The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211.c

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    1 /*      $NetBSD: ieee80211.c,v 1.9.2.2 2004/07/23 23:28:59 he Exp $     */
    2 /*-
    3  * Copyright (c) 2001 Atsushi Onoe
    4  * Copyright (c) 2002, 2003 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  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission.
   17  *
   18  * Alternatively, this software may be distributed under the terms of the
   19  * GNU General Public License ("GPL") version 2 as published by the Free
   20  * Software Foundation.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 #ifdef __FreeBSD__
   36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211.c,v 1.8 2003/09/14 22:32:18 sam Exp $");
   37 #else
   38 __KERNEL_RCSID(0, "$NetBSD: ieee80211.c,v 1.9.2.2 2004/07/23 23:28:59 he Exp $");
   39 #endif
   40 
   41 /*
   42  * IEEE 802.11 generic handler
   43  */
   44 
   45 #include "opt_inet.h"
   46 #include "bpfilter.h"
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h> 
   50 #include <sys/mbuf.h>   
   51 #include <sys/malloc.h>
   52 #include <sys/kernel.h>
   53 #include <sys/socket.h>
   54 #include <sys/sockio.h>
   55 #include <sys/endian.h>
   56 #include <sys/errno.h>
   57 #ifdef __FreeBSD__
   58 #include <sys/bus.h>
   59 #endif
   60 #include <sys/proc.h>
   61 #include <sys/sysctl.h>
   62 
   63 #ifdef __FreeBSD__
   64 #include <machine/atomic.h>
   65 #endif
   66  
   67 #include <net/if.h>
   68 #include <net/if_dl.h>
   69 #include <net/if_media.h>
   70 #include <net/if_arp.h>
   71 #ifdef __FreeBSD__
   72 #include <net/ethernet.h>
   73 #else
   74 #include <net/if_ether.h>
   75 #endif
   76 #include <net/if_llc.h>
   77 
   78 #include <net80211/ieee80211_var.h>
   79 #include <net80211/ieee80211_compat.h>
   80 
   81 #include <net/bpf.h>
   82 
   83 #ifdef INET
   84 #include <netinet/in.h> 
   85 #ifdef __FreeBSD__
   86 #include <netinet/if_ether.h>
   87 #else
   88 #include <net/if_ether.h>
   89 #endif
   90 #endif
   91 
   92 #ifdef IEEE80211_DEBUG
   93 int     ieee80211_debug = 0;
   94 #ifdef __FreeBSD__
   95 SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug,
   96             0, "IEEE 802.11 media debugging printfs");
   97 #endif
   98 #endif
   99 
  100 static void ieee80211_setbasicrates(struct ieee80211com *);
  101 
  102 static const char *
  103 ieee80211_phymode_name(enum ieee80211_phymode mode)
  104 {
  105         int i;
  106         struct {
  107                 enum ieee80211_phymode mode;
  108                 const char *name;
  109         } modenames[] = {
  110                 { IEEE80211_MODE_AUTO,  "auto" },
  111                 { IEEE80211_MODE_11A,   "11a" },
  112                 { IEEE80211_MODE_11B,   "11b" },
  113                 { IEEE80211_MODE_11G,   "11g" },
  114                 { IEEE80211_MODE_FH,    "FH" },
  115                 { IEEE80211_MODE_TURBO,  "turbo" }
  116         };
  117         for (i = 0; i < sizeof(modenames) / sizeof(modenames[0]); i++) {
  118                 if (mode == modenames[i].mode)
  119                         return modenames[i].name;
  120         }
  121         return "<unknown>";
  122 }
  123 
  124 void
  125 ieee80211_ifattach(struct ifnet *ifp)
  126 {
  127         struct ieee80211com *ic = (void *)ifp;
  128         struct ieee80211_channel *c;
  129         int i;
  130 
  131         ether_ifattach(ifp, ic->ic_myaddr);
  132 #if NBPFILTER > 0
  133         bpfattach2(ifp, DLT_IEEE802_11,
  134             sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf);
  135 #endif
  136         ieee80211_crypto_attach(ifp);
  137 
  138         /*
  139          * Fill in 802.11 available channel set, mark
  140          * all available channels as active, and pick
  141          * a default channel if not already specified.
  142          */
  143         memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
  144         ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO;
  145         for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
  146                 c = &ic->ic_channels[i];
  147                 if (c->ic_flags) {
  148                         /*
  149                          * Verify driver passed us valid data.
