/* * NetLabel Domain Hash Table * * This file manages the domain hash table that NetLabel uses to determine * which network labeling protocol to use for a given domain. The NetLabel * system manages static and dynamic label mappings for network protocols such * as CIPSO and RIPSO. * * Author: Paul Moore <paul@paul-moore.com> * */ /* * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. * */ #include <linux/types.h> #include <linux/rculist.h> #include <linux/skbuff.h> #include <linux/spinlock.h> #include <linux/string.h> #include <linux/audit.h> #include <linux/slab.h> #include <net/netlabel.h> #include <net/cipso_ipv4.h> #include <net/calipso.h> #include <asm/bug.h> #include "netlabel_mgmt.h" #include "netlabel_addrlist.h" #include "netlabel_calipso.h" #include "netlabel_domainhash.h" #include "netlabel_user.h" struct netlbl_domhsh_tbl { struct list_head *tbl; u32 size; }; /* Domain hash table */ /* updates should be so rare that having one spinlock for the entire hash table * should be okay */ static DEFINE_SPINLOCK(netlbl_domhsh_lock); #define netlbl_domhsh_rcu_deref(p) \ rcu_dereference_check(p, lockdep_is_held(&netlbl_domhsh_lock)) static struct netlbl_domhsh_tbl __rcu *netlbl_domhsh; static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv4; static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv6; /* * Domain Hash Table Helper Functions */ /** * netlbl_domhsh_free_entry - Frees a domain hash table entry * @entry: the entry's RCU field * * Description: * This function is designed to be used as a callback to the call_rcu() * function so that the memory allocated to a hash table entry can be released * safely. * */ static void netlbl_domhsh_free_entry(struct rcu_head *entry) { struct netlbl_dom_map *ptr; struct netlbl_af4list *iter4; struct netlbl_af4list *tmp4; #if IS_ENABLED(CONFIG_IPV6) struct netlbl_af6list *iter6; struct netlbl_af6list *tmp6; #endif /* IPv6 */ ptr = container_of(entry, struct netlbl_dom_map, rcu); if (ptr->def.type == NETLBL_NLTYPE_ADDRSELECT) { netlbl_af4list_foreach_safe(iter4, tmp4, &ptr->def.addrsel->list4) { netlbl_af4list_remove_entry(iter4); kfree(netlbl_domhsh_addr4_entry(iter4)); } #if IS_ENABLED(CONFIG_IPV6) netlbl_af6list_foreach_safe(iter6, tmp6, &ptr->def.addrsel->list6) { netlbl_af6list_remove_entry(iter6); kfree(netlbl_domhsh_addr6_entry(iter6)); } #endif /* IPv6 */ } kfree(ptr->domain); kfree(ptr); } /** * netlbl_domhsh_hash - Hashing function for the domain hash table * @domain: the domain name to hash * * Description: * This is the hashing function for the domain hash table, it returns the * correct bucket number for the domain. The caller is responsible for * ensuring that the hash table is protected with either a RCU read lock or the * hash table lock. * */ static u32 netlbl_domhsh_hash(const char *key) { u32 iter; u32 val; u32 len; /* This is taken (with slight modification) from * security/selinux/ss/symtab.c:symhash() */ for (iter = 0, val = 0, len = strlen(key); iter < len; iter++) val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter]; return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1); } static bool netlbl_family_match(u16 f1, u16 f2) { return (f1 == f2) || (f1 == AF_UNSPEC) || (f2 == AF_UNSPEC); } /** * netlbl_domhsh_search - Search for a domain entry * @domain: the domain * @family: the address family * * Description: * Searches the domain hash table and returns a pointer to the hash table * entry if found, otherwise NULL is returned. @family may be %AF_UNSPEC * which matches any address family entries. The caller is responsible for * ensuring that the hash table is protected with either a RCU read lock or the * hash table lock. * */ static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain, u16 family) { u32 bkt; struct list_head *bkt_list; struct netlbl_dom_map *iter; if (domain != NULL) { bkt = netlbl_domhsh_hash(domain); bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt]; list_for_each_entry_rcu(iter, bkt_list, list) if (iter->valid && netlbl_family_match(iter->family, family) && strcmp(iter->domain, domain) == 0) return iter; } return NULL; } /** * netlbl_domhsh_search_def - Search for a domain entry * @domain: the domain * @family: the address family * * Description: * Searches the domain hash table and returns a pointer to the hash table * entry if an exact match is found, if an exact match is not present in the * hash table then the default entry is returned if valid otherwise NULL is * returned. @family may be %AF_UNSPEC which matches any address family * entries. The caller is responsible ensuring that the hash table is * protected with either a RCU read lock or the hash table lock. * */ static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain, u16 family) { struct netlbl_dom_map *entry; entry = netlbl_domhsh_search(domain, family); if (entry != NULL) return entry; if (family == AF_INET || family == AF_UNSPEC) { entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv4); if (entry != NULL && entry->valid) return entry; } if (family == AF_INET6 || family == AF_UNSPEC) { entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv6); if (entry != NULL && entry->valid) return entry; } return NULL; } /** * netlbl_domhsh_audit_add - Generate an audit entry for an add event * @entry: the entry being added * @addr4: the IPv4 address information * @addr6: the IPv6 address information * @result: the result code * @audit_info: NetLabel audit information * * Description: * Generate an audit record for adding a new NetLabel/LSM mapping entry with * the given information. Caller is responsible for holding the necessary * locks. * */ static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry, struct netlbl_af4list *addr4, struct netlbl_af6list *addr6, int result, struct netlbl_audit *audit_info) { struct audit_buffer *audit_buf; struct cipso_v4_doi *cipsov4 = NULL; struct calipso_doi *calipso = NULL; u32 type; audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info); if (audit_buf != NULL) { audit_log_format(audit_buf, " nlbl_domain=%s", entry->domain ? entry->domain : "(default)"); if (addr4 != NULL) { struct netlbl_domaddr4_map *map4; map4 = netlbl_domhsh_addr4_entry(addr4); type = map4->def.type; cipsov4 = map4->def.cipso; netlbl_af4list_audit_addr(audit_buf, 0, NULL, addr4->addr, addr4->mask); #if IS_ENABLED(CONFIG_IPV6) } else if (addr6 != NULL) { struct netlbl_domaddr6_map *map6; map6 = netlbl_domhsh_addr6_entry(addr6); type = map6->def.type; calipso = map6->def.calipso; netlbl_af6list_audit_addr(audit_buf, 0, NULL, &addr6->addr, &addr6->mask); #endif /* IPv6 */ } else { type = entry->def.type; cipsov4 = entry->def.cipso; calipso = entry->def.calipso; } switch (type) { case NETLBL_NLTYPE_UNLABELED: audit_log_format(audit_buf, " nlbl_protocol=unlbl"); break; case NETLBL_NLTYPE_CIPSOV4: BUG_ON(cipsov4 == NULL); audit_log_format(audit_buf, " nlbl_protocol=cipsov4 cipso_doi=%u", cipsov4->doi); break; case NETLBL_NLTYPE_CALIPSO: BUG_ON(calipso == NULL); audit_log_format(audit_buf, " nlbl_protocol=calipso calipso_doi=%u", calipso->doi); break; } audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0); audit_log_end(audit_buf); } } /** * netlbl_domhsh_validate - Validate a new domain mapping entry * @entry: the entry to validate * * This function validates the new domain mapping entry to ensure that it is * a valid entry. Returns zero on success, negative values on failure. * */ static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry) { struct netlbl_af4list *iter4; struct netlbl_domaddr4_map *map4; #if IS_ENABLED(CONFIG_IPV6) struct netlbl_af6list *iter6; struct netlbl_domaddr6_map *map6; #endif /* IPv6 */ if (entry == NULL) return -EINVAL; if (entry->family != AF_INET && entry->family != AF_INET6 && (entry->family != AF_UNSPEC || entry->def.type != NETLBL_NLTYPE_UNLABELED)) return -EINVAL; switch (entry->def.type) { case NETLBL_NLTYPE_UNLABELED: if (entry->def.cipso != NULL || entry->def.calipso != NULL || entry->def.addrsel != NULL) return -EINVAL; break; case NETLBL_NLTYPE_CIPSOV4: if (entry->family != AF_INET || entry->def.cipso == NULL) return -EINVAL; break; case NETLBL_NLTYPE_CALIPSO: if (entry->family != AF_INET6 || entry->def.calipso == NULL) return -EINVAL; break; case NETLBL_NLTYPE_ADDRSELECT: netlbl_af4list_foreach(iter4, &entry->def.addrsel->list4) { map4 = netlbl_domhsh_addr4_entry(iter4); switch (map4->def.type) { case NETLBL_NLTYPE_UNLABELED: if (map4->def.cipso != NULL) return -EINVAL; break; case NETLBL_NLTYPE_CIPSOV4: if (map4->def.cipso == NULL) return -EINVAL; break; default: return -EINVAL; } } #if IS_ENABLED(CONFIG_IPV6) netlbl_af6list_foreach(iter6, &entry->def.addrsel->list6) { map6 = netlbl_domhsh_addr6_entry(iter6); switch (map6->def.type) { case NETLBL_NLTYPE_UNLABELED: if (map6->def.calipso != NULL) return -EINVAL; break; case NETLBL_NLTYPE_CALIPSO: if (map6->def.calipso == NULL) return -EINVAL; break; default: return -EINVAL; } } #endif /* IPv6 */ break; default: return -EINVAL; } return 0; } /* * Domain Hash Table Functions */ /** * netlbl_domhsh_init - Init for the domain hash * @size: the number of bits to use for the hash buckets * * Description: * Initializes the domain hash table, should be called only by * netlbl_user_init() during initialization. Returns zero on success, non-zero * values on error. * */ int __init netlbl_domhsh_init(u32 size) { u32 iter; struct netlbl_domhsh_tbl *hsh_tbl; if (size == 0) return -EINVAL; hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); if (hsh_tbl == NULL) return -ENOMEM; hsh_tbl->size = 1 << size; hsh_tbl->tbl = kcalloc(hsh_tbl->size, sizeof(struct list_head), GFP_KERNEL); if (hsh_tbl->tbl == NULL) { kfree(hsh_tbl); return -ENOMEM; } for (iter = 0; iter < hsh_tbl->size; iter++) INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); spin_lock(&netlbl_domhsh_lock); rcu_assign_pointer(netlbl_domhsh, hsh_tbl); spin_unlock(&netlbl_domhsh_lock); return 0; } /** * netlbl_domhsh_add - Adds a entry to the domain hash table * @entry: the entry to add * @audit_info: NetLabel audit information * * Description: * Adds a new entry to the domain hash table and handles any updates to the * lower level protocol handler (i.e. CIPSO). @entry->family may be set to * %AF_UNSPEC which will add an entry that matches all address families. This * is only useful for the unlabelled type and will only succeed if there is no * existing entry for any address family with the same domain. Returns zero * on success, negative on failure. * */ int netlbl_domhsh_add(struct netlbl_dom_map *entry, struct netlbl_audit *audit_info) { int ret_val = 0; struct netlbl_dom_map *entry_old, *entry_b; struct netlbl_af4list *iter4; struct netlbl_af4list *tmp4; #if IS_ENABLED(CONFIG_IPV6) struct netlbl_af6list *iter6; struct netlbl_af6list *tmp6; #endif /* IPv6 */ ret_val = netlbl_domhsh_validate(entry); if (ret_val != 0) return ret_val; /* XXX - we can remove this RCU read lock as the spinlock protects the * entire function, but before we do we need to fixup the * netlbl_af[4,6]list RCU functions to do "the right thing" with * respect to rcu_dereference() when only a spinlock is held. */ rcu_read_lock(); spin_lock(&netlbl_domhsh_lock); if (entry->domain != NULL) entry_old = netlbl_domhsh_search(entry->domain, entry->family); else entry_old = netlbl_domhsh_search_def(entry->domain, entry->family); if (entry_old == NULL) { entry->valid = 1; if (entry->domain != NULL) { u32 bkt = netlbl_domhsh_hash(entry->domain); list_add_tail_rcu(&entry->list, &rcu_dereference(netlbl_domhsh)->tbl[bkt]); } else { INIT_LIST_HEAD(&entry->list); switch (entry->family) { case AF_INET: rcu_assign_pointer(netlbl_domhsh_def_ipv4, entry); break; case AF_INET6: rcu_assign_pointer(netlbl_domhsh_def_ipv6, entry); break; case AF_UNSPEC: if (entry->def.type != NETLBL_NLTYPE_UNLABELED) { ret_val = -EINVAL; goto add_return; } entry_b = kzalloc(sizeof(*entry_b), GFP_ATOMIC); if (entry_b == NULL) { ret_val = -ENOMEM; goto add_return; } entry_b->family = AF_INET6; entry_b->def.type = NETLBL_NLTYPE_UNLABELED; entry_b->valid = 1; entry->family = AF_INET; rcu_assign_pointer(netlbl_domhsh_def_ipv4, entry); rcu_assign_pointer(netlbl_domhsh_def_ipv6, entry_b); break; default: /* Already checked in * netlbl_domhsh_validate(). */ ret_val = -EINVAL; goto add_return; } } if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) netlbl_domhsh_audit_add(entry, iter4, NULL, ret_val, audit_info); #if IS_ENABLED(CONFIG_IPV6) netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) netlbl_domhsh_audit_add(entry, NULL, iter6, ret_val, audit_info); #endif /* IPv6 */ } else netlbl_domhsh_audit_add(entry, NULL, NULL, ret_val, audit_info); } else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT && entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { struct list_head *old_list4; struct list_head *old_list6; old_list4 = &entry_old->def.addrsel->list4; old_list6 = &entry_old->def.addrsel->list6; /* we only allow the addition of address selectors if all of * the selectors do not exist in the existing domain map */ netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) if (netlbl_af4list_search_exact(iter4->addr, iter4->mask, old_list4)) { ret_val = -EEXIST; goto add_return; } #if IS_ENABLED(CONFIG_IPV6) netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) if (netlbl_af6list_search_exact(&iter6->addr, &iter6->mask, old_list6)) { ret_val = -EEXIST; goto add_return; } #endif /* IPv6 */ netlbl_af4list_foreach_safe(iter4, tmp4, &entry->def.addrsel->list4) { netlbl_af4list_remove_entry(iter4); iter4->valid = 1; ret_val = netlbl_af4list_add(iter4, old_list4); netlbl_domhsh_audit_add(entry_old, iter4, NULL, ret_val, audit_info); if (ret_val != 0) goto add_return; } #if IS_ENABLED(CONFIG_IPV6) netlbl_af6list_foreach_safe(iter6, tmp6, &entry->def.addrsel->list6) { netlbl_af6list_remove_entry(iter6); iter6->valid = 1; ret_val = netlbl_af6list_add(iter6, old_list6); netlbl_domhsh_audit_add(entry_old, NULL, iter6, ret_val, audit_info); if (ret_val != 0) goto add_return; } #endif /* IPv6 */ } else ret_val = -EINVAL; add_return: spin_unlock(&netlbl_domhsh_lock); rcu_read_unlock(); return ret_val; } /** * netlbl_domhsh_add_default - Adds the default entry to the domain hash table * @entry: the entry to add * @audit_info: NetLabel audit information * * Description: * Adds a new default entry to the domain hash table and handles any updates * to the lower level protocol handler (i.e. CIPSO). Returns zero on success, * negative on failure. * */ int netlbl_domhsh_add_default(struct netlbl_dom_map *entry, struct netlbl_audit *audit_info) { return netlbl_domhsh_add(entry, audit_info); } /** * netlbl_domhsh_remove_entry - Removes a given entry from the domain table * @entry: the entry to remove * @audit_info: NetLabel audit information * * Description: * Removes an entry from the domain hash