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) 2005-2012 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_seqadj.h>
41 #include <net/netfilter/nf_conntrack_l3proto.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #include <net/netfilter/nf_conntrack_seqadj.h>
49 #include <net/netfilter/nf_conntrack_synproxy.h>
50 #ifdef CONFIG_NF_NAT_NEEDED
51 #include <net/netfilter/nf_nat_core.h>
52 #include <net/netfilter/nf_nat_l4proto.h>
53 #include <net/netfilter/nf_nat_helper.h>
54 #endif
55
56 #include <linux/netfilter/nfnetlink.h>
57 #include <linux/netfilter/nfnetlink_conntrack.h>
58
59 MODULE_LICENSE("GPL");
60
61 static char __initdata version[] = "0.93";
62
ctnetlink_dump_tuples_proto(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,struct nf_conntrack_l4proto * l4proto)63 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
64 const struct nf_conntrack_tuple *tuple,
65 struct nf_conntrack_l4proto *l4proto)
66 {
67 int ret = 0;
68 struct nlattr *nest_parms;
69
70 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
71 if (!nest_parms)
72 goto nla_put_failure;
73 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
74 goto nla_put_failure;
75
76 if (likely(l4proto->tuple_to_nlattr))
77 ret = l4proto->tuple_to_nlattr(skb, tuple);
78
79 nla_nest_end(skb, nest_parms);
80
81 return ret;
82
83 nla_put_failure:
84 return -1;
85 }
86
ctnetlink_dump_tuples_ip(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,struct nf_conntrack_l3proto * l3proto)87 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
88 const struct nf_conntrack_tuple *tuple,
89 struct nf_conntrack_l3proto *l3proto)
90 {
91 int ret = 0;
92 struct nlattr *nest_parms;
93
94 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
95 if (!nest_parms)
96 goto nla_put_failure;
97
98 if (likely(l3proto->tuple_to_nlattr))
99 ret = l3proto->tuple_to_nlattr(skb, tuple);
100
101 nla_nest_end(skb, nest_parms);
102
103 return ret;
104
105 nla_put_failure:
106 return -1;
107 }
108
ctnetlink_dump_tuples(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple)109 static int ctnetlink_dump_tuples(struct sk_buff *skb,
110 const struct nf_conntrack_tuple *tuple)
111 {
112 int ret;
113 struct nf_conntrack_l3proto *l3proto;
114 struct nf_conntrack_l4proto *l4proto;
115
116 rcu_read_lock();
117 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
118 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
119
120 if (ret >= 0) {
121 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
122 tuple->dst.protonum);
123 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
124 }
125 rcu_read_unlock();
126 return ret;
127 }
128
ctnetlink_dump_zone_id(struct sk_buff * skb,int attrtype,const struct nf_conntrack_zone * zone,int dir)129 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
130 const struct nf_conntrack_zone *zone, int dir)
131 {
132 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
133 return 0;
134 if (nla_put_be16(skb, attrtype, htons(zone->id)))
135 goto nla_put_failure;
136 return 0;
137
138 nla_put_failure:
139 return -1;
140 }
141
ctnetlink_dump_status(struct sk_buff * skb,const struct nf_conn * ct)142 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
143 {
144 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
145 goto nla_put_failure;
146 return 0;
147
148 nla_put_failure:
149 return -1;
150 }
151
ctnetlink_dump_timeout(struct sk_buff * skb,const struct nf_conn * ct)152 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
153 {
154 long timeout = nf_ct_expires(ct) / HZ;
155
156 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
157 goto nla_put_failure;
158 return 0;
159
160 nla_put_failure:
161 return -1;
162 }
163
ctnetlink_dump_protoinfo(struct sk_buff * skb,struct nf_conn * ct)164 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
165 {
166 struct nf_conntrack_l4proto *l4proto;
167 struct nlattr *nest_proto;
168 int ret;
169
170 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
171 if (!l4proto->to_nlattr)
172 return 0;
173
174 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
175 if (!nest_proto)
176 goto nla_put_failure;
177
178 ret = l4proto->to_nlattr(skb, nest_proto, ct);
179
180 nla_nest_end(skb, nest_proto);
181
182 return ret;
183
184 nla_put_failure:
185 return -1;
186 }
187
ctnetlink_dump_helpinfo(struct sk_buff * skb,const struct nf_conn * ct)188 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
189 const struct nf_conn *ct)
190 {
191 struct nlattr *nest_helper;
192 const struct nf_conn_help *help = nfct_help(ct);
193 struct nf_conntrack_helper *helper;
194
195 if (!help)
196 return 0;
197
198 helper = rcu_dereference(help->helper);
199 if (!helper)
200 goto out;
201
202 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
203 if (!nest_helper)
204 goto nla_put_failure;
205 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
206 goto nla_put_failure;
207
208 if (helper->to_nlattr)
209 helper->to_nlattr(skb, ct);
210
211 nla_nest_end(skb, nest_helper);
212 out:
213 return 0;
214
215 nla_put_failure:
216 return -1;
217 }
218
219 static int
dump_counters(struct sk_buff * skb,struct nf_conn_acct * acct,enum ip_conntrack_dir dir,int type)220 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
221 enum ip_conntrack_dir dir, int type)
222 {
223 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
224 struct nf_conn_counter *counter = acct->counter;
225 struct nlattr *nest_count;
226 u64 pkts, bytes;
227
228 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
229 pkts = atomic64_xchg(&counter[dir].packets, 0);
230 bytes = atomic64_xchg(&counter[dir].bytes, 0);
231 } else {
232 pkts = atomic64_read(&counter[dir].packets);
233 bytes = atomic64_read(&counter[dir].bytes);
234 }
235
236 nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
237 if (!nest_count)
238 goto nla_put_failure;
239
240 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
241 CTA_COUNTERS_PAD) ||
242 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
243 CTA_COUNTERS_PAD))
244 goto nla_put_failure;
245
246 nla_nest_end(skb, nest_count);
247
248 return 0;
249
250 nla_put_failure:
251 return -1;
252 }
253
254 static int
ctnetlink_dump_acct(struct sk_buff * skb,const struct nf_conn * ct,int type)255 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
256 {
257 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
258
259 if (!acct)
260 return 0;
261
262 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
263 return -1;
264 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
265 return -1;
266
267 return 0;
268 }
269
270 static int
ctnetlink_dump_timestamp(struct sk_buff * skb,const struct nf_conn * ct)271 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
272 {
273 struct nlattr *nest_count;
274 const struct nf_conn_tstamp *tstamp;
275
276 tstamp = nf_conn_tstamp_find(ct);
277 if (!tstamp)
278 return 0;
279
280 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
281 if (!nest_count)
282 goto nla_put_failure;
283
284 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
285 CTA_TIMESTAMP_PAD) ||
286 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
287 cpu_to_be64(tstamp->stop),
288 CTA_TIMESTAMP_PAD)))
289 goto nla_put_failure;
290 nla_nest_end(skb, nest_count);
291
292 return 0;
293
294 nla_put_failure:
295 return -1;
296 }
297
298 #ifdef CONFIG_NF_CONNTRACK_MARK
ctnetlink_dump_mark(struct sk_buff * skb,const struct nf_conn * ct)299 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
300 {
301 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
302 goto nla_put_failure;
303 return 0;
304
305 nla_put_failure:
306 return -1;
307 }
308 #else
309 #define ctnetlink_dump_mark(a, b) (0)
310 #endif
311
312 #ifdef CONFIG_NF_CONNTRACK_SECMARK
ctnetlink_dump_secctx(struct sk_buff * skb,const struct nf_conn * ct)313 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
314 {
315 struct nlattr *nest_secctx;
316 int len, ret;
317 char *secctx;
318
319 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
320 if (ret)
321 return 0;
322
323 ret = -1;
324 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
325 if (!nest_secctx)
326 goto nla_put_failure;
327
328 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
329 goto nla_put_failure;
330 nla_nest_end(skb, nest_secctx);
331
332 ret = 0;
333 nla_put_failure:
334 security_release_secctx(secctx, len);
335 return ret;
336 }
337 #else
338 #define ctnetlink_dump_secctx(a, b) (0)
339 #endif
340
341 #ifdef CONFIG_NF_CONNTRACK_LABELS
ctnetlink_label_size(const struct nf_conn * ct)342 static inline int ctnetlink_label_size(const struct nf_conn *ct)
343 {
344 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
345
346 if (!labels)
347 return 0;
348 return nla_total_size(sizeof(labels->bits));
349 }
350
351 static int
ctnetlink_dump_labels(struct sk_buff * skb,const struct nf_conn * ct)352 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
353 {
354 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
355 unsigned int i;
356
357 if (!labels)
358 return 0;
359
360 i = 0;
361 do {
362 if (labels->bits[i] != 0)
363 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
364 labels->bits);
365 i++;
366 } while (i < ARRAY_SIZE(labels->bits));
367
368 return 0;
369 }
370 #else
371 #define ctnetlink_dump_labels(a, b) (0)
372 #define ctnetlink_label_size(a) (0)
373 #endif
374
375 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
376
ctnetlink_dump_master(struct sk_buff * skb,const struct nf_conn * ct)377 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
378 {
379 struct nlattr *nest_parms;
380
381 if (!(ct->status & IPS_EXPECTED))
382 return 0;
383
384 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
385 if (!nest_parms)
386 goto nla_put_failure;
387 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
388 goto nla_put_failure;
389 nla_nest_end(skb, nest_parms);
390
391 return 0;
392
393 nla_put_failure:
394 return -1;
395 }
396
397 static int
dump_ct_seq_adj(struct sk_buff * skb,const struct nf_ct_seqadj * seq,int type)398 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
399 {
400 struct nlattr *nest_parms;
401
402 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
403 if (!nest_parms)
404 goto nla_put_failure;
405
406 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
407 htonl(seq->correction_pos)) ||
408 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
409 htonl(seq->offset_before)) ||
410 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
411 htonl(seq->offset_after)))
412 goto nla_put_failure;
413
414 nla_nest_end(skb, nest_parms);
415
416 return 0;
417
418 nla_put_failure:
419 return -1;
420 }
421
ctnetlink_dump_ct_seq_adj(struct sk_buff * skb,const struct nf_conn * ct)422 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb,
423 const struct nf_conn *ct)
424 {
425 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
426 struct nf_ct_seqadj *seq;
427
428 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
429 return 0;
430
431 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
432 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
433 return -1;
434
435 seq = &seqadj->seq[IP_CT_DIR_REPLY];
436 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
437 return -1;
438
439 return 0;
440 }
441
ctnetlink_dump_id(struct sk_buff * skb,const struct nf_conn * ct)442 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
443 {
444 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
445 goto nla_put_failure;
446 return 0;
447
448 nla_put_failure:
449 return -1;
450 }
451
ctnetlink_dump_use(struct sk_buff * skb,const struct nf_conn * ct)452 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
453 {
454 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
455 goto nla_put_failure;
456 return 0;
457
458 nla_put_failure:
459 return -1;
460 }
461
462 static int
ctnetlink_fill_info(struct sk_buff * skb,u32 portid,u32 seq,u32 type,struct nf_conn * ct)463 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
