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b43: Add debugfs files for MMIO register access
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / netfilter / nf_conntrack_netlink.c
blob63c4e1f299b88d686982cd72e8c7b4565eda961d
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/types.h>
22 #include <linux/timer.h>
23 #include <linux/skbuff.h>
24 #include <linux/errno.h>
25 #include <linux/netlink.h>
26 #include <linux/spinlock.h>
27 #include <linux/interrupt.h>
28 #include <linux/notifier.h>
29
30 #include <linux/netfilter.h>
31 #include <net/netlink.h>
32 #include <net/netfilter/nf_conntrack.h>
33 #include <net/netfilter/nf_conntrack_core.h>
34 #include <net/netfilter/nf_conntrack_expect.h>
35 #include <net/netfilter/nf_conntrack_helper.h>
36 #include <net/netfilter/nf_conntrack_l3proto.h>
37 #include <net/netfilter/nf_conntrack_l4proto.h>
38 #include <net/netfilter/nf_conntrack_tuple.h>
39 #ifdef CONFIG_NF_NAT_NEEDED
40 #include <net/netfilter/nf_nat_core.h>
41 #include <net/netfilter/nf_nat_protocol.h>
42 #endif
43
44 #include <linux/netfilter/nfnetlink.h>
45 #include <linux/netfilter/nfnetlink_conntrack.h>
46
47 MODULE_LICENSE("GPL");
48
49 static char __initdata version[] = "0.93";
50
51 static inline int
52 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
53 const struct nf_conntrack_tuple *tuple,
54 struct nf_conntrack_l4proto *l4proto)
55 {
56 int ret = 0;
57 struct nlattr *nest_parms;
58
59 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
60 if (!nest_parms)
61 goto nla_put_failure;
62 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
63
64 if (likely(l4proto->tuple_to_nlattr))
65 ret = l4proto->tuple_to_nlattr(skb, tuple);
66
67 nla_nest_end(skb, nest_parms);
68
69 return ret;
70
71 nla_put_failure:
72 return -1;
73 }
74
75 static inline int
76 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
77 const struct nf_conntrack_tuple *tuple,
78 struct nf_conntrack_l3proto *l3proto)
79 {
80 int ret = 0;
81 struct nlattr *nest_parms;
82
83 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
84 if (!nest_parms)
85 goto nla_put_failure;
86
87 if (likely(l3proto->tuple_to_nlattr))
88 ret = l3proto->tuple_to_nlattr(skb, tuple);
89
90 nla_nest_end(skb, nest_parms);
91
92 return ret;
93
94 nla_put_failure:
95 return -1;
96 }
97
98 static int
99 ctnetlink_dump_tuples(struct sk_buff *skb,
100 const struct nf_conntrack_tuple *tuple)
101 {
102 int ret;
103 struct nf_conntrack_l3proto *l3proto;
104 struct nf_conntrack_l4proto *l4proto;
105
106 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
107 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
108 nf_ct_l3proto_put(l3proto);
109
110 if (unlikely(ret < 0))
111 return ret;
112
113 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
114 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
115 nf_ct_l4proto_put(l4proto);
116
117 return ret;
118 }
119
120 static inline int
121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
122 {
123 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
124 return 0;
125
126 nla_put_failure:
127 return -1;
128 }
129
130 static inline int
131 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
132 {
133 long timeout = (ct->timeout.expires - jiffies) / HZ;
134
135 if (timeout < 0)
136 timeout = 0;
137
138 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
139 return 0;
140
141 nla_put_failure:
142 return -1;
143 }
144
145 static inline int
146 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
147 {
148 struct nf_conntrack_l4proto *l4proto;
149 struct nlattr *nest_proto;
150 int ret;
151
152 l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
153 if (!l4proto->to_nlattr) {
154 nf_ct_l4proto_put(l4proto);
155 return 0;
156 }
157
158 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
159 if (!nest_proto)
160 goto nla_put_failure;
161
162 ret = l4proto->to_nlattr(skb, nest_proto, ct);
163
164 nf_ct_l4proto_put(l4proto);
165
166 nla_nest_end(skb, nest_proto);
167
168 return ret;
169
170 nla_put_failure:
171 nf_ct_l4proto_put(l4proto);
172 return -1;
173 }
174
175 static inline int
176 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
177 {
178 struct nlattr *nest_helper;
179 const struct nf_conn_help *help = nfct_help(ct);
180 struct nf_conntrack_helper *helper;
181
182 if (!help)
183 return 0;
184
185 rcu_read_lock();
186 helper = rcu_dereference(help->helper);
187 if (!helper)
188 goto out;
189
190 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
191 if (!nest_helper)
192 goto nla_put_failure;
193 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
194
195 if (helper->to_nlattr)
196 helper->to_nlattr(skb, ct);
197
198 nla_nest_end(skb, nest_helper);
199 out:
200 rcu_read_unlock();
201 return 0;
202
203 nla_put_failure:
204 rcu_read_unlock();
205 return -1;
206 }
207
208 #ifdef CONFIG_NF_CT_ACCT
209 static int
210 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
211 enum ip_conntrack_dir dir)
212 {
213 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
214 struct nlattr *nest_count;
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_BE32(skb, CTA_COUNTERS32_PACKETS,
221 htonl(ct->counters[dir].packets));
222 NLA_PUT_BE32(skb, CTA_COUNTERS32_BYTES,
223 htonl(ct->counters[dir].bytes));
224
225 nla_nest_end(skb, nest_count);
226
227 return 0;
228
229 nla_put_failure:
230 return -1;
231 }
232 #else
233 #define ctnetlink_dump_counters(a, b, c) (0)
234 #endif
235
236 #ifdef CONFIG_NF_CONNTRACK_MARK
237 static inline int
238 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
239 {
240 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
241 return 0;
242
243 nla_put_failure:
244 return -1;
245 }
246 #else
247 #define ctnetlink_dump_mark(a, b) (0)
248 #endif
249
250 #ifdef CONFIG_NF_CONNTRACK_SECMARK
251 static inline int
252 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
253 {
