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TOMOYO Linux Cross Reference
Linux/net/netfilter/nf_conntrack_netlink.c

Version: ~ [ linux-5.3-rc5 ] ~ [ linux-5.2.9 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.67 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.139 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.72 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
  8  *
  9  * Initial connection tracking via netlink development funded and
 10  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
 11  *
 12  * Further development of this code funded by Astaro AG (http://www.astaro.com)
 13  *
 14  * This software may be used and distributed according to the terms
 15  * of the GNU General Public License, incorporated herein by reference.
 16  */
 17 
 18 #include <linux/init.h>
 19 #include <linux/module.h>
 20 #include <linux/kernel.h>
 21 #include <linux/rculist.h>
 22 #include <linux/rculist_nulls.h>
 23 #include <linux/types.h>
 24 #include <linux/timer.h>
 25 #include <linux/security.h>
 26 #include <linux/skbuff.h>
 27 #include <linux/errno.h>
 28 #include <linux/netlink.h>
 29 #include <linux/spinlock.h>
 30 #include <linux/interrupt.h>
 31 #include <linux/slab.h>
 32 
 33 #include <linux/netfilter.h>
 34 #include <net/netlink.h>
 35 #include <net/sock.h>
 36 #include <net/netfilter/nf_conntrack.h>
 37 #include <net/netfilter/nf_conntrack_core.h>
 38 #include <net/netfilter/nf_conntrack_expect.h>
 39 #include <net/netfilter/nf_conntrack_helper.h>
 40 #include <net/netfilter/nf_conntrack_seqadj.h>
 41 #include <net/netfilter/nf_conntrack_l3proto.h>
 42 #include <net/netfilter/nf_conntrack_l4proto.h>
 43 #include <net/netfilter/nf_conntrack_tuple.h>
 44 #include <net/netfilter/nf_conntrack_acct.h>
 45 #include <net/netfilter/nf_conntrack_zones.h>
 46 #include <net/netfilter/nf_conntrack_timestamp.h>
 47 #include <net/netfilter/nf_conntrack_labels.h>
 48 #ifdef CONFIG_NF_NAT_NEEDED
 49 #include <net/netfilter/nf_nat_core.h>
 50 #include <net/netfilter/nf_nat_l4proto.h>
 51 #include <net/netfilter/nf_nat_helper.h>
 52 #endif
 53 
 54 #include <linux/netfilter/nfnetlink.h>
 55 #include <linux/netfilter/nfnetlink_conntrack.h>
 56 
 57 MODULE_LICENSE("GPL");
 58 
 59 static char __initdata version[] = "0.93";
 60 
 61 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
 62                                        const struct nf_conntrack_tuple *tuple,
 63                                        struct nf_conntrack_l4proto *l4proto)
 64 {
 65         int ret = 0;
 66         struct nlattr *nest_parms;
 67 
 68         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
 69         if (!nest_parms)
 70                 goto nla_put_failure;
 71         if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
 72                 goto nla_put_failure;
 73 
 74         if (likely(l4proto->tuple_to_nlattr))
 75                 ret = l4proto->tuple_to_nlattr(skb, tuple);
 76 
 77         nla_nest_end(skb, nest_parms);
 78 
 79         return ret;
 80 
 81 nla_put_failure:
 82         return -1;
 83 }
 84 
 85 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
 86                                     const struct nf_conntrack_tuple *tuple,
 87                                     struct nf_conntrack_l3proto *l3proto)
 88 {
 89         int ret = 0;
 90         struct nlattr *nest_parms;
 91 
 92         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
 93         if (!nest_parms)
 94                 goto nla_put_failure;
 95 
 96         if (likely(l3proto->tuple_to_nlattr))
 97                 ret = l3proto->tuple_to_nlattr(skb, tuple);
 98 
 99         nla_nest_end(skb, nest_parms);
100 
101         return ret;
102 
103 nla_put_failure:
104         return -1;
105 }
106 
107 static int ctnetlink_dump_tuples(struct sk_buff *skb,
108                                  const struct nf_conntrack_tuple *tuple)
109 {
110         int ret;
111         struct nf_conntrack_l3proto *l3proto;
112         struct nf_conntrack_l4proto *l4proto;
113 
114         rcu_read_lock();
115         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
116         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
117 
118         if (ret >= 0) {
119                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
120                                                tuple->dst.protonum);
121                 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
122         }
123         rcu_read_unlock();
124         return ret;
125 }
126 
127 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
128                                   const struct nf_conntrack_zone *zone, int dir)
129 {
130         if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
131                 return 0;
132         if (nla_put_be16(skb, attrtype, htons(zone->id)))
133                 goto nla_put_failure;
134         return 0;
135 
136 nla_put_failure:
137         return -1;
138 }
139 
140 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
141 {
142         if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
143                 goto nla_put_failure;
144         return 0;
145 
146 nla_put_failure:
147         return -1;
148 }
149 
150 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
151 {
152         long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
153 
154         if (timeout < 0)
155                 timeout = 0;
156 
157         if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
158                 goto nla_put_failure;
159         return 0;
160 
161 nla_put_failure:
162         return -1;
163 }
164 
165 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
166 {
167         struct nf_conntrack_l4proto *l4proto;
168         struct nlattr *nest_proto;
169         int ret;
170 
171         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
172         if (!l4proto->to_nlattr)
173                 return 0;
174 
175         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
176         if (!nest_proto)
177                 goto nla_put_failure;
178 
179         ret = l4proto->to_nlattr(skb, nest_proto, ct);
180 
181         nla_nest_end(skb, nest_proto);
182 
183         return ret;
184 
185 nla_put_failure:
186         return -1;
187 }
188 
189 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
190                                    const struct nf_conn *ct)
191 {
192         struct nlattr *nest_helper;
193         const struct nf_conn_help *help = nfct_help(ct);
194         struct nf_conntrack_helper *helper;
195 
196         if (!help)
197                 return 0;
198 
199         helper = rcu_dereference(help->helper);
200         if (!helper)
201                 goto out;
202 
203         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
204         if (!nest_helper)
205                 goto nla_put_failure;
206         if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
207                 goto nla_put_failure;
208 
209         if (helper->to_nlattr)
210                 helper->to_nlattr(skb, ct);
211 
212         nla_nest_end(skb, nest_helper);
213 out:
214         return 0;
215 
216 nla_put_failure:
217         return -1;
218 }
219 
220 static int
221 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
222               enum ip_conntrack_dir dir, int type)
223 {
224         enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
225         struct nf_conn_counter *counter = acct->counter;
226         struct nlattr *nest_count;
227         u64 pkts, bytes;
228 
229         if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
230                 pkts = atomic64_xchg(&counter[dir].packets, 0);
231                 bytes = atomic64_xchg(&counter[dir].bytes, 0);
232         } else {
233                 pkts = atomic64_read(&counter[dir].packets);
234                 bytes = atomic64_read(&counter[dir].bytes);
235         }
236 
237         nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
238         if (!nest_count)
239                 goto nla_put_failure;
240 
241         if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
242                          CTA_COUNTERS_PAD) ||
243             nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
244                          CTA_COUNTERS_PAD))
245                 goto nla_put_failure;
246 
247         nla_nest_end(skb, nest_count);
248 
249         return 0;
250 
251 nla_put_failure:
252         return -1;
253 }
254 
255 static int
256 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
257 {
258         struct nf_conn_acct *acct = nf_conn_acct_find(ct);
259 
260         if (!acct)
261                 return 0;
262 
263         if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
264                 return -1;
265         if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
266                 return -1;
267 
268         return 0;
269 }
270 
271 static int
272 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
273 {
274         struct nlattr *nest_count;
275         const struct nf_conn_tstamp *tstamp;
276 
277         tstamp = nf_conn_tstamp_find(ct);
278         if (!tstamp)
279                 return 0;
280 
281         nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
282         if (!nest_count)
283                 goto nla_put_failure;
284 
285         if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
286                          CTA_TIMESTAMP_PAD) ||
287             (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
288                                                cpu_to_be64(tstamp->stop),
289                                                CTA_TIMESTAMP_PAD)))
290                 goto nla_put_failure;
291         nla_nest_end(skb, nest_count);
292 
293         return 0;
294 
295 nla_put_failure:
296         return -1;
297 }
298 
299 #ifdef CONFIG_NF_CONNTRACK_MARK
300 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
301 {
302         if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
303                 goto nla_put_failure;
304         return 0;
305 
306 nla_put_failure:
307         return -1;
308 }
309 #else
310 #define ctnetlink_dump_mark(a, b) (0)
311 #endif
312 
313 #ifdef CONFIG_NF_CONNTRACK_SECMARK
314 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
315 {
316         struct nlattr *nest_secctx;
317         int len, ret;
318         char *secctx;
319 
320         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
321         if (ret)
322                 return 0;
323 
324         ret = -1;
325         nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
326         if (!nest_secctx)
327                 goto nla_put_failure;
328 
329         if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
330                 goto nla_put_failure;
331         nla_nest_end(skb, nest_secctx);
332 
333         ret = 0;
334 nla_put_failure:
335         security_release_secctx(secctx, len);
336         return ret;
337 }
338 #else
339 #define ctnetlink_dump_secctx(a, b) (0)
340 #endif
341 
342 #ifdef CONFIG_NF_CONNTRACK_LABELS
343 static inline int ctnetlink_label_size(const struct nf_conn *ct)
344 {
345         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
346 
347         if (!labels)
348                 return 0;
349         return nla_total_size(sizeof(labels->bits));
350 }
351 
352 static int
353 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
354 {
355         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
356         unsigned int i;
357 
358         if (!labels)
359                 return 0;
360 
361         i = 0;
362         do {
363                 if (labels->bits[i] != 0)
364                         return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
365                                        labels->bits);
366                 i++;
367         } while (i < ARRAY_SIZE(labels->bits));
368 
369         return 0;
370 }
371 #else
372 #define ctnetlink_dump_labels(a, b) (0)
373 #define ctnetlink_label_size(a) (0)
374 #endif
375 
376 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
377 
378 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
379 {
380         struct nlattr *nest_parms;
381 
382         if (!(ct->status & IPS_EXPECTED))
383                 return 0;
384 
385         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
386         if (!nest_parms)
387                 goto nla_put_failure;
388         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
389                 goto nla_put_failure;
390         nla_nest_end(skb, nest_parms);
391 
392         return 0;
393 
394 nla_put_failure:
395         return -1;
396 }
397 
398 static int
399 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
400 {
401         struct nlattr *nest_parms;
402 
403         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
404         if (!nest_parms)
405                 goto nla_put_failure;
406 
407         if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
408                          htonl(seq->correction_pos)) ||
409             nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
410                          htonl(seq->offset_before)) ||
411             nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
412                          htonl(seq->offset_after)))
413                 goto nla_put_failure;
414 
415         nla_nest_end(skb, nest_parms);
416 
417         return 0;
418 
419 nla_put_failure:
420         return -1;
421 }
422 
423 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb,
424                                      const struct nf_conn *ct)
425 {
426         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
427         struct nf_ct_seqadj *seq;
428 
429         if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
430                 return 0;
431 
432         seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
433         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
434                 return -1;
435 
436         seq = &seqadj->seq[IP_CT_DIR_REPLY];
437         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
438                 return -1;
439 
440         return 0;
441 }
442 
443 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
444 {
445         if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
446                 goto nla_put_failure;
447         return 0;
448 
449 nla_put_failure:
450         return -1;
451 }
452 
453 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
454 {
455         if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
