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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 | ||
b43d8d85 PM |
174 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
175 | unsigned long data); | |
7af4cc3f HW |
176 | |
177 | static void | |
178 | _instance_destroy2(struct nfqnl_instance *inst, int lock) | |
179 | { | |
180 | /* first pull it out of the global list */ | |
181 | if (lock) | |
182 | write_lock_bh(&instances_lock); | |
183 | ||
184 | QDEBUG("removing instance %p (queuenum=%u) from hash\n", | |
185 | inst, inst->queue_num); | |
186 | hlist_del(&inst->hlist); | |
187 | ||
188 | if (lock) | |
189 | write_unlock_bh(&instances_lock); | |
190 | ||
191 | /* then flush all pending skbs from the queue */ | |
b43d8d85 | 192 | nfqnl_flush(inst, NULL, 0); |
7af4cc3f | 193 | |
838ab636 HW |
194 | /* and finally put the refcount */ |
195 | instance_put(inst); | |
7af4cc3f HW |
196 | |
197 | module_put(THIS_MODULE); | |
198 | } | |
199 | ||
200 | static inline void | |
201 | __instance_destroy(struct nfqnl_instance *inst) | |
202 | { | |
203 | _instance_destroy2(inst, 0); | |
204 | } | |
205 | ||
206 | static inline void | |
207 | instance_destroy(struct nfqnl_instance *inst) | |
208 | { | |
209 | _instance_destroy2(inst, 1); | |
210 | } | |
211 | ||
212 | ||
213 | ||
214 | static void | |
215 | issue_verdict(struct nfqnl_queue_entry *entry, int verdict) | |
216 | { | |
217 | QDEBUG("entering for entry %p, verdict %u\n", entry, verdict); | |
218 | ||
219 | /* TCP input path (and probably other bits) assume to be called | |
220 | * from softirq context, not from syscall, like issue_verdict is | |
221 | * called. TCP input path deadlocks with locks taken from timer | |
222 | * softirq, e.g. We therefore emulate this by local_bh_disable() */ | |
223 | ||
224 | local_bh_disable(); | |
225 | nf_reinject(entry->skb, entry->info, verdict); | |
226 | local_bh_enable(); | |
227 | ||
228 | kfree(entry); | |
229 | } | |
230 | ||
231 | static inline void | |
232 | __enqueue_entry(struct nfqnl_instance *queue, | |
233 | struct nfqnl_queue_entry *entry) | |
234 | { | |
0ac41e81 | 235 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
236 | queue->queue_total++; |
237 | } | |
238 | ||
7af4cc3f HW |
239 | static inline int |
240 | __nfqnl_set_mode(struct nfqnl_instance *queue, | |
241 | unsigned char mode, unsigned int range) | |
242 | { | |
243 | int status = 0; | |
601e68e1 | 244 | |
7af4cc3f HW |
245 | switch (mode) { |
246 | case NFQNL_COPY_NONE: | |
247 | case NFQNL_COPY_META: | |
248 | queue->copy_mode = mode; | |
249 | queue->copy_range = 0; | |
250 | break; | |
601e68e1 | 251 | |
7af4cc3f HW |
252 | case NFQNL_COPY_PACKET: |
253 | queue->copy_mode = mode; | |
df6fb868 | 254 | /* we're using struct nlattr which has 16bit nla_len */ |
7af4cc3f HW |
255 | if (range > 0xffff) |
256 | queue->copy_range = 0xffff; | |
257 | else | |
258 | queue->copy_range = range; | |
259 | break; | |
601e68e1 | 260 | |
7af4cc3f HW |
261 | default: |
262 | status = -EINVAL; | |
263 | ||
264 | } | |
265 | return status; | |
266 | } | |
267 | ||
268 | static struct nfqnl_queue_entry * | |
b43d8d85 | 269 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 270 | { |
b43d8d85 | 271 | struct nfqnl_queue_entry *entry = NULL, *i; |
601e68e1 | 272 | |
7af4cc3f | 273 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
274 | |
275 | list_for_each_entry(i, &queue->queue_list, list) { | |
276 | if (i->id == id) { | |
277 | entry = i; | |
278 | break; | |
279 | } | |
280 | } | |
281 | ||
282 | if (entry) { | |
283 | list_del(&entry->list); | |
284 | queue->queue_total--; | |
285 | } | |
286 | ||
7af4cc3f HW |
287 | spin_unlock_bh(&queue->lock); |
288 | ||
289 | return entry; | |
290 | } | |
291 | ||
292 | static void | |
b43d8d85 | 293 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 294 | { |
b43d8d85 PM |
295 | struct nfqnl_queue_entry *entry, *next; |
296 | ||
7af4cc3f | 297 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
