Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This is a module which is used for queueing IPv6 packets and | |
3 | * communicating with userspace via netlink. | |
4 | * | |
5 | * (C) 2001 Fernando Anton, this code is GPL. | |
6 | * IPv64 Project - Work based in IPv64 draft by Arturo Azcorra. | |
7 | * Universidad Carlos III de Madrid - Leganes (Madrid) - Spain | |
8 | * Universidad Politecnica de Alcala de Henares - Alcala de H. (Madrid) - Spain | |
9 | * email: fanton@it.uc3m.es | |
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 | * 2001-11-06: First try. Working with ip_queue.c for IPv4 and trying | |
16 | * to adapt it to IPv6 | |
17 | * HEAVILY based in ipqueue.c by James Morris. It's just | |
18 | * a little modified version of it, so he's nearly the | |
19 | * real coder of this. | |
20 | * Few changes needed, mainly the hard_routing code and | |
21 | * the netlink socket protocol (we're NETLINK_IP6_FW). | |
22 | * 2002-06-25: Code cleanup. [JM: ported cleanup over from ip_queue.c] | |
23 | * 2005-02-04: Added /proc counter for dropped packets; fixed so | |
24 | * packets aren't delivered to user space if they're going | |
25 | * to be dropped. | |
26 | */ | |
27 | #include <linux/module.h> | |
28 | #include <linux/skbuff.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/ipv6.h> | |
31 | #include <linux/notifier.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/netfilter.h> | |
34 | #include <linux/netlink.h> | |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/sysctl.h> | |
37 | #include <linux/proc_fs.h> | |
38 | #include <net/sock.h> | |
39 | #include <net/ipv6.h> | |
40 | #include <net/ip6_route.h> | |
41 | #include <linux/netfilter_ipv4/ip_queue.h> | |
42 | #include <linux/netfilter_ipv4/ip_tables.h> | |
43 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
44 | ||
45 | #define IPQ_QMAX_DEFAULT 1024 | |
46 | #define IPQ_PROC_FS_NAME "ip6_queue" | |
47 | #define NET_IPQ_QMAX 2088 | |
48 | #define NET_IPQ_QMAX_NAME "ip6_queue_maxlen" | |
49 | ||
1da177e4 LT |
50 | struct ipq_queue_entry { |
51 | struct list_head list; | |
52 | struct nf_info *info; | |
53 | struct sk_buff *skb; | |
1da177e4 LT |
54 | }; |
55 | ||
56 | typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long); | |
57 | ||
58 | static unsigned char copy_mode = IPQ_COPY_NONE; | |
59 | static unsigned int queue_maxlen = IPQ_QMAX_DEFAULT; | |
60 | static DEFINE_RWLOCK(queue_lock); | |
61 | static int peer_pid; | |
62 | static unsigned int copy_range; | |
63 | static unsigned int queue_total; | |
64 | static unsigned int queue_dropped = 0; | |
65 | static unsigned int queue_user_dropped = 0; | |
66 | static struct sock *ipqnl; | |
67 | static LIST_HEAD(queue_list); | |
68 | static DECLARE_MUTEX(ipqnl_sem); | |
69 | ||
70 | static void | |
71 | ipq_issue_verdict(struct ipq_queue_entry *entry, int verdict) | |
72 | { | |
4c1217de | 73 | local_bh_disable(); |
1da177e4 | 74 | nf_reinject(entry->skb, entry->info, verdict); |
4c1217de | 75 | local_bh_enable(); |
1da177e4 LT |
76 | kfree(entry); |
77 | } | |
78 | ||
79 | static inline void | |
80 | __ipq_enqueue_entry(struct ipq_queue_entry *entry) | |
