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> |
3d7cc2ba | 32 | #include <net/ip.h> |
1da177e4 LT |
33 | |
34 | #define IPQ_QMAX_DEFAULT 1024 | |
35 | #define IPQ_PROC_FS_NAME "ip_queue" | |
36 | #define NET_IPQ_QMAX 2088 | |
37 | #define NET_IPQ_QMAX_NAME "ip_queue_maxlen" | |
38 | ||
02f014d8 | 39 | typedef int (*ipq_cmpfn)(struct nf_queue_entry *, unsigned long); |
1da177e4 | 40 | |
1192e403 | 41 | static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE; |
94aec08e | 42 | static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT; |
1da177e4 | 43 | static DEFINE_RWLOCK(queue_lock); |
1192e403 BH |
44 | static int peer_pid __read_mostly; |
45 | static unsigned int copy_range __read_mostly; | |
1da177e4 LT |
46 | static unsigned int queue_total; |
47 | static unsigned int queue_dropped = 0; | |
48 | static unsigned int queue_user_dropped = 0; | |
1192e403 | 49 | static struct sock *ipqnl __read_mostly; |
1da177e4 | 50 | static LIST_HEAD(queue_list); |
4a3e2f71 | 51 | static DEFINE_MUTEX(ipqnl_mutex); |
1da177e4 | 52 | |
1da177e4 | 53 | static inline void |
02f014d8 | 54 | __ipq_enqueue_entry(struct nf_queue_entry *entry) |
1da177e4 | 55 | { |
0ac41e81 | 56 | list_add_tail(&entry->list, &queue_list); |
1da177e4 LT |
57 | queue_total++; |
58 | } | |
59 | ||
1da177e4 LT |
60 | static inline int |
61 | __ipq_set_mode(unsigned char mode, unsigned int range) | |
62 | { | |
63 | int status = 0; | |
e905a9ed | 64 | |
1da177e4 LT |
65 | switch(mode) { |
66 | case IPQ_COPY_NONE: | |
67 | case IPQ_COPY_META: | |
68 | copy_mode = mode; | |
69 | copy_range = 0; | |
70 | break; | |
e905a9ed | 71 | |
1da177e4 LT |
72 | case IPQ_COPY_PACKET: |
73 | copy_mode = mode; | |
74 | copy_range = range; | |
75 | if (copy_range > 0xFFFF) | |
76 | copy_range = 0xFFFF; | |
77 | break; | |
e905a9ed | 78 | |
1da177e4 LT |
79 | default: |
80 | status = -EINVAL; | |
81 | ||
82 | } | |
83 | return status; | |
84 | } | |
85 | ||
95214092 PM |
86 | static void __ipq_flush(ipq_cmpfn cmpfn, unsigned long data); |
87 | ||
1da177e4 LT |
88 | static inline void |
89 | __ipq_reset(void) | |
90 | { | |
91 | peer_pid = 0; | |
92 | net_disable_timestamp(); | |
93 | __ipq_set_mode(IPQ_COPY_NONE, 0); | |
95214092 | 94 | __ipq_flush(NULL, 0); |
1da177e4 LT |
95 | } |
96 | ||
02f014d8 | 97 | static struct nf_queue_entry * |
95214092 | 98 | ipq_find_dequeue_entry(unsigned long id) |
1da177e4 | 99 | { |
02f014d8 | 100 | struct nf_queue_entry *entry = NULL, *i; |
e905a9ed | 101 | |
1da177e4 | 102 | write_lock_bh(&queue_lock); |
95214092 PM |
103 | |
104 | list_for_each_entry(i, &queue_list, list) { | |
105 | if ((unsigned long)i == id) { | |
106 | entry = i; | |
107 | break; | |
108 | } | |
109 | } | |
110 | ||
111 | if (entry) { | |
112 | list_del(&entry->list); | |
113 | queue_total--; | |
114 | } | |
115 | ||
1da177e4 LT |
116 | write_unlock_bh(&queue_lock); |
117 | return entry; | |
118 | } | |
119 | ||
120 | static void | |
95214092 PM |
121 | __ipq_flush(ipq_cmpfn cmpfn, unsigned long data) |
122 | { | |
