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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NetLabel CALIPSO/IPv6 Support
4 *
5 * This file defines the CALIPSO/IPv6 functions for the NetLabel system. The
6 * NetLabel system manages static and dynamic label mappings for network
7 * protocols such as CIPSO and CALIPSO.
8 *
9 * Authors: Paul Moore <paul@paul-moore.com>
10 * Huw Davies <huw@codeweavers.com>
11 */
12
13/* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
14 * (c) Copyright Huw Davies <huw@codeweavers.com>, 2015
15 */
16
17#include <linux/types.h>
18#include <linux/socket.h>
19#include <linux/string.h>
20#include <linux/skbuff.h>
21#include <linux/audit.h>
22#include <linux/slab.h>
23#include <net/sock.h>
24#include <net/netlink.h>
25#include <net/genetlink.h>
26#include <net/netlabel.h>
27#include <net/calipso.h>
28#include <linux/atomic.h>
29
30#include "netlabel_user.h"
31#include "netlabel_calipso.h"
32#include "netlabel_mgmt.h"
33#include "netlabel_domainhash.h"
34
35/* Argument struct for calipso_doi_walk() */
36struct netlbl_calipso_doiwalk_arg {
37 struct netlink_callback *nl_cb;
38 struct sk_buff *skb;
39 u32 seq;
40};
41
42/* Argument struct for netlbl_domhsh_walk() */
43struct netlbl_domhsh_walk_arg {
44 struct netlbl_audit *audit_info;
45 u32 doi;
46};
47
48/* NetLabel Generic NETLINK CALIPSO family */
49static struct genl_family netlbl_calipso_gnl_family;
50
51/* NetLabel Netlink attribute policy */
52static const struct nla_policy calipso_genl_policy[NLBL_CALIPSO_A_MAX + 1] = {
53 [NLBL_CALIPSO_A_DOI] = { .type = NLA_U32 },
54 [NLBL_CALIPSO_A_MTYPE] = { .type = NLA_U32 },
55};
56
57static const struct netlbl_calipso_ops *calipso_ops;
58
59/**
60 * netlbl_calipso_ops_register - Register the CALIPSO operations
61 * @ops: ops to register
62 *
63 * Description:
64 * Register the CALIPSO packet engine operations.
65 *
66 */
67const struct netlbl_calipso_ops *
68netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops)
69{
70 return xchg(&calipso_ops, ops);
71}
72EXPORT_SYMBOL(netlbl_calipso_ops_register);
73
74static const struct netlbl_calipso_ops *netlbl_calipso_ops_get(void)
75{
76 return READ_ONCE(calipso_ops);
77}
78
79/* NetLabel Command Handlers
80 */
81/**
82 * netlbl_calipso_add_pass - Adds a CALIPSO pass DOI definition
83 * @info: the Generic NETLINK info block
84 * @audit_info: NetLabel audit information
85 *
86 * Description:
87 * Create a new CALIPSO_MAP_PASS DOI definition based on the given ADD message
88 * and add it to the CALIPSO engine. Return zero on success and non-zero on
89 * error.
90 *
91 */
92static int netlbl_calipso_add_pass(struct genl_info *info,
93 struct netlbl_audit *audit_info)
94{
95 int ret_val;
96 struct calipso_doi *doi_def = NULL;
97
98 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
99 if (!doi_def)
100 return -ENOMEM;
101 doi_def->type = CALIPSO_MAP_PASS;
102 doi_def->doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
103 ret_val = calipso_doi_add(doi_def, audit_info);
104 if (ret_val != 0)
105 calipso_doi_free(doi_def);
106
107 return ret_val;
108}
109
110/**
111 * netlbl_calipso_add - Handle an ADD message
112 * @skb: the NETLINK buffer
113 * @info: the Generic NETLINK info block
114 *
115 * Description:
116 * Create a new DOI definition based on the given ADD message and add it to the
117 * CALIPSO engine. Returns zero on success, negative values on failure.
118 *
119 */
120static int netlbl_calipso_add(struct sk_buff *skb, struct genl_info *info)
121{
122 int ret_val = -EINVAL;
123 struct netlbl_audit audit_info;
124 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
125
126 if (!info->attrs[NLBL_CALIPSO_A_DOI] ||
127 !info->attrs[NLBL_CALIPSO_A_MTYPE])
128 return -EINVAL;
129
130 if (!ops)
131 return -EOPNOTSUPP;
132
133 netlbl_netlink_auditinfo(&audit_info);
134 switch (nla_get_u32(info->attrs[NLBL_CALIPSO_A_MTYPE])) {
135 case CALIPSO_MAP_PASS:
136 ret_val = netlbl_calipso_add_pass(info, &audit_info);
137 break;
138 }
139 if (ret_val == 0)
140 atomic_inc(&netlabel_mgmt_protocount);
141
142 return ret_val;
143}
144
145/**
146 * netlbl_calipso_list - Handle a LIST message
147 * @skb: the NETLINK buffer
148 * @info: the Generic NETLINK info block
149 *
150 * Description:
151 * Process a user generated LIST message and respond accordingly.
152 * Returns zero on success and negative values on error.
153 *
154 */
155static int netlbl_calipso_list(struct sk_buff *skb, struct genl_info *info)
156{
157 int ret_val;
158 struct sk_buff *ans_skb = NULL;
159 void *data;
160 u32 doi;
161 struct calipso_doi *doi_def;
162
163 if (!info->attrs[NLBL_CALIPSO_A_DOI]) {
164 ret_val = -EINVAL;
165 goto list_failure;
166 }
167
168 doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
169
170 doi_def = calipso_doi_getdef(doi);
171 if (!doi_def) {
172 ret_val = -EINVAL;
173 goto list_failure;
174 }
175
176 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
177 if (!ans_skb) {
178 ret_val = -ENOMEM;
179 goto list_failure_put;
180 }
181 data = genlmsg_put_reply(ans_skb, info, &netlbl_calipso_gnl_family,
182 0, NLBL_CALIPSO_C_LIST);
183 if (!data) {
184 ret_val = -ENOMEM;
185 goto list_failure_put;
186 }
187
188 ret_val = nla_put_u32(ans_skb, NLBL_CALIPSO_A_MTYPE, doi_def->type);
189 if (ret_val != 0)
190 goto list_failure_put;
191
192 calipso_doi_putdef(doi_def);
193
194 genlmsg_end(ans_skb, data);
195 return genlmsg_reply(ans_skb, info);
196
197list_failure_put:
198 calipso_doi_putdef(doi_def);
199list_failure:
200 kfree_skb(ans_skb);
201 return ret_val;
202}
203
204/**
205 * netlbl_calipso_listall_cb - calipso_doi_walk() callback for LISTALL
206 * @doi_def: the CALIPSO DOI definition
207 * @arg: the netlbl_calipso_doiwalk_arg structure
208 *
209 * Description:
210 * This function is designed to be used as a callback to the
211 * calipso_doi_walk() function for use in generating a response for a LISTALL
212 * message. Returns the size of the message on success, negative values on
213 * failure.
214 *
215 */
216static int netlbl_calipso_listall_cb(struct calipso_doi *doi_def, void *arg)
217{
218 int ret_val = -ENOMEM;
219 struct netlbl_calipso_doiwalk_arg *cb_arg = arg;
220 void *data;
221
222 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
223 cb_arg->seq, &netlbl_calipso_gnl_family,
224 NLM_F_MULTI, NLBL_CALIPSO_C_LISTALL);
225 if (!data)
226 goto listall_cb_failure;
227
228 ret_val = nla_put_u32(cb_arg->skb, NLBL_CALIPSO_A_DOI, doi_def->doi);
229 if (ret_val != 0)
230 goto listall_cb_failure;
231 ret_val = nla_put_u32(cb_arg->skb,
232 NLBL_CALIPSO_A_MTYPE,
233 doi_def->type);
234 if (ret_val != 0)
235 goto listall_cb_failure;
236
237 genlmsg_end(cb_arg->skb, data);
238 return 0;
239
240listall_cb_failure:
241 genlmsg_cancel(cb_arg->skb, data);
242 return ret_val;
243}
244
245/**
246 * netlbl_calipso_listall - Handle a LISTALL message
247 * @skb: the NETLINK buffer
248 * @cb: the NETLINK callback
249 *
250 * Description:
251 * Process a user generated LISTALL message and respond accordingly. Returns
252 * zero on success and negative values on error.
253 *
254 */
255static int netlbl_calipso_listall(struct sk_buff *skb,
256 struct netlink_callback *cb)
257{
258 struct netlbl_calipso_doiwalk_arg cb_arg;
259 u32 doi_skip = cb->args[0];
260
261 cb_arg.nl_cb = cb;
262 cb_arg.skb = skb;
263 cb_arg.seq = cb->nlh->nlmsg_seq;
264
265 calipso_doi_walk(&doi_skip, netlbl_calipso_listall_cb, &cb_arg);
266
267 cb->args[0] = doi_skip;
268 return skb->len;
269}
270
271/**
272 * netlbl_calipso_remove_cb - netlbl_calipso_remove() callback for REMOVE
273 * @entry: LSM domain mapping entry
274 * @arg: the netlbl_domhsh_walk_arg structure
275 *
276 * Description:
277 * This function is intended for use by netlbl_calipso_remove() as the callback
278 * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
279 * which are associated with the CALIPSO DOI specified in @arg. Returns zero on
280 * success, negative values on failure.
281 *
282 */
283static int netlbl_calipso_remove_cb(struct netlbl_dom_map *entry, void *arg)
284{
285 struct netlbl_domhsh_walk_arg *cb_arg = arg;
286
287 if (entry->def.type == NETLBL_NLTYPE_CALIPSO &&
288 entry->def.calipso->doi == cb_arg->doi)
289 return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
290
291 return 0;
292}
293
294/**
295 * netlbl_calipso_remove - Handle a REMOVE message
296 * @skb: the NETLINK buffer
297 * @info: the Generic NETLINK info block
298 *
299 * Description:
300 * Process a user generated REMOVE message and respond accordingly. Returns
301 * zero on success, negative values on failure.
302 *
303 */
304static int netlbl_calipso_remove(struct sk_buff *skb, struct genl_info *info)
305{
306 int ret_val = -EINVAL;
307 struct netlbl_domhsh_walk_arg cb_arg;
308 struct netlbl_audit audit_info;
309 u32 skip_bkt = 0;
310 u32 skip_chain = 0;
311
312 if (!info->attrs[NLBL_CALIPSO_A_DOI])
313 return -EINVAL;
314
315 netlbl_netlink_auditinfo(&audit_info);
316 cb_arg.doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
317 cb_arg.audit_info = &audit_info;
318 ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
319 netlbl_calipso_remove_cb, &cb_arg);
320 if (ret_val == 0 || ret_val == -ENOENT) {
321 ret_val = calipso_doi_remove(cb_arg.doi, &audit_info);
322 if (ret_val == 0)
323 atomic_dec(&netlabel_mgmt_protocount);
324 }
325
326 return ret_val;
327}
328
329/* NetLabel Generic NETLINK Command Definitions
330 */
331
332static const struct genl_small_ops netlbl_calipso_ops[] = {
333 {
334 .cmd = NLBL_CALIPSO_C_ADD,
335 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
336 .flags = GENL_ADMIN_PERM,
337 .doit = netlbl_calipso_add,
338 .dumpit = NULL,
339 },
340 {
341 .cmd = NLBL_CALIPSO_C_REMOVE,
342 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
343 .flags = GENL_ADMIN_PERM,
344 .doit = netlbl_calipso_remove,
345 .dumpit = NULL,
346 },
347 {
348 .cmd = NLBL_CALIPSO_C_LIST,
349 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
350 .flags = 0,
351 .doit = netlbl_calipso_list,
352 .dumpit = NULL,
353 },
354 {
355 .cmd = NLBL_CALIPSO_C_LISTALL,
356 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
357 .flags = 0,
358 .doit = NULL,
359 .dumpit = netlbl_calipso_listall,
360 },
361};
362
363static struct genl_family netlbl_calipso_gnl_family __ro_after_init = {
364 .hdrsize = 0,
365 .name = NETLBL_NLTYPE_CALIPSO_NAME,
366 .version = NETLBL_PROTO_VERSION,
367 .maxattr = NLBL_CALIPSO_A_MAX,
368 .policy = calipso_genl_policy,
369 .module = THIS_MODULE,
370 .small_ops = netlbl_calipso_ops,
371 .n_small_ops = ARRAY_SIZE(netlbl_calipso_ops),
372 .resv_start_op = NLBL_CALIPSO_C_LISTALL + 1,
373};
374
375/* NetLabel Generic NETLINK Protocol Functions
376 */
377
378/**
379 * netlbl_calipso_genl_init - Register the CALIPSO NetLabel component
380 *
381 * Description:
382 * Register the CALIPSO packet NetLabel component with the Generic NETLINK
383 * mechanism. Returns zero on success, negative values on failure.