298 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
299 | if (!cmpfn || cmpfn(entry, data)) { | |
300 | list_del(&entry->list); | |
301 | queue->queue_total--; | |
302 | issue_verdict(entry, NF_DROP); | |
303 | } | |
304 | } | |
7af4cc3f HW |
305 | spin_unlock_bh(&queue->lock); |
306 | } | |
307 | ||
308 | static struct sk_buff * | |
309 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
310 | struct nfqnl_queue_entry *entry, int *errp) | |
311 | { | |
27a884dc | 312 | sk_buff_data_t old_tail; |
7af4cc3f HW |
313 | size_t size; |
314 | size_t data_len = 0; | |
315 | struct sk_buff *skb; | |
316 | struct nfqnl_msg_packet_hdr pmsg; | |
317 | struct nlmsghdr *nlh; | |
318 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
319 | struct nf_info *entinf = entry->info; |
320 | struct sk_buff *entskb = entry->skb; | |
321 | struct net_device *indev; | |
322 | struct net_device *outdev; | |
98a4a861 | 323 | __be32 tmp_uint; |
7af4cc3f HW |
324 | |
325 | QDEBUG("entered\n"); | |
326 | ||
df6fb868 PM |
327 | size = NLMSG_ALIGN(sizeof(struct nfgenmsg)) |
328 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) | |
329 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
330 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 331 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
332 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
333 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 334 | #endif |
df6fb868 PM |
335 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
336 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
337 | + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 338 | |
3e4ead4f JJ |
339 | outdev = entinf->outdev; |
340 | ||
7af4cc3f | 341 | spin_lock_bh(&queue->lock); |
601e68e1 | 342 | |
7af4cc3f HW |
343 | switch (queue->copy_mode) { |
344 | case NFQNL_COPY_META: | |
345 | case NFQNL_COPY_NONE: | |
346 | data_len = 0; | |
347 | break; | |
601e68e1 | 348 | |
7af4cc3f | 349 | case NFQNL_COPY_PACKET: |
84fa7933 PM |
350 | if ((entskb->ip_summed == CHECKSUM_PARTIAL || |
351 | entskb->ip_summed == CHECKSUM_COMPLETE) && | |
352 | (*errp = skb_checksum_help(entskb))) { | |
e7dfb09a PM |
353 | spin_unlock_bh(&queue->lock); |
354 | return NULL; | |
355 | } | |
601e68e1 | 356 | if (queue->copy_range == 0 |
3e4ead4f JJ |
357 | || queue->copy_range > entskb->len) |
358 | data_len = entskb->len; | |
7af4cc3f HW |
359 | else |
360 | data_len = queue->copy_range; | |
601e68e1 | 361 | |
df6fb868 | 362 | size += nla_total_size(data_len); |
7af4cc3f | 363 | break; |
601e68e1 | 364 | |
7af4cc3f HW |
365 | default: |
366 | *errp = -EINVAL; | |
367 | spin_unlock_bh(&queue->lock); | |
368 | return NULL; | |
369 | } | |
370 | ||
371 | spin_unlock_bh(&queue->lock); | |
372 | ||
373 | skb = alloc_skb(size, GFP_ATOMIC); | |
374 | if (!skb) | |
375 | goto nlmsg_failure; | |
601e68e1 | 376 | |
27a884dc | 377 | old_tail = skb->tail; |
601e68e1 | 378 | nlh = NLMSG_PUT(skb, 0, 0, |
7af4cc3f HW |
379 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
380 | sizeof(struct nfgenmsg)); | |
381 | nfmsg = NLMSG_DATA(nlh); | |
3e4ead4f | 382 | nfmsg->nfgen_family = entinf->pf; |
7af4cc3f HW |
383 | nfmsg->version = NFNETLINK_V0; |
384 | nfmsg->res_id = htons(queue->queue_num); | |
385 | ||
386 | pmsg.packet_id = htonl(entry->id); | |
febf0a43 | 387 | pmsg.hw_protocol = entskb->protocol; |
3e4ead4f | 388 | pmsg.hook = entinf->hook; |
7af4cc3f | 389 | |
df6fb868 | 390 | NLA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg); |
7af4cc3f | 391 | |
3e4ead4f JJ |
392 | indev = entinf->indev; |
393 | if (indev) { | |
394 | tmp_uint = htonl(indev->ifindex); | |
fbcd923c | 395 | #ifndef CONFIG_BRIDGE_NETFILTER |
df6fb868 | 396 | NLA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c | 397 | #else |
3e4ead4f | 398 | if (entinf->pf == PF_BRIDGE) { |
fbcd923c | 399 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 400 | * look for bridge group (when called from |
fbcd923c | 401 | * netfilter_bridge) */ |
