6ee6d88916
it; instead pass the space occupied by the header down into the crypto modules (except in the demic case which needs it only when doing int in s/w) o while here fix defrag to strip the header from 2nd and later frames o teach decap code how to handle 4-address frames
225 lines
8.5 KiB
C
225 lines
8.5 KiB
C
/*-
|
|
* 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);
|
|
int (*ic_enmic)(struct ieee80211_key *, struct mbuf *, int);
|
|
int (*ic_demic)(struct ieee80211_key *, struct mbuf *, 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 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 *, int);
|
|
|
|
/*
|
|
* Check and remove any MIC.
|
|
*/
|
|
static __inline int
|
|
ieee80211_crypto_demic(struct ieee80211com *ic, struct ieee80211_key *k,
|
|
struct mbuf *m, int force)
|
|
{
|
|
const struct ieee80211_cipher *cip = k->wk_cipher;
|
|
return (cip->ic_miclen > 0 ? cip->ic_demic(k, m, force) : 1);
|
|
}
|
|
|
|
/*
|
|
* Add any MIC.
|
|
*/
|
|
static __inline int
|
|
ieee80211_crypto_enmic(struct ieee80211com *ic,
|
|
struct ieee80211_key *k, struct mbuf *m, int force)
|
|
{
|
|
const struct ieee80211_cipher *cip = k->wk_cipher;
|
|
return (cip->ic_miclen > 0 ? cip->ic_enmic(k, m, force) : 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_ */
|