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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This is a module which is used for queueing IPv6 packets and | |
3 | * communicating with userspace via netlink. | |
4 | * | |
5 | * (C) 2001 Fernando Anton, this code is GPL. | |
6 | * IPv64 Project - Work based in IPv64 draft by Arturo Azcorra. | |
7 | * Universidad Carlos III de Madrid - Leganes (Madrid) - Spain | |
8 | * Universidad Politecnica de Alcala de Henares - Alcala de H. (Madrid) - Spain | |
9 | * email: fanton@it.uc3m.es | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
1da177e4 LT |
14 | */ |
15 | #include <linux/module.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/ipv6.h> | |
19 | #include <linux/notifier.h> | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/netfilter.h> | |
22 | #include <linux/netlink.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/sysctl.h> | |
25 | #include <linux/proc_fs.h> | |
7351a22a | 26 | #include <linux/seq_file.h> |
4a3e2f71 | 27 | #include <linux/mutex.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
457c4cbc | 29 | #include <net/net_namespace.h> |
1da177e4 LT |
30 | #include <net/sock.h> |
31 | #include <net/ipv6.h> | |
32 | #include <net/ip6_route.h> | |
c01cd429 | 33 | #include <net/netfilter/nf_queue.h> |
1da177e4 LT |
34 | #include <linux/netfilter_ipv4/ip_queue.h> |
35 | #include <linux/netfilter_ipv4/ip_tables.h> | |
36 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
37 | ||
38 | #define IPQ_QMAX_DEFAULT 1024 | |
39 | #define IPQ_PROC_FS_NAME "ip6_queue" | |
1da177e4 LT |
40 | #define NET_IPQ_QMAX_NAME "ip6_queue_maxlen" |
41 | ||
02f014d8 | 42 | typedef int (*ipq_cmpfn)(struct nf_queue_entry *, unsigned long); |
1da177e4 | 43 | |
1192e403 | 44 | static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE; |
94aec08e | 45 | static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT; |
1da177e4 | 46 | static DEFINE_RWLOCK(queue_lock); |
1192e403 BH |
47 | static int peer_pid __read_mostly; |
48 | static unsigned int copy_range __read_mostly; | |
1da177e4 LT |
49 | static unsigned int queue_total; |
50 | static unsigned int queue_dropped = 0; | |
51 | static unsigned int queue_user_dropped = 0; | |
1192e403 | 52 | static struct sock *ipqnl __read_mostly; |
1da177e4 | 53 | static LIST_HEAD(queue_list); |
4a3e2f71 | 54 | static DEFINE_MUTEX(ipqnl_mutex); |
1da177e4 | 55 | |
1da177e4 | 56 | static inline void |
02f014d8 | 57 | __ipq_enqueue_entry(struct nf_queue_entry *entry) |
1da177e4 | 58 | { |
0ac41e81 | 59 | list_add_tail(&entry->list, &queue_list); |
1da177e4 LT |
60 | queue_total++; |
61 | } | |
62 | ||
1da177e4 LT |
63 | static inline int |
64 | __ipq_set_mode(unsigned char mode, unsigned int range) | |
65 | { | |
66 | int status = 0; | |
1ab1457c | 67 | |
1da177e4 LT |
68 | switch(mode) { |
69 | case IPQ_COPY_NONE: | |
70 | case IPQ_COPY_META: | |
71 | copy_mode = mode; | |
72 | copy_range = 0; | |
73 | break; | |
1ab1457c | 74 | |
1da177e4 LT |
75 | case IPQ_COPY_PACKET: |
76 | copy_mode = mode; | |
77 | copy_range = range; | |
78 | if (copy_range > 0xFFFF) | |
79 | copy_range = 0xFFFF; | |
80 | break; | |
1ab1457c | 81 | |
1da177e4 LT |
82 | default: |
83 | status = -EINVAL; | |
