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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 | 8 | * |
601e68e1 | 9 | * Initial connection tracking via netlink development funded and |
c1d10adb PNA |
10 | * generally made possible by Network Robots, Inc. (www.networkrobots.com) |
11 | * | |
12 | * Further development of this code funded by Astaro AG (http://www.astaro.com) | |
13 | * | |
14 | * This software may be used and distributed according to the terms | |
15 | * of the GNU General Public License, incorporated herein by reference. | |
c1d10adb PNA |
16 | */ |
17 | ||
18 | #include <linux/init.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/timer.h> | |
23 | #include <linux/skbuff.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/netlink.h> | |
26 | #include <linux/spinlock.h> | |
40a839fd | 27 | #include <linux/interrupt.h> |
c1d10adb PNA |
28 | #include <linux/notifier.h> |
29 | ||
30 | #include <linux/netfilter.h> | |
dc5fc579 | 31 | #include <net/netlink.h> |
c1d10adb PNA |
32 | #include <net/netfilter/nf_conntrack.h> |
33 | #include <net/netfilter/nf_conntrack_core.h> | |
77ab9cff | 34 | #include <net/netfilter/nf_conntrack_expect.h> |
c1d10adb PNA |
35 | #include <net/netfilter/nf_conntrack_helper.h> |
36 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
605dcad6 | 37 | #include <net/netfilter/nf_conntrack_l4proto.h> |
5b1158e9 JK |
38 | #include <net/netfilter/nf_conntrack_tuple.h> |
39 | #ifdef CONFIG_NF_NAT_NEEDED | |
40 | #include <net/netfilter/nf_nat_core.h> | |
41 | #include <net/netfilter/nf_nat_protocol.h> | |
42 | #endif | |
c1d10adb PNA |
43 | |
44 | #include <linux/netfilter/nfnetlink.h> | |
45 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
46 | ||
47 | MODULE_LICENSE("GPL"); | |
48 | ||
dc808fe2 | 49 | static char __initdata version[] = "0.93"; |
c1d10adb | 50 | |
c1d10adb | 51 | static inline int |
601e68e1 | 52 | ctnetlink_dump_tuples_proto(struct sk_buff *skb, |
1cde6436 | 53 | const struct nf_conntrack_tuple *tuple, |
605dcad6 | 54 | struct nf_conntrack_l4proto *l4proto) |
c1d10adb | 55 | { |
c1d10adb | 56 | int ret = 0; |
1cde6436 | 57 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO); |
c1d10adb PNA |
58 | |
59 | NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum); | |
60 | ||
605dcad6 MJ |
61 | if (likely(l4proto->tuple_to_nfattr)) |
62 | ret = l4proto->tuple_to_nfattr(skb, tuple); | |
601e68e1 | 63 | |
1cde6436 | 64 | NFA_NEST_END(skb, nest_parms); |
c1d10adb PNA |
65 | |
66 | return ret; | |
67 | ||
68 | nfattr_failure: | |
69 | return -1; | |
70 | } | |
71 | ||
72 | static inline int | |
1cde6436 PNA |
73 | ctnetlink_dump_tuples_ip(struct sk_buff *skb, |
74 | const struct nf_conntrack_tuple *tuple, | |
75 | struct nf_conntrack_l3proto *l3proto) | |
c1d10adb | 76 | { |
c1d10adb | 77 | int ret = 0; |
1cde6436 PNA |
78 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP); |
79 | ||
c1d10adb PNA |
80 | if (likely(l3proto->tuple_to_nfattr)) |
81 | ret = l3proto->tuple_to_nfattr(skb, tuple); | |
1cde6436 | 82 | |
c1d10adb PNA |
83 | NFA_NEST_END(skb, nest_parms); |
84 | ||
1cde6436 PNA |
85 | return ret; |
86 | ||
87 | nfattr_failure: | |
88 | return -1; | |
89 | } | |
90 | ||
91 | static inline int | |
92 | ctnetlink_dump_tuples(struct sk_buff *skb, | |
93 | const struct nf_conntrack_tuple *tuple) | |
94 | { | |
95 | int ret; | |
96 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 97 | struct nf_conntrack_l4proto *l4proto; |
1cde6436 PNA |
98 | |
99 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); | |
100 | ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto); | |
c1d10adb PNA |
101 | nf_ct_l3proto_put(l3proto); |
102 | ||
103 | if (unlikely(ret < 0)) | |
104 | return ret; | |
105 | ||
605dcad6 MJ |
106 | l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
107 | ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto); | |
108 | nf_ct_l4proto_put(l4proto); | |
c1d10adb PNA |
109 | |
110 | return ret; | |
c1d10adb PNA |
111 | } |
112 | ||
113 | static inline int | |
114 | ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct) | |
115 | { | |
bff9a89b | 116 | __be32 status = htonl((u_int32_t) ct->status); |
c1d10adb PNA |
117 | NFA_PUT(skb, CTA_STATUS, sizeof(status), &status); |
118 | return 0; | |
119 | ||
120 | nfattr_failure: | |
121 | return -1; | |
122 | } | |
123 | ||
124 | static inline int | |
125 | ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct) | |
126 | { | |
127 | long timeout_l = ct->timeout.expires - jiffies; | |
bff9a89b | 128 | __be32 timeout; |
c1d10adb PNA |
129 | |
130 | if (timeout_l < 0) | |
131 | timeout = 0; | |
132 | else | |
133 | timeout = htonl(timeout_l / HZ); | |
601e68e1 | 134 | |
c1d10adb PNA |
135 | NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout); |
136 | return 0; | |
137 | ||
138 | nfattr_failure: | |
139 | return -1; | |
140 | } | |
141 | ||
142 | static inline int | |
143 | ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct) | |
144 | { | |
605dcad6 | 145 | struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum); |
c1d10adb PNA |
146 | struct nfattr *nest_proto; |
147 | int ret; | |
148 | ||
605dcad6 MJ |
149 | if (!l4proto->to_nfattr) { |
150 | nf_ct_l4proto_put(l4proto); | |
c1d10adb PNA |
151 | return 0; |
152 | } | |
601e68e1 | 153 | |
c1d10adb PNA |
154 | nest_proto = NFA_NEST(skb, CTA_PROTOINFO); |
155 | ||
605dcad6 | 156 | ret = l4proto->to_nfattr(skb, nest_proto, ct); |
c1d10adb | 157 | |
605dcad6 | 158 | nf_ct_l4proto_put(l4proto); |
c1d10adb PNA |
159 | |
160 | NFA_NEST_END(skb, nest_proto); | |
161 | ||
162 | return ret; | |
163 | ||
164 | nfattr_failure: | |
605dcad6 | 165 | nf_ct_l4proto_put(l4proto); |
c1d10adb PNA |
166 | return -1; |
167 | } | |
168 | ||
169 | static inline int | |
170 | ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct) | |
171 | { | |
172 | struct nfattr *nest_helper; | |
dc808fe2 | 173 | const struct nf_conn_help *help = nfct_help(ct); |
3c158f7f | 174 | struct nf_conntrack_helper *helper; |
c1d10adb | 175 | |
3c158f7f | 176 | if (!help) |
c1d10adb | 177 | return 0; |
601e68e1 | 178 | |
3c158f7f PM |
179 | rcu_read_lock(); |
180 | helper = rcu_dereference(help->helper); | |
181 | if (!helper) | |
182 | goto out; | |
183 | ||
c1d10adb | 184 | nest_helper = NFA_NEST(skb, CTA_HELP); |
3c158f7f | 185 | NFA_PUT(skb, CTA_HELP_NAME, strlen(helper->name), helper->name); |
c1d10adb | 186 | |
3c158f7f PM |
187 | if (helper->to_nfattr) |
188 | helper->to_nfattr(skb, ct); | |
c1d10adb PNA |
189 | |
190 | NFA_NEST_END(skb, nest_helper); | |
3c158f7f PM |
191 | out: |
192 | rcu_read_unlock(); | |
c1d10adb PNA |
193 | return 0; |
194 | ||
195 | nfattr_failure: | |
3c158f7f | 196 | rcu_read_unlock(); |
c1d10adb PNA |
197 | return -1; |
198 | } | |
199 | ||
200 | #ifdef CONFIG_NF_CT_ACCT | |
201 | static inline int | |
202 | ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct, | |
203 | enum ip_conntrack_dir dir) | |
204 | { | |
205 | enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG; | |
206 | struct nfattr *nest_count = NFA_NEST(skb, type); | |
bff9a89b | 207 | __be32 tmp; |
c1d10adb PNA |
