Commit 5f3e6e9e authored Sep 22, 2006 by Ville Nuorvala Committed by David S. Miller Sep 22, 2006

[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>

parent 74553b09

net/ipv6/ndisc.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -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\|