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atl1: fix oops when changing tx/rx ring params
[deliverable/linux.git] / net / netfilter / nf_conntrack_netlink.c
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/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
35 #include <net/sock.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_l3proto.h>
41 #include <net/netfilter/nf_conntrack_l4proto.h>
42 #include <net/netfilter/nf_conntrack_tuple.h>
43 #include <net/netfilter/nf_conntrack_acct.h>
44 #include <net/netfilter/nf_conntrack_zones.h>
45 #ifdef CONFIG_NF_NAT_NEEDED
46 #include <net/netfilter/nf_nat_core.h>
47 #include <net/netfilter/nf_nat_protocol.h>
48 #endif
49
50 #include <linux/netfilter/nfnetlink.h>
51 #include <linux/netfilter/nfnetlink_conntrack.h>
52
53 MODULE_LICENSE("GPL");
54
55 static char __initdata version[] = "0.93";
56
57 static inline int
58 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
59 const struct nf_conntrack_tuple *tuple,
60 struct nf_conntrack_l4proto *l4proto)
61 {
62 int ret = 0;
63 struct nlattr *nest_parms;
64
65 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
66 if (!nest_parms)
67 goto nla_put_failure;
68 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
69
70 if (likely(l4proto->tuple_to_nlattr))
71 ret = l4proto->tuple_to_nlattr(skb, tuple);
72
73 nla_nest_end(skb, nest_parms);
74
75 return ret;
76
77 nla_put_failure:
78 return -1;
79 }
80
81 static inline int
82 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
83 const struct nf_conntrack_tuple *tuple,
84 struct nf_conntrack_l3proto *l3proto)
85 {
86 int ret = 0;
87 struct nlattr *nest_parms;
88
89 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
90 if (!nest_parms)
91 goto nla_put_failure;
92
93 if (likely(l3proto->tuple_to_nlattr))
94 ret = l3proto->tuple_to_nlattr(skb, tuple);
95
96 nla_nest_end(skb, nest_parms);
97
98 return ret;
99
100 nla_put_failure:
101 return -1;
102 }
103
104 static int
105 ctnetlink_dump_tuples(struct sk_buff *skb,
106 const struct nf_conntrack_tuple *tuple)
107 {
108 int ret;
109 struct nf_conntrack_l3proto *l3proto;
110 struct nf_conntrack_l4proto *l4proto;
111
112 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
113 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
114
115 if (unlikely(ret < 0))
116 return ret;
117
118 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
119 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
120
121 return ret;
122 }
123
124 static inline int
125 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
126 {
127 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
128 return 0;
129
130 nla_put_failure:
131 return -1;
132 }
133
134 static inline int
135 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
136 {
137 long timeout = (ct->timeout.expires - jiffies) / HZ;
138
139 if (timeout < 0)
140 timeout = 0;
141
142 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
143 return 0;
144
145 nla_put_failure:
146 return -1;
147 }
148
149 static inline int
150 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
151 {
152 struct nf_conntrack_l4proto *l4proto;
153 struct nlattr *nest_proto;
154 int ret;
155
156 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
157 if (!l4proto->to_nlattr)
158 return 0;
159
160 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
161 if (!nest_proto)
162 goto nla_put_failure;
163
164 ret = l4proto->to_nlattr(skb, nest_proto, ct);
165
166 nla_nest_end(skb, nest_proto);
167
168 return ret;
169
170 nla_put_failure:
171 return -1;
172 }
173
174 static inline int
175 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
176 {
177 struct nlattr *nest_helper;
178 const struct nf_conn_help *help = nfct_help(ct);
179 struct nf_conntrack_helper *helper;
180
181 if (!help)
182 return 0;
183
184 helper = rcu_dereference(help->helper);
185 if (!helper)
186 goto out;
187
188 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
189 if (!nest_helper)
190 goto nla_put_failure;
191 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
192
193 if (helper->to_nlattr)
194 helper->to_nlattr(skb, ct);
195
196 nla_nest_end(skb, nest_helper);
197 out:
198 return 0;
199
200 nla_put_failure:
201 return -1;
202 }
203
204 static int
205 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
206 enum ip_conntrack_dir dir)
207 {
208 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
209 struct nlattr *nest_count;
210 const struct nf_conn_counter *acct;
211
212 acct = nf_conn_acct_find(ct);
213 if (!acct)
214 return 0;
215
216 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
217 if (!nest_count)
218 goto nla_put_failure;
219
220 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
221 cpu_to_be64(acct[dir].packets));
222 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
223 cpu_to_be64(acct[dir].bytes));
224
225 nla_nest_end(skb, nest_count);
226
227 return 0;
228
229 nla_put_failure:
230 return -1;
231 }
232
233 #ifdef CONFIG_NF_CONNTRACK_MARK
234 static inline int
235 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
236 {
237 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
238 return 0;
239
240 nla_put_failure:
241 return -1;
242 }
243 #else
244 #define ctnetlink_dump_mark(a, b) (0)
245 #endif
246
247 #ifdef CONFIG_NF_CONNTRACK_SECMARK
248 static inline int
249 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
250 {
251 struct nlattr *nest_secctx;
252 int len, ret;
253 char *secctx;
254
255 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
256 if (ret)
257 return ret;
258
259 ret = -1;
260 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
261 if (!nest_secctx)
262 goto nla_put_failure;
263
264 NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
265 nla_nest_end(skb, nest_secctx);
266
267 ret = 0;
268 nla_put_failure:
269 security_release_secctx(secctx, len);
270 return ret;
271 }
272 #else
273 #define ctnetlink_dump_secctx(a, b) (0)
274 #endif
275
276 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
277
278 static inline int
279 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
280 {
281 struct nlattr *nest_parms;
282
283 if (!(ct->status & IPS_EXPECTED))
284 return 0;
285
286 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
287 if (!nest_parms)
288 goto nla_put_failure;
289 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
290 goto nla_put_failure;
291 nla_nest_end(skb, nest_parms);
292
293 return 0;
294
295 nla_put_failure:
296 return -1;
297 }
298
299 #ifdef CONFIG_NF_NAT_NEEDED
300 static int
301 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
302 {
303 struct nlattr *nest_parms;
304
305 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
306 if (!nest_parms)
307 goto nla_put_failure;
308
309 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
310 htonl(natseq->correction_pos));
311 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
312 htonl(natseq->offset_before));
313 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
314 htonl(natseq->offset_after));
315
316 nla_nest_end(skb, nest_parms);
317
318 return 0;
319
320 nla_put_failure:
321 return -1;
322 }
323
324 static inline int
325 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
326 {
327 struct nf_nat_seq *natseq;
328 struct nf_conn_nat *nat = nfct_nat(ct);
329
330 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
331 return 0;
332
333 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
334 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
335 return -1;
336
337 natseq = &nat->seq[IP_CT_DIR_REPLY];
338 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
339 return -1;
340
341 return 0;
342 }
343 #else
344 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
345 #endif
346
347 static inline int
348 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
349 {
350 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
351 return 0;
352
353 nla_put_failure:
354 return -1;
355 }
356
357 static inline int
358 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
359 {
360 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
361 return 0;
362
363 nla_put_failure:
364 return -1;
365 }
366
367 static int
368 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
369 int event, struct nf_conn *ct)
370 {
371 struct nlmsghdr *nlh;
372 struct nfgenmsg *nfmsg;
373 struct nlattr *nest_parms;
374 unsigned int flags = pid ? NLM_F_MULTI : 0;
375
