Commit | Line | Data |
---|---|---|
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> | |
40a839fd | 32 | #include <linux/interrupt.h> |
c1d10adb PNA |
33 | #include <linux/notifier.h> |
34 | ||
35 | #include <linux/netfilter.h> | |
36 | #include <net/netfilter/nf_conntrack.h> | |
37 | #include <net/netfilter/nf_conntrack_core.h> | |
77ab9cff | 38 | #include <net/netfilter/nf_conntrack_expect.h> |
c1d10adb PNA |
39 | #include <net/netfilter/nf_conntrack_helper.h> |
40 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
605dcad6 | 41 | #include <net/netfilter/nf_conntrack_l4proto.h> |
5b1158e9 JK |
42 | #include <net/netfilter/nf_conntrack_tuple.h> |
43 | #ifdef CONFIG_NF_NAT_NEEDED | |
44 | #include <net/netfilter/nf_nat_core.h> | |
45 | #include <net/netfilter/nf_nat_protocol.h> | |
46 | #endif | |
c1d10adb PNA |
47 | |
48 | #include <linux/netfilter/nfnetlink.h> | |
49 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
50 | ||
51 | MODULE_LICENSE("GPL"); | |
52 | ||
dc808fe2 | 53 | static char __initdata version[] = "0.93"; |
c1d10adb | 54 | |
c1d10adb PNA |
55 | static inline int |
56 | ctnetlink_dump_tuples_proto(struct sk_buff *skb, | |
1cde6436 | 57 | const struct nf_conntrack_tuple *tuple, |
605dcad6 | 58 | struct nf_conntrack_l4proto *l4proto) |
c1d10adb | 59 | { |
c1d10adb | 60 | int ret = 0; |
1cde6436 | 61 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO); |
c1d10adb PNA |
62 | |
63 | NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum); | |
64 | ||
605dcad6 MJ |
65 | if (likely(l4proto->tuple_to_nfattr)) |
66 | ret = l4proto->tuple_to_nfattr(skb, tuple); | |
c1d10adb | 67 | |
1cde6436 | 68 | NFA_NEST_END(skb, nest_parms); |
c1d10adb PNA |
69 | |
70 | return ret; | |
71 | ||
72 | nfattr_failure: | |
73 | return -1; | |
74 | } | |
75 | ||
76 | static inline int | |
1cde6436 PNA |
77 | ctnetlink_dump_tuples_ip(struct sk_buff *skb, |
78 | const struct nf_conntrack_tuple *tuple, | |
79 | struct nf_conntrack_l3proto *l3proto) | |
c1d10adb | 80 | { |
c1d10adb | 81 | int ret = 0; |
1cde6436 PNA |
82 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP); |
83 | ||
c1d10adb PNA |
84 | if (likely(l3proto->tuple_to_nfattr)) |
85 | ret = l3proto->tuple_to_nfattr(skb, tuple); | |
1cde6436 | 86 | |
c1d10adb PNA |
87 | NFA_NEST_END(skb, nest_parms); |
88 | ||
1cde6436 PNA |
89 | return ret; |
90 | ||
91 | nfattr_failure: | |
92 | return -1; | |
93 | } | |
94 | ||
95 | static inline int | |
96 | ctnetlink_dump_tuples(struct sk_buff *skb, | |
97 | const struct nf_conntrack_tuple *tuple) | |
98 | { | |
99 | int ret; | |
100 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 101 | struct nf_conntrack_l4proto *l4proto; |
1cde6436 PNA |
102 | |
103 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); | |
104 | ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto); | |
c1d10adb PNA |
105 | nf_ct_l3proto_put(l3proto); |
106 | ||
107 | if (unlikely(ret < 0)) | |
108 | return ret; | |
109 | ||
605dcad6 MJ |
110 | l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
111 | ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto); | |
112 | nf_ct_l4proto_put(l4proto); | |
c1d10adb PNA |
113 | |
114 | return ret; | |
c1d10adb PNA |
115 | } |
116 | ||
117 | static inline int | |
118 | ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct) | |
119 | { | |
bff9a89b | 120 | __be32 status = htonl((u_int32_t) ct->status); |
c1d10adb PNA |
121 | NFA_PUT(skb, CTA_STATUS, sizeof(status), &status); |
122 | return 0; | |
123 | ||
124 | nfattr_failure: | |
125 | return -1; | |
126 | } | |
127 | ||
128 | static inline int | |
129 | ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct) | |
130 | { | |
131 | long timeout_l = ct->timeout.expires - jiffies; | |
bff9a89b | 132 | __be32 timeout; |
c1d10adb PNA |
133 | |
134 | if (timeout_l < 0) | |
135 | timeout = 0; | |
136 | else | |
137 | timeout = htonl(timeout_l / HZ); | |
138 | ||
139 | NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout); | |
140 | return 0; | |
141 | ||
142 | nfattr_failure: | |
143 | return -1; | |
144 | } | |
145 | ||
146 | static inline int | |
147 | ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct) | |
148 | { | |
605dcad6 | 149 | 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 |
150 | struct nfattr *nest_proto; |
151 | int ret; | |
152 | ||
605dcad6 MJ |
153 | if (!l4proto->to_nfattr) { |
154 | nf_ct_l4proto_put(l4proto); | |
c1d10adb PNA |
155 | return 0; |
156 | } | |
157 | ||
158 | nest_proto = NFA_NEST(skb, CTA_PROTOINFO); | |
159 | ||
605dcad6 | 160 | ret = l4proto->to_nfattr(skb, nest_proto, ct); |
c1d10adb | 161 | |
605dcad6 | 162 | nf_ct_l4proto_put(l4proto); |
c1d10adb PNA |
163 | |
164 | NFA_NEST_END(skb, nest_proto); | |
165 | ||
166 | return ret; | |
167 | ||
168 | nfattr_failure: | |
605dcad6 | 169 | nf_ct_l4proto_put(l4proto); |
c1d10adb PNA |
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); | |
bff9a89b | 203 | __be32 tmp; |
c1d10adb PNA |
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 | { | |
bff9a89b | 226 | __be32 mark = htonl(ct->mark); |
c1d10adb PNA |
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 | { | |
bff9a89b | 241 | __be32 id = htonl(ct->id); |
c1d10adb PNA |
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 | { | |
bff9a89b | 252 | __be32 use = htonl(atomic_read(&ct->ct_general.use)); |
c1d10adb PNA |
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; | |
c1d10adb | 338 | group = NFNLGRP_CONNTRACK_NEW; |
1a31526b | 339 | } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) { |
c1d10adb PNA |
340 | type = IPCTNL_MSG_CT_NEW; |
341 | group = NFNLGRP_CONNTRACK_UPDATE; | |
342 | } else | |
343 | return NOTIFY_DONE; | |
a2427692 PM |
344 | |
345 | if (!nfnetlink_has_listeners(group)) | |
346 | return NOTIFY_DONE; | |
347 | ||
c1d10adb PNA |
348 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
349 | if (!skb) | |
350 | return NOTIFY_DONE; | |
351 | ||
352 | b = skb->tail; | |
353 | ||
354 | type |= NFNL_SUBSYS_CTNETLINK << 8; | |
355 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); | |
356 | nfmsg = NLMSG_DATA(nlh); | |
357 | ||
358 | nlh->nlmsg_flags = flags; | |
359 | nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
360 | nfmsg->version = NFNETLINK_V0; | |
