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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / netfilter / nf_conntrack_netlink.c
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CommitLineData
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) 2005-2011 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_protocol.h>
49#endif
50
51#include <linux/netfilter/nfnetlink.h>
52#include <linux/netfilter/nfnetlink_conntrack.h>
53
54MODULE_LICENSE("GPL");
55
56static char __initdata version[] = "0.93";
57
58static inline int
59ctnetlink_dump_tuples_proto(struct sk_buff *skb,
60 const struct nf_conntrack_tuple *tuple,
61 struct nf_conntrack_l4proto *l4proto)
62{
63 int ret = 0;
64 struct nlattr *nest_parms;
65
66 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
67 if (!nest_parms)
68 goto nla_put_failure;
69 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
70
71 if (likely(l4proto->tuple_to_nlattr))
72 ret = l4proto->tuple_to_nlattr(skb, tuple);
73
74 nla_nest_end(skb, nest_parms);
75
76 return ret;
77
78nla_put_failure:
79 return -1;
80}
81
82static inline int
83ctnetlink_dump_tuples_ip(struct sk_buff *skb,
84 const struct nf_conntrack_tuple *tuple,
85 struct nf_conntrack_l3proto *l3proto)
86{
87 int ret = 0;
88 struct nlattr *nest_parms;
89
90 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
91 if (!nest_parms)
92 goto nla_put_failure;
93
94 if (likely(l3proto->tuple_to_nlattr))
95 ret = l3proto->tuple_to_nlattr(skb, tuple);
96
97 nla_nest_end(skb, nest_parms);
98
99 return ret;
100
101nla_put_failure:
102 return -1;
103}
104
105static int
106ctnetlink_dump_tuples(struct sk_buff *skb,
107 const struct nf_conntrack_tuple *tuple)
108{
109 int ret;
110 struct nf_conntrack_l3proto *l3proto;
111 struct nf_conntrack_l4proto *l4proto;
112
113 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
114 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
115
116 if (unlikely(ret < 0))
117 return ret;
118
119 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
120 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
121
122 return ret;
123}
124
125static inline int
126ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
127{
128 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
129 return 0;
130
131nla_put_failure:
132 return -1;
133}
134
135static inline int
136ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
137{
138 long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
139
140 if (timeout < 0)
141 timeout = 0;
142
143 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
144 return 0;
145
146nla_put_failure:
147 return -1;
148}
149
150static inline int
151ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
152{
153 struct nf_conntrack_l4proto *l4proto;
154 struct nlattr *nest_proto;
155 int ret;
156
157 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
158 if (!l4proto->to_nlattr)
159 return 0;
160
161 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
162 if (!nest_proto)
163 goto nla_put_failure;
164
165 ret = l4proto->to_nlattr(skb, nest_proto, ct);
166
167 nla_nest_end(skb, nest_proto);
168
169 return ret;
170
171nla_put_failure:
172 return -1;
173}
174
175static inline int
176ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
177{
178 struct nlattr *nest_helper;
179 const struct nf_conn_help *help = nfct_help(ct);
180 struct nf_conntrack_helper *helper;
181
182 if (!help)
183 return 0;
184
185 helper = rcu_dereference(help->helper);
186 if (!helper)
187 goto out;
188
189 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
190 if (!nest_helper)
191 goto nla_put_failure;
192 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
193
194 if (helper->to_nlattr)
195 helper->to_nlattr(skb, ct);
196
197 nla_nest_end(skb, nest_helper);
198out:
199 return 0;
200
201nla_put_failure:
202 return -1;
203}
204
205static int
206dump_counters(struct sk_buff *skb, u64 pkts, u64 bytes,
207 enum ip_conntrack_dir dir)
208{
209 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
210 struct nlattr *nest_count;
211
212 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
213 if (!nest_count)
214 goto nla_put_failure;
215
216 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts));
217 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes));
218
219 nla_nest_end(skb, nest_count);
220
221 return 0;
222
223nla_put_failure:
224 return -1;
225}
226
227static int
228ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
229 enum ip_conntrack_dir dir, int type)
230{
231 struct nf_conn_counter *acct;
232 u64 pkts, bytes;
233
234 acct = nf_conn_acct_find(ct);
235 if (!acct)
236 return 0;
237
238 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
239 pkts = atomic64_xchg(&acct[dir].packets, 0);
240 bytes = atomic64_xchg(&acct[dir].bytes, 0);
241 } else {
242 pkts = atomic64_read(&acct[dir].packets);
243 bytes = atomic64_read(&acct[dir].bytes);
244 }
245 return dump_counters(skb, pkts, bytes, dir);
246}
247
248static int
249ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
250{
251 struct nlattr *nest_count;
252 const struct nf_conn_tstamp *tstamp;
253
254 tstamp = nf_conn_tstamp_find(ct);
255 if (!tstamp)
256 return 0;
257
258 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
259 if (!nest_count)
260 goto nla_put_failure;
261
262 NLA_PUT_BE64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start));
263 if (tstamp->stop != 0) {
264 NLA_PUT_BE64(skb, CTA_TIMESTAMP_STOP,
265 cpu_to_be64(tstamp->stop));
266 }
267 nla_nest_end(skb, nest_count);
268
269 return 0;
270
271nla_put_failure:
272 return -1;
273}
274
275#ifdef CONFIG_NF_CONNTRACK_MARK
276static inline int
277ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
278{
279 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
280 return 0;
281
282nla_put_failure:
283 return -1;
284}
285#else
286#define ctnetlink_dump_mark(a, b) (0)
287#endif
288
289#ifdef CONFIG_NF_CONNTRACK_SECMARK
290static inline int
291ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
292{
293 struct nlattr *nest_secctx;
294 int len, ret;
295 char *secctx;
296
297 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
298 if (ret)
299 return 0;
300
301 ret = -1;
302 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
303 if (!nest_secctx)
304 goto nla_put_failure;
305
306 NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
307 nla_nest_end(skb, nest_secctx);
308
309 ret = 0;
310nla_put_failure:
311 security_release_secctx(secctx, len);
312 return ret;
313}
314#else
315#define ctnetlink_dump_secctx(a, b) (0)
316#endif
317
318#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
319
320static inline int
321ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
322{
323 struct nlattr *nest_parms;
324
325 if (!(ct->status & IPS_EXPECTED))
326 return 0;
327
328 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
329 if (!nest_parms)
330 goto nla_put_failure;
331 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
332 goto nla_put_failure;
333 nla_nest_end(skb, nest_parms);
334
335 return 0;
336
337nla_put_failure:
338 return -1;
339}
340
341#ifdef CONFIG_NF_NAT_NEEDED
342static int
343dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
344{
345 struct nlattr *nest_parms;
346
347 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
348 if (!nest_parms)
349 goto nla_put_failure;
350
351 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
352 htonl(natseq->correction_pos));
353 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
354 htonl(natseq->offset_before));
355 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
356 htonl(natseq->offset_after));
357
358 nla_nest_end(skb, nest_parms);
359
360 return 0;
361
362nla_put_failure:
363 return -1;
364}
365
366static inline int
367ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
368{
369 struct nf_nat_seq *natseq;
370 struct nf_conn_nat *nat = nfct_nat(ct);
371
372 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
373 return 0;
374
375 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
376 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
377 return -1;
378
379 natseq = &nat->seq[IP_CT_DIR_REPLY];
380 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
381 return -1;
382
383 return 0;
384}
385#else
386#define ctnetlink_dump_nat_seq_adj(a, b) (0)
387#endif
388
389static inline int
390ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
391{
392 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
393 return 0;
394
395nla_put_failure:
396 return -1;
397}
398
399static inline int
400ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
401{
402 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
403 return 0;
404
405nla_put_failure:
406 return -1;
407}
408
409static int
410ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, u32 type,
411 struct nf_conn *ct)
412{
413 struct nlmsghdr *nlh;
414 struct nfgenmsg *nfmsg;
415 struct nlattr *nest_parms;
416 unsigned int flags = pid ? NLM_F_MULTI : 0, event;
417
418 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
419 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
420 if (nlh == NULL)
421 goto nlmsg_failure;
422
423 nfmsg = nlmsg_data(nlh);
424 nfmsg->nfgen_family = nf_ct_l3num(ct);
425 nfmsg->version = NFNETLINK_V0;
426 nfmsg->res_id = 0;
427
428 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
429 if (!nest_parms)
430 goto nla_put_failure;
431 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
432 goto nla_put_failure;
433 nla_nest_end(skb, nest_parms);
434
435 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
436 if (!nest_parms)
437 goto nla_put_failure;
438 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
439 goto nla_put_failure;
440 nla_nest_end(skb, nest_parms);
441
442 if (nf_ct_zone(ct))
443 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
444
445 if (ctnetlink_dump_status(skb, ct) < 0 ||
446 ctnetlink_dump_timeout(skb, ct) < 0 ||
447 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL, type) < 0 ||
448 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY, type) < 0 ||
449 ctnetlink_dump_timestamp(skb, ct) < 0 ||
450 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
451 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
452 ctnetlink_dump_mark(skb, ct) < 0 ||
453 ctnetlink_dump_secctx(skb, ct) < 0 ||
454 ctnetlink_dump_id(skb, ct) < 0 ||
455 ctnetlink_dump_use(skb, ct) < 0 ||
456 ctnetlink_dump_master(skb, ct) < 0 ||
457 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
458 goto nla_put_failure;
459
460 nlmsg_end(skb, nlh);
461 return skb->len;
462
463nlmsg_failure:
464nla_put_failure:
465 nlmsg_cancel(skb, nlh);
466 return -1;
467}
468
469#ifdef CONFIG_NF_CONNTRACK_EVENTS
470static inline size_t
471ctnetlink_proto_size(const struct nf_conn *ct)
472{
473 struct nf_conntrack_l3proto *l3proto;
474 struct nf_conntrack_l4proto *l4proto;
475 size_t len = 0;
476
477 rcu_read_lock();
478 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
479 len += l3proto->nla_size;
480
481 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
482 len += l4proto->nla_size;
483 rcu_read_unlock();
484
485 return len;
486}
487
488static inline size_t
489ctnetlink_counters_size(const struct nf_conn *ct)
490{
491 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
492 return 0;
493 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
494 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
495 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
496 ;
497}
498
499static inline int
500ctnetlink_secctx_size(const struct nf_conn *ct)
501{
502#ifdef CONFIG_NF_CONNTRACK_SECMARK
503 int len, ret;
504
505 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
506 if (ret)
507 return 0;
508
509 return nla_total_size(0) /* CTA_SECCTX */
510 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
511#else
512 return 0;
513#endif
514}
515
516static inline size_t
517ctnetlink_timestamp_size(const struct nf_conn *ct)
518{
519#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
520 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
521 return 0;
522 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
523#else
524 return 0;
525#endif
526}
527
528static inline size_t
529ctnetlink_nlmsg_size(const struct nf_conn *ct)
530{
531 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
532 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
533 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
534 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
535 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
536 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
537 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
538 + ctnetlink_counters_size(ct)
539 + ctnetlink_timestamp_size(ct)
540 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
541 + nla_total_size(0) /* CTA_PROTOINFO */
542 + nla_total_size(0) /* CTA_HELP */
543 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
544 + ctnetlink_secctx_size(ct)
545#ifdef CONFIG_NF_NAT_NEEDED
546 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
547 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
548#endif
549#ifdef CONFIG_NF_CONNTRACK_MARK
550 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
551#endif
552 + ctnetlink_proto_size(ct)
553 ;
554}
555
556static int
557ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
558{
559 struct net *net;
560 struct nlmsghdr *nlh;
561 struct nfgenmsg *nfmsg;
562 struct nlattr *nest_parms;
563 struct nf_conn *ct = item->ct;
564 struct sk_buff *skb;
565 unsigned int type;
566 unsigned int flags = 0, group;
567 int err;
568
569 /* ignore our fake conntrack entry */
570 if (nf_ct_is_untracked(ct))
571 return 0;
572
573 if (events & (1 << IPCT_DESTROY)) {
574 type = IPCTNL_MSG_CT_DELETE;
575 group = NFNLGRP_CONNTRACK_DESTROY;
576 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
577 type = IPCTNL_MSG_CT_NEW;
578 flags = NLM_F_CREATE|NLM_F_EXCL;
579 group = NFNLGRP_CONNTRACK_NEW;
580 } else if (events) {
581 type = IPCTNL_MSG_CT_NEW;
582 group = NFNLGRP_CONNTRACK_UPDATE;
583 } else
584 return 0;
585
586 net = nf_ct_net(ct);
587 if (!item->report && !nfnetlink_has_listeners(net, group))
588 return 0;
589
590 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
591 if (skb == NULL)
592 goto errout;
593
594 type |= NFNL_SUBSYS_CTNETLINK << 8;
595 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
596 if (nlh == NULL)
597 goto nlmsg_failure;
598
599 nfmsg = nlmsg_data(nlh);
600 nfmsg->nfgen_family = nf_ct_l3num(ct);
601 nfmsg->version = NFNETLINK_V0;
602 nfmsg->res_id = 0;
603
604 rcu_read_lock();
605 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
606 if (!nest_parms)
607 goto nla_put_failure;
608 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
609 goto nla_put_failure;
610 nla_nest_end(skb, nest_parms);
611
612 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
613 if (!nest_parms)
614 goto nla_put_failure;
615 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
616 goto nla_put_failure;
617 nla_nest_end(skb, nest_parms);
618
619 if (nf_ct_zone(ct))
620 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
621
622 if (ctnetlink_dump_id(skb, ct) < 0)
623 goto nla_put_failure;
624
625 if (ctnetlink_dump_status(skb, ct) < 0)
626 goto nla_put_failure;
627
628 if (events & (1 << IPCT_DESTROY)) {
629 if (ctnetlink_dump_counters(skb, ct,
630 IP_CT_DIR_ORIGINAL, type) < 0 ||
631 ctnetlink_dump_counters(skb, ct,
632 IP_CT_DIR_REPLY, type) < 0 ||
633 ctnetlink_dump_timestamp(skb, ct) < 0)
634 goto nla_put_failure;
635 } else {
636 if (ctnetlink_dump_timeout(skb, ct) < 0)
637 goto nla_put_failure;
638
639 if (events & (1 << IPCT_PROTOINFO)
640 && ctnetlink_dump_protoinfo(skb, ct) < 0)
641 goto nla_put_failure;
642
643 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
644 && ctnetlink_dump_helpinfo(skb, ct) < 0)
645 goto nla_put_failure;
646
647#ifdef CONFIG_NF_CONNTRACK_SECMARK
648 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
649 && ctnetlink_dump_secctx(skb, ct) < 0)
650 goto nla_put_failure;
651#endif
652
653 if (events & (1 << IPCT_RELATED) &&
654 ctnetlink_dump_master(skb, ct) < 0)
655 goto nla_put_failure;
656
657 if (events & (1 << IPCT_NATSEQADJ) &&
658 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
659 goto nla_put_failure;
660 }
661
662#ifdef CONFIG_NF_CONNTRACK_MARK
663 if ((events & (1 << IPCT_MARK) || ct->mark)
664 && ctnetlink_dump_mark(skb, ct) < 0)
665 goto nla_put_failure;
666#endif
667 rcu_read_unlock();
668
669 nlmsg_end(skb, nlh);
670 err = nfnetlink_send(skb, net, item->pid, group, item->report,
671 GFP_ATOMIC);
672 if (err == -ENOBUFS || err == -EAGAIN)
673 return -ENOBUFS;
674
675 return 0;
676
677nla_put_failure:
678 rcu_read_unlock();
679 nlmsg_cancel(skb, nlh);
680nlmsg_failure:
681 kfree_skb(skb);
682errout:
683 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
684 return -ENOBUFS;
685
686 return 0;
687}
688#endif /* CONFIG_NF_CONNTRACK_EVENTS */
689
690static int ctnetlink_done(struct netlink_callback *cb)
691{
692 if (cb->args[1])
693 nf_ct_put((struct nf_conn *)cb->args[1]);
694 return 0;
695}
696
697static int
698ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
699{
700 struct net *net = sock_net(skb->sk);
701 struct nf_conn *ct, *last;
702 struct nf_conntrack_tuple_hash *h;
703 struct hlist_nulls_node *n;
704 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
705 u_int8_t l3proto = nfmsg->nfgen_family;
706
707 spin_lock_bh(&nf_conntrack_lock);
708 last = (struct nf_conn *)cb->args[1];
709 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
710restart:
711 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
712 hnnode) {
713 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
714 continue;
715 ct = nf_ct_tuplehash_to_ctrack(h);
716 /* Dump entries of a given L3 protocol number.
