1 /* 2 * NetLabel Kernel API 3 * 4 * This file defines the kernel API for the NetLabel system. The NetLabel 5 * system manages static and dynamic label mappings for network protocols such 6 * as CIPSO and RIPSO. 7 * 8 * Author: Paul Moore <paul@paul-moore.com> 9 * 10 */ 11 12 /* 13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 14 * 15 * This program is free software; you can redistribute it and/or modify 16 * it under the terms of the GNU General Public License as published by 17 * the Free Software Foundation; either version 2 of the License, or 18 * (at your option) any later version. 19 * 20 * This program is distributed in the hope that it will be useful, 21 * but WITHOUT ANY WARRANTY; without even the implied warranty of 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 23 * the GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, see <http://www.gnu.org/licenses/>. 27 * 28 */ 29 30 #include <linux/init.h> 31 #include <linux/types.h> 32 #include <linux/slab.h> 33 #include <linux/audit.h> 34 #include <linux/in.h> 35 #include <linux/in6.h> 36 #include <net/ip.h> 37 #include <net/ipv6.h> 38 #include <net/netlabel.h> 39 #include <net/cipso_ipv4.h> 40 #include <net/calipso.h> 41 #include <asm/bug.h> 42 #include <linux/atomic.h> 43 44 #include "netlabel_domainhash.h" 45 #include "netlabel_unlabeled.h" 46 #include "netlabel_cipso_v4.h" 47 #include "netlabel_calipso.h" 48 #include "netlabel_user.h" 49 #include "netlabel_mgmt.h" 50 #include "netlabel_addrlist.h" 51 52 /* 53 * Configuration Functions 54 */ 55 56 /** 57 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping 58 * @domain: the domain mapping to remove 59 * @family: address family 60 * @addr: IP address 61 * @mask: IP address mask 62 * @audit_info: NetLabel audit information 63 * 64 * Description: 65 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the 66 * default domain mapping to be removed. Returns zero on success, negative 67 * values on failure. 68 * 69 */ 70 int netlbl_cfg_map_del(const char *domain, 71 u16 family, 72 const void *addr, 73 const void *mask, 74 struct netlbl_audit *audit_info) 75 { 76 if (addr == NULL && mask == NULL) { 77 return netlbl_domhsh_remove(domain, family, audit_info); 78 } else if (addr != NULL && mask != NULL) { 79 switch (family) { 80 case AF_INET: 81 return netlbl_domhsh_remove_af4(domain, addr, mask, 82 audit_info); 83 #if IS_ENABLED(CONFIG_IPV6) 84 case AF_INET6: 85 return netlbl_domhsh_remove_af6(domain, addr, mask, 86 audit_info); 87 #endif /* IPv6 */ 88 default: 89 return -EPFNOSUPPORT; 90 } 91 } else 92 return -EINVAL; 93 } 94 95 /** 96 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping 97 * @domain: the domain mapping to add 98 * @family: address family 99 * @addr: IP address 100 * @mask: IP address mask 101 * @audit_info: NetLabel audit information 102 * 103 * Description: 104 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL 105 * causes a new default domain mapping to be added. Returns zero on success, 106 * negative values on failure. 107 * 108 */ 109 int netlbl_cfg_unlbl_map_add(const char *domain, 110 u16 family, 111 const void *addr, 112 const void *mask, 113 struct netlbl_audit *audit_info) 114 { 115 int ret_val = -ENOMEM; 116 struct netlbl_dom_map *entry; 117 struct netlbl_domaddr_map *addrmap = NULL; 118 struct netlbl_domaddr4_map *map4 = NULL; 119 struct netlbl_domaddr6_map *map6 = NULL; 120 121 entry = kzalloc(sizeof(*entry), GFP_ATOMIC); 122 if (entry == NULL) 123 return -ENOMEM; 124 if (domain != NULL) { 125 entry->domain = kstrdup(domain, GFP_ATOMIC); 126 if (entry->domain == NULL) 127 goto cfg_unlbl_map_add_failure; 128 } 129 entry->family = family; 130 131 if (addr == NULL && mask == NULL) 132 entry->def.type = NETLBL_NLTYPE_UNLABELED; 133 else if (addr != NULL && mask != NULL) { 134 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); 135 if (addrmap == NULL) 136 goto cfg_unlbl_map_add_failure; 137 INIT_LIST_HEAD(&addrmap->list4); 138 INIT_LIST_HEAD(&addrmap->list6); 139 140 switch (family) { 141 case AF_INET: { 142 const struct in_addr *addr4 = addr; 143 const struct in_addr *mask4 = mask; 144 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC); 145 if (map4 == NULL) 146 goto cfg_unlbl_map_add_failure; 147 map4->def.type = NETLBL_NLTYPE_UNLABELED; 148 map4->list.addr = addr4->s_addr & mask4->s_addr; 149 map4->list.mask = mask4->s_addr; 150 map4->list.valid = 1; 151 ret_val = netlbl_af4list_add(&map4->list, 152 &addrmap->list4); 153 if (ret_val != 0) 154 goto cfg_unlbl_map_add_failure; 155 break; 156 } 157 #if IS_ENABLED(CONFIG_IPV6) 158 case AF_INET6: { 159 const struct in6_addr *addr6 = addr; 160 const struct in6_addr *mask6 = mask; 161 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC); 162 if (map6 == NULL) 163 goto cfg_unlbl_map_add_failure; 164 map6->def.type = NETLBL_NLTYPE_UNLABELED; 165 map6->list.addr = *addr6; 166 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0]; 167 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1]; 168 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2]; 169 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3]; 170 map6->list.mask = *mask6; 171 map6->list.valid = 1; 172 ret_val = netlbl_af6list_add(&map6->list, 173 &addrmap->list6); 174 if (ret_val != 0) 175 goto cfg_unlbl_map_add_failure; 176 break; 177 } 178 #endif /* IPv6 */ 179 default: 180 goto cfg_unlbl_map_add_failure; 181 } 182 183 entry->def.addrsel = addrmap; 184 entry->def.type = NETLBL_NLTYPE_ADDRSELECT; 185 } else { 186 ret_val = -EINVAL; 187 goto cfg_unlbl_map_add_failure; 188 } 189 190 ret_val = netlbl_domhsh_add(entry, audit_info); 191 if (ret_val != 0) 192 goto cfg_unlbl_map_add_failure; 193 194 return 0; 195 196 cfg_unlbl_map_add_failure: 197 kfree(entry->domain); 198 kfree(entry); 199 kfree(addrmap); 200 kfree(map4); 201 kfree(map6); 202 return ret_val; 203 } 204 205 206 /** 207 * netlbl_cfg_unlbl_static_add - Adds a new static label 208 * @net: network namespace 209 * @dev_name: interface name 210 * @addr: IP address in network byte order (struct in[6]_addr) 211 * @mask: address mask in network byte order (struct in[6]_addr) 212 * @family: address family 213 * @secid: LSM secid value for the entry 214 * @audit_info: NetLabel audit information 215 * 216 * Description: 217 * Adds a new NetLabel static label to be used when protocol provided labels 218 * are not present on incoming traffic. If @dev_name is NULL then the default 219 * interface will be used. Returns zero on success, negative values on failure. 220 * 221 */ 222 int netlbl_cfg_unlbl_static_add(struct net *net, 223 const char *dev_name, 224 const void *addr, 225 const void *mask, 226 u16 family, 227 u32 secid, 228 struct netlbl_audit *audit_info) 229 { 230 u32 addr_len; 231 232 switch (family) { 233 case AF_INET: 234 addr_len = sizeof(struct in_addr); 235 break; 236 #if IS_ENABLED(CONFIG_IPV6) 237 case AF_INET6: 238 addr_len = sizeof(struct in6_addr); 239 break; 240 #endif /* IPv6 */ 241 default: 242 return -EPFNOSUPPORT; 243 } 244 245 return netlbl_unlhsh_add(net, 246 dev_name, addr, mask, addr_len, 247 secid, audit_info); 248 } 249 250 /** 251 * netlbl_cfg_unlbl_static_del - Removes an existing static label 252 * @net: network namespace 253 * @dev_name: interface name 254 * @addr: IP address in network byte order (struct in[6]_addr) 255 * @mask: address mask in network byte order (struct in[6]_addr) 256 * @family: address family 257 * @audit_info: NetLabel audit information 258 * 259 * Description: 260 * Removes an existing NetLabel static label used when protocol provided labels 261 * are not present on incoming traffic. If @dev_name is NULL then the default 262 * interface will be used. Returns zero on success, negative values on failure. 263 * 264 */ 265 int netlbl_cfg_unlbl_static_del(struct net *net, 266 const char *dev_name, 267 const void *addr, 268 const void *mask, 269 u16 family, 270 struct netlbl_audit *audit_info) 271 { 272 u32 addr_len; 273 274 switch (family) { 275 case AF_INET: 276 addr_len = sizeof(struct in_addr); 277 break; 278 #if IS_ENABLED(CONFIG_IPV6) 279 case AF_INET6: 280 addr_len = sizeof(struct in6_addr); 281 break; 282 #endif /* IPv6 */ 283 default: 284 return -EPFNOSUPPORT; 285 } 286 287 return netlbl_unlhsh_remove(net, 288 dev_name, addr, mask, addr_len, 289 audit_info); 290 } 291 292 /** 293 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition 294 * @doi_def: CIPSO DOI definition 295 * @audit_info: NetLabel audit information 296 * 297 * Description: 298 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on 299 * success and negative values on failure. 300 * 301 */ 302 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, 303 struct netlbl_audit *audit_info) 304 { 305 return cipso_v4_doi_add(doi_def, audit_info); 306 } 307 308 /** 309 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition 310 * @doi: CIPSO DOI 311 * @audit_info: NetLabel audit information 312 * 313 * Description: 314 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on 315 * success and negative values on failure. 316 * 317 */ 318 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info) 319 { 320 cipso_v4_doi_remove(doi, audit_info); 321 } 322 323 /** 324 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping 325 * @doi: the CIPSO DOI 326 * @domain: the domain mapping to add 327 * @addr: IP address 328 * @mask: IP address mask 329 * @audit_info: NetLabel audit information 330 * 331 * Description: 332 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel 333 * subsystem. A @domain value of NULL adds a new default domain mapping. 334 * Returns zero on success, negative values on failure. 335 * 336 */ 337 int netlbl_cfg_cipsov4_map_add(u32 doi, 338 const char *domain, 339 const struct in_addr *addr, 340 const struct in_addr *mask, 341 struct netlbl_audit *audit_info) 342 { 343 int ret_val = -ENOMEM; 344 struct cipso_v4_doi *doi_def; 345 struct netlbl_dom_map *entry; 346 struct netlbl_domaddr_map *addrmap = NULL; 347 struct netlbl_domaddr4_map *addrinfo = NULL; 348 349 doi_def = cipso_v4_doi_getdef(doi); 350 if (doi_def == NULL) 351 return -ENOENT; 352 353 entry = kzalloc(sizeof(*entry), GFP_ATOMIC); 354 if (entry == NULL) 355 goto out_entry; 356 entry->family = AF_INET; 357 if (domain != NULL) { 358 entry->domain = kstrdup(domain, GFP_ATOMIC); 359 if (entry->domain == NULL) 360 goto out_domain; 361 } 362 363 if (addr == NULL && mask == NULL) { 364 entry->def.cipso = doi_def; 365 entry->def.type = NETLBL_NLTYPE_CIPSOV4; 366 } else if (addr != NULL && mask != NULL) { 367 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); 368 if (addrmap == NULL) 369 goto out_addrmap; 