[NETFILTER]: Add "nfnetlink_queue" netfilter queue handler over nfnetlink

- Add new nfnetlink_queue module
- Add new ipt_NFQUEUE and ip6t_NFQUEUE modules to access queue numbers 1-65535
- Mark ip_queue and ip6_queue Kconfig options as OBSOLETE
- Update feature-removal-schedule to remove ip[6]_queue in December

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/netfilter/Kconfig

@@ -110,11 +110,15 @@ config IP_NF_AMANDA
 	  To compile it as a module, choose M here.  If unsure, say Y.
 
 config IP_NF_QUEUE
-	tristate "Userspace queueing via NETLINK"
+	tristate "IP Userspace queueing via NETLINK (OBSOLETE)"
 	help
 	  Netfilter has the ability to queue packets to user space: the
 	  netlink device can be used to access them using this driver.
 
+	  This option enables the old IPv4-only "ip_queue" implementation
+	  which has been obsoleted by the new "nfnetlink_queue" code (see
+	  CONFIG_NETFILTER_NETLINK_QUEUE).
+
 	  To compile it as a module, choose M here.  If unsure, say N.
 
 config IP_NF_IPTABLES

net/ipv4/netfilter/Makefile

@@ -91,3 +91,4 @@ obj-$(CONFIG_IP_NF_ARP_MANGLE) += arpt_mangle.o
 obj-$(CONFIG_IP_NF_ARPFILTER) += arptable_filter.o
 
 obj-$(CONFIG_IP_NF_QUEUE) += ip_queue.o
+obj-$(CONFIG_NETFILTER_NETLINK_QUEUE) += ipt_NFQUEUE.o

net/ipv4/netfilter/ipt_NFQUEUE.c

@@ -0,0 +1,70 @@
+/* iptables module for using new netfilter netlink queue
+ *
+ * (C) 2005 by Harald Welte <laforge@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as 
+ * published by the Free Software Foundation.
+ * 
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_NFQUEUE.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("iptables NFQUEUE target");
+MODULE_LICENSE("GPL");
+
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const void *targinfo,
+       void *userinfo)
+{
+	const struct ipt_NFQ_info *tinfo = targinfo;
+
+	return NF_QUEUE_NR(tinfo->queuenum);
+}
+
+static int
+checkentry(const char *tablename,
+	   const struct ipt_entry *e,
+           void *targinfo,
+           unsigned int targinfosize,
+           unsigned int hook_mask)
+{
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_NFQ_info))) {
+		printk(KERN_WARNING "NFQUEUE: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IPT_ALIGN(sizeof(struct ipt_NFQ_info)));
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_NFQ_reg = {
+	.name		= "NFQUEUE",
+	.target		= target,
+	.checkentry	= checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&ipt_NFQ_reg);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&ipt_NFQ_reg);
+}
+
+module_init(init);
+module_exit(fini);