464 struct nf_conn *ct)
465 {
466 const struct nf_conntrack_zone *zone;
467 struct nlmsghdr *nlh;
468 struct nfgenmsg *nfmsg;
469 struct nlattr *nest_parms;
470 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
471
472 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
473 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
474 if (nlh == NULL)
475 goto nlmsg_failure;
476
477 nfmsg = nlmsg_data(nlh);
478 nfmsg->nfgen_family = nf_ct_l3num(ct);
479 nfmsg->version = NFNETLINK_V0;
480 nfmsg->res_id = 0;
481
482 zone = nf_ct_zone(ct);
483
484 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
485 if (!nest_parms)
486 goto nla_put_failure;
487 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
488 goto nla_put_failure;
489 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
490 NF_CT_ZONE_DIR_ORIG) < 0)
491 goto nla_put_failure;
492 nla_nest_end(skb, nest_parms);
493
494 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
495 if (!nest_parms)
496 goto nla_put_failure;
497 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
498 goto nla_put_failure;
499 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
500 NF_CT_ZONE_DIR_REPL) < 0)
501 goto nla_put_failure;
502 nla_nest_end(skb, nest_parms);
503
504 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
505 NF_CT_DEFAULT_ZONE_DIR) < 0)
506 goto nla_put_failure;
507
508 if (ctnetlink_dump_status(skb, ct) < 0 ||
509 ctnetlink_dump_timeout(skb, ct) < 0 ||
510 ctnetlink_dump_acct(skb, ct, type) < 0 ||
511 ctnetlink_dump_timestamp(skb, ct) < 0 ||
512 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
513 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
514 ctnetlink_dump_mark(skb, ct) < 0 ||
515 ctnetlink_dump_secctx(skb, ct) < 0 ||
516 ctnetlink_dump_labels(skb, ct) < 0 ||
517 ctnetlink_dump_id(skb, ct) < 0 ||
518 ctnetlink_dump_use(skb, ct) < 0 ||
519 ctnetlink_dump_master(skb, ct) < 0 ||
520 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
521 goto nla_put_failure;
522
523 nlmsg_end(skb, nlh);
524 return skb->len;
525
526 nlmsg_failure:
527 nla_put_failure:
528 nlmsg_cancel(skb, nlh);
529 return -1;
530 }
531
ctnetlink_proto_size(const struct nf_conn * ct)532 static inline size_t ctnetlink_proto_size(const struct nf_conn *ct)
533 {
534 struct nf_conntrack_l3proto *l3proto;
535 struct nf_conntrack_l4proto *l4proto;
536 size_t len = 0;
537
538 rcu_read_lock();
539 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
540 len += l3proto->nla_size;
541
542 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
543 len += l4proto->nla_size;
544 rcu_read_unlock();
545
546 return len;
547 }
548
ctnetlink_acct_size(const struct nf_conn * ct)549 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
550 {
551 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
552 return 0;
553 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
554 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
555 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
556 ;
557 }
558
ctnetlink_secctx_size(const struct nf_conn * ct)559 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
560 {
561 #ifdef CONFIG_NF_CONNTRACK_SECMARK
562 int len, ret;
563
564 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
565 if (ret)
566 return 0;
567
568 return nla_total_size(0) /* CTA_SECCTX */
569 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
570 #else
571 return 0;
572 #endif
573 }
574
ctnetlink_timestamp_size(const struct nf_conn * ct)575 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
576 {
577 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
578 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
579 return 0;
580 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
581 #else
582 return 0;
583 #endif
584 }
585
586 #ifdef CONFIG_NF_CONNTRACK_EVENTS
ctnetlink_nlmsg_size(const struct nf_conn * ct)587 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
588 {
589 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
590 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
591 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
592 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
593 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
594 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
595 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
596 + ctnetlink_acct_size(ct)
597 + ctnetlink_timestamp_size(ct)
598 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
599 + nla_total_size(0) /* CTA_PROTOINFO */
600 + nla_total_size(0) /* CTA_HELP */
601 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
602 + ctnetlink_secctx_size(ct)
603 #ifdef CONFIG_NF_NAT_NEEDED
604 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
605 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
606 #endif
607 #ifdef CONFIG_NF_CONNTRACK_MARK
608 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
609 #endif
610 #ifdef CONFIG_NF_CONNTRACK_ZONES
611 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
612 #endif
613 + ctnetlink_proto_size(ct)
614 + ctnetlink_label_size(ct)
615 ;
616 }
617
618 static int
ctnetlink_conntrack_event(unsigned int events,struct nf_ct_event * item)619 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
620 {
621 const struct nf_conntrack_zone *zone;
622 struct net *net;
623 struct nlmsghdr *nlh;
624 struct nfgenmsg *nfmsg;
625 struct nlattr *nest_parms;
626 struct nf_conn *ct = item->ct;
627 struct sk_buff *skb;
628 unsigned int type;
629 unsigned int flags = 0, group;
630 int err;
631
632 /* ignore our fake conntrack entry */
633 if (nf_ct_is_untracked(ct))
634 return 0;
635
636 if (events & (1 << IPCT_DESTROY)) {
637 type = IPCTNL_MSG_CT_DELETE;
638 group = NFNLGRP_CONNTRACK_DESTROY;
639 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
640 type = IPCTNL_MSG_CT_NEW;
641 flags = NLM_F_CREATE|NLM_F_EXCL;
642 group = NFNLGRP_CONNTRACK_NEW;
643 } else if (events) {
644 type = IPCTNL_MSG_CT_NEW;
645 group = NFNLGRP_CONNTRACK_UPDATE;
646 } else
647 return 0;
648
649 net = nf_ct_net(ct);
650 if (!item->report && !nfnetlink_has_listeners(net, group))
651 return 0;
652
653 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
654 if (skb == NULL)
655 goto errout;
656
657 type |= NFNL_SUBSYS_CTNETLINK << 8;
658 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
659 if (nlh == NULL)
660 goto nlmsg_failure;
661
662 nfmsg = nlmsg_data(nlh);
663 nfmsg->nfgen_family = nf_ct_l3num(ct);
664 nfmsg->version = NFNETLINK_V0;
665 nfmsg->res_id = 0;
666
667 rcu_read_lock();
668 zone = nf_ct_zone(ct);
669
670 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
671 if (!nest_parms)
672 goto nla_put_failure;
673 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
674 goto nla_put_failure;
675 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
676 NF_CT_ZONE_DIR_ORIG) < 0)
677 goto nla_put_failure;
678 nla_nest_end(skb, nest_parms);
679
680 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
681 if (!nest_parms)
682 goto nla_put_failure;
683 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
684 goto nla_put_failure;
685 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
686 NF_CT_ZONE_DIR_REPL) < 0)
687 goto nla_put_failure;
688 nla_nest_end(skb, nest_parms);
689
690 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
691 NF_CT_DEFAULT_ZONE_DIR) < 0)
692 goto nla_put_failure;
693
694 if (ctnetlink_dump_id(skb, ct) < 0)
695 goto nla_put_failure;
696
697 if (ctnetlink_dump_status(skb, ct) < 0)
698 goto nla_put_failure;
699
700 if (events & (1 << IPCT_DESTROY)) {
701 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
702 ctnetlink_dump_timestamp(skb, ct) < 0)
703 goto nla_put_failure;
704 } else {
705 if (ctnetlink_dump_timeout(skb, ct) < 0)
706 goto nla_put_failure;
707
708 if (events & (1 << IPCT_PROTOINFO)
709 && ctnetlink_dump_protoinfo(skb, ct) < 0)
710 goto nla_put_failure;
711
712 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
713 && ctnetlink_dump_helpinfo(skb, ct) < 0)
714 goto nla_put_failure;
715
716 #ifdef CONFIG_NF_CONNTRACK_SECMARK
717 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
718 && ctnetlink_dump_secctx(skb, ct) < 0)
719 goto nla_put_failure;
720 #endif
721 if (events & (1 << IPCT_LABEL) &&
722 ctnetlink_dump_labels(skb, ct) < 0)
723 goto nla_put_failure;
724
725 if (events & (1 << IPCT_RELATED) &&
726 ctnetlink_dump_master(skb, ct) < 0)
727 goto nla_put_failure;
728
729 if (events & (1 << IPCT_SEQADJ) &&
730 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
731 goto nla_put_failure;
732 }
733
734 #ifdef CONFIG_NF_CONNTRACK_MARK
735 if ((events & (1 << IPCT_MARK) || ct->mark)
736 && ctnetlink_dump_mark(skb, ct) < 0)
737 goto nla_put_failure;
738 #endif
739 rcu_read_unlock();
740
741 nlmsg_end(skb, nlh);
742 err = nfnetlink_send(skb, net, item->portid, group, item->report,
743 GFP_ATOMIC);
744 if (err == -ENOBUFS || err == -EAGAIN)
745 return -ENOBUFS;
746
747 return 0;
748
749 nla_put_failure:
750 rcu_read_unlock();
751 nlmsg_cancel(skb, nlh);
752 nlmsg_failure:
753 kfree_skb(skb);
754 errout:
755 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
756 return -ENOBUFS;
757
758 return 0;
759 }
760 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
761
ctnetlink_done(struct netlink_callback * cb)762 static int ctnetlink_done(struct netlink_callback *cb)
763 {
764 if (cb->args[1])
765 nf_ct_put((struct nf_conn *)cb->args[1]);
766 kfree(cb->data);
767 return 0;
768 }
769
770 struct ctnetlink_filter {
771 struct {
772 u_int32_t val;
773 u_int32_t mask;
774 } mark;
775 };
776
777 static struct ctnetlink_filter *
ctnetlink_alloc_filter(const struct nlattr * const cda[])778 ctnetlink_alloc_filter(const struct nlattr * const cda[])
779 {
780 #ifdef CONFIG_NF_CONNTRACK_MARK
781 struct ctnetlink_filter *filter;
782
783 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
784 if (filter == NULL)
785 return ERR_PTR(-ENOMEM);
786
787 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
788 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
789
790 return filter;
791 #else
792 return ERR_PTR(-EOPNOTSUPP);
793 #endif
794 }
795
ctnetlink_filter_match(struct nf_conn * ct,void * data)796 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
797 {
798 struct ctnetlink_filter *filter = data;
799
800 if (filter == NULL)
801 return 1;
802
803 #ifdef CONFIG_NF_CONNTRACK_MARK
804 if ((ct->mark & filter->mark.mask) == filter->mark.val)
805 return 1;
806 #endif
807
808 return 0;
809 }
810
811 static int
ctnetlink_dump_table(struct sk_buff * skb,struct netlink_callback * cb)812 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
813 {
814 struct net *net = sock_net(skb->sk);
815 struct nf_conn *ct, *last;
816 struct nf_conntrack_tuple_hash *h;
817 struct hlist_nulls_node *n;
818 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
819 u_int8_t l3proto = nfmsg->nfgen_family;
820 struct nf_conn *nf_ct_evict[8];
821 int res, i;
822 spinlock_t *lockp;
823
824 last = (struct nf_conn *)cb->args[1];
825 i = 0;
826
827 local_bh_disable();
828 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
829 restart:
830 while (i) {
831 i--;
832 if (nf_ct_should_gc(nf_ct_evict[i]))
833 nf_ct_kill(nf_ct_evict[i]);
834 nf_ct_put(nf_ct_evict[i]);
835 }
836
837 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
838 nf_conntrack_lock(lockp);
839 if (cb->args[0] >= nf_conntrack_htable_size) {
840 spin_unlock(lockp);
841 goto out;
842 }
843 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
844 hnnode) {
845 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
846 continue;
847 ct = nf_ct_tuplehash_to_ctrack(h);
848 if (nf_ct_is_expired(ct)) {
849 if (i < ARRAY_SIZE(nf_ct_evict) &&
850 atomic_inc_not_zero(&ct->ct_general.use))
851 nf_ct_evict[i++] = ct;
852 continue;
853 }
854
855 if (!net_eq(net, nf_ct_net(ct)))
856 continue;
857
858 /* Dump entries of a given L3 protocol number.
859 * If it is not specified, ie. l3proto == 0,
860 * then dump everything. */
861 if (l3proto && nf_ct_l3num(ct) != l3proto)
862 continue;
863 if (cb->args[1]) {
864 if (ct != last)
865 continue;
866 cb->args[1] = 0;
867 }
868 if (!ctnetlink_filter_match(ct, cb->data))
869 continue;
870
871 rcu_read_lock();
872 res =
873 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
874 cb->nlh->nlmsg_seq,
875 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
876 ct);
877 rcu_read_unlock();
878 if (res < 0) {
879 nf_conntrack_get(&ct->ct_general);
880 cb->args[1] = (unsigned long)ct;
881 spin_unlock(lockp);
882 goto out;
883 }
884 }
885 spin_unlock(lockp);
886 if (cb->args[1]) {
887 cb->args[1] = 0;
888 goto restart;
889 }
890 }
891 out:
892 local_bh_enable();
893 if (last) {
894 /* nf ct hash resize happened, now clear the leftover. */
895 if ((struct nf_conn *)cb->args[1] == last)
896 cb->args[1] = 0;
897
898 nf_ct_put(last);
899 }
900
901 while (i) {
902 i--;
903 if (nf_ct_should_gc(nf_ct_evict[i]))
904 nf_ct_kill(nf_ct_evict[i]);
905 nf_ct_put(nf_ct_evict[i]);
906 }
907
908 return skb->len;
909 }
910
ctnetlink_parse_tuple_ip(struct nlattr * attr,struct nf_conntrack_tuple * tuple)911 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
912 struct nf_conntrack_tuple *tuple)
913 {
914 struct nlattr *tb[CTA_IP_MAX+1];
915 struct nf_conntrack_l3proto *l3proto;
916 int ret = 0;
917
918 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
919 if (ret < 0)
920 return ret;
921
922 rcu_read_lock();
923 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
924
925 if (likely(l3proto->nlattr_to_tuple)) {
926 ret = nla_validate_nested(attr, CTA_IP_MAX,
927 l3proto->nla_policy);
928 if (ret == 0)
929 ret = l3proto->nlattr_to_tuple(tb, tuple);
930 }
931
932 rcu_read_unlock();
933
934 return ret;
935 }
936
937 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
938 [CTA_PROTO_NUM] = { .type = NLA_U8 },
939 };
940
ctnetlink_parse_tuple_proto(struct nlattr * attr,struct nf_conntrack_tuple * tuple)941 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
942 struct nf_conntrack_tuple *tuple)
943 {
944 struct nlattr *tb[CTA_PROTO_MAX+1];
945 struct nf_conntrack_l4proto *l4proto;
946 int ret = 0;
947
948 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
949 if (ret < 0)
950 return ret;
951
952 if (!tb[CTA_PROTO_NUM])
953 return -EINVAL;
954 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
955
956 rcu_read_lock();
957 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
958
959 if (likely(l4proto->nlattr_to_tuple)) {
960 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
961 l4proto->nla_policy);
962 if (ret == 0)
963 ret = l4proto->nlattr_to_tuple(tb, tuple);
964 }
965
966 rcu_read_unlock();
967
968 return ret;
969 }
970
971 static int
ctnetlink_parse_zone(const struct nlattr * attr,struct nf_conntrack_zone * zone)972 ctnetlink_parse_zone(const struct nlattr *attr,
973 struct nf_conntrack_zone *zone)
974 {
975 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
976 NF_CT_DEFAULT_ZONE_DIR, 0);
977 #ifdef CONFIG_NF_CONNTRACK_ZONES
978 if (attr)
979 zone->id = ntohs(nla_get_be16(attr));
980 #else
981 if (attr)
982 return -EOPNOTSUPP;
983 #endif
984 return 0;
985 }
986
987 static int
ctnetlink_parse_tuple_zone(struct nlattr * attr,enum ctattr_type type,struct nf_conntrack_zone * zone)988 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
989 struct nf_conntrack_zone *zone)
990 {
991 int ret;
992
993 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
994 return -EINVAL;
995
996 ret = ctnetlink_parse_zone(attr, zone);
997 if (ret < 0)
998 return ret;
999
1000 if (type == CTA_TUPLE_REPLY)
1001 zone->dir = NF_CT_ZONE_DIR_REPL;
1002 else
1003 zone->dir = NF_CT_ZONE_DIR_ORIG;
1004
1005 return 0;
1006 }
1007
1008 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1009 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1010 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1011 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1012 };
1013
1014 static int
ctnetlink_parse_tuple(const struct nlattr * const cda[],struct nf_conntrack_tuple * tuple,u32 type,u_int8_t l3num,struct nf_conntrack_zone * zone)1015 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1016 struct nf_conntrack_tuple *tuple, u32 type,
1017 u_int8_t l3num, struct nf_conntrack_zone *zone)
1018 {
1019 struct nlattr *tb[CTA_TUPLE_MAX+1];
1020 int err;
1021
1022 memset(tuple, 0, sizeof(*tuple));
1023
1024 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
1025 if (err < 0)
1026 return err;
1027
1028 if (!tb[CTA_TUPLE_IP])
1029 return -EINVAL;
1030
1031 tuple->src.l3num = l3num;
1032
1033 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1034 if (err < 0)
1035 return err;
1036
1037 if (!tb[CTA_TUPLE_PROTO])
1038 return -EINVAL;
1039
1040 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1041 if (err < 0)
1042 return err;
1043
1044 if (tb[CTA_TUPLE_ZONE]) {
1045 if (!zone)
1046 return -EINVAL;
1047
1048 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1049 type, zone);
1050 if (err < 0)
1051 return err;
1052 }
1053
1054 /* orig and expect tuples get DIR_ORIGINAL */
1055 if (type == CTA_TUPLE_REPLY)
1056 tuple->dst.dir = IP_CT_DIR_REPLY;
1057 else
1058 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1059
1060 return 0;
1061 }
1062
1063 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1064 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1065 .len = NF_CT_HELPER_NAME_LEN - 1 },
1066 };
1067
ctnetlink_parse_help(const struct nlattr * attr,char ** helper_name,struct nlattr ** helpinfo)1068 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1069 struct nlattr **helpinfo)
1070 {
1071 int err;
1072 struct nlattr *tb[CTA_HELP_MAX+1];
1073
1074 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
1075 if (err < 0)
1076 return err;
1077
1078 if (!tb[CTA_HELP_NAME])
1079 return -EINVAL;
1080
1081 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1082
1083 if (tb[CTA_HELP_INFO])
1084 *helpinfo = tb[CTA_HELP_INFO];
1085
1086 return 0;
1087 }
1088
1089 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1090 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1091 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1092 [CTA_STATUS] = { .type = NLA_U32 },
1093 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1094 [CTA_HELP] = { .type = NLA_NESTED },
1095 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1096 [CTA_TIMEOUT] = { .type = NLA_U32 },
1097 [CTA_MARK] = { .type = NLA_U32 },
1098 [CTA_ID] = { .type = NLA_U32 },
1099 [CTA_NAT_DST] = { .type = NLA_NESTED },
1100 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1101 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1102 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1103 [CTA_ZONE] = { .type = NLA_U16 },
1104 [CTA_MARK_MASK] = { .type = NLA_U32 },
1105 [CTA_LABELS] = { .type = NLA_BINARY,
1106 .len = NF_CT_LABELS_MAX_SIZE },
1107 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1108 .len = NF_CT_LABELS_MAX_SIZE },
1109 };
1110
ctnetlink_flush_conntrack(struct net * net,const struct nlattr * const cda[],u32 portid,int report)1111 static int ctnetlink_flush_conntrack(struct net *net,
1112 const struct nlattr * const cda[],
1113 u32 portid, int report)
1114 {
1115 struct ctnetlink_filter *filter = NULL;
1116
1117 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1118 filter = ctnetlink_alloc_filter(cda);
1119 if (IS_ERR(filter))
1120 return PTR_ERR(filter);
1121 }
1122
1123 nf_ct_iterate_cleanup(net, ctnetlink_filter_match, filter,
1124 portid, report);
1125 kfree(filter);
1126
1127 return 0;
1128 }
1129
ctnetlink_del_conntrack(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])1130 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1131 struct sk_buff *skb,
1132 const struct nlmsghdr *nlh,
1133 const struct nlattr * const cda[])
1134 {
1135 struct nf_conntrack_tuple_hash *h;
1136 struct nf_conntrack_tuple tuple;
1137 struct nf_conn *ct;
1138 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1139 u_int8_t u3 = nfmsg->nfgen_family;
1140 struct nf_conntrack_zone zone;
1141 int err;
1142
1143 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1144 if (err < 0)
1145 return err;
1146
1147 if (cda[CTA_TUPLE_ORIG])
1148 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1149 u3, &zone);
1150 else if (cda[CTA_TUPLE_REPLY])
1151 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1152 u3, &zone);
1153 else {
1154 return ctnetlink_flush_conntrack(net, cda,
1155 NETLINK_CB(skb).portid,
1156 nlmsg_report(nlh));
1157 }
1158
1159 if (err < 0)
1160 return err;
1161
1162 h = nf_conntrack_find_get(net, &zone, &tuple);
1163 if (!h)
1164 return -ENOENT;
1165
1166 ct = nf_ct_tuplehash_to_ctrack(h);
1167
1168 if (cda[CTA_ID]) {
1169 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1170 if (id != (u32)(unsigned long)ct) {
1171 nf_ct_put(ct);
1172 return -ENOENT;
1173 }
1174 }
1175
1176 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1177 nf_ct_put(ct);
1178
1179 return 0;
1180 }
1181
ctnetlink_get_conntrack(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])1182 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1183 struct sk_buff *skb,
1184 const struct nlmsghdr *nlh,
1185 const struct nlattr * const cda[])
1186 {
1187 struct nf_conntrack_tuple_hash *h;
1188 struct nf_conntrack_tuple tuple;
1189 struct nf_conn *ct;
1190 struct sk_buff *skb2 = NULL;
1191 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1192 u_int8_t u3 = nfmsg->nfgen_family;
1193 struct nf_conntrack_zone zone;
1194 int err;
1195
1196 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1197 struct netlink_dump_control c = {
1198 .dump = ctnetlink_dump_table,
1199 .done = ctnetlink_done,
1200 };
1201
1202 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1203 struct ctnetlink_filter *filter;
1204
1205 filter = ctnetlink_alloc_filter(cda);
1206 if (IS_ERR(filter))
1207 return PTR_ERR(filter);
1208
1209 c.data = filter;
1210 }
1211 return netlink_dump_start(ctnl, skb, nlh, &c);
1212 }
1213
1214 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1215 if (err < 0)
1216 return err;
1217
1218 if (cda[CTA_TUPLE_ORIG])
1219 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1220 u3, &zone);
1221 else if (cda[CTA_TUPLE_REPLY])
1222 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1223 u3, &zone);
1224 else
1225 return -EINVAL;
1226
1227 if (err < 0)
1228 return err;
1229
1230 h = nf_conntrack_find_get(net, &zone, &tuple);
1231 if (!h)
1232 return -ENOENT;
1233
1234 ct = nf_ct_tuplehash_to_ctrack(h);
1235
1236 err = -ENOMEM;
1237 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1238 if (skb2 == NULL) {
1239 nf_ct_put(ct);
1240 return -ENOMEM;
1241 }
1242
1243 rcu_read_lock();
1244 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1245 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1246 rcu_read_unlock();
1247 nf_ct_put(ct);
1248 if (err <= 0)
1249 goto free;
1250
1251 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1252 if (err < 0)
1253 goto out;
1254
1255 return 0;
1256
1257 free:
1258 kfree_skb(skb2);
1259 out:
1260 /* this avoids a loop in nfnetlink. */
1261 return err == -EAGAIN ? -ENOBUFS : err;
1262 }
1263
ctnetlink_done_list(struct netlink_callback * cb)1264 static int ctnetlink_done_list(struct netlink_callback *cb)
1265 {
1266 if (cb->args[1])
1267 nf_ct_put((struct nf_conn *)cb->args[1]);
1268 return 0;
1269 }
1270
1271 static int
ctnetlink_dump_list(struct sk_buff * skb,struct netlink_callback * cb,bool dying)1272 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1273 {
1274 struct nf_conn *ct, *last;
1275 struct nf_conntrack_tuple_hash *h;
1276 struct hlist_nulls_node *n;
1277 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1278 u_int8_t l3proto = nfmsg->nfgen_family;
1279 int res;
1280 int cpu;
1281 struct hlist_nulls_head *list;
1282 struct net *net = sock_net(skb->sk);
1283
1284 if (cb->args[2])
1285 return 0;
1286
1287 last = (struct nf_conn *)cb->args[1];
1288
1289 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1290 struct ct_pcpu *pcpu;
1291
1292 if (!cpu_possible(cpu))
1293 continue;
1294
1295 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1296 spin_lock_bh(&pcpu->lock);
1297 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1298 restart:
1299 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1300 ct = nf_ct_tuplehash_to_ctrack(h);
1301 if (l3proto && nf_ct_l3num(ct) != l3proto)
1302 continue;
1303 if (cb->args[1]) {
1304 if (ct != last)
1305 continue;
1306 cb->args[1] = 0;
1307 }
1308 rcu_read_lock();
1309 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1310 cb->nlh->nlmsg_seq,
1311 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1312 ct);
1313 rcu_read_unlock();
1314 if (res < 0) {
1315 if (!atomic_inc_not_zero(&ct->ct_general.use))
1316 continue;
1317 cb->args[0] = cpu;
1318 cb->args[1] = (unsigned long)ct;
1319 spin_unlock_bh(&pcpu->lock);
1320 goto out;
1321 }
1322 }
1323 if (cb->args[1]) {
1324 cb->args[1] = 0;
1325 goto restart;
1326 }
1327 spin_unlock_bh(&pcpu->lock);
1328 }
1329 cb->args[2] = 1;
1330 out:
1331 if (last)
1332 nf_ct_put(last);
1333
1334 return skb->len;
1335 }
1336
1337 static int
ctnetlink_dump_dying(struct sk_buff * skb,struct netlink_callback * cb)1338 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1339 {
1340 return ctnetlink_dump_list(skb, cb, true);
1341 }
1342
ctnetlink_get_ct_dying(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])1343 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1344 struct sk_buff *skb,
1345 const struct nlmsghdr *nlh,
1346 const struct nlattr * const cda[])
1347 {
1348 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1349 struct netlink_dump_control c = {
1350 .dump = ctnetlink_dump_dying,
1351 .done = ctnetlink_done_list,
1352 };
1353 return netlink_dump_start(ctnl, skb, nlh, &c);
1354 }
1355
1356 return -EOPNOTSUPP;
1357 }
1358
1359 static int
ctnetlink_dump_unconfirmed(struct sk_buff * skb,struct netlink_callback * cb)1360 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1361 {
1362 return ctnetlink_dump_list(skb, cb, false);
1363 }
1364
ctnetlink_get_ct_unconfirmed(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])1365 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1366 struct sk_buff *skb,
1367 const struct nlmsghdr *nlh,
1368 const struct nlattr * const cda[])
1369 {
1370 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1371 struct netlink_dump_control c = {
1372 .dump = ctnetlink_dump_unconfirmed,
1373 .done = ctnetlink_done_list,
1374 };
1375 return netlink_dump_start(ctnl, skb, nlh, &c);
1376 }
1377
1378 return -EOPNOTSUPP;
1379 }
1380
1381 #ifdef CONFIG_NF_NAT_NEEDED
1382 static int
ctnetlink_parse_nat_setup(struct nf_conn * ct,enum nf_nat_manip_type manip,const struct nlattr * attr)1383 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1384 enum nf_nat_manip_type manip,
1385 const struct nlattr *attr)
1386 {
1387 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1388 int err;
1389
1390 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1391 if (!parse_nat_setup) {
1392 #ifdef CONFIG_MODULES
1393 rcu_read_unlock();
1394 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1395 if (request_module("nf-nat") < 0) {
1396 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1397 rcu_read_lock();
1398 return -EOPNOTSUPP;
1399 }
1400 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1401 rcu_read_lock();
1402 if (nfnetlink_parse_nat_setup_hook)
1403 return -EAGAIN;
1404 #endif
1405 return -EOPNOTSUPP;
1406 }
1407
1408 err = parse_nat_setup(ct, manip, attr);
1409 if (err == -EAGAIN) {
1410 #ifdef CONFIG_MODULES
1411 rcu_read_unlock();
1412 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1413 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1414 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1415 rcu_read_lock();
1416 return -EOPNOTSUPP;
1417 }
1418 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1419 rcu_read_lock();
1420 #else
1421 err = -EOPNOTSUPP;
1422 #endif
1423 }
1424 return err;
1425 }
1426 #endif
1427
1428 static int
ctnetlink_change_status(struct nf_conn * ct,const struct nlattr * const cda[])1429 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1430 {
1431 unsigned long d;
1432 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1433 d = ct->status ^ status;
1434
1435 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1436 /* unchangeable */
1437 return -EBUSY;
1438
1439 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1440 /* SEEN_REPLY bit can only be set */
1441 return -EBUSY;
1442
1443 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1444 /* ASSURED bit can only be set */
1445 return -EBUSY;
1446
1447 /* Be careful here, modifying NAT bits can screw up things,
1448 * so don't let users modify them directly if they don't pass
1449 * nf_nat_range. */
1450 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1451 return 0;
1452 }
1453
1454 static int
ctnetlink_setup_nat(struct nf_conn * ct,const struct nlattr * const cda[])1455 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1456 {
1457 #ifdef CONFIG_NF_NAT_NEEDED
1458 int ret;
1459
1460 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1461 return 0;
1462
1463 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1464 cda[CTA_NAT_DST]);
1465 if (ret < 0)
1466 return ret;
1467
1468 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1469 cda[CTA_NAT_SRC]);
1470 return ret;
1471 #else
1472 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1473 return 0;
1474 return -EOPNOTSUPP;
1475 #endif
1476 }
1477
ctnetlink_change_helper(struct nf_conn * ct,const struct nlattr * const cda[])1478 static int ctnetlink_change_helper(struct nf_conn *ct,
1479 const struct nlattr * const cda[])
1480 {
1481 struct nf_conntrack_helper *helper;
1482 struct nf_conn_help *help = nfct_help(ct);
1483 char *helpname = NULL;
1484 struct nlattr *helpinfo = NULL;
1485 int err;
1486
1487 /* don't change helper of sibling connections */
1488 if (ct->master)
1489 return -EBUSY;
1490
1491 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1492 if (err < 0)
1493 return err;
1494
1495 if (!strcmp(helpname, "")) {
1496 if (help && help->helper) {
1497 /* we had a helper before ... */
1498 nf_ct_remove_expectations(ct);
1499 RCU_INIT_POINTER(help->helper, NULL);
1500 }
1501
1502 return 0;
1503 }
1504
1505 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1506 nf_ct_protonum(ct));
1507 if (helper == NULL) {
1508 #ifdef CONFIG_MODULES
1509 spin_unlock_bh(&nf_conntrack_expect_lock);
1510
1511 if (request_module("nfct-helper-%s", helpname) < 0) {
1512 spin_lock_bh(&nf_conntrack_expect_lock);
1513 return -EOPNOTSUPP;
1514 }
1515
1516 spin_lock_bh(&nf_conntrack_expect_lock);
1517 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1518 nf_ct_protonum(ct));
1519 if (helper)
1520 return -EAGAIN;
1521 #endif
1522 return -EOPNOTSUPP;
1523 }
1524
1525 if (help) {
1526 if (help->helper == helper) {
1527 /* update private helper data if allowed. */
1528 if (helper->from_nlattr)
1529 helper->from_nlattr(helpinfo, ct);
1530 return 0;
1531 } else
1532 return -EBUSY;
1533 }
1534
1535 /* we cannot set a helper for an existing conntrack */
1536 return -EOPNOTSUPP;
1537 }
1538
ctnetlink_change_timeout(struct nf_conn * ct,const struct nlattr * const cda[])1539 static int ctnetlink_change_timeout(struct nf_conn *ct,
1540 const struct nlattr * const cda[])
1541 {
1542 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1543
1544 ct->timeout = nfct_time_stamp + timeout * HZ;
1545
1546 if (test_bit(IPS_DYING_BIT, &ct->status))
1547 return -ETIME;
1548
1549 return 0;
1550 }
1551
1552 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1553 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1554 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1555 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1556 };
1557
ctnetlink_change_protoinfo(struct nf_conn * ct,const struct nlattr * const cda[])1558 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1559 const struct nlattr * const cda[])
1560 {
1561 const struct nlattr *attr = cda[CTA_PROTOINFO];
1562 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1563 struct nf_conntrack_l4proto *l4proto;
1564 int err = 0;
1565
1566 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1567 if (err < 0)
1568 return err;
1569
1570 rcu_read_lock();
1571 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1572 if (l4proto->from_nlattr)
1573 err = l4proto->from_nlattr(tb, ct);
1574 rcu_read_unlock();
1575
1576 return err;
1577 }
1578
1579 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1580 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1581 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1582 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1583 };
1584
change_seq_adj(struct nf_ct_seqadj * seq,const struct nlattr * const attr)1585 static int change_seq_adj(struct nf_ct_seqadj *seq,
1586 const struct nlattr * const attr)
1587 {
1588 int err;
1589 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1590
1591 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1592 if (err < 0)
1593 return err;
1594
1595 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1596 return -EINVAL;
1597
1598 seq->correction_pos =
1599 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1600
1601 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1602 return -EINVAL;
1603
1604 seq->offset_before =
1605 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1606
1607 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1608 return -EINVAL;
1609
1610 seq->offset_after =
1611 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1612
1613 return 0;
1614 }
1615
1616 static int
ctnetlink_change_seq_adj(struct nf_conn * ct,const struct nlattr * const cda[])1617 ctnetlink_change_seq_adj(struct nf_conn *ct,
1618 const struct nlattr * const cda[])
1619 {
1620 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1621 int ret = 0;
1622
1623 if (!seqadj)
1624 return 0;
1625
1626 if (cda[CTA_SEQ_ADJ_ORIG]) {
1627 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1628 cda[CTA_SEQ_ADJ_ORIG]);
1629 if (ret < 0)
1630 return ret;
1631
1632 ct->status |= IPS_SEQ_ADJUST;
1633 }
1634
1635 if (cda[CTA_SEQ_ADJ_REPLY]) {
1636 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1637 cda[CTA_SEQ_ADJ_REPLY]);
1638 if (ret < 0)
1639 return ret;
1640
1641 ct->status |= IPS_SEQ_ADJUST;
1642 }
1643
1644 return 0;
1645 }
1646
1647 static int
ctnetlink_attach_labels(struct nf_conn * ct,const struct nlattr * const cda[])1648 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1649 {
1650 #ifdef CONFIG_NF_CONNTRACK_LABELS
1651 size_t len = nla_len(cda[CTA_LABELS]);
1652 const void *mask = cda[CTA_LABELS_MASK];
1653
1654 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1655 return -EINVAL;
1656
1657 if (mask) {
1658 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1659 nla_len(cda[CTA_LABELS_MASK]) != len)
1660 return -EINVAL;
1661 mask = nla_data(cda[CTA_LABELS_MASK]);
1662 }
1663
1664 len /= sizeof(u32);
1665
1666 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1667 #else
1668 return -EOPNOTSUPP;
1669 #endif
1670 }
1671
1672 static int
ctnetlink_change_conntrack(struct nf_conn * ct,const struct nlattr * const cda[])1673 ctnetlink_change_conntrack(struct nf_conn *ct,
1674 const struct nlattr * const cda[])
1675 {
1676 int err;
1677
1678 /* only allow NAT changes and master assignation for new conntracks */
1679 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1680 return -EOPNOTSUPP;
1681
1682 if (cda[CTA_HELP]) {
1683 err = ctnetlink_change_helper(ct, cda);
1684 if (err < 0)
1685 return err;
1686 }
1687
1688 if (cda[CTA_TIMEOUT]) {
1689 err = ctnetlink_change_timeout(ct, cda);
1690 if (err < 0)
1691 return err;
1692 }
1693
1694 if (cda[CTA_STATUS]) {
1695 err = ctnetlink_change_status(ct, cda);
