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Linux/include/net/cipso_ipv4.h

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  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
 67 struct 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 */
 84 struct 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
104 extern int cipso_v4_cache_enabled;
105 extern int cipso_v4_cache_bucketsize;
106 extern int cipso_v4_rbm_optfmt;
107 extern int cipso_v4_rbm_strictvalid;
108 #endif
109 
110 /*
111  * DOI List Functions
112  */
113 
114 #ifdef CONFIG_NETLABEL
115 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
116                      struct netlbl_audit *audit_info);
117 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
118 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
119 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
120 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
121 int cipso_v4_doi_walk(u32 *skip_cnt,
122                      int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
123                      void *cb_arg);
124 #else
125 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
126                                    struct netlbl_audit *audit_info)
127 {
128         return -ENOSYS;
129 }
130 
131 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
132 {
133         return;
134 }
135 
136 static inline int cipso_v4_doi_remove(u32 doi,
137                                       struct netlbl_audit *audit_info)
138 {
139         return 0;
140 }
141 
142 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
143 {
144         return NULL;
145 }
146 
147 static 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 
154 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
155                                           const char *domain)
156 {
157         return -ENOSYS;
158 }
159 
160 static 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
172 void cipso_v4_cache_invalidate(void);
173 int cipso_v4_cache_add(const unsigned char *cipso_ptr,
174                        const struct netlbl_lsm_secattr *secattr);
175 #else
176 static inline void cipso_v4_cache_invalidate(void)
177 {
178         return;
179 }
180 
181 static 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
193 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
194 int cipso_v4_getattr(const unsigned char *cipso,
195                      struct netlbl_lsm_secattr *secattr);
196 int cipso_v4_sock_setattr(struct sock *sk,
197                           const struct cipso_v4_doi *doi_def,
198                           const struct netlbl_lsm_secattr *secattr);
199 void cipso_v4_sock_delattr(struct sock *sk);
200 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
201 int cipso_v4_req_setattr(struct request_sock *req,
202                          const struct cipso_v4_doi *doi_def,
203                          const struct netlbl_lsm_secattr *secattr);
204 void cipso_v4_req_delattr(struct request_sock *req);
205 int cipso_v4_skbuff_setattr(struct sk_buff *skb,
206                             const struct cipso_v4_doi *doi_def,
207                             const struct netlbl_lsm_secattr *secattr);
208 int cipso_v4_skbuff_delattr(struct sk_buff *skb);
209 int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
210                             struct netlbl_lsm_secattr *secattr);
211 unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
212 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
213 #else
214 static inline void cipso_v4_error(struct sk_buff *skb,
215                                   int error,
216                                   u32 gateway)
217 {
218         return;
219 }
220 
221 static inline int cipso_v4_getattr(const unsigned char *cipso,
222                                    struct netlbl_lsm_secattr *secattr)
223 {
224         return -ENOSYS;
225 }
226 
227 static 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 
234 static inline void cipso_v4_sock_delattr(struct sock *sk)
235 {
236 }
237 
238 static inline int cipso_v4_sock_getattr(struct sock *sk,
239                                         struct netlbl_lsm_secattr *secattr)
240 {
241         return -ENOSYS;
242 }
243 
244 static 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 
251 static inline void cipso_v4_req_delattr(struct request_sock *req)
252 {
253         return;
254 }
255 
256 static 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 
263 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
264 {
265         return -ENOSYS;
266 }
267 
268 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
269                                           struct netlbl_lsm_secattr *secattr)
270 {
271         return -ENOSYS;
272 }
273 
274 static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
275 {
276         return NULL;
277 }
278 
279 static 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 
311 out:
312         *option = opt + err_offset;
313         return err_offset;
314 
315 }
316 #endif /* CONFIG_NETLABEL */
317 
318 #endif /* _CIPSO_IPV4_H */
319 

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