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 * 2006-01-26 Harald Welte <laforge@netfilter.org>
15 * - Add optional local and global sequence number to detect lost
16 * events from userspace
19 #include <linux/module.h>
20 #include <linux/skbuff.h>
21 #include <linux/init.h>
23 #include <linux/ipv6.h>
24 #include <linux/netdevice.h>
25 #include <linux/netfilter.h>
26 #include <linux/netlink.h>
27 #include <linux/netfilter/nfnetlink.h>
28 #include <linux/netfilter/nfnetlink_log.h>
29 #include <linux/spinlock.h>
30 #include <linux/sysctl.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/list.h>
34 #include <linux/jhash.h>
35 #include <linux/random.h>
38 #include <asm/atomic.h>
40 #ifdef CONFIG_BRIDGE_NETFILTER
41 #include "../bridge/br_private.h"
44 #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
45 #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
46 #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
48 #define PRINTR(x, args...) do { if (net_ratelimit()) \
49 printk(x, ## args); } while (0);
52 #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \
53 __FILE__, __LINE__, __FUNCTION__, \
56 #define UDEBUG(x, ...)
59 struct nfulnl_instance
{
60 struct hlist_node hlist
; /* global list of instances */
62 atomic_t use
; /* use count */
64 unsigned int qlen
; /* number of nlmsgs in skb */
65 struct sk_buff
*skb
; /* pre-allocatd skb */
66 struct nlmsghdr
*lastnlh
; /* netlink header of last msg in skb */
67 struct timer_list timer
;
68 int peer_pid
; /* PID of the peer process */
70 /* configurable parameters */
71 unsigned int flushtimeout
; /* timeout until queue flush */
72 unsigned int nlbufsiz
; /* netlink buffer allocation size */
73 unsigned int qthreshold
; /* threshold of the queue */
75 u_int32_t seq
; /* instance-local sequential counter */
76 u_int16_t group_num
; /* number of this queue */
81 static DEFINE_RWLOCK(instances_lock
);
82 static atomic_t global_seq
;
84 #define INSTANCE_BUCKETS 16
85 static struct hlist_head instance_table
[INSTANCE_BUCKETS
];
86 static unsigned int hash_init
;
88 static inline u_int8_t
instance_hashfn(u_int16_t group_num
)
90 return ((group_num
& 0xff) % INSTANCE_BUCKETS
);
93 static struct nfulnl_instance
*
94 __instance_lookup(u_int16_t group_num
)
96 struct hlist_head
*head
;
97 struct hlist_node
*pos
;
98 struct nfulnl_instance
*inst
;
100 UDEBUG("entering (group_num=%u)\n", group_num
);
102 head
= &instance_table
[instance_hashfn(group_num
)];
103 hlist_for_each_entry(inst
, pos
, 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(u_int16_t group_num
)
119 struct nfulnl_instance
*inst
;
121 read_lock_bh(&instances_lock
);
122 inst
= __instance_lookup(group_num
);
125 read_unlock_bh(&instances_lock
);
131 instance_put(struct nfulnl_instance
*inst
)
133 if (inst
&& atomic_dec_and_test(&inst
->use
)) {
134 UDEBUG("kfree(inst=%p)\n", inst
);
136 module_put(THIS_MODULE
);
140 static void nfulnl_timer(unsigned long data
);
142 static struct nfulnl_instance
*
143 instance_create(u_int16_t group_num
