netfilter: kill ulog targets

This has been marked as deprecated for quite some time and the NFLOG
target replacement has been also available since 2006.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/uapi/linux/netfilter_bridge/Kbuild

@@ -14,6 +14,5 @@ header-y += ebt_nflog.h
 header-y += ebt_pkttype.h
 header-y += ebt_redirect.h
 header-y += ebt_stp.h
-header-y += ebt_ulog.h
 header-y += ebt_vlan.h
 header-y += ebtables.h

include/uapi/linux/netfilter_bridge/ebt_ulog.h

@@ -1,38 +0,0 @@
-#ifndef _EBT_ULOG_H
-#define _EBT_ULOG_H
-
-#include <linux/types.h>
-
-#define EBT_ULOG_DEFAULT_NLGROUP 0
-#define EBT_ULOG_DEFAULT_QTHRESHOLD 1
-#define EBT_ULOG_MAXNLGROUPS 32 /* hardcoded netlink max */
-#define EBT_ULOG_PREFIX_LEN 32
-#define EBT_ULOG_MAX_QLEN 50
-#define EBT_ULOG_WATCHER "ulog"
-#define EBT_ULOG_VERSION 1
-
-struct ebt_ulog_info {
-	__u32 nlgroup;
-	unsigned int cprange;
-	unsigned int qthreshold;
-	char prefix[EBT_ULOG_PREFIX_LEN];
-};
-
-typedef struct ebt_ulog_packet_msg {
-	int version;
-	char indev[IFNAMSIZ];
-	char outdev[IFNAMSIZ];
-	char physindev[IFNAMSIZ];
-	char physoutdev[IFNAMSIZ];
-	char prefix[EBT_ULOG_PREFIX_LEN];
-	struct timeval stamp;
-	unsigned long mark;
-	unsigned int hook;
-	size_t data_len;
-	/* The complete packet, including Ethernet header and perhaps
-	 * the VLAN header is appended */
-	unsigned char data[0] __attribute__
-	                      ((aligned (__alignof__(struct ebt_ulog_info))));
-} ebt_ulog_packet_msg_t;
-
-#endif /* _EBT_ULOG_H */

include/uapi/linux/netfilter_ipv4/Kbuild

@@ -5,7 +5,6 @@ header-y += ipt_ECN.h
 header-y += ipt_LOG.h
 header-y += ipt_REJECT.h
 header-y += ipt_TTL.h
-header-y += ipt_ULOG.h
 header-y += ipt_ah.h
 header-y += ipt_ecn.h
 header-y += ipt_ttl.h

include/uapi/linux/netfilter_ipv4/ipt_ULOG.h

@@ -1,49 +0,0 @@
-/* Header file for IP tables userspace logging, Version 1.8
- *
- * (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
- * 
- * Distributed under the terms of GNU GPL */
-
-#ifndef _IPT_ULOG_H
-#define _IPT_ULOG_H
-
-#ifndef NETLINK_NFLOG
-#define NETLINK_NFLOG 	5
-#endif
-
-#define ULOG_DEFAULT_NLGROUP	1
-#define ULOG_DEFAULT_QTHRESHOLD	1
-
-#define ULOG_MAC_LEN	80
-#define ULOG_PREFIX_LEN	32
-
-#define ULOG_MAX_QLEN	50
-/* Why 50? Well... there is a limit imposed by the slab cache 131000
- * bytes. So the multipart netlink-message has to be < 131000 bytes.
- * Assuming a standard ethernet-mtu of 1500, we could define this up
- * to 80... but even 50 seems to be big enough. */
-
-/* private data structure for each rule with a ULOG target */
-struct ipt_ulog_info {
-	unsigned int nl_group;
-	size_t copy_range;
-	size_t qthreshold;
-	char prefix[ULOG_PREFIX_LEN];
-};
-
-/* Format of the ULOG packets passed through netlink */
-typedef struct ulog_packet_msg {
-	unsigned long mark;
-	long timestamp_sec;
-	long timestamp_usec;
-	unsigned int hook;
-	char indev_name[IFNAMSIZ];
-	char outdev_name[IFNAMSIZ];
-	size_t data_len;
-	char prefix[ULOG_PREFIX_LEN];
-	unsigned char mac_len;
-	unsigned char mac[ULOG_MAC_LEN];
-	unsigned char payload[0];
-} ulog_packet_msg_t;
-
-#endif /*_IPT_ULOG_H*/

