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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> | |
c01cd429 | 30 | #include <net/netfilter/nf_queue.h> |
7af4cc3f HW |
31 | |
32 | #include <asm/atomic.h> | |
33 | ||
fbcd923c HW |
34 | #ifdef CONFIG_BRIDGE_NETFILTER |
35 | #include "../bridge/br_private.h" | |
36 | #endif | |
37 | ||
7af4cc3f HW |
38 | #define NFQNL_QMAX_DEFAULT 1024 |
39 | ||
40 | #if 0 | |
41 | #define QDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \ | |
42 | __FILE__, __LINE__, __FUNCTION__, \ | |
43 | ## args) | |
44 | #else | |
45 | #define QDEBUG(x, ...) | |
46 | #endif | |
47 | ||
48 | struct nfqnl_queue_entry { | |
49 | struct list_head list; | |
50 | struct nf_info *info; | |
51 | struct sk_buff *skb; | |
52 | unsigned int id; | |
53 | }; | |
54 | ||
55 | struct nfqnl_instance { | |
56 | struct hlist_node hlist; /* global list of queues */ | |
838ab636 | 57 | atomic_t use; |
7af4cc3f HW |
58 | |
59 | int peer_pid; | |
60 | unsigned int queue_maxlen; | |
61 | unsigned int copy_range; | |
62 | unsigned int queue_total; | |
63 | unsigned int queue_dropped; | |
64 | unsigned int queue_user_dropped; | |
65 | ||
66 | atomic_t id_sequence; /* 'sequence' of pkt ids */ | |
67 | ||
68 | u_int16_t queue_num; /* number of this queue */ | |
69 | u_int8_t copy_mode; | |
70 | ||
71 | spinlock_t lock; | |
72 | ||
73 | struct list_head queue_list; /* packets in queue */ | |
74 | }; | |
75 | ||
76 | typedef int (*nfqnl_cmpfn)(struct nfqnl_queue_entry *, unsigned long); | |
77 | ||
78 | static DEFINE_RWLOCK(instances_lock); | |
79 | ||
7af4cc3f HW |
80 | #define INSTANCE_BUCKETS 16 |
81 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
82 | ||
83 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
84 | { | |
85 | return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS; | |
86 | } | |
87 | ||
88 | static struct nfqnl_instance * | |
89 | __instance_lookup(u_int16_t queue_num) | |
90 | { | |
91 | struct hlist_head *head; | |
92 | struct hlist_node *pos; | |
93 | struct nfqnl_instance *inst; | |
94 | ||
95 | head = &instance_table[instance_hashfn(queue_num)]; | |
96 | hlist_for_each_entry(inst, pos, head, hlist) { | |
97 | if (inst->queue_num == queue_num) | |
98 | return inst; | |
99 | } | |
100 | return NULL; | |
101 | } | |
102 | ||
103 | static struct nfqnl_instance * | |
838ab636 | 104 | instance_lookup_get(u_int16_t queue_num) |
7af4cc3f HW |
105 | { |
106 | struct nfqnl_instance *inst; | |
107 | ||
108 | read_lock_bh(&instances_lock); | |
109 | inst = __instance_lookup(queue_num); | |
838ab636 HW |
110 | if (inst) |
111 | atomic_inc(&inst->use); | |
7af4cc3f HW |
112 | read_unlock_bh(&instances_lock); |
113 | ||
114 | return inst; | |
115 | } | |
116 | ||
838ab636 HW |
117 | static void |
118 | instance_put(struct nfqnl_instance *inst) | |
119 | { | |
120 | if (inst && atomic_dec_and_test(&inst->use)) { | |
121 | QDEBUG("kfree(inst=%p)\n", inst); | |
122 | kfree(inst); | |
123 | } | |
124 | } | |
125 | ||
7af4cc3f HW |
126 | static struct nfqnl_instance * |
127 | instance_create(u_int16_t queue_num, int pid) | |
128 | { | |
129 | struct nfqnl_instance *inst; | |
130 | ||
131 | QDEBUG("entering for queue_num=%u, pid=%d\n", queue_num, pid); | |
132 | ||
601e68e1 | 133 | write_lock_bh(&instances_lock); |
7af4cc3f HW |
134 | if (__instance_lookup(queue_num)) { |
135 | inst = NULL; | |
136 | QDEBUG("aborting, instance already exists\n"); | |
137 | goto out_unlock; | |
138 | } | |
139 | ||
10dfdc69 | 140 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
7af4cc3f HW |
141 | if (!inst) |
142 | goto out_unlock; | |
143 | ||
7af4cc3f HW |
144 | inst->queue_num = queue_num; |
145 | inst->peer_pid = pid; | |
146 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; | |
147 | inst->copy_range = 0xfffff; | |
148 | inst->copy_mode = NFQNL_COPY_NONE; | |
149 | atomic_set(&inst->id_sequence, 0); | |
838ab636 HW |
150 | /* needs to be two, since we _put() after creation */ |
151 | atomic_set(&inst->use, 2); | |
181a46a5 | 152 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
153 | INIT_LIST_HEAD(&inst->queue_list); |
154 | ||
155 | if (!try_module_get(THIS_MODULE)) | |
156 | goto out_free; | |
157 | ||
601e68e1 | 158 | hlist_add_head(&inst->hlist, |
7af4cc3f HW |
159 | &instance_table[instance_hashfn(queue_num)]); |
160 | ||
161 | write_unlock_bh(&instances_lock); | |
162 | ||
163 | QDEBUG("successfully created new instance\n"); | |
164 | ||
165 | return inst; | |
166 | ||
167 | out_free: | |
168 | kfree(inst); | |
169 | out_unlock: | |
170 | write_unlock_bh(&instances_lock); | |
171 | return NULL; | |
172 | } | |
173 | ||
174 | static void nfqnl_flush(struct nfqnl_instance *queue, int verdict); | |
