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 #if IS_ENABLED(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 /* max packet size is limited by 16-bit struct nfattr nfa_len field */
47 #define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN)
49 #define PRINTR(x, args...) do { if (net_ratelimit()) \
50 printk(x, ## args); } while (0);
52 struct nfulnl_instance {
53 struct hlist_node hlist; /* global list of instances */
55 atomic_t use; /* use count */
57 unsigned int qlen; /* number of nlmsgs in skb */
58 struct sk_buff *skb; /* pre-allocatd skb */
59 struct timer_list timer;
61 struct user_namespace *peer_user_ns; /* User namespace of the peer process */
62 int peer_portid; /* PORTID 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 */
76 #define INSTANCE_BUCKETS 16
78 static int nfnl_log_net_id __read_mostly;
81 spinlock_t instances_lock;
82 struct hlist_head instance_table[INSTANCE_BUCKETS];
86 static struct nfnl_log_net *nfnl_log_pernet(struct net *net)
88 return net_generic(net, nfnl_log_net_id);
91 static inline u_int8_t instance_hashfn(u_int16_t group_num)
93 return ((group_num & 0xff) % INSTANCE_BUCKETS);
96 static struct nfulnl_instance *
97 __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num)
99 struct hlist_head *head;
100 struct nfulnl_instance *inst;
102 head = &log->instance_table[instance_hashfn(group_num)];
103 hlist_for_each_entry_rcu(inst, 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(struct nfnl_log_net *log, u_int16_t group_num)
119 struct nfulnl_instance *inst;
122 inst = __instance_lookup(log, group_num);
123 if (inst && !atomic_inc_not_zero(&inst->use))
125 rcu_read_unlock_bh();
130 static void nfulnl_instance_free_rcu(struct rcu_head *head)
132 struct nfulnl_instance *inst =
133 container_of(head, struct nfulnl_instance, rcu);
137 module_put(THIS_MODULE);
141 instance_put(struct nfulnl_instance *inst)
143 if (inst && atomic_dec_and_test(&inst->use))
144 call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu);
147 static void nfulnl_timer(unsigned long data);
149 static struct nfulnl_instance *
150 instance_create(struct net *net, u_int16_t group_num,
151 int portid, struct user_namespace *user_ns)
153 struct nfulnl_instance *inst;
154 struct nfnl_log_net *log = nfnl_log_pernet(net);
157 spin_lock_bh(&log->instances_lock);
158 if (__instance_lookup(log, group_num)) {
163 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
169 if (!try_module_get(THIS_MODULE)) {
175 INIT_HLIST_NODE(&inst->hlist);
176 spin_lock_init(&inst->lock);
177 /* needs to be two, since we _put() after creation */
178 atomic_set(&inst->use, 2);
180 setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst);
182 inst->net = get_net(net);
183 inst->peer_user_ns = user_ns;
184 inst->peer_portid = portid;
185 inst->group_num = group_num;
187 inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
188 inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
189 inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
190 inst->copy_mode = NFULNL_COPY_PACKET;
191 inst->copy_range = NFULNL_COPY_RANGE_MAX;
193 hlist_add_head_rcu(&inst->hlist,
194 &log->instance_table[instance_hashfn(group_num)]);
197 spin_unlock_bh(&log->instances_lock);
202 spin_unlock_bh(&log->instances_lock);
206 static void __nfulnl_flush(struct nfulnl_instance *inst);
208 /* called with BH disabled */
210 __instance_destroy(struct nfulnl_instance *inst)
212 /* first pull it out of the global list */
213 hlist_del_rcu(&inst->hlist);
215 /* then flush all pending packets from skb */
217 spin_lock(&inst->lock);
219 /* lockless readers wont be able to use us */
220 inst->copy_mode = NFULNL_COPY_DISABLED;
223 __nfulnl_flush(inst);
224 spin_unlock(&inst->lock);
226 /* and finally put the refcount */
231 instance_destroy(struct nfnl_log_net *log,
232 struct nfulnl_instance *inst)
