1/* 2 * NetLabel Unlabeled Support 3 * 4 * This file defines functions for dealing with unlabeled packets for the 5 * NetLabel system. The NetLabel system manages static and dynamic label 6 * mappings for network protocols such 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/types.h> 31#include <linux/rcupdate.h> 32#include <linux/list.h> 33#include <linux/spinlock.h> 34#include <linux/socket.h> 35#include <linux/string.h> 36#include <linux/skbuff.h> 37#include <linux/audit.h> 38#include <linux/in.h> 39#include <linux/in6.h> 40#include <linux/ip.h> 41#include <linux/ipv6.h> 42#include <linux/notifier.h> 43#include <linux/netdevice.h> 44#include <linux/security.h> 45#include <linux/slab.h> 46#include <net/sock.h> 47#include <net/netlink.h> 48#include <net/genetlink.h> 49#include <net/ip.h> 50#include <net/ipv6.h> 51#include <net/net_namespace.h> 52#include <net/netlabel.h> 53#include <asm/bug.h> 54#include <linux/atomic.h> 55 56#include "netlabel_user.h" 57#include "netlabel_addrlist.h" 58#include "netlabel_domainhash.h" 59#include "netlabel_unlabeled.h" 60#include "netlabel_mgmt.h" 61 62/* NOTE: at present we always use init's network namespace since we don't 63 * presently support different namespaces even though the majority of 64 * the functions in this file are "namespace safe" */ 65 66/* The unlabeled connection hash table which we use to map network interfaces 67 * and addresses of unlabeled packets to a user specified secid value for the 68 * LSM. The hash table is used to lookup the network interface entry 69 * (struct netlbl_unlhsh_iface) and then the interface entry is used to 70 * lookup an IP address match from an ordered list. If a network interface 71 * match can not be found in the hash table then the default entry 72 * (netlbl_unlhsh_def) is used. The IP address entry list 73 * (struct netlbl_unlhsh_addr) is ordered such that the entries with a 74 * larger netmask come first. 75 */ 76struct netlbl_unlhsh_tbl { 77 struct list_head *tbl; 78 u32 size; 79}; 80#define netlbl_unlhsh_addr4_entry(iter) \ 81 container_of(iter, struct netlbl_unlhsh_addr4, list) 82struct netlbl_unlhsh_addr4 { 83 u32 secid; 84 85 struct netlbl_af4list list; 86 struct rcu_head rcu; 87}; 88#define netlbl_unlhsh_addr6_entry(iter) \ 89 container_of(iter, struct netlbl_unlhsh_addr6, list) 90struct netlbl_unlhsh_addr6 { 91 u32 secid; 92 93 struct netlbl_af6list list; 94 struct rcu_head rcu; 95}; 96struct netlbl_unlhsh_iface { 97 int ifindex; 98 struct list_head addr4_list; 99 struct list_head addr6_list; 100 101 u32 valid; 102 struct list_head list; 103 struct rcu_head rcu; 104}; 105 106/* Argument struct for netlbl_unlhsh_walk() */ 107struct netlbl_unlhsh_walk_arg { 108 struct netlink_callback *nl_cb; 109 struct sk_buff *skb; 110 u32 seq; 111}; 112 113/* Unlabeled connection hash table */ 114/* updates should be so rare that having one spinlock for the entire 115 * hash table should be okay */ 116static DEFINE_SPINLOCK(netlbl_unlhsh_lock); 117#define netlbl_unlhsh_rcu_deref(p) \ 118 rcu_dereference_check(p, lockdep_is_held(&netlbl_unlhsh_lock)) 119static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL; 120static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL; 121 122/* Accept unlabeled packets flag */ 123static u8 netlabel_unlabel_acceptflg = 0; 124 125/* NetLabel Generic NETLINK unlabeled family */ 126static struct genl_family netlbl_unlabel_gnl_family = { 127 .id = GENL_ID_GENERATE, 128 .hdrsize = 0, 129 .name = NETLBL_NLTYPE_UNLABELED_NAME, 130 .version = NETLBL_PROTO_VERSION, 131 .maxattr = NLBL_UNLABEL_A_MAX, 132}; 133 134/* NetLabel Netlink attribute policy */ 135static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = { 136 [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 }, 137 [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY, 138 .len = sizeof(struct in6_addr) }, 139 [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY, 140 .len = sizeof(struct in6_addr) }, 141 [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY, 142 .len = sizeof(struct in_addr) }, 143 [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY, 144 .len = sizeof(struct in_addr) }, 145 [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING, 146 .len = IFNAMSIZ - 1 }, 147 [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY } 148}; 149 150/* 151 * Unlabeled Connection Hash Table Functions 152 */ 153 154/** 155 * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table 156 * @entry: the entry's RCU field 157 * 158 * Description: 159 * This function is designed to be used as a callback to the call_rcu() 160 * function so that memory allocated to a hash table interface entry can be 161 * released safely. It is important to note that this function does not free 162 * the IPv4 and IPv6 address lists contained as part of an interface entry. It 163 * is up to the rest of the code to make sure an interface entry is only freed 164 * once it's address lists are empty. 