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/spinlock.h>
31 #include <linux/sysctl.h>
32 #include <linux/proc_fs.h>
33 #include <linux/security.h>
34 #include <linux/list.h>
35 #include <linux/slab.h>
37 #include <net/netfilter/nf_log.h>
38 #include <net/netns/generic.h>
39 #include <net/netfilter/nfnetlink_log.h>
41 #include <linux/atomic.h>
43 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
44 #include "../bridge/br_private.h"
47 #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
48 #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
49 #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
50 /* max packet size is limited by 16-bit struct nfattr nfa_len field */
51 #define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN)
53 #define PRINTR(x, args...) do { if (net_ratelimit()) \
54 printk(x, ## args); } while (0);
56 struct nfulnl_instance
{
57 struct hlist_node hlist
; /* global list of instances */
59 atomic_t use
; /* use count */
61 unsigned int qlen
; /* number of nlmsgs in skb */
62 struct sk_buff
*skb
; /* pre-allocatd skb */
63 struct timer_list timer
;
65 struct user_namespace
*peer_user_ns
; /* User namespace of the peer process */
66 u32 peer_portid
; /* PORTID of the peer process */
68 /* configurable parameters */
69 unsigned int flushtimeout
; /* timeout until queue flush */
70 unsigned int nlbufsiz
; /* netlink buffer allocation size */
71 unsigned int qthreshold
; /* threshold of the queue */
73 u_int32_t seq
; /* instance-local sequential counter */
74 u_int16_t group_num
; /* number of this queue */
80 #define INSTANCE_BUCKETS 16
82 static int nfnl_log_net_id __read_mostly
;
85 spinlock_t instances_lock
;
86 struct hlist_head instance_table
[INSTANCE_BUCKETS
];
90 static struct nfnl_log_net
*nfnl_log_pernet(struct net
*net
)
92 return net_generic(net
, nfnl_log_net_id
);
95 static inline u_int8_t
instance_hashfn(u_int16_t group_num
)
97 return ((group_num
& 0xff) % INSTANCE_BUCKETS
);
100 static struct nfulnl_instance
*
101 __instance_lookup(struct nfnl_log_net
*log
, u_int16_t group_num
)
103 struct hlist_head
*head
;
104 struct nfulnl_instance
*inst
;
106 head
= &log
->instance_table
[instance_hashfn(group_num
)];
107 hlist_for_each_entry_rcu(inst
, head
, hlist
) {
108 if (inst
->group_num
== group_num
)
115 instance_get(struct nfulnl_instance
*inst
)
117 atomic_inc(&inst
->use
);
120 static struct nfulnl_instance
*
121 instance_lookup_get(struct nfnl_log_net
*log
, u_int16_t group_num
)
123 struct nfulnl_instance
*inst
;
126 inst
= __instance_lookup(log
, group_num
);
127 if (inst
&& !atomic_inc_not_zero(&inst
->use
))
129 rcu_read_unlock_bh();
134 static void nfulnl_instance_free_rcu(struct rcu_head
*head
)
136 struct nfulnl_instance
*inst
=
137 container_of(head
, struct nfulnl_instance
, rcu
);
141 module_put(THIS_MODULE
);
145 instance_put(struct nfulnl_instance
*inst
)
147 if (inst
&& atomic_dec_and_test(&inst
->use
))
148 call_rcu_bh(&inst
->rcu
, nfulnl_instance_free_rcu
);
151 static void nfulnl_timer(unsigned long data
);
153 static struct nfulnl_instance
*
154 instance_create(struct net
*net
, u_int16_t group_num
,
155 u32 portid
, struct user_namespace
*user_ns
)
157 struct nfulnl_instance
*inst
;
158 struct nfnl_log_net
*log
