blob: a6fd939f202d39b0745e0a48ac350cbe9e795648 [file] [log] [blame]
Paul Moore11a03f72006-08-03 16:46:20 -07001/*
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 *
Paul Moore82c21bf2011-08-01 11:10:33 +000011 * Author: Paul Moore <paul@paul-moore.com>
Paul Moore11a03f72006-08-03 16:46:20 -070012 *
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
Jeff Kirshera6227e22013-12-06 09:13:40 -080029 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Paul Moore11a03f72006-08-03 16:46:20 -070030 *
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>
Paul Moore7a0e1d62006-08-29 17:56:04 -070039#include <linux/net.h>
40#include <linux/skbuff.h>
Paul Moore11a03f72006-08-03 16:46:20 -070041#include <net/netlabel.h>
Paul Moore389fb8002009-03-27 17:10:34 -040042#include <net/request_sock.h>
Arun Sharma600634972011-07-26 16:09:06 -070043#include <linux/atomic.h>
Paul Moore20e2a862012-06-01 05:54:56 +000044#include <asm/unaligned.h>
Paul Moore11a03f72006-08-03 16:46:20 -070045
46/* known doi values */
47#define CIPSO_V4_DOI_UNKNOWN 0x00000000
48
Paul Moore15c45f72008-10-10 10:16:34 -040049/* standard tag types */
Paul Moore11a03f72006-08-03 16:46:20 -070050#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
Paul Moore15c45f72008-10-10 10:16:34 -040057/* non-standard tag types (tags > 127) */
58#define CIPSO_V4_TAG_LOCAL 128
59
Paul Moore11a03f72006-08-03 16:46:20 -070060/* doi mapping types */
61#define CIPSO_V4_MAP_UNKNOWN 0
Paul Moore15c45f72008-10-10 10:16:34 -040062#define CIPSO_V4_MAP_TRANS 1
Paul Moore11a03f72006-08-03 16:46:20 -070063#define CIPSO_V4_MAP_PASS 2
Paul Moore15c45f72008-10-10 10:16:34 -040064#define CIPSO_V4_MAP_LOCAL 3
Paul Moore11a03f72006-08-03 16:46:20 -070065
66/* limits */
Paul Moorec6b16772006-11-17 17:38:51 -050067#define CIPSO_V4_MAX_REM_LVLS 255
Paul Moore11a03f72006-08-03 16:46:20 -070068#define CIPSO_V4_INV_LVL 0x80000000
69#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
Paul Moorec6b16772006-11-17 17:38:51 -050070#define CIPSO_V4_MAX_REM_CATS 65534
Paul Moore11a03f72006-08-03 16:46:20 -070071#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
80struct 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
Paul Mooreb1edeb12008-10-10 10:16:31 -040088 atomic_t refcount;
Paul Moore11a03f72006-08-03 16:46:20 -070089 struct list_head list;
90 struct rcu_head rcu;
Paul Moore11a03f72006-08-03 16:46:20 -070091};
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 */
97struct 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
117extern int cipso_v4_cache_enabled;
118extern int cipso_v4_cache_bucketsize;
119extern int cipso_v4_rbm_optfmt;
120extern 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)
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700128#define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso)
Paul Moore11a03f72006-08-03 16:46:20 -0700129
130/*
131 * DOI List Functions
132 */
133
134#ifdef CONFIG_NETLABEL
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500135int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
136 struct netlbl_audit *audit_info);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400137void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
138int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
Paul Moore11a03f72006-08-03 16:46:20 -0700139struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400140void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
Paul Moorefcd48282006-09-25 15:56:09 -0700141int cipso_v4_doi_walk(u32 *skip_cnt,
142 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
143 void *cb_arg);
Paul Moore11a03f72006-08-03 16:46:20 -0700144#else
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500145static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
146 struct netlbl_audit *audit_info)
Paul Moore11a03f72006-08-03 16:46:20 -0700147{
148 return -ENOSYS;
149}
150
Paul Mooreb1edeb12008-10-10 10:16:31 -0400151static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
152{
153 return;
154}
155
Paul Moore11a03f72006-08-03 16:46:20 -0700156static inline int cipso_v4_doi_remove(u32 doi,
Paul Mooreb1edeb12008-10-10 10:16:31 -0400157 struct netlbl_audit *audit_info)
Paul Moore11a03f72006-08-03 16:46:20 -0700158{
159 return 0;
160}
161
162static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
163{
164 return NULL;
165}
166
Paul Moorefcd48282006-09-25 15:56:09 -0700167static inline int cipso_v4_doi_walk(u32 *skip_cnt,
