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Commit | Line | Data |
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0597f268 HW |
1 | /* |
2 | * This is a module which is used for logging packets to userspace via | |
3 | * nfetlink. | |
4 | * | |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
6 | * | |
7 | * Based on the old ipv4-only ipt_ULOG.c: | |
8 | * (C) 2000-2004 by Harald Welte <laforge@netfilter.org> | |
9 | * | |
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. | |
13 | * | |
0af5f6c1 HW |
14 | * 2006-01-26 Harald Welte <laforge@netfilter.org> |
15 | * - Add optional local and global sequence number to detect lost | |
16 | * events from userspace | |
17 | * | |
0597f268 HW |
18 | */ |
19 | #include <linux/module.h> | |
20 | #include <linux/skbuff.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/ip.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> | |
36 | #include <net/sock.h> | |
37 | ||
38 | #include <asm/atomic.h> | |
39 | ||
fbcd923c HW |
40 | #ifdef CONFIG_BRIDGE_NETFILTER |
41 | #include "../bridge/br_private.h" | |
42 | #endif | |
43 | ||
c2db2924 | 44 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
0597f268 HW |
45 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
46 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ | |
47 | ||
48 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
49 | printk(x, ## args); } while (0); | |
50 | ||
51 | #if 0 | |
52 | #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \ | |
53 | __FILE__, __LINE__, __FUNCTION__, \ | |
54 | ## args) | |
55 | #else | |
56 | #define UDEBUG(x, ...) | |
57 | #endif | |
58 | ||
59 | struct nfulnl_instance { | |
60 | struct hlist_node hlist; /* global list of instances */ | |
61 | spinlock_t lock; | |
62 | atomic_t use; /* use count */ | |
63 | ||
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 */ | |
69 | ||
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 */ | |
74 | u_int32_t copy_range; | |
0af5f6c1 | 75 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 76 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 77 | u_int16_t flags; |
601e68e1 | 78 | u_int8_t copy_mode; |
0597f268 HW |
79 | }; |
80 | ||
81 | static DEFINE_RWLOCK(instances_lock); | |
0af5f6c1 | 82 | static atomic_t global_seq; |
0597f268 HW |
83 | |
84 | #define INSTANCE_BUCKETS 16 | |
85 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
86 | static unsigned int hash_init; | |
87 | ||
88 | static inline u_int8_t instance_hashfn(u_int16_t group_num) | |
89 | { | |
90 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
91 | } | |
92 | ||
93 | static struct nfulnl_instance * | |
94 | __instance_lookup(u_int16_t group_num) | |
95 | { | |
96 | struct hlist_head *head; | |
97 | struct hlist_node *pos; | |
98 | struct nfulnl_instance *inst; | |
99 | ||
100 | UDEBUG("entering (group_num=%u)\n", group_num); | |
101 | ||
102 | head = &instance_table[instance_hashfn(group_num)]; | |
103 | hlist_for_each_entry(inst, pos, head, hlist) { | |
104 | if (inst->group_num == group_num) | |
105 | return inst; | |
106 | } | |
107 | return NULL; | |
108 | } | |
109 | ||
110 | static inline void | |
111 | instance_get(struct nfulnl_instance *inst) | |
112 | { | |
113 | atomic_inc(&inst->use); | |
114 | } | |
115 | ||
116 | static struct nfulnl_instance * | |
117 | instance_lookup_get(u_int16_t group_num) | |
118 | { | |
119 | struct nfulnl_instance *inst; | |
120 | ||
121 | read_lock_bh(&instances_lock); | |
122 | inst = __instance_lookup(group_num); | |
123 | if (inst) | |
124 | instance_get(inst); | |
125 | read_unlock_bh(&instances_lock); | |
126 | ||
127 | return inst; | |
128 | } | |
129 | ||
130 | static void | |
131 | instance_put(struct nfulnl_instance *inst) | |
132 | { | |
133 | if (inst && atomic_dec_and_test(&inst->use)) { | |
134 | UDEBUG("kfree(inst=%p)\n", inst); | |
135 | kfree(inst); | |
136 | } | |
137 | } | |
138 | ||
139 | static void nfulnl_timer(unsigned long data); | |
140 | ||
141 | static struct nfulnl_instance * | |
142 | instance_create(u_int16_t group_num, int pid) | |
143 | { | |
144 | struct nfulnl_instance *inst; | |
145 | ||
146 | UDEBUG("entering (group_num=%u, pid=%d)\n", group_num, | |
147 | pid); | |
148 | ||
601e68e1 | 149 | write_lock_bh(&instances_lock); |
0597f268 HW |
150 | if (__instance_lookup(group_num)) { |
151 | inst = NULL; | |
152 | UDEBUG("aborting, instance already exists\n"); | |
153 | goto out_unlock; | |
154 | } | |
155 | ||
10dfdc69 | 156 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
0597f268 HW |
157 | if (!inst) |
158 | goto out_unlock; | |
159 | ||