456                 goto nla_put_failure;
457         return 0;
458 
459 nla_put_failure:
460         return -1;
461 }
462 
463 static int
464 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
465                     struct nf_conn *ct)
466 {
467         const struct nf_conntrack_zone *zone;
468         struct nlmsghdr *nlh;
469         struct nfgenmsg *nfmsg;
470         struct nlattr *nest_parms;
471         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
472 
473         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
474         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
475         if (nlh == NULL)
476                 goto nlmsg_failure;
477 
478         nfmsg = nlmsg_data(nlh);
479         nfmsg->nfgen_family = nf_ct_l3num(ct);
480         nfmsg->version      = NFNETLINK_V0;
481         nfmsg->res_id       = 0;
482 
483         zone = nf_ct_zone(ct);
484 
485         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
486         if (!nest_parms)
487                 goto nla_put_failure;
488         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
489                 goto nla_put_failure;
490         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
491                                    NF_CT_ZONE_DIR_ORIG) < 0)
492                 goto nla_put_failure;
493         nla_nest_end(skb, nest_parms);
494 
495         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
496         if (!nest_parms)
497                 goto nla_put_failure;
498         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
499                 goto nla_put_failure;
500         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
501                                    NF_CT_ZONE_DIR_REPL) < 0)
502                 goto nla_put_failure;
503         nla_nest_end(skb, nest_parms);
504 
505         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
506                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
507                 goto nla_put_failure;
508 
509         if (ctnetlink_dump_status(skb, ct) < 0 ||
510             ctnetlink_dump_timeout(skb, ct) < 0 ||
511             ctnetlink_dump_acct(skb, ct, type) < 0 ||
512             ctnetlink_dump_timestamp(skb, ct) < 0 ||
513             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
514             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
515             ctnetlink_dump_mark(skb, ct) < 0 ||
516             ctnetlink_dump_secctx(skb, ct) < 0 ||
517             ctnetlink_dump_labels(skb, ct) < 0 ||
518             ctnetlink_dump_id(skb, ct) < 0 ||
519             ctnetlink_dump_use(skb, ct) < 0 ||
520             ctnetlink_dump_master(skb, ct) < 0 ||
521             ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
522                 goto nla_put_failure;
523 
524         nlmsg_end(skb, nlh);
525         return skb->len;
526 
527 nlmsg_failure:
528 nla_put_failure:
529         nlmsg_cancel(skb, nlh);
530         return -1;
531 }
532 
533 static inline size_t ctnetlink_proto_size(const struct nf_conn *ct)
534 {
535         struct nf_conntrack_l3proto *l3proto;
536         struct nf_conntrack_l4proto *l4proto;
537         size_t len = 0;
538 
539         rcu_read_lock();
540         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
541         len += l3proto->nla_size;
542 
543         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
544         len += l4proto->nla_size;
545         rcu_read_unlock();
546 
547         return len;
548 }
549 
550 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
551 {
552         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
553                 return 0;
554         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
555                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
556                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
557                ;
558 }
559 
560 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
561 {
562 #ifdef CONFIG_NF_CONNTRACK_SECMARK
563         int len, ret;
564 
565         ret = security_secid_to_secctx(ct->secmark, NULL, &len);
566         if (ret)
567                 return 0;
568 
569         return nla_total_size(0) /* CTA_SECCTX */
570                + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
571 #else
572         return 0;
573 #endif
574 }
575 
576 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
577 {
578 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
579         if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
580                 return 0;
581         return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
582 #else
583         return 0;
584 #endif
585 }
586 
587 #ifdef CONFIG_NF_CONNTRACK_EVENTS
588 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
589 {
590         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
591                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
592                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
593                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
594                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
595                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
596                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
597                + ctnetlink_acct_size(ct)
598                + ctnetlink_timestamp_size(ct)
599                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
600                + nla_total_size(0) /* CTA_PROTOINFO */
601                + nla_total_size(0) /* CTA_HELP */
602                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
603                + ctnetlink_secctx_size(ct)
604 #ifdef CONFIG_NF_NAT_NEEDED
605                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
606                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
607 #endif
608 #ifdef CONFIG_NF_CONNTRACK_MARK
609                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
610 #endif
611 #ifdef CONFIG_NF_CONNTRACK_ZONES
612                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
613 #endif
614                + ctnetlink_proto_size(ct)
615                + ctnetlink_label_size(ct)
616                ;
617 }
618 
619 static int
620 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
621 {
622         const struct nf_conntrack_zone *zone;
623         struct net *net;
624         struct nlmsghdr *nlh;
625         struct nfgenmsg *nfmsg;
626         struct nlattr *nest_parms;
627         struct nf_conn *ct = item->ct;
628         struct sk_buff *skb;
629         unsigned int type;
630         unsigned int flags = 0, group;
631         int err;
632 
633         /* ignore our fake conntrack entry */
634         if (nf_ct_is_untracked(ct))
635                 return 0;
636 
637         if (events & (1 << IPCT_DESTROY)) {
638                 type = IPCTNL_MSG_CT_DELETE;
639                 group = NFNLGRP_CONNTRACK_DESTROY;
640         } else  if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
641                 type = IPCTNL_MSG_CT_NEW;
642                 flags = NLM_F_CREATE|NLM_F_EXCL;
643                 group = NFNLGRP_CONNTRACK_NEW;
644         } else  if (events) {
645                 type = IPCTNL_MSG_CT_NEW;
646                 group = NFNLGRP_CONNTRACK_UPDATE;
647         } else
648                 return 0;
649 
650         net = nf_ct_net(ct);
651         if (!item->report && !nfnetlink_has_listeners(net, group))
652                 return 0;
653 
654         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
655         if (skb == NULL)
656                 goto errout;
657 
658         type |= NFNL_SUBSYS_CTNETLINK << 8;
659         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
660         if (nlh == NULL)
661                 goto nlmsg_failure;
662 
663         nfmsg = nlmsg_data(nlh);
664         nfmsg->nfgen_family = nf_ct_l3num(ct);
665         nfmsg->version  = NFNETLINK_V0;
666         nfmsg->res_id   = 0;
667 
668         rcu_read_lock();
669         zone = nf_ct_zone(ct);
670 
671         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
672         if (!nest_parms)
673                 goto nla_put_failure;
674         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
675                 goto nla_put_failure;
676         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
677                                    NF_CT_ZONE_DIR_ORIG) < 0)
678                 goto nla_put_failure;
679         nla_nest_end(skb, nest_parms);
680 
681         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
682         if (!nest_parms)
683                 goto nla_put_failure;
684         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
685                 goto nla_put_failure;
686         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
687                                    NF_CT_ZONE_DIR_REPL) < 0)
688                 goto nla_put_failure;
689         nla_nest_end(skb, nest_parms);
690 
691         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
692                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
693                 goto nla_put_failure;
694 
695         if (ctnetlink_dump_id(skb, ct) < 0)
696                 goto nla_put_failure;
697 
698         if (ctnetlink_dump_status(skb, ct) < 0)
699                 goto nla_put_failure;
700 
701         if (events & (1 << IPCT_DESTROY)) {
702                 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
703                     ctnetlink_dump_timestamp(skb, ct) < 0)
704                         goto nla_put_failure;
705         } else {
706                 if (ctnetlink_dump_timeout(skb, ct) < 0)
707                         goto nla_put_failure;
708 
709                 if (events & (1 << IPCT_PROTOINFO)
710                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
711                         goto nla_put_failure;
712 
713                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
714                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
715                         goto nla_put_failure;
716 
717 #ifdef CONFIG_NF_CONNTRACK_SECMARK
718                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
719                     && ctnetlink_dump_secctx(skb, ct) < 0)
720                         goto nla_put_failure;
721 #endif
722                 if (events & (1 << IPCT_LABEL) &&
723                      ctnetlink_dump_labels(skb, ct) < 0)
724                         goto nla_put_failure;
725 
726                 if (events & (1 << IPCT_RELATED) &&
727                     ctnetlink_dump_master(skb, ct) < 0)
728                         goto nla_put_failure;
729 
730                 if (events & (1 << IPCT_SEQADJ) &&
731                     ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
732                         goto nla_put_failure;
733         }
734 
735 #ifdef CONFIG_NF_CONNTRACK_MARK
736         if ((events & (1 << IPCT_MARK) || ct->mark)
737             && ctnetlink_dump_mark(skb, ct) < 0)
738                 goto nla_put_failure;
739 #endif
740         rcu_read_unlock();
741 
742         nlmsg_end(skb, nlh);
743         err = nfnetlink_send(skb, net, item->portid, group, item->report,
744                              GFP_ATOMIC);
745         if (err == -ENOBUFS || err == -EAGAIN)
746                 return -ENOBUFS;
747 
748         return 0;
749 
750 nla_put_failure:
751         rcu_read_unlock();
752         nlmsg_cancel(skb, nlh);
753 nlmsg_failure:
754         kfree_skb(skb);
755 errout:
756         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
757                 return -ENOBUFS;
758 
759         return 0;
760 }
761 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
762 
763 static int ctnetlink_done(struct netlink_callback *cb)
764 {
765         if (cb->args[1])
766                 nf_ct_put((struct nf_conn *)cb->args[1]);
767         kfree(cb->data);
768         return 0;
769 }
770 
771 struct ctnetlink_filter {
772         struct {
773                 u_int32_t val;
774                 u_int32_t mask;
775         } mark;
776 };
777 
778 static struct ctnetlink_filter *
779 ctnetlink_alloc_filter(const struct nlattr * const cda[])
780 {
781 #ifdef CONFIG_NF_CONNTRACK_MARK
782         struct ctnetlink_filter *filter;
783 
784         filter = kzalloc(sizeof(*filter), GFP_KERNEL);
785         if (filter == NULL)
786                 return ERR_PTR(-ENOMEM);
787 
788         filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
789         filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
790 
791         return filter;
792 #else
793         return ERR_PTR(-EOPNOTSUPP);
794 #endif
795 }
796 
797 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
798 {
799         struct ctnetlink_filter *filter = data;
800 
801         if (filter == NULL)
802                 return 1;
803 
804 #ifdef CONFIG_NF_CONNTRACK_MARK
805         if ((ct->mark & filter->mark.mask) == filter->mark.val)
806                 return 1;
807 #endif
808 
809         return 0;
810 }
811 
812 static int
813 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
814 {
815         struct net *net = sock_net(skb->sk);
816         struct nf_conn *ct, *last;
817         struct nf_conntrack_tuple_hash *h;
818         struct hlist_nulls_node *n;
819         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
820         u_int8_t l3proto = nfmsg->nfgen_family;
821         int res;
822         spinlock_t *lockp;
823 
824         last = (struct nf_conn *)cb->args[1];
825 
826         local_bh_disable();
827         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
828 restart:
829                 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
830                 nf_conntrack_lock(lockp);
831                 if (cb->args[0] >= nf_conntrack_htable_size) {
832                         spin_unlock(lockp);
833                         goto out;
834                 }
835                 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
836                                            hnnode) {
837                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
838                                 continue;
839                         ct = nf_ct_tuplehash_to_ctrack(h);
840                         if (!net_eq(net, nf_ct_net(ct)))
841                                 continue;
842 
843                         /* Dump entries of a given L3 protocol number.
844                          * If it is not specified, ie. l3proto == 0,
845                          * then dump everything. */
846                         if (l3proto && nf_ct_l3num(ct) != l3proto)
847                                 continue;
848                         if (cb->args[1]) {
849                                 if (ct != last)
850                                         continue;
851                                 cb->args[1] = 0;
852                         }
853                         if (!ctnetlink_filter_match(ct, cb->data))
854                                 continue;
855 
856                         rcu_read_lock();
857                         res =
858                         ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
859                                             cb->nlh->nlmsg_seq,
860                                             NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
861                                             ct);
862                         rcu_read_unlock();
863                         if (res < 0) {
864                                 nf_conntrack_get(&ct->ct_general);
865                                 cb->args[1] = (unsigned long)ct;
866                                 spin_unlock(lockp);
867                                 goto out;
868                         }
869                 }
870                 spin_unlock(lockp);
871                 if (cb->args[1]) {
872                         cb->args[1] = 0;
873                         goto restart;
874                 }
875         }
876 out:
877         local_bh_enable();
878         if (last)
879                 nf_ct_put(last);
880 
881         return skb->len;
882 }
883 
884 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
885                                     struct nf_conntrack_tuple *tuple)
886 {
887         struct nlattr *tb[CTA_IP_MAX+1];
888         struct nf_conntrack_l3proto *l3proto;
889         int ret = 0;
890 
891         ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
892         if (ret < 0)
893                 return ret;
894 
895         rcu_read_lock();
896         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
897 
898         if (likely(l3proto->nlattr_to_tuple)) {
899                 ret = nla_validate_nested(attr, CTA_IP_MAX,
900                                           l3proto->nla_policy);
901                 if (ret == 0)
902                         ret = l3proto->nlattr_to_tuple(tb, tuple);
903         }
904 
905         rcu_read_unlock();
906 
907         return ret;
908 }
909 
910 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
911         [CTA_PROTO_NUM] = { .type = NLA_U8 },
912 };
913 
914 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
915                                        struct nf_conntrack_tuple *tuple)
916 {
917         struct nlattr *tb[CTA_PROTO_MAX+1];
918         struct nf_conntrack_l4proto *l4proto;
919         int ret = 0;
920 
921         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
922         if (ret < 0)
923                 return ret;
924 
925         if (!tb[CTA_PROTO_NUM])
926                 return -EINVAL;
927         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
928 
929         rcu_read_lock();
930         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
931 
932         if (likely(l4proto->nlattr_to_tuple)) {
933                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
934                                           l4proto->nla_policy);
935                 if (ret == 0)
936                         ret = l4proto->nlattr_to_tuple(tb, tuple);
937         }
938 
939         rcu_read_unlock();
940 
941         return ret;
942 }
943 
944 static int
945 ctnetlink_parse_zone(const struct nlattr *attr,
946                      struct nf_conntrack_zone *zone)
947 {
948         nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
949                         NF_CT_DEFAULT_ZONE_DIR, 0);
950 #ifdef CONFIG_NF_CONNTRACK_ZONES
951         if (attr)
952                 zone->id = ntohs(nla_get_be16(attr));
953 #else
954         if (attr)
955                 return -EOPNOTSUPP;
956 #endif
957         return 0;
958 }
959 
960 static int
961 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
962                            struct nf_conntrack_zone *zone)
963 {
964         int ret;
965 
966         if (zone->id != NF_CT_DEFAULT_ZONE_ID)
967                 return -EINVAL;
968 
969         ret = ctnetlink_parse_zone(attr, zone);
970         if (ret < 0)
971                 return ret;
972 
973         if (type == CTA_TUPLE_REPLY)
974                 zone->dir = NF_CT_ZONE_DIR_REPL;
975         else
976                 zone->dir = NF_CT_ZONE_DIR_ORIG;
977 
978         return 0;
979 }
980 
981 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
982         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
983         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
984         [CTA_TUPLE_ZONE]        = { .type = NLA_U16 },
985 };
986 
987 static int
988 ctnetlink_parse_tuple(const struct nlattr * const cda[],
989                       struct nf_conntrack_tuple *tuple,
990                       enum ctattr_type type, u_int8_t l3num,
991                       struct nf_conntrack_zone *zone)
992 {
993         struct nlattr *tb[CTA_TUPLE_MAX+1];
994         int err;
995 
996         memset(tuple, 0, sizeof(*tuple));
997 
998         err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
999         if (err < 0)
1000                 return err;
1001 
1002         if (!tb[CTA_TUPLE_IP])
1003                 return -EINVAL;
1004 
1005         tuple->src.l3num = l3num;
1006 
1007         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1008         if (err < 0)
1009                 return err;
1010 
1011         if (!tb[CTA_TUPLE_PROTO])
1012                 return -EINVAL;
1013 
1014         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1015         if (err < 0)
1016                 return err;
1017 
1018         if (tb[CTA_TUPLE_ZONE]) {
1019                 if (!zone)
1020                         return -EINVAL;
1021 
1022                 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1023                                                  type, zone);
1024                 if (err < 0)
1025                         return err;
1026         }
1027 
1028         /* orig and expect tuples get DIR_ORIGINAL */
1029         if (type == CTA_TUPLE_REPLY)
1030                 tuple->dst.dir = IP_CT_DIR_REPLY;
1031         else
1032                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1033 
1034         return 0;
1035 }
1036 
1037 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1038         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING,
1039                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
1040 };
1041 
1042 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1043                                 struct nlattr **helpinfo)
1044 {
1045         int err;
1046         struct nlattr *tb[CTA_HELP_MAX+1];
1047 
1048         err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
1049         if (err < 0)
1050                 return err;
1051 
1052         if (!tb[CTA_HELP_NAME])
1053                 return -EINVAL;
1054 
1055         *helper_name = nla_data(tb[CTA_HELP_NAME]);
1056 
1057         if (tb[CTA_HELP_INFO])
1058                 *helpinfo = tb[CTA_HELP_INFO];
1059 
1060         return 0;
1061 }
1062 
1063 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1064         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
1065         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
1066         [CTA_STATUS]            = { .type = NLA_U32 },
1067         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
1068         [CTA_HELP]              = { .type = NLA_NESTED },
1069         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
1070         [CTA_TIMEOUT]           = { .type = NLA_U32 },
1071         [CTA_MARK]              = { .type = NLA_U32 },
1072         [CTA_ID]                = { .type = NLA_U32 },
1073         [CTA_NAT_DST]           = { .type = NLA_NESTED },
1074         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
1075         [CTA_NAT_SEQ_ADJ_ORIG]  = { .type = NLA_NESTED },
1076         [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1077         [CTA_ZONE]              = { .type = NLA_U16 },
1078         [CTA_MARK_MASK]         = { .type = NLA_U32 },
1079         [CTA_LABELS]            = { .type = NLA_BINARY,
1080                                     .len = NF_CT_LABELS_MAX_SIZE },
1081         [CTA_LABELS_MASK]       = { .type = NLA_BINARY,
1082                                     .len = NF_CT_LABELS_MAX_SIZE },
1083 };
1084 
1085 static int ctnetlink_flush_conntrack(struct net *net,
1086                                      const struct nlattr * const cda[],
1087                                      u32 portid, int report)
1088 {
1089         struct ctnetlink_filter *filter = NULL;
1090 
1091         if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1092                 filter = ctnetlink_alloc_filter(cda);
1093                 if (IS_ERR(filter))
1094                         return PTR_ERR(filter);
1095         }
1096 
1097         nf_ct_iterate_cleanup(net, ctnetlink_filter_match, filter,
1098                               portid, report);
1099         kfree(filter);
1100 
1101         return 0;
1102 }
1103 
1104 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1105                                    struct sk_buff *skb,
1106                                    const struct nlmsghdr *nlh,
1107                                    const struct nlattr * const cda[])
1108 {
1109         struct nf_conntrack_tuple_hash *h;
1110         struct nf_conntrack_tuple tuple;
1111         struct nf_conn *ct;
1112         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1113         u_int8_t u3 = nfmsg->nfgen_family;
1114         struct nf_conntrack_zone zone;
1115         int err;
1116 
1117         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1118         if (err < 0)
1119                 return err;
1120 
1121         if (cda[CTA_TUPLE_ORIG])
1122                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1123                                             u3, &zone);
1124         else if (cda[CTA_TUPLE_REPLY])
1125                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1126                                             u3, &zone);
1127         else {
1128                 return ctnetlink_flush_conntrack(net, cda,
1129                                                  NETLINK_CB(skb).portid,
1130                                                  nlmsg_report(nlh));
1131         }
1132 
1133         if (err < 0)
1134                 return err;
1135 
1136         h = nf_conntrack_find_get(net, &zone, &tuple);
1137         if (!h)
1138                 return -ENOENT;
1139 
1140         ct = nf_ct_tuplehash_to_ctrack(h);
1141 
1142         if (cda[CTA_ID]) {
1143                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1144                 if (id != (u32)(unsigned long)ct) {
1145                         nf_ct_put(ct);
1146                         return -ENOENT;
1147                 }
1148         }
1149 
1150         if (del_timer(&ct->timeout))
1151                 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1152 
1153         nf_ct_put(ct);
1154 
1155         return 0;
1156 }
1157 
1158 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1159                                    struct sk_buff *skb,
1160                                    const struct nlmsghdr *nlh,
1161                                    const struct nlattr * const cda[])
1162 {
1163         struct nf_conntrack_tuple_hash *h;
1164         struct nf_conntrack_tuple tuple;
1165         struct nf_conn *ct;
1166         struct sk_buff *skb2 = NULL;
1167         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1168         u_int8_t u3 = nfmsg->nfgen_family;
1169         struct nf_conntrack_zone zone;
1170         int err;
1171 
1172         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1173                 struct netlink_dump_control c = {
1174                         .dump = ctnetlink_dump_table,
1175                         .done = ctnetlink_done,
1176                 };
1177 
1178                 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1179                         struct ctnetlink_filter *filter;
1180 
1181                         filter = ctnetlink_alloc_filter(cda);
1182                         if (IS_ERR(filter))
1183                                 return PTR_ERR(filter);
1184 
1185                         c.data = filter;
1186                 }
1187                 return netlink_dump_start(ctnl, skb, nlh, &c);
1188         }
1189 
1190         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1191         if (err < 0)
1192                 return err;
1193 
1194         if (cda[CTA_TUPLE_ORIG])
1195                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1196                                             u3, &zone);
1197         else if (cda[CTA_TUPLE_REPLY])
1198                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1199                                             u3, &zone);
1200         else
1201                 return -EINVAL;
1202 
1203         if (err < 0)
1204                 return err;
1205 
1206         h = nf_conntrack_find_get(net, &zone, &tuple);
1207         if (!h)
1208                 return -ENOENT;
1209 
1210         ct = nf_ct_tuplehash_to_ctrack(h);
1211 
1212         err = -ENOMEM;
1213         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1214         if (skb2 == NULL) {
1215                 nf_ct_put(ct);
1216                 return -ENOMEM;
1217         }
1218 
1219         rcu_read_lock();
1220         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1221                                   NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1222         rcu_read_unlock();
1223         nf_ct_put(ct);
1224         if (err <= 0)
1225                 goto free;
1226 
1227         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1228         if (err < 0)
1229                 goto out;
1230 
1231         return 0;
1232 
1233 free:
1234         kfree_skb(skb2);
1235 out:
1236         /* this avoids a loop in nfnetlink. */
1237         return err == -EAGAIN ? -ENOBUFS : err;
1238 }
1239 
1240 static int ctnetlink_done_list(struct netlink_callback *cb)
1241 {
1242         if (cb->args[1])
1243                 nf_ct_put((struct nf_conn *)cb->args[1]);
1244         return 0;
1245 }
1246 
1247 static int
1248 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1249 {
1250         struct nf_conn *ct, *last;
1251         struct nf_conntrack_tuple_hash *h;
1252         struct hlist_nulls_node *n;
1253         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1254         u_int8_t l3proto = nfmsg->nfgen_family;
1255         int res;
1256         int cpu;
1257         struct hlist_nulls_head *list;
1258         struct net *net = sock_net(skb->sk);
1259 
1260         if (cb->args[2])
1261                 return 0;
1262 
1263         last = (struct nf_conn *)cb->args[1];
1264 
1265         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1266                 struct ct_pcpu *pcpu;
1267 
1268                 if (!cpu_possible(cpu))
1269                         continue;
1270 
1271                 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1272                 spin_lock_bh(&pcpu->lock);
1273                 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1274 restart:
1275                 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1276                         ct = nf_ct_tuplehash_to_ctrack(h);
1277                         if (l3proto && nf_ct_l3num(ct) != l3proto)
1278                                 continue;
1279                         if (cb->args[1]) {
1280                                 if (ct != last)
1281                                         continue;
1282                                 cb->args[1] = 0;
1283                         }
1284                         rcu_read_lock();
1285                         res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1286                                                   cb->nlh->nlmsg_seq,
1287                                                   NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1288                                                   ct);
