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.
14 #include <linux/module.h>
15 #include <linux/skbuff.h>
16 #include <linux/init.h>
18 #include <linux/ipv6.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter.h>
21 #include <linux/netlink.h>
22 #include <linux/netfilter/nfnetlink.h>
23 #include <linux/netfilter/nfnetlink_log.h>
24 #include <linux/spinlock.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/list.h>
29 #include <linux/jhash.h>
30 #include <linux/random.h>
33 #include <asm/atomic.h>
35 #ifdef CONFIG_BRIDGE_NETFILTER
36 #include "../bridge/br_private.h"
39 #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
40 #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
41 #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
43 #define PRINTR(x, args...) do { if (net_ratelimit()) \
44 printk(x, ## args); } while (0);
47 #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \
48 __FILE__, __LINE__, __FUNCTION__, \
51 #define UDEBUG(x, ...)
54 struct nfulnl_instance {
55 struct hlist_node hlist; /* global list of instances */
57 atomic_t use; /* use count */
59 unsigned int qlen; /* number of nlmsgs in skb */
60 struct sk_buff *skb; /* pre-allocatd skb */
61 struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */
62 struct timer_list timer;
63 int peer_pid; /* PID of the peer process */
65 /* configurable parameters */
66 unsigned int flushtimeout; /* timeout until queue flush */
67 unsigned int nlbufsiz; /* netlink buffer allocation size */
68 unsigned int qthreshold; /* threshold of the queue */
70 u_int32_t seq; /* instance-local sequential counter */
71 u_int16_t group_num; /* number of this queue */
76 static DEFINE_RWLOCK(instances_lock);
77 static atomic_t global_seq;
79 #define INSTANCE_BUCKETS 16
80 static struct hlist_head instance_table[INSTANCE_BUCKETS];
81 static unsigned int hash_init;
83 static inline u_int8_t instance_hashfn(u_int16_t group_num)
85 return ((group_num & 0xff) % INSTANCE_BUCKETS);
88 static struct nfulnl_instance *
89 __instance_lookup(u_int16_t group_num)
91 struct hlist_head *head;
92 struct hlist_node *pos;
93 struct nfulnl_instance *inst;
95 UDEBUG("entering (group_num=%u)\n", group_num);
97 head = &instance_table[instance_hashfn(group_num)];
98 hlist_for_each_entry(inst, pos, head, hlist) {
99 if (inst->group_num == group_num)
106 instance_get(struct nfulnl_instance *inst)
108 atomic_inc(&inst->use);
111 static struct nfulnl_instance *
112 instance_lookup_get(u_int16_t group_num)
114 struct nfulnl_instance *inst;
116 read_lock_bh(&instances_lock);
117 inst = __instance_lookup(group_num);
120 read_unlock_bh(&instances_lock);
126 instance_put(struct nfulnl_instance *inst)
128 if (inst && atomic_dec_and_test(&inst->use)) {
129 UDEBUG("kfree(inst=%p)\n", inst);
131 module_put(THIS_MODULE);
135 static void nfulnl_timer(unsigned long data);
137 static struct nfulnl_instance *
138 instance_create(u_int16_t group_num, int pid)
140 struct nfulnl_instance *inst;
142 UDEBUG("entering (group_num=%u, pid=%d)\n", group_num,
145 write_lock_bh(&instances_lock);
146 if (__instance_lookup(group_num)) {
148 UDEBUG("aborting, instance already exists\n");
152 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
156 INIT_HLIST_NODE(&inst->hlist);
157 spin_lock_init(&inst->lock);
158 /* needs to be two, since we _put() after creation */
159 atomic_set(&inst->use, 2);
161 init_timer(&inst->timer);
162 inst->timer.function = nfulnl_timer;
163 inst->timer.data = (unsigned long)inst;
164 /* don't start timer yet. (re)start it with every packet */
166 inst->peer_pid = pid;
167 inst->group_num = group_num;
169 inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
170 inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
171 inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
172 inst->copy_mode = NFULNL_COPY_PACKET;
