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>
31 #include <linux/slab.h>
33 #include <net/netfilter/nf_log.h>
34 #include <net/netfilter/nfnetlink_log.h>
36 #include <linux/atomic.h>
38 #ifdef CONFIG_BRIDGE_NETFILTER
39 #include "../bridge/br_private.h"
42 #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
43 #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
44 #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
45 #define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */
47 #define PRINTR(x, args...) do { if (net_ratelimit()) \
48 printk(x, ## args); } while (0);
50 struct nfulnl_instance
{
51 struct hlist_node hlist
; /* global list of instances */
53 atomic_t use
; /* use count */
55 unsigned int qlen
; /* number of nlmsgs in skb */
56 struct sk_buff
*skb
; /* pre-allocatd skb */
57 struct timer_list timer
;
58 struct user_namespace
*peer_user_ns
; /* User namespace of the peer process */
59 int peer_pid
; /* PID of the peer process */
61 /* configurable parameters */
62 unsigned int flushtimeout
; /* timeout until queue flush */
63 unsigned int nlbufsiz
; /* netlink buffer allocation size */
64 unsigned int qthreshold
; /* threshold of the queue */
66 u_int32_t seq
; /* instance-local sequential counter */
67 u_int16_t group_num
; /* number of this queue */
73 static DEFINE_SPINLOCK(instances_lock
);
74 static atomic_t global_seq
;
76 #define INSTANCE_BUCKETS 16
77 static struct hlist_head instance_table
[INSTANCE_BUCKETS
];
78 static unsigned int hash_init
;
80 static inline u_int8_t
instance_hashfn(u_int16_t group_num
)
82 return ((group_num
& 0xff) % INSTANCE_BUCKETS
);
85 static struct nfulnl_instance
*
86 __instance_lookup(u_int16_t group_num
)
88 struct hlist_head
*head
;
89 struct hlist_node
*pos
;
90 struct nfulnl_instance
*inst
;
92 head
= &instance_table
[instance_hashfn(group_num
)];
93 hlist_for_each_entry_rcu(inst
, pos
, head
, hlist
) {
94 if (inst
->group_num
== group_num
)
101 instance_get(struct nfulnl_instance
*inst
)
103 atomic_inc(&inst
->use
);
106 static struct nfulnl_instance
*
107 instance_lookup_get(u_int16_t group_num
)
109 struct nfulnl_instance
*inst
;
112 inst
= __instance_lookup(group_num
);
113 if (inst
&& !atomic_inc_not_zero(&inst
->use
))
115 rcu_read_unlock_bh();
120 static void nfulnl_instance_free_rcu(struct rcu_head
*head
)
122 kfree(container_of(head
, struct nfulnl_instance
, rcu
));
123 module_put(THIS_MODULE
);
127 instance_put(struct nfulnl_instance
*inst
)
129 if (inst
&& atomic_dec_and_test(&inst
->use
))
130 call_rcu_bh(&inst
->rcu
, nfulnl_instance_free_rcu
);
133 static void nfulnl_timer(unsigned long data
);
135 static struct nfulnl_instance
*
136 instance_create(u_int16_t group_num
, int pid
, struct user_namespace
*user_ns
)
138 struct nfulnl_instance
*inst
;
141 spin_lock_bh(&instances_lock
);
142 if (__instance_lookup(group_num
)) {
147 inst
= kzalloc(sizeof(*inst
), GFP_ATOMIC
);
153 if (!try_module_get(THIS_MODULE
)) {
159 INIT_HLIST_NODE(&inst
->hlist
);
160 spin_lock_init(&inst
->lock
);
161 /* needs to be two, since we _put() after creation */
162 atomic_set(&inst
->use
, 2);
164 setup_timer(&inst
->timer
, nfulnl_timer
, (unsigned long)inst
);
166 inst
->peer_user_ns
