2 * This is a module which is used for logging packets to userspace via
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
7 * Based on the old ipv4-only ipt_ULOG.c:
8 * (C) 2000-2004 by Harald Welte <laforge@netfilter.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/module.h>
16 #include <linux/skbuff.h>
17 #include <linux/init.h>
19 #include <linux/ipv6.h>
20 #include <linux/netdevice.h>
21 #include <linux/netfilter.h>
22 #include <linux/netlink.h>
23 #include <linux/netfilter/nfnetlink.h>
24 #include <linux/netfilter/nfnetlink_log.h>
25 #include <linux/spinlock.h>
26 #include <linux/sysctl.h>
27 #include <linux/proc_fs.h>
28 #include <linux/security.h>
29 #include <linux/list.h>
30 #include <linux/jhash.h>
31 #include <linux/random.h>
34 #include <asm/atomic.h>
36 #define NFULNL_NLBUFSIZ_DEFAULT 4096
37 #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
38 #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
40 #define PRINTR(x, args...) do { if (net_ratelimit()) \
41 printk(x, ## args); } while (0);
44 #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \
45 __FILE__, __LINE__, __FUNCTION__, \
48 #define UDEBUG(x, ...)
51 struct nfulnl_instance {
52 struct hlist_node hlist; /* global list of instances */
54 atomic_t use; /* use count */
56 unsigned int qlen; /* number of nlmsgs in skb */
57 struct sk_buff *skb; /* pre-allocatd skb */
58 struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */
59 struct timer_list timer;
60 int peer_pid; /* PID of the peer process */
62 /* configurable parameters */
63 unsigned int flushtimeout; /* timeout until queue flush */
64 unsigned int nlbufsiz; /* netlink buffer allocation size */
65 unsigned int qthreshold; /* threshold of the queue */
67 u_int16_t group_num; /* number of this queue */
71 static DEFINE_RWLOCK(instances_lock);
73 #define INSTANCE_BUCKETS 16
74 static struct hlist_head instance_table[INSTANCE_BUCKETS];
75 static unsigned int hash_init;
77 static inline u_int8_t instance_hashfn(u_int16_t group_num)
79 return ((group_num & 0xff) % INSTANCE_BUCKETS);
82 static struct nfulnl_instance *
83 __instance_lookup(u_int16_t group_num)
85 struct hlist_head *head;
86 struct hlist_node *pos;
87 struct nfulnl_instance *inst;
89 UDEBUG("entering (group_num=%u)\n", group_num);
91 head = &instance_table[instance_hashfn(group_num)];
92 hlist_for_each_entry(inst, pos, head, hlist) {
93 if (inst->group_num == group_num)
100 instance_get(struct nfulnl_instance *inst)
102 atomic_inc(&inst->use);
105 static struct nfulnl_instance *
106 instance_lookup_get(u_int16_t group_num)
108 struct nfulnl_instance *inst;
110 read_lock_bh(&instances_lock);
111 inst = __instance_lookup(group_num);
114 read_unlock_bh(&instances_lock);
120 instance_put(struct nfulnl_instance *inst)
122 if (inst && atomic_dec_and_test(&inst->use)) {
123 UDEBUG("kfree(inst=%p)\n", inst);
128 static void nfulnl_timer(unsigned long data);
130 static struct nfulnl_instance *
131 instance_create(u_int16_t group_num, int pid)
133 struct nfulnl_instance *inst;
135 UDEBUG("entering (group_num=%u, pid=%d)\n", group_num,
138 write_lock_bh(&instances_lock);
139 if (__instance_lookup(group_num)) {
141 UDEBUG("aborting, instance already exists\n");
145 inst = kmalloc(sizeof(*inst), GFP_ATOMIC);
149 memset(inst, 0, sizeof(*inst));
150 INIT_HLIST_NODE(&inst->hlist);
151 inst->lock = SPIN_LOCK_UNLOCKED;
152 /* needs to be two, since we _put() after creation */
153 atomic_set(&inst->use, 2);
155 init_timer(&inst->timer);
156 inst->timer.function = nfulnl_timer;
157 inst->timer.data = (unsigned long)inst;
158 /* don't start timer yet. (re)start it with every packet */
160 inst->peer_pid = pid;
161 inst->group_num = group_num;
163 inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
164 inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
165 inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
166 inst->copy_mode = NFULNL_COPY_PACKET;
167 inst->copy_range = 0xffff;
169 if (!try_module_get(THIS_MODULE))
172 hlist_add_head(&inst->hlist,
