2 * NetLabel CIPSO/IPv4 Support
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.
8 * Author: Paul Moore <paul.moore@hp.com>
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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.
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.
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
31 #include <linux/types.h>
32 #include <linux/socket.h>
33 #include <linux/string.h>
34 #include <linux/skbuff.h>
36 #include <net/netlink.h>
37 #include <net/genetlink.h>
38 #include <net/netlabel.h>
39 #include <net/cipso_ipv4.h>
41 #include "netlabel_user.h"
42 #include "netlabel_cipso_v4.h"
44 /* NetLabel Generic NETLINK CIPSOv4 family */
45 static struct genl_family netlbl_cipsov4_gnl_family = {
46 .id = GENL_ID_GENERATE,
48 .name = NETLBL_NLTYPE_CIPSOV4_NAME,
49 .version = NETLBL_PROTO_VERSION,
59 * netlbl_cipsov4_doi_free - Frees a CIPSO V4 DOI definition
60 * @entry: the entry's RCU field
63 * This function is designed to be used as a callback to the call_rcu()
64 * function so that the memory allocated to the DOI definition can be released
68 static void netlbl_cipsov4_doi_free(struct rcu_head *entry)
70 struct cipso_v4_doi *ptr;
72 ptr = container_of(entry, struct cipso_v4_doi, rcu);
74 case CIPSO_V4_MAP_STD:
75 kfree(ptr->map.std->lvl.cipso);
76 kfree(ptr->map.std->lvl.local);
77 kfree(ptr->map.std->cat.cipso);
78 kfree(ptr->map.std->cat.local);
86 * NetLabel Command Handlers
90 * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
92 * @msg: the ADD message data
93 * @msg_size: the size of the ADD message buffer
96 * Create a new CIPSO_V4_MAP_STD DOI definition based on the given ADD message
97 * and add it to the CIPSO V4 engine. Return zero on success and non-zero on
101 static int netlbl_cipsov4_add_std(u32 doi, struct nlattr *msg, size_t msg_size)
103 int ret_val = -EINVAL;
104 int msg_len = msg_size;
108 struct cipso_v4_doi *doi_def = NULL;
113 if (msg_len < NETLBL_LEN_U32)
114 goto add_std_failure;
115 num_tags = netlbl_getinc_u32(&msg, &msg_len);
116 if (num_tags == 0 || num_tags > CIPSO_V4_TAG_MAXCNT)
117 goto add_std_failure;
119 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
120 if (doi_def == NULL) {
122 goto add_std_failure;
124 doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
125 if (doi_def->map.std == NULL) {
127 goto add_std_failure;
129 doi_def->type = CIPSO_V4_MAP_STD;
131 for (iter = 0; iter < num_tags; iter++) {
132 if (msg_len < NETLBL_LEN_U8)
133 goto add_std_failure;
134 doi_def->tags[iter] = netlbl_getinc_u8(&msg, &msg_len);
135 switch (doi_def->tags[iter]) {
136 case CIPSO_V4_TAG_RBITMAP:
139 goto add_std_failure;
142 if (iter < CIPSO_V4_TAG_MAXCNT)
143 doi_def->tags[iter] = CIPSO_V4_TAG_INVALID;
145 if (msg_len < 6 * NETLBL_LEN_U32)
146 goto add_std_failure;
148 num_lvls = netlbl_getinc_u32(&msg, &msg_len);
150 goto add_std_failure;
151 doi_def->map.std->lvl.local_size = netlbl_getinc_u32(&msg, &msg_len);
152 if (doi_def->map.std->lvl.local_size > CIPSO_V4_MAX_LOC_LVLS)
153 goto add_std_failure;
154 doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
157 if (doi_def->map.std->lvl.local == NULL) {
159 goto add_std_failure;
161 doi_def->map.std->lvl.cipso_size = netlbl_getinc_u8(&msg, &msg_len);
162 if (doi_def->map.std->lvl.cipso_size > CIPSO_V4_MAX_REM_LVLS)
163 goto add_std_failure;
164 doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
167 if (doi_def->map.std->lvl.cipso == NULL) {
169 goto add_std_failure;
172 num_cats = netlbl_getinc_u32(&msg, &msg_len);
173 doi_def->map.std->cat.local_size = netlbl_getinc_u32(&msg, &msg_len);
