2 * This is a module which is used for logging packets to userspace via
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
6 * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
8 * Based on the old ipv4-only ipt_ULOG.c:
9 * (C) 2000-2004 by Harald Welte <laforge@netfilter.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
15 #include <linux/module.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/init.h>
20 #include <linux/ipv6.h>
21 #include <linux/netdevice.h>
22 #include <linux/netfilter.h>
23 #include <net/netlink.h>
24 #include <linux/netfilter/nfnetlink.h>
25 #include <linux/netfilter/nfnetlink_log.h>
26 #include <linux/spinlock.h>
27 #include <linux/sysctl.h>
28 #include <linux/proc_fs.h>
29 #include <linux/security.h>
30 #include <linux/list.h>
31 #include <linux/slab.h>
33 #include <net/netfilter/nf_log.h>
34 #include <net/netns/generic.h>
35 #include <net/netfilter/nfnetlink_log.h>
37 #include <linux/atomic.h>
39 #ifdef CONFIG_BRIDGE_NETFILTER
40 #include "../bridge/br_private.h"
43 #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
44 #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
45 #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
46 #define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */
48 #define PRINTR(x, args...) do { if (net_ratelimit()) \
49 printk(x, ## args); } while (0);
51 struct nfulnl_instance {
52 struct hlist_node hlist; /* global list of instances */
54 atomic_t use; /* use count */
56 unsigned int qlen; /* number of nlmsgs in skb */
57 struct sk_buff *skb; /* pre-allocatd skb */
58 struct timer_list timer;
60 struct user_namespace *peer_user_ns; /* User namespace of the peer process */
61 int peer_portid; /* PORTID of the peer process */
63 /* configurable parameters */
64 unsigned int flushtimeout; /* timeout until queue flush */
65 unsigned int nlbufsiz; /* netlink buffer allocation size */
66 unsigned int qthreshold; /* threshold of the queue */
68 u_int32_t seq; /* instance-local sequential counter */
69 u_int16_t group_num; /* number of this queue */
75 #define INSTANCE_BUCKETS 16
77 static int nfnl_log_net_id __read_mostly;
80 spinlock_t instances_lock;
81 struct hlist_head instance_table[INSTANCE_BUCKETS];
85 static struct nfnl_log_net *nfnl_log_pernet(struct net *net)
87 return net_generic(net, nfnl_log_net_id);
90 static inline u_int8_t instance_hashfn(u_int16_t group_num)
92 return ((group_num & 0xff) % INSTANCE_BUCKETS);
95 static struct nfulnl_instance *
96 __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num)
98 struct hlist_head *head;
99 struct nfulnl_instance *inst;
101 head = &log->instance_table[instance_hashfn(group_num)];
102 hlist_for_each_entry_rcu(inst, head, hlist) {
103 if (inst->group_num == group_num)
110 instance_get(struct nfulnl_instance *inst)
112 atomic_inc(&inst->use);
115 static struct nfulnl_instance *
116 instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num)
118 struct nfulnl_instance *inst;
121 inst = __instance_lookup(log, group_num);
122 if (inst && !atomic_inc_not_zero(&inst->use))
124 rcu_read_unlock_bh();
129 static void nfulnl_instance_free_rcu(struct rcu_head *head)
131 struct nfulnl_instance *inst =
132 container_of(head, struct nfulnl_instance, rcu);
136 module_put(THIS_MODULE);
140 instance_put(struct nfulnl_instance *inst)
142 if (inst && atomic_dec_and_test(&inst->use))
143 call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu);
146 static void nfulnl_timer(unsigned long data);
148 static struct nfulnl_instance *
149 instance_create(struct net *net, u_int16_t group_num,
150 int portid, struct user_namespace *user_ns)
152 struct nfulnl_instance *inst;
153 struct nfnl_log_net *log = nfnl_log_pernet(net);
156 spin_lock_bh(&log->instances_lock);
157 if (__instance_lookup(log, group_num)) {
162 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
168 if (!try_module_get(THIS_MODULE)) {
174 INIT_HLIST_NODE(&inst->hlist);
175 spin_lock_init(&inst->lock);
176 /* needs to be two, since we _put() after creation */
