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netlink: Rename pid to portid to avoid confusion
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 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_l3proto.h>
41 #include <net/netfilter/nf_conntrack_l4proto.h>
42 #include <net/netfilter/nf_conntrack_tuple.h>
43 #include <net/netfilter/nf_conntrack_acct.h>
44 #include <net/netfilter/nf_conntrack_zones.h>
45 #include <net/netfilter/nf_conntrack_timestamp.h>
46 #ifdef CONFIG_NF_NAT_NEEDED
47 #include <net/netfilter/nf_nat_core.h>
48 #include <net/netfilter/nf_nat_l4proto.h>
49 #include <net/netfilter/nf_nat_helper.h>
50 #endif
51
52 #include <linux/netfilter/nfnetlink.h>
53 #include <linux/netfilter/nfnetlink_conntrack.h>
54
55 MODULE_LICENSE("GPL");
56
57 static char __initdata version[] = "0.93";
58
59 static inline int
60 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
61 const struct nf_conntrack_tuple *tuple,
62 struct nf_conntrack_l4proto *l4proto)
63 {
64 int ret = 0;
65 struct nlattr *nest_parms;
66
67 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
68 if (!nest_parms)
69 goto nla_put_failure;
70 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
71 goto nla_put_failure;
72
73 if (likely(l4proto->tuple_to_nlattr))
74 ret = l4proto->tuple_to_nlattr(skb, tuple);
75
76 nla_nest_end(skb, nest_parms);
77
78 return ret;
79
80 nla_put_failure:
81 return -1;
82 }
83
84 static inline int
85 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
86 const struct nf_conntrack_tuple *tuple,
87 struct nf_conntrack_l3proto *l3proto)
88 {
89 int ret = 0;
90 struct nlattr *nest_parms;
91
92 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
93 if (!nest_parms)
94 goto nla_put_failure;
95
96 if (likely(l3proto->tuple_to_nlattr))
97 ret = l3proto->tuple_to_nlattr(skb, tuple);
98
99 nla_nest_end(skb, nest_parms);
100
101 return ret;
102
103 nla_put_failure:
104 return -1;
105 }
106
107 static int
108 ctnetlink_dump_tuples(struct sk_buff *skb,
109 const struct nf_conntrack_tuple *tuple)
110 {
111 int ret;
112 struct nf_conntrack_l3proto *l3proto;
113 struct nf_conntrack_l4proto *l4proto;
114
115 rcu_read_lock();
116 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
117 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
118
119 if (ret >= 0) {
120 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
121 tuple->dst.protonum);
122 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
123 }
124 rcu_read_unlock();
125 return ret;
126 }
127
128 static inline int
129 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
130 {
131 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
132 goto nla_put_failure;
133 return 0;
134
135 nla_put_failure:
136 return -1;
137 }
138
139 static inline int
140 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
141 {
142 long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
143
144 if (timeout < 0)
145 timeout = 0;
146
147 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
148 goto nla_put_failure;
149 return 0;
150
151 nla_put_failure:
152 return -1;
153 }
154
155 static inline int
156 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
157 {
158 struct nf_conntrack_l4proto *l4proto;
159 struct nlattr *nest_proto;
160 int ret;
161
162 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
163 if (!l4proto->to_nlattr)
164 return 0;
165
166 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
167 if (!nest_proto)
168 goto nla_put_failure;
169
170 ret = l4proto->to_nlattr(skb, nest_proto, ct);
171
172 nla_nest_end(skb, nest_proto);
173
174 return ret;
175
176 nla_put_failure:
177 return -1;
178 }
179
180 static inline int
181 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
182 {
183 struct nlattr *nest_helper;
184 const struct nf_conn_help *help = nfct_help(ct);
185 struct nf_conntrack_helper *helper;
186
187 if (!help)
188 return 0;
189
190 helper = rcu_dereference(help->helper);
191 if (!helper)
192 goto out;
193
194 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
195 if (!nest_helper)
196 goto nla_put_failure;
197 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
198 goto nla_put_failure;
199
200 if (helper->to_nlattr)
201 helper->to_nlattr(skb, ct);
202
203 nla_nest_end(skb, nest_helper);
204 out:
205 return 0;
206
207 nla_put_failure:
208 return -1;
209 }
210
211 static int
212 dump_counters(struct sk_buff *skb, u64 pkts, u64 bytes,
213 enum ip_conntrack_dir dir)
214 {
215 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
216 struct nlattr *nest_count;
217
218 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
219 if (!nest_count)
220 goto nla_put_failure;
221
222 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
223 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
224 goto nla_put_failure;
225
226 nla_nest_end(skb, nest_count);
227
228 return 0;
229
230 nla_put_failure:
231 return -1;
232 }
233
234 static int
235 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
236 enum ip_conntrack_dir dir, int type)
237 {
238 struct nf_conn_counter *acct;
239 u64 pkts, bytes;
240
241 acct = nf_conn_acct_find(ct);
242 if (!acct)
243 return 0;
244
245 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
246 pkts = atomic64_xchg(&acct[dir].packets, 0);
247 bytes = atomic64_xchg(&acct[dir].bytes, 0);
248 } else {
249 pkts = atomic64_read(&acct[dir].packets);
250 bytes = atomic64_read(&acct[dir].bytes);
251 }
252 return dump_counters(skb, pkts, bytes, dir);
253 }
254
255 static int
256 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
257 {
258 struct nlattr *nest_count;
259 const struct nf_conn_tstamp *tstamp;
260
261 tstamp = nf_conn_tstamp_find(ct);
262 if (!tstamp)
263 return 0;
264
265 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
266 if (!nest_count)
267 goto nla_put_failure;
268
269 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
270 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
271 cpu_to_be64(tstamp->stop))))
272 goto nla_put_failure;
273 nla_nest_end(skb, nest_count);
274
275 return 0;
276
277 nla_put_failure:
278 return -1;
279 }
280
281 #ifdef CONFIG_NF_CONNTRACK_MARK
282 static inline int
283 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
284 {
285 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
286 goto nla_put_failure;
287 return 0;
288
289 nla_put_failure:
290 return -1;
291 }
292 #else
293 #define ctnetlink_dump_mark(a, b) (0)
294 #endif
295
296 #ifdef CONFIG_NF_CONNTRACK_SECMARK
297 static inline int
298 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
299 {
300 struct nlattr *nest_secctx;
301 int len, ret;
302 char *secctx;
303
304 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
305 if (ret)
306 return 0;
307
308 ret = -1;
309 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
310 if (!nest_secctx)
311 goto nla_put_failure;
312
313 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
314 goto nla_put_failure;
315 nla_nest_end(skb, nest_secctx);
316
317 ret = 0;
318 nla_put_failure:
319 security_release_secctx(secctx, len);
320 return ret;
321 }
322 #else
323 #define ctnetlink_dump_secctx(a, b) (0)
324 #endif
325
326 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
327
328 static inline int
329 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
330 {
331 struct nlattr *nest_parms;
332
333 if (!(ct->status & IPS_EXPECTED))
334 return 0;
335
336 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
337 if (!nest_parms)
338 goto nla_put_failure;
339 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
340 goto nla_put_failure;
341 nla_nest_end(skb, nest_parms);
342
343 return 0;
344
345 nla_put_failure:
346 return -1;
347 }
348
349 #ifdef CONFIG_NF_NAT_NEEDED
350 static int
351 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
352 {
353 struct nlattr *nest_parms;
354
355 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
356 if (!nest_parms)
357 goto nla_put_failure;
358
359 if (nla_put_be32(skb, CTA_NAT_SEQ_CORRECTION_POS,
360 htonl(natseq->correction_pos)) ||
361 nla_put_be32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
362 htonl(natseq->offset_before)) ||
363 nla_put_be32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
364 htonl(natseq->offset_after)))
365 goto nla_put_failure;
366
367 nla_nest_end(skb, nest_parms);
368
369 return 0;
370
371 nla_put_failure:
372 return -1;
373 }
374
375 static inline int
376 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
377 {
378 struct nf_nat_seq *natseq;
379 struct nf_conn_nat *nat = nfct_nat(ct);
380
381 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
382 return 0;
383
384 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
385 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
386 return -1;
387
388 natseq = &nat->seq[IP_CT_DIR_REPLY];
389 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
390 return -1;
391
392 return 0;
393 }
394 #else
395 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
396 #endif
397
398 static inline int
399 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
400 {
401 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
402 goto nla_put_failure;
403 return 0;
404
405 nla_put_failure:
406 return -1;
407 }
408
409 static inline int
410 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
411 {
412 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
413 goto nla_put_failure;
414 return 0;
415
416 nla_put_failure:
417 return -1;
418 }
419
420 static int
