1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * NetLabel Domain Hash Table 4 * 5 * This file manages the domain hash table that NetLabel uses to determine 6 * which network labeling protocol to use for a given domain. The NetLabel 7 * system manages static and dynamic label mappings for network protocols such 8 * as CIPSO and RIPSO. 9 * 10 * Author: Paul Moore <paul@paul-moore.com> 11 */ 12 13/* 14 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 15 */ 16 17#include <linux/types.h> 18#include <linux/rculist.h> 19#include <linux/skbuff.h> 20#include <linux/spinlock.h> 21#include <linux/string.h> 22#include <linux/audit.h> 23#include <linux/slab.h> 24#include <net/netlabel.h> 25#include <net/cipso_ipv4.h> 26#include <net/calipso.h> 27#include <asm/bug.h> 28 29#include "netlabel_mgmt.h" 30#include "netlabel_addrlist.h" 31#include "netlabel_calipso.h" 32#include "netlabel_domainhash.h" 33#include "netlabel_user.h" 34 35struct netlbl_domhsh_tbl { 36 struct list_head *tbl; 37 u32 size; 38}; 39 40/* Domain hash table */ 41/* updates should be so rare that having one spinlock for the entire hash table 42 * should be okay */ 43static DEFINE_SPINLOCK(netlbl_domhsh_lock); 44#define netlbl_domhsh_rcu_deref(p) \ 45 rcu_dereference_check(p, lockdep_is_held(&netlbl_domhsh_lock)) 46static struct netlbl_domhsh_tbl __rcu *netlbl_domhsh; 47static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv4; 48static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv6; 49 50/* 51 * Domain Hash Table Helper Functions 52 */ 53 54/** 55 * netlbl_domhsh_free_entry - Frees a domain hash table entry 56 * @entry: the entry's RCU field 57 * 58 * Description: 59 * This function is designed to be used as a callback to the call_rcu() 60 * function so that the memory allocated to a hash table entry can be released 61 * safely. 62 * 63 */ 64static void netlbl_domhsh_free_entry(struct rcu_head *entry) 65{ 66 struct netlbl_dom_map *ptr; 67 struct netlbl_af4list *iter4; 68 struct netlbl_af4list *tmp4; 69#if IS_ENABLED(CONFIG_IPV6) 70 struct netlbl_af6list *iter6; 71 struct netlbl_af6list *tmp6; 72#endif /* IPv6 */ 73 74 ptr = container_of(entry, struct netlbl_dom_map, rcu); 75 if (ptr->def.type == NETLBL_NLTYPE_ADDRSELECT) { 76 netlbl_af4list_foreach_safe(iter4, tmp4, 77 &ptr->def.addrsel->list4) { 78 netlbl_af4list_remove_entry(iter4); 79 kfree(netlbl_domhsh_addr4_entry(iter4)); 80 } 81#if IS_ENABLED(CONFIG_IPV6) 82 netlbl_af6list_foreach_safe(iter6, tmp6, 83 &ptr->def.addrsel->list6) { 84 netlbl_af6list_remove_entry(iter6); 85 kfree(netlbl_domhsh_addr6_entry(iter6)); 86 } 87#endif /* IPv6 */ 88 kfree(ptr->def.addrsel); 89 } 90 kfree(ptr->domain); 91 kfree(ptr); 92} 93 94/** 95 * netlbl_domhsh_hash - Hashing function for the domain hash table 96 * @key: the domain name to hash 97 * 98 * Description: 99 * This is the hashing function for the domain hash table, it returns the 100 * correct bucket number for the domain. The caller is responsible for 101 * ensuring that the hash table is protected with either a RCU read lock or the 102 * hash table lock. 103 * 104 */ 105static u32 netlbl_domhsh_hash(const char *key) 106{ 107 u32 iter; 108 u32 val; 109 u32 len; 110 111 /* This is taken (with slight modification) from 112 * security/selinux/ss/symtab.c:symhash() */ 113 114 for (iter = 0, val = 0, len = strlen(key); iter < len; iter++) 115 val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter]; 116 return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1); 117} 118 119static bool netlbl_family_match(u16 f1, u16 f2) 120{ 121 return (f1 == f2) || (f1 == AF_UNSPEC) || (f2 == AF_UNSPEC); 122} 123 124/** 125 * netlbl_domhsh_search - Search for a domain entry 126 * @domain: the domain 127 * @family: the address family 128 * 129 * Description: 130 * Searches the domain hash table and returns a pointer to the hash table 131 * entry if found, otherwise NULL is returned. @family may be %AF_UNSPEC 132 * which matches any address family entries. The caller is responsible for 133 * ensuring that the hash table is protected with either a RCU read lock or the 134 * hash table lock. 135 * 136 */ 137static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain, 138 u16 family) 139{ 140 u32 bkt; 141 struct list_head *bkt_list; 142 struct netlbl_dom_map *iter; 143 144 if (domain != NULL) { 145 bkt = netlbl_domhsh_hash(domain); 146 bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt]; 147 list_for_each_entry_rcu(iter, bkt_list, list, 148 lockdep_is_held(&netlbl_domhsh_lock)) 149 if (iter->valid && 150 netlbl_family_match(iter->family, family) && 151 strcmp(iter->domain, domain) == 0) 152 return iter; 153 } 154 155 return NULL; 156} 157 158/** 159 * netlbl_domhsh_search_def - Search for a domain entry 160 * @domain: the domain 161 * @family: the address family 162 * 163 * Description: 164 * Searches the domain hash table and returns a pointer to the hash table 165 * entry if an exact match is found, if an exact match is not present in the 166 * hash table then the default entry is returned if valid otherwise NULL is 167 * returned. @family may be %AF_UNSPEC which matches any address family 168 * entries. The caller is responsible ensuring that the hash table is 169 * protected with either a RCU read lock or the hash table lock. 170 * 171 */ 172static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain, 173 u16 family) 174{ 175 struct netlbl_dom_map *entry; 176 177 entry = netlbl_domhsh_search(domain, family); 178 if (entry != NULL) 179 return entry; 180 if (family == AF_INET || family == AF_UNSPEC) { 181 entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv4); 182 if (entry != NULL && entry->valid) 183 return entry; 184 } 185 if (family == AF_INET6 || family == AF_UNSPEC) { 186 entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv6); 187 if (entry != NULL && entry->valid) 188 return entry; 189 } 190 191 return NULL; 192} 193 194/** 195 * netlbl_domhsh_audit_add - Generate an audit entry for an add event 196 * @entry: the entry being added 197 * @addr4: the IPv4 address information 198 * @addr6: the IPv6 address information 199 * @result: the result code 200 * @audit_info: NetLabel audit information 201 * 202 * Description: 203 * Generate an audit record for adding a new NetLabel/LSM mapping entry with 204 * the given information. Caller is responsible for holding the necessary 205 * locks. 206 * 207 */ 208static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry, 209 struct netlbl_af4list *addr4, 210 struct netlbl_af6list *addr6, 211 int result, 212 struct netlbl_audit *audit_info) 213{ 214 struct audit_buffer *audit_buf; 215 struct cipso_v4_doi *cipsov4 = NULL; 216 struct calipso_doi *calipso = NULL; 217 u32 type; 218 219 audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info); 220 if (audit_buf != NULL) { 221 audit_log_format(audit_buf, " nlbl_domain=%s", 222 entry->domain ? entry->domain : "(default)"); 223 if (addr4 != NULL) { 224 struct netlbl_domaddr4_map *map4; 225 map4 = netlbl_domhsh_addr4_entry(addr4); 226 type = map4->def.type; 227 cipsov4 = map4->def.cipso; 228 netlbl_af4list_audit_addr(audit_buf, 0, NULL, 229 addr4->addr, addr4->mask); 230#if IS_ENABLED(CONFIG_IPV6) 231 } else if (addr6 != NULL) { 232 struct netlbl_domaddr6_map *map6; 233 map6 = netlbl_domhsh_addr6_entry(addr6); 234 type = map6->def.type; 235 calipso = map6->def.calipso; 236 netlbl_af6list_audit_addr(audit_buf, 0, NULL, 237 &addr6->addr, &addr6->mask); 238#endif /* IPv6 */ 239 } else { 240 type = entry->def.type; 241 cipsov4 = entry->def.cipso; 242 calipso = entry->def.calipso; 243 } 244 switch (type) { 245 case NETLBL_NLTYPE_UNLABELED: 246 audit_log_format(audit_buf, " nlbl_protocol=unlbl"); 247 break; 248 case NETLBL_NLTYPE_CIPSOV4: 249 BUG_ON(cipsov4 == NULL); 250 audit_log_format(audit_buf, 251 " nlbl_protocol=cipsov4 cipso_doi=%u", 252 cipsov4->doi); 253 break; 254 case NETLBL_NLTYPE_CALIPSO: 255 BUG_ON(calipso == NULL); 256 audit_log_format(audit_buf, 257 " nlbl_protocol=calipso calipso_doi=%u", 258 calipso->doi); 259 break; 260 } 261 audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0); 262 audit_log_end(audit_buf); 263 } 264} 265 266/** 267 * netlbl_domhsh_validate - Validate a new domain mapping entry 268 * @entry: the entry to validate 269 * 270 * This function validates the new domain mapping entry to ensure that it is 271 * a valid entry. Returns zero on success, negative values on failure. 272 * 273 */ 274static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry) 275{ 276 struct netlbl_af4list *iter4; 277 struct netlbl_domaddr4_map *map4; 278#if IS_ENABLED(CONFIG_IPV6) 279 struct netlbl_af6list *iter6; 280 struct netlbl_domaddr6_map *map6; 281#endif /* IPv6 */ 282 283 if (entry == NULL) 284 return -EINVAL; 285 286 if (entry->family != AF_INET && entry->family != AF_INET6 && 287 (entry->family != AF_UNSPEC || 288 entry->def.type != NETLBL_NLTYPE_UNLABELED)) 289 return -EINVAL; 290 291 switch (entry->def.type) { 292 case NETLBL_NLTYPE_UNLABELED: 293 if (entry->def.cipso != NULL || entry->def.calipso != NULL || 294 entry->def.addrsel != NULL) 295 return -EINVAL; 296 break; 297 case NETLBL_NLTYPE_CIPSOV4: 298 if (entry->family != AF_INET || 299 entry->def.cipso == NULL) 300 return -EINVAL; 301 break; 302 case NETLBL_NLTYPE_CALIPSO: 303 if (entry->family != AF_INET6 || 304 entry->def.calipso == NULL) 305 return -EINVAL; 306 break; 307 case NETLBL_NLTYPE_ADDRSELECT: 308 netlbl_af4list_foreach(iter4, &entry->def.addrsel->list4) { 309 map4 = netlbl_domhsh_addr4_entry(iter4); 310 switch (map4->def.type) { 311 case NETLBL_NLTYPE_UNLABELED: 312 if (map4->def.cipso != NULL) 313 return -EINVAL; 314 break; 315 case NETLBL_NLTYPE_CIPSOV4: 316 if (map4->def.cipso == NULL) 317 return -EINVAL; 318 break; 319 default: 320 return -EINVAL; 321 } 322 } 323#if IS_ENABLED(CONFIG_IPV6) 324 netlbl_af6list_foreach(iter6, &entry->def.addrsel->list6) { 325 map6 = netlbl_domhsh_addr6_entry(iter6); 326 switch (map6->def.type) { 327 case NETLBL_NLTYPE_UNLABELED: 328 if (map6->def.calipso != NULL) 329 return -EINVAL; 330 break; 331 case NETLBL_NLTYPE_CALIPSO: 332 if (map6->def.calipso == NULL) 333 return -EINVAL; 334 break; 335 default: 336 return -EINVAL; 337 } 338 } 339#endif /* IPv6 */ 340 break; 341 default: 342 return -EINVAL; 343 } 344 345 return 0; 346} 347 348/* 349 * Domain Hash Table Functions 350 */ 351 352/** 353 * netlbl_domhsh_init - Init for the domain hash 354 * @size: the number of bits to use for the hash buckets 355 * 356 * Description: 357 * Initializes the domain hash table, should be called only by 358 * netlbl_user_init() during initialization. Returns zero on success, non-zero 359 * values on error. 