netfilter: ipv6: Stop using NLA_PUT*().

These macros contain a hidden goto, and are thus extremely error
prone and make code hard to audit.

Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c

@@ -278,10 +278,11 @@ static struct nf_hook_ops ipv6_conntrack_ops[] __read_mostly = {
 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
 				const struct nf_conntrack_tuple *tuple)
 {
-	NLA_PUT(skb, CTA_IP_V6_SRC, sizeof(u_int32_t) * 4,
-		&tuple->src.u3.ip6);
-	NLA_PUT(skb, CTA_IP_V6_DST, sizeof(u_int32_t) * 4,
-		&tuple->dst.u3.ip6);
+	if (nla_put(skb, CTA_IP_V6_SRC, sizeof(u_int32_t) * 4,
+		    &tuple->src.u3.ip6) ||
+	    nla_put(skb, CTA_IP_V6_DST, sizeof(u_int32_t) * 4,
+		    &tuple->dst.u3.ip6))
+		goto nla_put_failure;
 	return 0;
 
 nla_put_failure:

net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c

@@ -234,10 +234,10 @@ icmpv6_error(struct net *net, struct nf_conn *tmpl,
 static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
 				  const struct nf_conntrack_tuple *t)
 {
-	NLA_PUT_BE16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id);
-	NLA_PUT_U8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type);
-	NLA_PUT_U8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code);
-
+	if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) ||
+	    nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) ||
+	    nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code))
+		goto nla_put_failure;
 	return 0;
 
 nla_put_failure:
@@ -300,8 +300,8 @@ icmpv6_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
 {
 	const unsigned int *timeout = data;
 
-	NLA_PUT_BE32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ));
-
+	if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ)))
+		goto nla_put_failure;
 	return 0;
 
 nla_put_failure: