222 lines
8.3 KiB
C
222 lines
8.3 KiB
C
/*-
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* Copyright (c) 2001 Atsushi Onoe
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* Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _NET80211_IEEE80211_CRYPTO_H_
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#define _NET80211_IEEE80211_CRYPTO_H_
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/*
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* 802.11 protocol crypto-related definitions.
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*/
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#define IEEE80211_KEYBUF_SIZE 16
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#define IEEE80211_MICBUF_SIZE (8+8) /* space for both tx+rx keys */
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/*
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* Old WEP-style key. Deprecated.
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*/
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struct ieee80211_wepkey {
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u_int wk_len; /* key length in bytes */
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u_int8_t wk_key[IEEE80211_KEYBUF_SIZE];
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};
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struct ieee80211_cipher;
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/*
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* Crypto key state. There is sufficient room for all supported
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* ciphers (see below). The underlying ciphers are handled
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* separately through loadable cipher modules that register with
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* the generic crypto support. A key has a reference to an instance
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* of the cipher; any per-key state is hung off wk_private by the
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* cipher when it is attached. Ciphers are automatically called
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* to detach and cleanup any such state when the key is deleted.
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*
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* The generic crypto support handles encap/decap of cipher-related
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* frame contents for both hardware- and software-based implementations.
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* A key requiring software crypto support is automatically flagged and
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* the cipher is expected to honor this and do the necessary work.
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* Ciphers such as TKIP may also support mixed hardware/software
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* encrypt/decrypt and MIC processing.
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*/
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/* XXX need key index typedef */
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/* XXX pack better? */
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/* XXX 48-bit rsc/tsc */
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struct ieee80211_key {
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u_int8_t wk_keylen; /* key length in bytes */
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u_int8_t wk_flags;
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#define IEEE80211_KEY_XMIT 0x01 /* key used for xmit */
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#define IEEE80211_KEY_RECV 0x02 /* key used for recv */
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#define IEEE80211_KEY_SWCRYPT 0x04 /* host-based encrypt/decrypt */
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#define IEEE80211_KEY_SWMIC 0x08 /* host-based enmic/demic */
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u_int16_t wk_keyix; /* key index */
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u_int8_t wk_key[IEEE80211_KEYBUF_SIZE+IEEE80211_MICBUF_SIZE];
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#define wk_txmic wk_key+IEEE80211_KEYBUF_SIZE+0 /* XXX can't () right */
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#define wk_rxmic wk_key+IEEE80211_KEYBUF_SIZE+8 /* XXX can't () right */
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u_int64_t wk_keyrsc; /* key receive sequence counter */
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u_int64_t wk_keytsc; /* key transmit sequence counter */
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const struct ieee80211_cipher *wk_cipher;
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void *wk_private; /* private cipher state */
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};
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/*
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* NB: these values are ordered carefully; there are lots of
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* of implications in any reordering. In particular beware
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* that 4 is not used to avoid conflicting with IEEE80211_F_PRIVACY.
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*/
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#define IEEE80211_CIPHER_WEP 0
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#define IEEE80211_CIPHER_TKIP 1
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#define IEEE80211_CIPHER_AES_OCB 2
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#define IEEE80211_CIPHER_AES_CCM 3
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#define IEEE80211_CIPHER_CKIP 5
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#define IEEE80211_CIPHER_NONE 6 /* pseudo value */
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#define IEEE80211_CIPHER_MAX (IEEE80211_CIPHER_NONE+1)
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#define IEEE80211_KEYIX_NONE ((u_int16_t) -1)
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#if defined(__KERNEL__) || defined(_KERNEL)
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struct ieee80211com;
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struct ieee80211_node;
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struct mbuf;
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/*
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* Crypto state kept in each ieee80211com. Some of this
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* can/should be shared when virtual AP's are supported.
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*
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* XXX save reference to ieee80211com to properly encapsulate state.
