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
)
352 if (inst
->qlen
> 1) {
353 struct nlmsghdr
*nlh
= nlmsg_put(inst
->skb
, 0, 0,
355 sizeof(struct nfgenmsg
),
357 if (WARN_ONCE(!nlh
, "bad nlskb size: %u, tailroom %d\n",
358 inst
->skb
->len
, skb_tailroom(inst
->skb
))) {
359 kfree_skb(inst
->skb
);
363 nfnetlink_unicast(inst
->skb
, inst
->net
, inst
->peer_portid
,
371 __nfulnl_flush(struct nfulnl_instance
*inst
)
373 /* timer holds a reference */
374 if (del_timer(&inst
->timer
))
381 nfulnl_timer(unsigned long data
)
383 struct nfulnl_instance
*inst
= (struct nfulnl_instance
*)data
;
385 spin_lock_bh(&inst
->lock
);
388 spin_unlock_bh(&inst
->lock
);
392 /* This is an inline function, we don't really care about a long
393 * list of arguments */
395 __build_packet_message(struct nfnl_log_net
*log
,
396 struct nfulnl_instance
*inst
,
397 const struct sk_buff
*skb
,
398 unsigned int data_len
,
400 unsigned int hooknum
,
401 const struct net_device
*indev
,
402 const struct net_device
*outdev
,
403 const char *prefix
, unsigned int plen
)
405 struct nfulnl_msg_packet_hdr pmsg
;
406 struct nlmsghdr
*nlh
;
407 struct nfgenmsg
*nfmsg
;
408 sk_buff_data_t old_tail
= inst
->skb
->tail
;
410 const unsigned char *hwhdrp
;
412 nlh
= nlmsg_put(inst
->skb
, 0, 0,
413 NFNL_SUBSYS_ULOG
<< 8 | NFULNL_MSG_PACKET
,
414 sizeof(struct nfgenmsg
), 0);
417 nfmsg
= nlmsg_data(nlh
);
418 nfmsg
->nfgen_family
= pf
;
419 nfmsg
->version
= NFNETLINK_V0
;
420 nfmsg
->res_id
= htons(inst
->group_num
);
422 memset(&pmsg
, 0, sizeof(pmsg
));
423 pmsg
.hw_protocol
= skb
->protocol
;
426 if (nla_put(inst
->skb
, NFULA_PACKET_HDR
, sizeof(pmsg
), &pmsg
))
427 goto nla_put_failure
;
430 nla_put(inst
->skb
, NFULA_PREFIX
, plen
, prefix
))
431 goto nla_put_failure
;
434 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
435 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_INDEV
,
436 htonl(indev
->ifindex
)))
437 goto nla_put_failure
;
439 if (pf
== PF_BRIDGE
) {
440 /* Case 1: outdev is physical input device, we need to
441 * look for bridge group (when called from
442 * netfilter_bridge) */
443 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_PHYSINDEV
,
444 htonl(indev
->ifindex
)) ||
445 /* this is the bridge group "brX" */
446 /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
447 nla_put_be32(inst
->skb
, NFULA_IFINDEX_INDEV
,
448 htonl(br_port_get_rcu(indev
)->br
->dev
->ifindex
)))
449 goto nla_put_failure
;
451 /* Case 2: indev is bridge group, we need to look for
452 * physical device (when called from ipv4) */
453 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_INDEV
,
454 htonl(indev
->ifindex
)))
455 goto nla_put_failure
;
456 if (skb
->nf_bridge
&& skb
->nf_bridge
->physindev
&&
457 nla_put_be32(inst
->skb
, NFULA_IFINDEX_PHYSINDEV
,
458 htonl(skb
->nf_bridge
->physindev
->ifindex
)))
459 goto nla_put_failure
;
465 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
466 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
467 htonl(outdev
->ifindex
)))
468 goto nla_put_failure
;
