Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NetLabel Domain Hash Table |
| 3 | * |
| 4 | * This file manages the domain hash table that NetLabel uses to determine |
| 5 | * which network labeling protocol to use for a given domain. The NetLabel |
| 6 | * system manages static and dynamic label mappings for network protocols such |
| 7 | * as CIPSO and RIPSO. |
| 8 | * |
Paul Moore | 82c21bf | 2011-08-01 11:10:33 +0000 | [diff] [blame] | 9 | * Author: Paul Moore <paul@paul-moore.com> |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 10 | * |
| 11 | */ |
| 12 | |
| 13 | /* |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 14 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 15 | * |
| 16 | * This program is free software; you can redistribute it and/or modify |
| 17 | * it under the terms of the GNU General Public License as published by |
| 18 | * the Free Software Foundation; either version 2 of the License, or |
| 19 | * (at your option) any later version. |
| 20 | * |
| 21 | * This program is distributed in the hope that it will be useful, |
| 22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 24 | * the GNU General Public License for more details. |
| 25 | * |
| 26 | * You should have received a copy of the GNU General Public License |
Jeff Kirsher | d484ff1 | 2013-12-06 09:13:41 -0800 | [diff] [blame] | 27 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 28 | * |
| 29 | */ |
| 30 | |
| 31 | #include <linux/types.h> |
Franck Bui-Huu | 8252474 | 2008-05-12 21:21:05 +0200 | [diff] [blame] | 32 | #include <linux/rculist.h> |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 33 | #include <linux/skbuff.h> |
| 34 | #include <linux/spinlock.h> |
| 35 | #include <linux/string.h> |
Paul Moore | 32f50cd | 2006-09-28 14:51:47 -0700 | [diff] [blame] | 36 | #include <linux/audit.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 37 | #include <linux/slab.h> |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 38 | #include <net/netlabel.h> |
| 39 | #include <net/cipso_ipv4.h> |
| 40 | #include <asm/bug.h> |
| 41 | |
| 42 | #include "netlabel_mgmt.h" |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 43 | #include "netlabel_addrlist.h" |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 44 | #include "netlabel_domainhash.h" |
Paul Moore | 32f50cd | 2006-09-28 14:51:47 -0700 | [diff] [blame] | 45 | #include "netlabel_user.h" |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 46 | |
| 47 | struct netlbl_domhsh_tbl { |
| 48 | struct list_head *tbl; |
| 49 | u32 size; |
| 50 | }; |
| 51 | |
| 52 | /* Domain hash table */ |
Paul Moore | b914f3a | 2010-04-01 10:43:57 +0000 | [diff] [blame] | 53 | /* updates should be so rare that having one spinlock for the entire hash table |
| 54 | * should be okay */ |
Adrian Bunk | 8ce11e6 | 2006-08-07 21:50:48 -0700 | [diff] [blame] | 55 | static DEFINE_SPINLOCK(netlbl_domhsh_lock); |
Paul Moore | b914f3a | 2010-04-01 10:43:57 +0000 | [diff] [blame] | 56 | #define netlbl_domhsh_rcu_deref(p) \ |
Michal Hocko | d8bf4ca | 2011-07-08 14:39:41 +0200 | [diff] [blame] | 57 | rcu_dereference_check(p, lockdep_is_held(&netlbl_domhsh_lock)) |
Huw Davies | 96a8f7f | 2016-06-27 15:02:45 -0400 | [diff] [blame^] | 58 | static struct netlbl_domhsh_tbl __rcu *netlbl_domhsh; |
| 59 | static struct netlbl_dom_map __rcu *netlbl_domhsh_def; |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 60 | |
| 61 | /* |
| 62 | * Domain Hash Table Helper Functions |
| 63 | */ |
| 64 | |
| 65 | /** |
| 66 | * netlbl_domhsh_free_entry - Frees a domain hash table entry |
| 67 | * @entry: the entry's RCU field |
| 68 | * |
| 69 | * Description: |
| 70 | * This function is designed to be used as a callback to the call_rcu() |
| 71 | * function so that the memory allocated to a hash table entry can be released |
| 72 | * safely. |
| 73 | * |
| 74 | */ |
| 75 | static void netlbl_domhsh_free_entry(struct rcu_head *entry) |
| 76 | { |
| 77 | struct netlbl_dom_map *ptr; |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 78 | struct netlbl_af4list *iter4; |
| 79 | struct netlbl_af4list *tmp4; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 80 | #if IS_ENABLED(CONFIG_IPV6) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 81 | struct netlbl_af6list *iter6; |
| 82 | struct netlbl_af6list *tmp6; |
| 83 | #endif /* IPv6 */ |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 84 | |
| 85 | ptr = container_of(entry, struct netlbl_dom_map, rcu); |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 86 | if (ptr->def.type == NETLBL_NLTYPE_ADDRSELECT) { |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 87 | netlbl_af4list_foreach_safe(iter4, tmp4, |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 88 | &ptr->def.addrsel->list4) { |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 89 | netlbl_af4list_remove_entry(iter4); |
| 90 | kfree(netlbl_domhsh_addr4_entry(iter4)); |
| 91 | } |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 92 | #if IS_ENABLED(CONFIG_IPV6) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 93 | netlbl_af6list_foreach_safe(iter6, tmp6, |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 94 | &ptr->def.addrsel->list6) { |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 95 | netlbl_af6list_remove_entry(iter6); |
