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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. | |
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> |
95ba434f | 27 | #include <linux/net.h> |
4a3e2f71 | 28 | #include <linux/mutex.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
457c4cbc | 30 | #include <net/net_namespace.h> |
1da177e4 LT |
31 | #include <net/sock.h> |
32 | #include <net/route.h> | |
c01cd429 | 33 | #include <net/netfilter/nf_queue.h> |
3d7cc2ba | 34 | #include <net/ip.h> |
1da177e4 LT |
35 | |
36 | #define IPQ_QMAX_DEFAULT 1024 | |
37 | #define IPQ_PROC_FS_NAME "ip_queue" | |
38 | #define NET_IPQ_QMAX 2088 | |
39 | #define NET_IPQ_QMAX_NAME "ip_queue_maxlen" | |
40 | ||
02f014d8 | 41 | typedef int (*ipq_cmpfn)(struct nf_queue_entry *, unsigned long); |
1da177e4 | 42 | |
1192e403 | 43 | static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE; |
94aec08e | 44 | static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT; |
1da177e4 | 45 | static DEFINE_RWLOCK(queue_lock); |
1192e403 BH |
46 | static int peer_pid __read_mostly; |
47 | static unsigned int copy_range __read_mostly; | |
1da177e4 LT |
48 | static unsigned int queue_total; |
49 | static unsigned int queue_dropped = 0; | |
50 | static unsigned int queue_user_dropped = 0; | |
1192e403 | 51 | static struct sock *ipqnl __read_mostly; |
1da177e4 | 52 | static LIST_HEAD(queue_list); |
4a3e2f71 | 53 | static DEFINE_MUTEX(ipqnl_mutex); |
1da177e4 | 54 | |
1da177e4 | 55 | static inline void |
02f014d8 | 56 | __ipq_enqueue_entry(struct nf_queue_entry *entry) |
1da177e4 | 57 | { |
0ac41e81 | 58 | list_add_tail(&entry->list, &queue_list); |
1da177e4 LT |
59 | queue_total++; |
60 | } | |
61 | ||
1da177e4 LT |
62 | static inline int |
63 | __ipq_set_mode(unsigned char mode, unsigned int range) | |
64 | { | |
65 | int status = 0; | |
e905a9ed | 66 | |
1da177e4 LT |
67 | switch(mode) { |
68 | case IPQ_COPY_NONE: | |
69 | case IPQ_COPY_META: | |
70 | copy_mode = mode; | |
71 | copy_range = 0; | |
72 | break; | |
e905a9ed | 73 | |
1da177e4 LT |
74 | case IPQ_COPY_PACKET: |
75 | copy_mode = mode; | |
76 | copy_range = range; | |
77 | if (copy_range > 0xFFFF) | |
78 | copy_range = 0xFFFF; | |
79 | break; | |
e905a9ed | 80 | |
1da177e4 LT |
81 | default: |
82 | status = -EINVAL; | |
83 | ||
84 | } | |
85 | return status; | |
86 | } | |
87 | ||
95214092 PM |
88 | static void __ipq_flush(ipq_cmpfn cmpfn, unsigned long data); |
89 | ||
1da177e4 LT |
90 | static inline void |
91 | __ipq_reset(void) | |
92 | { | |
93 | peer_pid = 0; | |
94 | net_disable_timestamp(); | |
95 | __ipq_set_mode(IPQ_COPY_NONE, 0); | |
95214092 | 96 | __ipq_flush(NULL, 0); |
1da177e4 LT |
97 | } |
98 | ||
02f014d8 | 99 | static struct nf_queue_entry * |
95214092 | 100 | ipq_find_dequeue_entry(unsigned long id) |
1da177e4 | 101 | { |
02f014d8 | 102 | struct nf_queue_entry *entry = NULL, *i; |
e905a9ed | 103 | |
1da177e4 | 104 | write_lock_bh(&queue_lock); |
95214092 PM |
105 | |
106 | list_for_each_entry(i, &queue_list, list) { | |
107 | if ((unsigned long)i == id) { | |
108 | entry = i; | |
