| 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 | l3proto->print_tuple(s, tuple); |
| 45 | l4proto->print_tuple(s, tuple); |
| 46 | } |
| 47 | EXPORT_SYMBOL_GPL(print_tuple); |
| 48 | |
| 49 | struct ct_iter_state { |
| 50 | struct seq_net_private p; |
| 51 | struct hlist_nulls_head *hash; |
| 52 | unsigned int htable_size; |
| 53 | unsigned int bucket; |
| 54 | u_int64_t time_now; |
| 55 | }; |
| 56 | |
| 57 | static struct hlist_nulls_node *ct_get_first(struct seq_file *seq) |
| 58 | { |
| 59 | struct ct_iter_state *st = seq->private; |
| 60 | struct hlist_nulls_node *n; |
| 61 | |
| 62 | for (st->bucket = 0; |
| 63 | st->bucket < st->htable_size; |
| 64 | st->bucket++) { |
| 65 | n = rcu_dereference( |
| 66 | hlist_nulls_first_rcu(&st->hash[st->bucket])); |
| 67 | if (!is_a_nulls(n)) |
| 68 | return n; |
| 69 | } |
| 70 | return NULL; |
| 71 | } |
| 72 | |
| 73 | static struct hlist_nulls_node *ct_get_next(struct seq_file *seq, |
| 74 | struct hlist_nulls_node *head) |
| 75 | { |
| 76 | struct ct_iter_state *st = seq->private; |
| 77 | |
| 78 | head = rcu_dereference(hlist_nulls_next_rcu(head)); |
| 79 | while (is_a_nulls(head)) { |
| 80 | if (likely(get_nulls_value(head) == st->bucket)) { |
| 81 | if (++st->bucket >= st->htable_size) |
| 82 | return NULL; |
| 83 | } |
| 84 | head = rcu_dereference( |
| 85 | hlist_nulls_first_rcu(&st->hash[st->bucket])); |
| 86 | } |
| 87 | return head; |
| 88 | } |
| 89 | |
| 90 | static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos) |
| 91 | { |
| 92 | struct hlist_nulls_node *head = ct_get_first(seq); |
| 93 | |
| 94 | if (head) |
| 95 | while (pos && (head = ct_get_next(seq, head))) |
| 96 | pos--; |
| 97 | return pos ? NULL : head; |
| 98 | } |
| 99 | |
| 100 | static void *ct_seq_start(struct seq_file *seq, loff_t *pos) |
| 101 | __acquires(RCU) |
| 102 | { |
| 103 | struct ct_iter_state *st = seq->private; |
| 104 | |
| 105 | st->time_now = ktime_get_real_ns(); |
| 106 | rcu_read_lock(); |
| 107 | |
| 108 | nf_conntrack_get_ht(&st->hash, &st->htable_size); |
| 109 | return ct_get_idx(seq, *pos); |
| 110 | } |
| 111 | |
| 112 | static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 113 | { |
| 114 | (*pos)++; |
| 115 | return ct_get_next(s, v); |
| 116 | } |
| 117 | |
| 118 | static void ct_seq_stop(struct seq_file *s, void *v) |
| 119 | __releases(RCU) |
| 120 | { |
| 121 | rcu_read_unlock(); |
| 122 | } |
| 123 | |
| 124 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
| 125 | static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) |
| 126 | { |
| 127 | int ret; |
| 128 | u32 len; |
| 129 | char *secctx; |
| 130 | |
| 131 | ret = security_secid_to_secctx(ct->secmark, &secctx, &len); |
| 132 | if (ret) |
| 133 | return; |
| 134 | |
| 135 | seq_printf(s, "secctx=%s ", secctx); |
| 136 | |
| 137 | security_release_secctx(secctx, len); |
| 138 | } |
| 139 | #else |
| 140 | static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) |
| 141 | { |
| 142 | } |
| 143 | #endif |
| 144 | |
| 145 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 146 | static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct, |
| 147 | int dir) |
| 148 | { |
| 149 | const struct nf_conntrack_zone *zone = nf_ct_zone(ct); |
| 150 | |
| 151 | if (zone->dir != dir) |
