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_regdomain.c

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    1 /*-
    2  * Copyright (c) 2005-2008 Sam Leffler, Errno Consulting
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/10.2/sys/net80211/ieee80211_regdomain.c 233845 2012-04-03 17:48:42Z bschmidt $");
   28 
   29 /*
   30  * IEEE 802.11 regdomain support.
   31  */
   32 #include "opt_wlan.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h> 
   36 #include <sys/kernel.h>
   37  
   38 #include <sys/socket.h>
   39 
   40 #include <net/if.h>
   41 #include <net/if_media.h>
   42 
   43 #include <net80211/ieee80211_var.h>
   44 #include <net80211/ieee80211_regdomain.h>
   45 
   46 static void
   47 null_getradiocaps(struct ieee80211com *ic, int maxchan,
   48         int *n, struct ieee80211_channel *c)
   49 {
   50         /* just feed back the current channel list */
   51         if (maxchan > ic->ic_nchans)
   52                 maxchan = ic->ic_nchans;
   53         memcpy(c, ic->ic_channels, maxchan*sizeof(struct ieee80211_channel));
   54         *n = maxchan;
   55 }
   56 
   57 static int
   58 null_setregdomain(struct ieee80211com *ic,
   59         struct ieee80211_regdomain *rd,
   60         int nchans, struct ieee80211_channel chans[])
   61 {
   62         return 0;               /* accept anything */
   63 }
   64 
   65 void
   66 ieee80211_regdomain_attach(struct ieee80211com *ic)
   67 {
   68         if (ic->ic_regdomain.regdomain == 0 &&
   69             ic->ic_regdomain.country == CTRY_DEFAULT) {
   70                 ic->ic_regdomain.country = CTRY_UNITED_STATES;  /* XXX */
   71                 ic->ic_regdomain.location = ' ';                /* both */
   72                 ic->ic_regdomain.isocc[0] = 'U';                /* XXX */
   73                 ic->ic_regdomain.isocc[1] = 'S';                /* XXX */
   74                 /* NB: driver calls ieee80211_init_channels or similar */
   75         }
   76         ic->ic_getradiocaps = null_getradiocaps;
   77         ic->ic_setregdomain = null_setregdomain;
   78 }
   79 
   80 void
   81 ieee80211_regdomain_detach(struct ieee80211com *ic)
   82 {
   83         if (ic->ic_countryie != NULL) {
   84                 free(ic->ic_countryie, M_80211_NODE_IE);
   85                 ic->ic_countryie = NULL;
   86         }
   87 }
   88 
   89 void
   90 ieee80211_regdomain_vattach(struct ieee80211vap *vap)
   91 {
   92 }
   93 
   94 void
   95 ieee80211_regdomain_vdetach(struct ieee80211vap *vap)
   96 {
   97 }
   98 
   99 static void
  100 addchan(struct ieee80211com *ic, int ieee, int flags)
  101 {
  102         struct ieee80211_channel *c;
  103 
  104         c = &ic->ic_channels[ic->ic_nchans++];
  105         c->ic_freq = ieee80211_ieee2mhz(ieee, flags);
  106         c->ic_ieee = ieee;
  107         c->ic_flags = flags;
  108         if (flags & IEEE80211_CHAN_HT40U)
  109                 c->ic_extieee = ieee + 4;
  110         else if (flags & IEEE80211_CHAN_HT40D)
  111                 c->ic_extieee = ieee - 4;
  112         else
  113                 c->ic_extieee = 0;
  114 }
  115 
  116 /*
  117  * Setup the channel list for the specified regulatory domain,
  118  * country code, and operating modes.  This interface is used
  119  * when a driver does not obtain the channel list from another
  120  * source (such as firmware).
