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.
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 #include <linux/module.h>
19 #include <linux/skbuff.h>
20 #include <linux/if_arp.h>
21 #include <linux/init.h>
23 #include <linux/ipv6.h>
24 #include <linux/netdevice.h>
25 #include <linux/netfilter.h>
26 #include <linux/netfilter_bridge.h>
27 #include <net/netlink.h>
28 #include <linux/netfilter/nfnetlink.h>
29 #include <linux/netfilter/nfnetlink_log.h>
30 #include <linux/netfilter/nf_conntrack_common.h>
31 #include <linux/spinlock.h>
32 #include <linux/sysctl.h>
33 #include <linux/proc_fs.h>
34 #include <linux/security.h>
35 #include <linux/list.h>
36 #include <linux/slab.h>
38 #include <net/netfilter/nf_log.h>
39 #include <net/netns/generic.h>
40 #include <net/netfilter/nfnetlink_log.h>
42 #include <linux/atomic.h>
44 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
45 #include "../bridge/br_private.h"
48 #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
49 #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
50 #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
51 /* max packet size is limited by 16-bit struct nfattr nfa_len field */
52 #define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN)
54 #define PRINTR(x, args...) do { if (net_ratelimit()) \
55 printk(x, ## args); } while (0);
57 struct nfulnl_instance {
58 struct hlist_node hlist; /* global list of instances */
60 atomic_t use; /* use count */
62 unsigned int qlen; /* number of nlmsgs in skb */
63 struct sk_buff *skb; /* pre-allocatd skb */
64 struct timer_list timer;
66 struct user_namespace *peer_user_ns; /* User namespace of the peer process */
67 u32 peer_portid; /* PORTID of the peer process */
69 /* configurable parameters */
70 unsigned int flushtimeout; /* timeout until queue flush */
71 unsigned int nlbufsiz; /* netlink buffer allocation size */
72 unsigned int qthreshold; /* threshold of the queue */
74 u_int32_t seq; /* instance-local sequential counter */
75 u_int16_t group_num; /* number of this queue */
81 #define INSTANCE_BUCKETS 16
83 static int nfnl_log_net_id __read_mostly;
86 spinlock_t instances_lock;
87 struct hlist_head instance_table[INSTANCE_BUCKETS];
91 static struct nfnl_log_net *nfnl_log_pernet(struct net *net)
93 return net_generic(net, nfnl_log_net_id);
96 static inline u_int8_t instance_hashfn(u_int16_t group_num)
98 return ((group_num & 0xff) % INSTANCE_BUCKETS);
101 static struct nfulnl_instance *
102 __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num)
104 struct hlist_head *head;
105 struct nfulnl_instance *inst;
107 head = &log->instance_table[instance_hashfn(group_num)];
108 hlist_for_each_entry_rcu(inst, head, hlist) {
109 if (inst->group_num == group_num)
116 instance_get(struct nfulnl_instance *inst)
118 atomic_inc(&inst->use);
121 static struct nfulnl_instance *
122 instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num)
124 struct nfulnl_instance *inst;
127 inst = __instance_lookup(log, group_num);
128 if (inst && !atomic_inc_not_zero(&inst->use))
130 rcu_read_unlock_bh();
135 static void nfulnl_instance_free_rcu(struct rcu_head *head)
137 struct nfulnl_instance *inst =
138 container_of(head, struct nfulnl_instance, rcu);
142 module_put(THIS_MODULE);
146 instance_put(struct nfulnl_instance *inst)
148 if (inst && atomic_dec_and_test(&inst->use))
149 call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu);
152 static void nfulnl_timer(unsigned long data);
154 static struct nfulnl_instance *
155 instance_create(struct net *net, u_int16_t group_num,
156 u32 portid, struct user_namespace *user_ns)
