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tun: implement header_ops->parse_protocol for AF_PACKET

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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>
This commit is contained in:
Jason A. Donenfeld 2020-06-29 19:06:22 -06:00 committed by David S. Miller
parent 1a574074ae
commit b9815eb1d1
1 changed files with 2 additions and 0 deletions
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2
drivers/net/tun.c
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@ -62,6 +62,7 @@
#include <net/rtnetlink.h>
#include <net/sock.h>
#include <net/xdp.h>
#include <net/ip_tunnels.h>
#include <linux/seq_file.h>
#include <linux/uio.h>
#include <linux/skb_array.h>
@ -1351,6 +1352,7 @@ static void tun_net_init(struct net_device *dev)
switch (tun->flags & TUN_TYPE_MASK) {
case IFF_TUN:
dev->netdev_ops = &tun_netdev_ops;
dev->header_ops = &ip_tunnel_header_ops;
/* Point-to-Point TUN Device */
dev->hard_header_len = 0;