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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_crypto_tkip.c

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    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 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_crypto_tkip.c,v 1.9.2.2.8.1 2008/10/02 02:57:24 kensmith Exp $");
   34 
   35 /*
   36  * IEEE 802.11i TKIP crypto support.
   37  *
   38  * Part of this module is derived from similar code in the Host
   39  * AP driver. The code is used with the consent of the author and
   40  * it's license is included below.
   41  */
   42 #include <sys/param.h>
   43 #include <sys/systm.h> 
   44 #include <sys/mbuf.h>   
   45 #include <sys/malloc.h>
   46 #include <sys/kernel.h>
   47 #include <sys/module.h>
   48 #include <sys/endian.h>
   49 
   50 #include <sys/socket.h>
   51 
   52 #include <net/if.h>
   53 #include <net/if_media.h>
   54 #include <net/ethernet.h>
   55 
   56 #include <net80211/ieee80211_var.h>
   57 
   58 static  void *tkip_attach(struct ieee80211com *, struct ieee80211_key *);
   59 static  void tkip_detach(struct ieee80211_key *);
   60 static  int tkip_setkey(struct ieee80211_key *);
   61 static  int tkip_encap(struct ieee80211_key *, struct mbuf *m, u_int8_t keyid);
   62 static  int tkip_enmic(struct ieee80211_key *, struct mbuf *, int);
   63 static  int tkip_decap(struct ieee80211_key *, struct mbuf *, int);
   64 static  int tkip_demic(struct ieee80211_key *, struct mbuf *, int);
   65 
   66 static const struct ieee80211_cipher tkip  = {
   67         .ic_name        = "TKIP",
   68         .ic_cipher      = IEEE80211_CIPHER_TKIP,
   69         .ic_header      = IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN +
   70                           IEEE80211_WEP_EXTIVLEN,
   71         .ic_trailer     = IEEE80211_WEP_CRCLEN,
   72         .ic_miclen      = IEEE80211_WEP_MICLEN,
   73         .ic_attach      = tkip_attach,
   74         .ic_detach      = tkip_detach,
   75         .ic_setkey      = tkip_setkey,
   76         .ic_encap       = tkip_encap,
   77         .ic_decap       = tkip_decap,
   78         .ic_enmic       = tkip_enmic,
   79         .ic_demic       = tkip_demic,
   80 };
   81 
   82 typedef uint8_t u8;
   83 typedef uint16_t u16;
   84 typedef uint32_t __u32;
   85 typedef uint32_t u32;
   86 #define memmove(dst, src, n)    ovbcopy(src, dst, n)
   87 
   88 struct tkip_ctx {
   89         struct ieee80211com *tc_ic;     /* for diagnostics */
   90 
   91         u16     tx_ttak[5];
   92         int     tx_phase1_done;
   93         u8      tx_rc4key[16];          /* XXX for test module; make locals? */
   94 
   95         u16     rx_ttak[5];
   96         int     rx_phase1_done;
   97         u8      rx_rc4key[16];          /* XXX for test module; make locals? */
   98         uint64_t rx_rsc;                /* held until MIC verified */
   99 };
  100 
  101 static  void michael_mic(struct tkip_ctx *, const u8 *key,
  102                 struct mbuf *m, u_int off, size_t data_len,
  103                 u8 mic[IEEE80211_WEP_MICLEN]);
  104 static  int tkip_encrypt(struct tkip_ctx *, struct ieee80211_key *,
  105                 struct mbuf *, int hdr_len);
  106 static  int tkip_decrypt(struct tkip_ctx *, struct ieee80211_key *,
  107                 struct mbuf *, int hdr_len);
  108 
  109 /* number of references from net80211 layer */
  110 static  int nrefs = 0;
  111 
  112 static void *
  113 tkip_attach(struct ieee80211com *ic, struct ieee80211_key *k)
  114 {
  115         struct tkip_ctx *ctx;
  116 
  117         MALLOC(ctx, struct tkip_ctx *, sizeof(struct tkip_ctx),
  118                 M_DEVBUF, M_NOWAIT | M_ZERO);
  119         if (ctx == NULL) {
  120                 ic->ic_stats.is_crypto_nomem++;
  121                 return NULL;
  122         }
  123 
  124         ctx->tc_ic = ic;
  125         nrefs++;                        /* NB: we assume caller locking */
  126         return ctx;
  127 }
  128 
  129 static void
  130 tkip_detach(struct ieee80211_key *k)
  131 {
  132         struct tkip_ctx *ctx = k->wk_private;
  133 
  134         FREE(ctx, M_DEVBUF);
  135         KASSERT(nrefs > 0, ("imbalanced attach/detach"));
  136         nrefs--;                        /* NB: we assume caller locking */
  137 }
  138 
  139 static int
  140 tkip_setkey(struct ieee80211_key *k)
  141 {
  142         struct tkip_ctx *ctx = k->wk_private;
  143 
  144         if (k->wk_keylen != (128/NBBY)) {
  145                 (void) ctx;             /* XXX */
  146                 IEEE80211_DPRINTF(ctx->tc_ic, IEEE80211_MSG_CRYPTO,
  147                         "%s: Invalid key length %u, expecting %u\n",
  148                         __func__, k->wk_keylen, 128/NBBY);
  149                 return 0;
  150         }
  151         k->wk_keytsc = 1;               /* TSC starts at 1 */
  152         return 1;
  153 }
  154 
  155 /*
  156  * Add privacy headers and do any s/w encryption required.
