[NETFILTER]: ip6t_mh: drop piggyback payload packet on MH packets

Regarding RFC3775, MH payload proto field should be IPPROTO_NONE. Otherwise
it must be discarded (and the receiver should send ICMP error).

We assume filter should drop such piggyback everytime to disallow slipping
through firewall rules, even the final receiver will discard it.
Signed-off-by: NMasahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/netfilter/ip6t_mh.c

@@ -66,6 +66,13 @@ match(const struct sk_buff *skb,
 		return 0;
 	}
 
+	if (mh->ip6mh_proto != IPPROTO_NONE) {
+		duprintf("Dropping invalid MH Payload Proto: %u\n",
+			 mh->ip6mh_proto);
+		*hotdrop = 1;
+		return 0;
+	}
+
 	return type_match(mhinfo->types[0], mhinfo->types[1], mh->ip6mh_type,
 			  !!(mhinfo->invflags & IP6T_MH_INV_TYPE));
 }