384 *
385 */
386int __init netlbl_calipso_genl_init(void)
387{
388 return genl_register_family(&netlbl_calipso_gnl_family);
389}
390
391/**
392 * calipso_doi_add - Add a new DOI to the CALIPSO protocol engine
393 * @doi_def: the DOI structure
394 * @audit_info: NetLabel audit information
395 *
396 * Description:
397 * The caller defines a new DOI for use by the CALIPSO engine and calls this
398 * function to add it to the list of acceptable domains. The caller must
399 * ensure that the mapping table specified in @doi_def->map meets all of the
400 * requirements of the mapping type (see calipso.h for details). Returns
401 * zero on success and non-zero on failure.
402 *
403 */
404int calipso_doi_add(struct calipso_doi *doi_def,
405 struct netlbl_audit *audit_info)
406{
407 int ret_val = -ENOMSG;
408 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
409
410 if (ops)
411 ret_val = ops->doi_add(doi_def, audit_info);
412 return ret_val;
413}
414
415/**
416 * calipso_doi_free - Frees a DOI definition
417 * @doi_def: the DOI definition
418 *
419 * Description:
420 * This function frees all of the memory associated with a DOI definition.
421 *
422 */
423void calipso_doi_free(struct calipso_doi *doi_def)
424{
425 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
426
427 if (ops)
428 ops->doi_free(doi_def);
429}
430
431/**
432 * calipso_doi_remove - Remove an existing DOI from the CALIPSO protocol engine
433 * @doi: the DOI value
434 * @audit_info: NetLabel audit information
435 *
436 * Description:
437 * Removes a DOI definition from the CALIPSO engine. The NetLabel routines will
438 * be called to release their own LSM domain mappings as well as our own
439 * domain list. Returns zero on success and negative values on failure.
440 *
441 */
442int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info)
443{
444 int ret_val = -ENOMSG;
445 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
446
447 if (ops)
448 ret_val = ops->doi_remove(doi, audit_info);
449 return ret_val;
450}
451
452/**
453 * calipso_doi_getdef - Returns a reference to a valid DOI definition
454 * @doi: the DOI value
455 *
456 * Description:
457 * Searches for a valid DOI definition and if one is found it is returned to
458 * the caller. Otherwise NULL is returned. The caller must ensure that
459 * calipso_doi_putdef() is called when the caller is done.
460 *
461 */
462struct calipso_doi *calipso_doi_getdef(u32 doi)
463{
464 struct calipso_doi *ret_val = NULL;
465 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
466
467 if (ops)
468 ret_val = ops->doi_getdef(doi);
469 return ret_val;
470}
471
472/**
473 * calipso_doi_putdef - Releases a reference for the given DOI definition
474 * @doi_def: the DOI definition
475 *
476 * Description:
477 * Releases a DOI definition reference obtained from calipso_doi_getdef().
478 *
479 */
480void calipso_doi_putdef(struct calipso_doi *doi_def)
481{
482 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
483
484 if (ops)
485 ops->doi_putdef(doi_def);
486}
487
488/**
489 * calipso_doi_walk - Iterate through the DOI definitions
490 * @skip_cnt: skip past this number of DOI definitions, updated
491 * @callback: callback for each DOI definition
492 * @cb_arg: argument for the callback function
493 *
494 * Description:
495 * Iterate over the DOI definition list, skipping the first @skip_cnt entries.
496 * For each entry call @callback, if @callback returns a negative value stop
497 * 'walking' through the list and return. Updates the value in @skip_cnt upon
498 * return. Returns zero on success, negative values on failure.
499 *
500 */
501int calipso_doi_walk(u32 *skip_cnt,
502 int (*callback)(struct calipso_doi *doi_def, void *arg),
503 void *cb_arg)
504{
505 int ret_val = -ENOMSG;
506 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
507
508 if (ops)
509 ret_val = ops->doi_walk(skip_cnt, callback, cb_arg);
510 return ret_val;
511}
512
513/**
514 * calipso_sock_getattr - Get the security attributes from a sock
515 * @sk: the sock
516 * @secattr: the security attributes
517 *
518 * Description:
519 * Query @sk to see if there is a CALIPSO option attached to the sock and if
520 * there is return the CALIPSO security attributes in @secattr. This function
521 * requires that @sk be locked, or privately held, but it does not do any
522 * locking itself. Returns zero on success and negative values on failure.
