Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NetLabel Kernel API |
| 3 | * |
| 4 | * This file defines the kernel API for the NetLabel system. The NetLabel |
| 5 | * system manages static and dynamic label mappings for network protocols such |
| 6 | * as CIPSO and RIPSO. |
| 7 | * |
Paul Moore | 82c21bf | 2011-08-01 11:10:33 +0000 | [diff] [blame] | 8 | * Author: Paul Moore <paul@paul-moore.com> |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 9 | * |
| 10 | */ |
| 11 | |
| 12 | /* |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 13 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify |
| 16 | * it under the terms of the GNU General Public License as published by |
| 17 | * the Free Software Foundation; either version 2 of the License, or |
| 18 | * (at your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 23 | * the GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
| 26 | * along with this program; if not, write to the Free Software |
| 27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 28 | * |
| 29 | */ |
| 30 | |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/types.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 33 | #include <linux/slab.h> |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 34 | #include <linux/audit.h> |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 35 | #include <linux/in.h> |
| 36 | #include <linux/in6.h> |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 37 | #include <net/ip.h> |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 38 | #include <net/ipv6.h> |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 39 | #include <net/netlabel.h> |
| 40 | #include <net/cipso_ipv4.h> |
| 41 | #include <asm/bug.h> |
Arun Sharma | 6006349 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 42 | #include <linux/atomic.h> |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 43 | |
| 44 | #include "netlabel_domainhash.h" |
| 45 | #include "netlabel_unlabeled.h" |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 46 | #include "netlabel_cipso_v4.h" |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 47 | #include "netlabel_user.h" |
Paul Moore | 23bcdc1 | 2007-07-18 12:28:45 -0400 | [diff] [blame] | 48 | #include "netlabel_mgmt.h" |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 49 | #include "netlabel_addrlist.h" |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 50 | |
| 51 | /* |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 52 | * Configuration Functions |
| 53 | */ |
| 54 | |
| 55 | /** |
| 56 | * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping |
| 57 | * @domain: the domain mapping to remove |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 58 | * @family: address family |
| 59 | * @addr: IP address |
| 60 | * @mask: IP address mask |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 61 | * @audit_info: NetLabel audit information |
| 62 | * |
| 63 | * Description: |
| 64 | * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the |
| 65 | * default domain mapping to be removed. Returns zero on success, negative |
| 66 | * values on failure. |
| 67 | * |
| 68 | */ |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 69 | int netlbl_cfg_map_del(const char *domain, |
| 70 | u16 family, |
| 71 | const void *addr, |
| 72 | const void *mask, |
| 73 | struct netlbl_audit *audit_info) |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 74 | { |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 75 | if (addr == NULL && mask == NULL) { |
| 76 | return netlbl_domhsh_remove(domain, audit_info); |
| 77 | } else if (addr != NULL && mask != NULL) { |
| 78 | switch (family) { |
| 79 | case AF_INET: |
| 80 | return netlbl_domhsh_remove_af4(domain, addr, mask, |
| 81 | audit_info); |
| 82 | default: |
| 83 | return -EPFNOSUPPORT; |
| 84 | } |
| 85 | } else |
| 86 | return -EINVAL; |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | /** |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 90 | * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 91 | * @domain: the domain mapping to add |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 92 | * @family: address family |
| 93 | * @addr: IP address |
| 94 | * @mask: IP address mask |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 95 | * @audit_info: NetLabel audit information |
| 96 | * |
| 97 | * Description: |
| 98 | * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL |
| 99 | * causes a new default domain mapping to be added. Returns zero on success, |
| 100 | * negative values on failure. |
| 101 | * |
| 102 | */ |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 103 | int netlbl_cfg_unlbl_map_add(const char *domain, |
| 104 | u16 family, |
| 105 | const void *addr, |
| 106 | const void *mask, |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 107 | struct netlbl_audit *audit_info) |
| 108 | { |
| 109 | int ret_val = -ENOMEM; |
| 110 | struct netlbl_dom_map *entry; |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 111 | struct netlbl_domaddr_map *addrmap = NULL; |
| 112 | struct netlbl_domaddr4_map *map4 = NULL; |
| 113 | struct netlbl_domaddr6_map *map6 = NULL; |
| 114 | const struct in_addr *addr4, *mask4; |
| 115 | const struct in6_addr *addr6, *mask6; |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 116 | |
| 117 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
| 118 | if (entry == NULL) |
Paul Moore | 948a724 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 119 | return -ENOMEM; |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 120 | if (domain != NULL) { |
| 121 | entry->domain = kstrdup(domain, GFP_ATOMIC); |
