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: NPhil Sutter <phil@nwl.cc> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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