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
cipso_v4_doi_add(struct cipso_v4_doi * doi_def,struct netlbl_audit * audit_info)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
cipso_v4_doi_free(struct cipso_v4_doi * doi_def)131 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
132 {
133 return;
134 }
135
cipso_v4_doi_remove(u32 doi,struct netlbl_audit * audit_info)136 static inline int cipso_v4_doi_remove(u32 doi,
137 struct netlbl_audit *audit_info)
138 {
139 return 0;
140 }
141
cipso_v4_doi_getdef(u32 doi)142 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
143 {
144 return NULL;
145 }
146
cipso_v4_doi_walk(u32 * skip_cnt,int (* callback)(struct cipso_v4_doi * doi_def,void * arg),void * cb_arg)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 #endif /* CONFIG_NETLABEL */
154
155 /*
156 * Label Mapping Cache Functions
157 */
158
159 #ifdef CONFIG_NETLABEL
160 void cipso_v4_cache_invalidate(void);
161 int cipso_v4_cache_add(const unsigned char *cipso_ptr,
162 const struct netlbl_lsm_secattr *secattr);
163 #else
cipso_v4_cache_invalidate(void)164 static inline void cipso_v4_cache_invalidate(void)
165 {
166 return;
167 }
168
cipso_v4_cache_add(const unsigned char * cipso_ptr,const struct netlbl_lsm_secattr * secattr)169 static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
170 const struct netlbl_lsm_secattr *secattr)
171 {
172 return 0;
173 }
174 #endif /* CONFIG_NETLABEL */
175
176 /*
177 * Protocol Handling Functions
178 */
179
180 #ifdef CONFIG_NETLABEL
181 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
182 int cipso_v4_getattr(const unsigned char *cipso,
183 struct netlbl_lsm_secattr *secattr);
184 int cipso_v4_sock_setattr(struct sock *sk,
185 const struct cipso_v4_doi *doi_def,
186 const struct netlbl_lsm_secattr *secattr);
187 void cipso_v4_sock_delattr(struct sock *sk);
188 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
189 int cipso_v4_req_setattr(struct request_sock *req,
190 const struct cipso_v4_doi *doi_def,
191 const struct netlbl_lsm_secattr *secattr);
192 void cipso_v4_req_delattr(struct request_sock *req);
193 int cipso_v4_skbuff_setattr(struct sk_buff *skb,
194 const struct cipso_v4_doi *doi_def,
195 const struct netlbl_lsm_secattr *secattr);
196 int cipso_v4_skbuff_delattr(struct sk_buff *skb);
197 int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
198 struct netlbl_lsm_secattr *secattr);
199 unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
200 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
201 #else
cipso_v4_error(struct sk_buff * skb,int error,u32 gateway)202 static inline void cipso_v4_error(struct sk_buff *skb,
203 int error,
204 u32 gateway)
205 {
206 return;
207 }
208
cipso_v4_getattr(const unsigned char * cipso,struct netlbl_lsm_secattr * secattr)209 static inline int cipso_v4_getattr(const unsigned char *cipso,
210 struct netlbl_lsm_secattr *secattr)
211 {
212 return -ENOSYS;
213 }
214
cipso_v4_sock_setattr(struct sock * sk,const struct cipso_v4_doi * doi_def,const struct netlbl_lsm_secattr * secattr)215 static inline int cipso_v4_sock_setattr(struct sock *sk,
216 const struct cipso_v4_doi *doi_def,
217 const struct netlbl_lsm_secattr *secattr)
218 {
219 return -ENOSYS;
220 }
221
cipso_v4_sock_delattr(struct sock * sk)222 static inline void cipso_v4_sock_delattr(struct sock *sk)
223 {
224 }
225
cipso_v4_sock_getattr(struct sock * sk,struct netlbl_lsm_secattr * secattr)226 static inline int cipso_v4_sock_getattr(struct sock *sk,
227 struct netlbl_lsm_secattr *secattr)
228 {
229 return -ENOSYS;
230 }
231
cipso_v4_req_setattr(struct request_sock * req,const struct cipso_v4_doi * doi_def,const struct netlbl_lsm_secattr * secattr)232 static inline int cipso_v4_req_setattr(struct request_sock *req,
233 const struct cipso_v4_doi *doi_def,
234 const struct netlbl_lsm_secattr *secattr)
235 {
236 return -ENOSYS;
237 }
238
cipso_v4_req_delattr(struct request_sock * req)239 static inline void cipso_v4_req_delattr(struct request_sock *req)
240 {
241 return;
242 }
243
cipso_v4_skbuff_setattr(struct sk_buff * skb,const struct cipso_v4_doi * doi_def,const struct netlbl_lsm_secattr * secattr)244 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
245 const struct cipso_v4_doi *doi_def,
246 const struct netlbl_lsm_secattr *secattr)
247 {
248 return -ENOSYS;
249 }
250
cipso_v4_skbuff_delattr(struct sk_buff * skb)251 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
252 {
253 return -ENOSYS;
254 }
255
cipso_v4_skbuff_getattr(const struct sk_buff * skb,struct netlbl_lsm_secattr * secattr)256 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
257 struct netlbl_lsm_secattr *secattr)
258 {
259 return -ENOSYS;
260 }
261
cipso_v4_optptr(const struct sk_buff * skb)262 static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
263 {
264 return NULL;
265 }
266
cipso_v4_validate(const struct sk_buff * skb,unsigned char ** option)267 static inline int cipso_v4_validate(const struct sk_buff *skb,
268 unsigned char **option)
269 {
270 unsigned char *opt = *option;
271 unsigned char err_offset = 0;
272 u8 opt_len = opt[1];
273 u8 opt_iter;
274 u8 tag_len;
275
276 if (opt_len < 8) {
277 err_offset = 1;
278 goto out;
279 }
280
281 if (get_unaligned_be32(&opt[2]) == 0) {
282 err_offset = 2;
283 goto out;
284 }
285
286 for (opt_iter = 6; opt_iter < opt_len;) {
287 if (opt_iter + 1 == opt_len) {
288 err_offset = opt_iter;
289 goto out;
290 }
291 tag_len = opt[opt_iter + 1];
292 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
293 err_offset = opt_iter + 1;
294 goto out;
295 }
296 opt_iter += tag_len;
297 }
298
299 out:
300 *option = opt + err_offset;
301 return err_offset;
302
303 }
304 #endif /* CONFIG_NETLABEL */
305
306 #endif /* _CIPSO_IPV4_H */
307