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>
33 #include <asm/atomic.h>
35 #ifdef CONFIG_BRIDGE_NETFILTER
36 #include "../bridge/br_private.h"
39 #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
40 #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
41 #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
43 #define PRINTR(x, args...) do { if (net_ratelimit()) \
44 printk(x, ## args); } while (0);
47 #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \
48 __FILE__, __LINE__, __FUNCTION__, \
51 #define UDEBUG(x, ...)
54 struct nfulnl_instance
{
55 struct hlist_node hlist
; /* global list of instances */
57 atomic_t use
; /* use count */
59 unsigned int qlen
; /* number of nlmsgs in skb */
60 struct sk_buff
*skb
; /* pre-allocatd skb */
61 struct timer_list timer
;
62 int peer_pid
; /* PID 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 */
75 static DEFINE_RWLOCK(instances_lock
);
76 static atomic_t global_seq
;
78 #define INSTANCE_BUCKETS 16
79 static struct hlist_head instance_table
[INSTANCE_BUCKETS
];
80 static unsigned int hash_init
;
82 static inline u_int8_t
instance_hashfn(u_int16_t group_num
)
84 return ((group_num
& 0xff) % INSTANCE_BUCKETS
);
87 static struct nfulnl_instance
*
88 __instance_lookup(u_int16_t group_num
)
90 struct hlist_head
*head
;
91 struct hlist_node
*pos
;
92 struct nfulnl_instance
*inst
;
94 UDEBUG("entering (group_num=%u)\n", group_num
);
96 head
= &instance_table
[instance_hashfn(group_num
)];
97 hlist_for_each_entry(inst
, pos
, head
, hlist
) {
98 if (inst
->group_num
== group_num
)
105 instance_get(struct nfulnl_instance
*inst
)
107 atomic_inc(&inst
->use
);
110 static struct nfulnl_instance
*
111 instance_lookup_get(u_int16_t group_num
)
113 struct nfulnl_instance
*inst
;
115 read_lock_bh(&instances_lock
);
116 inst
= __instance_lookup(group_num
);
119 read_unlock_bh(&instances_lock
);
125 instance_put(struct nfulnl_instance
*inst
)
127 if (inst
&& atomic_dec_and_test(&inst
->use
)) {
128 UDEBUG("kfree(inst=%p)\n", inst
);
130 module_put(THIS_MODULE
);
134 static void nfulnl_timer(unsigned long data
);
136 static struct nfulnl_instance
*
137 instance_create(u_int16_t group_num
, int pid
)
139 struct nfulnl_instance
*inst
;
141 UDEBUG("entering (group_num=%u, pid=%d)\n", group_num
,
144 write_lock_bh(&instances_lock
);
145 if (__instance_lookup(group_num
)) {
147 UDEBUG("aborting, instance already exists\n");
151 inst
= kzalloc(sizeof(*inst
), GFP_ATOMIC
);
155 INIT_HLIST_NODE(&inst
->hlist
);
156 spin_lock_init(&inst
->lock
);
157 /* needs to be two, since we _put() after creation */
158 atomic_set(&inst
->use
, 2);
160 setup_timer(&inst
->timer
, nfulnl_timer
, (unsigned long)inst
);
162 inst
->peer_pid
= pid
;
163 inst
->group_num
= group_num
;
165 inst
->qthreshold
= NFULNL_QTHRESH_DEFAULT
;
166 inst
->flushtimeout
= NFULNL_TIMEOUT_DEFAULT
;
167 inst
->nlbufsiz
= NFULNL_NLBUFSIZ_DEFAULT
;
168 inst
->copy_mode
= NFULNL_COPY_PACKET
;
169 inst
->copy_range
= 0xffff;
171 if (!try_module_get(THIS_MODULE
))
174 hlist_add_head(&inst
->hlist
,
175 &instance_table
[instance_hashfn(group_num
)]);
177 UDEBUG("newly added node: %p, next=%p\n", &inst
->hlist
,
180 write_unlock_bh(&instances_lock
);
