2 * This is a module which is used for logging packets to userspace via
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
7 * Based on the old ipv4-only ipt_ULOG.c:
8 * (C) 2000-2004 by Harald Welte <laforge@netfilter.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
14 #include <linux/module.h>
15 #include <linux/skbuff.h>
16 #include <linux/init.h>
18 #include <linux/ipv6.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter.h>
21 #include <linux/netlink.h>
22 #include <linux/netfilter/nfnetlink.h>
23 #include <linux/netfilter/nfnetlink_log.h>
24 #include <linux/spinlock.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/list.h>
29 #include <linux/jhash.h>
30 #include <linux/random.h>
32 #include <net/netfilter/nf_log.h>
34 #include <asm/atomic.h>
36 #ifdef CONFIG_BRIDGE_NETFILTER
37 #include "../bridge/br_private.h"
40 #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
41 #define NFULNL_TIMEOUT_DEFAULT HZ /* every second */
42 #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
43 #define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */
45 #define PRINTR(x, args...) do { if (net_ratelimit()) \
46 printk(x, ## args); } while (0);
48 struct nfulnl_instance
{
49 struct hlist_node hlist
; /* global list of instances */
51 atomic_t use
; /* use count */
53 unsigned int qlen
; /* number of nlmsgs in skb */
54 struct sk_buff
*skb
; /* pre-allocatd skb */
55 struct timer_list timer
;
56 int peer_pid
; /* PID of the peer process */
58 /* configurable parameters */
59 unsigned int flushtimeout
; /* timeout until queue flush */
60 unsigned int nlbufsiz
; /* netlink buffer allocation size */
61 unsigned int qthreshold
; /* threshold of the queue */
63 u_int32_t seq
; /* instance-local sequential counter */
64 u_int16_t group_num
; /* number of this queue */
69 static DEFINE_RWLOCK(instances_lock
);
70 static atomic_t global_seq
;
72 #define INSTANCE_BUCKETS 16
73 static struct hlist_head instance_table
[INSTANCE_BUCKETS
];
74 static unsigned int hash_init
;
76 static inline u_int8_t
instance_hashfn(u_int16_t group_num
)
78 return ((group_num
& 0xff) % INSTANCE_BUCKETS
);
81 static struct nfulnl_instance
*
82 __instance_lookup(u_int16_t group_num
)
84 struct hlist_head
*head
;
85 struct hlist_node
*pos
;
86 struct nfulnl_instance
*inst
;
88 head
= &instance_table
[instance_hashfn(group_num
)];
89 hlist_for_each_entry(inst
, pos
, head
, hlist
) {
90 if (inst
->group_num
== group_num
)
97 instance_get(struct nfulnl_instance
*inst
)
99 atomic_inc(&inst
->use
);
102 static struct nfulnl_instance
*
103 instance_lookup_get(u_int16_t group_num
)
105 struct nfulnl_instance
*inst
;
107 read_lock_bh(&instances_lock
);
108 inst
= __instance_lookup(group_num
);
111 read_unlock_bh(&instances_lock
);
117 instance_put(struct nfulnl_instance
*inst
)
119 if (inst
&& atomic_dec_and_test(&inst
->use
)) {
121 module_put(THIS_MODULE
);
125 static void nfulnl_timer(unsigned long data
);
127 static struct nfulnl_instance
*
128 instance_create(u_int16_t group_num