360 * 361 */ 362int __init netlbl_domhsh_init(u32 size) 363{ 364 u32 iter; 365 struct netlbl_domhsh_tbl *hsh_tbl; 366 367 if (size == 0) 368 return -EINVAL; 369 370 hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); 371 if (hsh_tbl == NULL) 372 return -ENOMEM; 373 hsh_tbl->size = 1 << size; 374 hsh_tbl->tbl = kcalloc(hsh_tbl->size, 375 sizeof(struct list_head), 376 GFP_KERNEL); 377 if (hsh_tbl->tbl == NULL) { 378 kfree(hsh_tbl); 379 return -ENOMEM; 380 } 381 for (iter = 0; iter < hsh_tbl->size; iter++) 382 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); 383 384 spin_lock(&netlbl_domhsh_lock); 385 rcu_assign_pointer(netlbl_domhsh, hsh_tbl); 386 spin_unlock(&netlbl_domhsh_lock); 387 388 return 0; 389} 390 391/** 392 * netlbl_domhsh_add - Adds a entry to the domain hash table 393 * @entry: the entry to add 394 * @audit_info: NetLabel audit information 395 * 396 * Description: 397 * Adds a new entry to the domain hash table and handles any updates to the 398 * lower level protocol handler (i.e. CIPSO). @entry->family may be set to 399 * %AF_UNSPEC which will add an entry that matches all address families. This 400 * is only useful for the unlabelled type and will only succeed if there is no 401 * existing entry for any address family with the same domain. Returns zero 402 * on success, negative on failure. 403 * 404 */ 405int netlbl_domhsh_add(struct netlbl_dom_map *entry, 406 struct netlbl_audit *audit_info) 407{ 408 int ret_val = 0; 409 struct netlbl_dom_map *entry_old, *entry_b; 410 struct netlbl_af4list *iter4; 411 struct netlbl_af4list *tmp4; 412#if IS_ENABLED(CONFIG_IPV6) 413 struct netlbl_af6list *iter6; 414 struct netlbl_af6list *tmp6; 415#endif /* IPv6 */ 416 417 ret_val = netlbl_domhsh_validate(entry); 418 if (ret_val != 0) 419 return ret_val; 420 421 /* XXX - we can remove this RCU read lock as the spinlock protects the 422 * entire function, but before we do we need to fixup the 423 * netlbl_af[4,6]list RCU functions to do "the right thing" with 424 * respect to rcu_dereference() when only a spinlock is held. */ 425 rcu_read_lock(); 426 spin_lock(&netlbl_domhsh_lock); 427 if (entry->domain != NULL) 428 entry_old = netlbl_domhsh_search(entry->domain, entry->family); 429 else 430 entry_old = netlbl_domhsh_search_def(entry->domain, 431 entry->family); 432 if (entry_old == NULL) { 433 entry->valid = 1; 434 435 if (entry->domain != NULL) { 436 u32 bkt = netlbl_domhsh_hash(entry->domain); 437 list_add_tail_rcu(&entry->list, 438 &rcu_dereference(netlbl_domhsh)->tbl[bkt]); 439 } else { 440 INIT_LIST_HEAD(&entry->list); 441 switch (entry->family) { 442 case AF_INET: 443 rcu_assign_pointer(netlbl_domhsh_def_ipv4, 444 entry); 445 break; 446 case AF_INET6: 447 rcu_assign_pointer(netlbl_domhsh_def_ipv6, 448 entry); 449 break; 450 case AF_UNSPEC: 451 if (entry->def.type != 452 NETLBL_NLTYPE_UNLABELED) { 453 ret_val = -EINVAL; 454 goto add_return; 455 } 456 entry_b = kzalloc(sizeof(*entry_b), GFP_ATOMIC); 457 if (entry_b == NULL) { 458 ret_val = -ENOMEM; 459 goto add_return; 460 } 461 entry_b->family = AF_INET6; 462 entry_b->def.type = NETLBL_NLTYPE_UNLABELED; 463 entry_b->valid = 1; 464 entry->family = AF_INET; 465 rcu_assign_pointer(netlbl_domhsh_def_ipv4, 466 entry); 467 rcu_assign_pointer(netlbl_domhsh_def_ipv6, 468 entry_b); 469 break; 470 default: 471 /* Already checked in 472 * netlbl_domhsh_validate(). */ 473 ret_val = -EINVAL; 474 goto add_return; 475 } 476 } 477 478 if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { 479 netlbl_af4list_foreach_rcu(iter4, 480 &entry->def.addrsel->list4) 481 netlbl_domhsh_audit_add(entry, iter4, NULL, 482 ret_val, audit_info); 483#if IS_ENABLED(CONFIG_IPV6) 484 netlbl_af6list_foreach_rcu(iter6, 485 &entry->def.addrsel->list6) 486 netlbl_domhsh_audit_add(entry, NULL, iter6, 487 ret_val, audit_info); 488#endif /* IPv6 */ 489 } else 490 netlbl_domhsh_audit_add(entry, NULL, NULL, 491 ret_val, audit_info); 492 } else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT && 493 entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { 494 struct list_head *old_list4; 495 struct list_head *old_list6; 496 497 old_list4 = &entry_old->def.addrsel->list4; 498 old_list6 = &entry_old->def.addrsel->list6; 499 500 /* we only allow the