]>
Commit | Line | Data |
---|---|---|
7af4cc3f HW |
1 | /* |
2 | * This is a module which is used for queueing packets and communicating with | |
3 | * userspace via nfetlink. | |
4 | * | |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
6 | * | |
7 | * Based on the old ipv4-only ip_queue.c: | |
8 | * (C) 2000-2002 James Morris <jmorris@intercode.com.au> | |
9 | * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | * | |
15 | */ | |
16 | #include <linux/module.h> | |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/notifier.h> | |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/netfilter.h> | |
838ab636 | 23 | #include <linux/proc_fs.h> |
7af4cc3f HW |
24 | #include <linux/netfilter_ipv4.h> |
25 | #include <linux/netfilter_ipv6.h> | |
26 | #include <linux/netfilter/nfnetlink.h> | |
27 | #include <linux/netfilter/nfnetlink_queue.h> | |
28 | #include <linux/list.h> | |
29 | #include <net/sock.h> | |
30 | ||
31 | #include <asm/atomic.h> | |
32 | ||
fbcd923c HW |
33 | #ifdef CONFIG_BRIDGE_NETFILTER |
34 | #include "../bridge/br_private.h" | |
35 | #endif | |
36 | ||
7af4cc3f HW |
37 | #define NFQNL_QMAX_DEFAULT 1024 |
38 | ||
39 | #if 0 | |
40 | #define QDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \ | |
41 | __FILE__, __LINE__, __FUNCTION__, \ | |
42 | ## args) | |
43 | #else | |
44 | #define QDEBUG(x, ...) | |
45 | #endif | |
46 | ||
47 | struct nfqnl_queue_entry { | |
48 | struct list_head list; | |
49 | struct nf_info *info; | |
50 | struct sk_buff *skb; | |
51 | unsigned int id; | |
52 | }; | |
53 | ||
54 | struct nfqnl_instance { | |
55 | struct hlist_node hlist; /* global list of queues */ | |
838ab636 | 56 | atomic_t use; |
7af4cc3f HW |
57 | |
58 | int peer_pid; | |
59 | unsigned int queue_maxlen; | |
60 | unsigned int copy_range; | |
61 | unsigned int queue_total; | |
62 | unsigned int queue_dropped; | |
63 | unsigned int queue_user_dropped; | |
64 | ||
65 | atomic_t id_sequence; /* 'sequence' of pkt ids */ | |
66 | ||
67 | u_int16_t queue_num; /* number of this queue */ | |
68 | u_int8_t copy_mode; | |
69 | ||
70 | spinlock_t lock; | |
71 | ||
72 | struct list_head queue_list; /* packets in queue */ | |
73 | }; | |
74 | ||
75 | typedef int (*nfqnl_cmpfn)(struct nfqnl_queue_entry *, unsigned long); | |
76 | ||
77 | static DEFINE_RWLOCK(instances_lock); | |
78 | ||
7af4cc3f HW |
79 | #define INSTANCE_BUCKETS 16 |
80 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
81 | ||
82 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
83 | { | |
84 | return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS; | |
85 | } | |
86 | ||
87 | static struct nfqnl_instance * | |
88 | __instance_lookup(u_int16_t queue_num) | |
89 | { | |
90 | struct hlist_head *head; | |
91 | struct hlist_node *pos; | |
92 | struct nfqnl_instance *inst; | |
93 | ||
94 | head = &instance_table[instance_hashfn(queue_num)]; | |
95 | hlist_for_each_entry(inst, pos, head, hlist) { | |
96 | if (inst->queue_num == queue_num) | |
97 | return inst; | |
98 | } | |
99 | return NULL; | |
100 | } | |
101 | ||
102 | static struct nfqnl_instance * | |
838ab636 | 103 | instance_lookup_get(u_int16_t queue_num) |
7af4cc3f HW |
104 | { |
105 | struct nfqnl_instance *inst; | |
106 | ||
107 | read_lock_bh(&instances_lock); | |
108 | inst = __instance_lookup(queue_num); | |
838ab636 HW |
109 | if (inst) |
110 | atomic_inc(&inst->use); | |
7af4cc3f HW |
111 | read_unlock_bh(&instances_lock); |
112 | ||
113 | return inst; | |
114 | } | |
115 | ||
838ab636 HW |
116 | static void |
117 | instance_put(struct nfqnl_instance *inst) | |
118 | { | |
119 | if (inst && atomic_dec_and_test(&inst->use)) { | |
120 | QDEBUG("kfree(inst=%p)\n", inst); | |
121 | kfree(inst); | |
122 | } | |
123 | } | |
124 | ||
7af4cc3f HW |
125 | static struct nfqnl_instance * |
126 | instance_create(u_int16_t queue_num, int pid) | |
127 | { | |
128 | struct nfqnl_instance *inst; | |
