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[PATCH] Fix up page_mkclean_one(): virtual caches, s390
[deliverable/linux.git] / net / netlabel / netlabel_cipso_v4.c
CommitLineData
96cb8e33
PM		 1/*
2 * NetLabel CIPSO/IPv4 Support
3 *
4 * This file defines the CIPSO/IPv4 functions for the NetLabel system. The
5 * NetLabel system manages static and dynamic label mappings for network
6 * protocols such as CIPSO and RIPSO.
7 *
8 * Author: Paul Moore <paul.moore@hp.com>
9 *
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
23 * the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 *
29 */
30
31#include <linux/types.h>
32#include <linux/socket.h>
33#include <linux/string.h>
34#include <linux/skbuff.h>
32f50cde 35#include <linux/audit.h>
96cb8e33
PM		 36#include <net/sock.h>
37#include <net/netlink.h>
38#include <net/genetlink.h>
39#include <net/netlabel.h>
40#include <net/cipso_ipv4.h>
41
42#include "netlabel_user.h"
43#include "netlabel_cipso_v4.h"
44
fd385855
PM		 45/* Argument struct for cipso_v4_doi_walk() */
46struct netlbl_cipsov4_doiwalk_arg {
47 struct netlink_callback *nl_cb;
48 struct sk_buff *skb;
49 u32 seq;
50};
51
96cb8e33
PM		 52/* NetLabel Generic NETLINK CIPSOv4 family */
53static struct genl_family netlbl_cipsov4_gnl_family = {
54 .id = GENL_ID_GENERATE,
55 .hdrsize = 0,
56 .name = NETLBL_NLTYPE_CIPSOV4_NAME,
57 .version = NETLBL_PROTO_VERSION,
fd385855 58 .maxattr = NLBL_CIPSOV4_A_MAX,
96cb8e33
PM		 59};
60
fd385855
PM		 61/* NetLabel Netlink attribute policy */
62static struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1] = {
63 [NLBL_CIPSOV4_A_DOI] = { .type = NLA_U32 },
64 [NLBL_CIPSOV4_A_MTYPE] = { .type = NLA_U32 },
65 [NLBL_CIPSOV4_A_TAG] = { .type = NLA_U8 },
66 [NLBL_CIPSOV4_A_TAGLST] = { .type = NLA_NESTED },
67 [NLBL_CIPSOV4_A_MLSLVLLOC] = { .type = NLA_U32 },
68 [NLBL_CIPSOV4_A_MLSLVLREM] = { .type = NLA_U32 },
69 [NLBL_CIPSOV4_A_MLSLVL] = { .type = NLA_NESTED },
70 [NLBL_CIPSOV4_A_MLSLVLLST] = { .type = NLA_NESTED },
71 [NLBL_CIPSOV4_A_MLSCATLOC] = { .type = NLA_U32 },
72 [NLBL_CIPSOV4_A_MLSCATREM] = { .type = NLA_U32 },
73 [NLBL_CIPSOV4_A_MLSCAT] = { .type = NLA_NESTED },
74 [NLBL_CIPSOV4_A_MLSCATLST] = { .type = NLA_NESTED },
75};
96cb8e33
PM		 76
77/*
78 * Helper Functions
79 */
80
81/**
82 * netlbl_cipsov4_doi_free - Frees a CIPSO V4 DOI definition
83 * @entry: the entry's RCU field
84 *
85 * Description:
86 * This function is designed to be used as a callback to the call_rcu()
87 * function so that the memory allocated to the DOI definition can be released
88 * safely.
89 *
90 */
91static void netlbl_cipsov4_doi_free(struct rcu_head *entry)
92{
93 struct cipso_v4_doi *ptr;
94
95 ptr = container_of(entry, struct cipso_v4_doi, rcu);
96 switch (ptr->type) {
97 case CIPSO_V4_MAP_STD:
98 kfree(ptr->map.std->lvl.cipso);
99 kfree(ptr->map.std->lvl.local);
100 kfree(ptr->map.std->cat.cipso);
101 kfree(ptr->map.std->cat.local);
102 break;
103 }
104 kfree(ptr);
105}
106
fd385855
PM		 107/**
108 * netlbl_cipsov4_add_common - Parse the common sections of a ADD message
109 * @info: the Generic NETLINK info block
110 * @doi_def: the CIPSO V4 DOI definition
111 *
112 * Description:
113 * Parse the common sections of a ADD message and fill in the related values
114 * in @doi_def. Returns zero on success, negative values on failure.
