Commit | Line | Data |
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11a03f78 PM |
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 | * | |
82c21bfa | 11 | * Author: Paul Moore <paul@paul-moore.com> |
11a03f78 PM |
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 | |
a6227e26 | 29 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
11a03f78 PM |
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> | |
7a0e1d60 PM |
39 | #include <linux/net.h> |
40 | #include <linux/skbuff.h> | |
11a03f78 | 41 | #include <net/netlabel.h> |
389fb800 | 42 | #include <net/request_sock.h> |
60063497 | 43 | #include <linux/atomic.h> |
f6a6fede | 44 | #include <linux/refcount.h> |
20e2a864 | 45 | #include <asm/unaligned.h> |
11a03f78 PM |
46 | |
47 | /* known doi values */ | |
48 | #define CIPSO_V4_DOI_UNKNOWN 0x00000000 | |
49 | ||
15c45f7b | 50 | /* standard tag types */ |
11a03f78 PM |
51 | #define CIPSO_V4_TAG_INVALID 0 |
52 | #define CIPSO_V4_TAG_RBITMAP 1 | |
53 | #define CIPSO_V4_TAG_ENUM 2 | |
54 | #define CIPSO_V4_TAG_RANGE 5 | |
55 | #define CIPSO_V4_TAG_PBITMAP 6 | |
56 | #define CIPSO_V4_TAG_FREEFORM 7 | |
57 | ||
15c45f7b PM |
58 | /* non-standard tag types (tags > 127) */ |
59 | #define CIPSO_V4_TAG_LOCAL 128 | |
60 | ||
11a03f78 PM |
61 | /* doi mapping types */ |
62 | #define CIPSO_V4_MAP_UNKNOWN 0 | |
15c45f7b | 63 | #define CIPSO_V4_MAP_TRANS 1 |
11a03f78 | 64 | #define CIPSO_V4_MAP_PASS 2 |
15c45f7b | 65 | #define CIPSO_V4_MAP_LOCAL 3 |
11a03f78 PM |
66 | |
67 | /* limits */ | |
c6b1677a | 68 | #define CIPSO_V4_MAX_REM_LVLS 255 |
11a03f78 PM |
69 | #define CIPSO_V4_INV_LVL 0x80000000 |
70 | #define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1) | |
c6b1677a | 71 | #define CIPSO_V4_MAX_REM_CATS 65534 |
11a03f78 PM |
72 | #define CIPSO_V4_INV_CAT 0x80000000 |
73 | #define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1) | |
74 | ||
75 | /* | |
76 | * CIPSO DOI definitions | |
77 | */ | |
78 | ||
79 | /* DOI definition struct */ | |
80 | #define CIPSO_V4_TAG_MAXCNT 5 | |
81 | struct cipso_v4_doi { | |
82 | u32 doi; | |
83 | u32 type; | |
84 | union { | |
85 | struct cipso_v4_std_map_tbl *std; | |
86 | } map; | |
87 | u8 tags[CIPSO_V4_TAG_MAXCNT]; | |
88 | ||
f6a6fede | 89 | refcount_t refcount; |
11a03f78 PM |
90 | struct list_head list; |
91 | struct rcu_head rcu; | |
11a03f78 PM |
92 | }; |
93 | ||
94 | /* Standard CIPSO mapping table */ | |
95 | /* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the | |
96 | * bit is set then consider that value as unspecified, meaning the | |
97 | * mapping for that particular level/category is invalid */ | |
98 | struct cipso_v4_std_map_tbl { | |
99 | struct { | |
100 | u32 *cipso; | |
101 | u32 *local; | |
102 | u32 cipso_size; | |
103 | u32 local_size; | |
104 | } lvl; | |
105 | struct { | |
106 | u32 *cipso; | |
107 | u32 *local; | |
108 | u32 cipso_size; | |
109 | u32 local_size; | |
110 | } cat; | |
111 | }; | |
112 | ||
113 | /* | |
114 | * Sysctl Variables | |
115 | */ | |
116 | ||
117 | #ifdef CONFIG_NETLABEL | |
118 | extern int cipso_v4_cache_enabled; | |
119 | extern int cipso_v4_cache_bucketsize; | |
120 | extern int cipso_v4_rbm_optfmt; | |
121 | extern int cipso_v4_rbm_strictvalid; | |
122 | #endif | |
123 | ||
11a03f78 PM |
124 | /* |
125 | * DOI List Functions | |
126 | */ | |
127 | ||
128 | #ifdef CONFIG_NETLABEL | |
6c2e8ac0 PM |
129 | int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, |
130 | struct netlbl_audit *audit_info); | |