| 122 | if (entry->domain == NULL) |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 123 | goto cfg_unlbl_map_add_failure; |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 124 | } |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 125 | |
| 126 | if (addr == NULL && mask == NULL) |
| 127 | entry->type = NETLBL_NLTYPE_UNLABELED; |
| 128 | else if (addr != NULL && mask != NULL) { |
| 129 | addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); |
| 130 | if (addrmap == NULL) |
| 131 | goto cfg_unlbl_map_add_failure; |
| 132 | INIT_LIST_HEAD(&addrmap->list4); |
| 133 | INIT_LIST_HEAD(&addrmap->list6); |
| 134 | |
| 135 | switch (family) { |
| 136 | case AF_INET: |
| 137 | addr4 = addr; |
| 138 | mask4 = mask; |
| 139 | map4 = kzalloc(sizeof(*map4), GFP_ATOMIC); |
| 140 | if (map4 == NULL) |
| 141 | goto cfg_unlbl_map_add_failure; |
| 142 | map4->type = NETLBL_NLTYPE_UNLABELED; |
| 143 | map4->list.addr = addr4->s_addr & mask4->s_addr; |
| 144 | map4->list.mask = mask4->s_addr; |
| 145 | map4->list.valid = 1; |
| 146 | ret_val = netlbl_af4list_add(&map4->list, |
| 147 | &addrmap->list4); |
| 148 | if (ret_val != 0) |
| 149 | goto cfg_unlbl_map_add_failure; |
| 150 | break; |
| 151 | case AF_INET6: |
| 152 | addr6 = addr; |
| 153 | mask6 = mask; |
| 154 | map6 = kzalloc(sizeof(*map6), GFP_ATOMIC); |
Julia Lawall | ca7daea | 2009-07-30 04:38:19 +0000 | [diff] [blame] | 155 | if (map6 == NULL) |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 156 | goto cfg_unlbl_map_add_failure; |
| 157 | map6->type = NETLBL_NLTYPE_UNLABELED; |
| 158 | ipv6_addr_copy(&map6->list.addr, addr6); |
| 159 | map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0]; |
| 160 | map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1]; |
| 161 | map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2]; |
| 162 | map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3]; |
| 163 | ipv6_addr_copy(&map6->list.mask, mask6); |
| 164 | map6->list.valid = 1; |
| 165 | ret_val = netlbl_af4list_add(&map4->list, |
| 166 | &addrmap->list4); |
| 167 | if (ret_val != 0) |
| 168 | goto cfg_unlbl_map_add_failure; |
| 169 | break; |
| 170 | default: |
| 171 | goto cfg_unlbl_map_add_failure; |
| 172 | break; |
| 173 | } |
| 174 | |
| 175 | entry->type_def.addrsel = addrmap; |
| 176 | entry->type = NETLBL_NLTYPE_ADDRSELECT; |
| 177 | } else { |
| 178 | ret_val = -EINVAL; |
| 179 | goto cfg_unlbl_map_add_failure; |
| 180 | } |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 181 | |
| 182 | ret_val = netlbl_domhsh_add(entry, audit_info); |
| 183 | if (ret_val != 0) |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 184 | goto cfg_unlbl_map_add_failure; |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 185 | |
| 186 | return 0; |
| 187 | |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 188 | cfg_unlbl_map_add_failure: |
Julia Lawall | 4794323 | 2009-07-27 06:15:43 +0000 | [diff] [blame] | 189 | kfree(entry->domain); |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 190 | kfree(entry); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 191 | kfree(addrmap); |
| 192 | kfree(map4); |
| 193 | kfree(map6); |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 194 | return ret_val; |
| 195 | } |
| 196 | |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 197 | |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 198 | /** |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 199 | * netlbl_cfg_unlbl_static_add - Adds a new static label |
| 200 | * @net: network namespace |
| 201 | * @dev_name: interface name |
| 202 | * @addr: IP address in network byte order (struct in[6]_addr) |
| 203 | * @mask: address mask in network byte order (struct in[6]_addr) |
| 204 | * @family: address family |
| 205 | * @secid: LSM secid value for the entry |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 206 | * @audit_info: NetLabel audit information |
| 207 | * |
| 208 | * Description: |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 209 | * Adds a new NetLabel static label to be used when protocol provided labels |
| 210 | * are not present on incoming traffic. If @dev_name is NULL then the default |
| 211 | * interface will be used. Returns zero on success, negative values on failure. |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 212 | * |
| 213 | */ |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 214 | int netlbl_cfg_unlbl_static_add(struct net *net, |
| 215 | const char *dev_name, |
| 216 | const void *addr, |
| 217 | const void *mask, |
| 218 | u16 family, |
| 219 | u32 secid, |
| 220 | struct netlbl_audit *audit_info) |
| 221 | { |
| 222 | u32 addr_len; |
| 223 | |
| 224 | switch (family) { |
| 225 | case AF_INET: |
| 226 | addr_len = sizeof(struct in_addr); |
| 227 | break; |
| 228 | case AF_INET6: |
| 229 | addr_len = sizeof(struct in6_addr); |
| 230 | break; |
| 231 | default: |
| 232 | return -EPFNOSUPPORT; |
| 233 | } |
| 234 | |
| 235 | return netlbl_unlhsh_add(net, |
| 236 | dev_name, addr, mask, addr_len, |
| 237 | secid, audit_info); |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * netlbl_cfg_unlbl_static_del - Removes an existing static label |
| 242 | * @net: network namespace |
| 243 | * @dev_name: interface name |
| 244 | * @addr: IP address in network byte order (struct in[6]_addr) |
| 245 | * @mask: address mask in network byte order (struct in[6]_addr) |
| 246 | * @family: address family |
| 247 | * @secid: LSM secid value for the entry |
| 248 | * @audit_info: NetLabel audit information |
| 249 | * |
| 250 | * Description: |
| 251 | * Removes an existing NetLabel static label used when protocol provided labels |
| 252 | * are not present on incoming traffic. If @dev_name is NULL then the default |
