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powerpc/mm: Add SMP support to no-hash TLB handling
[deliverable/linux.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/types.h>
23 #include <linux/timer.h>
24 #include <linux/skbuff.h>
25 #include <linux/errno.h>
26 #include <linux/netlink.h>
27 #include <linux/spinlock.h>
28 #include <linux/interrupt.h>
29 #include <linux/notifier.h>
30
31 #include <linux/netfilter.h>
32 #include <net/netlink.h>
33 #include <net/netfilter/nf_conntrack.h>
34 #include <net/netfilter/nf_conntrack_core.h>
35 #include <net/netfilter/nf_conntrack_expect.h>
36 #include <net/netfilter/nf_conntrack_helper.h>
37 #include <net/netfilter/nf_conntrack_l3proto.h>
38 #include <net/netfilter/nf_conntrack_l4proto.h>
39 #include <net/netfilter/nf_conntrack_tuple.h>
40 #include <net/netfilter/nf_conntrack_acct.h>
41 #ifdef CONFIG_NF_NAT_NEEDED
42 #include <net/netfilter/nf_nat_core.h>
43 #include <net/netfilter/nf_nat_protocol.h>
44 #endif
45
46 #include <linux/netfilter/nfnetlink.h>
47 #include <linux/netfilter/nfnetlink_conntrack.h>
48
49 MODULE_LICENSE("GPL");
50
51 static char __initdata version[] = "0.93";
52
53 static inline int
54 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
55 const struct nf_conntrack_tuple *tuple,
56 struct nf_conntrack_l4proto *l4proto)
57 {
58 int ret = 0;
59 struct nlattr *nest_parms;
60
61 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
62 if (!nest_parms)
63 goto nla_put_failure;
64 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
65
66 if (likely(l4proto->tuple_to_nlattr))
67 ret = l4proto->tuple_to_nlattr(skb, tuple);
68
69 nla_nest_end(skb, nest_parms);
70
71 return ret;
72
73 nla_put_failure:
74 return -1;
75 }
76
77 static inline int
78 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
79 const struct nf_conntrack_tuple *tuple,
80 struct nf_conntrack_l3proto *l3proto)
81 {
82 int ret = 0;
83 struct nlattr *nest_parms;
84
85 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
86 if (!nest_parms)
87 goto nla_put_failure;
88
89 if (likely(l3proto->tuple_to_nlattr))
90 ret = l3proto->tuple_to_nlattr(skb, tuple);
91
92 nla_nest_end(skb, nest_parms);
93
94 return ret;
95
96 nla_put_failure:
97 return -1;
98 }
99
100 static int
101 ctnetlink_dump_tuples(struct sk_buff *skb,
102 const struct nf_conntrack_tuple *tuple)
103 {
104 int ret;
105 struct nf_conntrack_l3proto *l3proto;
106 struct nf_conntrack_l4proto *l4proto;
107
108 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
109 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
110 nf_ct_l3proto_put(l3proto);
111
112 if (unlikely(ret < 0))
113 return ret;
114
115 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
116 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
117 nf_ct_l4proto_put(l4proto);
118
119 return ret;
120 }
121
122 static inline int
123 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
124 {
125 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
126 return 0;
127
128 nla_put_failure:
129 return -1;
130 }
131
132 static inline int
133 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
134 {
135 long timeout = (ct->timeout.expires - jiffies) / HZ;
136
137 if (timeout < 0)
138 timeout = 0;
139
140 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
141 return 0;
142
143 nla_put_failure:
144 return -1;
145 }
146
147 static inline int
148 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
149 {
150 struct nf_conntrack_l4proto *l4proto;
151 struct nlattr *nest_proto;
152 int ret;
153
154 l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
155 if (!l4proto->to_nlattr) {
156 nf_ct_l4proto_put(l4proto);
157 return 0;
158 }
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 nf_ct_l4proto_put(l4proto);
167
168 nla_nest_end(skb, nest_proto);
169
170 return ret;
171
172 nla_put_failure:
173 nf_ct_l4proto_put(l4proto);
174 return -1;
175 }
176
177 static inline int
178 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
179 {
180 struct nlattr *nest_helper;
181 const struct nf_conn_help *help = nfct_help(ct);
182 struct nf_conntrack_helper *helper;
183
184 if (!help)
185 return 0;
186
187 rcu_read_lock();
188 helper = rcu_dereference(help->helper);
189 if (!helper)
190 goto out;
191
192 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
193 if (!nest_helper)
194 goto nla_put_failure;
195 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
196
197 if (helper->to_nlattr)
198 helper->to_nlattr(skb, ct);
199
200 nla_nest_end(skb, nest_helper);
201 out:
202 rcu_read_unlock();
203 return 0;
204
205 nla_put_failure:
206 rcu_read_unlock();
207 return -1;
208 }
209
210 static int
211 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
212 enum ip_conntrack_dir dir)
213 {
214 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
215 struct nlattr *nest_count;
216 const struct nf_conn_counter *acct;
217
218 acct = nf_conn_acct_find(ct);
219 if (!acct)
220 return 0;
221
222 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
223 if (!nest_count)
224 goto nla_put_failure;
225
226 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
227 cpu_to_be64(acct[dir].packets));
228 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
229 cpu_to_be64(acct[dir].bytes));
230
231 nla_nest_end(skb, nest_count);
232
233 return 0;
234
235 nla_put_failure:
236 return -1;
237 }
238
239 #ifdef CONFIG_NF_CONNTRACK_MARK
240 static inline int
241 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
242 {
243 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
244 return 0;
245
246 nla_put_failure:
247 return -1;
248 }
249 #else
250 #define ctnetlink_dump_mark(a, b) (0)
251 #endif
252
253 #ifdef CONFIG_NF_CONNTRACK_SECMARK
254 static inline int
