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authorDuan Jiong <duanj.fnst@cn.fujitsu.com>2013-09-04 19:44:21 +0800
committerDavid S. Miller <davem@davemloft.net>2013-09-05 12:44:31 -0400
commitb55b76b22144ab97cefcb3862bab61f088adf411 (patch)
tree653c9c8e67466faf48321d35ced7c9dc95f651fd /net/ipv6/ah6.c
parent60cad4e67bd6ff400e7ea61fe762b3042b12ae9d (diff)
downloadop-kernel-dev-b55b76b22144ab97cefcb3862bab61f088adf411.zip
op-kernel-dev-b55b76b22144ab97cefcb3862bab61f088adf411.tar.gz
ipv6:introduce function to find route for redirect
RFC 4861 says that the IP source address of the Redirect is the same as the current first-hop router for the specified ICMP Destination Address, so the gateway should be taken into consideration when we find the route for redirect. There was once a check in commit a6279458c534d01ccc39498aba61c93083ee0372 ("NDISC: Search over all possible rules on receipt of redirect.") and the check went away in commit b94f1c0904da9b8bf031667afc48080ba7c3e8c9 ("ipv6: Use icmpv6_notify() to propagate redirect, instead of rt6_redirect()"). The bug is only "exploitable" on layer-2 because the source address of the redirect is checked to be a valid link-local address but it makes spoofing a lot easier in the same L2 domain nonetheless. Thanks very much for Hannes's help. Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ah6.c')
-rw-r--r--net/ipv6/ah6.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index bb02e17..73784c3 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -628,7 +628,7 @@ static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
return;
if (type == NDISC_REDIRECT)
- ip6_redirect(skb, net, 0, 0);
+ ip6_redirect(skb, net, skb->dev->ifindex, 0);
else
ip6_update_pmtu(skb, net, info, 0, 0);
xfrm_state_put(x);
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