, int pid
)
145 struct nfulnl_instance
*inst
;
147 UDEBUG("entering (group_num=%u, pid=%d)\n", group_num
,
150 write_lock_bh(&instances_lock
);
151 if (__instance_lookup(group_num
)) {
153 UDEBUG("aborting, instance already exists\n");
157 inst
= kzalloc(sizeof(*inst
), GFP_ATOMIC
);
161 INIT_HLIST_NODE(&inst
->hlist
);
162 spin_lock_init(&inst
->lock
);
163 /* needs to be two, since we _put() after creation */
164 atomic_set(&inst
->use
, 2);
166 init_timer(&inst
->timer
);
167 inst
->timer
.function
= nfulnl_timer
;
168 inst
->timer
.data
= (unsigned long)inst
;
169 /* don't start timer yet. (re)start it with every packet */
171 inst
->peer_pid
= pid
;
172 inst
->group_num
= group_num
;
174 inst
->qthreshold
= NFULNL_QTHRESH_DEFAULT
;
175 inst
->flushtimeout
= NFULNL_TIMEOUT_DEFAULT
;
176 inst
->nlbufsiz
= NFULNL_NLBUFSIZ_DEFAULT
;
177 inst
->copy_mode
= NFULNL_COPY_PACKET
;
178 inst
->copy_range
= 0xffff;
180 if (!try_module_get(THIS_MODULE
))
183 hlist_add_head(&inst
->hlist
,
184 &instance_table
[instance_hashfn(group_num
)]);
186 UDEBUG("newly added node: %p, next=%p\n", &inst
->hlist
,
189 write_unlock_bh(&instances_lock
);
196 write_unlock_bh(&instances_lock
);
200 static int __nfulnl_send(struct nfulnl_instance
*inst
);
203 _instance_destroy2(struct nfulnl_instance
*inst
, int lock
)
205 /* first pull it out of the global list */
207 write_lock_bh(&instances_lock
);
209 UDEBUG("removing instance %p (queuenum=%u) from hash\n",
210 inst
, inst
->group_num
);
212 hlist_del(&inst
->hlist
);
215 write_unlock_bh(&instances_lock
);
217 /* then flush all pending packets from skb */
219 spin_lock_bh(&inst
->lock
);
221 /* timer "holds" one reference (we have one more) */
222 if (del_timer(&inst
->timer
))
227 kfree_skb(inst
->skb
);
231 spin_unlock_bh(&inst
->lock
);
233 /* and finally put the refcount */
238 __instance_destroy(struct nfulnl_instance
*inst
)
240 _instance_destroy2(inst
, 0);
244 instance_destroy(struct nfulnl_instance
*inst
)
246 _instance_destroy2(inst
, 1);
250 nfulnl_set_mode(struct nfulnl_instance
*inst
, u_int8_t mode
,
255 spin_lock_bh(&inst
->lock
);
258 case NFULNL_COPY_NONE
:
259 case NFULNL_COPY_META
:
260 inst
->copy_mode
= mode
;
261 inst
->copy_range
= 0;
264 case NFULNL_COPY_PACKET
:
265 inst
->copy_mode
= mode
;
266 /* we're using struct nfattr which has 16bit nfa_len */
268 inst
->copy_range
= 0xffff;
270 inst
->copy_range
= range
;
278 spin_unlock_bh(&inst
->lock
);
284 nfulnl_set_nlbufsiz(struct nfulnl_instance
*inst
, u_int32_t nlbufsiz
)
288 spin_lock_bh(&inst
->lock
);
289 if (nlbufsiz
< NFULNL_NLBUFSIZ_DEFAULT
)
291 else if (nlbufsiz
> 131072)
294 inst
->nlbufsiz
= nlbufsiz
;
297 spin_unlock_bh(&inst
->lock
);
303 nfulnl_set_timeout(struct nfulnl_instance
*inst
, u_int32_t timeout
)
305 spin_lock_bh(&inst
->lock
);
306 inst
->flushtimeout
= timeout
;
307 spin_unlock_bh(&inst
->lock
);
313 nfulnl_set_qthresh(struct nfulnl_instance
*inst
, u_int32_t qthresh
)
315 spin_lock_bh(&inst
->lock
);
316 inst
->qthreshold
= qthresh
;