129 | ||
130 | QDEBUG("entering for queue_num=%u, pid=%d\n", queue_num, pid); | |
131 | ||
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; | |
df6fb868 | 302 | /* we're using struct nlattr which has 16bit nla_len */ |
7af4cc3f HW |
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 | ||
df6fb868 PM |
356 | size = NLMSG_ALIGN(sizeof(struct nfgenmsg)) |
357 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) | |
358 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
359 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 360 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
361 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
362 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 363 | #endif |
df6fb868 PM |
364 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
365 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
366 | + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 367 | |
3e4ead4f JJ |
368 | outdev = entinf->outdev; |
369 | ||
7af4cc3f | 370 | spin_lock_bh(&queue->lock); |
601e68e1 | 371 | |
7af4cc3f HW |
372 | switch (queue->copy_mode) { |
373 | case NFQNL_COPY_META: | |
374 | case NFQNL_COPY_NONE: | |
375 | data_len = 0; | |
376 | break; | |
601e68e1 | 377 | |
7af4cc3f | 378 | case NFQNL_COPY_PACKET: |
84fa7933 PM |
379 | if ((entskb->ip_summed == CHECKSUM_PARTIAL || |
380 | entskb->ip_summed == CHECKSUM_COMPLETE) && | |
381 | (*errp = skb_checksum_help(entskb))) { | |
e7dfb09a PM |
382 | spin_unlock_bh(&queue->lock); |
383 | return NULL; | |
384 | } | |
601e68e1 | 385 | if (queue->copy_range == 0 |
3e4ead4f JJ |
386 | || queue->copy_range > entskb->len) |
387 | data_len = entskb->len; | |
7af4cc3f HW |
388 | else |
389 | data_len = queue->copy_range; | |
601e68e1 | 390 | |
df6fb868 | 391 | size += nla_total_size(data_len); |
7af4cc3f | 392 | break; |
601e68e1 | 393 | |
7af4cc3f HW |
394 | default: |
395 | *errp = -EINVAL; | |
396 | spin_unlock_bh(&queue->lock); | |
397 | return NULL; | |
398 | } | |
399 | ||
400 | spin_unlock_bh(&queue->lock); | |
401 | ||
402 | skb = alloc_skb(size, GFP_ATOMIC); | |
403 | if (!skb) | |
404 | goto nlmsg_failure; | |
601e68e1 | 405 | |
27a884dc | 406 | old_tail = skb->tail; |
601e68e1 | 407 | nlh = NLMSG_PUT(skb, 0, 0, |
7af4cc3f HW |
408 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
409 | sizeof(struct nfgenmsg)); | |
410 | nfmsg = NLMSG_DATA(nlh); | |
3e4ead4f | 411 | nfmsg->nfgen_family = entinf->pf; |
7af4cc3f HW |
412 | nfmsg->version = NFNETLINK_V0; |
413 | nfmsg->res_id = htons(queue->queue_num); | |
414 | ||
415 | pmsg.packet_id = htonl(entry->id); | |
febf0a43 | 416 | pmsg.hw_protocol = entskb->protocol; |
3e4ead4f | 417 | pmsg.hook = entinf->hook; |
7af4cc3f | 418 | |
df6fb868 | 419 | NLA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg); |
7af4cc3f | 420 | |
3e4ead4f JJ |
421 | indev = entinf->indev; |
422 | if (indev) { | |
423 | tmp_uint = htonl(indev->ifindex); | |
fbcd923c | 424 | #ifndef CONFIG_BRIDGE_NETFILTER |
df6fb868 | 425 | NLA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c | 426 | #else |
3e4ead4f | 427 | if (entinf->pf == PF_BRIDGE) { |
fbcd923c | 428 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 429 | * look for bridge group (when called from |
fbcd923c | 430 | * netfilter_bridge) */ |
df6fb868 | 431 | NLA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, sizeof(tmp_uint), |
fbcd923c HW |
432 | &tmp_uint); |
433 | /* this is the bridge group "brX" */ | |
3e4ead4f | 434 | tmp_uint = htonl(indev->br_port->br->dev->ifindex); |
df6fb868 | 435 | NLA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), |
fbcd923c HW |
436 | &tmp_uint); |
437 | } else { | |
438 | /* Case 2: indev is bridge group, we need to look for | |
439 | * physical device (when called from ipv4) */ | |
df6fb868 | 440 | NLA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), |
fbcd923c | 441 | &tmp_uint); |