208 | |
209 | tmp = htonl(ct->counters[dir].packets); | |
210 | NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp); | |
211 | ||
212 | tmp = htonl(ct->counters[dir].bytes); | |
213 | NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp); | |
214 | ||
215 | NFA_NEST_END(skb, nest_count); | |
216 | ||
217 | return 0; | |
218 | ||
219 | nfattr_failure: | |
220 | return -1; | |
221 | } | |
222 | #else | |
223 | #define ctnetlink_dump_counters(a, b, c) (0) | |
224 | #endif | |
225 | ||
226 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
227 | static inline int | |
228 | ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct) | |
229 | { | |
bff9a89b | 230 | __be32 mark = htonl(ct->mark); |
c1d10adb PNA |
231 | |
232 | NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark); | |
233 | return 0; | |
234 | ||
235 | nfattr_failure: | |
236 | return -1; | |
237 | } | |
238 | #else | |
239 | #define ctnetlink_dump_mark(a, b) (0) | |
240 | #endif | |
241 | ||
242 | static inline int | |
243 | ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct) | |
244 | { | |
bff9a89b | 245 | __be32 id = htonl(ct->id); |
c1d10adb PNA |
246 | NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id); |
247 | return 0; | |
248 | ||
249 | nfattr_failure: | |
250 | return -1; | |
251 | } | |
252 | ||
253 | static inline int | |
254 | ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct) | |
255 | { | |
bff9a89b | 256 | __be32 use = htonl(atomic_read(&ct->ct_general.use)); |
601e68e1 | 257 | |
c1d10adb PNA |
258 | NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use); |
259 | return 0; | |
260 | ||
261 | nfattr_failure: | |
262 | return -1; | |
263 | } | |
264 | ||
265 | #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple) | |
266 | ||
267 | static int | |
268 | ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, | |
601e68e1 | 269 | int event, int nowait, |
c1d10adb PNA |
270 | const struct nf_conn *ct) |
271 | { | |
272 | struct nlmsghdr *nlh; | |
273 | struct nfgenmsg *nfmsg; | |
274 | struct nfattr *nest_parms; | |
27a884dc | 275 | unsigned char *b = skb_tail_pointer(skb); |
c1d10adb PNA |
276 | |
277 | event |= NFNL_SUBSYS_CTNETLINK << 8; | |
278 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); | |
279 | nfmsg = NLMSG_DATA(nlh); | |
280 | ||
281 | nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; | |
601e68e1 | 282 | nfmsg->nfgen_family = |
c1d10adb PNA |
283 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
284 | nfmsg->version = NFNETLINK_V0; | |
285 | nfmsg->res_id = 0; | |
286 | ||
287 | nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG); | |
288 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) | |
289 | goto nfattr_failure; | |
290 | NFA_NEST_END(skb, nest_parms); | |
601e68e1 | 291 | |
c1d10adb PNA |
292 | nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY); |
293 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) | |
294 | goto nfattr_failure; | |
295 | NFA_NEST_END(skb, nest_parms); | |
296 | ||
297 | if (ctnetlink_dump_status(skb, ct) < 0 || | |
298 | ctnetlink_dump_timeout(skb, ct) < 0 || | |
299 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || | |
300 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 || | |
301 | ctnetlink_dump_protoinfo(skb, ct) < 0 || | |
302 | ctnetlink_dump_helpinfo(skb, ct) < 0 || | |
303 | ctnetlink_dump_mark(skb, ct) < 0 || | |
304 | ctnetlink_dump_id(skb, ct) < 0 || | |
305 | ctnetlink_dump_use(skb, ct) < 0) | |
306 | goto nfattr_failure; | |
307 | ||
27a884dc | 308 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
c1d10adb PNA |
309 | return skb->len; |
310 | ||
311 | nlmsg_failure: | |
312 | nfattr_failure: | |
dc5fc579 | 313 | nlmsg_trim(skb, b); |
c1d10adb PNA |
314 | return -1; |
315 | } | |
316 | ||
317 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
318 | static int ctnetlink_conntrack_event(struct notifier_block *this, | |
601e68e1 | 319 | unsigned long events, void *ptr) |
c1d10adb PNA |
320 | { |
321 | struct nlmsghdr *nlh; | |
322 | struct nfgenmsg *nfmsg; | |
323 | struct nfattr *nest_parms; | |
324 | struct nf_conn *ct = (struct nf_conn *)ptr; | |
325 | struct sk_buff *skb; | |
326 | unsigned int type; | |
27a884dc | 327 | sk_buff_data_t b; |
c1d10adb PNA |
328 | unsigned int flags = 0, group; |
329 | ||
330 | /* ignore our fake conntrack entry */ | |
331 | if (ct == &nf_conntrack_untracked) | |
332 | return NOTIFY_DONE; | |
333 | ||
334 | if (events & IPCT_DESTROY) { | |
335 | type = IPCTNL_MSG_CT_DELETE; | |
336 | group = NFNLGRP_CONNTRACK_DESTROY; | |
337 | } else if (events & (IPCT_NEW | IPCT_RELATED)) { | |
338 | type = IPCTNL_MSG_CT_NEW; | |
339 | flags = NLM_F_CREATE|NLM_F_EXCL; | |
c1d10adb | 340 | group = NFNLGRP_CONNTRACK_NEW; |
1a31526b | 341 | } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) { |
c1d10adb PNA |
342 | type = IPCTNL_MSG_CT_NEW; |
343 | group = NFNLGRP_CONNTRACK_UPDATE; | |
344 | } else | |
345 | return NOTIFY_DONE; | |
a2427692 PM |
346 | |
347 | if (!nfnetlink_has_listeners(group)) | |
348 | return NOTIFY_DONE; | |
349 | ||
c1d10adb PNA |
350 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
351 | if (!skb) | |
352 | return NOTIFY_DONE; | |
353 | ||
354 | b = skb->tail; | |
355 | ||
356 | type |= NFNL_SUBSYS_CTNETLINK << 8; | |
357 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); | |
358 | nfmsg = NLMSG_DATA(nlh); | |
359 | ||
360 | nlh->nlmsg_flags = flags; | |
361 | nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
362 | nfmsg->version = NFNETLINK_V0; | |
363 | nfmsg->res_id = 0; | |
364 | ||
365 | nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG); | |
366 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) | |
367 | goto nfattr_failure; | |
368 | NFA_NEST_END(skb, nest_parms); | |
601e68e1 | 369 | |
c1d10adb PNA |
370 | nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY); |
371 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) | |
372 | goto nfattr_failure; | |
373 | NFA_NEST_END(skb, nest_parms); | |
c1d10adb | 374 | |
7b621c1e PNA |
375 | if (events & IPCT_DESTROY) { |
376 | if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || | |
377 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0) | |
378 | goto nfattr_failure; | |
379 | } else { | |
380 | if (ctnetlink_dump_status(skb, ct) < 0) | |
381 | goto nfattr_failure; | |
382 | ||
383 | if (ctnetlink_dump_timeout(skb, ct) < 0) | |
384 | goto nfattr_failure; | |
385 | ||
386 | if (events & IPCT_PROTOINFO | |
387 | && ctnetlink_dump_protoinfo(skb, ct) < 0) | |
601e68e1 | 388 | goto nfattr_failure; |
7b621c1e PNA |
389 | |
390 | if ((events & IPCT_HELPER || nfct_help(ct)) | |
391 | && ctnetlink_dump_helpinfo(skb, ct) < 0) | |
601e68e1 | 392 | goto nfattr_failure; |
7b621c1e | 393 | |
40e0cb00 | 394 | #ifdef CONFIG_NF_CONNTRACK_MARK |
7b621c1e PNA |
395 | if ((events & IPCT_MARK || ct->mark) |
396 | && ctnetlink_dump_mark(skb, ct) < 0) | |
601e68e1 | 397 | goto nfattr_failure; |
40e0cb00 | 398 | #endif |
7b621c1e PNA |
399 | |
400 | if (events & IPCT_COUNTER_FILLING && | |
401 | (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || | |
402 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)) | |
403 | goto nfattr_failure; | |
404 | } | |
b9a37e0c | 405 | |
c1d10adb PNA |
406 | nlh->nlmsg_len = skb->tail - b; |
407 | nfnetlink_send(skb, 0, group, 0); | |
408 | return NOTIFY_DONE; | |
409 | ||
410 | nlmsg_failure: | |
411 | nfattr_failure: | |
412 | kfree_skb(skb); | |
413 | return NOTIFY_DONE; | |
414 | } | |
415 | #endif /* CONFIG_NF_CONNTRACK_EVENTS */ | |
416 | ||
417 | static int ctnetlink_done(struct netlink_callback *cb) | |
418 | { | |
89f2e218 PM |
419 | if (cb->args[1]) |
420 | nf_ct_put((struct nf_conn *)cb->args[1]); | |
c1d10adb PNA |
421 | return 0; |
422 | } | |
423 | ||
87711cb8 PNA |
424 | #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num |
425 | ||
c1d10adb PNA |
426 | static int |
427 | ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb) | |
428 | { | |
89f2e218 | 429 | struct nf_conn *ct, *last; |
c1d10adb PNA |
430 | struct nf_conntrack_tuple_hash *h; |
431 | struct list_head *i; | |
87711cb8 PNA |
432 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
433 | u_int8_t l3proto = nfmsg->nfgen_family; | |
c1d10adb | 434 | |
c1d10adb | 435 | read_lock_bh(&nf_conntrack_lock); |
d205dc40 | 436 | last = (struct nf_conn *)cb->args[1]; |
89f2e218 PM |
437 | for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) { |
438 | restart: | |
c1d10adb PNA |
439 | list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) { |
440 | h = (struct nf_conntrack_tuple_hash *) i; | |
5b1158e9 | 441 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
c1d10adb PNA |
442 | continue; |
443 | ct = nf_ct_tuplehash_to_ctrack(h); | |
87711cb8 PNA |
444 | /* Dump entries of a given L3 protocol number. |
445 | * If it is not specified, ie. l3proto == 0, | |
446 | * then dump everything. */ | |
447 | if (l3proto && L3PROTO(ct) != l3proto) | |
448 | continue; | |
d205dc40 PM |
449 | if (cb->args[1]) { |
450 | if (ct != last) | |
89f2e218 | 451 | continue; |
d205dc40 | 452 | cb->args[1] = 0; |
89f2e218 | 453 | } |
c1d10adb | 454 | if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid, |
601e68e1 | 455 | cb->nlh->nlmsg_seq, |
c1d10adb | 456 | IPCTNL_MSG_CT_NEW, |
89f2e218 PM |
457 | 1, ct) < 0) { |
458 | nf_conntrack_get(&ct->ct_general); | |
459 | cb->args[1] = (unsigned long)ct; | |
c1d10adb | 460 | goto out; |
89f2e218 | 461 | } |
01f34848 PNA |
462 | #ifdef CONFIG_NF_CT_ACCT |
463 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == | |
464 | IPCTNL_MSG_CT_GET_CTRZERO) | |
465 | memset(&ct->counters, 0, sizeof(ct->counters)); | |
466 | #endif | |
89f2e218 | 467 | } |
d205dc40 | 468 | if (cb->args[1]) { |
89f2e218 PM |
469 | cb->args[1] = 0; |
470 | goto restart; | |
c1d10adb PNA |
471 | } |
472 | } | |
89f2e218 | 473 | out: |
c1d10adb | 474 | read_unlock_bh(&nf_conntrack_lock); |
d205dc40 PM |
475 | if (last) |
476 | nf_ct_put(last); | |
c1d10adb | 477 | |
c1d10adb PNA |
478 | return skb->len; |
479 | } | |
480 | ||
c1d10adb PNA |
481 | static inline int |
482 | ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple) | |
483 | { | |
484 | struct nfattr *tb[CTA_IP_MAX]; | |
485 | struct nf_conntrack_l3proto *l3proto; | |
486 | int ret = 0; | |
487 | ||
c1d10adb PNA |
488 | nfattr_parse_nested(tb, CTA_IP_MAX, attr); |
489 | ||
490 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); | |
491 | ||
492 | if (likely(l3proto->nfattr_to_tuple)) | |
493 | ret = l3proto->nfattr_to_tuple(tb, tuple); | |
494 | ||
495 | nf_ct_l3proto_put(l3proto); | |
496 | ||
c1d10adb PNA |
497 | return ret; |
498 | } | |
499 | ||
500 | static const size_t cta_min_proto[CTA_PROTO_MAX] = { | |
501 | [CTA_PROTO_NUM-1] = sizeof(u_int8_t), | |
502 | }; | |
503 | ||
504 | static inline int | |
601e68e1 | 505 | ctnetlink_parse_tuple_proto(struct nfattr *attr, |
c1d10adb PNA |
506 | struct nf_conntrack_tuple *tuple) |
507 | { | |
508 | struct nfattr *tb[CTA_PROTO_MAX]; | |
605dcad6 | 509 | struct nf_conntrack_l4proto *l4proto; |
c1d10adb PNA |
510 | int ret = 0; |
511 | ||
c1d10adb PNA |
512 | nfattr_parse_nested(tb, CTA_PROTO_MAX, attr); |
513 | ||
514 | if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto)) | |
515 | return -EINVAL; | |
516 | ||
517 | if (!tb[CTA_PROTO_NUM-1]) | |
518 | return -EINVAL; | |
519 | tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]); | |
520 | ||
605dcad6 | 521 | l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
c1d10adb | 522 | |
605dcad6 MJ |
523 | if (likely(l4proto->nfattr_to_tuple)) |
524 | ret = l4proto->nfattr_to_tuple(tb, tuple); | |
c1d10adb | 525 | |
605dcad6 | 526 | nf_ct_l4proto_put(l4proto); |
601e68e1 | 527 | |
c1d10adb PNA |
528 | return ret; |
529 | } | |
530 | ||
531 | static inline int | |
532 | ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple, | |
533 | enum ctattr_tuple type, u_int8_t l3num) | |
534 | { | |
535 | struct nfattr *tb[CTA_TUPLE_MAX]; | |
536 | int err; | |
537 | ||
c1d10adb PNA |
538 | memset(tuple, 0, sizeof(*tuple)); |
539 | ||
540 | nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]); | |
541 | ||
542 | if (!tb[CTA_TUPLE_IP-1]) | |
543 | return -EINVAL; | |
544 | ||
545 | tuple->src.l3num = l3num; | |
546 | ||
547 | err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple); | |
548 | if (err < 0) | |
549 | return err; | |
550 | ||
551 | if (!tb[CTA_TUPLE_PROTO-1]) | |
552 | return -EINVAL; | |
553 | ||
554 | err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple); | |
555 | if (err < 0) | |
556 | return err; | |
557 | ||
558 | /* orig and expect tuples get DIR_ORIGINAL */ | |
559 | if (type == CTA_TUPLE_REPLY) | |
560 | tuple->dst.dir = IP_CT_DIR_REPLY; | |
561 | else | |
562 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
563 | ||
c1d10adb PNA |
564 | return 0; |
565 | } | |
566 | ||
5b1158e9 | 567 | #ifdef CONFIG_NF_NAT_NEEDED |
c1d10adb PNA |
568 | static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = { |
569 | [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t), | |
570 | [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t), | |
571 | }; | |
572 | ||
5b1158e9 | 573 | static int nfnetlink_parse_nat_proto(struct nfattr *attr, |
c1d10adb | 574 | const struct nf_conn *ct, |
5b1158e9 | 575 | struct nf_nat_range *range) |
c1d10adb PNA |
576 | { |
577 | struct nfattr *tb[CTA_PROTONAT_MAX]; | |
5b1158e9 | 578 | struct nf_nat_protocol *npt; |
c1d10adb | 579 | |
c1d10adb PNA |
580 | nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr); |
581 | ||
582 | if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat)) | |
583 | return -EINVAL; | |
584 | ||
5b1158e9 | 585 | npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum); |
c1d10adb PNA |
586 | |
587 | if (!npt->nfattr_to_range) { | |
5b1158e9 | 588 | nf_nat_proto_put(npt); |
c1d10adb PNA |
589 | return 0; |
590 | } | |
591 | ||
592 | /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */ | |
593 | if (npt->nfattr_to_range(tb, range) > 0) | |
594 | range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED; | |
595 | ||
5b1158e9 | 596 | nf_nat_proto_put(npt); |
c1d10adb | 597 | |
c1d10adb PNA |
598 | return 0; |
599 | } | |
600 | ||
601 | static const size_t cta_min_nat[CTA_NAT_MAX] = { | |