173 inst->copy_range = 0xffff;
175 if (!try_module_get(THIS_MODULE))
178 hlist_add_head(&inst->hlist,
179 &instance_table[instance_hashfn(group_num)]);
181 UDEBUG("newly added node: %p, next=%p\n", &inst->hlist,
184 write_unlock_bh(&instances_lock);
191 write_unlock_bh(&instances_lock);
195 static int __nfulnl_send(struct nfulnl_instance *inst);
198 __instance_destroy(struct nfulnl_instance *inst)
200 /* first pull it out of the global list */
201 UDEBUG("removing instance %p (queuenum=%u) from hash\n",
202 inst, inst->group_num);
204 hlist_del(&inst->hlist);
206 /* then flush all pending packets from skb */
208 spin_lock_bh(&inst->lock);
210 /* timer "holds" one reference (we have one more) */
211 if (del_timer(&inst->timer))
216 kfree_skb(inst->skb);
220 spin_unlock_bh(&inst->lock);
222 /* and finally put the refcount */
227 instance_destroy(struct nfulnl_instance *inst)
229 write_lock_bh(&instances_lock);
230 __instance_destroy(inst);
231 write_unlock_bh(&instances_lock);
235 nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
240 spin_lock_bh(&inst->lock);
243 case NFULNL_COPY_NONE:
244 case NFULNL_COPY_META:
245 inst->copy_mode = mode;
246 inst->copy_range = 0;
249 case NFULNL_COPY_PACKET:
250 inst->copy_mode = mode;
251 /* we're using struct nfattr which has 16bit nfa_len */
253 inst->copy_range = 0xffff;
255 inst->copy_range = range;
263 spin_unlock_bh(&inst->lock);
269 nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
273 spin_lock_bh(&inst->lock);
274 if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
276 else if (nlbufsiz > 131072)
279 inst->nlbufsiz = nlbufsiz;
282 spin_unlock_bh(&inst->lock);
288 nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
290 spin_lock_bh(&inst->lock);
291 inst->flushtimeout = timeout;
292 spin_unlock_bh(&inst->lock);
298 nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
300 spin_lock_bh(&inst->lock);
301 inst->qthreshold = qthresh;
302 spin_unlock_bh(&inst->lock);
308 nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
310 spin_lock_bh(&inst->lock);
312 spin_unlock_bh(&inst->lock);
317 static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size,
318 unsigned int pkt_size)
323 UDEBUG("entered (%u, %u)\n", inst_size, pkt_size);
325 /* alloc skb which should be big enough for a whole multipart
326 * message. WARNING: has to be <= 128k due to slab restrictions */
328 n = max(inst_size, pkt_size);
329 skb = alloc_skb(n, GFP_ATOMIC);
331 PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n",
335 /* try to allocate only as much as we need for current
338 skb = alloc_skb(pkt_size, GFP_ATOMIC);
340 PRINTR("nfnetlink_log: can't even alloc %u "
341 "bytes\n", pkt_size);
349 __nfulnl_send(struct nfulnl_instance *inst)
354 inst->lastnlh->nlmsg_type = NLMSG_DONE;
356 status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT);
358 UDEBUG("netlink_unicast() failed\n");
359 /* FIXME: statistics */
364 inst->lastnlh = NULL;
369 static void nfulnl_timer(unsigned long data)
371 struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
373 UDEBUG("timer function called, flushing buffer\n");
375 spin_lock_bh(&inst->lock);
378 spin_unlock_bh(&inst->lock);
382 /* This is an inline function, we don't really care about a long
383 * list of arguments */
385 __build_packet_message(struct nfulnl_instance *inst,
386 const struct sk_buff *skb,
387 unsigned int data_len,
389 unsigned int hooknum,
390 const struct net_device *indev,
391 const struct net_device *outdev,
392 const struct nf_loginfo *li,
393 const char *prefix, unsigned int plen)
395 struct nfulnl_msg_packet_hdr pmsg;
396 struct nlmsghdr *nlh;
397 struct nfgenmsg *nfmsg;
399 sk_buff_data_t old_tail = inst->skb->tail;
403 nlh = NLMSG_PUT(inst->skb, 0, 0,
404 NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
405 sizeof(struct nfgenmsg));
406 nfmsg = NLMSG_DATA(nlh);
