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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> |
457c4cbc | 28 | #include <net/net_namespace.h> |
1da177e4 LT |
29 | #include <net/sock.h> |
30 | #include <net/ipv6.h> | |
31 | #include <net/ip6_route.h> | |
c01cd429 | 32 | #include <net/netfilter/nf_queue.h> |
1da177e4 LT |
33 | #include <linux/netfilter_ipv4/ip_queue.h> |
34 | #include <linux/netfilter_ipv4/ip_tables.h> | |
35 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
36 | ||
37 | #define IPQ_QMAX_DEFAULT 1024 | |
38 | #define IPQ_PROC_FS_NAME "ip6_queue" | |
39 | #define NET_IPQ_QMAX 2088 | |
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)); | |
162 | data_len = 0; | |
163 | break; | |
1ab1457c | 164 | |
1da177e4 | 165 | case IPQ_COPY_PACKET: |
84fa7933 PM |
166 | if ((entry->skb->ip_summed == CHECKSUM_PARTIAL || |
167 | entry->skb->ip_summed == CHECKSUM_COMPLETE) && | |
168 | (*errp = skb_checksum_help(entry->skb))) { | |
66a79a19 PM |
169 | read_unlock_bh(&queue_lock); |
170 | return NULL; | |
171 | } | |
1da177e4 LT |
172 | if (copy_range == 0 || copy_range > entry->skb->len) |
173 | data_len = entry->skb->len; | |
174 | else | |
175 | data_len = copy_range; | |
1ab1457c | 176 | |
1da177e4 LT |
177 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); |
178 | break; | |
1ab1457c | 179 | |
1da177e4 LT |
180 | default: |
181 | *errp = -EINVAL; | |
182 | read_unlock_bh(&queue_lock); | |
183 | return NULL; | |
184 | } | |
185 | ||
186 | read_unlock_bh(&queue_lock); | |
187 | ||
188 | skb = alloc_skb(size, GFP_ATOMIC); | |
189 | if (!skb) | |
190 | goto nlmsg_failure; | |
1ab1457c | 191 | |
27a884dc | 192 | old_tail = skb->tail; |
1da177e4 LT |
193 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); |
194 | pmsg = NLMSG_DATA(nlh); | |
195 | memset(pmsg, 0, sizeof(*pmsg)); | |
196 | ||
197 | pmsg->packet_id = (unsigned long )entry; | |
198 | pmsg->data_len = data_len; | |
b7aa0bf7 ED |
199 | tv = ktime_to_timeval(entry->skb->tstamp); |
200 | pmsg->timestamp_sec = tv.tv_sec; | |
201 | pmsg->timestamp_usec = tv.tv_usec; | |
82e91ffe | 202 | pmsg->mark = entry->skb->mark; |
02f014d8 | 203 | pmsg->hook = entry->hook; |
1da177e4 | 204 | pmsg->hw_protocol = entry->skb->protocol; |
1ab1457c | 205 | |
02f014d8 PM |
206 | if (entry->indev) |
207 | strcpy(pmsg->indev_name, entry->indev->name); | |
1da177e4 LT |
208 | else |
209 | pmsg->indev_name[0] = '\0'; | |
1ab1457c | 210 | |
02f014d8 PM |
211 | if (entry->outdev) |
212 | strcpy(pmsg->outdev_name, entry->outdev->name); | |
1da177e4 LT |
213 | else |
214 | pmsg->outdev_name[0] = '\0'; | |
1ab1457c | 215 | |
02f014d8 | 216 | if (entry->indev && entry->skb->dev) { |
1da177e4 | 217 | pmsg->hw_type = entry->skb->dev->type; |
b95cce35 | 218 | pmsg->hw_addrlen = dev_parse_header(entry->skb, pmsg->hw_addr); |
1da177e4 | 219 | } |
1ab1457c | 220 | |
1da177e4 LT |
221 | if (data_len) |
222 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) | |
223 | BUG(); | |
1ab1457c | 224 | |
1da177e4 LT |
225 | nlh->nlmsg_len = skb->tail - old_tail; |
226 | return skb; | |
227 | ||
228 | nlmsg_failure: | |
229 | if (skb) | |
230 | kfree_skb(skb); | |
231 | *errp = -EINVAL; | |
232 | printk(KERN_ERR "ip6_queue: error creating packet message\n"); | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | static int | |
02f014d8 | 237 | ipq_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
1da177e4 LT |
238 | { |
239 | int status = -EINVAL; | |
240 | struct sk_buff *nskb; | |
1da177e4 LT |
241 | |
242 | if (copy_mode == IPQ_COPY_NONE) | |
243 | return -EAGAIN; | |
244 | ||
1da177e4 LT |
245 | nskb = ipq_build_packet_message(entry, &status); |
246 | if (nskb == NULL) | |
02f014d8 | 247 | return status; |
1ab1457c | 248 | |
1da177e4 | 249 | write_lock_bh(&queue_lock); |
1ab1457c | 250 | |
1da177e4 | 251 | if (!peer_pid) |
1ab1457c | 252 | goto err_out_free_nskb; |
1da177e4 LT |
253 | |
254 | if (queue_total >= queue_maxlen) { | |
1ab1457c | 255 | queue_dropped++; |
1da177e4 LT |
256 | status = -ENOSPC; |
257 | if (net_ratelimit()) | |
1ab1457c | 258 | printk (KERN_WARNING "ip6_queue: fill at %d entries, " |
1da177e4 LT |
259 | "dropping packet(s). Dropped: %d\n", queue_total, |
260 | queue_dropped); | |
261 | goto err_out_free_nskb; | |
262 | } | |
263 | ||
1ab1457c | 264 | /* netlink_unicast will either free the nskb or attach it to a socket */ |
1da177e4 LT |
265 | status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT); |
266 | if (status < 0) { | |
1ab1457c | 267 | queue_user_dropped++; |
1da177e4 LT |
268 | goto err_out_unlock; |
269 | } | |
1ab1457c | 270 | |
1da177e4 LT |
271 | __ipq_enqueue_entry(entry); |
272 | ||
273 | write_unlock_bh(&queue_lock); | |
274 | return status; | |
1ab1457c | 275 | |
1da177e4 | 276 | err_out_free_nskb: |
1ab1457c YH |
277 | kfree_skb(nskb); |
278 | ||
1da177e4 LT |
279 | err_out_unlock: |
280 | write_unlock_bh(&queue_lock); | |
1da177e4 LT |
281 | return status; |
282 | } | |
283 | ||
284 | static int | |
02f014d8 | 285 | ipq_mangle_ipv6(ipq_verdict_msg_t *v, struct nf_queue_entry *e) |
1da177e4 LT |
286 | { |
287 | int diff; | |
288 | struct ipv6hdr *user_iph = (struct ipv6hdr *)v->payload; | |
e2b58a67 | 289 | struct sk_buff *nskb; |
1da177e4 LT |
290 | |
291 | if (v->data_len < sizeof(*user_iph)) | |
292 | return 0; | |
293 | diff = v->data_len - e->skb->len; | |
d8a585d7 PM |
294 | if (diff < 0) { |
295 | if (pskb_trim(e->skb, v->data_len)) | |
296 | return -ENOMEM; | |
297 | } else if (diff > 0) { | |
1da177e4 LT |
298 | if (v->data_len > 0xFFFF) |
299 | return -EINVAL; | |
300 | if (diff > skb_tailroom(e->skb)) { | |
e2b58a67 | 301 | nskb = skb_copy_expand(e->skb, 0, |
2ca7b0ac HX |
302 | diff - skb_tailroom(e->skb), |
303 | GFP_ATOMIC); | |
e2b58a67 | 304 | if (!nskb) { |
1da177e4 LT |
305 | printk(KERN_WARNING "ip6_queue: OOM " |
306 | "in mangle, dropping packet\n"); | |
e2b58a67 | 307 | return -ENOMEM; |
