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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/skbuff.h>
26 #include <linux/errno.h>
27 #include <linux/netlink.h>
28 #include <linux/spinlock.h>
29 #include <linux/interrupt.h>
30 #include <linux/slab.h>
31
32 #include <linux/netfilter.h>
33 #include <net/netlink.h>
34 #include <net/sock.h>
35 #include <net/netfilter/nf_conntrack.h>
36 #include <net/netfilter/nf_conntrack_core.h>
37 #include <net/netfilter/nf_conntrack_expect.h>
38 #include <net/netfilter/nf_conntrack_helper.h>
39 #include <net/netfilter/nf_conntrack_l3proto.h>
40 #include <net/netfilter/nf_conntrack_l4proto.h>
41 #include <net/netfilter/nf_conntrack_tuple.h>
42 #include <net/netfilter/nf_conntrack_acct.h>
43 #include <net/netfilter/nf_conntrack_zones.h>
44 #ifdef CONFIG_NF_NAT_NEEDED
45 #include <net/netfilter/nf_nat_core.h>
46 #include <net/netfilter/nf_nat_protocol.h>
47 #endif
48
49 #include <linux/netfilter/nfnetlink.h>
50 #include <linux/netfilter/nfnetlink_conntrack.h>
51
52 MODULE_LICENSE("GPL");
53
54 static char __initdata version[] = "0.93";
55
56 static inline int
57 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
58 const struct nf_conntrack_tuple *tuple,
59 struct nf_conntrack_l4proto *l4proto)
60 {
61 int ret = 0;
62 struct nlattr *nest_parms;
63
64 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
65 if (!nest_parms)
66 goto nla_put_failure;
67 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
68
69 if (likely(l4proto->tuple_to_nlattr))
70 ret = l4proto->tuple_to_nlattr(skb, tuple);
71
72 nla_nest_end(skb, nest_parms);
73
74 return ret;
75
76 nla_put_failure:
77 return -1;
78 }
79
80 static inline int
81 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
82 const struct nf_conntrack_tuple *tuple,
83 struct nf_conntrack_l3proto *l3proto)
84 {
85 int ret = 0;
86 struct nlattr *nest_parms;
87
88 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
89 if (!nest_parms)
90 goto nla_put_failure;
91
92 if (likely(l3proto->tuple_to_nlattr))
93 ret = l3proto->tuple_to_nlattr(skb, tuple);
94
95 nla_nest_end(skb, nest_parms);
96
97 return ret;
98
99 nla_put_failure:
100 return -1;
101 }
102
103 static int
104 ctnetlink_dump_tuples(struct sk_buff *skb,
105 const struct nf_conntrack_tuple *tuple)
106 {
107 int ret;
108 struct nf_conntrack_l3proto *l3proto;
109 struct nf_conntrack_l4proto *l4proto;
110
111 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
112 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
113
114 if (unlikely(ret < 0))
115 return ret;
116
117 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
118 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
119
120 return ret;
121 }
122
123 static inline int
124 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
125 {
126 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
127 return 0;
128
129 nla_put_failure:
130 return -1;
131 }
132
133 static inline int
134 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
135 {
136 long timeout = (ct->timeout.expires - jiffies) / HZ;
137
138 if (timeout < 0)
139 timeout = 0;
140
141 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
142 return 0;
143
144 nla_put_failure:
145 return -1;
146 }
147
148 static inline int
149 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
150 {
151 struct nf_conntrack_l4proto *l4proto;
152 struct nlattr *nest_proto;
153 int ret;
154
155 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
156 if (!l4proto->to_nlattr)
157 return 0;
158
159 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
160 if (!nest_proto)
161 goto nla_put_failure;
162
163 ret = l4proto->to_nlattr(skb, nest_proto, ct);
164
165 nla_nest_end(skb, nest_proto);
166
167 return ret;
168
169 nla_put_failure:
170 return -1;
171 }
172
173 static inline int
174 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
175 {
176 struct nlattr *nest_helper;
177 const struct nf_conn_help *help = nfct_help(ct);
178 struct nf_conntrack_helper *helper;
179
180 if (!help)
181 return 0;
182
183 helper = rcu_dereference(help->helper);
184 if (!helper)
185 goto out;
186
187 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
188 if (!nest_helper)
189 goto nla_put_failure;
190 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
191
192 if (helper->to_nlattr)
193 helper->to_nlattr(skb, ct);
194
195 nla_nest_end(skb, nest_helper);
196 out:
197 return 0;
198
199 nla_put_failure:
200 return -1;
201 }
202
203 static int
204 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
205 enum ip_conntrack_dir dir)
206 {
207 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
208 struct nlattr *nest_count;
209 const struct nf_conn_counter *acct;
210
211 acct = nf_conn_acct_find(ct);
212 if (!acct)
213 return 0;
214
215 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
216 if (!nest_count)
217 goto nla_put_failure;
218
219 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
220 cpu_to_be64(acct[dir].packets));
221 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
222 cpu_to_be64(acct[dir].bytes));
223
224 nla_nest_end(skb, nest_count);
225
226 return 0;
227
228 nla_put_failure:
229 return -1;
230 }
231
232 #ifdef CONFIG_NF_CONNTRACK_MARK
233 static inline int
234 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
235 {
236 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
237 return 0;
238
239 nla_put_failure:
240 return -1;
241 }
242 #else
243 #define ctnetlink_dump_mark(a, b) (0)
244 #endif
245
246 #ifdef CONFIG_NF_CONNTRACK_SECMARK
247 static inline int
248 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
249 {
250 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
251 return 0;
252
253 nla_put_failure:
254 return -1;
255 }
256 #else
257 #define ctnetlink_dump_secmark(a, b) (0)
258 #endif
259
260 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
261
262 static inline int
263 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
264 {
265 struct nlattr *nest_parms;
266
267 if (!(ct->status & IPS_EXPECTED))
268 return 0;
269
270 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
271 if (!nest_parms)
272 goto nla_put_failure;
273 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
274 goto nla_put_failure;
275 nla_nest_end(skb, nest_parms);
276
277 return 0;
278
279 nla_put_failure:
280 return -1;
281 }
282
283 #ifdef CONFIG_NF_NAT_NEEDED
284 static int
285 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
286 {
287 struct nlattr *nest_parms;
288
289 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
290 if (!nest_parms)
291 goto nla_put_failure;
292
293 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
294 htonl(natseq->correction_pos));
295 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
296 htonl(natseq->offset_before));
297 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
298 htonl(natseq->offset_after));
299
300 nla_nest_end(skb, nest_parms);
301
302 return 0;
303
304 nla_put_failure:
305 return -1;
306 }
307
308 static inline int
309 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
310 {
311 struct nf_nat_seq *natseq;
312 struct nf_conn_nat *nat = nfct_nat(ct);
313
314 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
315 return 0;
316
317 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
318 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
319 return -1;
320
321 natseq = &nat->seq[IP_CT_DIR_REPLY];
322 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
323 return -1;
324
325 return 0;
326 }
327 #else
328 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
329 #endif
330
331 static inline int
332 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
333 {
334 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
335 return 0;
336
337 nla_put_failure:
338 return -1;
339 }
340
341 static inline int
342 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
343 {
344 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
345 return 0;
346
347 nla_put_failure:
348 return -1;
349 }
350
351 static int
352 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
353 int event, struct nf_conn *ct)
