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Linux/net/netfilter/nf_conntrack_netlink.c

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ 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 #include <linux/siphash.h>
 33 
 34 #include <linux/netfilter.h>
 35 #include <net/netlink.h>
 36 #include <net/sock.h>
 37 #include <net/netfilter/nf_conntrack.h>
 38 #include <net/netfilter/nf_conntrack_core.h>
 39 #include <net/netfilter/nf_conntrack_expect.h>
 40 #include <net/netfilter/nf_conntrack_helper.h>
 41 #include <net/netfilter/nf_conntrack_seqadj.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 #include <net/netfilter/nf_conntrack_synproxy.h>
 49 #if IS_ENABLED(CONFIG_NF_NAT)
 50 #include <net/netfilter/nf_nat.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 int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
 60                                 const struct nf_conntrack_tuple *tuple,
 61                                 const struct nf_conntrack_l4proto *l4proto)
 62 {
 63         int ret = 0;
 64         struct nlattr *nest_parms;
 65 
 66         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
 67         if (!nest_parms)
 68                 goto nla_put_failure;
 69         if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
 70                 goto nla_put_failure;
 71 
 72         if (likely(l4proto->tuple_to_nlattr))
 73                 ret = l4proto->tuple_to_nlattr(skb, tuple);
 74 
 75         nla_nest_end(skb, nest_parms);
 76 
 77         return ret;
 78 
 79 nla_put_failure:
 80         return -1;
 81 }
 82 
 83 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
 84                                 const struct nf_conntrack_tuple *tuple)
 85 {
 86         if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
 87             nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
 88                 return -EMSGSIZE;
 89         return 0;
 90 }
 91 
 92 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
 93                                 const struct nf_conntrack_tuple *tuple)
 94 {
 95         if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
 96             nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
 97                 return -EMSGSIZE;
 98         return 0;
 99 }
100 
101 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
102                                     const struct nf_conntrack_tuple *tuple)
103 {
104         int ret = 0;
105         struct nlattr *nest_parms;
106 
107         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
108         if (!nest_parms)
109                 goto nla_put_failure;
110 
111         switch (tuple->src.l3num) {
112         case NFPROTO_IPV4:
113                 ret = ipv4_tuple_to_nlattr(skb, tuple);
114                 break;
115         case NFPROTO_IPV6:
116                 ret = ipv6_tuple_to_nlattr(skb, tuple);
117                 break;
118         }
119 
120         nla_nest_end(skb, nest_parms);
121 
122         return ret;
123 
124 nla_put_failure:
125         return -1;
126 }
127 
128 static int ctnetlink_dump_tuples(struct sk_buff *skb,
129                                  const struct nf_conntrack_tuple *tuple)
130 {
131         const struct nf_conntrack_l4proto *l4proto;
132         int ret;
133 
134         rcu_read_lock();
135         ret = ctnetlink_dump_tuples_ip(skb, tuple);
136 
137         if (ret >= 0) {
138                 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
139                 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
140         }
141         rcu_read_unlock();
142         return ret;
143 }
144 
145 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
146                                   const struct nf_conntrack_zone *zone, int dir)
147 {
148         if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
149                 return 0;
150         if (nla_put_be16(skb, attrtype, htons(zone->id)))
151                 goto nla_put_failure;
152         return 0;
153 
154 nla_put_failure:
155         return -1;
156 }
157 
158 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
159 {
160         if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
161                 goto nla_put_failure;
162         return 0;
163 
164 nla_put_failure:
165         return -1;
166 }
167 
168 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
169 {
170         long timeout = nf_ct_expires(ct) / HZ;
171 
172         if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
173                 goto nla_put_failure;
174         return 0;
175 
176 nla_put_failure:
177         return -1;
178 }
179 
180 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
181 {
182         const struct nf_conntrack_l4proto *l4proto;
183         struct nlattr *nest_proto;
184         int ret;
185 
186         l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
187         if (!l4proto->to_nlattr)
188                 return 0;
189 
190         nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
191         if (!nest_proto)
192                 goto nla_put_failure;
193 
194         ret = l4proto->to_nlattr(skb, nest_proto, ct);
195 
196         nla_nest_end(skb, nest_proto);
197 
198         return ret;
199 
200 nla_put_failure:
201         return -1;
202 }
203 
204 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
205                                    const struct nf_conn *ct)
206 {
207         struct nlattr *nest_helper;
208         const struct nf_conn_help *help = nfct_help(ct);
209         struct nf_conntrack_helper *helper;
210 
211         if (!help)
212                 return 0;
213 
214         helper = rcu_dereference(help->helper);
215         if (!helper)
216                 goto out;
217 
218         nest_helper = nla_nest_start(skb, CTA_HELP);
219         if (!nest_helper)
220                 goto nla_put_failure;
221         if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
222                 goto nla_put_failure;
223 
224         if (helper->to_nlattr)
225                 helper->to_nlattr(skb, ct);
226 
227         nla_nest_end(skb, nest_helper);
228 out:
229         return 0;
230 
231 nla_put_failure:
232         return -1;
233 }
234 
235 static int
236 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
237               enum ip_conntrack_dir dir, int type)
238 {
239         enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
240         struct nf_conn_counter *counter = acct->counter;
241         struct nlattr *nest_count;
242         u64 pkts, bytes;
243 
244         if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
245                 pkts = atomic64_xchg(&counter[dir].packets, 0);
246                 bytes = atomic64_xchg(&counter[dir].bytes, 0);
247         } else {
248                 pkts = atomic64_read(&counter[dir].packets);
249                 bytes = atomic64_read(&counter[dir].bytes);
250         }
251 
252         nest_count = nla_nest_start(skb, attr);
253         if (!nest_count)
254                 goto nla_put_failure;
255 
256         if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
257                          CTA_COUNTERS_PAD) ||
258             nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
259                          CTA_COUNTERS_PAD))
260                 goto nla_put_failure;
261 
262         nla_nest_end(skb, nest_count);
263 
264         return 0;
265 
266 nla_put_failure:
267         return -1;
268 }
269 
270 static int
271 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
272 {
273         struct nf_conn_acct *acct = nf_conn_acct_find(ct);
274 
275         if (!acct)
276                 return 0;
277 
278         if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
279                 return -1;
280         if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
281                 return -1;
282 
283         return 0;
284 }
285 
286 static int
287 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
288 {
289         struct nlattr *nest_count;
290         const struct nf_conn_tstamp *tstamp;
291 
292         tstamp = nf_conn_tstamp_find(ct);
293         if (!tstamp)
294                 return 0;
295 
296         nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
297         if (!nest_count)
298                 goto nla_put_failure;
299 
300         if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
301                          CTA_TIMESTAMP_PAD) ||
302             (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
303                                                cpu_to_be64(tstamp->stop),
304                                                CTA_TIMESTAMP_PAD)))
305                 goto nla_put_failure;
306         nla_nest_end(skb, nest_count);
307 
308         return 0;
309 
310 nla_put_failure:
311         return -1;
312 }
313 
314 #ifdef CONFIG_NF_CONNTRACK_MARK
315 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
316 {
317         if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
318                 goto nla_put_failure;
319         return 0;
320 
321 nla_put_failure:
322         return -1;
323 }
324 #else
325 #define ctnetlink_dump_mark(a, b) (0)
326 #endif
327 
328 #ifdef CONFIG_NF_CONNTRACK_SECMARK
329 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
330 {
331         struct nlattr *nest_secctx;
332         int len, ret;
333         char *secctx;
334 
335         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
336         if (ret)
337                 return 0;
338 
339         ret = -1;
340         nest_secctx = nla_nest_start(skb, CTA_SECCTX);
341         if (!nest_secctx)
342                 goto nla_put_failure;
343 
344         if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
345                 goto nla_put_failure;
346         nla_nest_end(skb, nest_secctx);
347 
348         ret = 0;
349 nla_put_failure:
350         security_release_secctx(secctx, len);
351         return ret;
352 }
353 #else
354 #define ctnetlink_dump_secctx(a, b) (0)
355 #endif
356 
357 #ifdef CONFIG_NF_CONNTRACK_LABELS
358 static inline int ctnetlink_label_size(const struct nf_conn *ct)
359 {
360         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
361 
362         if (!labels)
363                 return 0;
364         return nla_total_size(sizeof(labels->bits));
365 }
366 
367 static int
368 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
369 {
370         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
371         unsigned int i;
372 
373         if (!labels)
374                 return 0;
375 
376         i = 0;
377         do {
378                 if (labels->bits[i] != 0)
379                         return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
380                                        labels->bits);
381                 i++;
382         } while (i < ARRAY_SIZE(labels->bits));
383 
384         return 0;
385 }
386 #else
387 #define ctnetlink_dump_labels(a, b) (0)
388 #define ctnetlink_label_size(a) (0)
389 #endif
390 
391 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
392 
393 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
394 {
395         struct nlattr *nest_parms;
396 
397         if (!(ct->status & IPS_EXPECTED))
398                 return 0;
399 
400         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
401         if (!nest_parms)
402                 goto nla_put_failure;
403         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
404                 goto nla_put_failure;
405         nla_nest_end(skb, nest_parms);
406 
407         return 0;
408 
409 nla_put_failure:
410         return -1;
411 }
412 
413 static int
414 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
415 {
416         struct nlattr *nest_parms;
417 
418         nest_parms = nla_nest_start(skb, type);
419         if (!nest_parms)
420                 goto nla_put_failure;
421 
422         if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
423                          htonl(seq->correction_pos)) ||
424             nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
425                          htonl(seq->offset_before)) ||
426             nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
427                          htonl(seq->offset_after)))
428                 goto nla_put_failure;
429 
430         nla_nest_end(skb, nest_parms);
431 
432         return 0;
433 
434 nla_put_failure:
435         return -1;
436 }
437 
438 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
439 {
440         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
441         struct nf_ct_seqadj *seq;
442 
443         if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
444                 return 0;
445 
446         spin_lock_bh(&ct->lock);
447         seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
448         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
449                 goto err;
450 
451         seq = &seqadj->seq[IP_CT_DIR_REPLY];
452         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
453                 goto err;
454 
455         spin_unlock_bh(&ct->lock);
456         return 0;
457 err:
458         spin_unlock_bh(&ct->lock);
459         return -1;
460 }
461 
462 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
463 {
464         struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
465         struct nlattr *nest_parms;
466 
467         if (!synproxy)
468                 return 0;
469 
470         nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
471         if (!nest_parms)
472                 goto nla_put_failure;
473 
474         if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
475             nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
476             nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
477                 goto nla_put_failure;
478 
479         nla_nest_end(skb, nest_parms);
480 
481         return 0;
482 
483 nla_put_failure:
484         return -1;
485 }
486 
487 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
488 {
489         __be32 id = (__force __be32)nf_ct_get_id(ct);
490 
491         if (nla_put_be32(skb, CTA_ID, id))
492                 goto nla_put_failure;
493         return 0;
494 
495 nla_put_failure:
496         return -1;
497 }
498 
499 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
500 {
501         if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
502                 goto nla_put_failure;