255 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
256 {
257 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
258 return 0;
259
260 nla_put_failure:
261 return -1;
262 }
263 #else
264 #define ctnetlink_dump_secmark(a, b) (0)
265 #endif
266
267 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
268
269 static inline int
270 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
271 {
272 struct nlattr *nest_parms;
273
274 if (!(ct->status & IPS_EXPECTED))
275 return 0;
276
277 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
278 if (!nest_parms)
279 goto nla_put_failure;
280 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
281 goto nla_put_failure;
282 nla_nest_end(skb, nest_parms);
283
284 return 0;
285
286 nla_put_failure:
287 return -1;
288 }
289
290 #ifdef CONFIG_NF_NAT_NEEDED
291 static int
292 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
293 {
294 struct nlattr *nest_parms;
295
296 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
297 if (!nest_parms)
298 goto nla_put_failure;
299
300 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
301 htonl(natseq->correction_pos));
302 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
303 htonl(natseq->offset_before));
304 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
305 htonl(natseq->offset_after));
306
307 nla_nest_end(skb, nest_parms);
308
309 return 0;
310
311 nla_put_failure:
312 return -1;
313 }
314
315 static inline int
316 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
317 {
318 struct nf_nat_seq *natseq;
319 struct nf_conn_nat *nat = nfct_nat(ct);
320
321 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
322 return 0;
323
324 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
325 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
326 return -1;
327
328 natseq = &nat->seq[IP_CT_DIR_REPLY];
329 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
330 return -1;
331
332 return 0;
333 }
334 #else
335 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
336 #endif
337
338 static inline int
339 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
340 {
341 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
342 return 0;
343
344 nla_put_failure:
345 return -1;
346 }
347
348 static inline int
349 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
350 {
351 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
352 return 0;
353
354 nla_put_failure:
355 return -1;
356 }
357
358 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
359
360 static int
361 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
362 int event, int nowait,
363 const struct nf_conn *ct)
364 {
365 struct nlmsghdr *nlh;
366 struct nfgenmsg *nfmsg;
367 struct nlattr *nest_parms;
368 unsigned char *b = skb_tail_pointer(skb);
369
370 event |= NFNL_SUBSYS_CTNETLINK << 8;
371 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
372 nfmsg = NLMSG_DATA(nlh);
373
374 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
375 nfmsg->nfgen_family = nf_ct_l3num(ct);
376 nfmsg->version = NFNETLINK_V0;
377 nfmsg->res_id = 0;
378
379 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
380 if (!nest_parms)
381 goto nla_put_failure;
382 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
383 goto nla_put_failure;
384 nla_nest_end(skb, nest_parms);
385
386 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
387 if (!nest_parms)
388 goto nla_put_failure;
389 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
390 goto nla_put_failure;
391 nla_nest_end(skb, nest_parms);
392
393 if (ctnetlink_dump_status(skb, ct) < 0 ||
394 ctnetlink_dump_timeout(skb, ct) < 0 ||
395 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
396 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
397 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
398 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
399 ctnetlink_dump_mark(skb, ct) < 0 ||
400 ctnetlink_dump_secmark(skb, ct) < 0 ||
401 ctnetlink_dump_id(skb, ct) < 0 ||
402 ctnetlink_dump_use(skb, ct) < 0 ||
403 ctnetlink_dump_master(skb, ct) < 0 ||
404 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
405 goto nla_put_failure;
406
407 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
408 return skb->len;
409
410 nlmsg_failure:
411 nla_put_failure:
412 nlmsg_trim(skb, b);
413 return -1;
414 }
415
416 #ifdef CONFIG_NF_CONNTRACK_EVENTS
417 static int ctnetlink_conntrack_event(struct notifier_block *this,
418 unsigned long events, void *ptr)
419 {
420 struct nlmsghdr *nlh;
421 struct nfgenmsg *nfmsg;
422 struct nlattr *nest_parms;
423 struct nf_conn *ct = (struct nf_conn *)ptr;
424 struct sk_buff *skb;
425 unsigned int type;
426 sk_buff_data_t b;
427 unsigned int flags = 0, group;
428
429 /* ignore our fake conntrack entry */
430 if (ct == &nf_conntrack_untracked)
431 return NOTIFY_DONE;
432
433 if (events & IPCT_DESTROY) {
434 type = IPCTNL_MSG_CT_DELETE;
435 group = NFNLGRP_CONNTRACK_DESTROY;
436 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
437 type = IPCTNL_MSG_CT_NEW;
438 flags = NLM_F_CREATE|NLM_F_EXCL;
439 group = NFNLGRP_CONNTRACK_NEW;
440 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
441 type = IPCTNL_MSG_CT_NEW;
442 group = NFNLGRP_CONNTRACK_UPDATE;
443 } else
444 return NOTIFY_DONE;
445
446 if (!nfnetlink_has_listeners(group))
447 return NOTIFY_DONE;
448
449 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
450 if (!skb)
451 return NOTIFY_DONE;
452
453 b = skb->tail;
454
455 type |= NFNL_SUBSYS_CTNETLINK << 8;
456 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
457 nfmsg = NLMSG_DATA(nlh);
458
459 nlh->nlmsg_flags = flags;
460 nfmsg->nfgen_family = nf_ct_l3num(ct);
461 nfmsg->version = NFNETLINK_V0;
462 nfmsg->res_id = 0;
