Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * This is a module which is used for queueing IPv4 packets and | |
3 | * communicating with userspace via netlink. | |
4 | * | |
5 | * (C) 2000-2002 James Morris <jmorris@intercode.com.au> | |
9bb7bc94 | 6 | * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> |
1da177e4 LT |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * 2000-03-27: Simplified code (thanks to Andi Kleen for clues). | |
13 | * 2000-05-20: Fixed notifier problems (following Miguel Freitas' report). | |
14 | * 2000-06-19: Fixed so nfmark is copied to metadata (reported by Sebastian | |
15 | * Zander). | |
16 | * 2000-08-01: Added Nick Williams' MAC support. | |
17 | * 2002-06-25: Code cleanup. | |
18 | * 2005-01-10: Added /proc counter for dropped packets; fixed so | |
19 | * packets aren't delivered to user space if they're going | |
20 | * to be dropped. | |
9bb7bc94 | 21 | * 2005-05-26: local_bh_{disable,enable} around nf_reinject (Harald Welte) |
1da177e4 LT |
22 | * |
23 | */ | |
24 | #include <linux/module.h> | |
25 | #include <linux/skbuff.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/ip.h> | |
28 | #include <linux/notifier.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/netfilter.h> | |
31 | #include <linux/netfilter_ipv4/ip_queue.h> | |
32 | #include <linux/netfilter_ipv4/ip_tables.h> | |
33 | #include <linux/netlink.h> | |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/sysctl.h> | |
36 | #include <linux/proc_fs.h> | |
37 | #include <linux/security.h> | |
4a3e2f71 | 38 | #include <linux/mutex.h> |
1da177e4 LT |
39 | #include <net/sock.h> |
40 | #include <net/route.h> | |
41 | ||
42 | #define IPQ_QMAX_DEFAULT 1024 | |
43 | #define IPQ_PROC_FS_NAME "ip_queue" | |
44 | #define NET_IPQ_QMAX 2088 | |
45 | #define NET_IPQ_QMAX_NAME "ip_queue_maxlen" | |
46 | ||
1da177e4 LT |
47 | struct ipq_queue_entry { |
48 | struct list_head list; | |
49 | struct nf_info *info; | |
50 | struct sk_buff *skb; | |
1da177e4 LT |
51 | }; |
52 | ||
53 | typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long); | |
54 | ||
55 | static unsigned char copy_mode = IPQ_COPY_NONE; | |
56 | static unsigned int queue_maxlen = IPQ_QMAX_DEFAULT; | |
57 | static DEFINE_RWLOCK(queue_lock); | |
58 | static int peer_pid; | |
59 | static unsigned int copy_range; | |
60 | static unsigned int queue_total; | |
61 | static unsigned int queue_dropped = 0; | |
62 | static unsigned int queue_user_dropped = 0; | |
63 | static struct sock *ipqnl; | |
64 | static LIST_HEAD(queue_list); | |
4a3e2f71 | 65 | static DEFINE_MUTEX(ipqnl_mutex); |
1da177e4 LT |
66 | |
67 | static void | |
68 | ipq_issue_verdict(struct ipq_queue_entry *entry, int verdict) | |
69 | { | |
9bb7bc94 HW |
70 | /* TCP input path (and probably other bits) assume to be called |
71 | * from softirq context, not from syscall, like ipq_issue_verdict is | |
72 | * called. TCP input path deadlocks with locks taken from timer | |
73 | * softirq, e.g. We therefore emulate this by local_bh_disable() */ | |
74 | ||
75 | local_bh_disable(); | |
1da177e4 | 76 | nf_reinject(entry->skb, entry->info, verdict); |
9bb7bc94 HW |
77 | local_bh_enable(); |
78 | ||
1da177e4 LT |
79 | kfree(entry); |
80 | } | |
81 | ||
82 | static inline void | |
83 | __ipq_enqueue_entry(struct ipq_queue_entry *entry) | |
