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 * 2006-01-26 Harald Welte <laforge@netfilter.org>
15 * - Add optional local and global sequence number to detect lost
16 * events from userspace
19 #include <linux/module.h>
20 #include <linux/skbuff.h>
21 #include <linux/init.h>
23 #include <linux/ipv6.h>
24 #include <linux/netdevice.h>
25 #include <linux/netfilter.h>
26 #include <linux/netlink.h>
27 #include <linux/netfilter/nfnetlink.h>
28 #include <linux/netfilter/nfnetlink_log.h>
29 #include <linux/spinlock.h>
30 #include <linux/sysctl.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/list.h>
34 #include <linux/jhash.h>
35 #include <linux/random.h>
38 #include <asm/atomic.h>
40 #ifdef CONFIG_BRIDGE_NETFILTER
41 #include "../bridge/br_private.h"
44 #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
45 #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
46 #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
48 #define PRINTR(x, args...) do { if (net_ratelimit()) \
49 printk(x, ## args); } while (0);
52 #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \
53 __FILE__, __LINE__, __FUNCTION__, \
56 #define UDEBUG(x, ...)
59 struct nfulnl_instance {
60 struct hlist_node hlist; /* global list of instances */
62 atomic_t use; /* use count */
64 unsigned int qlen; /* number of nlmsgs in skb */
65 struct sk_buff *skb; /* pre-allocatd skb */
66 struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */
67 struct timer_list timer;
68 int peer_pid; /* PID of the peer process */
70 /* configurable parameters */
71 unsigned int flushtimeout; /* timeout until queue flush */
72 unsigned int nlbufsiz; /* netlink buffer allocation size */
73 unsigned int qthreshold; /* threshold of the queue */
75 u_int32_t seq; /* instance-local sequential counter */
76 u_int16_t group_num; /* number of this queue */
81 static DEFINE_RWLOCK(instances_lock);
82 static atomic_t global_seq;
84 #define INSTANCE_BUCKETS 16
85 static struct hlist_head instance_table[INSTANCE_BUCKETS];
86 static unsigned int hash_init;
88 static inline u_int8_t instance_hashfn(u_int16_t group_num)
90 return ((group_num & 0xff) % INSTANCE_BUCKETS);
93 static struct nfulnl_instance *
94 __instance_lookup(u_int16_t group_num)
96 struct hlist_head *head;
97 struct hlist_node *pos;
98 struct nfulnl_instance *inst;
100 UDEBUG("entering (group_num=%u)\n", group_num);
102 head = &instance_table[instance_hashfn(group_num)];
103 hlist_for_each_entry(inst, pos, head, hlist) {
104 if (inst->group_num == group_num)
111 instance_get(struct nfulnl_instance *inst)
113 atomic_inc(&inst->use);
116 static struct nfulnl_instance *
117 instance_lookup_get(u_int16_t group_num)
119 struct nfulnl_instance *inst;
121 read_lock_bh(&instances_lock);
122 inst = __instance_lookup(group_num);
125 read_unlock_bh(&instances_lock);
131 instance_put(struct nfulnl_instance *inst)
133 if (inst && atomic_dec_and_test(&inst->use)) {
134 UDEBUG("kfree(inst=%p)\n", inst);
139 static void nfulnl_timer(unsigned long data);
141 static struct nfulnl_instance *
142 instance_create(u_int16_t group_num, int pid)
144 struct nfulnl_instance *inst;
146 UDEBUG("entering (group_num=%u, pid=%d)\n", group_num,
149 write_lock_bh(&instances_lock);
150 if (__instance_lookup(group_num)) {
152 UDEBUG("aborting, instance already exists\n");
156 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
160 INIT_HLIST_NODE(&inst->hlist);
161 spin_lock_init(&inst->lock);
162 /* needs to be two, since we _put() after creation */
163 atomic_set(&inst->use, 2);
165 init_timer(&inst->timer);
166 inst->timer.function = nfulnl_timer;
167 inst->timer.data = (unsigned long)inst;
168 /* don't start timer yet. (re)start it with every packet */
170 inst->peer_pid = pid;
171 inst->group_num = group_num;
173 inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
174 inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
175 inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