| 253 | * interface will be used. Returns zero on success, negative values on failure. |
| 254 | * |
| 255 | */ |
| 256 | int netlbl_cfg_unlbl_static_del(struct net *net, |
| 257 | const char *dev_name, |
| 258 | const void *addr, |
| 259 | const void *mask, |
| 260 | u16 family, |
| 261 | struct netlbl_audit *audit_info) |
| 262 | { |
| 263 | u32 addr_len; |
| 264 | |
| 265 | switch (family) { |
| 266 | case AF_INET: |
| 267 | addr_len = sizeof(struct in_addr); |
| 268 | break; |
| 269 | case AF_INET6: |
| 270 | addr_len = sizeof(struct in6_addr); |
| 271 | break; |
| 272 | default: |
| 273 | return -EPFNOSUPPORT; |
| 274 | } |
| 275 | |
| 276 | return netlbl_unlhsh_remove(net, |
| 277 | dev_name, addr, mask, addr_len, |
| 278 | audit_info); |
| 279 | } |
| 280 | |
| 281 | /** |
| 282 | * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition |
| 283 | * @doi_def: CIPSO DOI definition |
| 284 | * @audit_info: NetLabel audit information |
| 285 | * |
| 286 | * Description: |
| 287 | * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on |
| 288 | * success and negative values on failure. |
| 289 | * |
| 290 | */ |
| 291 | int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, |
| 292 | struct netlbl_audit *audit_info) |
| 293 | { |
| 294 | return cipso_v4_doi_add(doi_def, audit_info); |
| 295 | } |
| 296 | |
| 297 | /** |
| 298 | * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition |
| 299 | * @doi: CIPSO DOI |
| 300 | * @audit_info: NetLabel audit information |
| 301 | * |
| 302 | * Description: |
| 303 | * Remove an existing CIPSO DOI definition matching @doi. Returns zero on |
| 304 | * success and negative values on failure. |
| 305 | * |
| 306 | */ |
| 307 | void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info) |
| 308 | { |
| 309 | cipso_v4_doi_remove(doi, audit_info); |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping |
| 314 | * @doi: the CIPSO DOI |
| 315 | * @domain: the domain mapping to add |
| 316 | * @addr: IP address |
| 317 | * @mask: IP address mask |
| 318 | * @audit_info: NetLabel audit information |
| 319 | * |
| 320 | * Description: |
| 321 | * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel |
| 322 | * subsystem. A @domain value of NULL adds a new default domain mapping. |
| 323 | * Returns zero on success, negative values on failure. |
| 324 | * |
| 325 | */ |
| 326 | int netlbl_cfg_cipsov4_map_add(u32 doi, |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 327 | const char *domain, |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 328 | const struct in_addr *addr, |
| 329 | const struct in_addr *mask, |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 330 | struct netlbl_audit *audit_info) |
| 331 | { |
| 332 | int ret_val = -ENOMEM; |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 333 | struct cipso_v4_doi *doi_def; |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 334 | struct netlbl_dom_map *entry; |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 335 | struct netlbl_domaddr_map *addrmap = NULL; |
| 336 | struct netlbl_domaddr4_map *addrinfo = NULL; |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 337 | |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 338 | doi_def = cipso_v4_doi_getdef(doi); |
| 339 | if (doi_def == NULL) |
| 340 | return -ENOENT; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 341 | |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 342 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
| 343 | if (entry == NULL) |
Julia Lawall | 94a80d6 | 2011-08-11 00:06:04 +0000 | [diff] [blame] | 344 | goto out_entry; |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 345 | if (domain != NULL) { |
| 346 | entry->domain = kstrdup(domain, GFP_ATOMIC); |
| 347 | if (entry->domain == NULL) |
Julia Lawall | 94a80d6 | 2011-08-11 00:06:04 +0000 | [diff] [blame] | 348 | goto out_domain; |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 349 | } |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 350 | |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 351 | if (addr == NULL && mask == NULL) { |
| 352 | entry->type_def.cipsov4 = doi_def; |
| 353 | entry->type = NETLBL_NLTYPE_CIPSOV4; |
| 354 | } else if (addr != NULL && mask != NULL) { |
| 355 | addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); |
| 356 | if (addrmap == NULL) |
Julia Lawall | 94a80d6 | 2011-08-11 00:06:04 +0000 | [diff] [blame] | 357 | goto out_addrmap; |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 358 | INIT_LIST_HEAD(&addrmap->list4); |
| 359 | INIT_LIST_HEAD(&addrmap->list6); |
| 360 | |
| 361 | addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC); |
| 362 | if (addrinfo == NULL) |
Julia Lawall | 94a80d6 | 2011-08-11 00:06:04 +0000 | [diff] [blame] | 363 | goto out_addrinfo; |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 364 | addrinfo->type_def.cipsov4 = doi_def; |
| 365 | addrinfo->type = NETLBL_NLTYPE_CIPSOV4; |
| 366 | addrinfo->list.addr = addr->s_addr & mask->s_addr; |
| 367 | addrinfo->list.mask = mask->s_addr; |
| 368 | addrinfo->list.valid = 1; |
| 369 | ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4); |
| 370 | if (ret_val != 0) |
| 371 | goto cfg_cipsov4_map_add_failure; |
| 372 | |
| 373 | entry->type_def.addrsel = addrmap; |
| 374 | entry->type = NETLBL_NLTYPE_ADDRSELECT; |
| 375 | } else { |
| 376 | ret_val = -EINVAL; |
Julia Lawall | 94a80d6 | 2011-08-11 00:06:04 +0000 | [diff] [blame] | 377 | goto out_addrmap; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 378 | } |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 379 | |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 380 | ret_val = netlbl_domhsh_add(entry, audit_info); |