109 | break; | |
110 | } | |
111 | } | |
112 | ||
113 | if (entry) { | |
114 | list_del(&entry->list); | |
115 | queue_total--; | |
116 | } | |
117 | ||
1da177e4 LT |
118 | write_unlock_bh(&queue_lock); |
119 | return entry; | |
120 | } | |
121 | ||
122 | static void | |
95214092 PM |
123 | __ipq_flush(ipq_cmpfn cmpfn, unsigned long data) |
124 | { | |
02f014d8 | 125 | struct nf_queue_entry *entry, *next; |
95214092 PM |
126 | |
127 | list_for_each_entry_safe(entry, next, &queue_list, list) { | |
128 | if (!cmpfn || cmpfn(entry, data)) { | |
129 | list_del(&entry->list); | |
130 | queue_total--; | |
4b3d15ef | 131 | nf_reinject(entry, NF_DROP); |
95214092 PM |
132 | } |
133 | } | |
134 | } | |
135 | ||
136 | static void | |
137 | ipq_flush(ipq_cmpfn cmpfn, unsigned long data) | |
1da177e4 LT |
138 | { |
139 | write_lock_bh(&queue_lock); | |
95214092 | 140 | __ipq_flush(cmpfn, data); |
1da177e4 LT |
141 | write_unlock_bh(&queue_lock); |
142 | } | |
143 | ||
144 | static struct sk_buff * | |
02f014d8 | 145 | ipq_build_packet_message(struct nf_queue_entry *entry, int *errp) |
1da177e4 | 146 | { |
27a884dc | 147 | sk_buff_data_t old_tail; |
1da177e4 LT |
148 | size_t size = 0; |
149 | size_t data_len = 0; | |
150 | struct sk_buff *skb; | |
151 | struct ipq_packet_msg *pmsg; | |
152 | struct nlmsghdr *nlh; | |
b7aa0bf7 | 153 | struct timeval tv; |
1da177e4 LT |
154 | |
155 | read_lock_bh(&queue_lock); | |
e905a9ed | 156 | |
1da177e4 LT |
157 | switch (copy_mode) { |
158 | case IPQ_COPY_META: | |
159 | case IPQ_COPY_NONE: | |
160 | size = NLMSG_SPACE(sizeof(*pmsg)); | |
1da177e4 | 161 | break; |
e905a9ed | 162 | |
1da177e4 | 163 | case IPQ_COPY_PACKET: |
84fa7933 PM |
164 | if ((entry->skb->ip_summed == CHECKSUM_PARTIAL || |
165 | entry->skb->ip_summed == CHECKSUM_COMPLETE) && | |
166 | (*errp = skb_checksum_help(entry->skb))) { | |
66a79a19 PM |
167 | read_unlock_bh(&queue_lock); |
168 | return NULL; | |
169 | } | |
1da177e4 LT |
170 | if (copy_range == 0 || copy_range > entry->skb->len) |
171 | data_len = entry->skb->len; | |
172 | else | |
173 | data_len = copy_range; | |
e905a9ed | 174 | |
1da177e4 LT |
175 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); |
176 | break; | |
e905a9ed | 177 | |
1da177e4 LT |
178 | default: |
179 | *errp = -EINVAL; | |
180 | read_unlock_bh(&queue_lock); | |
181 | return NULL; | |
182 | } | |
183 | ||
184 | read_unlock_bh(&queue_lock); | |
185 | ||
186 | skb = alloc_skb(size, GFP_ATOMIC); | |
187 | if (!skb) | |
188 | goto nlmsg_failure; | |
e905a9ed | 189 | |
27a884dc | 190 | old_tail = skb->tail; |
1da177e4 LT |
191 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); |
192 | pmsg = NLMSG_DATA(nlh); | |
193 | memset(pmsg, 0, sizeof(*pmsg)); | |
194 | ||
195 | pmsg->packet_id = (unsigned long )entry; | |
196 | pmsg->data_len = data_len; | |
b7aa0bf7 ED |
197 | tv = ktime_to_timeval(entry->skb->tstamp); |
198 | pmsg->timestamp_sec = tv.tv_sec; | |
199 | pmsg->timestamp_usec = tv.tv_usec; | |
82e91ffe | 200 | pmsg->mark = entry->skb->mark; |
02f014d8 | 201 | pmsg->hook = entry->hook; |