176 inst->copy_mode = NFULNL_COPY_PACKET;
177 inst->copy_range = 0xffff;
179 if (!try_module_get(THIS_MODULE))
182 hlist_add_head(&inst->hlist,
183 &instance_table[instance_hashfn(group_num)]);
185 UDEBUG("newly added node: %p, next=%p\n", &inst->hlist,
188 write_unlock_bh(&instances_lock);
195 write_unlock_bh(&instances_lock);
199 static int __nfulnl_send(struct nfulnl_instance *inst);
202 _instance_destroy2(struct nfulnl_instance *inst, int lock)
204 /* first pull it out of the global list */
206 write_lock_bh(&instances_lock);
208 UDEBUG("removing instance %p (queuenum=%u) from hash\n",
209 inst, inst->group_num);
211 hlist_del(&inst->hlist);
214 write_unlock_bh(&instances_lock);
216 /* then flush all pending packets from skb */
218 spin_lock_bh(&inst->lock);
223 kfree_skb(inst->skb);
227 spin_unlock_bh(&inst->lock);
229 /* and finally put the refcount */
232 module_put(THIS_MODULE);
236 __instance_destroy(struct nfulnl_instance *inst)
238 _instance_destroy2(inst, 0);
242 instance_destroy(struct nfulnl_instance *inst)
244 _instance_destroy2(inst, 1);
248 nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
253 spin_lock_bh(&inst->lock);
256 case NFULNL_COPY_NONE:
257 case NFULNL_COPY_META:
258 inst->copy_mode = mode;
259 inst->copy_range = 0;
262 case NFULNL_COPY_PACKET:
263 inst->copy_mode = mode;
264 /* we're using struct nfattr which has 16bit nfa_len */
266 inst->copy_range = 0xffff;
268 inst->copy_range = range;
276 spin_unlock_bh(&inst->lock);
282 nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
286 spin_lock_bh(&inst->lock);
287 if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
289 else if (nlbufsiz > 131072)
292 inst->nlbufsiz = nlbufsiz;
295 spin_unlock_bh(&inst->lock);
301 nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
303 spin_lock_bh(&inst->lock);
304 inst->flushtimeout = timeout;
305 spin_unlock_bh(&inst->lock);
311 nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
313 spin_lock_bh(&inst->lock);
314 inst->qthreshold = qthresh;
315 spin_unlock_bh(&inst->lock);
321 nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
323 spin_lock_bh(&inst->lock);
325 spin_unlock_bh(&inst->lock);
330 static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size,
331 unsigned int pkt_size)
336 UDEBUG("entered (%u, %u)\n", inst_size, pkt_size);
338 /* alloc skb which should be big enough for a whole multipart
339 * message. WARNING: has to be <= 128k due to slab restrictions */
341 n = max(inst_size, pkt_size);
342 skb = alloc_skb(n, GFP_ATOMIC);
344 PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n",
348 /* try to allocate only as much as we need for current
351 skb = alloc_skb(pkt_size, GFP_ATOMIC);
353 PRINTR("nfnetlink_log: can't even alloc %u "
354 "bytes\n", pkt_size);
362 __nfulnl_send(struct nfulnl_instance *inst)
366 if (timer_pending(&inst->timer))
367 del_timer(&inst->timer);
373 inst->lastnlh->nlmsg_type = NLMSG_DONE;
378 status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT);
380 UDEBUG("netlink_unicast() failed\n");
381 /* FIXME: statistics */
386 inst->lastnlh = NULL;
391 static void nfulnl_timer(unsigned long data)
393 struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
395 UDEBUG("timer function called, flushing buffer\n");
397 spin_lock_bh(&inst->lock);
400 spin_unlock_bh(&inst->lock);
403 /* This is an inline function, we don't really care about a long
404 * list of arguments */
406 __build_packet_message(struct nfulnl_instance *inst,
407 const struct sk_buff *skb,
408 unsigned int data_len,
410 unsigned int hooknum,
411 const struct net_device *indev,
412 const struct net_device *outdev,
413 const struct nf_loginfo *li,
416 unsigned char *old_tail;
417 struct nfulnl_msg_packet_hdr pmsg;
418 struct nlmsghdr *nlh;
419 struct nfgenmsg *nfmsg;
424 old_tail = inst->skb->tail;
425 nlh = NLMSG_PUT(inst->skb, 0, 0,
426 NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
