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Linux/net/netfilter/nf_conntrack_standalone.c

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  1 /* (C) 1999-2001 Paul `Rusty' Russell
  2  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
  3  * (C) 2005-2012 Patrick McHardy <kaber@trash.net>
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  */
  9 
 10 #include <linux/types.h>
 11 #include <linux/netfilter.h>
 12 #include <linux/slab.h>
 13 #include <linux/module.h>
 14 #include <linux/skbuff.h>
 15 #include <linux/proc_fs.h>
 16 #include <linux/seq_file.h>
 17 #include <linux/percpu.h>
 18 #include <linux/netdevice.h>
 19 #include <linux/security.h>
 20 #include <net/net_namespace.h>
 21 #ifdef CONFIG_SYSCTL
 22 #include <linux/sysctl.h>
 23 #endif
 24 
 25 #include <net/netfilter/nf_conntrack.h>
 26 #include <net/netfilter/nf_conntrack_core.h>
 27 #include <net/netfilter/nf_conntrack_l3proto.h>
 28 #include <net/netfilter/nf_conntrack_l4proto.h>
 29 #include <net/netfilter/nf_conntrack_expect.h>
 30 #include <net/netfilter/nf_conntrack_helper.h>
 31 #include <net/netfilter/nf_conntrack_acct.h>
 32 #include <net/netfilter/nf_conntrack_zones.h>
 33 #include <net/netfilter/nf_conntrack_timestamp.h>
 34 #include <linux/rculist_nulls.h>
 35 
 36 MODULE_LICENSE("GPL");
 37 
 38 #ifdef CONFIG_NF_CONNTRACK_PROCFS
 39 void
 40 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
 41             const struct nf_conntrack_l3proto *l3proto,
 42             const struct nf_conntrack_l4proto *l4proto)
 43 {
 44         switch (l3proto->l3proto) {
 45         case NFPROTO_IPV4:
 46                 seq_printf(s, "src=%pI4 dst=%pI4 ",
 47                            &tuple->src.u3.ip, &tuple->dst.u3.ip);
 48                 break;
 49         case NFPROTO_IPV6:
 50                 seq_printf(s, "src=%pI6 dst=%pI6 ",
 51                            tuple->src.u3.ip6, tuple->dst.u3.ip6);
 52                 break;
 53         default:
 54                 break;
 55         }
 56 
 57         switch (l4proto->l4proto) {
 58         case IPPROTO_ICMP:
 59                 seq_printf(s, "type=%u code=%u id=%u ",
 60                            tuple->dst.u.icmp.type,
 61                            tuple->dst.u.icmp.code,
 62                            ntohs(tuple->src.u.icmp.id));
 63                 break;
 64         case IPPROTO_TCP:
 65                 seq_printf(s, "sport=%hu dport=%hu ",
 66                            ntohs(tuple->src.u.tcp.port),
 67                            ntohs(tuple->dst.u.tcp.port));
 68                 break;
 69         case IPPROTO_UDPLITE: /* fallthrough */
 70         case IPPROTO_UDP:
 71                 seq_printf(s, "sport=%hu dport=%hu ",
 72                            ntohs(tuple->src.u.udp.port),
 73                            ntohs(tuple->dst.u.udp.port));
 74 
 75                 break;
 76         case IPPROTO_DCCP:
 77                 seq_printf(s, "sport=%hu dport=%hu ",
 78                            ntohs(tuple->src.u.dccp.port),
 79                            ntohs(tuple->dst.u.dccp.port));
 80                 break;
 81         case IPPROTO_SCTP:
 82                 seq_printf(s, "sport=%hu dport=%hu ",
 83                            ntohs(tuple->src.u.sctp.port),
 84                            ntohs(tuple->dst.u.sctp.port));
 85                 break;
 86         case IPPROTO_ICMPV6:
 87                 seq_printf(s, "type=%u code=%u id=%u ",
 88                            tuple->dst.u.icmp.type,
 89                            tuple->dst.u.icmp.code,
 90                            ntohs(tuple->src.u.icmp.id));
 91                 break;
 92         case IPPROTO_GRE:
 93                 seq_printf(s, "srckey=0x%x dstkey=0x%x ",
 94                            ntohs(tuple->src.u.gre.key),
 95                            ntohs(tuple->dst.u.gre.key));
 96                 break;
 97         default:
 98                 break;
 99         }
100 }
101 EXPORT_SYMBOL_GPL(print_tuple);
102 
103 struct ct_iter_state {
104         struct seq_net_private p;
105         struct hlist_nulls_head *hash;
106         unsigned int htable_size;
107         unsigned int bucket;
108         u_int64_t time_now;
109 };
110 
