]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commit
ipv6: always prefer rt6i_gateway if present
authorJulian Anastasov <ja@ssi.bg>
Sun, 20 Oct 2013 12:43:03 +0000 (15:43 +0300)
committerDavid S. Miller <davem@davemloft.net>
Mon, 21 Oct 2013 22:37:00 +0000 (18:37 -0400)
commit96dc809514fb2328605198a0602b67554d8cce7b
tree573048781c3f44e88f25cab3ff2c277aeec65316
parent4440c6f7d5f3df81077d87dee52b2f8120610967
ipv6: always prefer rt6i_gateway if present

In v3.9 6fd6ce2056de2709 ("ipv6: Do not depend on rt->n in
ip6_finish_output2()." changed the behaviour of ip6_finish_output2()
such that the recently introduced rt6_nexthop() is used
instead of an assigned neighbor.

As rt6_nexthop() prefers rt6i_gateway only for gatewayed
routes this causes a problem for users like IPVS, xt_TEE and
RAW(hdrincl) if they want to use different address for routing
compared to the destination address.

Another case is when redirect can create RTF_DYNAMIC
route without RTF_GATEWAY flag, we ignore the rt6i_gateway
in rt6_nexthop().

Fix the above problems by considering the rt6i_gateway if
present, so that traffic routed to address on local subnet is
not wrongly diverted to the destination address.

Thanks to Simon Horman and Phil Oester for spotting the
problematic commit.

Thanks to Hannes Frederic Sowa for his review and help in testing.

Reported-by: Phil Oester <kernel@linuxace.com>
Reported-by: Mark Brooks <mark@loadbalancer.org>
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/ip6_route.h