354 {
355 struct nlmsghdr *nlh;
356 struct nfgenmsg *nfmsg;
357 struct nlattr *nest_parms;
358 unsigned int flags = pid ? NLM_F_MULTI : 0;
359
360 event |= NFNL_SUBSYS_CTNETLINK << 8;
361 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
362 if (nlh == NULL)
363 goto nlmsg_failure;
364
365 nfmsg = nlmsg_data(nlh);
366 nfmsg->nfgen_family = nf_ct_l3num(ct);
367 nfmsg->version = NFNETLINK_V0;
368 nfmsg->res_id = 0;
369
370 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
371 if (!nest_parms)
372 goto nla_put_failure;
373 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
374 goto nla_put_failure;
375 nla_nest_end(skb, nest_parms);
376
377 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
378 if (!nest_parms)
379 goto nla_put_failure;
380 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
381 goto nla_put_failure;
382 nla_nest_end(skb, nest_parms);
383
384 if (nf_ct_zone(ct))
385 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
386
387 if (ctnetlink_dump_status(skb, ct) < 0 ||
388 ctnetlink_dump_timeout(skb, ct) < 0 ||
389 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
390 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
391 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
392 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
393 ctnetlink_dump_mark(skb, ct) < 0 ||
394 ctnetlink_dump_secmark(skb, ct) < 0 ||
395 ctnetlink_dump_id(skb, ct) < 0 ||
396 ctnetlink_dump_use(skb, ct) < 0 ||
397 ctnetlink_dump_master(skb, ct) < 0 ||
398 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
399 goto nla_put_failure;
400
401 nlmsg_end(skb, nlh);
402 return skb->len;
403
404 nlmsg_failure:
405 nla_put_failure:
406 nlmsg_cancel(skb, nlh);
407 return -1;
408 }
409
410 #ifdef CONFIG_NF_CONNTRACK_EVENTS
411 static inline size_t
412 ctnetlink_proto_size(const struct nf_conn *ct)
413 {
414 struct nf_conntrack_l3proto *l3proto;
415 struct nf_conntrack_l4proto *l4proto;
416 size_t len = 0;
417
418 rcu_read_lock();
419 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
420 len += l3proto->nla_size;
421
422 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
423 len += l4proto->nla_size;
424 rcu_read_unlock();
425
426 return len;
427 }
428
429 static inline size_t
430 ctnetlink_nlmsg_size(const struct nf_conn *ct)
431 {
432 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
433 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
434 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
435 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
436 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
437 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
438 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
439 #ifdef CONFIG_NF_CT_ACCT
440 + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
441 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
442 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
443 #endif
444 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
445 + nla_total_size(0) /* CTA_PROTOINFO */
446 + nla_total_size(0) /* CTA_HELP */
447 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
448 #ifdef CONFIG_NF_CONNTRACK_SECMARK
449 + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
450 #endif
451 #ifdef CONFIG_NF_NAT_NEEDED
452 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
453 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
454 #endif
455 #ifdef CONFIG_NF_CONNTRACK_MARK
456 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
457 #endif
458 + ctnetlink_proto_size(ct)
459 ;
460 }
461
462 static int
463 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
464 {
465 struct net *net;
466 struct nlmsghdr *nlh;
467 struct nfgenmsg *nfmsg;
468 struct nlattr *nest_parms;
469 struct nf_conn *ct = item->ct;
470 struct sk_buff *skb;
471 unsigned int type;
472 unsigned int flags = 0, group;
473 int err;
474
475 /* ignore our fake conntrack entry */
476 if (ct == &nf_conntrack_untracked)
477 return 0;
478
479 if (events & (1 << IPCT_DESTROY)) {
480 type = IPCTNL_MSG_CT_DELETE;
481 group = NFNLGRP_CONNTRACK_DESTROY;
482 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
483 type = IPCTNL_MSG_CT_NEW;
484 flags = NLM_F_CREATE|NLM_F_EXCL;
485 group = NFNLGRP_CONNTRACK_NEW;
486 } else if (events) {
487 type = IPCTNL_MSG_CT_NEW;
488 group = NFNLGRP_CONNTRACK_UPDATE;
489 } else
490 return 0;
491
492 net = nf_ct_net(ct);
493 if (!item->report && !nfnetlink_has_listeners(net, group))
494 return 0;
495
496 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
497 if (skb == NULL)
498 goto errout;
499
500 type |= NFNL_SUBSYS_CTNETLINK << 8;
501 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
502 if (nlh == NULL)
503 goto nlmsg_failure;
504
505 nfmsg = nlmsg_data(nlh);
506 nfmsg->nfgen_family = nf_ct_l3num(ct);
507 nfmsg->version = NFNETLINK_V0;
508 nfmsg->res_id = 0;
509
510 rcu_read_lock();
511 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
512 if (!nest_parms)
513 goto nla_put_failure;
514 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
515 goto nla_put_failure;
516 nla_nest_end(skb, nest_parms);
517
518 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
519 if (!nest_parms)
520 goto nla_put_failure;
521 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
522 goto nla_put_failure;
523 nla_nest_end(skb, nest_parms);
524
525 if (nf_ct_zone(ct))
526 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
527
528 if (ctnetlink_dump_id(skb, ct) < 0)
529 goto nla_put_failure;
530
531 if (ctnetlink_dump_status(skb, ct) < 0)
532 goto nla_put_failure;
533
534 if (events & (1 << IPCT_DESTROY)) {
535 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
536 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
537 goto nla_put_failure;
538 } else {
539 if (ctnetlink_dump_timeout(skb, ct) < 0)
540 goto nla_put_failure;
541
542 if (events & (1 << IPCT_PROTOINFO)
543 && ctnetlink_dump_protoinfo(skb, ct) < 0)
544 goto nla_put_failure;
545
546 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
547 && ctnetlink_dump_helpinfo(skb, ct) < 0)
548 goto nla_put_failure;
549
550 #ifdef CONFIG_NF_CONNTRACK_SECMARK
551 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
552 && ctnetlink_dump_secmark(skb, ct) < 0)
553 goto nla_put_failure;
554 #endif
555
556 if (events & (1 << IPCT_RELATED) &&
557 ctnetlink_dump_master(skb, ct) < 0)
558 goto nla_put_failure;
559
560 if (events & (1 << IPCT_NATSEQADJ) &&
561 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
562 goto nla_put_failure;
563 }
564
565 #ifdef CONFIG_NF_CONNTRACK_MARK
566 if ((events & (1 << IPCT_MARK) || ct->mark)
567 && ctnetlink_dump_mark(skb, ct) < 0)
568 goto nla_put_failure;
569 #endif
570 rcu_read_unlock();
571
572 nlmsg_end(skb, nlh);
573 err = nfnetlink_send(skb, net, item->pid, group, item->report,
574 GFP_ATOMIC);
575 if (err == -ENOBUFS || err == -EAGAIN)
576 return -ENOBUFS;
577
578 return 0;
579
580 nla_put_failure:
581 rcu_read_unlock();
582 nlmsg_cancel(skb, nlh);
583 nlmsg_failure:
584 kfree_skb(skb);
585 errout:
586 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
587 return -ENOBUFS;
588
589 return 0;
590 }
591 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
592
593 static int ctnetlink_done(struct netlink_callback *cb)
594 {
595 if (cb->args[1])
596 nf_ct_put((struct nf_conn *)cb->args[1]);
597 return 0;
598 }
599
600 static int
601 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
602 {
603 struct net *net = sock_net(skb->sk);
604 struct nf_conn *ct, *last;
605 struct nf_conntrack_tuple_hash *h;
606 struct hlist_nulls_node *n;
607 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
608 u_int8_t l3proto = nfmsg->nfgen_family;
609
610 rcu_read_lock();
611 last = (struct nf_conn *)cb->args[1];
612 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
613 restart:
614 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
615 hnnode) {
616 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
617 continue;
618 ct = nf_ct_tuplehash_to_ctrack(h);
619 if (!atomic_inc_not_zero(&ct->ct_general.use))
620 continue;
621 /* Dump entries of a given L3 protocol number.
