[linux-block.git] / net / bridge / netfilter / ebt_ulog.c

/*
 * 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.
 *
 */

#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 <linux/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/sock.h>
#include "../br_private.h"

#define PRINTR(format, args...) do { if (net_ratelimit()) \
				printk(format , ## args); } while (0)

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 ebt_ulog_buff_t ulog_buffers[EBT_ULOG_MAXNLGROUPS];
static struct sock *ebtulognl;

/* send one ulog_buff_t to userspace */
static void ulog_send(unsigned int nlgroup)
{
	ebt_ulog_buff_t *ub = &ulog_buffers[nlgroup];

	if (timer_pending(&ub->timer))
		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(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)
{
	spin_lock_bh(&ulog_buffers[data].lock);
	if (ulog_buffers[data].skb)
		ulog_send(data);
	spin_unlock_bh(&ulog_buffers[data].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);
	if (!skb) {
		PRINTR(KERN_ERR "ebt_ulog: can't alloc whole buffer "
		       "of size %ub!\n", n);
		if (n > size) {
			/* try to allocate only as much as we need for
			 * current packet */
			skb = alloc_skb(size, GFP_ATOMIC);
			if (!skb)
				PRINTR(KERN_ERR "ebt_ulog: can't even allocate "
				       "buffer of size %ub\n", size);
		}
	}

	return skb;
}

static void ebt_ulog_packet(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;
	unsigned int group = uloginfo->nlgroup;
	ebt_ulog_buff_t *ub = &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_SPACE(sizeof(*pm) + copy_len);
	if (size > nlbufsiz) {
		PRINTR("ebt_ulog: 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 alloc_failure;
	} else if (size > skb_tailroom(ub->skb)) {
		ulog_send(group);

		if (!(ub->skb = ulog_alloc_skb(size)))
			goto alloc_failure;
	}

	nlh = NLMSG_PUT(ub->skb, 0, ub->qlen, 0,
			size - NLMSG_ALIGN(sizeof(*nlh)));
	ub->qlen++;

	pm = NLMSG_DATA(nlh);

	/* 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);
	else
		*(pm->prefix) = '\0';

	if (in) {
		strcpy(pm->physindev, in->name);
		/* If in isn't a bridge, then physindev==indev */
		if (in->br_port)
			strcpy(pm->indev, in->br_port->br->dev->name);
		else
			strcpy(pm->indev, in->name);
	} else
		pm->indev[0] = pm->physindev[0] = '\0';

	if (out) {
		/* If out exists, then out is a bridge port */
		strcpy(pm->physoutdev, out->name);
		strcpy(pm->outdev, out->br_port->br->dev->name);
	} else
		pm->outdev[0] = pm->physoutdev[0] = '\0';

	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(group);
	else if (!timer_pending(&ub->timer)) {
		ub->timer.expires = jiffies + flushtimeout * HZ / 100;
		add_timer(&ub->timer);
	}

unlock:
	spin_unlock_bh(lock);

	return;

nlmsg_failure:
	printk(KERN_CRIT "ebt_ulog: error during NLMSG_PUT. This should "
	       "not happen, please report to author.\n");
	goto unlock;
alloc_failure:
	goto unlock;
}

/* this function is registered with the netfilter core */
static void ebt_log_packet(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(hooknum, skb, in, out, &loginfo, prefix);
}

static unsigned int
ebt_ulog_tg(struct sk_buff *skb, const struct xt_target_param *par)
{
	ebt_ulog_packet(par->hooknum, skb, par->in, par->out,
	                par->targinfo, NULL);
	return EBT_CONTINUE;
}

static bool ebt_ulog_tg_check(const struct xt_tgchk_param *par)
{
	struct ebt_ulog_info *uloginfo = par->targinfo;

	if (uloginfo->nlgroup > 31)
		return false;

	uloginfo->prefix[EBT_ULOG_PREFIX_LEN - 1] = '\0';

	if (uloginfo->qthreshold > EBT_ULOG_MAX_QLEN)
		uloginfo->qthreshold = EBT_ULOG_MAX_QLEN;

	return true;
}

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 __init ebt_ulog_init(void)
{
	int ret;
	int i;

	if (nlbufsiz >= 128*1024) {
		printk(KERN_NOTICE "ebt_ulog: Netlink buffer has to be <= 128kB,"
		       " please try a smaller nlbufsiz parameter.\n");
		return -EINVAL;
	}

