netfilter: nf_nat_proto_icmpv6:: fix wrong comparison in icmpv6_manip_pkt

In commit 58a317f1 (netfilter: ipv6: add IPv6 NAT support), icmpv6_manip_pkt
was added with an incorrect comparison of ICMP codes to types. This causes
problems when using NAT rules with the --random option. Correct the
comparison.

This closes netfilter bugzilla #851, reported by Alexander Neumann.

Signed-off-by: Phil Oester <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

net/ipv6/netfilter/nf_nat_proto_icmpv6.c

···
 	hdr = (struct icmp6hdr *)(skb->data + hdroff);
 	l3proto->csum_update(skb, iphdroff, &hdr->icmp6_cksum,
 			     tuple, maniptype);
-	if (hdr->icmp6_code == ICMPV6_ECHO_REQUEST ||
-	    hdr->icmp6_code == ICMPV6_ECHO_REPLY) {
+	if (hdr->icmp6_type == ICMPV6_ECHO_REQUEST ||
+	    hdr->icmp6_type == ICMPV6_ECHO_REPLY) {
 		inet_proto_csum_replace2(&hdr->icmp6_cksum, skb,
 					 hdr->icmp6_identifier,
 					 tuple->src.u.icmp.id, 0);