173 &instance_table[instance_hashfn(group_num)]);
175 UDEBUG("newly added node: %p, next=%p\n", &inst->hlist,
178 write_unlock_bh(&instances_lock);
185 write_unlock_bh(&instances_lock);
189 static int __nfulnl_send(struct nfulnl_instance *inst);
192 _instance_destroy2(struct nfulnl_instance *inst, int lock)
194 /* first pull it out of the global list */
196 write_lock_bh(&instances_lock);
198 UDEBUG("removing instance %p (queuenum=%u) from hash\n",
199 inst, inst->group_num);
201 hlist_del(&inst->hlist);
204 write_unlock_bh(&instances_lock);
206 /* then flush all pending packets from skb */
208 spin_lock_bh(&inst->lock);
213 kfree_skb(inst->skb);
217 spin_unlock_bh(&inst->lock);
219 /* and finally put the refcount */
222 module_put(THIS_MODULE);
226 __instance_destroy(struct nfulnl_instance *inst)
228 _instance_destroy2(inst, 0);
232 instance_destroy(struct nfulnl_instance *inst)
234 _instance_destroy2(inst, 1);
238 nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
243 spin_lock_bh(&inst->lock);
246 case NFULNL_COPY_NONE:
247 case NFULNL_COPY_META:
248 inst->copy_mode = mode;
249 inst->copy_range = 0;
252 case NFULNL_COPY_PACKET:
253 inst->copy_mode = mode;
254 /* we're using struct nfattr which has 16bit nfa_len */
256 inst->copy_range = 0xffff;
258 inst->copy_range = range;
266 spin_unlock_bh(&inst->lock);
272 nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
276 spin_lock_bh(&inst->lock);
277 if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
279 else if (nlbufsiz > 131072)
282 inst->nlbufsiz = nlbufsiz;
285 spin_unlock_bh(&inst->lock);
291 nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
293 spin_lock_bh(&inst->lock);
294 inst->flushtimeout = timeout;
295 spin_unlock_bh(&inst->lock);
301 nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
303 spin_lock_bh(&inst->lock);
304 inst->qthreshold = qthresh;
305 spin_unlock_bh(&inst->lock);
310 static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size,
311 unsigned int pkt_size)
315 UDEBUG("entered (%u, %u)\n", inst_size, pkt_size);
317 /* alloc skb which should be big enough for a whole multipart
318 * message. WARNING: has to be <= 128k due to slab restrictions */
320 skb = alloc_skb(inst_size, GFP_ATOMIC);
322 PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n",
325 /* try to allocate only as much as we need for current
328 skb = alloc_skb(pkt_size, GFP_ATOMIC);
330 PRINTR("nfnetlink_log: can't even alloc %u bytes\n",
338 __nfulnl_send(struct nfulnl_instance *inst)
342 if (timer_pending(&inst->timer))
343 del_timer(&inst->timer);
346 inst->lastnlh->nlmsg_type = NLMSG_DONE;
348 status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT);
350 UDEBUG("netlink_unicast() failed\n");
351 /* FIXME: statistics */
356 inst->lastnlh = NULL;
361 static void nfulnl_timer(unsigned long data)
363 struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
365 UDEBUG("timer function called, flushing buffer\n");
367 spin_lock_bh(&inst->lock);
370 spin_unlock_bh(&inst->lock);
374 __build_packet_message(struct nfulnl_instance *inst,
375 const struct sk_buff *skb,
376 unsigned int data_len,
378 unsigned int hooknum,
379 const struct net_device *indev,
380 const struct net_device *outdev,
381 const struct nf_loginfo *li,
384 unsigned char *old_tail;
385 struct nfulnl_msg_packet_hdr pmsg;
386 struct nlmsghdr *nlh;
387 struct nfgenmsg *nfmsg;
392 old_tail = inst->skb->tail;
393 nlh = NLMSG_PUT(inst->skb, 0, 0,
394 NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
395 sizeof(struct nfgenmsg));
396 nfmsg = NLMSG_DATA(nlh);
397 nfmsg->nfgen_family = pf;
398 nfmsg->version = NFNETLINK_V0;
399 nfmsg->res_id = htons(inst->group_num);
401 pmsg.hw_protocol = htons(skb->protocol);
404 NFA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg);
407 int slen = strlen(prefix);
408 if (slen > NFULNL_PREFIXLEN)
409 slen = NFULNL_PREFIXLEN;
410 NFA_PUT(inst->skb, NFULA_PREFIX, slen, prefix);
414 tmp_uint = htonl(indev->ifindex);
415 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint),