254 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
255 return 0;
256
257 nla_put_failure:
258 return -1;
259 }
260 #else
261 #define ctnetlink_dump_secmark(a, b) (0)
262 #endif
263
264 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
265
266 static inline int
267 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
268 {
269 struct nlattr *nest_parms;
270
271 if (!(ct->status & IPS_EXPECTED))
272 return 0;
273
274 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
275 if (!nest_parms)
276 goto nla_put_failure;
277 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
278 goto nla_put_failure;
279 nla_nest_end(skb, nest_parms);
280
281 return 0;
282
283 nla_put_failure:
284 return -1;
285 }
286
287 #ifdef CONFIG_NF_NAT_NEEDED
288 static int
289 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
290 {
291 struct nlattr *nest_parms;
292
293 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
294 if (!nest_parms)
295 goto nla_put_failure;
296
297 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
298 htonl(natseq->correction_pos));
299 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
300 htonl(natseq->offset_before));
301 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
302 htonl(natseq->offset_after));
303
304 nla_nest_end(skb, nest_parms);
305
306 return 0;
307
308 nla_put_failure:
309 return -1;
310 }
311
312 static inline int
313 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
314 {
315 struct nf_nat_seq *natseq;
316 struct nf_conn_nat *nat = nfct_nat(ct);
317
318 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
319 return 0;
320
321 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
322 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
323 return -1;
324
325 natseq = &nat->seq[IP_CT_DIR_REPLY];
326 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
327 return -1;
328
329 return 0;
330 }
331 #else
332 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
333 #endif
334
335 static inline int
336 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
337 {
338 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
339 return 0;
340
341 nla_put_failure:
342 return -1;
343 }
344
345 static inline int
346 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
347 {
348 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
349 return 0;
350
351 nla_put_failure:
352 return -1;
353 }
354
355 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
356
357 static int
358 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
359 int event, int nowait,
360 const struct nf_conn *ct)
361 {
362 struct nlmsghdr *nlh;
363 struct nfgenmsg *nfmsg;
364 struct nlattr *nest_parms;
365 unsigned char *b = skb_tail_pointer(skb);
366
367 event |= NFNL_SUBSYS_CTNETLINK << 8;
368 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
369 nfmsg = NLMSG_DATA(nlh);
370
371 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
372 nfmsg->nfgen_family = nf_ct_l3num(ct);
373 nfmsg->version = NFNETLINK_V0;
374 nfmsg->res_id = 0;
375
376 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
377 if (!nest_parms)
378 goto nla_put_failure;
379 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
380 goto nla_put_failure;
381 nla_nest_end(skb, nest_parms);
382
383 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
384 if (!nest_parms)
385 goto nla_put_failure;
386 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
387 goto nla_put_failure;
388 nla_nest_end(skb, nest_parms);
389
390 if (ctnetlink_dump_status(skb, ct) < 0 ||
391 ctnetlink_dump_timeout(skb, ct) < 0 ||
392 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
393 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
394 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
395 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
396 ctnetlink_dump_mark(skb, ct) < 0 ||
397 ctnetlink_dump_secmark(skb, ct) < 0 ||
398 ctnetlink_dump_id(skb, ct) < 0 ||
399 ctnetlink_dump_use(skb, ct) < 0 ||
400 ctnetlink_dump_master(skb, ct) < 0 ||
401 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
402 goto nla_put_failure;
403
404 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
405 return skb->len;
406
407 nlmsg_failure:
408 nla_put_failure:
409 nlmsg_trim(skb, b);
410 return -1;
411 }
412
413 #ifdef CONFIG_NF_CONNTRACK_EVENTS
414 static int ctnetlink_conntrack_event(struct notifier_block *this,
415 unsigned long events, void *ptr)
416 {
417 struct nlmsghdr *nlh;
418 struct nfgenmsg *nfmsg;
419 struct nlattr *nest_parms;
420 struct nf_conn *ct = (struct nf_conn *)ptr;
421 struct sk_buff *skb;
422 unsigned int type;
423 sk_buff_data_t b;
424 unsigned int flags = 0, group;
425
426 /* ignore our fake conntrack entry */
427 if (ct == &nf_conntrack_untracked)
428 return NOTIFY_DONE;
429
430 if (events & IPCT_DESTROY) {
431 type = IPCTNL_MSG_CT_DELETE;
432 group = NFNLGRP_CONNTRACK_DESTROY;
433 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
434 type = IPCTNL_MSG_CT_NEW;
435 flags = NLM_F_CREATE|NLM_F_EXCL;
436 group = NFNLGRP_CONNTRACK_NEW;
437 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
438 type = IPCTNL_MSG_CT_NEW;
439 group = NFNLGRP_CONNTRACK_UPDATE;
440 } else
441 return NOTIFY_DONE;
442
443 if (!nfnetlink_has_listeners(group))
444 return NOTIFY_DONE;
445
446 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
447 if (!skb)
448 return NOTIFY_DONE;
449
450 b = skb->tail;
451
452 type |= NFNL_SUBSYS_CTNETLINK << 8;
453 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
454 nfmsg = NLMSG_DATA(nlh);
455
456 nlh->nlmsg_flags = flags;
457 nfmsg->nfgen_family = nf_ct_l3num(ct);
458 nfmsg->version = NFNETLINK_V0;
459 nfmsg->res_id = 0;
460
461 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
462 if (!nest_parms)
463 goto nla_put_failure;
464 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
465 goto nla_put_failure;
466 nla_nest_end(skb, nest_parms);
467