table and handles any updates to the * lower level protocol handler (i.e. CIPSO). Caller is responsible for * ensuring that the RCU read lock is held. Returns zero on success, negative * on failure. * */ int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry, struct netlbl_audit *audit_info) { int ret_val = 0; struct audit_buffer *audit_buf; if (entry == NULL) return -ENOENT; spin_lock(&netlbl_domhsh_lock); if (entry->valid) { entry->valid = 0; if (entry == rcu_dereference(netlbl_domhsh_def_ipv4)) RCU_INIT_POINTER(netlbl_domhsh_def_ipv4, NULL); else if (entry == rcu_dereference(netlbl_domhsh_def_ipv6)) RCU_INIT_POINTER(netlbl_domhsh_def_ipv6, NULL); else list_del_rcu(&entry->list); } else ret_val = -ENOENT; spin_unlock(&netlbl_domhsh_lock); audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info); if (audit_buf != NULL) { audit_log_format(audit_buf, " nlbl_domain=%s res=%u", entry->domain ? entry->domain : "(default)", ret_val == 0 ? 1 : 0); audit_log_end(audit_buf); } if (ret_val == 0) { struct netlbl_af4list *iter4; struct netlbl_domaddr4_map *map4; #if IS_ENABLED(CONFIG_IPV6) struct netlbl_af6list *iter6; struct netlbl_domaddr6_map *map6; #endif /* IPv6 */ switch (entry->def.type) { case NETLBL_NLTYPE_ADDRSELECT: netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) { map4 = netlbl_domhsh_addr4_entry(iter4); cipso_v4_doi_putdef(map4->def.cipso); } #if IS_ENABLED(CONFIG_IPV6) netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) { map6 = netlbl_domhsh_addr6_entry(iter6); calipso_doi_putdef(map6->def.calipso); } #endif /* IPv6 */ break; case NETLBL_NLTYPE_CIPSOV4: cipso_v4_doi_putdef(entry->def.cipso); break; #if IS_ENABLED(CONFIG_IPV6) case NETLBL_NLTYPE_CALIPSO: calipso_doi_putdef(entry->def.calipso); break; #endif /* IPv6 */ } call_rcu(&entry->rcu, netlbl_domhsh_free_entry); } return ret_val; } /** * netlbl_domhsh_remove_af4 - Removes an address selector entry * @domain: the domain * @addr: IPv4 address * @mask: IPv4 address mask * @audit_info: NetLabel audit information * * Description: * Removes an individual address selector from a domain mapping and potentially * the entire mapping if it is empty. Returns zero on success, negative values * on failure. * */ int netlbl_domhsh_remove_af4(const char *domain, const struct in_addr *addr, const struct in_addr *mask, struct netlbl_audit *audit_info) { struct netlbl_dom_map *entry_map; struct netlbl_af4list *entry_addr; struct netlbl_af4list *iter4; #if IS_ENABLED(CONFIG_IPV6) struct netlbl_af6list *iter6; #endif /* IPv6 */ struct netlbl_domaddr4_map *entry; rcu_read_lock(); if (domain) entry_map = netlbl_domhsh_search(domain, AF_INET); else entry_map = netlbl_domhsh_search_def(domain, AF_INET); if (entry_map == NULL || entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT) goto remove_af4_failure; spin_lock(&netlbl_domhsh_lock); entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr, &entry_map->def.addrsel->list4); spin_unlock(&netlbl_domhsh_lock); if (entry_addr == NULL) goto remove_af4_failure; netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4) goto remove_af4_single_addr; #if IS_ENABLED(CONFIG_IPV6) netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6) goto remove_af4_single_addr; #endif /* IPv6 */ /* the domain mapping is empty so remove it from the mapping table */ netlbl_domhsh_remove_entry(entry_map, audit_info); remove_af4_single_addr: rcu_read_unlock(); /* yick, we can't use call_rcu here because we don't have a rcu head * pointer but hopefully this should be a rare case so the pause * shouldn't be a problem */ synchronize_rcu(); entry = netlbl_domhsh_addr4_entry(entry_addr); cipso_v4_doi_putdef(entry->def.cipso); kfree(entry); return 0; remove_af4_failure: rcu_read_unlock(); return -ENOENT; } #if IS_ENABLED(CONFIG_IPV6) /** * netlbl_domhsh_remove_af6 - Removes an address selector entry * @domain: the domain * @addr: IPv6 address * @mask: IPv6 address mask * @audit_info: NetLabel audit information * * Description: * Removes an individual address selector from a domain mapping and potentially * the entire mapping if it is empty. Returns zero on success, negative values * on failure. * */ int netlbl_domhsh_remove_af6(const char *domain, const struct in6_addr *addr, const struct in6_addr *mask, struct netlbl_audit *audit_info) { struct netlbl_dom_map *entry_map; struct netlbl_af6list *entry_addr; struct netlbl_af4list *iter4; struct netlbl_af6list *iter6; struct netlbl_domaddr6_map *entry; rcu_read_lock(); if (domain) entry_map = netlbl_domhsh_search(domain, AF_INET6); else entry_map = netlbl_domhsh_search_def(domain, AF_INET6); if (entry_map == NULL || entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT) goto remove_af6_failure; spin_lock(&netlbl_domhsh_lock); entry_addr = netlbl_af6list_remove(addr, mask, &entry_map->def.addrsel->list6); spin_unlock(&netlbl_domhsh_lock); if (entry_addr == NULL) goto remove_af6_failure; netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4) goto remove_af6_single_addr; netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6) goto remove_af6_single_addr; /* the domain mapping is empty so remove it from the mapping table */ netlbl_domhsh_remove_entry(entry_map, audit_info); remove_af6_single_addr: rcu_read_unlock(); /* yick, we can't use call_rcu here because we don't have a rcu head * pointer but hopefully this should be a rare case so the pause * shouldn't be a problem */ synchronize_rcu(); entry = netlbl_domhsh_addr6_entry(entry_addr); calipso_doi_putdef(entry->def.calipso); kfree(entry); return 0; remove_af6_failure: rcu_read_unlock(); return -ENOENT; } #endif /* IPv6 */ /** * netlbl_domhsh_remove - Removes an entry from the domain hash table * @domain: the domain to remove * @family: address family * @audit_info: NetLabel audit information * * Description: * Removes an entry from the domain hash table and handles any updates to the * lower level protocol handler (i.e. CIPSO). @family may be %AF_UNSPEC which * removes all address family entries. Returns zero on success, negative on * failure. * */ int netlbl_domhsh_remove(const char *domain, u16 family, struct netlbl_audit *audit_info) { int ret_val = -EINVAL; struct netlbl_dom_map *entry; rcu_read_lock(); if (family == AF_INET || family == AF_UNSPEC) { if (domain) entry = netlbl_domhsh_search(domain, AF_INET); else entry = netlbl_domhsh_search_def(domain, AF_INET); ret_val = netlbl_domhsh_remove_entry(entry, audit_info); if (ret_val && ret_val != -ENOENT) goto done; } if (family == AF_INET6 || family == AF_UNSPEC) { int ret_val2; if (domain) entry = netlbl_domhsh_search(domain, AF_INET6); else entry = netlbl_domhsh_search_def(domain, AF_INET6); ret_val2 = netlbl_domhsh_remove_entry(entry, audit_info); if (ret_val2 != -ENOENT) ret_val = ret_val2; } done: rcu_read_unlock(); return ret_val; } /** * netlbl_domhsh_remove_default - Removes the default entry from the table * @family: address family * @audit_info: NetLabel audit information * * Description: * Removes/resets the default entry corresponding to @family from the domain * hash table and handles any updates to the lower level protocol handler * (i.e. CIPSO). @family may be %AF_UNSPEC which removes all address family * entries. Returns zero on success, negative on failure. * */ int netlbl_domhsh_remove_default(u16 family, struct netlbl_audit *audit_info) { return netlbl_domhsh_remove(NULL, family, audit_info); } /** * netlbl_domhsh_getentry - Get