717 * If it is not specified, ie. l3proto == 0,
718 * then dump everything. */
719 if (l3proto && nf_ct_l3num(ct) != l3proto)
720 continue;
721 if (cb->args[1]) {
722 if (ct != last)
723 continue;
724 cb->args[1] = 0;
725 }
726 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
727 cb->nlh->nlmsg_seq,
728 NFNL_MSG_TYPE(
729 cb->nlh->nlmsg_type),
730 ct) < 0) {
731 nf_conntrack_get(&ct->ct_general);
732 cb->args[1] = (unsigned long)ct;
733 goto out;
734 }
735 }
736 if (cb->args[1]) {
737 cb->args[1] = 0;
738 goto restart;
739 }
740 }
741out:
742 spin_unlock_bh(&nf_conntrack_lock);
743 if (last)
744 nf_ct_put(last);
745
746 return skb->len;
747}
748
749static inline int
750ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
751{
752 struct nlattr *tb[CTA_IP_MAX+1];
753 struct nf_conntrack_l3proto *l3proto;
754 int ret = 0;
755
756 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
757
758 rcu_read_lock();
759 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
760
761 if (likely(l3proto->nlattr_to_tuple)) {
762 ret = nla_validate_nested(attr, CTA_IP_MAX,
763 l3proto->nla_policy);
764 if (ret == 0)
765 ret = l3proto->nlattr_to_tuple(tb, tuple);
766 }
767
768 rcu_read_unlock();
769
770 return ret;
771}
772
773static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
774 [CTA_PROTO_NUM] = { .type = NLA_U8 },
775};
776
777static inline int
778ctnetlink_parse_tuple_proto(struct nlattr *attr,
779 struct nf_conntrack_tuple *tuple)
780{
781 struct nlattr *tb[CTA_PROTO_MAX+1];
782 struct nf_conntrack_l4proto *l4proto;
783 int ret = 0;
784
785 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
786 if (ret < 0)
787 return ret;
788
789 if (!tb[CTA_PROTO_NUM])
790 return -EINVAL;
791 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
792
793 rcu_read_lock();
794 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
795
796 if (likely(l4proto->nlattr_to_tuple)) {
797 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
798 l4proto->nla_policy);
799 if (ret == 0)
800 ret = l4proto->nlattr_to_tuple(tb, tuple);
801 }
802
803 rcu_read_unlock();
804
805 return ret;
806}
807
808static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
809 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
810 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
811};
812
813static int
814ctnetlink_parse_tuple(const struct nlattr * const cda[],
815 struct nf_conntrack_tuple *tuple,
816 enum ctattr_type type, u_int8_t l3num)
817{
818 struct nlattr *tb[CTA_TUPLE_MAX+1];
819 int err;
820
821 memset(tuple, 0, sizeof(*tuple));
822
823 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
824
825 if (!tb[CTA_TUPLE_IP])
826 return -EINVAL;
827
828 tuple->src.l3num = l3num;
829
830 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
831 if (err < 0)
832 return err;
833
834 if (!tb[CTA_TUPLE_PROTO])
835 return -EINVAL;
836
837 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
838 if (err < 0)
839 return err;
840
841 /* orig and expect tuples get DIR_ORIGINAL */
842 if (type == CTA_TUPLE_REPLY)
843 tuple->dst.dir = IP_CT_DIR_REPLY;
844 else
845 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
846
847 return 0;
848}
849
850static int
851ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
852{
853 if (attr)
854#ifdef CONFIG_NF_CONNTRACK_ZONES
855 *zone = ntohs(nla_get_be16(attr));
856#else
857 return -EOPNOTSUPP;
858#endif
859 else
860 *zone = 0;
861
862 return 0;
863}
864
865static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
866 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
867};
868
869static inline int
870ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
871{
872 struct nlattr *tb[CTA_HELP_MAX+1];
873
874 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
875
876 if (!tb[CTA_HELP_NAME])
877 return -EINVAL;
878
879 *helper_name = nla_data(tb[CTA_HELP_NAME]);
880
881 return 0;
882}
883
884static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
885 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
886 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
887 [CTA_STATUS] = { .type = NLA_U32 },
888 [CTA_PROTOINFO] = { .type = NLA_NESTED },
889 [CTA_HELP] = { .type = NLA_NESTED },
890 [CTA_NAT_SRC] = { .type = NLA_NESTED },
891 [CTA_TIMEOUT] = { .type = NLA_U32 },
892 [CTA_MARK] = { .type = NLA_U32 },
893 [CTA_ID] = { .type = NLA_U32 },
894 [CTA_NAT_DST] = { .type = NLA_NESTED },
895 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
896 [CTA_ZONE] = { .type = NLA_U16 },
897};
898
899static int
900ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
901 const struct nlmsghdr *nlh,
902 const struct nlattr * const cda[])
903{
904 struct net *net = sock_net(ctnl);
905 struct nf_conntrack_tuple_hash *h;
906 struct nf_conntrack_tuple tuple;
907 struct nf_conn *ct;
908 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
909 u_int8_t u3 = nfmsg->nfgen_family;
910 u16 zone;
911 int err;
912
913 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
914 if (err < 0)
915 return err;
916
917 if (cda[CTA_TUPLE_ORIG])
918 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
919 else if (cda[CTA_TUPLE_REPLY])
920 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
921 else {
922 /* Flush the whole table */
923 nf_conntrack_flush_report(net,
924 NETLINK_CB(skb).pid,
925 nlmsg_report(nlh));
926 return 0;
927 }
928
929 if (err < 0)
930 return err;
931
932 h = nf_conntrack_find_get(net, zone, &tuple);
933 if (!h)
934 return -ENOENT;
935
936 ct = nf_ct_tuplehash_to_ctrack(h);
937
938 if (cda[CTA_ID]) {
939 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
940 if (id != (u32)(unsigned long)ct) {
941 nf_ct_put(ct);
942 return -ENOENT;
943 }
944 }
945
946 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
947 NETLINK_CB(skb).pid,
948 nlmsg_report(nlh)) < 0) {
949 nf_ct_delete_from_lists(ct);
950 /* we failed to report the event, try later */
951 nf_ct_insert_dying_list(ct);
952 nf_ct_put(ct);
953 return 0;
954 }
955
956 /* death_by_timeout would report the event again */
957 set_bit(IPS_DYING_BIT, &ct->status);
958
959 nf_ct_kill(ct);
960 nf_ct_put(ct);
961
962 return 0;
963}
964
965static int
966ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
967 const struct nlmsghdr *nlh,
968 const struct nlattr * const cda[])
969{
970 struct net *net = sock_net(ctnl);
971 struct nf_conntrack_tuple_hash *h;
972 struct nf_conntrack_tuple tuple;
973 struct nf_conn *ct;
974 struct sk_buff *skb2 = NULL;
975 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
976 u_int8_t u3 = nfmsg->nfgen_family;
977 u16 zone;
978 int err;
