sys/netproto/802_11/wlan/ieee80211_crypto_none.c

   1 /*-
   2  * Copyright (c) 2002-2008 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  * $FreeBSD: head/sys/net80211/ieee80211_crypto_none.c 178354 2008-04-20 20:35:46Z sam $
  26  */
  27
  28 /*
  29  * IEEE 802.11 NULL crypto support.
  30  */
  31 #include "opt_wlan.h"
  32
  33 #include <sys/param.h>
  34 #include <sys/kernel.h>
  35 #include <sys/systm.h>
  36 #include <sys/mbuf.h>
  37 #include <sys/module.h>
  38
  39 #include <sys/socket.h>
  40
  41 #include <net/if.h>
  42 #include <net/if_media.h>
  43 #include <net/ethernet.h>
  44 #include <net/route.h>
  45
  46 #include <netproto/802_11/ieee80211_var.h>
  47
  48 static  void *none_attach(struct ieee80211vap *, struct ieee80211_key *);
  49 static  void none_detach(struct ieee80211_key *);
  50 static  int none_setkey(struct ieee80211_key *);
  51 static  int none_encap(struct ieee80211_key *, struct mbuf *, uint8_t);
  52 static  int none_decap(struct ieee80211_key *, struct mbuf *, int);
  53 static  int none_enmic(struct ieee80211_key *, struct mbuf *, int);
  54 static  int none_demic(struct ieee80211_key *, struct mbuf *, int);
  55
  56 const struct ieee80211_cipher ieee80211_cipher_none = {
  57         .ic_name        = "NONE",
  58         .ic_cipher      = IEEE80211_CIPHER_NONE,
  59         .ic_header      = 0,
  60         .ic_trailer     = 0,
  61         .ic_miclen      = 0,
  62         .ic_attach      = none_attach,
  63         .ic_detach      = none_detach,
  64         .ic_setkey      = none_setkey,
  65         .ic_encap       = none_encap,
  66         .ic_decap       = none_decap,
  67         .ic_enmic       = none_enmic,
  68         .ic_demic       = none_demic,
  69 };
  70
  71 static void *
  72 none_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
  73 {
  74         return vap;             /* for diagnostics+stats */
  75 }
  76
  77 static void
  78 none_detach(struct ieee80211_key *k)
  79 {
  80         (void) k;
  81 }
  82
  83 static int
  84 none_setkey(struct ieee80211_key *k)
  85 {
  86         (void) k;
  87         return 1;
  88 }
  89
  90 static int
  91 none_encap(struct ieee80211_key *k, struct mbuf *m, uint8_t keyid)
  92 {
  93         struct ieee80211vap *vap = k->wk_private;
  94 #ifdef IEEE80211_DEBUG
  95         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  96 #endif
  97
  98         /*
  99          * The specified key is not setup; this can
 100          * happen, at least, when changing keys.
 101          */
 102         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr1,
 103             "key id %u is not set (encap)", keyid>>6);
 104         vap->iv_stats.is_tx_badcipher++;
 105         return 0;
 106 }
 107
 108 static int
 109 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
 110 {
 111         struct ieee80211vap *vap = k->wk_private;
 112 #ifdef IEEE80211_DEBUG
 113         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
 114         const uint8_t *ivp = (const uint8_t *)&wh[1];
 115 #endif
 116
 117         /*
 118          * The specified key is not setup; this can
 119          * happen, at least, when changing keys.
 120          */
 121         /* XXX useful to know dst too */
 122         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
 123             "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6);
 124         vap->iv_stats.is_rx_badkeyid++;
 125         return 0;
 126 }
 127
 128 static int
 129 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
 130 {
 131         struct ieee80211vap *vap = k->wk_private;
 132
 133         vap->iv_stats.is_tx_badcipher++;
 134         return 0;
 135 }
 136
 137 static int
 138 none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
 139 {
 140         struct ieee80211vap *vap = k->wk_private;
 141
 142         vap->iv_stats.is_rx_badkeyid++;
 143         return 0;
 144 }