neigh: set nud_state to NUD_INCOMPLETE when probing router reachability
[ Upstream commit 2176d5d418
]
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 <duanj.fnst@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
a3db451d65
commit
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@ -1247,8 +1247,8 @@ void __neigh_set_probe_once(struct neighbour *neigh)
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neigh->updated = jiffies;
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if (!(neigh->nud_state & NUD_FAILED))
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return;
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neigh->nud_state = NUD_PROBE;
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atomic_set(&neigh->probes, NEIGH_VAR(neigh->parms, UCAST_PROBES));
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neigh->nud_state = NUD_INCOMPLETE;
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atomic_set(&neigh->probes, neigh_max_probes(neigh));
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neigh_add_timer(neigh,
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jiffies + NEIGH_VAR(neigh->parms, RETRANS_TIME));
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}
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