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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 | ||
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 | ||
601e68e1 | 132 | write_lock_bh(&instances_lock); |
7af4cc3f HW |
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 | ||
601e68e1 | 157 | hlist_add_head(&inst->hlist, |
7af4cc3f HW |
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 * | |
601e68e1 | 242 | __find_entry(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
7af4cc3f HW |
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; | |
601e68e1 | 249 | |
7af4cc3f HW |
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; | |
601e68e1 | 282 | |
7af4cc3f HW |
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; | |
601e68e1 | 292 | |
7af4cc3f HW |
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; | |
601e68e1 | 299 | |
7af4cc3f HW |
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; | |
601e68e1 | 308 | |
7af4cc3f HW |
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; | |
601e68e1 | 321 | |
7af4cc3f HW |
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 | { | |
27a884dc | 341 | sk_buff_data_t old_tail; |
7af4cc3f HW |
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; | |
3e4ead4f JJ |
348 | struct nf_info *entinf = entry->info; |
349 | struct sk_buff *entskb = entry->skb; | |
350 | struct net_device *indev; | |
351 | struct net_device *outdev; | |
98a4a861 | 352 | __be32 tmp_uint; |
7af4cc3f HW |
353 | |
354 | QDEBUG("entered\n"); | |
355 | ||
356 | /* all macros expand to constant values at compile time */ | |
f0d83583 PNA |
357 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) + |
358 | + NFA_SPACE(sizeof(struct nfqnl_msg_packet_hdr)) | |
359 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
360 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 361 | #ifdef CONFIG_BRIDGE_NETFILTER |
f0d83583 PNA |
362 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ |
363 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 364 | #endif |
f0d83583 PNA |
365 | + NFA_SPACE(sizeof(u_int32_t)) /* mark */ |
366 | + NFA_SPACE(sizeof(struct nfqnl_msg_packet_hw)) | |
367 | + NFA_SPACE(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 368 | |
3e4ead4f JJ |
369 | outdev = entinf->outdev; |
370 | ||
7af4cc3f | 371 | spin_lock_bh(&queue->lock); |
601e68e1 | 372 | |
7af4cc3f HW |
373 | switch (queue->copy_mode) { |
374 | case NFQNL_COPY_META: | |
375 | case NFQNL_COPY_NONE: | |
376 | data_len = 0; | |
377 | break; | |
601e68e1 | 378 | |
7af4cc3f | 379 | case NFQNL_COPY_PACKET: |
84fa7933 PM |
380 | if ((entskb->ip_summed == CHECKSUM_PARTIAL || |
381 | entskb->ip_summed == CHECKSUM_COMPLETE) && | |
382 | (*errp = skb_checksum_help(entskb))) { | |
e7dfb09a PM |
383 | spin_unlock_bh(&queue->lock); |
384 | return NULL; | |
385 | } | |
601e68e1 | 386 | if (queue->copy_range == 0 |
3e4ead4f JJ |
387 | || queue->copy_range > entskb->len) |
388 | data_len = entskb->len; | |
7af4cc3f HW |
389 | else |
390 | data_len = queue->copy_range; | |
601e68e1 | 391 | |
f0d83583 | 392 | size += NFA_SPACE(data_len); |
7af4cc3f | 393 | break; |
601e68e1 | 394 | |
7af4cc3f HW |
395 | default: |
396 | *errp = -EINVAL; | |
397 | spin_unlock_bh(&queue->lock); | |
398 | return NULL; | |
399 | } | |
400 | ||
401 | spin_unlock_bh(&queue->lock); | |