158 struct nfulnl_instance *inst;
159 struct nfnl_log_net *log = nfnl_log_pernet(net);
162 spin_lock_bh(&log->instances_lock);
163 if (__instance_lookup(log, group_num)) {
168 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
174 if (!try_module_get(THIS_MODULE)) {
180 INIT_HLIST_NODE(&inst->hlist);
181 spin_lock_init(&inst->lock);
182 /* needs to be two, since we _put() after creation */
183 atomic_set(&inst->use, 2);
185 setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst);
187 inst->net = get_net(net);
188 inst->peer_user_ns = user_ns;
189 inst->peer_portid = portid;
190 inst->group_num = group_num;
192 inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
193 inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
194 inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
195 inst->copy_mode = NFULNL_COPY_PACKET;
196 inst->copy_range = NFULNL_COPY_RANGE_MAX;
198 hlist_add_head_rcu(&inst->hlist,
199 &log->instance_table[instance_hashfn(group_num)]);
202 spin_unlock_bh(&log->instances_lock);
207 spin_unlock_bh(&log->instances_lock);
211 static void __nfulnl_flush(struct nfulnl_instance *inst);
213 /* called with BH disabled */
215 __instance_destroy(struct nfulnl_instance *inst)
217 /* first pull it out of the global list */
218 hlist_del_rcu(&inst->hlist);
220 /* then flush all pending packets from skb */
222 spin_lock(&inst->lock);
224 /* lockless readers wont be able to use us */
225 inst->copy_mode = NFULNL_COPY_DISABLED;
228 __nfulnl_flush(inst);
229 spin_unlock(&inst->lock);
231 /* and finally put the refcount */
236 instance_destroy(struct nfnl_log_net *log,
237 struct nfulnl_instance *inst)
239 spin_lock_bh(&log->instances_lock);
240 __instance_destroy(inst);
241 spin_unlock_bh(&log->instances_lock);
245 nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
250 spin_lock_bh(&inst->lock);
253 case NFULNL_COPY_NONE:
254 case NFULNL_COPY_META:
255 inst->copy_mode = mode;
256 inst->copy_range = 0;
259 case NFULNL_COPY_PACKET:
260 inst->copy_mode = mode;
262 range = NFULNL_COPY_RANGE_MAX;
263 inst->copy_range = min_t(unsigned int,
264 range, NFULNL_COPY_RANGE_MAX);
272 spin_unlock_bh(&inst->lock);
278 nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
282 spin_lock_bh(&inst->lock);
283 if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
285 else if (nlbufsiz > 131072)
288 inst->nlbufsiz = nlbufsiz;
291 spin_unlock_bh(&inst->lock);
297 nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
299 spin_lock_bh(&inst->lock);
300 inst->flushtimeout = timeout;
301 spin_unlock_bh(&inst->lock);
307 nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
309 spin_lock_bh(&inst->lock);
310 inst->qthreshold = qthresh;
311 spin_unlock_bh(&inst->lock);
317 nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
319 spin_lock_bh(&inst->lock);
321 spin_unlock_bh(&inst->lock);
326 static struct sk_buff *
327 nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size,
328 unsigned int pkt_size)
333 /* alloc skb which should be big enough for a whole multipart
334 * message. WARNING: has to be <= 128k due to slab restrictions */
336 n = max(inst_size, pkt_size);
337 skb = nfnetlink_alloc_skb(net, n, peer_portid, GFP_ATOMIC);
340 /* try to allocate only as much as we need for current
343 skb = nfnetlink_alloc_skb(net, pkt_size,
344 peer_portid, GFP_ATOMIC);
352 __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),
359 if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n",
360 inst->skb->len, skb_tailroom(inst->skb))) {
361 kfree_skb(inst->skb);
365 nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid,
