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 #ifdef CONFIG_BRIDGE_NETFILTER
37 #include "../bridge/br_private.h"
40 #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
41 #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
42 #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
44 #define PRINTR(x, args...) do { if (net_ratelimit()) \
45 printk(x, ## args); } while (0);
48 #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \
49 __FILE__, __LINE__, __FUNCTION__, \
52 #define UDEBUG(x, ...)
55 struct nfulnl_instance {
56 struct hlist_node hlist; /* global list of instances */
58 atomic_t use; /* use count */
60 unsigned int qlen; /* number of nlmsgs in skb */
61 struct sk_buff *skb; /* pre-allocatd skb */
62 struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */
63 struct timer_list timer;
64 int peer_pid; /* PID of the peer process */
66 /* configurable parameters */
67 unsigned int flushtimeout; /* timeout until queue flush */
68 unsigned int nlbufsiz; /* netlink buffer allocation size */
69 unsigned int qthreshold; /* threshold of the queue */
71 u_int16_t group_num; /* number of this queue */
75 static DEFINE_RWLOCK(instances_lock);
77 #define INSTANCE_BUCKETS 16
78 static struct hlist_head instance_table[INSTANCE_BUCKETS];
79 static unsigned int hash_init;
81 static inline u_int8_t instance_hashfn(u_int16_t group_num)
83 return ((group_num & 0xff) % INSTANCE_BUCKETS);
86 static struct nfulnl_instance *
87 __instance_lookup(u_int16_t group_num)
89 struct hlist_head *head;
90 struct hlist_node *pos;
91 struct nfulnl_instance *inst;
93 UDEBUG("entering (group_num=%u)\n", group_num);
95 head = &instance_table[instance_hashfn(group_num)];
96 hlist_for_each_entry(inst, pos, head, hlist) {
97 if (inst->group_num == group_num)
104 instance_get(struct nfulnl_instance *inst)
106 atomic_inc(&inst->use);
109 static struct nfulnl_instance *
110 instance_lookup_get(u_int16_t group_num)
112 struct nfulnl_instance *inst;
114 read_lock_bh(&instances_lock);
115 inst = __instance_lookup(group_num);
118 read_unlock_bh(&instances_lock);
124 instance_put(struct nfulnl_instance *inst)
126 if (inst && atomic_dec_and_test(&inst->use)) {
127 UDEBUG("kfree(inst=%p)\n", inst);
132 static void nfulnl_timer(unsigned long data);
134 static struct nfulnl_instance *
135 instance_create(u_int16_t group_num, int pid)
137 struct nfulnl_instance *inst;
139 UDEBUG("entering (group_num=%u, pid=%d)\n", group_num,
142 write_lock_bh(&instances_lock);
143 if (__instance_lookup(group_num)) {
145 UDEBUG("aborting, instance already exists\n");
149 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
153 INIT_HLIST_NODE(&inst->hlist);
154 spin_lock_init(&inst->lock);
155 /* needs to be two, since we _put() after creation */
156 atomic_set(&inst->use, 2);
158 init_timer(&inst->timer);
159 inst->timer.function = nfulnl_timer;
160 inst->timer.data = (unsigned long)inst;
161 /* don't start timer yet. (re)start it with every packet */
163 inst->peer_pid = pid;
164 inst->group_num = group_num;
166 inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
167 inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
168 inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
169 inst->copy_mode = NFULNL_COPY_PACKET;
170 inst->copy_range = 0xffff;
172 if (!try_module_get(THIS_MODULE))
175 hlist_add_head(&inst->hlist,
176 &instance_table[instance_hashfn(group_num)]);
178 UDEBUG("newly added node: %p, next=%p\n", &inst->hlist,
181 write_unlock_bh(&instances_lock);
188 write_unlock_bh(&instances_lock);
192 static int __nfulnl_send(struct nfulnl_instance *inst);
