1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * NetLabel Domain Hash Table
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
10 * Author: Paul Moore <paul@paul-moore.com>
14 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
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>
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"
35 struct netlbl_domhsh_tbl {
36 struct list_head *tbl;
40 /* Domain hash table */
41 /* updates should be so rare that having one spinlock for the entire hash table
43 static DEFINE_SPINLOCK(netlbl_domhsh_lock);
44 #define netlbl_domhsh_rcu_deref(p) \
45 rcu_dereference_check(p, lockdep_is_held(&netlbl_domhsh_lock))
46 static struct netlbl_domhsh_tbl __rcu *netlbl_domhsh;
47 static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv4;
48 static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv6;
51 * Domain Hash Table Helper Functions
55 * netlbl_domhsh_free_entry - Frees a domain hash table entry
56 * @entry: the entry's RCU field
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
64 static void netlbl_domhsh_free_entry(struct rcu_head *entry)
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;
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));
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));
94 * netlbl_domhsh_hash - Hashing function for the domain hash table
95 * @domain: the domain name to hash
98 * This is the hashing function for the domain hash table, it returns the
99 * correct bucket number for the domain. The caller is responsible for
100 * ensuring that the hash table is protected with either a RCU read lock or the
104 static u32 netlbl_domhsh_hash(const char *key)
110 /* This is taken (with slight modification) from
111 * security/selinux/ss/symtab.c:symhash() */
113 for (iter = 0, val = 0, len = strlen(key); iter < len; iter++)
114 val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter];
115 return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1);
118 static bool netlbl_family_match(u16 f1, u16 f2)
120 return (f1 == f2) || (f1 == AF_UNSPEC) || (f2 == AF_UNSPEC);
124 * netlbl_domhsh_search - Search for a domain entry
125 * @domain: the domain
126 * @family: the address family
129 * Searches the domain hash table and returns a pointer to the hash table
130 * entry if found, otherwise NULL is returned. @family may be %AF_UNSPEC
131 * which matches any address family entries. The caller is responsible for
132 * ensuring that the hash table is protected with either a RCU read lock or the
136 static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain,
140 struct list_head *bkt_list;
141 struct netlbl_dom_map *iter;
143 if (domain != NULL) {
144 bkt = netlbl_domhsh_hash(domain);
145 bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt];
146 list_for_each_entry_rcu(iter, bkt_list, list)
148 netlbl_family_match(iter->family, family) &&
149 strcmp(iter->domain, domain) == 0)
157 * netlbl_domhsh_search_def - Search for a domain entry
158 * @domain: the domain
159 * @family: the address family
162 * Searches the domain hash table and returns a pointer to the hash table
163 * entry if an exact match is found, if an exact match is not present in the
164 * hash table then the default entry is returned if valid otherwise NULL is
165 * returned. @family may be %AF_UNSPEC which matches any address family
166 * entries. The caller is responsible ensuring that the hash table is
167 * protected with either a RCU read lock or the hash table lock.
170 static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain,
173 struct netlbl_dom_map *entry;
175 entry = netlbl_domhsh_search(domain, family);
178 if (family == AF_INET || family == AF_UNSPEC) {
179 entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv4);
180 if (entry != NULL && entry->valid)
183 if (family == AF_INET6 || family == AF_UNSPEC) {
184 entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv6);
185 if (entry != NULL && entry->valid)
193 * netlbl_domhsh_audit_add - Generate an audit entry for an add event
194 * @entry: the entry being added
195 * @addr4: the IPv4 address information
196 * @addr6: the IPv6 address information
197 * @result: the result code
198 * @audit_info: NetLabel audit information
201 * Generate an audit record for adding a new NetLabel/LSM mapping entry with
202 * the given information. Caller is responsible for holding the necessary
206 static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry,
207 struct netlbl_af4list *addr4,
208 struct netlbl_af6list *addr6,
210 struct netlbl_audit *audit_info)
212 struct audit_buffer *audit_buf;
213 struct cipso_v4_doi *cipsov4 = NULL;
214 struct calipso_doi *calipso = NULL;
217 audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info);
218 if (audit_buf != NULL) {
219 audit_log_format(audit_buf, " nlbl_domain=%s",
220 entry->domain ? entry->domain : "(default)");
222 struct netlbl_domaddr4_map *map4;
223 map4 = netlbl_domhsh_addr4_entry(addr4);
224 type = map4->def.type;
225 cipsov4 = map4->def.cipso;
226 netlbl_af4list_audit_addr(audit_buf, 0, NULL,
227 addr4->addr, addr4->mask);
228 #if IS_ENABLED(CONFIG_IPV6)
229 } else if (addr6 != NULL) {
230 struct netlbl_domaddr6_map *map6;
231 map6 = netlbl_domhsh_addr6_entry(addr6);
232 type = map6->def.type;
233 calipso = map6->def.calipso;
234 netlbl_af6list_audit_addr(audit_buf, 0, NULL,
235 &addr6->addr, &addr6->mask);
238 type = entry->def.type;
239 cipsov4 = entry->def.cipso;
240 calipso = entry->def.calipso;
243 case NETLBL_NLTYPE_UNLABELED:
244 audit_log_format(audit_buf, " nlbl_protocol=unlbl");
246 case NETLBL_NLTYPE_CIPSOV4:
247 BUG_ON(cipsov4 == NULL);
248 audit_log_format(audit_buf,
249 " nlbl_protocol=cipsov4 cipso_doi=%u",
252 case NETLBL_NLTYPE_CALIPSO:
253 BUG_ON(calipso == NULL);
254 audit_log_format(audit_buf,
255 " nlbl_protocol=calipso calipso_doi=%u",
259 audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0);
260 audit_log_end(audit_buf);
265 * netlbl_domhsh_validate - Validate a new domain mapping entry
266 * @entry: the entry to validate
268 * This function validates the new domain mapping entry to ensure that it is
269 * a valid entry. Returns zero on success, negative values on failure.
272 static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry)
274 struct netlbl_af4list *iter4;
275 struct netlbl_domaddr4_map *map4;
276 #if IS_ENABLED(CONFIG_IPV6)
277 struct netlbl_af6list *iter6;
278 struct netlbl_domaddr6_map *map6;
284 if (entry->family != AF_INET && entry->family != AF_INET6 &&
285 (entry->family != AF_UNSPEC ||
286 entry->def.type != NETLBL_NLTYPE_UNLABELED))
289 switch (entry->def.type) {
290 case NETLBL_NLTYPE_UNLABELED:
291 if (entry->def.cipso != NULL || entry->def.calipso != NULL ||
292 entry->def.addrsel != NULL)
295 case NETLBL_NLTYPE_CIPSOV4:
296 if (entry->family != AF_INET ||
297 entry->def.cipso == NULL)
300 case NETLBL_NLTYPE_CALIPSO:
301 if (entry->family != AF_INET6 ||
302 entry->def.calipso == NULL)
305 case NETLBL_NLTYPE_ADDRSELECT:
306 netlbl_af4list_foreach(iter4, &entry->def.addrsel->list4) {
307 map4 = netlbl_domhsh_addr4_entry(iter4);
308 switch (map4->def.type) {
309 case NETLBL_NLTYPE_UNLABELED:
310 if (map4->def.cipso != NULL)
313 case NETLBL_NLTYPE_CIPSOV4:
314 if (map4->def.cipso == NULL)
321 #if IS_ENABLED(CONFIG_IPV6)
322 netlbl_af6list_foreach(iter6, &entry->def.addrsel->list6) {
323 map6 = netlbl_domhsh_addr6_entry(iter6);
324 switch (map6->def.type) {
325 case NETLBL_NLTYPE_UNLABELED:
326 if (map6->def.calipso != NULL)
329 case NETLBL_NLTYPE_CALIPSO:
330 if (map6->def.calipso == NULL)
347 * Domain Hash Table Functions
351 * netlbl_domhsh_init - Init for the domain hash
352 * @size: the number of bits to use for the hash buckets
355 * Initializes the domain hash table, should be called only by
356 * netlbl_user_init() during initialization. Returns zero on success, non-zero
360 int __init netlbl_domhsh_init(u32 size)
363 struct netlbl_domhsh_tbl *hsh_tbl;
368 hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
371 hsh_tbl->size = 1 << size;
372 hsh_tbl->tbl = kcalloc(hsh_tbl->size,
373 sizeof(struct list_head),
375 if (hsh_tbl->tbl == NULL) {
379 for (iter = 0; iter < hsh_tbl->size; iter++)
380 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
382 spin_lock(&netlbl_domhsh_lock);
383 rcu_assign_pointer(netlbl_domhsh, hsh_tbl);
384 spin_unlock(&netlbl_domhsh_lock);
390 * netlbl_domhsh_add - Adds a entry to the domain hash table
391 * @entry: the entry to add
392 * @audit_info: NetLabel audit information
395 * Adds a new entry to the domain hash table and handles any updates to the
396 * lower level protocol handler (i.e. CIPSO). @entry->family may be set to
397 * %AF_UNSPEC which will add an entry that matches all address families. This
398 * is only useful for the unlabelled type and will only succeed if there is no
399 * existing entry for any address family with the same domain. Returns zero
400 * on success, negative on failure.
