blob: de0d8e4cbfb64db0794f3f38ad151e607ec30f2f [file] [log] [blame]
Paul Moored15c3452006-08-03 16:48:37 -07001/*
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 *
9 * Author: Paul Moore <paul.moore@hp.com>
10 *
11 */
12
13/*
Paul Moore63c41682008-10-10 10:16:32 -040014 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
Paul Moored15c3452006-08-03 16:48:37 -070015 *
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
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 *
30 */
31
32#include <linux/types.h>
Franck Bui-Huu82524742008-05-12 21:21:05 +020033#include <linux/rculist.h>
Paul Moored15c3452006-08-03 16:48:37 -070034#include <linux/skbuff.h>
35#include <linux/spinlock.h>
36#include <linux/string.h>
Paul Moore32f50cd2006-09-28 14:51:47 -070037#include <linux/audit.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090038#include <linux/slab.h>
Paul Moored15c3452006-08-03 16:48:37 -070039#include <net/netlabel.h>
40#include <net/cipso_ipv4.h>
41#include <asm/bug.h>
42
43#include "netlabel_mgmt.h"
Paul Moore63c41682008-10-10 10:16:32 -040044#include "netlabel_addrlist.h"
Paul Moored15c3452006-08-03 16:48:37 -070045#include "netlabel_domainhash.h"
Paul Moore32f50cd2006-09-28 14:51:47 -070046#include "netlabel_user.h"
Paul Moored15c3452006-08-03 16:48:37 -070047
48struct netlbl_domhsh_tbl {
49 struct list_head *tbl;
50 u32 size;
51};
52
53/* Domain hash table */
Paul Mooreb914f3a2010-04-01 10:43:57 +000054/* updates should be so rare that having one spinlock for the entire hash table
55 * should be okay */
Adrian Bunk8ce11e62006-08-07 21:50:48 -070056static DEFINE_SPINLOCK(netlbl_domhsh_lock);
Paul Mooreb914f3a2010-04-01 10:43:57 +000057#define netlbl_domhsh_rcu_deref(p) \
58 rcu_dereference_check(p, rcu_read_lock_held() || \
59 lockdep_is_held(&netlbl_domhsh_lock))
Paul Moored15c3452006-08-03 16:48:37 -070060static struct netlbl_domhsh_tbl *netlbl_domhsh = NULL;
Paul Moored15c3452006-08-03 16:48:37 -070061static struct netlbl_dom_map *netlbl_domhsh_def = NULL;
62
63/*
64 * Domain Hash Table Helper Functions
65 */
66
67/**
68 * netlbl_domhsh_free_entry - Frees a domain hash table entry
69 * @entry: the entry's RCU field
70 *
71 * Description:
72 * This function is designed to be used as a callback to the call_rcu()
73 * function so that the memory allocated to a hash table entry can be released
74 * safely.
75 *
76 */
77static void netlbl_domhsh_free_entry(struct rcu_head *entry)
78{
79 struct netlbl_dom_map *ptr;
Paul Moore63c41682008-10-10 10:16:32 -040080 struct netlbl_af4list *iter4;
81 struct netlbl_af4list *tmp4;
82#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
83 struct netlbl_af6list *iter6;
84 struct netlbl_af6list *tmp6;
85#endif /* IPv6 */
Paul Moored15c3452006-08-03 16:48:37 -070086
87 ptr = container_of(entry, struct netlbl_dom_map, rcu);
Paul Moore63c41682008-10-10 10:16:32 -040088 if (ptr->type == NETLBL_NLTYPE_ADDRSELECT) {
89 netlbl_af4list_foreach_safe(iter4, tmp4,
90 &ptr->type_def.addrsel->list4) {
91 netlbl_af4list_remove_entry(iter4);
92 kfree(netlbl_domhsh_addr4_entry(iter4));
93 }
94#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
95 netlbl_af6list_foreach_safe(iter6, tmp6,
96 &ptr->type_def.addrsel->list6) {
97 netlbl_af6list_remove_entry(iter6);
98 kfree(netlbl_domhsh_addr6_entry(iter6));
99 }
100#endif /* IPv6 */
101 }
Paul Moored15c3452006-08-03 16:48:37 -0700102 kfree(ptr->domain);
103 kfree(ptr);
104}
105
106/**
107 * netlbl_domhsh_hash - Hashing function for the domain hash table
108 * @domain: the domain name to hash
109 *
110 * Description:
111 * This is the hashing function for the domain hash table, it returns the
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300112 * correct bucket number for the domain. The caller is responsible for
Paul Mooreb914f3a2010-04-01 10:43:57 +0000113 * ensuring that the hash table is protected with either a RCU read lock or the
114 * hash table lock.
