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_destroy2(struct nfulnl_instance *inst, int lock)
200 /* first pull it out of the global list */
202 write_lock_bh(&instances_lock);
204 UDEBUG("removing instance %p (queuenum=%u) from hash\n",
205 inst, inst->group_num);
207 hlist_del(&inst->hlist);
210 write_unlock_bh(&instances_lock);
212 /* then flush all pending packets from skb */
214 spin_lock_bh(&inst->lock);
216 /* timer "holds" one reference (we have one more) */
217 if (del_timer(&inst->timer))
222 kfree_skb(inst->skb);
226 spin_unlock_bh(&inst->lock);
228 /* and finally put the refcount */
233 __instance_destroy(struct nfulnl_instance *inst)
235 _instance_destroy2(inst, 0);
239 instance_destroy(struct nfulnl_instance *inst)
241 _instance_destroy2(inst, 1);
245 nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
250 spin_lock_bh(&inst->lock);
253 case NFULNL_COPY_NONE:
254 case NFULNL_COPY_META:
255 inst->copy_mode = mode;
256 inst->copy_range = 0;
259 case NFULNL_COPY_PACKET:
260 inst->copy_mode = mode;
261 /* we're using struct nfattr which has 16bit nfa_len */
263 inst->copy_range = 0xffff;
265 inst->copy_range = range;
273 spin_unlock_bh(&inst->lock);
279 nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
283 spin_lock_bh(&inst->lock);
284 if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
286 else if (nlbufsiz > 131072)
289 inst->nlbufsiz = nlbufsiz;
292 spin_unlock_bh(&inst->lock);
298 nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
300 spin_lock_bh(&inst->lock);
301 inst->flushtimeout = timeout;
302 spin_unlock_bh(&inst->lock);
308 nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
310 spin_lock_bh(&inst->lock);
311 inst->qthreshold = qthresh;
312 spin_unlock_bh(&inst->lock);
318 nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
320 spin_lock_bh(&inst->lock);
322 spin_unlock_bh(&inst->lock);
327 static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size,
328 unsigned int pkt_size)
333 UDEBUG("entered (%u, %u)\n", inst_size, pkt_size);
335 /* alloc skb which should be big enough for a whole multipart
336 * message. WARNING: has to be <= 128k due to slab restrictions */
338 n = max(inst_size, pkt_size);
339 skb = alloc_skb(n, GFP_ATOMIC);
341 PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n",
345 /* try to allocate only as much as we need for current
348 skb = alloc_skb(pkt_size, GFP_ATOMIC);
350 PRINTR("nfnetlink_log: can't even alloc %u "
351 "bytes\n", pkt_size);
359 __nfulnl_send(struct nfulnl_instance *inst)
367 inst->lastnlh->nlmsg_type = NLMSG_DONE;
369 status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT);
371 UDEBUG("netlink_unicast() failed\n");
372 /* FIXME: statistics */
377 inst->lastnlh = NULL;
382 static void nfulnl_timer(unsigned long data)
384 struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
386 UDEBUG("timer function called, flushing buffer\n");
388 spin_lock_bh(&inst->lock);
390 spin_unlock_bh(&inst->lock);
394 /* This is an inline function, we don't really care about a long
395 * list of arguments */
397 __build_packet_message(struct nfulnl_instance *inst,
398 const struct sk_buff *skb,
399 unsigned int data_len,
401 unsigned int hooknum,
402 const struct net_device *indev,
403 const struct net_device *outdev,
404 const struct nf_loginfo *li,
405 const char *prefix, unsigned int plen)
407 struct nfulnl_msg_packet_hdr pmsg;
408 struct nlmsghdr *nlh;
409 struct nfgenmsg *nfmsg;
411 sk_buff_data_t old_tail = inst->skb->tail;
415 nlh = NLMSG_PUT(inst->skb, 0, 0,
416 NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
417 sizeof(struct nfgenmsg));
418 nfmsg = NLMSG_DATA(nlh);
419 nfmsg->nfgen_family = pf;
420 nfmsg->version = NFNETLINK_V0;
421 nfmsg->res_id = htons(inst->group_num);
423 pmsg.hw_protocol = skb->protocol;
