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netfilter: x_tables: dont block BH while reading counters
[deliverable/linux.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) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/rculist.h>
22#include <linux/rculist_nulls.h>
23#include <linux/types.h>
24#include <linux/timer.h>
25#include <linux/security.h>
26#include <linux/skbuff.h>
27#include <linux/errno.h>
28#include <linux/netlink.h>
29#include <linux/spinlock.h>
30#include <linux/interrupt.h>
31#include <linux/slab.h>
32
33#include <linux/netfilter.h>
34#include <net/netlink.h>
35#include <net/sock.h>
36#include <net/netfilter/nf_conntrack.h>
37#include <net/netfilter/nf_conntrack_core.h>
38#include <net/netfilter/nf_conntrack_expect.h>
39#include <net/netfilter/nf_conntrack_helper.h>
40#include <net/netfilter/nf_conntrack_l3proto.h>
41#include <net/netfilter/nf_conntrack_l4proto.h>
42#include <net/netfilter/nf_conntrack_tuple.h>
43#include <net/netfilter/nf_conntrack_acct.h>
44#include <net/netfilter/nf_conntrack_zones.h>
45#ifdef CONFIG_NF_NAT_NEEDED
46#include <net/netfilter/nf_nat_core.h>
47#include <net/netfilter/nf_nat_protocol.h>
48#endif
49
50#include <linux/netfilter/nfnetlink.h>
51#include <linux/netfilter/nfnetlink_conntrack.h>
52
53MODULE_LICENSE("GPL");
54
55static char __initdata version[] = "0.93";
56
57static inline int
58ctnetlink_dump_tuples_proto(struct sk_buff *skb,
59 const struct nf_conntrack_tuple *tuple,
60 struct nf_conntrack_l4proto *l4proto)
61{
62 int ret = 0;
63 struct nlattr *nest_parms;
64
65 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
66 if (!nest_parms)
67 goto nla_put_failure;
68 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
69
70 if (likely(l4proto->tuple_to_nlattr))
71 ret = l4proto->tuple_to_nlattr(skb, tuple);
72
73 nla_nest_end(skb, nest_parms);
74
75 return ret;
76
77nla_put_failure:
78 return -1;
79}
80
81static inline int
82ctnetlink_dump_tuples_ip(struct sk_buff *skb,
83 const struct nf_conntrack_tuple *tuple,
84 struct nf_conntrack_l3proto *l3proto)
85{
86 int ret = 0;
87 struct nlattr *nest_parms;
88
89 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
90 if (!nest_parms)
91 goto nla_put_failure;
92
93 if (likely(l3proto->tuple_to_nlattr))
94 ret = l3proto->tuple_to_nlattr(skb, tuple);
95
96 nla_nest_end(skb, nest_parms);
97
98 return ret;
99
100nla_put_failure:
101 return -1;
102}
103
104static int
105ctnetlink_dump_tuples(struct sk_buff *skb,
106 const struct nf_conntrack_tuple *tuple)
107{
108 int ret;
109 struct nf_conntrack_l3proto *l3proto;
110 struct nf_conntrack_l4proto *l4proto;
111
112 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
113 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
114
115 if (unlikely(ret < 0))
116 return ret;
117
118 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
119 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
120
121 return ret;
122}
123
124static inline int
125ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
126{
127 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
128 return 0;
129
130nla_put_failure:
131 return -1;
132}
133
134static inline int
135ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
136{
137 long timeout = (ct->timeout.expires - jiffies) / HZ;
138
139 if (timeout < 0)
140 timeout = 0;
141
142 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
143 return 0;
144
145nla_put_failure:
146 return -1;
147}
148
149static inline int
150ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
151{
152 struct nf_conntrack_l4proto *l4proto;
153 struct nlattr *nest_proto;
154 int ret;
155
156 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
157 if (!l4proto->to_nlattr)
158 return 0;
159
160 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
161 if (!nest_proto)
162 goto nla_put_failure;
163
164 ret = l4proto->to_nlattr(skb, nest_proto, ct);
165
166 nla_nest_end(skb, nest_proto);
167
168 return ret;
169
170nla_put_failure:
171 return -1;
172}
173
174static inline int
175ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
176{
177 struct nlattr *nest_helper;
178 const struct nf_conn_help *help = nfct_help(ct);
179 struct nf_conntrack_helper *helper;
180
181 if (!help)
182 return 0;
183
184 helper = rcu_dereference(help->helper);
185 if (!helper)
186 goto out;
187
188 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
189 if (!nest_helper)
190 goto nla_put_failure;
191 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
192
193 if (helper->to_nlattr)
194 helper->to_nlattr(skb, ct);
195
196 nla_nest_end(skb, nest_helper);
197out:
198 return 0;
199
200nla_put_failure:
201 return -1;
202}
203
204static int
205ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
206 enum ip_conntrack_dir dir)
207{
208 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
209 struct nlattr *nest_count;
210 const struct nf_conn_counter *acct;
211
212 acct = nf_conn_acct_find(ct);
213 if (!acct)
214 return 0;
215
216 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
217 if (!nest_count)
218 goto nla_put_failure;
219
220 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
221 cpu_to_be64(acct[dir].packets));
222 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
223 cpu_to_be64(acct[dir].bytes));
224
225 nla_nest_end(skb, nest_count);
226
227 return 0;
228
229nla_put_failure:
230 return -1;
231}
232
233#ifdef CONFIG_NF_CONNTRACK_MARK
234static inline int
235ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
236{
237 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
238 return 0;
239
240nla_put_failure:
241 return -1;
242}
243#else
244#define ctnetlink_dump_mark(a, b) (0)
245#endif
246
247#ifdef CONFIG_NF_CONNTRACK_SECMARK
248static inline int
249ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
250{
251 struct nlattr *nest_secctx;
252 int len, ret;
253 char *secctx;
254
255 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
256 if (ret)
257 return 0;
258
259 ret = -1;
260 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
261 if (!nest_secctx)
262 goto nla_put_failure;
263
264 NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
265 nla_nest_end(skb, nest_secctx);
266
267 ret = 0;
268nla_put_failure:
269 security_release_secctx(secctx, len);
270 return ret;
271}
272#else
273#define ctnetlink_dump_secctx(a, b) (0)
274#endif
275
276#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
277
278static inline int
279ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
280{
281 struct nlattr *nest_parms;
282
283 if (!(ct->status & IPS_EXPECTED))
284 return 0;
285
286 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
287 if (!nest_parms)
288 goto nla_put_failure;
289 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
290 goto nla_put_failure;
291 nla_nest_end(skb, nest_parms);
292
293 return 0;
294
295nla_put_failure:
296 return -1;
297}
298
299#ifdef CONFIG_NF_NAT_NEEDED
300static int
301dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
302{
303 struct nlattr *nest_parms;
304
305 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
306 if (!nest_parms)
307 goto nla_put_failure;
308
309 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
310 htonl(natseq->correction_pos));
311 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
312 htonl(natseq->offset_before));
313 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
314 htonl(natseq->offset_after));
315
316 nla_nest_end(skb, nest_parms);
317
318 return 0;
319
320nla_put_failure:
321 return -1;
322}
323
324static inline int
325ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
326{
327 struct nf_nat_seq *natseq;
328 struct nf_conn_nat *nat = nfct_nat(ct);
329
330 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
331 return 0;
332
333 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
334 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
335 return -1;
336
337 natseq = &nat->seq[IP_CT_DIR_REPLY];
338 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
339 return -1;
340
341 return 0;
342}
343#else
344#define ctnetlink_dump_nat_seq_adj(a, b) (0)
345#endif
346
347static inline int
348ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
349{
350 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
351 return 0;
352
353nla_put_failure:
354 return -1;
355}
356
357static inline int
358ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
359{
360 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
361 return 0;
362
363nla_put_failure:
364 return -1;
365}
366
367static int
368ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
369 int event, struct nf_conn *ct)
370{
371 struct nlmsghdr *nlh;
372 struct nfgenmsg *nfmsg;
373 struct nlattr *nest_parms;
374 unsigned int flags = pid ? NLM_F_MULTI : 0;
375
376 event |= NFNL_SUBSYS_CTNETLINK << 8;
377 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
378 if (nlh == NULL)
379 goto nlmsg_failure;
380
381 nfmsg = nlmsg_data(nlh);
382 nfmsg->nfgen_family = nf_ct_l3num(ct);
383 nfmsg->version = NFNETLINK_V0;
384 nfmsg->res_id = 0;
385
386 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
387 if (!nest_parms)
388 goto nla_put_failure;
389 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
390 goto nla_put_failure;
391 nla_nest_end(skb, nest_parms);
392
393 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
394 if (!nest_parms)
395 goto nla_put_failure;
396 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
397 goto nla_put_failure;
398 nla_nest_end(skb, nest_parms);
399
400 if (nf_ct_zone(ct))
401 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
402
403 if (ctnetlink_dump_status(skb, ct) < 0 ||
404 ctnetlink_dump_timeout(skb, ct) < 0 ||
405 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
406 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
407 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
408 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
409 ctnetlink_dump_mark(skb, ct) < 0 ||
410 ctnetlink_dump_secctx(skb, ct) < 0 ||
411 ctnetlink_dump_id(skb, ct) < 0 ||
412 ctnetlink_dump_use(skb, ct) < 0 ||
413 ctnetlink_dump_master(skb, ct) < 0 ||
414 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
415 goto nla_put_failure;
416
417 nlmsg_end(skb, nlh);
418 return skb->len;
419
420nlmsg_failure:
421nla_put_failure:
422 nlmsg_cancel(skb, nlh);
423 return -1;
424}
425
426#ifdef CONFIG_NF_CONNTRACK_EVENTS
427static inline size_t
428ctnetlink_proto_size(const struct nf_conn *ct)
429{
430 struct nf_conntrack_l3proto *l3proto;
431 struct nf_conntrack_l4proto *l4proto;
432 size_t len = 0;
433
434 rcu_read_lock();
435 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
436 len += l3proto->nla_size;
437
438 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
439 len += l4proto->nla_size;
440 rcu_read_unlock();
441
442 return len;
443}
444
445static inline size_t
446ctnetlink_counters_size(const struct nf_conn *ct)
447{
448 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
449 return 0;
450 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
451 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
452 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
453 ;
454}
455
456static inline int
457ctnetlink_secctx_size(const struct nf_conn *ct)
458{
459#ifdef CONFIG_NF_CONNTRACK_SECMARK
460 int len, ret;
461
462 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
463 if (ret)
464 return 0;
465
466 return nla_total_size(0) /* CTA_SECCTX */
467 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
468#else
469 return 0;
470#endif
471}
472
473static inline size_t
474ctnetlink_nlmsg_size(const struct nf_conn *ct)
475{
476 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
477 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
478 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
479 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
480 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
481 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
482 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
483 + ctnetlink_counters_size(ct)
484 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
485 + nla_total_size(0) /* CTA_PROTOINFO */
486 + nla_total_size(0) /* CTA_HELP */
487 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
488 + ctnetlink_secctx_size(ct)
489#ifdef CONFIG_NF_NAT_NEEDED
490 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
491 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
492#endif
493#ifdef CONFIG_NF_CONNTRACK_MARK
494 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
495#endif
496 + ctnetlink_proto_size(ct)
497 ;
498}
499
500static int
501ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
502{
503 struct net *net;
504 struct nlmsghdr *nlh;
505 struct nfgenmsg *nfmsg;
506 struct nlattr *nest_parms;
507 struct nf_conn *ct = item->ct;
508 struct sk_buff *skb;
509 unsigned int type;
510 unsigned int flags = 0, group;
511 int err;
512
513 /* ignore our fake conntrack entry */
514 if (nf_ct_is_untracked(ct))
515 return 0;
516
517 if (events & (1 << IPCT_DESTROY)) {
518 type = IPCTNL_MSG_CT_DELETE;
519 group = NFNLGRP_CONNTRACK_DESTROY;
520 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
521 type = IPCTNL_MSG_CT_NEW;
522 flags = NLM_F_CREATE|NLM_F_EXCL;
523 group = NFNLGRP_CONNTRACK_NEW;
524 } else if (events) {
525 type = IPCTNL_MSG_CT_NEW;
526 group = NFNLGRP_CONNTRACK_UPDATE;
527 } else
528 return 0;
529
530 net = nf_ct_net(ct);
531 if (!item->report && !nfnetlink_has_listeners(net, group))
532 return 0;
533
534 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
535 if (skb == NULL)
536 goto errout;
537
538 type |= NFNL_SUBSYS_CTNETLINK << 8;
539 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
540 if (nlh == NULL)
541 goto nlmsg_failure;
542
543 nfmsg = nlmsg_data(nlh);
544 nfmsg->nfgen_family = nf_ct_l3num(ct);
545 nfmsg->version = NFNETLINK_V0;
546 nfmsg->res_id = 0;
547
548 rcu_read_lock();
549 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
550 if (!nest_parms)
551 goto nla_put_failure;
552 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
553 goto nla_put_failure;
554 nla_nest_end(skb, nest_parms);
555
556 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
557 if (!nest_parms)
558 goto nla_put_failure;
559 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
560 goto nla_put_failure;
561 nla_nest_end(skb, nest_parms);
562
563 if (nf_ct_zone(ct))
564 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
565
566 if (ctnetlink_dump_id(skb, ct) < 0)
567 goto nla_put_failure;
568
569 if (ctnetlink_dump_status(skb, ct) < 0)
570 goto nla_put_failure;
571
572 if (events & (1 << IPCT_DESTROY)) {
573 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
574 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
575 goto nla_put_failure;
576 } else {
577 if (ctnetlink_dump_timeout(skb, ct) < 0)
578 goto nla_put_failure;
579
580 if (events & (1 << IPCT_PROTOINFO)
581 && ctnetlink_dump_protoinfo(skb, ct) < 0)
582 goto nla_put_failure;
583
584 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
585 && ctnetlink_dump_helpinfo(skb, ct) < 0)
586 goto nla_put_failure;
587
588#ifdef CONFIG_NF_CONNTRACK_SECMARK
589 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
590 && ctnetlink_dump_secctx(skb, ct) < 0)
591 goto nla_put_failure;
592#endif
593
594 if (events & (1 << IPCT_RELATED) &&
595 ctnetlink_dump_master(skb, ct) < 0)
596 goto nla_put_failure;
597
598 if (events & (1 << IPCT_NATSEQADJ) &&
599 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
600 goto nla_put_failure;
601 }
602
603#ifdef CONFIG_NF_CONNTRACK_MARK
604 if ((events & (1 << IPCT_MARK) || ct->mark)
605 && ctnetlink_dump_mark(skb, ct) < 0)
606 goto nla_put_failure;
607#endif
608 rcu_read_unlock();
609
610 nlmsg_end(skb, nlh);
611 err = nfnetlink_send(skb, net, item->pid, group, item->report,
612 GFP_ATOMIC);
613 if (err == -ENOBUFS || err == -EAGAIN)
614 return -ENOBUFS;
615
616 return 0;
617
618nla_put_failure:
619 rcu_read_unlock();
620 nlmsg_cancel(skb, nlh);
621nlmsg_failure:
622 kfree_skb(skb);
623errout:
624 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
625 return -ENOBUFS;
626
627 return 0;
628}
629#endif /* CONFIG_NF_CONNTRACK_EVENTS */
630
631static int ctnetlink_done(struct netlink_callback *cb)
632{
633 if (cb->args[1])
634 nf_ct_put((struct nf_conn *)cb->args[1]);
635 return 0;
636}
637
638static int
639ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
640{
641 struct net *net = sock_net(skb->sk);
642 struct nf_conn *ct, *last;
643 struct nf_conntrack_tuple_hash *h;
644 struct hlist_nulls_node *n;
645 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
646 u_int8_t l3proto = nfmsg->nfgen_family;
647
648 rcu_read_lock();
649 last = (struct nf_conn *)cb->args[1];
650 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
651restart:
652 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
653 hnnode) {
654 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
655 continue;
656 ct = nf_ct_tuplehash_to_ctrack(h);
657 if (!atomic_inc_not_zero(&ct->ct_general.use))
658 continue;
659 /* Dump entries of a given L3 protocol number.