  157  */
  158 static int
  159 tkip_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid)
  160 {
  161         struct tkip_ctx *ctx = k->wk_private;
  162         struct ieee80211com *ic = ctx->tc_ic;
  163         u_int8_t *ivp;
  164         int hdrlen;
  165 
  166         /*
  167          * Handle TKIP counter measures requirement.
  168          */
  169         if (ic->ic_flags & IEEE80211_F_COUNTERM) {
  170 #ifdef IEEE80211_DEBUG
  171                 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  172 #endif
  173 
  174                 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
  175                         "[%s] Discard frame due to countermeasures (%s)\n",
  176                         ether_sprintf(wh->i_addr2), __func__);
  177                 ic->ic_stats.is_crypto_tkipcm++;
  178                 return 0;
  179         }
  180         hdrlen = ieee80211_hdrspace(ic, mtod(m, void *));
  181 
  182         /*
  183          * Copy down 802.11 header and add the IV, KeyID, and ExtIV.
  184          */
  185         M_PREPEND(m, tkip.ic_header, M_NOWAIT);
  186         if (m == NULL)
  187                 return 0;
  188         ivp = mtod(m, u_int8_t *);
  189         memmove(ivp, ivp + tkip.ic_header, hdrlen);
  190         ivp += hdrlen;
  191 
  192         ivp[0] = k->wk_keytsc >> 8;             /* TSC1 */
  193         ivp[1] = (ivp[0] | 0x20) & 0x7f;        /* WEP seed */
  194         ivp[2] = k->wk_keytsc >> 0;             /* TSC0 */
  195         ivp[3] = keyid | IEEE80211_WEP_EXTIV;   /* KeyID | ExtID */
  196         ivp[4] = k->wk_keytsc >> 16;            /* TSC2 */
  197         ivp[5] = k->wk_keytsc >> 24;            /* TSC3 */
  198         ivp[6] = k->wk_keytsc >> 32;            /* TSC4 */
  199         ivp[7] = k->wk_keytsc >> 40;            /* TSC5 */
  200 
  201         /*
  202          * Finally, do software encrypt if neeed.
  203          */
  204         if (k->wk_flags & IEEE80211_KEY_SWCRYPT) {
  205                 if (!tkip_encrypt(ctx, k, m, hdrlen))
  206                         return 0;
  207                 /* NB: tkip_encrypt handles wk_keytsc */
  208         } else
  209                 k->wk_keytsc++;
  210 
  211         return 1;
  212 }
  213 
  214 /*
  215  * Add MIC to the frame as needed.
  216  */
  217 static int
  218 tkip_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
  219 {
  220         struct tkip_ctx *ctx = k->wk_private;
  221 
  222         if (force || (k->wk_flags & IEEE80211_KEY_SWMIC)) {
  223                 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  224                 struct ieee80211com *ic = ctx->tc_ic;
  225                 int hdrlen;
  226                 uint8_t mic[IEEE80211_WEP_MICLEN];
  227 
  228                 ic->ic_stats.is_crypto_tkipenmic++;
  229 
  230                 hdrlen = ieee80211_hdrspace(ic, wh);
  231 
  232                 michael_mic(ctx, k->wk_txmic,
  233                         m, hdrlen, m->m_pkthdr.len - hdrlen, mic);
  234                 return m_append(m, tkip.ic_miclen, mic);
  235         }
  236         return 1;
  237 }
  238 
  239 static __inline uint64_t
  240 READ_6(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5)
  241 {
  242         uint32_t iv32 = (b0 << 0) | (b1 << 8) | (b2 << 16) | (b3 << 24);
  243         uint16_t iv16 = (b4 << 0) | (b5 << 8);
  244         return (((uint64_t)iv16) << 32) | iv32;
  245 }
  246 
  247 /*
  248  * Validate and strip privacy headers (and trailer) for a
  249  * received frame.  If necessary, decrypt the frame using
  250  * the specified key.