187 write_unlock_bh(&instances_lock
);
191 static int __nfulnl_send(struct nfulnl_instance
*inst
);
194 __instance_destroy(struct nfulnl_instance
*inst
)
196 /* first pull it out of the global list */
197 UDEBUG("removing instance %p (queuenum=%u) from hash\n",
198 inst
, inst
->group_num
);
200 hlist_del(&inst
->hlist
);
202 /* then flush all pending packets from skb */
204 spin_lock_bh(&inst
->lock
);
206 /* timer "holds" one reference (we have one more) */
207 if (del_timer(&inst
->timer
))
212 kfree_skb(inst
->skb
);
216 spin_unlock_bh(&inst
->lock
);
218 /* and finally put the refcount */
223 instance_destroy(struct nfulnl_instance
*inst
)
225 write_lock_bh(&instances_lock
);
226 __instance_destroy(inst
);
227 write_unlock_bh(&instances_lock
);
231 nfulnl_set_mode(struct nfulnl_instance
*inst
, u_int8_t mode
,
236 spin_lock_bh(&inst
->lock
);
239 case NFULNL_COPY_NONE
:
240 case NFULNL_COPY_META
:
241 inst
->copy_mode
= mode
;
242 inst
->copy_range
= 0;
245 case NFULNL_COPY_PACKET
:
246 inst
->copy_mode
= mode
;
247 /* we're using struct nfattr which has 16bit nfa_len */
249 inst
->copy_range
= 0xffff;
251 inst
->copy_range
= range
;
259 spin_unlock_bh(&inst
->lock
);
265 nfulnl_set_nlbufsiz(struct nfulnl_instance
*inst
, u_int32_t nlbufsiz
)
269 spin_lock_bh(&inst
->lock
);
270 if (nlbufsiz
< NFULNL_NLBUFSIZ_DEFAULT
)
272 else if (nlbufsiz
> 131072)
275 inst
->nlbufsiz
= nlbufsiz
;
278 spin_unlock_bh(&inst
->lock
);
284 nfulnl_set_timeout(struct nfulnl_instance
*inst
, u_int32_t timeout
)
286 spin_lock_bh(&inst
->lock
);
287 inst
->flushtimeout
= timeout
;
288 spin_unlock_bh(&inst
->lock
);
294 nfulnl_set_qthresh(struct nfulnl_instance
*inst
, u_int32_t qthresh
)
296 spin_lock_bh(&inst
->lock
);
297 inst
->qthreshold
= qthresh
;
298 spin_unlock_bh(&inst
->lock
);
304 nfulnl_set_flags(struct nfulnl_instance
*inst
, u_int16_t flags
)
306 spin_lock_bh(&inst
->lock
);
308 spin_unlock_bh(&inst
->lock
);
313 static struct sk_buff
*nfulnl_alloc_skb(unsigned int inst_size
,
314 unsigned int pkt_size
)
319 UDEBUG("entered (%u, %u)\n", inst_size
, pkt_size
);
321 /* alloc skb which should be big enough for a whole multipart
322 * message. WARNING: has to be <= 128k due to slab restrictions */
324 n
= max(inst_size
, pkt_size
);
325 skb
= alloc_skb(n
, GFP_ATOMIC
);
327 PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n",
331 /* try to allocate only as much as we need for current
334 skb
= alloc_skb(pkt_size
, GFP_ATOMIC
);
336 PRINTR("nfnetlink_log: can't even alloc %u "
337 "bytes\n", pkt_size
);
345 __nfulnl_send(struct nfulnl_instance
*inst
)
350 NLMSG_PUT(inst
->skb
, 0, 0,
352 sizeof(struct nfgenmsg
));
354 status
= nfnetlink_unicast(inst
->skb
, inst
->peer_pid
, MSG_DONTWAIT
);
356 UDEBUG("netlink_unicast() failed\n");
357 /* FIXME: statistics */
367 static void nfulnl_timer(unsigned long data
)
369 struct nfulnl_instance
*inst
= (struct nfulnl_instance
*)data
;
371 UDEBUG("timer function called, flushing buffer\n");
373 spin_lock_bh(&inst
->lock
);
376 spin_unlock_bh(&inst
->lock
);
380 /* This is an inline function, we don't really care about a long
381 * list of arguments */
383 __build_packet_message(struct nfulnl_instance
*inst
,
384 const struct sk_buff
*skb