523 *
524 */
525int calipso_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
526{
527 int ret_val = -ENOMSG;
528 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
529
530 if (ops)
531 ret_val = ops->sock_getattr(sk, secattr);
532 return ret_val;
533}
534
535/**
536 * calipso_sock_setattr - Add a CALIPSO option to a socket
537 * @sk: the socket
538 * @doi_def: the CALIPSO DOI to use
539 * @secattr: the specific security attributes of the socket
540 *
541 * Description:
542 * Set the CALIPSO option on the given socket using the DOI definition and
543 * security attributes passed to the function. This function requires
544 * exclusive access to @sk, which means it either needs to be in the
545 * process of being created or locked. Returns zero on success and negative
546 * values on failure.
547 *
548 */
549int calipso_sock_setattr(struct sock *sk,
550 const struct calipso_doi *doi_def,
551 const struct netlbl_lsm_secattr *secattr)
552{
553 int ret_val = -ENOMSG;
554 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
555
556 if (ops)
557 ret_val = ops->sock_setattr(sk, doi_def, secattr);
558 return ret_val;
559}
560
561/**
562 * calipso_sock_delattr - Delete the CALIPSO option from a socket
563 * @sk: the socket
564 *
565 * Description:
566 * Removes the CALIPSO option from a socket, if present.
567 *
568 */
569void calipso_sock_delattr(struct sock *sk)
570{
571 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
572
573 if (ops)
574 ops->sock_delattr(sk);
575}
576
577/**
578 * calipso_req_setattr - Add a CALIPSO option to a connection request socket
579 * @req: the connection request socket
580 * @doi_def: the CALIPSO DOI to use
581 * @secattr: the specific security attributes of the socket
582 *
583 * Description:
584 * Set the CALIPSO option on the given socket using the DOI definition and
585 * security attributes passed to the function. Returns zero on success and
586 * negative values on failure.
587 *
588 */
589int calipso_req_setattr(struct request_sock *req,
590 const struct calipso_doi *doi_def,
591 const struct netlbl_lsm_secattr *secattr)
592{
593 int ret_val = -ENOMSG;
594 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
595
596 if (ops)
597 ret_val = ops->req_setattr(req, doi_def, secattr);
598 return ret_val;
599}
600
601/**
602 * calipso_req_delattr - Delete the CALIPSO option from a request socket
603 * @req: the request socket
604 *
605 * Description:
606 * Removes the CALIPSO option from a request socket, if present.
607 *
608 */
609void calipso_req_delattr(struct request_sock *req)
610{
611 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
612
613 if (ops)
614 ops->req_delattr(req);
615}
616
617/**
618 * calipso_optptr - Find the CALIPSO option in the packet
619 * @skb: the packet
620 *
621 * Description:
622 * Parse the packet's IP header looking for a CALIPSO option. Returns a pointer
623 * to the start of the CALIPSO option on success, NULL if one if not found.
624 *
625 */
626unsigned char *calipso_optptr(const struct sk_buff *skb)
627{
628 unsigned char *ret_val = NULL;
629 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
630
631 if (ops)
632 ret_val = ops->skbuff_optptr(skb);
633 return ret_val;
634}
635
636/**
637 * calipso_getattr - Get the security attributes from a memory block.
638 * @calipso: the CALIPSO option
639 * @secattr: the security attributes
640 *
641 * Description:
642 * Inspect @calipso and return the security attributes in @secattr.
643 * Returns zero on success and negative values on failure.
644 *
645 */
646int calipso_getattr(const unsigned char *calipso,
647 struct netlbl_lsm_secattr *secattr)
648{
649 int ret_val = -ENOMSG;
650 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
651
652 if (ops)
653 ret_val = ops->opt_getattr(calipso, secattr);
654 return ret_val;
655}
656
657/**
658 * calipso_skbuff_setattr - Set the CALIPSO option on a packet
659 * @skb: the packet
660 * @doi_def: the CALIPSO DOI to use
661 * @secattr: the security attributes
662 *
663 * Description:
664 * Set the CALIPSO option on the given packet based on the security attributes.
665 * Returns a pointer to the IP header on success and NULL on failure.
666 *
667 */
668int calipso_skbuff_setattr(struct sk_buff *skb,
669 const struct calipso_doi *doi_def,
670 const struct netlbl_lsm_secattr *secattr)
671{
672 int ret_val = -ENOMSG;
673 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
674
675 if (ops)
676 ret_val = ops->skbuff_setattr(skb, doi_def, secattr);
677 return ret_val;
678}
679
680/**
681 * calipso_skbuff_delattr - Delete any CALIPSO options from a packet
682 * @skb: the packet
683 *
684 * Description:
685 * Removes any and all CALIPSO options from the given packet. Returns zero on
686 * success, negative values on failure.
687 *
688 */
689int calipso_skbuff_delattr(struct sk_buff *skb)
690{
691 int ret_val = -ENOMSG;
692 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
693
694 if (ops)
695 ret_val = ops->skbuff_delattr(skb);
696 return ret_val;
697}
698
699/**
700 * calipso_cache_invalidate - Invalidates the current CALIPSO cache
701 *
702 * Description:
703 * Invalidates and frees any entries in the CALIPSO cache. Returns zero on
704 * success and negative values on failure.
705 *
706 */
707void calipso_cache_invalidate(void)
708{
709 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
710
711 if (ops)
712 ops->cache_invalidate();
713}
714
715/**
716 * calipso_cache_add - Add an entry to the CALIPSO cache
717 * @calipso_ptr: the CALIPSO option
718 * @secattr: the packet's security attributes
719 *
720 * Description:
721 * Add a new entry into the CALIPSO label mapping cache.
722 * Returns zero on success, negative values on failure.