addition of address selectors if all of 501 * the selectors do not exist in the existing domain map */ 502 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) 503 if (netlbl_af4list_search_exact(iter4->addr, 504 iter4->mask, 505 old_list4)) { 506 ret_val = -EEXIST; 507 goto add_return; 508 } 509#if IS_ENABLED(CONFIG_IPV6) 510 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) 511 if (netlbl_af6list_search_exact(&iter6->addr, 512 &iter6->mask, 513 old_list6)) { 514 ret_val = -EEXIST; 515 goto add_return; 516 } 517#endif /* IPv6 */ 518 519 netlbl_af4list_foreach_safe(iter4, tmp4, 520 &entry->def.addrsel->list4) { 521 netlbl_af4list_remove_entry(iter4); 522 iter4->valid = 1; 523 ret_val = netlbl_af4list_add(iter4, old_list4); 524 netlbl_domhsh_audit_add(entry_old, iter4, NULL, 525 ret_val, audit_info); 526 if (ret_val != 0) 527 goto add_return; 528 } 529#if IS_ENABLED(CONFIG_IPV6) 530 netlbl_af6list_foreach_safe(iter6, tmp6, 531 &entry->def.addrsel->list6) { 532 netlbl_af6list_remove_entry(iter6); 533 iter6->valid = 1; 534 ret_val = netlbl_af6list_add(iter6, old_list6); 535 netlbl_domhsh_audit_add(entry_old, NULL, iter6, 536 ret_val, audit_info); 537 if (ret_val != 0) 538 goto add_return; 539 } 540#endif /* IPv6 */ 541 /* cleanup the new entry since we've moved everything over */ 542 netlbl_domhsh_free_entry(&entry->rcu); 543 } else 544 ret_val = -EINVAL; 545 546add_return: 547 spin_unlock(&netlbl_domhsh_lock); 548 rcu_read_unlock(); 549 return ret_val; 550} 551 552/** 553 * netlbl_domhsh_add_default - Adds the default entry to the domain hash table 554 * @entry: the entry to add 555 * @audit_info: NetLabel audit information 556 * 557 * Description: 558 * Adds a new default entry to the domain hash table and handles any updates 559 * to the lower level protocol handler (i.e. CIPSO). Returns zero on success, 560 * negative on failure. 561 * 562 */ 563int netlbl_domhsh_add_default(struct netlbl_dom_map *entry, 564 struct netlbl_audit *audit_info) 565{ 566 return netlbl_domhsh_add(entry, audit_info); 567} 568 569/** 570 * netlbl_domhsh_remove_entry - Removes a given entry from the domain table 571 * @entry: the entry to remove 572 * @audit_info: NetLabel audit information 573 * 574 * Description: 575 * Removes an entry from the domain hash table and handles any updates to the 576 * lower level protocol handler (i.e. CIPSO). Caller is responsible for 577 * ensuring that the RCU read lock is held. Returns zero on success, negative 578 * on failure. 579 * 580 */ 581int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry, 582 struct netlbl_audit *audit_info) 583{ 584 int ret_val = 0; 585 struct audit_buffer *audit_buf; 586 struct netlbl_af4list *iter4; 587 struct netlbl_domaddr4_map *map4; 588#if IS_ENABLED(CONFIG_IPV6) 589 struct netlbl_af6list *iter6; 590 struct netlbl_domaddr6_map *map6; 591#endif /* IPv6 */ 592 593 if (entry == NULL) 594 return -ENOENT; 595 596 spin_lock(&netlbl_domhsh_lock); 597 if (entry->valid) { 598 entry->valid = 0; 599 if (entry == rcu_dereference(netlbl_domhsh_def_ipv4)) 600 RCU_INIT_POINTER(netlbl_domhsh_def_ipv4, NULL); 601 else if (entry == rcu_dereference(netlbl_domhsh_def_ipv6)) 602 RCU_INIT_POINTER(netlbl_domhsh_def_ipv6, NULL); 603 else 604 list_del_rcu(&entry->list); 605 } else 606 ret_val = -ENOENT; 607 spin_unlock(&netlbl_domhsh_lock); 608 609 if (ret_val) 610 return ret_val; 611 612 audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info); 613 if (audit_buf != NULL) { 614 audit_log_format(audit_buf, 615 " nlbl_domain=%s res=1", 616 entry->domain ? entry->domain : "(default)"); 617 audit_log_end(audit_buf); 618 } 619 620 switch (entry->def.type) { 621 case NETLBL_NLTYPE_ADDRSELECT: 622 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) { 