463
464 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
465 if (!nest_parms)
466 goto nla_put_failure;
467 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
468 goto nla_put_failure;
469 nla_nest_end(skb, nest_parms);
470
471 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
472 if (!nest_parms)
473 goto nla_put_failure;
474 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
475 goto nla_put_failure;
476 nla_nest_end(skb, nest_parms);
477
478 if (ctnetlink_dump_id(skb, ct) < 0)
479 goto nla_put_failure;
480
481 if (ctnetlink_dump_status(skb, ct) < 0)
482 goto nla_put_failure;
483
484 if (events & IPCT_DESTROY) {
485 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
486 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
487 goto nla_put_failure;
488 } else {
489 if (ctnetlink_dump_timeout(skb, ct) < 0)
490 goto nla_put_failure;
491
492 if (events & IPCT_PROTOINFO
493 && ctnetlink_dump_protoinfo(skb, ct) < 0)
494 goto nla_put_failure;
495
496 if ((events & IPCT_HELPER || nfct_help(ct))
497 && ctnetlink_dump_helpinfo(skb, ct) < 0)
498 goto nla_put_failure;
499
500 #ifdef CONFIG_NF_CONNTRACK_SECMARK
501 if ((events & IPCT_SECMARK || ct->secmark)
502 && ctnetlink_dump_secmark(skb, ct) < 0)
503 goto nla_put_failure;
504 #endif
505
506 if (events & IPCT_RELATED &&
507 ctnetlink_dump_master(skb, ct) < 0)
508 goto nla_put_failure;
509
510 if (events & IPCT_NATSEQADJ &&
511 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
512 goto nla_put_failure;
513 }
514
515 #ifdef CONFIG_NF_CONNTRACK_MARK
516 if ((events & IPCT_MARK || ct->mark)
517 && ctnetlink_dump_mark(skb, ct) < 0)
518 goto nla_put_failure;
519 #endif
520
521 nlh->nlmsg_len = skb->tail - b;
522 nfnetlink_send(skb, 0, group, 0);
523 return NOTIFY_DONE;
524
525 nlmsg_failure:
526 nla_put_failure:
527 kfree_skb(skb);
528 return NOTIFY_DONE;
529 }
530 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
531
532 static int ctnetlink_done(struct netlink_callback *cb)
533 {
534 if (cb->args[1])
535 nf_ct_put((struct nf_conn *)cb->args[1]);
536 return 0;
537 }
538
539 static int
540 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
541 {
542 struct nf_conn *ct, *last;
543 struct nf_conntrack_tuple_hash *h;
544 struct hlist_node *n;
545 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
546 u_int8_t l3proto = nfmsg->nfgen_family;
547
548 rcu_read_lock();
549 last = (struct nf_conn *)cb->args[1];
550 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
551 restart:
552 hlist_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
553 hnode) {
554 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
555 continue;
556 ct = nf_ct_tuplehash_to_ctrack(h);
557 /* Dump entries of a given L3 protocol number.
558 * If it is not specified, ie. l3proto == 0,
559 * then dump everything. */
560 if (l3proto && nf_ct_l3num(ct) != l3proto)
561 continue;
562 if (cb->args[1]) {
563 if (ct != last)
564 continue;
565 cb->args[1] = 0;
566 }
567 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
568 cb->nlh->nlmsg_seq,
569 IPCTNL_MSG_CT_NEW,
570 1, ct) < 0) {
571 if (!atomic_inc_not_zero(&ct->ct_general.use))
572 continue;
573 cb->args[1] = (unsigned long)ct;
574 goto out;
575 }
576
577 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
578 IPCTNL_MSG_CT_GET_CTRZERO) {
579 struct nf_conn_counter *acct;
580
581 acct = nf_conn_acct_find(ct);
582 if (acct)
583 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
584 }
585 }
586 if (cb->args[1]) {
587 cb->args[1] = 0;
588 goto restart;
589 }
590 }
591 out:
592 rcu_read_unlock();
593 if (last)
594 nf_ct_put(last);
595
596 return skb->len;
597 }
598
599 static inline int
600 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
601 {
602 struct nlattr *tb[CTA_IP_MAX+1];
603 struct nf_conntrack_l3proto *l3proto;
604 int ret = 0;
605
606 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
607
608 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
609
610 if (likely(l3proto->nlattr_to_tuple)) {
611 ret = nla_validate_nested(attr, CTA_IP_MAX,
612 l3proto->nla_policy);
613 if (ret == 0)
614 ret = l3proto->nlattr_to_tuple(tb, tuple);
615 }
616
617 nf_ct_l3proto_put(l3proto);
618
619 return ret;
620 }
621
622 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
623 [CTA_PROTO_NUM] = { .type = NLA_U8 },
624 };
625
626 static inline int
627 ctnetlink_parse_tuple_proto(struct nlattr *attr,
628 struct nf_conntrack_tuple *tuple)
629 {
630 struct nlattr *tb[CTA_PROTO_MAX+1];
631 struct nf_conntrack_l4proto *l4proto;
632 int ret = 0;
633
634 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
635 if (ret < 0)
636 return ret;
637
638 if (!tb[CTA_PROTO_NUM])
639 return -EINVAL;
640 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
641
642 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
643
644 if (likely(l4proto->nlattr_to_tuple)) {
645 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
646 l4proto->nla_policy);
647 if (ret == 0)
648 ret = l4proto->nlattr_to_tuple(tb, tuple);
649 }
650
651 nf_ct_l4proto_put(l4proto);
652
653 return ret;
654 }
655
656 static int
657 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
658 enum ctattr_tuple type, u_int8_t l3num)
659 {
660 struct nlattr *tb[CTA_TUPLE_MAX+1];
661 int err;
662
663 memset(tuple, 0, sizeof(*tuple));
664
665 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
666
667 if (!tb[CTA_TUPLE_IP])
668 return -EINVAL;
669
670 tuple->src.l3num = l3num;
671
672 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
673 if (err < 0)
674 return err;
675
676 if (!tb[CTA_TUPLE_PROTO])
677 return -EINVAL;
678
679 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
680 if (err < 0)
681 return err;
682
683 /* orig and expect tuples get DIR_ORIGINAL */
