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
  26 #include <sys/cdefs.h>
  27 __FBSDID("$FreeBSD$");
  28
  29 /*
  30  * IEEE 802.11 NULL crypto support.
  31  */
  32 #include "opt_wlan.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/kernel.h>
  36 #include <sys/malloc.h>
  37 #include <sys/systm.h>
  38 #include <sys/mbuf.h>
  39 #include <sys/module.h>
  40
  41 #include <sys/socket.h>
  42
  43 #include <net/if.h>
  44 #include <net/if_var.h>
  45 #include <net/if_media.h>
  46 #include <net/ethernet.h>
  47
  48 #include <netproto/802_11/ieee80211_var.h>
  49
  50 static  void *none_attach(struct ieee80211vap *, struct ieee80211_key *);
  51 static  void none_detach(struct ieee80211_key *);
  52 static  int none_setkey(struct ieee80211_key *);
  53 static  void none_setiv(struct ieee80211_key *, uint8_t *);
  54 static  int none_encap(struct ieee80211_key *, struct mbuf *);
  55 static  int none_decap(struct ieee80211_key *, struct mbuf *, int);
  56 static  int none_enmic(struct ieee80211_key *, struct mbuf *, int);
  57 static  int none_demic(struct ieee80211_key *, struct mbuf *, int);
  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_setiv       = none_setiv,
  69         .ic_encap       = none_encap,
  70         .ic_decap       = none_decap,
  71         .ic_enmic       = none_enmic,
  72         .ic_demic       = none_demic,
  73 };
  74
  75 static void *
  76 none_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
  77 {
  78         return vap;             /* for diagnostics+stats */
  79 }
  80
  81 static void
  82 none_detach(struct ieee80211_key *k)
  83 {
  84         (void) k;
  85 }
  86
  87 static int
  88 none_setkey(struct ieee80211_key *k)
  89 {
  90         (void) k;
  91         return 1;
  92 }
  93
  94 static void
  95 none_setiv(struct ieee80211_key *k, uint8_t *ivp)
  96 {
  97 }
  98
  99 static int
 100 none_encap(struct ieee80211_key *k, struct mbuf *m)
 101 {
 102         struct ieee80211vap *vap = k->wk_private;
 103 #ifdef IEEE80211_DEBUG
 104         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
 105 #endif
 106         uint8_t keyid;
 107
 108         keyid = ieee80211_crypto_get_keyid(vap, k);
 109
 110         /*
 111          * The specified key is not setup; this can
 112          * happen, at least, when changing keys.
 113          */
 114         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr1,
 115             "key id %u is not set (encap)", keyid);
 116         vap->iv_stats.is_tx_badcipher++;
 117         return 0;
 118 }
 119
 120 static int
 121 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
 122 {
 123         struct ieee80211vap *vap = k->wk_private;
 124 #ifdef IEEE80211_DEBUG
 125         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
 126         const uint8_t *ivp = (const uint8_t *)&wh[1];
 127 #endif
 128
 129         /*
 130          * The specified key is not setup; this can
 131          * happen, at least, when changing keys.
 132          */
 133         /* XXX useful to know dst too */
 134         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
 135             "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6);
 136         vap->iv_stats.is_rx_badkeyid++;
 137         return 0;
 138 }
 139
 140 static int
 141 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
 142 {
 143         struct ieee80211vap *vap = k->wk_private;
 144
 145         vap->iv_stats.is_tx_badcipher++;
 146         return 0;
 147 }
 148
 149 static int
 150 none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
 151 {
 152         struct ieee80211vap *vap = k->wk_private;
 153
 154         vap->iv_stats.is_rx_badkeyid++;
 155         return 0;
 156 }