0597f268 | 160 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 161 | spin_lock_init(&inst->lock); |
0597f268 HW |
162 | /* needs to be two, since we _put() after creation */ |
163 | atomic_set(&inst->use, 2); | |
164 | ||
165 | init_timer(&inst->timer); | |
166 | inst->timer.function = nfulnl_timer; | |
167 | inst->timer.data = (unsigned long)inst; | |
168 | /* don't start timer yet. (re)start it with every packet */ | |
169 | ||
170 | inst->peer_pid = pid; | |
171 | inst->group_num = group_num; | |
172 | ||
173 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
174 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
175 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
176 | inst->copy_mode = NFULNL_COPY_PACKET; | |
177 | inst->copy_range = 0xffff; | |
178 | ||
179 | if (!try_module_get(THIS_MODULE)) | |
180 | goto out_free; | |
181 | ||
601e68e1 | 182 | hlist_add_head(&inst->hlist, |
0597f268 HW |
183 | &instance_table[instance_hashfn(group_num)]); |
184 | ||
601e68e1 | 185 | UDEBUG("newly added node: %p, next=%p\n", &inst->hlist, |
0597f268 HW |
186 | inst->hlist.next); |
187 | ||
188 | write_unlock_bh(&instances_lock); | |
189 | ||
190 | return inst; | |
191 | ||
192 | out_free: | |
193 | instance_put(inst); | |
194 | out_unlock: | |
195 | write_unlock_bh(&instances_lock); | |
196 | return NULL; | |
197 | } | |
198 | ||
199 | static int __nfulnl_send(struct nfulnl_instance *inst); | |
200 | ||
201 | static void | |
202 | _instance_destroy2(struct nfulnl_instance *inst, int lock) | |
203 | { | |
204 | /* first pull it out of the global list */ | |
205 | if (lock) | |
206 | write_lock_bh(&instances_lock); | |
207 | ||
208 | UDEBUG("removing instance %p (queuenum=%u) from hash\n", | |
209 | inst, inst->group_num); | |
210 | ||
211 | hlist_del(&inst->hlist); | |
212 | ||
213 | if (lock) | |
214 | write_unlock_bh(&instances_lock); | |
215 | ||
216 | /* then flush all pending packets from skb */ | |
217 | ||
218 | spin_lock_bh(&inst->lock); | |
219 | if (inst->skb) { | |
220 | if (inst->qlen) | |
221 | __nfulnl_send(inst); | |
222 | if (inst->skb) { | |
223 | kfree_skb(inst->skb); | |
224 | inst->skb = NULL; | |
225 | } | |
226 | } | |
227 | spin_unlock_bh(&inst->lock); | |
228 | ||
229 | /* and finally put the refcount */ | |
230 | instance_put(inst); | |
231 | ||
232 | module_put(THIS_MODULE); | |
233 | } | |
234 | ||
235 | static inline void | |
236 | __instance_destroy(struct nfulnl_instance *inst) | |
237 | { | |
238 | _instance_destroy2(inst, 0); | |
239 | } | |
240 | ||
241 | static inline void | |
242 | instance_destroy(struct nfulnl_instance *inst) | |
243 | { | |
244 | _instance_destroy2(inst, 1); | |
245 | } | |
246 | ||
247 | static int | |
248 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
249 | unsigned int range) | |
250 | { | |
251 | int status = 0; | |
252 | ||
253 | spin_lock_bh(&inst->lock); | |
601e68e1 | 254 | |
0597f268 HW |
255 | switch (mode) { |
256 | case NFULNL_COPY_NONE: | |
257 | case NFULNL_COPY_META: | |
258 | inst->copy_mode = mode; | |
259 | inst->copy_range = 0; | |
260 | break; | |
601e68e1 | 261 | |
0597f268 HW |
262 | case NFULNL_COPY_PACKET: |
263 | inst->copy_mode = mode; | |
264 | /* we're using struct nfattr which has 16bit nfa_len */ | |
265 | if (range > 0xffff) | |
266 | inst->copy_range = 0xffff; | |
267 | else | |
268 | inst->copy_range = range; | |
269 | break; | |
601e68e1 | 270 | |
0597f268 HW |
271 | default: |
272 | status = -EINVAL; | |
273 | break; | |
274 | } | |
275 | ||
276 | spin_unlock_bh(&inst->lock); | |
277 | ||
278 | return status; | |
279 | } | |
280 | ||
281 | static int | |
282 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
283 | { | |
284 | int status; | |
285 | ||
286 | spin_lock_bh(&inst->lock); | |
287 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
288 | status = -ERANGE; | |
289 | else if (nlbufsiz > 131072) | |
290 | status = -ERANGE; | |
291 | else { | |
292 | inst->nlbufsiz = nlbufsiz; | |
293 | status = 0; | |
294 | } | |
295 | spin_unlock_bh(&inst->lock); | |
296 | ||
297 | return status; | |
298 | } | |
299 | ||
300 | static int | |
301 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
302 | { | |
303 | spin_lock_bh(&inst->lock); | |
304 | inst->flushtimeout = timeout; | |
305 | spin_unlock_bh(&inst->lock); | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static int | |
311 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
312 | { | |
313 | spin_lock_bh(&inst->lock); | |
314 | inst->qthreshold = qthresh; | |
315 | spin_unlock_bh(&inst->lock); | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
