Merge tag 'batman-adv-for-davem' of git://git.open-mesh.org/linux-merge

Included changes:

* an improvement to avoid to linearise the whole received packet when not needed
* an improvement for client traffic rerouting after roaming
* a fix for the local translation table state-machine
* minor cleanups and fixes

Documentation/networking/batman-adv.txt

-[state: 21-08-2011]
-
 BATMAN-ADV
 ----------
 
@@ -68,10 +66,11 @@ All  mesh  wide  settings  can be found in batman's own interface
 folder:
 
 # ls /sys/class/net/bat0/mesh/
-# aggregated_ogms        fragmentation          hop_penalty
-# ap_isolation           gw_bandwidth           log_level
-# bonding                gw_mode                orig_interval
-# bridge_loop_avoidance  gw_sel_class           vis_mode
+# aggregated_ogms        gw_bandwidth           log_level
+# ap_isolation           gw_mode                orig_interval
+# bonding                gw_sel_class           routing_algo
+# bridge_loop_avoidance  hop_penalty            vis_mode
+# fragmentation
 
 
 There is a special folder for debugging information:

net/batman-adv/bat_iv_ogm.c

@@ -43,7 +43,6 @@ static struct neigh_node *bat_iv_ogm_neigh_new(struct hard_iface *hard_iface,
 		goto out;
 
 	INIT_LIST_HEAD(&neigh_node->bonding_list);
-	spin_lock_init(&neigh_node->tq_lock);
 
 	neigh_node->orig_node = orig_neigh;
 	neigh_node->if_incoming = hard_iface;
@@ -637,12 +636,12 @@ static void bat_iv_ogm_orig_update(struct bat_priv *bat_priv,
 		if (is_duplicate)
 			continue;
 
-		spin_lock_bh(&tmp_neigh_node->tq_lock);
+		spin_lock_bh(&tmp_neigh_node->lq_update_lock);
 		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);
-		spin_unlock_bh(&tmp_neigh_node->tq_lock);
+		spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
 	}
 
 	if (!neigh_node) {
@@ -668,12 +667,12 @@ static void bat_iv_ogm_orig_update(struct bat_priv *bat_priv,
 	orig_node->flags = batman_ogm_packet->flags;
 	neigh_node->last_seen = jiffies;
 
-	spin_lock_bh(&neigh_node->tq_lock);
+	spin_lock_bh(&neigh_node->lq_update_lock);
 	ring_buffer_set(neigh_node->tq_recv,
 			&neigh_node->tq_index,
 			batman_ogm_packet->tq);
 	neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
-	spin_unlock_bh(&neigh_node->tq_lock);
+	spin_unlock_bh(&neigh_node->lq_update_lock);
 
 	if (!is_duplicate) {
 		orig_node->last_ttl = batman_ogm_packet->header.ttl;

net/batman-adv/hard-interface.c

@@ -173,9 +173,9 @@ static void check_known_mac_addr(const struct net_device *net_dev)
 				 net_dev->dev_addr))
 			continue;
 
-		pr_warning("The newly added mac address (%pM) already exists on: %s\n",
-			   net_dev->dev_addr, hard_iface->net_dev->name);
-		pr_warning("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
+		pr_warn("The newly added mac address (%pM) already exists on: %s\n",
+			net_dev->dev_addr, hard_iface->net_dev->name);
+		pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
 	}
 	rcu_read_unlock();
 }

net/batman-adv/main.h

@@ -28,7 +28,7 @@
 #define DRIVER_DEVICE "batman-adv"
 
 #ifndef SOURCE_VERSION
-#define SOURCE_VERSION "2012.1.0"
+#define SOURCE_VERSION "2012.2.0"
 #endif
 
 /* B.A.T.M.A.N. parameters */

net/batman-adv/originator.c

@@ -99,6 +99,7 @@ struct neigh_node *batadv_neigh_node_new(struct hard_iface *hard_iface,
 	INIT_HLIST_NODE(&neigh_node->list);
 
 	memcpy(neigh_node->addr, neigh_addr, ETH_ALEN);
+	spin_lock_init(&neigh_node->lq_update_lock);
 
 	/* extra reference for return */
 	atomic_set(&neigh_node->refcount, 2);

net/batman-adv/routing.c

@@ -234,17 +234,14 @@ int window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff,
 {
 	if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) ||
 	    (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
-		if (has_timed_out(*last_reset, RESET_PROTECTION_MS)) {
-
-			*last_reset = jiffies;
-			bat_dbg(DBG_BATMAN, bat_priv,
-				"old packet received, start protection\n");
-
-			return 0;
-		} else {
+		if (!has_timed_out(*last_reset, RESET_PROTECTION_MS))
 			return 1;
-		}
+
+		*last_reset = jiffies;
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"old packet received, start protection\n");
 	}
+
 	return 0;
 }
 