723 *
724 */
725int calipso_cache_add(const unsigned char *calipso_ptr,
726 const struct netlbl_lsm_secattr *secattr)
727
728{
729 int ret_val = -ENOMSG;
730 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
731
732 if (ops)
733 ret_val = ops->cache_add(calipso_ptr, secattr);
734 return ret_val;
735}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NetLabel CALIPSO/IPv6 Support
4 *
5 * This file defines the CALIPSO/IPv6 functions for the NetLabel system. The
6 * NetLabel system manages static and dynamic label mappings for network
7 * protocols such as CIPSO and CALIPSO.
8 *
9 * Authors: Paul Moore <paul@paul-moore.com>
10 * Huw Davies <huw@codeweavers.com>
11 */
12
13/* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
14 * (c) Copyright Huw Davies <huw@codeweavers.com>, 2015
15 */
16
17#include <linux/types.h>
18#include <linux/socket.h>
19#include <linux/string.h>
20#include <linux/skbuff.h>
21#include <linux/audit.h>
22#include <linux/slab.h>
23#include <net/sock.h>
24#include <net/netlink.h>
25#include <net/genetlink.h>
26#include <net/netlabel.h>
27#include <net/calipso.h>
28#include <linux/atomic.h>
29
30#include "netlabel_user.h"
31#include "netlabel_calipso.h"
32#include "netlabel_mgmt.h"
33#include "netlabel_domainhash.h"
34
35/* Argument struct for calipso_doi_walk() */
36struct netlbl_calipso_doiwalk_arg {
37 struct netlink_callback *nl_cb;
38 struct sk_buff *skb;
39 u32 seq;
40};
41
42/* Argument struct for netlbl_domhsh_walk() */
43struct netlbl_domhsh_walk_arg {
44 struct netlbl_audit *audit_info;
45 u32 doi;
46};
47
48/* NetLabel Generic NETLINK CALIPSO family */
49static struct genl_family netlbl_calipso_gnl_family;
50
51/* NetLabel Netlink attribute policy */
52static const struct nla_policy calipso_genl_policy[NLBL_CALIPSO_A_MAX + 1] = {
53 [NLBL_CALIPSO_A_DOI] = { .type = NLA_U32 },
54 [NLBL_CALIPSO_A_MTYPE] = { .type = NLA_U32 },
55};
56
57/* NetLabel Command Handlers
58 */
59/**
60 * netlbl_calipso_add_pass - Adds a CALIPSO pass DOI definition
61 * @info: the Generic NETLINK info block
62 * @audit_info: NetLabel audit information
63 *
64 * Description:
65 * Create a new CALIPSO_MAP_PASS DOI definition based on the given ADD message
66 * and add it to the CALIPSO engine. Return zero on success and non-zero on
67 * error.
68 *
69 */
70static int netlbl_calipso_add_pass(struct genl_info *info,
71 struct netlbl_audit *audit_info)
72{
73 int ret_val;
74 struct calipso_doi *doi_def = NULL;
75
76 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
77 if (!doi_def)
78 return -ENOMEM;
79 doi_def->type = CALIPSO_MAP_PASS;
80 doi_def->doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
81 ret_val = calipso_doi_add(doi_def, audit_info);
82 if (ret_val != 0)
83 calipso_doi_free(doi_def);
84
85 return ret_val;
86}
87
88/**
89 * netlbl_calipso_add - Handle an ADD message
90 * @skb: the NETLINK buffer
91 * @info: the Generic NETLINK info block
92 *
93 * Description:
94 * Create a new DOI definition based on the given ADD message and add it to the
95 * CALIPSO engine. Returns zero on success, negative values on failure.
96 *
97 */
98static int netlbl_calipso_add(struct sk_buff *skb, struct genl_info *info)
99
100{
101 int ret_val = -EINVAL;
102 struct netlbl_audit audit_info;
103
104 if (!info->attrs[NLBL_CALIPSO_A_DOI] ||
105 !info->attrs[NLBL_CALIPSO_A_MTYPE])
106 return -EINVAL;
107
108 netlbl_netlink_auditinfo(skb, &audit_info);
109 switch (nla_get_u32(info->attrs[NLBL_CALIPSO_A_MTYPE])) {
110 case CALIPSO_MAP_PASS:
111 ret_val = netlbl_calipso_add_pass(info, &audit_info);
112 break;
113 }
114 if (ret_val == 0)
115 atomic_inc(&netlabel_mgmt_protocount);
116
117 return ret_val;
118}
119
120/**
121 * netlbl_calipso_list - Handle a LIST message
122 * @skb: the NETLINK buffer
123 * @info: the Generic NETLINK info block
124 *
125 * Description:
126 * Process a user generated LIST message and respond accordingly.
127 * Returns zero on success and negative values on error.
128 *
129 */
130static int netlbl_calipso_list(struct sk_buff *skb, struct genl_info *info)
131{
132 int ret_val;
133 struct sk_buff *ans_skb = NULL;
134 void *data;
135 u32 doi;
136 struct calipso_doi *doi_def;
137
138 if (!info->attrs[NLBL_CALIPSO_A_DOI]) {
139 ret_val = -EINVAL;
140 goto list_failure;
141 }
142
143 doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
144
145 doi_def = calipso_doi_getdef(doi);
146 if (!doi_def) {
147 ret_val = -EINVAL;
148 goto list_failure;
149 }
150
151 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
152 if (!ans_skb) {
153 ret_val = -ENOMEM;
154 goto list_failure_put;
155 }
156 data = genlmsg_put_reply(ans_skb, info, &netlbl_calipso_gnl_family,
157 0, NLBL_CALIPSO_C_LIST);
158 if (!data) {
159 ret_val = -ENOMEM;
160 goto list_failure_put;
161 }
162
163 ret_val = nla_put_u32(ans_skb, NLBL_CALIPSO_A_MTYPE, doi_def->type);
164 if (ret_val != 0)
165 goto list_failure_put;
166
167 calipso_doi_putdef(doi_def);
168
169 genlmsg_end(ans_skb, data);
170 return genlmsg_reply(ans_skb, info);
171
172list_failure_put:
173 calipso_doi_putdef(doi_def);
174list_failure:
175 kfree_skb(ans_skb);
176 return ret_val;
177}
178
179/**
180 * netlbl_calipso_listall_cb - calipso_doi_walk() callback for LISTALL
181 * @doi_def: the CALIPSO DOI definition
182 * @arg: the netlbl_calipso_doiwalk_arg structure
183 *
184 * Description:
185 * This function is designed to be used as a callback to the
186 * calipso_doi_walk() function for use in generating a response for a LISTALL
187 * message. Returns the size of the message on success, negative values on
188 * failure.