,
385 unsigned int data_len
,
387 unsigned int hooknum
,
388 const struct net_device
*indev
,
389 const struct net_device
*outdev
,
390 const struct nf_loginfo
*li
,
391 const char *prefix
, unsigned int plen
)
393 struct nfulnl_msg_packet_hdr pmsg
;
394 struct nlmsghdr
*nlh
;
395 struct nfgenmsg
*nfmsg
;
397 sk_buff_data_t old_tail
= inst
->skb
->tail
;
401 nlh
= NLMSG_PUT(inst
->skb
, 0, 0,
402 NFNL_SUBSYS_ULOG
<< 8 | NFULNL_MSG_PACKET
,
403 sizeof(struct nfgenmsg
));
404 nfmsg
= NLMSG_DATA(nlh
);
405 nfmsg
->nfgen_family
= pf
;
406 nfmsg
->version
= NFNETLINK_V0
;
407 nfmsg
->res_id
= htons(inst
->group_num
);
409 pmsg
.hw_protocol
= skb
->protocol
;
412 NFA_PUT(inst
->skb
, NFULA_PACKET_HDR
, sizeof(pmsg
), &pmsg
);
415 NFA_PUT(inst
->skb
, NFULA_PREFIX
, plen
, prefix
);
418 tmp_uint
= htonl(indev
->ifindex
);
419 #ifndef CONFIG_BRIDGE_NETFILTER
420 NFA_PUT(inst
->skb
, NFULA_IFINDEX_INDEV
, sizeof(tmp_uint
),
423 if (pf
== PF_BRIDGE
) {
424 /* Case 1: outdev is physical input device, we need to
425 * look for bridge group (when called from
426 * netfilter_bridge) */
427 NFA_PUT(inst
->skb
, NFULA_IFINDEX_PHYSINDEV
,
428 sizeof(tmp_uint
), &tmp_uint
);
429 /* this is the bridge group "brX" */
430 tmp_uint
= htonl(indev
->br_port
->br
->dev
->ifindex
);
431 NFA_PUT(inst
->skb
, NFULA_IFINDEX_INDEV
,
432 sizeof(tmp_uint
), &tmp_uint
);
434 /* Case 2: indev is bridge group, we need to look for
435 * physical device (when called from ipv4) */
436 NFA_PUT(inst
->skb
, NFULA_IFINDEX_INDEV
,
437 sizeof(tmp_uint
), &tmp_uint
);
438 if (skb
->nf_bridge
&& skb
->nf_bridge
->physindev
) {
440 htonl(skb
->nf_bridge
->physindev
->ifindex
);
441 NFA_PUT(inst
->skb
, NFULA_IFINDEX_PHYSINDEV
,
442 sizeof(tmp_uint
), &tmp_uint
);
449 tmp_uint
= htonl(outdev
->ifindex
);
450 #ifndef CONFIG_BRIDGE_NETFILTER
451 NFA_PUT(inst
->skb
, NFULA_IFINDEX_OUTDEV
, sizeof(tmp_uint
),
454 if (pf
== PF_BRIDGE
) {
455 /* Case 1: outdev is physical output device, we need to
456 * look for bridge group (when called from
457 * netfilter_bridge) */
458 NFA_PUT(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
459 sizeof(tmp_uint
), &tmp_uint
);
460 /* this is the bridge group "brX" */
461 tmp_uint
= htonl(outdev
->br_port
->br
->dev
->ifindex
);
462 NFA_PUT(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
463 sizeof(tmp_uint
), &tmp_uint
);
465 /* Case 2: indev is a bridge group, we need to look
466 * for physical device (when called from ipv4) */
467 NFA_PUT(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
468 sizeof(tmp_uint
), &tmp_uint
);
469 if (skb
->nf_bridge
&& skb
->nf_bridge
->physoutdev
) {
471 htonl(skb
->nf_bridge
->physoutdev
->ifindex
);
472 NFA_PUT(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
473 sizeof(tmp_uint
), &tmp_uint
);
480 tmp_uint
= htonl(skb
->mark
);
481 NFA_PUT(inst
->skb
, NFULA_MARK
, sizeof(tmp_uint
), &tmp_uint
);
484 if (indev
&& skb
->dev
&& skb
->dev
->hard_header_parse
) {
485 struct nfulnl_msg_packet_hw phw
;
486 int len
= skb
->dev
->hard_header_parse((struct sk_buff
*)skb
,
488 phw
.hw_addrlen
= htons(len
);
489 NFA_PUT(inst
->skb
, NFULA_HWADDR
, sizeof(phw
), &phw
);
492 if (skb
->tstamp
.tv64
) {
493 struct nfulnl_msg_packet_timestamp ts