165 * 166 */ 167static void netlbl_unlhsh_free_iface(struct rcu_head *entry) 168{ 169 struct netlbl_unlhsh_iface *iface; 170 struct netlbl_af4list *iter4; 171 struct netlbl_af4list *tmp4; 172#if IS_ENABLED(CONFIG_IPV6) 173 struct netlbl_af6list *iter6; 174 struct netlbl_af6list *tmp6; 175#endif /* IPv6 */ 176 177 iface = container_of(entry, struct netlbl_unlhsh_iface, rcu); 178 179 /* no need for locks here since we are the only one with access to this 180 * structure */ 181 182 netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) { 183 netlbl_af4list_remove_entry(iter4); 184 kfree(netlbl_unlhsh_addr4_entry(iter4)); 185 } 186#if IS_ENABLED(CONFIG_IPV6) 187 netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) { 188 netlbl_af6list_remove_entry(iter6); 189 kfree(netlbl_unlhsh_addr6_entry(iter6)); 190 } 191#endif /* IPv6 */ 192 kfree(iface); 193} 194 195/** 196 * netlbl_unlhsh_hash - Hashing function for the hash table 197 * @ifindex: the network interface/device to hash 198 * 199 * Description: 200 * This is the hashing function for the unlabeled hash table, it returns the 201 * bucket number for the given device/interface. The caller is responsible for 202 * ensuring that the hash table is protected with either a RCU read lock or 203 * the hash table lock. 204 * 205 */ 206static u32 netlbl_unlhsh_hash(int ifindex) 207{ 208 return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1); 209} 210 211/** 212 * netlbl_unlhsh_search_iface - Search for a matching interface entry 213 * @ifindex: the network interface 214 * 215 * Description: 216 * Searches the unlabeled connection hash table and returns a pointer to the 217 * interface entry which matches @ifindex, otherwise NULL is returned. The 218 * caller is responsible for ensuring that the hash table is protected with 219 * either a RCU read lock or the hash table lock. 220 * 221 */ 222static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex) 223{ 224 u32 bkt; 225 struct list_head *bkt_list; 226 struct netlbl_unlhsh_iface *iter; 227 228 bkt = netlbl_unlhsh_hash(ifindex); 229 bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]; 230 list_for_each_entry_rcu(iter, bkt_list, list) 231 if (iter->valid && iter->ifindex == ifindex) 232 return iter; 233 234 return NULL; 235} 236 237/** 238 * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table 239 * @iface: the associated interface entry 240 * @addr: IPv4 address in network byte order 241 * @mask: IPv4 address mask in network byte order 242 * @secid: LSM secid value for entry 243 * 244 * Description: 245 * Add a new address entry into the unlabeled connection hash table using the 246 * interface entry specified by @iface. On success zero is returned, otherwise 247 * a negative value is returned. 248 * 249 */ 250static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface, 251 const struct in_addr *addr, 252 const struct in_addr *mask, 253 u32 secid) 254{ 255 int ret_val; 256 struct netlbl_unlhsh_addr4 *entry; 257 258 entry = kzalloc(sizeof(*entry), GFP_ATOMIC); 259 if (entry == NULL) 260 return -ENOMEM; 261 262 entry->list.addr = addr->s_addr & mask->s_addr; 263 entry->list.mask = mask->s_addr; 264 entry->list.valid = 1; 265 entry->secid = secid; 266 267 spin_lock(&netlbl_unlhsh_lock); 268 ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list); 269 spin_unlock(&netlbl_unlhsh_lock); 270 271 if (ret_val != 0) 272 kfree(entry); 273 return ret_val; 274} 275 276#if IS_ENABLED(CONFIG_IPV6) 277/** 278 * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table 279 * @iface: the associated interface entry 280 * @addr: IPv6 address in network byte order 281 * @mask: IPv6 address mask in network byte order 282 * @secid: LSM secid value for entry 283 * 284 * Description: 285 * Add a new address entry into the unlabeled connection hash table using the 286 * interface entry specified by @iface. On success zero is returned, otherwise 287 * a negative value is returned. 288 * 289 */ 290static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface, 291 const struct in6_addr *addr, 292 const struct in6_addr *mask, 293 u32 secid) 294{ 295 int ret_val; 296 struct netlbl_unlhsh_addr6 *entry; 297 298 entry = kzalloc(sizeof(*entry), GFP_ATOMIC); 299 if (entry == NULL) 300 return -ENOMEM; 301 302 entry->list.addr = *addr; 303 entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; 304 entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; 305 entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2]; 306 entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3]; 307 entry->list.mask = *mask; 308 entry->list.valid = 1; 309 entry->secid = secid; 310 311 spin_lock(&netlbl_unlhsh_lock); 312 ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list); 313 spin_unlock(&netlbl_unlhsh_lock); 314 315 if (ret_val != 0) 316 kfree(entry); 317 return 0; 318} 319#endif /* IPv6 */ 320 321/** 322 * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table 323 * @ifindex: network interface 324 * 325 * Description: 326 * Add a new, empty, interface entry into the unlabeled connection hash table. 327 * On success a pointer to the new interface entry is returned, on failure NULL 328 * is returned. 329 * 330 */ 331static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex) 332{ 333 u32 bkt; 334 struct netlbl_unlhsh_iface *iface; 335 336 iface = kzalloc(sizeof(*iface), GFP_ATOMIC); 337 if (iface == NULL) 338 return NULL; 339 340 iface->ifindex = ifindex; 341 INIT_LIST_HEAD(&iface->addr4_list); 342 INIT_LIST_HEAD(&iface->addr6_list); 343 iface->valid = 1; 344 345 spin_lock(&netlbl_unlhsh_lock); 346 if (ifindex > 0) { 347 bkt = netlbl_unlhsh_hash(ifindex); 348 if (netlbl_unlhsh_search_iface(ifindex) != NULL) 349 goto add_iface_failure; 350 list_add_tail_rcu(&iface->list, 351 &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]); 352 } else { 353 INIT_LIST_HEAD(&iface->list); 354 if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL) 355 goto add_iface_failure; 356 rcu_assign_pointer(netlbl_unlhsh_def, iface); 357 } 358 spin_unlock(&netlbl_unlhsh_lock); 359 360 return iface; 361 362add_iface_failure: 363 spin_unlock(&netlbl_unlhsh_lock); 364 kfree(iface); 365 return NULL; 366} 367 368/** 369 * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table 370 * @net: network namespace 371 * @dev_name: interface name 372 * @addr: IP address in network byte order 373 * @mask: address mask in network byte order 374 * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) 375 * @secid: LSM secid value for the entry 376 * @audit_info: NetLabel audit information 377 * 378 * Description: 379 * Adds a new entry to the unlabeled connection hash table. Returns zero on 380 * success, negative values on failure. 