  121  */
  122 int
  123 ieee80211_init_channels(struct ieee80211com *ic,
  124         const struct ieee80211_regdomain *rd, const uint8_t bands[])
  125 {
  126         int i;
  127 
  128         /* XXX just do something for now */
  129         ic->ic_nchans = 0;
  130         if (isset(bands, IEEE80211_MODE_11B) ||
  131             isset(bands, IEEE80211_MODE_11G) ||
  132             isset(bands, IEEE80211_MODE_11NG)) {
  133                 int maxchan = 11;
  134                 if (rd != NULL && rd->ecm)
  135                         maxchan = 14;
  136                 for (i = 1; i <= maxchan; i++) {
  137                         if (isset(bands, IEEE80211_MODE_11B))
  138                                 addchan(ic, i, IEEE80211_CHAN_B);
  139                         if (isset(bands, IEEE80211_MODE_11G))
  140                                 addchan(ic, i, IEEE80211_CHAN_G);
  141                         if (isset(bands, IEEE80211_MODE_11NG)) {
  142                                 addchan(ic, i,
  143                                     IEEE80211_CHAN_G | IEEE80211_CHAN_HT20);
  144                         }
  145                         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) == 0)
  146                                 continue;
  147                         if (i <= 7) {
  148                                 addchan(ic, i,
  149                                     IEEE80211_CHAN_G | IEEE80211_CHAN_HT40U);
  150                                 addchan(ic, i + 4,
  151                                     IEEE80211_CHAN_G | IEEE80211_CHAN_HT40D);
  152                         }
  153                 }
  154         }
  155         if (isset(bands, IEEE80211_MODE_11A) ||
  156             isset(bands, IEEE80211_MODE_11NA)) {
  157                 for (i = 36; i <= 64; i += 4) {
  158                         addchan(ic, i, IEEE80211_CHAN_A);
  159                         if (isset(bands, IEEE80211_MODE_11NA)) {
  160                                 addchan(ic, i,
  161                                     IEEE80211_CHAN_A | IEEE80211_CHAN_HT20);
  162                         }
  163                         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) == 0)
  164                                 continue;
  165                         if ((i % 8) == 4) {
  166                                 addchan(ic, i,
  167                                     IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U);
  168                                 addchan(ic, i + 4,
  169                                     IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D);
  170                         }
  171                 }
  172                 for (i = 100; i <= 140; i += 4) {
  173                         addchan(ic, i, IEEE80211_CHAN_A);
  174                         if (isset(bands, IEEE80211_MODE_11NA)) {
  175                                 addchan(ic, i,
  176                                     IEEE80211_CHAN_A | IEEE80211_CHAN_HT20);
  177                         }
  178                         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) == 0)
  179                                 continue;
  180                         if ((i % 8) == 4 && i != 140) {
  181                                 addchan(ic, i,
  182                                     IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U);
  183                                 addchan(ic, i + 4,
  184                                     IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D);
  185                         }
  186                 }
  187                 for (i = 149; i <= 161; i += 4) {
  188                         addchan(ic, i, IEEE80211_CHAN_A);
  189                         if (isset(bands, IEEE80211_MODE_11NA)) {
  190                                 addchan(ic, i,
  191                                     IEEE80211_CHAN_A | IEEE80211_CHAN_HT20);
  192                         }
  193                         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) == 0)
  194                                 continue;
  195                         if ((i % 8) == 5) {
  196                                 addchan(ic, i,
  197                                     IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U);
  198                                 addchan(ic, i + 4,
  199                                     IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D);
  200                         }
  201                 }
  202         }
  203         if (rd != NULL)
  204                 ic->ic_regdomain = *rd;
  205 
  206         return 0;
  207 }
  208 
  209 static __inline int
  210 chancompar(const void *a, const void *b)
  211 {
  212         const struct ieee80211_channel *ca = a;
  213         const struct ieee80211_channel *cb = b;
  214 
  215         return (ca->ic_freq == cb->ic_freq) ?
  216                 (ca->ic_flags & IEEE80211_CHAN_ALL) -
  217                     (cb->ic_flags & IEEE80211_CHAN_ALL) :
  218                 ca->ic_freq - cb->ic_freq;
  219 }
  220 
  221 /*
  222  * Insertion sort.
