net/dump: Correctly compute Ethernet packet offset

net/dump: Correctly compute Ethernet packet offset

When a packet is sent with QEMU_NET_PACKET_FLAG_RAW by QEMU it
never includes virtio-net header even if qemu_get_vnet_hdr_len()
is not 0, and filter-dump is not managing this case.

The only user of QEMU_NET_PACKET_FLAG_RAW is announce_self,
we can show the problem using it and tcpddump:

- QEMU parameters:

  .. -monitor stdio \
     -netdev bridge,id=netdev0,br=virbr0 \
     -device virtio-net,mac=9a:2b:2c:2d:2e:2f,netdev=netdev0 \
     -object filter-dump,netdev=netdev0,file=log.pcap,id=pcap0

- HMP command:

  (qemu) announce_self

- TCP dump:

  $ tcpdump -nxr log.pcap

  without the fix:

    08:00:06:04:00:03 > 2e:2f:80:35:00:01, ethertype Unknown (0x9a2b), length 50:
         0x0000:  2c2d 2e2f 0000 0000 9a2b 2c2d 2e2f 0000
         0x0010:  0000 0000 0000 0000 0000 0000 0000 0000
         0x0020:  0000 0000

  with the fix:

    ARP, Reverse Request who-is 9a:2b:2c:2d:2e:2f tell 9a:2b:2c:2d:2e:2f, length 46
         0x0000:  0001 0800 0604 0003 9a2b 2c2d 2e2f 0000
         0x0010:  0000 9a2b 2c2d 2e2f 0000 0000 0000 0000
         0x0020:  0000 0000 0000 0000 0000 0000 0000

Fixes: 481c52320a26 ("net: Strip virtio-net header when dumping")
Cc: akihiko.odaki@daynix.com
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>