Commit | Line | Data |
---|---|---|
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 | ||
7af4cc3f HW |
79 | #define INSTANCE_BUCKETS 16 |
80 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
81 | ||
82 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
83 | { | |
84 | return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS; | |
85 | } | |
86 | ||
87 | static struct nfqnl_instance * | |
88 | __instance_lookup(u_int16_t queue_num) | |
89 | { | |
90 | struct hlist_head *head; | |
91 | struct hlist_node *pos; | |
92 | struct nfqnl_instance *inst; | |
93 | ||
94 | head = &instance_table[instance_hashfn(queue_num)]; | |
95 | hlist_for_each_entry(inst, pos, head, hlist) { | |
96 | if (inst->queue_num == queue_num) | |
97 | return inst; | |
98 | } | |
99 | return NULL; | |
100 | } | |
101 | ||
102 | static struct nfqnl_instance * | |
838ab636 | 103 | instance_lookup_get(u_int16_t queue_num) |
7af4cc3f HW |
104 | { |
105 | struct nfqnl_instance *inst; | |
106 | ||
107 | read_lock_bh(&instances_lock); | |
108 | inst = __instance_lookup(queue_num); | |
838ab636 HW |
109 | if (inst) |
110 | atomic_inc(&inst->use); | |
7af4cc3f HW |
111 | read_unlock_bh(&instances_lock); |
112 | ||
113 | return inst; | |
114 | } | |
115 | ||
838ab636 HW |
116 | static void |
117 | instance_put(struct nfqnl_instance *inst) | |
118 | { | |
119 | if (inst && atomic_dec_and_test(&inst->use)) { | |
120 | QDEBUG("kfree(inst=%p)\n", inst); | |
121 | kfree(inst); | |
122 | } | |
123 | } | |
124 | ||
7af4cc3f HW |
125 | static struct nfqnl_instance * |
126 | instance_create(u_int16_t queue_num, int pid) | |
127 | { | |
128 | struct nfqnl_instance *inst; | |
129 | ||
130 | QDEBUG("entering for queue_num=%u, pid=%d\n", queue_num, pid); | |
131 | ||
132 | write_lock_bh(&instances_lock); | |
133 | if (__instance_lookup(queue_num)) { | |
134 | inst = NULL; | |
135 | QDEBUG("aborting, instance already exists\n"); | |
136 | goto out_unlock; | |
137 | } | |
138 | ||
10dfdc69 | 139 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
7af4cc3f HW |
140 | if (!inst) |
141 | goto out_unlock; | |
142 | ||
7af4cc3f HW |
143 | inst->queue_num = queue_num; |
144 | inst->peer_pid = pid; | |
145 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; | |
146 | inst->copy_range = 0xfffff; | |
147 | inst->copy_mode = NFQNL_COPY_NONE; | |
148 | atomic_set(&inst->id_sequence, 0); | |
838ab636 HW |
149 | /* needs to be two, since we _put() after creation */ |
150 | atomic_set(&inst->use, 2); | |
181a46a5 | 151 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
152 | INIT_LIST_HEAD(&inst->queue_list); |
153 | ||
154 | if (!try_module_get(THIS_MODULE)) | |
155 | goto out_free; | |
156 | ||
157 | hlist_add_head(&inst->hlist, | |
158 | &instance_table[instance_hashfn(queue_num)]); | |
159 | ||
160 | write_unlock_bh(&instances_lock); | |
161 | ||
162 | QDEBUG("successfully created new instance\n"); | |
163 | ||
164 | return inst; | |
165 | ||
166 | out_free: | |
167 | kfree(inst); | |
168 | out_unlock: | |
169 | write_unlock_bh(&instances_lock); | |
170 | return NULL; | |
171 | } | |
172 | ||
173 | static void nfqnl_flush(struct nfqnl_instance *queue, int verdict); | |
174 | ||
175 | static void | |
176 | _instance_destroy2(struct nfqnl_instance *inst, int lock) | |
177 | { | |
178 | /* first pull it out of the global list */ | |
179 | if (lock) | |
180 | write_lock_bh(&instances_lock); | |
181 | ||
182 | QDEBUG("removing instance %p (queuenum=%u) from hash\n", | |
183 | inst, inst->queue_num); | |
184 | hlist_del(&inst->hlist); | |
185 | ||
186 | if (lock) | |
187 | write_unlock_bh(&instances_lock); | |
188 | ||
189 | /* then flush all pending skbs from the queue */ | |
190 | nfqnl_flush(inst, NF_DROP); | |
191 | ||
838ab636 HW |
192 | /* and finally put the refcount */ |
193 | instance_put(inst); | |
7af4cc3f HW |
194 | |
195 | module_put(THIS_MODULE); | |
196 | } | |
197 | ||
198 | static inline void | |
199 | __instance_destroy(struct nfqnl_instance *inst) | |
200 | { | |
201 | _instance_destroy2(inst, 0); | |
202 | } | |
203 | ||
204 | static inline void | |
205 | instance_destroy(struct nfqnl_instance *inst) | |
206 | { | |
207 | _instance_destroy2(inst, 1); | |
208 | } | |
209 | ||
210 | ||
211 | ||
212 | static void | |
213 | issue_verdict(struct nfqnl_queue_entry *entry, int verdict) | |
