1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * NetLabel CIPSO/IPv4 Support
4 *
5 * This file defines the CIPSO/IPv4 functions for the NetLabel system. The
6 * NetLabel system manages static and dynamic label mappings for network
7 * protocols such as CIPSO and RIPSO.
8 *
9 * Author: Paul Moore <paul@paul-moore.com>
10 */
11
12 /*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
14 */
15
16 #include <linux/types.h>
17 #include <linux/socket.h>
18 #include <linux/string.h>
19 #include <linux/skbuff.h>
20 #include <linux/audit.h>
21 #include <linux/slab.h>
22 #include <net/sock.h>
23 #include <net/netlink.h>
24 #include <net/genetlink.h>
25 #include <net/netlabel.h>
26 #include <net/cipso_ipv4.h>
27 #include <linux/atomic.h>
28
29 #include "netlabel_user.h"
30 #include "netlabel_cipso_v4.h"
31 #include "netlabel_mgmt.h"
32 #include "netlabel_domainhash.h"
33
34 /* Argument struct for cipso_v4_doi_walk() */
35 struct netlbl_cipsov4_doiwalk_arg {
36 struct netlink_callback *nl_cb;
37 struct sk_buff *skb;
38 u32 seq;
39 };
40
41 /* Argument struct for netlbl_domhsh_walk() */
42 struct netlbl_domhsh_walk_arg {
43 struct netlbl_audit *audit_info;
44 u32 doi;
45 };
46
47 /* NetLabel Generic NETLINK CIPSOv4 family */
48 static struct genl_family netlbl_cipsov4_gnl_family;
49 /* NetLabel Netlink attribute policy */
50 static const struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1] = {
51 [NLBL_CIPSOV4_A_DOI] = { .type = NLA_U32 },
52 [NLBL_CIPSOV4_A_MTYPE] = { .type = NLA_U32 },
53 [NLBL_CIPSOV4_A_TAG] = { .type = NLA_U8 },
54 [NLBL_CIPSOV4_A_TAGLST] = { .type = NLA_NESTED },
55 [NLBL_CIPSOV4_A_MLSLVLLOC] = { .type = NLA_U32 },
56 [NLBL_CIPSOV4_A_MLSLVLREM] = { .type = NLA_U32 },
57 [NLBL_CIPSOV4_A_MLSLVL] = { .type = NLA_NESTED },
58 [NLBL_CIPSOV4_A_MLSLVLLST] = { .type = NLA_NESTED },
59 [NLBL_CIPSOV4_A_MLSCATLOC] = { .type = NLA_U32 },
60 [NLBL_CIPSOV4_A_MLSCATREM] = { .type = NLA_U32 },
61 [NLBL_CIPSOV4_A_MLSCAT] = { .type = NLA_NESTED },
62 [NLBL_CIPSOV4_A_MLSCATLST] = { .type = NLA_NESTED },
63 };
64
65 /*
66 * Helper Functions
67 */
68
69 /**
70 * netlbl_cipsov4_add_common - Parse the common sections of a ADD message
71 * @info: the Generic NETLINK info block
72 * @doi_def: the CIPSO V4 DOI definition
73 *
74 * Description:
75 * Parse the common sections of a ADD message and fill in the related values
76 * in @doi_def. Returns zero on success, negative values on failure.