623 map4 = netlbl_domhsh_addr4_entry(iter4); 624 cipso_v4_doi_putdef(map4->def.cipso); 625 } 626#if IS_ENABLED(CONFIG_IPV6) 627 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) { 628 map6 = netlbl_domhsh_addr6_entry(iter6); 629 calipso_doi_putdef(map6->def.calipso); 630 } 631#endif /* IPv6 */ 632 break; 633 case NETLBL_NLTYPE_CIPSOV4: 634 cipso_v4_doi_putdef(entry->def.cipso); 635 break; 636#if IS_ENABLED(CONFIG_IPV6) 637 case NETLBL_NLTYPE_CALIPSO: 638 calipso_doi_putdef(entry->def.calipso); 639 break; 640#endif /* IPv6 */ 641 } 642 call_rcu(&entry->rcu, netlbl_domhsh_free_entry); 643 644 return ret_val; 645} 646 647/** 648 * netlbl_domhsh_remove_af4 - Removes an address selector entry 649 * @domain: the domain 650 * @addr: IPv4 address 651 * @mask: IPv4 address mask 652 * @audit_info: NetLabel audit information 653 * 654 * Description: 655 * Removes an individual address selector from a domain mapping and potentially 656 * the entire mapping if it is empty. Returns zero on success, negative values 657 * on failure. 658 * 659 */ 660int netlbl_domhsh_remove_af4(const char *domain, 661 const struct in_addr *addr, 662 const struct in_addr *mask, 663 struct netlbl_audit *audit_info) 664{ 665 struct netlbl_dom_map *entry_map; 666 struct netlbl_af4list *entry_addr; 667 struct netlbl_af4list *iter4; 668#if IS_ENABLED(CONFIG_IPV6) 669 struct netlbl_af6list *iter6; 670#endif /* IPv6 */ 671 struct netlbl_domaddr4_map *entry; 672 673 rcu_read_lock(); 674 675 if (domain) 676 entry_map = netlbl_domhsh_search(domain, AF_INET); 677 else 678 entry_map = netlbl_domhsh_search_def(domain, AF_INET); 679 if (entry_map == NULL || 680 entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT) 681 goto remove_af4_failure; 682 683 spin_lock(&netlbl_domhsh_lock); 684 entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr, 685 &entry_map->def.addrsel->list4); 686 spin_unlock(&netlbl_domhsh_lock); 687 688 if (entry_addr == NULL) 689 goto remove_af4_failure; 690 netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4) 691 goto remove_af4_single_addr; 692#if IS_ENABLED(CONFIG_IPV6) 693 netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6) 694 goto remove_af4_single_addr; 695#endif /* IPv6 */ 696 /* the domain mapping is empty so remove it from the mapping table */ 697 netlbl_domhsh_remove_entry(entry_map, audit_info); 698 699remove_af4_single_addr: 700 rcu_read_unlock(); 701 /* yick, we can't use call_rcu here because we don't have a rcu head 702 * pointer but hopefully this should be a rare case so the pause 703 * shouldn't be a problem */ 704 synchronize_rcu(); 705 entry = netlbl_domhsh_addr4_entry(entry_addr); 706 cipso_v4_doi_putdef(entry->def.cipso); 707 kfree(entry); 708 return 0; 709 710remove_af4_failure: 711 rcu_read_unlock(); 712 return -ENOENT; 713} 714 715#if IS_ENABLED(CONFIG_IPV6) 716/** 717 * netlbl_domhsh_remove_af6 - Removes an address selector entry 718 * @domain: the domain 719 * @addr: IPv6 address 720 * @mask: IPv6 address mask 721 * @audit_info: NetLabel audit information 722 * 723 * Description: 724 * Removes an individual address selector from a domain mapping and potentially 725 * the entire mapping if it is empty. Returns zero on success, negative values 726 * on failure. 