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 int __nfulnl_send(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 /* timer "holds" one reference (we have one more) */
207 if (del_timer(&inst->timer))
212 kfree_skb(inst->skb);
216 spin_unlock_bh(&inst->lock);
218 /* and finally put the refcount */
223 instance_destroy(struct nfulnl_instance *inst)
225 write_lock_bh(&instances_lock);
226 __instance_destroy(inst);
227 write_unlock_bh(&instances_lock);
231 nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
236 spin_lock_bh(&inst->lock);
239 case NFULNL_COPY_NONE:
240 case NFULNL_COPY_META:
241 inst->copy_mode = mode;
242 inst->copy_range = 0;
245 case NFULNL_COPY_PACKET:
246 inst->copy_mode = mode;
247 /* we're using struct nfattr which has 16bit nfa_len */
249 inst->copy_range = 0xffff;
251 inst->copy_range = range;
259 spin_unlock_bh(&inst->lock);
265 nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
269 spin_lock_bh(&inst->lock);
270 if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
272 else if (nlbufsiz > 131072)
275 inst->nlbufsiz = nlbufsiz;
278 spin_unlock_bh(&inst->lock);
284 nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
286 spin_lock_bh(&inst->lock);
287 inst->flushtimeout = timeout;
288 spin_unlock_bh(&inst->lock);
294 nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
296 spin_lock_bh(&inst->lock);
297 inst->qthreshold = qthresh;
298 spin_unlock_bh(&inst->lock);
304 nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
306 spin_lock_bh(&inst->lock);
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)
350 NLMSG_PUT(inst->skb, 0, 0,
352 sizeof(struct nfgenmsg));
354 status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT);
356 UDEBUG("netlink_unicast() failed\n");
357 /* FIXME: statistics */
367 static void nfulnl_timer(unsigned long data)
369 struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
371 UDEBUG("timer function called, flushing buffer\n");
373 spin_lock_bh(&inst->lock);
376 spin_unlock_bh(&inst->lock);
380 /* This is an inline function, we don't really care about a long
381 * list of arguments */
383 __build_packet_message(struct nfulnl_instance *inst,
384 const struct sk_buff *skb,
385 unsigned int data_len,
387 unsigned int hooknum,
388 const struct net_device *indev,
389 const struct net_device *outdev,
390 const struct nf_loginfo *li,
391 const char *prefix, unsigned int plen)
393 struct nfulnl_msg_packet_hdr pmsg;
394 struct nlmsghdr *nlh;
395 struct nfgenmsg *nfmsg;
397 sk_buff_data_t old_tail = inst->skb->tail;
401 nlh = NLMSG_PUT(inst->skb, 0, 0,
402 NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
403 sizeof(struct nfgenmsg));
404 nfmsg = NLMSG_DATA(nlh);
405 nfmsg->nfgen_family = pf;
406 nfmsg->version = NFNETLINK_V0;
407 nfmsg->res_id = htons(inst->group_num);
409 pmsg.hw_protocol = skb->protocol;
412 NFA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg);
415 NFA_PUT(inst->skb, NFULA_PREFIX, plen, prefix);
418 tmp_uint = htonl(indev->ifindex);
419 #ifndef CONFIG_BRIDGE_NETFILTER
420 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint),
423 if (pf == PF_BRIDGE) {
424 /* Case 1: outdev is physical input device, we need to
425 * look for bridge group (when called from
426 * netfilter_bridge) */
427 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
428 sizeof(tmp_uint), &tmp_uint);
429 /* this is the bridge group "brX" */
430 tmp_uint = htonl(indev->br_port->br->dev->ifindex);
431 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
432 sizeof(tmp_uint), &tmp_uint);
434 /* Case 2: indev is bridge group, we need to look for
435 * physical device (when called from ipv4) */
436 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
437 sizeof(tmp_uint), &tmp_uint);
438 if (skb->nf_bridge && skb->nf_bridge->physindev) {
440 htonl(skb->nf_bridge->physindev->ifindex);
441 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
442 sizeof(tmp_uint), &tmp_uint);
449 tmp_uint = htonl(outdev->ifindex);
450 #ifndef CONFIG_BRIDGE_NETFILTER
451 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint),
454 if (pf == PF_BRIDGE) {