02f014d8 | 123 | struct nf_queue_entry *entry, *next; |
95214092 PM |
124 | |
125 | list_for_each_entry_safe(entry, next, &queue_list, list) { | |
126 | if (!cmpfn || cmpfn(entry, data)) { | |
127 | list_del(&entry->list); | |
128 | queue_total--; | |
4b3d15ef | 129 | nf_reinject(entry, NF_DROP); |
95214092 PM |
130 | } |
131 | } | |
132 | } | |
133 | ||
134 | static void | |
135 | ipq_flush(ipq_cmpfn cmpfn, unsigned long data) | |
1da177e4 LT |
136 | { |
137 | write_lock_bh(&queue_lock); | |
95214092 | 138 | __ipq_flush(cmpfn, data); |
1da177e4 LT |
139 | write_unlock_bh(&queue_lock); |
140 | } | |
141 | ||
142 | static struct sk_buff * | |
02f014d8 | 143 | ipq_build_packet_message(struct nf_queue_entry *entry, int *errp) |
1da177e4 | 144 | { |
27a884dc | 145 | sk_buff_data_t old_tail; |
1da177e4 LT |
146 | size_t size = 0; |
147 | size_t data_len = 0; | |
148 | struct sk_buff *skb; | |
149 | struct ipq_packet_msg *pmsg; | |
150 | struct nlmsghdr *nlh; | |
b7aa0bf7 | 151 | struct timeval tv; |
1da177e4 LT |
152 | |
153 | read_lock_bh(&queue_lock); | |
e905a9ed | 154 | |
1da177e4 LT |
155 | switch (copy_mode) { |
156 | case IPQ_COPY_META: | |
157 | case IPQ_COPY_NONE: | |
158 | size = NLMSG_SPACE(sizeof(*pmsg)); | |
159 | data_len = 0; | |
160 | break; | |
e905a9ed | 161 | |
1da177e4 | 162 | case IPQ_COPY_PACKET: |
84fa7933 PM |
163 | if ((entry->skb->ip_summed == CHECKSUM_PARTIAL || |
164 | entry->skb->ip_summed == CHECKSUM_COMPLETE) && | |
165 | (*errp = skb_checksum_help(entry->skb))) { | |
66a79a19 PM |
166 | read_unlock_bh(&queue_lock); |
167 | return NULL; | |
168 | } | |
1da177e4 LT |
169 | if (copy_range == 0 || copy_range > entry->skb->len) |
170 | data_len = entry->skb->len; | |
171 | else | |
172 | data_len = copy_range; | |
e905a9ed | 173 | |
1da177e4 LT |
174 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); |
175 | break; | |
e905a9ed | 176 | |
1da177e4 LT |
177 | default: |
178 | *errp = -EINVAL; | |
179 | read_unlock_bh(&queue_lock); | |
180 | return NULL; | |
181 | } | |
182 | ||
183 | read_unlock_bh(&queue_lock); | |
184 | ||
185 | skb = alloc_skb(size, GFP_ATOMIC); | |
186 | if (!skb) | |
187 | goto nlmsg_failure; | |
e905a9ed | 188 | |
27a884dc | 189 | old_tail = skb->tail; |
1da177e4 LT |
190 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); |
191 | pmsg = NLMSG_DATA(nlh); | |
192 | memset(pmsg, 0, sizeof(*pmsg)); | |
193 | ||
194 | pmsg->packet_id = (unsigned long )entry; | |
195 | pmsg->data_len = data_len; | |
b7aa0bf7 ED |
196 | tv = ktime_to_timeval(entry->skb->tstamp); |
197 | pmsg->timestamp_sec = tv.tv_sec; | |
198 | pmsg->timestamp_usec = tv.tv_usec; | |
82e91ffe | 199 | pmsg->mark = entry->skb->mark; |
02f014d8 | 200 | pmsg->hook = entry->hook; |
1da177e4 | 201 | pmsg->hw_protocol = entry->skb->protocol; |
e905a9ed | 202 | |
02f014d8 PM |
203 | if (entry->indev) |
204 | strcpy(pmsg->indev_name, entry->indev->name); | |
1da177e4 LT |
205 | else |
206 | pmsg->indev_name[0] = '\0'; | |
e905a9ed | 207 | |
02f014d8 PM |
208 | if (entry->outdev) |
