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Thomas Gleixner1ccea772019-05-19 15:51:43 +02001/* SPDX-License-Identifier: GPL-2.0-or-later */
Paul Moore11a03f72006-08-03 16:46:20 -07002/*
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 *
Paul Moore82c21bf2011-08-01 11:10:33 +000012 * Author: Paul Moore <paul@paul-moore.com>
Paul Moore11a03f72006-08-03 16:46:20 -070013 */
14
15/*
16 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
Paul Moore11a03f72006-08-03 16:46:20 -070017 */
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>
Paul Moore7a0e1d62006-08-29 17:56:04 -070025#include <linux/net.h>
26#include <linux/skbuff.h>
Paul Moore11a03f72006-08-03 16:46:20 -070027#include <net/netlabel.h>
Paul Moore389fb8002009-03-27 17:10:34 -040028#include <net/request_sock.h>
Arun Sharma600634972011-07-26 16:09:06 -070029#include <linux/atomic.h>
Reshetova, Elenaf6a6fed2017-07-04 09:35:01 +030030#include <linux/refcount.h>
Paul Moore20e2a862012-06-01 05:54:56 +000031#include <asm/unaligned.h>
Paul Moore11a03f72006-08-03 16:46:20 -070032
33/* known doi values */
34#define CIPSO_V4_DOI_UNKNOWN 0x00000000
35
Paul Moore15c45f72008-10-10 10:16:34 -040036/* standard tag types */
Paul Moore11a03f72006-08-03 16:46:20 -070037#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
Paul Moore15c45f72008-10-10 10:16:34 -040044/* non-standard tag types (tags > 127) */
45#define CIPSO_V4_TAG_LOCAL 128
46
Paul Moore11a03f72006-08-03 16:46:20 -070047/* doi mapping types */
48#define CIPSO_V4_MAP_UNKNOWN 0
Paul Moore15c45f72008-10-10 10:16:34 -040049#define CIPSO_V4_MAP_TRANS 1
Paul Moore11a03f72006-08-03 16:46:20 -070050#define CIPSO_V4_MAP_PASS 2
Paul Moore15c45f72008-10-10 10:16:34 -040051#define CIPSO_V4_MAP_LOCAL 3
Paul Moore11a03f72006-08-03 16:46:20 -070052
53/* limits */
Paul Moorec6b16772006-11-17 17:38:51 -050054#define CIPSO_V4_MAX_REM_LVLS 255
Paul Moore11a03f72006-08-03 16:46:20 -070055#define CIPSO_V4_INV_LVL 0x80000000
56#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
Paul Moorec6b16772006-11-17 17:38:51 -050057#define CIPSO_V4_MAX_REM_CATS 65534
Paul Moore11a03f72006-08-03 16:46:20 -070058#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
67struct 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
Reshetova, Elenaf6a6fed2017-07-04 09:35:01 +030075 refcount_t refcount;
Paul Moore11a03f72006-08-03 16:46:20 -070076 struct list_head list;
77 struct rcu_head rcu;
Paul Moore11a03f72006-08-03 16:46:20 -070078};
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 */
84struct 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
104extern int cipso_v4_cache_enabled;
105extern int cipso_v4_cache_bucketsize;
106extern int cipso_v4_rbm_optfmt;
107extern int cipso_v4_rbm_strictvalid;
108#endif
109
110/*
Paul Moore11a03f72006-08-03 16:46:20 -0700111 * DOI List Functions
112 */
113
114#ifdef CONFIG_NETLABEL
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500115int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
116 struct netlbl_audit *audit_info);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400117void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
118int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
Paul Moore11a03f72006-08-03 16:46:20 -0700119struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400120void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
Paul Moorefcd48282006-09-25 15:56:09 -0700121int cipso_v4_doi_walk(u32 *skip_cnt,
122 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
123 void *cb_arg);
Paul Moore11a03f72006-08-03 16:46:20 -0700124#else
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500125static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
126 struct netlbl_audit *audit_info)
Paul Moore11a03f72006-08-03 16:46:20 -0700127{
128 return -ENOSYS;
129}
130
Paul Mooreb1edeb12008-10-10 10:16:31 -0400131static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
132{
133 return;
134}
135
Paul Moore11a03f72006-08-03 16:46:20 -0700136static inline int cipso_v4_doi_remove(u32 doi,
Paul Mooreb1edeb12008-10-10 10:16:31 -0400137 struct netlbl_audit *audit_info)
Paul Moore11a03f72006-08-03 16:46:20 -0700138{
139 return 0;
140}
141
142static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
143{
144 return NULL;
145}
146
Paul Moorefcd48282006-09-25 15:56:09 -0700147static inline int cipso_v4_doi_walk(u32 *skip_cnt,
148 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
149 void *cb_arg)
Paul Moore11a03f72006-08-03 16:46:20 -0700150{
Paul Moorefcd48282006-09-25 15:56:09 -0700151 return 0;
Paul Moore11a03f72006-08-03 16:46:20 -0700152}
Paul Moore11a03f72006-08-03 16:46:20 -0700153#endif /* CONFIG_NETLABEL */
154
155/*
156 * Label Mapping Cache Functions
157 */
158
159#ifdef CONFIG_NETLABEL