1da177e4 | 308 | } |
e2b58a67 PM |
309 | kfree_skb(e->skb); |
310 | e->skb = nskb; | |
1da177e4 LT |
311 | } |
312 | skb_put(e->skb, diff); | |
313 | } | |
37d41879 | 314 | if (!skb_make_writable(e->skb, v->data_len)) |
1da177e4 | 315 | return -ENOMEM; |
27d7ff46 | 316 | skb_copy_to_linear_data(e->skb, v->payload, v->data_len); |
66a79a19 | 317 | e->skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 318 | |
1da177e4 LT |
319 | return 0; |
320 | } | |
321 | ||
1da177e4 LT |
322 | static int |
323 | ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len) | |
324 | { | |
02f014d8 | 325 | struct nf_queue_entry *entry; |
1da177e4 LT |
326 | |
327 | if (vmsg->value > NF_MAX_VERDICT) | |
328 | return -EINVAL; | |
329 | ||
171b7fc4 | 330 | entry = ipq_find_dequeue_entry(vmsg->id); |
1da177e4 LT |
331 | if (entry == NULL) |
332 | return -ENOENT; | |
333 | else { | |
334 | int verdict = vmsg->value; | |
1ab1457c | 335 | |
1da177e4 LT |
336 | if (vmsg->data_len && vmsg->data_len == len) |
337 | if (ipq_mangle_ipv6(vmsg, entry) < 0) | |
338 | verdict = NF_DROP; | |
1ab1457c | 339 | |
4b3d15ef | 340 | nf_reinject(entry, verdict); |
1da177e4 LT |
341 | return 0; |
342 | } | |
343 | } | |
344 | ||
345 | static int | |
346 | ipq_set_mode(unsigned char mode, unsigned int range) | |
347 | { | |
348 | int status; | |
349 | ||
350 | write_lock_bh(&queue_lock); | |
351 | status = __ipq_set_mode(mode, range); | |
352 | write_unlock_bh(&queue_lock); | |
353 | return status; | |
354 | } | |
355 | ||
356 | static int | |
357 | ipq_receive_peer(struct ipq_peer_msg *pmsg, | |
1ab1457c | 358 | unsigned char type, unsigned int len) |
1da177e4 LT |
359 | { |
360 | int status = 0; | |
361 | ||
362 | if (len < sizeof(*pmsg)) | |
363 | return -EINVAL; | |
364 | ||
365 | switch (type) { | |
366 | case IPQM_MODE: | |
367 | status = ipq_set_mode(pmsg->msg.mode.value, | |
1ab1457c | 368 | pmsg->msg.mode.range); |
1da177e4 | 369 | break; |
1ab1457c | 370 | |
1da177e4 LT |
371 | case IPQM_VERDICT: |
372 | if (pmsg->msg.verdict.value > NF_MAX_VERDICT) | |
373 | status = -EINVAL; | |
374 | else | |
375 | status = ipq_set_verdict(&pmsg->msg.verdict, | |
1ab1457c | 376 | len - sizeof(*pmsg)); |
1da177e4 LT |
377 | break; |
378 | default: | |
379 | status = -EINVAL; | |
380 | } | |
381 | return status; | |
382 | } | |
383 | ||
384 | static int | |
02f014d8 | 385 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
1da177e4 | 386 | { |
02f014d8 PM |
387 | if (entry->indev) |
388 | if (entry->indev->ifindex == ifindex) | |
1da177e4 | 389 | return 1; |
1ab1457c | 390 | |
02f014d8 PM |
391 | if (entry->outdev) |
392 | if (entry->outdev->ifindex == ifindex) | |
1da177e4 | 393 | return 1; |
7a6c6653 PM |
394 | #ifdef CONFIG_BRIDGE_NETFILTER |
395 | if (entry->skb->nf_bridge) { | |
396 | if (entry->skb->nf_bridge->physindev && | |
397 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
398 | return 1; | |
399 | if (entry->skb->nf_bridge->physoutdev && | |