1289                         rcu_read_unlock();
1290                         if (res < 0) {
1291                                 if (!atomic_inc_not_zero(&ct->ct_general.use))
1292                                         continue;
1293                                 cb->args[0] = cpu;
1294                                 cb->args[1] = (unsigned long)ct;
1295                                 spin_unlock_bh(&pcpu->lock);
1296                                 goto out;
1297                         }
1298                 }
1299                 if (cb->args[1]) {
1300                         cb->args[1] = 0;
1301                         goto restart;
1302                 }
1303                 spin_unlock_bh(&pcpu->lock);
1304         }
1305         cb->args[2] = 1;
1306 out:
1307         if (last)
1308                 nf_ct_put(last);
1309 
1310         return skb->len;
1311 }
1312 
1313 static int
1314 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1315 {
1316         return ctnetlink_dump_list(skb, cb, true);
1317 }
1318 
1319 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1320                                   struct sk_buff *skb,
1321                                   const struct nlmsghdr *nlh,
1322                                   const struct nlattr * const cda[])
1323 {
1324         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1325                 struct netlink_dump_control c = {
1326                         .dump = ctnetlink_dump_dying,
1327                         .done = ctnetlink_done_list,
1328                 };
1329                 return netlink_dump_start(ctnl, skb, nlh, &c);
1330         }
1331 
1332         return -EOPNOTSUPP;
1333 }
1334 
1335 static int
1336 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1337 {
1338         return ctnetlink_dump_list(skb, cb, false);
1339 }
1340 
1341 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1342                                         struct sk_buff *skb,
1343                                         const struct nlmsghdr *nlh,
1344                                         const struct nlattr * const cda[])
1345 {
1346         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1347                 struct netlink_dump_control c = {
1348                         .dump = ctnetlink_dump_unconfirmed,
1349                         .done = ctnetlink_done_list,
1350                 };
1351                 return netlink_dump_start(ctnl, skb, nlh, &c);
1352         }
1353 
1354         return -EOPNOTSUPP;
1355 }
1356 
1357 #ifdef CONFIG_NF_NAT_NEEDED
1358 static int
1359 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1360                           enum nf_nat_manip_type manip,
1361                           const struct nlattr *attr)
1362 {
1363         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1364         int err;
1365 
1366         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1367         if (!parse_nat_setup) {
1368 #ifdef CONFIG_MODULES
1369                 rcu_read_unlock();
1370                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1371                 if (request_module("nf-nat") < 0) {
1372                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1373                         rcu_read_lock();
1374                         return -EOPNOTSUPP;
1375                 }
1376                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1377                 rcu_read_lock();
1378                 if (nfnetlink_parse_nat_setup_hook)
1379                         return -EAGAIN;
1380 #endif
1381                 return -EOPNOTSUPP;
1382         }
1383 
1384         err = parse_nat_setup(ct, manip, attr);
1385         if (err == -EAGAIN) {
1386 #ifdef CONFIG_MODULES
1387                 rcu_read_unlock();
1388                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1389                 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1390                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1391                         rcu_read_lock();
1392                         return -EOPNOTSUPP;
1393                 }
1394                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1395                 rcu_read_lock();
1396 #else
1397                 err = -EOPNOTSUPP;
1398 #endif
1399         }
1400         return err;
1401 }
1402 #endif
1403 
1404 static int
1405 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1406 {
1407         unsigned long d;
1408         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1409         d = ct->status ^ status;
1410 
1411         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1412                 /* unchangeable */
1413                 return -EBUSY;
1414 
1415         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1416                 /* SEEN_REPLY bit can only be set */
1417                 return -EBUSY;
1418 
1419         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1420                 /* ASSURED bit can only be set */
1421                 return -EBUSY;
1422 
1423         /* Be careful here, modifying NAT bits can screw up things,
1424          * so don't let users modify them directly if they don't pass
1425          * nf_nat_range. */
1426         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1427         return 0;
1428 }
1429 
1430 static int
1431 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1432 {
1433 #ifdef CONFIG_NF_NAT_NEEDED
1434         int ret;
1435 
1436         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1437                 return 0;
1438 
1439         ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1440                                         cda[CTA_NAT_DST]);
1441         if (ret < 0)
1442                 return ret;
1443 
1444         ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1445                                         cda[CTA_NAT_SRC]);
1446         return ret;
1447 #else
1448         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1449                 return 0;
1450         return -EOPNOTSUPP;
1451 #endif
1452 }
1453 
1454 static int ctnetlink_change_helper(struct nf_conn *ct,
1455                                    const struct nlattr * const cda[])
1456 {
1457         struct nf_conntrack_helper *helper;
1458         struct nf_conn_help *help = nfct_help(ct);
1459         char *helpname = NULL;
1460         struct nlattr *helpinfo = NULL;
1461         int err;
1462 
1463         /* don't change helper of sibling connections */
1464         if (ct->master)
1465                 return -EBUSY;
1466 
1467         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1468         if (err < 0)
1469                 return err;
1470 
1471         if (!strcmp(helpname, "")) {
1472                 if (help && help->helper) {
1473                         /* we had a helper before ... */
1474                         nf_ct_remove_expectations(ct);
1475                         RCU_INIT_POINTER(help->helper, NULL);
1476                 }
1477 
1478                 return 0;
1479         }
1480 
1481         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1482                                             nf_ct_protonum(ct));
1483         if (helper == NULL) {
1484 #ifdef CONFIG_MODULES
1485                 spin_unlock_bh(&nf_conntrack_expect_lock);
1486 
1487                 if (request_module("nfct-helper-%s", helpname) < 0) {
1488                         spin_lock_bh(&nf_conntrack_expect_lock);
1489                         return -EOPNOTSUPP;
1490                 }
1491 
1492                 spin_lock_bh(&nf_conntrack_expect_lock);
1493                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1494                                                     nf_ct_protonum(ct));
1495                 if (helper)
1496                         return -EAGAIN;
1497 #endif
1498                 return -EOPNOTSUPP;
1499         }
1500 
1501         if (help) {
1502                 if (help->helper == helper) {
1503                         /* update private helper data if allowed. */
1504                         if (helper->from_nlattr)
1505                                 helper->from_nlattr(helpinfo, ct);
1506                         return 0;
1507                 } else
1508                         return -EBUSY;
1509         }
1510 
1511         /* we cannot set a helper for an existing conntrack */
1512         return -EOPNOTSUPP;
1513 }
1514 
1515 static int ctnetlink_change_timeout(struct nf_conn *ct,
1516                                     const struct nlattr * const cda[])
1517 {
1518         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1519 
1520         if (!del_timer(&ct->timeout))
1521                 return -ETIME;
1522 
1523         ct->timeout.expires = jiffies + timeout * HZ;
1524         add_timer(&ct->timeout);
1525 
1526         return 0;
1527 }
1528 
1529 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1530         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1531         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1532         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1533 };
1534 
1535 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1536                                       const struct nlattr * const cda[])
1537 {
1538         const struct nlattr *attr = cda[CTA_PROTOINFO];
1539         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1540         struct nf_conntrack_l4proto *l4proto;
1541         int err = 0;
1542 
1543         err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1544         if (err < 0)
1545                 return err;
1546 
1547         rcu_read_lock();
1548         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1549         if (l4proto->from_nlattr)
1550                 err = l4proto->from_nlattr(tb, ct);
1551         rcu_read_unlock();
1552 
1553         return err;
1554 }
1555 
1556 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1557         [CTA_SEQADJ_CORRECTION_POS]     = { .type = NLA_U32 },
1558         [CTA_SEQADJ_OFFSET_BEFORE]      = { .type = NLA_U32 },
1559         [CTA_SEQADJ_OFFSET_AFTER]       = { .type = NLA_U32 },
1560 };
1561 
1562 static int change_seq_adj(struct nf_ct_seqadj *seq,
1563                           const struct nlattr * const attr)
1564 {
1565         int err;
1566         struct nlattr *cda[CTA_SEQADJ_MAX+1];
1567 
1568         err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1569         if (err < 0)
1570                 return err;
1571 
1572         if (!cda[CTA_SEQADJ_CORRECTION_POS])
1573                 return -EINVAL;
1574 
1575         seq->correction_pos =
1576                 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1577 
1578         if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1579                 return -EINVAL;
1580 
1581         seq->offset_before =
1582                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1583 
1584         if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1585                 return -EINVAL;
1586 
1587         seq->offset_after =
1588                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1589 
1590         return 0;
1591 }
1592 
1593 static int
1594 ctnetlink_change_seq_adj(struct nf_conn *ct,
1595                          const struct nlattr * const cda[])
1596 {
1597         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1598         int ret = 0;
1599 
1600         if (!seqadj)
1601                 return 0;
1602 
1603         if (cda[CTA_SEQ_ADJ_ORIG]) {
1604                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1605                                      cda[CTA_SEQ_ADJ_ORIG]);
1606                 if (ret < 0)
1607                         return ret;
1608 
1609                 ct->status |= IPS_SEQ_ADJUST;
1610         }
1611 
1612         if (cda[CTA_SEQ_ADJ_REPLY]) {
1613                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1614                                      cda[CTA_SEQ_ADJ_REPLY]);
1615                 if (ret < 0)
1616                         return ret;
1617 
1618                 ct->status |= IPS_SEQ_ADJUST;
1619         }
1620 
1621         return 0;
1622 }
1623 
1624 static int
1625 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1626 {
1627 #ifdef CONFIG_NF_CONNTRACK_LABELS
1628         size_t len = nla_len(cda[CTA_LABELS]);
1629         const void *mask = cda[CTA_LABELS_MASK];
1630 
1631         if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1632                 return -EINVAL;
1633 
1634         if (mask) {
1635                 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1636                     nla_len(cda[CTA_LABELS_MASK]) != len)
1637                         return -EINVAL;
1638                 mask = nla_data(cda[CTA_LABELS_MASK]);
1639         }
1640 
1641         len /= sizeof(u32);
1642 
1643         return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1644 #else
1645         return -EOPNOTSUPP;
1646 #endif
1647 }
1648 
1649 static int
1650 ctnetlink_change_conntrack(struct nf_conn *ct,
1651                            const struct nlattr * const cda[])
1652 {
1653         int err;
1654 
1655         /* only allow NAT changes and master assignation for new conntracks */
1656         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1657                 return -EOPNOTSUPP;
1658 
1659         if (cda[CTA_HELP]) {
1660                 err = ctnetlink_change_helper(ct, cda);
1661                 if (err < 0)
1662                         return err;
1663         }
1664 
1665         if (cda[CTA_TIMEOUT]) {
1666                 err = ctnetlink_change_timeout(ct, cda);
1667                 if (err < 0)
1668                         return err;
1669         }
1670 
1671         if (cda[CTA_STATUS]) {
1672                 err = ctnetlink_change_status(ct, cda);
1673                 if (err < 0)
1674                         return err;
1675         }
1676 
1677         if (cda[CTA_PROTOINFO]) {
1678                 err = ctnetlink_change_protoinfo(ct, cda);
1679                 if (err < 0)
1680                         return err;
1681         }
1682 
1683 #if defined(CONFIG_NF_CONNTRACK_MARK)
1684         if (cda[CTA_MARK])
1685                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1686 #endif
1687 
1688         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1689                 err = ctnetlink_change_seq_adj(ct, cda);
1690                 if (err < 0)
1691                         return err;
1692         }
1693 
1694         if (cda[CTA_LABELS]) {
1695                 err = ctnetlink_attach_labels(ct, cda);
1696                 if (err < 0)
1697                         return err;
1698         }
1699 
1700         return 0;
1701 }
1702 
1703 static struct nf_conn *
1704 ctnetlink_create_conntrack(struct net *net,
1705                            const struct nf_conntrack_zone *zone,
1706                            const struct nlattr * const cda[],
1707                            struct nf_conntrack_tuple *otuple,
1708                            struct nf_conntrack_tuple *rtuple,
1709                            u8 u3)
1710 {
1711         struct nf_conn *ct;
1712         int err = -EINVAL;
1713         struct nf_conntrack_helper *helper;
1714         struct nf_conn_tstamp *tstamp;
1715 
1716         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1717         if (IS_ERR(ct))
1718                 return ERR_PTR(-ENOMEM);
1719 
1720         if (!cda[CTA_TIMEOUT])
1721                 goto err1;
1722         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1723 
1724         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1725 
1726         rcu_read_lock();
1727         if (cda[CTA_HELP]) {
1728                 char *helpname = NULL;
1729                 struct nlattr *helpinfo = NULL;
1730 
1731                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1732                 if (err < 0)
1733                         goto err2;
1734 
1735                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1736                                                     nf_ct_protonum(ct));
1737                 if (helper == NULL) {
1738                         rcu_read_unlock();
1739 #ifdef CONFIG_MODULES
1740                         if (request_module("nfct-helper-%s", helpname) < 0) {
1741                                 err = -EOPNOTSUPP;
1742                                 goto err1;
