[net-next-2.6.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/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(const struct sk_buff *skb, unsigned int hooknr,
   const struct net_device *in, const struct net_device *out,
   const void *data, unsigned int datalen)
{
	const struct ebt_ulog_info *uloginfo = data;

	ebt_ulog_packet(hooknr, skb, in, out, uloginfo, NULL);
	return EBT_CONTINUE;
}

static bool ebt_ulog_check(const char *tablename, unsigned int hookmask,
   const struct ebt_entry *e, void *data, unsigned int datalen)
{
	struct ebt_ulog_info *uloginfo = data;

	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 0;
}

static struct ebt_watcher ulog __read_mostly = {
	.name		= EBT_ULOG_WATCHER,
	.revision	= 0,
	.family		= NFPROTO_BRIDGE,
	.watcher	= ebt_ulog,
	.check		= ebt_ulog_check,
	.targetsize	= XT_ALIGN(sizeof(struct ebt_ulog_info)),
	.me		= THIS_MODULE,
};

static const struct nf_logger ebt_ulog_logger = {
	.name		= EBT_ULOG_WATCHER,
	.logfn		= &ebt_log_packet,
	.me		= THIS_MODULE,
};

static int __init ebt_ulog_init(void)
{
	bool ret = true;
	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 false;
	}

	/* 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 = false;
	} else if (ebt_register_watcher(&ulog) != 0) {
		netlink_kernel_release(ebtulognl);
	}

