Commit | Line | Data |
---|---|---|
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> | |
4a3e2f71 | 38 | #include <linux/mutex.h> |
1da177e4 LT |
39 | #include <net/sock.h> |
40 | #include <net/ipv6.h> | |
41 | #include <net/ip6_route.h> | |
42 | #include <linux/netfilter_ipv4/ip_queue.h> | |
43 | #include <linux/netfilter_ipv4/ip_tables.h> | |
44 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
45 | ||
46 | #define IPQ_QMAX_DEFAULT 1024 | |
47 | #define IPQ_PROC_FS_NAME "ip6_queue" | |
48 | #define NET_IPQ_QMAX 2088 | |
49 | #define NET_IPQ_QMAX_NAME "ip6_queue_maxlen" | |
50 | ||
1da177e4 LT |
51 | struct ipq_queue_entry { |
52 | struct list_head list; | |
53 | struct nf_info *info; | |
54 | struct sk_buff *skb; | |
1da177e4 LT |
55 | }; |
56 | ||
57 | typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long); | |
58 | ||
1192e403 | 59 | static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE; |
94aec08e | 60 | static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT; |
1da177e4 | 61 | static DEFINE_RWLOCK(queue_lock); |
1192e403 BH |
62 | static int peer_pid __read_mostly; |
63 | static unsigned int copy_range __read_mostly; | |
1da177e4 LT |
64 | static unsigned int queue_total; |
65 | static unsigned int queue_dropped = 0; | |
66 | static unsigned int queue_user_dropped = 0; | |
1192e403 | 67 | static struct sock *ipqnl __read_mostly; |
1da177e4 | 68 | static LIST_HEAD(queue_list); |
4a3e2f71 | 69 | static DEFINE_MUTEX(ipqnl_mutex); |
1da177e4 LT |
70 | |
71 | static void | |
72 | ipq_issue_verdict(struct ipq_queue_entry *entry, int verdict) | |
73 | { | |
4c1217de | 74 | local_bh_disable(); |
1da177e4 | 75 | nf_reinject(entry->skb, entry->info, verdict); |
4c1217de | 76 | local_bh_enable(); |
1da177e4 LT |
77 | kfree(entry); |
78 | } | |
79 | ||
80 | static inline void | |
81 | __ipq_enqueue_entry(struct ipq_queue_entry *entry) | |
82 | { | |
83 | list_add(&entry->list, &queue_list); | |
84 | queue_total++; | |
85 | } | |
86 | ||
87 | /* | |
88 | * Find and return a queued entry matched by cmpfn, or return the last | |
89 | * entry if cmpfn is NULL. | |
90 | */ | |
91 | static inline struct ipq_queue_entry * | |
92 | __ipq_find_entry(ipq_cmpfn cmpfn, unsigned long data) | |
93 | { | |
94 | struct list_head *p; | |
95 | ||
96 | list_for_each_prev(p, &queue_list) { | |
97 | struct ipq_queue_entry *entry = (struct ipq_queue_entry *)p; | |
1ab1457c | 98 | |
1da177e4 LT |
99 | if (!cmpfn || cmpfn(entry, data)) |
100 | return entry; | |
101 | } | |
102 | return NULL; | |
103 | } | |
104 | ||
105 | static inline void | |
106 | __ipq_dequeue_entry(struct ipq_queue_entry *entry) | |
107 | { | |
108 | list_del(&entry->list); | |
109 | queue_total--; | |
110 | } | |
111 | ||
112 | static inline struct ipq_queue_entry * | |
113 | __ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data) | |
114 | { | |
115 | struct ipq_queue_entry *entry; | |
116 | ||
117 | entry = __ipq_find_entry(cmpfn, data); | |
118 | if (entry == NULL) | |
119 | return NULL; | |
120 | ||
121 | __ipq_dequeue_entry(entry); | |
122 | return entry; | |