1696 if (err < 0)
1697 return err;
1698 }
1699
1700 if (cda[CTA_PROTOINFO]) {
1701 err = ctnetlink_change_protoinfo(ct, cda);
1702 if (err < 0)
1703 return err;
1704 }
1705
1706 #if defined(CONFIG_NF_CONNTRACK_MARK)
1707 if (cda[CTA_MARK])
1708 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1709 #endif
1710
1711 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1712 err = ctnetlink_change_seq_adj(ct, cda);
1713 if (err < 0)
1714 return err;
1715 }
1716
1717 if (cda[CTA_LABELS]) {
1718 err = ctnetlink_attach_labels(ct, cda);
1719 if (err < 0)
1720 return err;
1721 }
1722
1723 return 0;
1724 }
1725
1726 static struct nf_conn *
ctnetlink_create_conntrack(struct net * net,const struct nf_conntrack_zone * zone,const struct nlattr * const cda[],struct nf_conntrack_tuple * otuple,struct nf_conntrack_tuple * rtuple,u8 u3)1727 ctnetlink_create_conntrack(struct net *net,
1728 const struct nf_conntrack_zone *zone,
1729 const struct nlattr * const cda[],
1730 struct nf_conntrack_tuple *otuple,
1731 struct nf_conntrack_tuple *rtuple,
1732 u8 u3)
1733 {
1734 struct nf_conn *ct;
1735 int err = -EINVAL;
1736 struct nf_conntrack_helper *helper;
1737 struct nf_conn_tstamp *tstamp;
1738
1739 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1740 if (IS_ERR(ct))
1741 return ERR_PTR(-ENOMEM);
1742
1743 if (!cda[CTA_TIMEOUT])
1744 goto err1;
1745
1746 ct->timeout = nfct_time_stamp + ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1747
1748 rcu_read_lock();
1749 if (cda[CTA_HELP]) {
1750 char *helpname = NULL;
1751 struct nlattr *helpinfo = NULL;
1752
1753 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1754 if (err < 0)
1755 goto err2;
1756
1757 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1758 nf_ct_protonum(ct));
1759 if (helper == NULL) {
1760 rcu_read_unlock();
1761 #ifdef CONFIG_MODULES
1762 if (request_module("nfct-helper-%s", helpname) < 0) {
1763 err = -EOPNOTSUPP;
1764 goto err1;
1765 }
1766
1767 rcu_read_lock();
1768 helper = __nf_conntrack_helper_find(helpname,
1769 nf_ct_l3num(ct),
1770 nf_ct_protonum(ct));
1771 if (helper) {
1772 err = -EAGAIN;
1773 goto err2;
1774 }
1775 rcu_read_unlock();
1776 #endif
1777 err = -EOPNOTSUPP;
1778 goto err1;
1779 } else {
1780 struct nf_conn_help *help;
1781
1782 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1783 if (help == NULL) {
1784 err = -ENOMEM;
1785 goto err2;
1786 }
1787 /* set private helper data if allowed. */
1788 if (helper->from_nlattr)
1789 helper->from_nlattr(helpinfo, ct);
1790
1791 /* not in hash table yet so not strictly necessary */
1792 RCU_INIT_POINTER(help->helper, helper);
1793 }
1794 } else {
1795 /* try an implicit helper assignation */
1796 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1797 if (err < 0)
1798 goto err2;
1799 }
1800
1801 err = ctnetlink_setup_nat(ct, cda);
1802 if (err < 0)
1803 goto err2;
1804
1805 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1806 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1807 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1808 nf_ct_labels_ext_add(ct);
1809 nfct_seqadj_ext_add(ct);
1810 nfct_synproxy_ext_add(ct);
1811
1812 /* we must add conntrack extensions before confirmation. */
1813 ct->status |= IPS_CONFIRMED;
1814
1815 if (cda[CTA_STATUS]) {
1816 err = ctnetlink_change_status(ct, cda);
1817 if (err < 0)
1818 goto err2;
1819 }
1820
1821 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1822 err = ctnetlink_change_seq_adj(ct, cda);
1823 if (err < 0)
1824 goto err2;
1825 }
1826
1827 memset(&ct->proto, 0, sizeof(ct->proto));
1828 if (cda[CTA_PROTOINFO]) {
1829 err = ctnetlink_change_protoinfo(ct, cda);
1830 if (err < 0)
1831 goto err2;
1832 }
1833
1834 #if defined(CONFIG_NF_CONNTRACK_MARK)
1835 if (cda[CTA_MARK])
1836 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1837 #endif
1838
1839 /* setup master conntrack: this is a confirmed expectation */
1840 if (cda[CTA_TUPLE_MASTER]) {
1841 struct nf_conntrack_tuple master;
1842 struct nf_conntrack_tuple_hash *master_h;
1843 struct nf_conn *master_ct;
1844
1845 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
1846 u3, NULL);
1847 if (err < 0)
1848 goto err2;
1849
1850 master_h = nf_conntrack_find_get(net, zone, &master);
1851 if (master_h == NULL) {
1852 err = -ENOENT;
1853 goto err2;
1854 }
1855 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1856 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1857 ct->master = master_ct;
1858 }
1859 tstamp = nf_conn_tstamp_find(ct);
1860 if (tstamp)
1861 tstamp->start = ktime_get_real_ns();
1862
1863 err = nf_conntrack_hash_check_insert(ct);
1864 if (err < 0)
1865 goto err2;
1866
1867 rcu_read_unlock();
1868
1869 return ct;
1870
1871 err2:
1872 rcu_read_unlock();
1873 err1:
1874 nf_conntrack_free(ct);
1875 return ERR_PTR(err);
1876 }
1877
ctnetlink_new_conntrack(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])1878 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
1879 struct sk_buff *skb,
1880 const struct nlmsghdr *nlh,
1881 const struct nlattr * const cda[])
1882 {
1883 struct nf_conntrack_tuple otuple, rtuple;
1884 struct nf_conntrack_tuple_hash *h = NULL;
1885 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1886 struct nf_conn *ct;
1887 u_int8_t u3 = nfmsg->nfgen_family;
1888 struct nf_conntrack_zone zone;
1889 int err;
1890
1891 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1892 if (err < 0)
1893 return err;
1894
1895 if (cda[CTA_TUPLE_ORIG]) {
1896 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
1897 u3, &zone);
1898 if (err < 0)
1899 return err;
1900 }
1901
1902 if (cda[CTA_TUPLE_REPLY]) {
1903 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
1904 u3, &zone);
1905 if (err < 0)
1906 return err;
1907 }
1908
1909 if (cda[CTA_TUPLE_ORIG])
1910 h = nf_conntrack_find_get(net, &zone, &otuple);
1911 else if (cda[CTA_TUPLE_REPLY])
1912 h = nf_conntrack_find_get(net, &zone, &rtuple);
1913
1914 if (h == NULL) {
1915 err = -ENOENT;
1916 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1917 enum ip_conntrack_events events;
1918
1919 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1920 return -EINVAL;
1921 if (otuple.dst.protonum != rtuple.dst.protonum)
1922 return -EINVAL;
1923
1924 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
1925 &rtuple, u3);
1926 if (IS_ERR(ct))
1927 return PTR_ERR(ct);
1928
1929 err = 0;
1930 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1931 events = IPCT_RELATED;
1932 else
1933 events = IPCT_NEW;
1934
1935 if (cda[CTA_LABELS] &&
1936 ctnetlink_attach_labels(ct, cda) == 0)
1937 events |= (1 << IPCT_LABEL);
1938
1939 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1940 (1 << IPCT_ASSURED) |
1941 (1 << IPCT_HELPER) |
1942 (1 << IPCT_PROTOINFO) |
1943 (1 << IPCT_SEQADJ) |
1944 (1 << IPCT_MARK) | events,
1945 ct, NETLINK_CB(skb).portid,
1946 nlmsg_report(nlh));
1947 nf_ct_put(ct);
1948 }
1949
1950 return err;
1951 }
1952 /* implicit 'else' */
1953
1954 err = -EEXIST;
1955 ct = nf_ct_tuplehash_to_ctrack(h);
1956 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1957 spin_lock_bh(&nf_conntrack_expect_lock);
1958 err = ctnetlink_change_conntrack(ct, cda);
1959 spin_unlock_bh(&nf_conntrack_expect_lock);
1960 if (err == 0) {
1961 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1962 (1 << IPCT_ASSURED) |
1963 (1 << IPCT_HELPER) |
1964 (1 << IPCT_LABEL) |
1965 (1 << IPCT_PROTOINFO) |
1966 (1 << IPCT_SEQADJ) |
1967 (1 << IPCT_MARK),
1968 ct, NETLINK_CB(skb).portid,
1969 nlmsg_report(nlh));
1970 }
1971 }
1972
1973 nf_ct_put(ct);
1974 return err;
1975 }
1976
1977 static int
ctnetlink_ct_stat_cpu_fill_info(struct sk_buff * skb,u32 portid,u32 seq,__u16 cpu,const struct ip_conntrack_stat * st)1978 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1979 __u16 cpu, const struct ip_conntrack_stat *st)
1980 {
1981 struct nlmsghdr *nlh;
1982 struct nfgenmsg *nfmsg;
1983 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1984
1985 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1986 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1987 if (nlh == NULL)
1988 goto nlmsg_failure;
1989
1990 nfmsg = nlmsg_data(nlh);
1991 nfmsg->nfgen_family = AF_UNSPEC;
1992 nfmsg->version = NFNETLINK_V0;
1993 nfmsg->res_id = htons(cpu);
1994
1995 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1996 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1997 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1998 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1999 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2000 htonl(st->insert_failed)) ||
2001 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2002 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2003 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2004 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2005 htonl(st->search_restart)))
2006 goto nla_put_failure;
2007
2008 nlmsg_end(skb, nlh);
2009 return skb->len;
2010
2011 nla_put_failure:
2012 nlmsg_failure:
2013 nlmsg_cancel(skb, nlh);
2014 return -1;
2015 }
2016
2017 static int
ctnetlink_ct_stat_cpu_dump(struct sk_buff * skb,struct netlink_callback * cb)2018 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2019 {
2020 int cpu;
2021 struct net *net = sock_net(skb->sk);
2022
2023 if (cb->args[0] == nr_cpu_ids)
2024 return 0;
2025
2026 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2027 const struct ip_conntrack_stat *st;
2028
2029 if (!cpu_possible(cpu))
2030 continue;
2031
2032 st = per_cpu_ptr(net->ct.stat, cpu);
2033 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2034 NETLINK_CB(cb->skb).portid,
2035 cb->nlh->nlmsg_seq,
2036 cpu, st) < 0)
2037 break;
2038 }
2039 cb->args[0] = cpu;
2040
2041 return skb->len;
2042 }
2043
ctnetlink_stat_ct_cpu(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])2044 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2045 struct sk_buff *skb,
2046 const struct nlmsghdr *nlh,
2047 const struct nlattr * const cda[])
2048 {
2049 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2050 struct netlink_dump_control c = {
2051 .dump = ctnetlink_ct_stat_cpu_dump,
2052 };
2053 return netlink_dump_start(ctnl, skb, nlh, &c);
2054 }
2055
2056 return 0;
2057 }
2058
2059 static int
ctnetlink_stat_ct_fill_info(struct sk_buff * skb,u32 portid,u32 seq,u32 type,struct net * net)2060 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2061 struct net *net)
2062 {
2063 struct nlmsghdr *nlh;
2064 struct nfgenmsg *nfmsg;
2065 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2066 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2067
2068 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
2069 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2070 if (nlh == NULL)
2071 goto nlmsg_failure;
2072
2073 nfmsg = nlmsg_data(nlh);
2074 nfmsg->nfgen_family = AF_UNSPEC;
2075 nfmsg->version = NFNETLINK_V0;
2076 nfmsg->res_id = 0;
2077
2078 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2079 goto nla_put_failure;
2080
2081 nlmsg_end(skb, nlh);
2082 return skb->len;
2083
2084 nla_put_failure:
2085 nlmsg_failure:
2086 nlmsg_cancel(skb, nlh);
2087 return -1;
2088 }
2089
ctnetlink_stat_ct(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])2090 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2091 struct sk_buff *skb, const struct nlmsghdr *nlh,
2092 const struct nlattr * const cda[])
2093 {
2094 struct sk_buff *skb2;
2095 int err;
2096
2097 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2098 if (skb2 == NULL)
2099 return -ENOMEM;
2100
2101 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2102 nlh->nlmsg_seq,
2103 NFNL_MSG_TYPE(nlh->nlmsg_type),
2104 sock_net(skb->sk));
2105 if (err <= 0)
2106 goto free;
2107
2108 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2109 if (err < 0)
2110 goto out;
2111
2112 return 0;
2113
2114 free:
2115 kfree_skb(skb2);
2116 out:
2117 /* this avoids a loop in nfnetlink. */
2118 return err == -EAGAIN ? -ENOBUFS : err;
2119 }
2120
