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Commit | Line | Data |
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c1d10adb PNA |
1 | /* Connection tracking via netlink socket. Allows for user space |
2 | * protocol helpers and general trouble making from userspace. | |
3 | * | |
4 | * (C) 2001 by Jay Schulist <jschlst@samba.org> | |
dc808fe2 | 5 | * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org> |
c1d10adb | 6 | * (C) 2003 by Patrick Mchardy <kaber@trash.net> |
1cde6436 | 7 | * (C) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net> |
c1d10adb PNA |
8 | * |
9 | * I've reworked this stuff to use attributes instead of conntrack | |
10 | * structures. 5.44 am. I need more tea. --pablo 05/07/11. | |
11 | * | |
12 | * Initial connection tracking via netlink development funded and | |
13 | * generally made possible by Network Robots, Inc. (www.networkrobots.com) | |
14 | * | |
15 | * Further development of this code funded by Astaro AG (http://www.astaro.com) | |
16 | * | |
17 | * This software may be used and distributed according to the terms | |
18 | * of the GNU General Public License, incorporated herein by reference. | |
19 | * | |
20 | * Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14) | |
21 | */ | |
22 | ||
23 | #include <linux/init.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/timer.h> | |
28 | #include <linux/skbuff.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/netlink.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/notifier.h> | |
33 | ||
34 | #include <linux/netfilter.h> | |
35 | #include <net/netfilter/nf_conntrack.h> | |
36 | #include <net/netfilter/nf_conntrack_core.h> | |
37 | #include <net/netfilter/nf_conntrack_helper.h> | |
38 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
39 | #include <net/netfilter/nf_conntrack_protocol.h> | |
40 | #include <linux/netfilter_ipv4/ip_nat_protocol.h> | |
41 | ||
42 | #include <linux/netfilter/nfnetlink.h> | |
43 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
44 | ||
45 | MODULE_LICENSE("GPL"); | |
46 | ||
dc808fe2 | 47 | static char __initdata version[] = "0.93"; |
c1d10adb PNA |
48 | |
49 | #if 0 | |
50 | #define DEBUGP printk | |
51 | #else | |
52 | #define DEBUGP(format, args...) | |
53 | #endif | |
54 | ||
55 | ||
56 | static inline int | |
57 | ctnetlink_dump_tuples_proto(struct sk_buff *skb, | |
1cde6436 PNA |
58 | const struct nf_conntrack_tuple *tuple, |
59 | struct nf_conntrack_protocol *proto) | |
c1d10adb | 60 | { |
c1d10adb | 61 | int ret = 0; |
1cde6436 | 62 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO); |
c1d10adb PNA |
63 | |
64 | NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum); | |
65 | ||
c1d10adb PNA |
66 | if (likely(proto->tuple_to_nfattr)) |
67 | ret = proto->tuple_to_nfattr(skb, tuple); | |
68 | ||
1cde6436 | 69 | NFA_NEST_END(skb, nest_parms); |
c1d10adb PNA |
70 | |
71 | return ret; | |
72 | ||
73 | nfattr_failure: | |
74 | return -1; | |
75 | } | |
76 | ||
77 | static inline int | |
1cde6436 PNA |
78 | ctnetlink_dump_tuples_ip(struct sk_buff *skb, |
79 | const struct nf_conntrack_tuple *tuple, | |
80 | struct nf_conntrack_l3proto *l3proto) | |
c1d10adb | 81 | { |
c1d10adb | 82 | int ret = 0; |
1cde6436 PNA |
83 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP); |
84 | ||
c1d10adb PNA |
85 | if (likely(l3proto->tuple_to_nfattr)) |
86 | ret = l3proto->tuple_to_nfattr(skb, tuple); | |
1cde6436 | 87 | |
c1d10adb PNA |
88 | NFA_NEST_END(skb, nest_parms); |
89 | ||
1cde6436 PNA |
90 | return ret; |
91 | ||
92 | nfattr_failure: | |
93 | return -1; | |
94 | } | |
95 | ||
96 | static inline int | |
97 | ctnetlink_dump_tuples(struct sk_buff *skb, | |
98 | const struct nf_conntrack_tuple *tuple) | |
99 | { | |
100 | int ret; | |
101 | struct nf_conntrack_l3proto *l3proto; | |
102 | struct nf_conntrack_protocol *proto; | |
103 | ||
104 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); | |
105 | ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto); | |
c1d10adb PNA |
106 | nf_ct_l3proto_put(l3proto); |
107 | ||
108 | if (unlikely(ret < 0)) | |
109 | return ret; | |
110 | ||
1cde6436 PNA |
111 | proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
112 | ret = ctnetlink_dump_tuples_proto(skb, tuple, proto); | |
113 | nf_ct_proto_put(proto); | |
c1d10adb PNA |
114 | |
115 | return ret; | |
c1d10adb PNA |
116 | } |
117 | ||
118 | static inline int | |
119 | ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct) | |
120 | { | |
121 | u_int32_t status = htonl((u_int32_t) ct->status); | |
122 | NFA_PUT(skb, CTA_STATUS, sizeof(status), &status); | |
123 | return 0; | |
124 | ||
125 | nfattr_failure: | |
126 | return -1; | |
127 | } | |
128 | ||
129 | static inline int | |
130 | ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct) | |
131 | { | |
132 | long timeout_l = ct->timeout.expires - jiffies; | |
133 | u_int32_t timeout; | |
134 | ||
135 | if (timeout_l < 0) | |
136 | timeout = 0; | |
137 | else | |
138 | timeout = htonl(timeout_l / HZ); | |
139 | ||
140 | NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout); | |
141 | return 0; | |
142 | ||
143 | nfattr_failure: | |
144 | return -1; | |
145 | } | |
146 | ||
147 | static inline int | |
148 | ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct) | |
149 | { | |
150 | struct nf_conntrack_protocol *proto = nf_ct_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum); | |
151 | struct nfattr *nest_proto; | |
152 | int ret; | |
153 | ||
154 | if (!proto->to_nfattr) { | |
155 | nf_ct_proto_put(proto); | |
156 | return 0; | |
157 | } | |
158 | ||
159 | nest_proto = NFA_NEST(skb, CTA_PROTOINFO); | |
160 | ||
161 | ret = proto->to_nfattr(skb, nest_proto, ct); | |
162 | ||
163 | nf_ct_proto_put(proto); | |
164 | ||
165 | NFA_NEST_END(skb, nest_proto); | |
166 | ||
167 | return ret; | |
168 | ||
169 | nfattr_failure: | |
170 | return -1; | |
171 | } | |
172 | ||
173 | static inline int | |
174 | ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct) | |
175 | { | |
176 | struct nfattr *nest_helper; | |
dc808fe2 | 177 | const struct nf_conn_help *help = nfct_help(ct); |
c1d10adb | 178 | |
dc808fe2 | 179 | if (!help || !help->helper) |
c1d10adb PNA |
180 | return 0; |
181 | ||
182 | nest_helper = NFA_NEST(skb, CTA_HELP); | |
dc808fe2 | 183 | NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name); |
c1d10adb | 184 | |
dc808fe2 HW |
185 | if (help->helper->to_nfattr) |
186 | help->helper->to_nfattr(skb, ct); | |
c1d10adb PNA |
187 | |
188 | NFA_NEST_END(skb, nest_helper); | |
189 | ||
190 | return 0; | |
191 | ||
192 | nfattr_failure: | |
193 | return -1; | |
194 | } | |
195 | ||
196 | #ifdef CONFIG_NF_CT_ACCT | |
197 | static inline int | |
198 | ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct, | |
199 | enum ip_conntrack_dir dir) | |
200 | { | |
201 | enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG; | |
202 | struct nfattr *nest_count = NFA_NEST(skb, type); | |
203 | u_int32_t tmp; | |
204 | ||
205 | tmp = htonl(ct->counters[dir].packets); | |
206 | NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp); | |
207 | ||
208 | tmp = htonl(ct->counters[dir].bytes); | |