1da177e4 | 202 | pmsg->hw_protocol = entry->skb->protocol; |
e905a9ed | 203 | |
02f014d8 PM |
204 | if (entry->indev) |
205 | strcpy(pmsg->indev_name, entry->indev->name); | |
1da177e4 LT |
206 | else |
207 | pmsg->indev_name[0] = '\0'; | |
e905a9ed | 208 | |
02f014d8 PM |
209 | if (entry->outdev) |
210 | strcpy(pmsg->outdev_name, entry->outdev->name); | |
1da177e4 LT |
211 | else |
212 | pmsg->outdev_name[0] = '\0'; | |
e905a9ed | 213 | |
02f014d8 | 214 | if (entry->indev && entry->skb->dev) { |
1da177e4 | 215 | pmsg->hw_type = entry->skb->dev->type; |
b95cce35 SH |
216 | pmsg->hw_addrlen = dev_parse_header(entry->skb, |
217 | pmsg->hw_addr); | |
1da177e4 | 218 | } |
e905a9ed | 219 | |
1da177e4 LT |
220 | if (data_len) |
221 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) | |
222 | BUG(); | |
e905a9ed | 223 | |
1da177e4 LT |
224 | nlh->nlmsg_len = skb->tail - old_tail; |
225 | return skb; | |
226 | ||
227 | nlmsg_failure: | |
1da177e4 LT |
228 | *errp = -EINVAL; |
229 | printk(KERN_ERR "ip_queue: error creating packet message\n"); | |
230 | return NULL; | |
231 | } | |
232 | ||
233 | static int | |
02f014d8 | 234 | ipq_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
1da177e4 LT |
235 | { |
236 | int status = -EINVAL; | |
237 | struct sk_buff *nskb; | |
1da177e4 LT |
238 | |
239 | if (copy_mode == IPQ_COPY_NONE) | |
240 | return -EAGAIN; | |
241 | ||
1da177e4 LT |
242 | nskb = ipq_build_packet_message(entry, &status); |
243 | if (nskb == NULL) | |
02f014d8 | 244 | return status; |
e905a9ed | 245 | |
1da177e4 | 246 | write_lock_bh(&queue_lock); |
e905a9ed | 247 | |
1da177e4 | 248 | if (!peer_pid) |
e905a9ed | 249 | goto err_out_free_nskb; |
1da177e4 LT |
250 | |
251 | if (queue_total >= queue_maxlen) { | |
e905a9ed | 252 | queue_dropped++; |
1da177e4 LT |
253 | status = -ENOSPC; |
254 | if (net_ratelimit()) | |
e905a9ed | 255 | printk (KERN_WARNING "ip_queue: full at %d entries, " |
1da177e4 LT |
256 | "dropping packets(s). Dropped: %d\n", queue_total, |
257 | queue_dropped); | |
258 | goto err_out_free_nskb; | |
259 | } | |
260 | ||
e905a9ed | 261 | /* netlink_unicast will either free the nskb or attach it to a socket */ |
1da177e4 LT |
262 | status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT); |
263 | if (status < 0) { | |
e905a9ed | 264 | queue_user_dropped++; |
1da177e4 LT |
265 | goto err_out_unlock; |
266 | } | |
267 | ||
268 | __ipq_enqueue_entry(entry); | |
269 | ||
270 | write_unlock_bh(&queue_lock); | |
271 | return status; | |
272 | ||
273 | err_out_free_nskb: | |
e905a9ed YH |
274 | kfree_skb(nskb); |
275 | ||
1da177e4 LT |
276 | err_out_unlock: |
277 | write_unlock_bh(&queue_lock); | |
1da177e4 LT |
278 | return status; |
279 | } | |
280 | ||
281 | static int | |
02f014d8 | 282 | ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct nf_queue_entry *e) |
1da177e4 LT |
283 | { |
284 | int diff; | |
285 | struct iphdr *user_iph = (struct iphdr *)v->payload; | |
e2b58a67 | 286 | struct sk_buff *nskb; |
1da177e4 LT |
287 | |
288 | if (v->data_len < sizeof(*user_iph)) | |
289 | return 0; | |
290 | diff = v->data_len - e->skb->len; | |