234 spin_lock_bh(&log->instances_lock);
235 __instance_destroy(inst);
236 spin_unlock_bh(&log->instances_lock);
240 nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
245 spin_lock_bh(&inst->lock);
248 case NFULNL_COPY_NONE:
249 case NFULNL_COPY_META:
250 inst->copy_mode = mode;
251 inst->copy_range = 0;
254 case NFULNL_COPY_PACKET:
255 inst->copy_mode = mode;
257 range = NFULNL_COPY_RANGE_MAX;
258 inst->copy_range = min_t(unsigned int,
259 range, NFULNL_COPY_RANGE_MAX);
267 spin_unlock_bh(&inst->lock);
273 nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
277 spin_lock_bh(&inst->lock);
278 if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
280 else if (nlbufsiz > 131072)
283 inst->nlbufsiz = nlbufsiz;
286 spin_unlock_bh(&inst->lock);
292 nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
294 spin_lock_bh(&inst->lock);
295 inst->flushtimeout = timeout;
296 spin_unlock_bh(&inst->lock);
302 nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
304 spin_lock_bh(&inst->lock);
305 inst->qthreshold = qthresh;
306 spin_unlock_bh(&inst->lock);
312 nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
314 spin_lock_bh(&inst->lock);
316 spin_unlock_bh(&inst->lock);
321 static struct sk_buff *
322 nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size,
323 unsigned int pkt_size)
328 /* alloc skb which should be big enough for a whole multipart
329 * message. WARNING: has to be <= 128k due to slab restrictions */
331 n = max(inst_size, pkt_size);
332 skb = nfnetlink_alloc_skb(net, n, peer_portid, GFP_ATOMIC);
335 /* try to allocate only as much as we need for current
338 skb = nfnetlink_alloc_skb(net, pkt_size,
339 peer_portid, GFP_ATOMIC);
341 pr_err("nfnetlink_log: can't even alloc %u bytes\n",
350 __nfulnl_send(struct nfulnl_instance *inst)
354 if (inst->qlen > 1) {
355 struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0,
357 sizeof(struct nfgenmsg),
362 status = nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid,
372 __nfulnl_flush(struct nfulnl_instance *inst)
374 /* timer holds a reference */
375 if (del_timer(&inst->timer))
382 nfulnl_timer(unsigned long data)
384 struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
386 spin_lock_bh(&inst->lock);
389 spin_unlock_bh(&inst->lock);
393 /* This is an inline function, we don't really care about a long
394 * list of arguments */
396 __build_packet_message(struct nfnl_log_net *log,
397 struct nfulnl_instance *inst,
398 const struct sk_buff *skb,
399 unsigned int data_len,
401 unsigned int hooknum,
402 const struct net_device *indev,
403 const struct net_device *outdev,
404 const char *prefix, unsigned int plen)
406 struct nfulnl_msg_packet_hdr pmsg;
407 struct nlmsghdr *nlh;
408 struct nfgenmsg *nfmsg;
409 sk_buff_data_t old_tail = inst->skb->tail;
411 const unsigned char *hwhdrp;
413 nlh = nlmsg_put(inst->skb, 0, 0,
414 NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
415 sizeof(struct nfgenmsg), 0);
418 nfmsg = nlmsg_data(nlh);
419 nfmsg->nfgen_family = pf;
420 nfmsg->version = NFNETLINK_V0;
421 nfmsg->res_id = htons(inst->group_num);
423 memset(&pmsg, 0, sizeof(pmsg));
424 pmsg.hw_protocol = skb->protocol;
427 if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg))
428 goto nla_put_failure;
431 nla_put(inst->skb, NFULA_PREFIX, plen, prefix))
432 goto nla_put_failure;
435 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
436 if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
437 htonl(indev->ifindex)))
438 goto nla_put_failure;
440 if (pf == PF_BRIDGE) {
441 /* Case 1: outdev is physical input device, we need to
442 * look for bridge group (when called from
443 * netfilter_bridge) */
444 if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
445 htonl(indev->ifindex)) ||
446 /* this is the bridge group "brX" */
447 /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
448 nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
