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. | |
1da177e4 LT |
11 | */ |
12 | #include <linux/module.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/ip.h> | |
16 | #include <linux/notifier.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/netfilter.h> | |
19 | #include <linux/netfilter_ipv4/ip_queue.h> | |
20 | #include <linux/netfilter_ipv4/ip_tables.h> | |
21 | #include <linux/netlink.h> | |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/sysctl.h> | |
24 | #include <linux/proc_fs.h> | |
25 | #include <linux/security.h> | |
4a3e2f71 | 26 | #include <linux/mutex.h> |
1da177e4 LT |
27 | #include <net/sock.h> |
28 | #include <net/route.h> | |
29 | ||
30 | #define IPQ_QMAX_DEFAULT 1024 | |
31 | #define IPQ_PROC_FS_NAME "ip_queue" | |
32 | #define NET_IPQ_QMAX 2088 | |
33 | #define NET_IPQ_QMAX_NAME "ip_queue_maxlen" | |
34 | ||
1da177e4 LT |
35 | struct ipq_queue_entry { |
36 | struct list_head list; | |
37 | struct nf_info *info; | |
38 | struct sk_buff *skb; | |
1da177e4 LT |
39 | }; |
40 | ||
41 | typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long); | |
42 | ||
1192e403 | 43 | static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE; |
94aec08e | 44 | static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT; |
1da177e4 | 45 | static DEFINE_RWLOCK(queue_lock); |
1192e403 BH |
46 | static int peer_pid __read_mostly; |
47 | static unsigned int copy_range __read_mostly; | |
1da177e4 LT |
48 | static unsigned int queue_total; |
49 | static unsigned int queue_dropped = 0; | |
50 | static unsigned int queue_user_dropped = 0; | |
1192e403 | 51 | static struct sock *ipqnl __read_mostly; |
1da177e4 | 52 | static LIST_HEAD(queue_list); |
4a3e2f71 | 53 | static DEFINE_MUTEX(ipqnl_mutex); |
1da177e4 LT |
54 | |
55 | static void | |
56 | ipq_issue_verdict(struct ipq_queue_entry *entry, int verdict) | |
57 | { | |
9bb7bc94 HW |
58 | /* TCP input path (and probably other bits) assume to be called |
59 | * from softirq context, not from syscall, like ipq_issue_verdict is | |
60 | * called. TCP input path deadlocks with locks taken from timer | |
61 | * softirq, e.g. We therefore emulate this by local_bh_disable() */ | |
62 | ||
63 | local_bh_disable(); | |
1da177e4 | 64 | nf_reinject(entry->skb, entry->info, verdict); |
9bb7bc94 HW |
65 | local_bh_enable(); |
66 | ||
1da177e4 LT |
67 | kfree(entry); |
68 | } | |
69 | ||
70 | static inline void | |
71 | __ipq_enqueue_entry(struct ipq_queue_entry *entry) | |
72 | { | |
73 | list_add(&entry->list, &queue_list); | |
74 | queue_total++; | |
75 | } | |
76 | ||
77 | /* | |
78 | * Find and return a queued entry matched by cmpfn, or return the last | |
79 | * entry if cmpfn is NULL. | |
80 | */ | |
81 | static inline struct ipq_queue_entry * | |
82 | __ipq_find_entry(ipq_cmpfn cmpfn, unsigned long data) | |
83 | { | |
84 | struct list_head *p; | |
85 | ||
86 | list_for_each_prev(p, &queue_list) { | |
87 | struct ipq_queue_entry *entry = (struct ipq_queue_entry *)p; | |
e905a9ed | 88 | |
1da177e4 LT |
89 | if (!cmpfn || cmpfn(entry, data)) |
90 | return entry; | |
91 | } | |
92 | return NULL; | |
93 | } | |
94 | ||
95 | static inline void | |
96 | __ipq_dequeue_entry(struct ipq_queue_entry *entry) | |
97 | { | |
98 | list_del(&entry->list); | |
99 | queue_total--; | |
100 | } | |
101 | ||
102 | static inline struct ipq_queue_entry * | |