	if (ret)
		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);
	ebt_unregister_watcher(&ulog);
	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>
1da177e4 LT	32	#include <linux/spinlock.h>
	33	#include <linux/socket.h>
	34	#include <linux/skbuff.h>
	35	#include <linux/kernel.h>
	36	#include <linux/timer.h>
	37	#include <linux/netlink.h>
	38	#include <linux/netdevice.h>
18219d3f	39	#include <linux/netfilter/x_tables.h>
1da177e4 LT	40	#include <linux/netfilter_bridge/ebtables.h>
1da177e4 LT	41	#include <linux/netfilter_bridge/ebt_ulog.h>
f01ffbd6	42	#include <net/netfilter/nf_log.h>
1da177e4 LT	43	#include <net/sock.h>
	44	#include "../br_private.h"
	45
	46	#define PRINTR(format, args...) do { if (net_ratelimit()) \
9d6f229f	47	printk(format , ## args); } while (0)
1da177e4	48
c2db2924	49	static unsigned int nlbufsiz = NLMSG_GOODSIZE;
1da177e4 LT	50	module_param(nlbufsiz, uint, 0600);
1da177e4 LT	51	MODULE_PARM_DESC(nlbufsiz, "netlink buffer size (number of bytes) "
9d6f229f	52	"(defaults to 4096)");
1da177e4 LT	53
	54	static unsigned int flushtimeout = 10;
	55	module_param(flushtimeout, uint, 0600);
	56	MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths ofa second) "
9d6f229f	57	"(defaults to 10)");
1da177e4 LT	58
	59	typedef struct {
	60	unsigned int qlen; /* number of nlmsgs' in the skb */
	61	struct nlmsghdr lastnlh; / netlink header of last msg in skb */
	62	struct sk_buff skb; / the pre-allocated skb */
	63	struct timer_list timer; /* the timer function */
	64	spinlock_t lock; /* the per-queue lock */
	65	} ebt_ulog_buff_t;
	66
	67	static ebt_ulog_buff_t ulog_buffers[EBT_ULOG_MAXNLGROUPS];
	68	static struct sock *ebtulognl;
	69
	70	/* send one ulog_buff_t to userspace */
	71	static void ulog_send(unsigned int nlgroup)
	72	{
	73	ebt_ulog_buff_t *ub = &ulog_buffers[nlgroup];
	74
	75	if (timer_pending(&ub->timer))
	76	del_timer(&ub->timer);
	77
dcb7cd97 MH	78	if (!ub->skb)
	79	return;
	80
1da177e4 LT	81	/* last nlmsg needs NLMSG_DONE */
	82	if (ub->qlen > 1)
	83	ub->lastnlh->nlmsg_type = NLMSG_DONE;
	84
ac6d439d PM	85	NETLINK_CB(ub->skb).dst_group = nlgroup + 1;
ac6d439d PM	86	netlink_broadcast(ebtulognl, ub->skb, 0, nlgroup + 1, GFP_ATOMIC);
1da177e4 LT	87
	88	ub->qlen = 0;
	89	ub->skb = NULL;
	90	}
	91
	92	/* timer function to flush queue in flushtimeout time */
	93	static void ulog_timer(unsigned long data)
	94	{
	95	spin_lock_bh(&ulog_buffers[data].lock);
	96	if (ulog_buffers[data].skb)
	97	ulog_send(data);
	98	spin_unlock_bh(&ulog_buffers[data].lock);
	99	}
	100
	101	static struct sk_buff *ulog_alloc_skb(unsigned int size)
	102	{
	103	struct sk_buff *skb;
ad2ad0f9	104	unsigned int n;
1da177e4	105
ad2ad0f9 PM	106	n = max(size, nlbufsiz);
ad2ad0f9 PM	107	skb = alloc_skb(n, GFP_ATOMIC);
1da177e4 LT	108	if (!skb) {
1da177e4 LT	109	PRINTR(KERN_ERR "ebt_ulog: can't alloc whole buffer "
ad2ad0f9 PM	110	"of size %ub!\n", n);
ad2ad0f9 PM	111	if (n > size) {
1da177e4 LT	112	/* try to allocate only as much as we need for
	113	* current packet */
	114	skb = alloc_skb(size, GFP_ATOMIC);
	115	if (!skb)
	116	PRINTR(KERN_ERR "ebt_ulog: can't even allocate "
	117	"buffer of size %ub\n", size);
	118	}
	119	}
	120
	121	return skb;
	122	}
	123
d5228a4f	124	static void ebt_ulog_packet(unsigned int hooknr, const struct sk_buff *skb,
1da177e4	125	const struct net_device in, const struct net_device out,
d5228a4f	126	const struct ebt_ulog_info uloginfo, const char prefix)
1da177e4 LT	127	{
	128	ebt_ulog_packet_msg_t *pm;
	129	size_t size, copy_len;