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* XXX split out crypto capabilities from ic_caps
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*/
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struct ieee80211_crypto_state {
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struct ieee80211_key cs_nw_keys[IEEE80211_WEP_NKID];
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u_int16_t cs_def_txkey; /* default/group tx key index */
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int (*cs_key_alloc)(struct ieee80211com *,
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const struct ieee80211_key *);
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int (*cs_key_delete)(struct ieee80211com *,
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const struct ieee80211_key *);
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int (*cs_key_set)(struct ieee80211com *,
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const struct ieee80211_key *,
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const u_int8_t mac[IEEE80211_ADDR_LEN]);
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void (*cs_key_update_begin)(struct ieee80211com *);
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void (*cs_key_update_end)(struct ieee80211com *);
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};
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extern void ieee80211_crypto_attach(struct ieee80211com *);
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extern void ieee80211_crypto_detach(struct ieee80211com *);
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extern int ieee80211_crypto_newkey(struct ieee80211com *,
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int cipher, struct ieee80211_key *);
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extern int ieee80211_crypto_delkey(struct ieee80211com *,
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struct ieee80211_key *);
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extern int ieee80211_crypto_setkey(struct ieee80211com *,
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struct ieee80211_key *, const u_int8_t macaddr[IEEE80211_ADDR_LEN]);
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extern void ieee80211_crypto_delglobalkeys(struct ieee80211com *);
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/*
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* Template for a supported cipher. Ciphers register with the
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* crypto code and are typically loaded as separate modules
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* (the null cipher is always present).
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* XXX may need refcnts
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*/
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struct ieee80211_cipher {
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const char *ic_name; /* printable name */
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u_int ic_cipher; /* IEEE80211_CIPHER_* */
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u_int ic_header; /* size of privacy header (bytes) */
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u_int ic_trailer; /* size of privacy trailer (bytes) */
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u_int ic_miclen; /* size of mic trailer (bytes) */
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void* (*ic_attach)(struct ieee80211com *, struct ieee80211_key *);
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void (*ic_detach)(struct ieee80211_key *);
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int (*ic_setkey)(struct ieee80211_key *);
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int (*ic_encap)(struct ieee80211_key *, struct mbuf *,
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u_int8_t keyid);
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int (*ic_decap)(struct ieee80211_key *, struct mbuf *);
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int (*ic_enmic)(struct ieee80211_key *, struct mbuf *);
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int (*ic_demic)(struct ieee80211_key *, struct mbuf *);
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};
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extern const struct ieee80211_cipher ieee80211_cipher_none;
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extern void ieee80211_crypto_register(const struct ieee80211_cipher *);
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extern void ieee80211_crypto_unregister(const struct ieee80211_cipher *);
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extern int ieee80211_crypto_available(u_int cipher);
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extern struct ieee80211_key *ieee80211_crypto_encap(struct ieee80211com *,
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struct ieee80211_node *, struct mbuf *);
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extern struct ieee80211_key *ieee80211_crypto_decap(struct ieee80211com *,
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struct ieee80211_node *, struct mbuf *);
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/*
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* Check and remove any MIC.
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*/
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static __inline int
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ieee80211_crypto_demic(struct ieee80211com *ic, struct ieee80211_key *k,
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struct mbuf *m)
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{
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const struct ieee80211_cipher *cip = k->wk_cipher;
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return (cip->ic_miclen > 0 ? cip->ic_demic(k, m) : 1);
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}
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/*
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* Add any MIC.
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*/
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static __inline int
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ieee80211_crypto_enmic(struct ieee80211com *ic,
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struct ieee80211_key *k, struct mbuf *m)
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{
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const struct ieee80211_cipher *cip = k->wk_cipher;
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return (cip->ic_miclen > 0 ? cip->ic_enmic(k, m) : 1);
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}
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/*
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* Reset key state to an unused state. The crypto
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* key allocation mechanism insures other state (e.g.
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* key data) is properly setup before a key is used.
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*/
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static __inline void
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ieee80211_crypto_resetkey(struct ieee80211com *ic,
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struct ieee80211_key *k, u_int16_t ix)
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{
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k->wk_cipher = &ieee80211_cipher_none;;
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k->wk_private = k->wk_cipher->ic_attach(ic, k);
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k->wk_keyix = ix;
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k->wk_flags = IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV;
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}
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/*
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* Crypt-related notification methods.
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*/
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extern void ieee80211_notify_replay_failure(struct ieee80211com *,
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const struct ieee80211_frame *, const struct ieee80211_key *,
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u_int64_t rsc);
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extern void ieee80211_notify_michael_failure(struct ieee80211com *,
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const struct ieee80211_frame *, u_int keyix);
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#endif /* defined(__KERNEL__) || defined(_KERNEL) */
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#endif /* _NET80211_IEEE80211_CRYPTO_H_ */
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