The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_crypto_none.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 /*
   32  * IEEE 802.11 NULL crypto support.
   33  */
   34 #include "opt_wlan.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/kernel.h> 
   38 #include <sys/malloc.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 ieee80211vap *, struct ieee80211_key *);
   52 static  void none_detach(struct ieee80211_key *);
   53 static  int none_setkey(struct ieee80211_key *);
   54 static  void none_setiv(struct ieee80211_key *, uint8_t *);
   55 static  int none_encap(struct ieee80211_key *, struct mbuf *);
   56 static  int none_decap(struct ieee80211_key *, struct mbuf *, int);
   57 static  int none_enmic(struct ieee80211_key *, struct mbuf *, int);
   58 static  int none_demic(struct ieee80211_key *, struct mbuf *, int);
   59 
   60 const struct ieee80211_cipher ieee80211_cipher_none = {
   61         .ic_name        = "NONE",
   62         .ic_cipher      = IEEE80211_CIPHER_NONE,
   63         .ic_header      = 0,
   64         .ic_trailer     = 0,
   65         .ic_miclen      = 0,
   66         .ic_attach      = none_attach,
   67         .ic_detach      = none_detach,
   68         .ic_setkey      = none_setkey,
   69         .ic_setiv       = none_setiv,
   70         .ic_encap       = none_encap,
   71         .ic_decap       = none_decap,
   72         .ic_enmic       = none_enmic,
   73         .ic_demic       = none_demic,
   74 };
   75 
   76 static void *
   77 none_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
   78 {
   79         return vap;             /* for diagnostics+stats */
   80 }
   81 
   82 static void
   83 none_detach(struct ieee80211_key *k)
   84 {
   85         (void) k;
   86 }
   87 
   88 static int
   89 none_setkey(struct ieee80211_key *k)
   90 {
   91         (void) k;
   92         return 1;
   93 }
   94 
   95 static void
   96 none_setiv(struct ieee80211_key *k, uint8_t *ivp)
   97 {
   98 }
   99 
  100 static int
  101 none_encap(struct ieee80211_key *k, struct mbuf *m)
  102 {
  103         struct ieee80211vap *vap = k->wk_private;
  104 #ifdef IEEE80211_DEBUG
  105         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  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 #endif
  117         vap->iv_stats.is_tx_badcipher++;
  118         return 0;
  119 }
  120 
  121 static int
  122 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
  123 {
  124         struct ieee80211vap *vap = k->wk_private;
  125 #ifdef IEEE80211_DEBUG
  126         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  127         const uint8_t *ivp = (const uint8_t *)&wh[1];
  128 #endif
  129 
  130         /*
  131          * The specified key is not setup; this can
  132          * happen, at least, when changing keys.
  133          */
  134         /* XXX useful to know dst too */
  135         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
  136             "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6);
  137         vap->iv_stats.is_rx_badkeyid++;
  138         return 0;
  139 }
  140 
  141 static int
  142 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
  143 {
  144         struct ieee80211vap *vap = k->wk_private;
  145 
  146         vap->iv_stats.is_tx_badcipher++;
  147         return 0;
  148 }
  149 
  150 static int
  151 none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
  152 {
  153         struct ieee80211vap *vap = k->wk_private;
  154 
  155         vap->iv_stats.is_rx_badkeyid++;
  156         return 0;
  157 }

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