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, 534 insertions, 0 deletions

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;
+}