376 event |= NFNL_SUBSYS_CTNETLINK << 8;
377 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
378 if (nlh == NULL)
379 goto nlmsg_failure;
380
381 nfmsg = nlmsg_data(nlh);
382 nfmsg->nfgen_family = nf_ct_l3num(ct);
383 nfmsg->version = NFNETLINK_V0;
384 nfmsg->res_id = 0;
385
386 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
387 if (!nest_parms)
388 goto nla_put_failure;
389 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
390 goto nla_put_failure;
391 nla_nest_end(skb, nest_parms);
392
393 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
394 if (!nest_parms)
395 goto nla_put_failure;
396 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
397 goto nla_put_failure;
398 nla_nest_end(skb, nest_parms);
399
400 if (nf_ct_zone(ct))
401 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
402
403 if (ctnetlink_dump_status(skb, ct) < 0 ||
404 ctnetlink_dump_timeout(skb, ct) < 0 ||
405 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
406 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
407 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
408 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
409 ctnetlink_dump_mark(skb, ct) < 0 ||
410 ctnetlink_dump_secctx(skb, ct) < 0 ||
411 ctnetlink_dump_id(skb, ct) < 0 ||
412 ctnetlink_dump_use(skb, ct) < 0 ||
413 ctnetlink_dump_master(skb, ct) < 0 ||
414 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
415 goto nla_put_failure;
416
417 nlmsg_end(skb, nlh);
418 return skb->len;
419
420 nlmsg_failure:
421 nla_put_failure:
422 nlmsg_cancel(skb, nlh);
423 return -1;
424 }
425
426 #ifdef CONFIG_NF_CONNTRACK_EVENTS
427 static inline size_t
428 ctnetlink_proto_size(const struct nf_conn *ct)
429 {
430 struct nf_conntrack_l3proto *l3proto;
431 struct nf_conntrack_l4proto *l4proto;
432 size_t len = 0;
433
434 rcu_read_lock();
435 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
436 len += l3proto->nla_size;
437
438 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
439 len += l4proto->nla_size;
440 rcu_read_unlock();
441
442 return len;
443 }
444
445 static inline size_t
446 ctnetlink_counters_size(const struct nf_conn *ct)
447 {
448 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
449 return 0;
450 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
451 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
452 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
453 ;
454 }
455
456 #ifdef CONFIG_NF_CONNTRACK_SECMARK
457 static int ctnetlink_nlmsg_secctx_size(const struct nf_conn *ct)
458 {
459 int len;
460
461 security_secid_to_secctx(ct->secmark, NULL, &len);
462
463 return sizeof(char) * len;
464 }
465 #endif
466
467 static inline size_t
468 ctnetlink_nlmsg_size(const struct nf_conn *ct)
469 {
470 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
471 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
472 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
473 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
474 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
475 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
476 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
477 + ctnetlink_counters_size(ct)
478 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
479 + nla_total_size(0) /* CTA_PROTOINFO */
480 + nla_total_size(0) /* CTA_HELP */
481 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
482 #ifdef CONFIG_NF_CONNTRACK_SECMARK
483 + nla_total_size(0) /* CTA_SECCTX */
484 + nla_total_size(ctnetlink_nlmsg_secctx_size(ct)) /* CTA_SECCTX_NAME */
485 #endif
486 #ifdef CONFIG_NF_NAT_NEEDED
487 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
488 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
489 #endif
490 #ifdef CONFIG_NF_CONNTRACK_MARK
491 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
492 #endif
493 + ctnetlink_proto_size(ct)
494 ;
495 }
496
497 static int
498 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
499 {
500 struct net *net;
501 struct nlmsghdr *nlh;
502 struct nfgenmsg *nfmsg;
503 struct nlattr *nest_parms;
504 struct nf_conn *ct = item->ct;
505 struct sk_buff *skb;
506 unsigned int type;
507 unsigned int flags = 0, group;
508 int err;
509
510 /* ignore our fake conntrack entry */
511 if (nf_ct_is_untracked(ct))
512 return 0;
513
514 if (events & (1 << IPCT_DESTROY)) {
515 type = IPCTNL_MSG_CT_DELETE;
516 group = NFNLGRP_CONNTRACK_DESTROY;
517 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
518 type = IPCTNL_MSG_CT_NEW;
519 flags = NLM_F_CREATE|NLM_F_EXCL;
520 group = NFNLGRP_CONNTRACK_NEW;
521 } else if (events) {
522 type = IPCTNL_MSG_CT_NEW;
523 group = NFNLGRP_CONNTRACK_UPDATE;
524 } else
525 return 0;
526
527 net = nf_ct_net(ct);
528 if (!item->report && !nfnetlink_has_listeners(net, group))
529 return 0;
530
531 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
532 if (skb == NULL)
533 goto errout;
534
535 type |= NFNL_SUBSYS_CTNETLINK << 8;
536 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
537 if (nlh == NULL)
538 goto nlmsg_failure;
539
540 nfmsg = nlmsg_data(nlh);
541 nfmsg->nfgen_family = nf_ct_l3num(ct);
542 nfmsg->version = NFNETLINK_V0;
543 nfmsg->res_id = 0;
544
545 rcu_read_lock();
546 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
547 if (!nest_parms)
548 goto nla_put_failure;
549 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
550 goto nla_put_failure;
551 nla_nest_end(skb, nest_parms);
552
553 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
554 if (!nest_parms)
555 goto nla_put_failure;
556 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
557 goto nla_put_failure;
558 nla_nest_end(skb, nest_parms);
559
560 if (nf_ct_zone(ct))
561 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
562
563 if (ctnetlink_dump_id(skb, ct) < 0)
564 goto nla_put_failure;
565
566 if (ctnetlink_dump_status(skb, ct) < 0)
567 goto nla_put_failure;
568
569 if (events & (1 << IPCT_DESTROY)) {
570 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
571 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
572 goto nla_put_failure;
573 } else {
574 if (ctnetlink_dump_timeout(skb, ct) < 0)
575 goto nla_put_failure;
576
577 if (events & (1 << IPCT_PROTOINFO)
578 && ctnetlink_dump_protoinfo(skb, ct) < 0)
579 goto nla_put_failure;
580
581 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
582 && ctnetlink_dump_helpinfo(skb, ct) < 0)
583 goto nla_put_failure;
584
585 #ifdef CONFIG_NF_CONNTRACK_SECMARK
586 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
587 && ctnetlink_dump_secctx(skb, ct) < 0)
588 goto nla_put_failure;
589 #endif
590
591 if (events & (1 << IPCT_RELATED) &&
592 ctnetlink_dump_master(skb, ct) < 0)
593 goto nla_put_failure;
594
595 if (events & (1 << IPCT_NATSEQADJ) &&
596 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
597 goto nla_put_failure;
598 }
599
600 #ifdef CONFIG_NF_CONNTRACK_MARK
601 if ((events & (1 << IPCT_MARK) || ct->mark)
602 && ctnetlink_dump_mark(skb, ct) < 0)
603 goto nla_put_failure;
604 #endif
605 rcu_read_unlock();
606
607 nlmsg_end(skb, nlh);
608 err = nfnetlink_send(skb, net, item->pid, group, item->report,
609 GFP_ATOMIC);
610 if (err == -ENOBUFS || err == -EAGAIN)
611 return -ENOBUFS;
612
613 return 0;
614
615 nla_put_failure:
616 rcu_read_unlock();
617 nlmsg_cancel(skb, nlh);
618 nlmsg_failure:
619 kfree_skb(skb);
620 errout:
621 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
622 return -ENOBUFS;
623
624 return 0;
625 }
626 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
627
628 static int ctnetlink_done(struct netlink_callback *cb)
629 {
630 if (cb->args[1])
631 nf_ct_put((struct nf_conn *)cb->args[1]);
632 return 0;
633 }
634
635 static int
636 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
637 {
638 struct net *net = sock_net(skb->sk);
639 struct nf_conn *ct, *last;
640 struct nf_conntrack_tuple_hash *h;
641 struct hlist_nulls_node *n;
642 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
643 u_int8_t l3proto = nfmsg->nfgen_family;
644
645 rcu_read_lock();
646 last = (struct nf_conn *)cb->args[1];
647 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
648 restart:
649 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
650 hnnode) {
651 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
652 continue;
653 ct = nf_ct_tuplehash_to_ctrack(h);
654 if (!atomic_inc_not_zero(&ct->ct_general.use))
655 continue;
656 /* Dump entries of a given L3 protocol number.
