sys/net80211/ieee80211_crypto_none.c

   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 1.5 2005/06/10 16:11:24 sam Exp $");
  35 #endif
  36 #ifdef __NetBSD__
  37 __KERNEL_RCSID(0, "$NetBSD: ieee80211_crypto_none.c,v 1.6 2006/10/12 01:32:30 christos 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_ether.h>
  51 #include <net/if_media.h>
  52
  53 #include <net80211/ieee80211_var.h>
  54
  55 static  void *none_attach(struct ieee80211com *, struct ieee80211_key *);
  56 static  void none_detach(struct ieee80211_key *);
  57 static  int none_setkey(struct ieee80211_key *);
  58 static  int none_encap(struct ieee80211_key *, struct mbuf *, u_int8_t);
  59 static  int none_decap(struct ieee80211_key *, struct mbuf *, int);
  60 static  int none_enmic(struct ieee80211_key *, struct mbuf *, int);
  61 static  int none_demic(struct ieee80211_key *, struct mbuf *, int);
  62
  63 const struct ieee80211_cipher ieee80211_cipher_none = {
  64         .ic_name        = "NONE",
  65         .ic_cipher      = IEEE80211_CIPHER_NONE,
  66         .ic_header      = 0,
  67         .ic_trailer     = 0,
  68         .ic_miclen      = 0,
  69         .ic_attach      = none_attach,
  70         .ic_detach      = none_detach,
  71         .ic_setkey      = none_setkey,
  72         .ic_encap       = none_encap,
  73         .ic_decap       = none_decap,
  74         .ic_enmic       = none_enmic,
  75         .ic_demic       = none_demic,
  76 };
  77
  78 static void *
  79 none_attach(struct ieee80211com *ic, struct ieee80211_key *k)
  80 {
  81         return ic;              /* for diagnostics+stats */
  82 }
  83
  84 static void
  85 none_detach(struct ieee80211_key *k)
  86 {
  87         (void) k;
  88 }
  89
  90 static int
  91 none_setkey(struct ieee80211_key *k)
  92 {
  93         (void) k;
  94         return 1;
  95 }
  96
  97 static int
  98 none_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid)
  99 {
 100         struct ieee80211com *ic = k->wk_private;
 101 #ifdef IEEE80211_DEBUG
 102         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
 103 #endif
 104
 105         /*
 106          * The specified key is not setup; this can
 107          * happen, at least, when changing keys.
 108          */
 109         IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
 110                 "[%s] key id %u is not set (encap)\n",
 111                 ether_sprintf(wh->i_addr1), keyid>>6);
 112         ic->ic_stats.is_tx_badcipher++;
 113         return 0;
 114 }
 115
 116 static int
 117 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
 118 {
 119         struct ieee80211com *ic = k->wk_private;
 120 #ifdef IEEE80211_DEBUG
 121         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
 122         const u_int8_t *ivp = (const u_int8_t *)&wh[1];
 123 #endif
 124
 125         /*
 126          * The specified key is not setup; this can
 127          * happen, at least, when changing keys.
 128          */
 129         /* XXX useful to know dst too */
 130         IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
 131                 "[%s] key id %u is not set (decap)\n",
 132                 ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6);
 133         ic->ic_stats.is_rx_badkeyid++;
 134         return 0;
 135 }
 136
 137 static int
 138 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
 139 {
 140         struct ieee80211com *ic = k->wk_private;
 141
 142         ic->ic_stats.is_tx_badcipher++;
 143         return 0;
 144 }
 145
 146 static int
 147 none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
 148 {
 149         struct ieee80211com *ic = k->wk_private;
 150
 151         ic->ic_stats.is_rx_badkeyid++;
 152         return 0;
 153 }