81 | { | |
82 | list_add(&entry->list, &queue_list); | |
83 | queue_total++; | |
84 | } | |
85 | ||
86 | /* | |
87 | * Find and return a queued entry matched by cmpfn, or return the last | |
88 | * entry if cmpfn is NULL. | |
89 | */ | |
90 | static inline struct ipq_queue_entry * | |
91 | __ipq_find_entry(ipq_cmpfn cmpfn, unsigned long data) | |
92 | { | |
93 | struct list_head *p; | |
94 | ||
95 | list_for_each_prev(p, &queue_list) { | |
96 | struct ipq_queue_entry *entry = (struct ipq_queue_entry *)p; | |
97 | ||
98 | if (!cmpfn || cmpfn(entry, data)) | |
99 | return entry; | |
100 | } | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | static inline void | |
105 | __ipq_dequeue_entry(struct ipq_queue_entry *entry) | |
106 | { | |
107 | list_del(&entry->list); | |
108 | queue_total--; | |
109 | } | |
110 | ||
111 | static inline struct ipq_queue_entry * | |
112 | __ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data) | |
113 | { | |
114 | struct ipq_queue_entry *entry; | |
115 | ||
116 | entry = __ipq_find_entry(cmpfn, data); | |
117 | if (entry == NULL) | |
118 | return NULL; | |
119 | ||
120 | __ipq_dequeue_entry(entry); | |
121 | return entry; | |
122 | } | |
123 | ||
124 | ||
125 | static inline void | |
126 | __ipq_flush(int verdict) | |
127 | { | |
128 | struct ipq_queue_entry *entry; | |
129 | ||
130 | while ((entry = __ipq_find_dequeue_entry(NULL, 0))) | |
131 | ipq_issue_verdict(entry, verdict); | |
132 | } | |
133 | ||
134 | static inline int | |
135 | __ipq_set_mode(unsigned char mode, unsigned int range) | |
136 | { | |
137 | int status = 0; | |
138 | ||
139 | switch(mode) { | |
140 | case IPQ_COPY_NONE: | |
141 | case IPQ_COPY_META: | |
142 | copy_mode = mode; | |
143 | copy_range = 0; | |
144 | break; | |
145 | ||
146 | case IPQ_COPY_PACKET: | |
147 | copy_mode = mode; | |
148 | copy_range = range; | |
149 | if (copy_range > 0xFFFF) | |
150 | copy_range = 0xFFFF; | |
151 | break; | |
152 | ||
153 | default: | |
154 | status = -EINVAL; | |
155 | ||
156 | } | |
157 | return status; | |
158 | } | |
159 | ||
160 | static inline void | |
161 | __ipq_reset(void) | |
162 | { | |
163 | peer_pid = 0; | |
164 | net_disable_timestamp(); | |
165 | __ipq_set_mode(IPQ_COPY_NONE, 0); | |
166 | __ipq_flush(NF_DROP); | |
167 | } | |
168 | ||
169 | static struct ipq_queue_entry * | |
170 | ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data) | |
171 | { | |
172 | struct ipq_queue_entry *entry; | |
173 | ||
174 | write_lock_bh(&queue_lock); | |
175 | entry = __ipq_find_dequeue_entry(cmpfn, data); | |
176 | write_unlock_bh(&queue_lock); | |
177 | return entry; | |
178 | } | |
179 | ||
180 | static void | |
181 | ipq_flush(int verdict) | |
182 | { | |
183 | write_lock_bh(&queue_lock); | |
184 | __ipq_flush(verdict); | |
185 | write_unlock_bh(&queue_lock); | |
186 | } | |
187 | ||
188 | static struct sk_buff * | |
189 | ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp) | |
190 | { | |
191 | unsigned char *old_tail; | |
192 | size_t size = 0; | |
193 | size_t data_len = 0; | |
194 | struct sk_buff *skb; | |
195 | struct ipq_packet_msg *pmsg; | |
196 | struct nlmsghdr *nlh; | |