657 * If it is not specified, ie. l3proto == 0,
658 * then dump everything. */
659 if (l3proto && nf_ct_l3num(ct) != l3proto)
660 goto releasect;
661 if (cb->args[1]) {
662 if (ct != last)
663 goto releasect;
664 cb->args[1] = 0;
665 }
666 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
667 cb->nlh->nlmsg_seq,
668 IPCTNL_MSG_CT_NEW, ct) < 0) {
669 cb->args[1] = (unsigned long)ct;
670 goto out;
671 }
672
673 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
674 IPCTNL_MSG_CT_GET_CTRZERO) {
675 struct nf_conn_counter *acct;
676
677 acct = nf_conn_acct_find(ct);
678 if (acct)
679 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
680 }
681 releasect:
682 nf_ct_put(ct);
683 }
684 if (cb->args[1]) {
685 cb->args[1] = 0;
686 goto restart;
687 }
688 }
689 out:
690 rcu_read_unlock();
691 if (last)
692 nf_ct_put(last);
693
694 return skb->len;
695 }
696
697 static inline int
698 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
699 {
700 struct nlattr *tb[CTA_IP_MAX+1];
701 struct nf_conntrack_l3proto *l3proto;
702 int ret = 0;
703
704 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
705
706 rcu_read_lock();
707 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
708
709 if (likely(l3proto->nlattr_to_tuple)) {
710 ret = nla_validate_nested(attr, CTA_IP_MAX,
711 l3proto->nla_policy);
712 if (ret == 0)
713 ret = l3proto->nlattr_to_tuple(tb, tuple);
714 }
715
716 rcu_read_unlock();
717
718 return ret;
719 }
720
721 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
722 [CTA_PROTO_NUM] = { .type = NLA_U8 },
723 };
724
725 static inline int
726 ctnetlink_parse_tuple_proto(struct nlattr *attr,
727 struct nf_conntrack_tuple *tuple)
728 {
729 struct nlattr *tb[CTA_PROTO_MAX+1];
730 struct nf_conntrack_l4proto *l4proto;
731 int ret = 0;
732
733 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
734 if (ret < 0)
735 return ret;
736
737 if (!tb[CTA_PROTO_NUM])
738 return -EINVAL;
739 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
740
741 rcu_read_lock();
742 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
743
744 if (likely(l4proto->nlattr_to_tuple)) {
745 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
746 l4proto->nla_policy);
747 if (ret == 0)
748 ret = l4proto->nlattr_to_tuple(tb, tuple);
749 }
750
751 rcu_read_unlock();
752
753 return ret;
754 }
755
756 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
757 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
758 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
759 };
760
761 static int
762 ctnetlink_parse_tuple(const struct nlattr * const cda[],
763 struct nf_conntrack_tuple *tuple,
764 enum ctattr_tuple type, u_int8_t l3num)
765 {
766 struct nlattr *tb[CTA_TUPLE_MAX+1];
767 int err;
768
769 memset(tuple, 0, sizeof(*tuple));
770
771 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
772
773 if (!tb[CTA_TUPLE_IP])
774 return -EINVAL;
775
776 tuple->src.l3num = l3num;
777
778 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
779 if (err < 0)
780 return err;
781
782 if (!tb[CTA_TUPLE_PROTO])
783 return -EINVAL;
784
785 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
786 if (err < 0)
787 return err;
788
789 /* orig and expect tuples get DIR_ORIGINAL */
790 if (type == CTA_TUPLE_REPLY)
791 tuple->dst.dir = IP_CT_DIR_REPLY;
792 else
793 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
794
795 return 0;
796 }
797
798 static int
799 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
800 {
801 if (attr)
802 #ifdef CONFIG_NF_CONNTRACK_ZONES
803 *zone = ntohs(nla_get_be16(attr));
804 #else
805 return -EOPNOTSUPP;
806 #endif
807 else
808 *zone = 0;
809
810 return 0;
811 }
812
813 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
814 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
815 };
816
817 static inline int
818 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
819 {
820 struct nlattr *tb[CTA_HELP_MAX+1];
821
822 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
823
824 if (!tb[CTA_HELP_NAME])
825 return -EINVAL;
826
827 *helper_name = nla_data(tb[CTA_HELP_NAME]);
828
829 return 0;
830 }
831
832 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
833 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
834 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
835 [CTA_STATUS] = { .type = NLA_U32 },
836 [CTA_PROTOINFO] = { .type = NLA_NESTED },
837 [CTA_HELP] = { .type = NLA_NESTED },
838 [CTA_NAT_SRC] = { .type = NLA_NESTED },
839 [CTA_TIMEOUT] = { .type = NLA_U32 },
840 [CTA_MARK] = { .type = NLA_U32 },
841 [CTA_ID] = { .type = NLA_U32 },
842 [CTA_NAT_DST] = { .type = NLA_NESTED },
843 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
844 [CTA_ZONE] = { .type = NLA_U16 },
845 };
846
847 static int
848 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
849 const struct nlmsghdr *nlh,
850 const struct nlattr * const cda[])
851 {
852 struct net *net = sock_net(ctnl);
853 struct nf_conntrack_tuple_hash *h;
854 struct nf_conntrack_tuple tuple;
855 struct nf_conn *ct;
856 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
857 u_int8_t u3 = nfmsg->nfgen_family;
858 u16 zone;
859 int err;
860
861 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
862 if (err < 0)
863 return err;
864
865 if (cda[CTA_TUPLE_ORIG])
866 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
867 else if (cda[CTA_TUPLE_REPLY])
868 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
869 else {
870 /* Flush the whole table */
871 nf_conntrack_flush_report(net,
872 NETLINK_CB(skb).pid,
873 nlmsg_report(nlh));
874 return 0;
875 }
876
877 if (err < 0)
878 return err;
879
880 h = nf_conntrack_find_get(net, zone, &tuple);
881 if (!h)
882 return -ENOENT;
883
884 ct = nf_ct_tuplehash_to_ctrack(h);
885
886 if (cda[CTA_ID]) {
887 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
888 if (id != (u32)(unsigned long)ct) {
889 nf_ct_put(ct);
890 return -ENOENT;
891 }
892 }
893
894 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
895 NETLINK_CB(skb).pid,
896 nlmsg_report(nlh)) < 0) {
897 nf_ct_delete_from_lists(ct);
898 /* we failed to report the event, try later */
899 nf_ct_insert_dying_list(ct);
900 nf_ct_put(ct);
901 return 0;
902 }
903
904 /* death_by_timeout would report the event again */
905 set_bit(IPS_DYING_BIT, &ct->status);
906
907 nf_ct_kill(ct);
908 nf_ct_put(ct);
909
910 return 0;
911 }
912
913 static int
914 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
915 const struct nlmsghdr *nlh,
916 const struct nlattr * const cda[])