0af5f6c1 HW |
320 | static int |
321 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
322 | { | |
323 | spin_lock_bh(&inst->lock); | |
ee433530 | 324 | inst->flags = flags; |
0af5f6c1 HW |
325 | spin_unlock_bh(&inst->lock); |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
601e68e1 | 330 | static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size, |
0597f268 HW |
331 | unsigned int pkt_size) |
332 | { | |
333 | struct sk_buff *skb; | |
ad2ad0f9 | 334 | unsigned int n; |
0597f268 HW |
335 | |
336 | UDEBUG("entered (%u, %u)\n", inst_size, pkt_size); | |
337 | ||
338 | /* alloc skb which should be big enough for a whole multipart | |
339 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
340 | ||
ad2ad0f9 PM |
341 | n = max(inst_size, pkt_size); |
342 | skb = alloc_skb(n, GFP_ATOMIC); | |
0597f268 HW |
343 | if (!skb) { |
344 | PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n", | |
345 | inst_size); | |
346 | ||
ad2ad0f9 PM |
347 | if (n > pkt_size) { |
348 | /* try to allocate only as much as we need for current | |
349 | * packet */ | |
0597f268 | 350 | |
ad2ad0f9 PM |
351 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
352 | if (!skb) | |
353 | PRINTR("nfnetlink_log: can't even alloc %u " | |
354 | "bytes\n", pkt_size); | |
355 | } | |
0597f268 HW |
356 | } |
357 | ||
358 | return skb; | |
359 | } | |
360 | ||
361 | static int | |
362 | __nfulnl_send(struct nfulnl_instance *inst) | |
363 | { | |
364 | int status; | |
365 | ||
366 | if (timer_pending(&inst->timer)) | |
367 | del_timer(&inst->timer); | |
368 | ||
dcb7cd97 MH |
369 | if (!inst->skb) |
370 | return 0; | |
371 | ||
0597f268 HW |
372 | if (inst->qlen > 1) |
373 | inst->lastnlh->nlmsg_type = NLMSG_DONE; | |
374 | ||
375 | status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT); | |
376 | if (status < 0) { | |
377 | UDEBUG("netlink_unicast() failed\n"); | |
378 | /* FIXME: statistics */ | |
379 | } | |
380 | ||
381 | inst->qlen = 0; | |
382 | inst->skb = NULL; | |
383 | inst->lastnlh = NULL; | |
384 | ||
385 | return status; | |
386 | } | |
387 | ||
388 | static void nfulnl_timer(unsigned long data) | |
389 | { | |
601e68e1 | 390 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 HW |
391 | |
392 | UDEBUG("timer function called, flushing buffer\n"); | |
393 | ||
394 | spin_lock_bh(&inst->lock); | |
395 | __nfulnl_send(inst); | |
0597f268 | 396 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 397 | instance_put(inst); |
0597f268 HW |
398 | } |
399 | ||
0af5f6c1 HW |
400 | /* This is an inline function, we don't really care about a long |
401 | * list of arguments */ | |
601e68e1 | 402 | static inline int |
0597f268 | 403 | __build_packet_message(struct nfulnl_instance *inst, |
601e68e1 | 404 | const struct sk_buff *skb, |
0597f268 HW |
405 | unsigned int data_len, |
406 | unsigned int pf, | |
407 | unsigned int hooknum, | |
408 | const struct net_device *indev, | |
409 | const struct net_device *outdev, | |
410 | const struct nf_loginfo *li, | |
d7a5c324 | 411 | const char *prefix, unsigned int plen) |
0597f268 HW |
412 | { |
413 | unsigned char *old_tail; | |
414 | struct nfulnl_msg_packet_hdr pmsg; | |
415 | struct nlmsghdr *nlh; | |
416 | struct nfgenmsg *nfmsg; | |
98a4a861 | 417 | __be32 tmp_uint; |
0597f268 HW |
418 | |
419 | UDEBUG("entered\n"); | |
601e68e1 | 420 | |
0597f268 | 421 | old_tail = inst->skb->tail; |
601e68e1 | 422 | nlh = NLMSG_PUT(inst->skb, 0, 0, |
0597f268 HW |
423 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
424 | sizeof(struct nfgenmsg)); | |
425 | nfmsg = NLMSG_DATA(nlh); | |
426 | nfmsg->nfgen_family = pf; | |
427 | nfmsg->version = NFNETLINK_V0; | |
428 | nfmsg->res_id = htons(inst->group_num); | |
429 | ||
febf0a43 | 430 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
431 | pmsg.hook = hooknum; |
432 | ||
433 | NFA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg); | |
434 | ||
d7a5c324 PM |
435 | if (prefix) |
436 | NFA_PUT(inst->skb, NFULA_PREFIX, plen, prefix); | |
0597f268 HW |
437 | |
438 | if (indev) { | |
439 | tmp_uint = htonl(indev->ifindex); | |
fbcd923c | 440 | #ifndef CONFIG_BRIDGE_NETFILTER |
0597f268 HW |
441 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint), |
442 | &tmp_uint); | |
fbcd923c HW |
443 | #else |
444 | if (pf == PF_BRIDGE) { | |
445 | /* Case 1: outdev is physical input device, we need to | |
446 | * look for bridge group (when called from | |
447 | * netfilter_bridge) */ | |
448 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
449 | sizeof(tmp_uint), &tmp_uint); | |
450 | /* this is the bridge group "brX" */ | |
