From: Patrick McHardy <kaber@trash.net>
Date: Fri, 1 Jun 2007 18:45:04 +0000 (-0700)
Subject: [ICMP]: Fix icmp_errors_use_inbound_ifaddr sysctl
X-Git-Tag: v2.6.22-rc4~5^2
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=6e1d91039becc9d5bcd046d8c709dbaf471220e3;p=linux-2.6-omap-h63xx.git

[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 <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index e238b17f554..02a899bec19 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;
 	}