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Commit | Line | Data |
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7af4cc3f HW |
1 | /* |
2 | * This is a module which is used for queueing packets and communicating with | |
3 | * userspace via nfetlink. | |
4 | * | |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
6 | * | |
7 | * Based on the old ipv4-only ip_queue.c: | |
8 | * (C) 2000-2002 James Morris <jmorris@intercode.com.au> | |
9 | * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | * | |
15 | */ | |
16 | #include <linux/module.h> | |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/notifier.h> | |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/netfilter.h> | |
838ab636 | 23 | #include <linux/proc_fs.h> |
7af4cc3f HW |
24 | #include <linux/netfilter_ipv4.h> |
25 | #include <linux/netfilter_ipv6.h> | |
26 | #include <linux/netfilter/nfnetlink.h> | |
27 | #include <linux/netfilter/nfnetlink_queue.h> | |
28 | #include <linux/list.h> | |
29 | #include <net/sock.h> | |
30 | ||
31 | #include <asm/atomic.h> | |
32 | ||
fbcd923c HW |
33 | #ifdef CONFIG_BRIDGE_NETFILTER |
34 | #include "../bridge/br_private.h" | |
35 | #endif | |
36 | ||
7af4cc3f HW |
37 | #define NFQNL_QMAX_DEFAULT 1024 |
38 | ||
39 | #if 0 | |
40 | #define QDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \ | |
41 | __FILE__, __LINE__, __FUNCTION__, \ | |
42 | ## args) | |
43 | #else | |
44 | #define QDEBUG(x, ...) | |
45 | #endif | |
46 | ||
47 | struct nfqnl_queue_entry { | |
48 | struct list_head list; | |
49 | struct nf_info *info; | |
50 | struct sk_buff *skb; | |
51 | unsigned int id; | |
52 | }; | |
53 | ||
54 | struct nfqnl_instance { | |
55 | struct hlist_node hlist; /* global list of queues */ | |
838ab636 | 56 | atomic_t use; |
7af4cc3f HW |
57 | |
58 | int peer_pid; | |
59 | unsigned int queue_maxlen; | |
60 | unsigned int copy_range; | |
61 | unsigned int queue_total; | |
62 | unsigned int queue_dropped; | |
63 | unsigned int queue_user_dropped; | |
64 | ||
65 | atomic_t id_sequence; /* 'sequence' of pkt ids */ | |
66 | ||
67 | u_int16_t queue_num; /* number of this queue */ | |
68 | u_int8_t copy_mode; | |
69 | ||
70 | spinlock_t lock; | |
71 | ||
72 | struct list_head queue_list; /* packets in queue */ | |
73 | }; | |
74 | ||
75 | typedef int (*nfqnl_cmpfn)(struct nfqnl_queue_entry *, unsigned long); | |
76 | ||
77 | static DEFINE_RWLOCK(instances_lock); | |
78 | ||
79 | u_int64_t htonll(u_int64_t in) | |
80 | { | |
81 | u_int64_t out; | |
82 | int i; | |
83 | ||
84 | for (i = 0; i < sizeof(u_int64_t); i++) | |
85 | ((u_int8_t *)&out)[sizeof(u_int64_t)-1] = ((u_int8_t *)&in)[i]; | |
86 | ||
87 | return out; | |
88 | } | |
89 | ||
90 | #define INSTANCE_BUCKETS 16 | |
91 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
92 | ||
93 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
94 | { | |
95 | return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS; | |
96 | } | |
97 | ||
98 | static struct nfqnl_instance * | |
99 | __instance_lookup(u_int16_t queue_num) | |
100 | { | |
101 | struct hlist_head *head; | |
102 | struct hlist_node *pos; | |
103 | struct nfqnl_instance *inst; | |
104 | ||
105 | head = &instance_table[instance_hashfn(queue_num)]; | |
106 | hlist_for_each_entry(inst, pos, head, hlist) { | |
107 | if (inst->queue_num == queue_num) | |
108 | return inst; | |
109 | } | |
110 | return NULL; | |
111 | } | |
112 | ||
113 | static struct nfqnl_instance * | |
838ab636 | 114 | instance_lookup_get(u_int16_t queue_num) |
7af4cc3f HW |
115 | { |
116 | struct nfqnl_instance *inst; | |
117 | ||
118 | read_lock_bh(&instances_lock); | |
119 | inst = __instance_lookup(queue_num); | |
838ab636 HW |
120 | if (inst) |
121 | atomic_inc(&inst->use); | |
7af4cc3f HW |
122 | read_unlock_bh(&instances_lock); |
123 | ||
124 | return inst; | |
125 | } | |
126 | ||
838ab636 HW |
127 | static void |
128 | instance_put(struct nfqnl_instance *inst) | |
129 | { | |
130 | if (inst && atomic_dec_and_test(&inst->use)) { | |
131 | QDEBUG("kfree(inst=%p)\n", inst); | |
132 | kfree(inst); | |
133 | } | |
134 | } | |
135 | ||
7af4cc3f HW |
136 | static struct nfqnl_instance * |
137 | instance_create(u_int16_t queue_num, int pid) | |
138 | { | |
139 | struct nfqnl_instance *inst; | |
140 | ||
141 | QDEBUG("entering for queue_num=%u, pid=%d\n", queue_num, pid); | |
142 | ||
143 | write_lock_bh(&instances_lock); | |
144 | if (__instance_lookup(queue_num)) { | |
145 | inst = NULL; | |
146 | QDEBUG("aborting, instance already exists\n"); | |
147 | goto out_unlock; | |
148 | } | |
149 | ||
150 | inst = kmalloc(sizeof(*inst), GFP_ATOMIC); | |
151 | if (!inst) | |
152 | goto out_unlock; | |
153 | ||
154 | memset(inst, 0, sizeof(*inst)); | |
155 | inst->queue_num = queue_num; | |
156 | inst->peer_pid = pid; | |
157 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; | |
158 | inst->copy_range = 0xfffff; | |
159 | inst->copy_mode = NFQNL_COPY_NONE; | |
160 | atomic_set(&inst->id_sequence, 0); | |
838ab636 HW |
161 | /* needs to be two, since we _put() after creation */ |
162 | atomic_set(&inst->use, 2); | |
7af4cc3f HW |
163 | inst->lock = SPIN_LOCK_UNLOCKED; |
164 | INIT_LIST_HEAD(&inst->queue_list); | |
165 | ||
166 | if (!try_module_get(THIS_MODULE)) | |
167 | goto out_free; | |
168 | ||
169 | hlist_add_head(&inst->hlist, | |
170 | &instance_table[instance_hashfn(queue_num)]); | |
171 | ||
172 | write_unlock_bh(&instances_lock); | |
173 | ||
174 | QDEBUG("successfully created new instance\n"); | |
175 | ||
176 | return inst; | |
177 | ||
178 | out_free: | |
179 | kfree(inst); | |
180 | out_unlock: | |
181 | write_unlock_bh(&instances_lock); | |
182 | return NULL; | |
183 | } | |
184 | ||
185 | static void nfqnl_flush(struct nfqnl_instance *queue, int verdict); | |
186 | ||
187 | static void | |
188 | _instance_destroy2(struct nfqnl_instance *inst, int lock) | |
189 | { | |
190 | /* first pull it out of the global list */ | |
191 | if (lock) | |
192 | write_lock_bh(&instances_lock); | |
193 | ||
194 | QDEBUG("removing instance %p (queuenum=%u) from hash\n", | |
195 | inst, inst->queue_num); | |
196 | hlist_del(&inst->hlist); | |
197 | ||
198 | if (lock) | |
199 | write_unlock_bh(&instances_lock); | |
200 | ||
201 | /* then flush all pending skbs from the queue */ | |
202 | nfqnl_flush(inst, NF_DROP); | |
203 | ||
838ab636 HW |
204 | /* and finally put the refcount */ |
205 | instance_put(inst); | |
7af4cc3f HW |
206 | |
207 | module_put(THIS_MODULE); | |
208 | } | |
209 | ||
210 | static inline void | |
211 | __instance_destroy(struct nfqnl_instance *inst) | |
212 | { | |
213 | _instance_destroy2(inst, 0); | |
214 | } | |
215 | ||
216 | static inline void | |
217 | instance_destroy(struct nfqnl_instance *inst) | |
218 | { | |
219 | _instance_destroy2(inst, 1); | |
220 | } | |
221 | ||
222 | ||
223 | ||
224 | static void | |
225 | issue_verdict(struct nfqnl_queue_entry *entry, int verdict) | |
226 | { | |
227 | QDEBUG("entering for entry %p, verdict %u\n", entry, verdict); | |
228 | ||
229 | /* TCP input path (and probably other bits) assume to be called | |
230 | * from softirq context, not from syscall, like issue_verdict is | |
231 | * called. TCP input path deadlocks with locks taken from timer | |
232 | * softirq, e.g. We therefore emulate this by local_bh_disable() */ | |
233 | ||
234 | local_bh_disable(); | |
235 | nf_reinject(entry->skb, entry->info, verdict); | |
236 | local_bh_enable(); | |
237 | ||
238 | kfree(entry); | |
239 | } | |
240 | ||
241 | static inline void | |
242 | __enqueue_entry(struct nfqnl_instance *queue, | |
243 | struct nfqnl_queue_entry *entry) | |
244 | { | |
245 | list_add(&entry->list, &queue->queue_list); | |
246 | queue->queue_total++; | |
247 | } | |
248 | ||
249 | /* | |
250 | * Find and return a queued entry matched by cmpfn, or return the last | |
251 | * entry if cmpfn is NULL. | |
252 | */ | |
253 | static inline struct nfqnl_queue_entry * | |
254 | __find_entry(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, | |
255 | unsigned long data) | |
256 | { | |
257 | struct list_head *p; | |
258 | ||
259 | list_for_each_prev(p, &queue->queue_list) { | |
260 | struct nfqnl_queue_entry *entry = (struct nfqnl_queue_entry *)p; | |
261 | ||
262 | if (!cmpfn || cmpfn(entry, data)) | |
263 | return entry; | |
264 | } | |
265 | return NULL; | |
266 | } | |
267 | ||
268 | static inline void | |
269 | __dequeue_entry(struct nfqnl_instance *q, struct nfqnl_queue_entry *entry) | |
270 | { | |
271 | list_del(&entry->list); | |
272 | q->queue_total--; | |
273 | } | |
274 | ||
275 | static inline struct nfqnl_queue_entry * | |
276 | __find_dequeue_entry(struct nfqnl_instance *queue, | |
277 | nfqnl_cmpfn cmpfn, unsigned long data) | |
278 | { | |
279 | struct nfqnl_queue_entry *entry; | |
280 | ||
281 | entry = __find_entry(queue, cmpfn, data); | |
282 | if (entry == NULL) | |
283 | return NULL; | |
284 | ||
285 | __dequeue_entry(queue, entry); | |
286 | return entry; | |
287 | } | |
288 | ||
289 | ||
290 | static inline void | |
291 | __nfqnl_flush(struct nfqnl_instance *queue, int verdict) | |
292 | { | |
293 | struct nfqnl_queue_entry *entry; | |
294 | ||
295 | while ((entry = __find_dequeue_entry(queue, NULL, 0))) | |
296 | issue_verdict(entry, verdict); | |
297 | } | |
298 | ||
299 | static inline int | |
300 | __nfqnl_set_mode(struct nfqnl_instance *queue, | |
301 | unsigned char mode, unsigned int range) | |
302 | { | |
303 | int status = 0; | |
304 | ||
305 | switch (mode) { | |
306 | case NFQNL_COPY_NONE: | |
307 | case NFQNL_COPY_META: | |
308 | queue->copy_mode = mode; | |
309 | queue->copy_range = 0; | |
310 | break; | |
311 | ||
312 | case NFQNL_COPY_PACKET: | |
313 | queue->copy_mode = mode; | |
314 | /* we're using struct nfattr which has 16bit nfa_len */ | |
315 | if (range > 0xffff) | |
316 | queue->copy_range = 0xffff; | |
317 | else | |
318 | queue->copy_range = range; | |
319 | break; | |
320 | ||
321 | default: | |
322 | status = -EINVAL; | |
323 | ||
324 | } | |
325 | return status; | |
326 | } | |
327 | ||
328 | static struct nfqnl_queue_entry * | |
329 | find_dequeue_entry(struct nfqnl_instance *queue, | |
330 | nfqnl_cmpfn cmpfn, unsigned long data) | |
331 | { | |
332 | struct nfqnl_queue_entry *entry; | |
333 | ||
334 | spin_lock_bh(&queue->lock); | |
335 | entry = __find_dequeue_entry(queue, cmpfn, data); | |
336 | spin_unlock_bh(&queue->lock); | |
337 | ||
338 | return entry; | |
339 | } | |
340 | ||
341 | static void | |
342 | nfqnl_flush(struct nfqnl_instance *queue, int verdict) | |
343 | { | |
344 | spin_lock_bh(&queue->lock); | |
345 | __nfqnl_flush(queue, verdict); | |
346 | spin_unlock_bh(&queue->lock); | |
347 | } | |
348 | ||
349 | static struct sk_buff * | |
350 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
351 | struct nfqnl_queue_entry *entry, int *errp) | |
352 | { | |
353 | unsigned char *old_tail; | |
354 | size_t size; | |
355 | size_t data_len = 0; | |
356 | struct sk_buff *skb; | |
357 | struct nfqnl_msg_packet_hdr pmsg; | |
358 | struct nlmsghdr *nlh; | |
359 | struct nfgenmsg *nfmsg; | |
360 | unsigned int tmp_uint; | |
361 | ||
362 | QDEBUG("entered\n"); | |
363 | ||
364 | /* all macros expand to constant values at compile time */ | |
365 | size = NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hdr)) | |
366 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
367 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c HW |
368 | #ifdef CONFIG_BRIDGE_NETFILTER |
369 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
370 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
371 | #endif | |
7af4cc3f HW |
372 | + NLMSG_SPACE(sizeof(u_int32_t)) /* mark */ |
373 | + NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hw)) | |
374 | + NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_timestamp)); | |
375 | ||
376 | spin_lock_bh(&queue->lock); | |
377 | ||
378 | switch (queue->copy_mode) { | |
379 | case NFQNL_COPY_META: | |
380 | case NFQNL_COPY_NONE: | |
381 | data_len = 0; | |
382 | break; | |
383 | ||
384 | case NFQNL_COPY_PACKET: | |
385 | if (queue->copy_range == 0 | |
386 | || queue->copy_range > entry->skb->len) | |
387 | data_len = entry->skb->len; | |
388 | else | |
389 | data_len = queue->copy_range; | |
390 | ||
391 | size += NLMSG_SPACE(data_len); | |
392 | break; | |
393 | ||
394 | default: | |
395 | *errp = -EINVAL; | |
396 | spin_unlock_bh(&queue->lock); | |
397 | return NULL; | |
398 | } | |
399 | ||
400 | spin_unlock_bh(&queue->lock); | |
401 | ||
402 | skb = alloc_skb(size, GFP_ATOMIC); | |
403 | if (!skb) | |
404 | goto nlmsg_failure; | |
405 | ||
406 | old_tail= skb->tail; | |
407 | nlh = NLMSG_PUT(skb, 0, 0, | |
408 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, | |
409 | sizeof(struct nfgenmsg)); | |
410 | nfmsg = NLMSG_DATA(nlh); | |
411 | nfmsg->nfgen_family = entry->info->pf; | |
412 | nfmsg->version = NFNETLINK_V0; | |
413 | nfmsg->res_id = htons(queue->queue_num); | |
414 | ||
415 | pmsg.packet_id = htonl(entry->id); | |
416 | pmsg.hw_protocol = htons(entry->skb->protocol); | |
417 | pmsg.hook = entry->info->hook; | |
418 | ||
419 | NFA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg); | |
420 | ||
421 | if (entry->info->indev) { | |
422 | tmp_uint = htonl(entry->info->indev->ifindex); | |
fbcd923c | 423 | #ifndef CONFIG_BRIDGE_NETFILTER |
7af4cc3f | 424 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c HW |
425 | #else |
426 | if (entry->info->pf == PF_BRIDGE) { | |
427 | /* Case 1: indev is physical input device, we need to | |
428 | * look for bridge group (when called from | |
429 | * netfilter_bridge) */ | |
430 | NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, sizeof(tmp_uint), | |
431 | &tmp_uint); | |
432 | /* this is the bridge group "brX" */ | |
433 | tmp_uint = htonl(entry->info->indev->br_port->br->dev->ifindex); | |