84 | { | |
85 | list_add(&entry->list, &queue_list); | |
86 | queue_total++; | |
87 | } | |
88 | ||
89 | /* | |
90 | * Find and return a queued entry matched by cmpfn, or return the last | |
91 | * entry if cmpfn is NULL. | |
92 | */ | |
93 | static inline struct ipq_queue_entry * | |
94 | __ipq_find_entry(ipq_cmpfn cmpfn, unsigned long data) | |
95 | { | |
96 | struct list_head *p; | |
97 | ||
98 | list_for_each_prev(p, &queue_list) { | |
99 | struct ipq_queue_entry *entry = (struct ipq_queue_entry *)p; | |
100 | ||
101 | if (!cmpfn || cmpfn(entry, data)) | |
102 | return entry; | |
103 | } | |
104 | return NULL; | |
105 | } | |
106 | ||
107 | static inline void | |
108 | __ipq_dequeue_entry(struct ipq_queue_entry *entry) | |
109 | { | |
110 | list_del(&entry->list); | |
111 | queue_total--; | |
112 | } | |
113 | ||
114 | static inline struct ipq_queue_entry * | |
115 | __ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data) | |
116 | { | |
117 | struct ipq_queue_entry *entry; | |
118 | ||
119 | entry = __ipq_find_entry(cmpfn, data); | |
120 | if (entry == NULL) | |
121 | return NULL; | |
122 | ||
123 | __ipq_dequeue_entry(entry); | |
124 | return entry; | |
125 | } | |
126 | ||
127 | ||
128 | static inline void | |
129 | __ipq_flush(int verdict) | |
130 | { | |
131 | struct ipq_queue_entry *entry; | |
132 | ||
133 | while ((entry = __ipq_find_dequeue_entry(NULL, 0))) | |
134 | ipq_issue_verdict(entry, verdict); | |
135 | } | |
136 | ||
137 | static inline int | |
138 | __ipq_set_mode(unsigned char mode, unsigned int range) | |
139 | { | |
140 | int status = 0; | |
141 | ||
142 | switch(mode) { | |
143 | case IPQ_COPY_NONE: | |
144 | case IPQ_COPY_META: | |
145 | copy_mode = mode; | |
146 | copy_range = 0; | |
147 | break; | |
148 | ||
149 | case IPQ_COPY_PACKET: | |
150 | copy_mode = mode; | |
151 | copy_range = range; | |
152 | if (copy_range > 0xFFFF) | |
153 | copy_range = 0xFFFF; | |
154 | break; | |
155 | ||
156 | default: | |
157 | status = -EINVAL; | |
158 | ||
159 | } | |
160 | return status; | |
161 | } | |
162 | ||
163 | static inline void | |
164 | __ipq_reset(void) | |
165 | { | |
166 | peer_pid = 0; | |
167 | net_disable_timestamp(); | |
168 | __ipq_set_mode(IPQ_COPY_NONE, 0); | |
169 | __ipq_flush(NF_DROP); | |
170 | } | |
171 | ||
172 | static struct ipq_queue_entry * | |
173 | ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data) | |
174 | { | |
175 | struct ipq_queue_entry *entry; | |
176 | ||
177 | write_lock_bh(&queue_lock); | |
178 | entry = __ipq_find_dequeue_entry(cmpfn, data); | |
179 | write_unlock_bh(&queue_lock); | |
180 | return entry; | |
181 | } | |
182 | ||
183 | static void | |
184 | ipq_flush(int verdict) | |
185 | { | |
186 | write_lock_bh(&queue_lock); | |
187 | __ipq_flush(verdict); | |
188 | write_unlock_bh(&queue_lock); | |
189 | } | |
190 | ||
191 | static struct sk_buff * | |
192 | ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp) | |
193 | { | |
194 | unsigned char *old_tail; | |
195 | size_t size = 0; | |
196 | size_t data_len = 0; | |
197 | struct sk_buff *skb; | |
198 | struct ipq_packet_msg *pmsg; | |
199 | struct nlmsghdr *nlh; | |
200 | ||
201 | read_lock_bh(&queue_lock); | |
202 | ||
203 | switch (copy_mode) { | |
204 | case IPQ_COPY_META: | |