451 | tmp_uint = htonl(indev->br_port->br->dev->ifindex); | |
452 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, | |
453 | sizeof(tmp_uint), &tmp_uint); | |
454 | } else { | |
455 | /* Case 2: indev is bridge group, we need to look for | |
456 | * physical device (when called from ipv4) */ | |
457 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, | |
458 | sizeof(tmp_uint), &tmp_uint); | |
459 | if (skb->nf_bridge && skb->nf_bridge->physindev) { | |
601e68e1 | 460 | tmp_uint = |
fbcd923c HW |
461 | htonl(skb->nf_bridge->physindev->ifindex); |
462 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
463 | sizeof(tmp_uint), &tmp_uint); | |
464 | } | |
465 | } | |
466 | #endif | |
0597f268 HW |
467 | } |
468 | ||
469 | if (outdev) { | |
470 | tmp_uint = htonl(outdev->ifindex); | |
fbcd923c | 471 | #ifndef CONFIG_BRIDGE_NETFILTER |
0597f268 HW |
472 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
473 | &tmp_uint); | |
fbcd923c HW |
474 | #else |
475 | if (pf == PF_BRIDGE) { | |
476 | /* Case 1: outdev is physical output device, we need to | |
477 | * look for bridge group (when called from | |
478 | * netfilter_bridge) */ | |
479 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
480 | sizeof(tmp_uint), &tmp_uint); | |
481 | /* this is the bridge group "brX" */ | |
482 | tmp_uint = htonl(outdev->br_port->br->dev->ifindex); | |
483 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, | |
484 | sizeof(tmp_uint), &tmp_uint); | |
485 | } else { | |
486 | /* Case 2: indev is a bridge group, we need to look | |
487 | * for physical device (when called from ipv4) */ | |
488 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, | |
489 | sizeof(tmp_uint), &tmp_uint); | |
490 | if (skb->nf_bridge) { | |
601e68e1 | 491 | tmp_uint = |
fbcd923c HW |
492 | htonl(skb->nf_bridge->physoutdev->ifindex); |
493 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
494 | sizeof(tmp_uint), &tmp_uint); | |
495 | } | |
496 | } | |
497 | #endif | |
0597f268 HW |
498 | } |
499 | ||
82e91ffe TG |
500 | if (skb->mark) { |
501 | tmp_uint = htonl(skb->mark); | |
0597f268 HW |
502 | NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint); |
503 | } | |
504 | ||
505 | if (indev && skb->dev && skb->dev->hard_header_parse) { | |
506 | struct nfulnl_msg_packet_hw phw; | |
98a4a861 | 507 | int len = skb->dev->hard_header_parse((struct sk_buff *)skb, |
0597f268 | 508 | phw.hw_addr); |
98a4a861 | 509 | phw.hw_addrlen = htons(len); |
0597f268 HW |
510 | NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw); |
511 | } | |
512 | ||
a61bbcf2 | 513 | if (skb->tstamp.off_sec) { |
0597f268 HW |
514 | struct nfulnl_msg_packet_timestamp ts; |
515 | ||
325ed823 HX |
516 | ts.sec = cpu_to_be64(skb->tstamp.off_sec); |
517 | ts.usec = cpu_to_be64(skb->tstamp.off_usec); | |
0597f268 HW |
518 | |
519 | NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); | |
520 | } | |
521 | ||
522 | /* UID */ | |
523 | if (skb->sk) { | |
524 | read_lock_bh(&skb->sk->sk_callback_lock); | |
525 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { | |
98a4a861 | 526 | __be32 uid = htonl(skb->sk->sk_socket->file->f_uid); |
0597f268 HW |
527 | /* need to unlock here since NFA_PUT may goto */ |
528 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
529 | NFA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid); | |
530 | } else | |
531 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
532 | } | |
533 | ||
0af5f6c1 HW |
534 | /* local sequence number */ |
535 | if (inst->flags & NFULNL_CFG_F_SEQ) { | |
536 | tmp_uint = htonl(inst->seq++); | |
537 | NFA_PUT(inst->skb, NFULA_SEQ, sizeof(tmp_uint), &tmp_uint); | |
538 | } | |
539 | /* global sequence number */ | |
540 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) { | |
7fdeaf68 | 541 | tmp_uint = htonl(atomic_inc_return(&global_seq)); |
0af5f6c1 HW |
542 | NFA_PUT(inst->skb, NFULA_SEQ_GLOBAL, sizeof(tmp_uint), &tmp_uint); |
543 | } | |
544 | ||
0597f268 HW |
545 | if (data_len) { |
546 | struct nfattr *nfa; | |
547 | int size = NFA_LENGTH(data_len); | |
548 | ||
549 | if (skb_tailroom(inst->skb) < (int)NFA_SPACE(data_len)) { | |
550 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); | |
551 | goto nlmsg_failure; | |
552 | } | |
553 | ||
554 | nfa = (struct nfattr *)skb_put(inst->skb, NFA_ALIGN(size)); | |
555 | nfa->nfa_type = NFULA_PAYLOAD; | |
556 | nfa->nfa_len = size; | |
557 | ||
558 | if (skb_copy_bits(skb, 0, NFA_DATA(nfa), data_len)) | |
559 | BUG(); | |
560 | } | |
601e68e1 | 561 | |
0597f268 | 562 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