427 sizeof(struct nfgenmsg));
428 nfmsg = NLMSG_DATA(nlh);
429 nfmsg->nfgen_family = pf;
430 nfmsg->version = NFNETLINK_V0;
431 nfmsg->res_id = htons(inst->group_num);
433 pmsg.hw_protocol = htons(skb->protocol);
436 NFA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg);
439 int slen = strlen(prefix);
440 if (slen > NFULNL_PREFIXLEN)
441 slen = NFULNL_PREFIXLEN;
442 NFA_PUT(inst->skb, NFULA_PREFIX, slen, prefix);
446 tmp_uint = htonl(indev->ifindex);
447 #ifndef CONFIG_BRIDGE_NETFILTER
448 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint),
451 if (pf == PF_BRIDGE) {
452 /* Case 1: outdev is physical input device, we need to
453 * look for bridge group (when called from
454 * netfilter_bridge) */
455 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
456 sizeof(tmp_uint), &tmp_uint);
457 /* this is the bridge group "brX" */
458 tmp_uint = htonl(indev->br_port->br->dev->ifindex);
459 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
460 sizeof(tmp_uint), &tmp_uint);
462 /* Case 2: indev is bridge group, we need to look for
463 * physical device (when called from ipv4) */
464 NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV,
465 sizeof(tmp_uint), &tmp_uint);
466 if (skb->nf_bridge && skb->nf_bridge->physindev) {
468 htonl(skb->nf_bridge->physindev->ifindex);
469 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV,
470 sizeof(tmp_uint), &tmp_uint);
477 tmp_uint = htonl(outdev->ifindex);
478 #ifndef CONFIG_BRIDGE_NETFILTER
479 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint),
482 if (pf == PF_BRIDGE) {
483 /* Case 1: outdev is physical output device, we need to
484 * look for bridge group (when called from
485 * netfilter_bridge) */
486 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
487 sizeof(tmp_uint), &tmp_uint);
488 /* this is the bridge group "brX" */
489 tmp_uint = htonl(outdev->br_port->br->dev->ifindex);
490 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
491 sizeof(tmp_uint), &tmp_uint);
493 /* Case 2: indev is a bridge group, we need to look
494 * for physical device (when called from ipv4) */
495 NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
496 sizeof(tmp_uint), &tmp_uint);
497 if (skb->nf_bridge) {
499 htonl(skb->nf_bridge->physoutdev->ifindex);
500 NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
501 sizeof(tmp_uint), &tmp_uint);
508 tmp_uint = htonl(skb->nfmark);
509 NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint);
512 if (indev && skb->dev && skb->dev->hard_header_parse) {
513 struct nfulnl_msg_packet_hw phw;
516 skb->dev->hard_header_parse((struct sk_buff *)skb,
518 phw.hw_addrlen = htons(phw.hw_addrlen);
519 NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw);
522 if (skb->tstamp.off_sec) {
523 struct nfulnl_msg_packet_timestamp ts;
525 ts.sec = cpu_to_be64(skb->tstamp.off_sec);
526 ts.usec = cpu_to_be64(skb->tstamp.off_usec);
528 NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts);
533 read_lock_bh(&skb->sk->sk_callback_lock);
534 if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
535 u_int32_t uid = htonl(skb->sk->sk_socket->file->f_uid);
536 /* need to unlock here since NFA_PUT may goto */
537 read_unlock_bh(&skb->sk->sk_callback_lock);
538 NFA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid);
540 read_unlock_bh(&skb->sk->sk_callback_lock);
543 /* local sequence number */
544 if (inst->flags & NFULNL_CFG_F_SEQ) {
545 tmp_uint = htonl(inst->seq++);
546 NFA_PUT(inst->skb, NFULA_SEQ, sizeof(tmp_uint), &tmp_uint);
548 /* global sequence number */
549 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) {
550 tmp_uint = atomic_inc_return(&global_seq);
551 NFA_PUT(inst->skb, NFULA_SEQ_GLOBAL, sizeof(tmp_uint), &tmp_uint);
556 int size = NFA_LENGTH(data_len);
558 if (skb_tailroom(inst->skb) < (int)NFA_SPACE(data_len)) {
559 printk(KERN_WARNING "nfnetlink_log: no tailroom!\n");
563 nfa = (struct nfattr *)skb_put(inst->skb, NFA_ALIGN(size));
564 nfa->nfa_type = NFULA_PAYLOAD;
