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freebsd-skq/sys/net80211/ieee80211_crypto.h
adrian 7cd2afe28b [net80211] begin fleshing out new hardware crypto offload features. 
* extend the keycache flag word to be 32 bits, not 16 bits
* add new key flags for transmit:
  + IEEE80211_KEY_NOIV: Don't insert IV in the payload when transmitting data frames;
  + IEEE80211_KEY_NOIVMGT:  Don't insert IV in the payload when transmitting MIC frames;
  + IEEE80211_KEY_NOMIC: Don't insert MIC in the payload when transmitting data frames;
  + IEEE80211_KEY_NOMICMGT: don't insert MIC in the payload when transmitting management
    frames.

* teach ieee80211_crypto_demic() about hardware decrypted frames:
  + if frames are hardware decrypted and the frame has failed MIC, treat it as a
     michael failure.
  + if frames are hardware decrypted and the frame has stripped MIC, we can't check the
    MIC in the payload - we don't have anything to compare it against.

This is only part of the work required to successfully transmit/receive
hardware crypto frames such as the qualcomm atheros 11ac offload chips.

There will be further work in the transmit and receive path before this
can be done by default.

Reviewed by:	avos
Differential Revision:	https://reviews.freebsd.org/D8364
2016-11-05 22:41:22 +00:00