205 | case IPQ_COPY_NONE: | |
206 | size = NLMSG_SPACE(sizeof(*pmsg)); | |
207 | data_len = 0; | |
208 | break; | |
209 | ||
210 | case IPQ_COPY_PACKET: | |
84fa7933 PM |
211 | if ((entry->skb->ip_summed == CHECKSUM_PARTIAL || |
212 | entry->skb->ip_summed == CHECKSUM_COMPLETE) && | |
213 | (*errp = skb_checksum_help(entry->skb))) { | |
66a79a19 PM |
214 | read_unlock_bh(&queue_lock); |
215 | return NULL; | |
216 | } | |
1da177e4 LT |
217 | if (copy_range == 0 || copy_range > entry->skb->len) |
218 | data_len = entry->skb->len; | |
219 | else | |
220 | data_len = copy_range; | |
221 | ||
222 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); | |
223 | break; | |
224 | ||
225 | default: | |
226 | *errp = -EINVAL; | |
227 | read_unlock_bh(&queue_lock); | |
228 | return NULL; | |
229 | } | |
230 | ||
231 | read_unlock_bh(&queue_lock); | |
232 | ||
233 | skb = alloc_skb(size, GFP_ATOMIC); | |
234 | if (!skb) | |
235 | goto nlmsg_failure; | |
236 | ||
237 | old_tail= skb->tail; | |
238 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); | |
239 | pmsg = NLMSG_DATA(nlh); | |
240 | memset(pmsg, 0, sizeof(*pmsg)); | |
241 | ||
242 | pmsg->packet_id = (unsigned long )entry; | |
243 | pmsg->data_len = data_len; | |
325ed823 HX |
244 | pmsg->timestamp_sec = entry->skb->tstamp.off_sec; |
245 | pmsg->timestamp_usec = entry->skb->tstamp.off_usec; | |
1da177e4 LT |
246 | pmsg->mark = entry->skb->nfmark; |
247 | pmsg->hook = entry->info->hook; | |
248 | pmsg->hw_protocol = entry->skb->protocol; | |
249 | ||
250 | if (entry->info->indev) | |
251 | strcpy(pmsg->indev_name, entry->info->indev->name); | |
252 | else | |
253 | pmsg->indev_name[0] = '\0'; | |
254 | ||
255 | if (entry->info->outdev) | |
256 | strcpy(pmsg->outdev_name, entry->info->outdev->name); | |
257 | else | |
258 | pmsg->outdev_name[0] = '\0'; | |
259 | ||
260 | if (entry->info->indev && entry->skb->dev) { | |
261 | pmsg->hw_type = entry->skb->dev->type; | |
262 | if (entry->skb->dev->hard_header_parse) | |
263 | pmsg->hw_addrlen = | |
264 | entry->skb->dev->hard_header_parse(entry->skb, | |
265 | pmsg->hw_addr); | |
266 | } | |
267 | ||
268 | if (data_len) | |
269 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) | |
270 | BUG(); | |
271 | ||
272 | nlh->nlmsg_len = skb->tail - old_tail; | |
273 | return skb; | |
274 | ||
275 | nlmsg_failure: | |
276 | if (skb) | |
277 | kfree_skb(skb); | |
278 | *errp = -EINVAL; | |
279 | printk(KERN_ERR "ip_queue: error creating packet message\n"); | |
280 | return NULL; | |
281 | } | |
282 | ||
283 | static int | |
0ab43f84 HW |
284 | ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
285 | unsigned int queuenum, void *data) | |
1da177e4 LT |
286 | { |
287 | int status = -EINVAL; | |
288 | struct sk_buff *nskb; | |
289 | struct ipq_queue_entry *entry; | |
290 | ||
291 | if (copy_mode == IPQ_COPY_NONE) | |
292 | return -EAGAIN; | |
293 | ||
294 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
295 | if (entry == NULL) { | |
296 | printk(KERN_ERR "ip_queue: OOM in ipq_enqueue_packet()\n"); | |
297 | return -ENOMEM; | |
298 | } | |
299 | ||
300 | entry->info = info; | |
301 | entry->skb = skb; | |
302 | ||
1da177e4 LT |
303 | nskb = ipq_build_packet_message(entry, &status); |
304 | if (nskb == NULL) | |
305 | goto err_out_free; | |