| 152 | return; |
| 153 | switch (zone->dir) { |
| 154 | case NF_CT_DEFAULT_ZONE_DIR: |
| 155 | seq_printf(s, "zone=%u ", zone->id); |
| 156 | break; |
| 157 | case NF_CT_ZONE_DIR_ORIG: |
| 158 | seq_printf(s, "zone-orig=%u ", zone->id); |
| 159 | break; |
| 160 | case NF_CT_ZONE_DIR_REPL: |
| 161 | seq_printf(s, "zone-reply=%u ", zone->id); |
| 162 | break; |
| 163 | default: |
| 164 | break; |
| 165 | } |
| 166 | } |
| 167 | #else |
| 168 | static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct, |
| 169 | int dir) |
| 170 | { |
| 171 | } |
| 172 | #endif |
| 173 | |
| 174 | #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP |
| 175 | static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct) |
| 176 | { |
| 177 | struct ct_iter_state *st = s->private; |
| 178 | struct nf_conn_tstamp *tstamp; |
| 179 | s64 delta_time; |
| 180 | |
| 181 | tstamp = nf_conn_tstamp_find(ct); |
| 182 | if (tstamp) { |
| 183 | delta_time = st->time_now - tstamp->start; |
| 184 | if (delta_time > 0) |
| 185 | delta_time = div_s64(delta_time, NSEC_PER_SEC); |
| 186 | else |
| 187 | delta_time = 0; |
| 188 | |
| 189 | seq_printf(s, "delta-time=%llu ", |
| 190 | (unsigned long long)delta_time); |
| 191 | } |
| 192 | return; |
| 193 | } |
| 194 | #else |
| 195 | static inline void |
| 196 | ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct) |
| 197 | { |
| 198 | } |
| 199 | #endif |
| 200 | |
| 201 | /* return 0 on success, 1 in case of error */ |
| 202 | static int ct_seq_show(struct seq_file *s, void *v) |
| 203 | { |
| 204 | struct nf_conntrack_tuple_hash *hash = v; |
| 205 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash); |
| 206 | const struct nf_conntrack_l3proto *l3proto; |
| 207 | const struct nf_conntrack_l4proto *l4proto; |
| 208 | struct net *net = seq_file_net(s); |
| 209 | int ret = 0; |
| 210 | |
| 211 | NF_CT_ASSERT(ct); |
| 212 | if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) |
| 213 | return 0; |
| 214 | |
| 215 | /* we only want to print DIR_ORIGINAL */ |
| 216 | if (NF_CT_DIRECTION(hash)) |
| 217 | goto release; |
| 218 | |
| 219 | if (!net_eq(nf_ct_net(ct), net)) |
| 220 | goto release; |
| 221 | |
| 222 | l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct)); |
| 223 | NF_CT_ASSERT(l3proto); |
| 224 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
| 225 | NF_CT_ASSERT(l4proto); |
| 226 | |
| 227 | ret = -ENOSPC; |
| 228 | seq_printf(s, "%-8s %u %-8s %u %ld ", |
| 229 | l3proto->name, nf_ct_l3num(ct), |
| 230 | l4proto->name, nf_ct_protonum(ct), |
| 231 | nf_ct_expires(ct) / HZ); |
| 232 | |
| 233 | if (l4proto->print_conntrack) |
| 234 | l4proto->print_conntrack(s, ct); |
| 235 | |
| 236 | print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
| 237 | l3proto, l4proto); |
| 238 | |
| 239 | ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG); |
| 240 | |
| 241 | if (seq_has_overflowed(s)) |
| 242 | goto release; |
| 243 | |
| 244 | if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL)) |
| 245 | goto release; |
| 246 | |
| 247 | if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status))) |
| 248 | seq_printf(s, "[UNREPLIED] "); |
| 249 | |
| 250 | print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
| 251 | l3proto, l4proto); |
| 252 | |
