Root/
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> |
5 | * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org> |
6 | * (C) 2003 by Patrick Mchardy <kaber@trash.net> |
7 | * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org> |
8 | * |
9 | * Initial connection tracking via netlink development funded and |
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. |
16 | */ |
17 | |
18 | #include <linux/init.h> |
19 | #include <linux/module.h> |
20 | #include <linux/kernel.h> |
21 | #include <linux/rculist.h> |
22 | #include <linux/rculist_nulls.h> |
23 | #include <linux/types.h> |
24 | #include <linux/timer.h> |
25 | #include <linux/skbuff.h> |
26 | #include <linux/errno.h> |
27 | #include <linux/netlink.h> |
28 | #include <linux/spinlock.h> |
29 | #include <linux/interrupt.h> |
30 | #include <linux/slab.h> |
31 | |
32 | #include <linux/netfilter.h> |
33 | #include <net/netlink.h> |
34 | #include <net/sock.h> |
35 | #include <net/netfilter/nf_conntrack.h> |
36 | #include <net/netfilter/nf_conntrack_core.h> |
37 | #include <net/netfilter/nf_conntrack_expect.h> |
38 | #include <net/netfilter/nf_conntrack_helper.h> |
39 | #include <net/netfilter/nf_conntrack_l3proto.h> |
40 | #include <net/netfilter/nf_conntrack_l4proto.h> |
41 | #include <net/netfilter/nf_conntrack_tuple.h> |
42 | #include <net/netfilter/nf_conntrack_acct.h> |
43 | #include <net/netfilter/nf_conntrack_zones.h> |
44 | #ifdef CONFIG_NF_NAT_NEEDED |
45 | #include <net/netfilter/nf_nat_core.h> |
46 | #include <net/netfilter/nf_nat_protocol.h> |
47 | #endif |
48 | |
49 | #include <linux/netfilter/nfnetlink.h> |
50 | #include <linux/netfilter/nfnetlink_conntrack.h> |
51 | |
52 | MODULE_LICENSE("GPL"); |
53 | |
54 | static char __initdata version[] = "0.93"; |
55 | |
56 | static inline int |
57 | ctnetlink_dump_tuples_proto(struct sk_buff *skb, |
58 | const struct nf_conntrack_tuple *tuple, |
59 | struct nf_conntrack_l4proto *l4proto) |
60 | { |
61 | int ret = 0; |
62 | struct nlattr *nest_parms; |
63 | |
64 | nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED); |
65 | if (!nest_parms) |
66 | goto nla_put_failure; |
67 | NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum); |
68 | |
69 | if (likely(l4proto->tuple_to_nlattr)) |
70 | ret = l4proto->tuple_to_nlattr(skb, tuple); |
71 | |
72 | nla_nest_end(skb, nest_parms); |
73 | |
74 | return ret; |
75 | |
76 | nla_put_failure: |
77 | return -1; |
78 | } |
79 | |
80 | static inline int |
81 | ctnetlink_dump_tuples_ip(struct sk_buff *skb, |
82 | const struct nf_conntrack_tuple *tuple, |
83 | struct nf_conntrack_l3proto *l3proto) |
84 | { |
85 | int ret = 0; |
86 | struct nlattr *nest_parms; |
87 | |
88 | nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED); |
89 | if (!nest_parms) |
90 | goto nla_put_failure; |
91 | |
92 | if (likely(l3proto->tuple_to_nlattr)) |
93 | ret = l3proto->tuple_to_nlattr(skb, tuple); |
94 | |
95 | nla_nest_end(skb, nest_parms); |
96 | |
97 | return ret; |
98 | |
99 | nla_put_failure: |
100 | return -1; |
101 | } |
102 | |
103 | static int |
104 | ctnetlink_dump_tuples(struct sk_buff *skb, |
105 | const struct nf_conntrack_tuple *tuple) |
106 | { |
107 | int ret; |
108 | struct nf_conntrack_l3proto *l3proto; |
109 | struct nf_conntrack_l4proto *l4proto; |
110 | |
111 | l3proto = __nf_ct_l3proto_find(tuple->src.l3num); |
112 | ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto); |
113 | |
114 | if (unlikely(ret < 0)) |
115 | return ret; |
116 | |
117 | l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum); |
118 | ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto); |
119 | |
120 | return ret; |
121 | } |
122 | |
123 | static inline int |
124 | ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct) |
125 | { |
126 | NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status)); |
127 | return 0; |
128 | |
129 | nla_put_failure: |
130 | return -1; |
131 | } |
132 | |
133 | static inline int |
134 | ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct) |
135 | { |
136 | long timeout = (ct->timeout.expires - jiffies) / HZ; |
137 | |
138 | if (timeout < 0) |
139 | timeout = 0; |
140 | |
141 | NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout)); |
142 | return 0; |
143 | |
144 | nla_put_failure: |
145 | return -1; |
146 | } |
147 | |
148 | static inline int |
149 | ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct) |
150 | { |
151 | struct nf_conntrack_l4proto *l4proto; |
152 | struct nlattr *nest_proto; |
153 | int ret; |
154 | |
155 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
156 | if (!l4proto->to_nlattr) |
157 | return 0; |
158 | |
159 | nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED); |
160 | if (!nest_proto) |
161 | goto nla_put_failure; |
162 | |
163 | ret = l4proto->to_nlattr(skb, nest_proto, ct); |
164 | |
165 | nla_nest_end(skb, nest_proto); |
166 | |
167 | return ret; |
168 | |
169 | nla_put_failure: |
170 | return -1; |
171 | } |
172 | |
173 | static inline int |
174 | ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct) |
175 | { |
176 | struct nlattr *nest_helper; |
177 | const struct nf_conn_help *help = nfct_help(ct); |
178 | struct nf_conntrack_helper *helper; |
179 | |
180 | if (!help) |
181 | return 0; |
182 | |
183 | helper = rcu_dereference(help->helper); |
184 | if (!helper) |
185 | goto out; |
186 | |
187 | nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED); |
188 | if (!nest_helper) |
189 | goto nla_put_failure; |
190 | NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name); |
191 | |
192 | if (helper->to_nlattr) |
193 | helper->to_nlattr(skb, ct); |
194 | |
195 | nla_nest_end(skb, nest_helper); |
196 | out: |
197 | return 0; |
198 | |
199 | nla_put_failure: |
200 | return -1; |
201 | } |
202 | |
203 | static int |
204 | ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct, |
205 | enum ip_conntrack_dir dir) |
206 | { |
207 | enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG; |
208 | struct nlattr *nest_count; |
209 | const struct nf_conn_counter *acct; |
210 | |
211 | acct = nf_conn_acct_find(ct); |
212 | if (!acct) |
213 | return 0; |
214 | |
215 | nest_count = nla_nest_start(skb, type | NLA_F_NESTED); |
216 | if (!nest_count) |
217 | goto nla_put_failure; |
218 | |
219 | NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS, |
220 | cpu_to_be64(acct[dir].packets)); |
221 | NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES, |
222 | cpu_to_be64(acct[dir].bytes)); |
223 | |
224 | nla_nest_end(skb, nest_count); |
225 | |
226 | return 0; |
227 | |
228 | nla_put_failure: |
229 | return -1; |
230 | } |
231 | |
232 | #ifdef CONFIG_NF_CONNTRACK_MARK |
233 | static inline int |
234 | ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct) |
235 | { |
236 | NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark)); |
237 | return 0; |
238 | |
239 | nla_put_failure: |
240 | return -1; |
241 | } |
242 | #else |
243 | #define ctnetlink_dump_mark(a, b) (0) |
244 | #endif |
245 | |
246 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
247 | static inline int |
248 | ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct) |
249 | { |
250 | NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark)); |
251 | return 0; |
252 | |
253 | nla_put_failure: |
254 | return -1; |
255 | } |
256 | #else |
257 | #define ctnetlink_dump_secmark(a, b) (0) |
258 | #endif |
259 | |
260 | #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple) |
261 | |
262 | static inline int |
263 | ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct) |
264 | { |
265 | struct nlattr *nest_parms; |
266 | |
267 | if (!(ct->status & IPS_EXPECTED)) |
268 | return 0; |
269 | |
270 | nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED); |
271 | if (!nest_parms) |
272 | goto nla_put_failure; |
273 | if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0) |
274 | goto nla_put_failure; |
275 | nla_nest_end(skb, nest_parms); |
276 | |
277 | return 0; |
278 | |
279 | nla_put_failure: |
280 | return -1; |
281 | } |
282 | |
283 | #ifdef CONFIG_NF_NAT_NEEDED |
284 | static int |
285 | dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type) |
286 | { |
287 | struct nlattr *nest_parms; |