  223  */
  224 #define swap(_a, _b, _size) {                   \
  225         uint8_t *s = _b;                        \
  226         int i = _size;                          \
  227         do {                                    \
  228                 uint8_t tmp = *_a;              \
  229                 *_a++ = *s;                     \
  230                 *s++ = tmp;                     \
  231         } while (--i);                          \
  232         _a -= _size;                            \
  233 }
  234 
  235 static void
  236 sort_channels(void *a, size_t n, size_t size)
  237 {
  238         uint8_t *aa = a;
  239         uint8_t *ai, *t;
  240 
  241         KASSERT(n > 0, ("no channels"));
  242         for (ai = aa+size; --n >= 1; ai += size)
  243                 for (t = ai; t > aa; t -= size) {
  244                         uint8_t *u = t - size;
  245                         if (chancompar(u, t) <= 0)
  246                                 break;
  247                         swap(u, t, size);
  248                 }
  249 }
  250 #undef swap
  251 
  252 /*
  253  * Order channels w/ the same frequency so that
  254  * b < g < htg and a < hta.  This is used to optimize
  255  * channel table lookups and some user applications
  256  * may also depend on it (though they should not).
  257  */
  258 void
  259 ieee80211_sort_channels(struct ieee80211_channel chans[], int nchans)
  260 {
  261         if (nchans > 0)
  262                 sort_channels(chans, nchans, sizeof(struct ieee80211_channel));
  263 }
  264 
  265 /*
  266  * Allocate and construct a Country Information IE.
  267  */
  268 struct ieee80211_appie *
  269 ieee80211_alloc_countryie(struct ieee80211com *ic)
  270 {
  271 #define CHAN_UNINTERESTING \
  272     (IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO | \
  273      IEEE80211_CHAN_HALF | IEEE80211_CHAN_QUARTER)
  274         /* XXX what about auto? */
  275         /* flag set of channels to be excluded (band added below) */
  276         static const int skipflags[IEEE80211_MODE_MAX] = {
  277             [IEEE80211_MODE_AUTO]       = CHAN_UNINTERESTING,
  278             [IEEE80211_MODE_11A]        = CHAN_UNINTERESTING,
  279             [IEEE80211_MODE_11B]        = CHAN_UNINTERESTING,
  280             [IEEE80211_MODE_11G]        = CHAN_UNINTERESTING,
  281             [IEEE80211_MODE_FH]         = CHAN_UNINTERESTING
  282                                         | IEEE80211_CHAN_OFDM
  283                                         | IEEE80211_CHAN_CCK
  284                                         | IEEE80211_CHAN_DYN,
  285             [IEEE80211_MODE_TURBO_A]    = CHAN_UNINTERESTING,
  286             [IEEE80211_MODE_TURBO_G]    = CHAN_UNINTERESTING,
  287             [IEEE80211_MODE_STURBO_A]   = CHAN_UNINTERESTING,
  288             [IEEE80211_MODE_HALF]       = IEEE80211_CHAN_TURBO
  289                                         | IEEE80211_CHAN_STURBO,
  290             [IEEE80211_MODE_QUARTER]    = IEEE80211_CHAN_TURBO
  291                                         | IEEE80211_CHAN_STURBO,
  292             [IEEE80211_MODE_11NA]       = CHAN_UNINTERESTING,
  293             [IEEE80211_MODE_11NG]       = CHAN_UNINTERESTING,
  294         };
  295         const struct ieee80211_regdomain *rd = &ic->ic_regdomain;
  296         uint8_t nextchan, chans[IEEE80211_CHAN_BYTES], *frm;
  297         struct ieee80211_appie *aie;
  298         struct ieee80211_country_ie *ie;
  299         int i, skip, nruns;
  300 
  301         aie = malloc(IEEE80211_COUNTRY_MAX_SIZE, M_80211_NODE_IE,
  302             M_NOWAIT | M_ZERO);
  303         if (aie == NULL) {
  304                 if_printf(ic->ic_ifp,
  305                     "%s: unable to allocate memory for country ie\n", __func__);
  306                 /* XXX stat */
  307                 return NULL;
  308         }
  309         ie = (struct ieee80211_country_ie *) aie->ie_data;
  310         ie->ie = IEEE80211_ELEMID_COUNTRY;
  311         if (rd->isocc[0] == '\0') {
  312                 if_printf(ic->ic_ifp, "no ISO country string for cc %d; "
  313                         "using blanks\n", rd->country);
  314                 ie->cc[0] = ie->cc[1] = ' ';
  315         } else {
  316                 ie->cc[0] = rd->isocc[0];
  317                 ie->cc[1] = rd->isocc[1];
  318         }
  319         /* 
  320          * Indoor/Outdoor portion of country string:
  321          *     'I' indoor only
  322          *     'O' outdoor only
  323          *     ' ' all enviroments
  324          */
  325         ie->cc[2] = (rd->location == 'I' ? 'I' :
  326                      rd->location == 'O' ? 'O' : ' ');
  327         /* 
  328          * Run-length encoded channel+max tx power info.