	/* initialize ulog_buffers */
	for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
		setup_timer(&ulog_buffers[i].timer, ulog_timer, i);
		spin_lock_init(&ulog_buffers[i].lock);
	}

	ebtulognl = netlink_kernel_create(&init_net, NETLINK_NFLOG,
					  EBT_ULOG_MAXNLGROUPS, NULL, NULL,
					  THIS_MODULE);
	if (!ebtulognl) {
		printk(KERN_WARNING KBUILD_MODNAME ": out of memory trying to "
		       "call netlink_kernel_create\n");
		ret = -ENOMEM;
	} else if ((ret = xt_register_target(&ebt_ulog_tg_reg)) != 0) {
		netlink_kernel_release(ebtulognl);
	}

	if (ret == 0)
		nf_log_register(NFPROTO_BRIDGE, &ebt_ulog_logger);

	return ret;
}

static void __exit ebt_ulog_fini(void)
{
	ebt_ulog_buff_t *ub;
	int i;

	nf_log_unregister(&ebt_ulog_logger);
	xt_unregister_target(&ebt_ulog_tg_reg);
	for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
		ub = &ulog_buffers[i];
		if (timer_pending(&ub->timer))
			del_timer(&ub->timer);
		spin_lock_bh(&ub->lock);
		if (ub->skb) {
			kfree_skb(ub->skb);
			ub->skb = NULL;
		}
		spin_unlock_bh(&ub->lock);
	}
	netlink_kernel_release(ebtulognl);
}