net/bridge/netfilter/Kconfig

@@ -202,22 +202,6 @@ config BRIDGE_EBT_LOG
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-config BRIDGE_EBT_ULOG
-	tristate "ebt: ulog support (OBSOLETE)"
-	help
-	  This option enables the old bridge-specific "ebt_ulog" implementation
-	  which has been obsoleted by the new "nfnetlink_log" code (see
-	  CONFIG_NETFILTER_NETLINK_LOG).
-
-	  This option adds the ulog watcher, that you can use in any rule
-	  in any ebtables table. The packet is passed to a userspace
-	  logging daemon using netlink multicast sockets. This differs
-	  from the log watcher in the sense that the complete packet is
-	  sent to userspace instead of a descriptive text and that
-	  netlink multicast sockets are used instead of the syslog.
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 config BRIDGE_EBT_NFLOG
 	tristate "ebt: nflog support"
 	help

net/bridge/netfilter/ebt_ulog.c

@@ -1,393 +0,0 @@
-/*
- * netfilter module for userspace bridged Ethernet frames logging daemons
- *
- *	Authors:
- *	Bart De Schuymer <bdschuym@pandora.be>
- *	Harald Welte <laforge@netfilter.org>
- *
- *  November, 2004
- *
- * Based on ipt_ULOG.c, which is
- * (C) 2000-2002 by Harald Welte <laforge@netfilter.org>
- *
- * This module accepts two parameters:
- *
- * nlbufsiz:
- *   The parameter specifies how big the buffer for each netlink multicast
- * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will
- * get accumulated in the kernel until they are sent to userspace. It is
- * NOT possible to allocate more than 128kB, and it is strongly discouraged,
- * because atomically allocating 128kB inside the network rx softirq is not
- * reliable. Please also keep in mind that this buffer size is allocated for
- * each nlgroup you are using, so the total kernel memory usage increases
- * by that factor.
- *
- * flushtimeout:
- *   Specify, after how many hundredths of a second the queue should be
- *   flushed even if it is not full yet.
- *
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/socket.h>
-#include <linux/skbuff.h>
-#include <linux/kernel.h>
-#include <linux/timer.h>
-#include <net/netlink.h>
-#include <linux/netdevice.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter_bridge/ebtables.h>
-#include <linux/netfilter_bridge/ebt_ulog.h>
-#include <net/netfilter/nf_log.h>
-#include <net/netns/generic.h>
-#include <net/sock.h>
-#include "../br_private.h"
-
-static unsigned int nlbufsiz = NLMSG_GOODSIZE;
-module_param(nlbufsiz, uint, 0600);
-MODULE_PARM_DESC(nlbufsiz, "netlink buffer size (number of bytes) "
-			   "(defaults to 4096)");
-
-static unsigned int flushtimeout = 10;
-module_param(flushtimeout, uint, 0600);
-MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths ofa second) "
-			       "(defaults to 10)");
-
-typedef struct {
-	unsigned int qlen;		/* number of nlmsgs' in the skb */
-	struct nlmsghdr *lastnlh;	/* netlink header of last msg in skb */
-	struct sk_buff *skb;		/* the pre-allocated skb */
-	struct timer_list timer;	/* the timer function */
-	spinlock_t lock;		/* the per-queue lock */
-} ebt_ulog_buff_t;
-
-static int ebt_ulog_net_id __read_mostly;
-struct ebt_ulog_net {
-	unsigned int nlgroup[EBT_ULOG_MAXNLGROUPS];
-	ebt_ulog_buff_t ulog_buffers[EBT_ULOG_MAXNLGROUPS];
-	struct sock *ebtulognl;
-};
-
-static struct ebt_ulog_net *ebt_ulog_pernet(struct net *net)
-{
-	return net_generic(net, ebt_ulog_net_id);
-}
-
-/* send one ulog_buff_t to userspace */
-static void ulog_send(struct ebt_ulog_net *ebt, unsigned int nlgroup)
-{
-	ebt_ulog_buff_t *ub = &ebt->ulog_buffers[nlgroup];
-
-	del_timer(&ub->timer);
-
-	if (!ub->skb)
-		return;
-
-	/* last nlmsg needs NLMSG_DONE */
-	if (ub->qlen > 1)
-		ub->lastnlh->nlmsg_type = NLMSG_DONE;
-
-	NETLINK_CB(ub->skb).dst_group = nlgroup + 1;