400 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
401 | return 1; | |
402 | } | |
403 | #endif | |
1da177e4 LT |
404 | return 0; |
405 | } | |
406 | ||
407 | static void | |
408 | ipq_dev_drop(int ifindex) | |
409 | { | |
171b7fc4 | 410 | ipq_flush(dev_cmp, ifindex); |
1da177e4 LT |
411 | } |
412 | ||
413 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
414 | ||
415 | static inline void | |
cd40b7d3 | 416 | __ipq_rcv_skb(struct sk_buff *skb) |
1da177e4 LT |
417 | { |
418 | int status, type, pid, flags, nlmsglen, skblen; | |
419 | struct nlmsghdr *nlh; | |
420 | ||
421 | skblen = skb->len; | |
422 | if (skblen < sizeof(*nlh)) | |
423 | return; | |
424 | ||
b529ccf2 | 425 | nlh = nlmsg_hdr(skb); |
1da177e4 LT |
426 | nlmsglen = nlh->nlmsg_len; |
427 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) | |
428 | return; | |
429 | ||
430 | pid = nlh->nlmsg_pid; | |
431 | flags = nlh->nlmsg_flags; | |
1ab1457c | 432 | |
1da177e4 LT |
433 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) |
434 | RCV_SKB_FAIL(-EINVAL); | |
1ab1457c | 435 | |
1da177e4 LT |
436 | if (flags & MSG_TRUNC) |
437 | RCV_SKB_FAIL(-ECOMM); | |
1ab1457c | 438 | |
1da177e4 LT |
439 | type = nlh->nlmsg_type; |
440 | if (type < NLMSG_NOOP || type >= IPQM_MAX) | |
441 | RCV_SKB_FAIL(-EINVAL); | |
1ab1457c | 442 | |
1da177e4 LT |
443 | if (type <= IPQM_BASE) |
444 | return; | |
1ab1457c | 445 | |
c7bdb545 | 446 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
1ab1457c | 447 | RCV_SKB_FAIL(-EPERM); |
1da177e4 LT |
448 | |
449 | write_lock_bh(&queue_lock); | |
1ab1457c | 450 | |
1da177e4 LT |
451 | if (peer_pid) { |
452 | if (peer_pid != pid) { | |
453 | write_unlock_bh(&queue_lock); | |
454 | RCV_SKB_FAIL(-EBUSY); | |
455 | } | |
456 | } else { | |
457 | net_enable_timestamp(); | |
458 | peer_pid = pid; | |
459 | } | |
1ab1457c | 460 | |
1da177e4 | 461 | write_unlock_bh(&queue_lock); |
1ab1457c | 462 | |
1da177e4 | 463 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, |
1ab1457c | 464 | nlmsglen - NLMSG_LENGTH(0)); |
1da177e4 LT |
465 | if (status < 0) |
466 | RCV_SKB_FAIL(status); | |
1ab1457c | 467 | |
1da177e4 LT |
468 | if (flags & NLM_F_ACK) |
469 | netlink_ack(skb, nlh, 0); | |
1ab1457c | 470 | return; |
1da177e4 LT |
471 | } |
472 | ||
473 | static void | |
cd40b7d3 | 474 | ipq_rcv_skb(struct sk_buff *skb) |
1da177e4 | 475 | { |
4a3e2f71 | 476 | mutex_lock(&ipqnl_mutex); |
cd40b7d3 | 477 | __ipq_rcv_skb(skb); |
4a3e2f71 | 478 | mutex_unlock(&ipqnl_mutex); |
1da177e4 LT |
479 | } |
480 | ||
481 | static int | |
482 | ipq_rcv_dev_event(struct notifier_block *this, | |
1ab1457c | 483 | unsigned long event, void *ptr) |
1da177e4 LT |
484 | { |
485 | struct net_device *dev = ptr; | |
486 | ||
c346dca1 | 487 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
488 | return NOTIFY_DONE; |
489 | ||
1da177e4 LT |
490 | /* Drop any packets associated with the downed device */ |
491 | if (event == NETDEV_DOWN) | |