= user_ns
;
167 inst
->peer_pid
= pid
;
168 inst
->group_num
= group_num
;
170 inst
->qthreshold
= NFULNL_QTHRESH_DEFAULT
;
171 inst
->flushtimeout
= NFULNL_TIMEOUT_DEFAULT
;
172 inst
->nlbufsiz
= NFULNL_NLBUFSIZ_DEFAULT
;
173 inst
->copy_mode
= NFULNL_COPY_PACKET
;
174 inst
->copy_range
= NFULNL_COPY_RANGE_MAX
;
176 hlist_add_head_rcu(&inst
->hlist
,
177 &instance_table
[instance_hashfn(group_num
)]);
179 spin_unlock_bh(&instances_lock
);
184 spin_unlock_bh(&instances_lock
);
188 static void __nfulnl_flush(struct nfulnl_instance
*inst
);
190 /* called with BH disabled */
192 __instance_destroy(struct nfulnl_instance
*inst
)
194 /* first pull it out of the global list */
195 hlist_del_rcu(&inst
->hlist
);
197 /* then flush all pending packets from skb */
199 spin_lock(&inst
->lock
);
201 /* lockless readers wont be able to use us */
202 inst
->copy_mode
= NFULNL_COPY_DISABLED
;
205 __nfulnl_flush(inst
);
206 spin_unlock(&inst
->lock
);
208 /* and finally put the refcount */
213 instance_destroy(struct nfulnl_instance
*inst
)
215 spin_lock_bh(&instances_lock
);
216 __instance_destroy(inst
);
217 spin_unlock_bh(&instances_lock
);
221 nfulnl_set_mode(struct nfulnl_instance
*inst
, u_int8_t mode
,
226 spin_lock_bh(&inst
->lock
);
229 case NFULNL_COPY_NONE
:
230 case NFULNL_COPY_META
:
231 inst
->copy_mode
= mode
;
232 inst
->copy_range
= 0;
235 case NFULNL_COPY_PACKET
:
236 inst
->copy_mode
= mode
;
237 inst
->copy_range
= min_t(unsigned int,
238 range
, NFULNL_COPY_RANGE_MAX
);
246 spin_unlock_bh(&inst
->lock
);
252 nfulnl_set_nlbufsiz(struct nfulnl_instance
*inst
, u_int32_t nlbufsiz
)
256 spin_lock_bh(&inst
->lock
);
257 if (nlbufsiz
< NFULNL_NLBUFSIZ_DEFAULT
)
259 else if (nlbufsiz
> 131072)
262 inst
->nlbufsiz
= nlbufsiz
;
265 spin_unlock_bh(&inst
->lock
);
271 nfulnl_set_timeout(struct nfulnl_instance
*inst
, u_int32_t timeout
)
273 spin_lock_bh(&inst
->lock
);
274 inst
->flushtimeout
= timeout
;
275 spin_unlock_bh(&inst
->lock
);
281 nfulnl_set_qthresh(struct nfulnl_instance
*inst
, u_int32_t qthresh
)
283 spin_lock_bh(&inst
->lock
);
284 inst
->qthreshold
= qthresh
;
285 spin_unlock_bh(&inst
->lock
);
291 nfulnl_set_flags(struct nfulnl_instance
*inst
, u_int16_t flags
)
293 spin_lock_bh(&inst
->lock
);
295 spin_unlock_bh(&inst
->lock
);
300 static struct sk_buff
*
301 nfulnl_alloc_skb(unsigned int inst_size
, unsigned int pkt_size
)
306 /* alloc skb which should be big enough for a whole multipart
307 * message. WARNING: has to be <= 128k due to slab restrictions */
309 n
= max(inst_size
, pkt_size
);
310 skb
= alloc_skb(n
, GFP_ATOMIC
);
313 /* try to allocate only as much as we need for current
316 skb
= alloc_skb(pkt_size
, GFP_ATOMIC
);
318 pr_err("nfnetlink_log: can't even alloc %u bytes\n",
327 __nfulnl_send(struct nfulnl_instance
*inst
)
331 if (inst
->qlen
> 1) {
332 struct nlmsghdr
*nlh
= nlmsg_put(inst
->skb
, 0, 0,
334 sizeof(struct nfgenmsg
),
339 status
= nfnetlink_unicast(inst
->skb
, &init_net
, inst
->peer_pid
,
349 __nfulnl_flush(struct nfulnl_instance
*inst
)
351 /* timer holds a reference */
352 if (del_timer(&inst
->timer
))
359 nfulnl_timer(unsigned long data
)
361 struct nfulnl_instance
*inst
= (struct nfulnl_instance
*)data
;
363 spin_lock_bh(&inst