-	netlink_broadcast(ebt->ebtulognl, ub->skb, 0, nlgroup + 1, GFP_ATOMIC);
-
-	ub->qlen = 0;
-	ub->skb = NULL;
-}
-
-/* timer function to flush queue in flushtimeout time */
-static void ulog_timer(unsigned long data)
-{
-	struct ebt_ulog_net *ebt = container_of((void *)data,
-						struct ebt_ulog_net,
-						nlgroup[*(unsigned int *)data]);
-
-	ebt_ulog_buff_t *ub = &ebt->ulog_buffers[*(unsigned int *)data];
-	spin_lock_bh(&ub->lock);
-	if (ub->skb)
-		ulog_send(ebt, *(unsigned int *)data);
-	spin_unlock_bh(&ub->lock);
-}
-
-static struct sk_buff *ulog_alloc_skb(unsigned int size)
-{
-	struct sk_buff *skb;
-	unsigned int n;
-
-	n = max(size, nlbufsiz);
-	skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN);
-	if (!skb) {
-		if (n > size) {
-			/* try to allocate only as much as we need for
-			 * current packet */
-			skb = alloc_skb(size, GFP_ATOMIC);
-			if (!skb)
-				pr_debug("cannot even allocate buffer of size %ub\n",
-					 size);
-		}
-	}
-
-	return skb;
-}
-
-static void ebt_ulog_packet(struct net *net, unsigned int hooknr,
-			    const struct sk_buff *skb,
-			    const struct net_device *in,
-			    const struct net_device *out,
-			    const struct ebt_ulog_info *uloginfo,
-			    const char *prefix)
-{
-	ebt_ulog_packet_msg_t *pm;
-	size_t size, copy_len;
-	struct nlmsghdr *nlh;
-	struct ebt_ulog_net *ebt = ebt_ulog_pernet(net);
-	unsigned int group = uloginfo->nlgroup;
-	ebt_ulog_buff_t *ub = &ebt->ulog_buffers[group];
-	spinlock_t *lock = &ub->lock;
-	ktime_t kt;
-
-	if ((uloginfo->cprange == 0) ||
-	    (uloginfo->cprange > skb->len + ETH_HLEN))
-		copy_len = skb->len + ETH_HLEN;
-	else
-		copy_len = uloginfo->cprange;
-
-	size = nlmsg_total_size(sizeof(*pm) + copy_len);
-	if (size > nlbufsiz) {
-		pr_debug("Size %Zd needed, but nlbufsiz=%d\n", size, nlbufsiz);
-		return;
-	}
-
-	spin_lock_bh(lock);
-
-	if (!ub->skb) {
-		if (!(ub->skb = ulog_alloc_skb(size)))
-			goto unlock;
-	} else if (size > skb_tailroom(ub->skb)) {
-		ulog_send(ebt, group);
-
-		if (!(ub->skb = ulog_alloc_skb(size)))
-			goto unlock;
-	}
-
-	nlh = nlmsg_put(ub->skb, 0, ub->qlen, 0,
-			size - NLMSG_ALIGN(sizeof(*nlh)), 0);
-	if (!nlh) {
-		kfree_skb(ub->skb);
-		ub->skb = NULL;
-		goto unlock;
-	}
-	ub->qlen++;
-
-	pm = nlmsg_data(nlh);
-	memset(pm, 0, sizeof(*pm));
-
-	/* Fill in the ulog data */
-	pm->version = EBT_ULOG_VERSION;
-	kt = ktime_get_real();
-	pm->stamp = ktime_to_timeval(kt);
-	if (ub->qlen == 1)
-		ub->skb->tstamp = kt;
-	pm->data_len = copy_len;
-	pm->mark = skb->mark;
-	pm->hook = hooknr;
-	if (uloginfo->prefix != NULL)
-		strcpy(pm->prefix, uloginfo->prefix);
-
-	if (in) {
-		strcpy(pm->physindev, in->name);
-		/* If in isn't a bridge, then physindev==indev */
-		if (br_port_exists(in))
-			/* rcu_read_lock()ed by nf_hook_slow */
-			strcpy(pm->indev, br_port_get_rcu(in)->br->dev->name);
-		else
-			strcpy(pm->indev, in->name);
-	}
-
-	if (out) {
-		/* If out exists, then out is a bridge port */
-		strcpy(pm->physoutdev, out->name);
-		/* rcu_read_lock()ed by nf_hook_slow */
-		strcpy(pm->outdev, br_port_get_rcu(out)->br->dev->name);
-	}
-
-	if (skb_copy_bits(skb, -ETH_HLEN, pm->data, copy_len) < 0)
-		BUG();
-
-	if (ub->qlen > 1)
-		ub->lastnlh->nlmsg_flags |= NLM_F_MULTI;
-
-	ub->lastnlh = nlh;
-
-	if (ub->qlen >= uloginfo->qthreshold)
-		ulog_send(ebt, group);
-	else if (!timer_pending(&ub->timer)) {
-		ub->timer.expires = jiffies + flushtimeout * HZ / 100;
-		add_timer(&ub->timer);
-	}
-
-unlock:
-	spin_unlock_bh(lock);
-}
-
-/* this function is registered with the netfilter core */
-static void ebt_log_packet(struct net *net, u_int8_t pf, unsigned int hooknum,
-   const struct sk_buff *skb, const struct net_device *in,
-   const struct net_device *out, const struct nf_loginfo *li,
-   const char *prefix)
-{
-	struct ebt_ulog_info loginfo;
-