, int pid
)
130 struct nfulnl_instance
*inst
;
133 write_lock_bh(&instances_lock
);
134 if (__instance_lookup(group_num
)) {
139 inst
= kzalloc(sizeof(*inst
), GFP_ATOMIC
);
145 if (!try_module_get(THIS_MODULE
)) {
151 INIT_HLIST_NODE(&inst
->hlist
);
152 spin_lock_init(&inst
->lock
);
153 /* needs to be two, since we _put() after creation */
154 atomic_set(&inst
->use
, 2);
156 setup_timer(&inst
->timer
, nfulnl_timer
, (unsigned long)inst
);
158 inst
->peer_pid
= pid
;
159 inst
->group_num
= group_num
;
161 inst
->qthreshold
= NFULNL_QTHRESH_DEFAULT
;
162 inst
->flushtimeout
= NFULNL_TIMEOUT_DEFAULT
;
163 inst
->nlbufsiz
= NFULNL_NLBUFSIZ_DEFAULT
;
164 inst
->copy_mode
= NFULNL_COPY_PACKET
;
165 inst
->copy_range
= NFULNL_COPY_RANGE_MAX
;
167 hlist_add_head(&inst
->hlist
,
168 &instance_table
[instance_hashfn(group_num
)]);
170 write_unlock_bh(&instances_lock
);
175 write_unlock_bh(&instances_lock
);
179 static void __nfulnl_flush(struct nfulnl_instance
*inst
);
182 __instance_destroy(struct nfulnl_instance
*inst
)
184 /* first pull it out of the global list */
185 hlist_del(&inst
->hlist
);
187 /* then flush all pending packets from skb */
189 spin_lock_bh(&inst
->lock
);
191 __nfulnl_flush(inst
);
192 spin_unlock_bh(&inst
->lock
);
194 /* and finally put the refcount */
199 instance_destroy(struct nfulnl_instance
*inst
)
201 write_lock_bh(&instances_lock
);
202 __instance_destroy(inst
);
203 write_unlock_bh(&instances_lock
);
207 nfulnl_set_mode(struct nfulnl_instance
*inst
, u_int8_t mode
,
212 spin_lock_bh(&inst
->lock
);
215 case NFULNL_COPY_NONE
:
216 case NFULNL_COPY_META
:
217 inst
->copy_mode
= mode
;
218 inst
->copy_range
= 0;
221 case NFULNL_COPY_PACKET
:
222 inst
->copy_mode
= mode
;
223 inst
->copy_range
= min_t(unsigned int,
224 range
, NFULNL_COPY_RANGE_MAX
);
232 spin_unlock_bh(&inst
->lock
);
238 nfulnl_set_nlbufsiz(struct nfulnl_instance
*inst
, u_int32_t nlbufsiz
)
242 spin_lock_bh(&inst
->lock
);
243 if (nlbufsiz
< NFULNL_NLBUFSIZ_DEFAULT
)
245 else if (nlbufsiz
> 131072)
248 inst
->nlbufsiz
= nlbufsiz
;
251 spin_unlock_bh(&inst
->lock
);
257 nfulnl_set_timeout(struct nfulnl_instance
*inst
, u_int32_t timeout
)
259 spin_lock_bh(&inst
->lock
);
260 inst
->flushtimeout
= timeout
;
261 spin_unlock_bh(&inst
->lock
);
267 nfulnl_set_qthresh(struct nfulnl_instance
*inst
, u_int32_t qthresh
)
269 spin_lock_bh(&inst
->lock
);
270 inst
->qthreshold
= qthresh
;
271 spin_unlock_bh(&inst
->lock
);
277 nfulnl_set_flags(struct nfulnl_instance
*inst
, u_int16_t flags
)
279 spin_lock_bh(&inst
->lock
);
281 spin_unlock_bh(&inst
->lock
);
286 static struct sk_buff
*
287 nfulnl_alloc_skb(unsigned int inst_size
, unsigned int pkt_size
)
292 /* alloc skb which should be big enough for a whole multipart
293 * message. WARNING: has to be <= 128k due to slab restrictions */
295 n
= max(inst_size
, pkt_size
);
296 skb
= alloc_skb(n
, GFP_ATOMIC
);
298 PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n",