;
494 struct timeval tv
= ktime_to_timeval(skb
->tstamp
);
495 ts
.sec
= cpu_to_be64(tv
.tv_sec
);
496 ts
.usec
= cpu_to_be64(tv
.tv_usec
);
498 NFA_PUT(inst
->skb
, NFULA_TIMESTAMP
, sizeof(ts
), &ts
);
503 read_lock_bh(&skb
->sk
->sk_callback_lock
);
504 if (skb
->sk
->sk_socket
&& skb
->sk
->sk_socket
->file
) {
505 __be32 uid
= htonl(skb
->sk
->sk_socket
->file
->f_uid
);
506 /* need to unlock here since NFA_PUT may goto */
507 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
508 NFA_PUT(inst
->skb
, NFULA_UID
, sizeof(uid
), &uid
);
510 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
513 /* local sequence number */
514 if (inst
->flags
& NFULNL_CFG_F_SEQ
) {
515 tmp_uint
= htonl(inst
->seq
++);
516 NFA_PUT(inst
->skb
, NFULA_SEQ
, sizeof(tmp_uint
), &tmp_uint
);
518 /* global sequence number */
519 if (inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
) {
520 tmp_uint
= htonl(atomic_inc_return(&global_seq
));
521 NFA_PUT(inst
->skb
, NFULA_SEQ_GLOBAL
, sizeof(tmp_uint
), &tmp_uint
);
526 int size
= NFA_LENGTH(data_len
);
528 if (skb_tailroom(inst
->skb
) < (int)NFA_SPACE(data_len
)) {
529 printk(KERN_WARNING
"nfnetlink_log: no tailroom!\n");
533 nfa
= (struct nfattr
*)skb_put(inst
->skb
, NFA_ALIGN(size
));
534 nfa
->nfa_type
= NFULA_PAYLOAD
;
537 if (skb_copy_bits(skb
, 0, NFA_DATA(nfa
), data_len
))
541 nlh
->nlmsg_len
= inst
->skb
->tail
- old_tail
;
545 UDEBUG("nlmsg_failure\n");
547 PRINTR(KERN_ERR
"nfnetlink_log: error creating log nlmsg\n");
551 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
553 static struct nf_loginfo default_loginfo
= {
554 .type
= NF_LOG_TYPE_ULOG
,
564 /* log handler for internal netfilter logging api */
566 nfulnl_log_packet(unsigned int pf
,
567 unsigned int hooknum
,
568 const struct sk_buff
*skb
,
569 const struct net_device
*in
,
570 const struct net_device
*out
,
571 const struct nf_loginfo
*li_user
,
574 unsigned int size
, data_len
;
575 struct nfulnl_instance
*inst
;
576 const struct nf_loginfo
*li
;
577 unsigned int qthreshold
;
580 if (li_user
&& li_user
->type
== NF_LOG_TYPE_ULOG
)
583 li
= &default_loginfo
;
585 inst
= instance_lookup_get(li
->u
.ulog
.group
);
591 plen
= strlen(prefix
) + 1;
593 /* all macros expand to constant values at compile time */
594 /* FIXME: do we want to make the size calculation conditional based on
595 * what is actually present? way more branches and checks, but more
596 * memory efficient... */
597 size
= NLMSG_SPACE(sizeof(struct nfgenmsg
))
598 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr
))
599 + NFA_SPACE(sizeof(u_int32_t
)) /* ifindex */
600 + NFA_SPACE(sizeof(u_int32_t
)) /* ifindex */
601 #ifdef CONFIG_BRIDGE_NETFILTER
602 + NFA_SPACE(sizeof(u_int32_t
)) /* ifindex */
603 + NFA_SPACE(sizeof(u_int32_t
)) /* ifindex */
605 + NFA_SPACE(sizeof(u_int32_t
)) /* mark */
606 + NFA_SPACE(sizeof(u_int32_t
)) /* uid */
607 + NFA_SPACE(plen
) /* prefix */
608 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw
))
609 + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp
));
611 UDEBUG("initial size=%u\n", size
);
613 spin_lock_bh(&inst
->lock
);
615 if (inst
->flags
& NFULNL_CFG_F_SEQ
)
616 size
+= NFA_SPACE(sizeof(u_int32_t
));
