2 * NetLabel Domain Hash Table
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
9 * Author: Paul Moore <paul@paul-moore.com>
14 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
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.
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.
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
32 #include <linux/types.h>
33 #include <linux/rculist.h>
34 #include <linux/skbuff.h>
35 #include <linux/spinlock.h>
36 #include <linux/string.h>
37 #include <linux/audit.h>
38 #include <linux/slab.h>
39 #include <net/netlabel.h>
40 #include <net/cipso_ipv4.h>
43 #include "netlabel_mgmt.h"
44 #include "netlabel_addrlist.h"
45 #include "netlabel_domainhash.h"
46 #include "netlabel_user.h"
48 struct netlbl_domhsh_tbl
{
49 struct list_head
*tbl
;
53 /* Domain hash table */
54 /* updates should be so rare that having one spinlock for the entire hash table
56 static DEFINE_SPINLOCK(netlbl_domhsh_lock
);
57 #define netlbl_domhsh_rcu_deref(p) \
58 rcu_dereference_check(p, lockdep_is_held(&netlbl_domhsh_lock))
59 static struct netlbl_domhsh_tbl
*netlbl_domhsh
= NULL
;
60 static struct netlbl_dom_map
*netlbl_domhsh_def
= NULL
;
63 * Domain Hash Table Helper Functions
67 * netlbl_domhsh_free_entry - Frees a domain hash table entry
68 * @entry: the entry's RCU field
71 * This function is designed to be used as a callback to the call_rcu()
72 * function so that the memory allocated to a hash table entry can be released
76 static void netlbl_domhsh_free_entry(struct rcu_head
*entry
)
78 struct netlbl_dom_map
*ptr
;
79 struct netlbl_af4list
*iter4
;
80 struct netlbl_af4list
*tmp4
;
81 #if IS_ENABLED(CONFIG_IPV6)
82 struct netlbl_af6list
*iter6
;
83 struct netlbl_af6list
*tmp6
;
86 ptr
= container_of(entry
, struct netlbl_dom_map
, rcu
);
87 if (ptr
->def
.type
== NETLBL_NLTYPE_ADDRSELECT
) {
88 netlbl_af4list_foreach_safe(iter4
, tmp4
,
89 &ptr
->def
.addrsel
->list4
) {
90 netlbl_af4list_remove_entry(iter4
);
91 kfree(netlbl_domhsh_addr4_entry(iter4
));
93 #if IS_ENABLED(CONFIG_IPV6)
94 netlbl_af6list_foreach_safe(iter6
, tmp6
,
95 &ptr
->def
.addrsel
->list6
) {
96 netlbl_af6list_remove_entry(iter6
);
97 kfree(netlbl_domhsh_addr6_entry(iter6
));
106 * netlbl_domhsh_hash - Hashing function for the domain hash table
107 * @domain: the domain name to hash
110 * This is the hashing function for the domain hash table, it returns the
111 * correct bucket number for the domain. The caller is responsible for
112 * ensuring that the hash table is protected with either a RCU read lock or the
116 static u32
netlbl_domhsh_hash(const char *key
)
122 /* This is taken (with slight modification) from
123 * security/selinux/ss/symtab.c:symhash() */
125 for (iter
= 0, val
= 0, len
= strlen(key
); iter
< len
; iter
++)
126 val
= (val
<< 4 | (val
>> (8 * sizeof(u32
) - 4))) ^ key
[iter
];
127 return val
& (netlbl_domhsh_rcu_deref(netlbl_domhsh
)->size
- 1);
131 * netlbl_domhsh_search - Search for a domain entry
132 * @domain: the domain
135 * Searches the domain hash table and returns a pointer to the hash table
136 * entry if found, otherwise NULL is returned. The caller is responsible for
137 * ensuring that the hash table is protected with either a RCU read lock or the
141 static struct netlbl_dom_map
*netlbl_domhsh_search(const char *domain
)
144 struct list_head
*bkt_list
;
145 struct netlbl_dom_map
*iter
;
147 if (domain
!= NULL
) {
148 bkt
= netlbl_domhsh_hash(domain
);
149 bkt_list
= &netlbl_domhsh_rcu_deref(netlbl_domhsh
)->tbl
[bkt
];
150 list_for_each_entry_rcu(iter
, bkt_list
, list
)
151 if (iter
->valid
&& strcmp(iter
->domain
, domain
) == 0)
159 * netlbl_domhsh_search_def - Search for a domain entry
160 * @domain: the domain
161 * @def: return default if no match is found
164 * Searches the domain hash table and returns a pointer to the hash table
165 * entry if an exact match is found, if an exact match is not present in the
166 * hash table then the default entry is returned if valid otherwise NULL is
167 * returned. The caller is responsible ensuring that the hash table is
168 * protected with either a RCU read lock or the hash table lock.