455 /* Case 1: outdev is physical output device, we need to
456 * look for bridge group (when called from
457 * netfilter_bridge) */
458 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
459 sizeof(tmp_uint), &tmp_uint);
460 /* this is the bridge group "brX" */
461 tmp_uint = htonl(outdev->br_port->br->dev->ifindex);
462 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
463 sizeof(tmp_uint), &tmp_uint);
465 /* Case 2: indev is a bridge group, we need to look
466 * for physical device (when called from ipv4) */
467 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
468 sizeof(tmp_uint), &tmp_uint);
469 if (skb->nf_bridge && skb->nf_bridge->physoutdev) {
471 htonl(skb->nf_bridge->physoutdev->ifindex);
472 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
473 sizeof(tmp_uint), &tmp_uint);
480 tmp_uint = htonl(skb->mark);
481 NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint);
484 if (indev && skb->dev) {
485 struct nfulnl_msg_packet_hw phw;
486 int len = dev_parse_header(skb, phw.hw_addr);
488 phw.hw_addrlen = htons(len);
489 NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw);
493 if (skb->tstamp.tv64) {
494 struct nfulnl_msg_packet_timestamp ts;
495 struct timeval tv = ktime_to_timeval(skb->tstamp);
496 ts.sec = cpu_to_be64(tv.tv_sec);
497 ts.usec = cpu_to_be64(tv.tv_usec);
499 NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts);
504 read_lock_bh(&skb->sk->sk_callback_lock);
505 if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
506 __be32 uid = htonl(skb->sk->sk_socket->file->f_uid);
507 /* need to unlock here since NFA_PUT may goto */
508 read_unlock_bh(&skb->sk->sk_callback_lock);
509 NFA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid);
511 read_unlock_bh(&skb->sk->sk_callback_lock);
514 /* local sequence number */
515 if (inst->flags & NFULNL_CFG_F_SEQ) {
516 tmp_uint = htonl(inst->seq++);
517 NFA_PUT(inst->skb, NFULA_SEQ, sizeof(tmp_uint), &tmp_uint);
519 /* global sequence number */
520 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) {
521 tmp_uint = htonl(atomic_inc_return(&global_seq));
522 NFA_PUT(inst->skb, NFULA_SEQ_GLOBAL, sizeof(tmp_uint), &tmp_uint);
527 int size = NFA_LENGTH(data_len);
529 if (skb_tailroom(inst->skb) < (int)NFA_SPACE(data_len)) {
530 printk(KERN_WARNING "nfnetlink_log: no tailroom!\n");
534 nfa = (struct nfattr *)skb_put(inst->skb, NFA_ALIGN(size));
535 nfa->nfa_type = NFULA_PAYLOAD;
538 if (skb_copy_bits(skb, 0, NFA_DATA(nfa), data_len))
542 nlh->nlmsg_len = inst->skb->tail - old_tail;
546 UDEBUG("nlmsg_failure\n");
548 PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
552 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
554 static struct nf_loginfo default_loginfo = {
555 .type = NF_LOG_TYPE_ULOG,
565 /* log handler for internal netfilter logging api */
567 nfulnl_log_packet(unsigned int pf,
568 unsigned int hooknum,
569 const struct sk_buff *skb,
570 const struct net_device *in,
571 const struct net_device *out,
572 const struct nf_loginfo *li_user,
575 unsigned int size, data_len;
576 struct nfulnl_instance *inst;
577 const struct nf_loginfo *li;
578 unsigned int qthreshold;
581 if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
584 li = &default_loginfo;
586 inst = instance_lookup_get(li->u.ulog.group);
592 plen = strlen(prefix) + 1;
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(plen) /* 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 if (inst->flags & NFULNL_CFG_F_SEQ)
617 size += NFA_SPACE(sizeof(u_int32_t));
618 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
619 size += NFA_SPACE(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 += NFA_SPACE(data_len);
640 UDEBUG("copy_packet, therefore size now %u\n", size);
644 goto unlock_and_release;
647 if (inst->qlen >= qthreshold ||
649 skb_tailroom(inst->skb) - sizeof(struct nfgenmsg))) {
650 /* either the queue len is too high or we don't have
651 * enough room in the skb left. flush to userspace. */
652 UDEBUG("flushing old skb\n");
654 /* timer "holds" one reference (we have another one) */
655 if (del_timer(&inst->timer))
661 inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size);