174 if (doi_def->map.std->cat.local_size > CIPSO_V4_MAX_LOC_CATS)
175 goto add_std_failure;
176 doi_def->map.std->cat.local = kcalloc(doi_def->map.std->cat.local_size,
179 if (doi_def->map.std->cat.local == NULL) {
181 goto add_std_failure;
183 doi_def->map.std->cat.cipso_size = netlbl_getinc_u16(&msg, &msg_len);
184 if (doi_def->map.std->cat.cipso_size > CIPSO_V4_MAX_REM_CATS)
185 goto add_std_failure;
186 doi_def->map.std->cat.cipso = kcalloc(doi_def->map.std->cat.cipso_size,
189 if (doi_def->map.std->cat.cipso == NULL) {
191 goto add_std_failure;
195 num_lvls * (NETLBL_LEN_U32 + NETLBL_LEN_U8) +
196 num_cats * (NETLBL_LEN_U32 + NETLBL_LEN_U16))
197 goto add_std_failure;
199 for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++)
200 doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL;
201 for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++)
202 doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL;
203 for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++)
204 doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT;
205 for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++)
206 doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT;
208 for (iter = 0; iter < num_lvls; iter++) {
209 tmp_val_a = netlbl_getinc_u32(&msg, &msg_len);
210 tmp_val_b = netlbl_getinc_u8(&msg, &msg_len);
212 if (tmp_val_a >= doi_def->map.std->lvl.local_size ||
213 tmp_val_b >= doi_def->map.std->lvl.cipso_size)
214 goto add_std_failure;
216 doi_def->map.std->lvl.cipso[tmp_val_b] = tmp_val_a;
217 doi_def->map.std->lvl.local[tmp_val_a] = tmp_val_b;
220 for (iter = 0; iter < num_cats; iter++) {
221 tmp_val_a = netlbl_getinc_u32(&msg, &msg_len);
222 tmp_val_b = netlbl_getinc_u16(&msg, &msg_len);
224 if (tmp_val_a >= doi_def->map.std->cat.local_size ||
225 tmp_val_b >= doi_def->map.std->cat.cipso_size)
226 goto add_std_failure;
228 doi_def->map.std->cat.cipso[tmp_val_b] = tmp_val_a;
229 doi_def->map.std->cat.local[tmp_val_a] = tmp_val_b;
233 ret_val = cipso_v4_doi_add(doi_def);
235 goto add_std_failure;
240 netlbl_cipsov4_doi_free(&doi_def->rcu);
245 * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
246 * @doi: the DOI value
247 * @msg: the ADD message data
248 * @msg_size: the size of the ADD message buffer
251 * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
252 * and add it to the CIPSO V4 engine. Return zero on success and non-zero on
256 static int netlbl_cipsov4_add_pass(u32 doi,
260 int ret_val = -EINVAL;
261 int msg_len = msg_size;
263 struct cipso_v4_doi *doi_def = NULL;
266 if (msg_len < NETLBL_LEN_U32)
267 goto add_pass_failure;
268 num_tags = netlbl_getinc_u32(&msg, &msg_len);
269 if (num_tags == 0 || num_tags > CIPSO_V4_TAG_MAXCNT)
270 goto add_pass_failure;
272 doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
273 if (doi_def == NULL) {
275 goto add_pass_failure;
277 doi_def->type = CIPSO_V4_MAP_PASS;
279 for (iter = 0; iter < num_tags; iter++) {
280 if (msg_len < NETLBL_LEN_U8)
281 goto add_pass_failure;
282 doi_def->tags[iter] = netlbl_getinc_u8(&msg, &msg_len);
283 switch (doi_def->tags[iter]) {
284 case CIPSO_V4_TAG_RBITMAP:
287 goto add_pass_failure;
290 if (iter < CIPSO_V4_TAG_MAXCNT)
291 doi_def->tags[iter] = CIPSO_V4_TAG_INVALID;
294 ret_val = cipso_v4_doi_add(doi_def);
296 goto add_pass_failure;
301 netlbl_cipsov4_doi_free(&doi_def->rcu);
306 * netlbl_cipsov4_add - Handle an ADD message
307 * @skb: the NETLINK buffer
308 * @info: the Generic NETLINK info block
311 * Create a new DOI definition based on the given ADD message and add it to the
312 * CIPSO V4 engine. Returns zero on success, negative values on failure.