373 __nfulnl_flush(struct nfulnl_instance *inst)
375 /* timer holds a reference */
376 if (del_timer(&inst->timer))
383 nfulnl_timer(unsigned long data)
385 struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
387 spin_lock_bh(&inst->lock);
390 spin_unlock_bh(&inst->lock);
394 /* This is an inline function, we don't really care about a long
395 * list of arguments */
397 __build_packet_message(struct nfnl_log_net *log,
398 struct nfulnl_instance *inst,
399 const struct sk_buff *skb,
400 unsigned int data_len,
402 unsigned int hooknum,
403 const struct net_device *indev,
404 const struct net_device *outdev,
405 const char *prefix, unsigned int plen,
406 const struct nfnl_ct_hook *nfnl_ct,
407 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
409 struct nfulnl_msg_packet_hdr pmsg;
410 struct nlmsghdr *nlh;
411 struct nfgenmsg *nfmsg;
412 sk_buff_data_t old_tail = inst->skb->tail;
414 const unsigned char *hwhdrp;
416 nlh = nlmsg_put(inst->skb, 0, 0,
417 NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
418 sizeof(struct nfgenmsg), 0);
421 nfmsg = nlmsg_data(nlh);
422 nfmsg->nfgen_family = pf;
423 nfmsg->version = NFNETLINK_V0;
424 nfmsg->res_id = htons(inst->group_num);
426 memset(&pmsg, 0, sizeof(pmsg));
427 pmsg.hw_protocol = skb->protocol;
430 if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg))
431 goto nla_put_failure;
434 nla_put(inst->skb, NFULA_PREFIX, plen, prefix))
435 goto nla_put_failure;
438 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
439 if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
440 htonl(indev->ifindex)))
441 goto nla_put_failure;
443 if (pf == PF_BRIDGE) {
444 /* Case 1: outdev is physical input device, we need to
445 * look for bridge group (when called from
446 * netfilter_bridge) */
447 if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
448 htonl(indev->ifindex)) ||
449 /* this is the bridge group "brX" */
450 /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
451 nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
452 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
453 goto nla_put_failure;
455 struct net_device *physindev;
457 /* Case 2: indev is bridge group, we need to look for
458 * physical device (when called from ipv4) */
459 if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
460 htonl(indev->ifindex)))
461 goto nla_put_failure;
463 physindev = nf_bridge_get_physindev(skb);
465 nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
466 htonl(physindev->ifindex)))
467 goto nla_put_failure;
473 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
474 if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
475 htonl(outdev->ifindex)))
476 goto nla_put_failure;
478 if (pf == PF_BRIDGE) {
479 /* Case 1: outdev is physical output device, we need to
480 * look for bridge group (when called from
481 * netfilter_bridge) */
482 if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
483 htonl(outdev->ifindex)) ||
484 /* this is the bridge group "brX" */
485 /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
486 nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
487 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
488 goto nla_put_failure;
490 struct net_device *physoutdev;
492 /* Case 2: indev is a bridge group, we need to look
493 * for physical device (when called from ipv4) */
494 if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
495 htonl(outdev->ifindex)))
496 goto nla_put_failure;
498 physoutdev = nf_bridge_get_physoutdev(skb);
500 nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
501 htonl(physoutdev->ifindex)))
502 goto nla_put_failure;