->lock
);
366 spin_unlock_bh(&inst
->lock
);
370 /* This is an inline function, we don't really care about a long
371 * list of arguments */
373 __build_packet_message(struct nfulnl_instance
*inst
,
374 const struct sk_buff
*skb
,
375 unsigned int data_len
,
377 unsigned int hooknum
,
378 const struct net_device
*indev
,
379 const struct net_device
*outdev
,
380 const char *prefix
, unsigned int plen
)
382 struct nfulnl_msg_packet_hdr pmsg
;
383 struct nlmsghdr
*nlh
;
384 struct nfgenmsg
*nfmsg
;
385 sk_buff_data_t old_tail
= inst
->skb
->tail
;
387 nlh
= nlmsg_put(inst
->skb
, 0, 0,
388 NFNL_SUBSYS_ULOG
<< 8 | NFULNL_MSG_PACKET
,
389 sizeof(struct nfgenmsg
), 0);
392 nfmsg
= nlmsg_data(nlh
);
393 nfmsg
->nfgen_family
= pf
;
394 nfmsg
->version
= NFNETLINK_V0
;
395 nfmsg
->res_id
= htons(inst
->group_num
);
397 pmsg
.hw_protocol
= skb
->protocol
;
400 if (nla_put(inst
->skb
, NFULA_PACKET_HDR
, sizeof(pmsg
), &pmsg
))
401 goto nla_put_failure
;
404 nla_put(inst
->skb
, NFULA_PREFIX
, plen
, prefix
))
405 goto nla_put_failure
;
408 #ifndef CONFIG_BRIDGE_NETFILTER
409 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_INDEV
,
410 htonl(indev
->ifindex
)))
411 goto nla_put_failure
;
413 if (pf
== PF_BRIDGE
) {
414 /* Case 1: outdev is physical input device, we need to
415 * look for bridge group (when called from
416 * netfilter_bridge) */
417 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_PHYSINDEV
,
418 htonl(indev
->ifindex
)) ||
419 /* this is the bridge group "brX" */
420 /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
421 nla_put_be32(inst
->skb
, NFULA_IFINDEX_INDEV
,
422 htonl(br_port_get_rcu(indev
)->br
->dev
->ifindex
)))
423 goto nla_put_failure
;
425 /* Case 2: indev is bridge group, we need to look for
426 * physical device (when called from ipv4) */
427 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_INDEV
,
428 htonl(indev
->ifindex
)))
429 goto nla_put_failure
;
430 if (skb
->nf_bridge
&& skb
->nf_bridge
->physindev
&&
431 nla_put_be32(inst
->skb
, NFULA_IFINDEX_PHYSINDEV
,
432 htonl(skb
->nf_bridge
->physindev
->ifindex
)))
433 goto nla_put_failure
;
439 #ifndef CONFIG_BRIDGE_NETFILTER
440 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
441 htonl(outdev
->ifindex
)))
442 goto nla_put_failure
;
444 if (pf
== PF_BRIDGE
) {
445 /* Case 1: outdev is physical output device, we need to
446 * look for bridge group (when called from
447 * netfilter_bridge) */
448 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
449 htonl(outdev
->ifindex
)) ||
450 /* this is the bridge group "brX" */
451 /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
452 nla_put_be32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
453 htonl(br_port_get_rcu(outdev
)->br
->dev
->ifindex
)))
454 goto nla_put_failure
;
456 /* Case 2: indev is a bridge group, we need to look
457 * for physical device (when called from ipv4) */
458 if (nla_put_be32(inst
->skb
, NFULA_IFINDEX_OUTDEV
,
459 htonl(outdev
->ifindex
)))
460 goto nla_put_failure
;
461 if (skb
->nf_bridge
&& skb
->nf_bridge
->physoutdev
&&
462 nla_put_be32(inst
->skb
, NFULA_IFINDEX_PHYSOUTDEV
,
463 htonl(skb
->nf_bridge
->physoutdev
->ifindex
)))
464 goto nla_put_failure
;