Paul Moored15c3452006-08-03 16:48:37 -0700115 *
116 */
117static u32 netlbl_domhsh_hash(const char *key)
118{
119 u32 iter;
120 u32 val;
121 u32 len;
122
123 /* This is taken (with slight modification) from
124 * security/selinux/ss/symtab.c:symhash() */
125
126 for (iter = 0, val = 0, len = strlen(key); iter < len; iter++)
127 val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter];
Paul Mooreb914f3a2010-04-01 10:43:57 +0000128 return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1);
Paul Moored15c3452006-08-03 16:48:37 -0700129}
130
131/**
132 * netlbl_domhsh_search - Search for a domain entry
133 * @domain: the domain
Paul Moored15c3452006-08-03 16:48:37 -0700134 *
135 * Description:
136 * Searches the domain hash table and returns a pointer to the hash table
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300137 * entry if found, otherwise NULL is returned. The caller is responsible for
Paul Mooreb914f3a2010-04-01 10:43:57 +0000138 * ensuring that the hash table is protected with either a RCU read lock or the
139 * hash table lock.
Paul Moored15c3452006-08-03 16:48:37 -0700140 *
141 */
Paul Mooreb64397e2008-01-29 08:37:54 -0500142static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain)
Paul Moored15c3452006-08-03 16:48:37 -0700143{
144 u32 bkt;
Paul Moore56196702008-10-10 10:16:29 -0400145 struct list_head *bkt_list;
Paul Moored15c3452006-08-03 16:48:37 -0700146 struct netlbl_dom_map *iter;
147
148 if (domain != NULL) {
149 bkt = netlbl_domhsh_hash(domain);
Paul Mooreb914f3a2010-04-01 10:43:57 +0000150 bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt];
Paul Moore56196702008-10-10 10:16:29 -0400151 list_for_each_entry_rcu(iter, bkt_list, list)
Paul Moored15c3452006-08-03 16:48:37 -0700152 if (iter->valid && strcmp(iter->domain, domain) == 0)
153 return iter;
154 }
155
Paul Mooreb64397e2008-01-29 08:37:54 -0500156 return NULL;
157}
158
159/**
160 * netlbl_domhsh_search_def - Search for a domain entry
161 * @domain: the domain
162 * @def: return default if no match is found
163 *
164 * Description:
165 * Searches the domain hash table and returns a pointer to the hash table
166 * entry if an exact match is found, if an exact match is not present in the
167 * hash table then the default entry is returned if valid otherwise NULL is
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300168 * returned. The caller is responsible ensuring that the hash table is
Paul Mooreb914f3a2010-04-01 10:43:57 +0000169 * protected with either a RCU read lock or the hash table lock.
Paul Mooreb64397e2008-01-29 08:37:54 -0500170 *
171 */
172static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain)
173{
174 struct netlbl_dom_map *entry;
175
176 entry = netlbl_domhsh_search(domain);
177 if (entry == NULL) {
Paul Mooreb914f3a2010-04-01 10:43:57 +0000178 entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def);
Pavel Emelyanov4c3a0a22008-02-12 22:15:14 -0800179 if (entry != NULL && !entry->valid)
180 entry = NULL;
Paul Moored15c3452006-08-03 16:48:37 -0700181 }
182
Pavel Emelyanov4c3a0a22008-02-12 22:15:14 -0800183 return entry;
Paul Moored15c3452006-08-03 16:48:37 -0700184}
185
Paul Moore63c41682008-10-10 10:16:32 -0400186/**
187 * netlbl_domhsh_audit_add - Generate an audit entry for an add event
188 * @entry: the entry being added
189 * @addr4: the IPv4 address information
190 * @addr6: the IPv6 address information
191 * @result: the result code
192 * @audit_info: NetLabel audit information
193 *
194 * Description:
195 * Generate an audit record for adding a new NetLabel/LSM mapping entry with
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300196 * the given information. Caller is responsible for holding the necessary
Paul Moore63c41682008-10-10 10:16:32 -0400197 * locks.