361 | nfmsg->res_id = 0; | |
362 | ||
363 | nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG); | |
364 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) | |
365 | goto nfattr_failure; | |
366 | NFA_NEST_END(skb, nest_parms); | |
367 | ||
368 | nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY); | |
369 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) | |
370 | goto nfattr_failure; | |
371 | NFA_NEST_END(skb, nest_parms); | |
c1d10adb | 372 | |
7b621c1e PNA |
373 | if (events & IPCT_DESTROY) { |
374 | if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || | |
375 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0) | |
376 | goto nfattr_failure; | |
377 | } else { | |
378 | if (ctnetlink_dump_status(skb, ct) < 0) | |
379 | goto nfattr_failure; | |
380 | ||
381 | if (ctnetlink_dump_timeout(skb, ct) < 0) | |
382 | goto nfattr_failure; | |
383 | ||
384 | if (events & IPCT_PROTOINFO | |
385 | && ctnetlink_dump_protoinfo(skb, ct) < 0) | |
386 | goto nfattr_failure; | |
387 | ||
388 | if ((events & IPCT_HELPER || nfct_help(ct)) | |
389 | && ctnetlink_dump_helpinfo(skb, ct) < 0) | |
390 | goto nfattr_failure; | |
391 | ||
392 | if ((events & IPCT_MARK || ct->mark) | |
393 | && ctnetlink_dump_mark(skb, ct) < 0) | |
394 | goto nfattr_failure; | |
395 | ||
396 | if (events & IPCT_COUNTER_FILLING && | |
397 | (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || | |
398 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)) | |
399 | goto nfattr_failure; | |
400 | } | |
b9a37e0c | 401 | |
c1d10adb PNA |
402 | nlh->nlmsg_len = skb->tail - b; |
403 | nfnetlink_send(skb, 0, group, 0); | |
404 | return NOTIFY_DONE; | |
405 | ||
406 | nlmsg_failure: | |
407 | nfattr_failure: | |
408 | kfree_skb(skb); | |
409 | return NOTIFY_DONE; | |
410 | } | |
411 | #endif /* CONFIG_NF_CONNTRACK_EVENTS */ | |
412 | ||
413 | static int ctnetlink_done(struct netlink_callback *cb) | |
414 | { | |
89f2e218 PM |
415 | if (cb->args[1]) |
416 | nf_ct_put((struct nf_conn *)cb->args[1]); | |
c1d10adb PNA |
417 | return 0; |
418 | } | |
419 | ||
87711cb8 PNA |
420 | #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num |
421 | ||
c1d10adb PNA |
422 | static int |
423 | ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb) | |
424 | { | |
89f2e218 | 425 | struct nf_conn *ct, *last; |
c1d10adb PNA |
426 | struct nf_conntrack_tuple_hash *h; |
427 | struct list_head *i; | |
87711cb8 PNA |
428 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
429 | u_int8_t l3proto = nfmsg->nfgen_family; | |
c1d10adb | 430 | |
c1d10adb | 431 | read_lock_bh(&nf_conntrack_lock); |
d205dc40 | 432 | last = (struct nf_conn *)cb->args[1]; |
89f2e218 PM |
433 | for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) { |
434 | restart: | |
c1d10adb PNA |
435 | list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) { |
436 | h = (struct nf_conntrack_tuple_hash *) i; | |
5b1158e9 | 437 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
c1d10adb PNA |
438 | continue; |
439 | ct = nf_ct_tuplehash_to_ctrack(h); | |
87711cb8 PNA |
440 | /* Dump entries of a given L3 protocol number. |
441 | * If it is not specified, ie. l3proto == 0, | |
442 | * then dump everything. */ | |
443 | if (l3proto && L3PROTO(ct) != l3proto) | |
444 | continue; | |
d205dc40 PM |
445 | if (cb->args[1]) { |
446 | if (ct != last) | |
89f2e218 | 447 | continue; |
d205dc40 | 448 | cb->args[1] = 0; |
89f2e218 | 449 | } |
c1d10adb PNA |
450 | if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid, |
451 | cb->nlh->nlmsg_seq, | |
452 | IPCTNL_MSG_CT_NEW, | |
89f2e218 PM |
453 | 1, ct) < 0) { |
454 | nf_conntrack_get(&ct->ct_general); | |
455 | cb->args[1] = (unsigned long)ct; | |
c1d10adb | 456 | goto out; |
89f2e218 | 457 | } |
01f34848 PNA |
458 | #ifdef CONFIG_NF_CT_ACCT |
459 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == | |
460 | IPCTNL_MSG_CT_GET_CTRZERO) | |
461 | memset(&ct->counters, 0, sizeof(ct->counters)); | |
462 | #endif | |
89f2e218 | 463 | } |
d205dc40 | 464 | if (cb->args[1]) { |
89f2e218 PM |
465 | cb->args[1] = 0; |
466 | goto restart; | |
c1d10adb PNA |
467 | } |
468 | } | |
89f2e218 | 469 | out: |
c1d10adb | 470 | read_unlock_bh(&nf_conntrack_lock); |
d205dc40 PM |
471 | if (last) |
472 | nf_ct_put(last); | |
c1d10adb | 473 | |
c1d10adb PNA |
474 | return skb->len; |
475 | } | |
476 | ||
c1d10adb PNA |
477 | static inline int |
478 | ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple) | |
479 | { | |
480 | struct nfattr *tb[CTA_IP_MAX]; | |
481 | struct nf_conntrack_l3proto *l3proto; | |
482 | int ret = 0; | |
483 | ||
c1d10adb PNA |
484 | nfattr_parse_nested(tb, CTA_IP_MAX, attr); |
485 | ||
486 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); | |
487 | ||
488 | if (likely(l3proto->nfattr_to_tuple)) | |
489 | ret = l3proto->nfattr_to_tuple(tb, tuple); | |
490 | ||
491 | nf_ct_l3proto_put(l3proto); | |
492 | ||
c1d10adb PNA |
493 | return ret; |
494 | } | |
495 | ||
496 | static const size_t cta_min_proto[CTA_PROTO_MAX] = { | |
497 | [CTA_PROTO_NUM-1] = sizeof(u_int8_t), | |
498 | }; | |
499 | ||
500 | static inline int | |
501 | ctnetlink_parse_tuple_proto(struct nfattr *attr, | |
502 | struct nf_conntrack_tuple *tuple) | |
503 | { | |
504 | struct nfattr *tb[CTA_PROTO_MAX]; | |
605dcad6 | 505 | struct nf_conntrack_l4proto *l4proto; |
c1d10adb PNA |
506 | int ret = 0; |
507 | ||
c1d10adb PNA |
508 | nfattr_parse_nested(tb, CTA_PROTO_MAX, attr); |
509 | ||
510 | if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto)) | |
511 | return -EINVAL; | |
512 | ||
513 | if (!tb[CTA_PROTO_NUM-1]) | |
514 | return -EINVAL; | |
515 | tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]); | |
516 | ||
605dcad6 | 517 | l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
c1d10adb | 518 | |
605dcad6 MJ |
519 | if (likely(l4proto->nfattr_to_tuple)) |
520 | ret = l4proto->nfattr_to_tuple(tb, tuple); | |
c1d10adb | 521 | |
605dcad6 | 522 | nf_ct_l4proto_put(l4proto); |
c1d10adb PNA |
523 | |
524 | return ret; | |
525 | } | |
526 | ||
527 | static inline int | |
528 | ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple, | |
529 | enum ctattr_tuple type, u_int8_t l3num) | |
530 | { | |
531 | struct nfattr *tb[CTA_TUPLE_MAX]; | |