470 nla_put_be32(inst
->skb
, NFULA_MARK
, htonl(skb
->mark
)))
471 goto nla_put_failure
;
473 if (indev
&& skb
->dev
&&
474 skb
->mac_header
!= skb
->network_header
) {
475 struct nfulnl_msg_packet_hw phw
;
476 int len
= dev_parse_header(skb
, phw
.hw_addr
);
478 phw
.hw_addrlen
= htons(len
);
479 if (nla_put(inst
->skb
, NFULA_HWADDR
, sizeof(phw
), &phw
))
480 goto nla_put_failure
;
484 if (indev
&& skb_mac_header_was_set(skb
)) {
485 if (nla_put_be32(inst
->skb
, NFULA_HWTYPE
, htons(skb
->dev
->type
)) ||
486 nla_put_be16(inst
->skb
, NFULA_HWLEN
,
487 htons(skb
->dev
->hard_header_len
)) ||
488 nla_put(inst
->skb
, NFULA_HWHEADER
, skb
->dev
->hard_header_len
,
489 skb_mac_header(skb
)))
490 goto nla_put_failure
;
493 if (skb
->tstamp
.tv64
) {
494 struct nfulnl_msg_packet_timestamp ts
;
495 struct timeval tv
= ktime_to_timeval(skb
->tstamp
);
496 ts
.sec
= cpu_to_be64(tv
.tv_sec
);
497 ts
.usec
= cpu_to_be64(tv
.tv_usec
);
499 if (nla_put(inst
->skb
, NFULA_TIMESTAMP
, sizeof(ts
), &ts
))
500 goto nla_put_failure
;
505 read_lock_bh(&skb
->sk
->sk_callback_lock
);
506 if (skb
->sk
->sk_socket
&& skb
->sk
->sk_socket
->file
) {
507 struct file
*file
= skb
->sk
->sk_socket
->file
;
508 __be32 uid
= htonl(from_kuid_munged(inst
->peer_user_ns
,
509 file
->f_cred
->fsuid
));
510 __be32 gid
= htonl(from_kgid_munged(inst
->peer_user_ns
,
511 file
->f_cred
->fsgid
));
512 /* need to unlock here since NLA_PUT may goto */
513 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
514 if (nla_put_be32(inst
->skb
, NFULA_UID
, uid
) ||
515 nla_put_be32(inst
->skb
, NFULA_GID
, gid
))
516 goto nla_put_failure
;
518 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
521 /* local sequence number */
522 if ((inst
->flags
& NFULNL_CFG_F_SEQ
) &&
523 nla_put_be32(inst
->skb
, NFULA_SEQ
, htonl(inst
->seq
++)))
524 goto nla_put_failure
;
526 /* global sequence number */
527 if ((inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
) &&
528 nla_put_be32(inst
->skb
, NFULA_SEQ_GLOBAL
,
529 htonl(atomic_inc_return(&global_seq
))))
530 goto nla_put_failure
;
534 int size
= nla_attr_size(data_len
);
536 if (skb_tailroom(inst
->skb
) < nla_total_size(data_len
)) {
537 printk(KERN_WARNING
"nfnetlink_log: no tailroom!\n");
541 nla
= (struct nlattr
*)skb_put(inst
->skb
, nla_total_size(data_len
));
542 nla
->nla_type
= NFULA_PAYLOAD
;
545 if (skb_copy_bits(skb
, 0, nla_data(nla
), data_len
))
549 nlh
->nlmsg_len
= inst
->skb
->tail
- old_tail
;
553 PRINTR(KERN_ERR
"nfnetlink_log: error creating log nlmsg\n");
557 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
559 static struct nf_loginfo default_loginfo
= {
560 .type
= NF_LOG_TYPE_ULOG
,
570 /* log handler for internal netfilter logging api */
572 nfulnl_log_packet(u_int8_t pf
,
573 unsigned int hooknum
,
574 const struct sk_buff
*skb
,
575 const struct net_device
*in
,
576 const struct net_device
*out
,
577 const struct nf_loginfo
*li_user
,
580 unsigned int size
, data_len
;
581 struct nfulnl_instance
*inst
;
582 const struct nf_loginfo
*li
;
583 unsigned int qthreshold
;
586 if (li_user
&& li_user
->type
== NF_LOG_TYPE_ULOG
)
589 li
= &default_loginfo
;
591 inst
= instance_lookup_get(li
->u
.ulog
.group
);
597 plen