317 spin_unlock_bh(&inst
->lock
);
323 nfulnl_set_flags(struct nfulnl_instance
*inst
, u_int16_t flags
)
325 spin_lock_bh(&inst
->lock
);
327 spin_unlock_bh(&inst
->lock
);
332 static struct sk_buff
*nfulnl_alloc_skb(unsigned int inst_size
,
333 unsigned int pkt_size
)
338 UDEBUG("entered (%u, %u)\n", inst_size
, pkt_size
);
340 /* alloc skb which should be big enough for a whole multipart
341 * message. WARNING: has to be <= 128k due to slab restrictions */
343 n
= max(inst_size
, pkt_size
);
344 skb
= alloc_skb(n
, GFP_ATOMIC
);
346 PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n",
350 /* try to allocate only as much as we need for current
353 skb
= alloc_skb(pkt_size
, GFP_ATOMIC
);
355 PRINTR("nfnetlink_log: can't even alloc %u "
356 "bytes\n", pkt_size
);
364 __nfulnl_send(struct nfulnl_instance
*inst
)
372 inst
->lastnlh
->nlmsg_type
= NLMSG_DONE
;
374 status
= nfnetlink_unicast(inst
->skb
, inst
->peer_pid
, MSG_DONTWAIT
);
376 UDEBUG("netlink_unicast() failed\n");
377 /* FIXME: statistics */
382 inst
->lastnlh
= NULL
;
387 static void nfulnl_timer(unsigned long data
)
389 struct nfulnl_instance
*inst
= (struct nfulnl_instance
*)data
;
391 UDEBUG("timer function called, flushing buffer\n");
393 spin_lock_bh(&inst
->lock
);
395 spin_unlock_bh(&inst
->lock
);
399 /* This is an inline function, we don't really care about a long
400 * list of arguments */
402 __build_packet_message(struct nfulnl_instance
*inst
,
403 const struct sk_buff
*skb
,
404 unsigned int data_len
,
406 unsigned int hooknum
,
407 const struct net_device
*indev
,
408 const struct net_device
*outdev
,
409 const struct nf_loginfo
*li
,
410 const char *prefix
, unsigned int plen
)
412 struct nfulnl_msg_packet_hdr pmsg
;
413 struct nlmsghdr
*nlh
;
414 struct nfgenmsg
*nfmsg
;
416 sk_buff_data_t old_tail
= inst
->skb
->tail
;
420 nlh
= NLMSG_PUT(inst
->skb
, 0, 0,
421 NFNL_SUBSYS_ULOG
<< 8 | NFULNL_MSG_PACKET
,
422 sizeof(struct nfgenmsg
));
423 nfmsg
= NLMSG_DATA(nlh
);
424 nfmsg
->nfgen_family
= pf
;
425 nfmsg
->version
= NFNETLINK_V0
;
426 nfmsg
->res_id
= htons(inst
->group_num
);
428 pmsg
.hw_protocol
= skb
->protocol
;
431 NFA_PUT(inst
->skb
, NFULA_PACKET_HDR
, sizeof(pmsg
), &pmsg
);
434 NFA_PUT(inst
->skb
, NFULA_PREFIX
, plen
, prefix
);
437 tmp_uint
= htonl(indev
->ifindex
);
438 #ifndef CONFIG_BRIDGE_NETFILTER
439 NFA_PUT(inst
->skb
, NFULA_IFINDEX_INDEV
, sizeof(tmp_uint
),
442 if (pf
== PF_BRIDGE
) {
443 /* Case 1: outdev is physical input device, we need to
444 * look for bridge group (when called from
445 * netfilter_bridge) */
446 NFA_PUT(inst
->skb
, NFULA_IFINDEX_PHYSINDEV
,
447 sizeof(tmp_uint
), &tmp_uint
);
448 /* this is the bridge group "brX" */
449 tmp_uint
= htonl(indev
->br_port
->br
->dev
->ifindex
);
450 NFA_PUT(inst
->skb
, NFULA_IFINDEX_INDEV
,
451 sizeof(tmp_uint
), &tmp_uint
);
453 /* Case 2: indev is bridge group, we need to look for
454 * physical device (when called from ipv4) */
455 NFA_PUT(inst
->skb
, NFULA_IFINDEX_INDEV
,
456 sizeof(tmp_uint
), &tmp_uint
);
457 if (skb