684 if (type == CTA_TUPLE_REPLY)
685 tuple->dst.dir = IP_CT_DIR_REPLY;
686 else
687 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
688
689 return 0;
690 }
691
692 static inline int
693 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
694 {
695 struct nlattr *tb[CTA_HELP_MAX+1];
696
697 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
698
699 if (!tb[CTA_HELP_NAME])
700 return -EINVAL;
701
702 *helper_name = nla_data(tb[CTA_HELP_NAME]);
703
704 return 0;
705 }
706
707 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
708 [CTA_STATUS] = { .type = NLA_U32 },
709 [CTA_TIMEOUT] = { .type = NLA_U32 },
710 [CTA_MARK] = { .type = NLA_U32 },
711 [CTA_USE] = { .type = NLA_U32 },
712 [CTA_ID] = { .type = NLA_U32 },
713 };
714
715 static int
716 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
717 struct nlmsghdr *nlh, struct nlattr *cda[])
718 {
719 struct nf_conntrack_tuple_hash *h;
720 struct nf_conntrack_tuple tuple;
721 struct nf_conn *ct;
722 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
723 u_int8_t u3 = nfmsg->nfgen_family;
724 int err = 0;
725
726 if (cda[CTA_TUPLE_ORIG])
727 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
728 else if (cda[CTA_TUPLE_REPLY])
729 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
730 else {
731 /* Flush the whole table */
732 nf_conntrack_flush(&init_net);
733 return 0;
734 }
735
736 if (err < 0)
737 return err;
738
739 h = nf_conntrack_find_get(&init_net, &tuple);
740 if (!h)
741 return -ENOENT;
742
743 ct = nf_ct_tuplehash_to_ctrack(h);
744
745 if (cda[CTA_ID]) {
746 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
747 if (id != (u32)(unsigned long)ct) {
748 nf_ct_put(ct);
749 return -ENOENT;
750 }
751 }
752
753 nf_ct_kill(ct);
754 nf_ct_put(ct);
755
756 return 0;
757 }
758
759 static int
760 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
761 struct nlmsghdr *nlh, struct nlattr *cda[])
762 {
763 struct nf_conntrack_tuple_hash *h;
764 struct nf_conntrack_tuple tuple;
765 struct nf_conn *ct;
766 struct sk_buff *skb2 = NULL;
767 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
768 u_int8_t u3 = nfmsg->nfgen_family;
769 int err = 0;
770
771 if (nlh->nlmsg_flags & NLM_F_DUMP)
772 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
773 ctnetlink_done);
774
775 if (cda[CTA_TUPLE_ORIG])
776 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
777 else if (cda[CTA_TUPLE_REPLY])
778 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
779 else
780 return -EINVAL;
781
782 if (err < 0)
783 return err;
784
785 h = nf_conntrack_find_get(&init_net, &tuple);
786 if (!h)
787 return -ENOENT;
788
789 ct = nf_ct_tuplehash_to_ctrack(h);
790
791 err = -ENOMEM;
792 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
793 if (!skb2) {
794 nf_ct_put(ct);
795 return -ENOMEM;
796 }
797
798 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
799 IPCTNL_MSG_CT_NEW, 1, ct);
800 nf_ct_put(ct);
801 if (err <= 0)
802 goto free;
803
804 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
805 if (err < 0)
806 goto out;
807
808 return 0;
809
810 free:
811 kfree_skb(skb2);
812 out:
813 return err;
814 }
815
816 #ifdef CONFIG_NF_NAT_NEEDED
817 static int
818 ctnetlink_parse_nat_setup(struct nf_conn *ct,
819 enum nf_nat_manip_type manip,
820 struct nlattr *attr)
821 {
822 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
823
824 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
825 if (!parse_nat_setup) {
826 #ifdef CONFIG_MODULES
827 rcu_read_unlock();
828 nfnl_unlock();
829 if (request_module("nf-nat-ipv4") < 0) {
830 nfnl_lock();
831 rcu_read_lock();
832 return -EOPNOTSUPP;
833 }
834 nfnl_lock();
835 rcu_read_lock();
836 if (nfnetlink_parse_nat_setup_hook)
837 return -EAGAIN;
838 #endif
839 return -EOPNOTSUPP;
840 }
841
842 return parse_nat_setup(ct, manip, attr);
843 }
844 #endif
845
846 static int
847 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
848 {
849 unsigned long d;
850 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
851 d = ct->status ^ status;
852
853 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
854 /* unchangeable */
855 return -EBUSY;
856
857 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
858 /* SEEN_REPLY bit can only be set */
859 return -EBUSY;
860
861 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
862 /* ASSURED bit can only be set */
863 return -EBUSY;
864
865 /* Be careful here, modifying NAT bits can screw up things,
866 * so don't let users modify them directly if they don't pass
867 * nf_nat_range. */
868 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
869 return 0;
870 }
871
872 static int
873 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
874 {
875 #ifdef CONFIG_NF_NAT_NEEDED
876 int ret;
877
878 if (cda[CTA_NAT_DST]) {
879 ret = ctnetlink_parse_nat_setup(ct,
880 IP_NAT_MANIP_DST,
881 cda[CTA_NAT_DST]);
882 if (ret < 0)
883 return ret;
884 }
885 if (cda[CTA_NAT_SRC]) {
886 ret = ctnetlink_parse_nat_setup(ct,
887 IP_NAT_MANIP_SRC,
888 cda[CTA_NAT_SRC]);
889 if (ret < 0)
890 return ret;
891 }
892 return 0;
893 #else
894 return -EOPNOTSUPP;
895 #endif
896 }
897
898 static inline int
899 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
900 {
901 struct nf_conntrack_helper *helper;
902 struct nf_conn_help *help = nfct_help(ct);
903 char *helpname;
904 int err;
905
906 /* don't change helper of sibling connections */
907 if (ct->master)
908 return -EBUSY;
909
910 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
911 if (err < 0)
912 return err;
913
914 if (!strcmp(helpname, "")) {
915 if (help && help->helper) {
916 /* we had a helper before ... */
917 nf_ct_remove_expectations(ct);
918 rcu_assign_pointer(help->helper, NULL);