470 if (pf
== PF_BRIDGE
) {
471 /* Case 1: outdev is physical output device, we need to
472 * look for bridge group (when called from
473 * netfilter_bridge) */
474 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
475 htonl(outdev
->ifindex
)) ||
476 /* this is the bridge group "brX" */
477 /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
478 nla_put_be32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
479 htonl(br_port_get_rcu(outdev
)->br
->dev
->ifindex
)))
480 goto nla_put_failure
;
482 /* Case 2: indev is a bridge group, we need to look
483 * for physical device (when called from ipv4) */
484 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
485 htonl(outdev
->ifindex
)))
486 goto nla_put_failure
;
487 if (skb
->nf_bridge
&& skb
->nf_bridge
->physoutdev
&&
488 nla_put_be32(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
489 htonl(skb
->nf_bridge
->physoutdev
->ifindex
)))
490 goto nla_put_failure
;
496 nla_put_be32(inst
->skb
, NFULA_MARK
, htonl(skb
->mark
)))
497 goto nla_put_failure
;
499 if (indev
&& skb
->dev
&&
500 skb
->mac_header
!= skb
->network_header
) {
501 struct nfulnl_msg_packet_hw phw
;
504 memset(&phw
, 0, sizeof(phw
));
505 len
= dev_parse_header(skb
, phw
.hw_addr
);
507 phw
.hw_addrlen
= htons(len
);
508 if (nla_put(inst
->skb
, NFULA_HWADDR
, sizeof(phw
), &phw
))
509 goto nla_put_failure
;
513 if (indev
&& skb_mac_header_was_set(skb
)) {
514 if (nla_put_be16(inst
->skb
, NFULA_HWTYPE
, htons(skb
->dev
->type
)) ||
515 nla_put_be16(inst
->skb
, NFULA_HWLEN
,
516 htons(skb
->dev
->hard_header_len
)))
517 goto nla_put_failure
;
519 hwhdrp
= skb_mac_header(skb
);
521 if (skb
->dev
->type
== ARPHRD_SIT
)
524 if (hwhdrp
>= skb
->head
&&
525 nla_put(inst
->skb
, NFULA_HWHEADER
,
526 skb
->dev
->hard_header_len
, hwhdrp
))
527 goto nla_put_failure
;
530 if (skb
->tstamp
.tv64
) {
531 struct nfulnl_msg_packet_timestamp ts
;
532 struct timeval tv
= ktime_to_timeval(skb
->tstamp
);
533 ts
.sec
= cpu_to_be64(tv
.tv_sec
);
534 ts
.usec
= cpu_to_be64(tv
.tv_usec
);
536 if (nla_put(inst
->skb
, NFULA_TIMESTAMP
, sizeof(ts
), &ts
))
537 goto nla_put_failure
;
542 if (sk
&& sk
->sk_state
!= TCP_TIME_WAIT
) {
543 read_lock_bh(&sk
->sk_callback_lock
);
544 if (sk
->sk_socket
&& sk
->sk_socket
->file
) {
545 struct file
*file
= sk
->sk_socket
->file
;
546 const struct cred
*cred
= file
->f_cred
;
547 struct user_namespace
*user_ns
= inst
->peer_user_ns
;
548 __be32 uid
= htonl(from_kuid_munged(user_ns
, cred
->fsuid
));
549 __be32 gid
= htonl(from_kgid_munged(user_ns
, cred
->fsgid
));
550 read_unlock_bh(&sk
->sk_callback_lock
);
551 if (nla_put_be32(inst
->skb
, NFULA_UID
, uid
) ||
552 nla_put_be32(inst
->skb
, NFULA_GID
, gid
))
553 goto nla_put_failure
;
555 read_unlock_bh(&sk
->sk_callback_lock
);
558 /* local sequence number */
559 if ((inst
->flags
& NFULNL_CFG_F_SEQ
) &&
560 nla_put_be32(inst
->skb
, NFULA_SEQ
, htonl(inst
->seq
++)))
561 goto nla_put_failure
;
563 /* global sequence number */
564 if ((inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
) &&