426 NFA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg);
429 NFA_PUT(inst->skb, NFULA_PREFIX, plen, prefix);
432 tmp_uint = htonl(indev->ifindex);
433 #ifndef CONFIG_BRIDGE_NETFILTER
434 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint),
437 if (pf == PF_BRIDGE) {
438 /* Case 1: outdev is physical input device, we need to
439 * look for bridge group (when called from
440 * netfilter_bridge) */
441 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
442 sizeof(tmp_uint), &tmp_uint);
443 /* this is the bridge group "brX" */
444 tmp_uint = htonl(indev->br_port->br->dev->ifindex);
445 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
446 sizeof(tmp_uint), &tmp_uint);
448 /* Case 2: indev is bridge group, we need to look for
449 * physical device (when called from ipv4) */
450 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
451 sizeof(tmp_uint), &tmp_uint);
452 if (skb->nf_bridge && skb->nf_bridge->physindev) {
454 htonl(skb->nf_bridge->physindev->ifindex);
455 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
456 sizeof(tmp_uint), &tmp_uint);
463 tmp_uint = htonl(outdev->ifindex);
464 #ifndef CONFIG_BRIDGE_NETFILTER
465 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint),
468 if (pf == PF_BRIDGE) {
469 /* Case 1: outdev is physical output device, we need to
470 * look for bridge group (when called from
471 * netfilter_bridge) */
472 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
473 sizeof(tmp_uint), &tmp_uint);
474 /* this is the bridge group "brX" */
475 tmp_uint = htonl(outdev->br_port->br->dev->ifindex);
476 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
477 sizeof(tmp_uint), &tmp_uint);
479 /* Case 2: indev is a bridge group, we need to look
480 * for physical device (when called from ipv4) */
481 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
482 sizeof(tmp_uint), &tmp_uint);
483 if (skb->nf_bridge && skb->nf_bridge->physoutdev) {
485 htonl(skb->nf_bridge->physoutdev->ifindex);
486 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
487 sizeof(tmp_uint), &tmp_uint);
494 tmp_uint = htonl(skb->mark);
495 NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint);
498 if (indev && skb->dev && skb->dev->hard_header_parse) {
499 struct nfulnl_msg_packet_hw phw;
500 int len = skb->dev->hard_header_parse((struct sk_buff *)skb,
502 phw.hw_addrlen = htons(len);
503 NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw);
506 if (skb->tstamp.tv64) {
507 struct nfulnl_msg_packet_timestamp ts;
508 struct timeval tv = ktime_to_timeval(skb->tstamp);
509 ts.sec = cpu_to_be64(tv.tv_sec);
510 ts.usec = cpu_to_be64(tv.tv_usec);
512 NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts);
517 read_lock_bh(&skb->sk->sk_callback_lock);
518 if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
519 __be32 uid = htonl(skb->sk->sk_socket->file->f_uid);
520 /* need to unlock here since NFA_PUT may goto */
521 read_unlock_bh(&skb->sk->sk_callback_lock);
522 NFA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid);
524 read_unlock_bh(&skb->sk->sk_callback_lock);
527 /* local sequence number */
528 if (inst->flags & NFULNL_CFG_F_SEQ) {
529 tmp_uint = htonl(inst->seq++);
530 NFA_PUT(inst->skb, NFULA_SEQ, sizeof(tmp_uint), &tmp_uint);
532 /* global sequence number */
533 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) {
534 tmp_uint = htonl(atomic_inc_return(&global_seq));
535 NFA_PUT(inst->skb, NFULA_SEQ_GLOBAL, sizeof(tmp_uint), &tmp_uint);
540 int size = NFA_LENGTH(data_len);
542 if (skb_tailroom(inst->skb) < (int)NFA_SPACE(data_len)) {
543 printk(KERN_WARNING "nfnetlink_log: no tailroom!\n");
547 nfa = (struct nfattr *)skb_put(inst->skb, NFA_ALIGN(size));
548 nfa->nfa_type = NFULA_PAYLOAD;
551 if (skb_copy_bits(skb, 0, NFA_DATA(nfa), data_len))
555 nlh->nlmsg_len = inst->skb->tail - old_tail;