77 *
78 */
79 static int netlbl_cipsov4_add_common(struct genl_info *info,
80 struct cipso_v4_doi *doi_def)
81 {
82 struct nlattr *nla;
83 int nla_rem;
84 u32 iter = 0;
85
86 doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
87
88 if (nla_validate_nested_deprecated(info->attrs[NLBL_CIPSOV4_A_TAGLST],
89 NLBL_CIPSOV4_A_MAX,
90 netlbl_cipsov4_genl_policy,
91 NULL) != 0)
92 return -EINVAL;
93
94 nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
95 if (nla_type(nla) == NLBL_CIPSOV4_A_TAG) {
96 if (iter >= CIPSO_V4_TAG_MAXCNT)
97 return -EINVAL;
98 doi_def->tags[iter++] = nla_get_u8(nla);
99 }
100 while (iter < CIPSO_V4_TAG_MAXCNT)
101 doi_def->tags[iter++] = CIPSO_V4_TAG_INVALID;
102
103 return 0;
104 }
105
106 /*
107 * NetLabel Command Handlers
108 */
109
110 /**
111 * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
112 * @info: the Generic NETLINK info block
113 * @audit_info: NetLabel audit information
114 *
115 * Description:
116 * Create a new CIPSO_V4_MAP_TRANS DOI definition based on the given ADD
117 * message and add it to the CIPSO V4 engine. Return zero on success and
118 * non-zero on error.
119 *
120 */
121 static int netlbl_cipsov4_add_std(struct genl_info *info,
122 struct netlbl_audit *audit_info)
123 {
124 int ret_val = -EINVAL;
125 struct cipso_v4_doi *doi_def = NULL;
126 struct nlattr *nla_a;
127 struct nlattr *nla_b;
128 int nla_a_rem;
129 int nla_b_rem;
130 u32 iter;
131
132 if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] ||
133 !info->attrs[NLBL_CIPSOV4_A_MLSLVLLST])
134 return -EINVAL;
135
136 if (nla_validate_nested_deprecated(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
137 NLBL_CIPSOV4_A_MAX,
138 netlbl_cipsov4_genl_policy,
139 NULL) != 0)
140 return -EINVAL;
141
142 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
143 if (doi_def == NULL)
144 return -ENOMEM;
145 doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
146 if (doi_def->map.std == NULL) {
147 kfree(doi_def);
148 return -ENOMEM;
149 }
150 doi_def->type = CIPSO_V4_MAP_TRANS;
151
152 ret_val = netlbl_cipsov4_add_common(info, doi_def);
153 if (ret_val != 0)
154 goto add_std_failure;
155 ret_val = -EINVAL;
156
157 nla_for_each_nested(nla_a,
158 info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
159 nla_a_rem)
160 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
161 if (nla_validate_nested_deprecated(nla_a,
162 NLBL_CIPSOV4_A_MAX,
163 netlbl_cipsov4_genl_policy,
164 NULL) != 0)
165 goto add_std_failure;
166 nla_for_each_nested(nla_b, nla_a, nla_b_rem)
167 switch (nla_type(nla_b)) {
168 case NLBL_CIPSOV4_A_MLSLVLLOC:
169 if (nla_get_u32(nla_b) >
170 CIPSO_V4_MAX_LOC_LVLS)
171 goto add_std_failure;
172 if (nla_get_u32(nla_b) >=
173 doi_def->map.std->lvl.local_size)
174 doi_def->map.std->lvl.local_size =
175 nla_get_u32(nla_b) + 1;
176 break;
177 case NLBL_CIPSOV4_A_MLSLVLREM:
178 if (nla_get_u32(nla_b) >
179 CIPSO_V4_MAX_REM_LVLS)
180 goto add_std_failure;
181 if (nla_get_u32(nla_b) >=
182 doi_def->map.std->lvl.cipso_size)
183 doi_def->map.std->lvl.cipso_size =
184 nla_get_u32(nla_b) + 1;
185 break;
186 }
187 }
188 doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
189 sizeof(u32),
190 GFP_KERNEL | __GFP_NOWARN);
191 if (doi_def->map.std->lvl.local == NULL) {
192 ret_val = -ENOMEM;
193 goto add_std_failure;
194 }
195 doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
196 sizeof(u32),
197 GFP_KERNEL | __GFP_NOWARN);
198 if (doi_def->map.std->lvl.cipso == NULL) {
199 ret_val = -ENOMEM;
200 goto add_std_failure;
201 }
202 for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++)
203 doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL;
204 for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++)