381 * 382 */ 383int netlbl_unlhsh_add(struct net *net, 384 const char *dev_name, 385 const void *addr, 386 const void *mask, 387 u32 addr_len, 388 u32 secid, 389 struct netlbl_audit *audit_info) 390{ 391 int ret_val; 392 int ifindex; 393 struct net_device *dev; 394 struct netlbl_unlhsh_iface *iface; 395 struct audit_buffer *audit_buf = NULL; 396 char *secctx = NULL; 397 u32 secctx_len; 398 399 if (addr_len != sizeof(struct in_addr) && 400 addr_len != sizeof(struct in6_addr)) 401 return -EINVAL; 402 403 rcu_read_lock(); 404 if (dev_name != NULL) { 405 dev = dev_get_by_name_rcu(net, dev_name); 406 if (dev == NULL) { 407 ret_val = -ENODEV; 408 goto unlhsh_add_return; 409 } 410 ifindex = dev->ifindex; 411 iface = netlbl_unlhsh_search_iface(ifindex); 412 } else { 413 ifindex = 0; 414 iface = rcu_dereference(netlbl_unlhsh_def); 415 } 416 if (iface == NULL) { 417 iface = netlbl_unlhsh_add_iface(ifindex); 418 if (iface == NULL) { 419 ret_val = -ENOMEM; 420 goto unlhsh_add_return; 421 } 422 } 423 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD, 424 audit_info); 425 switch (addr_len) { 426 case sizeof(struct in_addr): { 427 const struct in_addr *addr4 = addr; 428 const struct in_addr *mask4 = mask; 429 430 ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid); 431 if (audit_buf != NULL) 432 netlbl_af4list_audit_addr(audit_buf, 1, 433 dev_name, 434 addr4->s_addr, 435 mask4->s_addr); 436 break; 437 } 438#if IS_ENABLED(CONFIG_IPV6) 439 case sizeof(struct in6_addr): { 440 const struct in6_addr *addr6 = addr; 441 const struct in6_addr *mask6 = mask; 442 443 ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid); 444 if (audit_buf != NULL) 445 netlbl_af6list_audit_addr(audit_buf, 1, 446 dev_name, 447 addr6, mask6); 448 break; 449 } 450#endif /* IPv6 */ 451 default: 452 ret_val = -EINVAL; 453 } 454 if (ret_val == 0) 455 atomic_inc(&netlabel_mgmt_protocount); 456 457unlhsh_add_return: 458 rcu_read_unlock(); 459 if (audit_buf != NULL) { 460 if (security_secid_to_secctx(secid, 461 &secctx, 462 &secctx_len) == 0) { 463 audit_log_format(audit_buf, " sec_obj=%s", secctx); 464 security_release_secctx(secctx, secctx_len); 465 } 466 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); 467 audit_log_end(audit_buf); 468 } 469 return ret_val; 470} 471 472/** 473 * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry 474 * @net: network namespace 475 * @iface: interface entry 476 * @addr: IP address 477 * @mask: IP address mask 478 * @audit_info: NetLabel audit information 479 * 480 * Description: 481 * Remove an IP address entry from the unlabeled connection hash table. 482 * Returns zero on success, negative values on failure. 483 * 484 */ 485static int netlbl_unlhsh_remove_addr4(struct net *net, 486 struct netlbl_unlhsh_iface *iface, 487 const struct in_addr *addr, 488 const struct in_addr *mask, 489 struct netlbl_audit *audit_info) 490{ 491 struct netlbl_af4list *list_entry; 492 struct netlbl_unlhsh_addr4 *entry; 493 struct audit_buffer *audit_buf; 494 struct net_device *dev; 495 char *secctx; 496 u32 secctx_len; 497 498 spin_lock(&netlbl_unlhsh_lock); 499 list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr, 500 &iface->addr4_list); 501 spin_unlock(&netlbl_unlhsh_lock); 502 if (list_entry != NULL) 503 entry = netlbl_unlhsh_addr4_entry(list_entry); 504 else 505 entry = NULL; 506 507 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, 508 audit_info); 509 if (audit_buf != NULL) { 510 dev = dev_get_by_index(net, iface->ifindex); 511 netlbl_af4list_audit_addr(audit_buf, 1, 512 (dev != NULL ? dev->name : NULL), 513 addr->s_addr, mask->s_addr); 514 if (dev != NULL) 515 dev_put(dev); 516 if (entry != NULL && 517 security_secid_to_secctx(entry->secid, 518 &secctx, &secctx_len) == 0) { 519 audit_log_format(audit_buf, " sec_obj=%s", secctx); 520 security_release_secctx(secctx, secctx_len); 521 } 522 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); 523 audit_log_end(audit_buf); 524 } 525 526 if (entry == NULL) 527 return -ENOENT; 528 529 kfree_rcu(entry, rcu); 530 return 0; 531} 532 533#if IS_ENABLED(CONFIG_IPV6) 534/** 535 * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry 536 * @net: network namespace 537 * @iface: interface entry 538 * @addr: IP address 539 * @mask: IP address mask 540 * @audit_info: NetLabel audit information 541 * 542 * Description: 543 * Remove an IP address entry from the unlabeled connection hash table. 544 * Returns zero on success, negative values on failure. 545 * 546 */ 547static int netlbl_unlhsh_remove_addr6(struct net *net, 548 struct netlbl_unlhsh_iface *iface, 549 const struct in6_addr *addr, 550 const struct in6_addr *mask, 551 struct netlbl_audit *audit_info) 552{ 553 struct netlbl_af6list *list_entry; 554 struct netlbl_unlhsh_addr6 *entry; 555 struct audit_buffer *audit_buf; 556 struct net_device *dev; 557 char *secctx; 558 u32 secctx_len; 559 560 spin_lock(&netlbl_unlhsh_lock); 561 list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list); 562 spin_unlock(&netlbl_unlhsh_lock); 563 if (list_entry != NULL) 564 entry = netlbl_unlhsh_addr6_entry(list_entry); 565 else 566 entry = NULL; 567 568 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, 569 audit_info); 570 if (audit_buf != NULL) { 571 dev = dev_get_by_index(net, iface->ifindex); 572 netlbl_af6list_audit_addr(audit_buf, 1, 573 (dev != NULL ? dev->name : NULL), 574 addr, mask); 575 if (dev != NULL) 576 dev_put(dev); 577 if (entry != NULL && 578 security_secid_to_secctx(entry->secid, 579 &secctx, &secctx_len) == 0) { 580 audit_log_format(audit_buf, " sec_obj=%s", secctx); 581 security_release_secctx(secctx, secctx_len); 582 } 583 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); 584 audit_log_end(audit_buf); 585 } 586 587 if (entry == NULL) 588 return -ENOENT; 589 590 kfree_rcu(entry, rcu); 591 return 0; 592} 593#endif /* IPv6 */ 594 595/** 596 * netlbl_unlhsh_condremove_iface - Remove an interface entry 597 * @iface: the interface entry 598 * 599 * Description: 600 * Remove an interface entry from the unlabeled connection hash table if it is 601 * empty. An interface entry is considered to be empty if there are no 602 * address entries assigned to it. 603 * 604 */ 605static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface) 606{ 607 struct netlbl_af4list *iter4; 608#if IS_ENABLED(CONFIG_IPV6) 609 struct netlbl_af6list *iter6; 610#endif /* IPv6 */ 611 612 spin_lock(&netlbl_unlhsh_lock); 613 netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list) 614 goto unlhsh_condremove_failure; 615#if IS_ENABLED(CONFIG_IPV6) 616 netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list) 617 goto unlhsh_condremove_failure; 618#endif /* IPv6 */ 619 iface->valid = 0; 620 if (iface->ifindex > 0) 621 list_del_rcu(&iface->list); 622 else 623 RCU_INIT_POINTER(netlbl_unlhsh_def, NULL); 624 spin_unlock(&netlbl_unlhsh_lock); 625 626 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); 627 return; 628 629unlhsh_condremove_failure: 630 spin_unlock(&netlbl_unlhsh_lock); 631} 632 633/** 634 * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table 635 * @net: network namespace 636 * @dev_name: interface name 637 * @addr: IP address in network byte order 638 * @mask: address mask in network byte order 639 * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) 640 * @audit_info: NetLabel audit information 641 * 642 * Description: 643 * Removes and existing entry from the unlabeled connection hash table. 644 * Returns zero on success, negative values on failure. 645 * 646 */ 647int netlbl_unlhsh_remove(struct net *net, 648 const char *dev_name, 649 const void *addr, 650 const void *mask, 651 u32 addr_len, 652 struct netlbl_audit *audit_info) 653{ 654 int ret_val; 655 struct net_device *dev; 656 struct netlbl_unlhsh_iface *iface; 657 658 if (addr_len != sizeof(struct in_addr) && 659 addr_len != sizeof(struct in6_addr)) 660 return -EINVAL; 661 662 rcu_read_lock(); 663 if (dev_name != NULL) { 664 dev = dev_get_by_name_rcu(net, dev_name); 665 if (dev == NULL) { 666 ret_val = -ENODEV; 667 goto unlhsh_remove_return; 668 } 669 iface = netlbl_unlhsh_search_iface(dev->ifindex); 670 } else 671 iface = rcu_dereference(netlbl_unlhsh_def); 672 if (iface == NULL) { 673 ret_val = -ENOENT; 674 goto unlhsh_remove_return; 675 } 676 switch (addr_len) { 677 case sizeof(struct in_addr): 678 ret_val = netlbl_unlhsh_remove_addr4(net, 679 iface, addr, mask, 680 audit_info); 681 break; 682#if IS_ENABLED(CONFIG_IPV6) 683 case sizeof(struct in6_addr): 684 ret_val = netlbl_unlhsh_remove_addr6(net, 685 iface, addr, mask, 686 audit_info); 687 break; 688#endif /* IPv6 */ 689 default: 690 ret_val = -EINVAL; 691 } 692 if (ret_val == 0) { 693 netlbl_unlhsh_condremove_iface(iface); 694 atomic_dec(&netlabel_mgmt_protocount); 695 } 696 697unlhsh_remove_return: 698 rcu_read_unlock(); 699 return ret_val; 700} 701 702/* 703 * General Helper Functions 704 */ 705 706/** 707 * netlbl_unlhsh_netdev_handler - Network device notification handler 708 * @this: notifier block 709 * @event: the event 710 * @ptr: the netdevice notifier info (cast to void) 711 * 712 * Description: 713 * Handle network device events, although at present all we care about is a 714 * network device going away. In the case of a device going away we clear any 715 * related entries from the unlabeled connection hash table. 716 * 717 */ 718static int netlbl_unlhsh_netdev_handler(struct notifier_block *this, 719 unsigned long event, void *ptr) 720{ 721 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 722 struct netlbl_unlhsh_iface *iface = NULL; 723 724 if (!net_eq(dev_net(dev), &init_net)) 725 return NOTIFY_DONE; 726 727 /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */ 728 if (event == NETDEV_DOWN) { 729 spin_lock(&netlbl_unlhsh_lock); 730 iface = netlbl_unlhsh_search_iface(dev->ifindex); 731 if (iface != NULL && iface->valid) { 732 iface->valid = 0; 733 list_del_rcu(&iface->list); 734 } else 735 iface = NULL; 736 spin_unlock(&netlbl_unlhsh_lock); 737 } 738 739 if (iface != NULL) 740 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); 741 742 return NOTIFY_DONE; 743} 744 745/** 746 * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag 747 * @value: desired value 748 * @audit_info: NetLabel audit information 749 * 750 * Description: 751 * Set the value of the unlabeled accept flag to @value. 752 * 753 */ 754static void netlbl_unlabel_acceptflg_set(u8 value, 755 struct netlbl_audit *audit_info) 756{ 757 struct audit_buffer *audit_buf; 758 u8 old_val; 759 760 old_val = netlabel_unlabel_acceptflg; 761 netlabel_unlabel_acceptflg = value; 762 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, 763 audit_info); 764 if (audit_buf != NULL) { 765 audit_log_format(audit_buf, 766 " unlbl_accept=%u old=%u", value, old_val); 767 audit_log_end(audit_buf); 768 } 769} 770 771/** 772 * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information 773 * @info: the Generic NETLINK info block 774 * @addr: the IP address 775 * @mask: the IP address mask 776 * @len: the address length 777 * 778 * Description: 779 * Examine the Generic NETLINK message and extract the IP address information. 