370 INIT_LIST_HEAD(&addrmap->list4); 371 INIT_LIST_HEAD(&addrmap->list6); 372 373 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC); 374 if (addrinfo == NULL) 375 goto out_addrinfo; 376 addrinfo->def.cipso = doi_def; 377 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4; 378 addrinfo->list.addr = addr->s_addr & mask->s_addr; 379 addrinfo->list.mask = mask->s_addr; 380 addrinfo->list.valid = 1; 381 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4); 382 if (ret_val != 0) 383 goto cfg_cipsov4_map_add_failure; 384 385 entry->def.addrsel = addrmap; 386 entry->def.type = NETLBL_NLTYPE_ADDRSELECT; 387 } else { 388 ret_val = -EINVAL; 389 goto out_addrmap; 390 } 391 392 ret_val = netlbl_domhsh_add(entry, audit_info); 393 if (ret_val != 0) 394 goto cfg_cipsov4_map_add_failure; 395 396 return 0; 397 398 cfg_cipsov4_map_add_failure: 399 kfree(addrinfo); 400 out_addrinfo: 401 kfree(addrmap); 402 out_addrmap: 403 kfree(entry->domain); 404 out_domain: 405 kfree(entry); 406 out_entry: 407 cipso_v4_doi_putdef(doi_def); 408 return ret_val; 409 } 410 411 /** 412 * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition 413 * @doi_def: CALIPSO DOI definition 414 * @audit_info: NetLabel audit information 415 * 416 * Description: 417 * Add a new CALIPSO DOI definition as defined by @doi_def. Returns zero on 418 * success and negative values on failure. 419 * 420 */ 421 int netlbl_cfg_calipso_add(struct calipso_doi *doi_def, 422 struct netlbl_audit *audit_info) 423 { 424 #if IS_ENABLED(CONFIG_IPV6) 425 return calipso_doi_add(doi_def, audit_info); 426 #else /* IPv6 */ 427 return -ENOSYS; 428 #endif /* IPv6 */ 429 } 430 431 /** 432 * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition 433 * @doi: CALIPSO DOI 434 * @audit_info: NetLabel audit information 435 * 436 * Description: 437 * Remove an existing CALIPSO DOI definition matching @doi. Returns zero on 438 * success and negative values on failure. 439 * 440 */ 441 void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info) 442 { 443 #if IS_ENABLED(CONFIG_IPV6) 444 calipso_doi_remove(doi, audit_info); 445 #endif /* IPv6 */ 446 } 447 448 /** 449 * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping 450 * @doi: the CALIPSO DOI 451 * @domain: the domain mapping to add 452 * @addr: IP address 453 * @mask: IP address mask 454 * @audit_info: NetLabel audit information 455 * 456 * Description: 457 * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the 458 * NetLabel subsystem. A @domain value of NULL adds a new default domain 459 * mapping. Returns zero on success, negative values on failure. 460 * 461 */ 462 int netlbl_cfg_calipso_map_add(u32 doi, 463 const char *domain, 464 const struct in6_addr *addr, 465 const struct in6_addr *mask, 466 struct netlbl_audit *audit_info) 467 { 468 #if IS_ENABLED(CONFIG_IPV6) 469 int ret_val = -ENOMEM; 470 struct calipso_doi *doi_def; 471 struct netlbl_dom_map *entry; 472 struct netlbl_domaddr_map *addrmap = NULL; 473 struct netlbl_domaddr6_map *addrinfo = NULL; 474 475 doi_def = calipso_doi_getdef(doi); 476 if (doi_def == NULL) 477 return -ENOENT; 478 479 entry = kzalloc(sizeof(*entry), GFP_ATOMIC); 480 if (entry == NULL) 481 goto out_entry; 482 entry->family = AF_INET6; 483 if (domain != NULL) { 484 entry->domain = kstrdup(domain, GFP_ATOMIC); 485 if (entry->domain == NULL) 486 goto out_domain; 487 } 488 489 if (addr == NULL && mask == NULL) { 490 entry->def.calipso = doi_def; 491 entry->def.type = NETLBL_NLTYPE_CALIPSO; 492 } else if (addr != NULL && mask != NULL) { 493 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); 494 if (addrmap == NULL) 495 goto out_addrmap; 496 INIT_LIST_HEAD(&addrmap->list4); 497 INIT_LIST_HEAD(&addrmap->list6); 498 499 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC); 500 if (addrinfo == NULL) 501 goto out_addrinfo; 502 addrinfo->def.calipso = doi_def; 503 addrinfo->def.type = NETLBL_NLTYPE_CALIPSO; 504 addrinfo->list.addr = *addr; 505 addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; 506 addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; 507 addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2]; 508 addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3]; 509 addrinfo->list.mask = *mask; 510 addrinfo->list.valid = 1; 511 ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6); 512 if (ret_val != 0) 513 goto cfg_calipso_map_add_failure; 514 515 entry->def.addrsel = addrmap; 516 entry->def.type = NETLBL_NLTYPE_ADDRSELECT; 517 } else { 518 ret_val = -EINVAL; 519 goto out_addrmap; 520 } 521 522 ret_val = netlbl_domhsh_add(entry, audit_info); 523 if (ret_val != 0) 524 goto cfg_calipso_map_add_failure; 525 526 return 0; 527 528 cfg_calipso_map_add_failure: 529 kfree(addrinfo); 530 out_addrinfo: 531 kfree(addrmap); 532 out_addrmap: 533 kfree(entry->domain); 534 out_domain: 535 kfree(entry); 536 out_entry: 537 calipso_doi_putdef(doi_def); 538 return ret_val; 539 #else /* IPv6 */ 540 return -ENOSYS; 541 #endif /* IPv6 */ 542 } 543 544 /* 545 * Security Attribute Functions 546 */ 547 548 #define _CM_F_NONE 0x00000000 549 #define _CM_F_ALLOC 0x00000001 550 #define _CM_F_WALK 0x00000002 551 552 /** 553 * _netlbl_catmap_getnode - Get a individual node from a catmap 554 * @catmap: pointer to the category bitmap 555 * @offset: the requested offset 556 * @cm_flags: catmap flags, see _CM_F_* 557 * @gfp_flags: memory allocation flags 558 * 559 * Description: 560 * Iterate through the catmap looking for the node associated with @offset. 