420 tmp_uint = htonl(outdev->ifindex);
421 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint),
426 tmp_uint = htonl(skb->nfmark);
427 NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint);
430 if (indev && skb->dev && skb->dev->hard_header_parse) {
431 struct nfulnl_msg_packet_hw phw;
434 skb->dev->hard_header_parse((struct sk_buff *)skb,
436 phw.hw_addrlen = htons(phw.hw_addrlen);
437 NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw);
440 if (skb->stamp.tv_sec) {
441 struct nfulnl_msg_packet_timestamp ts;
443 ts.sec = cpu_to_be64(skb->stamp.tv_sec);
444 ts.usec = cpu_to_be64(skb->stamp.tv_usec);
446 NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts);
451 read_lock_bh(&skb->sk->sk_callback_lock);
452 if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
453 u_int32_t uid = htonl(skb->sk->sk_socket->file->f_uid);
454 /* need to unlock here since NFA_PUT may goto */
455 read_unlock_bh(&skb->sk->sk_callback_lock);
456 NFA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid);
458 read_unlock_bh(&skb->sk->sk_callback_lock);
463 int size = NFA_LENGTH(data_len);
465 if (skb_tailroom(inst->skb) < (int)NFA_SPACE(data_len)) {
466 printk(KERN_WARNING "nfnetlink_log: no tailroom!\n");
470 nfa = (struct nfattr *)skb_put(inst->skb, NFA_ALIGN(size));
471 nfa->nfa_type = NFULA_PAYLOAD;
474 if (skb_copy_bits(skb, 0, NFA_DATA(nfa), data_len))
478 nlh->nlmsg_len = inst->skb->tail - old_tail;
482 UDEBUG("nlmsg_failure\n");
484 PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
488 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
490 static struct nf_loginfo default_loginfo = {
491 .type = NF_LOG_TYPE_ULOG,
501 /* log handler for internal netfilter logging api */
503 nfulnl_log_packet(unsigned int pf,
504 unsigned int hooknum,
505 const struct sk_buff *skb,
506 const struct net_device *in,
507 const struct net_device *out,
508 const struct nf_loginfo *li_user,
511 unsigned int size, data_len;
512 struct nfulnl_instance *inst;
513 const struct nf_loginfo *li;
514 unsigned int qthreshold;
515 unsigned int nlbufsiz;
517 if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
520 li = &default_loginfo;
522 inst = instance_lookup_get(li->u.ulog.group);
524 inst = instance_lookup_get(0);
526 PRINTR("nfnetlink_log: trying to log packet, "
527 "but no instance for group %u\n", li->u.ulog.group);
531 /* all macros expand to constant values at compile time */
532 /* FIXME: do we want to make the size calculation conditional based on
533 * what is actually present? way more branches and checks, but more
534 * memory efficient... */
535 size = NLMSG_SPACE(sizeof(struct nfgenmsg))
536 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr))
537 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
538 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
539 + NFA_SPACE(sizeof(u_int32_t)) /* mark */
540 + NFA_SPACE(sizeof(u_int32_t)) /* uid */
541 + NFA_SPACE(NFULNL_PREFIXLEN) /* prefix */
542 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw))
543 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp));
545 UDEBUG("initial size=%u\n", size);
547 spin_lock_bh(&inst->lock);
549 qthreshold = inst->qthreshold;
550 /* per-rule qthreshold overrides per-instance */
551 if (qthreshold > li->u.ulog.qthreshold)
552 qthreshold = li->u.ulog.qthreshold;
554 switch (inst->copy_mode) {
555 case NFULNL_COPY_META:
556 case NFULNL_COPY_NONE:
560 case NFULNL_COPY_PACKET:
561 if (inst->copy_range == 0
562 || inst->copy_range > skb->len)
565 data_len = inst->copy_range;
567 size += NFA_SPACE(data_len);
568 UDEBUG("copy_packet, therefore size now %u\n", size);
572 spin_unlock_bh(&inst->lock);
577 if (size > inst->nlbufsiz)
580 nlbufsiz = inst->nlbufsiz;
583 if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) {
584 UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n",
585 inst->nlbufsiz, size);
588 } else if (inst->qlen >= qthreshold ||
589 size > skb_tailroom(inst->skb)) {
590 /* either the queue len is too high or we don't have