403 int netlbl_domhsh_add(struct netlbl_dom_map *entry,
404 struct netlbl_audit *audit_info)
407 struct netlbl_dom_map *entry_old, *entry_b;
408 struct netlbl_af4list *iter4;
409 struct netlbl_af4list *tmp4;
410 #if IS_ENABLED(CONFIG_IPV6)
411 struct netlbl_af6list *iter6;
412 struct netlbl_af6list *tmp6;
415 ret_val = netlbl_domhsh_validate(entry);
419 /* XXX - we can remove this RCU read lock as the spinlock protects the
420 * entire function, but before we do we need to fixup the
421 * netlbl_af[4,6]list RCU functions to do "the right thing" with
422 * respect to rcu_dereference() when only a spinlock is held. */
424 spin_lock(&netlbl_domhsh_lock);
425 if (entry->domain != NULL)
426 entry_old = netlbl_domhsh_search(entry->domain, entry->family);
428 entry_old = netlbl_domhsh_search_def(entry->domain,
430 if (entry_old == NULL) {
433 if (entry->domain != NULL) {
434 u32 bkt = netlbl_domhsh_hash(entry->domain);
435 list_add_tail_rcu(&entry->list,
436 &rcu_dereference(netlbl_domhsh)->tbl[bkt]);
438 INIT_LIST_HEAD(&entry->list);
439 switch (entry->family) {
441 rcu_assign_pointer(netlbl_domhsh_def_ipv4,
445 rcu_assign_pointer(netlbl_domhsh_def_ipv6,
449 if (entry->def.type !=
450 NETLBL_NLTYPE_UNLABELED) {
454 entry_b = kzalloc(sizeof(*entry_b), GFP_ATOMIC);
455 if (entry_b == NULL) {
459 entry_b->family = AF_INET6;
460 entry_b->def.type = NETLBL_NLTYPE_UNLABELED;
462 entry->family = AF_INET;
463 rcu_assign_pointer(netlbl_domhsh_def_ipv4,
465 rcu_assign_pointer(netlbl_domhsh_def_ipv6,
469 /* Already checked in
470 * netlbl_domhsh_validate(). */
476 if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
477 netlbl_af4list_foreach_rcu(iter4,
478 &entry->def.addrsel->list4)
479 netlbl_domhsh_audit_add(entry, iter4, NULL,
480 ret_val, audit_info);
481 #if IS_ENABLED(CONFIG_IPV6)
482 netlbl_af6list_foreach_rcu(iter6,
483 &entry->def.addrsel->list6)
484 netlbl_domhsh_audit_add(entry, NULL, iter6,
485 ret_val, audit_info);
488 netlbl_domhsh_audit_add(entry, NULL, NULL,
489 ret_val, audit_info);
490 } else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT &&
491 entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
492 struct list_head *old_list4;
493 struct list_head *old_list6;
495 old_list4 = &entry_old->def.addrsel->list4;
496 old_list6 = &entry_old->def.addrsel->list6;
498 /* we only allow the addition of address selectors if all of
499 * the selectors do not exist in the existing domain map */
500 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4)
501 if (netlbl_af4list_search_exact(iter4->addr,
507 #if IS_ENABLED(CONFIG_IPV6)
508 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6)
509 if (netlbl_af6list_search_exact(&iter6->addr,
517 netlbl_af4list_foreach_safe(iter4, tmp4,
518 &entry->def.addrsel->list4) {
519 netlbl_af4list_remove_entry(iter4);
521 ret_val = netlbl_af4list_add(iter4, old_list4);
522 netlbl_domhsh_audit_add(entry_old, iter4, NULL,
523 ret_val, audit_info);
527 #if IS_ENABLED(CONFIG_IPV6)
528 netlbl_af6list_foreach_safe(iter6, tmp6,
529 &entry->def.addrsel->list6) {
530 netlbl_af6list_remove_entry(iter6);
532 ret_val = netlbl_af6list_add(iter6, old_list6);
533 netlbl_domhsh_audit_add(entry_old, NULL, iter6,
534 ret_val, audit_info);
543 spin_unlock(&netlbl_domhsh_lock);
549 * netlbl_domhsh_add_default - Adds the default entry to the domain hash table
550 * @entry: the entry to add
551 * @audit_info: NetLabel audit information
554 * Adds a new default entry to the domain hash table and handles any updates
555 * to the lower level protocol handler (i.e. CIPSO). Returns zero on success,
556 * negative on failure.