288 | |
289 | nest_parms = nla_nest_start(skb, type | NLA_F_NESTED); |
290 | if (!nest_parms) |
291 | goto nla_put_failure; |
292 | |
293 | NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS, |
294 | htonl(natseq->correction_pos)); |
295 | NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE, |
296 | htonl(natseq->offset_before)); |
297 | NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER, |
298 | htonl(natseq->offset_after)); |
299 | |
300 | nla_nest_end(skb, nest_parms); |
301 | |
302 | return 0; |
303 | |
304 | nla_put_failure: |
305 | return -1; |
306 | } |
307 | |
308 | static inline int |
309 | ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct) |
310 | { |
311 | struct nf_nat_seq *natseq; |
312 | struct nf_conn_nat *nat = nfct_nat(ct); |
313 | |
314 | if (!(ct->status & IPS_SEQ_ADJUST) || !nat) |
315 | return 0; |
316 | |
317 | natseq = &nat->seq[IP_CT_DIR_ORIGINAL]; |
318 | if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1) |
319 | return -1; |
320 | |
321 | natseq = &nat->seq[IP_CT_DIR_REPLY]; |
322 | if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1) |
323 | return -1; |
324 | |
325 | return 0; |
326 | } |
327 | #else |
328 | #define ctnetlink_dump_nat_seq_adj(a, b) (0) |
329 | #endif |
330 | |
331 | static inline int |
332 | ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct) |
333 | { |
334 | NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct)); |
335 | return 0; |
336 | |
337 | nla_put_failure: |
338 | return -1; |
339 | } |
340 | |
341 | static inline int |
342 | ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct) |
343 | { |
344 | NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))); |
345 | return 0; |
346 | |
347 | nla_put_failure: |
348 | return -1; |
349 | } |
350 | |
351 | static int |
352 | ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
353 | int event, struct nf_conn *ct) |
354 | { |
355 | struct nlmsghdr *nlh; |
356 | struct nfgenmsg *nfmsg; |
357 | struct nlattr *nest_parms; |
358 | unsigned int flags = pid ? NLM_F_MULTI : 0; |
359 | |
360 | event |= NFNL_SUBSYS_CTNETLINK << 8; |
361 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags); |
362 | if (nlh == NULL) |
363 | goto nlmsg_failure; |
364 | |
365 | nfmsg = nlmsg_data(nlh); |
366 | nfmsg->nfgen_family = nf_ct_l3num(ct); |
367 | nfmsg->version = NFNETLINK_V0; |
368 | nfmsg->res_id = 0; |
369 | |
370 | nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED); |
371 | if (!nest_parms) |
372 | goto nla_put_failure; |
373 | if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
374 | goto nla_put_failure; |
375 | nla_nest_end(skb, nest_parms); |
376 | |
377 | nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED); |
378 | if (!nest_parms) |
379 | goto nla_put_failure; |
380 | if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0) |
381 | goto nla_put_failure; |
382 | nla_nest_end(skb, nest_parms); |
383 | |
384 | if (nf_ct_zone(ct)) |
385 | NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct))); |
386 | |
387 | if (ctnetlink_dump_status(skb, ct) < 0 || |
388 | ctnetlink_dump_timeout(skb, ct) < 0 || |
389 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || |
390 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 || |
391 | ctnetlink_dump_protoinfo(skb, ct) < 0 || |
392 | ctnetlink_dump_helpinfo(skb, ct) < 0 || |
393 | ctnetlink_dump_mark(skb, ct) < 0 || |
394 | ctnetlink_dump_secmark(skb, ct) < 0 || |
395 | ctnetlink_dump_id(skb, ct) < 0 || |
396 | ctnetlink_dump_use(skb, ct) < 0 || |
397 | ctnetlink_dump_master(skb, ct) < 0 || |
398 | ctnetlink_dump_nat_seq_adj(skb, ct) < 0) |
399 | goto nla_put_failure; |
400 | |
401 | nlmsg_end(skb, nlh); |
402 | return skb->len; |
403 | |
404 | nlmsg_failure: |
405 | nla_put_failure: |
406 | nlmsg_cancel(skb, nlh); |
407 | return -1; |
408 | } |
409 | |
410 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
411 | static inline size_t |
412 | ctnetlink_proto_size(const struct nf_conn *ct) |
413 | { |
414 | struct nf_conntrack_l3proto *l3proto; |
415 | struct nf_conntrack_l4proto *l4proto; |
416 | size_t len = 0; |
417 | |
418 | rcu_read_lock(); |
419 | l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct)); |
420 | len += l3proto->nla_size; |
421 | |
422 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
423 | len += l4proto->nla_size; |
424 | rcu_read_unlock(); |
425 | |
426 | return len; |
427 | } |
428 | |
429 | static inline size_t |
430 | ctnetlink_nlmsg_size(const struct nf_conn *ct) |
431 | { |
432 | return NLMSG_ALIGN(sizeof(struct nfgenmsg)) |
433 | + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */ |
434 | + 3 * nla_total_size(0) /* CTA_TUPLE_IP */ |
435 | + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */ |
436 | + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */ |
437 | + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */ |
438 | + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */ |
439 | #ifdef CONFIG_NF_CT_ACCT |
440 | + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */ |
441 | + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */ |
442 | + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */ |
443 | #endif |
444 | + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */ |
445 | + nla_total_size(0) /* CTA_PROTOINFO */ |
446 | + nla_total_size(0) /* CTA_HELP */ |
447 | + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */ |
448 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
449 | + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */ |
450 | #endif |
451 | #ifdef CONFIG_NF_NAT_NEEDED |
452 | + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */ |
453 | + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */ |
454 | #endif |
455 | #ifdef CONFIG_NF_CONNTRACK_MARK |
456 | + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */ |
457 | #endif |
458 | + ctnetlink_proto_size(ct) |
459 | ; |
460 | } |
461 | |
462 | static int |
463 | ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item) |
464 | { |
465 | struct net *net; |
466 | struct nlmsghdr *nlh; |
467 | struct nfgenmsg *nfmsg; |
468 | struct nlattr *nest_parms; |
469 | struct nf_conn *ct = item->ct; |
470 | struct sk_buff *skb; |
471 | unsigned int type; |
472 | unsigned int flags = 0, group; |
473 | int err; |
474 | |
475 | /* ignore our fake conntrack entry */ |
476 | if (ct == &nf_conntrack_untracked) |
477 | return 0; |
478 | |
479 | if (events & (1 << IPCT_DESTROY)) { |
480 | type = IPCTNL_MSG_CT_DELETE; |
481 | group = NFNLGRP_CONNTRACK_DESTROY; |
482 | } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) { |
483 | type = IPCTNL_MSG_CT_NEW; |
484 | flags = NLM_F_CREATE|NLM_F_EXCL; |
485 | group = NFNLGRP_CONNTRACK_NEW; |
486 | } else if (events) { |
487 | type = IPCTNL_MSG_CT_NEW; |
488 | group = NFNLGRP_CONNTRACK_UPDATE; |
489 | } else |
490 | return 0; |
491 | |
492 | net = nf_ct_net(ct); |
493 | if (!item->report && !nfnetlink_has_listeners(net, group)) |
494 | return 0; |
495 | |
496 | skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC); |
497 | if (skb == NULL) |
498 | goto errout; |
499 | |
500 | type |= NFNL_SUBSYS_CTNETLINK << 8; |
501 | nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags); |
502 | if (nlh == NULL) |
503 | goto nlmsg_failure; |
504 | |
505 | nfmsg = nlmsg_data(nlh); |
506 | nfmsg->nfgen_family = nf_ct_l3num(ct); |
507 | nfmsg->version = NFNETLINK_V0; |
508 | nfmsg->res_id = 0; |
509 | |
510 | rcu_read_lock(); |
511 | nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED); |
512 | if (!nest_parms) |
513 | goto nla_put_failure; |
514 | if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
515 | goto nla_put_failure; |
516 | nla_nest_end(skb, nest_parms); |
517 | |
518 | nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED); |
519 | if (!nest_parms) |
520 | goto nla_put_failure; |
521 | if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0) |
522 | goto nla_put_failure; |
523 | nla_nest_end(skb, nest_parms); |
524 | |
525 | if (nf_ct_zone(ct)) |
526 | NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct))); |
527 | |
528 | if (ctnetlink_dump_id(skb, ct) < 0) |
529 | goto nla_put_failure; |
530 | |