= nfnl_log_pernet(net
);
161 spin_lock_bh(&log
->instances_lock
);
162 if (__instance_lookup(log
, group_num
)) {
167 inst
= kzalloc(sizeof(*inst
), GFP_ATOMIC
);
173 if (!try_module_get(THIS_MODULE
)) {
179 INIT_HLIST_NODE(&inst
->hlist
);
180 spin_lock_init(&inst
->lock
);
181 /* needs to be two, since we _put() after creation */
182 atomic_set(&inst
->use
, 2);
184 setup_timer(&inst
->timer
, nfulnl_timer
, (unsigned long)inst
);
186 inst
->net
= get_net(net
);
187 inst
->peer_user_ns
= user_ns
;
188 inst
->peer_portid
= portid
;
189 inst
->group_num
= group_num
;
191 inst
->qthreshold
= NFULNL_QTHRESH_DEFAULT
;
192 inst
->flushtimeout
= NFULNL_TIMEOUT_DEFAULT
;
193 inst
->nlbufsiz
= NFULNL_NLBUFSIZ_DEFAULT
;
194 inst
->copy_mode
= NFULNL_COPY_PACKET
;
195 inst
->copy_range
= NFULNL_COPY_RANGE_MAX
;
197 hlist_add_head_rcu(&inst
->hlist
,
198 &log
->instance_table
[instance_hashfn(group_num
)]);
201 spin_unlock_bh(&log
->instances_lock
);
206 spin_unlock_bh(&log
->instances_lock
);
210 static void __nfulnl_flush(struct nfulnl_instance
*inst
);
212 /* called with BH disabled */
214 __instance_destroy(struct nfulnl_instance
*inst
)
216 /* first pull it out of the global list */
217 hlist_del_rcu(&inst
->hlist
);
219 /* then flush all pending packets from skb */
221 spin_lock(&inst
->lock
);
223 /* lockless readers wont be able to use us */
224 inst
->copy_mode
= NFULNL_COPY_DISABLED
;
227 __nfulnl_flush(inst
);
228 spin_unlock(&inst
->lock
);
230 /* and finally put the refcount */
235 instance_destroy(struct nfnl_log_net
*log
,
236 struct nfulnl_instance
*inst
)
238 spin_lock_bh(&log
->instances_lock
);
239 __instance_destroy(inst
);
240 spin_unlock_bh(&log
->instances_lock
);
244 nfulnl_set_mode(struct nfulnl_instance
*inst
, u_int8_t mode
,
249 spin_lock_bh(&inst
->lock
);
252 case NFULNL_COPY_NONE
:
253 case NFULNL_COPY_META
:
254 inst
->copy_mode
= mode
;
255 inst
->copy_range
= 0;
258 case NFULNL_COPY_PACKET
:
259 inst
->copy_mode
= mode
;
261 range
= NFULNL_COPY_RANGE_MAX
;
262 inst
->copy_range
= min_t(unsigned int,
263 range
, NFULNL_COPY_RANGE_MAX
);
271 spin_unlock_bh(&inst
->lock
);
277 nfulnl_set_nlbufsiz(struct nfulnl_instance
*inst
, u_int32_t nlbufsiz
)
281 spin_lock_bh(&inst
->lock
);
282 if (nlbufsiz
< NFULNL_NLBUFSIZ_DEFAULT
)
284 else if (nlbufsiz
> 131072)
287 inst
->nlbufsiz
= nlbufsiz
;
290 spin_unlock_bh(&inst
->lock
);
296 nfulnl_set_timeout(struct nfulnl_instance
*inst
, u_int32_t timeout
)
298 spin_lock_bh(&inst
->lock
);
299 inst
->flushtimeout
= timeout
;
300 spin_unlock_bh(&inst
->lock
);
306 nfulnl_set_qthresh(struct nfulnl_instance
*inst
, u_int32_t qthresh
)
308 spin_lock_bh(&inst
->lock
);
309 inst
->qthreshold
= qthresh
;
310 spin_unlock_bh(&inst
->lock
);
316 nfulnl_set_flags(struct nfulnl_instance
*inst
, u_int16_t flags
)
318 spin_lock_bh(&inst
->lock
);
320 spin_unlock_bh(&inst
->lock
);
325 static struct sk_buff
*
326 nfulnl_alloc_skb(struct net
*net
, u32 peer_portid
, unsigned int inst_size
,
327 unsigned int pkt_size
)
332 /* alloc skb which should be big enough for a whole multipart
333 * message. WARNING: has to be <= 128k due to slab restrictions */
335 n
= max(inst_size
, pkt_size
);
336 skb
= nfnetlink_alloc_skb(net
, n
, peer_portid
, GFP_ATOMIC
);