3e4ead4f JJ |
442 | if (entskb->nf_bridge |
443 | && entskb->nf_bridge->physindev) { | |
444 | tmp_uint = htonl(entskb->nf_bridge->physindev->ifindex); | |
df6fb868 | 445 | NLA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, |
fbcd923c HW |
446 | sizeof(tmp_uint), &tmp_uint); |
447 | } | |
448 | } | |
449 | #endif | |
7af4cc3f HW |
450 | } |
451 | ||
3e4ead4f JJ |
452 | if (outdev) { |
453 | tmp_uint = htonl(outdev->ifindex); | |
fbcd923c | 454 | #ifndef CONFIG_BRIDGE_NETFILTER |
df6fb868 | 455 | NLA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c | 456 | #else |
3e4ead4f | 457 | if (entinf->pf == PF_BRIDGE) { |
fbcd923c | 458 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 459 | * look for bridge group (when called from |
fbcd923c | 460 | * netfilter_bridge) */ |
df6fb868 | 461 | NLA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, sizeof(tmp_uint), |
fbcd923c HW |
462 | &tmp_uint); |
463 | /* this is the bridge group "brX" */ | |
3e4ead4f | 464 | tmp_uint = htonl(outdev->br_port->br->dev->ifindex); |
df6fb868 | 465 | NLA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
fbcd923c HW |
466 | &tmp_uint); |
467 | } else { | |
468 | /* Case 2: outdev is bridge group, we need to look for | |
469 | * physical output device (when called from ipv4) */ | |
df6fb868 | 470 | NLA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
fbcd923c | 471 | &tmp_uint); |
3e4ead4f JJ |
472 | if (entskb->nf_bridge |
473 | && entskb->nf_bridge->physoutdev) { | |
474 | tmp_uint = htonl(entskb->nf_bridge->physoutdev->ifindex); | |
df6fb868 | 475 | NLA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, |
fbcd923c HW |
476 | sizeof(tmp_uint), &tmp_uint); |
477 | } | |
478 | } | |
479 | #endif | |
7af4cc3f HW |
480 | } |
481 | ||
82e91ffe TG |
482 | if (entskb->mark) { |
483 | tmp_uint = htonl(entskb->mark); | |
df6fb868 | 484 | NLA_PUT(skb, NFQA_MARK, sizeof(u_int32_t), &tmp_uint); |
7af4cc3f HW |
485 | } |
486 | ||
b95cce35 | 487 | if (indev && entskb->dev) { |
7af4cc3f | 488 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
489 | int len = dev_parse_header(entskb, phw.hw_addr); |
490 | if (len) { | |
491 | phw.hw_addrlen = htons(len); | |
df6fb868 | 492 | NLA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); |
b95cce35 | 493 | } |
7af4cc3f HW |
494 | } |
495 | ||
b7aa0bf7 | 496 | if (entskb->tstamp.tv64) { |
7af4cc3f | 497 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
498 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
499 | ts.sec = cpu_to_be64(tv.tv_sec); | |
500 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 501 | |
df6fb868 | 502 | NLA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts); |
7af4cc3f HW |
503 | } |
504 | ||
505 | if (data_len) { | |
df6fb868 PM |
506 | struct nlattr *nla; |
507 | int size = nla_attr_size(data_len); | |
7af4cc3f | 508 | |
df6fb868 | 509 | if (skb_tailroom(skb) < nla_total_size(data_len)) { |
7af4cc3f HW |
510 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
511 | goto nlmsg_failure; | |
512 | } | |
513 | ||
df6fb868 PM |
514 | nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len)); |
515 | nla->nla_type = NFQA_PAYLOAD; | |
516 | nla->nla_len = size; | |
7af4cc3f | 517 | |
df6fb868 | 518 | if (skb_copy_bits(entskb, 0, nla_data(nla), data_len)) |
7af4cc3f HW |
519 | BUG(); |
520 | } | |
601e68e1 | 521 | |
7af4cc3f HW |
522 | nlh->nlmsg_len = skb->tail - old_tail; |
523 | return skb; | |
524 | ||
525 | nlmsg_failure: | |
df6fb868 | 526 | nla_put_failure: |
7af4cc3f HW |
527 | if (skb) |
528 | kfree_skb(skb); | |
529 | *errp = -EINVAL; | |
530 | if (net_ratelimit()) | |
531 | printk(KERN_ERR "nf_queue: error creating packet message\n"); | |
532 | return NULL; | |
533 | } | |
534 | ||
535 | static int | |
601e68e1 | 536 | nfqnl_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
f9d8928f | 537 | unsigned int queuenum) |
7af4cc3f HW |
538 | { |