532 | int err; | |
533 | ||
c1d10adb PNA |
534 | memset(tuple, 0, sizeof(*tuple)); |
535 | ||
536 | nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]); | |
537 | ||
538 | if (!tb[CTA_TUPLE_IP-1]) | |
539 | return -EINVAL; | |
540 | ||
541 | tuple->src.l3num = l3num; | |
542 | ||
543 | err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple); | |
544 | if (err < 0) | |
545 | return err; | |
546 | ||
547 | if (!tb[CTA_TUPLE_PROTO-1]) | |
548 | return -EINVAL; | |
549 | ||
550 | err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple); | |
551 | if (err < 0) | |
552 | return err; | |
553 | ||
554 | /* orig and expect tuples get DIR_ORIGINAL */ | |
555 | if (type == CTA_TUPLE_REPLY) | |
556 | tuple->dst.dir = IP_CT_DIR_REPLY; | |
557 | else | |
558 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; | |
559 | ||
c1d10adb PNA |
560 | return 0; |
561 | } | |
562 | ||
5b1158e9 | 563 | #ifdef CONFIG_NF_NAT_NEEDED |
c1d10adb PNA |
564 | static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = { |
565 | [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t), | |
566 | [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t), | |
567 | }; | |
568 | ||
5b1158e9 | 569 | static int nfnetlink_parse_nat_proto(struct nfattr *attr, |
c1d10adb | 570 | const struct nf_conn *ct, |
5b1158e9 | 571 | struct nf_nat_range *range) |
c1d10adb PNA |
572 | { |
573 | struct nfattr *tb[CTA_PROTONAT_MAX]; | |
5b1158e9 | 574 | struct nf_nat_protocol *npt; |
c1d10adb | 575 | |
c1d10adb PNA |
576 | nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr); |
577 | ||
578 | if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat)) | |
579 | return -EINVAL; | |
580 | ||
5b1158e9 | 581 | npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum); |
c1d10adb PNA |
582 | |
583 | if (!npt->nfattr_to_range) { | |
5b1158e9 | 584 | nf_nat_proto_put(npt); |
c1d10adb PNA |
585 | return 0; |
586 | } | |
587 | ||
588 | /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */ | |
589 | if (npt->nfattr_to_range(tb, range) > 0) | |
590 | range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED; | |
591 | ||
5b1158e9 | 592 | nf_nat_proto_put(npt); |
c1d10adb | 593 | |
c1d10adb PNA |
594 | return 0; |
595 | } | |
596 | ||
597 | static const size_t cta_min_nat[CTA_NAT_MAX] = { | |
598 | [CTA_NAT_MINIP-1] = sizeof(u_int32_t), | |
599 | [CTA_NAT_MAXIP-1] = sizeof(u_int32_t), | |
600 | }; | |
601 | ||
602 | static inline int | |
5b1158e9 JK |
603 | nfnetlink_parse_nat(struct nfattr *nat, |
604 | const struct nf_conn *ct, struct nf_nat_range *range) | |
c1d10adb PNA |
605 | { |
606 | struct nfattr *tb[CTA_NAT_MAX]; | |
607 | int err; | |
608 | ||
c1d10adb PNA |
609 | memset(range, 0, sizeof(*range)); |
610 | ||
3726add7 | 611 | nfattr_parse_nested(tb, CTA_NAT_MAX, nat); |
c1d10adb PNA |
612 | |
613 | if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat)) | |
614 | return -EINVAL; | |
615 | ||
616 | if (tb[CTA_NAT_MINIP-1]) | |
bff9a89b | 617 | range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]); |
c1d10adb PNA |
618 | |
619 | if (!tb[CTA_NAT_MAXIP-1]) | |
620 | range->max_ip = range->min_ip; | |
621 | else | |
bff9a89b | 622 | range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]); |
c1d10adb PNA |
623 | |
624 | if (range->min_ip) | |
625 | range->flags |= IP_NAT_RANGE_MAP_IPS; | |
626 | ||
627 | if (!tb[CTA_NAT_PROTO-1]) | |
628 | return 0; | |
629 | ||
5b1158e9 | 630 | err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range); |
c1d10adb PNA |
631 | if (err < 0) |
632 | return err; | |
633 | ||
c1d10adb PNA |
634 | return 0; |
635 | } | |
636 | #endif | |
637 | ||
638 | static inline int | |
639 | ctnetlink_parse_help(struct nfattr *attr, char **helper_name) | |
640 | { | |
641 | struct nfattr *tb[CTA_HELP_MAX]; | |
642 | ||
c1d10adb PNA |
643 | nfattr_parse_nested(tb, CTA_HELP_MAX, attr); |
644 | ||
645 | if (!tb[CTA_HELP_NAME-1]) | |
646 | return -EINVAL; | |
647 | ||
648 | *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]); | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
653 | static const size_t cta_min[CTA_MAX] = { | |
654 | [CTA_STATUS-1] = sizeof(u_int32_t), | |
655 | [CTA_TIMEOUT-1] = sizeof(u_int32_t), | |
656 | [CTA_MARK-1] = sizeof(u_int32_t), | |
657 | [CTA_USE-1] = sizeof(u_int32_t), | |
658 | [CTA_ID-1] = sizeof(u_int32_t) | |
659 | }; | |
660 | ||
661 | static int | |
662 | ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, | |
663 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
664 | { | |
665 | struct nf_conntrack_tuple_hash *h; | |
666 | struct nf_conntrack_tuple tuple; | |
667 | struct nf_conn *ct; | |
668 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
669 | u_int8_t u3 = nfmsg->nfgen_family; | |
670 | int err = 0; | |
671 | ||
c1d10adb PNA |
672 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
673 | return -EINVAL; | |
674 | ||
675 | if (cda[CTA_TUPLE_ORIG-1]) | |
676 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); | |
677 | else if (cda[CTA_TUPLE_REPLY-1]) | |
678 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); | |
679 | else { | |
680 | /* Flush the whole table */ | |
681 | nf_conntrack_flush(); | |
682 | return 0; | |
683 | } | |
684 | ||
685 | if (err < 0) | |
686 | return err; | |
687 | ||
688 | h = nf_conntrack_find_get(&tuple, NULL); | |
9ea8cfd6 | 689 | if (!h) |
c1d10adb | 690 | return -ENOENT; |
c1d10adb PNA |
691 | |
692 | ct = nf_ct_tuplehash_to_ctrack(h); | |
693 | ||
694 | if (cda[CTA_ID-1]) { | |
bff9a89b | 695 | u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1])); |
c1d10adb PNA |
696 | if (ct->id != id) { |
697 | nf_ct_put(ct); | |
698 | return -ENOENT; | |
699 | } | |
700 | } | |
701 | if (del_timer(&ct->timeout)) | |
702 | ct->timeout.function((unsigned long)ct); | |
703 | ||
704 | nf_ct_put(ct); | |
c1d10adb PNA |
705 | |
706 | return 0; | |
707 | } | |
708 | ||
709 | static int | |
710 | ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, | |
711 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
712 | { | |
713 | struct nf_conntrack_tuple_hash *h; | |
714 | struct nf_conntrack_tuple tuple; | |
715 | struct nf_conn *ct; | |
716 | struct sk_buff *skb2 = NULL; | |
717 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