407 nfmsg->nfgen_family = pf;
408 nfmsg->version = NFNETLINK_V0;
409 nfmsg->res_id = htons(inst->group_num);
411 pmsg.hw_protocol = skb->protocol;
414 NFA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg);
417 NFA_PUT(inst->skb, NFULA_PREFIX, plen, prefix);
420 tmp_uint = htonl(indev->ifindex);
421 #ifndef CONFIG_BRIDGE_NETFILTER
422 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint),
425 if (pf == PF_BRIDGE) {
426 /* Case 1: outdev is physical input device, we need to
427 * look for bridge group (when called from
428 * netfilter_bridge) */
429 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
430 sizeof(tmp_uint), &tmp_uint);
431 /* this is the bridge group "brX" */
432 tmp_uint = htonl(indev->br_port->br->dev->ifindex);
433 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
434 sizeof(tmp_uint), &tmp_uint);
436 /* Case 2: indev is bridge group, we need to look for
437 * physical device (when called from ipv4) */
438 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
439 sizeof(tmp_uint), &tmp_uint);
440 if (skb->nf_bridge && skb->nf_bridge->physindev) {
442 htonl(skb->nf_bridge->physindev->ifindex);
443 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
444 sizeof(tmp_uint), &tmp_uint);
451 tmp_uint = htonl(outdev->ifindex);
452 #ifndef CONFIG_BRIDGE_NETFILTER
453 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint),
456 if (pf == PF_BRIDGE) {
457 /* Case 1: outdev is physical output device, we need to
458 * look for bridge group (when called from
459 * netfilter_bridge) */
460 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
461 sizeof(tmp_uint), &tmp_uint);
462 /* this is the bridge group "brX" */
463 tmp_uint = htonl(outdev->br_port->br->dev->ifindex);
464 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
465 sizeof(tmp_uint), &tmp_uint);
467 /* Case 2: indev is a bridge group, we need to look
468 * for physical device (when called from ipv4) */
469 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
470 sizeof(tmp_uint), &tmp_uint);
471 if (skb->nf_bridge && skb->nf_bridge->physoutdev) {
473 htonl(skb->nf_bridge->physoutdev->ifindex);
474 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
475 sizeof(tmp_uint), &tmp_uint);
482 tmp_uint = htonl(skb->mark);
483 NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint);
486 if (indev && skb->dev && skb->dev->hard_header_parse) {
487 struct nfulnl_msg_packet_hw phw;
488 int len = skb->dev->hard_header_parse((struct sk_buff *)skb,
490 phw.hw_addrlen = htons(len);
491 NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw);
494 if (skb->tstamp.tv64) {
495 struct nfulnl_msg_packet_timestamp ts;
496 struct timeval tv = ktime_to_timeval(skb->tstamp);
497 ts.sec = cpu_to_be64(tv.tv_sec);
498 ts.usec = cpu_to_be64(tv.tv_usec);
500 NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts);
505 read_lock_bh(&skb->sk->sk_callback_lock);
506 if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
507 __be32 uid = htonl(skb->sk->sk_socket->file->f_uid);
508 /* need to unlock here since NFA_PUT may goto */
509 read_unlock_bh(&skb->sk->sk_callback_lock);
510 NFA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid);
512 read_unlock_bh(&skb->sk->sk_callback_lock);
515 /* local sequence number */
516 if (inst->flags & NFULNL_CFG_F_SEQ) {
517 tmp_uint = htonl(inst->seq++);
518 NFA_PUT(inst->skb, NFULA_SEQ, sizeof(tmp_uint), &tmp_uint);
520 /* global sequence number */
521 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) {
522 tmp_uint = htonl(atomic_inc_return(&global_seq));
523 NFA_PUT(inst->skb, NFULA_SEQ_GLOBAL, sizeof(tmp_uint), &tmp_uint);
528 int size = NFA_LENGTH(data_len);
530 if (skb_tailroom(inst->skb) < (int)NFA_SPACE(data_len)) {
531 printk(KERN_WARNING "nfnetlink_log: no tailroom!\n");
535 nfa = (struct nfattr *)skb_put(inst->skb, NFA_ALIGN(size));
