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ieee80211_crypto_none.c revision 1.2 
      1 /*-
      2  * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. The name of the author may not be used to endorse or promote products
     14  *    derived from this software without specific prior written permission.
     15  *
     16  * Alternatively, this software may be distributed under the terms of the
     17  * GNU General Public License ("GPL") version 2 as published by the Free
     18  * Software Foundation.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifdef __FreeBSD__
     34 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_crypto_none.c,v 1.3 2004/12/31 22:42:38 sam Exp $");
     35 #endif
     36 #ifdef __NetBSD__
     37 __KERNEL_RCSID(0, "$NetBSD: ieee80211_crypto_none.c,v 1.2 2005/06/22 06:16:02 dyoung Exp $");
     38 #endif
     39 
     40 /*
     41  * IEEE 802.11 NULL crypto support.
     42  */
     43 #include <sys/param.h>
     44 #include <sys/systm.h>
     45 #include <sys/mbuf.h>
     46 
     47 #include <sys/socket.h>
     48 
     49 #include <net/if.h>
     50 #include <net/if_media.h>
     51 
     52 #include <net80211/ieee80211_var.h>
     53 
     54 static	void *none_attach(struct ieee80211com *, struct ieee80211_key *);
     55 static	void none_detach(struct ieee80211_key *);
     56 static	int none_setkey(struct ieee80211_key *);
     57 static	int none_encap(struct ieee80211_key *, struct mbuf *, u_int8_t);
     58 static	int none_decap(struct ieee80211_key *, struct mbuf *);
     59 static	int none_enmic(struct ieee80211_key *, struct mbuf *);
     60 static	int none_demic(struct ieee80211_key *, struct mbuf *);
     61 
     62 const struct ieee80211_cipher ieee80211_cipher_none = {
     63 	.ic_name	= "NONE",
     64 	.ic_cipher	= IEEE80211_CIPHER_NONE,
     65 	.ic_header	= 0,
     66 	.ic_trailer	= 0,
     67 	.ic_miclen	= 0,
     68 	.ic_attach	= none_attach,
     69 	.ic_detach	= none_detach,
     70 	.ic_setkey	= none_setkey,
     71 	.ic_encap	= none_encap,
     72 	.ic_decap	= none_decap,
     73 	.ic_enmic	= none_enmic,
     74 	.ic_demic	= none_demic,
     75 };
     76 
     77 static void *
     78 none_attach(struct ieee80211com *ic, struct ieee80211_key *k)
     79 {
     80 	return ic;		/* for diagnostics+stats */
     81 }
     82 
     83 static void
     84 none_detach(struct ieee80211_key *k)
     85 {
     86 	(void) k;
     87 }
     88 
     89 static int
     90 none_setkey(struct ieee80211_key *k)
     91 {
     92 	(void) k;
     93 	return 1;
     94 }
     95 
     96 static int
     97 none_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid)
     98 {
     99 	struct ieee80211com *ic = k->wk_private;
    100 #ifdef IEEE80211_DEBUG
    101 	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
    102 #endif
    103 
    104 	/*
    105 	 * The specified key is not setup; this can
    106 	 * happen, at least, when changing keys.
    107 	 */
    108 	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
    109 		"[%s] key id %u is not set (encap)\n",
    110 		ether_sprintf(wh->i_addr1), keyid>>6);
    111 	ic->ic_stats.is_tx_badcipher++;
    112 	return 0;
    113 }
    114 
    115 static int
    116 none_decap(struct ieee80211_key *k, struct mbuf *m)
    117 {
    118 	struct ieee80211com *ic = k->wk_private;
    119 #ifdef IEEE80211_DEBUG
    120 	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
    121 	const u_int8_t *ivp = (const u_int8_t *)&wh[1];
    122 #endif
    123 
    124 	/*
    125 	 * The specified key is not setup; this can
    126 	 * happen, at least, when changing keys.
    127 	 */
    128 	/* XXX useful to know dst too */
    129 	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
    130 		"[%s] key id %u is not set (decap)\n",
    131 		ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6);
    132 	ic->ic_stats.is_rx_badkeyid++;
    133 	return 0;
    134 }
    135 
    136 static int
    137 none_enmic(struct ieee80211_key *k, struct mbuf *m)
    138 {
    139 	struct ieee80211com *ic = k->wk_private;
    140 
    141 	ic->ic_stats.is_tx_badcipher++;
    142 	return 0;
    143 }
    144 
    145 static int
    146 none_demic(struct ieee80211_key *k, struct mbuf *m)
    147 {
    148 	struct ieee80211com *ic = k->wk_private;
    149 
    150 	ic->ic_stats.is_rx_badkeyid++;
    151 	return 0;
    152 }
    153