205 doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL;
206 nla_for_each_nested(nla_a,
207 info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
208 nla_a_rem)
209 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
210 struct nlattr *lvl_loc;
211 struct nlattr *lvl_rem;
212
213 lvl_loc = nla_find_nested(nla_a,
214 NLBL_CIPSOV4_A_MLSLVLLOC);
215 lvl_rem = nla_find_nested(nla_a,
216 NLBL_CIPSOV4_A_MLSLVLREM);
217 if (lvl_loc == NULL || lvl_rem == NULL)
218 goto add_std_failure;
219 doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] =
220 nla_get_u32(lvl_rem);
221 doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] =
222 nla_get_u32(lvl_loc);
223 }
224
225 if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
226 if (nla_validate_nested_deprecated(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
227 NLBL_CIPSOV4_A_MAX,
228 netlbl_cipsov4_genl_policy,
229 NULL) != 0)
230 goto add_std_failure;
231
232 nla_for_each_nested(nla_a,
233 info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
234 nla_a_rem)
235 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
236 if (nla_validate_nested_deprecated(nla_a,
237 NLBL_CIPSOV4_A_MAX,
238 netlbl_cipsov4_genl_policy,
239 NULL) != 0)
240 goto add_std_failure;
241 nla_for_each_nested(nla_b, nla_a, nla_b_rem)
242 switch (nla_type(nla_b)) {
243 case NLBL_CIPSOV4_A_MLSCATLOC:
244 if (nla_get_u32(nla_b) >
245 CIPSO_V4_MAX_LOC_CATS)
246 goto add_std_failure;
247 if (nla_get_u32(nla_b) >=
248 doi_def->map.std->cat.local_size)
249 doi_def->map.std->cat.local_size =
250 nla_get_u32(nla_b) + 1;
251 break;
252 case NLBL_CIPSOV4_A_MLSCATREM:
253 if (nla_get_u32(nla_b) >
254 CIPSO_V4_MAX_REM_CATS)
255 goto add_std_failure;
256 if (nla_get_u32(nla_b) >=
257 doi_def->map.std->cat.cipso_size)
258 doi_def->map.std->cat.cipso_size =
259 nla_get_u32(nla_b) + 1;
260 break;
261 }
262 }
263 doi_def->map.std->cat.local = kcalloc(
264 doi_def->map.std->cat.local_size,
265 sizeof(u32),
266 GFP_KERNEL | __GFP_NOWARN);
267 if (doi_def->map.std->cat.local == NULL) {
268 ret_val = -ENOMEM;
269 goto add_std_failure;
270 }
271 doi_def->map.std->cat.cipso = kcalloc(
272 doi_def->map.std->cat.cipso_size,
273 sizeof(u32),
274 GFP_KERNEL | __GFP_NOWARN);
275 if (doi_def->map.std->cat.cipso == NULL) {
276 ret_val = -ENOMEM;
277 goto add_std_failure;
278 }
279 for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++)
280 doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT;
281 for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++)
282 doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT;
283 nla_for_each_nested(nla_a,
284 info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
285 nla_a_rem)
286 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
287 struct nlattr *cat_loc;
288 struct nlattr *cat_rem;
289
290 cat_loc = nla_find_nested(nla_a,
291 NLBL_CIPSOV4_A_MLSCATLOC);
292 cat_rem = nla_find_nested(nla_a,
293 NLBL_CIPSOV4_A_MLSCATREM);
294 if (cat_loc == NULL || cat_rem == NULL)
295 goto add_std_failure;
296 doi_def->map.std->cat.local[
297 nla_get_u32(cat_loc)] =
298 nla_get_u32(cat_rem);
299 doi_def->map.std->cat.cipso[
300 nla_get_u32(cat_rem)] =
301 nla_get_u32(cat_loc);
302 }
303 }
304
305 ret_val = cipso_v4_doi_add(doi_def, audit_info);
306 if (ret_val != 0)
307 goto add_std_failure;
308 return 0;
309
310 add_std_failure:
311 cipso_v4_doi_free(doi_def);
312 return ret_val;
313 }
314
315 /**
316 * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
317 * @info: the Generic NETLINK info block
318 * @audit_info: NetLabel audit information
319 *
320 * Description:
321 * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
322 * and add it to the CIPSO V4 engine. Return zero on success and non-zero on
323 * error.