209 | strcpy(pmsg->outdev_name, entry->outdev->name); | |
1da177e4 LT |
210 | else |
211 | pmsg->outdev_name[0] = '\0'; | |
e905a9ed | 212 | |
02f014d8 | 213 | if (entry->indev && entry->skb->dev) { |
1da177e4 | 214 | pmsg->hw_type = entry->skb->dev->type; |
b95cce35 SH |
215 | pmsg->hw_addrlen = dev_parse_header(entry->skb, |
216 | pmsg->hw_addr); | |
1da177e4 | 217 | } |
e905a9ed | 218 | |
1da177e4 LT |
219 | if (data_len) |
220 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) | |
221 | BUG(); | |
e905a9ed | 222 | |
1da177e4 LT |
223 | nlh->nlmsg_len = skb->tail - old_tail; |
224 | return skb; | |
225 | ||
226 | nlmsg_failure: | |
227 | if (skb) | |
228 | kfree_skb(skb); | |
229 | *errp = -EINVAL; | |
230 | printk(KERN_ERR "ip_queue: error creating packet message\n"); | |
231 | return NULL; | |
232 | } | |
233 | ||
234 | static int | |
02f014d8 | 235 | ipq_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
1da177e4 LT |
236 | { |
237 | int status = -EINVAL; | |
238 | struct sk_buff *nskb; | |
1da177e4 LT |
239 | |
240 | if (copy_mode == IPQ_COPY_NONE) | |
241 | return -EAGAIN; | |
242 | ||
1da177e4 LT |
243 | nskb = ipq_build_packet_message(entry, &status); |
244 | if (nskb == NULL) | |
02f014d8 | 245 | return status; |
e905a9ed | 246 | |
1da177e4 | 247 | write_lock_bh(&queue_lock); |
e905a9ed | 248 | |
1da177e4 | 249 | if (!peer_pid) |
e905a9ed | 250 | goto err_out_free_nskb; |
1da177e4 LT |
251 | |
252 | if (queue_total >= queue_maxlen) { | |
e905a9ed | 253 | queue_dropped++; |
1da177e4 LT |
254 | status = -ENOSPC; |
255 | if (net_ratelimit()) | |
e905a9ed | 256 | printk (KERN_WARNING "ip_queue: full at %d entries, " |
1da177e4 LT |
257 | "dropping packets(s). Dropped: %d\n", queue_total, |
258 | queue_dropped); | |
259 | goto err_out_free_nskb; | |
260 | } | |
261 | ||
e905a9ed | 262 | /* netlink_unicast will either free the nskb or attach it to a socket */ |
1da177e4 LT |
263 | status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT); |
264 | if (status < 0) { | |
e905a9ed | 265 | queue_user_dropped++; |
1da177e4 LT |
266 | goto err_out_unlock; |
267 | } | |
268 | ||
269 | __ipq_enqueue_entry(entry); | |
270 | ||
271 | write_unlock_bh(&queue_lock); | |
272 | return status; | |
273 | ||
274 | err_out_free_nskb: | |
e905a9ed YH |
275 | kfree_skb(nskb); |
276 | ||
1da177e4 LT |
277 | err_out_unlock: |
278 | write_unlock_bh(&queue_lock); | |
1da177e4 LT |
279 | return status; |
280 | } | |
281 | ||
282 | static int | |
02f014d8 | 283 | ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct nf_queue_entry *e) |
1da177e4 LT |
284 | { |
285 | int diff; | |
286 | struct iphdr *user_iph = (struct iphdr *)v->payload; | |
e2b58a67 | 287 | struct sk_buff *nskb; |
1da177e4 LT |
288 | |
289 | if (v->data_len < sizeof(*user_iph)) | |
290 | return 0; | |
291 | diff = v->data_len - e->skb->len; | |
d8a585d7 PM |
292 | if (diff < 0) { |
293 | if (pskb_trim(e->skb, v->data_len)) | |
294 | return -ENOMEM; | |
295 | } else if (diff > 0) { | |
1da177e4 LT |
296 | if (v->data_len > 0xFFFF) |
297 | return -EINVAL; | |
