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.c

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    1 /*-
    2  * Copyright (c) 2001 Atsushi Onoe
    3  * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * Alternatively, this software may be distributed under the terms of the
   18  * GNU General Public License ("GPL") version 2 as published by the Free
   19  * Software Foundation.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 /*
   37  * IEEE 802.11 generic handler
   38  */
   39 
   40 #include "opt_inet.h"
   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/socket.h>
   49 #include <sys/sockio.h>
   50 #include <sys/endian.h>
   51 #include <sys/errno.h>
   52 #include <sys/bus.h>
   53 #include <sys/proc.h>
   54 #include <sys/sysctl.h>
   55 
   56 #include <machine/atomic.h>
   57  
   58 #include <net/if.h>
   59 #include <net/if_dl.h>
   60 #include <net/if_media.h>
   61 #include <net/if_arp.h>
   62 #include <net/ethernet.h>
   63 #include <net/if_llc.h>
   64 #include <net/route.h>
   65 
   66 #include <net80211/ieee80211_var.h>
   67 
   68 #include <net/bpf.h>
   69 
   70 #ifdef INET
   71 #include <netinet/in.h> 
   72 #include <netinet/if_ether.h>
   73 #endif
   74 
   75 #ifdef IEEE80211_DEBUG
   76 int     ieee80211_debug = 0;
   77 SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug,
   78             0, "IEEE 802.11 media debugging printfs");
   79 #endif
   80 
   81 static void ieee80211_set11gbasicrates(struct ieee80211_rateset *,
   82                 enum ieee80211_phymode);
   83 
   84 static const char *ieee80211_phymode_name[] = {
   85         "auto",         /* IEEE80211_MODE_AUTO */
   86         "11a",          /* IEEE80211_MODE_11A */
   87         "11b",          /* IEEE80211_MODE_11B */
   88         "11g",          /* IEEE80211_MODE_11G */
   89         "FH",           /* IEEE80211_MODE_FH */
   90         "turbo",        /* IEEE80211_MODE_TURBO */
   91 };
   92 
   93 void
   94 ieee80211_ifattach(struct ifnet *ifp)
   95 {
   96         struct ieee80211com *ic = (void *)ifp;
   97         struct ieee80211_channel *c;
   98         int i;
   99 
  100         ether_ifattach(ifp, ic->ic_myaddr);
  101         bpfattach2(ifp, DLT_IEEE802_11,
  102             sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf);
  103         ieee80211_crypto_attach(ifp);
  104 
  105         /*
  106          * Fill in 802.11 available channel set, mark
  107          * all available channels as active, and pick
  108          * a default channel if not already specified.
  109          */
  110         memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
  111         ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO;
  112         for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
  113                 c = &ic->ic_channels[i];
  114                 if (c->ic_flags) {
  115                         /*
  116                          * Verify driver passed us valid data.
  117                          */
  118                         if (i != ieee80211_chan2ieee(ic, c)) {
  119                                 if_printf(ifp, "bad channel ignored; "
  120                                         "freq %u flags %x number %u\n",
  121                                         c->ic_freq, c->ic_flags, i);
  122                                 c->ic_flags = 0;        /* NB: remove */
  123                                 continue;
  124                         }
  125                         setbit(ic->ic_chan_avail, i);
  126                         /*
  127                          * Identify mode capabilities.
  128                          */
  129                         if (IEEE80211_IS_CHAN_A(c))
  130                                 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A;
  131                         if (IEEE80211_IS_CHAN_B(c))
  132                                 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B;
  133                         if (IEEE80211_IS_CHAN_PUREG(c))
  134                                 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G;
  135                         if (IEEE80211_IS_CHAN_FHSS(c))
  136                                 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH;
  137                         if (IEEE80211_IS_CHAN_T(c))
  138                                 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO;
  139                 }
  140         }
  141         /* validate ic->ic_curmode */
  142         if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0)
  143                 ic->ic_curmode = IEEE80211_MODE_AUTO;
  144         ic->ic_des_chan = IEEE80211_CHAN_ANYC;  /* any channel is ok */
  145 
  146         (void) ieee80211_setmode(ic, ic->ic_curmode);
  147 
  148         if (ic->ic_lintval == 0)
  149                 ic->ic_lintval = 100;           /* default sleep */
  150         ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */
  151 
  152         ieee80211_node_attach(ifp);
  153         ieee80211_proto_attach(ifp);
  154 }
  155 
  156 void
  157 ieee80211_ifdetach(struct ifnet *ifp)
  158 {
  159         struct ieee80211com *ic = (void *)ifp;
  160 
  161         ieee80211_proto_detach(ifp);
  162         ieee80211_crypto_detach(ifp);
  163         ieee80211_node_detach(ifp);
  164         ifmedia_removeall(&ic->ic_media);
  165         bpfdetach(ifp);
  166         ether_ifdetach(ifp);
  167 }
  168 
  169 /*
  170  * Convert MHz frequency to IEEE channel number.