468 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
469 if (!nest_parms)
470 goto nla_put_failure;
471 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
472 goto nla_put_failure;
473 nla_nest_end(skb, nest_parms);
474
475 if (ctnetlink_dump_id(skb, ct) < 0)
476 goto nla_put_failure;
477
478 if (ctnetlink_dump_status(skb, ct) < 0)
479 goto nla_put_failure;
480
481 if (events & IPCT_DESTROY) {
482 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
483 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
484 goto nla_put_failure;
485 } else {
486 if (ctnetlink_dump_timeout(skb, ct) < 0)
487 goto nla_put_failure;
488
489 if (events & IPCT_PROTOINFO
490 && ctnetlink_dump_protoinfo(skb, ct) < 0)
491 goto nla_put_failure;
492
493 if ((events & IPCT_HELPER || nfct_help(ct))
494 && ctnetlink_dump_helpinfo(skb, ct) < 0)
495 goto nla_put_failure;
496
497 #ifdef CONFIG_NF_CONNTRACK_SECMARK
498 if ((events & IPCT_SECMARK || ct->secmark)
499 && ctnetlink_dump_secmark(skb, ct) < 0)
500 goto nla_put_failure;
501 #endif
502
503 if (events & IPCT_COUNTER_FILLING &&
504 (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
505 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
506 goto nla_put_failure;
507
508 if (events & IPCT_RELATED &&
509 ctnetlink_dump_master(skb, ct) < 0)
510 goto nla_put_failure;
511
512 if (events & IPCT_NATSEQADJ &&
513 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
514 goto nla_put_failure;
515 }
516
517 #ifdef CONFIG_NF_CONNTRACK_MARK
518 if ((events & IPCT_MARK || ct->mark)
519 && ctnetlink_dump_mark(skb, ct) < 0)
520 goto nla_put_failure;
521 #endif
522
523 nlh->nlmsg_len = skb->tail - b;
524 nfnetlink_send(skb, 0, group, 0);
525 return NOTIFY_DONE;
526
527 nlmsg_failure:
528 nla_put_failure:
529 kfree_skb(skb);
530 return NOTIFY_DONE;
531 }
532 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
533
534 static int ctnetlink_done(struct netlink_callback *cb)
535 {
536 if (cb->args[1])
537 nf_ct_put((struct nf_conn *)cb->args[1]);
538 return 0;
539 }
540
541 static int
542 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
543 {
544 struct nf_conn *ct, *last;
545 struct nf_conntrack_tuple_hash *h;
546 struct hlist_node *n;
547 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
548 u_int8_t l3proto = nfmsg->nfgen_family;
549
550 rcu_read_lock();
551 last = (struct nf_conn *)cb->args[1];
552 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
553 restart:
554 hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[cb->args[0]],
555 hnode) {
556 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
557 continue;
558 ct = nf_ct_tuplehash_to_ctrack(h);
559 /* Dump entries of a given L3 protocol number.
560 * If it is not specified, ie. l3proto == 0,
561 * then dump everything. */
562 if (l3proto && nf_ct_l3num(ct) != l3proto)
563 continue;
564 if (cb->args[1]) {
565 if (ct != last)
566 continue;
567 cb->args[1] = 0;
568 }
569 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
570 cb->nlh->nlmsg_seq,
571 IPCTNL_MSG_CT_NEW,
572 1, ct) < 0) {
573 if (!atomic_inc_not_zero(&ct->ct_general.use))
574 continue;
575 cb->args[1] = (unsigned long)ct;
576 goto out;
577 }
578 #ifdef CONFIG_NF_CT_ACCT
579 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
580 IPCTNL_MSG_CT_GET_CTRZERO)
581 memset(&ct->counters, 0, sizeof(ct->counters));
582 #endif
583 }
584 if (cb->args[1]) {
585 cb->args[1] = 0;
586 goto restart;
587 }
588 }
589 out:
590 rcu_read_unlock();
591 if (last)
592 nf_ct_put(last);
593
594 return skb->len;
595 }
596
597 static inline int
598 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
599 {
600 struct nlattr *tb[CTA_IP_MAX+1];
601 struct nf_conntrack_l3proto *l3proto;
602 int ret = 0;
603
604 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
605
606 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
607
608 if (likely(l3proto->nlattr_to_tuple)) {
609 ret = nla_validate_nested(attr, CTA_IP_MAX,
610 l3proto->nla_policy);
611 if (ret == 0)
612 ret = l3proto->nlattr_to_tuple(tb, tuple);
613 }
614
615 nf_ct_l3proto_put(l3proto);
616
617 return ret;
618 }
619
620 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
621 [CTA_PROTO_NUM] = { .type = NLA_U8 },
622 };
623
624 static inline int
625 ctnetlink_parse_tuple_proto(struct nlattr *attr,
626 struct nf_conntrack_tuple *tuple)
627 {
628 struct nlattr *tb[CTA_PROTO_MAX+1];
629 struct nf_conntrack_l4proto *l4proto;
630 int ret = 0;
631
632 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
633 if (ret < 0)
634 return ret;
635
636 if (!tb[CTA_PROTO_NUM])
637 return -EINVAL;
638 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
639
640 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
641
642 if (likely(l4proto->nlattr_to_tuple)) {
643 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
644 l4proto->nla_policy);
645 if (ret == 0)
646 ret = l4proto->nlattr_to_tuple(tb, tuple);
647 }
648
649 nf_ct_l4proto_put(l4proto);
650
651 return ret;
652 }
653
654 static int
655 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
656 enum ctattr_tuple type, u_int8_t l3num)
657 {
658 struct nlattr *tb[CTA_TUPLE_MAX+1];
659 int err;
660
661 memset(tuple, 0, sizeof(*tuple));
662
663 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
664
665 if (!tb[CTA_TUPLE_IP])
666 return -EINVAL;
667
668 tuple->src.l3num = l3num;
669
670 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
671 if (err < 0)
672 return err;
673
674 if (!tb[CTA_TUPLE_PROTO])
675 return -EINVAL;
676
677 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
678 if (err < 0)
679 return err;
680
681 /* orig and expect tuples get DIR_ORIGINAL */
682 if (type == CTA_TUPLE_REPLY)
683 tuple->dst.dir = IP_CT_DIR_REPLY;
684 else
685 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
686
687 return 0;
688 }
689
690 #ifdef CONFIG_NF_NAT_NEEDED
691 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