177 atomic_set(&inst->use, 2);
179 setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst);
181 inst->net = get_net(net);
182 inst->peer_user_ns = user_ns;
183 inst->peer_portid = portid;
184 inst->group_num = group_num;
186 inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
187 inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
188 inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
189 inst->copy_mode = NFULNL_COPY_PACKET;
190 inst->copy_range = NFULNL_COPY_RANGE_MAX;
192 hlist_add_head_rcu(&inst->hlist,
193 &log->instance_table[instance_hashfn(group_num)]);
196 spin_unlock_bh(&log->instances_lock);
201 spin_unlock_bh(&log->instances_lock);
205 static void __nfulnl_flush(struct nfulnl_instance *inst);
207 /* called with BH disabled */
209 __instance_destroy(struct nfulnl_instance *inst)
211 /* first pull it out of the global list */
212 hlist_del_rcu(&inst->hlist);
214 /* then flush all pending packets from skb */
216 spin_lock(&inst->lock);
218 /* lockless readers wont be able to use us */
219 inst->copy_mode = NFULNL_COPY_DISABLED;
222 __nfulnl_flush(inst);
223 spin_unlock(&inst->lock);
225 /* and finally put the refcount */
230 instance_destroy(struct nfnl_log_net *log,
231 struct nfulnl_instance *inst)
233 spin_lock_bh(&log->instances_lock);
234 __instance_destroy(inst);
235 spin_unlock_bh(&log->instances_lock);
239 nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
244 spin_lock_bh(&inst->lock);
247 case NFULNL_COPY_NONE:
248 case NFULNL_COPY_META:
249 inst->copy_mode = mode;
250 inst->copy_range = 0;
253 case NFULNL_COPY_PACKET:
254 inst->copy_mode = mode;
255 inst->copy_range = min_t(unsigned int,
256 range, NFULNL_COPY_RANGE_MAX);
264 spin_unlock_bh(&inst->lock);
270 nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
274 spin_lock_bh(&inst->lock);
275 if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
277 else if (nlbufsiz > 131072)
280 inst->nlbufsiz = nlbufsiz;
283 spin_unlock_bh(&inst->lock);
289 nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
291 spin_lock_bh(&inst->lock);
292 inst->flushtimeout = timeout;
293 spin_unlock_bh(&inst->lock);
299 nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
301 spin_lock_bh(&inst->lock);
302 inst->qthreshold = qthresh;
303 spin_unlock_bh(&inst->lock);
309 nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
311 spin_lock_bh(&inst->lock);
313 spin_unlock_bh(&inst->lock);
318 static struct sk_buff *
319 nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size,
320 unsigned int 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 = nfnetlink_alloc_skb(net, n, peer_portid, GFP_ATOMIC);
332 /* try to allocate only as much as we need for current
335 skb = nfnetlink_alloc_skb(net, pkt_size,
336 peer_portid, GFP_ATOMIC);
338 pr_err("nfnetlink_log: can't even alloc %u bytes\n",
347 __nfulnl_send(struct nfulnl_instance *inst)
351 if (inst->qlen > 1) {
352 struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0,
354 sizeof(struct nfgenmsg),
359 status = nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid,
369 __nfulnl_flush(struct nfulnl_instance *inst)
371 /* timer holds a reference */
372 if (del_timer(&inst->timer))
379 nfulnl_timer(unsigned long data)
381 struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
383 spin_lock_bh(&inst->lock);
386 spin_unlock_bh(&inst->lock);
390 /* This is an inline function, we don't really care about a long
391 * list of arguments */
393 __build_packet_message(struct nfnl_log_net *log,
394 struct nfulnl_instance *inst,
395 const struct sk_buff *skb,
396 unsigned int data_len,
398 unsigned int hooknum,
399 const struct net_device *indev,
400 const struct net_device *outdev,
401 const char *prefix, unsigned int plen)
403 struct nfulnl_msg_packet_hdr pmsg;
404 struct nlmsghdr *nlh;
405 struct nfgenmsg *nfmsg;
406 sk_buff_data_t old_tail = inst->skb->tail;
408 const unsigned char *hwhdrp;
410 nlh = nlmsg_put(inst->skb, 0, 0,
411 NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
