Loading...
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * CIPSO - Commercial IP Security Option
4 *
5 * This is an implementation of the CIPSO 2.2 protocol as specified in
6 * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
7 * FIPS-188, copies of both documents can be found in the Documentation
8 * directory. While CIPSO never became a full IETF RFC standard many vendors
9 * have chosen to adopt the protocol and over the years it has become a
10 * de-facto standard for labeled networking.
11 *
12 * Author: Paul Moore <paul@paul-moore.com>
13 */
14
15/*
16 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
17 */
18
19#ifndef _CIPSO_IPV4_H
20#define _CIPSO_IPV4_H
21
22#include <linux/types.h>
23#include <linux/rcupdate.h>
24#include <linux/list.h>
25#include <linux/net.h>
26#include <linux/skbuff.h>
27#include <net/netlabel.h>
28#include <net/request_sock.h>
29#include <linux/atomic.h>
30#include <linux/refcount.h>
31#include <asm/unaligned.h>
32
33/* known doi values */
34#define CIPSO_V4_DOI_UNKNOWN 0x00000000
35
36/* standard tag types */
37#define CIPSO_V4_TAG_INVALID 0
38#define CIPSO_V4_TAG_RBITMAP 1
39#define CIPSO_V4_TAG_ENUM 2
40#define CIPSO_V4_TAG_RANGE 5
41#define CIPSO_V4_TAG_PBITMAP 6
42#define CIPSO_V4_TAG_FREEFORM 7
43
44/* non-standard tag types (tags > 127) */
45#define CIPSO_V4_TAG_LOCAL 128
46
47/* doi mapping types */
48#define CIPSO_V4_MAP_UNKNOWN 0
49#define CIPSO_V4_MAP_TRANS 1
50#define CIPSO_V4_MAP_PASS 2
51#define CIPSO_V4_MAP_LOCAL 3
52
53/* limits */
54#define CIPSO_V4_MAX_REM_LVLS 255
55#define CIPSO_V4_INV_LVL 0x80000000
56#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
57#define CIPSO_V4_MAX_REM_CATS 65534
58#define CIPSO_V4_INV_CAT 0x80000000
59#define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)
60
61/*
62 * CIPSO DOI definitions
63 */
64
65/* DOI definition struct */
66#define CIPSO_V4_TAG_MAXCNT 5
67struct cipso_v4_doi {
68 u32 doi;
69 u32 type;
70 union {
71 struct cipso_v4_std_map_tbl *std;
72 } map;
73 u8 tags[CIPSO_V4_TAG_MAXCNT];
74
75 refcount_t refcount;
76 struct list_head list;
77 struct rcu_head rcu;
78};
79
80/* Standard CIPSO mapping table */
81/* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
82 * bit is set then consider that value as unspecified, meaning the
83 * mapping for that particular level/category is invalid */
84struct cipso_v4_std_map_tbl {
85 struct {
86 u32 *cipso;
87 u32 *local;
88 u32 cipso_size;
89 u32 local_size;
90 } lvl;
91 struct {
92 u32 *cipso;
93 u32 *local;
94 u32 cipso_size;
95 u32 local_size;
96 } cat;
97};
98
99/*
100 * Sysctl Variables
101 */
102
103#ifdef CONFIG_NETLABEL
104extern int cipso_v4_cache_enabled;
105extern int cipso_v4_cache_bucketsize;
106extern int cipso_v4_rbm_optfmt;
107extern int cipso_v4_rbm_strictvalid;
108#endif
109
110/*
111 * DOI List Functions
112 */
113
114#ifdef CONFIG_NETLABEL
115int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
116 struct netlbl_audit *audit_info);
117void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
118int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
119struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
120void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
121int cipso_v4_doi_walk(u32 *skip_cnt,
122 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
123 void *cb_arg);
124#else
125static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
126 struct netlbl_audit *audit_info)
127{
128 return -ENOSYS;
129}
130
131static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
132{
133 return;
134}
135
136static inline int cipso_v4_doi_remove(u32 doi,
137 struct netlbl_audit *audit_info)
138{
139 return 0;
140}
141
142static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
143{
144 return NULL;
145}
146
147static inline int cipso_v4_doi_walk(u32 *skip_cnt,
148 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
149 void *cb_arg)
150{
151 return 0;
152}
153
154static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
155 const char *domain)
156{
157 return -ENOSYS;
158}
159
160static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
161 const char *domain)
162{
163 return 0;
164}
165#endif /* CONFIG_NETLABEL */
166
167/*
168 * Label Mapping Cache Functions
169 */
