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