780 * Returns zero on success, negative values on failure. 781 * 782 */ 783static int netlbl_unlabel_addrinfo_get(struct genl_info *info, 784 void **addr, 785 void **mask, 786 u32 *len) 787{ 788 u32 addr_len; 789 790 if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) { 791 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); 792 if (addr_len != sizeof(struct in_addr) && 793 addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK])) 794 return -EINVAL; 795 *len = addr_len; 796 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); 797 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]); 798 return 0; 799 } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) { 800 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); 801 if (addr_len != sizeof(struct in6_addr) && 802 addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK])) 803 return -EINVAL; 804 *len = addr_len; 805 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); 806 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]); 807 return 0; 808 } 809 810 return -EINVAL; 811} 812 813/* 814 * NetLabel Command Handlers 815 */ 816 817/** 818 * netlbl_unlabel_accept - Handle an ACCEPT message 819 * @skb: the NETLINK buffer 820 * @info: the Generic NETLINK info block 821 * 822 * Description: 823 * Process a user generated ACCEPT message and set the accept flag accordingly. 824 * Returns zero on success, negative values on failure. 825 * 826 */ 827static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info) 828{ 829 u8 value; 830 struct netlbl_audit audit_info; 831 832 if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { 833 value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); 834 if (value == 1 || value == 0) { 835 netlbl_netlink_auditinfo(skb, &audit_info); 836 netlbl_unlabel_acceptflg_set(value, &audit_info); 837 return 0; 838 } 839 } 840 841 return -EINVAL; 842} 843 844/** 845 * netlbl_unlabel_list - Handle a LIST message 846 * @skb: the NETLINK buffer 847 * @info: the Generic NETLINK info block 848 * 849 * Description: 850 * Process a user generated LIST message and respond with the current status. 851 * Returns zero on success, negative values on failure. 852 * 853 */ 854static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info) 855{ 856 int ret_val = -EINVAL; 857 struct sk_buff *ans_skb; 858 void *data; 859 860 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 861 if (ans_skb == NULL) 862 goto list_failure; 863 data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family, 864 0, NLBL_UNLABEL_C_LIST); 865 if (data == NULL) { 866 ret_val = -ENOMEM; 867 goto list_failure; 868 } 869 870 ret_val = nla_put_u8(ans_skb, 871 NLBL_UNLABEL_A_ACPTFLG, 872 netlabel_unlabel_acceptflg); 873 if (ret_val != 0) 874 goto list_failure; 875 876 genlmsg_end(ans_skb, data); 877 return genlmsg_reply(ans_skb, info); 878 879list_failure: 880 kfree_skb(ans_skb); 881 return ret_val; 882} 883 884/** 885 * netlbl_unlabel_staticadd - Handle a STATICADD message 886 * @skb: the NETLINK buffer 887 * @info: the Generic NETLINK info block 888 * 889 * Description: 890 * Process a user generated STATICADD message and add a new unlabeled 891 * connection entry to the hash table. Returns zero on success, negative 892 * values on failure. 893 * 894 */ 895static int netlbl_unlabel_staticadd(struct sk_buff *skb, 896 struct genl_info *info) 897{ 898 int ret_val; 899 char *dev_name; 900 void *addr; 901 void *mask; 902 u32 addr_len; 903 u32 secid; 904 struct netlbl_audit audit_info; 905 906 /* Don't allow users to add both IPv4 and IPv6 addresses for a 907 * single entry. However, allow users to create two entries, one each 908 * for IPv4 and IPv4, with the same LSM security context which should 909 * achieve the same result. */ 910 if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || 911 !info->attrs[NLBL_UNLABEL_A_IFACE] || 912 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || 913 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ 914 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || 915 !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) 916 return -EINVAL; 917 918 netlbl_netlink_auditinfo(skb, &audit_info); 919 920 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); 921 if (ret_val != 0) 922 return ret_val; 923 dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); 924 ret_val = security_secctx_to_secid( 925 nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), 926 nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), 927 &secid); 928 if (ret_val != 0) 929 return ret_val; 930 931 return netlbl_unlhsh_add(&init_net, 932 dev_name, addr, mask, addr_len, secid, 933 &audit_info); 934} 935 936/** 937 * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message 938 * @skb: the NETLINK buffer 939 * @info: the Generic NETLINK info block 940 * 941 * Description: 942 * Process a user generated STATICADDDEF message and add a new default 943 * unlabeled connection entry. Returns zero on success, negative values on 944 * failure. 945 * 946 */ 947static int netlbl_unlabel_staticadddef(struct sk_buff *skb, 948 struct genl_info *info) 949{ 950 int ret_val; 951 void *addr; 952 void *mask; 953 u32 addr_len; 954 u32 secid; 955 struct netlbl_audit audit_info; 956 957 /* Don't allow users to add both IPv4 and IPv6 addresses for a 958 * single entry. However, allow users to create two entries, one each 959 * for IPv4 and IPv6, with the same LSM security context which should 960 * achieve the same result. */ 961 if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || 962 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || 963 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ 964 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || 965 !