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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 | ||
3e4ead4f JJ |
488 | if (indev && entskb->dev |
489 | && entskb->dev->hard_header_parse) { | |
7af4cc3f HW |
490 | struct nfqnl_msg_packet_hw phw; |
491 | ||
98a4a861 | 492 | int len = entskb->dev->hard_header_parse(entskb, |
601e68e1 | 493 | phw.hw_addr); |
98a4a861 | 494 | phw.hw_addrlen = htons(len); |
7af4cc3f HW |
495 | NFA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); |
496 | } | |
497 | ||
b7aa0bf7 | 498 | if (entskb->tstamp.tv64) { |
7af4cc3f | 499 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
500 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
501 | ts.sec = cpu_to_be64(tv.tv_sec); | |
502 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f HW |
503 | |
504 | NFA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts); | |
505 | } | |
506 | ||
507 | if (data_len) { | |
508 | struct nfattr *nfa; | |
509 | int size = NFA_LENGTH(data_len); | |
510 | ||
511 | if (skb_tailroom(skb) < (int)NFA_SPACE(data_len)) { | |
512 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); | |
513 | goto nlmsg_failure; | |
514 | } | |
515 | ||
516 | nfa = (struct nfattr *)skb_put(skb, NFA_ALIGN(size)); | |
517 | nfa->nfa_type = NFQA_PAYLOAD; | |
518 | nfa->nfa_len = size; | |
519 | ||
3e4ead4f | 520 | if (skb_copy_bits(entskb, 0, NFA_DATA(nfa), data_len)) |
7af4cc3f HW |
521 | BUG(); |
522 | } | |
601e68e1 | 523 | |
7af4cc3f HW |
524 | nlh->nlmsg_len = skb->tail - old_tail; |
525 | return skb; | |
526 | ||
527 | nlmsg_failure: | |
528 | nfattr_failure: | |
529 | if (skb) | |
530 | kfree_skb(skb); | |
531 | *errp = -EINVAL; | |
532 | if (net_ratelimit()) | |
533 | printk(KERN_ERR "nf_queue: error creating packet message\n"); | |
534 | return NULL; | |
535 | } | |
536 | ||
537 | static int | |
601e68e1 | 538 | nfqnl_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
7af4cc3f HW |
539 | unsigned int queuenum, void *data) |
540 | { | |
541 | int status = -EINVAL; | |
542 | struct sk_buff *nskb; | |
543 | struct nfqnl_instance *queue; | |
544 | struct nfqnl_queue_entry *entry; | |
545 | ||
546 | QDEBUG("entered\n"); | |
547 | ||
838ab636 | 548 | queue = instance_lookup_get(queuenum); |
7af4cc3f HW |
549 | if (!queue) { |
550 | QDEBUG("no queue instance matching\n"); | |
551 | return -EINVAL; | |
552 | } | |
553 | ||
554 | if (queue->copy_mode == NFQNL_COPY_NONE) { | |
555 | QDEBUG("mode COPY_NONE, aborting\n"); | |
838ab636 HW |
556 | status = -EAGAIN; |
557 | goto err_out_put; | |
7af4cc3f HW |
558 | } |
559 | ||
560 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
561 | if (entry == NULL) { | |
562 | if (net_ratelimit()) | |
601e68e1 | 563 | printk(KERN_ERR |
7af4cc3f | 564 | "nf_queue: OOM in nfqnl_enqueue_packet()\n"); |
838ab636 HW |
565 | status = -ENOMEM; |
566 | goto err_out_put; | |
7af4cc3f HW |
567 | } |
568 | ||
569 | entry->info = info; | |
570 | entry->skb = skb; | |
571 | entry->id = atomic_inc_return(&queue->id_sequence); | |
572 | ||
573 | nskb = nfqnl_build_packet_message(queue, entry, &status); | |
574 | if (nskb == NULL) | |
575 | goto err_out_free; | |
601e68e1 | 576 | |
