[PATCH 12/16 net-next v3] netfilter: ipv4: guard ip_route_me_harder() with CONFIG_IPV4

[Fernando Fernandez Mancera]

To enable compiling the network stack without IPv4, IPv4 specific packet
rerouting logic inside netfilter must be bypassed. Therefore, guard
ip_route_me_harder() with IS_ENABLED(CONFIG_IPV4) so it returns
-EPROTONOSUPPORT when IPv4 is disabled.

Signed-off-by: Fernando Fernandez Mancera <fmancera@xxxxxxx>
---
 net/ipv4/netfilter.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c
index ce9e1bfa4259..f2d9e0110b77 100644
--- a/net/ipv4/netfilter.c
+++ b/net/ipv4/netfilter.c
@@ -30,6 +30,9 @@ int ip_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb, un
 	struct flow_keys flkeys;
 	unsigned int hh_len;
 
+	if (!IS_ENABLED(CONFIG_IPV4))
+		return -EPROTONOSUPPORT;
+
 	sk = sk_to_full_sk(sk);
 	flags = sk ? inet_sk_flowi_flags(sk) : 0;
 
-- 
2.55.0