622 * If it is not specified, ie. l3proto == 0,
623 * then dump everything. */
624 if (l3proto && nf_ct_l3num(ct) != l3proto)
625 goto releasect;
626 if (cb->args[1]) {
627 if (ct != last)
628 goto releasect;
629 cb->args[1] = 0;
630 }
631 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
632 cb->nlh->nlmsg_seq,
633 IPCTNL_MSG_CT_NEW, ct) < 0) {
634 cb->args[1] = (unsigned long)ct;
635 goto out;
636 }
637
638 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
639 IPCTNL_MSG_CT_GET_CTRZERO) {
640 struct nf_conn_counter *acct;
641
642 acct = nf_conn_acct_find(ct);
643 if (acct)
644 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
645 }
646 releasect:
647 nf_ct_put(ct);
648 }
649 if (cb->args[1]) {
650 cb->args[1] = 0;
651 goto restart;
652 }
653 }
654 out:
655 rcu_read_unlock();
656 if (last)
657 nf_ct_put(last);
658
659 return skb->len;
660 }
661
662 static inline int
663 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
664 {
665 struct nlattr *tb[CTA_IP_MAX+1];
666 struct nf_conntrack_l3proto *l3proto;
667 int ret = 0;
668
669 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
670
671 rcu_read_lock();
672 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
673
674 if (likely(l3proto->nlattr_to_tuple)) {
675 ret = nla_validate_nested(attr, CTA_IP_MAX,
676 l3proto->nla_policy);
677 if (ret == 0)
678 ret = l3proto->nlattr_to_tuple(tb, tuple);
679 }
680
681 rcu_read_unlock();
682
683 return ret;
684 }
685
686 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
687 [CTA_PROTO_NUM] = { .type = NLA_U8 },
688 };
689
690 static inline int
691 ctnetlink_parse_tuple_proto(struct nlattr *attr,
692 struct nf_conntrack_tuple *tuple)
693 {
694 struct nlattr *tb[CTA_PROTO_MAX+1];
695 struct nf_conntrack_l4proto *l4proto;
696 int ret = 0;
697
698 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
699 if (ret < 0)
700 return ret;
701
702 if (!tb[CTA_PROTO_NUM])
703 return -EINVAL;
704 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
705
706 rcu_read_lock();
707 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
708
709 if (likely(l4proto->nlattr_to_tuple)) {
710 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
711 l4proto->nla_policy);
712 if (ret == 0)
713 ret = l4proto->nlattr_to_tuple(tb, tuple);
714 }
715
716 rcu_read_unlock();
717
718 return ret;
719 }
720
721 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
722 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
723 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
724 };
725
726 static int
727 ctnetlink_parse_tuple(const struct nlattr * const cda[],
728 struct nf_conntrack_tuple *tuple,
729 enum ctattr_tuple type, u_int8_t l3num)
730 {
731 struct nlattr *tb[CTA_TUPLE_MAX+1];
732 int err;
733
734 memset(tuple, 0, sizeof(*tuple));
735
736 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
737
738 if (!tb[CTA_TUPLE_IP])
739 return -EINVAL;
740
741 tuple->src.l3num = l3num;
742
743 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
744 if (err < 0)
745 return err;
746
747 if (!tb[CTA_TUPLE_PROTO])
748 return -EINVAL;
749
750 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
751 if (err < 0)
752 return err;
753
754 /* orig and expect tuples get DIR_ORIGINAL */
755 if (type == CTA_TUPLE_REPLY)
756 tuple->dst.dir = IP_CT_DIR_REPLY;
757 else
758 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
759
760 return 0;
761 }
762
763 static int
764 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
765 {
766 if (attr)
767 #ifdef CONFIG_NF_CONNTRACK_ZONES
768 *zone = ntohs(nla_get_be16(attr));
769 #else
770 return -EOPNOTSUPP;
771 #endif
772 else
773 *zone = 0;
774
775 return 0;
776 }
777
778 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
779 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
780 };
781
782 static inline int
783 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
784 {
785 struct nlattr *tb[CTA_HELP_MAX+1];
786
787 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
788
789 if (!tb[CTA_HELP_NAME])
790 return -EINVAL;
791
792 *helper_name = nla_data(tb[CTA_HELP_NAME]);
793
794 return 0;
795 }
796
797 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
798 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
799 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
800 [CTA_STATUS] = { .type = NLA_U32 },
801 [CTA_PROTOINFO] = { .type = NLA_NESTED },
802 [CTA_HELP] = { .type = NLA_NESTED },
803 [CTA_NAT_SRC] = { .type = NLA_NESTED },
804 [CTA_TIMEOUT] = { .type = NLA_U32 },
805 [CTA_MARK] = { .type = NLA_U32 },
806 [CTA_ID] = { .type = NLA_U32 },
807 [CTA_NAT_DST] = { .type = NLA_NESTED },
808 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
809 [CTA_ZONE] = { .type = NLA_U16 },
810 };
811
812 static int
813 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
814 const struct nlmsghdr *nlh,
815 const struct nlattr * const cda[])
816 {
817 struct net *net = sock_net(ctnl);
818 struct nf_conntrack_tuple_hash *h;
819 struct nf_conntrack_tuple tuple;
820 struct nf_conn *ct;
821 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
822 u_int8_t u3 = nfmsg->nfgen_family;
823 u16 zone;
824 int err;
825
826 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
827 if (err < 0)
828 return err;
829
830 if (cda[CTA_TUPLE_ORIG])
831 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
832 else if (cda[CTA_TUPLE_REPLY])
833 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
834 else {
835 /* Flush the whole table */
836 nf_conntrack_flush_report(net,
837 NETLINK_CB(skb).pid,
838 nlmsg_report(nlh));
839 return 0;
840 }
841
842 if (err < 0)
843 return err;
844
845 h = nf_conntrack_find_get(net, zone, &tuple);
846 if (!h)
847 return -ENOENT;
848
849 ct = nf_ct_tuplehash_to_ctrack(h);
850
851 if (cda[CTA_ID]) {
852 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
853 if (id != (u32)(unsigned long)ct) {
854 nf_ct_put(ct);
855 return -ENOENT;
856 }
857 }
858
859 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
860 NETLINK_CB(skb).pid,
861 nlmsg_report(nlh)) < 0) {
862 nf_ct_delete_from_lists(ct);
863 /* we failed to report the event, try later */
864 nf_ct_insert_dying_list(ct);
865 nf_ct_put(ct);
866 return 0;
867 }
868
869 /* death_by_timeout would report the event again */
870 set_bit(IPS_DYING_BIT, &ct->status);
871
872 nf_ct_kill(ct);
873 nf_ct_put(ct);
874
875 return 0;
876 }
877
878 static int
