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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 | * | |
11 | * Author: Paul Moore <paul.moore@hp.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, write to the Free Software | |
30 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
31 | * | |
32 | */ | |
33 | ||
34 | #ifndef _CIPSO_IPV4_H | |
35 | #define _CIPSO_IPV4_H | |
36 | ||
37 | #include <linux/types.h> | |
38 | #include <linux/rcupdate.h> | |
39 | #include <linux/list.h> | |
7a0e1d60 PM |
40 | #include <linux/net.h> |
41 | #include <linux/skbuff.h> | |
11a03f78 | 42 | #include <net/netlabel.h> |
b1edeb10 | 43 | #include <asm/atomic.h> |
11a03f78 PM |
44 | |
45 | /* known doi values */ | |
46 | #define CIPSO_V4_DOI_UNKNOWN 0x00000000 | |
47 | ||
15c45f7b | 48 | /* standard tag types */ |
11a03f78 PM |
49 | #define CIPSO_V4_TAG_INVALID 0 |
50 | #define CIPSO_V4_TAG_RBITMAP 1 | |
51 | #define CIPSO_V4_TAG_ENUM 2 | |
52 | #define CIPSO_V4_TAG_RANGE 5 | |
53 | #define CIPSO_V4_TAG_PBITMAP 6 | |
54 | #define CIPSO_V4_TAG_FREEFORM 7 | |
55 | ||
15c45f7b PM |
56 | /* non-standard tag types (tags > 127) */ |
57 | #define CIPSO_V4_TAG_LOCAL 128 | |
58 | ||
11a03f78 PM |
59 | /* doi mapping types */ |
60 | #define CIPSO_V4_MAP_UNKNOWN 0 | |
15c45f7b | 61 | #define CIPSO_V4_MAP_TRANS 1 |
11a03f78 | 62 | #define CIPSO_V4_MAP_PASS 2 |
15c45f7b | 63 | #define CIPSO_V4_MAP_LOCAL 3 |
11a03f78 PM |
64 | |
65 | /* limits */ | |
c6b1677a | 66 | #define CIPSO_V4_MAX_REM_LVLS 255 |
11a03f78 PM |
67 | #define CIPSO_V4_INV_LVL 0x80000000 |
68 | #define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1) | |
c6b1677a | 69 | #define CIPSO_V4_MAX_REM_CATS 65534 |
11a03f78 PM |
70 | #define CIPSO_V4_INV_CAT 0x80000000 |
71 | #define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1) | |
72 | ||
73 | /* | |
74 | * CIPSO DOI definitions | |
75 | */ | |
76 | ||
77 | /* DOI definition struct */ | |
78 | #define CIPSO_V4_TAG_MAXCNT 5 | |
79 | struct cipso_v4_doi { | |
80 | u32 doi; | |
81 | u32 type; | |
82 | union { | |
83 | struct cipso_v4_std_map_tbl *std; | |
84 | } map; | |
85 | u8 tags[CIPSO_V4_TAG_MAXCNT]; | |
86 | ||
b1edeb10 | 87 | atomic_t refcount; |
11a03f78 PM |
88 | struct list_head list; |
89 | struct rcu_head rcu; | |
11a03f78 PM |
90 | }; |
91 | ||
92 | /* Standard CIPSO mapping table */ | |
93 | /* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the | |
94 | * bit is set then consider that value as unspecified, meaning the | |
95 | * mapping for that particular level/category is invalid */ | |
96 | struct cipso_v4_std_map_tbl { | |
97 | struct { | |
98 | u32 *cipso; | |
99 | u32 *local; | |
100 | u32 cipso_size; | |
101 | u32 local_size; | |
102 | } lvl; | |
103 | struct { | |
104 | u32 *cipso; | |
105 | u32 *local; | |
106 | u32 cipso_size; | |
107 | u32 local_size; | |
108 | } cat; | |
109 | }; | |
110 | ||
111 | /* | |
112 | * Sysctl Variables | |
113 | */ | |
114 | ||
115 | #ifdef CONFIG_NETLABEL | |
116 | extern int cipso_v4_cache_enabled; | |
117 | extern int cipso_v4_cache_bucketsize; | |
118 | extern int cipso_v4_rbm_optfmt; | |
119 | extern int cipso_v4_rbm_strictvalid; | |
120 | #endif | |
121 | ||
122 | /* | |
123 | * Helper Functions | |
124 | */ | |
125 | ||
126 | #define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0) | |
d56f90a7 | 127 | #define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso) |
11a03f78 PM |
128 | |
129 | /* | |
130 | * DOI List Functions | |
131 | */ | |
132 | ||
133 | #ifdef CONFIG_NETLABEL | |
6c2e8ac0 PM |
134 | int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, |
135 | struct netlbl_audit *audit_info); | |
b1edeb10 PM |
136 | void cipso_v4_doi_free(struct cipso_v4_doi *doi_def); |
137 | int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info); | |
11a03f78 | 138 | struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi); |
b1edeb10 | 139 | void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def); |
fcd48280 PM |
140 | int cipso_v4_doi_walk(u32 *skip_cnt, |
141 | int (*callback) (struct cipso_v4_doi *doi_def, void *arg), | |
142 | void *cb_arg); | |
11a03f78 | 143 | #else |
6c2e8ac0 PM |
144 | static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, |