503         return 0;
504 
505 nla_put_failure:
506         return -1;
507 }
508 
509 static int
510 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
511                     struct nf_conn *ct)
512 {
513         const struct nf_conntrack_zone *zone;
514         struct nlmsghdr *nlh;
515         struct nfgenmsg *nfmsg;
516         struct nlattr *nest_parms;
517         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
518 
519         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
520         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
521         if (nlh == NULL)
522                 goto nlmsg_failure;
523 
524         nfmsg = nlmsg_data(nlh);
525         nfmsg->nfgen_family = nf_ct_l3num(ct);
526         nfmsg->version      = NFNETLINK_V0;
527         nfmsg->res_id       = 0;
528 
529         zone = nf_ct_zone(ct);
530 
531         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
532         if (!nest_parms)
533                 goto nla_put_failure;
534         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
535                 goto nla_put_failure;
536         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
537                                    NF_CT_ZONE_DIR_ORIG) < 0)
538                 goto nla_put_failure;
539         nla_nest_end(skb, nest_parms);
540 
541         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
542         if (!nest_parms)
543                 goto nla_put_failure;
544         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
545                 goto nla_put_failure;
546         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
547                                    NF_CT_ZONE_DIR_REPL) < 0)
548                 goto nla_put_failure;
549         nla_nest_end(skb, nest_parms);
550 
551         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
552                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
553                 goto nla_put_failure;
554 
555         if (ctnetlink_dump_status(skb, ct) < 0 ||
556             ctnetlink_dump_acct(skb, ct, type) < 0 ||
557             ctnetlink_dump_timestamp(skb, ct) < 0 ||
558             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
559             ctnetlink_dump_mark(skb, ct) < 0 ||
560             ctnetlink_dump_secctx(skb, ct) < 0 ||
561             ctnetlink_dump_labels(skb, ct) < 0 ||
562             ctnetlink_dump_id(skb, ct) < 0 ||
563             ctnetlink_dump_use(skb, ct) < 0 ||
564             ctnetlink_dump_master(skb, ct) < 0 ||
565             ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
566             ctnetlink_dump_ct_synproxy(skb, ct) < 0)
567                 goto nla_put_failure;
568 
569         if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
570             (ctnetlink_dump_timeout(skb, ct) < 0 ||
571              ctnetlink_dump_protoinfo(skb, ct) < 0))
572                 goto nla_put_failure;
573 
574         nlmsg_end(skb, nlh);
575         return skb->len;
576 
577 nlmsg_failure:
578 nla_put_failure:
579         nlmsg_cancel(skb, nlh);
580         return -1;
581 }
582 
583 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
584         [CTA_IP_V4_SRC] = { .type = NLA_U32 },
585         [CTA_IP_V4_DST] = { .type = NLA_U32 },
586         [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
587         [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
588 };
589 
590 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
591 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
592 {
593         const struct nf_conntrack_l4proto *l4proto;
594         size_t len, len4 = 0;
595 
596         len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
597         len *= 3u; /* ORIG, REPLY, MASTER */
598 
599         l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
600         len += l4proto->nlattr_size;
601         if (l4proto->nlattr_tuple_size) {
602                 len4 = l4proto->nlattr_tuple_size();
603                 len4 *= 3u; /* ORIG, REPLY, MASTER */
604         }
605 
606         return len + len4;
607 }
608 #endif
609 
610 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
611 {
612         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
613                 return 0;
614         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
615                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
616                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
617                ;
618 }
619 
620 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
621 {
622 #ifdef CONFIG_NF_CONNTRACK_SECMARK
623         int len, ret;
624 
625         ret = security_secid_to_secctx(ct->secmark, NULL, &len);
626         if (ret)
627                 return 0;
628 
629         return nla_total_size(0) /* CTA_SECCTX */
630                + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
631 #else
632         return 0;
633 #endif
634 }
635 
636 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
637 {
638 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
639         if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
640                 return 0;
641         return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
642 #else
643         return 0;
644 #endif
645 }
646 
647 #ifdef CONFIG_NF_CONNTRACK_EVENTS
648 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
649 {
650         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
651                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
652                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
653                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
654                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
655                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
656                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
657                + ctnetlink_acct_size(ct)
658                + ctnetlink_timestamp_size(ct)
659                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
660                + nla_total_size(0) /* CTA_PROTOINFO */
661                + nla_total_size(0) /* CTA_HELP */
662                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
663                + ctnetlink_secctx_size(ct)
664 #if IS_ENABLED(CONFIG_NF_NAT)
665                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
666                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
667 #endif
668 #ifdef CONFIG_NF_CONNTRACK_MARK
669                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
670 #endif
671 #ifdef CONFIG_NF_CONNTRACK_ZONES
672                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
673 #endif
674                + ctnetlink_proto_size(ct)
675                + ctnetlink_label_size(ct)
676                ;
677 }
678 
679 static int
680 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
681 {
682         const struct nf_conntrack_zone *zone;
683         struct net *net;
684         struct nlmsghdr *nlh;
685         struct nfgenmsg *nfmsg;
686         struct nlattr *nest_parms;
687         struct nf_conn *ct = item->ct;
688         struct sk_buff *skb;
689         unsigned int type;
690         unsigned int flags = 0, group;
691         int err;
692 
693         if (events & (1 << IPCT_DESTROY)) {
694                 type = IPCTNL_MSG_CT_DELETE;
695                 group = NFNLGRP_CONNTRACK_DESTROY;
696         } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
697                 type = IPCTNL_MSG_CT_NEW;
698                 flags = NLM_F_CREATE|NLM_F_EXCL;
699                 group = NFNLGRP_CONNTRACK_NEW;
700         } else if (events) {
701                 type = IPCTNL_MSG_CT_NEW;
702                 group = NFNLGRP_CONNTRACK_UPDATE;
703         } else
704                 return 0;
705 
706         net = nf_ct_net(ct);
707         if (!item->report && !nfnetlink_has_listeners(net, group))
708                 return 0;
709 
710         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
711         if (skb == NULL)
712                 goto errout;
713 
714         type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
715         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
716         if (nlh == NULL)
717                 goto nlmsg_failure;
718 
719         nfmsg = nlmsg_data(nlh);
720         nfmsg->nfgen_family = nf_ct_l3num(ct);
721         nfmsg->version  = NFNETLINK_V0;
722         nfmsg->res_id   = 0;
723 
724         zone = nf_ct_zone(ct);
725 
726         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
727         if (!nest_parms)
728                 goto nla_put_failure;
729         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
730                 goto nla_put_failure;
731         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
732                                    NF_CT_ZONE_DIR_ORIG) < 0)
733                 goto nla_put_failure;
734         nla_nest_end(skb, nest_parms);
735 
736         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
737         if (!nest_parms)
738                 goto nla_put_failure;
739         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
740                 goto nla_put_failure;
741         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
742                                    NF_CT_ZONE_DIR_REPL) < 0)
743                 goto nla_put_failure;
744         nla_nest_end(skb, nest_parms);
745 
746         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
747                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
748                 goto nla_put_failure;
749 
750         if (ctnetlink_dump_id(skb, ct) < 0)
751                 goto nla_put_failure;
752 
753         if (ctnetlink_dump_status(skb, ct) < 0)
754                 goto nla_put_failure;
755 
756         if (events & (1 << IPCT_DESTROY)) {
757                 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
758                     ctnetlink_dump_timestamp(skb, ct) < 0)
759                         goto nla_put_failure;
760         } else {
761                 if (ctnetlink_dump_timeout(skb, ct) < 0)
762                         goto nla_put_failure;
763 
764                 if (events & (1 << IPCT_PROTOINFO)
765                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
766                         goto nla_put_failure;
767 
768                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
769                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
770                         goto nla_put_failure;
771 
772 #ifdef CONFIG_NF_CONNTRACK_SECMARK
773                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
774                     && ctnetlink_dump_secctx(skb, ct) < 0)
775                         goto nla_put_failure;
776 #endif
777                 if (events & (1 << IPCT_LABEL) &&
778                      ctnetlink_dump_labels(skb, ct) < 0)
779                         goto nla_put_failure;
780 
781                 if (events & (1 << IPCT_RELATED) &&
782                     ctnetlink_dump_master(skb, ct) < 0)
783                         goto nla_put_failure;
784 
785                 if (events & (1 << IPCT_SEQADJ) &&
786                     ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
787                         goto nla_put_failure;
788 
789                 if (events & (1 << IPCT_SYNPROXY) &&
790                     ctnetlink_dump_ct_synproxy(skb, ct) < 0)
791                         goto nla_put_failure;
792         }
793 
794 #ifdef CONFIG_NF_CONNTRACK_MARK
795         if ((events & (1 << IPCT_MARK) || ct->mark)
796             && ctnetlink_dump_mark(skb, ct) < 0)
797                 goto nla_put_failure;
798 #endif
799         nlmsg_end(skb, nlh);
800         err = nfnetlink_send(skb, net, item->portid, group, item->report,
801                              GFP_ATOMIC);
802         if (err == -ENOBUFS || err == -EAGAIN)
803                 return -ENOBUFS;
804 
805         return 0;
806 
807 nla_put_failure:
808         nlmsg_cancel(skb, nlh);
809 nlmsg_failure:
810         kfree_skb(skb);
811 errout:
812         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
813                 return -ENOBUFS;
814 
815         return 0;
816 }
817 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
818 
819 static int ctnetlink_done(struct netlink_callback *cb)
820 {
821         if (cb->args[1])
822                 nf_ct_put((struct nf_conn *)cb->args[1]);
823         kfree(cb->data);
824         return 0;
825 }
826 
827 struct ctnetlink_filter {
828         u8 family;
829         struct {
830                 u_int32_t val;
831                 u_int32_t mask;
832         } mark;
833 };
834 
835 static struct ctnetlink_filter *
836 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
837 {
838         struct ctnetlink_filter *filter;
839 
840 #ifndef CONFIG_NF_CONNTRACK_MARK
841         if (cda[CTA_MARK] && cda[CTA_MARK_MASK])
842                 return ERR_PTR(-EOPNOTSUPP);
843 #endif
844 
845         filter = kzalloc(sizeof(*filter), GFP_KERNEL);
846         if (filter == NULL)
847                 return ERR_PTR(-ENOMEM);
848 
849         filter->family = family;
850 
851 #ifdef CONFIG_NF_CONNTRACK_MARK
852         if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
853                 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
854                 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
855         }
856 #endif
857         return filter;
858 }
859 
860 static int ctnetlink_start(struct netlink_callback *cb)
861 {
862         const struct nlattr * const *cda = cb->data;
863         struct ctnetlink_filter *filter = NULL;
864         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
865         u8 family = nfmsg->nfgen_family;
866 
867         if (family || (cda[CTA_MARK] && cda[CTA_MARK_MASK])) {
868                 filter = ctnetlink_alloc_filter(cda, family);
869                 if (IS_ERR(filter))
870                         return PTR_ERR(filter);
871         }
872 
873         cb->data = filter;
874         return 0;
875 }
876 
877 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
878 {
879         struct ctnetlink_filter *filter = data;
880 
881         if (filter == NULL)
882                 goto out;
883 
884         /* Match entries of a given L3 protocol number.
885          * If it is not specified, ie. l3proto == 0,
886          * then match everything.