565 nla_put_be32(inst
->skb
, NFULA_SEQ_GLOBAL
,
566 htonl(atomic_inc_return(&log
->global_seq
))))
567 goto nla_put_failure
;
571 int size
= nla_attr_size(data_len
);
573 if (skb_tailroom(inst
->skb
) < nla_total_size(data_len
)) {
574 printk(KERN_WARNING
"nfnetlink_log: no tailroom!\n");
578 nla
= (struct nlattr
*)skb_put(inst
->skb
, nla_total_size(data_len
));
579 nla
->nla_type
= NFULA_PAYLOAD
;
582 if (skb_copy_bits(skb
, 0, nla_data(nla
), data_len
))
586 nlh
->nlmsg_len
= inst
->skb
->tail
- old_tail
;
590 PRINTR(KERN_ERR
"nfnetlink_log: error creating log nlmsg\n");
594 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
596 static struct nf_loginfo default_loginfo
= {
597 .type
= NF_LOG_TYPE_ULOG
,
607 /* log handler for internal netfilter logging api */
609 nfulnl_log_packet(struct net
*net
,
611 unsigned int hooknum
,
612 const struct sk_buff
*skb
,
613 const struct net_device
*in
,
614 const struct net_device
*out
,
615 const struct nf_loginfo
*li_user
,
618 unsigned int size
, data_len
;
619 struct nfulnl_instance
*inst
;
620 const struct nf_loginfo
*li
;
621 unsigned int qthreshold
;
623 struct nfnl_log_net
*log
= nfnl_log_pernet(net
);
625 if (li_user
&& li_user
->type
== NF_LOG_TYPE_ULOG
)
628 li
= &default_loginfo
;
630 inst
= instance_lookup_get(log
, li
->u
.ulog
.group
);
636 plen
= strlen(prefix
) + 1;
638 /* FIXME: do we want to make the size calculation conditional based on
639 * what is actually present? way more branches and checks, but more
640 * memory efficient... */
641 size
= nlmsg_total_size(sizeof(struct nfgenmsg
))
642 + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr
))
643 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
644 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
645 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
646 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
647 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
649 + nla_total_size(sizeof(u_int32_t
)) /* mark */
650 + nla_total_size(sizeof(u_int32_t
)) /* uid */
651 + nla_total_size(sizeof(u_int32_t
)) /* gid */
652 + nla_total_size(plen
) /* prefix */
653 + nla_total_size(sizeof(struct nfulnl_msg_packet_hw
))
654 + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp
))
655 + nla_total_size(sizeof(struct nfgenmsg
)); /* NLMSG_DONE */
657 if (in
&& skb_mac_header_was_set(skb
)) {
658 size
+= nla_total_size(skb
->dev
->hard_header_len
)
659 + nla_total_size(sizeof(u_int16_t
)) /* hwtype */
660 + nla_total_size(sizeof(u_int16_t
)); /* hwlen */
663 spin_lock_bh(&inst
->lock
);
665 if (inst
->flags
& NFULNL_CFG_F_SEQ
)
666 size
+= nla_total_size(sizeof(u_int32_t
));
667 if (inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
)
668 size
+= nla_total_size(sizeof(u_int32_t
));
670 qthreshold
= inst
->qthreshold
;
671 /* per-rule qthreshold overrides per-instance */
672 if (li
->u
.ulog
.qthreshold
)
673 if (qthreshold
> li
->u
.ulog
.qthreshold
)
674 qthreshold
= li
->u
.ulog
.qthreshold
;
677 switch (inst
->copy_mode
) {
678 case NFULNL_COPY_META
:
679 case NFULNL_COPY_NONE