421 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
422 struct nf_conn *ct)
423 {
424 struct nlmsghdr *nlh;
425 struct nfgenmsg *nfmsg;
426 struct nlattr *nest_parms;
427 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
428
429 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
430 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
431 if (nlh == NULL)
432 goto nlmsg_failure;
433
434 nfmsg = nlmsg_data(nlh);
435 nfmsg->nfgen_family = nf_ct_l3num(ct);
436 nfmsg->version = NFNETLINK_V0;
437 nfmsg->res_id = 0;
438
439 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
440 if (!nest_parms)
441 goto nla_put_failure;
442 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
443 goto nla_put_failure;
444 nla_nest_end(skb, nest_parms);
445
446 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
447 if (!nest_parms)
448 goto nla_put_failure;
449 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
450 goto nla_put_failure;
451 nla_nest_end(skb, nest_parms);
452
453 if (nf_ct_zone(ct) &&
454 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
455 goto nla_put_failure;
456
457 if (ctnetlink_dump_status(skb, ct) < 0 ||
458 ctnetlink_dump_timeout(skb, ct) < 0 ||
459 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL, type) < 0 ||
460 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY, type) < 0 ||
461 ctnetlink_dump_timestamp(skb, ct) < 0 ||
462 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
463 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
464 ctnetlink_dump_mark(skb, ct) < 0 ||
465 ctnetlink_dump_secctx(skb, ct) < 0 ||
466 ctnetlink_dump_id(skb, ct) < 0 ||
467 ctnetlink_dump_use(skb, ct) < 0 ||
468 ctnetlink_dump_master(skb, ct) < 0 ||
469 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
470 goto nla_put_failure;
471
472 nlmsg_end(skb, nlh);
473 return skb->len;
474
475 nlmsg_failure:
476 nla_put_failure:
477 nlmsg_cancel(skb, nlh);
478 return -1;
479 }
480
481 static inline size_t
482 ctnetlink_proto_size(const struct nf_conn *ct)
483 {
484 struct nf_conntrack_l3proto *l3proto;
485 struct nf_conntrack_l4proto *l4proto;
486 size_t len = 0;
487
488 rcu_read_lock();
489 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
490 len += l3proto->nla_size;
491
492 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
493 len += l4proto->nla_size;
494 rcu_read_unlock();
495
496 return len;
497 }
498
499 static inline size_t
500 ctnetlink_counters_size(const struct nf_conn *ct)
501 {
502 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
503 return 0;
504 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
505 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
506 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
507 ;
508 }
509
510 static inline int
511 ctnetlink_secctx_size(const struct nf_conn *ct)
512 {
513 #ifdef CONFIG_NF_CONNTRACK_SECMARK
514 int len, ret;
515
516 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
517 if (ret)
518 return 0;
519
520 return nla_total_size(0) /* CTA_SECCTX */
521 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
522 #else
523 return 0;
524 #endif
525 }
526
527 static inline size_t
528 ctnetlink_timestamp_size(const struct nf_conn *ct)
529 {
530 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
531 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
532 return 0;
533 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
534 #else
535 return 0;
536 #endif
537 }
538
539 static inline size_t
540 ctnetlink_nlmsg_size(const struct nf_conn *ct)
541 {
542 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
543 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
544 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
545 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
546 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
547 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
548 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
549 + ctnetlink_counters_size(ct)
550 + ctnetlink_timestamp_size(ct)
551 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
552 + nla_total_size(0) /* CTA_PROTOINFO */
553 + nla_total_size(0) /* CTA_HELP */
554 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
555 + ctnetlink_secctx_size(ct)
556 #ifdef CONFIG_NF_NAT_NEEDED
557 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
558 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
559 #endif
560 #ifdef CONFIG_NF_CONNTRACK_MARK
561 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
562 #endif
563 + ctnetlink_proto_size(ct)
564 ;
565 }
566
567 #ifdef CONFIG_NF_CONNTRACK_EVENTS
568 static int
569 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
570 {
571 struct net *net;
572 struct nlmsghdr *nlh;
573 struct nfgenmsg *nfmsg;
574 struct nlattr *nest_parms;
575 struct nf_conn *ct = item->ct;
576 struct sk_buff *skb;
577 unsigned int type;
578 unsigned int flags = 0, group;
579 int err;
580
581 /* ignore our fake conntrack entry */
582 if (nf_ct_is_untracked(ct))
583 return 0;
584
585 if (events & (1 << IPCT_DESTROY)) {
586 type = IPCTNL_MSG_CT_DELETE;
587 group = NFNLGRP_CONNTRACK_DESTROY;
588 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
589 type = IPCTNL_MSG_CT_NEW;
590 flags = NLM_F_CREATE|NLM_F_EXCL;
591 group = NFNLGRP_CONNTRACK_NEW;
592 } else if (events) {
593 type = IPCTNL_MSG_CT_NEW;
594 group = NFNLGRP_CONNTRACK_UPDATE;
595 } else
596 return 0;
597
598 net = nf_ct_net(ct);
599 if (!item->report && !nfnetlink_has_listeners(net, group))
600 return 0;
601
602 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
603 if (skb == NULL)
604 goto errout;
605
606 type |= NFNL_SUBSYS_CTNETLINK << 8;
607 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
608 if (nlh == NULL)
609 goto nlmsg_failure;
610
611 nfmsg = nlmsg_data(nlh);
612 nfmsg->nfgen_family = nf_ct_l3num(ct);
613 nfmsg->version = NFNETLINK_V0;
614 nfmsg->res_id = 0;
615
616 rcu_read_lock();
617 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
618 if (!nest_parms)
619 goto nla_put_failure;
620 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
621 goto nla_put_failure;
622 nla_nest_end(skb, nest_parms);
623
624 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
625 if (!nest_parms)
626 goto nla_put_failure;
627 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
628 goto nla_put_failure;
629 nla_nest_end(skb, nest_parms);
630
631 if (nf_ct_zone(ct) &&
632 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
633 goto nla_put_failure;
634
635 if (ctnetlink_dump_id(skb, ct) < 0)
636 goto nla_put_failure;
637
638 if (ctnetlink_dump_status(skb, ct) < 0)
639 goto nla_put_failure;
640
641 if (events & (1 << IPCT_DESTROY)) {
642 if (ctnetlink_dump_counters(skb, ct,
643 IP_CT_DIR_ORIGINAL, type) < 0 ||
644 ctnetlink_dump_counters(skb, ct,
645 IP_CT_DIR_REPLY, type) < 0 ||
646 ctnetlink_dump_timestamp(skb, ct) < 0)
647 goto nla_put_failure;
648 } else {
649 if (ctnetlink_dump_timeout(skb, ct) < 0)
650 goto nla_put_failure;
651
652 if (events & (1 << IPCT_PROTOINFO)
653 && ctnetlink_dump_protoinfo(skb, ct) < 0)
654 goto nla_put_failure;
655
656 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
657 && ctnetlink_dump_helpinfo(skb, ct) < 0)
658 goto nla_put_failure;
659
660 #ifdef CONFIG_NF_CONNTRACK_SECMARK
661 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
662 && ctnetlink_dump_secctx(skb, ct) < 0)
663 goto nla_put_failure;
664 #endif
665
666 if (events & (1 << IPCT_RELATED) &&
667 ctnetlink_dump_master(skb, ct) < 0)
668 goto nla_put_failure;
669
670 if (events & (1 << IPCT_NATSEQADJ) &&
671 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
672 goto nla_put_failure;
673 }
674
675 #ifdef CONFIG_NF_CONNTRACK_MARK
676 if ((events & (1 << IPCT_MARK) || ct->mark)
677 && ctnetlink_dump_mark(skb, ct) < 0)
678 goto nla_put_failure;
679 #endif
680 rcu_read_unlock();
681
682 nlmsg_end(skb, nlh);
683 err = nfnetlink_send(skb, net, item->portid, group, item->report,
684 GFP_ATOMIC);
685 if (err == -ENOBUFS || err == -EAGAIN)
686 return -ENOBUFS;
687
688 return 0;
689
690 nla_put_failure:
691 rcu_read_unlock();
692 nlmsg_cancel(skb, nlh);
693 nlmsg_failure:
694 kfree_skb(skb);
695 errout:
696 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
697 return -ENOBUFS;
698
699 return 0;
700 }
701 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
702
703 static int ctnetlink_done(struct netlink_callback *cb)
704 {
705 if (cb->args[1])
706 nf_ct_put((struct nf_conn *)cb->args[1]);
707 if (cb->data)
708 kfree(cb->data);
709 return 0;
710 }
711
712 struct ctnetlink_dump_filter {
713 struct {
714 u_int32_t val;
715 u_int32_t mask;
716 } mark;
717 };
718
719 static int
720 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
721 {
722 struct net *net = sock_net(skb->sk);
723 struct nf_conn *ct, *last;
724 struct nf_conntrack_tuple_hash *h;
725 struct hlist_nulls_node *n;
726 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
727 u_int8_t l3proto = nfmsg->nfgen_family;
728 int res;
729 #ifdef CONFIG_NF_CONNTRACK_MARK
730 const struct ctnetlink_dump_filter *filter = cb->data;
731 #endif
732
733 spin_lock_bh(&nf_conntrack_lock);
734 last = (struct nf_conn *)cb->args[1];
735 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
736 restart:
737 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
738 hnnode) {
739 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
740 continue;
741 ct = nf_ct_tuplehash_to_ctrack(h);
742 /* Dump entries of a given L3 protocol number.