531 | if (ctnetlink_dump_status(skb, ct) < 0) |
532 | goto nla_put_failure; |
533 | |
534 | if (events & (1 << IPCT_DESTROY)) { |
535 | if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || |
536 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0) |
537 | goto nla_put_failure; |
538 | } else { |
539 | if (ctnetlink_dump_timeout(skb, ct) < 0) |
540 | goto nla_put_failure; |
541 | |
542 | if (events & (1 << IPCT_PROTOINFO) |
543 | && ctnetlink_dump_protoinfo(skb, ct) < 0) |
544 | goto nla_put_failure; |
545 | |
546 | if ((events & (1 << IPCT_HELPER) || nfct_help(ct)) |
547 | && ctnetlink_dump_helpinfo(skb, ct) < 0) |
548 | goto nla_put_failure; |
549 | |
550 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
551 | if ((events & (1 << IPCT_SECMARK) || ct->secmark) |
552 | && ctnetlink_dump_secmark(skb, ct) < 0) |
553 | goto nla_put_failure; |
554 | #endif |
555 | |
556 | if (events & (1 << IPCT_RELATED) && |
557 | ctnetlink_dump_master(skb, ct) < 0) |
558 | goto nla_put_failure; |
559 | |
560 | if (events & (1 << IPCT_NATSEQADJ) && |
561 | ctnetlink_dump_nat_seq_adj(skb, ct) < 0) |
562 | goto nla_put_failure; |
563 | } |
564 | |
565 | #ifdef CONFIG_NF_CONNTRACK_MARK |
566 | if ((events & (1 << IPCT_MARK) || ct->mark) |
567 | && ctnetlink_dump_mark(skb, ct) < 0) |
568 | goto nla_put_failure; |
569 | #endif |
570 | rcu_read_unlock(); |
571 | |
572 | nlmsg_end(skb, nlh); |
573 | err = nfnetlink_send(skb, net, item->pid, group, item->report, |
574 | GFP_ATOMIC); |
575 | if (err == -ENOBUFS || err == -EAGAIN) |
576 | return -ENOBUFS; |
577 | |
578 | return 0; |
579 | |
580 | nla_put_failure: |
581 | rcu_read_unlock(); |
582 | nlmsg_cancel(skb, nlh); |
583 | nlmsg_failure: |
584 | kfree_skb(skb); |
585 | errout: |
586 | if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0) |
587 | return -ENOBUFS; |
588 | |
589 | return 0; |
590 | } |
591 | #endif /* CONFIG_NF_CONNTRACK_EVENTS */ |
592 | |
593 | static int ctnetlink_done(struct netlink_callback *cb) |
594 | { |
595 | if (cb->args[1]) |
596 | nf_ct_put((struct nf_conn *)cb->args[1]); |
597 | return 0; |
598 | } |
599 | |
600 | static int |
601 | ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
602 | { |
603 | struct net *net = sock_net(skb->sk); |
604 | struct nf_conn *ct, *last; |
605 | struct nf_conntrack_tuple_hash *h; |
606 | struct hlist_nulls_node *n; |
607 | struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
608 | u_int8_t l3proto = nfmsg->nfgen_family; |
609 | |
610 | rcu_read_lock(); |
611 | last = (struct nf_conn *)cb->args[1]; |
612 | for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) { |
613 | restart: |
614 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]], |
615 | hnnode) { |
616 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
617 | continue; |
618 | ct = nf_ct_tuplehash_to_ctrack(h); |
619 | if (!atomic_inc_not_zero(&ct->ct_general.use)) |
620 | continue; |
621 | /* Dump entries of a given L3 protocol number. |
622 | * If it is not specified, ie. l3proto == 0, |
623 | * then dump everything. */ |
624 | if (l3proto && nf_ct_l3num(ct) != l3proto) |
625 | goto releasect; |
626 | if (cb->args[1]) { |
627 | if (ct != last) |
628 | goto releasect; |
629 | cb->args[1] = 0; |
630 | } |
631 | if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid, |
632 | cb->nlh->nlmsg_seq, |
633 | IPCTNL_MSG_CT_NEW, ct) < 0) { |
634 | cb->args[1] = (unsigned long)ct; |
635 | goto out; |
636 | } |
637 | |
638 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == |
639 | IPCTNL_MSG_CT_GET_CTRZERO) { |
640 | struct nf_conn_counter *acct; |
641 | |
642 | acct = nf_conn_acct_find(ct); |
643 | if (acct) |
644 | memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX])); |
645 | } |
646 | releasect: |
647 | nf_ct_put(ct); |
648 | } |
649 | if (cb->args[1]) { |
650 | cb->args[1] = 0; |
651 | goto restart; |
652 | } |
653 | } |
654 | out: |
655 | rcu_read_unlock(); |
656 | if (last) |
657 | nf_ct_put(last); |
658 | |
659 | return skb->len; |
660 | } |
661 | |
662 | static inline int |
663 | ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple) |
664 | { |
665 | struct nlattr *tb[CTA_IP_MAX+1]; |
666 | struct nf_conntrack_l3proto *l3proto; |
667 | int ret = 0; |
668 | |
669 | nla_parse_nested(tb, CTA_IP_MAX, attr, NULL); |
670 | |
671 | rcu_read_lock(); |
672 | l3proto = __nf_ct_l3proto_find(tuple->src.l3num); |
673 | |
674 | if (likely(l3proto->nlattr_to_tuple)) { |
675 | ret = nla_validate_nested(attr, CTA_IP_MAX, |
676 | l3proto->nla_policy); |
677 | if (ret == 0) |
678 | ret = l3proto->nlattr_to_tuple(tb, tuple); |
679 | } |
680 | |
681 | rcu_read_unlock(); |
682 | |
683 | return ret; |
684 | } |
685 | |
686 | static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = { |
687 | [CTA_PROTO_NUM] = { .type = NLA_U8 }, |
688 | }; |
689 | |
690 | static inline int |
691 | ctnetlink_parse_tuple_proto(struct nlattr *attr, |
692 | struct nf_conntrack_tuple *tuple) |
693 | { |
694 | struct nlattr *tb[CTA_PROTO_MAX+1]; |
695 | struct nf_conntrack_l4proto *l4proto; |
696 | int ret = 0; |
697 | |
698 | ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy); |
699 | if (ret < 0) |
700 | return ret; |
701 | |
702 | if (!tb[CTA_PROTO_NUM]) |
703 | return -EINVAL; |
704 | tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]); |
705 | |
706 | rcu_read_lock(); |
707 | l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum); |
708 | |
709 | if (likely(l4proto->nlattr_to_tuple)) { |
710 | ret = nla_validate_nested(attr, CTA_PROTO_MAX, |
711 | l4proto->nla_policy); |
712 | if (ret == 0) |
713 | ret = l4proto->nlattr_to_tuple(tb, tuple); |
714 | } |
715 | |
716 | rcu_read_unlock(); |
717 | |
718 | return ret; |
719 | } |
720 | |
721 | static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = { |
722 | [CTA_TUPLE_IP] = { .type = NLA_NESTED }, |
723 | [CTA_TUPLE_PROTO] = { .type = NLA_NESTED }, |
724 | }; |
725 | |
726 | static int |
727 | ctnetlink_parse_tuple(const struct nlattr * const cda[], |
728 | struct nf_conntrack_tuple *tuple, |
729 | enum ctattr_tuple type, u_int8_t l3num) |
730 | { |
731 | struct nlattr *tb[CTA_TUPLE_MAX+1]; |
732 | int err; |
733 | |
734 | memset(tuple, 0, sizeof(*tuple)); |
735 | |
736 | nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy); |
737 | |
738 | if (!tb[CTA_TUPLE_IP]) |
739 | return -EINVAL; |
740 | |
741 | tuple->src.l3num = l3num; |
742 | |
743 | err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple); |
744 | if (err < 0) |
745 | return err; |
746 | |
747 | if (!tb[CTA_TUPLE_PROTO]) |
748 | return -EINVAL; |
749 | |
750 | err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple); |
751 | if (err < 0) |
752 | return err; |
753 | |
754 | /* orig and expect tuples get DIR_ORIGINAL */ |
755 | if (type == CTA_TUPLE_REPLY) |
756 | tuple->dst.dir = IP_CT_DIR_REPLY; |
757 | else |
758 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
759 | |
760 | return 0; |
761 | } |
762 | |
763 | static int |
764 | ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone) |
765 | { |
766 | if (attr) |
767 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
768 | *zone = ntohs(nla_get_be16(attr)); |
769 | #else |
770 | return -EOPNOTSUPP; |
771 | #endif |
772 | else |
773 | *zone = 0; |
774 | |
775 | return 0; |
776 | } |
777 | |
778 | static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = { |
779 | [CTA_HELP_NAME] = { .type = NLA_NUL_STRING }, |
780 | }; |
781 | |
782 | static inline int |
783 | ctnetlink_parse_help(const struct nlattr *attr, char **helper_name) |
784 | { |
785 | struct nlattr *tb[CTA_HELP_MAX+1]; |
786 | |
787 | nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy); |
788 | |
789 | if (!tb[CTA_HELP_NAME]) |
790 | return -EINVAL; |
791 | |
792 | *helper_name = nla_data(tb[CTA_HELP_NAME]); |
793 | |
794 | return 0; |
795 | } |
796 | |
797 | static const struct nla_policy ct_nla_policy[CTA_MAX+1] = { |
798 | [CTA_TUPLE_ORIG] = { .type = NLA_NESTED }, |
799 | [CTA_TUPLE_REPLY] = { .type = NLA_NESTED }, |
800 | [CTA_STATUS] = { .type = NLA_U32 }, |
801 | [CTA_PROTOINFO] = { .type = NLA_NESTED }, |
802 | [CTA_HELP] = { .type = NLA_NESTED }, |
803 | [CTA_NAT_SRC] = { .type = NLA_NESTED }, |