919 }
920
921 return 0;
922 }
923
924 helper = __nf_conntrack_helper_find_byname(helpname);
925 if (helper == NULL)
926 return -EOPNOTSUPP;
927
928 if (help) {
929 if (help->helper == helper)
930 return 0;
931 if (help->helper)
932 return -EBUSY;
933 /* need to zero data of old helper */
934 memset(&help->help, 0, sizeof(help->help));
935 } else {
936 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
937 if (help == NULL)
938 return -ENOMEM;
939 }
940
941 rcu_assign_pointer(help->helper, helper);
942
943 return 0;
944 }
945
946 static inline int
947 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
948 {
949 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
950
951 if (!del_timer(&ct->timeout))
952 return -ETIME;
953
954 ct->timeout.expires = jiffies + timeout * HZ;
955 add_timer(&ct->timeout);
956
957 return 0;
958 }
959
960 static inline int
961 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
962 {
963 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
964 struct nf_conntrack_l4proto *l4proto;
965 int err = 0;
966
967 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
968
969 l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
970 if (l4proto->from_nlattr)
971 err = l4proto->from_nlattr(tb, ct);
972 nf_ct_l4proto_put(l4proto);
973
974 return err;
975 }
976
977 #ifdef CONFIG_NF_NAT_NEEDED
978 static inline int
979 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
980 {
981 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
982
983 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
984
985 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
986 return -EINVAL;
987
988 natseq->correction_pos =
989 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
990
991 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
992 return -EINVAL;
993
994 natseq->offset_before =
995 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
996
997 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
998 return -EINVAL;
999
1000 natseq->offset_after =
1001 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1002
1003 return 0;
1004 }
1005
1006 static int
1007 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1008 {
1009 int ret = 0;
1010 struct nf_conn_nat *nat = nfct_nat(ct);
1011
1012 if (!nat)
1013 return 0;
1014
1015 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1016 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1017 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1018 if (ret < 0)
1019 return ret;
1020
1021 ct->status |= IPS_SEQ_ADJUST;
1022 }
1023
1024 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1025 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1026 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1027 if (ret < 0)
1028 return ret;
1029
1030 ct->status |= IPS_SEQ_ADJUST;
1031 }
1032
1033 return 0;
1034 }
1035 #endif
1036
1037 static int
1038 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1039 {
1040 int err;
1041
1042 if (cda[CTA_HELP]) {
1043 err = ctnetlink_change_helper(ct, cda);
1044 if (err < 0)
1045 return err;
1046 }
1047
1048 if (cda[CTA_TIMEOUT]) {
1049 err = ctnetlink_change_timeout(ct, cda);
1050 if (err < 0)
1051 return err;
1052 }
1053
1054 if (cda[CTA_STATUS]) {
1055 err = ctnetlink_change_status(ct, cda);
1056 if (err < 0)
1057 return err;
1058 }
1059
1060 if (cda[CTA_PROTOINFO]) {
1061 err = ctnetlink_change_protoinfo(ct, cda);
1062 if (err < 0)
1063 return err;
1064 }
1065
1066 #if defined(CONFIG_NF_CONNTRACK_MARK)
1067 if (cda[CTA_MARK])
1068 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1069 #endif
1070
1071 #ifdef CONFIG_NF_NAT_NEEDED
1072 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1073 err = ctnetlink_change_nat_seq_adj(ct, cda);
1074 if (err < 0)
1075 return err;
1076 }
1077 #endif
1078
1079 return 0;
1080 }
1081
1082 static int
1083 ctnetlink_create_conntrack(struct nlattr *cda[],
1084 struct nf_conntrack_tuple *otuple,
1085 struct nf_conntrack_tuple *rtuple,
1086 struct nf_conn *master_ct)
1087 {
1088 struct nf_conn *ct;
1089 int err = -EINVAL;
1090 struct nf_conn_help *help;
1091 struct nf_conntrack_helper *helper;
1092
1093 ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1094 if (ct == NULL || IS_ERR(ct))
1095 return -ENOMEM;
1096
1097 if (!cda[CTA_TIMEOUT])
1098 goto err;
1099 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1100
1101 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1102 ct->status |= IPS_CONFIRMED;
1103
1104 rcu_read_lock();
1105 helper = __nf_ct_helper_find(rtuple);
1106 if (helper) {
1107 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1108 if (help == NULL) {
1109 rcu_read_unlock();
1110 err = -ENOMEM;
1111 goto err;
1112 }
1113 /* not in hash table yet so not strictly necessary */
1114 rcu_assign_pointer(help->helper, helper);
1115 }
1116
1117 if (cda[CTA_STATUS]) {
1118 err = ctnetlink_change_status(ct, cda);
1119 if (err < 0) {
1120 rcu_read_unlock();
1121 goto err;
1122 }
1123 }
1124
1125 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1126 err = ctnetlink_change_nat(ct, cda);
1127 if (err < 0) {
1128 rcu_read_unlock();
1129 goto err;
1130 }
1131 }
1132
1133 if (cda[CTA_PROTOINFO]) {
1134 err = ctnetlink_change_protoinfo(ct, cda);
1135 if (err < 0) {
1136 rcu_read_unlock();
1137 goto err;
1138 }
1139 }
1140
1141 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1142
1143 #if defined(CONFIG_NF_CONNTRACK_MARK)
1144 if (cda[CTA_MARK])
1145 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1146 #endif
1147
1148 /* setup master conntrack: this is a confirmed expectation */
1149 if (master_ct) {
1150 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1151 ct->master = master_ct;
1152 }
1153
1154 add_timer(&ct->timeout);
