[ICMP]: Fix icmp_errors_use_inbound_ifaddr sysctl Currently when icmp_errors_use_inbound_ifaddr is set and an ICMP error is sent after the packet passed through ip_output(), an address from the outgoing interface is chosen as ICMP source address since skb->dev doesn't point to the incoming interface anymore. Fix this by doing an interface lookup on rt->dst.iif and using that device. Signed-off-by: Patrick McHardy --- commit f680f41a1c6b2c358a4725e763132b3c61c1685a tree 81f9cd86744aca6e7c2bc647639f7868d7ceb1d3 parent 19b6cbad06d246d48168fc6c493a7c3d9db58e1f author Patrick McHardy Fri, 01 Jun 2007 19:22:21 +0200 committer Patrick McHardy Fri, 01 Jun 2007 19:22:21 +0200 net/ipv4/icmp.c | 15 +++++++++------ 1 files changed, 9 insertions(+), 6 deletions(-) diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index e238b17..02a899b 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -514,12 +514,15 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info) saddr = iph->daddr; if (!(rt->rt_flags & RTCF_LOCAL)) { - /* This is broken, skb_in->dev points to the outgoing device - * after the packet passes through ip_output(). - */ - if (skb_in->dev && sysctl_icmp_errors_use_inbound_ifaddr) - saddr = inet_select_addr(skb_in->dev, 0, RT_SCOPE_LINK); - else + struct net_device *dev = NULL; + + if (rt->fl.iif && sysctl_icmp_errors_use_inbound_ifaddr) + dev = dev_get_by_index(rt->fl.iif); + + if (dev) { + saddr = inet_select_addr(dev, 0, RT_SCOPE_LINK); + dev_put(dev); + } else saddr = 0; }