/* $NetBSD: ieee80211_crypto.h,v 1.10 2006/11/16 01:33:40 christos Exp $ */ /*- * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD: src/sys/net80211/ieee80211_crypto.h,v 1.10 2005/08/08 18:46:35 sam Exp $ */ #ifndef _NET80211_IEEE80211_CRYPTO_H_ #define _NET80211_IEEE80211_CRYPTO_H_ /* * 802.11 protocol crypto-related definitions. */ #define IEEE80211_KEYBUF_SIZE 16 #define IEEE80211_MICBUF_SIZE (8+8) /* space for both tx+rx keys */ /* * Old WEP-style key. Deprecated. */ struct ieee80211_wepkey { u_int wk_len; /* key length in bytes */ u_int8_t wk_key[IEEE80211_KEYBUF_SIZE]; }; struct ieee80211_cipher; /* * Crypto key state. There is sufficient room for all supported * ciphers (see below). The underlying ciphers are handled * separately through loadable cipher modules that register with * the generic crypto support. A key has a reference to an instance * of the cipher; any per-key state is hung off wk_private by the * cipher when it is attached. Ciphers are automatically called * to detach and cleanup any such state when the key is deleted. * * The generic crypto support handles encap/decap of cipher-related * frame contents for both hardware- and software-based implementations. * A key requiring software crypto support is automatically flagged and * the cipher is expected to honor this and do the necessary work. * Ciphers such as TKIP may also support mixed hardware/software * encrypt/decrypt and MIC processing. */ typedef u_int16_t ieee80211_keyix; /* h/w key index */ struct ieee80211_key { u_int8_t wk_keylen; /* key length in bytes */ u_int8_t wk_pad; u_int16_t wk_flags; #define IEEE80211_KEY_XMIT 0x01 /* key used for xmit */ #define IEEE80211_KEY_RECV 0x02 /* key used for recv */ #define IEEE80211_KEY_GROUP 0x04 /* key used for WPA group operation */ #define IEEE80211_KEY_SWCRYPT 0x10 /* host-based encrypt/decrypt */ #define IEEE80211_KEY_SWMIC 0x20 /* host-based enmic/demic */ ieee80211_keyix wk_keyix; /* h/w key index */ ieee80211_keyix wk_rxkeyix; /* optional h/w rx key index */ u_int8_t wk_key[IEEE80211_KEYBUF_SIZE+IEEE80211_MICBUF_SIZE]; #define wk_txmic wk_key+IEEE80211_KEYBUF_SIZE+0 /* XXX can't () right */ #define wk_rxmic wk_key+IEEE80211_KEYBUF_SIZE+8 /* XXX can't () right */ u_int64_t wk_keyrsc; /* key receive sequence counter */ u_int64_t wk_keytsc; /* key transmit sequence counter */ const struct ieee80211_cipher *wk_cipher; void *wk_private; /* private cipher state */ }; #define IEEE80211_KEY_COMMON /* common flags passed in by apps */\ (IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV | IEEE80211_KEY_GROUP) /* * NB: these values are ordered carefully; there are lots of * of implications in any reordering. In particular beware * that 4 is not used to avoid conflicting with IEEE80211_F_PRIVACY. */ #define IEEE80211_CIPHER_WEP 0 #define IEEE80211_CIPHER_TKIP 1 #define IEEE80211_CIPHER_AES_OCB 2 #define IEEE80211_CIPHER_AES_CCM 3 #define IEEE80211_CIPHER_CKIP 5 #define IEEE80211_CIPHER_NONE 6 /* pseudo value */ #define IEEE80211_CIPHER_MAX (IEEE80211_CIPHER_NONE+1) #define IEEE80211_KEYIX_NONE ((ieee80211_keyix) -1) #define IEEE80211_KEY_UNDEFINED(k) ((k).wk_cipher == &ieee80211_cipher_none) #if defined(__KERNEL__) || defined(_KERNEL) struct ieee80211com; struct ieee80211_node; struct mbuf; /* * Crypto state kept in each ieee80211com. Some of this * can/should be shared when virtual AP's are supported. * * XXX save reference to ieee80211com to properly encapsulate state. * XXX split out crypto capabilities from ic_caps */ struct ieee80211_crypto_state { struct ieee80211_key cs_nw_keys[IEEE80211_WEP_NKID]; ieee80211_keyix cs_def_txkey; /* default/group tx key index */ u_int16_t cs_max_keyix; /* max h/w key index */ int (*cs_key_alloc)(struct