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authorVille Nuorvala <vnuorval@tcs.hut.fi>2006-09-22 14:42:46 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-09-22 15:20:23 -0700
commit5f3e6e9e19f50a6910aec2dbd479187aabba04b7 (patch)
tree872c70c3012701ebae6d7f1861894f9d0e634817 /net/ipv6
parent74553b09dcd9194cbda737016f0b89f245145670 (diff)
[IPV6] NDISC: Avoid updating neighbor cache for proxied address in receiving NA.
This aims at proxying router not updating neighbor cache entry for proxied address when it receives NA because either the proxied node is off link or it has already sent a NA to the proxied router. Based on MIPL2 kernel patch. Signed-off-by: Ville Nuorvala <vnuorval@tcs.hut.fi> Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/ndisc.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index ed01f9a330d..0e0d6ce6902 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -952,6 +952,15 @@ static void ndisc_recv_na(struct sk_buff *skb)
if (neigh->nud_state & NUD_FAILED)
goto out;
+ /*
+ * Don't update the neighbor cache entry on a proxy NA from
+ * ourselves because either the proxied node is off link or it
+ * has already sent a NA to us.
+ */
+ if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
+ pneigh_lookup(&nd_tbl, &msg->target, dev, 0))
+ goto out;
+
neigh_update(neigh, lladdr,
msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
NEIGH_UPDATE_F_WEAK_OVERRIDE|