103 | __ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data) | |
104 | { | |
105 | struct ipq_queue_entry *entry; | |
106 | ||
107 | entry = __ipq_find_entry(cmpfn, data); | |
108 | if (entry == NULL) | |
109 | return NULL; | |
110 | ||
111 | __ipq_dequeue_entry(entry); | |
112 | return entry; | |
113 | } | |
114 | ||
115 | ||
116 | static inline void | |
117 | __ipq_flush(int verdict) | |
118 | { | |
119 | struct ipq_queue_entry *entry; | |
e905a9ed | 120 | |
1da177e4 LT |
121 | while ((entry = __ipq_find_dequeue_entry(NULL, 0))) |
122 | ipq_issue_verdict(entry, verdict); | |
123 | } | |
124 | ||
125 | static inline int | |
126 | __ipq_set_mode(unsigned char mode, unsigned int range) | |
127 | { | |
128 | int status = 0; | |
e905a9ed | 129 | |
1da177e4 LT |
130 | switch(mode) { |
131 | case IPQ_COPY_NONE: | |
132 | case IPQ_COPY_META: | |
133 | copy_mode = mode; | |
134 | copy_range = 0; | |
135 | break; | |
e905a9ed | 136 | |
1da177e4 LT |
137 | case IPQ_COPY_PACKET: |
138 | copy_mode = mode; | |
139 | copy_range = range; | |
140 | if (copy_range > 0xFFFF) | |
141 | copy_range = 0xFFFF; | |
142 | break; | |
e905a9ed | 143 | |
1da177e4 LT |
144 | default: |
145 | status = -EINVAL; | |
146 | ||
147 | } | |
148 | return status; | |
149 | } | |
150 | ||
151 | static inline void | |
152 | __ipq_reset(void) | |
153 | { | |
154 | peer_pid = 0; | |
155 | net_disable_timestamp(); | |
156 | __ipq_set_mode(IPQ_COPY_NONE, 0); | |
157 | __ipq_flush(NF_DROP); | |
158 | } | |
159 | ||
160 | static struct ipq_queue_entry * | |
161 | ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data) | |
162 | { | |
163 | struct ipq_queue_entry *entry; | |
e905a9ed | 164 | |
1da177e4 LT |
165 | write_lock_bh(&queue_lock); |
166 | entry = __ipq_find_dequeue_entry(cmpfn, data); | |
167 | write_unlock_bh(&queue_lock); | |
168 | return entry; | |
169 | } | |
170 | ||
171 | static void | |
172 | ipq_flush(int verdict) | |
173 | { | |
174 | write_lock_bh(&queue_lock); | |
175 | __ipq_flush(verdict); | |
176 | write_unlock_bh(&queue_lock); | |
177 | } | |
178 | ||
179 | static struct sk_buff * | |
180 | ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp) | |
181 | { | |
27a884dc | 182 | sk_buff_data_t old_tail; |
1da177e4 LT |
183 | size_t size = 0; |
184 | size_t data_len = 0; | |
185 | struct sk_buff *skb; | |
186 | struct ipq_packet_msg *pmsg; | |
187 | struct nlmsghdr *nlh; | |
b7aa0bf7 | 188 | struct timeval tv; |
1da177e4 LT |
189 | |
190 | read_lock_bh(&queue_lock); | |
e905a9ed | 191 | |
1da177e4 LT |
192 | switch (copy_mode) { |
193 | case IPQ_COPY_META: | |
194 | case IPQ_COPY_NONE: | |
195 | size = NLMSG_SPACE(sizeof(*pmsg)); | |
196 | data_len = 0; | |
197 | break; | |
e905a9ed | 198 | |
1da177e4 | 199 | case IPQ_COPY_PACKET: |
84fa7933 PM |
200 | if ((entry->skb->ip_summed == CHECKSUM_PARTIAL || |
201 | entry->skb->ip_summed == CHECKSUM_COMPLETE) && | |
202 | (*errp = skb_checksum_help(entry->skb))) { | |
66a79a19 PM |
203 | read_unlock_bh(&queue_lock); |
204 | return NULL; | |
205 | } | |
1da177e4 LT |
206 | if (copy_range == 0 || copy_range > entry->skb->len) |
207 | data_len = entry->skb->len; | |
208 | else | |
209 | data_len = copy_range; | |
e905a9ed | 210 | |
1da177e4 LT |
211 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); |
212 | break; | |
e905a9ed | 213 | |
1da177e4 LT |
214 | default: |
215 | *errp = -EINVAL; | |
216 | read_unlock_bh(&queue_lock); | |
217 | return NULL; | |
218 | } | |
219 | ||
220 | read_unlock_bh(&queue_lock); | |
221 | ||
222 | skb = alloc_skb(size, GFP_ATOMIC); | |
223 | if (!skb) | |
224 | goto nlmsg_failure; | |
e905a9ed | 225 | |
27a884dc | 226 | old_tail = skb->tail; |
1da177e4 LT |
227 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); |
228 | pmsg = NLMSG_DATA(nlh); | |
229 | memset(pmsg, 0, sizeof(*pmsg)); | |
230 | ||
231 | pmsg->packet_id = (unsigned long )entry; | |
232 | pmsg->data_len = data_len; | |
b7aa0bf7 ED |
233 | tv = ktime_to_timeval(entry->skb->tstamp); |
234 | pmsg->timestamp_sec = tv.tv_sec; | |
235 | pmsg->timestamp_usec = tv.tv_usec; | |
82e91ffe | 236 | pmsg->mark = entry->skb->mark; |
1da177e4 LT |
237 | pmsg->hook = entry->info->hook; |
238 | pmsg->hw_protocol = entry->skb->protocol; | |
e905a9ed | 239 | |
1da177e4 LT |
240 | if (entry->info->indev) |
241 | strcpy(pmsg->indev_name, entry->info->indev->name); | |
242 | else | |
243 | pmsg->indev_name[0] = '\0'; | |
e905a9ed | 244 | |
1da177e4 LT |
245 | if (entry->info->outdev) |
246 | strcpy(pmsg->outdev_name, entry->info->outdev->name); | |
247 | else | |
248 | pmsg->outdev_name[0] = '\0'; | |
e905a9ed | 249 | |
1da177e4 LT |
250 | if (entry->info->indev && entry->skb->dev) { |
251 | pmsg->hw_type = entry->skb->dev->type; | |
252 | if (entry->skb->dev->hard_header_parse) | |
253 | pmsg->hw_addrlen = | |
254 | entry->skb->dev->hard_header_parse(entry->skb, | |
e905a9ed | 255 | pmsg->hw_addr); |
1da177e4 | 256 | } |
e905a9ed | 257 | |
1da177e4 LT |
258 | if (data_len) |
259 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) | |
260 | BUG(); | |
e905a9ed | 261 | |
1da177e4 LT |
262 | nlh->nlmsg_len = skb->tail - old_tail; |
263 | return skb; | |
264 | ||
265 | nlmsg_failure: | |
266 | if (skb) | |
267 | kfree_skb(skb); | |
268 | *errp = -EINVAL; | |
269 | printk(KERN_ERR "ip_queue: error creating packet message\n"); | |
270 | return NULL; | |
271 | } | |
272 | ||
273 | static int | |
0ab43f84 HW |
274 | ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
275 | unsigned int queuenum, void *data) | |
1da177e4 LT |
276 | { |
277 | int status = -EINVAL; | |
278 | struct sk_buff *nskb; | |
279 | struct ipq_queue_entry *entry; | |
280 | ||
281 | if (copy_mode == IPQ_COPY_NONE) | |
282 | return -EAGAIN; | |
283 | ||
284 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
285 | if (entry == NULL) { | |
286 | printk(KERN_ERR "ip_queue: OOM in ipq_enqueue_packet()\n"); | |
287 | return -ENOMEM; | |
288 | } | |
289 | ||
290 | entry->info = info; | |
291 | entry->skb = skb; | |
292 | ||
1da177e4 LT |
293 | nskb = ipq_build_packet_message(entry, &status); |
294 | if (nskb == NULL) | |
295 | goto err_out_free; | |
e905a9ed | 296 | |
1da177e4 | 297 | write_lock_bh(&queue_lock); |
e905a9ed | 298 | |
1da177e4 | 299 | if (!peer_pid) |
e905a9ed | 300 | goto err_out_free_nskb; |
1da177e4 LT |
301 | |
302 | if (queue_total >= queue_maxlen) { | |
e905a9ed | 303 | queue_dropped++; |
1da177e4 LT |
304 | status = -ENOSPC; |
305 | if (net_ratelimit()) | |
e905a9ed | 306 | printk (KERN_WARNING "ip_queue: full at %d entries, " |
1da177e4 LT |
307 | "dropping packets(s). Dropped: %d\n", queue_total, |
308 | queue_dropped); | |
309 | goto err_out_free_nskb; | |
310 | } | |
311 | ||
e905a9ed | 312 | /* netlink_unicast will either free the nskb or attach it to a socket */ |
1da177e4 LT |
313 | status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT); |
314 | if (status < 0) { | |
e905a9ed | 315 | queue_user_dropped++; |
1da177e4 LT |
316 | goto err_out_unlock; |
317 | } | |
318 | ||
319 | __ipq_enqueue_entry(entry); | |
320 | ||
321 | write_unlock_bh(&queue_lock); | |
322 | return status; | |
323 | ||
324 | err_out_free_nskb: | |
e905a9ed YH |
325 | kfree_skb(nskb); |
326 | ||
1da177e4 LT |
327 | err_out_unlock: |
328 | write_unlock_bh(&queue_lock); | |
329 | ||
330 | err_out_free: | |
331 | kfree(entry); | |
332 | return status; | |
333 | } | |
334 | ||
335 | static int | |
336 | ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct ipq_queue_entry *e) | |
337 | { | |
338 | int diff; | |
339 | struct iphdr *user_iph = (struct iphdr *)v->payload; | |
340 | ||
341 | if (v->data_len < sizeof(*user_iph)) | |
342 | return 0; | |
343 | diff = v->data_len - e->skb->len; | |
d8a585d7 PM |
344 | if (diff < 0) { |
345 | if (pskb_trim(e->skb, v->data_len)) | |
346 | return -ENOMEM; | |
347 | } else if (diff > 0) { | |
1da177e4 LT |
348 | if (v->data_len > 0xFFFF) |
349 | return -EINVAL; | |
350 | if (diff > skb_tailroom(e->skb)) { | |
351 | struct sk_buff *newskb; | |
e905a9ed | 352 | |
1da177e4 | 353 | newskb = skb_copy_expand(e->skb, |
e905a9ed YH |
354 | skb_headroom(e->skb), |
355 | diff, | |
356 | GFP_ATOMIC); | |
1da177e4 LT |
357 | if (newskb == NULL) { |
358 | printk(KERN_WARNING "ip_queue: OOM " | |
359 | "in mangle, dropping packet\n"); | |
360 | return -ENOMEM; | |
361 | } | |
362 | if (e->skb->sk) | |
363 | skb_set_owner_w(newskb, e->skb->sk); | |
364 | kfree_skb(e->skb); | |
365 | e->skb = newskb; | |
366 | } | |
367 | skb_put(e->skb, diff); | |
368 | } | |
089af26c | 369 | if (!skb_make_writable(&e->skb, v->data_len)) |
1da177e4 | 370 | return -ENOMEM; |
27d7ff46 | 371 | skb_copy_to_linear_data(e->skb, v->payload, v->data_len); |
66a79a19 | 372 | e->skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 373 | |
1da177e4 LT |
374 | return 0; |
375 | } | |
376 | ||
377 | static inline int | |
378 | id_cmp(struct ipq_queue_entry *e, unsigned long id) | |
379 | { | |
380 | return (id == (unsigned long )e); | |
381 | } | |
382 | ||
383 | static int | |
384 | ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len) | |
385 | { | |
386 | struct ipq_queue_entry *entry; | |
387 | ||
388 | if (vmsg->value > NF_MAX_VERDICT) | |
389 | return -EINVAL; | |
390 | ||
391 | entry = ipq_find_dequeue_entry(id_cmp, vmsg->id); | |
392 | if (entry == NULL) | |
393 | return -ENOENT; | |
394 | else { | |
395 | int verdict = vmsg->value; | |
e905a9ed | 396 | |
1da177e4 LT |
397 | if (vmsg->data_len && vmsg->data_len == len) |
398 | if (ipq_mangle_ipv4(vmsg, entry) < 0) | |
399 | verdict = NF_DROP; | |
e905a9ed | 400 | |
1da177e4 LT |
401 | ipq_issue_verdict(entry, verdict); |
402 | return 0; | |
403 | } | |
404 | } | |
405 | ||
406 | static int | |
407 | ipq_set_mode(unsigned char mode, unsigned int range) | |
408 | { | |
409 | int status; | |
410 | ||
411 | write_lock_bh(&queue_lock); | |
412 | status = __ipq_set_mode(mode, range); | |
413 | write_unlock_bh(&queue_lock); | |
414 | return status; | |
415 | } | |
416 | ||
417 | static int | |
418 | ipq_receive_peer(struct ipq_peer_msg *pmsg, | |
e905a9ed | 419 | unsigned char type, unsigned int len) |
1da177e4 LT |
420 | { |
421 | int status = 0; | |
422 | ||
423 | if (len < sizeof(*pmsg)) | |
424 | return -EINVAL; | |
425 | ||
426 | switch (type) { | |
427 | case IPQM_MODE: | |
428 | status = ipq_set_mode(pmsg->msg.mode.value, | |
e905a9ed | 429 | pmsg->msg.mode.range); |
1da177e4 | 430 | break; |
e905a9ed | 431 | |
1da177e4 LT |
432 | case IPQM_VERDICT: |
433 | if (pmsg->msg.verdict.value > NF_MAX_VERDICT) | |
434 | status = -EINVAL; | |
435 | else | |
436 | status = ipq_set_verdict(&pmsg->msg.verdict, | |
e905a9ed | 437 | len - sizeof(*pmsg)); |
1da177e4 LT |
438 | break; |
439 | default: | |
440 | status = -EINVAL; | |
441 | } | |
442 | return status; | |
443 | } | |
444 | ||
445 | static int | |
446 | dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex) | |
447 | { | |
448 | if (entry->info->indev) | |
449 | if (entry->info->indev->ifindex == ifindex) | |
450 | return 1; | |
1da177e4 LT |
451 | if (entry->info->outdev) |
452 | if (entry->info->outdev->ifindex == ifindex) | |
453 | return 1; | |
ef47c6a7 PM |
454 | #ifdef CONFIG_BRIDGE_NETFILTER |
455 | if (entry->skb->nf_bridge) { | |
456 | if (entry->skb->nf_bridge->physindev && | |
457 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
458 | return 1; | |
459 | if (entry->skb->nf_bridge->physoutdev && | |
460 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
e905a9ed | 461 | return 1; |
ef47c6a7 PM |
462 | } |
463 | #endif | |
1da177e4 LT |
464 | return 0; |
465 | } | |
466 | ||
467 | static void | |
468 | ipq_dev_drop(int ifindex) | |
469 | { | |
470 | struct ipq_queue_entry *entry; | |
e905a9ed | 471 | |
1da177e4 LT |
472 | while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL) |
473 | ipq_issue_verdict(entry, NF_DROP); | |
474 | } | |
475 | ||
476 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
477 | ||
478 | static inline void | |
479 | ipq_rcv_skb(struct sk_buff *skb) | |
480 | { | |
481 | int status, type, pid, flags, nlmsglen, skblen; | |
482 | struct nlmsghdr *nlh; | |
483 | ||
484 | skblen = skb->len; | |
485 | if (skblen < sizeof(*nlh)) | |
486 | return; | |
487 | ||
b529ccf2 | 488 | nlh = nlmsg_hdr(skb); |
1da177e4 LT |
489 | nlmsglen = nlh->nlmsg_len; |
490 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) | |
491 | return; | |
492 | ||
493 | pid = nlh->nlmsg_pid; | |
494 | flags = nlh->nlmsg_flags; | |
e905a9ed | 495 | |
1da177e4 LT |
496 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) |
497 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 498 | |
1da177e4 LT |
499 | if (flags & MSG_TRUNC) |
500 | RCV_SKB_FAIL(-ECOMM); | |
e905a9ed | 501 | |
1da177e4 LT |
502 | type = nlh->nlmsg_type; |
503 | if (type < NLMSG_NOOP || type >= IPQM_MAX) | |
504 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 505 | |
1da177e4 LT |
506 | if (type <= IPQM_BASE) |
507 | return; | |
e905a9ed | 508 | |
c7bdb545 | 509 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
1da177e4 | 510 | RCV_SKB_FAIL(-EPERM); |
e905a9ed | 511 | |
1da177e4 | 512 | write_lock_bh(&queue_lock); |
e905a9ed | 513 | |
1da177e4 LT |
514 | if (peer_pid) { |
515 | if (peer_pid != pid) { | |
516 | write_unlock_bh(&queue_lock); | |
517 | RCV_SKB_FAIL(-EBUSY); | |
518 | } | |
519 | } else { | |
520 | net_enable_timestamp(); | |
521 | peer_pid = pid; | |
522 | } | |
e905a9ed | 523 | |
1da177e4 | 524 | write_unlock_bh(&queue_lock); |
e905a9ed | 525 | |
1da177e4 | 526 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, |
e905a9ed | 527 | nlmsglen - NLMSG_LENGTH(0)); |
1da177e4 LT |
528 | if (status < 0) |
529 | RCV_SKB_FAIL(status); | |
e905a9ed | 530 | |
1da177e4 LT |
531 | if (flags & NLM_F_ACK) |
532 | netlink_ack(skb, nlh, 0); | |
e905a9ed | 533 | return; |
1da177e4 LT |
534 | } |
535 | ||
536 | static void | |
537 | ipq_rcv_sk(struct sock *sk, int len) | |
538 | { | |
2a0a6ebe HX |
539 | struct sk_buff *skb; |
540 | unsigned int qlen; | |
1da177e4 | 541 | |
4a3e2f71 | 542 | mutex_lock(&ipqnl_mutex); |
e905a9ed | 543 | |
2a0a6ebe HX |
544 | for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) { |
545 | skb = skb_dequeue(&sk->sk_receive_queue); | |
546 | ipq_rcv_skb(skb); | |
547 | kfree_skb(skb); | |
548 | } | |
e905a9ed | 549 | |
4a3e2f71 | 550 | mutex_unlock(&ipqnl_mutex); |
1da177e4 LT |
551 | } |
552 | ||
553 | static int | |
554 | ipq_rcv_dev_event(struct notifier_block *this, | |
e905a9ed | 555 | unsigned long event, void *ptr) |
1da177e4 LT |
556 | { |
557 | struct net_device *dev = ptr; | |
558 | ||
559 | /* Drop any packets associated with the downed device */ | |
560 | if (event == NETDEV_DOWN) | |
561 | ipq_dev_drop(dev->ifindex); | |
562 | return NOTIFY_DONE; | |
563 | } | |
564 | ||
565 | static struct notifier_block ipq_dev_notifier = { | |
566 | .notifier_call = ipq_rcv_dev_event, | |
567 | }; | |
568 | ||
569 | static int | |
570 | ipq_rcv_nl_event(struct notifier_block *this, | |
e905a9ed | 571 | unsigned long event, void *ptr) |
1da177e4 LT |
572 | { |
573 | struct netlink_notify *n = ptr; | |
574 | ||
575 | if (event == NETLINK_URELEASE && | |
576 | n->protocol == NETLINK_FIREWALL && n->pid) { | |
577 | write_lock_bh(&queue_lock); | |
578 | if (n->pid == peer_pid) | |
579 | __ipq_reset(); | |
580 | write_unlock_bh(&queue_lock); | |
581 | } | |
582 | return NOTIFY_DONE; | |
583 | } | |
584 | ||
585 | static struct notifier_block ipq_nl_notifier = { | |
586 | .notifier_call = ipq_rcv_nl_event, | |
587 | }; | |
588 | ||
589 | static struct ctl_table_header *ipq_sysctl_header; | |
590 | ||
591 | static ctl_table ipq_table[] = { | |
592 | { | |
593 | .ctl_name = NET_IPQ_QMAX, | |
594 | .procname = NET_IPQ_QMAX_NAME, | |
595 | .data = &queue_maxlen, | |
596 | .maxlen = sizeof(queue_maxlen), | |
597 | .mode = 0644, | |
598 | .proc_handler = proc_dointvec | |
599 | }, | |
e905a9ed | 600 | { .ctl_name = 0 } |
1da177e4 LT |
601 | }; |
602 | ||
603 | static ctl_table ipq_dir_table[] = { | |
604 | { | |
605 | .ctl_name = NET_IPV4, | |
606 | .procname = "ipv4", | |
607 | .mode = 0555, | |
608 | .child = ipq_table | |
609 | }, | |
610 | { .ctl_name = 0 } | |
611 | }; | |
612 | ||
613 | static ctl_table ipq_root_table[] = { | |
614 | { | |
615 | .ctl_name = CTL_NET, | |
616 | .procname = "net", | |
617 | .mode = 0555, | |
618 | .child = ipq_dir_table | |
619 | }, | |
620 | { .ctl_name = 0 } | |
621 | }; | |
622 | ||
623 | #ifdef CONFIG_PROC_FS | |
624 | static int | |
625 | ipq_get_info(char *buffer, char **start, off_t offset, int length) | |
626 | { | |
627 | int len; | |
628 | ||
629 | read_lock_bh(&queue_lock); | |
e905a9ed | 630 | |
