netfilter: flowtable: use dev_fill_forward_path() to obtain egress device
The egress device in the tuple is obtained from route. Use dev_fill_forward_path() instead to provide the real egress device for this flow whenever this is available. The new FLOW_OFFLOAD_XMIT_DIRECT type uses dev_queue_xmit() to transmit ethernet frames. Cache the source and destination hardware address to use dev_queue_xmit() to transfer packets. The FLOW_OFFLOAD_XMIT_DIRECT replaces FLOW_OFFLOAD_XMIT_NEIGH if dev_fill_forward_path() finds a direct transmit path. In case of topology updates, if peer is moved to different bridge port, the connection will time out, reconnect will result in a new entry with the correct path. Snooping fdb updates would allow for cleaning up stale flowtable entries. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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