692 [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
693 [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
694 };
695
696 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
697 const struct nf_conn *ct,
698 struct nf_nat_range *range)
699 {
700 struct nlattr *tb[CTA_PROTONAT_MAX+1];
701 const struct nf_nat_protocol *npt;
702 int err;
703
704 err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
705 if (err < 0)
706 return err;
707
708 npt = nf_nat_proto_find_get(nf_ct_protonum(ct));
709 if (npt->nlattr_to_range)
710 err = npt->nlattr_to_range(tb, range);
711 nf_nat_proto_put(npt);
712 return err;
713 }
714
715 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
716 [CTA_NAT_MINIP] = { .type = NLA_U32 },
717 [CTA_NAT_MAXIP] = { .type = NLA_U32 },
718 };
719
720 static inline int
721 nfnetlink_parse_nat(struct nlattr *nat,
722 const struct nf_conn *ct, struct nf_nat_range *range)
723 {
724 struct nlattr *tb[CTA_NAT_MAX+1];
725 int err;
726
727 memset(range, 0, sizeof(*range));
728
729 err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
730 if (err < 0)
731 return err;
732
733 if (tb[CTA_NAT_MINIP])
734 range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
735
736 if (!tb[CTA_NAT_MAXIP])
737 range->max_ip = range->min_ip;
738 else
739 range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
740
741 if (range->min_ip)
742 range->flags |= IP_NAT_RANGE_MAP_IPS;
743
744 if (!tb[CTA_NAT_PROTO])
745 return 0;
746
747 err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
748 if (err < 0)
749 return err;
750
751 return 0;
752 }
753 #endif
754
755 static inline int
756 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
757 {
758 struct nlattr *tb[CTA_HELP_MAX+1];
759
760 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
761
762 if (!tb[CTA_HELP_NAME])
763 return -EINVAL;
764
765 *helper_name = nla_data(tb[CTA_HELP_NAME]);
766
767 return 0;
768 }
769
770 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
771 [CTA_STATUS] = { .type = NLA_U32 },
772 [CTA_TIMEOUT] = { .type = NLA_U32 },
773 [CTA_MARK] = { .type = NLA_U32 },
774 [CTA_USE] = { .type = NLA_U32 },
775 [CTA_ID] = { .type = NLA_U32 },
776 };
777
778 static int
779 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
780 struct nlmsghdr *nlh, struct nlattr *cda[])
781 {
782 struct nf_conntrack_tuple_hash *h;
783 struct nf_conntrack_tuple tuple;
784 struct nf_conn *ct;
785 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
786 u_int8_t u3 = nfmsg->nfgen_family;
787 int err = 0;
788
789 if (cda[CTA_TUPLE_ORIG])
790 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
791 else if (cda[CTA_TUPLE_REPLY])
792 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
793 else {
794 /* Flush the whole table */
795 nf_conntrack_flush();
796 return 0;
797 }
798
799 if (err < 0)
800 return err;
801
802 h = nf_conntrack_find_get(&tuple);
803 if (!h)
804 return -ENOENT;
805
806 ct = nf_ct_tuplehash_to_ctrack(h);
807
808 if (cda[CTA_ID]) {
809 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
810 if (id != (u32)(unsigned long)ct) {
811 nf_ct_put(ct);
812 return -ENOENT;
813 }
814 }
815
816 nf_ct_kill(ct);
817 nf_ct_put(ct);
818
819 return 0;
820 }
821
822 static int
823 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
824 struct nlmsghdr *nlh, struct nlattr *cda[])
825 {
826 struct nf_conntrack_tuple_hash *h;
827 struct nf_conntrack_tuple tuple;
828 struct nf_conn *ct;
829 struct sk_buff *skb2 = NULL;
830 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
831 u_int8_t u3 = nfmsg->nfgen_family;
832 int err = 0;
833
834 if (nlh->nlmsg_flags & NLM_F_DUMP) {
835 #ifndef CONFIG_NF_CT_ACCT
836 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
837 return -ENOTSUPP;
838 #endif
839 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
840 ctnetlink_done);
841 }
842
843 if (cda[CTA_TUPLE_ORIG])
844 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
845 else if (cda[CTA_TUPLE_REPLY])
846 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
847 else
848 return -EINVAL;
849
850 if (err < 0)
851 return err;
852
853 h = nf_conntrack_find_get(&tuple);
854 if (!h)
855 return -ENOENT;
856
857 ct = nf_ct_tuplehash_to_ctrack(h);
858
859 err = -ENOMEM;
860 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
861 if (!skb2) {
862 nf_ct_put(ct);
863 return -ENOMEM;
864 }
865
866 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
867 IPCTNL_MSG_CT_NEW, 1, ct);
868 nf_ct_put(ct);
869 if (err <= 0)
870 goto free;
871
872 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
873 if (err < 0)
874 goto out;
875
876 return 0;
877
878 free:
879 kfree_skb(skb2);
880 out:
881 return err;
882 }
883
884 static int
885 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
886 {
887 unsigned long d;
888 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
889 d = ct->status ^ status;
890
891 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
892 /* unchangeable */
893 return -EBUSY;
894
895 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
896 /* SEEN_REPLY bit can only be set */
897 return -EBUSY;
898
899 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
900 /* ASSURED bit can only be set */
901 return -EBUSY;
902
903 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
904 #ifndef CONFIG_NF_NAT_NEEDED
905 return -EOPNOTSUPP;
906 #else
907 struct nf_nat_range range;
908
909 if (cda[CTA_NAT_DST]) {
910 if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
911 &range) < 0)
912 return -EINVAL;
913 if (nf_nat_initialized(ct, IP_NAT_MANIP_DST))
914 return -EEXIST;
915 nf_nat_setup_info(ct, &range, IP_NAT_MANIP_DST);
916 }
917 if (cda[CTA_NAT_SRC]) {
918 if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
919 &range) < 0)
920 return -EINVAL;
921 if (nf_nat_initialized(ct, IP_NAT_MANIP_SRC))
922 return -EEXIST;
923 nf_nat_setup_info(ct, &range, IP_NAT_MANIP_SRC);