298 | if (diff > skb_tailroom(e->skb)) { | |
e2b58a67 | 299 | nskb = skb_copy_expand(e->skb, 0, |
2ca7b0ac HX |
300 | diff - skb_tailroom(e->skb), |
301 | GFP_ATOMIC); | |
e2b58a67 | 302 | if (!nskb) { |
2ca7b0ac | 303 | printk(KERN_WARNING "ip_queue: error " |
e2b58a67 PM |
304 | "in mangle, dropping packet\n"); |
305 | return -ENOMEM; | |
1da177e4 | 306 | } |
e2b58a67 PM |
307 | kfree_skb(e->skb); |
308 | e->skb = nskb; | |
1da177e4 LT |
309 | } |
310 | skb_put(e->skb, diff); | |
311 | } | |
37d41879 | 312 | if (!skb_make_writable(e->skb, v->data_len)) |
1da177e4 | 313 | return -ENOMEM; |
27d7ff46 | 314 | skb_copy_to_linear_data(e->skb, v->payload, v->data_len); |
66a79a19 | 315 | e->skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 316 | |
1da177e4 LT |
317 | return 0; |
318 | } | |
319 | ||
1da177e4 LT |
320 | static int |
321 | ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len) | |
322 | { | |
02f014d8 | 323 | struct nf_queue_entry *entry; |
1da177e4 LT |
324 | |
325 | if (vmsg->value > NF_MAX_VERDICT) | |
326 | return -EINVAL; | |
327 | ||
95214092 | 328 | entry = ipq_find_dequeue_entry(vmsg->id); |
1da177e4 LT |
329 | if (entry == NULL) |
330 | return -ENOENT; | |
331 | else { | |
332 | int verdict = vmsg->value; | |
e905a9ed | 333 | |
1da177e4 LT |
334 | if (vmsg->data_len && vmsg->data_len == len) |
335 | if (ipq_mangle_ipv4(vmsg, entry) < 0) | |
336 | verdict = NF_DROP; | |
e905a9ed | 337 | |
4b3d15ef | 338 | nf_reinject(entry, verdict); |
1da177e4 LT |
339 | return 0; |
340 | } | |
341 | } | |
342 | ||
343 | static int | |
344 | ipq_set_mode(unsigned char mode, unsigned int range) | |
345 | { | |
346 | int status; | |
347 | ||
348 | write_lock_bh(&queue_lock); | |
349 | status = __ipq_set_mode(mode, range); | |
350 | write_unlock_bh(&queue_lock); | |
351 | return status; | |
352 | } | |
353 | ||
354 | static int | |
355 | ipq_receive_peer(struct ipq_peer_msg *pmsg, | |
e905a9ed | 356 | unsigned char type, unsigned int len) |
1da177e4 LT |
357 | { |
358 | int status = 0; | |
359 | ||
360 | if (len < sizeof(*pmsg)) | |
361 | return -EINVAL; | |
362 | ||
363 | switch (type) { | |
364 | case IPQM_MODE: | |
365 | status = ipq_set_mode(pmsg->msg.mode.value, | |
e905a9ed | 366 | pmsg->msg.mode.range); |
1da177e4 | 367 | break; |
e905a9ed | 368 | |
1da177e4 LT |
369 | case IPQM_VERDICT: |
370 | if (pmsg->msg.verdict.value > NF_MAX_VERDICT) | |
371 | status = -EINVAL; | |
372 | else | |
373 | status = ipq_set_verdict(&pmsg->msg.verdict, | |
e905a9ed | 374 | len - sizeof(*pmsg)); |
1da177e4 LT |
375 | break; |
376 | default: | |
377 | status = -EINVAL; | |
378 | } | |
379 | return status; | |
380 | } | |
381 | ||
382 | static int | |
02f014d8 | 383 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
1da177e4 | 384 | { |
02f014d8 PM |
385 | if (entry->indev) |
386 | if (entry->indev->ifindex == ifindex) | |
1da177e4 | 387 | return 1; |
02f014d8 PM |
388 | if (entry->outdev) |
389 | if (entry->outdev->ifindex == ifindex) | |
1da177e4 | 390 | return 1; |
ef47c6a7 PM |