  251  */
  252 static int
  253 tkip_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
  254 {
  255         struct tkip_ctx *ctx = k->wk_private;
  256         struct ieee80211com *ic = ctx->tc_ic;
  257         struct ieee80211_frame *wh;
  258         uint8_t *ivp;
  259 
  260         /*
  261          * Header should have extended IV and sequence number;
  262          * verify the former and validate the latter.
  263          */
  264         wh = mtod(m, struct ieee80211_frame *);
  265         ivp = mtod(m, uint8_t *) + hdrlen;
  266         if ((ivp[IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV) == 0) {
  267                 /*
  268                  * No extended IV; discard frame.
  269                  */
  270                 IEEE80211_DPRINTF(ctx->tc_ic, IEEE80211_MSG_CRYPTO,
  271                         "[%s] missing ExtIV for TKIP cipher\n",
  272                         ether_sprintf(wh->i_addr2));
  273                 ctx->tc_ic->ic_stats.is_rx_tkipformat++;
  274                 return 0;
  275         }
  276         /*
  277          * Handle TKIP counter measures requirement.
  278          */
  279         if (ic->ic_flags & IEEE80211_F_COUNTERM) {
  280                 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
  281                         "[%s] discard frame due to countermeasures (%s)\n",
  282                         ether_sprintf(wh->i_addr2), __func__);
  283                 ic->ic_stats.is_crypto_tkipcm++;
  284                 return 0;
  285         }
  286 
  287         ctx->rx_rsc = READ_6(ivp[2], ivp[0], ivp[4], ivp[5], ivp[6], ivp[7]);
  288         if (ctx->rx_rsc <= k->wk_keyrsc) {
  289                 /*
  290                  * Replay violation; notify upper layer.
  291                  */
  292                 ieee80211_notify_replay_failure(ctx->tc_ic, wh, k, ctx->rx_rsc);
  293                 ctx->tc_ic->ic_stats.is_rx_tkipreplay++;
  294                 return 0;
  295         }
  296         /*
  297          * NB: We can't update the rsc in the key until MIC is verified.
  298          *
  299          * We assume we are not preempted between doing the check above
  300          * and updating wk_keyrsc when stripping the MIC in tkip_demic.
  301          * Otherwise we might process another packet and discard it as
  302          * a replay.
  303          */
  304 
  305         /*
  306          * Check if the device handled the decrypt in hardware.
  307          * If so we just strip the header; otherwise we need to
  308          * handle the decrypt in software.
  309          */
  310         if ((k->wk_flags & IEEE80211_KEY_SWCRYPT) &&
  311             !tkip_decrypt(ctx, k, m, hdrlen))
  312                 return 0;
  313 
  314         /*
  315          * Copy up 802.11 header and strip crypto bits.
  316          */
  317         memmove(mtod(m, uint8_t *) + tkip.ic_header, mtod(m, void *), hdrlen);
  318         m_adj(m, tkip.ic_header);
  319         m_adj(m, -tkip.ic_trailer);
  320 
  321         return 1;
  322 }
  323 
  324 /*
  325  * Verify and strip MIC from the frame.
  326  */
  327 static int
  328 tkip_demic(struct ieee80211_key *k, struct mbuf *m, int force)
  329 {
  330         struct tkip_ctx *ctx = k->wk_private;
  331 
  332         if (force || (k->wk_flags & IEEE80211_KEY_SWMIC)) {
  333                 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  334                 struct ieee80211com *ic = ctx->tc_ic;
  335                 int hdrlen = ieee80211_hdrspace(ic, wh);
  336                 u8 mic[IEEE80211_WEP_MICLEN];
  337                 u8 mic0[IEEE80211_WEP_MICLEN];
  338 
  339                 ic->ic_stats.is_crypto_tkipdemic++;
  340 
  341                 michael_mic(ctx, k->wk_rxmic, 
  342                         m, hdrlen, m->m_pkthdr.len - (hdrlen + tkip.ic_miclen),
  343                         mic);
  344                 m_copydata(m, m->m_pkthdr.len - tkip.ic_miclen,
  345                         tkip.ic_miclen, mic0);
  346                 if (memcmp(mic, mic0, tkip.ic_miclen)) {
  347                         /* NB: 802.11 layer handles statistic and debug msg */
  348                         ieee80211_notify_michael_failure(ic, wh,
  349                                 k->wk_rxkeyix != IEEE80211_KEYIX_NONE ?
  350                                         k->wk_rxkeyix : k->wk_keyix);
  351                         return 0;
  352                 }
  353         }
  354         /*
  355          * Strip MIC from the tail.
  356          */
  357         m_adj(m, -tkip.ic_miclen);
  358 
  359         /*
  360          * Ok to update rsc now that MIC has been verified.