175 | ||
176 | static void | |
177 | _instance_destroy2(struct nfqnl_instance *inst, int lock) | |
178 | { | |
179 | /* first pull it out of the global list */ | |
180 | if (lock) | |
181 | write_lock_bh(&instances_lock); | |
182 | ||
183 | QDEBUG("removing instance %p (queuenum=%u) from hash\n", | |
184 | inst, inst->queue_num); | |
185 | hlist_del(&inst->hlist); | |
186 | ||
187 | if (lock) | |
188 | write_unlock_bh(&instances_lock); | |
189 | ||
190 | /* then flush all pending skbs from the queue */ | |
191 | nfqnl_flush(inst, NF_DROP); | |
192 | ||
838ab636 HW |
193 | /* and finally put the refcount */ |
194 | instance_put(inst); | |
7af4cc3f HW |
195 | |
196 | module_put(THIS_MODULE); | |
197 | } | |
198 | ||
199 | static inline void | |
200 | __instance_destroy(struct nfqnl_instance *inst) | |
201 | { | |
202 | _instance_destroy2(inst, 0); | |
203 | } | |
204 | ||
205 | static inline void | |
206 | instance_destroy(struct nfqnl_instance *inst) | |
207 | { | |
208 | _instance_destroy2(inst, 1); | |
209 | } | |
210 | ||
211 | ||
212 | ||
213 | static void | |
214 | issue_verdict(struct nfqnl_queue_entry *entry, int verdict) | |
215 | { | |
216 | QDEBUG("entering for entry %p, verdict %u\n", entry, verdict); | |
217 | ||
218 | /* TCP input path (and probably other bits) assume to be called | |
219 | * from softirq context, not from syscall, like issue_verdict is | |
220 | * called. TCP input path deadlocks with locks taken from timer | |
221 | * softirq, e.g. We therefore emulate this by local_bh_disable() */ | |
222 | ||
223 | local_bh_disable(); | |
224 | nf_reinject(entry->skb, entry->info, verdict); | |
225 | local_bh_enable(); | |
226 | ||
227 | kfree(entry); | |
228 | } | |
229 | ||
230 | static inline void | |
231 | __enqueue_entry(struct nfqnl_instance *queue, | |
232 | struct nfqnl_queue_entry *entry) | |
233 | { | |
0ac41e81 | 234 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
235 | queue->queue_total++; |
236 | } | |
237 | ||
238 | /* | |
239 | * Find and return a queued entry matched by cmpfn, or return the last | |
240 | * entry if cmpfn is NULL. | |
241 | */ | |
242 | static inline struct nfqnl_queue_entry * | |
601e68e1 | 243 | __find_entry(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
7af4cc3f HW |
244 | unsigned long data) |
245 | { | |
0ac41e81 | 246 | struct nfqnl_queue_entry *entry; |
601e68e1 | 247 | |
0ac41e81 | 248 | list_for_each_entry(entry, &queue->queue_list, list) { |
7af4cc3f HW |
249 | if (!cmpfn || cmpfn(entry, data)) |
250 | return entry; | |
251 | } | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | static inline void | |
256 | __dequeue_entry(struct nfqnl_instance *q, struct nfqnl_queue_entry *entry) | |
257 | { | |
258 | list_del(&entry->list); | |
259 | q->queue_total--; | |
260 | } | |
261 | ||
262 | static inline struct nfqnl_queue_entry * | |
263 | __find_dequeue_entry(struct nfqnl_instance *queue, | |
264 | nfqnl_cmpfn cmpfn, unsigned long data) | |
265 | { | |
266 | struct nfqnl_queue_entry *entry; | |
267 | ||
268 | entry = __find_entry(queue, cmpfn, data); | |
269 | if (entry == NULL) | |
270 | return NULL; | |
271 | ||
272 | __dequeue_entry(queue, entry); | |
273 | return entry; | |
274 | } | |
275 | ||
276 | ||
277 | static inline void | |
278 | __nfqnl_flush(struct nfqnl_instance *queue, int verdict) | |
279 | { | |
280 | struct nfqnl_queue_entry *entry; | |
601e68e1 | 281 | |
7af4cc3f HW |
282 | while ((entry = __find_dequeue_entry(queue, NULL, 0))) |
283 | issue_verdict(entry, verdict); | |
284 | } | |
285 | ||
286 | static inline int | |
287 | __nfqnl_set_mode(struct nfqnl_instance *queue, | |
288 | unsigned char mode, unsigned int range) | |
289 | { | |
290 | int status = 0; | |
601e68e1 | 291 | |
7af4cc3f HW |
292 | switch (mode) { |
293 | case NFQNL_COPY_NONE: | |
294 | case NFQNL_COPY_META: | |
295 | queue->copy_mode = mode; | |
296 | queue->copy_range = 0; | |
297 | break; | |
601e68e1 | 298 | |
7af4cc3f HW |
299 | case NFQNL_COPY_PACKET: |
300 | queue->copy_mode = mode; | |
df6fb868 | 301 | /* we're using struct nlattr which has 16bit nla_len */ |
7af4cc3f HW |
302 | if (range > 0xffff) |
303 | queue->copy_range = 0xffff; | |
304 | else | |
305 | queue->copy_range = range; | |
306 | break; | |
601e68e1 | 307 | |
7af4cc3f HW |
308 | default: |
309 | status = -EINVAL; | |
310 | ||
311 | } | |
312 | return status; | |
313 | } | |
314 | ||
315 | static struct nfqnl_queue_entry * | |
316 | find_dequeue_entry(struct nfqnl_instance *queue, | |
317 | nfqnl_cmpfn cmpfn, unsigned long data) | |
318 | { | |
319 | struct nfqnl_queue_entry *entry; | |
601e68e1 | 320 | |
7af4cc3f HW |
321 | spin_lock_bh(&queue->lock); |
322 | entry = __find_dequeue_entry(queue, cmpfn, data); | |