  171  */
  172 u_int
  173 ieee80211_mhz2ieee(u_int freq, u_int flags)
  174 {
  175         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  176                 if (freq == 2484)
  177                         return 14;
  178                 if (freq < 2484)
  179                         return (freq - 2407) / 5;
  180                 else
  181                         return 15 + ((freq - 2512) / 20);
  182         } else if (flags & IEEE80211_CHAN_5GHZ) {       /* 5Ghz band */
  183                 return (freq - 5000) / 5;
  184         } else {                                /* either, guess */
  185                 if (freq == 2484)
  186                         return 14;
  187                 if (freq < 2484)
  188                         return (freq - 2407) / 5;
  189                 if (freq < 5000)
  190                         return 15 + ((freq - 2512) / 20);
  191                 return (freq - 5000) / 5;
  192         }
  193 }
  194 
  195 /*
  196  * Convert channel to IEEE channel number.
  197  */
  198 u_int
  199 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c)
  200 {
  201         if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX])
  202                 return c - ic->ic_channels;
  203         else if (c == IEEE80211_CHAN_ANYC)
  204                 return IEEE80211_CHAN_ANY;
  205         else if (c != NULL) {
  206                 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n",
  207                         c->ic_freq, c->ic_flags);
  208                 return 0;               /* XXX */
  209         } else {
  210                 if_printf(&ic->ic_if, "invalid channel (NULL)\n");
  211                 return 0;               /* XXX */
  212         }
  213 }
  214 
  215 /*
  216  * Convert IEEE channel number to MHz frequency.
  217  */
  218 u_int
  219 ieee80211_ieee2mhz(u_int chan, u_int flags)
  220 {
  221         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  222                 if (chan == 14)
  223                         return 2484;
  224                 if (chan < 14)
  225                         return 2407 + chan*5;
  226                 else
  227                         return 2512 + ((chan-15)*20);
  228         } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
  229                 return 5000 + (chan*5);
  230         } else {                                /* either, guess */
  231                 if (chan == 14)
  232                         return 2484;
  233                 if (chan < 14)                  /* 0-13 */
  234                         return 2407 + chan*5;
  235                 if (chan < 27)                  /* 15-26 */
  236                         return 2512 + ((chan-15)*20);
  237                 return 5000 + (chan*5);
  238         }
  239 }
  240 
  241 /*
  242  * Setup the media data structures according to the channel and
  243  * rate tables.  This must be called by the driver after
  244  * ieee80211_attach and before most anything else.
  245  */
  246 void
  247 ieee80211_media_init(struct ifnet *ifp,
  248         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
  249 {
  250 #define ADD(_ic, _s, _o) \
  251         ifmedia_add(&(_ic)->ic_media, \
  252                 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
  253         struct ieee80211com *ic = (void *)ifp;
  254         struct ifmediareq imr;
  255         int i, j, mode, rate, maxrate, mword, mopt, r;
  256         struct ieee80211_rateset *rs;
  257         struct ieee80211_rateset allrates;
  258 
  259         /*
  260          * Do late attach work that must wait for any subclass
  261          * (i.e. driver) work such as overriding methods.
  262          */
  263         ieee80211_node_lateattach(ifp);
  264 
  265         /*
  266          * Fill in media characteristics.