d8a585d7 PM |
291 | if (diff < 0) { |
292 | if (pskb_trim(e->skb, v->data_len)) | |
293 | return -ENOMEM; | |
294 | } else if (diff > 0) { | |
1da177e4 LT |
295 | if (v->data_len > 0xFFFF) |
296 | return -EINVAL; | |
297 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
298 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
299 | diff, GFP_ATOMIC); | |
e2b58a67 | 300 | if (!nskb) { |
2ca7b0ac | 301 | printk(KERN_WARNING "ip_queue: error " |
e2b58a67 PM |
302 | "in mangle, dropping packet\n"); |
303 | return -ENOMEM; | |
1da177e4 | 304 | } |
e2b58a67 PM |
305 | kfree_skb(e->skb); |
306 | e->skb = nskb; | |
1da177e4 LT |
307 | } |
308 | skb_put(e->skb, diff); | |
309 | } | |
37d41879 | 310 | if (!skb_make_writable(e->skb, v->data_len)) |
1da177e4 | 311 | return -ENOMEM; |
27d7ff46 | 312 | skb_copy_to_linear_data(e->skb, v->payload, v->data_len); |
66a79a19 | 313 | e->skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 314 | |
1da177e4 LT |
315 | return 0; |
316 | } | |
317 | ||
1da177e4 LT |
318 | static int |
319 | ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len) | |
320 | { | |
02f014d8 | 321 | struct nf_queue_entry *entry; |
1da177e4 LT |
322 | |
323 | if (vmsg->value > NF_MAX_VERDICT) | |
324 | return -EINVAL; | |
325 | ||
95214092 | 326 | entry = ipq_find_dequeue_entry(vmsg->id); |
1da177e4 LT |
327 | if (entry == NULL) |
328 | return -ENOENT; | |
329 | else { | |
330 | int verdict = vmsg->value; | |
e905a9ed | 331 | |
1da177e4 LT |
332 | if (vmsg->data_len && vmsg->data_len == len) |
333 | if (ipq_mangle_ipv4(vmsg, entry) < 0) | |
334 | verdict = NF_DROP; | |
e905a9ed | 335 | |
4b3d15ef | 336 | nf_reinject(entry, verdict); |
1da177e4 LT |
337 | return 0; |
338 | } | |
339 | } | |
340 | ||
341 | static int | |
342 | ipq_set_mode(unsigned char mode, unsigned int range) | |
343 | { | |
344 | int status; | |
345 | ||
346 | write_lock_bh(&queue_lock); | |
347 | status = __ipq_set_mode(mode, range); | |
348 | write_unlock_bh(&queue_lock); | |
349 | return status; | |
350 | } | |
351 | ||
352 | static int | |
353 | ipq_receive_peer(struct ipq_peer_msg *pmsg, | |
e905a9ed | 354 | unsigned char type, unsigned int len) |
1da177e4 LT |
355 | { |
356 | int status = 0; | |
357 | ||
358 | if (len < sizeof(*pmsg)) | |
359 | return -EINVAL; | |
360 | ||
361 | switch (type) { | |
362 | case IPQM_MODE: | |
363 | status = ipq_set_mode(pmsg->msg.mode.value, | |
e905a9ed | 364 | pmsg->msg.mode.range); |
1da177e4 | 365 | break; |
e905a9ed | 366 | |
1da177e4 LT |
367 | case IPQM_VERDICT: |
368 | if (pmsg->msg.verdict.value > NF_MAX_VERDICT) | |
369 | status = -EINVAL; | |
370 | else | |
371 | status = ipq_set_verdict(&pmsg->msg.verdict, | |
e905a9ed | 372 | len - sizeof(*pmsg)); |
1da177e4 LT |
373 | break; |
374 | default: | |
375 | status = -EINVAL; | |
376 | } | |
377 | return status; | |
378 | } | |
379 | ||
380 | static int | |
02f014d8 | 381 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
1da177e4 | 382 | { |
02f014d8 PM |
383 | if (entry->indev) |
384 | if (entry->indev->ifindex == ifindex) | |
1da177e4 | 385 | return 1; |