559 int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
560 struct netlbl_audit *audit_info)
562 return netlbl_domhsh_add(entry, audit_info);
566 * netlbl_domhsh_remove_entry - Removes a given entry from the domain table
567 * @entry: the entry to remove
568 * @audit_info: NetLabel audit information
571 * Removes an entry from the domain hash table and handles any updates to the
572 * lower level protocol handler (i.e. CIPSO). Caller is responsible for
573 * ensuring that the RCU read lock is held. Returns zero on success, negative
577 int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
578 struct netlbl_audit *audit_info)
581 struct audit_buffer *audit_buf;
586 spin_lock(&netlbl_domhsh_lock);
589 if (entry == rcu_dereference(netlbl_domhsh_def_ipv4))
590 RCU_INIT_POINTER(netlbl_domhsh_def_ipv4, NULL);
591 else if (entry == rcu_dereference(netlbl_domhsh_def_ipv6))
592 RCU_INIT_POINTER(netlbl_domhsh_def_ipv6, NULL);
594 list_del_rcu(&entry->list);
597 spin_unlock(&netlbl_domhsh_lock);
599 audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info);
600 if (audit_buf != NULL) {
601 audit_log_format(audit_buf,
602 " nlbl_domain=%s res=%u",
603 entry->domain ? entry->domain : "(default)",
604 ret_val == 0 ? 1 : 0);
605 audit_log_end(audit_buf);
609 struct netlbl_af4list *iter4;
610 struct netlbl_domaddr4_map *map4;
611 #if IS_ENABLED(CONFIG_IPV6)
612 struct netlbl_af6list *iter6;
613 struct netlbl_domaddr6_map *map6;
616 switch (entry->def.type) {
617 case NETLBL_NLTYPE_ADDRSELECT:
618 netlbl_af4list_foreach_rcu(iter4,
619 &entry->def.addrsel->list4) {
620 map4 = netlbl_domhsh_addr4_entry(iter4);
621 cipso_v4_doi_putdef(map4->def.cipso);
623 #if IS_ENABLED(CONFIG_IPV6)
624 netlbl_af6list_foreach_rcu(iter6,
625 &entry->def.addrsel->list6) {
626 map6 = netlbl_domhsh_addr6_entry(iter6);
627 calipso_doi_putdef(map6->def.calipso);
631 case NETLBL_NLTYPE_CIPSOV4:
632 cipso_v4_doi_putdef(entry->def.cipso);
634 #if IS_ENABLED(CONFIG_IPV6)
635 case NETLBL_NLTYPE_CALIPSO:
636 calipso_doi_putdef(entry->def.calipso);
640 call_rcu(&entry->rcu, netlbl_domhsh_free_entry);
647 * netlbl_domhsh_remove_af4 - Removes an address selector entry
648 * @domain: the domain
649 * @addr: IPv4 address
650 * @mask: IPv4 address mask
651 * @audit_info: NetLabel audit information
654 * Removes an individual address selector from a domain mapping and potentially
655 * the entire mapping if it is empty. Returns zero on success, negative values
659 int netlbl_domhsh_remove_af4(const char *domain,
660 const struct in_addr *addr,
661 const struct in_addr *mask,
662 struct netlbl_audit *audit_info)
664 struct netlbl_dom_map *entry_map;
665 struct netlbl_af4list *entry_addr;
666 struct netlbl_af4list *iter4;
667 #if IS_ENABLED(CONFIG_IPV6)
668 struct netlbl_af6list *iter6;
670 struct netlbl_domaddr4_map *entry;
675 entry_map = netlbl_domhsh_search(domain, AF_INET);
677 entry_map = netlbl_domhsh_search_def(domain, AF_INET);
678 if (entry_map == NULL ||
679 entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT)
680 goto remove_af4_failure;
682 spin_lock(&netlbl_domhsh_lock);
683 entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
684 &entry_map->def.addrsel->list4);
685 spin_unlock(&netlbl_domhsh_lock);
687 if (entry_addr == NULL)
688 goto remove_af4_failure;
689 netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4)
690 goto remove_af4_single_addr;
691 #if IS_ENABLED(CONFIG_IPV6)
692 netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6)
693 goto remove_af4_single_addr;
695 /* the domain mapping is empty so remove it from the mapping table */
696 netlbl_domhsh_remove_entry(entry_map, audit_info);