743 * If it is not specified, ie. l3proto == 0,
744 * then dump everything. */
745 if (l3proto && nf_ct_l3num(ct) != l3proto)
746 continue;
747 if (cb->args[1]) {
748 if (ct != last)
749 continue;
750 cb->args[1] = 0;
751 }
752 #ifdef CONFIG_NF_CONNTRACK_MARK
753 if (filter && !((ct->mark & filter->mark.mask) ==
754 filter->mark.val)) {
755 continue;
756 }
757 #endif
758 rcu_read_lock();
759 res =
760 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
761 cb->nlh->nlmsg_seq,
762 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
763 ct);
764 rcu_read_unlock();
765 if (res < 0) {
766 nf_conntrack_get(&ct->ct_general);
767 cb->args[1] = (unsigned long)ct;
768 goto out;
769 }
770 }
771 if (cb->args[1]) {
772 cb->args[1] = 0;
773 goto restart;
774 }
775 }
776 out:
777 spin_unlock_bh(&nf_conntrack_lock);
778 if (last)
779 nf_ct_put(last);
780
781 return skb->len;
782 }
783
784 static inline int
785 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
786 {
787 struct nlattr *tb[CTA_IP_MAX+1];
788 struct nf_conntrack_l3proto *l3proto;
789 int ret = 0;
790
791 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
792
793 rcu_read_lock();
794 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
795
796 if (likely(l3proto->nlattr_to_tuple)) {
797 ret = nla_validate_nested(attr, CTA_IP_MAX,
798 l3proto->nla_policy);
799 if (ret == 0)
800 ret = l3proto->nlattr_to_tuple(tb, tuple);
801 }
802
803 rcu_read_unlock();
804
805 return ret;
806 }
807
808 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
809 [CTA_PROTO_NUM] = { .type = NLA_U8 },
810 };
811
812 static inline int
813 ctnetlink_parse_tuple_proto(struct nlattr *attr,
814 struct nf_conntrack_tuple *tuple)
815 {
816 struct nlattr *tb[CTA_PROTO_MAX+1];
817 struct nf_conntrack_l4proto *l4proto;
818 int ret = 0;
819
820 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
821 if (ret < 0)
822 return ret;
823
824 if (!tb[CTA_PROTO_NUM])
825 return -EINVAL;
826 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
827
828 rcu_read_lock();
829 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
830
831 if (likely(l4proto->nlattr_to_tuple)) {
832 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
833 l4proto->nla_policy);
834 if (ret == 0)
835 ret = l4proto->nlattr_to_tuple(tb, tuple);
836 }
837
838 rcu_read_unlock();
839
840 return ret;
841 }
842
843 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
844 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
845 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
846 };
847
848 static int
849 ctnetlink_parse_tuple(const struct nlattr * const cda[],
850 struct nf_conntrack_tuple *tuple,
851 enum ctattr_type type, u_int8_t l3num)
852 {
853 struct nlattr *tb[CTA_TUPLE_MAX+1];
854 int err;
855
856 memset(tuple, 0, sizeof(*tuple));
857
858 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
859
860 if (!tb[CTA_TUPLE_IP])
861 return -EINVAL;
862
863 tuple->src.l3num = l3num;
864
865 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
866 if (err < 0)
867 return err;
868
869 if (!tb[CTA_TUPLE_PROTO])
870 return -EINVAL;
871
872 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
873 if (err < 0)
874 return err;
875
876 /* orig and expect tuples get DIR_ORIGINAL */
877 if (type == CTA_TUPLE_REPLY)
878 tuple->dst.dir = IP_CT_DIR_REPLY;
879 else
880 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
881
882 return 0;
883 }
884
885 static int
886 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
887 {
888 if (attr)
889 #ifdef CONFIG_NF_CONNTRACK_ZONES
890 *zone = ntohs(nla_get_be16(attr));
891 #else
892 return -EOPNOTSUPP;
893 #endif
894 else
895 *zone = 0;
896
897 return 0;
898 }
899
900 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
901 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
902 };
903
904 static inline int
905 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
906 struct nlattr **helpinfo)
907 {
908 struct nlattr *tb[CTA_HELP_MAX+1];
909
910 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
911
912 if (!tb[CTA_HELP_NAME])
913 return -EINVAL;
914
915 *helper_name = nla_data(tb[CTA_HELP_NAME]);
916
917 if (tb[CTA_HELP_INFO])
918 *helpinfo = tb[CTA_HELP_INFO];
919
920 return 0;
921 }
922
923 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
924 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
925 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
926 [CTA_STATUS] = { .type = NLA_U32 },
927 [CTA_PROTOINFO] = { .type = NLA_NESTED },
928 [CTA_HELP] = { .type = NLA_NESTED },
929 [CTA_NAT_SRC] = { .type = NLA_NESTED },
930 [CTA_TIMEOUT] = { .type = NLA_U32 },
931 [CTA_MARK] = { .type = NLA_U32 },
932 [CTA_ID] = { .type = NLA_U32 },
933 [CTA_NAT_DST] = { .type = NLA_NESTED },
934 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
935 [CTA_ZONE] = { .type = NLA_U16 },
936 [CTA_MARK_MASK] = { .type = NLA_U32 },
937 };
938
939 static int
940 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
941 const struct nlmsghdr *nlh,
942 const struct nlattr * const cda[])
943 {
944 struct net *net = sock_net(ctnl);
945 struct nf_conntrack_tuple_hash *h;
946 struct nf_conntrack_tuple tuple;
947 struct nf_conn *ct;
948 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
949 u_int8_t u3 = nfmsg->nfgen_family;
950 u16 zone;
951 int err;
952
953 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
954 if (err < 0)
955 return err;
956
957 if (cda[CTA_TUPLE_ORIG])
958 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
959 else if (cda[CTA_TUPLE_REPLY])
960 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
961 else {
962 /* Flush the whole table */
963 nf_conntrack_flush_report(net,
964 NETLINK_CB(skb).portid,
965 nlmsg_report(nlh));
966 return 0;
967 }
968
969 if (err < 0)
970 return err;
971
972 h = nf_conntrack_find_get(net, zone, &tuple);
973 if (!h)
974 return -ENOENT;
975
976 ct = nf_ct_tuplehash_to_ctrack(h);
977
978 if (cda[CTA_ID]) {
979 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
980 if (id != (u32)(unsigned long)ct) {
981 nf_ct_put(ct);
982 return -ENOENT;
983 }
984 }
985
986 if (del_timer(&ct->timeout)) {
987 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
988 NETLINK_CB(skb).portid,
989 nlmsg_report(nlh)) < 0) {
990 nf_ct_delete_from_lists(ct);
991 /* we failed to report the event, try later */
992 nf_ct_insert_dying_list(ct);
993 nf_ct_put(ct);
994 return 0;
995 }
996 /* death_by_timeout would report the event again */
997 set_bit(IPS_DYING_BIT, &ct->status);
998 nf_ct_delete_from_lists(ct);
999 nf_ct_put(ct);
1000 }
1001 nf_ct_put(ct);
1002
1003 return 0;
1004 }
1005
1006 static int
1007 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1008 const struct nlmsghdr *nlh,
1009 const struct nlattr * const cda[])
1010 {
1011 struct net *net = sock_net(ctnl);
1012 struct nf_conntrack_tuple_hash *h;
1013 struct nf_conntrack_tuple tuple;
1014 struct nf_conn *ct;
1015 struct sk_buff *skb2 = NULL;
1016 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1017 u_int8_t u3 = nfmsg->nfgen_family;
1018 u16 zone;
1019 int err;
1020
1021 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1022 struct netlink_dump_control c = {
1023 .dump = ctnetlink_dump_table,
1024 .done = ctnetlink_done,
1025 };
1026 #ifdef CONFIG_NF_CONNTRACK_MARK
1027 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1028 struct ctnetlink_dump_filter *filter;
1029
1030 filter = kzalloc(sizeof(struct ctnetlink_dump_filter),
1031 GFP_ATOMIC);
1032 if (filter == NULL)
1033 return -ENOMEM;
1034
1035 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
1036 filter->mark.mask =
1037 ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1038 c.data = filter;
1039 }
1040 #endif
1041 return netlink_dump_start(ctnl, skb, nlh, &c);
1042 }
1043
1044 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1045 if (err < 0)
1046 return err;
1047
1048 if (cda[CTA_TUPLE_ORIG])
1049 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1050 else if (cda[CTA_TUPLE_REPLY])
1051 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1052 else
1053 return -EINVAL;
1054
1055 if (err < 0)
1056 return err;
1057
1058 h = nf_conntrack_find_get(net, zone, &tuple);
1059 if (!h)
1060 return -ENOENT;
1061
1062 ct = nf_ct_tuplehash_to_ctrack(h);
1063
1064 err = -ENOMEM;
1065 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1066 if (skb2 == NULL) {
1067 nf_ct_put(ct);
1068 return -ENOMEM;
1069 }
1070
1071 rcu_read_lock();
1072 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1073 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1074 rcu_read_unlock();
1075 nf_ct_put(ct);
1076 if (err <= 0)
1077 goto free;
1078
1079 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1080 if (err < 0)
1081 goto out;
1082
1083 return 0;
1084
1085 free:
1086 kfree_skb(skb2);
1087 out:
1088 /* this avoids a loop in nfnetlink. */
1089 return err == -EAGAIN ? -ENOBUFS : err;
1090 }
1091
1092 #ifdef CONFIG_NF_NAT_NEEDED
1093 static int
1094 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1095 enum nf_nat_manip_type manip,
1096 const struct nlattr *attr)
1097 {
1098 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1099 int err;
1100
1101 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1102 if (!parse_nat_setup) {
1103 #ifdef CONFIG_MODULES
1104 rcu_read_unlock();
1105 nfnl_unlock();
1106 if (request_module("nf-nat") < 0) {
1107 nfnl_lock();
1108 rcu_read_lock();
1109 return -EOPNOTSUPP;
1110 }
1111 nfnl_lock();
1112 rcu_read_lock();
1113 if (nfnetlink_parse_nat_setup_hook)
1114 return -EAGAIN;
1115 #endif
1116 return -EOPNOTSUPP;
1117 }
1118
1119 err = parse_nat_setup(ct, manip, attr);
1120 if (err == -EAGAIN) {
1121 #ifdef CONFIG_MODULES
