| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * 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 |
| */ |
| |
| #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->def.addrsel); |
| } |
| kfree(ptr->domain); |
| kfree(ptr); |
| } |
| |
| /** |
| * netlbl_domhsh_hash - Hashing function for the domain hash table |
| * @key: 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, |
| lockdep_is_held(&netlbl_domhsh_lock)) |
| 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 */ |
| /* cleanup the new entry since we've moved everything over */ |
| netlbl_domhsh_free_entry(&entry->rcu); |
| } 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; |
| 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 -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); |
| |
| if (ret_val) |
| return ret_val; |
| |
| 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); |
| } |
| |
| 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; |
| } |