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) 966 return -EINVAL; 967 968 netlbl_netlink_auditinfo(skb, &audit_info); 969 970 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); 971 if (ret_val != 0) 972 return ret_val; 973 ret_val = security_secctx_to_secid( 974 nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), 975 nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), 976 &secid); 977 if (ret_val != 0) 978 return ret_val; 979 980 return netlbl_unlhsh_add(&init_net, 981 NULL, addr, mask, addr_len, secid, 982 &audit_info); 983} 984 985/** 986 * netlbl_unlabel_staticremove - Handle a STATICREMOVE message 987 * @skb: the NETLINK buffer 988 * @info: the Generic NETLINK info block 989 * 990 * Description: 991 * Process a user generated STATICREMOVE message and remove the specified 992 * unlabeled connection entry. Returns zero on success, negative values on 993 * failure. 994 * 995 */ 996static int netlbl_unlabel_staticremove(struct sk_buff *skb, 997 struct genl_info *info) 998{ 999 int ret_val; 1000 char *dev_name; 1001 void *addr; 1002 void *mask; 1003 u32 addr_len; 1004 struct netlbl_audit audit_info; 1005 1006 /* See the note in netlbl_unlabel_staticadd() about not allowing both 1007 * IPv4 and IPv6 in the same entry. */ 1008 if (!info->attrs[NLBL_UNLABEL_A_IFACE] || 1009 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || 1010 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ 1011 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || 1012 !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) 1013 return -EINVAL; 1014 1015 netlbl_netlink_auditinfo(skb, &audit_info); 1016 1017 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); 1018 if (ret_val != 0) 1019 return ret_val; 1020 dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); 1021 1022 return netlbl_unlhsh_remove(&init_net, 1023 dev_name, addr, mask, addr_len, 1024 &audit_info); 1025} 1026 1027/** 1028 * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message 1029 * @skb: the NETLINK buffer 1030 * @info: the Generic NETLINK info block 1031 * 1032 * Description: 1033 * Process a user generated STATICREMOVEDEF message and remove the default 1034 * unlabeled connection entry. Returns zero on success, negative values on 1035 * failure. 1036 * 1037 */ 1038static int netlbl_unlabel_staticremovedef(struct sk_buff *skb, 1039 struct genl_info *info) 1040{ 1041 int ret_val; 1042 void *addr; 1043 void *mask; 1044 u32 addr_len; 1045 struct netlbl_audit audit_info; 1046 1047 /* See the note in netlbl_unlabel_staticadd() about not allowing both 1048 * IPv4 and IPv6 in the same entry. */ 1049 if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || 1050 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ 1051 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || 1052 !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) 1053 return -EINVAL; 1054 1055 netlbl_netlink_auditinfo(skb, &audit_info); 1056 1057 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); 1058 if (ret_val != 0) 1059 return ret_val; 1060 1061 return netlbl_unlhsh_remove(&init_net, 1062 NULL, addr, mask, addr_len, 1063 &audit_info); 1064} 1065 1066 1067/** 1068 * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF] 1069 * @cmd: command/message 1070 * @iface: the interface entry 1071 * @addr4: the IPv4 address entry 1072 * @addr6: the IPv6 address entry 1073 * @arg: the netlbl_unlhsh_walk_arg structure 1074 * 1075 * Description: 1076 * This function is designed to be used to generate a response for a 1077 * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6 1078 * can be specified, not both, the other unspecified entry should be set to 1079 * NULL by the caller. Returns the size of the message on success, negative 1080 * values on failure. 1081 * 1082 */ 1083static int netlbl_unlabel_staticlist_gen(u32 cmd, 1084 const struct netlbl_unlhsh_iface *iface, 1085 const struct netlbl_unlhsh_addr4 *addr4, 1086 const struct netlbl_unlhsh_addr6 *addr6, 1087 void *arg) 1088{ 1089 int ret_val = -ENOMEM; 1090 struct netlbl_unlhsh_walk_arg *cb_arg = arg; 1091 struct net_device *dev; 1092 void *data; 1093 u32 secid; 1094 char *secctx; 1095 u32 secctx_len; 1096 1097 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid, 1098 cb_arg->seq, &netlbl_unlabel_gnl_family, 1099 NLM_F_MULTI, cmd); 1100 if (data == NULL) 1101 goto list_cb_failure; 1102 1103 if (iface->ifindex > 0) { 1104 dev = dev_get_by_index(&init_net, iface->ifindex); 1105 if (!dev) { 1106 ret_val = -ENODEV; 1107 goto list_cb_failure; 1108 } 1109 ret_val = nla_put_string(cb_arg->skb, 1110 NLBL_UNLABEL_A_IFACE, dev->name); 1111 dev_put(dev); 1112 if (ret_val != 0) 1113 goto list_cb_failure; 1114 } 1115 1116 if (addr4) { 1117 struct in_addr addr_struct; 1118 1119 addr_struct.s_addr = addr4->list.addr; 1120 ret_val = nla_put(cb_arg->skb, 1121 NLBL_UNLABEL_A_IPV4ADDR, 1122 sizeof(struct in_addr), 1123 &addr_struct); 1124 if (ret_val != 0) 1125 goto list_cb_failure; 1126 1127 addr_struct.s_addr = addr4->list.mask; 1128 ret_val = nla_put(cb_arg->skb, 1129 NLBL_UNLABEL_A_IPV4MASK, 1130 sizeof(struct in_addr), 1131 &addr_struct); 1132 if (ret_val != 0) 1133 goto list_cb_failure; 1134 1135 secid = addr4->secid; 1136 } else { 1137 ret_val = nla_put(cb_arg->skb, 1138 NLBL_UNLABEL_A_IPV6ADDR, 1139 sizeof(struct in6_addr), 1140 &addr6->list.addr); 1141 if (ret_val != 0) 1142 goto list_cb_failure; 1143 1144 ret_val = nla_put(cb_arg->skb, 1145 NLBL_UNLABEL_A_IPV6MASK, 1146 sizeof(struct in6_addr), 1147 &addr6->list.mask); 