  267          */
  268         ifmedia_init(&ic->ic_media, 0, media_change, media_stat);
  269         maxrate = 0;
  270         memset(&allrates, 0, sizeof(allrates));
  271         for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) {
  272                 static const u_int mopts[] = { 
  273                         IFM_AUTO,
  274                         IFM_IEEE80211_11A,
  275                         IFM_IEEE80211_11B,
  276                         IFM_IEEE80211_11G,
  277                         IFM_IEEE80211_FH,
  278                         IFM_IEEE80211_11A | IFM_IEEE80211_TURBO,
  279                 };
  280                 if ((ic->ic_modecaps & (1<<mode)) == 0)
  281                         continue;
  282                 mopt = mopts[mode];
  283                 ADD(ic, IFM_AUTO, mopt);        /* e.g. 11a auto */
  284                 if (ic->ic_caps & IEEE80211_C_IBSS)
  285                         ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC);
  286                 if (ic->ic_caps & IEEE80211_C_HOSTAP)
  287                         ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP);
  288                 if (ic->ic_caps & IEEE80211_C_AHDEMO)
  289                         ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
  290                 if (ic->ic_caps & IEEE80211_C_MONITOR)
  291                         ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR);
  292                 if (mode == IEEE80211_MODE_AUTO)
  293                         continue;
  294                 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
  295                 rs = &ic->ic_sup_rates[mode];
  296                 for (i = 0; i < rs->rs_nrates; i++) {
  297                         rate = rs->rs_rates[i];
  298                         mword = ieee80211_rate2media(ic, rate, mode);
  299                         if (mword == 0)
  300                                 continue;
  301                         printf("%s%d%sMbps", (i != 0 ? " " : ""),
  302                             (rate & IEEE80211_RATE_VAL) / 2,
  303                             ((rate & 0x1) != 0 ? ".5" : ""));
  304                         ADD(ic, mword, mopt);
  305                         if (ic->ic_caps & IEEE80211_C_IBSS)
  306                                 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC);
  307                         if (ic->ic_caps & IEEE80211_C_HOSTAP)
  308                                 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP);
  309                         if (ic->ic_caps & IEEE80211_C_AHDEMO)
  310                                 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
  311                         if (ic->ic_caps & IEEE80211_C_MONITOR)
  312                                 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR);
  313                         /*
  314                          * Add rate to the collection of all rates.
  315                          */
  316                         r = rate & IEEE80211_RATE_VAL;
  317                         for (j = 0; j < allrates.rs_nrates; j++)
  318                                 if (allrates.rs_rates[j] == r)
  319                                         break;
  320                         if (j == allrates.rs_nrates) {
  321                                 /* unique, add to the set */
  322                                 allrates.rs_rates[j] = r;
  323                                 allrates.rs_nrates++;
  324                         }
  325                         rate = (rate & IEEE80211_RATE_VAL) / 2;
  326                         if (rate > maxrate)
  327                                 maxrate = rate;
  328                 }
  329                 printf("\n");
  330         }
  331         for (i = 0; i < allrates.rs_nrates; i++) {
  332                 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
  333                                 IEEE80211_MODE_AUTO);
  334                 if (mword == 0)
  335                         continue;
  336                 mword = IFM_SUBTYPE(mword);     /* remove media options */
  337                 ADD(ic, mword, 0);
  338                 if (ic->ic_caps & IEEE80211_C_IBSS)
  339                         ADD(ic, mword, IFM_IEEE80211_ADHOC);
  340                 if (ic->ic_caps & IEEE80211_C_HOSTAP)
  341                         ADD(ic, mword, IFM_IEEE80211_HOSTAP);
  342                 if (ic->ic_caps & IEEE80211_C_AHDEMO)
  343                         ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0);
  344                 if (ic->ic_caps & IEEE80211_C_MONITOR)
  345                         ADD(ic, mword, IFM_IEEE80211_MONITOR);
  346         }
  347         ieee80211_media_status(ifp, &imr);
  348         ifmedia_set(&ic->ic_media, imr.ifm_active);
  349 
  350         if (maxrate)
  351                 ifp->if_baudrate = IF_Mbps(maxrate);
  352 #undef ADD
  353 }
  354 
  355 static int
  356 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate)
  357 {
  358 #define IEEERATE(_ic,_m,_i) \
  359         ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL)
  360         int i, nrates = ic->ic_sup_rates[mode].rs_nrates;
  361         for (i = 0; i < nrates; i++)
  362                 if (IEEERATE(ic, mode, i) == rate)
  363                         return i;
  364         return -1;
  365 #undef IEEERATE
  366 }
  367 
  368 /*
  369  * Handle a media change request.
