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ieee80211_crypto_none.c revision 1.1 
      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 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_crypto_none.c,v 1.3 2004/12/31 22:42:38 sam Exp $");
     34 
     35 /*
     36  * IEEE 802.11 NULL crypto support.
     37  */
     38 #include <sys/param.h>
     39 #include <sys/systm.h>
     40 #include <sys/mbuf.h>
     41 #include <sys/module.h>
     42 
     43 #include <sys/socket.h>
     44 
     45 #include <net/if.h>
     46 #include <net/if_media.h>
     47 #include <net/ethernet.h>
     48 
     49 #include <net80211/ieee80211_var.h>
     50 
     51 static	void *none_attach(struct ieee80211com *, struct ieee80211_key *);
     52 static	void none_detach(struct ieee80211_key *);
     53 static	int none_setkey(struct ieee80211_key *);
     54 static	int none_encap(struct ieee80211_key *, struct mbuf *, u_int8_t);
     55 static	int none_decap(struct ieee80211_key *, struct mbuf *);
     56 static	int none_enmic(struct ieee80211_key *, struct mbuf *);
     57 static	int none_demic(struct ieee80211_key *, struct mbuf *);
     58 
     59 const struct ieee80211_cipher ieee80211_cipher_none = {
     60 	.ic_name	= "NONE",
     61 	.ic_cipher	= IEEE80211_CIPHER_NONE,
     62 	.ic_header	= 0,
     63 	.ic_trailer	= 0,
     64 	.ic_miclen	= 0,
     65 	.ic_attach	= none_attach,
     66 	.ic_detach	= none_detach,
     67 	.ic_setkey	= none_setkey,
     68 	.ic_encap	= none_encap,
     69 	.ic_decap	= none_decap,
     70 	.ic_enmic	= none_enmic,
     71 	.ic_demic	= none_demic,
     72 };
     73 
     74 static void *
     75 none_attach(struct ieee80211com *ic, struct ieee80211_key *k)
     76 {
     77 	return ic;		/* for diagnostics+stats */
     78 }
     79 
     80 static void
     81 none_detach(struct ieee80211_key *k)
     82 {
     83 	(void) k;
     84 }
     85 
     86 static int
     87 none_setkey(struct ieee80211_key *k)
     88 {
     89 	(void) k;
     90 	return 1;
     91 }
     92 
     93 static int
     94 none_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid)
     95 {
     96 	struct ieee80211com *ic = k->wk_private;
     97 #ifdef IEEE80211_DEBUG
     98 	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
     99 #endif
    100 
    101 	/*
    102 	 * The specified key is not setup; this can
    103 	 * happen, at least, when changing keys.
    104 	 */
    105 	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
    106 		"[%s] key id %u is not set (encap)\n",
    107 		ether_sprintf(wh->i_addr1), keyid>>6);
    108 	ic->ic_stats.is_tx_badcipher++;
    109 	return 0;
    110 }
    111 
    112 static int
    113 none_decap(struct ieee80211_key *k, struct mbuf *m)
    114 {
    115 	struct ieee80211com *ic = k->wk_private;
    116 #ifdef IEEE80211_DEBUG
    117 	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
    118 	const u_int8_t *ivp = (const u_int8_t *)&wh[1];
    119 #endif
    120 
    121 	/*
    122 	 * The specified key is not setup; this can
    123 	 * happen, at least, when changing keys.
    124 	 */
    125 	/* XXX useful to know dst too */
    126 	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
    127 		"[%s] key id %u is not set (decap)\n",
    128 		ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6);
    129 	ic->ic_stats.is_rx_badkeyid++;
    130 	return 0;
    131 }
    132 
    133 static int
    134 none_enmic(struct ieee80211_key *k, struct mbuf *m)
    135 {
    136 	struct ieee80211com *ic = k->wk_private;
    137 
    138 	ic->ic_stats.is_tx_badcipher++;
    139 	return 0;
    140 }
    141 
    142 static int
    143 none_demic(struct ieee80211_key *k, struct mbuf *m)
    144 {
    145 	struct ieee80211com *ic = k->wk_private;
    146 
    147 	ic->ic_stats.is_rx_badkeyid++;
    148 	return 0;
    149 }
    150