323 | spin_unlock_bh(&queue->lock); | |
324 | ||
325 | return entry; | |
326 | } | |
327 | ||
328 | static void | |
329 | nfqnl_flush(struct nfqnl_instance *queue, int verdict) | |
330 | { | |
331 | spin_lock_bh(&queue->lock); | |
332 | __nfqnl_flush(queue, verdict); | |
333 | spin_unlock_bh(&queue->lock); | |
334 | } | |
335 | ||
336 | static struct sk_buff * | |
337 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
338 | struct nfqnl_queue_entry *entry, int *errp) | |
339 | { | |
27a884dc | 340 | sk_buff_data_t old_tail; |
7af4cc3f HW |
341 | size_t size; |
342 | size_t data_len = 0; | |
343 | struct sk_buff *skb; | |
344 | struct nfqnl_msg_packet_hdr pmsg; | |
345 | struct nlmsghdr *nlh; | |
346 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
347 | struct nf_info *entinf = entry->info; |
348 | struct sk_buff *entskb = entry->skb; | |
349 | struct net_device *indev; | |
350 | struct net_device *outdev; | |
98a4a861 | 351 | __be32 tmp_uint; |
7af4cc3f HW |
352 | |
353 | QDEBUG("entered\n"); | |
354 | ||
df6fb868 PM |
355 | size = NLMSG_ALIGN(sizeof(struct nfgenmsg)) |
356 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) | |
357 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
358 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 359 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
360 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
361 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 362 | #endif |
df6fb868 PM |
363 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
364 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
365 | + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 366 | |
3e4ead4f JJ |
367 | outdev = entinf->outdev; |
368 | ||
7af4cc3f | 369 | spin_lock_bh(&queue->lock); |
601e68e1 | 370 | |
7af4cc3f HW |
371 | switch (queue->copy_mode) { |
372 | case NFQNL_COPY_META: | |
373 | case NFQNL_COPY_NONE: | |
374 | data_len = 0; | |
375 | break; | |
601e68e1 | 376 | |
7af4cc3f | 377 | case NFQNL_COPY_PACKET: |
84fa7933 PM |
378 | if ((entskb->ip_summed == CHECKSUM_PARTIAL || |
379 | entskb->ip_summed == CHECKSUM_COMPLETE) && | |
380 | (*errp = skb_checksum_help(entskb))) { | |
e7dfb09a PM |
381 | spin_unlock_bh(&queue->lock); |
382 | return NULL; | |
383 | } | |
601e68e1 | 384 | if (queue->copy_range == 0 |
3e4ead4f JJ |
385 | || queue->copy_range > entskb->len) |
386 | data_len = entskb->len; | |
7af4cc3f HW |
387 | else |
388 | data_len = queue->copy_range; | |
601e68e1 | 389 | |
df6fb868 | 390 | size += nla_total_size(data_len); |
7af4cc3f | 391 | break; |
601e68e1 | 392 | |
7af4cc3f HW |
393 | default: |
394 | *errp = -EINVAL; | |
395 | spin_unlock_bh(&queue->lock); | |
396 | return NULL; | |
397 | } | |
398 | ||
399 | spin_unlock_bh(&queue->lock); | |
400 | ||
401 | skb = alloc_skb(size, GFP_ATOMIC); | |
402 | if (!skb) | |
403 | goto nlmsg_failure; | |
601e68e1 | 404 | |
27a884dc | 405 | old_tail = skb->tail; |
601e68e1 | 406 | nlh = NLMSG_PUT(skb, 0, 0, |
7af4cc3f HW |
407 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
408 | sizeof(struct nfgenmsg)); | |
409 | nfmsg = NLMSG_DATA(nlh); | |
3e4ead4f | 410 | nfmsg->nfgen_family = entinf->pf; |
7af4cc3f HW |
411 | nfmsg->version = NFNETLINK_V0; |
412 | nfmsg->res_id = htons(queue->queue_num); | |
413 | ||
414 | pmsg.packet_id = htonl(entry->id); | |
febf0a43 | 415 | pmsg.hw_protocol = entskb->protocol; |
3e4ead4f | 416 | pmsg.hook = entinf->hook; |
7af4cc3f | 417 | |
df6fb868 | 418 | NLA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg); |
7af4cc3f | 419 | |
3e4ead4f JJ |
420 | indev = entinf->indev; |
421 | if (indev) { | |
422 | tmp_uint = htonl(indev->ifindex); | |
fbcd923c | 423 | #ifndef CONFIG_BRIDGE_NETFILTER |
df6fb868 | 424 | NLA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c | 425 | #else |
3e4ead4f | 426 | if (entinf->pf == PF_BRIDGE) { |
fbcd923c | 427 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 428 | * look for bridge group (when called from |
fbcd923c | 429 | * netfilter_bridge) */ |
df6fb868 | 430 | NLA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, sizeof(tmp_uint), |
fbcd923c HW |
431 | &tmp_uint); |
432 | /* this is the bridge group "brX" */ | |
3e4ead4f | 433 | tmp_uint = htonl(indev->br_port->br->dev->ifindex); |
df6fb868 | 434 | NLA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), |
fbcd923c HW |
435 | &tmp_uint); |
436 | } else { | |
437 | /* Case 2: indev is bridge group, we need to look for | |
438 | * physical device (when called from ipv4) */ | |
df6fb868 | 439 | NLA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), |
fbcd923c | 440 | &tmp_uint); |
3e4ead4f JJ |
441 | if (entskb->nf_bridge |