->nf_bridge
&& skb
->nf_bridge
->physindev
) {
459 htonl(skb
->nf_bridge
->physindev
->ifindex
);
460 NFA_PUT(inst
->skb
, NFULA_IFINDEX_PHYSINDEV
,
461 sizeof(tmp_uint
), &tmp_uint
);
468 tmp_uint
= htonl(outdev
->ifindex
);
469 #ifndef CONFIG_BRIDGE_NETFILTER
470 NFA_PUT(inst
->skb
, NFULA_IFINDEX_OUTDEV
, sizeof(tmp_uint
),
473 if (pf
== PF_BRIDGE
) {
474 /* Case 1: outdev is physical output device, we need to
475 * look for bridge group (when called from
476 * netfilter_bridge) */
477 NFA_PUT(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
478 sizeof(tmp_uint
), &tmp_uint
);
479 /* this is the bridge group "brX" */
480 tmp_uint
= htonl(outdev
->br_port
->br
->dev
->ifindex
);
481 NFA_PUT(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
482 sizeof(tmp_uint
), &tmp_uint
);
484 /* Case 2: indev is a bridge group, we need to look
485 * for physical device (when called from ipv4) */
486 NFA_PUT(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
487 sizeof(tmp_uint
), &tmp_uint
);
488 if (skb
->nf_bridge
&& skb
->nf_bridge
->physoutdev
) {
490 htonl(skb
->nf_bridge
->physoutdev
->ifindex
);
491 NFA_PUT(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
492 sizeof(tmp_uint
), &tmp_uint
);
499 tmp_uint
= htonl(skb
->mark
);
500 NFA_PUT(inst
->skb
, NFULA_MARK
, sizeof(tmp_uint
), &tmp_uint
);
503 if (indev
&& skb
->dev
&& skb
->dev
->hard_header_parse
) {
504 struct nfulnl_msg_packet_hw phw
;
505 int len
= skb
->dev
->hard_header_parse((struct sk_buff
*)skb
,
507 phw
.hw_addrlen
= htons(len
);
508 NFA_PUT(inst
->skb
, NFULA_HWADDR
, sizeof(phw
), &phw
);
511 if (skb
->tstamp
.tv64
) {
512 struct nfulnl_msg_packet_timestamp ts
;
513 struct timeval tv
= ktime_to_timeval(skb
->tstamp
);
514 ts
.sec
= cpu_to_be64(tv
.tv_sec
);
515 ts
.usec
= cpu_to_be64(tv
.tv_usec
);
517 NFA_PUT(inst
->skb
, NFULA_TIMESTAMP
, sizeof(ts
), &ts
);
522 read_lock_bh(&skb
->sk
->sk_callback_lock
);
523 if (skb
->sk
->sk_socket
&& skb
->sk
->sk_socket
->file
) {
524 __be32 uid
= htonl(skb
->sk
->sk_socket
->file
->f_uid
);
525 /* need to unlock here since NFA_PUT may goto */
526 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
527 NFA_PUT(inst
->skb
, NFULA_UID
, sizeof(uid
), &uid
);
529 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
532 /* local sequence number */
533 if (inst
->flags
& NFULNL_CFG_F_SEQ
) {
534 tmp_uint
= htonl(inst
->seq
++);
535 NFA_PUT(inst
->skb
, NFULA_SEQ
, sizeof(tmp_uint
), &tmp_uint
);
537 /* global sequence number */
538 if (inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
) {
539 tmp_uint
= htonl(atomic_inc_return(&global_seq
));
540 NFA_PUT(inst
->skb
, NFULA_SEQ_GLOBAL
, sizeof(tmp_uint
), &tmp_uint
);
545 int size
= NFA_LENGTH(data_len
);
547 if (skb_tailroom(inst
->skb
) < (int)NFA_SPACE(data_len
)) {
548 printk(KERN_WARNING
"nfnetlink_log: no tailroom!\n");
552 nfa
= (struct nfattr
*)skb_put(inst
->skb
, NFA_ALIGN(size
));
553 nfa
->nfa_type
= NFULA_PAYLOAD
;
556 if (skb_copy_bits(skb
, 0, NFA_DATA(nfa
), data_len
))
560 nlh
