xfrm: prefer family stored in xfrm_mode struct

Now that we have the family available directly in the
xfrm_mode struct, we can use that and avoid one extra dereference.
Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/ipv4/ip_vti.c

@@ -137,7 +137,7 @@ static int vti_rcv_cb(struct sk_buff *skb, int err)
 		}
 	}
 
-	family = inner_mode->afinfo->family;
+	family = inner_mode->family;
 
 	skb->mark = be32_to_cpu(tunnel->parms.i_key);
 	ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);

net/ipv6/ip6_vti.c

@@ -372,7 +372,7 @@ static int vti6_rcv_cb(struct sk_buff *skb, int err)
 		}
 	}
 
-	family = inner_mode->afinfo->family;
+	family = inner_mode->family;
 
 	skb->mark = be32_to_cpu(t->parms.i_key);
 	ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);

net/xfrm/xfrm_input.c

@@ -216,7 +216,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 			goto drop;
 		}
 
-		family = x->outer_mode->afinfo->family;
+		family = x->outer_mode->family;
 
 		/* An encap_type of -1 indicates async resumption. */
 		if (encap_type == -1) {
@@ -425,7 +425,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 		 * transport mode so the outer address is identical.
 		 */
 		daddr = &x->id.daddr;
-		family = x->outer_mode->afinfo->family;
+		family = x->outer_mode->family;
 
 		err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
 		if (err < 0) {

net/xfrm/xfrm_interface.c

@@ -285,7 +285,7 @@ static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
 		}
 
 		if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb,
-				       inner_mode->afinfo->family))
+				       inner_mode->family))
 			return -EPERM;
 	}