  150                          */
  151                         if (i != ieee80211_chan2ieee(ic, c)) {
  152                                 if_printf(ifp, "bad channel ignored; "
  153                                         "freq %u flags %x number %u\n",
  154                                         c->ic_freq, c->ic_flags, i);
  155                                 c->ic_flags = 0;        /* NB: remove */
  156                                 continue;
  157                         }
  158                         setbit(ic->ic_chan_avail, i);
  159                         /*
  160                          * Identify mode capabilities.
  161                          */
  162                         if (IEEE80211_IS_CHAN_A(c))
  163                                 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A;
  164                         if (IEEE80211_IS_CHAN_B(c))
  165                                 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B;
  166                         if (IEEE80211_IS_CHAN_PUREG(c))
  167                                 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G;
  168                         if (IEEE80211_IS_CHAN_FHSS(c))
  169                                 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH;
  170                         if (IEEE80211_IS_CHAN_T(c))
  171                                 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO;
  172                 }
  173         }
  174         /* validate ic->ic_curmode */
  175         if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0)
  176                 ic->ic_curmode = IEEE80211_MODE_AUTO;
  177 
  178         ieee80211_setbasicrates(ic);
  179         (void) ieee80211_setmode(ic, ic->ic_curmode);
  180 
  181         ic->ic_des_chan = IEEE80211_CHAN_ANYC;  /* any channel is ok */
  182         if (ic->ic_lintval == 0)
  183                 ic->ic_lintval = 100;           /* default sleep */
  184         ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */
  185 
  186         ieee80211_node_attach(ifp);
  187         ieee80211_proto_attach(ifp);
  188 }
  189 
  190 void
  191 ieee80211_ifdetach(struct ifnet *ifp)
  192 {
  193         struct ieee80211com *ic = (void *)ifp;
  194 
  195         ieee80211_proto_detach(ifp);
  196         ieee80211_crypto_detach(ifp);
  197         ieee80211_node_detach(ifp);
  198 #ifdef __FreeBSD__
  199         ifmedia_removeall(&ic->ic_media);
  200 #else
  201         ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY);
  202 #endif
  203 #if NBPFILTER > 0
  204         bpfdetach(ifp);
  205 #endif
  206         ether_ifdetach(ifp);
  207 }
  208 
  209 /*
  210  * Convert MHz frequency to IEEE channel number.
  211  */
  212 u_int
  213 ieee80211_mhz2ieee(u_int freq, u_int flags)
  214 {
  215         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  216                 if (freq == 2484)
  217                         return 14;
  218                 if (freq < 2484)
  219                         return (freq - 2407) / 5;
  220                 else
  221                         return 15 + ((freq - 2512) / 20);
  222         } else if (flags & IEEE80211_CHAN_5GHZ) {       /* 5Ghz band */
  223                 return (freq - 5000) / 5;
  224         } else {                                /* either, guess */
  225                 if (freq == 2484)
  226                         return 14;
  227                 if (freq < 2484)
  228                         return (freq - 2407) / 5;
  229                 if (freq < 5000)
  230                         return 15 + ((freq - 2512) / 20);
  231                 return (freq - 5000) / 5;
  232         }
  233 }
  234 
  235 /*
  236  * Convert channel to IEEE channel number.
  237  */
  238 u_int
  239 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c)
  240 {
  241         if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX])
  242                 return c - ic->ic_channels;
  243         else if (c == IEEE80211_CHAN_ANYC)
  244                 return IEEE80211_CHAN_ANY;
  245         else if (c != NULL) {
  246                 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n",
  247                         c->ic_freq, c->ic_flags);
  248                 return 0;               /* XXX */
  249         } else {
  250                 if_printf(&ic->ic_if, "invalid channel (NULL)\n");
  251                 return 0;               /* XXX */
  252         }
  253 }
  254 
  255 /*
  256  * Convert IEEE channel number to MHz frequency.
  257  */
  258 u_int
  259 ieee80211_ieee2mhz(u_int chan, u_int flags)
  260 {
  261         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  262                 if (chan == 14)
  263                         return 2484;
  264                 if (chan < 14)
  265                         return 2407 + chan*5;
  266                 else
  267                         return 2512 + ((chan-15)*20);
  268         } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
  269                 return 5000 + (chan*5);
  270         } else {                                /* either, guess */
  271                 if (chan == 14)
  272                         return 2484;
  273                 if (chan < 14)                  /* 0-13 */
  274                         return 2407 + chan*5;
  275                 if (chan < 27)                  /* 15-26 */
  276                         return 2512 + ((chan-15)*20);
  277                 return 5000 + (chan*5);
  278         }
  279 }
  280 
  281 /*
  282  * Setup the media data structures according to the channel and
  283  * rate tables.  This must be called by the driver after
  284  * ieee80211_attach and before most anything else.