| 96 | kfree(netlbl_domhsh_addr6_entry(iter6)); |
| 97 | } |
| 98 | #endif /* IPv6 */ |
| 99 | } |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 100 | kfree(ptr->domain); |
| 101 | kfree(ptr); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * netlbl_domhsh_hash - Hashing function for the domain hash table |
| 106 | * @domain: the domain name to hash |
| 107 | * |
| 108 | * Description: |
| 109 | * This is the hashing function for the domain hash table, it returns the |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 110 | * correct bucket number for the domain. The caller is responsible for |
Paul Moore | b914f3a | 2010-04-01 10:43:57 +0000 | [diff] [blame] | 111 | * ensuring that the hash table is protected with either a RCU read lock or the |
| 112 | * hash table lock. |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 113 | * |
| 114 | */ |
| 115 | static u32 netlbl_domhsh_hash(const char *key) |
| 116 | { |
| 117 | u32 iter; |
| 118 | u32 val; |
| 119 | u32 len; |
| 120 | |
| 121 | /* This is taken (with slight modification) from |
| 122 | * security/selinux/ss/symtab.c:symhash() */ |
| 123 | |
| 124 | for (iter = 0, val = 0, len = strlen(key); iter < len; iter++) |
| 125 | val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter]; |
Paul Moore | b914f3a | 2010-04-01 10:43:57 +0000 | [diff] [blame] | 126 | return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1); |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | /** |
| 130 | * netlbl_domhsh_search - Search for a domain entry |
| 131 | * @domain: the domain |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 132 | * |
| 133 | * Description: |
| 134 | * Searches the domain hash table and returns a pointer to the hash table |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 135 | * entry if found, otherwise NULL is returned. The caller is responsible for |
Paul Moore | b914f3a | 2010-04-01 10:43:57 +0000 | [diff] [blame] | 136 | * ensuring that the hash table is protected with either a RCU read lock or the |
| 137 | * hash table lock. |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 138 | * |
| 139 | */ |
Paul Moore | b64397e | 2008-01-29 08:37:54 -0500 | [diff] [blame] | 140 | static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain) |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 141 | { |
| 142 | u32 bkt; |
Paul Moore | 5619670 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 143 | struct list_head *bkt_list; |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 144 | struct netlbl_dom_map *iter; |
| 145 | |
| 146 | if (domain != NULL) { |
| 147 | bkt = netlbl_domhsh_hash(domain); |
Paul Moore | b914f3a | 2010-04-01 10:43:57 +0000 | [diff] [blame] | 148 | bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt]; |
Paul Moore | 5619670 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 149 | list_for_each_entry_rcu(iter, bkt_list, list) |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 150 | if (iter->valid && strcmp(iter->domain, domain) == 0) |
| 151 | return iter; |
| 152 | } |
| 153 | |
Paul Moore | b64397e | 2008-01-29 08:37:54 -0500 | [diff] [blame] | 154 | return NULL; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * netlbl_domhsh_search_def - Search for a domain entry |
| 159 | * @domain: the domain |
| 160 | * @def: return default if no match is found |
| 161 | * |
| 162 | * Description: |
| 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 |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 166 | * returned. The caller is responsible ensuring that the hash table is |
Paul Moore | b914f3a | 2010-04-01 10:43:57 +0000 | [diff] [blame] | 167 | * protected with either a RCU read lock or the hash table lock. |
Paul Moore | b64397e | 2008-01-29 08:37:54 -0500 | [diff] [blame] | 168 | * |
| 169 | */ |
| 170 | static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain) |
| 171 | { |
| 172 | struct netlbl_dom_map *entry; |
| 173 | |
| 174 | entry = netlbl_domhsh_search(domain); |
| 175 | if (entry == NULL) { |
Paul Moore | b914f3a | 2010-04-01 10:43:57 +0000 | [diff] [blame] | 176 | entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def); |
Pavel Emelyanov | 4c3a0a2 | 2008-02-12 22:15:14 -0800 | [diff] [blame] | 177 | if (entry != NULL && !entry->valid) |
| 178 | entry = NULL; |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 179 | } |
| 180 | |
Pavel Emelyanov | 4c3a0a2 | 2008-02-12 22:15:14 -0800 | [diff] [blame] | 181 | return entry; |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 182 | } |
| 183 | |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 184 | /** |
| 185 | * netlbl_domhsh_audit_add - Generate an audit entry for an add event |
| 186 | * @entry: the entry being added |
| 187 | * @addr4: the IPv4 address information |
| 188 | * @addr6: the IPv6 address information |
| 189 | * @result: the result code |
| 190 | * @audit_info: NetLabel audit information |
| 191 | * |
