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 timer_list timer;
62 int peer_pid; /* PID of the peer process */
64 /* configurable parameters */
65 unsigned int flushtimeout; /* timeout until queue flush */
66 unsigned int nlbufsiz; /* netlink buffer allocation size */
67 unsigned int qthreshold; /* threshold of the queue */
69 u_int32_t seq; /* instance-local sequential counter */
70 u_int16_t group_num; /* number of this queue */
75 static DEFINE_RWLOCK(instances_lock);
76 static atomic_t global_seq;
78 #define INSTANCE_BUCKETS 16
79 static struct hlist_head instance_table[INSTANCE_BUCKETS];
80 static unsigned int hash_init;
82 static inline u_int8_t instance_hashfn(u_int16_t group_num)
84 return ((group_num & 0xff) % INSTANCE_BUCKETS);
87 static struct nfulnl_instance *
88 __instance_lookup(u_int16_t group_num)
90 struct hlist_head *head;
91 struct hlist_node *pos;
92 struct nfulnl_instance *inst;
94 UDEBUG("entering (group_num=%u)\n", group_num);
96 head = &instance_table[instance_hashfn(group_num)];
97 hlist_for_each_entry(inst, pos, head, hlist) {
98 if (inst->group_num == group_num)
105 instance_get(struct nfulnl_instance *inst)
107 atomic_inc(&inst->use);
110 static struct nfulnl_instance *
111 instance_lookup_get(u_int16_t group_num)
113 struct nfulnl_instance *inst;
115 read_lock_bh(&instances_lock);
116 inst = __instance_lookup(group_num);
119 read_unlock_bh(&instances_lock);
125 instance_put(struct nfulnl_instance *inst)
127 if (inst && atomic_dec_and_test(&inst->use)) {
128 UDEBUG("kfree(inst=%p)\n", inst);
130 module_put(THIS_MODULE);
134 static void nfulnl_timer(unsigned long data);
136 static struct nfulnl_instance *
137 instance_create(u_int16_t group_num, int pid)
139 struct nfulnl_instance *inst;
141 UDEBUG("entering (group_num=%u, pid=%d)\n", group_num,
144 write_lock_bh(&instances_lock);
145 if (__instance_lookup(group_num)) {
147 UDEBUG("aborting, instance already exists\n");
151 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
155 INIT_HLIST_NODE(&inst->hlist);
156 spin_lock_init(&inst->lock);
157 /* needs to be two, since we _put() after creation */
158 atomic_set(&inst->use, 2);
160 setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst);
162 inst->peer_pid = pid;
163 inst->group_num = group_num;
165 inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
166 inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
167 inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
168 inst->copy_mode = NFULNL_COPY_PACKET;
169 inst->copy_range = 0xffff;
171 if (!try_module_get(THIS_MODULE))
174 hlist_add_head(&inst->hlist,
175 &instance_table[instance_hashfn(group_num)]);
177 UDEBUG("newly added node: %p, next=%p\n", &inst->hlist,
180 write_unlock_bh(&instances_lock);
187 write_unlock_bh(&instances_lock);
191 static void __nfulnl_flush(struct nfulnl_instance *inst);
194 __instance_destroy(struct nfulnl_instance *inst)
196 /* first pull it out of the global list */
197 UDEBUG("removing instance %p (queuenum=%u) from hash\n",
198 inst, inst->group_num);
200 hlist_del(&inst->hlist);
202 /* then flush all pending packets from skb */
204 spin_lock_bh(&inst->lock);
206 __nfulnl_flush(inst);
207 spin_unlock_bh(&inst->lock);
209 /* and finally put the refcount */
214 instance_destroy(struct nfulnl_instance *inst)
216 write_lock_bh(&instances_lock);
217 __instance_destroy(inst);
218 write_unlock_bh(&instances_lock);
222 nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
227 spin_lock_bh(&inst->lock);
230 case NFULNL_COPY_NONE:
231 case NFULNL_COPY_META:
232 inst->copy_mode = mode;
233 inst->copy_range = 0;
236 case NFULNL_COPY_PACKET:
237 inst->copy_mode = mode;
238 /* we're using struct nlattr which has 16bit nfa_len */
240 inst->copy_range = 0xffff;
242 inst->copy_range = range;
250 spin_unlock_bh(&inst->lock);
256 nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
260 spin_lock_bh(&inst->lock);
261 if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