  285  */
  286 void
  287 ieee80211_media_init(struct ifnet *ifp,
  288         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
  289 {
  290 #define ADD(_ic, _s, _o) \
  291         ifmedia_add(&(_ic)->ic_media, \
  292                 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
  293         struct ieee80211com *ic = (void *)ifp;
  294         struct ifmediareq imr;
  295         int i, j, mode, rate, maxrate, mword, mopt, r;
  296         struct ieee80211_rateset *rs;
  297         struct ieee80211_rateset allrates;
  298 
  299         /*
  300          * Do late attach work that must wait for any subclass
  301          * (i.e. driver) work such as overriding methods.
  302          */
  303         ieee80211_node_lateattach(ifp);
  304 
  305         /*
  306          * Fill in media characteristics.
  307          */
  308         ifmedia_init(&ic->ic_media, 0, media_change, media_stat);
  309         maxrate = 0;
  310         memset(&allrates, 0, sizeof(allrates));
  311         for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) {
  312                 static const u_int mopts[] = { 
  313                         IFM_AUTO,
  314                         IFM_IEEE80211_11A,
  315                         IFM_IEEE80211_11B,
  316                         IFM_IEEE80211_11G,
  317                         IFM_IEEE80211_FH,
  318                         IFM_IEEE80211_11A | IFM_IEEE80211_TURBO,
  319                 };
  320                 if ((ic->ic_modecaps & (1<<mode)) == 0)
  321                         continue;
  322                 mopt = mopts[mode];
  323                 ADD(ic, IFM_AUTO, mopt);        /* e.g. 11a auto */
  324                 if (ic->ic_caps & IEEE80211_C_IBSS)
  325                         ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC);
  326                 if (ic->ic_caps & IEEE80211_C_HOSTAP)
  327                         ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP);
  328                 if (ic->ic_caps & IEEE80211_C_AHDEMO)
  329                         ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
  330                 if (ic->ic_caps & IEEE80211_C_MONITOR)
  331                         ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR);
  332                 if (mode == IEEE80211_MODE_AUTO)
  333                         continue;
  334                 if_printf(ifp, "%s rates: ", ieee80211_phymode_name(mode));
  335                 rs = &ic->ic_sup_rates[mode];
  336                 for (i = 0; i < rs->rs_nrates; i++) {
  337                         rate = rs->rs_rates[i];
  338                         mword = ieee80211_rate2media(ic, rate, mode);
  339                         if (mword == 0)
  340                                 continue;
  341                         printf("%s%d%sMbps", (i != 0 ? " " : ""),
  342                             (rate & IEEE80211_RATE_VAL) / 2,
  343                             ((rate & 0x1) != 0 ? ".5" : ""));
  344                         ADD(ic, mword, mopt);
  345                         if (ic->ic_caps & IEEE80211_C_IBSS)
  346                                 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC);
  347                         if (ic->ic_caps & IEEE80211_C_HOSTAP)
  348                                 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP);
  349                         if (ic->ic_caps & IEEE80211_C_AHDEMO)
  350                                 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
  351                         if (ic->ic_caps & IEEE80211_C_MONITOR)
  352                                 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR);
  353                         /*
  354                          * Add rate to the collection of all rates.