536 nfa->nfa_type = NFULA_PAYLOAD;
539 if (skb_copy_bits(skb, 0, NFA_DATA(nfa), data_len))
543 nlh->nlmsg_len = inst->skb->tail - old_tail;
548 UDEBUG("nlmsg_failure\n");
550 PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
554 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
556 static struct nf_loginfo default_loginfo = {
557 .type = NF_LOG_TYPE_ULOG,
567 /* log handler for internal netfilter logging api */
569 nfulnl_log_packet(unsigned int pf,
570 unsigned int hooknum,
571 const struct sk_buff *skb,
572 const struct net_device *in,
573 const struct net_device *out,
574 const struct nf_loginfo *li_user,
577 unsigned int size, data_len;
578 struct nfulnl_instance *inst;
579 const struct nf_loginfo *li;
580 unsigned int qthreshold;
583 if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
586 li = &default_loginfo;
588 inst = instance_lookup_get(li->u.ulog.group);
590 inst = instance_lookup_get(0);
592 PRINTR("nfnetlink_log: trying to log packet, "
593 "but no instance for group %u\n", li->u.ulog.group);
599 plen = strlen(prefix) + 1;
601 /* all macros expand to constant values at compile time */
602 /* FIXME: do we want to make the size calculation conditional based on
603 * what is actually present? way more branches and checks, but more
604 * memory efficient... */
605 size = NLMSG_SPACE(sizeof(struct nfgenmsg))
606 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr))
607 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
608 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
609 #ifdef CONFIG_BRIDGE_NETFILTER
610 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
611 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
613 + NFA_SPACE(sizeof(u_int32_t)) /* mark */
614 + NFA_SPACE(sizeof(u_int32_t)) /* uid */
615 + NFA_SPACE(plen) /* prefix */
616 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw))
617 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp));
619 UDEBUG("initial size=%u\n", size);
621 spin_lock_bh(&inst->lock);
623 if (inst->flags & NFULNL_CFG_F_SEQ)
624 size += NFA_SPACE(sizeof(u_int32_t));
625 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
626 size += NFA_SPACE(sizeof(u_int32_t));
628 qthreshold = inst->qthreshold;
629 /* per-rule qthreshold overrides per-instance */
630 if (qthreshold > li->u.ulog.qthreshold)
631 qthreshold = li->u.ulog.qthreshold;
633 switch (inst->copy_mode) {
634 case NFULNL_COPY_META:
635 case NFULNL_COPY_NONE:
639 case NFULNL_COPY_PACKET:
640 if (inst->copy_range == 0
641 || inst->copy_range > skb->len)
644 data_len = inst->copy_range;
646 size += NFA_SPACE(data_len);
647 UDEBUG("copy_packet, therefore size now %u\n", size);
651 goto unlock_and_release;
654 if (inst->qlen >= qthreshold ||
655 (inst->skb && size > skb_tailroom(inst->skb))) {
656 /* either the queue len is too high or we don't have
657 * enough room in the skb left. flush to userspace. */
658 UDEBUG("flushing old skb\n");
660 /* timer "holds" one reference (we have another one) */
661 if (del_timer(&inst->timer))
667 inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size);
672 UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold);
675 __build_packet_message(inst, skb, data_len, pf,
676 hooknum, in, out, li, prefix, plen);
678 /* timer_pending always called within inst->lock, so there
679 * is no chance of a race here */
680 if (!timer_pending(&inst->timer)) {
682 inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
683 add_timer(&inst->timer);
687 spin_unlock_bh(&inst->lock);
692 UDEBUG("error allocating skb\n");
693 /* FIXME: statistics */
694 goto unlock_and_release;
698 nfulnl_rcv_nl_event(struct notifier_block *this,
699 unsigned long event, void *ptr)
701 struct netlink_notify *n = ptr;
703 if (event == NETLINK_URELEASE &&
704 n->protocol == NETLINK_NETFILTER && n->pid) {
707 /* destroy all instances for this pid */