| 381 | if (ret_val != 0) |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 382 | goto cfg_cipsov4_map_add_failure; |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 383 | |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 384 | return 0; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 385 | |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 386 | cfg_cipsov4_map_add_failure: |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 387 | kfree(addrinfo); |
Julia Lawall | 94a80d6 | 2011-08-11 00:06:04 +0000 | [diff] [blame] | 388 | out_addrinfo: |
| 389 | kfree(addrmap); |
| 390 | out_addrmap: |
| 391 | kfree(entry->domain); |
| 392 | out_domain: |
| 393 | kfree(entry); |
| 394 | out_entry: |
| 395 | cipso_v4_doi_putdef(doi_def); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 396 | return ret_val; |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 397 | } |
| 398 | |
Paul Moore | eda61d3 | 2008-02-04 22:29:47 -0800 | [diff] [blame] | 399 | /* |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 400 | * Security Attribute Functions |
| 401 | */ |
| 402 | |
| 403 | /** |
| 404 | * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit |
| 405 | * @catmap: the category bitmap |
| 406 | * @offset: the offset to start searching at, in bits |
| 407 | * |
| 408 | * Description: |
| 409 | * This function walks a LSM secattr category bitmap starting at @offset and |
| 410 | * returns the spot of the first set bit or -ENOENT if no bits are set. |
| 411 | * |
| 412 | */ |
| 413 | int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap, |
| 414 | u32 offset) |
| 415 | { |
| 416 | struct netlbl_lsm_secattr_catmap *iter = catmap; |
| 417 | u32 node_idx; |
| 418 | u32 node_bit; |
| 419 | NETLBL_CATMAP_MAPTYPE bitmap; |
| 420 | |
| 421 | if (offset > iter->startbit) { |
| 422 | while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { |
| 423 | iter = iter->next; |
| 424 | if (iter == NULL) |
| 425 | return -ENOENT; |
| 426 | } |
| 427 | node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; |
| 428 | node_bit = offset - iter->startbit - |
| 429 | (NETLBL_CATMAP_MAPSIZE * node_idx); |
| 430 | } else { |
| 431 | node_idx = 0; |
| 432 | node_bit = 0; |
| 433 | } |
| 434 | bitmap = iter->bitmap[node_idx] >> node_bit; |
| 435 | |
| 436 | for (;;) { |
| 437 | if (bitmap != 0) { |
| 438 | while ((bitmap & NETLBL_CATMAP_BIT) == 0) { |
| 439 | bitmap >>= 1; |
| 440 | node_bit++; |
| 441 | } |
| 442 | return iter->startbit + |
| 443 | (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit; |
| 444 | } |
| 445 | if (++node_idx >= NETLBL_CATMAP_MAPCNT) { |
| 446 | if (iter->next != NULL) { |
| 447 | iter = iter->next; |
| 448 | node_idx = 0; |
| 449 | } else |
| 450 | return -ENOENT; |
| 451 | } |
| 452 | bitmap = iter->bitmap[node_idx]; |
| 453 | node_bit = 0; |
| 454 | } |
| 455 | |
| 456 | return -ENOENT; |
| 457 | } |
| 458 | |
| 459 | /** |
| 460 | * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits |
| 461 | * @catmap: the category bitmap |
| 462 | * @offset: the offset to start searching at, in bits |
| 463 | * |
| 464 | * Description: |
| 465 | * This function walks a LSM secattr category bitmap starting at @offset and |
| 466 | * returns the spot of the first cleared bit or -ENOENT if the offset is past |
| 467 | * the end of the bitmap. |
| 468 | * |
| 469 | */ |
| 470 | int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap, |
| 471 | u32 offset) |
| 472 | { |
| 473 | struct netlbl_lsm_secattr_catmap *iter = catmap; |
| 474 | u32 node_idx; |
| 475 | u32 node_bit; |
| 476 | NETLBL_CATMAP_MAPTYPE bitmask; |
| 477 | NETLBL_CATMAP_MAPTYPE bitmap; |
| 478 | |
| 479 | if (offset > iter->startbit) { |
| 480 | while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { |
| 481 | iter = iter->next; |
| 482 | if (iter == NULL) |
| 483 | return -ENOENT; |
| 484 | } |
| 485 | node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; |
| 486 | node_bit = offset - iter->startbit - |
| 487 | (NETLBL_CATMAP_MAPSIZE * node_idx); |
| 488 | } else { |
| 489 | node_idx = 0; |
| 490 | node_bit = 0; |
| 491 | } |
| 492 | bitmask = NETLBL_CATMAP_BIT << node_bit; |
| 493 | |
| 494 | for (;;) { |
| 495 | bitmap = iter->bitmap[node_idx]; |
| 496 | while (bitmask != 0 && (bitmap & bitmask) != 0) { |
| 497 | bitmask <<= 1; |
| 498 | node_bit++; |
| 499 | } |
| 500 | |
| 501 | if (bitmask != 0) |
| 502 | return iter->startbit + |
| 503 | (NETLBL_CATMAP_MAPSIZE * node_idx) + |
| 504 | node_bit - 1; |
| 505 | else if (++node_idx >= NETLBL_CATMAP_MAPCNT) { |
| 506 | if (iter->next == NULL) |
| 507 | return iter->startbit + NETLBL_CATMAP_SIZE - 1; |
| 508 | iter = iter->next; |
| 509 | node_idx = 0; |
| 510 | } |
| 511 | bitmask = NETLBL_CATMAP_BIT; |
| 512 | node_bit = 0; |
| 513 | } |
| 514 | |
| 515 | return -ENOENT; |
| 516 | } |
| 517 | |
| 518 | /** |
| 519 | * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap |
| 520 | * @catmap: the category bitmap |
| 521 | * @bit: the bit to set |
| 522 | * @flags: memory allocation flags |
| 523 | * |
| 524 | * Description: |
| 525 | * Set the bit specified by @bit in @catmap. Returns zero on success, |
| 526 | * negative values on failure. |
| 527 | * |
| 528 | */ |
| 529 | int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap, |
| 530 | u32 bit, |
| 531 | gfp_t flags) |
| 532 | { |
| 533 | struct netlbl_lsm_secattr_catmap *iter = catmap; |
| 534 | u32 node_bit; |
| 535 | u32 node_idx; |
| 536 | |
| 537 | while (iter->next != NULL && |
| 538 | bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) |
| 539 | iter = iter->next; |
| 540 | if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) { |