508 nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark)))
509 goto nla_put_failure;
511 if (indev && skb->dev &&
512 skb->mac_header != skb->network_header) {
513 struct nfulnl_msg_packet_hw phw;
516 memset(&phw, 0, sizeof(phw));
517 len = dev_parse_header(skb, phw.hw_addr);
519 phw.hw_addrlen = htons(len);
520 if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw))
521 goto nla_put_failure;
525 if (indev && skb_mac_header_was_set(skb)) {
526 if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) ||
527 nla_put_be16(inst->skb, NFULA_HWLEN,
528 htons(skb->dev->hard_header_len)))
529 goto nla_put_failure;
531 hwhdrp = skb_mac_header(skb);
533 if (skb->dev->type == ARPHRD_SIT)
536 if (hwhdrp >= skb->head &&
537 nla_put(inst->skb, NFULA_HWHEADER,
538 skb->dev->hard_header_len, hwhdrp))
539 goto nla_put_failure;
542 if (skb->tstamp.tv64) {
543 struct nfulnl_msg_packet_timestamp ts;
544 struct timeval tv = ktime_to_timeval(skb->tstamp);
545 ts.sec = cpu_to_be64(tv.tv_sec);
546 ts.usec = cpu_to_be64(tv.tv_usec);
548 if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts))
549 goto nla_put_failure;
554 if (sk && sk_fullsock(sk)) {
555 read_lock_bh(&sk->sk_callback_lock);
556 if (sk->sk_socket && sk->sk_socket->file) {
557 struct file *file = sk->sk_socket->file;
558 const struct cred *cred = file->f_cred;
559 struct user_namespace *user_ns = inst->peer_user_ns;
560 __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid));
561 __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid));
562 read_unlock_bh(&sk->sk_callback_lock);
563 if (nla_put_be32(inst->skb, NFULA_UID, uid) ||
564 nla_put_be32(inst->skb, NFULA_GID, gid))
565 goto nla_put_failure;
567 read_unlock_bh(&sk->sk_callback_lock);
570 /* local sequence number */
571 if ((inst->flags & NFULNL_CFG_F_SEQ) &&
572 nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++)))
573 goto nla_put_failure;
575 /* global sequence number */
576 if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) &&
577 nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL,
578 htonl(atomic_inc_return(&log->global_seq))))
579 goto nla_put_failure;
581 if (ct && nfnl_ct->build(inst->skb, ct, ctinfo,
582 NFULA_CT, NFULA_CT_INFO) < 0)
583 goto nla_put_failure;
587 int size = nla_attr_size(data_len);
589 if (skb_tailroom(inst->skb) < nla_total_size(data_len))
590 goto nla_put_failure;
592 nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len));
593 nla->nla_type = NFULA_PAYLOAD;
596 if (skb_copy_bits(skb, 0, nla_data(nla), data_len))
600 nlh->nlmsg_len = inst->skb->tail - old_tail;
604 PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
608 static struct nf_loginfo default_loginfo = {
609 .type = NF_LOG_TYPE_ULOG,
619 /* log handler for internal netfilter logging api */
621 nfulnl_log_packet(struct net *net,
623 unsigned int hooknum,
624 const struct sk_buff *skb,
625 const struct net_device *in,
626 const struct net_device *out,
627 const struct nf_loginfo *li_user,
631 unsigned int data_len;
632 struct nfulnl_instance *inst;
633 const struct nf_loginfo *li;
634 unsigned int qthreshold;
636 struct nfnl_log_net *log = nfnl_log_pernet(net);
637 const struct nfnl_ct_hook *nfnl_ct = NULL;
638 struct nf_conn *ct = NULL;
639 enum ip_conntrack_info uninitialized_var(ctinfo);
641 if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
644 li = &default_loginfo;
646 inst = instance_lookup_get(log, li->u.ulog.group);
652 plen = strlen(prefix) + 1;
654 /* FIXME: do we want to make the size calculation conditional based on
655 * what is actually present? way more branches and checks, but more
