From e56f322cd33a8ed0ef7ce0c93bc100087d9c8a7f Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 22 Dec 2011 04:15:53 +0000 Subject: net: introduce DST_NOPEER dst flag [ Upstream commit e688a604807647c9450f9c12a7cb6d027150a895 ] Chris Boot reported crashes occurring in ipv6_select_ident(). [ 461.457562] RIP: 0010:[] [] ipv6_select_ident+0x31/0xa7 [ 461.578229] Call Trace: [ 461.580742] [ 461.582870] [] ? udp6_ufo_fragment+0x124/0x1a2 [ 461.589054] [] ? ipv6_gso_segment+0xc0/0x155 [ 461.595140] [] ? skb_gso_segment+0x208/0x28b [ 461.601198] [] ? ipv6_confirm+0x146/0x15e [nf_conntrack_ipv6] [ 461.608786] [] ? nf_iterate+0x41/0x77 [ 461.614227] [] ? dev_hard_start_xmit+0x357/0x543 [ 461.620659] [] ? nf_hook_slow+0x73/0x111 [ 461.626440] [] ? br_parse_ip_options+0x19a/0x19a [bridge] [ 461.633581] [] ? dev_queue_xmit+0x3af/0x459 [ 461.639577] [] ? br_dev_queue_push_xmit+0x72/0x76 [bridge] [ 461.646887] [] ? br_nf_post_routing+0x17d/0x18f [bridge] [ 461.653997] [] ? nf_iterate+0x41/0x77 [ 461.659473] [] ? br_flood+0xfa/0xfa [bridge] [ 461.665485] [] ? nf_hook_slow+0x73/0x111 [ 461.671234] [] ? br_flood+0xfa/0xfa [bridge] [ 461.677299] [] ? nf_bridge_update_protocol+0x20/0x20 [bridge] [ 461.684891] [] ? nf_ct_zone+0xa/0x17 [nf_conntrack] [ 461.691520] [] ? br_flood+0xfa/0xfa [bridge] [ 461.697572] [] ? NF_HOOK.constprop.8+0x3c/0x56 [bridge] [ 461.704616] [] ? nf_bridge_push_encap_header+0x1c/0x26 [bridge] [ 461.712329] [] ? br_nf_forward_finish+0x8a/0x95 [bridge] [ 461.719490] [] ? nf_bridge_pull_encap_header+0x1c/0x27 [bridge] [ 461.727223] [] ? br_nf_forward_ip+0x1c0/0x1d4 [bridge] [ 461.734292] [] ? nf_iterate+0x41/0x77 [ 461.739758] [] ? __br_deliver+0xa0/0xa0 [bridge] [ 461.746203] [] ? nf_hook_slow+0x73/0x111 [ 461.751950] [] ? __br_deliver+0xa0/0xa0 [bridge] [ 461.758378] [] ? NF_HOOK.constprop.4+0x56/0x56 [bridge] This is caused by bridge netfilter special dst_entry (fake_rtable), a special shared entry, where attaching an inetpeer makes no sense. Problem is present since commit 87c48fa3b46 (ipv6: make fragment identifications less predictable) Introduce DST_NOPEER dst flag and make sure ipv6_select_ident() and __ip_select_ident() fallback to the 'no peer attached' handling. Reported-by: Chris Boot Tested-by: Chris Boot Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman Change-Id: Id23270aae3214c26691f95922a63c70549232c22 Reviewed-on: http://git-master/r/74224 Reviewed-by: Varun Wadekar Tested-by: Varun Wadekar --- net/bridge/br_netfilter.c | 2 +- net/ipv4/route.c | 4 ++-- net/ipv6/ip6_output.c | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) (limited to 'net') diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c index d6ec3720c77e..5693e5f9e03e 100644 --- a/net/bridge/br_netfilter.c +++ b/net/bridge/br_netfilter.c @@ -141,7 +141,7 @@ void br_netfilter_rtable_init(struct net_bridge *br) rt->dst.dev = br->dev; rt->dst.path = &rt->dst; dst_init_metrics(&rt->dst, br_dst_default_metrics, true); - rt->dst.flags = DST_NOXFRM; + rt->dst.flags = DST_NOXFRM | DST_NOPEER; rt->dst.ops = &fake_dst_ops; } diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 05ac666c3301..4e9bfc6c0c1d 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1272,7 +1272,7 @@ void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) { struct rtable *rt = (struct rtable *) dst; - if (rt) { + if (rt && !(rt->dst.flags & DST_NOPEER)) { if (rt->peer == NULL) rt_bind_peer(rt, rt->rt_dst, 1); @@ -1283,7 +1283,7 @@ void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) iph->id = htons(inet_getid(rt->peer, more)); return; } - } else + } else if (!rt) printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", __builtin_return_address(0)); diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 4c882cf4e8a1..55a35c1dede1 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -606,7 +606,7 @@ void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt) static atomic_t ipv6_fragmentation_id; int old, new; - if (rt) { + if (rt && !(rt->dst.flags & DST_NOPEER)) { struct inet_peer *peer; if (!rt->rt6i_peer) -- cgit v1.2.3