  361          */
  362         k->wk_keyrsc = ctx->rx_rsc;
  363 
  364         return 1;
  365 }
  366 
  367 /*
  368  * Host AP crypt: host-based TKIP encryption implementation for Host AP driver
  369  *
  370  * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi>
  371  *
  372  * This program is free software; you can redistribute it and/or modify
  373  * it under the terms of the GNU General Public License version 2 as
  374  * published by the Free Software Foundation. See README and COPYING for
  375  * more details.
  376  *
  377  * Alternatively, this software may be distributed under the terms of BSD
  378  * license.
  379  */
  380 
  381 static const __u32 crc32_table[256] = {
  382         0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
  383         0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
  384         0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
  385         0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
  386         0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
  387         0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
  388         0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
  389         0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
  390         0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
  391         0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
  392         0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
  393         0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
  394         0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
  395         0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
  396         0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
  397         0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
  398         0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
  399         0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
  400         0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
  401         0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
  402         0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
  403         0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
  404         0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
  405         0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
  406         0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
  407         0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
  408         0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
  409         0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
  410         0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
  411         0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
  412         0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
  413         0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
  414         0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
  415         0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
  416         0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
  417         0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
  418         0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
  419         0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
  420         0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
  421         0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
  422         0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
  423         0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
  424         0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
  425         0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
  426         0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
  427         0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
  428         0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
  429         0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
  430         0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
  431         0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
  432         0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
  433         0x2d02ef8dL
  434 };
  435 
  436 static __inline u16 RotR1(u16 val)
  437 {
  438         return (val >> 1) | (val << 15);
  439 }
  440 
  441 static __inline u8 Lo8(u16 val)
  442 {
  443         return val & 0xff;
  444 }
  445 
  446 static __inline u8 Hi8(u16 val)
  447 {
  448         return val >> 8;
  449 }
  450 
  451 static __inline u16 Lo16(u32 val)
  452 {
  453         return val & 0xffff;
  454 }
  455 
  456 static __inline u16 Hi16(u32 val)
  457 {
  458         return val >> 16;
  459 }
  460 
  461 static __inline u16 Mk16(u8 hi, u8 lo)
  462 {
  463         return lo | (((u16) hi) << 8);
  464 }
  465 
  466 static __inline u16 Mk16_le(const u16 *v)
  467 {
  468         return le16toh(*v);
  469 }
  470 
  471 static const u16 Sbox[256] = {
  472         0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154,
  473         0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A,
  474         0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B,
  475         0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B,
  476         0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F,
  477         0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F,
  478         0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5,
  479         0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F,