561 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node, 562 * one will be created and inserted into the catmap. If the _CM_F_WALK flag is 563 * set in @cm_flags and there is no associated node, the next highest node will 564 * be returned. Returns a pointer to the node on success, NULL on failure. 565 * 566 */ 567 static struct netlbl_lsm_catmap *_netlbl_catmap_getnode( 568 struct netlbl_lsm_catmap **catmap, 569 u32 offset, 570 unsigned int cm_flags, 571 gfp_t gfp_flags) 572 { 573 struct netlbl_lsm_catmap *iter = *catmap; 574 struct netlbl_lsm_catmap *prev = NULL; 575 576 if (iter == NULL) 577 goto catmap_getnode_alloc; 578 if (offset < iter->startbit) 579 goto catmap_getnode_walk; 580 while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { 581 prev = iter; 582 iter = iter->next; 583 } 584 if (iter == NULL || offset < iter->startbit) 585 goto catmap_getnode_walk; 586 587 return iter; 588 589 catmap_getnode_walk: 590 if (cm_flags & _CM_F_WALK) 591 return iter; 592 catmap_getnode_alloc: 593 if (!(cm_flags & _CM_F_ALLOC)) 594 return NULL; 595 596 iter = netlbl_catmap_alloc(gfp_flags); 597 if (iter == NULL) 598 return NULL; 599 iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1); 600 601 if (prev == NULL) { 602 iter->next = *catmap; 603 *catmap = iter; 604 } else { 605 iter->next = prev->next; 606 prev->next = iter; 607 } 608 609 return iter; 610 } 611 612 /** 613 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit 614 * @catmap: the category bitmap 615 * @offset: the offset to start searching at, in bits 616 * 617 * Description: 618 * This function walks a LSM secattr category bitmap starting at @offset and 619 * returns the spot of the first set bit or -ENOENT if no bits are set. 620 * 621 */ 622 int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset) 623 { 624 struct netlbl_lsm_catmap *iter = catmap; 625 u32 idx; 626 u32 bit; 627 NETLBL_CATMAP_MAPTYPE bitmap; 628 629 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0); 630 if (iter == NULL) 631 return -ENOENT; 632 if (offset > iter->startbit) { 633 offset -= iter->startbit; 634 idx = offset / NETLBL_CATMAP_MAPSIZE; 635 bit = offset % NETLBL_CATMAP_MAPSIZE; 636 } else { 637 idx = 0; 638 bit = 0; 639 } 640 bitmap = iter->bitmap[idx] >> bit; 641 642 for (;;) { 643 if (bitmap != 0) { 644 while ((bitmap & NETLBL_CATMAP_BIT) == 0) { 645 bitmap >>= 1; 646 bit++; 647 } 648 return iter->startbit + 649 (NETLBL_CATMAP_MAPSIZE * idx) + bit; 650 } 651 if (++idx >= NETLBL_CATMAP_MAPCNT) { 652 if (iter->next != NULL) { 653 iter = iter->next; 654 idx = 0; 655 } else 656 return -ENOENT; 657 } 658 bitmap = iter->bitmap[idx]; 659 bit = 0; 660 } 661 662 return -ENOENT; 663 } 664 EXPORT_SYMBOL(netlbl_catmap_walk); 665 666 /** 667 * netlbl_catmap_walkrng - Find the end of a string of set bits 668 * @catmap: the category bitmap 669 * @offset: the offset to start searching at, in bits 670 * 671 * Description: 672 * This function walks a LSM secattr category bitmap starting at @offset and 673 * returns the spot of the first cleared bit or -ENOENT if the offset is past 674 * the end of the bitmap. 675 * 676 */ 677 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset) 678 { 679 struct netlbl_lsm_catmap *iter; 680 struct netlbl_lsm_catmap *prev = NULL; 681 u32 idx; 682 u32 bit; 683 NETLBL_CATMAP_MAPTYPE bitmask; 684 NETLBL_CATMAP_MAPTYPE bitmap; 685 686 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0); 687 if (iter == NULL) 688 return -ENOENT; 689 if (offset > iter->startbit) { 690 offset -= iter->startbit; 691 idx = offset / NETLBL_CATMAP_MAPSIZE; 692 bit = offset % NETLBL_CATMAP_MAPSIZE; 693 } else { 694 idx = 0; 695 bit = 0; 696 } 697 bitmask = NETLBL_CATMAP_BIT << bit; 698 699 for (;;) { 700 bitmap = iter->bitmap[idx]; 701 while (bitmask != 0 && (bitmap & bitmask) != 0) { 702 bitmask <<= 1; 703 bit++; 704 } 705 706 if (prev && idx == 0 && bit == 0) 707 return prev->startbit + NETLBL_CATMAP_SIZE - 1; 708 else if (bitmask != 0) 709 return iter->startbit + 710 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1; 711 else if (++idx >= NETLBL_CATMAP_MAPCNT) { 712 if (iter->next == NULL) 713 return iter->startbit + NETLBL_CATMAP_SIZE - 1; 714 prev = iter; 715 iter = iter->next; 716 idx = 0; 717 } 718 bitmask = NETLBL_CATMAP_BIT; 719 bit = 0; 720 } 721 722 return -ENOENT; 723 } 724 725 /** 726 * netlbl_catmap_getlong - Export an unsigned long bitmap 727 * @catmap: pointer to the category bitmap 728 * @offset: pointer to the requested offset 729 * @bitmap: the exported bitmap 730 * 731 * Description: 732 * Export a bitmap with an offset greater than or equal to @offset and return 733 * it in @bitmap. The @offset must be aligned to an unsigned long and will be 734 * updated on return if different from what was requested; if the catmap is 735 * empty at the requested offset and beyond, the @offset is set to (u32)-1. 736 * Returns zero on sucess, negative values on failure. 737 * 738 */ 739 int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap, 740 u32 *offset, 741 unsigned long *bitmap) 742 { 743 struct netlbl_lsm_catmap *iter; 744 u32 off = *offset; 745 u32 idx; 746 747 /* only allow aligned offsets */ 748 if ((off & (BITS_PER_LONG - 1)) != 0) 749 return -EINVAL; 750 751 if (off < catmap->startbit) { 752 off = catmap->startbit; 753 *offset = off; 754 } 755 iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0); 756 if (iter == NULL) { 757 *offset = (u32)-1; 758 return 0; 759 } 760 761 if (off < iter->startbit) { 762 *offset = iter->startbit; 763 off = 0; 764 } else 765 off -= iter->startbit; 766 idx = off / NETLBL_CATMAP_MAPSIZE; 767 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE); 768 769 return 0; 770 } 771 772 /** 773 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap 774 * @catmap: pointer to the category bitmap 775 * @bit: the bit to set 776 * @flags: memory allocation flags 777 * 778 * Description: 779 * Set the bit specified by @bit in @catmap. Returns zero on success, 780 * negative values on failure. 781 * 782 */ 783 int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap, 784 u32 bit, 785 gfp_t flags) 786 { 787 struct netlbl_lsm_catmap *iter; 788 u32 idx; 789 790 iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags); 791 if (iter == NULL) 792 return -ENOMEM; 793 794 bit -= iter->startbit; 795 idx = bit / NETLBL_CATMAP_MAPSIZE; 796 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE); 797 798 return 0; 799 } 800 EXPORT_SYMBOL(netlbl_catmap_setbit); 801 802 /** 803 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap 804 * @catmap: pointer to the category bitmap 805 * @start: the starting bit 806 * @end: the last bit in the string 807 * @flags: memory allocation flags 808 * 809 * Description: 810 * Set a range of bits, starting at @start and ending with @end. Returns zero 811 * on success, negative values on failure. 812 * 813 */ 814 int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap, 815 u32 start, 816 u32 end, 817 gfp_t flags) 818 { 819 int rc = 0; 820 u32 spot = start; 821 822 while (rc == 0 && spot <= end) { 823 if (((spot & (BITS_PER_LONG - 1)) == 0) && 824 ((end - spot) > BITS_PER_LONG)) { 825 rc = netlbl_catmap_setlong(catmap, 826 spot, 827 (unsigned long)-1, 828 flags); 829 spot += BITS_PER_LONG; 830 } else 831 rc = netlbl_catmap_setbit(catmap, spot++, flags); 832 } 833 834 return rc; 835 } 836 837 /** 838 * netlbl_catmap_setlong - Import an unsigned long bitmap 839 * @catmap: pointer to the category bitmap 840 * @offset: offset to the start of the imported bitmap 841 * @bitmap: the bitmap to import 842 * @flags: memory allocation flags 843 * 844 * Description: 845 * Import the bitmap specified in @bitmap into @catmap, using the offset 846 * in @offset. The offset must be aligned to an unsigned long. Returns zero 847 * on success, negative values on failure. 848 * 849 */ 850 int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap, 851 u32 offset, 852 unsigned long bitmap, 853 gfp_t flags) 854 { 855 struct netlbl_lsm_catmap *iter; 856 u32 idx; 857 858 /* only allow aligned offsets */ 859 if ((offset & (BITS_PER_LONG - 1)) != 0) 860 return -EINVAL; 861 862 iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags); 863 if (iter == NULL) 864 return -ENOMEM; 865 866 offset -= iter->startbit; 867 idx = offset / NETLBL_CATMAP_MAPSIZE; 868 iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE); 869 870 return 0; 871 } 872 873 /* Bitmap functions 874 */ 875 876 /** 877 * netlbl_bitmap_walk - Walk a bitmap looking for a bit 878 * @bitmap: the bitmap 879 * @bitmap_len: length in bits 880 * @offset: starting offset 881 * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit 882 * 883 * Description: 884 * Starting at @offset, walk the bitmap from left to right until either the 885 * desired bit is found or we reach the end. Return the bit offset, -1 if 886 * not found, or -2 if error. 887 */ 888 int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len, 889 u32 offset, u8 state) 890 { 891 u32 bit_spot; 892 u32 byte_offset; 893 unsigned char bitmask; 894 unsigned char byte; 895 896 byte_offset = offset / 8; 897 byte = bitmap[byte_offset]; 898 bit_spot = offset; 899 bitmask = 0x80 >> (offset % 8); 900 901 while (bit_spot < bitmap_len) { 902 if ((state && (byte & bitmask) == bitmask) || 903 (state == 0 && (byte & bitmask) == 0)) 904 return bit_spot; 905 906 if (++bit_spot >= bitmap_len) 907 return -1; 908 bitmask >>= 1; 909 if (bitmask == 0) { 910 byte = bitmap[++byte_offset]; 911 bitmask = 0x80; 912 } 913 } 914 915 return -1; 916 } 917 EXPORT_SYMBOL(netlbl_bitmap_walk); 918 919 /** 920 * netlbl_bitmap_setbit - Sets a single bit in a bitmap 921 * @bitmap: the bitmap 922 * @bit: the bit 923 * @state: if non-zero, set the bit (1) else clear the bit (0) 924 * 925 * Description: 926 * Set a single bit in the bitmask. Returns zero on success, negative values 927 * on error. 928 */ 929 void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state) 930 { 931 u32 byte_spot; 932 u8 bitmask; 933 934 /* gcc always rounds to zero when doing integer division */ 935 byte_spot = bit / 8; 936 bitmask = 0x80 >> (bit % 8); 937 if (state) 938 bitmap[byte_spot] |= bitmask; 939 else 940 bitmap[byte_spot] &= ~bitmask; 941 } 942 EXPORT_SYMBOL(netlbl_bitmap_setbit); 943 944 /* 945 * LSM Functions 946 */ 947 948 /** 949 * netlbl_enabled - Determine if the NetLabel subsystem is enabled 950 * 951 * Description: 952 * The LSM can use this function to determine if it should use NetLabel 953 * security attributes in it's enforcement mechanism. Currently, NetLabel is 954 * considered to be enabled when it's configuration contains a valid setup for 955 * at least one labeled protocol (i.e. NetLabel can understand incoming 956 * labeled packets of at least one type); otherwise NetLabel is considered to 957 * be disabled. 