718 | u_int8_t u3 = nfmsg->nfgen_family; | |
719 | int err = 0; | |
720 | ||
c1d10adb PNA |
721 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
722 | u32 rlen; | |
723 | ||
01f34848 PNA |
724 | #ifndef CONFIG_NF_CT_ACCT |
725 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO) | |
c1d10adb PNA |
726 | return -ENOTSUPP; |
727 | #endif | |
01f34848 PNA |
728 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, |
729 | ctnetlink_dump_table, | |
730 | ctnetlink_done)) != 0) | |
c1d10adb | 731 | return -EINVAL; |
c1d10adb PNA |
732 | |
733 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
734 | if (rlen > skb->len) | |
735 | rlen = skb->len; | |
736 | skb_pull(skb, rlen); | |
737 | return 0; | |
738 | } | |
739 | ||
740 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) | |
741 | return -EINVAL; | |
742 | ||
743 | if (cda[CTA_TUPLE_ORIG-1]) | |
744 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); | |
745 | else if (cda[CTA_TUPLE_REPLY-1]) | |
746 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); | |
747 | else | |
748 | return -EINVAL; | |
749 | ||
750 | if (err < 0) | |
751 | return err; | |
752 | ||
753 | h = nf_conntrack_find_get(&tuple, NULL); | |
9ea8cfd6 | 754 | if (!h) |
c1d10adb | 755 | return -ENOENT; |
9ea8cfd6 | 756 | |
c1d10adb PNA |
757 | ct = nf_ct_tuplehash_to_ctrack(h); |
758 | ||
759 | err = -ENOMEM; | |
760 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
761 | if (!skb2) { | |
762 | nf_ct_put(ct); | |
763 | return -ENOMEM; | |
764 | } | |
c1d10adb PNA |
765 | |
766 | err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, | |
767 | IPCTNL_MSG_CT_NEW, 1, ct); | |
768 | nf_ct_put(ct); | |
769 | if (err <= 0) | |
770 | goto free; | |
771 | ||
772 | err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
773 | if (err < 0) | |
774 | goto out; | |
775 | ||
c1d10adb PNA |
776 | return 0; |
777 | ||
778 | free: | |
779 | kfree_skb(skb2); | |
780 | out: | |
781 | return err; | |
782 | } | |
783 | ||
784 | static inline int | |
785 | ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[]) | |
786 | { | |
787 | unsigned long d; | |
bff9a89b | 788 | unsigned int status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1])); |
c1d10adb PNA |
789 | d = ct->status ^ status; |
790 | ||
791 | if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING)) | |
792 | /* unchangeable */ | |
793 | return -EINVAL; | |
794 | ||
795 | if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY)) | |
796 | /* SEEN_REPLY bit can only be set */ | |
797 | return -EINVAL; | |
798 | ||
799 | ||
800 | if (d & IPS_ASSURED && !(status & IPS_ASSURED)) | |
801 | /* ASSURED bit can only be set */ | |
802 | return -EINVAL; | |
803 | ||
3726add7 | 804 | if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { |
5b1158e9 | 805 | #ifndef CONFIG_NF_NAT_NEEDED |
c1d10adb PNA |
806 | return -EINVAL; |
807 | #else | |
5b1158e9 | 808 | struct nf_nat_range range; |
c1d10adb | 809 | |
3726add7 | 810 | if (cda[CTA_NAT_DST-1]) { |
5b1158e9 | 811 | if (nfnetlink_parse_nat(cda[CTA_NAT_DST-1], ct, |
3726add7 PM |
812 | &range) < 0) |
813 | return -EINVAL; | |
5b1158e9 | 814 | if (nf_nat_initialized(ct, |
3726add7 PM |
815 | HOOK2MANIP(NF_IP_PRE_ROUTING))) |
816 | return -EEXIST; | |
5b1158e9 | 817 | nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING); |
3726add7 PM |
818 | } |
819 | if (cda[CTA_NAT_SRC-1]) { | |
5b1158e9 | 820 | if (nfnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct, |
3726add7 PM |
821 | &range) < 0) |
822 | return -EINVAL; | |
5b1158e9 | 823 | if (nf_nat_initialized(ct, |
3726add7 PM |
824 | HOOK2MANIP(NF_IP_POST_ROUTING))) |
825 | return -EEXIST; | |
5b1158e9 | 826 | nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING); |
3726add7 | 827 | } |
c1d10adb PNA |
828 | #endif |
829 | } | |
830 | ||
831 | /* Be careful here, modifying NAT bits can screw up things, | |
832 | * so don't let users modify them directly if they don't pass | |
5b1158e9 | 833 | * nf_nat_range. */ |
c1d10adb PNA |
834 | ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK); |
835 | return 0; | |
836 | } | |
837 | ||
838 | ||
839 | static inline int | |
840 | ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[]) | |
841 | { | |
842 | struct nf_conntrack_helper *helper; | |
dc808fe2 | 843 | struct nf_conn_help *help = nfct_help(ct); |
c1d10adb PNA |
844 | char *helpname; |
845 | int err; | |
846 | ||
dc808fe2 HW |
847 | if (!help) { |
848 | /* FIXME: we need to reallocate and rehash */ | |
849 | return -EBUSY; | |
850 | } | |
851 | ||
c1d10adb PNA |
852 | /* don't change helper of sibling connections */ |
853 | if (ct->master) | |
854 | return -EINVAL; | |
855 | ||
856 | err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname); | |
857 | if (err < 0) | |
858 | return err; | |
859 | ||
860 | helper = __nf_conntrack_helper_find_byname(helpname); | |
861 | if (!helper) { | |
862 | if (!strcmp(helpname, "")) | |
863 | helper = NULL; | |
864 | else | |
865 | return -EINVAL; | |
866 | } | |
867 | ||
dc808fe2 | 868 | if (help->helper) { |
c1d10adb PNA |
869 | if (!helper) { |
870 | /* we had a helper before ... */ | |
871 | nf_ct_remove_expectations(ct); | |
dc808fe2 | 872 | help->helper = NULL; |
c1d10adb PNA |
873 | } else { |
874 | /* need to zero data of old helper */ | |
dc808fe2 | 875 | memset(&help->help, 0, sizeof(help->help)); |
c1d10adb PNA |
876 | } |
877 | } | |
878 | ||
dc808fe2 | 879 | help->helper = helper; |
c1d10adb PNA |
880 | |
881 | return 0; | |
882 | } | |
883 | ||
884 | static inline int | |
885 | ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[]) | |
886 | { | |
bff9a89b | 887 | u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1])); |
c1d10adb PNA |
888 | |
889 | if (!del_timer(&ct->timeout)) | |
890 | return -ETIME; | |
891 | ||
892 | ct->timeout.expires = jiffies + timeout * HZ; | |
893 | add_timer(&ct->timeout); | |
894 | ||
895 | return 0; | |
896 | } | |
897 | ||
898 | static inline int | |
899 | ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[]) | |
900 | { | |
901 | struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1]; | |
605dcad6 | 902 | struct nf_conntrack_l4proto *l4proto; |
c1d10adb PNA |
