1 /*
2  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  */
5 
6 /*
7  * Copyright (c) 2001 Atsushi Onoe
8  * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 3. The name of the author may not be used to endorse or promote products
20  *    derived from this software without specific prior written permission.
21  *
22  * Alternatively, this software may be distributed under the terms of the
23  * GNU General Public License ("GPL") version 2 as published by the Free
24  * Software Foundation.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 #ifndef _SYS_NET80211_CRYPTO_H
39 #define	_SYS_NET80211_CRYPTO_H
40 
41 #include <sys/types.h>
42 #ifdef _KERNEL
43 #include <sys/stream.h>
44 #include <sys/mac.h>
45 #endif
46 #include <sys/net80211_proto.h>
47 
48 /*
49  * 802.11 protocol crypto-related definitions.
50  */
51 
52 #ifdef	__cplusplus
53 extern "C" {
54 #endif
55 
56 #define	IEEE80211_MAX_WPA_IE		40	/* IEEE802.11i */
57 /*
58  * Max size of optional information elements.  We artificially
59  * constrain this; it's limited only by the max frame size (and
60  * the max parameter size of the wireless extensions).
61  */
62 #define	IEEE80211_MAX_OPT_IE		256
63 
64 #define	IEEE80211_MLME_ASSOC		1	/* associate station */
65 #define	IEEE80211_MLME_DISASSOC		2	/* disassociate station */
66 #define	IEEE80211_MLME_DEAUTH		3	/* deauthenticate station */
67 #define	IEEE80211_MLME_AUTHORIZE	4	/* authorize station */
68 #define	IEEE80211_MLME_UNAUTHORIZE	5	/* unauthorize station */
69 
70 /*
71  * NB: these values are ordered carefully; there are lots of
72  * of implications in any reordering.
73  */
74 #define	IEEE80211_CIPHER_WEP		0
75 #define	IEEE80211_CIPHER_TKIP		1
76 #define	IEEE80211_CIPHER_AES_OCB	2
77 #define	IEEE80211_CIPHER_AES_CCM	3
78 #define	IEEE80211_CIPHER_CKIP		4
79 #define	IEEE80211_CIPHER_NONE		5	/* pseudo value */
80 
81 #define	IEEE80211_CIPHER_MAX		(IEEE80211_CIPHER_NONE+1)
82 
83 /*
84  * Maxmium length of key in bytes
85  * WEP key length present in the 802.11 standard is 40-bit.
86  * Many implementations also support 104-bit WEP keys.
87  * 802.11i standardize TKIP/CCMP use 128-bit key
88  */
89 #define	IEEE80211_KEYBUF_SIZE		16
90 #define	IEEE80211_MICBUF_SIZE		(8+8)	/* space for both tx+rx keys */
91 
92 /* Key Flags */
93 #define	IEEE80211_KEY_XMIT		0x01	/* key used for xmit */
94 #define	IEEE80211_KEY_RECV		0x02	/* key used for recv */
95 #define	IEEE80211_KEY_GROUP		/* key used for WPA group operation */ \
96 					0x04
97 #define	IEEE80211_KEY_SWCRYPT		0x10	/* host-based encrypt/decrypt */
98 #define	IEEE80211_KEY_SWMIC		0x20	/* host-based enmic/demic */
99 #define	IEEE80211_KEY_COMMON 		/* common flags passed in by apps */ \
100 	(IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV | IEEE80211_KEY_GROUP)
101 
102 #define	IEEE80211_KEY_DEFAULT		0x80	/* default xmit key */
103 
104 /* WEP */
105 #define	IEEE80211_WEP_KEYLEN		5	/* 40bit */
106 #define	IEEE80211_WEP_IVLEN		3	/* 24bit */
107 #define	IEEE80211_WEP_KIDLEN		1	/* 1 octet */
108 #define	IEEE80211_WEP_CRCLEN		4	/* CRC-32 */
109 #define	IEEE80211_WEP_NKID		4	/* number of key ids */
110 
111 /*
112  * 802.11i defines an extended IV for use with non-WEP ciphers.
113  * When the EXTIV bit is set in the key id byte an additional
114  * 4 bytes immediately follow the IV for TKIP.  For CCMP the
115  * EXTIV bit is likewise set but the 8 bytes represent the
116  * CCMP header rather than IV+extended-IV.
117  */
118 #define	IEEE80211_WEP_EXTIV		0x20
119 #define	IEEE80211_WEP_EXTIVLEN		4	/* extended IV length */
120 #define	IEEE80211_WEP_MICLEN		8	/* trailing MIC */
121 
122 #define	IEEE80211_WEP_HDRLEN					\
123 	(IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN)
124 #define	IEEE80211_WEP_MINLEN					\
125 	(sizeof (struct ieee80211_frame) +			\
126 	IEEE80211_WEP_HDRLEN + IEEE80211_WEP_CRCLEN)
127 
128 /* Maximum number of keys */
129 #define	IEEE80211_KEY_MAX		IEEE80211_WEP_NKID
130 
131 typedef uint16_t	ieee80211_keyix;	/* h/w key index */
132 
133 #define	IEEE80211_KEYIX_NONE	((ieee80211_keyix) -1)
134 
135 #ifdef _KERNEL
136 
137 struct ieee80211com;
138 struct ieee80211_key;
139 
140 /*
141  * Template for a supported cipher.  Ciphers register with the
142  * crypto code.
143  *
144  * ic_attach - Initialize cipher. The return value is set to wk_private
145  * ic_detach - Destruct a cipher.