666 UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold);
669 __build_packet_message(inst, skb, data_len, pf,
670 hooknum, in, out, li, prefix, plen);
672 /* timer_pending always called within inst->lock, so there
673 * is no chance of a race here */
674 if (!timer_pending(&inst->timer)) {
676 inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
677 add_timer(&inst->timer);
681 spin_unlock_bh(&inst->lock);
686 UDEBUG("error allocating skb\n");
687 /* FIXME: statistics */
688 goto unlock_and_release;
692 nfulnl_rcv_nl_event(struct notifier_block *this,
693 unsigned long event, void *ptr)
695 struct netlink_notify *n = ptr;
697 if (event == NETLINK_URELEASE &&
698 n->protocol == NETLINK_NETFILTER && n->pid) {
701 /* destroy all instances for this pid */
702 write_lock_bh(&instances_lock);
703 for (i = 0; i < INSTANCE_BUCKETS; i++) {
704 struct hlist_node *tmp, *t2;
705 struct nfulnl_instance *inst;
706 struct hlist_head *head = &instance_table[i];
708 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
709 UDEBUG("node = %p\n", inst);
710 if ((n->net == &init_net) &&
711 (n->pid == inst->peer_pid))
712 __instance_destroy(inst);
715 write_unlock_bh(&instances_lock);
720 static struct notifier_block nfulnl_rtnl_notifier = {
721 .notifier_call = nfulnl_rcv_nl_event,
725 nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
726 struct nlmsghdr *nlh, struct nfattr *nfqa[])
731 static struct nf_logger nfulnl_logger = {
732 .name = "nfnetlink_log",
733 .logfn = &nfulnl_log_packet,
737 static const int nfula_min[NFULA_MAX] = {
738 [NFULA_PACKET_HDR-1] = sizeof(struct nfulnl_msg_packet_hdr),
739 [NFULA_MARK-1] = sizeof(u_int32_t),
740 [NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp),
741 [NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t),
742 [NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t),
743 [NFULA_IFINDEX_PHYSINDEV-1] = sizeof(u_int32_t),
744 [NFULA_IFINDEX_PHYSOUTDEV-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),
749 [NFULA_SEQ-1] = sizeof(u_int32_t),
750 [NFULA_SEQ_GLOBAL-1] = sizeof(u_int32_t),
753 static const int nfula_cfg_min[NFULA_CFG_MAX] = {
754 [NFULA_CFG_CMD-1] = sizeof(struct nfulnl_msg_config_cmd),
755 [NFULA_CFG_MODE-1] = sizeof(struct nfulnl_msg_config_mode),
756 [NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t),
757 [NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t),
758 [NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t),
759 [NFULA_CFG_FLAGS-1] = sizeof(u_int16_t),
763 nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
764 struct nlmsghdr *nlh, struct nfattr *nfula[])
766 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
767 u_int16_t group_num = ntohs(nfmsg->res_id);
768 struct nfulnl_instance *inst;
771 UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type));
773 if (nfattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) {
774 UDEBUG("bad attribute size\n");
778 inst = instance_lookup_get(group_num);
779 if (nfula[NFULA_CFG_CMD-1]) {
780 u_int8_t pf = nfmsg->nfgen_family;
781 struct nfulnl_msg_config_cmd *cmd;
782 cmd = NFA_DATA(nfula[NFULA_CFG_CMD-1]);
783 UDEBUG("found CFG_CMD for\n");
785 switch (cmd->command) {
786 case NFULNL_CFG_CMD_BIND:
792 inst = instance_create(group_num,
793 NETLINK_CB(skb).pid);
799 case NFULNL_CFG_CMD_UNBIND:
805 if (inst->peer_pid != NETLINK_CB(skb).pid) {
810 instance_destroy(inst);
812 case NFULNL_CFG_CMD_PF_BIND:
813 UDEBUG("registering log handler for pf=%u\n", pf);
814 ret = nf_log_register(pf, &nfulnl_logger);
816 case NFULNL_CFG_CMD_PF_UNBIND:
817 UDEBUG("unregistering log handler for pf=%u\n", pf);
818 /* This is a bug and a feature. We cannot unregister
819 * other handlers, like nfnetlink_inst can */
820 nf_log_unregister_pf(pf);
831 UDEBUG("no config command, and no instance for "
832 "group=%u pid=%u =>ENOENT\n",
833 group_num, NETLINK_CB(skb).pid);
838 if (inst->peer_pid != NETLINK_CB(skb).pid) {
839 UDEBUG("no config command, and wrong pid\n");
845 if (nfula[NFULA_CFG_MODE-1]) {
846 struct nfulnl_msg_config_mode *params;
847 params = NFA_DATA(nfula[NFULA_CFG_MODE-1]);