887          */
888         if (filter->family && nf_ct_l3num(ct) != filter->family)
889                 goto ignore_entry;
890 
891 #ifdef CONFIG_NF_CONNTRACK_MARK
892         if ((ct->mark & filter->mark.mask) != filter->mark.val)
893                 goto ignore_entry;
894 #endif
895 
896 out:
897         return 1;
898 
899 ignore_entry:
900         return 0;
901 }
902 
903 static int
904 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
905 {
906         struct net *net = sock_net(skb->sk);
907         struct nf_conn *ct, *last;
908         struct nf_conntrack_tuple_hash *h;
909         struct hlist_nulls_node *n;
910         struct nf_conn *nf_ct_evict[8];
911         int res, i;
912         spinlock_t *lockp;
913 
914         last = (struct nf_conn *)cb->args[1];
915         i = 0;
916 
917         local_bh_disable();
918         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
919 restart:
920                 while (i) {
921                         i--;
922                         if (nf_ct_should_gc(nf_ct_evict[i]))
923                                 nf_ct_kill(nf_ct_evict[i]);
924                         nf_ct_put(nf_ct_evict[i]);
925                 }
926 
927                 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
928                 nf_conntrack_lock(lockp);
929                 if (cb->args[0] >= nf_conntrack_htable_size) {
930                         spin_unlock(lockp);
931                         goto out;
932                 }
933                 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
934                                            hnnode) {
935                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
936                                 continue;
937                         ct = nf_ct_tuplehash_to_ctrack(h);
938                         if (nf_ct_is_expired(ct)) {
939                                 if (i < ARRAY_SIZE(nf_ct_evict) &&
940                                     atomic_inc_not_zero(&ct->ct_general.use))
941                                         nf_ct_evict[i++] = ct;
942                                 continue;
943                         }
944 
945                         if (!net_eq(net, nf_ct_net(ct)))
946                                 continue;
947 
948                         if (cb->args[1]) {
949                                 if (ct != last)
950                                         continue;
951                                 cb->args[1] = 0;
952                         }
953                         if (!ctnetlink_filter_match(ct, cb->data))
954                                 continue;
955 
956                         rcu_read_lock();
957                         res =
958                         ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
959                                             cb->nlh->nlmsg_seq,
960                                             NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
961                                             ct);
962                         rcu_read_unlock();
963                         if (res < 0) {
964                                 nf_conntrack_get(&ct->ct_general);
965                                 cb->args[1] = (unsigned long)ct;
966                                 spin_unlock(lockp);
967                                 goto out;
968                         }
969                 }
970                 spin_unlock(lockp);
971                 if (cb->args[1]) {
972                         cb->args[1] = 0;
973                         goto restart;
974                 }
975         }
976 out:
977         local_bh_enable();
978         if (last) {
979                 /* nf ct hash resize happened, now clear the leftover. */
980                 if ((struct nf_conn *)cb->args[1] == last)
981                         cb->args[1] = 0;
982 
983                 nf_ct_put(last);
984         }
985 
986         while (i) {
987                 i--;
988                 if (nf_ct_should_gc(nf_ct_evict[i]))
989                         nf_ct_kill(nf_ct_evict[i]);
990                 nf_ct_put(nf_ct_evict[i]);
991         }
992 
993         return skb->len;
994 }
995 
996 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
997                                 struct nf_conntrack_tuple *t)
998 {
999         if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST])
1000                 return -EINVAL;
1001 
1002         t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1003         t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1004 
1005         return 0;
1006 }
1007 
1008 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1009                                 struct nf_conntrack_tuple *t)
1010 {
1011         if (!tb[CTA_IP_V6_SRC] || !tb[CTA_IP_V6_DST])
1012                 return -EINVAL;
1013 
1014         t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1015         t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1016 
1017         return 0;
1018 }
1019 
1020 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1021                                     struct nf_conntrack_tuple *tuple)
1022 {
1023         struct nlattr *tb[CTA_IP_MAX+1];
1024         int ret = 0;
1025 
1026         ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1027         if (ret < 0)
1028                 return ret;
1029 
1030         ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1031                                              cta_ip_nla_policy, NULL);
1032         if (ret)
1033                 return ret;
1034 
1035         switch (tuple->src.l3num) {
1036         case NFPROTO_IPV4:
1037                 ret = ipv4_nlattr_to_tuple(tb, tuple);
1038                 break;
1039         case NFPROTO_IPV6:
1040                 ret = ipv6_nlattr_to_tuple(tb, tuple);
1041                 break;
1042         }
1043 
1044         return ret;
1045 }
1046 
1047 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1048         [CTA_PROTO_NUM] = { .type = NLA_U8 },
1049 };
1050 
1051 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1052                                        struct nf_conntrack_tuple *tuple)
1053 {
1054         const struct nf_conntrack_l4proto *l4proto;
1055         struct nlattr *tb[CTA_PROTO_MAX+1];
1056         int ret = 0;
1057 
1058         ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1059                                           proto_nla_policy, NULL);
1060         if (ret < 0)
1061                 return ret;
1062 
1063         if (!tb[CTA_PROTO_NUM])
1064                 return -EINVAL;
1065         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1066 
1067         rcu_read_lock();
1068         l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1069 
1070         if (likely(l4proto->nlattr_to_tuple)) {
1071                 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1072                                                      l4proto->nla_policy,
1073                                                      NULL);
1074                 if (ret == 0)
1075                         ret = l4proto->nlattr_to_tuple(tb, tuple);
1076         }
1077 
1078         rcu_read_unlock();
1079 
1080         return ret;
1081 }
1082 
1083 static int
1084 ctnetlink_parse_zone(const struct nlattr *attr,
1085                      struct nf_conntrack_zone *zone)
1086 {
1087         nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1088                         NF_CT_DEFAULT_ZONE_DIR, 0);
1089 #ifdef CONFIG_NF_CONNTRACK_ZONES
1090         if (attr)
1091                 zone->id = ntohs(nla_get_be16(attr));
1092 #else
1093         if (attr)
1094                 return -EOPNOTSUPP;
1095 #endif
1096         return 0;
1097 }
1098 
1099 static int
1100 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1101                            struct nf_conntrack_zone *zone)
1102 {
1103         int ret;
1104 
1105         if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1106                 return -EINVAL;
1107 
1108         ret = ctnetlink_parse_zone(attr, zone);
1109         if (ret < 0)
1110                 return ret;
1111 
1112         if (type == CTA_TUPLE_REPLY)
1113                 zone->dir = NF_CT_ZONE_DIR_REPL;
1114         else
1115                 zone->dir = NF_CT_ZONE_DIR_ORIG;
1116 
1117         return 0;
1118 }
1119 
1120 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1121         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
1122         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
1123         [CTA_TUPLE_ZONE]        = { .type = NLA_U16 },
1124 };
1125 
1126 static int
1127 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1128                       struct nf_conntrack_tuple *tuple, u32 type,
1129                       u_int8_t l3num, struct nf_conntrack_zone *zone)
1130 {
1131         struct nlattr *tb[CTA_TUPLE_MAX+1];
1132         int err;
1133 
1134         memset(tuple, 0, sizeof(*tuple));
1135 
1136         err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1137                                           tuple_nla_policy, NULL);
1138         if (err < 0)
1139                 return err;
1140 
1141         if (!tb[CTA_TUPLE_IP])
1142                 return -EINVAL;
1143 
1144         tuple->src.l3num = l3num;
1145 
1146         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1147         if (err < 0)
1148                 return err;
1149 
1150         if (!tb[CTA_TUPLE_PROTO])
1151                 return -EINVAL;
1152 
1153         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1154         if (err < 0)
1155                 return err;
1156 
1157         if (tb[CTA_TUPLE_ZONE]) {
1158                 if (!zone)
1159                         return -EINVAL;
1160 
1161                 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1162                                                  type, zone);
1163                 if (err < 0)
1164                         return err;
1165         }
1166 
1167         /* orig and expect tuples get DIR_ORIGINAL */
1168         if (type == CTA_TUPLE_REPLY)
1169                 tuple->dst.dir = IP_CT_DIR_REPLY;
1170         else
1171                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1172 
1173         return 0;
1174 }
1175 
1176 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1177         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING,
1178                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
1179 };
1180 
1181 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1182                                 struct nlattr **helpinfo)
1183 {
1184         int err;
1185         struct nlattr *tb[CTA_HELP_MAX+1];
1186 
1187         err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1188                                           help_nla_policy, NULL);
1189         if (err < 0)
1190                 return err;
1191 
1192         if (!tb[CTA_HELP_NAME])
1193                 return -EINVAL;
1194 
1195         *helper_name = nla_data(tb[CTA_HELP_NAME]);
1196 
1197         if (tb[CTA_HELP_INFO])
1198                 *helpinfo = tb[CTA_HELP_INFO];
1199 
1200         return 0;
1201 }
1202 
1203 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1204         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
1205         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
1206         [CTA_STATUS]            = { .type = NLA_U32 },
1207         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
1208         [CTA_HELP]              = { .type = NLA_NESTED },
1209         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
1210         [CTA_TIMEOUT]           = { .type = NLA_U32 },
1211         [CTA_MARK]              = { .type = NLA_U32 },
1212         [CTA_ID]                = { .type = NLA_U32 },
1213         [CTA_NAT_DST]           = { .type = NLA_NESTED },
1214         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
1215         [CTA_NAT_SEQ_ADJ_ORIG]  = { .type = NLA_NESTED },
1216         [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1217         [CTA_ZONE]              = { .type = NLA_U16 },
1218         [CTA_MARK_MASK]         = { .type = NLA_U32 },
1219         [CTA_LABELS]            = { .type = NLA_BINARY,
1220                                     .len = NF_CT_LABELS_MAX_SIZE },
1221         [CTA_LABELS_MASK]       = { .type = NLA_BINARY,
1222                                     .len = NF_CT_LABELS_MAX_SIZE },
1223 };
1224 
1225 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1226 {
1227         if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1228                 return 0;
1229 
1230         return ctnetlink_filter_match(ct, data);
1231 }
1232 
1233 static int ctnetlink_flush_conntrack(struct net *net,
1234                                      const struct nlattr * const cda[],
1235                                      u32 portid, int report, u8 family)
1236 {
1237         struct ctnetlink_filter *filter = NULL;
1238 
1239         if (family || (cda[CTA_MARK] && cda[CTA_MARK_MASK])) {
1240                 filter = ctnetlink_alloc_filter(cda, family);
1241                 if (IS_ERR(filter))
1242                         return PTR_ERR(filter);
1243         }
1244 
1245         nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1246                                   portid, report);
1247         kfree(filter);
1248 
1249         return 0;
1250 }
1251 
1252 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1253                                    struct sk_buff *skb,
1254                                    const struct nlmsghdr *nlh,
1255                                    const struct nlattr * const cda[],
1256                                    struct netlink_ext_ack *extack)
1257 {
1258         struct nf_conntrack_tuple_hash *h;
1259         struct nf_conntrack_tuple tuple;
1260         struct nf_conn *ct;
1261         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1262         struct nf_conntrack_zone zone;
1263         int err;
1264 
1265         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1266         if (err < 0)
1267                 return err;
1268 
1269         if (cda[CTA_TUPLE_ORIG])
1270                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1271                                             nfmsg->nfgen_family, &zone);
1272         else if (cda[CTA_TUPLE_REPLY])
1273                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1274                                             nfmsg->nfgen_family, &zone);
1275         else {
1276                 u_int8_t u3 = nfmsg->version ? nfmsg->nfgen_family : AF_UNSPEC;
1277 
1278                 return ctnetlink_flush_conntrack(net, cda,
1279                                                  NETLINK_CB(skb).portid,
1280                                                  nlmsg_report(nlh), u3);
1281         }
1282 
1283         if (err < 0)
1284                 return err;
1285 
1286         h = nf_conntrack_find_get(net, &zone, &tuple);
1287         if (!h)
1288                 return -ENOENT;
1289 
1290         ct = nf_ct_tuplehash_to_ctrack(h);
1291 
1292         if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1293                 nf_ct_put(ct);
1294                 return -EBUSY;
1295         }
1296 
1297         if (cda[CTA_ID]) {
1298                 __be32 id = nla_get_be32(cda[CTA_ID]);
1299 
1300                 if (id != (__force __be32)nf_ct_get_id(ct)) {
1301                         nf_ct_put(ct);
1302                         return -ENOENT;
1303                 }
1304         }
1305 
1306         nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1307         nf_ct_put(ct);
1308 
1309         return 0;
1310 }
1311 
1312 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1313                                    struct sk_buff *skb,
1314                                    const struct nlmsghdr *nlh,
1315                                    const struct nlattr * const cda[],
1316                                    struct netlink_ext_ack *extack)
1317 {
1318         struct nf_conntrack_tuple_hash *h;
1319         struct nf_conntrack_tuple tuple;
1320         struct nf_conn *ct;
1321         struct sk_buff *skb2 = NULL;
1322         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1323         u_int8_t u3 = nfmsg->nfgen_family;
1324         struct nf_conntrack_zone zone;
1325         int err;
1326 
1327         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1328                 struct netlink_dump_control c = {
1329                         .start = ctnetlink_start,
1330                         .dump = ctnetlink_dump_table,
1331                         .done = ctnetlink_done,
1332                         .data = (void *)cda,
1333                 };
1334 
1335                 return netlink_dump_start(ctnl, skb, nlh, &c);
1336         }
1337 
1338         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1339         if (err < 0)
1340                 return err;
1341 
1342         if (cda[CTA_TUPLE_ORIG])
1343                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1344                                             u3, &zone);
1345         else if (cda[CTA_TUPLE_REPLY])
1346                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1347                                             u3, &zone);
1348         else
1349                 return -EINVAL;