| 253 | ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL); |
| 254 | |
| 255 | if (seq_print_acct(s, ct, IP_CT_DIR_REPLY)) |
| 256 | goto release; |
| 257 | |
| 258 | if (test_bit(IPS_ASSURED_BIT, &ct->status)) |
| 259 | seq_printf(s, "[ASSURED] "); |
| 260 | |
| 261 | if (seq_has_overflowed(s)) |
| 262 | goto release; |
| 263 | |
| 264 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
| 265 | seq_printf(s, "mark=%u ", ct->mark); |
| 266 | #endif |
| 267 | |
| 268 | ct_show_secctx(s, ct); |
| 269 | ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR); |
| 270 | ct_show_delta_time(s, ct); |
| 271 | |
| 272 | seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)); |
| 273 | |
| 274 | if (seq_has_overflowed(s)) |
| 275 | goto release; |
| 276 | |
| 277 | ret = 0; |
| 278 | release: |
| 279 | nf_ct_put(ct); |
| 280 | return ret; |
| 281 | } |
| 282 | |
| 283 | static const struct seq_operations ct_seq_ops = { |
| 284 | .start = ct_seq_start, |
| 285 | .next = ct_seq_next, |
| 286 | .stop = ct_seq_stop, |
| 287 | .show = ct_seq_show |
| 288 | }; |
| 289 | |
| 290 | static int ct_open(struct inode *inode, struct file *file) |
| 291 | { |
| 292 | return seq_open_net(inode, file, &ct_seq_ops, |
| 293 | sizeof(struct ct_iter_state)); |
| 294 | } |
| 295 | |
| 296 | static const struct file_operations ct_file_ops = { |
| 297 | .owner = THIS_MODULE, |
| 298 | .open = ct_open, |
| 299 | .read = seq_read, |
| 300 | .llseek = seq_lseek, |
| 301 | .release = seq_release_net, |
| 302 | }; |
| 303 | |
| 304 | static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos) |
| 305 | { |
| 306 | struct net *net = seq_file_net(seq); |
| 307 | int cpu; |
| 308 | |
| 309 | if (*pos == 0) |
| 310 | return SEQ_START_TOKEN; |
| 311 | |
| 312 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
| 313 | if (!cpu_possible(cpu)) |
| 314 | continue; |
| 315 | *pos = cpu + 1; |
| 316 | return per_cpu_ptr(net->ct.stat, cpu); |
| 317 | } |
| 318 | |
| 319 | return NULL; |
| 320 | } |
| 321 | |
| 322 | static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 323 | { |
| 324 | struct net *net = seq_file_net(seq); |
| 325 | int cpu; |
| 326 | |
| 327 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
| 328 | if (!cpu_possible(cpu)) |
| 329 | continue; |
| 330 | *pos = cpu + 1; |
| 331 | return per_cpu_ptr(net->ct.stat, cpu); |
| 332 | } |
| 333 | |
| 334 | return NULL; |
| 335 | } |
| 336 | |
| 337 | static void ct_cpu_seq_stop(struct seq_file *seq, void *v) |
| 338 | { |
| 339 | } |
| 340 | |
| 341 | static int ct_cpu_seq_show(struct seq_file *seq, void *v) |
| 342 | { |
| 343 | struct net *net = seq_file_net(seq); |
| 344 | unsigned int nr_conntracks = atomic_read(&net->ct.count); |
| 345 | const struct ip_conntrack_stat *st = v; |
| 346 | |
| 347 | if (v == SEQ_START_TOKEN) { |
| 348 | seq_printf(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"); |
| 349 | return 0; |
| 350 | } |
| 351 | |
| 352 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x " |
| 353 | "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n", |
| 354 | nr_conntracks, |
| 355 | 0, |
| 356 | st->found, |
| 357 | 0, |
| 358 | st->invalid, |
| 359 | st->ignore, |
| 360 | 0, |
| 361 | 0, |
| 362 | st->insert, |
| 363 | st->insert_failed, |
| 364 | st->drop, |
| 365 | st->early_drop, |