115 *
116 */
117static int netlbl_cipsov4_add_common(struct genl_info *info,
118 struct cipso_v4_doi *doi_def)
119{
120 struct nlattr *nla;
121 int nla_rem;
122 u32 iter = 0;
123
124 doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
125
126 if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_TAGLST],
127 NLBL_CIPSOV4_A_MAX,
128 netlbl_cipsov4_genl_policy) != 0)
129 return -EINVAL;
130
131 nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
132 if (nla->nla_type == NLBL_CIPSOV4_A_TAG) {
133 if (iter > CIPSO_V4_TAG_MAXCNT)
134 return -EINVAL;
135 doi_def->tags[iter++] = nla_get_u8(nla);
136 }
137 if (iter < CIPSO_V4_TAG_MAXCNT)
138 doi_def->tags[iter] = CIPSO_V4_TAG_INVALID;
139
140 return 0;
141}
96cb8e33
PM		 142
143/*
144 * NetLabel Command Handlers
145 */
146
147/**
148 * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
fd385855 149 * @info: the Generic NETLINK info block
96cb8e33
PM		 150 *
151 * Description:
152 * Create a new CIPSO_V4_MAP_STD DOI definition based on the given ADD message
153 * and add it to the CIPSO V4 engine. Return zero on success and non-zero on
154 * error.
155 *
156 */
fd385855 157static int netlbl_cipsov4_add_std(struct genl_info *info)
96cb8e33
PM		 158{
159 int ret_val = -EINVAL;
96cb8e33 160 struct cipso_v4_doi *doi_def = NULL;
fd385855
PM		 161 struct nlattr *nla_a;
162 struct nlattr *nla_b;
163 int nla_a_rem;
164 int nla_b_rem;
96cb8e33 165
32f50cde 166 if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] ||
fd385855
PM		 167 !info->attrs[NLBL_CIPSOV4_A_MLSLVLLST])
168 return -EINVAL;
169
170 if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
171 NLBL_CIPSOV4_A_MAX,
172 netlbl_cipsov4_genl_policy) != 0)
173 return -EINVAL;
96cb8e33
PM		 174
175 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
fd385855
PM		 176 if (doi_def == NULL)
177 return -ENOMEM;
96cb8e33
PM		 178 doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
179 if (doi_def->map.std == NULL) {
180 ret_val = -ENOMEM;
181 goto add_std_failure;
182 }
183 doi_def->type = CIPSO_V4_MAP_STD;
184
fd385855
PM		 185 ret_val = netlbl_cipsov4_add_common(info, doi_def);
186 if (ret_val != 0)
96cb8e33
PM		 187 goto add_std_failure;
188
fd385855
PM		 189 nla_for_each_nested(nla_a,
190 info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
191 nla_a_rem)
192 if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSLVL) {
193 nla_for_each_nested(nla_b, nla_a, nla_b_rem)
194 switch (nla_b->nla_type) {
195 case NLBL_CIPSOV4_A_MLSLVLLOC:
196 if (nla_get_u32(nla_b) >=
197 doi_def->map.std->lvl.local_size)
198 doi_def->map.std->lvl.local_size =
199 nla_get_u32(nla_b) + 1;
200 break;
201 case NLBL_CIPSOV4_A_MLSLVLREM:
202 if (nla_get_u32(nla_b) >=
203 doi_def->map.std->lvl.cipso_size)
204 doi_def->map.std->lvl.cipso_size =
205 nla_get_u32(nla_b) + 1;
206 break;
207 }
208 }
209 if (doi_def->map.std->lvl.local_size > CIPSO_V4_MAX_LOC_LVLS ||
210 doi_def->map.std->lvl.cipso_size > CIPSO_V4_MAX_REM_LVLS)
96cb8e33
PM		 211 goto add_std_failure;
212 doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
213 sizeof(u32),
214 GFP_KERNEL);
215 if (doi_def->map.std->lvl.local == NULL) {
216 ret_val = -ENOMEM;
217 goto add_std_failure;
218 }
96cb8e33
PM		 219 doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
220 sizeof(u32),
221 GFP_KERNEL);
222 if (doi_def->map.std->lvl.cipso == NULL) {
223 ret_val = -ENOMEM;
