[linux-next] LinuxNextTracking branch, master, updated. next-20131029

batman at open-mesh.org batman at open-mesh.org
Wed Oct 30 00:18:26 CET 2013


The following commit has been merged in the master branch:
commit 3c4f7ab60cc21e8fc65b234f3a6174fc19a93fee
Author: Antonio Quartulli <antonio at open-mesh.com>
Date:   Sun Oct 13 02:50:19 2013 +0200

    batman-adv: improve the TT component to support runtime flag changes
    
    Some flags (i.e. the WIFI flag) may change after that the
    related client has already been announced. However it is
    useful to informa the rest of the network about this change.
    
    Add a runtime-flag-switch detection mechanism and
    re-announce the related TT entry to advertise the new flag
    value.
    
    This mechanism can be easily exploited by future flags that
    may need the same treatment.
    
    Signed-off-by: Antonio Quartulli <antonio at open-mesh.com>
    Signed-off-by: Marek Lindner <mareklindner at neomailbox.ch>

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index b0fe177..267780f 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -358,6 +358,13 @@ static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 			goto del;
 		if (del_op_requested && !del_op_entry)
 			goto del;
+
+		/* this is a second add in the same originator interval. It
+		 * means that flags have been changed: update them!
+		 */
+		if (!del_op_requested && !del_op_entry)
+			entry->change.flags = flags;
+
 		continue;
 del:
 		list_del(&entry->list);
@@ -482,6 +489,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 	struct batadv_tt_orig_list_entry *orig_entry;
 	int hash_added, table_size, packet_size_max;
 	bool ret = false, roamed_back = false;
+	uint8_t remote_flags;
 
 	if (ifindex != BATADV_NULL_IFINDEX)
 		in_dev = dev_get_by_index(&init_net, ifindex);
@@ -596,8 +604,23 @@ check_roaming:
 		}
 	}
 
-	ret = true;
+	/* store the current remote flags before altering them. This helps
+	 * understanding is flags are changing or not
+	 */
+	remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
+
+	if (batadv_is_wifi_netdev(in_dev))
+		tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
+	else
+		tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 
+	/* if any "dynamic" flag has been modified, resend an ADD event for this
+	 * entry so that all the nodes can get the new flags
+	 */
+	if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
+		batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
+
+	ret = true;
 out:
 	if (in_dev)
 		dev_put(in_dev);
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 04b6b0b..61297b6 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -36,6 +36,12 @@
 #endif /* CONFIG_BATMAN_ADV_DAT */
 
 /**
+ * BATADV_TT_REMOTE_MASK - bitmask selecting the flags that are sent over the
+ *  wire only
+ */
+#define BATADV_TT_REMOTE_MASK	0x00FF
+
+/**
  * struct batadv_hard_iface_bat_iv - per hard interface B.A.T.M.A.N. IV data
  * @ogm_buff: buffer holding the OGM packet
  * @ogm_buff_len: length of the OGM packet buffer

-- 
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