567 if (skb_copy_bits(skb, 0, NFA_DATA(nfa), data_len))
571 nlh->nlmsg_len = inst->skb->tail - old_tail;
575 UDEBUG("nlmsg_failure\n");
577 PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
581 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
583 static struct nf_loginfo default_loginfo = {
584 .type = NF_LOG_TYPE_ULOG,
594 /* log handler for internal netfilter logging api */
596 nfulnl_log_packet(unsigned int pf,
597 unsigned int hooknum,
598 const struct sk_buff *skb,
599 const struct net_device *in,
600 const struct net_device *out,
601 const struct nf_loginfo *li_user,
604 unsigned int size, data_len;
605 struct nfulnl_instance *inst;
606 const struct nf_loginfo *li;
607 unsigned int qthreshold;
608 unsigned int nlbufsiz;
610 if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
613 li = &default_loginfo;
615 inst = instance_lookup_get(li->u.ulog.group);
617 inst = instance_lookup_get(0);
619 PRINTR("nfnetlink_log: trying to log packet, "
620 "but no instance for group %u\n", li->u.ulog.group);
624 /* all macros expand to constant values at compile time */
625 /* FIXME: do we want to make the size calculation conditional based on
626 * what is actually present? way more branches and checks, but more
627 * memory efficient... */
628 size = NLMSG_SPACE(sizeof(struct nfgenmsg))
629 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr))
630 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
631 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
632 #ifdef CONFIG_BRIDGE_NETFILTER
633 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
634 + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */
636 + NFA_SPACE(sizeof(u_int32_t)) /* mark */
637 + NFA_SPACE(sizeof(u_int32_t)) /* uid */
638 + NFA_SPACE(NFULNL_PREFIXLEN) /* prefix */
639 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw))
640 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp));
642 UDEBUG("initial size=%u\n", size);
644 spin_lock_bh(&inst->lock);
646 if (inst->flags & NFULNL_CFG_F_SEQ)
647 size += NFA_SPACE(sizeof(u_int32_t));
648 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
649 size += NFA_SPACE(sizeof(u_int32_t));
651 qthreshold = inst->qthreshold;
652 /* per-rule qthreshold overrides per-instance */
653 if (qthreshold > li->u.ulog.qthreshold)
654 qthreshold = li->u.ulog.qthreshold;
656 switch (inst->copy_mode) {
657 case NFULNL_COPY_META:
658 case NFULNL_COPY_NONE:
662 case NFULNL_COPY_PACKET:
663 if (inst->copy_range == 0
664 || inst->copy_range > skb->len)
667 data_len = inst->copy_range;
669 size += NFA_SPACE(data_len);
670 UDEBUG("copy_packet, therefore size now %u\n", size);
674 spin_unlock_bh(&inst->lock);
679 if (size > inst->nlbufsiz)
682 nlbufsiz = inst->nlbufsiz;
685 if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) {
686 UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n",
687 inst->nlbufsiz, size);
690 } else if (inst->qlen >= qthreshold ||
691 size > skb_tailroom(inst->skb)) {
692 /* either the queue len is too high or we don't have
693 * enough room in the skb left. flush to userspace. */
694 UDEBUG("flushing old skb\n");
698 if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) {
699 UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n",
700 inst->nlbufsiz, size);
705 UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold);
708 __build_packet_message(inst, skb, data_len, pf,
709 hooknum, in, out, li, prefix);
711 /* timer_pending always called within inst->lock, so there
712 * is no chance of a race here */
713 if (!timer_pending(&inst->timer)) {
715 inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
716 add_timer(&inst->timer);
718 spin_unlock_bh(&inst->lock);
723 spin_unlock_bh(&inst->lock);
725 UDEBUG("error allocating skb\n");
726 /* FIXME: statistics */
730 nfulnl_rcv_nl_event(struct notifier_block *this,
731 unsigned long event, void *ptr)
733 struct netlink_notify *n = ptr;