= strlen(prefix
) + 1;
599 /* FIXME: do we want to make the size calculation conditional based on
600 * what is actually present? way more branches and checks, but more
601 * memory efficient... */
602 size
= NLMSG_SPACE(sizeof(struct nfgenmsg
))
603 + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr
))
604 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
605 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
606 #ifdef CONFIG_BRIDGE_NETFILTER
607 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
608 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
610 + nla_total_size(sizeof(u_int32_t
)) /* mark */
611 + nla_total_size(sizeof(u_int32_t
)) /* uid */
612 + nla_total_size(sizeof(u_int32_t
)) /* gid */
613 + nla_total_size(plen
) /* prefix */
614 + nla_total_size(sizeof(struct nfulnl_msg_packet_hw
))
615 + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp
));
617 if (in
&& skb_mac_header_was_set(skb
)) {
618 size
+= nla_total_size(skb
->dev
->hard_header_len
)
619 + nla_total_size(sizeof(u_int16_t
)) /* hwtype */
620 + nla_total_size(sizeof(u_int16_t
)); /* hwlen */
623 spin_lock_bh(&inst
->lock
);
625 if (inst
->flags
& NFULNL_CFG_F_SEQ
)
626 size
+= nla_total_size(sizeof(u_int32_t
));
627 if (inst
->flags
& NFULNL_CFG_F_SEQ_GLOBAL
)
628 size
+= nla_total_size(sizeof(u_int32_t
));
630 qthreshold
= inst
->qthreshold
;
631 /* per-rule qthreshold overrides per-instance */
632 if (li
->u
.ulog
.qthreshold
)
633 if (qthreshold
> li
->u
.ulog
.qthreshold
)
634 qthreshold
= li
->u
.ulog
.qthreshold
;
637 switch (inst
->copy_mode
) {
638 case NFULNL_COPY_META
:
639 case NFULNL_COPY_NONE
:
643 case NFULNL_COPY_PACKET
:
644 if (inst
->copy_range
== 0
645 || inst
->copy_range
> skb
->len
)
648 data_len
= inst
->copy_range
;
650 size
+= nla_total_size(data_len
);
653 case NFULNL_COPY_DISABLED
:
655 goto unlock_and_release
;
659 size
> skb_tailroom(inst
->skb
) - sizeof(struct nfgenmsg
)) {
660 /* either the queue len is too high or we don't have
661 * enough room in the skb left. flush to userspace. */
662 __nfulnl_flush(inst
);
666 inst
->skb
= nfulnl_alloc_skb(inst
->nlbufsiz
, size
);
673 __build_packet_message(inst
, skb
, data_len
, pf
,
674 hooknum
, in
, out
, prefix
, plen
);
676 if (inst
->qlen
>= qthreshold
)
677 __nfulnl_flush(inst
);
678 /* timer_pending always called within inst->lock, so there
679 * is no chance of a race here */
680 else if (!timer_pending(&inst
->timer
)) {
682 inst
->timer
.expires
= jiffies
+ (inst
->flushtimeout
*HZ
/100);
683 add_timer(&inst
->timer
);
687 spin_unlock_bh(&inst
->lock
);
692 /* FIXME: statistics */
693 goto unlock_and_release
;
695 EXPORT_SYMBOL_GPL(nfulnl_log_packet
);
698 nfulnl_rcv_nl_event(struct notifier_block
*this,
699 unsigned long event
, void *ptr
)
701 struct netlink_notify
*n
= ptr
;
703 if (event
== NETLINK_URELEASE
&& n
->protocol
== NETLINK_NETFILTER
) {
706 /* destroy all instances for this pid */
707 spin_lock_bh(&instances_lock
);
708 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
709 struct hlist_node
*tmp
, *t2
;
710 struct nfulnl_instance
*inst
;
711 struct hlist_head
*head
= &instance_table
[i
];
713 hlist_for_each_entry_safe(inst
, tmp
, t2
, head
, hlist
) {
714 if ((net_eq(n