1122 rcu_read_unlock();
1123 spin_unlock_bh(&nf_conntrack_lock);
1124 nfnl_unlock();
1125 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1126 nfnl_lock();
1127 spin_lock_bh(&nf_conntrack_lock);
1128 rcu_read_lock();
1129 return -EOPNOTSUPP;
1130 }
1131 nfnl_lock();
1132 spin_lock_bh(&nf_conntrack_lock);
1133 rcu_read_lock();
1134 #else
1135 err = -EOPNOTSUPP;
1136 #endif
1137 }
1138 return err;
1139 }
1140 #endif
1141
1142 static int
1143 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1144 {
1145 unsigned long d;
1146 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1147 d = ct->status ^ status;
1148
1149 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1150 /* unchangeable */
1151 return -EBUSY;
1152
1153 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1154 /* SEEN_REPLY bit can only be set */
1155 return -EBUSY;
1156
1157 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1158 /* ASSURED bit can only be set */
1159 return -EBUSY;
1160
1161 /* Be careful here, modifying NAT bits can screw up things,
1162 * so don't let users modify them directly if they don't pass
1163 * nf_nat_range. */
1164 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1165 return 0;
1166 }
1167
1168 static int
1169 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1170 {
1171 #ifdef CONFIG_NF_NAT_NEEDED
1172 int ret;
1173
1174 if (cda[CTA_NAT_DST]) {
1175 ret = ctnetlink_parse_nat_setup(ct,
1176 NF_NAT_MANIP_DST,
1177 cda[CTA_NAT_DST]);
1178 if (ret < 0)
1179 return ret;
1180 }
1181 if (cda[CTA_NAT_SRC]) {
1182 ret = ctnetlink_parse_nat_setup(ct,
1183 NF_NAT_MANIP_SRC,
1184 cda[CTA_NAT_SRC]);
1185 if (ret < 0)
1186 return ret;
1187 }
1188 return 0;
1189 #else
1190 return -EOPNOTSUPP;
1191 #endif
1192 }
1193
1194 static inline int
1195 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1196 {
1197 struct nf_conntrack_helper *helper;
1198 struct nf_conn_help *help = nfct_help(ct);
1199 char *helpname = NULL;
1200 struct nlattr *helpinfo = NULL;
1201 int err;
1202
1203 /* don't change helper of sibling connections */
1204 if (ct->master)
1205 return -EBUSY;
1206
1207 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1208 if (err < 0)
1209 return err;
1210
1211 if (!strcmp(helpname, "")) {
1212 if (help && help->helper) {
1213 /* we had a helper before ... */
1214 nf_ct_remove_expectations(ct);
1215 RCU_INIT_POINTER(help->helper, NULL);
1216 }
1217
1218 return 0;
1219 }
1220
1221 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1222 nf_ct_protonum(ct));
1223 if (helper == NULL) {
1224 #ifdef CONFIG_MODULES
1225 spin_unlock_bh(&nf_conntrack_lock);
1226
1227 if (request_module("nfct-helper-%s", helpname) < 0) {
1228 spin_lock_bh(&nf_conntrack_lock);
1229 return -EOPNOTSUPP;
1230 }
1231
1232 spin_lock_bh(&nf_conntrack_lock);
1233 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1234 nf_ct_protonum(ct));
1235 if (helper)
1236 return -EAGAIN;
1237 #endif
1238 return -EOPNOTSUPP;
1239 }
1240
1241 if (help) {
1242 if (help->helper == helper) {
1243 /* update private helper data if allowed. */
1244 if (helper->from_nlattr && helpinfo)
1245 helper->from_nlattr(helpinfo, ct);
1246 return 0;
1247 } else
1248 return -EBUSY;
1249 }
1250
1251 /* we cannot set a helper for an existing conntrack */
1252 return -EOPNOTSUPP;
1253 }
1254
1255 static inline int
1256 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1257 {
1258 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1259
1260 if (!del_timer(&ct->timeout))
1261 return -ETIME;
1262
1263 ct->timeout.expires = jiffies + timeout * HZ;
1264 add_timer(&ct->timeout);
1265
1266 return 0;
1267 }
1268
1269 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1270 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1271 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1272 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1273 };
1274
1275 static inline int
1276 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1277 {
1278 const struct nlattr *attr = cda[CTA_PROTOINFO];
1279 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1280 struct nf_conntrack_l4proto *l4proto;
1281 int err = 0;
1282
1283 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1284
1285 rcu_read_lock();
1286 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1287 if (l4proto->from_nlattr)
1288 err = l4proto->from_nlattr(tb, ct);
1289 rcu_read_unlock();
1290
1291 return err;
1292 }
1293
1294 #ifdef CONFIG_NF_NAT_NEEDED
1295 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1296 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1297 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1298 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1299 };
1300
1301 static inline int
1302 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1303 {
1304 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1305
1306 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1307
1308 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1309 return -EINVAL;
1310
1311 natseq->correction_pos =
1312 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1313
1314 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1315 return -EINVAL;
1316
1317 natseq->offset_before =
1318 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1319
1320 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1321 return -EINVAL;
1322
1323 natseq->offset_after =
1324 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1325
1326 return 0;
1327 }
1328
1329 static int
1330 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1331 const struct nlattr * const cda[])
1332 {
1333 int ret = 0;
1334 struct nf_conn_nat *nat = nfct_nat(ct);
1335
1336 if (!nat)
1337 return 0;
1338
1339 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1340 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1341 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1342 if (ret < 0)
1343 return ret;
1344
1345 ct->status |= IPS_SEQ_ADJUST;
1346 }
1347
1348 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1349 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1350 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1351 if (ret < 0)
1352 return ret;
1353
1354 ct->status |= IPS_SEQ_ADJUST;
1355 }
1356
1357 return 0;
1358 }
1359 #endif
1360
1361 static int
1362 ctnetlink_change_conntrack(struct nf_conn *ct,
1363 const struct nlattr * const cda[])
1364 {
1365 int err;
1366
1367 /* only allow NAT changes and master assignation for new conntracks */
1368 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1369 return -EOPNOTSUPP;
1370
1371 if (cda[CTA_HELP]) {
1372 err = ctnetlink_change_helper(ct, cda);
1373 if (err < 0)
1374 return err;
1375 }
1376
1377 if (cda[CTA_TIMEOUT]) {
1378 err = ctnetlink_change_timeout(ct, cda);
1379 if (err < 0)
1380 return err;
1381 }
1382
1383 if (cda[CTA_STATUS]) {
1384 err = ctnetlink_change_status(ct, cda);
1385 if (err < 0)
1386 return err;
1387 }
1388
1389 if (cda[CTA_PROTOINFO]) {
1390 err = ctnetlink_change_protoinfo(ct, cda);
1391 if (err < 0)
1392 return err;
1393 }
1394
1395 #if defined(CONFIG_NF_CONNTRACK_MARK)
1396 if (cda[CTA_MARK])
1397 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1398 #endif
1399
1400 #ifdef CONFIG_NF_NAT_NEEDED
1401 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1402 err = ctnetlink_change_nat_seq_adj(ct, cda);
1403 if (err < 0)
1404 return err;
1405 }
1406 #endif
1407
1408 return 0;
1409 }
1410
1411 static struct nf_conn *
1412 ctnetlink_create_conntrack(struct net *net, u16 zone,
1413 const struct nlattr * const cda[],
1414 struct nf_conntrack_tuple *otuple,
1415 struct nf_conntrack_tuple *rtuple,
1416 u8 u3)
1417 {
1418 struct nf_conn *ct;
1419 int err = -EINVAL;
1420 struct nf_conntrack_helper *helper;
1421 struct nf_conn_tstamp *tstamp;
1422
1423 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1424 if (IS_ERR(ct))
1425 return ERR_PTR(-ENOMEM);
1426
1427 if (!cda[CTA_TIMEOUT])
1428 goto err1;
1429 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1430
1431 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1432
1433 rcu_read_lock();
1434 if (cda[CTA_HELP]) {
1435 char *helpname = NULL;
1436 struct nlattr *helpinfo = NULL;
1437
1438 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1439 if (err < 0)
1440 goto err2;
1441
1442 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1443 nf_ct_protonum(ct));
1444 if (helper == NULL) {
1445 rcu_read_unlock();
1446 #ifdef CONFIG_MODULES
1447 if (request_module("nfct-helper-%s", helpname) < 0) {
1448 err = -EOPNOTSUPP;
1449 goto err1;
1450 }
1451
1452 rcu_read_lock();
1453 helper = __nf_conntrack_helper_find(helpname,
1454 nf_ct_l3num(ct),
1455 nf_ct_protonum(ct));
1456 if (helper) {
1457 err = -EAGAIN;
1458 goto err2;
1459 }
1460 rcu_read_unlock();
1461 #endif
1462 err = -EOPNOTSUPP;
1463 goto err1;
1464 } else {
1465 struct nf_conn_help *help;
1466
1467 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1468 if (help == NULL) {
1469 err = -ENOMEM;
1470 goto err2;
1471 }
1472 /* set private helper data if allowed. */
1473 if (helper->from_nlattr && helpinfo)
1474 helper->from_nlattr(helpinfo, ct);
1475
1476 /* not in hash table yet so not strictly necessary */
1477 RCU_INIT_POINTER(help->helper, helper);
1478 }
1479 } else {
1480 /* try an implicit helper assignation */
1481 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1482 if (err < 0)
1483 goto err2;
1484 }
1485
1486 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1487 err = ctnetlink_change_nat(ct, cda);
1488 if (err < 0)
1489 goto err2;
1490 }
1491
1492 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1493 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1494 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1495 /* we must add conntrack extensions before confirmation. */
1496 ct->status |= IPS_CONFIRMED;
1497
1498 if (cda[CTA_STATUS]) {
1499 err = ctnetlink_change_status(ct, cda);
1500 if (err < 0)
1501 goto err2;
1502 }
1503
1504 #ifdef CONFIG_NF_NAT_NEEDED
1505 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1506 err = ctnetlink_change_nat_seq_adj(ct, cda);
1507 if (err < 0)
1508 goto err2;
1509 }
1510 #endif
1511
1512 memset(&ct->proto, 0, sizeof(ct->proto));
1513 if (cda[CTA_PROTOINFO]) {
1514 err = ctnetlink_change_protoinfo(ct, cda);
1515 if (err < 0)
1516 goto err2;
1517 }
1518
1519 #if defined(CONFIG_NF_CONNTRACK_MARK)
1520 if (cda[CTA_MARK])
1521 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1522 #endif
1523
1524 /* setup master conntrack: this is a confirmed expectation */
1525 if (cda[CTA_TUPLE_MASTER]) {
1526 struct nf_conntrack_tuple master;
1527 struct nf_conntrack_tuple_hash *master_h;
1528 struct nf_conn *master_ct;
1529
1530 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1531 if (err < 0)
1532 goto err2;
1533
1534 master_h = nf_conntrack_find_get(net, zone, &master);
1535 if (master_h == NULL) {
1536 err = -ENOENT;
1537 goto err2;
1538 }
1539 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1540 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1541 ct->master = master_ct;
1542 }
1543 tstamp = nf_conn_tstamp_find(ct);
1544 if (tstamp)
1545 tstamp->start = ktime_to_ns(ktime_get_real());
1546
1547 err = nf_conntrack_hash_check_insert(ct);
1548 if (err < 0)
1549 goto err2;
1550
1551 rcu_read_unlock();
1552
1553 return ct;
1554
1555 err2:
1556 rcu_read_unlock();
1557 err1:
1558 nf_conntrack_free(ct);
1559 return ERR_PTR(err);
1560 }
1561
1562 static int
1563 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1564 const struct nlmsghdr *nlh,
1565 const struct nlattr * const cda[])
1566 {
1567 struct net *net = sock_net(ctnl);
1568 struct nf_conntrack_tuple otuple, rtuple;
1569 struct nf_conntrack_tuple_hash *h = NULL;
1570 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1571 struct nf_conn *ct;
1572 u_int8_t u3 = nfmsg->nfgen_family;
1573 u16 zone;
1574 int err;
1575
1576 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1577 if (err < 0)
1578 return err;
1579
1580 if (cda[CTA_TUPLE_ORIG]) {
1581 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1582 if (err < 0)
1583 return err;
1584 }
1585
1586 if (cda[CTA_TUPLE_REPLY]) {
1587 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1588 if (err < 0)
1589 return err;
1590 }
1591
1592 if (cda[CTA_TUPLE_ORIG])
1593 h = nf_conntrack_find_get(net, zone, &otuple);
1594 else if (cda[CTA_TUPLE_REPLY])
1595 h = nf_conntrack_find_get(net, zone, &rtuple);
1596
1597 if (h == NULL) {
1598 err = -ENOENT;
1599 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1600 enum ip_conntrack_events events;
1601
1602 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1603 &rtuple, u3);
1604 if (IS_ERR(ct))
1605 return PTR_ERR(ct);
1606
1607 err = 0;
1608 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1609 events = IPCT_RELATED;
1610 else
1611 events = IPCT_NEW;
1612
1613 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1614 (1 << IPCT_ASSURED) |
1615 (1 << IPCT_HELPER) |
1616 (1 << IPCT_PROTOINFO) |
1617 (1 << IPCT_NATSEQADJ) |
1618 (1 << IPCT_MARK) | events,
1619 ct, NETLINK_CB(skb).portid,
1620 nlmsg_report(nlh));
1621 nf_ct_put(ct);
1622 }
1623
1624 return err;
1625 }
1626 /* implicit 'else' */
1627
1628 err = -EEXIST;
1629 ct = nf_ct_tuplehash_to_ctrack(h);
1630 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1631 spin_lock_bh(&nf_conntrack_lock);
1632 err = ctnetlink_change_conntrack(ct, cda);
1633 spin_unlock_bh(&nf_conntrack_lock);
1634 if (err == 0) {
1635 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1636 (1 << IPCT_ASSURED) |
1637 (1 << IPCT_HELPER) |
1638 (1 << IPCT_PROTOINFO) |
1639 (1 << IPCT_NATSEQADJ) |
1640 (1 << IPCT_MARK),
1641 ct, NETLINK_CB(skb).portid,
1642 nlmsg_report(nlh));
1643 }
1644 }
1645
1646 nf_ct_put(ct);
1647 return err;
1648 }
1649
1650 static int
1651 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1652 __u16 cpu, const struct ip_conntrack_stat *st)
1653 {
1654 struct nlmsghdr *nlh;
1655 struct nfgenmsg *nfmsg;
1656 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1657
1658 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1659 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1660 if (nlh == NULL)
1661 goto nlmsg_failure;
1662
1663 nfmsg = nlmsg_data(nlh);
1664 nfmsg->nfgen_family = AF_UNSPEC;
1665 nfmsg->version = NFNETLINK_V0;
1666 nfmsg->res_id = htons(cpu);
1667
1668 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1669 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1670 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1671 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1672 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1673 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1674 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1675 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1676 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1677 htonl(st->insert_failed)) ||
1678 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1679 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1680 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1681 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1682 htonl(st->search_restart)))
1683 goto nla_put_failure;
1684
1685 nlmsg_end(skb, nlh);
1686 return skb->len;
1687
1688 nla_put_failure:
1689 nlmsg_failure:
1690 nlmsg_cancel(skb, nlh);
1691 return -1;
1692 }
1693
1694 static int
1695 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1696 {
1697 int cpu;
1698 struct net *net = sock_net(skb->sk);
1699
1700 if (cb->args[0] == nr_cpu_ids)
1701 return 0;
1702
1703 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1704 const struct ip_conntrack_stat *st;
1705
1706 if (!cpu_possible(cpu))
1707 continue;
1708
1709 st = per_cpu_ptr(net->ct.stat, cpu);
1710 if (ctnetlink_ct_stat_cpu_fill_info(skb,
1711 NETLINK_CB(cb->skb).portid,
1712 cb->nlh->nlmsg_seq,
1713 cpu, st) < 0)
1714 break;
1715 }
1716 cb->args[0] = cpu;
1717
1718 return skb->len;
1719 }
1720
1721 static int
1722 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
1723 const struct nlmsghdr *nlh,
1724 const struct nlattr * const cda[])
1725 {
1726 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1727 struct netlink_dump_control c = {
1728 .dump = ctnetlink_ct_stat_cpu_dump,
1729 };
1730 return netlink_dump_start(ctnl, skb, nlh, &c);
1731 }
1732
1733 return 0;
1734 }
1735
1736 static int
1737 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
1738 struct net *net)
1739 {
1740 struct nlmsghdr *nlh;
1741 struct nfgenmsg *nfmsg;
1742 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1743 unsigned int nr_conntracks = atomic_read(&net->ct.count);
1744
1745 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
1746 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1747 if (nlh == NULL)
1748 goto nlmsg_failure;
1749
1750 nfmsg = nlmsg_data(nlh);
1751 nfmsg->nfgen_family = AF_UNSPEC;
1752 nfmsg->version = NFNETLINK_V0;
1753 nfmsg->res_id = 0;
1754
1755 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
1756 goto nla_put_failure;
1757
1758 nlmsg_end(skb, nlh);
1759 return skb->len;
1760
1761 nla_put_failure:
1762 nlmsg_failure:
1763 nlmsg_cancel(skb, nlh);
1764 return -1;
1765 }
1766
1767 static int
1768 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
1769 const struct nlmsghdr *nlh,
1770 const struct nlattr * const cda[])
1771 {
1772 struct sk_buff *skb2;
1773 int err;
1774
1775 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1776 if (skb2 == NULL)
1777 return -ENOMEM;
1778
1779 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
1780 nlh->nlmsg_seq,
1781 NFNL_MSG_TYPE(nlh->nlmsg_type),
1782 sock_net(skb->sk));
1783 if (err <= 0)
1784 goto free;
1785
1786 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1787 if (err < 0)
1788 goto out;
1789
1790 return 0;
1791
1792 free:
1793 kfree_skb(skb2);
1794 out:
1795 /* this avoids a loop in nfnetlink. */
1796 return err == -EAGAIN ? -ENOBUFS : err;
1797 }
1798
1799 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
1800 static size_t
1801 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
1802 {
1803 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
1804 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
1805 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
1806 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
1807 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
1808 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
1809 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
1810 + nla_total_size(0) /* CTA_PROTOINFO */
1811 + nla_total_size(0) /* CTA_HELP */
1812 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
1813 + ctnetlink_secctx_size(ct)
1814 #ifdef CONFIG_NF_NAT_NEEDED
1815 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
1816 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
1817 #endif
1818 #ifdef CONFIG_NF_CONNTRACK_MARK
1819 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
1820 #endif
1821 + ctnetlink_proto_size(ct)
1822 ;
1823 }
1824
1825 static int
1826 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
1827 {
1828 struct nlattr *nest_parms;
1829
1830 rcu_read_lock();
1831 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
1832 if (!nest_parms)
1833 goto nla_put_failure;
1834 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
1835 goto nla_put_failure;