198 *
199 */
200static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry,
201 struct netlbl_af4list *addr4,
202 struct netlbl_af6list *addr6,
203 int result,
204 struct netlbl_audit *audit_info)
205{
206 struct audit_buffer *audit_buf;
207 struct cipso_v4_doi *cipsov4 = NULL;
208 u32 type;
209
210 audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info);
211 if (audit_buf != NULL) {
212 audit_log_format(audit_buf, " nlbl_domain=%s",
213 entry->domain ? entry->domain : "(default)");
214 if (addr4 != NULL) {
215 struct netlbl_domaddr4_map *map4;
216 map4 = netlbl_domhsh_addr4_entry(addr4);
217 type = map4->type;
218 cipsov4 = map4->type_def.cipsov4;
219 netlbl_af4list_audit_addr(audit_buf, 0, NULL,
220 addr4->addr, addr4->mask);
221#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
222 } else if (addr6 != NULL) {
223 struct netlbl_domaddr6_map *map6;
224 map6 = netlbl_domhsh_addr6_entry(addr6);
225 type = map6->type;
226 netlbl_af6list_audit_addr(audit_buf, 0, NULL,
227 &addr6->addr, &addr6->mask);
228#endif /* IPv6 */
229 } else {
230 type = entry->type;
231 cipsov4 = entry->type_def.cipsov4;
232 }
233 switch (type) {
234 case NETLBL_NLTYPE_UNLABELED:
235 audit_log_format(audit_buf, " nlbl_protocol=unlbl");
236 break;
237 case NETLBL_NLTYPE_CIPSOV4:
238 BUG_ON(cipsov4 == NULL);
239 audit_log_format(audit_buf,
240 " nlbl_protocol=cipsov4 cipso_doi=%u",
241 cipsov4->doi);
242 break;
243 }
244 audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0);
245 audit_log_end(audit_buf);
246 }
247}
248
Paul Moored15c3452006-08-03 16:48:37 -0700249/*
250 * Domain Hash Table Functions
251 */
252
253/**
254 * netlbl_domhsh_init - Init for the domain hash
255 * @size: the number of bits to use for the hash buckets
256 *
257 * Description:
258 * Initializes the domain hash table, should be called only by
259 * netlbl_user_init() during initialization. Returns zero on success, non-zero
260 * values on error.
261 *
262 */
Pavel Emelyanov05705e42008-02-17 22:33:57 -0800263int __init netlbl_domhsh_init(u32 size)
Paul Moored15c3452006-08-03 16:48:37 -0700264{
265 u32 iter;
266 struct netlbl_domhsh_tbl *hsh_tbl;
267
268 if (size == 0)
269 return -EINVAL;
270
271 hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
272 if (hsh_tbl == NULL)
273 return -ENOMEM;
274 hsh_tbl->size = 1 << size;
275 hsh_tbl->tbl = kcalloc(hsh_tbl->size,
276 sizeof(struct list_head),
277 GFP_KERNEL);
278 if (hsh_tbl->tbl == NULL) {
279 kfree(hsh_tbl);
280 return -ENOMEM;
281 }
282 for (iter = 0; iter < hsh_tbl->size; iter++)
283 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
284
Paul Moored15c3452006-08-03 16:48:37 -0700285 spin_lock(&netlbl_domhsh_lock);
286 rcu_assign_pointer(netlbl_domhsh, hsh_tbl);
287 spin_unlock(&netlbl_domhsh_lock);
Paul Moored15c3452006-08-03 16:48:37 -0700288
289 return 0;
290}
291
292/**
293 * netlbl_domhsh_add - Adds a entry to the domain hash table
294 * @entry: the entry to add
Paul Moore95d4e6b2006-09-29 17:05:05 -0700295 * @audit_info: NetLabel audit information
Paul Moored15c3452006-08-03 16:48:37 -0700296 *
297 * Description:
298 * Adds a new entry to the domain hash table and handles any updates to the
299 * lower level protocol handler (i.e. CIPSO). Returns zero on success,
300 * negative on failure.