539 | int status = -EINVAL; | |
540 | struct sk_buff *nskb; | |
541 | struct nfqnl_instance *queue; | |
542 | struct nfqnl_queue_entry *entry; | |
543 | ||
544 | QDEBUG("entered\n"); | |
545 | ||
838ab636 | 546 | queue = instance_lookup_get(queuenum); |
7af4cc3f HW |
547 | if (!queue) { |
548 | QDEBUG("no queue instance matching\n"); | |
549 | return -EINVAL; | |
550 | } | |
551 | ||
552 | if (queue->copy_mode == NFQNL_COPY_NONE) { | |
553 | QDEBUG("mode COPY_NONE, aborting\n"); | |
838ab636 HW |
554 | status = -EAGAIN; |
555 | goto err_out_put; | |
7af4cc3f HW |
556 | } |
557 | ||
558 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
559 | if (entry == NULL) { | |
560 | if (net_ratelimit()) | |
601e68e1 | 561 | printk(KERN_ERR |
7af4cc3f | 562 | "nf_queue: OOM in nfqnl_enqueue_packet()\n"); |
838ab636 HW |
563 | status = -ENOMEM; |
564 | goto err_out_put; | |
7af4cc3f HW |
565 | } |
566 | ||
567 | entry->info = info; | |
568 | entry->skb = skb; | |
569 | entry->id = atomic_inc_return(&queue->id_sequence); | |
570 | ||
571 | nskb = nfqnl_build_packet_message(queue, entry, &status); | |
572 | if (nskb == NULL) | |
573 | goto err_out_free; | |
601e68e1 | 574 | |
7af4cc3f | 575 | spin_lock_bh(&queue->lock); |
601e68e1 | 576 | |
7af4cc3f | 577 | if (!queue->peer_pid) |
601e68e1 | 578 | goto err_out_free_nskb; |
7af4cc3f HW |
579 | |
580 | if (queue->queue_total >= queue->queue_maxlen) { | |
601e68e1 | 581 | queue->queue_dropped++; |
7af4cc3f HW |
582 | status = -ENOSPC; |
583 | if (net_ratelimit()) | |
601e68e1 YH |
584 | printk(KERN_WARNING "nf_queue: full at %d entries, " |
585 | "dropping packets(s). Dropped: %d\n", | |
7af4cc3f HW |
586 | queue->queue_total, queue->queue_dropped); |
587 | goto err_out_free_nskb; | |
588 | } | |
589 | ||
590 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
591 | status = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT); | |
592 | if (status < 0) { | |
601e68e1 | 593 | queue->queue_user_dropped++; |
7af4cc3f HW |
594 | goto err_out_unlock; |
595 | } | |
596 | ||
597 | __enqueue_entry(queue, entry); | |
598 | ||
599 | spin_unlock_bh(&queue->lock); | |
838ab636 | 600 | instance_put(queue); |
7af4cc3f HW |
601 | return status; |
602 | ||
603 | err_out_free_nskb: | |
601e68e1 YH |
604 | kfree_skb(nskb); |
605 | ||
7af4cc3f HW |
606 | err_out_unlock: |
607 | spin_unlock_bh(&queue->lock); | |
608 | ||
609 | err_out_free: | |
610 | kfree(entry); | |
838ab636 HW |
611 | err_out_put: |
612 | instance_put(queue); | |
7af4cc3f HW |
613 | return status; |
614 | } | |
615 | ||
616 | static int | |
617 | nfqnl_mangle(void *data, int data_len, struct nfqnl_queue_entry *e) | |
618 | { | |
619 | int diff; | |
2ca7b0ac | 620 | int err; |
7af4cc3f HW |
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)) { | |
2ca7b0ac HX |
630 | err = pskb_expand_head(e->skb, 0, |
631 | diff - skb_tailroom(e->skb), | |
632 | GFP_ATOMIC); | |
633 | if (err) { | |
1158ba27 | 634 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 635 | "in mangle, dropping packet\n"); |
2ca7b0ac | 636 | return err; |
7af4cc3f | 637 | } |
7af4cc3f HW |
638 | } |
639 | skb_put(e->skb, diff); | |
640 | } | |
37d41879 | 641 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 642 | return -ENOMEM; |
27d7ff46 | 643 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 644 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
645 | return 0; |
646 | } | |
647 | ||
648 | static inline int | |
649 | id_cmp(struct nfqnl_queue_entry *e, unsigned long id) | |
650 | { | |
651 | return (id == e->id); | |
652 | } | |
653 | ||
654 | static int | |
655 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
656 | unsigned char mode, unsigned int range) | |
657 | { | |
658 | int status; | |
659 | ||
660 | spin_lock_bh(&queue->lock); | |
661 | status = __nfqnl_set_mode(queue, mode, range); | |
662 | spin_unlock_bh(&queue->lock); | |
663 | ||
