[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/ipv6/netfilter/Kconfig

@@ -10,13 +10,16 @@ menu "IPv6: Netfilter Configuration (EXPERIMENTAL)"
 #  dep_tristate '  FTP protocol support' CONFIG_IP6_NF_FTP $CONFIG_IP6_NF_CONNTRACK
 #fi
 config IP6_NF_QUEUE
-	tristate "Userspace queueing via NETLINK"
+	tristate "IP6 Userspace queueing via NETLINK (OBSOLETE)"
 	---help---
 
 	  This option adds a queue handler to the kernel for IPv6
-	  packets which lets us to receive the filtered packets
-	  with QUEUE target using libiptc as we can do with
-	  the IPv4 now.
+	  packets which enables users to receive the filtered packets
+	  with QUEUE target using libipq.
+
+	  THis option enables the old IPv6-only "ip6_queue" implementation
+	  which has been obsoleted by the new "nfnetlink_queue" code (see
+	  CONFIG_NETFILTER_NETLINK_QUEUE).
 
 	  (C) Fernando Anton 2001
 	  IPv64 Project - Work based in IPv64 draft by Arturo Azcorra.

net/ipv6/netfilter/Makefile

@@ -24,3 +24,4 @@ obj-$(CONFIG_IP6_NF_QUEUE) += ip6_queue.o
 obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o
 obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
 obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o
+obj-$(CONFIG_NETFILTER_NETLINK_QUEUE) += ip6t_NFQUEUE.o

net/ipv6/netfilter/ip6t_NFQUEUE.c

@@ -0,0 +1,70 @@
+/* ip6tables 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_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv4/ipt_NFQUEUE.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("ip6tables 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 ip6t_entry *e,
+           void *targinfo,
+           unsigned int targinfosize,
+           unsigned int hook_mask)
+{
+	if (targinfosize != IP6T_ALIGN(sizeof(struct ipt_NFQ_info))) {
+		printk(KERN_WARNING "NFQUEUE: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IP6T_ALIGN(sizeof(struct ipt_NFQ_info)));
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ip6t_target ipt_NFQ_reg = {
+	.name		= "NFQUEUE",
+	.target		= target,
+	.checkentry	= checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ip6t_register_target(&ipt_NFQ_reg);
+}
+
+static void __exit fini(void)
+{
+	ip6t_unregister_target(&ipt_NFQ_reg);
+}
+
+module_init(init);
+module_exit(fini);