979
980 if (nlh->nlmsg_flags & NLM_F_DUMP)
981 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
982 ctnetlink_done, 0);
983
984 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
985 if (err < 0)
986 return err;
987
988 if (cda[CTA_TUPLE_ORIG])
989 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
990 else if (cda[CTA_TUPLE_REPLY])
991 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
992 else
993 return -EINVAL;
994
995 if (err < 0)
996 return err;
997
998 h = nf_conntrack_find_get(net, zone, &tuple);
999 if (!h)
1000 return -ENOENT;
1001
1002 ct = nf_ct_tuplehash_to_ctrack(h);
1003
1004 err = -ENOMEM;
1005 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1006 if (skb2 == NULL) {
1007 nf_ct_put(ct);
1008 return -ENOMEM;
1009 }
1010
1011 rcu_read_lock();
1012 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
1013 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1014 rcu_read_unlock();
1015 nf_ct_put(ct);
1016 if (err <= 0)
1017 goto free;
1018
1019 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1020 if (err < 0)
1021 goto out;
1022
1023 return 0;
1024
1025free:
1026 kfree_skb(skb2);
1027out:
1028 /* this avoids a loop in nfnetlink. */
1029 return err == -EAGAIN ? -ENOBUFS : err;
1030}
1031
1032#ifdef CONFIG_NF_NAT_NEEDED
1033static int
1034ctnetlink_parse_nat_setup(struct nf_conn *ct,
1035 enum nf_nat_manip_type manip,
1036 const struct nlattr *attr)
1037{
1038 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1039
1040 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1041 if (!parse_nat_setup) {
1042#ifdef CONFIG_MODULES
1043 rcu_read_unlock();
1044 spin_unlock_bh(&nf_conntrack_lock);
1045 nfnl_unlock();
1046 if (request_module("nf-nat-ipv4") < 0) {
1047 nfnl_lock();
1048 spin_lock_bh(&nf_conntrack_lock);
1049 rcu_read_lock();
1050 return -EOPNOTSUPP;
1051 }
1052 nfnl_lock();
1053 spin_lock_bh(&nf_conntrack_lock);
1054 rcu_read_lock();
1055 if (nfnetlink_parse_nat_setup_hook)
1056 return -EAGAIN;
1057#endif
1058 return -EOPNOTSUPP;
1059 }
1060
1061 return parse_nat_setup(ct, manip, attr);
1062}
1063#endif
1064
1065static int
1066ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1067{
1068 unsigned long d;
1069 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1070 d = ct->status ^ status;
1071
1072 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1073 /* unchangeable */
1074 return -EBUSY;
1075
1076 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1077 /* SEEN_REPLY bit can only be set */
1078 return -EBUSY;
1079
1080 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1081 /* ASSURED bit can only be set */
1082 return -EBUSY;
1083
1084 /* Be careful here, modifying NAT bits can screw up things,
1085 * so don't let users modify them directly if they don't pass
1086 * nf_nat_range. */
1087 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1088 return 0;
1089}
1090
1091static int
1092ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1093{
1094#ifdef CONFIG_NF_NAT_NEEDED
1095 int ret;
1096
1097 if (cda[CTA_NAT_DST]) {
1098 ret = ctnetlink_parse_nat_setup(ct,
1099 NF_NAT_MANIP_DST,
1100 cda[CTA_NAT_DST]);
1101 if (ret < 0)
1102 return ret;
1103 }
1104 if (cda[CTA_NAT_SRC]) {
1105 ret = ctnetlink_parse_nat_setup(ct,
1106 NF_NAT_MANIP_SRC,
1107 cda[CTA_NAT_SRC]);
1108 if (ret < 0)
1109 return ret;
1110 }
1111 return 0;
1112#else
1113 return -EOPNOTSUPP;
1114#endif
1115}
1116
1117static inline int
1118ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1119{
1120 struct nf_conntrack_helper *helper;
1121 struct nf_conn_help *help = nfct_help(ct);
1122 char *helpname = NULL;
1123 int err;
1124
1125 /* don't change helper of sibling connections */
1126 if (ct->master)
1127 return -EBUSY;
1128
1129 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1130 if (err < 0)
1131 return err;
1132
1133 if (!strcmp(helpname, "")) {
1134 if (help && help->helper) {
1135 /* we had a helper before ... */
1136 nf_ct_remove_expectations(ct);
1137 RCU_INIT_POINTER(help->helper, NULL);
1138 }
1139
1140 return 0;
1141 }
1142
1143 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1144 nf_ct_protonum(ct));
1145 if (helper == NULL) {
1146#ifdef CONFIG_MODULES
1147 spin_unlock_bh(&nf_conntrack_lock);
1148
1149 if (request_module("nfct-helper-%s", helpname) < 0) {
1150 spin_lock_bh(&nf_conntrack_lock);
1151 return -EOPNOTSUPP;
1152 }
1153
1154 spin_lock_bh(&nf_conntrack_lock);
1155 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1156 nf_ct_protonum(ct));
1157 if (helper)
1158 return -EAGAIN;
1159#endif
1160 return -EOPNOTSUPP;
1161 }
1162
1163 if (help) {
1164 if (help->helper == helper)
1165 return 0;
1166 if (help->helper)
1167 return -EBUSY;
1168 /* need to zero data of old helper */
1169 memset(&help->help, 0, sizeof(help->help));
1170 } else {
1171 /* we cannot set a helper for an existing conntrack */
1172 return -EOPNOTSUPP;
1173 }
1174
1175 rcu_assign_pointer(help->helper, helper);
1176
1177 return 0;
1178}
1179
1180static inline int
1181ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1182{
1183 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1184
1185 if (!del_timer(&ct->timeout))
1186 return -ETIME;
1187
1188 ct->timeout.expires = jiffies + timeout * HZ;
1189 add_timer(&ct->timeout);
1190
1191 return 0;
1192}
1193
1194static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1195 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1196 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1197 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1198};
1199
1200static inline int
1201ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1202{
1203 const struct nlattr *attr = cda[CTA_PROTOINFO];
1204 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1205 struct nf_conntrack_l4proto *l4proto;
1206 int err = 0;
1207
1208 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1209
1210 rcu_read_lock();
1211 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1212 if (l4proto->from_nlattr)
1213 err = l4proto->from_nlattr(tb, ct);
1214 rcu_read_unlock();
1215
1216 return err;
1217}
1218
1219#ifdef CONFIG_NF_NAT_NEEDED
1220static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1221 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1222 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1223 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1224};
1225
1226static inline int
1227change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1228{
1229 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1230
1231 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1232