302 /* try to allocate only as much as we need for current
305 skb
= alloc_skb(pkt_size
, GFP_ATOMIC
);
307 PRINTR("nfnetlink_log: can't even alloc %u "
308 "bytes\n", pkt_size
);
316 __nfulnl_send(struct nfulnl_instance
*inst
)
321 NLMSG_PUT(inst
->skb
, 0, 0,
323 sizeof(struct nfgenmsg
));
325 status
= nfnetlink_unicast(inst
->skb
, inst
->peer_pid
, MSG_DONTWAIT
);
335 __nfulnl_flush(struct nfulnl_instance
*inst
)
337 /* timer holds a reference */
338 if (del_timer(&inst
->timer
))
345 nfulnl_timer(unsigned long data
)
347 struct nfulnl_instance
*inst
= (struct nfulnl_instance
*)data
;
349 spin_lock_bh(&inst
->lock
);
352 spin_unlock_bh(&inst
->lock
);
356 /* This is an inline function, we don't really care about a long
357 * list of arguments */
359 __build_packet_message(struct nfulnl_instance
*inst
,
360 const struct sk_buff
*skb
,
361 unsigned int data_len
,
363 unsigned int hooknum
,
364 const struct net_device
*indev
,
365 const struct net_device
*outdev
,
366 const struct nf_loginfo
*li
,
367 const char *prefix
, unsigned int plen
)
369 struct nfulnl_msg_packet_hdr pmsg
;
370 struct nlmsghdr
*nlh
;
371 struct nfgenmsg
*nfmsg
;
373 sk_buff_data_t old_tail
= inst
->skb
->tail
;
375 nlh
= NLMSG_PUT(inst
->skb
, 0, 0,
376 NFNL_SUBSYS_ULOG
<< 8 | NFULNL_MSG_PACKET
,
377 sizeof(struct nfgenmsg
));
378 nfmsg
= NLMSG_DATA(nlh
);
379 nfmsg
->nfgen_family
= pf
;
380 nfmsg
->version
= NFNETLINK_V0
;
381 nfmsg
->res_id
= htons(inst
->group_num
);
383 pmsg
.hw_protocol
= skb
->protocol
;
386 NLA_PUT(inst
->skb
, NFULA_PACKET_HDR
, sizeof(pmsg
), &pmsg
);
389 NLA_PUT(inst
->skb
, NFULA_PREFIX
, plen
, prefix
);
392 #ifndef CONFIG_BRIDGE_NETFILTER
393 NLA_PUT_BE32(inst
->skb
, NFULA_IFINDEX_INDEV
,
394 htonl(indev
->ifindex
));
396 if (pf
== PF_BRIDGE
) {
397 /* Case 1: outdev is physical input device, we need to
398 * look for bridge group (when called from
399 * netfilter_bridge) */
400 NLA_PUT_BE32(inst
->skb
, NFULA_IFINDEX_PHYSINDEV
,
401 htonl(indev
->ifindex
));
402 /* this is the bridge group "brX" */
403 NLA_PUT_BE32(inst
->skb
, NFULA_IFINDEX_INDEV
,
404 htonl(indev
->br_port
->br
->dev
->ifindex
));
406 /* Case 2: indev is bridge group, we need to look for
407 * physical device (when called from ipv4) */
408 NLA_PUT_BE32(inst
->skb
, NFULA_IFINDEX_INDEV
,
409 htonl(indev
->ifindex
));
410 if (skb
->nf_bridge
&& skb
->nf_bridge
->physindev
)
411 NLA_PUT_BE32(inst
->skb
, NFULA_IFINDEX_PHYSINDEV
,
412 htonl(skb
->nf_bridge
->physindev
->ifindex
));
418 tmp_uint
= htonl(outdev
->ifindex
);
419 #ifndef CONFIG_BRIDGE_NETFILTER
420 NLA_PUT_BE32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
421 htonl(outdev
->ifindex
));
423 if (pf
== PF_BRIDGE
) {
424 /* Case 1: outdev is physical output device, we need to
425 * look for bridge group (when called from
426 * netfilter_bridge) */
427 NLA_PUT_BE32(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
428 htonl(outdev
->ifindex
));
429 /* this is the bridge group "brX" */