1da177e4 | 631 | len = sprintf(buffer, |
e905a9ed YH |
632 | "Peer PID : %d\n" |
633 | "Copy mode : %hu\n" | |
634 | "Copy range : %u\n" | |
635 | "Queue length : %u\n" | |
636 | "Queue max. length : %u\n" | |
1da177e4 LT |
637 | "Queue dropped : %u\n" |
638 | "Netlink dropped : %u\n", | |
e905a9ed YH |
639 | peer_pid, |
640 | copy_mode, | |
641 | copy_range, | |
642 | queue_total, | |
643 | queue_maxlen, | |
1da177e4 LT |
644 | queue_dropped, |
645 | queue_user_dropped); | |
646 | ||
647 | read_unlock_bh(&queue_lock); | |
e905a9ed | 648 | |
1da177e4 LT |
649 | *start = buffer + offset; |
650 | len -= offset; | |
651 | if (len > length) | |
652 | len = length; | |
653 | else if (len < 0) | |
654 | len = 0; | |
655 | return len; | |
656 | } | |
657 | #endif /* CONFIG_PROC_FS */ | |
658 | ||
bbd86b9f HW |
659 | static struct nf_queue_handler nfqh = { |
660 | .name = "ip_queue", | |
661 | .outfn = &ipq_enqueue_packet, | |
662 | }; | |
663 | ||
32292a7f | 664 | static int __init ip_queue_init(void) |
1da177e4 LT |
665 | { |
666 | int status = -ENOMEM; | |
667 | struct proc_dir_entry *proc; | |
e905a9ed | 668 | |
1da177e4 | 669 | netlink_register_notifier(&ipq_nl_notifier); |
06628607 | 670 | ipqnl = netlink_kernel_create(NETLINK_FIREWALL, 0, ipq_rcv_sk, |
af65bdfc | 671 | NULL, THIS_MODULE); |
1da177e4 LT |
672 | if (ipqnl == NULL) { |
673 | printk(KERN_ERR "ip_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 "ip_queue: failed to create proc entry\n"); | |
682 | goto cleanup_ipqnl; | |
683 | } | |
e905a9ed | 684 | |
1da177e4 | 685 | register_netdevice_notifier(&ipq_dev_notifier); |
0b4d4147 | 686 | ipq_sysctl_header = register_sysctl_table(ipq_root_table); |
e905a9ed | 687 | |
bbd86b9f | 688 | status = nf_register_queue_handler(PF_INET, &nfqh); |
1da177e4 LT |
689 | if (status < 0) { |
690 | printk(KERN_ERR "ip_queue: failed to register queue handler\n"); | |
691 | goto cleanup_sysctl; | |
692 | } | |
693 | return status; | |
694 | ||
1da177e4 LT |
695 | cleanup_sysctl: |
696 | unregister_sysctl_table(ipq_sysctl_header); | |
697 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
698 | proc_net_remove(IPQ_PROC_FS_NAME); | |
e905a9ed | 699 | |
1da177e4 LT |
700 | cleanup_ipqnl: |
701 | sock_release(ipqnl->sk_socket); | |
4a3e2f71 AV |
702 | mutex_lock(&ipqnl_mutex); |
703 | mutex_unlock(&ipqnl_mutex); | |
e905a9ed | 704 | |
1da177e4 LT |
705 | cleanup_netlink_notifier: |
706 | netlink_unregister_notifier(&ipq_nl_notifier); | |
707 | return status; | |
708 | } | |
709 | ||
65b4b4e8 | 710 | static void __exit ip_queue_fini(void) |
1da177e4 | 711 | { |
32292a7f PM |
712 | nf_unregister_queue_handlers(&nfqh); |
713 | synchronize_net(); | |
714 | ipq_flush(NF_DROP); | |
715 | ||
716 | unregister_sysctl_table(ipq_sysctl_header); | |
717 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
718 | proc_net_remove(IPQ_PROC_FS_NAME); | |
719 | ||
720 | sock_release(ipqnl->sk_socket); | |
721 | mutex_lock(&ipqnl_mutex); | |
722 | mutex_unlock(&ipqnl_mutex); | |
723 | ||
724 | netlink_unregister_notifier(&ipq_nl_notifier); | |
1da177e4 LT |
725 | } |
726 | ||
727 | MODULE_DESCRIPTION("IPv4 packet queue handler"); | |
728 | MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>"); | |
729 | MODULE_LICENSE("GPL"); | |
730 | ||
65b4b4e8 AM |
731 | module_init(ip_queue_init); |
732 | module_exit(ip_queue_fini); |