924 }
925 #endif
926 }
927
928 /* Be careful here, modifying NAT bits can screw up things,
929 * so don't let users modify them directly if they don't pass
930 * nf_nat_range. */
931 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
932 return 0;
933 }
934
935
936 static inline int
937 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
938 {
939 struct nf_conntrack_helper *helper;
940 struct nf_conn_help *help = nfct_help(ct);
941 char *helpname;
942 int err;
943
944 /* don't change helper of sibling connections */
945 if (ct->master)
946 return -EBUSY;
947
948 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
949 if (err < 0)
950 return err;
951
952 if (!strcmp(helpname, "")) {
953 if (help && help->helper) {
954 /* we had a helper before ... */
955 nf_ct_remove_expectations(ct);
956 rcu_assign_pointer(help->helper, NULL);
957 }
958
959 return 0;
960 }
961
962 helper = __nf_conntrack_helper_find_byname(helpname);
963 if (helper == NULL)
964 return -EOPNOTSUPP;
965
966 if (help) {
967 if (help->helper == helper)
968 return 0;
969 if (help->helper)
970 return -EBUSY;
971 /* need to zero data of old helper */
972 memset(&help->help, 0, sizeof(help->help));
973 } else {
974 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
975 if (help == NULL)
976 return -ENOMEM;
977 }
978
979 rcu_assign_pointer(help->helper, helper);
980
981 return 0;
982 }
983
984 static inline int
985 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
986 {
987 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
988
989 if (!del_timer(&ct->timeout))
990 return -ETIME;
991
992 ct->timeout.expires = jiffies + timeout * HZ;
993 add_timer(&ct->timeout);
994
995 return 0;
996 }
997
998 static inline int
999 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1000 {
1001 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1002 struct nf_conntrack_l4proto *l4proto;
1003 int err = 0;
1004
1005 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1006
1007 l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
1008 if (l4proto->from_nlattr)
1009 err = l4proto->from_nlattr(tb, ct);
1010 nf_ct_l4proto_put(l4proto);
1011
1012 return err;
1013 }
1014
1015 #ifdef CONFIG_NF_NAT_NEEDED
1016 static inline int
1017 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1018 {
1019 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1020
1021 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1022
1023 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1024 return -EINVAL;
1025
1026 natseq->correction_pos =
1027 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1028
1029 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1030 return -EINVAL;
1031
1032 natseq->offset_before =
1033 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1034
1035 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1036 return -EINVAL;
1037
1038 natseq->offset_after =
1039 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1040
1041 return 0;
1042 }
1043
1044 static int
1045 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1046 {
1047 int ret = 0;
1048 struct nf_conn_nat *nat = nfct_nat(ct);
1049
1050 if (!nat)
1051 return 0;
1052
1053 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1054 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1055 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1056 if (ret < 0)
1057 return ret;
1058
1059 ct->status |= IPS_SEQ_ADJUST;
1060 }
1061
1062 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1063 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1064 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1065 if (ret < 0)
1066 return ret;
1067
1068 ct->status |= IPS_SEQ_ADJUST;
1069 }
1070
1071 return 0;
1072 }
1073 #endif
1074
1075 static int
1076 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1077 {
1078 int err;
1079
1080 if (cda[CTA_HELP]) {
1081 err = ctnetlink_change_helper(ct, cda);
1082 if (err < 0)
1083 return err;
1084 }
1085
1086 if (cda[CTA_TIMEOUT]) {
1087 err = ctnetlink_change_timeout(ct, cda);
1088 if (err < 0)
1089 return err;
1090 }
1091
1092 if (cda[CTA_STATUS]) {
1093 err = ctnetlink_change_status(ct, cda);
1094 if (err < 0)
1095 return err;
1096 }
1097
1098 if (cda[CTA_PROTOINFO]) {
1099 err = ctnetlink_change_protoinfo(ct, cda);
1100 if (err < 0)
1101 return err;
1102 }
1103
1104 #if defined(CONFIG_NF_CONNTRACK_MARK)
1105 if (cda[CTA_MARK])
1106 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1107 #endif
1108
1109 #ifdef CONFIG_NF_NAT_NEEDED
1110 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1111 err = ctnetlink_change_nat_seq_adj(ct, cda);
1112 if (err < 0)
1113 return err;
1114 }
1115 #endif
1116
1117 return 0;
1118 }
1119
1120 static int
1121 ctnetlink_create_conntrack(struct nlattr *cda[],
1122 struct nf_conntrack_tuple *otuple,
1123 struct nf_conntrack_tuple *rtuple,
1124 struct nf_conn *master_ct)
1125 {
1126 struct nf_conn *ct;
1127 int err = -EINVAL;
1128 struct nf_conn_help *help;
1129 struct nf_conntrack_helper *helper;
1130
1131 ct = nf_conntrack_alloc(otuple, rtuple);
1132 if (ct == NULL || IS_ERR(ct))
1133 return -ENOMEM;
1134
1135 if (!cda[CTA_TIMEOUT])
1136 goto err;
1137 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1138
1139 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1140 ct->status |= IPS_CONFIRMED;
1141
1142 if (cda[CTA_STATUS]) {
1143 err = ctnetlink_change_status(ct, cda);
1144 if (err < 0)
1145 goto err;
1146 }
1147
1148 if (cda[CTA_PROTOINFO]) {
1149 err = ctnetlink_change_protoinfo(ct, cda);
1150 if (err < 0)
1151 goto err;
1152 }
1153
1154 #if defined(CONFIG_NF_CONNTRACK_MARK)
1155 if (cda[CTA_MARK])
1156 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1157 #endif
1158
1159 rcu_read_lock();
1160 helper = __nf_ct_helper_find(rtuple);
1161 if (helper) {
1162 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1163 if (help == NULL) {