171 static struct netlbl_dom_map
*netlbl_domhsh_search_def(const char *domain
)
173 struct netlbl_dom_map
*entry
;
175 entry
= netlbl_domhsh_search(domain
);
177 entry
= netlbl_domhsh_rcu_deref(netlbl_domhsh_def
);
178 if (entry
!= NULL
&& !entry
->valid
)
186 * netlbl_domhsh_audit_add - Generate an audit entry for an add event
187 * @entry: the entry being added
188 * @addr4: the IPv4 address information
189 * @addr6: the IPv6 address information
190 * @result: the result code
191 * @audit_info: NetLabel audit information
194 * Generate an audit record for adding a new NetLabel/LSM mapping entry with
195 * the given information. Caller is responsible for holding the necessary
199 static void netlbl_domhsh_audit_add(struct netlbl_dom_map
*entry
,
200 struct netlbl_af4list
*addr4
,
201 struct netlbl_af6list
*addr6
,
203 struct netlbl_audit
*audit_info
)
205 struct audit_buffer
*audit_buf
;
206 struct cipso_v4_doi
*cipsov4
= NULL
;
209 audit_buf
= netlbl_audit_start_common(AUDIT_MAC_MAP_ADD
, audit_info
);
210 if (audit_buf
!= NULL
) {
211 audit_log_format(audit_buf
, " nlbl_domain=%s",
212 entry
->domain
? entry
->domain
: "(default)");
214 struct netlbl_domaddr4_map
*map4
;
215 map4
= netlbl_domhsh_addr4_entry(addr4
);
216 type
= map4
->def
.type
;
217 cipsov4
= map4
->def
.cipso
;
218 netlbl_af4list_audit_addr(audit_buf
, 0, NULL
,
219 addr4
->addr
, addr4
->mask
);
220 #if IS_ENABLED(CONFIG_IPV6)
221 } else if (addr6
!= NULL
) {
222 struct netlbl_domaddr6_map
*map6
;
223 map6
= netlbl_domhsh_addr6_entry(addr6
);
224 type
= map6
->def
.type
;
225 netlbl_af6list_audit_addr(audit_buf
, 0, NULL
,
226 &addr6
->addr
, &addr6
->mask
);
229 type
= entry
->def
.type
;
230 cipsov4
= entry
->def
.cipso
;
233 case NETLBL_NLTYPE_UNLABELED
:
234 audit_log_format(audit_buf
, " nlbl_protocol=unlbl");
236 case NETLBL_NLTYPE_CIPSOV4
:
237 BUG_ON(cipsov4
== NULL
);
238 audit_log_format(audit_buf
,
239 " nlbl_protocol=cipsov4 cipso_doi=%u",
243 audit_log_format(audit_buf
, " res=%u", result
== 0 ? 1 : 0);
244 audit_log_end(audit_buf
);
249 * netlbl_domhsh_validate - Validate a new domain mapping entry
250 * @entry: the entry to validate
252 * This function validates the new domain mapping entry to ensure that it is
253 * a valid entry. Returns zero on success, negative values on failure.