->nlmsg_len
= inst
->skb
->tail
- old_tail
;
565 UDEBUG("nlmsg_failure\n");
567 PRINTR(KERN_ERR
"nfnetlink_log: error creating log nlmsg\n");
571 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
573 static struct nf_loginfo default_loginfo
= {
574 .type
= NF_LOG_TYPE_ULOG
,
584 /* log handler for internal netfilter logging api */
586 nfulnl_log_packet(unsigned int pf
,
587 unsigned int hooknum
,
588 const struct sk_buff
*skb
,
589 const struct net_device
*in
,
590 const struct net_device
*out
,
591 const struct nf_loginfo
*li_user
,
594 unsigned int size
, data_len
;
595 struct nfulnl_instance
*inst
;
596 const struct nf_loginfo
*li
;
597 unsigned int qthreshold
;
598 unsigned int nlbufsiz
;
601 if (li_user
&& li_user
->type
== NF_LOG_TYPE_ULOG
)
604 li
= &default_loginfo
;
606 inst
= instance_lookup_get(li
->u
.ulog
.group
);
608 inst
= instance_lookup_get(0);
610 PRINTR("nfnetlink_log: trying to log packet, "
611 "but no instance for group %u\n", li
->u
.ulog
.group
);
617 plen
= strlen(prefix
) + 1;
619 /* all macros expand to constant values at compile time */
620 /* FIXME: do we want to make the size calculation conditional based on
621 * what is actually present? way more branches and checks, but more
622 * memory efficient... */
623 size
= NLMSG_SPACE(sizeof(struct nfgenmsg
))
624 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr
))
625 + NFA_SPACE(sizeof(u_int32_t
)) /* ifindex */
626 + NFA_SPACE(sizeof(u_int32_t
)) /* ifindex */
627 #ifdef CONFIG_BRIDGE_NETFILTER
628 + NFA_SPACE(sizeof(u_int32_t
)) /* ifindex */
629 + NFA_SPACE(sizeof(u_int32_t
)) /* ifindex */
631 + NFA_SPACE(sizeof(u_int32_t
)) /* mark */
632 + NFA_SPACE(sizeof(u_int32_t
)) /* uid */
633 + NFA_SPACE(plen
) /* prefix */
634 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw
))
635 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp
));
637 UDEBUG("initial size=%u\n", size
);
639 spin_lock_bh(&inst
->lock
);
641 if (inst
->flags
& NFULNL_CFG_F_SEQ
)
642 size
+= NFA_SPACE(sizeof(u_int32_t
));
643 if (inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
)
644 size
+= NFA_SPACE(sizeof(u_int32_t
));
646 qthreshold
= inst
->qthreshold
;
647 /* per-rule qthreshold overrides per-instance */
648 if (qthreshold
> li
->u
.ulog
.qthreshold
)
649 qthreshold
= li
->u
.ulog
.qthreshold
;
651 switch (inst
->copy_mode
) {
652 case NFULNL_COPY_META
:
653 case NFULNL_COPY_NONE
:
657 case NFULNL_COPY_PACKET
:
658 if (inst
->copy_range
== 0
659 || inst
->copy_range
> skb
->len
)
662 data_len
= inst
->copy_range
;
664 size
+= NFA_SPACE(data_len
);
665 UDEBUG("copy_packet, therefore size now %u\n", size
);
669 spin_unlock_bh(&inst
->lock
);
674 if (size
> inst
->nlbufsiz
)
677 nlbufsiz
= inst
->nlbufsiz
;
680 if (!(inst
->skb
= nfulnl_alloc_skb(nlbufsiz
, size
))) {
681 UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n",
682 inst
->nlbufsiz
, size
);
685 } else if (inst
->qlen
>= qthreshold
||
686 size
> skb_tailroom(inst
->skb
)) {
687 /* either the queue len is too high or we don't have