an entry from the domain hash table * @domain: the domain name to search for * @family: address family * * Description: * Look through the domain hash table searching for an entry to match @domain, * with address family @family, return a pointer to a copy of the entry or * NULL. The caller is responsible for ensuring that rcu_read_[un]lock() is * called. * */ struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain, u16 family) { if (family == AF_UNSPEC) return NULL; return netlbl_domhsh_search_def(domain, family); } /** * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table * @domain: the domain name to search for * @addr: the IP address to search for * * Description: * Look through the domain hash table searching for an entry to match @domain * and @addr, return a pointer to a copy of the entry or NULL. The caller is * responsible for ensuring that rcu_read_[un]lock() is called. * */ struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain, __be32 addr) { struct netlbl_dom_map *dom_iter; struct netlbl_af4list *addr_iter; dom_iter = netlbl_domhsh_search_def(domain, AF_INET); if (dom_iter == NULL) return NULL; if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT) return &dom_iter->def; addr_iter = netlbl_af4list_search(addr, &dom_iter->def.addrsel->list4); if (addr_iter == NULL) return NULL; return &(netlbl_domhsh_addr4_entry(addr_iter)->def); } #if IS_ENABLED(CONFIG_IPV6) /** * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table * @domain: the domain name to search for * @addr: the IP address to search for * * Description: * Look through the domain hash table searching for an entry to match @domain * and @addr, return a pointer to a copy of the entry or NULL. The caller is * responsible for ensuring that rcu_read_[un]lock() is called. * */ struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain, const struct in6_addr *addr) { struct netlbl_dom_map *dom_iter; struct netlbl_af6list *addr_iter; dom_iter = netlbl_domhsh_search_def(domain, AF_INET6); if (dom_iter == NULL) return NULL; if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT) return &dom_iter->def; addr_iter = netlbl_af6list_search(addr, &dom_iter->def.addrsel->list6); if (addr_iter == NULL) return NULL; return &(netlbl_domhsh_addr6_entry(addr_iter)->def); } #endif /* IPv6 */ /** * netlbl_domhsh_walk - Iterate through the domain mapping hash table * @skip_bkt: the number of buckets to skip at the start * @skip_chain: the number of entries to skip in the first iterated bucket * @callback: callback for each entry * @cb_arg: argument for the callback function * * Description: * Interate over the domain mapping hash table, skipping the first @skip_bkt * buckets and @skip_chain entries. For each entry in the table call * @callback, if @callback returns a negative value stop 'walking' through the * table and return. Updates the values in @skip_bkt and @skip_chain on * return. Returns zero on success, negative values on failure. * */ int netlbl_domhsh_walk(u32 *skip_bkt, u32 *skip_chain, int (*callback) (struct netlbl_dom_map *entry, void *arg), void *cb_arg) { int ret_val = -ENOENT; u32 iter_bkt; struct list_head *iter_list; struct netlbl_dom_map *iter_entry; u32 chain_cnt = 0; rcu_read_lock(); for (iter_bkt = *skip_bkt; iter_bkt < rcu_dereference(netlbl_domhsh)->size; iter_bkt++, chain_cnt = 0) { iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt]; list_for_each_entry_rcu(iter_entry, iter_list, list) if (iter_entry->valid) { if (chain_cnt++ < *skip_chain) continue; ret_val = callback(iter_entry, cb_arg); if (ret_val < 0) { chain_cnt--; goto walk_return; } } } walk_return: rcu_read_unlock(); *skip_bkt = iter_bkt; *skip_chain = chain_cnt; return ret_val; }