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
->type
== NETLBL_NLTYPE_ADDRSELECT
) {
88 netlbl_af4list_foreach_safe(iter4
, tmp4
,
89 &ptr
->type_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
->type_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
);
217 cipsov4
= map4
->type_def
.cipsov4
;
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
);
225 netlbl_af6list_audit_addr(audit_buf
, 0, NULL
,
226 &addr6
->addr
, &addr6
->mask
);
230 cipsov4
= entry
->type_def
.cipsov4
;
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
->type
) {
269 case NETLBL_NLTYPE_UNLABELED
:
270 if (entry
->type_def
.cipsov4
!= NULL
||
271 entry
->type_def
.addrsel
!= NULL
)
274 case NETLBL_NLTYPE_CIPSOV4
:
275 if (entry
->type_def
.cipsov4
== NULL
)
278 case NETLBL_NLTYPE_ADDRSELECT
:
279 netlbl_af4list_foreach(iter4
, &entry
->type_def
.addrsel
->list4
) {
280 map4
= netlbl_domhsh_addr4_entry(iter4
);
281 switch (map4
->type
) {
282 case NETLBL_NLTYPE_UNLABELED
:
283 if (map4
->type_def
.cipsov4
!= NULL
)
286 case NETLBL_NLTYPE_CIPSOV4
:
287 if (map4
->type_def
.cipsov4
== NULL
)
294 #if IS_ENABLED(CONFIG_IPV6)
295 netlbl_af6list_foreach(iter6
, &entry
->type_def
.addrsel
->list6
) {
296 map6
= netlbl_domhsh_addr6_entry(iter6
);
297 switch (map6
->type
) {
298 case NETLBL_NLTYPE_UNLABELED
:
314 * Domain Hash Table Functions
318 * netlbl_domhsh_init - Init for the domain hash
319 * @size: the number of bits to use for the hash buckets
322 * Initializes the domain hash table, should be called only by
323 * netlbl_user_init() during initialization. Returns zero on success, non-zero
327 int __init
netlbl_domhsh_init(u32 size
)
330 struct netlbl_domhsh_tbl
*hsh_tbl
;
335 hsh_tbl
= kmalloc(sizeof(*hsh_tbl
), GFP_KERNEL
);
338 hsh_tbl
->size
= 1 << size
;
339 hsh_tbl
->tbl
= kcalloc(hsh_tbl
->size
,
340 sizeof(struct list_head
),
342 if (hsh_tbl
->tbl
== NULL
) {
346 for (iter
= 0; iter
< hsh_tbl
->size
; iter
++)
347 INIT_LIST_HEAD(&hsh_tbl
->tbl
[iter
]);
349 spin_lock(&netlbl_domhsh_lock
);
350 rcu_assign_pointer(netlbl_domhsh
, hsh_tbl
);
351 spin_unlock(&netlbl_domhsh_lock
);
357 * netlbl_domhsh_add - Adds a entry to the domain hash table
358 * @entry: the entry to add
359 * @audit_info: NetLabel audit information
362 * Adds a new entry to the domain hash table and handles any updates to the
363 * lower level protocol handler (i.e. CIPSO). Returns zero on success,
364 * negative on failure.