02f014d8 PM |
386 | if (entry->outdev) |
387 | if (entry->outdev->ifindex == ifindex) | |
1da177e4 | 388 | return 1; |
ef47c6a7 PM |
389 | #ifdef CONFIG_BRIDGE_NETFILTER |
390 | if (entry->skb->nf_bridge) { | |
391 | if (entry->skb->nf_bridge->physindev && | |
392 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
393 | return 1; | |
394 | if (entry->skb->nf_bridge->physoutdev && | |
395 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
e905a9ed | 396 | return 1; |
ef47c6a7 PM |
397 | } |
398 | #endif | |
1da177e4 LT |
399 | return 0; |
400 | } | |
401 | ||
402 | static void | |
403 | ipq_dev_drop(int ifindex) | |
404 | { | |
95214092 | 405 | ipq_flush(dev_cmp, ifindex); |
1da177e4 LT |
406 | } |
407 | ||
408 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
409 | ||
410 | static inline void | |
cd40b7d3 | 411 | __ipq_rcv_skb(struct sk_buff *skb) |
1da177e4 LT |
412 | { |
413 | int status, type, pid, flags, nlmsglen, skblen; | |
414 | struct nlmsghdr *nlh; | |
415 | ||
416 | skblen = skb->len; | |
417 | if (skblen < sizeof(*nlh)) | |
418 | return; | |
419 | ||
b529ccf2 | 420 | nlh = nlmsg_hdr(skb); |
1da177e4 LT |
421 | nlmsglen = nlh->nlmsg_len; |
422 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) | |
423 | return; | |
424 | ||
425 | pid = nlh->nlmsg_pid; | |
426 | flags = nlh->nlmsg_flags; | |
e905a9ed | 427 | |
1da177e4 LT |
428 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) |
429 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 430 | |
1da177e4 LT |
431 | if (flags & MSG_TRUNC) |
432 | RCV_SKB_FAIL(-ECOMM); | |
e905a9ed | 433 | |
1da177e4 LT |
434 | type = nlh->nlmsg_type; |
435 | if (type < NLMSG_NOOP || type >= IPQM_MAX) | |
436 | RCV_SKB_FAIL(-EINVAL); | |
e905a9ed | 437 | |
1da177e4 LT |
438 | if (type <= IPQM_BASE) |
439 | return; | |
e905a9ed | 440 | |
c7bdb545 | 441 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
1da177e4 | 442 | RCV_SKB_FAIL(-EPERM); |
e905a9ed | 443 | |
1da177e4 | 444 | write_lock_bh(&queue_lock); |
e905a9ed | 445 | |
1da177e4 LT |
446 | if (peer_pid) { |
447 | if (peer_pid != pid) { | |
448 | write_unlock_bh(&queue_lock); | |
449 | RCV_SKB_FAIL(-EBUSY); | |
450 | } | |
451 | } else { | |
452 | net_enable_timestamp(); | |
453 | peer_pid = pid; | |
454 | } | |
e905a9ed | 455 | |
1da177e4 | 456 | write_unlock_bh(&queue_lock); |
e905a9ed | 457 | |
1da177e4 | 458 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, |
e905a9ed | 459 | nlmsglen - NLMSG_LENGTH(0)); |
1da177e4 LT |
460 | if (status < 0) |
461 | RCV_SKB_FAIL(status); | |
e905a9ed | 462 | |
1da177e4 LT |
463 | if (flags & NLM_F_ACK) |
464 | netlink_ack(skb, nlh, 0); | |
e905a9ed | 465 | return; |
1da177e4 LT |
466 | } |
467 | ||
468 | static void | |
cd40b7d3 | 469 | ipq_rcv_skb(struct sk_buff *skb) |
1da177e4 | 470 | { |
4a3e2f71 | 471 | mutex_lock(&ipqnl_mutex); |
cd40b7d3 | 472 | __ipq_rcv_skb(skb); |
4a3e2f71 | 473 | mutex_unlock(&ipqnl_mutex); |
1da177e4 LT |
474 | } |
475 | ||
476 | static int | |
477 | ipq_rcv_dev_event(struct notifier_block *this, | |
e905a9ed | 478 | unsigned long event, void *ptr) |
1da177e4 LT |