224 goto add_std_failure;
225 }
fd385855
PM		 226 nla_for_each_nested(nla_a,
227 info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
228 nla_a_rem)
229 if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSLVL) {
230 struct nlattr *lvl_loc;
231 struct nlattr *lvl_rem;
232
233 if (nla_validate_nested(nla_a,
234 NLBL_CIPSOV4_A_MAX,
235 netlbl_cipsov4_genl_policy) != 0)
236 goto add_std_failure;
237
238 lvl_loc = nla_find_nested(nla_a,
239 NLBL_CIPSOV4_A_MLSLVLLOC);
240 lvl_rem = nla_find_nested(nla_a,
241 NLBL_CIPSOV4_A_MLSLVLREM);
242 if (lvl_loc == NULL || lvl_rem == NULL)
243 goto add_std_failure;
244 doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] =
245 nla_get_u32(lvl_rem);
246 doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] =
247 nla_get_u32(lvl_loc);
248 }
96cb8e33 249
fd385855
PM		 250 if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
251 if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
252 NLBL_CIPSOV4_A_MAX,
253 netlbl_cipsov4_genl_policy) != 0)
254 goto add_std_failure;
255
256 nla_for_each_nested(nla_a,
257 info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
258 nla_a_rem)
259 if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSCAT) {
260 if (nla_validate_nested(nla_a,
261 NLBL_CIPSOV4_A_MAX,
262 netlbl_cipsov4_genl_policy) != 0)
263 goto add_std_failure;
264 nla_for_each_nested(nla_b, nla_a, nla_b_rem)
265 switch (nla_b->nla_type) {
266 case NLBL_CIPSOV4_A_MLSCATLOC:
267 if (nla_get_u32(nla_b) >=
268 doi_def->map.std->cat.local_size)
269 doi_def->map.std->cat.local_size =
270 nla_get_u32(nla_b) + 1;
271 break;
272 case NLBL_CIPSOV4_A_MLSCATREM:
273 if (nla_get_u32(nla_b) >=
274 doi_def->map.std->cat.cipso_size)
275 doi_def->map.std->cat.cipso_size =
276 nla_get_u32(nla_b) + 1;
277 break;
278 }
279 }
280 if (doi_def->map.std->cat.local_size > CIPSO_V4_MAX_LOC_CATS ||
281 doi_def->map.std->cat.cipso_size > CIPSO_V4_MAX_REM_CATS)
282 goto add_std_failure;
283 doi_def->map.std->cat.local = kcalloc(
284 doi_def->map.std->cat.local_size,
96cb8e33
PM		 285 sizeof(u32),
286 GFP_KERNEL);
fd385855
PM		 287 if (doi_def->map.std->cat.local == NULL) {
288 ret_val = -ENOMEM;
289 goto add_std_failure;
290 }
291 doi_def->map.std->cat.cipso = kcalloc(
292 doi_def->map.std->cat.cipso_size,
96cb8e33
PM		 293 sizeof(u32),
294 GFP_KERNEL);
fd385855
PM		 295 if (doi_def->map.std->cat.cipso == NULL) {
296 ret_val = -ENOMEM;
96cb8e33 297 goto add_std_failure;
fd385855
PM		 298 }
299 nla_for_each_nested(nla_a,
300 info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
301 nla_a_rem)
302 if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSCAT) {
303 struct nlattr *cat_loc;
304 struct nlattr *cat_rem;
305
306 cat_loc = nla_find_nested(nla_a,
307 NLBL_CIPSOV4_A_MLSCATLOC);
308 cat_rem = nla_find_nested(nla_a,
309 NLBL_CIPSOV4_A_MLSCATREM);
310 if (cat_loc == NULL || cat_rem == NULL)
311 goto add_std_failure;
312 doi_def->map.std->cat.local[
313 nla_get_u32(cat_loc)] =
314 nla_get_u32(cat_rem);
315 doi_def->map.std->cat.cipso[
316 nla_get_u32(cat_rem)] =
317 nla_get_u32(cat_loc);
318 }
96cb8e33
PM		 319 }
320
96cb8e33
PM		 321 ret_val = cipso_v4_doi_add(doi_def);
322 if (ret_val != 0)
323 goto add_std_failure;
324 return 0;
325
326add_std_failure:
327 if (doi_def)
328 netlbl_cipsov4_doi_free(&doi_def->rcu);
329 return ret_val;
330}
331
332/**
333 * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