1148 if (ret_val != 0) 1149 goto list_cb_failure; 1150 1151 secid = addr6->secid; 1152 } 1153 1154 ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len); 1155 if (ret_val != 0) 1156 goto list_cb_failure; 1157 ret_val = nla_put(cb_arg->skb, 1158 NLBL_UNLABEL_A_SECCTX, 1159 secctx_len, 1160 secctx); 1161 security_release_secctx(secctx, secctx_len); 1162 if (ret_val != 0) 1163 goto list_cb_failure; 1164 1165 cb_arg->seq++; 1166 return genlmsg_end(cb_arg->skb, data); 1167 1168list_cb_failure: 1169 genlmsg_cancel(cb_arg->skb, data); 1170 return ret_val; 1171} 1172 1173/** 1174 * netlbl_unlabel_staticlist - Handle a STATICLIST message 1175 * @skb: the NETLINK buffer 1176 * @cb: the NETLINK callback 1177 * 1178 * Description: 1179 * Process a user generated STATICLIST message and dump the unlabeled 1180 * connection hash table in a form suitable for use in a kernel generated 1181 * STATICLIST message. Returns the length of @skb. 1182 * 1183 */ 1184static int netlbl_unlabel_staticlist(struct sk_buff *skb, 1185 struct netlink_callback *cb) 1186{ 1187 struct netlbl_unlhsh_walk_arg cb_arg; 1188 u32 skip_bkt = cb->args[0]; 1189 u32 skip_chain = cb->args[1]; 1190 u32 iter_bkt; 1191 u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0; 1192 struct netlbl_unlhsh_iface *iface; 1193 struct list_head *iter_list; 1194 struct netlbl_af4list *addr4; 1195#if IS_ENABLED(CONFIG_IPV6) 1196 struct netlbl_af6list *addr6; 1197#endif 1198 1199 cb_arg.nl_cb = cb; 1200 cb_arg.skb = skb; 1201 cb_arg.seq = cb->nlh->nlmsg_seq; 1202 1203 rcu_read_lock(); 1204 for (iter_bkt = skip_bkt; 1205 iter_bkt < rcu_dereference(netlbl_unlhsh)->size; 1206 iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) { 1207 iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt]; 1208 list_for_each_entry_rcu(iface, iter_list, list) { 1209 if (!iface->valid || 1210 iter_chain++ < skip_chain) 1211 continue; 1212 netlbl_af4list_foreach_rcu(addr4, 1213 &iface->addr4_list) { 1214 if (iter_addr4++ < cb->args[2]) 1215 continue; 1216 if (netlbl_unlabel_staticlist_gen( 1217 NLBL_UNLABEL_C_STATICLIST, 1218 iface, 1219 netlbl_unlhsh_addr4_entry(addr4), 1220 NULL, 1221 &cb_arg) < 0) { 1222 iter_addr4--; 1223 iter_chain--; 1224 goto unlabel_staticlist_return; 1225 } 1226 } 1227#if IS_ENABLED(CONFIG_IPV6) 1228 netlbl_af6list_foreach_rcu(addr6, 1229 &iface->addr6_list) { 1230 if (iter_addr6++ < cb->args[3]) 1231 continue; 1232 if (netlbl_unlabel_staticlist_gen( 1233 NLBL_UNLABEL_C_STATICLIST, 1234 iface, 1235 NULL, 1236 netlbl_unlhsh_addr6_entry(addr6), 1237 &cb_arg) < 0) { 1238 iter_addr6--; 1239 iter_chain--; 1240 goto unlabel_staticlist_return; 1241 } 1242 } 1243#endif /* IPv6 */ 1244 } 1245 } 1246 1247unlabel_staticlist_return: 1248 rcu_read_unlock(); 1249 cb->args[0] = iter_bkt; 1250 cb->args[1] = iter_chain; 1251 cb->args[2] = iter_addr4; 1252 cb->args[3] = iter_addr6; 1253 return skb->len; 1254} 1255 1256/** 1257 * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message 1258 * @skb: the NETLINK buffer 1259 * @cb: the NETLINK callback 1260 * 1261 * Description: 1262 * Process a user generated STATICLISTDEF message and dump the default 1263 * unlabeled connection entry in a form suitable for use in a kernel generated 1264 * STATICLISTDEF message. Returns the length of @skb. 1265 * 1266 */ 1267static int netlbl_unlabel_staticlistdef(struct sk_buff *skb, 1268 struct netlink_callback *cb) 1269{ 1270 struct netlbl_unlhsh_walk_arg cb_arg; 1271 struct netlbl_unlhsh_iface *iface; 1272 u32 iter_addr4 = 0, iter_addr6 = 0; 1273 struct netlbl_af4list *addr4; 1274#if IS_ENABLED(CONFIG_IPV6) 1275 struct netlbl_af6list *addr6; 1276#endif 1277 1278 cb_arg.nl_cb = cb; 1279 cb_arg.skb = skb; 1280 cb_arg.seq = cb->nlh->nlmsg_seq; 1281 1282 rcu_read_lock(); 1283 iface = rcu_dereference(netlbl_unlhsh_def); 1284 if (iface == NULL || !iface->valid) 1285 goto unlabel_staticlistdef_return; 1286 1287 netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) { 1288 if (iter_addr4++ < cb->args[0]) 1289 continue; 1290 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, 1291 iface, 1292 netlbl_unlhsh_addr4_entry(addr4), 1293 NULL, 1294 &cb_arg) < 0) { 1295 iter_addr4--; 1296 goto unlabel_staticlistdef_return; 1297 } 1298 } 1299#if IS_ENABLED(CONFIG_IPV6) 1300 netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) { 1301 if (iter_addr6++ < cb->args[1]) 1302 continue; 1303 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, 1304 iface, 1305 NULL, 1306 netlbl_unlhsh_addr6_entry(addr6), 1307 &cb_arg) < 0) { 1308 iter_addr6--; 1309 goto unlabel_staticlistdef_return; 1310 } 1311 } 1312#endif /* IPv6 */ 1313 1314unlabel_staticlistdef_return: 1315 rcu_read_unlock(); 1316 cb->args[0] = iter_addr4; 1317 cb->args[1] = iter_addr6; 1318 return skb->len; 1319} 1320 1321/* 1322 * NetLabel Generic NETLINK Command Definitions 1323 */ 1324 1325static const struct genl_ops netlbl_unlabel_genl_ops[] = { 1326 { 1327 .cmd = NLBL_UNLABEL_C_STATICADD, 1328 .flags = GENL_ADMIN_PERM, 1329 .policy = netlbl_unlabel_genl_policy, 1330 .doit = netlbl_unlabel_staticadd, 1331 .dumpit = NULL, 1332 }, 1333 { 1334 .cmd = NLBL_UNLABEL_C_STATICREMOVE, 1335 .flags = GENL_ADMIN_PERM, 1336 .policy = netlbl_unlabel_genl_policy, 1337 .doit = netlbl_unlabel_staticremove, 1338 .dumpit = NULL, 1339 }, 1340 { 1341 .cmd = NLBL_UNLABEL_C_STATICLIST, 1342 .flags = 0, 1343 .policy = netlbl_unlabel_genl_policy, 1344 .doit = NULL, 1345 .dumpit = netlbl_unlabel_staticlist, 1346 }, 1347 { 1348 .cmd = NLBL_UNLABEL_C_STATICADDDEF, 1349 .flags = GENL_ADMIN_PERM, 1350 .policy = netlbl_unlabel_genl_policy, 1351 .doit = netlbl_unlabel_staticadddef, 1352 .dumpit = NULL, 1353 }, 1354 { 1355 .