804 | [CTA_TIMEOUT] = { .type = NLA_U32 }, |
805 | [CTA_MARK] = { .type = NLA_U32 }, |
806 | [CTA_ID] = { .type = NLA_U32 }, |
807 | [CTA_NAT_DST] = { .type = NLA_NESTED }, |
808 | [CTA_TUPLE_MASTER] = { .type = NLA_NESTED }, |
809 | [CTA_ZONE] = { .type = NLA_U16 }, |
810 | }; |
811 | |
812 | static int |
813 | ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, |
814 | const struct nlmsghdr *nlh, |
815 | const struct nlattr * const cda[]) |
816 | { |
817 | struct net *net = sock_net(ctnl); |
818 | struct nf_conntrack_tuple_hash *h; |
819 | struct nf_conntrack_tuple tuple; |
820 | struct nf_conn *ct; |
821 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
822 | u_int8_t u3 = nfmsg->nfgen_family; |
823 | u16 zone; |
824 | int err; |
825 | |
826 | err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone); |
827 | if (err < 0) |
828 | return err; |
829 | |
830 | if (cda[CTA_TUPLE_ORIG]) |
831 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); |
832 | else if (cda[CTA_TUPLE_REPLY]) |
833 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); |
834 | else { |
835 | /* Flush the whole table */ |
836 | nf_conntrack_flush_report(net, |
837 | NETLINK_CB(skb).pid, |
838 | nlmsg_report(nlh)); |
839 | return 0; |
840 | } |
841 | |
842 | if (err < 0) |
843 | return err; |
844 | |
845 | h = nf_conntrack_find_get(net, zone, &tuple); |
846 | if (!h) |
847 | return -ENOENT; |
848 | |
849 | ct = nf_ct_tuplehash_to_ctrack(h); |
850 | |
851 | if (cda[CTA_ID]) { |
852 | u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID])); |
853 | if (id != (u32)(unsigned long)ct) { |
854 | nf_ct_put(ct); |
855 | return -ENOENT; |
856 | } |
857 | } |
858 | |
859 | if (nf_conntrack_event_report(IPCT_DESTROY, ct, |
860 | NETLINK_CB(skb).pid, |
861 | nlmsg_report(nlh)) < 0) { |
862 | nf_ct_delete_from_lists(ct); |
863 | /* we failed to report the event, try later */ |
864 | nf_ct_insert_dying_list(ct); |
865 | nf_ct_put(ct); |
866 | return 0; |
867 | } |
868 | |
869 | /* death_by_timeout would report the event again */ |
870 | set_bit(IPS_DYING_BIT, &ct->status); |
871 | |
872 | nf_ct_kill(ct); |
873 | nf_ct_put(ct); |
874 | |
875 | return 0; |
876 | } |
877 | |
878 | static int |
879 | ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, |
880 | const struct nlmsghdr *nlh, |
881 | const struct nlattr * const cda[]) |
882 | { |
883 | struct net *net = sock_net(ctnl); |
884 | struct nf_conntrack_tuple_hash *h; |
885 | struct nf_conntrack_tuple tuple; |
886 | struct nf_conn *ct; |
887 | struct sk_buff *skb2 = NULL; |
888 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
889 | u_int8_t u3 = nfmsg->nfgen_family; |
890 | u16 zone; |
891 | int err; |
892 | |
893 | if (nlh->nlmsg_flags & NLM_F_DUMP) |
894 | return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table, |
895 | ctnetlink_done); |
896 | |
897 | err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone); |
898 | if (err < 0) |
899 | return err; |
900 | |
901 | if (cda[CTA_TUPLE_ORIG]) |
902 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); |
903 | else if (cda[CTA_TUPLE_REPLY]) |
904 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); |
905 | else |
906 | return -EINVAL; |
907 | |
908 | if (err < 0) |
909 | return err; |
910 | |
911 | h = nf_conntrack_find_get(net, zone, &tuple); |
912 | if (!h) |
913 | return -ENOENT; |
914 | |
915 | ct = nf_ct_tuplehash_to_ctrack(h); |
916 | |
917 | err = -ENOMEM; |
918 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
919 | if (skb2 == NULL) { |
920 | nf_ct_put(ct); |
921 | return -ENOMEM; |
922 | } |
923 | |
924 | rcu_read_lock(); |
925 | err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, |
926 | IPCTNL_MSG_CT_NEW, ct); |
927 | rcu_read_unlock(); |
928 | nf_ct_put(ct); |
929 | if (err <= 0) |
930 | goto free; |
931 | |
932 | err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
933 | if (err < 0) |
934 | goto out; |
935 | |
936 | return 0; |
937 | |
938 | free: |
939 | kfree_skb(skb2); |
940 | out: |
941 | return err; |
942 | } |
943 | |
944 | #ifdef CONFIG_NF_NAT_NEEDED |
945 | static int |
946 | ctnetlink_parse_nat_setup(struct nf_conn *ct, |
947 | enum nf_nat_manip_type manip, |
948 | const struct nlattr *attr) |
949 | { |
950 | typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup; |
951 | |
952 | parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook); |
953 | if (!parse_nat_setup) { |
954 | #ifdef CONFIG_MODULES |
955 | rcu_read_unlock(); |
956 | spin_unlock_bh(&nf_conntrack_lock); |
957 | nfnl_unlock(); |
958 | if (request_module("nf-nat-ipv4") < 0) { |
959 | nfnl_lock(); |
960 | spin_lock_bh(&nf_conntrack_lock); |
961 | rcu_read_lock(); |
962 | return -EOPNOTSUPP; |
963 | } |
964 | nfnl_lock(); |
965 | spin_lock_bh(&nf_conntrack_lock); |
966 | rcu_read_lock(); |
967 | if (nfnetlink_parse_nat_setup_hook) |
968 | return -EAGAIN; |
969 | #endif |
970 | return -EOPNOTSUPP; |
971 | } |
972 | |
973 | return parse_nat_setup(ct, manip, attr); |
974 | } |
975 | #endif |
976 | |
977 | static int |
978 | ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[]) |
979 | { |
980 | unsigned long d; |
981 | unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS])); |
982 | d = ct->status ^ status; |
983 | |
984 | if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING)) |
985 | /* unchangeable */ |
986 | return -EBUSY; |
987 | |
988 | if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY)) |
989 | /* SEEN_REPLY bit can only be set */ |
990 | return -EBUSY; |
991 | |
992 | if (d & IPS_ASSURED && !(status & IPS_ASSURED)) |
993 | /* ASSURED bit can only be set */ |
994 | return -EBUSY; |
995 | |
996 | /* Be careful here, modifying NAT bits can screw up things, |
997 | * so don't let users modify them directly if they don't pass |
998 | * nf_nat_range. */ |
999 | ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK); |
1000 | return 0; |
1001 | } |
1002 | |
1003 | static int |
1004 | ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[]) |
1005 | { |
1006 | #ifdef CONFIG_NF_NAT_NEEDED |
1007 | int ret; |
1008 | |
1009 | if (cda[CTA_NAT_DST]) { |
1010 | ret = ctnetlink_parse_nat_setup(ct, |
1011 | IP_NAT_MANIP_DST, |
1012 | cda[CTA_NAT_DST]); |
1013 | if (ret < 0) |
1014 | return ret; |
1015 | } |
1016 | if (cda[CTA_NAT_SRC]) { |
1017 | ret = ctnetlink_parse_nat_setup(ct, |
1018 | IP_NAT_MANIP_SRC, |
1019 | cda[CTA_NAT_SRC]); |
1020 | if (ret < 0) |
1021 | return ret; |
1022 | } |
1023 | return 0; |
1024 | #else |
1025 | return -EOPNOTSUPP; |
1026 | #endif |
1027 | } |
1028 | |
1029 | static inline int |
1030 | ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[]) |
1031 | { |
1032 | struct nf_conntrack_helper *helper; |
1033 | struct nf_conn_help *help = nfct_help(ct); |
1034 | char *helpname = NULL; |
1035 | int err; |
1036 | |
1037 | /* don't change helper of sibling connections */ |
1038 | if (ct->master) |
1039 | return -EBUSY; |
1040 | |
1041 | err = ctnetlink_parse_help(cda[CTA_HELP], &helpname); |
1042 | if (err < 0) |
1043 | return err; |
1044 | |
1045 | if (!strcmp(helpname, "")) { |
1046 | if (help && help->helper) { |
1047 | /* we had a helper before ... */ |
1048 | nf_ct_remove_expectations(ct); |
1049 | rcu_assign_pointer(help->helper, NULL); |
1050 | } |
1051 | |
1052 | return 0; |
1053 | } |
1054 | |
1055 | helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct), |
1056 | nf_ct_protonum(ct)); |
1057 | if (helper == NULL) { |
1058 | #ifdef CONFIG_MODULES |
1059 | spin_unlock_bh(&nf_conntrack_lock); |
1060 | |
1061 | if (request_module("nfct-helper-%s", helpname) < 0) { |
1062 | spin_lock_bh(&nf_conntrack_lock); |
1063 | return -EOPNOTSUPP; |
1064 | } |
1065 | |
1066 | spin_lock_bh(&nf_conntrack_lock); |
1067 | helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct), |
1068 | nf_ct_protonum(ct)); |
1069 | if (helper) |
1070 | return -EAGAIN; |
1071 | #endif |
1072 | return -EOPNOTSUPP; |
1073 | } |
1074 | |
1075 | if (help) { |
1076 | if (help->helper == helper) |
1077 | return 0; |
1078 | if (help->helper) |
1079 | return -EBUSY; |
1080 | /* need to zero data of old helper */ |
1081 | memset(&help->help, 0, sizeof(help->help)); |
1082 | } else { |