560 UDEBUG("nlmsg_failure\n");
562 PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
566 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
568 static struct nf_loginfo default_loginfo = {
569 .type = NF_LOG_TYPE_ULOG,
579 /* log handler for internal netfilter logging api */
581 nfulnl_log_packet(unsigned int pf,
582 unsigned int hooknum,
583 const struct sk_buff *skb,
584 const struct net_device *in,
585 const struct net_device *out,
586 const struct nf_loginfo *li_user,
589 unsigned int size, data_len;
590 struct nfulnl_instance *inst;
591 const struct nf_loginfo *li;
592 unsigned int qthreshold;
595 if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
598 li = &default_loginfo;
600 inst = instance_lookup_get(li->u.ulog.group);
602 inst = instance_lookup_get(0);
604 PRINTR("nfnetlink_log: trying to log packet, "
605 "but no instance for group %u\n", li->u.ulog.group);
611 plen = strlen(prefix) + 1;
613 /* all macros expand to constant values at compile time */
614 /* FIXME: do we want to make the size calculation conditional based on
615 * what is actually present? way more branches and checks, but more
616 * memory efficient... */
617 size = NLMSG_SPACE(sizeof(struct nfgenmsg))
618 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr))
619 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
620 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
621 #ifdef CONFIG_BRIDGE_NETFILTER
622 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
623 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
625 + NFA_SPACE(sizeof(u_int32_t)) /* mark */
626 + NFA_SPACE(sizeof(u_int32_t)) /* uid */
627 + NFA_SPACE(plen) /* prefix */
628 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw))
629 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp));
631 UDEBUG("initial size=%u\n", size);
633 spin_lock_bh(&inst->lock);
635 if (inst->flags & NFULNL_CFG_F_SEQ)
636 size += NFA_SPACE(sizeof(u_int32_t));
637 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
638 size += NFA_SPACE(sizeof(u_int32_t));
640 qthreshold = inst->qthreshold;
641 /* per-rule qthreshold overrides per-instance */
642 if (qthreshold > li->u.ulog.qthreshold)
643 qthreshold = li->u.ulog.qthreshold;
645 switch (inst->copy_mode) {
646 case NFULNL_COPY_META:
647 case NFULNL_COPY_NONE:
651 case NFULNL_COPY_PACKET:
652 if (inst->copy_range == 0
653 || inst->copy_range > skb->len)
656 data_len = inst->copy_range;
658 size += NFA_SPACE(data_len);
659 UDEBUG("copy_packet, therefore size now %u\n", size);
663 goto unlock_and_release;
666 if (inst->qlen >= qthreshold ||
667 (inst->skb && size > skb_tailroom(inst->skb))) {
668 /* either the queue len is too high or we don't have
669 * enough room in the skb left. flush to userspace. */
670 UDEBUG("flushing old skb\n");
672 /* timer "holds" one reference (we have another one) */
673 if (del_timer(&inst->timer))
679 inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size);
684 UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold);
687 __build_packet_message(inst, skb, data_len, pf,
688 hooknum, in, out, li, prefix, plen);
690 /* timer_pending always called within inst->lock, so there
691 * is no chance of a race here */
692 if (!timer_pending(&inst->timer)) {
694 inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
695 add_timer(&inst->timer);
699 spin_unlock_bh(&inst->lock);
704 UDEBUG("error allocating skb\n");
705 /* FIXME: statistics */
706 goto unlock_and_release;
710 nfulnl_rcv_nl_event(struct notifier_block *this,
711 unsigned long event, void *ptr)
713 struct netlink_notify *n = ptr;
715 if (event == NETLINK_URELEASE &&
716 n->protocol == NETLINK_NETFILTER && n->pid) {
719 /* destroy all instances for this pid */
720 write_lock_bh(&instances_lock);
721 for (i = 0; i < INSTANCE_BUCKETS; i++) {