111 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
112 {
113         struct ct_iter_state *st = seq->private;
114         struct hlist_nulls_node *n;
115 
116         for (st->bucket = 0;
117              st->bucket < st->htable_size;
118              st->bucket++) {
119                 n = rcu_dereference(
120                         hlist_nulls_first_rcu(&st->hash[st->bucket]));
121                 if (!is_a_nulls(n))
122                         return n;
123         }
124         return NULL;
125 }
126 
127 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
128                                       struct hlist_nulls_node *head)
129 {
130         struct ct_iter_state *st = seq->private;
131 
132         head = rcu_dereference(hlist_nulls_next_rcu(head));
133         while (is_a_nulls(head)) {
134                 if (likely(get_nulls_value(head) == st->bucket)) {
135                         if (++st->bucket >= st->htable_size)
136                                 return NULL;
137                 }
138                 head = rcu_dereference(
139                         hlist_nulls_first_rcu(&st->hash[st->bucket]));
140         }
141         return head;
142 }
143 
144 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
145 {
146         struct hlist_nulls_node *head = ct_get_first(seq);
147 
148         if (head)
149                 while (pos && (head = ct_get_next(seq, head)))
150                         pos--;
151         return pos ? NULL : head;
152 }
153 
154 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
155         __acquires(RCU)
156 {
157         struct ct_iter_state *st = seq->private;
158 
159         st->time_now = ktime_get_real_ns();
160         rcu_read_lock();
161 
162         nf_conntrack_get_ht(&st->hash, &st->htable_size);
163         return ct_get_idx(seq, *pos);
164 }
165 
166 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
167 {
168         (*pos)++;
169         return ct_get_next(s, v);
170 }
171 
172 static void ct_seq_stop(struct seq_file *s, void *v)
173         __releases(RCU)
174 {
175         rcu_read_unlock();
176 }
177 
178 #ifdef CONFIG_NF_CONNTRACK_SECMARK
179 static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
180 {
181         int ret;
182         u32 len;
183         char *secctx;
184 
185         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
186         if (ret)
187                 return;
188 
189         seq_printf(s, "secctx=%s ", secctx);
190 
191         security_release_secctx(secctx, len);
192 }
193 #else
194 static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
195 {
196 }
197 #endif
198 
199 #ifdef CONFIG_NF_CONNTRACK_ZONES
200 static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
201                          int dir)
202 {
203         const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
204 
205         if (zone->dir != dir)
206                 return;
207         switch (zone->dir) {
208         case NF_CT_DEFAULT_ZONE_DIR:
209                 seq_printf(s, "zone=%u ", zone->id);
210                 break;
211         case NF_CT_ZONE_DIR_ORIG:
212                 seq_printf(s, "zone-orig=%u ", zone->id);
213                 break;
214         case NF_CT_ZONE_DIR_REPL:
215                 seq_printf(s, "zone-reply=%u ", zone->id);
216                 break;
217         default:
218                 break;
219         }
220 }
221 #else
222 static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
223                                 int dir)
224 {
225 }
226 #endif
227 
228 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
229 static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
230 {
231         struct ct_iter_state *st = s->private;
232         struct nf_conn_tstamp *tstamp;
233         s64 delta_time;
234 
235         tstamp = nf_conn_tstamp_find(ct);
236         if (tstamp) {
237                 delta_time = st->time_now - tstamp->start;
238                 if (delta_time > 0)
239                         delta_time = div_s64(delta_time, NSEC_PER_SEC);
240                 else
241                         delta_time = 0;
242 
243                 seq_printf(s, "delta-time=%llu ",
244                            (unsigned long long)delta_time);
245         }
246         return;