602 | [CTA_NAT_MINIP-1] = sizeof(u_int32_t), | |
603 | [CTA_NAT_MAXIP-1] = sizeof(u_int32_t), | |
604 | }; | |
605 | ||
606 | static inline int | |
5b1158e9 JK |
607 | nfnetlink_parse_nat(struct nfattr *nat, |
608 | const struct nf_conn *ct, struct nf_nat_range *range) | |
c1d10adb PNA |
609 | { |
610 | struct nfattr *tb[CTA_NAT_MAX]; | |
611 | int err; | |
612 | ||
c1d10adb | 613 | memset(range, 0, sizeof(*range)); |
601e68e1 | 614 | |
3726add7 | 615 | nfattr_parse_nested(tb, CTA_NAT_MAX, nat); |
c1d10adb PNA |
616 | |
617 | if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat)) | |
618 | return -EINVAL; | |
619 | ||
620 | if (tb[CTA_NAT_MINIP-1]) | |
bff9a89b | 621 | range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]); |
c1d10adb PNA |
622 | |
623 | if (!tb[CTA_NAT_MAXIP-1]) | |
624 | range->max_ip = range->min_ip; | |
625 | else | |
bff9a89b | 626 | range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]); |
c1d10adb PNA |
627 | |
628 | if (range->min_ip) | |
629 | range->flags |= IP_NAT_RANGE_MAP_IPS; | |
630 | ||
631 | if (!tb[CTA_NAT_PROTO-1]) | |
632 | return 0; | |
633 | ||
5b1158e9 | 634 | err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range); |
c1d10adb PNA |
635 | if (err < 0) |
636 | return err; | |
637 | ||
c1d10adb PNA |
638 | return 0; |
639 | } | |
640 | #endif | |
641 | ||
642 | static inline int | |
643 | ctnetlink_parse_help(struct nfattr *attr, char **helper_name) | |
644 | { | |
645 | struct nfattr *tb[CTA_HELP_MAX]; | |
646 | ||
c1d10adb PNA |
647 | nfattr_parse_nested(tb, CTA_HELP_MAX, attr); |
648 | ||
649 | if (!tb[CTA_HELP_NAME-1]) | |
650 | return -EINVAL; | |
651 | ||
652 | *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]); | |
653 | ||
654 | return 0; | |
655 | } | |
656 | ||
657 | static const size_t cta_min[CTA_MAX] = { | |
658 | [CTA_STATUS-1] = sizeof(u_int32_t), | |
659 | [CTA_TIMEOUT-1] = sizeof(u_int32_t), | |
660 | [CTA_MARK-1] = sizeof(u_int32_t), | |
661 | [CTA_USE-1] = sizeof(u_int32_t), | |
662 | [CTA_ID-1] = sizeof(u_int32_t) | |
663 | }; | |
664 | ||
665 | static int | |
601e68e1 | 666 | ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, |
1d00a4eb | 667 | struct nlmsghdr *nlh, struct nfattr *cda[]) |
c1d10adb PNA |
668 | { |
669 | struct nf_conntrack_tuple_hash *h; | |
670 | struct nf_conntrack_tuple tuple; | |
671 | struct nf_conn *ct; | |
672 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
673 | u_int8_t u3 = nfmsg->nfgen_family; | |
674 | int err = 0; | |
675 | ||
c1d10adb PNA |
676 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
677 | return -EINVAL; | |
678 | ||
679 | if (cda[CTA_TUPLE_ORIG-1]) | |
680 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); | |
681 | else if (cda[CTA_TUPLE_REPLY-1]) | |
682 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); | |
683 | else { | |
684 | /* Flush the whole table */ | |
685 | nf_conntrack_flush(); | |
686 | return 0; | |
687 | } | |
688 | ||
689 | if (err < 0) | |
690 | return err; | |
691 | ||
692 | h = nf_conntrack_find_get(&tuple, NULL); | |
9ea8cfd6 | 693 | if (!h) |
c1d10adb | 694 | return -ENOENT; |
c1d10adb PNA |
695 | |
696 | ct = nf_ct_tuplehash_to_ctrack(h); | |
601e68e1 | 697 | |
c1d10adb | 698 | if (cda[CTA_ID-1]) { |
bff9a89b | 699 | u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1])); |
c1d10adb PNA |
700 | if (ct->id != id) { |
701 | nf_ct_put(ct); | |
702 | return -ENOENT; | |
703 | } | |
601e68e1 | 704 | } |
c1d10adb PNA |
705 | if (del_timer(&ct->timeout)) |
706 | ct->timeout.function((unsigned long)ct); | |
707 | ||
708 | nf_ct_put(ct); | |
c1d10adb PNA |
709 | |
710 | return 0; | |
711 | } | |
712 | ||
713 | static int | |
601e68e1 | 714 | ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, |
1d00a4eb | 715 | struct nlmsghdr *nlh, struct nfattr *cda[]) |
c1d10adb PNA |
716 | { |
717 | struct nf_conntrack_tuple_hash *h; | |
718 | struct nf_conntrack_tuple tuple; | |
719 | struct nf_conn *ct; | |
720 | struct sk_buff *skb2 = NULL; | |
721 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
722 | u_int8_t u3 = nfmsg->nfgen_family; | |
723 | int err = 0; | |
724 | ||
c1d10adb | 725 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
01f34848 PNA |
726 | #ifndef CONFIG_NF_CT_ACCT |
727 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO) | |
c1d10adb PNA |
728 | return -ENOTSUPP; |
729 | #endif | |
c702e804 TG |
730 | return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table, |
731 | ctnetlink_done); | |
c1d10adb PNA |
732 | } |
733 | ||
734 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) | |
735 | return -EINVAL; | |
736 | ||
737 | if (cda[CTA_TUPLE_ORIG-1]) | |
738 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); | |
739 | else if (cda[CTA_TUPLE_REPLY-1]) | |
740 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); | |
741 | else | |
742 | return -EINVAL; | |
743 | ||
744 | if (err < 0) | |
745 | return err; | |
746 | ||
747 | h = nf_conntrack_find_get(&tuple, NULL); | |
9ea8cfd6 | 748 | if (!h) |
c1d10adb | 749 | return -ENOENT; |
9ea8cfd6 | 750 | |
c1d10adb PNA |
751 | ct = nf_ct_tuplehash_to_ctrack(h); |
752 | ||
753 | err = -ENOMEM; | |
754 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
755 | if (!skb2) { | |
756 | nf_ct_put(ct); | |
757 | return -ENOMEM; | |
758 | } | |
c1d10adb | 759 | |
601e68e1 | 760 | err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, |
c1d10adb PNA |
761 | IPCTNL_MSG_CT_NEW, 1, ct); |
762 | nf_ct_put(ct); | |
763 | if (err <= 0) | |
764 | goto free; | |
765 | ||
766 | err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
767 | if (err < 0) | |
768 | goto out; | |
769 | ||
c1d10adb PNA |
770 | return 0; |
771 | ||
772 | free: | |
773 | kfree_skb(skb2); | |
774 | out: | |
775 | return err; | |
776 | } | |
777 | ||
778 | static inline int | |
779 | ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[]) | |
780 | { | |
781 | unsigned long d; | |
bff9a89b | 782 | unsigned int status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1])); |
c1d10adb PNA |
783 | d = ct->status ^ status; |
784 | ||
785 | if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING)) | |
786 | /* unchangeable */ | |
787 | return -EINVAL; | |
601e68e1 | 788 | |
c1d10adb PNA |
789 | if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY)) |
790 | /* SEEN_REPLY bit can only be set */ | |
791 | return -EINVAL; | |
792 | ||
601e68e1 | 793 | |
c1d10adb PNA |
794 | if (d & IPS_ASSURED && !(status & IPS_ASSURED)) |
795 | /* ASSURED bit can only be set */ | |
796 | return -EINVAL; | |
797 | ||
3726add7 | 798 | if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { |
5b1158e9 | 799 | #ifndef CONFIG_NF_NAT_NEEDED |
c1d10adb PNA |
800 | return -EINVAL; |
801 | #else | |
5b1158e9 | 802 | struct nf_nat_range range; |
c1d10adb | 803 | |
3726add7 | 804 | if (cda[CTA_NAT_DST-1]) { |
5b1158e9 | 805 | if (nfnetlink_parse_nat(cda[CTA_NAT_DST-1], ct, |
3726add7 PM |
806 | &range) < 0) |
807 | return -EINVAL; | |
5b1158e9 | 808 | if (nf_nat_initialized(ct, |
3726add7 PM |
809 | HOOK2MANIP(NF_IP_PRE_ROUTING))) |
810 | return -EEXIST; | |
