/*      $NetBSD: ieee80211_crypto_none.c,v 1.8 2018/01/19 07:53:46 maxv Exp $   */

/*
 * 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.
 */

#include <sys/cdefs.h>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD: src/sys/net80211/ieee80211_crypto_none.c,v 1.5 2005/06/10 16:11:24 sam Exp $");
#endif
#ifdef __NetBSD__
__KERNEL_RCSID(0, "$NetBSD: ieee80211_crypto_none.c,v 1.8 2018/01/19 07:53:46 maxv Exp $");
#endif

/*
 * IEEE 802.11 NULL crypto support.
 */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>

#include <sys/socket.h>

#include <net/if.h>
#include <net/if_ether.h>
#include <net/if_media.h>

#include <net80211/ieee80211_var.h>

static  void *none_attach(struct ieee80211com *, struct ieee80211_key *);
static  void none_detach(struct ieee80211_key *);
static  int none_setkey(struct ieee80211_key *);
static  int none_encap(struct ieee80211_key *, struct mbuf *, u_int8_t);
static  int none_decap(struct ieee80211_key *, struct mbuf *, int);
static  int none_enmic(struct ieee80211_key *, struct mbuf *, int);
static  int none_demic(struct ieee80211_key *, struct mbuf *, int);

const struct ieee80211_cipher ieee80211_cipher_none = {
        .ic_name        = "NONE",
        .ic_cipher      = IEEE80211_CIPHER_NONE,
        .ic_header      = 0,
        .ic_trailer     = 0,
        .ic_miclen      = 0,
        .ic_attach      = none_attach,
        .ic_detach      = none_detach,
        .ic_setkey      = none_setkey,
        .ic_encap       = none_encap,
        .ic_decap       = none_decap,
        .ic_enmic       = none_enmic,
        .ic_demic       = none_demic,
};

static void *
none_attach(struct ieee80211com *ic, struct ieee80211_key *k)
{
        return ic;              /* for diagnostics+stats */
}

static void
none_detach(struct ieee80211_key *k)
{
        (void) k;
}

static int
none_setkey(struct ieee80211_key *k)
{
        (void) k;
        return 1;
}

static int
none_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid)
{
        struct ieee80211com *ic = k->wk_private;
#ifdef IEEE80211_DEBUG
        struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
#endif

        /*
         * The specified key is not setup; this can
         * happen, at least, when changing keys.
         */
        IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
                "[%s] key id %u is not set (encap)\n",
                ether_sprintf(wh->i_addr1), keyid>>6);
        ic->ic_stats.is_tx_badcipher++;
        return 0;
}

static int
none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
{
        struct ieee80211com *ic = k->wk_private;
#ifdef IEEE80211_DEBUG
        struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
        const u_int8_t *ivp = (const u_int8_t *)&wh[1];
#endif

        /*
         * The specified key is not setup; this can
         * happen, at least, when changing keys.
         */
        /* XXX useful to know dst too */
        IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
                "[%s] key id %u is not set (decap)\n",
                ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6);
        ic->ic_stats.is_rx_badkeyid++;
        return 0;
}

static int
none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
{
        struct ieee80211com *ic = k->wk_private;

        ic->ic_stats.is_tx_badcipher++;
        return 0;
}

static int
none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
{
        struct ieee80211com *ic = k->wk_private;

        ic->ic_stats.is_rx_badkeyid++;
        return 0;
}