247 }
248 #else
249 static inline void
250 ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
251 {
252 }
253 #endif
254 
255 static const char* l3proto_name(u16 proto)
256 {
257         switch (proto) {
258         case AF_INET: return "ipv4";
259         case AF_INET6: return "ipv6";
260         }
261 
262         return "unknown";
263 }
264 
265 static const char* l4proto_name(u16 proto)
266 {
267         switch (proto) {
268         case IPPROTO_ICMP: return "icmp";
269         case IPPROTO_TCP: return "tcp";
270         case IPPROTO_UDP: return "udp";
271         case IPPROTO_DCCP: return "dccp";
272         case IPPROTO_GRE: return "gre";
273         case IPPROTO_SCTP: return "sctp";
274         case IPPROTO_UDPLITE: return "udplite";
275         }
276 
277         return "unknown";
278 }
279 
280 /* return 0 on success, 1 in case of error */
281 static int ct_seq_show(struct seq_file *s, void *v)
282 {
283         struct nf_conntrack_tuple_hash *hash = v;
284         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
285         const struct nf_conntrack_l3proto *l3proto;
286         const struct nf_conntrack_l4proto *l4proto;
287         struct net *net = seq_file_net(s);
288         int ret = 0;
289 
290         WARN_ON(!ct);
291         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
292                 return 0;
293 
294         if (nf_ct_should_gc(ct)) {
295                 nf_ct_kill(ct);
296                 goto release;
297         }
298 
299         /* we only want to print DIR_ORIGINAL */
300         if (NF_CT_DIRECTION(hash))
301                 goto release;
302 
303         if (!net_eq(nf_ct_net(ct), net))
304                 goto release;
305 
306         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
307         WARN_ON(!l3proto);
308         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
309         WARN_ON(!l4proto);
310 
311         ret = -ENOSPC;
312         seq_printf(s, "%-8s %u %-8s %u ",
313                    l3proto_name(l3proto->l3proto), nf_ct_l3num(ct),
314                    l4proto_name(l4proto->l4proto), nf_ct_protonum(ct));
315 
316         if (!test_bit(IPS_OFFLOAD_BIT, &ct->status))
317                 seq_printf(s, "%ld ", nf_ct_expires(ct)  / HZ);
318 
319         if (l4proto->print_conntrack)
320                 l4proto->print_conntrack(s, ct);
321 
322         print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
323                     l3proto, l4proto);
324 
325         ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
326 
327         if (seq_has_overflowed(s))
328                 goto release;
329 
330         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
331                 goto release;
332 
333         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
334                 seq_puts(s, "[UNREPLIED] ");
335 
336         print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
337                     l3proto, l4proto);
338 
339         ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
340 
341         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
342                 goto release;
343 
344         if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
345                 seq_puts(s, "[OFFLOAD] ");
346         else if (test_bit(IPS_ASSURED_BIT, &ct->status))
347                 seq_puts(s, "[ASSURED] ");
348 
349         if (seq_has_overflowed(s))
350                 goto release;
351 
352 #if defined(CONFIG_NF_CONNTRACK_MARK)
353         seq_printf(s, "mark=%u ", ct->mark);
354 #endif
355 
356         ct_show_secctx(s, ct);
357         ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
358         ct_show_delta_time(s, ct);
359 
360         seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
361 
362         if (seq_has_overflowed(s))
363                 goto release;
364 
365         ret = 0;
366 release:
367         nf_ct_put(ct);
368         return ret;
369 }
370 
371 static const struct seq_operations ct_seq_ops = {
372         .start = ct_seq_start,
373         .next  = ct_seq_next,
374         .stop  = ct_seq_stop,
375         .show  = ct_seq_show
376 };
377 
378 static int ct_open(struct inode *inode, struct file *file)
379 {