170
171#ifdef CONFIG_NETLABEL
172void cipso_v4_cache_invalidate(void);
173int cipso_v4_cache_add(const unsigned char *cipso_ptr,
174 const struct netlbl_lsm_secattr *secattr);
175#else
176static inline void cipso_v4_cache_invalidate(void)
177{
178 return;
179}
180
181static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
182 const struct netlbl_lsm_secattr *secattr)
183{
184 return 0;
185}
186#endif /* CONFIG_NETLABEL */
187
188/*
189 * Protocol Handling Functions
190 */
191
192#ifdef CONFIG_NETLABEL
193void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
194int cipso_v4_getattr(const unsigned char *cipso,
195 struct netlbl_lsm_secattr *secattr);
196int cipso_v4_sock_setattr(struct sock *sk,
197 const struct cipso_v4_doi *doi_def,
198 const struct netlbl_lsm_secattr *secattr);
199void cipso_v4_sock_delattr(struct sock *sk);
200int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
201int cipso_v4_req_setattr(struct request_sock *req,
202 const struct cipso_v4_doi *doi_def,
203 const struct netlbl_lsm_secattr *secattr);
204void cipso_v4_req_delattr(struct request_sock *req);
205int cipso_v4_skbuff_setattr(struct sk_buff *skb,
206 const struct cipso_v4_doi *doi_def,
207 const struct netlbl_lsm_secattr *secattr);
208int cipso_v4_skbuff_delattr(struct sk_buff *skb);
209int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
210 struct netlbl_lsm_secattr *secattr);
211unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
212int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
213#else
214static inline void cipso_v4_error(struct sk_buff *skb,
215 int error,
216 u32 gateway)
217{
218 return;
219}
220
221static inline int cipso_v4_getattr(const unsigned char *cipso,
222 struct netlbl_lsm_secattr *secattr)
223{
224 return -ENOSYS;
225}
226
227static inline int cipso_v4_sock_setattr(struct sock *sk,
228 const struct cipso_v4_doi *doi_def,
229 const struct netlbl_lsm_secattr *secattr)
230{
231 return -ENOSYS;
232}
233
234static inline void cipso_v4_sock_delattr(struct sock *sk)
235{
236}
237
238static inline int cipso_v4_sock_getattr(struct sock *sk,
239 struct netlbl_lsm_secattr *secattr)
240{
241 return -ENOSYS;
242}
243
244static inline int cipso_v4_req_setattr(struct request_sock *req,
245 const struct cipso_v4_doi *doi_def,
246 const struct netlbl_lsm_secattr *secattr)
247{
248 return -ENOSYS;
249}
250
251static inline void cipso_v4_req_delattr(struct request_sock *req)
252{
253 return;
254}
255
256static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
257 const struct cipso_v4_doi *doi_def,
258 const struct netlbl_lsm_secattr *secattr)
259{
260 return -ENOSYS;
261}
262
263static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
264{
265 return -ENOSYS;
266}
267
268static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
269 struct netlbl_lsm_secattr *secattr)
270{
271 return -ENOSYS;
272}
273
274static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
275{
276 return NULL;
277}
278
279static inline int cipso_v4_validate(const struct sk_buff *skb,
280 unsigned char **option)
281{
282 unsigned char *opt = *option;
283 unsigned char err_offset = 0;
284 u8 opt_len = opt[1];
285 u8 opt_iter;
286 u8 tag_len;
287
288 if (opt_len < 8) {
289 err_offset = 1;
290 goto out;
291 }
292
293 if (get_unaligned_be32(&opt[2]) == 0) {
294 err_offset = 2;
295 goto out;
296 }
297
298 for (opt_iter = 6; opt_iter < opt_len;) {
299 if (opt_iter + 1 == opt_len) {
300 err_offset = opt_iter;
301 goto out;
302 }
303 tag_len = opt[opt_iter + 1];
304 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
305 err_offset = opt_iter + 1;
306 goto out;
307 }
308 opt_iter += tag_len;
309 }
310
311out:
312 *option = opt + err_offset;
313 return err_offset;
314
315}
316#endif /* CONFIG_NETLABEL */
317
318#endif /* _CIPSO_IPV4_H */
1/*
2 * CIPSO - Commercial IP Security Option
3 *
4 * This is an implementation of the CIPSO 2.2 protocol as specified in
5 * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
6 * FIPS-188, copies of both documents can be found in the Documentation
7 * directory. While CIPSO never became a full IETF RFC standard many vendors
8 * have chosen to adopt the protocol and over the years it has become a
9 * de-facto standard for labeled networking.