301 *
302 */
Paul Moore95d4e6b2006-09-29 17:05:05 -0700303int netlbl_domhsh_add(struct netlbl_dom_map *entry,
304 struct netlbl_audit *audit_info)
Paul Moored15c3452006-08-03 16:48:37 -0700305{
Paul Moore63c41682008-10-10 10:16:32 -0400306 int ret_val = 0;
307 struct netlbl_dom_map *entry_old;
308 struct netlbl_af4list *iter4;
309 struct netlbl_af4list *tmp4;
310#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
311 struct netlbl_af6list *iter6;
312 struct netlbl_af6list *tmp6;
313#endif /* IPv6 */
Paul Moored15c3452006-08-03 16:48:37 -0700314
Paul Mooreb914f3a2010-04-01 10:43:57 +0000315 /* XXX - we can remove this RCU read lock as the spinlock protects the
316 * entire function, but before we do we need to fixup the
317 * netlbl_af[4,6]list RCU functions to do "the right thing" with
318 * respect to rcu_dereference() when only a spinlock is held. */
Paul Moored15c3452006-08-03 16:48:37 -0700319 rcu_read_lock();
Paul Moore1c3fad92008-01-29 08:37:57 -0500320 spin_lock(&netlbl_domhsh_lock);
Paul Moore63c41682008-10-10 10:16:32 -0400321 if (entry->domain != NULL)
322 entry_old = netlbl_domhsh_search(entry->domain);
323 else
324 entry_old = netlbl_domhsh_search_def(entry->domain);
325 if (entry_old == NULL) {
326 entry->valid = 1;
Paul Moore63c41682008-10-10 10:16:32 -0400327
328 if (entry->domain != NULL) {
329 u32 bkt = netlbl_domhsh_hash(entry->domain);
Paul Moored15c3452006-08-03 16:48:37 -0700330 list_add_tail_rcu(&entry->list,
Paul Moore3482fd92007-08-07 17:53:10 -0700331 &rcu_dereference(netlbl_domhsh)->tbl[bkt]);
Paul Moore63c41682008-10-10 10:16:32 -0400332 } else {
333 INIT_LIST_HEAD(&entry->list);
Paul Moored15c3452006-08-03 16:48:37 -0700334 rcu_assign_pointer(netlbl_domhsh_def, entry);
Paul Moorede646882006-11-17 17:38:55 -0500335 }
Paul Moored15c3452006-08-03 16:48:37 -0700336
Paul Moore63c41682008-10-10 10:16:32 -0400337 if (entry->type == NETLBL_NLTYPE_ADDRSELECT) {
338 netlbl_af4list_foreach_rcu(iter4,
339 &entry->type_def.addrsel->list4)
340 netlbl_domhsh_audit_add(entry, iter4, NULL,
341 ret_val, audit_info);
342#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
343 netlbl_af6list_foreach_rcu(iter6,
344 &entry->type_def.addrsel->list6)
345 netlbl_domhsh_audit_add(entry, NULL, iter6,
346 ret_val, audit_info);
347#endif /* IPv6 */
348 } else
349 netlbl_domhsh_audit_add(entry, NULL, NULL,
350 ret_val, audit_info);
351 } else if (entry_old->type == NETLBL_NLTYPE_ADDRSELECT &&
352 entry->type == NETLBL_NLTYPE_ADDRSELECT) {
353 struct list_head *old_list4;
354 struct list_head *old_list6;
355
356 old_list4 = &entry_old->type_def.addrsel->list4;
357 old_list6 = &entry_old->type_def.addrsel->list6;
358
359 /* we only allow the addition of address selectors if all of