391 | #ifdef CONFIG_BRIDGE_NETFILTER |
392 | if (entry->skb->nf_bridge) { | |
393 | if (entry->skb->nf_bridge->physindev && | |
394 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
395 | return 1; | |
396 | if (entry->skb->nf_bridge->physoutdev && | |
397 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
e905a9ed | 398 | return 1; |
ef47c6a7 PM |
399 | } |
400 | #endif | |
1da177e4 LT |
401 | return 0; |
402 | } | |
403 | ||
404 | static void | |
405 | ipq_dev_drop(int ifindex) | |
406 | { | |
95214092 | 407 | ipq_flush(dev_cmp, ifindex); |
1da177e4 LT |
408 | } |
409 | ||
410 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
411 | ||
412 | static inline void | |
cd40b7d3 | 413 | __ipq_rcv_skb(struct sk_buff *skb) |
1da177e4 LT |
414 | { |
415 | int status, type, pid, flags, nlmsglen, skblen; | |
416 | struct nlmsghdr *nlh; | |
417 | ||
418 | skblen = skb->len; | |
419 | if (skblen < sizeof(*nlh)) | |
420 | return; | |
421 | ||
b529ccf2 | 422 | nlh = nlmsg_hdr(skb); |
1da177e4 LT |
423 | nlmsglen = nlh->nlmsg_len; |
424 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) | |
425 | return; | |
426 | ||
427 | pid = nlh->nlmsg_pid; | |
428 | flags = nlh->nlmsg_flags; | |
e905a9ed | 429 | |
1da177e4 LT |
430 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) |
431 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 432 | |
1da177e4 LT |
433 | if (flags & MSG_TRUNC) |
434 | RCV_SKB_FAIL(-ECOMM); | |
e905a9ed | 435 | |
1da177e4 LT |
436 | type = nlh->nlmsg_type; |
437 | if (type < NLMSG_NOOP || type >= IPQM_MAX) | |
438 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 439 | |
1da177e4 LT |
440 | if (type <= IPQM_BASE) |
441 | return; | |
e905a9ed | 442 | |
c7bdb545 | 443 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
1da177e4 | 444 | RCV_SKB_FAIL(-EPERM); |
e905a9ed | 445 | |
1da177e4 | 446 | write_lock_bh(&queue_lock); |
e905a9ed | 447 | |
1da177e4 LT |
448 | if (peer_pid) { |
449 | if (peer_pid != pid) { | |
450 | write_unlock_bh(&queue_lock); | |
451 | RCV_SKB_FAIL(-EBUSY); | |
452 | } | |
453 | } else { | |
454 | net_enable_timestamp(); | |
455 | peer_pid = pid; | |
456 | } | |
e905a9ed | 457 | |
1da177e4 | 458 | write_unlock_bh(&queue_lock); |
e905a9ed | 459 | |
1da177e4 | 460 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, |
e905a9ed | 461 | nlmsglen - NLMSG_LENGTH(0)); |
1da177e4 LT |
462 | if (status < 0) |
463 | RCV_SKB_FAIL(status); | |
e905a9ed | 464 | |
1da177e4 LT |
465 | if (flags & NLM_F_ACK) |
466 | netlink_ack(skb, nlh, 0); | |
e905a9ed | 467 | return; |
1da177e4 LT |
468 | } |
469 | ||
470 | static void | |
cd40b7d3 | 471 | ipq_rcv_skb(struct sk_buff *skb) |
1da177e4 | 472 | { |
4a3e2f71 | 473 | mutex_lock(&ipqnl_mutex); |
cd40b7d3 | 474 | __ipq_rcv_skb(skb); |
4a3e2f71 | 475 | mutex_unlock(&ipqnl_mutex); |
1da177e4 LT |
476 | } |
477 | ||
478 | static int | |
479 | ipq_rcv_dev_event(struct notifier_block *this, | |
e905a9ed | 480 | unsigned long event, void *ptr) |
1da177e4 LT |
481 | { |
482 | struct net_device *dev = ptr; | |
483 | ||
