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));
88 kfree(ptr->def.addrsel);
95 * netlbl_domhsh_hash - Hashing function for the domain hash table
96 * @domain: the domain name to hash
99 * This is the hashing function for the domain hash table, it returns the
100 * correct bucket number for the domain. The caller is responsible for
101 * ensuring that the hash table is protected with either a RCU read lock or the
105 static u32 netlbl_domhsh_hash(const char *key)
111 /* This is taken (with slight modification) from
112 * security/selinux/ss/symtab.c:symhash() */
114 for (iter = 0, val = 0, len = strlen(key); iter < len; iter++)
115 val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter];
116 return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1);
119 static bool netlbl_family_match(u16 f1, u16 f2)
121 return (f1 == f2) || (f1 == AF_UNSPEC) || (f2 == AF_UNSPEC);
125 * netlbl_domhsh_search - Search for a domain entry
126 * @domain: the domain
127 * @family: the address family
130 * Searches the domain hash table and returns a pointer to the hash table
131 * entry if found, otherwise NULL is returned. @family may be %AF_UNSPEC
132 * which matches any address family entries. The caller is responsible for
133 * ensuring that the hash table is protected with either a RCU read lock or the
137 static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain,
141 struct list_head *bkt_list;
142 struct netlbl_dom_map *iter;
144 if (domain != NULL) {
145 bkt = netlbl_domhsh_hash(domain);
146 bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt];
147 list_for_each_entry_rcu(iter, bkt_list, list)
149 netlbl_family_match(iter->family, family) &&
150 strcmp(iter->domain, domain) == 0)
158 * netlbl_domhsh_search_def - Search for a domain entry
159 * @domain: the domain
160 * @family: the address family
163 * Searches the domain hash table and returns a pointer to the hash table
164 * entry if an exact match is found, if an exact match is not present in the
165 * hash table then the default entry is returned if valid otherwise NULL is
166 * returned. @family may be %AF_UNSPEC which matches any address family
167 * entries. The caller is responsible ensuring that the hash table is
168 * protected with either a RCU read lock or the hash table lock.
171 static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain,
174 struct netlbl_dom_map *entry;
176 entry = netlbl_domhsh_search(domain, family);
179 if (family == AF_INET || family == AF_UNSPEC) {
180 entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv4);
181 if (entry != NULL && entry->valid)
184 if (family == AF_INET6 || family == AF_UNSPEC) {
185 entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv6);
186 if (entry != NULL && entry->valid)
194 * netlbl_domhsh_audit_add - Generate an audit entry for an add event
195 * @entry: the entry being added
196 * @addr4: the IPv4 address information
197 * @addr6: the IPv6 address information
198 * @result: the result code
199 * @audit_info: NetLabel audit information
202 * Generate an audit record for adding a new NetLabel/LSM mapping entry with
203 * the given information. Caller is responsible for holding the necessary
207 static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry,
208 struct netlbl_af4list *addr4,
209 struct netlbl_af6list *addr6,
211 struct netlbl_audit *audit_info)
213 struct audit_buffer *audit_buf;
214 struct cipso_v4_doi *cipsov4 = NULL;
215 struct calipso_doi *calipso = NULL;
218 audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info);
219 if (audit_buf != NULL) {
220 audit_log_format(audit_buf, " nlbl_domain=%s",
221 entry->domain ? entry->domain : "(default)");
223 struct netlbl_domaddr4_map *map4;
224 map4 = netlbl_domhsh_addr4_entry(addr4);
225 type = map4->def.type;
226 cipsov4 = map4->def.cipso;
227 netlbl_af4list_audit_addr(audit_buf, 0, NULL,
228 addr4->addr, addr4->mask);
229 #if IS_ENABLED(CONFIG_IPV6)
230 } else if (addr6 != NULL) {
231 struct netlbl_domaddr6_map *map6;
232 map6 = netlbl_domhsh_addr6_entry(addr6);
233 type = map6->def.type;
234 calipso = map6->def.calipso;
235 netlbl_af6list_audit_addr(audit_buf, 0, NULL,
236 &addr6->addr, &addr6->mask);
239 type = entry->def.type;
240 cipsov4 = entry->def.cipso;
241 calipso = entry->def.calipso;
244 case NETLBL_NLTYPE_UNLABELED:
245 audit_log_format(audit_buf, " nlbl_protocol=unlbl");
247 case NETLBL_NLTYPE_CIPSOV4:
248 BUG_ON(cipsov4 == NULL);
249 audit_log_format(audit_buf,
250 " nlbl_protocol=cipsov4 cipso_doi=%u",
253 case NETLBL_NLTYPE_CALIPSO:
254 BUG_ON(calipso == NULL);
255 audit_log_format(audit_buf,
256 " nlbl_protocol=calipso calipso_doi=%u",
260 audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0);
261 audit_log_end(audit_buf);
266 * netlbl_domhsh_validate - Validate a new domain mapping entry
267 * @entry: the entry to validate
269 * This function validates the new domain mapping entry to ensure that it is
270 * a valid entry. Returns zero on success, negative values on failure.