660 * If it is not specified, ie. l3proto == 0,
661 * then dump everything. */
662 if (l3proto && nf_ct_l3num(ct) != l3proto)
663 goto releasect;
664 if (cb->args[1]) {
665 if (ct != last)
666 goto releasect;
667 cb->args[1] = 0;
668 }
669 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
670 cb->nlh->nlmsg_seq,
671 IPCTNL_MSG_CT_NEW, ct) < 0) {
672 cb->args[1] = (unsigned long)ct;
673 goto out;
674 }
675
676 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
677 IPCTNL_MSG_CT_GET_CTRZERO) {
678 struct nf_conn_counter *acct;
679
680 acct = nf_conn_acct_find(ct);
681 if (acct)
682 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
683 }
684releasect:
685 nf_ct_put(ct);
686 }
687 if (cb->args[1]) {
688 cb->args[1] = 0;
689 goto restart;
690 }
691 }
692out:
693 rcu_read_unlock();
694 if (last)
695 nf_ct_put(last);
696
697 return skb->len;
698}
699
700static inline int
701ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
702{
703 struct nlattr *tb[CTA_IP_MAX+1];
704 struct nf_conntrack_l3proto *l3proto;
705 int ret = 0;
706
707 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
708
709 rcu_read_lock();
710 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
711
712 if (likely(l3proto->nlattr_to_tuple)) {
713 ret = nla_validate_nested(attr, CTA_IP_MAX,
714 l3proto->nla_policy);
715 if (ret == 0)
716 ret = l3proto->nlattr_to_tuple(tb, tuple);
717 }
718
719 rcu_read_unlock();
720
721 return ret;
722}
723
724static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
725 [CTA_PROTO_NUM] = { .type = NLA_U8 },
726};
727
728static inline int
729ctnetlink_parse_tuple_proto(struct nlattr *attr,
730 struct nf_conntrack_tuple *tuple)
731{
732 struct nlattr *tb[CTA_PROTO_MAX+1];
733 struct nf_conntrack_l4proto *l4proto;
734 int ret = 0;
735
736 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
737 if (ret < 0)
738 return ret;
739
740 if (!tb[CTA_PROTO_NUM])
741 return -EINVAL;
742 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
743
744 rcu_read_lock();
745 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
746
747 if (likely(l4proto->nlattr_to_tuple)) {
748 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
749 l4proto->nla_policy);
750 if (ret == 0)
751 ret = l4proto->nlattr_to_tuple(tb, tuple);
752 }
753
754 rcu_read_unlock();
755
756 return ret;
757}
758
759static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
760 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
761 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
762};
763
764static int
765ctnetlink_parse_tuple(const struct nlattr * const cda[],
766 struct nf_conntrack_tuple *tuple,
767 enum ctattr_tuple type, u_int8_t l3num)
768{
769 struct nlattr *tb[CTA_TUPLE_MAX+1];
770 int err;
771
772 memset(tuple, 0, sizeof(*tuple));
773
774 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
775
776 if (!tb[CTA_TUPLE_IP])
777 return -EINVAL;
778
779 tuple->src.l3num = l3num;
780
781 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
782 if (err < 0)
783 return err;
784
785 if (!tb[CTA_TUPLE_PROTO])
786 return -EINVAL;
787
788 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
789 if (err < 0)
790 return err;
791
792 /* orig and expect tuples get DIR_ORIGINAL */
793 if (type == CTA_TUPLE_REPLY)
794 tuple->dst.dir = IP_CT_DIR_REPLY;
795 else
796 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
797
798 return 0;
799}
800
801static int
802ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
803{
804 if (attr)
805#ifdef CONFIG_NF_CONNTRACK_ZONES
806 *zone = ntohs(nla_get_be16(attr));
807#else
808 return -EOPNOTSUPP;
809#endif
810 else
811 *zone = 0;
812
813 return 0;
814}
815
816static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
817 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
818};
819
820static inline int
821ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
822{
823 struct nlattr *tb[CTA_HELP_MAX+1];
824
825 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
826
827 if (!tb[CTA_HELP_NAME])
828 return -EINVAL;
829
830 *helper_name = nla_data(tb[CTA_HELP_NAME]);
831
832 return 0;
833}
834
835static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
836 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
837 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
838 [CTA_STATUS] = { .type = NLA_U32 },
839 [CTA_PROTOINFO] = { .type = NLA_NESTED },
840 [CTA_HELP] = { .type = NLA_NESTED },
841 [CTA_NAT_SRC] = { .type = NLA_NESTED },
842 [CTA_TIMEOUT] = { .type = NLA_U32 },
843 [CTA_MARK] = { .type = NLA_U32 },
844 [CTA_ID] = { .type = NLA_U32 },
845 [CTA_NAT_DST] = { .type = NLA_NESTED },
846 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
847 [CTA_ZONE] = { .type = NLA_U16 },
848};
849
850static int
851ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
852 const struct nlmsghdr *nlh,
853 const struct nlattr * const cda[])
854{
855 struct net *net = sock_net(ctnl);
856 struct nf_conntrack_tuple_hash *h;
857 struct nf_conntrack_tuple tuple;
858 struct nf_conn *ct;
859 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
860 u_int8_t u3 = nfmsg->nfgen_family;
861 u16 zone;
862 int err;
863
864 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
865 if (err < 0)
866 return err;
867
868 if (cda[CTA_TUPLE_ORIG])
869 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
870 else if (cda[CTA_TUPLE_REPLY])
871 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
872 else {
873 /* Flush the whole table */
874 nf_conntrack_flush_report(net,
875 NETLINK_CB(skb).pid,
876 nlmsg_report(nlh));
877 return 0;
878 }
879
880 if (err < 0)
881 return err;
882
883 h = nf_conntrack_find_get(net, zone, &tuple);
884 if (!h)
885 return -ENOENT;
886
887 ct = nf_ct_tuplehash_to_ctrack(h);
888
889 if (cda[CTA_ID]) {
890 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
891 if (id != (u32)(unsigned long)ct) {
892 nf_ct_put(ct);
893 return -ENOENT;
894 }
895 }
896
897 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
898 NETLINK_CB(skb).pid,
899 nlmsg_report(nlh)) < 0) {
900 nf_ct_delete_from_lists(ct);
901 /* we failed to report the event, try later */
902 nf_ct_insert_dying_list(ct);
903 nf_ct_put(ct);
904 return 0;
905 }
906
907 /* death_by_timeout would report the event again */
908 set_bit(IPS_DYING_BIT, &ct->status);
909
910 nf_ct_kill(ct);
911 nf_ct_put(ct);
912
913 return 0;
914}
915
916static int
917ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
918 const struct nlmsghdr *nlh,
919 const struct nlattr * const cda[])
920{
921 struct net *net = sock_net(ctnl);
922 struct nf_conntrack_tuple_hash *h;
923 struct nf_conntrack_tuple tuple;
924 struct nf_conn *ct;
925 struct sk_buff *skb2 = NULL;
926 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
927 u_int8_t u3 = nfmsg->nfgen_family;
928 u16 zone;
929 int err;
930
931 if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP)
932 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
933 ctnetlink_done);
934
935 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
936 if (err < 0)
937 return err;
938
939 if (cda[CTA_TUPLE_ORIG])
940 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
941 else if (cda[CTA_TUPLE_REPLY])
942 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
943 else
944 return -EINVAL;
945
946 if (err < 0)
947 return err;
948
949 h = nf_conntrack_find_get(net, zone, &tuple);
950 if (!h)
951 return -ENOENT;
952
953 ct = nf_ct_tuplehash_to_ctrack(h);
954
955 err = -ENOMEM;
956 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
957 if (skb2 == NULL) {
958 nf_ct_put(ct);
959 return -ENOMEM;
960 }
961
962 rcu_read_lock();
963 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
964 IPCTNL_MSG_CT_NEW, ct);
965 rcu_read_unlock();
966 nf_ct_put(ct);
967 if (err <= 0)
968 goto free;
969
970 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
971 if (err < 0)
972 goto out;
973
974 return 0;
975
976free:
977 kfree_skb(skb2);
978out:
979 return err;
980}
981
982#ifdef CONFIG_NF_NAT_NEEDED
983static int
984ctnetlink_parse_nat_setup(struct nf_conn *ct,
985 enum nf_nat_manip_type manip,
986 const struct nlattr *attr)
987{
988 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
989
990 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
991 if (!parse_nat_setup) {
992#ifdef CONFIG_MODULES
993 rcu_read_unlock();
994 spin_unlock_bh(&nf_conntrack_lock);
995 nfnl_unlock();
996 if (request_module("nf-nat-ipv4") < 0) {
997 nfnl_lock();
998 spin_lock_bh(&nf_conntrack_lock);
999 rcu_read_lock();
1000 return -EOPNOTSUPP;
1001 }
1002 nfnl_lock();
1003 spin_lock_bh(&nf_conntrack_lock);
1004 rcu_read_lock();
1005 if (nfnetlink_parse_nat_setup_hook)
1006 return -EAGAIN;
1007#endif
1008 return -EOPNOTSUPP;
1009 }
1010
1011 return parse_nat_setup(ct, manip, attr);
1012}
1013#endif
1014
1015static int
1016ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1017{
1018 unsigned long d;
1019 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1020 d = ct->status ^ status;
1021
1022 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1023 /* unchangeable */
1024 return -EBUSY;
1025
1026 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1027 /* SEEN_REPLY bit can only be set */
1028 return -EBUSY;
1029
1030 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1031 /* ASSURED bit can only be set */
1032 return -EBUSY;
1033
1034 /* Be careful here, modifying NAT bits can screw up things,
1035 * so don't let users modify them directly if they don't pass
1036 * nf_nat_range. */
1037 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1038 return 0;
1039}
1040
1041static int
1042ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1043{
1044#ifdef CONFIG_NF_NAT_NEEDED
1045 int ret;
1046
1047 if (cda[CTA_NAT_DST]) {
1048 ret = ctnetlink_parse_nat_setup(ct,
1049 IP_NAT_MANIP_DST,
1050 cda[CTA_NAT_DST]);
1051 if (ret < 0)
1052 return ret;
1053 }
1054 if (cda[CTA_NAT_SRC]) {
1055 ret = ctnetlink_parse_nat_setup(ct,
1056 IP_NAT_MANIP_SRC,
1057 cda[CTA_NAT_SRC]);
1058 if (ret < 0)
1059 return ret;
1060 }
1061 return 0;
1062#else
1063 return -EOPNOTSUPP;
1064#endif
1065}
1066
1067static inline int
1068ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1069{
1070 struct nf_conntrack_helper *helper;
1071 struct nf_conn_help *help = nfct_help(ct);
1072 char *helpname = NULL;
1073 int err;
1074
1075 /* don't change helper of sibling connections */
1076 if (ct->master)
1077 return -EBUSY;
1078
1079 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1080 if (err < 0)
1081 return err;
1082
1083 if (!strcmp(helpname, "")) {
1084 if (help && help->helper) {
1085 /* we had a helper before ... */
1086 nf_ct_remove_expectations(ct);
1087 rcu_assign_pointer(help->helper, NULL);
1088 }
1089
1090 return 0;
1091 }
1092
1093 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1094 nf_ct_protonum(ct));
1095 if (helper == NULL) {
1096#ifdef CONFIG_MODULES
1097 spin_unlock_bh(&nf_conntrack_lock);
1098
1099 if (request_module("nfct-helper-%s", helpname) < 0) {
1100 spin_lock_bh(&nf_conntrack_lock);
1101 return -EOPNOTSUPP;
1102 }
1103
1104 spin_lock_bh(&nf_conntrack_lock);
1105 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1106 nf_ct_protonum(ct));
1107 if (helper)
1108 return -EAGAIN;
1109#endif
1110 return -EOPNOTSUPP;
1111 }
1112
1113 if (help) {
1114 if (help->helper == helper)
1115 return 0;
1116 if (help->helper)
1117 return -EBUSY;
1118 /* need to zero data of old helper */
1119 memset(&help->help, 0, sizeof(help->help));
1120 } else {
1121 /* we cannot set a helper for an existing conntrack */
1122 return -EOPNOTSUPP;
1123 }
1124
1125 rcu_assign_pointer(help->helper, helper);
1126
1127 return 0;
1128}
1129
1130static inline int
1131ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1132{
1133 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1134
1135 if (!del_timer(&ct->timeout))
1136 return -ETIME;
1137
1138 ct->timeout.expires = jiffies + timeout * HZ;
1139 add_timer(&ct->timeout);
1140
1141 return 0;
1142}
1143
1144static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1145 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1146 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1147 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1148};
1149
1150static inline int
1151ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1152{
1153 const struct nlattr *attr = cda[CTA_PROTOINFO];
1154 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1155 struct nf_conntrack_l4proto *l4proto;
1156 int err = 0;
1157
1158 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1159
1160 rcu_read_lock();
1161 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1162 if (l4proto->from_nlattr)
1163 err = l4proto->from_nlattr(tb, ct);
1164 rcu_read_unlock();
1165
1166 return err;
1167}
1168
1169#ifdef CONFIG_NF_NAT_NEEDED