617 if (inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
)
618 size
+= NFA_SPACE(sizeof(u_int32_t
));
620 qthreshold
= inst
->qthreshold
;
621 /* per-rule qthreshold overrides per-instance */
622 if (qthreshold
> li
->u
.ulog
.qthreshold
)
623 qthreshold
= li
->u
.ulog
.qthreshold
;
625 switch (inst
->copy_mode
) {
626 case NFULNL_COPY_META
:
627 case NFULNL_COPY_NONE
:
631 case NFULNL_COPY_PACKET
:
632 if (inst
->copy_range
== 0
633 || inst
->copy_range
> skb
->len
)
636 data_len
= inst
->copy_range
;
638 size
+= NFA_SPACE(data_len
);
639 UDEBUG("copy_packet, therefore size now %u\n", size
);
643 goto unlock_and_release
;
646 if (inst
->qlen
>= qthreshold
||
648 skb_tailroom(inst
->skb
) - sizeof(struct nfgenmsg
))) {
649 /* either the queue len is too high or we don't have
650 * enough room in the skb left. flush to userspace. */
651 UDEBUG("flushing old skb\n");
653 /* timer "holds" one reference (we have another one) */
654 if (del_timer(&inst
->timer
))
660 inst
->skb
= nfulnl_alloc_skb(inst
->nlbufsiz
, size
);
665 UDEBUG("qlen %d, qthreshold %d\n", inst
->qlen
, qthreshold
);
668 __build_packet_message(inst
, skb
, data_len
, pf
,
669 hooknum
, in
, out
, li
, prefix
, plen
);
671 /* timer_pending always called within inst->lock, so there
672 * is no chance of a race here */
673 if (!timer_pending(&inst
->timer
)) {
675 inst
->timer
.expires
= jiffies
+ (inst
->flushtimeout
*HZ
/100);
676 add_timer(&inst
->timer
);
680 spin_unlock_bh(&inst
->lock
);
685 UDEBUG("error allocating skb\n");
686 /* FIXME: statistics */
687 goto unlock_and_release
;
691 nfulnl_rcv_nl_event(struct notifier_block
*this,
692 unsigned long event
, void *ptr
)
694 struct netlink_notify
*n
= ptr
;
696 if (event
== NETLINK_URELEASE
&&
697 n
->protocol
== NETLINK_NETFILTER
&& n
->pid
) {
700 /* destroy all instances for this pid */
701 write_lock_bh(&instances_lock
);
702 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
703 struct hlist_node
*tmp
, *t2
;
704 struct nfulnl_instance
*inst
;
705 struct hlist_head
*head
= &instance_table
[i
];
707 hlist_for_each_entry_safe(inst
, tmp
, t2
, head
, hlist
) {
708 UDEBUG("node = %p\n", inst
);
709 if (n
->pid
== inst
->peer_pid
)
710 __instance_destroy(inst
);
713 write_unlock_bh(&instances_lock
);
718 static struct notifier_block nfulnl_rtnl_notifier
= {
719 .notifier_call
= nfulnl_rcv_nl_event
,
723 nfulnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
724 struct nlmsghdr
*nlh
, struct nfattr
*nfqa
[])
729 static struct nf_logger nfulnl_logger
= {
730 .name
= "nfnetlink_log",
731 .logfn
= &nfulnl_log_packet
,
735 static const int nfula_min
[NFULA_MAX
] = {
736 [NFULA_PACKET_HDR
-1] = sizeof(struct nfulnl_msg_packet_hdr
),
737 [NFULA_MARK
-1] = sizeof(u_int32_t
),
738 [NFULA_TIMESTAMP
-1] = sizeof(struct nfulnl_msg_packet_timestamp
),
739 [NFULA_IFINDEX_INDEV
-1] = sizeof(u_int32_t
),
740 [NFULA_IFINDEX_OUTDEV
-1]= sizeof(u_int32_t
),
741 [NFULA_IFINDEX_PHYSINDEV
-1] = sizeof(u_int32_t
),
742 [NFULA_IFINDEX_PHYSOUTDEV
-1] = sizeof(u_int32_t
),
743 [NFULA_HWADDR
-1] = sizeof(struct nfulnl_msg_packet_hw
),
744 [NFULA_PAYLOAD
-1] = 0,
745 [NFULA_PREFIX
-1] = 0,
746 [NFULA_UID
-1] = sizeof(u_int32_t
),
747 [NFULA_SEQ
-1] = sizeof(u_int32_t