273 static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry)
275 struct netlbl_af4list *iter4;
276 struct netlbl_domaddr4_map *map4;
277 #if IS_ENABLED(CONFIG_IPV6)
278 struct netlbl_af6list *iter6;
279 struct netlbl_domaddr6_map *map6;
285 if (entry->family != AF_INET && entry->family != AF_INET6 &&
286 (entry->family != AF_UNSPEC ||
287 entry->def.type != NETLBL_NLTYPE_UNLABELED))
290 switch (entry->def.type) {
291 case NETLBL_NLTYPE_UNLABELED:
292 if (entry->def.cipso != NULL || entry->def.calipso != NULL ||
293 entry->def.addrsel != NULL)
296 case NETLBL_NLTYPE_CIPSOV4:
297 if (entry->family != AF_INET ||
298 entry->def.cipso == NULL)
301 case NETLBL_NLTYPE_CALIPSO:
302 if (entry->family != AF_INET6 ||
303 entry->def.calipso == NULL)
306 case NETLBL_NLTYPE_ADDRSELECT:
307 netlbl_af4list_foreach(iter4, &entry->def.addrsel->list4) {
308 map4 = netlbl_domhsh_addr4_entry(iter4);
309 switch (map4->def.type) {
310 case NETLBL_NLTYPE_UNLABELED:
311 if (map4->def.cipso != NULL)
314 case NETLBL_NLTYPE_CIPSOV4:
315 if (map4->def.cipso == NULL)
322 #if IS_ENABLED(CONFIG_IPV6)
323 netlbl_af6list_foreach(iter6, &entry->def.addrsel->list6) {
324 map6 = netlbl_domhsh_addr6_entry(iter6);
325 switch (map6->def.type) {
326 case NETLBL_NLTYPE_UNLABELED:
327 if (map6->def.calipso != NULL)
330 case NETLBL_NLTYPE_CALIPSO:
331 if (map6->def.calipso == NULL)
348 * Domain Hash Table Functions
352 * netlbl_domhsh_init - Init for the domain hash
353 * @size: the number of bits to use for the hash buckets
356 * Initializes the domain hash table, should be called only by
357 * netlbl_user_init() during initialization. Returns zero on success, non-zero
361 int __init netlbl_domhsh_init(u32 size)
364 struct netlbl_domhsh_tbl *hsh_tbl;
369 hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
372 hsh_tbl->size = 1 << size;
373 hsh_tbl->tbl = kcalloc(hsh_tbl->size,
374 sizeof(struct list_head),
376 if (hsh_tbl->tbl == NULL) {
380 for (iter = 0; iter < hsh_tbl->size; iter++)
381 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
383 spin_lock(&netlbl_domhsh_lock);
384 rcu_assign_pointer(netlbl_domhsh, hsh_tbl);
385 spin_unlock(&netlbl_domhsh_lock);
391 * netlbl_domhsh_add - Adds a entry to the domain hash table
392 * @entry: the entry to add
393 * @audit_info: NetLabel audit information
396 * Adds a new entry to the domain hash table and handles any updates to the
397 * lower level protocol handler (i.e. CIPSO). @entry->family may be set to
398 * %AF_UNSPEC which will add an entry that matches all address families. This
399 * is only useful for the unlabelled type and will only succeed if there is no
400 * existing entry for any address family with the same domain. Returns zero
401 * on success, negative on failure.