7af4cc3f | 577 | spin_lock_bh(&queue->lock); |
601e68e1 | 578 | |
7af4cc3f | 579 | if (!queue->peer_pid) |
601e68e1 | 580 | goto err_out_free_nskb; |
7af4cc3f HW |
581 | |
582 | if (queue->queue_total >= queue->queue_maxlen) { | |
601e68e1 | 583 | queue->queue_dropped++; |
7af4cc3f HW |
584 | status = -ENOSPC; |
585 | if (net_ratelimit()) | |
601e68e1 YH |
586 | printk(KERN_WARNING "nf_queue: full at %d entries, " |
587 | "dropping packets(s). Dropped: %d\n", | |
7af4cc3f HW |
588 | queue->queue_total, queue->queue_dropped); |
589 | goto err_out_free_nskb; | |
590 | } | |
591 | ||
592 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
593 | status = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT); | |
594 | if (status < 0) { | |
601e68e1 | 595 | queue->queue_user_dropped++; |
7af4cc3f HW |
596 | goto err_out_unlock; |
597 | } | |
598 | ||
599 | __enqueue_entry(queue, entry); | |
600 | ||
601 | spin_unlock_bh(&queue->lock); | |
838ab636 | 602 | instance_put(queue); |
7af4cc3f HW |
603 | return status; |
604 | ||
605 | err_out_free_nskb: | |
601e68e1 YH |
606 | kfree_skb(nskb); |
607 | ||
7af4cc3f HW |
608 | err_out_unlock: |
609 | spin_unlock_bh(&queue->lock); | |
610 | ||
611 | err_out_free: | |
612 | kfree(entry); | |
838ab636 HW |
613 | err_out_put: |
614 | instance_put(queue); | |
7af4cc3f HW |
615 | return status; |
616 | } | |
617 | ||
618 | static int | |
619 | nfqnl_mangle(void *data, int data_len, struct nfqnl_queue_entry *e) | |
620 | { | |
621 | int diff; | |
622 | ||
623 | diff = data_len - e->skb->len; | |
d8a585d7 PM |
624 | if (diff < 0) { |
625 | if (pskb_trim(e->skb, data_len)) | |
626 | return -ENOMEM; | |
627 | } else if (diff > 0) { | |
7af4cc3f HW |
628 | if (data_len > 0xFFFF) |
629 | return -EINVAL; | |
630 | if (diff > skb_tailroom(e->skb)) { | |
631 | struct sk_buff *newskb; | |
601e68e1 | 632 | |
7af4cc3f | 633 | newskb = skb_copy_expand(e->skb, |
601e68e1 YH |
634 | skb_headroom(e->skb), |
635 | diff, | |
636 | GFP_ATOMIC); | |
7af4cc3f | 637 | if (newskb == NULL) { |
1158ba27 | 638 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f HW |
639 | "in mangle, dropping packet\n"); |
640 | return -ENOMEM; | |
641 | } | |
642 | if (e->skb->sk) | |
643 | skb_set_owner_w(newskb, e->skb->sk); | |
644 | kfree_skb(e->skb); | |
645 | e->skb = newskb; | |
646 | } | |
647 | skb_put(e->skb, diff); | |
648 | } | |
649 | if (!skb_make_writable(&e->skb, data_len)) | |
650 | return -ENOMEM; | |
651 | memcpy(e->skb->data, data, data_len); | |
e7dfb09a | 652 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
653 | return 0; |
654 | } | |
655 | ||
656 | static inline int | |
657 | id_cmp(struct nfqnl_queue_entry *e, unsigned long id) | |
658 | { | |
659 | return (id == e->id); | |
660 | } | |
661 | ||
662 | static int | |
663 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
664 | unsigned char mode, unsigned int range) | |
665 | { | |
666 | int status; | |
667 | ||
668 | spin_lock_bh(&queue->lock); | |
669 | status = __nfqnl_set_mode(queue, mode, range); | |
670 | spin_unlock_bh(&queue->lock); | |
671 | ||
672 | return status; | |
673 | } | |
674 | ||
675 | static int | |
676 | dev_cmp(struct nfqnl_queue_entry *entry, unsigned long ifindex) | |