1155 nf_conntrack_hash_insert(ct);
1156 rcu_read_unlock();
1157
1158 return 0;
1159
1160 err:
1161 nf_conntrack_free(ct);
1162 return err;
1163 }
1164
1165 static int
1166 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1167 struct nlmsghdr *nlh, struct nlattr *cda[])
1168 {
1169 struct nf_conntrack_tuple otuple, rtuple;
1170 struct nf_conntrack_tuple_hash *h = NULL;
1171 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1172 u_int8_t u3 = nfmsg->nfgen_family;
1173 int err = 0;
1174
1175 if (cda[CTA_TUPLE_ORIG]) {
1176 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1177 if (err < 0)
1178 return err;
1179 }
1180
1181 if (cda[CTA_TUPLE_REPLY]) {
1182 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1183 if (err < 0)
1184 return err;
1185 }
1186
1187 spin_lock_bh(&nf_conntrack_lock);
1188 if (cda[CTA_TUPLE_ORIG])
1189 h = __nf_conntrack_find(&init_net, &otuple);
1190 else if (cda[CTA_TUPLE_REPLY])
1191 h = __nf_conntrack_find(&init_net, &rtuple);
1192
1193 if (h == NULL) {
1194 struct nf_conntrack_tuple master;
1195 struct nf_conntrack_tuple_hash *master_h = NULL;
1196 struct nf_conn *master_ct = NULL;
1197
1198 if (cda[CTA_TUPLE_MASTER]) {
1199 err = ctnetlink_parse_tuple(cda,
1200 &master,
1201 CTA_TUPLE_MASTER,
1202 u3);
1203 if (err < 0)
1204 goto out_unlock;
1205
1206 master_h = __nf_conntrack_find(&init_net, &master);
1207 if (master_h == NULL) {
1208 err = -ENOENT;
1209 goto out_unlock;
1210 }
1211 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1212 atomic_inc(&master_ct->ct_general.use);
1213 }
1214
1215 err = -ENOENT;
1216 if (nlh->nlmsg_flags & NLM_F_CREATE)
1217 err = ctnetlink_create_conntrack(cda,
1218 &otuple,
1219 &rtuple,
1220 master_ct);
1221 spin_unlock_bh(&nf_conntrack_lock);
1222
1223 if (err < 0 && master_ct)
1224 nf_ct_put(master_ct);
1225
1226 return err;
1227 }
1228 /* implicit 'else' */
1229
1230 /* We manipulate the conntrack inside the global conntrack table lock,
1231 * so there's no need to increase the refcount */
1232 err = -EEXIST;
1233 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1234 /* we only allow nat config for new conntracks */
1235 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1236 err = -EOPNOTSUPP;
1237 goto out_unlock;
1238 }
1239 /* can't link an existing conntrack to a master */
1240 if (cda[CTA_TUPLE_MASTER]) {
1241 err = -EOPNOTSUPP;
1242 goto out_unlock;
1243 }
1244 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1245 cda);
1246 }
1247
1248 out_unlock:
1249 spin_unlock_bh(&nf_conntrack_lock);
1250 return err;
1251 }
1252
1253 /***********************************************************************
1254 * EXPECT
1255 ***********************************************************************/
1256
1257 static inline int
1258 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1259 const struct nf_conntrack_tuple *tuple,
1260 enum ctattr_expect type)
1261 {
1262 struct nlattr *nest_parms;
1263
1264 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1265 if (!nest_parms)
1266 goto nla_put_failure;
1267 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1268 goto nla_put_failure;
1269 nla_nest_end(skb, nest_parms);
1270
1271 return 0;
1272
1273 nla_put_failure:
1274 return -1;
1275 }
1276
1277 static inline int
1278 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1279 const struct nf_conntrack_tuple *tuple,
1280 const struct nf_conntrack_tuple_mask *mask)
1281 {
1282 int ret;
1283 struct nf_conntrack_l3proto *l3proto;
1284 struct nf_conntrack_l4proto *l4proto;
1285 struct nf_conntrack_tuple m;
1286 struct nlattr *nest_parms;
1287
1288 memset(&m, 0xFF, sizeof(m));
1289 m.src.u.all = mask->src.u.all;
1290 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1291
1292 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1293 if (!nest_parms)
1294 goto nla_put_failure;
1295
1296 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1297 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1298 nf_ct_l3proto_put(l3proto);
1299
1300 if (unlikely(ret < 0))
1301 goto nla_put_failure;
1302
1303 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1304 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1305 nf_ct_l4proto_put(l4proto);
1306 if (unlikely(ret < 0))
1307 goto nla_put_failure;
1308
1309 nla_nest_end(skb, nest_parms);
1310
1311 return 0;
1312
1313 nla_put_failure:
1314 return -1;
1315 }
1316
1317 static int
1318 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1319 const struct nf_conntrack_expect *exp)
1320 {
1321 struct nf_conn *master = exp->master;
1322 long timeout = (exp->timeout.expires - jiffies) / HZ;
1323
1324 if (timeout < 0)
1325 timeout = 0;
1326
1327 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1328 goto nla_put_failure;
1329 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1330 goto nla_put_failure;
1331 if (ctnetlink_exp_dump_tuple(skb,
1332 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1333 CTA_EXPECT_MASTER) < 0)
1334 goto nla_put_failure;
1335
1336 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1337 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1338
1339 return 0;
1340
1341 nla_put_failure:
1342 return -1;
1343 }
1344
1345 static int
1346 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1347 int event,
1348 int nowait,
1349 const struct nf_conntrack_expect *exp)
1350 {
1351 struct nlmsghdr *nlh;
1352 struct nfgenmsg *nfmsg;
1353 unsigned char *b = skb_tail_pointer(skb);
1354
1355 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1356 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1357 nfmsg = NLMSG_DATA(nlh);
1358
1359 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1360 nfmsg->nfgen_family = exp->tuple.src.l3num;