214 | { | |
215 | QDEBUG("entering for entry %p, verdict %u\n", entry, verdict); | |
216 | ||
217 | /* TCP input path (and probably other bits) assume to be called | |
218 | * from softirq context, not from syscall, like issue_verdict is | |
219 | * called. TCP input path deadlocks with locks taken from timer | |
220 | * softirq, e.g. We therefore emulate this by local_bh_disable() */ | |
221 | ||
222 | local_bh_disable(); | |
223 | nf_reinject(entry->skb, entry->info, verdict); | |
224 | local_bh_enable(); | |
225 | ||
226 | kfree(entry); | |
227 | } | |
228 | ||
229 | static inline void | |
230 | __enqueue_entry(struct nfqnl_instance *queue, | |
231 | struct nfqnl_queue_entry *entry) | |
232 | { | |
233 | list_add(&entry->list, &queue->queue_list); | |
234 | queue->queue_total++; | |
235 | } | |
236 | ||
237 | /* | |
238 | * Find and return a queued entry matched by cmpfn, or return the last | |
239 | * entry if cmpfn is NULL. | |
240 | */ | |
241 | static inline struct nfqnl_queue_entry * | |
242 | __find_entry(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, | |
243 | unsigned long data) | |
244 | { | |
245 | struct list_head *p; | |
246 | ||
247 | list_for_each_prev(p, &queue->queue_list) { | |
248 | struct nfqnl_queue_entry *entry = (struct nfqnl_queue_entry *)p; | |
249 | ||
250 | if (!cmpfn || cmpfn(entry, data)) | |
251 | return entry; | |
252 | } | |
253 | return NULL; | |
254 | } | |
255 | ||
256 | static inline void | |
257 | __dequeue_entry(struct nfqnl_instance *q, struct nfqnl_queue_entry *entry) | |
258 | { | |
259 | list_del(&entry->list); | |
260 | q->queue_total--; | |
261 | } | |
262 | ||
263 | static inline struct nfqnl_queue_entry * | |
264 | __find_dequeue_entry(struct nfqnl_instance *queue, | |
265 | nfqnl_cmpfn cmpfn, unsigned long data) | |
266 | { | |
267 | struct nfqnl_queue_entry *entry; | |
268 | ||
269 | entry = __find_entry(queue, cmpfn, data); | |
270 | if (entry == NULL) | |
271 | return NULL; | |
272 | ||
273 | __dequeue_entry(queue, entry); | |
274 | return entry; | |
275 | } | |
276 | ||
277 | ||
278 | static inline void | |
279 | __nfqnl_flush(struct nfqnl_instance *queue, int verdict) | |
280 | { | |
281 | struct nfqnl_queue_entry *entry; | |
282 | ||
283 | while ((entry = __find_dequeue_entry(queue, NULL, 0))) | |
284 | issue_verdict(entry, verdict); | |
285 | } | |
286 | ||
287 | static inline int | |
288 | __nfqnl_set_mode(struct nfqnl_instance *queue, | |
289 | unsigned char mode, unsigned int range) | |
290 | { | |
291 | int status = 0; | |
292 | ||
293 | switch (mode) { | |
294 | case NFQNL_COPY_NONE: | |
295 | case NFQNL_COPY_META: | |
296 | queue->copy_mode = mode; | |
297 | queue->copy_range = 0; | |
298 | break; | |
299 | ||
300 | case NFQNL_COPY_PACKET: | |
301 | queue->copy_mode = mode; | |
302 | /* we're using struct nfattr which has 16bit nfa_len */ | |
303 | if (range > 0xffff) | |
304 | queue->copy_range = 0xffff; | |
305 | else | |
306 | queue->copy_range = range; | |
307 | break; | |
308 | ||
309 | default: | |
310 | status = -EINVAL; | |
311 | ||
312 | } | |
313 | return status; | |
314 | } | |
315 | ||
316 | static struct nfqnl_queue_entry * | |
317 | find_dequeue_entry(struct nfqnl_instance *queue, | |
318 | nfqnl_cmpfn cmpfn, unsigned long data) | |
319 | { | |
320 | struct nfqnl_queue_entry *entry; | |
321 | ||
322 | spin_lock_bh(&queue->lock); | |
323 | entry = __find_dequeue_entry(queue, cmpfn, data); | |
324 | spin_unlock_bh(&queue->lock); | |
325 | ||
326 | return entry; | |
327 | } | |
328 | ||
329 | static void | |
330 | nfqnl_flush(struct nfqnl_instance *queue, int verdict) | |
331 | { | |
332 | spin_lock_bh(&queue->lock); | |
333 | __nfqnl_flush(queue, verdict); | |
334 | spin_unlock_bh(&queue->lock); | |
335 | } | |
336 | ||
337 | static struct sk_buff * | |
338 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
339 | struct nfqnl_queue_entry *entry, int *errp) | |
340 | { | |
341 | unsigned char *old_tail; | |
342 | size_t size; | |
343 | size_t data_len = 0; | |
344 | struct sk_buff *skb; | |
345 | struct nfqnl_msg_packet_hdr pmsg; | |
346 | struct nlmsghdr *nlh; | |
347 | struct nfgenmsg *nfmsg; | |
348 | unsigned int tmp_uint; | |
349 | ||
350 | QDEBUG("entered\n"); | |
351 | ||