5b1158e9 | 811 | nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING); |
3726add7 PM |
812 | } |
813 | if (cda[CTA_NAT_SRC-1]) { | |
5b1158e9 | 814 | if (nfnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct, |
3726add7 PM |
815 | &range) < 0) |
816 | return -EINVAL; | |
5b1158e9 | 817 | if (nf_nat_initialized(ct, |
3726add7 PM |
818 | HOOK2MANIP(NF_IP_POST_ROUTING))) |
819 | return -EEXIST; | |
5b1158e9 | 820 | nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING); |
3726add7 | 821 | } |
c1d10adb PNA |
822 | #endif |
823 | } | |
824 | ||
825 | /* Be careful here, modifying NAT bits can screw up things, | |
826 | * so don't let users modify them directly if they don't pass | |
5b1158e9 | 827 | * nf_nat_range. */ |
c1d10adb PNA |
828 | ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK); |
829 | return 0; | |
830 | } | |
831 | ||
832 | ||
833 | static inline int | |
834 | ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[]) | |
835 | { | |
836 | struct nf_conntrack_helper *helper; | |
dc808fe2 | 837 | struct nf_conn_help *help = nfct_help(ct); |
c1d10adb PNA |
838 | char *helpname; |
839 | int err; | |
840 | ||
c1d10adb PNA |
841 | /* don't change helper of sibling connections */ |
842 | if (ct->master) | |
843 | return -EINVAL; | |
844 | ||
845 | err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname); | |
846 | if (err < 0) | |
847 | return err; | |
848 | ||
df293bbb YK |
849 | if (!strcmp(helpname, "")) { |
850 | if (help && help->helper) { | |
c1d10adb PNA |
851 | /* we had a helper before ... */ |
852 | nf_ct_remove_expectations(ct); | |
3c158f7f | 853 | rcu_assign_pointer(help->helper, NULL); |
c1d10adb | 854 | } |
df293bbb YK |
855 | |
856 | return 0; | |
c1d10adb | 857 | } |
601e68e1 | 858 | |
df293bbb YK |
859 | if (!help) { |
860 | /* FIXME: we need to reallocate and rehash */ | |
861 | return -EBUSY; | |
862 | } | |
863 | ||
864 | helper = __nf_conntrack_helper_find_byname(helpname); | |
865 | if (helper == NULL) | |
866 | return -EINVAL; | |
867 | ||
868 | if (help->helper == helper) | |
869 | return 0; | |
870 | ||
871 | if (help->helper) | |
e2d8e314 | 872 | return -EBUSY; |
df293bbb YK |
873 | |
874 | /* need to zero data of old helper */ | |
875 | memset(&help->help, 0, sizeof(help->help)); | |
3c158f7f | 876 | rcu_assign_pointer(help->helper, helper); |
c1d10adb PNA |
877 | |
878 | return 0; | |
879 | } | |
880 | ||
881 | static inline int | |
882 | ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[]) | |
883 | { | |
bff9a89b | 884 | u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1])); |
601e68e1 | 885 | |
c1d10adb PNA |
886 | if (!del_timer(&ct->timeout)) |
887 | return -ETIME; | |
888 | ||
889 | ct->timeout.expires = jiffies + timeout * HZ; | |
890 | add_timer(&ct->timeout); | |
891 | ||
892 | return 0; | |
893 | } | |
894 | ||
895 | static inline int | |
896 | ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[]) | |
897 | { | |
898 | struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1]; | |
605dcad6 | 899 | struct nf_conntrack_l4proto *l4proto; |
c1d10adb PNA |
900 | u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum; |
901 | u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
902 | int err = 0; | |
903 | ||
904 | nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr); | |
905 | ||
605dcad6 | 906 | l4proto = nf_ct_l4proto_find_get(l3num, npt); |
c1d10adb | 907 | |
605dcad6 MJ |
908 | if (l4proto->from_nfattr) |
909 | err = l4proto->from_nfattr(tb, ct); | |
910 | nf_ct_l4proto_put(l4proto); | |
c1d10adb PNA |
911 | |
912 | return err; | |
913 | } | |
914 | ||
915 | static int | |
916 | ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[]) | |
917 | { | |
918 | int err; | |
919 | ||
c1d10adb PNA |
920 | if (cda[CTA_HELP-1]) { |
921 | err = ctnetlink_change_helper(ct, cda); | |
922 | if (err < 0) | |
923 | return err; | |
924 | } | |
925 | ||
926 | if (cda[CTA_TIMEOUT-1]) { | |
927 | err = ctnetlink_change_timeout(ct, cda); | |
928 | if (err < 0) | |
929 | return err; | |
930 | } | |
931 | ||
932 | if (cda[CTA_STATUS-1]) { | |
933 | err = ctnetlink_change_status(ct, cda); | |
934 | if (err < 0) | |
935 | return err; | |
936 | } | |
937 | ||
938 | if (cda[CTA_PROTOINFO-1]) { | |
939 | err = ctnetlink_change_protoinfo(ct, cda); | |
940 | if (err < 0) | |
941 | return err; | |
942 | } | |
943 | ||
bcd1e830 | 944 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
c1d10adb | 945 | if (cda[CTA_MARK-1]) |
bff9a89b | 946 | ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1])); |
c1d10adb PNA |
947 | #endif |
948 | ||
c1d10adb PNA |
949 | return 0; |
950 | } | |
951 | ||
952 | static int | |
601e68e1 | 953 | ctnetlink_create_conntrack(struct nfattr *cda[], |
c1d10adb PNA |
954 | struct nf_conntrack_tuple *otuple, |
955 | struct nf_conntrack_tuple *rtuple) | |
956 | { | |
957 | struct nf_conn *ct; | |
958 | int err = -EINVAL; | |
dafc741c | 959 | struct nf_conn_help *help; |
3c158f7f | 960 | struct nf_conntrack_helper *helper = NULL; |
c1d10adb | 961 | |
c1d10adb PNA |
962 | ct = nf_conntrack_alloc(otuple, rtuple); |
963 | if (ct == NULL || IS_ERR(ct)) | |
601e68e1 | 964 | return -ENOMEM; |
c1d10adb PNA |
965 | |
966 | if (!cda[CTA_TIMEOUT-1]) | |
967 | goto err; | |
bff9a89b | 968 | ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1])); |
c1d10adb PNA |
969 | |
970 | ct->timeout.expires = jiffies + ct->timeout.expires * HZ; | |
971 | ct->status |= IPS_CONFIRMED; | |
972 | ||
bbb3357d PNA |
973 | if (cda[CTA_STATUS-1]) { |
974 | err = ctnetlink_change_status(ct, cda); | |
975 | if (err < 0) | |
976 | goto err; | |
977 | } | |
c1d10adb PNA |
978 | |
979 | if (cda[CTA_PROTOINFO-1]) { | |
980 | err = ctnetlink_change_protoinfo(ct, cda); | |
981 | if (err < 0) | |
c54ea3b9 | 982 | goto err; |
c1d10adb PNA |
983 | } |
984 | ||
bcd1e830 | 985 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
c1d10adb | 986 | if (cda[CTA_MARK-1]) |
bff9a89b | 987 | ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1])); |
c1d10adb PNA |
988 | #endif |
989 | ||
dafc741c | 990 | help = nfct_help(ct); |
3c158f7f PM |
991 | if (help) { |
992 | helper = nf_ct_helper_find_get(rtuple); | |
993 | /* not in hash table yet so not strictly necessary */ | |
994 | rcu_assign_pointer(help->helper, helper); | |
995 | } | |
dafc741c | 996 | |
c1d10adb PNA |
997 | add_timer(&ct->timeout); |
998 | nf_conntrack_hash_insert(ct); | |
999 | ||
3c158f7f PM |
1000 | if (helper) |
1001 | nf_ct_helper_put(helper); | |
dafc741c | 1002 | |
c1d10adb PNA |
1003 | return 0; |
1004 | ||
601e68e1 | 1005 | err: |
c1d10adb PNA |
1006 | nf_conntrack_free(ct); |
1007 | return err; | |
1008 | } | |
1009 | ||
601e68e1 YH |
1010 | static int |
1011 | ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, | |
1d00a4eb | 1012 | struct nlmsghdr *nlh, struct nfattr *cda[]) |
c1d10adb PNA |
1013 | { |
1014 | struct nf_conntrack_tuple otuple, rtuple; | |
1015 | struct nf_conntrack_tuple_hash *h = NULL; | |
1016 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1017 | u_int8_t u3 = nfmsg->nfgen_family; | |
1018 | int err = 0; | |
1019 | ||
c1d10adb PNA |
1020 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