  355                          */
  356                         r = rate & IEEE80211_RATE_VAL;
  357                         for (j = 0; j < allrates.rs_nrates; j++)
  358                                 if (allrates.rs_rates[j] == r)
  359                                         break;
  360                         if (j == allrates.rs_nrates) {
  361                                 /* unique, add to the set */
  362                                 allrates.rs_rates[j] = r;
  363                                 allrates.rs_nrates++;
  364                         }
  365                         rate = (rate & IEEE80211_RATE_VAL) / 2;
  366                         if (rate > maxrate)
  367                                 maxrate = rate;
  368                 }
  369                 printf("\n");
  370         }
  371         for (i = 0; i < allrates.rs_nrates; i++) {
  372                 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
  373                                 IEEE80211_MODE_AUTO);
  374                 if (mword == 0)
  375                         continue;
  376                 mword = IFM_SUBTYPE(mword);     /* remove media options */
  377                 ADD(ic, mword, 0);
  378                 if (ic->ic_caps & IEEE80211_C_IBSS)
  379                         ADD(ic, mword, IFM_IEEE80211_ADHOC);
  380                 if (ic->ic_caps & IEEE80211_C_HOSTAP)
  381                         ADD(ic, mword, IFM_IEEE80211_HOSTAP);
  382                 if (ic->ic_caps & IEEE80211_C_AHDEMO)
  383                         ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0);
  384                 if (ic->ic_caps & IEEE80211_C_MONITOR)
  385                         ADD(ic, mword, IFM_IEEE80211_MONITOR);
  386         }
  387         ieee80211_media_status(ifp, &imr);
  388         ifmedia_set(&ic->ic_media, imr.ifm_active);
  389 
  390         if (maxrate)
  391                 ifp->if_baudrate = IF_Mbps(maxrate);
  392 
  393         if (ic->ic_max_aid == 0)
  394                 ic->ic_max_aid = IEEE80211_MAX_AID;
  395 
  396 #undef ADD
  397 }
  398 
  399 static int
  400 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate)
  401 {
  402 #define IEEERATE(_ic,_m,_i) \
  403         ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL)
  404         int i, nrates = ic->ic_sup_rates[mode].rs_nrates;
  405         for (i = 0; i < nrates; i++)
  406                 if (IEEERATE(ic, mode, i) == rate)
  407                         return i;
  408         return -1;
  409 #undef IEEERATE
  410 }
  411 
  412 /*
  413  * Handle a media change request.
  414  */
  415 int
  416 ieee80211_media_change(struct ifnet *ifp)
  417 {
  418         struct ieee80211com *ic = (void *)ifp;
  419         struct ifmedia_entry *ime;
  420         enum ieee80211_opmode newopmode;
  421         enum ieee80211_phymode newphymode;
  422         int i, j, newrate, error = 0;
  423 
  424         ime = ic->ic_media.ifm_cur;
  425         /*
  426          * First, identify the phy mode.
  427          */
  428         switch (IFM_MODE(ime->ifm_media)) {
  429         case IFM_IEEE80211_11A:
  430                 newphymode = IEEE80211_MODE_11A;
  431                 break;
  432         case IFM_IEEE80211_11B:
  433                 newphymode = IEEE80211_MODE_11B;
  434                 break;
  435         case IFM_IEEE80211_11G:
  436                 newphymode = IEEE80211_MODE_11G;
  437                 break;
  438         case IFM_IEEE80211_FH:
  439                 newphymode = IEEE80211_MODE_FH;
  440                 break;
  441         case IFM_AUTO:
  442                 newphymode = IEEE80211_MODE_AUTO;
  443                 break;
  444         default:
  445                 return EINVAL;
  446         }
  447         /*
  448          * Turbo mode is an ``option''.  Eventually it
  449          * needs to be applied to 11g too.
  450          */
  451         if (ime->ifm_media & IFM_IEEE80211_TURBO) {
  452                 if (newphymode != IEEE80211_MODE_11A)
  453                         return EINVAL;
  454                 newphymode = IEEE80211_MODE_TURBO;
  455         }
  456         /*
  457          * Validate requested mode is available.
  458          */
  459         if ((ic->ic_modecaps & (1<<newphymode)) == 0)
  460                 return EINVAL;
  461 
  462         /*
  463          * Next, the fixed/variable rate.
  464          */
  465         i = -1;
  466         if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) {
  467                 /*
  468                  * Convert media subtype to rate.
  469                  */
  470                 newrate = ieee80211_media2rate(ime->ifm_media);
  471                 if (newrate == 0)
  472                         return EINVAL;
  473                 /*
  474                  * Check the rate table for the specified/current phy.
  475                  */
  476                 if (newphymode == IEEE80211_MODE_AUTO) {
  477                         /*
  478                          * In autoselect mode search for the rate.
  479                          */
  480                         for (j = IEEE80211_MODE_11A;
  481                              j < IEEE80211_MODE_MAX; j++) {
  482                                 if ((ic->ic_modecaps & (1<<j)) == 0)
  483                                         continue;
  484                                 i = findrate(ic, j, newrate);
  485                                 if (i != -1) {
  486                                         /* lock mode too */
  487                                         newphymode = j;
  488                                         break;
  489                                 }
  490                         }
  491                 } else {
  492                         i = findrate(ic, newphymode, newrate);
  493                 }
  494                 if (i == -1)                    /* mode/rate mismatch */
  495                         return EINVAL;
  496         }
  497         /* NB: defer rate setting to later */
  498 
  499         /*
  500          * Deduce new operating mode but don't install it just yet.