352 | /* all macros expand to constant values at compile time */ | |
353 | size = NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hdr)) | |
354 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
355 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c HW |
356 | #ifdef CONFIG_BRIDGE_NETFILTER |
357 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
358 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
359 | #endif | |
7af4cc3f HW |
360 | + NLMSG_SPACE(sizeof(u_int32_t)) /* mark */ |
361 | + NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hw)) | |
362 | + NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_timestamp)); | |
363 | ||
364 | spin_lock_bh(&queue->lock); | |
365 | ||
366 | switch (queue->copy_mode) { | |
367 | case NFQNL_COPY_META: | |
368 | case NFQNL_COPY_NONE: | |
369 | data_len = 0; | |
370 | break; | |
371 | ||
372 | case NFQNL_COPY_PACKET: | |
e7dfb09a PM |
373 | if (entry->skb->ip_summed == CHECKSUM_HW && |
374 | (*errp = skb_checksum_help(entry->skb, | |
375 | entry->info->outdev == NULL))) { | |
376 | spin_unlock_bh(&queue->lock); | |
377 | return NULL; | |
378 | } | |
7af4cc3f HW |
379 | if (queue->copy_range == 0 |
380 | || queue->copy_range > entry->skb->len) | |
381 | data_len = entry->skb->len; | |
382 | else | |
383 | data_len = queue->copy_range; | |
384 | ||
385 | size += NLMSG_SPACE(data_len); | |
386 | break; | |
387 | ||
388 | default: | |
389 | *errp = -EINVAL; | |
390 | spin_unlock_bh(&queue->lock); | |
391 | return NULL; | |
392 | } | |
393 | ||
394 | spin_unlock_bh(&queue->lock); | |
395 | ||
396 | skb = alloc_skb(size, GFP_ATOMIC); | |
397 | if (!skb) | |
398 | goto nlmsg_failure; | |
399 | ||
400 | old_tail= skb->tail; | |
401 | nlh = NLMSG_PUT(skb, 0, 0, | |
402 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, | |
403 | sizeof(struct nfgenmsg)); | |
404 | nfmsg = NLMSG_DATA(nlh); | |
405 | nfmsg->nfgen_family = entry->info->pf; | |
406 | nfmsg->version = NFNETLINK_V0; | |
407 | nfmsg->res_id = htons(queue->queue_num); | |
408 | ||
409 | pmsg.packet_id = htonl(entry->id); | |
410 | pmsg.hw_protocol = htons(entry->skb->protocol); | |
411 | pmsg.hook = entry->info->hook; | |
412 | ||
413 | NFA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg); | |
414 | ||
415 | if (entry->info->indev) { | |
416 | tmp_uint = htonl(entry->info->indev->ifindex); | |
fbcd923c | 417 | #ifndef CONFIG_BRIDGE_NETFILTER |
7af4cc3f | 418 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c HW |
419 | #else |
420 | if (entry->info->pf == PF_BRIDGE) { | |
421 | /* Case 1: indev is physical input device, we need to | |
422 | * look for bridge group (when called from | |
423 | * netfilter_bridge) */ | |
424 | NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, sizeof(tmp_uint), | |
425 | &tmp_uint); | |
426 | /* this is the bridge group "brX" */ | |
427 | tmp_uint = htonl(entry->info->indev->br_port->br->dev->ifindex); | |
428 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), | |
429 | &tmp_uint); | |
430 | } else { | |
431 | /* Case 2: indev is bridge group, we need to look for | |
432 | * physical device (when called from ipv4) */ | |
433 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), | |
434 | &tmp_uint); | |
435 | if (entry->skb->nf_bridge | |
436 | && entry->skb->nf_bridge->physindev) { | |
437 | tmp_uint = htonl(entry->skb->nf_bridge->physindev->ifindex); | |
438 | NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, | |
439 | sizeof(tmp_uint), &tmp_uint); | |
440 | } | |
441 | } | |
442 | #endif | |
7af4cc3f HW |
443 | } |
444 | ||
445 | if (entry->info->outdev) { | |
446 | tmp_uint = htonl(entry->info->outdev->ifindex); | |
fbcd923c | 447 | #ifndef CONFIG_BRIDGE_NETFILTER |
7af4cc3f | 448 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c HW |
449 | #else |
450 | if (entry->info->pf == PF_BRIDGE) { | |
451 | /* Case 1: outdev is physical output device, we need to | |
452 | * look for bridge group (when called from | |
453 | * netfilter_bridge) */ | |
454 | NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, sizeof(tmp_uint), | |
455 | &tmp_uint); | |
456 | /* this is the bridge group "brX" */ | |
457 | tmp_uint = htonl(entry->info->outdev->br_port->br->dev->ifindex); | |
458 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), | |
459 | &tmp_uint); | |
460 | } else { | |
