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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 *
82c21bfa 8 * Author: Paul Moore <paul@paul-moore.com>
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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>
5a0e3ad6 36#include <linux/slab.h>
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37#include <net/sock.h>
38#include <net/netlink.h>
39#include <net/genetlink.h>
40#include <net/netlabel.h>
41#include <net/cipso_ipv4.h>
60063497 42#include <linux/atomic.h>
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43
44#include "netlabel_user.h"
45#include "netlabel_cipso_v4.h"
23bcdc1a 46#include "netlabel_mgmt.h"
b1edeb10 47#include "netlabel_domainhash.h"
96cb8e33 48
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49/* Argument struct for cipso_v4_doi_walk() */
50struct netlbl_cipsov4_doiwalk_arg {
51 struct netlink_callback *nl_cb;
52 struct sk_buff *skb;
53 u32 seq;
54};
55
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56/* Argument struct for netlbl_domhsh_walk() */
57struct netlbl_domhsh_walk_arg {
58 struct netlbl_audit *audit_info;
59 u32 doi;
60};
61
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62/* NetLabel Generic NETLINK CIPSOv4 family */
63static struct genl_family netlbl_cipsov4_gnl_family = {
64 .id = GENL_ID_GENERATE,
65 .hdrsize = 0,
66 .name = NETLBL_NLTYPE_CIPSOV4_NAME,
67 .version = NETLBL_PROTO_VERSION,
fd385855 68 .maxattr = NLBL_CIPSOV4_A_MAX,
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69};
70
fd385855 71/* NetLabel Netlink attribute policy */
ef7c79ed 72static const struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1] = {
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73 [NLBL_CIPSOV4_A_DOI] = { .type = NLA_U32 },
74 [NLBL_CIPSOV4_A_MTYPE] = { .type = NLA_U32 },
75 [NLBL_CIPSOV4_A_TAG] = { .type = NLA_U8 },
76 [NLBL_CIPSOV4_A_TAGLST] = { .type = NLA_NESTED },
77 [NLBL_CIPSOV4_A_MLSLVLLOC] = { .type = NLA_U32 },
78 [NLBL_CIPSOV4_A_MLSLVLREM] = { .type = NLA_U32 },
79 [NLBL_CIPSOV4_A_MLSLVL] = { .type = NLA_NESTED },
80 [NLBL_CIPSOV4_A_MLSLVLLST] = { .type = NLA_NESTED },
81 [NLBL_CIPSOV4_A_MLSCATLOC] = { .type = NLA_U32 },
82 [NLBL_CIPSOV4_A_MLSCATREM] = { .type = NLA_U32 },
83 [NLBL_CIPSOV4_A_MLSCAT] = { .type = NLA_NESTED },
84 [NLBL_CIPSOV4_A_MLSCATLST] = { .type = NLA_NESTED },
85};
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86
87/*
88 * Helper Functions
89 */
90
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91/**
92 * netlbl_cipsov4_add_common - Parse the common sections of a ADD message
93 * @info: the Generic NETLINK info block
94 * @doi_def: the CIPSO V4 DOI definition
95 *
96 * Description:
97 * Parse the common sections of a ADD message and fill in the related values
98 * in @doi_def. Returns zero on success, negative values on failure.
99 *
100 */
101static int netlbl_cipsov4_add_common(struct genl_info *info,
102 struct cipso_v4_doi *doi_def)
103{
104 struct nlattr *nla;
105 int nla_rem;
106 u32 iter = 0;
107
108 doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
109
110 if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_TAGLST],
111 NLBL_CIPSOV4_A_MAX,
112 netlbl_cipsov4_genl_policy) != 0)
113 return -EINVAL;
114
115 nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
8f4c1f9b 116 if (nla_type(nla) == NLBL_CIPSOV4_A_TAG) {
2a2f11c2 117 if (iter >= CIPSO_V4_TAG_MAXCNT)
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118 return -EINVAL;
119 doi_def->tags[iter++] = nla_get_u8(nla);
120 }
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121 while (iter < CIPSO_V4_TAG_MAXCNT)
122 doi_def->tags[iter++] = CIPSO_V4_TAG_INVALID;
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123
124 return 0;
125}
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126
127/*
128 * NetLabel Command Handlers
129 */
130
131/**
132 * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
fd385855 133 * @info: the Generic NETLINK info block
6c2e8ac0 134 * @audit_info: NetLabel audit information
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135 *
136 * Description:
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137 * Create a new CIPSO_V4_MAP_TRANS DOI definition based on the given ADD
138 * message and add it to the CIPSO V4 engine. Return zero on success and
139 * non-zero on error.