1743                         }
1744 
1745                         rcu_read_lock();
1746                         helper = __nf_conntrack_helper_find(helpname,
1747                                                             nf_ct_l3num(ct),
1748                                                             nf_ct_protonum(ct));
1749                         if (helper) {
1750                                 err = -EAGAIN;
1751                                 goto err2;
1752                         }
1753                         rcu_read_unlock();
1754 #endif
1755                         err = -EOPNOTSUPP;
1756                         goto err1;
1757                 } else {
1758                         struct nf_conn_help *help;
1759 
1760                         help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1761                         if (help == NULL) {
1762                                 err = -ENOMEM;
1763                                 goto err2;
1764                         }
1765                         /* set private helper data if allowed. */
1766                         if (helper->from_nlattr)
1767                                 helper->from_nlattr(helpinfo, ct);
1768 
1769                         /* not in hash table yet so not strictly necessary */
1770                         RCU_INIT_POINTER(help->helper, helper);
1771                 }
1772         } else {
1773                 /* try an implicit helper assignation */
1774                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1775                 if (err < 0)
1776                         goto err2;
1777         }
1778 
1779         err = ctnetlink_setup_nat(ct, cda);
1780         if (err < 0)
1781                 goto err2;
1782 
1783         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1784         nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1785         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1786         nf_ct_labels_ext_add(ct);
1787 
1788         /* we must add conntrack extensions before confirmation. */
1789         ct->status |= IPS_CONFIRMED;
1790 
1791         if (cda[CTA_STATUS]) {
1792                 err = ctnetlink_change_status(ct, cda);
1793                 if (err < 0)
1794                         goto err2;
1795         }
1796 
1797         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1798                 err = ctnetlink_change_seq_adj(ct, cda);
1799                 if (err < 0)
1800                         goto err2;
1801         }
1802 
1803         memset(&ct->proto, 0, sizeof(ct->proto));
1804         if (cda[CTA_PROTOINFO]) {
1805                 err = ctnetlink_change_protoinfo(ct, cda);
1806                 if (err < 0)
1807                         goto err2;
1808         }
1809 
1810 #if defined(CONFIG_NF_CONNTRACK_MARK)
1811         if (cda[CTA_MARK])
1812                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1813 #endif
1814 
1815         /* setup master conntrack: this is a confirmed expectation */
1816         if (cda[CTA_TUPLE_MASTER]) {
1817                 struct nf_conntrack_tuple master;
1818                 struct nf_conntrack_tuple_hash *master_h;
1819                 struct nf_conn *master_ct;
1820 
1821                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
1822                                             u3, NULL);
1823                 if (err < 0)
1824                         goto err2;
1825 
1826                 master_h = nf_conntrack_find_get(net, zone, &master);
1827                 if (master_h == NULL) {
1828                         err = -ENOENT;
1829                         goto err2;
1830                 }
1831                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1832                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1833                 ct->master = master_ct;
1834         }
1835         tstamp = nf_conn_tstamp_find(ct);
1836         if (tstamp)
1837                 tstamp->start = ktime_get_real_ns();
1838 
1839         err = nf_conntrack_hash_check_insert(ct);
1840         if (err < 0)
1841                 goto err2;
1842 
1843         rcu_read_unlock();
1844 
1845         return ct;
1846 
1847 err2:
1848         rcu_read_unlock();
1849 err1:
1850         nf_conntrack_free(ct);
1851         return ERR_PTR(err);
1852 }
1853 
1854 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
1855                                    struct sk_buff *skb,
1856                                    const struct nlmsghdr *nlh,
1857                                    const struct nlattr * const cda[])
1858 {
1859         struct nf_conntrack_tuple otuple, rtuple;
1860         struct nf_conntrack_tuple_hash *h = NULL;
1861         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1862         struct nf_conn *ct;
1863         u_int8_t u3 = nfmsg->nfgen_family;
1864         struct nf_conntrack_zone zone;
1865         int err;
1866 
1867         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1868         if (err < 0)
1869                 return err;
1870 
1871         if (cda[CTA_TUPLE_ORIG]) {
1872                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
1873                                             u3, &zone);
1874                 if (err < 0)
1875                         return err;
1876         }
1877 
1878         if (cda[CTA_TUPLE_REPLY]) {
1879                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
1880                                             u3, &zone);
1881                 if (err < 0)
1882                         return err;
1883         }
1884 
1885         if (cda[CTA_TUPLE_ORIG])
1886                 h = nf_conntrack_find_get(net, &zone, &otuple);
1887         else if (cda[CTA_TUPLE_REPLY])
1888                 h = nf_conntrack_find_get(net, &zone, &rtuple);
1889 
1890         if (h == NULL) {
1891                 err = -ENOENT;
1892                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1893                         enum ip_conntrack_events events;
1894 
1895                         if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1896                                 return -EINVAL;
1897                         if (otuple.dst.protonum != rtuple.dst.protonum)
1898                                 return -EINVAL;
1899 
1900                         ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
1901                                                         &rtuple, u3);
1902                         if (IS_ERR(ct))
1903                                 return PTR_ERR(ct);
1904 
1905                         err = 0;
1906                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1907                                 events = IPCT_RELATED;
1908                         else
1909                                 events = IPCT_NEW;
1910 
1911                         if (cda[CTA_LABELS] &&
1912                             ctnetlink_attach_labels(ct, cda) == 0)
1913                                 events |= (1 << IPCT_LABEL);
1914 
1915                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1916                                                       (1 << IPCT_ASSURED) |
1917                                                       (1 << IPCT_HELPER) |
1918                                                       (1 << IPCT_PROTOINFO) |
1919                                                       (1 << IPCT_SEQADJ) |
1920                                                       (1 << IPCT_MARK) | events,
1921                                                       ct, NETLINK_CB(skb).portid,
1922                                                       nlmsg_report(nlh));
1923                         nf_ct_put(ct);
1924                 }
1925 
1926                 return err;
1927         }
1928         /* implicit 'else' */
1929 
1930         err = -EEXIST;
1931         ct = nf_ct_tuplehash_to_ctrack(h);
1932         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1933                 spin_lock_bh(&nf_conntrack_expect_lock);
1934                 err = ctnetlink_change_conntrack(ct, cda);
1935                 spin_unlock_bh(&nf_conntrack_expect_lock);
1936                 if (err == 0) {
1937                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1938                                                       (1 << IPCT_ASSURED) |
1939                                                       (1 << IPCT_HELPER) |
1940                                                       (1 << IPCT_LABEL) |
1941                                                       (1 << IPCT_PROTOINFO) |
1942                                                       (1 << IPCT_SEQADJ) |
1943                                                       (1 << IPCT_MARK),
1944                                                       ct, NETLINK_CB(skb).portid,
1945                                                       nlmsg_report(nlh));
1946                 }
1947         }
1948 
1949         nf_ct_put(ct);
1950         return err;
1951 }
1952 
1953 static int
1954 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1955                                 __u16 cpu, const struct ip_conntrack_stat *st)
1956 {
1957         struct nlmsghdr *nlh;
1958         struct nfgenmsg *nfmsg;
1959         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1960 
1961         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1962         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1963         if (nlh == NULL)
1964                 goto nlmsg_failure;
1965 
1966         nfmsg = nlmsg_data(nlh);
1967         nfmsg->nfgen_family = AF_UNSPEC;
1968         nfmsg->version      = NFNETLINK_V0;
1969         nfmsg->res_id       = htons(cpu);
1970 
1971         if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1972             nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1973             nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1974             nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1975             nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1976             nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1977             nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1978             nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1979             nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1980                                 htonl(st->insert_failed)) ||
1981             nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1982             nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1983             nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1984             nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1985                                 htonl(st->search_restart)))
1986                 goto nla_put_failure;
1987 
1988         nlmsg_end(skb, nlh);
1989         return skb->len;
1990 
1991 nla_put_failure:
1992 nlmsg_failure:
1993         nlmsg_cancel(skb, nlh);
1994         return -1;
1995 }
1996 
1997 static int
1998 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1999 {
2000         int cpu;
2001         struct net *net = sock_net(skb->sk);
2002 
2003         if (cb->args[0] == nr_cpu_ids)
2004                 return 0;
2005 
2006         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2007                 const struct ip_conntrack_stat *st;
2008 
2009                 if (!cpu_possible(cpu))
2010                         continue;
2011 
2012                 st = per_cpu_ptr(net->ct.stat, cpu);
2013                 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2014                                                     NETLINK_CB(cb->skb).portid,
2015                                                     cb->nlh->nlmsg_seq,
2016                                                     cpu, st) < 0)
2017                                 break;
2018         }
2019         cb->args[0] = cpu;
2020 
2021         return skb->len;
2022 }
2023 
2024 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2025                                  struct sk_buff *skb,
2026                                  const struct nlmsghdr *nlh,
2027                                  const struct nlattr * const cda[])
2028 {
2029         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2030                 struct netlink_dump_control c = {
2031                         .dump = ctnetlink_ct_stat_cpu_dump,
2032                 };
2033                 return netlink_dump_start(ctnl, skb, nlh, &c);
2034         }
2035 
2036         return 0;
2037 }
2038 
2039 static int
2040 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2041                             struct net *net)
2042 {
2043         struct nlmsghdr *nlh;
2044         struct nfgenmsg *nfmsg;
2045         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2046         unsigned int nr_conntracks = atomic_read(&net->ct.count);
2047 
2048         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
2049         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2050         if (nlh == NULL)
2051                 goto nlmsg_failure;
2052 
2053         nfmsg = nlmsg_data(nlh);
2054         nfmsg->nfgen_family = AF_UNSPEC;
2055         nfmsg->version      = NFNETLINK_V0;
2056         nfmsg->res_id       = 0;
2057 
2058         if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2059                 goto nla_put_failure;
2060 
2061         nlmsg_end(skb, nlh);
2062         return skb->len;
2063 
2064 nla_put_failure:
2065 nlmsg_failure:
2066         nlmsg_cancel(skb, nlh);
2067         return -1;
2068 }
2069 
2070 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2071                              struct sk_buff *skb, const struct nlmsghdr *nlh,
2072                              const struct nlattr * const cda[])
2073 {
2074         struct sk_buff *skb2;
2075         int err;
2076 
2077         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2078         if (skb2 == NULL)
2079                 return -ENOMEM;
2080 
2081         err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2082                                           nlh->nlmsg_seq,
2083                                           NFNL_MSG_TYPE(nlh->nlmsg_type),
2084                                           sock_net(skb->sk));
2085         if (err <= 0)
2086                 goto free;
2087 
2088         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2089         if (err < 0)
2090                 goto out;
2091 
2092         return 0;
2093 
2094 free:
2095         kfree_skb(skb2);
2096 out:
2097         /* this avoids a loop in nfnetlink. */
2098         return err == -EAGAIN ? -ENOBUFS : err;
2099 }
2100 
2101 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2102         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
2103         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
2104         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
2105         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
2106         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
2107         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING,
2108                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
2109         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
2110         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
2111         [CTA_EXPECT_CLASS]      = { .type = NLA_U32 },
2112         [CTA_EXPECT_NAT]        = { .type = NLA_NESTED },
2113         [CTA_EXPECT_FN]         = { .type = NLA_NUL_STRING },
2114 };
2115 
2116 static struct nf_conntrack_expect *
2117 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2118                        struct nf_conntrack_helper *helper,
2119                        struct nf_conntrack_tuple *tuple,
2120                        struct nf_conntrack_tuple *mask);
2121 
2122 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2123 static size_t
2124 ctnetlink_glue_build_size(const struct nf_conn *ct)
2125 {
2126         return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2127                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2128                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2129                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2130                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2131                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2132                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2133                + nla_total_size(0) /* CTA_PROTOINFO */