849 nfulnl_set_mode(inst, params->copy_mode,
850 ntohl(params->copy_range));
853 if (nfula[NFULA_CFG_TIMEOUT-1]) {
855 *(__be32 *)NFA_DATA(nfula[NFULA_CFG_TIMEOUT-1]);
857 nfulnl_set_timeout(inst, ntohl(timeout));
860 if (nfula[NFULA_CFG_NLBUFSIZ-1]) {
862 *(__be32 *)NFA_DATA(nfula[NFULA_CFG_NLBUFSIZ-1]);
864 nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
867 if (nfula[NFULA_CFG_QTHRESH-1]) {
869 *(__be32 *)NFA_DATA(nfula[NFULA_CFG_QTHRESH-1]);
871 nfulnl_set_qthresh(inst, ntohl(qthresh));
874 if (nfula[NFULA_CFG_FLAGS-1]) {
876 *(__be16 *)NFA_DATA(nfula[NFULA_CFG_FLAGS-1]);
877 nfulnl_set_flags(inst, ntohs(flags));
886 static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
887 [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
888 .attr_count = NFULA_MAX, },
889 [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
890 .attr_count = NFULA_CFG_MAX, },
893 static const struct nfnetlink_subsystem nfulnl_subsys = {
895 .subsys_id = NFNL_SUBSYS_ULOG,
896 .cb_count = NFULNL_MSG_MAX,
900 #ifdef CONFIG_PROC_FS
905 static struct hlist_node *get_first(struct iter_state *st)
910 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
911 if (!hlist_empty(&instance_table[st->bucket]))
912 return instance_table[st->bucket].first;
917 static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h)
921 if (++st->bucket >= INSTANCE_BUCKETS)
924 h = instance_table[st->bucket].first;
929 static struct hlist_node *get_idx(struct iter_state *st, loff_t pos)
931 struct hlist_node *head;
932 head = get_first(st);
935 while (pos && (head = get_next(st, head)))
937 return pos ? NULL : head;
940 static void *seq_start(struct seq_file *seq, loff_t *pos)
942 read_lock_bh(&instances_lock);
943 return get_idx(seq->private, *pos);
946 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
949 return get_next(s->private, v);
952 static void seq_stop(struct seq_file *s, void *v)
954 read_unlock_bh(&instances_lock);
957 static int seq_show(struct seq_file *s, void *v)
959 const struct nfulnl_instance *inst = v;
961 return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
963 inst->peer_pid, inst->qlen,
964 inst->copy_mode, inst->copy_range,
965 inst->flushtimeout, atomic_read(&inst->use));
968 static const struct seq_operations nful_seq_ops = {
975 static int nful_open(struct inode *inode, struct file *file)
977 struct seq_file *seq;
978 struct iter_state *is;
981 is = kzalloc(sizeof(*is), GFP_KERNEL);
984 ret = seq_open(file, &nful_seq_ops);
987 seq = file->private_data;
995 static const struct file_operations nful_file_ops = {
996 .owner = THIS_MODULE,
1000 .release = seq_release_private,
1003 #endif /* PROC_FS */
1005 static int __init nfnetlink_log_init(void)
1007 int i, status = -ENOMEM;
1008 #ifdef CONFIG_PROC_FS
1009 struct proc_dir_entry *proc_nful;
1012 for (i = 0; i < INSTANCE_BUCKETS; i++)
1013 INIT_HLIST_HEAD(&instance_table[i]);
1015 /* it's not really all that important to have a random value, so
1016 * we can do this from the init function, even if there hasn't
1017 * been that much entropy yet */
1018 get_random_bytes(&hash_init, sizeof(hash_init));
1020 netlink_register_notifier(&nfulnl_rtnl_notifier);
1021 status = nfnetlink_subsys_register(&nfulnl_subsys);
1023 printk(KERN_ERR "log: failed to create netlink socket\n");
1024 goto cleanup_netlink_notifier;
1027 #ifdef CONFIG_PROC_FS
1028 proc_nful = create_proc_entry("nfnetlink_log", 0440,
1029 proc_net_netfilter);
1031 goto cleanup_subsys;
1032 proc_nful->proc_fops = &nful_file_ops;
1036 #ifdef CONFIG_PROC_FS
1038 nfnetlink_subsys_unregister(&nfulnl_subsys);
1040 cleanup_netlink_notifier:
1041 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1045 static void __exit nfnetlink_log_fini(void)
1047 nf_log_unregister(&nfulnl_logger);
1048 #ifdef CONFIG_PROC_FS
1049 remove_proc_entry("nfnetlink_log", proc_net_netfilter);
1051 nfnetlink_subsys_unregister(&nfulnl_subsys);
1052 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
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);
1060 module_init(nfnetlink_log_init);
1061 module_exit(nfnetlink_log_fini);