442 | && entskb->nf_bridge->physindev) { | |
443 | tmp_uint = htonl(entskb->nf_bridge->physindev->ifindex); | |
df6fb868 | 444 | NLA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, |
fbcd923c HW |
445 | sizeof(tmp_uint), &tmp_uint); |
446 | } | |
447 | } | |
448 | #endif | |
7af4cc3f HW |
449 | } |
450 | ||
3e4ead4f JJ |
451 | if (outdev) { |
452 | tmp_uint = htonl(outdev->ifindex); | |
fbcd923c | 453 | #ifndef CONFIG_BRIDGE_NETFILTER |
df6fb868 | 454 | NLA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c | 455 | #else |
3e4ead4f | 456 | if (entinf->pf == PF_BRIDGE) { |
fbcd923c | 457 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 458 | * look for bridge group (when called from |
fbcd923c | 459 | * netfilter_bridge) */ |
df6fb868 | 460 | NLA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, sizeof(tmp_uint), |
fbcd923c HW |
461 | &tmp_uint); |
462 | /* this is the bridge group "brX" */ | |
3e4ead4f | 463 | tmp_uint = htonl(outdev->br_port->br->dev->ifindex); |
df6fb868 | 464 | NLA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
fbcd923c HW |
465 | &tmp_uint); |
466 | } else { | |
467 | /* Case 2: outdev is bridge group, we need to look for | |
468 | * physical output device (when called from ipv4) */ | |
df6fb868 | 469 | NLA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
fbcd923c | 470 | &tmp_uint); |
3e4ead4f JJ |
471 | if (entskb->nf_bridge |
472 | && entskb->nf_bridge->physoutdev) { | |
473 | tmp_uint = htonl(entskb->nf_bridge->physoutdev->ifindex); | |
df6fb868 | 474 | NLA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, |
fbcd923c HW |
475 | sizeof(tmp_uint), &tmp_uint); |
476 | } | |
477 | } | |
478 | #endif | |
7af4cc3f HW |
479 | } |
480 | ||
82e91ffe TG |
481 | if (entskb->mark) { |
482 | tmp_uint = htonl(entskb->mark); | |
df6fb868 | 483 | NLA_PUT(skb, NFQA_MARK, sizeof(u_int32_t), &tmp_uint); |
7af4cc3f HW |
484 | } |
485 | ||
b95cce35 | 486 | if (indev && entskb->dev) { |
7af4cc3f | 487 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
488 | int len = dev_parse_header(entskb, phw.hw_addr); |
489 | if (len) { | |
490 | phw.hw_addrlen = htons(len); | |
df6fb868 | 491 | NLA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); |
b95cce35 | 492 | } |
7af4cc3f HW |
493 | } |
494 | ||
b7aa0bf7 | 495 | if (entskb->tstamp.tv64) { |
7af4cc3f | 496 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
497 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
498 | ts.sec = cpu_to_be64(tv.tv_sec); | |
499 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 500 | |
df6fb868 | 501 | NLA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts); |
7af4cc3f HW |
502 | } |
503 | ||
504 | if (data_len) { | |
df6fb868 PM |
505 | struct nlattr *nla; |
506 | int size = nla_attr_size(data_len); | |
7af4cc3f | 507 | |
df6fb868 | 508 | if (skb_tailroom(skb) < nla_total_size(data_len)) { |
7af4cc3f HW |
509 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
510 | goto nlmsg_failure; | |
511 | } | |
512 | ||
df6fb868 PM |
513 | nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len)); |
514 | nla->nla_type = NFQA_PAYLOAD; | |
515 | nla->nla_len = size; | |
7af4cc3f | 516 | |
df6fb868 | 517 | if (skb_copy_bits(entskb, 0, nla_data(nla), data_len)) |
7af4cc3f HW |
518 | BUG(); |
519 | } | |
601e68e1 | 520 | |
7af4cc3f HW |
521 | nlh->nlmsg_len = skb->tail - old_tail; |
522 | return skb; | |
523 | ||
524 | nlmsg_failure: | |
df6fb868 | 525 | nla_put_failure: |
7af4cc3f HW |
526 | if (skb) |
527 | kfree_skb(skb); | |
528 | *errp = -EINVAL; | |
529 | if (net_ratelimit()) | |
530 | printk(KERN_ERR "nf_queue: error creating packet message\n"); | |
531 | return NULL; | |
532 | } | |
533 | ||
534 | static int | |
601e68e1 | 535 | nfqnl_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
f9d8928f | 536 | unsigned int queuenum) |
7af4cc3f HW |
537 | { |
538 | int status = -EINVAL; | |
539 | struct sk_buff *nskb; | |
540 | struct nfqnl_instance *queue; | |
541 | struct nfqnl_queue_entry *entry; | |
542 | ||
543 | QDEBUG("entered\n"); | |
544 | ||
838ab636 | 545 | queue = instance_lookup_get(queuenum); |
7af4cc3f HW |
546 | if (!queue) { |
547 | QDEBUG("no queue instance matching\n"); | |
548 | return -EINVAL; | |
549 | } | |
550 | ||
551 | if (queue->copy_mode == NFQNL_COPY_NONE) { | |
552 | QDEBUG("mode COPY_NONE, aborting\n"); | |
838ab636 HW |
553 | status = -EAGAIN; |
554 | goto err_out_put; | |
7af4cc3f HW |
555 | } |
556 | ||
557 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
558 | if (entry == NULL) { | |
559 | if (net_ratelimit()) | |
601e68e1 | 560 | printk(KERN_ERR |
7af4cc3f | 561 | "nf_queue: OOM in nfqnl_enqueue_packet()\n"); |
838ab636 HW |
562 | status = -ENOMEM; |
563 | goto err_out_put; | |