1233 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1234 return -EINVAL;
1235
1236 natseq->correction_pos =
1237 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1238
1239 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1240 return -EINVAL;
1241
1242 natseq->offset_before =
1243 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1244
1245 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1246 return -EINVAL;
1247
1248 natseq->offset_after =
1249 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1250
1251 return 0;
1252}
1253
1254static int
1255ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1256 const struct nlattr * const cda[])
1257{
1258 int ret = 0;
1259 struct nf_conn_nat *nat = nfct_nat(ct);
1260
1261 if (!nat)
1262 return 0;
1263
1264 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1265 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1266 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1267 if (ret < 0)
1268 return ret;
1269
1270 ct->status |= IPS_SEQ_ADJUST;
1271 }
1272
1273 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1274 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1275 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1276 if (ret < 0)
1277 return ret;
1278
1279 ct->status |= IPS_SEQ_ADJUST;
1280 }
1281
1282 return 0;
1283}
1284#endif
1285
1286static int
1287ctnetlink_change_conntrack(struct nf_conn *ct,
1288 const struct nlattr * const cda[])
1289{
1290 int err;
1291
1292 /* only allow NAT changes and master assignation for new conntracks */
1293 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1294 return -EOPNOTSUPP;
1295
1296 if (cda[CTA_HELP]) {
1297 err = ctnetlink_change_helper(ct, cda);
1298 if (err < 0)
1299 return err;
1300 }
1301
1302 if (cda[CTA_TIMEOUT]) {
1303 err = ctnetlink_change_timeout(ct, cda);
1304 if (err < 0)
1305 return err;
1306 }
1307
1308 if (cda[CTA_STATUS]) {
1309 err = ctnetlink_change_status(ct, cda);
1310 if (err < 0)
1311 return err;
1312 }
1313
1314 if (cda[CTA_PROTOINFO]) {
1315 err = ctnetlink_change_protoinfo(ct, cda);
1316 if (err < 0)
1317 return err;
1318 }
1319
1320#if defined(CONFIG_NF_CONNTRACK_MARK)
1321 if (cda[CTA_MARK])
1322 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1323#endif
1324
1325#ifdef CONFIG_NF_NAT_NEEDED
1326 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1327 err = ctnetlink_change_nat_seq_adj(ct, cda);
1328 if (err < 0)
1329 return err;
1330 }
1331#endif
1332
1333 return 0;
1334}
1335
1336static struct nf_conn *
1337ctnetlink_create_conntrack(struct net *net, u16 zone,
1338 const struct nlattr * const cda[],
1339 struct nf_conntrack_tuple *otuple,
1340 struct nf_conntrack_tuple *rtuple,
1341 u8 u3)
1342{
1343 struct nf_conn *ct;
1344 int err = -EINVAL;
1345 struct nf_conntrack_helper *helper;
1346 struct nf_conn_tstamp *tstamp;
1347
1348 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1349 if (IS_ERR(ct))
1350 return ERR_PTR(-ENOMEM);
1351
1352 if (!cda[CTA_TIMEOUT])
1353 goto err1;
1354 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1355
1356 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1357
1358 rcu_read_lock();
1359 if (cda[CTA_HELP]) {
1360 char *helpname = NULL;
1361
1362 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1363 if (err < 0)
1364 goto err2;
1365
1366 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1367 nf_ct_protonum(ct));
1368 if (helper == NULL) {
1369 rcu_read_unlock();
1370 spin_unlock_bh(&nf_conntrack_lock);
1371#ifdef CONFIG_MODULES
1372 if (request_module("nfct-helper-%s", helpname) < 0) {
1373 spin_lock_bh(&nf_conntrack_lock);
1374 err = -EOPNOTSUPP;
1375 goto err1;
1376 }
1377
1378 spin_lock_bh(&nf_conntrack_lock);
1379 rcu_read_lock();
1380 helper = __nf_conntrack_helper_find(helpname,
1381 nf_ct_l3num(ct),
1382 nf_ct_protonum(ct));
1383 if (helper) {
1384 err = -EAGAIN;
1385 goto err2;
1386 }
1387 rcu_read_unlock();
1388#endif
1389 err = -EOPNOTSUPP;
1390 goto err1;
1391 } else {
1392 struct nf_conn_help *help;
1393
1394 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1395 if (help == NULL) {
1396 err = -ENOMEM;
1397 goto err2;
1398 }
1399
1400 /* not in hash table yet so not strictly necessary */
1401 RCU_INIT_POINTER(help->helper, helper);
1402 }
1403 } else {
1404 /* try an implicit helper assignation */
1405 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1406 if (err < 0)
1407 goto err2;
1408 }
1409
1410 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1411 err = ctnetlink_change_nat(ct, cda);
1412 if (err < 0)
1413 goto err2;
1414 }
1415
1416 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1417 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1418 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1419 /* we must add conntrack extensions before confirmation. */
1420 ct->status |= IPS_CONFIRMED;
1421
1422 if (cda[CTA_STATUS]) {
1423 err = ctnetlink_change_status(ct, cda);
1424 if (err < 0)
1425 goto err2;
1426 }
1427
1428#ifdef CONFIG_NF_NAT_NEEDED
1429 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1430 err = ctnetlink_change_nat_seq_adj(ct, cda);
1431 if (err < 0)
1432 goto err2;
1433 }
1434#endif
1435
1436 memset(&ct->proto, 0, sizeof(ct->proto));
1437 if (cda[CTA_PROTOINFO]) {
1438 err = ctnetlink_change_protoinfo(ct, cda);
1439 if (err < 0)
1440 goto err2;
1441 }
1442
1443#if defined(CONFIG_NF_CONNTRACK_MARK)
1444 if (cda[CTA_MARK])
1445 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1446#endif
1447
1448 /* setup master conntrack: this is a confirmed expectation */
1449 if (cda[CTA_TUPLE_MASTER]) {
1450 struct nf_conntrack_tuple master;
1451 struct nf_conntrack_tuple_hash *master_h;
1452 struct nf_conn *master_ct;
1453
1454 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1455 if (err < 0)
1456 goto err2;
1457
1458 master_h = nf_conntrack_find_get(net, zone, &master);
1459 if (master_h == NULL) {
1460 err = -ENOENT;
1461 goto err2;
1462 }
1463 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1464 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1465 ct->master = master_ct;
1466 }
1467 tstamp = nf_conn_tstamp_find(ct);
1468 if (tstamp)
1469 tstamp->start = ktime_to_ns(ktime_get_real());
1470
1471 add_timer(&ct->timeout);
1472 nf_conntrack_hash_insert(ct);
1473 rcu_read_unlock();
1474
1475 return ct;
1476
1477err2:
1478 rcu_read_unlock();
1479err1:
1480 nf_conntrack_free(ct);
1481 return ERR_PTR(err);
1482}
1483
1484static int
1485ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1486 const struct nlmsghdr *nlh,
1487 const struct nlattr * const cda[])