722 struct hlist_node *tmp, *t2;
723 struct nfulnl_instance *inst;
724 struct hlist_head *head = &instance_table[i];
726 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
727 UDEBUG("node = %p\n", inst);
728 if (n->pid == inst->peer_pid)
729 __instance_destroy(inst);
732 write_unlock_bh(&instances_lock);
737 static struct notifier_block nfulnl_rtnl_notifier = {
738 .notifier_call = nfulnl_rcv_nl_event,
742 nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
743 struct nlmsghdr *nlh, struct nfattr *nfqa[])
748 static struct nf_logger nfulnl_logger = {
749 .name = "nfnetlink_log",
750 .logfn = &nfulnl_log_packet,
754 static const int nfula_min[NFULA_MAX] = {
755 [NFULA_PACKET_HDR-1] = sizeof(struct nfulnl_msg_packet_hdr),
756 [NFULA_MARK-1] = sizeof(u_int32_t),
757 [NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp),
758 [NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t),
759 [NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t),
760 [NFULA_IFINDEX_PHYSINDEV-1] = sizeof(u_int32_t),
761 [NFULA_IFINDEX_PHYSOUTDEV-1] = sizeof(u_int32_t),
762 [NFULA_HWADDR-1] = sizeof(struct nfulnl_msg_packet_hw),
763 [NFULA_PAYLOAD-1] = 0,
764 [NFULA_PREFIX-1] = 0,
765 [NFULA_UID-1] = sizeof(u_int32_t),
766 [NFULA_SEQ-1] = sizeof(u_int32_t),
767 [NFULA_SEQ_GLOBAL-1] = sizeof(u_int32_t),
770 static const int nfula_cfg_min[NFULA_CFG_MAX] = {
771 [NFULA_CFG_CMD-1] = sizeof(struct nfulnl_msg_config_cmd),
772 [NFULA_CFG_MODE-1] = sizeof(struct nfulnl_msg_config_mode),
773 [NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t),
774 [NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t),
775 [NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t),
776 [NFULA_CFG_FLAGS-1] = sizeof(u_int16_t),
780 nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
781 struct nlmsghdr *nlh, struct nfattr *nfula[])
783 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
784 u_int16_t group_num = ntohs(nfmsg->res_id);
785 struct nfulnl_instance *inst;
788 UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type));
790 if (nfattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) {
791 UDEBUG("bad attribute size\n");
795 inst = instance_lookup_get(group_num);
796 if (nfula[NFULA_CFG_CMD-1]) {
797 u_int8_t pf = nfmsg->nfgen_family;
798 struct nfulnl_msg_config_cmd *cmd;
799 cmd = NFA_DATA(nfula[NFULA_CFG_CMD-1]);
800 UDEBUG("found CFG_CMD for\n");
802 switch (cmd->command) {
803 case NFULNL_CFG_CMD_BIND:
809 inst = instance_create(group_num,
810 NETLINK_CB(skb).pid);
816 case NFULNL_CFG_CMD_UNBIND:
822 if (inst->peer_pid != NETLINK_CB(skb).pid) {
827 instance_destroy(inst);
829 case NFULNL_CFG_CMD_PF_BIND:
830 UDEBUG("registering log handler for pf=%u\n", pf);
831 ret = nf_log_register(pf, &nfulnl_logger);
833 case NFULNL_CFG_CMD_PF_UNBIND:
834 UDEBUG("unregistering log handler for pf=%u\n", pf);
835 /* This is a bug and a feature. We cannot unregister
836 * other handlers, like nfnetlink_inst can */
837 nf_log_unregister_pf(pf);
848 UDEBUG("no config command, and no instance for "
849 "group=%u pid=%u =>ENOENT\n",
850 group_num, NETLINK_CB(skb).pid);
855 if (inst->peer_pid != NETLINK_CB(skb).pid) {
856 UDEBUG("no config command, and wrong pid\n");
862 if (nfula[NFULA_CFG_MODE-1]) {
863 struct nfulnl_msg_config_mode *params;
864 params = NFA_DATA(nfula[NFULA_CFG_MODE-1]);
866 nfulnl_set_mode(inst, params->copy_mode,
867 ntohl(params->copy_range));
870 if (nfula[NFULA_CFG_TIMEOUT-1]) {
872 *(__be32 *)NFA_DATA(nfula[NFULA_CFG_TIMEOUT-1]);
874 nfulnl_set_timeout(inst, ntohl(timeout));
877 if (nfula[NFULA_CFG_NLBUFSIZ-1]) {
879 *(__be32 *)NFA_DATA(nfula[NFULA_CFG_NLBUFSIZ-1]);
881 nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
884 if (nfula[NFULA_CFG_QTHRESH-1]) {
886 *(__be32 *)NFA_DATA(nfula[NFULA_CFG_QTHRESH-1]);