1350 
1351         if (err < 0)
1352                 return err;
1353 
1354         h = nf_conntrack_find_get(net, &zone, &tuple);
1355         if (!h)
1356                 return -ENOENT;
1357 
1358         ct = nf_ct_tuplehash_to_ctrack(h);
1359 
1360         err = -ENOMEM;
1361         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1362         if (skb2 == NULL) {
1363                 nf_ct_put(ct);
1364                 return -ENOMEM;
1365         }
1366 
1367         rcu_read_lock();
1368         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1369                                   NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1370         rcu_read_unlock();
1371         nf_ct_put(ct);
1372         if (err <= 0)
1373                 goto free;
1374 
1375         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1376         if (err < 0)
1377                 goto out;
1378 
1379         return 0;
1380 
1381 free:
1382         kfree_skb(skb2);
1383 out:
1384         /* this avoids a loop in nfnetlink. */
1385         return err == -EAGAIN ? -ENOBUFS : err;
1386 }
1387 
1388 static int ctnetlink_done_list(struct netlink_callback *cb)
1389 {
1390         if (cb->args[1])
1391                 nf_ct_put((struct nf_conn *)cb->args[1]);
1392         return 0;
1393 }
1394 
1395 static int
1396 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1397 {
1398         struct nf_conn *ct, *last;
1399         struct nf_conntrack_tuple_hash *h;
1400         struct hlist_nulls_node *n;
1401         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1402         u_int8_t l3proto = nfmsg->nfgen_family;
1403         int res;
1404         int cpu;
1405         struct hlist_nulls_head *list;
1406         struct net *net = sock_net(skb->sk);
1407 
1408         if (cb->args[2])
1409                 return 0;
1410 
1411         last = (struct nf_conn *)cb->args[1];
1412 
1413         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1414                 struct ct_pcpu *pcpu;
1415 
1416                 if (!cpu_possible(cpu))
1417                         continue;
1418 
1419                 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1420                 spin_lock_bh(&pcpu->lock);
1421                 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1422 restart:
1423                 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1424                         ct = nf_ct_tuplehash_to_ctrack(h);
1425                         if (l3proto && nf_ct_l3num(ct) != l3proto)
1426                                 continue;
1427                         if (cb->args[1]) {
1428                                 if (ct != last)
1429                                         continue;
1430                                 cb->args[1] = 0;
1431                         }
1432                         rcu_read_lock();
1433                         res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1434                                                   cb->nlh->nlmsg_seq,
1435                                                   NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1436                                                   ct);
1437                         rcu_read_unlock();
1438                         if (res < 0) {
1439                                 if (!atomic_inc_not_zero(&ct->ct_general.use))
1440                                         continue;
1441                                 cb->args[0] = cpu;
1442                                 cb->args[1] = (unsigned long)ct;
1443                                 spin_unlock_bh(&pcpu->lock);
1444                                 goto out;
1445                         }
1446                 }
1447                 if (cb->args[1]) {
1448                         cb->args[1] = 0;
1449                         goto restart;
1450                 }
1451                 spin_unlock_bh(&pcpu->lock);
1452         }
1453         cb->args[2] = 1;
1454 out:
1455         if (last)
1456                 nf_ct_put(last);
1457 
1458         return skb->len;
1459 }
1460 
1461 static int
1462 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1463 {
1464         return ctnetlink_dump_list(skb, cb, true);
1465 }
1466 
1467 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1468                                   struct sk_buff *skb,
1469                                   const struct nlmsghdr *nlh,
1470                                   const struct nlattr * const cda[],
1471                                   struct netlink_ext_ack *extack)
1472 {
1473         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1474                 struct netlink_dump_control c = {
1475                         .dump = ctnetlink_dump_dying,
1476                         .done = ctnetlink_done_list,
1477                 };
1478                 return netlink_dump_start(ctnl, skb, nlh, &c);
1479         }
1480 
1481         return -EOPNOTSUPP;
1482 }
1483 
1484 static int
1485 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1486 {
1487         return ctnetlink_dump_list(skb, cb, false);
1488 }
1489 
1490 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1491                                         struct sk_buff *skb,
1492                                         const struct nlmsghdr *nlh,
1493                                         const struct nlattr * const cda[],
1494                                         struct netlink_ext_ack *extack)
1495 {
1496         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1497                 struct netlink_dump_control c = {
1498                         .dump = ctnetlink_dump_unconfirmed,
1499                         .done = ctnetlink_done_list,
1500                 };
1501                 return netlink_dump_start(ctnl, skb, nlh, &c);
1502         }
1503 
1504         return -EOPNOTSUPP;
1505 }
1506 
1507 #if IS_ENABLED(CONFIG_NF_NAT)
1508 static int
1509 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1510                           enum nf_nat_manip_type manip,
1511                           const struct nlattr *attr)
1512 {
1513         struct nf_nat_hook *nat_hook;
1514         int err;
1515 
1516         nat_hook = rcu_dereference(nf_nat_hook);
1517         if (!nat_hook) {
1518 #ifdef CONFIG_MODULES
1519                 rcu_read_unlock();
1520                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1521                 if (request_module("nf-nat") < 0) {
1522                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1523                         rcu_read_lock();
1524                         return -EOPNOTSUPP;
1525                 }
1526                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1527                 rcu_read_lock();
1528                 nat_hook = rcu_dereference(nf_nat_hook);
1529                 if (nat_hook)
1530                         return -EAGAIN;
1531 #endif
1532                 return -EOPNOTSUPP;
1533         }
1534 
1535         err = nat_hook->parse_nat_setup(ct, manip, attr);
1536         if (err == -EAGAIN) {
1537 #ifdef CONFIG_MODULES
1538                 rcu_read_unlock();
1539                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1540                 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1541                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1542                         rcu_read_lock();
1543                         return -EOPNOTSUPP;
1544                 }
1545                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1546                 rcu_read_lock();
1547 #else
1548                 err = -EOPNOTSUPP;
1549 #endif
1550         }
1551         return err;
1552 }
1553 #endif
1554 
1555 static void
1556 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1557                           unsigned long off)
1558 {
1559         unsigned int bit;
1560 
1561         /* Ignore these unchangable bits */
1562         on &= ~IPS_UNCHANGEABLE_MASK;
1563         off &= ~IPS_UNCHANGEABLE_MASK;
1564 
1565         for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1566                 if (on & (1 << bit))
1567                         set_bit(bit, &ct->status);
1568                 else if (off & (1 << bit))
1569                         clear_bit(bit, &ct->status);
1570         }
1571 }
1572 
1573 static int
1574 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1575 {
1576         unsigned long d;
1577         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1578         d = ct->status ^ status;
1579 
1580         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1581                 /* unchangeable */
1582                 return -EBUSY;
1583 
1584         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1585                 /* SEEN_REPLY bit can only be set */
1586                 return -EBUSY;
1587 
1588         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1589                 /* ASSURED bit can only be set */
1590                 return -EBUSY;
1591 
1592         __ctnetlink_change_status(ct, status, 0);
1593         return 0;
1594 }
1595 
1596 static int
1597 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1598 {
1599 #if IS_ENABLED(CONFIG_NF_NAT)
1600         int ret;
1601 
1602         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1603                 return 0;
1604 
1605         ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1606                                         cda[CTA_NAT_DST]);
1607         if (ret < 0)
1608                 return ret;
1609 
1610         return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1611                                          cda[CTA_NAT_SRC]);
1612 #else
1613         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1614                 return 0;
1615         return -EOPNOTSUPP;
1616 #endif
1617 }
1618 
1619 static int ctnetlink_change_helper(struct nf_conn *ct,
1620                                    const struct nlattr * const cda[])
1621 {
1622         struct nf_conntrack_helper *helper;
1623         struct nf_conn_help *help = nfct_help(ct);
1624         char *helpname = NULL;
1625         struct nlattr *helpinfo = NULL;
1626         int err;
1627 
1628         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1629         if (err < 0)
1630                 return err;
1631 
1632         /* don't change helper of sibling connections */
1633         if (ct->master) {
1634                 /* If we try to change the helper to the same thing twice,
1635                  * treat the second attempt as a no-op instead of returning
1636                  * an error.
1637                  */
1638                 err = -EBUSY;
1639                 if (help) {
1640                         rcu_read_lock();
1641                         helper = rcu_dereference(help->helper);
1642                         if (helper && !strcmp(helper->name, helpname))
1643                                 err = 0;
1644                         rcu_read_unlock();
1645                 }
1646 
1647                 return err;
1648         }
1649 
1650         if (!strcmp(helpname, "")) {
1651                 if (help && help->helper) {
1652                         /* we had a helper before ... */
1653                         nf_ct_remove_expectations(ct);
1654                         RCU_INIT_POINTER(help->helper, NULL);
1655                 }
1656 
1657                 return 0;
1658         }
1659 
1660         rcu_read_lock();
1661         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1662                                             nf_ct_protonum(ct));
1663         if (helper == NULL) {
1664                 rcu_read_unlock();
1665                 return -EOPNOTSUPP;
1666         }
1667 
1668         if (help) {
1669                 if (help->helper == helper) {
1670                         /* update private helper data if allowed. */
1671                         if (helper->from_nlattr)
1672                                 helper->from_nlattr(helpinfo, ct);
1673                         err = 0;
1674                 } else
1675                         err = -EBUSY;
1676         } else {
1677                 /* we cannot set a helper for an existing conntrack */
1678                 err = -EOPNOTSUPP;
1679         }
1680 
1681         rcu_read_unlock();
1682         return err;
1683 }
1684 
1685 static int ctnetlink_change_timeout(struct nf_conn *ct,
1686                                     const struct nlattr * const cda[])
1687 {
1688         u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1689 
1690         if (timeout > INT_MAX)
1691                 timeout = INT_MAX;
1692         ct->timeout = nfct_time_stamp + (u32)timeout;
1693 
1694         if (test_bit(IPS_DYING_BIT, &ct->status))
1695                 return -ETIME;
1696 
1697         return 0;
1698 }
1699 
1700 #if defined(CONFIG_NF_CONNTRACK_MARK)
1701 static void ctnetlink_change_mark(struct nf_conn *ct,
1702                                     const struct nlattr * const cda[])
1703 {
1704         u32 mark, newmark, mask = 0;
1705 
1706         if (cda[CTA_MARK_MASK])
1707                 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1708 
1709         mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1710         newmark = (ct->mark & mask) ^ mark;
1711         if (newmark != ct->mark)
1712                 ct->mark = newmark;
1713 }
1714 #endif
1715 
1716 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1717         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1718         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1719         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1720 };
1721 
1722 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1723                                       const struct nlattr * const cda[])
1724 {
1725         const struct nlattr *attr = cda[CTA_PROTOINFO];
1726         const struct nf_conntrack_l4proto *l4proto;
1727         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1728         int err = 0;
1729 
1730         err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
1731                                           protoinfo_policy, NULL);
1732         if (err < 0)
1733                 return err;
1734 
1735         l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
1736         if (l4proto->from_nlattr)
1737                 err = l4proto->from_nlattr(tb, ct);
1738 
1739         return err;
1740 }
1741 
1742 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1743         [CTA_SEQADJ_CORRECTION_POS]     = { .type = NLA_U32 },
1744         [CTA_SEQADJ_OFFSET_BEFORE]      = { .type = NLA_U32 },
1745         [CTA_SEQADJ_OFFSET_AFTER]       = { .type = NLA_U32 },
1746 };
1747 
1748 static int change_seq_adj(struct nf_ct_seqadj *seq,
1749                           const struct nlattr * const attr)
1750 {
1751         int err;
1752         struct nlattr *cda[CTA_SEQADJ_MAX+1];
1753 
1754         err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
1755                                           seqadj_policy, NULL);
1756         if (err < 0)
1757                 return err;
1758 
1759         if (!cda[CTA_SEQADJ_CORRECTION_POS])
1760                 return -EINVAL;
1761 
1762         seq->correction_pos =
1763                 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1764 
1765         if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1766                 return -EINVAL;
1767 
1768         seq->offset_before =
1769                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1770 
1771         if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1772                 return -EINVAL;
1773 
1774         seq->offset_after =
1775                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1776 
1777         return 0;
1778 }
1779 
1780 static int
1781 ctnetlink_change_seq_adj(struct nf_conn *ct,
1782                          const struct nlattr * const cda[])
1783 {
1784         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1785         int ret = 0;
1786 
1787         if (!seqadj)
1788                 return 0;
1789 
1790         spin_lock_bh(&ct->lock);
1791         if (cda[CTA_SEQ_ADJ_ORIG]) {
1792                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1793                                      cda[CTA_SEQ_ADJ_ORIG]);
1794                 if (ret < 0)
1795                         goto err;
1796 
1797                 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1798         }
1799 
1800         if (cda[CTA_SEQ_ADJ_REPLY]) {
1801                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1802                                      cda[CTA_SEQ_ADJ_REPLY]);
1803                 if (ret < 0)
1804                         goto err;
1805 
1806                 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1807         }
1808 
1809         spin_unlock_bh(&ct->lock);
1810         return 0;
1811 err:
1812         spin_unlock_bh(&ct->lock);
1813         return ret;
1814 }
1815 
1816 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
1817         [CTA_SYNPROXY_ISN]      = { .type = NLA_U32 },
1818         [CTA_SYNPROXY_ITS]      = { .type = NLA_U32 },
1819         [CTA_SYNPROXY_TSOFF]    = { .type = NLA_U32 },
1820 };
1821 
1822 static int ctnetlink_change_synproxy(struct nf_conn *ct,
1823                                      const struct nlattr * const cda[])
