net: Add batman-adv meshing protocol

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.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 564 insertions, 0 deletions

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;
+}