fd385855 334 * @info: the Generic NETLINK info block
96cb8e33
PM		 335 *
336 * Description:
337 * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
338 * and add it to the CIPSO V4 engine. Return zero on success and non-zero on
339 * error.
340 *
341 */
fd385855 342static int netlbl_cipsov4_add_pass(struct genl_info *info)
96cb8e33 343{
fd385855 344 int ret_val;
96cb8e33 345 struct cipso_v4_doi *doi_def = NULL;
96cb8e33 346
32f50cde 347 if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
fd385855 348 return -EINVAL;
96cb8e33
PM		 349
350 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
fd385855
PM		 351 if (doi_def == NULL)
352 return -ENOMEM;
96cb8e33
PM		 353 doi_def->type = CIPSO_V4_MAP_PASS;
354
fd385855
PM		 355 ret_val = netlbl_cipsov4_add_common(info, doi_def);
356 if (ret_val != 0)
357 goto add_pass_failure;
96cb8e33 358
96cb8e33
PM		 359 ret_val = cipso_v4_doi_add(doi_def);
360 if (ret_val != 0)
361 goto add_pass_failure;
362 return 0;
363
364add_pass_failure:
fd385855 365 netlbl_cipsov4_doi_free(&doi_def->rcu);
96cb8e33
PM		 366 return ret_val;
367}
368
369/**
370 * netlbl_cipsov4_add - Handle an ADD message
371 * @skb: the NETLINK buffer
372 * @info: the Generic NETLINK info block
373 *
374 * Description:
375 * Create a new DOI definition based on the given ADD message and add it to the
376 * CIPSO V4 engine. Returns zero on success, negative values on failure.
377 *
378 */
379static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
380
381{
382 int ret_val = -EINVAL;
32f50cde
PM		 383 u32 type;
384 u32 doi;
385 const char *type_str = "(unknown)";
386 struct audit_buffer *audit_buf;
95d4e6be 387 struct netlbl_audit audit_info;
96cb8e33 388
32f50cde
PM		 389 if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
390 !info->attrs[NLBL_CIPSOV4_A_MTYPE])
fd385855 391 return -EINVAL;
96cb8e33 392
95d4e6be
PM		 393 doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
394 netlbl_netlink_auditinfo(skb, &audit_info);
395
32f50cde
PM		 396 type = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE]);
397 switch (type) {
96cb8e33 398 case CIPSO_V4_MAP_STD:
32f50cde 399 type_str = "std";
fd385855 400 ret_val = netlbl_cipsov4_add_std(info);
96cb8e33
PM		 401 break;
402 case CIPSO_V4_MAP_PASS:
32f50cde 403 type_str = "pass";
fd385855 404 ret_val = netlbl_cipsov4_add_pass(info);
96cb8e33
PM		 405 break;
406 }
407
95d4e6be
PM		 408 audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
409 &audit_info);
de64688f
PM		 410 if (audit_buf != NULL) {
411 audit_log_format(audit_buf,
412 " cipso_doi=%u cipso_type=%s res=%u",
413 doi,
414 type_str,
415 ret_val == 0 ? 1 : 0);
416 audit_log_end(audit_buf);
417 }
32f50cde 418
96cb8e33
PM		 419 return ret_val;
420}
421
422/**
423 * netlbl_cipsov4_list - Handle a LIST message
424 * @skb: the NETLINK buffer
425 * @info: the Generic NETLINK info block
426 *
427 * Description:
fd385855
PM		 428 * Process a user generated LIST message and respond accordingly. While the
429 * response message generated by the kernel is straightforward, determining
430 * before hand the size of the buffer to allocate is not (we have to generate
431 * the message to know the size). In order to keep this function sane what we
432 * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
433 * that size, if we fail then we restart with a larger buffer and try again.
