Home | History | Annotate | Line # | Download | only in net80211
ieee80211_crypto_none.c revision 1.7.46.1 
      1 /*-
      2  * Copyright (c) 2002-2007 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  *
     14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include <sys/cdefs.h>
     27 #ifdef __FreeBSD__
     28 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_crypto_none.c,v 1.7 2007/06/11 03:36:54 sam Exp $");
     29 #endif
     30 #ifdef __NetBSD__
     31 __KERNEL_RCSID(0, "$NetBSD: ieee80211_crypto_none.c,v 1.7.46.1 2008/02/22 16:50:25 skrll Exp $");
     32 #endif
     33 
     34 /*
     35  * IEEE 802.11 NULL crypto support.
     36  */
     37 #include <sys/param.h>
     38 #include <sys/systm.h>
     39 #include <sys/mbuf.h>
     40 
     41 #include <sys/socket.h>
     42 
     43 #include <net/if.h>
     44 #include <net/if_ether.h>
     45 #include <net/if_media.h>
     46 
     47 #include <net80211/ieee80211_var.h>
     48 
     49 static	void *none_attach(struct ieee80211com *, struct ieee80211_key *);
     50 static	void none_detach(struct ieee80211_key *);
     51 static	int none_setkey(struct ieee80211_key *);
     52 static	int none_encap(struct ieee80211_key *, struct mbuf *, uint8_t);
     53 static	int none_decap(struct ieee80211_key *, struct mbuf *, int);
     54 static	int none_enmic(struct ieee80211_key *, struct mbuf *, int);
     55 static	int none_demic(struct ieee80211_key *, struct mbuf *, int);
     56 
     57 const struct ieee80211_cipher ieee80211_cipher_none = {
     58 	.ic_name	= "NONE",
     59 	.ic_cipher	= IEEE80211_CIPHER_NONE,
     60 	.ic_header	= 0,
     61 	.ic_trailer	= 0,
     62 	.ic_miclen	= 0,
     63 	.ic_attach	= none_attach,
     64 	.ic_detach	= none_detach,
     65 	.ic_setkey	= none_setkey,
     66 	.ic_encap	= none_encap,
     67 	.ic_decap	= none_decap,
     68 	.ic_enmic	= none_enmic,
     69 	.ic_demic	= none_demic,
     70 };
     71 
     72 static void *
     73 none_attach(struct ieee80211com *ic, struct ieee80211_key *k)
     74 {
     75 	return ic;		/* for diagnostics+stats */
     76 }
     77 
     78 static void
     79 none_detach(struct ieee80211_key *k)
     80 {
     81 	(void) k;
     82 }
     83 
     84 static int
     85 none_setkey(struct ieee80211_key *k)
     86 {
     87 	(void) k;
     88 	return 1;
     89 }
     90 
     91 static int
     92 none_encap(struct ieee80211_key *k, struct mbuf *m, uint8_t keyid)
     93 {
     94 	struct ieee80211com *ic = k->wk_private;
     95 #ifdef IEEE80211_DEBUG
     96 	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
     97 #endif
     98 
     99 	/*
    100 	 * The specified key is not setup; this can
    101 	 * happen, at least, when changing keys.
    102 	 */
    103 	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
    104 		"[%s] key id %u is not set (encap)\n",
    105 		ether_sprintf(wh->i_addr1), keyid>>6);
    106 	ic->ic_stats.is_tx_badcipher++;
    107 	return 0;
    108 }
    109 
    110 static int
    111 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
    112 {
    113 	struct ieee80211com *ic = k->wk_private;
    114 #ifdef IEEE80211_DEBUG
    115 	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
    116 	const uint8_t *ivp = (const uint8_t *)&wh[1];
    117 #endif
    118 
    119 	/*
    120 	 * The specified key is not setup; this can
    121 	 * happen, at least, when changing keys.
    122 	 */
    123 	/* XXX useful to know dst too */
    124 	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
    125 		"[%s] key id %u is not set (decap)\n",
    126 		ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6);
    127 	ic->ic_stats.is_rx_badkeyid++;
    128 	return 0;
    129 }
    130 
    131 static int
    132 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
    133 {
    134 	struct ieee80211com *ic = k->wk_private;
    135 
    136 	ic->ic_stats.is_tx_badcipher++;
    137 	return 0;
    138 }
    139 
    140 static int
    141 none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
    142 {
    143 	struct ieee80211com *ic = k->wk_private;
    144 
    145 	ic->ic_stats.is_rx_badkeyid++;
    146 	return 0;
    147 }
    148