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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* netfilter module for userspace bridged Ethernet frames logging daemons
	3	*
	4	* Authors:
	5	* Bart De Schuymer <bdschuym@pandora.be>
d5228a4f	6	* Harald Welte <laforge@netfilter.org>
1da177e4 LT	7	*
	8	* November, 2004
	9	*
	10	* Based on ipt_ULOG.c, which is
	11	* (C) 2000-2002 by Harald Welte <laforge@netfilter.org>
	12	*
9d6f229f YH	13	* This module accepts two parameters:
9d6f229f YH	14	*
1da177e4 LT	15	* nlbufsiz:
	16	* The parameter specifies how big the buffer for each netlink multicast
	17	* group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will
	18	* get accumulated in the kernel until they are sent to userspace. It is
	19	* NOT possible to allocate more than 128kB, and it is strongly discouraged,
	20	* because atomically allocating 128kB inside the network rx softirq is not
	21	* reliable. Please also keep in mind that this buffer size is allocated for
	22	* each nlgroup you are using, so the total kernel memory usage increases
	23	* by that factor.
	24	*
	25	* flushtimeout:
	26	* Specify, after how many hundredths of a second the queue should be
	27	* flushed even if it is not full yet.
	28	*
	29	*/
	30
	31	#include <linux/module.h>
5a0e3ad6	32	#include <linux/slab.h>
1da177e4 LT	33	#include <linux/spinlock.h>
	34	#include <linux/socket.h>
	35	#include <linux/skbuff.h>
	36	#include <linux/kernel.h>
	37	#include <linux/timer.h>
	38	#include <linux/netlink.h>
	39	#include <linux/netdevice.h>
18219d3f	40	#include <linux/netfilter/x_tables.h>
1da177e4 LT	41	#include <linux/netfilter_bridge/ebtables.h>
1da177e4 LT	42	#include <linux/netfilter_bridge/ebt_ulog.h>
f01ffbd6	43	#include <net/netfilter/nf_log.h>
1da177e4 LT	44	#include <net/sock.h>
	45	#include "../br_private.h"
	46
	47	#define PRINTR(format, args...) do { if (net_ratelimit()) \
9d6f229f	48	printk(format , ## args); } while (0)
1da177e4	49
c2db2924	50	static unsigned int nlbufsiz = NLMSG_GOODSIZE;
1da177e4 LT	51	module_param(nlbufsiz, uint, 0600);
1da177e4 LT	52	MODULE_PARM_DESC(nlbufsiz, "netlink buffer size (number of bytes) "
9d6f229f	53	"(defaults to 4096)");
1da177e4 LT	54
	55	static unsigned int flushtimeout = 10;
	56	module_param(flushtimeout, uint, 0600);
	57	MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths ofa second) "
9d6f229f	58	"(defaults to 10)");
1da177e4 LT	59
	60	typedef struct {
	61	unsigned int qlen; /* number of nlmsgs' in the skb */
	62	struct nlmsghdr lastnlh; / netlink header of last msg in skb */
	63	struct sk_buff skb; / the pre-allocated skb */
	64	struct timer_list timer; /* the timer function */
	65	spinlock_t lock; /* the per-queue lock */
	66	} ebt_ulog_buff_t;
	67
	68	static ebt_ulog_buff_t ulog_buffers[EBT_ULOG_MAXNLGROUPS];
	69	static struct sock *ebtulognl;
	70
	71	/* send one ulog_buff_t to userspace */
	72	static void ulog_send(unsigned int nlgroup)
	73	{
	74	ebt_ulog_buff_t *ub = &ulog_buffers[nlgroup];
	75
	76	if (timer_pending(&ub->timer))
	77	del_timer(&ub->timer);
	78
dcb7cd97 MH	79	if (!ub->skb)
	80	return;
	81
1da177e4 LT	82	/* last nlmsg needs NLMSG_DONE */
	83	if (ub->qlen > 1)
	84	ub->lastnlh->nlmsg_type = NLMSG_DONE;
	85
ac6d439d PM	86	NETLINK_CB(ub->skb).dst_group = nlgroup + 1;
ac6d439d PM	87	netlink_broadcast(ebtulognl, ub->skb, 0, nlgroup + 1, GFP_ATOMIC);
1da177e4 LT	88
	89	ub->qlen = 0;
	90	ub->skb = NULL;
	91	}
	92
	93	/* timer function to flush queue in flushtimeout time */
	94	static void ulog_timer(unsigned long data)
	95	{
	96	spin_lock_bh(&ulog_buffers[data].lock);
	97	if (ulog_buffers[data].skb)
	98	ulog_send(data);
	99	spin_unlock_bh(&ulog_buffers[data].lock);
	100	}
	101
	102	static struct sk_buff *ulog_alloc_skb(unsigned int size)
	103	{
	104	struct sk_buff *skb;
ad2ad0f9	105	unsigned int n;
1da177e4	106
ad2ad0f9 PM	107	n = max(size, nlbufsiz);