a497097d | 563 | inst->lastnlh = nlh; |
0597f268 HW |
564 | return 0; |
565 | ||
566 | nlmsg_failure: | |
567 | UDEBUG("nlmsg_failure\n"); | |
568 | nfattr_failure: | |
569 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); | |
570 | return -1; | |
571 | } | |
572 | ||
573 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
574 | ||
575 | static struct nf_loginfo default_loginfo = { | |
576 | .type = NF_LOG_TYPE_ULOG, | |
577 | .u = { | |
578 | .ulog = { | |
579 | .copy_len = 0xffff, | |
580 | .group = 0, | |
581 | .qthreshold = 1, | |
582 | }, | |
583 | }, | |
584 | }; | |
585 | ||
586 | /* log handler for internal netfilter logging api */ | |
587 | static void | |
588 | nfulnl_log_packet(unsigned int pf, | |
589 | unsigned int hooknum, | |
590 | const struct sk_buff *skb, | |
591 | const struct net_device *in, | |
592 | const struct net_device *out, | |
593 | const struct nf_loginfo *li_user, | |
594 | const char *prefix) | |
595 | { | |
596 | unsigned int size, data_len; | |
597 | struct nfulnl_instance *inst; | |
598 | const struct nf_loginfo *li; | |
599 | unsigned int qthreshold; | |
600 | unsigned int nlbufsiz; | |
d7a5c324 | 601 | unsigned int plen; |
0597f268 | 602 | |
601e68e1 | 603 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
604 | li = li_user; |
605 | else | |
606 | li = &default_loginfo; | |
607 | ||
608 | inst = instance_lookup_get(li->u.ulog.group); | |
609 | if (!inst) | |
610 | inst = instance_lookup_get(0); | |
611 | if (!inst) { | |
612 | PRINTR("nfnetlink_log: trying to log packet, " | |
613 | "but no instance for group %u\n", li->u.ulog.group); | |
614 | return; | |
615 | } | |
616 | ||
d7a5c324 PM |
617 | plen = 0; |
618 | if (prefix) | |
619 | plen = strlen(prefix); | |
620 | ||
0597f268 HW |
621 | /* all macros expand to constant values at compile time */ |
622 | /* FIXME: do we want to make the size calculation conditional based on | |
623 | * what is actually present? way more branches and checks, but more | |
624 | * memory efficient... */ | |
625 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) | |
626 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr)) | |
627 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
628 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c HW |
629 | #ifdef CONFIG_BRIDGE_NETFILTER |
630 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
631 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
632 | #endif | |
0597f268 HW |
633 | + NFA_SPACE(sizeof(u_int32_t)) /* mark */ |
634 | + NFA_SPACE(sizeof(u_int32_t)) /* uid */ | |
d7a5c324 | 635 | + NFA_SPACE(plen) /* prefix */ |
0597f268 HW |
636 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw)) |
637 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp)); | |
638 | ||
639 | UDEBUG("initial size=%u\n", size); | |
640 | ||
641 | spin_lock_bh(&inst->lock); | |
642 | ||
0af5f6c1 HW |
643 | if (inst->flags & NFULNL_CFG_F_SEQ) |
644 | size += NFA_SPACE(sizeof(u_int32_t)); | |
645 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) | |
646 | size += NFA_SPACE(sizeof(u_int32_t)); | |
647 | ||
0597f268 HW |
648 | qthreshold = inst->qthreshold; |
649 | /* per-rule qthreshold overrides per-instance */ | |
650 | if (qthreshold > li->u.ulog.qthreshold) | |
651 | qthreshold = li->u.ulog.qthreshold; | |
601e68e1 | 652 | |
0597f268 HW |
653 | switch (inst->copy_mode) { |
654 | case NFULNL_COPY_META: | |
655 | case NFULNL_COPY_NONE: | |
656 | data_len = 0; | |
657 | break; | |
601e68e1 | 658 | |
0597f268 | 659 | case NFULNL_COPY_PACKET: |
601e68e1 | 660 | if (inst->copy_range == 0 |
0597f268 HW |
661 | || inst->copy_range > skb->len) |
662 | data_len = skb->len; | |
663 | else | |
664 | data_len = inst->copy_range; | |
601e68e1 | 665 | |
0597f268 HW |
666 | size += NFA_SPACE(data_len); |
667 | UDEBUG("copy_packet, therefore size now %u\n", size); | |
668 | break; | |
601e68e1 | 669 | |
0597f268 HW |
670 | default: |
671 | spin_unlock_bh(&inst->lock); | |
672 | instance_put(inst); | |
673 | return; | |
674 | } | |
675 | ||
676 | if (size > inst->nlbufsiz) | |
677 | nlbufsiz = size; | |
678 | else | |
679 | nlbufsiz = inst->nlbufsiz; | |
680 | ||
681 | if (!inst->skb) { | |
682 | if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) { | |
683 | UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n", | |
684 | inst->nlbufsiz, size); | |
685 | goto alloc_failure; | |
686 | } | |
687 | } else if (inst->qlen >= qthreshold || | |
688 | size > skb_tailroom(inst->skb)) { | |
689 | /* either the queue len is too high or we don't have | |
690 | * enough room in the skb left. flush to userspace. */ | |