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140 *
141 */
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142static int netlbl_cipsov4_add_std(struct genl_info *info,
143 struct netlbl_audit *audit_info)
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144{
145 int ret_val = -EINVAL;
96cb8e33 146 struct cipso_v4_doi *doi_def = NULL;
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147 struct nlattr *nla_a;
148 struct nlattr *nla_b;
149 int nla_a_rem;
150 int nla_b_rem;
caff5b6a 151 u32 iter;
96cb8e33 152
32f50cde 153 if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] ||
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154 !info->attrs[NLBL_CIPSOV4_A_MLSLVLLST])
155 return -EINVAL;
156
157 if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
158 NLBL_CIPSOV4_A_MAX,
159 netlbl_cipsov4_genl_policy) != 0)
160 return -EINVAL;
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161
162 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
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163 if (doi_def == NULL)
164 return -ENOMEM;
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165 doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
166 if (doi_def->map.std == NULL) {
167 ret_val = -ENOMEM;
168 goto add_std_failure;
169 }
15c45f7b 170 doi_def->type = CIPSO_V4_MAP_TRANS;
96cb8e33 171
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172 ret_val = netlbl_cipsov4_add_common(info, doi_def);
173 if (ret_val != 0)
96cb8e33 174 goto add_std_failure;
1fd2a25b 175 ret_val = -EINVAL;
96cb8e33 176
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177 nla_for_each_nested(nla_a,
178 info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
179 nla_a_rem)
8f4c1f9b 180 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
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181 if (nla_validate_nested(nla_a,
182 NLBL_CIPSOV4_A_MAX,
183 netlbl_cipsov4_genl_policy) != 0)
184 goto add_std_failure;
fd385855 185 nla_for_each_nested(nla_b, nla_a, nla_b_rem)
8f4c1f9b 186 switch (nla_type(nla_b)) {
fd385855 187 case NLBL_CIPSOV4_A_MLSLVLLOC:
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188 if (nla_get_u32(nla_b) >
189 CIPSO_V4_MAX_LOC_LVLS)
190 goto add_std_failure;
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191 if (nla_get_u32(nla_b) >=
192 doi_def->map.std->lvl.local_size)
193 doi_def->map.std->lvl.local_size =
194 nla_get_u32(nla_b) + 1;
195 break;
196 case NLBL_CIPSOV4_A_MLSLVLREM:
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197 if (nla_get_u32(nla_b) >
198 CIPSO_V4_MAX_REM_LVLS)
199 goto add_std_failure;
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200 if (nla_get_u32(nla_b) >=
201 doi_def->map.std->lvl.cipso_size)
202 doi_def->map.std->lvl.cipso_size =
203 nla_get_u32(nla_b) + 1;
204 break;
205 }
206 }
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207 doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
208 sizeof(u32),
209 GFP_KERNEL);
210 if (doi_def->map.std->lvl.local == NULL) {
211 ret_val = -ENOMEM;
212 goto add_std_failure;
213 }
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214 doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
215 sizeof(u32),
216 GFP_KERNEL);
217 if (doi_def->map.std->lvl.cipso == NULL) {
218 ret_val = -ENOMEM;
219 goto add_std_failure;
220 }
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221 for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++)
222 doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL;
223 for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++)
224 doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL;
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225 nla_for_each_nested(nla_a,
226 info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
227 nla_a_rem)
8f4c1f9b 228 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
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229 struct nlattr *lvl_loc;
230 struct nlattr *lvl_rem;
231
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232 lvl_loc = nla_find_nested(nla_a,
233 NLBL_CIPSOV4_A_MLSLVLLOC);
234 lvl_rem = nla_find_nested(nla_a,
235 NLBL_CIPSOV4_A_MLSLVLREM);
236 if (lvl_loc == NULL || lvl_rem == NULL)
237 goto add_std_failure;