160void cipso_v4_cache_invalidate(void);
Paul Moore04f81f02015-02-11 14:46:37 -0500161int cipso_v4_cache_add(const unsigned char *cipso_ptr,
Paul Moore11a03f72006-08-03 16:46:20 -0700162 const struct netlbl_lsm_secattr *secattr);
163#else
164static inline void cipso_v4_cache_invalidate(void)
165{
166 return;
167}
168
Paul Moore04f81f02015-02-11 14:46:37 -0500169static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
Paul Moore11a03f72006-08-03 16:46:20 -0700170 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
181void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
Paul Moore04f81f02015-02-11 14:46:37 -0500182int cipso_v4_getattr(const unsigned char *cipso,
183 struct netlbl_lsm_secattr *secattr);
Paul Mooreba6ff9f22007-06-07 18:37:15 -0700184int cipso_v4_sock_setattr(struct sock *sk,
185 const struct cipso_v4_doi *doi_def,
186 const struct netlbl_lsm_secattr *secattr);
Paul Moore014ab192008-10-10 10:16:33 -0400187void cipso_v4_sock_delattr(struct sock *sk);
Paul Moore14a72f52006-09-25 15:52:01 -0700188int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
Paul Moore389fb8002009-03-27 17:10:34 -0400189int cipso_v4_req_setattr(struct request_sock *req,
190 const struct cipso_v4_doi *doi_def,
191 const struct netlbl_lsm_secattr *secattr);
192void cipso_v4_req_delattr(struct request_sock *req);
Paul Moore948bf852008-10-10 10:16:32 -0400193int cipso_v4_skbuff_setattr(struct sk_buff *skb,
194 const struct cipso_v4_doi *doi_def,
195 const struct netlbl_lsm_secattr *secattr);
196int cipso_v4_skbuff_delattr(struct sk_buff *skb);
Paul Moore11a03f72006-08-03 16:46:20 -0700197int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
198 struct netlbl_lsm_secattr *secattr);
Paul Moore04f81f02015-02-11 14:46:37 -0500199unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
Paul Moore15c45f72008-10-10 10:16:34 -0400200int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
Paul Moore11a03f72006-08-03 16:46:20 -0700201#else
202static inline void cipso_v4_error(struct sk_buff *skb,
203 int error,
204 u32 gateway)
205{
206 return;
207}
208
Paul Moore04f81f02015-02-11 14:46:37 -0500209static inline int cipso_v4_getattr(const unsigned char *cipso,
210 struct netlbl_lsm_secattr *secattr)
211{
212 return -ENOSYS;
213}
214
Paul Mooreba6ff9f22007-06-07 18:37:15 -0700215static inline int cipso_v4_sock_setattr(struct sock *sk,
216 const struct cipso_v4_doi *doi_def,
217 const struct netlbl_lsm_secattr *secattr)
Paul Moore11a03f72006-08-03 16:46:20 -0700218{
219 return -ENOSYS;
220}
221
Paul Moore014ab192008-10-10 10:16:33 -0400222static inline void cipso_v4_sock_delattr(struct sock *sk)
223{
224}
225
Paul Moore14a72f52006-09-25 15:52:01 -0700226static inline int cipso_v4_sock_getattr(struct sock *sk,
227 struct netlbl_lsm_secattr *secattr)
228{
229 return -ENOSYS;
230}
231
Paul Moore389fb8002009-03-27 17:10:34 -0400232static 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
239static inline void cipso_v4_req_delattr(struct request_sock *req)
240{
241 return;
242}
243
Paul Moore948bf852008-10-10 10:16:32 -0400244static 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
251static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
252{
253 return -ENOSYS;
254}
255
Paul Moore11a03f72006-08-03 16:46:20 -0700256static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
257 struct netlbl_lsm_secattr *secattr)
258{
259 return -ENOSYS;
260}
261
Paul Moore04f81f02015-02-11 14:46:37 -0500262static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
263{
264 return NULL;
265}
266
Paul Moore15c45f72008-10-10 10:16:34 -0400267static inline int cipso_v4_validate(const struct sk_buff *skb,
268 unsigned char **option)
Paul Moore11a03f72006-08-03 16:46:20 -0700269{
Paul Moore20e2a862012-06-01 05:54:56 +0000270 unsigned char *opt = *option;
271 unsigned char err_offset = 0;
272 u8 opt_len = opt[1];
273 u8 opt_iter;
Seif Mazareebf2e5ddc2013-10-17 20:33:21 -0700274 u8 tag_len;
Paul Moore20e2a862012-06-01 05:54:56 +0000275
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;) {
Eric Dumazetd71b7892017-02-03 00:03:26 -0800287 if (opt_iter + 1 == opt_len) {
288 err_offset = opt_iter;
289 goto out;
290 }
Seif Mazareebf2e5ddc2013-10-17 20:33:21 -0700291 tag_len = opt[opt_iter + 1];
Paul Moore10ae76f2013-12-10 15:00:50 -0500292 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
Paul Moore20e2a862012-06-01 05:54:56 +0000293 err_offset = opt_iter + 1;
294 goto out;
295 }
Seif Mazareebf2e5ddc2013-10-17 20:33:21 -0700296 opt_iter += tag_len;
Paul Moore20e2a862012-06-01 05:54:56 +0000297 }
298
299out:
300 *option = opt + err_offset;
301 return err_offset;
302
Paul Moore11a03f72006-08-03 16:46:20 -0700303}
304#endif /* CONFIG_NETLABEL */
305
306#endif /* _CIPSO_IPV4_H */