84 | ||
85 | } | |
86 | return status; | |
87 | } | |
88 | ||
171b7fc4 PM |
89 | static void __ipq_flush(ipq_cmpfn cmpfn, unsigned long data); |
90 | ||
1da177e4 LT |
91 | static inline void |
92 | __ipq_reset(void) | |
93 | { | |
94 | peer_pid = 0; | |
95 | net_disable_timestamp(); | |
96 | __ipq_set_mode(IPQ_COPY_NONE, 0); | |
171b7fc4 | 97 | __ipq_flush(NULL, 0); |
1da177e4 LT |
98 | } |
99 | ||
02f014d8 | 100 | static struct nf_queue_entry * |
171b7fc4 | 101 | ipq_find_dequeue_entry(unsigned long id) |
1da177e4 | 102 | { |
02f014d8 | 103 | struct nf_queue_entry *entry = NULL, *i; |
1ab1457c | 104 | |
1da177e4 | 105 | write_lock_bh(&queue_lock); |
171b7fc4 PM |
106 | |
107 | list_for_each_entry(i, &queue_list, list) { | |
108 | if ((unsigned long)i == id) { | |
109 | entry = i; | |
110 | break; | |
111 | } | |
112 | } | |
113 | ||
114 | if (entry) { | |
115 | list_del(&entry->list); | |
116 | queue_total--; | |
117 | } | |
118 | ||
1da177e4 LT |
119 | write_unlock_bh(&queue_lock); |
120 | return entry; | |
121 | } | |
122 | ||
123 | static void | |
171b7fc4 PM |
124 | __ipq_flush(ipq_cmpfn cmpfn, unsigned long data) |
125 | { | |
02f014d8 | 126 | struct nf_queue_entry *entry, *next; |
171b7fc4 PM |
127 | |
128 | list_for_each_entry_safe(entry, next, &queue_list, list) { | |
129 | if (!cmpfn || cmpfn(entry, data)) { | |
130 | list_del(&entry->list); | |
131 | queue_total--; | |
4b3d15ef | 132 | nf_reinject(entry, NF_DROP); |
171b7fc4 PM |
133 | } |
134 | } | |
135 | } | |
136 | ||
137 | static void | |
138 | ipq_flush(ipq_cmpfn cmpfn, unsigned long data) | |
1da177e4 LT |
139 | { |
140 | write_lock_bh(&queue_lock); | |
171b7fc4 | 141 | __ipq_flush(cmpfn, data); |
1da177e4 LT |
142 | write_unlock_bh(&queue_lock); |
143 | } | |
144 | ||
145 | static struct sk_buff * | |
02f014d8 | 146 | ipq_build_packet_message(struct nf_queue_entry *entry, int *errp) |
1da177e4 | 147 | { |
27a884dc | 148 | sk_buff_data_t old_tail; |
1da177e4 LT |
149 | size_t size = 0; |
150 | size_t data_len = 0; | |
151 | struct sk_buff *skb; | |
152 | struct ipq_packet_msg *pmsg; | |
153 | struct nlmsghdr *nlh; | |
b7aa0bf7 | 154 | struct timeval tv; |
1da177e4 LT |
155 | |
156 | read_lock_bh(&queue_lock); | |
1ab1457c | 157 | |
1da177e4 LT |
158 | switch (copy_mode) { |
159 | case IPQ_COPY_META: | |
160 | case IPQ_COPY_NONE: | |
161 | size = NLMSG_SPACE(sizeof(*pmsg)); | |
1da177e4 | 162 | break; |
1ab1457c | 163 | |
1da177e4 | 164 | case IPQ_COPY_PACKET: |
84fa7933 PM |
165 | if ((entry->skb->ip_summed == CHECKSUM_PARTIAL || |
166 | entry->skb->ip_summed == CHECKSUM_COMPLETE) && | |
167 | (*errp = skb_checksum_help(entry->skb))) { | |
66a79a19 PM |
168 | read_unlock_bh(&queue_lock); |
169 | return NULL; | |
170 | } | |
1da177e4 LT |
171 | if (copy_range == 0 || copy_range > entry->skb->len) |
172 | data_len = entry->skb->len; | |
173 | else | |
174 | data_len = copy_range; | |
1ab1457c | 175 | |
1da177e4 LT |
176 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); |
177 | break; | |
1ab1457c | 178 | |
1da177e4 LT |
179 | default: |
180 | *errp = -EINVAL; | |
181 | read_unlock_bh(&queue_lock); | |
182 | return NULL; | |
183 | } | |
184 | ||
185 | read_unlock_bh(&queue_lock); | |