735 if (event == NETLINK_URELEASE &&
736 n->protocol == NETLINK_NETFILTER && n->pid) {
739 /* destroy all instances for this pid */
740 write_lock_bh(&instances_lock);
741 for (i = 0; i < INSTANCE_BUCKETS; i++) {
742 struct hlist_node *tmp, *t2;
743 struct nfulnl_instance *inst;
744 struct hlist_head *head = &instance_table[i];
746 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
747 UDEBUG("node = %p\n", inst);
748 if (n->pid == inst->peer_pid)
749 __instance_destroy(inst);
752 write_unlock_bh(&instances_lock);
757 static struct notifier_block nfulnl_rtnl_notifier = {
758 .notifier_call = nfulnl_rcv_nl_event,
762 nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
763 struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp)
768 static struct nf_logger nfulnl_logger = {
769 .name = "nfnetlink_log",
770 .logfn = &nfulnl_log_packet,
774 static const int nfula_min[NFULA_MAX] = {
775 [NFULA_PACKET_HDR-1] = sizeof(struct nfulnl_msg_packet_hdr),
776 [NFULA_MARK-1] = sizeof(u_int32_t),
777 [NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp),
778 [NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t),
779 [NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t),
780 [NFULA_IFINDEX_PHYSINDEV-1] = sizeof(u_int32_t),
781 [NFULA_IFINDEX_PHYSOUTDEV-1] = sizeof(u_int32_t),
782 [NFULA_HWADDR-1] = sizeof(struct nfulnl_msg_packet_hw),
783 [NFULA_PAYLOAD-1] = 0,
784 [NFULA_PREFIX-1] = 0,
785 [NFULA_UID-1] = sizeof(u_int32_t),
786 [NFULA_SEQ-1] = sizeof(u_int32_t),
787 [NFULA_SEQ_GLOBAL-1] = sizeof(u_int32_t),
790 static const int nfula_cfg_min[NFULA_CFG_MAX] = {
791 [NFULA_CFG_CMD-1] = sizeof(struct nfulnl_msg_config_cmd),
792 [NFULA_CFG_MODE-1] = sizeof(struct nfulnl_msg_config_mode),
793 [NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t),
794 [NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t),
795 [NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t),
796 [NFULA_CFG_FLAGS-1] = sizeof(u_int16_t),
800 nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
801 struct nlmsghdr *nlh, struct nfattr *nfula[], int *errp)
803 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
804 u_int16_t group_num = ntohs(nfmsg->res_id);
805 struct nfulnl_instance *inst;
808 UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type));
810 if (nfattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) {
811 UDEBUG("bad attribute size\n");
815 inst = instance_lookup_get(group_num);
816 if (nfula[NFULA_CFG_CMD-1]) {
817 u_int8_t pf = nfmsg->nfgen_family;
818 struct nfulnl_msg_config_cmd *cmd;
819 cmd = NFA_DATA(nfula[NFULA_CFG_CMD-1]);
820 UDEBUG("found CFG_CMD for\n");
822 switch (cmd->command) {
823 case NFULNL_CFG_CMD_BIND:
829 inst = instance_create(group_num,
830 NETLINK_CB(skb).pid);
836 case NFULNL_CFG_CMD_UNBIND:
842 if (inst->peer_pid != NETLINK_CB(skb).pid) {
847 instance_destroy(inst);
849 case NFULNL_CFG_CMD_PF_BIND:
850 UDEBUG("registering log handler for pf=%u\n", pf);
851 ret = nf_log_register(pf, &nfulnl_logger);
853 case NFULNL_CFG_CMD_PF_UNBIND:
854 UDEBUG("unregistering log handler for pf=%u\n", pf);
855 /* This is a bug and a feature. We cannot unregister
856 * other handlers, like nfnetlink_inst can */
857 nf_log_unregister_pf(pf);
865 UDEBUG("no config command, and no instance for "
866 "group=%u pid=%u =>ENOENT\n",
867 group_num, NETLINK_CB(skb).pid);
872 if (inst->peer_pid != NETLINK_CB(skb).pid) {
873 UDEBUG("no config command, and wrong pid\n");
879 if (nfula[NFULA_CFG_MODE-1]) {
880 struct nfulnl_msg_config_mode *params;
881 params = NFA_DATA(nfula[NFULA_CFG_MODE-1]);
883 nfulnl_set_mode(inst, params->copy_mode,
884 ntohs(params->copy_range));
887 if (nfula[NFULA_CFG_TIMEOUT-1]) {
889 *(u_int32_t *)NFA_DATA(nfula[NFULA_CFG_TIMEOUT-1]);
891 nfulnl_set_timeout(inst, ntohl(timeout));
894 if (nfula[NFULA_CFG_NLBUFSIZ-1]) {
896 *(u_int32_t *)NFA_DATA(nfula[NFULA_CFG_NLBUFSIZ-1]);
898 nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