691 | UDEBUG("flushing old skb\n"); | |
692 | ||
693 | __nfulnl_send(inst); | |
694 | ||
695 | if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) { | |
696 | UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n", | |
697 | inst->nlbufsiz, size); | |
698 | goto alloc_failure; | |
699 | } | |
700 | } | |
701 | ||
702 | UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold); | |
703 | inst->qlen++; | |
704 | ||
705 | __build_packet_message(inst, skb, data_len, pf, | |
d7a5c324 | 706 | hooknum, in, out, li, prefix, plen); |
0597f268 HW |
707 | |
708 | /* timer_pending always called within inst->lock, so there | |
709 | * is no chance of a race here */ | |
710 | if (!timer_pending(&inst->timer)) { | |
711 | instance_get(inst); | |
712 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
713 | add_timer(&inst->timer); | |
714 | } | |
0597f268 | 715 | |
ed32abea MM |
716 | unlock_and_release: |
717 | spin_unlock_bh(&inst->lock); | |
718 | instance_put(inst); | |
0597f268 HW |
719 | return; |
720 | ||
721 | alloc_failure: | |
0597f268 HW |
722 | UDEBUG("error allocating skb\n"); |
723 | /* FIXME: statistics */ | |
ed32abea | 724 | goto unlock_and_release; |
0597f268 HW |
725 | } |
726 | ||
727 | static int | |
728 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
729 | unsigned long event, void *ptr) | |
730 | { | |
731 | struct netlink_notify *n = ptr; | |
732 | ||
733 | if (event == NETLINK_URELEASE && | |
734 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
735 | int i; | |
736 | ||
737 | /* destroy all instances for this pid */ | |
738 | write_lock_bh(&instances_lock); | |
739 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
740 | struct hlist_node *tmp, *t2; | |
741 | struct nfulnl_instance *inst; | |
742 | struct hlist_head *head = &instance_table[i]; | |
743 | ||
744 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
745 | UDEBUG("node = %p\n", inst); | |
746 | if (n->pid == inst->peer_pid) | |
747 | __instance_destroy(inst); | |
748 | } | |
749 | } | |
750 | write_unlock_bh(&instances_lock); | |
751 | } | |
752 | return NOTIFY_DONE; | |
753 | } | |
754 | ||
755 | static struct notifier_block nfulnl_rtnl_notifier = { | |
756 | .notifier_call = nfulnl_rcv_nl_event, | |
757 | }; | |
758 | ||
759 | static int | |
760 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
761 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) | |
762 | { | |
763 | return -ENOTSUPP; | |
764 | } | |
765 | ||
766 | static struct nf_logger nfulnl_logger = { | |
767 | .name = "nfnetlink_log", | |
768 | .logfn = &nfulnl_log_packet, | |
769 | .me = THIS_MODULE, | |
770 | }; | |
771 | ||
772 | static const int nfula_min[NFULA_MAX] = { | |
773 | [NFULA_PACKET_HDR-1] = sizeof(struct nfulnl_msg_packet_hdr), | |
774 | [NFULA_MARK-1] = sizeof(u_int32_t), | |
775 | [NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp), | |
776 | [NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t), | |
777 | [NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t), | |
0af5f6c1 HW |
778 | [NFULA_IFINDEX_PHYSINDEV-1] = sizeof(u_int32_t), |
779 | [NFULA_IFINDEX_PHYSOUTDEV-1] = sizeof(u_int32_t), | |
0597f268 HW |
780 | [NFULA_HWADDR-1] = sizeof(struct nfulnl_msg_packet_hw), |
781 | [NFULA_PAYLOAD-1] = 0, | |
782 | [NFULA_PREFIX-1] = 0, | |
783 | [NFULA_UID-1] = sizeof(u_int32_t), | |
0af5f6c1 HW |
784 | [NFULA_SEQ-1] = sizeof(u_int32_t), |
785 | [NFULA_SEQ_GLOBAL-1] = sizeof(u_int32_t), | |
0597f268 HW |
786 | }; |
787 | ||
788 | static const int nfula_cfg_min[NFULA_CFG_MAX] = { | |
789 | [NFULA_CFG_CMD-1] = sizeof(struct nfulnl_msg_config_cmd), | |
790 | [NFULA_CFG_MODE-1] = sizeof(struct nfulnl_msg_config_mode), | |
791 | [NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t), | |
792 | [NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t), | |
793 | [NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t), | |
0af5f6c1 | 794 | [NFULA_CFG_FLAGS-1] = sizeof(u_int16_t), |
0597f268 HW |
795 | }; |
796 | ||
797 | static int | |
798 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
799 | struct nlmsghdr *nlh, struct nfattr *nfula[], int *errp) | |
800 | { | |
801 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
802 | u_int16_t group_num = ntohs(nfmsg->res_id); | |
803 | struct nfulnl_instance *inst; | |
804 | int ret = 0; | |
805 | ||
806 | UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); | |
807 | ||
808 | if (nfattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) { | |
809 | UDEBUG("bad attribute size\n"); | |
810 | return -EINVAL; | |
811 | } | |
812 | ||
813 | inst = instance_lookup_get(group_num); | |