186 | ||
187 | skb = alloc_skb(size, GFP_ATOMIC); | |
188 | if (!skb) | |
189 | goto nlmsg_failure; | |
1ab1457c | 190 | |
27a884dc | 191 | old_tail = skb->tail; |
1da177e4 LT |
192 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); |
193 | pmsg = NLMSG_DATA(nlh); | |
194 | memset(pmsg, 0, sizeof(*pmsg)); | |
195 | ||
196 | pmsg->packet_id = (unsigned long )entry; | |
197 | pmsg->data_len = data_len; | |
b7aa0bf7 ED |
198 | tv = ktime_to_timeval(entry->skb->tstamp); |
199 | pmsg->timestamp_sec = tv.tv_sec; | |
200 | pmsg->timestamp_usec = tv.tv_usec; | |
82e91ffe | 201 | pmsg->mark = entry->skb->mark; |
02f014d8 | 202 | pmsg->hook = entry->hook; |
1da177e4 | 203 | pmsg->hw_protocol = entry->skb->protocol; |
1ab1457c | 204 | |
02f014d8 PM |
205 | if (entry->indev) |
206 | strcpy(pmsg->indev_name, entry->indev->name); | |
1da177e4 LT |
207 | else |
208 | pmsg->indev_name[0] = '\0'; | |
1ab1457c | 209 | |
02f014d8 PM |
210 | if (entry->outdev) |
211 | strcpy(pmsg->outdev_name, entry->outdev->name); | |
1da177e4 LT |
212 | else |
213 | pmsg->outdev_name[0] = '\0'; | |
1ab1457c | 214 | |
02f014d8 | 215 | if (entry->indev && entry->skb->dev) { |
1da177e4 | 216 | pmsg->hw_type = entry->skb->dev->type; |
b95cce35 | 217 | pmsg->hw_addrlen = dev_parse_header(entry->skb, pmsg->hw_addr); |
1da177e4 | 218 | } |
1ab1457c | 219 | |
1da177e4 LT |
220 | if (data_len) |
221 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) | |
222 | BUG(); | |
1ab1457c | 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 "ip6_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; |
1ab1457c | 245 | |
1da177e4 | 246 | write_lock_bh(&queue_lock); |
1ab1457c | 247 | |
1da177e4 | 248 | if (!peer_pid) |
1ab1457c | 249 | goto err_out_free_nskb; |
1da177e4 LT |
250 | |
251 | if (queue_total >= queue_maxlen) { | |
1ab1457c | 252 | queue_dropped++; |
1da177e4 LT |
253 | status = -ENOSPC; |
254 | if (net_ratelimit()) | |
1ab1457c | 255 | printk (KERN_WARNING "ip6_queue: fill at %d entries, " |
1da177e4 LT |
256 | "dropping packet(s). Dropped: %d\n", queue_total, |
257 | queue_dropped); | |
258 | goto err_out_free_nskb; | |
259 | } | |
260 | ||
1ab1457c | 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) { | |
1ab1457c | 264 | queue_user_dropped++; |
1da177e4 LT |
265 | goto err_out_unlock; |
266 | } | |
1ab1457c | 267 | |
1da177e4 LT |
268 | __ipq_enqueue_entry(entry); |
269 | ||
270 | write_unlock_bh(&queue_lock); | |
271 | return status; | |
1ab1457c | 272 | |
1da177e4 | 273 | err_out_free_nskb: |
1ab1457c 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_ipv6(ipq_verdict_msg_t *v, struct nf_queue_entry *e) |
1da177e4 LT |
283 | { |
284 | int diff; | |
285 | struct ipv6hdr *user_iph = (struct ipv6hdr *)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) { |
1da177e4 LT |
301 | printk(KERN_WARNING "ip6_queue: OOM " |
302 | "in mangle, dropping packet\n"); | |
e2b58a67 | 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 | ||
171b7fc4 | 326 | entry = ipq_find_dequeue_entry(vmsg->id); |
1da177e4 LT |
327 | if (entry == NULL) |
328 | return -ENOENT; | |
329 | else { | |
330 | int verdict = vmsg->value; | |
1ab1457c | 331 | |
1da177e4 LT |
332 | if (vmsg->data_len && vmsg->data_len == len) |