461 | /* Case 2: outdev is bridge group, we need to look for | |
462 | * physical output device (when called from ipv4) */ | |
463 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), | |
464 | &tmp_uint); | |
465 | if (entry->skb->nf_bridge | |
466 | && entry->skb->nf_bridge->physoutdev) { | |
467 | tmp_uint = htonl(entry->skb->nf_bridge->physoutdev->ifindex); | |
468 | NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
469 | sizeof(tmp_uint), &tmp_uint); | |
470 | } | |
471 | } | |
472 | #endif | |
7af4cc3f HW |
473 | } |
474 | ||
475 | if (entry->skb->nfmark) { | |
476 | tmp_uint = htonl(entry->skb->nfmark); | |
477 | NFA_PUT(skb, NFQA_MARK, sizeof(u_int32_t), &tmp_uint); | |
478 | } | |
479 | ||
480 | if (entry->info->indev && entry->skb->dev | |
481 | && entry->skb->dev->hard_header_parse) { | |
482 | struct nfqnl_msg_packet_hw phw; | |
483 | ||
484 | phw.hw_addrlen = | |
485 | entry->skb->dev->hard_header_parse(entry->skb, | |
486 | phw.hw_addr); | |
487 | phw.hw_addrlen = htons(phw.hw_addrlen); | |
488 | NFA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); | |
489 | } | |
490 | ||
a61bbcf2 | 491 | if (entry->skb->tstamp.off_sec) { |
7af4cc3f HW |
492 | struct nfqnl_msg_packet_timestamp ts; |
493 | ||
325ed823 HX |
494 | ts.sec = cpu_to_be64(entry->skb->tstamp.off_sec); |
495 | ts.usec = cpu_to_be64(entry->skb->tstamp.off_usec); | |
7af4cc3f HW |
496 | |
497 | NFA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts); | |
498 | } | |
499 | ||
500 | if (data_len) { | |
501 | struct nfattr *nfa; | |
502 | int size = NFA_LENGTH(data_len); | |
503 | ||
504 | if (skb_tailroom(skb) < (int)NFA_SPACE(data_len)) { | |
505 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); | |
506 | goto nlmsg_failure; | |
507 | } | |
508 | ||
509 | nfa = (struct nfattr *)skb_put(skb, NFA_ALIGN(size)); | |
510 | nfa->nfa_type = NFQA_PAYLOAD; | |
511 | nfa->nfa_len = size; | |
512 | ||
513 | if (skb_copy_bits(entry->skb, 0, NFA_DATA(nfa), data_len)) | |
514 | BUG(); | |
515 | } | |
516 | ||
517 | nlh->nlmsg_len = skb->tail - old_tail; | |
518 | return skb; | |
519 | ||
520 | nlmsg_failure: | |
521 | nfattr_failure: | |
522 | if (skb) | |
523 | kfree_skb(skb); | |
524 | *errp = -EINVAL; | |
525 | if (net_ratelimit()) | |
526 | printk(KERN_ERR "nf_queue: error creating packet message\n"); | |
527 | return NULL; | |
528 | } | |
529 | ||
530 | static int | |
531 | nfqnl_enqueue_packet(struct sk_buff *skb, struct nf_info *info, | |
532 | unsigned int queuenum, void *data) | |
533 | { | |
534 | int status = -EINVAL; | |
535 | struct sk_buff *nskb; | |
536 | struct nfqnl_instance *queue; | |
537 | struct nfqnl_queue_entry *entry; | |
538 | ||
539 | QDEBUG("entered\n"); | |
540 | ||
838ab636 | 541 | queue = instance_lookup_get(queuenum); |
7af4cc3f HW |
542 | if (!queue) { |
543 | QDEBUG("no queue instance matching\n"); | |
544 | return -EINVAL; | |
545 | } | |
546 | ||
547 | if (queue->copy_mode == NFQNL_COPY_NONE) { | |
548 | QDEBUG("mode COPY_NONE, aborting\n"); | |
838ab636 HW |
549 | status = -EAGAIN; |
550 | goto err_out_put; | |
7af4cc3f HW |
551 | } |
552 | ||
553 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
554 | if (entry == NULL) { | |
555 | if (net_ratelimit()) | |
556 | printk(KERN_ERR | |
557 | "nf_queue: OOM in nfqnl_enqueue_packet()\n"); | |
838ab636 HW |
558 | status = -ENOMEM; |
559 | goto err_out_put; | |
7af4cc3f HW |
560 | } |
561 | ||
562 | entry->info = info; | |
563 | entry->skb = skb; | |
564 | entry->id = atomic_inc_return(&queue->id_sequence); | |
565 | ||
566 | nskb = nfqnl_build_packet_message(queue, entry, &status); | |
567 | if (nskb == NULL) | |
568 | goto err_out_free; | |
569 | ||
570 | spin_lock_bh(&queue->lock); | |
571 | ||
572 | if (!queue->peer_pid) | |
573 | goto err_out_free_nskb; | |
574 | ||
575 | if (queue->queue_total >= queue->queue_maxlen) { | |
576 | queue->queue_dropped++; | |
577 | status = -ENOSPC; | |
578 | if (net_ratelimit()) | |
579 | printk(KERN_WARNING "ip_queue: full at %d entries, " | |
580 | "dropping packets(s). Dropped: %d\n", | |
581 | queue->queue_total, queue->queue_dropped); | |
582 | goto err_out_free_nskb; | |
583 | } | |
584 | ||
585 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
586 | status = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT); | |
