net/sched: act_ct: Use pskb_network_may_pull()

To make the filler functions more generic, use network
relative skb pulling.
Signed-off-by: Paul Blakey <paulb@mellanox.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/act_ct.c

@@ -195,7 +195,7 @@ tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
 	unsigned int thoff;
 	struct iphdr *iph;
 
-	if (!pskb_may_pull(skb, sizeof(*iph)))
+	if (!pskb_network_may_pull(skb, sizeof(*iph)))
 		return false;
 
 	iph = ip_hdr(skb);
@@ -212,7 +212,7 @@ tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
 	if (iph->ttl <= 1)
 		return false;
 
-	if (!pskb_may_pull(skb, iph->protocol == IPPROTO_TCP ?
+	if (!pskb_network_may_pull(skb, iph->protocol == IPPROTO_TCP ?
 					thoff + sizeof(struct tcphdr) :
 					thoff + sizeof(*ports)))
 		return false;
@@ -241,7 +241,7 @@ tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
 	struct ipv6hdr *ip6h;
 	unsigned int thoff;
 
-	if (!pskb_may_pull(skb, sizeof(*ip6h)))
+	if (!pskb_network_may_pull(skb, sizeof(*ip6h)))
 		return false;
 
 	ip6h = ipv6_hdr(skb);
@@ -254,7 +254,7 @@ tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
 		return false;
 
 	thoff = sizeof(*ip6h);
-	if (!pskb_may_pull(skb, ip6h->nexthdr == IPPROTO_TCP ?
+	if (!pskb_network_may_pull(skb, ip6h->nexthdr == IPPROTO_TCP ?
 					thoff + sizeof(struct tcphdr) :
 					thoff + sizeof(*ports)))
 		return false;