879 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
880 const struct nlmsghdr *nlh,
881 const struct nlattr * const cda[])
882 {
883 struct net *net = sock_net(ctnl);
884 struct nf_conntrack_tuple_hash *h;
885 struct nf_conntrack_tuple tuple;
886 struct nf_conn *ct;
887 struct sk_buff *skb2 = NULL;
888 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
889 u_int8_t u3 = nfmsg->nfgen_family;
890 u16 zone;
891 int err;
892
893 if (nlh->nlmsg_flags & NLM_F_DUMP)
894 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
895 ctnetlink_done);
896
897 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
898 if (err < 0)
899 return err;
900
901 if (cda[CTA_TUPLE_ORIG])
902 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
903 else if (cda[CTA_TUPLE_REPLY])
904 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
905 else
906 return -EINVAL;
907
908 if (err < 0)
909 return err;
910
911 h = nf_conntrack_find_get(net, zone, &tuple);
912 if (!h)
913 return -ENOENT;
914
915 ct = nf_ct_tuplehash_to_ctrack(h);
916
917 err = -ENOMEM;
918 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
919 if (skb2 == NULL) {
920 nf_ct_put(ct);
921 return -ENOMEM;
922 }
923
924 rcu_read_lock();
925 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
926 IPCTNL_MSG_CT_NEW, ct);
927 rcu_read_unlock();
928 nf_ct_put(ct);
929 if (err <= 0)
930 goto free;
931
932 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
933 if (err < 0)
934 goto out;
935
936 return 0;
937
938 free:
939 kfree_skb(skb2);
940 out:
941 return err;
942 }
943
944 #ifdef CONFIG_NF_NAT_NEEDED
945 static int
946 ctnetlink_parse_nat_setup(struct nf_conn *ct,
947 enum nf_nat_manip_type manip,
948 const struct nlattr *attr)
949 {
950 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
951
952 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
953 if (!parse_nat_setup) {
954 #ifdef CONFIG_MODULES
955 rcu_read_unlock();
956 spin_unlock_bh(&nf_conntrack_lock);
957 nfnl_unlock();
958 if (request_module("nf-nat-ipv4") < 0) {
959 nfnl_lock();
960 spin_lock_bh(&nf_conntrack_lock);
961 rcu_read_lock();
962 return -EOPNOTSUPP;
963 }
964 nfnl_lock();
965 spin_lock_bh(&nf_conntrack_lock);
966 rcu_read_lock();
967 if (nfnetlink_parse_nat_setup_hook)
968 return -EAGAIN;
969 #endif
970 return -EOPNOTSUPP;
971 }
972
973 return parse_nat_setup(ct, manip, attr);
974 }
975 #endif
976
977 static int
978 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
979 {
980 unsigned long d;
981 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
982 d = ct->status ^ status;
983
984 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
985 /* unchangeable */
986 return -EBUSY;
987
988 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
989 /* SEEN_REPLY bit can only be set */
990 return -EBUSY;
991
992 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
993 /* ASSURED bit can only be set */
994 return -EBUSY;
995
996 /* Be careful here, modifying NAT bits can screw up things,
997 * so don't let users modify them directly if they don't pass
998 * nf_nat_range. */
999 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1000 return 0;
1001 }
1002
1003 static int
1004 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1005 {
1006 #ifdef CONFIG_NF_NAT_NEEDED
1007 int ret;
1008
1009 if (cda[CTA_NAT_DST]) {
1010 ret = ctnetlink_parse_nat_setup(ct,
1011 IP_NAT_MANIP_DST,
1012 cda[CTA_NAT_DST]);
1013 if (ret < 0)
1014 return ret;
1015 }
1016 if (cda[CTA_NAT_SRC]) {
1017 ret = ctnetlink_parse_nat_setup(ct,
1018 IP_NAT_MANIP_SRC,
1019 cda[CTA_NAT_SRC]);
1020 if (ret < 0)
1021 return ret;
1022 }
1023 return 0;
1024 #else
1025 return -EOPNOTSUPP;
1026 #endif
1027 }
1028
1029 static inline int
1030 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1031 {
1032 struct nf_conntrack_helper *helper;
1033 struct nf_conn_help *help = nfct_help(ct);
1034 char *helpname = NULL;
1035 int err;
1036
1037 /* don't change helper of sibling connections */
1038 if (ct->master)
1039 return -EBUSY;
1040
1041 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1042 if (err < 0)
1043 return err;
1044
1045 if (!strcmp(helpname, "")) {
1046 if (help && help->helper) {
1047 /* we had a helper before ... */
1048 nf_ct_remove_expectations(ct);
1049 rcu_assign_pointer(help->helper, NULL);
1050 }
1051
1052 return 0;
1053 }
1054
1055 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1056 nf_ct_protonum(ct));
1057 if (helper == NULL) {
1058 #ifdef CONFIG_MODULES
1059 spin_unlock_bh(&nf_conntrack_lock);
1060
1061 if (request_module("nfct-helper-%s", helpname) < 0) {
1062 spin_lock_bh(&nf_conntrack_lock);
1063 return -EOPNOTSUPP;
1064 }
1065
1066 spin_lock_bh(&nf_conntrack_lock);
1067 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1068 nf_ct_protonum(ct));
1069 if (helper)
1070 return -EAGAIN;
1071 #endif
1072 return -EOPNOTSUPP;
1073 }
1074
1075 if (help) {
1076 if (help->helper == helper)
1077 return 0;
1078 if (help->helper)
1079 return -EBUSY;
1080 /* need to zero data of old helper */
1081 memset(&help->help, 0, sizeof(help->help));
1082 } else {
1083 /* we cannot set a helper for an existing conntrack */
1084 return -EOPNOTSUPP;
1085 }
1086
1087 rcu_assign_pointer(help->helper, helper);
1088
1089 return 0;
1090 }
1091
1092 static inline int
1093 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1094 {
1095 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1096
1097 if (!del_timer(&ct->timeout))
1098 return -ETIME;
1099
1100 ct->timeout.expires = jiffies + timeout * HZ;
1101 add_timer(&ct->timeout);
1102
1103 return 0;
1104 }
1105
1106 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1107 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1108 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1109 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1110 };
1111
1112 static inline int
1113 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1114 {
1115 const struct nlattr *attr = cda[CTA_PROTOINFO];
1116 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1117 struct nf_conntrack_l4proto *l4proto;
1118 int err = 0;
1119
1120 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1121
1122 rcu_read_lock();
1123 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1124 if (l4proto->from_nlattr)
1125 err = l4proto->from_nlattr(tb, ct);
1126 rcu_read_unlock();
1127
1128 return err;
1129 }
1130