@@ -916,12 +913,20 @@ static int check_unicast_ttvn(struct bat_priv *bat_priv,
 
 	/* Check whether I have to reroute the packet */
 	if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) {
-		/* Linearize the skb before accessing it */
-		if (skb_linearize(skb) < 0)
+		/* check if there is enough data before accessing it */
+		if (pskb_may_pull(skb, sizeof(struct unicast_packet) +
+				  ETH_HLEN) < 0)
 			return 0;
 
 		ethhdr = (struct ethhdr *)(skb->data +
 			sizeof(struct unicast_packet));
+
+		/* we don't have an updated route for this client, so we should
+		 * not try to reroute the packet!!
+		 */
+		if (tt_global_client_is_roaming(bat_priv, ethhdr->h_dest))
+			return 1;
+
 		orig_node = transtable_search(bat_priv, NULL, ethhdr->h_dest);
 
 		if (!orig_node) {

net/batman-adv/send.c

@@ -45,8 +45,8 @@ int send_skb_packet(struct sk_buff *skb, struct hard_iface *hard_iface,
 		goto send_skb_err;
 
 	if (!(hard_iface->net_dev->flags & IFF_UP)) {
-		pr_warning("Interface %s is not up - can't send packet via that interface!\n",
-			   hard_iface->net_dev->name);
+		pr_warn("Interface %s is not up - can't send packet via that interface!\n",
+			hard_iface->net_dev->name);
 		goto send_skb_err;
 	}
 

net/batman-adv/translation-table.c

@@ -206,6 +206,8 @@ void tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 
 	if (tt_local_entry) {
 		tt_local_entry->last_seen = jiffies;
+		/* possibly unset the TT_CLIENT_PENDING flag */
+		tt_local_entry->common.flags &= ~TT_CLIENT_PENDING;
 		goto out;
 	}
 
@@ -2117,3 +2119,22 @@ void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
 		}
 	}
 }
+
+/* returns true whether we know that the client has moved from its old
+ * originator to another one. This entry is kept is still kept for consistency
+ * purposes
+ */
+bool tt_global_client_is_roaming(struct bat_priv *bat_priv, uint8_t *addr)
+{
+	struct tt_global_entry *tt_global_entry;
+	bool ret = false;
+
+	tt_global_entry = tt_global_hash_find(bat_priv, addr);
+	if (!tt_global_entry)
+		goto out;
+
+	ret = tt_global_entry->common.flags & TT_CLIENT_ROAM;
+	tt_global_entry_free_ref(tt_global_entry);
+out:
+	return ret;
+}

net/batman-adv/translation-table.h

@@ -53,5 +53,7 @@ bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst);
 void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
 		    const unsigned char *tt_buff, uint8_t tt_num_changes,
 		    uint8_t ttvn, uint16_t tt_crc);
+bool tt_global_client_is_roaming(struct bat_priv *bat_priv, uint8_t *addr);
+
 
 #endif /* _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ */

net/batman-adv/types.h

@@ -137,7 +137,7 @@ struct neigh_node {
 	struct rcu_head rcu;
 	struct orig_node *orig_node;
 	struct hard_iface *if_incoming;
-	spinlock_t tq_lock;	/* protects: tq_recv, tq_index */
+	spinlock_t lq_update_lock;	/* protects: tq_recv, tq_index */
 };
 
 #ifdef CONFIG_BATMAN_ADV_BLA

net/batman-adv/unicast.c

@@ -331,6 +331,14 @@ int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
 	unicast_packet->ttvn =
 		(uint8_t)atomic_read(&orig_node->last_ttvn);
 
+	/* inform the destination node that we are still missing a correct route
+	 * for this client. The destination will receive this packet and will
+	 * try to reroute it because the ttvn contained in the header is less
+	 * than the current one
+	 */
+	if (tt_global_client_is_roaming(bat_priv, ethhdr->h_dest))
+		unicast_packet->ttvn = unicast_packet->ttvn - 1;
+
 	if (atomic_read(&bat_priv->fragmentation) &&
 	    data_len + sizeof(*unicast_packet) >
 				neigh_node->if_incoming->net_dev->mtu) {