306 | ||
307 | write_lock_bh(&queue_lock); | |
308 | ||
309 | if (!peer_pid) | |
310 | goto err_out_free_nskb; | |
311 | ||
312 | if (queue_total >= queue_maxlen) { | |
313 | queue_dropped++; | |
314 | status = -ENOSPC; | |
315 | if (net_ratelimit()) | |
316 | printk (KERN_WARNING "ip_queue: full at %d entries, " | |
317 | "dropping packets(s). Dropped: %d\n", queue_total, | |
318 | queue_dropped); | |
319 | goto err_out_free_nskb; | |
320 | } | |
321 | ||
322 | /* netlink_unicast will either free the nskb or attach it to a socket */ | |
323 | status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT); | |
324 | if (status < 0) { | |
325 | queue_user_dropped++; | |
326 | goto err_out_unlock; | |
327 | } | |
328 | ||
329 | __ipq_enqueue_entry(entry); | |
330 | ||
331 | write_unlock_bh(&queue_lock); | |
332 | return status; | |
333 | ||
334 | err_out_free_nskb: | |
335 | kfree_skb(nskb); | |
336 | ||
337 | err_out_unlock: | |
338 | write_unlock_bh(&queue_lock); | |
339 | ||
340 | err_out_free: | |
341 | kfree(entry); | |
342 | return status; | |
343 | } | |
344 | ||
345 | static int | |
346 | ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct ipq_queue_entry *e) | |
347 | { | |
348 | int diff; | |
349 | struct iphdr *user_iph = (struct iphdr *)v->payload; | |
350 | ||
351 | if (v->data_len < sizeof(*user_iph)) | |
352 | return 0; | |
353 | diff = v->data_len - e->skb->len; | |
354 | if (diff < 0) | |
355 | skb_trim(e->skb, v->data_len); | |
356 | else if (diff > 0) { | |
357 | if (v->data_len > 0xFFFF) | |
358 | return -EINVAL; | |
359 | if (diff > skb_tailroom(e->skb)) { | |
360 | struct sk_buff *newskb; | |
361 | ||
362 | newskb = skb_copy_expand(e->skb, | |
363 | skb_headroom(e->skb), | |
364 | diff, | |
365 | GFP_ATOMIC); | |
366 | if (newskb == NULL) { | |
367 | printk(KERN_WARNING "ip_queue: OOM " | |
368 | "in mangle, dropping packet\n"); | |
369 | return -ENOMEM; | |
370 | } | |
371 | if (e->skb->sk) | |
372 | skb_set_owner_w(newskb, e->skb->sk); | |
373 | kfree_skb(e->skb); | |
374 | e->skb = newskb; | |
375 | } | |
376 | skb_put(e->skb, diff); | |
377 | } | |
089af26c | 378 | if (!skb_make_writable(&e->skb, v->data_len)) |
1da177e4 LT |
379 | return -ENOMEM; |
380 | memcpy(e->skb->data, v->payload, v->data_len); | |
66a79a19 | 381 | e->skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 382 | |
1da177e4 LT |
383 | return 0; |
384 | } | |
385 | ||
386 | static inline int | |
387 | id_cmp(struct ipq_queue_entry *e, unsigned long id) | |
388 | { | |
389 | return (id == (unsigned long )e); | |
390 | } | |
391 | ||
392 | static int | |
393 | ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len) | |
394 | { | |
395 | struct ipq_queue_entry *entry; | |
396 | ||
397 | if (vmsg->value > NF_MAX_VERDICT) | |
398 | return -EINVAL; | |
399 | ||
400 | entry = ipq_find_dequeue_entry(id_cmp, vmsg->id); | |
401 | if (entry == NULL) | |
402 | return -ENOENT; | |
403 | else { | |
404 | int verdict = vmsg->value; | |
405 | ||
406 | if (vmsg->data_len && vmsg->data_len == len) | |
407 | if (ipq_mangle_ipv4(vmsg, entry) < 0) | |
408 | verdict = NF_DROP; | |
409 | ||
410 | ipq_issue_verdict(entry, verdict); | |
411 | return 0; | |
412 | } | |
413 | } | |
414 | ||
415 | static int | |
416 | ipq_set_mode(unsigned char mode, unsigned int range) | |