903 | u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum; |
904 | u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
905 | int err = 0; | |
906 | ||
907 | nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr); | |
908 | ||
605dcad6 | 909 | l4proto = nf_ct_l4proto_find_get(l3num, npt); |
c1d10adb | 910 | |
605dcad6 MJ |
911 | if (l4proto->from_nfattr) |
912 | err = l4proto->from_nfattr(tb, ct); | |
913 | nf_ct_l4proto_put(l4proto); | |
c1d10adb PNA |
914 | |
915 | return err; | |
916 | } | |
917 | ||
918 | static int | |
919 | ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[]) | |
920 | { | |
921 | int err; | |
922 | ||
c1d10adb PNA |
923 | if (cda[CTA_HELP-1]) { |
924 | err = ctnetlink_change_helper(ct, cda); | |
925 | if (err < 0) | |
926 | return err; | |
927 | } | |
928 | ||
929 | if (cda[CTA_TIMEOUT-1]) { | |
930 | err = ctnetlink_change_timeout(ct, cda); | |
931 | if (err < 0) | |
932 | return err; | |
933 | } | |
934 | ||
935 | if (cda[CTA_STATUS-1]) { | |
936 | err = ctnetlink_change_status(ct, cda); | |
937 | if (err < 0) | |
938 | return err; | |
939 | } | |
940 | ||
941 | if (cda[CTA_PROTOINFO-1]) { | |
942 | err = ctnetlink_change_protoinfo(ct, cda); | |
943 | if (err < 0) | |
944 | return err; | |
945 | } | |
946 | ||
bcd1e830 | 947 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
c1d10adb | 948 | if (cda[CTA_MARK-1]) |
bff9a89b | 949 | ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1])); |
c1d10adb PNA |
950 | #endif |
951 | ||
c1d10adb PNA |
952 | return 0; |
953 | } | |
954 | ||
955 | static int | |
956 | ctnetlink_create_conntrack(struct nfattr *cda[], | |
957 | struct nf_conntrack_tuple *otuple, | |
958 | struct nf_conntrack_tuple *rtuple) | |
959 | { | |
960 | struct nf_conn *ct; | |
961 | int err = -EINVAL; | |
dafc741c | 962 | struct nf_conn_help *help; |
c1d10adb | 963 | |
c1d10adb PNA |
964 | ct = nf_conntrack_alloc(otuple, rtuple); |
965 | if (ct == NULL || IS_ERR(ct)) | |
966 | return -ENOMEM; | |
967 | ||
968 | if (!cda[CTA_TIMEOUT-1]) | |
969 | goto err; | |
bff9a89b | 970 | ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1])); |
c1d10adb PNA |
971 | |
972 | ct->timeout.expires = jiffies + ct->timeout.expires * HZ; | |
973 | ct->status |= IPS_CONFIRMED; | |
974 | ||
bbb3357d PNA |
975 | if (cda[CTA_STATUS-1]) { |
976 | err = ctnetlink_change_status(ct, cda); | |
977 | if (err < 0) | |
978 | goto err; | |
979 | } | |
c1d10adb PNA |
980 | |
981 | if (cda[CTA_PROTOINFO-1]) { | |
982 | err = ctnetlink_change_protoinfo(ct, cda); | |
983 | if (err < 0) | |
984 | return err; | |
985 | } | |
986 | ||
bcd1e830 | 987 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
c1d10adb | 988 | if (cda[CTA_MARK-1]) |
bff9a89b | 989 | ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1])); |
c1d10adb PNA |
990 | #endif |
991 | ||
dafc741c YK |
992 | help = nfct_help(ct); |
993 | if (help) | |
994 | help->helper = nf_ct_helper_find_get(rtuple); | |
995 | ||
c1d10adb PNA |
996 | add_timer(&ct->timeout); |
997 | nf_conntrack_hash_insert(ct); | |
998 | ||
dafc741c YK |
999 | if (help && help->helper) |
1000 | nf_ct_helper_put(help->helper); | |
1001 | ||
c1d10adb PNA |
1002 | return 0; |
1003 | ||
1004 | err: | |
1005 | nf_conntrack_free(ct); | |
1006 | return err; | |
1007 | } | |
1008 | ||
1009 | static int | |
1010 | ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, | |
1011 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
1012 | { | |
1013 | struct nf_conntrack_tuple otuple, rtuple; | |
1014 | struct nf_conntrack_tuple_hash *h = NULL; | |
1015 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1016 | u_int8_t u3 = nfmsg->nfgen_family; | |
1017 | int err = 0; | |
1018 | ||
c1d10adb PNA |
1019 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
1020 | return -EINVAL; | |
1021 | ||
1022 | if (cda[CTA_TUPLE_ORIG-1]) { | |
1023 | err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3); | |
1024 | if (err < 0) | |
1025 | return err; | |
1026 | } | |
1027 | ||
1028 | if (cda[CTA_TUPLE_REPLY-1]) { | |
1029 | err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3); | |
1030 | if (err < 0) | |
1031 | return err; | |
1032 | } | |
1033 | ||
1034 | write_lock_bh(&nf_conntrack_lock); | |
1035 | if (cda[CTA_TUPLE_ORIG-1]) | |
1036 | h = __nf_conntrack_find(&otuple, NULL); | |
1037 | else if (cda[CTA_TUPLE_REPLY-1]) | |
1038 | h = __nf_conntrack_find(&rtuple, NULL); | |
1039 | ||
1040 | if (h == NULL) { | |
1041 | write_unlock_bh(&nf_conntrack_lock); | |
c1d10adb PNA |
1042 | err = -ENOENT; |
1043 | if (nlh->nlmsg_flags & NLM_F_CREATE) | |
1044 | err = ctnetlink_create_conntrack(cda, &otuple, &rtuple); | |
1045 | return err; | |
1046 | } | |
1047 | /* implicit 'else' */ | |
1048 | ||
1049 | /* we only allow nat config for new conntracks */ | |
3726add7 | 1050 | if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { |
c1d10adb PNA |
1051 | err = -EINVAL; |
1052 | goto out_unlock; | |
1053 | } | |
1054 | ||
1055 | /* We manipulate the conntrack inside the global conntrack table lock, | |
1056 | * so there's no need to increase the refcount */ | |
c1d10adb PNA |
1057 | err = -EEXIST; |
1058 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) | |
1059 | err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda); | |
1060 | ||
1061 | out_unlock: | |
1062 | write_unlock_bh(&nf_conntrack_lock); | |
1063 | return err; | |
1064 | } | |
1065 | ||
1066 | /*********************************************************************** | |
1067 | * EXPECT | |
1068 | ***********************************************************************/ | |
1069 | ||
1070 | static inline int | |
1071 | ctnetlink_exp_dump_tuple(struct sk_buff *skb, | |
1072 | const struct nf_conntrack_tuple *tuple, | |
1073 | enum ctattr_expect type) | |
1074 | { | |
1075 | struct nfattr *nest_parms = NFA_NEST(skb, type); | |
1076 | ||
1077 | if (ctnetlink_dump_tuples(skb, tuple) < 0) | |
1078 | goto nfattr_failure; | |
1079 | ||
1080 | NFA_NEST_END(skb, nest_parms); | |
1081 | ||
1082 | return 0; | |
1083 | ||
1084 | nfattr_failure: | |
1085 | return -1; | |
1086 | } | |
1087 | ||
1cde6436 PNA |
1088 | static inline int |
1089 | ctnetlink_exp_dump_mask(struct sk_buff *skb, | |
1090 | const struct nf_conntrack_tuple *tuple, | |
