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    Subject[PATCH 3.4 02/32] ipv6: use rt6_get_dflt_router to get default router in rt6_route_rcv
    Date
    3.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Duan Jiong <duanj.fnst@cn.fujitsu.com>

    [ Upstream commit f104a567e673f382b09542a8dc3500aa689957b4 ]

    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>
    ---
    net/ipv6/route.c | 7 +++++--
    1 file changed, 5 insertions(+), 2 deletions(-)

    --- a/net/ipv6/route.c
    +++ b/net/ipv6/route.c
    @@ -617,8 +617,11 @@ int rt6_route_rcv(struct net_device *dev
    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);



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