449 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
450 goto nla_put_failure;
452 /* Case 2: indev is bridge group, we need to look for
453 * physical device (when called from ipv4) */
454 if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
455 htonl(indev->ifindex)))
456 goto nla_put_failure;
457 if (skb->nf_bridge && skb->nf_bridge->physindev &&
458 nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
459 htonl(skb->nf_bridge->physindev->ifindex)))
460 goto nla_put_failure;
466 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
467 if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
468 htonl(outdev->ifindex)))
469 goto nla_put_failure;
471 if (pf == PF_BRIDGE) {
472 /* Case 1: outdev is physical output device, we need to
473 * look for bridge group (when called from
474 * netfilter_bridge) */
475 if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
476 htonl(outdev->ifindex)) ||
477 /* this is the bridge group "brX" */
478 /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
479 nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
480 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
481 goto nla_put_failure;
483 /* Case 2: indev is a bridge group, we need to look
484 * for physical device (when called from ipv4) */
485 if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
486 htonl(outdev->ifindex)))
487 goto nla_put_failure;
488 if (skb->nf_bridge && skb->nf_bridge->physoutdev &&
489 nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
490 htonl(skb->nf_bridge->physoutdev->ifindex)))
491 goto nla_put_failure;
497 nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark)))
498 goto nla_put_failure;
500 if (indev && skb->dev &&
501 skb->mac_header != skb->network_header) {
502 struct nfulnl_msg_packet_hw phw;
505 memset(&phw, 0, sizeof(phw));
506 len = dev_parse_header(skb, phw.hw_addr);
508 phw.hw_addrlen = htons(len);
509 if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw))
510 goto nla_put_failure;
514 if (indev && skb_mac_header_was_set(skb)) {
515 if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) ||
516 nla_put_be16(inst->skb, NFULA_HWLEN,
517 htons(skb->dev->hard_header_len)))
518 goto nla_put_failure;
520 hwhdrp = skb_mac_header(skb);
522 if (skb->dev->type == ARPHRD_SIT)
525 if (hwhdrp >= skb->head &&
526 nla_put(inst->skb, NFULA_HWHEADER,
527 skb->dev->hard_header_len, hwhdrp))
528 goto nla_put_failure;
531 if (skb->tstamp.tv64) {
532 struct nfulnl_msg_packet_timestamp ts;
533 struct timeval tv = ktime_to_timeval(skb->tstamp);
534 ts.sec = cpu_to_be64(tv.tv_sec);
535 ts.usec = cpu_to_be64(tv.tv_usec);
537 if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts))
538 goto nla_put_failure;
543 if (sk && sk->sk_state != TCP_TIME_WAIT) {
544 read_lock_bh(&sk->sk_callback_lock);
545 if (sk->sk_socket && sk->sk_socket->file) {
546 struct file *file = sk->sk_socket->file;
547 const struct cred *cred = file->f_cred;
548 struct user_namespace *user_ns = inst->peer_user_ns;
549 __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid));
550 __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid));
551 read_unlock_bh(&sk->sk_callback_lock);
552 if (nla_put_be32(inst->skb, NFULA_UID, uid) ||
553 nla_put_be32(inst->skb, NFULA_GID, gid))
554 goto nla_put_failure;
556 read_unlock_bh(&sk->sk_callback_lock);
559 /* local sequence number */
560 if ((inst->flags & NFULNL_CFG_F_SEQ) &&
561 nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++)))
562 goto nla_put_failure;
564 /* global sequence number */
565 if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) &&
566 nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL,
567 htonl(atomic_inc_return(&log->global_seq))))
568 goto nla_put_failure;
572 int size = nla_attr_size(data_len);
574 if (skb_tailroom(inst->skb) < nla_total_size(data_len)) {