df6fb868 | 402 | NLA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, sizeof(tmp_uint), |
fbcd923c HW |
403 | &tmp_uint); |
404 | /* this is the bridge group "brX" */ | |
3e4ead4f | 405 | tmp_uint = htonl(indev->br_port->br->dev->ifindex); |
df6fb868 | 406 | NLA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), |
fbcd923c HW |
407 | &tmp_uint); |
408 | } else { | |
409 | /* Case 2: indev is bridge group, we need to look for | |
410 | * physical device (when called from ipv4) */ | |
df6fb868 | 411 | NLA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), |
fbcd923c | 412 | &tmp_uint); |
3e4ead4f JJ |
413 | if (entskb->nf_bridge |
414 | && entskb->nf_bridge->physindev) { | |
415 | tmp_uint = htonl(entskb->nf_bridge->physindev->ifindex); | |
df6fb868 | 416 | NLA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, |
fbcd923c HW |
417 | sizeof(tmp_uint), &tmp_uint); |
418 | } | |
419 | } | |
420 | #endif | |
7af4cc3f HW |
421 | } |
422 | ||
3e4ead4f JJ |
423 | if (outdev) { |
424 | tmp_uint = htonl(outdev->ifindex); | |
fbcd923c | 425 | #ifndef CONFIG_BRIDGE_NETFILTER |
df6fb868 | 426 | NLA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint); |
fbcd923c | 427 | #else |
3e4ead4f | 428 | if (entinf->pf == PF_BRIDGE) { |
fbcd923c | 429 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 430 | * look for bridge group (when called from |
fbcd923c | 431 | * netfilter_bridge) */ |
df6fb868 | 432 | NLA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, sizeof(tmp_uint), |
fbcd923c HW |
433 | &tmp_uint); |
434 | /* this is the bridge group "brX" */ | |
3e4ead4f | 435 | tmp_uint = htonl(outdev->br_port->br->dev->ifindex); |
df6fb868 | 436 | NLA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
fbcd923c HW |
437 | &tmp_uint); |
438 | } else { | |
439 | /* Case 2: outdev is bridge group, we need to look for | |
440 | * physical output device (when called from ipv4) */ | |
df6fb868 | 441 | NLA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
fbcd923c | 442 | &tmp_uint); |
3e4ead4f JJ |
443 | if (entskb->nf_bridge |
444 | && entskb->nf_bridge->physoutdev) { | |
445 | tmp_uint = htonl(entskb->nf_bridge->physoutdev->ifindex); | |
df6fb868 | 446 | NLA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, |
fbcd923c HW |
447 | sizeof(tmp_uint), &tmp_uint); |
448 | } | |
449 | } | |
450 | #endif | |
7af4cc3f HW |
451 | } |
452 | ||
82e91ffe TG |
453 | if (entskb->mark) { |
454 | tmp_uint = htonl(entskb->mark); | |
df6fb868 | 455 | NLA_PUT(skb, NFQA_MARK, sizeof(u_int32_t), &tmp_uint); |
7af4cc3f HW |
456 | } |
457 | ||
b95cce35 | 458 | if (indev && entskb->dev) { |
7af4cc3f | 459 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
460 | int len = dev_parse_header(entskb, phw.hw_addr); |
461 | if (len) { | |
462 | phw.hw_addrlen = htons(len); | |
df6fb868 | 463 | NLA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); |
b95cce35 | 464 | } |
7af4cc3f HW |
465 | } |
466 | ||
b7aa0bf7 | 467 | if (entskb->tstamp.tv64) { |
7af4cc3f | 468 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
469 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
470 | ts.sec = cpu_to_be64(tv.tv_sec); | |
471 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 472 | |
df6fb868 | 473 | NLA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts); |
7af4cc3f HW |
474 | } |
475 | ||
476 | if (data_len) { | |
df6fb868 PM |
477 | struct nlattr *nla; |
478 | int size = nla_attr_size(data_len); | |
7af4cc3f | 479 | |
df6fb868 | 480 | if (skb_tailroom(skb) < nla_total_size(data_len)) { |
7af4cc3f HW |
481 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
482 | goto nlmsg_failure; | |
483 | } | |
484 | ||
df6fb868 PM |
485 | nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len)); |
486 | nla->nla_type = NFQA_PAYLOAD; | |
487 | nla->nla_len = size; | |
7af4cc3f | 488 | |
df6fb868 | 489 | if (skb_copy_bits(entskb, 0, nla_data(nla), data_len)) |
7af4cc3f HW |
490 | BUG(); |
491 | } | |
601e68e1 | 492 | |
7af4cc3f HW |