333 | if (ipq_mangle_ipv6(vmsg, entry) < 0) | |
334 | verdict = NF_DROP; | |
1ab1457c | 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, | |
1ab1457c | 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, | |
1ab1457c | 364 | pmsg->msg.mode.range); |
1da177e4 | 365 | break; |
1ab1457c | 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, | |
1ab1457c | 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; |
1ab1457c | 386 | |
02f014d8 PM |
387 | if (entry->outdev) |
388 | if (entry->outdev->ifindex == ifindex) | |
1da177e4 | 389 | return 1; |
7a6c6653 PM |
390 | #ifdef CONFIG_BRIDGE_NETFILTER |
391 | if (entry->skb->nf_bridge) { | |
392 | if (entry->skb->nf_bridge->physindev && | |
393 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
394 | return 1; | |
395 | if (entry->skb->nf_bridge->physoutdev && | |
396 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
397 | return 1; | |
398 | } | |
399 | #endif | |
1da177e4 LT |
400 | return 0; |
401 | } | |
402 | ||
403 | static void | |
404 | ipq_dev_drop(int ifindex) | |
405 | { | |
171b7fc4 | 406 | ipq_flush(dev_cmp, ifindex); |
1da177e4 LT |
407 | } |
408 | ||
409 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
410 | ||
411 | static inline void | |
cd40b7d3 | 412 | __ipq_rcv_skb(struct sk_buff *skb) |
1da177e4 LT |
413 | { |
414 | int status, type, pid, flags, nlmsglen, skblen; | |
415 | struct nlmsghdr *nlh; | |
416 | ||
417 | skblen = skb->len; | |
418 | if (skblen < sizeof(*nlh)) | |
419 | return; | |
420 | ||
b529ccf2 | 421 | nlh = nlmsg_hdr(skb); |
1da177e4 LT |
422 | nlmsglen = nlh->nlmsg_len; |
423 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) | |
424 | return; | |
425 | ||
426 | pid = nlh->nlmsg_pid; | |
427 | flags = nlh->nlmsg_flags; | |
1ab1457c | 428 | |
1da177e4 LT |
429 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) |
430 | RCV_SKB_FAIL(-EINVAL); | |
1ab1457c | 431 | |
1da177e4 LT |
432 | if (flags & MSG_TRUNC) |
433 | RCV_SKB_FAIL(-ECOMM); | |
1ab1457c | 434 | |
1da177e4 LT |
435 | type = nlh->nlmsg_type; |
436 | if (type < NLMSG_NOOP || type >= IPQM_MAX) | |
437 | RCV_SKB_FAIL(-EINVAL); | |
1ab1457c | 438 | |
1da177e4 LT |
439 | if (type <= IPQM_BASE) |
440 | return; | |
1ab1457c | 441 | |
c7bdb545 | 442 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
1ab1457c | 443 | RCV_SKB_FAIL(-EPERM); |
1da177e4 LT |
444 | |
445 | write_lock_bh(&queue_lock); | |
1ab1457c | 446 | |
1da177e4 LT |
447 | if (peer_pid) { |
448 | if (peer_pid != pid) { | |
449 | write_unlock_bh(&queue_lock); | |
450 | RCV_SKB_FAIL(-EBUSY); | |
451 | } | |
452 | } else { | |
453 | net_enable_timestamp(); | |
454 | peer_pid = pid; | |
455 | } | |
1ab1457c | 456 | |
1da177e4 | 457 | write_unlock_bh(&queue_lock); |
1ab1457c | 458 | |
1da177e4 | 459 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, |
1ab1457c | 460 | nlmsglen - NLMSG_LENGTH(0)); |
1da177e4 LT |
461 | if (status < 0) |
462 | RCV_SKB_FAIL(status); | |
1ab1457c | 463 | |
1da177e4 LT |
464 | if (flags & NLM_F_ACK) |
465 | netlink_ack(skb, nlh, 0); | |
1ab1457c | 466 | return; |
1da177e4 LT |
467 | } |
468 | ||
469 | static void | |
cd40b7d3 | 470 | ipq_rcv_skb(struct sk_buff *skb) |
1da177e4 | 471 | { |