| 192 | * Description: |
| 193 | * Generate an audit record for adding a new NetLabel/LSM mapping entry with |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 194 | * the given information. Caller is responsible for holding the necessary |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 195 | * locks. |
| 196 | * |
| 197 | */ |
| 198 | static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry, |
| 199 | struct netlbl_af4list *addr4, |
| 200 | struct netlbl_af6list *addr6, |
| 201 | int result, |
| 202 | struct netlbl_audit *audit_info) |
| 203 | { |
| 204 | struct audit_buffer *audit_buf; |
| 205 | struct cipso_v4_doi *cipsov4 = NULL; |
| 206 | u32 type; |
| 207 | |
| 208 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info); |
| 209 | if (audit_buf != NULL) { |
| 210 | audit_log_format(audit_buf, " nlbl_domain=%s", |
| 211 | entry->domain ? entry->domain : "(default)"); |
| 212 | if (addr4 != NULL) { |
| 213 | struct netlbl_domaddr4_map *map4; |
| 214 | map4 = netlbl_domhsh_addr4_entry(addr4); |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 215 | type = map4->def.type; |
| 216 | cipsov4 = map4->def.cipso; |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 217 | netlbl_af4list_audit_addr(audit_buf, 0, NULL, |
| 218 | addr4->addr, addr4->mask); |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 219 | #if IS_ENABLED(CONFIG_IPV6) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 220 | } else if (addr6 != NULL) { |
| 221 | struct netlbl_domaddr6_map *map6; |
| 222 | map6 = netlbl_domhsh_addr6_entry(addr6); |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 223 | type = map6->def.type; |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 224 | netlbl_af6list_audit_addr(audit_buf, 0, NULL, |
| 225 | &addr6->addr, &addr6->mask); |
| 226 | #endif /* IPv6 */ |
| 227 | } else { |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 228 | type = entry->def.type; |
| 229 | cipsov4 = entry->def.cipso; |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 230 | } |
| 231 | switch (type) { |
| 232 | case NETLBL_NLTYPE_UNLABELED: |
| 233 | audit_log_format(audit_buf, " nlbl_protocol=unlbl"); |
| 234 | break; |
| 235 | case NETLBL_NLTYPE_CIPSOV4: |
| 236 | BUG_ON(cipsov4 == NULL); |
| 237 | audit_log_format(audit_buf, |
| 238 | " nlbl_protocol=cipsov4 cipso_doi=%u", |
| 239 | cipsov4->doi); |
| 240 | break; |
| 241 | } |
| 242 | audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0); |
| 243 | audit_log_end(audit_buf); |
| 244 | } |
| 245 | } |
| 246 | |
Paul Moore | 6b21e1b | 2013-05-17 09:08:50 +0000 | [diff] [blame] | 247 | /** |
| 248 | * netlbl_domhsh_validate - Validate a new domain mapping entry |
| 249 | * @entry: the entry to validate |
| 250 | * |
| 251 | * This function validates the new domain mapping entry to ensure that it is |
| 252 | * a valid entry. Returns zero on success, negative values on failure. |
| 253 | * |
| 254 | */ |
| 255 | static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry) |
| 256 | { |
| 257 | struct netlbl_af4list *iter4; |
| 258 | struct netlbl_domaddr4_map *map4; |
| 259 | #if IS_ENABLED(CONFIG_IPV6) |
| 260 | struct netlbl_af6list *iter6; |
| 261 | struct netlbl_domaddr6_map *map6; |
| 262 | #endif /* IPv6 */ |
| 263 | |
| 264 | if (entry == NULL) |
| 265 | return -EINVAL; |
| 266 | |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 267 | switch (entry->def.type) { |
Paul Moore | 6b21e1b | 2013-05-17 09:08:50 +0000 | [diff] [blame] | 268 | case NETLBL_NLTYPE_UNLABELED: |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 269 | if (entry->def.cipso != NULL || entry->def.addrsel != NULL) |
Paul Moore | 6b21e1b | 2013-05-17 09:08:50 +0000 | [diff] [blame] | 270 | return -EINVAL; |
| 271 | break; |
| 272 | case NETLBL_NLTYPE_CIPSOV4: |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 273 | if (entry->def.cipso == NULL) |
Paul Moore | 6b21e1b | 2013-05-17 09:08:50 +0000 | [diff] [blame] | 274 | return -EINVAL; |
| 275 | break; |
| 276 | case NETLBL_NLTYPE_ADDRSELECT: |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 277 | netlbl_af4list_foreach(iter4, &entry->def.addrsel->list4) { |
Paul Moore | 6b21e1b | 2013-05-17 09:08:50 +0000 | [diff] [blame] | 278 | map4 = netlbl_domhsh_addr4_entry(iter4); |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 279 | switch (map4->def.type) { |
Paul Moore | 6b21e1b | 2013-05-17 09:08:50 +0000 | [diff] [blame] | 280 | case NETLBL_NLTYPE_UNLABELED: |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 281 | if (map4->def.cipso != NULL) |
Paul Moore | 6b21e1b | 2013-05-17 09:08:50 +0000 | [diff] [blame] | 282 | return -EINVAL; |
| 283 | break; |
| 284 | case NETLBL_NLTYPE_CIPSOV4: |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 285 | if (map4->def.cipso == NULL) |
Paul Moore | 6b21e1b | 2013-05-17 09:08:50 +0000 | [diff] [blame] | 286 | return -EINVAL; |
| 287 | break; |
| 288 | default: |
| 289 | return -EINVAL; |
| 290 | } |
| 291 | } |
| 292 | #if IS_ENABLED(CONFIG_IPV6) |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 293 | netlbl_af6list_foreach(iter6, &entry->def.addrsel->list6) { |