168 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
169 void *cb_arg)
Paul Moore11a03f72006-08-03 16:46:20 -0700170{
Paul Moorefcd48282006-09-25 15:56:09 -0700171 return 0;
Paul Moore11a03f72006-08-03 16:46:20 -0700172}
173
174static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
175 const char *domain)
176{
177 return -ENOSYS;
178}
179
180static 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
192void cipso_v4_cache_invalidate(void);
193int cipso_v4_cache_add(const struct sk_buff *skb,
194 const struct netlbl_lsm_secattr *secattr);
195#else
196static inline void cipso_v4_cache_invalidate(void)
197{
198 return;
199}
200
201static 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
213void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700214int cipso_v4_sock_setattr(struct sock *sk,
215 const struct cipso_v4_doi *doi_def,
216 const struct netlbl_lsm_secattr *secattr);
Paul Moore014ab192008-10-10 10:16:33 -0400217void cipso_v4_sock_delattr(struct sock *sk);
Paul Moore14a72f52006-09-25 15:52:01 -0700218int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
Paul Moore389fb8002009-03-27 17:10:34 -0400219int cipso_v4_req_setattr(struct request_sock *req,
220 const struct cipso_v4_doi *doi_def,
221 const struct netlbl_lsm_secattr *secattr);
222void cipso_v4_req_delattr(struct request_sock *req);
Paul Moore948bf852008-10-10 10:16:32 -0400223int cipso_v4_skbuff_setattr(struct sk_buff *skb,
224 const struct cipso_v4_doi *doi_def,
225 const struct netlbl_lsm_secattr *secattr);
226int cipso_v4_skbuff_delattr(struct sk_buff *skb);
Paul Moore11a03f72006-08-03 16:46:20 -0700227int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
228 struct netlbl_lsm_secattr *secattr);
Paul Moore15c45f72008-10-10 10:16:34 -0400229int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
Paul Moore11a03f72006-08-03 16:46:20 -0700230#else
231static inline void cipso_v4_error(struct sk_buff *skb,
232 int error,
233 u32 gateway)
234{
235 return;
236}
237
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700238static inline int cipso_v4_sock_setattr(struct sock *sk,
239 const struct cipso_v4_doi *doi_def,
240 const struct netlbl_lsm_secattr *secattr)
Paul Moore11a03f72006-08-03 16:46:20 -0700241{
242 return -ENOSYS;
243}
244
Paul Moore014ab192008-10-10 10:16:33 -0400245static inline void cipso_v4_sock_delattr(struct sock *sk)
246{
247}
248
Paul Moore14a72f52006-09-25 15:52:01 -0700249static inline int cipso_v4_sock_getattr(struct sock *sk,
250 struct netlbl_lsm_secattr *secattr)
251{
252 return -ENOSYS;
253}
254
Paul Moore389fb8002009-03-27 17:10:34 -0400255static 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
262static inline void cipso_v4_req_delattr(struct request_sock *req)
263{
264 return;
265}
266
Paul Moore948bf852008-10-10 10:16:32 -0400267static 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
274static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
275{
276 return -ENOSYS;
277}
278
Paul Moore11a03f72006-08-03 16:46:20 -0700279static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
280 struct netlbl_lsm_secattr *secattr)
281{
282 return -ENOSYS;
283}
284
Paul Moore15c45f72008-10-10 10:16:34 -0400285static inline int cipso_v4_validate(const struct sk_buff *skb,
286 unsigned char **option)
Paul Moore11a03f72006-08-03 16:46:20 -0700287{
Paul Moore20e2a862012-06-01 05:54:56 +0000288 unsigned char *opt = *option;
289 unsigned char err_offset = 0;
290 u8 opt_len = opt[1];
291 u8 opt_iter;
Seif Mazareebf2e5ddc2013-10-17 20:33:21 -0700292 u8 tag_len;
Paul Moore20e2a862012-06-01 05:54:56 +0000293
294 if (opt_len < 8) {
295 err_offset = 1;
296 goto out;
297 }
298
299 if (get_unaligned_be32(&opt[2]) == 0) {
300 err_offset = 2;
301 goto out;
302 }
303
304 for (opt_iter = 6; opt_iter < opt_len;) {
Seif Mazareebf2e5ddc2013-10-17 20:33:21 -0700305 tag_len = opt[opt_iter + 1];
Paul Moore10ae76f2013-12-10 15:00:50 -0500306 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
Paul Moore20e2a862012-06-01 05:54:56 +0000307 err_offset = opt_iter + 1;
308 goto out;
309 }
Seif Mazareebf2e5ddc2013-10-17 20:33:21 -0700310 opt_iter += tag_len;
Paul Moore20e2a862012-06-01 05:54:56 +0000311 }
312
313out:
314 *option = opt + err_offset;
315 return err_offset;
316
Paul Moore11a03f72006-08-03 16:46:20 -0700317}
318#endif /* CONFIG_NETLABEL */
319
320#endif /* _CIPSO_IPV4_H */