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> |
457c4cbc | 27 | #include <net/net_namespace.h> |
1da177e4 LT |
28 | #include <net/sock.h> |
29 | #include <net/route.h> | |
30 | ||
31 | #define IPQ_QMAX_DEFAULT 1024 | |
32 | #define IPQ_PROC_FS_NAME "ip_queue" | |
33 | #define NET_IPQ_QMAX 2088 | |
34 | #define NET_IPQ_QMAX_NAME "ip_queue_maxlen" | |
35 | ||
1da177e4 LT |
36 | struct ipq_queue_entry { |
37 | struct list_head list; | |
38 | struct nf_info *info; | |
39 | struct sk_buff *skb; | |
1da177e4 LT |
40 | }; |
41 | ||
42 | typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long); | |
43 | ||
1192e403 | 44 | static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE; |
94aec08e | 45 | static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT; |
1da177e4 | 46 | static DEFINE_RWLOCK(queue_lock); |
1192e403 BH |
47 | static int peer_pid __read_mostly; |
48 | static unsigned int copy_range __read_mostly; | |
1da177e4 LT |
49 | static unsigned int queue_total; |
50 | static unsigned int queue_dropped = 0; | |
51 | static unsigned int queue_user_dropped = 0; | |
1192e403 | 52 | static struct sock *ipqnl __read_mostly; |
1da177e4 | 53 | static LIST_HEAD(queue_list); |
4a3e2f71 | 54 | static DEFINE_MUTEX(ipqnl_mutex); |
1da177e4 LT |
55 | |
56 | static void | |
57 | ipq_issue_verdict(struct ipq_queue_entry *entry, int verdict) | |
58 | { | |
9bb7bc94 HW |
59 | /* TCP input path (and probably other bits) assume to be called |
60 | * from softirq context, not from syscall, like ipq_issue_verdict is | |
61 | * called. TCP input path deadlocks with locks taken from timer | |
62 | * softirq, e.g. We therefore emulate this by local_bh_disable() */ | |
63 | ||
64 | local_bh_disable(); | |
1da177e4 | 65 | nf_reinject(entry->skb, entry->info, verdict); |
9bb7bc94 HW |
66 | local_bh_enable(); |
67 | ||
1da177e4 LT |
68 | kfree(entry); |
69 | } | |
70 | ||
71 | static inline void | |
72 | __ipq_enqueue_entry(struct ipq_queue_entry *entry) | |
73 | { | |
74 | list_add(&entry->list, &queue_list); | |
75 | queue_total++; | |
76 | } | |
77 | ||
78 | /* | |
79 | * Find and return a queued entry matched by cmpfn, or return the last | |
80 | * entry if cmpfn is NULL. | |
81 | */ | |
82 | static inline struct ipq_queue_entry * | |
83 | __ipq_find_entry(ipq_cmpfn cmpfn, unsigned long data) | |
84 | { | |
85 | struct list_head *p; | |
86 | ||
87 | list_for_each_prev(p, &queue_list) { | |
88 | struct ipq_queue_entry *entry = (struct ipq_queue_entry *)p; | |
e905a9ed | 89 | |
1da177e4 LT |
90 | if (!cmpfn || cmpfn(entry, data)) |
91 | return entry; | |
92 | } | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | static inline void | |
97 | __ipq_dequeue_entry(struct ipq_queue_entry *entry) | |
98 | { | |
99 | list_del(&entry->list); | |
100 | queue_total--; | |
101 | } | |
102 | ||
103 | static inline struct ipq_queue_entry * | |
104 | __ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data) | |
105 | { | |
106 | struct ipq_queue_entry *entry; | |
107 | ||
108 | entry = __ipq_find_entry(cmpfn, data); | |
109 | if (entry == NULL) | |
110 | return NULL; | |
111 | ||
112 | __ipq_dequeue_entry(entry); | |
113 | return entry; | |
114 | } | |
115 | ||
116 | ||
117 | static inline void | |
118 | __ipq_flush(int verdict) | |
119 | { | |
120 | struct ipq_queue_entry *entry; | |
e905a9ed | 121 | |
1da177e4 LT |
122 | while ((entry = __ipq_find_dequeue_entry(NULL, 0))) |
123 | ipq_issue_verdict(entry, verdict); | |
124 | } | |
125 | ||
126 | static inline int | |
127 | __ipq_set_mode(unsigned char mode, unsigned int range) | |
128 | { | |
129 | int status = 0; | |
e905a9ed | 130 | |
1da177e4 LT |
131 | switch(mode) { |
132 | case IPQ_COPY_NONE: | |
133 | case IPQ_COPY_META: | |
134 | copy_mode = mode; | |
135 | copy_range = 0; | |
136 | break; | |
e905a9ed | 137 | |
1da177e4 LT |
138 | case IPQ_COPY_PACKET: |
139 | copy_mode = mode; | |
140 | copy_range = range; | |
141 | if (copy_range > 0xFFFF) | |
142 | copy_range = 0xFFFF; | |
143 | break; | |
e905a9ed | 144 | |
1da177e4 LT |
145 | default: |
146 | status = -EINVAL; | |
147 | ||
148 | } | |
149 | return status; | |
150 | } | |
151 | ||
152 | static inline void | |
153 | __ipq_reset(void) | |
154 | { | |
155 | peer_pid = 0; | |
156 | net_disable_timestamp(); | |
157 | __ipq_set_mode(IPQ_COPY_NONE, 0); | |
158 | __ipq_flush(NF_DROP); | |
159 | } | |
160 | ||
161 | static struct ipq_queue_entry * | |
162 | ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data) | |
163 | { | |
164 | struct ipq_queue_entry *entry; | |
e905a9ed | 165 | |
1da177e4 LT |
166 | write_lock_bh(&queue_lock); |
167 | entry = __ipq_find_dequeue_entry(cmpfn, data); | |
168 | write_unlock_bh(&queue_lock); | |
169 | return entry; | |
170 | } | |
171 | ||
172 | static void | |
173 | ipq_flush(int verdict) | |
174 | { | |
175 | write_lock_bh(&queue_lock); | |
176 | __ipq_flush(verdict); | |
177 | write_unlock_bh(&queue_lock); | |
178 | } | |
179 | ||
180 | static struct sk_buff * | |
181 | ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp) | |
182 | { | |
27a884dc | 183 | sk_buff_data_t old_tail; |
1da177e4 LT |
184 | size_t size = 0; |
185 | size_t data_len = 0; | |
186 | struct sk_buff *skb; | |
187 | struct ipq_packet_msg *pmsg; | |
188 | struct nlmsghdr *nlh; | |
b7aa0bf7 | 189 | struct timeval tv; |
1da177e4 LT |
190 | |
191 | read_lock_bh(&queue_lock); | |
e905a9ed | 192 | |
1da177e4 LT |
193 | switch (copy_mode) { |
194 | case IPQ_COPY_META: | |
195 | case IPQ_COPY_NONE: | |
196 | size = NLMSG_SPACE(sizeof(*pmsg)); | |
197 | data_len = 0; | |
198 | break; | |
e905a9ed | 199 | |
1da177e4 | 200 | case IPQ_COPY_PACKET: |
84fa7933 PM |
201 | if ((entry->skb->ip_summed == CHECKSUM_PARTIAL || |
202 | entry->skb->ip_summed == CHECKSUM_COMPLETE) && | |
203 | (*errp = skb_checksum_help(entry->skb))) { | |
66a79a19 PM |
204 | read_unlock_bh(&queue_lock); |
205 | return NULL; | |
206 | } | |
1da177e4 LT |
207 | if (copy_range == 0 || copy_range > entry->skb->len) |
208 | data_len = entry->skb->len; | |
209 | else | |
210 | data_len = copy_range; | |
e905a9ed | 211 | |
1da177e4 LT |
212 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); |
213 | break; | |
e905a9ed | 214 | |
1da177e4 LT |
215 | default: |
216 | *errp = -EINVAL; | |
217 | read_unlock_bh(&queue_lock); | |
218 | return NULL; | |
219 | } | |
220 | ||
221 | read_unlock_bh(&queue_lock); | |
222 | ||
223 | skb = alloc_skb(size, GFP_ATOMIC); | |
224 | if (!skb) | |
225 | goto nlmsg_failure; | |
e905a9ed | 226 | |
27a884dc | 227 | old_tail = skb->tail; |
1da177e4 LT |
228 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); |
229 | pmsg = NLMSG_DATA(nlh); | |
230 | memset(pmsg, 0, sizeof(*pmsg)); | |
231 | ||
232 | pmsg->packet_id = (unsigned long )entry; | |
233 | pmsg->data_len = data_len; | |
b7aa0bf7 ED |
234 | tv = ktime_to_timeval(entry->skb->tstamp); |
235 | pmsg->timestamp_sec = tv.tv_sec; | |
236 | pmsg->timestamp_usec = tv.tv_usec; | |
82e91ffe | 237 | pmsg->mark = entry->skb->mark; |
1da177e4 LT |
238 | pmsg->hook = entry->info->hook; |
239 | pmsg->hw_protocol = entry->skb->protocol; | |
e905a9ed | 240 | |
1da177e4 LT |
241 | if (entry->info->indev) |
242 | strcpy(pmsg->indev_name, entry->info->indev->name); | |
243 | else | |
244 | pmsg->indev_name[0] = '\0'; | |
e905a9ed | 245 | |
1da177e4 LT |
246 | if (entry->info->outdev) |
247 | strcpy(pmsg->outdev_name, entry->info->outdev->name); | |
248 | else | |
249 | pmsg->outdev_name[0] = '\0'; | |
e905a9ed | 250 | |
1da177e4 LT |
251 | if (entry->info->indev && entry->skb->dev) { |
252 | pmsg->hw_type = entry->skb->dev->type; | |
253 | if (entry->skb->dev->hard_header_parse) | |
254 | pmsg->hw_addrlen = | |
255 | entry->skb->dev->hard_header_parse(entry->skb, | |
e905a9ed | 256 | pmsg->hw_addr); |
1da177e4 | 257 | } |
e905a9ed | 258 | |
1da177e4 LT |
259 | if (data_len) |
260 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) | |
261 | BUG(); | |
e905a9ed | 262 | |
1da177e4 LT |
263 | nlh->nlmsg_len = skb->tail - old_tail; |
264 | return skb; | |
265 | ||
266 | nlmsg_failure: | |
267 | if (skb) | |
268 | kfree_skb(skb); | |
269 | *errp = -EINVAL; | |
270 | printk(KERN_ERR "ip_queue: error creating packet message\n"); | |
271 | return NULL; | |
272 | } | |
273 | ||
274 | static int | |
0ab43f84 HW |
275 | ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
276 | unsigned int queuenum, void *data) | |
1da177e4 LT |
277 | { |
278 | int status = -EINVAL; | |
279 | struct sk_buff *nskb; | |
280 | struct ipq_queue_entry *entry; | |
281 | ||
282 | if (copy_mode == IPQ_COPY_NONE) | |
283 | return -EAGAIN; | |
284 | ||
285 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
286 | if (entry == NULL) { | |
287 | printk(KERN_ERR "ip_queue: OOM in ipq_enqueue_packet()\n"); | |
288 | return -ENOMEM; | |
289 | } | |
290 | ||
291 | entry->info = info; | |
292 | entry->skb = skb; | |
293 | ||
1da177e4 LT |
294 | nskb = ipq_build_packet_message(entry, &status); |
295 | if (nskb == NULL) | |
296 | goto err_out_free; | |
e905a9ed | 297 | |
1da177e4 | 298 | write_lock_bh(&queue_lock); |
e905a9ed | 299 | |
1da177e4 | 300 | if (!peer_pid) |
e905a9ed | 301 | goto err_out_free_nskb; |
1da177e4 LT |
302 | |
303 | if (queue_total >= queue_maxlen) { | |
e905a9ed | 304 | queue_dropped++; |
1da177e4 LT |
305 | status = -ENOSPC; |
306 | if (net_ratelimit()) | |
e905a9ed | 307 | printk (KERN_WARNING "ip_queue: full at %d entries, " |
1da177e4 LT |
308 | "dropping packets(s). Dropped: %d\n", queue_total, |
309 | queue_dropped); | |
310 | goto err_out_free_nskb; | |
311 | } | |
312 | ||
e905a9ed | 313 | /* netlink_unicast will either free the nskb or attach it to a socket */ |
1da177e4 LT |
314 | status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT); |
315 | if (status < 0) { | |
e905a9ed | 316 | queue_user_dropped++; |
1da177e4 LT |
317 | goto err_out_unlock; |
318 | } | |
319 | ||
320 | __ipq_enqueue_entry(entry); | |
321 | ||
322 | write_unlock_bh(&queue_lock); | |
323 | return status; | |
324 | ||
325 | err_out_free_nskb: | |
e905a9ed YH |
326 | kfree_skb(nskb); |
327 | ||
1da177e4 LT |
328 | err_out_unlock: |
329 | write_unlock_bh(&queue_lock); | |
330 | ||
331 | err_out_free: | |
332 | kfree(entry); | |
333 | return status; | |
334 | } | |
335 | ||
336 | static int | |
337 | ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct ipq_queue_entry *e) | |
338 | { | |
339 | int diff; | |
340 | struct iphdr *user_iph = (struct iphdr *)v->payload; | |
341 | ||
342 | if (v->data_len < sizeof(*user_iph)) | |
343 | return 0; | |
344 | diff = v->data_len - e->skb->len; | |
d8a585d7 PM |
345 | if (diff < 0) { |
346 | if (pskb_trim(e->skb, v->data_len)) | |
347 | return -ENOMEM; | |
348 | } else if (diff > 0) { | |
1da177e4 LT |
349 | if (v->data_len > 0xFFFF) |
350 | return -EINVAL; | |
351 | if (diff > skb_tailroom(e->skb)) { | |
352 | struct sk_buff *newskb; | |
e905a9ed | 353 | |
1da177e4 | 354 | newskb = skb_copy_expand(e->skb, |
e905a9ed YH |
355 | skb_headroom(e->skb), |
356 | diff, | |
357 | GFP_ATOMIC); | |
1da177e4 LT |
358 | if (newskb == NULL) { |
359 | printk(KERN_WARNING "ip_queue: OOM " | |
360 | "in mangle, dropping packet\n"); | |
361 | return -ENOMEM; | |
362 | } | |
363 | if (e->skb->sk) | |
364 | skb_set_owner_w(newskb, e->skb->sk); | |
365 | kfree_skb(e->skb); | |
366 | e->skb = newskb; | |
367 | } | |
368 | skb_put(e->skb, diff); | |
369 | } | |
089af26c | 370 | if (!skb_make_writable(&e->skb, v->data_len)) |
1da177e4 | 371 | return -ENOMEM; |
27d7ff46 | 372 | skb_copy_to_linear_data(e->skb, v->payload, v->data_len); |
66a79a19 | 373 | e->skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 374 | |
1da177e4 LT |
375 | return 0; |
376 | } | |
377 | ||
378 | static inline int | |
379 | id_cmp(struct ipq_queue_entry *e, unsigned long id) | |
380 | { | |
381 | return (id == (unsigned long )e); | |
382 | } | |
383 | ||
384 | static int | |
385 | ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len) | |
386 | { | |
387 | struct ipq_queue_entry *entry; | |
388 | ||
389 | if (vmsg->value > NF_MAX_VERDICT) | |
390 | return -EINVAL; | |
391 | ||
392 | entry = ipq_find_dequeue_entry(id_cmp, vmsg->id); | |
393 | if (entry == NULL) | |
394 | return -ENOENT; | |
395 | else { | |
396 | int verdict = vmsg->value; | |
e905a9ed | 397 | |
1da177e4 LT |
398 | if (vmsg->data_len && vmsg->data_len == len) |
399 | if (ipq_mangle_ipv4(vmsg, entry) < 0) | |
400 | verdict = NF_DROP; | |
e905a9ed | 401 | |
1da177e4 LT |
402 | ipq_issue_verdict(entry, verdict); |
403 | return 0; | |
404 | } | |
405 | } | |
406 | ||
407 | static int | |
408 | ipq_set_mode(unsigned char mode, unsigned int range) | |
409 | { | |
410 | int status; | |
411 | ||
412 | write_lock_bh(&queue_lock); | |
413 | status = __ipq_set_mode(mode, range); | |
414 | write_unlock_bh(&queue_lock); | |
415 | return status; | |
416 | } | |
417 | ||
418 | static int | |
419 | ipq_receive_peer(struct ipq_peer_msg *pmsg, | |
e905a9ed | 420 | unsigned char type, unsigned int len) |
1da177e4 LT |
421 | { |
422 | int status = 0; | |
423 | ||
424 | if (len < sizeof(*pmsg)) | |
425 | return -EINVAL; | |
426 | ||
427 | switch (type) { | |
428 | case IPQM_MODE: | |
429 | status = ipq_set_mode(pmsg->msg.mode.value, | |
e905a9ed | 430 | pmsg->msg.mode.range); |
1da177e4 | 431 | break; |
e905a9ed | 432 | |
1da177e4 LT |
433 | case IPQM_VERDICT: |
434 | if (pmsg->msg.verdict.value > NF_MAX_VERDICT) | |
435 | status = -EINVAL; | |
436 | else | |
437 | status = ipq_set_verdict(&pmsg->msg.verdict, | |
e905a9ed | 438 | len - sizeof(*pmsg)); |
1da177e4 LT |
439 | break; |
440 | default: | |
441 | status = -EINVAL; | |
442 | } | |
443 | return status; | |
444 | } | |
445 | ||
446 | static int | |
447 | dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex) | |
448 | { | |
449 | if (entry->info->indev) | |
450 | if (entry->info->indev->ifindex == ifindex) | |
451 | return 1; | |
1da177e4 LT |
452 | if (entry->info->outdev) |
453 | if (entry->info->outdev->ifindex == ifindex) | |
454 | return 1; | |
ef47c6a7 PM |
455 | #ifdef CONFIG_BRIDGE_NETFILTER |
456 | if (entry->skb->nf_bridge) { | |
457 | if (entry->skb->nf_bridge->physindev && | |
458 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
459 | return 1; | |
460 | if (entry->skb->nf_bridge->physoutdev && | |
461 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
e905a9ed | 462 | return 1; |
ef47c6a7 PM |
463 | } |
464 | #endif | |
1da177e4 LT |
465 | return 0; |
466 | } | |
467 | ||
468 | static void | |
469 | ipq_dev_drop(int ifindex) | |
470 | { | |
471 | struct ipq_queue_entry *entry; | |
e905a9ed | 472 | |
1da177e4 LT |
473 | while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL) |
474 | ipq_issue_verdict(entry, NF_DROP); | |
475 | } | |
476 | ||
477 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
478 | ||
479 | static inline void | |
480 | ipq_rcv_skb(struct sk_buff *skb) | |
481 | { | |
482 | int status, type, pid, flags, nlmsglen, skblen; | |
483 | struct nlmsghdr *nlh; | |
484 | ||
485 | skblen = skb->len; | |
486 | if (skblen < sizeof(*nlh)) | |
487 | return; | |
488 | ||
b529ccf2 | 489 | nlh = nlmsg_hdr(skb); |
1da177e4 LT |
490 | nlmsglen = nlh->nlmsg_len; |
491 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) | |
492 | return; | |
493 | ||
494 | pid = nlh->nlmsg_pid; | |
495 | flags = nlh->nlmsg_flags; | |
e905a9ed | 496 | |
1da177e4 LT |
497 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) |
498 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 499 | |
1da177e4 LT |
500 | if (flags & MSG_TRUNC) |
501 | RCV_SKB_FAIL(-ECOMM); | |
e905a9ed | 502 | |
1da177e4 LT |
503 | type = nlh->nlmsg_type; |
504 | if (type < NLMSG_NOOP || type >= IPQM_MAX) | |
505 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 506 | |
1da177e4 LT |
507 | if (type <= IPQM_BASE) |
508 | return; | |
e905a9ed | 509 | |
c7bdb545 | 510 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
1da177e4 | 511 | RCV_SKB_FAIL(-EPERM); |
e905a9ed | 512 | |
1da177e4 | 513 | write_lock_bh(&queue_lock); |
e905a9ed | 514 | |
1da177e4 LT |
515 | if (peer_pid) { |
516 | if (peer_pid != pid) { | |
517 | write_unlock_bh(&queue_lock); | |
518 | RCV_SKB_FAIL(-EBUSY); | |
519 | } | |
520 | } else { | |
521 | net_enable_timestamp(); | |
522 | peer_pid = pid; | |
523 | } | |
e905a9ed | 524 | |
1da177e4 | 525 | write_unlock_bh(&queue_lock); |
e905a9ed | 526 | |
1da177e4 | 527 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, |
e905a9ed | 528 | nlmsglen - NLMSG_LENGTH(0)); |
1da177e4 LT |
529 | if (status < 0) |
530 | RCV_SKB_FAIL(status); | |
e905a9ed | 531 | |
1da177e4 LT |
532 | if (flags & NLM_F_ACK) |
533 | netlink_ack(skb, nlh, 0); | |
e905a9ed | 534 | return; |
1da177e4 LT |
535 | } |
536 | ||
537 | static void | |
538 | ipq_rcv_sk(struct sock *sk, int len) | |
539 | { | |
2a0a6ebe HX |
540 | struct sk_buff *skb; |
541 | unsigned int qlen; | |
1da177e4 | 542 | |
4a3e2f71 | 543 | mutex_lock(&ipqnl_mutex); |
e905a9ed | 544 | |
2a0a6ebe HX |
545 | for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) { |
546 | skb = skb_dequeue(&sk->sk_receive_queue); | |
547 | ipq_rcv_skb(skb); | |
548 | kfree_skb(skb); | |
549 | } | |
e905a9ed | 550 | |
4a3e2f71 | 551 | mutex_unlock(&ipqnl_mutex); |
1da177e4 LT |
552 | } |
553 | ||
554 | static int | |
555 | ipq_rcv_dev_event(struct notifier_block *this, | |
e905a9ed | 556 | unsigned long event, void *ptr) |
1da177e4 LT |
557 | { |
558 | struct net_device *dev = ptr; | |
559 | ||
560 | /* Drop any packets associated with the downed device */ | |
561 | if (event == NETDEV_DOWN) | |
562 | ipq_dev_drop(dev->ifindex); | |
563 | return NOTIFY_DONE; | |
564 | } | |
565 | ||
566 | static struct notifier_block ipq_dev_notifier = { | |
567 | .notifier_call = ipq_rcv_dev_event, | |
568 | }; | |
569 | ||
570 | static int | |
571 | ipq_rcv_nl_event(struct notifier_block *this, | |
e905a9ed | 572 | unsigned long event, void *ptr) |
1da177e4 LT |
573 | { |
574 | struct netlink_notify *n = ptr; | |
575 | ||
576 | if (event == NETLINK_URELEASE && | |
577 | n->protocol == NETLINK_FIREWALL && n->pid) { | |
578 | write_lock_bh(&queue_lock); | |
579 | if (n->pid == peer_pid) | |
580 | __ipq_reset(); | |
581 | write_unlock_bh(&queue_lock); | |
582 | } | |
583 | return NOTIFY_DONE; | |
584 | } | |
585 | ||
586 | static struct notifier_block ipq_nl_notifier = { | |
587 | .notifier_call = ipq_rcv_nl_event, | |
588 | }; | |
589 | ||
590 | static struct ctl_table_header *ipq_sysctl_header; | |
591 | ||
592 | static ctl_table ipq_table[] = { | |
593 | { | |
594 | .ctl_name = NET_IPQ_QMAX, | |
595 | .procname = NET_IPQ_QMAX_NAME, | |
596 | .data = &queue_maxlen, | |
597 | .maxlen = sizeof(queue_maxlen), | |
598 | .mode = 0644, | |
599 | .proc_handler = proc_dointvec | |
600 | }, | |
e905a9ed | 601 | { .ctl_name = 0 } |
1da177e4 LT |
602 | }; |
603 | ||
604 | static ctl_table ipq_dir_table[] = { | |
605 | { | |
606 | .ctl_name = NET_IPV4, | |
607 | .procname = "ipv4", | |
608 | .mode = 0555, | |
609 | .child = ipq_table | |
610 | }, | |
611 | { .ctl_name = 0 } | |
612 | }; | |
613 | ||
614 | static ctl_table ipq_root_table[] = { | |
615 | { | |
616 | .ctl_name = CTL_NET, | |
617 | .procname = "net", | |
618 | .mode = 0555, | |
619 | .child = ipq_dir_table | |
620 | }, | |
621 | { .ctl_name = 0 } | |
622 | }; | |
623 | ||
624 | #ifdef CONFIG_PROC_FS | |
625 | static int | |
626 | ipq_get_info(char *buffer, char **start, off_t offset, int length) | |
627 | { | |
628 | int len; | |
629 | ||
630 | read_lock_bh(&queue_lock); | |
e905a9ed | 631 | |
1da177e4 | 632 | len = sprintf(buffer, |
e905a9ed YH |
633 | "Peer PID : %d\n" |
634 | "Copy mode : %hu\n" | |
635 | "Copy range : %u\n" | |
636 | "Queue length : %u\n" | |
637 | "Queue max. length : %u\n" | |
1da177e4 LT |
638 | "Queue dropped : %u\n" |
639 | "Netlink dropped : %u\n", | |
e905a9ed YH |
640 | peer_pid, |
641 | copy_mode, | |
642 | copy_range, | |
643 | queue_total, | |
644 | queue_maxlen, | |
1da177e4 LT |
645 | queue_dropped, |
646 | queue_user_dropped); | |
647 | ||
648 | read_unlock_bh(&queue_lock); | |
e905a9ed | 649 | |
1da177e4 LT |
650 | *start = buffer + offset; |
651 | len -= offset; | |
652 | if (len > length) | |
653 | len = length; | |
654 | else if (len < 0) | |
655 | len = 0; | |
656 | return len; | |
657 | } | |
658 | #endif /* CONFIG_PROC_FS */ | |
659 | ||
bbd86b9f HW |
660 | static struct nf_queue_handler nfqh = { |
661 | .name = "ip_queue", | |
662 | .outfn = &ipq_enqueue_packet, | |
663 | }; | |
664 | ||
32292a7f | 665 | static int __init ip_queue_init(void) |
1da177e4 LT |
666 | { |
667 | int status = -ENOMEM; | |
668 | struct proc_dir_entry *proc; | |
e905a9ed | 669 | |
1da177e4 | 670 | netlink_register_notifier(&ipq_nl_notifier); |
06628607 | 671 | ipqnl = netlink_kernel_create(NETLINK_FIREWALL, 0, ipq_rcv_sk, |
af65bdfc | 672 | NULL, THIS_MODULE); |
1da177e4 LT |
673 | if (ipqnl == NULL) { |
674 | printk(KERN_ERR "ip_queue: failed to create netlink socket\n"); | |
675 | goto cleanup_netlink_notifier; | |
676 | } | |
677 | ||
457c4cbc | 678 | proc = proc_net_create(&init_net, IPQ_PROC_FS_NAME, 0, ipq_get_info); |
1da177e4 LT |
679 | if (proc) |
680 | proc->owner = THIS_MODULE; | |
681 | else { | |
682 | printk(KERN_ERR "ip_queue: failed to create proc entry\n"); | |
683 | goto cleanup_ipqnl; | |
684 | } | |
e905a9ed | 685 | |
1da177e4 | 686 | register_netdevice_notifier(&ipq_dev_notifier); |
0b4d4147 | 687 | ipq_sysctl_header = register_sysctl_table(ipq_root_table); |
e905a9ed | 688 | |
bbd86b9f | 689 | status = nf_register_queue_handler(PF_INET, &nfqh); |
1da177e4 LT |
690 | if (status < 0) { |
691 | printk(KERN_ERR "ip_queue: failed to register queue handler\n"); | |
692 | goto cleanup_sysctl; | |
693 | } | |
694 | return status; | |
695 | ||
1da177e4 LT |
696 | cleanup_sysctl: |
697 | unregister_sysctl_table(ipq_sysctl_header); | |
698 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
457c4cbc | 699 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
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); | |
457c4cbc | 718 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
32292a7f PM |
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); |