1021 | return -EINVAL; | |
1022 | ||
1023 | if (cda[CTA_TUPLE_ORIG-1]) { | |
1024 | err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3); | |
1025 | if (err < 0) | |
1026 | return err; | |
1027 | } | |
1028 | ||
1029 | if (cda[CTA_TUPLE_REPLY-1]) { | |
1030 | err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3); | |
1031 | if (err < 0) | |
1032 | return err; | |
1033 | } | |
1034 | ||
1035 | write_lock_bh(&nf_conntrack_lock); | |
1036 | if (cda[CTA_TUPLE_ORIG-1]) | |
1037 | h = __nf_conntrack_find(&otuple, NULL); | |
1038 | else if (cda[CTA_TUPLE_REPLY-1]) | |
1039 | h = __nf_conntrack_find(&rtuple, NULL); | |
1040 | ||
1041 | if (h == NULL) { | |
1042 | write_unlock_bh(&nf_conntrack_lock); | |
c1d10adb PNA |
1043 | err = -ENOENT; |
1044 | if (nlh->nlmsg_flags & NLM_F_CREATE) | |
1045 | err = ctnetlink_create_conntrack(cda, &otuple, &rtuple); | |
1046 | return err; | |
1047 | } | |
1048 | /* implicit 'else' */ | |
1049 | ||
1050 | /* we only allow nat config for new conntracks */ | |
3726add7 | 1051 | if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { |
c1d10adb PNA |
1052 | err = -EINVAL; |
1053 | goto out_unlock; | |
1054 | } | |
1055 | ||
1056 | /* We manipulate the conntrack inside the global conntrack table lock, | |
1057 | * so there's no need to increase the refcount */ | |
c1d10adb PNA |
1058 | err = -EEXIST; |
1059 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) | |
1060 | err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda); | |
1061 | ||
1062 | out_unlock: | |
1063 | write_unlock_bh(&nf_conntrack_lock); | |
1064 | return err; | |
1065 | } | |
1066 | ||
601e68e1 YH |
1067 | /*********************************************************************** |
1068 | * EXPECT | |
1069 | ***********************************************************************/ | |
c1d10adb PNA |
1070 | |
1071 | static inline int | |
1072 | ctnetlink_exp_dump_tuple(struct sk_buff *skb, | |
1073 | const struct nf_conntrack_tuple *tuple, | |
1074 | enum ctattr_expect type) | |
1075 | { | |
1076 | struct nfattr *nest_parms = NFA_NEST(skb, type); | |
601e68e1 | 1077 | |
c1d10adb PNA |
1078 | if (ctnetlink_dump_tuples(skb, tuple) < 0) |
1079 | goto nfattr_failure; | |
1080 | ||
1081 | NFA_NEST_END(skb, nest_parms); | |
1082 | ||
1083 | return 0; | |
1084 | ||
1085 | nfattr_failure: | |
1086 | return -1; | |
601e68e1 | 1087 | } |
c1d10adb | 1088 | |
1cde6436 PNA |
1089 | static inline int |
1090 | ctnetlink_exp_dump_mask(struct sk_buff *skb, | |
1091 | const struct nf_conntrack_tuple *tuple, | |
1092 | const struct nf_conntrack_tuple *mask) | |
1093 | { | |
1094 | int ret; | |
1095 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 1096 | struct nf_conntrack_l4proto *l4proto; |
1cde6436 PNA |
1097 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK); |
1098 | ||
1099 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); | |
1100 | ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto); | |
1101 | nf_ct_l3proto_put(l3proto); | |
1102 | ||
1103 | if (unlikely(ret < 0)) | |
1104 | goto nfattr_failure; | |
1105 | ||
605dcad6 MJ |
1106 | l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
1107 | ret = ctnetlink_dump_tuples_proto(skb, mask, l4proto); | |
1108 | nf_ct_l4proto_put(l4proto); | |
1cde6436 PNA |
1109 | if (unlikely(ret < 0)) |
1110 | goto nfattr_failure; | |
1111 | ||
1112 | NFA_NEST_END(skb, nest_parms); | |
1113 | ||
1114 | return 0; | |
1115 | ||
1116 | nfattr_failure: | |
1117 | return -1; | |
1118 | } | |
1119 | ||
c1d10adb PNA |
1120 | static inline int |
1121 | ctnetlink_exp_dump_expect(struct sk_buff *skb, | |
601e68e1 | 1122 | const struct nf_conntrack_expect *exp) |
c1d10adb PNA |
1123 | { |
1124 | struct nf_conn *master = exp->master; | |
bff9a89b PM |
1125 | __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ); |
1126 | __be32 id = htonl(exp->id); | |
c1d10adb PNA |
1127 | |
1128 | if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0) | |
1129 | goto nfattr_failure; | |
1cde6436 | 1130 | if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0) |
c1d10adb PNA |
1131 | goto nfattr_failure; |
1132 | if (ctnetlink_exp_dump_tuple(skb, | |
1133 | &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple, | |
1134 | CTA_EXPECT_MASTER) < 0) | |
1135 | goto nfattr_failure; | |
601e68e1 | 1136 | |
c1d10adb PNA |
1137 | NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout); |
1138 | NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id); | |
1139 | ||
1140 | return 0; | |
601e68e1 | 1141 | |
c1d10adb PNA |
1142 | nfattr_failure: |
1143 | return -1; | |
1144 | } | |
1145 | ||
1146 | static int | |
1147 | ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq, | |
601e68e1 YH |
1148 | int event, |
1149 | int nowait, | |
c1d10adb PNA |
1150 | const struct nf_conntrack_expect *exp) |
1151 | { | |
1152 | struct nlmsghdr *nlh; | |
1153 | struct nfgenmsg *nfmsg; | |
27a884dc | 1154 | unsigned char *b = skb_tail_pointer(skb); |
c1d10adb PNA |
1155 | |
1156 | event |= NFNL_SUBSYS_CTNETLINK_EXP << 8; | |
1157 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); | |
1158 | nfmsg = NLMSG_DATA(nlh); | |
1159 | ||
1160 | nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; | |
1161 | nfmsg->nfgen_family = exp->tuple.src.l3num; | |
1162 | nfmsg->version = NFNETLINK_V0; | |
1163 | nfmsg->res_id = 0; | |
1164 | ||
1165 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) | |
1166 | goto nfattr_failure; | |
1167 | ||
27a884dc | 1168 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
c1d10adb PNA |
1169 | return skb->len; |
1170 | ||
1171 | nlmsg_failure: | |
1172 | nfattr_failure: | |
dc5fc579 | 1173 | nlmsg_trim(skb, b); |
c1d10adb PNA |
1174 | return -1; |
1175 | } | |
1176 | ||
1177 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1178 | static int ctnetlink_expect_event(struct notifier_block *this, | |
1179 | unsigned long events, void *ptr) | |
1180 | { | |
1181 | struct nlmsghdr *nlh; | |
1182 | struct nfgenmsg *nfmsg; | |
1183 | struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr; | |
1184 | struct sk_buff *skb; | |
1185 | unsigned int type; | |
27a884dc | 1186 | sk_buff_data_t b; |
c1d10adb PNA |
1187 | int flags = 0; |
1188 | ||
1189 | if (events & IPEXP_NEW) { | |
1190 | type = IPCTNL_MSG_EXP_NEW; | |
1191 | flags = NLM_F_CREATE|NLM_F_EXCL; | |
1192 | } else | |
1193 | return NOTIFY_DONE; | |
1194 | ||
b3a27bfb PNA |
1195 | if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW)) |
1196 | return NOTIFY_DONE; | |
1197 | ||
c1d10adb PNA |
1198 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
1199 | if (!skb) | |
1200 | return NOTIFY_DONE; | |
1201 | ||
1202 | b = skb->tail; | |
1203 | ||
b633ad5f | 1204 | type |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
c1d10adb PNA |
1205 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); |
1206 | nfmsg = NLMSG_DATA(nlh); | |
1207 | ||
1208 | nlh->nlmsg_flags = flags; | |
1209 | nfmsg->nfgen_family = exp->tuple.src.l3num; | |
1210 | nfmsg->version = NFNETLINK_V0; | |
1211 | nfmsg->res_id = 0; | |
1212 | ||
1213 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) | |