263 else if (nlbufsiz > 131072)
266 inst->nlbufsiz = nlbufsiz;
269 spin_unlock_bh(&inst->lock);
275 nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
277 spin_lock_bh(&inst->lock);
278 inst->flushtimeout = timeout;
279 spin_unlock_bh(&inst->lock);
285 nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
287 spin_lock_bh(&inst->lock);
288 inst->qthreshold = qthresh;
289 spin_unlock_bh(&inst->lock);
295 nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
297 spin_lock_bh(&inst->lock);
299 spin_unlock_bh(&inst->lock);
304 static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size,
305 unsigned int pkt_size)
310 UDEBUG("entered (%u, %u)\n", inst_size, pkt_size);
312 /* alloc skb which should be big enough for a whole multipart
313 * message. WARNING: has to be <= 128k due to slab restrictions */
315 n = max(inst_size, pkt_size);
316 skb = alloc_skb(n, GFP_ATOMIC);
318 PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n",
322 /* try to allocate only as much as we need for current
325 skb = alloc_skb(pkt_size, GFP_ATOMIC);
327 PRINTR("nfnetlink_log: can't even alloc %u "
328 "bytes\n", pkt_size);
336 __nfulnl_send(struct nfulnl_instance *inst)
341 NLMSG_PUT(inst->skb, 0, 0,
343 sizeof(struct nfgenmsg));
345 status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT);
347 UDEBUG("netlink_unicast() failed\n");
348 /* FIXME: statistics */
359 __nfulnl_flush(struct nfulnl_instance *inst)
361 /* timer holds a reference */
362 if (del_timer(&inst->timer))
368 static void nfulnl_timer(unsigned long data)
370 struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
372 UDEBUG("timer function called, flushing buffer\n");
374 spin_lock_bh(&inst->lock);
377 spin_unlock_bh(&inst->lock);
381 /* This is an inline function, we don't really care about a long
382 * list of arguments */
384 __build_packet_message(struct nfulnl_instance *inst,
385 const struct sk_buff *skb,
386 unsigned int data_len,
388 unsigned int hooknum,
389 const struct net_device *indev,
390 const struct net_device *outdev,
391 const struct nf_loginfo *li,
392 const char *prefix, unsigned int plen)
394 struct nfulnl_msg_packet_hdr pmsg;
395 struct nlmsghdr *nlh;
396 struct nfgenmsg *nfmsg;
398 sk_buff_data_t old_tail = inst->skb->tail;
402 nlh = NLMSG_PUT(inst->skb, 0, 0,
403 NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
404 sizeof(struct nfgenmsg));
405 nfmsg = NLMSG_DATA(nlh);
406 nfmsg->nfgen_family = pf;
407 nfmsg->version = NFNETLINK_V0;
408 nfmsg->res_id = htons(inst->group_num);
410 pmsg.hw_protocol = skb->protocol;
413 NLA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg);
416 NLA_PUT(inst->skb, NFULA_PREFIX, plen, prefix);
419 tmp_uint = htonl(indev->ifindex);
420 #ifndef CONFIG_BRIDGE_NETFILTER
421 NLA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint),
424 if (pf == PF_BRIDGE) {
425 /* Case 1: outdev is physical input device, we need to
426 * look for bridge group (when called from
427 * netfilter_bridge) */
428 NLA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
429 sizeof(tmp_uint), &tmp_uint);
430 /* this is the bridge group "brX" */
431 tmp_uint = htonl(indev->br_port->br->dev->ifindex);
432 NLA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
433 sizeof(tmp_uint), &tmp_uint);
435 /* Case 2: indev is bridge group, we need to look for
436 * physical device (when called from ipv4) */
437 NLA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
438 sizeof(tmp_uint), &tmp_uint);
439 if (skb->nf_bridge && skb->nf_bridge->physindev) {
441 htonl(skb->nf_bridge->physindev->ifindex);
442 NLA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
443 sizeof(tmp_uint), &tmp_uint);
450 tmp_uint = htonl(outdev->ifindex);
451 #ifndef CONFIG_BRIDGE_NETFILTER
452 NLA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint),
455 if (pf == PF_BRIDGE) {
456 /* Case 1: outdev is physical output device, we need to
457 * look for bridge group (when called from
458 * netfilter_bridge) */