324 *
325 */
326 static int netlbl_cipsov4_add_pass(struct genl_info *info,
327 struct netlbl_audit *audit_info)
328 {
329 int ret_val;
330 struct cipso_v4_doi *doi_def = NULL;
331
332 if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
333 return -EINVAL;
334
335 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
336 if (doi_def == NULL)
337 return -ENOMEM;
338 doi_def->type = CIPSO_V4_MAP_PASS;
339
340 ret_val = netlbl_cipsov4_add_common(info, doi_def);
341 if (ret_val != 0)
342 goto add_pass_failure;
343
344 ret_val = cipso_v4_doi_add(doi_def, audit_info);
345 if (ret_val != 0)
346 goto add_pass_failure;
347 return 0;
348
349 add_pass_failure:
350 cipso_v4_doi_free(doi_def);
351 return ret_val;
352 }
353
354 /**
355 * netlbl_cipsov4_add_local - Adds a CIPSO V4 DOI definition
356 * @info: the Generic NETLINK info block
357 * @audit_info: NetLabel audit information
358 *
359 * Description:
360 * Create a new CIPSO_V4_MAP_LOCAL DOI definition based on the given ADD
361 * message and add it to the CIPSO V4 engine. Return zero on success and
362 * non-zero on error.
363 *
364 */
365 static int netlbl_cipsov4_add_local(struct genl_info *info,
366 struct netlbl_audit *audit_info)
367 {
368 int ret_val;
369 struct cipso_v4_doi *doi_def = NULL;
370
371 if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
372 return -EINVAL;
373
374 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
375 if (doi_def == NULL)
376 return -ENOMEM;
377 doi_def->type = CIPSO_V4_MAP_LOCAL;
378
379 ret_val = netlbl_cipsov4_add_common(info, doi_def);
380 if (ret_val != 0)
381 goto add_local_failure;
382
383 ret_val = cipso_v4_doi_add(doi_def, audit_info);
384 if (ret_val != 0)
385 goto add_local_failure;
386 return 0;
387
388 add_local_failure:
389 cipso_v4_doi_free(doi_def);
390 return ret_val;
391 }
392
393 /**
394 * netlbl_cipsov4_add - Handle an ADD message
395 * @skb: the NETLINK buffer
396 * @info: the Generic NETLINK info block
397 *
398 * Description:
399 * Create a new DOI definition based on the given ADD message and add it to the
400 * CIPSO V4 engine. Returns zero on success, negative values on failure.
401 *
402 */
403 static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
404
405 {
406 int ret_val = -EINVAL;
407 struct netlbl_audit audit_info;
408
409 if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
410 !info->attrs[NLBL_CIPSOV4_A_MTYPE])
411 return -EINVAL;
412
413 netlbl_netlink_auditinfo(&audit_info);
414 switch (nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE])) {
415 case CIPSO_V4_MAP_TRANS:
416 ret_val = netlbl_cipsov4_add_std(info, &audit_info);
417 break;
418 case CIPSO_V4_MAP_PASS:
419 ret_val = netlbl_cipsov4_add_pass(info, &audit_info);
420 break;
421 case CIPSO_V4_MAP_LOCAL:
422 ret_val = netlbl_cipsov4_add_local(info, &audit_info);
423 break;
424 }
425 if (ret_val == 0)
426 atomic_inc(&netlabel_mgmt_protocount);
427
428 return ret_val;
429 }
430
431 /**
432 * netlbl_cipsov4_list - Handle a LIST message
433 * @skb: the NETLINK buffer
434 * @info: the Generic NETLINK info block
435 *
436 * Description:
437 * Process a user generated LIST message and respond accordingly. While the
438 * response message generated by the kernel is straightforward, determining
439 * before hand the size of the buffer to allocate is not (we have to generate
440 * the message to know the size). In order to keep this function sane what we
441 * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
442 * that size, if we fail then we restart with a larger buffer and try again.