),
748 [NFULA_SEQ_GLOBAL
-1] = sizeof(u_int32_t
),
751 static const int nfula_cfg_min
[NFULA_CFG_MAX
] = {
752 [NFULA_CFG_CMD
-1] = sizeof(struct nfulnl_msg_config_cmd
),
753 [NFULA_CFG_MODE
-1] = sizeof(struct nfulnl_msg_config_mode
),
754 [NFULA_CFG_TIMEOUT
-1] = sizeof(u_int32_t
),
755 [NFULA_CFG_QTHRESH
-1] = sizeof(u_int32_t
),
756 [NFULA_CFG_NLBUFSIZ
-1] = sizeof(u_int32_t
),
757 [NFULA_CFG_FLAGS
-1] = sizeof(u_int16_t
),
761 nfulnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
762 struct nlmsghdr
*nlh
, struct nfattr
*nfula
[])
764 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
765 u_int16_t group_num
= ntohs(nfmsg
->res_id
);
766 struct nfulnl_instance
*inst
;
769 UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh
->nlmsg_type
));
771 if (nfattr_bad_size(nfula
, NFULA_CFG_MAX
, nfula_cfg_min
)) {
772 UDEBUG("bad attribute size\n");
776 inst
= instance_lookup_get(group_num
);
777 if (nfula
[NFULA_CFG_CMD
-1]) {
778 u_int8_t pf
= nfmsg
->nfgen_family
;
779 struct nfulnl_msg_config_cmd
*cmd
;
780 cmd
= NFA_DATA(nfula
[NFULA_CFG_CMD
-1]);
781 UDEBUG("found CFG_CMD for\n");
783 switch (cmd
->command
) {
784 case NFULNL_CFG_CMD_BIND
:
790 inst
= instance_create(group_num
,
791 NETLINK_CB(skb
).pid
);
797 case NFULNL_CFG_CMD_UNBIND
:
803 if (inst
->peer_pid
!= NETLINK_CB(skb
).pid
) {
808 instance_destroy(inst
);
810 case NFULNL_CFG_CMD_PF_BIND
:
811 UDEBUG("registering log handler for pf=%u\n", pf
);
812 ret
= nf_log_register(pf
, &nfulnl_logger
);
814 case NFULNL_CFG_CMD_PF_UNBIND
:
815 UDEBUG("unregistering log handler for pf=%u\n", pf
);
816 /* This is a bug and a feature. We cannot unregister
817 * other handlers, like nfnetlink_inst can */
818 nf_log_unregister_pf(pf
);
829 UDEBUG("no config command, and no instance for "
830 "group=%u pid=%u =>ENOENT\n",
831 group_num
, NETLINK_CB(skb
).pid
);
836 if (inst
->peer_pid
!= NETLINK_CB(skb
).pid
) {
837 UDEBUG("no config command, and wrong pid\n");
843 if (nfula
[NFULA_CFG_MODE
-1]) {
844 struct nfulnl_msg_config_mode
*params
;
845 params
= NFA_DATA(nfula
[NFULA_CFG_MODE
-1]);
847 nfulnl_set_mode(inst
, params
->copy_mode
,
848 ntohl(params
->copy_range
));
851 if (nfula
[NFULA_CFG_TIMEOUT
-1]) {
853 *(__be32
*)NFA_DATA(nfula
[NFULA_CFG_TIMEOUT
-1]);
855 nfulnl_set_timeout(inst
, ntohl(timeout
));
858 if (nfula
[NFULA_CFG_NLBUFSIZ
-1]) {
860 *(__be32
*)NFA_DATA(nfula
[NFULA_CFG_NLBUFSIZ
-1]);
862 nfulnl_set_nlbufsiz(inst
, ntohl(nlbufsiz
));
865 if (nfula
[NFULA_CFG_QTHRESH
-1]) {
867 *(__be32
*)NFA_DATA(nfula
[NFULA_CFG_QTHRESH
-1]);
869 nfulnl_set_qthresh(inst
, ntohl(qthresh
));
872 if (nfula
[NFULA_CFG_FLAGS
-1]) {
874 *(__be16
*)NFA_DATA(nfula
[NFULA_CFG_FLAGS
-1]);
875 nfulnl_set_flags(inst
, ntohs(flags
));
884 static struct nfnl_callback nfulnl_cb
[NFULNL_MSG_MAX
] = {
885 [NFULNL_MSG_PACKET
] = { .call
= nfulnl_recv_unsupp
,
886 .attr_count
= NFULA_MAX
, },
887 [NFULNL_MSG_CONFIG
] = { .call
= nfulnl_recv_config
,
888 .attr_count
= NFULA_CFG_MAX
, },
891 static struct nfnetlink_subsystem nfulnl_subsys
= {
893 .subsys_id
= NFNL_SUBSYS_ULOG
,
894 .cb_count
= NFULNL_MSG_MAX
,
898 #ifdef CONFIG_PROC_FS
903 static struct hlist_node
*get_first(struct iter_state
*st
)