| 366 | st->error, |
| 367 | |
| 368 | st->expect_new, |
| 369 | st->expect_create, |
| 370 | st->expect_delete, |
| 371 | st->search_restart |
| 372 | ); |
| 373 | return 0; |
| 374 | } |
| 375 | |
| 376 | static const struct seq_operations ct_cpu_seq_ops = { |
| 377 | .start = ct_cpu_seq_start, |
| 378 | .next = ct_cpu_seq_next, |
| 379 | .stop = ct_cpu_seq_stop, |
| 380 | .show = ct_cpu_seq_show, |
| 381 | }; |
| 382 | |
| 383 | static int ct_cpu_seq_open(struct inode *inode, struct file *file) |
| 384 | { |
| 385 | return seq_open_net(inode, file, &ct_cpu_seq_ops, |
| 386 | sizeof(struct seq_net_private)); |
| 387 | } |
| 388 | |
| 389 | static const struct file_operations ct_cpu_seq_fops = { |
| 390 | .owner = THIS_MODULE, |
| 391 | .open = ct_cpu_seq_open, |
| 392 | .read = seq_read, |
| 393 | .llseek = seq_lseek, |
| 394 | .release = seq_release_net, |
| 395 | }; |
| 396 | |
| 397 | static int nf_conntrack_standalone_init_proc(struct net *net) |
| 398 | { |
| 399 | struct proc_dir_entry *pde; |
| 400 | kuid_t root_uid; |
| 401 | kgid_t root_gid; |
| 402 | |
| 403 | pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops); |
| 404 | if (!pde) |
| 405 | goto out_nf_conntrack; |
| 406 | |
| 407 | root_uid = make_kuid(net->user_ns, 0); |
| 408 | root_gid = make_kgid(net->user_ns, 0); |
| 409 | if (uid_valid(root_uid) && gid_valid(root_gid)) |
| 410 | proc_set_user(pde, root_uid, root_gid); |
| 411 | |
| 412 | pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat, |
| 413 | &ct_cpu_seq_fops); |
| 414 | if (!pde) |
| 415 | goto out_stat_nf_conntrack; |
| 416 | return 0; |
| 417 | |
| 418 | out_stat_nf_conntrack: |
| 419 | remove_proc_entry("nf_conntrack", net->proc_net); |
| 420 | out_nf_conntrack: |
| 421 | return -ENOMEM; |
| 422 | } |
| 423 | |
| 424 | static void nf_conntrack_standalone_fini_proc(struct net *net) |
| 425 | { |
| 426 | remove_proc_entry("nf_conntrack", net->proc_net_stat); |
| 427 | remove_proc_entry("nf_conntrack", net->proc_net); |
| 428 | } |
| 429 | #else |
| 430 | static int nf_conntrack_standalone_init_proc(struct net *net) |
| 431 | { |
| 432 | return 0; |
| 433 | } |
| 434 | |
| 435 | static void nf_conntrack_standalone_fini_proc(struct net *net) |
| 436 | { |
| 437 | } |
| 438 | #endif /* CONFIG_NF_CONNTRACK_PROCFS */ |
| 439 | |
| 440 | /* Sysctl support */ |
| 441 | |
| 442 | #ifdef CONFIG_SYSCTL |
| 443 | /* Log invalid packets of a given protocol */ |
| 444 | static int log_invalid_proto_min __read_mostly; |
| 445 | static int log_invalid_proto_max __read_mostly = 255; |
| 446 | |
| 447 | /* size the user *wants to set */ |
| 448 | static unsigned int nf_conntrack_htable_size_user __read_mostly; |
| 449 | |
| 450 | static int |
| 451 | nf_conntrack_hash_sysctl(struct ctl_table *table, int write, |
| 452 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 453 | { |
| 454 | int ret; |
| 455 | |
| 456 | ret = proc_dointvec(table, write, buffer, lenp, ppos); |
| 457 | if (ret < 0 || !write) |
| 458 | return ret; |
| 459 | |
| 460 | /* update ret, we might not be able to satisfy request */ |
| 461 | ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user); |
| 462 | |
| 463 | /* update it to the actual value used by conntrack */ |
| 464 | nf_conntrack_htable_size_user = nf_conntrack_htable_size; |