412 sizeof(struct nfgenmsg), 0);
415 nfmsg = nlmsg_data(nlh);
416 nfmsg->nfgen_family = pf;
417 nfmsg->version = NFNETLINK_V0;
418 nfmsg->res_id = htons(inst->group_num);
420 memset(&pmsg, 0, sizeof(pmsg));
421 pmsg.hw_protocol = skb->protocol;
424 if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg))
425 goto nla_put_failure;
428 nla_put(inst->skb, NFULA_PREFIX, plen, prefix))
429 goto nla_put_failure;
432 #ifndef CONFIG_BRIDGE_NETFILTER
433 if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
434 htonl(indev->ifindex)))
435 goto nla_put_failure;
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 if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
442 htonl(indev->ifindex)) ||
443 /* this is the bridge group "brX" */
444 /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
445 nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
446 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
447 goto nla_put_failure;
449 /* Case 2: indev is bridge group, we need to look for
450 * physical device (when called from ipv4) */
451 if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
452 htonl(indev->ifindex)))
453 goto nla_put_failure;
454 if (skb->nf_bridge && skb->nf_bridge->physindev &&
455 nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
456 htonl(skb->nf_bridge->physindev->ifindex)))
457 goto nla_put_failure;
463 #ifndef CONFIG_BRIDGE_NETFILTER
464 if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
465 htonl(outdev->ifindex)))
466 goto nla_put_failure;
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 if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
473 htonl(outdev->ifindex)) ||
474 /* this is the bridge group "brX" */
475 /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
476 nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
477 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
478 goto nla_put_failure;
480 /* Case 2: indev is a bridge group, we need to look
481 * for physical device (when called from ipv4) */
482 if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
483 htonl(outdev->ifindex)))
484 goto nla_put_failure;
485 if (skb->nf_bridge && skb->nf_bridge->physoutdev &&
486 nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
487 htonl(skb->nf_bridge->physoutdev->ifindex)))
488 goto nla_put_failure;
494 nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark)))
495 goto nla_put_failure;
497 if (indev && skb->dev &&
498 skb->mac_header != skb->network_header) {
499 struct nfulnl_msg_packet_hw phw;
502 memset(&phw, 0, sizeof(phw));
503 len = dev_parse_header(skb, phw.hw_addr);
505 phw.hw_addrlen = htons(len);
506 if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw))
507 goto nla_put_failure;
511 if (indev && skb_mac_header_was_set(skb)) {
512 if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) ||
513 nla_put_be16(inst->skb, NFULA_HWLEN,
514 htons(skb->dev->hard_header_len)))
515 goto nla_put_failure;
517 hwhdrp = skb_mac_header(skb);
519 if (skb->dev->type == ARPHRD_SIT)
522 if (hwhdrp >= skb->head &&
523 nla_put(inst->skb, NFULA_HWHEADER,
524 skb->dev->hard_header_len, hwhdrp))
525 goto nla_put_failure;
528 if (skb->tstamp.tv64) {
529 struct nfulnl_msg_packet_timestamp ts;
530 struct timeval tv = ktime_to_timeval(skb->tstamp);
531 ts.sec = cpu_to_be64(tv.tv_sec);
532 ts.usec = cpu_to_be64(tv.tv_usec);
534 if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts))
535 goto nla_put_failure;
540 if (sk && sk->sk_state != TCP_TIME_WAIT) {
541 read_lock_bh(&sk->sk_callback_lock);
542 if (sk->sk_socket && sk->sk_socket->file) {
543 struct file *file = sk->sk_socket->file;
544 const struct cred *cred = file->f_cred;
545 struct user_namespace *user_ns = inst->peer_user_ns;
546 __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid));
547 __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid));
548 read_unlock_bh(&sk->sk_callback_lock);
549 if (nla_put_be32(inst->skb, NFULA_UID, uid) ||
550 nla_put_be32(inst->skb, NFULA_GID, gid))
