1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2001 Atsushi Onoe 5 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 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 */ 40struct ieee80211_wepkey { 41 u_int wk_len; /* key length in bytes */ 42 uint8_t wk_key[IEEE80211_KEYBUF_SIZE]; 43}; 44 45struct 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 54struct 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 */ 72typedef uint16_t ieee80211_keyix; /* h/w key index */ 73 74struct 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#define IEEE80211_CIPHER_AES_CCM_256 7 141#define IEEE80211_CIPHER_BIP_CMAC_128 8 142#define IEEE80211_CIPHER_BIP_CMAC_256 9 143#define IEEE80211_CIPHER_BIP_GMAC_128 10 144#define IEEE80211_CIPHER_BIP_GMAC_256 11 145#define IEEE80211_CIPHER_AES_GCM_128 12 146#define IEEE80211_CIPHER_AES_GCM_256 13 147 148#define IEEE80211_CIPHER_LAST 13 149 150#define IEEE80211_CIPHER_MAX (IEEE80211_CIPHER_LAST+1) 151 152/* capability bits in ic_cryptocaps/iv_cryptocaps */ 153#define IEEE80211_CRYPTO_WEP (1<<IEEE80211_CIPHER_WEP) 154#define IEEE80211_CRYPTO_TKIP (1<<IEEE80211_CIPHER_TKIP) 155#define IEEE80211_CRYPTO_AES_OCB (1<<IEEE80211_CIPHER_AES_OCB) 156#define IEEE80211_CRYPTO_AES_CCM (1<<IEEE80211_CIPHER_AES_CCM) 157#define IEEE80211_CRYPTO_TKIPMIC (1<<IEEE80211_CIPHER_TKIPMIC) 158#define IEEE80211_CRYPTO_CKIP (1<<IEEE80211_CIPHER_CKIP) 159#define IEEE80211_CRYPTO_AES_CCM_256 (1<<IEEE80211_CIPHER_AES_CCM_256) 160#define IEEE80211_CRYPTO_BIP_CMAC_128 (1<<IEEE80211_CIPHER_BIP_CMAC_128) 161#define IEEE80211_CRYPTO_BIP_CMAC_256 (1<<IEEE80211_CIPHER_BIP_CMAC_256) 162#define IEEE80211_CRYPTO_BIP_GMAC_128 (1<<IEEE80211_CIPHER_BIP_GMAC_128) 163#define IEEE80211_CRYPTO_BIP_GMAC_256 (1<<IEEE80211_CIPHER_BIP_GMAC_256) 164#define IEEE80211_CRYPTO_AES_GCM_128 (1<<IEEE80211_CIPHER_AES_GCM_128) 165#define IEEE80211_CRYPTO_AES_GCM_256 (1<<IEEE80211_CIPHER_AES_GCM_256) 166 167#define IEEE80211_CRYPTO_BITS \ 168 "\20\1WEP\2TKIP\3AES\4AES_CCM\5TKIPMIC\6CKIP\10AES_CCM_256" \ 169 "\11BIP_CMAC_128\12BIP_CMAC_256\13BIP_GMAC_128\14BIP_CMAC_256" \ 170 "\15AES_GCM_128\16AES_GCM_256" 171 172#if defined(__KERNEL__) || defined(_KERNEL) 173 174struct ieee80211com; 175struct ieee80211vap; 176struct ieee80211_node; 177struct mbuf; 178 179MALLOC_DECLARE(M_80211_CRYPTO); 180 181void ieee80211_crypto_attach(struct ieee80211com *); 182void ieee80211_crypto_detach(struct ieee80211com *); 183void ieee80211_crypto_set_supported_software_ciphers(struct ieee80211com *, 184 uint32_t cipher_set); 185void ieee80211_crypto_set_supported_hardware_ciphers(struct ieee80211com *, 186 uint32_t cipher_set); 187void ieee80211_crypto_set_supported_driver_keymgmt(struct ieee80211com *, 188 uint32_t keymgmt_set); 189void ieee80211_crypto_vattach(struct ieee80211vap *); 190void ieee80211_crypto_vdetach(struct ieee80211vap *); 191int ieee80211_crypto_newkey(struct ieee80211vap *, 192 int cipher, int flags, struct ieee80211_key *); 193int ieee80211_crypto_delkey(struct ieee80211vap *, 194 struct ieee80211_key *); 195int ieee80211_crypto_setkey(struct ieee80211vap *, struct ieee80211_key *); 196void ieee80211_crypto_delglobalkeys(struct ieee80211vap *); 197void ieee80211_crypto_reload_keys(struct ieee80211com *); 198void ieee80211_crypto_set_deftxkey(struct ieee80211vap *, 199 ieee80211_keyix kid); 200 201/* 202 * Template for a supported cipher. Ciphers register with the 203 * crypto code and are typically loaded as separate modules 204 * (the null cipher is always present). 