1 /*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 #ifndef _NET80211_IEEE80211_CRYPTO_H_ 29 #define _NET80211_IEEE80211_CRYPTO_H_ 30 31 /* 32 * 802.11 protocol crypto-related definitions. 33 */ 34 #define IEEE80211_KEYBUF_SIZE 16 35 #define IEEE80211_MICBUF_SIZE (8+8) /* space for both tx+rx keys */ 36 37 /* 38 * Old WEP-style key. Deprecated. 39 */ 40 struct ieee80211_wepkey { 41 u_int wk_len; /* key length in bytes */ 42 uint8_t wk_key[IEEE80211_KEYBUF_SIZE]; 43 }; 44 45 struct ieee80211_rsnparms { 46 uint8_t rsn_mcastcipher; /* mcast/group cipher */ 47 uint8_t rsn_mcastkeylen; /* mcast key length */ 48 uint8_t rsn_ucastcipher; /* selected unicast cipher */ 49 uint8_t rsn_ucastkeylen; /* unicast key length */ 50 uint8_t rsn_keymgmt; /* selected key mgmt algo */ 51 uint16_t rsn_caps; /* capabilities */ 52 }; 53 54 struct ieee80211_cipher; 55 56 /* 57 * Crypto key state. There is sufficient room for all supported 58 * ciphers (see below). The underlying ciphers are handled 59 * separately through loadable cipher modules that register with 60 * the generic crypto support. A key has a reference to an instance 61 * of the cipher; any per-key state is hung off wk_private by the 62 * cipher when it is attached. Ciphers are automatically called 63 * to detach and cleanup any such state when the key is deleted. 64 * 65 * The generic crypto support handles encap/decap of cipher-related 66 * frame contents for both hardware- and software-based implementations. 67 * A key requiring software crypto support is automatically flagged and 68 * the cipher is expected to honor this and do the necessary work. 69 * Ciphers such as TKIP may also support mixed hardware/software 70 * encrypt/decrypt and MIC processing. 71 */ 72 typedef uint16_t ieee80211_keyix; /* h/w key index */ 73 74 struct ieee80211_key { 75 uint8_t wk_keylen; /* key length in bytes */ 76 uint8_t wk_pad; /* .. some drivers use this. Fix that. */ 77 uint8_t wk_pad1[2]; 78 uint32_t wk_flags; 79 #define IEEE80211_KEY_XMIT 0x00000001 /* key used for xmit */ 80 #define IEEE80211_KEY_RECV 0x00000002 /* key used for recv */ 81 #define IEEE80211_KEY_GROUP 0x00000004 /* key used for WPA group operation */ 82 #define IEEE80211_KEY_NOREPLAY 0x00000008 /* ignore replay failures */ 83 #define IEEE80211_KEY_SWENCRYPT 0x00000010 /* host-based encrypt */ 84 #define IEEE80211_KEY_SWDECRYPT 0x00000020 /* host-based decrypt */ 85 #define IEEE80211_KEY_SWENMIC 0x00000040 /* host-based enmic */ 86 #define IEEE80211_KEY_SWDEMIC 0x00000080 /* host-based demic */ 87 #define IEEE80211_KEY_DEVKEY 0x00000100 /* device key request completed */ 88 #define IEEE80211_KEY_CIPHER0 0x00001000 /* cipher-specific action 0 */ 89 #define IEEE80211_KEY_CIPHER1 0x00002000 /* cipher-specific action 1 */ 90 #define IEEE80211_KEY_NOIV 0x00004000 /* don't insert IV/MIC for !mgmt */ 91 #define IEEE80211_KEY_NOIVMGT 0x00008000 /* don't insert IV/MIC for mgmt */ 92 #define IEEE80211_KEY_NOMIC 0x00010000 /* don't insert MIC for !mgmt */ 93 #define IEEE80211_KEY_NOMICMGT 0x00020000 /* don't insert MIC for mgmt */ 94 95 ieee80211_keyix wk_keyix; /* h/w key index */ 96 ieee80211_keyix wk_rxkeyix; /* optional h/w rx key index */ 97 uint8_t wk_key[IEEE80211_KEYBUF_SIZE+IEEE80211_MICBUF_SIZE]; 98 #define wk_txmic wk_key+IEEE80211_KEYBUF_SIZE+0 /* XXX can't () right */ 99 #define wk_rxmic wk_key+IEEE80211_KEYBUF_SIZE+8 /* XXX can't () right */ 100 /* key receive sequence counter */ 101 uint64_t wk_keyrsc[IEEE80211_TID_SIZE]; 102 uint64_t wk_keytsc; /* key transmit sequence counter */ 103 const struct ieee80211_cipher *wk_cipher; 104 void *wk_private; /* private cipher state */ 105 uint8_t wk_macaddr[IEEE80211_ADDR_LEN]; 106 }; 107 #define IEEE80211_KEY_COMMON /* common flags passed in by apps */\ 108 (IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV | IEEE80211_KEY_GROUP | \ 109 IEEE80211_KEY_NOREPLAY) 110 111 #define IEEE80211_KEY_SWCRYPT \ 112 (IEEE80211_KEY_SWENCRYPT | IEEE80211_KEY_SWDECRYPT) 113 #define IEEE80211_KEY_SWMIC (IEEE80211_KEY_SWENMIC | IEEE80211_KEY_SWDEMIC) 114 115 #define IEEE80211_KEY_DEVICE /* flags owned by device driver */\ 116 (IEEE80211_KEY_DEVKEY|IEEE80211_KEY_CIPHER0|IEEE80211_KEY_CIPHER1| \ 117 IEEE80211_KEY_SWCRYPT|IEEE80211_KEY_SWMIC|IEEE80211_KEY_NOIV | \ 118 IEEE80211_KEY_NOIVMGT|IEEE80211_KEY_NOMIC|IEEE80211_KEY_NOMICMGT) 119 120 #define IEEE80211_KEY_BITS \ 121 "\20\1XMIT\2RECV\3GROUP\4SWENCRYPT\5SWDECRYPT\6SWENMIC\7SWDEMIC" \ 122 "\10DEVKEY\11CIPHER0\12CIPHER1" 123 124 #define IEEE80211_KEYIX_NONE ((ieee80211_keyix) -1) 125 126 /* 127 * NB: these values are ordered carefully; there are lots of 128 * of implications in any reordering. Beware that 4 is used 129 * only to indicate h/w TKIP MIC support in driver capabilities; 130 * there is no separate cipher support (it's rolled into the 131 * TKIP cipher support). 132 */ 133 #define IEEE80211_CIPHER_WEP 0 134 #define IEEE80211_CIPHER_TKIP 1 135 #define IEEE80211_CIPHER_AES_OCB 2 136 #define IEEE80211_CIPHER_AES_CCM 3 137 #define IEEE80211_CIPHER_TKIPMIC 4 /* TKIP MIC capability */ 138 #define IEEE80211_CIPHER_CKIP 5 139 #define IEEE80211_CIPHER_NONE 6 /* pseudo value */ 140 141 #define IEEE80211_CIPHER_MAX (IEEE80211_CIPHER_NONE+1) 142 143 /* capability bits in ic_cryptocaps/iv_cryptocaps */ 144 #define IEEE80211_CRYPTO_WEP (1<<IEEE80211_CIPHER_WEP) 145 #define IEEE80211_CRYPTO_TKIP (1<<IEEE80211_CIPHER_TKIP) 146 #define IEEE80211_CRYPTO_AES_OCB (1<<IEEE80211_CIPHER_AES_OCB) 147 #define IEEE80211_CRYPTO_AES_CCM (1<<IEEE80211_CIPHER_AES_CCM) 148 #define IEEE80211_CRYPTO_TKIPMIC (1<<IEEE80211_CIPHER_TKIPMIC) 149 #define IEEE80211_CRYPTO_CKIP (1<<IEEE80211_CIPHER_CKIP) 150 151 #define IEEE80211_CRYPTO_BITS \ 152 "\20\1WEP\2TKIP\3AES\4AES_CCM\5TKIPMIC\6CKIP" 153 154 #if defined(__KERNEL__) || defined(_KERNEL) 155 156 struct ieee80211com; 157 struct ieee80211vap; 158 struct ieee80211_node; 159 struct mbuf; 160 161 MALLOC_DECLARE(M_80211_CRYPTO); 162 163 void ieee80211_crypto_attach(struct ieee80211com *); 164 void ieee80211_crypto_detach(struct ieee80211com *); 165 void ieee80211_crypto_vattach(struct ieee80211vap *); 166 void ieee80211_crypto_vdetach(struct ieee80211vap *); 167 int ieee80211_crypto_newkey(struct ieee80211vap *, 168 int cipher, int flags, struct ieee80211_key *); 169 int ieee80211_crypto_delkey(struct ieee80211vap *, 170 struct ieee80211_key *); 171 int ieee80211_crypto_setkey(struct ieee80211vap *, struct ieee80211_key *); 172 void ieee80211_crypto_delglobalkeys(struct ieee80211vap *); 173 void ieee80211_crypto_reload_keys(struct ieee80211com *); 174 void ieee80211_crypto_set_deftxkey(struct ieee80211vap *, 175 ieee80211_keyix kid); 176 177 /* 178 * Template for a supported cipher. Ciphers register with the 179 * crypto code and are typically loaded as separate modules 180 * (the null cipher is always present). 