From: Duan Jiong Date: Fri, 9 May 2014 05:16:48 +0000 (+0800) Subject: neigh: set nud_state to NUD_INCOMPLETE when probing router reachability X-Git-Tag: v3.15-rc7~8^2~42 X-Git-Url: http://git.cascardo.eti.br/?a=commitdiff_plain;h=2176d5d41891753774f648b67470398a5acab584;p=cascardo%2Flinux.git neigh: set nud_state to NUD_INCOMPLETE when probing router reachability Since commit 7e98056964("ipv6: router reachability probing"), a router falls into NUD_FAILED will be probed. Now if function rt6_select() selects a router which neighbour state is NUD_FAILED, and at the same time function rt6_probe() changes the neighbour state to NUD_PROBE, then function dst_neigh_output() can directly send packets, but actually the neighbour still is unreachable. If we set nud_state to NUD_INCOMPLETE instead NUD_PROBE, packets will not be sent out until the neihbour is reachable. In addition, because the route should be probes with a single NS, so we must set neigh->probes to neigh_max_probes(), then the neigh timer timeout and function neigh_timer_handler() will not send other NS Messages. Signed-off-by: Duan Jiong Signed-off-by: David S. Miller --- diff --git a/net/core/neighbour.c b/net/core/neighbour.c index 8f8a96ef9f3f..32d872eec7f5 100644 --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -1248,8 +1248,8 @@ void __neigh_set_probe_once(struct neighbour *neigh) neigh->updated = jiffies; if (!(neigh->nud_state & NUD_FAILED)) return; - neigh->nud_state = NUD_PROBE; - atomic_set(&neigh->probes, NEIGH_VAR(neigh->parms, UCAST_PROBES)); + neigh->nud_state = NUD_INCOMPLETE; + atomic_set(&neigh->probes, neigh_max_probes(neigh)); neigh_add_timer(neigh, jiffies + NEIGH_VAR(neigh->parms, RETRANS_TIME)); }