698 remove_af4_single_addr:
700 /* yick, we can't use call_rcu here because we don't have a rcu head
701 * pointer but hopefully this should be a rare case so the pause
702 * shouldn't be a problem */
704 entry = netlbl_domhsh_addr4_entry(entry_addr);
705 cipso_v4_doi_putdef(entry->def.cipso);
714 #if IS_ENABLED(CONFIG_IPV6)
716 * netlbl_domhsh_remove_af6 - Removes an address selector entry
717 * @domain: the domain
718 * @addr: IPv6 address
719 * @mask: IPv6 address mask
720 * @audit_info: NetLabel audit information
723 * Removes an individual address selector from a domain mapping and potentially
724 * the entire mapping if it is empty. Returns zero on success, negative values
728 int netlbl_domhsh_remove_af6(const char *domain,
729 const struct in6_addr *addr,
730 const struct in6_addr *mask,
731 struct netlbl_audit *audit_info)
733 struct netlbl_dom_map *entry_map;
734 struct netlbl_af6list *entry_addr;
735 struct netlbl_af4list *iter4;
736 struct netlbl_af6list *iter6;
737 struct netlbl_domaddr6_map *entry;
742 entry_map = netlbl_domhsh_search(domain, AF_INET6);
744 entry_map = netlbl_domhsh_search_def(domain, AF_INET6);
745 if (entry_map == NULL ||
746 entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT)
747 goto remove_af6_failure;
749 spin_lock(&netlbl_domhsh_lock);
750 entry_addr = netlbl_af6list_remove(addr, mask,
751 &entry_map->def.addrsel->list6);
752 spin_unlock(&netlbl_domhsh_lock);
754 if (entry_addr == NULL)
755 goto remove_af6_failure;
756 netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4)
757 goto remove_af6_single_addr;
758 netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6)
759 goto remove_af6_single_addr;
760 /* the domain mapping is empty so remove it from the mapping table */
761 netlbl_domhsh_remove_entry(entry_map, audit_info);
763 remove_af6_single_addr:
765 /* yick, we can't use call_rcu here because we don't have a rcu head
766 * pointer but hopefully this should be a rare case so the pause
767 * shouldn't be a problem */
769 entry = netlbl_domhsh_addr6_entry(entry_addr);
770 calipso_doi_putdef(entry->def.calipso);
781 * netlbl_domhsh_remove - Removes an entry from the domain hash table
782 * @domain: the domain to remove
783 * @family: address family
784 * @audit_info: NetLabel audit information
787 * Removes an entry from the domain hash table and handles any updates to the
788 * lower level protocol handler (i.e. CIPSO). @family may be %AF_UNSPEC which
789 * removes all address family entries. Returns zero on success, negative on
793 int netlbl_domhsh_remove(const char *domain, u16 family,
794 struct netlbl_audit *audit_info)
796 int ret_val = -EINVAL;
797 struct netlbl_dom_map *entry;
801 if (family == AF_INET || family == AF_UNSPEC) {
803 entry = netlbl_domhsh_search(domain, AF_INET);
805 entry = netlbl_domhsh_search_def(domain, AF_INET);
806 ret_val = netlbl_domhsh_remove_entry(entry, audit_info);
807 if (ret_val && ret_val != -ENOENT)
810 if (family == AF_INET6 || family == AF_UNSPEC) {
814 entry = netlbl_domhsh_search(domain, AF_INET6);
816 entry = netlbl_domhsh_search_def(domain, AF_INET6);
817 ret_val2 = netlbl_domhsh_remove_entry(entry, audit_info);
818 if (ret_val2 != -ENOENT)
828 * netlbl_domhsh_remove_default - Removes the default entry from the table
829 * @family: address family
830 * @audit_info: NetLabel audit information
833 * Removes/resets the default entry corresponding to @family from the domain
834 * hash table and handles any updates to the lower level protocol handler
835 * (i.e. CIPSO). @family may be %AF_UNSPEC which removes all address family
836 * entries. Returns zero on success, negative on failure.