256 static int netlbl_domhsh_validate(const struct netlbl_dom_map
*entry
)
258 struct netlbl_af4list
*iter4
;
259 struct netlbl_domaddr4_map
*map4
;
260 #if IS_ENABLED(CONFIG_IPV6)
261 struct netlbl_af6list
*iter6
;
262 struct netlbl_domaddr6_map
*map6
;
268 switch (entry
->def
.type
) {
269 case NETLBL_NLTYPE_UNLABELED
:
270 if (entry
->def
.cipso
!= NULL
|| entry
->def
.addrsel
!= NULL
)
273 case NETLBL_NLTYPE_CIPSOV4
:
274 if (entry
->def
.cipso
== NULL
)
277 case NETLBL_NLTYPE_ADDRSELECT
:
278 netlbl_af4list_foreach(iter4
, &entry
->def
.addrsel
->list4
) {
279 map4
= netlbl_domhsh_addr4_entry(iter4
);
280 switch (map4
->def
.type
) {
281 case NETLBL_NLTYPE_UNLABELED
:
282 if (map4
->def
.cipso
!= NULL
)
285 case NETLBL_NLTYPE_CIPSOV4
:
286 if (map4
->def
.cipso
== NULL
)
293 #if IS_ENABLED(CONFIG_IPV6)
294 netlbl_af6list_foreach(iter6
, &entry
->def
.addrsel
->list6
) {
295 map6
= netlbl_domhsh_addr6_entry(iter6
);
296 switch (map6
->def
.type
) {
297 case NETLBL_NLTYPE_UNLABELED
:
313 * Domain Hash Table Functions
317 * netlbl_domhsh_init - Init for the domain hash
318 * @size: the number of bits to use for the hash buckets
321 * Initializes the domain hash table, should be called only by
322 * netlbl_user_init() during initialization. Returns zero on success, non-zero
326 int __init
netlbl_domhsh_init(u32 size
)
329 struct netlbl_domhsh_tbl
*hsh_tbl
;
334 hsh_tbl
= kmalloc(sizeof(*hsh_tbl
), GFP_KERNEL
);
337 hsh_tbl
->size
= 1 << size
;
338 hsh_tbl
->tbl
= kcalloc(hsh_tbl
->size
,
339 sizeof(struct list_head
),
341 if (hsh_tbl
->tbl
== NULL
) {
345 for (iter
= 0; iter
< hsh_tbl
->size
; iter
++)
346 INIT_LIST_HEAD(&hsh_tbl
->tbl
[iter
]);
348 spin_lock(&netlbl_domhsh_lock
);
349 rcu_assign_pointer(netlbl_domhsh
, hsh_tbl
);
350 spin_unlock(&netlbl_domhsh_lock
);
356 * netlbl_domhsh_add - Adds a entry to the domain hash table
357 * @entry: the entry to add
358 * @audit_info: NetLabel audit information
361 * Adds a new entry to the domain hash table and handles any updates to the
362 * lower level protocol handler (i.e. CIPSO). Returns zero on success,
363 * negative on failure.
366 int netlbl_domhsh_add(struct netlbl_dom_map
*entry
,
367 struct netlbl_audit
*audit_info
)
370 struct netlbl_dom_map
*entry_old
;
371 struct netlbl_af4list
*iter4
;
372 struct netlbl_af4list
*tmp4
;
373 #if IS_ENABLED(CONFIG_IPV6)
374 struct netlbl_af6list
*iter6
;
375 struct netlbl_af6list
*tmp6
;
378 ret_val
= netlbl_domhsh_validate(entry
);
382 /* XXX - we can remove this RCU read lock as the spinlock protects the
383 * entire function, but before we do we need to fixup the
384 * netlbl_af[4,6]list RCU functions to do "the right thing" with
385 * respect to rcu_dereference() when only a spinlock is held. */
387 spin_lock(&netlbl_domhsh_lock
);
388 if (entry
->domain
!= NULL
)
389 entry_old
= netlbl_domhsh_search(entry
->domain
);
391 entry_old
= netlbl_domhsh_search_def(entry
->domain
);
392 if (entry_old
== NULL
) {
395 if (entry
->domain
!= NULL
) {
396 u32 bkt
= netlbl_domhsh_hash(entry
->domain
);
397 list_add_tail_rcu(&entry
->list
,
398 &rcu_dereference(netlbl_domhsh
)->tbl
[bkt
]);
400 INIT_LIST_HEAD(&entry
->list
);
401 rcu_assign_pointer(netlbl_domhsh_def
, entry
);
404 if (entry
->def
.type
== NETLBL_NLTYPE_ADDRSELECT
) {