2121 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2122 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2123 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2124 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2125 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2126 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2127 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2128 .len = NF_CT_HELPER_NAME_LEN - 1 },
2129 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2130 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2131 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2132 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2133 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2134 };
2135
2136 static struct nf_conntrack_expect *
2137 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2138 struct nf_conntrack_helper *helper,
2139 struct nf_conntrack_tuple *tuple,
2140 struct nf_conntrack_tuple *mask);
2141
2142 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2143 static size_t
ctnetlink_glue_build_size(const struct nf_conn * ct)2144 ctnetlink_glue_build_size(const struct nf_conn *ct)
2145 {
2146 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2147 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2148 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2149 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2150 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2151 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2152 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2153 + nla_total_size(0) /* CTA_PROTOINFO */
2154 + nla_total_size(0) /* CTA_HELP */
2155 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2156 + ctnetlink_secctx_size(ct)
2157 #ifdef CONFIG_NF_NAT_NEEDED
2158 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2159 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2160 #endif
2161 #ifdef CONFIG_NF_CONNTRACK_MARK
2162 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2163 #endif
2164 #ifdef CONFIG_NF_CONNTRACK_ZONES
2165 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2166 #endif
2167 + ctnetlink_proto_size(ct)
2168 ;
2169 }
2170
ctnetlink_glue_get_ct(const struct sk_buff * skb,enum ip_conntrack_info * ctinfo)2171 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2172 enum ip_conntrack_info *ctinfo)
2173 {
2174 struct nf_conn *ct;
2175
2176 ct = nf_ct_get(skb, ctinfo);
2177 if (ct && nf_ct_is_untracked(ct))
2178 ct = NULL;
2179
2180 return ct;
2181 }
2182
__ctnetlink_glue_build(struct sk_buff * skb,struct nf_conn * ct)2183 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2184 {
2185 const struct nf_conntrack_zone *zone;
2186 struct nlattr *nest_parms;
2187
2188 rcu_read_lock();
2189 zone = nf_ct_zone(ct);
2190
2191 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2192 if (!nest_parms)
2193 goto nla_put_failure;
2194 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2195 goto nla_put_failure;
2196 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2197 NF_CT_ZONE_DIR_ORIG) < 0)
2198 goto nla_put_failure;
2199 nla_nest_end(skb, nest_parms);
2200
2201 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2202 if (!nest_parms)
2203 goto nla_put_failure;
2204 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2205 goto nla_put_failure;
2206 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2207 NF_CT_ZONE_DIR_REPL) < 0)
2208 goto nla_put_failure;
2209 nla_nest_end(skb, nest_parms);
2210
2211 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2212 NF_CT_DEFAULT_ZONE_DIR) < 0)
2213 goto nla_put_failure;
2214
2215 if (ctnetlink_dump_id(skb, ct) < 0)
2216 goto nla_put_failure;
2217
2218 if (ctnetlink_dump_status(skb, ct) < 0)
2219 goto nla_put_failure;
2220
2221 if (ctnetlink_dump_timeout(skb, ct) < 0)
2222 goto nla_put_failure;
2223
2224 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2225 goto nla_put_failure;
2226
2227 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2228 goto nla_put_failure;
2229
2230 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2231 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2232 goto nla_put_failure;
2233 #endif
2234 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2235 goto nla_put_failure;
2236
2237 if ((ct->status & IPS_SEQ_ADJUST) &&
2238 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2239 goto nla_put_failure;
2240
2241 #ifdef CONFIG_NF_CONNTRACK_MARK
2242 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2243 goto nla_put_failure;
2244 #endif
2245 if (ctnetlink_dump_labels(skb, ct) < 0)
2246 goto nla_put_failure;
2247 rcu_read_unlock();
2248 return 0;
2249
2250 nla_put_failure:
2251 rcu_read_unlock();
2252 return -ENOSPC;
2253 }
2254
2255 static int
ctnetlink_glue_build(struct sk_buff * skb,struct nf_conn * ct,enum ip_conntrack_info ctinfo,u_int16_t ct_attr,u_int16_t ct_info_attr)2256 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2257 enum ip_conntrack_info ctinfo,
2258 u_int16_t ct_attr, u_int16_t ct_info_attr)
2259 {
2260 struct nlattr *nest_parms;
2261
2262 nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
2263 if (!nest_parms)
2264 goto nla_put_failure;
2265
2266 if (__ctnetlink_glue_build(skb, ct) < 0)
2267 goto nla_put_failure;
2268
2269 nla_nest_end(skb, nest_parms);
2270
2271 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2272 goto nla_put_failure;
2273
2274 return 0;
2275
2276 nla_put_failure:
2277 return -ENOSPC;
2278 }
2279
2280 static int
ctnetlink_glue_parse_ct(const struct nlattr * cda[],struct nf_conn * ct)2281 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2282 {
2283 int err;
2284
2285 if (cda[CTA_TIMEOUT]) {
2286 err = ctnetlink_change_timeout(ct, cda);
2287 if (err < 0)
2288 return err;
2289 }
2290 if (cda[CTA_STATUS]) {
2291 err = ctnetlink_change_status(ct, cda);
2292 if (err < 0)
2293 return err;
2294 }
2295 if (cda[CTA_HELP]) {
2296 err = ctnetlink_change_helper(ct, cda);
2297 if (err < 0)
2298 return err;
2299 }
2300 if (cda[CTA_LABELS]) {
2301 err = ctnetlink_attach_labels(ct, cda);
2302 if (err < 0)
2303 return err;
2304 }
2305 #if defined(CONFIG_NF_CONNTRACK_MARK)
2306 if (cda[CTA_MARK]) {
2307 u32 mask = 0, mark, newmark;
2308 if (cda[CTA_MARK_MASK])
2309 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2310
2311 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2312 newmark = (ct->mark & mask) ^ mark;
2313 if (newmark != ct->mark)
2314 ct->mark = newmark;
2315 }
2316 #endif
2317 return 0;
2318 }
2319
2320 static int
ctnetlink_glue_parse(const struct nlattr * attr,struct nf_conn * ct)2321 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2322 {
2323 struct nlattr *cda[CTA_MAX+1];
2324 int ret;
2325
2326 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2327 if (ret < 0)
2328 return ret;
2329
2330 spin_lock_bh(&nf_conntrack_expect_lock);
2331 ret = ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2332 spin_unlock_bh(&nf_conntrack_expect_lock);
2333
2334 return ret;
2335 }
2336
ctnetlink_glue_exp_parse(const struct nlattr * const * cda,const struct nf_conn * ct,struct nf_conntrack_tuple * tuple,struct nf_conntrack_tuple * mask)2337 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2338 const struct nf_conn *ct,
2339 struct nf_conntrack_tuple *tuple,
2340 struct nf_conntrack_tuple *mask)
2341 {
2342 int err;
2343
2344 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2345 nf_ct_l3num(ct), NULL);
2346 if (err < 0)
2347 return err;
2348
2349 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2350 nf_ct_l3num(ct), NULL);
2351 }
2352
2353 static int
ctnetlink_glue_attach_expect(const struct nlattr * attr,struct nf_conn * ct,u32 portid,u32 report)2354 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2355 u32 portid, u32 report)
2356 {
2357 struct nlattr *cda[CTA_EXPECT_MAX+1];
2358 struct nf_conntrack_tuple tuple, mask;
2359 struct nf_conntrack_helper *helper = NULL;
2360 struct nf_conntrack_expect *exp;
2361 int err;
2362
2363 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2364 if (err < 0)
2365 return err;
2366
2367 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2368 ct, &tuple, &mask);
2369 if (err < 0)
2370 return err;
2371
2372 if (cda[CTA_EXPECT_HELP_NAME]) {
2373 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2374
2375 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2376 nf_ct_protonum(ct));
2377 if (helper == NULL)
2378 return -EOPNOTSUPP;
2379 }
2380
2381 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2382 helper, &tuple, &mask);
2383 if (IS_ERR(exp))
2384 return PTR_ERR(exp);
2385
2386 err = nf_ct_expect_related_report(exp, portid, report);
2387 nf_ct_expect_put(exp);
2388 return err;
2389 }
2390
ctnetlink_glue_seqadj(struct sk_buff * skb,struct nf_conn * ct,enum ip_conntrack_info ctinfo,int diff)2391 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2392 enum ip_conntrack_info ctinfo, int diff)
2393 {
2394 if (!(ct->status & IPS_NAT_MASK))
2395 return;
2396
2397 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2398 }
2399
2400 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2401 .get_ct = ctnetlink_glue_get_ct,
2402 .build_size = ctnetlink_glue_build_size,
2403 .build = ctnetlink_glue_build,
2404 .parse = ctnetlink_glue_parse,
2405 .attach_expect = ctnetlink_glue_attach_expect,
2406 .seq_adjust = ctnetlink_glue_seqadj,
2407 };
2408 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2409
2410 /***********************************************************************
2411 * EXPECT
2412 ***********************************************************************/
2413
ctnetlink_exp_dump_tuple(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,u32 type)2414 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2415 const struct nf_conntrack_tuple *tuple,
2416 u32 type)
2417 {
2418 struct nlattr *nest_parms;
2419
2420 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2421 if (!nest_parms)
2422 goto nla_put_failure;
2423 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2424 goto nla_put_failure;
2425 nla_nest_end(skb, nest_parms);
2426
2427 return 0;
2428
2429 nla_put_failure:
2430 return -1;
2431 }
2432
ctnetlink_exp_dump_mask(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,const struct nf_conntrack_tuple_mask * mask)2433 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2434 const struct nf_conntrack_tuple *tuple,
2435 const struct nf_conntrack_tuple_mask *mask)
2436 {
2437 int ret;
2438 struct nf_conntrack_l3proto *l3proto;
2439 struct nf_conntrack_l4proto *l4proto;
2440 struct nf_conntrack_tuple m;
2441 struct nlattr *nest_parms;
2442
2443 memset(&m, 0xFF, sizeof(m));
2444 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2445 m.src.u.all = mask->src.u.all;
2446 m.dst.protonum = tuple->dst.protonum;
2447
2448 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2449 if (!nest_parms)
2450 goto nla_put_failure;
2451
2452 rcu_read_lock();
2453 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2454 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2455 if (ret >= 0) {
2456 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2457 tuple->dst.protonum);
2458 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2459 }
2460 rcu_read_unlock();
2461
2462 if (unlikely(ret < 0))
2463 goto nla_put_failure;
2464
2465 nla_nest_end(skb, nest_parms);
2466
2467 return 0;
2468
2469 nla_put_failure:
2470 return -1;
2471 }
2472
2473 static const union nf_inet_addr any_addr;
2474
2475 static int
ctnetlink_exp_dump_expect(struct sk_buff * skb,const struct nf_conntrack_expect * exp)2476 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2477 const struct nf_conntrack_expect *exp)
2478 {
2479 struct nf_conn *master = exp->master;
2480 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2481 struct nf_conn_help *help;
2482 #ifdef CONFIG_NF_NAT_NEEDED
2483 struct nlattr *nest_parms;
2484 struct nf_conntrack_tuple nat_tuple = {};
2485 #endif
2486 struct nf_ct_helper_expectfn *expfn;
2487