197 | ||
198 | read_lock_bh(&queue_lock); | |
199 | ||
200 | switch (copy_mode) { | |
201 | case IPQ_COPY_META: | |
202 | case IPQ_COPY_NONE: | |
203 | size = NLMSG_SPACE(sizeof(*pmsg)); | |
204 | data_len = 0; | |
205 | break; | |
206 | ||
207 | case IPQ_COPY_PACKET: | |
66a79a19 PM |
208 | if (entry->skb->ip_summed == CHECKSUM_HW && |
209 | (*errp = skb_checksum_help(entry->skb, | |
210 | entry->info->outdev == NULL))) { | |
211 | read_unlock_bh(&queue_lock); | |
212 | return NULL; | |
213 | } | |
1da177e4 LT |
214 | if (copy_range == 0 || copy_range > entry->skb->len) |
215 | data_len = entry->skb->len; | |
216 | else | |
217 | data_len = copy_range; | |
218 | ||
219 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); | |
220 | break; | |
221 | ||
222 | default: | |
223 | *errp = -EINVAL; | |
224 | read_unlock_bh(&queue_lock); | |
225 | return NULL; | |
226 | } | |
227 | ||
228 | read_unlock_bh(&queue_lock); | |
229 | ||
230 | skb = alloc_skb(size, GFP_ATOMIC); | |
231 | if (!skb) | |
232 | goto nlmsg_failure; | |
233 | ||
234 | old_tail= skb->tail; | |
235 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); | |
236 | pmsg = NLMSG_DATA(nlh); | |
237 | memset(pmsg, 0, sizeof(*pmsg)); | |
238 | ||
239 | pmsg->packet_id = (unsigned long )entry; | |
240 | pmsg->data_len = data_len; | |
a61bbcf2 PM |
241 | pmsg->timestamp_sec = skb_tv_base.tv_sec + entry->skb->tstamp.off_sec; |
242 | pmsg->timestamp_usec = skb_tv_base.tv_usec + entry->skb->tstamp.off_usec; | |
1da177e4 LT |
243 | pmsg->mark = entry->skb->nfmark; |
244 | pmsg->hook = entry->info->hook; | |
245 | pmsg->hw_protocol = entry->skb->protocol; | |
246 | ||
247 | if (entry->info->indev) | |
248 | strcpy(pmsg->indev_name, entry->info->indev->name); | |
249 | else | |
250 | pmsg->indev_name[0] = '\0'; | |
251 | ||
252 | if (entry->info->outdev) | |
253 | strcpy(pmsg->outdev_name, entry->info->outdev->name); | |
254 | else | |
255 | pmsg->outdev_name[0] = '\0'; | |
256 | ||
257 | if (entry->info->indev && entry->skb->dev) { | |
258 | pmsg->hw_type = entry->skb->dev->type; | |
259 | if (entry->skb->dev->hard_header_parse) | |
260 | pmsg->hw_addrlen = | |
261 | entry->skb->dev->hard_header_parse(entry->skb, | |
262 | pmsg->hw_addr); | |
263 | } | |
264 | ||
265 | if (data_len) | |
266 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) | |
267 | BUG(); | |
268 | ||
269 | nlh->nlmsg_len = skb->tail - old_tail; | |
270 | return skb; | |
271 | ||
272 | nlmsg_failure: | |
273 | if (skb) | |
274 | kfree_skb(skb); | |
275 | *errp = -EINVAL; | |
276 | printk(KERN_ERR "ip6_queue: error creating packet message\n"); | |
277 | return NULL; | |
278 | } | |
279 | ||
280 | static int | |
0ab43f84 HW |
281 | ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
282 | unsigned int queuenum, void *data) | |
1da177e4 LT |
283 | { |
284 | int status = -EINVAL; | |
285 | struct sk_buff *nskb; | |
286 | struct ipq_queue_entry *entry; | |
287 | ||
288 | if (copy_mode == IPQ_COPY_NONE) | |
289 | return -EAGAIN; | |
290 | ||
291 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
292 | if (entry == NULL) { | |