	130	struct nlmsghdr *nlh;
1da177e4 LT	131	unsigned int group = uloginfo->nlgroup;
	132	ebt_ulog_buff_t *ub = &ulog_buffers[group];
	133	spinlock_t *lock = &ub->lock;
b7aa0bf7	134	ktime_t kt;
1da177e4 LT	135
	136	if ((uloginfo->cprange == 0) \|\|
	137	(uloginfo->cprange > skb->len + ETH_HLEN))
	138	copy_len = skb->len + ETH_HLEN;
	139	else
	140	copy_len = uloginfo->cprange;
	141
	142	size = NLMSG_SPACE(sizeof(*pm) + copy_len);
	143	if (size > nlbufsiz) {
	144	PRINTR("ebt_ulog: Size %Zd needed, but nlbufsiz=%d\n",
	145	size, nlbufsiz);
	146	return;
	147	}
	148
	149	spin_lock_bh(lock);
	150
	151	if (!ub->skb) {
	152	if (!(ub->skb = ulog_alloc_skb(size)))
	153	goto alloc_failure;
	154	} else if (size > skb_tailroom(ub->skb)) {
	155	ulog_send(group);
	156
	157	if (!(ub->skb = ulog_alloc_skb(size)))
	158	goto alloc_failure;
	159	}
	160
	161	nlh = NLMSG_PUT(ub->skb, 0, ub->qlen, 0,
9d6f229f	162	size - NLMSG_ALIGN(sizeof(*nlh)));
1da177e4 LT	163	ub->qlen++;
	164
	165	pm = NLMSG_DATA(nlh);
	166
	167	/* Fill in the ulog data */
	168	pm->version = EBT_ULOG_VERSION;
b7aa0bf7 ED	169	kt = ktime_get_real();
b7aa0bf7 ED	170	pm->stamp = ktime_to_timeval(kt);
1da177e4	171	if (ub->qlen == 1)
b7aa0bf7	172	ub->skb->tstamp = kt;
1da177e4	173	pm->data_len = copy_len;
82e91ffe	174	pm->mark = skb->mark;
1da177e4 LT	175	pm->hook = hooknr;
	176	if (uloginfo->prefix != NULL)
	177	strcpy(pm->prefix, uloginfo->prefix);
	178	else
	179	*(pm->prefix) = '\0';
	180
	181	if (in) {
	182	strcpy(pm->physindev, in->name);
	183	/* If in isn't a bridge, then physindev==indev */
	184	if (in->br_port)
	185	strcpy(pm->indev, in->br_port->br->dev->name);
	186	else
	187	strcpy(pm->indev, in->name);
	188	} else
	189	pm->indev[0] = pm->physindev[0] = '\0';
	190
	191	if (out) {
	192	/* If out exists, then out is a bridge port */
	193	strcpy(pm->physoutdev, out->name);
	194	strcpy(pm->outdev, out->br_port->br->dev->name);
	195	} else
	196	pm->outdev[0] = pm->physoutdev[0] = '\0';
	197
	198	if (skb_copy_bits(skb, -ETH_HLEN, pm->data, copy_len) < 0)
	199	BUG();
	200
	201	if (ub->qlen > 1)
	202	ub->lastnlh->nlmsg_flags \|= NLM_F_MULTI;
	203
	204	ub->lastnlh = nlh;
	205
	206	if (ub->qlen >= uloginfo->qthreshold)
	207	ulog_send(group);
	208	else if (!timer_pending(&ub->timer)) {
	209	ub->timer.expires = jiffies + flushtimeout * HZ / 100;
	210	add_timer(&ub->timer);
	211	}
	212
	213	unlock:
	214	spin_unlock_bh(lock);
	215
	216	return;
	217
	218	nlmsg_failure:
	219	printk(KERN_CRIT "ebt_ulog: error during NLMSG_PUT. This should "
	220	"not happen, please report to author.\n");
	221	goto unlock;
	222	alloc_failure:
	223	goto unlock;
	224	}
	225
d5228a4f	226	/* this function is registered with the netfilter core */
76108cea	227	static void ebt_log_packet(u_int8_t pf, unsigned int hooknum,
d5228a4f BDS	228	const struct sk_buff skb, const struct net_device in,
	229	const struct net_device out, const struct nf_loginfo li,
	230	const char *prefix)
	231	{
	232	struct ebt_ulog_info loginfo;
	233
	234	if (!li \|\| li->type != NF_LOG_TYPE_ULOG) {
	235	loginfo.nlgroup = EBT_ULOG_DEFAULT_NLGROUP;
	236	loginfo.cprange = 0;
	237	loginfo.qthreshold = EBT_ULOG_DEFAULT_QTHRESHOLD;
	238	loginfo.prefix[0] = '\0';
	239	} else {
	240	loginfo.nlgroup = li->u.ulog.group;
	241	loginfo.cprange = li->u.ulog.copy_len;
	242	loginfo.qthreshold = li->u.ulog.qthreshold;
	243	strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix));
	244	}
	245
	246	ebt_ulog_packet(hooknum, skb, in, out, &loginfo, prefix);
	247	}