7af4cc3f HW |
564 | } |
565 | ||
566 | entry->info = info; | |
567 | entry->skb = skb; | |
568 | entry->id = atomic_inc_return(&queue->id_sequence); | |
569 | ||
570 | nskb = nfqnl_build_packet_message(queue, entry, &status); | |
571 | if (nskb == NULL) | |
572 | goto err_out_free; | |
601e68e1 | 573 | |
7af4cc3f | 574 | spin_lock_bh(&queue->lock); |
601e68e1 | 575 | |
7af4cc3f | 576 | if (!queue->peer_pid) |
601e68e1 | 577 | goto err_out_free_nskb; |
7af4cc3f HW |
578 | |
579 | if (queue->queue_total >= queue->queue_maxlen) { | |
601e68e1 | 580 | queue->queue_dropped++; |
7af4cc3f HW |
581 | status = -ENOSPC; |
582 | if (net_ratelimit()) | |
601e68e1 YH |
583 | printk(KERN_WARNING "nf_queue: full at %d entries, " |
584 | "dropping packets(s). Dropped: %d\n", | |
7af4cc3f HW |
585 | queue->queue_total, queue->queue_dropped); |
586 | goto err_out_free_nskb; | |
587 | } | |
588 | ||
589 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
590 | status = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT); | |
591 | if (status < 0) { | |
601e68e1 | 592 | queue->queue_user_dropped++; |
7af4cc3f HW |
593 | goto err_out_unlock; |
594 | } | |
595 | ||
596 | __enqueue_entry(queue, entry); | |
597 | ||
598 | spin_unlock_bh(&queue->lock); | |
838ab636 | 599 | instance_put(queue); |
7af4cc3f HW |
600 | return status; |
601 | ||
602 | err_out_free_nskb: | |
601e68e1 YH |
603 | kfree_skb(nskb); |
604 | ||
7af4cc3f HW |
605 | err_out_unlock: |
606 | spin_unlock_bh(&queue->lock); | |
607 | ||
608 | err_out_free: | |
609 | kfree(entry); | |
838ab636 HW |
610 | err_out_put: |
611 | instance_put(queue); | |
7af4cc3f HW |
612 | return status; |
613 | } | |
614 | ||
615 | static int | |
616 | nfqnl_mangle(void *data, int data_len, struct nfqnl_queue_entry *e) | |
617 | { | |
618 | int diff; | |
2ca7b0ac | 619 | int err; |
7af4cc3f HW |
620 | |
621 | diff = data_len - e->skb->len; | |
d8a585d7 PM |
622 | if (diff < 0) { |
623 | if (pskb_trim(e->skb, data_len)) | |
624 | return -ENOMEM; | |
625 | } else if (diff > 0) { | |
7af4cc3f HW |
626 | if (data_len > 0xFFFF) |
627 | return -EINVAL; | |
628 | if (diff > skb_tailroom(e->skb)) { | |
2ca7b0ac HX |
629 | err = pskb_expand_head(e->skb, 0, |
630 | diff - skb_tailroom(e->skb), | |
631 | GFP_ATOMIC); | |
632 | if (err) { | |
1158ba27 | 633 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 634 | "in mangle, dropping packet\n"); |
2ca7b0ac | 635 | return err; |
7af4cc3f | 636 | } |
7af4cc3f HW |
637 | } |
638 | skb_put(e->skb, diff); | |
639 | } | |
37d41879 | 640 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 641 | return -ENOMEM; |
27d7ff46 | 642 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 643 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
644 | return 0; |
645 | } | |
646 | ||
647 | static inline int | |
648 | id_cmp(struct nfqnl_queue_entry *e, unsigned long id) | |
649 | { | |
650 | return (id == e->id); | |
651 | } | |
652 | ||
653 | static int | |
654 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
655 | unsigned char mode, unsigned int range) | |
656 | { | |
657 | int status; | |
658 | ||
659 | spin_lock_bh(&queue->lock); | |
660 | status = __nfqnl_set_mode(queue, mode, range); | |
661 | spin_unlock_bh(&queue->lock); | |
662 | ||
663 | return status; | |
664 | } | |
665 | ||
666 | static int | |
667 | dev_cmp(struct nfqnl_queue_entry *entry, unsigned long ifindex) | |
668 | { | |
3e4ead4f | 669 | struct nf_info *entinf = entry->info; |
601e68e1 | 670 | |
3e4ead4f JJ |
671 | if (entinf->indev) |
672 | if (entinf->indev->ifindex == ifindex) | |
7af4cc3f | 673 | return 1; |
3e4ead4f JJ |
674 | if (entinf->outdev) |
675 | if (entinf->outdev->ifindex == ifindex) | |
7af4cc3f | 676 | return 1; |
ef47c6a7 PM |
677 | #ifdef CONFIG_BRIDGE_NETFILTER |
678 | if (entry->skb->nf_bridge) { | |
679 | if (entry->skb->nf_bridge->physindev && | |
680 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
681 | return 1; | |
682 | if (entry->skb->nf_bridge->physoutdev && | |
683 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
684 | return 1; | |
685 | } | |
686 | #endif | |
7af4cc3f HW |
687 | return 0; |
688 | } | |
689 | ||
690 | /* drop all packets with either indev or outdev == ifindex from all queue | |
691 | * instances */ | |
692 | static void | |
693 | nfqnl_dev_drop(int ifindex) | |
694 | { | |
695 | int i; | |
601e68e1 | 696 | |
7af4cc3f HW |
697 | QDEBUG("entering for ifindex %u\n", ifindex); |
698 | ||
699 | /* this only looks like we have to hold the readlock for a way too long | |
700 | * time, issue_verdict(), nf_reinject(), ... - but we always only | |
701 | * issue NF_DROP, which is processed directly in nf_reinject() */ | |
702 | read_lock_bh(&instances_lock); | |
