From: Ville Nuorvala Date: Fri, 22 Sep 2006 21:42:46 +0000 (-0700) Subject: [IPV6] NDISC: Avoid updating neighbor cache for proxied address in receiving NA. X-Git-Tag: v2.6.19-rc1~1272^2~6 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=5f3e6e9e19f50a6910aec2dbd479187aabba04b7;p=linux-2.6-block.git [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 --- diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index ed01f9a330d6..0e0d6ce69021 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|