1824 {
1825         struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
1826         struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
1827         int err;
1828 
1829         if (!synproxy)
1830                 return 0;
1831 
1832         err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
1833                                           cda[CTA_SYNPROXY], synproxy_policy,
1834                                           NULL);
1835         if (err < 0)
1836                 return err;
1837 
1838         if (!tb[CTA_SYNPROXY_ISN] ||
1839             !tb[CTA_SYNPROXY_ITS] ||
1840             !tb[CTA_SYNPROXY_TSOFF])
1841                 return -EINVAL;
1842 
1843         synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
1844         synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
1845         synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
1846 
1847         return 0;
1848 }
1849 
1850 static int
1851 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1852 {
1853 #ifdef CONFIG_NF_CONNTRACK_LABELS
1854         size_t len = nla_len(cda[CTA_LABELS]);
1855         const void *mask = cda[CTA_LABELS_MASK];
1856 
1857         if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1858                 return -EINVAL;
1859 
1860         if (mask) {
1861                 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1862                     nla_len(cda[CTA_LABELS_MASK]) != len)
1863                         return -EINVAL;
1864                 mask = nla_data(cda[CTA_LABELS_MASK]);
1865         }
1866 
1867         len /= sizeof(u32);
1868 
1869         return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1870 #else
1871         return -EOPNOTSUPP;
1872 #endif
1873 }
1874 
1875 static int
1876 ctnetlink_change_conntrack(struct nf_conn *ct,
1877                            const struct nlattr * const cda[])
1878 {
1879         int err;
1880 
1881         /* only allow NAT changes and master assignation for new conntracks */
1882         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1883                 return -EOPNOTSUPP;
1884 
1885         if (cda[CTA_HELP]) {
1886                 err = ctnetlink_change_helper(ct, cda);
1887                 if (err < 0)
1888                         return err;
1889         }
1890 
1891         if (cda[CTA_TIMEOUT]) {
1892                 err = ctnetlink_change_timeout(ct, cda);
1893                 if (err < 0)
1894                         return err;
1895         }
1896 
1897         if (cda[CTA_STATUS]) {
1898                 err = ctnetlink_change_status(ct, cda);
1899                 if (err < 0)
1900                         return err;
1901         }
1902 
1903         if (cda[CTA_PROTOINFO]) {
1904                 err = ctnetlink_change_protoinfo(ct, cda);
1905                 if (err < 0)
1906                         return err;
1907         }
1908 
1909 #if defined(CONFIG_NF_CONNTRACK_MARK)
1910         if (cda[CTA_MARK])
1911                 ctnetlink_change_mark(ct, cda);
1912 #endif
1913 
1914         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1915                 err = ctnetlink_change_seq_adj(ct, cda);
1916                 if (err < 0)
1917                         return err;
1918         }
1919 
1920         if (cda[CTA_SYNPROXY]) {
1921                 err = ctnetlink_change_synproxy(ct, cda);
1922                 if (err < 0)
1923                         return err;
1924         }
1925 
1926         if (cda[CTA_LABELS]) {
1927                 err = ctnetlink_attach_labels(ct, cda);
1928                 if (err < 0)
1929                         return err;
1930         }
1931 
1932         return 0;
1933 }
1934 
1935 static struct nf_conn *
1936 ctnetlink_create_conntrack(struct net *net,
1937                            const struct nf_conntrack_zone *zone,
1938                            const struct nlattr * const cda[],
1939                            struct nf_conntrack_tuple *otuple,
1940                            struct nf_conntrack_tuple *rtuple,
1941                            u8 u3)
1942 {
1943         struct nf_conn *ct;
1944         int err = -EINVAL;
1945         struct nf_conntrack_helper *helper;
1946         struct nf_conn_tstamp *tstamp;
1947         u64 timeout;
1948 
1949         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1950         if (IS_ERR(ct))
1951                 return ERR_PTR(-ENOMEM);
1952 
1953         if (!cda[CTA_TIMEOUT])
1954                 goto err1;
1955 
1956         timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1957         if (timeout > INT_MAX)
1958                 timeout = INT_MAX;
1959         ct->timeout = (u32)timeout + nfct_time_stamp;
1960 
1961         rcu_read_lock();
1962         if (cda[CTA_HELP]) {
1963                 char *helpname = NULL;
1964                 struct nlattr *helpinfo = NULL;
1965 
1966                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1967                 if (err < 0)
1968                         goto err2;
1969 
1970                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1971                                                     nf_ct_protonum(ct));
1972                 if (helper == NULL) {
1973                         rcu_read_unlock();
1974 #ifdef CONFIG_MODULES
1975                         if (request_module("nfct-helper-%s", helpname) < 0) {
1976                                 err = -EOPNOTSUPP;
1977                                 goto err1;
1978                         }
1979 
1980                         rcu_read_lock();
1981                         helper = __nf_conntrack_helper_find(helpname,
1982                                                             nf_ct_l3num(ct),
1983                                                             nf_ct_protonum(ct));
1984                         if (helper) {
1985                                 err = -EAGAIN;
1986                                 goto err2;
1987                         }
1988                         rcu_read_unlock();
1989 #endif
1990                         err = -EOPNOTSUPP;
1991                         goto err1;
1992                 } else {
1993                         struct nf_conn_help *help;
1994 
1995                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1996                         if (help == NULL) {
1997                                 err = -ENOMEM;
1998                                 goto err2;
1999                         }
2000                         /* set private helper data if allowed. */
2001                         if (helper->from_nlattr)
2002                                 helper->from_nlattr(helpinfo, ct);
2003 
2004                         /* not in hash table yet so not strictly necessary */
2005                         RCU_INIT_POINTER(help->helper, helper);
2006                 }
2007         } else {
2008                 /* try an implicit helper assignation */
2009                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2010                 if (err < 0)
2011                         goto err2;
2012         }
2013 
2014         err = ctnetlink_setup_nat(ct, cda);
2015         if (err < 0)
2016                 goto err2;
2017 
2018         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2019         nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2020         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2021         nf_ct_labels_ext_add(ct);
2022         nfct_seqadj_ext_add(ct);
2023         nfct_synproxy_ext_add(ct);
2024 
2025         /* we must add conntrack extensions before confirmation. */
2026         ct->status |= IPS_CONFIRMED;
2027 
2028         if (cda[CTA_STATUS]) {
2029                 err = ctnetlink_change_status(ct, cda);
2030                 if (err < 0)
2031                         goto err2;
2032         }
2033 
2034         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2035                 err = ctnetlink_change_seq_adj(ct, cda);
2036                 if (err < 0)
2037                         goto err2;
2038         }
2039 
2040         memset(&ct->proto, 0, sizeof(ct->proto));
2041         if (cda[CTA_PROTOINFO]) {
2042                 err = ctnetlink_change_protoinfo(ct, cda);
2043                 if (err < 0)
2044                         goto err2;
2045         }
2046 
2047         if (cda[CTA_SYNPROXY]) {
2048                 err = ctnetlink_change_synproxy(ct, cda);
2049                 if (err < 0)
2050                         goto err2;
2051         }
2052 
2053 #if defined(CONFIG_NF_CONNTRACK_MARK)
2054         if (cda[CTA_MARK])
2055                 ctnetlink_change_mark(ct, cda);
2056 #endif
2057 
2058         /* setup master conntrack: this is a confirmed expectation */
2059         if (cda[CTA_TUPLE_MASTER]) {
2060                 struct nf_conntrack_tuple master;
2061                 struct nf_conntrack_tuple_hash *master_h;
2062                 struct nf_conn *master_ct;
2063 
2064                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2065                                             u3, NULL);
2066                 if (err < 0)
2067                         goto err2;
2068 
2069                 master_h = nf_conntrack_find_get(net, zone, &master);
2070                 if (master_h == NULL) {
2071                         err = -ENOENT;
2072                         goto err2;
2073                 }
2074                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2075                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2076                 ct->master = master_ct;
2077         }
2078         tstamp = nf_conn_tstamp_find(ct);
2079         if (tstamp)
2080                 tstamp->start = ktime_get_real_ns();
2081 
2082         err = nf_conntrack_hash_check_insert(ct);
2083         if (err < 0)
2084                 goto err2;
2085 
2086         rcu_read_unlock();
2087 
2088         return ct;
2089 
2090 err2:
2091         rcu_read_unlock();
2092 err1:
2093         nf_conntrack_free(ct);
2094         return ERR_PTR(err);
2095 }
2096 
2097 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
2098                                    struct sk_buff *skb,
2099                                    const struct nlmsghdr *nlh,
2100                                    const struct nlattr * const cda[],
2101                                    struct netlink_ext_ack *extack)
2102 {
2103         struct nf_conntrack_tuple otuple, rtuple;
2104         struct nf_conntrack_tuple_hash *h = NULL;
2105         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2106         struct nf_conn *ct;
2107         u_int8_t u3 = nfmsg->nfgen_family;
2108         struct nf_conntrack_zone zone;
2109         int err;
2110 
2111         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2112         if (err < 0)
2113                 return err;
2114 
2115         if (cda[CTA_TUPLE_ORIG]) {
2116                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2117                                             u3, &zone);
2118                 if (err < 0)
2119                         return err;
2120         }
2121 
2122         if (cda[CTA_TUPLE_REPLY]) {
2123                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2124                                             u3, &zone);
2125                 if (err < 0)
2126                         return err;
2127         }
2128 
2129         if (cda[CTA_TUPLE_ORIG])
2130                 h = nf_conntrack_find_get(net, &zone, &otuple);
2131         else if (cda[CTA_TUPLE_REPLY])
2132                 h = nf_conntrack_find_get(net, &zone, &rtuple);
2133 
2134         if (h == NULL) {
2135                 err = -ENOENT;
2136                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2137                         enum ip_conntrack_events events;
2138 
2139                         if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2140                                 return -EINVAL;
2141                         if (otuple.dst.protonum != rtuple.dst.protonum)
2142                                 return -EINVAL;
2143 
2144                         ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
2145                                                         &rtuple, u3);
2146                         if (IS_ERR(ct))
2147                                 return PTR_ERR(ct);
2148 
2149                         err = 0;
2150                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2151                                 events = 1 << IPCT_RELATED;
2152                         else
2153                                 events = 1 << IPCT_NEW;
2154 
2155                         if (cda[CTA_LABELS] &&
2156                             ctnetlink_attach_labels(ct, cda) == 0)
2157                                 events |= (1 << IPCT_LABEL);
2158 
2159                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2160                                                       (1 << IPCT_ASSURED) |
2161                                                       (1 << IPCT_HELPER) |
2162                                                       (1 << IPCT_PROTOINFO) |
2163                                                       (1 << IPCT_SEQADJ) |
2164                                                       (1 << IPCT_MARK) |
2165                                                       (1 << IPCT_SYNPROXY) |
2166                                                       events,
2167                                                       ct, NETLINK_CB(skb).portid,
2168                                                       nlmsg_report(nlh));
2169                         nf_ct_put(ct);
2170                 }
2171 
2172                 return err;
2173         }
2174         /* implicit 'else' */
2175 
2176         err = -EEXIST;
2177         ct = nf_ct_tuplehash_to_ctrack(h);
2178         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
2179                 err = ctnetlink_change_conntrack(ct, cda);
2180                 if (err == 0) {
2181                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2182                                                       (1 << IPCT_ASSURED) |
2183                                                       (1 << IPCT_HELPER) |
2184                                                       (1 << IPCT_LABEL) |
2185                                                       (1 << IPCT_PROTOINFO) |
2186                                                       (1 << IPCT_SEQADJ) |
2187                                                       (1 << IPCT_MARK) |
2188                                                       (1 << IPCT_SYNPROXY),
2189                                                       ct, NETLINK_CB(skb).portid,
2190                                                       nlmsg_report(nlh));
2191                 }
2192         }
2193 
2194         nf_ct_put(ct);
2195         return err;
2196 }
2197 
2198 static int
2199 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2200                                 __u16 cpu, const struct ip_conntrack_stat *st)
2201 {
2202         struct nlmsghdr *nlh;
2203         struct nfgenmsg *nfmsg;
2204         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2205 
2206         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2207                               IPCTNL_MSG_CT_GET_STATS_CPU);
2208         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2209         if (nlh == NULL)
2210                 goto nlmsg_failure;
2211 
2212         nfmsg = nlmsg_data(nlh);
2213         nfmsg->nfgen_family = AF_UNSPEC;
2214         nfmsg->version      = NFNETLINK_V0;
2215         nfmsg->res_id       = htons(cpu);
2216 
2217         if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2218             nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2219             nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
2220             nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2221             nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2222                                 htonl(st->insert_failed)) ||
2223             nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2224             nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2225             nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2226             nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2227                                 htonl(st->search_restart)))
2228                 goto nla_put_failure;
2229 
2230         nlmsg_end(skb, nlh);
2231         return skb->len;
2232 
2233 nla_put_failure:
2234 nlmsg_failure:
2235         nlmsg_cancel(skb, nlh);
2236         return -1;
2237 }
2238 
2239 static int
2240 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2241 {
2242         int cpu;
2243         struct net *net = sock_net(skb->sk);
2244 
2245         if (cb->args[0] == nr_cpu_ids)
2246                 return 0;
2247 
2248         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2249                 const struct ip_conntrack_stat *st;
2250 
2251                 if (!cpu_possible(cpu))
2252                         continue;
2253 
2254                 st = per_cpu_ptr(net->ct.stat, cpu);
2255                 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2256                                                     NETLINK_CB(cb->skb).portid,