195 _instance_destroy2(struct nfulnl_instance *inst, int lock)
197 /* first pull it out of the global list */
199 write_lock_bh(&instances_lock);
201 UDEBUG("removing instance %p (queuenum=%u) from hash\n",
202 inst, inst->group_num);
204 hlist_del(&inst->hlist);
207 write_unlock_bh(&instances_lock);
209 /* then flush all pending packets from skb */
211 spin_lock_bh(&inst->lock);
216 kfree_skb(inst->skb);
220 spin_unlock_bh(&inst->lock);
222 /* and finally put the refcount */
225 module_put(THIS_MODULE);
229 __instance_destroy(struct nfulnl_instance *inst)
231 _instance_destroy2(inst, 0);
235 instance_destroy(struct nfulnl_instance *inst)
237 _instance_destroy2(inst, 1);
241 nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
246 spin_lock_bh(&inst->lock);
249 case NFULNL_COPY_NONE:
250 case NFULNL_COPY_META:
251 inst->copy_mode = mode;
252 inst->copy_range = 0;
255 case NFULNL_COPY_PACKET:
256 inst->copy_mode = mode;
257 /* we're using struct nfattr which has 16bit nfa_len */
259 inst->copy_range = 0xffff;
261 inst->copy_range = range;
269 spin_unlock_bh(&inst->lock);
275 nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
279 spin_lock_bh(&inst->lock);
280 if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
282 else if (nlbufsiz > 131072)
285 inst->nlbufsiz = nlbufsiz;
288 spin_unlock_bh(&inst->lock);
294 nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
296 spin_lock_bh(&inst->lock);
297 inst->flushtimeout = timeout;
298 spin_unlock_bh(&inst->lock);
304 nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
306 spin_lock_bh(&inst->lock);
307 inst->qthreshold = qthresh;
308 spin_unlock_bh(&inst->lock);
313 static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size,
314 unsigned int pkt_size)
319 UDEBUG("entered (%u, %u)\n", inst_size, pkt_size);
321 /* alloc skb which should be big enough for a whole multipart
322 * message. WARNING: has to be <= 128k due to slab restrictions */
324 n = max(inst_size, pkt_size);
325 skb = alloc_skb(n, GFP_ATOMIC);
327 PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n",
331 /* try to allocate only as much as we need for current
334 skb = alloc_skb(pkt_size, GFP_ATOMIC);
336 PRINTR("nfnetlink_log: can't even alloc %u "
337 "bytes\n", pkt_size);
345 __nfulnl_send(struct nfulnl_instance *inst)
349 if (timer_pending(&inst->timer))
350 del_timer(&inst->timer);
356 inst->lastnlh->nlmsg_type = NLMSG_DONE;
361 status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT);
363 UDEBUG("netlink_unicast() failed\n");
364 /* FIXME: statistics */
369 inst->lastnlh = NULL;
374 static void nfulnl_timer(unsigned long data)
376 struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
378 UDEBUG("timer function called, flushing buffer\n");
380 spin_lock_bh(&inst->lock);
383 spin_unlock_bh(&inst->lock);
387 __build_packet_message(struct nfulnl_instance *inst,
388 const struct sk_buff *skb,
389 unsigned int data_len,
391 unsigned int hooknum,
392 const struct net_device *indev,
393 const struct net_device *outdev,
394 const struct nf_loginfo *li,
397 unsigned char *old_tail;
398 struct nfulnl_msg_packet_hdr pmsg;
399 struct nlmsghdr *nlh;
400 struct nfgenmsg *nfmsg;
405 old_tail = inst->skb->tail;
406 nlh = NLMSG_PUT(inst->skb, 0, 0,
407 NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
408 sizeof(struct nfgenmsg));
409 nfmsg = NLMSG_DATA(nlh);
410 nfmsg->nfgen_family = pf;
411 nfmsg->version = NFNETLINK_V0;
412 nfmsg->res_id = htons(inst->group_num);
414 pmsg.hw_protocol = htons(skb->protocol);
417 NFA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg);