703 | ||
704 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
705 | struct hlist_node *tmp; | |
706 | struct nfqnl_instance *inst; | |
707 | struct hlist_head *head = &instance_table[i]; | |
708 | ||
709 | hlist_for_each_entry(inst, tmp, head, hlist) { | |
710 | struct nfqnl_queue_entry *entry; | |
601e68e1 | 711 | while ((entry = find_dequeue_entry(inst, dev_cmp, |
7af4cc3f HW |
712 | ifindex)) != NULL) |
713 | issue_verdict(entry, NF_DROP); | |
714 | } | |
715 | } | |
716 | ||
717 | read_unlock_bh(&instances_lock); | |
718 | } | |
719 | ||
720 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
721 | ||
722 | static int | |
723 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
724 | unsigned long event, void *ptr) | |
725 | { | |
726 | struct net_device *dev = ptr; | |
727 | ||
e9dc8653 EB |
728 | if (dev->nd_net != &init_net) |
729 | return NOTIFY_DONE; | |
730 | ||
7af4cc3f HW |
731 | /* Drop any packets associated with the downed device */ |
732 | if (event == NETDEV_DOWN) | |
733 | nfqnl_dev_drop(dev->ifindex); | |
734 | return NOTIFY_DONE; | |
735 | } | |
736 | ||
737 | static struct notifier_block nfqnl_dev_notifier = { | |
738 | .notifier_call = nfqnl_rcv_dev_event, | |
739 | }; | |
740 | ||
741 | static int | |
742 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
743 | unsigned long event, void *ptr) | |
744 | { | |
745 | struct netlink_notify *n = ptr; | |
746 | ||
747 | if (event == NETLINK_URELEASE && | |
748 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
749 | int i; | |
750 | ||
751 | /* destroy all instances for this pid */ | |
752 | write_lock_bh(&instances_lock); | |
753 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
754 | struct hlist_node *tmp, *t2; | |
755 | struct nfqnl_instance *inst; | |
756 | struct hlist_head *head = &instance_table[i]; | |
757 | ||
758 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
759 | if ((n->net == &init_net) && |
760 | (n->pid == inst->peer_pid)) | |
7af4cc3f HW |
761 | __instance_destroy(inst); |
762 | } | |
763 | } | |
764 | write_unlock_bh(&instances_lock); | |
765 | } | |
766 | return NOTIFY_DONE; | |
767 | } | |
768 | ||
769 | static struct notifier_block nfqnl_rtnl_notifier = { | |
770 | .notifier_call = nfqnl_rcv_nl_event, | |
771 | }; | |
772 | ||
5bf75853 PM |
773 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
774 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
775 | [NFQA_MARK] = { .type = NLA_U32 }, | |
776 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
838ab636 HW |
777 | }; |
778 | ||
7af4cc3f HW |
779 | static int |
780 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 781 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
782 | { |
783 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
784 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
785 | ||
786 | struct nfqnl_msg_verdict_hdr *vhdr; | |
787 | struct nfqnl_instance *queue; | |
788 | unsigned int verdict; | |
789 | struct nfqnl_queue_entry *entry; | |
838ab636 | 790 | int err; |
7af4cc3f | 791 | |
838ab636 | 792 | queue = instance_lookup_get(queue_num); |
7af4cc3f HW |
793 | if (!queue) |
794 | return -ENODEV; | |
795 | ||
838ab636 HW |
796 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
797 | err = -EPERM; | |
798 | goto err_out_put; | |
799 | } | |
7af4cc3f | 800 | |
df6fb868 | 801 | if (!nfqa[NFQA_VERDICT_HDR]) { |
838ab636 HW |
802 | err = -EINVAL; |
803 | goto err_out_put; | |
804 | } | |
7af4cc3f | 805 | |
df6fb868 | 806 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); |
7af4cc3f HW |
807 | verdict = ntohl(vhdr->verdict); |
808 | ||
838ab636 HW |
809 | if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) { |
810 | err = -EINVAL; | |
811 | goto err_out_put; | |
812 | } | |
7af4cc3f HW |
813 | |
814 | entry = find_dequeue_entry(queue, id_cmp, ntohl(vhdr->id)); | |
838ab636 HW |
815 | if (entry == NULL) { |
816 | err = -ENOENT; | |
817 | goto err_out_put; | |
818 | } | |
7af4cc3f | 819 | |
df6fb868 PM |
820 | if (nfqa[NFQA_PAYLOAD]) { |
821 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), | |
822 | nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0) | |
7af4cc3f HW |
823 | verdict = NF_DROP; |
824 | } | |
825 | ||
df6fb868 | 826 | if (nfqa[NFQA_MARK]) |
82e91ffe | 827 | entry->skb->mark = ntohl(*(__be32 *) |
df6fb868 | 828 | nla_data(nfqa[NFQA_MARK])); |
601e68e1 | 829 | |
7af4cc3f | 830 | issue_verdict(entry, verdict); |
838ab636 | 831 | instance_put(queue); |
7af4cc3f | 832 | return 0; |
838ab636 HW |
833 | |
834 | err_out_put: | |
835 | instance_put(queue); | |
836 | return err; | |
7af4cc3f HW |
837 | } |
838 | ||
839 | static int | |