339 /* try to allocate only as much as we need for current
342 skb
= nfnetlink_alloc_skb(net
, pkt_size
,
343 peer_portid
, GFP_ATOMIC
);
351 __nfulnl_send(struct nfulnl_instance
*inst
)
353 if (inst
->qlen
> 1) {
354 struct nlmsghdr
*nlh
= nlmsg_put(inst
->skb
, 0, 0,
356 sizeof(struct nfgenmsg
),
358 if (WARN_ONCE(!nlh
, "bad nlskb size: %u, tailroom %d\n",
359 inst
->skb
->len
, skb_tailroom(inst
->skb
))) {
360 kfree_skb(inst
->skb
);
364 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 struct net_device
*physindev
;
454 /* Case 2: indev is bridge group, we need to look for
455 * physical device (when called from ipv4) */
456 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_INDEV
,
457 htonl(indev
->ifindex
)))
458 goto nla_put_failure
;
460 physindev
= nf_bridge_get_physindev(skb
);
462 nla_put_be32(inst
->skb
, NFULA_IFINDEX_PHYSINDEV
,
463 htonl(physindev
->ifindex
)))
464 goto nla_put_failure
;
470 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
471 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
472 htonl(outdev
->ifindex
)))
473 goto nla_put_failure
;
475 if (pf
== PF_BRIDGE
) {
476 /* Case 1: outdev is physical output device, we need to
477 * look for bridge group (when called from
478 * netfilter_bridge) */
479 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
480 htonl(outdev
->ifindex
)) ||
481 /* this is the bridge group "brX" */
482 /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
483 nla_put_be32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
484 htonl(br_port_get_rcu(outdev
)->br
->dev
->ifindex
)))
485 goto nla_put_failure
;
487 struct net_device
*physoutdev
;
489 /* Case 2: indev is a bridge group, we need to look
490 * for physical device (when called from ipv4) */
491 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
492 htonl(outdev
->ifindex
)))
493 goto nla_put_failure
;
495 physoutdev
= nf_bridge_get_physoutdev(skb
);
497 nla_put_be32(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
498 htonl(physoutdev
->ifindex
)))
499 goto nla_put_failure
;
505 nla_put_be32(inst
->skb
, NFULA_MARK
, htonl(skb
->mark
)))
506 goto nla_put_failure
;
508 if (indev
&& skb
->dev
&&
509 skb
->mac_header
!= skb
->network_header
) {
510 struct nfulnl_msg_packet_hw phw
;
513 memset(&phw
, 0, sizeof(phw
));
514 len
= dev_parse_header(skb
, phw
.hw_addr
);
516 phw
.hw_addrlen
= htons(len
);
517 if (nla_put(inst
->skb
, NFULA_HWADDR
, sizeof(phw
), &phw
))
518 goto nla_put_failure
;
522 if (indev
&& skb_mac_header_was_set(skb
)) {
523 if (nla_put_be16(inst
->skb
, NFULA_HWTYPE
, htons(skb
->dev
->type
)) ||
524 nla_put_be16(inst
->skb
, NFULA_HWLEN
,
525 htons(skb
->dev
->hard_header_len
)))
526 goto nla_put_failure
;
528 hwhdrp
= skb_mac_header(skb
);
530 if (skb
->dev
->type
== ARPHRD_SIT
)
533 if (hwhdrp
>= skb
->head
&&
534 nla_put(inst
->skb
, NFULA_HWHEADER
,
535 skb
->dev
->hard_header_len
, hwhdrp
))
536 goto nla_put_failure
;
539 if (skb
->tstamp
.tv64
) {
540 struct nfulnl_msg_packet_timestamp ts
;
541 struct timeval tv
= ktime_to_timeval(skb
->tstamp
);
542 ts
.sec
= cpu_to_be64(tv
.tv_sec
);
543 ts
.usec
= cpu_to_be64(tv
.tv_usec
);
545 if (nla_put(inst
->skb
, NFULA_TIMESTAMP
, sizeof(ts
), &ts
))
546 goto nla_put_failure
;
551 if (sk