727 * 728 */ 729int netlbl_domhsh_remove_af6(const char *domain, 730 const struct in6_addr *addr, 731 const struct in6_addr *mask, 732 struct netlbl_audit *audit_info) 733{ 734 struct netlbl_dom_map *entry_map; 735 struct netlbl_af6list *entry_addr; 736 struct netlbl_af4list *iter4; 737 struct netlbl_af6list *iter6; 738 struct netlbl_domaddr6_map *entry; 739 740 rcu_read_lock(); 741 742 if (domain) 743 entry_map = netlbl_domhsh_search(domain, AF_INET6); 744 else 745 entry_map = netlbl_domhsh_search_def(domain, AF_INET6); 746 if (entry_map == NULL || 747 entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT) 748 goto remove_af6_failure; 749 750 spin_lock(&netlbl_domhsh_lock); 751 entry_addr = netlbl_af6list_remove(addr, mask, 752 &entry_map->def.addrsel->list6); 753 spin_unlock(&netlbl_domhsh_lock); 754 755 if (entry_addr == NULL) 756 goto remove_af6_failure; 757 netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4) 758 goto remove_af6_single_addr; 759 netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6) 760 goto remove_af6_single_addr; 761 /* the domain mapping is empty so remove it from the mapping table */ 762 netlbl_domhsh_remove_entry(entry_map, audit_info); 763 764remove_af6_single_addr: 765 rcu_read_unlock(); 766 /* yick, we can't use call_rcu here because we don't have a rcu head 767 * pointer but hopefully this should be a rare case so the pause 768 * shouldn't be a problem */ 769 synchronize_rcu(); 770 entry = netlbl_domhsh_addr6_entry(entry_addr); 771 calipso_doi_putdef(entry->def.calipso); 772 kfree(entry); 773 return 0; 774 775remove_af6_failure: 776 rcu_read_unlock(); 777 return -ENOENT; 778} 779#endif /* IPv6 */ 780 781/** 782 * netlbl_domhsh_remove - Removes an entry from the domain hash table 783 * @domain: the domain to remove 784 * @family: address family 785 * @audit_info: NetLabel audit information 786 * 787 * Description: 788 * Removes an entry from the domain hash table and handles any updates to the 789 * lower level protocol handler (i.e. CIPSO). @family may be %AF_UNSPEC which 790 * removes all address family entries. Returns zero on success, negative on 791 * failure. 792 * 793 */ 794int netlbl_domhsh_remove(const char *domain, u16 family, 795 struct netlbl_audit *audit_info) 796{ 797 int ret_val = -EINVAL; 798 struct netlbl_dom_map *entry; 799 800 rcu_read_lock(); 801 802 if (family == AF_INET || family == AF_UNSPEC) { 803 if (domain) 804 entry = netlbl_domhsh_search(domain, AF_INET); 805 else 806 entry = netlbl_domhsh_search_def(domain, AF_INET); 807 ret_val = netlbl_domhsh_remove_entry(entry, audit_info); 808 if (ret_val && ret_val != -ENOENT) 809 goto done; 810 } 811 if (family == AF_INET6 || family == AF_UNSPEC) { 812 int ret_val2; 813 814 if (domain) 815 entry = netlbl_domhsh_search(domain, AF_INET6); 816 else 817 entry = netlbl_domhsh_search_def(domain, AF_INET6); 818 ret_val2 = netlbl_domhsh_remove_entry(entry, audit_info); 819 if (ret_val2 != -ENOENT) 820 ret_val = ret_val2; 821 } 822done: 823 rcu_read_unlock(); 824 825 return ret_val; 826} 827 828/** 829 * netlbl_domhsh_remove_default - Removes the default entry from the table 830 * @family: address family 831 * @audit_info: NetLabel audit information 832 * 833 * Description: 834 * Removes/resets the default entry corresponding to @family from the domain 835 * hash table and handles any updates to the lower level protocol handler 836 * (i.e. CIPSO). @family may be %AF_UNSPEC which removes all address family 837 * entries. Returns zero on success, negative on failure. 838 * 839 */ 840int netlbl_domhsh_remove_default(u16 family, struct netlbl_audit *audit_info) 841{ 842 return netlbl_domhsh_remove(NULL, family, audit_info); 843} 844 845/** 846 * netlbl_domhsh_getentry - Get an entry from the domain hash table 847 * @domain: the domain name to search for 848 * @family: address family 849 * 850 * Description: 851 * Look through the domain hash table searching for an entry to match @domain, 852 * with address family @family, return a pointer to a copy of the entry or 853 * NULL. The caller is responsible for ensuring that rcu_read_[un]lock() is 854 * called. 