405 netlbl_af4list_foreach_rcu(iter4
,
406 &entry
->def
.addrsel
->list4
)
407 netlbl_domhsh_audit_add(entry
, iter4
, NULL
,
408 ret_val
, audit_info
);
409 #if IS_ENABLED(CONFIG_IPV6)
410 netlbl_af6list_foreach_rcu(iter6
,
411 &entry
->def
.addrsel
->list6
)
412 netlbl_domhsh_audit_add(entry
, NULL
, iter6
,
413 ret_val
, audit_info
);
416 netlbl_domhsh_audit_add(entry
, NULL
, NULL
,
417 ret_val
, audit_info
);
418 } else if (entry_old
->def
.type
== NETLBL_NLTYPE_ADDRSELECT
&&
419 entry
->def
.type
== NETLBL_NLTYPE_ADDRSELECT
) {
420 struct list_head
*old_list4
;
421 struct list_head
*old_list6
;
423 old_list4
= &entry_old
->def
.addrsel
->list4
;
424 old_list6
= &entry_old
->def
.addrsel
->list6
;
426 /* we only allow the addition of address selectors if all of
427 * the selectors do not exist in the existing domain map */
428 netlbl_af4list_foreach_rcu(iter4
, &entry
->def
.addrsel
->list4
)
429 if (netlbl_af4list_search_exact(iter4
->addr
,
435 #if IS_ENABLED(CONFIG_IPV6)
436 netlbl_af6list_foreach_rcu(iter6
, &entry
->def
.addrsel
->list6
)
437 if (netlbl_af6list_search_exact(&iter6
->addr
,
445 netlbl_af4list_foreach_safe(iter4
, tmp4
,
446 &entry
->def
.addrsel
->list4
) {
447 netlbl_af4list_remove_entry(iter4
);
449 ret_val
= netlbl_af4list_add(iter4
, old_list4
);
450 netlbl_domhsh_audit_add(entry_old
, iter4
, NULL
,
451 ret_val
, audit_info
);
455 #if IS_ENABLED(CONFIG_IPV6)
456 netlbl_af6list_foreach_safe(iter6
, tmp6
,
457 &entry
->def
.addrsel
->list6
) {
458 netlbl_af6list_remove_entry(iter6
);
460 ret_val
= netlbl_af6list_add(iter6
, old_list6
);
461 netlbl_domhsh_audit_add(entry_old
, NULL
, iter6
,
462 ret_val
, audit_info
);
471 spin_unlock(&netlbl_domhsh_lock
);
477 * netlbl_domhsh_add_default - Adds the default entry to the domain hash table
478 * @entry: the entry to add
479 * @audit_info: NetLabel audit information
482 * Adds a new default entry to the domain hash table and handles any updates
483 * to the lower level protocol handler (i.e. CIPSO). Returns zero on success,
484 * negative on failure.
487 int netlbl_domhsh_add_default(struct netlbl_dom_map
*entry
,
488 struct netlbl_audit
*audit_info
)
490 return netlbl_domhsh_add(entry
, audit_info
);
494 * netlbl_domhsh_remove_entry - Removes a given entry from the domain table
495 * @entry: the entry to remove
496 * @audit_info: NetLabel audit information
499 * Removes an entry from the domain hash table and handles any updates to the
500 * lower level protocol handler (i.e. CIPSO). Caller is responsible for
501 * ensuring that the RCU read lock is held. Returns zero on success, negative
505 int netlbl_domhsh_remove_entry(struct netlbl_dom_map
*entry
,
506 struct netlbl_audit
*audit_info
)
509 struct audit_buffer
*audit_buf
;
514 spin_lock(&netlbl_domhsh_lock
);
517 if (entry
!= rcu_dereference(netlbl_domhsh_def
))
518 list_del_rcu(&entry
->list
);
520 RCU_INIT_POINTER(netlbl_domhsh_def
, NULL
);
523 spin_unlock(&netlbl_domhsh_lock
);
525 audit_buf
= netlbl_audit_start_common(AUDIT_MAC_MAP_DEL
, audit_info
);
526 if (audit_buf
!= NULL
) {
527 audit_log_format(audit_buf
,
528 " nlbl_domain=%s res=%u",
529 entry
->domain
? entry
->domain
: "(default)",
530 ret_val
== 0 ? 1 : 0);
531 audit_log_end(audit_buf
);
535 struct netlbl_af4list
*iter4
;
536 struct netlbl_domaddr4_map
*map4