479 | { |
480 | struct net_device *dev = ptr; | |
481 | ||
721499e8 | 482 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
483 | return NOTIFY_DONE; |
484 | ||
1da177e4 LT |
485 | /* Drop any packets associated with the downed device */ |
486 | if (event == NETDEV_DOWN) | |
487 | ipq_dev_drop(dev->ifindex); | |
488 | return NOTIFY_DONE; | |
489 | } | |
490 | ||
491 | static struct notifier_block ipq_dev_notifier = { | |
492 | .notifier_call = ipq_rcv_dev_event, | |
493 | }; | |
494 | ||
495 | static int | |
496 | ipq_rcv_nl_event(struct notifier_block *this, | |
e905a9ed | 497 | unsigned long event, void *ptr) |
1da177e4 LT |
498 | { |
499 | struct netlink_notify *n = ptr; | |
500 | ||
dee5817e | 501 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_FIREWALL) { |
1da177e4 | 502 | write_lock_bh(&queue_lock); |
09ad9bc7 | 503 | if ((net_eq(n->net, &init_net)) && (n->pid == peer_pid)) |
1da177e4 LT |
504 | __ipq_reset(); |
505 | write_unlock_bh(&queue_lock); | |
506 | } | |
507 | return NOTIFY_DONE; | |
508 | } | |
509 | ||
510 | static struct notifier_block ipq_nl_notifier = { | |
511 | .notifier_call = ipq_rcv_nl_event, | |
512 | }; | |
513 | ||
c392a740 | 514 | #ifdef CONFIG_SYSCTL |
1da177e4 LT |
515 | static struct ctl_table_header *ipq_sysctl_header; |
516 | ||
517 | static ctl_table ipq_table[] = { | |
518 | { | |
1da177e4 LT |
519 | .procname = NET_IPQ_QMAX_NAME, |
520 | .data = &queue_maxlen, | |
521 | .maxlen = sizeof(queue_maxlen), | |
522 | .mode = 0644, | |
523 | .proc_handler = proc_dointvec | |
524 | }, | |
f8572d8f | 525 | { } |
1da177e4 | 526 | }; |
c392a740 | 527 | #endif |
1da177e4 | 528 | |
c392a740 | 529 | #ifdef CONFIG_PROC_FS |
7351a22a | 530 | static int ip_queue_show(struct seq_file *m, void *v) |
1da177e4 | 531 | { |
1da177e4 | 532 | read_lock_bh(&queue_lock); |
e905a9ed | 533 | |
7351a22a | 534 | seq_printf(m, |
e905a9ed YH |
535 | "Peer PID : %d\n" |
536 | "Copy mode : %hu\n" | |
537 | "Copy range : %u\n" | |
538 | "Queue length : %u\n" | |
539 | "Queue max. length : %u\n" | |
1da177e4 LT |
540 | "Queue dropped : %u\n" |
541 | "Netlink dropped : %u\n", | |
e905a9ed YH |
542 | peer_pid, |
543 | copy_mode, | |
544 | copy_range, | |
545 | queue_total, | |
546 | queue_maxlen, | |
1da177e4 LT |
547 | queue_dropped, |
548 | queue_user_dropped); | |
549 | ||
550 | read_unlock_bh(&queue_lock); | |
7351a22a AD |
551 | return 0; |
552 | } | |
e905a9ed | 553 | |
7351a22a AD |
554 | static int ip_queue_open(struct inode *inode, struct file *file) |
555 | { | |
556 | return single_open(file, ip_queue_show, NULL); | |
1da177e4 | 557 | } |
7351a22a AD |
558 | |
559 | static const struct file_operations ip_queue_proc_fops = { | |
560 | .open = ip_queue_open, | |
561 | .read = seq_read, | |
562 | .llseek = seq_lseek, | |
563 | .release = single_release, | |
564 | .owner = THIS_MODULE, | |
565 | }; | |
c392a740 | 566 | #endif |
1da177e4 | 567 | |
e3ac5298 | 568 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
569 | .name = "ip_queue", |
570 | .outfn = &ipq_enqueue_packet, | |
571 | }; | |
572 | ||