209 | NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp); | |
210 | ||
211 | NFA_NEST_END(skb, nest_count); | |
212 | ||
213 | return 0; | |
214 | ||
215 | nfattr_failure: | |
216 | return -1; | |
217 | } | |
218 | #else | |
219 | #define ctnetlink_dump_counters(a, b, c) (0) | |
220 | #endif | |
221 | ||
222 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
223 | static inline int | |
224 | ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct) | |
225 | { | |
226 | u_int32_t mark = htonl(ct->mark); | |
227 | ||
228 | NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark); | |
229 | return 0; | |
230 | ||
231 | nfattr_failure: | |
232 | return -1; | |
233 | } | |
234 | #else | |
235 | #define ctnetlink_dump_mark(a, b) (0) | |
236 | #endif | |
237 | ||
238 | static inline int | |
239 | ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct) | |
240 | { | |
241 | u_int32_t id = htonl(ct->id); | |
242 | NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id); | |
243 | return 0; | |
244 | ||
245 | nfattr_failure: | |
246 | return -1; | |
247 | } | |
248 | ||
249 | static inline int | |
250 | ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct) | |
251 | { | |
252 | u_int32_t use = htonl(atomic_read(&ct->ct_general.use)); | |
253 | ||
254 | NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use); | |
255 | return 0; | |
256 | ||
257 | nfattr_failure: | |
258 | return -1; | |
259 | } | |
260 | ||
261 | #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple) | |
262 | ||
263 | static int | |
264 | ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, | |
265 | int event, int nowait, | |
266 | const struct nf_conn *ct) | |
267 | { | |
268 | struct nlmsghdr *nlh; | |
269 | struct nfgenmsg *nfmsg; | |
270 | struct nfattr *nest_parms; | |
271 | unsigned char *b; | |
272 | ||
273 | b = skb->tail; | |
274 | ||
275 | event |= NFNL_SUBSYS_CTNETLINK << 8; | |
276 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); | |
277 | nfmsg = NLMSG_DATA(nlh); | |
278 | ||
279 | nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; | |
280 | nfmsg->nfgen_family = | |
281 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
282 | nfmsg->version = NFNETLINK_V0; | |
283 | nfmsg->res_id = 0; | |
284 | ||
285 | nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG); | |
286 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) | |
287 | goto nfattr_failure; | |
288 | NFA_NEST_END(skb, nest_parms); | |
289 | ||
290 | nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY); | |
291 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) | |
292 | goto nfattr_failure; | |
293 | NFA_NEST_END(skb, nest_parms); | |
294 | ||
295 | if (ctnetlink_dump_status(skb, ct) < 0 || | |
296 | ctnetlink_dump_timeout(skb, ct) < 0 || | |
297 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || | |
298 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 || | |
299 | ctnetlink_dump_protoinfo(skb, ct) < 0 || | |
300 | ctnetlink_dump_helpinfo(skb, ct) < 0 || | |
301 | ctnetlink_dump_mark(skb, ct) < 0 || | |
302 | ctnetlink_dump_id(skb, ct) < 0 || | |
303 | ctnetlink_dump_use(skb, ct) < 0) | |
304 | goto nfattr_failure; | |
305 | ||
306 | nlh->nlmsg_len = skb->tail - b; | |
307 | return skb->len; | |
308 | ||
309 | nlmsg_failure: | |
310 | nfattr_failure: | |
311 | skb_trim(skb, b - skb->data); | |
312 | return -1; | |
313 | } | |
314 | ||
315 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
316 | static int ctnetlink_conntrack_event(struct notifier_block *this, | |
317 | unsigned long events, void *ptr) | |
318 | { | |
319 | struct nlmsghdr *nlh; | |
320 | struct nfgenmsg *nfmsg; | |
321 | struct nfattr *nest_parms; | |
322 | struct nf_conn *ct = (struct nf_conn *)ptr; | |
323 | struct sk_buff *skb; | |
324 | unsigned int type; | |
325 | unsigned char *b; | |
326 | unsigned int flags = 0, group; | |
327 | ||
328 | /* ignore our fake conntrack entry */ | |
329 | if (ct == &nf_conntrack_untracked) | |
330 | return NOTIFY_DONE; | |
331 | ||
332 | if (events & IPCT_DESTROY) { | |
333 | type = IPCTNL_MSG_CT_DELETE; | |
334 | group = NFNLGRP_CONNTRACK_DESTROY; | |
335 | } else if (events & (IPCT_NEW | IPCT_RELATED)) { | |
336 | type = IPCTNL_MSG_CT_NEW; | |
337 | flags = NLM_F_CREATE|NLM_F_EXCL; | |
338 | /* dump everything */ | |
339 | events = ~0UL; | |
340 | group = NFNLGRP_CONNTRACK_NEW; | |
341 | } else if (events & (IPCT_STATUS | | |
342 | IPCT_PROTOINFO | | |
343 | IPCT_HELPER | | |
344 | IPCT_HELPINFO | | |
345 | IPCT_NATINFO)) { | |
346 | type = IPCTNL_MSG_CT_NEW; | |
347 | group = NFNLGRP_CONNTRACK_UPDATE; | |
348 | } else | |
349 | return NOTIFY_DONE; | |
a2427692 PM |
350 | |
351 | if (!nfnetlink_has_listeners(group)) | |
352 | return NOTIFY_DONE; | |
353 | ||
c1d10adb PNA |
354 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
355 | if (!skb) | |
356 | return NOTIFY_DONE; | |
357 | ||
358 | b = skb->tail; | |
359 | ||
360 | type |= NFNL_SUBSYS_CTNETLINK << 8; | |
361 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); | |
362 | nfmsg = NLMSG_DATA(nlh); | |
363 | ||
364 | nlh->nlmsg_flags = flags; | |
365 | nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
366 | nfmsg->version = NFNETLINK_V0; | |
367 | nfmsg->res_id = 0; | |
368 | ||
369 | nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG); | |
370 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) | |
371 | goto nfattr_failure; | |
372 | NFA_NEST_END(skb, nest_parms); | |
373 | ||
374 | nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY); | |
375 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) | |
376 | goto nfattr_failure; | |
377 | NFA_NEST_END(skb, nest_parms); | |
378 | ||
379 | /* NAT stuff is now a status flag */ | |
380 | if ((events & IPCT_STATUS || events & IPCT_NATINFO) | |
381 | && ctnetlink_dump_status(skb, ct) < 0) | |
382 | goto nfattr_failure; | |
383 | if (events & IPCT_REFRESH | |
384 | && ctnetlink_dump_timeout(skb, ct) < 0) | |
385 | goto nfattr_failure; | |
386 | if (events & IPCT_PROTOINFO | |
387 | && ctnetlink_dump_protoinfo(skb, ct) < 0) | |
388 | goto nfattr_failure; | |
389 | if (events & IPCT_HELPINFO | |
390 | && ctnetlink_dump_helpinfo(skb, ct) < 0) | |
391 | goto nfattr_failure; | |
392 | ||
393 | if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || | |
394 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0) | |
395 | goto nfattr_failure; | |
396 | ||
397 | nlh->nlmsg_len = skb->tail - b; | |
398 | nfnetlink_send(skb, 0, group, 0); | |
399 | return NOTIFY_DONE; | |
400 | ||
401 | nlmsg_failure: | |
402 | nfattr_failure: | |
403 | kfree_skb(skb); | |
404 | return NOTIFY_DONE; | |
405 | } | |
406 | #endif /* CONFIG_NF_CONNTRACK_EVENTS */ | |
407 | ||
408 | static int ctnetlink_done(struct netlink_callback *cb) | |
409 | { | |
89f2e218 PM |
410 | if (cb->args[1]) |
411 | nf_ct_put((struct nf_conn *)cb->args[1]); | |
c1d10adb PNA |
412 | DEBUGP("entered %s\n", __FUNCTION__); |
413 | return 0; | |
414 | } | |
415 | ||
87711cb8 PNA |
416 | #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num |
417 | ||
c1d10adb PNA |
418 | static int |
419 | ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb) | |