145 | struct netlbl_audit *audit_info) | |
11a03f78 PM |
146 | { |
147 | return -ENOSYS; | |
148 | } | |
149 | ||
b1edeb10 PM |
150 | static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def) |
151 | { | |
152 | return; | |
153 | } | |
154 | ||
11a03f78 | 155 | static inline int cipso_v4_doi_remove(u32 doi, |
b1edeb10 | 156 | struct netlbl_audit *audit_info) |
11a03f78 PM |
157 | { |
158 | return 0; | |
159 | } | |
160 | ||
161 | static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) | |
162 | { | |
163 | return NULL; | |
164 | } | |
165 | ||
fcd48280 PM |
166 | static inline int cipso_v4_doi_walk(u32 *skip_cnt, |
167 | int (*callback) (struct cipso_v4_doi *doi_def, void *arg), | |
168 | void *cb_arg) | |
11a03f78 | 169 | { |
fcd48280 | 170 | return 0; |
11a03f78 PM |
171 | } |
172 | ||
173 | static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, | |
174 | const char *domain) | |
175 | { | |
176 | return -ENOSYS; | |
177 | } | |
178 | ||
179 | static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, | |
180 | const char *domain) | |
181 | { | |
182 | return 0; | |
183 | } | |
184 | #endif /* CONFIG_NETLABEL */ | |
185 | ||
186 | /* | |
187 | * Label Mapping Cache Functions | |
188 | */ | |
189 | ||
190 | #ifdef CONFIG_NETLABEL | |
191 | void cipso_v4_cache_invalidate(void); | |
192 | int cipso_v4_cache_add(const struct sk_buff *skb, | |
193 | const struct netlbl_lsm_secattr *secattr); | |
194 | #else | |
195 | static inline void cipso_v4_cache_invalidate(void) | |
196 | { | |
197 | return; | |
198 | } | |
199 | ||
200 | static inline int cipso_v4_cache_add(const struct sk_buff *skb, | |
201 | const struct netlbl_lsm_secattr *secattr) | |
202 | { | |
203 | return 0; | |
204 | } | |
205 | #endif /* CONFIG_NETLABEL */ | |
206 | ||
207 | /* | |
208 | * Protocol Handling Functions | |
209 | */ | |
210 | ||
211 | #ifdef CONFIG_NETLABEL | |
212 | void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway); | |
ba6ff9f2 PM |
213 | int cipso_v4_sock_setattr(struct sock *sk, |
214 | const struct cipso_v4_doi *doi_def, | |
215 | const struct netlbl_lsm_secattr *secattr); | |
014ab19a | 216 | void cipso_v4_sock_delattr(struct sock *sk); |
14a72f53 | 217 | int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr); |
948bf85c PM |
218 | int cipso_v4_skbuff_setattr(struct sk_buff *skb, |
219 | const struct cipso_v4_doi *doi_def, | |
220 | const struct netlbl_lsm_secattr *secattr); | |
221 | int cipso_v4_skbuff_delattr(struct sk_buff *skb); | |
11a03f78 PM |
222 | int cipso_v4_skbuff_getattr(const struct sk_buff *skb, |
223 | struct netlbl_lsm_secattr *secattr); | |
15c45f7b | 224 | int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option); |
11a03f78 PM |
225 | #else |
226 | static inline void cipso_v4_error(struct sk_buff *skb, | |
227 | int error, | |
228 | u32 gateway) | |
229 | { | |
230 | return; | |
231 | } | |
232 | ||
ba6ff9f2 PM |
233 | static inline int cipso_v4_sock_setattr(struct sock *sk, |
234 | const struct cipso_v4_doi *doi_def, | |
235 | const struct netlbl_lsm_secattr *secattr) | |
11a03f78 PM |
236 | { |
237 | return -ENOSYS; | |
238 | } | |
239 | ||
014ab19a PM |
240 | static inline void cipso_v4_sock_delattr(struct sock *sk) |
241 | { | |
242 | } | |
243 | ||
14a72f53 PM |
244 | static inline int cipso_v4_sock_getattr(struct sock *sk, |
245 | struct netlbl_lsm_secattr *secattr) | |
246 | { | |
247 | return -ENOSYS; | |
248 | } | |
249 | ||
948bf85c PM |
250 | static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb, |
251 | const struct cipso_v4_doi *doi_def, | |
252 | const struct netlbl_lsm_secattr *secattr) | |
253 | { | |
254 | return -ENOSYS; | |
255 | } | |
256 | ||
257 | static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb) | |
258 | { | |
259 | return -ENOSYS; | |
260 | } | |
261 | ||
11a03f78 PM |
262 | static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb, |
263 | struct netlbl_lsm_secattr *secattr) | |
264 | { | |
265 | return -ENOSYS; | |
266 | } | |
267 | ||
15c45f7b PM |
268 | static inline int cipso_v4_validate(const struct sk_buff *skb, |
269 | unsigned char **option) | |
11a03f78 PM |
270 | { |
271 | return -ENOSYS; | |
272 | } | |
273 | #endif /* CONFIG_NETLABEL */ | |
274 | ||
275 | #endif /* _CIPSO_IPV4_H */ |