  370  */
  371 int
  372 ieee80211_media_change(struct ifnet *ifp)
  373 {
  374         struct ieee80211com *ic = (void *)ifp;
  375         struct ifmedia_entry *ime;
  376         enum ieee80211_opmode newopmode;
  377         enum ieee80211_phymode newphymode;
  378         int i, j, newrate, error = 0;
  379 
  380         ime = ic->ic_media.ifm_cur;
  381         /*
  382          * First, identify the phy mode.
  383          */
  384         switch (IFM_MODE(ime->ifm_media)) {
  385         case IFM_IEEE80211_11A:
  386                 newphymode = IEEE80211_MODE_11A;
  387                 break;
  388         case IFM_IEEE80211_11B:
  389                 newphymode = IEEE80211_MODE_11B;
  390                 break;
  391         case IFM_IEEE80211_11G:
  392                 newphymode = IEEE80211_MODE_11G;
  393                 break;
  394         case IFM_IEEE80211_FH:
  395                 newphymode = IEEE80211_MODE_FH;
  396                 break;
  397         case IFM_AUTO:
  398                 newphymode = IEEE80211_MODE_AUTO;
  399                 break;
  400         default:
  401                 return EINVAL;
  402         }
  403         /*
  404          * Turbo mode is an ``option''.  Eventually it
  405          * needs to be applied to 11g too.
  406          */
  407         if (ime->ifm_media & IFM_IEEE80211_TURBO) {
  408                 if (newphymode != IEEE80211_MODE_11A)
  409                         return EINVAL;
  410                 newphymode = IEEE80211_MODE_TURBO;
  411         }
  412         /*
  413          * Validate requested mode is available.
  414          */
  415         if ((ic->ic_modecaps & (1<<newphymode)) == 0)
  416                 return EINVAL;
  417 
  418         /*
  419          * Next, the fixed/variable rate.
  420          */
  421         i = -1;
  422         if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) {
  423                 /*
  424                  * Convert media subtype to rate.
  425                  */
  426                 newrate = ieee80211_media2rate(ime->ifm_media);
  427                 if (newrate == 0)
  428                         return EINVAL;
  429                 /*
  430                  * Check the rate table for the specified/current phy.
  431                  */
  432                 if (newphymode == IEEE80211_MODE_AUTO) {
  433                         /*
  434                          * In autoselect mode search for the rate.
  435                          */
  436                         for (j = IEEE80211_MODE_11A;
  437                              j < IEEE80211_MODE_MAX; j++) {
  438                                 if ((ic->ic_modecaps & (1<<j)) == 0)
  439                                         continue;
  440                                 i = findrate(ic, j, newrate);
  441                                 if (i != -1) {
  442                                         /* lock mode too */
  443                                         newphymode = j;
  444                                         break;
  445                                 }
  446                         }
  447                 } else {
  448                         i = findrate(ic, newphymode, newrate);
  449                 }
  450                 if (i == -1)                    /* mode/rate mismatch */
  451                         return EINVAL;
  452         }
  453         /* NB: defer rate setting to later */
  454 
  455         /*
  456          * Deduce new operating mode but don't install it just yet.
  457          */
  458         if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) ==
  459             (IFM_IEEE80211_ADHOC|IFM_FLAG0))
  460                 newopmode = IEEE80211_M_AHDEMO;
  461         else if (ime->ifm_media & IFM_IEEE80211_HOSTAP)
  462                 newopmode = IEEE80211_M_HOSTAP;
  463         else if (ime->ifm_media & IFM_IEEE80211_ADHOC)
  464                 newopmode = IEEE80211_M_IBSS;
  465         else if (ime->ifm_media & IFM_IEEE80211_MONITOR)
  466                 newopmode = IEEE80211_M_MONITOR;
  467         else
  468                 newopmode = IEEE80211_M_STA;
  469 
  470         /*
  471          * Autoselect doesn't make sense when operating as an AP.