315 static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
318 int ret_val = -EINVAL;
321 int msg_len = netlbl_netlink_payload_len(skb);
322 struct nlattr *msg = netlbl_netlink_payload_data(skb);
324 ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
328 if (msg_len < 2 * NETLBL_LEN_U32)
331 doi = netlbl_getinc_u32(&msg, &msg_len);
332 map_type = netlbl_getinc_u32(&msg, &msg_len);
334 case CIPSO_V4_MAP_STD:
335 ret_val = netlbl_cipsov4_add_std(doi, msg, msg_len);
337 case CIPSO_V4_MAP_PASS:
338 ret_val = netlbl_cipsov4_add_pass(doi, msg, msg_len);
343 netlbl_netlink_send_ack(info,
344 netlbl_cipsov4_gnl_family.id,
351 * netlbl_cipsov4_list - Handle a LIST message
352 * @skb: the NETLINK buffer
353 * @info: the Generic NETLINK info block
356 * Process a user generated LIST message and respond accordingly. Returns
357 * zero on success and negative values on error.
360 static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
362 int ret_val = -EINVAL;
364 struct nlattr *msg = netlbl_netlink_payload_data(skb);
365 struct sk_buff *ans_skb;
367 if (netlbl_netlink_payload_len(skb) != NETLBL_LEN_U32)
370 doi = nla_get_u32(msg);
371 ans_skb = cipso_v4_doi_dump(doi, NLMSG_SPACE(GENL_HDRLEN));
372 if (ans_skb == NULL) {
376 netlbl_netlink_hdr_push(ans_skb,
379 netlbl_cipsov4_gnl_family.id,
380 NLBL_CIPSOV4_C_LIST);
382 ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
389 netlbl_netlink_send_ack(info,
390 netlbl_cipsov4_gnl_family.id,
397 * netlbl_cipsov4_listall - Handle a LISTALL message
398 * @skb: the NETLINK buffer
399 * @info: the Generic NETLINK info block
402 * Process a user generated LISTALL message and respond accordingly. Returns
403 * zero on success and negative values on error.
406 static int netlbl_cipsov4_listall(struct sk_buff *skb, struct genl_info *info)
408 int ret_val = -EINVAL;
409 struct sk_buff *ans_skb;
411 ans_skb = cipso_v4_doi_dump_all(NLMSG_SPACE(GENL_HDRLEN));
412 if (ans_skb == NULL) {
414 goto listall_failure;
416 netlbl_netlink_hdr_push(ans_skb,
419 netlbl_cipsov4_gnl_family.id,
420 NLBL_CIPSOV4_C_LISTALL);
422 ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
424 goto listall_failure;
429 netlbl_netlink_send_ack(info,
430 netlbl_cipsov4_gnl_family.id,
437 * netlbl_cipsov4_remove - Handle a REMOVE message
438 * @skb: the NETLINK buffer
439 * @info: the Generic NETLINK info block
442 * Process a user generated REMOVE message and respond accordingly. Returns
443 * zero on success, negative values on failure.
446 static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
450 struct nlattr *msg = netlbl_netlink_payload_data(skb);
452 ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
456 if (netlbl_netlink_payload_len(skb) != NETLBL_LEN_U32) {
461 doi = nla_get_u32(msg);
462 ret_val = cipso_v4_doi_remove(doi, netlbl_cipsov4_doi_free);
465 netlbl_netlink_send_ack(info,
466 netlbl_cipsov4_gnl_family.id,
473 * NetLabel Generic NETLINK Command Definitions
476 static struct genl_ops netlbl_cipsov4_genl_c_add = {
477 .cmd = NLBL_CIPSOV4_C_ADD,
479 .doit = netlbl_cipsov4_add,
483 static struct genl_ops netlbl_cipsov4_genl_c_remove = {
484 .cmd = NLBL_CIPSOV4_C_REMOVE,
486 .doit = netlbl_cipsov4_remove,
490 static struct genl_ops netlbl_cipsov4_genl_c_list = {
491 .cmd = NLBL_CIPSOV4_C_LIST,
493 .doit = netlbl_cipsov4_list,
497 static struct genl_ops netlbl_cipsov4_genl_c_listall = {
498 .cmd = NLBL_CIPSOV4_C_LISTALL,
500 .doit = netlbl_cipsov4_listall,
505 * NetLabel Generic NETLINK Protocol Functions
509 * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
512 * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
513 * mechanism. Returns zero on success, negative values on failure.
516 int netlbl_cipsov4_genl_init(void)
520 ret_val = genl_register_family(&netlbl_cipsov4_gnl_family);
524 ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
525 &netlbl_cipsov4_genl_c_add);
528 ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
529 &netlbl_cipsov4_genl_c_remove);
532 ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
533 &netlbl_cipsov4_genl_c_list);
536 ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
537 &netlbl_cipsov4_genl_c_listall);