493 | nlh->nlmsg_len = skb->tail - old_tail; |
494 | return skb; | |
495 | ||
496 | nlmsg_failure: | |
df6fb868 | 497 | nla_put_failure: |
7af4cc3f HW |
498 | if (skb) |
499 | kfree_skb(skb); | |
500 | *errp = -EINVAL; | |
501 | if (net_ratelimit()) | |
502 | printk(KERN_ERR "nf_queue: error creating packet message\n"); | |
503 | return NULL; | |
504 | } | |
505 | ||
506 | static int | |
601e68e1 | 507 | nfqnl_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
f9d8928f | 508 | unsigned int queuenum) |
7af4cc3f HW |
509 | { |
510 | int status = -EINVAL; | |
511 | struct sk_buff *nskb; | |
512 | struct nfqnl_instance *queue; | |
513 | struct nfqnl_queue_entry *entry; | |
514 | ||
515 | QDEBUG("entered\n"); | |
516 | ||
838ab636 | 517 | queue = instance_lookup_get(queuenum); |
7af4cc3f HW |
518 | if (!queue) { |
519 | QDEBUG("no queue instance matching\n"); | |
520 | return -EINVAL; | |
521 | } | |
522 | ||
523 | if (queue->copy_mode == NFQNL_COPY_NONE) { | |
524 | QDEBUG("mode COPY_NONE, aborting\n"); | |
838ab636 HW |
525 | status = -EAGAIN; |
526 | goto err_out_put; | |
7af4cc3f HW |
527 | } |
528 | ||
529 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
530 | if (entry == NULL) { | |
531 | if (net_ratelimit()) | |
601e68e1 | 532 | printk(KERN_ERR |
7af4cc3f | 533 | "nf_queue: OOM in nfqnl_enqueue_packet()\n"); |
838ab636 HW |
534 | status = -ENOMEM; |
535 | goto err_out_put; | |
7af4cc3f HW |
536 | } |
537 | ||
538 | entry->info = info; | |
539 | entry->skb = skb; | |
540 | entry->id = atomic_inc_return(&queue->id_sequence); | |
541 | ||
542 | nskb = nfqnl_build_packet_message(queue, entry, &status); | |
543 | if (nskb == NULL) | |
544 | goto err_out_free; | |
601e68e1 | 545 | |
7af4cc3f | 546 | spin_lock_bh(&queue->lock); |
601e68e1 | 547 | |
7af4cc3f | 548 | if (!queue->peer_pid) |
601e68e1 | 549 | goto err_out_free_nskb; |
7af4cc3f HW |
550 | |
551 | if (queue->queue_total >= queue->queue_maxlen) { | |
601e68e1 | 552 | queue->queue_dropped++; |
7af4cc3f HW |
553 | status = -ENOSPC; |
554 | if (net_ratelimit()) | |
601e68e1 YH |
555 | printk(KERN_WARNING "nf_queue: full at %d entries, " |
556 | "dropping packets(s). Dropped: %d\n", | |
7af4cc3f HW |
557 | queue->queue_total, queue->queue_dropped); |
558 | goto err_out_free_nskb; | |
559 | } | |
560 | ||
561 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
562 | status = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT); | |
563 | if (status < 0) { | |
601e68e1 | 564 | queue->queue_user_dropped++; |
7af4cc3f HW |
565 | goto err_out_unlock; |
566 | } | |
567 | ||
568 | __enqueue_entry(queue, entry); | |
569 | ||
570 | spin_unlock_bh(&queue->lock); | |
838ab636 | 571 | instance_put(queue); |
7af4cc3f HW |
572 | return status; |
573 | ||
574 | err_out_free_nskb: | |
601e68e1 YH |
575 | kfree_skb(nskb); |
576 | ||
7af4cc3f HW |
577 | err_out_unlock: |
578 | spin_unlock_bh(&queue->lock); | |
579 | ||
580 | err_out_free: | |
581 | kfree(entry); | |
838ab636 HW |
582 | err_out_put: |
583 | instance_put(queue); | |
7af4cc3f HW |
584 | return status; |
585 | } | |
586 | ||
587 | static int | |
588 | nfqnl_mangle(void *data, int data_len, struct nfqnl_queue_entry *e) | |
589 | { | |
590 | int diff; | |
2ca7b0ac | 591 | int err; |
7af4cc3f HW |
592 | |
593 | diff = data_len - e->skb->len; | |
d8a585d7 PM |
594 | if (diff < 0) { |
595 | if (pskb_trim(e->skb, data_len)) | |
596 | return -ENOMEM; | |
597 | } else if (diff > 0) { | |
7af4cc3f HW |
598 | if (data_len > 0xFFFF) |
599 | return -EINVAL; | |
600 | if (diff > skb_tailroom(e->skb)) { | |
2ca7b0ac HX |
601 | err = pskb_expand_head(e->skb, 0, |
602 | diff - skb_tailroom(e->skb), | |
603 | GFP_ATOMIC); | |
604 | if (err) { | |
1158ba27 | 605 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 606 | "in mangle, dropping packet\n"); |
2ca7b0ac | 607 | return err; |
7af4cc3f | 608 | } |
7af4cc3f HW |
609 | } |
610 | skb_put(e->skb, diff); | |
611 | } | |
37d41879 | 612 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 613 | return -ENOMEM; |
