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ipv6: use rt6_get_dflt_router to get default router in rt6_route_rcv

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[ Upstream commit f104a567e6 ]

As the rfc 4191 said, the Router Preference and Lifetime values in a
::/0 Route Information Option should override the preference and lifetime
values in the Router Advertisement header. But when the kernel deals with
a ::/0 Route Information Option, the rt6_get_route_info() always return
NULL, that means that overriding will not happen, because those default
routers were added without flag RTF_ROUTEINFO in rt6_add_dflt_router().

In order to deal with that condition, we should call rt6_get_dflt_router
when the prefix length is 0.

Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Duan Jiong
2013-11-08 09:56:53 +08:00
committed by Greg Kroah-Hartman
parent d9160deb04
commit ea136c0d81
1 changed files with 5 additions and 2 deletions
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7
net/ipv6/route.c
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@@ -728,8 +728,11 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
prefix = &prefix_buf;
}
rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
dev->ifindex);
if (rinfo->prefix_len == 0)
rt = rt6_get_dflt_router(gwaddr, dev);
else
rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
gwaddr, dev->ifindex);
if (rt && !lifetime) {
ip6_del_rt(rt);