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>
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;
+}