	248
0ac6ab1f	249	static unsigned int ebt_ulog(const struct sk_buff *skb, unsigned int hooknr,
d5228a4f BDS	250	const struct net_device in, const struct net_device out,
	251	const void *data, unsigned int datalen)
	252	{
abfdf1c4	253	const struct ebt_ulog_info *uloginfo = data;
d5228a4f BDS	254
d5228a4f BDS	255	ebt_ulog_packet(hooknr, skb, in, out, uloginfo, NULL);
0ac6ab1f	256	return EBT_CONTINUE;
d5228a4f BDS	257	}
d5228a4f BDS	258
19eda879	259	static bool ebt_ulog_check(const char *tablename, unsigned int hookmask,
1da177e4 LT	260	const struct ebt_entry e, void data, unsigned int datalen)
1da177e4 LT	261	{
abfdf1c4	262	struct ebt_ulog_info *uloginfo = data;
1da177e4	263
18219d3f	264	if (uloginfo->nlgroup > 31)
19eda879	265	return false;
1da177e4 LT	266
	267	uloginfo->prefix[EBT_ULOG_PREFIX_LEN - 1] = '\0';
	268
	269	if (uloginfo->qthreshold > EBT_ULOG_MAX_QLEN)
	270	uloginfo->qthreshold = EBT_ULOG_MAX_QLEN;
	271
	272	return 0;
	273	}
	274
30083c95	275	static struct ebt_watcher ulog __read_mostly = {
1da177e4	276	.name = EBT_ULOG_WATCHER,
001a18d3 JE	277	.revision = 0,
001a18d3 JE	278	.family = NFPROTO_BRIDGE,
1da177e4 LT	279	.watcher = ebt_ulog,
1da177e4 LT	280	.check = ebt_ulog_check,
18219d3f	281	.targetsize = XT_ALIGN(sizeof(struct ebt_ulog_info)),
1da177e4 LT	282	.me = THIS_MODULE,
	283	};
	284
7b2f9631	285	static const struct nf_logger ebt_ulog_logger = {
d5228a4f BDS	286	.name = EBT_ULOG_WATCHER,
	287	.logfn = &ebt_log_packet,
	288	.me = THIS_MODULE,
	289	};
	290
65b4b4e8	291	static int __init ebt_ulog_init(void)
1da177e4	292	{
19eda879 JE	293	bool ret = true;
19eda879 JE	294	int i;
1da177e4 LT	295
	296	if (nlbufsiz >= 128*1024) {
	297	printk(KERN_NOTICE "ebt_ulog: Netlink buffer has to be <= 128kB,"
	298	" please try a smaller nlbufsiz parameter.\n");
19eda879	299	return false;
1da177e4 LT	300	}
	301
	302	/* initialize ulog_buffers */
	303	for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
e6f689db	304	setup_timer(&ulog_buffers[i].timer, ulog_timer, i);
1da177e4 LT	305	spin_lock_init(&ulog_buffers[i].lock);
	306	}
	307
b4b51029 EB	308	ebtulognl = netlink_kernel_create(&init_net, NETLINK_NFLOG,
	309	EBT_ULOG_MAXNLGROUPS, NULL, NULL,
	310	THIS_MODULE);
19eda879 JE	311	if (!ebtulognl) {
	312	printk(KERN_WARNING KBUILD_MODNAME ": out of memory trying to "
	313	"call netlink_kernel_create\n");
	314	ret = false;
	315	} else if (ebt_register_watcher(&ulog) != 0) {
b7c6ba6e	316	netlink_kernel_release(ebtulognl);
19eda879	317	}
1da177e4	318
19eda879	319	if (ret)
ee999d8b	320	nf_log_register(NFPROTO_BRIDGE, &ebt_ulog_logger);
d5228a4f	321
1da177e4 LT	322	return ret;
	323	}
	324
65b4b4e8	325	static void __exit ebt_ulog_fini(void)
1da177e4 LT	326	{
	327	ebt_ulog_buff_t *ub;
	328	int i;
	329
e92ad99c	330	nf_log_unregister(&ebt_ulog_logger);
1da177e4 LT	331	ebt_unregister_watcher(&ulog);
	332	for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
	333	ub = &ulog_buffers[i];
	334	if (timer_pending(&ub->timer))
	335	del_timer(&ub->timer);
	336	spin_lock_bh(&ub->lock);
	337	if (ub->skb) {
	338	kfree_skb(ub->skb);
	339	ub->skb = NULL;
	340	}
	341	spin_unlock_bh(&ub->lock);
	342	}
b7c6ba6e	343	netlink_kernel_release(ebtulognl);
1da177e4 LT	344	}
1da177e4 LT	345
65b4b4e8 AM	346	module_init(ebt_ulog_init);
65b4b4e8 AM	347	module_exit(ebt_ulog_fini);
1da177e4 LT	348	MODULE_LICENSE("GPL");
1da177e4 LT	349	MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
f776c4cd	350	MODULE_DESCRIPTION("Ebtables: Packet logging to netlink using ULOG");