434 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), | |
435 | &tmp_uint); | |
436 | } else { | |
437 | /* Case 2: indev is bridge group, we need to look for | |
438 | * physical device (when called from ipv4) */ | |
439 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), | |
440 | &tmp_uint); | |
441 | if (entry->skb->nf_bridge | |
442 | && entry->skb->nf_bridge->physindev) { | |
443 | tmp_uint = htonl(entry->skb->nf_bridge->physindev->ifindex); | |
444 | NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, | |
445 | sizeof(tmp_uint), &tmp_uint); | |
446 | } | |
447 | } | |
448 | #endif | |
7af4cc3f HW |
449 | } |
450 | ||
451 | if (entry->info->outdev) { | |
452 | tmp_uint = htonl(entry->info->outdev->ifindex); | |
fbcd923c | 453 | #ifndef CONFIG_BRIDGE_NETFILTER |
7af4cc3f | 454 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c HW |
455 | #else |
456 | if (entry->info->pf == PF_BRIDGE) { | |
457 | /* Case 1: outdev is physical output device, we need to | |
458 | * look for bridge group (when called from | |
459 | * netfilter_bridge) */ | |
460 | NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, sizeof(tmp_uint), | |
461 | &tmp_uint); | |
462 | /* this is the bridge group "brX" */ | |
463 | tmp_uint = htonl(entry->info->outdev->br_port->br->dev->ifindex); | |
464 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), | |
465 | &tmp_uint); | |
466 | } else { | |
467 | /* Case 2: outdev is bridge group, we need to look for | |
468 | * physical output device (when called from ipv4) */ | |
469 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), | |
470 | &tmp_uint); | |
471 | if (entry->skb->nf_bridge | |
472 | && entry->skb->nf_bridge->physoutdev) { | |
473 | tmp_uint = htonl(entry->skb->nf_bridge->physoutdev->ifindex); | |
474 | NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
475 | sizeof(tmp_uint), &tmp_uint); | |
476 | } | |
477 | } | |
478 | #endif | |
7af4cc3f HW |
479 | } |
480 | ||
481 | if (entry->skb->nfmark) { | |
482 | tmp_uint = htonl(entry->skb->nfmark); | |
483 | NFA_PUT(skb, NFQA_MARK, sizeof(u_int32_t), &tmp_uint); | |
484 | } | |
485 | ||
486 | if (entry->info->indev && entry->skb->dev | |
487 | && entry->skb->dev->hard_header_parse) { | |
488 | struct nfqnl_msg_packet_hw phw; | |
489 | ||
490 | phw.hw_addrlen = | |
491 | entry->skb->dev->hard_header_parse(entry->skb, | |
492 | phw.hw_addr); | |
493 | phw.hw_addrlen = htons(phw.hw_addrlen); | |
494 | NFA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); | |
495 | } | |
496 | ||
a61bbcf2 | 497 | if (entry->skb->tstamp.off_sec) { |
7af4cc3f HW |
498 | struct nfqnl_msg_packet_timestamp ts; |
499 | ||
a61bbcf2 PM |
500 | ts.sec = htonll(skb_tv_base.tv_sec + entry->skb->tstamp.off_sec); |
501 | ts.usec = htonll(skb_tv_base.tv_usec + entry->skb->tstamp.off_usec); | |
7af4cc3f HW |
502 | |
503 | NFA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts); | |
504 | } | |
505 | ||
506 | if (data_len) { | |
507 | struct nfattr *nfa; | |
508 | int size = NFA_LENGTH(data_len); | |
509 | ||
510 | if (skb_tailroom(skb) < (int)NFA_SPACE(data_len)) { | |
511 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); | |
512 | goto nlmsg_failure; | |
513 | } | |
514 | ||
515 | nfa = (struct nfattr *)skb_put(skb, NFA_ALIGN(size)); | |
516 | nfa->nfa_type = NFQA_PAYLOAD; | |
517 | nfa->nfa_len = size; | |
518 | ||
519 | if (skb_copy_bits(entry->skb, 0, NFA_DATA(nfa), data_len)) | |
520 | BUG(); | |
521 | } | |
522 | ||
523 | nlh->nlmsg_len = skb->tail - old_tail; | |
524 | return skb; | |
525 | ||
526 | nlmsg_failure: | |
527 | nfattr_failure: | |
528 | if (skb) | |
529 | kfree_skb(skb); | |
530 | *errp = -EINVAL; | |
531 | if (net_ratelimit()) | |
532 | printk(KERN_ERR "nf_queue: error creating packet message\n"); | |
533 | return NULL; | |
534 | } | |
535 | ||
536 | static int | |
537 | nfqnl_enqueue_packet(struct sk_buff *skb, struct nf_info *info, | |
538 | unsigned int queuenum, void *data) | |
539 | { | |
540 | int status = -EINVAL; | |
541 | struct sk_buff *nskb; | |
542 | struct nfqnl_instance *queue; | |
543 | struct nfqnl_queue_entry *entry; | |
544 | ||
545 | QDEBUG("entered\n"); | |
546 | ||
838ab636 | 547 | queue = instance_lookup_get(queuenum); |
7af4cc3f HW |
548 | if (!queue) { |
549 | QDEBUG("no queue instance matching\n"); | |
550 | return -EINVAL; | |
551 | } | |
552 | ||
553 | if (queue->copy_mode == NFQNL_COPY_NONE) { | |
554 | QDEBUG("mode COPY_NONE, aborting\n"); | |
838ab636 HW |
555 | status = -EAGAIN; |
556 | goto err_out_put; | |
7af4cc3f HW |
557 | } |
558 | ||
559 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