587 | if (status < 0) { | |
588 | queue->queue_user_dropped++; | |
589 | goto err_out_unlock; | |
590 | } | |
591 | ||
592 | __enqueue_entry(queue, entry); | |
593 | ||
594 | spin_unlock_bh(&queue->lock); | |
838ab636 | 595 | instance_put(queue); |
7af4cc3f HW |
596 | return status; |
597 | ||
598 | err_out_free_nskb: | |
599 | kfree_skb(nskb); | |
600 | ||
601 | err_out_unlock: | |
602 | spin_unlock_bh(&queue->lock); | |
603 | ||
604 | err_out_free: | |
605 | kfree(entry); | |
838ab636 HW |
606 | err_out_put: |
607 | instance_put(queue); | |
7af4cc3f HW |
608 | return status; |
609 | } | |
610 | ||
611 | static int | |
612 | nfqnl_mangle(void *data, int data_len, struct nfqnl_queue_entry *e) | |
613 | { | |
614 | int diff; | |
615 | ||
616 | diff = data_len - e->skb->len; | |
617 | if (diff < 0) | |
618 | skb_trim(e->skb, data_len); | |
619 | else if (diff > 0) { | |
620 | if (data_len > 0xFFFF) | |
621 | return -EINVAL; | |
622 | if (diff > skb_tailroom(e->skb)) { | |
623 | struct sk_buff *newskb; | |
624 | ||
625 | newskb = skb_copy_expand(e->skb, | |
626 | skb_headroom(e->skb), | |
627 | diff, | |
628 | GFP_ATOMIC); | |
629 | if (newskb == NULL) { | |
630 | printk(KERN_WARNING "ip_queue: OOM " | |
631 | "in mangle, dropping packet\n"); | |
632 | return -ENOMEM; | |
633 | } | |
634 | if (e->skb->sk) | |
635 | skb_set_owner_w(newskb, e->skb->sk); | |
636 | kfree_skb(e->skb); | |
637 | e->skb = newskb; | |
638 | } | |
639 | skb_put(e->skb, diff); | |
640 | } | |
641 | if (!skb_make_writable(&e->skb, data_len)) | |
642 | return -ENOMEM; | |
643 | memcpy(e->skb->data, data, data_len); | |
e7dfb09a | 644 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
645 | return 0; |
646 | } | |
647 | ||
648 | static inline int | |
649 | id_cmp(struct nfqnl_queue_entry *e, unsigned long id) | |
650 | { | |
651 | return (id == e->id); | |
652 | } | |
653 | ||
654 | static int | |
655 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
656 | unsigned char mode, unsigned int range) | |
657 | { | |
658 | int status; | |
659 | ||
660 | spin_lock_bh(&queue->lock); | |
661 | status = __nfqnl_set_mode(queue, mode, range); | |
662 | spin_unlock_bh(&queue->lock); | |
663 | ||
664 | return status; | |
665 | } | |
666 | ||
667 | static int | |
668 | dev_cmp(struct nfqnl_queue_entry *entry, unsigned long ifindex) | |
669 | { | |
670 | if (entry->info->indev) | |
671 | if (entry->info->indev->ifindex == ifindex) | |
672 | return 1; | |
673 | ||
674 | if (entry->info->outdev) | |
675 | if (entry->info->outdev->ifindex == ifindex) | |
676 | return 1; | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
681 | /* drop all packets with either indev or outdev == ifindex from all queue | |
682 | * instances */ | |
683 | static void | |
684 | nfqnl_dev_drop(int ifindex) | |
685 | { | |
686 | int i; | |
687 | ||
688 | QDEBUG("entering for ifindex %u\n", ifindex); | |
689 | ||
690 | /* this only looks like we have to hold the readlock for a way too long | |
691 | * time, issue_verdict(), nf_reinject(), ... - but we always only | |
692 | * issue NF_DROP, which is processed directly in nf_reinject() */ | |
693 | read_lock_bh(&instances_lock); | |
694 | ||
695 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
696 | struct hlist_node *tmp; | |
697 | struct nfqnl_instance *inst; | |
698 | struct hlist_head *head = &instance_table[i]; | |
699 | ||
700 | hlist_for_each_entry(inst, tmp, head, hlist) { | |
701 | struct nfqnl_queue_entry *entry; | |
702 | while ((entry = find_dequeue_entry(inst, dev_cmp, | |
703 | ifindex)) != NULL) | |
704 | issue_verdict(entry, NF_DROP); | |
705 | } | |
706 | } | |
707 | ||
708 | read_unlock_bh(&instances_lock); | |
709 | } | |
710 | ||
711 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
712 | ||
713 | static int | |
714 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
715 | unsigned long event, void *ptr) | |
716 | { | |
717 | struct net_device *dev = ptr; | |
718 | ||
719 | /* Drop any packets associated with the downed device */ | |
720 | if (event == NETDEV_DOWN) | |
721 | nfqnl_dev_drop(dev->ifindex); | |
722 | return NOTIFY_DONE; | |
723 | } | |
724 | ||
725 | static struct notifier_block nfqnl_dev_notifier = { | |
726 | .notifier_call = nfqnl_rcv_dev_event, | |
727 | }; | |
728 | ||