&& sk_fullsock(sk
)) {
552 read_lock_bh(&sk
->sk_callback_lock
);
553 if (sk
->sk_socket
&& sk
->sk_socket
->file
) {
554 struct file
*file
= sk
->sk_socket
->file
;
555 const struct cred
*cred
= file
->f_cred
;
556 struct user_namespace
*user_ns
= inst
->peer_user_ns
;
557 __be32 uid
= htonl(from_kuid_munged(user_ns
, cred
->fsuid
));
558 __be32 gid
= htonl(from_kgid_munged(user_ns
, cred
->fsgid
));
559 read_unlock_bh(&sk
->sk_callback_lock
);
560 if (nla_put_be32(inst
->skb
, NFULA_UID
, uid
) ||
561 nla_put_be32(inst
->skb
, NFULA_GID
, gid
))
562 goto nla_put_failure
;
564 read_unlock_bh(&sk
->sk_callback_lock
);
567 /* local sequence number */
568 if ((inst
->flags
& NFULNL_CFG_F_SEQ
) &&
569 nla_put_be32(inst
->skb
, NFULA_SEQ
, htonl(inst
->seq
++)))
570 goto nla_put_failure
;
572 /* global sequence number */
573 if ((inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
) &&
574 nla_put_be32(inst
->skb
, NFULA_SEQ_GLOBAL
,
575 htonl(atomic_inc_return(&log
->global_seq
))))
576 goto nla_put_failure
;
580 int size
= nla_attr_size(data_len
);
582 if (skb_tailroom(inst
->skb
) < nla_total_size(data_len
))
583 goto nla_put_failure
;
585 nla
= (struct nlattr
*)skb_put(inst
->skb
, nla_total_size(data_len
));
586 nla
->nla_type
= NFULA_PAYLOAD
;
589 if (skb_copy_bits(skb
, 0, nla_data(nla
), data_len
))
593 nlh
->nlmsg_len
= inst
->skb
->tail
- old_tail
;
597 PRINTR(KERN_ERR
"nfnetlink_log: error creating log nlmsg\n");
601 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
603 static struct nf_loginfo default_loginfo
= {
604 .type
= NF_LOG_TYPE_ULOG
,
614 /* log handler for internal netfilter logging api */
616 nfulnl_log_packet(struct net
*net
,
618 unsigned int hooknum
,
619 const struct sk_buff
*skb
,
620 const struct net_device
*in
,
621 const struct net_device
*out
,
622 const struct nf_loginfo
*li_user
,
625 unsigned int size
, data_len
;
626 struct nfulnl_instance
*inst
;
627 const struct nf_loginfo
*li
;
628 unsigned int qthreshold
;
630 struct nfnl_log_net
*log
= nfnl_log_pernet(net
);
632 if (li_user
&& li_user
->type
== NF_LOG_TYPE_ULOG
)
635 li
= &default_loginfo
;
637 inst
= instance_lookup_get(log
, li
->u
.ulog
.group
);
643 plen
= strlen(prefix
) + 1;
645 /* FIXME: do we want to make the size calculation conditional based on
646 * what is actually present? way more branches and checks, but more
647 * memory efficient... */
648 size
= nlmsg_total_size(sizeof(struct nfgenmsg
))
649 + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr
))
650 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
651 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
652 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
653 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
654 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
656 + nla_total_size(sizeof(u_int32_t
)) /* mark */
657 + nla_total_size(sizeof(u_int32_t
)) /* uid */
658 + nla_total_size(sizeof(u_int32_t
)) /* gid */
659 + nla_total_size(plen
) /* prefix */
660 + nla_total_size(sizeof(struct nfulnl_msg_packet_hw
))
661 + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp
))
662 + nla_total_size(sizeof(struct nfgenmsg
)); /* NLMSG_DONE */
664 if (in
&& skb_mac_header_was_set(skb
)) {
665 size
+= nla_total_size(skb