367 int netlbl_domhsh_add(struct netlbl_dom_map
*entry
,
368 struct netlbl_audit
*audit_info
)
371 struct netlbl_dom_map
*entry_old
;
372 struct netlbl_af4list
*iter4
;
373 struct netlbl_af4list
*tmp4
;
374 #if IS_ENABLED(CONFIG_IPV6)
375 struct netlbl_af6list
*iter6
;
376 struct netlbl_af6list
*tmp6
;
379 ret_val
= netlbl_domhsh_validate(entry
);
383 /* XXX - we can remove this RCU read lock as the spinlock protects the
384 * entire function, but before we do we need to fixup the
385 * netlbl_af[4,6]list RCU functions to do "the right thing" with
386 * respect to rcu_dereference() when only a spinlock is held. */
388 spin_lock(&netlbl_domhsh_lock
);
389 if (entry
->domain
!= NULL
)
390 entry_old
= netlbl_domhsh_search(entry
->domain
);
392 entry_old
= netlbl_domhsh_search_def(entry
->domain
);
393 if (entry_old
== NULL
) {
396 if (entry
->domain
!= NULL
) {
397 u32 bkt
= netlbl_domhsh_hash(entry
->domain
);
398 list_add_tail_rcu(&entry
->list
,
399 &rcu_dereference(netlbl_domhsh
)->tbl
[bkt
]);
401 INIT_LIST_HEAD(&entry
->list
);
402 rcu_assign_pointer(netlbl_domhsh_def
, entry
);
405 if (entry
->type
== NETLBL_NLTYPE_ADDRSELECT
) {
406 netlbl_af4list_foreach_rcu(iter4
,
407 &entry
->type_def
.addrsel
->list4
)
408 netlbl_domhsh_audit_add(entry
, iter4
, NULL
,
409 ret_val
, audit_info
);
410 #if IS_ENABLED(CONFIG_IPV6)
411 netlbl_af6list_foreach_rcu(iter6
,
412 &entry
->type_def
.addrsel
->list6
)
413 netlbl_domhsh_audit_add(entry
, NULL
, iter6
,
414 ret_val
, audit_info
);
417 netlbl_domhsh_audit_add(entry
, NULL
, NULL
,
418 ret_val
, audit_info
);
419 } else if (entry_old
->type
== NETLBL_NLTYPE_ADDRSELECT
&&
420 entry
->type
== NETLBL_NLTYPE_ADDRSELECT
) {
421 struct list_head
*old_list4
;
422 struct list_head
*old_list6
;
424 old_list4
= &entry_old
->type_def
.addrsel
->list4
;
425 old_list6
= &entry_old
->type_def
.addrsel
->list6
;
427 /* we only allow the addition of address selectors if all of
428 * the selectors do not exist in the existing domain map */
429 netlbl_af4list_foreach_rcu(iter4
,
430 &entry
->type_def
.addrsel
->list4
)
431 if (netlbl_af4list_search_exact(iter4
->addr
,
437 #if IS_ENABLED(CONFIG_IPV6)
438 netlbl_af6list_foreach_rcu(iter6
,
439 &entry
->type_def
.addrsel
->list6
)
440 if (netlbl_af6list_search_exact(&iter6
->addr
,
448 netlbl_af4list_foreach_safe(iter4
, tmp4
,
449 &entry
->type_def
.addrsel
->list4
) {
450 netlbl_af4list_remove_entry(iter4
);
452 ret_val
= netlbl_af4list_add(iter4
, old_list4
);
453 netlbl_domhsh_audit_add(entry_old
, iter4
, NULL
,
454 ret_val
, audit_info
);
458 #if IS_ENABLED(CONFIG_IPV6)
459 netlbl_af6list_foreach_safe(iter6
, tmp6
,
460 &entry
->type_def
.addrsel
->list6
) {
461 netlbl_af6list_remove_entry(iter6
);
463 ret_val
= netlbl_af6list_add(iter6
, old_list6
);
464 netlbl_domhsh_audit_add(entry_old
, NULL
, iter6
,
465 ret_val
, audit_info
);
474 spin_unlock(&netlbl_domhsh_lock
);
480 * netlbl_domhsh_add_default - Adds the default entry to the domain hash table
481 * @entry: the entry to add
482 * @audit_info: NetLabel audit information
485 * Adds a new default entry to the domain hash table and handles any updates
486 * to the lower level protocol handler (i.e. CIPSO). Returns zero on success,
487 * negative on failure.