c346dca1 | 484 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
485 | return NOTIFY_DONE; |
486 | ||
1da177e4 LT |
487 | /* Drop any packets associated with the downed device */ |
488 | if (event == NETDEV_DOWN) | |
489 | ipq_dev_drop(dev->ifindex); | |
490 | return NOTIFY_DONE; | |
491 | } | |
492 | ||
493 | static struct notifier_block ipq_dev_notifier = { | |
494 | .notifier_call = ipq_rcv_dev_event, | |
495 | }; | |
496 | ||
497 | static int | |
498 | ipq_rcv_nl_event(struct notifier_block *this, | |
e905a9ed | 499 | unsigned long event, void *ptr) |
1da177e4 LT |
500 | { |
501 | struct netlink_notify *n = ptr; | |
502 | ||
503 | if (event == NETLINK_URELEASE && | |
504 | n->protocol == NETLINK_FIREWALL && n->pid) { | |
505 | write_lock_bh(&queue_lock); | |
b4b51029 | 506 | if ((n->net == &init_net) && (n->pid == peer_pid)) |
1da177e4 LT |
507 | __ipq_reset(); |
508 | write_unlock_bh(&queue_lock); | |
509 | } | |
510 | return NOTIFY_DONE; | |
511 | } | |
512 | ||
513 | static struct notifier_block ipq_nl_notifier = { | |
514 | .notifier_call = ipq_rcv_nl_event, | |
515 | }; | |
516 | ||
c392a740 | 517 | #ifdef CONFIG_SYSCTL |
1da177e4 LT |
518 | static struct ctl_table_header *ipq_sysctl_header; |
519 | ||
520 | static ctl_table ipq_table[] = { | |
521 | { | |
522 | .ctl_name = NET_IPQ_QMAX, | |
523 | .procname = NET_IPQ_QMAX_NAME, | |
524 | .data = &queue_maxlen, | |
525 | .maxlen = sizeof(queue_maxlen), | |
526 | .mode = 0644, | |
527 | .proc_handler = proc_dointvec | |
528 | }, | |
e905a9ed | 529 | { .ctl_name = 0 } |
1da177e4 | 530 | }; |
c392a740 | 531 | #endif |
1da177e4 | 532 | |
c392a740 | 533 | #ifdef CONFIG_PROC_FS |
7351a22a | 534 | static int ip_queue_show(struct seq_file *m, void *v) |
1da177e4 | 535 | { |
1da177e4 | 536 | read_lock_bh(&queue_lock); |
e905a9ed | 537 | |
7351a22a | 538 | seq_printf(m, |
e905a9ed YH |
539 | "Peer PID : %d\n" |
540 | "Copy mode : %hu\n" | |
541 | "Copy range : %u\n" | |
542 | "Queue length : %u\n" | |
543 | "Queue max. length : %u\n" | |
1da177e4 LT |
544 | "Queue dropped : %u\n" |
545 | "Netlink dropped : %u\n", | |
e905a9ed YH |
546 | peer_pid, |
547 | copy_mode, | |
548 | copy_range, | |
549 | queue_total, | |
550 | queue_maxlen, | |
1da177e4 LT |
551 | queue_dropped, |
552 | queue_user_dropped); | |
553 | ||
554 | read_unlock_bh(&queue_lock); | |
7351a22a AD |
555 | return 0; |
556 | } | |
e905a9ed | 557 | |
7351a22a AD |
558 | static int ip_queue_open(struct inode *inode, struct file *file) |
559 | { | |
560 | return single_open(file, ip_queue_show, NULL); | |
1da177e4 | 561 | } |
7351a22a AD |
562 | |
563 | static const struct file_operations ip_queue_proc_fops = { | |
564 | .open = ip_queue_open, | |
565 | .read = seq_read, | |
566 | .llseek = seq_lseek, | |
567 | .release = single_release, | |
568 | .owner = THIS_MODULE, | |
569 | }; | |
c392a740 | 570 | #endif |
1da177e4 | 571 | |
e3ac5298 | 572 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
573 | .name = "ip_queue", |
574 | .outfn = &ipq_enqueue_packet, | |
575 | }; | |
576 | ||