Paul Moore | 6b21e1b | 2013-05-17 09:08:50 +0000 | [diff] [blame] | 294 | map6 = netlbl_domhsh_addr6_entry(iter6); |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 295 | switch (map6->def.type) { |
Paul Moore | 6b21e1b | 2013-05-17 09:08:50 +0000 | [diff] [blame] | 296 | case NETLBL_NLTYPE_UNLABELED: |
| 297 | break; |
| 298 | default: |
| 299 | return -EINVAL; |
| 300 | } |
| 301 | } |
| 302 | #endif /* IPv6 */ |
| 303 | break; |
| 304 | default: |
| 305 | return -EINVAL; |
| 306 | } |
| 307 | |
| 308 | return 0; |
| 309 | } |
| 310 | |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 311 | /* |
| 312 | * Domain Hash Table Functions |
| 313 | */ |
| 314 | |
| 315 | /** |
| 316 | * netlbl_domhsh_init - Init for the domain hash |
| 317 | * @size: the number of bits to use for the hash buckets |
| 318 | * |
| 319 | * Description: |
| 320 | * Initializes the domain hash table, should be called only by |
| 321 | * netlbl_user_init() during initialization. Returns zero on success, non-zero |
| 322 | * values on error. |
| 323 | * |
| 324 | */ |
Pavel Emelyanov | 05705e4 | 2008-02-17 22:33:57 -0800 | [diff] [blame] | 325 | int __init netlbl_domhsh_init(u32 size) |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 326 | { |
| 327 | u32 iter; |
| 328 | struct netlbl_domhsh_tbl *hsh_tbl; |
| 329 | |
| 330 | if (size == 0) |
| 331 | return -EINVAL; |
| 332 | |
| 333 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); |
| 334 | if (hsh_tbl == NULL) |
| 335 | return -ENOMEM; |
| 336 | hsh_tbl->size = 1 << size; |
| 337 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, |
| 338 | sizeof(struct list_head), |
| 339 | GFP_KERNEL); |
| 340 | if (hsh_tbl->tbl == NULL) { |
| 341 | kfree(hsh_tbl); |
| 342 | return -ENOMEM; |
| 343 | } |
| 344 | for (iter = 0; iter < hsh_tbl->size; iter++) |
| 345 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); |
| 346 | |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 347 | spin_lock(&netlbl_domhsh_lock); |
Eric Dumazet | cf778b0 | 2012-01-12 04:41:32 +0000 | [diff] [blame] | 348 | rcu_assign_pointer(netlbl_domhsh, hsh_tbl); |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 349 | spin_unlock(&netlbl_domhsh_lock); |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 350 | |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | /** |
| 355 | * netlbl_domhsh_add - Adds a entry to the domain hash table |
| 356 | * @entry: the entry to add |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 357 | * @audit_info: NetLabel audit information |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 358 | * |
| 359 | * Description: |
| 360 | * Adds a new entry to the domain hash table and handles any updates to the |
| 361 | * lower level protocol handler (i.e. CIPSO). Returns zero on success, |
| 362 | * negative on failure. |
| 363 | * |
| 364 | */ |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 365 | int netlbl_domhsh_add(struct netlbl_dom_map *entry, |
| 366 | struct netlbl_audit *audit_info) |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 367 | { |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 368 | int ret_val = 0; |
| 369 | struct netlbl_dom_map *entry_old; |
| 370 | struct netlbl_af4list *iter4; |
| 371 | struct netlbl_af4list *tmp4; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 372 | #if IS_ENABLED(CONFIG_IPV6) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 373 | struct netlbl_af6list *iter6; |
| 374 | struct netlbl_af6list *tmp6; |
| 375 | #endif /* IPv6 */ |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 376 | |
Paul Moore | 6b21e1b | 2013-05-17 09:08:50 +0000 | [diff] [blame] | 377 | ret_val = netlbl_domhsh_validate(entry); |
| 378 | if (ret_val != 0) |
| 379 | return ret_val; |
| 380 | |
Paul Moore | b914f3a | 2010-04-01 10:43:57 +0000 | [diff] [blame] | 381 | /* XXX - we can remove this RCU read lock as the spinlock protects the |
| 382 | * entire function, but before we do we need to fixup the |
| 383 | * netlbl_af[4,6]list RCU functions to do "the right thing" with |
| 384 | * respect to rcu_dereference() when only a spinlock is held. */ |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 385 | rcu_read_lock(); |
Paul Moore | 1c3fad9 | 2008-01-29 08:37:57 -0500 | [diff] [blame] | 386 | spin_lock(&netlbl_domhsh_lock); |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 387 | if (entry->domain != NULL) |
| 388 | entry_old = netlbl_domhsh_search(entry->domain); |
| 389 | else |
| 390 | entry_old = netlbl_domhsh_search_def(entry->domain); |
| 391 | if (entry_old == NULL) { |
| 392 | entry->valid = 1; |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 393 | |
| 394 | if (entry->domain != NULL) { |
| 395 | u32 bkt = netlbl_domhsh_hash(entry->domain); |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 396 | list_add_tail_rcu(&entry->list, |
Paul Moore | 3482fd9 | 2007-08-07 17:53:10 -0700 | [diff] [blame] | 397 | &rcu_dereference(netlbl_domhsh)->tbl[bkt]); |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 398 | } else { |
| 399 | INIT_LIST_HEAD(&entry->list); |
Eric Dumazet | cf778b0 | 2012-01-12 04:41:32 +0000 | [diff] [blame] | 400 | rcu_assign_pointer(netlbl_domhsh_def, entry); |