b1edeb10 PM |
131 | void cipso_v4_doi_free(struct cipso_v4_doi *doi_def); |
132 | int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info); | |
11a03f78 | 133 | struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi); |
b1edeb10 | 134 | void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def); |
fcd48280 PM |
135 | int cipso_v4_doi_walk(u32 *skip_cnt, |
136 | int (*callback) (struct cipso_v4_doi *doi_def, void *arg), | |
137 | void *cb_arg); | |
11a03f78 | 138 | #else |
6c2e8ac0 PM |
139 | static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, |
140 | struct netlbl_audit *audit_info) | |
11a03f78 PM |
141 | { |
142 | return -ENOSYS; | |
143 | } | |
144 | ||
b1edeb10 PM |
145 | static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def) |
146 | { | |
147 | return; | |
148 | } | |
149 | ||
11a03f78 | 150 | static inline int cipso_v4_doi_remove(u32 doi, |
b1edeb10 | 151 | struct netlbl_audit *audit_info) |
11a03f78 PM |
152 | { |
153 | return 0; | |
154 | } | |
155 | ||
156 | static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) | |
157 | { | |
158 | return NULL; | |
159 | } | |
160 | ||
fcd48280 PM |
161 | static inline int cipso_v4_doi_walk(u32 *skip_cnt, |
162 | int (*callback) (struct cipso_v4_doi *doi_def, void *arg), | |
163 | void *cb_arg) | |
11a03f78 | 164 | { |
fcd48280 | 165 | return 0; |
11a03f78 PM |
166 | } |
167 | ||
168 | static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, | |
169 | const char *domain) | |
170 | { | |
171 | return -ENOSYS; | |
172 | } | |
173 | ||
174 | static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, | |
175 | const char *domain) | |
176 | { | |
177 | return 0; | |
178 | } | |
179 | #endif /* CONFIG_NETLABEL */ | |
180 | ||
181 | /* | |
182 | * Label Mapping Cache Functions | |
183 | */ | |
184 | ||
185 | #ifdef CONFIG_NETLABEL | |
186 | void cipso_v4_cache_invalidate(void); | |
04f81f01 | 187 | int cipso_v4_cache_add(const unsigned char *cipso_ptr, |
11a03f78 PM |
188 | const struct netlbl_lsm_secattr *secattr); |
189 | #else | |
190 | static inline void cipso_v4_cache_invalidate(void) | |
191 | { | |
192 | return; | |
193 | } | |
194 | ||
04f81f01 | 195 | static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr, |
11a03f78 PM |
196 | const struct netlbl_lsm_secattr *secattr) |
197 | { | |
198 | return 0; | |
199 | } | |
200 | #endif /* CONFIG_NETLABEL */ | |
201 | ||
202 | /* | |
203 | * Protocol Handling Functions | |
204 | */ | |
205 | ||
206 | #ifdef CONFIG_NETLABEL | |
207 | void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway); | |
04f81f01 PM |
208 | int cipso_v4_getattr(const unsigned char *cipso, |
209 | struct netlbl_lsm_secattr *secattr); | |
ba6ff9f2 PM |
210 | int cipso_v4_sock_setattr(struct sock *sk, |
211 | const struct cipso_v4_doi *doi_def, | |
212 | const struct netlbl_lsm_secattr *secattr); | |
014ab19a | 213 | void cipso_v4_sock_delattr(struct sock *sk); |
14a72f53 | 214 | int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr); |
389fb800 PM |
215 | int cipso_v4_req_setattr(struct request_sock *req, |
216 | const struct cipso_v4_doi *doi_def, | |
217 | const struct netlbl_lsm_secattr *secattr); | |
218 | void cipso_v4_req_delattr(struct request_sock *req); | |
948bf85c PM |
219 | int cipso_v4_skbuff_setattr(struct sk_buff *skb, |
220 | const struct cipso_v4_doi *doi_def, | |
221 | const struct netlbl_lsm_secattr *secattr); | |
222 | int cipso_v4_skbuff_delattr(struct sk_buff *skb); | |