814 | if (nfula[NFULA_CFG_CMD-1]) { | |
815 | u_int8_t pf = nfmsg->nfgen_family; | |
816 | struct nfulnl_msg_config_cmd *cmd; | |
817 | cmd = NFA_DATA(nfula[NFULA_CFG_CMD-1]); | |
818 | UDEBUG("found CFG_CMD for\n"); | |
819 | ||
820 | switch (cmd->command) { | |
821 | case NFULNL_CFG_CMD_BIND: | |
822 | if (inst) { | |
823 | ret = -EBUSY; | |
824 | goto out_put; | |
825 | } | |
826 | ||
827 | inst = instance_create(group_num, | |
828 | NETLINK_CB(skb).pid); | |
829 | if (!inst) { | |
830 | ret = -EINVAL; | |
831 | goto out_put; | |
832 | } | |
833 | break; | |
834 | case NFULNL_CFG_CMD_UNBIND: | |
835 | if (!inst) { | |
836 | ret = -ENODEV; | |
837 | goto out_put; | |
838 | } | |
839 | ||
840 | if (inst->peer_pid != NETLINK_CB(skb).pid) { | |
841 | ret = -EPERM; | |
842 | goto out_put; | |
843 | } | |
844 | ||
845 | instance_destroy(inst); | |
846 | break; | |
847 | case NFULNL_CFG_CMD_PF_BIND: | |
848 | UDEBUG("registering log handler for pf=%u\n", pf); | |
849 | ret = nf_log_register(pf, &nfulnl_logger); | |
850 | break; | |
851 | case NFULNL_CFG_CMD_PF_UNBIND: | |
852 | UDEBUG("unregistering log handler for pf=%u\n", pf); | |
853 | /* This is a bug and a feature. We cannot unregister | |
854 | * other handlers, like nfnetlink_inst can */ | |
855 | nf_log_unregister_pf(pf); | |
856 | break; | |
857 | default: | |
858 | ret = -EINVAL; | |
859 | break; | |
860 | } | |
861 | } else { | |
862 | if (!inst) { | |
863 | UDEBUG("no config command, and no instance for " | |
864 | "group=%u pid=%u =>ENOENT\n", | |
865 | group_num, NETLINK_CB(skb).pid); | |
866 | ret = -ENOENT; | |
867 | goto out_put; | |
868 | } | |
869 | ||
870 | if (inst->peer_pid != NETLINK_CB(skb).pid) { | |
871 | UDEBUG("no config command, and wrong pid\n"); | |
872 | ret = -EPERM; | |
873 | goto out_put; | |
874 | } | |
875 | } | |
876 | ||
877 | if (nfula[NFULA_CFG_MODE-1]) { | |
878 | struct nfulnl_msg_config_mode *params; | |
879 | params = NFA_DATA(nfula[NFULA_CFG_MODE-1]); | |
880 | ||
881 | nfulnl_set_mode(inst, params->copy_mode, | |
d1208b99 | 882 | ntohl(params->copy_range)); |
0597f268 HW |
883 | } |
884 | ||
885 | if (nfula[NFULA_CFG_TIMEOUT-1]) { | |
98a4a861 AV |
886 | __be32 timeout = |
887 | *(__be32 *)NFA_DATA(nfula[NFULA_CFG_TIMEOUT-1]); | |
0597f268 HW |
888 | |
889 | nfulnl_set_timeout(inst, ntohl(timeout)); | |
890 | } | |
891 | ||
892 | if (nfula[NFULA_CFG_NLBUFSIZ-1]) { | |
98a4a861 AV |
893 | __be32 nlbufsiz = |
894 | *(__be32 *)NFA_DATA(nfula[NFULA_CFG_NLBUFSIZ-1]); | |
0597f268 HW |
895 | |
896 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); | |
897 | } | |
898 | ||
899 | if (nfula[NFULA_CFG_QTHRESH-1]) { | |
7ac00a24 AV |
900 | __be32 qthresh = |
901 | *(__be32 *)NFA_DATA(nfula[NFULA_CFG_QTHRESH-1]); | |
0597f268 HW |
902 | |
903 | nfulnl_set_qthresh(inst, ntohl(qthresh)); | |
904 | } | |
905 | ||
0af5f6c1 | 906 | if (nfula[NFULA_CFG_FLAGS-1]) { |
98a4a861 AV |
907 | __be16 flags = |
908 | *(__be16 *)NFA_DATA(nfula[NFULA_CFG_FLAGS-1]); | |
ee433530 | 909 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
910 | } |
911 | ||
0597f268 HW |
912 | out_put: |
913 | instance_put(inst); | |
914 | return ret; | |
915 | } | |
916 | ||
917 | static struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { | |
918 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, | |
37d2e7a2 | 919 | .attr_count = NFULA_MAX, }, |
0597f268 | 920 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
37d2e7a2 | 921 | .attr_count = NFULA_CFG_MAX, }, |
0597f268 HW |
922 | }; |
923 | ||
924 | static struct nfnetlink_subsystem nfulnl_subsys = { | |
925 | .name = "log", | |
926 | .subsys_id = NFNL_SUBSYS_ULOG, | |
927 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
928 | .cb = nfulnl_cb, |
929 | }; | |
930 | ||
931 | #ifdef CONFIG_PROC_FS | |
932 | struct iter_state { | |
933 | unsigned int bucket; | |
934 | }; | |
935 | ||
936 | static struct hlist_node *get_first(struct seq_file *seq) | |
937 | { | |
938 | struct iter_state *st = seq->private; | |
939 | ||
940 | if (!st) | |
941 | return NULL; | |
942 | ||
943 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
944 | if (!hlist_empty(&instance_table[st->bucket])) | |
945 | return instance_table[st->bucket].first; | |
946 | } | |
947 | return NULL; | |
948 | } | |
949 | ||
950 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
951 | { | |
952 | struct iter_state *st = seq->private; | |
953 | ||
954 | h = h->next; | |
955 | while (!h) { | |
956 | if (++st->bucket >= INSTANCE_BUCKETS) | |
957 | return NULL; | |
958 | ||
959 | h = instance_table[st->bucket].first; | |