  480         0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB,
  481         0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397,
  482         0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED,
  483         0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A,
  484         0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194,
  485         0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3,
  486         0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104,
  487         0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D,
  488         0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39,
  489         0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695,
  490         0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83,
  491         0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76,
  492         0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4,
  493         0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B,
  494         0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0,
  495         0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018,
  496         0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751,
  497         0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85,
  498         0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12,
  499         0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9,
  500         0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7,
  501         0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A,
  502         0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8,
  503         0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A,
  504 };
  505 
  506 static __inline u16 _S_(u16 v)
  507 {
  508         u16 t = Sbox[Hi8(v)];
  509         return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8));
  510 }
  511 
  512 #define PHASE1_LOOP_COUNT 8
  513 
  514 static void tkip_mixing_phase1(u16 *TTAK, const u8 *TK, const u8 *TA, u32 IV32)
  515 {
  516         int i, j;
  517 
  518         /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */
  519         TTAK[0] = Lo16(IV32);
  520         TTAK[1] = Hi16(IV32);
  521         TTAK[2] = Mk16(TA[1], TA[0]);
  522         TTAK[3] = Mk16(TA[3], TA[2]);
  523         TTAK[4] = Mk16(TA[5], TA[4]);
  524 
  525         for (i = 0; i < PHASE1_LOOP_COUNT; i++) {
  526                 j = 2 * (i & 1);
  527                 TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j]));
  528                 TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j]));
  529                 TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j]));
  530                 TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j]));
  531                 TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i;
  532         }
  533 }
  534 
  535 #ifndef _BYTE_ORDER
  536 #error "Don't know native byte order"
  537 #endif
  538 
  539 static void tkip_mixing_phase2(u8 *WEPSeed, const u8 *TK, const u16 *TTAK,
  540                                u16 IV16)
  541 {
  542         /* Make temporary area overlap WEP seed so that the final copy can be
  543          * avoided on little endian hosts. */
  544         u16 *PPK = (u16 *) &WEPSeed[4];
  545 
  546         /* Step 1 - make copy of TTAK and bring in TSC */
  547         PPK[0] = TTAK[0];
  548         PPK[1] = TTAK[1];
  549         PPK[2] = TTAK[2];
  550         PPK[3] = TTAK[3];
  551         PPK[4] = TTAK[4];
  552         PPK[5] = TTAK[4] + IV16;
  553 
  554         /* Step 2 - 96-bit bijective mixing using S-box */
  555         PPK[0] += _S_(PPK[5] ^ Mk16_le((const u16 *) &TK[0]));
  556         PPK[1] += _S_(PPK[0] ^ Mk16_le((const u16 *) &TK[2]));
  557         PPK[2] += _S_(PPK[1] ^ Mk16_le((const u16 *) &TK[4]));
  558         PPK[3] += _S_(PPK[2] ^ Mk16_le((const u16 *) &TK[6]));
  559         PPK[4] += _S_(PPK[3] ^ Mk16_le((const u16 *) &TK[8]));
  560         PPK[5] += _S_(PPK[4] ^ Mk16_le((const u16 *) &TK[10]));
  561 
  562         PPK[0] += RotR1(PPK[5] ^ Mk16_le((const u16 *) &TK[12]));
  563         PPK[1] += RotR1(PPK[0] ^ Mk16_le((const u16 *) &TK[14]));
  564         PPK[2] += RotR1(PPK[1]);
  565         PPK[3] += RotR1(PPK[2]);
  566         PPK[4] += RotR1(PPK[3]);
  567         PPK[5] += RotR1(PPK[4]);
  568 
  569         /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value
  570          * WEPSeed[0..2] is transmitted as WEP IV */
  571         WEPSeed[0] = Hi8(IV16);
  572         WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F;
  573         WEPSeed[2] = Lo8(IV16);
  574         WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((const u16 *) &TK[0])) >> 1);
  575 
  576 #if _BYTE_ORDER == _BIG_ENDIAN
  577         {
  578                 int i;
  579                 for (i = 0; i < 6; i++)
  580                         PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8);
  581         }
  582 #endif
  583 }
  584 
  585 static void
  586 wep_encrypt(u8 *key, struct mbuf *m0, u_int off, size_t data_len,
  587         uint8_t icv[IEEE80211_WEP_CRCLEN])
  588 {
  589         u32 i, j, k, crc;
  590         size_t buflen;
  591         u8 S[256];
  592         u8 *pos;
  593         struct mbuf *m;
  594 #define S_SWAP(a,b) do { u8 t = S[a]; S[a] = S[b]; S[b] = t; } while(0)
  595 
  596         /* Setup RC4 state */
  597         for (i = 0; i < 256; i++)
  598                 S[i] = i;
  599         j = 0;
  600         for (i = 0; i < 256; i++) {