146  * ic_setkey - Validate key contents
147  * ic_encap  - Encrypt the 802.11 MAC payload
148  * ic_decap  - Decrypt the 802.11 MAC payload
149  * ic_enmic  - Add MIC
150  * ic_demic  - Check and remove MIC
151  */
152 struct ieee80211_cipher {
153 	const char	*ic_name;	/* printable name */
154 	uint32_t	ic_cipher;	/* IEEE80211_CIPHER_* */
155 	uint32_t	ic_header;	/* size of privacy header (bytes) */
156 	uint32_t	ic_trailer;	/* size of privacy trailer (bytes) */
157 	uint32_t	ic_miclen;	/* size of mic trailer (bytes) */
158 	void		*(*ic_attach)(struct ieee80211com *,
159 				struct ieee80211_key *);
160 	void		(*ic_detach)(struct ieee80211_key *);
161 	int32_t		(*ic_setkey)(struct ieee80211_key *);
162 	int32_t		(*ic_encap)(struct ieee80211_key *, mblk_t *,
163 				uint8_t keyid);
164 	int32_t		(*ic_decap)(struct ieee80211_key *, mblk_t *, int);
165 	int32_t		(*ic_enmic)(struct ieee80211_key *, mblk_t *, int);
166 	int32_t		(*ic_demic)(struct ieee80211_key *, mblk_t *, int);
167 };
168 extern	const struct ieee80211_cipher ieee80211_cipher_none;
169 
170 struct ieee80211_key {
171 	uint8_t		wk_keylen;	/* key length in bytes */
172 	uint8_t		wk_pad;
173 	uint16_t	wk_flags;
174 	uint8_t		wk_key[IEEE80211_KEYBUF_SIZE+IEEE80211_MICBUF_SIZE];
175 	ieee80211_keyix	wk_keyix;	/* h/w key index */
176 	ieee80211_keyix	wk_rxkeyix;	/* optional h/w rx key index */
177 	uint64_t	wk_keyrsc;	/* key receive sequence counter */
178 	uint64_t	wk_keytsc;	/* key transmit sequence counter */
179 	const struct ieee80211_cipher	*wk_cipher;
180 	void		*wk_private;	/* private cipher state */
181 };
182 #define	wk_txmic	wk_key+IEEE80211_KEYBUF_SIZE+0
183 #define	wk_rxmic	wk_key+IEEE80211_KEYBUF_SIZE+8
184 
185 /*
186  * Crypto state kept in each ieee80211com.
187  */
188 struct ieee80211_crypto_state {
189 	struct ieee80211_key	cs_nw_keys[IEEE80211_KEY_MAX];
190 	ieee80211_keyix		cs_def_txkey;	/* default/group tx key index */
191 	uint16_t		cs_max_keyix;	/* max h/w key index */
192 
193 	int			(*cs_key_alloc)(struct ieee80211com *,
194 					const struct ieee80211_key *,
195 					ieee80211_keyix *, ieee80211_keyix *);
196 	int			(*cs_key_delete)(struct ieee80211com *,
197 					const struct ieee80211_key *);
198 	int			(*cs_key_set)(struct ieee80211com *,
199 					const struct ieee80211_key *,
200 					const uint8_t mac[IEEE80211_ADDR_LEN]);
201 	void			(*cs_key_update_begin)(struct ieee80211com *);
202 	void			(*cs_key_update_end)(struct ieee80211com *);
203 };
204 
205 /*
206  * Key update synchronization methods.
207  */
208 #define	KEY_UPDATE_BEGIN(ic)		\
209 	(ic)->ic_crypto.cs_key_update_begin(ic)
210 #define	KEY_UPDATE_END(ic)		\
211 	(ic)->ic_crypto.cs_key_update_end(ic)
212 #define	KEY_UNDEFINED(k)		\
213 	((k).wk_cipher == &ieee80211_cipher_none)
214 
215 #define	DEV_KEY_ALLOC(ic, k, kix, rkix) \
216 	(ic)->ic_crypto.cs_key_alloc(ic, k, kix, rkix)
217 #define	DEV_KEY_DELETE(ic, k)		\
218 	(ic)->ic_crypto.cs_key_delete(ic, k)
219 #define	DEV_KEY_SET(ic, k, m)		\
220 	(ic)->ic_crypto.cs_key_set(ic, k, m)
221 
222 #define	CIPHER_DETACH(k)		\
223 	(k)->wk_cipher->ic_detach(k)
224 #define	CIPHER_ATTACH(k)		\
225 	(k)->wk_cipher->ic_attach(k)
226 
227 #define	ieee80211_crypto_demic(ic, k, m, force)		\
228 	(((k)->wk_cipher->ic_miclen > 0) ?		\
229 	(k)->wk_cipher->ic_demic(k, m, force) :		\
230 	1)
231 
232 #define	ieee80211_crypto_enmic(ic, k, m, force)		\
233 	((k)->wk_cipher->ic_miclen > 0 ?		\
234 	(k)->wk_cipher->ic_enmic(k, m, force) :		\
235 	1)
236 
237 void ieee80211_crypto_attach(struct ieee80211com *ic);
238 void ieee80211_crypto_detach(struct ieee80211com *ic);
239 void ieee80211_crypto_register(struct ieee80211com *ic,
240     const struct ieee80211_cipher *);
241 void ieee80211_crypto_unregister(struct ieee80211com *ic,
242     const struct ieee80211_cipher *);
243 void ieee80211_crypto_resetkey(struct ieee80211com *, struct ieee80211_key *,
244 	ieee80211_keyix);
245 
246 #endif /* _KERNEL */
247 
248 #ifdef	__cplusplus
249 }
250 #endif
251 
252 #endif	/* _SYS_NET80211_CRYPTO_H */
253