430 NLA_PUT_BE32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
431 htonl(outdev
->br_port
->br
->dev
->ifindex
));
433 /* Case 2: indev is a bridge group, we need to look
434 * for physical device (when called from ipv4) */
435 NLA_PUT_BE32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
436 htonl(outdev
->ifindex
));
437 if (skb
->nf_bridge
&& skb
->nf_bridge
->physoutdev
)
438 NLA_PUT_BE32(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
439 htonl(skb
->nf_bridge
->physoutdev
->ifindex
));
445 NLA_PUT_BE32(inst
->skb
, NFULA_MARK
, htonl(skb
->mark
));
447 if (indev
&& skb
->dev
) {
448 struct nfulnl_msg_packet_hw phw
;
449 int len
= dev_parse_header(skb
, phw
.hw_addr
);
451 phw
.hw_addrlen
= htons(len
);
452 NLA_PUT(inst
->skb
, NFULA_HWADDR
, sizeof(phw
), &phw
);
456 if (skb
->tstamp
.tv64
) {
457 struct nfulnl_msg_packet_timestamp ts
;
458 struct timeval tv
= ktime_to_timeval(skb
->tstamp
);
459 ts
.sec
= cpu_to_be64(tv
.tv_sec
);
460 ts
.usec
= cpu_to_be64(tv
.tv_usec
);
462 NLA_PUT(inst
->skb
, NFULA_TIMESTAMP
, sizeof(ts
), &ts
);
467 read_lock_bh(&skb
->sk
->sk_callback_lock
);
468 if (skb
->sk
->sk_socket
&& skb
->sk
->sk_socket
->file
) {
469 __be32 uid
= htonl(skb
->sk
->sk_socket
->file
->f_uid
);
470 /* need to unlock here since NLA_PUT may goto */
471 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
472 NLA_PUT_BE32(inst
->skb
, NFULA_UID
, uid
);
474 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
477 /* local sequence number */
478 if (inst
->flags
& NFULNL_CFG_F_SEQ
)
479 NLA_PUT_BE32(inst
->skb
, NFULA_SEQ
, htonl(inst
->seq
++));
481 /* global sequence number */
482 if (inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
)
483 NLA_PUT_BE32(inst
->skb
, NFULA_SEQ_GLOBAL
,
484 htonl(atomic_inc_return(&global_seq
)));
488 int size
= nla_attr_size(data_len
);
490 if (skb_tailroom(inst
->skb
) < nla_total_size(data_len
)) {
491 printk(KERN_WARNING
"nfnetlink_log: no tailroom!\n");
495 nla
= (struct nlattr
*)skb_put(inst
->skb
, nla_total_size(data_len
));
496 nla
->nla_type
= NFULA_PAYLOAD
;
499 if (skb_copy_bits(skb
, 0, nla_data(nla
), data_len
))
503 nlh
->nlmsg_len
= inst
->skb
->tail
- old_tail
;
508 PRINTR(KERN_ERR
"nfnetlink_log: error creating log nlmsg\n");
512 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
514 static struct nf_loginfo default_loginfo
= {
515 .type
= NF_LOG_TYPE_ULOG
,
525 /* log handler for internal netfilter logging api */
527 nfulnl_log_packet(unsigned int pf
,
528 unsigned int hooknum
,
529 const struct sk_buff
*skb
,
530 const struct net_device
*in
,
531 const struct net_device
*out
,
532 const struct nf_loginfo
*li_user
,
535 unsigned int size
, data_len
;
536 struct nfulnl_instance
*inst
;
537 const struct nf_loginfo
*li
;
538 unsigned int qthreshold
;
541 if (li_user
&& li_user
->type
== NF_LOG_TYPE_ULOG
)
544 li
= &default_loginfo
;
546 inst
= instance_lookup_get(li
->u
.ulog
.group
);
552 plen
= strlen(prefix
) + 1;
554 /* FIXME: do we want to make the size calculation conditional based on
