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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() */ |
46 | struct 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 */ |
53 | static 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 */ |
62 | static 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 | */ | |
91 | static 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 | */ | |
117 | static 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 | 157 | static 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 | ||
326 | add_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 | 342 | static 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 | ||
364 | add_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 | */ | |
379 | static 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); | |
410 | audit_log_format(audit_buf, | |
411 | " cipso_doi=%u cipso_type=%s res=%u", | |
412 | doi, | |
413 | type_str, | |
414 | ret_val == 0 ? 1 : 0); | |
415 | audit_log_end(audit_buf); | |
32f50cde | 416 | |
96cb8e33 PM |
417 | return ret_val; |
418 | } | |
419 | ||
420 | /** | |
421 | * netlbl_cipsov4_list - Handle a LIST message | |
422 | * @skb: the NETLINK buffer | |
423 | * @info: the Generic NETLINK info block | |
424 | * | |
425 | * Description: | |
fd385855 PM |
426 | * Process a user generated LIST message and respond accordingly. While the |
427 | * response message generated by the kernel is straightforward, determining | |
428 | * before hand the size of the buffer to allocate is not (we have to generate | |
429 | * the message to know the size). In order to keep this function sane what we | |
430 | * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in | |
431 | * that size, if we fail then we restart with a larger buffer and try again. | |
432 | * We continue in this manner until we hit a limit of failed attempts then we | |
433 | * give up and just send an error message. Returns zero on success and | |
434 | * negative values on error. | |
96cb8e33 PM |
435 | * |
436 | */ | |
437 | static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info) | |
438 | { | |
fd385855 PM |
439 | int ret_val; |
440 | struct sk_buff *ans_skb = NULL; | |
441 | u32 nlsze_mult = 1; | |
442 | void *data; | |
96cb8e33 | 443 | u32 doi; |
fd385855 PM |
444 | struct nlattr *nla_a; |
445 | struct nlattr *nla_b; | |
446 | struct cipso_v4_doi *doi_def; | |
447 | u32 iter; | |
96cb8e33 | 448 | |
fd385855 PM |
449 | if (!info->attrs[NLBL_CIPSOV4_A_DOI]) { |
450 | ret_val = -EINVAL; | |
96cb8e33 | 451 | goto list_failure; |
fd385855 | 452 | } |
96cb8e33 | 453 | |
fd385855 PM |
454 | list_start: |
455 | ans_skb = nlmsg_new(NLMSG_GOODSIZE * nlsze_mult, GFP_KERNEL); | |
96cb8e33 PM |
456 | if (ans_skb == NULL) { |
457 | ret_val = -ENOMEM; | |
458 | goto list_failure; | |
459 | } | |
fd385855 PM |
460 | data = netlbl_netlink_hdr_put(ans_skb, |
461 | info->snd_pid, | |
462 | info->snd_seq, | |
463 | netlbl_cipsov4_gnl_family.id, | |
464 | 0, | |
465 | NLBL_CIPSOV4_C_LIST); | |
466 | if (data == NULL) { | |
467 | ret_val = -ENOMEM; | |
468 | goto list_failure; | |
469 | } | |
470 | ||
471 | doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]); | |
472 | ||
473 | rcu_read_lock(); | |
474 | doi_def = cipso_v4_doi_getdef(doi); | |