238 doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] =
239 nla_get_u32(lvl_rem);
240 doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] =
241 nla_get_u32(lvl_loc);
242 }
96cb8e33 243
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244 if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
245 if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
246 NLBL_CIPSOV4_A_MAX,
247 netlbl_cipsov4_genl_policy) != 0)
248 goto add_std_failure;
249
250 nla_for_each_nested(nla_a,
251 info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
252 nla_a_rem)
8f4c1f9b 253 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
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254 if (nla_validate_nested(nla_a,
255 NLBL_CIPSOV4_A_MAX,
256 netlbl_cipsov4_genl_policy) != 0)
257 goto add_std_failure;
258 nla_for_each_nested(nla_b, nla_a, nla_b_rem)
8f4c1f9b 259 switch (nla_type(nla_b)) {
fd385855 260 case NLBL_CIPSOV4_A_MLSCATLOC:
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261 if (nla_get_u32(nla_b) >
262 CIPSO_V4_MAX_LOC_CATS)
263 goto add_std_failure;
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264 if (nla_get_u32(nla_b) >=
265 doi_def->map.std->cat.local_size)
266 doi_def->map.std->cat.local_size =
267 nla_get_u32(nla_b) + 1;
268 break;
269 case NLBL_CIPSOV4_A_MLSCATREM:
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270 if (nla_get_u32(nla_b) >
271 CIPSO_V4_MAX_REM_CATS)
272 goto add_std_failure;
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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 }
fd385855 280 doi_def->map.std->cat.local = kcalloc(
e1a95265 281 doi_def->map.std->cat.local_size,
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282 sizeof(u32),
283 GFP_KERNEL);
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284 if (doi_def->map.std->cat.local == NULL) {
285 ret_val = -ENOMEM;
286 goto add_std_failure;
287 }
288 doi_def->map.std->cat.cipso = kcalloc(
e1a95265 289 doi_def->map.std->cat.cipso_size,
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290 sizeof(u32),
291 GFP_KERNEL);
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292 if (doi_def->map.std->cat.cipso == NULL) {
293 ret_val = -ENOMEM;
96cb8e33 294 goto add_std_failure;
fd385855 295 }
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296 for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++)
297 doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT;
298 for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++)
299 doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT;
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300 nla_for_each_nested(nla_a,
301 info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
302 nla_a_rem)
8f4c1f9b 303 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
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304 struct nlattr *cat_loc;
305 struct nlattr *cat_rem;
306
307 cat_loc = nla_find_nested(nla_a,
308 NLBL_CIPSOV4_A_MLSCATLOC);
309 cat_rem = nla_find_nested(nla_a,
310 NLBL_CIPSOV4_A_MLSCATREM);
311 if (cat_loc == NULL || cat_rem == NULL)
312 goto add_std_failure;
313 doi_def->map.std->cat.local[
e1a95265 314 nla_get_u32(cat_loc)] =
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315 nla_get_u32(cat_rem);
316 doi_def->map.std->cat.cipso[
e1a95265 317 nla_get_u32(cat_rem)] =
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318 nla_get_u32(cat_loc);
319 }
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320 }
321
6c2e8ac0 322 ret_val = cipso_v4_doi_add(doi_def, audit_info);
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323 if (ret_val != 0)
324 goto add_std_failure;
325 return 0;
326
327add_std_failure:
328 if (doi_def)
b1edeb10 329 cipso_v4_doi_free(doi_def);
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330 return ret_val;
331}
332
333/**
334 * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
fd385855 335 * @info: the Generic NETLINK info block
6c2e8ac0 336 * @audit_info: NetLabel audit information
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337 *
338 * Description:
339 * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
340 * and add it to the CIPSO V4 engine. Return zero on success and non-zero on
341 * error.