443 * We continue in this manner until we hit a limit of failed attempts then we
444 * give up and just send an error message. Returns zero on success and
445 * negative values on error.
446 *
447 */
448 static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
449 {
450 int ret_val;
451 struct sk_buff *ans_skb = NULL;
452 u32 nlsze_mult = 1;
453 void *data;
454 u32 doi;
455 struct nlattr *nla_a;
456 struct nlattr *nla_b;
457 struct cipso_v4_doi *doi_def;
458 u32 iter;
459
460 if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
461 ret_val = -EINVAL;
462 goto list_failure;
463 }
464
465 list_start:
466 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL);
467 if (ans_skb == NULL) {
468 ret_val = -ENOMEM;
469 goto list_failure;
470 }
471 data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family,
472 0, NLBL_CIPSOV4_C_LIST);
473 if (data == NULL) {
474 ret_val = -ENOMEM;
475 goto list_failure;
476 }
477
478 doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
479
480 rcu_read_lock();
481 doi_def = cipso_v4_doi_getdef(doi);
482 if (doi_def == NULL) {
483 ret_val = -EINVAL;
484 goto list_failure_lock;
485 }
486
487 ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
488 if (ret_val != 0)
489 goto list_failure_lock;
490
491 nla_a = nla_nest_start_noflag(ans_skb, NLBL_CIPSOV4_A_TAGLST);
492 if (nla_a == NULL) {
493 ret_val = -ENOMEM;
494 goto list_failure_lock;
495 }
496 for (iter = 0;
497 iter < CIPSO_V4_TAG_MAXCNT &&
498 doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
499 iter++) {
500 ret_val = nla_put_u8(ans_skb,
501 NLBL_CIPSOV4_A_TAG,
502 doi_def->tags[iter]);
503 if (ret_val != 0)
504 goto list_failure_lock;
505 }
506 nla_nest_end(ans_skb, nla_a);
507
508 switch (doi_def->type) {
509 case CIPSO_V4_MAP_TRANS:
510 nla_a = nla_nest_start_noflag(ans_skb,
511 NLBL_CIPSOV4_A_MLSLVLLST);
512 if (nla_a == NULL) {
513 ret_val = -ENOMEM;
514 goto list_failure_lock;
515 }
516 for (iter = 0;
517 iter < doi_def->map.std->lvl.local_size;
518 iter++) {
519 if (doi_def->map.std->lvl.local[iter] ==
520 CIPSO_V4_INV_LVL)
521 continue;
522
523 nla_b = nla_nest_start_noflag(ans_skb,
524 NLBL_CIPSOV4_A_MLSLVL);
525 if (nla_b == NULL) {
526 ret_val = -ENOMEM;
527 goto list_retry;
528 }
529 ret_val = nla_put_u32(ans_skb,
530 NLBL_CIPSOV4_A_MLSLVLLOC,
531 iter);
532 if (ret_val != 0)
533 goto list_retry;
534 ret_val = nla_put_u32(ans_skb,
535 NLBL_CIPSOV4_A_MLSLVLREM,
536 doi_def->map.std->lvl.local[iter]);
537 if (ret_val != 0)
538 goto list_retry;
539 nla_nest_end(ans_skb, nla_b);
540 }
541 nla_nest_end(ans_skb, nla_a);
542
543 nla_a = nla_nest_start_noflag(ans_skb,
544 NLBL_CIPSOV4_A_MLSCATLST);
545 if (nla_a == NULL) {
546 ret_val = -ENOMEM;
547 goto list_retry;
548 }
549 for (iter = 0;
550 iter < doi_def->map.std->cat.local_size;
551 iter++) {
552 if (doi_def->map.std->cat.local[iter] ==
553 CIPSO_V4_INV_CAT)
554 continue;
555
556 nla_b = nla_nest_start_noflag(ans_skb,
557 NLBL_CIPSOV4_A_MLSCAT);
558 if (nla_b == NULL) {
559 ret_val = -ENOMEM;
560 goto list_retry;
561 }
562 ret_val = nla_put_u32(ans_skb,
563 NLBL_CIPSOV4_A_MLSCATLOC,
564 iter);
565 if (ret_val != 0)