2257                                                     cb->nlh->nlmsg_seq,
2258                                                     cpu, st) < 0)
2259                                 break;
2260         }
2261         cb->args[0] = cpu;
2262 
2263         return skb->len;
2264 }
2265 
2266 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2267                                  struct sk_buff *skb,
2268                                  const struct nlmsghdr *nlh,
2269                                  const struct nlattr * const cda[],
2270                                  struct netlink_ext_ack *extack)
2271 {
2272         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2273                 struct netlink_dump_control c = {
2274                         .dump = ctnetlink_ct_stat_cpu_dump,
2275                 };
2276                 return netlink_dump_start(ctnl, skb, nlh, &c);
2277         }
2278 
2279         return 0;
2280 }
2281 
2282 static int
2283 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2284                             struct net *net)
2285 {
2286         struct nlmsghdr *nlh;
2287         struct nfgenmsg *nfmsg;
2288         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2289         unsigned int nr_conntracks = atomic_read(&net->ct.count);
2290 
2291         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2292         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2293         if (nlh == NULL)
2294                 goto nlmsg_failure;
2295 
2296         nfmsg = nlmsg_data(nlh);
2297         nfmsg->nfgen_family = AF_UNSPEC;
2298         nfmsg->version      = NFNETLINK_V0;
2299         nfmsg->res_id       = 0;
2300 
2301         if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2302                 goto nla_put_failure;
2303 
2304         if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2305                 goto nla_put_failure;
2306 
2307         nlmsg_end(skb, nlh);
2308         return skb->len;
2309 
2310 nla_put_failure:
2311 nlmsg_failure:
2312         nlmsg_cancel(skb, nlh);
2313         return -1;
2314 }
2315 
2316 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2317                              struct sk_buff *skb, const struct nlmsghdr *nlh,
2318                              const struct nlattr * const cda[],
2319                              struct netlink_ext_ack *extack)
2320 {
2321         struct sk_buff *skb2;
2322         int err;
2323 
2324         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2325         if (skb2 == NULL)
2326                 return -ENOMEM;
2327 
2328         err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2329                                           nlh->nlmsg_seq,
2330                                           NFNL_MSG_TYPE(nlh->nlmsg_type),
2331                                           sock_net(skb->sk));
2332         if (err <= 0)
2333                 goto free;
2334 
2335         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2336         if (err < 0)
2337                 goto out;
2338 
2339         return 0;
2340 
2341 free:
2342         kfree_skb(skb2);
2343 out:
2344         /* this avoids a loop in nfnetlink. */
2345         return err == -EAGAIN ? -ENOBUFS : err;
2346 }
2347 
2348 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2349         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
2350         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
2351         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
2352         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
2353         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
2354         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING,
2355                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
2356         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
2357         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
2358         [CTA_EXPECT_CLASS]      = { .type = NLA_U32 },
2359         [CTA_EXPECT_NAT]        = { .type = NLA_NESTED },
2360         [CTA_EXPECT_FN]         = { .type = NLA_NUL_STRING },
2361 };
2362 
2363 static struct nf_conntrack_expect *
2364 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2365                        struct nf_conntrack_helper *helper,
2366                        struct nf_conntrack_tuple *tuple,
2367                        struct nf_conntrack_tuple *mask);
2368 
2369 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2370 static size_t
2371 ctnetlink_glue_build_size(const struct nf_conn *ct)
2372 {
2373         return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2374                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2375                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2376                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2377                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2378                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2379                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2380                + nla_total_size(0) /* CTA_PROTOINFO */
2381                + nla_total_size(0) /* CTA_HELP */
2382                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2383                + ctnetlink_secctx_size(ct)
2384 #if IS_ENABLED(CONFIG_NF_NAT)
2385                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2386                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2387 #endif
2388 #ifdef CONFIG_NF_CONNTRACK_MARK
2389                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2390 #endif
2391 #ifdef CONFIG_NF_CONNTRACK_ZONES
2392                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2393 #endif
2394                + ctnetlink_proto_size(ct)
2395                ;
2396 }
2397 
2398 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2399                                              enum ip_conntrack_info *ctinfo)
2400 {
2401         return nf_ct_get(skb, ctinfo);
2402 }
2403 
2404 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2405 {
2406         const struct nf_conntrack_zone *zone;
2407         struct nlattr *nest_parms;
2408 
2409         zone = nf_ct_zone(ct);
2410 
2411         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2412         if (!nest_parms)
2413                 goto nla_put_failure;
2414         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2415                 goto nla_put_failure;
2416         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2417                                    NF_CT_ZONE_DIR_ORIG) < 0)
2418                 goto nla_put_failure;
2419         nla_nest_end(skb, nest_parms);
2420 
2421         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2422         if (!nest_parms)
2423                 goto nla_put_failure;
2424         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2425                 goto nla_put_failure;
2426         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2427                                    NF_CT_ZONE_DIR_REPL) < 0)
2428                 goto nla_put_failure;
2429         nla_nest_end(skb, nest_parms);
2430 
2431         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2432                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
2433                 goto nla_put_failure;
2434 
2435         if (ctnetlink_dump_id(skb, ct) < 0)
2436                 goto nla_put_failure;
2437 
2438         if (ctnetlink_dump_status(skb, ct) < 0)
2439                 goto nla_put_failure;
2440 
2441         if (ctnetlink_dump_timeout(skb, ct) < 0)
2442                 goto nla_put_failure;
2443 
2444         if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2445                 goto nla_put_failure;
2446 
2447         if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2448                 goto nla_put_failure;
2449 
2450 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2451         if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2452                 goto nla_put_failure;
2453 #endif
2454         if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2455                 goto nla_put_failure;
2456 
2457         if ((ct->status & IPS_SEQ_ADJUST) &&
2458             ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2459                 goto nla_put_failure;
2460 
2461         if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2462                 goto nla_put_failure;
2463 
2464 #ifdef CONFIG_NF_CONNTRACK_MARK
2465         if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2466                 goto nla_put_failure;
2467 #endif
2468         if (ctnetlink_dump_labels(skb, ct) < 0)
2469                 goto nla_put_failure;
2470         return 0;
2471 
2472 nla_put_failure:
2473         return -ENOSPC;
2474 }
2475 
2476 static int
2477 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2478                      enum ip_conntrack_info ctinfo,
2479                      u_int16_t ct_attr, u_int16_t ct_info_attr)
2480 {
2481         struct nlattr *nest_parms;
2482 
2483         nest_parms = nla_nest_start(skb, ct_attr);
2484         if (!nest_parms)
2485                 goto nla_put_failure;
2486 
2487         if (__ctnetlink_glue_build(skb, ct) < 0)
2488                 goto nla_put_failure;
2489 
2490         nla_nest_end(skb, nest_parms);
2491 
2492         if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2493                 goto nla_put_failure;
2494 
2495         return 0;
2496 
2497 nla_put_failure:
2498         return -ENOSPC;
2499 }
2500 
2501 static int
2502 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2503 {
2504         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2505         unsigned long d = ct->status ^ status;
2506 
2507         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2508                 /* SEEN_REPLY bit can only be set */
2509                 return -EBUSY;
2510 
2511         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2512                 /* ASSURED bit can only be set */
2513                 return -EBUSY;
2514 
2515         /* This check is less strict than ctnetlink_change_status()
2516          * because callers often flip IPS_EXPECTED bits when sending
2517          * an NFQA_CT attribute to the kernel.  So ignore the
2518          * unchangeable bits but do not error out. Also user programs
2519          * are allowed to clear the bits that they are allowed to change.
2520          */
2521         __ctnetlink_change_status(ct, status, ~status);
2522         return 0;
2523 }
2524 
2525 static int
2526 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2527 {
2528         int err;
2529 
2530         if (cda[CTA_TIMEOUT]) {
2531                 err = ctnetlink_change_timeout(ct, cda);
2532                 if (err < 0)
2533                         return err;
2534         }
2535         if (cda[CTA_STATUS]) {
2536                 err = ctnetlink_update_status(ct, cda);
2537                 if (err < 0)
2538                         return err;
2539         }
2540         if (cda[CTA_HELP]) {
2541                 err = ctnetlink_change_helper(ct, cda);
2542                 if (err < 0)
2543                         return err;
2544         }
2545         if (cda[CTA_LABELS]) {
2546                 err = ctnetlink_attach_labels(ct, cda);
2547                 if (err < 0)
2548                         return err;
2549         }
2550 #if defined(CONFIG_NF_CONNTRACK_MARK)
2551         if (cda[CTA_MARK]) {
2552                 ctnetlink_change_mark(ct, cda);
2553         }
2554 #endif
2555         return 0;
2556 }
2557 
2558 static int
2559 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2560 {
2561         struct nlattr *cda[CTA_MAX+1];
2562         int ret;
2563 
2564         ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2565                                           NULL);
2566         if (ret < 0)
2567                 return ret;
2568 
2569         return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2570 }
2571 
2572 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2573                                     const struct nf_conn *ct,
2574                                     struct nf_conntrack_tuple *tuple,
2575                                     struct nf_conntrack_tuple *mask)
2576 {
2577         int err;
2578 
2579         err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2580                                     nf_ct_l3num(ct), NULL);
2581         if (err < 0)
2582                 return err;
2583 
2584         return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2585                                      nf_ct_l3num(ct), NULL);
2586 }
2587 
2588 static int
2589 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2590                              u32 portid, u32 report)
2591 {
2592         struct nlattr *cda[CTA_EXPECT_MAX+1];
2593         struct nf_conntrack_tuple tuple, mask;
2594         struct nf_conntrack_helper *helper = NULL;
2595         struct nf_conntrack_expect *exp;
2596         int err;
2597 
2598         err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2599                                           exp_nla_policy, NULL);
2600         if (err < 0)
2601                 return err;
2602 
2603         err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2604                                        ct, &tuple, &mask);
2605         if (err < 0)
2606                 return err;
2607 
2608         if (cda[CTA_EXPECT_HELP_NAME]) {
2609                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2610 
2611                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2612                                                     nf_ct_protonum(ct));
2613                 if (helper == NULL)
2614                         return -EOPNOTSUPP;
2615         }
2616 
2617         exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2618                                      helper, &tuple, &mask);
2619         if (IS_ERR(exp))
2620                 return PTR_ERR(exp);
2621 
2622         err = nf_ct_expect_related_report(exp, portid, report, 0);
2623         nf_ct_expect_put(exp);
2624         return err;
2625 }
2626 
2627 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2628                                   enum ip_conntrack_info ctinfo, int diff)
2629 {
2630         if (!(ct->status & IPS_NAT_MASK))
2631                 return;
2632 
2633         nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2634 }
2635 
2636 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2637         .get_ct         = ctnetlink_glue_get_ct,
2638         .build_size     = ctnetlink_glue_build_size,
2639         .build          = ctnetlink_glue_build,
2640         .parse          = ctnetlink_glue_parse,
2641         .attach_expect  = ctnetlink_glue_attach_expect,
2642         .seq_adjust     = ctnetlink_glue_seqadj,
2643 };
2644 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2645 
2646 /***********************************************************************
2647  * EXPECT
2648  ***********************************************************************/
2649 
2650 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2651                                     const struct nf_conntrack_tuple *tuple,
2652                                     u32 type)
2653 {
2654         struct nlattr *nest_parms;
2655 
2656         nest_parms = nla_nest_start(skb, type);
2657         if (!nest_parms)
2658                 goto nla_put_failure;
2659         if (ctnetlink_dump_tuples(skb, tuple) < 0)
2660                 goto nla_put_failure;
2661         nla_nest_end(skb, nest_parms);
2662 
2663         return 0;
2664 
2665 nla_put_failure:
2666         return -1;
2667 }
2668 
2669 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2670                                    const struct nf_conntrack_tuple *tuple,
2671                                    const struct nf_conntrack_tuple_mask *mask)
2672 {
2673         const struct nf_conntrack_l4proto *l4proto;
2674         struct nf_conntrack_tuple m;
2675         struct nlattr *nest_parms;
2676         int ret;
2677 
2678         memset(&m, 0xFF, sizeof(m));
2679         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2680         m.src.u.all = mask->src.u.all;
2681         m.dst.protonum = tuple->dst.protonum;
2682 
2683         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2684         if (!nest_parms)
2685                 goto nla_put_failure;
2686 
2687         rcu_read_lock();
2688         ret = ctnetlink_dump_tuples_ip(skb, &m);
2689         if (ret >= 0) {
2690                 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2691                 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2692         }
2693         rcu_read_unlock();
2694 
2695         if (unlikely(ret < 0))
2696                 goto nla_put_failure;
2697 
2698         nla_nest_end(skb, nest_parms);
2699 
2700         return 0;
2701 
2702 nla_put_failure:
2703         return -1;
2704 }
2705 
2706 static const union nf_inet_addr any_addr;
2707 
2708 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2709 {
2710         static __read_mostly siphash_key_t exp_id_seed;
2711         unsigned long a, b, c, d;
2712 
2713         net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2714 
2715         a = (unsigned long)exp;