1836 nla_nest_end(skb, nest_parms);
1837
1838 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
1839 if (!nest_parms)
1840 goto nla_put_failure;
1841 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
1842 goto nla_put_failure;
1843 nla_nest_end(skb, nest_parms);
1844
1845 if (nf_ct_zone(ct)) {
1846 if (nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
1847 goto nla_put_failure;
1848 }
1849
1850 if (ctnetlink_dump_id(skb, ct) < 0)
1851 goto nla_put_failure;
1852
1853 if (ctnetlink_dump_status(skb, ct) < 0)
1854 goto nla_put_failure;
1855
1856 if (ctnetlink_dump_timeout(skb, ct) < 0)
1857 goto nla_put_failure;
1858
1859 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
1860 goto nla_put_failure;
1861
1862 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
1863 goto nla_put_failure;
1864
1865 #ifdef CONFIG_NF_CONNTRACK_SECMARK
1866 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
1867 goto nla_put_failure;
1868 #endif
1869 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
1870 goto nla_put_failure;
1871
1872 if ((ct->status & IPS_SEQ_ADJUST) &&
1873 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
1874 goto nla_put_failure;
1875
1876 #ifdef CONFIG_NF_CONNTRACK_MARK
1877 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
1878 goto nla_put_failure;
1879 #endif
1880 rcu_read_unlock();
1881 return 0;
1882
1883 nla_put_failure:
1884 rcu_read_unlock();
1885 return -ENOSPC;
1886 }
1887
1888 static int
1889 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
1890 {
1891 int err;
1892
1893 if (cda[CTA_TIMEOUT]) {
1894 err = ctnetlink_change_timeout(ct, cda);
1895 if (err < 0)
1896 return err;
1897 }
1898 if (cda[CTA_STATUS]) {
1899 err = ctnetlink_change_status(ct, cda);
1900 if (err < 0)
1901 return err;
1902 }
1903 if (cda[CTA_HELP]) {
1904 err = ctnetlink_change_helper(ct, cda);
1905 if (err < 0)
1906 return err;
1907 }
1908 #if defined(CONFIG_NF_CONNTRACK_MARK)
1909 if (cda[CTA_MARK])
1910 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1911 #endif
1912 return 0;
1913 }
1914
1915 static int
1916 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
1917 {
1918 struct nlattr *cda[CTA_MAX+1];
1919 int ret;
1920
1921 nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
1922
1923 spin_lock_bh(&nf_conntrack_lock);
1924 ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
1925 spin_unlock_bh(&nf_conntrack_lock);
1926
1927 return ret;
1928 }
1929
1930 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
1931 .build_size = ctnetlink_nfqueue_build_size,
1932 .build = ctnetlink_nfqueue_build,
1933 .parse = ctnetlink_nfqueue_parse,
1934 };
1935 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
1936
1937 /***********************************************************************
1938 * EXPECT
1939 ***********************************************************************/
1940
1941 static inline int
1942 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1943 const struct nf_conntrack_tuple *tuple,
1944 enum ctattr_expect type)
1945 {
1946 struct nlattr *nest_parms;
1947
1948 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1949 if (!nest_parms)
1950 goto nla_put_failure;
1951 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1952 goto nla_put_failure;
1953 nla_nest_end(skb, nest_parms);
1954
1955 return 0;
1956
1957 nla_put_failure:
1958 return -1;
1959 }
1960
1961 static inline int
1962 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1963 const struct nf_conntrack_tuple *tuple,
1964 const struct nf_conntrack_tuple_mask *mask)
1965 {
1966 int ret;
1967 struct nf_conntrack_l3proto *l3proto;
1968 struct nf_conntrack_l4proto *l4proto;
1969 struct nf_conntrack_tuple m;
1970 struct nlattr *nest_parms;
1971
1972 memset(&m, 0xFF, sizeof(m));
1973 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1974 m.src.u.all = mask->src.u.all;
1975 m.dst.protonum = tuple->dst.protonum;
1976
1977 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1978 if (!nest_parms)
1979 goto nla_put_failure;
1980
1981 rcu_read_lock();
1982 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1983 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1984 if (ret >= 0) {
1985 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
1986 tuple->dst.protonum);
1987 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1988 }
1989 rcu_read_unlock();
1990
1991 if (unlikely(ret < 0))
1992 goto nla_put_failure;
1993
1994 nla_nest_end(skb, nest_parms);
1995
1996 return 0;
1997
1998 nla_put_failure:
1999 return -1;
2000 }
2001
2002 static const union nf_inet_addr any_addr;
2003
2004 static int
2005 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2006 const struct nf_conntrack_expect *exp)
2007 {
2008 struct nf_conn *master = exp->master;
2009 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2010 struct nf_conn_help *help;
2011 #ifdef CONFIG_NF_NAT_NEEDED
2012 struct nlattr *nest_parms;
2013 struct nf_conntrack_tuple nat_tuple = {};
2014 #endif
2015 struct nf_ct_helper_expectfn *expfn;
2016
2017 if (timeout < 0)
2018 timeout = 0;
2019
2020 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2021 goto nla_put_failure;
2022 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2023 goto nla_put_failure;
2024 if (ctnetlink_exp_dump_tuple(skb,
2025 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2026 CTA_EXPECT_MASTER) < 0)
2027 goto nla_put_failure;
2028
2029 #ifdef CONFIG_NF_NAT_NEEDED
2030 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2031 exp->saved_proto.all) {
2032 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2033 if (!nest_parms)
2034 goto nla_put_failure;
2035
2036 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2037 goto nla_put_failure;
2038
2039 nat_tuple.src.l3num = nf_ct_l3num(master);
2040 nat_tuple.src.u3 = exp->saved_addr;
2041 nat_tuple.dst.protonum = nf_ct_protonum(master);
2042 nat_tuple.src.u = exp->saved_proto;
2043
2044 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2045 CTA_EXPECT_NAT_TUPLE) < 0)
2046 goto nla_put_failure;
2047 nla_nest_end(skb, nest_parms);
2048 }
2049 #endif
2050 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2051 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2052 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2053 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2054 goto nla_put_failure;
2055 help = nfct_help(master);
2056 if (help) {
2057 struct nf_conntrack_helper *helper;
2058
2059 helper = rcu_dereference(help->helper);
2060 if (helper &&
2061 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2062 goto nla_put_failure;
2063 }
2064 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2065 if (expfn != NULL &&
2066 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2067 goto nla_put_failure;
2068
2069 return 0;
2070
2071 nla_put_failure:
2072 return -1;
2073 }
2074
2075 static int
2076 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2077 int event, const struct nf_conntrack_expect *exp)
2078 {
2079 struct nlmsghdr *nlh;
2080 struct nfgenmsg *nfmsg;
2081 unsigned int flags = portid ? NLM_F_MULTI : 0;
2082
2083 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2084 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2085 if (nlh == NULL)
2086 goto nlmsg_failure;
2087
2088 nfmsg = nlmsg_data(nlh);
2089 nfmsg->nfgen_family = exp->tuple.src.l3num;
2090 nfmsg->version = NFNETLINK_V0;
2091 nfmsg->res_id = 0;
2092
2093 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2094 goto nla_put_failure;
2095
2096 nlmsg_end(skb, nlh);
2097 return skb->len;
2098
2099 nlmsg_failure:
2100 nla_put_failure:
2101 nlmsg_cancel(skb, nlh);
2102 return -1;
2103 }
2104
2105 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2106 static int
2107 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2108 {
2109 struct nf_conntrack_expect *exp = item->exp;
2110 struct net *net = nf_ct_exp_net(exp);
2111 struct nlmsghdr *nlh;
2112 struct nfgenmsg *nfmsg;
2113 struct sk_buff *skb;
2114 unsigned int type, group;
2115 int flags = 0;
2116
2117 if (events & (1 << IPEXP_DESTROY)) {
2118 type = IPCTNL_MSG_EXP_DELETE;
2119 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2120 } else if (events & (1 << IPEXP_NEW)) {
2121 type = IPCTNL_MSG_EXP_NEW;
2122 flags = NLM_F_CREATE|NLM_F_EXCL;
2123 group = NFNLGRP_CONNTRACK_EXP_NEW;
2124 } else
2125 return 0;
2126
2127 if (!item->report && !nfnetlink_has_listeners(net, group))
2128 return 0;
2129
2130 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2131 if (skb == NULL)
2132 goto errout;
2133
2134 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2135 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2136 if (nlh == NULL)
2137 goto nlmsg_failure;
2138
2139 nfmsg = nlmsg_data(nlh);
2140 nfmsg->nfgen_family = exp->tuple.src.l3num;
2141 nfmsg->version = NFNETLINK_V0;
2142 nfmsg->res_id = 0;
2143
2144 rcu_read_lock();
2145 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2146 goto nla_put_failure;
2147 rcu_read_unlock();
2148
2149 nlmsg_end(skb, nlh);
2150 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2151 return 0;
2152
2153 nla_put_failure:
2154 rcu_read_unlock();
2155 nlmsg_cancel(skb, nlh);
2156 nlmsg_failure:
2157 kfree_skb(skb);
2158 errout:
2159 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2160 return 0;
2161 }
2162 #endif
2163 static int ctnetlink_exp_done(struct netlink_callback *cb)
2164 {
2165 if (cb->args[1])
2166 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2167 return 0;
2168 }
2169
2170 static int
2171 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2172 {
2173 struct net *net = sock_net(skb->sk);
2174 struct nf_conntrack_expect *exp, *last;