;
538 switch (entry
->def
.type
) {
539 case NETLBL_NLTYPE_ADDRSELECT
:
540 netlbl_af4list_foreach_rcu(iter4
,
541 &entry
->def
.addrsel
->list4
) {
542 map4
= netlbl_domhsh_addr4_entry(iter4
);
543 cipso_v4_doi_putdef(map4
->def
.cipso
);
545 /* no need to check the IPv6 list since we currently
546 * support only unlabeled protocols for IPv6 */
548 case NETLBL_NLTYPE_CIPSOV4
:
549 cipso_v4_doi_putdef(entry
->def
.cipso
);
552 call_rcu(&entry
->rcu
, netlbl_domhsh_free_entry
);
559 * netlbl_domhsh_remove_af4 - Removes an address selector entry
560 * @domain: the domain
561 * @addr: IPv4 address
562 * @mask: IPv4 address mask
563 * @audit_info: NetLabel audit information
566 * Removes an individual address selector from a domain mapping and potentially
567 * the entire mapping if it is empty. Returns zero on success, negative values
571 int netlbl_domhsh_remove_af4(const char *domain
,
572 const struct in_addr
*addr
,
573 const struct in_addr
*mask
,
574 struct netlbl_audit
*audit_info
)
576 struct netlbl_dom_map
*entry_map
;
577 struct netlbl_af4list
*entry_addr
;
578 struct netlbl_af4list
*iter4
;
579 #if IS_ENABLED(CONFIG_IPV6)
580 struct netlbl_af6list
*iter6
;
582 struct netlbl_domaddr4_map
*entry
;
587 entry_map
= netlbl_domhsh_search(domain
);
589 entry_map
= netlbl_domhsh_search_def(domain
);
590 if (entry_map
== NULL
||
591 entry_map
->def
.type
!= NETLBL_NLTYPE_ADDRSELECT
)
592 goto remove_af4_failure
;
594 spin_lock(&netlbl_domhsh_lock
);
595 entry_addr
= netlbl_af4list_remove(addr
->s_addr
, mask
->s_addr
,
596 &entry_map
->def
.addrsel
->list4
);
597 spin_unlock(&netlbl_domhsh_lock
);
599 if (entry_addr
== NULL
)
600 goto remove_af4_failure
;
601 netlbl_af4list_foreach_rcu(iter4
, &entry_map
->def
.addrsel
->list4
)
602 goto remove_af4_single_addr
;
603 #if IS_ENABLED(CONFIG_IPV6)
604 netlbl_af6list_foreach_rcu(iter6
, &entry_map
->def
.addrsel
->list6
)
605 goto remove_af4_single_addr
;
607 /* the domain mapping is empty so remove it from the mapping table */
608 netlbl_domhsh_remove_entry(entry_map
, audit_info
);
610 remove_af4_single_addr
:
612 /* yick, we can't use call_rcu here because we don't have a rcu head
613 * pointer but hopefully this should be a rare case so the pause
614 * shouldn't be a problem */
616 entry
= netlbl_domhsh_addr4_entry(entry_addr
);
617 cipso_v4_doi_putdef(entry
->def
.cipso
);
627 * netlbl_domhsh_remove - Removes an entry from the domain hash table
628 * @domain: the domain to remove
629 * @audit_info: NetLabel audit information
632 * Removes an entry from the domain hash table and handles any updates to the
633 * lower level protocol handler (i.e. CIPSO). Returns zero on success,
634 * negative on failure.
637 int netlbl_domhsh_remove(const char *domain
, struct netlbl_audit
*audit_info
)
640 struct netlbl_dom_map
*entry
;
644 entry
= netlbl_domhsh_search(domain
);
646 entry
= netlbl_domhsh_search_def(domain
);
647 ret_val
= netlbl_domhsh_remove_entry(entry
, audit_info
);
654 * netlbl_domhsh_remove_default - Removes the default entry from the table
655 * @audit_info: NetLabel audit information
658 * Removes/resets the default entry for the domain hash table and handles any
659 * updates to the lower level protocol handler (i.e. CIPSO). Returns zero on
660 * success, non-zero on failure.