420 | { | |
89f2e218 | 421 | struct nf_conn *ct, *last; |
c1d10adb PNA |
422 | struct nf_conntrack_tuple_hash *h; |
423 | struct list_head *i; | |
87711cb8 PNA |
424 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
425 | u_int8_t l3proto = nfmsg->nfgen_family; | |
c1d10adb PNA |
426 | |
427 | DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__, | |
428 | cb->args[0], *id); | |
429 | ||
430 | read_lock_bh(&nf_conntrack_lock); | |
89f2e218 PM |
431 | for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) { |
432 | restart: | |
433 | last = (struct nf_conn *)cb->args[1]; | |
c1d10adb PNA |
434 | list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) { |
435 | h = (struct nf_conntrack_tuple_hash *) i; | |
436 | if (DIRECTION(h) != IP_CT_DIR_ORIGINAL) | |
437 | continue; | |
438 | ct = nf_ct_tuplehash_to_ctrack(h); | |
87711cb8 PNA |
439 | /* Dump entries of a given L3 protocol number. |
440 | * If it is not specified, ie. l3proto == 0, | |
441 | * then dump everything. */ | |
442 | if (l3proto && L3PROTO(ct) != l3proto) | |
443 | continue; | |
89f2e218 PM |
444 | if (last != NULL) { |
445 | if (ct == last) { | |
446 | nf_ct_put(last); | |
447 | cb->args[1] = 0; | |
448 | last = NULL; | |
449 | } else | |
450 | continue; | |
451 | } | |
c1d10adb PNA |
452 | if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid, |
453 | cb->nlh->nlmsg_seq, | |
454 | IPCTNL_MSG_CT_NEW, | |
89f2e218 PM |
455 | 1, ct) < 0) { |
456 | nf_conntrack_get(&ct->ct_general); | |
457 | cb->args[1] = (unsigned long)ct; | |
c1d10adb | 458 | goto out; |
89f2e218 PM |
459 | } |
460 | } | |
461 | if (last != NULL) { | |
462 | nf_ct_put(last); | |
463 | cb->args[1] = 0; | |
464 | goto restart; | |
c1d10adb PNA |
465 | } |
466 | } | |
89f2e218 | 467 | out: |
c1d10adb PNA |
468 | read_unlock_bh(&nf_conntrack_lock); |
469 | ||
470 | DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id); | |
471 | ||
472 | return skb->len; | |
473 | } | |
474 | ||
475 | #ifdef CONFIG_NF_CT_ACCT | |
476 | static int | |
477 | ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb) | |
478 | { | |
479 | struct nf_conn *ct = NULL; | |
480 | struct nf_conntrack_tuple_hash *h; | |
481 | struct list_head *i; | |
482 | u_int32_t *id = (u_int32_t *) &cb->args[1]; | |
87711cb8 PNA |
483 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
484 | u_int8_t l3proto = nfmsg->nfgen_family; | |
c1d10adb PNA |
485 | |
486 | DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__, | |
487 | cb->args[0], *id); | |
488 | ||
489 | write_lock_bh(&nf_conntrack_lock); | |
490 | for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) { | |
491 | list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) { | |
492 | h = (struct nf_conntrack_tuple_hash *) i; | |
493 | if (DIRECTION(h) != IP_CT_DIR_ORIGINAL) | |
494 | continue; | |
495 | ct = nf_ct_tuplehash_to_ctrack(h); | |
87711cb8 PNA |
496 | if (l3proto && L3PROTO(ct) != l3proto) |
497 | continue; | |
c1d10adb PNA |
498 | if (ct->id <= *id) |
499 | continue; | |
500 | if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
501 | cb->nlh->nlmsg_seq, | |
502 | IPCTNL_MSG_CT_NEW, | |
503 | 1, ct) < 0) | |
504 | goto out; | |
505 | *id = ct->id; | |
506 | ||
507 | memset(&ct->counters, 0, sizeof(ct->counters)); | |
508 | } | |
509 | } | |
510 | out: | |
511 | write_unlock_bh(&nf_conntrack_lock); | |
512 | ||
513 | DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id); | |
514 | ||
515 | return skb->len; | |
516 | } | |
517 | #endif | |
518 | ||
519 | static inline int | |
520 | ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple) | |
521 | { | |
522 | struct nfattr *tb[CTA_IP_MAX]; | |
523 | struct nf_conntrack_l3proto *l3proto; | |
524 | int ret = 0; | |
525 | ||
526 | DEBUGP("entered %s\n", __FUNCTION__); | |
527 | ||
528 | nfattr_parse_nested(tb, CTA_IP_MAX, attr); | |
529 | ||
530 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); | |
531 | ||
532 | if (likely(l3proto->nfattr_to_tuple)) | |
533 | ret = l3proto->nfattr_to_tuple(tb, tuple); | |
534 | ||
535 | nf_ct_l3proto_put(l3proto); | |
536 | ||
537 | DEBUGP("leaving\n"); | |
538 | ||
539 | return ret; | |
540 | } | |
541 | ||
542 | static const size_t cta_min_proto[CTA_PROTO_MAX] = { | |
543 | [CTA_PROTO_NUM-1] = sizeof(u_int8_t), | |
544 | }; | |
545 | ||
546 | static inline int | |
547 | ctnetlink_parse_tuple_proto(struct nfattr *attr, | |
548 | struct nf_conntrack_tuple *tuple) | |
549 | { | |
550 | struct nfattr *tb[CTA_PROTO_MAX]; | |
551 | struct nf_conntrack_protocol *proto; | |
552 | int ret = 0; | |
553 | ||
554 | DEBUGP("entered %s\n", __FUNCTION__); | |
555 | ||
556 | nfattr_parse_nested(tb, CTA_PROTO_MAX, attr); | |
557 | ||
558 | if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto)) | |
559 | return -EINVAL; | |
560 | ||
561 | if (!tb[CTA_PROTO_NUM-1]) | |
562 | return -EINVAL; | |
563 | tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]); | |
564 | ||
565 | proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum); | |
566 | ||
567 | if (likely(proto->nfattr_to_tuple)) | |
568 | ret = proto->nfattr_to_tuple(tb, tuple); | |
569 | ||
570 | nf_ct_proto_put(proto); | |
571 | ||
572 | return ret; | |
573 | } | |
574 | ||
575 | static inline int | |
576 | ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple, | |
577 | enum ctattr_tuple type, u_int8_t l3num) | |
578 | { | |
579 | struct nfattr *tb[CTA_TUPLE_MAX]; | |
580 | int err; | |
581 | ||
582 | DEBUGP("entered %s\n", __FUNCTION__); | |
583 | ||
584 | memset(tuple, 0, sizeof(*tuple)); | |
585 | ||
586 | nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]); | |
587 | ||
588 | if (!tb[CTA_TUPLE_IP-1]) | |
589 | return -EINVAL; | |
590 | ||
591 | tuple->src.l3num = l3num; | |
592 | ||
593 | err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple); | |
594 | if (err < 0) | |
595 | return err; | |
596 | ||
597 | if (!tb[CTA_TUPLE_PROTO-1]) | |
598 | return -EINVAL; | |
599 | ||
600 | err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple); | |
601 | if (err < 0) | |
602 | return err; | |
603 | ||
604 | /* orig and expect tuples get DIR_ORIGINAL */ | |
605 | if (type == CTA_TUPLE_REPLY) | |
606 | tuple->dst.dir = IP_CT_DIR_REPLY; | |
607 | else | |
608 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
609 | ||
610 | NF_CT_DUMP_TUPLE(tuple); | |
611 | ||
612 | DEBUGP("leaving\n"); | |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | #ifdef CONFIG_IP_NF_NAT_NEEDED | |
618 | static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = { | |
619 | [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t), | |
620 | [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t), | |
621 | }; | |
622 | ||
623 | static int ctnetlink_parse_nat_proto(struct nfattr *attr, | |
624 | const struct nf_conn *ct, | |
625 | struct ip_nat_range *range) | |
626 | { | |
627 | struct nfattr *tb[CTA_PROTONAT_MAX]; | |
628 | struct ip_nat_protocol *npt; | |
629 | ||
630 | DEBUGP("entered %s\n", __FUNCTION__); | |
631 | ||
632 | nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr); | |
633 | ||
634 | if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat)) | |
