[PATCH net v2 2/8] net: ipip: implement header_ops->parse_protocol for AF_PACKET

[Jason A. Donenfeld]

Ipip uses skb->protocol to determine packet type, and bails out if it's
not set. 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 ipip rejects the
skb. So, this wires up the ip_tunnel handler for layer 3 packets for
that case.

Signed-off-by: Jason A. Donenfeld <ja...@zx2c4.com>
---
 net/ipv4/ipip.c       | 1 +
 net/ipv6/ip6_tunnel.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 40fea52c8277..75d35e76bec2 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -361,6 +361,7 @@ static const struct net_device_ops ipip_netdev_ops = {
 static void ipip_tunnel_setup(struct net_device *dev)
 {
        dev->netdev_ops         = &ipip_netdev_ops;
+       dev->header_ops         = &ip_tunnel_header_ops;
 
        dev->type               = ARPHRD_TUNNEL;
        dev->flags              = IFF_NOARP;
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 821d96c720b9..a18c378ca5f4 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1846,6 +1846,7 @@ static const struct net_device_ops ip6_tnl_netdev_ops = {
 static void ip6_tnl_dev_setup(struct net_device *dev)
 {
        dev->netdev_ops = &ip6_tnl_netdev_ops;
+       dev->header_ops = &ip_tunnel_header_ops;
        dev->needs_free_netdev = true;
        dev->priv_destructor = ip6_dev_free;
 
-- 
2.27.0