icmp6: Call skb_checksum_validate

Use skb_checksum_validate to verify checksum.
Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/icmp.c

@@ -692,23 +692,12 @@ static int icmpv6_rcv(struct sk_buff *skb)
 	saddr = &ipv6_hdr(skb)->saddr;
 	daddr = &ipv6_hdr(skb)->daddr;
 
-	/* Perform checksum. */
-	switch (skb->ip_summed) {
-	case CHECKSUM_COMPLETE:
-		if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
-				     skb->csum))
-			break;
-		/* fall through */
-	case CHECKSUM_NONE:
-		skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len,
-					     IPPROTO_ICMPV6, 0));
-		if (__skb_checksum_complete(skb)) {
+	if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) {
 		LIMIT_NETDEBUG(KERN_DEBUG
 			       "ICMPv6 checksum failed [%pI6c > %pI6c]\n",
 			       saddr, daddr);
 		goto csum_error;
 	}
-	}
 
 	if (!pskb_pull(skb, sizeof(*hdr)))
 		goto discard_it;