:
683 case NFULNL_COPY_PACKET
:
684 if (inst
->copy_range
> skb
->len
)
687 data_len
= inst
->copy_range
;
689 size
+= nla_total_size(data_len
);
692 case NFULNL_COPY_DISABLED
:
694 goto unlock_and_release
;
697 if (inst
->skb
&& size
> skb_tailroom(inst
->skb
)) {
698 /* either the queue len is too high or we don't have
699 * enough room in the skb left. flush to userspace. */
700 __nfulnl_flush(inst
);
704 inst
->skb
= nfulnl_alloc_skb(net
, inst
->peer_portid
,
705 inst
->nlbufsiz
, size
);
712 __build_packet_message(log
, inst
, skb
, data_len
, pf
,
713 hooknum
, in
, out
, prefix
, plen
);
715 if (inst
->qlen
>= qthreshold
)
716 __nfulnl_flush(inst
);
717 /* timer_pending always called within inst->lock, so there
718 * is no chance of a race here */
719 else if (!timer_pending(&inst
->timer
)) {
721 inst
->timer
.expires
= jiffies
+ (inst
->flushtimeout
*HZ
/100);
722 add_timer(&inst
->timer
);
726 spin_unlock_bh(&inst
->lock
);
731 /* FIXME: statistics */
732 goto unlock_and_release
;
734 EXPORT_SYMBOL_GPL(nfulnl_log_packet
);
737 nfulnl_rcv_nl_event(struct notifier_block
*this,
738 unsigned long event
, void *ptr
)
740 struct netlink_notify
*n
= ptr
;
741 struct nfnl_log_net
*log
= nfnl_log_pernet(n
->net
);
743 if (event
== NETLINK_URELEASE
&& n
->protocol
== NETLINK_NETFILTER
) {
746 /* destroy all instances for this portid */
747 spin_lock_bh(&log
->instances_lock
);
748 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
749 struct hlist_node
*t2
;
750 struct nfulnl_instance
*inst
;
751 struct hlist_head
*head
= &log
->instance_table
[i
];
753 hlist_for_each_entry_safe(inst
, t2
, head
, hlist
) {
754 if (n
->portid
== inst
->peer_portid
)
755 __instance_destroy(inst
);
758 spin_unlock_bh(&log
->instances_lock
);
763 static struct notifier_block nfulnl_rtnl_notifier
= {
764 .notifier_call
= nfulnl_rcv_nl_event
,
768 nfulnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
769 const struct nlmsghdr
*nlh
,
770 const struct nlattr
* const nfqa
[])
775 static struct nf_logger nfulnl_logger __read_mostly
= {
776 .name
= "nfnetlink_log",
777 .type
= NF_LOG_TYPE_ULOG
,
778 .logfn
= &nfulnl_log_packet
,
782 static const struct nla_policy nfula_cfg_policy
[NFULA_CFG_MAX
+1] = {
783 [NFULA_CFG_CMD
] = { .len
= sizeof(struct nfulnl_msg_config_cmd
) },
784 [NFULA_CFG_MODE
] = { .len
= sizeof(struct nfulnl_msg_config_mode
) },
785 [NFULA_CFG_TIMEOUT
] = { .type
= NLA_U32
},
786 [NFULA_CFG_QTHRESH
] = { .type
= NLA_U32
},
787 [NFULA_CFG_NLBUFSIZ
] = { .type
= NLA_U32
},
788 [NFULA_CFG_FLAGS
] = { .type
= NLA_U16
},
792 nfulnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
793 const struct nlmsghdr
*nlh
,
794 const struct nlattr
* const nfula
[])
796 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
797 u_int16_t group_num
= ntohs(nfmsg
->res_id
);
798 struct nfulnl_instance
*inst
;
799 struct nfulnl_msg_config_cmd
*cmd
= NULL
;
800 struct net
*net
= sock_net(ctnl
);
801 struct nfnl_log_net
*log
= nfnl_log_pernet(net
);
804 if (nfula
[NFULA_CFG_CMD
]) {
805 u_int8_t pf
= nfmsg