958 * 959 */ 960 int netlbl_enabled(void) 961 { 962 /* At some point we probably want to expose this mechanism to the user 963 * as well so that admins can toggle NetLabel regardless of the 964 * configuration */ 965 return (atomic_read(&netlabel_mgmt_protocount) > 0); 966 } 967 968 /** 969 * netlbl_sock_setattr - Label a socket using the correct protocol 970 * @sk: the socket to label 971 * @family: protocol family 972 * @secattr: the security attributes 973 * 974 * Description: 975 * Attach the correct label to the given socket using the security attributes 976 * specified in @secattr. This function requires exclusive access to @sk, 977 * which means it either needs to be in the process of being created or locked. 978 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use 979 * network address selectors (can't blindly label the socket), and negative 980 * values on all other failures. 981 * 982 */ 983 int netlbl_sock_setattr(struct sock *sk, 984 u16 family, 985 const struct netlbl_lsm_secattr *secattr) 986 { 987 int ret_val; 988 struct netlbl_dom_map *dom_entry; 989 990 rcu_read_lock(); 991 dom_entry = netlbl_domhsh_getentry(secattr->domain, family); 992 if (dom_entry == NULL) { 993 ret_val = -ENOENT; 994 goto socket_setattr_return; 995 } 996 switch (family) { 997 case AF_INET: 998 switch (dom_entry->def.type) { 999 case NETLBL_NLTYPE_ADDRSELECT: 1000 ret_val = -EDESTADDRREQ; 1001 break; 1002 case NETLBL_NLTYPE_CIPSOV4: 1003 ret_val = cipso_v4_sock_setattr(sk, 1004 dom_entry->def.cipso, 1005 secattr); 1006 break; 1007 case NETLBL_NLTYPE_UNLABELED: 1008 ret_val = 0; 1009 break; 1010 default: 1011 ret_val = -ENOENT; 1012 } 1013 break; 1014 #if IS_ENABLED(CONFIG_IPV6) 1015 case AF_INET6: 1016 switch (dom_entry->def.type) { 1017 case NETLBL_NLTYPE_ADDRSELECT: 1018 ret_val = -EDESTADDRREQ; 1019 break; 1020 case NETLBL_NLTYPE_CALIPSO: 1021 ret_val = calipso_sock_setattr(sk, 1022 dom_entry->def.calipso, 1023 secattr); 1024 break; 1025 case NETLBL_NLTYPE_UNLABELED: 1026 ret_val = 0; 1027 break; 1028 default: 1029 ret_val = -ENOENT; 1030 } 1031 break; 1032 #endif /* IPv6 */ 1033 default: 1034 ret_val = -EPROTONOSUPPORT; 1035 } 1036 1037 socket_setattr_return: 1038 rcu_read_unlock(); 1039 return ret_val; 1040 } 1041 1042 /** 1043 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket 1044 * @sk: the socket 1045 * 1046 * Description: 1047 * Remove all the NetLabel labeling from @sk. The caller is responsible for 1048 * ensuring that @sk is locked. 1049 * 1050 */ 1051 void netlbl_sock_delattr(struct sock *sk) 1052 { 1053 switch (sk->sk_family) { 1054 case AF_INET: 1055 cipso_v4_sock_delattr(sk); 1056 break; 1057 #if IS_ENABLED(CONFIG_IPV6) 1058 case AF_INET6: 1059 calipso_sock_delattr(sk); 1060 break; 1061 #endif /* IPv6 */ 1062 } 1063 } 1064 1065 /** 1066 * netlbl_sock_getattr - Determine the security attributes of a sock 1067 * @sk: the sock 1068 * @secattr: the security attributes 1069 * 1070 * Description: 1071 * Examines the given sock to see if any NetLabel style labeling has been 1072 * applied to the sock, if so it parses the socket label and returns the 1073 * security attributes in @secattr. Returns zero on success, negative values 1074 * on failure. 1075 * 1076 */ 1077 int netlbl_sock_getattr(struct sock *sk, 1078 struct netlbl_lsm_secattr *secattr) 1079 { 1080 int ret_val; 1081 1082 switch (sk->sk_family) { 1083 case AF_INET: 1084 ret_val = cipso_v4_sock_getattr(sk, secattr); 1085 break; 1086 #if IS_ENABLED(CONFIG_IPV6) 1087 case AF_INET6: 1088 ret_val = calipso_sock_getattr(sk, secattr); 1089 break; 1090 #endif /* IPv6 */ 1091 default: 1092 ret_val = -EPROTONOSUPPORT; 1093 } 1094 1095 return ret_val; 1096 } 1097 1098 /** 1099 * netlbl_conn_setattr - Label a connected socket using the correct protocol 1100 * @sk: the socket to label 1101 * @addr: the destination address 1102 * @secattr: the security attributes 1103 * 1104 * Description: 1105 * Attach the correct label to the given connected socket using the security 1106 * attributes specified in @secattr. The caller is responsible for ensuring 1107 * that @sk is locked. Returns zero on success, negative values on failure. 1108 * 1109 */ 1110 int netlbl_conn_setattr(struct sock *sk, 1111 struct sockaddr *addr, 1112 const struct netlbl_lsm_secattr *secattr) 1113 { 1114 int ret_val; 1115 struct sockaddr_in *addr4; 1116 #if IS_ENABLED(CONFIG_IPV6) 1117 struct sockaddr_in6 *addr6; 1118 #endif 1119 struct netlbl_dommap_def *entry; 1120 1121 rcu_read_lock(); 1122 switch (addr->sa_family) { 1123 case AF_INET: 1124 addr4 = (struct sockaddr_in *)addr; 1125 entry = netlbl_domhsh_getentry_af4(secattr->domain, 1126 addr4->sin_addr.s_addr); 1127 if (entry == NULL) { 1128 ret_val = -ENOENT; 1129 goto conn_setattr_return; 1130 } 1131 switch (entry->type) { 1132 case NETLBL_NLTYPE_CIPSOV4: 1133 ret_val = cipso_v4_sock_setattr(sk, 1134 entry->cipso, secattr); 1135 break; 1136 case NETLBL_NLTYPE_UNLABELED: 1137 /* just delete the protocols we