ieee80211com *, const struct ieee80211_key *, ieee80211_keyix *, ieee80211_keyix *); int (*cs_key_delete)(struct ieee80211com *, const struct ieee80211_key *); int (*cs_key_set)(struct ieee80211com *, const struct ieee80211_key *, const u_int8_t mac[IEEE80211_ADDR_LEN]); void (*cs_key_update_begin)(struct ieee80211com *); void (*cs_key_update_end)(struct ieee80211com *); }; void ieee80211_crypto_attach(struct ieee80211com *); void ieee80211_crypto_detach(struct ieee80211com *); int ieee80211_crypto_newkey(struct ieee80211com *, int cipher, int flags, struct ieee80211_key *); int ieee80211_crypto_delkey(struct ieee80211com *, struct ieee80211_key *); int ieee80211_crypto_setkey(struct ieee80211com *, struct ieee80211_key *, const u_int8_t macaddr[IEEE80211_ADDR_LEN]); void ieee80211_crypto_delglobalkeys(struct ieee80211com *); /* * Template for a supported cipher. Ciphers register with the * crypto code and are typically loaded as separate modules * (the null cipher is always present). * XXX may need refcnts */ struct ieee80211_cipher { const char *ic_name; /* printable name */ u_int ic_cipher; /* IEEE80211_CIPHER_* */ u_int ic_header; /* size of privacy header (bytes) */ u_int ic_trailer; /* size of privacy trailer (bytes) */ u_int ic_miclen; /* size of mic trailer (bytes) */ void* (*ic_attach)(struct ieee80211com *, struct ieee80211_key *); void (*ic_detach)(struct ieee80211_key *); int (*ic_setkey)(struct ieee80211_key *); int (*ic_encap)(struct ieee80211_key *, struct mbuf *, u_int8_t keyid); int (*ic_decap)(struct ieee80211_key *, struct mbuf *, int); int (*ic_enmic)(struct ieee80211_key *, struct mbuf *, int); int (*ic_demic)(struct ieee80211_key *, struct mbuf *, int); }; extern const struct ieee80211_cipher ieee80211_cipher_none; extern const struct ieee80211_cipher ieee80211_cipher_wep; extern const struct ieee80211_cipher ieee80211_cipher_tkip; extern const struct ieee80211_cipher ieee80211_cipher_ccmp; void ieee80211_crypto_register(const struct ieee80211_cipher *); void ieee80211_crypto_unregister(const struct ieee80211_cipher *); int ieee80211_crypto_available(u_int cipher); struct ieee80211_key *ieee80211_crypto_encap(struct ieee80211com *, struct ieee80211_node *, struct mbuf *); struct ieee80211_key *ieee80211_crypto_decap(struct ieee80211com *, struct ieee80211_node *, struct mbuf *, int); /* * Check and remove any MIC. */ static __inline int ieee80211_crypto_demic(struct ieee80211com *ic, struct ieee80211_key *k, struct mbuf *m, int force) { const struct ieee80211_cipher *cip = k->wk_cipher; return (cip->ic_miclen > 0 ? cip->ic_demic(k, m, force) : 1); } /* * Add any MIC. */ static __inline int ieee80211_crypto_enmic(struct ieee80211com *ic, struct ieee80211_key *k, struct mbuf *m, int force) { const struct ieee80211_cipher *cip = k->wk_cipher; return (cip->ic_miclen > 0 ? cip->ic_enmic(k, m, force) : 1); } /* * Reset key state to an unused state. The crypto * key allocation mechanism insures other state (e.g. * key data) is properly setup before a key is used. */ static __inline void ieee80211_crypto_resetkey(struct ieee80211com *ic, struct ieee80211_key *k, ieee80211_keyix ix) { k->wk_cipher = &ieee80211_cipher_none;; k->wk_private = k->wk_cipher->ic_attach(ic, k); k->wk_keyix = k->wk_rxkeyix = ix; k->wk_flags = IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV; } /* * Crypt-related notification methods. */ void ieee80211_notify_replay_failure(struct ieee80211com *, const struct ieee80211_frame *, const struct ieee80211_key *, u_int64_t rsc); void ieee80211_notify_michael_failure(struct ieee80211com *, const struct ieee80211_frame *, u_int keyix); #endif /* defined(__KERNEL__) || defined(_KERNEL) */ #endif /* !_NET80211_IEEE80211_CRYPTO_H_ */