566 goto list_retry;
567 ret_val = nla_put_u32(ans_skb,
568 NLBL_CIPSOV4_A_MLSCATREM,
569 doi_def->map.std->cat.local[iter]);
570 if (ret_val != 0)
571 goto list_retry;
572 nla_nest_end(ans_skb, nla_b);
573 }
574 nla_nest_end(ans_skb, nla_a);
575
576 break;
577 }
578 cipso_v4_doi_putdef(doi_def);
579 rcu_read_unlock();
580
581 genlmsg_end(ans_skb, data);
582 return genlmsg_reply(ans_skb, info);
583
584 list_retry:
585 /* XXX - this limit is a guesstimate */
586 if (nlsze_mult < 4) {
587 cipso_v4_doi_putdef(doi_def);
588 rcu_read_unlock();
589 kfree_skb(ans_skb);
590 nlsze_mult *= 2;
591 goto list_start;
592 }
593 list_failure_lock:
594 cipso_v4_doi_putdef(doi_def);
595 rcu_read_unlock();
596 list_failure:
597 kfree_skb(ans_skb);
598 return ret_val;
599 }
600
601 /**
602 * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
603 * @doi_def: the CIPSOv4 DOI definition
604 * @arg: the netlbl_cipsov4_doiwalk_arg structure
605 *
606 * Description:
607 * This function is designed to be used as a callback to the
608 * cipso_v4_doi_walk() function for use in generating a response for a LISTALL
609 * message. Returns the size of the message on success, negative values on
610 * failure.
611 *
612 */
613 static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
614 {
615 int ret_val = -ENOMEM;
616 struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
617 void *data;
618
619 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
620 cb_arg->seq, &netlbl_cipsov4_gnl_family,
621 NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL);
622 if (data == NULL)
623 goto listall_cb_failure;
624
625 ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
626 if (ret_val != 0)
627 goto listall_cb_failure;
628 ret_val = nla_put_u32(cb_arg->skb,
629 NLBL_CIPSOV4_A_MTYPE,
630 doi_def->type);
631 if (ret_val != 0)
632 goto listall_cb_failure;
633
634 genlmsg_end(cb_arg->skb, data);
635 return 0;
636
637 listall_cb_failure:
638 genlmsg_cancel(cb_arg->skb, data);
639 return ret_val;
640 }
641
642 /**
643 * netlbl_cipsov4_listall - Handle a LISTALL message
644 * @skb: the NETLINK buffer
645 * @cb: the NETLINK callback
646 *
647 * Description:
648 * Process a user generated LISTALL message and respond accordingly. Returns
649 * zero on success and negative values on error.
650 *
651 */
652 static int netlbl_cipsov4_listall(struct sk_buff *skb,
653 struct netlink_callback *cb)
654 {
655 struct netlbl_cipsov4_doiwalk_arg cb_arg;
656 u32 doi_skip = cb->args[0];
657
658 cb_arg.nl_cb = cb;
659 cb_arg.skb = skb;
660 cb_arg.seq = cb->nlh->nlmsg_seq;
661
662 cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
663
664 cb->args[0] = doi_skip;
665 return skb->len;
666 }
667
668 /**
669 * netlbl_cipsov4_remove_cb - netlbl_cipsov4_remove() callback for REMOVE
670 * @entry: LSM domain mapping entry
671 * @arg: the netlbl_domhsh_walk_arg structure
672 *
673 * Description:
674 * This function is intended for use by netlbl_cipsov4_remove() as the callback
675 * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
676 * which are associated with the CIPSO DOI specified in @arg. Returns zero on
677 * success, negative values on failure.