677 | { | |
3e4ead4f | 678 | struct nf_info *entinf = entry->info; |
601e68e1 | 679 | |
3e4ead4f JJ |
680 | if (entinf->indev) |
681 | if (entinf->indev->ifindex == ifindex) | |
7af4cc3f | 682 | return 1; |
3e4ead4f JJ |
683 | if (entinf->outdev) |
684 | if (entinf->outdev->ifindex == ifindex) | |
7af4cc3f | 685 | return 1; |
ef47c6a7 PM |
686 | #ifdef CONFIG_BRIDGE_NETFILTER |
687 | if (entry->skb->nf_bridge) { | |
688 | if (entry->skb->nf_bridge->physindev && | |
689 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
690 | return 1; | |
691 | if (entry->skb->nf_bridge->physoutdev && | |
692 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
693 | return 1; | |
694 | } | |
695 | #endif | |
7af4cc3f HW |
696 | return 0; |
697 | } | |
698 | ||
699 | /* drop all packets with either indev or outdev == ifindex from all queue | |
700 | * instances */ | |
701 | static void | |
702 | nfqnl_dev_drop(int ifindex) | |
703 | { | |
704 | int i; | |
601e68e1 | 705 | |
7af4cc3f HW |
706 | QDEBUG("entering for ifindex %u\n", ifindex); |
707 | ||
708 | /* this only looks like we have to hold the readlock for a way too long | |
709 | * time, issue_verdict(), nf_reinject(), ... - but we always only | |
710 | * issue NF_DROP, which is processed directly in nf_reinject() */ | |
711 | read_lock_bh(&instances_lock); | |
712 | ||
713 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
714 | struct hlist_node *tmp; | |
715 | struct nfqnl_instance *inst; | |
716 | struct hlist_head *head = &instance_table[i]; | |
717 | ||
718 | hlist_for_each_entry(inst, tmp, head, hlist) { | |
719 | struct nfqnl_queue_entry *entry; | |
601e68e1 | 720 | while ((entry = find_dequeue_entry(inst, dev_cmp, |
7af4cc3f HW |
721 | ifindex)) != NULL) |
722 | issue_verdict(entry, NF_DROP); | |
723 | } | |
724 | } | |
725 | ||
726 | read_unlock_bh(&instances_lock); | |
727 | } | |
728 | ||
729 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
730 | ||
731 | static int | |
732 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
733 | unsigned long event, void *ptr) | |
734 | { | |
735 | struct net_device *dev = ptr; | |
736 | ||
737 | /* Drop any packets associated with the downed device */ | |
738 | if (event == NETDEV_DOWN) | |
739 | nfqnl_dev_drop(dev->ifindex); | |
740 | return NOTIFY_DONE; | |
741 | } | |
742 | ||
743 | static struct notifier_block nfqnl_dev_notifier = { | |
744 | .notifier_call = nfqnl_rcv_dev_event, | |
745 | }; | |
746 | ||
747 | static int | |
748 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
749 | unsigned long event, void *ptr) | |
750 | { | |
751 | struct netlink_notify *n = ptr; | |
752 | ||
753 | if (event == NETLINK_URELEASE && | |
754 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
755 | int i; | |
756 | ||
757 | /* destroy all instances for this pid */ | |
758 | write_lock_bh(&instances_lock); | |
759 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
760 | struct hlist_node *tmp, *t2; | |
761 | struct nfqnl_instance *inst; | |
762 | struct hlist_head *head = &instance_table[i]; | |
763 | ||
764 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
765 | if (n->pid == inst->peer_pid) | |