635 | return -EINVAL; | |
636 | ||
637 | npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum); | |
638 | ||
639 | if (!npt->nfattr_to_range) { | |
640 | ip_nat_proto_put(npt); | |
641 | return 0; | |
642 | } | |
643 | ||
644 | /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */ | |
645 | if (npt->nfattr_to_range(tb, range) > 0) | |
646 | range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED; | |
647 | ||
648 | ip_nat_proto_put(npt); | |
649 | ||
650 | DEBUGP("leaving\n"); | |
651 | return 0; | |
652 | } | |
653 | ||
654 | static const size_t cta_min_nat[CTA_NAT_MAX] = { | |
655 | [CTA_NAT_MINIP-1] = sizeof(u_int32_t), | |
656 | [CTA_NAT_MAXIP-1] = sizeof(u_int32_t), | |
657 | }; | |
658 | ||
659 | static inline int | |
3726add7 | 660 | ctnetlink_parse_nat(struct nfattr *nat, |
c1d10adb PNA |
661 | const struct nf_conn *ct, struct ip_nat_range *range) |
662 | { | |
663 | struct nfattr *tb[CTA_NAT_MAX]; | |
664 | int err; | |
665 | ||
666 | DEBUGP("entered %s\n", __FUNCTION__); | |
667 | ||
668 | memset(range, 0, sizeof(*range)); | |
669 | ||
3726add7 | 670 | nfattr_parse_nested(tb, CTA_NAT_MAX, nat); |
c1d10adb PNA |
671 | |
672 | if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat)) | |
673 | return -EINVAL; | |
674 | ||
675 | if (tb[CTA_NAT_MINIP-1]) | |
676 | range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]); | |
677 | ||
678 | if (!tb[CTA_NAT_MAXIP-1]) | |
679 | range->max_ip = range->min_ip; | |
680 | else | |
681 | range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]); | |
682 | ||
683 | if (range->min_ip) | |
684 | range->flags |= IP_NAT_RANGE_MAP_IPS; | |
685 | ||
686 | if (!tb[CTA_NAT_PROTO-1]) | |
687 | return 0; | |
688 | ||
689 | err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range); | |
690 | if (err < 0) | |
691 | return err; | |
692 | ||
693 | DEBUGP("leaving\n"); | |
694 | return 0; | |
695 | } | |
696 | #endif | |
697 | ||
698 | static inline int | |
699 | ctnetlink_parse_help(struct nfattr *attr, char **helper_name) | |
700 | { | |
701 | struct nfattr *tb[CTA_HELP_MAX]; | |
702 | ||
703 | DEBUGP("entered %s\n", __FUNCTION__); | |
704 | ||
705 | nfattr_parse_nested(tb, CTA_HELP_MAX, attr); | |
706 | ||
707 | if (!tb[CTA_HELP_NAME-1]) | |
708 | return -EINVAL; | |
709 | ||
710 | *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]); | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
715 | static const size_t cta_min[CTA_MAX] = { | |
716 | [CTA_STATUS-1] = sizeof(u_int32_t), | |
717 | [CTA_TIMEOUT-1] = sizeof(u_int32_t), | |
718 | [CTA_MARK-1] = sizeof(u_int32_t), | |
719 | [CTA_USE-1] = sizeof(u_int32_t), | |
720 | [CTA_ID-1] = sizeof(u_int32_t) | |
721 | }; | |
722 | ||
723 | static int | |
724 | ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, | |
725 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
726 | { | |
727 | struct nf_conntrack_tuple_hash *h; | |
728 | struct nf_conntrack_tuple tuple; | |
729 | struct nf_conn *ct; | |
730 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
731 | u_int8_t u3 = nfmsg->nfgen_family; | |
732 | int err = 0; | |
733 | ||
734 | DEBUGP("entered %s\n", __FUNCTION__); | |
735 | ||
736 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) | |
737 | return -EINVAL; | |
738 | ||
739 | if (cda[CTA_TUPLE_ORIG-1]) | |
740 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); | |
741 | else if (cda[CTA_TUPLE_REPLY-1]) | |
742 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); | |
743 | else { | |
744 | /* Flush the whole table */ | |
745 | nf_conntrack_flush(); | |
746 | return 0; | |
747 | } | |
748 | ||
749 | if (err < 0) | |
750 | return err; | |
751 | ||
752 | h = nf_conntrack_find_get(&tuple, NULL); | |
753 | if (!h) { | |
754 | DEBUGP("tuple not found in conntrack hash\n"); | |
755 | return -ENOENT; | |
756 | } | |
757 | ||
758 | ct = nf_ct_tuplehash_to_ctrack(h); | |
759 | ||
760 | if (cda[CTA_ID-1]) { | |
761 | u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1])); | |
762 | if (ct->id != id) { | |
763 | nf_ct_put(ct); | |
764 | return -ENOENT; | |
765 | } | |
766 | } | |
767 | if (del_timer(&ct->timeout)) | |
768 | ct->timeout.function((unsigned long)ct); | |
769 | ||
770 | nf_ct_put(ct); | |
771 | DEBUGP("leaving\n"); | |
772 | ||
773 | return 0; | |
774 | } | |
775 | ||
776 | static int | |
777 | ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, | |
778 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
779 | { | |
780 | struct nf_conntrack_tuple_hash *h; | |
781 | struct nf_conntrack_tuple tuple; | |
782 | struct nf_conn *ct; | |
783 | struct sk_buff *skb2 = NULL; | |
784 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
785 | u_int8_t u3 = nfmsg->nfgen_family; | |
786 | int err = 0; | |
787 | ||
788 | DEBUGP("entered %s\n", __FUNCTION__); | |
789 | ||
790 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
791 | u32 rlen; | |
792 | ||
c1d10adb PNA |
793 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == |
794 | IPCTNL_MSG_CT_GET_CTRZERO) { | |
795 | #ifdef CONFIG_NF_CT_ACCT | |
796 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, | |
797 | ctnetlink_dump_table_w, | |
798 | ctnetlink_done)) != 0) | |
799 | return -EINVAL; | |
800 | #else | |
801 | return -ENOTSUPP; | |
802 | #endif | |
803 | } else { | |
804 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, | |
805 | ctnetlink_dump_table, | |
806 | ctnetlink_done)) != 0) | |
807 | return -EINVAL; | |
808 | } | |
809 | ||
810 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
811 | if (rlen > skb->len) | |
812 | rlen = skb->len; | |
813 | skb_pull(skb, rlen); | |
814 | return 0; | |
815 | } | |
816 | ||
817 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) | |
818 | return -EINVAL; | |
819 | ||
820 | if (cda[CTA_TUPLE_ORIG-1]) | |
821 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); | |
822 | else if (cda[CTA_TUPLE_REPLY-1]) | |
823 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); | |
824 | else | |
825 | return -EINVAL; | |
826 | ||
827 | if (err < 0) | |
828 | return err; | |
829 | ||
830 | h = nf_conntrack_find_get(&tuple, NULL); | |
831 | if (!h) { | |
832 | DEBUGP("tuple not found in conntrack hash"); | |
833 | return -ENOENT; | |
834 | } | |
835 | DEBUGP("tuple found\n"); | |
836 | ct = nf_ct_tuplehash_to_ctrack(h); | |
837 | ||
838 | err = -ENOMEM; | |
839 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
840 | if (!skb2) { | |
841 | nf_ct_put(ct); | |
842 | return -ENOMEM; | |
843 | } | |
844 | NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid; | |
845 | ||
846 | err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, | |
847 | IPCTNL_MSG_CT_NEW, 1, ct); | |
848 | nf_ct_put(ct); | |
849 | if (err <= 0) | |
850 | goto free; | |
851 | ||
852 | err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
853 | if (err < 0) | |
854 | goto out; | |
855 | ||
856 | DEBUGP("leaving\n"); | |
857 | return 0; | |
858 | ||
859 | free: | |
860 | kfree_skb(skb2); | |
861 | out: | |
862 | return err; | |
863 | } | |
864 | ||
865 | static inline int | |
866 | ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[]) | |
867 | { | |
868 | unsigned long d; | |