555 * what is actually present? way more branches and checks, but more
556 * memory efficient... */
557 size
= NLMSG_ALIGN(sizeof(struct nfgenmsg
))
558 + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr
))
559 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
560 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
561 #ifdef CONFIG_BRIDGE_NETFILTER
562 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
563 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
565 + nla_total_size(sizeof(u_int32_t
)) /* mark */
566 + nla_total_size(sizeof(u_int32_t
)) /* uid */
567 + nla_total_size(plen
) /* prefix */
568 + nla_total_size(sizeof(struct nfulnl_msg_packet_hw
))
569 + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp
));
571 spin_lock_bh(&inst
->lock
);
573 if (inst
->flags
& NFULNL_CFG_F_SEQ
)
574 size
+= nla_total_size(sizeof(u_int32_t
));
575 if (inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
)
576 size
+= nla_total_size(sizeof(u_int32_t
));
578 qthreshold
= inst
->qthreshold
;
579 /* per-rule qthreshold overrides per-instance */
580 if (qthreshold
> li
->u
.ulog
.qthreshold
)
581 qthreshold
= li
->u
.ulog
.qthreshold
;
583 switch (inst
->copy_mode
) {
584 case NFULNL_COPY_META
:
585 case NFULNL_COPY_NONE
:
589 case NFULNL_COPY_PACKET
:
590 if (inst
->copy_range
== 0
591 || inst
->copy_range
> skb
->len
)
594 data_len
= inst
->copy_range
;
596 size
+= nla_total_size(data_len
);
600 goto unlock_and_release
;
604 size
> skb_tailroom(inst
->skb
) - sizeof(struct nfgenmsg
)) {
605 /* either the queue len is too high or we don't have
606 * enough room in the skb left. flush to userspace. */
607 __nfulnl_flush(inst
);
611 inst
->skb
= nfulnl_alloc_skb(inst
->nlbufsiz
, size
);
618 __build_packet_message(inst
, skb
, data_len
, pf
,
619 hooknum
, in
, out
, li
, prefix
, plen
);
621 if (inst
->qlen
>= qthreshold
)
622 __nfulnl_flush(inst
);
623 /* timer_pending always called within inst->lock, so there
624 * is no chance of a race here */
625 else if (!timer_pending(&inst
->timer
)) {
627 inst
->timer
.expires
= jiffies
+ (inst
->flushtimeout
*HZ
/100);
628 add_timer(&inst
->timer
);
632 spin_unlock_bh(&inst
->lock
);
637 /* FIXME: statistics */
638 goto unlock_and_release
;
642 nfulnl_rcv_nl_event(struct notifier_block
*this,
643 unsigned long event
, void *ptr
)
645 struct netlink_notify
*n
= ptr
;
647 if (event
== NETLINK_URELEASE
&&
648 n
->protocol
== NETLINK_NETFILTER
&& n
->pid
) {
651 /* destroy all instances for this pid */
652 write_lock_bh(&instances_lock
);
653 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
654 struct hlist_node
*tmp
, *t2
;
655 struct nfulnl_instance
*inst
;
656 struct hlist_head
*head
= &instance_table
[i
];
658 hlist_for_each_entry_safe(inst
, tmp
, t2
, head
, hlist
) {
659 if ((n
->net
== &init_net
) &&
660 (n
->pid
== inst
->peer_pid
))
661 __instance_destroy(inst
);
664 write_unlock_bh(&instances_lock
);
669 static struct notifier_block nfulnl_rtnl_notifier
= {