123 | } | |
124 | ||
125 | ||
126 | static inline void | |
127 | __ipq_flush(int verdict) | |
128 | { | |
129 | struct ipq_queue_entry *entry; | |
1ab1457c | 130 | |
1da177e4 LT |
131 | while ((entry = __ipq_find_dequeue_entry(NULL, 0))) |
132 | ipq_issue_verdict(entry, verdict); | |
133 | } | |
134 | ||
135 | static inline int | |
136 | __ipq_set_mode(unsigned char mode, unsigned int range) | |
137 | { | |
138 | int status = 0; | |
1ab1457c | 139 | |
1da177e4 LT |
140 | switch(mode) { |
141 | case IPQ_COPY_NONE: | |
142 | case IPQ_COPY_META: | |
143 | copy_mode = mode; | |
144 | copy_range = 0; | |
145 | break; | |
1ab1457c | 146 | |
1da177e4 LT |
147 | case IPQ_COPY_PACKET: |
148 | copy_mode = mode; | |
149 | copy_range = range; | |
150 | if (copy_range > 0xFFFF) | |
151 | copy_range = 0xFFFF; | |
152 | break; | |
1ab1457c | 153 | |
1da177e4 LT |
154 | default: |
155 | status = -EINVAL; | |
156 | ||
157 | } | |
158 | return status; | |
159 | } | |
160 | ||
161 | static inline void | |
162 | __ipq_reset(void) | |
163 | { | |
164 | peer_pid = 0; | |
165 | net_disable_timestamp(); | |
166 | __ipq_set_mode(IPQ_COPY_NONE, 0); | |
167 | __ipq_flush(NF_DROP); | |
168 | } | |
169 | ||
170 | static struct ipq_queue_entry * | |
171 | ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data) | |
172 | { | |
173 | struct ipq_queue_entry *entry; | |
1ab1457c | 174 | |
1da177e4 LT |
175 | write_lock_bh(&queue_lock); |
176 | entry = __ipq_find_dequeue_entry(cmpfn, data); | |
177 | write_unlock_bh(&queue_lock); | |
178 | return entry; | |
179 | } | |
180 | ||
181 | static void | |
182 | ipq_flush(int verdict) | |
183 | { | |
184 | write_lock_bh(&queue_lock); | |
185 | __ipq_flush(verdict); | |
186 | write_unlock_bh(&queue_lock); | |
187 | } | |
188 | ||
189 | static struct sk_buff * | |
190 | ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp) | |
191 | { | |
27a884dc | 192 | sk_buff_data_t old_tail; |
1da177e4 LT |
193 | size_t size = 0; |
194 | size_t data_len = 0; | |
195 | struct sk_buff *skb; | |
196 | struct ipq_packet_msg *pmsg; | |
197 | struct nlmsghdr *nlh; | |
b7aa0bf7 | 198 | struct timeval tv; |
1da177e4 LT |
199 | |
200 | read_lock_bh(&queue_lock); | |
1ab1457c | 201 | |
1da177e4 LT |
202 | switch (copy_mode) { |
203 | case IPQ_COPY_META: | |
204 | case IPQ_COPY_NONE: | |
205 | size = NLMSG_SPACE(sizeof(*pmsg)); | |
206 | data_len = 0; | |
207 | break; | |
1ab1457c | 208 | |
1da177e4 | 209 | case IPQ_COPY_PACKET: |
84fa7933 PM |
210 | if ((entry->skb->ip_summed == CHECKSUM_PARTIAL || |
211 | entry->skb->ip_summed == CHECKSUM_COMPLETE) && | |
212 | (*errp = skb_checksum_help(entry->skb))) { | |
66a79a19 PM |
213 | read_unlock_bh(&queue_lock); |
214 | return NULL; | |
215 | } | |
1da177e4 LT |
216 | if (copy_range == 0 || copy_range > entry->skb->len) |
217 | data_len = entry->skb->len; | |
218 | else | |
219 | data_len = copy_range; | |
1ab1457c | 220 | |
1da177e4 LT |
221 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); |
222 | break; | |
1ab1457c | 223 | |
1da177e4 LT |
224 | default: |
225 | *errp = -EINVAL; | |