839 int netlbl_domhsh_remove_default(u16 family, struct netlbl_audit *audit_info)
841 return netlbl_domhsh_remove(NULL, family, audit_info);
845 * netlbl_domhsh_getentry - Get an entry from the domain hash table
846 * @domain: the domain name to search for
847 * @family: address family
850 * Look through the domain hash table searching for an entry to match @domain,
851 * with address family @family, return a pointer to a copy of the entry or
852 * NULL. The caller is responsible for ensuring that rcu_read_[un]lock() is
856 struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain, u16 family)
858 if (family == AF_UNSPEC)
860 return netlbl_domhsh_search_def(domain, family);
864 * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table
865 * @domain: the domain name to search for
866 * @addr: the IP address to search for
869 * Look through the domain hash table searching for an entry to match @domain
870 * and @addr, return a pointer to a copy of the entry or NULL. The caller is
871 * responsible for ensuring that rcu_read_[un]lock() is called.
874 struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain,
877 struct netlbl_dom_map *dom_iter;
878 struct netlbl_af4list *addr_iter;
880 dom_iter = netlbl_domhsh_search_def(domain, AF_INET);
881 if (dom_iter == NULL)
884 if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT)
885 return &dom_iter->def;
886 addr_iter = netlbl_af4list_search(addr, &dom_iter->def.addrsel->list4);
887 if (addr_iter == NULL)
889 return &(netlbl_domhsh_addr4_entry(addr_iter)->def);
892 #if IS_ENABLED(CONFIG_IPV6)
894 * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table
895 * @domain: the domain name to search for
896 * @addr: the IP address to search for
899 * Look through the domain hash table searching for an entry to match @domain
900 * and @addr, return a pointer to a copy of the entry or NULL. The caller is
901 * responsible for ensuring that rcu_read_[un]lock() is called.
904 struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain,
905 const struct in6_addr *addr)
907 struct netlbl_dom_map *dom_iter;
908 struct netlbl_af6list *addr_iter;
910 dom_iter = netlbl_domhsh_search_def(domain, AF_INET6);
911 if (dom_iter == NULL)
914 if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT)
915 return &dom_iter->def;
916 addr_iter = netlbl_af6list_search(addr, &dom_iter->def.addrsel->list6);
917 if (addr_iter == NULL)
919 return &(netlbl_domhsh_addr6_entry(addr_iter)->def);
924 * netlbl_domhsh_walk - Iterate through the domain mapping hash table
925 * @skip_bkt: the number of buckets to skip at the start
926 * @skip_chain: the number of entries to skip in the first iterated bucket
927 * @callback: callback for each entry
928 * @cb_arg: argument for the callback function
931 * Interate over the domain mapping hash table, skipping the first @skip_bkt
932 * buckets and @skip_chain entries. For each entry in the table call
933 * @callback, if @callback returns a negative value stop 'walking' through the
934 * table and return. Updates the values in @skip_bkt and @skip_chain on
935 * return. Returns zero on success, negative values on failure.
938 int netlbl_domhsh_walk(u32 *skip_bkt,
940 int (*callback) (struct netlbl_dom_map *entry, void *arg),
943 int ret_val = -ENOENT;
945 struct list_head *iter_list;
946 struct netlbl_dom_map *iter_entry;
950 for (iter_bkt = *skip_bkt;
951 iter_bkt < rcu_dereference(netlbl_domhsh)->size;
952 iter_bkt++, chain_cnt = 0) {
953 iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt];
954 list_for_each_entry_rcu(iter_entry, iter_list, list)
955 if (iter_entry->valid) {
956 if (chain_cnt++ < *skip_chain)
958 ret_val = callback(iter_entry, cb_arg);
968 *skip_bkt = iter_bkt;
969 *skip_chain = chain_cnt;