575 printk(KERN_WARNING "nfnetlink_log: no tailroom!\n");
579 nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len));
580 nla->nla_type = NFULA_PAYLOAD;
583 if (skb_copy_bits(skb, 0, nla_data(nla), data_len))
587 nlh->nlmsg_len = inst->skb->tail - old_tail;
591 PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
595 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
597 static struct nf_loginfo default_loginfo = {
598 .type = NF_LOG_TYPE_ULOG,
608 /* log handler for internal netfilter logging api */
610 nfulnl_log_packet(struct net *net,
612 unsigned int hooknum,
613 const struct sk_buff *skb,
614 const struct net_device *in,
615 const struct net_device *out,
616 const struct nf_loginfo *li_user,
619 unsigned int size, data_len;
620 struct nfulnl_instance *inst;
621 const struct nf_loginfo *li;
622 unsigned int qthreshold;
624 struct nfnl_log_net *log = nfnl_log_pernet(net);
626 if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
629 li = &default_loginfo;
631 inst = instance_lookup_get(log, li->u.ulog.group);
637 plen = strlen(prefix) + 1;
639 /* FIXME: do we want to make the size calculation conditional based on
640 * what is actually present? way more branches and checks, but more
641 * memory efficient... */
642 size = nlmsg_total_size(sizeof(struct nfgenmsg))
643 + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr))
644 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
645 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
646 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
647 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
648 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
650 + nla_total_size(sizeof(u_int32_t)) /* mark */
651 + nla_total_size(sizeof(u_int32_t)) /* uid */
652 + nla_total_size(sizeof(u_int32_t)) /* gid */
653 + nla_total_size(plen) /* prefix */
654 + nla_total_size(sizeof(struct nfulnl_msg_packet_hw))
655 + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp))
656 + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */
658 if (in && skb_mac_header_was_set(skb)) {
659 size += nla_total_size(skb->dev->hard_header_len)
660 + nla_total_size(sizeof(u_int16_t)) /* hwtype */
661 + nla_total_size(sizeof(u_int16_t)); /* hwlen */
664 spin_lock_bh(&inst->lock);
666 if (inst->flags & NFULNL_CFG_F_SEQ)
667 size += nla_total_size(sizeof(u_int32_t));
668 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
669 size += nla_total_size(sizeof(u_int32_t));
671 qthreshold = inst->qthreshold;
672 /* per-rule qthreshold overrides per-instance */
673 if (li->u.ulog.qthreshold)
674 if (qthreshold > li->u.ulog.qthreshold)
675 qthreshold = li->u.ulog.qthreshold;
678 switch (inst->copy_mode) {
679 case NFULNL_COPY_META:
680 case NFULNL_COPY_NONE:
684 case NFULNL_COPY_PACKET:
685 if (inst->copy_range > skb->len)
688 data_len = inst->copy_range;
690 size += nla_total_size(data_len);
693 case NFULNL_COPY_DISABLED:
695 goto unlock_and_release;
698 if (inst->skb && size > skb_tailroom(inst->skb)) {
699 /* either the queue len is too high or we don't have
700 * enough room in the skb left. flush to userspace. */
701 __nfulnl_flush(inst);
705 inst->skb = nfulnl_alloc_skb(net, inst->peer_portid,
706 inst->nlbufsiz, size);
713 __build_packet_message(log, inst, skb, data_len, pf,
714 hooknum, in, out, prefix, plen);
716 if (inst->qlen >= qthreshold)
717 __nfulnl_flush(inst);
718 /* timer_pending always called within inst->lock, so there
719 * is no chance of a race here */
720 else if (!timer_pending(&inst->timer)) {
722 inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
723 add_timer(&inst->timer);
727 spin_unlock_bh(&inst->lock);
732 /* FIXME: statistics */
733 goto unlock_and_release;
735 EXPORT_SYMBOL_GPL(nfulnl_log_packet);
738 nfulnl_rcv_nl_event(struct notifier_block *this,
739 unsigned long event, void *ptr)
741 struct netlink_notify *n = ptr;
