ipv4: raw: Fix sending packets from raw sockets via IPsec tunnels

Since the referenced commit, the xfrm_inner_extract_output() function
uses the protocol field to determine the address family.  So not setting
it for IPv4 raw sockets meant that such packets couldn't be tunneled via
IPsec anymore.

IPv6 raw sockets are not affected as they already set the protocol since
9c9c9ad ("ipv6: set skb->protocol on tcp, raw and ip6_append_data
genereated skbs").

Fixes: f479639 ("xfrm: Remove inner/outer modes from output path")
Signed-off-by: Tobias Brunner <[email protected]>
Reviewed-by: David Ahern <[email protected]>
Reviewed-by: Nicolas Dichtel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: tobiasbrunner

net/ipv4/raw.c

@@ -357,6 +357,7 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
 		goto error;
 	skb_reserve(skb, hlen);
 
+	skb->protocol = htons(ETH_P_IP);
 	skb->priority = READ_ONCE(sk->sk_priority);
 	skb->mark = sockc->mark;
 	skb->tstamp = sockc->transmit_time;