ad2ad0f9 PM	108	skb = alloc_skb(n, GFP_ATOMIC);
1da177e4 LT	109	if (!skb) {
1da177e4 LT	110	PRINTR(KERN_ERR "ebt_ulog: can't alloc whole buffer "
ad2ad0f9 PM	111	"of size %ub!\n", n);
ad2ad0f9 PM	112	if (n > size) {
1da177e4 LT	113	/* try to allocate only as much as we need for
	114	* current packet */
	115	skb = alloc_skb(size, GFP_ATOMIC);
	116	if (!skb)
	117	PRINTR(KERN_ERR "ebt_ulog: can't even allocate "
	118	"buffer of size %ub\n", size);
	119	}
	120	}
	121
	122	return skb;
	123	}
	124
d5228a4f	125	static void ebt_ulog_packet(unsigned int hooknr, const struct sk_buff *skb,
1da177e4	126	const struct net_device in, const struct net_device out,
d5228a4f	127	const struct ebt_ulog_info uloginfo, const char prefix)
1da177e4 LT	128	{
	129	ebt_ulog_packet_msg_t *pm;
	130	size_t size, copy_len;
	131	struct nlmsghdr *nlh;
1da177e4 LT	132	unsigned int group = uloginfo->nlgroup;
	133	ebt_ulog_buff_t *ub = &ulog_buffers[group];
	134	spinlock_t *lock = &ub->lock;
b7aa0bf7	135	ktime_t kt;
1da177e4 LT	136
	137	if ((uloginfo->cprange == 0) \|\|
	138	(uloginfo->cprange > skb->len + ETH_HLEN))
	139	copy_len = skb->len + ETH_HLEN;
	140	else
	141	copy_len = uloginfo->cprange;
	142
	143	size = NLMSG_SPACE(sizeof(*pm) + copy_len);
	144	if (size > nlbufsiz) {
	145	PRINTR("ebt_ulog: Size %Zd needed, but nlbufsiz=%d\n",
	146	size, nlbufsiz);
	147	return;
	148	}
	149
	150	spin_lock_bh(lock);
	151
	152	if (!ub->skb) {
	153	if (!(ub->skb = ulog_alloc_skb(size)))
	154	goto alloc_failure;
	155	} else if (size > skb_tailroom(ub->skb)) {
	156	ulog_send(group);
	157
	158	if (!(ub->skb = ulog_alloc_skb(size)))
	159	goto alloc_failure;
	160	}
	161
	162	nlh = NLMSG_PUT(ub->skb, 0, ub->qlen, 0,
9d6f229f	163	size - NLMSG_ALIGN(sizeof(*nlh)));
1da177e4 LT	164	ub->qlen++;
	165
	166	pm = NLMSG_DATA(nlh);
	167
	168	/* Fill in the ulog data */
	169	pm->version = EBT_ULOG_VERSION;
b7aa0bf7 ED	170	kt = ktime_get_real();
b7aa0bf7 ED	171	pm->stamp = ktime_to_timeval(kt);
1da177e4	172	if (ub->qlen == 1)
b7aa0bf7	173	ub->skb->tstamp = kt;
1da177e4	174	pm->data_len = copy_len;
82e91ffe	175	pm->mark = skb->mark;
1da177e4 LT	176	pm->hook = hooknr;
	177	if (uloginfo->prefix != NULL)
	178	strcpy(pm->prefix, uloginfo->prefix);
	179	else
	180	*(pm->prefix) = '\0';
	181
	182	if (in) {
	183	strcpy(pm->physindev, in->name);
	184	/* If in isn't a bridge, then physindev==indev */
	185	if (in->br_port)
	186	strcpy(pm->indev, in->br_port->br->dev->name);
	187	else
	188	strcpy(pm->indev, in->name);
	189	} else
	190	pm->indev[0] = pm->physindev[0] = '\0';
	191
	192	if (out) {
	193	/* If out exists, then out is a bridge port */
	194	strcpy(pm->physoutdev, out->name);
	195	strcpy(pm->outdev, out->br_port->br->dev->name);
	196	} else
	197	pm->outdev[0] = pm->physoutdev[0] = '\0';
	198
	199	if (skb_copy_bits(skb, -ETH_HLEN, pm->data, copy_len) < 0)
	200	BUG();
	201
	202	if (ub->qlen > 1)
	203	ub->lastnlh->nlmsg_flags \|= NLM_F_MULTI;
	204
	205	ub->lastnlh = nlh;
	206
	207	if (ub->qlen >= uloginfo->qthreshold)
	208	ulog_send(group);
	209	else if (!timer_pending(&ub->timer)) {
	210	ub->timer.expires = jiffies + flushtimeout * HZ / 100;
	211	add_timer(&ub->timer);
	212	}
	213
	214	unlock:
	215	spin_unlock_bh(lock);
	216
	217	return;
	218
	219	nlmsg_failure:
	220	printk(KERN_CRIT "ebt_ulog: error during NLMSG_PUT. This should "
	221	"not happen, please report to author.\n");
	222	goto unlock;
	223	alloc_failure:
	224	goto unlock;
	225	}
	226
d5228a4f	227	/* this function is registered with the netfilter core */
76108cea	228	static void ebt_log_packet(u_int8_t pf, unsigned int hooknum,
d5228a4f BDS	229	const struct sk_buff skb, const struct net_device in,
	230	const struct net_device out, const struct nf_loginfo li,
	231	const char *prefix)
	232	{
	233	struct ebt_ulog_info loginfo;
	234
	235	if (!li \|\| li->type != NF_LOG_TYPE_ULOG) {
