header); +} + + + +static void cisco_keepalive_send(struct net_device *dev, u32 type, + u32 par1, u32 par2) +{ + struct sk_buff *skb; + cisco_packet *data; + + skb = dev_alloc_skb(sizeof(hdlc_header) + sizeof(cisco_packet)); + if (!skb) { + printk(KERN_WARNING + "%s: Memory squeeze on cisco_keepalive_send()\n", + dev->name); + return; + } + skb_reserve(skb, 4); + cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0); + data = (cisco_packet*)skb->tail; + + data->type = htonl(type); + data->par1 = htonl(par1); + data->par2 = htonl(par2); + data->rel = 0xFFFF; + /* we will need do_div here if 1000 % HZ != 0 */ + data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ)); + + skb_put(skb, sizeof(cisco_packet)); + skb->priority = TC_PRIO_CONTROL; + skb->dev = dev; + skb->nh.raw = skb->data; + + dev_queue_xmit(skb); +} + + + +static unsigned short cisco_type_trans(struct sk_buff *skb, + struct net_device *dev) +{ + hdlc_header *data = (hdlc_header*)skb->data; + + if (skb->len < sizeof(hdlc_header)) + return __constant_htons(ETH_P_HDLC); + + if (data->address != CISCO_MULTICAST && + data->address != CISCO_UNICAST) + return __constant_htons(ETH_P_HDLC); + + switch(data->protocol) { + case __constant_htons(ETH_P_IP): + case __constant_htons(ETH_P_IPX): + case __constant_htons(ETH_P_IPV6): + skb_pull(skb, sizeof(hdlc_header)); + return data->protocol; + default: + return __constant_htons(ETH_P_HDLC); + } +} + + +static int cisco_rx(struct sk_buff *skb) +{ + struct net_device *dev = skb->dev; + hdlc_device *hdlc = dev_to_hdlc(dev); + hdlc_header *data = (hdlc_header*)skb->data; + cisco_packet *cisco_data; + struct in_device *in_dev; + u32 addr, mask; + + if (skb->len < sizeof(hdlc_header)) + goto rx_error; + + if (data->address != CISCO_MULTICAST && + data->address != CISCO_UNICAST) + goto rx_error; + + switch(ntohs(data->protocol)) { + case CISCO_SYS_INFO: + /* Packet is not needed, drop it. */ + dev_kfree_skb_any(skb); + return NET_RX_SUCCESS; + + case CISCO_KEEPALIVE: + if (skb->len != sizeof(hdlc_header) + CISCO_PACKET_LEN && + skb->len != sizeof(hdlc_header) + CISCO_BIG_PACKET_LEN) { + printk(KERN_INFO "%s: Invalid length of Cisco " + "control packet (%d bytes)\n", + dev->name, skb->len); + goto rx_error; + } + + cisco_data = (cisco_packet*)(skb->data + sizeof(hdlc_header)); + + switch(ntohl (cisco_data->type)) { + case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */ + in_dev = dev->ip_ptr; + addr = 0; + mask = ~0; /* is the mask correct? */ + + if (in_dev != NULL) { + struct in_ifaddr **ifap = &in_dev->ifa_list; + + while (*ifap != NULL) { + if (strcmp(dev->name, + (*ifap)->ifa_label) == 0) { + addr = (*ifap)->ifa_local; + mask = (*ifap)->ifa_mask; + break; + } + ifap = &(*ifap)->ifa_next; + } + + cisco_keepalive_send(dev, CISCO_ADDR_REPLY, + addr, mask); + } + dev_kfree_skb_any(skb); + return NET_RX_SUCCESS; + + case CISCO_ADDR_REPLY: + printk(KERN_INFO "%s: Unexpected Cisco IP address " + "reply\n", dev->name); + goto rx_error; + + case CISCO_KEEPALIVE_REQ: + hdlc->state.cisco.rxseq = ntohl(cisco_data->par1); + if (hdlc->state.cisco.request_sent && + ntohl(cisco_data->par2)==hdlc->state.cisco.txseq) { + hdlc->state.cisco.last_poll = jiffies; + if (!hdlc->state.cisco.up) { + u32 sec, min, hrs, days; + sec = ntohl(cisco_data->time) / 1000; + min = sec / 60; sec -= min * 60; + hrs = min / 60; min -= hrs * 60; + days = hrs / 24; hrs -= days * 24; + printk(KERN_INFO "%s: Link up (peer " + "uptime %ud%uh%um%us)\n", + dev->name, days, hrs, + min, sec); + netif_carrier_on(dev); + hdlc->state.cisco.up = 1; + } + } + + dev_kfree_skb_any(skb); + return NET_RX_SUCCESS; + } /* switch(keepalive type) */ + } /* switch(protocol) */ + + printk(KERN_INFO "%s: Unsupported protocol %x\n", dev->name, + data->protocol); + dev_kfree_skb_any(skb); + return NET_RX_DROP; + + rx_error: + hdlc->stats.rx_errors++; /* Mark error */ + dev_kfree_skb_any(skb); + return NET_RX_DROP; +} + + + +static void cisco_timer(unsigned long arg) +{ + struct net_device *dev = (struct net_device *)arg; + hdlc_device *hdlc = dev_to_hdlc(dev); + + if (hdlc->state.cisco.up && + time_after(jiffies, hdlc->state.cisco.last_poll + + hdlc->state.cisco.settings.timeout * HZ)) { + hdlc->state.cisco.up = 0; + printk(KERN_INFO "%s: Link down\n", dev->name); + netif_carrier_off(dev); + } + + cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ, + ++hdlc->state.cisco.txseq, + hdlc->state.cisco.rxseq); + hdlc->state.cisco.request_sent = 1; + hdlc->state.cisco.timer.expires = jiffies + + hdlc->state.cisco.settings.interval * HZ; + hdlc->state.cisco.timer.function = cisco_timer; + hdlc->state.cisco.timer.data = arg; + add_timer(&hdlc->state.cisco.timer); +} + + + +static void cisco_start(struct net_device *dev) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + hdlc->state.cisco.up = 0; + hdlc->state.cisco.request_sent = 0; + hdlc->state.cisco.txseq = hdlc->state.cisco.rxseq = 0; + + init_timer(&hdlc->state.cisco.timer); + hdlc->state.cisco.timer.expires = jiffies + HZ; /*First poll after 1s*/ + hdlc->state.cisco.timer.function = cisco_timer; + hdlc->state.cisco.timer.data = (unsigned long)dev; + add_timer(&hdlc->state.cisco.timer); +} + + + +static void cisco_stop(struct net_device *dev) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + del_timer_sync(&hdlc->state.cisco.timer); + if (netif_carrier_ok(dev)) + netif_carrier_off(dev); + hdlc->state.cisco.up = 0; + hdlc->state.cisco.request_sent = 0; +} + + + +int hdlc_cisco_ioctl(struct net_device *dev, struct ifreq *ifr) +{ + cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco; + const size_t size = sizeof(cisco_proto); + cisco_proto new_settings; + hdlc_device *hdlc = dev_to_hdlc(dev); + int result; + + switch (ifr->ifr_settings.type) { + case IF_GET_PROTO: + ifr->ifr_settings.type = IF_PROTO_CISCO; + if (ifr->ifr_settings.size < size) { + ifr->ifr_settings.size = size; /* data size wanted */ + return -ENOBUFS; + } + if (copy_to_user(cisco_s, &hdlc->state.cisco.settings, size)) + return -EFAULT; + return 0; + + case IF_PROTO_CISCO: + if(!capable(CAP_NET_ADMIN)) + return -EPERM; + + if(dev->flags & IFF_UP) + return -EBUSY; + + if (copy_from_user(&new_settings, cisco_s, size)) + return -EFAULT; + + if (new_settings.interval < 1 || + new_settings.timeout < 2) + return -EINVAL; + + result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); + + if (result) + return result; + + hdlc_proto_detach(hdlc); + memcpy(&hdlc->state.cisco.settings, &new_settings, size); + memset(&hdlc->proto, 0, sizeof(hdlc->proto)); + + hdlc->proto.start = cisco_start; + hdlc->proto.stop = cisco_stop; + hdlc->proto.netif_rx = cisco_rx; + hdlc->proto.type_trans = cisco_type_trans; + hdlc->proto.id = IF_PROTO_CISCO; + dev->hard_start_xmit = hdlc->xmit; + dev->hard_header = cisco_hard_header; + dev->hard_header_cache = NULL; + dev->type = ARPHRD_CISCO; + dev->flags = IFF_POINTOPOINT | IFF_NOARP; + dev->addr_len = 0; + return 0; + } + + return -EINVAL; +} |