688 * enough room in the skb left. flush to userspace. */
689 UDEBUG("flushing old skb\n");
691 /* timer "holds" one reference (we have another one) */
692 if (del_timer(&inst
->timer
))
696 if (!(inst
->skb
= nfulnl_alloc_skb(nlbufsiz
, size
))) {
697 UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n",
698 inst
->nlbufsiz
, size
);
703 UDEBUG("qlen %d, qthreshold %d\n", inst
->qlen
, qthreshold
);
706 __build_packet_message(inst
, skb
, data_len
, pf
,
707 hooknum
, in
, out
, li
, prefix
, plen
);
709 /* timer_pending always called within inst->lock, so there
710 * is no chance of a race here */
711 if (!timer_pending(&inst
->timer
)) {
713 inst
->timer
.expires
= jiffies
+ (inst
->flushtimeout
*HZ
/100);
714 add_timer(&inst
->timer
);
718 spin_unlock_bh(&inst
->lock
);
723 UDEBUG("error allocating skb\n");
724 /* FIXME: statistics */
725 goto unlock_and_release
;
729 nfulnl_rcv_nl_event(struct notifier_block
*this,
730 unsigned long event
, void *ptr
)
732 struct netlink_notify
*n
= ptr
;
734 if (event
== NETLINK_URELEASE
&&
735 n
->protocol
== NETLINK_NETFILTER
&& n
->pid
) {
738 /* destroy all instances for this pid */
739 write_lock_bh(&instances_lock
);
740 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
741 struct hlist_node
*tmp
, *t2
;
742 struct nfulnl_instance
*inst
;
743 struct hlist_head
*head
= &instance_table
[i
];
745 hlist_for_each_entry_safe(inst
, tmp
, t2
, head
, hlist
) {
746 UDEBUG("node = %p\n", inst
);
747 if (n
->pid
== inst
->peer_pid
)
748 __instance_destroy(inst
);
751 write_unlock_bh(&instances_lock
);
756 static struct notifier_block nfulnl_rtnl_notifier
= {
757 .notifier_call
= nfulnl_rcv_nl_event
,
761 nfulnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
762 struct nlmsghdr
*nlh
, struct nfattr
*nfqa
[])
767 static struct nf_logger nfulnl_logger
= {
768 .name
= "nfnetlink_log",
769 .logfn
= &nfulnl_log_packet
,
773 static const int nfula_min
[NFULA_MAX
] = {
774 [NFULA_PACKET_HDR
-1] = sizeof(struct nfulnl_msg_packet_hdr
),
775 [NFULA_MARK
-1] = sizeof(u_int32_t
),
776 [NFULA_TIMESTAMP
-1] = sizeof(struct nfulnl_msg_packet_timestamp
),
777 [NFULA_IFINDEX_INDEV
-1] = sizeof(u_int32_t
),
778 [NFULA_IFINDEX_OUTDEV
-1]= sizeof(u_int32_t
),
779 [NFULA_IFINDEX_PHYSINDEV
-1] = sizeof(u_int32_t
),
780 [NFULA_IFINDEX_PHYSOUTDEV
-1] = sizeof(u_int32_t
),
781 [NFULA_HWADDR
-1] = sizeof(struct nfulnl_msg_packet_hw
),
782 [NFULA_PAYLOAD
-1] = 0,
783 [NFULA_PREFIX
-1] = 0,
784 [NFULA_UID
-1] = sizeof(u_int32_t
),
785 [NFULA_SEQ
-1] = sizeof(u_int32_t
),
786 [NFULA_SEQ_GLOBAL
-1] = sizeof(u_int32_t
),
789 static const int nfula_cfg_min
[NFULA_CFG_MAX
] = {
790 [NFULA_CFG_CMD
-1] = sizeof(struct nfulnl_msg_config_cmd
),
791 [NFULA_CFG_MODE
-1] = sizeof(struct nfulnl_msg_config_mode
),
792 [NFULA_CFG_TIMEOUT
-1] = sizeof(u_int32_t
),
793 [NFULA_CFG_QTHRESH
-1] = sizeof(u_int32_t
),
794 [NFULA_CFG_NLBUFSIZ
-1] = sizeof(u_int32_t
),
795 [NFULA_CFG_FLAGS
-1] = sizeof(u_int16_t
),
799 nfulnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