560 | if (entry == NULL) { | |
561 | if (net_ratelimit()) | |
562 | printk(KERN_ERR | |
563 | "nf_queue: OOM in nfqnl_enqueue_packet()\n"); | |
838ab636 HW |
564 | status = -ENOMEM; |
565 | goto err_out_put; | |
7af4cc3f HW |
566 | } |
567 | ||
568 | entry->info = info; | |
569 | entry->skb = skb; | |
570 | entry->id = atomic_inc_return(&queue->id_sequence); | |
571 | ||
572 | nskb = nfqnl_build_packet_message(queue, entry, &status); | |
573 | if (nskb == NULL) | |
574 | goto err_out_free; | |
575 | ||
576 | spin_lock_bh(&queue->lock); | |
577 | ||
578 | if (!queue->peer_pid) | |
579 | goto err_out_free_nskb; | |
580 | ||
581 | if (queue->queue_total >= queue->queue_maxlen) { | |
582 | queue->queue_dropped++; | |
583 | status = -ENOSPC; | |
584 | if (net_ratelimit()) | |
585 | printk(KERN_WARNING "ip_queue: full at %d entries, " | |
586 | "dropping packets(s). Dropped: %d\n", | |
587 | queue->queue_total, queue->queue_dropped); | |
588 | goto err_out_free_nskb; | |
589 | } | |
590 | ||
591 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
592 | status = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT); | |
593 | if (status < 0) { | |
594 | queue->queue_user_dropped++; | |
595 | goto err_out_unlock; | |
596 | } | |
597 | ||
598 | __enqueue_entry(queue, entry); | |
599 | ||
600 | spin_unlock_bh(&queue->lock); | |
838ab636 | 601 | instance_put(queue); |
7af4cc3f HW |
602 | return status; |
603 | ||
604 | err_out_free_nskb: | |
605 | kfree_skb(nskb); | |
606 | ||
607 | err_out_unlock: | |
608 | spin_unlock_bh(&queue->lock); | |
609 | ||
610 | err_out_free: | |
611 | kfree(entry); | |
838ab636 HW |
612 | err_out_put: |
613 | instance_put(queue); | |
7af4cc3f HW |
614 | return status; |
615 | } | |
616 | ||
617 | static int | |
618 | nfqnl_mangle(void *data, int data_len, struct nfqnl_queue_entry *e) | |
619 | { | |
620 | int diff; | |
621 | ||
622 | diff = data_len - e->skb->len; | |
623 | if (diff < 0) | |
624 | skb_trim(e->skb, data_len); | |
625 | else if (diff > 0) { | |
626 | if (data_len > 0xFFFF) | |
627 | return -EINVAL; | |
628 | if (diff > skb_tailroom(e->skb)) { | |
629 | struct sk_buff *newskb; | |
630 | ||
631 | newskb = skb_copy_expand(e->skb, | |
632 | skb_headroom(e->skb), | |
633 | diff, | |
634 | GFP_ATOMIC); | |
635 | if (newskb == NULL) { | |
636 | printk(KERN_WARNING "ip_queue: OOM " | |
637 | "in mangle, dropping packet\n"); | |
638 | return -ENOMEM; | |
639 | } | |
640 | if (e->skb->sk) | |
641 | skb_set_owner_w(newskb, e->skb->sk); | |
642 | kfree_skb(e->skb); | |
643 | e->skb = newskb; | |
644 | } | |
645 | skb_put(e->skb, diff); | |
646 | } | |
647 | if (!skb_make_writable(&e->skb, data_len)) | |
648 | return -ENOMEM; | |
649 | memcpy(e->skb->data, data, data_len); | |
650 | ||
651 | return 0; | |
652 | } | |
653 | ||
654 | static inline int | |
655 | id_cmp(struct nfqnl_queue_entry *e, unsigned long id) | |
656 | { | |
657 | return (id == e->id); | |
658 | } | |
659 | ||
660 | static int | |
661 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
662 | unsigned char mode, unsigned int range) | |
663 | { | |
664 | int status; | |
665 | ||
666 | spin_lock_bh(&queue->lock); | |
667 | status = __nfqnl_set_mode(queue, mode, range); | |
668 | spin_unlock_bh(&queue->lock); | |
669 | ||
670 | return status; | |
671 | } | |
672 | ||
673 | static int | |
674 | dev_cmp(struct nfqnl_queue_entry *entry, unsigned long ifindex) | |
675 | { | |
676 | if (entry->info->indev) | |
677 | if (entry->info->indev->ifindex == ifindex) | |
678 | return 1; | |
679 | ||
680 | if (entry->info->outdev) | |
681 | if (entry->info->outdev->ifindex == ifindex) | |
682 | return 1; | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
687 | /* drop all packets with either indev or outdev == ifindex from all queue | |
688 | * instances */ | |
689 | static void | |
690 | nfqnl_dev_drop(int ifindex) | |
691 | { | |
692 | int i; | |
693 | ||
694 | QDEBUG("entering for ifindex %u\n", ifindex); | |
695 | ||
696 | /* this only looks like we have to hold the readlock for a way too long | |
697 | * time, issue_verdict(), nf_reinject(), ... - but we always only | |
698 | * issue NF_DROP, which is processed directly in nf_reinject() */ | |
699 | read_lock_bh(&instances_lock); | |
700 | ||
701 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
702 | struct hlist_node *tmp; | |
703 | struct nfqnl_instance *inst; | |
704 | struct hlist_head *head = &instance_table[i]; | |
705 | ||
706 | hlist_for_each_entry(inst, tmp, head, hlist) { | |
707 | struct nfqnl_queue_entry *entry; | |
708 | while ((entry = find_dequeue_entry(inst, dev_cmp, | |