1164 rcu_read_unlock();
1165 err = -ENOMEM;
1166 goto err;
1167 }
1168 /* not in hash table yet so not strictly necessary */
1169 rcu_assign_pointer(help->helper, helper);
1170 }
1171
1172 /* setup master conntrack: this is a confirmed expectation */
1173 if (master_ct) {
1174 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1175 ct->master = master_ct;
1176 }
1177
1178 add_timer(&ct->timeout);
1179 nf_conntrack_hash_insert(ct);
1180 rcu_read_unlock();
1181
1182 return 0;
1183
1184 err:
1185 nf_conntrack_free(ct);
1186 return err;
1187 }
1188
1189 static int
1190 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1191 struct nlmsghdr *nlh, struct nlattr *cda[])
1192 {
1193 struct nf_conntrack_tuple otuple, rtuple;
1194 struct nf_conntrack_tuple_hash *h = NULL;
1195 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1196 u_int8_t u3 = nfmsg->nfgen_family;
1197 int err = 0;
1198
1199 if (cda[CTA_TUPLE_ORIG]) {
1200 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1201 if (err < 0)
1202 return err;
1203 }
1204
1205 if (cda[CTA_TUPLE_REPLY]) {
1206 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1207 if (err < 0)
1208 return err;
1209 }
1210
1211 spin_lock_bh(&nf_conntrack_lock);
1212 if (cda[CTA_TUPLE_ORIG])
1213 h = __nf_conntrack_find(&otuple);
1214 else if (cda[CTA_TUPLE_REPLY])
1215 h = __nf_conntrack_find(&rtuple);
1216
1217 if (h == NULL) {
1218 struct nf_conntrack_tuple master;
1219 struct nf_conntrack_tuple_hash *master_h = NULL;
1220 struct nf_conn *master_ct = NULL;
1221
1222 if (cda[CTA_TUPLE_MASTER]) {
1223 err = ctnetlink_parse_tuple(cda,
1224 &master,
1225 CTA_TUPLE_MASTER,
1226 u3);
1227 if (err < 0)
1228 goto out_unlock;
1229
1230 master_h = __nf_conntrack_find(&master);
1231 if (master_h == NULL) {
1232 err = -ENOENT;
1233 goto out_unlock;
1234 }
1235 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1236 atomic_inc(&master_ct->ct_general.use);
1237 }
1238
1239 spin_unlock_bh(&nf_conntrack_lock);
1240 err = -ENOENT;
1241 if (nlh->nlmsg_flags & NLM_F_CREATE)
1242 err = ctnetlink_create_conntrack(cda,
1243 &otuple,
1244 &rtuple,
1245 master_ct);
1246 if (err < 0 && master_ct)
1247 nf_ct_put(master_ct);
1248
1249 return err;
1250 }
1251 /* implicit 'else' */
1252
1253 /* We manipulate the conntrack inside the global conntrack table lock,
1254 * so there's no need to increase the refcount */
1255 err = -EEXIST;
1256 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1257 /* we only allow nat config for new conntracks */
1258 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1259 err = -EOPNOTSUPP;
1260 goto out_unlock;
1261 }
1262 /* can't link an existing conntrack to a master */
1263 if (cda[CTA_TUPLE_MASTER]) {
1264 err = -EOPNOTSUPP;
1265 goto out_unlock;
1266 }
1267 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1268 cda);
1269 }
1270
1271 out_unlock:
1272 spin_unlock_bh(&nf_conntrack_lock);
1273 return err;
1274 }
1275
1276 /***********************************************************************
1277 * EXPECT
1278 ***********************************************************************/
1279
1280 static inline int
1281 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1282 const struct nf_conntrack_tuple *tuple,
1283 enum ctattr_expect type)
1284 {
1285 struct nlattr *nest_parms;
1286
1287 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1288 if (!nest_parms)
1289 goto nla_put_failure;
1290 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1291 goto nla_put_failure;
1292 nla_nest_end(skb, nest_parms);
1293
1294 return 0;
1295
1296 nla_put_failure:
1297 return -1;
1298 }
1299
1300 static inline int
1301 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1302 const struct nf_conntrack_tuple *tuple,
1303 const struct nf_conntrack_tuple_mask *mask)
1304 {
1305 int ret;
1306 struct nf_conntrack_l3proto *l3proto;
1307 struct nf_conntrack_l4proto *l4proto;
1308 struct nf_conntrack_tuple m;
1309 struct nlattr *nest_parms;
1310
1311 memset(&m, 0xFF, sizeof(m));
1312 m.src.u.all = mask->src.u.all;
1313 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1314
1315 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1316 if (!nest_parms)
1317 goto nla_put_failure;
1318
1319 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1320 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1321 nf_ct_l3proto_put(l3proto);
1322
1323 if (unlikely(ret < 0))
1324 goto nla_put_failure;
1325
1326 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1327 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1328 nf_ct_l4proto_put(l4proto);
1329 if (unlikely(ret < 0))
1330 goto nla_put_failure;
1331
1332 nla_nest_end(skb, nest_parms);
1333
1334 return 0;
1335
1336 nla_put_failure:
1337 return -1;
1338 }
1339
1340 static int
1341 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1342 const struct nf_conntrack_expect *exp)
1343 {
1344 struct nf_conn *master = exp->master;
1345 long timeout = (exp->timeout.expires - jiffies) / HZ;
1346
1347 if (timeout < 0)
1348 timeout = 0;
1349
1350 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1351 goto nla_put_failure;
1352 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1353 goto nla_put_failure;
1354 if (ctnetlink_exp_dump_tuple(skb,
1355 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1356 CTA_EXPECT_MASTER) < 0)
1357 goto nla_put_failure;
1358
1359 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1360 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1361
1362 return 0;
1363
1364 nla_put_failure:
1365 return -1;
1366 }
1367
1368 static int
1369 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1370 int event,
1371 int nowait,
1372 const struct nf_conntrack_expect *exp)
1373 {
1374 struct nlmsghdr *nlh;
1375 struct nfgenmsg *nfmsg;
1376 unsigned char *b = skb_tail_pointer(skb);
1377