10 *
11 * Author: Paul Moore <paul@paul-moore.com>
12 *
13 */
14
15/*
16 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
17 *
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2 of the License, or
21 * (at your option) any later version.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
26 * the GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, see <http://www.gnu.org/licenses/>.
30 *
31 */
32
33#ifndef _CIPSO_IPV4_H
34#define _CIPSO_IPV4_H
35
36#include <linux/types.h>
37#include <linux/rcupdate.h>
38#include <linux/list.h>
39#include <linux/net.h>
40#include <linux/skbuff.h>
41#include <net/netlabel.h>
42#include <net/request_sock.h>
43#include <linux/atomic.h>
44#include <asm/unaligned.h>
45
46/* known doi values */
47#define CIPSO_V4_DOI_UNKNOWN 0x00000000
48
49/* standard tag types */
50#define CIPSO_V4_TAG_INVALID 0
51#define CIPSO_V4_TAG_RBITMAP 1
52#define CIPSO_V4_TAG_ENUM 2
53#define CIPSO_V4_TAG_RANGE 5
54#define CIPSO_V4_TAG_PBITMAP 6
55#define CIPSO_V4_TAG_FREEFORM 7
56
57/* non-standard tag types (tags > 127) */
58#define CIPSO_V4_TAG_LOCAL 128
59
60/* doi mapping types */
61#define CIPSO_V4_MAP_UNKNOWN 0
62#define CIPSO_V4_MAP_TRANS 1
63#define CIPSO_V4_MAP_PASS 2
64#define CIPSO_V4_MAP_LOCAL 3
65
66/* limits */
67#define CIPSO_V4_MAX_REM_LVLS 255
68#define CIPSO_V4_INV_LVL 0x80000000
69#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
70#define CIPSO_V4_MAX_REM_CATS 65534
71#define CIPSO_V4_INV_CAT 0x80000000
72#define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)
73
74/*
75 * CIPSO DOI definitions
76 */
77
78/* DOI definition struct */
79#define CIPSO_V4_TAG_MAXCNT 5
80struct cipso_v4_doi {
81 u32 doi;
82 u32 type;
83 union {
84 struct cipso_v4_std_map_tbl *std;
85 } map;
86 u8 tags[CIPSO_V4_TAG_MAXCNT];
87
88 atomic_t refcount;
89 struct list_head list;
90 struct rcu_head rcu;
91};
92
93/* Standard CIPSO mapping table */
94/* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
95 * bit is set then consider that value as unspecified, meaning the
96 * mapping for that particular level/category is invalid */
97struct cipso_v4_std_map_tbl {
98 struct {
99 u32 *cipso;
100 u32 *local;
101 u32 cipso_size;
102 u32 local_size;
103 } lvl;
104 struct {
105 u32 *cipso;
106 u32 *local;
107 u32 cipso_size;
108 u32 local_size;
109 } cat;
110};
111
112/*
113 * Sysctl Variables
114 */
115
116#ifdef CONFIG_NETLABEL
117extern int cipso_v4_cache_enabled;
118extern int cipso_v4_cache_bucketsize;
119extern int cipso_v4_rbm_optfmt;
120extern int cipso_v4_rbm_strictvalid;
121#endif
122
123/*
124 * Helper Functions
125 */
126
127#define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0)
128#define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso)
129
130/*
131 * DOI List Functions
132 */
133
134#ifdef CONFIG_NETLABEL
135int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
136 struct netlbl_audit *audit_info);
137void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
138int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
139struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
140void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
141int cipso_v4_doi_walk(u32 *skip_cnt,
142 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
143 void *cb_arg);
144#else
145static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
146 struct netlbl_audit *audit_info)
147{
148 return -ENOSYS;
149}
150
151static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
152{
153 return;
154}
155
156static inline int cipso_v4_doi_remove(u32 doi,
157 struct netlbl_audit *audit_info)
158{
159 return 0;
160}
161
162static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
163{
164 return NULL;
165}
166
167static inline int cipso_v4_doi_walk(u32 *skip_cnt,