742 struct nfnl_log_net *log = nfnl_log_pernet(n->net);
744 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
747 /* destroy all instances for this portid */
748 spin_lock_bh(&log->instances_lock);
749 for (i = 0; i < INSTANCE_BUCKETS; i++) {
750 struct hlist_node *t2;
751 struct nfulnl_instance *inst;
752 struct hlist_head *head = &log->instance_table[i];
754 hlist_for_each_entry_safe(inst, t2, head, hlist) {
755 if (n->portid == inst->peer_portid)
756 __instance_destroy(inst);
759 spin_unlock_bh(&log->instances_lock);
764 static struct notifier_block nfulnl_rtnl_notifier = {
765 .notifier_call = nfulnl_rcv_nl_event,
769 nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
770 const struct nlmsghdr *nlh,
771 const struct nlattr * const nfqa[])
776 static struct nf_logger nfulnl_logger __read_mostly = {
777 .name = "nfnetlink_log",
778 .type = NF_LOG_TYPE_ULOG,
779 .logfn = &nfulnl_log_packet,
783 static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = {
784 [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) },
785 [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) },
786 [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 },
787 [NFULA_CFG_QTHRESH] = { .type = NLA_U32 },
788 [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 },
789 [NFULA_CFG_FLAGS] = { .type = NLA_U16 },
793 nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
794 const struct nlmsghdr *nlh,
795 const struct nlattr * const nfula[])
797 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
798 u_int16_t group_num = ntohs(nfmsg->res_id);
799 struct nfulnl_instance *inst;
800 struct nfulnl_msg_config_cmd *cmd = NULL;
801 struct net *net = sock_net(ctnl);
802 struct nfnl_log_net *log = nfnl_log_pernet(net);
805 if (nfula[NFULA_CFG_CMD]) {
806 u_int8_t pf = nfmsg->nfgen_family;
807 cmd = nla_data(nfula[NFULA_CFG_CMD]);
809 /* Commands without queue context */
810 switch (cmd->command) {
811 case NFULNL_CFG_CMD_PF_BIND:
812 return nf_log_bind_pf(net, pf, &nfulnl_logger);
813 case NFULNL_CFG_CMD_PF_UNBIND:
814 nf_log_unbind_pf(net, pf);
819 inst = instance_lookup_get(log, group_num);
820 if (inst && inst->peer_portid != NETLINK_CB(skb).portid) {
826 switch (cmd->command) {
827 case NFULNL_CFG_CMD_BIND:
833 inst = instance_create(net, group_num,
834 NETLINK_CB(skb).portid,
835 sk_user_ns(NETLINK_CB(skb).sk));
841 case NFULNL_CFG_CMD_UNBIND:
847 instance_destroy(log, inst);
855 if (nfula[NFULA_CFG_MODE]) {
856 struct nfulnl_msg_config_mode *params;
857 params = nla_data(nfula[NFULA_CFG_MODE]);
863 nfulnl_set_mode(inst, params->copy_mode,
864 ntohl(params->copy_range));
867 if (nfula[NFULA_CFG_TIMEOUT]) {
868 __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]);
874 nfulnl_set_timeout(inst, ntohl(timeout));
877 if (nfula[NFULA_CFG_NLBUFSIZ]) {
878 __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]);
884 nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
887 if (nfula[NFULA_CFG_QTHRESH]) {
888 __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]);
894 nfulnl_set_qthresh(inst, ntohl(qthresh));
897 if (nfula[NFULA_CFG_FLAGS]) {
898 __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]);
904 nfulnl_set_flags(inst, ntohs(flags));
913 static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
914 [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
915 .attr_count = NFULA_MAX, },
916 [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
917 .attr_count = NFULA_CFG_MAX,
918 .policy = nfula_cfg_policy },
921 static const struct nfnetlink_subsystem nfulnl_subsys = {
923 .subsys_id = NFNL_SUBSYS_ULOG,
924 .cb_count = NFULNL_MSG_MAX,
928 #ifdef CONFIG_PROC_FS
930 struct seq_net_private p;
934 static struct hlist_node *get_first(struct net *net, struct iter_state *st)
936 struct nfnl_log_net *log;
940 log = nfnl_log_pernet(net);
942 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