->net
, &init_net
)) &&
715 (n
->pid
== inst
->peer_pid
))
716 __instance_destroy(inst
);
719 spin_unlock_bh(&instances_lock
);
724 static struct notifier_block nfulnl_rtnl_notifier
= {
725 .notifier_call
= nfulnl_rcv_nl_event
,
729 nfulnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
730 const struct nlmsghdr
*nlh
,
731 const struct nlattr
* const nfqa
[])
736 static struct nf_logger nfulnl_logger __read_mostly
= {
737 .name
= "nfnetlink_log",
738 .logfn
= &nfulnl_log_packet
,
742 static const struct nla_policy nfula_cfg_policy
[NFULA_CFG_MAX
+1] = {
743 [NFULA_CFG_CMD
] = { .len
= sizeof(struct nfulnl_msg_config_cmd
) },
744 [NFULA_CFG_MODE
] = { .len
= sizeof(struct nfulnl_msg_config_mode
) },
745 [NFULA_CFG_TIMEOUT
] = { .type
= NLA_U32
},
746 [NFULA_CFG_QTHRESH
] = { .type
= NLA_U32
},
747 [NFULA_CFG_NLBUFSIZ
] = { .type
= NLA_U32
},
748 [NFULA_CFG_FLAGS
] = { .type
= NLA_U16
},
752 nfulnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
753 const struct nlmsghdr
*nlh
,
754 const struct nlattr
* const nfula
[])
756 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
757 u_int16_t group_num
= ntohs(nfmsg
->res_id
);
758 struct nfulnl_instance
*inst
;
759 struct nfulnl_msg_config_cmd
*cmd
= NULL
;
762 if (nfula
[NFULA_CFG_CMD
]) {
763 u_int8_t pf
= nfmsg
->nfgen_family
;
764 cmd
= nla_data(nfula
[NFULA_CFG_CMD
]);
766 /* Commands without queue context */
767 switch (cmd
->command
) {
768 case NFULNL_CFG_CMD_PF_BIND
:
769 return nf_log_bind_pf(pf
, &nfulnl_logger
);
770 case NFULNL_CFG_CMD_PF_UNBIND
:
771 nf_log_unbind_pf(pf
);
776 inst
= instance_lookup_get(group_num
);
777 if (inst
&& inst
->peer_pid
!= NETLINK_CB(skb
).pid
) {
783 switch (cmd
->command
) {
784 case NFULNL_CFG_CMD_BIND
:
790 inst
= instance_create(group_num
,
792 sk_user_ns(NETLINK_CB(skb
).ssk
));
798 case NFULNL_CFG_CMD_UNBIND
:
804 instance_destroy(inst
);
812 if (nfula
[NFULA_CFG_MODE
]) {
813 struct nfulnl_msg_config_mode
*params
;
814 params
= nla_data(nfula
[NFULA_CFG_MODE
]);
820 nfulnl_set_mode(inst
, params
->copy_mode
,
821 ntohl(params
->copy_range
));
824 if (nfula
[NFULA_CFG_TIMEOUT
]) {
825 __be32 timeout
= nla_get_be32(nfula
[NFULA_CFG_TIMEOUT
]);
831 nfulnl_set_timeout(inst
, ntohl(timeout
));
834 if (nfula
[NFULA_CFG_NLBUFSIZ
]) {
835 __be32 nlbufsiz
= nla_get_be32(nfula
[NFULA_CFG_NLBUFSIZ
]);
841 nfulnl_set_nlbufsiz(inst
, ntohl(nlbufsiz
));
844 if (nfula
[NFULA_CFG_QTHRESH
]) {
845 __be32 qthresh
= nla_get_be32(nfula
[NFULA_CFG_QTHRESH
]);
851 nfulnl_set_qthresh(inst
, ntohl(qthresh
));
854 if (nfula
[NFULA_CFG_FLAGS
]) {
855 __be16 flags
= nla_get_be16(nfula
[NFULA_CFG_FLAGS
]);
861 nfulnl_set_flags(inst
, ntohs(flags
));
870 static const struct nfnl_callback nfulnl_cb
[NFULNL_MSG_MAX
] = {
871 [NFULNL_MSG_PACKET
] = { .call
= nfulnl_recv_unsupp
,
872 .attr_count
= NFULA_MAX
, },
873 [NFULNL_MSG_CONFIG
] = { .call
= nfulnl_recv_config
,
874 .attr_count
= NFULA_CFG_MAX
,
875 .policy
= nfula_cfg_policy
},
878 static const struct nfnetlink_subsystem nfulnl_subsys
= {
880 .subsys_id
= NFNL_SUBSYS_ULOG
,
881 .cb_count
= NFULNL_MSG_MAX
,
885 #ifdef CONFIG_PROC_FS
890 static struct hlist_node
*get_first(struct iter_state
*st
)
895 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