402 | ||
403 | skb = alloc_skb(size, GFP_ATOMIC); | |
404 | if (!skb) | |
405 | goto nlmsg_failure; | |
601e68e1 | 406 | |
27a884dc | 407 | old_tail = skb->tail; |
601e68e1 | 408 | nlh = NLMSG_PUT(skb, 0, 0, |
7af4cc3f HW |
409 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
410 | sizeof(struct nfgenmsg)); | |
411 | nfmsg = NLMSG_DATA(nlh); | |
3e4ead4f | 412 | nfmsg->nfgen_family = entinf->pf; |
7af4cc3f HW |
413 | nfmsg->version = NFNETLINK_V0; |
414 | nfmsg->res_id = htons(queue->queue_num); | |
415 | ||
416 | pmsg.packet_id = htonl(entry->id); | |
febf0a43 | 417 | pmsg.hw_protocol = entskb->protocol; |
3e4ead4f | 418 | pmsg.hook = entinf->hook; |
7af4cc3f HW |
419 | |
420 | NFA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg); | |
421 | ||
3e4ead4f JJ |
422 | indev = entinf->indev; |
423 | if (indev) { | |
424 | tmp_uint = htonl(indev->ifindex); | |
fbcd923c | 425 | #ifndef CONFIG_BRIDGE_NETFILTER |
7af4cc3f | 426 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c | 427 | #else |
3e4ead4f | 428 | if (entinf->pf == PF_BRIDGE) { |
fbcd923c | 429 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 430 | * look for bridge group (when called from |
fbcd923c | 431 | * netfilter_bridge) */ |
601e68e1 | 432 | NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, sizeof(tmp_uint), |
fbcd923c HW |
433 | &tmp_uint); |
434 | /* this is the bridge group "brX" */ | |
3e4ead4f | 435 | tmp_uint = htonl(indev->br_port->br->dev->ifindex); |
fbcd923c HW |
436 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), |
437 | &tmp_uint); | |
438 | } else { | |
439 | /* Case 2: indev is bridge group, we need to look for | |
440 | * physical device (when called from ipv4) */ | |
441 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), | |
442 | &tmp_uint); | |
3e4ead4f JJ |
443 | if (entskb->nf_bridge |
444 | && entskb->nf_bridge->physindev) { | |
445 | tmp_uint = htonl(entskb->nf_bridge->physindev->ifindex); | |
fbcd923c HW |
446 | NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, |
447 | sizeof(tmp_uint), &tmp_uint); | |
448 | } | |
449 | } | |
450 | #endif | |
7af4cc3f HW |
451 | } |
452 | ||
3e4ead4f JJ |
453 | if (outdev) { |
454 | tmp_uint = htonl(outdev->ifindex); | |
fbcd923c | 455 | #ifndef CONFIG_BRIDGE_NETFILTER |
7af4cc3f | 456 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c | 457 | #else |
3e4ead4f | 458 | if (entinf->pf == PF_BRIDGE) { |
fbcd923c | 459 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 460 | * look for bridge group (when called from |
fbcd923c HW |
461 | * netfilter_bridge) */ |
462 | NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, sizeof(tmp_uint), | |
463 | &tmp_uint); | |
464 | /* this is the bridge group "brX" */ | |
3e4ead4f | 465 | tmp_uint = htonl(outdev->br_port->br->dev->ifindex); |
fbcd923c HW |
466 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
467 | &tmp_uint); | |
468 | } else { | |
469 | /* Case 2: outdev is bridge group, we need to look for | |
470 | * physical output device (when called from ipv4) */ | |
471 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), | |
472 | &tmp_uint); | |
3e4ead4f JJ |
473 | if (entskb->nf_bridge |
474 | && entskb->nf_bridge->physoutdev) { | |
475 | tmp_uint = htonl(entskb->nf_bridge->physoutdev->ifindex); | |
fbcd923c HW |