551 goto nla_put_failure;
553 read_unlock_bh(&sk->sk_callback_lock);
556 /* local sequence number */
557 if ((inst->flags & NFULNL_CFG_F_SEQ) &&
558 nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++)))
559 goto nla_put_failure;
561 /* global sequence number */
562 if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) &&
563 nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL,
564 htonl(atomic_inc_return(&log->global_seq))))
565 goto nla_put_failure;
569 int size = nla_attr_size(data_len);
571 if (skb_tailroom(inst->skb) < nla_total_size(data_len)) {
572 printk(KERN_WARNING "nfnetlink_log: no tailroom!\n");
576 nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len));
577 nla->nla_type = NFULA_PAYLOAD;
580 if (skb_copy_bits(skb, 0, nla_data(nla), data_len))
584 nlh->nlmsg_len = inst->skb->tail - old_tail;
588 PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
592 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
594 static struct nf_loginfo default_loginfo = {
595 .type = NF_LOG_TYPE_ULOG,
605 /* log handler for internal netfilter logging api */
607 nfulnl_log_packet(struct net *net,
609 unsigned int hooknum,
610 const struct sk_buff *skb,
611 const struct net_device *in,
612 const struct net_device *out,
613 const struct nf_loginfo *li_user,
616 unsigned int size, data_len;
617 struct nfulnl_instance *inst;
618 const struct nf_loginfo *li;
619 unsigned int qthreshold;
621 struct nfnl_log_net *log = nfnl_log_pernet(net);
623 if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
626 li = &default_loginfo;
628 inst = instance_lookup_get(log, li->u.ulog.group);
634 plen = strlen(prefix) + 1;
636 /* FIXME: do we want to make the size calculation conditional based on
637 * what is actually present? way more branches and checks, but more
638 * memory efficient... */
639 size = nlmsg_total_size(sizeof(struct nfgenmsg))
640 + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr))
641 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
642 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
643 #ifdef CONFIG_BRIDGE_NETFILTER
644 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
645 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
647 + nla_total_size(sizeof(u_int32_t)) /* mark */
648 + nla_total_size(sizeof(u_int32_t)) /* uid */
649 + nla_total_size(sizeof(u_int32_t)) /* gid */
650 + nla_total_size(plen) /* prefix */
651 + nla_total_size(sizeof(struct nfulnl_msg_packet_hw))
652 + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp));
654 if (in && skb_mac_header_was_set(skb)) {
655 size += nla_total_size(skb->dev->hard_header_len)
656 + nla_total_size(sizeof(u_int16_t)) /* hwtype */
657 + nla_total_size(sizeof(u_int16_t)); /* hwlen */
660 spin_lock_bh(&inst->lock);
662 if (inst->flags & NFULNL_CFG_F_SEQ)
663 size += nla_total_size(sizeof(u_int32_t));
664 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
665 size += nla_total_size(sizeof(u_int32_t));
667 qthreshold = inst->qthreshold;
668 /* per-rule qthreshold overrides per-instance */
669 if (li->u.ulog.qthreshold)
670 if (qthreshold > li->u.ulog.qthreshold)
671 qthreshold = li->u.ulog.qthreshold;
674 switch (inst->copy_mode) {
675 case NFULNL_COPY_META:
676 case NFULNL_COPY_NONE:
680 case NFULNL_COPY_PACKET:
681 if (inst->copy_range == 0
682 || inst->copy_range > skb->len)
685 data_len = inst->copy_range;
687 size += nla_total_size(data_len);
690 case NFULNL_COPY_DISABLED:
692 goto unlock_and_release;
696 size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) {
697 /* either the queue len is too high or we don't have
698 * enough room in the skb left. flush to userspace. */
699 __nfulnl_flush(inst);
703 inst->skb = nfulnl_alloc_skb(net, inst->peer_portid,
704 inst->nlbufsiz, size);
711 __build_packet_message(log, inst, skb, data_len, pf,
712 hooknum, in, out, prefix, plen);
714 if (inst->qlen >= qthreshold)
715 __nfulnl_flush(inst);
716 /* timer_pending always called within inst->lock, so there
717 * is no chance of a race here */