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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2008 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.
*
* 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 */
uint8_t wk_key[IEEE80211_KEYBUF_SIZE];
};
struct ieee80211_rsnparms {
uint8_t rsn_mcastcipher; /* mcast/group cipher */
uint8_t rsn_mcastkeylen; /* mcast key length */
uint8_t rsn_ucastcipher; /* selected unicast cipher */
uint8_t rsn_ucastkeylen; /* unicast key length */
uint8_t rsn_keymgmt; /* selected key mgmt algo */
uint16_t rsn_caps; /* capabilities */
};
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.
*/
typedef uint16_t ieee80211_keyix; /* h/w key index */
struct ieee80211_key {
uint8_t wk_keylen; /* key length in bytes */
uint8_t wk_pad; /* .. some drivers use this. Fix that. */
uint8_t wk_pad1[2];
uint32_t wk_flags;
#define IEEE80211_KEY_XMIT 0x00000001 /* key used for xmit */
#define IEEE80211_KEY_RECV 0x00000002 /* key used for recv */
#define IEEE80211_KEY_GROUP 0x00000004 /* key used for WPA group operation */
#define IEEE80211_KEY_NOREPLAY 0x00000008 /* ignore replay failures */
#define IEEE80211_KEY_SWENCRYPT 0x00000010 /* host-based encrypt */
#define IEEE80211_KEY_SWDECRYPT 0x00000020 /* host-based decrypt */
#define IEEE80211_KEY_SWENMIC 0x00000040 /* host-based enmic */
#define IEEE80211_KEY_SWDEMIC 0x00000080 /* host-based demic */
#define IEEE80211_KEY_DEVKEY 0x00000100 /* device key request completed */
#define IEEE80211_KEY_CIPHER0 0x00001000 /* cipher-specific action 0 */
#define IEEE80211_KEY_CIPHER1 0x00002000 /* cipher-specific action 1 */
#define IEEE80211_KEY_NOIV 0x00004000 /* don't insert IV/MIC for !mgmt */
#define IEEE80211_KEY_NOIVMGT 0x00008000 /* don't insert IV/MIC for mgmt */
#define IEEE80211_KEY_NOMIC 0x00010000 /* don't insert MIC for !mgmt */
#define IEEE80211_KEY_NOMICMGT 0x00020000 /* don't insert MIC for mgmt */
ieee80211_keyix wk_keyix; /* h/w key index */
ieee80211_keyix wk_rxkeyix; /* optional h/w rx key index */
uint8_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 */
/* key receive sequence counter */
uint64_t wk_keyrsc[IEEE80211_TID_SIZE];
uint64_t wk_keytsc; /* key transmit sequence counter */
const struct ieee80211_cipher *wk_cipher;
void *wk_private; /* private cipher state */
uint8_t wk_macaddr[IEEE80211_ADDR_LEN];
};
#define IEEE80211_KEY_COMMON /* common flags passed in by apps */\
(IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV | IEEE80211_KEY_GROUP | \
IEEE80211_KEY_NOREPLAY)
#define IEEE80211_KEY_SWCRYPT \
(IEEE80211_KEY_SWENCRYPT | IEEE80211_KEY_SWDECRYPT)
#define IEEE80211_KEY_SWMIC (IEEE80211_KEY_SWENMIC | IEEE80211_KEY_SWDEMIC)
#define IEEE80211_KEY_DEVICE /* flags owned by device driver */\
(IEEE80211_KEY_DEVKEY|IEEE80211_KEY_CIPHER0|IEEE80211_KEY_CIPHER1| \
IEEE80211_KEY_SWCRYPT|IEEE80211_KEY_SWMIC)
#define IEEE80211_KEY_BITS \
"\20\1XMIT\2RECV\3GROUP\4SWENCRYPT\5SWDECRYPT\6SWENMIC\7SWDEMIC" \
"\10DEVKEY\11CIPHER0\12CIPHER1"
#define IEEE80211_KEYIX_NONE ((ieee80211_keyix) -1)
/*
* NB: these values are ordered carefully; there are lots of
* of implications in any reordering. Beware that 4 is used
* only to indicate h/w TKIP MIC support in driver capabilities;
* there is no separate cipher support (it's rolled into the
* TKIP cipher support).
*/
#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_TKIPMIC 4 /* TKIP MIC capability */
#define IEEE80211_CIPHER_CKIP 5
#define IEEE80211_CIPHER_NONE 6 /* pseudo value */
#define IEEE80211_CIPHER_MAX (IEEE80211_CIPHER_NONE+1)
/* capability bits in ic_cryptocaps/iv_cryptocaps */
#define IEEE80211_CRYPTO_WEP (1<<IEEE80211_CIPHER_WEP)
#define IEEE80211_CRYPTO_TKIP (1<<IEEE80211_CIPHER_TKIP)
#define IEEE80211_CRYPTO_AES_OCB (1<<IEEE80211_CIPHER_AES_OCB)
#define IEEE80211_CRYPTO_AES_CCM (1<<IEEE80211_CIPHER_AES_CCM)
#define IEEE80211_CRYPTO_TKIPMIC (1<<IEEE80211_CIPHER_TKIPMIC)
#define IEEE80211_CRYPTO_CKIP (1<<IEEE80211_CIPHER_CKIP)
#define IEEE80211_CRYPTO_BITS \
"\20\1WEP\2TKIP\3AES\4AES_CCM\5TKIPMIC\6CKIP"
#if defined(__KERNEL__) || defined(_KERNEL)
struct ieee80211com;
struct ieee80211vap;
struct ieee80211_node;
struct mbuf;
MALLOC_DECLARE(M_80211_CRYPTO);
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 cipher, int flags, struct ieee80211_key *);
int ieee80211_crypto_delkey(struct ieee80211vap *,
struct ieee80211_key *);
int ieee80211_crypto_setkey(struct ieee80211vap *, struct ieee80211_key *);
void ieee80211_crypto_delglobalkeys(struct ieee80211vap *);
void ieee80211_crypto_reload_keys(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 ieee80211vap *, struct ieee80211_key *);
void (*ic_detach)(struct ieee80211_key *);
int (*ic_setkey)(struct ieee80211_key *);
void (*ic_setiv)(struct ieee80211_key *, uint8_t *);
int (*ic_encap)(struct ieee80211_key *, struct mbuf *);
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;
#define IEEE80211_KEY_UNDEFINED(k) \
((k)->wk_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);
uint8_t ieee80211_crypto_get_keyid(struct ieee80211vap *vap,
struct ieee80211_key *k);
struct ieee80211_key *ieee80211_crypto_get_txkey(struct ieee80211_node *,
struct mbuf *);
struct ieee80211_key *ieee80211_crypto_encap(struct ieee80211_node *,
struct mbuf *);
struct ieee80211_key *ieee80211_crypto_decap(struct ieee80211_node *,
struct mbuf *, int);
int ieee80211_crypto_demic(struct ieee80211vap *vap, struct ieee80211_key *k,
struct mbuf *, int);
/*
* Add any MIC.
*/
static __inline int
ieee80211_crypto_enmic(struct ieee80211vap *vap,
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 ieee80211vap *vap,
struct ieee80211_key *k, ieee80211_keyix ix)
{
k->wk_cipher = &ieee80211_cipher_none;
k->wk_private = k->wk_cipher->ic_attach(vap, k);
k->wk_keyix = k->wk_rxkeyix = ix;
k->wk_flags = IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV;
}
/*
* Crypt-related notification methods.
*/
void ieee80211_notify_replay_failure(struct ieee80211vap *,
const struct ieee80211_frame *, const struct ieee80211_key *,
uint64_t rsc, int tid);
void ieee80211_notify_michael_failure(struct ieee80211vap *,
const struct ieee80211_frame *, u_int keyix);
#endif /* defined(__KERNEL__) || defined(_KERNEL) */
#endif /* _NET80211_IEEE80211_CRYPTO_H_ */
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