pull request: batman-adv 2012-09-25

Hello David,

here are two fixes (the last set) we would to propose for net/linux-3.6.

The one from Def fixes a wrong behaviour of batman-adv in case of virtual
interface mac address change, while the other from Linüs fixes a problem in the
route selection which can lead to a continuous route flapping under certain
conditions.

We would also like to enqueue both patches for sending to stable-3.5.

During merge with net/master you will hit a conflict. I'm going to send some
instructions on how to solve it.

Thank you very much,
		Antonio



The following changes since commit 2b018d57ff18e5405823e5cb59651a5b4d946d7b:

  pppoe: drop PPPOX_ZOMBIEs in pppoe_release (2012-09-22 15:49:31 -0400)

are available in the git repository at:

  git://git.open-mesh.org/linux-merge.git tags/batman-adv-fix-for-davem

for you to fetch changes up to 7caf69fb9c5017df01945a1861c042f6aa08edeb:

  batman-adv: Fix symmetry check / route flapping in multi interface setups (2012-09-23 23:12:49 +0200)

----------------------------------------------------------------
Included fixes:
- fix the behaviour of batman-adv in case of virtual interface MAC change event
- fix symmetric link check in neighbour selection

----------------------------------------------------------------
Def (1):
      batman-adv: Fix change mac address of soft iface.

Linus Lüssing (1):
      batman-adv: Fix symmetry check / route flapping in multi interface setups

 net/batman-adv/bat_iv_ogm.c     | 13 +++++++------
 net/batman-adv/soft-interface.c |  7 +++++--
 2 files changed, 12 insertions(+), 8 deletions(-)

From: Linus Lüssing <redacted>

If receiving an OGM from a neighbor other than the currently selected
and if it has the same TQ then we are supposed to switch if this
neighbor provides a more symmetric link than the currently selected one.

However this symmetry check currently is broken if the interface of the
neighbor we received the OGM from and the one of the currently selected
neighbor differ: We are currently trying to determine the symmetry of the
link towards the selected router via the link we received the OGM from
instead of just checking via the link towards the currently selected
router.

This leads to way more route switches than necessary and can lead to
permanent route flapping in many common multi interface setups.

This patch fixes this issue by using the right interface for this
symmetry check.

Signed-off-by: Linus Lüssing <redacted>
Signed-off-by: Antonio Quartulli <redacted>
---
 net/batman-adv/bat_iv_ogm.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index e877af8..469daab 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c

@@ -642,7 +642,8 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 	struct batadv_neigh_node *router = NULL;
 	struct batadv_orig_node *orig_node_tmp;
 	struct hlist_node *node;
-	uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
+	int if_num;
+	uint8_t sum_orig, sum_neigh;
 	uint8_t *neigh_addr;
 
 	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,

@@ -727,17 +728,17 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 	if (router && (neigh_node->tq_avg == router->tq_avg)) {
 		orig_node_tmp = router->orig_node;
 		spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
-		bcast_own_sum_orig =
-			orig_node_tmp->bcast_own_sum[if_incoming->if_num];
+		if_num = router->if_incoming->if_num;
+		sum_orig = orig_node_tmp->bcast_own_sum[if_num];
 		spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 
 		orig_node_tmp = neigh_node->orig_node;
 		spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
-		bcast_own_sum_neigh =
-			orig_node_tmp->bcast_own_sum[if_incoming->if_num];
+		if_num = neigh_node->if_incoming->if_num;
+		sum_neigh = orig_node_tmp->bcast_own_sum[if_num];
 		spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 
-		if (bcast_own_sum_orig >= bcast_own_sum_neigh)
+		if (sum_orig >= sum_neigh)
 			goto update_tt;
 	}
 

-- 
1.7.12