434 * We continue in this manner until we hit a limit of failed attempts then we
435 * give up and just send an error message. Returns zero on success and
436 * negative values on error.
96cb8e33
PM		 437 *
438 */
439static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
440{
fd385855
PM		 441 int ret_val;
442 struct sk_buff *ans_skb = NULL;
443 u32 nlsze_mult = 1;
444 void *data;
96cb8e33 445 u32 doi;
fd385855
PM		 446 struct nlattr *nla_a;
447 struct nlattr *nla_b;
448 struct cipso_v4_doi *doi_def;
449 u32 iter;
96cb8e33 450
fd385855
PM		 451 if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
452 ret_val = -EINVAL;
96cb8e33 453 goto list_failure;
fd385855 454 }
96cb8e33 455
fd385855 456list_start:
339bf98f 457 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL);
96cb8e33
PM		 458 if (ans_skb == NULL) {
459 ret_val = -ENOMEM;
460 goto list_failure;
461 }
17c157c8
TG		 462 data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family,
463 0, NLBL_CIPSOV4_C_LIST);
fd385855
PM		 464 if (data == NULL) {
465 ret_val = -ENOMEM;
466 goto list_failure;
467 }
468
469 doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
470
471 rcu_read_lock();
472 doi_def = cipso_v4_doi_getdef(doi);
473 if (doi_def == NULL) {
474 ret_val = -EINVAL;
475 goto list_failure;
476 }
477
478 ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
479 if (ret_val != 0)
480 goto list_failure_lock;
481
482 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST);
483 if (nla_a == NULL) {
484 ret_val = -ENOMEM;
485 goto list_failure_lock;
486 }
487 for (iter = 0;
488 iter < CIPSO_V4_TAG_MAXCNT &&
489 doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
490 iter++) {
491 ret_val = nla_put_u8(ans_skb,
492 NLBL_CIPSOV4_A_TAG,
493 doi_def->tags[iter]);
494 if (ret_val != 0)
495 goto list_failure_lock;
496 }
497 nla_nest_end(ans_skb, nla_a);
498
499 switch (doi_def->type) {
500 case CIPSO_V4_MAP_STD:
501 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
502 if (nla_a == NULL) {
503 ret_val = -ENOMEM;
504 goto list_failure_lock;
505 }
506 for (iter = 0;
507 iter < doi_def->map.std->lvl.local_size;
508 iter++) {
509 if (doi_def->map.std->lvl.local[iter] ==
510 CIPSO_V4_INV_LVL)
511 continue;
512
513 nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL);
514 if (nla_b == NULL) {
515 ret_val = -ENOMEM;
516 goto list_retry;
517 }
518 ret_val = nla_put_u32(ans_skb,
519 NLBL_CIPSOV4_A_MLSLVLLOC,
520 iter);
521 if (ret_val != 0)
522 goto list_retry;
523 ret_val = nla_put_u32(ans_skb,
524 NLBL_CIPSOV4_A_MLSLVLREM,
525 doi_def->map.std->lvl.local[iter]);
526 if (ret_val != 0)
527 goto list_retry;
528 nla_nest_end(ans_skb, nla_b);
529 }
530 nla_nest_end(ans_skb, nla_a);
531
532 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST);
533 if (nla_a == NULL) {
534 ret_val = -ENOMEM;
535 goto list_retry;
536 }
537 for (iter = 0;
538 iter < doi_def->map.std->cat.local_size;
539 iter++) {
540 if (doi_def->map.std->cat.local[iter] ==
541 CIPSO_V4_INV_CAT)
542 continue;
543
544 nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT);
545 if (nla_b == NULL) {
546 ret_val = -ENOMEM;
547 goto list_retry;
548 }
549 ret_val = nla_put_u32(ans_skb,
550 NLBL_CIPSOV4_A_MLSCATLOC,
551 iter);