1488{
1489 struct net *net = sock_net(ctnl);
1490 struct nf_conntrack_tuple otuple, rtuple;
1491 struct nf_conntrack_tuple_hash *h = NULL;
1492 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1493 u_int8_t u3 = nfmsg->nfgen_family;
1494 u16 zone;
1495 int err;
1496
1497 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1498 if (err < 0)
1499 return err;
1500
1501 if (cda[CTA_TUPLE_ORIG]) {
1502 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1503 if (err < 0)
1504 return err;
1505 }
1506
1507 if (cda[CTA_TUPLE_REPLY]) {
1508 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1509 if (err < 0)
1510 return err;
1511 }
1512
1513 spin_lock_bh(&nf_conntrack_lock);
1514 if (cda[CTA_TUPLE_ORIG])
1515 h = __nf_conntrack_find(net, zone, &otuple);
1516 else if (cda[CTA_TUPLE_REPLY])
1517 h = __nf_conntrack_find(net, zone, &rtuple);
1518
1519 if (h == NULL) {
1520 err = -ENOENT;
1521 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1522 struct nf_conn *ct;
1523 enum ip_conntrack_events events;
1524
1525 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1526 &rtuple, u3);
1527 if (IS_ERR(ct)) {
1528 err = PTR_ERR(ct);
1529 goto out_unlock;
1530 }
1531 err = 0;
1532 nf_conntrack_get(&ct->ct_general);
1533 spin_unlock_bh(&nf_conntrack_lock);
1534 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1535 events = IPCT_RELATED;
1536 else
1537 events = IPCT_NEW;
1538
1539 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1540 (1 << IPCT_ASSURED) |
1541 (1 << IPCT_HELPER) |
1542 (1 << IPCT_PROTOINFO) |
1543 (1 << IPCT_NATSEQADJ) |
1544 (1 << IPCT_MARK) | events,
1545 ct, NETLINK_CB(skb).pid,
1546 nlmsg_report(nlh));
1547 nf_ct_put(ct);
1548 } else
1549 spin_unlock_bh(&nf_conntrack_lock);
1550
1551 return err;
1552 }
1553 /* implicit 'else' */
1554
1555 /* We manipulate the conntrack inside the global conntrack table lock,
1556 * so there's no need to increase the refcount */
1557 err = -EEXIST;
1558 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1559 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1560
1561 err = ctnetlink_change_conntrack(ct, cda);
1562 if (err == 0) {
1563 nf_conntrack_get(&ct->ct_general);
1564 spin_unlock_bh(&nf_conntrack_lock);
1565 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1566 (1 << IPCT_ASSURED) |
1567 (1 << IPCT_HELPER) |
1568 (1 << IPCT_PROTOINFO) |
1569 (1 << IPCT_NATSEQADJ) |
1570 (1 << IPCT_MARK),
1571 ct, NETLINK_CB(skb).pid,
1572 nlmsg_report(nlh));
1573 nf_ct_put(ct);
1574 } else
1575 spin_unlock_bh(&nf_conntrack_lock);
1576
1577 return err;
1578 }
1579
1580out_unlock:
1581 spin_unlock_bh(&nf_conntrack_lock);
1582 return err;
1583}
1584
1585/***********************************************************************
1586 * EXPECT
1587 ***********************************************************************/
1588
1589static inline int
1590ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1591 const struct nf_conntrack_tuple *tuple,
1592 enum ctattr_expect type)
1593{
1594 struct nlattr *nest_parms;
1595
1596 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1597 if (!nest_parms)
1598 goto nla_put_failure;
1599 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1600 goto nla_put_failure;
1601 nla_nest_end(skb, nest_parms);
1602
1603 return 0;
1604
1605nla_put_failure:
1606 return -1;
1607}
1608
1609static inline int
1610ctnetlink_exp_dump_mask(struct sk_buff *skb,
1611 const struct nf_conntrack_tuple *tuple,
1612 const struct nf_conntrack_tuple_mask *mask)
1613{
1614 int ret;
1615 struct nf_conntrack_l3proto *l3proto;
1616 struct nf_conntrack_l4proto *l4proto;
1617 struct nf_conntrack_tuple m;
1618 struct nlattr *nest_parms;
1619
1620 memset(&m, 0xFF, sizeof(m));
1621 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1622 m.src.u.all = mask->src.u.all;
1623 m.dst.protonum = tuple->dst.protonum;
1624
1625 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1626 if (!nest_parms)
1627 goto nla_put_failure;
1628
1629 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1630 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1631
1632 if (unlikely(ret < 0))
1633 goto nla_put_failure;
1634
1635 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1636 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1637 if (unlikely(ret < 0))
1638 goto nla_put_failure;
1639
1640 nla_nest_end(skb, nest_parms);
1641
1642 return 0;
1643
1644nla_put_failure:
1645 return -1;
1646}
1647
1648static int
1649ctnetlink_exp_dump_expect(struct sk_buff *skb,
1650 const struct nf_conntrack_expect *exp)
1651{
1652 struct nf_conn *master = exp->master;
1653 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
1654 struct nf_conn_help *help;
1655
1656 if (timeout < 0)
1657 timeout = 0;
1658
1659 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1660 goto nla_put_failure;
1661 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1662 goto nla_put_failure;
1663 if (ctnetlink_exp_dump_tuple(skb,
1664 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1665 CTA_EXPECT_MASTER) < 0)
1666 goto nla_put_failure;
1667
1668 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1669 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1670 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1671 help = nfct_help(master);
1672 if (help) {
1673 struct nf_conntrack_helper *helper;
1674
1675 helper = rcu_dereference(help->helper);
1676 if (helper)
1677 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1678 }
1679
1680 return 0;
1681
1682nla_put_failure:
1683 return -1;
1684}
1685
1686static int
1687ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1688 int event, const struct nf_conntrack_expect *exp)
1689{
1690 struct nlmsghdr *nlh;
1691 struct nfgenmsg *nfmsg;
1692 unsigned int flags = pid ? NLM_F_MULTI : 0;
1693
1694 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1695 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1696 if (nlh == NULL)
1697 goto nlmsg_failure;
1698
1699 nfmsg = nlmsg_data(nlh);
1700 nfmsg->nfgen_family = exp->tuple.src.l3num;
1701 nfmsg->version = NFNETLINK_V0;
1702 nfmsg->res_id = 0;
1703
1704 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1705 goto nla_put_failure;
1706
1707 nlmsg_end(skb, nlh);
1708 return skb->len;
1709
1710nlmsg_failure:
1711nla_put_failure:
1712 nlmsg_cancel(skb, nlh);
1713 return -1;
1714}
1715
1716#ifdef CONFIG_NF_CONNTRACK_EVENTS
1717static int
1718ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1719{
1720 struct nf_conntrack_expect *exp = item->exp;
1721 struct net *net = nf_ct_exp_net(exp);