342 *
343 */
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344static int netlbl_cipsov4_add_pass(struct genl_info *info,
345 struct netlbl_audit *audit_info)
96cb8e33 346{
fd385855 347 int ret_val;
96cb8e33 348 struct cipso_v4_doi *doi_def = NULL;
96cb8e33 349
32f50cde 350 if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
fd385855 351 return -EINVAL;
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352
353 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
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354 if (doi_def == NULL)
355 return -ENOMEM;
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356 doi_def->type = CIPSO_V4_MAP_PASS;
357
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358 ret_val = netlbl_cipsov4_add_common(info, doi_def);
359 if (ret_val != 0)
360 goto add_pass_failure;
96cb8e33 361
6c2e8ac0 362 ret_val = cipso_v4_doi_add(doi_def, audit_info);
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363 if (ret_val != 0)
364 goto add_pass_failure;
365 return 0;
366
367add_pass_failure:
b1edeb10 368 cipso_v4_doi_free(doi_def);
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369 return ret_val;
370}
371
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372/**
373 * netlbl_cipsov4_add_local - Adds a CIPSO V4 DOI definition
374 * @info: the Generic NETLINK info block
6c2e8ac0 375 * @audit_info: NetLabel audit information
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376 *
377 * Description:
378 * Create a new CIPSO_V4_MAP_LOCAL DOI definition based on the given ADD
379 * message and add it to the CIPSO V4 engine. Return zero on success and
380 * non-zero on error.
381 *
382 */
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383static int netlbl_cipsov4_add_local(struct genl_info *info,
384 struct netlbl_audit *audit_info)
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385{
386 int ret_val;
387 struct cipso_v4_doi *doi_def = NULL;
388
389 if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
390 return -EINVAL;
391
392 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
393 if (doi_def == NULL)
394 return -ENOMEM;
395 doi_def->type = CIPSO_V4_MAP_LOCAL;
396
397 ret_val = netlbl_cipsov4_add_common(info, doi_def);
398 if (ret_val != 0)
399 goto add_local_failure;
400
6c2e8ac0 401 ret_val = cipso_v4_doi_add(doi_def, audit_info);
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402 if (ret_val != 0)
403 goto add_local_failure;
404 return 0;
405
406add_local_failure:
407 cipso_v4_doi_free(doi_def);
408 return ret_val;
409}
410
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411/**
412 * netlbl_cipsov4_add - Handle an ADD message
413 * @skb: the NETLINK buffer
414 * @info: the Generic NETLINK info block
415 *
416 * Description:
417 * Create a new DOI definition based on the given ADD message and add it to the
418 * CIPSO V4 engine. Returns zero on success, negative values on failure.
419 *
420 */
421static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
422
423{
424 int ret_val = -EINVAL;
95d4e6be 425 struct netlbl_audit audit_info;
96cb8e33 426
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427 if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
428 !info->attrs[NLBL_CIPSOV4_A_MTYPE])
fd385855 429 return -EINVAL;
96cb8e33 430
95d4e6be 431 netlbl_netlink_auditinfo(skb, &audit_info);
6c2e8ac0 432 switch (nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE])) {
15c45f7b 433 case CIPSO_V4_MAP_TRANS:
6c2e8ac0 434 ret_val = netlbl_cipsov4_add_std(info, &audit_info);
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435 break;
436 case CIPSO_V4_MAP_PASS:
6c2e8ac0 437 ret_val = netlbl_cipsov4_add_pass(info, &audit_info);
96cb8e33 438 break;
d91d4079 439 case CIPSO_V4_MAP_LOCAL:
6c2e8ac0 440 ret_val = netlbl_cipsov4_add_local(info, &audit_info);
d91d4079 441 break;
96cb8e33 442 }
23bcdc1a 443 if (ret_val == 0)
c783f1ce 444 atomic_inc(&netlabel_mgmt_protocount);
96cb8e33 445
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446 return ret_val;
447}
448
449/**
450 * netlbl_cipsov4_list - Handle a LIST message
451 * @skb: the NETLINK buffer
452 * @info: the Generic NETLINK info block
453 *
454 * Description:
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455 * Process a user generated LIST message and respond accordingly. While the
456 * response message generated by the kernel is straightforward, determining
457 * before hand the size of the buffer to allocate is not (we have to generate
458 * the message to know the size). In order to keep this function sane what we
459 * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
460 * that size, if we fail then we restart with a larger buffer and try again.