766 | __instance_destroy(inst); | |
767 | } | |
768 | } | |
769 | write_unlock_bh(&instances_lock); | |
770 | } | |
771 | return NOTIFY_DONE; | |
772 | } | |
773 | ||
774 | static struct notifier_block nfqnl_rtnl_notifier = { | |
775 | .notifier_call = nfqnl_rcv_nl_event, | |
776 | }; | |
777 | ||
838ab636 HW |
778 | static const int nfqa_verdict_min[NFQA_MAX] = { |
779 | [NFQA_VERDICT_HDR-1] = sizeof(struct nfqnl_msg_verdict_hdr), | |
780 | [NFQA_MARK-1] = sizeof(u_int32_t), | |
781 | [NFQA_PAYLOAD-1] = 0, | |
782 | }; | |
783 | ||
7af4cc3f HW |
784 | static int |
785 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
1d00a4eb | 786 | struct nlmsghdr *nlh, struct nfattr *nfqa[]) |
7af4cc3f HW |
787 | { |
788 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
789 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
790 | ||
791 | struct nfqnl_msg_verdict_hdr *vhdr; | |
792 | struct nfqnl_instance *queue; | |
793 | unsigned int verdict; | |
794 | struct nfqnl_queue_entry *entry; | |
838ab636 | 795 | int err; |
7af4cc3f | 796 | |
838ab636 HW |
797 | if (nfattr_bad_size(nfqa, NFQA_MAX, nfqa_verdict_min)) { |
798 | QDEBUG("bad attribute size\n"); | |
799 | return -EINVAL; | |
800 | } | |
801 | ||
802 | queue = instance_lookup_get(queue_num); | |
7af4cc3f HW |
803 | if (!queue) |
804 | return -ENODEV; | |
805 | ||
838ab636 HW |
806 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
807 | err = -EPERM; | |
808 | goto err_out_put; | |
809 | } | |
7af4cc3f | 810 | |
838ab636 HW |
811 | if (!nfqa[NFQA_VERDICT_HDR-1]) { |
812 | err = -EINVAL; | |
813 | goto err_out_put; | |
814 | } | |
7af4cc3f HW |
815 | |
816 | vhdr = NFA_DATA(nfqa[NFQA_VERDICT_HDR-1]); | |
817 | verdict = ntohl(vhdr->verdict); | |
818 | ||
838ab636 HW |
819 | if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) { |
820 | err = -EINVAL; | |
821 | goto err_out_put; | |
822 | } | |
7af4cc3f HW |
823 | |
824 | entry = find_dequeue_entry(queue, id_cmp, ntohl(vhdr->id)); | |
838ab636 HW |
825 | if (entry == NULL) { |
826 | err = -ENOENT; | |
827 | goto err_out_put; | |
828 | } | |
7af4cc3f HW |
829 | |
830 | if (nfqa[NFQA_PAYLOAD-1]) { | |
831 | if (nfqnl_mangle(NFA_DATA(nfqa[NFQA_PAYLOAD-1]), | |
832 | NFA_PAYLOAD(nfqa[NFQA_PAYLOAD-1]), entry) < 0) | |
833 | verdict = NF_DROP; | |
834 | } | |
835 | ||
836 | if (nfqa[NFQA_MARK-1]) | |
82e91ffe | 837 | entry->skb->mark = ntohl(*(__be32 *) |
601e68e1 YH |
838 | NFA_DATA(nfqa[NFQA_MARK-1])); |
839 | ||
7af4cc3f | 840 | issue_verdict(entry, verdict); |
838ab636 | 841 | instance_put(queue); |
7af4cc3f | 842 | return 0; |
838ab636 HW |
843 | |
844 | err_out_put: | |
845 | instance_put(queue); | |
846 | return err; | |
7af4cc3f HW |
847 | } |
848 | ||
849 | static int | |
850 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
1d00a4eb | 851 | struct nlmsghdr *nlh, struct nfattr *nfqa[]) |
7af4cc3f HW |
852 | { |
853 | return -ENOTSUPP; | |
854 | } | |
855 | ||
838ab636 HW |
856 | static const int nfqa_cfg_min[NFQA_CFG_MAX] = { |
857 | [NFQA_CFG_CMD-1] = sizeof(struct nfqnl_msg_config_cmd), | |
858 | [NFQA_CFG_PARAMS-1] = sizeof(struct nfqnl_msg_config_params), | |
859 | }; | |
860 | ||
bbd86b9f HW |