293 | printk(KERN_ERR "ip6_queue: OOM in ipq_enqueue_packet()\n"); | |
294 | return -ENOMEM; | |
295 | } | |
296 | ||
297 | entry->info = info; | |
298 | entry->skb = skb; | |
299 | ||
1da177e4 LT |
300 | nskb = ipq_build_packet_message(entry, &status); |
301 | if (nskb == NULL) | |
302 | goto err_out_free; | |
303 | ||
304 | write_lock_bh(&queue_lock); | |
305 | ||
306 | if (!peer_pid) | |
307 | goto err_out_free_nskb; | |
308 | ||
309 | if (queue_total >= queue_maxlen) { | |
310 | queue_dropped++; | |
311 | status = -ENOSPC; | |
312 | if (net_ratelimit()) | |
313 | printk (KERN_WARNING "ip6_queue: fill at %d entries, " | |
314 | "dropping packet(s). Dropped: %d\n", queue_total, | |
315 | queue_dropped); | |
316 | goto err_out_free_nskb; | |
317 | } | |
318 | ||
319 | /* netlink_unicast will either free the nskb or attach it to a socket */ | |
320 | status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT); | |
321 | if (status < 0) { | |
322 | queue_user_dropped++; | |
323 | goto err_out_unlock; | |
324 | } | |
325 | ||
326 | __ipq_enqueue_entry(entry); | |
327 | ||
328 | write_unlock_bh(&queue_lock); | |
329 | return status; | |
330 | ||
331 | err_out_free_nskb: | |
332 | kfree_skb(nskb); | |
333 | ||
334 | err_out_unlock: | |
335 | write_unlock_bh(&queue_lock); | |
336 | ||
337 | err_out_free: | |
338 | kfree(entry); | |
339 | return status; | |
340 | } | |
341 | ||
342 | static int | |
343 | ipq_mangle_ipv6(ipq_verdict_msg_t *v, struct ipq_queue_entry *e) | |
344 | { | |
345 | int diff; | |
346 | struct ipv6hdr *user_iph = (struct ipv6hdr *)v->payload; | |
347 | ||
348 | if (v->data_len < sizeof(*user_iph)) | |
349 | return 0; | |
350 | diff = v->data_len - e->skb->len; | |
351 | if (diff < 0) | |
352 | skb_trim(e->skb, v->data_len); | |
353 | else if (diff > 0) { | |
354 | if (v->data_len > 0xFFFF) | |
355 | return -EINVAL; | |
356 | if (diff > skb_tailroom(e->skb)) { | |
357 | struct sk_buff *newskb; | |
358 | ||
359 | newskb = skb_copy_expand(e->skb, | |
360 | skb_headroom(e->skb), | |
361 | diff, | |
362 | GFP_ATOMIC); | |
363 | if (newskb == NULL) { | |
364 | printk(KERN_WARNING "ip6_queue: OOM " | |
365 | "in mangle, dropping packet\n"); | |
366 | return -ENOMEM; | |
367 | } | |
368 | if (e->skb->sk) | |
369 | skb_set_owner_w(newskb, e->skb->sk); | |
370 | kfree_skb(e->skb); | |
371 | e->skb = newskb; | |
372 | } | |
373 | skb_put(e->skb, diff); | |
374 | } | |
089af26c | 375 | if (!skb_make_writable(&e->skb, v->data_len)) |
1da177e4 LT |
376 | return -ENOMEM; |
377 | memcpy(e->skb->data, v->payload, v->data_len); | |
66a79a19 | 378 | e->skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 379 | |
1da177e4 LT |
380 | return 0; |
381 | } | |
382 | ||
383 | static inline int | |
384 | id_cmp(struct ipq_queue_entry *e, unsigned long id) | |
385 | { | |
386 | return (id == (unsigned long )e); | |
387 | } | |
388 | ||
389 | static int | |
390 | ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len) | |
391 | { | |
392 | struct ipq_queue_entry *entry; | |
393 | ||
394 | if (vmsg->value > NF_MAX_VERDICT) | |
395 | return -EINVAL; | |
396 | ||
397 | entry = ipq_find_dequeue_entry(id_cmp, vmsg->id); | |