656 * memory efficient... */
657 size = nlmsg_total_size(sizeof(struct nfgenmsg))
658 + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr))
659 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
660 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
661 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
662 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
663 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
665 + nla_total_size(sizeof(u_int32_t)) /* mark */
666 + nla_total_size(sizeof(u_int32_t)) /* uid */
667 + nla_total_size(sizeof(u_int32_t)) /* gid */
668 + nla_total_size(plen) /* prefix */
669 + nla_total_size(sizeof(struct nfulnl_msg_packet_hw))
670 + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp))
671 + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */
673 if (in && skb_mac_header_was_set(skb)) {
674 size += nla_total_size(skb->dev->hard_header_len)
675 + nla_total_size(sizeof(u_int16_t)) /* hwtype */
676 + nla_total_size(sizeof(u_int16_t)); /* hwlen */
679 spin_lock_bh(&inst->lock);
681 if (inst->flags & NFULNL_CFG_F_SEQ)
682 size += nla_total_size(sizeof(u_int32_t));
683 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
684 size += nla_total_size(sizeof(u_int32_t));
685 if (inst->flags & NFULNL_CFG_F_CONNTRACK) {
686 nfnl_ct = rcu_dereference(nfnl_ct_hook);
687 if (nfnl_ct != NULL) {
688 ct = nfnl_ct->get_ct(skb, &ctinfo);
690 size += nfnl_ct->build_size(ct);
694 qthreshold = inst->qthreshold;
695 /* per-rule qthreshold overrides per-instance */
696 if (li->u.ulog.qthreshold)
697 if (qthreshold > li->u.ulog.qthreshold)
698 qthreshold = li->u.ulog.qthreshold;
701 switch (inst->copy_mode) {
702 case NFULNL_COPY_META:
703 case NFULNL_COPY_NONE:
707 case NFULNL_COPY_PACKET:
708 if (inst->copy_range > skb->len)
711 data_len = inst->copy_range;
713 size += nla_total_size(data_len);
716 case NFULNL_COPY_DISABLED:
718 goto unlock_and_release;
721 if (inst->skb && size > skb_tailroom(inst->skb)) {
722 /* either the queue len is too high or we don't have
723 * enough room in the skb left. flush to userspace. */
724 __nfulnl_flush(inst);
728 inst->skb = nfulnl_alloc_skb(net, inst->peer_portid,
729 inst->nlbufsiz, size);
736 __build_packet_message(log, inst, skb, data_len, pf,
737 hooknum, in, out, prefix, plen,
738 nfnl_ct, ct, ctinfo);
740 if (inst->qlen >= qthreshold)
741 __nfulnl_flush(inst);
742 /* timer_pending always called within inst->lock, so there
743 * is no chance of a race here */
744 else if (!timer_pending(&inst->timer)) {
746 inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
747 add_timer(&inst->timer);
751 spin_unlock_bh(&inst->lock);
756 /* FIXME: statistics */
757 goto unlock_and_release;
759 EXPORT_SYMBOL_GPL(nfulnl_log_packet);
762 nfulnl_rcv_nl_event(struct notifier_block *this,
763 unsigned long event, void *ptr)
765 struct netlink_notify *n = ptr;
766 struct nfnl_log_net *log = nfnl_log_pernet(n->net);
768 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
771 /* destroy all instances for this portid */
772 spin_lock_bh(&log->instances_lock);
773 for (i = 0; i < INSTANCE_BUCKETS; i++) {
774 struct hlist_node *t2;
775 struct nfulnl_instance *inst;
776 struct hlist_head *head = &log->instance_table[i];
778 hlist_for_each_entry_safe(inst, t2, head, hlist) {
779 if (n->portid == inst->peer_portid)
780 __instance_destroy(inst);
783 spin_unlock_bh(&log->instances_lock);
788 static struct notifier_block nfulnl_rtnl_notifier = {
789 .notifier_call = nfulnl_rcv_nl_event,
793 nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
794 const struct nlmsghdr *nlh,