917 {
918 struct net *net = sock_net(ctnl);
919 struct nf_conntrack_tuple_hash *h;
920 struct nf_conntrack_tuple tuple;
921 struct nf_conn *ct;
922 struct sk_buff *skb2 = NULL;
923 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
924 u_int8_t u3 = nfmsg->nfgen_family;
925 u16 zone;
926 int err;
927
928 if (nlh->nlmsg_flags & NLM_F_DUMP)
929 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
930 ctnetlink_done);
931
932 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
933 if (err < 0)
934 return err;
935
936 if (cda[CTA_TUPLE_ORIG])
937 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
938 else if (cda[CTA_TUPLE_REPLY])
939 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
940 else
941 return -EINVAL;
942
943 if (err < 0)
944 return err;
945
946 h = nf_conntrack_find_get(net, zone, &tuple);
947 if (!h)
948 return -ENOENT;
949
950 ct = nf_ct_tuplehash_to_ctrack(h);
951
952 err = -ENOMEM;
953 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
954 if (skb2 == NULL) {
955 nf_ct_put(ct);
956 return -ENOMEM;
957 }
958
959 rcu_read_lock();
960 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
961 IPCTNL_MSG_CT_NEW, ct);
962 rcu_read_unlock();
963 nf_ct_put(ct);
964 if (err <= 0)
965 goto free;
966
967 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
968 if (err < 0)
969 goto out;
970
971 return 0;
972
973 free:
974 kfree_skb(skb2);
975 out:
976 return err;
977 }
978
979 #ifdef CONFIG_NF_NAT_NEEDED
980 static int
981 ctnetlink_parse_nat_setup(struct nf_conn *ct,
982 enum nf_nat_manip_type manip,
983 const struct nlattr *attr)
984 {
985 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
986
987 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
988 if (!parse_nat_setup) {
989 #ifdef CONFIG_MODULES
990 rcu_read_unlock();
991 spin_unlock_bh(&nf_conntrack_lock);
992 nfnl_unlock();
993 if (request_module("nf-nat-ipv4") < 0) {
994 nfnl_lock();
995 spin_lock_bh(&nf_conntrack_lock);
996 rcu_read_lock();
997 return -EOPNOTSUPP;
998 }
999 nfnl_lock();
1000 spin_lock_bh(&nf_conntrack_lock);
1001 rcu_read_lock();
1002 if (nfnetlink_parse_nat_setup_hook)
1003 return -EAGAIN;
1004 #endif
1005 return -EOPNOTSUPP;
1006 }
1007
1008 return parse_nat_setup(ct, manip, attr);
1009 }
1010 #endif
1011
1012 static int
1013 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1014 {
1015 unsigned long d;
1016 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1017 d = ct->status ^ status;
1018
1019 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1020 /* unchangeable */
1021 return -EBUSY;
1022
1023 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1024 /* SEEN_REPLY bit can only be set */
1025 return -EBUSY;
1026
1027 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1028 /* ASSURED bit can only be set */
1029 return -EBUSY;
1030
1031 /* Be careful here, modifying NAT bits can screw up things,
1032 * so don't let users modify them directly if they don't pass
1033 * nf_nat_range. */
1034 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1035 return 0;
1036 }
1037
1038 static int
1039 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1040 {
1041 #ifdef CONFIG_NF_NAT_NEEDED
1042 int ret;
1043
1044 if (cda[CTA_NAT_DST]) {
1045 ret = ctnetlink_parse_nat_setup(ct,
1046 IP_NAT_MANIP_DST,
1047 cda[CTA_NAT_DST]);
1048 if (ret < 0)
1049 return ret;
1050 }
1051 if (cda[CTA_NAT_SRC]) {
1052 ret = ctnetlink_parse_nat_setup(ct,
1053 IP_NAT_MANIP_SRC,
1054 cda[CTA_NAT_SRC]);
1055 if (ret < 0)
1056 return ret;
1057 }
1058 return 0;
1059 #else
1060 return -EOPNOTSUPP;
1061 #endif
1062 }
1063
1064 static inline int
1065 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1066 {
1067 struct nf_conntrack_helper *helper;
1068 struct nf_conn_help *help = nfct_help(ct);
1069 char *helpname = NULL;
1070 int err;
1071
1072 /* don't change helper of sibling connections */
1073 if (ct->master)
1074 return -EBUSY;
1075
1076 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1077 if (err < 0)
1078 return err;
1079
1080 if (!strcmp(helpname, "")) {
1081 if (help && help->helper) {
1082 /* we had a helper before ... */
1083 nf_ct_remove_expectations(ct);
1084 rcu_assign_pointer(help->helper, NULL);
1085 }
1086
1087 return 0;
1088 }
1089
1090 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1091 nf_ct_protonum(ct));
1092 if (helper == NULL) {
1093 #ifdef CONFIG_MODULES
1094 spin_unlock_bh(&nf_conntrack_lock);
1095
1096 if (request_module("nfct-helper-%s", helpname) < 0) {
1097 spin_lock_bh(&nf_conntrack_lock);
1098 return -EOPNOTSUPP;
1099 }
1100
1101 spin_lock_bh(&nf_conntrack_lock);
1102 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1103 nf_ct_protonum(ct));
1104 if (helper)
1105 return -EAGAIN;
1106 #endif
1107 return -EOPNOTSUPP;
1108 }
1109
1110 if (help) {
1111 if (help->helper == helper)
1112 return 0;
1113 if (help->helper)
1114 return -EBUSY;
1115 /* need to zero data of old helper */
1116 memset(&help->help, 0, sizeof(help->help));
1117 } else {
1118 /* we cannot set a helper for an existing conntrack */
1119 return -EOPNOTSUPP;
1120 }
1121
1122 rcu_assign_pointer(help->helper, helper);
1123
1124 return 0;
1125 }
1126
1127 static inline int
1128 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1129 {
1130 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1131
1132 if (!del_timer(&ct->timeout))
1133 return -ETIME;
1134
1135 ct->timeout.expires = jiffies + timeout * HZ;
1136 add_timer(&ct->timeout);
1137
1138 return 0;
1139 }
1140
1141 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1142 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1143 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1144 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1145 };
1146
1147 static inline int
1148 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1149 {
1150 const struct nlattr *attr = cda[CTA_PROTOINFO];
1151 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1152 struct nf_conntrack_l4proto *l4proto;
1153 int err = 0;
1154
1155 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1156
1157 rcu_read_lock();
1158 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1159 if (l4proto->from_nlattr)
1160 err = l4proto->from_nlattr(tb, ct);
1161 rcu_read_unlock();
1162
1163 return err;
1164 }
1165
1166 #ifdef CONFIG_NF_NAT_NEEDED
1167 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1168 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1169 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1170 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1171 };