1131 #ifdef CONFIG_NF_NAT_NEEDED
1132 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1133 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1134 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1135 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1136 };
1137
1138 static inline int
1139 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1140 {
1141 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1142
1143 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1144
1145 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1146 return -EINVAL;
1147
1148 natseq->correction_pos =
1149 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1150
1151 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1152 return -EINVAL;
1153
1154 natseq->offset_before =
1155 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1156
1157 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1158 return -EINVAL;
1159
1160 natseq->offset_after =
1161 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1162
1163 return 0;
1164 }
1165
1166 static int
1167 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1168 const struct nlattr * const cda[])
1169 {
1170 int ret = 0;
1171 struct nf_conn_nat *nat = nfct_nat(ct);
1172
1173 if (!nat)
1174 return 0;
1175
1176 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1177 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1178 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1179 if (ret < 0)
1180 return ret;
1181
1182 ct->status |= IPS_SEQ_ADJUST;
1183 }
1184
1185 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1186 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1187 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1188 if (ret < 0)
1189 return ret;
1190
1191 ct->status |= IPS_SEQ_ADJUST;
1192 }
1193
1194 return 0;
1195 }
1196 #endif
1197
1198 static int
1199 ctnetlink_change_conntrack(struct nf_conn *ct,
1200 const struct nlattr * const cda[])
1201 {
1202 int err;
1203
1204 /* only allow NAT changes and master assignation for new conntracks */
1205 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1206 return -EOPNOTSUPP;
1207
1208 if (cda[CTA_HELP]) {
1209 err = ctnetlink_change_helper(ct, cda);
1210 if (err < 0)
1211 return err;
1212 }
1213
1214 if (cda[CTA_TIMEOUT]) {
1215 err = ctnetlink_change_timeout(ct, cda);
1216 if (err < 0)
1217 return err;
1218 }
1219
1220 if (cda[CTA_STATUS]) {
1221 err = ctnetlink_change_status(ct, cda);
1222 if (err < 0)
1223 return err;
1224 }
1225
1226 if (cda[CTA_PROTOINFO]) {
1227 err = ctnetlink_change_protoinfo(ct, cda);
1228 if (err < 0)
1229 return err;
1230 }
1231
1232 #if defined(CONFIG_NF_CONNTRACK_MARK)
1233 if (cda[CTA_MARK])
1234 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1235 #endif
1236
1237 #ifdef CONFIG_NF_NAT_NEEDED
1238 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1239 err = ctnetlink_change_nat_seq_adj(ct, cda);
1240 if (err < 0)
1241 return err;
1242 }
1243 #endif
1244
1245 return 0;
1246 }
1247
1248 static struct nf_conn *
1249 ctnetlink_create_conntrack(struct net *net, u16 zone,
1250 const struct nlattr * const cda[],
1251 struct nf_conntrack_tuple *otuple,
1252 struct nf_conntrack_tuple *rtuple,
1253 u8 u3)
1254 {
1255 struct nf_conn *ct;
1256 int err = -EINVAL;
1257 struct nf_conntrack_helper *helper;
1258
1259 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1260 if (IS_ERR(ct))
1261 return ERR_PTR(-ENOMEM);
1262
1263 if (!cda[CTA_TIMEOUT])
1264 goto err1;
1265 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1266
1267 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1268
1269 rcu_read_lock();
1270 if (cda[CTA_HELP]) {
1271 char *helpname = NULL;
1272
1273 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1274 if (err < 0)
1275 goto err2;
1276
1277 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1278 nf_ct_protonum(ct));
1279 if (helper == NULL) {
1280 rcu_read_unlock();
1281 #ifdef CONFIG_MODULES
1282 if (request_module("nfct-helper-%s", helpname) < 0) {
1283 err = -EOPNOTSUPP;
1284 goto err1;
1285 }
1286
1287 rcu_read_lock();
1288 helper = __nf_conntrack_helper_find(helpname,
1289 nf_ct_l3num(ct),
1290 nf_ct_protonum(ct));
1291 if (helper) {
1292 err = -EAGAIN;
1293 goto err2;
1294 }
1295 rcu_read_unlock();
1296 #endif
1297 err = -EOPNOTSUPP;
1298 goto err1;
1299 } else {
1300 struct nf_conn_help *help;
1301
1302 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1303 if (help == NULL) {
1304 err = -ENOMEM;
1305 goto err2;
1306 }
1307
1308 /* not in hash table yet so not strictly necessary */
1309 rcu_assign_pointer(help->helper, helper);
1310 }
1311 } else {
1312 /* try an implicit helper assignation */
1313 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1314 if (err < 0)
1315 goto err2;
1316 }
1317
1318 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1319 err = ctnetlink_change_nat(ct, cda);
1320 if (err < 0)
1321 goto err2;
1322 }
1323
1324 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1325 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1326 /* we must add conntrack extensions before confirmation. */
1327 ct->status |= IPS_CONFIRMED;
1328
1329 if (cda[CTA_STATUS]) {
1330 err = ctnetlink_change_status(ct, cda);
1331 if (err < 0)
1332 goto err2;
1333 }
1334
1335 #ifdef CONFIG_NF_NAT_NEEDED
1336 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1337 err = ctnetlink_change_nat_seq_adj(ct, cda);
1338 if (err < 0)
1339 goto err2;
1340 }
1341 #endif
1342
1343 if (cda[CTA_PROTOINFO]) {
1344 err = ctnetlink_change_protoinfo(ct, cda);
1345 if (err < 0)
1346 goto err2;
1347 }
1348
1349 #if defined(CONFIG_NF_CONNTRACK_MARK)
1350 if (cda[CTA_MARK])
1351 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1352 #endif
1353
1354 /* setup master conntrack: this is a confirmed expectation */
1355 if (cda[CTA_TUPLE_MASTER]) {
1356 struct nf_conntrack_tuple master;
1357 struct nf_conntrack_tuple_hash *master_h;
1358 struct nf_conn *master_ct;
1359
1360 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1361 if (err < 0)
1362 goto err2;
1363
1364 master_h = nf_conntrack_find_get(net, zone, &master);
1365 if (master_h == NULL) {
1366 err = -ENOENT;
1367 goto err2;
1368 }
1369 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1370 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1371 ct->master = master_ct;
1372 }
1373
1374 add_timer(&ct->timeout);