709 | ifindex)) != NULL) | |
710 | issue_verdict(entry, NF_DROP); | |
711 | } | |
712 | } | |
713 | ||
714 | read_unlock_bh(&instances_lock); | |
715 | } | |
716 | ||
717 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
718 | ||
719 | static int | |
720 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
721 | unsigned long event, void *ptr) | |
722 | { | |
723 | struct net_device *dev = ptr; | |
724 | ||
725 | /* Drop any packets associated with the downed device */ | |
726 | if (event == NETDEV_DOWN) | |
727 | nfqnl_dev_drop(dev->ifindex); | |
728 | return NOTIFY_DONE; | |
729 | } | |
730 | ||
731 | static struct notifier_block nfqnl_dev_notifier = { | |
732 | .notifier_call = nfqnl_rcv_dev_event, | |
733 | }; | |
734 | ||
735 | static int | |
736 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
737 | unsigned long event, void *ptr) | |
738 | { | |
739 | struct netlink_notify *n = ptr; | |
740 | ||
741 | if (event == NETLINK_URELEASE && | |
742 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
743 | int i; | |
744 | ||
745 | /* destroy all instances for this pid */ | |
746 | write_lock_bh(&instances_lock); | |
747 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
748 | struct hlist_node *tmp, *t2; | |
749 | struct nfqnl_instance *inst; | |
750 | struct hlist_head *head = &instance_table[i]; | |
751 | ||
752 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
753 | if (n->pid == inst->peer_pid) | |
754 | __instance_destroy(inst); | |
755 | } | |
756 | } | |
757 | write_unlock_bh(&instances_lock); | |
758 | } | |
759 | return NOTIFY_DONE; | |
760 | } | |
761 | ||
762 | static struct notifier_block nfqnl_rtnl_notifier = { | |
763 | .notifier_call = nfqnl_rcv_nl_event, | |
764 | }; | |
765 | ||
838ab636 HW |
766 | static const int nfqa_verdict_min[NFQA_MAX] = { |
767 | [NFQA_VERDICT_HDR-1] = sizeof(struct nfqnl_msg_verdict_hdr), | |
768 | [NFQA_MARK-1] = sizeof(u_int32_t), | |
769 | [NFQA_PAYLOAD-1] = 0, | |
770 | }; | |
771 | ||
7af4cc3f HW |
772 | static int |
773 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
774 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) | |
775 | { | |
776 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
777 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
778 | ||
779 | struct nfqnl_msg_verdict_hdr *vhdr; | |
780 | struct nfqnl_instance *queue; | |
781 | unsigned int verdict; | |
782 | struct nfqnl_queue_entry *entry; | |
838ab636 | 783 | int err; |
7af4cc3f | 784 | |
838ab636 HW |
785 | if (nfattr_bad_size(nfqa, NFQA_MAX, nfqa_verdict_min)) { |
786 | QDEBUG("bad attribute size\n"); | |
787 | return -EINVAL; | |
788 | } | |
789 | ||
790 | queue = instance_lookup_get(queue_num); | |
7af4cc3f HW |
791 | if (!queue) |
792 | return -ENODEV; | |
793 | ||
838ab636 HW |
794 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
795 | err = -EPERM; | |
796 | goto err_out_put; | |
797 | } | |
7af4cc3f | 798 | |
838ab636 HW |
799 | if (!nfqa[NFQA_VERDICT_HDR-1]) { |
800 | err = -EINVAL; | |
801 | goto err_out_put; | |
802 | } | |
7af4cc3f HW |
803 | |
804 | vhdr = NFA_DATA(nfqa[NFQA_VERDICT_HDR-1]); | |
805 | verdict = ntohl(vhdr->verdict); | |
806 | ||
838ab636 HW |
807 | if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) { |
808 | err = -EINVAL; | |
809 | goto err_out_put; | |
810 | } | |
7af4cc3f HW |
811 | |
812 | entry = find_dequeue_entry(queue, id_cmp, ntohl(vhdr->id)); | |
838ab636 HW |
813 | if (entry == NULL) { |
814 | err = -ENOENT; | |
815 | goto err_out_put; | |
816 | } | |
7af4cc3f HW |
817 | |
818 | if (nfqa[NFQA_PAYLOAD-1]) { | |
819 | if (nfqnl_mangle(NFA_DATA(nfqa[NFQA_PAYLOAD-1]), | |
820 | NFA_PAYLOAD(nfqa[NFQA_PAYLOAD-1]), entry) < 0) | |
821 | verdict = NF_DROP; | |
822 | } | |
823 | ||
824 | if (nfqa[NFQA_MARK-1]) | |
825 | skb->nfmark = ntohl(*(u_int32_t *)NFA_DATA(nfqa[NFQA_MARK-1])); | |
826 | ||
827 | issue_verdict(entry, verdict); | |
838ab636 | 828 | instance_put(queue); |
7af4cc3f | 829 | return 0; |
838ab636 HW |
830 | |
831 | err_out_put: | |
832 | instance_put(queue); | |
833 | return err; | |
7af4cc3f HW |
834 | } |
835 | ||
836 | static int | |
837 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
838 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) | |
839 | { | |
840 | return -ENOTSUPP; | |
841 | } | |
842 | ||
838ab636 HW |
843 | static const int nfqa_cfg_min[NFQA_CFG_MAX] = { |
844 | [NFQA_CFG_CMD-1] = sizeof(struct nfqnl_msg_config_cmd), | |
845 | [NFQA_CFG_PARAMS-1] = sizeof(struct nfqnl_msg_config_params), | |
846 | }; | |
847 | ||
bbd86b9f HW |
848 | static struct nf_queue_handler nfqh = { |
