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| H A D | tun.c | diff b9815eb1d13f0dc088ee8afb6e6d0683ea551098 Mon Jun 29 20:06:22 CDT 2020 Jason A. Donenfeld <Jason@zx2c4.com> tun: implement header_ops->parse_protocol for AF_PACKET
The tun driver passes up skb->protocol to userspace in the form of PI headers.
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 the tun driver
then gives userspace bogus values that it can't deal with.
Note that this isn't the case with tap, because tap already benefits
from the shared infrastructure for ethernet headers. But with tun,
there's nothing.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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