420 int slen = strlen(prefix);
421 if (slen > NFULNL_PREFIXLEN)
422 slen = NFULNL_PREFIXLEN;
423 NFA_PUT(inst->skb, NFULA_PREFIX, slen, prefix);
427 tmp_uint = htonl(indev->ifindex);
428 #ifndef CONFIG_BRIDGE_NETFILTER
429 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint),
432 if (pf == PF_BRIDGE) {
433 /* Case 1: outdev is physical input device, we need to
434 * look for bridge group (when called from
435 * netfilter_bridge) */
436 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
437 sizeof(tmp_uint), &tmp_uint);
438 /* this is the bridge group "brX" */
439 tmp_uint = htonl(indev->br_port->br->dev->ifindex);
440 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
441 sizeof(tmp_uint), &tmp_uint);
443 /* Case 2: indev is bridge group, we need to look for
444 * physical device (when called from ipv4) */
445 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
446 sizeof(tmp_uint), &tmp_uint);
447 if (skb->nf_bridge && skb->nf_bridge->physindev) {
449 htonl(skb->nf_bridge->physindev->ifindex);
450 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
451 sizeof(tmp_uint), &tmp_uint);
458 tmp_uint = htonl(outdev->ifindex);
459 #ifndef CONFIG_BRIDGE_NETFILTER
460 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint),
463 if (pf == PF_BRIDGE) {
464 /* Case 1: outdev is physical output device, we need to
465 * look for bridge group (when called from
466 * netfilter_bridge) */
467 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
468 sizeof(tmp_uint), &tmp_uint);
469 /* this is the bridge group "brX" */
470 tmp_uint = htonl(outdev->br_port->br->dev->ifindex);
471 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
472 sizeof(tmp_uint), &tmp_uint);
474 /* Case 2: indev is a bridge group, we need to look
475 * for physical device (when called from ipv4) */
476 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
477 sizeof(tmp_uint), &tmp_uint);
478 if (skb->nf_bridge) {
480 htonl(skb->nf_bridge->physoutdev->ifindex);
481 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
482 sizeof(tmp_uint), &tmp_uint);
489 tmp_uint = htonl(skb->nfmark);
490 NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint);
493 if (indev && skb->dev && skb->dev->hard_header_parse) {
494 struct nfulnl_msg_packet_hw phw;
497 skb->dev->hard_header_parse((struct sk_buff *)skb,
499 phw.hw_addrlen = htons(phw.hw_addrlen);
500 NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw);
503 if (skb->tstamp.off_sec) {
504 struct nfulnl_msg_packet_timestamp ts;
506 ts.sec = cpu_to_be64(skb->tstamp.off_sec);
507 ts.usec = cpu_to_be64(skb->tstamp.off_usec);
509 NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts);
514 read_lock_bh(&skb->sk->sk_callback_lock);
515 if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
516 u_int32_t uid = htonl(skb->sk->sk_socket->file->f_uid);
517 /* need to unlock here since NFA_PUT may goto */
518 read_unlock_bh(&skb->sk->sk_callback_lock);
519 NFA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid);
521 read_unlock_bh(&skb->sk->sk_callback_lock);
526 int size = NFA_LENGTH(data_len);
528 if (skb_tailroom(inst->skb) < (int)NFA_SPACE(data_len)) {
529 printk(KERN_WARNING "nfnetlink_log: no tailroom!\n");
533 nfa = (struct nfattr *)skb_put(inst->skb, NFA_ALIGN(size));
534 nfa->nfa_type = NFULA_PAYLOAD;
537 if (skb_copy_bits(skb, 0, NFA_DATA(nfa), data_len))
541 nlh->nlmsg_len = inst->skb->tail - old_tail;
545 UDEBUG("nlmsg_failure\n");
547 PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
551 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
