diff options
Diffstat (limited to 'net/netlabel/netlabel_domainhash.c')
| -rw-r--r-- | net/netlabel/netlabel_domainhash.c | 293 |
1 files changed, 244 insertions, 49 deletions
diff --git a/net/netlabel/netlabel_domainhash.c b/net/netlabel/netlabel_domainhash.c index ada67422234b..41d0e95d171e 100644 --- a/net/netlabel/netlabel_domainhash.c +++ b/net/netlabel/netlabel_domainhash.c @@ -37,10 +37,12 @@ #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" @@ -55,8 +57,9 @@ struct netlbl_domhsh_tbl { 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 *netlbl_domhsh; -static struct netlbl_dom_map *netlbl_domhsh_def; +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 @@ -126,18 +129,26 @@ static u32 netlbl_domhsh_hash(const char *key) 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. The caller is responsible for + * 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) +static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain, + u16 family) { u32 bkt; struct list_head *bkt_list; @@ -147,7 +158,9 @@ static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain) 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 && strcmp(iter->domain, domain) == 0) + if (iter->valid && + netlbl_family_match(iter->family, family) && + strcmp(iter->domain, domain) == 0) return iter; } @@ -157,28 +170,37 @@ static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain) /** * netlbl_domhsh_search_def - Search for a domain entry * @domain: the domain - * @def: return default if no match is found + * @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. The caller is responsible ensuring that the hash table 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) +static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain, + u16 family) { struct netlbl_dom_map *entry; - entry = netlbl_domhsh_search(domain); - if (entry == NULL) { - entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def); - if (entry != NULL && !entry->valid) - entry = NULL; + 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 entry; + return NULL; } /** @@ -203,6 +225,7 @@ static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry, { 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); @@ -221,12 +244,14 @@ static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry, 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: @@ -238,6 +263,12 @@ static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry, " 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); @@ -264,13 +295,25 @@ static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry) 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.addrsel != NULL) + if (entry->def.cipso != NULL || entry->def.calipso != NULL || + entry->def.addrsel != NULL) return -EINVAL; break; case NETLBL_NLTYPE_CIPSOV4: - if (entry->def.cipso == NULL) + 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: @@ -294,6 +337,12 @@ static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry) 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; @@ -358,15 +407,18 @@ int __init netlbl_domhsh_init(u32 size) * * Description: * Adds a new 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. + * 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; + struct netlbl_dom_map *entry_old, *entry_b; struct netlbl_af4list *iter4; struct netlbl_af4list *tmp4; #if IS_ENABLED(CONFIG_IPV6) @@ -385,9 +437,10 @@ int netlbl_domhsh_add(struct netlbl_dom_map *entry, rcu_read_lock(); spin_lock(&netlbl_domhsh_lock); if (entry->domain != NULL) - entry_old = netlbl_domhsh_search(entry->domain); + entry_old = netlbl_domhsh_search(entry->domain, entry->family); else - entry_old = netlbl_domhsh_search_def(entry->domain); + entry_old = netlbl_domhsh_search_def(entry->domain, + entry->family); if (entry_old == NULL) { entry->valid = 1; @@ -397,7 +450,41 @@ int netlbl_domhsh_add(struct netlbl_dom_map *entry, &rcu_dereference(netlbl_domhsh)->tbl[bkt]); } else { INIT_LIST_HEAD(&entry->list); - rcu_assign_pointer(netlbl_domhsh_def, entry); + 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) { @@ -513,10 +600,12 @@ int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry, spin_lock(&netlbl_domhsh_lock); if (entry->valid) { entry->valid = 0; - if (entry != rcu_dereference(netlbl_domhsh_def)) - list_del_rcu(&entry->list); + 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 - RCU_INIT_POINTER(netlbl_domhsh_def, NULL); + list_del_rcu(&entry->list); } else ret_val = -ENOENT; spin_unlock(&netlbl_domhsh_lock); @@ -533,6 +622,10 @@ int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry, 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: @@ -541,12 +634,22 @@ int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry, map4 = netlbl_domhsh_addr4_entry(iter4); cipso_v4_doi_putdef(map4->def.cipso); } - /* no need to check the IPv6 list since we currently - * support only unlabeled protocols for IPv6 */ +#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); } @@ -583,9 +686,9 @@ int netlbl_domhsh_remove_af4(const char *domain, rcu_read_lock(); if (domain) - entry_map = netlbl_domhsh_search(domain); + entry_map = netlbl_domhsh_search(domain, AF_INET); else - entry_map = netlbl_domhsh_search_def(domain); + entry_map = netlbl_domhsh_search_def(domain, AF_INET); if (entry_map == NULL || entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT) goto remove_af4_failure; @@ -622,28 +725,114 @@ remove_af4_failure: 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). Returns zero on success, - * negative on failure. + * 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, struct netlbl_audit *audit_info) +int netlbl_domhsh_remove(const char *domain, u16 family, + struct netlbl_audit *audit_info) { - int ret_val; + int ret_val = -EINVAL; struct netlbl_dom_map *entry; rcu_read_lock(); - if (domain) - entry = netlbl_domhsh_search(domain); - else - entry = netlbl_domhsh_search_def(domain); - ret_val = netlbl_domhsh_remove_entry(entry, audit_info); + + 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; @@ -651,32 +840,38 @@ int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info) /** * 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 for the domain hash table and handles any - * updates to the lower level protocol handler (i.e. CIPSO). Returns zero on - * success, non-zero on failure. + * 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(struct netlbl_audit *audit_info) +int netlbl_domhsh_remove_default(u16 family, struct netlbl_audit *audit_info) { - return netlbl_domhsh_remove(NULL, 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, - * return a pointer to a copy of the entry or NULL. The caller is responsible - * for ensuring that rcu_read_[un]lock() is called. + * 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) +struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain, u16 family) { - return netlbl_domhsh_search_def(domain); + if (family == AF_UNSPEC) + return NULL; + return netlbl_domhsh_search_def(domain, family); } /** @@ -696,7 +891,7 @@ struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain, struct netlbl_dom_map *dom_iter; struct netlbl_af4list *addr_iter; - dom_iter = netlbl_domhsh_search_def(domain); + dom_iter = netlbl_domhsh_search_def(domain, AF_INET); if (dom_iter == NULL) return NULL; @@ -726,7 +921,7 @@ struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain, struct netlbl_dom_map *dom_iter; struct netlbl_af6list *addr_iter; - dom_iter = netlbl_domhsh_search_def(domain); + dom_iter = netlbl_domhsh_search_def(domain, AF_INET6); if (dom_iter == NULL) return NULL; |