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[ICMP]: Fix icmp_errors_use_inbound_ifaddr sysctl

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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 <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-06-01 11:45:04 -07:00 committed by David S. Miller
parent 584bdf8cbd
commit 6e1d91039b
1 changed files with 9 additions and 6 deletions
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15
net/ipv4/icmp.c
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@ -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;
}