11a03f78 PM |
223 | int cipso_v4_skbuff_getattr(const struct sk_buff *skb, |
224 | struct netlbl_lsm_secattr *secattr); | |
04f81f01 | 225 | unsigned char *cipso_v4_optptr(const struct sk_buff *skb); |
15c45f7b | 226 | int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option); |
11a03f78 PM |
227 | #else |
228 | static inline void cipso_v4_error(struct sk_buff *skb, | |
229 | int error, | |
230 | u32 gateway) | |
231 | { | |
232 | return; | |
233 | } | |
234 | ||
04f81f01 PM |
235 | static inline int cipso_v4_getattr(const unsigned char *cipso, |
236 | struct netlbl_lsm_secattr *secattr) | |
237 | { | |
238 | return -ENOSYS; | |
239 | } | |
240 | ||
ba6ff9f2 PM |
241 | static inline int cipso_v4_sock_setattr(struct sock *sk, |
242 | const struct cipso_v4_doi *doi_def, | |
243 | const struct netlbl_lsm_secattr *secattr) | |
11a03f78 PM |
244 | { |
245 | return -ENOSYS; | |
246 | } | |
247 | ||
014ab19a PM |
248 | static inline void cipso_v4_sock_delattr(struct sock *sk) |
249 | { | |
250 | } | |
251 | ||
14a72f53 PM |
252 | static inline int cipso_v4_sock_getattr(struct sock *sk, |
253 | struct netlbl_lsm_secattr *secattr) | |
254 | { | |
255 | return -ENOSYS; | |
256 | } | |
257 | ||
389fb800 PM |
258 | static inline int cipso_v4_req_setattr(struct request_sock *req, |
259 | const struct cipso_v4_doi *doi_def, | |
260 | const struct netlbl_lsm_secattr *secattr) | |
261 | { | |
262 | return -ENOSYS; | |
263 | } | |
264 | ||
265 | static inline void cipso_v4_req_delattr(struct request_sock *req) | |
266 | { | |
267 | return; | |
268 | } | |
269 | ||
948bf85c PM |
270 | static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb, |
271 | const struct cipso_v4_doi *doi_def, | |
272 | const struct netlbl_lsm_secattr *secattr) | |
273 | { | |
274 | return -ENOSYS; | |
275 | } | |
276 | ||
277 | static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb) | |
278 | { | |
279 | return -ENOSYS; | |
280 | } | |
281 | ||
11a03f78 PM |
282 | static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb, |
283 | struct netlbl_lsm_secattr *secattr) | |
284 | { | |
285 | return -ENOSYS; | |
286 | } | |
287 | ||
04f81f01 PM |
288 | static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb) |
289 | { | |
290 | return NULL; | |
291 | } | |
292 | ||
15c45f7b PM |
293 | static inline int cipso_v4_validate(const struct sk_buff *skb, |
294 | unsigned char **option) | |
11a03f78 | 295 | { |
20e2a864 PM |
296 | unsigned char *opt = *option; |
297 | unsigned char err_offset = 0; | |
298 | u8 opt_len = opt[1]; | |
299 | u8 opt_iter; | |
f2e5ddcc | 300 | u8 tag_len; |
20e2a864 PM |
301 | |
302 | if (opt_len < 8) { | |
303 | err_offset = 1; | |
304 | goto out; | |
305 | } | |
306 | ||
307 | if (get_unaligned_be32(&opt[2]) == 0) { | |
308 | err_offset = 2; | |
309 | goto out; | |
310 | } | |
311 | ||
312 | for (opt_iter = 6; opt_iter < opt_len;) { | |
d71b7896 ED |
313 | if (opt_iter + 1 == opt_len) { |
314 | err_offset = opt_iter; | |
315 | goto out; | |
316 | } | |
f2e5ddcc | 317 | tag_len = opt[opt_iter + 1]; |
10ae76fa | 318 | if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) { |
20e2a864 PM |
319 | err_offset = opt_iter + 1; |
320 | goto out; | |
321 | } | |
f2e5ddcc | 322 | opt_iter += tag_len; |
20e2a864 PM |
323 | } |
324 | ||
325 | out: | |
326 | *option = opt + err_offset; | |
327 | return err_offset; | |
328 | ||
11a03f78 PM |
329 | } |
330 | #endif /* CONFIG_NETLABEL */ | |
331 | ||
332 | #endif /* _CIPSO_IPV4_H */ |