1722 struct nlmsghdr *nlh;
1723 struct nfgenmsg *nfmsg;
1724 struct sk_buff *skb;
1725 unsigned int type, group;
1726 int flags = 0;
1727
1728 if (events & (1 << IPEXP_DESTROY)) {
1729 type = IPCTNL_MSG_EXP_DELETE;
1730 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1731 } else if (events & (1 << IPEXP_NEW)) {
1732 type = IPCTNL_MSG_EXP_NEW;
1733 flags = NLM_F_CREATE|NLM_F_EXCL;
1734 group = NFNLGRP_CONNTRACK_EXP_NEW;
1735 } else
1736 return 0;
1737
1738 if (!item->report && !nfnetlink_has_listeners(net, group))
1739 return 0;
1740
1741 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1742 if (skb == NULL)
1743 goto errout;
1744
1745 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1746 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1747 if (nlh == NULL)
1748 goto nlmsg_failure;
1749
1750 nfmsg = nlmsg_data(nlh);
1751 nfmsg->nfgen_family = exp->tuple.src.l3num;
1752 nfmsg->version = NFNETLINK_V0;
1753 nfmsg->res_id = 0;
1754
1755 rcu_read_lock();
1756 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1757 goto nla_put_failure;
1758 rcu_read_unlock();
1759
1760 nlmsg_end(skb, nlh);
1761 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1762 return 0;
1763
1764nla_put_failure:
1765 rcu_read_unlock();
1766 nlmsg_cancel(skb, nlh);
1767nlmsg_failure:
1768 kfree_skb(skb);
1769errout:
1770 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1771 return 0;
1772}
1773#endif
1774static int ctnetlink_exp_done(struct netlink_callback *cb)
1775{
1776 if (cb->args[1])
1777 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1778 return 0;
1779}
1780
1781static int
1782ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1783{
1784 struct net *net = sock_net(skb->sk);
1785 struct nf_conntrack_expect *exp, *last;
1786 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1787 struct hlist_node *n;
1788 u_int8_t l3proto = nfmsg->nfgen_family;
1789
1790 rcu_read_lock();
1791 last = (struct nf_conntrack_expect *)cb->args[1];
1792 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1793restart:
1794 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1795 hnode) {
1796 if (l3proto && exp->tuple.src.l3num != l3proto)
1797 continue;
1798 if (cb->args[1]) {
1799 if (exp != last)
1800 continue;
1801 cb->args[1] = 0;
1802 }
1803 if (ctnetlink_exp_fill_info(skb,
1804 NETLINK_CB(cb->skb).pid,
1805 cb->nlh->nlmsg_seq,
1806 IPCTNL_MSG_EXP_NEW,
1807 exp) < 0) {
1808 if (!atomic_inc_not_zero(&exp->use))
1809 continue;
1810 cb->args[1] = (unsigned long)exp;
1811 goto out;
1812 }
1813 }
1814 if (cb->args[1]) {
1815 cb->args[1] = 0;
1816 goto restart;
1817 }
1818 }
1819out:
1820 rcu_read_unlock();
1821 if (last)
1822 nf_ct_expect_put(last);
1823
1824 return skb->len;
1825}
1826
1827static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1828 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1829 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1830 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1831 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1832 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1833 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1834 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1835 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1836};
1837
1838static int
1839ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1840 const struct nlmsghdr *nlh,
1841 const struct nlattr * const cda[])
1842{
1843 struct net *net = sock_net(ctnl);
1844 struct nf_conntrack_tuple tuple;
1845 struct nf_conntrack_expect *exp;
1846 struct sk_buff *skb2;
1847 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1848 u_int8_t u3 = nfmsg->nfgen_family;
1849 u16 zone;
1850 int err;
1851
1852 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1853 return netlink_dump_start(ctnl, skb, nlh,
1854 ctnetlink_exp_dump_table,
1855 ctnetlink_exp_done, 0);
1856 }
1857
1858 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1859 if (err < 0)
1860 return err;
1861
1862 if (cda[CTA_EXPECT_TUPLE])
1863 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1864 else if (cda[CTA_EXPECT_MASTER])
1865 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1866 else
1867 return -EINVAL;
1868
1869 if (err < 0)
1870 return err;
1871
1872 exp = nf_ct_expect_find_get(net, zone, &tuple);
1873 if (!exp)
1874 return -ENOENT;
1875
1876 if (cda[CTA_EXPECT_ID]) {
1877 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1878 if (ntohl(id) != (u32)(unsigned long)exp) {
1879 nf_ct_expect_put(exp);
1880 return -ENOENT;
1881 }
1882 }
1883
1884 err = -ENOMEM;
1885 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1886 if (skb2 == NULL) {
1887 nf_ct_expect_put(exp);
1888 goto out;
1889 }
1890
1891 rcu_read_lock();
1892 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1893 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1894 rcu_read_unlock();
1895 nf_ct_expect_put(exp);
1896 if (err <= 0)
1897 goto free;
1898
1899 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1900 if (err < 0)
1901 goto out;
1902
1903 return 0;
1904
1905free:
1906 kfree_skb(skb2);
1907out:
1908 /* this avoids a loop in nfnetlink. */
1909 return err == -EAGAIN ? -ENOBUFS : err;
1910}
1911
1912static int
1913ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1914 const struct nlmsghdr *nlh,
1915 const struct nlattr * const cda[])
1916{
1917 struct net *net = sock_net(ctnl);
1918 struct nf_conntrack_expect *exp;
1919 struct nf_conntrack_tuple tuple;
1920 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1921 struct hlist_node *n, *next;
1922 u_int8_t u3 = nfmsg->nfgen_family;
1923 unsigned int i;
1924 u16 zone;
1925 int err;
1926
1927 if (cda[CTA_EXPECT_TUPLE]) {
1928 /* delete a single expect by tuple */
1929 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1930 if (err < 0)
1931 return err;
1932
1933 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1934 if (err < 0)
1935 return err;
1936
1937 /* bump usage count to 2 */
1938 exp = nf_ct_expect_find_get(net, zone, &tuple);
1939 if (!exp)
1940 return -ENOENT;
1941
1942 if (cda[CTA_EXPECT_ID]) {
1943 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1944 if (ntohl(id) != (u32)(unsigned long)exp) {
1945 nf_ct_expect_put(exp);
1946 return -ENOENT;
1947 }
1948 }
1949
1950 /* after list removal, usage count == 1 */
1951 spin_lock_bh(&nf_conntrack_lock);
1952 if (del_timer(&exp->timeout)) {
1953 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1954 nlmsg_report(nlh));
1955 nf_ct_expect_put(exp);
1956 }
1957 spin_unlock_bh(&nf_conntrack_lock);
1958 /* have to put what we 'get' above.