718 else if (!timer_pending(&inst->timer)) {
720 inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
721 add_timer(&inst->timer);
725 spin_unlock_bh(&inst->lock);
730 /* FIXME: statistics */
731 goto unlock_and_release;
733 EXPORT_SYMBOL_GPL(nfulnl_log_packet);
736 nfulnl_rcv_nl_event(struct notifier_block *this,
737 unsigned long event, void *ptr)
739 struct netlink_notify *n = ptr;
740 struct nfnl_log_net *log = nfnl_log_pernet(n->net);
742 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
745 /* destroy all instances for this portid */
746 spin_lock_bh(&log->instances_lock);
747 for (i = 0; i < INSTANCE_BUCKETS; i++) {
748 struct hlist_node *t2;
749 struct nfulnl_instance *inst;
750 struct hlist_head *head = &log->instance_table[i];
752 hlist_for_each_entry_safe(inst, t2, head, hlist) {
753 if (n->portid == inst->peer_portid)
754 __instance_destroy(inst);
757 spin_unlock_bh(&log->instances_lock);
762 static struct notifier_block nfulnl_rtnl_notifier = {
763 .notifier_call = nfulnl_rcv_nl_event,
767 nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
768 const struct nlmsghdr *nlh,
769 const struct nlattr * const nfqa[])
774 static struct nf_logger nfulnl_logger __read_mostly = {
775 .name = "nfnetlink_log",
776 .logfn = &nfulnl_log_packet,
780 static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = {
781 [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) },
782 [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) },
783 [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 },
784 [NFULA_CFG_QTHRESH] = { .type = NLA_U32 },
785 [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 },
786 [NFULA_CFG_FLAGS] = { .type = NLA_U16 },
790 nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
791 const struct nlmsghdr *nlh,
792 const struct nlattr * const nfula[])
794 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
795 u_int16_t group_num = ntohs(nfmsg->res_id);
796 struct nfulnl_instance *inst;
797 struct nfulnl_msg_config_cmd *cmd = NULL;
798 struct net *net = sock_net(ctnl);
799 struct nfnl_log_net *log = nfnl_log_pernet(net);
802 if (nfula[NFULA_CFG_CMD]) {
803 u_int8_t pf = nfmsg->nfgen_family;
804 cmd = nla_data(nfula[NFULA_CFG_CMD]);
806 /* Commands without queue context */
807 switch (cmd->command) {
808 case NFULNL_CFG_CMD_PF_BIND:
809 return nf_log_bind_pf(net, pf, &nfulnl_logger);
810 case NFULNL_CFG_CMD_PF_UNBIND:
811 nf_log_unbind_pf(net, pf);
816 inst = instance_lookup_get(log, group_num);
817 if (inst && inst->peer_portid != NETLINK_CB(skb).portid) {
823 switch (cmd->command) {
824 case NFULNL_CFG_CMD_BIND:
830 inst = instance_create(net, group_num,
831 NETLINK_CB(skb).portid,
832 sk_user_ns(NETLINK_CB(skb).sk));
838 case NFULNL_CFG_CMD_UNBIND:
844 instance_destroy(log, inst);
852 if (nfula[NFULA_CFG_MODE]) {
853 struct nfulnl_msg_config_mode *params;
854 params = nla_data(nfula[NFULA_CFG_MODE]);
860 nfulnl_set_mode(inst, params->copy_mode,
861 ntohl(params->copy_range));
864 if (nfula[NFULA_CFG_TIMEOUT]) {
865 __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]);
871 nfulnl_set_timeout(inst, ntohl(timeout));
874 if (nfula[NFULA_CFG_NLBUFSIZ]) {
875 __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]);
881 nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
884 if (nfula[NFULA_CFG_QTHRESH]) {
885 __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]);
891 nfulnl_set_qthresh(inst, ntohl(qthresh));
894 if (nfula[NFULA_CFG_FLAGS]) {
895 __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]);
901 nfulnl_set_flags(inst, ntohs(flags));
910 static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
911 [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
912 .attr_count = NFULA_MAX, },
913 [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
914 .attr_count = NFULA_CFG_MAX,
915 .policy = nfula_cfg_policy },
918 static const struct nfnetlink_subsystem nfulnl_subsys = {
920 .subsys_id = NFNL_SUBSYS_ULOG,
921 .cb_count = NFULNL_MSG_MAX,