591 * enough room in the skb left. flush to userspace. */
592 UDEBUG("flushing old skb\n");
596 if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) {
597 UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n",
598 inst->nlbufsiz, size);
603 UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold);
606 __build_packet_message(inst, skb, data_len, pf,
607 hooknum, in, out, li, prefix);
609 /* timer_pending always called within inst->lock, so there
610 * is no chance of a race here */
611 if (!timer_pending(&inst->timer)) {
613 inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
614 add_timer(&inst->timer);
616 spin_unlock_bh(&inst->lock);
621 spin_unlock_bh(&inst->lock);
623 UDEBUG("error allocating skb\n");
624 /* FIXME: statistics */
628 nfulnl_rcv_nl_event(struct notifier_block *this,
629 unsigned long event, void *ptr)
631 struct netlink_notify *n = ptr;
633 if (event == NETLINK_URELEASE &&
634 n->protocol == NETLINK_NETFILTER && n->pid) {
637 /* destroy all instances for this pid */
638 write_lock_bh(&instances_lock);
639 for (i = 0; i < INSTANCE_BUCKETS; i++) {
640 struct hlist_node *tmp, *t2;
641 struct nfulnl_instance *inst;
642 struct hlist_head *head = &instance_table[i];
644 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
645 UDEBUG("node = %p\n", inst);
646 if (n->pid == inst->peer_pid)
647 __instance_destroy(inst);
650 write_unlock_bh(&instances_lock);
655 static struct notifier_block nfulnl_rtnl_notifier = {
656 .notifier_call = nfulnl_rcv_nl_event,
660 nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
661 struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp)
666 static struct nf_logger nfulnl_logger = {
667 .name = "nfnetlink_log",
668 .logfn = &nfulnl_log_packet,
672 static const int nfula_min[NFULA_MAX] = {
673 [NFULA_PACKET_HDR-1] = sizeof(struct nfulnl_msg_packet_hdr),
674 [NFULA_MARK-1] = sizeof(u_int32_t),
675 [NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp),
676 [NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t),
677 [NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t),
678 [NFULA_HWADDR-1] = sizeof(struct nfulnl_msg_packet_hw),
679 [NFULA_PAYLOAD-1] = 0,
680 [NFULA_PREFIX-1] = 0,
681 [NFULA_UID-1] = sizeof(u_int32_t),
684 static const int nfula_cfg_min[NFULA_CFG_MAX] = {
685 [NFULA_CFG_CMD-1] = sizeof(struct nfulnl_msg_config_cmd),
686 [NFULA_CFG_MODE-1] = sizeof(struct nfulnl_msg_config_mode),
687 [NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t),
688 [NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t),
689 [NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t),
693 nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
694 struct nlmsghdr *nlh, struct nfattr *nfula[], int *errp)
696 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
697 u_int16_t group_num = ntohs(nfmsg->res_id);
698 struct nfulnl_instance *inst;
701 UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type));
703 if (nfattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) {
704 UDEBUG("bad attribute size\n");
708 inst = instance_lookup_get(group_num);
709 if (nfula[NFULA_CFG_CMD-1]) {
710 u_int8_t pf = nfmsg->nfgen_family;
711 struct nfulnl_msg_config_cmd *cmd;
712 cmd = NFA_DATA(nfula[NFULA_CFG_CMD-1]);
713 UDEBUG("found CFG_CMD for\n");
715 switch (cmd->command) {
716 case NFULNL_CFG_CMD_BIND:
722 inst = instance_create(group_num,
723 NETLINK_CB(skb).pid);
729 case NFULNL_CFG_CMD_UNBIND:
735 if (inst->peer_pid != NETLINK_CB(skb).pid) {
740 instance_destroy(inst);
742 case NFULNL_CFG_CMD_PF_BIND:
743 UDEBUG("registering log handler for pf=%u\n", pf);
744 ret = nf_log_register(pf, &nfulnl_logger);
746 case NFULNL_CFG_CMD_PF_UNBIND:
747 UDEBUG("unregistering log handler for pf=%u\n", pf);
748 /* This is a bug and a feature. We cannot unregister
749 * other handlers, like nfnetlink_inst can */
750 nf_log_unregister_pf(pf);
758 UDEBUG("no config command, and no instance for "
759 "group=%u pid=%u =>ENOENT\n",
760 group_num, NETLINK_CB(skb).pid);
765 if (inst->peer_pid != NETLINK_CB(skb).pid) {