855 * 856 */ 857struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain, u16 family) 858{ 859 if (family == AF_UNSPEC) 860 return NULL; 861 return netlbl_domhsh_search_def(domain, family); 862} 863 864/** 865 * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table 866 * @domain: the domain name to search for 867 * @addr: the IP address to search for 868 * 869 * Description: 870 * Look through the domain hash table searching for an entry to match @domain 871 * and @addr, return a pointer to a copy of the entry or NULL. The caller is 872 * responsible for ensuring that rcu_read_[un]lock() is called. 873 * 874 */ 875struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain, 876 __be32 addr) 877{ 878 struct netlbl_dom_map *dom_iter; 879 struct netlbl_af4list *addr_iter; 880 881 dom_iter = netlbl_domhsh_search_def(domain, AF_INET); 882 if (dom_iter == NULL) 883 return NULL; 884 885 if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT) 886 return &dom_iter->def; 887 addr_iter = netlbl_af4list_search(addr, &dom_iter->def.addrsel->list4); 888 if (addr_iter == NULL) 889 return NULL; 890 return &(netlbl_domhsh_addr4_entry(addr_iter)->def); 891} 892 893#if IS_ENABLED(CONFIG_IPV6) 894/** 895 * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table 896 * @domain: the domain name to search for 897 * @addr: the IP address to search for 898 * 899 * Description: 900 * Look through the domain hash table searching for an entry to match @domain 901 * and @addr, return a pointer to a copy of the entry or NULL. The caller is 902 * responsible for ensuring that rcu_read_[un]lock() is called. 903 * 904 */ 905struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain, 906 const struct in6_addr *addr) 907{ 908 struct netlbl_dom_map *dom_iter; 909 struct netlbl_af6list *addr_iter; 910 911 dom_iter = netlbl_domhsh_search_def(domain, AF_INET6); 912 if (dom_iter == NULL) 913 return NULL; 914 915 if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT) 916 return &dom_iter->def; 917 addr_iter = netlbl_af6list_search(addr, &dom_iter->def.addrsel->list6); 918 if (addr_iter == NULL) 919 return NULL; 920 return &(netlbl_domhsh_addr6_entry(addr_iter)->def); 921} 922#endif /* IPv6 */ 923 924/** 925 * netlbl_domhsh_walk - Iterate through the domain mapping hash table 926 * @skip_bkt: the number of buckets to skip at the start 927 * @skip_chain: the number of entries to skip in the first iterated bucket 928 * @callback: callback for each entry 929 * @cb_arg: argument for the callback function 930 * 931 * Description: 932 * Iterate over the domain mapping hash table, skipping the first @skip_bkt 933 * buckets and @skip_chain entries. For each entry in the table call 934 * @callback, if @callback returns a negative value stop 'walking' through the 935 * table and return. Updates the values in @skip_bkt and @skip_chain on 936 * return. Returns zero on success, negative values on failure. 937 * 938 */ 939int netlbl_domhsh_walk(u32 *skip_bkt, 940 u32 *skip_chain, 941 int (*callback) (struct netlbl_dom_map *entry, void *arg), 942 void *cb_arg) 943{ 944 int ret_val = -ENOENT; 945 u32 iter_bkt; 946 struct list_head *iter_list; 947 struct netlbl_dom_map *iter_entry; 948 u32 chain_cnt = 0; 949 950 rcu_read_lock(); 951 for (iter_bkt = *skip_bkt; 952 iter_bkt < rcu_dereference(netlbl_domhsh)->size; 953 iter_bkt++, chain_cnt = 0) { 954 iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt]; 955 list_for_each_entry_rcu(iter_entry, iter_list, list) 956 if (iter_entry->valid) { 957 if (chain_cnt++ < *skip_chain) 958 continue; 959 ret_val = callback(iter_entry, cb_arg); 960 if (ret_val < 0) { 961 chain_cnt--; 962 goto walk_return; 963 } 964 } 965 } 966 967walk_return: 968 rcu_read_unlock(); 969 *skip_bkt = iter_bkt; 970 *skip_chain = chain_cnt; 971 return ret_val; 972} 973