2134                + nla_total_size(0) /* CTA_HELP */
2135                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2136                + ctnetlink_secctx_size(ct)
2137 #ifdef CONFIG_NF_NAT_NEEDED
2138                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2139                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2140 #endif
2141 #ifdef CONFIG_NF_CONNTRACK_MARK
2142                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2143 #endif
2144 #ifdef CONFIG_NF_CONNTRACK_ZONES
2145                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2146 #endif
2147                + ctnetlink_proto_size(ct)
2148                ;
2149 }
2150 
2151 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2152                                              enum ip_conntrack_info *ctinfo)
2153 {
2154         struct nf_conn *ct;
2155 
2156         ct = nf_ct_get(skb, ctinfo);
2157         if (ct && nf_ct_is_untracked(ct))
2158                 ct = NULL;
2159 
2160         return ct;
2161 }
2162 
2163 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2164 {
2165         const struct nf_conntrack_zone *zone;
2166         struct nlattr *nest_parms;
2167 
2168         rcu_read_lock();
2169         zone = nf_ct_zone(ct);
2170 
2171         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2172         if (!nest_parms)
2173                 goto nla_put_failure;
2174         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2175                 goto nla_put_failure;
2176         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2177                                    NF_CT_ZONE_DIR_ORIG) < 0)
2178                 goto nla_put_failure;
2179         nla_nest_end(skb, nest_parms);
2180 
2181         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2182         if (!nest_parms)
2183                 goto nla_put_failure;
2184         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2185                 goto nla_put_failure;
2186         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2187                                    NF_CT_ZONE_DIR_REPL) < 0)
2188                 goto nla_put_failure;
2189         nla_nest_end(skb, nest_parms);
2190 
2191         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2192                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
2193                 goto nla_put_failure;
2194 
2195         if (ctnetlink_dump_id(skb, ct) < 0)
2196                 goto nla_put_failure;
2197 
2198         if (ctnetlink_dump_status(skb, ct) < 0)
2199                 goto nla_put_failure;
2200 
2201         if (ctnetlink_dump_timeout(skb, ct) < 0)
2202                 goto nla_put_failure;
2203 
2204         if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2205                 goto nla_put_failure;
2206 
2207         if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2208                 goto nla_put_failure;
2209 
2210 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2211         if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2212                 goto nla_put_failure;
2213 #endif
2214         if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2215                 goto nla_put_failure;
2216 
2217         if ((ct->status & IPS_SEQ_ADJUST) &&
2218             ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2219                 goto nla_put_failure;
2220 
2221 #ifdef CONFIG_NF_CONNTRACK_MARK
2222         if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2223                 goto nla_put_failure;
2224 #endif
2225         if (ctnetlink_dump_labels(skb, ct) < 0)
2226                 goto nla_put_failure;
2227         rcu_read_unlock();
2228         return 0;
2229 
2230 nla_put_failure:
2231         rcu_read_unlock();
2232         return -ENOSPC;
2233 }
2234 
2235 static int
2236 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2237                      enum ip_conntrack_info ctinfo,
2238                      u_int16_t ct_attr, u_int16_t ct_info_attr)
2239 {
2240         struct nlattr *nest_parms;
2241 
2242         nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
2243         if (!nest_parms)
2244                 goto nla_put_failure;
2245 
2246         if (__ctnetlink_glue_build(skb, ct) < 0)
2247                 goto nla_put_failure;
2248 
2249         nla_nest_end(skb, nest_parms);
2250 
2251         if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2252                 goto nla_put_failure;
2253 
2254         return 0;
2255 
2256 nla_put_failure:
2257         return -ENOSPC;
2258 }
2259 
2260 static int
2261 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2262 {
2263         int err;
2264 
2265         if (cda[CTA_TIMEOUT]) {
2266                 err = ctnetlink_change_timeout(ct, cda);
2267                 if (err < 0)
2268                         return err;
2269         }
2270         if (cda[CTA_STATUS]) {
2271                 err = ctnetlink_change_status(ct, cda);
2272                 if (err < 0)
2273                         return err;
2274         }
2275         if (cda[CTA_HELP]) {
2276                 err = ctnetlink_change_helper(ct, cda);
2277                 if (err < 0)
2278                         return err;
2279         }
2280         if (cda[CTA_LABELS]) {
2281                 err = ctnetlink_attach_labels(ct, cda);
2282                 if (err < 0)
2283                         return err;
2284         }
2285 #if defined(CONFIG_NF_CONNTRACK_MARK)
2286         if (cda[CTA_MARK]) {
2287                 u32 mask = 0, mark, newmark;
2288                 if (cda[CTA_MARK_MASK])
2289                         mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2290 
2291                 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2292                 newmark = (ct->mark & mask) ^ mark;
2293                 if (newmark != ct->mark)
2294                         ct->mark = newmark;
2295         }
2296 #endif
2297         return 0;
2298 }
2299 
2300 static int
2301 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2302 {
2303         struct nlattr *cda[CTA_MAX+1];
2304         int ret;
2305 
2306         ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2307         if (ret < 0)
2308                 return ret;
2309 
2310         spin_lock_bh(&nf_conntrack_expect_lock);
2311         ret = ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2312         spin_unlock_bh(&nf_conntrack_expect_lock);
2313 
2314         return ret;
2315 }
2316 
2317 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2318                                     const struct nf_conn *ct,
2319                                     struct nf_conntrack_tuple *tuple,
2320                                     struct nf_conntrack_tuple *mask)
2321 {
2322         int err;
2323 
2324         err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2325                                     nf_ct_l3num(ct), NULL);
2326         if (err < 0)
2327                 return err;
2328 
2329         return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2330                                      nf_ct_l3num(ct), NULL);
2331 }
2332 
2333 static int
2334 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2335                              u32 portid, u32 report)
2336 {
2337         struct nlattr *cda[CTA_EXPECT_MAX+1];
2338         struct nf_conntrack_tuple tuple, mask;
2339         struct nf_conntrack_helper *helper = NULL;
2340         struct nf_conntrack_expect *exp;
2341         int err;
2342 
2343         err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2344         if (err < 0)
2345                 return err;
2346 
2347         err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2348                                        ct, &tuple, &mask);
2349         if (err < 0)
2350                 return err;
2351 
2352         if (cda[CTA_EXPECT_HELP_NAME]) {
2353                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2354 
2355                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2356                                                     nf_ct_protonum(ct));
2357                 if (helper == NULL)
2358                         return -EOPNOTSUPP;
2359         }
2360 
2361         exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2362                                      helper, &tuple, &mask);
2363         if (IS_ERR(exp))
2364                 return PTR_ERR(exp);
2365 
2366         err = nf_ct_expect_related_report(exp, portid, report);
2367         nf_ct_expect_put(exp);
2368         return err;
2369 }
2370 
2371 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2372                                   enum ip_conntrack_info ctinfo, int diff)
2373 {
2374         if (!(ct->status & IPS_NAT_MASK))
2375                 return;
2376 
2377         nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2378 }
2379 
2380 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2381         .get_ct         = ctnetlink_glue_get_ct,
2382         .build_size     = ctnetlink_glue_build_size,
2383         .build          = ctnetlink_glue_build,
2384         .parse          = ctnetlink_glue_parse,
2385         .attach_expect  = ctnetlink_glue_attach_expect,
2386         .seq_adjust     = ctnetlink_glue_seqadj,
2387 };
2388 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2389 
2390 /***********************************************************************
2391  * EXPECT
2392  ***********************************************************************/
2393 
2394 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2395                                     const struct nf_conntrack_tuple *tuple,
2396                                     enum ctattr_expect type)
2397 {
2398         struct nlattr *nest_parms;
2399 
2400         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2401         if (!nest_parms)
2402                 goto nla_put_failure;
2403         if (ctnetlink_dump_tuples(skb, tuple) < 0)
2404                 goto nla_put_failure;
2405         nla_nest_end(skb, nest_parms);
2406 
2407         return 0;
2408 
2409 nla_put_failure:
2410         return -1;
2411 }
2412 
2413 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2414                                    const struct nf_conntrack_tuple *tuple,
2415                                    const struct nf_conntrack_tuple_mask *mask)
2416 {
2417         int ret;
2418         struct nf_conntrack_l3proto *l3proto;
2419         struct nf_conntrack_l4proto *l4proto;
2420         struct nf_conntrack_tuple m;
2421         struct nlattr *nest_parms;
2422 
2423         memset(&m, 0xFF, sizeof(m));
2424         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2425         m.src.u.all = mask->src.u.all;
2426         m.dst.protonum = tuple->dst.protonum;
2427 
2428         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2429         if (!nest_parms)
2430                 goto nla_put_failure;
2431 
2432         rcu_read_lock();
2433         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2434         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2435         if (ret >= 0) {
2436                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2437                                                tuple->dst.protonum);
2438         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2439         }
2440         rcu_read_unlock();
2441 
2442         if (unlikely(ret < 0))
2443                 goto nla_put_failure;
2444 
2445         nla_nest_end(skb, nest_parms);
2446 
2447         return 0;
2448 
2449 nla_put_failure:
2450         return -1;
2451 }
2452 
2453 static const union nf_inet_addr any_addr;
2454 
2455 static int
2456 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2457                           const struct nf_conntrack_expect *exp)
2458 {
2459         struct nf_conn *master = exp->master;
2460         long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2461         struct nf_conn_help *help;
2462 #ifdef CONFIG_NF_NAT_NEEDED
2463         struct nlattr *nest_parms;
2464         struct nf_conntrack_tuple nat_tuple = {};
2465 #endif
2466         struct nf_ct_helper_expectfn *expfn;
2467 
2468         if (timeout < 0)
2469                 timeout = 0;
2470 
2471         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2472                 goto nla_put_failure;
2473         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2474                 goto nla_put_failure;
2475         if (ctnetlink_exp_dump_tuple(skb,
2476                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2477                                  CTA_EXPECT_MASTER) < 0)
2478                 goto nla_put_failure;
2479 
2480 #ifdef CONFIG_NF_NAT_NEEDED
2481         if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2482             exp->saved_proto.all) {
2483                 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2484                 if (!nest_parms)
2485                         goto nla_put_failure;
2486 
2487                 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2488                         goto nla_put_failure;
2489 
2490                 nat_tuple.src.l3num = nf_ct_l3num(master);
2491                 nat_tuple.src.u3 = exp->saved_addr;
2492                 nat_tuple.dst.protonum = nf_ct_protonum(master);
2493                 nat_tuple.src.u = exp->saved_proto;
2494 
2495                 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2496                                                 CTA_EXPECT_NAT_TUPLE) < 0)
2497                         goto nla_put_failure;
2498                 nla_nest_end(skb, nest_parms);
2499         }
2500 #endif
2501         if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2502             nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2503             nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2504             nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2505                 goto nla_put_failure;
2506         help = nfct_help(master);
2507         if (help) {
2508                 struct nf_conntrack_helper *helper;
2509 
2510                 helper = rcu_dereference(help->helper);
2511                 if (helper &&
2512                     nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2513                         goto nla_put_failure;
2514         }
2515         expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2516         if (expfn != NULL &&
2517             nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2518                 goto nla_put_failure;
2519 
2520         return 0;
2521 
2522 nla_put_failure:
2523         return -1;
2524 }
2525 
2526 static int
2527 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2528                         int event, const struct nf_conntrack_expect *exp)
2529 {
2530         struct nlmsghdr *nlh;
2531         struct nfgenmsg *nfmsg;
2532         unsigned int flags = portid ? NLM_F_MULTI : 0;
2533 
2534         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2535         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2536         if (nlh == NULL)
2537                 goto nlmsg_failure;
2538 
2539         nfmsg = nlmsg_data(nlh);
2540         nfmsg->nfgen_family = exp->tuple.src.l3num;
2541         nfmsg->version      = NFNETLINK_V0;
2542         nfmsg->res_id       = 0;
2543 
2544         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2545                 goto nla_put_failure;
2546 
2547         nlmsg_end(skb, nlh);
2548         return skb->len;
2549 
2550 nlmsg_failure:
2551 nla_put_failure:
2552         nlmsg_cancel(skb, nlh);
2553         return -1;
2554 }
2555 
2556 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2557 static int
2558 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2559 {
2560         struct nf_conntrack_expect *exp = item->exp;
2561         struct net *net = nf_ct_exp_net(exp);
2562         struct nlmsghdr *nlh;
2563         struct nfgenmsg *nfmsg;
2564         struct sk_buff *skb;
2565         unsigned int type, group;
2566         int flags = 0;
2567 
2568         if (events & (1 << IPEXP_DESTROY)) {
2569                 type = IPCTNL_MSG_EXP_DELETE;
2570                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2571         } else if (events & (1 << IPEXP_NEW)) {
2572                 type = IPCTNL_MSG_EXP_NEW;
2573                 flags = NLM_F_CREATE|NLM_F_EXCL;
2574                 group = NFNLGRP_CONNTRACK_EXP_NEW;
2575         } else
2576                 return 0;