490 int netlbl_domhsh_add_default(struct netlbl_dom_map
*entry
,
491 struct netlbl_audit
*audit_info
)
493 return netlbl_domhsh_add(entry
, audit_info
);
497 * netlbl_domhsh_remove_entry - Removes a given entry from the domain table
498 * @entry: the entry to remove
499 * @audit_info: NetLabel audit information
502 * Removes an entry from the domain hash table and handles any updates to the
503 * lower level protocol handler (i.e. CIPSO). Caller is responsible for
504 * ensuring that the RCU read lock is held. Returns zero on success, negative
508 int netlbl_domhsh_remove_entry(struct netlbl_dom_map
*entry
,
509 struct netlbl_audit
*audit_info
)
512 struct audit_buffer
*audit_buf
;
517 spin_lock(&netlbl_domhsh_lock
);
520 if (entry
!= rcu_dereference(netlbl_domhsh_def
))
521 list_del_rcu(&entry
->list
);
523 RCU_INIT_POINTER(netlbl_domhsh_def
, NULL
);
526 spin_unlock(&netlbl_domhsh_lock
);
528 audit_buf
= netlbl_audit_start_common(AUDIT_MAC_MAP_DEL
, audit_info
);
529 if (audit_buf
!= NULL
) {
530 audit_log_format(audit_buf
,
531 " nlbl_domain=%s res=%u",
532 entry
->domain
? entry
->domain
: "(default)",
533 ret_val
== 0 ? 1 : 0);
534 audit_log_end(audit_buf
);
538 struct netlbl_af4list
*iter4
;
539 struct netlbl_domaddr4_map
*map4
;
541 switch (entry
->type
) {
542 case NETLBL_NLTYPE_ADDRSELECT
:
543 netlbl_af4list_foreach_rcu(iter4
,
544 &entry
->type_def
.addrsel
->list4
) {
545 map4
= netlbl_domhsh_addr4_entry(iter4
);
546 cipso_v4_doi_putdef(map4
->type_def
.cipsov4
);
548 /* no need to check the IPv6 list since we currently
549 * support only unlabeled protocols for IPv6 */
551 case NETLBL_NLTYPE_CIPSOV4
:
552 cipso_v4_doi_putdef(entry
->type_def
.cipsov4
);
555 call_rcu(&entry
->rcu
, netlbl_domhsh_free_entry
);
562 * netlbl_domhsh_remove_af4 - Removes an address selector entry
563 * @domain: the domain
564 * @addr: IPv4 address
565 * @mask: IPv4 address mask
566 * @audit_info: NetLabel audit information
569 * Removes an individual address selector from a domain mapping and potentially
570 * the entire mapping if it is empty. Returns zero on success, negative values
574 int netlbl_domhsh_remove_af4(const char *domain
,
575 const struct in_addr
*addr
,
576 const struct in_addr
*mask
,
577 struct netlbl_audit
*audit_info
)
579 struct netlbl_dom_map
*entry_map
;
580 struct netlbl_af4list
*entry_addr
;
581 struct netlbl_af4list
*iter4
;
582 #if IS_ENABLED(CONFIG_IPV6)
583 struct netlbl_af6list
*iter6
;
585 struct netlbl_domaddr4_map
*entry
;
590 entry_map
= netlbl_domhsh_search(domain
);
592 entry_map
= netlbl_domhsh_search_def(domain
);
593 if (entry_map
== NULL
|| entry_map
->type
!= NETLBL_NLTYPE_ADDRSELECT
)
594 goto remove_af4_failure
;
596 spin_lock(&netlbl_domhsh_lock
);
597 entry_addr
= netlbl_af4list_remove(addr
->s_addr
, mask
->s_addr
,
598 &entry_map
->type_def
.addrsel
->list4
);
599 spin_unlock(&netlbl_domhsh_lock
);
601 if (entry_addr
== NULL
)
602 goto remove_af4_failure
;
603 netlbl_af4list_foreach_rcu(iter4
, &entry_map
->type_def
.addrsel
->list4
)
604 goto remove_af4_single_addr
;
605 #if IS_ENABLED(CONFIG_IPV6)
606 netlbl_af6list_foreach_rcu(iter6
, &entry_map
->type_def
.addrsel
->list6
)
607 goto remove_af4_single_addr
;
609 /* the domain mapping is empty so remove it from the mapping table */
610 netlbl_domhsh_remove_entry(entry_map
, audit_info
);
612 remove_af4_single_addr
:
614 /* yick, we can't use call_rcu here because we don't have a rcu head
615 * pointer but hopefully this should be a rare case so the pause
616 * shouldn't be a problem */
618 entry
= netlbl_domhsh_addr4_entry(entry_addr
);
619 cipso_v4_doi_putdef(entry
->type_def
.cipsov4
);
629 * netlbl_domhsh_remove - Removes an entry from the domain hash table
630 * @domain: the domain to remove
631 * @audit_info: NetLabel audit information
634 * Removes an entry from the domain hash table and handles any updates to the
635 * lower level protocol handler (i.e. CIPSO). Returns zero on success,
636 * negative on failure.
639 int netlbl_domhsh_remove(const char *domain
, struct netlbl_audit
*audit_info
)
642 struct netlbl_dom_map
*entry
;
646 entry
= netlbl_domhsh_search(domain
);
648 entry
= netlbl_domhsh_search_def(domain
);
649 ret_val
= netlbl_domhsh_remove_entry(entry
, audit_info
);
656 * netlbl_domhsh_remove_default - Removes the default entry from the table
657 * @audit_info: NetLabel audit information
660 * Removes/resets the default entry for the domain hash table and handles any
661 * updates to the lower level protocol handler (i.e. CIPSO). Returns zero on
662 * success, non-zero on failure.