708 write_lock_bh(&instances_lock);
709 for (i = 0; i < INSTANCE_BUCKETS; i++) {
710 struct hlist_node *tmp, *t2;
711 struct nfulnl_instance *inst;
712 struct hlist_head *head = &instance_table[i];
714 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
715 UDEBUG("node = %p\n", inst);
716 if (n->pid == inst->peer_pid)
717 __instance_destroy(inst);
720 write_unlock_bh(&instances_lock);
725 static struct notifier_block nfulnl_rtnl_notifier = {
726 .notifier_call = nfulnl_rcv_nl_event,
730 nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
731 struct nlmsghdr *nlh, struct nfattr *nfqa[])
736 static struct nf_logger nfulnl_logger = {
737 .name = "nfnetlink_log",
738 .logfn = &nfulnl_log_packet,
742 static const int nfula_min[NFULA_MAX] = {
743 [NFULA_PACKET_HDR-1] = sizeof(struct nfulnl_msg_packet_hdr),
744 [NFULA_MARK-1] = sizeof(u_int32_t),
745 [NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp),
746 [NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t),
747 [NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t),
748 [NFULA_IFINDEX_PHYSINDEV-1] = sizeof(u_int32_t),
749 [NFULA_IFINDEX_PHYSOUTDEV-1] = sizeof(u_int32_t),
750 [NFULA_HWADDR-1] = sizeof(struct nfulnl_msg_packet_hw),
751 [NFULA_PAYLOAD-1] = 0,
752 [NFULA_PREFIX-1] = 0,
753 [NFULA_UID-1] = sizeof(u_int32_t),
754 [NFULA_SEQ-1] = sizeof(u_int32_t),
755 [NFULA_SEQ_GLOBAL-1] = sizeof(u_int32_t),
758 static const int nfula_cfg_min[NFULA_CFG_MAX] = {
759 [NFULA_CFG_CMD-1] = sizeof(struct nfulnl_msg_config_cmd),
760 [NFULA_CFG_MODE-1] = sizeof(struct nfulnl_msg_config_mode),
761 [NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t),
762 [NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t),
763 [NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t),
764 [NFULA_CFG_FLAGS-1] = sizeof(u_int16_t),
768 nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
769 struct nlmsghdr *nlh, struct nfattr *nfula[])
771 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
772 u_int16_t group_num = ntohs(nfmsg->res_id);
773 struct nfulnl_instance *inst;
776 UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type));
778 if (nfattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) {
779 UDEBUG("bad attribute size\n");
783 inst = instance_lookup_get(group_num);
784 if (nfula[NFULA_CFG_CMD-1]) {
785 u_int8_t pf = nfmsg->nfgen_family;
786 struct nfulnl_msg_config_cmd *cmd;
787 cmd = NFA_DATA(nfula[NFULA_CFG_CMD-1]);
788 UDEBUG("found CFG_CMD for\n");
790 switch (cmd->command) {
791 case NFULNL_CFG_CMD_BIND:
797 inst = instance_create(group_num,
798 NETLINK_CB(skb).pid);
804 case NFULNL_CFG_CMD_UNBIND:
810 if (inst->peer_pid != NETLINK_CB(skb).pid) {
815 instance_destroy(inst);
817 case NFULNL_CFG_CMD_PF_BIND:
818 UDEBUG("registering log handler for pf=%u\n", pf);
819 ret = nf_log_register(pf, &nfulnl_logger);
821 case NFULNL_CFG_CMD_PF_UNBIND:
822 UDEBUG("unregistering log handler for pf=%u\n", pf);
823 /* This is a bug and a feature. We cannot unregister
824 * other handlers, like nfnetlink_inst can */
825 nf_log_unregister_pf(pf);
836 UDEBUG("no config command, and no instance for "
837 "group=%u pid=%u =>ENOENT\n",
838 group_num, NETLINK_CB(skb).pid);
843 if (inst->peer_pid != NETLINK_CB(skb).pid) {
844 UDEBUG("no config command, and wrong pid\n");
850 if (nfula[NFULA_CFG_MODE-1]) {
851 struct nfulnl_msg_config_mode *params;
852 params = NFA_DATA(nfula[NFULA_CFG_MODE-1]);
854 nfulnl_set_mode(inst, params->copy_mode,
855 ntohl(params->copy_range));
858 if (nfula[NFULA_CFG_TIMEOUT-1]) {
860 *(__be32 *)NFA_DATA(nfula[NFULA_CFG_TIMEOUT-1]);
862 nfulnl_set_timeout(inst, ntohl(timeout));
865 if (nfula[NFULA_CFG_NLBUFSIZ-1]) {
867 *(__be32 *)NFA_DATA(nfula[NFULA_CFG_NLBUFSIZ-1]);
869 nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
872 if (nfula[NFULA_CFG_QTHRESH-1]) {
