Commit 9fc3bbb4 authored Jan 03, 2011 by Joel Sing Committed by David S. Miller Jan 04, 2011

ipv4/route.c: respect prefsrc for local routes



The preferred source address is currently ignored for local routes,
which results in all local connections having a src address that is the
same as the local dst address. Fix this by respecting the preferred source
address when it is provided for local routes.

This bug can be demonstrated as follows:

 # ifconfig dummy0 192.168.0.1
 # ip route show table local | grep local.*dummy0
 local 192.168.0.1 dev dummy0  proto kernel  scope host  src 192.168.0.1
 # ip route change table local local 192.168.0.1 dev dummy0 \
     proto kernel scope host src 127.0.0.1
 # ip route show table local | grep local.*dummy0
 local 192.168.0.1 dev dummy0  proto kernel  scope host  src 127.0.0.1

We now establish a local connection and verify the source IP
address selection:

 # nc -l 192.168.0.1 3128 &
 # nc 192.168.0.1 3128 &
 # netstat -ant | grep 192.168.0.1:3128.*EST
 tcp        0      0 192.168.0.1:3128        192.168.0.1:33228 ESTABLISHED
 tcp        0      0 192.168.0.1:33228       192.168.0.1:3128  ESTABLISHED

Signed-off-by: Joel Sing <jsing@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent e6f26129

net/ipv4/route.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -2649,8 +2649,12 @@ static int ip_route_output_slow(struct net net, struct rtable *rp,
		}

		if (res.type == RTN_LOCAL) {
		if (!fl.fl4_src)
		if (!fl.fl4_src) {
		if (res.fi->fib_prefsrc)
		fl.fl4_src = res.fi->fib_prefsrc;
		else
		fl.fl4_src = fl.fl4_dst;
		}
		dev_out = net->loopback_dev;
		fl.oif = dev_out->ifindex;
		res.fi = NULL;

Admin message