670 .notifier_call
= nfulnl_rcv_nl_event
,
674 nfulnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
675 struct nlmsghdr
*nlh
, struct nlattr
*nfqa
[])
680 static const struct nf_logger nfulnl_logger
= {
681 .name
= "nfnetlink_log",
682 .logfn
= &nfulnl_log_packet
,
686 static const struct nla_policy nfula_cfg_policy
[NFULA_CFG_MAX
+1] = {
687 [NFULA_CFG_CMD
] = { .len
= sizeof(struct nfulnl_msg_config_cmd
) },
688 [NFULA_CFG_MODE
] = { .len
= sizeof(struct nfulnl_msg_config_mode
) },
689 [NFULA_CFG_TIMEOUT
] = { .type
= NLA_U32
},
690 [NFULA_CFG_QTHRESH
] = { .type
= NLA_U32
},
691 [NFULA_CFG_NLBUFSIZ
] = { .type
= NLA_U32
},
692 [NFULA_CFG_FLAGS
] = { .type
= NLA_U16
},
696 nfulnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
697 struct nlmsghdr
*nlh
, struct nlattr
*nfula
[])
699 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
700 u_int16_t group_num
= ntohs(nfmsg
->res_id
);
701 struct nfulnl_instance
*inst
;
704 inst
= instance_lookup_get(group_num
);
705 if (inst
&& inst
->peer_pid
!= NETLINK_CB(skb
).pid
) {
710 if (nfula
[NFULA_CFG_CMD
]) {
711 u_int8_t pf
= nfmsg
->nfgen_family
;
712 struct nfulnl_msg_config_cmd
*cmd
;
714 cmd
= nla_data(nfula
[NFULA_CFG_CMD
]);
716 switch (cmd
->command
) {
717 case NFULNL_CFG_CMD_BIND
:
723 inst
= instance_create(group_num
,
724 NETLINK_CB(skb
).pid
);
730 case NFULNL_CFG_CMD_UNBIND
:
736 instance_destroy(inst
);
738 case NFULNL_CFG_CMD_PF_BIND
:
739 ret
= nf_log_register(pf
, &nfulnl_logger
);
741 case NFULNL_CFG_CMD_PF_UNBIND
:
742 /* This is a bug and a feature. We cannot unregister
743 * other handlers, like nfnetlink_inst can */
744 nf_log_unregister_pf(pf
);
752 if (nfula
[NFULA_CFG_MODE
]) {
753 struct nfulnl_msg_config_mode
*params
;
754 params
= nla_data(nfula
[NFULA_CFG_MODE
]);
760 nfulnl_set_mode(inst
, params
->copy_mode
,
761 ntohl(params
->copy_range
));
764 if (nfula
[NFULA_CFG_TIMEOUT
]) {
765 __be32 timeout
= nla_get_be32(nfula
[NFULA_CFG_TIMEOUT
]);
771 nfulnl_set_timeout(inst
, ntohl(timeout
));
774 if (nfula
[NFULA_CFG_NLBUFSIZ
]) {
775 __be32 nlbufsiz
= nla_get_be32(nfula
[NFULA_CFG_NLBUFSIZ
]);
781 nfulnl_set_nlbufsiz(inst
, ntohl(nlbufsiz
));
784 if (nfula
[NFULA_CFG_QTHRESH
]) {
785 __be32 qthresh
= nla_get_be32(nfula
[NFULA_CFG_QTHRESH
]);
791 nfulnl_set_qthresh(inst
, ntohl(qthresh
));
794 if (nfula
[NFULA_CFG_FLAGS
]) {
795 __be16 flags
= nla_get_be16(nfula
[NFULA_CFG_FLAGS
]);
801 nfulnl_set_flags(inst
, ntohs(flags
));
810 static const struct nfnl_callback nfulnl_cb
[NFULNL_MSG_MAX
] = {
811 [NFULNL_MSG_PACKET
] = { .call
= nfulnl_recv_unsupp
,
812 .attr_count
= NFULA_MAX
, },
813 [NFULNL_MSG_CONFIG
] = { .call
= nfulnl_recv_config
,
814 .attr_count
= NFULA_CFG_MAX
,
815 .policy
= nfula_cfg_policy
},
818 static const struct nfnetlink_subsystem nfulnl_subsys
= {
820 .subsys_id
= NFNL_SUBSYS_ULOG
,
821 .cb_count
= NFULNL_MSG_MAX
,
825 #ifdef CONFIG_PROC_FS
830 static struct hlist_node
*get_first(struct iter_state
*st
)
835 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
