smack: remove duplicated hook function

ipv4 and ipv6 hook functions are identical, remove one.
Signed-off-by: NFlorian Westphal <fw@strlen.de>
Signed-off-by: NCasey Schaufler <casey@schaufler-ca.com>

security/smack/smack_netfilter.c

@@ -18,27 +18,7 @@
 #include <net/net_namespace.h>
 #include "smack.h"
 
-#if IS_ENABLED(CONFIG_IPV6)
-
-static unsigned int smack_ipv6_output(void *priv,
-					struct sk_buff *skb,
-					const struct nf_hook_state *state)
-{
-	struct sock *sk = skb_to_full_sk(skb);
-	struct socket_smack *ssp;
-	struct smack_known *skp;
-
-	if (sk && sk->sk_security) {
-		ssp = sk->sk_security;
-		skp = ssp->smk_out;
-		skb->secmark = skp->smk_secid;
-	}
-
-	return NF_ACCEPT;
-}
-#endif	/* IPV6 */
-
-static unsigned int smack_ipv4_output(void *priv,
+static unsigned int smack_ip_output(void *priv,
 					struct sk_buff *skb,
 					const struct nf_hook_state *state)
 {
@@ -57,14 +37,14 @@ static unsigned int smack_ipv4_output(void *priv,
 
 static const struct nf_hook_ops smack_nf_ops[] = {
 	{
-		.hook =		smack_ipv4_output,
+		.hook =		smack_ip_output,
 		.pf =		NFPROTO_IPV4,
 		.hooknum =	NF_INET_LOCAL_OUT,
 		.priority =	NF_IP_PRI_SELINUX_FIRST,
 	},
 #if IS_ENABLED(CONFIG_IPV6)
 	{
-		.hook =		smack_ipv6_output,
+		.hook =		smack_ip_output,
 		.pf =		NFPROTO_IPV6,
 		.hooknum =	NF_INET_LOCAL_OUT,
 		.priority =	NF_IP6_PRI_SELINUX_FIRST,