404 int netlbl_domhsh_add(struct netlbl_dom_map *entry,
405 struct netlbl_audit *audit_info)
408 struct netlbl_dom_map *entry_old, *entry_b;
409 struct netlbl_af4list *iter4;
410 struct netlbl_af4list *tmp4;
411 #if IS_ENABLED(CONFIG_IPV6)
412 struct netlbl_af6list *iter6;
413 struct netlbl_af6list *tmp6;
416 ret_val = netlbl_domhsh_validate(entry);
420 /* XXX - we can remove this RCU read lock as the spinlock protects the
421 * entire function, but before we do we need to fixup the
422 * netlbl_af[4,6]list RCU functions to do "the right thing" with
423 * respect to rcu_dereference() when only a spinlock is held. */
425 spin_lock(&netlbl_domhsh_lock);
426 if (entry->domain != NULL)
427 entry_old = netlbl_domhsh_search(entry->domain, entry->family);
429 entry_old = netlbl_domhsh_search_def(entry->domain,
431 if (entry_old == NULL) {
434 if (entry->domain != NULL) {
435 u32 bkt = netlbl_domhsh_hash(entry->domain);
436 list_add_tail_rcu(&entry->list,
437 &rcu_dereference(netlbl_domhsh)->tbl[bkt]);
439 INIT_LIST_HEAD(&entry->list);
440 switch (entry->family) {
442 rcu_assign_pointer(netlbl_domhsh_def_ipv4,
446 rcu_assign_pointer(netlbl_domhsh_def_ipv6,
450 if (entry->def.type !=
451 NETLBL_NLTYPE_UNLABELED) {
455 entry_b = kzalloc(sizeof(*entry_b), GFP_ATOMIC);
456 if (entry_b == NULL) {
460 entry_b->family = AF_INET6;
461 entry_b->def.type = NETLBL_NLTYPE_UNLABELED;
463 entry->family = AF_INET;
464 rcu_assign_pointer(netlbl_domhsh_def_ipv4,
466 rcu_assign_pointer(netlbl_domhsh_def_ipv6,
470 /* Already checked in
471 * netlbl_domhsh_validate(). */
477 if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
478 netlbl_af4list_foreach_rcu(iter4,
479 &entry->def.addrsel->list4)
480 netlbl_domhsh_audit_add(entry, iter4, NULL,
481 ret_val, audit_info);
482 #if IS_ENABLED(CONFIG_IPV6)
483 netlbl_af6list_foreach_rcu(iter6,
484 &entry->def.addrsel->list6)
485 netlbl_domhsh_audit_add(entry, NULL, iter6,
486 ret_val, audit_info);
489 netlbl_domhsh_audit_add(entry, NULL, NULL,
490 ret_val, audit_info);
491 } else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT &&
492 entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
493 struct list_head *old_list4;
494 struct list_head *old_list6;
496 old_list4 = &entry_old->def.addrsel->list4;
497 old_list6 = &entry_old->def.addrsel->list6;
499 /* we only allow the addition of address selectors if all of
500 * the selectors do not exist in the existing domain map */
501 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4)
502 if (netlbl_af4list_search_exact(iter4->addr,
508 #if IS_ENABLED(CONFIG_IPV6)
509 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6)
510 if (netlbl_af6list_search_exact(&iter6->addr,
518 netlbl_af4list_foreach_safe(iter4, tmp4,
519 &entry->def.addrsel->list4) {
520 netlbl_af4list_remove_entry(iter4);
522 ret_val = netlbl_af4list_add(iter4, old_list4);
523 netlbl_domhsh_audit_add(entry_old, iter4, NULL,
524 ret_val, audit_info);
528 #if IS_ENABLED(CONFIG_IPV6)
529 netlbl_af6list_foreach_safe(iter6, tmp6,
530 &entry->def.addrsel->list6) {
531 netlbl_af6list_remove_entry(iter6);
533 ret_val = netlbl_af6list_add(iter6, old_list6);
534 netlbl_domhsh_audit_add(entry_old, NULL, iter6,
535 ret_val, audit_info);
540 /* cleanup the new entry since we've moved everything over */
541 netlbl_domhsh_free_entry(&entry->rcu);
546 spin_unlock(&netlbl_domhsh_lock);
552 * netlbl_domhsh_add_default - Adds the default entry to the domain hash table
553 * @entry: the entry to add
554 * @audit_info: NetLabel audit information
557 * Adds a new default entry to the domain hash table and handles any updates
558 * to the lower level protocol handler (i.e. CIPSO). Returns zero on success,
559 * negative on failure.