1091 | const struct nf_conntrack_tuple *mask) | |
1092 | { | |
1093 | int ret; | |
1094 | struct nf_conntrack_l3proto *l3proto; | |
605dcad6 | 1095 | struct nf_conntrack_l4proto *l4proto; |
1cde6436 PNA |
1096 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK); |
1097 | ||
1098 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); | |
1099 | ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto); | |
1100 | nf_ct_l3proto_put(l3proto); | |
1101 | ||
1102 | if (unlikely(ret < 0)) | |
1103 | goto nfattr_failure; | |
1104 | ||
605dcad6 MJ |
1105 | l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
1106 | ret = ctnetlink_dump_tuples_proto(skb, mask, l4proto); | |
1107 | nf_ct_l4proto_put(l4proto); | |
1cde6436 PNA |
1108 | if (unlikely(ret < 0)) |
1109 | goto nfattr_failure; | |
1110 | ||
1111 | NFA_NEST_END(skb, nest_parms); | |
1112 | ||
1113 | return 0; | |
1114 | ||
1115 | nfattr_failure: | |
1116 | return -1; | |
1117 | } | |
1118 | ||
c1d10adb PNA |
1119 | static inline int |
1120 | ctnetlink_exp_dump_expect(struct sk_buff *skb, | |
1121 | const struct nf_conntrack_expect *exp) | |
1122 | { | |
1123 | struct nf_conn *master = exp->master; | |
bff9a89b PM |
1124 | __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ); |
1125 | __be32 id = htonl(exp->id); | |
c1d10adb PNA |
1126 | |
1127 | if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0) | |
1128 | goto nfattr_failure; | |
1cde6436 | 1129 | if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0) |
c1d10adb PNA |
1130 | goto nfattr_failure; |
1131 | if (ctnetlink_exp_dump_tuple(skb, | |
1132 | &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple, | |
1133 | CTA_EXPECT_MASTER) < 0) | |
1134 | goto nfattr_failure; | |
1135 | ||
1136 | NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout); | |
1137 | NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id); | |
1138 | ||
1139 | return 0; | |
1140 | ||
1141 | nfattr_failure: | |
1142 | return -1; | |
1143 | } | |
1144 | ||
1145 | static int | |
1146 | ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq, | |
1147 | int event, | |
1148 | int nowait, | |
1149 | const struct nf_conntrack_expect *exp) | |
1150 | { | |
1151 | struct nlmsghdr *nlh; | |
1152 | struct nfgenmsg *nfmsg; | |
1153 | unsigned char *b; | |
1154 | ||
1155 | b = skb->tail; | |
1156 | ||
1157 | event |= NFNL_SUBSYS_CTNETLINK_EXP << 8; | |
1158 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); | |
1159 | nfmsg = NLMSG_DATA(nlh); | |
1160 | ||
1161 | nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; | |
1162 | nfmsg->nfgen_family = exp->tuple.src.l3num; | |
1163 | nfmsg->version = NFNETLINK_V0; | |
1164 | nfmsg->res_id = 0; | |
1165 | ||
1166 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) | |
1167 | goto nfattr_failure; | |
1168 | ||
1169 | nlh->nlmsg_len = skb->tail - b; | |
1170 | return skb->len; | |
1171 | ||
1172 | nlmsg_failure: | |
1173 | nfattr_failure: | |
1174 | skb_trim(skb, b - skb->data); | |
1175 | return -1; | |
1176 | } | |
1177 | ||
1178 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1179 | static int ctnetlink_expect_event(struct notifier_block *this, | |
1180 | unsigned long events, void *ptr) | |
1181 | { | |
1182 | struct nlmsghdr *nlh; | |
1183 | struct nfgenmsg *nfmsg; | |
1184 | struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr; | |
1185 | struct sk_buff *skb; | |
1186 | unsigned int type; | |
1187 | unsigned char *b; | |
1188 | int flags = 0; | |
1189 | ||
1190 | if (events & IPEXP_NEW) { | |
1191 | type = IPCTNL_MSG_EXP_NEW; | |
1192 | flags = NLM_F_CREATE|NLM_F_EXCL; | |
1193 | } else | |
1194 | return NOTIFY_DONE; | |
1195 | ||
b3a27bfb PNA |
1196 | if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW)) |
1197 | return NOTIFY_DONE; | |
1198 | ||
c1d10adb PNA |
1199 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
1200 | if (!skb) | |
1201 | return NOTIFY_DONE; | |
1202 | ||
1203 | b = skb->tail; | |
1204 | ||
b633ad5f | 1205 | type |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
c1d10adb PNA |
1206 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); |
1207 | nfmsg = NLMSG_DATA(nlh); | |
1208 | ||
1209 | nlh->nlmsg_flags = flags; | |
1210 | nfmsg->nfgen_family = exp->tuple.src.l3num; | |
1211 | nfmsg->version = NFNETLINK_V0; | |
1212 | nfmsg->res_id = 0; | |
1213 | ||
1214 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) | |
1215 | goto nfattr_failure; | |
1216 | ||
1217 | nlh->nlmsg_len = skb->tail - b; | |
1218 | nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0); | |
1219 | return NOTIFY_DONE; | |
1220 | ||
1221 | nlmsg_failure: | |
1222 | nfattr_failure: | |
1223 | kfree_skb(skb); | |
1224 | return NOTIFY_DONE; | |
1225 | } | |
1226 | #endif | |
1227 | ||
1228 | static int | |
1229 | ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb) | |
1230 | { | |
1231 | struct nf_conntrack_expect *exp = NULL; | |
1232 | struct list_head *i; | |
1233 | u_int32_t *id = (u_int32_t *) &cb->args[0]; | |
87711cb8 PNA |
1234 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
1235 | u_int8_t l3proto = nfmsg->nfgen_family; | |
c1d10adb | 1236 | |
c1d10adb PNA |
1237 | read_lock_bh(&nf_conntrack_lock); |
1238 | list_for_each_prev(i, &nf_conntrack_expect_list) { | |
1239 | exp = (struct nf_conntrack_expect *) i; | |
87711cb8 PNA |
1240 | if (l3proto && exp->tuple.src.l3num != l3proto) |
1241 | continue; | |
c1d10adb PNA |
1242 | if (exp->id <= *id) |
1243 | continue; | |
1244 | if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
1245 | cb->nlh->nlmsg_seq, | |
1246 | IPCTNL_MSG_EXP_NEW, | |
1247 | 1, exp) < 0) | |
1248 | goto out; | |
1249 | *id = exp->id; | |
1250 | } | |
1251 | out: | |
1252 | read_unlock_bh(&nf_conntrack_lock); | |
1253 | ||
c1d10adb PNA |
1254 | return skb->len; |
1255 | } | |
1256 | ||
1257 | static const size_t cta_min_exp[CTA_EXPECT_MAX] = { | |
1258 | [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t), | |
1259 | [CTA_EXPECT_ID-1] = sizeof(u_int32_t) | |
1260 | }; | |
1261 | ||
1262 | static int | |
1263 | ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, | |
1264 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
1265 | { | |
1266 | struct nf_conntrack_tuple tuple; | |
1267 | struct nf_conntrack_expect *exp; | |