226 | read_unlock_bh(&queue_lock); | |
227 | return NULL; | |
228 | } | |
229 | ||
230 | read_unlock_bh(&queue_lock); | |
231 | ||
232 | skb = alloc_skb(size, GFP_ATOMIC); | |
233 | if (!skb) | |
234 | goto nlmsg_failure; | |
1ab1457c | 235 | |
27a884dc | 236 | old_tail = skb->tail; |
1da177e4 LT |
237 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); |
238 | pmsg = NLMSG_DATA(nlh); | |
239 | memset(pmsg, 0, sizeof(*pmsg)); | |
240 | ||
241 | pmsg->packet_id = (unsigned long )entry; | |
242 | pmsg->data_len = data_len; | |
b7aa0bf7 ED |
243 | tv = ktime_to_timeval(entry->skb->tstamp); |
244 | pmsg->timestamp_sec = tv.tv_sec; | |
245 | pmsg->timestamp_usec = tv.tv_usec; | |
82e91ffe | 246 | pmsg->mark = entry->skb->mark; |
1da177e4 LT |
247 | pmsg->hook = entry->info->hook; |
248 | pmsg->hw_protocol = entry->skb->protocol; | |
1ab1457c | 249 | |
1da177e4 LT |
250 | if (entry->info->indev) |
251 | strcpy(pmsg->indev_name, entry->info->indev->name); | |
252 | else | |
253 | pmsg->indev_name[0] = '\0'; | |
1ab1457c | 254 | |
1da177e4 LT |
255 | if (entry->info->outdev) |
256 | strcpy(pmsg->outdev_name, entry->info->outdev->name); | |
257 | else | |
258 | pmsg->outdev_name[0] = '\0'; | |
1ab1457c | 259 | |
1da177e4 LT |
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, | |
1ab1457c | 265 | pmsg->hw_addr); |
1da177e4 | 266 | } |
1ab1457c | 267 | |
1da177e4 LT |
268 | if (data_len) |
269 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) | |
270 | BUG(); | |
1ab1457c | 271 | |
1da177e4 LT |
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 "ip6_queue: error creating packet message\n"); | |
280 | return NULL; | |
281 | } | |
282 | ||
283 | static int | |
1ab1457c | 284 | ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
0ab43f84 | 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 "ip6_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; | |
1ab1457c | 306 | |
1da177e4 | 307 | write_lock_bh(&queue_lock); |
1ab1457c | 308 | |
1da177e4 | 309 | if (!peer_pid) |
1ab1457c | 310 | goto err_out_free_nskb; |
1da177e4 LT |
311 | |
312 | if (queue_total >= queue_maxlen) { | |
1ab1457c | 313 | queue_dropped++; |
1da177e4 LT |
314 | status = -ENOSPC; |
315 | if (net_ratelimit()) | |
1ab1457c | 316 | printk (KERN_WARNING "ip6_queue: fill at %d entries, " |
1da177e4 LT |
317 | "dropping packet(s). Dropped: %d\n", queue_total, |
318 | queue_dropped); | |
319 | goto err_out_free_nskb; | |
320 | } | |
321 | ||
1ab1457c | 322 | /* netlink_unicast will either free the nskb or attach it to a socket */ |
1da177e4 LT |
323 | status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT); |
324 | if (status < 0) { | |
1ab1457c | 325 | queue_user_dropped++; |
1da177e4 LT |
326 | goto err_out_unlock; |
327 | } | |
1ab1457c | 328 | |
1da177e4 LT |
329 | __ipq_enqueue_entry(entry); |
330 | ||
331 | write_unlock_bh(&queue_lock); | |
332 | return status; | |
1ab1457c | 333 | |
1da177e4 | 334 | err_out_free_nskb: |
1ab1457c YH |
335 | kfree_skb(nskb); |
336 | ||
1da177e4 LT |
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_ipv6(ipq_verdict_msg_t *v, struct ipq_queue_entry *e) | |
