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      1 /*	$NetBSD: ieee80211_crypto_none.c,v 1.8 2018/01/19 07:53:46 maxv Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * Alternatively, this software may be distributed under the terms of the
     19  * GNU General Public License ("GPL") version 2 as published by the Free
     20  * Software Foundation.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 #ifdef __FreeBSD__
     36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_crypto_none.c,v 1.5 2005/06/10 16:11:24 sam Exp $");
     37 #endif
     38 #ifdef __NetBSD__
     39 __KERNEL_RCSID(0, "$NetBSD: ieee80211_crypto_none.c,v 1.8 2018/01/19 07:53:46 maxv Exp $");
     40 #endif
     41 
     42 /*
     43  * IEEE 802.11 NULL crypto support.
     44  */
     45 #include <sys/param.h>
     46 #include <sys/systm.h>
     47 #include <sys/mbuf.h>
     48 
     49 #include <sys/socket.h>
     50 
     51 #include <net/if.h>
     52 #include <net/if_ether.h>
     53 #include <net/if_media.h>
     54 
     55 #include <net80211/ieee80211_var.h>
     56 
     57 static	void *none_attach(struct ieee80211com *, struct ieee80211_key *);
     58 static	void none_detach(struct ieee80211_key *);
     59 static	int none_setkey(struct ieee80211_key *);
     60 static	int none_encap(struct ieee80211_key *, struct mbuf *, u_int8_t);
     61 static	int none_decap(struct ieee80211_key *, struct mbuf *, int);
     62 static	int none_enmic(struct ieee80211_key *, struct mbuf *, int);
     63 static	int none_demic(struct ieee80211_key *, struct mbuf *, int);
     64 
     65 const struct ieee80211_cipher ieee80211_cipher_none = {
     66 	.ic_name	= "NONE",
     67 	.ic_cipher	= IEEE80211_CIPHER_NONE,
     68 	.ic_header	= 0,
     69 	.ic_trailer	= 0,
     70 	.ic_miclen	= 0,
     71 	.ic_attach	= none_attach,
     72 	.ic_detach	= none_detach,
     73 	.ic_setkey	= none_setkey,
     74 	.ic_encap	= none_encap,
     75 	.ic_decap	= none_decap,
     76 	.ic_enmic	= none_enmic,
     77 	.ic_demic	= none_demic,
     78 };
     79 
     80 static void *
     81 none_attach(struct ieee80211com *ic, struct ieee80211_key *k)
     82 {
     83 	return ic;		/* for diagnostics+stats */
     84 }
     85 
     86 static void
     87 none_detach(struct ieee80211_key *k)
     88 {
     89 	(void) k;
     90 }
     91 
     92 static int
     93 none_setkey(struct ieee80211_key *k)
     94 {
     95 	(void) k;
     96 	return 1;
     97 }
     98 
     99 static int
    100 none_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid)
    101 {
    102 	struct ieee80211com *ic = k->wk_private;
    103 #ifdef IEEE80211_DEBUG
    104 	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
    105 #endif
    106 
    107 	/*
    108 	 * The specified key is not setup; this can
    109 	 * happen, at least, when changing keys.
    110 	 */
    111 	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
    112 		"[%s] key id %u is not set (encap)\n",
    113 		ether_sprintf(wh->i_addr1), keyid>>6);
    114 	ic->ic_stats.is_tx_badcipher++;
    115 	return 0;
    116 }
    117 
    118 static int
    119 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
    120 {
    121 	struct ieee80211com *ic = k->wk_private;
    122 #ifdef IEEE80211_DEBUG
    123 	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
    124 	const u_int8_t *ivp = (const u_int8_t *)&wh[1];
    125 #endif
    126 
    127 	/*
    128 	 * The specified key is not setup; this can
    129 	 * happen, at least, when changing keys.
    130 	 */
    131 	/* XXX useful to know dst too */
    132 	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
    133 		"[%s] key id %u is not set (decap)\n",
    134 		ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6);
    135 	ic->ic_stats.is_rx_badkeyid++;
    136 	return 0;
    137 }
    138 
    139 static int
    140 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
    141 {
    142 	struct ieee80211com *ic = k->wk_private;
    143 
    144 	ic->ic_stats.is_tx_badcipher++;
    145 	return 0;
    146 }
    147 
    148 static int
    149 none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
    150 {
    151 	struct ieee80211com *ic = k->wk_private;
    152 
    153 	ic->ic_stats.is_rx_badkeyid++;
    154 	return 0;
    155 }
    156