->dev
->hard_header_len
)
666 + nla_total_size(sizeof(u_int16_t
)) /* hwtype */
667 + nla_total_size(sizeof(u_int16_t
)); /* hwlen */
670 spin_lock_bh(&inst
->lock
);
672 if (inst
->flags
& NFULNL_CFG_F_SEQ
)
673 size
+= nla_total_size(sizeof(u_int32_t
));
674 if (inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
)
675 size
+= nla_total_size(sizeof(u_int32_t
));
677 qthreshold
= inst
->qthreshold
;
678 /* per-rule qthreshold overrides per-instance */
679 if (li
->u
.ulog
.qthreshold
)
680 if (qthreshold
> li
->u
.ulog
.qthreshold
)
681 qthreshold
= li
->u
.ulog
.qthreshold
;
684 switch (inst
->copy_mode
) {
685 case NFULNL_COPY_META
:
686 case NFULNL_COPY_NONE
:
690 case NFULNL_COPY_PACKET
:
691 if (inst
->copy_range
> skb
->len
)
694 data_len
= inst
->copy_range
;
696 size
+= nla_total_size(data_len
);
699 case NFULNL_COPY_DISABLED
:
701 goto unlock_and_release
;
704 if (inst
->skb
&& size
> skb_tailroom(inst
->skb
)) {
705 /* either the queue len is too high or we don't have
706 * enough room in the skb left. flush to userspace. */
707 __nfulnl_flush(inst
);
711 inst
->skb
= nfulnl_alloc_skb(net
, inst
->peer_portid
,
712 inst
->nlbufsiz
, size
);
719 __build_packet_message(log
, inst
, skb
, data_len
, pf
,
720 hooknum
, in
, out
, prefix
, plen
);
722 if (inst
->qlen
>= qthreshold
)
723 __nfulnl_flush(inst
);
724 /* timer_pending always called within inst->lock, so there
725 * is no chance of a race here */
726 else if (!timer_pending(&inst
->timer
)) {
728 inst
->timer
.expires
= jiffies
+ (inst
->flushtimeout
*HZ
/100);
729 add_timer(&inst
->timer
);
733 spin_unlock_bh(&inst
->lock
);
738 /* FIXME: statistics */
739 goto unlock_and_release
;
741 EXPORT_SYMBOL_GPL(nfulnl_log_packet
);
744 nfulnl_rcv_nl_event(struct notifier_block
*this,
745 unsigned long event
, void *ptr
)
747 struct netlink_notify
*n
= ptr
;
748 struct nfnl_log_net
*log
= nfnl_log_pernet(n
->net
);
750 if (event
== NETLINK_URELEASE
&& n
->protocol
== NETLINK_NETFILTER
) {
753 /* destroy all instances for this portid */
754 spin_lock_bh(&log
->instances_lock
);
755 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
756 struct hlist_node
*t2
;
757 struct nfulnl_instance
*inst
;
758 struct hlist_head
*head
= &log
->instance_table
[i
];
760 hlist_for_each_entry_safe(inst
, t2
, head
, hlist
) {
761 if (n
->portid
== inst
->peer_portid
)
762 __instance_destroy(inst
);
765 spin_unlock_bh(&log
->instances_lock
);
770 static struct notifier_block nfulnl_rtnl_notifier
= {
771 .notifier_call
= nfulnl_rcv_nl_event
,
775 nfulnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
776 const struct nlmsghdr
*nlh
,
777 const struct nlattr
* const nfqa
[])
782 static struct nf_logger nfulnl_logger __read_mostly
= {
783 .name
= "nfnetlink_log",
784 .type
= NF_LOG_TYPE_ULOG
,
785 .logfn
= &nfulnl_log_packet
,
789 static const struct nla_policy nfula_cfg_policy
[NFULA_CFG_MAX
+1] = {
790 [NFULA_CFG_CMD
] = { .len
= sizeof(struct nfulnl_msg_config_cmd
) },
791 [NFULA_CFG_MODE
] = { .len
= sizeof(struct nfulnl_msg_config_mode
) },
792 [NFULA_CFG_TIMEOUT
] = { .type
= NLA_U32
},
793 [NFULA_CFG_QTHRESH
] = { .type
= NLA_U32
},
794 [NFULA_CFG_NLBUFSIZ
] = { .type
= NLA_U32
},
795 [NFULA_CFG_FLAGS
] = { .type
= NLA_U16
},