347 | { | |
348 | int diff; | |
349 | struct ipv6hdr *user_iph = (struct ipv6hdr *)v->payload; | |
350 | ||
351 | if (v->data_len < sizeof(*user_iph)) | |
352 | return 0; | |
353 | diff = v->data_len - e->skb->len; | |
d8a585d7 PM |
354 | if (diff < 0) { |
355 | if (pskb_trim(e->skb, v->data_len)) | |
356 | return -ENOMEM; | |
357 | } else if (diff > 0) { | |
1da177e4 LT |
358 | if (v->data_len > 0xFFFF) |
359 | return -EINVAL; | |
360 | if (diff > skb_tailroom(e->skb)) { | |
361 | struct sk_buff *newskb; | |
1ab1457c | 362 | |
1da177e4 | 363 | newskb = skb_copy_expand(e->skb, |
1ab1457c YH |
364 | skb_headroom(e->skb), |
365 | diff, | |
366 | GFP_ATOMIC); | |
1da177e4 LT |
367 | if (newskb == NULL) { |
368 | printk(KERN_WARNING "ip6_queue: OOM " | |
369 | "in mangle, dropping packet\n"); | |
370 | return -ENOMEM; | |
371 | } | |
372 | if (e->skb->sk) | |
373 | skb_set_owner_w(newskb, e->skb->sk); | |
374 | kfree_skb(e->skb); | |
375 | e->skb = newskb; | |
376 | } | |
377 | skb_put(e->skb, diff); | |
378 | } | |
089af26c | 379 | if (!skb_make_writable(&e->skb, v->data_len)) |
1da177e4 LT |
380 | return -ENOMEM; |
381 | memcpy(e->skb->data, v->payload, v->data_len); | |
66a79a19 | 382 | e->skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 383 | |
1da177e4 LT |
384 | return 0; |
385 | } | |
386 | ||
387 | static inline int | |
388 | id_cmp(struct ipq_queue_entry *e, unsigned long id) | |
389 | { | |
390 | return (id == (unsigned long )e); | |
391 | } | |
392 | ||
393 | static int | |
394 | ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len) | |
395 | { | |
396 | struct ipq_queue_entry *entry; | |
397 | ||
398 | if (vmsg->value > NF_MAX_VERDICT) | |
399 | return -EINVAL; | |
400 | ||
401 | entry = ipq_find_dequeue_entry(id_cmp, vmsg->id); | |
402 | if (entry == NULL) | |
403 | return -ENOENT; | |
404 | else { | |
405 | int verdict = vmsg->value; | |
1ab1457c | 406 | |
1da177e4 LT |
407 | if (vmsg->data_len && vmsg->data_len == len) |
408 | if (ipq_mangle_ipv6(vmsg, entry) < 0) | |
409 | verdict = NF_DROP; | |
1ab1457c | 410 | |
1da177e4 LT |
411 | ipq_issue_verdict(entry, verdict); |
412 | return 0; | |
413 | } | |
414 | } | |
415 | ||
416 | static int | |
417 | ipq_set_mode(unsigned char mode, unsigned int range) | |
418 | { | |
419 | int status; | |
420 | ||
421 | write_lock_bh(&queue_lock); | |
422 | status = __ipq_set_mode(mode, range); | |
423 | write_unlock_bh(&queue_lock); | |
424 | return status; | |
425 | } | |
426 | ||
427 | static int | |
428 | ipq_receive_peer(struct ipq_peer_msg *pmsg, | |
1ab1457c | 429 | unsigned char type, unsigned int len) |
1da177e4 LT |
430 | { |
431 | int status = 0; | |
432 | ||
433 | if (len < sizeof(*pmsg)) | |
434 | return -EINVAL; | |
435 | ||
436 | switch (type) { | |
437 | case IPQM_MODE: | |
438 | status = ipq_set_mode(pmsg->msg.mode.value, | |
1ab1457c | 439 | pmsg->msg.mode.range); |
1da177e4 | 440 | break; |
1ab1457c | 441 | |
1da177e4 LT |
442 | case IPQM_VERDICT: |
443 | if (pmsg->msg.verdict.value > NF_MAX_VERDICT) | |
444 | status = -EINVAL; | |
445 | else | |
446 | status = ipq_set_verdict(&pmsg->msg.verdict, | |
1ab1457c | 447 | len - sizeof(*pmsg)); |
1da177e4 LT |
448 | break; |
449 | default: | |
450 | status = -EINVAL; | |
451 | } | |
452 | return status; | |
453 | } | |
454 | ||
455 | static int | |
456 | dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex) | |
457 | { | |
458 | if (entry->info->indev) | |
459 | if (entry->info->indev->ifindex == ifindex) | |
460 | return 1; | |
1ab1457c | 461 | |
1da177e4 LT |
462 | if (entry->info->outdev) |
463 | if (entry->info->outdev->ifindex == ifindex) | |
464 | return 1; | |
465 | ||
466 | return 0; | |
467 | } | |
468 | ||
469 | static void | |
470 | ipq_dev_drop(int ifindex) | |
471 | { | |
472 | struct ipq_queue_entry *entry; | |
1ab1457c | 473 | |
1da177e4 LT |
474 | while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL) |
475 | ipq_issue_verdict(entry, NF_DROP); | |
476 | } | |
477 | ||
478 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
479 | ||
480 | static inline void | |
481 | ipq_rcv_skb(struct sk_buff *skb) | |
482 | { | |
483 | int status, type, pid, flags, nlmsglen, skblen; | |
484 | struct nlmsghdr *nlh; | |
485 | ||
486 | skblen = skb->len; | |
487 | if (skblen < sizeof(*nlh)) | |
488 | return; | |
489 | ||
490 | nlh = (struct nlmsghdr *)skb->data; | |
491 | nlmsglen = nlh->nlmsg_len; | |
492 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) | |
493 | return; | |
494 | ||
495 | pid = nlh->nlmsg_pid; | |
496 | flags = nlh->nlmsg_flags; | |
1ab1457c | 497 | |
1da177e4 LT |
498 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) |
499 | RCV_SKB_FAIL(-EINVAL); | |
1ab1457c | 500 | |
1da177e4 LT |
501 | if (flags & MSG_TRUNC) |
502 | RCV_SKB_FAIL(-ECOMM); | |
1ab1457c | 503 | |
1da177e4 LT |
504 | type = nlh->nlmsg_type; |
505 | if (type < NLMSG_NOOP || type >= IPQM_MAX) | |
506 | RCV_SKB_FAIL(-EINVAL); | |
1ab1457c | 507 | |
1da177e4 LT |
508 | if (type <= IPQM_BASE) |
509 | return; | |
1ab1457c | 510 | |
c7bdb545 | 511 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
1ab1457c | 512 | RCV_SKB_FAIL(-EPERM); |
1da177e4 LT |
513 | |
514 | write_lock_bh(&queue_lock); | |
1ab1457c | 515 | |
1da177e4 LT |
516 | if (peer_pid) { |
517 | if (peer_pid != pid) { | |
518 | write_unlock_bh(&queue_lock); | |
519 | RCV_SKB_FAIL(-EBUSY); | |
520 | } | |
521 | } else { | |
522 | net_enable_timestamp(); | |
523 | peer_pid = pid; | |
524 | } | |
1ab1457c | 525 | |
1da177e4 | 526 | write_unlock_bh(&queue_lock); |
1ab1457c | 527 | |
1da177e4 | 528 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, |
1ab1457c | 529 | nlmsglen - NLMSG_LENGTH(0)); |
1da177e4 LT |
530 | if (status < 0) |
531 | RCV_SKB_FAIL(status); | |
1ab1457c | 532 | |
1da177e4 LT |
533 | if (flags & NLM_F_ACK) |
534 | netlink_ack(skb, nlh, 0); | |
1ab1457c | 535 | return; |
1da177e4 LT |
536 | } |
537 | ||
538 | static void | |
539 | ipq_rcv_sk(struct sock *sk, int len) | |
540 | { | |
2a0a6ebe HX |
541 | struct sk_buff *skb; |
542 | unsigned int qlen; | |
1da177e4 | 543 | |
4a3e2f71 | 544 | mutex_lock(&ipqnl_mutex); |