  601                 j = (j + S[i] + key[i & 0x0f]) & 0xff;
  602                 S_SWAP(i, j);
  603         }
  604 
  605         /* Compute CRC32 over unencrypted data and apply RC4 to data */
  606         crc = ~0;
  607         i = j = 0;
  608         m = m0;
  609         pos = mtod(m, uint8_t *) + off;
  610         buflen = m->m_len - off;
  611         for (;;) {
  612                 if (buflen > data_len)
  613                         buflen = data_len;
  614                 data_len -= buflen;
  615                 for (k = 0; k < buflen; k++) {
  616                         crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8);
  617                         i = (i + 1) & 0xff;
  618                         j = (j + S[i]) & 0xff;
  619                         S_SWAP(i, j);
  620                         *pos++ ^= S[(S[i] + S[j]) & 0xff];
  621                 }
  622                 m = m->m_next;
  623                 if (m == NULL) {
  624                         KASSERT(data_len == 0,
  625                             ("out of buffers with data_len %zu\n", data_len));
  626                         break;
  627                 }
  628                 pos = mtod(m, uint8_t *);
  629                 buflen = m->m_len;
  630         }
  631         crc = ~crc;
  632 
  633         /* Append little-endian CRC32 and encrypt it to produce ICV */
  634         icv[0] = crc;
  635         icv[1] = crc >> 8;
  636         icv[2] = crc >> 16;
  637         icv[3] = crc >> 24;
  638         for (k = 0; k < IEEE80211_WEP_CRCLEN; k++) {
  639                 i = (i + 1) & 0xff;
  640                 j = (j + S[i]) & 0xff;
  641                 S_SWAP(i, j);
  642                 icv[k] ^= S[(S[i] + S[j]) & 0xff];
  643         }
  644 }
  645 
  646 static int
  647 wep_decrypt(u8 *key, struct mbuf *m, u_int off, size_t data_len)
  648 {
  649         u32 i, j, k, crc;
  650         u8 S[256];
  651         u8 *pos, icv[4];
  652         size_t buflen;
  653 
  654         /* Setup RC4 state */
  655         for (i = 0; i < 256; i++)
  656                 S[i] = i;
  657         j = 0;
  658         for (i = 0; i < 256; i++) {
  659                 j = (j + S[i] + key[i & 0x0f]) & 0xff;
  660                 S_SWAP(i, j);
  661         }
  662 
  663         /* Apply RC4 to data and compute CRC32 over decrypted data */
  664         crc = ~0;
  665         i = j = 0;
  666         pos = mtod(m, uint8_t *) + off;
  667         buflen = m->m_len - off;
  668         for (;;) {
  669                 if (buflen > data_len)
  670                         buflen = data_len;
  671                 data_len -= buflen;
  672                 for (k = 0; k < buflen; k++) {
  673                         i = (i + 1) & 0xff;
  674                         j = (j + S[i]) & 0xff;
  675                         S_SWAP(i, j);
  676                         *pos ^= S[(S[i] + S[j]) & 0xff];
  677                         crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8);
  678                         pos++;
  679                 }
  680                 m = m->m_next;
  681                 if (m == NULL) {
  682                         KASSERT(data_len == 0,
  683                             ("out of buffers with data_len %zu\n", data_len));
  684                         break;
  685                 }
  686                 pos = mtod(m, uint8_t *);
  687                 buflen = m->m_len;
  688         }
  689         crc = ~crc;
  690 
  691         /* Encrypt little-endian CRC32 and verify that it matches with the
  692          * received ICV */
  693         icv[0] = crc;
  694         icv[1] = crc >> 8;
  695         icv[2] = crc >> 16;
  696         icv[3] = crc >> 24;
  697         for (k = 0; k < 4; k++) {
  698                 i = (i + 1) & 0xff;
  699                 j = (j + S[i]) & 0xff;
  700                 S_SWAP(i, j);
  701                 if ((icv[k] ^ S[(S[i] + S[j]) & 0xff]) != *pos++) {
  702                         /* ICV mismatch - drop frame */
  703                         return -1;
  704                 }
  705         }
  706 
  707         return 0;
  708 }
  709 
  710 
  711 static __inline u32 rotl(u32 val, int bits)
  712 {
  713         return (val << bits) | (val >> (32 - bits));
  714 }
  715 
  716 
  717 static __inline u32 rotr(u32 val, int bits)
  718 {
  719         return (val >> bits) | (val << (32 - bits));
  720 }
  721 
  722 
  723 static __inline u32 xswap(u32 val)
  724 {
  725         return ((val & 0x00ff00ff) << 8) | ((val & 0xff00ff00) >> 8);
  726 }
  727 
  728 
  729 #define michael_block(l, r)     \
  730 do {                            \
  731         r ^= rotl(l, 17);       \
  732         l += r;                 \
  733         r ^= xswap(l);          \
  734         l += r;                 \
  735         r ^= rotl(l, 3);        \
  736         l += r;                 \
  737         r ^= rotr(l, 2);        \
  738         l += r;                 \
  739 } while (0)
  740 
  741 
  742 static __inline u32 get_le32_split(u8 b0, u8 b1, u8 b2, u8 b3)
  743 {
  744         return b0 | (b1 << 8) | (b2 << 16) | (b3 << 24);
  745 }
  746 
  747 static __inline u32 get_le32(const u8 *p)
  748 {
  749         return get_le32_split(p[0], p[1], p[2], p[3]);
  750 }
  751 
  752 
  753 static __inline void put_le32(u8 *p, u32 v)
  754 {
  755         p[0] = v;
  756         p[1] = v >> 8;
  757         p[2] = v >> 16;
  758         p[3] = v >> 24;
  759 }
  760 
  761 /*
  762  * Craft pseudo header used to calculate the MIC.