562 int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
563 struct netlbl_audit *audit_info)
565 return netlbl_domhsh_add(entry, audit_info);
569 * netlbl_domhsh_remove_entry - Removes a given entry from the domain table
570 * @entry: the entry to remove
571 * @audit_info: NetLabel audit information
574 * Removes an entry from the domain hash table and handles any updates to the
575 * lower level protocol handler (i.e. CIPSO). Caller is responsible for
576 * ensuring that the RCU read lock is held. Returns zero on success, negative
580 int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
581 struct netlbl_audit *audit_info)
584 struct audit_buffer *audit_buf;
585 struct netlbl_af4list *iter4;
586 struct netlbl_domaddr4_map *map4;
587 #if IS_ENABLED(CONFIG_IPV6)
588 struct netlbl_af6list *iter6;
589 struct netlbl_domaddr6_map *map6;
595 spin_lock(&netlbl_domhsh_lock);
598 if (entry == rcu_dereference(netlbl_domhsh_def_ipv4))
599 RCU_INIT_POINTER(netlbl_domhsh_def_ipv4, NULL);
600 else if (entry == rcu_dereference(netlbl_domhsh_def_ipv6))
601 RCU_INIT_POINTER(netlbl_domhsh_def_ipv6, NULL);
603 list_del_rcu(&entry->list);
606 spin_unlock(&netlbl_domhsh_lock);
611 audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info);
612 if (audit_buf != NULL) {
613 audit_log_format(audit_buf,
614 " nlbl_domain=%s res=%u",
615 entry->domain ? entry->domain : "(default)",
616 ret_val == 0 ? 1 : 0);
617 audit_log_end(audit_buf);
620 switch (entry->def.type) {
621 case NETLBL_NLTYPE_ADDRSELECT:
622 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) {
623 map4 = netlbl_domhsh_addr4_entry(iter4);
624 cipso_v4_doi_putdef(map4->def.cipso);
626 #if IS_ENABLED(CONFIG_IPV6)
627 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
628 map6 = netlbl_domhsh_addr6_entry(iter6);
629 calipso_doi_putdef(map6->def.calipso);
633 case NETLBL_NLTYPE_CIPSOV4:
634 cipso_v4_doi_putdef(entry->def.cipso);
636 #if IS_ENABLED(CONFIG_IPV6)
637 case NETLBL_NLTYPE_CALIPSO:
638 calipso_doi_putdef(entry->def.calipso);
642 call_rcu(&entry->rcu, netlbl_domhsh_free_entry);
648 * netlbl_domhsh_remove_af4 - Removes an address selector entry
649 * @domain: the domain
650 * @addr: IPv4 address
651 * @mask: IPv4 address mask
652 * @audit_info: NetLabel audit information
655 * Removes an individual address selector from a domain mapping and potentially
656 * the entire mapping if it is empty. Returns zero on success, negative values
660 int netlbl_domhsh_remove_af4(const char *domain,
661 const struct in_addr *addr,
662 const struct in_addr *mask,
663 struct netlbl_audit *audit_info)
665 struct netlbl_dom_map *entry_map;
666 struct netlbl_af4list *entry_addr;
667 struct netlbl_af4list *iter4;
668 #if IS_ENABLED(CONFIG_IPV6)
669 struct netlbl_af6list *iter6;
671 struct netlbl_domaddr4_map *entry;
676 entry_map = netlbl_domhsh_search(domain, AF_INET);
678 entry_map = netlbl_domhsh_search_def(domain, AF_INET);
679 if (entry_map == NULL ||
680 entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT)
681 goto remove_af4_failure;
683 spin_lock(&netlbl_domhsh_lock);
684 entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
685 &entry_map->def.addrsel->list4);
686 spin_unlock(&netlbl_domhsh_lock);
688 if (entry_addr == NULL)
689 goto remove_af4_failure;
690 netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4)
691 goto remove_af4_single_addr;
692 #if IS_ENABLED(CONFIG_IPV6)
693 netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6)
694 goto remove_af4_single_addr;
696 /* the domain mapping is empty so remove it from the mapping table */
697 netlbl_domhsh_remove_entry(entry_map, audit_info);