168 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
169 void *cb_arg)
170{
171 return 0;
172}
173
174static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
175 const char *domain)
176{
177 return -ENOSYS;
178}
179
180static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
181 const char *domain)
182{
183 return 0;
184}
185#endif /* CONFIG_NETLABEL */
186
187/*
188 * Label Mapping Cache Functions
189 */
190
191#ifdef CONFIG_NETLABEL
192void cipso_v4_cache_invalidate(void);
193int cipso_v4_cache_add(const struct sk_buff *skb,
194 const struct netlbl_lsm_secattr *secattr);
195#else
196static inline void cipso_v4_cache_invalidate(void)
197{
198 return;
199}
200
201static inline int cipso_v4_cache_add(const struct sk_buff *skb,
202 const struct netlbl_lsm_secattr *secattr)
203{
204 return 0;
205}
206#endif /* CONFIG_NETLABEL */
207
208/*
209 * Protocol Handling Functions
210 */
211
212#ifdef CONFIG_NETLABEL
213void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
214int cipso_v4_sock_setattr(struct sock *sk,
215 const struct cipso_v4_doi *doi_def,
216 const struct netlbl_lsm_secattr *secattr);
217void cipso_v4_sock_delattr(struct sock *sk);
218int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
219int cipso_v4_req_setattr(struct request_sock *req,
220 const struct cipso_v4_doi *doi_def,
221 const struct netlbl_lsm_secattr *secattr);
222void cipso_v4_req_delattr(struct request_sock *req);
223int cipso_v4_skbuff_setattr(struct sk_buff *skb,
224 const struct cipso_v4_doi *doi_def,
225 const struct netlbl_lsm_secattr *secattr);
226int cipso_v4_skbuff_delattr(struct sk_buff *skb);
227int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
228 struct netlbl_lsm_secattr *secattr);
229int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
230#else
231static inline void cipso_v4_error(struct sk_buff *skb,
232 int error,
233 u32 gateway)
234{
235 return;
236}
237
238static inline int cipso_v4_sock_setattr(struct sock *sk,
239 const struct cipso_v4_doi *doi_def,
240 const struct netlbl_lsm_secattr *secattr)
241{
242 return -ENOSYS;
243}
244
245static inline void cipso_v4_sock_delattr(struct sock *sk)
246{
247}
248
249static inline int cipso_v4_sock_getattr(struct sock *sk,
250 struct netlbl_lsm_secattr *secattr)
251{
252 return -ENOSYS;
253}
254
255static inline int cipso_v4_req_setattr(struct request_sock *req,
256 const struct cipso_v4_doi *doi_def,
257 const struct netlbl_lsm_secattr *secattr)
258{
259 return -ENOSYS;
260}
261
262static inline void cipso_v4_req_delattr(struct request_sock *req)
263{
264 return;
265}
266
267static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
268 const struct cipso_v4_doi *doi_def,
269 const struct netlbl_lsm_secattr *secattr)
270{
271 return -ENOSYS;
272}
273
274static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
275{
276 return -ENOSYS;
277}
278
279static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
280 struct netlbl_lsm_secattr *secattr)
281{
282 return -ENOSYS;
283}
284
285static inline int cipso_v4_validate(const struct sk_buff *skb,
286 unsigned char **option)
287{
288 unsigned char *opt = *option;
289 unsigned char err_offset = 0;
290 u8 opt_len = opt[1];
291 u8 opt_iter;
292 u8 tag_len;
293
294 if (opt_len < 8) {
295 err_offset = 1;
296 goto out;
297 }
298
299 if (get_unaligned_be32(&opt[2]) == 0) {
300 err_offset = 2;
301 goto out;
302 }
303
304 for (opt_iter = 6; opt_iter < opt_len;) {
305 tag_len = opt[opt_iter + 1];
306 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
307 err_offset = opt_iter + 1;
308 goto out;
309 }
310 opt_iter += tag_len;
311 }
312
313out:
314 *option = opt + err_offset;
315 return err_offset;
316
317}
318#endif /* CONFIG_NETLABEL */
319
320#endif /* _CIPSO_IPV4_H */