1378 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1379 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1380 nfmsg = NLMSG_DATA(nlh);
1381
1382 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1383 nfmsg->nfgen_family = exp->tuple.src.l3num;
1384 nfmsg->version = NFNETLINK_V0;
1385 nfmsg->res_id = 0;
1386
1387 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1388 goto nla_put_failure;
1389
1390 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1391 return skb->len;
1392
1393 nlmsg_failure:
1394 nla_put_failure:
1395 nlmsg_trim(skb, b);
1396 return -1;
1397 }
1398
1399 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1400 static int ctnetlink_expect_event(struct notifier_block *this,
1401 unsigned long events, void *ptr)
1402 {
1403 struct nlmsghdr *nlh;
1404 struct nfgenmsg *nfmsg;
1405 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1406 struct sk_buff *skb;
1407 unsigned int type;
1408 sk_buff_data_t b;
1409 int flags = 0;
1410
1411 if (events & IPEXP_NEW) {
1412 type = IPCTNL_MSG_EXP_NEW;
1413 flags = NLM_F_CREATE|NLM_F_EXCL;
1414 } else
1415 return NOTIFY_DONE;
1416
1417 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1418 return NOTIFY_DONE;
1419
1420 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1421 if (!skb)
1422 return NOTIFY_DONE;
1423
1424 b = skb->tail;
1425
1426 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1427 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1428 nfmsg = NLMSG_DATA(nlh);
1429
1430 nlh->nlmsg_flags = flags;
1431 nfmsg->nfgen_family = exp->tuple.src.l3num;
1432 nfmsg->version = NFNETLINK_V0;
1433 nfmsg->res_id = 0;
1434
1435 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1436 goto nla_put_failure;
1437
1438 nlh->nlmsg_len = skb->tail - b;
1439 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1440 return NOTIFY_DONE;
1441
1442 nlmsg_failure:
1443 nla_put_failure:
1444 kfree_skb(skb);
1445 return NOTIFY_DONE;
1446 }
1447 #endif
1448 static int ctnetlink_exp_done(struct netlink_callback *cb)
1449 {
1450 if (cb->args[1])
1451 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1452 return 0;
1453 }
1454
1455 static int
1456 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1457 {
1458 struct nf_conntrack_expect *exp, *last;
1459 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1460 struct hlist_node *n;
1461 u_int8_t l3proto = nfmsg->nfgen_family;
1462
1463 rcu_read_lock();
1464 last = (struct nf_conntrack_expect *)cb->args[1];
1465 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1466 restart:
1467 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1468 hnode) {
1469 if (l3proto && exp->tuple.src.l3num != l3proto)
1470 continue;
1471 if (cb->args[1]) {
1472 if (exp != last)
1473 continue;
1474 cb->args[1] = 0;
1475 }
1476 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1477 cb->nlh->nlmsg_seq,
1478 IPCTNL_MSG_EXP_NEW,
1479 1, exp) < 0) {
1480 if (!atomic_inc_not_zero(&exp->use))
1481 continue;
1482 cb->args[1] = (unsigned long)exp;
1483 goto out;
1484 }
1485 }
1486 if (cb->args[1]) {
1487 cb->args[1] = 0;
1488 goto restart;
1489 }
1490 }
1491 out:
1492 rcu_read_unlock();
1493 if (last)
1494 nf_ct_expect_put(last);
1495
1496 return skb->len;
1497 }
1498
1499 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1500 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1501 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1502 };
1503
1504 static int
1505 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1506 struct nlmsghdr *nlh, struct nlattr *cda[])
1507 {
1508 struct nf_conntrack_tuple tuple;
1509 struct nf_conntrack_expect *exp;
1510 struct sk_buff *skb2;
1511 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1512 u_int8_t u3 = nfmsg->nfgen_family;
1513 int err = 0;
1514
1515 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1516 return netlink_dump_start(ctnl, skb, nlh,
1517 ctnetlink_exp_dump_table,
1518 ctnetlink_exp_done);
1519 }
1520
1521 if (cda[CTA_EXPECT_MASTER])
1522 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1523 else
1524 return -EINVAL;
1525
1526 if (err < 0)
1527 return err;
1528
1529 exp = nf_ct_expect_find_get(&tuple);
1530 if (!exp)
1531 return -ENOENT;
1532
1533 if (cda[CTA_EXPECT_ID]) {
1534 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1535 if (ntohl(id) != (u32)(unsigned long)exp) {
1536 nf_ct_expect_put(exp);
1537 return -ENOENT;
1538 }
1539 }
1540
1541 err = -ENOMEM;
1542 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1543 if (!skb2)
1544 goto out;
1545
1546 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1547 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1548 1, exp);
1549 if (err <= 0)
1550 goto free;
1551
1552 nf_ct_expect_put(exp);
1553
1554 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1555
1556 free:
1557 kfree_skb(skb2);
1558 out:
1559 nf_ct_expect_put(exp);
1560 return err;
1561 }
1562
1563 static int
1564 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1565 struct nlmsghdr *nlh, struct nlattr *cda[])
1566 {
1567 struct nf_conntrack_expect *exp;
1568 struct nf_conntrack_tuple tuple;
1569 struct nf_conntrack_helper *h;
1570 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1571 struct hlist_node *n, *next;
1572 u_int8_t u3 = nfmsg->nfgen_family;
1573 unsigned int i;
1574 int err;
1575
1576 if (cda[CTA_EXPECT_TUPLE]) {
1577 /* delete a single expect by tuple */
1578 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1579 if (err < 0)
1580 return err;
1581
1582 /* bump usage count to 2 */
1583 exp = nf_ct_expect_find_get(&tuple);
1584 if (!exp)
1585 return -ENOENT;
1586
1587 if (cda[CTA_EXPECT_ID]) {
1588 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1589 if (ntohl(id) != (u32)(unsigned long)exp) {
1590 nf_ct_expect_put(exp);
1591 return -ENOENT;
1592 }
1593 }
1594
1595 /* after list removal, usage count == 1 */
1596 nf_ct_unexpect_related(exp);
1597 /* have to put what we 'get' above.
