xref: /openbmc/linux/include/net/cipso_ipv4.h (revision 75f25bd3)
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, 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>
40 #include <linux/net.h>
41 #include <linux/skbuff.h>
42 #include <net/netlabel.h>
43 #include <net/request_sock.h>
44 #include <linux/atomic.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
80 struct 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 */
97 struct 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
117 extern int cipso_v4_cache_enabled;
118 extern int cipso_v4_cache_bucketsize;
119 extern int cipso_v4_rbm_optfmt;
120 extern 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
135 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
136 		     struct netlbl_audit *audit_info);
137 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
138 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
139 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
140 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
141 int cipso_v4_doi_walk(u32 *skip_cnt,
142 		     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
143 	             void *cb_arg);
144 #else
145 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
146 				   struct netlbl_audit *audit_info)
147 {
148 	return -ENOSYS;
149 }
150 
151 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
152 {
153 	return;
154 }
155 
156 static inline int cipso_v4_doi_remove(u32 doi,
157 				      struct netlbl_audit *audit_info)
158 {
159 	return 0;
160 }
161 
162 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
163 {
164 	return NULL;
165 }
166 
167 static 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 
174 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
175 					  const char *domain)
176 {
177 	return -ENOSYS;
178 }
179 
180 static 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
192 void cipso_v4_cache_invalidate(void);
193 int cipso_v4_cache_add(const struct sk_buff *skb,
194 		       const struct netlbl_lsm_secattr *secattr);
195 #else
196 static inline void cipso_v4_cache_invalidate(void)
197 {
198 	return;
199 }
200 
201 static 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
213 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
214 int cipso_v4_sock_setattr(struct sock *sk,
215 			  const struct cipso_v4_doi *doi_def,
216 			  const struct netlbl_lsm_secattr *secattr);
217 void cipso_v4_sock_delattr(struct sock *sk);
218 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
219 int cipso_v4_req_setattr(struct request_sock *req,
220 			 const struct cipso_v4_doi *doi_def,
221 			 const struct netlbl_lsm_secattr *secattr);
222 void cipso_v4_req_delattr(struct request_sock *req);
223 int cipso_v4_skbuff_setattr(struct sk_buff *skb,
224 			    const struct cipso_v4_doi *doi_def,
225 			    const struct netlbl_lsm_secattr *secattr);
226 int cipso_v4_skbuff_delattr(struct sk_buff *skb);
227 int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
228 			    struct netlbl_lsm_secattr *secattr);
229 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
230 #else
231 static inline void cipso_v4_error(struct sk_buff *skb,
232 				  int error,
233 				  u32 gateway)
234 {
235 	return;
236 }
237 
238 static 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 
245 static inline void cipso_v4_sock_delattr(struct sock *sk)
246 {
247 }
248 
249 static inline int cipso_v4_sock_getattr(struct sock *sk,
250 					struct netlbl_lsm_secattr *secattr)
251 {
252 	return -ENOSYS;
253 }
254 
255 static 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 
262 static inline void cipso_v4_req_delattr(struct request_sock *req)
263 {
264 	return;
265 }
266 
267 static 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 
274 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
275 {
276 	return -ENOSYS;
277 }
278 
279 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
280 					  struct netlbl_lsm_secattr *secattr)
281 {
282 	return -ENOSYS;
283 }
284 
285 static inline int cipso_v4_validate(const struct sk_buff *skb,
286 				    unsigned char **option)
287 {
288 	return -ENOSYS;
289 }
290 #endif /* CONFIG_NETLABEL */
291 
292 #endif /* _CIPSO_IPV4_H */
293