2716         b = (unsigned long)exp->helper;
2717         c = (unsigned long)exp->master;
2718         d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
2719 
2720 #ifdef CONFIG_64BIT
2721         return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
2722 #else
2723         return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
2724 #endif
2725 }
2726 
2727 static int
2728 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2729                           const struct nf_conntrack_expect *exp)
2730 {
2731         struct nf_conn *master = exp->master;
2732         long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2733         struct nf_conn_help *help;
2734 #if IS_ENABLED(CONFIG_NF_NAT)
2735         struct nlattr *nest_parms;
2736         struct nf_conntrack_tuple nat_tuple = {};
2737 #endif
2738         struct nf_ct_helper_expectfn *expfn;
2739 
2740         if (timeout < 0)
2741                 timeout = 0;
2742 
2743         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2744                 goto nla_put_failure;
2745         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2746                 goto nla_put_failure;
2747         if (ctnetlink_exp_dump_tuple(skb,
2748                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2749                                  CTA_EXPECT_MASTER) < 0)
2750                 goto nla_put_failure;
2751 
2752 #if IS_ENABLED(CONFIG_NF_NAT)
2753         if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2754             exp->saved_proto.all) {
2755                 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
2756                 if (!nest_parms)
2757                         goto nla_put_failure;
2758 
2759                 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2760                         goto nla_put_failure;
2761 
2762                 nat_tuple.src.l3num = nf_ct_l3num(master);
2763                 nat_tuple.src.u3 = exp->saved_addr;
2764                 nat_tuple.dst.protonum = nf_ct_protonum(master);
2765                 nat_tuple.src.u = exp->saved_proto;
2766 
2767                 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2768                                                 CTA_EXPECT_NAT_TUPLE) < 0)
2769                         goto nla_put_failure;
2770                 nla_nest_end(skb, nest_parms);
2771         }
2772 #endif
2773         if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2774             nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
2775             nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2776             nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2777                 goto nla_put_failure;
2778         help = nfct_help(master);
2779         if (help) {
2780                 struct nf_conntrack_helper *helper;
2781 
2782                 helper = rcu_dereference(help->helper);
2783                 if (helper &&
2784                     nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2785                         goto nla_put_failure;
2786         }
2787         expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2788         if (expfn != NULL &&
2789             nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2790                 goto nla_put_failure;
2791 
2792         return 0;
2793 
2794 nla_put_failure:
2795         return -1;
2796 }
2797 
2798 static int
2799 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2800                         int event, const struct nf_conntrack_expect *exp)
2801 {
2802         struct nlmsghdr *nlh;
2803         struct nfgenmsg *nfmsg;
2804         unsigned int flags = portid ? NLM_F_MULTI : 0;
2805 
2806         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
2807         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2808         if (nlh == NULL)
2809                 goto nlmsg_failure;
2810 
2811         nfmsg = nlmsg_data(nlh);
2812         nfmsg->nfgen_family = exp->tuple.src.l3num;
2813         nfmsg->version      = NFNETLINK_V0;
2814         nfmsg->res_id       = 0;
2815 
2816         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2817                 goto nla_put_failure;
2818 
2819         nlmsg_end(skb, nlh);
2820         return skb->len;
2821 
2822 nlmsg_failure:
2823 nla_put_failure:
2824         nlmsg_cancel(skb, nlh);
2825         return -1;
2826 }
2827 
2828 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2829 static int
2830 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2831 {
2832         struct nf_conntrack_expect *exp = item->exp;
2833         struct net *net = nf_ct_exp_net(exp);
2834         struct nlmsghdr *nlh;
2835         struct nfgenmsg *nfmsg;
2836         struct sk_buff *skb;
2837         unsigned int type, group;
2838         int flags = 0;
2839 
2840         if (events & (1 << IPEXP_DESTROY)) {
2841                 type = IPCTNL_MSG_EXP_DELETE;
2842                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2843         } else if (events & (1 << IPEXP_NEW)) {
2844                 type = IPCTNL_MSG_EXP_NEW;
2845                 flags = NLM_F_CREATE|NLM_F_EXCL;
2846                 group = NFNLGRP_CONNTRACK_EXP_NEW;
2847         } else
2848                 return 0;
2849 
2850         if (!item->report && !nfnetlink_has_listeners(net, group))
2851                 return 0;
2852 
2853         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2854         if (skb == NULL)
2855                 goto errout;
2856 
2857         type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
2858         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2859         if (nlh == NULL)
2860                 goto nlmsg_failure;
2861 
2862         nfmsg = nlmsg_data(nlh);
2863         nfmsg->nfgen_family = exp->tuple.src.l3num;
2864         nfmsg->version      = NFNETLINK_V0;
2865         nfmsg->res_id       = 0;
2866 
2867         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2868                 goto nla_put_failure;
2869 
2870         nlmsg_end(skb, nlh);
2871         nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2872         return 0;
2873 
2874 nla_put_failure:
2875         nlmsg_cancel(skb, nlh);
2876 nlmsg_failure:
2877         kfree_skb(skb);
2878 errout:
2879         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2880         return 0;
2881 }
2882 #endif
2883 static int ctnetlink_exp_done(struct netlink_callback *cb)
2884 {
2885         if (cb->args[1])
2886                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2887         return 0;
2888 }
2889 
2890 static int
2891 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2892 {
2893         struct net *net = sock_net(skb->sk);
2894         struct nf_conntrack_expect *exp, *last;
2895         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2896         u_int8_t l3proto = nfmsg->nfgen_family;
2897 
2898         rcu_read_lock();
2899         last = (struct nf_conntrack_expect *)cb->args[1];
2900         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2901 restart:
2902                 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
2903                                          hnode) {
2904                         if (l3proto && exp->tuple.src.l3num != l3proto)
2905                                 continue;
2906 
2907                         if (!net_eq(nf_ct_net(exp->master), net))
2908                                 continue;
2909 
2910                         if (cb->args[1]) {
2911                                 if (exp != last)
2912                                         continue;
2913                                 cb->args[1] = 0;
2914                         }
2915                         if (ctnetlink_exp_fill_info(skb,
2916                                                     NETLINK_CB(cb->skb).portid,
2917                                                     cb->nlh->nlmsg_seq,
2918                                                     IPCTNL_MSG_EXP_NEW,
2919                                                     exp) < 0) {
2920                                 if (!refcount_inc_not_zero(&exp->use))
2921                                         continue;
2922                                 cb->args[1] = (unsigned long)exp;
2923                                 goto out;
2924                         }
2925                 }
2926                 if (cb->args[1]) {
2927                         cb->args[1] = 0;
2928                         goto restart;
2929                 }
2930         }
2931 out:
2932         rcu_read_unlock();
2933         if (last)
2934                 nf_ct_expect_put(last);
2935 
2936         return skb->len;
2937 }
2938 
2939 static int
2940 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2941 {
2942         struct nf_conntrack_expect *exp, *last;
2943         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2944         struct nf_conn *ct = cb->data;
2945         struct nf_conn_help *help = nfct_help(ct);
2946         u_int8_t l3proto = nfmsg->nfgen_family;
2947 
2948         if (cb->args[0])
2949                 return 0;
2950 
2951         rcu_read_lock();
2952         last = (struct nf_conntrack_expect *)cb->args[1];
2953 restart:
2954         hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
2955                 if (l3proto && exp->tuple.src.l3num != l3proto)
2956                         continue;
2957                 if (cb->args[1]) {
2958                         if (exp != last)
2959                                 continue;
2960                         cb->args[1] = 0;
2961                 }
2962                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2963                                             cb->nlh->nlmsg_seq,
2964                                             IPCTNL_MSG_EXP_NEW,
2965                                             exp) < 0) {
2966                         if (!refcount_inc_not_zero(&exp->use))
2967                                 continue;
2968                         cb->args[1] = (unsigned long)exp;
2969                         goto out;
2970                 }
2971         }
2972         if (cb->args[1]) {
2973                 cb->args[1] = 0;
2974                 goto restart;
2975         }
2976         cb->args[0] = 1;
2977 out:
2978         rcu_read_unlock();
2979         if (last)
2980                 nf_ct_expect_put(last);
2981 
2982         return skb->len;
2983 }
2984 
2985 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2986                                  struct sk_buff *skb,
2987                                  const struct nlmsghdr *nlh,
2988                                  const struct nlattr * const cda[],
2989                                  struct netlink_ext_ack *extack)
2990 {
2991         int err;
2992         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2993         u_int8_t u3 = nfmsg->nfgen_family;
2994         struct nf_conntrack_tuple tuple;
2995         struct nf_conntrack_tuple_hash *h;
2996         struct nf_conn *ct;
2997         struct nf_conntrack_zone zone;
2998         struct netlink_dump_control c = {
2999                 .dump = ctnetlink_exp_ct_dump_table,
3000                 .done = ctnetlink_exp_done,
3001         };
3002 
3003         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3004                                     u3, NULL);
3005         if (err < 0)
3006                 return err;
3007 
3008         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3009         if (err < 0)
3010                 return err;
3011 
3012         h = nf_conntrack_find_get(net, &zone, &tuple);
3013         if (!h)
3014                 return -ENOENT;
3015 
3016         ct = nf_ct_tuplehash_to_ctrack(h);
3017         /* No expectation linked to this connection tracking. */
3018         if (!nfct_help(ct)) {
3019                 nf_ct_put(ct);
3020                 return 0;
3021         }
3022 
3023         c.data = ct;
3024 
3025         err = netlink_dump_start(ctnl, skb, nlh, &c);
3026         nf_ct_put(ct);
3027 
3028         return err;
3029 }
3030 
3031 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
3032                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3033                                 const struct nlattr * const cda[],
3034                                 struct netlink_ext_ack *extack)
3035 {
3036         struct nf_conntrack_tuple tuple;
3037         struct nf_conntrack_expect *exp;
3038         struct sk_buff *skb2;
3039         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3040         u_int8_t u3 = nfmsg->nfgen_family;
3041         struct nf_conntrack_zone zone;
3042         int err;
3043 
3044         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3045                 if (cda[CTA_EXPECT_MASTER])
3046                         return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
3047                                                      extack);
3048                 else {
3049                         struct netlink_dump_control c = {
3050                                 .dump = ctnetlink_exp_dump_table,
3051                                 .done = ctnetlink_exp_done,
3052                         };
3053                         return netlink_dump_start(ctnl, skb, nlh, &c);
3054                 }
3055         }
3056 
3057         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3058         if (err < 0)
3059                 return err;
3060 
3061         if (cda[CTA_EXPECT_TUPLE])
3062                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3063                                             u3, NULL);
3064         else if (cda[CTA_EXPECT_MASTER])
3065                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3066                                             u3, NULL);
3067         else
3068                 return -EINVAL;
3069 
3070         if (err < 0)
3071                 return err;
3072 
3073         exp = nf_ct_expect_find_get(net, &zone, &tuple);
3074         if (!exp)
3075                 return -ENOENT;
3076 
3077         if (cda[CTA_EXPECT_ID]) {
3078                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3079 
3080                 if (id != nf_expect_get_id(exp)) {
3081                         nf_ct_expect_put(exp);
3082                         return -ENOENT;
3083                 }
3084         }
3085 
3086         err = -ENOMEM;
3087         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3088         if (skb2 == NULL) {
3089                 nf_ct_expect_put(exp);
3090                 goto out;
3091         }
3092 
3093         rcu_read_lock();
3094         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3095                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
3096         rcu_read_unlock();
3097         nf_ct_expect_put(exp);
3098         if (err <= 0)
3099                 goto free;
3100 
3101         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
3102         if (err < 0)
3103                 goto out;
3104 
3105         return 0;
3106 
3107 free:
3108         kfree_skb(skb2);
3109 out:
3110         /* this avoids a loop in nfnetlink. */
3111         return err == -EAGAIN ? -ENOBUFS : err;
3112 }
3113 
3114 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3115 {
3116         const struct nf_conn_help *m_help;
3117         const char *name = data;
3118 
3119         m_help = nfct_help(exp->master);
3120 
3121         return strcmp(m_help->helper->name, name) == 0;
3122 }
3123 
3124 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3125 {
3126         return true;
3127 }
3128 
3129 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
3130                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3131                                 const struct nlattr * const cda[],
3132                                 struct netlink_ext_ack *extack)
3133 {
3134         struct nf_conntrack_expect *exp;
3135         struct nf_conntrack_tuple tuple;
3136         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3137         u_int8_t u3 = nfmsg->nfgen_family;
3138         struct nf_conntrack_zone zone;
3139         int err;
3140 
3141         if (cda[CTA_EXPECT_TUPLE]) {
3142                 /* delete a single expect by tuple */
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                 /* bump usage count to 2 */
3153                 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3154                 if (!exp)
3155                         return -ENOENT;
3156 
3157                 if (cda[CTA_EXPECT_ID]) {
3158                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3159                         if (ntohl(id) != (u32)(unsigned long)exp) {
3160                                 nf_ct_expect_put(exp);
3161                                 return -ENOENT;
3162                         }
3163                 }
3164 
3165                 /* after list removal, usage count == 1 */
3166                 spin_lock_bh(&nf_conntrack_expect_lock);
3167                 if (del_timer(&exp->timeout)) {
3168                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3169                                                    nlmsg_report(nlh));
3170                         nf_ct_expect_put(exp);
3171                 }
3172                 spin_unlock_bh(&nf_conntrack_expect_lock);
3173                 /* have to put what we 'get' above.
