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freebsd-dev/sys/net80211/ieee80211_crypto.h
sam 035f2a0059 Revise crypto api lightly to improve group key handling: 
o don't pre-assign key index to the global key table entries so device
  has a chance to decide what to use
o make ieee80211_crypto_newkey take the desired flags as an argument
  instead of wacking the key structure directly; this eliminates a
  bunch of code warts
o add a new flag IEEE80211_KEY_GROUP to indicate a key is a WPA Group
  key so devices don't need to guess (temporarily add this flag in the
  ioctl code until we can get wpa_supplicant+hostapd updated)
o shuffle IEEE80211_KEY_* bits to move flags used internally to the high
  nibble of the flags word

Reviewed by:	Tai-hwa Liang
2005-04-12 17:55:13 +00:00

225 lines
8.4 KiB
C
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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.
*
* $FreeBSD$
*/
#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.
*/
/* 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; /* 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 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];
u_int16_t cs_def_txkey; /* default/group tx key index */
int (*cs_key_alloc)(struct ieee80211com *,
const struct ieee80211_key *);
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 (*ic_enmic)(struct ieee80211_key *, struct mbuf *);
int (*ic_demic)(struct ieee80211_key *, struct mbuf *);
};
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 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 *);
/*
* Check and remove any MIC.
*/
static __inline int
ieee80211_crypto_demic(struct ieee80211com *ic, struct ieee80211_key *k,
struct mbuf *m)
{
const struct ieee80211_cipher *cip = k->wk_cipher;
return (cip->ic_miclen > 0 ? cip->ic_demic(k, m) : 1);
}
/*
* Add any MIC.
*/
static __inline int
ieee80211_crypto_enmic(struct ieee80211com *ic,
struct ieee80211_key *k, struct mbuf *m)
{
const struct ieee80211_cipher *cip = k->wk_cipher;
return (cip->ic_miclen > 0 ? cip->ic_enmic(k, m) : 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, u_int16_t ix)
{
k->wk_cipher = &ieee80211_cipher_none;;
k->wk_private = k->wk_cipher->ic_attach(ic, k);
k->wk_keyix = 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_ */
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