Paul Moore | de64688 | 2006-11-17 17:38:55 -0500 | [diff] [blame] | 401 | } |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 402 | |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 403 | if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 404 | netlbl_af4list_foreach_rcu(iter4, |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 405 | &entry->def.addrsel->list4) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 406 | netlbl_domhsh_audit_add(entry, iter4, NULL, |
| 407 | ret_val, audit_info); |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 408 | #if IS_ENABLED(CONFIG_IPV6) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 409 | netlbl_af6list_foreach_rcu(iter6, |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 410 | &entry->def.addrsel->list6) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 411 | netlbl_domhsh_audit_add(entry, NULL, iter6, |
| 412 | ret_val, audit_info); |
| 413 | #endif /* IPv6 */ |
| 414 | } else |
| 415 | netlbl_domhsh_audit_add(entry, NULL, NULL, |
| 416 | ret_val, audit_info); |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 417 | } else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT && |
| 418 | entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 419 | struct list_head *old_list4; |
| 420 | struct list_head *old_list6; |
| 421 | |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 422 | old_list4 = &entry_old->def.addrsel->list4; |
| 423 | old_list6 = &entry_old->def.addrsel->list6; |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 424 | |
| 425 | /* we only allow the addition of address selectors if all of |
| 426 | * the selectors do not exist in the existing domain map */ |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 427 | netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 428 | if (netlbl_af4list_search_exact(iter4->addr, |
| 429 | iter4->mask, |
| 430 | old_list4)) { |
| 431 | ret_val = -EEXIST; |
| 432 | goto add_return; |
| 433 | } |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 434 | #if IS_ENABLED(CONFIG_IPV6) |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 435 | netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 436 | if (netlbl_af6list_search_exact(&iter6->addr, |
| 437 | &iter6->mask, |
| 438 | old_list6)) { |
| 439 | ret_val = -EEXIST; |
| 440 | goto add_return; |
| 441 | } |
| 442 | #endif /* IPv6 */ |
| 443 | |
| 444 | netlbl_af4list_foreach_safe(iter4, tmp4, |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 445 | &entry->def.addrsel->list4) { |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 446 | netlbl_af4list_remove_entry(iter4); |
| 447 | iter4->valid = 1; |
| 448 | ret_val = netlbl_af4list_add(iter4, old_list4); |
| 449 | netlbl_domhsh_audit_add(entry_old, iter4, NULL, |
| 450 | ret_val, audit_info); |
| 451 | if (ret_val != 0) |
| 452 | goto add_return; |
| 453 | } |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 454 | #if IS_ENABLED(CONFIG_IPV6) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 455 | netlbl_af6list_foreach_safe(iter6, tmp6, |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 456 | &entry->def.addrsel->list6) { |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 457 | netlbl_af6list_remove_entry(iter6); |
| 458 | iter6->valid = 1; |
| 459 | ret_val = netlbl_af6list_add(iter6, old_list6); |
| 460 | netlbl_domhsh_audit_add(entry_old, NULL, iter6, |
| 461 | ret_val, audit_info); |
| 462 | if (ret_val != 0) |
| 463 | goto add_return; |
| 464 | } |
| 465 | #endif /* IPv6 */ |
| 466 | } else |
| 467 | ret_val = -EINVAL; |
| 468 | |
| 469 | add_return: |
| 470 | spin_unlock(&netlbl_domhsh_lock); |
| 471 | rcu_read_unlock(); |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 472 | return ret_val; |
| 473 | } |
| 474 | |
| 475 | /** |
| 476 | * netlbl_domhsh_add_default - Adds the default entry to the domain hash table |
| 477 | * @entry: the entry to add |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 478 | * @audit_info: NetLabel audit information |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 479 | * |
| 480 | * Description: |
| 481 | * Adds a new default entry to the domain hash table and handles any updates |
| 482 | * to the lower level protocol handler (i.e. CIPSO). Returns zero on success, |
| 483 | * negative on failure. |
| 484 | * |
| 485 | */ |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 486 | int netlbl_domhsh_add_default(struct netlbl_dom_map *entry, |
| 487 | struct netlbl_audit *audit_info) |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 488 | { |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 489 | return netlbl_domhsh_add(entry, audit_info); |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | /** |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 493 | * netlbl_domhsh_remove_entry - Removes a given entry from the domain table |
| 494 | * @entry: the entry to remove |
| 495 | * @audit_info: NetLabel audit information |
| 496 | * |
| 497 | * Description: |
| 498 | * Removes an entry from the domain hash table and handles any updates to the |