support for right now 1138 * but we could remove other protocols if needed */ 1139 netlbl_sock_delattr(sk); 1140 ret_val = 0; 1141 break; 1142 default: 1143 ret_val = -ENOENT; 1144 } 1145 break; 1146 #if IS_ENABLED(CONFIG_IPV6) 1147 case AF_INET6: 1148 addr6 = (struct sockaddr_in6 *)addr; 1149 entry = netlbl_domhsh_getentry_af6(secattr->domain, 1150 &addr6->sin6_addr); 1151 if (entry == NULL) { 1152 ret_val = -ENOENT; 1153 goto conn_setattr_return; 1154 } 1155 switch (entry->type) { 1156 case NETLBL_NLTYPE_CALIPSO: 1157 ret_val = calipso_sock_setattr(sk, 1158 entry->calipso, secattr); 1159 break; 1160 case NETLBL_NLTYPE_UNLABELED: 1161 /* just delete the protocols we support for right now 1162 * but we could remove other protocols if needed */ 1163 netlbl_sock_delattr(sk); 1164 ret_val = 0; 1165 break; 1166 default: 1167 ret_val = -ENOENT; 1168 } 1169 break; 1170 #endif /* IPv6 */ 1171 default: 1172 ret_val = -EPROTONOSUPPORT; 1173 } 1174 1175 conn_setattr_return: 1176 rcu_read_unlock(); 1177 return ret_val; 1178 } 1179 1180 /** 1181 * netlbl_req_setattr - Label a request socket using the correct protocol 1182 * @req: the request socket to label 1183 * @secattr: the security attributes 1184 * 1185 * Description: 1186 * Attach the correct label to the given socket using the security attributes 1187 * specified in @secattr. Returns zero on success, negative values on failure. 1188 * 1189 */ 1190 int netlbl_req_setattr(struct request_sock *req, 1191 const struct netlbl_lsm_secattr *secattr) 1192 { 1193 int ret_val; 1194 struct netlbl_dommap_def *entry; 1195 struct inet_request_sock *ireq = inet_rsk(req); 1196 1197 rcu_read_lock(); 1198 switch (req->rsk_ops->family) { 1199 case AF_INET: 1200 entry = netlbl_domhsh_getentry_af4(secattr->domain, 1201 ireq->ir_rmt_addr); 1202 if (entry == NULL) { 1203 ret_val = -ENOENT; 1204 goto req_setattr_return; 1205 } 1206 switch (entry->type) { 1207 case NETLBL_NLTYPE_CIPSOV4: 1208 ret_val = cipso_v4_req_setattr(req, 1209 entry->cipso, secattr); 1210 break; 1211 case NETLBL_NLTYPE_UNLABELED: 1212 netlbl_req_delattr(req); 1213 ret_val = 0; 1214 break; 1215 default: 1216 ret_val = -ENOENT; 1217 } 1218 break; 1219 #if IS_ENABLED(CONFIG_IPV6) 1220 case AF_INET6: 1221 entry = netlbl_domhsh_getentry_af6(secattr->domain, 1222 &ireq->ir_v6_rmt_addr); 1223 if (entry == NULL) { 1224 ret_val = -ENOENT; 1225 goto req_setattr_return; 1226 } 1227 switch (entry->type) { 1228 case NETLBL_NLTYPE_CALIPSO: 1229 ret_val = calipso_req_setattr(req, 1230 entry->calipso, secattr); 1231 break; 1232 case NETLBL_NLTYPE_UNLABELED: 1233 netlbl_req_delattr(req); 1234 ret_val = 0; 1235 break; 1236 default: 1237 ret_val = -ENOENT; 1238 } 1239 break; 1240 #endif /* IPv6 */ 1241 default: 1242 ret_val = -EPROTONOSUPPORT; 1243 } 1244 1245 req_setattr_return: 1246 rcu_read_unlock(); 1247 return ret_val; 1248 } 1249 1250 /** 1251 * netlbl_req_delattr - Delete all the NetLabel labels on a socket 1252 * @req: the socket 1253 * 1254 * Description: 1255 * Remove all the NetLabel labeling from @req. 1256 * 1257 */ 1258 void netlbl_req_delattr(struct request_sock *req) 1259 { 1260 switch (req->rsk_ops->family) { 1261 case AF_INET: 1262 cipso_v4_req_delattr(req); 1263 break; 1264 #if IS_ENABLED(CONFIG_IPV6) 1265 case AF_INET6: 1266 calipso_req_delattr(req); 1267 break; 1268 #endif /* IPv6 */ 1269 } 1270 } 1271 1272 /** 1273 * netlbl_skbuff_setattr - Label a packet using the correct protocol 1274 * @skb: the packet 1275 * @family: protocol family 1276 * @secattr: the security attributes 1277 * 1278 * Description: 1279 * Attach the correct label to the given packet using the security attributes 1280 * specified in @secattr. Returns zero on success, negative values on failure. 1281 * 1282 */ 1283 int netlbl_skbuff_setattr(struct sk_buff *skb, 1284 u16 family, 1285 const struct netlbl_lsm_secattr *secattr) 1286 { 1287 int ret_val; 1288 struct iphdr *hdr4; 1289 #if IS_ENABLED(CONFIG_IPV6) 1290 struct ipv6hdr *hdr6; 1291 #endif 1292 struct netlbl_dommap_def *entry; 1293 1294 rcu_read_lock(); 1295 switch (family) { 1296 case AF_INET: 1297 hdr4 = ip_hdr(skb); 1298 entry = netlbl_domhsh_getentry_af4(secattr->domain, 1299 hdr4->daddr); 1300 if (entry == NULL) { 1301 ret_val = -ENOENT; 1302 goto skbuff_setattr_return; 1303 } 1304 switch (entry->type) { 1305 case NETLBL_NLTYPE_CIPSOV4: 1306 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso, 1307 secattr); 1308 break; 1309 case NETLBL_NLTYPE_UNLABELED: 1310 /* just delete the protocols we support for right now 1311 * but we could remove other protocols if needed */ 1312 ret_val = cipso_v4_skbuff_delattr(skb); 1313 break; 1314 default: 1315 ret_val = -ENOENT; 1316 } 1317 break; 1318 #if IS_ENABLED(CONFIG_IPV6) 1319 case AF_INET6: 1320 hdr6 = ipv6_hdr(skb); 1321 entry = netlbl_domhsh_getentry_af6(secattr->domain, 1322 &hdr6->daddr); 1323 if (entry == NULL) { 1324 ret_val = -ENOENT; 1325 goto skbuff_setattr_return; 1326 } 1327 switch (entry->type) { 1328 case NETLBL_NLTYPE_CALIPSO: 1329 ret_val = calipso_skbuff_setattr(skb, entry->calipso, 1330 secattr); 1331 break; 1332 case NETLBL_NLTYPE_UNLABELED: 1333 /* just delete the protocols we support for right now 1334 * but we could remove other protocols if needed */ 1335 ret_val = calipso_skbuff_delattr(skb); 1336 break; 1337 default: 1338 ret_val = -ENOENT; 1339 } 1340 break; 1341 #endif /* IPv6 */ 1342 default: 1343 ret_val = -EPROTONOSUPPORT; 1344 } 1345 1346 skbuff_setattr_return: 1347 rcu_read_unlock(); 1348 return ret_val; 1349 } 1350 1351 /** 1352 * netlbl_skbuff_getattr - Determine the security attributes of a packet 1353 * @skb: the packet 1354 * @family: protocol family 1355 * @secattr: the security attributes 1356 * 1357 * Description: 1358 * Examines the given packet to see if a recognized form of packet labeling 1359 * is present, if so it parses the packet label and returns the security 1360 * attributes in @secattr. Returns zero on success, negative values on 1361 * failure. 