1268 | struct sk_buff *skb2; | |
1269 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1270 | u_int8_t u3 = nfmsg->nfgen_family; | |
1271 | int err = 0; | |
1272 | ||
c1d10adb PNA |
1273 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
1274 | return -EINVAL; | |
1275 | ||
1276 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1277 | u32 rlen; | |
1278 | ||
c1d10adb PNA |
1279 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, |
1280 | ctnetlink_exp_dump_table, | |
1281 | ctnetlink_done)) != 0) | |
1282 | return -EINVAL; | |
1283 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1284 | if (rlen > skb->len) | |
1285 | rlen = skb->len; | |
1286 | skb_pull(skb, rlen); | |
1287 | return 0; | |
1288 | } | |
1289 | ||
1290 | if (cda[CTA_EXPECT_MASTER-1]) | |
1291 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3); | |
1292 | else | |
1293 | return -EINVAL; | |
1294 | ||
1295 | if (err < 0) | |
1296 | return err; | |
1297 | ||
468ec44b | 1298 | exp = nf_conntrack_expect_find_get(&tuple); |
c1d10adb PNA |
1299 | if (!exp) |
1300 | return -ENOENT; | |
1301 | ||
1302 | if (cda[CTA_EXPECT_ID-1]) { | |
bff9a89b | 1303 | __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]); |
c1d10adb PNA |
1304 | if (exp->id != ntohl(id)) { |
1305 | nf_conntrack_expect_put(exp); | |
1306 | return -ENOENT; | |
1307 | } | |
1308 | } | |
1309 | ||
1310 | err = -ENOMEM; | |
1311 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1312 | if (!skb2) | |
1313 | goto out; | |
4e9b8269 | 1314 | |
c1d10adb PNA |
1315 | err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid, |
1316 | nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, | |
1317 | 1, exp); | |
1318 | if (err <= 0) | |
1319 | goto free; | |
1320 | ||
1321 | nf_conntrack_expect_put(exp); | |
1322 | ||
1323 | return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1324 | ||
1325 | free: | |
1326 | kfree_skb(skb2); | |
1327 | out: | |
1328 | nf_conntrack_expect_put(exp); | |
1329 | return err; | |
1330 | } | |
1331 | ||
1332 | static int | |
1333 | ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb, | |
1334 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
1335 | { | |
1336 | struct nf_conntrack_expect *exp, *tmp; | |
1337 | struct nf_conntrack_tuple tuple; | |
1338 | struct nf_conntrack_helper *h; | |
1339 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1340 | u_int8_t u3 = nfmsg->nfgen_family; | |
1341 | int err; | |
1342 | ||
1343 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) | |
1344 | return -EINVAL; | |
1345 | ||
1346 | if (cda[CTA_EXPECT_TUPLE-1]) { | |
1347 | /* delete a single expect by tuple */ | |
1348 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); | |
1349 | if (err < 0) | |
1350 | return err; | |
1351 | ||
1352 | /* bump usage count to 2 */ | |
468ec44b | 1353 | exp = nf_conntrack_expect_find_get(&tuple); |
c1d10adb PNA |
1354 | if (!exp) |
1355 | return -ENOENT; | |
1356 | ||
1357 | if (cda[CTA_EXPECT_ID-1]) { | |
bff9a89b | 1358 | __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]); |
c1d10adb PNA |
1359 | if (exp->id != ntohl(id)) { |
1360 | nf_conntrack_expect_put(exp); | |
1361 | return -ENOENT; | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | /* after list removal, usage count == 1 */ | |
1366 | nf_conntrack_unexpect_related(exp); | |
1367 | /* have to put what we 'get' above. | |
1368 | * after this line usage count == 0 */ | |
1369 | nf_conntrack_expect_put(exp); | |
1370 | } else if (cda[CTA_EXPECT_HELP_NAME-1]) { | |
1371 | char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]); | |
1372 | ||
1373 | /* delete all expectations for this helper */ | |
1374 | write_lock_bh(&nf_conntrack_lock); | |
1375 | h = __nf_conntrack_helper_find_byname(name); | |
1376 | if (!h) { | |
1377 | write_unlock_bh(&nf_conntrack_lock); | |
1378 | return -EINVAL; | |
1379 | } | |
1380 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, | |
1381 | list) { | |
dc808fe2 HW |
1382 | struct nf_conn_help *m_help = nfct_help(exp->master); |
1383 | if (m_help->helper == h | |
c1d10adb PNA |
1384 | && del_timer(&exp->timeout)) { |
1385 | nf_ct_unlink_expect(exp); | |
1386 | nf_conntrack_expect_put(exp); | |
1387 | } | |
1388 | } | |
1389 | write_unlock_bh(&nf_conntrack_lock); | |
1390 | } else { | |
1391 | /* This basically means we have to flush everything*/ | |
1392 | write_lock_bh(&nf_conntrack_lock); | |
1393 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, | |
1394 | list) { | |
1395 | if (del_timer(&exp->timeout)) { | |
1396 | nf_ct_unlink_expect(exp); | |
1397 | nf_conntrack_expect_put(exp); | |
1398 | } | |
1399 | } | |
1400 | write_unlock_bh(&nf_conntrack_lock); | |
1401 | } | |
1402 | ||
1403 | return 0; | |
1404 | } | |
1405 | static int | |
1406 | ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[]) | |
1407 | { | |
1408 | return -EOPNOTSUPP; | |
1409 | } | |
1410 | ||
1411 | static int | |
1412 | ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3) | |
1413 | { | |
1414 | struct nf_conntrack_tuple tuple, mask, master_tuple; | |
1415 | struct nf_conntrack_tuple_hash *h = NULL; | |
1416 | struct nf_conntrack_expect *exp; | |
1417 | struct nf_conn *ct; | |
dc808fe2 | 1418 | struct nf_conn_help *help; |
c1d10adb PNA |
1419 | int err = 0; |
1420 | ||
c1d10adb PNA |
1421 | /* caller guarantees that those three CTA_EXPECT_* exist */ |
1422 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); | |
1423 | if (err < 0) | |
1424 | return err; | |
1425 | err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3); | |
1426 | if (err < 0) | |
1427 | return err; | |
1428 | err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3); | |
1429 | if (err < 0) | |
1430 | return err; | |
1431 | ||
1432 | /* Look for master conntrack of this expectation */ | |
1433 | h = nf_conntrack_find_get(&master_tuple, NULL); | |
1434 | if (!h) | |
1435 | return -ENOENT; | |
1436 | ct = nf_ct_tuplehash_to_ctrack(h); | |
dc808fe2 | 1437 | help = nfct_help(ct); |
c1d10adb | 1438 | |
dc808fe2 | 1439 | if (!help || !help->helper) { |
c1d10adb PNA |
1440 | /* such conntrack hasn't got any helper, abort */ |
1441 | err = -EINVAL; | |
1442 | goto out; | |
1443 | } | |
1444 | ||
1445 | exp = nf_conntrack_expect_alloc(ct); | |
