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Commit | Line | Data |
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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). | |
e905a9ed | 14 | * 2000-06-19: Fixed so nfmark is copied to metadata (reported by Sebastian |
1da177e4 LT |
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 | |
e905a9ed YH |
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 | ||
1192e403 | 55 | static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE; |
94aec08e | 56 | static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT; |
1da177e4 | 57 | static DEFINE_RWLOCK(queue_lock); |
1192e403 BH |
58 | static int peer_pid __read_mostly; |
59 | static unsigned int copy_range __read_mostly; | |
1da177e4 LT |
60 | static unsigned int queue_total; |
61 | static unsigned int queue_dropped = 0; | |
62 | static unsigned int queue_user_dropped = 0; | |
1192e403 | 63 | static struct sock *ipqnl __read_mostly; |
1da177e4 | 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; | |
e905a9ed | 100 | |
1da177e4 LT |
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; | |
e905a9ed | 132 | |
1da177e4 LT |
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; | |
e905a9ed | 141 | |
1da177e4 LT |
142 | switch(mode) { |
143 | case IPQ_COPY_NONE: | |
144 | case IPQ_COPY_META: | |
145 | copy_mode = mode; | |
146 | copy_range = 0; | |
147 | break; | |
e905a9ed | 148 | |
1da177e4 LT |
149 | case IPQ_COPY_PACKET: |
150 | copy_mode = mode; | |
151 | copy_range = range; | |
152 | if (copy_range > 0xFFFF) | |
153 | copy_range = 0xFFFF; | |
154 | break; | |
e905a9ed | 155 | |
1da177e4 LT |
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; | |
e905a9ed | 176 | |
1da177e4 LT |
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 | { | |
27a884dc | 194 | sk_buff_data_t old_tail; |
1da177e4 LT |
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; | |
b7aa0bf7 | 200 | struct timeval tv; |
1da177e4 LT |
201 | |
202 | read_lock_bh(&queue_lock); | |
e905a9ed | 203 | |
1da177e4 LT |
204 | switch (copy_mode) { |
205 | case IPQ_COPY_META: | |
206 | case IPQ_COPY_NONE: | |
207 | size = NLMSG_SPACE(sizeof(*pmsg)); | |
208 | data_len = 0; | |
209 | break; | |
e905a9ed | 210 | |
1da177e4 | 211 | case IPQ_COPY_PACKET: |
84fa7933 PM |
212 | if ((entry->skb->ip_summed == CHECKSUM_PARTIAL || |
213 | entry->skb->ip_summed == CHECKSUM_COMPLETE) && | |
214 | (*errp = skb_checksum_help(entry->skb))) { | |
66a79a19 PM |
215 | read_unlock_bh(&queue_lock); |
216 | return NULL; | |
217 | } | |
1da177e4 LT |
218 | if (copy_range == 0 || copy_range > entry->skb->len) |
219 | data_len = entry->skb->len; | |
220 | else | |
221 | data_len = copy_range; | |
e905a9ed | 222 | |
1da177e4 LT |
223 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); |
224 | break; | |
e905a9ed | 225 | |
1da177e4 LT |
226 | default: |
227 | *errp = -EINVAL; | |
228 | read_unlock_bh(&queue_lock); | |
229 | return NULL; | |
230 | } | |
231 | ||
232 | read_unlock_bh(&queue_lock); | |
233 | ||
234 | skb = alloc_skb(size, GFP_ATOMIC); | |
235 | if (!skb) | |
236 | goto nlmsg_failure; | |
e905a9ed | 237 | |
27a884dc | 238 | old_tail = skb->tail; |
1da177e4 LT |
239 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); |
240 | pmsg = NLMSG_DATA(nlh); | |
241 | memset(pmsg, 0, sizeof(*pmsg)); | |
242 | ||
243 | pmsg->packet_id = (unsigned long )entry; | |
244 | pmsg->data_len = data_len; | |
b7aa0bf7 ED |
245 | tv = ktime_to_timeval(entry->skb->tstamp); |
246 | pmsg->timestamp_sec = tv.tv_sec; | |
247 | pmsg->timestamp_usec = tv.tv_usec; | |
82e91ffe | 248 | pmsg->mark = entry->skb->mark; |
1da177e4 LT |
249 | pmsg->hook = entry->info->hook; |
250 | pmsg->hw_protocol = entry->skb->protocol; | |
e905a9ed | 251 | |
1da177e4 LT |
252 | if (entry->info->indev) |
253 | strcpy(pmsg->indev_name, entry->info->indev->name); | |
254 | else | |
255 | pmsg->indev_name[0] = '\0'; | |
e905a9ed | 256 | |
1da177e4 LT |
257 | if (entry->info->outdev) |
258 | strcpy(pmsg->outdev_name, entry->info->outdev->name); | |
259 | else | |
260 | pmsg->outdev_name[0] = '\0'; | |
e905a9ed | 261 | |
1da177e4 LT |
262 | if (entry->info->indev && entry->skb->dev) { |
263 | pmsg->hw_type = entry->skb->dev->type; | |
264 | if (entry->skb->dev->hard_header_parse) | |
265 | pmsg->hw_addrlen = | |
266 | entry->skb->dev->hard_header_parse(entry->skb, | |
e905a9ed | 267 | pmsg->hw_addr); |
1da177e4 | 268 | } |
e905a9ed | 269 | |
1da177e4 LT |
270 | if (data_len) |
271 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) | |
272 | BUG(); | |
e905a9ed | 273 | |
1da177e4 LT |
274 | nlh->nlmsg_len = skb->tail - old_tail; |
275 | return skb; | |
276 | ||
277 | nlmsg_failure: | |
278 | if (skb) | |
279 | kfree_skb(skb); | |
280 | *errp = -EINVAL; | |
281 | printk(KERN_ERR "ip_queue: error creating packet message\n"); | |
282 | return NULL; | |
283 | } | |
284 | ||
285 | static int | |
0ab43f84 HW |
286 | ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
287 | unsigned int queuenum, void *data) | |
1da177e4 LT |
288 | { |
289 | int status = -EINVAL; | |
290 | struct sk_buff *nskb; | |
291 | struct ipq_queue_entry *entry; | |
292 | ||
293 | if (copy_mode == IPQ_COPY_NONE) | |
294 | return -EAGAIN; | |
295 | ||
296 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
297 | if (entry == NULL) { | |
298 | printk(KERN_ERR "ip_queue: OOM in ipq_enqueue_packet()\n"); | |
299 | return -ENOMEM; | |
300 | } | |
301 | ||
302 | entry->info = info; | |
303 | entry->skb = skb; | |
304 | ||
1da177e4 LT |
305 | nskb = ipq_build_packet_message(entry, &status); |
306 | if (nskb == NULL) | |
307 | goto err_out_free; | |
e905a9ed | 308 | |
1da177e4 | 309 | write_lock_bh(&queue_lock); |
e905a9ed | 310 | |
1da177e4 | 311 | if (!peer_pid) |
e905a9ed | 312 | goto err_out_free_nskb; |
1da177e4 LT |
313 | |
314 | if (queue_total >= queue_maxlen) { | |
e905a9ed | 315 | queue_dropped++; |
1da177e4 LT |
316 | status = -ENOSPC; |
317 | if (net_ratelimit()) | |
e905a9ed | 318 | printk (KERN_WARNING "ip_queue: full at %d entries, " |
1da177e4 LT |
319 | "dropping packets(s). Dropped: %d\n", queue_total, |
320 | queue_dropped); | |
321 | goto err_out_free_nskb; | |
322 | } | |
323 | ||
e905a9ed | 324 | /* netlink_unicast will either free the nskb or attach it to a socket */ |
1da177e4 LT |
325 | status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT); |
326 | if (status < 0) { | |
e905a9ed | 327 | queue_user_dropped++; |
1da177e4 LT |
328 | goto err_out_unlock; |
329 | } | |
330 | ||
331 | __ipq_enqueue_entry(entry); | |
332 | ||
333 | write_unlock_bh(&queue_lock); | |
334 | return status; | |
335 | ||
336 | err_out_free_nskb: | |
e905a9ed YH |
337 | kfree_skb(nskb); |
338 | ||
1da177e4 LT |
339 | err_out_unlock: |
340 | write_unlock_bh(&queue_lock); | |
341 | ||
342 | err_out_free: | |
343 | kfree(entry); | |
344 | return status; | |
345 | } | |
346 | ||
347 | static int | |
348 | ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct ipq_queue_entry *e) | |
349 | { | |
350 | int diff; | |
351 | struct iphdr *user_iph = (struct iphdr *)v->payload; | |
352 | ||
353 | if (v->data_len < sizeof(*user_iph)) | |
354 | return 0; | |
355 | diff = v->data_len - e->skb->len; | |
d8a585d7 PM |
356 | if (diff < 0) { |
357 | if (pskb_trim(e->skb, v->data_len)) | |
358 | return -ENOMEM; | |
359 | } else if (diff > 0) { | |
1da177e4 LT |
360 | if (v->data_len > 0xFFFF) |
361 | return -EINVAL; | |
362 | if (diff > skb_tailroom(e->skb)) { | |
363 | struct sk_buff *newskb; | |
e905a9ed | 364 | |
1da177e4 | 365 | newskb = skb_copy_expand(e->skb, |
e905a9ed YH |
366 | skb_headroom(e->skb), |
367 | diff, | |
368 | GFP_ATOMIC); | |
1da177e4 LT |
369 | if (newskb == NULL) { |
370 | printk(KERN_WARNING "ip_queue: OOM " | |
371 | "in mangle, dropping packet\n"); | |
372 | return -ENOMEM; | |
373 | } | |
374 | if (e->skb->sk) | |
375 | skb_set_owner_w(newskb, e->skb->sk); | |
376 | kfree_skb(e->skb); | |
377 | e->skb = newskb; | |
378 | } | |
379 | skb_put(e->skb, diff); | |
380 | } | |
089af26c | 381 | if (!skb_make_writable(&e->skb, v->data_len)) |
1da177e4 LT |
382 | return -ENOMEM; |
383 | memcpy(e->skb->data, v->payload, v->data_len); | |
66a79a19 | 384 | e->skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 385 | |
1da177e4 LT |
386 | return 0; |
387 | } | |
388 | ||
389 | static inline int | |
390 | id_cmp(struct ipq_queue_entry *e, unsigned long id) | |
391 | { | |
392 | return (id == (unsigned long )e); | |
393 | } | |
394 | ||
395 | static int | |
396 | ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len) | |
397 | { | |
398 | struct ipq_queue_entry *entry; | |
399 | ||
400 | if (vmsg->value > NF_MAX_VERDICT) | |
401 | return -EINVAL; | |
402 | ||
403 | entry = ipq_find_dequeue_entry(id_cmp, vmsg->id); | |
404 | if (entry == NULL) | |
405 | return -ENOENT; | |
406 | else { | |
407 | int verdict = vmsg->value; | |
e905a9ed | 408 | |
1da177e4 LT |
409 | if (vmsg->data_len && vmsg->data_len == len) |
410 | if (ipq_mangle_ipv4(vmsg, entry) < 0) | |
411 | verdict = NF_DROP; | |
e905a9ed | 412 | |
1da177e4 LT |
413 | ipq_issue_verdict(entry, verdict); |
414 | return 0; | |
415 | } | |
416 | } | |
417 | ||
418 | static int | |
419 | ipq_set_mode(unsigned char mode, unsigned int range) | |
420 | { | |
421 | int status; | |
422 | ||
423 | write_lock_bh(&queue_lock); | |
424 | status = __ipq_set_mode(mode, range); | |
425 | write_unlock_bh(&queue_lock); | |
426 | return status; | |
427 | } | |
428 | ||
429 | static int | |
430 | ipq_receive_peer(struct ipq_peer_msg *pmsg, | |
e905a9ed | 431 | unsigned char type, unsigned int len) |
1da177e4 LT |
432 | { |
433 | int status = 0; | |
434 | ||
435 | if (len < sizeof(*pmsg)) | |
436 | return -EINVAL; | |
437 | ||
438 | switch (type) { | |
439 | case IPQM_MODE: | |
440 | status = ipq_set_mode(pmsg->msg.mode.value, | |
e905a9ed | 441 | pmsg->msg.mode.range); |
1da177e4 | 442 | break; |
e905a9ed | 443 | |
1da177e4 LT |
444 | case IPQM_VERDICT: |
445 | if (pmsg->msg.verdict.value > NF_MAX_VERDICT) | |
446 | status = -EINVAL; | |
447 | else | |
448 | status = ipq_set_verdict(&pmsg->msg.verdict, | |
e905a9ed | 449 | len - sizeof(*pmsg)); |
1da177e4 LT |
450 | break; |
451 | default: | |
452 | status = -EINVAL; | |
453 | } | |
454 | return status; | |
455 | } | |
456 | ||
457 | static int | |
458 | dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex) | |
459 | { | |
460 | if (entry->info->indev) | |
461 | if (entry->info->indev->ifindex == ifindex) | |
462 | return 1; | |
1da177e4 LT |
463 | if (entry->info->outdev) |
464 | if (entry->info->outdev->ifindex == ifindex) | |
465 | return 1; | |
ef47c6a7 PM |
466 | #ifdef CONFIG_BRIDGE_NETFILTER |
467 | if (entry->skb->nf_bridge) { | |
468 | if (entry->skb->nf_bridge->physindev && | |
469 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
470 | return 1; | |
471 | if (entry->skb->nf_bridge->physoutdev && | |
472 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
e905a9ed | 473 | return 1; |
ef47c6a7 PM |
474 | } |
475 | #endif | |
1da177e4 LT |
476 | return 0; |
477 | } | |
478 | ||
479 | static void | |
480 | ipq_dev_drop(int ifindex) | |
481 | { | |
482 | struct ipq_queue_entry *entry; | |
e905a9ed | 483 | |
1da177e4 LT |
484 | while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL) |
485 | ipq_issue_verdict(entry, NF_DROP); | |
486 | } | |
487 | ||
488 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
489 | ||
490 | static inline void | |
491 | ipq_rcv_skb(struct sk_buff *skb) | |
492 | { | |
493 | int status, type, pid, flags, nlmsglen, skblen; | |
494 | struct nlmsghdr *nlh; | |
495 | ||
496 | skblen = skb->len; | |
497 | if (skblen < sizeof(*nlh)) | |
498 | return; | |
499 | ||
500 | nlh = (struct nlmsghdr *)skb->data; | |
501 | nlmsglen = nlh->nlmsg_len; | |
502 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) | |
503 | return; | |
504 | ||
505 | pid = nlh->nlmsg_pid; | |
506 | flags = nlh->nlmsg_flags; | |
e905a9ed | 507 | |
1da177e4 LT |
508 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) |
509 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 510 | |
1da177e4 LT |
511 | if (flags & MSG_TRUNC) |
512 | RCV_SKB_FAIL(-ECOMM); | |
e905a9ed | 513 | |
1da177e4 LT |
514 | type = nlh->nlmsg_type; |
515 | if (type < NLMSG_NOOP || type >= IPQM_MAX) | |
516 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 517 | |
1da177e4 LT |
518 | if (type <= IPQM_BASE) |
519 | return; | |
e905a9ed | 520 | |
c7bdb545 | 521 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
1da177e4 | 522 | RCV_SKB_FAIL(-EPERM); |
e905a9ed | 523 | |
1da177e4 | 524 | write_lock_bh(&queue_lock); |
e905a9ed | 525 | |
1da177e4 LT |
526 | if (peer_pid) { |
527 | if (peer_pid != pid) { | |
528 | write_unlock_bh(&queue_lock); | |
529 | RCV_SKB_FAIL(-EBUSY); | |
530 | } | |
531 | } else { | |
532 | net_enable_timestamp(); | |
533 | peer_pid = pid; | |
534 | } | |
e905a9ed | 535 | |
1da177e4 | 536 | write_unlock_bh(&queue_lock); |
e905a9ed | 537 | |
1da177e4 | 538 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, |
e905a9ed | 539 | nlmsglen - NLMSG_LENGTH(0)); |
1da177e4 LT |
540 | if (status < 0) |
541 | RCV_SKB_FAIL(status); | |
e905a9ed | 542 | |
1da177e4 LT |
543 | if (flags & NLM_F_ACK) |
544 | netlink_ack(skb, nlh, 0); | |
e905a9ed | 545 | return; |
1da177e4 LT |
546 | } |
547 | ||
548 | static void | |
549 | ipq_rcv_sk(struct sock *sk, int len) | |
550 | { | |
2a0a6ebe HX |
551 | struct sk_buff *skb; |
552 | unsigned int qlen; | |
1da177e4 | 553 | |
4a3e2f71 | 554 | mutex_lock(&ipqnl_mutex); |
e905a9ed | 555 | |
2a0a6ebe HX |
556 | for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) { |
557 | skb = skb_dequeue(&sk->sk_receive_queue); | |
558 | ipq_rcv_skb(skb); | |
559 | kfree_skb(skb); | |
560 | } | |
e905a9ed | 561 | |
4a3e2f71 | 562 | mutex_unlock(&ipqnl_mutex); |
1da177e4 LT |
563 | } |
564 | ||
565 | static int | |
566 | ipq_rcv_dev_event(struct notifier_block *this, | |
e905a9ed | 567 | unsigned long event, void *ptr) |
1da177e4 LT |
568 | { |
569 | struct net_device *dev = ptr; | |
570 | ||
571 | /* Drop any packets associated with the downed device */ | |
572 | if (event == NETDEV_DOWN) | |
573 | ipq_dev_drop(dev->ifindex); | |
574 | return NOTIFY_DONE; | |
575 | } | |
576 | ||
577 | static struct notifier_block ipq_dev_notifier = { | |
578 | .notifier_call = ipq_rcv_dev_event, | |
579 | }; | |
580 | ||
581 | static int | |
582 | ipq_rcv_nl_event(struct notifier_block *this, | |
e905a9ed | 583 | unsigned long event, void *ptr) |
1da177e4 LT |
584 | { |
585 | struct netlink_notify *n = ptr; | |
586 | ||
587 | if (event == NETLINK_URELEASE && | |
588 | n->protocol == NETLINK_FIREWALL && n->pid) { | |
589 | write_lock_bh(&queue_lock); | |
590 | if (n->pid == peer_pid) | |
591 | __ipq_reset(); | |
592 | write_unlock_bh(&queue_lock); | |
593 | } | |
594 | return NOTIFY_DONE; | |
595 | } | |
596 | ||
597 | static struct notifier_block ipq_nl_notifier = { | |
598 | .notifier_call = ipq_rcv_nl_event, | |
599 | }; | |
600 | ||
601 | static struct ctl_table_header *ipq_sysctl_header; | |
602 | ||
603 | static ctl_table ipq_table[] = { | |
604 | { | |
605 | .ctl_name = NET_IPQ_QMAX, | |
606 | .procname = NET_IPQ_QMAX_NAME, | |
607 | .data = &queue_maxlen, | |
608 | .maxlen = sizeof(queue_maxlen), | |
609 | .mode = 0644, | |
610 | .proc_handler = proc_dointvec | |
611 | }, | |
e905a9ed | 612 | { .ctl_name = 0 } |
1da177e4 LT |
613 | }; |
614 | ||
615 | static ctl_table ipq_dir_table[] = { | |
616 | { | |
617 | .ctl_name = NET_IPV4, | |
618 | .procname = "ipv4", | |
619 | .mode = 0555, | |
620 | .child = ipq_table | |
621 | }, | |
622 | { .ctl_name = 0 } | |
623 | }; | |
624 | ||
625 | static ctl_table ipq_root_table[] = { | |
626 | { | |
627 | .ctl_name = CTL_NET, | |
628 | .procname = "net", | |
629 | .mode = 0555, | |
630 | .child = ipq_dir_table | |
631 | }, | |
632 | { .ctl_name = 0 } | |
633 | }; | |
634 | ||
635 | #ifdef CONFIG_PROC_FS | |
636 | static int | |
637 | ipq_get_info(char *buffer, char **start, off_t offset, int length) | |
638 | { | |
639 | int len; | |
640 | ||
641 | read_lock_bh(&queue_lock); | |
e905a9ed | 642 | |
1da177e4 | 643 | len = sprintf(buffer, |
e905a9ed YH |
644 | "Peer PID : %d\n" |
645 | "Copy mode : %hu\n" | |
646 | "Copy range : %u\n" | |
647 | "Queue length : %u\n" | |
648 | "Queue max. length : %u\n" | |
1da177e4 LT |
649 | "Queue dropped : %u\n" |
650 | "Netlink dropped : %u\n", | |
e905a9ed YH |
651 | peer_pid, |
652 | copy_mode, | |
653 | copy_range, | |
654 | queue_total, | |
655 | queue_maxlen, | |
1da177e4 LT |
656 | queue_dropped, |
657 | queue_user_dropped); | |
658 | ||
659 | read_unlock_bh(&queue_lock); | |
e905a9ed | 660 | |
1da177e4 LT |
661 | *start = buffer + offset; |
662 | len -= offset; | |
663 | if (len > length) | |
664 | len = length; | |
665 | else if (len < 0) | |
666 | len = 0; | |
667 | return len; | |
668 | } | |
669 | #endif /* CONFIG_PROC_FS */ | |
670 | ||
bbd86b9f HW |
671 | static struct nf_queue_handler nfqh = { |
672 | .name = "ip_queue", | |
673 | .outfn = &ipq_enqueue_packet, | |
674 | }; | |
675 | ||
32292a7f | 676 | static int __init ip_queue_init(void) |
1da177e4 LT |
677 | { |
678 | int status = -ENOMEM; | |
679 | struct proc_dir_entry *proc; | |
e905a9ed | 680 | |
1da177e4 | 681 | netlink_register_notifier(&ipq_nl_notifier); |
06628607 | 682 | ipqnl = netlink_kernel_create(NETLINK_FIREWALL, 0, ipq_rcv_sk, |
4fdb3bb7 | 683 | THIS_MODULE); |
1da177e4 LT |
684 | if (ipqnl == NULL) { |
685 | printk(KERN_ERR "ip_queue: failed to create netlink socket\n"); | |
686 | goto cleanup_netlink_notifier; | |
687 | } | |
688 | ||
689 | proc = proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info); | |
690 | if (proc) | |
691 | proc->owner = THIS_MODULE; | |
692 | else { | |
693 | printk(KERN_ERR "ip_queue: failed to create proc entry\n"); | |
694 | goto cleanup_ipqnl; | |
695 | } | |
e905a9ed | 696 | |
1da177e4 | 697 | register_netdevice_notifier(&ipq_dev_notifier); |
0b4d4147 | 698 | ipq_sysctl_header = register_sysctl_table(ipq_root_table); |
e905a9ed | 699 | |
bbd86b9f | 700 | status = nf_register_queue_handler(PF_INET, &nfqh); |
1da177e4 LT |
701 | if (status < 0) { |
702 | printk(KERN_ERR "ip_queue: failed to register queue handler\n"); | |
703 | goto cleanup_sysctl; | |
704 | } | |
705 | return status; | |
706 | ||
1da177e4 LT |
707 | cleanup_sysctl: |
708 | unregister_sysctl_table(ipq_sysctl_header); | |
709 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
710 | proc_net_remove(IPQ_PROC_FS_NAME); | |
e905a9ed | 711 | |
1da177e4 LT |
712 | cleanup_ipqnl: |
713 | sock_release(ipqnl->sk_socket); | |
4a3e2f71 AV |
714 | mutex_lock(&ipqnl_mutex); |
715 | mutex_unlock(&ipqnl_mutex); | |
e905a9ed | 716 | |
1da177e4 LT |
717 | cleanup_netlink_notifier: |
718 | netlink_unregister_notifier(&ipq_nl_notifier); | |
719 | return status; | |
720 | } | |
721 | ||
65b4b4e8 | 722 | static void __exit ip_queue_fini(void) |
1da177e4 | 723 | { |
32292a7f PM |
724 | nf_unregister_queue_handlers(&nfqh); |
725 | synchronize_net(); | |
726 | ipq_flush(NF_DROP); | |
727 | ||
728 | unregister_sysctl_table(ipq_sysctl_header); | |
729 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
730 | proc_net_remove(IPQ_PROC_FS_NAME); | |
731 | ||
732 | sock_release(ipqnl->sk_socket); | |
733 | mutex_lock(&ipqnl_mutex); | |
734 | mutex_unlock(&ipqnl_mutex); | |
735 | ||
736 | netlink_unregister_notifier(&ipq_nl_notifier); | |
1da177e4 LT |
737 | } |
738 | ||
739 | MODULE_DESCRIPTION("IPv4 packet queue handler"); | |
740 | MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>"); | |
741 | MODULE_LICENSE("GPL"); | |
742 | ||
65b4b4e8 AM |
743 | module_init(ip_queue_init); |
744 | module_exit(ip_queue_fini); |