| 541 | iter->next = netlbl_secattr_catmap_alloc(flags); |
| 542 | if (iter->next == NULL) |
| 543 | return -ENOMEM; |
| 544 | iter = iter->next; |
| 545 | iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1); |
| 546 | } |
| 547 | |
| 548 | /* gcc always rounds to zero when doing integer division */ |
| 549 | node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE; |
| 550 | node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx); |
| 551 | iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit; |
| 552 | |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | /** |
| 557 | * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap |
| 558 | * @catmap: the category bitmap |
| 559 | * @start: the starting bit |
| 560 | * @end: the last bit in the string |
| 561 | * @flags: memory allocation flags |
| 562 | * |
| 563 | * Description: |
| 564 | * Set a range of bits, starting at @start and ending with @end. Returns zero |
| 565 | * on success, negative values on failure. |
| 566 | * |
| 567 | */ |
| 568 | int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap, |
| 569 | u32 start, |
| 570 | u32 end, |
| 571 | gfp_t flags) |
| 572 | { |
| 573 | int ret_val = 0; |
| 574 | struct netlbl_lsm_secattr_catmap *iter = catmap; |
| 575 | u32 iter_max_spot; |
| 576 | u32 spot; |
| 577 | |
| 578 | /* XXX - This could probably be made a bit faster by combining writes |
| 579 | * to the catmap instead of setting a single bit each time, but for |
| 580 | * right now skipping to the start of the range in the catmap should |
| 581 | * be a nice improvement over calling the individual setbit function |
| 582 | * repeatedly from a loop. */ |
| 583 | |
| 584 | while (iter->next != NULL && |
| 585 | start >= (iter->startbit + NETLBL_CATMAP_SIZE)) |
| 586 | iter = iter->next; |
| 587 | iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; |
| 588 | |
| 589 | for (spot = start; spot <= end && ret_val == 0; spot++) { |
| 590 | if (spot >= iter_max_spot && iter->next != NULL) { |
| 591 | iter = iter->next; |
| 592 | iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; |
| 593 | } |
| 594 | ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC); |
| 595 | } |
| 596 | |
| 597 | return ret_val; |
| 598 | } |
| 599 | |
| 600 | /* |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 601 | * LSM Functions |
| 602 | */ |
| 603 | |
| 604 | /** |
Paul Moore | 23bcdc1 | 2007-07-18 12:28:45 -0400 | [diff] [blame] | 605 | * netlbl_enabled - Determine if the NetLabel subsystem is enabled |
| 606 | * |
| 607 | * Description: |
| 608 | * The LSM can use this function to determine if it should use NetLabel |
| 609 | * security attributes in it's enforcement mechanism. Currently, NetLabel is |
| 610 | * considered to be enabled when it's configuration contains a valid setup for |
| 611 | * at least one labeled protocol (i.e. NetLabel can understand incoming |
| 612 | * labeled packets of at least one type); otherwise NetLabel is considered to |
| 613 | * be disabled. |
| 614 | * |
| 615 | */ |
| 616 | int netlbl_enabled(void) |
| 617 | { |
| 618 | /* At some point we probably want to expose this mechanism to the user |
| 619 | * as well so that admins can toggle NetLabel regardless of the |
| 620 | * configuration */ |
Paul Moore | c783f1c | 2008-01-29 08:37:52 -0500 | [diff] [blame] | 621 | return (atomic_read(&netlabel_mgmt_protocount) > 0); |
Paul Moore | 23bcdc1 | 2007-07-18 12:28:45 -0400 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | /** |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 625 | * netlbl_sock_setattr - Label a socket using the correct protocol |
Paul Moore | ba6ff9f | 2007-06-07 18:37:15 -0700 | [diff] [blame] | 626 | * @sk: the socket to label |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 627 | * @family: protocol family |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 628 | * @secattr: the security attributes |
| 629 | * |
| 630 | * Description: |
| 631 | * Attach the correct label to the given socket using the security attributes |
Paul Moore | ba6ff9f | 2007-06-07 18:37:15 -0700 | [diff] [blame] | 632 | * specified in @secattr. This function requires exclusive access to @sk, |
| 633 | * which means it either needs to be in the process of being created or locked. |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 634 | * Returns zero on success, -EDESTADDRREQ if the domain is configured to use |
| 635 | * network address selectors (can't blindly label the socket), and negative |
| 636 | * values on all other failures. |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 637 | * |
| 638 | */ |
Paul Moore | ba6ff9f | 2007-06-07 18:37:15 -0700 | [diff] [blame] | 639 | int netlbl_sock_setattr(struct sock *sk, |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 640 | u16 family, |
Paul Moore | ba6ff9f | 2007-06-07 18:37:15 -0700 | [diff] [blame] | 641 | const struct netlbl_lsm_secattr *secattr) |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 642 | { |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 643 | int ret_val; |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 644 | struct netlbl_dom_map *dom_entry; |
| 645 | |
| 646 | rcu_read_lock(); |
| 647 | dom_entry = netlbl_domhsh_getentry(secattr->domain); |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 648 | if (dom_entry == NULL) { |
| 649 | ret_val = -ENOENT; |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 650 | goto socket_setattr_return; |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 651 | } |
| 652 | switch (family) { |
| 653 | case AF_INET: |
| 654 | switch (dom_entry->type) { |
| 655 | case NETLBL_NLTYPE_ADDRSELECT: |
| 656 | ret_val = -EDESTADDRREQ; |
