[NETFILTER]: nfnetlink_queue: fix nfnetlink message size

Fix oversized message, use NLMSG_SPACE just one since it reserves space
for the netlink header and NFA_SPACE for every attribute.

Thanks to Harald Welte for the feedback

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/netfilter/nfnetlink_queue.c

@@ -354,16 +354,17 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
 	QDEBUG("entered\n");
 
 	/* all macros expand to constant values at compile time */
-	size =    NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hdr))
-		+ NLMSG_SPACE(sizeof(u_int32_t))	/* ifindex */
-		+ NLMSG_SPACE(sizeof(u_int32_t))	/* ifindex */
+	size =    NLMSG_SPACE(sizeof(struct nfgenmsg)) +
+		+ NFA_SPACE(sizeof(struct nfqnl_msg_packet_hdr))
+		+ NFA_SPACE(sizeof(u_int32_t))	/* ifindex */
+		+ NFA_SPACE(sizeof(u_int32_t))	/* ifindex */
 #ifdef CONFIG_BRIDGE_NETFILTER
-		+ NLMSG_SPACE(sizeof(u_int32_t))	/* ifindex */
-		+ NLMSG_SPACE(sizeof(u_int32_t))	/* ifindex */
+		+ NFA_SPACE(sizeof(u_int32_t))	/* ifindex */
+		+ NFA_SPACE(sizeof(u_int32_t))	/* ifindex */
 #endif
-		+ NLMSG_SPACE(sizeof(u_int32_t))	/* mark */
-		+ NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hw))
-		+ NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_timestamp));
+		+ NFA_SPACE(sizeof(u_int32_t))	/* mark */
+		+ NFA_SPACE(sizeof(struct nfqnl_msg_packet_hw))
+		+ NFA_SPACE(sizeof(struct nfqnl_msg_packet_timestamp));
 
 	outdev = entinf->outdev;
 
@@ -388,7 +389,7 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
 		else
 			data_len = queue->copy_range;
 
-		size += NLMSG_SPACE(data_len);
+		size += NFA_SPACE(data_len);
 		break;
 
 	default: