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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> | |
7351a22a | 25 | #include <linux/seq_file.h> |
1da177e4 | 26 | #include <linux/security.h> |
4a3e2f71 | 27 | #include <linux/mutex.h> |
457c4cbc | 28 | #include <net/net_namespace.h> |
1da177e4 LT |
29 | #include <net/sock.h> |
30 | #include <net/route.h> | |
c01cd429 | 31 | #include <net/netfilter/nf_queue.h> |
1da177e4 LT |
32 | |
33 | #define IPQ_QMAX_DEFAULT 1024 | |
34 | #define IPQ_PROC_FS_NAME "ip_queue" | |
35 | #define NET_IPQ_QMAX 2088 | |
36 | #define NET_IPQ_QMAX_NAME "ip_queue_maxlen" | |
37 | ||
02f014d8 | 38 | typedef int (*ipq_cmpfn)(struct nf_queue_entry *, unsigned long); |
1da177e4 | 39 | |
1192e403 | 40 | static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE; |
94aec08e | 41 | static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT; |
1da177e4 | 42 | static DEFINE_RWLOCK(queue_lock); |
1192e403 BH |
43 | static int peer_pid __read_mostly; |
44 | static unsigned int copy_range __read_mostly; | |
1da177e4 LT |
45 | static unsigned int queue_total; |
46 | static unsigned int queue_dropped = 0; | |
47 | static unsigned int queue_user_dropped = 0; | |
1192e403 | 48 | static struct sock *ipqnl __read_mostly; |
1da177e4 | 49 | static LIST_HEAD(queue_list); |
4a3e2f71 | 50 | static DEFINE_MUTEX(ipqnl_mutex); |
1da177e4 LT |
51 | |
52 | static void | |
02f014d8 | 53 | ipq_issue_verdict(struct nf_queue_entry *entry, int verdict) |
1da177e4 | 54 | { |
9bb7bc94 HW |
55 | /* TCP input path (and probably other bits) assume to be called |
56 | * from softirq context, not from syscall, like ipq_issue_verdict is | |
57 | * called. TCP input path deadlocks with locks taken from timer | |
58 | * softirq, e.g. We therefore emulate this by local_bh_disable() */ | |
59 | ||
60 | local_bh_disable(); | |
02f014d8 | 61 | nf_reinject(entry, verdict); |
9bb7bc94 | 62 | local_bh_enable(); |
1da177e4 LT |
63 | } |
64 | ||
65 | static inline void | |
02f014d8 | 66 | __ipq_enqueue_entry(struct nf_queue_entry *entry) |
1da177e4 | 67 | { |
0ac41e81 | 68 | list_add_tail(&entry->list, &queue_list); |
1da177e4 LT |
69 | queue_total++; |
70 | } | |
71 | ||
1da177e4 LT |
72 | static inline int |
73 | __ipq_set_mode(unsigned char mode, unsigned int range) | |
74 | { | |
75 | int status = 0; | |
e905a9ed | 76 | |
1da177e4 LT |
77 | switch(mode) { |
78 | case IPQ_COPY_NONE: | |
79 | case IPQ_COPY_META: | |
80 | copy_mode = mode; | |
81 | copy_range = 0; | |
82 | break; | |
e905a9ed | 83 | |
1da177e4 LT |
84 | case IPQ_COPY_PACKET: |
85 | copy_mode = mode; | |
86 | copy_range = range; | |
87 | if (copy_range > 0xFFFF) | |
88 | copy_range = 0xFFFF; | |
89 | break; | |
e905a9ed | 90 | |
1da177e4 LT |
91 | default: |
92 | status = -EINVAL; | |
93 | ||
94 | } | |
95 | return status; | |
96 | } | |
97 | ||
95214092 PM |
98 | static void __ipq_flush(ipq_cmpfn cmpfn, unsigned long data); |
99 | ||
1da177e4 LT |
100 | static inline void |
101 | __ipq_reset(void) | |
102 | { | |
103 | peer_pid = 0; | |
104 | net_disable_timestamp(); | |
105 | __ipq_set_mode(IPQ_COPY_NONE, 0); | |
95214092 | 106 | __ipq_flush(NULL, 0); |
1da177e4 LT |
107 | } |
108 | ||
02f014d8 | 109 | static struct nf_queue_entry * |
95214092 | 110 | ipq_find_dequeue_entry(unsigned long id) |
1da177e4 | 111 | { |
02f014d8 | 112 | struct nf_queue_entry *entry = NULL, *i; |
e905a9ed | 113 | |
1da177e4 | 114 | write_lock_bh(&queue_lock); |
95214092 PM |
115 | |
116 | list_for_each_entry(i, &queue_list, list) { | |
117 | if ((unsigned long)i == id) { | |
118 | entry = i; | |
119 | break; | |
120 | } | |
121 | } | |
122 | ||
123 | if (entry) { | |
124 | list_del(&entry->list); | |
125 | queue_total--; | |
126 | } | |
127 | ||
1da177e4 LT |
128 | write_unlock_bh(&queue_lock); |
129 | return entry; | |
130 | } | |
131 | ||
132 | static void | |
95214092 PM |
133 | __ipq_flush(ipq_cmpfn cmpfn, unsigned long data) |
134 | { | |
02f014d8 | 135 | struct nf_queue_entry *entry, *next; |
95214092 PM |
136 | |
137 | list_for_each_entry_safe(entry, next, &queue_list, list) { | |
138 | if (!cmpfn || cmpfn(entry, data)) { | |
139 | list_del(&entry->list); | |
140 | queue_total--; | |
141 | ipq_issue_verdict(entry, NF_DROP); | |
142 | } | |
143 | } | |
144 | } | |
145 | ||
146 | static void | |
147 | ipq_flush(ipq_cmpfn cmpfn, unsigned long data) | |
1da177e4 LT |
148 | { |
149 | write_lock_bh(&queue_lock); | |
95214092 | 150 | __ipq_flush(cmpfn, data); |
1da177e4 LT |
151 | write_unlock_bh(&queue_lock); |
152 | } | |
153 | ||
154 | static struct sk_buff * | |
02f014d8 | 155 | ipq_build_packet_message(struct nf_queue_entry *entry, int *errp) |
1da177e4 | 156 | { |
27a884dc | 157 | sk_buff_data_t old_tail; |
1da177e4 LT |
158 | size_t size = 0; |
159 | size_t data_len = 0; | |
160 | struct sk_buff *skb; | |
161 | struct ipq_packet_msg *pmsg; | |
162 | struct nlmsghdr *nlh; | |
b7aa0bf7 | 163 | struct timeval tv; |
1da177e4 LT |
164 | |
165 | read_lock_bh(&queue_lock); | |
e905a9ed | 166 | |
1da177e4 LT |
167 | switch (copy_mode) { |
168 | case IPQ_COPY_META: | |
169 | case IPQ_COPY_NONE: | |
170 | size = NLMSG_SPACE(sizeof(*pmsg)); | |
171 | data_len = 0; | |
172 | break; | |
e905a9ed | 173 | |
1da177e4 | 174 | case IPQ_COPY_PACKET: |
84fa7933 PM |
175 | if ((entry->skb->ip_summed == CHECKSUM_PARTIAL || |
176 | entry->skb->ip_summed == CHECKSUM_COMPLETE) && | |
177 | (*errp = skb_checksum_help(entry->skb))) { | |
66a79a19 PM |
178 | read_unlock_bh(&queue_lock); |
179 | return NULL; | |
180 | } | |
1da177e4 LT |
181 | if (copy_range == 0 || copy_range > entry->skb->len) |
182 | data_len = entry->skb->len; | |
183 | else | |
184 | data_len = copy_range; | |
e905a9ed | 185 | |
1da177e4 LT |
186 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); |
187 | break; | |
e905a9ed | 188 | |
1da177e4 LT |
189 | default: |
190 | *errp = -EINVAL; | |
191 | read_unlock_bh(&queue_lock); | |
192 | return NULL; | |
193 | } | |
194 | ||
195 | read_unlock_bh(&queue_lock); | |
196 | ||
197 | skb = alloc_skb(size, GFP_ATOMIC); | |
198 | if (!skb) | |
199 | goto nlmsg_failure; | |
e905a9ed | 200 | |
27a884dc | 201 | old_tail = skb->tail; |
1da177e4 LT |
202 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); |
203 | pmsg = NLMSG_DATA(nlh); | |
204 | memset(pmsg, 0, sizeof(*pmsg)); | |
205 | ||
206 | pmsg->packet_id = (unsigned long )entry; | |
207 | pmsg->data_len = data_len; | |
b7aa0bf7 ED |
208 | tv = ktime_to_timeval(entry->skb->tstamp); |
209 | pmsg->timestamp_sec = tv.tv_sec; | |
210 | pmsg->timestamp_usec = tv.tv_usec; | |
82e91ffe | 211 | pmsg->mark = entry->skb->mark; |
02f014d8 | 212 | pmsg->hook = entry->hook; |
1da177e4 | 213 | pmsg->hw_protocol = entry->skb->protocol; |
e905a9ed | 214 | |
02f014d8 PM |
215 | if (entry->indev) |
216 | strcpy(pmsg->indev_name, entry->indev->name); | |
1da177e4 LT |
217 | else |
218 | pmsg->indev_name[0] = '\0'; | |
e905a9ed | 219 | |
02f014d8 PM |
220 | if (entry->outdev) |
221 | strcpy(pmsg->outdev_name, entry->outdev->name); | |
1da177e4 LT |
222 | else |
223 | pmsg->outdev_name[0] = '\0'; | |
e905a9ed | 224 | |
02f014d8 | 225 | if (entry->indev && entry->skb->dev) { |
1da177e4 | 226 | pmsg->hw_type = entry->skb->dev->type; |
b95cce35 SH |
227 | pmsg->hw_addrlen = dev_parse_header(entry->skb, |
228 | pmsg->hw_addr); | |
1da177e4 | 229 | } |
e905a9ed | 230 | |
1da177e4 LT |
231 | if (data_len) |
232 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) | |
233 | BUG(); | |
e905a9ed | 234 | |
1da177e4 LT |
235 | nlh->nlmsg_len = skb->tail - old_tail; |
236 | return skb; | |
237 | ||
238 | nlmsg_failure: | |
239 | if (skb) | |
240 | kfree_skb(skb); | |
241 | *errp = -EINVAL; | |
242 | printk(KERN_ERR "ip_queue: error creating packet message\n"); | |
243 | return NULL; | |
244 | } | |
245 | ||
246 | static int | |
02f014d8 | 247 | ipq_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
1da177e4 LT |
248 | { |
249 | int status = -EINVAL; | |
250 | struct sk_buff *nskb; | |
1da177e4 LT |
251 | |
252 | if (copy_mode == IPQ_COPY_NONE) | |
253 | return -EAGAIN; | |
254 | ||
1da177e4 LT |
255 | nskb = ipq_build_packet_message(entry, &status); |
256 | if (nskb == NULL) | |
02f014d8 | 257 | return status; |
e905a9ed | 258 | |
1da177e4 | 259 | write_lock_bh(&queue_lock); |
e905a9ed | 260 | |
1da177e4 | 261 | if (!peer_pid) |
e905a9ed | 262 | goto err_out_free_nskb; |
1da177e4 LT |
263 | |
264 | if (queue_total >= queue_maxlen) { | |
e905a9ed | 265 | queue_dropped++; |
1da177e4 LT |
266 | status = -ENOSPC; |
267 | if (net_ratelimit()) | |
e905a9ed | 268 | printk (KERN_WARNING "ip_queue: full at %d entries, " |
1da177e4 LT |
269 | "dropping packets(s). Dropped: %d\n", queue_total, |
270 | queue_dropped); | |
271 | goto err_out_free_nskb; | |
272 | } | |
273 | ||
e905a9ed | 274 | /* netlink_unicast will either free the nskb or attach it to a socket */ |
1da177e4 LT |
275 | status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT); |
276 | if (status < 0) { | |
e905a9ed | 277 | queue_user_dropped++; |
1da177e4 LT |
278 | goto err_out_unlock; |
279 | } | |
280 | ||
281 | __ipq_enqueue_entry(entry); | |
282 | ||
283 | write_unlock_bh(&queue_lock); | |
284 | return status; | |
285 | ||
286 | err_out_free_nskb: | |
e905a9ed YH |
287 | kfree_skb(nskb); |
288 | ||
1da177e4 LT |
289 | err_out_unlock: |
290 | write_unlock_bh(&queue_lock); | |
1da177e4 LT |
291 | return status; |
292 | } | |
293 | ||
294 | static int | |
02f014d8 | 295 | ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct nf_queue_entry *e) |
1da177e4 LT |
296 | { |
297 | int diff; | |
2ca7b0ac | 298 | int err; |
1da177e4 LT |
299 | struct iphdr *user_iph = (struct iphdr *)v->payload; |
300 | ||
301 | if (v->data_len < sizeof(*user_iph)) | |
302 | return 0; | |
303 | diff = v->data_len - e->skb->len; | |
d8a585d7 PM |
304 | if (diff < 0) { |
305 | if (pskb_trim(e->skb, v->data_len)) | |
306 | return -ENOMEM; | |
307 | } else if (diff > 0) { | |
1da177e4 LT |
308 | if (v->data_len > 0xFFFF) |
309 | return -EINVAL; | |
310 | if (diff > skb_tailroom(e->skb)) { | |
2ca7b0ac HX |
311 | err = pskb_expand_head(e->skb, 0, |
312 | diff - skb_tailroom(e->skb), | |
313 | GFP_ATOMIC); | |
314 | if (err) { | |
315 | printk(KERN_WARNING "ip_queue: error " | |
316 | "in mangle, dropping packet: %d\n", -err); | |
317 | return err; | |
1da177e4 | 318 | } |
1da177e4 LT |
319 | } |
320 | skb_put(e->skb, diff); | |
321 | } | |
37d41879 | 322 | if (!skb_make_writable(e->skb, v->data_len)) |
1da177e4 | 323 | return -ENOMEM; |
27d7ff46 | 324 | skb_copy_to_linear_data(e->skb, v->payload, v->data_len); |
66a79a19 | 325 | e->skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 326 | |
1da177e4 LT |
327 | return 0; |
328 | } | |
329 | ||
1da177e4 LT |
330 | static int |
331 | ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len) | |
332 | { | |
02f014d8 | 333 | struct nf_queue_entry *entry; |
1da177e4 LT |
334 | |
335 | if (vmsg->value > NF_MAX_VERDICT) | |
336 | return -EINVAL; | |
337 | ||
95214092 | 338 | entry = ipq_find_dequeue_entry(vmsg->id); |
1da177e4 LT |
339 | if (entry == NULL) |
340 | return -ENOENT; | |
341 | else { | |
342 | int verdict = vmsg->value; | |
e905a9ed | 343 | |
1da177e4 LT |
344 | if (vmsg->data_len && vmsg->data_len == len) |
345 | if (ipq_mangle_ipv4(vmsg, entry) < 0) | |
346 | verdict = NF_DROP; | |
e905a9ed | 347 | |
1da177e4 LT |
348 | ipq_issue_verdict(entry, verdict); |
349 | return 0; | |
350 | } | |
351 | } | |
352 | ||
353 | static int | |
354 | ipq_set_mode(unsigned char mode, unsigned int range) | |
355 | { | |
356 | int status; | |
357 | ||
358 | write_lock_bh(&queue_lock); | |
359 | status = __ipq_set_mode(mode, range); | |
360 | write_unlock_bh(&queue_lock); | |
361 | return status; | |
362 | } | |
363 | ||
364 | static int | |
365 | ipq_receive_peer(struct ipq_peer_msg *pmsg, | |
e905a9ed | 366 | unsigned char type, unsigned int len) |
1da177e4 LT |
367 | { |
368 | int status = 0; | |
369 | ||
370 | if (len < sizeof(*pmsg)) | |
371 | return -EINVAL; | |
372 | ||
373 | switch (type) { | |
374 | case IPQM_MODE: | |
375 | status = ipq_set_mode(pmsg->msg.mode.value, | |
e905a9ed | 376 | pmsg->msg.mode.range); |
1da177e4 | 377 | break; |
e905a9ed | 378 | |
1da177e4 LT |
379 | case IPQM_VERDICT: |
380 | if (pmsg->msg.verdict.value > NF_MAX_VERDICT) | |
381 | status = -EINVAL; | |
382 | else | |
383 | status = ipq_set_verdict(&pmsg->msg.verdict, | |
e905a9ed | 384 | len - sizeof(*pmsg)); |
1da177e4 LT |
385 | break; |
386 | default: | |
387 | status = -EINVAL; | |
388 | } | |
389 | return status; | |
390 | } | |
391 | ||
392 | static int | |
02f014d8 | 393 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
1da177e4 | 394 | { |
02f014d8 PM |
395 | if (entry->indev) |
396 | if (entry->indev->ifindex == ifindex) | |
1da177e4 | 397 | return 1; |
02f014d8 PM |
398 | if (entry->outdev) |
399 | if (entry->outdev->ifindex == ifindex) | |
1da177e4 | 400 | return 1; |
ef47c6a7 PM |
401 | #ifdef CONFIG_BRIDGE_NETFILTER |
402 | if (entry->skb->nf_bridge) { | |
403 | if (entry->skb->nf_bridge->physindev && | |
404 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
405 | return 1; | |
406 | if (entry->skb->nf_bridge->physoutdev && | |
407 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
e905a9ed | 408 | return 1; |
ef47c6a7 PM |
409 | } |
410 | #endif | |
1da177e4 LT |
411 | return 0; |
412 | } | |
413 | ||
414 | static void | |
415 | ipq_dev_drop(int ifindex) | |
416 | { | |
95214092 | 417 | ipq_flush(dev_cmp, ifindex); |
1da177e4 LT |
418 | } |
419 | ||
420 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
421 | ||
422 | static inline void | |
cd40b7d3 | 423 | __ipq_rcv_skb(struct sk_buff *skb) |
1da177e4 LT |
424 | { |
425 | int status, type, pid, flags, nlmsglen, skblen; | |
426 | struct nlmsghdr *nlh; | |
427 | ||
428 | skblen = skb->len; | |
429 | if (skblen < sizeof(*nlh)) | |
430 | return; | |
431 | ||
b529ccf2 | 432 | nlh = nlmsg_hdr(skb); |
1da177e4 LT |
433 | nlmsglen = nlh->nlmsg_len; |
434 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) | |
435 | return; | |
436 | ||
437 | pid = nlh->nlmsg_pid; | |
438 | flags = nlh->nlmsg_flags; | |
e905a9ed | 439 | |
1da177e4 LT |
440 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) |
441 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 442 | |
1da177e4 LT |
443 | if (flags & MSG_TRUNC) |
444 | RCV_SKB_FAIL(-ECOMM); | |
e905a9ed | 445 | |
1da177e4 LT |
446 | type = nlh->nlmsg_type; |
447 | if (type < NLMSG_NOOP || type >= IPQM_MAX) | |
448 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 449 | |
1da177e4 LT |
450 | if (type <= IPQM_BASE) |
451 | return; | |
e905a9ed | 452 | |
c7bdb545 | 453 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
1da177e4 | 454 | RCV_SKB_FAIL(-EPERM); |
e905a9ed | 455 | |
1da177e4 | 456 | write_lock_bh(&queue_lock); |
e905a9ed | 457 | |
1da177e4 LT |
458 | if (peer_pid) { |
459 | if (peer_pid != pid) { | |
460 | write_unlock_bh(&queue_lock); | |
461 | RCV_SKB_FAIL(-EBUSY); | |
462 | } | |
463 | } else { | |
464 | net_enable_timestamp(); | |
465 | peer_pid = pid; | |
466 | } | |
e905a9ed | 467 | |
1da177e4 | 468 | write_unlock_bh(&queue_lock); |
e905a9ed | 469 | |
1da177e4 | 470 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, |
e905a9ed | 471 | nlmsglen - NLMSG_LENGTH(0)); |
1da177e4 LT |
472 | if (status < 0) |
473 | RCV_SKB_FAIL(status); | |
e905a9ed | 474 | |
1da177e4 LT |
475 | if (flags & NLM_F_ACK) |
476 | netlink_ack(skb, nlh, 0); | |
e905a9ed | 477 | return; |
1da177e4 LT |
478 | } |
479 | ||
480 | static void | |
cd40b7d3 | 481 | ipq_rcv_skb(struct sk_buff *skb) |
1da177e4 | 482 | { |
4a3e2f71 | 483 | mutex_lock(&ipqnl_mutex); |
cd40b7d3 | 484 | __ipq_rcv_skb(skb); |
4a3e2f71 | 485 | mutex_unlock(&ipqnl_mutex); |
1da177e4 LT |
486 | } |
487 | ||
488 | static int | |
489 | ipq_rcv_dev_event(struct notifier_block *this, | |
e905a9ed | 490 | unsigned long event, void *ptr) |
1da177e4 LT |
491 | { |
492 | struct net_device *dev = ptr; | |
493 | ||
e9dc8653 EB |
494 | if (dev->nd_net != &init_net) |
495 | return NOTIFY_DONE; | |
496 | ||
1da177e4 LT |
497 | /* Drop any packets associated with the downed device */ |
498 | if (event == NETDEV_DOWN) | |
499 | ipq_dev_drop(dev->ifindex); | |
500 | return NOTIFY_DONE; | |
501 | } | |
502 | ||
503 | static struct notifier_block ipq_dev_notifier = { | |
504 | .notifier_call = ipq_rcv_dev_event, | |
505 | }; | |
506 | ||
507 | static int | |
508 | ipq_rcv_nl_event(struct notifier_block *this, | |
e905a9ed | 509 | unsigned long event, void *ptr) |
1da177e4 LT |
510 | { |
511 | struct netlink_notify *n = ptr; | |
512 | ||
513 | if (event == NETLINK_URELEASE && | |
514 | n->protocol == NETLINK_FIREWALL && n->pid) { | |
515 | write_lock_bh(&queue_lock); | |
b4b51029 | 516 | if ((n->net == &init_net) && (n->pid == peer_pid)) |
1da177e4 LT |
517 | __ipq_reset(); |
518 | write_unlock_bh(&queue_lock); | |
519 | } | |
520 | return NOTIFY_DONE; | |
521 | } | |
522 | ||
523 | static struct notifier_block ipq_nl_notifier = { | |
524 | .notifier_call = ipq_rcv_nl_event, | |
525 | }; | |
526 | ||
527 | static struct ctl_table_header *ipq_sysctl_header; | |
528 | ||
529 | static ctl_table ipq_table[] = { | |
530 | { | |
531 | .ctl_name = NET_IPQ_QMAX, | |
532 | .procname = NET_IPQ_QMAX_NAME, | |
533 | .data = &queue_maxlen, | |
534 | .maxlen = sizeof(queue_maxlen), | |
535 | .mode = 0644, | |
536 | .proc_handler = proc_dointvec | |
537 | }, | |
e905a9ed | 538 | { .ctl_name = 0 } |
1da177e4 LT |
539 | }; |
540 | ||
541 | static ctl_table ipq_dir_table[] = { | |
542 | { | |
543 | .ctl_name = NET_IPV4, | |
544 | .procname = "ipv4", | |
545 | .mode = 0555, | |
546 | .child = ipq_table | |
547 | }, | |
548 | { .ctl_name = 0 } | |
549 | }; | |
550 | ||
551 | static ctl_table ipq_root_table[] = { | |
552 | { | |
553 | .ctl_name = CTL_NET, | |
554 | .procname = "net", | |
555 | .mode = 0555, | |
556 | .child = ipq_dir_table | |
557 | }, | |
558 | { .ctl_name = 0 } | |
559 | }; | |
560 | ||
7351a22a | 561 | static int ip_queue_show(struct seq_file *m, void *v) |
1da177e4 | 562 | { |
1da177e4 | 563 | read_lock_bh(&queue_lock); |
e905a9ed | 564 | |
7351a22a | 565 | seq_printf(m, |
e905a9ed YH |
566 | "Peer PID : %d\n" |
567 | "Copy mode : %hu\n" | |
568 | "Copy range : %u\n" | |
569 | "Queue length : %u\n" | |
570 | "Queue max. length : %u\n" | |
1da177e4 LT |
571 | "Queue dropped : %u\n" |
572 | "Netlink dropped : %u\n", | |
e905a9ed YH |
573 | peer_pid, |
574 | copy_mode, | |
575 | copy_range, | |
576 | queue_total, | |
577 | queue_maxlen, | |
1da177e4 LT |
578 | queue_dropped, |
579 | queue_user_dropped); | |
580 | ||
581 | read_unlock_bh(&queue_lock); | |
7351a22a AD |
582 | return 0; |
583 | } | |
e905a9ed | 584 | |
7351a22a AD |
585 | static int ip_queue_open(struct inode *inode, struct file *file) |
586 | { | |
587 | return single_open(file, ip_queue_show, NULL); | |
1da177e4 | 588 | } |
7351a22a AD |
589 | |
590 | static const struct file_operations ip_queue_proc_fops = { | |