459 NLA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
460 sizeof(tmp_uint), &tmp_uint);
461 /* this is the bridge group "brX" */
462 tmp_uint = htonl(outdev->br_port->br->dev->ifindex);
463 NLA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
464 sizeof(tmp_uint), &tmp_uint);
466 /* Case 2: indev is a bridge group, we need to look
467 * for physical device (when called from ipv4) */
468 NLA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
469 sizeof(tmp_uint), &tmp_uint);
470 if (skb->nf_bridge && skb->nf_bridge->physoutdev) {
472 htonl(skb->nf_bridge->physoutdev->ifindex);
473 NLA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
474 sizeof(tmp_uint), &tmp_uint);
481 tmp_uint = htonl(skb->mark);
482 NLA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint);
485 if (indev && skb->dev) {
486 struct nfulnl_msg_packet_hw phw;
487 int len = dev_parse_header(skb, phw.hw_addr);
489 phw.hw_addrlen = htons(len);
490 NLA_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 NLA_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 NLA_PUT may goto */
509 read_unlock_bh(&skb->sk->sk_callback_lock);
510 NLA_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 NLA_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 NLA_PUT(inst->skb, NFULA_SEQ_GLOBAL, sizeof(tmp_uint), &tmp_uint);
528 int size = nla_attr_size(data_len);
530 if (skb_tailroom(inst->skb) < nla_total_size(data_len)) {
531 printk(KERN_WARNING "nfnetlink_log: no tailroom!\n");
535 nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len));
536 nla->nla_type = NFULA_PAYLOAD;
539 if (skb_copy_bits(skb, 0, nla_data(nla), data_len))
543 nlh->nlmsg_len = inst->skb->tail - old_tail;
547 UDEBUG("nlmsg_failure\n");
549 PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
553 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
555 static struct nf_loginfo default_loginfo = {
556 .type = NF_LOG_TYPE_ULOG,
566 /* log handler for internal netfilter logging api */
568 nfulnl_log_packet(unsigned int pf,
569 unsigned int hooknum,
570 const struct sk_buff *skb,
571 const struct net_device *in,
572 const struct net_device *out,
573 const struct nf_loginfo *li_user,
576 unsigned int size, data_len;
577 struct nfulnl_instance *inst;
578 const struct nf_loginfo *li;
579 unsigned int qthreshold;
582 if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
585 li = &default_loginfo;
587 inst = instance_lookup_get(li->u.ulog.group);
593 plen = strlen(prefix) + 1;
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_ALIGN(sizeof(struct nfgenmsg))
599 + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr))
600 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
601 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
602 #ifdef CONFIG_BRIDGE_NETFILTER
603 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
604 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
606 + nla_total_size(sizeof(u_int32_t)) /* mark */
607 + nla_total_size(sizeof(u_int32_t)) /* uid */
608 + nla_total_size(plen) /* prefix */
609 + nla_total_size(sizeof(struct nfulnl_msg_packet_hw))
610 + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp));
612 UDEBUG("initial size=%u\n", size);
614 spin_lock_bh(&inst->lock);
616 if (inst->flags & NFULNL_CFG_F_SEQ)
617 size += nla_total_size(sizeof(u_int32_t));
618 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
619 size += nla_total_size(sizeof(u_int32_t));
621 qthreshold = inst->qthreshold;
622 /* per-rule qthreshold overrides per-instance */
623 if (qthreshold > li->u.ulog.qthreshold)
624 qthreshold = li->u.ulog.qthreshold;
626 switch (inst->copy_mode) {
627 case NFULNL_COPY_META:
628 case NFULNL_COPY_NONE:
632 case NFULNL_COPY_PACKET:
633 if (inst->copy_range == 0
634 || inst->copy_range > skb->len)
637 data_len = inst->copy_range;
639 size += nla_total_size(data_len);
640 UDEBUG("copy_packet, therefore size now %u\n", size);
644 goto unlock_and_release;
648 size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) {