664 | return status; | |
665 | } | |
666 | ||
667 | static int | |
668 | dev_cmp(struct nfqnl_queue_entry *entry, unsigned long ifindex) | |
669 | { | |
3e4ead4f | 670 | struct nf_info *entinf = entry->info; |
601e68e1 | 671 | |
3e4ead4f JJ |
672 | if (entinf->indev) |
673 | if (entinf->indev->ifindex == ifindex) | |
7af4cc3f | 674 | return 1; |
3e4ead4f JJ |
675 | if (entinf->outdev) |
676 | if (entinf->outdev->ifindex == ifindex) | |
7af4cc3f | 677 | return 1; |
ef47c6a7 PM |
678 | #ifdef CONFIG_BRIDGE_NETFILTER |
679 | if (entry->skb->nf_bridge) { | |
680 | if (entry->skb->nf_bridge->physindev && | |
681 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
682 | return 1; | |
683 | if (entry->skb->nf_bridge->physoutdev && | |
684 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
685 | return 1; | |
686 | } | |
687 | #endif | |
7af4cc3f HW |
688 | return 0; |
689 | } | |
690 | ||
691 | /* drop all packets with either indev or outdev == ifindex from all queue | |
692 | * instances */ | |
693 | static void | |
694 | nfqnl_dev_drop(int ifindex) | |
695 | { | |
696 | int i; | |
601e68e1 | 697 | |
7af4cc3f HW |
698 | QDEBUG("entering for ifindex %u\n", ifindex); |
699 | ||
700 | /* this only looks like we have to hold the readlock for a way too long | |
701 | * time, issue_verdict(), nf_reinject(), ... - but we always only | |
702 | * issue NF_DROP, which is processed directly in nf_reinject() */ | |
703 | read_lock_bh(&instances_lock); | |
704 | ||
705 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
706 | struct hlist_node *tmp; | |
707 | struct nfqnl_instance *inst; | |
708 | struct hlist_head *head = &instance_table[i]; | |
709 | ||
710 | hlist_for_each_entry(inst, tmp, head, hlist) { | |
711 | struct nfqnl_queue_entry *entry; | |
601e68e1 | 712 | while ((entry = find_dequeue_entry(inst, dev_cmp, |
7af4cc3f HW |
713 | ifindex)) != NULL) |
714 | issue_verdict(entry, NF_DROP); | |
715 | } | |
716 | } | |
717 | ||
718 | read_unlock_bh(&instances_lock); | |
719 | } | |
720 | ||
721 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
722 | ||
723 | static int | |
724 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
725 | unsigned long event, void *ptr) | |
726 | { | |
727 | struct net_device *dev = ptr; | |
728 | ||
e9dc8653 EB |
729 | if (dev->nd_net != &init_net) |
730 | return NOTIFY_DONE; | |
731 | ||
7af4cc3f HW |
732 | /* Drop any packets associated with the downed device */ |
733 | if (event == NETDEV_DOWN) | |
734 | nfqnl_dev_drop(dev->ifindex); | |
735 | return NOTIFY_DONE; | |
736 | } | |
737 | ||
738 | static struct notifier_block nfqnl_dev_notifier = { | |
739 | .notifier_call = nfqnl_rcv_dev_event, | |
740 | }; | |
741 | ||
742 | static int | |
743 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
744 | unsigned long event, void *ptr) | |
745 | { | |
746 | struct netlink_notify *n = ptr; | |
747 | ||
748 | if (event == NETLINK_URELEASE && | |
749 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
750 | int i; | |
751 | ||
752 | /* destroy all instances for this pid */ | |
753 | write_lock_bh(&instances_lock); | |
754 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
755 | struct hlist_node *tmp, *t2; | |
756 | struct nfqnl_instance *inst; | |
757 | struct hlist_head *head = &instance_table[i]; | |
758 | ||
759 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
760 | if ((n->net == &init_net) && |
761 | (n->pid == inst->peer_pid)) | |
7af4cc3f HW |
762 | __instance_destroy(inst); |
763 | } | |
764 | } | |
765 | write_unlock_bh(&instances_lock); | |
766 | } | |
767 | return NOTIFY_DONE; | |
768 | } | |
769 | ||
770 | static struct notifier_block nfqnl_rtnl_notifier = { | |
771 | .notifier_call = nfqnl_rcv_nl_event, | |
772 | }; | |
773 | ||
5bf75853 PM |
774 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
775 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