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF, 1356 .flags = GENL_ADMIN_PERM, 1357 .policy = netlbl_unlabel_genl_policy, 1358 .doit = netlbl_unlabel_staticremovedef, 1359 .dumpit = NULL, 1360 }, 1361 { 1362 .cmd = NLBL_UNLABEL_C_STATICLISTDEF, 1363 .flags = 0, 1364 .policy = netlbl_unlabel_genl_policy, 1365 .doit = NULL, 1366 .dumpit = netlbl_unlabel_staticlistdef, 1367 }, 1368 { 1369 .cmd = NLBL_UNLABEL_C_ACCEPT, 1370 .flags = GENL_ADMIN_PERM, 1371 .policy = netlbl_unlabel_genl_policy, 1372 .doit = netlbl_unlabel_accept, 1373 .dumpit = NULL, 1374 }, 1375 { 1376 .cmd = NLBL_UNLABEL_C_LIST, 1377 .flags = 0, 1378 .policy = netlbl_unlabel_genl_policy, 1379 .doit = netlbl_unlabel_list, 1380 .dumpit = NULL, 1381 }, 1382}; 1383 1384/* 1385 * NetLabel Generic NETLINK Protocol Functions 1386 */ 1387 1388/** 1389 * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component 1390 * 1391 * Description: 1392 * Register the unlabeled packet NetLabel component with the Generic NETLINK 1393 * mechanism. Returns zero on success, negative values on failure. 1394 * 1395 */ 1396int __init netlbl_unlabel_genl_init(void) 1397{ 1398 return genl_register_family_with_ops(&netlbl_unlabel_gnl_family, 1399 netlbl_unlabel_genl_ops); 1400} 1401 1402/* 1403 * NetLabel KAPI Hooks 1404 */ 1405 1406static struct notifier_block netlbl_unlhsh_netdev_notifier = { 1407 .notifier_call = netlbl_unlhsh_netdev_handler, 1408}; 1409 1410/** 1411 * netlbl_unlabel_init - Initialize the unlabeled connection hash table 1412 * @size: the number of bits to use for the hash buckets 1413 * 1414 * Description: 1415 * Initializes the unlabeled connection hash table and registers a network 1416 * device notification handler. This function should only be called by the 1417 * NetLabel subsystem itself during initialization. Returns zero on success, 1418 * non-zero values on error. 1419 * 1420 */ 1421int __init netlbl_unlabel_init(u32 size) 1422{ 1423 u32 iter; 1424 struct netlbl_unlhsh_tbl *hsh_tbl; 1425 1426 if (size == 0) 1427 return -EINVAL; 1428 1429 hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); 1430 if (hsh_tbl == NULL) 1431 return -ENOMEM; 1432 hsh_tbl->size = 1 << size; 1433 hsh_tbl->tbl = kcalloc(hsh_tbl->size, 1434 sizeof(struct list_head), 1435 GFP_KERNEL); 1436 if (hsh_tbl->tbl == NULL) { 1437 kfree(hsh_tbl); 1438 return -ENOMEM; 1439 } 1440 for (iter = 0; iter < hsh_tbl->size; iter++) 1441 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); 1442 1443 spin_lock(&netlbl_unlhsh_lock); 1444 rcu_assign_pointer(netlbl_unlhsh, hsh_tbl); 1445 spin_unlock(&netlbl_unlhsh_lock); 1446 1447 register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier); 1448 1449 return 0; 1450} 1451 1452/** 1453 * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet 1454 * @skb: the packet 1455 * @family: protocol family 1456 * @secattr: the security attributes 1457 * 1458 * Description: 1459 * Determine the security attributes, if any, for an unlabled packet and return 1460 * them in @secattr. Returns zero on success and negative values on failure. 1461 * 1462 */ 1463int netlbl_unlabel_getattr(const struct sk_buff *skb, 1464 u16 family, 1465 struct netlbl_lsm_secattr *secattr) 1466{ 1467 struct netlbl_unlhsh_iface *iface; 1468 1469 rcu_read_lock(); 1470 iface = netlbl_unlhsh_search_iface(skb->skb_iif); 1471 if (iface == NULL) 1472 iface = rcu_dereference(netlbl_unlhsh_def); 1473 if (iface == NULL || !iface->valid) 1474 goto unlabel_getattr_nolabel; 1475 switch (family) { 1476 case PF_INET: { 1477 struct iphdr *hdr4; 1478 struct netlbl_af4list *addr4; 1479 1480 hdr4 = ip_hdr(skb); 1481 addr4 = netlbl_af4list_search(hdr4->saddr, 1482 &iface->addr4_list); 1483 if (addr4 == NULL) 1484 goto unlabel_getattr_nolabel; 1485 secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid; 1486 break; 1487 } 1488#if IS_ENABLED(CONFIG_IPV6) 1489 case PF_INET6: { 1490 struct ipv6hdr *hdr6; 1491 struct netlbl_af6list *addr6; 1492 1493 hdr6 = ipv6_hdr(skb); 1494 addr6 = netlbl_af6list_search(&hdr6->saddr, 1495 &iface->addr6_list); 1496 if (addr6 == NULL) 1497 goto unlabel_getattr_nolabel; 1498 secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid; 1499 break; 1500 } 1501#endif /* IPv6 */ 1502 default: 1503 goto unlabel_getattr_nolabel; 1504 } 1505 rcu_read_unlock(); 1506 1507 secattr->flags |= NETLBL_SECATTR_SECID; 1508 secattr->type = NETLBL_NLTYPE_UNLABELED; 1509 return 0; 1510 1511unlabel_getattr_nolabel: 1512 rcu_read_unlock(); 1513 if (netlabel_unlabel_acceptflg == 0) 1514 return -ENOMSG; 1515 secattr->type = NETLBL_NLTYPE_UNLABELED; 1516 return 0; 1517} 1518 1519/** 1520 * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets 1521 * 1522 * Description: 1523 * Set the default NetLabel configuration to allow incoming unlabeled packets 1524 * and to send unlabeled network traffic by default. 1525 * 1526 */ 1527int __init netlbl_unlabel_defconf(void) 1528{ 1529 int ret_val; 1530 struct netlbl_dom_map *entry; 1531 struct netlbl_audit audit_info; 1532 1533 /* Only the kernel is allowed to call this function and the only time 1534 * it is called is at bootup before the audit subsystem is reporting 1535 * messages so don't worry to much about these values. */ 1536 security_task_getsecid(current, &audit_info.secid); 1537 audit_info.loginuid = GLOBAL_ROOT_UID; 1538 audit_info.sessionid = 0; 1539 1540 entry = kzalloc(sizeof(*entry), GFP_KERNEL); 1541 if (entry == NULL) 1542 return -ENOMEM; 1543 entry->def.type = NETLBL_NLTYPE_UNLABELED; 1544 ret_val = netlbl_domhsh_add_default(entry, &audit_info); 1545 if (ret_val != 0) 1546 return ret_val; 1547 1548 netlbl_unlabel_acceptflg_set(1, &audit_info); 1549 1550 return 0; 1551} 1552