| 657 | break; |
| 658 | case NETLBL_NLTYPE_CIPSOV4: |
| 659 | ret_val = cipso_v4_sock_setattr(sk, |
| 660 | dom_entry->type_def.cipsov4, |
| 661 | secattr); |
| 662 | break; |
| 663 | case NETLBL_NLTYPE_UNLABELED: |
| 664 | ret_val = 0; |
| 665 | break; |
| 666 | default: |
| 667 | ret_val = -ENOENT; |
| 668 | } |
Paul Moore | 63c4168 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 669 | break; |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 670 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 671 | case AF_INET6: |
| 672 | /* since we don't support any IPv6 labeling protocols right |
| 673 | * now we can optimize everything away until we do */ |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 674 | ret_val = 0; |
| 675 | break; |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 676 | #endif /* IPv6 */ |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 677 | default: |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 678 | ret_val = -EPROTONOSUPPORT; |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 679 | } |
| 680 | |
| 681 | socket_setattr_return: |
| 682 | rcu_read_unlock(); |
| 683 | return ret_val; |
| 684 | } |
| 685 | |
| 686 | /** |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 687 | * netlbl_sock_delattr - Delete all the NetLabel labels on a socket |
| 688 | * @sk: the socket |
| 689 | * |
| 690 | * Description: |
| 691 | * Remove all the NetLabel labeling from @sk. The caller is responsible for |
| 692 | * ensuring that @sk is locked. |
| 693 | * |
| 694 | */ |
| 695 | void netlbl_sock_delattr(struct sock *sk) |
| 696 | { |
| 697 | cipso_v4_sock_delattr(sk); |
| 698 | } |
| 699 | |
| 700 | /** |
Paul Moore | 14a72f5 | 2006-09-25 15:52:01 -0700 | [diff] [blame] | 701 | * netlbl_sock_getattr - Determine the security attributes of a sock |
| 702 | * @sk: the sock |
| 703 | * @secattr: the security attributes |
| 704 | * |
| 705 | * Description: |
Paul Moore | 8cc4457 | 2008-01-29 08:44:21 -0500 | [diff] [blame] | 706 | * Examines the given sock to see if any NetLabel style labeling has been |
Paul Moore | 14a72f5 | 2006-09-25 15:52:01 -0700 | [diff] [blame] | 707 | * applied to the sock, if so it parses the socket label and returns the |
| 708 | * security attributes in @secattr. Returns zero on success, negative values |
| 709 | * on failure. |
| 710 | * |
| 711 | */ |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 712 | int netlbl_sock_getattr(struct sock *sk, |
| 713 | struct netlbl_lsm_secattr *secattr) |
Paul Moore | 14a72f5 | 2006-09-25 15:52:01 -0700 | [diff] [blame] | 714 | { |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 715 | int ret_val; |
| 716 | |
| 717 | switch (sk->sk_family) { |
| 718 | case AF_INET: |
| 719 | ret_val = cipso_v4_sock_getattr(sk, secattr); |
| 720 | break; |
| 721 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 722 | case AF_INET6: |
| 723 | ret_val = -ENOMSG; |
| 724 | break; |
| 725 | #endif /* IPv6 */ |
| 726 | default: |
| 727 | ret_val = -EPROTONOSUPPORT; |
| 728 | } |
| 729 | |
| 730 | return ret_val; |
Paul Moore | 14a72f5 | 2006-09-25 15:52:01 -0700 | [diff] [blame] | 731 | } |
| 732 | |
| 733 | /** |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 734 | * netlbl_conn_setattr - Label a connected socket using the correct protocol |
| 735 | * @sk: the socket to label |
| 736 | * @addr: the destination address |
| 737 | * @secattr: the security attributes |
| 738 | * |
| 739 | * Description: |
| 740 | * Attach the correct label to the given connected socket using the security |
| 741 | * attributes specified in @secattr. The caller is responsible for ensuring |
| 742 | * that @sk is locked. Returns zero on success, negative values on failure. |
| 743 | * |
| 744 | */ |
| 745 | int netlbl_conn_setattr(struct sock *sk, |
| 746 | struct sockaddr *addr, |
| 747 | const struct netlbl_lsm_secattr *secattr) |
| 748 | { |
| 749 | int ret_val; |
| 750 | struct sockaddr_in *addr4; |
| 751 | struct netlbl_domaddr4_map *af4_entry; |
| 752 | |
| 753 | rcu_read_lock(); |
| 754 | switch (addr->sa_family) { |
| 755 | case AF_INET: |
| 756 | addr4 = (struct sockaddr_in *)addr; |
| 757 | af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, |
| 758 | addr4->sin_addr.s_addr); |
| 759 | if (af4_entry == NULL) { |
| 760 | ret_val = -ENOENT; |
| 761 | goto conn_setattr_return; |
| 762 | } |
| 763 | switch (af4_entry->type) { |
| 764 | case NETLBL_NLTYPE_CIPSOV4: |
| 765 | ret_val = cipso_v4_sock_setattr(sk, |
| 766 | af4_entry->type_def.cipsov4, |
| 767 | secattr); |
| 768 | break; |
| 769 | case NETLBL_NLTYPE_UNLABELED: |
| 770 | /* just delete the protocols we support for right now |
| 771 | * but we could remove other protocols if needed */ |
| 772 | cipso_v4_sock_delattr(sk); |
| 773 | ret_val = 0; |
| 774 | break; |
| 775 | default: |
| 776 | ret_val = -ENOENT; |
| 777 | } |
| 778 | break; |
| 779 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 780 | case AF_INET6: |
| 781 | /* since we don't support any IPv6 labeling protocols right |
| 782 | * now we can optimize everything away until we do */ |
| 783 | ret_val = 0; |
| 784 | break; |
| 785 | #endif /* IPv6 */ |
| 786 | default: |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 787 | ret_val = -EPROTONOSUPPORT; |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 788 | } |
| 789 | |
| 790 | conn_setattr_return: |
| 791 | rcu_read_unlock(); |
| 792 | return ret_val; |
| 793 | } |
| 794 | |
| 795 | /** |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 796 | * netlbl_req_setattr - Label a request socket using the correct protocol |
| 797 | * @req: the request socket to label |
| 798 | * @secattr: the security attributes |