| 499 | * lower level protocol handler (i.e. CIPSO). Caller is responsible for |
| 500 | * ensuring that the RCU read lock is held. Returns zero on success, negative |
| 501 | * on failure. |
| 502 | * |
| 503 | */ |
| 504 | int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry, |
| 505 | struct netlbl_audit *audit_info) |
| 506 | { |
| 507 | int ret_val = 0; |
| 508 | struct audit_buffer *audit_buf; |
| 509 | |
| 510 | if (entry == NULL) |
| 511 | return -ENOENT; |
| 512 | |
| 513 | spin_lock(&netlbl_domhsh_lock); |
| 514 | if (entry->valid) { |
| 515 | entry->valid = 0; |
| 516 | if (entry != rcu_dereference(netlbl_domhsh_def)) |
| 517 | list_del_rcu(&entry->list); |
| 518 | else |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 519 | RCU_INIT_POINTER(netlbl_domhsh_def, NULL); |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 520 | } else |
| 521 | ret_val = -ENOENT; |
| 522 | spin_unlock(&netlbl_domhsh_lock); |
| 523 | |
| 524 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info); |
| 525 | if (audit_buf != NULL) { |
| 526 | audit_log_format(audit_buf, |
| 527 | " nlbl_domain=%s res=%u", |
| 528 | entry->domain ? entry->domain : "(default)", |
| 529 | ret_val == 0 ? 1 : 0); |
| 530 | audit_log_end(audit_buf); |
| 531 | } |
| 532 | |
| 533 | if (ret_val == 0) { |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 534 | struct netlbl_af4list *iter4; |
| 535 | struct netlbl_domaddr4_map *map4; |
| 536 | |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 537 | switch (entry->def.type) { |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 538 | case NETLBL_NLTYPE_ADDRSELECT: |
| 539 | netlbl_af4list_foreach_rcu(iter4, |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 540 | &entry->def.addrsel->list4) { |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 541 | map4 = netlbl_domhsh_addr4_entry(iter4); |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 542 | cipso_v4_doi_putdef(map4->def.cipso); |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 543 | } |
| 544 | /* no need to check the IPv6 list since we currently |
| 545 | * support only unlabeled protocols for IPv6 */ |
| 546 | break; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 547 | case NETLBL_NLTYPE_CIPSOV4: |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 548 | cipso_v4_doi_putdef(entry->def.cipso); |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 549 | break; |
| 550 | } |
| 551 | call_rcu(&entry->rcu, netlbl_domhsh_free_entry); |
| 552 | } |
| 553 | |
| 554 | return ret_val; |
| 555 | } |
| 556 | |
| 557 | /** |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 558 | * netlbl_domhsh_remove_af4 - Removes an address selector entry |
| 559 | * @domain: the domain |
| 560 | * @addr: IPv4 address |
| 561 | * @mask: IPv4 address mask |
| 562 | * @audit_info: NetLabel audit information |
| 563 | * |
| 564 | * Description: |
| 565 | * Removes an individual address selector from a domain mapping and potentially |
| 566 | * the entire mapping if it is empty. Returns zero on success, negative values |
| 567 | * on failure. |
| 568 | * |
| 569 | */ |
| 570 | int netlbl_domhsh_remove_af4(const char *domain, |
| 571 | const struct in_addr *addr, |
| 572 | const struct in_addr *mask, |
| 573 | struct netlbl_audit *audit_info) |
| 574 | { |
| 575 | struct netlbl_dom_map *entry_map; |
| 576 | struct netlbl_af4list *entry_addr; |
| 577 | struct netlbl_af4list *iter4; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 578 | #if IS_ENABLED(CONFIG_IPV6) |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 579 | struct netlbl_af6list *iter6; |
| 580 | #endif /* IPv6 */ |
| 581 | struct netlbl_domaddr4_map *entry; |
| 582 | |
| 583 | rcu_read_lock(); |
| 584 | |
| 585 | if (domain) |
| 586 | entry_map = netlbl_domhsh_search(domain); |
| 587 | else |
| 588 | entry_map = netlbl_domhsh_search_def(domain); |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 589 | if (entry_map == NULL || |
| 590 | entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT) |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 591 | goto remove_af4_failure; |
| 592 | |
| 593 | spin_lock(&netlbl_domhsh_lock); |
| 594 | entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr, |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 595 | &entry_map->def.addrsel->list4); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 596 | spin_unlock(&netlbl_domhsh_lock); |
| 597 | |
| 598 | if (entry_addr == NULL) |
| 599 | goto remove_af4_failure; |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 600 | netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4) |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 601 | goto remove_af4_single_addr; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 602 | #if IS_ENABLED(CONFIG_IPV6) |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 603 | netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6) |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 604 | goto remove_af4_single_addr; |
| 605 | #endif /* IPv6 */ |
| 606 | /* the domain mapping is empty so remove it from the mapping table */ |