-	if (!li || li->type != NF_LOG_TYPE_ULOG) {
-		loginfo.nlgroup = EBT_ULOG_DEFAULT_NLGROUP;
-		loginfo.cprange = 0;
-		loginfo.qthreshold = EBT_ULOG_DEFAULT_QTHRESHOLD;
-		loginfo.prefix[0] = '\0';
-	} else {
-		loginfo.nlgroup = li->u.ulog.group;
-		loginfo.cprange = li->u.ulog.copy_len;
-		loginfo.qthreshold = li->u.ulog.qthreshold;
-		strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix));
-	}
-
-	ebt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix);
-}
-
-static unsigned int
-ebt_ulog_tg(struct sk_buff *skb, const struct xt_action_param *par)
-{
-	struct net *net = dev_net(par->in ? par->in : par->out);
-
-	ebt_ulog_packet(net, par->hooknum, skb, par->in, par->out,
-	                par->targinfo, NULL);
-	return EBT_CONTINUE;
-}
-
-static int ebt_ulog_tg_check(const struct xt_tgchk_param *par)
-{
-	struct ebt_ulog_info *uloginfo = par->targinfo;
-
-	if (!par->net->xt.ebt_ulog_warn_deprecated) {
-		pr_info("ebt_ulog is deprecated and it will be removed soon, "
-			"use ebt_nflog instead\n");
-		par->net->xt.ebt_ulog_warn_deprecated = true;
-	}
-
-	if (uloginfo->nlgroup > 31)
-		return -EINVAL;
-
-	uloginfo->prefix[EBT_ULOG_PREFIX_LEN - 1] = '\0';
-
-	if (uloginfo->qthreshold > EBT_ULOG_MAX_QLEN)
-		uloginfo->qthreshold = EBT_ULOG_MAX_QLEN;
-
-	return 0;
-}
-
-static struct xt_target ebt_ulog_tg_reg __read_mostly = {
-	.name		= "ulog",
-	.revision	= 0,
-	.family		= NFPROTO_BRIDGE,
-	.target		= ebt_ulog_tg,
-	.checkentry	= ebt_ulog_tg_check,
-	.targetsize	= sizeof(struct ebt_ulog_info),
-	.me		= THIS_MODULE,
-};
-
-static struct nf_logger ebt_ulog_logger __read_mostly = {
-	.name		= "ebt_ulog",
-	.logfn		= &ebt_log_packet,
-	.me		= THIS_MODULE,
-};
-
-static int __net_init ebt_ulog_net_init(struct net *net)
-{
-	int i;
-	struct ebt_ulog_net *ebt = ebt_ulog_pernet(net);
-
-	struct netlink_kernel_cfg cfg = {
-		.groups	= EBT_ULOG_MAXNLGROUPS,
-	};
-
-	/* initialize ulog_buffers */
-	for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
-		ebt->nlgroup[i] = i;
-		setup_timer(&ebt->ulog_buffers[i].timer, ulog_timer,
-			    (unsigned long)&ebt->nlgroup[i]);
-		spin_lock_init(&ebt->ulog_buffers[i].lock);
-	}
-
-	ebt->ebtulognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg);
-	if (!ebt->ebtulognl)
-		return -ENOMEM;
-
-	nf_log_set(net, NFPROTO_BRIDGE, &ebt_ulog_logger);
-	return 0;
-}
-
-static void __net_exit ebt_ulog_net_fini(struct net *net)
-{
-	int i;
-	struct ebt_ulog_net *ebt = ebt_ulog_pernet(net);
-
-	nf_log_unset(net, &ebt_ulog_logger);
-	for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
-		ebt_ulog_buff_t *ub = &ebt->ulog_buffers[i];
-		del_timer(&ub->timer);
-
-		if (ub->skb) {
-			kfree_skb(ub->skb);
-			ub->skb = NULL;
-		}
-	}
-	netlink_kernel_release(ebt->ebtulognl);
-}
-
-static struct pernet_operations ebt_ulog_net_ops = {
-	.init = ebt_ulog_net_init,
-	.exit = ebt_ulog_net_fini,
-	.id   = &ebt_ulog_net_id,
-	.size = sizeof(struct ebt_ulog_net),
-};
-
-static int __init ebt_ulog_init(void)
-{
-	int ret;
-
-	if (nlbufsiz >= 128*1024) {
-		pr_warn("Netlink buffer has to be <= 128kB,"
-			"please try a smaller nlbufsiz parameter.\n");
-		return -EINVAL;
-	}
-
-	ret = register_pernet_subsys(&ebt_ulog_net_ops);
-	if (ret)
-		goto out_pernet;
-
-	ret = xt_register_target(&ebt_ulog_tg_reg);
-	if (ret)
-		goto out_target;
-
-	nf_log_register(NFPROTO_BRIDGE, &ebt_ulog_logger);
-
-	return 0;
-
-out_target:
-	unregister_pernet_subsys(&ebt_ulog_net_ops);
-out_pernet:
-	return ret;
-}
-
-static void __exit ebt_ulog_fini(void)
-{
-	nf_log_unregister(&ebt_ulog_logger);
-	xt_unregister_target(&ebt_ulog_tg_reg);
-	unregister_pernet_subsys(&ebt_ulog_net_ops);
-}
-
-module_init(ebt_ulog_init);
-module_exit(ebt_ulog_fini);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
-MODULE_DESCRIPTION("Ebtables: Packet logging to netlink using ULOG");