766 UDEBUG("no config command, and wrong pid\n");
772 if (nfula[NFULA_CFG_MODE-1]) {
773 struct nfulnl_msg_config_mode *params;
774 params = NFA_DATA(nfula[NFULA_CFG_MODE-1]);
776 nfulnl_set_mode(inst, params->copy_mode,
777 ntohs(params->copy_range));
780 if (nfula[NFULA_CFG_TIMEOUT-1]) {
782 *(u_int32_t *)NFA_DATA(nfula[NFULA_CFG_TIMEOUT-1]);
784 nfulnl_set_timeout(inst, ntohl(timeout));
787 if (nfula[NFULA_CFG_NLBUFSIZ-1]) {
789 *(u_int32_t *)NFA_DATA(nfula[NFULA_CFG_NLBUFSIZ-1]);
791 nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
794 if (nfula[NFULA_CFG_QTHRESH-1]) {
796 *(u_int16_t *)NFA_DATA(nfula[NFULA_CFG_QTHRESH-1]);
798 nfulnl_set_qthresh(inst, ntohl(qthresh));
806 static struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
807 [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
808 .cap_required = CAP_NET_ADMIN },
809 [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
810 .cap_required = CAP_NET_ADMIN },
813 static struct nfnetlink_subsystem nfulnl_subsys = {
815 .subsys_id = NFNL_SUBSYS_ULOG,
816 .cb_count = NFULNL_MSG_MAX,
817 .attr_count = NFULA_MAX,
821 #ifdef CONFIG_PROC_FS
826 static struct hlist_node *get_first(struct seq_file *seq)
828 struct iter_state *st = seq->private;
833 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
834 if (!hlist_empty(&instance_table[st->bucket]))
835 return instance_table[st->bucket].first;
840 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
842 struct iter_state *st = seq->private;
846 if (++st->bucket >= INSTANCE_BUCKETS)
849 h = instance_table[st->bucket].first;
854 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
856 struct hlist_node *head;
857 head = get_first(seq);
860 while (pos && (head = get_next(seq, head)))
862 return pos ? NULL : head;
865 static void *seq_start(struct seq_file *seq, loff_t *pos)
867 read_lock_bh(&instances_lock);
868 return get_idx(seq, *pos);
871 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
874 return get_next(s, v);
877 static void seq_stop(struct seq_file *s, void *v)
879 read_unlock_bh(&instances_lock);
882 static int seq_show(struct seq_file *s, void *v)
884 const struct nfulnl_instance *inst = v;
886 return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
888 inst->peer_pid, inst->qlen,
889 inst->copy_mode, inst->copy_range,
890 inst->flushtimeout, atomic_read(&inst->use));
893 static struct seq_operations nful_seq_ops = {
900 static int nful_open(struct inode *inode, struct file *file)
902 struct seq_file *seq;
903 struct iter_state *is;
906 is = kmalloc(sizeof(*is), GFP_KERNEL);
909 memset(is, 0, sizeof(*is));
910 ret = seq_open(file, &nful_seq_ops);
913 seq = file->private_data;
921 static struct file_operations nful_file_ops = {
922 .owner = THIS_MODULE,
926 .release = seq_release_private,
932 init_or_cleanup(int init)
934 int i, status = -ENOMEM;
935 #ifdef CONFIG_PROC_FS
936 struct proc_dir_entry *proc_nful;
942 for (i = 0; i < INSTANCE_BUCKETS; i++)
943 INIT_HLIST_HEAD(&instance_table[i]);
945 /* it's not really all that important to have a random value, so
946 * we can do this from the init function, even if there hasn't
947 * been that much entropy yet */
948 get_random_bytes(&hash_init, sizeof(hash_init));
950 netlink_register_notifier(&nfulnl_rtnl_notifier);
951 status = nfnetlink_subsys_register(&nfulnl_subsys);
953 printk(KERN_ERR "log: failed to create netlink socket\n");
954 goto cleanup_netlink_notifier;
957 #ifdef CONFIG_PROC_FS
958 proc_nful = create_proc_entry("nfnetlink_log", 0440,
962 proc_nful->proc_fops = &nful_file_ops;
968 nf_log_unregister_logger(&nfulnl_logger);
969 #ifdef CONFIG_PROC_FS
970 remove_proc_entry("nfnetlink_log", proc_net_netfilter);
973 nfnetlink_subsys_unregister(&nfulnl_subsys);
974 cleanup_netlink_notifier:
975 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
979 static int __init init(void)
982 return init_or_cleanup(1);
985 static void __exit fini(void)
990 MODULE_DESCRIPTION("netfilter userspace logging");
991 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
992 MODULE_LICENSE("GPL");