649 /* either the queue len is too high or we don't have
650 * enough room in the skb left. flush to userspace. */
651 UDEBUG("flushing old skb\n");
653 __nfulnl_flush(inst);
657 inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size);
662 UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold);
665 __build_packet_message(inst, skb, data_len, pf,
666 hooknum, in, out, li, prefix, plen);
668 if (inst->qlen >= qthreshold)
669 __nfulnl_flush(inst);
670 /* timer_pending always called within inst->lock, so there
671 * is no chance of a race here */
672 else if (!timer_pending(&inst->timer)) {
674 inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
675 add_timer(&inst->timer);
679 spin_unlock_bh(&inst->lock);
684 UDEBUG("error allocating skb\n");
685 /* FIXME: statistics */
686 goto unlock_and_release;
690 nfulnl_rcv_nl_event(struct notifier_block *this,
691 unsigned long event, void *ptr)
693 struct netlink_notify *n = ptr;
695 if (event == NETLINK_URELEASE &&
696 n->protocol == NETLINK_NETFILTER && n->pid) {
699 /* destroy all instances for this pid */
700 write_lock_bh(&instances_lock);
701 for (i = 0; i < INSTANCE_BUCKETS; i++) {
702 struct hlist_node *tmp, *t2;
703 struct nfulnl_instance *inst;
704 struct hlist_head *head = &instance_table[i];
706 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
707 UDEBUG("node = %p\n", inst);
708 if ((n->net == &init_net) &&
709 (n->pid == inst->peer_pid))
710 __instance_destroy(inst);
713 write_unlock_bh(&instances_lock);
718 static struct notifier_block nfulnl_rtnl_notifier = {
719 .notifier_call = nfulnl_rcv_nl_event,
723 nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
724 struct nlmsghdr *nlh, struct nlattr *nfqa[])
729 static struct nf_logger nfulnl_logger = {
730 .name = "nfnetlink_log",
731 .logfn = &nfulnl_log_packet,
735 static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = {
736 [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) },
737 [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) },
738 [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 },
739 [NFULA_CFG_QTHRESH] = { .type = NLA_U32 },
740 [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 },
741 [NFULA_CFG_FLAGS] = { .type = NLA_U16 },
745 nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
746 struct nlmsghdr *nlh, struct nlattr *nfula[])
748 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
749 u_int16_t group_num = ntohs(nfmsg->res_id);
750 struct nfulnl_instance *inst;
753 UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type));
755 inst = instance_lookup_get(group_num);
756 if (nfula[NFULA_CFG_CMD]) {
757 u_int8_t pf = nfmsg->nfgen_family;
758 struct nfulnl_msg_config_cmd *cmd;
759 cmd = nla_data(nfula[NFULA_CFG_CMD]);
760 UDEBUG("found CFG_CMD for\n");
762 switch (cmd->command) {
763 case NFULNL_CFG_CMD_BIND:
769 inst = instance_create(group_num,
770 NETLINK_CB(skb).pid);
776 case NFULNL_CFG_CMD_UNBIND:
782 if (inst->peer_pid != NETLINK_CB(skb).pid) {
787 instance_destroy(inst);
789 case NFULNL_CFG_CMD_PF_BIND:
790 UDEBUG("registering log handler for pf=%u\n", pf);
791 ret = nf_log_register(pf, &nfulnl_logger);
793 case NFULNL_CFG_CMD_PF_UNBIND:
794 UDEBUG("unregistering log handler for pf=%u\n", pf);
795 /* This is a bug and a feature. We cannot unregister
796 * other handlers, like nfnetlink_inst can */
797 nf_log_unregister_pf(pf);
808 UDEBUG("no config command, and no instance for "
809 "group=%u pid=%u =>ENOENT\n",
810 group_num, NETLINK_CB(skb).pid);
815 if (inst->peer_pid != NETLINK_CB(skb).pid) {
816 UDEBUG("no config command, and wrong pid\n");
822 if (nfula[NFULA_CFG_MODE]) {
823 struct nfulnl_msg_config_mode *params;
824 params = nla_data(nfula[NFULA_CFG_MODE]);
826 nfulnl_set_mode(inst, params->copy_mode,
827 ntohl(params->copy_range));
830 if (nfula[NFULA_CFG_TIMEOUT]) {
832 *(__be32 *)nla_data(nfula[NFULA_CFG_TIMEOUT]);
834 nfulnl_set_timeout(inst, ntohl(timeout));
837 if (nfula[NFULA_CFG_NLBUFSIZ]) {