net/ipv4/netfilter/Kconfig

@@ -159,25 +159,6 @@ config IP_NF_TARGET_SYNPROXY
 
 	  To compile it as a module, choose M here. If unsure, say N.
 
-config IP_NF_TARGET_ULOG
-	tristate "ULOG target support (obsolete)"
-	default m if NETFILTER_ADVANCED=n
-	---help---
-
-	  This option enables the old IPv4-only "ipt_ULOG" implementation
-	  which has been obsoleted by the new "nfnetlink_log" code (see
-	  CONFIG_NETFILTER_NETLINK_LOG).
-
-	  This option adds a `ULOG' target, which allows you to create rules in
-	  any iptables table. The packet is passed to a userspace logging
-	  daemon using netlink multicast sockets; unlike the LOG target
-	  which can only be viewed through syslog.
-
-	  The appropriate userspace logging daemon (ulogd) may be obtained from
-	  <http://www.netfilter.org/projects/ulogd/index.html>
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 # NAT + specific targets: nf_conntrack
 config NF_NAT_IPV4
 	tristate "IPv4 NAT"

net/ipv4/netfilter/ipt_ULOG.c

@@ -1,498 +0,0 @@
-/*
- * netfilter module for userspace packet logging daemons
- *
- * (C) 2000-2004 by Harald Welte <laforge@netfilter.org>
- * (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- * (C) 2005-2007 Patrick McHardy <kaber@trash.net>
- *
- * 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.
- *
- * This module accepts two parameters:
- *
- * nlbufsiz:
- *   The parameter specifies how big the buffer for each netlink multicast
- * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will
- * get accumulated in the kernel until they are sent to userspace. It is
- * NOT possible to allocate more than 128kB, and it is strongly discouraged,
- * because atomically allocating 128kB inside the network rx softirq is not
- * reliable. Please also keep in mind that this buffer size is allocated for
- * each nlgroup you are using, so the total kernel memory usage increases
- * by that factor.
- *
- * Actually you should use nlbufsiz a bit smaller than PAGE_SIZE, since
- * nlbufsiz is used with alloc_skb, which adds another
- * sizeof(struct skb_shared_info).  Use NLMSG_GOODSIZE instead.
- *
- * flushtimeout:
- *   Specify, after how many hundredths of a second the queue should be
- *   flushed even if it is not full yet.
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/socket.h>
-#include <linux/slab.h>
-#include <linux/skbuff.h>
-#include <linux/kernel.h>
-#include <linux/timer.h>
-#include <net/netlink.h>
-#include <linux/netdevice.h>
-#include <linux/mm.h>
-#include <linux/moduleparam.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter_ipv4/ipt_ULOG.h>
-#include <net/netfilter/nf_log.h>
-#include <net/netns/generic.h>
-#include <net/sock.h>
-#include <linux/bitops.h>
-#include <asm/unaligned.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
-MODULE_DESCRIPTION("Xtables: packet logging to netlink using ULOG");
-MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NFLOG);
-
-#define ULOG_NL_EVENT		111		/* Harald's favorite number */
-#define ULOG_MAXNLGROUPS	32		/* numer of nlgroups */
-
-static unsigned int nlbufsiz = NLMSG_GOODSIZE;
-module_param(nlbufsiz, uint, 0400);
-MODULE_PARM_DESC(nlbufsiz, "netlink buffer size");
-
-static unsigned int flushtimeout = 10;
-module_param(flushtimeout, uint, 0600);
-MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths of a second)");
-
-static bool nflog = true;
-module_param(nflog, bool, 0400);
-MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
-
-/* global data structures */
-
-typedef struct {
-	unsigned int qlen;		/* number of nlmsgs' in the skb */
-	struct nlmsghdr *lastnlh;	/* netlink header of last msg in skb */