1959 * after this line usage count == 0 */
1960 nf_ct_expect_put(exp);
1961 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1962 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1963 struct nf_conn_help *m_help;
1964
1965 /* delete all expectations for this helper */
1966 spin_lock_bh(&nf_conntrack_lock);
1967 for (i = 0; i < nf_ct_expect_hsize; i++) {
1968 hlist_for_each_entry_safe(exp, n, next,
1969 &net->ct.expect_hash[i],
1970 hnode) {
1971 m_help = nfct_help(exp->master);
1972 if (!strcmp(m_help->helper->name, name) &&
1973 del_timer(&exp->timeout)) {
1974 nf_ct_unlink_expect_report(exp,
1975 NETLINK_CB(skb).pid,
1976 nlmsg_report(nlh));
1977 nf_ct_expect_put(exp);
1978 }
1979 }
1980 }
1981 spin_unlock_bh(&nf_conntrack_lock);
1982 } else {
1983 /* This basically means we have to flush everything*/
1984 spin_lock_bh(&nf_conntrack_lock);
1985 for (i = 0; i < nf_ct_expect_hsize; i++) {
1986 hlist_for_each_entry_safe(exp, n, next,
1987 &net->ct.expect_hash[i],
1988 hnode) {
1989 if (del_timer(&exp->timeout)) {
1990 nf_ct_unlink_expect_report(exp,
1991 NETLINK_CB(skb).pid,
1992 nlmsg_report(nlh));
1993 nf_ct_expect_put(exp);
1994 }
1995 }
1996 }
1997 spin_unlock_bh(&nf_conntrack_lock);
1998 }
1999
2000 return 0;
2001}
2002static int
2003ctnetlink_change_expect(struct nf_conntrack_expect *x,
2004 const struct nlattr * const cda[])
2005{
2006 return -EOPNOTSUPP;
2007}
2008
2009static int
2010ctnetlink_create_expect(struct net *net, u16 zone,
2011 const struct nlattr * const cda[],
2012 u_int8_t u3,
2013 u32 pid, int report)
2014{
2015 struct nf_conntrack_tuple tuple, mask, master_tuple;
2016 struct nf_conntrack_tuple_hash *h = NULL;
2017 struct nf_conntrack_expect *exp;
2018 struct nf_conn *ct;
2019 struct nf_conn_help *help;
2020 int err = 0;
2021
2022 /* caller guarantees that those three CTA_EXPECT_* exist */
2023 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2024 if (err < 0)
2025 return err;
2026 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2027 if (err < 0)
2028 return err;
2029 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2030 if (err < 0)
2031 return err;
2032
2033 /* Look for master conntrack of this expectation */
2034 h = nf_conntrack_find_get(net, zone, &master_tuple);
2035 if (!h)
2036 return -ENOENT;
2037 ct = nf_ct_tuplehash_to_ctrack(h);
2038 exp = nf_ct_expect_alloc(ct);
2039 if (!exp) {
2040 err = -ENOMEM;
2041 goto out;
2042 }
2043 help = nfct_help(ct);
2044 if (!help) {
2045 if (!cda[CTA_EXPECT_TIMEOUT]) {
2046 err = -EINVAL;
2047 goto out;
2048 }
2049 exp->timeout.expires =
2050 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2051
2052 exp->flags = NF_CT_EXPECT_USERSPACE;
2053 if (cda[CTA_EXPECT_FLAGS]) {
2054 exp->flags |=
2055 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2056 }
2057 } else {
2058 if (cda[CTA_EXPECT_FLAGS]) {
2059 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2060 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2061 } else
2062 exp->flags = 0;
2063 }
2064
2065 exp->class = 0;
2066 exp->expectfn = NULL;
2067 exp->master = ct;
2068 exp->helper = NULL;
2069 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2070 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2071 exp->mask.src.u.all = mask.src.u.all;
2072
2073 err = nf_ct_expect_related_report(exp, pid, report);
2074 nf_ct_expect_put(exp);
2075
2076out:
2077 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2078 return err;
2079}
2080
2081static int
2082ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2083 const struct nlmsghdr *nlh,
2084 const struct nlattr * const cda[])
2085{
2086 struct net *net = sock_net(ctnl);
2087 struct nf_conntrack_tuple tuple;
2088 struct nf_conntrack_expect *exp;
2089 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2090 u_int8_t u3 = nfmsg->nfgen_family;
2091 u16 zone;
2092 int err;
2093
2094 if (!cda[CTA_EXPECT_TUPLE]
2095 || !cda[CTA_EXPECT_MASK]
2096 || !cda[CTA_EXPECT_MASTER])
2097 return -EINVAL;
2098
2099 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2100 if (err < 0)
2101 return err;
2102
2103 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2104 if (err < 0)
2105 return err;
2106
2107 spin_lock_bh(&nf_conntrack_lock);
2108 exp = __nf_ct_expect_find(net, zone, &tuple);
2109
2110 if (!exp) {
2111 spin_unlock_bh(&nf_conntrack_lock);
2112 err = -ENOENT;
2113 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2114 err = ctnetlink_create_expect(net, zone, cda,
2115 u3,
2116 NETLINK_CB(skb).pid,
2117 nlmsg_report(nlh));
2118 }
2119 return err;
2120 }
2121
2122 err = -EEXIST;
2123 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2124 err = ctnetlink_change_expect(exp, cda);
2125 spin_unlock_bh(&nf_conntrack_lock);
2126
2127 return err;
2128}
2129
2130#ifdef CONFIG_NF_CONNTRACK_EVENTS
2131static struct nf_ct_event_notifier ctnl_notifier = {
2132 .fcn = ctnetlink_conntrack_event,
2133};
2134
2135static struct nf_exp_event_notifier ctnl_notifier_exp = {
2136 .fcn = ctnetlink_expect_event,
2137};
2138#endif
2139
2140static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2141 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2142 .attr_count = CTA_MAX,
2143 .policy = ct_nla_policy },
2144 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2145 .attr_count = CTA_MAX,
2146 .policy = ct_nla_policy },
2147 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2148 .attr_count = CTA_MAX,
2149 .policy = ct_nla_policy },
2150 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2151 .attr_count = CTA_MAX,
2152 .policy = ct_nla_policy },
2153};
2154
2155static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2156 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2157 .attr_count = CTA_EXPECT_MAX,
2158 .policy = exp_nla_policy },
2159 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2160 .attr_count = CTA_EXPECT_MAX,
2161 .policy = exp_nla_policy },
2162 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2163 .attr_count = CTA_EXPECT_MAX,
2164 .policy = exp_nla_policy },
2165};
2166
2167static const struct nfnetlink_subsystem ctnl_subsys = {
2168 .name = "conntrack",
2169 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2170 .cb_count = IPCTNL_MSG_MAX,
2171 .cb = ctnl_cb,
2172};
2173
2174static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2175 .name = "conntrack_expect",
2176 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2177 .cb_count = IPCTNL_MSG_EXP_MAX,
2178 .cb = ctnl_exp_cb,
2179};
2180
2181MODULE_ALIAS("ip_conntrack_netlink");
2182MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2183MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2184
2185static int __net_init ctnetlink_net_init(struct net *net)
2186{
2187#ifdef CONFIG_NF_CONNTRACK_EVENTS
2188 int ret;
2189
2190 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
2191 if (ret < 0) {
2192 pr_err("ctnetlink_init: cannot register notifier.\n");
2193 goto err_out;
2194 }
2195
2196 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
2197 if (ret < 0) {
2198 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2199 goto err_unreg_notifier;
2200 }
2201#endif
2202 return 0;
2203
2204#ifdef CONFIG_NF_CONNTRACK_EVENTS
2205err_unreg_notifier:
2206 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2207err_out:
2208 return ret;
2209#endif
2210}
2211
2212static void ctnetlink_net_exit(struct net *net)
2213{
2214#ifdef CONFIG_NF_CONNTRACK_EVENTS
2215 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
2216 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2217#endif
2218}
2219
2220static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
2221{
2222 struct net *net;
2223
2224 list_for_each_entry(net, net_exit_list, exit_list)
2225 ctnetlink_net_exit(net);
2226}
2227
2228static struct pernet_operations ctnetlink_net_ops = {
2229 .init = ctnetlink_net_init,
2230 .exit_batch = ctnetlink_net_exit_batch,
2231};
2232
2233static int __init ctnetlink_init(void)
2234{
2235 int ret;
2236
2237 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2238 ret = nfnetlink_subsys_register(&ctnl_subsys);
2239 if (ret < 0) {
2240 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2241 goto err_out;
2242 }
2243
2244 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2245 if (ret < 0) {
2246 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2247 goto err_unreg_subsys;
2248 }
2249
2250 if (register_pernet_subsys(&ctnetlink_net_ops)) {
2251 pr_err("ctnetlink_init: cannot register pernet operations\n");
2252 goto err_unreg_exp_subsys;
2253 }
2254
2255 return 0;
2256
2257err_unreg_exp_subsys:
2258 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2259err_unreg_subsys:
2260 nfnetlink_subsys_unregister(&ctnl_subsys);
2261err_out:
2262 return ret;
2263}
2264
2265static void __exit ctnetlink_exit(void)
2266{
2267 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2268
2269 unregister_pernet_subsys(&ctnetlink_net_ops);
2270 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2271 nfnetlink_subsys_unregister(&ctnl_subsys);
2272}
2273
2274module_init(ctnetlink_init);
2275module_exit(ctnetlink_exit);
kernel source for telekom puls (alcatel/mediatek)