1172
1173 static inline int
1174 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1175 {
1176 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1177
1178 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1179
1180 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1181 return -EINVAL;
1182
1183 natseq->correction_pos =
1184 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1185
1186 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1187 return -EINVAL;
1188
1189 natseq->offset_before =
1190 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1191
1192 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1193 return -EINVAL;
1194
1195 natseq->offset_after =
1196 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1197
1198 return 0;
1199 }
1200
1201 static int
1202 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1203 const struct nlattr * const cda[])
1204 {
1205 int ret = 0;
1206 struct nf_conn_nat *nat = nfct_nat(ct);
1207
1208 if (!nat)
1209 return 0;
1210
1211 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1212 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1213 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1214 if (ret < 0)
1215 return ret;
1216
1217 ct->status |= IPS_SEQ_ADJUST;
1218 }
1219
1220 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1221 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1222 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1223 if (ret < 0)
1224 return ret;
1225
1226 ct->status |= IPS_SEQ_ADJUST;
1227 }
1228
1229 return 0;
1230 }
1231 #endif
1232
1233 static int
1234 ctnetlink_change_conntrack(struct nf_conn *ct,
1235 const struct nlattr * const cda[])
1236 {
1237 int err;
1238
1239 /* only allow NAT changes and master assignation for new conntracks */
1240 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1241 return -EOPNOTSUPP;
1242
1243 if (cda[CTA_HELP]) {
1244 err = ctnetlink_change_helper(ct, cda);
1245 if (err < 0)
1246 return err;
1247 }
1248
1249 if (cda[CTA_TIMEOUT]) {
1250 err = ctnetlink_change_timeout(ct, cda);
1251 if (err < 0)
1252 return err;
1253 }
1254
1255 if (cda[CTA_STATUS]) {
1256 err = ctnetlink_change_status(ct, cda);
1257 if (err < 0)
1258 return err;
1259 }
1260
1261 if (cda[CTA_PROTOINFO]) {
1262 err = ctnetlink_change_protoinfo(ct, cda);
1263 if (err < 0)
1264 return err;
1265 }
1266
1267 #if defined(CONFIG_NF_CONNTRACK_MARK)
1268 if (cda[CTA_MARK])
1269 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1270 #endif
1271
1272 #ifdef CONFIG_NF_NAT_NEEDED
1273 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1274 err = ctnetlink_change_nat_seq_adj(ct, cda);
1275 if (err < 0)
1276 return err;
1277 }
1278 #endif
1279
1280 return 0;
1281 }
1282
1283 static struct nf_conn *
1284 ctnetlink_create_conntrack(struct net *net, u16 zone,
1285 const struct nlattr * const cda[],
1286 struct nf_conntrack_tuple *otuple,
1287 struct nf_conntrack_tuple *rtuple,
1288 u8 u3)
1289 {
1290 struct nf_conn *ct;
1291 int err = -EINVAL;
1292 struct nf_conntrack_helper *helper;
1293
1294 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1295 if (IS_ERR(ct))
1296 return ERR_PTR(-ENOMEM);
1297
1298 if (!cda[CTA_TIMEOUT])
1299 goto err1;
1300 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1301
1302 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1303
1304 rcu_read_lock();
1305 if (cda[CTA_HELP]) {
1306 char *helpname = NULL;
1307
1308 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1309 if (err < 0)
1310 goto err2;
1311
1312 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1313 nf_ct_protonum(ct));
1314 if (helper == NULL) {
1315 rcu_read_unlock();
1316 #ifdef CONFIG_MODULES
1317 if (request_module("nfct-helper-%s", helpname) < 0) {
1318 err = -EOPNOTSUPP;
1319 goto err1;
1320 }
1321
1322 rcu_read_lock();
1323 helper = __nf_conntrack_helper_find(helpname,
1324 nf_ct_l3num(ct),
1325 nf_ct_protonum(ct));
1326 if (helper) {
1327 err = -EAGAIN;
1328 goto err2;
1329 }
1330 rcu_read_unlock();
1331 #endif
1332 err = -EOPNOTSUPP;
1333 goto err1;
1334 } else {
1335 struct nf_conn_help *help;
1336
1337 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1338 if (help == NULL) {
1339 err = -ENOMEM;
1340 goto err2;
1341 }
1342
1343 /* not in hash table yet so not strictly necessary */
1344 rcu_assign_pointer(help->helper, helper);
1345 }
1346 } else {
1347 /* try an implicit helper assignation */
1348 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1349 if (err < 0)
1350 goto err2;
1351 }
1352
1353 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1354 err = ctnetlink_change_nat(ct, cda);
1355 if (err < 0)
1356 goto err2;
1357 }
1358
1359 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1360 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1361 /* we must add conntrack extensions before confirmation. */
1362 ct->status |= IPS_CONFIRMED;
1363
1364 if (cda[CTA_STATUS]) {
1365 err = ctnetlink_change_status(ct, cda);
1366 if (err < 0)
1367 goto err2;
1368 }
1369
1370 #ifdef CONFIG_NF_NAT_NEEDED
1371 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1372 err = ctnetlink_change_nat_seq_adj(ct, cda);
1373 if (err < 0)
1374 goto err2;
1375 }
1376 #endif
1377
1378 if (cda[CTA_PROTOINFO]) {
1379 err = ctnetlink_change_protoinfo(ct, cda);
1380 if (err < 0)
1381 goto err2;
1382 }
1383
1384 #if defined(CONFIG_NF_CONNTRACK_MARK)
1385 if (cda[CTA_MARK])
1386 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1387 #endif
1388
1389 /* setup master conntrack: this is a confirmed expectation */
1390 if (cda[CTA_TUPLE_MASTER]) {
1391 struct nf_conntrack_tuple master;
1392 struct nf_conntrack_tuple_hash *master_h;
1393 struct nf_conn *master_ct;
1394
1395 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1396 if (err < 0)
1397 goto err2;
1398
1399 master_h = nf_conntrack_find_get(net, zone, &master);
1400 if (master_h == NULL) {
1401 err = -ENOENT;
1402 goto err2;
1403 }
1404 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1405 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1406 ct->master = master_ct;
1407 }
1408
1409 add_timer(&ct->timeout);
1410 nf_conntrack_hash_insert(ct);
1411 rcu_read_unlock();
1412
1413 return ct;
1414
1415 err2:
1416 rcu_read_unlock();
1417 err1:
1418 nf_conntrack_free(ct);
1419 return ERR_PTR(err);
1420 }
1421
1422 static int
1423 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1424 const struct nlmsghdr *nlh,
1425 const struct nlattr * const cda[])
1426 {
1427 struct net *net = sock_net(ctnl);
1428 struct nf_conntrack_tuple otuple, rtuple;
1429 struct nf_conntrack_tuple_hash *h = NULL;
1430 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1431 u_int8_t u3 = nfmsg->nfgen_family;
1432 u16 zone;
1433 int err;
1434
1435 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1436 if (err < 0)
1437 return err;
1438
1439 if (cda[CTA_TUPLE_ORIG]) {
1440 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1441 if (err < 0)
1442 return err;
1443 }
1444
1445 if (cda[CTA_TUPLE_REPLY]) {
1446 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1447 if (err < 0)
1448 return err;
1449 }
1450
1451 spin_lock_bh(&nf_conntrack_lock);
1452 if (cda[CTA_TUPLE_ORIG])
1453 h = __nf_conntrack_find(net, zone, &otuple);
1454 else if (cda[CTA_TUPLE_REPLY])
1455 h = __nf_conntrack_find(net, zone, &rtuple);
1456
1457 if (h == NULL) {
1458 err = -ENOENT;
1459 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1460 struct nf_conn *ct;
1461 enum ip_conntrack_events events;
1462
1463 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1464 &rtuple, u3);
1465 if (IS_ERR(ct)) {
1466 err = PTR_ERR(ct);
1467 goto out_unlock;
1468 }
1469 err = 0;
1470 nf_conntrack_get(&ct->ct_general);
1471 spin_unlock_bh(&nf_conntrack_lock);
1472 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1473 events = IPCT_RELATED;
1474 else
1475 events = IPCT_NEW;
1476
1477 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1478 (1 << IPCT_ASSURED) |
1479 (1 << IPCT_HELPER) |
1480 (1 << IPCT_PROTOINFO) |
1481 (1 << IPCT_NATSEQADJ) |
1482 (1 << IPCT_MARK) | events,
1483 ct, NETLINK_CB(skb).pid,
1484 nlmsg_report(nlh));
1485 nf_ct_put(ct);
1486 } else
1487 spin_unlock_bh(&nf_conntrack_lock);
1488
1489 return err;
1490 }
1491 /* implicit 'else' */
1492
1493 /* We manipulate the conntrack inside the global conntrack table lock,
1494 * so there's no need to increase the refcount */
1495 err = -EEXIST;
1496 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1497 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1498
1499 err = ctnetlink_change_conntrack(ct, cda);
1500 if (err == 0) {
1501 nf_conntrack_get(&ct->ct_general);
1502 spin_unlock_bh(&nf_conntrack_lock);
1503 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1504 (1 << IPCT_ASSURED) |
1505 (1 << IPCT_HELPER) |
1506 (1 << IPCT_PROTOINFO) |
1507 (1 << IPCT_NATSEQADJ) |
1508 (1 << IPCT_MARK),
1509 ct, NETLINK_CB(skb).pid,
1510 nlmsg_report(nlh));
1511 nf_ct_put(ct);
1512 } else
1513 spin_unlock_bh(&nf_conntrack_lock);
1514
1515 return err;
1516 }
1517
1518 out_unlock:
1519 spin_unlock_bh(&nf_conntrack_lock);
1520 return err;
1521 }
1522
1523 /***********************************************************************
1524 * EXPECT
1525 ***********************************************************************/
1526
1527 static inline int
1528 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1529 const struct nf_conntrack_tuple *tuple,
1530 enum ctattr_expect type)
1531 {
1532 struct nlattr *nest_parms;
1533
1534 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1535 if (!nest_parms)
1536 goto nla_put_failure;
1537 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1538 goto nla_put_failure;
1539 nla_nest_end(skb, nest_parms);
1540
1541 return 0;
1542
1543 nla_put_failure:
1544 return -1;
1545 }
1546
1547 static inline int
1548 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1549 const struct nf_conntrack_tuple *tuple,
1550 const struct nf_conntrack_tuple_mask *mask)
1551 {
1552 int ret;
1553 struct nf_conntrack_l3proto *l3proto;
1554 struct nf_conntrack_l4proto *l4proto;
1555 struct nf_conntrack_tuple m;
1556 struct nlattr *nest_parms;
1557
1558 memset(&m, 0xFF, sizeof(m));
1559 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1560 m.src.u.all = mask->src.u.all;
1561 m.dst.protonum = tuple->dst.protonum;
1562
1563 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1564 if (!nest_parms)
1565 goto nla_put_failure;
1566
1567 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1568 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1569
1570 if (unlikely(ret < 0))
1571 goto nla_put_failure;
1572
1573 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1574 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1575 if (unlikely(ret < 0))
1576 goto nla_put_failure;
1577
1578 nla_nest_end(skb, nest_parms);
1579
1580 return 0;
1581
1582 nla_put_failure:
1583 return -1;
1584 }
1585
1586 static int
1587 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1588 const struct nf_conntrack_expect *exp)
1589 {
1590 struct nf_conn *master = exp->master;
1591 long timeout = (exp->timeout.expires - jiffies) / HZ;
1592 struct nf_conn_help *help;
1593
1594 if (timeout < 0)
1595 timeout = 0;
1596
1597 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1598 goto nla_put_failure;
1599 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1600 goto nla_put_failure;
1601 if (ctnetlink_exp_dump_tuple(skb,
1602 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1603 CTA_EXPECT_MASTER) < 0)
1604 goto nla_put_failure;
1605
1606 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1607 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1608 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1609 help = nfct_help(master);
1610 if (help) {
1611 struct nf_conntrack_helper *helper;
1612
1613 helper = rcu_dereference(help->helper);
1614 if (helper)
1615 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1616 }
1617
1618 return 0;
1619
1620 nla_put_failure:
1621 return -1;
1622 }
1623
1624 static int
1625 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1626 int event, const struct nf_conntrack_expect *exp)
1627 {
1628 struct nlmsghdr *nlh;
1629 struct nfgenmsg *nfmsg;
1630 unsigned int flags = pid ? NLM_F_MULTI : 0;
1631
1632 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1633 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1634 if (nlh == NULL)
1635 goto nlmsg_failure;
1636
1637 nfmsg = nlmsg_data(nlh);
1638 nfmsg->nfgen_family = exp->tuple.src.l3num;
1639 nfmsg->version = NFNETLINK_V0;
1640 nfmsg->res_id = 0;
1641
1642 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1643 goto nla_put_failure;
1644
1645 nlmsg_end(skb, nlh);
1646 return skb->len;
1647
1648 nlmsg_failure:
1649 nla_put_failure:
1650 nlmsg_cancel(skb, nlh);
1651 return -1;
1652 }
1653
1654 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1655 static int
1656 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1657 {
1658 struct nf_conntrack_expect *exp = item->exp;
1659 struct net *net = nf_ct_exp_net(exp);
1660 struct nlmsghdr *nlh;
1661 struct nfgenmsg *nfmsg;
1662 struct sk_buff *skb;
1663 unsigned int type, group;
1664 int flags = 0;
1665
1666 if (events & (1 << IPEXP_DESTROY)) {
1667 type = IPCTNL_MSG_EXP_DELETE;
1668 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1669 } else if (events & (1 << IPEXP_NEW)) {
1670 type = IPCTNL_MSG_EXP_NEW;
1671 flags = NLM_F_CREATE|NLM_F_EXCL;
1672 group = NFNLGRP_CONNTRACK_EXP_NEW;
1673 } else
1674 return 0;
1675
1676 if (!item->report && !nfnetlink_has_listeners(net, group))
1677 return 0;
1678
1679 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1680 if (skb == NULL)
1681 goto errout;
1682
1683 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1684 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1685 if (nlh == NULL)
1686 goto nlmsg_failure;
1687
1688 nfmsg = nlmsg_data(nlh);
1689 nfmsg->nfgen_family = exp->tuple.src.l3num;
1690 nfmsg->version = NFNETLINK_V0;
1691 nfmsg->res_id = 0;
1692
1693 rcu_read_lock();
1694 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1695 goto nla_put_failure;
1696 rcu_read_unlock();
1697
1698 nlmsg_end(skb, nlh);
1699 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1700 return 0;
1701
1702 nla_put_failure:
1703 rcu_read_unlock();
1704 nlmsg_cancel(skb, nlh);
1705 nlmsg_failure:
1706 kfree_skb(skb);
1707 errout:
1708 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1709 return 0;
1710 }
1711 #endif
1712 static int ctnetlink_exp_done(struct netlink_callback *cb)
1713 {
1714 if (cb->args[1])
1715 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1716 return 0;
1717 }
1718
1719 static int
1720 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1721 {
1722 struct net *net = sock_net(skb->sk);
1723 struct nf_conntrack_expect *exp, *last;
1724 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1725 struct hlist_node *n;
1726 u_int8_t l3proto = nfmsg->nfgen_family;
1727
1728 rcu_read_lock();
1729 last = (struct nf_conntrack_expect *)cb->args[1];
1730 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1731 restart:
1732 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1733 hnode) {
1734 if (l3proto && exp->tuple.src.l3num != l3proto)
1735 continue;
1736 if (cb->args[1]) {
1737 if (exp != last)
1738 continue;
1739 cb->args[1] = 0;
1740 }
1741 if (ctnetlink_exp_fill_info(skb,
1742 NETLINK_CB(cb->skb).pid,
1743 cb->nlh->nlmsg_seq,
1744 IPCTNL_MSG_EXP_NEW,
1745 exp) < 0) {
1746 if (!atomic_inc_not_zero(&exp->use))
1747 continue;
1748 cb->args[1] = (unsigned long)exp;
1749 goto out;
1750 }
1751 }
1752 if (cb->args[1]) {
1753 cb->args[1] = 0;
1754 goto restart;
1755 }
1756 }
1757 out:
1758 rcu_read_unlock();
1759 if (last)
1760 nf_ct_expect_put(last);
1761
1762 return skb->len;
1763 }
1764
1765 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1766 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1767 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1768 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1769 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1770 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1771 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1772 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1773 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1774 };
1775
1776 static int
1777 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1778 const struct nlmsghdr *nlh,
1779 const struct nlattr * const cda[])
1780 {
1781 struct net *net = sock_net(ctnl);
1782 struct nf_conntrack_tuple tuple;
1783 struct nf_conntrack_expect *exp;
1784 struct sk_buff *skb2;
1785 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1786 u_int8_t u3 = nfmsg->nfgen_family;
1787 u16 zone;
1788 int err;
1789
1790 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1791 return netlink_dump_start(ctnl, skb, nlh,
1792 ctnetlink_exp_dump_table,
1793 ctnetlink_exp_done);
1794 }
1795
1796 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1797 if (err < 0)
1798 return err;
1799
1800 if (cda[CTA_EXPECT_MASTER])
1801 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1802 else
1803 return -EINVAL;
1804
1805 if (err < 0)
1806 return err;
1807
1808 exp = nf_ct_expect_find_get(net, zone, &tuple);
1809 if (!exp)
1810 return -ENOENT;
1811
1812 if (cda[CTA_EXPECT_ID]) {
1813 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1814 if (ntohl(id) != (u32)(unsigned long)exp) {
1815 nf_ct_expect_put(exp);
1816 return -ENOENT;
1817 }
1818 }
1819
1820 err = -ENOMEM;
1821 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1822 if (skb2 == NULL)
1823 goto out;
1824
1825 rcu_read_lock();
1826 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1827 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1828 rcu_read_unlock();
1829 if (err <= 0)
1830 goto free;
1831
1832 nf_ct_expect_put(exp);
1833
1834 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1835
1836 free:
1837 kfree_skb(skb2);
1838 out:
1839 nf_ct_expect_put(exp);
1840 return err;
1841 }
1842
1843 static int
1844 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1845 const struct nlmsghdr *nlh,
1846 const struct nlattr * const cda[])
1847 {
1848 struct net *net = sock_net(ctnl);
1849 struct nf_conntrack_expect *exp;
1850 struct nf_conntrack_tuple tuple;
1851 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1852 struct hlist_node *n, *next;
1853 u_int8_t u3 = nfmsg->nfgen_family;
1854 unsigned int i;
1855 u16 zone;
1856 int err;
1857
1858 if (cda[CTA_EXPECT_TUPLE]) {
1859 /* delete a single expect by tuple */
1860 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1861 if (err < 0)
1862 return err;
1863
1864 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1865 if (err < 0)
1866 return err;
1867
1868 /* bump usage count to 2 */
1869 exp = nf_ct_expect_find_get(net, zone, &tuple);
1870 if (!exp)
1871 return -ENOENT;
1872
1873 if (cda[CTA_EXPECT_ID]) {
1874 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1875 if (ntohl(id) != (u32)(unsigned long)exp) {
1876 nf_ct_expect_put(exp);
1877 return -ENOENT;
1878 }
1879 }
1880
1881 /* after list removal, usage count == 1 */
1882 spin_lock_bh(&nf_conntrack_lock);
1883 if (del_timer(&exp->timeout)) {
1884 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1885 nlmsg_report(nlh));
1886 nf_ct_expect_put(exp);
1887 }
1888 spin_unlock_bh(&nf_conntrack_lock);
1889 /* have to put what we 'get' above.
1890 * after this line usage count == 0 */
1891 nf_ct_expect_put(exp);
1892 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1893 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1894 struct nf_conn_help *m_help;
1895
1896 /* delete all expectations for this helper */
1897 spin_lock_bh(&nf_conntrack_lock);
1898 for (i = 0; i < nf_ct_expect_hsize; i++) {
1899 hlist_for_each_entry_safe(exp, n, next,
1900 &net->ct.expect_hash[i],
1901 hnode) {
1902 m_help = nfct_help(exp->master);
1903 if (!strcmp(m_help->helper->name, name) &&
1904 del_timer(&exp->timeout)) {
1905 nf_ct_unlink_expect_report(exp,
1906 NETLINK_CB(skb).pid,
1907 nlmsg_report(nlh));
1908 nf_ct_expect_put(exp);
1909 }
1910 }
1911 }
1912 spin_unlock_bh(&nf_conntrack_lock);
1913 } else {
1914 /* This basically means we have to flush everything*/
1915 spin_lock_bh(&nf_conntrack_lock);
1916 for (i = 0; i < nf_ct_expect_hsize; i++) {
1917 hlist_for_each_entry_safe(exp, n, next,
1918 &net->ct.expect_hash[i],
1919 hnode) {
1920 if (del_timer(&exp->timeout)) {
1921 nf_ct_unlink_expect_report(exp,
1922 NETLINK_CB(skb).pid,
1923 nlmsg_report(nlh));
1924 nf_ct_expect_put(exp);
1925 }
1926 }
1927 }
1928 spin_unlock_bh(&nf_conntrack_lock);
1929 }
1930
1931 return 0;
1932 }
1933 static int
1934 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1935 const struct nlattr * const cda[])
1936 {
1937 return -EOPNOTSUPP;
1938 }
1939
1940 static int
1941 ctnetlink_create_expect(struct net *net, u16 zone,
1942 const struct nlattr * const cda[],
1943 u_int8_t u3,
1944 u32 pid, int report)
1945 {
1946 struct nf_conntrack_tuple tuple, mask, master_tuple;
1947 struct nf_conntrack_tuple_hash *h = NULL;
1948 struct nf_conntrack_expect *exp;
1949 struct nf_conn *ct;
1950 struct nf_conn_help *help;
1951 int err = 0;
1952
1953 /* caller guarantees that those three CTA_EXPECT_* exist */
1954 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1955 if (err < 0)
1956 return err;
1957 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1958 if (err < 0)
1959 return err;
1960 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1961 if (err < 0)
1962 return err;
1963
1964 /* Look for master conntrack of this expectation */
1965 h = nf_conntrack_find_get(net, zone, &master_tuple);
1966 if (!h)
1967 return -ENOENT;
1968 ct = nf_ct_tuplehash_to_ctrack(h);
1969 exp = nf_ct_expect_alloc(ct);
1970 if (!exp) {
1971 err = -ENOMEM;
1972 goto out;
1973 }
1974 help = nfct_help(ct);
1975 if (!help) {
1976 if (!cda[CTA_EXPECT_TIMEOUT]) {
1977 err = -EINVAL;
1978 goto out;
1979 }
1980 exp->timeout.expires =
1981 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
1982
1983 exp->flags = NF_CT_EXPECT_USERSPACE;
1984 if (cda[CTA_EXPECT_FLAGS]) {
1985 exp->flags |=
1986 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1987 }
1988 } else {
1989 if (cda[CTA_EXPECT_FLAGS]) {
1990 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1991 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
1992 } else
1993 exp->flags = 0;
1994 }
1995
1996 exp->class = 0;
1997 exp->expectfn = NULL;
1998 exp->master = ct;
1999 exp->helper = NULL;
2000 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2001 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2002 exp->mask.src.u.all = mask.src.u.all;
2003
2004 err = nf_ct_expect_related_report(exp, pid, report);
2005 nf_ct_expect_put(exp);
2006
2007 out:
2008 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2009 return err;
2010 }
2011
2012 static int
2013 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2014 const struct nlmsghdr *nlh,
2015 const struct nlattr * const cda[])
2016 {
2017 struct net *net = sock_net(ctnl);
2018 struct nf_conntrack_tuple tuple;
2019 struct nf_conntrack_expect *exp;
2020 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2021 u_int8_t u3 = nfmsg->nfgen_family;
2022 u16 zone;
2023 int err;
2024
2025 if (!cda[CTA_EXPECT_TUPLE]
2026 || !cda[CTA_EXPECT_MASK]
2027 || !cda[CTA_EXPECT_MASTER])
2028 return -EINVAL;
2029
2030 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2031 if (err < 0)
2032 return err;
2033
2034 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2035 if (err < 0)
2036 return err;
2037
2038 spin_lock_bh(&nf_conntrack_lock);
2039 exp = __nf_ct_expect_find(net, zone, &tuple);
2040
2041 if (!exp) {
2042 spin_unlock_bh(&nf_conntrack_lock);
2043 err = -ENOENT;
2044 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2045 err = ctnetlink_create_expect(net, zone, cda,
2046 u3,
2047 NETLINK_CB(skb).pid,
2048 nlmsg_report(nlh));
2049 }
2050 return err;
2051 }
2052
2053 err = -EEXIST;
2054 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2055 err = ctnetlink_change_expect(exp, cda);
2056 spin_unlock_bh(&nf_conntrack_lock);
2057
2058 return err;
2059 }
2060
2061 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2062 static struct nf_ct_event_notifier ctnl_notifier = {
2063 .fcn = ctnetlink_conntrack_event,
2064 };
2065
2066 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2067 .fcn = ctnetlink_expect_event,
2068 };
2069 #endif
2070
2071 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2072 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2073 .attr_count = CTA_MAX,
2074 .policy = ct_nla_policy },
2075 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2076 .attr_count = CTA_MAX,
2077 .policy = ct_nla_policy },
2078 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2079 .attr_count = CTA_MAX,
2080 .policy = ct_nla_policy },
2081 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2082 .attr_count = CTA_MAX,
2083 .policy = ct_nla_policy },
2084 };
2085
2086 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2087 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2088 .attr_count = CTA_EXPECT_MAX,
2089 .policy = exp_nla_policy },
2090 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2091 .attr_count = CTA_EXPECT_MAX,
2092 .policy = exp_nla_policy },
2093 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2094 .attr_count = CTA_EXPECT_MAX,
2095 .policy = exp_nla_policy },
2096 };
2097
2098 static const struct nfnetlink_subsystem ctnl_subsys = {
2099 .name = "conntrack",
2100 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2101 .cb_count = IPCTNL_MSG_MAX,
2102 .cb = ctnl_cb,
2103 };
2104
2105 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2106 .name = "conntrack_expect",
2107 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2108 .cb_count = IPCTNL_MSG_EXP_MAX,
2109 .cb = ctnl_exp_cb,
2110 };
2111
2112 MODULE_ALIAS("ip_conntrack_netlink");
2113 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2114 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2115
2116 static int __init ctnetlink_init(void)
2117 {
2118 int ret;
2119
2120 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2121 ret = nfnetlink_subsys_register(&ctnl_subsys);
2122 if (ret < 0) {
2123 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2124 goto err_out;
2125 }
2126
2127 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2128 if (ret < 0) {
2129 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2130 goto err_unreg_subsys;
2131 }
2132
2133 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2134 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2135 if (ret < 0) {
2136 pr_err("ctnetlink_init: cannot register notifier.\n");
2137 goto err_unreg_exp_subsys;
2138 }
2139
2140 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2141 if (ret < 0) {
2142 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2143 goto err_unreg_notifier;
2144 }
2145 #endif
2146
2147 return 0;
2148
2149 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2150 err_unreg_notifier:
2151 nf_conntrack_unregister_notifier(&ctnl_notifier);
2152 err_unreg_exp_subsys:
2153 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2154 #endif
2155 err_unreg_subsys:
2156 nfnetlink_subsys_unregister(&ctnl_subsys);
2157 err_out:
2158 return ret;
2159 }
2160
2161 static void __exit ctnetlink_exit(void)
2162 {
2163 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2164
2165 nf_ct_remove_userspace_expectations();
2166 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2167 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2168 nf_conntrack_unregister_notifier(&ctnl_notifier);
2169 #endif
2170
2171 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2172 nfnetlink_subsys_unregister(&ctnl_subsys);
2173 }
2174
2175 module_init(ctnetlink_init);
2176 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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