476 | NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, |
477 | sizeof(tmp_uint), &tmp_uint); | |
478 | } | |
479 | } | |
480 | #endif | |
7af4cc3f HW |
481 | } |
482 | ||
82e91ffe TG |
483 | if (entskb->mark) { |
484 | tmp_uint = htonl(entskb->mark); | |
7af4cc3f HW |
485 | NFA_PUT(skb, NFQA_MARK, sizeof(u_int32_t), &tmp_uint); |
486 | } | |
487 | ||
b95cce35 | 488 | if (indev && entskb->dev) { |
7af4cc3f | 489 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
490 | int len = dev_parse_header(entskb, phw.hw_addr); |
491 | if (len) { | |
492 | phw.hw_addrlen = htons(len); | |
493 | NFA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); | |
494 | } | |
7af4cc3f HW |
495 | } |
496 | ||
b7aa0bf7 | 497 | if (entskb->tstamp.tv64) { |
7af4cc3f | 498 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
499 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
500 | ts.sec = cpu_to_be64(tv.tv_sec); | |
501 | ts.usec = cpu_to_be64(tv.tv_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 | ||
3e4ead4f | 519 | if (skb_copy_bits(entskb, 0, NFA_DATA(nfa), data_len)) |
7af4cc3f HW |
520 | BUG(); |
521 | } | |
601e68e1 | 522 | |
7af4cc3f HW |
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 | |
601e68e1 | 537 | nfqnl_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
7af4cc3f HW |
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()) | |
601e68e1 | 562 | printk(KERN_ERR |
7af4cc3f | 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; | |
601e68e1 | 575 | |
7af4cc3f | 576 | spin_lock_bh(&queue->lock); |
601e68e1 | 577 | |
7af4cc3f | 578 | if (!queue->peer_pid) |
601e68e1 | 579 | goto err_out_free_nskb; |
7af4cc3f HW |
580 | |
581 | if (queue->queue_total >= queue->queue_maxlen) { | |
601e68e1 | 582 | queue->queue_dropped++; |
7af4cc3f HW |
583 | status = -ENOSPC; |
584 | if (net_ratelimit()) | |
601e68e1 YH |
585 | printk(KERN_WARNING "nf_queue: full at %d entries, " |
586 | "dropping packets(s). Dropped: %d\n", | |
7af4cc3f HW |
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) { | |
601e68e1 | 594 | queue->queue_user_dropped++; |
7af4cc3f HW |
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: | |
601e68e1 YH |
605 | kfree_skb(nskb); |
606 | ||
7af4cc3f HW |
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; | |
d8a585d7 PM |
623 | if (diff < 0) { |
624 | if (pskb_trim(e->skb, data_len)) | |
625 | return -ENOMEM; | |
626 | } else if (diff > 0) { | |
7af4cc3f HW |
627 | if (data_len > 0xFFFF) |
628 | return -EINVAL; | |
629 | if (diff > skb_tailroom(e->skb)) { | |
630 | struct sk_buff *newskb; | |
601e68e1 | 631 | |
7af4cc3f | 632 | newskb = skb_copy_expand(e->skb, |
601e68e1 YH |
633 | skb_headroom(e->skb), |
634 | diff, | |
635 | GFP_ATOMIC); | |
7af4cc3f | 636 | if (newskb == NULL) { |
1158ba27 | 637 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f HW |
638 | "in mangle, dropping packet\n"); |
639 | return -ENOMEM; | |
640 | } | |
641 | if (e->skb->sk) | |
642 | skb_set_owner_w(newskb, e->skb->sk); | |
643 | kfree_skb(e->skb); | |
644 | e->skb = newskb; | |
645 | } | |
646 | skb_put(e->skb, diff); | |
647 | } | |
648 | if (!skb_make_writable(&e->skb, data_len)) | |
649 | return -ENOMEM; | |
27d7ff46 | 650 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 651 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
652 | return 0; |