492 | ipq_dev_drop(dev->ifindex); | |
493 | return NOTIFY_DONE; | |
494 | } | |
495 | ||
496 | static struct notifier_block ipq_dev_notifier = { | |
497 | .notifier_call = ipq_rcv_dev_event, | |
498 | }; | |
499 | ||
500 | static int | |
501 | ipq_rcv_nl_event(struct notifier_block *this, | |
1ab1457c | 502 | unsigned long event, void *ptr) |
1da177e4 LT |
503 | { |
504 | struct netlink_notify *n = ptr; | |
505 | ||
506 | if (event == NETLINK_URELEASE && | |
507 | n->protocol == NETLINK_IP6_FW && n->pid) { | |
508 | write_lock_bh(&queue_lock); | |
b4b51029 | 509 | if ((n->net == &init_net) && (n->pid == peer_pid)) |
1da177e4 LT |
510 | __ipq_reset(); |
511 | write_unlock_bh(&queue_lock); | |
512 | } | |
513 | return NOTIFY_DONE; | |
514 | } | |
515 | ||
516 | static struct notifier_block ipq_nl_notifier = { | |
517 | .notifier_call = ipq_rcv_nl_event, | |
518 | }; | |
519 | ||
c392a740 | 520 | #ifdef CONFIG_SYSCTL |
1da177e4 LT |
521 | static struct ctl_table_header *ipq_sysctl_header; |
522 | ||
523 | static ctl_table ipq_table[] = { | |
524 | { | |
525 | .ctl_name = NET_IPQ_QMAX, | |
526 | .procname = NET_IPQ_QMAX_NAME, | |
527 | .data = &queue_maxlen, | |
528 | .maxlen = sizeof(queue_maxlen), | |
529 | .mode = 0644, | |
530 | .proc_handler = proc_dointvec | |
531 | }, | |
1ab1457c | 532 | { .ctl_name = 0 } |
1da177e4 | 533 | }; |
c392a740 | 534 | #endif |
1da177e4 | 535 | |
c392a740 | 536 | #ifdef CONFIG_PROC_FS |
7351a22a | 537 | static int ip6_queue_show(struct seq_file *m, void *v) |
1da177e4 | 538 | { |
1da177e4 | 539 | read_lock_bh(&queue_lock); |
1ab1457c | 540 | |
7351a22a | 541 | seq_printf(m, |
1ab1457c YH |
542 | "Peer PID : %d\n" |
543 | "Copy mode : %hu\n" | |
544 | "Copy range : %u\n" | |
545 | "Queue length : %u\n" | |
546 | "Queue max. length : %u\n" | |
1da177e4 LT |
547 | "Queue dropped : %u\n" |
548 | "Netfilter dropped : %u\n", | |
1ab1457c YH |
549 | peer_pid, |
550 | copy_mode, | |
551 | copy_range, | |
552 | queue_total, | |
553 | queue_maxlen, | |
1da177e4 LT |
554 | queue_dropped, |
555 | queue_user_dropped); | |
556 | ||
557 | read_unlock_bh(&queue_lock); | |
7351a22a AD |
558 | return 0; |
559 | } | |
1ab1457c | 560 | |
7351a22a AD |
561 | static int ip6_queue_open(struct inode *inode, struct file *file) |
562 | { | |
563 | return single_open(file, ip6_queue_show, NULL); | |
1da177e4 | 564 | } |
7351a22a AD |
565 | |
566 | static const struct file_operations ip6_queue_proc_fops = { | |
567 | .open = ip6_queue_open, | |
568 | .read = seq_read, | |
569 | .llseek = seq_lseek, | |
570 | .release = single_release, | |
571 | .owner = THIS_MODULE, | |
572 | }; | |
c392a740 | 573 | #endif |
1da177e4 | 574 | |
e3ac5298 | 575 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
576 | .name = "ip6_queue", |
577 | .outfn = &ipq_enqueue_packet, | |
578 | }; | |
579 | ||
32292a7f | 580 | static int __init ip6_queue_init(void) |
1da177e4 LT |
581 | { |
582 | int status = -ENOMEM; | |