398 | if (entry == NULL) | |
399 | return -ENOENT; | |
400 | else { | |
401 | int verdict = vmsg->value; | |
402 | ||
403 | if (vmsg->data_len && vmsg->data_len == len) | |
404 | if (ipq_mangle_ipv6(vmsg, entry) < 0) | |
405 | verdict = NF_DROP; | |
406 | ||
407 | ipq_issue_verdict(entry, verdict); | |
408 | return 0; | |
409 | } | |
410 | } | |
411 | ||
412 | static int | |
413 | ipq_set_mode(unsigned char mode, unsigned int range) | |
414 | { | |
415 | int status; | |
416 | ||
417 | write_lock_bh(&queue_lock); | |
418 | status = __ipq_set_mode(mode, range); | |
419 | write_unlock_bh(&queue_lock); | |
420 | return status; | |
421 | } | |
422 | ||
423 | static int | |
424 | ipq_receive_peer(struct ipq_peer_msg *pmsg, | |
425 | unsigned char type, unsigned int len) | |
426 | { | |
427 | int status = 0; | |
428 | ||
429 | if (len < sizeof(*pmsg)) | |
430 | return -EINVAL; | |
431 | ||
432 | switch (type) { | |
433 | case IPQM_MODE: | |
434 | status = ipq_set_mode(pmsg->msg.mode.value, | |
435 | pmsg->msg.mode.range); | |
436 | break; | |
437 | ||
438 | case IPQM_VERDICT: | |
439 | if (pmsg->msg.verdict.value > NF_MAX_VERDICT) | |
440 | status = -EINVAL; | |
441 | else | |
442 | status = ipq_set_verdict(&pmsg->msg.verdict, | |
443 | len - sizeof(*pmsg)); | |
444 | break; | |
445 | default: | |
446 | status = -EINVAL; | |
447 | } | |
448 | return status; | |
449 | } | |
450 | ||
451 | static int | |
452 | dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex) | |
453 | { | |
454 | if (entry->info->indev) | |
455 | if (entry->info->indev->ifindex == ifindex) | |
456 | return 1; | |
457 | ||
458 | if (entry->info->outdev) | |
459 | if (entry->info->outdev->ifindex == ifindex) | |
460 | return 1; | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | static void | |
466 | ipq_dev_drop(int ifindex) | |
467 | { | |
468 | struct ipq_queue_entry *entry; | |
469 | ||
470 | while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL) | |
471 | ipq_issue_verdict(entry, NF_DROP); | |
472 | } | |
473 | ||
474 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
475 | ||
476 | static inline void | |
477 | ipq_rcv_skb(struct sk_buff *skb) | |
478 | { | |
479 | int status, type, pid, flags, nlmsglen, skblen; | |
480 | struct nlmsghdr *nlh; | |
481 | ||
482 | skblen = skb->len; | |
483 | if (skblen < sizeof(*nlh)) | |
484 | return; | |
485 | ||
486 | nlh = (struct nlmsghdr *)skb->data; | |
487 | nlmsglen = nlh->nlmsg_len; | |
488 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) | |
489 | return; | |
490 | ||
491 | pid = nlh->nlmsg_pid; | |
492 | flags = nlh->nlmsg_flags; | |
493 | ||
494 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) | |
495 | RCV_SKB_FAIL(-EINVAL); | |
496 | ||
497 | if (flags & MSG_TRUNC) | |
498 | RCV_SKB_FAIL(-ECOMM); | |
499 | ||
500 | type = nlh->nlmsg_type; | |
501 | if (type < NLMSG_NOOP || type >= IPQM_MAX) | |
502 | RCV_SKB_FAIL(-EINVAL); | |
503 | ||
504 | if (type <= IPQM_BASE) | |
505 | return; | |
506 | ||
507 | if (security_netlink_recv(skb)) | |
508 | RCV_SKB_FAIL(-EPERM); | |
509 | ||
510 | write_lock_bh(&queue_lock); | |
511 | ||
512 | if (peer_pid) { | |