181 * XXX may need refcnts 182 */ 183 struct ieee80211_cipher { 184 const char *ic_name; /* printable name */ 185 u_int ic_cipher; /* IEEE80211_CIPHER_* */ 186 u_int ic_header; /* size of privacy header (bytes) */ 187 u_int ic_trailer; /* size of privacy trailer (bytes) */ 188 u_int ic_miclen; /* size of mic trailer (bytes) */ 189 void* (*ic_attach)(struct ieee80211vap *, struct ieee80211_key *); 190 void (*ic_detach)(struct ieee80211_key *); 191 int (*ic_setkey)(struct ieee80211_key *); 192 void (*ic_setiv)(struct ieee80211_key *, uint8_t *); 193 int (*ic_encap)(struct ieee80211_key *, struct mbuf *); 194 int (*ic_decap)(struct ieee80211_key *, struct mbuf *, int); 195 int (*ic_enmic)(struct ieee80211_key *, struct mbuf *, int); 196 int (*ic_demic)(struct ieee80211_key *, struct mbuf *, int); 197 }; 198 extern const struct ieee80211_cipher ieee80211_cipher_none; 199 200 #define IEEE80211_KEY_UNDEFINED(k) \ 201 ((k)->wk_cipher == &ieee80211_cipher_none) 202 203 void ieee80211_crypto_register(const struct ieee80211_cipher *); 204 void ieee80211_crypto_unregister(const struct ieee80211_cipher *); 205 int ieee80211_crypto_available(u_int cipher); 206 207 int ieee80211_crypto_get_key_wepidx(const struct ieee80211vap *, 208 const struct ieee80211_key *k); 209 uint8_t ieee80211_crypto_get_keyid(struct ieee80211vap *vap, 210 struct ieee80211_key *k); 211 struct ieee80211_key *ieee80211_crypto_get_txkey(struct ieee80211_node *, 212 struct mbuf *); 213 struct ieee80211_key *ieee80211_crypto_encap(struct ieee80211_node *, 214 struct mbuf *); 215 int ieee80211_crypto_decap(struct ieee80211_node *, 216 struct mbuf *, int, struct ieee80211_key **); 217 int ieee80211_crypto_demic(struct ieee80211vap *vap, struct ieee80211_key *k, 218 struct mbuf *, int); 219 /* 220 * Add any MIC. 221 */ 222 static __inline int 223 ieee80211_crypto_enmic(struct ieee80211vap *vap, 224 struct ieee80211_key *k, struct mbuf *m, int force) 225 { 226 const struct ieee80211_cipher *cip = k->wk_cipher; 227 return (cip->ic_miclen > 0 ? cip->ic_enmic(k, m, force) : 1); 228 } 229 230 /* 231 * Reset key state to an unused state. The crypto 232 * key allocation mechanism insures other state (e.g. 233 * key data) is properly setup before a key is used. 234 */ 235 static __inline void 236 ieee80211_crypto_resetkey(struct ieee80211vap *vap, 237 struct ieee80211_key *k, ieee80211_keyix ix) 238 { 239 k->wk_cipher = &ieee80211_cipher_none; 240 k->wk_private = k->wk_cipher->ic_attach(vap, k); 241 k->wk_keyix = k->wk_rxkeyix = ix; 242 k->wk_flags = IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV; 243 } 244 245 /* 246 * Crypt-related notification methods. 247 */ 248 void ieee80211_notify_replay_failure(struct ieee80211vap *, 249 const struct ieee80211_frame *, const struct ieee80211_key *, 250 uint64_t rsc, int tid); 251 void ieee80211_notify_michael_failure(struct ieee80211vap *, 252 const struct ieee80211_frame *, u_int keyix); 253 #endif /* defined(__KERNEL__) || defined(_KERNEL) */ 254 #endif /* _NET80211_IEEE80211_CRYPTO_H_ */ 255