836 if (!hlist_empty(&instance_table
[st
->bucket
]))
837 return instance_table
[st
->bucket
].first
;
842 static struct hlist_node
*get_next(struct iter_state
*st
, struct hlist_node
*h
)
846 if (++st
->bucket
>= INSTANCE_BUCKETS
)
849 h
= instance_table
[st
->bucket
].first
;
854 static struct hlist_node
*get_idx(struct iter_state
*st
, loff_t pos
)
856 struct hlist_node
*head
;
857 head
= get_first(st
);
860 while (pos
&& (head
= get_next(st
, head
)))
862 return pos
? NULL
: head
;
865 static void *seq_start(struct seq_file
*seq
, loff_t
*pos
)
867 read_lock_bh(&instances_lock
);
868 return get_idx(seq
->private, *pos
);
871 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
874 return get_next(s
->private, v
);
877 static void seq_stop(struct seq_file
*s
, void *v
)
879 read_unlock_bh(&instances_lock
);
882 static int seq_show(struct seq_file
*s
, void *v
)
884 const struct nfulnl_instance
*inst
= v
;
886 return seq_printf(s
, "%5d %6d %5d %1d %5d %6d %2d\n",
888 inst
->peer_pid
, inst
->qlen
,
889 inst
->copy_mode
, inst
->copy_range
,
890 inst
->flushtimeout
, atomic_read(&inst
->use
));
893 static const struct seq_operations nful_seq_ops
= {
900 static int nful_open(struct inode
*inode
, struct file
*file
)
902 return seq_open_private(file
, &nful_seq_ops
,
903 sizeof(struct iter_state
));
906 static const struct file_operations nful_file_ops
= {
907 .owner
= THIS_MODULE
,
911 .release
= seq_release_private
,
916 static int __init
nfnetlink_log_init(void)
918 int i
, status
= -ENOMEM
;
919 #ifdef CONFIG_PROC_FS
920 struct proc_dir_entry
*proc_nful
;
923 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
924 INIT_HLIST_HEAD(&instance_table
[i
]);
926 /* it's not really all that important to have a random value, so
927 * we can do this from the init function, even if there hasn't
928 * been that much entropy yet */
929 get_random_bytes(&hash_init
, sizeof(hash_init
));
931 netlink_register_notifier(&nfulnl_rtnl_notifier
);
932 status
= nfnetlink_subsys_register(&nfulnl_subsys
);
934 printk(KERN_ERR
"log: failed to create netlink socket\n");
935 goto cleanup_netlink_notifier
;
938 #ifdef CONFIG_PROC_FS
939 proc_nful
= create_proc_entry("nfnetlink_log", 0440,
943 proc_nful
->proc_fops
= &nful_file_ops
;
947 #ifdef CONFIG_PROC_FS
949 nfnetlink_subsys_unregister(&nfulnl_subsys
);
951 cleanup_netlink_notifier
:
952 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
956 static void __exit
nfnetlink_log_fini(void)
958 nf_log_unregister(&nfulnl_logger
);
959 #ifdef CONFIG_PROC_FS
960 remove_proc_entry("nfnetlink_log", proc_net_netfilter
);
962 nfnetlink_subsys_unregister(&nfulnl_subsys
);
963 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
966 MODULE_DESCRIPTION("netfilter userspace logging");
967 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
968 MODULE_LICENSE("GPL");
969 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG
);
971 module_init(nfnetlink_log_init
);
972 module_exit(nfnetlink_log_fini
);