360 * the selectors do not exist in the existing domain map */
361 netlbl_af4list_foreach_rcu(iter4,
362 &entry->type_def.addrsel->list4)
363 if (netlbl_af4list_search_exact(iter4->addr,
364 iter4->mask,
365 old_list4)) {
366 ret_val = -EEXIST;
367 goto add_return;
368 }
369#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
370 netlbl_af6list_foreach_rcu(iter6,
371 &entry->type_def.addrsel->list6)
372 if (netlbl_af6list_search_exact(&iter6->addr,
373 &iter6->mask,
374 old_list6)) {
375 ret_val = -EEXIST;
376 goto add_return;
377 }
378#endif /* IPv6 */
379
380 netlbl_af4list_foreach_safe(iter4, tmp4,
381 &entry->type_def.addrsel->list4) {
382 netlbl_af4list_remove_entry(iter4);
383 iter4->valid = 1;
384 ret_val = netlbl_af4list_add(iter4, old_list4);
385 netlbl_domhsh_audit_add(entry_old, iter4, NULL,
386 ret_val, audit_info);
387 if (ret_val != 0)
388 goto add_return;
389 }
390#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
391 netlbl_af6list_foreach_safe(iter6, tmp6,
392 &entry->type_def.addrsel->list6) {
393 netlbl_af6list_remove_entry(iter6);
394 iter6->valid = 1;
395 ret_val = netlbl_af6list_add(iter6, old_list6);
396 netlbl_domhsh_audit_add(entry_old, NULL, iter6,
397 ret_val, audit_info);
398 if (ret_val != 0)
399 goto add_return;
400 }
401#endif /* IPv6 */
402 } else
403 ret_val = -EINVAL;
404
405add_return:
406 spin_unlock(&netlbl_domhsh_lock);
407 rcu_read_unlock();
Paul Moored15c3452006-08-03 16:48:37 -0700408 return ret_val;
409}
410
411/**
412 * netlbl_domhsh_add_default - Adds the default entry to the domain hash table
413 * @entry: the entry to add
Paul Moore95d4e6b2006-09-29 17:05:05 -0700414 * @audit_info: NetLabel audit information
Paul Moored15c3452006-08-03 16:48:37 -0700415 *
416 * Description:
417 * Adds a new default entry to the domain hash table and handles any updates
418 * to the lower level protocol handler (i.e. CIPSO). Returns zero on success,
419 * negative on failure.
420 *
421 */
Paul Moore95d4e6b2006-09-29 17:05:05 -0700422int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
423 struct netlbl_audit *audit_info)
Paul Moored15c3452006-08-03 16:48:37 -0700424{
Paul Moore95d4e6b2006-09-29 17:05:05 -0700425 return netlbl_domhsh_add(entry, audit_info);
Paul Moored15c3452006-08-03 16:48:37 -0700426}
427
428/**
Paul Mooreb1edeb12008-10-10 10:16:31 -0400429 * netlbl_domhsh_remove_entry - Removes a given entry from the domain table
430 * @entry: the entry to remove
431 * @audit_info: NetLabel audit information
432 *
433 * Description:
434 * Removes an entry from the domain hash table and handles any updates to the
435 * lower level protocol handler (i.e. CIPSO). Caller is responsible for
436 * ensuring that the RCU read lock is held. Returns zero on success, negative
437 * on failure.