  501          */
  502         if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) ==
  503             (IFM_IEEE80211_ADHOC|IFM_FLAG0))
  504                 newopmode = IEEE80211_M_AHDEMO;
  505         else if (ime->ifm_media & IFM_IEEE80211_HOSTAP)
  506                 newopmode = IEEE80211_M_HOSTAP;
  507         else if (ime->ifm_media & IFM_IEEE80211_ADHOC)
  508                 newopmode = IEEE80211_M_IBSS;
  509         else if (ime->ifm_media & IFM_IEEE80211_MONITOR)
  510                 newopmode = IEEE80211_M_MONITOR;
  511         else
  512                 newopmode = IEEE80211_M_STA;
  513 
  514         /*
  515          * Autoselect doesn't make sense when operating as an AP.
  516          * If no phy mode has been selected, pick one and lock it
  517          * down so rate tables can be used in forming beacon frames
  518          * and the like.
  519          */
  520         if (newopmode == IEEE80211_M_HOSTAP &&
  521             newphymode == IEEE80211_MODE_AUTO) {
  522                 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++)
  523                         if (ic->ic_modecaps & (1<<j)) {
  524                                 newphymode = j;
  525                                 break;
  526                         }
  527         }
  528 
  529         /*
  530          * Handle phy mode change.
  531          */
  532         if (ic->ic_curmode != newphymode) {             /* change phy mode */
  533                 error = ieee80211_setmode(ic, newphymode);
  534                 if (error != 0)
  535                         return error;
  536                 error = ENETRESET;
  537         }
  538 
  539         /*
  540          * Committed to changes, install the rate setting.
  541          */
  542         if (ic->ic_fixed_rate != i) {
  543                 ic->ic_fixed_rate = i;                  /* set fixed tx rate */
  544                 error = ENETRESET;
  545         }
  546 
  547         /*
  548          * Handle operating mode change.
  549          */
  550         if (ic->ic_opmode != newopmode) {
  551                 ic->ic_opmode = newopmode;
  552                 switch (newopmode) {
  553                 case IEEE80211_M_AHDEMO:
  554                 case IEEE80211_M_HOSTAP:
  555                 case IEEE80211_M_STA:
  556                 case IEEE80211_M_MONITOR:
  557                         ic->ic_flags &= ~IEEE80211_F_IBSSON;
  558                         break;
  559                 case IEEE80211_M_IBSS:
  560                         ic->ic_flags |= IEEE80211_F_IBSSON;
  561                         break;
  562                 }
  563                 error = ENETRESET;
  564         }
  565 #ifdef notdef
  566         if (error == 0)
  567                 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media);
  568 #endif
  569         return error;
  570 }
  571 
  572 void
  573 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
  574 {
  575         struct ieee80211com *ic = (void *)ifp;
  576         struct ieee80211_node *ni = NULL;
  577 
  578         imr->ifm_status = IFM_AVALID;
  579         imr->ifm_active = IFM_IEEE80211;
  580         if (ic->ic_state == IEEE80211_S_RUN)
  581                 imr->ifm_status |= IFM_ACTIVE;
  582         imr->ifm_active |= IFM_AUTO;
  583         switch (ic->ic_opmode) {
  584         case IEEE80211_M_STA:
  585                 ni = ic->ic_bss;
  586                 /* calculate rate subtype */
  587                 imr->ifm_active |= ieee80211_rate2media(ic,
  588                         ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode);
  589                 break;
  590         case IEEE80211_M_IBSS:
  591                 imr->ifm_active |= IFM_IEEE80211_ADHOC;
  592                 break;
  593         case IEEE80211_M_AHDEMO:
  594                 /* should not come here */
  595                 break;
  596         case IEEE80211_M_HOSTAP:
  597                 imr->ifm_active |= IFM_IEEE80211_HOSTAP;
  598                 break;
  599         case IEEE80211_M_MONITOR:
  600                 imr->ifm_active |= IFM_IEEE80211_MONITOR;
  601                 break;
  602         }
  603         switch (ic->ic_curmode) {
  604         case IEEE80211_MODE_11A:
  605                 imr->ifm_active |= IFM_IEEE80211_11A;
  606                 break;
  607         case IEEE80211_MODE_11B:
  608                 imr->ifm_active |= IFM_IEEE80211_11B;
  609                 break;
  610         case IEEE80211_MODE_11G:
  611                 imr->ifm_active |= IFM_IEEE80211_11G;
  612                 break;
  613         case IEEE80211_MODE_FH:
  614                 imr->ifm_active |= IFM_IEEE80211_FH;
  615                 break;
  616         case IEEE80211_MODE_TURBO:
  617                 imr->ifm_active |= IFM_IEEE80211_11A