1170static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1171 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1172 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1173 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1174};
1175
1176static inline int
1177change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1178{
1179 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1180
1181 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1182
1183 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1184 return -EINVAL;
1185
1186 natseq->correction_pos =
1187 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1188
1189 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1190 return -EINVAL;
1191
1192 natseq->offset_before =
1193 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1194
1195 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1196 return -EINVAL;
1197
1198 natseq->offset_after =
1199 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1200
1201 return 0;
1202}
1203
1204static int
1205ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1206 const struct nlattr * const cda[])
1207{
1208 int ret = 0;
1209 struct nf_conn_nat *nat = nfct_nat(ct);
1210
1211 if (!nat)
1212 return 0;
1213
1214 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1215 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1216 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1217 if (ret < 0)
1218 return ret;
1219
1220 ct->status |= IPS_SEQ_ADJUST;
1221 }
1222
1223 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1224 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1225 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1226 if (ret < 0)
1227 return ret;
1228
1229 ct->status |= IPS_SEQ_ADJUST;
1230 }
1231
1232 return 0;
1233}
1234#endif
1235
1236static int
1237ctnetlink_change_conntrack(struct nf_conn *ct,
1238 const struct nlattr * const cda[])
1239{
1240 int err;
1241
1242 /* only allow NAT changes and master assignation for new conntracks */
1243 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1244 return -EOPNOTSUPP;
1245
1246 if (cda[CTA_HELP]) {
1247 err = ctnetlink_change_helper(ct, cda);
1248 if (err < 0)
1249 return err;
1250 }
1251
1252 if (cda[CTA_TIMEOUT]) {
1253 err = ctnetlink_change_timeout(ct, cda);
1254 if (err < 0)
1255 return err;
1256 }
1257
1258 if (cda[CTA_STATUS]) {
1259 err = ctnetlink_change_status(ct, cda);
1260 if (err < 0)
1261 return err;
1262 }
1263
1264 if (cda[CTA_PROTOINFO]) {
1265 err = ctnetlink_change_protoinfo(ct, cda);
1266 if (err < 0)
1267 return err;
1268 }
1269
1270#if defined(CONFIG_NF_CONNTRACK_MARK)
1271 if (cda[CTA_MARK])
1272 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1273#endif
1274
1275#ifdef CONFIG_NF_NAT_NEEDED
1276 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1277 err = ctnetlink_change_nat_seq_adj(ct, cda);
1278 if (err < 0)
1279 return err;
1280 }
1281#endif
1282
1283 return 0;
1284}
1285
1286static struct nf_conn *
1287ctnetlink_create_conntrack(struct net *net, u16 zone,
1288 const struct nlattr * const cda[],
1289 struct nf_conntrack_tuple *otuple,
1290 struct nf_conntrack_tuple *rtuple,
1291 u8 u3)
1292{
1293 struct nf_conn *ct;
1294 int err = -EINVAL;
1295 struct nf_conntrack_helper *helper;
1296
1297 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1298 if (IS_ERR(ct))
1299 return ERR_PTR(-ENOMEM);
1300
1301 if (!cda[CTA_TIMEOUT])
1302 goto err1;
1303 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1304
1305 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1306
1307 rcu_read_lock();
1308 if (cda[CTA_HELP]) {
1309 char *helpname = NULL;
1310
1311 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1312 if (err < 0)
1313 goto err2;
1314
1315 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1316 nf_ct_protonum(ct));
1317 if (helper == NULL) {
1318 rcu_read_unlock();
1319#ifdef CONFIG_MODULES
1320 if (request_module("nfct-helper-%s", helpname) < 0) {
1321 err = -EOPNOTSUPP;
1322 goto err1;
1323 }
1324
1325 rcu_read_lock();
1326 helper = __nf_conntrack_helper_find(helpname,
1327 nf_ct_l3num(ct),
1328 nf_ct_protonum(ct));
1329 if (helper) {
1330 err = -EAGAIN;
1331 goto err2;
1332 }
1333 rcu_read_unlock();
1334#endif
1335 err = -EOPNOTSUPP;
1336 goto err1;
1337 } else {
1338 struct nf_conn_help *help;
1339
1340 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1341 if (help == NULL) {
1342 err = -ENOMEM;
1343 goto err2;
1344 }
1345
1346 /* not in hash table yet so not strictly necessary */
1347 rcu_assign_pointer(help->helper, helper);
1348 }
1349 } else {
1350 /* try an implicit helper assignation */
1351 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1352 if (err < 0)
1353 goto err2;
1354 }
1355
1356 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1357 err = ctnetlink_change_nat(ct, cda);
1358 if (err < 0)
1359 goto err2;
1360 }
1361
1362 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1363 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1364 /* we must add conntrack extensions before confirmation. */
1365 ct->status |= IPS_CONFIRMED;
1366
1367 if (cda[CTA_STATUS]) {
1368 err = ctnetlink_change_status(ct, cda);
1369 if (err < 0)
1370 goto err2;
1371 }
1372
1373#ifdef CONFIG_NF_NAT_NEEDED
1374 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1375 err = ctnetlink_change_nat_seq_adj(ct, cda);
1376 if (err < 0)
1377 goto err2;
1378 }
1379#endif
1380
1381 if (cda[CTA_PROTOINFO]) {
1382 err = ctnetlink_change_protoinfo(ct, cda);
1383 if (err < 0)
1384 goto err2;
1385 }
1386
1387#if defined(CONFIG_NF_CONNTRACK_MARK)
1388 if (cda[CTA_MARK])
1389 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1390#endif
1391
1392 /* setup master conntrack: this is a confirmed expectation */
1393 if (cda[CTA_TUPLE_MASTER]) {
1394 struct nf_conntrack_tuple master;
1395 struct nf_conntrack_tuple_hash *master_h;
1396 struct nf_conn *master_ct;
1397
1398 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1399 if (err < 0)
1400 goto err2;
1401
1402 master_h = nf_conntrack_find_get(net, zone, &master);
1403 if (master_h == NULL) {
1404 err = -ENOENT;
1405 goto err2;
1406 }
1407 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1408 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1409 ct->master = master_ct;
1410 }
1411
1412 add_timer(&ct->timeout);
1413 nf_conntrack_hash_insert(ct);
1414 rcu_read_unlock();
1415
1416 return ct;
1417
1418err2:
1419 rcu_read_unlock();
1420err1:
1421 nf_conntrack_free(ct);