  329          */
  330         frm = (uint8_t *)&ie->band[0];
  331         nextchan = 0;                   /* NB: impossible channel # */
  332         nruns = 0;
  333         memset(chans, 0, sizeof(chans));
  334         skip = skipflags[ieee80211_chan2mode(ic->ic_bsschan)];
  335         if (IEEE80211_IS_CHAN_5GHZ(ic->ic_bsschan))
  336                 skip |= IEEE80211_CHAN_2GHZ;
  337         else if (IEEE80211_IS_CHAN_2GHZ(ic->ic_bsschan))
  338                 skip |= IEEE80211_CHAN_5GHZ;
  339         for (i = 0; i < ic->ic_nchans; i++) {
  340                 const struct ieee80211_channel *c = &ic->ic_channels[i];
  341 
  342                 if (isset(chans, c->ic_ieee))           /* suppress dup's */
  343                         continue;
  344                 if (c->ic_flags & skip)                 /* skip band, etc. */
  345                         continue;
  346                 setbit(chans, c->ic_ieee);
  347                 if (c->ic_ieee != nextchan ||
  348                     c->ic_maxregpower != frm[-1]) {     /* new run */
  349                         if (nruns == IEEE80211_COUNTRY_MAX_BANDS) {
  350                                 if_printf(ic->ic_ifp, "%s: country ie too big, "
  351                                     "runs > max %d, truncating\n",
  352                                     __func__, IEEE80211_COUNTRY_MAX_BANDS);
  353                                 /* XXX stat? fail? */
  354                                 break;
  355                         }
  356                         frm[0] = c->ic_ieee;            /* starting channel # */
  357                         frm[1] = 1;                     /* # channels in run */
  358                         frm[2] = c->ic_maxregpower;     /* tx power cap */
  359                         frm += 3;
  360                         nextchan = c->ic_ieee + 1;      /* overflow? */
  361                         nruns++;
  362                 } else {                                /* extend run */
  363                         frm[-2]++;
  364                         nextchan++;
  365                 }
  366         }
  367         ie->len = frm - ie->cc;
  368         if (ie->len & 1) {              /* Zero pad to multiple of 2 */
  369                 ie->len++;
  370                 *frm++ = 0;
  371         }
  372         aie->ie_len = frm - aie->ie_data;
  373 
  374         return aie;
  375 #undef CHAN_UNINTERESTING
  376 }
  377 
  378 static int
  379 allvapsdown(struct ieee80211com *ic)
  380 {
  381         struct ieee80211vap *vap;
  382 
  383         IEEE80211_LOCK_ASSERT(ic);
  384         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  385                 if (vap->iv_state != IEEE80211_S_INIT)
  386                         return 0;
  387         return 1;
  388 }
  389 
  390 int
  391 ieee80211_setregdomain(struct ieee80211vap *vap,
  392     struct ieee80211_regdomain_req *reg)
  393 {
  394         struct ieee80211com *ic = vap->iv_ic;
  395         struct ieee80211_channel *c;
  396         int desfreq = 0, desflags = 0;          /* XXX silence gcc complaint */
  397         int error, i;
  398 
  399         if (reg->rd.location != 'I' && reg->rd.location != 'O' &&
  400             reg->rd.location != ' ') {
  401                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  402                     "%s: invalid location 0x%x\n", __func__, reg->rd.location);
  403                 return EINVAL;
  404         }
  405         if (reg->rd.isocc[0] == '\0' || reg->rd.isocc[1] == '\0') {
  406                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  407                     "%s: invalid iso cc 0x%x:0x%x\n", __func__,
  408                     reg->rd.isocc[0], reg->rd.isocc[1]);
  409                 return EINVAL;
  410         }
  411         if (reg->chaninfo.ic_nchans > IEEE80211_CHAN_MAX) {
  412                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  413                     "%s: too many channels %u, max %u\n", __func__,
  414                     reg->chaninfo.ic_nchans, IEEE80211_CHAN_MAX);
  415                 return EINVAL;
  416         }
  417         /*
  418          * Calculate freq<->IEEE mapping and default max tx power
  419          * for channels not setup.  The driver can override these
  420          * setting to reflect device properties/requirements.
