244 lines
9.3 KiB
C
244 lines
9.3 KiB
C
/*-
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* Copyright (c) 2001 Atsushi Onoe
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* Copyright (c) 2002-2008 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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*
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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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uint8_t wk_key[IEEE80211_KEYBUF_SIZE];
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};
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struct ieee80211_rsnparms {
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uint8_t rsn_mcastcipher; /* mcast/group cipher */
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uint8_t rsn_mcastkeylen; /* mcast key length */
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uint8_t rsn_ucastcipher; /* selected unicast cipher */
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uint8_t rsn_ucastkeylen; /* unicast key length */
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uint8_t rsn_keymgmt; /* selected key mgmt algo */
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uint16_t rsn_caps; /* capabilities */
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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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typedef uint16_t ieee80211_keyix; /* h/w key index */
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struct ieee80211_key {
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uint8_t wk_keylen; /* key length in bytes */
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uint8_t wk_pad;
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uint16_t wk_flags;
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#define IEEE80211_KEY_XMIT 0x0001 /* key used for xmit */
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#define IEEE80211_KEY_RECV 0x0002 /* key used for recv */
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#define IEEE80211_KEY_GROUP 0x0004 /* key used for WPA group operation */
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#define IEEE80211_KEY_SWENCRYPT 0x0010 /* host-based encrypt */
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#define IEEE80211_KEY_SWDECRYPT 0x0020 /* host-based decrypt */
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#define IEEE80211_KEY_SWENMIC 0x0040 /* host-based enmic */
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#define IEEE80211_KEY_SWDEMIC 0x0080 /* host-based demic */
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#define IEEE80211_KEY_DEVKEY 0x0100 /* device key request completed */
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#define IEEE80211_KEY_CIPHER0 0x1000 /* cipher-specific action 0 */
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#define IEEE80211_KEY_CIPHER1 0x2000 /* cipher-specific action 1 */
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ieee80211_keyix wk_keyix; /* h/w key index */
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ieee80211_keyix wk_rxkeyix; /* optional h/w rx key index */
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uint8_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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/* key receive sequence counter */
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uint64_t wk_keyrsc[IEEE80211_TID_SIZE];
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uint64_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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uint8_t wk_macaddr[IEEE80211_ADDR_LEN];
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};
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#define IEEE80211_KEY_COMMON /* common flags passed in by apps */\
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(IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV | IEEE80211_KEY_GROUP)
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#define IEEE80211_KEY_SWCRYPT \
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(IEEE80211_KEY_SWENCRYPT | IEEE80211_KEY_SWDECRYPT)
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#define IEEE80211_KEY_SWMIC (IEEE80211_KEY_SWENMIC | IEEE80211_KEY_SWDEMIC)
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#define IEEE80211_KEY_BITS \
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"\20\1XMIT\2RECV\3GROUP\4SWENCRYPT\5SWDECRYPT\6SWENMIC\7SWDEMIC" \
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"\10DEVKEY\11CIPHER0\12CIPHER1"
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#define IEEE80211_KEYIX_NONE ((ieee80211_keyix) -1)
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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. Beware that 4 is used
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* only to indicate h/w TKIP MIC support in driver capabilities;
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* there is no separate cipher support (it's rolled into the
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* TKIP cipher support).
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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_TKIPMIC 4 /* TKIP MIC capability */
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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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/* capability bits in ic_cryptocaps/iv_cryptocaps */
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#define IEEE80211_CRYPTO_WEP (1<<IEEE80211_CIPHER_WEP)
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#define IEEE80211_CRYPTO_TKIP (1<<IEEE80211_CIPHER_TKIP)
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#define IEEE80211_CRYPTO_AES_OCB (1<<IEEE80211_CIPHER_AES_OCB)
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#define IEEE80211_CRYPTO_AES_CCM (1<<IEEE80211_CIPHER_AES_CCM)
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#define IEEE80211_CRYPTO_TKIPMIC (1<<IEEE80211_CIPHER_TKIPMIC)
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#define IEEE80211_CRYPTO_CKIP (1<<IEEE80211_CIPHER_CKIP)
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#define IEEE80211_CRYPTO_BITS \
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"\20\1WEP\2TKIP\3AES\4AES_CCM\5TKIPMIC\6CKIP"
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#if defined(__KERNEL__) || defined(_KERNEL)
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struct ieee80211com;
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struct ieee80211vap;
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struct ieee80211_node;
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struct mbuf;
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MALLOC_DECLARE(M_80211_CRYPTO);
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void ieee80211_crypto_attach(struct ieee80211com *);
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void ieee80211_crypto_detach(struct ieee80211com *);
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void ieee80211_crypto_vattach(struct ieee80211vap *);
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void ieee80211_crypto_vdetach(struct ieee80211vap *);
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int ieee80211_crypto_newkey(struct ieee80211vap *,
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int cipher, int flags, struct ieee80211_key *);
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int ieee80211_crypto_delkey(struct ieee80211vap *,
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struct ieee80211_key *);
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int ieee80211_crypto_setkey(struct ieee80211vap *, struct ieee80211_key *);
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void ieee80211_crypto_delglobalkeys(struct ieee80211vap *);
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void ieee80211_crypto_reload_keys(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 ieee80211vap *, 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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uint8_t keyid);
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int (*ic_decap)(struct ieee80211_key *, struct mbuf *, int);
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int (*ic_enmic)(struct ieee80211_key *, struct mbuf *, int);
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int (*ic_demic)(struct ieee80211_key *, struct mbuf *, int);
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};
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extern const struct ieee80211_cipher ieee80211_cipher_none;
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#define IEEE80211_KEY_UNDEFINED(k) \
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((k)->wk_cipher == &ieee80211_cipher_none)
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void ieee80211_crypto_register(const struct ieee80211_cipher *);
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void ieee80211_crypto_unregister(const struct ieee80211_cipher *);
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int ieee80211_crypto_available(u_int cipher);
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struct ieee80211_key *ieee80211_crypto_encap(struct ieee80211_node *,
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struct mbuf *);
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struct ieee80211_key *ieee80211_crypto_decap(struct ieee80211_node *,
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struct mbuf *, int);
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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 ieee80211vap *vap, struct ieee80211_key *k,
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struct mbuf *m, int force)
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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, force) : 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 ieee80211vap *vap,
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struct ieee80211_key *k, struct mbuf *m, int force)
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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, force) : 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 ieee80211vap *vap,
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struct ieee80211_key *k, ieee80211_keyix 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(vap, k);
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k->wk_keyix = k->wk_rxkeyix = 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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void ieee80211_notify_replay_failure(struct ieee80211vap *,
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const struct ieee80211_frame *, const struct ieee80211_key *,
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uint64_t rsc, int tid);
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void ieee80211_notify_michael_failure(struct ieee80211vap *,
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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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