417 | { | |
418 | int status; | |
419 | ||
420 | write_lock_bh(&queue_lock); | |
421 | status = __ipq_set_mode(mode, range); | |
422 | write_unlock_bh(&queue_lock); | |
423 | return status; | |
424 | } | |
425 | ||
426 | static int | |
427 | ipq_receive_peer(struct ipq_peer_msg *pmsg, | |
428 | unsigned char type, unsigned int len) | |
429 | { | |
430 | int status = 0; | |
431 | ||
432 | if (len < sizeof(*pmsg)) | |
433 | return -EINVAL; | |
434 | ||
435 | switch (type) { | |
436 | case IPQM_MODE: | |
437 | status = ipq_set_mode(pmsg->msg.mode.value, | |
438 | pmsg->msg.mode.range); | |
439 | break; | |
440 | ||
441 | case IPQM_VERDICT: | |
442 | if (pmsg->msg.verdict.value > NF_MAX_VERDICT) | |
443 | status = -EINVAL; | |
444 | else | |
445 | status = ipq_set_verdict(&pmsg->msg.verdict, | |
446 | len - sizeof(*pmsg)); | |
447 | break; | |
448 | default: | |
449 | status = -EINVAL; | |
450 | } | |
451 | return status; | |
452 | } | |
453 | ||
454 | static int | |
455 | dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex) | |
456 | { | |
457 | if (entry->info->indev) | |
458 | if (entry->info->indev->ifindex == ifindex) | |
459 | return 1; | |
1da177e4 LT |
460 | if (entry->info->outdev) |
461 | if (entry->info->outdev->ifindex == ifindex) | |
462 | return 1; | |
ef47c6a7 PM |
463 | #ifdef CONFIG_BRIDGE_NETFILTER |
464 | if (entry->skb->nf_bridge) { | |
465 | if (entry->skb->nf_bridge->physindev && | |
466 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
467 | return 1; | |
468 | if (entry->skb->nf_bridge->physoutdev && | |
469 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
470 | return 1; | |
471 | } | |
472 | #endif | |
1da177e4 LT |
473 | return 0; |
474 | } | |
475 | ||
476 | static void | |
477 | ipq_dev_drop(int ifindex) | |
478 | { | |
479 | struct ipq_queue_entry *entry; | |
480 | ||
481 | while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL) | |
482 | ipq_issue_verdict(entry, NF_DROP); | |
483 | } | |
484 | ||
485 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
486 | ||
487 | static inline void | |
488 | ipq_rcv_skb(struct sk_buff *skb) | |
489 | { | |
490 | int status, type, pid, flags, nlmsglen, skblen; | |
491 | struct nlmsghdr *nlh; | |
492 | ||
493 | skblen = skb->len; | |
494 | if (skblen < sizeof(*nlh)) | |
495 | return; | |
496 | ||
497 | nlh = (struct nlmsghdr *)skb->data; | |
498 | nlmsglen = nlh->nlmsg_len; | |
499 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) | |
500 | return; | |
501 | ||
502 | pid = nlh->nlmsg_pid; | |
503 | flags = nlh->nlmsg_flags; | |
504 | ||
505 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) | |
506 | RCV_SKB_FAIL(-EINVAL); | |
507 | ||
508 | if (flags & MSG_TRUNC) | |
509 | RCV_SKB_FAIL(-ECOMM); | |
510 | ||
511 | type = nlh->nlmsg_type; | |
512 | if (type < NLMSG_NOOP || type >= IPQM_MAX) | |
513 | RCV_SKB_FAIL(-EINVAL); | |
514 | ||
515 | if (type <= IPQM_BASE) | |
516 | return; | |
517 | ||
c7bdb545 | 518 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
1da177e4 LT |
519 | RCV_SKB_FAIL(-EPERM); |
520 | ||
521 | write_lock_bh(&queue_lock); | |
522 | ||
523 | if (peer_pid) { | |
524 | if (peer_pid != pid) { | |
525 | write_unlock_bh(&queue_lock); | |
526 | RCV_SKB_FAIL(-EBUSY); | |
527 | } | |
528 | } else { | |