653 | } | |
654 | ||
655 | static inline int | |
656 | id_cmp(struct nfqnl_queue_entry *e, unsigned long id) | |
657 | { | |
658 | return (id == e->id); | |
659 | } | |
660 | ||
661 | static int | |
662 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
663 | unsigned char mode, unsigned int range) | |
664 | { | |
665 | int status; | |
666 | ||
667 | spin_lock_bh(&queue->lock); | |
668 | status = __nfqnl_set_mode(queue, mode, range); | |
669 | spin_unlock_bh(&queue->lock); | |
670 | ||
671 | return status; | |
672 | } | |
673 | ||
674 | static int | |
675 | dev_cmp(struct nfqnl_queue_entry *entry, unsigned long ifindex) | |
676 | { | |
3e4ead4f | 677 | struct nf_info *entinf = entry->info; |
601e68e1 | 678 | |
3e4ead4f JJ |
679 | if (entinf->indev) |
680 | if (entinf->indev->ifindex == ifindex) | |
7af4cc3f | 681 | return 1; |
3e4ead4f JJ |
682 | if (entinf->outdev) |
683 | if (entinf->outdev->ifindex == ifindex) | |
7af4cc3f | 684 | return 1; |
ef47c6a7 PM |
685 | #ifdef CONFIG_BRIDGE_NETFILTER |
686 | if (entry->skb->nf_bridge) { | |
687 | if (entry->skb->nf_bridge->physindev && | |
688 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
689 | return 1; | |
690 | if (entry->skb->nf_bridge->physoutdev && | |
691 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
692 | return 1; | |
693 | } | |
694 | #endif | |
7af4cc3f HW |
695 | return 0; |
696 | } | |
697 | ||
698 | /* drop all packets with either indev or outdev == ifindex from all queue | |
699 | * instances */ | |
700 | static void | |
701 | nfqnl_dev_drop(int ifindex) | |
702 | { | |
703 | int i; | |
601e68e1 | 704 | |
7af4cc3f HW |
705 | QDEBUG("entering for ifindex %u\n", ifindex); |
706 | ||
707 | /* this only looks like we have to hold the readlock for a way too long | |
708 | * time, issue_verdict(), nf_reinject(), ... - but we always only | |
709 | * issue NF_DROP, which is processed directly in nf_reinject() */ | |
710 | read_lock_bh(&instances_lock); | |
711 | ||
712 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
713 | struct hlist_node *tmp; | |
714 | struct nfqnl_instance *inst; | |
715 | struct hlist_head *head = &instance_table[i]; | |
716 | ||
717 | hlist_for_each_entry(inst, tmp, head, hlist) { | |
718 | struct nfqnl_queue_entry *entry; | |
601e68e1 | 719 | while ((entry = find_dequeue_entry(inst, dev_cmp, |
7af4cc3f HW |
720 | ifindex)) != NULL) |
721 | issue_verdict(entry, NF_DROP); | |
722 | } | |
723 | } | |
724 | ||
725 | read_unlock_bh(&instances_lock); | |
726 | } | |
727 | ||
728 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
729 | ||
730 | static int | |
731 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
732 | unsigned long event, void *ptr) | |
733 | { | |
734 | struct net_device *dev = ptr; | |
735 | ||
e9dc8653 EB |
736 | if (dev->nd_net != &init_net) |
737 | return NOTIFY_DONE; | |
738 | ||
7af4cc3f HW |
739 | /* Drop any packets associated with the downed device */ |
740 | if (event == NETDEV_DOWN) | |
741 | nfqnl_dev_drop(dev->ifindex); | |
742 | return NOTIFY_DONE; | |
743 | } | |
744 | ||
745 | static struct notifier_block nfqnl_dev_notifier = { | |
746 | .notifier_call = nfqnl_rcv_dev_event, | |
747 | }; | |
748 | ||
749 | static int | |
750 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
751 | unsigned long event, void *ptr) | |
752 | { | |