475 | if (doi_def == NULL) { | |
476 | ret_val = -EINVAL; | |
477 | goto list_failure; | |
478 | } | |
479 | ||
480 | ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type); | |
481 | if (ret_val != 0) | |
482 | goto list_failure_lock; | |
483 | ||
484 | nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST); | |
485 | if (nla_a == NULL) { | |
486 | ret_val = -ENOMEM; | |
487 | goto list_failure_lock; | |
488 | } | |
489 | for (iter = 0; | |
490 | iter < CIPSO_V4_TAG_MAXCNT && | |
491 | doi_def->tags[iter] != CIPSO_V4_TAG_INVALID; | |
492 | iter++) { | |
493 | ret_val = nla_put_u8(ans_skb, | |
494 | NLBL_CIPSOV4_A_TAG, | |
495 | doi_def->tags[iter]); | |
496 | if (ret_val != 0) | |
497 | goto list_failure_lock; | |
498 | } | |
499 | nla_nest_end(ans_skb, nla_a); | |
500 | ||
501 | switch (doi_def->type) { | |
502 | case CIPSO_V4_MAP_STD: | |
503 | nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST); | |
504 | if (nla_a == NULL) { | |
505 | ret_val = -ENOMEM; | |
506 | goto list_failure_lock; | |
507 | } | |
508 | for (iter = 0; | |
509 | iter < doi_def->map.std->lvl.local_size; | |
510 | iter++) { | |
511 | if (doi_def->map.std->lvl.local[iter] == | |
512 | CIPSO_V4_INV_LVL) | |
513 | continue; | |
514 | ||
515 | nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL); | |
516 | if (nla_b == NULL) { | |
517 | ret_val = -ENOMEM; | |
518 | goto list_retry; | |
519 | } | |
520 | ret_val = nla_put_u32(ans_skb, | |
521 | NLBL_CIPSOV4_A_MLSLVLLOC, | |
522 | iter); | |
523 | if (ret_val != 0) | |
524 | goto list_retry; | |
525 | ret_val = nla_put_u32(ans_skb, | |
526 | NLBL_CIPSOV4_A_MLSLVLREM, | |
527 | doi_def->map.std->lvl.local[iter]); | |
528 | if (ret_val != 0) | |
529 | goto list_retry; | |
530 | nla_nest_end(ans_skb, nla_b); | |
531 | } | |
532 | nla_nest_end(ans_skb, nla_a); | |
533 | ||
534 | nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST); | |
535 | if (nla_a == NULL) { | |
536 | ret_val = -ENOMEM; | |
537 | goto list_retry; | |
538 | } | |
539 | for (iter = 0; | |
540 | iter < doi_def->map.std->cat.local_size; | |
541 | iter++) { | |
542 | if (doi_def->map.std->cat.local[iter] == | |
543 | CIPSO_V4_INV_CAT) | |
544 | continue; | |
545 | ||
546 | nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT); | |
547 | if (nla_b == NULL) { | |
548 | ret_val = -ENOMEM; | |
549 | goto list_retry; | |
550 | } | |
551 | ret_val = nla_put_u32(ans_skb, | |
552 | NLBL_CIPSOV4_A_MLSCATLOC, | |
553 | iter); | |
554 | if (ret_val != 0) | |
555 | goto list_retry; | |
556 | ret_val = nla_put_u32(ans_skb, | |
557 | NLBL_CIPSOV4_A_MLSCATREM, | |
558 | doi_def->map.std->cat.local[iter]); | |
559 | if (ret_val != 0) | |
560 | goto list_retry; | |
561 | nla_nest_end(ans_skb, nla_b); | |
562 | } | |
563 | nla_nest_end(ans_skb, nla_a); | |
564 | ||
565 | break; | |
566 | } | |
567 | rcu_read_unlock(); | |
96cb8e33 | 568 | |
fd385855 PM |
569 | genlmsg_end(ans_skb, data); |
570 | ||
571 | ret_val = genlmsg_unicast(ans_skb, info->snd_pid); | |
96cb8e33 PM |
572 | if (ret_val != 0) |
573 | goto list_failure; | |
574 | ||
575 | return 0; | |
576 | ||
fd385855 PM |
577 | list_retry: |
578 | /* XXX - this limit is a guesstimate */ | |
579 | if (nlsze_mult < 4) { | |
580 | rcu_read_unlock(); | |
581 | kfree_skb(ans_skb); | |
582 | nlsze_mult++; | |