861 | static struct nf_queue_handler nfqh = { |
862 | .name = "nf_queue", | |
863 | .outfn = &nfqnl_enqueue_packet, | |
864 | }; | |
865 | ||
7af4cc3f HW |
866 | static int |
867 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
1d00a4eb | 868 | struct nlmsghdr *nlh, struct nfattr *nfqa[]) |
7af4cc3f HW |
869 | { |
870 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
871 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
872 | struct nfqnl_instance *queue; | |
838ab636 | 873 | int ret = 0; |
7af4cc3f HW |
874 | |
875 | QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); | |
876 | ||
838ab636 HW |
877 | if (nfattr_bad_size(nfqa, NFQA_CFG_MAX, nfqa_cfg_min)) { |
878 | QDEBUG("bad attribute size\n"); | |
879 | return -EINVAL; | |
880 | } | |
881 | ||
882 | queue = instance_lookup_get(queue_num); | |
7af4cc3f HW |
883 | if (nfqa[NFQA_CFG_CMD-1]) { |
884 | struct nfqnl_msg_config_cmd *cmd; | |
885 | cmd = NFA_DATA(nfqa[NFQA_CFG_CMD-1]); | |
886 | QDEBUG("found CFG_CMD\n"); | |
887 | ||
888 | switch (cmd->command) { | |
889 | case NFQNL_CFG_CMD_BIND: | |
890 | if (queue) | |
891 | return -EBUSY; | |
892 | ||
893 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); | |
894 | if (!queue) | |
895 | return -EINVAL; | |
896 | break; | |
897 | case NFQNL_CFG_CMD_UNBIND: | |
898 | if (!queue) | |
899 | return -ENODEV; | |
900 | ||
838ab636 HW |
901 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
902 | ret = -EPERM; | |
903 | goto out_put; | |
904 | } | |
7af4cc3f HW |
905 | |
906 | instance_destroy(queue); | |
907 | break; | |
908 | case NFQNL_CFG_CMD_PF_BIND: | |
909 | QDEBUG("registering queue handler for pf=%u\n", | |
910 | ntohs(cmd->pf)); | |
bbd86b9f | 911 | ret = nf_register_queue_handler(ntohs(cmd->pf), &nfqh); |
7af4cc3f HW |
912 | break; |
913 | case NFQNL_CFG_CMD_PF_UNBIND: | |
914 | QDEBUG("unregistering queue handler for pf=%u\n", | |
915 | ntohs(cmd->pf)); | |
916 | /* This is a bug and a feature. We can unregister | |
917 | * other handlers(!) */ | |
838ab636 | 918 | ret = nf_unregister_queue_handler(ntohs(cmd->pf)); |
7af4cc3f HW |
919 | break; |
920 | default: | |
838ab636 HW |
921 | ret = -EINVAL; |
922 | break; | |
7af4cc3f HW |
923 | } |
924 | } else { | |
925 | if (!queue) { | |
926 | QDEBUG("no config command, and no instance ENOENT\n"); | |
838ab636 HW |
927 | ret = -ENOENT; |
928 | goto out_put; | |
7af4cc3f HW |
929 | } |
930 | ||
931 | if (queue->peer_pid != NETLINK_CB(skb).pid) { | |
932 | QDEBUG("no config command, and wrong pid\n"); | |
838ab636 HW |
933 | ret = -EPERM; |
934 | goto out_put; | |
7af4cc3f HW |
935 | } |
936 | } | |
937 | ||
938 | if (nfqa[NFQA_CFG_PARAMS-1]) { | |
939 | struct nfqnl_msg_config_params *params; | |
7af4cc3f | 940 | |
406dbfc9 PM |
941 | if (!queue) { |
942 | ret = -ENOENT; | |
943 | goto out_put; | |
944 | } | |
945 | params = NFA_DATA(nfqa[NFQA_CFG_PARAMS-1]); | |
7af4cc3f HW |
946 | nfqnl_set_mode(queue, params->copy_mode, |
947 | ntohl(params->copy_range)); | |
948 | } | |
949 | ||
829e17a1 EL |
950 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN-1]) { |
951 | __be32 *queue_maxlen; | |
952 | queue_maxlen = NFA_DATA(nfqa[NFQA_CFG_QUEUE_MAXLEN-1]); | |