553 static struct nf_loginfo default_loginfo = {
554 .type = NF_LOG_TYPE_ULOG,
564 /* log handler for internal netfilter logging api */
566 nfulnl_log_packet(unsigned int pf,
567 unsigned int hooknum,
568 const struct sk_buff *skb,
569 const struct net_device *in,
570 const struct net_device *out,
571 const struct nf_loginfo *li_user,
574 unsigned int size, data_len;
575 struct nfulnl_instance *inst;
576 const struct nf_loginfo *li;
577 unsigned int qthreshold;
578 unsigned int nlbufsiz;
580 if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
583 li = &default_loginfo;
585 inst = instance_lookup_get(li->u.ulog.group);
587 inst = instance_lookup_get(0);
589 PRINTR("nfnetlink_log: trying to log packet, "
590 "but no instance for group %u\n", li->u.ulog.group);
594 /* all macros expand to constant values at compile time */
595 /* FIXME: do we want to make the size calculation conditional based on
596 * what is actually present? way more branches and checks, but more
597 * memory efficient... */
598 size = NLMSG_SPACE(sizeof(struct nfgenmsg))
599 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr))
600 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
601 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
602 #ifdef CONFIG_BRIDGE_NETFILTER
603 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
604 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
606 + NFA_SPACE(sizeof(u_int32_t)) /* mark */
607 + NFA_SPACE(sizeof(u_int32_t)) /* uid */
608 + NFA_SPACE(NFULNL_PREFIXLEN) /* prefix */
609 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw))
610 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp));
612 UDEBUG("initial size=%u\n", size);
614 spin_lock_bh(&inst->lock);
616 qthreshold = inst->qthreshold;
617 /* per-rule qthreshold overrides per-instance */
618 if (qthreshold > li->u.ulog.qthreshold)
619 qthreshold = li->u.ulog.qthreshold;
621 switch (inst->copy_mode) {
622 case NFULNL_COPY_META:
623 case NFULNL_COPY_NONE:
627 case NFULNL_COPY_PACKET:
628 if (inst->copy_range == 0
629 || inst->copy_range > skb->len)
632 data_len = inst->copy_range;
634 size += NFA_SPACE(data_len);
635 UDEBUG("copy_packet, therefore size now %u\n", size);
639 spin_unlock_bh(&inst->lock);
644 if (size > inst->nlbufsiz)
647 nlbufsiz = inst->nlbufsiz;
650 if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) {
651 UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n",
652 inst->nlbufsiz, size);
655 } else if (inst->qlen >= qthreshold ||
656 size > skb_tailroom(inst->skb)) {
657 /* either the queue len is too high or we don't have
658 * enough room in the skb left. flush to userspace. */
659 UDEBUG("flushing old skb\n");
663 if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) {
664 UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n",
665 inst->nlbufsiz, size);
670 UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold);
673 __build_packet_message(inst, skb, data_len, pf,
674 hooknum, in, out, li, prefix);
676 /* timer_pending always called within inst->lock, so there
677 * is no chance of a race here */
678 if (!timer_pending(&inst->timer)) {
680 inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
681 add_timer(&inst->timer);
683 spin_unlock_bh(&inst->lock);
688 spin_unlock_bh(&inst->lock);
690 UDEBUG("error allocating skb\n");
691 /* FIXME: statistics */
695 nfulnl_rcv_nl_event(struct notifier_block *this,
696 unsigned long event, void *ptr)
698 struct netlink_notify *n = ptr;
700 if (event == NETLINK_URELEASE &&
701 n->protocol == NETLINK_NETFILTER && n->pid) {
704 /* destroy all instances for this pid */