| 465 | return ret; |
| 466 | } |
| 467 | |
| 468 | static struct ctl_table_header *nf_ct_netfilter_header; |
| 469 | |
| 470 | static struct ctl_table nf_ct_sysctl_table[] = { |
| 471 | { |
| 472 | .procname = "nf_conntrack_max", |
| 473 | .data = &nf_conntrack_max, |
| 474 | .maxlen = sizeof(int), |
| 475 | .mode = 0644, |
| 476 | .proc_handler = proc_dointvec, |
| 477 | }, |
| 478 | { |
| 479 | .procname = "nf_conntrack_count", |
| 480 | .data = &init_net.ct.count, |
| 481 | .maxlen = sizeof(int), |
| 482 | .mode = 0444, |
| 483 | .proc_handler = proc_dointvec, |
| 484 | }, |
| 485 | { |
| 486 | .procname = "nf_conntrack_buckets", |
| 487 | .data = &nf_conntrack_htable_size_user, |
| 488 | .maxlen = sizeof(unsigned int), |
| 489 | .mode = 0644, |
| 490 | .proc_handler = nf_conntrack_hash_sysctl, |
| 491 | }, |
| 492 | { |
| 493 | .procname = "nf_conntrack_checksum", |
| 494 | .data = &init_net.ct.sysctl_checksum, |
| 495 | .maxlen = sizeof(unsigned int), |
| 496 | .mode = 0644, |
| 497 | .proc_handler = proc_dointvec, |
| 498 | }, |
| 499 | { |
| 500 | .procname = "nf_conntrack_log_invalid", |
| 501 | .data = &init_net.ct.sysctl_log_invalid, |
| 502 | .maxlen = sizeof(unsigned int), |
| 503 | .mode = 0644, |
| 504 | .proc_handler = proc_dointvec_minmax, |
| 505 | .extra1 = &log_invalid_proto_min, |
| 506 | .extra2 = &log_invalid_proto_max, |
| 507 | }, |
| 508 | { |
| 509 | .procname = "nf_conntrack_expect_max", |
| 510 | .data = &nf_ct_expect_max, |
| 511 | .maxlen = sizeof(int), |
| 512 | .mode = 0644, |
| 513 | .proc_handler = proc_dointvec, |
| 514 | }, |
| 515 | { } |
| 516 | }; |
| 517 | |
| 518 | static struct ctl_table nf_ct_netfilter_table[] = { |
| 519 | { |
| 520 | .procname = "nf_conntrack_max", |
| 521 | .data = &nf_conntrack_max, |
| 522 | .maxlen = sizeof(int), |
| 523 | .mode = 0644, |
| 524 | .proc_handler = proc_dointvec, |
| 525 | }, |
| 526 | { } |
| 527 | }; |
| 528 | |
| 529 | static int nf_conntrack_standalone_init_sysctl(struct net *net) |
| 530 | { |
| 531 | struct ctl_table *table; |
| 532 | |
| 533 | table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table), |
| 534 | GFP_KERNEL); |
| 535 | if (!table) |
| 536 | goto out_kmemdup; |
| 537 | |
| 538 | table[1].data = &net->ct.count; |
| 539 | table[3].data = &net->ct.sysctl_checksum; |
| 540 | table[4].data = &net->ct.sysctl_log_invalid; |
| 541 | |
| 542 | /* Don't export sysctls to unprivileged users */ |
| 543 | if (net->user_ns != &init_user_ns) |
| 544 | table[0].procname = NULL; |
| 545 | |
| 546 | if (!net_eq(&init_net, net)) |
| 547 | table[2].mode = 0444; |
| 548 | |
| 549 | net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table); |
| 550 | if (!net->ct.sysctl_header) |
| 551 | goto out_unregister_netfilter; |
| 552 | |
| 553 | return 0; |
| 554 | |
| 555 | out_unregister_netfilter: |
| 556 | kfree(table); |
| 557 | out_kmemdup: |
| 558 | return -ENOMEM; |
| 559 | } |
| 560 | |
| 561 | static void nf_conntrack_standalone_fini_sysctl(struct net *net) |
| 562 | { |
| 563 | struct ctl_table *table; |
| 564 | |
| 565 | table = net->ct.sysctl_header->ctl_table_arg; |
| 566 | unregister_net_sysctl_table(net->ct.sysctl_header); |
| 567 | kfree(table); |
| 568 | } |
| 569 | #else |
