[Feature] Support Raw IP interfaces (e.g. WireGuard)

[rsp4jack]

tcpreplay does not seems to work on level-3 only interfaces like WireGuard.

Warning: Unsupported physical layer type 0xfffe on wg0.  Maybe it works, maybe it won't.  See tickets #123/318
Warning: Unable to send packet: Error with PF_PACKET send() [1]: Protocol not supported (errno = 93)
Warning: flow_decode failed to determine Ethernet header length for packet 2
Warning: Unable to send packet: Error with PF_PACKET send() [2]: Protocol not supported (errno = 93)
Warning: flow_decode failed to determine Ethernet header length for packet 3
...

[JeGoBE8900]

I probably have same issue as you:

1. Sending TZSP stream from Mikrotik device to linux host
2. On linux host, sudo tzsp2pcap -f -p 37008 | sudo tcpreplay --topspeed -i wlan0 -

Warning in flows.c:flow_decode() line 203:
flow_decode failed to determine Ethernet header length for packet 2783