  618                                 |  IFM_IEEE80211_TURBO;
  619                 break;
  620         }
  621 }
  622 
  623 void
  624 ieee80211_watchdog(struct ifnet *ifp)
  625 {
  626         struct ieee80211com *ic = (void *)ifp;
  627 
  628         if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0)
  629                 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
  630         if (ic->ic_inact_timer && --ic->ic_inact_timer == 0)
  631                 ieee80211_timeout_nodes(ic);
  632 
  633         if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0)
  634                 ifp->if_timer = 1;
  635 }
  636 
  637 /*
  638  * Mark the basic rates for the 11g rate table based on the
  639  * operating mode.  For real 11g we mark all the 11b rates
  640  * and 6, 12, and 24 OFDM.  For 11b compatibility we mark only
  641  * 11b rates.  There's also a pseudo 11a-mode used to mark only
  642  * the basic OFDM rates.
  643  */
  644 static void
  645 ieee80211_setbasicrates(struct ieee80211com *ic)
  646 {
  647         static const struct ieee80211_rateset basic[] = {
  648             { 0 },                              /* IEEE80211_MODE_AUTO */
  649             { 3, { 12, 24, 48 } },              /* IEEE80211_MODE_11A */
  650             { 2, { 2, 4 } },                    /* IEEE80211_MODE_11B */
  651             { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */
  652             { 2, { 2, 4 } },                    /* IEEE80211_MODE_FH */
  653             { 0 },                              /* IEEE80211_MODE_TURBO */
  654         };
  655         enum ieee80211_phymode mode;
  656         struct ieee80211_rateset *rs;
  657         int i, j;
  658 
  659         for (mode = 0; mode < IEEE80211_MODE_MAX; mode++) {
  660                 rs = &ic->ic_sup_rates[mode];
  661                 for (i = 0; i < rs->rs_nrates; i++) {
  662                         rs->rs_rates[i] &= IEEE80211_RATE_VAL;
  663                         for (j = 0; j < basic[mode].rs_nrates; j++)
  664                                 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) {
  665                                         rs->rs_rates[i] |= IEEE80211_RATE_BASIC;
  666                                         break;
  667                                 }
  668                 }
  669         }
  670 }
  671 
  672 /*
  673  * Set the current phy mode and recalculate the active channel
  674  * set based on the available channels for this mode.  Also
  675  * select a new default/current channel if the current one is
  676  * inappropriate for this mode.
  677  */
  678 int
  679 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
  680 {
  681 #define N(a)    (sizeof(a) / sizeof(a[0]))
  682         static const u_int chanflags[] = {
  683                 0,                      /* IEEE80211_MODE_AUTO */
  684                 IEEE80211_CHAN_A,       /* IEEE80211_MODE_11A */
  685                 IEEE80211_CHAN_B,       /* IEEE80211_MODE_11B */
  686                 IEEE80211_CHAN_PUREG,   /* IEEE80211_MODE_11G */
  687                 IEEE80211_CHAN_FHSS,    /* IEEE80211_MODE_FH */
  688                 IEEE80211_CHAN_T,       /* IEEE80211_MODE_TURBO */
  689         };
  690         struct ieee80211_channel *c;
  691         u_int modeflags;
  692         int i;
  693 
  694         /* validate new mode */
  695         if ((ic->ic_modecaps & (1<<mode)) == 0) {
  696                 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n",
  697                         __func__, mode, ic->ic_modecaps));
  698                 return EINVAL;
  699         }
  700 
  701         /*
  702          * Verify at least one channel is present in the available
  703          * channel list before committing to the new mode.
  704          */
  705         IASSERT(mode < N(chanflags), ("Unexpected mode %u\n", mode));
  706         modeflags = chanflags[mode];
  707         for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
  708                 c = &ic->ic_channels[i];
  709                 if (mode == IEEE80211_MODE_AUTO) {
  710                         /* ignore turbo channels for autoselect */
  711                         if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
  712                                 break;
  713                 } else {
  714                         if ((c->ic_flags & modeflags) == modeflags)
  715                                 break;
  716                 }
  717         }
  718         if (i > IEEE80211_CHAN_MAX) {
  719                 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n",
  720                         __func__, mode));
  721                 return EINVAL;
  722         }
  723 
  724         /*
  725          * Calculate the active channel set.