  472          * If no phy mode has been selected, pick one and lock it
  473          * down so rate tables can be used in forming beacon frames
  474          * and the like.
  475          */
  476         if (newopmode == IEEE80211_M_HOSTAP &&
  477             newphymode == IEEE80211_MODE_AUTO) {
  478                 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++)
  479                         if (ic->ic_modecaps & (1<<j)) {
  480                                 newphymode = j;
  481                                 break;
  482                         }
  483         }
  484 
  485         /*
  486          * Handle phy mode change.
  487          */
  488         if (ic->ic_curmode != newphymode) {             /* change phy mode */
  489                 error = ieee80211_setmode(ic, newphymode);
  490                 if (error != 0)
  491                         return error;
  492                 error = ENETRESET;
  493         }
  494 
  495         /*
  496          * Committed to changes, install the rate setting.
  497          */
  498         if (ic->ic_fixed_rate != i) {
  499                 ic->ic_fixed_rate = i;                  /* set fixed tx rate */
  500                 error = ENETRESET;
  501         }
  502 
  503         /*
  504          * Handle operating mode change.
  505          */
  506         if (ic->ic_opmode != newopmode) {
  507                 ic->ic_opmode = newopmode;
  508                 switch (newopmode) {
  509                 case IEEE80211_M_AHDEMO:
  510                 case IEEE80211_M_HOSTAP:
  511                 case IEEE80211_M_STA:
  512                 case IEEE80211_M_MONITOR:
  513                         ic->ic_flags &= ~IEEE80211_F_IBSSON;
  514                         break;
  515                 case IEEE80211_M_IBSS:
  516                         ic->ic_flags |= IEEE80211_F_IBSSON;
  517 #ifdef notdef
  518                         if (ic->ic_curmode == IEEE80211_MODE_11G)
  519                                 ieee80211_set11gbasicrates(
  520                                         &ic->ic_suprates[newphymode],
  521                                         IEEE80211_MODE_11B);
  522 #endif
  523                         break;
  524                 }
  525                 error = ENETRESET;
  526         }
  527 #ifdef notdef
  528         if (error == 0)
  529                 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media);
  530 #endif
  531         return error;
  532 }
  533 
  534 void
  535 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
  536 {
  537         struct ieee80211com *ic = (void *)ifp;
  538         struct ieee80211_node *ni = NULL;
  539         int old_status = imr->ifm_status;
  540 
  541         imr->ifm_status = IFM_AVALID;
  542         imr->ifm_active = IFM_IEEE80211;
  543         if (ic->ic_state == IEEE80211_S_RUN) {
  544                 imr->ifm_status |= IFM_ACTIVE;
  545                 ifp->if_link_state = LINK_STATE_UP;
  546         } else
  547                 ifp->if_link_state = LINK_STATE_DOWN;
  548         imr->ifm_active |= IFM_AUTO;
  549         switch (ic->ic_opmode) {
  550         case IEEE80211_M_STA:
  551                 ni = ic->ic_bss;
  552                 /* calculate rate subtype */
  553                 imr->ifm_active |= ieee80211_rate2media(ic,
  554                         ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode);
  555                 break;
  556         case IEEE80211_M_IBSS:
  557                 imr->ifm_active |= IFM_IEEE80211_ADHOC;
  558                 break;
  559         case IEEE80211_M_AHDEMO:
  560                 /* should not come here */
  561                 break;
  562         case IEEE80211_M_HOSTAP:
  563                 imr->ifm_active |= IFM_IEEE80211_HOSTAP;
  564                 break;
  565         case IEEE80211_M_MONITOR:
  566                 imr->ifm_active |= IFM_IEEE80211_MONITOR;
  567                 break;
  568         }
  569         switch (ic->ic_curmode) {
  570         case IEEE80211_MODE_11A:
  571                 imr->ifm_active |= IFM_IEEE80211_11A;
  572                 break;
  573         case IEEE80211_MODE_11B:
  574                 imr->ifm_active |= IFM_IEEE80211_11B;
  575                 break;
  576         case IEEE80211_MODE_11G:
  577                 imr->ifm_active |= IFM_IEEE80211_11G;
  578                 break;
  579         case IEEE80211_MODE_FH:
  580                 imr->ifm_active |= IFM_IEEE80211_FH;
  581                 break;
  582         case IEEE80211_MODE_TURBO:
  583                 imr->ifm_active |= IFM_IEEE80211_11A
