netfilter: nfnetlink_queue: fix maximum packet length to userspace

The packets that we send via NFQUEUE are encapsulated in the NFQA_PAYLOAD
attribute. The length of the packet in userspace is obtained via
attr->nla_len field. This field contains the size of the Netlink
attribute header plus the packet length.

If the maximum packet length is specified, ie. 65535 bytes, and
packets in the range of (65531,65535] are sent to userspace, the
attr->nla_len overflows and it reports bogus lengths to the
application.

To fix this, this patch limits the maximum packet length to 65531
bytes. If larger packet length is specified, the packet that we
send to user-space is truncated to 65531 bytes.

To support 65535 bytes packets, we have to revisit the idea of
the 32-bits Netlink attribute length.
Reported-by: NFlorian Westphal <fw@strlen.de>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nfnetlink_queue_core.c

@@ -526,9 +526,13 @@ nfqnl_set_mode(struct nfqnl_instance *queue,
 
 	case NFQNL_COPY_PACKET:
 		queue->copy_mode = mode;
-		/* we're using struct nlattr which has 16bit nla_len */
-		if (range > 0xffff)
-			queue->copy_range = 0xffff;
+		/* We're using struct nlattr which has 16bit nla_len. Note that
+		 * nla_len includes the header length. Thus, the maximum packet
+		 * length that we support is 65531 bytes. We send truncated
+		 * packets if the specified length is larger than that.
+		 */
+		if (range > 0xffff - NLA_HDRLEN)
+			queue->copy_range = 0xffff - NLA_HDRLEN;
 		else
 			queue->copy_range = range;
 		break;