From 9f56220fad0d13f8b0ebe7592f41fdb49874d143 Mon Sep 17 00:00:00 2001 From: Andreas Hofmeister Date: Mon, 24 Oct 2011 19:13:15 -0400 Subject: [PATCH] ipv6: Do not use routes from locally generated RAs When hybrid mode is enabled (accept_ra == 2), the kernel also sees RAs generated locally. This is useful since it allows the kernel to auto-configure its own interface addresses. However, if 'accept_ra_defrtr' and/or 'accept_ra_rtr_pref' are set and the locally generated RAs announce the default route and/or other route information, the kernel happily inserts bogus routes with its own address as gateway. With this patch, adding routes from an RA will be skiped when the RAs source address matches any local address, just as if 'accept_ra_defrtr' and 'accept_ra_rtr_pref' were set to 0. Signed-off-by: Andreas Hofmeister Signed-off-by: David S. Miller --- net/ipv6/ndisc.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 7968bfec6138..44e5b7f2a6c1 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1221,6 +1221,9 @@ static void ndisc_router_discovery(struct sk_buff *skb) if (!in6_dev->cnf.accept_ra_defrtr) goto skip_defrtr; + if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) + goto skip_defrtr; + lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); #ifdef CONFIG_IPV6_ROUTER_PREF @@ -1343,6 +1346,9 @@ static void ndisc_router_discovery(struct sk_buff *skb) goto out; #ifdef CONFIG_IPV6_ROUTE_INFO + if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) + goto skip_routeinfo; + if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { struct nd_opt_hdr *p; for (p = ndopts.nd_opts_ri; @@ -1360,6 +1366,8 @@ static void ndisc_router_discovery(struct sk_buff *skb) &ipv6_hdr(skb)->saddr); } } + +skip_routeinfo: #endif #ifdef CONFIG_IPV6_NDISC_NODETYPE