699 remove_af4_single_addr:
701 /* yick, we can't use call_rcu here because we don't have a rcu head
702 * pointer but hopefully this should be a rare case so the pause
703 * shouldn't be a problem */
705 entry = netlbl_domhsh_addr4_entry(entry_addr);
706 cipso_v4_doi_putdef(entry->def.cipso);
715 #if IS_ENABLED(CONFIG_IPV6)
717 * netlbl_domhsh_remove_af6 - Removes an address selector entry
718 * @domain: the domain
719 * @addr: IPv6 address
720 * @mask: IPv6 address mask
721 * @audit_info: NetLabel audit information
724 * Removes an individual address selector from a domain mapping and potentially
725 * the entire mapping if it is empty. Returns zero on success, negative values
729 int netlbl_domhsh_remove_af6(const char *domain,
730 const struct in6_addr *addr,
731 const struct in6_addr *mask,
732 struct netlbl_audit *audit_info)
734 struct netlbl_dom_map *entry_map;
735 struct netlbl_af6list *entry_addr;
736 struct netlbl_af4list *iter4;
737 struct netlbl_af6list *iter6;
738 struct netlbl_domaddr6_map *entry;
743 entry_map = netlbl_domhsh_search(domain, AF_INET6);
745 entry_map = netlbl_domhsh_search_def(domain, AF_INET6);
746 if (entry_map == NULL ||
747 entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT)
748 goto remove_af6_failure;
750 spin_lock(&netlbl_domhsh_lock);
751 entry_addr = netlbl_af6list_remove(addr, mask,
752 &entry_map->def.addrsel->list6);
753 spin_unlock(&netlbl_domhsh_lock);
755 if (entry_addr == NULL)
756 goto remove_af6_failure;
757 netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4)
758 goto remove_af6_single_addr;
759 netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6)
760 goto remove_af6_single_addr;
761 /* the domain mapping is empty so remove it from the mapping table */
762 netlbl_domhsh_remove_entry(entry_map, audit_info);
764 remove_af6_single_addr:
766 /* yick, we can't use call_rcu here because we don't have a rcu head
767 * pointer but hopefully this should be a rare case so the pause
768 * shouldn't be a problem */
770 entry = netlbl_domhsh_addr6_entry(entry_addr);
771 calipso_doi_putdef(entry->def.calipso);
782 * netlbl_domhsh_remove - Removes an entry from the domain hash table
783 * @domain: the domain to remove
784 * @family: address family
785 * @audit_info: NetLabel audit information
788 * Removes an entry from the domain hash table and handles any updates to the
789 * lower level protocol handler (i.e. CIPSO). @family may be %AF_UNSPEC which
790 * removes all address family entries. Returns zero on success, negative on
794 int netlbl_domhsh_remove(const char *domain, u16 family,
795 struct netlbl_audit *audit_info)
797 int ret_val = -EINVAL;
798 struct netlbl_dom_map *entry;
802 if (family == AF_INET || family == AF_UNSPEC) {
804 entry = netlbl_domhsh_search(domain, AF_INET);
806 entry = netlbl_domhsh_search_def(domain, AF_INET);
807 ret_val = netlbl_domhsh_remove_entry(entry, audit_info);
808 if (ret_val && ret_val != -ENOENT)
811 if (family == AF_INET6 || family == AF_UNSPEC) {
815 entry = netlbl_domhsh_search(domain, AF_INET6);
817 entry = netlbl_domhsh_search_def(domain, AF_INET6);
818 ret_val2 = netlbl_domhsh_remove_entry(entry, audit_info);
819 if (ret_val2 != -ENOENT)
829 * netlbl_domhsh_remove_default - Removes the default entry from the table
830 * @family: address family
831 * @audit_info: NetLabel audit information
834 * Removes/resets the default entry corresponding to @family from the domain
835 * hash table and handles any updates to the lower level protocol handler
836 * (i.e. CIPSO). @family may be %AF_UNSPEC which removes all address family
837 * entries. Returns zero on success, negative on failure.
840 int netlbl_domhsh_remove_default(u16 family, struct netlbl_audit *audit_info)
842 return netlbl_domhsh_remove(NULL, family, audit_info);
846 * netlbl_domhsh_getentry - Get an entry from the domain hash table
847 * @domain: the domain name to search for
848 * @family: address family
851 * Look through the domain hash table searching for an entry to match @domain,
852 * with address family @family, return a pointer to a copy of the entry or
853 * NULL. The caller is responsible for ensuring that rcu_read_[un]lock() is
857 struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain, u16 family)
859 if (family == AF_UNSPEC)
861 return netlbl_domhsh_search_def(domain, family);
865 * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table
866 * @domain: the domain name to search for
867 * @addr: the IP address to search for
870 * Look through the domain hash table searching for an entry to match @domain
871 * and @addr, return a pointer to a copy of the entry or NULL. The caller is
872 * responsible for ensuring that rcu_read_[un]lock() is called.
875 struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain,
878 struct netlbl_dom_map *dom_iter;
879 struct netlbl_af4list *addr_iter;
881 dom_iter = netlbl_domhsh_search_def(domain, AF_INET);
882 if (dom_iter == NULL)
885 if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT)
886 return &dom_iter->def;
887 addr_iter = netlbl_af4list_search(addr, &dom_iter->def.addrsel->list4);
888 if (addr_iter == NULL)
890 return &(netlbl_domhsh_addr4_entry(addr_iter)->def);
893 #if IS_ENABLED(CONFIG_IPV6)
895 * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table
896 * @domain: the domain name to search for
897 * @addr: the IP address to search for
900 * Look through the domain hash table searching for an entry to match @domain
901 * and @addr, return a pointer to a copy of the entry or NULL. The caller is
902 * responsible for ensuring that rcu_read_[un]lock() is called.
905 struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain,
906 const struct in6_addr *addr)
908 struct netlbl_dom_map *dom_iter;
909 struct netlbl_af6list *addr_iter;
911 dom_iter = netlbl_domhsh_search_def(domain, AF_INET6);
912 if (dom_iter == NULL)
915 if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT)
916 return &dom_iter->def;
917 addr_iter = netlbl_af6list_search(addr, &dom_iter->def.addrsel->list6);
918 if (addr_iter == NULL)
920 return &(netlbl_domhsh_addr6_entry(addr_iter)->def);
925 * netlbl_domhsh_walk - Iterate through the domain mapping hash table
926 * @skip_bkt: the number of buckets to skip at the start
927 * @skip_chain: the number of entries to skip in the first iterated bucket
928 * @callback: callback for each entry
929 * @cb_arg: argument for the callback function
932 * Interate over the domain mapping hash table, skipping the first @skip_bkt
933 * buckets and @skip_chain entries. For each entry in the table call
934 * @callback, if @callback returns a negative value stop 'walking' through the
935 * table and return. Updates the values in @skip_bkt and @skip_chain on
936 * return. Returns zero on success, negative values on failure.
939 int netlbl_domhsh_walk(u32 *skip_bkt,
941 int (*callback) (struct netlbl_dom_map *entry, void *arg),
944 int ret_val = -ENOENT;
946 struct list_head *iter_list;
947 struct netlbl_dom_map *iter_entry;
951 for (iter_bkt = *skip_bkt;
952 iter_bkt < rcu_dereference(netlbl_domhsh)->size;
953 iter_bkt++, chain_cnt = 0) {
954 iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt];
955 list_for_each_entry_rcu(iter_entry, iter_list, list)
956 if (iter_entry->valid) {
957 if (chain_cnt++ < *skip_chain)
959 ret_val = callback(iter_entry, cb_arg);
969 *skip_bkt = iter_bkt;
970 *skip_chain = chain_cnt;