1446 | if (!exp) { | |
1447 | err = -ENOMEM; | |
1448 | goto out; | |
1449 | } | |
1450 | ||
1451 | exp->expectfn = NULL; | |
1452 | exp->flags = 0; | |
1453 | exp->master = ct; | |
9457d851 | 1454 | exp->helper = NULL; |
c1d10adb PNA |
1455 | memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple)); |
1456 | memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple)); | |
1457 | ||
1458 | err = nf_conntrack_expect_related(exp); | |
1459 | nf_conntrack_expect_put(exp); | |
1460 | ||
1461 | out: | |
1462 | nf_ct_put(nf_ct_tuplehash_to_ctrack(h)); | |
1463 | return err; | |
1464 | } | |
1465 | ||
1466 | static int | |
1467 | ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb, | |
1468 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) | |
1469 | { | |
1470 | struct nf_conntrack_tuple tuple; | |
1471 | struct nf_conntrack_expect *exp; | |
1472 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
1473 | u_int8_t u3 = nfmsg->nfgen_family; | |
1474 | int err = 0; | |
1475 | ||
c1d10adb PNA |
1476 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
1477 | return -EINVAL; | |
1478 | ||
1479 | if (!cda[CTA_EXPECT_TUPLE-1] | |
1480 | || !cda[CTA_EXPECT_MASK-1] | |
1481 | || !cda[CTA_EXPECT_MASTER-1]) | |
1482 | return -EINVAL; | |
1483 | ||
1484 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); | |
1485 | if (err < 0) | |
1486 | return err; | |
1487 | ||
1488 | write_lock_bh(&nf_conntrack_lock); | |
1489 | exp = __nf_conntrack_expect_find(&tuple); | |
1490 | ||
1491 | if (!exp) { | |
1492 | write_unlock_bh(&nf_conntrack_lock); | |
1493 | err = -ENOENT; | |
1494 | if (nlh->nlmsg_flags & NLM_F_CREATE) | |
1495 | err = ctnetlink_create_expect(cda, u3); | |
1496 | return err; | |
1497 | } | |
1498 | ||
1499 | err = -EEXIST; | |
1500 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) | |
1501 | err = ctnetlink_change_expect(exp, cda); | |
1502 | write_unlock_bh(&nf_conntrack_lock); | |
1503 | ||
c1d10adb PNA |
1504 | return err; |
1505 | } | |
1506 | ||
1507 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1508 | static struct notifier_block ctnl_notifier = { | |
1509 | .notifier_call = ctnetlink_conntrack_event, | |
1510 | }; | |
1511 | ||
1512 | static struct notifier_block ctnl_notifier_exp = { | |
1513 | .notifier_call = ctnetlink_expect_event, | |
1514 | }; | |
1515 | #endif | |
1516 | ||
1517 | static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = { | |
1518 | [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack, | |
1519 | .attr_count = CTA_MAX, }, | |
1520 | [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack, | |
1521 | .attr_count = CTA_MAX, }, | |
1522 | [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack, | |
1523 | .attr_count = CTA_MAX, }, | |
1524 | [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack, | |
1525 | .attr_count = CTA_MAX, }, | |
1526 | }; | |
1527 | ||
1528 | static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = { | |
1529 | [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect, | |
1530 | .attr_count = CTA_EXPECT_MAX, }, | |
1531 | [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect, | |
1532 | .attr_count = CTA_EXPECT_MAX, }, | |
1533 | [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect, | |
1534 | .attr_count = CTA_EXPECT_MAX, }, | |
1535 | }; | |
1536 | ||
1537 | static struct nfnetlink_subsystem ctnl_subsys = { | |
1538 | .name = "conntrack", | |
1539 | .subsys_id = NFNL_SUBSYS_CTNETLINK, | |
1540 | .cb_count = IPCTNL_MSG_MAX, | |
1541 | .cb = ctnl_cb, | |
1542 | }; | |
1543 | ||
1544 | static struct nfnetlink_subsystem ctnl_exp_subsys = { | |
1545 | .name = "conntrack_expect", | |
1546 | .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP, | |
1547 | .cb_count = IPCTNL_MSG_EXP_MAX, | |
1548 | .cb = ctnl_exp_cb, | |
1549 | }; | |
1550 | ||
d2483dde | 1551 | MODULE_ALIAS("ip_conntrack_netlink"); |
c1d10adb | 1552 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK); |
34f9a2e4 | 1553 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP); |
c1d10adb PNA |
1554 | |
1555 | static int __init ctnetlink_init(void) | |
1556 | { | |
1557 | int ret; | |
1558 | ||
1559 | printk("ctnetlink v%s: registering with nfnetlink.\n", version); | |
1560 | ret = nfnetlink_subsys_register(&ctnl_subsys); | |
1561 | if (ret < 0) { | |
1562 | printk("ctnetlink_init: cannot register with nfnetlink.\n"); | |
1563 | goto err_out; | |
1564 | } | |
1565 | ||
1566 | ret = nfnetlink_subsys_register(&ctnl_exp_subsys); | |
1567 | if (ret < 0) { | |
1568 | printk("ctnetlink_init: cannot register exp with nfnetlink.\n"); | |
1569 | goto err_unreg_subsys; | |
1570 | } | |
1571 | ||
1572 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1573 | ret = nf_conntrack_register_notifier(&ctnl_notifier); | |
1574 | if (ret < 0) { | |
1575 | printk("ctnetlink_init: cannot register notifier.\n"); | |
1576 | goto err_unreg_exp_subsys; | |
1577 | } | |
1578 | ||
1579 | ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp); | |
1580 | if (ret < 0) { | |
1581 | printk("ctnetlink_init: cannot expect register notifier.\n"); | |
1582 | goto err_unreg_notifier; | |
1583 | } | |
1584 | #endif | |
1585 | ||
1586 | return 0; | |
1587 | ||
1588 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
1589 | err_unreg_notifier: | |
1590 | nf_conntrack_unregister_notifier(&ctnl_notifier); | |
1591 | err_unreg_exp_subsys: | |
1592 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); | |
1593 | #endif | |
1594 | err_unreg_subsys: | |
1595 | nfnetlink_subsys_unregister(&ctnl_subsys); | |
1596 | err_out: | |
1597 | return ret; | |
1598 | } | |
1599 | ||
1600 | static void __exit ctnetlink_exit(void) | |
1601 | { | |
1602 | printk("ctnetlink: unregistering from nfnetlink.\n"); | |
1603 | ||
1604 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
e64a70be | 1605 | nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp); |
c1d10adb PNA |
1606 | nf_conntrack_unregister_notifier(&ctnl_notifier); |
1607 | #endif | |
1608 | ||
1609 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); | |
1610 | nfnetlink_subsys_unregister(&ctnl_subsys); | |
1611 | return; | |
1612 | } | |
1613 | ||
1614 | module_init(ctnetlink_init); | |
1615 | module_exit(ctnetlink_exit); |