  726          */
  727         memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active));
  728         for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
  729                 c = &ic->ic_channels[i];
  730                 if (mode == IEEE80211_MODE_AUTO) {
  731                         /* take anything but pure turbo channels */
  732                         if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
  733                                 setbit(ic->ic_chan_active, i);
  734                 } else {
  735                         if ((c->ic_flags & modeflags) == modeflags)
  736                                 setbit(ic->ic_chan_active, i);
  737                 }
  738         }
  739         /*
  740          * If no current/default channel is setup or the current
  741          * channel is wrong for the mode then pick the first
  742          * available channel from the active list.  This is likely
  743          * not the right one.
  744          */
  745         if (ic->ic_ibss_chan == NULL ||
  746             isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) {
  747                 for (i = 0; i <= IEEE80211_CHAN_MAX; i++)
  748                         if (isset(ic->ic_chan_active, i)) {
  749                                 ic->ic_ibss_chan = &ic->ic_channels[i];
  750                                 break;
  751                         }
  752                 IASSERT(ic->ic_ibss_chan != NULL &&
  753                     isset(ic->ic_chan_active,
  754                         ieee80211_chan2ieee(ic, ic->ic_ibss_chan)),
  755                     ("Bad IBSS channel %u\n",
  756                      ieee80211_chan2ieee(ic, ic->ic_ibss_chan)));
  757         }
  758 
  759         /*
  760          * Set/reset state flags that influence beacon contents, etc.
  761          *
  762          * XXX what if we have stations already associated???
  763          * XXX probably not right for autoselect?
  764          */
  765         if (ic->ic_caps & IEEE80211_C_SHPREAMBLE)
  766                 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
  767         if (mode == IEEE80211_MODE_11G) {
  768                 if (ic->ic_caps & IEEE80211_C_SHSLOT)
  769                         ic->ic_flags |= IEEE80211_F_SHSLOT;
  770         } else
  771                 ic->ic_flags &= ~IEEE80211_F_SHSLOT;
  772 
  773         ic->ic_curmode = mode;
  774         return 0;
  775 #undef N
  776 }
  777 
  778 /*
  779  * Return the phy mode for with the specified channel so the
  780  * caller can select a rate set.  This is problematic and the
  781  * work here assumes how things work elsewhere in this code.
  782  *
  783  * XXX never returns turbo modes -dcy
  784  */
  785 enum ieee80211_phymode
  786 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan)
  787 {
  788         /*
  789          * NB: this assumes the channel would not be supplied to us
  790          *     unless it was already compatible with the current mode.
  791          */
  792         if (ic->ic_curmode != IEEE80211_MODE_AUTO ||
  793             chan == IEEE80211_CHAN_ANYC)
  794                 return ic->ic_curmode;
  795         /*
  796          * In autoselect mode; deduce a mode based on the channel
  797          * characteristics.  We assume that turbo-only channels
  798          * are not considered when the channel set is constructed.
  799          */
  800         if (IEEE80211_IS_CHAN_5GHZ(chan))
  801                 return IEEE80211_MODE_11A;
  802         else if (IEEE80211_IS_CHAN_FHSS(chan))
  803                 return IEEE80211_MODE_FH;
  804         else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN))
  805                 return IEEE80211_MODE_11G;
  806         else
  807                 return IEEE80211_MODE_11B;
  808 }
  809 
  810 /*
  811  * convert IEEE80211 rate value to ifmedia subtype.
  812  * ieee80211 rate is in unit of 0.5Mbps.