1083 | /* we cannot set a helper for an existing conntrack */ |
1084 | return -EOPNOTSUPP; |
1085 | } |
1086 | |
1087 | rcu_assign_pointer(help->helper, helper); |
1088 | |
1089 | return 0; |
1090 | } |
1091 | |
1092 | static inline int |
1093 | ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[]) |
1094 | { |
1095 | u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT])); |
1096 | |
1097 | if (!del_timer(&ct->timeout)) |
1098 | return -ETIME; |
1099 | |
1100 | ct->timeout.expires = jiffies + timeout * HZ; |
1101 | add_timer(&ct->timeout); |
1102 | |
1103 | return 0; |
1104 | } |
1105 | |
1106 | static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = { |
1107 | [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED }, |
1108 | [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED }, |
1109 | [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED }, |
1110 | }; |
1111 | |
1112 | static inline int |
1113 | ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[]) |
1114 | { |
1115 | const struct nlattr *attr = cda[CTA_PROTOINFO]; |
1116 | struct nlattr *tb[CTA_PROTOINFO_MAX+1]; |
1117 | struct nf_conntrack_l4proto *l4proto; |
1118 | int err = 0; |
1119 | |
1120 | nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy); |
1121 | |
1122 | rcu_read_lock(); |
1123 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
1124 | if (l4proto->from_nlattr) |
1125 | err = l4proto->from_nlattr(tb, ct); |
1126 | rcu_read_unlock(); |
1127 | |
1128 | return err; |
1129 | } |
1130 | |
1131 | #ifdef CONFIG_NF_NAT_NEEDED |
1132 | static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = { |
1133 | [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 }, |
1134 | [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 }, |
1135 | [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 }, |
1136 | }; |
1137 | |
1138 | static inline int |
1139 | change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr) |
1140 | { |
1141 | struct nlattr *cda[CTA_NAT_SEQ_MAX+1]; |
1142 | |
1143 | nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy); |
1144 | |
1145 | if (!cda[CTA_NAT_SEQ_CORRECTION_POS]) |
1146 | return -EINVAL; |
1147 | |
1148 | natseq->correction_pos = |
1149 | ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS])); |
1150 | |
1151 | if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE]) |
1152 | return -EINVAL; |
1153 | |
1154 | natseq->offset_before = |
1155 | ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE])); |
1156 | |
1157 | if (!cda[CTA_NAT_SEQ_OFFSET_AFTER]) |
1158 | return -EINVAL; |
1159 | |
1160 | natseq->offset_after = |
1161 | ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER])); |
1162 | |
1163 | return 0; |
1164 | } |
1165 | |
1166 | static int |
1167 | ctnetlink_change_nat_seq_adj(struct nf_conn *ct, |
1168 | const struct nlattr * const cda[]) |
1169 | { |
1170 | int ret = 0; |
1171 | struct nf_conn_nat *nat = nfct_nat(ct); |
1172 | |
1173 | if (!nat) |
1174 | return 0; |
1175 | |
1176 | if (cda[CTA_NAT_SEQ_ADJ_ORIG]) { |
1177 | ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL], |
1178 | cda[CTA_NAT_SEQ_ADJ_ORIG]); |
1179 | if (ret < 0) |
1180 | return ret; |
1181 | |
1182 | ct->status |= IPS_SEQ_ADJUST; |
1183 | } |
1184 | |
1185 | if (cda[CTA_NAT_SEQ_ADJ_REPLY]) { |
1186 | ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY], |
1187 | cda[CTA_NAT_SEQ_ADJ_REPLY]); |
1188 | if (ret < 0) |
1189 | return ret; |
1190 | |
1191 | ct->status |= IPS_SEQ_ADJUST; |
1192 | } |
1193 | |
1194 | return 0; |
1195 | } |
1196 | #endif |
1197 | |
1198 | static int |
1199 | ctnetlink_change_conntrack(struct nf_conn *ct, |
1200 | const struct nlattr * const cda[]) |
1201 | { |
1202 | int err; |
1203 | |
1204 | /* only allow NAT changes and master assignation for new conntracks */ |
1205 | if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER]) |
1206 | return -EOPNOTSUPP; |
1207 | |
1208 | if (cda[CTA_HELP]) { |
1209 | err = ctnetlink_change_helper(ct, cda); |
1210 | if (err < 0) |
1211 | return err; |
1212 | } |
1213 | |
1214 | if (cda[CTA_TIMEOUT]) { |
1215 | err = ctnetlink_change_timeout(ct, cda); |
1216 | if (err < 0) |
1217 | return err; |
1218 | } |
1219 | |
1220 | if (cda[CTA_STATUS]) { |
1221 | err = ctnetlink_change_status(ct, cda); |
1222 | if (err < 0) |
1223 | return err; |
1224 | } |
1225 | |
1226 | if (cda[CTA_PROTOINFO]) { |
1227 | err = ctnetlink_change_protoinfo(ct, cda); |
1228 | if (err < 0) |
1229 | return err; |
1230 | } |
1231 | |
1232 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
1233 | if (cda[CTA_MARK]) |
1234 | ct->mark = ntohl(nla_get_be32(cda[CTA_MARK])); |
1235 | #endif |
1236 | |
1237 | #ifdef CONFIG_NF_NAT_NEEDED |
1238 | if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) { |
1239 | err = ctnetlink_change_nat_seq_adj(ct, cda); |
1240 | if (err < 0) |
1241 | return err; |
1242 | } |
1243 | #endif |
1244 | |
1245 | return 0; |
1246 | } |
1247 | |
1248 | static struct nf_conn * |
1249 | ctnetlink_create_conntrack(struct net *net, u16 zone, |
1250 | const struct nlattr * const cda[], |
1251 | struct nf_conntrack_tuple *otuple, |
1252 | struct nf_conntrack_tuple *rtuple, |
1253 | u8 u3) |
1254 | { |
1255 | struct nf_conn *ct; |
1256 | int err = -EINVAL; |
1257 | struct nf_conntrack_helper *helper; |
1258 | |
1259 | ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC); |
1260 | if (IS_ERR(ct)) |
1261 | return ERR_PTR(-ENOMEM); |
1262 | |
1263 | if (!cda[CTA_TIMEOUT]) |
1264 | goto err1; |
1265 | ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT])); |
1266 | |
1267 | ct->timeout.expires = jiffies + ct->timeout.expires * HZ; |
1268 | |
1269 | rcu_read_lock(); |
1270 | if (cda[CTA_HELP]) { |
1271 | char *helpname = NULL; |
1272 | |
1273 | err = ctnetlink_parse_help(cda[CTA_HELP], &helpname); |
1274 | if (err < 0) |
1275 | goto err2; |
1276 | |
1277 | helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct), |
1278 | nf_ct_protonum(ct)); |
1279 | if (helper == NULL) { |
1280 | rcu_read_unlock(); |
1281 | #ifdef CONFIG_MODULES |
1282 | if (request_module("nfct-helper-%s", helpname) < 0) { |
1283 | err = -EOPNOTSUPP; |
1284 | goto err1; |
1285 | } |
1286 | |
1287 | rcu_read_lock(); |
1288 | helper = __nf_conntrack_helper_find(helpname, |
1289 | nf_ct_l3num(ct), |
1290 | nf_ct_protonum(ct)); |
1291 | if (helper) { |
1292 | err = -EAGAIN; |
1293 | goto err2; |
1294 | } |
1295 | rcu_read_unlock(); |
1296 | #endif |
1297 | err = -EOPNOTSUPP; |
1298 | goto err1; |
1299 | } else { |
1300 | struct nf_conn_help *help; |
1301 | |
1302 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
1303 | if (help == NULL) { |
1304 | err = -ENOMEM; |
1305 | goto err2; |
1306 | } |
1307 | |
1308 | /* not in hash table yet so not strictly necessary */ |
1309 | rcu_assign_pointer(help->helper, helper); |
1310 | } |
1311 | } else { |
1312 | /* try an implicit helper assignation */ |
1313 | err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
1314 | if (err < 0) |
1315 | goto err2; |
1316 | } |
1317 | |
1318 | if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) { |
1319 | err = ctnetlink_change_nat(ct, cda); |
1320 | if (err < 0) |
1321 | goto err2; |
1322 | } |
1323 | |
1324 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
1325 | nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC); |
1326 | /* we must add conntrack extensions before confirmation. */ |
1327 | ct->status |= IPS_CONFIRMED; |
1328 | |
1329 | if (cda[CTA_STATUS]) { |
1330 | err = ctnetlink_change_status(ct, cda); |
1331 | if (err < 0) |
1332 | goto err2; |
1333 | } |
1334 | |
1335 | #ifdef CONFIG_NF_NAT_NEEDED |
1336 | if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) { |
1337 | err = ctnetlink_change_nat_seq_adj(ct, cda); |
1338 | if (err < 0) |
1339 | goto err2; |
1340 | } |
1341 | #endif |
1342 | |
1343 | if (cda[CTA_PROTOINFO]) { |
1344 | err = ctnetlink_change_protoinfo(ct, cda); |
1345 | if (err < 0) |
1346 | goto err2; |
1347 | } |
1348 | |
1349 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
1350 | if (cda[CTA_MARK]) |
1351 | ct->mark = ntohl(nla_get_be32(cda[CTA_MARK])); |
1352 | #endif |
1353 | |
1354 | /* setup master conntrack: this is a confirmed expectation */ |
1355 | if (cda[CTA_TUPLE_MASTER]) { |
1356 | struct nf_conntrack_tuple master; |
1357 | struct nf_conntrack_tuple_hash *master_h; |
1358 | struct nf_conn *master_ct; |
1359 | |
1360 | err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3); |
1361 | if (err < 0) |
1362 | goto err2; |
1363 | |
1364 | master_h = nf_conntrack_find_get(net, zone, &master); |
1365 | if (master_h == NULL) { |
1366 | err = -ENOENT; |
1367 | goto err2; |
1368 | } |
1369 | master_ct = nf_ct_tuplehash_to_ctrack(master_h); |
1370 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
1371 | ct->master = master_ct; |
1372 | } |
1373 | |
1374 | add_timer(&ct->timeout); |
1375 | nf_conntrack_hash_insert(ct); |
1376 | rcu_read_unlock(); |
1377 | |
1378 | return ct; |
1379 | |
1380 | err2: |
1381 | rcu_read_unlock(); |
1382 | err1: |
1383 | nf_conntrack_free(ct); |
1384 | return ERR_PTR(err); |
1385 | } |
1386 | |
1387 | static int |
1388 | ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, |
1389 | const struct nlmsghdr *nlh, |
1390 | const struct nlattr * const cda[]) |
1391 | { |
1392 | struct net *net = sock_net(ctnl); |
1393 | struct nf_conntrack_tuple otuple, rtuple; |
1394 | struct nf_conntrack_tuple_hash *h = NULL; |
1395 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
1396 | u_int8_t u3 = nfmsg->nfgen_family; |
1397 | u16 zone; |
1398 | int err; |
1399 | |
1400 | err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone); |
1401 | if (err < 0) |
1402 | return err; |
1403 | |
1404 | if (cda[CTA_TUPLE_ORIG]) { |
1405 | err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3); |
1406 | if (err < 0) |
1407 | return err; |
1408 | } |
1409 | |
1410 | if (cda[CTA_TUPLE_REPLY]) { |
1411 | err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3); |
1412 | if (err < 0) |
1413 | return err; |
1414 | } |
1415 | |
1416 | spin_lock_bh(&nf_conntrack_lock); |
1417 | if (cda[CTA_TUPLE_ORIG]) |
1418 | h = __nf_conntrack_find(net, zone, &otuple); |
1419 | else if (cda[CTA_TUPLE_REPLY]) |
1420 | h = __nf_conntrack_find(net, zone, &rtuple); |
1421 | |
1422 | if (h == NULL) { |
1423 | err = -ENOENT; |
1424 | if (nlh->nlmsg_flags & NLM_F_CREATE) { |
1425 | struct nf_conn *ct; |
1426 | enum ip_conntrack_events events; |
1427 | |
1428 | ct = ctnetlink_create_conntrack(net, zone, cda, &otuple, |
1429 | &rtuple, u3); |
1430 | if (IS_ERR(ct)) { |
1431 | err = PTR_ERR(ct); |
1432 | goto out_unlock; |
1433 | } |
1434 | err = 0; |
1435 | nf_conntrack_get(&ct->ct_general); |
1436 | spin_unlock_bh(&nf_conntrack_lock); |
1437 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) |
1438 | events = IPCT_RELATED; |
1439 | else |
1440 | events = IPCT_NEW; |
1441 | |
1442 | nf_conntrack_eventmask_report((1 << IPCT_REPLY) | |
1443 | (1 << IPCT_ASSURED) | |
1444 | (1 << IPCT_HELPER) | |
1445 | (1 << IPCT_PROTOINFO) | |
1446 | (1 << IPCT_NATSEQADJ) | |
1447 | (1 << IPCT_MARK) | events, |
1448 | ct, NETLINK_CB(skb).pid, |
1449 | nlmsg_report(nlh)); |
1450 | nf_ct_put(ct); |
1451 | } else |
1452 | spin_unlock_bh(&nf_conntrack_lock); |
1453 | |
1454 | return err; |
1455 | } |
1456 | /* implicit 'else' */ |
1457 | |
1458 | /* We manipulate the conntrack inside the global conntrack table lock, |
1459 | * so there's no need to increase the refcount */ |
1460 | err = -EEXIST; |
1461 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) { |
1462 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); |
1463 | |
1464 | err = ctnetlink_change_conntrack(ct, cda); |
1465 | if (err == 0) { |
1466 | nf_conntrack_get(&ct->ct_general); |
1467 | spin_unlock_bh(&nf_conntrack_lock); |
1468 | nf_conntrack_eventmask_report((1 << IPCT_REPLY) | |
1469 | (1 << IPCT_ASSURED) | |
1470 | (1 << IPCT_HELPER) | |
1471 | (1 << IPCT_PROTOINFO) | |
1472 | (1 << IPCT_NATSEQADJ) | |
1473 | (1 << IPCT_MARK), |
1474 | ct, NETLINK_CB(skb).pid, |
1475 | nlmsg_report(nlh)); |
1476 | nf_ct_put(ct); |
1477 | } else |
1478 | spin_unlock_bh(&nf_conntrack_lock); |
1479 | |
1480 | return err; |
1481 | } |
1482 | |
1483 | out_unlock: |
1484 | spin_unlock_bh(&nf_conntrack_lock); |
1485 | return err; |
1486 | } |
1487 | |
1488 | /*********************************************************************** |
1489 | * EXPECT |
1490 | ***********************************************************************/ |
1491 | |
1492 | static inline int |
1493 | ctnetlink_exp_dump_tuple(struct sk_buff *skb, |
1494 | const struct nf_conntrack_tuple *tuple, |
1495 | enum ctattr_expect type) |
1496 | { |
1497 | struct nlattr *nest_parms; |
1498 | |
1499 | nest_parms = nla_nest_start(skb, type | NLA_F_NESTED); |
1500 | if (!nest_parms) |
1501 | goto nla_put_failure; |
1502 | if (ctnetlink_dump_tuples(skb, tuple) < 0) |
1503 | goto nla_put_failure; |
1504 | nla_nest_end(skb, nest_parms); |
1505 | |
1506 | return 0; |
1507 | |
1508 | nla_put_failure: |
1509 | return -1; |
1510 | } |
1511 | |
1512 | static inline int |
1513 | ctnetlink_exp_dump_mask(struct sk_buff *skb, |
1514 | const struct nf_conntrack_tuple *tuple, |
1515 | const struct nf_conntrack_tuple_mask *mask) |
1516 | { |
1517 | int ret; |
1518 | struct nf_conntrack_l3proto *l3proto; |
1519 | struct nf_conntrack_l4proto *l4proto; |
1520 | struct nf_conntrack_tuple m; |
1521 | struct nlattr *nest_parms; |
1522 | |
1523 | memset(&m, 0xFF, sizeof(m)); |
1524 | memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3)); |
1525 | m.src.u.all = mask->src.u.all; |
1526 | m.dst.protonum = tuple->dst.protonum; |
1527 | |
1528 | nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED); |
1529 | if (!nest_parms) |
1530 | goto nla_put_failure; |
1531 | |
1532 | l3proto = __nf_ct_l3proto_find(tuple->src.l3num); |
1533 | ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto); |
1534 | |
1535 | if (unlikely(ret < 0)) |
1536 | goto nla_put_failure; |
1537 | |
1538 | l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum); |
1539 | ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto); |
1540 | if (unlikely(ret < 0)) |
1541 | goto nla_put_failure; |
1542 | |
1543 | nla_nest_end(skb, nest_parms); |
1544 | |
1545 | return 0; |
1546 | |
1547 | nla_put_failure: |
1548 | return -1; |
1549 | } |
1550 | |
1551 | static int |
1552 | ctnetlink_exp_dump_expect(struct sk_buff *skb, |
1553 | const struct nf_conntrack_expect *exp) |
1554 | { |
1555 | struct nf_conn *master = exp->master; |
1556 | struct nf_conntrack_helper *helper; |
1557 | long timeout = (exp->timeout.expires - jiffies) / HZ; |
1558 | |
1559 | if (timeout < 0) |
1560 | timeout = 0; |
1561 | |
1562 | if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0) |
1563 | goto nla_put_failure; |
1564 | if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0) |
1565 | goto nla_put_failure; |
1566 | if (ctnetlink_exp_dump_tuple(skb, |
1567 | &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
1568 | CTA_EXPECT_MASTER) < 0) |
1569 | goto nla_put_failure; |
1570 | |
1571 | NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)); |
1572 | NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)); |
1573 | helper = rcu_dereference(nfct_help(master)->helper); |
1574 | if (helper) |
1575 | NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name); |
1576 | |
1577 | return 0; |
1578 | |
1579 | nla_put_failure: |
1580 | return -1; |
1581 | } |
1582 | |
1583 | static int |
1584 | ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
1585 | int event, const struct nf_conntrack_expect *exp) |
1586 | { |
1587 | struct nlmsghdr *nlh; |
1588 | struct nfgenmsg *nfmsg; |
1589 | unsigned int flags = pid ? NLM_F_MULTI : 0; |
1590 | |
1591 | event |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
1592 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags); |
1593 | if (nlh == NULL) |
1594 | goto nlmsg_failure; |
1595 | |
1596 | nfmsg = nlmsg_data(nlh); |
1597 | nfmsg->nfgen_family = exp->tuple.src.l3num; |
1598 | nfmsg->version = NFNETLINK_V0; |
1599 | nfmsg->res_id = 0; |
1600 | |
1601 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) |
1602 | goto nla_put_failure; |
1603 | |
1604 | nlmsg_end(skb, nlh); |
1605 | return skb->len; |
1606 | |
1607 | nlmsg_failure: |
1608 | nla_put_failure: |
1609 | nlmsg_cancel(skb, nlh); |
1610 | return -1; |
1611 | } |
1612 | |
1613 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
1614 | static int |
1615 | ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item) |
1616 | { |
1617 | struct nf_conntrack_expect *exp = item->exp; |
1618 | struct net *net = nf_ct_exp_net(exp); |
1619 | struct nlmsghdr *nlh; |
1620 | struct nfgenmsg *nfmsg; |
1621 | struct sk_buff *skb; |
1622 | unsigned int type; |
1623 | int flags = 0; |
1624 | |
1625 | if (events & (1 << IPEXP_NEW)) { |
1626 | type = IPCTNL_MSG_EXP_NEW; |
1627 | flags = NLM_F_CREATE|NLM_F_EXCL; |
1628 | } else |
1629 | return 0; |
1630 | |
1631 | if (!item->report && |
1632 | !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW)) |
1633 | return 0; |
1634 | |
1635 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
1636 | if (skb == NULL) |
1637 | goto errout; |
1638 | |
1639 | type |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
1640 | nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags); |
1641 | if (nlh == NULL) |
1642 | goto nlmsg_failure; |
1643 | |
1644 | nfmsg = nlmsg_data(nlh); |
1645 | nfmsg->nfgen_family = exp->tuple.src.l3num; |
1646 | nfmsg->version = NFNETLINK_V0; |
1647 | nfmsg->res_id = 0; |
1648 | |
1649 | rcu_read_lock(); |
1650 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) |
1651 | goto nla_put_failure; |
1652 | rcu_read_unlock(); |
1653 | |
1654 | nlmsg_end(skb, nlh); |
1655 | nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW, |
1656 | item->report, GFP_ATOMIC); |
1657 | return 0; |
1658 | |
1659 | nla_put_failure: |
1660 | rcu_read_unlock(); |
1661 | nlmsg_cancel(skb, nlh); |
1662 | nlmsg_failure: |
1663 | kfree_skb(skb); |
1664 | errout: |
1665 | nfnetlink_set_err(net, 0, 0, -ENOBUFS); |
1666 | return 0; |
1667 | } |
1668 | #endif |
1669 | static int ctnetlink_exp_done(struct netlink_callback *cb) |
1670 | { |
1671 | if (cb->args[1]) |
1672 | nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]); |
1673 | return 0; |
1674 | } |
1675 | |
1676 | static int |
1677 | ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
1678 | { |
1679 | struct net *net = sock_net(skb->sk); |
1680 | struct nf_conntrack_expect *exp, *last; |
1681 | struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
1682 | struct hlist_node *n; |
1683 | u_int8_t l3proto = nfmsg->nfgen_family; |
1684 | |
1685 | rcu_read_lock(); |
1686 | last = (struct nf_conntrack_expect *)cb->args[1]; |
1687 | for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) { |
1688 | restart: |
1689 | hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]], |
1690 | hnode) { |
1691 | if (l3proto && exp->tuple.src.l3num != l3proto) |
1692 | continue; |
1693 | if (cb->args[1]) { |
1694 | if (exp != last) |
1695 | continue; |
1696 | cb->args[1] = 0; |
1697 | } |
1698 | if (ctnetlink_exp_fill_info(skb, |
1699 | NETLINK_CB(cb->skb).pid, |
1700 | cb->nlh->nlmsg_seq, |
1701 | IPCTNL_MSG_EXP_NEW, |
1702 | exp) < 0) { |
1703 | if (!atomic_inc_not_zero(&exp->use)) |
1704 | continue; |
1705 | cb->args[1] = (unsigned long)exp; |
1706 | goto out; |
1707 | } |
1708 | } |
1709 | if (cb->args[1]) { |
1710 | cb->args[1] = 0; |
1711 | goto restart; |
1712 | } |
1713 | } |
1714 | out: |
1715 | rcu_read_unlock(); |
1716 | if (last) |
1717 | nf_ct_expect_put(last); |
1718 | |
1719 | return skb->len; |
1720 | } |
1721 | |
1722 | static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = { |
1723 | [CTA_EXPECT_MASTER] = { .type = NLA_NESTED }, |
1724 | [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED }, |
1725 | [CTA_EXPECT_MASK] = { .type = NLA_NESTED }, |
1726 | [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 }, |
1727 | [CTA_EXPECT_ID] = { .type = NLA_U32 }, |
1728 | [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING }, |
1729 | }; |
1730 | |
1731 | static int |
1732 | ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, |
1733 | const struct nlmsghdr *nlh, |
1734 | const struct nlattr * const cda[]) |
1735 | { |
1736 | struct net *net = sock_net(ctnl); |
1737 | struct nf_conntrack_tuple tuple; |
1738 | struct nf_conntrack_expect *exp; |
1739 | struct sk_buff *skb2; |
1740 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
1741 | u_int8_t u3 = nfmsg->nfgen_family; |
1742 | u16 zone; |
1743 | int err; |
1744 | |
1745 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
1746 | return netlink_dump_start(ctnl, skb, nlh, |
1747 | ctnetlink_exp_dump_table, |
1748 | ctnetlink_exp_done); |
1749 | } |
1750 | |
1751 | err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone); |
1752 | if (err < 0) |
1753 | return err; |
1754 | |
1755 | if (cda[CTA_EXPECT_MASTER]) |
1756 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3); |
1757 | else |
1758 | return -EINVAL; |
1759 | |
1760 | if (err < 0) |
1761 | return err; |
1762 | |
1763 | exp = nf_ct_expect_find_get(net, zone, &tuple); |
1764 | if (!exp) |
1765 | return -ENOENT; |
1766 | |
1767 | if (cda[CTA_EXPECT_ID]) { |
1768 | __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]); |
1769 | if (ntohl(id) != (u32)(unsigned long)exp) { |
1770 | nf_ct_expect_put(exp); |
1771 | return -ENOENT; |
1772 | } |
1773 | } |
1774 | |
1775 | err = -ENOMEM; |
1776 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
1777 | if (skb2 == NULL) |
1778 | goto out; |
1779 | |
1780 | rcu_read_lock(); |
1781 | err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid, |
1782 | nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp); |
1783 | rcu_read_unlock(); |
1784 | if (err <= 0) |
1785 | goto free; |
1786 | |
1787 | nf_ct_expect_put(exp); |
1788 | |
1789 | return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
1790 | |
1791 | free: |
1792 | kfree_skb(skb2); |
1793 | out: |
1794 | nf_ct_expect_put(exp); |
1795 | return err; |
1796 | } |
1797 | |
1798 | static int |
1799 | ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb, |
1800 | const struct nlmsghdr *nlh, |
1801 | const struct nlattr * const cda[]) |
1802 | { |
1803 | struct net *net = sock_net(ctnl); |
1804 | struct nf_conntrack_expect *exp; |
1805 | struct nf_conntrack_tuple tuple; |
1806 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
1807 | struct hlist_node *n, *next; |
1808 | u_int8_t u3 = nfmsg->nfgen_family; |
1809 | unsigned int i; |
1810 | u16 zone; |
1811 | int err; |
1812 | |
1813 | if (cda[CTA_EXPECT_TUPLE]) { |
1814 | /* delete a single expect by tuple */ |
1815 | err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone); |
1816 | if (err < 0) |
1817 | return err; |
1818 | |
1819 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
1820 | if (err < 0) |
1821 | return err; |
1822 | |
1823 | /* bump usage count to 2 */ |
1824 | exp = nf_ct_expect_find_get(net, zone, &tuple); |
1825 | if (!exp) |
1826 | return -ENOENT; |
1827 | |
1828 | if (cda[CTA_EXPECT_ID]) { |
1829 | __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]); |
1830 | if (ntohl(id) != (u32)(unsigned long)exp) { |
1831 | nf_ct_expect_put(exp); |
1832 | return -ENOENT; |
1833 | } |
1834 | } |
1835 | |
1836 | /* after list removal, usage count == 1 */ |
1837 | nf_ct_unexpect_related(exp); |
1838 | /* have to put what we 'get' above. |
1839 | * after this line usage count == 0 */ |
1840 | nf_ct_expect_put(exp); |
1841 | } else if (cda[CTA_EXPECT_HELP_NAME]) { |
1842 | char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]); |
1843 | struct nf_conn_help *m_help; |
1844 | |
1845 | /* delete all expectations for this helper */ |
1846 | spin_lock_bh(&nf_conntrack_lock); |
1847 | for (i = 0; i < nf_ct_expect_hsize; i++) { |
1848 | hlist_for_each_entry_safe(exp, n, next, |
1849 | &net->ct.expect_hash[i], |
1850 | hnode) { |
1851 | m_help = nfct_help(exp->master); |
1852 | if (!strcmp(m_help->helper->name, name) && |
1853 | del_timer(&exp->timeout)) { |
1854 | nf_ct_unlink_expect(exp); |
1855 | nf_ct_expect_put(exp); |
1856 | } |
1857 | } |
1858 | } |
1859 | spin_unlock_bh(&nf_conntrack_lock); |
1860 | } else { |
1861 | /* This basically means we have to flush everything*/ |
1862 | spin_lock_bh(&nf_conntrack_lock); |
1863 | for (i = 0; i < nf_ct_expect_hsize; i++) { |
1864 | hlist_for_each_entry_safe(exp, n, next, |
1865 | &net->ct.expect_hash[i], |
1866 | hnode) { |
1867 | if (del_timer(&exp->timeout)) { |
1868 | nf_ct_unlink_expect(exp); |
1869 | nf_ct_expect_put(exp); |
1870 | } |
1871 | } |
1872 | } |
1873 | spin_unlock_bh(&nf_conntrack_lock); |
1874 | } |
1875 | |
1876 | return 0; |
1877 | } |
1878 | static int |
1879 | ctnetlink_change_expect(struct nf_conntrack_expect *x, |
1880 | const struct nlattr * const cda[]) |
1881 | { |
1882 | return -EOPNOTSUPP; |
1883 | } |
1884 | |
1885 | static int |
1886 | ctnetlink_create_expect(struct net *net, u16 zone, |
1887 | const struct nlattr * const cda[], |
1888 | u_int8_t u3, |
1889 | u32 pid, int report) |
1890 | { |
1891 | struct nf_conntrack_tuple tuple, mask, master_tuple; |
1892 | struct nf_conntrack_tuple_hash *h = NULL; |
1893 | struct nf_conntrack_expect *exp; |
1894 | struct nf_conn *ct; |
1895 | struct nf_conn_help *help; |
1896 | int err = 0; |
1897 | |
1898 | /* caller guarantees that those three CTA_EXPECT_* exist */ |
1899 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
1900 | if (err < 0) |
1901 | return err; |
1902 | err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3); |
1903 | if (err < 0) |
1904 | return err; |
1905 | err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3); |
1906 | if (err < 0) |
1907 | return err; |
1908 | |
1909 | /* Look for master conntrack of this expectation */ |
1910 | h = nf_conntrack_find_get(net, zone, &master_tuple); |
1911 | if (!h) |
1912 | return -ENOENT; |
1913 | ct = nf_ct_tuplehash_to_ctrack(h); |
1914 | help = nfct_help(ct); |
1915 | |
1916 | if (!help || !help->helper) { |
1917 | /* such conntrack hasn't got any helper, abort */ |
1918 | err = -EOPNOTSUPP; |
1919 | goto out; |
1920 | } |
1921 | |
1922 | exp = nf_ct_expect_alloc(ct); |
1923 | if (!exp) { |
1924 | err = -ENOMEM; |
1925 | goto out; |
1926 | } |
1927 | |
1928 | exp->class = 0; |
1929 | exp->expectfn = NULL; |
1930 | exp->flags = 0; |
1931 | exp->master = ct; |
1932 | exp->helper = NULL; |
1933 | memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple)); |
1934 | memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3)); |
1935 | exp->mask.src.u.all = mask.src.u.all; |
1936 | |
1937 | err = nf_ct_expect_related_report(exp, pid, report); |
1938 | nf_ct_expect_put(exp); |
1939 | |
1940 | out: |
1941 | nf_ct_put(nf_ct_tuplehash_to_ctrack(h)); |
1942 | return err; |
1943 | } |
1944 | |
1945 | static int |
1946 | ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb, |
1947 | const struct nlmsghdr *nlh, |
1948 | const struct nlattr * const cda[]) |
1949 | { |
1950 | struct net *net = sock_net(ctnl); |
1951 | struct nf_conntrack_tuple tuple; |
1952 | struct nf_conntrack_expect *exp; |
1953 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
1954 | u_int8_t u3 = nfmsg->nfgen_family; |
1955 | u16 zone; |
1956 | int err; |
1957 | |
1958 | if (!cda[CTA_EXPECT_TUPLE] |
1959 | || !cda[CTA_EXPECT_MASK] |
1960 | || !cda[CTA_EXPECT_MASTER]) |
1961 | return -EINVAL; |
1962 | |
1963 | err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone); |
1964 | if (err < 0) |
1965 | return err; |
1966 | |
1967 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
1968 | if (err < 0) |
1969 | return err; |
1970 | |
1971 | spin_lock_bh(&nf_conntrack_lock); |
1972 | exp = __nf_ct_expect_find(net, zone, &tuple); |
1973 | |
1974 | if (!exp) { |
1975 | spin_unlock_bh(&nf_conntrack_lock); |
1976 | err = -ENOENT; |
1977 | if (nlh->nlmsg_flags & NLM_F_CREATE) { |
1978 | err = ctnetlink_create_expect(net, zone, cda, |
1979 | u3, |
1980 | NETLINK_CB(skb).pid, |
1981 | nlmsg_report(nlh)); |
1982 | } |
1983 | return err; |
1984 | } |
1985 | |
1986 | err = -EEXIST; |
1987 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) |
1988 | err = ctnetlink_change_expect(exp, cda); |
1989 | spin_unlock_bh(&nf_conntrack_lock); |
1990 | |
1991 | return err; |
1992 | } |
1993 | |
1994 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
1995 | static struct nf_ct_event_notifier ctnl_notifier = { |
1996 | .fcn = ctnetlink_conntrack_event, |
1997 | }; |
1998 | |
1999 | static struct nf_exp_event_notifier ctnl_notifier_exp = { |
2000 | .fcn = ctnetlink_expect_event, |
2001 | }; |
2002 | #endif |
2003 | |
2004 | static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = { |
2005 | [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack, |
2006 | .attr_count = CTA_MAX, |
2007 | .policy = ct_nla_policy }, |
2008 | [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack, |
2009 | .attr_count = CTA_MAX, |
2010 | .policy = ct_nla_policy }, |
2011 | [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack, |
2012 | .attr_count = CTA_MAX, |
2013 | .policy = ct_nla_policy }, |
2014 | [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack, |
2015 | .attr_count = CTA_MAX, |
2016 | .policy = ct_nla_policy }, |
2017 | }; |
2018 | |
2019 | static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = { |
2020 | [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect, |
2021 | .attr_count = CTA_EXPECT_MAX, |
2022 | .policy = exp_nla_policy }, |
2023 | [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect, |
2024 | .attr_count = CTA_EXPECT_MAX, |
2025 | .policy = exp_nla_policy }, |
2026 | [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect, |
2027 | .attr_count = CTA_EXPECT_MAX, |
2028 | .policy = exp_nla_policy }, |
2029 | }; |
2030 | |
2031 | static const struct nfnetlink_subsystem ctnl_subsys = { |
2032 | .name = "conntrack", |
2033 | .subsys_id = NFNL_SUBSYS_CTNETLINK, |
2034 | .cb_count = IPCTNL_MSG_MAX, |
2035 | .cb = ctnl_cb, |
2036 | }; |
2037 | |
2038 | static const struct nfnetlink_subsystem ctnl_exp_subsys = { |
2039 | .name = "conntrack_expect", |
2040 | .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP, |
2041 | .cb_count = IPCTNL_MSG_EXP_MAX, |
2042 | .cb = ctnl_exp_cb, |
2043 | }; |
2044 | |
2045 | MODULE_ALIAS("ip_conntrack_netlink"); |
2046 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK); |
2047 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP); |
2048 | |
2049 | static int __init ctnetlink_init(void) |
2050 | { |
2051 | int ret; |
2052 | |
2053 | printk("ctnetlink v%s: registering with nfnetlink.\n", version); |
2054 | ret = nfnetlink_subsys_register(&ctnl_subsys); |
2055 | if (ret < 0) { |
2056 | printk("ctnetlink_init: cannot register with nfnetlink.\n"); |
2057 | goto err_out; |
2058 | } |
2059 | |
2060 | ret = nfnetlink_subsys_register(&ctnl_exp_subsys); |
2061 | if (ret < 0) { |
2062 | printk("ctnetlink_init: cannot register exp with nfnetlink.\n"); |
2063 | goto err_unreg_subsys; |
2064 | } |
2065 | |
2066 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
2067 | ret = nf_conntrack_register_notifier(&ctnl_notifier); |
2068 | if (ret < 0) { |
2069 | printk("ctnetlink_init: cannot register notifier.\n"); |
2070 | goto err_unreg_exp_subsys; |
2071 | } |
2072 | |
2073 | ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp); |
2074 | if (ret < 0) { |
2075 | printk("ctnetlink_init: cannot expect register notifier.\n"); |
2076 | goto err_unreg_notifier; |
2077 | } |
2078 | #endif |
2079 | |
2080 | return 0; |
2081 | |
2082 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
2083 | err_unreg_notifier: |
2084 | nf_conntrack_unregister_notifier(&ctnl_notifier); |
2085 | err_unreg_exp_subsys: |
2086 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); |
2087 | #endif |
2088 | err_unreg_subsys: |
2089 | nfnetlink_subsys_unregister(&ctnl_subsys); |
2090 | err_out: |
2091 | return ret; |
2092 | } |
2093 | |
2094 | static void __exit ctnetlink_exit(void) |
2095 | { |
2096 | printk("ctnetlink: unregistering from nfnetlink.\n"); |
2097 | |
2098 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
2099 | nf_ct_expect_unregister_notifier(&ctnl_notifier_exp); |
2100 | nf_conntrack_unregister_notifier(&ctnl_notifier); |
2101 | #endif |
2102 | |
2103 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); |
2104 | nfnetlink_subsys_unregister(&ctnl_subsys); |
2105 | return; |
2106 | } |
2107 | |
2108 | module_init(ctnetlink_init); |
2109 | module_exit(ctnetlink_exit); |
2110 |
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