[patch 19/32] ICMP: Fix icmp_errors_use_inbound_ifaddr sysctl

From: Chris Wright
Date: Fri Jun 08 2007 - 03:29:20 EST


-stable review patch. If anyone has any objections, please let us know.
---------------------

From: David Miller <davem@xxxxxxxxxxxxx>

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@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>

---
net/ipv4/icmp.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

--- linux-2.6.20.13.orig/net/ipv4/icmp.c
+++ linux-2.6.20.13/net/ipv4/icmp.c
@@ -513,9 +513,15 @@ void icmp_send(struct sk_buff *skb_in, i

saddr = iph->daddr;
if (!(rt->rt_flags & RTCF_LOCAL)) {
- if (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;
}


--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/