869 | unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1])); | |
870 | d = ct->status ^ status; | |
871 | ||
872 | if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING)) | |
873 | /* unchangeable */ | |
874 | return -EINVAL; | |
875 | ||
876 | if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY)) | |
877 | /* SEEN_REPLY bit can only be set */ | |
878 | return -EINVAL; | |
879 | ||
880 | ||
881 | if (d & IPS_ASSURED && !(status & IPS_ASSURED)) | |
882 | /* ASSURED bit can only be set */ | |
883 | return -EINVAL; | |
884 | ||
3726add7 | 885 | if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { |
c1d10adb PNA |
886 | #ifndef CONFIG_IP_NF_NAT_NEEDED |
887 | return -EINVAL; | |
888 | #else | |
c1d10adb PNA |
889 | struct ip_nat_range range; |
890 | ||
3726add7 PM |
891 | if (cda[CTA_NAT_DST-1]) { |
892 | if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct, | |
893 | &range) < 0) | |
894 | return -EINVAL; | |
895 | if (ip_nat_initialized(ct, | |
896 | HOOK2MANIP(NF_IP_PRE_ROUTING))) | |
897 | return -EEXIST; | |
898 | ip_nat_setup_info(ct, &range, hooknum); | |
899 | } | |
900 | if (cda[CTA_NAT_SRC-1]) { | |
901 | if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct, | |
902 | &range) < 0) | |
903 | return -EINVAL; | |
904 | if (ip_nat_initialized(ct, | |
905 | HOOK2MANIP(NF_IP_POST_ROUTING))) | |
906 | return -EEXIST; | |
907 | ip_nat_setup_info(ct, &range, hooknum); | |
908 | } | |
c1d10adb PNA |
909 | #endif |
910 | } | |
911 | ||
912 | /* Be careful here, modifying NAT bits can screw up things, | |
913 | * so don't let users modify them directly if they don't pass | |
914 | * ip_nat_range. */ | |
915 | ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK); | |
916 | return 0; | |
917 | } | |
918 | ||
919 | ||
920 | static inline int | |
921 | ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[]) | |
922 | { | |
923 | struct nf_conntrack_helper *helper; | |
dc808fe2 | 924 | struct nf_conn_help *help = nfct_help(ct); |
c1d10adb PNA |
925 | char *helpname; |
926 | int err; | |
927 | ||
928 | DEBUGP("entered %s\n", __FUNCTION__); | |
929 | ||
dc808fe2 HW |
930 | if (!help) { |
931 | /* FIXME: we need to reallocate and rehash */ | |
932 | return -EBUSY; | |
933 | } | |
934 | ||
c1d10adb PNA |
935 | /* don't change helper of sibling connections */ |
936 | if (ct->master) | |
937 | return -EINVAL; | |
938 | ||
939 | err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname); | |
940 | if (err < 0) | |
941 | return err; | |
942 | ||
943 | helper = __nf_conntrack_helper_find_byname(helpname); | |
944 | if (!helper) { | |
945 | if (!strcmp(helpname, "")) | |
946 | helper = NULL; | |
947 | else | |
948 | return -EINVAL; | |
949 | } | |
950 | ||
dc808fe2 | 951 | if (help->helper) { |
c1d10adb PNA |
952 | if (!helper) { |
953 | /* we had a helper before ... */ | |
954 | nf_ct_remove_expectations(ct); | |
dc808fe2 | 955 | help->helper = NULL; |
c1d10adb PNA |
956 | } else { |
957 | /* need to zero data of old helper */ | |
dc808fe2 | 958 | memset(&help->help, 0, sizeof(help->help)); |
c1d10adb PNA |
959 | } |
960 | } | |
961 | ||
dc808fe2 | 962 | help->helper = helper; |
c1d10adb PNA |
963 | |
964 | return 0; | |
965 | } | |
966 | ||
967 | static inline int | |
968 | ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[]) | |
969 | { | |
970 | u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1])); | |
971 | ||
972 | if (!del_timer(&ct->timeout)) | |
973 | return -ETIME; | |
974 | ||
975 | ct->timeout.expires = jiffies + timeout * HZ; | |
976 | add_timer(&ct->timeout); | |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
981 | static inline int | |
982 | ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[]) | |
983 | { | |
984 | struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1]; | |
985 | struct nf_conntrack_protocol *proto; | |
986 | u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum; | |
987 | u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
988 | int err = 0; | |
989 | ||
990 | nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr); | |
991 | ||
992 | proto = nf_ct_proto_find_get(l3num, npt); | |
993 | ||
994 | if (proto->from_nfattr) | |
995 | err = proto->from_nfattr(tb, ct); | |
996 | nf_ct_proto_put(proto); | |
997 | ||
998 | return err; | |
999 | } | |
1000 | ||
1001 | static int | |
1002 | ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[]) | |
1003 | { | |
1004 | int err; | |
1005 | ||
1006 | DEBUGP("entered %s\n", __FUNCTION__); | |
1007 | ||
1008 | if (cda[CTA_HELP-1]) { | |
1009 | err = ctnetlink_change_helper(ct, cda); | |
1010 | if (err < 0) | |
1011 | return err; | |
1012 | } | |
1013 | ||
1014 | if (cda[CTA_TIMEOUT-1]) { | |
1015 | err = ctnetlink_change_timeout(ct, cda); | |
1016 | if (err < 0) | |
1017 | return err; | |
1018 | } | |
1019 | ||
1020 | if (cda[CTA_STATUS-1]) { | |
1021 | err = ctnetlink_change_status(ct, cda); | |
1022 | if (err < 0) | |
1023 | return err; | |
1024 | } | |
1025 | ||
1026 | if (cda[CTA_PROTOINFO-1]) { | |
1027 | err = ctnetlink_change_protoinfo(ct, cda); | |
1028 | if (err < 0) | |
1029 | return err; | |
1030 | } | |
1031 | ||
bcd1e830 | 1032 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
c1d10adb PNA |
1033 | if (cda[CTA_MARK-1]) |
1034 | ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1])); | |
1035 | #endif | |
1036 | ||
1037 | DEBUGP("all done\n"); | |
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | static int | |
1042 | ctnetlink_create_conntrack(struct nfattr *cda[], | |
1043 | struct nf_conntrack_tuple *otuple, | |
1044 | struct nf_conntrack_tuple *rtuple) | |
1045 | { | |
1046 | struct nf_conn *ct; | |
1047 | int err = -EINVAL; | |
1048 | ||
1049 | DEBUGP("entered %s\n", __FUNCTION__); | |
1050 | ||
1051 | ct = nf_conntrack_alloc(otuple, rtuple); | |
1052 | if (ct == NULL || IS_ERR(ct)) | |
1053 | return -ENOMEM; | |
1054 | ||
1055 | if (!cda[CTA_TIMEOUT-1]) | |
1056 | goto err; | |
1057 | ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1])); | |
1058 | ||
1059 | ct->timeout.expires = jiffies + ct->timeout.expires * HZ; | |
1060 | ct->status |= IPS_CONFIRMED; | |
1061 | ||
1062 | err = ctnetlink_change_status(ct, cda); | |
1063 | if (err < 0) | |
1064 | goto err; | |
1065 | ||
1066 | if (cda[CTA_PROTOINFO-1]) { | |
1067 | err = ctnetlink_change_protoinfo(ct, cda); | |
1068 | if (err < 0) | |
1069 | return err; | |
1070 | } | |
1071 | ||
bcd1e830 | 1072 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
c1d10adb PNA |
1073 | if (cda[CTA_MARK-1]) |
1074 | ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1])); | |
1075 | #endif | |
1076 | ||
c1d10adb PNA |
1077 | add_timer(&ct->timeout); |
1078 | nf_conntrack_hash_insert(ct); | |
1079 | ||
c1d10adb PNA |
1080 | DEBUGP("conntrack with id %u inserted\n", ct->id); |
1081 | return 0; | |
1082 | ||
1083 | err: | |
1084 | nf_conntrack_free(ct); | |
1085 | return err; | |
1086 | } | |
1087 | ||
1088 | static int | |
1089 | ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, | |
1090 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
1091 | { | |
1092 | struct nf_conntrack_tuple otuple, rtuple; | |
1093 | struct nf_conntrack_tuple_hash *h = NULL; | |