189 *
190 */
191static int netlbl_calipso_listall_cb(struct calipso_doi *doi_def, void *arg)
192{
193 int ret_val = -ENOMEM;
194 struct netlbl_calipso_doiwalk_arg *cb_arg = arg;
195 void *data;
196
197 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
198 cb_arg->seq, &netlbl_calipso_gnl_family,
199 NLM_F_MULTI, NLBL_CALIPSO_C_LISTALL);
200 if (!data)
201 goto listall_cb_failure;
202
203 ret_val = nla_put_u32(cb_arg->skb, NLBL_CALIPSO_A_DOI, doi_def->doi);
204 if (ret_val != 0)
205 goto listall_cb_failure;
206 ret_val = nla_put_u32(cb_arg->skb,
207 NLBL_CALIPSO_A_MTYPE,
208 doi_def->type);
209 if (ret_val != 0)
210 goto listall_cb_failure;
211
212 genlmsg_end(cb_arg->skb, data);
213 return 0;
214
215listall_cb_failure:
216 genlmsg_cancel(cb_arg->skb, data);
217 return ret_val;
218}
219
220/**
221 * netlbl_calipso_listall - Handle a LISTALL message
222 * @skb: the NETLINK buffer
223 * @cb: the NETLINK callback
224 *
225 * Description:
226 * Process a user generated LISTALL message and respond accordingly. Returns
227 * zero on success and negative values on error.
228 *
229 */
230static int netlbl_calipso_listall(struct sk_buff *skb,
231 struct netlink_callback *cb)
232{
233 struct netlbl_calipso_doiwalk_arg cb_arg;
234 u32 doi_skip = cb->args[0];
235
236 cb_arg.nl_cb = cb;
237 cb_arg.skb = skb;
238 cb_arg.seq = cb->nlh->nlmsg_seq;
239
240 calipso_doi_walk(&doi_skip, netlbl_calipso_listall_cb, &cb_arg);
241
242 cb->args[0] = doi_skip;
243 return skb->len;
244}
245
246/**
247 * netlbl_calipso_remove_cb - netlbl_calipso_remove() callback for REMOVE
248 * @entry: LSM domain mapping entry
249 * @arg: the netlbl_domhsh_walk_arg structure
250 *
251 * Description:
252 * This function is intended for use by netlbl_calipso_remove() as the callback
253 * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
254 * which are associated with the CALIPSO DOI specified in @arg. Returns zero on
255 * success, negative values on failure.
256 *
257 */
258static int netlbl_calipso_remove_cb(struct netlbl_dom_map *entry, void *arg)
259{
260 struct netlbl_domhsh_walk_arg *cb_arg = arg;
261
262 if (entry->def.type == NETLBL_NLTYPE_CALIPSO &&
263 entry->def.calipso->doi == cb_arg->doi)
264 return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
265
266 return 0;
267}
268
269/**
270 * netlbl_calipso_remove - Handle a REMOVE message
271 * @skb: the NETLINK buffer
272 * @info: the Generic NETLINK info block
273 *
274 * Description:
275 * Process a user generated REMOVE message and respond accordingly. Returns
276 * zero on success, negative values on failure.
277 *
278 */
279static int netlbl_calipso_remove(struct sk_buff *skb, struct genl_info *info)
280{
281 int ret_val = -EINVAL;
282 struct netlbl_domhsh_walk_arg cb_arg;
283 struct netlbl_audit audit_info;
284 u32 skip_bkt = 0;
285 u32 skip_chain = 0;
286
287 if (!info->attrs[NLBL_CALIPSO_A_DOI])
288 return -EINVAL;
289
290 netlbl_netlink_auditinfo(skb, &audit_info);
291 cb_arg.doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
292 cb_arg.audit_info = &audit_info;
293 ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
294 netlbl_calipso_remove_cb, &cb_arg);
295 if (ret_val == 0 || ret_val == -ENOENT) {
296 ret_val = calipso_doi_remove(cb_arg.doi, &audit_info);
297 if (ret_val == 0)
298 atomic_dec(&netlabel_mgmt_protocount);
299 }
300
301 return ret_val;
302}
303
304/* NetLabel Generic NETLINK Command Definitions
305 */
306
307static const struct genl_ops netlbl_calipso_ops[] = {
308 {
309 .cmd = NLBL_CALIPSO_C_ADD,
310 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
311 .flags = GENL_ADMIN_PERM,
312 .doit = netlbl_calipso_add,
313 .dumpit = NULL,
314 },
315 {
316 .cmd = NLBL_CALIPSO_C_REMOVE,
317 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
318 .flags = GENL_ADMIN_PERM,
319 .doit = netlbl_calipso_remove,
320 .dumpit = NULL,
321 },
322 {
323 .cmd = NLBL_CALIPSO_C_LIST,
324 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
325 .flags = 0,
326 .doit = netlbl_calipso_list,
327 .dumpit = NULL,
328 },
329 {
330 .cmd = NLBL_CALIPSO_C_LISTALL,
331 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
332 .flags = 0,
333 .doit = NULL,
334 .dumpit = netlbl_calipso_listall,
335 },
336};
337
338static struct genl_family netlbl_calipso_gnl_family __ro_after_init = {
339 .hdrsize = 0,
340 .name = NETLBL_NLTYPE_CALIPSO_NAME,
341 .version = NETLBL_PROTO_VERSION,
342 .maxattr = NLBL_CALIPSO_A_MAX,
343 .policy = calipso_genl_policy,
344 .module = THIS_MODULE,
345 .ops = netlbl_calipso_ops,
346 .n_ops = ARRAY_SIZE(netlbl_calipso_ops),
347};
348
349/* NetLabel Generic NETLINK Protocol Functions
350 */
351
352/**
353 * netlbl_calipso_genl_init - Register the CALIPSO NetLabel component
354 *
355 * Description:
356 * Register the CALIPSO packet NetLabel component with the Generic NETLINK
357 * mechanism. Returns zero on success, negative values on failure.