  584                                 |  IFM_IEEE80211_TURBO;
  585                 break;
  586         }
  587 
  588         /* Notify that the link state has changed. */
  589         if (imr->ifm_status != old_status)
  590                 rt_ifmsg(ifp);
  591 }
  592 
  593 void
  594 ieee80211_watchdog(struct ifnet *ifp)
  595 {
  596         struct ieee80211com *ic = (void *)ifp;
  597 
  598         if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0)
  599                 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
  600         if (ic->ic_inact_timer && --ic->ic_inact_timer == 0)
  601                 ieee80211_timeout_nodes(ic);
  602 
  603         if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0)
  604                 ifp->if_timer = 1;
  605 }
  606 
  607 /*
  608  * Mark the basic rates for the 11g rate table based on the
  609  * operating mode.  For real 11g we mark all the 11b rates
  610  * and 6, 12, and 24 OFDM.  For 11b compatibility we mark only
  611  * 11b rates.  There's also a pseudo 11a-mode used to mark only
  612  * the basic OFDM rates.
  613  */
  614 static void
  615 ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode)
  616 {
  617         static const struct ieee80211_rateset basic[] = {
  618             { 3, { 12, 24, 48 } },              /* IEEE80211_MODE_11A */
  619             { 4, { 2, 4, 11, 22 } },            /* IEEE80211_MODE_11B */
  620             { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */
  621             { 0 },                              /* IEEE80211_MODE_FH */
  622             { 0 },                              /* IEEE80211_MODE_TURBO */
  623         };
  624         int i, j;
  625 
  626         for (i = 0; i < rs->rs_nrates; i++) {
  627                 rs->rs_rates[i] &= IEEE80211_RATE_VAL;
  628                 for (j = 0; j < basic[mode].rs_nrates; j++)
  629                         if (basic[mode].rs_rates[j] == rs->rs_rates[i]) {
  630                                 rs->rs_rates[i] |= IEEE80211_RATE_BASIC;
  631                                 break;
  632                         }
  633         }
  634 }
  635 
  636 /*
  637  * Set the current phy mode and recalculate the active channel
  638  * set based on the available channels for this mode.  Also
  639  * select a new default/current channel if the current one is
  640  * inappropriate for this mode.
  641  */
  642 int
  643 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
  644 {
  645 #define N(a)    (sizeof(a) / sizeof(a[0]))
  646         static const u_int chanflags[] = {
  647                 0,                      /* IEEE80211_MODE_AUTO */
  648                 IEEE80211_CHAN_A,       /* IEEE80211_MODE_11A */
  649                 IEEE80211_CHAN_B,       /* IEEE80211_MODE_11B */
  650                 IEEE80211_CHAN_PUREG,   /* IEEE80211_MODE_11G */
  651                 IEEE80211_CHAN_FHSS,    /* IEEE80211_MODE_FH */
  652                 IEEE80211_CHAN_T,       /* IEEE80211_MODE_TURBO */
  653         };
  654         struct ieee80211_channel *c;
  655         u_int modeflags;
  656         int i;
  657 
  658         /* validate new mode */
  659         if ((ic->ic_modecaps & (1<<mode)) == 0) {
  660                 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n",
  661                         __func__, mode, ic->ic_modecaps));
  662                 return EINVAL;
  663         }
  664 
  665         /*
  666          * Verify at least one channel is present in the available
  667          * channel list before committing to the new mode.
  668          */
  669         KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode));
  670         modeflags = chanflags[mode];
  671         for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
  672                 c = &ic->ic_channels[i];
  673                 if (mode == IEEE80211_MODE_AUTO) {
  674                         /* ignore turbo channels for autoselect */
  675                         if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
  676                                 break;
  677                 } else {
  678                         if ((c->ic_flags & modeflags) == modeflags)
  679                                 break;
  680                 }
  681         }
  682         if (i > IEEE80211_CHAN_MAX) {
  683                 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n",
  684                         __func__, mode));
  685                 return EINVAL;
  686         }
  687 
  688         /*
  689          * Calculate the active channel set.
