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  * 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: releng/11.0/sys/net80211/ieee80211_crypto_none.c 300232 2016-05-19 21:08:33Z avos $");
   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_media.h>
   45 #include <net/ethernet.h>
   46 
   47 #include <net80211/ieee80211_var.h>
   48 
   49 static  void *none_attach(struct ieee80211vap *, struct ieee80211_key *);
   50 static  void none_detach(struct ieee80211_key *);
   51 static  int none_setkey(struct ieee80211_key *);
   52 static  void none_setiv(struct ieee80211_key *, uint8_t *);
   53 static  int none_encap(struct ieee80211_key *, struct mbuf *);
   54 static  int none_decap(struct ieee80211_key *, struct mbuf *, int);
   55 static  int none_enmic(struct ieee80211_key *, struct mbuf *, int);
   56 static  int none_demic(struct ieee80211_key *, struct mbuf *, int);
   57 
   58 const struct ieee80211_cipher ieee80211_cipher_none = {
   59         .ic_name        = "NONE",
   60         .ic_cipher      = IEEE80211_CIPHER_NONE,
   61         .ic_header      = 0,
   62         .ic_trailer     = 0,
   63         .ic_miclen      = 0,
   64         .ic_attach      = none_attach,
   65         .ic_detach      = none_detach,
   66         .ic_setkey      = none_setkey,
   67         .ic_setiv       = none_setiv,
   68         .ic_encap       = none_encap,
   69         .ic_decap       = none_decap,
   70         .ic_enmic       = none_enmic,
   71         .ic_demic       = none_demic,
   72 };
   73 
   74 static void *
   75 none_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
   76 {
   77         return vap;             /* for diagnostics+stats */
   78 }
   79 
   80 static void
   81 none_detach(struct ieee80211_key *k)
   82 {
   83         (void) k;
   84 }
   85 
   86 static int
   87 none_setkey(struct ieee80211_key *k)
   88 {
   89         (void) k;
   90         return 1;
   91 }
   92 
   93 static void
   94 none_setiv(struct ieee80211_key *k, uint8_t *ivp)
   95 {
   96 }
   97 
   98 static int
   99 none_encap(struct ieee80211_key *k, struct mbuf *m)
  100 {
  101         struct ieee80211vap *vap = k->wk_private;
  102 #ifdef IEEE80211_DEBUG
  103         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  104         uint8_t keyid;
  105 
  106         keyid = ieee80211_crypto_get_keyid(vap, k);
  107 
  108         /*
  109          * The specified key is not setup; this can
  110          * happen, at least, when changing keys.
  111          */
  112         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr1,
  113             "key id %u is not set (encap)", keyid);
  114 #endif
  115         vap->iv_stats.is_tx_badcipher++;
  116         return 0;
  117 }
  118 
  119 static int
  120 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
  121 {
  122         struct ieee80211vap *vap = k->wk_private;
  123 #ifdef IEEE80211_DEBUG
  124         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  125         const uint8_t *ivp = (const uint8_t *)&wh[1];
  126 #endif
  127 
  128         /*
  129          * The specified key is not setup; this can
  130          * happen, at least, when changing keys.
  131          */
  132         /* XXX useful to know dst too */
  133         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
  134             "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6);
  135         vap->iv_stats.is_rx_badkeyid++;
  136         return 0;
  137 }
  138 
  139 static int
  140 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
  141 {
  142         struct ieee80211vap *vap = k->wk_private;
  143 
  144         vap->iv_stats.is_tx_badcipher++;
  145         return 0;
  146 }
  147 
  148 static int
  149 none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
  150 {
  151         struct ieee80211vap *vap = k->wk_private;
  152 
  153         vap->iv_stats.is_rx_badkeyid++;
  154         return 0;
  155 }

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