1375 nf_conntrack_hash_insert(ct);
1376 rcu_read_unlock();
1377
1378 return ct;
1379
1380 err2:
1381 rcu_read_unlock();
1382 err1:
1383 nf_conntrack_free(ct);
1384 return ERR_PTR(err);
1385 }
1386
1387 static int
1388 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1389 const struct nlmsghdr *nlh,
1390 const struct nlattr * const cda[])
1391 {
1392 struct net *net = sock_net(ctnl);
1393 struct nf_conntrack_tuple otuple, rtuple;
1394 struct nf_conntrack_tuple_hash *h = NULL;
1395 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1396 u_int8_t u3 = nfmsg->nfgen_family;
1397 u16 zone;
1398 int err;
1399
1400 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1401 if (err < 0)
1402 return err;
1403
1404 if (cda[CTA_TUPLE_ORIG]) {
1405 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1406 if (err < 0)
1407 return err;
1408 }
1409
1410 if (cda[CTA_TUPLE_REPLY]) {
1411 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1412 if (err < 0)
1413 return err;
1414 }
1415
1416 spin_lock_bh(&nf_conntrack_lock);
1417 if (cda[CTA_TUPLE_ORIG])
1418 h = __nf_conntrack_find(net, zone, &otuple);
1419 else if (cda[CTA_TUPLE_REPLY])
1420 h = __nf_conntrack_find(net, zone, &rtuple);
1421
1422 if (h == NULL) {
1423 err = -ENOENT;
1424 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1425 struct nf_conn *ct;
1426 enum ip_conntrack_events events;
1427
1428 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1429 &rtuple, u3);
1430 if (IS_ERR(ct)) {
1431 err = PTR_ERR(ct);
1432 goto out_unlock;
1433 }
1434 err = 0;
1435 nf_conntrack_get(&ct->ct_general);
1436 spin_unlock_bh(&nf_conntrack_lock);
1437 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1438 events = IPCT_RELATED;
1439 else
1440 events = IPCT_NEW;
1441
1442 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1443 (1 << IPCT_ASSURED) |
1444 (1 << IPCT_HELPER) |
1445 (1 << IPCT_PROTOINFO) |
1446 (1 << IPCT_NATSEQADJ) |
1447 (1 << IPCT_MARK) | events,
1448 ct, NETLINK_CB(skb).pid,
1449 nlmsg_report(nlh));
1450 nf_ct_put(ct);
1451 } else
1452 spin_unlock_bh(&nf_conntrack_lock);
1453
1454 return err;
1455 }
1456 /* implicit 'else' */
1457
1458 /* We manipulate the conntrack inside the global conntrack table lock,
1459 * so there's no need to increase the refcount */
1460 err = -EEXIST;
1461 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1462 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1463
1464 err = ctnetlink_change_conntrack(ct, cda);
1465 if (err == 0) {
1466 nf_conntrack_get(&ct->ct_general);
1467 spin_unlock_bh(&nf_conntrack_lock);
1468 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1469 (1 << IPCT_ASSURED) |
1470 (1 << IPCT_HELPER) |
1471 (1 << IPCT_PROTOINFO) |
1472 (1 << IPCT_NATSEQADJ) |
1473 (1 << IPCT_MARK),
1474 ct, NETLINK_CB(skb).pid,
1475 nlmsg_report(nlh));
1476 nf_ct_put(ct);
1477 } else
1478 spin_unlock_bh(&nf_conntrack_lock);
1479
1480 return err;
1481 }
1482
1483 out_unlock:
1484 spin_unlock_bh(&nf_conntrack_lock);
1485 return err;
1486 }
1487
1488 /***********************************************************************
1489 * EXPECT
1490 ***********************************************************************/
1491
1492 static inline int
1493 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1494 const struct nf_conntrack_tuple *tuple,
1495 enum ctattr_expect type)
1496 {
1497 struct nlattr *nest_parms;
1498
1499 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1500 if (!nest_parms)
1501 goto nla_put_failure;
1502 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1503 goto nla_put_failure;
1504 nla_nest_end(skb, nest_parms);
1505
1506 return 0;
1507
1508 nla_put_failure:
1509 return -1;
1510 }
1511
1512 static inline int
1513 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1514 const struct nf_conntrack_tuple *tuple,
1515 const struct nf_conntrack_tuple_mask *mask)
1516 {
1517 int ret;
1518 struct nf_conntrack_l3proto *l3proto;
1519 struct nf_conntrack_l4proto *l4proto;
1520 struct nf_conntrack_tuple m;
1521 struct nlattr *nest_parms;
1522
1523 memset(&m, 0xFF, sizeof(m));
1524 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1525 m.src.u.all = mask->src.u.all;
1526 m.dst.protonum = tuple->dst.protonum;
1527
1528 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1529 if (!nest_parms)
1530 goto nla_put_failure;
1531
1532 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1533 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1534
1535 if (unlikely(ret < 0))
1536 goto nla_put_failure;
1537
1538 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1539 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1540 if (unlikely(ret < 0))
1541 goto nla_put_failure;
1542
1543 nla_nest_end(skb, nest_parms);
1544
1545 return 0;
1546
1547 nla_put_failure:
1548 return -1;
1549 }
1550
1551 static int
1552 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1553 const struct nf_conntrack_expect *exp)
1554 {
1555 struct nf_conn *master = exp->master;
1556 struct nf_conntrack_helper *helper;
1557 long timeout = (exp->timeout.expires - jiffies) / HZ;
1558
1559 if (timeout < 0)
1560 timeout = 0;
1561
1562 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1563 goto nla_put_failure;
1564 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1565 goto nla_put_failure;
1566 if (ctnetlink_exp_dump_tuple(skb,
1567 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1568 CTA_EXPECT_MASTER) < 0)
1569 goto nla_put_failure;
1570
1571 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1572 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1573 helper = rcu_dereference(nfct_help(master)->helper);
1574 if (helper)
1575 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1576
1577 return 0;
1578
1579 nla_put_failure:
1580 return -1;
1581 }
1582
1583 static int
1584 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1585 int event, const struct nf_conntrack_expect *exp)
1586 {
1587 struct nlmsghdr *nlh;
1588 struct nfgenmsg *nfmsg;
1589 unsigned int flags = pid ? NLM_F_MULTI : 0;
1590
1591 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1592 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1593 if (nlh == NULL)
1594 goto nlmsg_failure;
1595
1596 nfmsg = nlmsg_data(nlh);
1597 nfmsg->nfgen_family = exp->tuple.src.l3num;
1598 nfmsg->version = NFNETLINK_V0;
1599 nfmsg->res_id = 0;
1600
