net/ipv6: update flowi6_oif in ip6_dst_lookup_flow if not set
authorPhil Sutter <phil@nwl.cc>
Wed, 15 Jul 2015 19:56:26 +0000 (21:56 +0200)
committerDavid S. Miller <davem@davemloft.net>
Mon, 20 Jul 2015 19:59:32 +0000 (12:59 -0700)
commita0a9f33bdf8bf9061c31faab46d8eb46ff644622
treeefcf1e177085ba336c29320c099fcb046de5b245
parent22f94e625635fb8555f5e7361745ea780a3853e4
net/ipv6: update flowi6_oif in ip6_dst_lookup_flow if not set

Newly created flows don't have flowi6_oif set (at least if the
associated socket is not interface-bound). This leads to a mismatch in
__xfrm6_selector_match() for policies which specify an interface in the
selector (sel->ifindex != 0).

Backtracing shows this happens in code-paths originating from e.g.
ip6_datagram_connect(), rawv6_sendmsg() or tcp_v6_connect(). (UDP was
not tested for.)

In summary, this patch fixes policy matching on outgoing interface for
locally generated packets.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv6/ip6_output.c