729 | static int | |
730 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
731 | unsigned long event, void *ptr) | |
732 | { | |
733 | struct netlink_notify *n = ptr; | |
734 | ||
735 | if (event == NETLINK_URELEASE && | |
736 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
737 | int i; | |
738 | ||
739 | /* destroy all instances for this pid */ | |
740 | write_lock_bh(&instances_lock); | |
741 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
742 | struct hlist_node *tmp, *t2; | |
743 | struct nfqnl_instance *inst; | |
744 | struct hlist_head *head = &instance_table[i]; | |
745 | ||
746 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
747 | if (n->pid == inst->peer_pid) | |
748 | __instance_destroy(inst); | |
749 | } | |
750 | } | |
751 | write_unlock_bh(&instances_lock); | |
752 | } | |
753 | return NOTIFY_DONE; | |
754 | } | |
755 | ||
756 | static struct notifier_block nfqnl_rtnl_notifier = { | |
757 | .notifier_call = nfqnl_rcv_nl_event, | |
758 | }; | |
759 | ||
838ab636 HW |
760 | static const int nfqa_verdict_min[NFQA_MAX] = { |
761 | [NFQA_VERDICT_HDR-1] = sizeof(struct nfqnl_msg_verdict_hdr), | |
762 | [NFQA_MARK-1] = sizeof(u_int32_t), | |
763 | [NFQA_PAYLOAD-1] = 0, | |
764 | }; | |
765 | ||
7af4cc3f HW |
766 | static int |
767 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
768 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) | |
769 | { | |
770 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
771 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
772 | ||
773 | struct nfqnl_msg_verdict_hdr *vhdr; | |
774 | struct nfqnl_instance *queue; | |
775 | unsigned int verdict; | |
776 | struct nfqnl_queue_entry *entry; | |
838ab636 | 777 | int err; |
7af4cc3f | 778 | |
838ab636 HW |
779 | if (nfattr_bad_size(nfqa, NFQA_MAX, nfqa_verdict_min)) { |
780 | QDEBUG("bad attribute size\n"); | |
781 | return -EINVAL; | |
782 | } | |
783 | ||
784 | queue = instance_lookup_get(queue_num); | |
7af4cc3f HW |
785 | if (!queue) |
786 | return -ENODEV; | |
787 | ||
838ab636 HW |
788 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
789 | err = -EPERM; | |
790 | goto err_out_put; | |
791 | } | |
7af4cc3f | 792 | |
838ab636 HW |
793 | if (!nfqa[NFQA_VERDICT_HDR-1]) { |
794 | err = -EINVAL; | |
795 | goto err_out_put; | |
796 | } | |
7af4cc3f HW |
797 | |
798 | vhdr = NFA_DATA(nfqa[NFQA_VERDICT_HDR-1]); | |
799 | verdict = ntohl(vhdr->verdict); | |
800 | ||
838ab636 HW |
801 | if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) { |
802 | err = -EINVAL; | |
803 | goto err_out_put; | |
804 | } | |
7af4cc3f HW |
805 | |
806 | entry = find_dequeue_entry(queue, id_cmp, ntohl(vhdr->id)); | |
838ab636 HW |
807 | if (entry == NULL) { |
808 | err = -ENOENT; | |
809 | goto err_out_put; | |
810 | } | |
7af4cc3f HW |
811 | |
812 | if (nfqa[NFQA_PAYLOAD-1]) { | |
813 | if (nfqnl_mangle(NFA_DATA(nfqa[NFQA_PAYLOAD-1]), | |
814 | NFA_PAYLOAD(nfqa[NFQA_PAYLOAD-1]), entry) < 0) | |
815 | verdict = NF_DROP; | |
816 | } | |
817 | ||
818 | if (nfqa[NFQA_MARK-1]) | |
819 | skb->nfmark = ntohl(*(u_int32_t *)NFA_DATA(nfqa[NFQA_MARK-1])); | |
820 | ||
821 | issue_verdict(entry, verdict); | |
838ab636 | 822 | instance_put(queue); |
7af4cc3f | 823 | return 0; |
838ab636 HW |
824 | |
825 | err_out_put: | |
826 | instance_put(queue); | |
827 | return err; | |
7af4cc3f HW |
828 | } |
829 | ||
830 | static int | |
831 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
832 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) | |
833 | { | |
834 | return -ENOTSUPP; | |
835 | } | |
836 | ||
838ab636 HW |
837 | static const int nfqa_cfg_min[NFQA_CFG_MAX] = { |
838 | [NFQA_CFG_CMD-1] = sizeof(struct nfqnl_msg_config_cmd), | |
839 | [NFQA_CFG_PARAMS-1] = sizeof(struct nfqnl_msg_config_params), | |
840 | }; | |
841 | ||
bbd86b9f HW |
842 | static struct nf_queue_handler nfqh = { |
843 | .name = "nf_queue", | |
844 | .outfn = &nfqnl_enqueue_packet, | |
845 | }; | |
846 | ||
7af4cc3f HW |
847 | static int |
848 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
849 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) | |
850 | { | |
851 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
852 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
853 | struct nfqnl_instance *queue; | |
838ab636 | 854 | int ret = 0; |
7af4cc3f HW |