4a3e2f71 | 472 | mutex_lock(&ipqnl_mutex); |
cd40b7d3 | 473 | __ipq_rcv_skb(skb); |
4a3e2f71 | 474 | mutex_unlock(&ipqnl_mutex); |
1da177e4 LT |
475 | } |
476 | ||
477 | static int | |
478 | ipq_rcv_dev_event(struct notifier_block *this, | |
1ab1457c | 479 | unsigned long event, void *ptr) |
1da177e4 LT |
480 | { |
481 | struct net_device *dev = ptr; | |
482 | ||
721499e8 | 483 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
484 | return NOTIFY_DONE; |
485 | ||
1da177e4 LT |
486 | /* Drop any packets associated with the downed device */ |
487 | if (event == NETDEV_DOWN) | |
488 | ipq_dev_drop(dev->ifindex); | |
489 | return NOTIFY_DONE; | |
490 | } | |
491 | ||
492 | static struct notifier_block ipq_dev_notifier = { | |
493 | .notifier_call = ipq_rcv_dev_event, | |
494 | }; | |
495 | ||
496 | static int | |
497 | ipq_rcv_nl_event(struct notifier_block *this, | |
1ab1457c | 498 | unsigned long event, void *ptr) |
1da177e4 LT |
499 | { |
500 | struct netlink_notify *n = ptr; | |
501 | ||
dee5817e | 502 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_IP6_FW) { |
1da177e4 | 503 | write_lock_bh(&queue_lock); |
09ad9bc7 | 504 | if ((net_eq(n->net, &init_net)) && (n->pid == peer_pid)) |
1da177e4 LT |
505 | __ipq_reset(); |
506 | write_unlock_bh(&queue_lock); | |
507 | } | |
508 | return NOTIFY_DONE; | |
509 | } | |
510 | ||
511 | static struct notifier_block ipq_nl_notifier = { | |
512 | .notifier_call = ipq_rcv_nl_event, | |
513 | }; | |
514 | ||
c392a740 | 515 | #ifdef CONFIG_SYSCTL |
1da177e4 LT |
516 | static struct ctl_table_header *ipq_sysctl_header; |
517 | ||
518 | static ctl_table ipq_table[] = { | |
519 | { | |
1da177e4 LT |
520 | .procname = NET_IPQ_QMAX_NAME, |
521 | .data = &queue_maxlen, | |
522 | .maxlen = sizeof(queue_maxlen), | |
523 | .mode = 0644, | |
524 | .proc_handler = proc_dointvec | |
525 | }, | |
f8572d8f | 526 | { } |
1da177e4 | 527 | }; |
c392a740 | 528 | #endif |
1da177e4 | 529 | |
c392a740 | 530 | #ifdef CONFIG_PROC_FS |
7351a22a | 531 | static int ip6_queue_show(struct seq_file *m, void *v) |
1da177e4 | 532 | { |
1da177e4 | 533 | read_lock_bh(&queue_lock); |
1ab1457c | 534 | |
7351a22a | 535 | seq_printf(m, |
1ab1457c YH |
536 | "Peer PID : %d\n" |
537 | "Copy mode : %hu\n" | |
538 | "Copy range : %u\n" | |
539 | "Queue length : %u\n" | |
540 | "Queue max. length : %u\n" | |
1da177e4 LT |
541 | "Queue dropped : %u\n" |
542 | "Netfilter dropped : %u\n", | |
1ab1457c YH |
543 | peer_pid, |
544 | copy_mode, | |
545 | copy_range, | |
546 | queue_total, | |
547 | queue_maxlen, | |
1da177e4 LT |
548 | queue_dropped, |
549 | queue_user_dropped); | |
550 | ||
551 | read_unlock_bh(&queue_lock); | |
7351a22a AD |
552 | return 0; |
553 | } | |
1ab1457c | 554 | |
7351a22a AD |
555 | static int ip6_queue_open(struct inode *inode, struct file *file) |
556 | { | |
557 | return single_open(file, ip6_queue_show, NULL); | |
1da177e4 | 558 | } |
7351a22a AD |
559 | |
560 | static const struct file_operations ip6_queue_proc_fops = { | |
561 | .open = ip6_queue_open, | |
562 | .read = seq_read, | |
563 | .llseek = seq_lseek, | |
564 | .release = single_release, | |
565 | .owner = THIS_MODULE, | |
566 | }; | |
c392a740 | 567 | #endif |
1da177e4 | 568 | |