| 570 | static int nf_conntrack_standalone_init_sysctl(struct net *net) |
| 571 | { |
| 572 | return 0; |
| 573 | } |
| 574 | |
| 575 | static void nf_conntrack_standalone_fini_sysctl(struct net *net) |
| 576 | { |
| 577 | } |
| 578 | #endif /* CONFIG_SYSCTL */ |
| 579 | |
| 580 | static int nf_conntrack_pernet_init(struct net *net) |
| 581 | { |
| 582 | int ret; |
| 583 | |
| 584 | ret = nf_conntrack_init_net(net); |
| 585 | if (ret < 0) |
| 586 | goto out_init; |
| 587 | |
| 588 | ret = nf_conntrack_standalone_init_proc(net); |
| 589 | if (ret < 0) |
| 590 | goto out_proc; |
| 591 | |
| 592 | net->ct.sysctl_checksum = 1; |
| 593 | net->ct.sysctl_log_invalid = 0; |
| 594 | ret = nf_conntrack_standalone_init_sysctl(net); |
| 595 | if (ret < 0) |
| 596 | goto out_sysctl; |
| 597 | |
| 598 | return 0; |
| 599 | |
| 600 | out_sysctl: |
| 601 | nf_conntrack_standalone_fini_proc(net); |
| 602 | out_proc: |
| 603 | nf_conntrack_cleanup_net(net); |
| 604 | out_init: |
| 605 | return ret; |
| 606 | } |
| 607 | |
| 608 | static void nf_conntrack_pernet_exit(struct list_head *net_exit_list) |
| 609 | { |
| 610 | struct net *net; |
| 611 | |
| 612 | list_for_each_entry(net, net_exit_list, exit_list) { |
| 613 | nf_conntrack_standalone_fini_sysctl(net); |
| 614 | nf_conntrack_standalone_fini_proc(net); |
| 615 | } |
| 616 | nf_conntrack_cleanup_net_list(net_exit_list); |
| 617 | } |
| 618 | |
| 619 | static struct pernet_operations nf_conntrack_net_ops = { |
| 620 | .init = nf_conntrack_pernet_init, |
| 621 | .exit_batch = nf_conntrack_pernet_exit, |
| 622 | }; |
| 623 | |
| 624 | static int __init nf_conntrack_standalone_init(void) |
| 625 | { |
| 626 | int ret = nf_conntrack_init_start(); |
| 627 | if (ret < 0) |
| 628 | goto out_start; |
| 629 | |
| 630 | #ifdef CONFIG_SYSCTL |
| 631 | nf_ct_netfilter_header = |
| 632 | register_net_sysctl(&init_net, "net", nf_ct_netfilter_table); |
| 633 | if (!nf_ct_netfilter_header) { |
| 634 | pr_err("nf_conntrack: can't register to sysctl.\n"); |
| 635 | ret = -ENOMEM; |
| 636 | goto out_sysctl; |
| 637 | } |
| 638 | |
| 639 | nf_conntrack_htable_size_user = nf_conntrack_htable_size; |
| 640 | #endif |
| 641 | |
| 642 | ret = register_pernet_subsys(&nf_conntrack_net_ops); |
| 643 | if (ret < 0) |
| 644 | goto out_pernet; |
| 645 | |
| 646 | nf_conntrack_init_end(); |
| 647 | return 0; |
| 648 | |
| 649 | out_pernet: |
| 650 | #ifdef CONFIG_SYSCTL |
| 651 | unregister_net_sysctl_table(nf_ct_netfilter_header); |
| 652 | out_sysctl: |
| 653 | #endif |
| 654 | nf_conntrack_cleanup_end(); |
| 655 | out_start: |
| 656 | return ret; |
| 657 | } |
| 658 | |
| 659 | static void __exit nf_conntrack_standalone_fini(void) |
| 660 | { |
| 661 | nf_conntrack_cleanup_start(); |
| 662 | unregister_pernet_subsys(&nf_conntrack_net_ops); |
| 663 | #ifdef CONFIG_SYSCTL |
| 664 | unregister_net_sysctl_table(nf_ct_netfilter_header); |
| 665 | #endif |
| 666 | nf_conntrack_cleanup_end(); |
| 667 | } |
| 668 | |
| 669 | module_init(nf_conntrack_standalone_init); |
| 670 | module_exit(nf_conntrack_standalone_fini); |
| 671 | |
| 672 | /* Some modules need us, but don't depend directly on any symbol. |
| 673 | They should call this. */ |
| 674 | void need_conntrack(void) |
| 675 | { |
| 676 | } |
| 677 | EXPORT_SYMBOL_GPL(need_conntrack); |