  690          */
  691         memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active));
  692         for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
  693                 c = &ic->ic_channels[i];
  694                 if (mode == IEEE80211_MODE_AUTO) {
  695                         /* take anything but pure turbo channels */
  696                         if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
  697                                 setbit(ic->ic_chan_active, i);
  698                 } else {
  699                         if ((c->ic_flags & modeflags) == modeflags)
  700                                 setbit(ic->ic_chan_active, i);
  701                 }
  702         }
  703         /*
  704          * If no current/default channel is setup or the current
  705          * channel is wrong for the mode then pick the first
  706          * available channel from the active list.  This is likely
  707          * not the right one.
  708          */
  709         if (ic->ic_ibss_chan == NULL ||
  710             isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) {
  711                 for (i = 0; i <= IEEE80211_CHAN_MAX; i++)
  712                         if (isset(ic->ic_chan_active, i)) {
  713                                 ic->ic_ibss_chan = &ic->ic_channels[i];
  714                                 break;
  715                         }
  716         }
  717 
  718         /*
  719          * Set/reset state flags that influence beacon contents, etc.
  720          *
  721          * XXX what if we have stations already associated???
  722          * XXX probably not right for autoselect?
  723          */
  724         if (ic->ic_caps & IEEE80211_C_SHPREAMBLE)
  725                 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
  726         if (mode == IEEE80211_MODE_11G) {
  727                 if (ic->ic_caps & IEEE80211_C_SHSLOT)
  728                         ic->ic_flags |= IEEE80211_F_SHSLOT;
  729                 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode],
  730                         IEEE80211_MODE_11G);
  731         } else {
  732                 ic->ic_flags &= ~IEEE80211_F_SHSLOT;
  733         }
  734 
  735         ic->ic_curmode = mode;
  736         return 0;
  737 #undef N
  738 }
  739 
  740 /*
  741  * Return the phy mode for with the specified channel so the
  742  * caller can select a rate set.  This is problematic and the
  743  * work here assumes how things work elsewhere in this code.
  744  */
  745 enum ieee80211_phymode
  746 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan)
  747 {
  748         /*
  749          * NB: this assumes the channel would not be supplied to us
  750          *     unless it was already compatible with the current mode.
  751          */
  752         if (ic->ic_curmode != IEEE80211_MODE_AUTO)
  753                 return ic->ic_curmode;
  754         /*
  755          * In autoselect mode; deduce a mode based on the channel
  756          * characteristics.  We assume that turbo-only channels
  757          * are not considered when the channel set is constructed.
  758          */
  759         if (IEEE80211_IS_CHAN_5GHZ(chan))
  760                 return IEEE80211_MODE_11A;
  761         else if (IEEE80211_IS_CHAN_FHSS(chan))
  762                 return IEEE80211_MODE_FH;
  763         else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN))
  764                 return IEEE80211_MODE_11G;
  765         else
  766                 return IEEE80211_MODE_11B;
  767 }
  768 
  769 /*
  770  * convert IEEE80211 rate value to ifmedia subtype.
  771  * ieee80211 rate is in unit of 0.5Mbps.