799 nfulnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
800 const struct nlmsghdr
*nlh
,
801 const struct nlattr
* const nfula
[])
803 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
804 u_int16_t group_num
= ntohs(nfmsg
->res_id
);
805 struct nfulnl_instance
*inst
;
806 struct nfulnl_msg_config_cmd
*cmd
= NULL
;
807 struct net
*net
= sock_net(ctnl
);
808 struct nfnl_log_net
*log
= nfnl_log_pernet(net
);
811 if (nfula
[NFULA_CFG_CMD
]) {
812 u_int8_t pf
= nfmsg
->nfgen_family
;
813 cmd
= nla_data(nfula
[NFULA_CFG_CMD
]);
815 /* Commands without queue context */
816 switch (cmd
->command
) {
817 case NFULNL_CFG_CMD_PF_BIND
:
818 return nf_log_bind_pf(net
, pf
, &nfulnl_logger
);
819 case NFULNL_CFG_CMD_PF_UNBIND
:
820 nf_log_unbind_pf(net
, pf
);
825 inst
= instance_lookup_get(log
, group_num
);
826 if (inst
&& inst
->peer_portid
!= NETLINK_CB(skb
).portid
) {
832 switch (cmd
->command
) {
833 case NFULNL_CFG_CMD_BIND
:
839 inst
= instance_create(net
, group_num
,
840 NETLINK_CB(skb
).portid
,
841 sk_user_ns(NETLINK_CB(skb
).sk
));
847 case NFULNL_CFG_CMD_UNBIND
:
853 instance_destroy(log
, inst
);
861 if (nfula
[NFULA_CFG_MODE
]) {
862 struct nfulnl_msg_config_mode
*params
;
863 params
= nla_data(nfula
[NFULA_CFG_MODE
]);
869 nfulnl_set_mode(inst
, params
->copy_mode
,
870 ntohl(params
->copy_range
));
873 if (nfula
[NFULA_CFG_TIMEOUT
]) {
874 __be32 timeout
= nla_get_be32(nfula
[NFULA_CFG_TIMEOUT
]);
880 nfulnl_set_timeout(inst
, ntohl(timeout
));
883 if (nfula
[NFULA_CFG_NLBUFSIZ
]) {
884 __be32 nlbufsiz
= nla_get_be32(nfula
[NFULA_CFG_NLBUFSIZ
]);
890 nfulnl_set_nlbufsiz(inst
, ntohl(nlbufsiz
));
893 if (nfula
[NFULA_CFG_QTHRESH
]) {
894 __be32 qthresh
= nla_get_be32(nfula
[NFULA_CFG_QTHRESH
]);
900 nfulnl_set_qthresh(inst
, ntohl(qthresh
));
903 if (nfula
[NFULA_CFG_FLAGS
]) {
904 __be16 flags
= nla_get_be16(nfula
[NFULA_CFG_FLAGS
]);
910 nfulnl_set_flags(inst
, ntohs(flags
));
919 static const struct nfnl_callback nfulnl_cb
[NFULNL_MSG_MAX
] = {
920 [NFULNL_MSG_PACKET
] = { .call
= nfulnl_recv_unsupp
,
921 .attr_count
= NFULA_MAX
, },
922 [NFULNL_MSG_CONFIG
] = { .call
= nfulnl_recv_config
,
923 .attr_count
= NFULA_CFG_MAX
,
924 .policy
= nfula_cfg_policy
},
927 static const struct nfnetlink_subsystem nfulnl_subsys
= {
929 .subsys_id
= NFNL_SUBSYS_ULOG
,
930 .cb_count
= NFULNL_MSG_MAX
,
934 #ifdef CONFIG_PROC_FS
936 struct seq_net_private p
;
940 static struct hlist_node
*get_first(struct net
*net
, struct iter_state
*st
)
942 struct nfnl_log_net
*log
;
946 log
= nfnl_log_pernet(net
);
948 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
949 struct hlist_head
*head
= &log
->instance_table
[st
->bucket
];
951 if (!hlist_empty(head
))
952 return rcu_dereference_bh(hlist_first_rcu(head
));
957 static struct hlist_node
*get_next(struct net
*net
, struct iter_state
*st
,
958 struct hlist_node
*h
)
960 h
= rcu_dereference_bh(hlist_next_rcu(h
));
962 struct nfnl_log_net
*log
;
963 struct hlist_head
*head
;
965 if (++st
->bucket
>= INSTANCE_BUCKETS
)
968 log
= nfnl_log_pernet(net
);
969 head
= &log
->instance_table
[st
->bucket
];
970 h
= rcu_dereference_bh(hlist_first_rcu(head
));
975 static struct hlist_node
*get_idx(struct net
*net
, struct iter_state
*st
,
978 struct hlist_node
*head
;
979 head