552 if (ret_val != 0)
553 goto list_retry;
554 ret_val = nla_put_u32(ans_skb,
555 NLBL_CIPSOV4_A_MLSCATREM,
556 doi_def->map.std->cat.local[iter]);
557 if (ret_val != 0)
558 goto list_retry;
559 nla_nest_end(ans_skb, nla_b);
560 }
561 nla_nest_end(ans_skb, nla_a);
562
563 break;
564 }
565 rcu_read_unlock();
96cb8e33 566
fd385855
PM		 567 genlmsg_end(ans_skb, data);
568
81878d27 569 ret_val = genlmsg_reply(ans_skb, info);
96cb8e33
PM		 570 if (ret_val != 0)
571 goto list_failure;
572
573 return 0;
574
fd385855
PM		 575list_retry:
576 /* XXX - this limit is a guesstimate */
577 if (nlsze_mult < 4) {
578 rcu_read_unlock();
579 kfree_skb(ans_skb);
580 nlsze_mult++;
581 goto list_start;
582 }
583list_failure_lock:
584 rcu_read_unlock();
96cb8e33 585list_failure:
fd385855
PM		 586 kfree_skb(ans_skb);
587 return ret_val;
588}
589
590/**
591 * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
592 * @doi_def: the CIPSOv4 DOI definition
593 * @arg: the netlbl_cipsov4_doiwalk_arg structure
594 *
595 * Description:
596 * This function is designed to be used as a callback to the
597 * cipso_v4_doi_walk() function for use in generating a response for a LISTALL
598 * message. Returns the size of the message on success, negative values on
599 * failure.
600 *
601 */
602static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
603{
604 int ret_val = -ENOMEM;
605 struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
606 void *data;
607
17c157c8
TG		 608 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
609 cb_arg->seq, &netlbl_cipsov4_gnl_family,
610 NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL);
fd385855
PM		 611 if (data == NULL)
612 goto listall_cb_failure;
613
614 ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
615 if (ret_val != 0)
616 goto listall_cb_failure;
617 ret_val = nla_put_u32(cb_arg->skb,
618 NLBL_CIPSOV4_A_MTYPE,
619 doi_def->type);
620 if (ret_val != 0)
621 goto listall_cb_failure;
622
623 return genlmsg_end(cb_arg->skb, data);
624
625listall_cb_failure:
626 genlmsg_cancel(cb_arg->skb, data);
96cb8e33
PM		 627 return ret_val;
628}
629
630/**
631 * netlbl_cipsov4_listall - Handle a LISTALL message
632 * @skb: the NETLINK buffer
fd385855 633 * @cb: the NETLINK callback
96cb8e33
PM		 634 *
635 * Description:
636 * Process a user generated LISTALL message and respond accordingly. Returns
637 * zero on success and negative values on error.
638 *
639 */
fd385855
PM		 640static int netlbl_cipsov4_listall(struct sk_buff *skb,
641 struct netlink_callback *cb)
96cb8e33 642{
fd385855
PM		 643 struct netlbl_cipsov4_doiwalk_arg cb_arg;
644 int doi_skip = cb->args[0];
96cb8e33 645
fd385855
PM		 646 cb_arg.nl_cb = cb;
647 cb_arg.skb = skb;
648 cb_arg.seq = cb->nlh->nlmsg_seq;
96cb8e33 649
fd385855 650 cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
96cb8e33 651
fd385855
PM		 652 cb->args[0] = doi_skip;
653 return skb->len;
96cb8e33
PM		 654}
655
656/**
657 * netlbl_cipsov4_remove - Handle a REMOVE message
658 * @skb: the NETLINK buffer
659 * @info: the Generic NETLINK info block
660 *
661 * Description:
662 * Process a user generated REMOVE message and respond accordingly. Returns
663 * zero on success, negative values on failure.