->nfgen_family
;
806 cmd
= nla_data(nfula
[NFULA_CFG_CMD
]);
808 /* Commands without queue context */
809 switch (cmd
->command
) {
810 case NFULNL_CFG_CMD_PF_BIND
:
811 return nf_log_bind_pf(net
, pf
, &nfulnl_logger
);
812 case NFULNL_CFG_CMD_PF_UNBIND
:
813 nf_log_unbind_pf(net
, pf
);
818 inst
= instance_lookup_get(log
, group_num
);
819 if (inst
&& inst
->peer_portid
!= NETLINK_CB(skb
).portid
) {
825 switch (cmd
->command
) {
826 case NFULNL_CFG_CMD_BIND
:
832 inst
= instance_create(net
, group_num
,
833 NETLINK_CB(skb
).portid
,
834 sk_user_ns(NETLINK_CB(skb
).sk
));
840 case NFULNL_CFG_CMD_UNBIND
:
846 instance_destroy(log
, inst
);
854 if (nfula
[NFULA_CFG_MODE
]) {
855 struct nfulnl_msg_config_mode
*params
;
856 params
= nla_data(nfula
[NFULA_CFG_MODE
]);
862 nfulnl_set_mode(inst
, params
->copy_mode
,
863 ntohl(params
->copy_range
));
866 if (nfula
[NFULA_CFG_TIMEOUT
]) {
867 __be32 timeout
= nla_get_be32(nfula
[NFULA_CFG_TIMEOUT
]);
873 nfulnl_set_timeout(inst
, ntohl(timeout
));
876 if (nfula
[NFULA_CFG_NLBUFSIZ
]) {
877 __be32 nlbufsiz
= nla_get_be32(nfula
[NFULA_CFG_NLBUFSIZ
]);
883 nfulnl_set_nlbufsiz(inst
, ntohl(nlbufsiz
));
886 if (nfula
[NFULA_CFG_QTHRESH
]) {
887 __be32 qthresh
= nla_get_be32(nfula
[NFULA_CFG_QTHRESH
]);
893 nfulnl_set_qthresh(inst
, ntohl(qthresh
));
896 if (nfula
[NFULA_CFG_FLAGS
]) {
897 __be16 flags
= nla_get_be16(nfula
[NFULA_CFG_FLAGS
]);
903 nfulnl_set_flags(inst
, ntohs(flags
));
912 static const struct nfnl_callback nfulnl_cb
[NFULNL_MSG_MAX
] = {
913 [NFULNL_MSG_PACKET
] = { .call
= nfulnl_recv_unsupp
,
914 .attr_count
= NFULA_MAX
, },
915 [NFULNL_MSG_CONFIG
] = { .call
= nfulnl_recv_config
,
916 .attr_count
= NFULA_CFG_MAX
,
917 .policy
= nfula_cfg_policy
},
920 static const struct nfnetlink_subsystem nfulnl_subsys
= {
922 .subsys_id
= NFNL_SUBSYS_ULOG
,
923 .cb_count
= NFULNL_MSG_MAX
,
927 #ifdef CONFIG_PROC_FS
929 struct seq_net_private p
;
933 static struct hlist_node
*get_first(struct net
*net
, struct iter_state
*st
)
935 struct nfnl_log_net
*log
;
939 log
= nfnl_log_pernet(net
);
941 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
942 struct hlist_head
*head
= &log
->instance_table
[st
->bucket
];
944 if (!hlist_empty(head
))
945 return rcu_dereference_bh(hlist_first_rcu(head
));
950 static struct hlist_node
*get_next(struct net
*net
, struct iter_state
*st
,
951 struct hlist_node
*h
)
953 h
= rcu_dereference_bh(hlist_next_rcu(h
));
955 struct nfnl_log_net
*log
;
956 struct hlist_head
*head
;
958 if (++st
->bucket
>= INSTANCE_BUCKETS
)
961 log
= nfnl_log_pernet(net
);
962 head
= &log
->instance_table
[st
->bucket
];
963 h
= rcu_dereference_bh(hlist_first_rcu(head
));
968 static struct hlist_node
*get_idx(struct net
*net
, struct iter_state
*st
,
971 struct hlist_node
*head
;
972 head
= get_first(net
, st
);
975 while (pos
&& (head
= get_next(net
, st
, head
)))
977 return pos
? NULL
: head
;
980 static void *seq_start(struct seq_file
*s
, loff_t
*pos
)
984 return get_idx(seq_file_net(s
), s
->private, *pos
);
987 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