795 const struct nlattr * const nfqa[])
800 static struct nf_logger nfulnl_logger __read_mostly = {
801 .name = "nfnetlink_log",
802 .type = NF_LOG_TYPE_ULOG,
803 .logfn = &nfulnl_log_packet,
807 static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = {
808 [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) },
809 [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) },
810 [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 },
811 [NFULA_CFG_QTHRESH] = { .type = NLA_U32 },
812 [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 },
813 [NFULA_CFG_FLAGS] = { .type = NLA_U16 },
817 nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
818 const struct nlmsghdr *nlh,
819 const struct nlattr * const nfula[])
821 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
822 u_int16_t group_num = ntohs(nfmsg->res_id);
823 struct nfulnl_instance *inst;
824 struct nfulnl_msg_config_cmd *cmd = NULL;
825 struct net *net = sock_net(ctnl);
826 struct nfnl_log_net *log = nfnl_log_pernet(net);
829 if (nfula[NFULA_CFG_CMD]) {
830 u_int8_t pf = nfmsg->nfgen_family;
831 cmd = nla_data(nfula[NFULA_CFG_CMD]);
833 /* Commands without queue context */
834 switch (cmd->command) {
835 case NFULNL_CFG_CMD_PF_BIND:
836 return nf_log_bind_pf(net, pf, &nfulnl_logger);
837 case NFULNL_CFG_CMD_PF_UNBIND:
838 nf_log_unbind_pf(net, pf);
843 inst = instance_lookup_get(log, group_num);
844 if (inst && inst->peer_portid != NETLINK_CB(skb).portid) {
850 switch (cmd->command) {
851 case NFULNL_CFG_CMD_BIND:
857 inst = instance_create(net, group_num,
858 NETLINK_CB(skb).portid,
859 sk_user_ns(NETLINK_CB(skb).sk));
865 case NFULNL_CFG_CMD_UNBIND:
871 instance_destroy(log, inst);
882 if (nfula[NFULA_CFG_MODE]) {
883 struct nfulnl_msg_config_mode *params =
884 nla_data(nfula[NFULA_CFG_MODE]);
886 nfulnl_set_mode(inst, params->copy_mode,
887 ntohl(params->copy_range));
890 if (nfula[NFULA_CFG_TIMEOUT]) {
891 __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]);
893 nfulnl_set_timeout(inst, ntohl(timeout));
896 if (nfula[NFULA_CFG_NLBUFSIZ]) {
897 __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]);
899 nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
902 if (nfula[NFULA_CFG_QTHRESH]) {
903 __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]);
905 nfulnl_set_qthresh(inst, ntohl(qthresh));
908 if (nfula[NFULA_CFG_FLAGS]) {
909 u16 flags = ntohs(nla_get_be16(nfula[NFULA_CFG_FLAGS]));
911 if (flags & NFULNL_CFG_F_CONNTRACK &&
912 !rcu_access_pointer(nfnl_ct_hook)) {
913 #ifdef CONFIG_MODULES
914 nfnl_unlock(NFNL_SUBSYS_ULOG);
915 request_module("ip_conntrack_netlink");
916 nfnl_lock(NFNL_SUBSYS_ULOG);
917 if (rcu_access_pointer(nfnl_ct_hook)) {
926 nfulnl_set_flags(inst, flags);
935 static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
936 [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
937 .attr_count = NFULA_MAX, },
938 [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
939 .attr_count = NFULA_CFG_MAX,
940 .policy = nfula_cfg_policy },
943 static const struct nfnetlink_subsystem nfulnl_subsys = {
945 .subsys_id = NFNL_SUBSYS_ULOG,
946 .cb_count = NFULNL_MSG_MAX,
950 #ifdef CONFIG_PROC_FS
952 struct seq_net_private p;
956 static struct hlist_node *get_first(struct net *net, struct iter_state *st)
958 struct nfnl_log_net *log;
962 log = nfnl_log_pernet(net);
964 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
965 struct hlist_head *head = &log->instance_table[st->bucket];
967 if (!hlist_empty(head))
968 return rcu_dereference_bh(hlist_first_rcu(head));
973 static struct hlist_node *get_next(struct net *net, struct iter_state *st,