1094 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1095 | u_int8_t u3 = nfmsg->nfgen_family; | |
1096 | int err = 0; | |
1097 | ||
1098 | DEBUGP("entered %s\n", __FUNCTION__); | |
1099 | ||
1100 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) | |
1101 | return -EINVAL; | |
1102 | ||
1103 | if (cda[CTA_TUPLE_ORIG-1]) { | |
1104 | err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3); | |
1105 | if (err < 0) | |
1106 | return err; | |
1107 | } | |
1108 | ||
1109 | if (cda[CTA_TUPLE_REPLY-1]) { | |
1110 | err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3); | |
1111 | if (err < 0) | |
1112 | return err; | |
1113 | } | |
1114 | ||
1115 | write_lock_bh(&nf_conntrack_lock); | |
1116 | if (cda[CTA_TUPLE_ORIG-1]) | |
1117 | h = __nf_conntrack_find(&otuple, NULL); | |
1118 | else if (cda[CTA_TUPLE_REPLY-1]) | |
1119 | h = __nf_conntrack_find(&rtuple, NULL); | |
1120 | ||
1121 | if (h == NULL) { | |
1122 | write_unlock_bh(&nf_conntrack_lock); | |
1123 | DEBUGP("no such conntrack, create new\n"); | |
1124 | err = -ENOENT; | |
1125 | if (nlh->nlmsg_flags & NLM_F_CREATE) | |
1126 | err = ctnetlink_create_conntrack(cda, &otuple, &rtuple); | |
1127 | return err; | |
1128 | } | |
1129 | /* implicit 'else' */ | |
1130 | ||
1131 | /* we only allow nat config for new conntracks */ | |
3726add7 | 1132 | if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { |
c1d10adb PNA |
1133 | err = -EINVAL; |
1134 | goto out_unlock; | |
1135 | } | |
1136 | ||
1137 | /* We manipulate the conntrack inside the global conntrack table lock, | |
1138 | * so there's no need to increase the refcount */ | |
1139 | DEBUGP("conntrack found\n"); | |
1140 | err = -EEXIST; | |
1141 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) | |
1142 | err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda); | |
1143 | ||
1144 | out_unlock: | |
1145 | write_unlock_bh(&nf_conntrack_lock); | |
1146 | return err; | |
1147 | } | |
1148 | ||
1149 | /*********************************************************************** | |
1150 | * EXPECT | |
1151 | ***********************************************************************/ | |
1152 | ||
1153 | static inline int | |
1154 | ctnetlink_exp_dump_tuple(struct sk_buff *skb, | |
1155 | const struct nf_conntrack_tuple *tuple, | |
1156 | enum ctattr_expect type) | |
1157 | { | |
1158 | struct nfattr *nest_parms = NFA_NEST(skb, type); | |
1159 | ||
1160 | if (ctnetlink_dump_tuples(skb, tuple) < 0) | |
1161 | goto nfattr_failure; | |
1162 | ||
1163 | NFA_NEST_END(skb, nest_parms); | |
1164 | ||
1165 | return 0; | |
1166 | ||
1167 | nfattr_failure: | |
1168 | return -1; | |
1169 | } | |
1170 | ||
1cde6436 PNA |
1171 | static inline int |
1172 | ctnetlink_exp_dump_mask(struct sk_buff *skb, | |
1173 | const struct nf_conntrack_tuple *tuple, | |
1174 | const struct nf_conntrack_tuple *mask) | |
1175 | { | |
1176 | int ret; | |
1177 | struct nf_conntrack_l3proto *l3proto; | |
1178 | struct nf_conntrack_protocol *proto; | |
1179 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK); | |
1180 | ||
1181 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); | |
1182 | ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto); | |
1183 | nf_ct_l3proto_put(l3proto); | |
1184 | ||
1185 | if (unlikely(ret < 0)) | |
1186 | goto nfattr_failure; | |
1187 | ||
1188 | proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum); | |
1189 | ret = ctnetlink_dump_tuples_proto(skb, mask, proto); | |
1190 | nf_ct_proto_put(proto); | |
1191 | if (unlikely(ret < 0)) | |
1192 | goto nfattr_failure; | |
1193 | ||
1194 | NFA_NEST_END(skb, nest_parms); | |
1195 | ||
1196 | return 0; | |
1197 | ||
1198 | nfattr_failure: | |
1199 | return -1; | |
1200 | } | |
1201 | ||
c1d10adb PNA |
1202 | static inline int |
1203 | ctnetlink_exp_dump_expect(struct sk_buff *skb, | |
1204 | const struct nf_conntrack_expect *exp) | |
1205 | { | |
1206 | struct nf_conn *master = exp->master; | |
1207 | u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ); | |
1208 | u_int32_t id = htonl(exp->id); | |
1209 | ||
1210 | if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0) | |
1211 | goto nfattr_failure; | |
1cde6436 | 1212 | if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0) |
c1d10adb PNA |
1213 | goto nfattr_failure; |
1214 | if (ctnetlink_exp_dump_tuple(skb, | |
1215 | &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple, | |
1216 | CTA_EXPECT_MASTER) < 0) | |
1217 | goto nfattr_failure; | |
1218 | ||
1219 | NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout); | |
1220 | NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id); | |
1221 | ||
1222 | return 0; | |
1223 | ||
1224 | nfattr_failure: | |
1225 | return -1; | |
1226 | } | |
1227 | ||
1228 | static int | |
1229 | ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq, | |
1230 | int event, | |
1231 | int nowait, | |
1232 | const struct nf_conntrack_expect *exp) | |
1233 | { | |
1234 | struct nlmsghdr *nlh; | |
1235 | struct nfgenmsg *nfmsg; | |
1236 | unsigned char *b; | |
1237 | ||
1238 | b = skb->tail; | |
1239 | ||
1240 | event |= NFNL_SUBSYS_CTNETLINK_EXP << 8; | |
1241 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); | |
1242 | nfmsg = NLMSG_DATA(nlh); | |
1243 | ||
1244 | nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; | |
1245 | nfmsg->nfgen_family = exp->tuple.src.l3num; | |
1246 | nfmsg->version = NFNETLINK_V0; | |
1247 | nfmsg->res_id = 0; | |
1248 | ||
1249 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) | |
1250 | goto nfattr_failure; | |
1251 | ||
1252 | nlh->nlmsg_len = skb->tail - b; | |
1253 | return skb->len; | |
1254 | ||
1255 | nlmsg_failure: | |
1256 | nfattr_failure: | |
1257 | skb_trim(skb, b - skb->data); | |
1258 | return -1; | |
1259 | } | |
1260 | ||
1261 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1262 | static int ctnetlink_expect_event(struct notifier_block *this, | |
1263 | unsigned long events, void *ptr) | |
1264 | { | |
1265 | struct nlmsghdr *nlh; | |
1266 | struct nfgenmsg *nfmsg; | |
1267 | struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr; | |
1268 | struct sk_buff *skb; | |
1269 | unsigned int type; | |
1270 | unsigned char *b; | |
1271 | int flags = 0; | |
1272 | ||
1273 | if (events & IPEXP_NEW) { | |
1274 | type = IPCTNL_MSG_EXP_NEW; | |
1275 | flags = NLM_F_CREATE|NLM_F_EXCL; | |
1276 | } else | |
1277 | return NOTIFY_DONE; | |
1278 | ||
1279 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); | |
1280 | if (!skb) | |
1281 | return NOTIFY_DONE; | |
1282 | ||
1283 | b = skb->tail; | |
1284 | ||
b633ad5f | 1285 | type |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
c1d10adb PNA |
1286 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); |
1287 | nfmsg = NLMSG_DATA(nlh); | |
1288 | ||
1289 | nlh->nlmsg_flags = flags; | |
1290 | nfmsg->nfgen_family = exp->tuple.src.l3num; | |
1291 | nfmsg->version = NFNETLINK_V0; | |
1292 | nfmsg->res_id = 0; | |
1293 | ||
1294 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) | |
1295 | goto nfattr_failure; | |
1296 | ||
1297 | nlh->nlmsg_len = skb->tail - b; | |
1298 | nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0); | |
1299 | return NOTIFY_DONE; | |
1300 | ||
1301 | nlmsg_failure: | |
1302 | nfattr_failure: | |
1303 | kfree_skb(skb); | |
1304 | return NOTIFY_DONE; | |
1305 | } | |
1306 | #endif | |
1307 | ||
1308 | static int | |
1309 | ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb) | |
1310 | { | |
1311 | struct nf_conntrack_expect *exp = NULL; | |
1312 | struct list_head *i; | |
1313 | u_int32_t *id = (u_int32_t *) &cb->args[0]; | |
87711cb8 PNA |
1314 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
1315 | u_int8_t l3proto = nfmsg->nfgen_family; | |
c1d10adb PNA |
1316 | |
1317 | DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id); | |
1318 | ||
1319 | read_lock_bh(&nf_conntrack_lock); | |
1320 | list_for_each_prev(i, &nf_conntrack_expect_list) { | |
1321 | exp = (struct nf_conntrack_expect *) i; | |
87711cb8 PNA |
1322 | if (l3proto && exp->tuple.src.l3num != l3proto) |
1323 | continue; | |
c1d10adb PNA |
1324 | if (exp->id <= *id) |
1325 | continue; | |
1326 | if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
1327 | cb->nlh->nlmsg_seq, | |
1328 | IPCTNL_MSG_EXP_NEW, | |
1329 | 1, exp) < 0) | |
1330 | goto out; | |
1331 | *id = exp->id; | |
1332 | } | |
1333 | out: | |
1334 | read_unlock_bh(&nf_conntrack_lock); | |
1335 | ||
1336 | DEBUGP("leaving, last id=%llu\n", *id); | |
1337 | ||
1338 | return skb->len; | |
1339 | } | |
1340 | ||
1341 | static const size_t cta_min_exp[CTA_EXPECT_MAX] = { | |
1342 | [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t), | |
1343 | [CTA_EXPECT_ID-1] = sizeof(u_int32_t) | |
1344 | }; | |
1345 | ||
1346 | static int | |
1347 | ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, | |
1348 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
1349 | { | |
1350 | struct nf_conntrack_tuple tuple; | |
1351 | struct nf_conntrack_expect *exp; | |
1352 | struct sk_buff *skb2; | |
1353 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1354 | u_int8_t u3 = nfmsg->nfgen_family; | |
1355 | int err = 0; | |
1356 | ||
1357 | DEBUGP("entered %s\n", __FUNCTION__); | |
1358 | ||
1359 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) | |
1360 | return -EINVAL; | |
1361 | ||
1362 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1363 | u32 rlen; | |
1364 | ||
c1d10adb PNA |
1365 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, |
1366 | ctnetlink_exp_dump_table, | |
1367 | ctnetlink_done)) != 0) | |
1368 | return -EINVAL; | |
1369 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1370 | if (rlen > skb->len) | |
1371 | rlen = skb->len; | |
1372 | skb_pull(skb, rlen); | |
1373 | return 0; | |
1374 | } | |
1375 | ||
1376 | if (cda[CTA_EXPECT_MASTER-1]) | |
1377 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3); | |
1378 | else | |
1379 | return -EINVAL; | |
1380 | ||
1381 | if (err < 0) | |
1382 | return err; | |
1383 | ||
1384 | exp = nf_conntrack_expect_find(&tuple); | |
1385 | if (!exp) | |
1386 | return -ENOENT; | |
1387 | ||
1388 | if (cda[CTA_EXPECT_ID-1]) { | |
1389 | u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]); | |
1390 | if (exp->id != ntohl(id)) { | |
1391 | nf_conntrack_expect_put(exp); | |
1392 | return -ENOENT; | |
1393 | } | |
1394 | } | |
1395 | ||
1396 | err = -ENOMEM; | |
1397 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1398 | if (!skb2) | |
1399 | goto out; | |
1400 | NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid; | |
1401 | ||
1402 | err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid, | |
1403 | nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, | |
1404 | 1, exp); | |
1405 | if (err <= 0) | |
1406 | goto free; | |
1407 | ||
1408 | nf_conntrack_expect_put(exp); | |
1409 | ||
1410 | return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1411 | ||
1412 | free: | |
1413 | kfree_skb(skb2); | |
1414 | out: | |
1415 | nf_conntrack_expect_put(exp); | |
1416 | return err; | |
1417 | } | |
1418 | ||
1419 | static int | |
1420 | ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb, | |
1421 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
1422 | { | |
1423 | struct nf_conntrack_expect *exp, *tmp; | |
1424 | struct nf_conntrack_tuple tuple; | |
1425 | struct nf_conntrack_helper *h; | |
1426 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1427 | u_int8_t u3 = nfmsg->nfgen_family; | |
1428 | int err; | |
1429 | ||
1430 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) | |
1431 | return -EINVAL; | |
1432 | ||
1433 | if (cda[CTA_EXPECT_TUPLE-1]) { | |
1434 | /* delete a single expect by tuple */ | |
1435 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); | |
1436 | if (err < 0) | |
1437 | return err; | |
1438 | ||
1439 | /* bump usage count to 2 */ | |
1440 | exp = nf_conntrack_expect_find(&tuple); | |
1441 | if (!exp) | |
1442 | return -ENOENT; | |
1443 | ||
1444 | if (cda[CTA_EXPECT_ID-1]) { | |
1445 | u_int32_t id = | |
1446 | *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]); | |
1447 | if (exp->id != ntohl(id)) { | |
1448 | nf_conntrack_expect_put(exp); | |
1449 | return -ENOENT; | |
1450 | } | |
1451 | } | |
1452 | ||
1453 | /* after list removal, usage count == 1 */ | |
1454 | nf_conntrack_unexpect_related(exp); | |
1455 | /* have to put what we 'get' above. | |
1456 | * after this line usage count == 0 */ | |
1457 | nf_conntrack_expect_put(exp); | |
1458 | } else if (cda[CTA_EXPECT_HELP_NAME-1]) { | |
1459 | char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]); | |
1460 | ||
1461 | /* delete all expectations for this helper */ | |
1462 | write_lock_bh(&nf_conntrack_lock); | |
1463 | h = __nf_conntrack_helper_find_byname(name); | |
1464 | if (!h) { | |
1465 | write_unlock_bh(&nf_conntrack_lock); | |
1466 | return -EINVAL; | |
1467 | } | |
1468 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, | |
1469 | list) { | |
dc808fe2 HW |
1470 | struct nf_conn_help *m_help = nfct_help(exp->master); |
1471 | if (m_help->helper == h | |
c1d10adb PNA |
1472 | && del_timer(&exp->timeout)) { |
1473 | nf_ct_unlink_expect(exp); | |
1474 | nf_conntrack_expect_put(exp); | |
1475 | } | |
1476 | } | |
1477 | write_unlock_bh(&nf_conntrack_lock); | |
1478 | } else { | |
1479 | /* This basically means we have to flush everything*/ | |
1480 | write_lock_bh(&nf_conntrack_lock); | |
1481 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, | |
1482 | list) { | |
1483 | if (del_timer(&exp->timeout)) { | |
1484 | nf_ct_unlink_expect(exp); | |
1485 | nf_conntrack_expect_put(exp); | |
1486 | } | |
1487 | } | |
1488 | write_unlock_bh(&nf_conntrack_lock); | |
1489 | } | |
1490 | ||
1491 | return 0; | |
1492 | } | |
1493 | static int | |
1494 | ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[]) | |
1495 | { | |
1496 | return -EOPNOTSUPP; | |
1497 | } | |
1498 | ||
1499 | static int | |
1500 | ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3) | |
1501 | { | |
1502 | struct nf_conntrack_tuple tuple, mask, master_tuple; | |
1503 | struct nf_conntrack_tuple_hash *h = NULL; | |
1504 | struct nf_conntrack_expect *exp; | |
1505 | struct nf_conn *ct; | |
dc808fe2 | 1506 | struct nf_conn_help *help; |
c1d10adb PNA |
1507 | int err = 0; |
1508 | ||
1509 | DEBUGP("entered %s\n", __FUNCTION__); | |