461 * We continue in this manner until we hit a limit of failed attempts then we
462 * give up and just send an error message. Returns zero on success and
463 * negative values on error.
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464 *
465 */
466static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
467{
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468 int ret_val;
469 struct sk_buff *ans_skb = NULL;
470 u32 nlsze_mult = 1;
471 void *data;
96cb8e33 472 u32 doi;
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473 struct nlattr *nla_a;
474 struct nlattr *nla_b;
475 struct cipso_v4_doi *doi_def;
476 u32 iter;
96cb8e33 477
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478 if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
479 ret_val = -EINVAL;
96cb8e33 480 goto list_failure;
fd385855 481 }
96cb8e33 482
fd385855 483list_start:
339bf98f 484 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL);
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485 if (ans_skb == NULL) {
486 ret_val = -ENOMEM;
487 goto list_failure;
488 }
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489 data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family,
490 0, NLBL_CIPSOV4_C_LIST);
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491 if (data == NULL) {
492 ret_val = -ENOMEM;
493 goto list_failure;
494 }
495
496 doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
497
498 rcu_read_lock();
499 doi_def = cipso_v4_doi_getdef(doi);
500 if (doi_def == NULL) {
501 ret_val = -EINVAL;
56196701 502 goto list_failure_lock;
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503 }
504
505 ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
506 if (ret_val != 0)
507 goto list_failure_lock;
508
509 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST);
510 if (nla_a == NULL) {
511 ret_val = -ENOMEM;
512 goto list_failure_lock;
513 }
514 for (iter = 0;
515 iter < CIPSO_V4_TAG_MAXCNT &&
516 doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
517 iter++) {
518 ret_val = nla_put_u8(ans_skb,
519 NLBL_CIPSOV4_A_TAG,
520 doi_def->tags[iter]);
521 if (ret_val != 0)
522 goto list_failure_lock;
523 }
524 nla_nest_end(ans_skb, nla_a);
525
526 switch (doi_def->type) {
15c45f7b 527 case CIPSO_V4_MAP_TRANS:
fd385855
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528 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
529 if (nla_a == NULL) {
530 ret_val = -ENOMEM;
531 goto list_failure_lock;
532 }
533 for (iter = 0;
534 iter < doi_def->map.std->lvl.local_size;
535 iter++) {
536 if (doi_def->map.std->lvl.local[iter] ==
537 CIPSO_V4_INV_LVL)
538 continue;
539
540 nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL);
541 if (nla_b == NULL) {
542 ret_val = -ENOMEM;
543 goto list_retry;
544 }
545 ret_val = nla_put_u32(ans_skb,
546 NLBL_CIPSOV4_A_MLSLVLLOC,
547 iter);
548 if (ret_val != 0)
549 goto list_retry;
550 ret_val = nla_put_u32(ans_skb,
551 NLBL_CIPSOV4_A_MLSLVLREM,
552 doi_def->map.std->lvl.local[iter]);
553 if (ret_val != 0)
554 goto list_retry;
555 nla_nest_end(ans_skb, nla_b);
556 }
557 nla_nest_end(ans_skb, nla_a);
558
559 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST);
560 if (nla_a == NULL) {
561 ret_val = -ENOMEM;
562 goto list_retry;
563 }
564 for (iter = 0;
565 iter < doi_def->map.std->cat.local_size;
566 iter++) {
567 if (doi_def->map.std->cat.local[iter] ==
568 CIPSO_V4_INV_CAT)
569 continue;
570
571 nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT);
572 if (nla_b == NULL) {
573 ret_val = -ENOMEM;
574 goto list_retry;
575 }
576 ret_val = nla_put_u32(ans_skb,
577 NLBL_CIPSOV4_A_MLSCATLOC,
578 iter);
579 if (ret_val != 0)
580 goto list_retry;
581 ret_val = nla_put_u32(ans_skb,