438 *
439 */
440int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
441 struct netlbl_audit *audit_info)
442{
443 int ret_val = 0;
444 struct audit_buffer *audit_buf;
445
446 if (entry == NULL)
447 return -ENOENT;
448
449 spin_lock(&netlbl_domhsh_lock);
450 if (entry->valid) {
451 entry->valid = 0;
452 if (entry != rcu_dereference(netlbl_domhsh_def))
453 list_del_rcu(&entry->list);
454 else
455 rcu_assign_pointer(netlbl_domhsh_def, NULL);
456 } else
457 ret_val = -ENOENT;
458 spin_unlock(&netlbl_domhsh_lock);
459
460 audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info);
461 if (audit_buf != NULL) {
462 audit_log_format(audit_buf,
463 " nlbl_domain=%s res=%u",
464 entry->domain ? entry->domain : "(default)",
465 ret_val == 0 ? 1 : 0);
466 audit_log_end(audit_buf);
467 }
468
469 if (ret_val == 0) {
Paul Moore63c41682008-10-10 10:16:32 -0400470 struct netlbl_af4list *iter4;
471 struct netlbl_domaddr4_map *map4;
472
Paul Mooreb1edeb12008-10-10 10:16:31 -0400473 switch (entry->type) {
Paul Moore63c41682008-10-10 10:16:32 -0400474 case NETLBL_NLTYPE_ADDRSELECT:
475 netlbl_af4list_foreach_rcu(iter4,
476 &entry->type_def.addrsel->list4) {
477 map4 = netlbl_domhsh_addr4_entry(iter4);
478 cipso_v4_doi_putdef(map4->type_def.cipsov4);
479 }
480 /* no need to check the IPv6 list since we currently
481 * support only unlabeled protocols for IPv6 */
482 break;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400483 case NETLBL_NLTYPE_CIPSOV4:
484 cipso_v4_doi_putdef(entry->type_def.cipsov4);
485 break;
486 }
487 call_rcu(&entry->rcu, netlbl_domhsh_free_entry);
488 }
489
490 return ret_val;
491}
492
493/**
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500494 * netlbl_domhsh_remove_af4 - Removes an address selector entry
495 * @domain: the domain
496 * @addr: IPv4 address
497 * @mask: IPv4 address mask
498 * @audit_info: NetLabel audit information
499 *
500 * Description:
501 * Removes an individual address selector from a domain mapping and potentially
502 * the entire mapping if it is empty. Returns zero on success, negative values
503 * on failure.
504 *
505 */
506int netlbl_domhsh_remove_af4(const char *domain,
507 const struct in_addr *addr,
508 const struct in_addr *mask,
509 struct netlbl_audit *audit_info)
510{
511 struct netlbl_dom_map *entry_map;
512 struct netlbl_af4list *entry_addr;
513 struct netlbl_af4list *iter4;
514#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
515 struct netlbl_af6list *iter6;
516#endif /* IPv6 */
517 struct netlbl_domaddr4_map *entry;
518
519 rcu_read_lock();
520
521 if (domain)
522 entry_map = netlbl_domhsh_search(domain);
523 else
524 entry_map = netlbl_domhsh_search_def(domain);
525 if (entry_map == NULL || entry_map->type != NETLBL_NLTYPE_ADDRSELECT)
526 goto remove_af4_failure;
527
528 spin_lock(&netlbl_domhsh_lock);
529 entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
530 &entry_map->type_def.addrsel->list4);
531 spin_unlock(&netlbl_domhsh_lock);
532
533 if (entry_addr == NULL)
534 goto remove_af4_failure;
535 netlbl_af4list_foreach_rcu(iter4, &entry_map->type_def.addrsel->list4)
536 goto remove_af4_single_addr;
537#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
538 netlbl_af6list_foreach_rcu(iter6, &entry_map->type_def.addrsel->list6)
539 goto remove_af4_single_addr;
540#endif /* IPv6 */
541 /* the domain mapping is empty so remove it from the mapping table */
542 netlbl_domhsh_remove_entry(entry_map, audit_info);
543
544remove_af4_single_addr:
545 rcu_read_unlock();
546 /* yick, we can't use call_rcu here because we don't have a rcu head
547 * pointer but hopefully this should be a rare case so the pause
548 * shouldn't be a problem */
549 synchronize_rcu();
550 entry = netlbl_domhsh_addr4_entry(entry_addr);
551 cipso_v4_doi_putdef(entry->type_def.cipsov4);
552 kfree(entry);
553 return 0;
554
555remove_af4_failure:
556 rcu_read_unlock();
557 return -ENOENT;
558}
559
560/**
Paul Moored15c3452006-08-03 16:48:37 -0700561 * netlbl_domhsh_remove - Removes an entry from the domain hash table
562 * @domain: the domain to remove
Paul Moore95d4e6b2006-09-29 17:05:05 -0700563 * @audit_info: NetLabel audit information
Paul Moored15c3452006-08-03 16:48:37 -0700564 *
565 * Description:
566 * Removes an entry from the domain hash table and handles any updates to the
567 * lower level protocol handler (i.e. CIPSO). Returns zero on success,
568 * negative on failure.