  763  */
  764 static void
  765 michael_mic_hdr(const struct ieee80211_frame *wh0, uint8_t hdr[16])
  766 {
  767         const struct ieee80211_frame_addr4 *wh =
  768                 (const struct ieee80211_frame_addr4 *) wh0;
  769 
  770         switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
  771         case IEEE80211_FC1_DIR_NODS:
  772                 IEEE80211_ADDR_COPY(hdr, wh->i_addr1); /* DA */
  773                 IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr2);
  774                 break;
  775         case IEEE80211_FC1_DIR_TODS:
  776                 IEEE80211_ADDR_COPY(hdr, wh->i_addr3); /* DA */
  777                 IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr2);
  778                 break;
  779         case IEEE80211_FC1_DIR_FROMDS:
  780                 IEEE80211_ADDR_COPY(hdr, wh->i_addr1); /* DA */
  781                 IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr3);
  782                 break;
  783         case IEEE80211_FC1_DIR_DSTODS:
  784                 IEEE80211_ADDR_COPY(hdr, wh->i_addr3); /* DA */
  785                 IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr4);
  786                 break;
  787         }
  788 
  789         if (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_QOS) {
  790                 const struct ieee80211_qosframe *qwh =
  791                         (const struct ieee80211_qosframe *) wh;
  792                 hdr[12] = qwh->i_qos[0] & IEEE80211_QOS_TID;
  793         } else
  794                 hdr[12] = 0;
  795         hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */
  796 }
  797 
  798 static void
  799 michael_mic(struct tkip_ctx *ctx, const u8 *key,
  800         struct mbuf *m, u_int off, size_t data_len,
  801         u8 mic[IEEE80211_WEP_MICLEN])
  802 {
  803         uint8_t hdr[16];
  804         u32 l, r;
  805         const uint8_t *data;
  806         u_int space;
  807 
  808         michael_mic_hdr(mtod(m, struct ieee80211_frame *), hdr);
  809 
  810         l = get_le32(key);
  811         r = get_le32(key + 4);
  812 
  813         /* Michael MIC pseudo header: DA, SA, 3 x 0, Priority */
  814         l ^= get_le32(hdr);
  815         michael_block(l, r);
  816         l ^= get_le32(&hdr[4]);
  817         michael_block(l, r);
  818         l ^= get_le32(&hdr[8]);
  819         michael_block(l, r);
  820         l ^= get_le32(&hdr[12]);
  821         michael_block(l, r);
  822 
  823         /* first buffer has special handling */
  824         data = mtod(m, const uint8_t *) + off;
  825         space = m->m_len - off;
  826         for (;;) {
  827                 if (space > data_len)
  828                         space = data_len;
  829                 /* collect 32-bit blocks from current buffer */
  830                 while (space >= sizeof(uint32_t)) {
  831                         l ^= get_le32(data);
  832                         michael_block(l, r);
  833                         data += sizeof(uint32_t), space -= sizeof(uint32_t);
  834                         data_len -= sizeof(uint32_t);
  835                 }
  836                 if (data_len < sizeof(uint32_t))
  837                         break;
  838                 m = m->m_next;
  839                 if (m == NULL) {
  840                         KASSERT(0, ("out of data, data_len %zu\n", data_len));
  841                         break;
  842                 }
  843                 if (space != 0) {
  844                         const uint8_t *data_next;
  845                         /*
  846                          * Block straddles buffers, split references.
  847                          */
  848                         data_next = mtod(m, const uint8_t *);
  849                         KASSERT(m->m_len >= sizeof(uint32_t) - space,
  850                                 ("not enough data in following buffer, "
  851                                 "m_len %u need %zu\n", m->m_len,
  852                                 sizeof(uint32_t) - space));
  853                         switch (space) {
  854                         case 1:
  855                                 l ^= get_le32_split(data[0], data_next[0],
  856                                         data_next[1], data_next[2]);
  857                                 data = data_next + 3;
  858                                 space = m->m_len - 3;
  859                                 break;
  860                         case 2:
  861                                 l ^= get_le32_split(data[0], data[1],
  862                                         data_next[0], data_next[1]);
  863                                 data = data_next + 2;
  864                                 space = m->m_len - 2;
  865                                 break;
  866                         case 3:
  867                                 l ^= get_le32_split(data[0], data[1],
  868                                         data[2], data_next[0]);
  869                                 data = data_next + 1;
  870                                 space = m->m_len - 1;
  871                                 break;
  872                         }
  873                         michael_block(l, r);
  874                         data_len -= sizeof(uint32_t);
  875                 } else {
  876                         /*
  877                          * Setup for next buffer.