  772  */
  773 int
  774 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
  775 {
  776 #define N(a)    (sizeof(a) / sizeof(a[0]))
  777         static const struct {
  778                 u_int   m;      /* rate + mode */
  779                 u_int   r;      /* if_media rate */
  780         } rates[] = {
  781                 {   2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
  782                 {   4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
  783                 {   2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
  784                 {   4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
  785                 {  11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
  786                 {  22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
  787                 {  44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
  788                 {  12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
  789                 {  18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
  790                 {  24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
  791                 {  36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
  792                 {  48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
  793                 {  72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
  794                 {  96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
  795                 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
  796                 {   2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
  797                 {   4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
  798                 {  11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
  799                 {  22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
  800                 {  12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
  801                 {  18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
  802                 {  24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
  803                 {  36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
  804                 {  48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
  805                 {  72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
  806                 {  96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
  807                 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
  808                 /* NB: OFDM72 doesn't realy exist so we don't handle it */
  809         };
  810         u_int mask, i;
  811 
  812         mask = rate & IEEE80211_RATE_VAL;
  813         switch (mode) {
  814         case IEEE80211_MODE_11A:
  815         case IEEE80211_MODE_TURBO:
  816                 mask |= IFM_IEEE80211_11A;
  817                 break;
  818         case IEEE80211_MODE_11B:
  819                 mask |= IFM_IEEE80211_11B;
  820                 break;
  821         case IEEE80211_MODE_FH:
  822                 mask |= IFM_IEEE80211_FH;
  823                 break;
  824         case IEEE80211_MODE_AUTO:
  825                 /* NB: ic may be NULL for some drivers */
  826                 if (ic && ic->ic_phytype == IEEE80211_T_FH) {
  827                         mask |= IFM_IEEE80211_FH;
  828                         break;
  829                 }
  830                 /* NB: hack, 11g matches both 11b+11a rates */
  831                 /* fall thru... */
  832         case IEEE80211_MODE_11G:
  833                 mask |= IFM_IEEE80211_11G;
  834                 break;
  835         }
  836         for (i = 0; i < N(rates); i++)
  837                 if (rates[i].m == mask)
  838                         return rates[i].r;
  839         return IFM_AUTO;
  840 #undef N
  841 }
  842 
  843 int
  844 ieee80211_media2rate(int mword)
  845 {
  846 #define N(a)    (sizeof(a) / sizeof(a[0]))
  847         static const int ieeerates[] = {
  848                 -1,             /* IFM_AUTO */
  849                 0,              /* IFM_MANUAL */
  850                 0,              /* IFM_NONE */
  851                 2,              /* IFM_IEEE80211_FH1 */
  852                 4,              /* IFM_IEEE80211_FH2 */
  853                 2,              /* IFM_IEEE80211_DS1 */
  854                 4,              /* IFM_IEEE80211_DS2 */
  855                 11,             /* IFM_IEEE80211_DS5 */
  856                 22,             /* IFM_IEEE80211_DS11 */
  857                 44,             /* IFM_IEEE80211_DS22 */
  858                 12,             /* IFM_IEEE80211_OFDM6 */
  859                 18,             /* IFM_IEEE80211_OFDM9 */
  860                 24,             /* IFM_IEEE80211_OFDM12 */
  861                 36,             /* IFM_IEEE80211_OFDM18 */
  862                 48,             /* IFM_IEEE80211_OFDM24 */
  863                 72,             /* IFM_IEEE80211_OFDM36 */
  864                 96,             /* IFM_IEEE80211_OFDM48 */
  865                 108,            /* IFM_IEEE80211_OFDM54 */
  866                 144,            /* IFM_IEEE80211_OFDM72 */
  867         };
  868         return IFM_SUBTYPE(mword) < N(ieeerates) ?
  869                 ieeerates[IFM_SUBTYPE(mword)] : 0;
  870 #undef N
  871 }
  872 
  873 /*
  874  * Module glue.
  875  *
  876  * NB: the module name is "wlan" for compatibility with NetBSD.
  877  */
  878 
  879 static int
  880 ieee80211_modevent(module_t mod, int type, void *unused)
  881 {
  882         switch (type) {
  883         case MOD_LOAD:
  884                 if (bootverbose)
  885                         printf("wlan: <802.11 Link Layer>\n");
  886                 return 0;
  887         case MOD_UNLOAD:
  888                 return 0;
  889         }
  890         return EINVAL;
  891 }
  892 
  893 static moduledata_t ieee80211_mod = {
  894         "wlan",
  895         ieee80211_modevent,
  896         0
  897 };
  898 DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
  899 MODULE_VERSION(wlan, 1);
  900 MODULE_DEPEND(wlan, rc4, 1, 1, 1);
  901 MODULE_DEPEND(wlan, ether, 1, 1, 1);

Cache object: 221de8d6e87fa8b5ef8919d38c952ca7


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