583 | goto list_start; | |
584 | } | |
585 | list_failure_lock: | |
586 | rcu_read_unlock(); | |
96cb8e33 | 587 | list_failure: |
fd385855 PM |
588 | kfree_skb(ans_skb); |
589 | return ret_val; | |
590 | } | |
591 | ||
592 | /** | |
593 | * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL | |
594 | * @doi_def: the CIPSOv4 DOI definition | |
595 | * @arg: the netlbl_cipsov4_doiwalk_arg structure | |
596 | * | |
597 | * Description: | |
598 | * This function is designed to be used as a callback to the | |
599 | * cipso_v4_doi_walk() function for use in generating a response for a LISTALL | |
600 | * message. Returns the size of the message on success, negative values on | |
601 | * failure. | |
602 | * | |
603 | */ | |
604 | static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg) | |
605 | { | |
606 | int ret_val = -ENOMEM; | |
607 | struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg; | |
608 | void *data; | |
609 | ||
610 | data = netlbl_netlink_hdr_put(cb_arg->skb, | |
611 | NETLINK_CB(cb_arg->nl_cb->skb).pid, | |
612 | cb_arg->seq, | |
613 | netlbl_cipsov4_gnl_family.id, | |
614 | NLM_F_MULTI, | |
615 | NLBL_CIPSOV4_C_LISTALL); | |
616 | if (data == NULL) | |
617 | goto listall_cb_failure; | |
618 | ||
619 | ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi); | |
620 | if (ret_val != 0) | |
621 | goto listall_cb_failure; | |
622 | ret_val = nla_put_u32(cb_arg->skb, | |
623 | NLBL_CIPSOV4_A_MTYPE, | |
624 | doi_def->type); | |
625 | if (ret_val != 0) | |
626 | goto listall_cb_failure; | |
627 | ||
628 | return genlmsg_end(cb_arg->skb, data); | |
629 | ||
630 | listall_cb_failure: | |
631 | genlmsg_cancel(cb_arg->skb, data); | |
96cb8e33 PM |
632 | return ret_val; |
633 | } | |
634 | ||
635 | /** | |
636 | * netlbl_cipsov4_listall - Handle a LISTALL message | |
637 | * @skb: the NETLINK buffer | |
fd385855 | 638 | * @cb: the NETLINK callback |
96cb8e33 PM |
639 | * |
640 | * Description: | |
641 | * Process a user generated LISTALL message and respond accordingly. Returns | |
642 | * zero on success and negative values on error. | |
643 | * | |
644 | */ | |
fd385855 PM |
645 | static int netlbl_cipsov4_listall(struct sk_buff *skb, |
646 | struct netlink_callback *cb) | |
96cb8e33 | 647 | { |
fd385855 PM |
648 | struct netlbl_cipsov4_doiwalk_arg cb_arg; |
649 | int doi_skip = cb->args[0]; | |
96cb8e33 | 650 | |
fd385855 PM |
651 | cb_arg.nl_cb = cb; |
652 | cb_arg.skb = skb; | |
653 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
96cb8e33 | 654 | |
fd385855 | 655 | cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg); |
96cb8e33 | 656 | |
fd385855 PM |
657 | cb->args[0] = doi_skip; |
658 | return skb->len; | |
96cb8e33 PM |
659 | } |
660 | ||
661 | /** | |
662 | * netlbl_cipsov4_remove - Handle a REMOVE message | |
663 | * @skb: the NETLINK buffer | |
664 | * @info: the Generic NETLINK info block | |
665 | * | |
666 | * Description: | |
667 | * Process a user generated REMOVE message and respond accordingly. Returns | |
668 | * zero on success, negative values on failure. | |
669 | * | |
670 | */ | |
671 | static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info) | |
672 | { | |
fd385855 | 673 | int ret_val = -EINVAL; |
32f50cde PM |
674 | u32 doi = 0; |
675 | struct audit_buffer *audit_buf; | |