2577 
2578         if (!item->report && !nfnetlink_has_listeners(net, group))
2579                 return 0;
2580 
2581         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2582         if (skb == NULL)
2583                 goto errout;
2584 
2585         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2586         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2587         if (nlh == NULL)
2588                 goto nlmsg_failure;
2589 
2590         nfmsg = nlmsg_data(nlh);
2591         nfmsg->nfgen_family = exp->tuple.src.l3num;
2592         nfmsg->version      = NFNETLINK_V0;
2593         nfmsg->res_id       = 0;
2594 
2595         rcu_read_lock();
2596         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2597                 goto nla_put_failure;
2598         rcu_read_unlock();
2599 
2600         nlmsg_end(skb, nlh);
2601         nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2602         return 0;
2603 
2604 nla_put_failure:
2605         rcu_read_unlock();
2606         nlmsg_cancel(skb, nlh);
2607 nlmsg_failure:
2608         kfree_skb(skb);
2609 errout:
2610         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2611         return 0;
2612 }
2613 #endif
2614 static int ctnetlink_exp_done(struct netlink_callback *cb)
2615 {
2616         if (cb->args[1])
2617                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2618         return 0;
2619 }
2620 
2621 static int
2622 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2623 {
2624         struct net *net = sock_net(skb->sk);
2625         struct nf_conntrack_expect *exp, *last;
2626         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2627         u_int8_t l3proto = nfmsg->nfgen_family;
2628 
2629         rcu_read_lock();
2630         last = (struct nf_conntrack_expect *)cb->args[1];
2631         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2632 restart:
2633                 hlist_for_each_entry(exp, &nf_ct_expect_hash[cb->args[0]],
2634                                      hnode) {
2635                         if (l3proto && exp->tuple.src.l3num != l3proto)
2636                                 continue;
2637 
2638                         if (!net_eq(nf_ct_net(exp->master), net))
2639                                 continue;
2640 
2641                         if (cb->args[1]) {
2642                                 if (exp != last)
2643                                         continue;
2644                                 cb->args[1] = 0;
2645                         }
2646                         if (ctnetlink_exp_fill_info(skb,
2647                                                     NETLINK_CB(cb->skb).portid,
2648                                                     cb->nlh->nlmsg_seq,
2649                                                     IPCTNL_MSG_EXP_NEW,
2650                                                     exp) < 0) {
2651                                 if (!atomic_inc_not_zero(&exp->use))
2652                                         continue;
2653                                 cb->args[1] = (unsigned long)exp;
2654                                 goto out;
2655                         }
2656                 }
2657                 if (cb->args[1]) {
2658                         cb->args[1] = 0;
2659                         goto restart;
2660                 }
2661         }
2662 out:
2663         rcu_read_unlock();
2664         if (last)
2665                 nf_ct_expect_put(last);
2666 
2667         return skb->len;
2668 }
2669 
2670 static int
2671 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2672 {
2673         struct nf_conntrack_expect *exp, *last;
2674         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2675         struct nf_conn *ct = cb->data;
2676         struct nf_conn_help *help = nfct_help(ct);
2677         u_int8_t l3proto = nfmsg->nfgen_family;
2678 
2679         if (cb->args[0])
2680                 return 0;
2681 
2682         rcu_read_lock();
2683         last = (struct nf_conntrack_expect *)cb->args[1];
2684 restart:
2685         hlist_for_each_entry(exp, &help->expectations, lnode) {
2686                 if (l3proto && exp->tuple.src.l3num != l3proto)
2687                         continue;
2688                 if (cb->args[1]) {
2689                         if (exp != last)
2690                                 continue;
2691                         cb->args[1] = 0;
2692                 }
2693                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2694                                             cb->nlh->nlmsg_seq,
2695                                             IPCTNL_MSG_EXP_NEW,
2696                                             exp) < 0) {
2697                         if (!atomic_inc_not_zero(&exp->use))
2698                                 continue;
2699                         cb->args[1] = (unsigned long)exp;
2700                         goto out;
2701                 }
2702         }
2703         if (cb->args[1]) {
2704                 cb->args[1] = 0;
2705                 goto restart;
2706         }
2707         cb->args[0] = 1;
2708 out:
2709         rcu_read_unlock();
2710         if (last)
2711                 nf_ct_expect_put(last);
2712 
2713         return skb->len;
2714 }
2715 
2716 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2717                                  struct sk_buff *skb,
2718                                  const struct nlmsghdr *nlh,
2719                                  const struct nlattr * const cda[])
2720 {
2721         int err;
2722         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2723         u_int8_t u3 = nfmsg->nfgen_family;
2724         struct nf_conntrack_tuple tuple;
2725         struct nf_conntrack_tuple_hash *h;
2726         struct nf_conn *ct;
2727         struct nf_conntrack_zone zone;
2728         struct netlink_dump_control c = {
2729                 .dump = ctnetlink_exp_ct_dump_table,
2730                 .done = ctnetlink_exp_done,
2731         };
2732 
2733         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2734                                     u3, NULL);
2735         if (err < 0)
2736                 return err;
2737 
2738         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2739         if (err < 0)
2740                 return err;
2741 
2742         h = nf_conntrack_find_get(net, &zone, &tuple);
2743         if (!h)
2744                 return -ENOENT;
2745 
2746         ct = nf_ct_tuplehash_to_ctrack(h);
2747         c.data = ct;
2748 
2749         err = netlink_dump_start(ctnl, skb, nlh, &c);
2750         nf_ct_put(ct);
2751 
2752         return err;
2753 }
2754 
2755 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
2756                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
2757                                 const struct nlattr * const cda[])
2758 {
2759         struct nf_conntrack_tuple tuple;
2760         struct nf_conntrack_expect *exp;
2761         struct sk_buff *skb2;
2762         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2763         u_int8_t u3 = nfmsg->nfgen_family;
2764         struct nf_conntrack_zone zone;
2765         int err;
2766 
2767         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2768                 if (cda[CTA_EXPECT_MASTER])
2769                         return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda);
2770                 else {
2771                         struct netlink_dump_control c = {
2772                                 .dump = ctnetlink_exp_dump_table,
2773                                 .done = ctnetlink_exp_done,
2774                         };
2775                         return netlink_dump_start(ctnl, skb, nlh, &c);
2776                 }
2777         }
2778 
2779         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2780         if (err < 0)
2781                 return err;
2782 
2783         if (cda[CTA_EXPECT_TUPLE])
2784                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2785                                             u3, NULL);
2786         else if (cda[CTA_EXPECT_MASTER])
2787                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2788                                             u3, NULL);
2789         else
2790                 return -EINVAL;
2791 
2792         if (err < 0)
2793                 return err;
2794 
2795         exp = nf_ct_expect_find_get(net, &zone, &tuple);
2796         if (!exp)
2797                 return -ENOENT;
2798 
2799         if (cda[CTA_EXPECT_ID]) {
2800                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2801                 if (ntohl(id) != (u32)(unsigned long)exp) {
2802                         nf_ct_expect_put(exp);
2803                         return -ENOENT;
2804                 }
2805         }
2806 
2807         err = -ENOMEM;
2808         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2809         if (skb2 == NULL) {
2810                 nf_ct_expect_put(exp);
2811                 goto out;
2812         }
2813 
2814         rcu_read_lock();
2815         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2816                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2817         rcu_read_unlock();
2818         nf_ct_expect_put(exp);
2819         if (err <= 0)
2820                 goto free;
2821 
2822         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2823         if (err < 0)
2824                 goto out;
2825 
2826         return 0;
2827 
2828 free:
2829         kfree_skb(skb2);
2830 out:
2831         /* this avoids a loop in nfnetlink. */
2832         return err == -EAGAIN ? -ENOBUFS : err;
2833 }
2834 
2835 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
2836                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
2837                                 const struct nlattr * const cda[])
2838 {
2839         struct nf_conntrack_expect *exp;
2840         struct nf_conntrack_tuple tuple;
2841         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2842         struct hlist_node *next;
2843         u_int8_t u3 = nfmsg->nfgen_family;
2844         struct nf_conntrack_zone zone;
2845         unsigned int i;
2846         int err;
2847 
2848         if (cda[CTA_EXPECT_TUPLE]) {
2849                 /* delete a single expect by tuple */
2850                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2851                 if (err < 0)
2852                         return err;
2853 
2854                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2855                                             u3, NULL);
2856                 if (err < 0)
2857                         return err;
2858 
2859                 /* bump usage count to 2 */
2860                 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2861                 if (!exp)
2862                         return -ENOENT;
2863 
2864                 if (cda[CTA_EXPECT_ID]) {
2865                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2866                         if (ntohl(id) != (u32)(unsigned long)exp) {
2867                                 nf_ct_expect_put(exp);
2868                                 return -ENOENT;
2869                         }
2870                 }
2871 
2872                 /* after list removal, usage count == 1 */
2873                 spin_lock_bh(&nf_conntrack_expect_lock);
2874                 if (del_timer(&exp->timeout)) {
2875                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2876                                                    nlmsg_report(nlh));
2877                         nf_ct_expect_put(exp);
2878                 }
2879                 spin_unlock_bh(&nf_conntrack_expect_lock);
2880                 /* have to put what we 'get' above.
2881                  * after this line usage count == 0 */
2882                 nf_ct_expect_put(exp);
2883         } else if (cda[CTA_EXPECT_HELP_NAME]) {
2884                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2885                 struct nf_conn_help *m_help;
2886 
2887                 /* delete all expectations for this helper */
2888                 spin_lock_bh(&nf_conntrack_expect_lock);
2889                 for (i = 0; i < nf_ct_expect_hsize; i++) {
2890                         hlist_for_each_entry_safe(exp, next,
2891                                                   &nf_ct_expect_hash[i],
2892                                                   hnode) {
2893 
2894                                 if (!net_eq(nf_ct_exp_net(exp), net))
2895                                         continue;
2896 
2897                                 m_help = nfct_help(exp->master);
2898                                 if (!strcmp(m_help->helper->name, name) &&
2899                                     del_timer(&exp->timeout)) {
2900                                         nf_ct_unlink_expect_report(exp,
2901                                                         NETLINK_CB(skb).portid,
2902                                                         nlmsg_report(nlh));
2903                                         nf_ct_expect_put(exp);
2904                                 }
2905                         }
2906                 }
2907                 spin_unlock_bh(&nf_conntrack_expect_lock);
2908         } else {
2909                 /* This basically means we have to flush everything*/
2910                 spin_lock_bh(&nf_conntrack_expect_lock);
2911                 for (i = 0; i < nf_ct_expect_hsize; i++) {
2912                         hlist_for_each_entry_safe(exp, next,
2913                                                   &nf_ct_expect_hash[i],
2914                                                   hnode) {
2915 
2916                                 if (!net_eq(nf_ct_exp_net(exp), net))
2917                                         continue;
2918 
2919                                 if (del_timer(&exp->timeout)) {
2920                                         nf_ct_unlink_expect_report(exp,
2921                                                         NETLINK_CB(skb).portid,
2922                                                         nlmsg_report(nlh));
2923                                         nf_ct_expect_put(exp);
2924                                 }
2925                         }
2926                 }
2927                 spin_unlock_bh(&nf_conntrack_expect_lock);
2928         }
2929 
2930         return 0;
2931 }
2932 static int
2933 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2934                         const struct nlattr * const cda[])
2935 {
2936         if (cda[CTA_EXPECT_TIMEOUT]) {
2937                 if (!del_timer(&x->timeout))
2938                         return -ETIME;
2939 
2940                 x->timeout.expires = jiffies +
2941                         ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2942                 add_timer(&x->timeout);
2943         }
2944         return 0;
2945 }
2946 
2947 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2948         [CTA_EXPECT_NAT_DIR]    = { .type = NLA_U32 },
2949         [CTA_EXPECT_NAT_TUPLE]  = { .type = NLA_NESTED },
2950 };
2951 
2952 static int
2953 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2954                            struct nf_conntrack_expect *exp,
2955                            u_int8_t u3)
2956 {
2957 #ifdef CONFIG_NF_NAT_NEEDED
2958         struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2959         struct nf_conntrack_tuple nat_tuple = {};
2960         int err;
2961 
2962         err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2963         if (err < 0)
2964                 return err;
2965 
2966         if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2967                 return -EINVAL;
2968 
2969         err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2970                                     &nat_tuple, CTA_EXPECT_NAT_TUPLE,
2971                                     u3, NULL);
2972         if (err < 0)
2973                 return err;
2974 
2975         exp->saved_addr = nat_tuple.src.u3;
2976         exp->saved_proto = nat_tuple.src.u;
2977         exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2978 
2979         return 0;
2980 #else
2981         return -EOPNOTSUPP;
2982 #endif
2983 }
2984 
2985 static struct nf_conntrack_expect *
2986 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2987                        struct nf_conntrack_helper *helper,
2988                        struct nf_conntrack_tuple *tuple,
