ipv4: Only compute net once in ip_rcv_finish

Signed-off-by: N"Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/ip_input.c

@@ -314,6 +314,7 @@ EXPORT_SYMBOL(sysctl_ip_early_demux);
 static int ip_rcv_finish(struct sock *sk, struct sk_buff *skb)
 {
 	const struct iphdr *iph = ip_hdr(skb);
+	struct net *net = dev_net(skb->dev);
 	struct rtable *rt;
 
 	if (sysctl_ip_early_demux && !skb_dst(skb) && !skb->sk) {
@@ -337,8 +338,7 @@ static int ip_rcv_finish(struct sock *sk, struct sk_buff *skb)
 					       iph->tos, skb->dev);
 		if (unlikely(err)) {
 			if (err == -EXDEV)
-				NET_INC_STATS_BH(dev_net(skb->dev),
-						 LINUX_MIB_IPRPFILTER);
+				NET_INC_STATS_BH(net, LINUX_MIB_IPRPFILTER);
 			goto drop;
 		}
 	}
@@ -359,11 +359,9 @@ static int ip_rcv_finish(struct sock *sk, struct sk_buff *skb)
 
 	rt = skb_rtable(skb);
 	if (rt->rt_type == RTN_MULTICAST) {
-		IP_UPD_PO_STATS_BH(dev_net(rt->dst.dev), IPSTATS_MIB_INMCAST,
-				skb->len);
+		IP_UPD_PO_STATS_BH(net, IPSTATS_MIB_INMCAST, skb->len);
 	} else if (rt->rt_type == RTN_BROADCAST)
-		IP_UPD_PO_STATS_BH(dev_net(rt->dst.dev), IPSTATS_MIB_INBCAST,
-				skb->len);
+		IP_UPD_PO_STATS_BH(net, IPSTATS_MIB_INBCAST, skb->len);
 
 	return dst_input(skb);