380         return seq_open_net(inode, file, &ct_seq_ops,
381                         sizeof(struct ct_iter_state));
382 }
383 
384 static const struct file_operations ct_file_ops = {
385         .open    = ct_open,
386         .read    = seq_read,
387         .llseek  = seq_lseek,
388         .release = seq_release_net,
389 };
390 
391 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
392 {
393         struct net *net = seq_file_net(seq);
394         int cpu;
395 
396         if (*pos == 0)
397                 return SEQ_START_TOKEN;
398 
399         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
400                 if (!cpu_possible(cpu))
401                         continue;
402                 *pos = cpu + 1;
403                 return per_cpu_ptr(net->ct.stat, cpu);
404         }
405 
406         return NULL;
407 }
408 
409 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
410 {
411         struct net *net = seq_file_net(seq);
412         int cpu;
413 
414         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
415                 if (!cpu_possible(cpu))
416                         continue;
417                 *pos = cpu + 1;
418                 return per_cpu_ptr(net->ct.stat, cpu);
419         }
420 
421         return NULL;
422 }
423 
424 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
425 {
426 }
427 
428 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
429 {
430         struct net *net = seq_file_net(seq);
431         unsigned int nr_conntracks = atomic_read(&net->ct.count);
432         const struct ip_conntrack_stat *st = v;
433 
434         if (v == SEQ_START_TOKEN) {
435                 seq_puts(seq, "entries  searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error  expect_new expect_create expect_delete search_restart\n");
436                 return 0;
437         }
438 
439         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
440                         "%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
441                    nr_conntracks,
442                    0,
443                    st->found,
444                    0,
445                    st->invalid,
446                    st->ignore,
447                    0,
448                    0,
449                    st->insert,
450                    st->insert_failed,
451                    st->drop,
452                    st->early_drop,
453                    st->error,
454 
455                    st->expect_new,
456                    st->expect_create,
457                    st->expect_delete,
458                    st->search_restart
459                 );
460         return 0;
461 }
462 
463 static const struct seq_operations ct_cpu_seq_ops = {
464         .start  = ct_cpu_seq_start,
465         .next   = ct_cpu_seq_next,
466         .stop   = ct_cpu_seq_stop,
467         .show   = ct_cpu_seq_show,
468 };
469 
470 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
471 {
472         return seq_open_net(inode, file, &ct_cpu_seq_ops,
473                             sizeof(struct seq_net_private));
474 }
475 
476 static const struct file_operations ct_cpu_seq_fops = {
477         .open    = ct_cpu_seq_open,
478         .read    = seq_read,
479         .llseek  = seq_lseek,
480         .release = seq_release_net,
481 };
482 
483 static int nf_conntrack_standalone_init_proc(struct net *net)
484 {
485         struct proc_dir_entry *pde;
486         kuid_t root_uid;
487         kgid_t root_gid;
488 
489         pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops);
490         if (!pde)
491                 goto out_nf_conntrack;
492 
493         root_uid = make_kuid(net->user_ns, 0);
494         root_gid = make_kgid(net->user_ns, 0);
495         if (uid_valid(root_uid) && gid_valid(root_gid))
496                 proc_set_user(pde, root_uid, root_gid);
497 
498         pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
499                           &ct_cpu_seq_fops);
500         if (!pde)
501                 goto out_stat_nf_conntrack;
502         return 0;
503 
504 out_stat_nf_conntrack:
505         remove_proc_entry("nf_conntrack", net->proc_net);
506 out_nf_conntrack:
507         return -ENOMEM;
508 }
509 
510 static void nf_conntrack_standalone_fini_proc(struct net *net)