705 write_lock_bh(&instances_lock);
706 for (i = 0; i < INSTANCE_BUCKETS; i++) {
707 struct hlist_node *tmp, *t2;
708 struct nfulnl_instance *inst;
709 struct hlist_head *head = &instance_table[i];
711 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
712 UDEBUG("node = %p\n", inst);
713 if (n->pid == inst->peer_pid)
714 __instance_destroy(inst);
717 write_unlock_bh(&instances_lock);
722 static struct notifier_block nfulnl_rtnl_notifier = {
723 .notifier_call = nfulnl_rcv_nl_event,
727 nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
728 struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp)
733 static struct nf_logger nfulnl_logger = {
734 .name = "nfnetlink_log",
735 .logfn = &nfulnl_log_packet,
739 static const int nfula_min[NFULA_MAX] = {
740 [NFULA_PACKET_HDR-1] = sizeof(struct nfulnl_msg_packet_hdr),
741 [NFULA_MARK-1] = sizeof(u_int32_t),
742 [NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp),
743 [NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t),
744 [NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t),
745 [NFULA_HWADDR-1] = sizeof(struct nfulnl_msg_packet_hw),
746 [NFULA_PAYLOAD-1] = 0,
747 [NFULA_PREFIX-1] = 0,
748 [NFULA_UID-1] = sizeof(u_int32_t),
751 static const int nfula_cfg_min[NFULA_CFG_MAX] = {
752 [NFULA_CFG_CMD-1] = sizeof(struct nfulnl_msg_config_cmd),
753 [NFULA_CFG_MODE-1] = sizeof(struct nfulnl_msg_config_mode),
754 [NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t),
755 [NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t),
756 [NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t),
760 nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
761 struct nlmsghdr *nlh, struct nfattr *nfula[], int *errp)
763 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
764 u_int16_t group_num = ntohs(nfmsg->res_id);
765 struct nfulnl_instance *inst;
768 UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type));
770 if (nfattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) {
771 UDEBUG("bad attribute size\n");
775 inst = instance_lookup_get(group_num);
776 if (nfula[NFULA_CFG_CMD-1]) {
777 u_int8_t pf = nfmsg->nfgen_family;
778 struct nfulnl_msg_config_cmd *cmd;
779 cmd = NFA_DATA(nfula[NFULA_CFG_CMD-1]);
780 UDEBUG("found CFG_CMD for\n");
782 switch (cmd->command) {
783 case NFULNL_CFG_CMD_BIND:
789 inst = instance_create(group_num,
790 NETLINK_CB(skb).pid);
796 case NFULNL_CFG_CMD_UNBIND:
802 if (inst->peer_pid != NETLINK_CB(skb).pid) {
807 instance_destroy(inst);
809 case NFULNL_CFG_CMD_PF_BIND:
810 UDEBUG("registering log handler for pf=%u\n", pf);
811 ret = nf_log_register(pf, &nfulnl_logger);
813 case NFULNL_CFG_CMD_PF_UNBIND:
814 UDEBUG("unregistering log handler for pf=%u\n", pf);
815 /* This is a bug and a feature. We cannot unregister
816 * other handlers, like nfnetlink_inst can */
817 nf_log_unregister_pf(pf);
825 UDEBUG("no config command, and no instance for "
826 "group=%u pid=%u =>ENOENT\n",
827 group_num, NETLINK_CB(skb).pid);
832 if (inst->peer_pid != NETLINK_CB(skb).pid) {
833 UDEBUG("no config command, and wrong pid\n");
839 if (nfula[NFULA_CFG_MODE-1]) {
840 struct nfulnl_msg_config_mode *params;
841 params = NFA_DATA(nfula[NFULA_CFG_MODE-1]);
843 nfulnl_set_mode(inst, params->copy_mode,
844 ntohs(params->copy_range));
847 if (nfula[NFULA_CFG_TIMEOUT-1]) {
849 *(u_int32_t *)NFA_DATA(nfula[NFULA_CFG_TIMEOUT-1]);
851 nfulnl_set_timeout(inst, ntohl(timeout));
854 if (nfula[NFULA_CFG_NLBUFSIZ-1]) {
856 *(u_int32_t *)NFA_DATA(nfula[NFULA_CFG_NLBUFSIZ-1]);
858 nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