-	struct sk_buff *skb;		/* the pre-allocated skb */
-	struct timer_list timer;	/* the timer function */
-} ulog_buff_t;
-
-static int ulog_net_id __read_mostly;
-struct ulog_net {
-	unsigned int nlgroup[ULOG_MAXNLGROUPS];
-	ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS];
-	struct sock *nflognl;
-	spinlock_t lock;
-};
-
-static struct ulog_net *ulog_pernet(struct net *net)
-{
-	return net_generic(net, ulog_net_id);
-}
-
-/* send one ulog_buff_t to userspace */
-static void ulog_send(struct ulog_net *ulog, unsigned int nlgroupnum)
-{
-	ulog_buff_t *ub = &ulog->ulog_buffers[nlgroupnum];
-
-	pr_debug("ulog_send: timer is deleting\n");
-	del_timer(&ub->timer);
-
-	if (!ub->skb) {
-		pr_debug("ulog_send: nothing to send\n");
-		return;
-	}
-
-	/* last nlmsg needs NLMSG_DONE */
-	if (ub->qlen > 1)
-		ub->lastnlh->nlmsg_type = NLMSG_DONE;
-
-	NETLINK_CB(ub->skb).dst_group = nlgroupnum + 1;
-	pr_debug("throwing %d packets to netlink group %u\n",
-		 ub->qlen, nlgroupnum + 1);
-	netlink_broadcast(ulog->nflognl, ub->skb, 0, nlgroupnum + 1,
-			  GFP_ATOMIC);
-
-	ub->qlen = 0;
-	ub->skb = NULL;
-	ub->lastnlh = NULL;
-}
-
-
-/* timer function to flush queue in flushtimeout time */
-static void ulog_timer(unsigned long data)
-{
-	unsigned int groupnum = *((unsigned int *)data);
-	struct ulog_net *ulog = container_of((void *)data,
-					     struct ulog_net,
-					     nlgroup[groupnum]);
-	pr_debug("timer function called, calling ulog_send\n");
-
-	/* lock to protect against somebody modifying our structure
-	 * from ipt_ulog_target at the same time */
-	spin_lock_bh(&ulog->lock);
-	ulog_send(ulog, groupnum);
-	spin_unlock_bh(&ulog->lock);
-}
-
-static struct sk_buff *ulog_alloc_skb(unsigned int size)
-{
-	struct sk_buff *skb;
-	unsigned int n;
-
-	/* alloc skb which should be big enough for a whole
-	 * multipart message. WARNING: has to be <= 131000
-	 * due to slab allocator restrictions */
-
-	n = max(size, nlbufsiz);
-	skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN);
-	if (!skb) {
-		if (n > size) {
-			/* try to allocate only as much as we need for
-			 * current packet */
-
-			skb = alloc_skb(size, GFP_ATOMIC);
-			if (!skb)
-				pr_debug("cannot even allocate %ub\n", size);
-		}
-	}
-
-	return skb;
-}
-
-static void ipt_ulog_packet(struct net *net,
-			    unsigned int hooknum,
-			    const struct sk_buff *skb,
-			    const struct net_device *in,
-			    const struct net_device *out,
-			    const struct ipt_ulog_info *loginfo,
-			    const char *prefix)
-{
-	ulog_buff_t *ub;
-	ulog_packet_msg_t *pm;
-	size_t size, copy_len;
-	struct nlmsghdr *nlh;
-	struct timeval tv;
-	struct ulog_net *ulog = ulog_pernet(net);
-
-	/* ffs == find first bit set, necessary because userspace
-	 * is already shifting groupnumber, but we need unshifted.
-	 * ffs() returns [1..32], we need [0..31] */
-	unsigned int groupnum = ffs(loginfo->nl_group) - 1;
-
-	/* calculate the size of the skb needed */
-	if (loginfo->copy_range == 0 || loginfo->copy_range > skb->len)
-		copy_len = skb->len;
-	else
-		copy_len = loginfo->copy_range;
-
-	size = nlmsg_total_size(sizeof(*pm) + copy_len);
-
-	ub = &ulog->ulog_buffers[groupnum];
-
-	spin_lock_bh(&ulog->lock);
-
-	if (!ub->skb) {
-		if (!(ub->skb = ulog_alloc_skb(size)))
-			goto alloc_failure;
-	} else if (ub->qlen >= loginfo->qthreshold ||
-		   size > skb_tailroom(ub->skb)) {
-		/* either the queue len is too high or we don't have
-		 * enough room in nlskb left. send it to userspace. */
-
-		ulog_send(ulog, groupnum);
-
-		if (!(ub->skb = ulog_alloc_skb(size)))
-			goto alloc_failure;
-	}
-
-	pr_debug("qlen %d, qthreshold %Zu\n", ub->qlen, loginfo->qthreshold);