2175 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2176 struct hlist_node *n;
2177 u_int8_t l3proto = nfmsg->nfgen_family;
2178
2179 rcu_read_lock();
2180 last = (struct nf_conntrack_expect *)cb->args[1];
2181 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2182 restart:
2183 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
2184 hnode) {
2185 if (l3proto && exp->tuple.src.l3num != l3proto)
2186 continue;
2187 if (cb->args[1]) {
2188 if (exp != last)
2189 continue;
2190 cb->args[1] = 0;
2191 }
2192 if (ctnetlink_exp_fill_info(skb,
2193 NETLINK_CB(cb->skb).portid,
2194 cb->nlh->nlmsg_seq,
2195 IPCTNL_MSG_EXP_NEW,
2196 exp) < 0) {
2197 if (!atomic_inc_not_zero(&exp->use))
2198 continue;
2199 cb->args[1] = (unsigned long)exp;
2200 goto out;
2201 }
2202 }
2203 if (cb->args[1]) {
2204 cb->args[1] = 0;
2205 goto restart;
2206 }
2207 }
2208 out:
2209 rcu_read_unlock();
2210 if (last)
2211 nf_ct_expect_put(last);
2212
2213 return skb->len;
2214 }
2215
2216 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2217 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2218 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2219 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2220 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2221 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2222 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
2223 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2224 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2225 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2226 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2227 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2228 };
2229
2230 static int
2231 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2232 const struct nlmsghdr *nlh,
2233 const struct nlattr * const cda[])
2234 {
2235 struct net *net = sock_net(ctnl);
2236 struct nf_conntrack_tuple tuple;
2237 struct nf_conntrack_expect *exp;
2238 struct sk_buff *skb2;
2239 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2240 u_int8_t u3 = nfmsg->nfgen_family;
2241 u16 zone;
2242 int err;
2243
2244 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2245 struct netlink_dump_control c = {
2246 .dump = ctnetlink_exp_dump_table,
2247 .done = ctnetlink_exp_done,
2248 };
2249 return netlink_dump_start(ctnl, skb, nlh, &c);
2250 }
2251
2252 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2253 if (err < 0)
2254 return err;
2255
2256 if (cda[CTA_EXPECT_TUPLE])
2257 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2258 else if (cda[CTA_EXPECT_MASTER])
2259 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2260 else
2261 return -EINVAL;
2262
2263 if (err < 0)
2264 return err;
2265
2266 exp = nf_ct_expect_find_get(net, zone, &tuple);
2267 if (!exp)
2268 return -ENOENT;
2269
2270 if (cda[CTA_EXPECT_ID]) {
2271 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2272 if (ntohl(id) != (u32)(unsigned long)exp) {
2273 nf_ct_expect_put(exp);
2274 return -ENOENT;
2275 }
2276 }
2277
2278 err = -ENOMEM;
2279 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2280 if (skb2 == NULL) {
2281 nf_ct_expect_put(exp);
2282 goto out;
2283 }
2284
2285 rcu_read_lock();
2286 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2287 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2288 rcu_read_unlock();
2289 nf_ct_expect_put(exp);
2290 if (err <= 0)
2291 goto free;
2292
2293 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2294 if (err < 0)
2295 goto out;
2296
2297 return 0;
2298
2299 free:
2300 kfree_skb(skb2);
2301 out:
2302 /* this avoids a loop in nfnetlink. */
2303 return err == -EAGAIN ? -ENOBUFS : err;
2304 }
2305
2306 static int
2307 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2308 const struct nlmsghdr *nlh,
2309 const struct nlattr * const cda[])
2310 {
2311 struct net *net = sock_net(ctnl);
2312 struct nf_conntrack_expect *exp;
2313 struct nf_conntrack_tuple tuple;
2314 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2315 struct hlist_node *n, *next;
2316 u_int8_t u3 = nfmsg->nfgen_family;
2317 unsigned int i;
2318 u16 zone;
2319 int err;
2320
2321 if (cda[CTA_EXPECT_TUPLE]) {
2322 /* delete a single expect by tuple */
2323 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2324 if (err < 0)
2325 return err;
2326
2327 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2328 if (err < 0)
2329 return err;
2330
2331 /* bump usage count to 2 */
2332 exp = nf_ct_expect_find_get(net, zone, &tuple);
2333 if (!exp)
2334 return -ENOENT;
2335
2336 if (cda[CTA_EXPECT_ID]) {
2337 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2338 if (ntohl(id) != (u32)(unsigned long)exp) {
2339 nf_ct_expect_put(exp);
2340 return -ENOENT;
2341 }
2342 }
2343
2344 /* after list removal, usage count == 1 */
2345 spin_lock_bh(&nf_conntrack_lock);
2346 if (del_timer(&exp->timeout)) {
2347 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2348 nlmsg_report(nlh));
2349 nf_ct_expect_put(exp);
2350 }
2351 spin_unlock_bh(&nf_conntrack_lock);
2352 /* have to put what we 'get' above.
2353 * after this line usage count == 0 */
2354 nf_ct_expect_put(exp);
2355 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2356 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2357 struct nf_conn_help *m_help;
2358
2359 /* delete all expectations for this helper */
2360 spin_lock_bh(&nf_conntrack_lock);
2361 for (i = 0; i < nf_ct_expect_hsize; i++) {
2362 hlist_for_each_entry_safe(exp, n, next,
2363 &net->ct.expect_hash[i],
2364 hnode) {
2365 m_help = nfct_help(exp->master);
2366 if (!strcmp(m_help->helper->name, name) &&
2367 del_timer(&exp->timeout)) {
2368 nf_ct_unlink_expect_report(exp,
2369 NETLINK_CB(skb).portid,
2370 nlmsg_report(nlh));
2371 nf_ct_expect_put(exp);
2372 }
2373 }
2374 }
2375 spin_unlock_bh(&nf_conntrack_lock);
2376 } else {
2377 /* This basically means we have to flush everything*/
2378 spin_lock_bh(&nf_conntrack_lock);
2379 for (i = 0; i < nf_ct_expect_hsize; i++) {
2380 hlist_for_each_entry_safe(exp, n, next,
2381 &net->ct.expect_hash[i],
2382 hnode) {
2383 if (del_timer(&exp->timeout)) {
2384 nf_ct_unlink_expect_report(exp,
2385 NETLINK_CB(skb).portid,
2386 nlmsg_report(nlh));
2387 nf_ct_expect_put(exp);
2388 }
2389 }
2390 }
2391 spin_unlock_bh(&nf_conntrack_lock);
2392 }
2393
2394 return 0;
2395 }
2396 static int
2397 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2398 const struct nlattr * const cda[])
2399 {
2400 if (cda[CTA_EXPECT_TIMEOUT]) {
2401 if (!del_timer(&x->timeout))
2402 return -ETIME;
2403
2404 x->timeout.expires = jiffies +
2405 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2406 add_timer(&x->timeout);
2407 }
2408 return 0;
2409 }
2410
2411 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2412 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2413 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2414 };
2415
2416 static int
2417 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2418 struct nf_conntrack_expect *exp,
2419 u_int8_t u3)
2420 {
2421 #ifdef CONFIG_NF_NAT_NEEDED
2422 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2423 struct nf_conntrack_tuple nat_tuple = {};
2424 int err;
2425
2426 nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2427
2428 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2429 return -EINVAL;
2430
2431 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2432 &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2433 if (err < 0)
2434 return err;
2435
2436 exp->saved_addr = nat_tuple.src.u3;
2437 exp->saved_proto = nat_tuple.src.u;
2438 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2439
2440 return 0;
2441 #else
2442 return -EOPNOTSUPP;
2443 #endif
2444 }
2445
2446 static int
2447 ctnetlink_create_expect(struct net *net, u16 zone,
2448 const struct nlattr * const cda[],
2449 u_int8_t u3,
2450 u32 portid, int report)
2451 {
2452 struct nf_conntrack_tuple tuple, mask, master_tuple;
2453 struct nf_conntrack_tuple_hash *h = NULL;
2454 struct nf_conntrack_expect *exp;
2455 struct nf_conn *ct;
2456 struct nf_conn_help *help;
2457 struct nf_conntrack_helper *helper = NULL;
2458 u_int32_t class = 0;
2459 int err = 0;
2460
2461 /* caller guarantees that those three CTA_EXPECT_* exist */
2462 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2463 if (err < 0)
2464 return err;
2465 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2466 if (err < 0)
2467 return err;
2468 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2469 if (err < 0)
2470 return err;
2471
2472 /* Look for master conntrack of this expectation */
2473 h = nf_conntrack_find_get(net, zone, &master_tuple);
2474 if (!h)
2475 return -ENOENT;
2476 ct = nf_ct_tuplehash_to_ctrack(h);
2477
2478 /* Look for helper of this expectation */
2479 if (cda[CTA_EXPECT_HELP_NAME]) {
2480 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2481
2482 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2483 nf_ct_protonum(ct));
2484 if (helper == NULL) {
2485 #ifdef CONFIG_MODULES
2486 if (request_module("nfct-helper-%s", helpname) < 0) {
2487 err = -EOPNOTSUPP;
2488 goto out;
2489 }
2490
2491 helper = __nf_conntrack_helper_find(helpname,
2492 nf_ct_l3num(ct),
2493 nf_ct_protonum(ct));
2494 if (helper) {
2495 err = -EAGAIN;
2496 goto out;
2497 }
2498 #endif
2499 err = -EOPNOTSUPP;
2500 goto out;
2501 }
2502 }
2503
2504 if (cda[CTA_EXPECT_CLASS] && helper) {
2505 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2506 if (class > helper->expect_class_max) {
2507 err = -EINVAL;
2508 goto out;
2509 }
2510 }
2511 exp = nf_ct_expect_alloc(ct);
2512 if (!exp) {
2513 err = -ENOMEM;
2514 goto out;
2515 }
2516 help = nfct_help(ct);