c392a740 | 583 | struct proc_dir_entry *proc __maybe_unused; |
1ab1457c | 584 | |
1da177e4 | 585 | netlink_register_notifier(&ipq_nl_notifier); |
cd40b7d3 DL |
586 | ipqnl = netlink_kernel_create(&init_net, NETLINK_IP6_FW, 0, |
587 | ipq_rcv_skb, NULL, THIS_MODULE); | |
1da177e4 LT |
588 | if (ipqnl == NULL) { |
589 | printk(KERN_ERR "ip6_queue: failed to create netlink socket\n"); | |
590 | goto cleanup_netlink_notifier; | |
591 | } | |
592 | ||
c392a740 | 593 | #ifdef CONFIG_PROC_FS |
7351a22a AD |
594 | proc = create_proc_entry(IPQ_PROC_FS_NAME, 0, init_net.proc_net); |
595 | if (proc) { | |
1da177e4 | 596 | proc->owner = THIS_MODULE; |
7351a22a AD |
597 | proc->proc_fops = &ip6_queue_proc_fops; |
598 | } else { | |
1da177e4 LT |
599 | printk(KERN_ERR "ip6_queue: failed to create proc entry\n"); |
600 | goto cleanup_ipqnl; | |
601 | } | |
c392a740 | 602 | #endif |
1da177e4 | 603 | register_netdevice_notifier(&ipq_dev_notifier); |
c392a740 | 604 | #ifdef CONFIG_SYSCTL |
3d7cc2ba | 605 | ipq_sysctl_header = register_sysctl_paths(net_ipv6_ctl_path, ipq_table); |
c392a740 | 606 | #endif |
bbd86b9f | 607 | status = nf_register_queue_handler(PF_INET6, &nfqh); |
1da177e4 LT |
608 | if (status < 0) { |
609 | printk(KERN_ERR "ip6_queue: failed to register queue handler\n"); | |
610 | goto cleanup_sysctl; | |
611 | } | |
612 | return status; | |
613 | ||
1da177e4 | 614 | cleanup_sysctl: |
c392a740 | 615 | #ifdef CONFIG_SYSCTL |
1da177e4 | 616 | unregister_sysctl_table(ipq_sysctl_header); |
c392a740 | 617 | #endif |
1da177e4 | 618 | unregister_netdevice_notifier(&ipq_dev_notifier); |
457c4cbc | 619 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
1ab1457c | 620 | |
c392a740 | 621 | cleanup_ipqnl: __maybe_unused |
b7c6ba6e | 622 | netlink_kernel_release(ipqnl); |
4a3e2f71 AV |
623 | mutex_lock(&ipqnl_mutex); |
624 | mutex_unlock(&ipqnl_mutex); | |
1ab1457c | 625 | |
1da177e4 LT |
626 | cleanup_netlink_notifier: |
627 | netlink_unregister_notifier(&ipq_nl_notifier); | |
628 | return status; | |
629 | } | |
630 | ||
65b4b4e8 | 631 | static void __exit ip6_queue_fini(void) |
1da177e4 | 632 | { |
32292a7f PM |
633 | nf_unregister_queue_handlers(&nfqh); |
634 | synchronize_net(); | |
171b7fc4 | 635 | ipq_flush(NULL, 0); |
32292a7f | 636 | |
c392a740 | 637 | #ifdef CONFIG_SYSCTL |
32292a7f | 638 | unregister_sysctl_table(ipq_sysctl_header); |
c392a740 | 639 | #endif |
32292a7f | 640 | unregister_netdevice_notifier(&ipq_dev_notifier); |
457c4cbc | 641 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
32292a7f | 642 | |
b7c6ba6e | 643 | netlink_kernel_release(ipqnl); |
32292a7f PM |
644 | mutex_lock(&ipqnl_mutex); |
645 | mutex_unlock(&ipqnl_mutex); | |
646 | ||
647 | netlink_unregister_notifier(&ipq_nl_notifier); | |
1da177e4 LT |
648 | } |
649 | ||
650 | MODULE_DESCRIPTION("IPv6 packet queue handler"); | |
651 | MODULE_LICENSE("GPL"); | |
652 | ||
65b4b4e8 AM |
653 | module_init(ip6_queue_init); |
654 | module_exit(ip6_queue_fini); |