  878                          */
  879                         data = mtod(m, const uint8_t *);
  880                         space = m->m_len;
  881                 }
  882         }
  883         /* Last block and padding (0x5a, 4..7 x 0) */
  884         switch (data_len) {
  885         case 0:
  886                 l ^= get_le32_split(0x5a, 0, 0, 0);
  887                 break;
  888         case 1:
  889                 l ^= get_le32_split(data[0], 0x5a, 0, 0);
  890                 break;
  891         case 2:
  892                 l ^= get_le32_split(data[0], data[1], 0x5a, 0);
  893                 break;
  894         case 3:
  895                 l ^= get_le32_split(data[0], data[1], data[2], 0x5a);
  896                 break;
  897         }
  898         michael_block(l, r);
  899         /* l ^= 0; */
  900         michael_block(l, r);
  901 
  902         put_le32(mic, l);
  903         put_le32(mic + 4, r);
  904 }
  905 
  906 static int
  907 tkip_encrypt(struct tkip_ctx *ctx, struct ieee80211_key *key,
  908         struct mbuf *m, int hdrlen)
  909 {
  910         struct ieee80211_frame *wh;
  911         uint8_t icv[IEEE80211_WEP_CRCLEN];
  912 
  913         ctx->tc_ic->ic_stats.is_crypto_tkip++;
  914 
  915         wh = mtod(m, struct ieee80211_frame *);
  916         if (!ctx->tx_phase1_done) {
  917                 tkip_mixing_phase1(ctx->tx_ttak, key->wk_key, wh->i_addr2,
  918                                    (u32)(key->wk_keytsc >> 16));
  919                 ctx->tx_phase1_done = 1;
  920         }
  921         tkip_mixing_phase2(ctx->tx_rc4key, key->wk_key, ctx->tx_ttak,
  922                 (u16) key->wk_keytsc);
  923 
  924         wep_encrypt(ctx->tx_rc4key,
  925                 m, hdrlen + tkip.ic_header,
  926                 m->m_pkthdr.len - (hdrlen + tkip.ic_header),
  927                 icv);
  928         (void) m_append(m, IEEE80211_WEP_CRCLEN, icv);  /* XXX check return */
  929 
  930         key->wk_keytsc++;
  931         if ((u16)(key->wk_keytsc) == 0)
  932                 ctx->tx_phase1_done = 0;
  933         return 1;
  934 }
  935 
  936 static int
  937 tkip_decrypt(struct tkip_ctx *ctx, struct ieee80211_key *key,
  938         struct mbuf *m, int hdrlen)
  939 {
  940         struct ieee80211_frame *wh;
  941         u32 iv32;
  942         u16 iv16;
  943 
  944         ctx->tc_ic->ic_stats.is_crypto_tkip++;
  945 
  946         wh = mtod(m, struct ieee80211_frame *);
  947         /* NB: tkip_decap already verified header and left seq in rx_rsc */
  948         iv16 = (u16) ctx->rx_rsc;
  949         iv32 = (u32) (ctx->rx_rsc >> 16);
  950 
  951         if (iv32 != (u32)(key->wk_keyrsc >> 16) || !ctx->rx_phase1_done) {
  952                 tkip_mixing_phase1(ctx->rx_ttak, key->wk_key,
  953                         wh->i_addr2, iv32);
  954                 ctx->rx_phase1_done = 1;
  955         }
  956         tkip_mixing_phase2(ctx->rx_rc4key, key->wk_key, ctx->rx_ttak, iv16);
  957 
  958         /* NB: m is unstripped; deduct headers + ICV to get payload */
  959         if (wep_decrypt(ctx->rx_rc4key,
  960                 m, hdrlen + tkip.ic_header,
  961                 m->m_pkthdr.len - (hdrlen + tkip.ic_header + tkip.ic_trailer))) {
  962                 if (iv32 != (u32)(key->wk_keyrsc >> 16)) {
  963                         /* Previously cached Phase1 result was already lost, so
  964                          * it needs to be recalculated for the next packet. */
  965                         ctx->rx_phase1_done = 0;
  966                 }
  967                 IEEE80211_DPRINTF(ctx->tc_ic, IEEE80211_MSG_CRYPTO,
  968                     "[%s] TKIP ICV mismatch on decrypt\n",
  969                     ether_sprintf(wh->i_addr2));
  970                 ctx->tc_ic->ic_stats.is_rx_tkipicv++;
  971                 return 0;
  972         }
  973         return 1;
  974 }
  975 
  976 /*
  977  * Module glue.
  978  */
  979 static int
  980 tkip_modevent(module_t mod, int type, void *unused)
  981 {
  982         switch (type) {
  983         case MOD_LOAD:
  984                 ieee80211_crypto_register(&tkip);
  985                 return 0;
  986         case MOD_UNLOAD:
  987         case MOD_QUIESCE:
  988                 if (nrefs) {
  989                         printf("wlan_tkip: still in use (%u dynamic refs)\n",
  990                                 nrefs);
  991                         return EBUSY;
  992                 }
  993                 if (type == MOD_UNLOAD)
  994                         ieee80211_crypto_unregister(&tkip);
  995                 return 0;
  996         }
  997         return EINVAL;
  998 }
  999 
 1000 static moduledata_t tkip_mod = {
 1001         "wlan_tkip",
 1002         tkip_modevent,
 1003         0
 1004 };
 1005 DECLARE_MODULE(wlan_tkip, tkip_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
 1006 MODULE_VERSION(wlan_tkip, 1);
 1007 MODULE_DEPEND(wlan_tkip, wlan, 1, 1, 1);

Cache object: 7bfb27072cf23a810d667c9c7d617b0a


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