960 | } | |
961 | return h; | |
962 | } | |
963 | ||
964 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
965 | { | |
966 | struct hlist_node *head; | |
967 | head = get_first(seq); | |
968 | ||
969 | if (head) | |
970 | while (pos && (head = get_next(seq, head))) | |
971 | pos--; | |
972 | return pos ? NULL : head; | |
973 | } | |
974 | ||
975 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
976 | { | |
977 | read_lock_bh(&instances_lock); | |
978 | return get_idx(seq, *pos); | |
979 | } | |
980 | ||
981 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
982 | { | |
983 | (*pos)++; | |
984 | return get_next(s, v); | |
985 | } | |
986 | ||
987 | static void seq_stop(struct seq_file *s, void *v) | |
988 | { | |
989 | read_unlock_bh(&instances_lock); | |
990 | } | |
991 | ||
992 | static int seq_show(struct seq_file *s, void *v) | |
993 | { | |
994 | const struct nfulnl_instance *inst = v; | |
995 | ||
601e68e1 | 996 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 997 | inst->group_num, |
601e68e1 | 998 | inst->peer_pid, inst->qlen, |
0597f268 HW |
999 | inst->copy_mode, inst->copy_range, |
1000 | inst->flushtimeout, atomic_read(&inst->use)); | |
1001 | } | |
1002 | ||
1003 | static struct seq_operations nful_seq_ops = { | |
1004 | .start = seq_start, | |
1005 | .next = seq_next, | |
1006 | .stop = seq_stop, | |
1007 | .show = seq_show, | |
1008 | }; | |
1009 | ||
1010 | static int nful_open(struct inode *inode, struct file *file) | |
1011 | { | |
1012 | struct seq_file *seq; | |
1013 | struct iter_state *is; | |
1014 | int ret; | |
1015 | ||
10dfdc69 | 1016 | is = kzalloc(sizeof(*is), GFP_KERNEL); |
0597f268 HW |
1017 | if (!is) |
1018 | return -ENOMEM; | |
0597f268 HW |
1019 | ret = seq_open(file, &nful_seq_ops); |
1020 | if (ret < 0) | |
1021 | goto out_free; | |
1022 | seq = file->private_data; | |
1023 | seq->private = is; | |
1024 | return ret; | |
1025 | out_free: | |
1026 | kfree(is); | |
1027 | return ret; | |
1028 | } | |
1029 | ||
da7071d7 | 1030 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
1031 | .owner = THIS_MODULE, |
1032 | .open = nful_open, | |
1033 | .read = seq_read, | |
1034 | .llseek = seq_lseek, | |
1035 | .release = seq_release_private, | |
1036 | }; | |
1037 | ||
1038 | #endif /* PROC_FS */ | |
1039 | ||
32292a7f | 1040 | static int __init nfnetlink_log_init(void) |
0597f268 HW |
1041 | { |
1042 | int i, status = -ENOMEM; | |
1043 | #ifdef CONFIG_PROC_FS | |
1044 | struct proc_dir_entry *proc_nful; | |
1045 | #endif | |
601e68e1 | 1046 | |
0597f268 HW |
1047 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1048 | INIT_HLIST_HEAD(&instance_table[i]); | |
601e68e1 | 1049 | |
0597f268 HW |
1050 | /* it's not really all that important to have a random value, so |
1051 | * we can do this from the init function, even if there hasn't | |
1052 | * been that much entropy yet */ | |
1053 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
1054 | ||
1055 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
1056 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1057 | if (status < 0) { | |
1058 | printk(KERN_ERR "log: failed to create netlink socket\n"); | |
1059 | goto cleanup_netlink_notifier; | |
1060 | } | |
1061 | ||
1062 | #ifdef CONFIG_PROC_FS | |
1063 | proc_nful = create_proc_entry("nfnetlink_log", 0440, | |
1064 | proc_net_netfilter); | |
1065 | if (!proc_nful) | |
1066 | goto cleanup_subsys; | |
1067 | proc_nful->proc_fops = &nful_file_ops; | |
1068 | #endif | |
0597f268 HW |
1069 | return status; |
1070 | ||
0597f268 | 1071 | #ifdef CONFIG_PROC_FS |
0597f268 | 1072 | cleanup_subsys: |
0597f268 | 1073 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
32292a7f | 1074 | #endif |
0597f268 HW |
1075 | cleanup_netlink_notifier: |
1076 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1077 | return status; | |
1078 | } | |
1079 | ||
65b4b4e8 | 1080 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1081 | { |
e92ad99c | 1082 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1083 | #ifdef CONFIG_PROC_FS |
1084 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); | |
1085 | #endif | |
1086 | nfnetlink_subsys_unregister(&nfulnl_subsys); | |
1087 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1088 | } |
1089 | ||
1090 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1091 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1092 | MODULE_LICENSE("GPL"); | |
f682faef | 1093 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 1094 | |
65b4b4e8 AM |
1095 | module_init(nfnetlink_log_init); |
1096 | module_exit(nfnetlink_log_fini); |