974 struct hlist_node *h)
976 h = rcu_dereference_bh(hlist_next_rcu(h));
978 struct nfnl_log_net *log;
979 struct hlist_head *head;
981 if (++st->bucket >= INSTANCE_BUCKETS)
984 log = nfnl_log_pernet(net);
985 head = &log->instance_table[st->bucket];
986 h = rcu_dereference_bh(hlist_first_rcu(head));
991 static struct hlist_node *get_idx(struct net *net, struct iter_state *st,
994 struct hlist_node *head;
995 head = get_first(net, st);
998 while (pos && (head = get_next(net, st, head)))
1000 return pos ? NULL : head;
1003 static void *seq_start(struct seq_file *s, loff_t *pos)
1007 return get_idx(seq_file_net(s), s->private, *pos);
1010 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1013 return get_next(seq_file_net(s), s->private, v);
1016 static void seq_stop(struct seq_file *s, void *v)
1019 rcu_read_unlock_bh();
1022 static int seq_show(struct seq_file *s, void *v)
1024 const struct nfulnl_instance *inst = v;
1026 seq_printf(s, "%5u %6u %5u %1u %5u %6u %2u\n",
1028 inst->peer_portid, inst->qlen,
1029 inst->copy_mode, inst->copy_range,
1030 inst->flushtimeout, atomic_read(&inst->use));
1035 static const struct seq_operations nful_seq_ops = {
1042 static int nful_open(struct inode *inode, struct file *file)
1044 return seq_open_net(inode, file, &nful_seq_ops,
1045 sizeof(struct iter_state));
1048 static const struct file_operations nful_file_ops = {
1049 .owner = THIS_MODULE,
1052 .llseek = seq_lseek,
1053 .release = seq_release_net,
1056 #endif /* PROC_FS */
1058 static int __net_init nfnl_log_net_init(struct net *net)
1061 struct nfnl_log_net *log = nfnl_log_pernet(net);
1063 for (i = 0; i < INSTANCE_BUCKETS; i++)
1064 INIT_HLIST_HEAD(&log->instance_table[i]);
1065 spin_lock_init(&log->instances_lock);
1067 #ifdef CONFIG_PROC_FS
1068 if (!proc_create("nfnetlink_log", 0440,
1069 net->nf.proc_netfilter, &nful_file_ops))
1075 static void __net_exit nfnl_log_net_exit(struct net *net)
1077 #ifdef CONFIG_PROC_FS
1078 remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter);
1080 nf_log_unset(net, &nfulnl_logger);
1083 static struct pernet_operations nfnl_log_net_ops = {
1084 .init = nfnl_log_net_init,
1085 .exit = nfnl_log_net_exit,
1086 .id = &nfnl_log_net_id,
1087 .size = sizeof(struct nfnl_log_net),
1090 static int __init nfnetlink_log_init(void)
1094 status = register_pernet_subsys(&nfnl_log_net_ops);
1096 pr_err("failed to register pernet ops\n");
1100 netlink_register_notifier(&nfulnl_rtnl_notifier);
1101 status = nfnetlink_subsys_register(&nfulnl_subsys);
1103 pr_err("failed to create netlink socket\n");
1104 goto cleanup_netlink_notifier;
1107 status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger);
1109 pr_err("failed to register logger\n");
1110 goto cleanup_subsys;
1116 nfnetlink_subsys_unregister(&nfulnl_subsys);
1117 cleanup_netlink_notifier:
1118 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1119 unregister_pernet_subsys(&nfnl_log_net_ops);
1124 static void __exit nfnetlink_log_fini(void)
1126 nf_log_unregister(&nfulnl_logger);
1127 nfnetlink_subsys_unregister(&nfulnl_subsys);
1128 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
1129 unregister_pernet_subsys(&nfnl_log_net_ops);
1132 MODULE_DESCRIPTION("netfilter userspace logging");
1133 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1134 MODULE_LICENSE("GPL");
1135 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
1136 MODULE_ALIAS_NF_LOGGER(AF_INET, 1);
1137 MODULE_ALIAS_NF_LOGGER(AF_INET6, 1);
1138 MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1);
1140 module_init(nfnetlink_log_init);
1141 module_exit(nfnetlink_log_fini);