901 if (nfula[NFULA_CFG_QTHRESH-1]) {
903 *(u_int16_t *)NFA_DATA(nfula[NFULA_CFG_QTHRESH-1]);
905 nfulnl_set_qthresh(inst, ntohl(qthresh));
908 if (nfula[NFULA_CFG_FLAGS-1]) {
910 *(u_int16_t *)NFA_DATA(nfula[NFULA_CFG_FLAGS-1]);
911 nfulnl_set_flags(inst, ntohs(flags));
919 static struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
920 [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
921 .attr_count = NFULA_MAX, },
922 [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
923 .attr_count = NFULA_CFG_MAX, },
926 static struct nfnetlink_subsystem nfulnl_subsys = {
928 .subsys_id = NFNL_SUBSYS_ULOG,
929 .cb_count = NFULNL_MSG_MAX,
933 #ifdef CONFIG_PROC_FS
938 static struct hlist_node *get_first(struct seq_file *seq)
940 struct iter_state *st = seq->private;
945 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
946 if (!hlist_empty(&instance_table[st->bucket]))
947 return instance_table[st->bucket].first;
952 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
954 struct iter_state *st = seq->private;
958 if (++st->bucket >= INSTANCE_BUCKETS)
961 h = instance_table[st->bucket].first;
966 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
968 struct hlist_node *head;
969 head = get_first(seq);
972 while (pos && (head = get_next(seq, head)))
974 return pos ? NULL : head;
977 static void *seq_start(struct seq_file *seq, loff_t *pos)
979 read_lock_bh(&instances_lock);
980 return get_idx(seq, *pos);
983 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
986 return get_next(s, v);
989 static void seq_stop(struct seq_file *s, void *v)
991 read_unlock_bh(&instances_lock);
994 static int seq_show(struct seq_file *s, void *v)
996 const struct nfulnl_instance *inst = v;
998 return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
1000 inst->peer_pid, inst->qlen,
1001 inst->copy_mode, inst->copy_range,
1002 inst->flushtimeout, atomic_read(&inst->use));
1005 static struct seq_operations nful_seq_ops = {
1012 static int nful_open(struct inode *inode, struct file *file)
1014 struct seq_file *seq;
1015 struct iter_state *is;
1018 is = kzalloc(sizeof(*is), GFP_KERNEL);
1021 ret = seq_open(file, &nful_seq_ops);
1024 seq = file->private_data;
1032 static struct file_operations nful_file_ops = {
1033 .owner = THIS_MODULE,
1036 .llseek = seq_lseek,
1037 .release = seq_release_private,
1040 #endif /* PROC_FS */
1042 static int __init nfnetlink_log_init(void)
1044 int i, status = -ENOMEM;
1045 #ifdef CONFIG_PROC_FS
1046 struct proc_dir_entry *proc_nful;
1049 for (i = 0; i < INSTANCE_BUCKETS; i++)
1050 INIT_HLIST_HEAD(&instance_table[i]);
1052 /* it's not really all that important to have a random value, so
1053 * we can do this from the init function, even if there hasn't
1054 * been that much entropy yet */
1055 get_random_bytes(&hash_init, sizeof(hash_init));
1057 netlink_register_notifier(&nfulnl_rtnl_notifier);
1058 status = nfnetlink_subsys_register(&nfulnl_subsys);
1060 printk(KERN_ERR "log: failed to create netlink socket\n");
1061 goto cleanup_netlink_notifier;
1064 #ifdef CONFIG_PROC_FS
1065 proc_nful = create_proc_entry("nfnetlink_log", 0440,
1066 proc_net_netfilter);
1068 goto cleanup_subsys;
1069 proc_nful->proc_fops = &nful_file_ops;
1073 #ifdef CONFIG_PROC_FS
1075 nfnetlink_subsys_unregister(&nfulnl_subsys);
1077 cleanup_netlink_notifier:
1078 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1082 static void __exit nfnetlink_log_fini(void)
1084 nf_log_unregister_logger(&nfulnl_logger);
1085 #ifdef CONFIG_PROC_FS
1086 remove_proc_entry("nfnetlink_log", proc_net_netfilter);
1088 nfnetlink_subsys_unregister(&nfulnl_subsys);
1089 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1092 MODULE_DESCRIPTION("netfilter userspace logging");
1093 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1094 MODULE_LICENSE("GPL");
1095 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
1097 module_init(nfnetlink_log_init);
1098 module_exit(nfnetlink_log_fini);