908 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
909 if (!hlist_empty(&instance_table
[st
->bucket
]))
910 return instance_table
[st
->bucket
].first
;
915 static struct hlist_node
*get_next(struct iter_state
*st
, struct hlist_node
*h
)
919 if (++st
->bucket
>= INSTANCE_BUCKETS
)
922 h
= instance_table
[st
->bucket
].first
;
927 static struct hlist_node
*get_idx(struct iter_state
*st
, loff_t pos
)
929 struct hlist_node
*head
;
930 head
= get_first(st
);
933 while (pos
&& (head
= get_next(st
, head
)))
935 return pos
? NULL
: head
;
938 static void *seq_start(struct seq_file
*seq
, loff_t
*pos
)
940 read_lock_bh(&instances_lock
);
941 return get_idx(seq
->private, *pos
);
944 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
947 return get_next(s
->private, v
);
950 static void seq_stop(struct seq_file
*s
, void *v
)
952 read_unlock_bh(&instances_lock
);
955 static int seq_show(struct seq_file
*s
, void *v
)
957 const struct nfulnl_instance
*inst
= v
;
959 return seq_printf(s
, "%5d %6d %5d %1d %5d %6d %2d\n",
961 inst
->peer_pid
, inst
->qlen
,
962 inst
->copy_mode
, inst
->copy_range
,
963 inst
->flushtimeout
, atomic_read(&inst
->use
));
966 static const struct seq_operations nful_seq_ops
= {
973 static int nful_open(struct inode
*inode
, struct file
*file
)
975 struct seq_file
*seq
;
976 struct iter_state
*is
;
979 is
= kzalloc(sizeof(*is
), GFP_KERNEL
);
982 ret
= seq_open(file
, &nful_seq_ops
);
985 seq
= file
->private_data
;
993 static const struct file_operations nful_file_ops
= {
994 .owner
= THIS_MODULE
,
998 .release
= seq_release_private
,
1001 #endif /* PROC_FS */
1003 static int __init
nfnetlink_log_init(void)
1005 int i
, status
= -ENOMEM
;
1006 #ifdef CONFIG_PROC_FS
1007 struct proc_dir_entry
*proc_nful
;
1010 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
1011 INIT_HLIST_HEAD(&instance_table
[i
]);
1013 /* it's not really all that important to have a random value, so
1014 * we can do this from the init function, even if there hasn't
1015 * been that much entropy yet */
1016 get_random_bytes(&hash_init
, sizeof(hash_init
));
1018 netlink_register_notifier(&nfulnl_rtnl_notifier
);
1019 status
= nfnetlink_subsys_register(&nfulnl_subsys
);
1021 printk(KERN_ERR
"log: failed to create netlink socket\n");
1022 goto cleanup_netlink_notifier
;
1025 #ifdef CONFIG_PROC_FS
1026 proc_nful
= create_proc_entry("nfnetlink_log", 0440,
1027 proc_net_netfilter
);
1029 goto cleanup_subsys
;
1030 proc_nful
->proc_fops
= &nful_file_ops
;
1034 #ifdef CONFIG_PROC_FS
1036 nfnetlink_subsys_unregister(&nfulnl_subsys
);
1038 cleanup_netlink_notifier
:
1039 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
1043 static void __exit
nfnetlink_log_fini(void)
1045 nf_log_unregister(&nfulnl_logger
);
1046 #ifdef CONFIG_PROC_FS
1047 remove_proc_entry("nfnetlink_log", proc_net_netfilter
);
1049 nfnetlink_subsys_unregister(&nfulnl_subsys
);
1050 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
1053 MODULE_DESCRIPTION("netfilter userspace logging");
1054 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1055 MODULE_LICENSE("GPL");
1056 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG
);
1058 module_init(nfnetlink_log_init
);
1059 module_exit(nfnetlink_log_fini
);