= get_first(net
, st
);
982 while (pos
&& (head
= get_next(net
, st
, head
)))
984 return pos
? NULL
: head
;
987 static void *seq_start(struct seq_file
*s
, loff_t
*pos
)
991 return get_idx(seq_file_net(s
), s
->private, *pos
);
994 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
997 return get_next(seq_file_net(s
), s
->private, v
);
1000 static void seq_stop(struct seq_file
*s
, void *v
)
1003 rcu_read_unlock_bh();
1006 static int seq_show(struct seq_file
*s
, void *v
)
1008 const struct nfulnl_instance
*inst
= v
;
1010 seq_printf(s
, "%5u %6u %5u %1u %5u %6u %2u\n",
1012 inst
->peer_portid
, inst
->qlen
,
1013 inst
->copy_mode
, inst
->copy_range
,
1014 inst
->flushtimeout
, atomic_read(&inst
->use
));
1019 static const struct seq_operations nful_seq_ops
= {
1026 static int nful_open(struct inode
*inode
, struct file
*file
)
1028 return seq_open_net(inode
, file
, &nful_seq_ops
,
1029 sizeof(struct iter_state
));
1032 static const struct file_operations nful_file_ops
= {
1033 .owner
= THIS_MODULE
,
1036 .llseek
= seq_lseek
,
1037 .release
= seq_release_net
,
1040 #endif /* PROC_FS */
1042 static int __net_init
nfnl_log_net_init(struct net
*net
)
1045 struct nfnl_log_net
*log
= nfnl_log_pernet(net
);
1047 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
1048 INIT_HLIST_HEAD(&log
->instance_table
[i
]);
1049 spin_lock_init(&log
->instances_lock
);
1051 #ifdef CONFIG_PROC_FS
1052 if (!proc_create("nfnetlink_log", 0440,
1053 net
->nf
.proc_netfilter
, &nful_file_ops
))
1059 static void __net_exit
nfnl_log_net_exit(struct net
*net
)
1061 #ifdef CONFIG_PROC_FS
1062 remove_proc_entry("nfnetlink_log", net
->nf
.proc_netfilter
);
1064 nf_log_unset(net
, &nfulnl_logger
);
1067 static struct pernet_operations nfnl_log_net_ops
= {
1068 .init
= nfnl_log_net_init
,
1069 .exit
= nfnl_log_net_exit
,
1070 .id
= &nfnl_log_net_id
,
1071 .size
= sizeof(struct nfnl_log_net
),
1074 static int __init
nfnetlink_log_init(void)
1078 status
= register_pernet_subsys(&nfnl_log_net_ops
);
1080 pr_err("failed to register pernet ops\n");
1084 netlink_register_notifier(&nfulnl_rtnl_notifier
);
1085 status
= nfnetlink_subsys_register(&nfulnl_subsys
);
1087 pr_err("failed to create netlink socket\n");
1088 goto cleanup_netlink_notifier
;
1091 status
= nf_log_register(NFPROTO_UNSPEC
, &nfulnl_logger
);
1093 pr_err("failed to register logger\n");
1094 goto cleanup_subsys
;
1100 nfnetlink_subsys_unregister(&nfulnl_subsys
);
1101 cleanup_netlink_notifier
:
1102 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
1103 unregister_pernet_subsys(&nfnl_log_net_ops
);
1108 static void __exit
nfnetlink_log_fini(void)
1110 nf_log_unregister(&nfulnl_logger
);
1111 nfnetlink_subsys_unregister(&nfulnl_subsys
);
1112 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
1113 unregister_pernet_subsys(&nfnl_log_net_ops
);
1116 MODULE_DESCRIPTION("netfilter userspace logging");
1117 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1118 MODULE_LICENSE("GPL");
1119 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG
);
1120 MODULE_ALIAS_NF_LOGGER(AF_INET
, 1);
1121 MODULE_ALIAS_NF_LOGGER(AF_INET6
, 1);
1122 MODULE_ALIAS_NF_LOGGER(AF_BRIDGE
, 1);
1124 module_init(nfnetlink_log_init
);
1125 module_exit(nfnetlink_log_fini
);