582 NLBL_CIPSOV4_A_MLSCATREM,
583 doi_def->map.std->cat.local[iter]);
584 if (ret_val != 0)
585 goto list_retry;
586 nla_nest_end(ans_skb, nla_b);
587 }
588 nla_nest_end(ans_skb, nla_a);
589
590 break;
591 }
592 rcu_read_unlock();
96cb8e33 593
fd385855 594 genlmsg_end(ans_skb, data);
fe785bee 595 return genlmsg_reply(ans_skb, info);
96cb8e33 596
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597list_retry:
598 /* XXX - this limit is a guesstimate */
599 if (nlsze_mult < 4) {
600 rcu_read_unlock();
601 kfree_skb(ans_skb);
83aa2e96 602 nlsze_mult *= 2;
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603 goto list_start;
604 }
605list_failure_lock:
606 rcu_read_unlock();
96cb8e33 607list_failure:
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608 kfree_skb(ans_skb);
609 return ret_val;
610}
611
612/**
613 * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
614 * @doi_def: the CIPSOv4 DOI definition
615 * @arg: the netlbl_cipsov4_doiwalk_arg structure
616 *
617 * Description:
618 * This function is designed to be used as a callback to the
619 * cipso_v4_doi_walk() function for use in generating a response for a LISTALL
620 * message. Returns the size of the message on success, negative values on
621 * failure.
622 *
623 */
624static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
625{
626 int ret_val = -ENOMEM;
627 struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
628 void *data;
629
15e47304 630 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
17c157c8
TG
631 cb_arg->seq, &netlbl_cipsov4_gnl_family,
632 NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL);
fd385855
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633 if (data == NULL)
634 goto listall_cb_failure;
635
636 ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
637 if (ret_val != 0)
638 goto listall_cb_failure;
639 ret_val = nla_put_u32(cb_arg->skb,
640 NLBL_CIPSOV4_A_MTYPE,
641 doi_def->type);
642 if (ret_val != 0)
643 goto listall_cb_failure;
644
645 return genlmsg_end(cb_arg->skb, data);
646
647listall_cb_failure:
648 genlmsg_cancel(cb_arg->skb, data);
96cb8e33
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649 return ret_val;
650}
651
652/**
653 * netlbl_cipsov4_listall - Handle a LISTALL message
654 * @skb: the NETLINK buffer
fd385855 655 * @cb: the NETLINK callback
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656 *
657 * Description:
658 * Process a user generated LISTALL message and respond accordingly. Returns
659 * zero on success and negative values on error.
660 *
661 */
fd385855
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662static int netlbl_cipsov4_listall(struct sk_buff *skb,
663 struct netlink_callback *cb)
96cb8e33 664{
fd385855 665 struct netlbl_cipsov4_doiwalk_arg cb_arg;
56196701 666 u32 doi_skip = cb->args[0];
96cb8e33 667
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668 cb_arg.nl_cb = cb;
669 cb_arg.skb = skb;
670 cb_arg.seq = cb->nlh->nlmsg_seq;
96cb8e33 671
fd385855 672 cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
96cb8e33 673
fd385855
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674 cb->args[0] = doi_skip;
675 return skb->len;
96cb8e33
PM
676}
677
b1edeb10
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678/**
679 * netlbl_cipsov4_remove_cb - netlbl_cipsov4_remove() callback for REMOVE
680 * @entry: LSM domain mapping entry
681 * @arg: the netlbl_domhsh_walk_arg structure
682 *
683 * Description:
684 * This function is intended for use by netlbl_cipsov4_remove() as the callback
685 * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
686 * which are associated with the CIPSO DOI specified in @arg. Returns zero on
687 * success, negative values on failure.