896 if (!hlist_empty(&instance_table
[st
->bucket
]))
897 return rcu_dereference_bh(hlist_first_rcu(&instance_table
[st
->bucket
]));
902 static struct hlist_node
*get_next(struct iter_state
*st
, struct hlist_node
*h
)
904 h
= rcu_dereference_bh(hlist_next_rcu(h
));
906 if (++st
->bucket
>= INSTANCE_BUCKETS
)
909 h
= rcu_dereference_bh(hlist_first_rcu(&instance_table
[st
->bucket
]));
914 static struct hlist_node
*get_idx(struct iter_state
*st
, loff_t pos
)
916 struct hlist_node
*head
;
917 head
= get_first(st
);
920 while (pos
&& (head
= get_next(st
, head
)))
922 return pos
? NULL
: head
;
925 static void *seq_start(struct seq_file
*seq
, loff_t
*pos
)
929 return get_idx(seq
->private, *pos
);
932 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
935 return get_next(s
->private, v
);
938 static void seq_stop(struct seq_file
*s
, void *v
)
941 rcu_read_unlock_bh();
944 static int seq_show(struct seq_file
*s
, void *v
)
946 const struct nfulnl_instance
*inst
= v
;
948 return seq_printf(s
, "%5d %6d %5d %1d %5d %6d %2d\n",
950 inst
->peer_pid
, inst
->qlen
,
951 inst
->copy_mode
, inst
->copy_range
,
952 inst
->flushtimeout
, atomic_read(&inst
->use
));
955 static const struct seq_operations nful_seq_ops
= {
962 static int nful_open(struct inode
*inode
, struct file
*file
)
964 return seq_open_private(file
, &nful_seq_ops
,
965 sizeof(struct iter_state
));
968 static const struct file_operations nful_file_ops
= {
969 .owner
= THIS_MODULE
,
973 .release
= seq_release_private
,
978 static int __init
nfnetlink_log_init(void)
980 int i
, status
= -ENOMEM
;
982 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
983 INIT_HLIST_HEAD(&instance_table
[i
]);
985 /* it's not really all that important to have a random value, so
986 * we can do this from the init function, even if there hasn't
987 * been that much entropy yet */
988 get_random_bytes(&hash_init
, sizeof(hash_init
));
990 netlink_register_notifier(&nfulnl_rtnl_notifier
);
991 status
= nfnetlink_subsys_register(&nfulnl_subsys
);
993 printk(KERN_ERR
"log: failed to create netlink socket\n");
994 goto cleanup_netlink_notifier
;
997 status
= nf_log_register(NFPROTO_UNSPEC
, &nfulnl_logger
);
999 printk(KERN_ERR
"log: failed to register logger\n");
1000 goto cleanup_subsys
;
1003 #ifdef CONFIG_PROC_FS
1004 if (!proc_create("nfnetlink_log", 0440,
1005 proc_net_netfilter
, &nful_file_ops
))
1006 goto cleanup_logger
;
1010 #ifdef CONFIG_PROC_FS
1012 nf_log_unregister(&nfulnl_logger
);
1015 nfnetlink_subsys_unregister(&nfulnl_subsys
);
1016 cleanup_netlink_notifier
:
1017 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
1021 static void __exit
nfnetlink_log_fini(void)
1023 nf_log_unregister(&nfulnl_logger
);
1024 #ifdef CONFIG_PROC_FS
1025 remove_proc_entry("nfnetlink_log", proc_net_netfilter
);
1027 nfnetlink_subsys_unregister(&nfulnl_subsys
);
1028 netlink_unregister_notifier(&nfulnl_rtnl_notifier
);
1031 MODULE_DESCRIPTION("netfilter userspace logging");
1032 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1033 MODULE_LICENSE("GPL");
1034 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG
);
1036 module_init(nfnetlink_log_init
);
1037 module_exit(nfnetlink_log_fini
);