358 *
359 */
360int __init netlbl_calipso_genl_init(void)
361{
362 return genl_register_family(&netlbl_calipso_gnl_family);
363}
364
365static const struct netlbl_calipso_ops *calipso_ops;
366
367/**
368 * netlbl_calipso_ops_register - Register the CALIPSO operations
369 *
370 * Description:
371 * Register the CALIPSO packet engine operations.
372 *
373 */
374const struct netlbl_calipso_ops *
375netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops)
376{
377 return xchg(&calipso_ops, ops);
378}
379EXPORT_SYMBOL(netlbl_calipso_ops_register);
380
381static const struct netlbl_calipso_ops *netlbl_calipso_ops_get(void)
382{
383 return READ_ONCE(calipso_ops);
384}
385
386/**
387 * calipso_doi_add - Add a new DOI to the CALIPSO protocol engine
388 * @doi_def: the DOI structure
389 * @audit_info: NetLabel audit information
390 *
391 * Description:
392 * The caller defines a new DOI for use by the CALIPSO engine and calls this
393 * function to add it to the list of acceptable domains. The caller must
394 * ensure that the mapping table specified in @doi_def->map meets all of the
395 * requirements of the mapping type (see calipso.h for details). Returns
396 * zero on success and non-zero on failure.
397 *
398 */
399int calipso_doi_add(struct calipso_doi *doi_def,
400 struct netlbl_audit *audit_info)
401{
402 int ret_val = -ENOMSG;
403 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
404
405 if (ops)
406 ret_val = ops->doi_add(doi_def, audit_info);
407 return ret_val;
408}
409
410/**
411 * calipso_doi_free - Frees a DOI definition
412 * @doi_def: the DOI definition
413 *
414 * Description:
415 * This function frees all of the memory associated with a DOI definition.
416 *
417 */
418void calipso_doi_free(struct calipso_doi *doi_def)
419{
420 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
421
422 if (ops)
423 ops->doi_free(doi_def);
424}
425
426/**
427 * calipso_doi_remove - Remove an existing DOI from the CALIPSO protocol engine
428 * @doi: the DOI value
429 * @audit_secid: the LSM secid to use in the audit message
430 *
431 * Description:
432 * Removes a DOI definition from the CALIPSO engine. The NetLabel routines will
433 * be called to release their own LSM domain mappings as well as our own
434 * domain list. Returns zero on success and negative values on failure.
435 *
436 */
437int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info)
438{
439 int ret_val = -ENOMSG;
440 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
441
442 if (ops)
443 ret_val = ops->doi_remove(doi, audit_info);
444 return ret_val;
445}
446
447/**
448 * calipso_doi_getdef - Returns a reference to a valid DOI definition
449 * @doi: the DOI value
450 *
451 * Description:
452 * Searches for a valid DOI definition and if one is found it is returned to
453 * the caller. Otherwise NULL is returned. The caller must ensure that
454 * calipso_doi_putdef() is called when the caller is done.
455 *
456 */
457struct calipso_doi *calipso_doi_getdef(u32 doi)
458{
459 struct calipso_doi *ret_val = NULL;
460 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
461
462 if (ops)
463 ret_val = ops->doi_getdef(doi);
464 return ret_val;
465}
466
467/**
468 * calipso_doi_putdef - Releases a reference for the given DOI definition
469 * @doi_def: the DOI definition
470 *
471 * Description:
472 * Releases a DOI definition reference obtained from calipso_doi_getdef().
473 *
474 */
475void calipso_doi_putdef(struct calipso_doi *doi_def)
476{
477 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
478
479 if (ops)
480 ops->doi_putdef(doi_def);
481}
482
483/**
484 * calipso_doi_walk - Iterate through the DOI definitions
485 * @skip_cnt: skip past this number of DOI definitions, updated
486 * @callback: callback for each DOI definition
487 * @cb_arg: argument for the callback function
488 *
489 * Description:
490 * Iterate over the DOI definition list, skipping the first @skip_cnt entries.
491 * For each entry call @callback, if @callback returns a negative value stop
492 * 'walking' through the list and return. Updates the value in @skip_cnt upon
493 * return. Returns zero on success, negative values on failure.
494 *
495 */
496int calipso_doi_walk(u32 *skip_cnt,
497 int (*callback)(struct calipso_doi *doi_def, void *arg),
498 void *cb_arg)
499{
500 int ret_val = -ENOMSG;
501 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
502
503 if (ops)
504 ret_val = ops->doi_walk(skip_cnt, callback, cb_arg);
505 return ret_val;
506}
507
508/**
509 * calipso_sock_getattr - Get the security attributes from a sock
510 * @sk: the sock
511 * @secattr: the security attributes
512 *
513 * Description:
514 * Query @sk to see if there is a CALIPSO option attached to the sock and if
515 * there is return the CALIPSO security attributes in @secattr. This function
516 * requires that @sk be locked, or privately held, but it does not do any
517 * locking itself. Returns zero on success and negative values on failure.