861 if (nfula[NFULA_CFG_QTHRESH-1]) {
863 *(u_int16_t *)NFA_DATA(nfula[NFULA_CFG_QTHRESH-1]);
865 nfulnl_set_qthresh(inst, ntohl(qthresh));
873 static struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
874 [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
875 .attr_count = NFULA_MAX, },
876 [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
877 .attr_count = NFULA_CFG_MAX, },
880 static struct nfnetlink_subsystem nfulnl_subsys = {
882 .subsys_id = NFNL_SUBSYS_ULOG,
883 .cb_count = NFULNL_MSG_MAX,
887 #ifdef CONFIG_PROC_FS
892 static struct hlist_node *get_first(struct seq_file *seq)
894 struct iter_state *st = seq->private;
899 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
900 if (!hlist_empty(&instance_table[st->bucket]))
901 return instance_table[st->bucket].first;
906 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
908 struct iter_state *st = seq->private;
912 if (++st->bucket >= INSTANCE_BUCKETS)
915 h = instance_table[st->bucket].first;
920 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
922 struct hlist_node *head;
923 head = get_first(seq);
926 while (pos && (head = get_next(seq, head)))
928 return pos ? NULL : head;
931 static void *seq_start(struct seq_file *seq, loff_t *pos)
933 read_lock_bh(&instances_lock);
934 return get_idx(seq, *pos);
937 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
940 return get_next(s, v);
943 static void seq_stop(struct seq_file *s, void *v)
945 read_unlock_bh(&instances_lock);
948 static int seq_show(struct seq_file *s, void *v)
950 const struct nfulnl_instance *inst = v;
952 return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
954 inst->peer_pid, inst->qlen,
955 inst->copy_mode, inst->copy_range,
956 inst->flushtimeout, atomic_read(&inst->use));
959 static struct seq_operations nful_seq_ops = {
966 static int nful_open(struct inode *inode, struct file *file)
968 struct seq_file *seq;
969 struct iter_state *is;
972 is = kzalloc(sizeof(*is), GFP_KERNEL);
975 ret = seq_open(file, &nful_seq_ops);
978 seq = file->private_data;
986 static struct file_operations nful_file_ops = {
987 .owner = THIS_MODULE,
991 .release = seq_release_private,
997 init_or_cleanup(int init)
999 int i, status = -ENOMEM;
1000 #ifdef CONFIG_PROC_FS
1001 struct proc_dir_entry *proc_nful;
1007 for (i = 0; i < INSTANCE_BUCKETS; i++)
1008 INIT_HLIST_HEAD(&instance_table[i]);
1010 /* it's not really all that important to have a random value, so
1011 * we can do this from the init function, even if there hasn't
1012 * been that much entropy yet */
1013 get_random_bytes(&hash_init, sizeof(hash_init));
1015 netlink_register_notifier(&nfulnl_rtnl_notifier);
1016 status = nfnetlink_subsys_register(&nfulnl_subsys);
1018 printk(KERN_ERR "log: failed to create netlink socket\n");
1019 goto cleanup_netlink_notifier;
1022 #ifdef CONFIG_PROC_FS
1023 proc_nful = create_proc_entry("nfnetlink_log", 0440,
1024 proc_net_netfilter);
1026 goto cleanup_subsys;
1027 proc_nful->proc_fops = &nful_file_ops;
1033 nf_log_unregister_logger(&nfulnl_logger);
1034 #ifdef CONFIG_PROC_FS
1035 remove_proc_entry("nfnetlink_log", proc_net_netfilter);
1038 nfnetlink_subsys_unregister(&nfulnl_subsys);
1039 cleanup_netlink_notifier:
1040 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1044 static int __init init(void)
1047 return init_or_cleanup(1);
1050 static void __exit fini(void)
1055 MODULE_DESCRIPTION("netfilter userspace logging");
1056 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1057 MODULE_LICENSE("GPL");
1058 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);