1422 return ERR_PTR(err);
1423}
1424
1425static int
1426ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1427 const struct nlmsghdr *nlh,
1428 const struct nlattr * const cda[])
1429{
1430 struct net *net = sock_net(ctnl);
1431 struct nf_conntrack_tuple otuple, rtuple;
1432 struct nf_conntrack_tuple_hash *h = NULL;
1433 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1434 u_int8_t u3 = nfmsg->nfgen_family;
1435 u16 zone;
1436 int err;
1437
1438 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1439 if (err < 0)
1440 return err;
1441
1442 if (cda[CTA_TUPLE_ORIG]) {
1443 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1444 if (err < 0)
1445 return err;
1446 }
1447
1448 if (cda[CTA_TUPLE_REPLY]) {
1449 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1450 if (err < 0)
1451 return err;
1452 }
1453
1454 spin_lock_bh(&nf_conntrack_lock);
1455 if (cda[CTA_TUPLE_ORIG])
1456 h = __nf_conntrack_find(net, zone, &otuple);
1457 else if (cda[CTA_TUPLE_REPLY])
1458 h = __nf_conntrack_find(net, zone, &rtuple);
1459
1460 if (h == NULL) {
1461 err = -ENOENT;
1462 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1463 struct nf_conn *ct;
1464 enum ip_conntrack_events events;
1465
1466 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1467 &rtuple, u3);
1468 if (IS_ERR(ct)) {
1469 err = PTR_ERR(ct);
1470 goto out_unlock;
1471 }
1472 err = 0;
1473 nf_conntrack_get(&ct->ct_general);
1474 spin_unlock_bh(&nf_conntrack_lock);
1475 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1476 events = IPCT_RELATED;
1477 else
1478 events = IPCT_NEW;
1479
1480 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1481 (1 << IPCT_ASSURED) |
1482 (1 << IPCT_HELPER) |
1483 (1 << IPCT_PROTOINFO) |
1484 (1 << IPCT_NATSEQADJ) |
1485 (1 << IPCT_MARK) | events,
1486 ct, NETLINK_CB(skb).pid,
1487 nlmsg_report(nlh));
1488 nf_ct_put(ct);
1489 } else
1490 spin_unlock_bh(&nf_conntrack_lock);
1491
1492 return err;
1493 }
1494 /* implicit 'else' */
1495
1496 /* We manipulate the conntrack inside the global conntrack table lock,
1497 * so there's no need to increase the refcount */
1498 err = -EEXIST;
1499 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1500 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1501
1502 err = ctnetlink_change_conntrack(ct, cda);
1503 if (err == 0) {
1504 nf_conntrack_get(&ct->ct_general);
1505 spin_unlock_bh(&nf_conntrack_lock);
1506 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1507 (1 << IPCT_ASSURED) |
1508 (1 << IPCT_HELPER) |
1509 (1 << IPCT_PROTOINFO) |
1510 (1 << IPCT_NATSEQADJ) |
1511 (1 << IPCT_MARK),
1512 ct, NETLINK_CB(skb).pid,
1513 nlmsg_report(nlh));
1514 nf_ct_put(ct);
1515 } else
1516 spin_unlock_bh(&nf_conntrack_lock);
1517
1518 return err;
1519 }
1520
1521out_unlock:
1522 spin_unlock_bh(&nf_conntrack_lock);
1523 return err;
1524}
1525
1526/***********************************************************************
1527 * EXPECT
1528 ***********************************************************************/
1529
1530static inline int
1531ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1532 const struct nf_conntrack_tuple *tuple,
1533 enum ctattr_expect type)
1534{
1535 struct nlattr *nest_parms;
1536
1537 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1538 if (!nest_parms)
1539 goto nla_put_failure;
1540 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1541 goto nla_put_failure;
1542 nla_nest_end(skb, nest_parms);
1543
1544 return 0;
1545
1546nla_put_failure:
1547 return -1;
1548}
1549
1550static inline int
1551ctnetlink_exp_dump_mask(struct sk_buff *skb,
1552 const struct nf_conntrack_tuple *tuple,
1553 const struct nf_conntrack_tuple_mask *mask)
1554{
1555 int ret;
1556 struct nf_conntrack_l3proto *l3proto;
1557 struct nf_conntrack_l4proto *l4proto;
1558 struct nf_conntrack_tuple m;
1559 struct nlattr *nest_parms;
1560
1561 memset(&m, 0xFF, sizeof(m));
1562 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1563 m.src.u.all = mask->src.u.all;
1564 m.dst.protonum = tuple->dst.protonum;
1565
1566 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1567 if (!nest_parms)
1568 goto nla_put_failure;
1569
1570 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1571 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1572
1573 if (unlikely(ret < 0))
1574 goto nla_put_failure;
1575
1576 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1577 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1578 if (unlikely(ret < 0))
1579 goto nla_put_failure;
1580
1581 nla_nest_end(skb, nest_parms);
1582
1583 return 0;
1584
1585nla_put_failure:
1586 return -1;
1587}
1588
1589static int
1590ctnetlink_exp_dump_expect(struct sk_buff *skb,
1591 const struct nf_conntrack_expect *exp)
1592{
1593 struct nf_conn *master = exp->master;
1594 long timeout = (exp->timeout.expires - jiffies) / HZ;
1595 struct nf_conn_help *help;
1596
1597 if (timeout < 0)
1598 timeout = 0;
1599
1600 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1601 goto nla_put_failure;
1602 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1603 goto nla_put_failure;
1604 if (ctnetlink_exp_dump_tuple(skb,
1605 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1606 CTA_EXPECT_MASTER) < 0)
1607 goto nla_put_failure;
1608
1609 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1610 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1611 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1612 help = nfct_help(master);
1613 if (help) {
1614 struct nf_conntrack_helper *helper;
1615
1616 helper = rcu_dereference(help->helper);
1617 if (helper)
1618 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1619 }
1620
1621 return 0;
1622
1623nla_put_failure:
1624 return -1;
1625}
1626
1627static int
1628ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1629 int event, const struct nf_conntrack_expect *exp)
1630{
1631 struct nlmsghdr *nlh;
1632 struct nfgenmsg *nfmsg;
1633 unsigned int flags = pid ? NLM_F_MULTI : 0;
1634
1635 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1636 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1637 if (nlh == NULL)
1638 goto nlmsg_failure;
1639
1640 nfmsg = nlmsg_data(nlh);
1641 nfmsg->nfgen_family = exp->tuple.src.l3num;
1642 nfmsg->version = NFNETLINK_V0;
1643 nfmsg->res_id = 0;
1644
1645 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1646 goto nla_put_failure;
1647
1648 nlmsg_end(skb, nlh);
1649 return skb->len;