665 int netlbl_domhsh_remove_default(struct netlbl_audit
*audit_info
)
667 return netlbl_domhsh_remove(NULL
, audit_info
);
671 * netlbl_domhsh_getentry - Get an entry from the domain hash table
672 * @domain: the domain name to search for
675 * Look through the domain hash table searching for an entry to match @domain,
676 * return a pointer to a copy of the entry or NULL. The caller is responsible
677 * for ensuring that rcu_read_[un]lock() is called.
680 struct netlbl_dom_map
*netlbl_domhsh_getentry(const char *domain
)
682 return netlbl_domhsh_search_def(domain
);
686 * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table
687 * @domain: the domain name to search for
688 * @addr: the IP address to search for
691 * Look through the domain hash table searching for an entry to match @domain
692 * and @addr, return a pointer to a copy of the entry or NULL. The caller is
693 * responsible for ensuring that rcu_read_[un]lock() is called.
696 struct netlbl_domaddr4_map
*netlbl_domhsh_getentry_af4(const char *domain
,
699 struct netlbl_dom_map
*dom_iter
;
700 struct netlbl_af4list
*addr_iter
;
702 dom_iter
= netlbl_domhsh_search_def(domain
);
703 if (dom_iter
== NULL
)
705 if (dom_iter
->type
!= NETLBL_NLTYPE_ADDRSELECT
)
708 addr_iter
= netlbl_af4list_search(addr
,
709 &dom_iter
->type_def
.addrsel
->list4
);
710 if (addr_iter
== NULL
)
713 return netlbl_domhsh_addr4_entry(addr_iter
);
716 #if IS_ENABLED(CONFIG_IPV6)
718 * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table
719 * @domain: the domain name to search for
720 * @addr: the IP address to search for
723 * Look through the domain hash table searching for an entry to match @domain
724 * and @addr, return a pointer to a copy of the entry or NULL. The caller is
725 * responsible for ensuring that rcu_read_[un]lock() is called.
728 struct netlbl_domaddr6_map
*netlbl_domhsh_getentry_af6(const char *domain
,
729 const struct in6_addr
*addr
)
731 struct netlbl_dom_map
*dom_iter
;
732 struct netlbl_af6list
*addr_iter
;
734 dom_iter
= netlbl_domhsh_search_def(domain
);
735 if (dom_iter
== NULL
)
737 if (dom_iter
->type
!= NETLBL_NLTYPE_ADDRSELECT
)
740 addr_iter
= netlbl_af6list_search(addr
,
741 &dom_iter
->type_def
.addrsel
->list6
);
742 if (addr_iter
== NULL
)
745 return netlbl_domhsh_addr6_entry(addr_iter
);
750 * netlbl_domhsh_walk - Iterate through the domain mapping hash table
751 * @skip_bkt: the number of buckets to skip at the start
752 * @skip_chain: the number of entries to skip in the first iterated bucket
753 * @callback: callback for each entry
754 * @cb_arg: argument for the callback function
757 * Interate over the domain mapping hash table, skipping the first @skip_bkt
758 * buckets and @skip_chain entries. For each entry in the table call
759 * @callback, if @callback returns a negative value stop 'walking' through the
760 * table and return. Updates the values in @skip_bkt and @skip_chain on
761 * return. Returns zero on success, negative values on failure.
764 int netlbl_domhsh_walk(u32
*skip_bkt
,
766 int (*callback
) (struct netlbl_dom_map
*entry
, void *arg
),
769 int ret_val
= -ENOENT
;
771 struct list_head
*iter_list
;
772 struct netlbl_dom_map
*iter_entry
;
776 for (iter_bkt
= *skip_bkt
;
777 iter_bkt
< rcu_dereference(netlbl_domhsh
)->size
;
778 iter_bkt
++, chain_cnt
= 0) {
779 iter_list
= &rcu_dereference(netlbl_domhsh
)->tbl
[iter_bkt
];
780 list_for_each_entry_rcu(iter_entry
, iter_list
, list
)
781 if (iter_entry
->valid
) {
782 if (chain_cnt
++ < *skip_chain
)
784 ret_val
= callback(iter_entry
, cb_arg
);
794 *skip_bkt
= iter_bkt
;
795 *skip_chain
= chain_cnt
;