925 #ifdef CONFIG_PROC_FS
927 struct seq_net_private p;
931 static struct hlist_node *get_first(struct net *net, struct iter_state *st)
933 struct nfnl_log_net *log;
937 log = nfnl_log_pernet(net);
939 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
940 struct hlist_head *head = &log->instance_table[st->bucket];
942 if (!hlist_empty(head))
943 return rcu_dereference_bh(hlist_first_rcu(head));
948 static struct hlist_node *get_next(struct net *net, struct iter_state *st,
949 struct hlist_node *h)
951 h = rcu_dereference_bh(hlist_next_rcu(h));
953 struct nfnl_log_net *log;
954 struct hlist_head *head;
956 if (++st->bucket >= INSTANCE_BUCKETS)
959 log = nfnl_log_pernet(net);
960 head = &log->instance_table[st->bucket];
961 h = rcu_dereference_bh(hlist_first_rcu(head));
966 static struct hlist_node *get_idx(struct net *net, struct iter_state *st,
969 struct hlist_node *head;
970 head = get_first(net, st);
973 while (pos && (head = get_next(net, st, head)))
975 return pos ? NULL : head;
978 static void *seq_start(struct seq_file *s, loff_t *pos)
982 return get_idx(seq_file_net(s), s->private, *pos);
985 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
988 return get_next(seq_file_net(s), s->private, v);
991 static void seq_stop(struct seq_file *s, void *v)
994 rcu_read_unlock_bh();
997 static int seq_show(struct seq_file *s, void *v)
999 const struct nfulnl_instance *inst = v;
1001 return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
1003 inst->peer_portid, inst->qlen,
1004 inst->copy_mode, inst->copy_range,
1005 inst->flushtimeout, atomic_read(&inst->use));
1008 static const struct seq_operations nful_seq_ops = {
1015 static int nful_open(struct inode *inode, struct file *file)
1017 return seq_open_net(inode, file, &nful_seq_ops,
1018 sizeof(struct iter_state));
1021 static const struct file_operations nful_file_ops = {
1022 .owner = THIS_MODULE,
1025 .llseek = seq_lseek,
1026 .release = seq_release_net,
1029 #endif /* PROC_FS */
1031 static int __net_init nfnl_log_net_init(struct net *net)
1034 struct nfnl_log_net *log = nfnl_log_pernet(net);
1036 for (i = 0; i < INSTANCE_BUCKETS; i++)
1037 INIT_HLIST_HEAD(&log->instance_table[i]);
1038 spin_lock_init(&log->instances_lock);
1040 #ifdef CONFIG_PROC_FS
1041 if (!proc_create("nfnetlink_log", 0440,
1042 net->nf.proc_netfilter, &nful_file_ops))
1048 static void __net_exit nfnl_log_net_exit(struct net *net)
1050 #ifdef CONFIG_PROC_FS
1051 remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter);
1053 nf_log_unset(net, &nfulnl_logger);
1056 static struct pernet_operations nfnl_log_net_ops = {
1057 .init = nfnl_log_net_init,
1058 .exit = nfnl_log_net_exit,
1059 .id = &nfnl_log_net_id,
1060 .size = sizeof(struct nfnl_log_net),
1063 static int __init nfnetlink_log_init(void)
1065 int status = -ENOMEM;
1067 netlink_register_notifier(&nfulnl_rtnl_notifier);
1068 status = nfnetlink_subsys_register(&nfulnl_subsys);
1070 pr_err("log: failed to create netlink socket\n");
1071 goto cleanup_netlink_notifier;
1074 status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger);
1076 pr_err("log: failed to register logger\n");
1077 goto cleanup_subsys;
1080 status = register_pernet_subsys(&nfnl_log_net_ops);
1082 pr_err("log: failed to register pernet ops\n");
1083 goto cleanup_logger;
1088 nf_log_unregister(&nfulnl_logger);
1090 nfnetlink_subsys_unregister(&nfulnl_subsys);
1091 cleanup_netlink_notifier:
1092 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1096 static void __exit nfnetlink_log_fini(void)
1098 unregister_pernet_subsys(&nfnl_log_net_ops);
1099 nf_log_unregister(&nfulnl_logger);
1100 nfnetlink_subsys_unregister(&nfulnl_subsys);
1101 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1104 MODULE_DESCRIPTION("netfilter userspace logging");
1105 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1106 MODULE_LICENSE("GPL");
1107 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
1109 module_init(nfnetlink_log_init);
1110 module_exit(nfnetlink_log_fini);