1650
1651nlmsg_failure:
1652nla_put_failure:
1653 nlmsg_cancel(skb, nlh);
1654 return -1;
1655}
1656
1657#ifdef CONFIG_NF_CONNTRACK_EVENTS
1658static int
1659ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1660{
1661 struct nf_conntrack_expect *exp = item->exp;
1662 struct net *net = nf_ct_exp_net(exp);
1663 struct nlmsghdr *nlh;
1664 struct nfgenmsg *nfmsg;
1665 struct sk_buff *skb;
1666 unsigned int type, group;
1667 int flags = 0;
1668
1669 if (events & (1 << IPEXP_DESTROY)) {
1670 type = IPCTNL_MSG_EXP_DELETE;
1671 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1672 } else if (events & (1 << IPEXP_NEW)) {
1673 type = IPCTNL_MSG_EXP_NEW;
1674 flags = NLM_F_CREATE|NLM_F_EXCL;
1675 group = NFNLGRP_CONNTRACK_EXP_NEW;
1676 } else
1677 return 0;
1678
1679 if (!item->report && !nfnetlink_has_listeners(net, group))
1680 return 0;
1681
1682 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1683 if (skb == NULL)
1684 goto errout;
1685
1686 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1687 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1688 if (nlh == NULL)
1689 goto nlmsg_failure;
1690
1691 nfmsg = nlmsg_data(nlh);
1692 nfmsg->nfgen_family = exp->tuple.src.l3num;
1693 nfmsg->version = NFNETLINK_V0;
1694 nfmsg->res_id = 0;
1695
1696 rcu_read_lock();
1697 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1698 goto nla_put_failure;
1699 rcu_read_unlock();
1700
1701 nlmsg_end(skb, nlh);
1702 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1703 return 0;
1704
1705nla_put_failure:
1706 rcu_read_unlock();
1707 nlmsg_cancel(skb, nlh);
1708nlmsg_failure:
1709 kfree_skb(skb);
1710errout:
1711 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1712 return 0;
1713}
1714#endif
1715static int ctnetlink_exp_done(struct netlink_callback *cb)
1716{
1717 if (cb->args[1])
1718 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1719 return 0;
1720}
1721
1722static int
1723ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1724{
1725 struct net *net = sock_net(skb->sk);
1726 struct nf_conntrack_expect *exp, *last;
1727 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1728 struct hlist_node *n;
1729 u_int8_t l3proto = nfmsg->nfgen_family;
1730
1731 rcu_read_lock();
1732 last = (struct nf_conntrack_expect *)cb->args[1];
1733 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1734restart:
1735 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1736 hnode) {
1737 if (l3proto && exp->tuple.src.l3num != l3proto)
1738 continue;
1739 if (cb->args[1]) {
1740 if (exp != last)
1741 continue;
1742 cb->args[1] = 0;
1743 }
1744 if (ctnetlink_exp_fill_info(skb,
1745 NETLINK_CB(cb->skb).pid,
1746 cb->nlh->nlmsg_seq,
1747 IPCTNL_MSG_EXP_NEW,
1748 exp) < 0) {
1749 if (!atomic_inc_not_zero(&exp->use))
1750 continue;
1751 cb->args[1] = (unsigned long)exp;
1752 goto out;
1753 }
1754 }
1755 if (cb->args[1]) {
1756 cb->args[1] = 0;
1757 goto restart;
1758 }
1759 }
1760out:
1761 rcu_read_unlock();
1762 if (last)
1763 nf_ct_expect_put(last);
1764
1765 return skb->len;
1766}
1767
1768static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1769 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1770 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1771 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1772 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1773 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1774 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1775 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1776 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1777};
1778
1779static int
1780ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1781 const struct nlmsghdr *nlh,
1782 const struct nlattr * const cda[])
1783{
1784 struct net *net = sock_net(ctnl);
1785 struct nf_conntrack_tuple tuple;
1786 struct nf_conntrack_expect *exp;
1787 struct sk_buff *skb2;
1788 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1789 u_int8_t u3 = nfmsg->nfgen_family;
1790 u16 zone;
1791 int err;
1792
1793 if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
1794 return netlink_dump_start(ctnl, skb, nlh,
1795 ctnetlink_exp_dump_table,
1796 ctnetlink_exp_done);
1797 }
1798
1799 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1800 if (err < 0)
1801 return err;
1802
1803 if (cda[CTA_EXPECT_MASTER])
1804 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1805 else
1806 return -EINVAL;
1807
1808 if (err < 0)
1809 return err;
1810
1811 exp = nf_ct_expect_find_get(net, zone, &tuple);
1812 if (!exp)
1813 return -ENOENT;
1814
1815 if (cda[CTA_EXPECT_ID]) {
1816 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1817 if (ntohl(id) != (u32)(unsigned long)exp) {
1818 nf_ct_expect_put(exp);
1819 return -ENOENT;
1820 }
1821 }
1822
1823 err = -ENOMEM;
1824 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1825 if (skb2 == NULL)
1826 goto out;
1827
1828 rcu_read_lock();
1829 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1830 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1831 rcu_read_unlock();
1832 if (err <= 0)
1833 goto free;
1834
1835 nf_ct_expect_put(exp);
1836
1837 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1838
1839free:
1840 kfree_skb(skb2);
1841out:
1842 nf_ct_expect_put(exp);
1843 return err;
1844}
1845
1846static int
1847ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1848 const struct nlmsghdr *nlh,
1849 const struct nlattr * const cda[])
1850{
1851 struct net *net = sock_net(ctnl);
1852 struct nf_conntrack_expect *exp;
1853 struct nf_conntrack_tuple tuple;
1854 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1855 struct hlist_node *n, *next;
1856 u_int8_t u3 = nfmsg->nfgen_family;
1857 unsigned int i;
1858 u16 zone;
1859 int err;
1860
1861 if (cda[CTA_EXPECT_TUPLE]) {
1862 /* delete a single expect by tuple */
1863 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1864 if (err < 0)
1865 return err;
1866
1867 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1868 if (err < 0)
1869 return err;
1870
1871 /* bump usage count to 2 */
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 /* after list removal, usage count == 1 */
1885 spin_lock_bh(&nf_conntrack_lock);
1886 if (del_timer(&exp->timeout)) {
1887 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1888 nlmsg_report(nlh));
1889 nf_ct_expect_put(exp);
1890 }
1891 spin_unlock_bh(&nf_conntrack_lock);
1892 /* have to put what we 'get' above.