1214 | goto nfattr_failure; | |
1215 | ||
1216 | nlh->nlmsg_len = skb->tail - b; | |
1217 | nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0); | |
1218 | return NOTIFY_DONE; | |
1219 | ||
1220 | nlmsg_failure: | |
1221 | nfattr_failure: | |
1222 | kfree_skb(skb); | |
1223 | return NOTIFY_DONE; | |
1224 | } | |
1225 | #endif | |
1226 | ||
1227 | static int | |
1228 | ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb) | |
1229 | { | |
1230 | struct nf_conntrack_expect *exp = NULL; | |
1231 | struct list_head *i; | |
1232 | u_int32_t *id = (u_int32_t *) &cb->args[0]; | |
87711cb8 PNA |
1233 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
1234 | u_int8_t l3proto = nfmsg->nfgen_family; | |
c1d10adb | 1235 | |
c1d10adb PNA |
1236 | read_lock_bh(&nf_conntrack_lock); |
1237 | list_for_each_prev(i, &nf_conntrack_expect_list) { | |
1238 | exp = (struct nf_conntrack_expect *) i; | |
87711cb8 PNA |
1239 | if (l3proto && exp->tuple.src.l3num != l3proto) |
1240 | continue; | |
c1d10adb PNA |
1241 | if (exp->id <= *id) |
1242 | continue; | |
1243 | if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
1244 | cb->nlh->nlmsg_seq, | |
1245 | IPCTNL_MSG_EXP_NEW, | |
1246 | 1, exp) < 0) | |
1247 | goto out; | |
1248 | *id = exp->id; | |
1249 | } | |
601e68e1 | 1250 | out: |
c1d10adb PNA |
1251 | read_unlock_bh(&nf_conntrack_lock); |
1252 | ||
c1d10adb PNA |
1253 | return skb->len; |
1254 | } | |
1255 | ||
1256 | static const size_t cta_min_exp[CTA_EXPECT_MAX] = { | |
1257 | [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t), | |
1258 | [CTA_EXPECT_ID-1] = sizeof(u_int32_t) | |
1259 | }; | |
1260 | ||
1261 | static int | |
601e68e1 | 1262 | ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, |
1d00a4eb | 1263 | struct nlmsghdr *nlh, struct nfattr *cda[]) |
c1d10adb PNA |
1264 | { |
1265 | struct nf_conntrack_tuple tuple; | |
1266 | struct nf_conntrack_expect *exp; | |
1267 | struct sk_buff *skb2; | |
1268 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1269 | u_int8_t u3 = nfmsg->nfgen_family; | |
1270 | int err = 0; | |
1271 | ||
c1d10adb PNA |
1272 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
1273 | return -EINVAL; | |
1274 | ||
1275 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
c702e804 TG |
1276 | return netlink_dump_start(ctnl, skb, nlh, |
1277 | ctnetlink_exp_dump_table, | |
1278 | ctnetlink_done); | |
c1d10adb PNA |
1279 | } |
1280 | ||
1281 | if (cda[CTA_EXPECT_MASTER-1]) | |
1282 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3); | |
1283 | else | |
1284 | return -EINVAL; | |
1285 | ||
1286 | if (err < 0) | |
1287 | return err; | |
1288 | ||
468ec44b | 1289 | exp = nf_conntrack_expect_find_get(&tuple); |
c1d10adb PNA |
1290 | if (!exp) |
1291 | return -ENOENT; | |
1292 | ||
1293 | if (cda[CTA_EXPECT_ID-1]) { | |
bff9a89b | 1294 | __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]); |
c1d10adb PNA |
1295 | if (exp->id != ntohl(id)) { |
1296 | nf_conntrack_expect_put(exp); | |
1297 | return -ENOENT; | |
1298 | } | |
601e68e1 | 1299 | } |
c1d10adb PNA |
1300 | |
1301 | err = -ENOMEM; | |
1302 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1303 | if (!skb2) | |
1304 | goto out; | |
4e9b8269 | 1305 | |
601e68e1 | 1306 | err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid, |
c1d10adb PNA |
1307 | nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, |
1308 | 1, exp); | |
1309 | if (err <= 0) | |
1310 | goto free; | |
1311 | ||
1312 | nf_conntrack_expect_put(exp); | |
1313 | ||
1314 | return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1315 | ||
1316 | free: | |
1317 | kfree_skb(skb2); | |
1318 | out: | |
1319 | nf_conntrack_expect_put(exp); | |
1320 | return err; | |
1321 | } | |
1322 | ||
1323 | static int | |
601e68e1 | 1324 | ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb, |
1d00a4eb | 1325 | struct nlmsghdr *nlh, struct nfattr *cda[]) |
c1d10adb PNA |
1326 | { |
1327 | struct nf_conntrack_expect *exp, *tmp; | |
1328 | struct nf_conntrack_tuple tuple; | |
1329 | struct nf_conntrack_helper *h; | |
1330 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1331 | u_int8_t u3 = nfmsg->nfgen_family; | |
1332 | int err; | |
1333 | ||
1334 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) | |
1335 | return -EINVAL; | |
1336 | ||
1337 | if (cda[CTA_EXPECT_TUPLE-1]) { | |
1338 | /* delete a single expect by tuple */ | |
1339 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); | |
1340 | if (err < 0) | |
1341 | return err; | |
1342 | ||
1343 | /* bump usage count to 2 */ | |
468ec44b | 1344 | exp = nf_conntrack_expect_find_get(&tuple); |
c1d10adb PNA |
1345 | if (!exp) |
1346 | return -ENOENT; | |
1347 | ||
1348 | if (cda[CTA_EXPECT_ID-1]) { | |
bff9a89b | 1349 | __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]); |
c1d10adb PNA |
1350 | if (exp->id != ntohl(id)) { |
1351 | nf_conntrack_expect_put(exp); | |
1352 | return -ENOENT; | |
1353 | } | |
1354 | } | |
1355 | ||
1356 | /* after list removal, usage count == 1 */ | |
1357 | nf_conntrack_unexpect_related(exp); | |
601e68e1 | 1358 | /* have to put what we 'get' above. |
c1d10adb PNA |
1359 | * after this line usage count == 0 */ |
1360 | nf_conntrack_expect_put(exp); | |
1361 | } else if (cda[CTA_EXPECT_HELP_NAME-1]) { | |
1362 | char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]); | |
1363 | ||
1364 | /* delete all expectations for this helper */ | |
1365 | write_lock_bh(&nf_conntrack_lock); | |
1366 | h = __nf_conntrack_helper_find_byname(name); | |
1367 | if (!h) { | |
1368 | write_unlock_bh(&nf_conntrack_lock); | |
1369 | return -EINVAL; | |
1370 | } | |
1371 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, | |
1372 | list) { | |
dc808fe2 HW |
1373 | struct nf_conn_help *m_help = nfct_help(exp->master); |
1374 | if (m_help->helper == h | |
c1d10adb PNA |
1375 | && del_timer(&exp->timeout)) { |
1376 | nf_ct_unlink_expect(exp); | |
1377 | nf_conntrack_expect_put(exp); | |
1378 | } | |
1379 | } | |
1380 | write_unlock_bh(&nf_conntrack_lock); | |
1381 | } else { | |
1382 | /* This basically means we have to flush everything*/ | |
1383 | write_lock_bh(&nf_conntrack_lock); | |
1384 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, | |
1385 | list) { | |
1386 | if (del_timer(&exp->timeout)) { | |
1387 | nf_ct_unlink_expect(exp); | |
1388 | nf_conntrack_expect_put(exp); | |
1389 | } | |
1390 | } | |
1391 | write_unlock_bh(&nf_conntrack_lock); | |
1392 | } | |
1393 | ||
1394 | return 0; | |
1395 | } | |
1396 | static int | |
1397 | ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[]) | |
1398 | { | |
1399 | return -EOPNOTSUPP; | |
1400 | } | |
1401 | ||
1402 | static int | |
1403 | ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3) | |
1404 | { | |
1405 | struct nf_conntrack_tuple tuple, mask, master_tuple; | |
1406 | struct nf_conntrack_tuple_hash *h = NULL; | |
1407 | struct nf_conntrack_expect *exp; | |
1408 | struct nf_conn *ct; | |
dc808fe2 | 1409 | struct nf_conn_help *help; |
c1d10adb PNA |
1410 | int err = 0; |
1411 | ||
c1d10adb PNA |
1412 | /* caller guarantees that those three CTA_EXPECT_* exist */ |