1362 * 1363 */ 1364 int netlbl_skbuff_getattr(const struct sk_buff *skb, 1365 u16 family, 1366 struct netlbl_lsm_secattr *secattr) 1367 { 1368 unsigned char *ptr; 1369 1370 switch (family) { 1371 case AF_INET: 1372 ptr = cipso_v4_optptr(skb); 1373 if (ptr && cipso_v4_getattr(ptr, secattr) == 0) 1374 return 0; 1375 break; 1376 #if IS_ENABLED(CONFIG_IPV6) 1377 case AF_INET6: 1378 ptr = calipso_optptr(skb); 1379 if (ptr && calipso_getattr(ptr, secattr) == 0) 1380 return 0; 1381 break; 1382 #endif /* IPv6 */ 1383 } 1384 1385 return netlbl_unlabel_getattr(skb, family, secattr); 1386 } 1387 1388 /** 1389 * netlbl_skbuff_err - Handle a LSM error on a sk_buff 1390 * @skb: the packet 1391 * @family: the family 1392 * @error: the error code 1393 * @gateway: true if host is acting as a gateway, false otherwise 1394 * 1395 * Description: 1396 * Deal with a LSM problem when handling the packet in @skb, typically this is 1397 * a permission denied problem (-EACCES). The correct action is determined 1398 * according to the packet's labeling protocol. 1399 * 1400 */ 1401 void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway) 1402 { 1403 switch (family) { 1404 case AF_INET: 1405 if (cipso_v4_optptr(skb)) 1406 cipso_v4_error(skb, error, gateway); 1407 break; 1408 } 1409 } 1410 1411 /** 1412 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches 1413 * 1414 * Description: 1415 * For all of the NetLabel protocols that support some form of label mapping 1416 * cache, invalidate the cache. Returns zero on success, negative values on 1417 * error. 1418 * 1419 */ 1420 void netlbl_cache_invalidate(void) 1421 { 1422 cipso_v4_cache_invalidate(); 1423 #if IS_ENABLED(CONFIG_IPV6) 1424 calipso_cache_invalidate(); 1425 #endif /* IPv6 */ 1426 } 1427 1428 /** 1429 * netlbl_cache_add - Add an entry to a NetLabel protocol cache 1430 * @skb: the packet 1431 * @family: the family 1432 * @secattr: the packet's security attributes 1433 * 1434 * Description: 1435 * Add the LSM security attributes for the given packet to the underlying 1436 * NetLabel protocol's label mapping cache. Returns zero on success, negative 1437 * values on error. 1438 * 1439 */ 1440 int netlbl_cache_add(const struct sk_buff *skb, u16 family, 1441 const struct netlbl_lsm_secattr *secattr) 1442 { 1443 unsigned char *ptr; 1444 1445 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0) 1446 return -ENOMSG; 1447 1448 switch (family) { 1449 case AF_INET: 1450 ptr = cipso_v4_optptr(skb); 1451 if (ptr) 1452 return cipso_v4_cache_add(ptr, secattr); 1453 break; 1454 #if IS_ENABLED(CONFIG_IPV6) 1455 case AF_INET6: 1456 ptr = calipso_optptr(skb); 1457 if (ptr) 1458 return calipso_cache_add(ptr, secattr); 1459 break; 1460 #endif /* IPv6 */ 1461 } 1462 return -ENOMSG; 1463 } 1464 1465 /* 1466 * Protocol Engine Functions 1467 */ 1468 1469 /** 1470 * netlbl_audit_start - Start an audit message 1471 * @type: audit message type 1472 * @audit_info: NetLabel audit information 1473 * 1474 * Description: 1475 * Start an audit message using the type specified in @type and fill the audit 1476 * message with some fields common to all NetLabel audit messages. This 1477 * function should only be used by protocol engines, not LSMs. Returns a 1478 * pointer to the audit buffer on success, NULL on failure. 1479 * 1480 */ 1481 struct audit_buffer *netlbl_audit_start(int type, 1482 struct netlbl_audit *audit_info) 1483 { 1484 return netlbl_audit_start_common(type, audit_info); 1485 } 1486 EXPORT_SYMBOL(netlbl_audit_start); 1487 1488 /* 1489 * Setup Functions 1490 */ 1491 1492 /** 1493 * netlbl_init - Initialize NetLabel 1494 * 1495 * Description: 1496 * Perform the required NetLabel initialization before first use. 1497 * 1498 */ 1499 static int __init netlbl_init(void) 1500 { 1501 int ret_val; 1502 1503 printk(KERN_INFO "NetLabel: Initializing\n"); 1504 printk(KERN_INFO "NetLabel: domain hash size = %u\n", 1505 (1 << NETLBL_DOMHSH_BITSIZE)); 1506 printk(KERN_INFO "NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n"); 1507 1508 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE); 1509 if (ret_val != 0) 1510 goto init_failure; 1511 1512 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE); 1513 if (ret_val != 0) 1514 goto init_failure; 1515 1516 ret_val = netlbl_netlink_init(); 1517 if (ret_val != 0) 1518 goto init_failure; 1519 1520 ret_val = netlbl_unlabel_defconf(); 1521 if (ret_val != 0) 1522 goto init_failure; 1523 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n"); 1524 1525 return 0; 1526 1527 init_failure: 1528 panic("NetLabel: failed to initialize properly (%d)\n", ret_val); 1529 } 1530 1531 subsys_initcall(netlbl_init); 1532