1893 * after this line usage count == 0 */
1894 nf_ct_expect_put(exp);
1895 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1896 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1897 struct nf_conn_help *m_help;
1898
1899 /* delete all expectations for this helper */
1900 spin_lock_bh(&nf_conntrack_lock);
1901 for (i = 0; i < nf_ct_expect_hsize; i++) {
1902 hlist_for_each_entry_safe(exp, n, next,
1903 &net->ct.expect_hash[i],
1904 hnode) {
1905 m_help = nfct_help(exp->master);
1906 if (!strcmp(m_help->helper->name, name) &&
1907 del_timer(&exp->timeout)) {
1908 nf_ct_unlink_expect_report(exp,
1909 NETLINK_CB(skb).pid,
1910 nlmsg_report(nlh));
1911 nf_ct_expect_put(exp);
1912 }
1913 }
1914 }
1915 spin_unlock_bh(&nf_conntrack_lock);
1916 } else {
1917 /* This basically means we have to flush everything*/
1918 spin_lock_bh(&nf_conntrack_lock);
1919 for (i = 0; i < nf_ct_expect_hsize; i++) {
1920 hlist_for_each_entry_safe(exp, n, next,
1921 &net->ct.expect_hash[i],
1922 hnode) {
1923 if (del_timer(&exp->timeout)) {
1924 nf_ct_unlink_expect_report(exp,
1925 NETLINK_CB(skb).pid,
1926 nlmsg_report(nlh));
1927 nf_ct_expect_put(exp);
1928 }
1929 }
1930 }
1931 spin_unlock_bh(&nf_conntrack_lock);
1932 }
1933
1934 return 0;
1935}
1936static int
1937ctnetlink_change_expect(struct nf_conntrack_expect *x,
1938 const struct nlattr * const cda[])
1939{
1940 return -EOPNOTSUPP;
1941}
1942
1943static int
1944ctnetlink_create_expect(struct net *net, u16 zone,
1945 const struct nlattr * const cda[],
1946 u_int8_t u3,
1947 u32 pid, int report)
1948{
1949 struct nf_conntrack_tuple tuple, mask, master_tuple;
1950 struct nf_conntrack_tuple_hash *h = NULL;
1951 struct nf_conntrack_expect *exp;
1952 struct nf_conn *ct;
1953 struct nf_conn_help *help;
1954 int err = 0;
1955
1956 /* caller guarantees that those three CTA_EXPECT_* exist */
1957 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1958 if (err < 0)
1959 return err;
1960 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1961 if (err < 0)
1962 return err;
1963 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1964 if (err < 0)
1965 return err;
1966
1967 /* Look for master conntrack of this expectation */
1968 h = nf_conntrack_find_get(net, zone, &master_tuple);
1969 if (!h)
1970 return -ENOENT;
1971 ct = nf_ct_tuplehash_to_ctrack(h);
1972 exp = nf_ct_expect_alloc(ct);
1973 if (!exp) {
1974 err = -ENOMEM;
1975 goto out;
1976 }
1977 help = nfct_help(ct);
1978 if (!help) {
1979 if (!cda[CTA_EXPECT_TIMEOUT]) {
1980 err = -EINVAL;
1981 goto out;
1982 }
1983 exp->timeout.expires =
1984 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
1985
1986 exp->flags = NF_CT_EXPECT_USERSPACE;
1987 if (cda[CTA_EXPECT_FLAGS]) {
1988 exp->flags |=
1989 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1990 }
1991 } else {
1992 if (cda[CTA_EXPECT_FLAGS]) {
1993 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1994 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
1995 } else
1996 exp->flags = 0;
1997 }
1998
1999 exp->class = 0;
2000 exp->expectfn = NULL;
2001 exp->master = ct;
2002 exp->helper = NULL;
2003 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2004 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2005 exp->mask.src.u.all = mask.src.u.all;
2006
2007 err = nf_ct_expect_related_report(exp, pid, report);
2008 nf_ct_expect_put(exp);
2009
2010out:
2011 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2012 return err;
2013}
2014
2015static int
2016ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2017 const struct nlmsghdr *nlh,
2018 const struct nlattr * const cda[])
2019{
2020 struct net *net = sock_net(ctnl);
2021 struct nf_conntrack_tuple tuple;
2022 struct nf_conntrack_expect *exp;
2023 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2024 u_int8_t u3 = nfmsg->nfgen_family;
2025 u16 zone;
2026 int err;
2027
2028 if (!cda[CTA_EXPECT_TUPLE]
2029 || !cda[CTA_EXPECT_MASK]
2030 || !cda[CTA_EXPECT_MASTER])
2031 return -EINVAL;
2032
2033 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2034 if (err < 0)
2035 return err;
2036
2037 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2038 if (err < 0)
2039 return err;
2040
2041 spin_lock_bh(&nf_conntrack_lock);
2042 exp = __nf_ct_expect_find(net, zone, &tuple);
2043
2044 if (!exp) {
2045 spin_unlock_bh(&nf_conntrack_lock);
2046 err = -ENOENT;
2047 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2048 err = ctnetlink_create_expect(net, zone, cda,
2049 u3,
2050 NETLINK_CB(skb).pid,
2051 nlmsg_report(nlh));
2052 }
2053 return err;
2054 }
2055
2056 err = -EEXIST;
2057 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2058 err = ctnetlink_change_expect(exp, cda);
2059 spin_unlock_bh(&nf_conntrack_lock);
2060
2061 return err;
2062}
2063
2064#ifdef CONFIG_NF_CONNTRACK_EVENTS
2065static struct nf_ct_event_notifier ctnl_notifier = {
2066 .fcn = ctnetlink_conntrack_event,
2067};
2068
2069static struct nf_exp_event_notifier ctnl_notifier_exp = {
2070 .fcn = ctnetlink_expect_event,
2071};
2072#endif
2073
2074static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2075 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2076 .attr_count = CTA_MAX,
2077 .policy = ct_nla_policy },
2078 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2079 .attr_count = CTA_MAX,
2080 .policy = ct_nla_policy },
2081 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2082 .attr_count = CTA_MAX,
2083 .policy = ct_nla_policy },
2084 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2085 .attr_count = CTA_MAX,
2086 .policy = ct_nla_policy },
2087};
2088
2089static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2090 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2091 .attr_count = CTA_EXPECT_MAX,
2092 .policy = exp_nla_policy },
2093 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2094 .attr_count = CTA_EXPECT_MAX,
2095 .policy = exp_nla_policy },
2096 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2097 .attr_count = CTA_EXPECT_MAX,
2098 .policy = exp_nla_policy },
2099};
2100
2101static const struct nfnetlink_subsystem ctnl_subsys = {
2102 .name = "conntrack",
2103 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2104 .cb_count = IPCTNL_MSG_MAX,
2105 .cb = ctnl_cb,
2106};
2107
2108static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2109 .name = "conntrack_expect",
2110 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2111 .cb_count = IPCTNL_MSG_EXP_MAX,
2112 .cb = ctnl_exp_cb,
2113};
2114
2115MODULE_ALIAS("ip_conntrack_netlink");
2116MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2117MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2118
2119static int __init ctnetlink_init(void)
2120{
2121 int ret;
2122
2123 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2124 ret = nfnetlink_subsys_register(&ctnl_subsys);
2125 if (ret < 0) {
2126 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2127 goto err_out;
2128 }
2129
2130 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2131 if (ret < 0) {
2132 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2133 goto err_unreg_subsys;
2134 }
2135
2136#ifdef CONFIG_NF_CONNTRACK_EVENTS
2137 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2138 if (ret < 0) {
2139 pr_err("ctnetlink_init: cannot register notifier.\n");
2140 goto err_unreg_exp_subsys;
2141 }
2142
2143 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2144 if (ret < 0) {
2145 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2146 goto err_unreg_notifier;
2147 }
2148#endif
2149
2150 return 0;
2151
2152#ifdef CONFIG_NF_CONNTRACK_EVENTS
2153err_unreg_notifier:
2154 nf_conntrack_unregister_notifier(&ctnl_notifier);
2155err_unreg_exp_subsys:
2156 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2157#endif
2158err_unreg_subsys:
2159 nfnetlink_subsys_unregister(&ctnl_subsys);
2160err_out:
2161 return ret;
2162}
2163
2164static void __exit ctnetlink_exit(void)
2165{
2166 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2167
2168 nf_ct_remove_userspace_expectations();
2169#ifdef CONFIG_NF_CONNTRACK_EVENTS
2170 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2171 nf_conntrack_unregister_notifier(&ctnl_notifier);
2172#endif
2173
2174 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2175 nfnetlink_subsys_unregister(&ctnl_subsys);
2176}
2177
2178module_init(ctnetlink_init);
2179module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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