1413 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); | |
1414 | if (err < 0) | |
1415 | return err; | |
1416 | err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3); | |
1417 | if (err < 0) | |
1418 | return err; | |
1419 | err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3); | |
1420 | if (err < 0) | |
1421 | return err; | |
1422 | ||
1423 | /* Look for master conntrack of this expectation */ | |
1424 | h = nf_conntrack_find_get(&master_tuple, NULL); | |
1425 | if (!h) | |
1426 | return -ENOENT; | |
1427 | ct = nf_ct_tuplehash_to_ctrack(h); | |
dc808fe2 | 1428 | help = nfct_help(ct); |
c1d10adb | 1429 | |
dc808fe2 | 1430 | if (!help || !help->helper) { |
c1d10adb PNA |
1431 | /* such conntrack hasn't got any helper, abort */ |
1432 | err = -EINVAL; | |
1433 | goto out; | |
1434 | } | |
1435 | ||
1436 | exp = nf_conntrack_expect_alloc(ct); | |
1437 | if (!exp) { | |
1438 | err = -ENOMEM; | |
1439 | goto out; | |
1440 | } | |
601e68e1 | 1441 | |
c1d10adb PNA |
1442 | exp->expectfn = NULL; |
1443 | exp->flags = 0; | |
1444 | exp->master = ct; | |
9457d851 | 1445 | exp->helper = NULL; |
c1d10adb PNA |
1446 | memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple)); |
1447 | memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple)); | |
1448 | ||
1449 | err = nf_conntrack_expect_related(exp); | |
1450 | nf_conntrack_expect_put(exp); | |
1451 | ||
601e68e1 | 1452 | out: |
c1d10adb PNA |
1453 | nf_ct_put(nf_ct_tuplehash_to_ctrack(h)); |
1454 | return err; | |
1455 | } | |
1456 | ||
1457 | static int | |
1458 | ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb, | |
1d00a4eb | 1459 | struct nlmsghdr *nlh, struct nfattr *cda[]) |
c1d10adb PNA |
1460 | { |
1461 | struct nf_conntrack_tuple tuple; | |
1462 | struct nf_conntrack_expect *exp; | |
1463 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1464 | u_int8_t u3 = nfmsg->nfgen_family; | |
1465 | int err = 0; | |
1466 | ||
c1d10adb PNA |
1467 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
1468 | return -EINVAL; | |
1469 | ||
1470 | if (!cda[CTA_EXPECT_TUPLE-1] | |
1471 | || !cda[CTA_EXPECT_MASK-1] | |
1472 | || !cda[CTA_EXPECT_MASTER-1]) | |
1473 | return -EINVAL; | |
1474 | ||
1475 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); | |
1476 | if (err < 0) | |
1477 | return err; | |
1478 | ||
1479 | write_lock_bh(&nf_conntrack_lock); | |
1480 | exp = __nf_conntrack_expect_find(&tuple); | |
1481 | ||
1482 | if (!exp) { | |
1483 | write_unlock_bh(&nf_conntrack_lock); | |
1484 | err = -ENOENT; | |
1485 | if (nlh->nlmsg_flags & NLM_F_CREATE) | |
1486 | err = ctnetlink_create_expect(cda, u3); | |
1487 | return err; | |
1488 | } | |
1489 | ||
1490 | err = -EEXIST; | |
1491 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) | |
1492 | err = ctnetlink_change_expect(exp, cda); | |
1493 | write_unlock_bh(&nf_conntrack_lock); | |
1494 | ||
c1d10adb PNA |
1495 | return err; |
1496 | } | |
1497 | ||
1498 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1499 | static struct notifier_block ctnl_notifier = { | |
1500 | .notifier_call = ctnetlink_conntrack_event, | |
1501 | }; | |
1502 | ||
1503 | static struct notifier_block ctnl_notifier_exp = { | |
1504 | .notifier_call = ctnetlink_expect_event, | |
1505 | }; | |
1506 | #endif | |
1507 | ||
1508 | static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = { | |
1509 | [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack, | |
1510 | .attr_count = CTA_MAX, }, | |
1511 | [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack, | |
1512 | .attr_count = CTA_MAX, }, | |
1513 | [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack, | |
1514 | .attr_count = CTA_MAX, }, | |
1515 | [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack, | |
1516 | .attr_count = CTA_MAX, }, | |
1517 | }; | |
1518 | ||
1519 | static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = { | |
1520 | [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect, | |
1521 | .attr_count = CTA_EXPECT_MAX, }, | |
1522 | [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect, | |
1523 | .attr_count = CTA_EXPECT_MAX, }, | |
1524 | [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect, | |
1525 | .attr_count = CTA_EXPECT_MAX, }, | |
1526 | }; | |
1527 | ||
1528 | static struct nfnetlink_subsystem ctnl_subsys = { | |
1529 | .name = "conntrack", | |
1530 | .subsys_id = NFNL_SUBSYS_CTNETLINK, | |
1531 | .cb_count = IPCTNL_MSG_MAX, | |
1532 | .cb = ctnl_cb, | |
1533 | }; | |
1534 | ||
1535 | static struct nfnetlink_subsystem ctnl_exp_subsys = { | |
1536 | .name = "conntrack_expect", | |
1537 | .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP, | |
1538 | .cb_count = IPCTNL_MSG_EXP_MAX, | |
1539 | .cb = ctnl_exp_cb, | |
1540 | }; | |
1541 | ||
d2483dde | 1542 | MODULE_ALIAS("ip_conntrack_netlink"); |
c1d10adb | 1543 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK); |
34f9a2e4 | 1544 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP); |
c1d10adb PNA |
1545 | |
1546 | static int __init ctnetlink_init(void) | |
1547 | { | |
1548 | int ret; | |
1549 | ||
1550 | printk("ctnetlink v%s: registering with nfnetlink.\n", version); | |
1551 | ret = nfnetlink_subsys_register(&ctnl_subsys); | |
1552 | if (ret < 0) { | |
1553 | printk("ctnetlink_init: cannot register with nfnetlink.\n"); | |
1554 | goto err_out; | |
1555 | } | |
1556 | ||
1557 | ret = nfnetlink_subsys_register(&ctnl_exp_subsys); | |
1558 | if (ret < 0) { | |
1559 | printk("ctnetlink_init: cannot register exp with nfnetlink.\n"); | |
1560 | goto err_unreg_subsys; | |
1561 | } | |
1562 | ||
1563 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1564 | ret = nf_conntrack_register_notifier(&ctnl_notifier); | |
1565 | if (ret < 0) { | |
1566 | printk("ctnetlink_init: cannot register notifier.\n"); | |
1567 | goto err_unreg_exp_subsys; | |
1568 | } | |
1569 | ||
1570 | ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp); | |
1571 | if (ret < 0) { | |
1572 | printk("ctnetlink_init: cannot expect register notifier.\n"); | |
1573 | goto err_unreg_notifier; | |
1574 | } | |
1575 | #endif | |
1576 | ||
1577 | return 0; | |
1578 | ||
1579 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1580 | err_unreg_notifier: | |
1581 | nf_conntrack_unregister_notifier(&ctnl_notifier); | |
1582 | err_unreg_exp_subsys: | |
1583 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); | |
1584 | #endif | |
1585 | err_unreg_subsys: | |
1586 | nfnetlink_subsys_unregister(&ctnl_subsys); | |
1587 | err_out: | |
1588 | return ret; | |
1589 | } | |
1590 | ||
1591 | static void __exit ctnetlink_exit(void) | |
1592 | { | |
1593 | printk("ctnetlink: unregistering from nfnetlink.\n"); | |
1594 | ||
1595 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
e64a70be | 1596 | nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp); |
c1d10adb PNA |
1597 | nf_conntrack_unregister_notifier(&ctnl_notifier); |
1598 | #endif | |
1599 | ||
1600 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); | |
1601 | nfnetlink_subsys_unregister(&ctnl_subsys); | |
1602 | return; | |
1603 | } | |
1604 | ||
1605 | module_init(ctnetlink_init); | |
1606 | module_exit(ctnetlink_exit); |