840 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 841 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
842 | { |
843 | return -ENOTSUPP; | |
844 | } | |
845 | ||
5bf75853 PM |
846 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
847 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
848 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
849 | }; |
850 | ||
e3ac5298 | 851 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
852 | .name = "nf_queue", |
853 | .outfn = &nfqnl_enqueue_packet, | |
854 | }; | |
855 | ||
7af4cc3f HW |
856 | static int |
857 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 858 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
859 | { |
860 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
861 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
862 | struct nfqnl_instance *queue; | |
838ab636 | 863 | int ret = 0; |
7af4cc3f HW |
864 | |
865 | QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); | |
866 | ||
838ab636 | 867 | queue = instance_lookup_get(queue_num); |
df6fb868 | 868 | if (nfqa[NFQA_CFG_CMD]) { |
7af4cc3f | 869 | struct nfqnl_msg_config_cmd *cmd; |
df6fb868 | 870 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); |
7af4cc3f HW |
871 | QDEBUG("found CFG_CMD\n"); |
872 | ||
873 | switch (cmd->command) { | |
874 | case NFQNL_CFG_CMD_BIND: | |
875 | if (queue) | |
876 | return -EBUSY; | |
877 | ||
878 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); | |
879 | if (!queue) | |
880 | return -EINVAL; | |
881 | break; | |
882 | case NFQNL_CFG_CMD_UNBIND: | |
883 | if (!queue) | |
884 | return -ENODEV; | |
885 | ||
838ab636 HW |
886 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
887 | ret = -EPERM; | |
888 | goto out_put; | |
889 | } | |
7af4cc3f HW |
890 | |
891 | instance_destroy(queue); | |
892 | break; | |
893 | case NFQNL_CFG_CMD_PF_BIND: | |
894 | QDEBUG("registering queue handler for pf=%u\n", | |
895 | ntohs(cmd->pf)); | |
bbd86b9f | 896 | ret = nf_register_queue_handler(ntohs(cmd->pf), &nfqh); |
7af4cc3f HW |
897 | break; |
898 | case NFQNL_CFG_CMD_PF_UNBIND: | |
899 | QDEBUG("unregistering queue handler for pf=%u\n", | |
900 | ntohs(cmd->pf)); | |
ce7663d8 | 901 | ret = nf_unregister_queue_handler(ntohs(cmd->pf), &nfqh); |
7af4cc3f HW |
902 | break; |
903 | default: | |
838ab636 HW |
904 | ret = -EINVAL; |
905 | break; | |
7af4cc3f HW |
906 | } |
907 | } else { | |
908 | if (!queue) { | |
909 | QDEBUG("no config command, and no instance ENOENT\n"); | |
838ab636 HW |
910 | ret = -ENOENT; |
911 | goto out_put; | |
7af4cc3f HW |
912 | } |
913 | ||
914 | if (queue->peer_pid != NETLINK_CB(skb).pid) { | |
915 | QDEBUG("no config command, and wrong pid\n"); | |
838ab636 HW |
916 | ret = -EPERM; |
917 | goto out_put; | |
7af4cc3f HW |
918 | } |
919 | } | |
920 | ||
df6fb868 | 921 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 922 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 923 | |
406dbfc9 PM |
924 | if (!queue) { |
925 | ret = -ENOENT; | |
926 | goto out_put; | |
927 | } | |
df6fb868 | 928 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
929 | nfqnl_set_mode(queue, params->copy_mode, |
930 | ntohl(params->copy_range)); | |
931 | } | |
932 | ||
df6fb868 | 933 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 934 | __be32 *queue_maxlen; |
df6fb868 | 935 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
936 | spin_lock_bh(&queue->lock); |
937 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
938 | spin_unlock_bh(&queue->lock); | |
939 | } | |
940 | ||
838ab636 HW |
941 | out_put: |
942 | instance_put(queue); | |
943 | return ret; | |
7af4cc3f HW |
944 | } |
945 | ||
7c8d4cb4 | 946 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
7af4cc3f | 947 | [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp, |
37d2e7a2 | 948 | .attr_count = NFQA_MAX, }, |
7af4cc3f | 949 | [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict, |
5bf75853 PM |
950 | .attr_count = NFQA_MAX, |
951 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 952 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
953 | .attr_count = NFQA_CFG_MAX, |
954 | .policy = nfqa_cfg_policy }, | |
7af4cc3f HW |
955 | }; |
956 | ||
7c8d4cb4 | 957 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
958 | .name = "nf_queue", |
959 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
960 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
961 | .cb = nfqnl_cb, |
962 | }; | |
963 | ||
838ab636 HW |
964 | #ifdef CONFIG_PROC_FS |
965 | struct iter_state { | |
966 | unsigned int bucket; | |
967 | }; | |
968 | ||
969 | static struct hlist_node *get_first(struct seq_file *seq) | |
970 | { | |
971 | struct iter_state *st = seq->private; | |
972 | ||
973 | if (!st) | |
974 | return NULL; | |