776 | [NFQA_MARK] = { .type = NLA_U32 }, | |
777 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
838ab636 HW |
778 | }; |
779 | ||
7af4cc3f HW |
780 | static int |
781 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 782 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
783 | { |
784 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
785 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
786 | ||
787 | struct nfqnl_msg_verdict_hdr *vhdr; | |
788 | struct nfqnl_instance *queue; | |
789 | unsigned int verdict; | |
790 | struct nfqnl_queue_entry *entry; | |
838ab636 | 791 | int err; |
7af4cc3f | 792 | |
838ab636 | 793 | queue = instance_lookup_get(queue_num); |
7af4cc3f HW |
794 | if (!queue) |
795 | return -ENODEV; | |
796 | ||
838ab636 HW |
797 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
798 | err = -EPERM; | |
799 | goto err_out_put; | |
800 | } | |
7af4cc3f | 801 | |
df6fb868 | 802 | if (!nfqa[NFQA_VERDICT_HDR]) { |
838ab636 HW |
803 | err = -EINVAL; |
804 | goto err_out_put; | |
805 | } | |
7af4cc3f | 806 | |
df6fb868 | 807 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); |
7af4cc3f HW |
808 | verdict = ntohl(vhdr->verdict); |
809 | ||
838ab636 HW |
810 | if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) { |
811 | err = -EINVAL; | |
812 | goto err_out_put; | |
813 | } | |
7af4cc3f HW |
814 | |
815 | entry = find_dequeue_entry(queue, id_cmp, ntohl(vhdr->id)); | |
838ab636 HW |
816 | if (entry == NULL) { |
817 | err = -ENOENT; | |
818 | goto err_out_put; | |
819 | } | |
7af4cc3f | 820 | |
df6fb868 PM |
821 | if (nfqa[NFQA_PAYLOAD]) { |
822 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), | |
823 | nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0) | |
7af4cc3f HW |
824 | verdict = NF_DROP; |
825 | } | |
826 | ||
df6fb868 | 827 | if (nfqa[NFQA_MARK]) |
82e91ffe | 828 | entry->skb->mark = ntohl(*(__be32 *) |
df6fb868 | 829 | nla_data(nfqa[NFQA_MARK])); |
601e68e1 | 830 | |
7af4cc3f | 831 | issue_verdict(entry, verdict); |
838ab636 | 832 | instance_put(queue); |
7af4cc3f | 833 | return 0; |
838ab636 HW |
834 | |
835 | err_out_put: | |
836 | instance_put(queue); | |
837 | return err; | |
7af4cc3f HW |
838 | } |
839 | ||
840 | static int | |
841 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 842 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
843 | { |
844 | return -ENOTSUPP; | |
845 | } | |
846 | ||
5bf75853 PM |
847 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
848 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
849 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
850 | }; |
851 | ||
e3ac5298 | 852 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
853 | .name = "nf_queue", |
854 | .outfn = &nfqnl_enqueue_packet, | |
855 | }; | |
856 | ||
7af4cc3f HW |
857 | static int |
858 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 859 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
860 | { |
861 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
862 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
863 | struct nfqnl_instance *queue; | |
838ab636 | 864 | int ret = 0; |
7af4cc3f HW |
865 | |
866 | QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); | |
867 | ||
838ab636 | 868 | queue = instance_lookup_get(queue_num); |
df6fb868 | 869 | if (nfqa[NFQA_CFG_CMD]) { |
7af4cc3f | 870 | struct nfqnl_msg_config_cmd *cmd; |
df6fb868 | 871 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); |
7af4cc3f HW |
872 | QDEBUG("found CFG_CMD\n"); |
873 | ||
874 | switch (cmd->command) { | |
875 | case NFQNL_CFG_CMD_BIND: | |
876 | if (queue) | |
877 | return -EBUSY; | |
878 | ||
879 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); | |
880 | if (!queue) | |
881 | return -EINVAL; | |
882 | break; | |
883 | case NFQNL_CFG_CMD_UNBIND: | |
884 | if (!queue) | |
885 | return -ENODEV; | |
886 | ||
838ab636 HW |
887 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