| 607 | netlbl_domhsh_remove_entry(entry_map, audit_info); |
| 608 | |
| 609 | remove_af4_single_addr: |
| 610 | rcu_read_unlock(); |
| 611 | /* yick, we can't use call_rcu here because we don't have a rcu head |
| 612 | * pointer but hopefully this should be a rare case so the pause |
| 613 | * shouldn't be a problem */ |
| 614 | synchronize_rcu(); |
| 615 | entry = netlbl_domhsh_addr4_entry(entry_addr); |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 616 | cipso_v4_doi_putdef(entry->def.cipso); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 617 | kfree(entry); |
| 618 | return 0; |
| 619 | |
| 620 | remove_af4_failure: |
| 621 | rcu_read_unlock(); |
| 622 | return -ENOENT; |
| 623 | } |
| 624 | |
| 625 | /** |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 626 | * netlbl_domhsh_remove - Removes an entry from the domain hash table |
| 627 | * @domain: the domain to remove |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 628 | * @audit_info: NetLabel audit information |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 629 | * |
| 630 | * Description: |
| 631 | * Removes an entry from the domain hash table and handles any updates to the |
| 632 | * lower level protocol handler (i.e. CIPSO). Returns zero on success, |
| 633 | * negative on failure. |
| 634 | * |
| 635 | */ |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 636 | int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info) |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 637 | { |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 638 | int ret_val; |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 639 | struct netlbl_dom_map *entry; |
| 640 | |
| 641 | rcu_read_lock(); |
Paul Moore | b64397e | 2008-01-29 08:37:54 -0500 | [diff] [blame] | 642 | if (domain) |
| 643 | entry = netlbl_domhsh_search(domain); |
| 644 | else |
| 645 | entry = netlbl_domhsh_search_def(domain); |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 646 | ret_val = netlbl_domhsh_remove_entry(entry, audit_info); |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 647 | rcu_read_unlock(); |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 648 | |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 649 | return ret_val; |
| 650 | } |
| 651 | |
| 652 | /** |
| 653 | * netlbl_domhsh_remove_default - Removes the default entry from the table |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 654 | * @audit_info: NetLabel audit information |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 655 | * |
| 656 | * Description: |
| 657 | * Removes/resets the default entry for the domain hash table and handles any |
| 658 | * updates to the lower level protocol handler (i.e. CIPSO). Returns zero on |
| 659 | * success, non-zero on failure. |
| 660 | * |
| 661 | */ |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 662 | int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info) |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 663 | { |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 664 | return netlbl_domhsh_remove(NULL, audit_info); |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | /** |
| 668 | * netlbl_domhsh_getentry - Get an entry from the domain hash table |
| 669 | * @domain: the domain name to search for |
| 670 | * |
| 671 | * Description: |
| 672 | * Look through the domain hash table searching for an entry to match @domain, |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 673 | * return a pointer to a copy of the entry or NULL. The caller is responsible |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 674 | * for ensuring that rcu_read_[un]lock() is called. |
| 675 | * |
| 676 | */ |
| 677 | struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain) |
| 678 | { |
Paul Moore | b64397e | 2008-01-29 08:37:54 -0500 | [diff] [blame] | 679 | return netlbl_domhsh_search_def(domain); |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | /** |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 683 | * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table |
| 684 | * @domain: the domain name to search for |
| 685 | * @addr: the IP address to search for |
| 686 | * |
| 687 | * Description: |
| 688 | * Look through the domain hash table searching for an entry to match @domain |
| 689 | * and @addr, return a pointer to a copy of the entry or NULL. The caller is |
| 690 | * responsible for ensuring that rcu_read_[un]lock() is called. |
| 691 | * |
| 692 | */ |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 693 | struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain, |
| 694 | __be32 addr) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 695 | { |
| 696 | struct netlbl_dom_map *dom_iter; |
| 697 | struct netlbl_af4list *addr_iter; |
| 698 | |
| 699 | dom_iter = netlbl_domhsh_search_def(domain); |
| 700 | if (dom_iter == NULL) |
| 701 | return NULL; |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 702 | |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 703 | if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT) |
| 704 | return &dom_iter->def; |