678 *
679 */
680 static int netlbl_cipsov4_remove_cb(struct netlbl_dom_map *entry, void *arg)
681 {
682 struct netlbl_domhsh_walk_arg *cb_arg = arg;
683
684 if (entry->def.type == NETLBL_NLTYPE_CIPSOV4 &&
685 entry->def.cipso->doi == cb_arg->doi)
686 return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
687
688 return 0;
689 }
690
691 /**
692 * netlbl_cipsov4_remove - Handle a REMOVE message
693 * @skb: the NETLINK buffer
694 * @info: the Generic NETLINK info block
695 *
696 * Description:
697 * Process a user generated REMOVE message and respond accordingly. Returns
698 * zero on success, negative values on failure.
699 *
700 */
701 static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
702 {
703 int ret_val = -EINVAL;
704 struct netlbl_domhsh_walk_arg cb_arg;
705 struct netlbl_audit audit_info;
706 u32 skip_bkt = 0;
707 u32 skip_chain = 0;
708
709 if (!info->attrs[NLBL_CIPSOV4_A_DOI])
710 return -EINVAL;
711
712 netlbl_netlink_auditinfo(&audit_info);
713 cb_arg.doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
714 cb_arg.audit_info = &audit_info;
715 ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
716 netlbl_cipsov4_remove_cb, &cb_arg);
717 if (ret_val == 0 || ret_val == -ENOENT) {
718 ret_val = cipso_v4_doi_remove(cb_arg.doi, &audit_info);
719 if (ret_val == 0)
720 atomic_dec(&netlabel_mgmt_protocount);
721 }
722
723 return ret_val;
724 }
725
726 /*
727 * NetLabel Generic NETLINK Command Definitions
728 */
729
730 static const struct genl_small_ops netlbl_cipsov4_ops[] = {
731 {
732 .cmd = NLBL_CIPSOV4_C_ADD,
733 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
734 .flags = GENL_ADMIN_PERM,
735 .doit = netlbl_cipsov4_add,
736 .dumpit = NULL,
737 },
738 {
739 .cmd = NLBL_CIPSOV4_C_REMOVE,
740 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
741 .flags = GENL_ADMIN_PERM,
742 .doit = netlbl_cipsov4_remove,
743 .dumpit = NULL,
744 },
745 {
746 .cmd = NLBL_CIPSOV4_C_LIST,
747 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
748 .flags = 0,
749 .doit = netlbl_cipsov4_list,
750 .dumpit = NULL,
751 },
752 {
753 .cmd = NLBL_CIPSOV4_C_LISTALL,
754 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
755 .flags = 0,
756 .doit = NULL,
757 .dumpit = netlbl_cipsov4_listall,
758 },
759 };
760
761 static struct genl_family netlbl_cipsov4_gnl_family __ro_after_init = {
762 .hdrsize = 0,
763 .name = NETLBL_NLTYPE_CIPSOV4_NAME,
764 .version = NETLBL_PROTO_VERSION,
765 .maxattr = NLBL_CIPSOV4_A_MAX,
766 .policy = netlbl_cipsov4_genl_policy,
767 .module = THIS_MODULE,
768 .small_ops = netlbl_cipsov4_ops,
769 .n_small_ops = ARRAY_SIZE(netlbl_cipsov4_ops),
770 .resv_start_op = NLBL_CIPSOV4_C_LISTALL + 1,
771 };
772
773 /*
774 * NetLabel Generic NETLINK Protocol Functions
775 */
776
777 /**
778 * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
779 *
780 * Description:
781 * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
782 * mechanism. Returns zero on success, negative values on failure.
783 *
784 */
785 int __init netlbl_cipsov4_genl_init(void)
786 {
787 return genl_register_family(&netlbl_cipsov4_gnl_family);
788 }
789
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