975 | ||
976 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
977 | if (!hlist_empty(&instance_table[st->bucket])) | |
978 | return instance_table[st->bucket].first; | |
979 | } | |
980 | return NULL; | |
981 | } | |
982 | ||
983 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
984 | { | |
985 | struct iter_state *st = seq->private; | |
986 | ||
987 | h = h->next; | |
988 | while (!h) { | |
989 | if (++st->bucket >= INSTANCE_BUCKETS) | |
990 | return NULL; | |
991 | ||
992 | h = instance_table[st->bucket].first; | |
993 | } | |
994 | return h; | |
995 | } | |
996 | ||
997 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
998 | { | |
999 | struct hlist_node *head; | |
1000 | head = get_first(seq); | |
1001 | ||
1002 | if (head) | |
1003 | while (pos && (head = get_next(seq, head))) | |
1004 | pos--; | |
1005 | return pos ? NULL : head; | |
1006 | } | |
1007 | ||
1008 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
1009 | { | |
1010 | read_lock_bh(&instances_lock); | |
1011 | return get_idx(seq, *pos); | |
1012 | } | |
1013 | ||
1014 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1015 | { | |
1016 | (*pos)++; | |
1017 | return get_next(s, v); | |
1018 | } | |
1019 | ||
1020 | static void seq_stop(struct seq_file *s, void *v) | |
1021 | { | |
1022 | read_unlock_bh(&instances_lock); | |
1023 | } | |
1024 | ||
1025 | static int seq_show(struct seq_file *s, void *v) | |
1026 | { | |
1027 | const struct nfqnl_instance *inst = v; | |
1028 | ||
1029 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1030 | inst->queue_num, | |
1031 | inst->peer_pid, inst->queue_total, | |
1032 | inst->copy_mode, inst->copy_range, | |
1033 | inst->queue_dropped, inst->queue_user_dropped, | |
1034 | atomic_read(&inst->id_sequence), | |
1035 | atomic_read(&inst->use)); | |
1036 | } | |
1037 | ||
56b3d975 | 1038 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1039 | .start = seq_start, |
1040 | .next = seq_next, | |
1041 | .stop = seq_stop, | |
1042 | .show = seq_show, | |
1043 | }; | |
1044 | ||
1045 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1046 | { | |
e2da5913 PE |
1047 | return seq_open_private(file, &nfqnl_seq_ops, |
1048 | sizeof(struct iter_state)); | |
838ab636 HW |
1049 | } |
1050 | ||
da7071d7 | 1051 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1052 | .owner = THIS_MODULE, |
1053 | .open = nfqnl_open, | |
1054 | .read = seq_read, | |
1055 | .llseek = seq_lseek, | |
1056 | .release = seq_release_private, | |
1057 | }; | |
1058 | ||
1059 | #endif /* PROC_FS */ | |
1060 | ||
32292a7f | 1061 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 1062 | { |
838ab636 HW |
1063 | int i, status = -ENOMEM; |
1064 | #ifdef CONFIG_PROC_FS | |
1065 | struct proc_dir_entry *proc_nfqueue; | |
1066 | #endif | |
601e68e1 | 1067 | |
838ab636 HW |
1068 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1069 | INIT_HLIST_HEAD(&instance_table[i]); | |
1070 | ||
7af4cc3f HW |
1071 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1072 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1073 | if (status < 0) { | |
1074 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
1075 | goto cleanup_netlink_notifier; | |
1076 | } | |
1077 | ||
838ab636 HW |
1078 | #ifdef CONFIG_PROC_FS |
1079 | proc_nfqueue = create_proc_entry("nfnetlink_queue", 0440, | |
1080 | proc_net_netfilter); | |
1081 | if (!proc_nfqueue) | |
1082 | goto cleanup_subsys; | |
1083 | proc_nfqueue->proc_fops = &nfqnl_file_ops; | |
1084 | #endif | |
1085 | ||
7af4cc3f HW |
1086 | register_netdevice_notifier(&nfqnl_dev_notifier); |
1087 | return status; | |
1088 | ||
838ab636 HW |
1089 | #ifdef CONFIG_PROC_FS |
1090 | cleanup_subsys: | |
7af4cc3f | 1091 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 1092 | #endif |
7af4cc3f HW |
1093 | cleanup_netlink_notifier: |
1094 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1095 | return status; | |
1096 | } | |
1097 | ||
65b4b4e8 | 1098 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1099 | { |
32292a7f PM |
1100 | nf_unregister_queue_handlers(&nfqh); |
1101 | unregister_netdevice_notifier(&nfqnl_dev_notifier); | |
1102 | #ifdef CONFIG_PROC_FS | |
1103 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
1104 | #endif | |
1105 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
1106 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
7af4cc3f HW |
1107 | } |
1108 | ||
1109 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1110 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1111 | MODULE_LICENSE("GPL"); | |
1112 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1113 | ||
65b4b4e8 AM |
1114 | module_init(nfnetlink_queue_init); |
1115 | module_exit(nfnetlink_queue_fini); |