569 *
570 */
Paul Moore95d4e6b2006-09-29 17:05:05 -0700571int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info)
Paul Moored15c3452006-08-03 16:48:37 -0700572{
Paul Mooreb1edeb12008-10-10 10:16:31 -0400573 int ret_val;
Paul Moored15c3452006-08-03 16:48:37 -0700574 struct netlbl_dom_map *entry;
575
576 rcu_read_lock();
Paul Mooreb64397e2008-01-29 08:37:54 -0500577 if (domain)
578 entry = netlbl_domhsh_search(domain);
579 else
580 entry = netlbl_domhsh_search_def(domain);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400581 ret_val = netlbl_domhsh_remove_entry(entry, audit_info);
Paul Moored15c3452006-08-03 16:48:37 -0700582 rcu_read_unlock();
Paul Mooreb1edeb12008-10-10 10:16:31 -0400583
Paul Moored15c3452006-08-03 16:48:37 -0700584 return ret_val;
585}
586
587/**
588 * netlbl_domhsh_remove_default - Removes the default entry from the table
Paul Moore95d4e6b2006-09-29 17:05:05 -0700589 * @audit_info: NetLabel audit information
Paul Moored15c3452006-08-03 16:48:37 -0700590 *
591 * Description:
592 * Removes/resets the default entry for the domain hash table and handles any
593 * updates to the lower level protocol handler (i.e. CIPSO). Returns zero on
594 * success, non-zero on failure.
595 *
596 */
Paul Moore95d4e6b2006-09-29 17:05:05 -0700597int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info)
Paul Moored15c3452006-08-03 16:48:37 -0700598{
Paul Moore95d4e6b2006-09-29 17:05:05 -0700599 return netlbl_domhsh_remove(NULL, audit_info);
Paul Moored15c3452006-08-03 16:48:37 -0700600}
601
602/**
603 * netlbl_domhsh_getentry - Get an entry from the domain hash table
604 * @domain: the domain name to search for
605 *
606 * Description:
607 * Look through the domain hash table searching for an entry to match @domain,
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300608 * return a pointer to a copy of the entry or NULL. The caller is responsible
Paul Moored15c3452006-08-03 16:48:37 -0700609 * for ensuring that rcu_read_[un]lock() is called.
610 *
611 */
612struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain)
613{
Paul Mooreb64397e2008-01-29 08:37:54 -0500614 return netlbl_domhsh_search_def(domain);
Paul Moored15c3452006-08-03 16:48:37 -0700615}
616
617/**
Paul Moore63c41682008-10-10 10:16:32 -0400618 * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table
619 * @domain: the domain name to search for
620 * @addr: the IP address to search for
621 *
622 * Description:
623 * Look through the domain hash table searching for an entry to match @domain
624 * and @addr, return a pointer to a copy of the entry or NULL. The caller is
625 * responsible for ensuring that rcu_read_[un]lock() is called.
626 *
627 */
628struct netlbl_domaddr4_map *netlbl_domhsh_getentry_af4(const char *domain,
629 __be32 addr)
630{
631 struct netlbl_dom_map *dom_iter;
632 struct netlbl_af4list *addr_iter;
633
634 dom_iter = netlbl_domhsh_search_def(domain);
635 if (dom_iter == NULL)
636 return NULL;
637 if (dom_iter->type != NETLBL_NLTYPE_ADDRSELECT)
638 return NULL;
639
640 addr_iter = netlbl_af4list_search(addr,
641 &dom_iter->type_def.addrsel->list4);
642 if (addr_iter == NULL)
643 return NULL;
644
645 return netlbl_domhsh_addr4_entry(addr_iter);
646}
647
648#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
649/**
650 * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table
651 * @domain: the domain name to search for
652 * @addr: the IP address to search for
653 *
654 * Description:
655 * Look through the domain hash table searching for an entry to match @domain
656 * and @addr, return a pointer to a copy of the entry or NULL. The caller is
657 * responsible for ensuring that rcu_read_[un]lock() is called.