-
-	nlh = nlmsg_put(ub->skb, 0, ub->qlen, ULOG_NL_EVENT,
-			sizeof(*pm)+copy_len, 0);
-	if (!nlh) {
-		pr_debug("error during nlmsg_put\n");
-		goto out_unlock;
-	}
-	ub->qlen++;
-
-	pm = nlmsg_data(nlh);
-	memset(pm, 0, sizeof(*pm));
-
-	/* We might not have a timestamp, get one */
-	if (skb->tstamp.tv64 == 0)
-		__net_timestamp((struct sk_buff *)skb);
-
-	/* copy hook, prefix, timestamp, payload, etc. */
-	pm->data_len = copy_len;
-	tv = ktime_to_timeval(skb->tstamp);
-	put_unaligned(tv.tv_sec, &pm->timestamp_sec);
-	put_unaligned(tv.tv_usec, &pm->timestamp_usec);
-	put_unaligned(skb->mark, &pm->mark);
-	pm->hook = hooknum;
-	if (prefix != NULL) {
-		strncpy(pm->prefix, prefix, sizeof(pm->prefix) - 1);
-		pm->prefix[sizeof(pm->prefix) - 1] = '\0';
-	}
-	else if (loginfo->prefix[0] != '\0')
-		strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix));
-
-	if (in && in->hard_header_len > 0 &&
-	    skb->mac_header != skb->network_header &&
-	    in->hard_header_len <= ULOG_MAC_LEN) {
-		memcpy(pm->mac, skb_mac_header(skb), in->hard_header_len);
-		pm->mac_len = in->hard_header_len;
-	} else
-		pm->mac_len = 0;
-
-	if (in)
-		strncpy(pm->indev_name, in->name, sizeof(pm->indev_name));
-
-	if (out)
-		strncpy(pm->outdev_name, out->name, sizeof(pm->outdev_name));
-
-	/* copy_len <= skb->len, so can't fail. */
-	if (skb_copy_bits(skb, 0, pm->payload, copy_len) < 0)
-		BUG();
-
-	/* check if we are building multi-part messages */
-	if (ub->qlen > 1)
-		ub->lastnlh->nlmsg_flags |= NLM_F_MULTI;
-
-	ub->lastnlh = nlh;
-
-	/* if timer isn't already running, start it */
-	if (!timer_pending(&ub->timer)) {
-		ub->timer.expires = jiffies + flushtimeout * HZ / 100;
-		add_timer(&ub->timer);
-	}
-
-	/* if threshold is reached, send message to userspace */
-	if (ub->qlen >= loginfo->qthreshold) {
-		if (loginfo->qthreshold > 1)
-			nlh->nlmsg_type = NLMSG_DONE;
-		ulog_send(ulog, groupnum);
-	}
-out_unlock:
-	spin_unlock_bh(&ulog->lock);
-
-	return;
-
-alloc_failure:
-	pr_debug("Error building netlink message\n");
-	spin_unlock_bh(&ulog->lock);
-}
-
-static unsigned int
-ulog_tg(struct sk_buff *skb, const struct xt_action_param *par)
-{
-	struct net *net = dev_net(par->in ? par->in : par->out);
-
-	ipt_ulog_packet(net, par->hooknum, skb, par->in, par->out,
-	                par->targinfo, NULL);
-	return XT_CONTINUE;
-}
-
-static void ipt_logfn(struct net *net,
-		      u_int8_t pf,
-		      unsigned int hooknum,
-		      const struct sk_buff *skb,
-		      const struct net_device *in,
-		      const struct net_device *out,
-		      const struct nf_loginfo *li,
-		      const char *prefix)
-{
-	struct ipt_ulog_info loginfo;
-
-	if (!li || li->type != NF_LOG_TYPE_ULOG) {
-		loginfo.nl_group = ULOG_DEFAULT_NLGROUP;
-		loginfo.copy_range = 0;
-		loginfo.qthreshold = ULOG_DEFAULT_QTHRESHOLD;
-		loginfo.prefix[0] = '\0';
-	} else {
-		loginfo.nl_group = li->u.ulog.group;
-		loginfo.copy_range = li->u.ulog.copy_len;
-		loginfo.qthreshold = li->u.ulog.qthreshold;
-		strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix));
-	}
-
-	ipt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix);
-}
-
-static int ulog_tg_check(const struct xt_tgchk_param *par)
-{
-	const struct ipt_ulog_info *loginfo = par->targinfo;
-
-	if (!par->net->xt.ulog_warn_deprecated) {
-		pr_info("ULOG is deprecated and it will be removed soon, "
-			"use NFLOG instead\n");
-		par->net->xt.ulog_warn_deprecated = true;
-	}
-
-	if (loginfo->prefix[sizeof(loginfo->prefix) - 1] != '\0') {
-		pr_debug("prefix not null-terminated\n");
-		return -EINVAL;
-	}
-	if (loginfo->qthreshold > ULOG_MAX_QLEN) {
-		pr_debug("queue threshold %Zu > MAX_QLEN\n",