664 *
665 */
666static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
667{
fd385855 668 int ret_val = -EINVAL;
32f50cde
PM		 669 u32 doi = 0;
670 struct audit_buffer *audit_buf;
95d4e6be 671 struct netlbl_audit audit_info;
96cb8e33 672
95d4e6be
PM		 673 if (!info->attrs[NLBL_CIPSOV4_A_DOI])
674 return -EINVAL;
32f50cde 675
95d4e6be
PM		 676 doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
677 netlbl_netlink_auditinfo(skb, &audit_info);
678
679 ret_val = cipso_v4_doi_remove(doi,
680 &audit_info,
681 netlbl_cipsov4_doi_free);
682
683 audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL,
684 &audit_info);
de64688f
PM		 685 if (audit_buf != NULL) {
686 audit_log_format(audit_buf,
687 " cipso_doi=%u res=%u",
688 doi,
689 ret_val == 0 ? 1 : 0);
690 audit_log_end(audit_buf);
691 }
96cb8e33 692
96cb8e33
PM		 693 return ret_val;
694}
695
696/*
697 * NetLabel Generic NETLINK Command Definitions
698 */
699
700static struct genl_ops netlbl_cipsov4_genl_c_add = {
701 .cmd = NLBL_CIPSOV4_C_ADD,
fd385855
PM		 702 .flags = GENL_ADMIN_PERM,
703 .policy = netlbl_cipsov4_genl_policy,
96cb8e33
PM		 704 .doit = netlbl_cipsov4_add,
705 .dumpit = NULL,
706};
707
708static struct genl_ops netlbl_cipsov4_genl_c_remove = {
709 .cmd = NLBL_CIPSOV4_C_REMOVE,
fd385855
PM		 710 .flags = GENL_ADMIN_PERM,
711 .policy = netlbl_cipsov4_genl_policy,
96cb8e33
PM		 712 .doit = netlbl_cipsov4_remove,
713 .dumpit = NULL,
714};
715
716static struct genl_ops netlbl_cipsov4_genl_c_list = {
717 .cmd = NLBL_CIPSOV4_C_LIST,
718 .flags = 0,
fd385855 719 .policy = netlbl_cipsov4_genl_policy,
96cb8e33
PM		 720 .doit = netlbl_cipsov4_list,
721 .dumpit = NULL,
722};
723
724static struct genl_ops netlbl_cipsov4_genl_c_listall = {
725 .cmd = NLBL_CIPSOV4_C_LISTALL,
726 .flags = 0,
fd385855
PM		 727 .policy = netlbl_cipsov4_genl_policy,
728 .doit = NULL,
729 .dumpit = netlbl_cipsov4_listall,
96cb8e33
PM		 730};
731
732/*
733 * NetLabel Generic NETLINK Protocol Functions
734 */
735
736/**
737 * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
738 *
739 * Description:
740 * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
741 * mechanism. Returns zero on success, negative values on failure.
742 *
743 */
744int netlbl_cipsov4_genl_init(void)
745{
746 int ret_val;
747
748 ret_val = genl_register_family(&netlbl_cipsov4_gnl_family);
749 if (ret_val != 0)
750 return ret_val;
751
752 ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
753 &netlbl_cipsov4_genl_c_add);
754 if (ret_val != 0)
755 return ret_val;
756 ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
757 &netlbl_cipsov4_genl_c_remove);
758 if (ret_val != 0)
759 return ret_val;
760 ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
761 &netlbl_cipsov4_genl_c_list);
762 if (ret_val != 0)
763 return ret_val;
764 ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
765 &netlbl_cipsov4_genl_c_listall);
766 if (ret_val != 0)
767 return ret_val;
768
769 return 0;
770}
Linux kernel - Deliverables
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