953 | spin_lock_bh(&queue->lock); | |
954 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
955 | spin_unlock_bh(&queue->lock); | |
956 | } | |
957 | ||
838ab636 HW |
958 | out_put: |
959 | instance_put(queue); | |
960 | return ret; | |
7af4cc3f HW |
961 | } |
962 | ||
963 | static struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { | |
964 | [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp, | |
37d2e7a2 | 965 | .attr_count = NFQA_MAX, }, |
7af4cc3f | 966 | [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict, |
37d2e7a2 | 967 | .attr_count = NFQA_MAX, }, |
7af4cc3f | 968 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
37d2e7a2 | 969 | .attr_count = NFQA_CFG_MAX, }, |
7af4cc3f HW |
970 | }; |
971 | ||
972 | static struct nfnetlink_subsystem nfqnl_subsys = { | |
973 | .name = "nf_queue", | |
974 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
975 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
976 | .cb = nfqnl_cb, |
977 | }; | |
978 | ||
838ab636 HW |
979 | #ifdef CONFIG_PROC_FS |
980 | struct iter_state { | |
981 | unsigned int bucket; | |
982 | }; | |
983 | ||
984 | static struct hlist_node *get_first(struct seq_file *seq) | |
985 | { | |
986 | struct iter_state *st = seq->private; | |
987 | ||
988 | if (!st) | |
989 | return NULL; | |
990 | ||
991 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
992 | if (!hlist_empty(&instance_table[st->bucket])) | |
993 | return instance_table[st->bucket].first; | |
994 | } | |
995 | return NULL; | |
996 | } | |
997 | ||
998 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
999 | { | |
1000 | struct iter_state *st = seq->private; | |
1001 | ||
1002 | h = h->next; | |
1003 | while (!h) { | |
1004 | if (++st->bucket >= INSTANCE_BUCKETS) | |
1005 | return NULL; | |
1006 | ||
1007 | h = instance_table[st->bucket].first; | |
1008 | } | |
1009 | return h; | |
1010 | } | |
1011 | ||
1012 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1013 | { | |
1014 | struct hlist_node *head; | |
1015 | head = get_first(seq); | |
1016 | ||
1017 | if (head) | |
1018 | while (pos && (head = get_next(seq, head))) | |
1019 | pos--; | |
1020 | return pos ? NULL : head; | |
1021 | } | |
1022 | ||
1023 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
1024 | { | |
1025 | read_lock_bh(&instances_lock); | |
1026 | return get_idx(seq, *pos); | |
1027 | } | |
1028 | ||
1029 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1030 | { | |
1031 | (*pos)++; | |
1032 | return get_next(s, v); | |
1033 | } | |
1034 | ||
1035 | static void seq_stop(struct seq_file *s, void *v) | |
1036 | { | |
1037 | read_unlock_bh(&instances_lock); | |
1038 | } | |
1039 | ||
1040 | static int seq_show(struct seq_file *s, void *v) | |
1041 | { | |
1042 | const struct nfqnl_instance *inst = v; | |
1043 | ||
1044 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1045 | inst->queue_num, | |
1046 | inst->peer_pid, inst->queue_total, | |
1047 | inst->copy_mode, inst->copy_range, | |
1048 | inst->queue_dropped, inst->queue_user_dropped, | |
1049 | atomic_read(&inst->id_sequence), | |
1050 | atomic_read(&inst->use)); | |
1051 | } | |
1052 | ||
1053 | static struct seq_operations nfqnl_seq_ops = { | |