874 *(__be32 *)NFA_DATA(nfula[NFULA_CFG_QTHRESH-1]);
876 nfulnl_set_qthresh(inst, ntohl(qthresh));
879 if (nfula[NFULA_CFG_FLAGS-1]) {
881 *(__be16 *)NFA_DATA(nfula[NFULA_CFG_FLAGS-1]);
882 nfulnl_set_flags(inst, ntohs(flags));
891 static struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
892 [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
893 .attr_count = NFULA_MAX, },
894 [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
895 .attr_count = NFULA_CFG_MAX, },
898 static struct nfnetlink_subsystem nfulnl_subsys = {
900 .subsys_id = NFNL_SUBSYS_ULOG,
901 .cb_count = NFULNL_MSG_MAX,
905 #ifdef CONFIG_PROC_FS
910 static struct hlist_node *get_first(struct iter_state *st)
915 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
916 if (!hlist_empty(&instance_table[st->bucket]))
917 return instance_table[st->bucket].first;
922 static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h)
926 if (++st->bucket >= INSTANCE_BUCKETS)
929 h = instance_table[st->bucket].first;
934 static struct hlist_node *get_idx(struct iter_state *st, loff_t pos)
936 struct hlist_node *head;
937 head = get_first(st);
940 while (pos && (head = get_next(st, head)))
942 return pos ? NULL : head;
945 static void *seq_start(struct seq_file *seq, loff_t *pos)
947 read_lock_bh(&instances_lock);
948 return get_idx(seq->private, *pos);
951 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
954 return get_next(s->private, v);
957 static void seq_stop(struct seq_file *s, void *v)
959 read_unlock_bh(&instances_lock);
962 static int seq_show(struct seq_file *s, void *v)
964 const struct nfulnl_instance *inst = v;
966 return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
968 inst->peer_pid, inst->qlen,
969 inst->copy_mode, inst->copy_range,
970 inst->flushtimeout, atomic_read(&inst->use));
973 static struct seq_operations nful_seq_ops = {
980 static int nful_open(struct inode *inode, struct file *file)
982 struct seq_file *seq;
983 struct iter_state *is;
986 is = kzalloc(sizeof(*is), GFP_KERNEL);
989 ret = seq_open(file, &nful_seq_ops);
992 seq = file->private_data;
1000 static const struct file_operations nful_file_ops = {
1001 .owner = THIS_MODULE,
1004 .llseek = seq_lseek,
1005 .release = seq_release_private,
1008 #endif /* PROC_FS */
1010 static int __init nfnetlink_log_init(void)
1012 int i, status = -ENOMEM;
1013 #ifdef CONFIG_PROC_FS
1014 struct proc_dir_entry *proc_nful;
1017 for (i = 0; i < INSTANCE_BUCKETS; i++)
1018 INIT_HLIST_HEAD(&instance_table[i]);
1020 /* it's not really all that important to have a random value, so
1021 * we can do this from the init function, even if there hasn't
1022 * been that much entropy yet */
1023 get_random_bytes(&hash_init, sizeof(hash_init));
1025 netlink_register_notifier(&nfulnl_rtnl_notifier);
1026 status = nfnetlink_subsys_register(&nfulnl_subsys);
1028 printk(KERN_ERR "log: failed to create netlink socket\n");
1029 goto cleanup_netlink_notifier;
1032 #ifdef CONFIG_PROC_FS
1033 proc_nful = create_proc_entry("nfnetlink_log", 0440,
1034 proc_net_netfilter);
1036 goto cleanup_subsys;
1037 proc_nful->proc_fops = &nful_file_ops;
1041 #ifdef CONFIG_PROC_FS
1043 nfnetlink_subsys_unregister(&nfulnl_subsys);
1045 cleanup_netlink_notifier:
1046 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1050 static void __exit nfnetlink_log_fini(void)
1052 nf_log_unregister(&nfulnl_logger);
1053 #ifdef CONFIG_PROC_FS
1054 remove_proc_entry("nfnetlink_log", proc_net_netfilter);
1056 nfnetlink_subsys_unregister(&nfulnl_subsys);
1057 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1060 MODULE_DESCRIPTION("netfilter userspace logging");
1061 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1062 MODULE_LICENSE("GPL");
1063 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
1065 module_init(nfnetlink_log_init);
1066 module_exit(nfnetlink_log_fini);