529 | net_enable_timestamp(); | |
530 | peer_pid = pid; | |
531 | } | |
532 | ||
533 | write_unlock_bh(&queue_lock); | |
534 | ||
535 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, | |
850a9a4e | 536 | nlmsglen - NLMSG_LENGTH(0)); |
1da177e4 LT |
537 | if (status < 0) |
538 | RCV_SKB_FAIL(status); | |
539 | ||
540 | if (flags & NLM_F_ACK) | |
541 | netlink_ack(skb, nlh, 0); | |
542 | return; | |
543 | } | |
544 | ||
545 | static void | |
546 | ipq_rcv_sk(struct sock *sk, int len) | |
547 | { | |
2a0a6ebe HX |
548 | struct sk_buff *skb; |
549 | unsigned int qlen; | |
1da177e4 | 550 | |
4a3e2f71 | 551 | mutex_lock(&ipqnl_mutex); |
1da177e4 | 552 | |
2a0a6ebe HX |
553 | for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) { |
554 | skb = skb_dequeue(&sk->sk_receive_queue); | |
555 | ipq_rcv_skb(skb); | |
556 | kfree_skb(skb); | |
557 | } | |
1da177e4 | 558 | |
4a3e2f71 | 559 | mutex_unlock(&ipqnl_mutex); |
1da177e4 LT |
560 | } |
561 | ||
562 | static int | |
563 | ipq_rcv_dev_event(struct notifier_block *this, | |
564 | unsigned long event, void *ptr) | |
565 | { | |
566 | struct net_device *dev = ptr; | |
567 | ||
568 | /* Drop any packets associated with the downed device */ | |
569 | if (event == NETDEV_DOWN) | |
570 | ipq_dev_drop(dev->ifindex); | |
571 | return NOTIFY_DONE; | |
572 | } | |
573 | ||
574 | static struct notifier_block ipq_dev_notifier = { | |
575 | .notifier_call = ipq_rcv_dev_event, | |
576 | }; | |
577 | ||
578 | static int | |
579 | ipq_rcv_nl_event(struct notifier_block *this, | |
580 | unsigned long event, void *ptr) | |
581 | { | |
582 | struct netlink_notify *n = ptr; | |
583 | ||
584 | if (event == NETLINK_URELEASE && | |
585 | n->protocol == NETLINK_FIREWALL && n->pid) { | |
586 | write_lock_bh(&queue_lock); | |
587 | if (n->pid == peer_pid) | |
588 | __ipq_reset(); | |
589 | write_unlock_bh(&queue_lock); | |
590 | } | |
591 | return NOTIFY_DONE; | |
592 | } | |
593 | ||
594 | static struct notifier_block ipq_nl_notifier = { | |
595 | .notifier_call = ipq_rcv_nl_event, | |
596 | }; | |
597 | ||
598 | static struct ctl_table_header *ipq_sysctl_header; | |
599 | ||
600 | static ctl_table ipq_table[] = { | |
601 | { | |
602 | .ctl_name = NET_IPQ_QMAX, | |
603 | .procname = NET_IPQ_QMAX_NAME, | |
604 | .data = &queue_maxlen, | |
605 | .maxlen = sizeof(queue_maxlen), | |
606 | .mode = 0644, | |
607 | .proc_handler = proc_dointvec | |
608 | }, | |
609 | { .ctl_name = 0 } | |
610 | }; | |
611 | ||
612 | static ctl_table ipq_dir_table[] = { | |
613 | { | |
614 | .ctl_name = NET_IPV4, | |
615 | .procname = "ipv4", | |
616 | .mode = 0555, | |
617 | .child = ipq_table | |
618 | }, | |
619 | { .ctl_name = 0 } | |
620 | }; | |
621 | ||
622 | static ctl_table ipq_root_table[] = { | |
623 | { | |
624 | .ctl_name = CTL_NET, | |
625 | .procname = "net", | |
626 | .mode = 0555, | |
627 | .child = ipq_dir_table | |
628 | }, | |
629 | { .ctl_name = 0 } | |
630 | }; | |
631 | ||
632 | #ifdef CONFIG_PROC_FS | |
633 | static int | |
634 | ipq_get_info(char *buffer, char **start, off_t offset, int length) | |
635 | { | |
636 | int len; | |
637 | ||
638 | read_lock_bh(&queue_lock); | |
639 | ||
640 | len = sprintf(buffer, | |
641 | "Peer PID : %d\n" | |
642 | "Copy mode : %hu\n" | |
643 | "Copy range : %u\n" | |
644 | "Queue length : %u\n" | |