753 | struct netlink_notify *n = ptr; | |
754 | ||
755 | if (event == NETLINK_URELEASE && | |
756 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
757 | int i; | |
758 | ||
759 | /* destroy all instances for this pid */ | |
760 | write_lock_bh(&instances_lock); | |
761 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
762 | struct hlist_node *tmp, *t2; | |
763 | struct nfqnl_instance *inst; | |
764 | struct hlist_head *head = &instance_table[i]; | |
765 | ||
766 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
767 | if ((n->net == &init_net) && |
768 | (n->pid == inst->peer_pid)) | |
7af4cc3f HW |
769 | __instance_destroy(inst); |
770 | } | |
771 | } | |
772 | write_unlock_bh(&instances_lock); | |
773 | } | |
774 | return NOTIFY_DONE; | |
775 | } | |
776 | ||
777 | static struct notifier_block nfqnl_rtnl_notifier = { | |
778 | .notifier_call = nfqnl_rcv_nl_event, | |
779 | }; | |
780 | ||
838ab636 HW |
781 | static const int nfqa_verdict_min[NFQA_MAX] = { |
782 | [NFQA_VERDICT_HDR-1] = sizeof(struct nfqnl_msg_verdict_hdr), | |
783 | [NFQA_MARK-1] = sizeof(u_int32_t), | |
784 | [NFQA_PAYLOAD-1] = 0, | |
785 | }; | |
786 | ||
7af4cc3f HW |
787 | static int |
788 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
1d00a4eb | 789 | struct nlmsghdr *nlh, struct nfattr *nfqa[]) |
7af4cc3f HW |
790 | { |
791 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
792 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
793 | ||
794 | struct nfqnl_msg_verdict_hdr *vhdr; | |
795 | struct nfqnl_instance *queue; | |
796 | unsigned int verdict; | |
797 | struct nfqnl_queue_entry *entry; | |
838ab636 | 798 | int err; |
7af4cc3f | 799 | |
838ab636 HW |
800 | if (nfattr_bad_size(nfqa, NFQA_MAX, nfqa_verdict_min)) { |
801 | QDEBUG("bad attribute size\n"); | |
802 | return -EINVAL; | |
803 | } | |
804 | ||
805 | queue = instance_lookup_get(queue_num); | |
7af4cc3f HW |
806 | if (!queue) |
807 | return -ENODEV; | |
808 | ||
838ab636 HW |
809 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
810 | err = -EPERM; | |
811 | goto err_out_put; | |
812 | } | |
7af4cc3f | 813 | |
838ab636 HW |
814 | if (!nfqa[NFQA_VERDICT_HDR-1]) { |
815 | err = -EINVAL; | |
816 | goto err_out_put; | |
817 | } | |
7af4cc3f HW |
818 | |
819 | vhdr = NFA_DATA(nfqa[NFQA_VERDICT_HDR-1]); | |
820 | verdict = ntohl(vhdr->verdict); | |
821 | ||
838ab636 HW |
822 | if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) { |
823 | err = -EINVAL; | |
824 | goto err_out_put; | |
825 | } | |
7af4cc3f HW |
826 | |
827 | entry = find_dequeue_entry(queue, id_cmp, ntohl(vhdr->id)); | |
838ab636 HW |
828 | if (entry == NULL) { |
829 | err = -ENOENT; | |
830 | goto err_out_put; | |
831 | } | |
7af4cc3f HW |
832 | |
833 | if (nfqa[NFQA_PAYLOAD-1]) { | |
834 | if (nfqnl_mangle(NFA_DATA(nfqa[NFQA_PAYLOAD-1]), | |
835 | NFA_PAYLOAD(nfqa[NFQA_PAYLOAD-1]), entry) < 0) | |
836 | verdict = NF_DROP; | |
837 | } | |
838 | ||
839 | if (nfqa[NFQA_MARK-1]) | |
82e91ffe | 840 | entry->skb->mark = ntohl(*(__be32 *) |
601e68e1 YH |
841 | NFA_DATA(nfqa[NFQA_MARK-1])); |
842 | ||
7af4cc3f | 843 | issue_verdict(entry, verdict); |
838ab636 | 844 | instance_put(queue); |
7af4cc3f | 845 | return 0; |
838ab636 HW |
846 | |
847 | err_out_put: | |
848 | instance_put(queue); | |
849 | return err; | |
7af4cc3f HW |
850 | } |