| 705 | addr_iter = netlbl_af4list_search(addr, &dom_iter->def.addrsel->list4); |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 706 | if (addr_iter == NULL) |
| 707 | return NULL; |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 708 | return &(netlbl_domhsh_addr4_entry(addr_iter)->def); |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 709 | } |
| 710 | |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 711 | #if IS_ENABLED(CONFIG_IPV6) |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 712 | /** |
| 713 | * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table |
| 714 | * @domain: the domain name to search for |
| 715 | * @addr: the IP address to search for |
| 716 | * |
| 717 | * Description: |
| 718 | * Look through the domain hash table searching for an entry to match @domain |
| 719 | * and @addr, return a pointer to a copy of the entry or NULL. The caller is |
| 720 | * responsible for ensuring that rcu_read_[un]lock() is called. |
| 721 | * |
| 722 | */ |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 723 | struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain, |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 724 | const struct in6_addr *addr) |
| 725 | { |
| 726 | struct netlbl_dom_map *dom_iter; |
| 727 | struct netlbl_af6list *addr_iter; |
| 728 | |
| 729 | dom_iter = netlbl_domhsh_search_def(domain); |
| 730 | if (dom_iter == NULL) |
| 731 | return NULL; |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 732 | |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 733 | if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT) |
| 734 | return &dom_iter->def; |
| 735 | addr_iter = netlbl_af6list_search(addr, &dom_iter->def.addrsel->list6); |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 736 | if (addr_iter == NULL) |
| 737 | return NULL; |
Paul Moore | 6a8b7f0 | 2013-08-02 14:45:08 -0400 | [diff] [blame] | 738 | return &(netlbl_domhsh_addr6_entry(addr_iter)->def); |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 739 | } |
| 740 | #endif /* IPv6 */ |
| 741 | |
| 742 | /** |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 743 | * netlbl_domhsh_walk - Iterate through the domain mapping hash table |
| 744 | * @skip_bkt: the number of buckets to skip at the start |
| 745 | * @skip_chain: the number of entries to skip in the first iterated bucket |
| 746 | * @callback: callback for each entry |
| 747 | * @cb_arg: argument for the callback function |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 748 | * |
| 749 | * Description: |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 750 | * Interate over the domain mapping hash table, skipping the first @skip_bkt |
| 751 | * buckets and @skip_chain entries. For each entry in the table call |
| 752 | * @callback, if @callback returns a negative value stop 'walking' through the |
| 753 | * table and return. Updates the values in @skip_bkt and @skip_chain on |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 754 | * return. Returns zero on success, negative values on failure. |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 755 | * |
| 756 | */ |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 757 | int netlbl_domhsh_walk(u32 *skip_bkt, |
| 758 | u32 *skip_chain, |
| 759 | int (*callback) (struct netlbl_dom_map *entry, void *arg), |
| 760 | void *cb_arg) |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 761 | { |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 762 | int ret_val = -ENOENT; |
| 763 | u32 iter_bkt; |
Paul Moore | 5619670 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 764 | struct list_head *iter_list; |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 765 | struct netlbl_dom_map *iter_entry; |
| 766 | u32 chain_cnt = 0; |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 767 | |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 768 | rcu_read_lock(); |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 769 | for (iter_bkt = *skip_bkt; |
| 770 | iter_bkt < rcu_dereference(netlbl_domhsh)->size; |
| 771 | iter_bkt++, chain_cnt = 0) { |
Paul Moore | 5619670 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 772 | iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt]; |
| 773 | list_for_each_entry_rcu(iter_entry, iter_list, list) |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 774 | if (iter_entry->valid) { |
| 775 | if (chain_cnt++ < *skip_chain) |
| 776 | continue; |
| 777 | ret_val = callback(iter_entry, cb_arg); |
| 778 | if (ret_val < 0) { |
| 779 | chain_cnt--; |
| 780 | goto walk_return; |
| 781 | } |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 782 | } |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 783 | } |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 784 | |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 785 | walk_return: |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 786 | rcu_read_unlock(); |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 787 | *skip_bkt = iter_bkt; |
| 788 | *skip_chain = chain_cnt; |
| 789 | return ret_val; |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 790 | } |