688 *
689 */
690static int netlbl_cipsov4_remove_cb(struct netlbl_dom_map *entry, void *arg)
691{
692 struct netlbl_domhsh_walk_arg *cb_arg = arg;
693
6a8b7f0c
PM
694 if (entry->def.type == NETLBL_NLTYPE_CIPSOV4 &&
695 entry->def.cipso->doi == cb_arg->doi)
b1edeb10
PM
696 return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
697
698 return 0;
699}
700
96cb8e33
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701/**
702 * netlbl_cipsov4_remove - Handle a REMOVE message
703 * @skb: the NETLINK buffer
704 * @info: the Generic NETLINK info block
705 *
706 * Description:
707 * Process a user generated REMOVE message and respond accordingly. Returns
708 * zero on success, negative values on failure.
709 *
710 */
711static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
712{
fd385855 713 int ret_val = -EINVAL;
b1edeb10 714 struct netlbl_domhsh_walk_arg cb_arg;
95d4e6be 715 struct netlbl_audit audit_info;
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716 u32 skip_bkt = 0;
717 u32 skip_chain = 0;
96cb8e33 718
95d4e6be
PM
719 if (!info->attrs[NLBL_CIPSOV4_A_DOI])
720 return -EINVAL;
32f50cde 721
95d4e6be 722 netlbl_netlink_auditinfo(skb, &audit_info);
6c2e8ac0 723 cb_arg.doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
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724 cb_arg.audit_info = &audit_info;
725 ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
726 netlbl_cipsov4_remove_cb, &cb_arg);
727 if (ret_val == 0 || ret_val == -ENOENT) {
6c2e8ac0 728 ret_val = cipso_v4_doi_remove(cb_arg.doi, &audit_info);
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729 if (ret_val == 0)
730 atomic_dec(&netlabel_mgmt_protocount);
731 }
95d4e6be 732
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733 return ret_val;
734}
735
736/*
737 * NetLabel Generic NETLINK Command Definitions
738 */
739
4534de83 740static const struct genl_ops netlbl_cipsov4_ops[] = {
227c43c3 741 {
96cb8e33 742 .cmd = NLBL_CIPSOV4_C_ADD,
fd385855
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743 .flags = GENL_ADMIN_PERM,
744 .policy = netlbl_cipsov4_genl_policy,
96cb8e33
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745 .doit = netlbl_cipsov4_add,
746 .dumpit = NULL,
227c43c3
PE
747 },
748 {
96cb8e33 749 .cmd = NLBL_CIPSOV4_C_REMOVE,
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750 .flags = GENL_ADMIN_PERM,
751 .policy = netlbl_cipsov4_genl_policy,
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752 .doit = netlbl_cipsov4_remove,
753 .dumpit = NULL,
227c43c3
PE
754 },
755 {
96cb8e33
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756 .cmd = NLBL_CIPSOV4_C_LIST,
757 .flags = 0,
fd385855 758 .policy = netlbl_cipsov4_genl_policy,
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759 .doit = netlbl_cipsov4_list,
760 .dumpit = NULL,
227c43c3
PE
761 },
762 {
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763 .cmd = NLBL_CIPSOV4_C_LISTALL,
764 .flags = 0,
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765 .policy = netlbl_cipsov4_genl_policy,
766 .doit = NULL,
767 .dumpit = netlbl_cipsov4_listall,
227c43c3 768 },
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769};
770
771/*
772 * NetLabel Generic NETLINK Protocol Functions
773 */
774
775/**
776 * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
777 *
778 * Description:
779 * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
780 * mechanism. Returns zero on success, negative values on failure.
781 *
782 */
05705e4e 783int __init netlbl_cipsov4_genl_init(void)
96cb8e33 784{
7ae740df
MM
785 return genl_register_family_with_ops(&netlbl_cipsov4_gnl_family,
786 netlbl_cipsov4_ops, ARRAY_SIZE(netlbl_cipsov4_ops));
96cb8e33 787}