849 | .name = "nf_queue", | |
850 | .outfn = &nfqnl_enqueue_packet, | |
851 | }; | |
852 | ||
7af4cc3f HW |
853 | static int |
854 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
855 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) | |
856 | { | |
857 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
858 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
859 | struct nfqnl_instance *queue; | |
838ab636 | 860 | int ret = 0; |
7af4cc3f HW |
861 | |
862 | QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); | |
863 | ||
838ab636 HW |
864 | if (nfattr_bad_size(nfqa, NFQA_CFG_MAX, nfqa_cfg_min)) { |
865 | QDEBUG("bad attribute size\n"); | |
866 | return -EINVAL; | |
867 | } | |
868 | ||
869 | queue = instance_lookup_get(queue_num); | |
7af4cc3f HW |
870 | if (nfqa[NFQA_CFG_CMD-1]) { |
871 | struct nfqnl_msg_config_cmd *cmd; | |
872 | cmd = NFA_DATA(nfqa[NFQA_CFG_CMD-1]); | |
873 | QDEBUG("found CFG_CMD\n"); | |
874 | ||
875 | switch (cmd->command) { | |
876 | case NFQNL_CFG_CMD_BIND: | |
877 | if (queue) | |
878 | return -EBUSY; | |
879 | ||
880 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); | |
881 | if (!queue) | |
882 | return -EINVAL; | |
883 | break; | |
884 | case NFQNL_CFG_CMD_UNBIND: | |
885 | if (!queue) | |
886 | return -ENODEV; | |
887 | ||
838ab636 HW |
888 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
889 | ret = -EPERM; | |
890 | goto out_put; | |
891 | } | |
7af4cc3f HW |
892 | |
893 | instance_destroy(queue); | |
894 | break; | |
895 | case NFQNL_CFG_CMD_PF_BIND: | |
896 | QDEBUG("registering queue handler for pf=%u\n", | |
897 | ntohs(cmd->pf)); | |
bbd86b9f | 898 | ret = nf_register_queue_handler(ntohs(cmd->pf), &nfqh); |
7af4cc3f HW |
899 | break; |
900 | case NFQNL_CFG_CMD_PF_UNBIND: | |
901 | QDEBUG("unregistering queue handler for pf=%u\n", | |
902 | ntohs(cmd->pf)); | |
903 | /* This is a bug and a feature. We can unregister | |
904 | * other handlers(!) */ | |
838ab636 | 905 | ret = nf_unregister_queue_handler(ntohs(cmd->pf)); |
7af4cc3f HW |
906 | break; |
907 | default: | |
838ab636 HW |
908 | ret = -EINVAL; |
909 | break; | |
7af4cc3f HW |
910 | } |
911 | } else { | |
912 | if (!queue) { | |
913 | QDEBUG("no config command, and no instance ENOENT\n"); | |
838ab636 HW |
914 | ret = -ENOENT; |
915 | goto out_put; | |
7af4cc3f HW |
916 | } |
917 | ||
918 | if (queue->peer_pid != NETLINK_CB(skb).pid) { | |
919 | QDEBUG("no config command, and wrong pid\n"); | |
838ab636 HW |
920 | ret = -EPERM; |
921 | goto out_put; | |
7af4cc3f HW |
922 | } |
923 | } | |
924 | ||
925 | if (nfqa[NFQA_CFG_PARAMS-1]) { | |
926 | struct nfqnl_msg_config_params *params; | |
927 | params = NFA_DATA(nfqa[NFQA_CFG_PARAMS-1]); | |
928 | ||
929 | nfqnl_set_mode(queue, params->copy_mode, | |
930 | ntohl(params->copy_range)); | |
931 | } | |
932 | ||
838ab636 HW |
933 | out_put: |
934 | instance_put(queue); | |
935 | return ret; | |
7af4cc3f HW |
936 | } |
937 | ||
938 | static struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { | |
939 | [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp, | |
927ccbcc | 940 | .attr_count = NFQA_MAX, |
7af4cc3f HW |
941 | .cap_required = CAP_NET_ADMIN }, |
942 | [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict, | |
927ccbcc | 943 | .attr_count = NFQA_MAX, |
7af4cc3f HW |
944 | .cap_required = CAP_NET_ADMIN }, |
945 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, | |
927ccbcc | 946 | .attr_count = NFQA_CFG_MAX, |
7af4cc3f HW |
947 | .cap_required = CAP_NET_ADMIN }, |
948 | }; | |
949 | ||
950 | static struct nfnetlink_subsystem nfqnl_subsys = { | |
951 | .name = "nf_queue", | |
952 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
953 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
954 | .cb = nfqnl_cb, |
955 | }; | |
956 | ||
838ab636 HW |
957 | #ifdef CONFIG_PROC_FS |
958 | struct iter_state { | |
959 | unsigned int bucket; | |
960 | }; | |
961 | ||
962 | static struct hlist_node *get_first(struct seq_file *seq) | |
963 | { | |
964 | struct iter_state *st = seq->private; | |
965 | ||
966 | if (!st) | |
967 | return NULL; | |
968 | ||
969 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
970 | if (!hlist_empty(&instance_table[st->bucket])) | |
971 | return instance_table[st->bucket].first; | |
972 | } | |
973 | return NULL; | |
974 | } | |
975 | ||
976 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
977 | { | |
978 | struct iter_state *st = seq->private; | |
979 | ||
980 | h = h->next; | |
981 | while (!h) { | |
982 | if (++st->bucket >= INSTANCE_BUCKETS) | |
983 | return NULL; | |
984 | ||