888 nfulnl_set_qthresh(inst, ntohl(qthresh));
891 if (nfula[NFULA_CFG_FLAGS-1]) {
893 *(__be16 *)NFA_DATA(nfula[NFULA_CFG_FLAGS-1]);
894 nfulnl_set_flags(inst, ntohs(flags));
903 static struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
904 [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
905 .attr_count = NFULA_MAX, },
906 [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
907 .attr_count = NFULA_CFG_MAX, },
910 static struct nfnetlink_subsystem nfulnl_subsys = {
912 .subsys_id = NFNL_SUBSYS_ULOG,
913 .cb_count = NFULNL_MSG_MAX,
917 #ifdef CONFIG_PROC_FS
922 static struct hlist_node *get_first(struct iter_state *st)
927 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
928 if (!hlist_empty(&instance_table[st->bucket]))
929 return instance_table[st->bucket].first;
934 static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h)
938 if (++st->bucket >= INSTANCE_BUCKETS)
941 h = instance_table[st->bucket].first;
946 static struct hlist_node *get_idx(struct iter_state *st, loff_t pos)
948 struct hlist_node *head;
949 head = get_first(st);
952 while (pos && (head = get_next(st, head)))
954 return pos ? NULL : head;
957 static void *seq_start(struct seq_file *seq, loff_t *pos)
959 read_lock_bh(&instances_lock);
960 return get_idx(seq->private, *pos);
963 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
966 return get_next(s->private, v);
969 static void seq_stop(struct seq_file *s, void *v)
971 read_unlock_bh(&instances_lock);
974 static int seq_show(struct seq_file *s, void *v)
976 const struct nfulnl_instance *inst = v;
978 return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
980 inst->peer_pid, inst->qlen,
981 inst->copy_mode, inst->copy_range,
982 inst->flushtimeout, atomic_read(&inst->use));
985 static struct seq_operations nful_seq_ops = {
992 static int nful_open(struct inode *inode, struct file *file)
994 struct seq_file *seq;
995 struct iter_state *is;
998 is = kzalloc(sizeof(*is), GFP_KERNEL);
1001 ret = seq_open(file, &nful_seq_ops);
1004 seq = file->private_data;
1012 static const struct file_operations nful_file_ops = {
1013 .owner = THIS_MODULE,
1016 .llseek = seq_lseek,
1017 .release = seq_release_private,
1020 #endif /* PROC_FS */
1022 static int __init nfnetlink_log_init(void)
1024 int i, status = -ENOMEM;
1025 #ifdef CONFIG_PROC_FS
1026 struct proc_dir_entry *proc_nful;
1029 for (i = 0; i < INSTANCE_BUCKETS; i++)
1030 INIT_HLIST_HEAD(&instance_table[i]);
1032 /* it's not really all that important to have a random value, so
1033 * we can do this from the init function, even if there hasn't
1034 * been that much entropy yet */
1035 get_random_bytes(&hash_init, sizeof(hash_init));
1037 netlink_register_notifier(&nfulnl_rtnl_notifier);
1038 status = nfnetlink_subsys_register(&nfulnl_subsys);
1040 printk(KERN_ERR "log: failed to create netlink socket\n");
1041 goto cleanup_netlink_notifier;
1044 #ifdef CONFIG_PROC_FS
1045 proc_nful = create_proc_entry("nfnetlink_log", 0440,
1046 proc_net_netfilter);
1048 goto cleanup_subsys;
1049 proc_nful->proc_fops = &nful_file_ops;
1053 #ifdef CONFIG_PROC_FS
1055 nfnetlink_subsys_unregister(&nfulnl_subsys);
1057 cleanup_netlink_notifier:
1058 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1062 static void __exit nfnetlink_log_fini(void)
1064 nf_log_unregister(&nfulnl_logger);
1065 #ifdef CONFIG_PROC_FS
1066 remove_proc_entry("nfnetlink_log", proc_net_netfilter);
1068 nfnetlink_subsys_unregister(&nfulnl_subsys);
1069 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1072 MODULE_DESCRIPTION("netfilter userspace logging");
1073 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1074 MODULE_LICENSE("GPL");
1075 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
1077 module_init(nfnetlink_log_init);
1078 module_exit(nfnetlink_log_fini);