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>
40 #include <linux/net.h>
41 #include <linux/skbuff.h>
42 #include <net/netlabel.h>
43 #include <net/request_sock.h>
44 #include <asm/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
cipso_v4_doi_add(struct cipso_v4_doi * doi_def,struct netlbl_audit * audit_info)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
cipso_v4_doi_free(struct cipso_v4_doi * doi_def)151 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
152 {
153 return;
154 }
155
cipso_v4_doi_remove(u32 doi,struct netlbl_audit * audit_info)156 static inline int cipso_v4_doi_remove(u32 doi,
157 struct netlbl_audit *audit_info)
158 {
159 return 0;
160 }
161
cipso_v4_doi_getdef(u32 doi)162 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
163 {
164 return NULL;
165 }
166
cipso_v4_doi_walk(u32 * skip_cnt,int (* callback)(struct cipso_v4_doi * doi_def,void * arg),void * cb_arg)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
cipso_v4_doi_domhsh_add(struct cipso_v4_doi * doi_def,const char * domain)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
cipso_v4_doi_domhsh_remove(struct cipso_v4_doi * doi_def,const char * domain)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
cipso_v4_cache_invalidate(void)196 static inline void cipso_v4_cache_invalidate(void)
197 {
198 return;
199 }
200
cipso_v4_cache_add(const struct sk_buff * skb,const struct netlbl_lsm_secattr * secattr)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
cipso_v4_error(struct sk_buff * skb,int error,u32 gateway)231 static inline void cipso_v4_error(struct sk_buff *skb,
232 int error,
233 u32 gateway)
234 {
235 return;
236 }
237
cipso_v4_sock_setattr(struct sock * sk,const struct cipso_v4_doi * doi_def,const struct netlbl_lsm_secattr * secattr)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
cipso_v4_sock_delattr(struct sock * sk)245 static inline void cipso_v4_sock_delattr(struct sock *sk)
246 {
247 }
248
cipso_v4_sock_getattr(struct sock * sk,struct netlbl_lsm_secattr * secattr)249 static inline int cipso_v4_sock_getattr(struct sock *sk,
250 struct netlbl_lsm_secattr *secattr)
251 {
252 return -ENOSYS;
253 }
254
cipso_v4_req_setattr(struct request_sock * req,const struct cipso_v4_doi * doi_def,const struct netlbl_lsm_secattr * secattr)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
cipso_v4_req_delattr(struct request_sock * req)262 static inline void cipso_v4_req_delattr(struct request_sock *req)
263 {
264 return;
265 }
266
cipso_v4_skbuff_setattr(struct sk_buff * skb,const struct cipso_v4_doi * doi_def,const struct netlbl_lsm_secattr * secattr)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
cipso_v4_skbuff_delattr(struct sk_buff * skb)274 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
275 {
276 return -ENOSYS;
277 }
278
cipso_v4_skbuff_getattr(const struct sk_buff * skb,struct netlbl_lsm_secattr * secattr)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
cipso_v4_validate(const struct sk_buff * skb,unsigned char ** option)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