205 * XXX may need refcnts 206 */ 207struct ieee80211_cipher { 208 const char *ic_name; /* printable name */ 209 u_int ic_cipher; /* IEEE80211_CIPHER_* */ 210 u_int ic_header; /* size of privacy header (bytes) */ 211 u_int ic_trailer; /* size of privacy trailer (bytes) */ 212 u_int ic_miclen; /* size of mic trailer (bytes) */ 213 void* (*ic_attach)(struct ieee80211vap *, struct ieee80211_key *); 214 void (*ic_detach)(struct ieee80211_key *); 215 int (*ic_setkey)(struct ieee80211_key *); 216 void (*ic_setiv)(struct ieee80211_key *, uint8_t *); 217 int (*ic_encap)(struct ieee80211_key *, struct mbuf *); 218 int (*ic_decap)(struct ieee80211_key *, struct mbuf *, int); 219 int (*ic_enmic)(struct ieee80211_key *, struct mbuf *, int); 220 int (*ic_demic)(struct ieee80211_key *, struct mbuf *, int); 221}; 222extern const struct ieee80211_cipher ieee80211_cipher_none; 223 224#define IEEE80211_KEY_UNDEFINED(k) \ 225 ((k)->wk_cipher == &ieee80211_cipher_none) 226 227void ieee80211_crypto_register(const struct ieee80211_cipher *); 228void ieee80211_crypto_unregister(const struct ieee80211_cipher *); 229int ieee80211_crypto_available(u_int cipher); 230 231int ieee80211_crypto_get_key_wepidx(const struct ieee80211vap *, 232 const struct ieee80211_key *k); 233uint8_t ieee80211_crypto_get_keyid(struct ieee80211vap *vap, 234 struct ieee80211_key *k); 235struct ieee80211_key *ieee80211_crypto_get_txkey(struct ieee80211_node *, 236 struct mbuf *); 237struct ieee80211_key *ieee80211_crypto_encap(struct ieee80211_node *, 238 struct mbuf *); 239int ieee80211_crypto_decap(struct ieee80211_node *, 240 struct mbuf *, int, struct ieee80211_key **); 241int ieee80211_crypto_demic(struct ieee80211vap *vap, struct ieee80211_key *k, 242 struct mbuf *, int); 243/* 244 * Add any MIC. 245 */ 246static __inline int 247ieee80211_crypto_enmic(struct ieee80211vap *vap, 248 struct ieee80211_key *k, struct mbuf *m, int force) 249{ 250 const struct ieee80211_cipher *cip = k->wk_cipher; 251 return (cip->ic_miclen > 0 ? cip->ic_enmic(k, m, force) : 1); 252} 253 254/* 255 * Reset key state to an unused state. The crypto 256 * key allocation mechanism insures other state (e.g. 257 * key data) is properly setup before a key is used. 258 */ 259static __inline void 260ieee80211_crypto_resetkey(struct ieee80211vap *vap, 261 struct ieee80211_key *k, ieee80211_keyix ix) 262{ 263 k->wk_cipher = &ieee80211_cipher_none; 264 k->wk_private = k->wk_cipher->ic_attach(vap, k); 265 k->wk_keyix = k->wk_rxkeyix = ix; 266 k->wk_flags = IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV; 267} 268 269/* 270 * Crypt-related notification methods. 271 */ 272void ieee80211_notify_replay_failure(struct ieee80211vap *, 273 const struct ieee80211_frame *, const struct ieee80211_key *, 274 uint64_t rsc, int tid); 275void ieee80211_notify_michael_failure(struct ieee80211vap *, 276 const struct ieee80211_frame *, u_int keyix); 277#endif /* defined(__KERNEL__) || defined(_KERNEL) */ 278#endif /* _NET80211_IEEE80211_CRYPTO_H_ */ 279