800 struct nlmsghdr
*nlh
, struct nfattr
*nfula
[])
802 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
803 u_int16_t group_num
= ntohs(nfmsg
->res_id
);
804 struct nfulnl_instance
*inst
;
807 UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh
->nlmsg_type
));
809 if (nfattr_bad_size(nfula
, NFULA_CFG_MAX
, nfula_cfg_min
)) {
810 UDEBUG("bad attribute size\n");
814 inst
= instance_lookup_get(group_num
);
815 if (nfula
[NFULA_CFG_CMD
-1]) {
816 u_int8_t pf
= nfmsg
->nfgen_family
;
817 struct nfulnl_msg_config_cmd
*cmd
;
818 cmd
= NFA_DATA(nfula
[NFULA_CFG_CMD
-1]);
819 UDEBUG("found CFG_CMD for\n");
821 switch (cmd
->command
) {
822 case NFULNL_CFG_CMD_BIND
:
828 inst
= instance_create(group_num
,
829 NETLINK_CB(skb
).pid
);
835 case NFULNL_CFG_CMD_UNBIND
:
841 if (inst
->peer_pid
!= NETLINK_CB(skb
).pid
) {
846 instance_destroy(inst
);
848 case NFULNL_CFG_CMD_PF_BIND
:
849 UDEBUG("registering log handler for pf=%u\n", pf
);
850 ret
= nf_log_register(pf
, &nfulnl_logger
);
852 case NFULNL_CFG_CMD_PF_UNBIND
:
853 UDEBUG("unregistering log handler for pf=%u\n", pf
);
854 /* This is a bug and a feature. We cannot unregister
855 * other handlers, like nfnetlink_inst can */
856 nf_log_unregister_pf(pf
);
867 UDEBUG("no config command, and no instance for "
868 "group=%u pid=%u =>ENOENT\n",
869 group_num
, NETLINK_CB(skb
).pid
);
874 if (inst
->peer_pid
!= NETLINK_CB(skb
).pid
) {
875 UDEBUG("no config command, and wrong pid\n");
881 if (nfula
[NFULA_CFG_MODE
-1]) {
882 struct nfulnl_msg_config_mode
*params
;
883 params
= NFA_DATA(nfula
[NFULA_CFG_MODE
-1]);
885 nfulnl_set_mode(inst
, params
->copy_mode
,
886 ntohl(params
->copy_range
));
889 if (nfula
[NFULA_CFG_TIMEOUT
-1]) {
891 *(__be32
*)NFA_DATA(nfula
[NFULA_CFG_TIMEOUT
-1]);
893 nfulnl_set_timeout(inst
, ntohl(timeout
));
896 if (nfula
[NFULA_CFG_NLBUFSIZ
-1]) {
898 *(__be32
*)NFA_DATA(nfula
[NFULA_CFG_NLBUFSIZ
-1]);
900 nfulnl_set_nlbufsiz(inst
, ntohl(nlbufsiz
));
903 if (nfula
[NFULA_CFG_QTHRESH
-1]) {
905 *(__be32
*)NFA_DATA(nfula
[NFULA_CFG_QTHRESH
-1]);
907 nfulnl_set_qthresh(inst
, ntohl(qthresh
));
910 if (nfula
[NFULA_CFG_FLAGS
-1]) {
912 *(__be16
*)NFA_DATA(nfula
[NFULA_CFG_FLAGS
-1]);
913 nfulnl_set_flags(inst
, ntohs(flags
));
922 static struct nfnl_callback nfulnl_cb
[NFULNL_MSG_MAX
] = {
923 [NFULNL_MSG_PACKET
] = { .call
= nfulnl_recv_unsupp
,
924 .attr_count
= NFULA_MAX
, },
925 [NFULNL_MSG_CONFIG
] = { .call
= nfulnl_recv_config
,
926 .attr_count
= NFULA_CFG_MAX
, },
929 static struct nfnetlink_subsystem nfulnl_subsys
= {
931 .subsys_id
= NFNL_SUBSYS_ULOG
,
932 .cb_count
= NFULNL_MSG_MAX
,
936 #ifdef CONFIG_PROC_FS
941 static struct hlist_node
*get_first(struct seq_file
*seq
)
943 struct iter_state
*st
= seq
->private;
948 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
949 if (!hlist_empty(&instance_table
[st
->bucket
]))
950 return instance_table
[st
->bucket
].first
;
955 static struct hlist_node
*get_next(struct seq_file
*seq
, struct hlist_node
*h
)
957 struct iter_state
*st