| 799 | * |
| 800 | * Description: |
| 801 | * Attach the correct label to the given socket using the security attributes |
| 802 | * specified in @secattr. Returns zero on success, negative values on failure. |
| 803 | * |
| 804 | */ |
| 805 | int netlbl_req_setattr(struct request_sock *req, |
| 806 | const struct netlbl_lsm_secattr *secattr) |
| 807 | { |
| 808 | int ret_val; |
| 809 | struct netlbl_dom_map *dom_entry; |
| 810 | struct netlbl_domaddr4_map *af4_entry; |
| 811 | u32 proto_type; |
| 812 | struct cipso_v4_doi *proto_cv4; |
| 813 | |
| 814 | rcu_read_lock(); |
| 815 | dom_entry = netlbl_domhsh_getentry(secattr->domain); |
| 816 | if (dom_entry == NULL) { |
| 817 | ret_val = -ENOENT; |
| 818 | goto req_setattr_return; |
| 819 | } |
| 820 | switch (req->rsk_ops->family) { |
| 821 | case AF_INET: |
| 822 | if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) { |
| 823 | struct inet_request_sock *req_inet = inet_rsk(req); |
| 824 | af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, |
| 825 | req_inet->rmt_addr); |
| 826 | if (af4_entry == NULL) { |
| 827 | ret_val = -ENOENT; |
| 828 | goto req_setattr_return; |
| 829 | } |
| 830 | proto_type = af4_entry->type; |
| 831 | proto_cv4 = af4_entry->type_def.cipsov4; |
| 832 | } else { |
| 833 | proto_type = dom_entry->type; |
| 834 | proto_cv4 = dom_entry->type_def.cipsov4; |
| 835 | } |
| 836 | switch (proto_type) { |
| 837 | case NETLBL_NLTYPE_CIPSOV4: |
| 838 | ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr); |
| 839 | break; |
| 840 | case NETLBL_NLTYPE_UNLABELED: |
| 841 | /* just delete the protocols we support for right now |
| 842 | * but we could remove other protocols if needed */ |
| 843 | cipso_v4_req_delattr(req); |
| 844 | ret_val = 0; |
| 845 | break; |
| 846 | default: |
| 847 | ret_val = -ENOENT; |
| 848 | } |
| 849 | break; |
| 850 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 851 | case AF_INET6: |
| 852 | /* since we don't support any IPv6 labeling protocols right |
| 853 | * now we can optimize everything away until we do */ |
| 854 | ret_val = 0; |
| 855 | break; |
| 856 | #endif /* IPv6 */ |
| 857 | default: |
| 858 | ret_val = -EPROTONOSUPPORT; |
| 859 | } |
| 860 | |
| 861 | req_setattr_return: |
| 862 | rcu_read_unlock(); |
| 863 | return ret_val; |
| 864 | } |
| 865 | |
| 866 | /** |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 867 | * netlbl_req_delattr - Delete all the NetLabel labels on a socket |
| 868 | * @req: the socket |
| 869 | * |
| 870 | * Description: |
| 871 | * Remove all the NetLabel labeling from @req. |
| 872 | * |
| 873 | */ |
| 874 | void netlbl_req_delattr(struct request_sock *req) |
| 875 | { |
| 876 | cipso_v4_req_delattr(req); |
| 877 | } |
| 878 | |
| 879 | /** |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 880 | * netlbl_skbuff_setattr - Label a packet using the correct protocol |
| 881 | * @skb: the packet |
| 882 | * @family: protocol family |
| 883 | * @secattr: the security attributes |
| 884 | * |
| 885 | * Description: |
| 886 | * Attach the correct label to the given packet using the security attributes |
| 887 | * specified in @secattr. Returns zero on success, negative values on failure. |
| 888 | * |
| 889 | */ |
| 890 | int netlbl_skbuff_setattr(struct sk_buff *skb, |
| 891 | u16 family, |
| 892 | const struct netlbl_lsm_secattr *secattr) |
| 893 | { |
| 894 | int ret_val; |
| 895 | struct iphdr *hdr4; |
| 896 | struct netlbl_domaddr4_map *af4_entry; |
| 897 | |
| 898 | rcu_read_lock(); |
| 899 | switch (family) { |
| 900 | case AF_INET: |
| 901 | hdr4 = ip_hdr(skb); |
| 902 | af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, |
| 903 | hdr4->daddr); |
| 904 | if (af4_entry == NULL) { |
| 905 | ret_val = -ENOENT; |
| 906 | goto skbuff_setattr_return; |
| 907 | } |
| 908 | switch (af4_entry->type) { |
| 909 | case NETLBL_NLTYPE_CIPSOV4: |
| 910 | ret_val = cipso_v4_skbuff_setattr(skb, |
| 911 | af4_entry->type_def.cipsov4, |
| 912 | secattr); |
| 913 | break; |
| 914 | case NETLBL_NLTYPE_UNLABELED: |
| 915 | /* just delete the protocols we support for right now |
| 916 | * but we could remove other protocols if needed */ |
| 917 | ret_val = cipso_v4_skbuff_delattr(skb); |
| 918 | break; |
| 919 | default: |
| 920 | ret_val = -ENOENT; |
| 921 | } |
| 922 | break; |
| 923 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 924 | case AF_INET6: |
| 925 | /* since we don't support any IPv6 labeling protocols right |
| 926 | * now we can optimize everything away until we do */ |
| 927 | ret_val = 0; |
| 928 | break; |
| 929 | #endif /* IPv6 */ |
| 930 | default: |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 931 | ret_val = -EPROTONOSUPPORT; |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 932 | } |
| 933 | |
| 934 | skbuff_setattr_return: |
| 935 | rcu_read_unlock(); |
| 936 | return ret_val; |
| 937 | } |
| 938 | |
| 939 | /** |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 940 | * netlbl_skbuff_getattr - Determine the security attributes of a packet |
| 941 | * @skb: the packet |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 942 | * @family: protocol family |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 943 | * @secattr: the security attributes |
| 944 | * |
| 945 | * Description: |
| 946 | * Examines the given packet to see if a recognized form of packet labeling |
| 947 | * is present, if so it parses the packet label and returns the security |
| 948 | * attributes in @secattr. Returns zero on success, negative values on |
| 949 | * failure. |
| 950 | * |
| 951 | */ |