1054 | .start = seq_start, | |
1055 | .next = seq_next, | |
1056 | .stop = seq_stop, | |
1057 | .show = seq_show, | |
1058 | }; | |
1059 | ||
1060 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1061 | { | |
1062 | struct seq_file *seq; | |
1063 | struct iter_state *is; | |
1064 | int ret; | |
1065 | ||
10dfdc69 | 1066 | is = kzalloc(sizeof(*is), GFP_KERNEL); |
838ab636 HW |
1067 | if (!is) |
1068 | return -ENOMEM; | |
838ab636 HW |
1069 | ret = seq_open(file, &nfqnl_seq_ops); |
1070 | if (ret < 0) | |
1071 | goto out_free; | |
1072 | seq = file->private_data; | |
1073 | seq->private = is; | |
1074 | return ret; | |
1075 | out_free: | |
1076 | kfree(is); | |
1077 | return ret; | |
1078 | } | |
1079 | ||
da7071d7 | 1080 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1081 | .owner = THIS_MODULE, |
1082 | .open = nfqnl_open, | |
1083 | .read = seq_read, | |
1084 | .llseek = seq_lseek, | |
1085 | .release = seq_release_private, | |
1086 | }; | |
1087 | ||
1088 | #endif /* PROC_FS */ | |
1089 | ||
32292a7f | 1090 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 1091 | { |
838ab636 HW |
1092 | int i, status = -ENOMEM; |
1093 | #ifdef CONFIG_PROC_FS | |
1094 | struct proc_dir_entry *proc_nfqueue; | |
1095 | #endif | |
601e68e1 | 1096 | |
838ab636 HW |
1097 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1098 | INIT_HLIST_HEAD(&instance_table[i]); | |
1099 | ||
7af4cc3f HW |
1100 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1101 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1102 | if (status < 0) { | |
1103 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
1104 | goto cleanup_netlink_notifier; | |
1105 | } | |
1106 | ||
838ab636 HW |
1107 | #ifdef CONFIG_PROC_FS |
1108 | proc_nfqueue = create_proc_entry("nfnetlink_queue", 0440, | |
1109 | proc_net_netfilter); | |
1110 | if (!proc_nfqueue) | |
1111 | goto cleanup_subsys; | |
1112 | proc_nfqueue->proc_fops = &nfqnl_file_ops; | |
1113 | #endif | |
1114 | ||
7af4cc3f HW |
1115 | register_netdevice_notifier(&nfqnl_dev_notifier); |
1116 | return status; | |
1117 | ||
838ab636 HW |
1118 | #ifdef CONFIG_PROC_FS |
1119 | cleanup_subsys: | |
7af4cc3f | 1120 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 1121 | #endif |
7af4cc3f HW |
1122 | cleanup_netlink_notifier: |
1123 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1124 | return status; | |
1125 | } | |
1126 | ||
65b4b4e8 | 1127 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1128 | { |
32292a7f PM |
1129 | nf_unregister_queue_handlers(&nfqh); |
1130 | unregister_netdevice_notifier(&nfqnl_dev_notifier); | |
1131 | #ifdef CONFIG_PROC_FS | |
1132 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
1133 | #endif | |
1134 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
1135 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
7af4cc3f HW |
1136 | } |
1137 | ||
1138 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1139 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1140 | MODULE_LICENSE("GPL"); | |
1141 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1142 | ||
65b4b4e8 AM |
1143 | module_init(nfnetlink_queue_init); |
1144 | module_exit(nfnetlink_queue_fini); |