851 | ||
852 | static int | |
853 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
1d00a4eb | 854 | struct nlmsghdr *nlh, struct nfattr *nfqa[]) |
7af4cc3f HW |
855 | { |
856 | return -ENOTSUPP; | |
857 | } | |
858 | ||
838ab636 HW |
859 | static const int nfqa_cfg_min[NFQA_CFG_MAX] = { |
860 | [NFQA_CFG_CMD-1] = sizeof(struct nfqnl_msg_config_cmd), | |
861 | [NFQA_CFG_PARAMS-1] = sizeof(struct nfqnl_msg_config_params), | |
862 | }; | |
863 | ||
bbd86b9f HW |
864 | static struct nf_queue_handler nfqh = { |
865 | .name = "nf_queue", | |
866 | .outfn = &nfqnl_enqueue_packet, | |
867 | }; | |
868 | ||
7af4cc3f HW |
869 | static int |
870 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
1d00a4eb | 871 | struct nlmsghdr *nlh, struct nfattr *nfqa[]) |
7af4cc3f HW |
872 | { |
873 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
874 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
875 | struct nfqnl_instance *queue; | |
838ab636 | 876 | int ret = 0; |
7af4cc3f HW |
877 | |
878 | QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); | |
879 | ||
838ab636 HW |
880 | if (nfattr_bad_size(nfqa, NFQA_CFG_MAX, nfqa_cfg_min)) { |
881 | QDEBUG("bad attribute size\n"); | |
882 | return -EINVAL; | |
883 | } | |
884 | ||
885 | queue = instance_lookup_get(queue_num); | |
7af4cc3f HW |
886 | if (nfqa[NFQA_CFG_CMD-1]) { |
887 | struct nfqnl_msg_config_cmd *cmd; | |
888 | cmd = NFA_DATA(nfqa[NFQA_CFG_CMD-1]); | |
889 | QDEBUG("found CFG_CMD\n"); | |
890 | ||
891 | switch (cmd->command) { | |
892 | case NFQNL_CFG_CMD_BIND: | |
893 | if (queue) | |
894 | return -EBUSY; | |
895 | ||
896 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); | |
897 | if (!queue) | |
898 | return -EINVAL; | |
899 | break; | |
900 | case NFQNL_CFG_CMD_UNBIND: | |
901 | if (!queue) | |
902 | return -ENODEV; | |
903 | ||
838ab636 HW |
904 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
905 | ret = -EPERM; | |
906 | goto out_put; | |
907 | } | |
7af4cc3f HW |
908 | |
909 | instance_destroy(queue); | |
910 | break; | |
911 | case NFQNL_CFG_CMD_PF_BIND: | |
912 | QDEBUG("registering queue handler for pf=%u\n", | |
913 | ntohs(cmd->pf)); | |
bbd86b9f | 914 | ret = nf_register_queue_handler(ntohs(cmd->pf), &nfqh); |
7af4cc3f HW |
915 | break; |
916 | case NFQNL_CFG_CMD_PF_UNBIND: | |
917 | QDEBUG("unregistering queue handler for pf=%u\n", | |
918 | ntohs(cmd->pf)); | |
ce7663d8 | 919 | ret = nf_unregister_queue_handler(ntohs(cmd->pf), &nfqh); |
7af4cc3f HW |
920 | break; |
921 | default: | |
838ab636 HW |
922 | ret = -EINVAL; |
923 | break; | |
7af4cc3f HW |
924 | } |
925 | } else { | |
926 | if (!queue) { | |
927 | QDEBUG("no config command, and no instance ENOENT\n"); | |
838ab636 HW |
928 | ret = -ENOENT; |
929 | goto out_put; | |
7af4cc3f HW |
930 | } |
931 | ||
932 | if (queue->peer_pid != NETLINK_CB(skb).pid) { | |
933 | QDEBUG("no config command, and wrong pid\n"); | |
838ab636 HW |
934 | ret = -EPERM; |
935 | goto out_put; | |
7af4cc3f HW |
936 | } |
937 | } | |
938 | ||
939 | if (nfqa[NFQA_CFG_PARAMS-1]) { | |
940 | struct nfqnl_msg_config_params *params; | |
7af4cc3f | 941 | |
406dbfc9 PM |
942 | if (!queue) { |
943 | ret = -ENOENT; | |
944 | goto out_put; | |
945 | } | |
946 | params = NFA_DATA(nfqa[NFQA_CFG_PARAMS-1]); | |
7af4cc3f HW |
947 | nfqnl_set_mode(queue, params->copy_mode, |