= seq
->private;
961 if (++st
->bucket
>= INSTANCE_BUCKETS
)
964 h
= instance_table
[st
->bucket
].first
;
969 static struct hlist_node
*get_idx(struct seq_file
*seq
, loff_t pos
)
971 struct hlist_node
*head
;
972 head
= get_first(seq
);
975 while (pos
&& (head
= get_next(seq
, head
)))
977 return pos
? NULL
: head
;
980 static void *seq_start(struct seq_file
*seq
, loff_t
*pos
)
982 read_lock_bh(&instances_lock
);
983 return get_idx(seq
, *pos
);
986 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
989 return get_next(s
, v
);
992 static void seq_stop(struct seq_file
*s
, void *v
)
994 read_unlock_bh(&instances_lock
);
997 static int seq_show(struct seq_file
*s
, void *v
)
999 const struct nfulnl_instance
*inst
= v
;
1001 return seq_printf(s
, "%5d %6d %5d %1d %5d %6d %2d\n",
1003 inst
->peer_pid
, inst
->qlen
,
1004 inst
->copy_mode
, inst
->copy_range
,
1005 inst
->flushtimeout
, atomic_read(&inst
->use
));
1008 static struct seq_operations nful_seq_ops
= {
1015 static int nful_open(struct inode
*inode
, struct file
*file
)
1017 struct seq_file
*seq
;
1018 struct iter_state
*is
;
1021 is
= kzalloc(sizeof(*is
), GFP_KERNEL
);
1024 ret
= seq_open(file
, &nful_seq_ops
);
1027 seq
= file
->private_data
;
1035 static const struct file_operations nful_file_ops
= {
1036 .owner
= THIS_MODULE
,
1039 .llseek
= seq_lseek
,
1040 .release
= seq_release_private
,
1043 #endif /* PROC_FS */
1045 static int __init
nfnetlink_log_init(void)
1047 int i
, status
= -ENOMEM
;
1048 #ifdef CONFIG_PROC_FS
1049 struct proc_dir_entry
*proc_nful
;
1052 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
1053 INIT_HLIST_HEAD(&instance_table
[i
]);
1055 /* it's not really all that important to have a random value, so
1056 * we can do this from the init function, even if there hasn't
1057 * been that much entropy yet */
1058 get_random_bytes(&hash_init
, sizeof(hash_init
));
1060 netlink_register_notifier(&nfulnl_rtnl_notifier
);
1061 status
= nfnetlink_subsys_register(&nfulnl_subsys
);
1063 printk(KERN_ERR
"log: failed to create netlink socket\n");
1064 goto cleanup_netlink_notifier
;
1067 #ifdef CONFIG_PROC_FS
1068 proc_nful
= create_proc_entry("nfnetlink_log", 0440,
1069 proc_net_netfilter
);
1071 goto cleanup_subsys
;
1072 proc_nful
->proc_fops
= &nful_file_ops
;
1076 #ifdef CONFIG_PROC_FS
1078 nfnetlink_subsys_unregister(&nfulnl_subsys
);
1080 cleanup_netlink_notifier
:
1081 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
1085 static void __exit
nfnetlink_log_fini(void)
1087 nf_log_unregister(&nfulnl_logger
);
1088 #ifdef CONFIG_PROC_FS
1089 remove_proc_entry("nfnetlink_log", proc_net_netfilter
);
1091 nfnetlink_subsys_unregister(&nfulnl_subsys
);
1092 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
1095 MODULE_DESCRIPTION("netfilter userspace logging");
1096 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1097 MODULE_LICENSE("GPL");
1098 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG
);
1100 module_init(nfnetlink_log_init
);
1101 module_exit(nfnetlink_log_fini
);