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Linux/include/net/cipso_ipv4.h

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  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 <linux/refcount.h>
 45 #include <asm/unaligned.h>
 46 
 47 /* known doi values */
 48 #define CIPSO_V4_DOI_UNKNOWN          0x00000000
 49 
 50 /* standard tag types */
 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 
 58 /* non-standard tag types (tags > 127) */
 59 #define CIPSO_V4_TAG_LOCAL            128
 60 
 61 /* doi mapping types */
 62 #define CIPSO_V4_MAP_UNKNOWN          0
 63 #define CIPSO_V4_MAP_TRANS            1
 64 #define CIPSO_V4_MAP_PASS             2
 65 #define CIPSO_V4_MAP_LOCAL            3
 66 
 67 /* limits */
 68 #define CIPSO_V4_MAX_REM_LVLS         255
 69 #define CIPSO_V4_INV_LVL              0x80000000
 70 #define CIPSO_V4_MAX_LOC_LVLS         (CIPSO_V4_INV_LVL - 1)
 71 #define CIPSO_V4_MAX_REM_CATS         65534
 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 
 89         refcount_t refcount;
 90         struct list_head list;
 91         struct rcu_head rcu;
 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 
124 /*
125  * DOI List Functions
126  */
127 
128 #ifdef CONFIG_NETLABEL
129 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
130                      struct netlbl_audit *audit_info);
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);
133 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
134 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
135 int cipso_v4_doi_walk(u32 *skip_cnt,
136                      int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
137                      void *cb_arg);
138 #else
139 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
140                                    struct netlbl_audit *audit_info)
141 {
142         return -ENOSYS;
143 }
144 
145 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
146 {
147         return;
148 }
149 
150 static inline int cipso_v4_doi_remove(u32 doi,
151                                       struct netlbl_audit *audit_info)
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 
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)
164 {
165         return 0;
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);
187 int cipso_v4_cache_add(const unsigned char *cipso_ptr,
188                        const struct netlbl_lsm_secattr *secattr);
189 #else
190 static inline void cipso_v4_cache_invalidate(void)
191 {
192         return;
193 }
194 
195 static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
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);
208 int cipso_v4_getattr(const unsigned char *cipso,
209                      struct netlbl_lsm_secattr *secattr);
210 int cipso_v4_sock_setattr(struct sock *sk,
211                           const struct cipso_v4_doi *doi_def,
212                           const struct netlbl_lsm_secattr *secattr);
213 void cipso_v4_sock_delattr(struct sock *sk);
214 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
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);
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);
223 int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
224                             struct netlbl_lsm_secattr *secattr);
225 unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
226 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
227 #else
228 static inline void cipso_v4_error(struct sk_buff *skb,
229                                   int error,
230                                   u32 gateway)
231 {
232         return;
233 }
234 
235 static inline int cipso_v4_getattr(const unsigned char *cipso,
236                                    struct netlbl_lsm_secattr *secattr)
237 {
238         return -ENOSYS;
239 }
240 
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)
244 {
245         return -ENOSYS;
246 }
247 
248 static inline void cipso_v4_sock_delattr(struct sock *sk)
249 {
250 }
251 
252 static inline int cipso_v4_sock_getattr(struct sock *sk,
253                                         struct netlbl_lsm_secattr *secattr)
254 {
255         return -ENOSYS;
256 }
257 
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 
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 
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 
288 static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
289 {
290         return NULL;
291 }
292 
293 static inline int cipso_v4_validate(const struct sk_buff *skb,
294                                     unsigned char **option)
295 {
296         unsigned char *opt = *option;
297         unsigned char err_offset = 0;
298         u8 opt_len = opt[1];
299         u8 opt_iter;
300         u8 tag_len;
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;) {
313                 if (opt_iter + 1 == opt_len) {
314                         err_offset = opt_iter;
315                         goto out;
316                 }
317                 tag_len = opt[opt_iter + 1];
318                 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
319                         err_offset = opt_iter + 1;
320                         goto out;
321                 }
322                 opt_iter += tag_len;
323         }
324 
325 out:
326         *option = opt + err_offset;
327         return err_offset;
328 
329 }
330 #endif /* CONFIG_NETLABEL */
331 
332 #endif /* _CIPSO_IPV4_H */
333 

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