32292a7f | 573 | static int __init ip_queue_init(void) |
1da177e4 LT |
574 | { |
575 | int status = -ENOMEM; | |
c392a740 | 576 | struct proc_dir_entry *proc __maybe_unused; |
e905a9ed | 577 | |
1da177e4 | 578 | netlink_register_notifier(&ipq_nl_notifier); |
b4b51029 | 579 | ipqnl = netlink_kernel_create(&init_net, NETLINK_FIREWALL, 0, |
cd40b7d3 | 580 | ipq_rcv_skb, NULL, THIS_MODULE); |
1da177e4 LT |
581 | if (ipqnl == NULL) { |
582 | printk(KERN_ERR "ip_queue: failed to create netlink socket\n"); | |
583 | goto cleanup_netlink_notifier; | |
584 | } | |
585 | ||
c392a740 | 586 | #ifdef CONFIG_PROC_FS |
8eeee8b1 DL |
587 | proc = proc_create(IPQ_PROC_FS_NAME, 0, init_net.proc_net, |
588 | &ip_queue_proc_fops); | |
589 | if (!proc) { | |
1da177e4 LT |
590 | printk(KERN_ERR "ip_queue: failed to create proc entry\n"); |
591 | goto cleanup_ipqnl; | |
592 | } | |
c392a740 | 593 | #endif |
1da177e4 | 594 | register_netdevice_notifier(&ipq_dev_notifier); |
c392a740 | 595 | #ifdef CONFIG_SYSCTL |
3d7cc2ba | 596 | ipq_sysctl_header = register_sysctl_paths(net_ipv4_ctl_path, ipq_table); |
c392a740 | 597 | #endif |
4b1e27e9 | 598 | status = nf_register_queue_handler(NFPROTO_IPV4, &nfqh); |
1da177e4 LT |
599 | if (status < 0) { |
600 | printk(KERN_ERR "ip_queue: failed to register queue handler\n"); | |
601 | goto cleanup_sysctl; | |
602 | } | |
603 | return status; | |
604 | ||
1da177e4 | 605 | cleanup_sysctl: |
c392a740 | 606 | #ifdef CONFIG_SYSCTL |
1da177e4 | 607 | unregister_sysctl_table(ipq_sysctl_header); |
c392a740 | 608 | #endif |
1da177e4 | 609 | unregister_netdevice_notifier(&ipq_dev_notifier); |
457c4cbc | 610 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
c392a740 | 611 | cleanup_ipqnl: __maybe_unused |
b7c6ba6e | 612 | netlink_kernel_release(ipqnl); |
4a3e2f71 AV |
613 | mutex_lock(&ipqnl_mutex); |
614 | mutex_unlock(&ipqnl_mutex); | |
e905a9ed | 615 | |
1da177e4 LT |
616 | cleanup_netlink_notifier: |
617 | netlink_unregister_notifier(&ipq_nl_notifier); | |
618 | return status; | |
619 | } | |
620 | ||
65b4b4e8 | 621 | static void __exit ip_queue_fini(void) |
1da177e4 | 622 | { |
32292a7f | 623 | nf_unregister_queue_handlers(&nfqh); |
9481721b | 624 | |
95214092 | 625 | ipq_flush(NULL, 0); |
32292a7f | 626 | |
c392a740 | 627 | #ifdef CONFIG_SYSCTL |
32292a7f | 628 | unregister_sysctl_table(ipq_sysctl_header); |
c392a740 | 629 | #endif |
32292a7f | 630 | unregister_netdevice_notifier(&ipq_dev_notifier); |
457c4cbc | 631 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
32292a7f | 632 | |
b7c6ba6e | 633 | netlink_kernel_release(ipqnl); |
32292a7f PM |
634 | mutex_lock(&ipqnl_mutex); |
635 | mutex_unlock(&ipqnl_mutex); | |
636 | ||
637 | netlink_unregister_notifier(&ipq_nl_notifier); | |
1da177e4 LT |
638 | } |
639 | ||
640 | MODULE_DESCRIPTION("IPv4 packet queue handler"); | |
641 | MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>"); | |
642 | MODULE_LICENSE("GPL"); | |
95ba434f | 643 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_FIREWALL); |
1da177e4 | 644 | |
65b4b4e8 AM |
645 | module_init(ip_queue_init); |
646 | module_exit(ip_queue_fini); |