  421          */
  422         for (i = 0; i < reg->chaninfo.ic_nchans; i++) {
  423                 c = &reg->chaninfo.ic_chans[i];
  424                 if (c->ic_freq == 0 || c->ic_flags == 0) {
  425                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  426                             "%s: invalid channel spec at [%u]\n", __func__, i);
  427                         return EINVAL;
  428                 }
  429                 if (c->ic_maxregpower == 0) {
  430                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  431                             "%s: invalid channel spec, zero maxregpower, "
  432                             "freq %u flags 0x%x\n", __func__,
  433                             c->ic_freq, c->ic_flags);
  434                         return EINVAL;
  435                 }
  436                 if (c->ic_ieee == 0)
  437                         c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
  438                 if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
  439                         c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
  440                             (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
  441                             c->ic_flags);
  442                 if (c->ic_maxpower == 0)
  443                         c->ic_maxpower = 2*c->ic_maxregpower;
  444         }
  445         IEEE80211_LOCK(ic);
  446         /* XXX bandaid; a running vap will likely crash */
  447         if (!allvapsdown(ic)) {
  448                 IEEE80211_UNLOCK(ic);
  449                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  450                     "%s: reject: vaps are running\n", __func__);
  451                 return EBUSY;
  452         }
  453         error = ic->ic_setregdomain(ic, &reg->rd,
  454             reg->chaninfo.ic_nchans, reg->chaninfo.ic_chans);
  455         if (error != 0) {
  456                 IEEE80211_UNLOCK(ic);
  457                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  458                     "%s: driver rejected request, error %u\n", __func__, error);
  459                 return error;
  460         }
  461         /*
  462          * Commit: copy in new channel table and reset media state.
  463          * On return the state machines will be clocked so all vaps
  464          * will reset their state.
  465          *
  466          * XXX ic_bsschan is marked undefined, must have vap's in
  467          *     INIT state or we blow up forcing stations off
  468          */
  469         /*
  470          * Save any desired channel for restore below.  Note this
  471          * needs to be done for all vaps but for now we only do
  472          * the one where the ioctl is issued.
  473          */
  474         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
  475                 desfreq = vap->iv_des_chan->ic_freq;
  476                 desflags = vap->iv_des_chan->ic_flags;
  477         }
  478         /* regdomain parameters */
  479         memcpy(&ic->ic_regdomain, &reg->rd, sizeof(reg->rd));
  480         /* channel table */
  481         memcpy(ic->ic_channels, reg->chaninfo.ic_chans,
  482             reg->chaninfo.ic_nchans * sizeof(struct ieee80211_channel));
  483         ic->ic_nchans = reg->chaninfo.ic_nchans;
  484         memset(&ic->ic_channels[ic->ic_nchans], 0,
  485             (IEEE80211_CHAN_MAX - ic->ic_nchans) *
  486                sizeof(struct ieee80211_channel));
  487         ieee80211_media_init(ic);
  488 
  489         /*
  490          * Invalidate channel-related state.
  491          */
  492         if (ic->ic_countryie != NULL) {
  493                 free(ic->ic_countryie, M_80211_NODE_IE);
  494                 ic->ic_countryie = NULL;
  495         }
  496         ieee80211_scan_flush(vap);
  497         ieee80211_dfs_reset(ic);
  498         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
  499                 c = ieee80211_find_channel(ic, desfreq, desflags);
  500                 /* NB: may be NULL if not present in new channel list */
  501                 vap->iv_des_chan = (c != NULL) ? c : IEEE80211_CHAN_ANYC;
  502         }
  503         IEEE80211_UNLOCK(ic);
  504 
  505         return 0;
  506 }

Cache object: bd22493e27e1907e87b335be7530a68b


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