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- /*-
- * 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: ieee80211_crypto.h 1441 2006-02-06 16:03:21Z mrenzmann $
- */
- #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.
- */
- /* XXX need key index typedef */
- /* 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 */
- u_int16_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 ((u_int16_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);
- };
- 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(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)
- {
- const struct ieee80211_cipher *cip = k->wk_cipher;
- return (cip->ic_miclen > 0 ? cip->ic_demic(k, skb, hdrlen) : 1);
- }
-
- /*
- * Add any MIC.
- */
- static __inline int
- ieee80211_crypto_enmic(struct ieee80211vap *vap, struct ieee80211_key *k,
- struct sk_buff *skb, int force)
- {
- const struct ieee80211_cipher *cip = k->wk_cipher;
- return (cip->ic_miclen > 0 ? cip->ic_enmic(k, skb, force) : 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,
- u_int16_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 *, u_int keyix);
- #endif /* defined(__KERNEL__) || defined(_KERNEL) */
- #endif /* _NET80211_IEEE80211_CRYPTO_H_ */
-