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[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>
This commit is contained in:
Ville Nuorvala 2006-09-22 14:42:46 -07:00 committed by David S. Miller
parent 74553b09dc
commit 5f3e6e9e19
1 changed files with 9 additions and 0 deletions
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9
net/ipv6/ndisc.c
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@ -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|