1361 nfmsg->version = NFNETLINK_V0;
1362 nfmsg->res_id = 0;
1363
1364 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1365 goto nla_put_failure;
1366
1367 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1368 return skb->len;
1369
1370 nlmsg_failure:
1371 nla_put_failure:
1372 nlmsg_trim(skb, b);
1373 return -1;
1374 }
1375
1376 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1377 static int ctnetlink_expect_event(struct notifier_block *this,
1378 unsigned long events, void *ptr)
1379 {
1380 struct nlmsghdr *nlh;
1381 struct nfgenmsg *nfmsg;
1382 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1383 struct sk_buff *skb;
1384 unsigned int type;
1385 sk_buff_data_t b;
1386 int flags = 0;
1387
1388 if (events & IPEXP_NEW) {
1389 type = IPCTNL_MSG_EXP_NEW;
1390 flags = NLM_F_CREATE|NLM_F_EXCL;
1391 } else
1392 return NOTIFY_DONE;
1393
1394 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1395 return NOTIFY_DONE;
1396
1397 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1398 if (!skb)
1399 return NOTIFY_DONE;
1400
1401 b = skb->tail;
1402
1403 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1404 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1405 nfmsg = NLMSG_DATA(nlh);
1406
1407 nlh->nlmsg_flags = flags;
1408 nfmsg->nfgen_family = exp->tuple.src.l3num;
1409 nfmsg->version = NFNETLINK_V0;
1410 nfmsg->res_id = 0;
1411
1412 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1413 goto nla_put_failure;
1414
1415 nlh->nlmsg_len = skb->tail - b;
1416 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1417 return NOTIFY_DONE;
1418
1419 nlmsg_failure:
1420 nla_put_failure:
1421 kfree_skb(skb);
1422 return NOTIFY_DONE;
1423 }
1424 #endif
1425 static int ctnetlink_exp_done(struct netlink_callback *cb)
1426 {
1427 if (cb->args[1])
1428 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1429 return 0;
1430 }
1431
1432 static int
1433 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1434 {
1435 struct net *net = &init_net;
1436 struct nf_conntrack_expect *exp, *last;
1437 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1438 struct hlist_node *n;
1439 u_int8_t l3proto = nfmsg->nfgen_family;
1440
1441 rcu_read_lock();
1442 last = (struct nf_conntrack_expect *)cb->args[1];
1443 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1444 restart:
1445 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1446 hnode) {
1447 if (l3proto && exp->tuple.src.l3num != l3proto)
1448 continue;
1449 if (cb->args[1]) {
1450 if (exp != last)
1451 continue;
1452 cb->args[1] = 0;
1453 }
1454 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1455 cb->nlh->nlmsg_seq,
1456 IPCTNL_MSG_EXP_NEW,
1457 1, exp) < 0) {
1458 if (!atomic_inc_not_zero(&exp->use))
1459 continue;
1460 cb->args[1] = (unsigned long)exp;
1461 goto out;
1462 }
1463 }
1464 if (cb->args[1]) {
1465 cb->args[1] = 0;
1466 goto restart;
1467 }
1468 }
1469 out:
1470 rcu_read_unlock();
1471 if (last)
1472 nf_ct_expect_put(last);
1473
1474 return skb->len;
1475 }
1476
1477 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1478 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1479 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1480 };
1481
1482 static int
1483 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1484 struct nlmsghdr *nlh, struct nlattr *cda[])
1485 {
1486 struct nf_conntrack_tuple tuple;
1487 struct nf_conntrack_expect *exp;
1488 struct sk_buff *skb2;
1489 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1490 u_int8_t u3 = nfmsg->nfgen_family;
1491 int err = 0;
1492
1493 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1494 return netlink_dump_start(ctnl, skb, nlh,
1495 ctnetlink_exp_dump_table,
1496 ctnetlink_exp_done);
1497 }
1498
1499 if (cda[CTA_EXPECT_MASTER])
1500 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1501 else
1502 return -EINVAL;
1503
1504 if (err < 0)
1505 return err;
1506
1507 exp = nf_ct_expect_find_get(&init_net, &tuple);
1508 if (!exp)
1509 return -ENOENT;
1510
1511 if (cda[CTA_EXPECT_ID]) {
1512 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1513 if (ntohl(id) != (u32)(unsigned long)exp) {
1514 nf_ct_expect_put(exp);
1515 return -ENOENT;
1516 }
1517 }
1518
1519 err = -ENOMEM;
1520 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1521 if (!skb2)
1522 goto out;
1523
1524 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1525 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1526 1, exp);
1527 if (err <= 0)
1528 goto free;
1529
1530 nf_ct_expect_put(exp);
1531
1532 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1533
1534 free:
1535 kfree_skb(skb2);
1536 out:
1537 nf_ct_expect_put(exp);
1538 return err;
1539 }
1540
1541 static int
1542 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1543 struct nlmsghdr *nlh, struct nlattr *cda[])
1544 {
1545 struct nf_conntrack_expect *exp;
1546 struct nf_conntrack_tuple tuple;
1547 struct nf_conntrack_helper *h;
1548 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1549 struct hlist_node *n, *next;
1550 u_int8_t u3 = nfmsg->nfgen_family;
1551 unsigned int i;
1552 int err;
1553
1554 if (cda[CTA_EXPECT_TUPLE]) {
1555 /* delete a single expect by tuple */
1556 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1557 if (err < 0)
1558 return err;
1559
1560 /* bump usage count to 2 */
1561 exp = nf_ct_expect_find_get(&init_net, &tuple);
1562 if (!exp)
1563 return -ENOENT;
1564
1565 if (cda[CTA_EXPECT_ID]) {
1566 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1567 if (ntohl(id) != (u32)(unsigned long)exp) {
1568 nf_ct_expect_put(exp);
1569 return -ENOENT;
1570 }
1571 }
1572
1573 /* after list removal, usage count == 1 */
1574 nf_ct_unexpect_related(exp);
1575 /* have to put what we 'get' above.