1ab1457c | 545 | |
2a0a6ebe HX |
546 | for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) { |
547 | skb = skb_dequeue(&sk->sk_receive_queue); | |
548 | ipq_rcv_skb(skb); | |
549 | kfree_skb(skb); | |
550 | } | |
1ab1457c | 551 | |
4a3e2f71 | 552 | mutex_unlock(&ipqnl_mutex); |
1da177e4 LT |
553 | } |
554 | ||
555 | static int | |
556 | ipq_rcv_dev_event(struct notifier_block *this, | |
1ab1457c | 557 | unsigned long event, void *ptr) |
1da177e4 LT |
558 | { |
559 | struct net_device *dev = ptr; | |
560 | ||
561 | /* Drop any packets associated with the downed device */ | |
562 | if (event == NETDEV_DOWN) | |
563 | ipq_dev_drop(dev->ifindex); | |
564 | return NOTIFY_DONE; | |
565 | } | |
566 | ||
567 | static struct notifier_block ipq_dev_notifier = { | |
568 | .notifier_call = ipq_rcv_dev_event, | |
569 | }; | |
570 | ||
571 | static int | |
572 | ipq_rcv_nl_event(struct notifier_block *this, | |
1ab1457c | 573 | unsigned long event, void *ptr) |
1da177e4 LT |
574 | { |
575 | struct netlink_notify *n = ptr; | |
576 | ||
577 | if (event == NETLINK_URELEASE && | |
578 | n->protocol == NETLINK_IP6_FW && n->pid) { | |
579 | write_lock_bh(&queue_lock); | |
580 | if (n->pid == peer_pid) | |
581 | __ipq_reset(); | |
582 | write_unlock_bh(&queue_lock); | |
583 | } | |
584 | return NOTIFY_DONE; | |
585 | } | |
586 | ||
587 | static struct notifier_block ipq_nl_notifier = { | |
588 | .notifier_call = ipq_rcv_nl_event, | |
589 | }; | |
590 | ||
591 | static struct ctl_table_header *ipq_sysctl_header; | |
592 | ||
593 | static ctl_table ipq_table[] = { | |
594 | { | |
595 | .ctl_name = NET_IPQ_QMAX, | |
596 | .procname = NET_IPQ_QMAX_NAME, | |
597 | .data = &queue_maxlen, | |
598 | .maxlen = sizeof(queue_maxlen), | |
599 | .mode = 0644, | |
600 | .proc_handler = proc_dointvec | |
601 | }, | |
1ab1457c | 602 | { .ctl_name = 0 } |
1da177e4 LT |
603 | }; |
604 | ||
605 | static ctl_table ipq_dir_table[] = { | |
606 | { | |
607 | .ctl_name = NET_IPV6, | |
608 | .procname = "ipv6", | |
609 | .mode = 0555, | |
610 | .child = ipq_table | |
611 | }, | |
612 | { .ctl_name = 0 } | |
613 | }; | |
614 | ||
615 | static ctl_table ipq_root_table[] = { | |
616 | { | |
617 | .ctl_name = CTL_NET, | |
618 | .procname = "net", | |
619 | .mode = 0555, | |
620 | .child = ipq_dir_table | |
621 | }, | |
622 | { .ctl_name = 0 } | |
623 | }; | |
624 | ||
76592584 | 625 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
626 | static int |
627 | ipq_get_info(char *buffer, char **start, off_t offset, int length) | |
628 | { | |
629 | int len; | |
630 | ||
631 | read_lock_bh(&queue_lock); | |
1ab1457c | 632 | |
1da177e4 | 633 | len = sprintf(buffer, |
1ab1457c YH |
634 | "Peer PID : %d\n" |
635 | "Copy mode : %hu\n" | |
636 | "Copy range : %u\n" | |
637 | "Queue length : %u\n" | |
638 | "Queue max. length : %u\n" | |
1da177e4 LT |
639 | "Queue dropped : %u\n" |
640 | "Netfilter dropped : %u\n", | |
1ab1457c YH |
641 | peer_pid, |
642 | copy_mode, | |
643 | copy_range, | |
644 | queue_total, | |
645 | queue_maxlen, | |
1da177e4 LT |
646 | queue_dropped, |