943 struct hlist_head *head = &log->instance_table[st->bucket];
945 if (!hlist_empty(head))
946 return rcu_dereference_bh(hlist_first_rcu(head));
951 static struct hlist_node *get_next(struct net *net, struct iter_state *st,
952 struct hlist_node *h)
954 h = rcu_dereference_bh(hlist_next_rcu(h));
956 struct nfnl_log_net *log;
957 struct hlist_head *head;
959 if (++st->bucket >= INSTANCE_BUCKETS)
962 log = nfnl_log_pernet(net);
963 head = &log->instance_table[st->bucket];
964 h = rcu_dereference_bh(hlist_first_rcu(head));
969 static struct hlist_node *get_idx(struct net *net, struct iter_state *st,
972 struct hlist_node *head;
973 head = get_first(net, st);
976 while (pos && (head = get_next(net, st, head)))
978 return pos ? NULL : head;
981 static void *seq_start(struct seq_file *s, loff_t *pos)
985 return get_idx(seq_file_net(s), s->private, *pos);
988 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
991 return get_next(seq_file_net(s), s->private, v);
994 static void seq_stop(struct seq_file *s, void *v)
997 rcu_read_unlock_bh();
1000 static int seq_show(struct seq_file *s, void *v)
1002 const struct nfulnl_instance *inst = v;
1004 return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
1006 inst->peer_portid, inst->qlen,
1007 inst->copy_mode, inst->copy_range,
1008 inst->flushtimeout, atomic_read(&inst->use));
1011 static const struct seq_operations nful_seq_ops = {
1018 static int nful_open(struct inode *inode, struct file *file)
1020 return seq_open_net(inode, file, &nful_seq_ops,
1021 sizeof(struct iter_state));
1024 static const struct file_operations nful_file_ops = {
1025 .owner = THIS_MODULE,
1028 .llseek = seq_lseek,
1029 .release = seq_release_net,
1032 #endif /* PROC_FS */
1034 static int __net_init nfnl_log_net_init(struct net *net)
1037 struct nfnl_log_net *log = nfnl_log_pernet(net);
1039 for (i = 0; i < INSTANCE_BUCKETS; i++)
1040 INIT_HLIST_HEAD(&log->instance_table[i]);
1041 spin_lock_init(&log->instances_lock);
1043 #ifdef CONFIG_PROC_FS
1044 if (!proc_create("nfnetlink_log", 0440,
1045 net->nf.proc_netfilter, &nful_file_ops))
1051 static void __net_exit nfnl_log_net_exit(struct net *net)
1053 #ifdef CONFIG_PROC_FS
1054 remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter);
1056 nf_log_unset(net, &nfulnl_logger);
1059 static struct pernet_operations nfnl_log_net_ops = {
1060 .init = nfnl_log_net_init,
1061 .exit = nfnl_log_net_exit,
1062 .id = &nfnl_log_net_id,
1063 .size = sizeof(struct nfnl_log_net),
1066 static int __init nfnetlink_log_init(void)
1068 int status = -ENOMEM;
1070 netlink_register_notifier(&nfulnl_rtnl_notifier);
1071 status = nfnetlink_subsys_register(&nfulnl_subsys);
1073 pr_err("log: failed to create netlink socket\n");
1074 goto cleanup_netlink_notifier;
1077 status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger);
1079 pr_err("log: failed to register logger\n");
1080 goto cleanup_subsys;
1083 status = register_pernet_subsys(&nfnl_log_net_ops);
1085 pr_err("log: failed to register pernet ops\n");
1086 goto cleanup_logger;
1091 nf_log_unregister(&nfulnl_logger);
1093 nfnetlink_subsys_unregister(&nfulnl_subsys);
1094 cleanup_netlink_notifier:
1095 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1099 static void __exit nfnetlink_log_fini(void)
1101 unregister_pernet_subsys(&nfnl_log_net_ops);
1102 nf_log_unregister(&nfulnl_logger);
1103 nfnetlink_subsys_unregister(&nfulnl_subsys);
1104 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1107 MODULE_DESCRIPTION("netfilter userspace logging");
1108 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1109 MODULE_LICENSE("GPL");
1110 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
1111 MODULE_ALIAS_NF_LOGGER(AF_INET, 1);
1112 MODULE_ALIAS_NF_LOGGER(AF_INET6, 1);
1113 MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1);
1115 module_init(nfnetlink_log_init);
1116 module_exit(nfnetlink_log_fini);