3174                  * after this line usage count == 0 */
3175                 nf_ct_expect_put(exp);
3176         } else if (cda[CTA_EXPECT_HELP_NAME]) {
3177                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3178 
3179                 nf_ct_expect_iterate_net(net, expect_iter_name, name,
3180                                          NETLINK_CB(skb).portid,
3181                                          nlmsg_report(nlh));
3182         } else {
3183                 /* This basically means we have to flush everything*/
3184                 nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
3185                                          NETLINK_CB(skb).portid,
3186                                          nlmsg_report(nlh));
3187         }
3188 
3189         return 0;
3190 }
3191 static int
3192 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3193                         const struct nlattr * const cda[])
3194 {
3195         if (cda[CTA_EXPECT_TIMEOUT]) {
3196                 if (!del_timer(&x->timeout))
3197                         return -ETIME;
3198 
3199                 x->timeout.expires = jiffies +
3200                         ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3201                 add_timer(&x->timeout);
3202         }
3203         return 0;
3204 }
3205 
3206 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3207         [CTA_EXPECT_NAT_DIR]    = { .type = NLA_U32 },
3208         [CTA_EXPECT_NAT_TUPLE]  = { .type = NLA_NESTED },
3209 };
3210 
3211 static int
3212 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3213                            struct nf_conntrack_expect *exp,
3214                            u_int8_t u3)
3215 {
3216 #if IS_ENABLED(CONFIG_NF_NAT)
3217         struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3218         struct nf_conntrack_tuple nat_tuple = {};
3219         int err;
3220 
3221         err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3222                                           exp_nat_nla_policy, NULL);
3223         if (err < 0)
3224                 return err;
3225 
3226         if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3227                 return -EINVAL;
3228 
3229         err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3230                                     &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3231                                     u3, NULL);
3232         if (err < 0)
3233                 return err;
3234 
3235         exp->saved_addr = nat_tuple.src.u3;
3236         exp->saved_proto = nat_tuple.src.u;
3237         exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3238 
3239         return 0;
3240 #else
3241         return -EOPNOTSUPP;
3242 #endif
3243 }
3244 
3245 static struct nf_conntrack_expect *
3246 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3247                        struct nf_conntrack_helper *helper,
3248                        struct nf_conntrack_tuple *tuple,
3249                        struct nf_conntrack_tuple *mask)
3250 {
3251         u_int32_t class = 0;
3252         struct nf_conntrack_expect *exp;
3253         struct nf_conn_help *help;
3254         int err;
3255 
3256         help = nfct_help(ct);
3257         if (!help)
3258                 return ERR_PTR(-EOPNOTSUPP);
3259 
3260         if (cda[CTA_EXPECT_CLASS] && helper) {
3261                 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3262                 if (class > helper->expect_class_max)
3263                         return ERR_PTR(-EINVAL);
3264         }
3265         exp = nf_ct_expect_alloc(ct);
3266         if (!exp)
3267                 return ERR_PTR(-ENOMEM);
3268 
3269         if (cda[CTA_EXPECT_FLAGS]) {
3270                 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3271                 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3272         } else {
3273                 exp->flags = 0;
3274         }
3275         if (cda[CTA_EXPECT_FN]) {
3276                 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3277                 struct nf_ct_helper_expectfn *expfn;
3278 
3279                 expfn = nf_ct_helper_expectfn_find_by_name(name);
3280                 if (expfn == NULL) {
3281                         err = -EINVAL;
3282                         goto err_out;
3283                 }
3284                 exp->expectfn = expfn->expectfn;
3285         } else
3286                 exp->expectfn = NULL;
3287 
3288         exp->class = class;
3289         exp->master = ct;
3290         exp->helper = helper;
3291         exp->tuple = *tuple;
3292         exp->mask.src.u3 = mask->src.u3;
3293         exp->mask.src.u.all = mask->src.u.all;
3294 
3295         if (cda[CTA_EXPECT_NAT]) {
3296                 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3297                                                  exp, nf_ct_l3num(ct));
3298                 if (err < 0)
3299                         goto err_out;
3300         }
3301         return exp;
3302 err_out:
3303         nf_ct_expect_put(exp);
3304         return ERR_PTR(err);
3305 }
3306 
3307 static int
3308 ctnetlink_create_expect(struct net *net,
3309                         const struct nf_conntrack_zone *zone,
3310                         const struct nlattr * const cda[],
3311                         u_int8_t u3, u32 portid, int report)
3312 {
3313         struct nf_conntrack_tuple tuple, mask, master_tuple;
3314         struct nf_conntrack_tuple_hash *h = NULL;
3315         struct nf_conntrack_helper *helper = NULL;
3316         struct nf_conntrack_expect *exp;
3317         struct nf_conn *ct;
3318         int err;
3319 
3320         /* caller guarantees that those three CTA_EXPECT_* exist */
3321         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3322                                     u3, NULL);
3323         if (err < 0)
3324                 return err;
3325         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3326                                     u3, NULL);
3327         if (err < 0)
3328                 return err;
3329         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3330                                     u3, NULL);
3331         if (err < 0)
3332                 return err;
3333 
3334         /* Look for master conntrack of this expectation */
3335         h = nf_conntrack_find_get(net, zone, &master_tuple);
3336         if (!h)
3337                 return -ENOENT;
3338         ct = nf_ct_tuplehash_to_ctrack(h);
3339 
3340         rcu_read_lock();
3341         if (cda[CTA_EXPECT_HELP_NAME]) {
3342                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3343 
3344                 helper = __nf_conntrack_helper_find(helpname, u3,
3345                                                     nf_ct_protonum(ct));
3346                 if (helper == NULL) {
3347                         rcu_read_unlock();
3348 #ifdef CONFIG_MODULES
3349                         if (request_module("nfct-helper-%s", helpname) < 0) {
3350                                 err = -EOPNOTSUPP;
3351                                 goto err_ct;
3352                         }
3353                         rcu_read_lock();
3354                         helper = __nf_conntrack_helper_find(helpname, u3,
3355                                                             nf_ct_protonum(ct));
3356                         if (helper) {
3357                                 err = -EAGAIN;
3358                                 goto err_rcu;
3359                         }
3360                         rcu_read_unlock();
3361 #endif
3362                         err = -EOPNOTSUPP;
3363                         goto err_ct;
3364                 }
3365         }
3366 
3367         exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3368         if (IS_ERR(exp)) {
3369                 err = PTR_ERR(exp);
3370                 goto err_rcu;
3371         }
3372 
3373         err = nf_ct_expect_related_report(exp, portid, report, 0);
3374         nf_ct_expect_put(exp);
3375 err_rcu:
3376         rcu_read_unlock();
3377 err_ct:
3378         nf_ct_put(ct);
3379         return err;
3380 }
3381 
3382 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3383                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3384                                 const struct nlattr * const cda[],
3385                                 struct netlink_ext_ack *extack)
3386 {
3387         struct nf_conntrack_tuple tuple;
3388         struct nf_conntrack_expect *exp;
3389         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3390         u_int8_t u3 = nfmsg->nfgen_family;
3391         struct nf_conntrack_zone zone;
3392         int err;
3393 
3394         if (!cda[CTA_EXPECT_TUPLE]
3395             || !cda[CTA_EXPECT_MASK]
3396             || !cda[CTA_EXPECT_MASTER])
3397                 return -EINVAL;
3398 
3399         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3400         if (err < 0)
3401                 return err;
3402 
3403         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3404                                     u3, NULL);
3405         if (err < 0)
3406                 return err;
3407 
3408         spin_lock_bh(&nf_conntrack_expect_lock);
3409         exp = __nf_ct_expect_find(net, &zone, &tuple);
3410         if (!exp) {
3411                 spin_unlock_bh(&nf_conntrack_expect_lock);
3412                 err = -ENOENT;
3413                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3414                         err = ctnetlink_create_expect(net, &zone, cda, u3,
3415                                                       NETLINK_CB(skb).portid,
3416                                                       nlmsg_report(nlh));
3417                 }
3418                 return err;
3419         }
3420 
3421         err = -EEXIST;
3422         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3423                 err = ctnetlink_change_expect(exp, cda);
3424         spin_unlock_bh(&nf_conntrack_expect_lock);
3425 
3426         return err;
3427 }
3428 
3429 static int
3430 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3431                              const struct ip_conntrack_stat *st)
3432 {
3433         struct nlmsghdr *nlh;
3434         struct nfgenmsg *nfmsg;
3435         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3436 
3437         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3438                               IPCTNL_MSG_EXP_GET_STATS_CPU);
3439         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3440         if (nlh == NULL)
3441                 goto nlmsg_failure;
3442 
3443         nfmsg = nlmsg_data(nlh);
3444         nfmsg->nfgen_family = AF_UNSPEC;
3445         nfmsg->version      = NFNETLINK_V0;
3446         nfmsg->res_id       = htons(cpu);
3447 
3448         if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3449             nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3450             nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3451                 goto nla_put_failure;
3452 
3453         nlmsg_end(skb, nlh);
3454         return skb->len;
3455 
3456 nla_put_failure:
3457 nlmsg_failure:
3458         nlmsg_cancel(skb, nlh);
3459         return -1;
3460 }
3461 
3462 static int
3463 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3464 {
3465         int cpu;
3466         struct net *net = sock_net(skb->sk);
3467 
3468         if (cb->args[0] == nr_cpu_ids)
3469                 return 0;
3470 
3471         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3472                 const struct ip_conntrack_stat *st;
3473 
3474                 if (!cpu_possible(cpu))
3475                         continue;
3476 
3477                 st = per_cpu_ptr(net->ct.stat, cpu);
3478                 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3479                                                  cb->nlh->nlmsg_seq,
3480                                                  cpu, st) < 0)
3481                         break;
3482         }
3483         cb->args[0] = cpu;
3484 
3485         return skb->len;
3486 }
3487 
3488 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3489                                   struct sk_buff *skb,
3490                                   const struct nlmsghdr *nlh,
3491                                   const struct nlattr * const cda[],
3492                                   struct netlink_ext_ack *extack)
3493 {
3494         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3495                 struct netlink_dump_control c = {
3496                         .dump = ctnetlink_exp_stat_cpu_dump,
3497                 };
3498                 return netlink_dump_start(ctnl, skb, nlh, &c);
3499         }
3500 
3501         return 0;
3502 }
3503 
3504 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3505 static struct nf_ct_event_notifier ctnl_notifier = {
3506         .fcn = ctnetlink_conntrack_event,
3507 };
3508 
3509 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3510         .fcn = ctnetlink_expect_event,
3511 };
3512 #endif
3513 
3514 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3515         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
3516                                             .attr_count = CTA_MAX,
3517                                             .policy = ct_nla_policy },
3518         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
3519                                             .attr_count = CTA_MAX,
3520                                             .policy = ct_nla_policy },
3521         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
3522                                             .attr_count = CTA_MAX,
3523                                             .policy = ct_nla_policy },
3524         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
3525                                             .attr_count = CTA_MAX,
3526                                             .policy = ct_nla_policy },
3527         [IPCTNL_MSG_CT_GET_STATS_CPU]   = { .call = ctnetlink_stat_ct_cpu },
3528         [IPCTNL_MSG_CT_GET_STATS]       = { .call = ctnetlink_stat_ct },
3529         [IPCTNL_MSG_CT_GET_DYING]       = { .call = ctnetlink_get_ct_dying },
3530         [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3531 };
3532 
3533 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3534         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
3535                                             .attr_count = CTA_EXPECT_MAX,
3536                                             .policy = exp_nla_policy },
3537         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
3538                                             .attr_count = CTA_EXPECT_MAX,
3539                                             .policy = exp_nla_policy },
3540         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
3541                                             .attr_count = CTA_EXPECT_MAX,
3542                                             .policy = exp_nla_policy },
3543         [IPCTNL_MSG_EXP_GET_STATS_CPU]  = { .call = ctnetlink_stat_exp_cpu },
3544 };
3545 
3546 static const struct nfnetlink_subsystem ctnl_subsys = {
3547         .name                           = "conntrack",
3548         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
3549         .cb_count                       = IPCTNL_MSG_MAX,
3550         .cb                             = ctnl_cb,
3551 };
3552 
3553 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3554         .name                           = "conntrack_expect",
3555         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
3556         .cb_count                       = IPCTNL_MSG_EXP_MAX,
3557         .cb                             = ctnl_exp_cb,
3558 };
3559 
3560 MODULE_ALIAS("ip_conntrack_netlink");
3561 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3562 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3563 
3564 static int __net_init ctnetlink_net_init(struct net *net)
3565 {
3566 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3567         int ret;
3568 
3569         ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3570         if (ret < 0) {
3571                 pr_err("ctnetlink_init: cannot register notifier.\n");
3572                 goto err_out;
3573         }
3574 
3575         ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3576         if (ret < 0) {
3577                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3578                 goto err_unreg_notifier;
3579         }
3580 #endif
3581         return 0;
3582 
3583 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3584 err_unreg_notifier:
3585         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3586 err_out:
3587         return ret;
3588 #endif
3589 }
3590 
3591 static void ctnetlink_net_exit(struct net *net)
3592 {
3593 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3594         nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3595         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3596 #endif
3597 }
3598 
3599 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3600 {
3601         struct net *net;
3602 
3603         list_for_each_entry(net, net_exit_list, exit_list)
3604                 ctnetlink_net_exit(net);
3605 }
3606 
3607 static struct pernet_operations ctnetlink_net_ops = {
3608         .init           = ctnetlink_net_init,
3609         .exit_batch     = ctnetlink_net_exit_batch,
3610 };
3611 
3612 static int __init ctnetlink_init(void)
3613 {
3614         int ret;
3615 
3616         ret = nfnetlink_subsys_register(&ctnl_subsys);
3617         if (ret < 0) {
3618                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3619                 goto err_out;
3620         }
3621 
3622         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3623         if (ret < 0) {
3624                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3625                 goto err_unreg_subsys;
3626         }
3627 
3628         ret = register_pernet_subsys(&ctnetlink_net_ops);
3629         if (ret < 0) {
3630                 pr_err("ctnetlink_init: cannot register pernet operations\n");
3631                 goto err_unreg_exp_subsys;
3632         }
3633 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3634         /* setup interaction between nf_queue and nf_conntrack_netlink. */
3635         RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3636 #endif
3637         return 0;
3638 
3639 err_unreg_exp_subsys:
3640         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3641 err_unreg_subsys:
3642         nfnetlink_subsys_unregister(&ctnl_subsys);
3643 err_out:
3644         return ret;
3645 }
3646 
3647 static void __exit ctnetlink_exit(void)
3648 {
3649         unregister_pernet_subsys(&ctnetlink_net_ops);
3650         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3651         nfnetlink_subsys_unregister(&ctnl_subsys);
3652 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3653         RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3654 #endif
3655         synchronize_rcu();
3656 }
3657 
3658 module_init(ctnetlink_init);
3659 module_exit(ctnetlink_exit);
3660 

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