From 5f3e6e9e19f50a6910aec2dbd479187aabba04b7 Mon Sep 17 00:00:00 2001 From: Ville Nuorvala Date: Fri, 22 Sep 2006 14:42:46 -0700 Subject: [PATCH] [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 Signed-off-by: Masahide NAKAMURA Signed-off-by: YOSHIFUJI Hideaki --- net/ipv6/ndisc.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index ed01f9a..0e0d6ce 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| -- 2.7.4