1576 * after this line usage count == 0 */
1577 nf_ct_expect_put(exp);
1578 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1579 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1580 struct nf_conn_help *m_help;
1581
1582 /* delete all expectations for this helper */
1583 spin_lock_bh(&nf_conntrack_lock);
1584 h = __nf_conntrack_helper_find_byname(name);
1585 if (!h) {
1586 spin_unlock_bh(&nf_conntrack_lock);
1587 return -EOPNOTSUPP;
1588 }
1589 for (i = 0; i < nf_ct_expect_hsize; i++) {
1590 hlist_for_each_entry_safe(exp, n, next,
1591 &init_net.ct.expect_hash[i],
1592 hnode) {
1593 m_help = nfct_help(exp->master);
1594 if (m_help->helper == h
1595 && del_timer(&exp->timeout)) {
1596 nf_ct_unlink_expect(exp);
1597 nf_ct_expect_put(exp);
1598 }
1599 }
1600 }
1601 spin_unlock_bh(&nf_conntrack_lock);
1602 } else {
1603 /* This basically means we have to flush everything*/
1604 spin_lock_bh(&nf_conntrack_lock);
1605 for (i = 0; i < nf_ct_expect_hsize; i++) {
1606 hlist_for_each_entry_safe(exp, n, next,
1607 &init_net.ct.expect_hash[i],
1608 hnode) {
1609 if (del_timer(&exp->timeout)) {
1610 nf_ct_unlink_expect(exp);
1611 nf_ct_expect_put(exp);
1612 }
1613 }
1614 }
1615 spin_unlock_bh(&nf_conntrack_lock);
1616 }
1617
1618 return 0;
1619 }
1620 static int
1621 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1622 {
1623 return -EOPNOTSUPP;
1624 }
1625
1626 static int
1627 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1628 {
1629 struct nf_conntrack_tuple tuple, mask, master_tuple;
1630 struct nf_conntrack_tuple_hash *h = NULL;
1631 struct nf_conntrack_expect *exp;
1632 struct nf_conn *ct;
1633 struct nf_conn_help *help;
1634 int err = 0;
1635
1636 /* caller guarantees that those three CTA_EXPECT_* exist */
1637 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1638 if (err < 0)
1639 return err;
1640 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1641 if (err < 0)
1642 return err;
1643 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1644 if (err < 0)
1645 return err;
1646
1647 /* Look for master conntrack of this expectation */
1648 h = nf_conntrack_find_get(&init_net, &master_tuple);
1649 if (!h)
1650 return -ENOENT;
1651 ct = nf_ct_tuplehash_to_ctrack(h);
1652 help = nfct_help(ct);
1653
1654 if (!help || !help->helper) {
1655 /* such conntrack hasn't got any helper, abort */
1656 err = -EINVAL;
1657 goto out;
1658 }
1659
1660 exp = nf_ct_expect_alloc(ct);
1661 if (!exp) {
1662 err = -ENOMEM;
1663 goto out;
1664 }
1665
1666 exp->expectfn = NULL;
1667 exp->flags = 0;
1668 exp->master = ct;
1669 exp->helper = NULL;
1670 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1671 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1672 exp->mask.src.u.all = mask.src.u.all;
1673
1674 err = nf_ct_expect_related(exp);
1675 nf_ct_expect_put(exp);
1676
1677 out:
1678 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1679 return err;
1680 }
1681
1682 static int
1683 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1684 struct nlmsghdr *nlh, struct nlattr *cda[])
1685 {
1686 struct nf_conntrack_tuple tuple;
1687 struct nf_conntrack_expect *exp;
1688 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1689 u_int8_t u3 = nfmsg->nfgen_family;
1690 int err = 0;
1691
1692 if (!cda[CTA_EXPECT_TUPLE]
1693 || !cda[CTA_EXPECT_MASK]
1694 || !cda[CTA_EXPECT_MASTER])
1695 return -EINVAL;
1696
1697 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1698 if (err < 0)
1699 return err;
1700
1701 spin_lock_bh(&nf_conntrack_lock);
1702 exp = __nf_ct_expect_find(&init_net, &tuple);
1703
1704 if (!exp) {
1705 spin_unlock_bh(&nf_conntrack_lock);
1706 err = -ENOENT;
1707 if (nlh->nlmsg_flags & NLM_F_CREATE)
1708 err = ctnetlink_create_expect(cda, u3);
1709 return err;
1710 }
1711
1712 err = -EEXIST;
1713 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1714 err = ctnetlink_change_expect(exp, cda);
1715 spin_unlock_bh(&nf_conntrack_lock);
1716
1717 return err;
1718 }
1719
1720 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1721 static struct notifier_block ctnl_notifier = {
1722 .notifier_call = ctnetlink_conntrack_event,
1723 };
1724
1725 static struct notifier_block ctnl_notifier_exp = {
1726 .notifier_call = ctnetlink_expect_event,
1727 };
1728 #endif
1729
1730 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1731 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1732 .attr_count = CTA_MAX,
1733 .policy = ct_nla_policy },
1734 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1735 .attr_count = CTA_MAX,
1736 .policy = ct_nla_policy },
1737 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1738 .attr_count = CTA_MAX,
1739 .policy = ct_nla_policy },
1740 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1741 .attr_count = CTA_MAX,
1742 .policy = ct_nla_policy },
1743 };
1744
1745 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1746 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1747 .attr_count = CTA_EXPECT_MAX,
1748 .policy = exp_nla_policy },
1749 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1750 .attr_count = CTA_EXPECT_MAX,
1751 .policy = exp_nla_policy },
1752 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1753 .attr_count = CTA_EXPECT_MAX,
1754 .policy = exp_nla_policy },
1755 };
1756
1757 static const struct nfnetlink_subsystem ctnl_subsys = {
1758 .name = "conntrack",
1759 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1760 .cb_count = IPCTNL_MSG_MAX,
1761 .cb = ctnl_cb,
1762 };
1763
1764 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1765 .name = "conntrack_expect",
1766 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1767 .cb_count = IPCTNL_MSG_EXP_MAX,
1768 .cb = ctnl_exp_cb,
1769 };
1770
1771 MODULE_ALIAS("ip_conntrack_netlink");
1772 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1773 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1774
1775 static int __init ctnetlink_init(void)
1776 {
1777 int ret;
1778
1779 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1780 ret = nfnetlink_subsys_register(&ctnl_subsys);
1781 if (ret < 0) {
1782 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1783 goto err_out;
1784 }
1785
1786 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1787 if (ret < 0) {
1788 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1789 goto err_unreg_subsys;
1790 }
1791
1792 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1793 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1794 if (ret < 0) {
1795 printk("ctnetlink_init: cannot register notifier.\n");
1796 goto err_unreg_exp_subsys;
1797 }
1798
1799 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1800 if (ret < 0) {
1801 printk("ctnetlink_init: cannot expect register notifier.\n");
1802 goto err_unreg_notifier;
1803 }
1804 #endif
1805
1806 return 0;
1807
1808 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1809 err_unreg_notifier:
1810 nf_conntrack_unregister_notifier(&ctnl_notifier);
1811 err_unreg_exp_subsys:
1812 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1813 #endif
1814 err_unreg_subsys:
1815 nfnetlink_subsys_unregister(&ctnl_subsys);
1816 err_out:
1817 return ret;
1818 }
1819
1820 static void __exit ctnetlink_exit(void)
1821 {
1822 printk("ctnetlink: unregistering from nfnetlink.\n");
1823
1824 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1825 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1826 nf_conntrack_unregister_notifier(&ctnl_notifier);
1827 #endif
1828
1829 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1830 nfnetlink_subsys_unregister(&ctnl_subsys);
1831 return;
1832 }
1833
1834 module_init(ctnetlink_init);
1835 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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