990 return get_next(seq_file_net(s
), s
->private, v
);
993 static void seq_stop(struct seq_file
*s
, void *v
)
996 rcu_read_unlock_bh();
999 static int seq_show(struct seq_file
*s
, void *v
)
1001 const struct nfulnl_instance
*inst
= v
;
1003 return seq_printf(s
, "%5d %6d %5d %1d %5d %6d %2d\n",
1005 inst
->peer_portid
, inst
->qlen
,
1006 inst
->copy_mode
, inst
->copy_range
,
1007 inst
->flushtimeout
, atomic_read(&inst
->use
));
1010 static const struct seq_operations nful_seq_ops
= {
1017 static int nful_open(struct inode
*inode
, struct file
*file
)
1019 return seq_open_net(inode
, file
, &nful_seq_ops
,
1020 sizeof(struct iter_state
));
1023 static const struct file_operations nful_file_ops
= {
1024 .owner
= THIS_MODULE
,
1027 .llseek
= seq_lseek
,
1028 .release
= seq_release_net
,
1031 #endif /* PROC_FS */
1033 static int __net_init
nfnl_log_net_init(struct net
*net
)
1036 struct nfnl_log_net
*log
= nfnl_log_pernet(net
);
1038 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
1039 INIT_HLIST_HEAD(&log
->instance_table
[i
]);
1040 spin_lock_init(&log
->instances_lock
);
1042 #ifdef CONFIG_PROC_FS
1043 if (!proc_create("nfnetlink_log", 0440,
1044 net
->nf
.proc_netfilter
, &nful_file_ops
))
1050 static void __net_exit
nfnl_log_net_exit(struct net
*net
)
1052 #ifdef CONFIG_PROC_FS
1053 remove_proc_entry("nfnetlink_log", net
->nf
.proc_netfilter
);
1055 nf_log_unset(net
, &nfulnl_logger
);
1058 static struct pernet_operations nfnl_log_net_ops
= {
1059 .init
= nfnl_log_net_init
,
1060 .exit
= nfnl_log_net_exit
,
1061 .id
= &nfnl_log_net_id
,
1062 .size
= sizeof(struct nfnl_log_net
),
1065 static int __init
nfnetlink_log_init(void)
1067 int status
= -ENOMEM
;
1069 netlink_register_notifier(&nfulnl_rtnl_notifier
);
1070 status
= nfnetlink_subsys_register(&nfulnl_subsys
);
1072 pr_err("log: failed to create netlink socket\n");
1073 goto cleanup_netlink_notifier
;
1076 status
= nf_log_register(NFPROTO_UNSPEC
, &nfulnl_logger
);
1078 pr_err("log: failed to register logger\n");
1079 goto cleanup_subsys
;
1082 status
= register_pernet_subsys(&nfnl_log_net_ops
);
1084 pr_err("log: failed to register pernet ops\n");
1085 goto cleanup_logger
;
1090 nf_log_unregister(&nfulnl_logger
);
1092 nfnetlink_subsys_unregister(&nfulnl_subsys
);
1093 cleanup_netlink_notifier
:
1094 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
1098 static void __exit
nfnetlink_log_fini(void)
1100 unregister_pernet_subsys(&nfnl_log_net_ops
);
1101 nf_log_unregister(&nfulnl_logger
);
1102 nfnetlink_subsys_unregister(&nfulnl_subsys
);
1103 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
1106 MODULE_DESCRIPTION("netfilter userspace logging");
1107 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1108 MODULE_LICENSE("GPL");
1109 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG
);
1110 MODULE_ALIAS_NF_LOGGER(AF_INET
, 1);
1111 MODULE_ALIAS_NF_LOGGER(AF_INET6
, 1);
1112 MODULE_ALIAS_NF_LOGGER(AF_BRIDGE
, 1);
1114 module_init(nfnetlink_log_init
);
1115 module_exit(nfnetlink_log_fini
);