2989                        struct nf_conntrack_tuple *mask)
2990 {
2991         u_int32_t class = 0;
2992         struct nf_conntrack_expect *exp;
2993         struct nf_conn_help *help;
2994         int err;
2995 
2996         if (cda[CTA_EXPECT_CLASS] && helper) {
2997                 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2998                 if (class > helper->expect_class_max)
2999                         return ERR_PTR(-EINVAL);
3000         }
3001         exp = nf_ct_expect_alloc(ct);
3002         if (!exp)
3003                 return ERR_PTR(-ENOMEM);
3004 
3005         help = nfct_help(ct);
3006         if (!help) {
3007                 if (!cda[CTA_EXPECT_TIMEOUT]) {
3008                         err = -EINVAL;
3009                         goto err_out;
3010                 }
3011                 exp->timeout.expires =
3012                   jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3013 
3014                 exp->flags = NF_CT_EXPECT_USERSPACE;
3015                 if (cda[CTA_EXPECT_FLAGS]) {
3016                         exp->flags |=
3017                                 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3018                 }
3019         } else {
3020                 if (cda[CTA_EXPECT_FLAGS]) {
3021                         exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3022                         exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3023                 } else
3024                         exp->flags = 0;
3025         }
3026         if (cda[CTA_EXPECT_FN]) {
3027                 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3028                 struct nf_ct_helper_expectfn *expfn;
3029 
3030                 expfn = nf_ct_helper_expectfn_find_by_name(name);
3031                 if (expfn == NULL) {
3032                         err = -EINVAL;
3033                         goto err_out;
3034                 }
3035                 exp->expectfn = expfn->expectfn;
3036         } else
3037                 exp->expectfn = NULL;
3038 
3039         exp->class = class;
3040         exp->master = ct;
3041         exp->helper = helper;
3042         exp->tuple = *tuple;
3043         exp->mask.src.u3 = mask->src.u3;
3044         exp->mask.src.u.all = mask->src.u.all;
3045 
3046         if (cda[CTA_EXPECT_NAT]) {
3047                 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3048                                                  exp, nf_ct_l3num(ct));
3049                 if (err < 0)
3050                         goto err_out;
3051         }
3052         return exp;
3053 err_out:
3054         nf_ct_expect_put(exp);
3055         return ERR_PTR(err);
3056 }
3057 
3058 static int
3059 ctnetlink_create_expect(struct net *net,
3060                         const struct nf_conntrack_zone *zone,
3061                         const struct nlattr * const cda[],
3062                         u_int8_t u3, u32 portid, int report)
3063 {
3064         struct nf_conntrack_tuple tuple, mask, master_tuple;
3065         struct nf_conntrack_tuple_hash *h = NULL;
3066         struct nf_conntrack_helper *helper = NULL;
3067         struct nf_conntrack_expect *exp;
3068         struct nf_conn *ct;
3069         int err;
3070 
3071         /* caller guarantees that those three CTA_EXPECT_* exist */
3072         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3073                                     u3, NULL);
3074         if (err < 0)
3075                 return err;
3076         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3077                                     u3, NULL);
3078         if (err < 0)
3079                 return err;
3080         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3081                                     u3, NULL);
3082         if (err < 0)
3083                 return err;
3084 
3085         /* Look for master conntrack of this expectation */
3086         h = nf_conntrack_find_get(net, zone, &master_tuple);
3087         if (!h)
3088                 return -ENOENT;
3089         ct = nf_ct_tuplehash_to_ctrack(h);
3090 
3091         if (cda[CTA_EXPECT_HELP_NAME]) {
3092                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3093 
3094                 helper = __nf_conntrack_helper_find(helpname, u3,
3095                                                     nf_ct_protonum(ct));
3096                 if (helper == NULL) {
3097 #ifdef CONFIG_MODULES
3098                         if (request_module("nfct-helper-%s", helpname) < 0) {
3099                                 err = -EOPNOTSUPP;
3100                                 goto err_ct;
3101                         }
3102                         helper = __nf_conntrack_helper_find(helpname, u3,
3103                                                             nf_ct_protonum(ct));
3104                         if (helper) {
3105                                 err = -EAGAIN;
3106                                 goto err_ct;
3107                         }
3108 #endif
3109                         err = -EOPNOTSUPP;
3110                         goto err_ct;
3111                 }
3112         }
3113 
3114         exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3115         if (IS_ERR(exp)) {
3116                 err = PTR_ERR(exp);
3117                 goto err_ct;
3118         }
3119 
3120         err = nf_ct_expect_related_report(exp, portid, report);
3121         nf_ct_expect_put(exp);
3122 err_ct:
3123         nf_ct_put(ct);
3124         return err;
3125 }
3126 
3127 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3128                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3129                                 const struct nlattr * const cda[])
3130 {
3131         struct nf_conntrack_tuple tuple;
3132         struct nf_conntrack_expect *exp;
3133         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3134         u_int8_t u3 = nfmsg->nfgen_family;
3135         struct nf_conntrack_zone zone;
3136         int err;
3137 
3138         if (!cda[CTA_EXPECT_TUPLE]
3139             || !cda[CTA_EXPECT_MASK]
3140             || !cda[CTA_EXPECT_MASTER])
3141                 return -EINVAL;
3142 
3143         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3144         if (err < 0)
3145                 return err;
3146 
3147         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3148                                     u3, NULL);
3149         if (err < 0)
3150                 return err;
3151 
3152         spin_lock_bh(&nf_conntrack_expect_lock);
3153         exp = __nf_ct_expect_find(net, &zone, &tuple);
3154         if (!exp) {
3155                 spin_unlock_bh(&nf_conntrack_expect_lock);
3156                 err = -ENOENT;
3157                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3158                         err = ctnetlink_create_expect(net, &zone, cda, u3,
3159                                                       NETLINK_CB(skb).portid,
3160                                                       nlmsg_report(nlh));
3161                 }
3162                 return err;
3163         }
3164 
3165         err = -EEXIST;
3166         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3167                 err = ctnetlink_change_expect(exp, cda);
3168         spin_unlock_bh(&nf_conntrack_expect_lock);
3169 
3170         return err;
3171 }
3172 
3173 static int
3174 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3175                              const struct ip_conntrack_stat *st)
3176 {
3177         struct nlmsghdr *nlh;
3178         struct nfgenmsg *nfmsg;
3179         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3180 
3181         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3182         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3183         if (nlh == NULL)
3184                 goto nlmsg_failure;
3185 
3186         nfmsg = nlmsg_data(nlh);
3187         nfmsg->nfgen_family = AF_UNSPEC;
3188         nfmsg->version      = NFNETLINK_V0;
3189         nfmsg->res_id       = htons(cpu);
3190 
3191         if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3192             nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3193             nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3194                 goto nla_put_failure;
3195 
3196         nlmsg_end(skb, nlh);
3197         return skb->len;
3198 
3199 nla_put_failure:
3200 nlmsg_failure:
3201         nlmsg_cancel(skb, nlh);
3202         return -1;
3203 }
3204 
3205 static int
3206 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3207 {
3208         int cpu;
3209         struct net *net = sock_net(skb->sk);
3210 
3211         if (cb->args[0] == nr_cpu_ids)
3212                 return 0;
3213 
3214         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3215                 const struct ip_conntrack_stat *st;
3216 
3217                 if (!cpu_possible(cpu))
3218                         continue;
3219 
3220                 st = per_cpu_ptr(net->ct.stat, cpu);
3221                 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3222                                                  cb->nlh->nlmsg_seq,
3223                                                  cpu, st) < 0)
3224                         break;
3225         }
3226         cb->args[0] = cpu;
3227 
3228         return skb->len;
3229 }
3230 
3231 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3232                                   struct sk_buff *skb,
3233                                   const struct nlmsghdr *nlh,
3234                                   const struct nlattr * const cda[])
3235 {
3236         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3237                 struct netlink_dump_control c = {
3238                         .dump = ctnetlink_exp_stat_cpu_dump,
3239                 };
3240                 return netlink_dump_start(ctnl, skb, nlh, &c);
3241         }
3242 
3243         return 0;
3244 }
3245 
3246 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3247 static struct nf_ct_event_notifier ctnl_notifier = {
3248         .fcn = ctnetlink_conntrack_event,
3249 };
3250 
3251 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3252         .fcn = ctnetlink_expect_event,
3253 };
3254 #endif
3255 
3256 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3257         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
3258                                             .attr_count = CTA_MAX,
3259                                             .policy = ct_nla_policy },
3260         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
3261                                             .attr_count = CTA_MAX,
3262                                             .policy = ct_nla_policy },
3263         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
3264                                             .attr_count = CTA_MAX,
3265                                             .policy = ct_nla_policy },
3266         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
3267                                             .attr_count = CTA_MAX,
3268                                             .policy = ct_nla_policy },
3269         [IPCTNL_MSG_CT_GET_STATS_CPU]   = { .call = ctnetlink_stat_ct_cpu },
3270         [IPCTNL_MSG_CT_GET_STATS]       = { .call = ctnetlink_stat_ct },
3271         [IPCTNL_MSG_CT_GET_DYING]       = { .call = ctnetlink_get_ct_dying },
3272         [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3273 };
3274 
3275 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3276         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
3277                                             .attr_count = CTA_EXPECT_MAX,
3278                                             .policy = exp_nla_policy },
3279         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
3280                                             .attr_count = CTA_EXPECT_MAX,
3281                                             .policy = exp_nla_policy },
3282         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
3283                                             .attr_count = CTA_EXPECT_MAX,
3284                                             .policy = exp_nla_policy },
3285         [IPCTNL_MSG_EXP_GET_STATS_CPU]  = { .call = ctnetlink_stat_exp_cpu },
3286 };
3287 
3288 static const struct nfnetlink_subsystem ctnl_subsys = {
3289         .name                           = "conntrack",
3290         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
3291         .cb_count                       = IPCTNL_MSG_MAX,
3292         .cb                             = ctnl_cb,
3293 };
3294 
3295 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3296         .name                           = "conntrack_expect",
3297         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
3298         .cb_count                       = IPCTNL_MSG_EXP_MAX,
3299         .cb                             = ctnl_exp_cb,
3300 };
3301 
3302 MODULE_ALIAS("ip_conntrack_netlink");
3303 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3304 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3305 
3306 static int __net_init ctnetlink_net_init(struct net *net)
3307 {
3308 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3309         int ret;
3310 
3311         ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3312         if (ret < 0) {
3313                 pr_err("ctnetlink_init: cannot register notifier.\n");
3314                 goto err_out;
3315         }
3316 
3317         ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3318         if (ret < 0) {
3319                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3320                 goto err_unreg_notifier;
3321         }
3322 #endif
3323         return 0;
3324 
3325 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3326 err_unreg_notifier:
3327         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3328 err_out:
3329         return ret;
3330 #endif
3331 }
3332 
3333 static void ctnetlink_net_exit(struct net *net)
3334 {
3335 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3336         nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3337         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3338 #endif
3339 }
3340 
3341 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3342 {
3343         struct net *net;
3344 
3345         list_for_each_entry(net, net_exit_list, exit_list)
3346                 ctnetlink_net_exit(net);
3347 }
3348 
3349 static struct pernet_operations ctnetlink_net_ops = {
3350         .init           = ctnetlink_net_init,
3351         .exit_batch     = ctnetlink_net_exit_batch,
3352 };
3353 
3354 static int __init ctnetlink_init(void)
3355 {
3356         int ret;
3357 
3358         pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3359         ret = nfnetlink_subsys_register(&ctnl_subsys);
3360         if (ret < 0) {
3361                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3362                 goto err_out;
3363         }
3364 
3365         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3366         if (ret < 0) {
3367                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3368                 goto err_unreg_subsys;
3369         }
3370 
3371         ret = register_pernet_subsys(&ctnetlink_net_ops);
3372         if (ret < 0) {
3373                 pr_err("ctnetlink_init: cannot register pernet operations\n");
3374                 goto err_unreg_exp_subsys;
3375         }
3376 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3377         /* setup interaction between nf_queue and nf_conntrack_netlink. */
3378         RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3379 #endif
3380         return 0;
3381 
3382 err_unreg_exp_subsys:
3383         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3384 err_unreg_subsys:
3385         nfnetlink_subsys_unregister(&ctnl_subsys);
3386 err_out:
3387         return ret;
3388 }
3389 
3390 static void __exit ctnetlink_exit(void)
3391 {
3392         pr_info("ctnetlink: unregistering from nfnetlink.\n");
3393 
3394         unregister_pernet_subsys(&ctnetlink_net_ops);
3395         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3396         nfnetlink_subsys_unregister(&ctnl_subsys);
3397 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3398         RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3399 #endif
3400 }
3401 
3402 module_init(ctnetlink_init);
3403 module_exit(ctnetlink_exit);
3404 

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