| 952 | int netlbl_skbuff_getattr(const struct sk_buff *skb, |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 953 | u16 family, |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 954 | struct netlbl_lsm_secattr *secattr) |
| 955 | { |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 956 | switch (family) { |
| 957 | case AF_INET: |
| 958 | if (CIPSO_V4_OPTEXIST(skb) && |
| 959 | cipso_v4_skbuff_getattr(skb, secattr) == 0) |
| 960 | return 0; |
| 961 | break; |
| 962 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 963 | case AF_INET6: |
| 964 | break; |
| 965 | #endif /* IPv6 */ |
| 966 | } |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 967 | |
Paul Moore | 8cc4457 | 2008-01-29 08:44:21 -0500 | [diff] [blame] | 968 | return netlbl_unlabel_getattr(skb, family, secattr); |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 969 | } |
| 970 | |
| 971 | /** |
| 972 | * netlbl_skbuff_err - Handle a LSM error on a sk_buff |
| 973 | * @skb: the packet |
| 974 | * @error: the error code |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 975 | * @gateway: true if host is acting as a gateway, false otherwise |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 976 | * |
| 977 | * Description: |
| 978 | * Deal with a LSM problem when handling the packet in @skb, typically this is |
| 979 | * a permission denied problem (-EACCES). The correct action is determined |
| 980 | * according to the packet's labeling protocol. |
| 981 | * |
| 982 | */ |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 983 | void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway) |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 984 | { |
| 985 | if (CIPSO_V4_OPTEXIST(skb)) |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 986 | cipso_v4_error(skb, error, gateway); |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 987 | } |
| 988 | |
| 989 | /** |
| 990 | * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches |
| 991 | * |
| 992 | * Description: |
| 993 | * For all of the NetLabel protocols that support some form of label mapping |
| 994 | * cache, invalidate the cache. Returns zero on success, negative values on |
| 995 | * error. |
| 996 | * |
| 997 | */ |
| 998 | void netlbl_cache_invalidate(void) |
| 999 | { |
| 1000 | cipso_v4_cache_invalidate(); |
| 1001 | } |
| 1002 | |
| 1003 | /** |
| 1004 | * netlbl_cache_add - Add an entry to a NetLabel protocol cache |
| 1005 | * @skb: the packet |
| 1006 | * @secattr: the packet's security attributes |
| 1007 | * |
| 1008 | * Description: |
| 1009 | * Add the LSM security attributes for the given packet to the underlying |
| 1010 | * NetLabel protocol's label mapping cache. Returns zero on success, negative |
| 1011 | * values on error. |
| 1012 | * |
| 1013 | */ |
| 1014 | int netlbl_cache_add(const struct sk_buff *skb, |
| 1015 | const struct netlbl_lsm_secattr *secattr) |
| 1016 | { |
Paul Moore | 701a90b | 2006-11-17 17:38:46 -0500 | [diff] [blame] | 1017 | if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0) |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 1018 | return -ENOMSG; |
| 1019 | |
| 1020 | if (CIPSO_V4_OPTEXIST(skb)) |
| 1021 | return cipso_v4_cache_add(skb, secattr); |
| 1022 | |
| 1023 | return -ENOMSG; |
| 1024 | } |
| 1025 | |
| 1026 | /* |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 1027 | * Protocol Engine Functions |
| 1028 | */ |
| 1029 | |
| 1030 | /** |
| 1031 | * netlbl_audit_start - Start an audit message |
| 1032 | * @type: audit message type |
| 1033 | * @audit_info: NetLabel audit information |
| 1034 | * |
| 1035 | * Description: |
| 1036 | * Start an audit message using the type specified in @type and fill the audit |
| 1037 | * message with some fields common to all NetLabel audit messages. This |
| 1038 | * function should only be used by protocol engines, not LSMs. Returns a |
| 1039 | * pointer to the audit buffer on success, NULL on failure. |
| 1040 | * |
| 1041 | */ |
| 1042 | struct audit_buffer *netlbl_audit_start(int type, |
| 1043 | struct netlbl_audit *audit_info) |
| 1044 | { |
| 1045 | return netlbl_audit_start_common(type, audit_info); |
| 1046 | } |
| 1047 | |
| 1048 | /* |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 1049 | * Setup Functions |
| 1050 | */ |
| 1051 | |
| 1052 | /** |
| 1053 | * netlbl_init - Initialize NetLabel |
| 1054 | * |
| 1055 | * Description: |
| 1056 | * Perform the required NetLabel initialization before first use. |
| 1057 | * |
| 1058 | */ |
| 1059 | static int __init netlbl_init(void) |
| 1060 | { |
| 1061 | int ret_val; |
| 1062 | |
| 1063 | printk(KERN_INFO "NetLabel: Initializing\n"); |
| 1064 | printk(KERN_INFO "NetLabel: domain hash size = %u\n", |
| 1065 | (1 << NETLBL_DOMHSH_BITSIZE)); |
| 1066 | printk(KERN_INFO "NetLabel: protocols =" |
| 1067 | " UNLABELED" |
| 1068 | " CIPSOv4" |
| 1069 | "\n"); |
| 1070 | |
| 1071 | ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE); |
| 1072 | if (ret_val != 0) |
| 1073 | goto init_failure; |
| 1074 | |
Paul Moore | 8cc4457 | 2008-01-29 08:44:21 -0500 | [diff] [blame] | 1075 | ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE); |
| 1076 | if (ret_val != 0) |
| 1077 | goto init_failure; |
| 1078 | |
Paul Moore | d15c345 | 2006-08-03 16:48:37 -0700 | [diff] [blame] | 1079 | ret_val = netlbl_netlink_init(); |
| 1080 | if (ret_val != 0) |
| 1081 | goto init_failure; |
| 1082 | |
| 1083 | ret_val = netlbl_unlabel_defconf(); |
| 1084 | if (ret_val != 0) |
| 1085 | goto init_failure; |
| 1086 | printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n"); |
| 1087 | |
| 1088 | return 0; |
| 1089 | |
| 1090 | init_failure: |
| 1091 | panic("NetLabel: failed to initialize properly (%d)\n", ret_val); |
| 1092 | } |
| 1093 | |
| 1094 | subsys_initcall(netlbl_init); |