645 | "Queue max. length : %u\n" | |
646 | "Queue dropped : %u\n" | |
647 | "Netlink dropped : %u\n", | |
648 | peer_pid, | |
649 | copy_mode, | |
650 | copy_range, | |
651 | queue_total, | |
652 | queue_maxlen, | |
653 | queue_dropped, | |
654 | queue_user_dropped); | |
655 | ||
656 | read_unlock_bh(&queue_lock); | |
657 | ||
658 | *start = buffer + offset; | |
659 | len -= offset; | |
660 | if (len > length) | |
661 | len = length; | |
662 | else if (len < 0) | |
663 | len = 0; | |
664 | return len; | |
665 | } | |
666 | #endif /* CONFIG_PROC_FS */ | |
667 | ||
bbd86b9f HW |
668 | static struct nf_queue_handler nfqh = { |
669 | .name = "ip_queue", | |
670 | .outfn = &ipq_enqueue_packet, | |
671 | }; | |
672 | ||
32292a7f | 673 | static int __init ip_queue_init(void) |
1da177e4 LT |
674 | { |
675 | int status = -ENOMEM; | |
676 | struct proc_dir_entry *proc; | |
677 | ||
1da177e4 | 678 | netlink_register_notifier(&ipq_nl_notifier); |
06628607 | 679 | ipqnl = netlink_kernel_create(NETLINK_FIREWALL, 0, ipq_rcv_sk, |
4fdb3bb7 | 680 | THIS_MODULE); |
1da177e4 LT |
681 | if (ipqnl == NULL) { |
682 | printk(KERN_ERR "ip_queue: failed to create netlink socket\n"); | |
683 | goto cleanup_netlink_notifier; | |
684 | } | |
685 | ||
686 | proc = proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info); | |
687 | if (proc) | |
688 | proc->owner = THIS_MODULE; | |
689 | else { | |
690 | printk(KERN_ERR "ip_queue: failed to create proc entry\n"); | |
691 | goto cleanup_ipqnl; | |
692 | } | |
693 | ||
694 | register_netdevice_notifier(&ipq_dev_notifier); | |
695 | ipq_sysctl_header = register_sysctl_table(ipq_root_table, 0); | |
696 | ||
bbd86b9f | 697 | status = nf_register_queue_handler(PF_INET, &nfqh); |
1da177e4 LT |
698 | if (status < 0) { |
699 | printk(KERN_ERR "ip_queue: failed to register queue handler\n"); | |
700 | goto cleanup_sysctl; | |
701 | } | |
702 | return status; | |
703 | ||
1da177e4 LT |
704 | cleanup_sysctl: |
705 | unregister_sysctl_table(ipq_sysctl_header); | |
706 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
707 | proc_net_remove(IPQ_PROC_FS_NAME); | |
708 | ||
709 | cleanup_ipqnl: | |
710 | sock_release(ipqnl->sk_socket); | |
4a3e2f71 AV |
711 | mutex_lock(&ipqnl_mutex); |
712 | mutex_unlock(&ipqnl_mutex); | |
1da177e4 LT |
713 | |
714 | cleanup_netlink_notifier: | |
715 | netlink_unregister_notifier(&ipq_nl_notifier); | |
716 | return status; | |
717 | } | |
718 | ||
65b4b4e8 | 719 | static void __exit ip_queue_fini(void) |
1da177e4 | 720 | { |
32292a7f PM |
721 | nf_unregister_queue_handlers(&nfqh); |
722 | synchronize_net(); | |
723 | ipq_flush(NF_DROP); | |
724 | ||
725 | unregister_sysctl_table(ipq_sysctl_header); | |
726 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
727 | proc_net_remove(IPQ_PROC_FS_NAME); | |
728 | ||
729 | sock_release(ipqnl->sk_socket); | |
730 | mutex_lock(&ipqnl_mutex); | |
731 | mutex_unlock(&ipqnl_mutex); | |
732 | ||
733 | netlink_unregister_notifier(&ipq_nl_notifier); | |
1da177e4 LT |
734 | } |
735 | ||
736 | MODULE_DESCRIPTION("IPv4 packet queue handler"); | |
737 | MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>"); | |
738 | MODULE_LICENSE("GPL"); | |
739 | ||
65b4b4e8 AM |
740 | module_init(ip_queue_init); |
741 | module_exit(ip_queue_fini); |