591 | .open = ip_queue_open, | |
592 | .read = seq_read, | |
593 | .llseek = seq_lseek, | |
594 | .release = single_release, | |
595 | .owner = THIS_MODULE, | |
596 | }; | |
1da177e4 | 597 | |
e3ac5298 | 598 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
599 | .name = "ip_queue", |
600 | .outfn = &ipq_enqueue_packet, | |
601 | }; | |
602 | ||
32292a7f | 603 | static int __init ip_queue_init(void) |
1da177e4 LT |
604 | { |
605 | int status = -ENOMEM; | |
606 | struct proc_dir_entry *proc; | |
e905a9ed | 607 | |
1da177e4 | 608 | netlink_register_notifier(&ipq_nl_notifier); |
b4b51029 | 609 | ipqnl = netlink_kernel_create(&init_net, NETLINK_FIREWALL, 0, |
cd40b7d3 | 610 | ipq_rcv_skb, NULL, THIS_MODULE); |
1da177e4 LT |
611 | if (ipqnl == NULL) { |
612 | printk(KERN_ERR "ip_queue: failed to create netlink socket\n"); | |
613 | goto cleanup_netlink_notifier; | |
614 | } | |
615 | ||
7351a22a AD |
616 | proc = create_proc_entry(IPQ_PROC_FS_NAME, 0, init_net.proc_net); |
617 | if (proc) { | |
1da177e4 | 618 | proc->owner = THIS_MODULE; |
7351a22a AD |
619 | proc->proc_fops = &ip_queue_proc_fops; |
620 | } else { | |
1da177e4 LT |
621 | printk(KERN_ERR "ip_queue: failed to create proc entry\n"); |
622 | goto cleanup_ipqnl; | |
623 | } | |
e905a9ed | 624 | |
1da177e4 | 625 | register_netdevice_notifier(&ipq_dev_notifier); |
0b4d4147 | 626 | ipq_sysctl_header = register_sysctl_table(ipq_root_table); |
e905a9ed | 627 | |
bbd86b9f | 628 | status = nf_register_queue_handler(PF_INET, &nfqh); |
1da177e4 LT |
629 | if (status < 0) { |
630 | printk(KERN_ERR "ip_queue: failed to register queue handler\n"); | |
631 | goto cleanup_sysctl; | |
632 | } | |
633 | return status; | |
634 | ||
1da177e4 LT |
635 | cleanup_sysctl: |
636 | unregister_sysctl_table(ipq_sysctl_header); | |
637 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
457c4cbc | 638 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
1da177e4 LT |
639 | cleanup_ipqnl: |
640 | sock_release(ipqnl->sk_socket); | |
4a3e2f71 AV |
641 | mutex_lock(&ipqnl_mutex); |
642 | mutex_unlock(&ipqnl_mutex); | |
e905a9ed | 643 | |
1da177e4 LT |
644 | cleanup_netlink_notifier: |
645 | netlink_unregister_notifier(&ipq_nl_notifier); | |
646 | return status; | |
647 | } | |
648 | ||
65b4b4e8 | 649 | static void __exit ip_queue_fini(void) |
1da177e4 | 650 | { |
32292a7f PM |
651 | nf_unregister_queue_handlers(&nfqh); |
652 | synchronize_net(); | |
95214092 | 653 | ipq_flush(NULL, 0); |
32292a7f PM |
654 | |
655 | unregister_sysctl_table(ipq_sysctl_header); | |
656 | unregister_netdevice_notifier(&ipq_dev_notifier); | |
457c4cbc | 657 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
32292a7f PM |
658 | |
659 | sock_release(ipqnl->sk_socket); | |
660 | mutex_lock(&ipqnl_mutex); | |
661 | mutex_unlock(&ipqnl_mutex); | |
662 | ||
663 | netlink_unregister_notifier(&ipq_nl_notifier); | |
1da177e4 LT |
664 | } |
665 | ||
666 | MODULE_DESCRIPTION("IPv4 packet queue handler"); | |
667 | MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>"); | |
668 | MODULE_LICENSE("GPL"); | |
669 | ||
65b4b4e8 AM |
670 | module_init(ip_queue_init); |
671 | module_exit(ip_queue_fini); |