2517 if (!help) {
2518 if (!cda[CTA_EXPECT_TIMEOUT]) {
2519 err = -EINVAL;
2520 goto out;
2521 }
2522 exp->timeout.expires =
2523 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2524
2525 exp->flags = NF_CT_EXPECT_USERSPACE;
2526 if (cda[CTA_EXPECT_FLAGS]) {
2527 exp->flags |=
2528 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2529 }
2530 } else {
2531 if (cda[CTA_EXPECT_FLAGS]) {
2532 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2533 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2534 } else
2535 exp->flags = 0;
2536 }
2537 if (cda[CTA_EXPECT_FN]) {
2538 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2539 struct nf_ct_helper_expectfn *expfn;
2540
2541 expfn = nf_ct_helper_expectfn_find_by_name(name);
2542 if (expfn == NULL) {
2543 err = -EINVAL;
2544 goto err_out;
2545 }
2546 exp->expectfn = expfn->expectfn;
2547 } else
2548 exp->expectfn = NULL;
2549
2550 exp->class = class;
2551 exp->master = ct;
2552 exp->helper = helper;
2553 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2554 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2555 exp->mask.src.u.all = mask.src.u.all;
2556
2557 if (cda[CTA_EXPECT_NAT]) {
2558 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2559 exp, u3);
2560 if (err < 0)
2561 goto err_out;
2562 }
2563 err = nf_ct_expect_related_report(exp, portid, report);
2564 err_out:
2565 nf_ct_expect_put(exp);
2566 out:
2567 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2568 return err;
2569 }
2570
2571 static int
2572 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2573 const struct nlmsghdr *nlh,
2574 const struct nlattr * const cda[])
2575 {
2576 struct net *net = sock_net(ctnl);
2577 struct nf_conntrack_tuple tuple;
2578 struct nf_conntrack_expect *exp;
2579 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2580 u_int8_t u3 = nfmsg->nfgen_family;
2581 u16 zone;
2582 int err;
2583
2584 if (!cda[CTA_EXPECT_TUPLE]
2585 || !cda[CTA_EXPECT_MASK]
2586 || !cda[CTA_EXPECT_MASTER])
2587 return -EINVAL;
2588
2589 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2590 if (err < 0)
2591 return err;
2592
2593 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2594 if (err < 0)
2595 return err;
2596
2597 spin_lock_bh(&nf_conntrack_lock);
2598 exp = __nf_ct_expect_find(net, zone, &tuple);
2599
2600 if (!exp) {
2601 spin_unlock_bh(&nf_conntrack_lock);
2602 err = -ENOENT;
2603 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2604 err = ctnetlink_create_expect(net, zone, cda,
2605 u3,
2606 NETLINK_CB(skb).portid,
2607 nlmsg_report(nlh));
2608 }
2609 return err;
2610 }
2611
2612 err = -EEXIST;
2613 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2614 err = ctnetlink_change_expect(exp, cda);
2615 spin_unlock_bh(&nf_conntrack_lock);
2616
2617 return err;
2618 }
2619
2620 static int
2621 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
2622 const struct ip_conntrack_stat *st)
2623 {
2624 struct nlmsghdr *nlh;
2625 struct nfgenmsg *nfmsg;
2626 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2627
2628 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
2629 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2630 if (nlh == NULL)
2631 goto nlmsg_failure;
2632
2633 nfmsg = nlmsg_data(nlh);
2634 nfmsg->nfgen_family = AF_UNSPEC;
2635 nfmsg->version = NFNETLINK_V0;
2636 nfmsg->res_id = htons(cpu);
2637
2638 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
2639 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
2640 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
2641 goto nla_put_failure;
2642
2643 nlmsg_end(skb, nlh);
2644 return skb->len;
2645
2646 nla_put_failure:
2647 nlmsg_failure:
2648 nlmsg_cancel(skb, nlh);
2649 return -1;
2650 }
2651
2652 static int
2653 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2654 {
2655 int cpu;
2656 struct net *net = sock_net(skb->sk);
2657
2658 if (cb->args[0] == nr_cpu_ids)
2659 return 0;
2660
2661 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2662 const struct ip_conntrack_stat *st;
2663
2664 if (!cpu_possible(cpu))
2665 continue;
2666
2667 st = per_cpu_ptr(net->ct.stat, cpu);
2668 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
2669 cb->nlh->nlmsg_seq,
2670 cpu, st) < 0)
2671 break;
2672 }
2673 cb->args[0] = cpu;
2674
2675 return skb->len;
2676 }
2677
2678 static int
2679 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
2680 const struct nlmsghdr *nlh,
2681 const struct nlattr * const cda[])
2682 {
2683 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2684 struct netlink_dump_control c = {
2685 .dump = ctnetlink_exp_stat_cpu_dump,
2686 };
2687 return netlink_dump_start(ctnl, skb, nlh, &c);
2688 }
2689
2690 return 0;
2691 }
2692
2693 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2694 static struct nf_ct_event_notifier ctnl_notifier = {
2695 .fcn = ctnetlink_conntrack_event,
2696 };
2697
2698 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2699 .fcn = ctnetlink_expect_event,
2700 };
2701 #endif
2702
2703 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2704 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2705 .attr_count = CTA_MAX,
2706 .policy = ct_nla_policy },
2707 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2708 .attr_count = CTA_MAX,
2709 .policy = ct_nla_policy },
2710 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2711 .attr_count = CTA_MAX,
2712 .policy = ct_nla_policy },
2713 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2714 .attr_count = CTA_MAX,
2715 .policy = ct_nla_policy },
2716 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
2717 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
2718 };
2719
2720 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2721 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2722 .attr_count = CTA_EXPECT_MAX,
2723 .policy = exp_nla_policy },
2724 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2725 .attr_count = CTA_EXPECT_MAX,
2726 .policy = exp_nla_policy },
2727 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2728 .attr_count = CTA_EXPECT_MAX,
2729 .policy = exp_nla_policy },
2730 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
2731 };
2732
2733 static const struct nfnetlink_subsystem ctnl_subsys = {
2734 .name = "conntrack",
2735 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2736 .cb_count = IPCTNL_MSG_MAX,
2737 .cb = ctnl_cb,
2738 };
2739
2740 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2741 .name = "conntrack_expect",
2742 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2743 .cb_count = IPCTNL_MSG_EXP_MAX,
2744 .cb = ctnl_exp_cb,
2745 };
2746
2747 MODULE_ALIAS("ip_conntrack_netlink");
2748 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2749 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2750
2751 static int __net_init ctnetlink_net_init(struct net *net)
2752 {
2753 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2754 int ret;
2755
2756 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
2757 if (ret < 0) {
2758 pr_err("ctnetlink_init: cannot register notifier.\n");
2759 goto err_out;
2760 }
2761
2762 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
2763 if (ret < 0) {
2764 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2765 goto err_unreg_notifier;
2766 }
2767 #endif
2768 return 0;
2769
2770 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2771 err_unreg_notifier:
2772 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2773 err_out:
2774 return ret;
2775 #endif
2776 }
2777
2778 static void ctnetlink_net_exit(struct net *net)
2779 {
2780 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2781 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
2782 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2783 #endif
2784 }
2785
2786 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
2787 {
2788 struct net *net;
2789
2790 list_for_each_entry(net, net_exit_list, exit_list)
2791 ctnetlink_net_exit(net);
2792 }
2793
2794 static struct pernet_operations ctnetlink_net_ops = {
2795 .init = ctnetlink_net_init,
2796 .exit_batch = ctnetlink_net_exit_batch,
2797 };
2798
2799 static int __init ctnetlink_init(void)
2800 {
2801 int ret;
2802
2803 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2804 ret = nfnetlink_subsys_register(&ctnl_subsys);
2805 if (ret < 0) {
2806 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2807 goto err_out;
2808 }
2809
2810 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2811 if (ret < 0) {
2812 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2813 goto err_unreg_subsys;
2814 }
2815
2816 ret = register_pernet_subsys(&ctnetlink_net_ops);
2817 if (ret < 0) {
2818 pr_err("ctnetlink_init: cannot register pernet operations\n");
2819 goto err_unreg_exp_subsys;
2820 }
2821 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
2822 /* setup interaction between nf_queue and nf_conntrack_netlink. */
2823 RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
2824 #endif
2825 return 0;
2826
2827 err_unreg_exp_subsys:
2828 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2829 err_unreg_subsys:
2830 nfnetlink_subsys_unregister(&ctnl_subsys);
2831 err_out:
2832 return ret;
2833 }
2834
2835 static void __exit ctnetlink_exit(void)
2836 {
2837 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2838
2839 unregister_pernet_subsys(&ctnetlink_net_ops);
2840 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2841 nfnetlink_subsys_unregister(&ctnl_subsys);
2842 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
2843 RCU_INIT_POINTER(nfq_ct_hook, NULL);
2844 #endif
2845 }
2846
2847 module_init(ctnetlink_init);
2848 module_exit(ctnetlink_exit);
kernel source for telekom puls (alcatel/mediatek)