  813  */
  814 int
  815 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
  816 {
  817 #define N(a)    (sizeof(a) / sizeof(a[0]))
  818         static const struct {
  819                 u_int   m;      /* rate + mode */
  820                 u_int   r;      /* if_media rate */
  821         } rates[] = {
  822                 {   2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
  823                 {   4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
  824                 {   2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
  825                 {   4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
  826                 {  11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
  827                 {  22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
  828                 {  44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
  829                 {  12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
  830                 {  18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
  831                 {  24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
  832                 {  36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
  833                 {  48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
  834                 {  72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
  835                 {  96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
  836                 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
  837                 {   2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
  838                 {   4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
  839                 {  11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
  840                 {  22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
  841                 {  12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
  842                 {  18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
  843                 {  24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
  844                 {  36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
  845                 {  48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
  846                 {  72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
  847                 {  96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
  848                 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
  849                 /* NB: OFDM72 doesn't realy exist so we don't handle it */
  850         };
  851         u_int mask, i;
  852 
  853         mask = rate & IEEE80211_RATE_VAL;
  854         switch (mode) {
  855         case IEEE80211_MODE_11A:
  856         case IEEE80211_MODE_TURBO:
  857                 mask |= IFM_IEEE80211_11A;
  858                 break;
  859         case IEEE80211_MODE_11B:
  860                 mask |= IFM_IEEE80211_11B;
  861                 break;
  862         case IEEE80211_MODE_FH:
  863                 mask |= IFM_IEEE80211_FH;
  864                 break;
  865         case IEEE80211_MODE_11G:
  866                 mask |= IFM_IEEE80211_11G;
  867                 break;
  868         case IEEE80211_MODE_AUTO:
  869                 switch (ic->ic_phytype) {
  870                 case IEEE80211_T_FH:
  871                         mask |= IFM_IEEE80211_FH;
  872                         break;
  873                 case IEEE80211_T_DS:
  874                         mask |= IFM_IEEE80211_11B;
  875                         break;
  876                 case IEEE80211_T_OFDM:
  877                 case IEEE80211_T_TURBO:
  878                         mask |= IFM_IEEE80211_11G;
  879                         break;
  880                 }
  881         }
  882         for (i = 0; i < N(rates); i++)
  883                 if (rates[i].m == mask)
  884                         return rates[i].r;
  885         return IFM_AUTO;
  886 #undef N
  887 }
  888 
  889 int
  890 ieee80211_media2rate(int mword)
  891 {
  892 #define N(a)    (sizeof(a) / sizeof(a[0]))
  893         int i;
  894         static const struct {
  895                 int subtype;
  896                 int rate;
  897         } ieeerates[] = {
  898                 { IFM_AUTO,             -1      },
  899                 { IFM_MANUAL,           0       },
  900                 { IFM_NONE,             0       },
  901                 { IFM_IEEE80211_FH1,    2       },
  902                 { IFM_IEEE80211_FH2,    4       },
  903                 { IFM_IEEE80211_DS1,    2       },
  904                 { IFM_IEEE80211_DS2,    4       },
  905                 { IFM_IEEE80211_DS5,    11      },
  906                 { IFM_IEEE80211_DS11,   22      },
  907                 { IFM_IEEE80211_DS22,   44      },
  908                 { IFM_IEEE80211_OFDM6,  12      },
  909                 { IFM_IEEE80211_OFDM9,  18      },
  910                 { IFM_IEEE80211_OFDM12, 24      },
  911                 { IFM_IEEE80211_OFDM18, 36      },
  912                 { IFM_IEEE80211_OFDM24, 48      },
  913                 { IFM_IEEE80211_OFDM36, 72      },
  914                 { IFM_IEEE80211_OFDM48, 96      },
  915                 { IFM_IEEE80211_OFDM54, 108     },
  916                 { IFM_IEEE80211_OFDM72, 144     },
  917         };
  918         for (i = 0; i < N(ieeerates); i++) {
  919                 if (ieeerates[i].subtype == IFM_SUBTYPE(mword))
  920                         return ieeerates[i].rate;
  921         }
  922         return 0;
  923 #undef N
  924 }
  925 
  926 #ifdef __FreeBSD__
  927 /*
  928  * Module glue.
  929  *
  930  * NB: the module name is "wlan" for compatibility with NetBSD.
  931  */
  932 
  933 static int
  934 ieee80211_modevent(module_t mod, int type, void *unused)
  935 {
  936         switch (type) {
  937         case MOD_LOAD:
  938                 if (bootverbose)
  939                         printf("wlan: <802.11 Link Layer>\n");
  940                 return 0;
  941         case MOD_UNLOAD:
  942                 return 0;
  943         }
  944         return EINVAL;
  945 }
  946 
  947 static moduledata_t ieee80211_mod = {
  948         "wlan",
  949         ieee80211_modevent,
  950         0
  951 };
  952 DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
  953 MODULE_VERSION(wlan, 1);
  954 MODULE_DEPEND(wlan, rc4, 1, 1, 1);
  955 #endif

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