663 int netlbl_domhsh_remove_default(struct netlbl_audit
*audit_info
)
665 return netlbl_domhsh_remove(NULL
, audit_info
);
669 * netlbl_domhsh_getentry - Get an entry from the domain hash table
670 * @domain: the domain name to search for
673 * Look through the domain hash table searching for an entry to match @domain,
674 * return a pointer to a copy of the entry or NULL. The caller is responsible
675 * for ensuring that rcu_read_[un]lock() is called.
678 struct netlbl_dom_map
*netlbl_domhsh_getentry(const char *domain
)
680 return netlbl_domhsh_search_def(domain
);
684 * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table
685 * @domain: the domain name to search for
686 * @addr: the IP address to search for
689 * Look through the domain hash table searching for an entry to match @domain
690 * and @addr, return a pointer to a copy of the entry or NULL. The caller is
691 * responsible for ensuring that rcu_read_[un]lock() is called.
694 struct netlbl_dommap_def
*netlbl_domhsh_getentry_af4(const char *domain
,
697 struct netlbl_dom_map
*dom_iter
;
698 struct netlbl_af4list
*addr_iter
;
700 dom_iter
= netlbl_domhsh_search_def(domain
);
701 if (dom_iter
== NULL
)
704 if (dom_iter
->def
.type
!= NETLBL_NLTYPE_ADDRSELECT
)
705 return &dom_iter
->def
;
706 addr_iter
= netlbl_af4list_search(addr
, &dom_iter
->def
.addrsel
->list4
);
707 if (addr_iter
== NULL
)
709 return &(netlbl_domhsh_addr4_entry(addr_iter
)->def
);
712 #if IS_ENABLED(CONFIG_IPV6)
714 * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table
715 * @domain: the domain name to search for
716 * @addr: the IP address to search for
719 * Look through the domain hash table searching for an entry to match @domain
720 * and @addr, return a pointer to a copy of the entry or NULL. The caller is
721 * responsible for ensuring that rcu_read_[un]lock() is called.
724 struct netlbl_dommap_def
*netlbl_domhsh_getentry_af6(const char *domain
,
725 const struct in6_addr
*addr
)
727 struct netlbl_dom_map
*dom_iter
;
728 struct netlbl_af6list
*addr_iter
;
730 dom_iter
= netlbl_domhsh_search_def(domain
);
731 if (dom_iter
== NULL
)
734 if (dom_iter
->def
.type
!= NETLBL_NLTYPE_ADDRSELECT
)
735 return &dom_iter
->def
;
736 addr_iter
= netlbl_af6list_search(addr
, &dom_iter
->def
.addrsel
->list6
);
737 if (addr_iter
== NULL
)
739 return &(netlbl_domhsh_addr6_entry(addr_iter
)->def
);
744 * netlbl_domhsh_walk - Iterate through the domain mapping hash table
745 * @skip_bkt: the number of buckets to skip at the start
746 * @skip_chain: the number of entries to skip in the first iterated bucket
747 * @callback: callback for each entry
748 * @cb_arg: argument for the callback function
751 * Interate over the domain mapping hash table, skipping the first @skip_bkt
752 * buckets and @skip_chain entries. For each entry in the table call
753 * @callback, if @callback returns a negative value stop 'walking' through the
754 * table and return. Updates the values in @skip_bkt and @skip_chain on
755 * return. Returns zero on success, negative values on failure.
758 int netlbl_domhsh_walk(u32
*skip_bkt
,
760 int (*callback
) (struct netlbl_dom_map
*entry
, void *arg
),
763 int ret_val
= -ENOENT
;
765 struct list_head
*iter_list
;
766 struct netlbl_dom_map
*iter_entry
;
770 for (iter_bkt
= *skip_bkt
;
771 iter_bkt
< rcu_dereference(netlbl_domhsh
)->size
;
772 iter_bkt
++, chain_cnt
= 0) {
773 iter_list
= &rcu_dereference(netlbl_domhsh
)->tbl
[iter_bkt
];
774 list_for_each_entry_rcu(iter_entry
, iter_list
, list
)
775 if (iter_entry
->valid
) {
776 if (chain_cnt
++ < *skip_chain
)
778 ret_val
= callback(iter_entry
, cb_arg
);
788 *skip_bkt
= iter_bkt
;
789 *skip_chain
= chain_cnt
;