948 | ntohl(params->copy_range)); | |
949 | } | |
950 | ||
829e17a1 EL |
951 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN-1]) { |
952 | __be32 *queue_maxlen; | |
953 | queue_maxlen = NFA_DATA(nfqa[NFQA_CFG_QUEUE_MAXLEN-1]); | |
954 | spin_lock_bh(&queue->lock); | |
955 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
956 | spin_unlock_bh(&queue->lock); | |
957 | } | |
958 | ||
838ab636 HW |
959 | out_put: |
960 | instance_put(queue); | |
961 | return ret; | |
7af4cc3f HW |
962 | } |
963 | ||
7c8d4cb4 | 964 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
7af4cc3f | 965 | [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp, |
37d2e7a2 | 966 | .attr_count = NFQA_MAX, }, |
7af4cc3f | 967 | [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict, |
37d2e7a2 | 968 | .attr_count = NFQA_MAX, }, |
7af4cc3f | 969 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
37d2e7a2 | 970 | .attr_count = NFQA_CFG_MAX, }, |
7af4cc3f HW |
971 | }; |
972 | ||
7c8d4cb4 | 973 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
974 | .name = "nf_queue", |
975 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
976 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
977 | .cb = nfqnl_cb, |
978 | }; | |
979 | ||
838ab636 HW |
980 | #ifdef CONFIG_PROC_FS |
981 | struct iter_state { | |
982 | unsigned int bucket; | |
983 | }; | |
984 | ||
985 | static struct hlist_node *get_first(struct seq_file *seq) | |
986 | { | |
987 | struct iter_state *st = seq->private; | |
988 | ||
989 | if (!st) | |
990 | return NULL; | |
991 | ||
992 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
993 | if (!hlist_empty(&instance_table[st->bucket])) | |
994 | return instance_table[st->bucket].first; | |
995 | } | |
996 | return NULL; | |
997 | } | |
998 | ||
999 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1000 | { | |
1001 | struct iter_state *st = seq->private; | |
1002 | ||
1003 | h = h->next; | |
1004 | while (!h) { | |
1005 | if (++st->bucket >= INSTANCE_BUCKETS) | |
1006 | return NULL; | |
1007 | ||
1008 | h = instance_table[st->bucket].first; | |
1009 | } | |
1010 | return h; | |
1011 | } | |
1012 | ||
1013 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1014 | { | |
1015 | struct hlist_node *head; | |
1016 | head = get_first(seq); | |
1017 | ||
1018 | if (head) | |
1019 | while (pos && (head = get_next(seq, head))) | |
1020 | pos--; | |
1021 | return pos ? NULL : head; | |
1022 | } | |
1023 | ||
1024 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
1025 | { | |
1026 | read_lock_bh(&instances_lock); | |
1027 | return get_idx(seq, *pos); | |
1028 | } | |
1029 | ||
1030 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1031 | { | |
1032 | (*pos)++; | |
1033 | return get_next(s, v); | |
1034 | } | |
1035 | ||
1036 | static void seq_stop(struct seq_file *s, void *v) | |
1037 | { | |
1038 | read_unlock_bh(&instances_lock); | |
1039 | } | |
1040 | ||
1041 | static int seq_show(struct seq_file *s, void *v) | |
1042 | { | |
1043 | const struct nfqnl_instance *inst = v; | |
1044 | ||
1045 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1046 | inst->queue_num, | |
1047 | inst->peer_pid, inst->queue_total, | |
1048 | inst->copy_mode, inst->copy_range, | |
1049 | inst->queue_dropped, inst->queue_user_dropped, | |
1050 | atomic_read(&inst->id_sequence), | |