513 | if (peer_pid != pid) { | |
514 | write_unlock_bh(&queue_lock); | |
515 | RCV_SKB_FAIL(-EBUSY); | |
516 | } | |
517 | } else { | |
518 | net_enable_timestamp(); | |
519 | peer_pid = pid; | |
520 | } | |
521 | ||
522 | write_unlock_bh(&queue_lock); | |
523 | ||
524 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, | |
525 | skblen - NLMSG_LENGTH(0)); | |
526 | if (status < 0) | |
527 | RCV_SKB_FAIL(status); | |
528 | ||
529 | if (flags & NLM_F_ACK) | |
530 | netlink_ack(skb, nlh, 0); | |
531 | return; | |
532 | } | |
533 | ||
534 | static void | |
535 | ipq_rcv_sk(struct sock *sk, int len) | |
536 | { | |
2a0a6ebe HX |
537 | struct sk_buff *skb; |
538 | unsigned int qlen; | |
1da177e4 | 539 | |
2a0a6ebe | 540 | down(&ipqnl_sem); |
1da177e4 | 541 | |
2a0a6ebe HX |
542 | for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) { |
543 | skb = skb_dequeue(&sk->sk_receive_queue); | |
544 | ipq_rcv_skb(skb); | |
545 | kfree_skb(skb); | |
546 | } | |
1da177e4 | 547 | |
2a0a6ebe | 548 | up(&ipqnl_sem); |
1da177e4 LT |
549 | } |
550 | ||
551 | static int | |
552 | ipq_rcv_dev_event(struct notifier_block *this, | |
553 | unsigned long event, void *ptr) | |
554 | { | |
555 | struct net_device *dev = ptr; | |
556 | ||
557 | /* Drop any packets associated with the downed device */ | |
558 | if (event == NETDEV_DOWN) | |
559 | ipq_dev_drop(dev->ifindex); | |
560 | return NOTIFY_DONE; | |
561 | } | |
562 | ||
563 | static struct notifier_block ipq_dev_notifier = { | |
564 | .notifier_call = ipq_rcv_dev_event, | |
565 | }; | |
566 | ||
567 | static int | |
568 | ipq_rcv_nl_event(struct notifier_block *this, | |
569 | unsigned long event, void *ptr) | |
570 | { | |
571 | struct netlink_notify *n = ptr; | |
572 | ||
573 | if (event == NETLINK_URELEASE && | |
574 | n->protocol == NETLINK_IP6_FW && n->pid) { | |
575 | write_lock_bh(&queue_lock); | |
576 | if (n->pid == peer_pid) | |
577 | __ipq_reset(); | |
578 | write_unlock_bh(&queue_lock); | |
579 | } | |
580 | return NOTIFY_DONE; | |
581 | } | |
582 | ||
583 | static struct notifier_block ipq_nl_notifier = { | |
584 | .notifier_call = ipq_rcv_nl_event, | |
585 | }; | |
586 | ||
587 | static struct ctl_table_header *ipq_sysctl_header; | |
588 | ||
589 | static ctl_table ipq_table[] = { | |
590 | { | |
591 | .ctl_name = NET_IPQ_QMAX, | |
592 | .procname = NET_IPQ_QMAX_NAME, | |
593 | .data = &queue_maxlen, | |
594 | .maxlen = sizeof(queue_maxlen), | |
595 | .mode = 0644, | |
596 | .proc_handler = proc_dointvec | |
597 | }, | |
598 | { .ctl_name = 0 } | |
599 | }; | |
600 | ||
601 | static ctl_table ipq_dir_table[] = { | |
602 | { | |
603 | .ctl_name = NET_IPV6, | |
604 | .procname = "ipv6", | |
605 | .mode = 0555, | |
606 | .child = ipq_table | |
607 | }, | |
608 | { .ctl_name = 0 } | |
609 | }; | |
610 | ||
611 | static ctl_table ipq_root_table[] = { | |
612 | { | |
613 | .ctl_name = CTL_NET, | |
614 | .procname = "net", | |
615 | .mode = 0555, | |
616 | .child = ipq_dir_table | |
617 | }, | |
618 | { .ctl_name = 0 } | |
619 | }; | |
620 | ||
621 | static int | |
622 | ipq_get_info(char *buffer, char **start, off_t offset, int length) | |
623 | { | |