647 | queue_user_dropped); | |
648 | ||
649 | read_unlock_bh(&queue_lock); | |
1ab1457c | 650 | |
1da177e4 LT |
651 | *start = buffer + offset; |
652 | len -= offset; | |
653 | if (len > length) | |
654 | len = length; | |
655 | else if (len < 0) | |
656 | len = 0; | |
657 | return len; | |
658 | } | |
76592584 | 659 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 660 | |
bbd86b9f HW |
661 | static struct nf_queue_handler nfqh = { |
662 | .name = "ip6_queue", | |
663 | .outfn = &ipq_enqueue_packet, | |
664 | }; | |
665 | ||
32292a7f | 666 | static int __init ip6_queue_init(void) |
1da177e4 LT |
667 | { |
668 | int status = -ENOMEM; | |
669 | struct proc_dir_entry *proc; | |
1ab1457c | 670 | |
1da177e4 | 671 | netlink_register_notifier(&ipq_nl_notifier); |
06628607 | 672 | ipqnl = netlink_kernel_create(NETLINK_IP6_FW, 0, ipq_rcv_sk, |
1ab1457c | 673 | THIS_MODULE); |
1da177e4 LT |
674 | if (ipqnl == NULL) { |
675 | printk(KERN_ERR "ip6_queue: failed to create netlink socket\n"); | |
676 | goto cleanup_netlink_notifier; | |
677 | } | |
678 | ||
679 | proc = proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info); | |
680 | if (proc) | |
681 | proc->owner = THIS_MODULE; | |
682 | else { | |
683 | printk(KERN_ERR "ip6_queue: failed to create proc entry\n"); | |
684 | goto cleanup_ipqnl; | |
685 | } | |
1ab1457c | 686 | |
1da177e4 | 687 | register_netdevice_notifier(&ipq_dev_notifier); |
0b4d4147 | 688 | ipq_sysctl_header = register_sysctl_table(ipq_root_table); |
1ab1457c | 689 | |
bbd86b9f | 690 | status = nf_register_queue_handler(PF_INET6, &nfqh); |
1da177e4 LT |
691 | if (status < 0) { |
692 | printk(KERN_ERR "ip6_queue: failed to register queue handler\n"); | |
693 | goto cleanup_sysctl; | |
694 | } | |
695 | return status; | |
696 | ||
1da177e4 LT |
697 | cleanup_sysctl: |
698 | unregister_sysctl_table(ipq_sysctl_header); | |
699 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
700 | proc_net_remove(IPQ_PROC_FS_NAME); | |
1ab1457c | 701 | |
1da177e4 LT |
702 | cleanup_ipqnl: |
703 | sock_release(ipqnl->sk_socket); | |
4a3e2f71 AV |
704 | mutex_lock(&ipqnl_mutex); |
705 | mutex_unlock(&ipqnl_mutex); | |
1ab1457c | 706 | |
1da177e4 LT |
707 | cleanup_netlink_notifier: |
708 | netlink_unregister_notifier(&ipq_nl_notifier); | |
709 | return status; | |
710 | } | |
711 | ||
65b4b4e8 | 712 | static void __exit ip6_queue_fini(void) |
1da177e4 | 713 | { |
32292a7f PM |
714 | nf_unregister_queue_handlers(&nfqh); |
715 | synchronize_net(); | |
716 | ipq_flush(NF_DROP); | |
717 | ||
718 | unregister_sysctl_table(ipq_sysctl_header); | |
719 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
720 | proc_net_remove(IPQ_PROC_FS_NAME); | |
721 | ||
722 | sock_release(ipqnl->sk_socket); | |
723 | mutex_lock(&ipqnl_mutex); | |
724 | mutex_unlock(&ipqnl_mutex); | |
725 | ||
726 | netlink_unregister_notifier(&ipq_nl_notifier); | |
1da177e4 LT |
727 | } |
728 | ||
729 | MODULE_DESCRIPTION("IPv6 packet queue handler"); | |
730 | MODULE_LICENSE("GPL"); | |
731 | ||
65b4b4e8 AM |
732 | module_init(ip6_queue_init); |
733 | module_exit(ip6_queue_fini); |