518 *
519 */
520int calipso_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
521{
522 int ret_val = -ENOMSG;
523 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
524
525 if (ops)
526 ret_val = ops->sock_getattr(sk, secattr);
527 return ret_val;
528}
529
530/**
531 * calipso_sock_setattr - Add a CALIPSO option to a socket
532 * @sk: the socket
533 * @doi_def: the CALIPSO DOI to use
534 * @secattr: the specific security attributes of the socket
535 *
536 * Description:
537 * Set the CALIPSO option on the given socket using the DOI definition and
538 * security attributes passed to the function. This function requires
539 * exclusive access to @sk, which means it either needs to be in the
540 * process of being created or locked. Returns zero on success and negative
541 * values on failure.
542 *
543 */
544int calipso_sock_setattr(struct sock *sk,
545 const struct calipso_doi *doi_def,
546 const struct netlbl_lsm_secattr *secattr)
547{
548 int ret_val = -ENOMSG;
549 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
550
551 if (ops)
552 ret_val = ops->sock_setattr(sk, doi_def, secattr);
553 return ret_val;
554}
555
556/**
557 * calipso_sock_delattr - Delete the CALIPSO option from a socket
558 * @sk: the socket
559 *
560 * Description:
561 * Removes the CALIPSO option from a socket, if present.
562 *
563 */
564void calipso_sock_delattr(struct sock *sk)
565{
566 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
567
568 if (ops)
569 ops->sock_delattr(sk);
570}
571
572/**
573 * calipso_req_setattr - Add a CALIPSO option to a connection request socket
574 * @req: the connection request socket
575 * @doi_def: the CALIPSO DOI to use
576 * @secattr: the specific security attributes of the socket
577 *
578 * Description:
579 * Set the CALIPSO option on the given socket using the DOI definition and
580 * security attributes passed to the function. Returns zero on success and
581 * negative values on failure.
582 *
583 */
584int calipso_req_setattr(struct request_sock *req,
585 const struct calipso_doi *doi_def,
586 const struct netlbl_lsm_secattr *secattr)
587{
588 int ret_val = -ENOMSG;
589 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
590
591 if (ops)
592 ret_val = ops->req_setattr(req, doi_def, secattr);
593 return ret_val;
594}
595
596/**
597 * calipso_req_delattr - Delete the CALIPSO option from a request socket
598 * @reg: the request socket
599 *
600 * Description:
601 * Removes the CALIPSO option from a request socket, if present.
602 *
603 */
604void calipso_req_delattr(struct request_sock *req)
605{
606 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
607
608 if (ops)
609 ops->req_delattr(req);
610}
611
612/**
613 * calipso_optptr - Find the CALIPSO option in the packet
614 * @skb: the packet
615 *
616 * Description:
617 * Parse the packet's IP header looking for a CALIPSO option. Returns a pointer
618 * to the start of the CALIPSO option on success, NULL if one if not found.
619 *
620 */
621unsigned char *calipso_optptr(const struct sk_buff *skb)
622{
623 unsigned char *ret_val = NULL;
624 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
625
626 if (ops)
627 ret_val = ops->skbuff_optptr(skb);
628 return ret_val;
629}
630
631/**
632 * calipso_getattr - Get the security attributes from a memory block.
633 * @calipso: the CALIPSO option
634 * @secattr: the security attributes
635 *
636 * Description:
637 * Inspect @calipso and return the security attributes in @secattr.
638 * Returns zero on success and negative values on failure.
639 *
640 */
641int calipso_getattr(const unsigned char *calipso,
642 struct netlbl_lsm_secattr *secattr)
643{
644 int ret_val = -ENOMSG;
645 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
646
647 if (ops)
648 ret_val = ops->opt_getattr(calipso, secattr);
649 return ret_val;
650}
651
652/**
653 * calipso_skbuff_setattr - Set the CALIPSO option on a packet
654 * @skb: the packet
655 * @doi_def: the CALIPSO DOI to use
656 * @secattr: the security attributes
657 *
658 * Description:
659 * Set the CALIPSO option on the given packet based on the security attributes.
660 * Returns a pointer to the IP header on success and NULL on failure.
661 *
662 */
663int calipso_skbuff_setattr(struct sk_buff *skb,
664 const struct calipso_doi *doi_def,
665 const struct netlbl_lsm_secattr *secattr)
666{
667 int ret_val = -ENOMSG;
668 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
669
670 if (ops)
671 ret_val = ops->skbuff_setattr(skb, doi_def, secattr);
672 return ret_val;
673}
674
675/**
676 * calipso_skbuff_delattr - Delete any CALIPSO options from a packet
677 * @skb: the packet
678 *
679 * Description:
680 * Removes any and all CALIPSO options from the given packet. Returns zero on
681 * success, negative values on failure.
682 *
683 */
684int calipso_skbuff_delattr(struct sk_buff *skb)
685{
686 int ret_val = -ENOMSG;
687 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
688
689 if (ops)
690 ret_val = ops->skbuff_delattr(skb);
691 return ret_val;
692}
693
694/**
695 * calipso_cache_invalidate - Invalidates the current CALIPSO cache
696 *
697 * Description:
698 * Invalidates and frees any entries in the CALIPSO cache. Returns zero on
699 * success and negative values on failure.
700 *
701 */
702void calipso_cache_invalidate(void)
703{
704 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
705
706 if (ops)
707 ops->cache_invalidate();
708}
709
710/**
711 * calipso_cache_add - Add an entry to the CALIPSO cache
712 * @calipso_ptr: the CALIPSO option
713 * @secattr: the packet's security attributes
714 *
715 * Description:
716 * Add a new entry into the CALIPSO label mapping cache.
717 * Returns zero on success, negative values on failure.
718 *
719 */
720int calipso_cache_add(const unsigned char *calipso_ptr,
721 const struct netlbl_lsm_secattr *secattr)
722
723{
724 int ret_val = -ENOMSG;
725 const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
726
727 if (ops)
728 ret_val = ops->cache_add(calipso_ptr, secattr);
729 return ret_val;
730}