658 *
659 */
660struct netlbl_domaddr6_map *netlbl_domhsh_getentry_af6(const char *domain,
661 const struct in6_addr *addr)
662{
663 struct netlbl_dom_map *dom_iter;
664 struct netlbl_af6list *addr_iter;
665
666 dom_iter = netlbl_domhsh_search_def(domain);
667 if (dom_iter == NULL)
668 return NULL;
669 if (dom_iter->type != NETLBL_NLTYPE_ADDRSELECT)
670 return NULL;
671
672 addr_iter = netlbl_af6list_search(addr,
673 &dom_iter->type_def.addrsel->list6);
674 if (addr_iter == NULL)
675 return NULL;
676
677 return netlbl_domhsh_addr6_entry(addr_iter);
678}
679#endif /* IPv6 */
680
681/**
Paul Moorefcd48282006-09-25 15:56:09 -0700682 * netlbl_domhsh_walk - Iterate through the domain mapping hash table
683 * @skip_bkt: the number of buckets to skip at the start
684 * @skip_chain: the number of entries to skip in the first iterated bucket
685 * @callback: callback for each entry
686 * @cb_arg: argument for the callback function
Paul Moored15c3452006-08-03 16:48:37 -0700687 *
688 * Description:
Paul Moorefcd48282006-09-25 15:56:09 -0700689 * Interate over the domain mapping hash table, skipping the first @skip_bkt
690 * buckets and @skip_chain entries. For each entry in the table call
691 * @callback, if @callback returns a negative value stop 'walking' through the
692 * table and return. Updates the values in @skip_bkt and @skip_chain on
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200693 * return. Returns zero on success, negative values on failure.
Paul Moored15c3452006-08-03 16:48:37 -0700694 *
695 */
Paul Moorefcd48282006-09-25 15:56:09 -0700696int netlbl_domhsh_walk(u32 *skip_bkt,
697 u32 *skip_chain,
698 int (*callback) (struct netlbl_dom_map *entry, void *arg),
699 void *cb_arg)
Paul Moored15c3452006-08-03 16:48:37 -0700700{
Paul Moorefcd48282006-09-25 15:56:09 -0700701 int ret_val = -ENOENT;
702 u32 iter_bkt;
Paul Moore56196702008-10-10 10:16:29 -0400703 struct list_head *iter_list;
Paul Moorefcd48282006-09-25 15:56:09 -0700704 struct netlbl_dom_map *iter_entry;
705 u32 chain_cnt = 0;
Paul Moored15c3452006-08-03 16:48:37 -0700706
Paul Moored15c3452006-08-03 16:48:37 -0700707 rcu_read_lock();
Paul Moorefcd48282006-09-25 15:56:09 -0700708 for (iter_bkt = *skip_bkt;
709 iter_bkt < rcu_dereference(netlbl_domhsh)->size;
710 iter_bkt++, chain_cnt = 0) {
Paul Moore56196702008-10-10 10:16:29 -0400711 iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt];
712 list_for_each_entry_rcu(iter_entry, iter_list, list)
Paul Moorefcd48282006-09-25 15:56:09 -0700713 if (iter_entry->valid) {
714 if (chain_cnt++ < *skip_chain)
715 continue;
716 ret_val = callback(iter_entry, cb_arg);
717 if (ret_val < 0) {
718 chain_cnt--;
719 goto walk_return;
720 }
Paul Moored15c3452006-08-03 16:48:37 -0700721 }
Paul Moorefcd48282006-09-25 15:56:09 -0700722 }
Paul Moored15c3452006-08-03 16:48:37 -0700723
Paul Moorefcd48282006-09-25 15:56:09 -0700724walk_return:
Paul Moored15c3452006-08-03 16:48:37 -0700725 rcu_read_unlock();
Paul Moorefcd48282006-09-25 15:56:09 -0700726 *skip_bkt = iter_bkt;
727 *skip_chain = chain_cnt;
728 return ret_val;
Paul Moored15c3452006-08-03 16:48:37 -0700729}