511 {
512         remove_proc_entry("nf_conntrack", net->proc_net_stat);
513         remove_proc_entry("nf_conntrack", net->proc_net);
514 }
515 #else
516 static int nf_conntrack_standalone_init_proc(struct net *net)
517 {
518         return 0;
519 }
520 
521 static void nf_conntrack_standalone_fini_proc(struct net *net)
522 {
523 }
524 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
525 
526 /* Sysctl support */
527 
528 #ifdef CONFIG_SYSCTL
529 /* Log invalid packets of a given protocol */
530 static int log_invalid_proto_min __read_mostly;
531 static int log_invalid_proto_max __read_mostly = 255;
532 
533 /* size the user *wants to set */
534 static unsigned int nf_conntrack_htable_size_user __read_mostly;
535 
536 static int
537 nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
538                          void __user *buffer, size_t *lenp, loff_t *ppos)
539 {
540         int ret;
541 
542         ret = proc_dointvec(table, write, buffer, lenp, ppos);
543         if (ret < 0 || !write)
544                 return ret;
545 
546         /* update ret, we might not be able to satisfy request */
547         ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
548 
549         /* update it to the actual value used by conntrack */
550         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
551         return ret;
552 }
553 
554 static struct ctl_table_header *nf_ct_netfilter_header;
555 
556 static struct ctl_table nf_ct_sysctl_table[] = {
557         {
558                 .procname       = "nf_conntrack_max",
559                 .data           = &nf_conntrack_max,
560                 .maxlen         = sizeof(int),
561                 .mode           = 0644,
562                 .proc_handler   = proc_dointvec,
563         },
564         {
565                 .procname       = "nf_conntrack_count",
566                 .data           = &init_net.ct.count,
567                 .maxlen         = sizeof(int),
568                 .mode           = 0444,
569                 .proc_handler   = proc_dointvec,
570         },
571         {
572                 .procname       = "nf_conntrack_buckets",
573                 .data           = &nf_conntrack_htable_size_user,
574                 .maxlen         = sizeof(unsigned int),
575                 .mode           = 0644,
576                 .proc_handler   = nf_conntrack_hash_sysctl,
577         },
578         {
579                 .procname       = "nf_conntrack_checksum",
580                 .data           = &init_net.ct.sysctl_checksum,
581                 .maxlen         = sizeof(unsigned int),
582                 .mode           = 0644,
583                 .proc_handler   = proc_dointvec,
584         },
585         {
586                 .procname       = "nf_conntrack_log_invalid",
587                 .data           = &init_net.ct.sysctl_log_invalid,
588                 .maxlen         = sizeof(unsigned int),
589                 .mode           = 0644,
590                 .proc_handler   = proc_dointvec_minmax,
591                 .extra1         = &log_invalid_proto_min,
592                 .extra2         = &log_invalid_proto_max,
593         },
594         {
595                 .procname       = "nf_conntrack_expect_max",
596                 .data           = &nf_ct_expect_max,
597                 .maxlen         = sizeof(int),
598                 .mode           = 0644,
599                 .proc_handler   = proc_dointvec,
600         },
601         { }
602 };
603 
604 static struct ctl_table nf_ct_netfilter_table[] = {
605         {
606                 .procname       = "nf_conntrack_max",
607                 .data           = &nf_conntrack_max,
608                 .maxlen         = sizeof(int),
609                 .mode           = 0644,
610                 .proc_handler   = proc_dointvec,
611         },
612         { }
613 };
614 
615 static int nf_conntrack_standalone_init_sysctl(struct net *net)
616 {
617         struct ctl_table *table;
618 
619         table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
620                         GFP_KERNEL);
621         if (!table)
622                 goto out_kmemdup;
623 
624         table[1].data = &net->ct.count;
625         table[3].data = &net->ct.sysctl_checksum;
