[PATCH] mac80211: don't invalidate SN on discovery failure

[PATCH] mac80211: don't invalidate SN on discovery failure

[Alexis Green]

From: Jesse Jones <jjones@cococorp.com>

The 2012 spec mentions that path SNs can be invalid when created (see
section 13.10.8.4 table 13-9) but AFAICT never talks about invalidating
SNs. Which makes sense: if we have figured out the path to a target at a
certain SN then we want to remember that fact. Failing to do so can lead
to routing loops because if we don't have a valid SN then we have no way
of knowing whether an incoming path message leads to or away from the
target.

However currently when discovery fails we zero out mpath->flags which
clears MESH_PATH_SN_VALID. This patch fixes that so that only the
discovery relevant flags are cleared.

Signed-off-by: Alexis Green <agreen@cococorp.com>

---

diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
index 085edc1..1d849be
--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -1176,7 +1176,8 @@ void mesh_path_timer(unsigned long data)
 		spin_unlock_bh(&mpath->state_lock);
 		mesh_queue_preq(mpath, 0);
 	} else {
-		mpath->flags = 0;
+		mpath->flags &= ~(MESH_PATH_RESOLVING |
+			MESH_PATH_RESOLVED | MESH_PATH_REQ_QUEUED);
 		mpath->exp_time = jiffies;
 		spin_unlock_bh(&mpath->state_lock);
 		if (!mpath->is_gate && mesh_gate_num(sdata) > 0) {

Re: [PATCH] mac80211: don't invalidate SN on discovery failure

[Johannes Berg]

On Fri, 2015-06-12 at 14:13 -0700, Alexis Green wrote:
> From: Jesse Jones <jjones@cococorp.com>
> 
> The 2012 spec mentions that path SNs can be invalid when created (see
> section 13.10.8.4 table 13-9) but AFAICT never talks about invalidating
> SNs. Which makes sense: if we have figured out the path to a target at a
> certain SN then we want to remember that fact. Failing to do so can lead
> to routing loops because if we don't have a valid SN then we have no way
> of knowing whether an incoming path message leads to or away from the
> target.
> 
> However currently when discovery fails we zero out mpath->flags which
> clears MESH_PATH_SN_VALID. This patch fixes that so that only the
> discovery relevant flags are cleared.

Applied; I fixed the indentation a bit.

Also, please mention "mesh" in the future in the subject of your
patches, it makes it easier to pick out.

johannes