/*- * 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. * * $Id$ */ #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 */ #define IEEE80211_TID_SIZE 17 /* total number of TIDs */ /* * 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_t; /* XXX pack better? */ /* XXX 48-bit rsc/tsc */ struct ieee80211_key { u_int8_t wk_keylen; /* key length in bytes */ u_int8_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_t wk_keyix; /* 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[IEEE80211_TID_SIZE]; /* 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_t)-1) #if defined(__KERNEL__) || defined(_KERNEL) struct ieee80211com; struct ieee80211vap; struct ieee80211_node; struct sk_buff; void ieee80211_crypto_attach(struct ieee80211com *); void ieee80211_crypto_detach(struct ieee80211com *); void ieee80211_crypto_vattach(struct ieee80211vap *); void ieee80211_crypto_vdetach(struct ieee80211vap *); int ieee80211_crypto_newkey(struct ieee80211vap *, int, int, struct ieee80211_key *); int ieee80211_crypto_delkey(struct ieee80211vap *, struct ieee80211_key *, struct ieee80211_node *); int ieee80211_crypto_setkey(struct ieee80211vap *, struct ieee80211_key *, const u_int8_t macaddr[IEEE80211_ADDR_LEN], struct ieee80211_node *); void ieee80211_crypto_delglobalkeys(struct ieee80211vap *); /* * 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 ieee80211vap *, struct ieee80211_key *); void (*ic_detach)(struct ieee80211_key *); int (*ic_setkey)(struct ieee80211_key *); int (*ic_encap)(struct ieee80211_key *, struct sk_buff *, u_int8_t); int (*ic_decap)(struct ieee80211_key *, struct sk_buff *, int); int (*ic_enmic)(struct ieee80211_key *, struct sk_buff *, int); int (*ic_demic)(struct ieee80211_key *, struct sk_buff *, int, int); }; extern const struct ieee80211_cipher ieee80211_cipher_none; void ieee80211_crypto_register(const struct ieee80211_cipher *); void ieee80211_crypto_unregister(const struct ieee80211_cipher *); int ieee80211_crypto_available(struct ieee80211vap*, u_int); struct ieee80211_key *ieee80211_crypto_encap(struct ieee80211_node *, struct sk_buff *); struct ieee80211_key *ieee80211_crypto_decap(struct ieee80211_node *, struct sk_buff *, int); /* * Check and remove any MIC. */ static __inline int ieee80211_crypto_demic(struct ieee80211vap *vap, struct ieee80211_key *k, struct sk_buff *skb, int hdrlen, int force_sw) { const struct ieee80211_cipher *cip = k->wk_cipher; return (cip->ic_miclen > 0 ? cip->ic_demic(k, skb, hdrlen, force_sw) : 1); } /* * Add any MIC. */ static __inline int ieee80211_crypto_enmic(struct ieee80211vap *vap, struct ieee80211_key *k, struct sk_buff *skb, int force_sw) { const struct ieee80211_cipher *cip = k->wk_cipher; return (cip->ic_miclen > 0 ? cip->ic_enmic(k, skb, force_sw) : 1); } /* * Reset key state to an unused state. The crypto * key allocation mechanism ensures other state (e.g. * key data) is properly setup before a key is used. */ static __inline void ieee80211_crypto_resetkey(struct ieee80211vap *vap, struct ieee80211_key *k, ieee80211_keyix_t ix) { k->wk_cipher = &ieee80211_cipher_none;; k->wk_private = k->wk_cipher->ic_attach(vap, k); k->wk_keyix = ix; k->wk_flags = IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV; } /* * Crypto-related notification methods. */ void ieee80211_notify_replay_failure(struct ieee80211vap *, const struct ieee80211_frame *, const struct ieee80211_key *, u_int64_t rsc); void ieee80211_notify_michael_failure(struct ieee80211vap *, const struct ieee80211_frame *, ieee80211_keyix_t keyix); #endif /* defined(__KERNEL__) || defined(_KERNEL) */ #endif /* _NET80211_IEEE80211_CRYPTO_H_ */