95d4e6be | 676 | struct netlbl_audit audit_info; |
96cb8e33 | 677 | |
95d4e6be PM |
678 | if (!info->attrs[NLBL_CIPSOV4_A_DOI]) |
679 | return -EINVAL; | |
32f50cde | 680 | |
95d4e6be PM |
681 | doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]); |
682 | netlbl_netlink_auditinfo(skb, &audit_info); | |
683 | ||
684 | ret_val = cipso_v4_doi_remove(doi, | |
685 | &audit_info, | |
686 | netlbl_cipsov4_doi_free); | |
687 | ||
688 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL, | |
689 | &audit_info); | |
690 | audit_log_format(audit_buf, | |
691 | " cipso_doi=%u res=%u", | |
692 | doi, | |
693 | ret_val == 0 ? 1 : 0); | |
694 | audit_log_end(audit_buf); | |
96cb8e33 | 695 | |
96cb8e33 PM |
696 | return ret_val; |
697 | } | |
698 | ||
699 | /* | |
700 | * NetLabel Generic NETLINK Command Definitions | |
701 | */ | |
702 | ||
703 | static struct genl_ops netlbl_cipsov4_genl_c_add = { | |
704 | .cmd = NLBL_CIPSOV4_C_ADD, | |
fd385855 PM |
705 | .flags = GENL_ADMIN_PERM, |
706 | .policy = netlbl_cipsov4_genl_policy, | |
96cb8e33 PM |
707 | .doit = netlbl_cipsov4_add, |
708 | .dumpit = NULL, | |
709 | }; | |
710 | ||
711 | static struct genl_ops netlbl_cipsov4_genl_c_remove = { | |
712 | .cmd = NLBL_CIPSOV4_C_REMOVE, | |
fd385855 PM |
713 | .flags = GENL_ADMIN_PERM, |
714 | .policy = netlbl_cipsov4_genl_policy, | |
96cb8e33 PM |
715 | .doit = netlbl_cipsov4_remove, |
716 | .dumpit = NULL, | |
717 | }; | |
718 | ||
719 | static struct genl_ops netlbl_cipsov4_genl_c_list = { | |
720 | .cmd = NLBL_CIPSOV4_C_LIST, | |
721 | .flags = 0, | |
fd385855 | 722 | .policy = netlbl_cipsov4_genl_policy, |
96cb8e33 PM |
723 | .doit = netlbl_cipsov4_list, |
724 | .dumpit = NULL, | |
725 | }; | |
726 | ||
727 | static struct genl_ops netlbl_cipsov4_genl_c_listall = { | |
728 | .cmd = NLBL_CIPSOV4_C_LISTALL, | |
729 | .flags = 0, | |
fd385855 PM |
730 | .policy = netlbl_cipsov4_genl_policy, |
731 | .doit = NULL, | |
732 | .dumpit = netlbl_cipsov4_listall, | |
96cb8e33 PM |
733 | }; |
734 | ||
735 | /* | |
736 | * NetLabel Generic NETLINK Protocol Functions | |
737 | */ | |
738 | ||
739 | /** | |
740 | * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component | |
741 | * | |
742 | * Description: | |
743 | * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK | |
744 | * mechanism. Returns zero on success, negative values on failure. | |
745 | * | |
746 | */ | |
747 | int netlbl_cipsov4_genl_init(void) | |
748 | { | |
749 | int ret_val; | |
750 | ||
751 | ret_val = genl_register_family(&netlbl_cipsov4_gnl_family); | |
752 | if (ret_val != 0) | |
753 | return ret_val; | |
754 | ||
755 | ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family, | |
756 | &netlbl_cipsov4_genl_c_add); | |
757 | if (ret_val != 0) | |
758 | return ret_val; | |
759 | ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family, | |
760 | &netlbl_cipsov4_genl_c_remove); | |
761 | if (ret_val != 0) | |
762 | return ret_val; | |
763 | ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family, | |
764 | &netlbl_cipsov4_genl_c_list); | |
765 | if (ret_val != 0) | |
766 | return ret_val; | |
767 | ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family, | |
768 | &netlbl_cipsov4_genl_c_listall); | |
769 | if (ret_val != 0) | |
770 | return ret_val; | |
771 | ||
772 | return 0; | |
773 | } |