839 *(__be32 *)nla_data(nfula[NFULA_CFG_NLBUFSIZ]);
841 nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
844 if (nfula[NFULA_CFG_QTHRESH]) {
846 *(__be32 *)nla_data(nfula[NFULA_CFG_QTHRESH]);
848 nfulnl_set_qthresh(inst, ntohl(qthresh));
851 if (nfula[NFULA_CFG_FLAGS]) {
853 *(__be16 *)nla_data(nfula[NFULA_CFG_FLAGS]);
854 nfulnl_set_flags(inst, ntohs(flags));
863 static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
864 [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
865 .attr_count = NFULA_MAX, },
866 [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
867 .attr_count = NFULA_CFG_MAX,
868 .policy = nfula_cfg_policy },
871 static const struct nfnetlink_subsystem nfulnl_subsys = {
873 .subsys_id = NFNL_SUBSYS_ULOG,
874 .cb_count = NFULNL_MSG_MAX,
878 #ifdef CONFIG_PROC_FS
883 static struct hlist_node *get_first(struct iter_state *st)
888 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
889 if (!hlist_empty(&instance_table[st->bucket]))
890 return instance_table[st->bucket].first;
895 static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h)
899 if (++st->bucket >= INSTANCE_BUCKETS)
902 h = instance_table[st->bucket].first;
907 static struct hlist_node *get_idx(struct iter_state *st, loff_t pos)
909 struct hlist_node *head;
910 head = get_first(st);
913 while (pos && (head = get_next(st, head)))
915 return pos ? NULL : head;
918 static void *seq_start(struct seq_file *seq, loff_t *pos)
920 read_lock_bh(&instances_lock);
921 return get_idx(seq->private, *pos);
924 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
927 return get_next(s->private, v);
930 static void seq_stop(struct seq_file *s, void *v)
932 read_unlock_bh(&instances_lock);
935 static int seq_show(struct seq_file *s, void *v)
937 const struct nfulnl_instance *inst = v;
939 return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
941 inst->peer_pid, inst->qlen,
942 inst->copy_mode, inst->copy_range,
943 inst->flushtimeout, atomic_read(&inst->use));
946 static const struct seq_operations nful_seq_ops = {
953 static int nful_open(struct inode *inode, struct file *file)
955 struct seq_file *seq;
956 struct iter_state *is;
959 is = kzalloc(sizeof(*is), GFP_KERNEL);
962 ret = seq_open(file, &nful_seq_ops);
965 seq = file->private_data;
973 static const struct file_operations nful_file_ops = {
974 .owner = THIS_MODULE,
978 .release = seq_release_private,
983 static int __init nfnetlink_log_init(void)
985 int i, status = -ENOMEM;
986 #ifdef CONFIG_PROC_FS
987 struct proc_dir_entry *proc_nful;
990 for (i = 0; i < INSTANCE_BUCKETS; i++)
991 INIT_HLIST_HEAD(&instance_table[i]);
993 /* it's not really all that important to have a random value, so
994 * we can do this from the init function, even if there hasn't
995 * been that much entropy yet */
996 get_random_bytes(&hash_init, sizeof(hash_init));
998 netlink_register_notifier(&nfulnl_rtnl_notifier);
999 status = nfnetlink_subsys_register(&nfulnl_subsys);
1001 printk(KERN_ERR "log: failed to create netlink socket\n");
1002 goto cleanup_netlink_notifier;
1005 #ifdef CONFIG_PROC_FS
1006 proc_nful = create_proc_entry("nfnetlink_log", 0440,
1007 proc_net_netfilter);
1009 goto cleanup_subsys;
1010 proc_nful->proc_fops = &nful_file_ops;
1014 #ifdef CONFIG_PROC_FS
1016 nfnetlink_subsys_unregister(&nfulnl_subsys);
1018 cleanup_netlink_notifier:
1019 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1023 static void __exit nfnetlink_log_fini(void)
1025 nf_log_unregister(&nfulnl_logger);
1026 #ifdef CONFIG_PROC_FS
1027 remove_proc_entry("nfnetlink_log", proc_net_netfilter);
1029 nfnetlink_subsys_unregister(&nfulnl_subsys);
1030 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1033 MODULE_DESCRIPTION("netfilter userspace logging");
1034 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1035 MODULE_LICENSE("GPL");
1036 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
1038 module_init(nfnetlink_log_init);
1039 module_exit(nfnetlink_log_fini);