855 | |
856 | QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); | |
857 | ||
838ab636 HW |
858 | if (nfattr_bad_size(nfqa, NFQA_CFG_MAX, nfqa_cfg_min)) { |
859 | QDEBUG("bad attribute size\n"); | |
860 | return -EINVAL; | |
861 | } | |
862 | ||
863 | queue = instance_lookup_get(queue_num); | |
7af4cc3f HW |
864 | if (nfqa[NFQA_CFG_CMD-1]) { |
865 | struct nfqnl_msg_config_cmd *cmd; | |
866 | cmd = NFA_DATA(nfqa[NFQA_CFG_CMD-1]); | |
867 | QDEBUG("found CFG_CMD\n"); | |
868 | ||
869 | switch (cmd->command) { | |
870 | case NFQNL_CFG_CMD_BIND: | |
871 | if (queue) | |
872 | return -EBUSY; | |
873 | ||
874 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); | |
875 | if (!queue) | |
876 | return -EINVAL; | |
877 | break; | |
878 | case NFQNL_CFG_CMD_UNBIND: | |
879 | if (!queue) | |
880 | return -ENODEV; | |
881 | ||
838ab636 HW |
882 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
883 | ret = -EPERM; | |
884 | goto out_put; | |
885 | } | |
7af4cc3f HW |
886 | |
887 | instance_destroy(queue); | |
888 | break; | |
889 | case NFQNL_CFG_CMD_PF_BIND: | |
890 | QDEBUG("registering queue handler for pf=%u\n", | |
891 | ntohs(cmd->pf)); | |
bbd86b9f | 892 | ret = nf_register_queue_handler(ntohs(cmd->pf), &nfqh); |
7af4cc3f HW |
893 | break; |
894 | case NFQNL_CFG_CMD_PF_UNBIND: | |
895 | QDEBUG("unregistering queue handler for pf=%u\n", | |
896 | ntohs(cmd->pf)); | |
897 | /* This is a bug and a feature. We can unregister | |
898 | * other handlers(!) */ | |
838ab636 | 899 | ret = nf_unregister_queue_handler(ntohs(cmd->pf)); |
7af4cc3f HW |
900 | break; |
901 | default: | |
838ab636 HW |
902 | ret = -EINVAL; |
903 | break; | |
7af4cc3f HW |
904 | } |
905 | } else { | |
906 | if (!queue) { | |
907 | QDEBUG("no config command, and no instance ENOENT\n"); | |
838ab636 HW |
908 | ret = -ENOENT; |
909 | goto out_put; | |
7af4cc3f HW |
910 | } |
911 | ||
912 | if (queue->peer_pid != NETLINK_CB(skb).pid) { | |
913 | QDEBUG("no config command, and wrong pid\n"); | |
838ab636 HW |
914 | ret = -EPERM; |
915 | goto out_put; | |
7af4cc3f HW |
916 | } |
917 | } | |
918 | ||
919 | if (nfqa[NFQA_CFG_PARAMS-1]) { | |
920 | struct nfqnl_msg_config_params *params; | |
921 | params = NFA_DATA(nfqa[NFQA_CFG_PARAMS-1]); | |
922 | ||
923 | nfqnl_set_mode(queue, params->copy_mode, | |
924 | ntohl(params->copy_range)); | |
925 | } | |
926 | ||
838ab636 HW |
927 | out_put: |
928 | instance_put(queue); | |
929 | return ret; | |
7af4cc3f HW |
930 | } |
931 | ||
932 | static struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { | |
933 | [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp, | |
37d2e7a2 | 934 | .attr_count = NFQA_MAX, }, |
7af4cc3f | 935 | [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict, |
37d2e7a2 | 936 | .attr_count = NFQA_MAX, }, |
7af4cc3f | 937 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
37d2e7a2 | 938 | .attr_count = NFQA_CFG_MAX, }, |
7af4cc3f HW |
939 | }; |
940 | ||
941 | static struct nfnetlink_subsystem nfqnl_subsys = { | |
942 | .name = "nf_queue", | |
943 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
944 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
945 | .cb = nfqnl_cb, |
946 | }; | |
947 | ||
838ab636 HW |
948 | #ifdef CONFIG_PROC_FS |
949 | struct iter_state { | |
950 | unsigned int bucket; | |
951 | }; | |
952 | ||
953 | static struct hlist_node *get_first(struct seq_file *seq) | |
954 | { | |
955 | struct iter_state *st = seq->private; | |
956 | ||
957 | if (!st) | |
958 | return NULL; | |
959 | ||
960 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
961 | if (!hlist_empty(&instance_table[st->bucket])) | |
962 | return instance_table[st->bucket].first; | |
963 | } | |
964 | return NULL; | |
965 | } | |
966 | ||
967 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
968 | { | |
969 | struct iter_state *st = seq->private; | |
970 | ||
971 | h = h->next; | |
972 | while (!h) { | |
973 | if (++st->bucket >= INSTANCE_BUCKETS) | |
974 | return NULL; | |
975 | ||
976 | h = instance_table[st->bucket].first; | |
977 | } | |
978 | return h; | |
979 | } | |
980 | ||
981 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
982 | { | |
983 | struct hlist_node *head; | |
984 | head = get_first(seq); | |
985 | ||
986 | if (head) | |
987 | while (pos && (head = get_next(seq, head))) | |