985 | h = instance_table[st->bucket].first; | |
986 | } | |
987 | return h; | |
988 | } | |
989 | ||
990 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
991 | { | |
992 | struct hlist_node *head; | |
993 | head = get_first(seq); | |
994 | ||
995 | if (head) | |
996 | while (pos && (head = get_next(seq, head))) | |
997 | pos--; | |
998 | return pos ? NULL : head; | |
999 | } | |
1000 | ||
1001 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
1002 | { | |
1003 | read_lock_bh(&instances_lock); | |
1004 | return get_idx(seq, *pos); | |
1005 | } | |
1006 | ||
1007 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1008 | { | |
1009 | (*pos)++; | |
1010 | return get_next(s, v); | |
1011 | } | |
1012 | ||
1013 | static void seq_stop(struct seq_file *s, void *v) | |
1014 | { | |
1015 | read_unlock_bh(&instances_lock); | |
1016 | } | |
1017 | ||
1018 | static int seq_show(struct seq_file *s, void *v) | |
1019 | { | |
1020 | const struct nfqnl_instance *inst = v; | |
1021 | ||
1022 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1023 | inst->queue_num, | |
1024 | inst->peer_pid, inst->queue_total, | |
1025 | inst->copy_mode, inst->copy_range, | |
1026 | inst->queue_dropped, inst->queue_user_dropped, | |
1027 | atomic_read(&inst->id_sequence), | |
1028 | atomic_read(&inst->use)); | |
1029 | } | |
1030 | ||
1031 | static struct seq_operations nfqnl_seq_ops = { | |
1032 | .start = seq_start, | |
1033 | .next = seq_next, | |
1034 | .stop = seq_stop, | |
1035 | .show = seq_show, | |
1036 | }; | |
1037 | ||
1038 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1039 | { | |
1040 | struct seq_file *seq; | |
1041 | struct iter_state *is; | |
1042 | int ret; | |
1043 | ||
1044 | is = kmalloc(sizeof(*is), GFP_KERNEL); | |
1045 | if (!is) | |
1046 | return -ENOMEM; | |
1047 | memset(is, 0, sizeof(*is)); | |
1048 | ret = seq_open(file, &nfqnl_seq_ops); | |
1049 | if (ret < 0) | |
1050 | goto out_free; | |
1051 | seq = file->private_data; | |
1052 | seq->private = is; | |
1053 | return ret; | |
1054 | out_free: | |
1055 | kfree(is); | |
1056 | return ret; | |
1057 | } | |
1058 | ||
1059 | static struct file_operations nfqnl_file_ops = { | |
1060 | .owner = THIS_MODULE, | |
1061 | .open = nfqnl_open, | |
1062 | .read = seq_read, | |
1063 | .llseek = seq_lseek, | |
1064 | .release = seq_release_private, | |
1065 | }; | |
1066 | ||
1067 | #endif /* PROC_FS */ | |
1068 | ||
7af4cc3f HW |
1069 | static int |
1070 | init_or_cleanup(int init) | |
1071 | { | |
838ab636 HW |
1072 | int i, status = -ENOMEM; |
1073 | #ifdef CONFIG_PROC_FS | |
1074 | struct proc_dir_entry *proc_nfqueue; | |
1075 | #endif | |
7af4cc3f HW |
1076 | |
1077 | if (!init) | |
1078 | goto cleanup; | |
1079 | ||
838ab636 HW |
1080 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1081 | INIT_HLIST_HEAD(&instance_table[i]); | |
1082 | ||
7af4cc3f HW |
1083 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1084 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1085 | if (status < 0) { | |
1086 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
1087 | goto cleanup_netlink_notifier; | |
1088 | } | |
1089 | ||
838ab636 HW |
1090 | #ifdef CONFIG_PROC_FS |
1091 | proc_nfqueue = create_proc_entry("nfnetlink_queue", 0440, | |
1092 | proc_net_netfilter); | |
1093 | if (!proc_nfqueue) | |
1094 | goto cleanup_subsys; | |
1095 | proc_nfqueue->proc_fops = &nfqnl_file_ops; | |
1096 | #endif | |
1097 | ||
7af4cc3f | 1098 | register_netdevice_notifier(&nfqnl_dev_notifier); |
838ab636 | 1099 | |
7af4cc3f HW |
1100 | return status; |
1101 | ||
1102 | cleanup: | |
bbd86b9f | 1103 | nf_unregister_queue_handlers(&nfqh); |
7af4cc3f | 1104 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
838ab636 | 1105 | #ifdef CONFIG_PROC_FS |
0597f268 | 1106 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); |
838ab636 HW |
1107 | cleanup_subsys: |
1108 | #endif | |
7af4cc3f | 1109 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
7af4cc3f HW |
1110 | cleanup_netlink_notifier: |
1111 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1112 | return status; | |
1113 | } | |
1114 | ||
1115 | static int __init init(void) | |
1116 | { | |
1117 | ||
1118 | return init_or_cleanup(1); | |
1119 | } | |
1120 | ||
1121 | static void __exit fini(void) | |
1122 | { | |
1123 | init_or_cleanup(0); | |
1124 | } | |
1125 | ||
1126 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1127 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1128 | MODULE_LICENSE("GPL"); | |
1129 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1130 | ||
1131 | module_init(init); | |
1132 | module_exit(fini); |