[NETFILTER]: nfnetlink_queue: allow changing queue length through netlink

Signed-off-by: Eric Leblond <[e-mail]>
Signed-off-by: Patrick McHardy <[e-mail]>

include/linux/netfilter/nfnetlink_queue.h

···
 	NFQA_CFG_UNSPEC,
 	NFQA_CFG_CMD,			/* nfqnl_msg_config_cmd */
 	NFQA_CFG_PARAMS,		/* nfqnl_msg_config_params */
+	NFQA_CFG_QUEUE_MAXLEN,		/* u_int32_t */
 	__NFQA_CFG_MAX
 };
 #define NFQA_CFG_MAX (__NFQA_CFG_MAX-1)

net/netfilter/nfnetlink_queue.c

···
 				ntohl(params->copy_range));
 	}
 
+	if (nfqa[NFQA_CFG_QUEUE_MAXLEN-1]) {
+		__be32 *queue_maxlen;
+		queue_maxlen = NFA_DATA(nfqa[NFQA_CFG_QUEUE_MAXLEN-1]);
+		spin_lock_bh(&queue->lock);
+		queue->queue_maxlen = ntohl(*queue_maxlen);
+		spin_unlock_bh(&queue->lock);
+	}
+
 out_put:
 	instance_put(queue);
 	return ret;