988 | pos--; | |
989 | return pos ? NULL : head; | |
990 | } | |
991 | ||
992 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
993 | { | |
994 | read_lock_bh(&instances_lock); | |
995 | return get_idx(seq, *pos); | |
996 | } | |
997 | ||
998 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
999 | { | |
1000 | (*pos)++; | |
1001 | return get_next(s, v); | |
1002 | } | |
1003 | ||
1004 | static void seq_stop(struct seq_file *s, void *v) | |
1005 | { | |
1006 | read_unlock_bh(&instances_lock); | |
1007 | } | |
1008 | ||
1009 | static int seq_show(struct seq_file *s, void *v) | |
1010 | { | |
1011 | const struct nfqnl_instance *inst = v; | |
1012 | ||
1013 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1014 | inst->queue_num, | |
1015 | inst->peer_pid, inst->queue_total, | |
1016 | inst->copy_mode, inst->copy_range, | |
1017 | inst->queue_dropped, inst->queue_user_dropped, | |
1018 | atomic_read(&inst->id_sequence), | |
1019 | atomic_read(&inst->use)); | |
1020 | } | |
1021 | ||
1022 | static struct seq_operations nfqnl_seq_ops = { | |
1023 | .start = seq_start, | |
1024 | .next = seq_next, | |
1025 | .stop = seq_stop, | |
1026 | .show = seq_show, | |
1027 | }; | |
1028 | ||
1029 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1030 | { | |
1031 | struct seq_file *seq; | |
1032 | struct iter_state *is; | |
1033 | int ret; | |
1034 | ||
10dfdc69 | 1035 | is = kzalloc(sizeof(*is), GFP_KERNEL); |
838ab636 HW |
1036 | if (!is) |
1037 | return -ENOMEM; | |
838ab636 HW |
1038 | ret = seq_open(file, &nfqnl_seq_ops); |
1039 | if (ret < 0) | |
1040 | goto out_free; | |
1041 | seq = file->private_data; | |
1042 | seq->private = is; | |
1043 | return ret; | |
1044 | out_free: | |
1045 | kfree(is); | |
1046 | return ret; | |
1047 | } | |
1048 | ||
1049 | static struct file_operations nfqnl_file_ops = { | |
1050 | .owner = THIS_MODULE, | |
1051 | .open = nfqnl_open, | |
1052 | .read = seq_read, | |
1053 | .llseek = seq_lseek, | |
1054 | .release = seq_release_private, | |
1055 | }; | |
1056 | ||
1057 | #endif /* PROC_FS */ | |
1058 | ||
7af4cc3f HW |
1059 | static int |
1060 | init_or_cleanup(int init) | |
1061 | { | |
838ab636 HW |
1062 | int i, status = -ENOMEM; |
1063 | #ifdef CONFIG_PROC_FS | |
1064 | struct proc_dir_entry *proc_nfqueue; | |
1065 | #endif | |
7af4cc3f HW |
1066 | |
1067 | if (!init) | |
1068 | goto cleanup; | |
1069 | ||
838ab636 HW |
1070 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1071 | INIT_HLIST_HEAD(&instance_table[i]); | |
1072 | ||
7af4cc3f HW |
1073 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1074 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1075 | if (status < 0) { | |
1076 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
1077 | goto cleanup_netlink_notifier; | |
1078 | } | |
1079 | ||
838ab636 HW |
1080 | #ifdef CONFIG_PROC_FS |
1081 | proc_nfqueue = create_proc_entry("nfnetlink_queue", 0440, | |
1082 | proc_net_netfilter); | |
1083 | if (!proc_nfqueue) | |
1084 | goto cleanup_subsys; | |
1085 | proc_nfqueue->proc_fops = &nfqnl_file_ops; | |
1086 | #endif | |
1087 | ||
7af4cc3f | 1088 | register_netdevice_notifier(&nfqnl_dev_notifier); |
838ab636 | 1089 | |
7af4cc3f HW |
1090 | return status; |
1091 | ||
1092 | cleanup: | |
bbd86b9f | 1093 | nf_unregister_queue_handlers(&nfqh); |
7af4cc3f | 1094 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
838ab636 | 1095 | #ifdef CONFIG_PROC_FS |
0597f268 | 1096 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); |
838ab636 HW |
1097 | cleanup_subsys: |
1098 | #endif | |
7af4cc3f | 1099 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
7af4cc3f HW |
1100 | cleanup_netlink_notifier: |
1101 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1102 | return status; | |
1103 | } | |
1104 | ||
1105 | static int __init init(void) | |
1106 | { | |
1107 | ||
1108 | return init_or_cleanup(1); | |
1109 | } | |
1110 | ||
1111 | static void __exit fini(void) | |
1112 | { | |
1113 | init_or_cleanup(0); | |
1114 | } | |
1115 | ||
1116 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1117 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1118 | MODULE_LICENSE("GPL"); | |
1119 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1120 | ||
1121 | module_init(init); | |
1122 | module_exit(fini); |