1601 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1602 goto nla_put_failure;
1603
1604 nlmsg_end(skb, nlh);
1605 return skb->len;
1606
1607 nlmsg_failure:
1608 nla_put_failure:
1609 nlmsg_cancel(skb, nlh);
1610 return -1;
1611 }
1612
1613 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1614 static int
1615 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1616 {
1617 struct nf_conntrack_expect *exp = item->exp;
1618 struct net *net = nf_ct_exp_net(exp);
1619 struct nlmsghdr *nlh;
1620 struct nfgenmsg *nfmsg;
1621 struct sk_buff *skb;
1622 unsigned int type;
1623 int flags = 0;
1624
1625 if (events & (1 << IPEXP_NEW)) {
1626 type = IPCTNL_MSG_EXP_NEW;
1627 flags = NLM_F_CREATE|NLM_F_EXCL;
1628 } else
1629 return 0;
1630
1631 if (!item->report &&
1632 !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
1633 return 0;
1634
1635 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1636 if (skb == NULL)
1637 goto errout;
1638
1639 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1640 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1641 if (nlh == NULL)
1642 goto nlmsg_failure;
1643
1644 nfmsg = nlmsg_data(nlh);
1645 nfmsg->nfgen_family = exp->tuple.src.l3num;
1646 nfmsg->version = NFNETLINK_V0;
1647 nfmsg->res_id = 0;
1648
1649 rcu_read_lock();
1650 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1651 goto nla_put_failure;
1652 rcu_read_unlock();
1653
1654 nlmsg_end(skb, nlh);
1655 nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1656 item->report, GFP_ATOMIC);
1657 return 0;
1658
1659 nla_put_failure:
1660 rcu_read_unlock();
1661 nlmsg_cancel(skb, nlh);
1662 nlmsg_failure:
1663 kfree_skb(skb);
1664 errout:
1665 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1666 return 0;
1667 }
1668 #endif
1669 static int ctnetlink_exp_done(struct netlink_callback *cb)
1670 {
1671 if (cb->args[1])
1672 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1673 return 0;
1674 }
1675
1676 static int
1677 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1678 {
1679 struct net *net = sock_net(skb->sk);
1680 struct nf_conntrack_expect *exp, *last;
1681 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1682 struct hlist_node *n;
1683 u_int8_t l3proto = nfmsg->nfgen_family;
1684
1685 rcu_read_lock();
1686 last = (struct nf_conntrack_expect *)cb->args[1];
1687 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1688 restart:
1689 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1690 hnode) {
1691 if (l3proto && exp->tuple.src.l3num != l3proto)
1692 continue;
1693 if (cb->args[1]) {
1694 if (exp != last)
1695 continue;
1696 cb->args[1] = 0;
1697 }
1698 if (ctnetlink_exp_fill_info(skb,
1699 NETLINK_CB(cb->skb).pid,
1700 cb->nlh->nlmsg_seq,
1701 IPCTNL_MSG_EXP_NEW,
1702 exp) < 0) {
1703 if (!atomic_inc_not_zero(&exp->use))
1704 continue;
1705 cb->args[1] = (unsigned long)exp;
1706 goto out;
1707 }
1708 }
1709 if (cb->args[1]) {
1710 cb->args[1] = 0;
1711 goto restart;
1712 }
1713 }
1714 out:
1715 rcu_read_unlock();
1716 if (last)
1717 nf_ct_expect_put(last);
1718
1719 return skb->len;
1720 }
1721
1722 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1723 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1724 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1725 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1726 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1727 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1728 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1729 };
1730
1731 static int
1732 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1733 const struct nlmsghdr *nlh,
1734 const struct nlattr * const cda[])
1735 {
1736 struct net *net = sock_net(ctnl);
1737 struct nf_conntrack_tuple tuple;
1738 struct nf_conntrack_expect *exp;
1739 struct sk_buff *skb2;
1740 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1741 u_int8_t u3 = nfmsg->nfgen_family;
1742 u16 zone;
1743 int err;
1744
1745 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1746 return netlink_dump_start(ctnl, skb, nlh,
1747 ctnetlink_exp_dump_table,
1748 ctnetlink_exp_done);
1749 }
1750
1751 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1752 if (err < 0)
1753 return err;
1754
1755 if (cda[CTA_EXPECT_MASTER])
1756 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1757 else
1758 return -EINVAL;
1759
1760 if (err < 0)
1761 return err;
1762
1763 exp = nf_ct_expect_find_get(net, zone, &tuple);
1764 if (!exp)
1765 return -ENOENT;
1766
1767 if (cda[CTA_EXPECT_ID]) {
1768 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1769 if (ntohl(id) != (u32)(unsigned long)exp) {
1770 nf_ct_expect_put(exp);
1771 return -ENOENT;
1772 }
1773 }
1774
1775 err = -ENOMEM;
1776 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1777 if (skb2 == NULL)
1778 goto out;
1779
1780 rcu_read_lock();
1781 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1782 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1783 rcu_read_unlock();
1784 if (err <= 0)
1785 goto free;
1786
1787 nf_ct_expect_put(exp);
1788
1789 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1790
1791 free:
1792 kfree_skb(skb2);
1793 out:
1794 nf_ct_expect_put(exp);
1795 return err;
1796 }
1797
1798 static int
1799 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1800 const struct nlmsghdr *nlh,
1801 const struct nlattr * const cda[])
1802 {
1803 struct net *net = sock_net(ctnl);
1804 struct nf_conntrack_expect *exp;
1805 struct nf_conntrack_tuple tuple;
1806 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1807 struct hlist_node *n, *next;
1808 u_int8_t u3 = nfmsg->nfgen_family;
1809 unsigned int i;
1810 u16 zone;
1811 int err;
1812
1813 if (cda[CTA_EXPECT_TUPLE]) {
1814 /* delete a single expect by tuple */
1815 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1816 if (err < 0)
1817 return err;
1818
1819 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1820 if (err < 0)
1821 return err;
1822
1823 /* bump usage count to 2 */
1824 exp = nf_ct_expect_find_get(net, zone, &tuple);
1825 if (!exp)
1826 return -ENOENT;
1827
1828 if (cda[CTA_EXPECT_ID]) {
1829 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1830 if (ntohl(id) != (u32)(unsigned long)exp) {
1831 nf_ct_expect_put(exp);
1832 return -ENOENT;
1833 }
1834 }
1835
1836 /* after list removal, usage count == 1 */
1837 nf_ct_unexpect_related(exp);
1838 /* have to put what we 'get' above.