2488 if (timeout < 0)
2489 timeout = 0;
2490
2491 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2492 goto nla_put_failure;
2493 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2494 goto nla_put_failure;
2495 if (ctnetlink_exp_dump_tuple(skb,
2496 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2497 CTA_EXPECT_MASTER) < 0)
2498 goto nla_put_failure;
2499
2500 #ifdef CONFIG_NF_NAT_NEEDED
2501 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2502 exp->saved_proto.all) {
2503 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2504 if (!nest_parms)
2505 goto nla_put_failure;
2506
2507 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2508 goto nla_put_failure;
2509
2510 nat_tuple.src.l3num = nf_ct_l3num(master);
2511 nat_tuple.src.u3 = exp->saved_addr;
2512 nat_tuple.dst.protonum = nf_ct_protonum(master);
2513 nat_tuple.src.u = exp->saved_proto;
2514
2515 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2516 CTA_EXPECT_NAT_TUPLE) < 0)
2517 goto nla_put_failure;
2518 nla_nest_end(skb, nest_parms);
2519 }
2520 #endif
2521 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2522 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2523 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2524 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2525 goto nla_put_failure;
2526 help = nfct_help(master);
2527 if (help) {
2528 struct nf_conntrack_helper *helper;
2529
2530 helper = rcu_dereference(help->helper);
2531 if (helper &&
2532 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2533 goto nla_put_failure;
2534 }
2535 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2536 if (expfn != NULL &&
2537 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2538 goto nla_put_failure;
2539
2540 return 0;
2541
2542 nla_put_failure:
2543 return -1;
2544 }
2545
2546 static int
ctnetlink_exp_fill_info(struct sk_buff * skb,u32 portid,u32 seq,int event,const struct nf_conntrack_expect * exp)2547 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2548 int event, const struct nf_conntrack_expect *exp)
2549 {
2550 struct nlmsghdr *nlh;
2551 struct nfgenmsg *nfmsg;
2552 unsigned int flags = portid ? NLM_F_MULTI : 0;
2553
2554 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2555 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2556 if (nlh == NULL)
2557 goto nlmsg_failure;
2558
2559 nfmsg = nlmsg_data(nlh);
2560 nfmsg->nfgen_family = exp->tuple.src.l3num;
2561 nfmsg->version = NFNETLINK_V0;
2562 nfmsg->res_id = 0;
2563
2564 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2565 goto nla_put_failure;
2566
2567 nlmsg_end(skb, nlh);
2568 return skb->len;
2569
2570 nlmsg_failure:
2571 nla_put_failure:
2572 nlmsg_cancel(skb, nlh);
2573 return -1;
2574 }
2575
2576 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2577 static int
ctnetlink_expect_event(unsigned int events,struct nf_exp_event * item)2578 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2579 {
2580 struct nf_conntrack_expect *exp = item->exp;
2581 struct net *net = nf_ct_exp_net(exp);
2582 struct nlmsghdr *nlh;
2583 struct nfgenmsg *nfmsg;
2584 struct sk_buff *skb;
2585 unsigned int type, group;
2586 int flags = 0;
2587
2588 if (events & (1 << IPEXP_DESTROY)) {
2589 type = IPCTNL_MSG_EXP_DELETE;
2590 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2591 } else if (events & (1 << IPEXP_NEW)) {
2592 type = IPCTNL_MSG_EXP_NEW;
2593 flags = NLM_F_CREATE|NLM_F_EXCL;
2594 group = NFNLGRP_CONNTRACK_EXP_NEW;
2595 } else
2596 return 0;
2597
2598 if (!item->report && !nfnetlink_has_listeners(net, group))
2599 return 0;
2600
2601 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2602 if (skb == NULL)
2603 goto errout;
2604
2605 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2606 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2607 if (nlh == NULL)
2608 goto nlmsg_failure;
2609
2610 nfmsg = nlmsg_data(nlh);
2611 nfmsg->nfgen_family = exp->tuple.src.l3num;
2612 nfmsg->version = NFNETLINK_V0;
2613 nfmsg->res_id = 0;
2614
2615 rcu_read_lock();
2616 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2617 goto nla_put_failure;
2618 rcu_read_unlock();
2619
2620 nlmsg_end(skb, nlh);
2621 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2622 return 0;
2623
2624 nla_put_failure:
2625 rcu_read_unlock();
2626 nlmsg_cancel(skb, nlh);
2627 nlmsg_failure:
2628 kfree_skb(skb);
2629 errout:
2630 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2631 return 0;
2632 }
2633 #endif
ctnetlink_exp_done(struct netlink_callback * cb)2634 static int ctnetlink_exp_done(struct netlink_callback *cb)
2635 {
2636 if (cb->args[1])
2637 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2638 return 0;
2639 }
2640
2641 static int
ctnetlink_exp_dump_table(struct sk_buff * skb,struct netlink_callback * cb)2642 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2643 {
2644 struct net *net = sock_net(skb->sk);
2645 struct nf_conntrack_expect *exp, *last;
2646 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2647 u_int8_t l3proto = nfmsg->nfgen_family;
2648
2649 rcu_read_lock();
2650 last = (struct nf_conntrack_expect *)cb->args[1];
2651 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2652 restart:
2653 hlist_for_each_entry(exp, &nf_ct_expect_hash[cb->args[0]],
2654 hnode) {
2655 if (l3proto && exp->tuple.src.l3num != l3proto)
2656 continue;
2657
2658 if (!net_eq(nf_ct_net(exp->master), net))
2659 continue;
2660
2661 if (cb->args[1]) {
2662 if (exp != last)
2663 continue;
2664 cb->args[1] = 0;
2665 }
2666 if (ctnetlink_exp_fill_info(skb,
2667 NETLINK_CB(cb->skb).portid,
2668 cb->nlh->nlmsg_seq,
2669 IPCTNL_MSG_EXP_NEW,
2670 exp) < 0) {
2671 if (!atomic_inc_not_zero(&exp->use))
2672 continue;
2673 cb->args[1] = (unsigned long)exp;
2674 goto out;
2675 }
2676 }
2677 if (cb->args[1]) {
2678 cb->args[1] = 0;
2679 goto restart;
2680 }
2681 }
2682 out:
2683 rcu_read_unlock();
2684 if (last)
2685 nf_ct_expect_put(last);
2686
2687 return skb->len;
2688 }
2689
2690 static int
ctnetlink_exp_ct_dump_table(struct sk_buff * skb,struct netlink_callback * cb)2691 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2692 {
2693 struct nf_conntrack_expect *exp, *last;
2694 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2695 struct nf_conn *ct = cb->data;
2696 struct nf_conn_help *help = nfct_help(ct);
2697 u_int8_t l3proto = nfmsg->nfgen_family;
2698
2699 if (cb->args[0])
2700 return 0;
2701
2702 rcu_read_lock();
2703 last = (struct nf_conntrack_expect *)cb->args[1];
2704 restart:
2705 hlist_for_each_entry(exp, &help->expectations, lnode) {
2706 if (l3proto && exp->tuple.src.l3num != l3proto)
2707 continue;
2708 if (cb->args[1]) {
2709 if (exp != last)
2710 continue;
2711 cb->args[1] = 0;
2712 }
2713 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2714 cb->nlh->nlmsg_seq,
2715 IPCTNL_MSG_EXP_NEW,
2716 exp) < 0) {
2717 if (!atomic_inc_not_zero(&exp->use))
2718 continue;
2719 cb->args[1] = (unsigned long)exp;
2720 goto out;
2721 }
2722 }
2723 if (cb->args[1]) {
2724 cb->args[1] = 0;
2725 goto restart;
2726 }
2727 cb->args[0] = 1;
2728 out:
2729 rcu_read_unlock();
2730 if (last)
2731 nf_ct_expect_put(last);
2732
2733 return skb->len;
2734 }
2735
ctnetlink_dump_exp_ct(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])2736 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2737 struct sk_buff *skb,
2738 const struct nlmsghdr *nlh,
2739 const struct nlattr * const cda[])
2740 {
2741 int err;
2742 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2743 u_int8_t u3 = nfmsg->nfgen_family;
2744 struct nf_conntrack_tuple tuple;
2745 struct nf_conntrack_tuple_hash *h;
2746 struct nf_conn *ct;
2747 struct nf_conntrack_zone zone;
2748 struct netlink_dump_control c = {
2749 .dump = ctnetlink_exp_ct_dump_table,
2750 .done = ctnetlink_exp_done,
2751 };
2752
2753 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2754 u3, NULL);
2755 if (err < 0)
2756 return err;
2757
2758 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2759 if (err < 0)
2760 return err;
2761
2762 h = nf_conntrack_find_get(net, &zone, &tuple);
2763 if (!h)
2764 return -ENOENT;
2765
2766 ct = nf_ct_tuplehash_to_ctrack(h);
2767 c.data = ct;
2768
2769 err = netlink_dump_start(ctnl, skb, nlh, &c);
2770 nf_ct_put(ct);
2771
2772 return err;
2773 }
2774
ctnetlink_get_expect(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])2775 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
2776 struct sk_buff *skb, const struct nlmsghdr *nlh,
2777 const struct nlattr * const cda[])
2778 {
2779 struct nf_conntrack_tuple tuple;
2780 struct nf_conntrack_expect *exp;
2781 struct sk_buff *skb2;
2782 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2783 u_int8_t u3 = nfmsg->nfgen_family;
2784 struct nf_conntrack_zone zone;
2785 int err;
2786
2787 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2788 if (cda[CTA_EXPECT_MASTER])
2789 return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda);
2790 else {
2791 struct netlink_dump_control c = {
2792 .dump = ctnetlink_exp_dump_table,
2793 .done = ctnetlink_exp_done,
2794 };
2795 return netlink_dump_start(ctnl, skb, nlh, &c);
2796 }
2797 }
2798
2799 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2800 if (err < 0)
2801 return err;
2802
2803 if (cda[CTA_EXPECT_TUPLE])
2804 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2805 u3, NULL);
2806 else if (cda[CTA_EXPECT_MASTER])
2807 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2808 u3, NULL);
2809 else
2810 return -EINVAL;
2811
2812 if (err < 0)
2813 return err;
2814
2815 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2816 if (!exp)
2817 return -ENOENT;
2818
2819 if (cda[CTA_EXPECT_ID]) {
2820 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2821 if (ntohl(id) != (u32)(unsigned long)exp) {
2822 nf_ct_expect_put(exp);
2823 return -ENOENT;
2824 }
2825 }
2826
2827 err = -ENOMEM;
2828 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2829 if (skb2 == NULL) {
2830 nf_ct_expect_put(exp);
2831 goto out;
2832 }
2833
2834 rcu_read_lock();
2835 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2836 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2837 rcu_read_unlock();
2838 nf_ct_expect_put(exp);
2839 if (err <= 0)
2840 goto free;
2841
2842 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2843 if (err < 0)
2844 goto out;
2845
2846 return 0;
2847
2848 free:
2849 kfree_skb(skb2);
2850 out:
2851 /* this avoids a loop in nfnetlink. */
2852 return err == -EAGAIN ? -ENOBUFS : err;
2853 }
2854
ctnetlink_del_expect(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])2855 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
2856 struct sk_buff *skb, const struct nlmsghdr *nlh,
2857 const struct nlattr * const cda[])
2858 {
2859 struct nf_conntrack_expect *exp;
2860 struct nf_conntrack_tuple tuple;
2861 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2862 struct hlist_node *next;
2863 u_int8_t u3 = nfmsg->nfgen_family;
2864 struct nf_conntrack_zone zone;
2865 unsigned int i;
2866 int err;
2867
2868 if (cda[CTA_EXPECT_TUPLE]) {
2869 /* delete a single expect by tuple */
2870 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2871 if (err < 0)
2872 return err;
2873
2874 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2875 u3, NULL);
2876 if (err < 0)
2877 return err;
2878
2879 /* bump usage count to 2 */
2880 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2881 if (!exp)
2882 return -ENOENT;
2883
2884 if (cda[CTA_EXPECT_ID]) {
2885 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2886 if (ntohl(id) != (u32)(unsigned long)exp) {
2887 nf_ct_expect_put(exp);
2888 return -ENOENT;
2889 }
2890 }
2891
2892 /* after list removal, usage count == 1 */
2893 spin_lock_bh(&nf_conntrack_expect_lock);
2894 if (del_timer(&exp->timeout)) {
2895 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2896 nlmsg_report(nlh));
2897 nf_ct_expect_put(exp);
2898 }
2899 spin_unlock_bh(&nf_conntrack_expect_lock);
2900 /* have to put what we 'get' above.