-			 loginfo->qthreshold);
-		return -EINVAL;
-	}
-	return 0;
-}
-
-#ifdef CONFIG_COMPAT
-struct compat_ipt_ulog_info {
-	compat_uint_t	nl_group;
-	compat_size_t	copy_range;
-	compat_size_t	qthreshold;
-	char		prefix[ULOG_PREFIX_LEN];
-};
-
-static void ulog_tg_compat_from_user(void *dst, const void *src)
-{
-	const struct compat_ipt_ulog_info *cl = src;
-	struct ipt_ulog_info l = {
-		.nl_group	= cl->nl_group,
-		.copy_range	= cl->copy_range,
-		.qthreshold	= cl->qthreshold,
-	};
-
-	memcpy(l.prefix, cl->prefix, sizeof(l.prefix));
-	memcpy(dst, &l, sizeof(l));
-}
-
-static int ulog_tg_compat_to_user(void __user *dst, const void *src)
-{
-	const struct ipt_ulog_info *l = src;
-	struct compat_ipt_ulog_info cl = {
-		.nl_group	= l->nl_group,
-		.copy_range	= l->copy_range,
-		.qthreshold	= l->qthreshold,
-	};
-
-	memcpy(cl.prefix, l->prefix, sizeof(cl.prefix));
-	return copy_to_user(dst, &cl, sizeof(cl)) ? -EFAULT : 0;
-}
-#endif /* CONFIG_COMPAT */
-
-static struct xt_target ulog_tg_reg __read_mostly = {
-	.name		= "ULOG",
-	.family		= NFPROTO_IPV4,
-	.target		= ulog_tg,
-	.targetsize	= sizeof(struct ipt_ulog_info),
-	.checkentry	= ulog_tg_check,
-#ifdef CONFIG_COMPAT
-	.compatsize	= sizeof(struct compat_ipt_ulog_info),
-	.compat_from_user = ulog_tg_compat_from_user,
-	.compat_to_user	= ulog_tg_compat_to_user,
-#endif
-	.me		= THIS_MODULE,
-};
-
-static struct nf_logger ipt_ulog_logger __read_mostly = {
-	.name		= "ipt_ULOG",
-	.logfn		= ipt_logfn,
-	.me		= THIS_MODULE,
-};
-
-static int __net_init ulog_tg_net_init(struct net *net)
-{
-	int i;
-	struct ulog_net *ulog = ulog_pernet(net);
-	struct netlink_kernel_cfg cfg = {
-		.groups	= ULOG_MAXNLGROUPS,
-	};
-
-	spin_lock_init(&ulog->lock);
-	/* initialize ulog_buffers */
-	for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
-		ulog->nlgroup[i] = i;
-		setup_timer(&ulog->ulog_buffers[i].timer, ulog_timer,
-			    (unsigned long)&ulog->nlgroup[i]);
-	}
-
-	ulog->nflognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg);
-	if (!ulog->nflognl)
-		return -ENOMEM;
-
-	if (nflog)
-		nf_log_set(net, NFPROTO_IPV4, &ipt_ulog_logger);
-
-	return 0;
-}
-
-static void __net_exit ulog_tg_net_exit(struct net *net)
-{
-	ulog_buff_t *ub;
-	int i;
-	struct ulog_net *ulog = ulog_pernet(net);
-
-	if (nflog)
-		nf_log_unset(net, &ipt_ulog_logger);
-
-	netlink_kernel_release(ulog->nflognl);
-
-	/* remove pending timers and free allocated skb's */
-	for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
-		ub = &ulog->ulog_buffers[i];
-		pr_debug("timer is deleting\n");
-		del_timer(&ub->timer);
-
-		if (ub->skb) {
-			kfree_skb(ub->skb);
-			ub->skb = NULL;
-		}
-	}
-}
-
-static struct pernet_operations ulog_tg_net_ops = {
-	.init = ulog_tg_net_init,
-	.exit = ulog_tg_net_exit,
-	.id   = &ulog_net_id,
-	.size = sizeof(struct ulog_net),
-};
-
-static int __init ulog_tg_init(void)
-{
-	int ret;
-	pr_debug("init module\n");
-
-	if (nlbufsiz > 128*1024) {
-		pr_warn("Netlink buffer has to be <= 128kB\n");
-		return -EINVAL;
-	}
-
-	ret = register_pernet_subsys(&ulog_tg_net_ops);
-	if (ret)
-		goto out_pernet;
-
-	ret = xt_register_target(&ulog_tg_reg);
-	if (ret < 0)
-		goto out_target;
-
-	if (nflog)
-		nf_log_register(NFPROTO_IPV4, &ipt_ulog_logger);
-
-	return 0;
-
-out_target:
-	unregister_pernet_subsys(&ulog_tg_net_ops);
-out_pernet:
-	return ret;
-}
-
-static void __exit ulog_tg_exit(void)
-{
-	pr_debug("cleanup_module\n");
-	if (nflog)
-		nf_log_unregister(&ipt_ulog_logger);
-	xt_unregister_target(&ulog_tg_reg);
-	unregister_pernet_subsys(&ulog_tg_net_ops);
-}
-
-module_init(ulog_tg_init);
-module_exit(ulog_tg_exit);