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authorHe Chunhui <hchunhui@mail.ustc.edu.cn>2016-07-26 09:16:52 +0300
committerDavid S. Miller <davem@davemloft.net>2016-07-27 00:25:20 +0300
commitd1c2b5010d07e967d7cbcc232a86b2308d824ca3 (patch)
tree9deefa7e8dcb6a4756e6c7faadb0ca2ab1128e1a /net
parentee591f46a5a0ca0caaeb72b79ec5e012c6e3c9ef (diff)
downloadlinux-d1c2b5010d07e967d7cbcc232a86b2308d824ca3.tar.xz
net: neigh: disallow transition to NUD_STALE if lladdr is unchanged in neigh_update()
NUD_STALE is used when the caller(e.g. arp_process()) can't guarantee neighbour reachability. If the entry was NUD_VALID and lladdr is unchanged, the entry state should not be changed. Currently the code puts an extra "NUD_CONNECTED" condition. So if old state was NUD_DELAY or NUD_PROBE (they are NUD_VALID but not NUD_CONNECTED), the state can be changed to NUD_STALE. This may cause problem. Because NUD_STALE lladdr doesn't guarantee reachability, when we send traffic, the state will be changed to NUD_DELAY. In normal case, if we get no confirmation (by dst_confirm()), we will change the state to NUD_PROBE and send probe traffic. But now the state may be reset to NUD_STALE again(e.g. by broadcast ARP packets), so the probe traffic will not be sent. This situation may happen again and again, and packets will be sent to an non-reachable lladdr forever. The fix is to remove the "NUD_CONNECTED" condition. After that the "NEIGH_UPDATE_F_WEAK_OVERRIDE" condition (used by IPv6) in that branch will be redundant, so remove it. This change may increase probe traffic, but it's essential since NUD_STALE lladdr is unreliable. To ensure correctness, we prefer to resolve lladdr, when we can't get confirmation, even while remote packets try to set NUD_STALE state. Signed-off-by: Chunhui He <hchunhui@mail.ustc.edu.cn> Signed-off-by: Julian Anastasov <ja@ssi.bg> Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/neighbour.c7
1 files changed, 1 insertions, 6 deletions
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 5cdc62a8eb84..cf26e04c4046 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1060,8 +1060,6 @@ static void neigh_update_hhs(struct neighbour *neigh)
NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected"
lladdr instead of overriding it
if it is different.
- It also allows to retain current state
- if lladdr is unchanged.
NEIGH_UPDATE_F_ADMIN means that the change is administrative.
NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing
@@ -1150,10 +1148,7 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
} else
goto out;
} else {
- if (lladdr == neigh->ha && new == NUD_STALE &&
- ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) ||
- (old & NUD_CONNECTED))
- )
+ if (lladdr == neigh->ha && new == NUD_STALE)
new = old;
}
}