32292a7f | 577 | static int __init ip_queue_init(void) |
1da177e4 LT |
578 | { |
579 | int status = -ENOMEM; | |
c392a740 | 580 | struct proc_dir_entry *proc __maybe_unused; |
e905a9ed | 581 | |
1da177e4 | 582 | netlink_register_notifier(&ipq_nl_notifier); |
b4b51029 | 583 | ipqnl = netlink_kernel_create(&init_net, NETLINK_FIREWALL, 0, |
cd40b7d3 | 584 | ipq_rcv_skb, NULL, THIS_MODULE); |
1da177e4 LT |
585 | if (ipqnl == NULL) { |
586 | printk(KERN_ERR "ip_queue: failed to create netlink socket\n"); | |
587 | goto cleanup_netlink_notifier; | |
588 | } | |
589 | ||
c392a740 | 590 | #ifdef CONFIG_PROC_FS |
8eeee8b1 DL |
591 | proc = proc_create(IPQ_PROC_FS_NAME, 0, init_net.proc_net, |
592 | &ip_queue_proc_fops); | |
593 | if (!proc) { | |
1da177e4 LT |
594 | printk(KERN_ERR "ip_queue: failed to create proc entry\n"); |
595 | goto cleanup_ipqnl; | |
596 | } | |
c392a740 | 597 | #endif |
1da177e4 | 598 | register_netdevice_notifier(&ipq_dev_notifier); |
c392a740 | 599 | #ifdef CONFIG_SYSCTL |
3d7cc2ba | 600 | ipq_sysctl_header = register_sysctl_paths(net_ipv4_ctl_path, ipq_table); |
c392a740 | 601 | #endif |
bbd86b9f | 602 | status = nf_register_queue_handler(PF_INET, &nfqh); |
1da177e4 LT |
603 | if (status < 0) { |
604 | printk(KERN_ERR "ip_queue: failed to register queue handler\n"); | |
605 | goto cleanup_sysctl; | |
606 | } | |
607 | return status; | |
608 | ||
1da177e4 | 609 | cleanup_sysctl: |
c392a740 | 610 | #ifdef CONFIG_SYSCTL |
1da177e4 | 611 | unregister_sysctl_table(ipq_sysctl_header); |
c392a740 | 612 | #endif |
1da177e4 | 613 | unregister_netdevice_notifier(&ipq_dev_notifier); |
457c4cbc | 614 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
c392a740 | 615 | cleanup_ipqnl: __maybe_unused |
b7c6ba6e | 616 | netlink_kernel_release(ipqnl); |
4a3e2f71 AV |
617 | mutex_lock(&ipqnl_mutex); |
618 | mutex_unlock(&ipqnl_mutex); | |
e905a9ed | 619 | |
1da177e4 LT |
620 | cleanup_netlink_notifier: |
621 | netlink_unregister_notifier(&ipq_nl_notifier); | |
622 | return status; | |
623 | } | |
624 | ||
65b4b4e8 | 625 | static void __exit ip_queue_fini(void) |
1da177e4 | 626 | { |
32292a7f PM |
627 | nf_unregister_queue_handlers(&nfqh); |
628 | synchronize_net(); | |
95214092 | 629 | ipq_flush(NULL, 0); |
32292a7f | 630 | |
c392a740 | 631 | #ifdef CONFIG_SYSCTL |
32292a7f | 632 | unregister_sysctl_table(ipq_sysctl_header); |
c392a740 | 633 | #endif |
32292a7f | 634 | unregister_netdevice_notifier(&ipq_dev_notifier); |
457c4cbc | 635 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
32292a7f | 636 | |
b7c6ba6e | 637 | netlink_kernel_release(ipqnl); |
32292a7f PM |
638 | mutex_lock(&ipqnl_mutex); |
639 | mutex_unlock(&ipqnl_mutex); | |
640 | ||
641 | netlink_unregister_notifier(&ipq_nl_notifier); | |
1da177e4 LT |
642 | } |
643 | ||
644 | MODULE_DESCRIPTION("IPv4 packet queue handler"); | |
645 | MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>"); | |
646 | MODULE_LICENSE("GPL"); | |
647 | ||
65b4b4e8 AM |
648 | module_init(ip_queue_init); |
649 | module_exit(ip_queue_fini); |