device: implement header_ops->parse_protocol for AF_PACKET
WireGuard uses skb->protocol to determine packet type, and bails out if
it's not set or set to something it's not expecting. For AF_PACKET
injection, we need to support its call chain of:
packet_sendmsg -> packet_snd -> packet_parse_headers ->
dev_parse_header_protocol -> parse_protocol
Without a valid parse_protocol, this returns zero, and wireguard then
rejects the skb. So, this wires up the ip_tunnel handler for layer 3
packets for that case.
Reported-by: Hans Wippel <ndev@hwipl.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
WireGuard was merged into the Linux kernel for 5.6. This repository contains a backport of WireGuard for kernels 3.10 to 5.5, as an out of tree module.
More information may be found at WireGuard.com.
This project is released under the GPLv2.