626         table[4].data = &net->ct.sysctl_log_invalid;
627 
628         /* Don't export sysctls to unprivileged users */
629         if (net->user_ns != &init_user_ns)
630                 table[0].procname = NULL;
631 
632         if (!net_eq(&init_net, net))
633                 table[2].mode = 0444;
634 
635         net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
636         if (!net->ct.sysctl_header)
637                 goto out_unregister_netfilter;
638 
639         return 0;
640 
641 out_unregister_netfilter:
642         kfree(table);
643 out_kmemdup:
644         return -ENOMEM;
645 }
646 
647 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
648 {
649         struct ctl_table *table;
650 
651         table = net->ct.sysctl_header->ctl_table_arg;
652         unregister_net_sysctl_table(net->ct.sysctl_header);
653         kfree(table);
654 }
655 #else
656 static int nf_conntrack_standalone_init_sysctl(struct net *net)
657 {
658         return 0;
659 }
660 
661 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
662 {
663 }
664 #endif /* CONFIG_SYSCTL */
665 
666 static int nf_conntrack_pernet_init(struct net *net)
667 {
668         int ret;
669 
670         ret = nf_conntrack_init_net(net);
671         if (ret < 0)
672                 goto out_init;
673 
674         ret = nf_conntrack_standalone_init_proc(net);
675         if (ret < 0)
676                 goto out_proc;
677 
678         net->ct.sysctl_checksum = 1;
679         net->ct.sysctl_log_invalid = 0;
680         ret = nf_conntrack_standalone_init_sysctl(net);
681         if (ret < 0)
682                 goto out_sysctl;
683 
684         return 0;
685 
686 out_sysctl:
687         nf_conntrack_standalone_fini_proc(net);
688 out_proc:
689         nf_conntrack_cleanup_net(net);
690 out_init:
691         return ret;
692 }
693 
694 static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
695 {
696         struct net *net;
697 
698         list_for_each_entry(net, net_exit_list, exit_list) {
699                 nf_conntrack_standalone_fini_sysctl(net);
700                 nf_conntrack_standalone_fini_proc(net);
701         }
702         nf_conntrack_cleanup_net_list(net_exit_list);
703 }
704 
705 static struct pernet_operations nf_conntrack_net_ops = {
706         .init           = nf_conntrack_pernet_init,
707         .exit_batch     = nf_conntrack_pernet_exit,
708 };
709 
710 static int __init nf_conntrack_standalone_init(void)
711 {
712         int ret = nf_conntrack_init_start();
713         if (ret < 0)
714                 goto out_start;
715 
716         BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
717         BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
718 
719 #ifdef CONFIG_SYSCTL
720         nf_ct_netfilter_header =
721                 register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
722         if (!nf_ct_netfilter_header) {
723                 pr_err("nf_conntrack: can't register to sysctl.\n");
724                 ret = -ENOMEM;
725                 goto out_sysctl;
726         }
727 
728         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
729 #endif
730 
731         ret = register_pernet_subsys(&nf_conntrack_net_ops);
732         if (ret < 0)
733                 goto out_pernet;
734 
735         nf_conntrack_init_end();
736         return 0;
737 
738 out_pernet:
739 #ifdef CONFIG_SYSCTL
740         unregister_net_sysctl_table(nf_ct_netfilter_header);
741 out_sysctl:
742 #endif
743         nf_conntrack_cleanup_end();
744 out_start:
745         return ret;
746 }
747 
748 static void __exit nf_conntrack_standalone_fini(void)
749 {
750         nf_conntrack_cleanup_start();
751         unregister_pernet_subsys(&nf_conntrack_net_ops);
752 #ifdef CONFIG_SYSCTL
753         unregister_net_sysctl_table(nf_ct_netfilter_header);
754 #endif
755         nf_conntrack_cleanup_end();
756 }
757 
758 module_init(nf_conntrack_standalone_init);
759 module_exit(nf_conntrack_standalone_fini);
760 
761 /* Some modules need us, but don't depend directly on any symbol.
762    They should call this. */
763 void need_conntrack(void)
764 {
765 }
766 EXPORT_SYMBOL_GPL(need_conntrack);
767 

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