27d7ff46 | 614 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 615 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
616 | return 0; |
617 | } | |
618 | ||
7af4cc3f HW |
619 | static int |
620 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
621 | unsigned char mode, unsigned int range) | |
622 | { | |
623 | int status; | |
624 | ||
625 | spin_lock_bh(&queue->lock); | |
626 | status = __nfqnl_set_mode(queue, mode, range); | |
627 | spin_unlock_bh(&queue->lock); | |
628 | ||
629 | return status; | |
630 | } | |
631 | ||
632 | static int | |
633 | dev_cmp(struct nfqnl_queue_entry *entry, unsigned long ifindex) | |
634 | { | |
3e4ead4f | 635 | struct nf_info *entinf = entry->info; |
601e68e1 | 636 | |
3e4ead4f JJ |
637 | if (entinf->indev) |
638 | if (entinf->indev->ifindex == ifindex) | |
7af4cc3f | 639 | return 1; |
3e4ead4f JJ |
640 | if (entinf->outdev) |
641 | if (entinf->outdev->ifindex == ifindex) | |
7af4cc3f | 642 | return 1; |
ef47c6a7 PM |
643 | #ifdef CONFIG_BRIDGE_NETFILTER |
644 | if (entry->skb->nf_bridge) { | |
645 | if (entry->skb->nf_bridge->physindev && | |
646 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
647 | return 1; | |
648 | if (entry->skb->nf_bridge->physoutdev && | |
649 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
650 | return 1; | |
651 | } | |
652 | #endif | |
7af4cc3f HW |
653 | return 0; |
654 | } | |
655 | ||
656 | /* drop all packets with either indev or outdev == ifindex from all queue | |
657 | * instances */ | |
658 | static void | |
659 | nfqnl_dev_drop(int ifindex) | |
660 | { | |
661 | int i; | |
601e68e1 | 662 | |
7af4cc3f HW |
663 | QDEBUG("entering for ifindex %u\n", ifindex); |
664 | ||
665 | /* this only looks like we have to hold the readlock for a way too long | |
666 | * time, issue_verdict(), nf_reinject(), ... - but we always only | |
667 | * issue NF_DROP, which is processed directly in nf_reinject() */ | |
668 | read_lock_bh(&instances_lock); | |
669 | ||
670 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
671 | struct hlist_node *tmp; | |
672 | struct nfqnl_instance *inst; | |
673 | struct hlist_head *head = &instance_table[i]; | |
674 | ||
b43d8d85 PM |
675 | hlist_for_each_entry(inst, tmp, head, hlist) |
676 | nfqnl_flush(inst, dev_cmp, ifindex); | |
7af4cc3f HW |
677 | } |
678 | ||
679 | read_unlock_bh(&instances_lock); | |
680 | } | |
681 | ||
682 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
683 | ||
684 | static int | |
685 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
686 | unsigned long event, void *ptr) | |
687 | { | |
688 | struct net_device *dev = ptr; | |
689 | ||
e9dc8653 EB |
690 | if (dev->nd_net != &init_net) |
691 | return NOTIFY_DONE; | |
692 | ||
7af4cc3f HW |
693 | /* Drop any packets associated with the downed device */ |
694 | if (event == NETDEV_DOWN) | |
695 | nfqnl_dev_drop(dev->ifindex); | |
696 | return NOTIFY_DONE; | |
697 | } | |
698 | ||
699 | static struct notifier_block nfqnl_dev_notifier = { | |
700 | .notifier_call = nfqnl_rcv_dev_event, | |
701 | }; | |
702 | ||
703 | static int | |
704 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
705 | unsigned long event, void *ptr) | |
706 | { | |
707 | struct netlink_notify *n = ptr; | |
708 | ||
709 | if (event == NETLINK_URELEASE && | |
710 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
711 | int i; | |
712 | ||
713 | /* destroy all instances for this pid */ | |
714 | write_lock_bh(&instances_lock); | |
715 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
716 | struct hlist_node *tmp, *t2; | |
717 | struct nfqnl_instance *inst; | |
718 | struct hlist_head *head = &instance_table[i]; | |
719 | ||
720 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
721 | if ((n->net == &init_net) && |
722 | (n->pid == inst->peer_pid)) | |
7af4cc3f HW |
723 | __instance_destroy(inst); |
724 | } | |
725 | } | |
726 | write_unlock_bh(&instances_lock); | |
727 | } | |
728 | return NOTIFY_DONE; | |
729 | } | |
730 | ||
731 | static struct notifier_block nfqnl_rtnl_notifier = { | |
732 | .notifier_call = nfqnl_rcv_nl_event, | |
733 | }; | |
734 | ||
5bf75853 PM |
735 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
736 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
737 | [NFQA_MARK] = { .type = NLA_U32 }, | |
738 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
838ab636 HW |
739 | }; |
740 | ||
7af4cc3f HW |
741 | static int |
742 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 743 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
744 | { |
745 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
746 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
747 | ||
748 | struct nfqnl_msg_verdict_hdr *vhdr; | |
749 | struct nfqnl_instance *queue; | |
750 | unsigned int verdict; | |
751 | struct nfqnl_queue_entry *entry; | |
838ab636 | 752 | int err; |
7af4cc3f | 753 | |
838ab636 | 754 | queue = instance_lookup_get(queue_num); |
7af4cc3f HW |
755 | if (!queue) |
756 | return -ENODEV; | |
757 | ||
838ab636 HW |
758 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
759 | err = -EPERM; | |
760 | goto err_out_put; | |
761 | } | |
7af4cc3f | 762 | |
df6fb868 | 763 | if (!nfqa[NFQA_VERDICT_HDR]) { |
838ab636 HW |
764 | err = -EINVAL; |
765 | goto err_out_put; | |
766 | } | |
7af4cc3f | 767 | |
df6fb868 | 768 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); |
7af4cc3f HW |
769 | verdict = ntohl(vhdr->verdict); |
770 | ||
838ab636 HW |
771 | if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) { |
772 | err = -EINVAL; | |
773 | goto err_out_put; | |
774 | } | |
7af4cc3f | 775 | |
b43d8d85 | 776 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
838ab636 HW |
777 | if (entry == NULL) { |
778 | err = -ENOENT; | |
779 | goto err_out_put; | |
780 | } | |
7af4cc3f | 781 | |
df6fb868 PM |
782 | if (nfqa[NFQA_PAYLOAD]) { |
783 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), | |
784 | nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0) | |
7af4cc3f HW |
785 | verdict = NF_DROP; |
786 | } | |
787 | ||
df6fb868 | 788 | if (nfqa[NFQA_MARK]) |
82e91ffe | 789 | entry->skb->mark = ntohl(*(__be32 *) |
df6fb868 | 790 | nla_data(nfqa[NFQA_MARK])); |
601e68e1 | 791 | |
7af4cc3f | 792 | issue_verdict(entry, verdict); |
838ab636 | 793 | instance_put(queue); |
7af4cc3f | 794 | return 0; |
838ab636 HW |
795 | |
796 | err_out_put: | |
797 | instance_put(queue); | |
798 | return err; | |
7af4cc3f HW |
799 | } |
800 | ||
801 | static int | |
802 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 803 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
804 | { |
805 | return -ENOTSUPP; | |
806 | } | |
807 | ||
5bf75853 PM |
808 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
809 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
810 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
811 | }; |
812 | ||
e3ac5298 | 813 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
814 | .name = "nf_queue", |
815 | .outfn = &nfqnl_enqueue_packet, | |
816 | }; | |
817 | ||
7af4cc3f HW |
818 | static int |
819 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 820 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
821 | { |
822 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
823 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
824 | struct nfqnl_instance *queue; | |
838ab636 | 825 | int ret = 0; |
7af4cc3f HW |
826 | |
827 | QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); | |
828 | ||
838ab636 | 829 | queue = instance_lookup_get(queue_num); |
df6fb868 | 830 | if (nfqa[NFQA_CFG_CMD]) { |
7af4cc3f | 831 | struct nfqnl_msg_config_cmd *cmd; |
df6fb868 | 832 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); |
7af4cc3f HW |
833 | QDEBUG("found CFG_CMD\n"); |
834 | ||
835 | switch (cmd->command) { | |
836 | case NFQNL_CFG_CMD_BIND: | |
837 | if (queue) | |
838 | return -EBUSY; | |
839 | ||
840 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); | |
841 | if (!queue) | |
842 | return -EINVAL; | |
843 | break; | |
844 | case NFQNL_CFG_CMD_UNBIND: | |
845 | if (!queue) | |
846 | return -ENODEV; | |
847 | ||
838ab636 HW |
848 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
849 | ret = -EPERM; | |
850 | goto out_put; | |
851 | } | |
7af4cc3f HW |
852 | |
853 | instance_destroy(queue); | |
854 | break; | |
855 | case NFQNL_CFG_CMD_PF_BIND: | |
856 | QDEBUG("registering queue handler for pf=%u\n", | |
857 | ntohs(cmd->pf)); | |
bbd86b9f | 858 | ret = nf_register_queue_handler(ntohs(cmd->pf), &nfqh); |
7af4cc3f HW |
859 | break; |
860 | case NFQNL_CFG_CMD_PF_UNBIND: | |
861 | QDEBUG("unregistering queue handler for pf=%u\n", | |
862 | ntohs(cmd->pf)); | |
ce7663d8 | 863 | ret = nf_unregister_queue_handler(ntohs(cmd->pf), &nfqh); |
7af4cc3f HW |
864 | break; |
865 | default: | |
838ab636 HW |
866 | ret = -EINVAL; |
867 | break; | |
7af4cc3f HW |
868 | } |
869 | } else { | |
870 | if (!queue) { | |
871 | QDEBUG("no config command, and no instance ENOENT\n"); | |
838ab636 HW |
872 | ret = -ENOENT; |
873 | goto out_put; | |
7af4cc3f HW |
874 | } |
875 | ||
876 | if (queue->peer_pid != NETLINK_CB(skb).pid) { | |
877 | QDEBUG("no config command, and wrong pid\n"); | |
838ab636 HW |
878 | ret = -EPERM; |
879 | goto out_put; | |
7af4cc3f HW |
880 | } |
881 | } | |
882 | ||
df6fb868 | 883 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 884 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 885 | |
406dbfc9 PM |
886 | if (!queue) { |
887 | ret = -ENOENT; | |
888 | goto out_put; | |
889 | } | |
df6fb868 | 890 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
891 | nfqnl_set_mode(queue, params->copy_mode, |
892 | ntohl(params->copy_range)); | |
893 | } | |
894 | ||
df6fb868 | 895 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 896 | __be32 *queue_maxlen; |
df6fb868 | 897 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
898 | spin_lock_bh(&queue->lock); |
899 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
900 | spin_unlock_bh(&queue->lock); | |
901 | } | |
902 | ||
838ab636 HW |
903 | out_put: |
904 | instance_put(queue); | |
905 | return ret; | |
7af4cc3f HW |
906 | } |
907 | ||
7c8d4cb4 | 908 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
7af4cc3f | 909 | [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp, |
37d2e7a2 | 910 | .attr_count = NFQA_MAX, }, |
7af4cc3f | 911 | [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict, |
5bf75853 PM |
912 | .attr_count = NFQA_MAX, |
913 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 914 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
915 | .attr_count = NFQA_CFG_MAX, |
916 | .policy = nfqa_cfg_policy }, | |
7af4cc3f HW |
917 | }; |
918 | ||
7c8d4cb4 | 919 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
920 | .name = "nf_queue", |
921 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
922 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
923 | .cb = nfqnl_cb, |
924 | }; | |
925 | ||
838ab636 HW |
926 | #ifdef CONFIG_PROC_FS |
927 | struct iter_state { | |
928 | unsigned int bucket; | |
929 | }; | |
930 | ||
931 | static struct hlist_node *get_first(struct seq_file *seq) | |
932 | { | |
933 | struct iter_state *st = seq->private; | |
934 | ||
935 | if (!st) | |
936 | return NULL; | |
937 | ||
938 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
939 | if (!hlist_empty(&instance_table[st->bucket])) | |
940 | return instance_table[st->bucket].first; | |
941 | } | |
942 | return NULL; | |
943 | } | |
944 | ||
945 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
946 | { | |
947 | struct iter_state *st = seq->private; | |
948 | ||
949 | h = h->next; | |
950 | while (!h) { | |
951 | if (++st->bucket >= INSTANCE_BUCKETS) | |
952 | return NULL; | |
953 | ||
954 | h = instance_table[st->bucket].first; | |
955 | } | |
956 | return h; | |
957 | } | |
958 | ||
959 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
960 | { | |
961 | struct hlist_node *head; | |
962 | head = get_first(seq); | |
963 | ||
964 | if (head) | |
965 | while (pos && (head = get_next(seq, head))) | |
966 | pos--; | |
967 | return pos ? NULL : head; | |
968 | } | |
969 | ||
970 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
971 | { | |
972 | read_lock_bh(&instances_lock); | |
973 | return get_idx(seq, *pos); | |
974 | } | |
975 | ||
976 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
977 | { | |
978 | (*pos)++; | |
979 | return get_next(s, v); | |
980 | } | |
981 | ||
982 | static void seq_stop(struct seq_file *s, void *v) | |
983 | { | |
984 | read_unlock_bh(&instances_lock); | |
985 | } | |
986 | ||
987 | static int seq_show(struct seq_file *s, void *v) | |
988 | { | |
989 | const struct nfqnl_instance *inst = v; | |
990 | ||
991 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
992 | inst->queue_num, | |
993 | inst->peer_pid, inst->queue_total, | |
994 | inst->copy_mode, inst->copy_range, | |
995 | inst->queue_dropped, inst->queue_user_dropped, | |
996 | atomic_read(&inst->id_sequence), | |
997 | atomic_read(&inst->use)); | |
998 | } | |
999 | ||
56b3d975 | 1000 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1001 | .start = seq_start, |
1002 | .next = seq_next, | |
1003 | .stop = seq_stop, | |
1004 | .show = seq_show, | |
1005 | }; | |
1006 | ||
1007 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1008 | { | |
e2da5913 PE |
1009 | return seq_open_private(file, &nfqnl_seq_ops, |
1010 | sizeof(struct iter_state)); | |
838ab636 HW |
1011 | } |
1012 | ||
da7071d7 | 1013 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1014 | .owner = THIS_MODULE, |
1015 | .open = nfqnl_open, | |
1016 | .read = seq_read, | |
1017 | .llseek = seq_lseek, | |
1018 | .release = seq_release_private, | |
1019 | }; | |
1020 | ||
1021 | #endif /* PROC_FS */ | |
1022 | ||
32292a7f | 1023 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 1024 | { |
838ab636 HW |
1025 | int i, status = -ENOMEM; |
1026 | #ifdef CONFIG_PROC_FS | |
1027 | struct proc_dir_entry *proc_nfqueue; | |
1028 | #endif | |
601e68e1 | 1029 | |
838ab636 HW |
1030 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1031 | INIT_HLIST_HEAD(&instance_table[i]); | |
1032 | ||
7af4cc3f HW |
1033 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1034 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1035 | if (status < 0) { | |
1036 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
1037 | goto cleanup_netlink_notifier; | |
1038 | } | |
1039 | ||
838ab636 HW |
1040 | #ifdef CONFIG_PROC_FS |
1041 | proc_nfqueue = create_proc_entry("nfnetlink_queue", 0440, | |
1042 | proc_net_netfilter); | |
1043 | if (!proc_nfqueue) | |
1044 | goto cleanup_subsys; | |
1045 | proc_nfqueue->proc_fops = &nfqnl_file_ops; | |
1046 | #endif | |
1047 | ||
7af4cc3f HW |
1048 | register_netdevice_notifier(&nfqnl_dev_notifier); |
1049 | return status; | |
1050 | ||
838ab636 HW |
1051 | #ifdef CONFIG_PROC_FS |
1052 | cleanup_subsys: | |
7af4cc3f | 1053 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 1054 | #endif |
7af4cc3f HW |
1055 | cleanup_netlink_notifier: |
1056 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1057 | return status; | |
1058 | } | |
1059 | ||
65b4b4e8 | 1060 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1061 | { |
32292a7f PM |
1062 | nf_unregister_queue_handlers(&nfqh); |
1063 | unregister_netdevice_notifier(&nfqnl_dev_notifier); | |
1064 | #ifdef CONFIG_PROC_FS | |
1065 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
1066 | #endif | |
1067 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
1068 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
7af4cc3f HW |
1069 | } |
1070 | ||
1071 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1072 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1073 | MODULE_LICENSE("GPL"); | |
1074 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1075 | ||
65b4b4e8 AM |
1076 | module_init(nfnetlink_queue_init); |
1077 | module_exit(nfnetlink_queue_fini); |