e3ac5298 | 569 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
570 | .name = "ip6_queue", |
571 | .outfn = &ipq_enqueue_packet, | |
572 | }; | |
573 | ||
32292a7f | 574 | static int __init ip6_queue_init(void) |
1da177e4 LT |
575 | { |
576 | int status = -ENOMEM; | |
c392a740 | 577 | struct proc_dir_entry *proc __maybe_unused; |
1ab1457c | 578 | |
1da177e4 | 579 | netlink_register_notifier(&ipq_nl_notifier); |
cd40b7d3 DL |
580 | ipqnl = netlink_kernel_create(&init_net, NETLINK_IP6_FW, 0, |
581 | ipq_rcv_skb, NULL, THIS_MODULE); | |
1da177e4 LT |
582 | if (ipqnl == NULL) { |
583 | printk(KERN_ERR "ip6_queue: failed to create netlink socket\n"); | |
584 | goto cleanup_netlink_notifier; | |
585 | } | |
586 | ||
c392a740 | 587 | #ifdef CONFIG_PROC_FS |
8eeee8b1 DL |
588 | proc = proc_create(IPQ_PROC_FS_NAME, 0, init_net.proc_net, |
589 | &ip6_queue_proc_fops); | |
590 | if (!proc) { | |
1da177e4 LT |
591 | printk(KERN_ERR "ip6_queue: failed to create proc entry\n"); |
592 | goto cleanup_ipqnl; | |
593 | } | |
c392a740 | 594 | #endif |
1da177e4 | 595 | register_netdevice_notifier(&ipq_dev_notifier); |
c392a740 | 596 | #ifdef CONFIG_SYSCTL |
3d7cc2ba | 597 | ipq_sysctl_header = register_sysctl_paths(net_ipv6_ctl_path, ipq_table); |
c392a740 | 598 | #endif |
4b1e27e9 | 599 | status = nf_register_queue_handler(NFPROTO_IPV6, &nfqh); |
1da177e4 LT |
600 | if (status < 0) { |
601 | printk(KERN_ERR "ip6_queue: failed to register queue handler\n"); | |
602 | goto cleanup_sysctl; | |
603 | } | |
604 | return status; | |
605 | ||
1da177e4 | 606 | cleanup_sysctl: |
c392a740 | 607 | #ifdef CONFIG_SYSCTL |
1da177e4 | 608 | unregister_sysctl_table(ipq_sysctl_header); |
c392a740 | 609 | #endif |
1da177e4 | 610 | unregister_netdevice_notifier(&ipq_dev_notifier); |
457c4cbc | 611 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
1ab1457c | 612 | |
c392a740 | 613 | cleanup_ipqnl: __maybe_unused |
b7c6ba6e | 614 | netlink_kernel_release(ipqnl); |
4a3e2f71 AV |
615 | mutex_lock(&ipqnl_mutex); |
616 | mutex_unlock(&ipqnl_mutex); | |
1ab1457c | 617 | |
1da177e4 LT |
618 | cleanup_netlink_notifier: |
619 | netlink_unregister_notifier(&ipq_nl_notifier); | |
620 | return status; | |
621 | } | |
622 | ||
65b4b4e8 | 623 | static void __exit ip6_queue_fini(void) |
1da177e4 | 624 | { |
32292a7f | 625 | nf_unregister_queue_handlers(&nfqh); |
9481721b | 626 | |
171b7fc4 | 627 | ipq_flush(NULL, 0); |
32292a7f | 628 | |
c392a740 | 629 | #ifdef CONFIG_SYSCTL |
32292a7f | 630 | unregister_sysctl_table(ipq_sysctl_header); |
c392a740 | 631 | #endif |
32292a7f | 632 | unregister_netdevice_notifier(&ipq_dev_notifier); |
457c4cbc | 633 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
32292a7f | 634 | |
b7c6ba6e | 635 | netlink_kernel_release(ipqnl); |
32292a7f PM |
636 | mutex_lock(&ipqnl_mutex); |
637 | mutex_unlock(&ipqnl_mutex); | |
638 | ||
639 | netlink_unregister_notifier(&ipq_nl_notifier); | |
1da177e4 LT |
640 | } |
641 | ||
642 | MODULE_DESCRIPTION("IPv6 packet queue handler"); | |
643 | MODULE_LICENSE("GPL"); | |
26c3b678 | 644 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_IP6_FW); |
1da177e4 | 645 | |
65b4b4e8 AM |
646 | module_init(ip6_queue_init); |
647 | module_exit(ip6_queue_fini); |