1839 * after this line usage count == 0 */
1840 nf_ct_expect_put(exp);
1841 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1842 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1843 struct nf_conn_help *m_help;
1844
1845 /* delete all expectations for this helper */
1846 spin_lock_bh(&nf_conntrack_lock);
1847 for (i = 0; i < nf_ct_expect_hsize; i++) {
1848 hlist_for_each_entry_safe(exp, n, next,
1849 &net->ct.expect_hash[i],
1850 hnode) {
1851 m_help = nfct_help(exp->master);
1852 if (!strcmp(m_help->helper->name, name) &&
1853 del_timer(&exp->timeout)) {
1854 nf_ct_unlink_expect(exp);
1855 nf_ct_expect_put(exp);
1856 }
1857 }
1858 }
1859 spin_unlock_bh(&nf_conntrack_lock);
1860 } else {
1861 /* This basically means we have to flush everything*/
1862 spin_lock_bh(&nf_conntrack_lock);
1863 for (i = 0; i < nf_ct_expect_hsize; i++) {
1864 hlist_for_each_entry_safe(exp, n, next,
1865 &net->ct.expect_hash[i],
1866 hnode) {
1867 if (del_timer(&exp->timeout)) {
1868 nf_ct_unlink_expect(exp);
1869 nf_ct_expect_put(exp);
1870 }
1871 }
1872 }
1873 spin_unlock_bh(&nf_conntrack_lock);
1874 }
1875
1876 return 0;
1877 }
1878 static int
1879 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1880 const struct nlattr * const cda[])
1881 {
1882 return -EOPNOTSUPP;
1883 }
1884
1885 static int
1886 ctnetlink_create_expect(struct net *net, u16 zone,
1887 const struct nlattr * const cda[],
1888 u_int8_t u3,
1889 u32 pid, int report)
1890 {
1891 struct nf_conntrack_tuple tuple, mask, master_tuple;
1892 struct nf_conntrack_tuple_hash *h = NULL;
1893 struct nf_conntrack_expect *exp;
1894 struct nf_conn *ct;
1895 struct nf_conn_help *help;
1896 int err = 0;
1897
1898 /* caller guarantees that those three CTA_EXPECT_* exist */
1899 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1900 if (err < 0)
1901 return err;
1902 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1903 if (err < 0)
1904 return err;
1905 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1906 if (err < 0)
1907 return err;
1908
1909 /* Look for master conntrack of this expectation */
1910 h = nf_conntrack_find_get(net, zone, &master_tuple);
1911 if (!h)
1912 return -ENOENT;
1913 ct = nf_ct_tuplehash_to_ctrack(h);
1914 help = nfct_help(ct);
1915
1916 if (!help || !help->helper) {
1917 /* such conntrack hasn't got any helper, abort */
1918 err = -EOPNOTSUPP;
1919 goto out;
1920 }
1921
1922 exp = nf_ct_expect_alloc(ct);
1923 if (!exp) {
1924 err = -ENOMEM;
1925 goto out;
1926 }
1927
1928 exp->class = 0;
1929 exp->expectfn = NULL;
1930 exp->flags = 0;
1931 exp->master = ct;
1932 exp->helper = NULL;
1933 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1934 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1935 exp->mask.src.u.all = mask.src.u.all;
1936
1937 err = nf_ct_expect_related_report(exp, pid, report);
1938 nf_ct_expect_put(exp);
1939
1940 out:
1941 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1942 return err;
1943 }
1944
1945 static int
1946 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1947 const struct nlmsghdr *nlh,
1948 const struct nlattr * const cda[])
1949 {
1950 struct net *net = sock_net(ctnl);
1951 struct nf_conntrack_tuple tuple;
1952 struct nf_conntrack_expect *exp;
1953 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1954 u_int8_t u3 = nfmsg->nfgen_family;
1955 u16 zone;
1956 int err;
1957
1958 if (!cda[CTA_EXPECT_TUPLE]
1959 || !cda[CTA_EXPECT_MASK]
1960 || !cda[CTA_EXPECT_MASTER])
1961 return -EINVAL;
1962
1963 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1964 if (err < 0)
1965 return err;
1966
1967 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1968 if (err < 0)
1969 return err;
1970
1971 spin_lock_bh(&nf_conntrack_lock);
1972 exp = __nf_ct_expect_find(net, zone, &tuple);
1973
1974 if (!exp) {
1975 spin_unlock_bh(&nf_conntrack_lock);
1976 err = -ENOENT;
1977 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1978 err = ctnetlink_create_expect(net, zone, cda,
1979 u3,
1980 NETLINK_CB(skb).pid,
1981 nlmsg_report(nlh));
1982 }
1983 return err;
1984 }
1985
1986 err = -EEXIST;
1987 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1988 err = ctnetlink_change_expect(exp, cda);
1989 spin_unlock_bh(&nf_conntrack_lock);
1990
1991 return err;
1992 }
1993
1994 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1995 static struct nf_ct_event_notifier ctnl_notifier = {
1996 .fcn = ctnetlink_conntrack_event,
1997 };
1998
1999 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2000 .fcn = ctnetlink_expect_event,
2001 };
2002 #endif
2003
2004 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2005 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2006 .attr_count = CTA_MAX,
2007 .policy = ct_nla_policy },
2008 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2009 .attr_count = CTA_MAX,
2010 .policy = ct_nla_policy },
2011 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2012 .attr_count = CTA_MAX,
2013 .policy = ct_nla_policy },
2014 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2015 .attr_count = CTA_MAX,
2016 .policy = ct_nla_policy },
2017 };
2018
2019 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2020 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2021 .attr_count = CTA_EXPECT_MAX,
2022 .policy = exp_nla_policy },
2023 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2024 .attr_count = CTA_EXPECT_MAX,
2025 .policy = exp_nla_policy },
2026 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2027 .attr_count = CTA_EXPECT_MAX,
2028 .policy = exp_nla_policy },
2029 };
2030
2031 static const struct nfnetlink_subsystem ctnl_subsys = {
2032 .name = "conntrack",
2033 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2034 .cb_count = IPCTNL_MSG_MAX,
2035 .cb = ctnl_cb,
2036 };
2037
2038 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2039 .name = "conntrack_expect",
2040 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2041 .cb_count = IPCTNL_MSG_EXP_MAX,
2042 .cb = ctnl_exp_cb,
2043 };
2044
2045 MODULE_ALIAS("ip_conntrack_netlink");
2046 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2047 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2048
2049 static int __init ctnetlink_init(void)
2050 {
2051 int ret;
2052
2053 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
2054 ret = nfnetlink_subsys_register(&ctnl_subsys);
2055 if (ret < 0) {
2056 printk("ctnetlink_init: cannot register with nfnetlink.\n");
2057 goto err_out;
2058 }
2059
2060 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2061 if (ret < 0) {
2062 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
2063 goto err_unreg_subsys;
2064 }
2065
2066 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2067 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2068 if (ret < 0) {
2069 printk("ctnetlink_init: cannot register notifier.\n");
2070 goto err_unreg_exp_subsys;
2071 }
2072
2073 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2074 if (ret < 0) {
2075 printk("ctnetlink_init: cannot expect register notifier.\n");
2076 goto err_unreg_notifier;
2077 }
2078 #endif
2079
2080 return 0;
2081
2082 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2083 err_unreg_notifier:
2084 nf_conntrack_unregister_notifier(&ctnl_notifier);
2085 err_unreg_exp_subsys:
2086 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2087 #endif
2088 err_unreg_subsys:
2089 nfnetlink_subsys_unregister(&ctnl_subsys);
2090 err_out:
2091 return ret;
2092 }
2093
2094 static void __exit ctnetlink_exit(void)
2095 {
2096 printk("ctnetlink: unregistering from nfnetlink.\n");
2097
2098 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2099 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2100 nf_conntrack_unregister_notifier(&ctnl_notifier);
2101 #endif
2102
2103 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2104 nfnetlink_subsys_unregister(&ctnl_subsys);
2105 return;
2106 }
2107
2108 module_init(ctnetlink_init);
2109 module_exit(ctnetlink_exit);
kernel source for telekom puls (alcatel/mediatek)