2901 * after this line usage count == 0 */
2902 nf_ct_expect_put(exp);
2903 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2904 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2905 struct nf_conn_help *m_help;
2906
2907 /* delete all expectations for this helper */
2908 spin_lock_bh(&nf_conntrack_expect_lock);
2909 for (i = 0; i < nf_ct_expect_hsize; i++) {
2910 hlist_for_each_entry_safe(exp, next,
2911 &nf_ct_expect_hash[i],
2912 hnode) {
2913
2914 if (!net_eq(nf_ct_exp_net(exp), net))
2915 continue;
2916
2917 m_help = nfct_help(exp->master);
2918 if (!strcmp(m_help->helper->name, name) &&
2919 del_timer(&exp->timeout)) {
2920 nf_ct_unlink_expect_report(exp,
2921 NETLINK_CB(skb).portid,
2922 nlmsg_report(nlh));
2923 nf_ct_expect_put(exp);
2924 }
2925 }
2926 }
2927 spin_unlock_bh(&nf_conntrack_expect_lock);
2928 } else {
2929 /* This basically means we have to flush everything*/
2930 spin_lock_bh(&nf_conntrack_expect_lock);
2931 for (i = 0; i < nf_ct_expect_hsize; i++) {
2932 hlist_for_each_entry_safe(exp, next,
2933 &nf_ct_expect_hash[i],
2934 hnode) {
2935
2936 if (!net_eq(nf_ct_exp_net(exp), net))
2937 continue;
2938
2939 if (del_timer(&exp->timeout)) {
2940 nf_ct_unlink_expect_report(exp,
2941 NETLINK_CB(skb).portid,
2942 nlmsg_report(nlh));
2943 nf_ct_expect_put(exp);
2944 }
2945 }
2946 }
2947 spin_unlock_bh(&nf_conntrack_expect_lock);
2948 }
2949
2950 return 0;
2951 }
2952 static int
ctnetlink_change_expect(struct nf_conntrack_expect * x,const struct nlattr * const cda[])2953 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2954 const struct nlattr * const cda[])
2955 {
2956 if (cda[CTA_EXPECT_TIMEOUT]) {
2957 if (!del_timer(&x->timeout))
2958 return -ETIME;
2959
2960 x->timeout.expires = jiffies +
2961 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2962 add_timer(&x->timeout);
2963 }
2964 return 0;
2965 }
2966
2967 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2968 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2969 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2970 };
2971
2972 static int
ctnetlink_parse_expect_nat(const struct nlattr * attr,struct nf_conntrack_expect * exp,u_int8_t u3)2973 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2974 struct nf_conntrack_expect *exp,
2975 u_int8_t u3)
2976 {
2977 #ifdef CONFIG_NF_NAT_NEEDED
2978 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2979 struct nf_conntrack_tuple nat_tuple = {};
2980 int err;
2981
2982 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2983 if (err < 0)
2984 return err;
2985
2986 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2987 return -EINVAL;
2988
2989 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2990 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
2991 u3, NULL);
2992 if (err < 0)
2993 return err;
2994
2995 exp->saved_addr = nat_tuple.src.u3;
2996 exp->saved_proto = nat_tuple.src.u;
2997 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2998
2999 return 0;
3000 #else
3001 return -EOPNOTSUPP;
3002 #endif
3003 }
3004
3005 static struct nf_conntrack_expect *
ctnetlink_alloc_expect(const struct nlattr * const cda[],struct nf_conn * ct,struct nf_conntrack_helper * helper,struct nf_conntrack_tuple * tuple,struct nf_conntrack_tuple * mask)3006 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3007 struct nf_conntrack_helper *helper,
3008 struct nf_conntrack_tuple *tuple,
3009 struct nf_conntrack_tuple *mask)
3010 {
3011 u_int32_t class = 0;
3012 struct nf_conntrack_expect *exp;
3013 struct nf_conn_help *help;
3014 int err;
3015
3016 if (cda[CTA_EXPECT_CLASS] && helper) {
3017 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3018 if (class > helper->expect_class_max)
3019 return ERR_PTR(-EINVAL);
3020 }
3021 exp = nf_ct_expect_alloc(ct);
3022 if (!exp)
3023 return ERR_PTR(-ENOMEM);
3024
3025 help = nfct_help(ct);
3026 if (!help) {
3027 if (!cda[CTA_EXPECT_TIMEOUT]) {
3028 err = -EINVAL;
3029 goto err_out;
3030 }
3031 exp->timeout.expires =
3032 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3033
3034 exp->flags = NF_CT_EXPECT_USERSPACE;
3035 if (cda[CTA_EXPECT_FLAGS]) {
3036 exp->flags |=
3037 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3038 }
3039 } else {
3040 if (cda[CTA_EXPECT_FLAGS]) {
3041 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3042 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3043 } else
3044 exp->flags = 0;
3045 }
3046 if (cda[CTA_EXPECT_FN]) {
3047 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3048 struct nf_ct_helper_expectfn *expfn;
3049
3050 expfn = nf_ct_helper_expectfn_find_by_name(name);
3051 if (expfn == NULL) {
3052 err = -EINVAL;
3053 goto err_out;
3054 }
3055 exp->expectfn = expfn->expectfn;
3056 } else
3057 exp->expectfn = NULL;
3058
3059 exp->class = class;
3060 exp->master = ct;
3061 exp->helper = helper;
3062 exp->tuple = *tuple;
3063 exp->mask.src.u3 = mask->src.u3;
3064 exp->mask.src.u.all = mask->src.u.all;
3065
3066 if (cda[CTA_EXPECT_NAT]) {
3067 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3068 exp, nf_ct_l3num(ct));
3069 if (err < 0)
3070 goto err_out;
3071 }
3072 return exp;
3073 err_out:
3074 nf_ct_expect_put(exp);
3075 return ERR_PTR(err);
3076 }
3077
3078 static int
ctnetlink_create_expect(struct net * net,const struct nf_conntrack_zone * zone,const struct nlattr * const cda[],u_int8_t u3,u32 portid,int report)3079 ctnetlink_create_expect(struct net *net,
3080 const struct nf_conntrack_zone *zone,
3081 const struct nlattr * const cda[],
3082 u_int8_t u3, u32 portid, int report)
3083 {
3084 struct nf_conntrack_tuple tuple, mask, master_tuple;
3085 struct nf_conntrack_tuple_hash *h = NULL;
3086 struct nf_conntrack_helper *helper = NULL;
3087 struct nf_conntrack_expect *exp;
3088 struct nf_conn *ct;
3089 int err;
3090
3091 /* caller guarantees that those three CTA_EXPECT_* exist */
3092 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3093 u3, NULL);
3094 if (err < 0)
3095 return err;
3096 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3097 u3, NULL);
3098 if (err < 0)
3099 return err;
3100 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3101 u3, NULL);
3102 if (err < 0)
3103 return err;
3104
3105 /* Look for master conntrack of this expectation */
3106 h = nf_conntrack_find_get(net, zone, &master_tuple);
3107 if (!h)
3108 return -ENOENT;
3109 ct = nf_ct_tuplehash_to_ctrack(h);
3110
3111 if (cda[CTA_EXPECT_HELP_NAME]) {
3112 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3113
3114 helper = __nf_conntrack_helper_find(helpname, u3,
3115 nf_ct_protonum(ct));
3116 if (helper == NULL) {
3117 #ifdef CONFIG_MODULES
3118 if (request_module("nfct-helper-%s", helpname) < 0) {
3119 err = -EOPNOTSUPP;
3120 goto err_ct;
3121 }
3122 helper = __nf_conntrack_helper_find(helpname, u3,
3123 nf_ct_protonum(ct));
3124 if (helper) {
3125 err = -EAGAIN;
3126 goto err_ct;
3127 }
3128 #endif
3129 err = -EOPNOTSUPP;
3130 goto err_ct;
3131 }
3132 }
3133
3134 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3135 if (IS_ERR(exp)) {
3136 err = PTR_ERR(exp);
3137 goto err_ct;
3138 }
3139
3140 err = nf_ct_expect_related_report(exp, portid, report);
3141 nf_ct_expect_put(exp);
3142 err_ct:
3143 nf_ct_put(ct);
3144 return err;
3145 }
3146
ctnetlink_new_expect(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])3147 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3148 struct sk_buff *skb, const struct nlmsghdr *nlh,
3149 const struct nlattr * const cda[])
3150 {
3151 struct nf_conntrack_tuple tuple;
3152 struct nf_conntrack_expect *exp;
3153 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3154 u_int8_t u3 = nfmsg->nfgen_family;
3155 struct nf_conntrack_zone zone;
3156 int err;
3157
3158 if (!cda[CTA_EXPECT_TUPLE]
3159 || !cda[CTA_EXPECT_MASK]
3160 || !cda[CTA_EXPECT_MASTER])
3161 return -EINVAL;
3162
3163 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3164 if (err < 0)
3165 return err;
3166
3167 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3168 u3, NULL);
3169 if (err < 0)
3170 return err;
3171
3172 spin_lock_bh(&nf_conntrack_expect_lock);
3173 exp = __nf_ct_expect_find(net, &zone, &tuple);
3174 if (!exp) {
3175 spin_unlock_bh(&nf_conntrack_expect_lock);
3176 err = -ENOENT;
3177 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3178 err = ctnetlink_create_expect(net, &zone, cda, u3,
3179 NETLINK_CB(skb).portid,
3180 nlmsg_report(nlh));
3181 }
3182 return err;
3183 }
3184
3185 err = -EEXIST;
3186 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3187 err = ctnetlink_change_expect(exp, cda);
3188 spin_unlock_bh(&nf_conntrack_expect_lock);
3189
3190 return err;
3191 }
3192
3193 static int
ctnetlink_exp_stat_fill_info(struct sk_buff * skb,u32 portid,u32 seq,int cpu,const struct ip_conntrack_stat * st)3194 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3195 const struct ip_conntrack_stat *st)
3196 {
3197 struct nlmsghdr *nlh;
3198 struct nfgenmsg *nfmsg;
3199 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3200
3201 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3202 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3203 if (nlh == NULL)
3204 goto nlmsg_failure;
3205
3206 nfmsg = nlmsg_data(nlh);
3207 nfmsg->nfgen_family = AF_UNSPEC;
3208 nfmsg->version = NFNETLINK_V0;
3209 nfmsg->res_id = htons(cpu);
3210
3211 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3212 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3213 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3214 goto nla_put_failure;
3215
3216 nlmsg_end(skb, nlh);
3217 return skb->len;
3218
3219 nla_put_failure:
3220 nlmsg_failure:
3221 nlmsg_cancel(skb, nlh);
3222 return -1;
3223 }
3224
3225 static int
ctnetlink_exp_stat_cpu_dump(struct sk_buff * skb,struct netlink_callback * cb)3226 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3227 {
3228 int cpu;
3229 struct net *net = sock_net(skb->sk);
3230
3231 if (cb->args[0] == nr_cpu_ids)
3232 return 0;
3233
3234 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3235 const struct ip_conntrack_stat *st;
3236
3237 if (!cpu_possible(cpu))
3238 continue;
3239
3240 st = per_cpu_ptr(net->ct.stat, cpu);
3241 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3242 cb->nlh->nlmsg_seq,
3243 cpu, st) < 0)
3244 break;
3245 }
3246 cb->args[0] = cpu;
3247
3248 return skb->len;
3249 }
3250
ctnetlink_stat_exp_cpu(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[])3251 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3252 struct sk_buff *skb,
3253 const struct nlmsghdr *nlh,
3254 const struct nlattr * const cda[])
3255 {
3256 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3257 struct netlink_dump_control c = {
3258 .dump = ctnetlink_exp_stat_cpu_dump,
3259 };
3260 return netlink_dump_start(ctnl, skb, nlh, &c);
3261 }
3262
3263 return 0;
3264 }
3265
3266 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3267 static struct nf_ct_event_notifier ctnl_notifier = {
3268 .fcn = ctnetlink_conntrack_event,
3269 };
3270
3271 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3272 .fcn = ctnetlink_expect_event,
3273 };
3274 #endif
3275
3276 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3277 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3278 .attr_count = CTA_MAX,
3279 .policy = ct_nla_policy },
3280 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3281 .attr_count = CTA_MAX,
3282 .policy = ct_nla_policy },
3283 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3284 .attr_count = CTA_MAX,
3285 .policy = ct_nla_policy },
3286 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3287 .attr_count = CTA_MAX,
3288 .policy = ct_nla_policy },
3289 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3290 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3291 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3292 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3293 };
3294
3295 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3296 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3297 .attr_count = CTA_EXPECT_MAX,
3298 .policy = exp_nla_policy },
3299 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3300 .attr_count = CTA_EXPECT_MAX,
3301 .policy = exp_nla_policy },
3302 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3303 .attr_count = CTA_EXPECT_MAX,
3304 .policy = exp_nla_policy },
3305 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3306 };
3307
3308 static const struct nfnetlink_subsystem ctnl_subsys = {
3309 .name = "conntrack",
3310 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3311 .cb_count = IPCTNL_MSG_MAX,
3312 .cb = ctnl_cb,
3313 };
3314
3315 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3316 .name = "conntrack_expect",
3317 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3318 .cb_count = IPCTNL_MSG_EXP_MAX,
3319 .cb = ctnl_exp_cb,
3320 };
3321
3322 MODULE_ALIAS("ip_conntrack_netlink");
3323 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3324 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3325
ctnetlink_net_init(struct net * net)3326 static int __net_init ctnetlink_net_init(struct net *net)
3327 {
3328 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3329 int ret;
3330
3331 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3332 if (ret < 0) {
3333 pr_err("ctnetlink_init: cannot register notifier.\n");
3334 goto err_out;
3335 }
3336
3337 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3338 if (ret < 0) {
3339 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3340 goto err_unreg_notifier;
3341 }
3342 #endif
3343 return 0;
3344
3345 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3346 err_unreg_notifier:
3347 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3348 err_out:
3349 return ret;
3350 #endif
3351 }
3352
ctnetlink_net_exit(struct net * net)3353 static void ctnetlink_net_exit(struct net *net)
3354 {
3355 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3356 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3357 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3358 #endif
3359 }
3360
ctnetlink_net_exit_batch(struct list_head * net_exit_list)3361 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3362 {
3363 struct net *net;
3364
3365 list_for_each_entry(net, net_exit_list, exit_list)
3366 ctnetlink_net_exit(net);
3367 }
3368
3369 static struct pernet_operations ctnetlink_net_ops = {
3370 .init = ctnetlink_net_init,
3371 .exit_batch = ctnetlink_net_exit_batch,
3372 };
3373
ctnetlink_init(void)3374 static int __init ctnetlink_init(void)
3375 {
3376 int ret;
3377
3378 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3379 ret = nfnetlink_subsys_register(&ctnl_subsys);
3380 if (ret < 0) {
3381 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3382 goto err_out;
3383 }
3384
3385 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3386 if (ret < 0) {
3387 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3388 goto err_unreg_subsys;
3389 }
3390
3391 ret = register_pernet_subsys(&ctnetlink_net_ops);
3392 if (ret < 0) {
3393 pr_err("ctnetlink_init: cannot register pernet operations\n");
3394 goto err_unreg_exp_subsys;
3395 }
3396 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3397 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3398 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3399 #endif
3400 return 0;
3401
3402 err_unreg_exp_subsys:
3403 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3404 err_unreg_subsys:
3405 nfnetlink_subsys_unregister(&ctnl_subsys);
3406 err_out:
3407 return ret;
3408 }
3409
ctnetlink_exit(void)3410 static void __exit ctnetlink_exit(void)
3411 {
3412 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3413
3414 unregister_pernet_subsys(&ctnetlink_net_ops);
3415 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3416 nfnetlink_subsys_unregister(&ctnl_subsys);
3417 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3418 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3419 #endif
3420 synchronize_rcu();
3421 }
3422
3423 module_init(ctnetlink_init);
3424 module_exit(ctnetlink_exit);
3425