888 | ret = -EPERM; | |
889 | goto out_put; | |
890 | } | |
7af4cc3f HW |
891 | |
892 | instance_destroy(queue); | |
893 | break; | |
894 | case NFQNL_CFG_CMD_PF_BIND: | |
895 | QDEBUG("registering queue handler for pf=%u\n", | |
896 | ntohs(cmd->pf)); | |
bbd86b9f | 897 | ret = nf_register_queue_handler(ntohs(cmd->pf), &nfqh); |
7af4cc3f HW |
898 | break; |
899 | case NFQNL_CFG_CMD_PF_UNBIND: | |
900 | QDEBUG("unregistering queue handler for pf=%u\n", | |
901 | ntohs(cmd->pf)); | |
ce7663d8 | 902 | ret = nf_unregister_queue_handler(ntohs(cmd->pf), &nfqh); |
7af4cc3f HW |
903 | break; |
904 | default: | |
838ab636 HW |
905 | ret = -EINVAL; |
906 | break; | |
7af4cc3f HW |
907 | } |
908 | } else { | |
909 | if (!queue) { | |
910 | QDEBUG("no config command, and no instance ENOENT\n"); | |
838ab636 HW |
911 | ret = -ENOENT; |
912 | goto out_put; | |
7af4cc3f HW |
913 | } |
914 | ||
915 | if (queue->peer_pid != NETLINK_CB(skb).pid) { | |
916 | QDEBUG("no config command, and wrong pid\n"); | |
838ab636 HW |
917 | ret = -EPERM; |
918 | goto out_put; | |
7af4cc3f HW |
919 | } |
920 | } | |
921 | ||
df6fb868 | 922 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 923 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 924 | |
406dbfc9 PM |
925 | if (!queue) { |
926 | ret = -ENOENT; | |
927 | goto out_put; | |
928 | } | |
df6fb868 | 929 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
930 | nfqnl_set_mode(queue, params->copy_mode, |
931 | ntohl(params->copy_range)); | |
932 | } | |
933 | ||
df6fb868 | 934 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 935 | __be32 *queue_maxlen; |
df6fb868 | 936 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
937 | spin_lock_bh(&queue->lock); |
938 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
939 | spin_unlock_bh(&queue->lock); | |
940 | } | |
941 | ||
838ab636 HW |
942 | out_put: |
943 | instance_put(queue); | |
944 | return ret; | |
7af4cc3f HW |
945 | } |
946 | ||
7c8d4cb4 | 947 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
7af4cc3f | 948 | [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp, |
37d2e7a2 | 949 | .attr_count = NFQA_MAX, }, |
7af4cc3f | 950 | [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict, |
5bf75853 PM |
951 | .attr_count = NFQA_MAX, |
952 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 953 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
954 | .attr_count = NFQA_CFG_MAX, |
955 | .policy = nfqa_cfg_policy }, | |
7af4cc3f HW |
956 | }; |
957 | ||
7c8d4cb4 | 958 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
959 | .name = "nf_queue", |
960 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
961 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
962 | .cb = nfqnl_cb, |
963 | }; | |
964 | ||
838ab636 HW |
965 | #ifdef CONFIG_PROC_FS |
966 | struct iter_state { | |
967 | unsigned int bucket; | |
968 | }; | |
969 | ||
970 | static struct hlist_node *get_first(struct seq_file *seq) | |
971 | { | |
972 | struct iter_state *st = seq->private; | |
973 | ||
974 | if (!st) | |
975 | return NULL; | |
976 | ||
977 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
978 | if (!hlist_empty(&instance_table[st->bucket])) | |
979 | return instance_table[st->bucket].first; | |
980 | } | |
981 | return NULL; | |
982 | } | |
983 | ||
984 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
985 | { | |
986 | struct iter_state *st = seq->private; | |
987 | ||
988 | h = h->next; | |
989 | while (!h) { | |
990 | if (++st->bucket >= INSTANCE_BUCKETS) | |
991 | return NULL; | |
992 | ||
993 | h = instance_table[st->bucket].first; | |
994 | } | |
995 | return h; | |
996 | } | |
997 | ||
998 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
999 | { | |
1000 | struct hlist_node *head; | |
1001 | head = get_first(seq); | |
1002 | ||
1003 | if (head) | |
1004 | while (pos && (head = get_next(seq, head))) | |