624 | int len; | |
625 | ||
626 | read_lock_bh(&queue_lock); | |
627 | ||
628 | len = sprintf(buffer, | |
629 | "Peer PID : %d\n" | |
630 | "Copy mode : %hu\n" | |
631 | "Copy range : %u\n" | |
632 | "Queue length : %u\n" | |
633 | "Queue max. length : %u\n" | |
634 | "Queue dropped : %u\n" | |
635 | "Netfilter dropped : %u\n", | |
636 | peer_pid, | |
637 | copy_mode, | |
638 | copy_range, | |
639 | queue_total, | |
640 | queue_maxlen, | |
641 | queue_dropped, | |
642 | queue_user_dropped); | |
643 | ||
644 | read_unlock_bh(&queue_lock); | |
645 | ||
646 | *start = buffer + offset; | |
647 | len -= offset; | |
648 | if (len > length) | |
649 | len = length; | |
650 | else if (len < 0) | |
651 | len = 0; | |
652 | return len; | |
653 | } | |
654 | ||
bbd86b9f HW |
655 | static struct nf_queue_handler nfqh = { |
656 | .name = "ip6_queue", | |
657 | .outfn = &ipq_enqueue_packet, | |
658 | }; | |
659 | ||
1da177e4 LT |
660 | static int |
661 | init_or_cleanup(int init) | |
662 | { | |
663 | int status = -ENOMEM; | |
664 | struct proc_dir_entry *proc; | |
665 | ||
666 | if (!init) | |
667 | goto cleanup; | |
668 | ||
669 | netlink_register_notifier(&ipq_nl_notifier); | |
06628607 PM |
670 | ipqnl = netlink_kernel_create(NETLINK_IP6_FW, 0, ipq_rcv_sk, |
671 | THIS_MODULE); | |
1da177e4 LT |
672 | if (ipqnl == NULL) { |
673 | printk(KERN_ERR "ip6_queue: failed to create netlink socket\n"); | |
674 | goto cleanup_netlink_notifier; | |
675 | } | |
676 | ||
677 | proc = proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info); | |
678 | if (proc) | |
679 | proc->owner = THIS_MODULE; | |
680 | else { | |
681 | printk(KERN_ERR "ip6_queue: failed to create proc entry\n"); | |
682 | goto cleanup_ipqnl; | |
683 | } | |
684 | ||
685 | register_netdevice_notifier(&ipq_dev_notifier); | |
686 | ipq_sysctl_header = register_sysctl_table(ipq_root_table, 0); | |
687 | ||
bbd86b9f | 688 | status = nf_register_queue_handler(PF_INET6, &nfqh); |
1da177e4 LT |
689 | if (status < 0) { |
690 | printk(KERN_ERR "ip6_queue: failed to register queue handler\n"); | |
691 | goto cleanup_sysctl; | |
692 | } | |
693 | return status; | |
694 | ||
695 | cleanup: | |
bbd86b9f | 696 | nf_unregister_queue_handlers(&nfqh); |
1da177e4 LT |
697 | synchronize_net(); |
698 | ipq_flush(NF_DROP); | |
699 | ||
700 | cleanup_sysctl: | |
701 | unregister_sysctl_table(ipq_sysctl_header); | |
702 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
703 | proc_net_remove(IPQ_PROC_FS_NAME); | |
704 | ||
705 | cleanup_ipqnl: | |
706 | sock_release(ipqnl->sk_socket); | |
707 | down(&ipqnl_sem); | |
708 | up(&ipqnl_sem); | |
709 | ||
710 | cleanup_netlink_notifier: | |
711 | netlink_unregister_notifier(&ipq_nl_notifier); | |
712 | return status; | |
713 | } | |
714 | ||
715 | static int __init init(void) | |
716 | { | |
717 | ||
718 | return init_or_cleanup(1); | |
719 | } | |
720 | ||
721 | static void __exit fini(void) | |
722 | { | |
723 | init_or_cleanup(0); | |
724 | } | |
725 | ||
726 | MODULE_DESCRIPTION("IPv6 packet queue handler"); | |
727 | MODULE_LICENSE("GPL"); | |
728 | ||
729 | module_init(init); | |
730 | module_exit(fini); |