1051 | atomic_read(&inst->use)); | |
1052 | } | |
1053 | ||
56b3d975 | 1054 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1055 | .start = seq_start, |
1056 | .next = seq_next, | |
1057 | .stop = seq_stop, | |
1058 | .show = seq_show, | |
1059 | }; | |
1060 | ||
1061 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1062 | { | |
1063 | struct seq_file *seq; | |
1064 | struct iter_state *is; | |
1065 | int ret; | |
1066 | ||
10dfdc69 | 1067 | is = kzalloc(sizeof(*is), GFP_KERNEL); |
838ab636 HW |
1068 | if (!is) |
1069 | return -ENOMEM; | |
838ab636 HW |
1070 | ret = seq_open(file, &nfqnl_seq_ops); |
1071 | if (ret < 0) | |
1072 | goto out_free; | |
1073 | seq = file->private_data; | |
1074 | seq->private = is; | |
1075 | return ret; | |
1076 | out_free: | |
1077 | kfree(is); | |
1078 | return ret; | |
1079 | } | |
1080 | ||
da7071d7 | 1081 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1082 | .owner = THIS_MODULE, |
1083 | .open = nfqnl_open, | |
1084 | .read = seq_read, | |
1085 | .llseek = seq_lseek, | |
1086 | .release = seq_release_private, | |
1087 | }; | |
1088 | ||
1089 | #endif /* PROC_FS */ | |
1090 | ||
32292a7f | 1091 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 1092 | { |
838ab636 HW |
1093 | int i, status = -ENOMEM; |
1094 | #ifdef CONFIG_PROC_FS | |
1095 | struct proc_dir_entry *proc_nfqueue; | |
1096 | #endif | |
601e68e1 | 1097 | |
838ab636 HW |
1098 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1099 | INIT_HLIST_HEAD(&instance_table[i]); | |
1100 | ||
7af4cc3f HW |
1101 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1102 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1103 | if (status < 0) { | |
1104 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
1105 | goto cleanup_netlink_notifier; | |
1106 | } | |
1107 | ||
838ab636 HW |
1108 | #ifdef CONFIG_PROC_FS |
1109 | proc_nfqueue = create_proc_entry("nfnetlink_queue", 0440, | |
1110 | proc_net_netfilter); | |
1111 | if (!proc_nfqueue) | |
1112 | goto cleanup_subsys; | |
1113 | proc_nfqueue->proc_fops = &nfqnl_file_ops; | |
1114 | #endif | |
1115 | ||
7af4cc3f HW |
1116 | register_netdevice_notifier(&nfqnl_dev_notifier); |
1117 | return status; | |
1118 | ||
838ab636 HW |
1119 | #ifdef CONFIG_PROC_FS |
1120 | cleanup_subsys: | |
7af4cc3f | 1121 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 1122 | #endif |
7af4cc3f HW |
1123 | cleanup_netlink_notifier: |
1124 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1125 | return status; | |
1126 | } | |
1127 | ||
65b4b4e8 | 1128 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1129 | { |
32292a7f PM |
1130 | nf_unregister_queue_handlers(&nfqh); |
1131 | unregister_netdevice_notifier(&nfqnl_dev_notifier); | |
1132 | #ifdef CONFIG_PROC_FS | |
1133 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
1134 | #endif | |
1135 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
1136 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
7af4cc3f HW |
1137 | } |
1138 | ||
1139 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1140 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1141 | MODULE_LICENSE("GPL"); | |
1142 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1143 | ||
65b4b4e8 AM |
1144 | module_init(nfnetlink_queue_init); |
1145 | module_exit(nfnetlink_queue_fini); |