1005 | pos--; | |
1006 | return pos ? NULL : head; | |
1007 | } | |
1008 | ||
1009 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
1010 | { | |
1011 | read_lock_bh(&instances_lock); | |
1012 | return get_idx(seq, *pos); | |
1013 | } | |
1014 | ||
1015 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1016 | { | |
1017 | (*pos)++; | |
1018 | return get_next(s, v); | |
1019 | } | |
1020 | ||
1021 | static void seq_stop(struct seq_file *s, void *v) | |
1022 | { | |
1023 | read_unlock_bh(&instances_lock); | |
1024 | } | |
1025 | ||
1026 | static int seq_show(struct seq_file *s, void *v) | |
1027 | { | |
1028 | const struct nfqnl_instance *inst = v; | |
1029 | ||
1030 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1031 | inst->queue_num, | |
1032 | inst->peer_pid, inst->queue_total, | |
1033 | inst->copy_mode, inst->copy_range, | |
1034 | inst->queue_dropped, inst->queue_user_dropped, | |
1035 | atomic_read(&inst->id_sequence), | |
1036 | atomic_read(&inst->use)); | |
1037 | } | |
1038 | ||
56b3d975 | 1039 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1040 | .start = seq_start, |
1041 | .next = seq_next, | |
1042 | .stop = seq_stop, | |
1043 | .show = seq_show, | |
1044 | }; | |
1045 | ||
1046 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1047 | { | |
e2da5913 PE |
1048 | return seq_open_private(file, &nfqnl_seq_ops, |
1049 | sizeof(struct iter_state)); | |
838ab636 HW |
1050 | } |
1051 | ||
da7071d7 | 1052 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1053 | .owner = THIS_MODULE, |
1054 | .open = nfqnl_open, | |
1055 | .read = seq_read, | |
1056 | .llseek = seq_lseek, | |
1057 | .release = seq_release_private, | |
1058 | }; | |
1059 | ||
1060 | #endif /* PROC_FS */ | |
1061 | ||
32292a7f | 1062 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 1063 | { |
838ab636 HW |
1064 | int i, status = -ENOMEM; |
1065 | #ifdef CONFIG_PROC_FS | |
1066 | struct proc_dir_entry *proc_nfqueue; | |
1067 | #endif | |
601e68e1 | 1068 | |
838ab636 HW |
1069 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1070 | INIT_HLIST_HEAD(&instance_table[i]); | |
1071 | ||
7af4cc3f HW |
1072 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1073 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1074 | if (status < 0) { | |
1075 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
1076 | goto cleanup_netlink_notifier; | |
1077 | } | |
1078 | ||
838ab636 HW |
1079 | #ifdef CONFIG_PROC_FS |
1080 | proc_nfqueue = create_proc_entry("nfnetlink_queue", 0440, | |
1081 | proc_net_netfilter); | |
1082 | if (!proc_nfqueue) | |
1083 | goto cleanup_subsys; | |
1084 | proc_nfqueue->proc_fops = &nfqnl_file_ops; | |
1085 | #endif | |
1086 | ||
7af4cc3f HW |
1087 | register_netdevice_notifier(&nfqnl_dev_notifier); |
1088 | return status; | |
1089 | ||
838ab636 HW |
1090 | #ifdef CONFIG_PROC_FS |
1091 | cleanup_subsys: | |
7af4cc3f | 1092 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 1093 | #endif |
7af4cc3f HW |
1094 | cleanup_netlink_notifier: |
1095 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1096 | return status; | |
1097 | } | |
1098 | ||
65b4b4e8 | 1099 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1100 | { |
32292a7f PM |
1101 | nf_unregister_queue_handlers(&nfqh); |
1102 | unregister_netdevice_notifier(&nfqnl_dev_notifier); | |
1103 | #ifdef CONFIG_PROC_FS | |
1104 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
1105 | #endif | |
1106 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
1107 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
7af4cc3f HW |
1108 | } |
1109 | ||
1110 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1111 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1112 | MODULE_LICENSE("GPL"); | |
1113 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1114 | ||
65b4b4e8 AM |
1115 | module_init(nfnetlink_queue_init); |
1116 | module_exit(nfnetlink_queue_fini); |