1510 | ||
1511 | /* caller guarantees that those three CTA_EXPECT_* exist */ | |
1512 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); | |
1513 | if (err < 0) | |
1514 | return err; | |
1515 | err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3); | |
1516 | if (err < 0) | |
1517 | return err; | |
1518 | err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3); | |
1519 | if (err < 0) | |
1520 | return err; | |
1521 | ||
1522 | /* Look for master conntrack of this expectation */ | |
1523 | h = nf_conntrack_find_get(&master_tuple, NULL); | |
1524 | if (!h) | |
1525 | return -ENOENT; | |
1526 | ct = nf_ct_tuplehash_to_ctrack(h); | |
dc808fe2 | 1527 | help = nfct_help(ct); |
c1d10adb | 1528 | |
dc808fe2 | 1529 | if (!help || !help->helper) { |
c1d10adb PNA |
1530 | /* such conntrack hasn't got any helper, abort */ |
1531 | err = -EINVAL; | |
1532 | goto out; | |
1533 | } | |
1534 | ||
1535 | exp = nf_conntrack_expect_alloc(ct); | |
1536 | if (!exp) { | |
1537 | err = -ENOMEM; | |
1538 | goto out; | |
1539 | } | |
1540 | ||
1541 | exp->expectfn = NULL; | |
1542 | exp->flags = 0; | |
1543 | exp->master = ct; | |
1544 | memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple)); | |
1545 | memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple)); | |
1546 | ||
1547 | err = nf_conntrack_expect_related(exp); | |
1548 | nf_conntrack_expect_put(exp); | |
1549 | ||
1550 | out: | |
1551 | nf_ct_put(nf_ct_tuplehash_to_ctrack(h)); | |
1552 | return err; | |
1553 | } | |
1554 | ||
1555 | static int | |
1556 | ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb, | |
1557 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
1558 | { | |
1559 | struct nf_conntrack_tuple tuple; | |
1560 | struct nf_conntrack_expect *exp; | |
1561 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1562 | u_int8_t u3 = nfmsg->nfgen_family; | |
1563 | int err = 0; | |
1564 | ||
1565 | DEBUGP("entered %s\n", __FUNCTION__); | |
1566 | ||
1567 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) | |
1568 | return -EINVAL; | |
1569 | ||
1570 | if (!cda[CTA_EXPECT_TUPLE-1] | |
1571 | || !cda[CTA_EXPECT_MASK-1] | |
1572 | || !cda[CTA_EXPECT_MASTER-1]) | |
1573 | return -EINVAL; | |
1574 | ||
1575 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); | |
1576 | if (err < 0) | |
1577 | return err; | |
1578 | ||
1579 | write_lock_bh(&nf_conntrack_lock); | |
1580 | exp = __nf_conntrack_expect_find(&tuple); | |
1581 | ||
1582 | if (!exp) { | |
1583 | write_unlock_bh(&nf_conntrack_lock); | |
1584 | err = -ENOENT; | |
1585 | if (nlh->nlmsg_flags & NLM_F_CREATE) | |
1586 | err = ctnetlink_create_expect(cda, u3); | |
1587 | return err; | |
1588 | } | |
1589 | ||
1590 | err = -EEXIST; | |
1591 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) | |
1592 | err = ctnetlink_change_expect(exp, cda); | |
1593 | write_unlock_bh(&nf_conntrack_lock); | |
1594 | ||
1595 | DEBUGP("leaving\n"); | |
1596 | ||
1597 | return err; | |
1598 | } | |
1599 | ||
1600 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1601 | static struct notifier_block ctnl_notifier = { | |
1602 | .notifier_call = ctnetlink_conntrack_event, | |
1603 | }; | |
1604 | ||
1605 | static struct notifier_block ctnl_notifier_exp = { | |
1606 | .notifier_call = ctnetlink_expect_event, | |
1607 | }; | |
1608 | #endif | |
1609 | ||
1610 | static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = { | |
1611 | [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack, | |
1612 | .attr_count = CTA_MAX, }, | |
1613 | [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack, | |
1614 | .attr_count = CTA_MAX, }, | |
1615 | [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack, | |
1616 | .attr_count = CTA_MAX, }, | |
1617 | [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack, | |
1618 | .attr_count = CTA_MAX, }, | |
1619 | }; | |
1620 | ||
1621 | static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = { | |
1622 | [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect, | |
1623 | .attr_count = CTA_EXPECT_MAX, }, | |
1624 | [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect, | |
1625 | .attr_count = CTA_EXPECT_MAX, }, | |
1626 | [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect, | |
1627 | .attr_count = CTA_EXPECT_MAX, }, | |
1628 | }; | |
1629 | ||
1630 | static struct nfnetlink_subsystem ctnl_subsys = { | |
1631 | .name = "conntrack", | |
1632 | .subsys_id = NFNL_SUBSYS_CTNETLINK, | |
1633 | .cb_count = IPCTNL_MSG_MAX, | |
1634 | .cb = ctnl_cb, | |
1635 | }; | |
1636 | ||
1637 | static struct nfnetlink_subsystem ctnl_exp_subsys = { | |
1638 | .name = "conntrack_expect", | |
1639 | .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP, | |
1640 | .cb_count = IPCTNL_MSG_EXP_MAX, | |
1641 | .cb = ctnl_exp_cb, | |
1642 | }; | |
1643 | ||
1644 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK); | |
34f9a2e4 | 1645 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP); |
c1d10adb PNA |
1646 | |
1647 | static int __init ctnetlink_init(void) | |
1648 | { | |
1649 | int ret; | |
1650 | ||
1651 | printk("ctnetlink v%s: registering with nfnetlink.\n", version); | |
1652 | ret = nfnetlink_subsys_register(&ctnl_subsys); | |
1653 | if (ret < 0) { | |
1654 | printk("ctnetlink_init: cannot register with nfnetlink.\n"); | |
1655 | goto err_out; | |
1656 | } | |
1657 | ||
1658 | ret = nfnetlink_subsys_register(&ctnl_exp_subsys); | |
1659 | if (ret < 0) { | |
1660 | printk("ctnetlink_init: cannot register exp with nfnetlink.\n"); | |
1661 | goto err_unreg_subsys; | |
1662 | } | |
1663 | ||
1664 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1665 | ret = nf_conntrack_register_notifier(&ctnl_notifier); | |
1666 | if (ret < 0) { | |
1667 | printk("ctnetlink_init: cannot register notifier.\n"); | |
1668 | goto err_unreg_exp_subsys; | |
1669 | } | |
1670 | ||
1671 | ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp); | |
1672 | if (ret < 0) { | |
1673 | printk("ctnetlink_init: cannot expect register notifier.\n"); | |
1674 | goto err_unreg_notifier; | |
1675 | } | |
1676 | #endif | |
1677 | ||
1678 | return 0; | |
1679 | ||
1680 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1681 | err_unreg_notifier: | |
1682 | nf_conntrack_unregister_notifier(&ctnl_notifier); | |
1683 | err_unreg_exp_subsys: | |
1684 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); | |
1685 | #endif | |
1686 | err_unreg_subsys: | |
1687 | nfnetlink_subsys_unregister(&ctnl_subsys); | |
1688 | err_out: | |
1689 | return ret; | |
1690 | } | |
1691 | ||
1692 | static void __exit ctnetlink_exit(void) | |
1693 | { | |
1694 | printk("ctnetlink: unregistering from nfnetlink.\n"); | |
1695 | ||
1696 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
e64a70be | 1697 | nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp); |
c1d10adb PNA |
1698 | nf_conntrack_unregister_notifier(&ctnl_notifier); |
1699 | #endif | |
1700 | ||
1701 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); | |
1702 | nfnetlink_subsys_unregister(&ctnl_subsys); | |
1703 | return; | |
1704 | } | |
1705 | ||
1706 | module_init(ctnetlink_init); | |
1707 | module_exit(ctnetlink_exit); |