	236	loginfo.nlgroup = EBT_ULOG_DEFAULT_NLGROUP;
	237	loginfo.cprange = 0;
	238	loginfo.qthreshold = EBT_ULOG_DEFAULT_QTHRESHOLD;
	239	loginfo.prefix[0] = '\0';
	240	} else {
	241	loginfo.nlgroup = li->u.ulog.group;
	242	loginfo.cprange = li->u.ulog.copy_len;
	243	loginfo.qthreshold = li->u.ulog.qthreshold;
	244	strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix));
	245	}
	246
	247	ebt_ulog_packet(hooknum, skb, in, out, &loginfo, prefix);
	248	}
	249
2d06d4a5	250	static unsigned int
7eb35586	251	ebt_ulog_tg(struct sk_buff skb, const struct xt_target_param par)
d5228a4f	252	{
7eb35586 JE	253	ebt_ulog_packet(par->hooknum, skb, par->in, par->out,
7eb35586 JE	254	par->targinfo, NULL);
0ac6ab1f	255	return EBT_CONTINUE;
d5228a4f BDS	256	}
d5228a4f BDS	257
af5d6dc2	258	static bool ebt_ulog_tg_check(const struct xt_tgchk_param *par)
1da177e4	259	{
af5d6dc2	260	struct ebt_ulog_info *uloginfo = par->targinfo;
1da177e4	261
18219d3f	262	if (uloginfo->nlgroup > 31)
19eda879	263	return false;
1da177e4 LT	264
	265	uloginfo->prefix[EBT_ULOG_PREFIX_LEN - 1] = '\0';
	266
	267	if (uloginfo->qthreshold > EBT_ULOG_MAX_QLEN)
	268	uloginfo->qthreshold = EBT_ULOG_MAX_QLEN;
	269
8a56df0a	270	return true;
1da177e4 LT	271	}
1da177e4 LT	272
043ef46c JE	273	static struct xt_target ebt_ulog_tg_reg __read_mostly = {
043ef46c JE	274	.name = "ulog",
001a18d3 JE	275	.revision = 0,
001a18d3 JE	276	.family = NFPROTO_BRIDGE,
2d06d4a5 JE	277	.target = ebt_ulog_tg,
2d06d4a5 JE	278	.checkentry = ebt_ulog_tg_check,
fc0e3df4	279	.targetsize = sizeof(struct ebt_ulog_info),
1da177e4 LT	280	.me = THIS_MODULE,
	281	};
	282
704b3ea3	283	static struct nf_logger ebt_ulog_logger __read_mostly = {
7249dee5	284	.name = "ebt_ulog",
d5228a4f BDS	285	.logfn = &ebt_log_packet,
	286	.me = THIS_MODULE,
	287	};
	288
65b4b4e8	289	static int __init ebt_ulog_init(void)
1da177e4	290	{
3b334d42	291	int ret;
19eda879	292	int i;
1da177e4 LT	293
	294	if (nlbufsiz >= 128*1024) {
	295	printk(KERN_NOTICE "ebt_ulog: Netlink buffer has to be <= 128kB,"
	296	" please try a smaller nlbufsiz parameter.\n");
3b334d42	297	return -EINVAL;
1da177e4 LT	298	}
	299
	300	/* initialize ulog_buffers */
	301	for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
e6f689db	302	setup_timer(&ulog_buffers[i].timer, ulog_timer, i);
1da177e4 LT	303	spin_lock_init(&ulog_buffers[i].lock);
	304	}
	305
b4b51029 EB	306	ebtulognl = netlink_kernel_create(&init_net, NETLINK_NFLOG,
	307	EBT_ULOG_MAXNLGROUPS, NULL, NULL,
	308	THIS_MODULE);
19eda879 JE	309	if (!ebtulognl) {
	310	printk(KERN_WARNING KBUILD_MODNAME ": out of memory trying to "
	311	"call netlink_kernel_create\n");
3b334d42 EL	312	ret = -ENOMEM;
3b334d42 EL	313	} else if ((ret = xt_register_target(&ebt_ulog_tg_reg)) != 0) {
b7c6ba6e	314	netlink_kernel_release(ebtulognl);
19eda879	315	}
1da177e4	316
3b334d42	317	if (ret == 0)
ee999d8b	318	nf_log_register(NFPROTO_BRIDGE, &ebt_ulog_logger);
d5228a4f	319
1da177e4 LT	320	return ret;
	321	}
	322
65b4b4e8	323	static void __exit ebt_ulog_fini(void)
1da177e4 LT	324	{
	325	ebt_ulog_buff_t *ub;
	326	int i;
	327
e92ad99c	328	nf_log_unregister(&ebt_ulog_logger);
043ef46c	329	xt_unregister_target(&ebt_ulog_tg_reg);
1da177e4 LT	330	for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
	331	ub = &ulog_buffers[i];
	332	if (timer_pending(&ub->timer))
	333	del_timer(&ub->timer);
	334	spin_lock_bh(&ub->lock);
	335	if (ub->skb) {
	336	kfree_skb(ub->skb);
	337	ub->skb = NULL;
	338	}
	339	spin_unlock_bh(&ub->lock);
	340	}
b7c6ba6e	341	netlink_kernel_release(ebtulognl);
1da177e4 LT	342	}
1da177e4 LT	343
65b4b4e8 AM	344	module_init(ebt_ulog_init);
65b4b4e8 AM	345	module_exit(ebt_ulog_fini);
1da177e4 LT	346	MODULE_LICENSE("GPL");
1da177e4 LT	347	MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
f776c4cd	348	MODULE_DESCRIPTION("Ebtables: Packet logging to netlink using ULOG");