1598 * after this line usage count == 0 */
1599 nf_ct_expect_put(exp);
1600 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1601 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1602 struct nf_conn_help *m_help;
1603
1604 /* delete all expectations for this helper */
1605 spin_lock_bh(&nf_conntrack_lock);
1606 h = __nf_conntrack_helper_find_byname(name);
1607 if (!h) {
1608 spin_unlock_bh(&nf_conntrack_lock);
1609 return -EOPNOTSUPP;
1610 }
1611 for (i = 0; i < nf_ct_expect_hsize; i++) {
1612 hlist_for_each_entry_safe(exp, n, next,
1613 &nf_ct_expect_hash[i],
1614 hnode) {
1615 m_help = nfct_help(exp->master);
1616 if (m_help->helper == h
1617 && del_timer(&exp->timeout)) {
1618 nf_ct_unlink_expect(exp);
1619 nf_ct_expect_put(exp);
1620 }
1621 }
1622 }
1623 spin_unlock_bh(&nf_conntrack_lock);
1624 } else {
1625 /* This basically means we have to flush everything*/
1626 spin_lock_bh(&nf_conntrack_lock);
1627 for (i = 0; i < nf_ct_expect_hsize; i++) {
1628 hlist_for_each_entry_safe(exp, n, next,
1629 &nf_ct_expect_hash[i],
1630 hnode) {
1631 if (del_timer(&exp->timeout)) {
1632 nf_ct_unlink_expect(exp);
1633 nf_ct_expect_put(exp);
1634 }
1635 }
1636 }
1637 spin_unlock_bh(&nf_conntrack_lock);
1638 }
1639
1640 return 0;
1641 }
1642 static int
1643 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1644 {
1645 return -EOPNOTSUPP;
1646 }
1647
1648 static int
1649 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1650 {
1651 struct nf_conntrack_tuple tuple, mask, master_tuple;
1652 struct nf_conntrack_tuple_hash *h = NULL;
1653 struct nf_conntrack_expect *exp;
1654 struct nf_conn *ct;
1655 struct nf_conn_help *help;
1656 int err = 0;
1657
1658 /* caller guarantees that those three CTA_EXPECT_* exist */
1659 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1660 if (err < 0)
1661 return err;
1662 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1663 if (err < 0)
1664 return err;
1665 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1666 if (err < 0)
1667 return err;
1668
1669 /* Look for master conntrack of this expectation */
1670 h = nf_conntrack_find_get(&master_tuple);
1671 if (!h)
1672 return -ENOENT;
1673 ct = nf_ct_tuplehash_to_ctrack(h);
1674 help = nfct_help(ct);
1675
1676 if (!help || !help->helper) {
1677 /* such conntrack hasn't got any helper, abort */
1678 err = -EINVAL;
1679 goto out;
1680 }
1681
1682 exp = nf_ct_expect_alloc(ct);
1683 if (!exp) {
1684 err = -ENOMEM;
1685 goto out;
1686 }
1687
1688 exp->expectfn = NULL;
1689 exp->flags = 0;
1690 exp->master = ct;
1691 exp->helper = NULL;
1692 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1693 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1694 exp->mask.src.u.all = mask.src.u.all;
1695
1696 err = nf_ct_expect_related(exp);
1697 nf_ct_expect_put(exp);
1698
1699 out:
1700 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1701 return err;
1702 }
1703
1704 static int
1705 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1706 struct nlmsghdr *nlh, struct nlattr *cda[])
1707 {
1708 struct nf_conntrack_tuple tuple;
1709 struct nf_conntrack_expect *exp;
1710 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1711 u_int8_t u3 = nfmsg->nfgen_family;
1712 int err = 0;
1713
1714 if (!cda[CTA_EXPECT_TUPLE]
1715 || !cda[CTA_EXPECT_MASK]
1716 || !cda[CTA_EXPECT_MASTER])
1717 return -EINVAL;
1718
1719 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1720 if (err < 0)
1721 return err;
1722
1723 spin_lock_bh(&nf_conntrack_lock);
1724 exp = __nf_ct_expect_find(&tuple);
1725
1726 if (!exp) {
1727 spin_unlock_bh(&nf_conntrack_lock);
1728 err = -ENOENT;
1729 if (nlh->nlmsg_flags & NLM_F_CREATE)
1730 err = ctnetlink_create_expect(cda, u3);
1731 return err;
1732 }
1733
1734 err = -EEXIST;
1735 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1736 err = ctnetlink_change_expect(exp, cda);
1737 spin_unlock_bh(&nf_conntrack_lock);
1738
1739 return err;
1740 }
1741
1742 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1743 static struct notifier_block ctnl_notifier = {
1744 .notifier_call = ctnetlink_conntrack_event,
1745 };
1746
1747 static struct notifier_block ctnl_notifier_exp = {
1748 .notifier_call = ctnetlink_expect_event,
1749 };
1750 #endif
1751
1752 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1753 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1754 .attr_count = CTA_MAX,
1755 .policy = ct_nla_policy },
1756 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1757 .attr_count = CTA_MAX,
1758 .policy = ct_nla_policy },
1759 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1760 .attr_count = CTA_MAX,
1761 .policy = ct_nla_policy },
1762 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1763 .attr_count = CTA_MAX,
1764 .policy = ct_nla_policy },
1765 };
1766
1767 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1768 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1769 .attr_count = CTA_EXPECT_MAX,
1770 .policy = exp_nla_policy },
1771 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1772 .attr_count = CTA_EXPECT_MAX,
1773 .policy = exp_nla_policy },
1774 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1775 .attr_count = CTA_EXPECT_MAX,
1776 .policy = exp_nla_policy },
1777 };
1778
1779 static const struct nfnetlink_subsystem ctnl_subsys = {
1780 .name = "conntrack",
1781 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1782 .cb_count = IPCTNL_MSG_MAX,
1783 .cb = ctnl_cb,
1784 };
1785
1786 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1787 .name = "conntrack_expect",
1788 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1789 .cb_count = IPCTNL_MSG_EXP_MAX,
1790 .cb = ctnl_exp_cb,
1791 };
1792
1793 MODULE_ALIAS("ip_conntrack_netlink");
1794 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1795 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1796
1797 static int __init ctnetlink_init(void)
1798 {
1799 int ret;
1800
1801 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1802 ret = nfnetlink_subsys_register(&ctnl_subsys);
1803 if (ret < 0) {
1804 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1805 goto err_out;
1806 }
1807
1808 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1809 if (ret < 0) {
1810 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1811 goto err_unreg_subsys;
1812 }
1813
1814 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1815 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1816 if (ret < 0) {
1817 printk("ctnetlink_init: cannot register notifier.\n");
1818 goto err_unreg_exp_subsys;
1819 }
1820
1821 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1822 if (ret < 0) {
1823 printk("ctnetlink_init: cannot expect register notifier.\n");
1824 goto err_unreg_notifier;
1825 }
1826 #endif
1827
1828 return 0;
1829
1830 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1831 err_unreg_notifier:
1832 nf_conntrack_unregister_notifier(&ctnl_notifier);
1833 err_unreg_exp_subsys:
1834 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1835 #endif
1836 err_unreg_subsys:
1837 nfnetlink_subsys_unregister(&ctnl_subsys);
1838 err_out:
1839 return ret;
1840 }
1841
1842 static void __exit ctnetlink_exit(void)
1843 {
1844 printk("ctnetlink: unregistering from nfnetlink.\n");
1845
1846 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1847 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1848 nf_conntrack_unregister_notifier(&ctnl_notifier);
1849 #endif
1850
1851 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1852 nfnetlink_subsys_unregister(&ctnl_subsys);
1853 return;
1854 }
1855
1856 module_init(ctnetlink_init);
1857 module_exit(ctnetlink_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree