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/11.0/sys/net80211/ieee80211_regdomain.c 300738 2016-05-26 13:14:08Z avos $");
   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 #include <sys/malloc.h>
   38 #include <sys/socket.h>
   39 
   40 #include <net/if.h>
   41 #include <net/if_var.h>
   42 #include <net/if_media.h>
   43 #include <net/ethernet.h>
   44 
   45 #include <net80211/ieee80211_var.h>
   46 #include <net80211/ieee80211_regdomain.h>
   47 
   48 static void
   49 null_getradiocaps(struct ieee80211com *ic, int maxchan,
   50         int *n, struct ieee80211_channel *c)
   51 {
   52         /* just feed back the current channel list */
   53         if (maxchan > ic->ic_nchans)
   54                 maxchan = ic->ic_nchans;
   55         memcpy(c, ic->ic_channels, maxchan*sizeof(struct ieee80211_channel));
   56         *n = maxchan;
   57 }
   58 
   59 static int
   60 null_setregdomain(struct ieee80211com *ic,
   61         struct ieee80211_regdomain *rd,
   62         int nchans, struct ieee80211_channel chans[])
   63 {
   64         return 0;               /* accept anything */
   65 }
   66 
   67 void
   68 ieee80211_regdomain_attach(struct ieee80211com *ic)
   69 {
   70         if (ic->ic_regdomain.regdomain == 0 &&
   71             ic->ic_regdomain.country == CTRY_DEFAULT) {
   72                 ic->ic_regdomain.location = ' ';                /* both */
   73                 /* NB: driver calls ieee80211_init_channels or similar */
   74         }
   75         ic->ic_getradiocaps = null_getradiocaps;
   76         ic->ic_setregdomain = null_setregdomain;
   77 }
   78 
   79 void
   80 ieee80211_regdomain_detach(struct ieee80211com *ic)
   81 {
   82         if (ic->ic_countryie != NULL) {
   83                 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
   84                 ic->ic_countryie = NULL;
   85         }
   86 }
   87 
   88 void
   89 ieee80211_regdomain_vattach(struct ieee80211vap *vap)
   90 {
   91 }
   92 
   93 void
   94 ieee80211_regdomain_vdetach(struct ieee80211vap *vap)
   95 {
   96 }
   97 
   98 static const uint8_t def_chan_2ghz[] =
   99     { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 };
  100 static const uint8_t def_chan_5ghz_band1[] =
  101     { 36, 40, 44, 48, 52, 56, 60, 64 };
  102 static const uint8_t def_chan_5ghz_band2[] =
  103     { 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140 };
  104 static const uint8_t def_chan_5ghz_band3[] =
  105     { 149, 153, 157, 161 };
  106 
  107 /*
  108  * Setup the channel list for the specified regulatory domain,
  109  * country code, and operating modes.  This interface is used
  110  * when a driver does not obtain the channel list from another
  111  * source (such as firmware).
  112  */
  113 int
  114 ieee80211_init_channels(struct ieee80211com *ic,
  115         const struct ieee80211_regdomain *rd, const uint8_t bands[])
  116 {
  117         struct ieee80211_channel *chans = ic->ic_channels;
  118         int *nchans = &ic->ic_nchans;
  119         int ht40;
  120 
  121         /* XXX just do something for now */
  122         ht40 = !!(ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40);
  123         *nchans = 0;
  124         if (isset(bands, IEEE80211_MODE_11B) ||
  125             isset(bands, IEEE80211_MODE_11G) ||
  126             isset(bands, IEEE80211_MODE_11NG)) {
  127                 int nchan = nitems(def_chan_2ghz);
  128                 if (!(rd != NULL && rd->ecm))
  129                         nchan -= 3;
  130 
  131                 ieee80211_add_channel_list_2ghz(chans, IEEE80211_CHAN_MAX,
  132                     nchans, def_chan_2ghz, nchan, bands, ht40);
  133         }
  134         if (isset(bands, IEEE80211_MODE_11A) ||
  135             isset(bands, IEEE80211_MODE_11NA)) {
  136                 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
  137                     nchans, def_chan_5ghz_band1, nitems(def_chan_5ghz_band1),
  138                     bands, ht40);
  139                 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
  140                     nchans, def_chan_5ghz_band2, nitems(def_chan_5ghz_band2),
  141                     bands, ht40);
  142                 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
  143                     nchans, def_chan_5ghz_band3, nitems(def_chan_5ghz_band3),
  144                     bands, ht40);
  145         }
  146         if (rd != NULL)
  147                 ic->ic_regdomain = *rd;
  148 
  149         return 0;
  150 }
  151 
  152 static __inline int
  153 chancompar(const void *a, const void *b)
  154 {
  155         const struct ieee80211_channel *ca = a;
  156         const struct ieee80211_channel *cb = b;
  157 
  158         return (ca->ic_freq == cb->ic_freq) ?
  159                 (ca->ic_flags & IEEE80211_CHAN_ALL) -
  160                     (cb->ic_flags & IEEE80211_CHAN_ALL) :
  161                 ca->ic_freq - cb->ic_freq;
  162 }
  163 
  164 /*
  165  * Insertion sort.
  166  */
  167 #define swap(_a, _b, _size) {                   \
  168         uint8_t *s = _b;                        \
  169         int i = _size;                          \
  170         do {                                    \
  171                 uint8_t tmp = *_a;              \
  172                 *_a++ = *s;                     \
  173                 *s++ = tmp;                     \
  174         } while (--i);                          \
  175         _a -= _size;                            \
  176 }
  177 
  178 static void
  179 sort_channels(void *a, size_t n, size_t size)
  180 {
  181         uint8_t *aa = a;
  182         uint8_t *ai, *t;
  183 
  184         KASSERT(n > 0, ("no channels"));
  185         for (ai = aa+size; --n >= 1; ai += size)
  186                 for (t = ai; t > aa; t -= size) {
  187                         uint8_t *u = t - size;
  188                         if (chancompar(u, t) <= 0)
  189                                 break;
  190                         swap(u, t, size);
  191                 }
  192 }
  193 #undef swap
  194 
  195 /*
  196  * Order channels w/ the same frequency so that
  197  * b < g < htg and a < hta.  This is used to optimize
  198  * channel table lookups and some user applications
  199  * may also depend on it (though they should not).
  200  */
  201 void
  202 ieee80211_sort_channels(struct ieee80211_channel chans[], int nchans)
  203 {
  204         if (nchans > 0)
  205                 sort_channels(chans, nchans, sizeof(struct ieee80211_channel));
  206 }
  207 
  208 /*
  209  * Allocate and construct a Country Information IE.
  210  */
  211 struct ieee80211_appie *
  212 ieee80211_alloc_countryie(struct ieee80211com *ic)
  213 {
  214 #define CHAN_UNINTERESTING \
  215     (IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO | \
  216      IEEE80211_CHAN_HALF | IEEE80211_CHAN_QUARTER)
  217         /* XXX what about auto? */
  218         /* flag set of channels to be excluded (band added below) */
  219         static const int skipflags[IEEE80211_MODE_MAX] = {
  220             [IEEE80211_MODE_AUTO]       = CHAN_UNINTERESTING,
  221             [IEEE80211_MODE_11A]        = CHAN_UNINTERESTING,
  222             [IEEE80211_MODE_11B]        = CHAN_UNINTERESTING,
  223             [IEEE80211_MODE_11G]        = CHAN_UNINTERESTING,
  224             [IEEE80211_MODE_FH]         = CHAN_UNINTERESTING
  225                                         | IEEE80211_CHAN_OFDM
  226                                         | IEEE80211_CHAN_CCK
  227                                         | IEEE80211_CHAN_DYN,
  228             [IEEE80211_MODE_TURBO_A]    = CHAN_UNINTERESTING,
  229             [IEEE80211_MODE_TURBO_G]    = CHAN_UNINTERESTING,
  230             [IEEE80211_MODE_STURBO_A]   = CHAN_UNINTERESTING,
  231             [IEEE80211_MODE_HALF]       = IEEE80211_CHAN_TURBO
  232                                         | IEEE80211_CHAN_STURBO,
  233             [IEEE80211_MODE_QUARTER]    = IEEE80211_CHAN_TURBO
  234                                         | IEEE80211_CHAN_STURBO,
  235             [IEEE80211_MODE_11NA]       = CHAN_UNINTERESTING,
  236             [IEEE80211_MODE_11NG]       = CHAN_UNINTERESTING,
  237         };
  238         const struct ieee80211_regdomain *rd = &ic->ic_regdomain;
  239         uint8_t nextchan, chans[IEEE80211_CHAN_BYTES], *frm;
  240         struct ieee80211_appie *aie;
  241         struct ieee80211_country_ie *ie;
  242         int i, skip, nruns;
  243 
  244         aie = IEEE80211_MALLOC(IEEE80211_COUNTRY_MAX_SIZE, M_80211_NODE_IE,
  245             IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
  246         if (aie == NULL) {
  247                 ic_printf(ic, "%s: unable to allocate memory for country ie\n",
  248                     __func__);
  249                 /* XXX stat */
  250                 return NULL;
  251         }
  252         ie = (struct ieee80211_country_ie *) aie->ie_data;
  253         ie->ie = IEEE80211_ELEMID_COUNTRY;
  254         if (rd->isocc[0] == '\0') {
  255                 ic_printf(ic, "no ISO country string for cc %d; using blanks\n",
  256                     rd->country);
  257                 ie->cc[0] = ie->cc[1] = ' ';
  258         } else {
  259                 ie->cc[0] = rd->isocc[0];
  260                 ie->cc[1] = rd->isocc[1];
  261         }
  262         /* 
  263          * Indoor/Outdoor portion of country string:
  264          *     'I' indoor only
  265          *     'O' outdoor only
  266          *     ' ' all environments
  267          */
  268         ie->cc[2] = (rd->location == 'I' ? 'I' :
  269                      rd->location == 'O' ? 'O' : ' ');
  270         /* 
  271          * Run-length encoded channel+max tx power info.
  272          */
  273         frm = (uint8_t *)&ie->band[0];
  274         nextchan = 0;                   /* NB: impossible channel # */
  275         nruns = 0;
  276         memset(chans, 0, sizeof(chans));
  277         skip = skipflags[ieee80211_chan2mode(ic->ic_bsschan)];
  278         if (IEEE80211_IS_CHAN_5GHZ(ic->ic_bsschan))
  279                 skip |= IEEE80211_CHAN_2GHZ;
  280         else if (IEEE80211_IS_CHAN_2GHZ(ic->ic_bsschan))
  281                 skip |= IEEE80211_CHAN_5GHZ;
  282         for (i = 0; i < ic->ic_nchans; i++) {
  283                 const struct ieee80211_channel *c = &ic->ic_channels[i];
  284 
  285                 if (isset(chans, c->ic_ieee))           /* suppress dup's */
  286                         continue;
  287                 if (c->ic_flags & skip)                 /* skip band, etc. */
  288                         continue;
  289                 setbit(chans, c->ic_ieee);
  290                 if (c->ic_ieee != nextchan ||
  291                     c->ic_maxregpower != frm[-1]) {     /* new run */
  292                         if (nruns == IEEE80211_COUNTRY_MAX_BANDS) {
  293                                 ic_printf(ic, "%s: country ie too big, "
  294                                     "runs > max %d, truncating\n",
  295                                     __func__, IEEE80211_COUNTRY_MAX_BANDS);
  296                                 /* XXX stat? fail? */
  297                                 break;
  298                         }
  299                         frm[0] = c->ic_ieee;            /* starting channel # */
  300                         frm[1] = 1;                     /* # channels in run */
  301                         frm[2] = c->ic_maxregpower;     /* tx power cap */
  302                         frm += 3;
  303                         nextchan = c->ic_ieee + 1;      /* overflow? */
  304                         nruns++;
  305                 } else {                                /* extend run */
  306                         frm[-2]++;
  307                         nextchan++;
  308                 }
  309         }
  310         ie->len = frm - ie->cc;
  311         if (ie->len & 1) {              /* Zero pad to multiple of 2 */
  312                 ie->len++;
  313                 *frm++ = 0;
  314         }
  315         aie->ie_len = frm - aie->ie_data;
  316 
  317         return aie;
  318 #undef CHAN_UNINTERESTING
  319 }
  320 
  321 static int
  322 allvapsdown(struct ieee80211com *ic)
  323 {
  324         struct ieee80211vap *vap;
  325 
  326         IEEE80211_LOCK_ASSERT(ic);
  327         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  328                 if (vap->iv_state != IEEE80211_S_INIT)
  329                         return 0;
  330         return 1;
  331 }
  332 
  333 int
  334 ieee80211_setregdomain(struct ieee80211vap *vap,
  335     struct ieee80211_regdomain_req *reg)
  336 {
  337         struct ieee80211com *ic = vap->iv_ic;
  338         struct ieee80211_channel *c;
  339         int desfreq = 0, desflags = 0;          /* XXX silence gcc complaint */
  340         int error, i;
  341 
  342         if (reg->rd.location != 'I' && reg->rd.location != 'O' &&
  343             reg->rd.location != ' ') {
  344                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  345                     "%s: invalid location 0x%x\n", __func__, reg->rd.location);
  346                 return EINVAL;
  347         }
  348         if (reg->rd.isocc[0] == '\0' || reg->rd.isocc[1] == '\0') {
  349                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  350                     "%s: invalid iso cc 0x%x:0x%x\n", __func__,
  351                     reg->rd.isocc[0], reg->rd.isocc[1]);
  352                 return EINVAL;
  353         }
  354         if (reg->chaninfo.ic_nchans > IEEE80211_CHAN_MAX) {
  355                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  356                     "%s: too many channels %u, max %u\n", __func__,
  357                     reg->chaninfo.ic_nchans, IEEE80211_CHAN_MAX);
  358                 return EINVAL;
  359         }
  360         /*
  361          * Calculate freq<->IEEE mapping and default max tx power
  362          * for channels not setup.  The driver can override these
  363          * setting to reflect device properties/requirements.
  364          */
  365         for (i = 0; i < reg->chaninfo.ic_nchans; i++) {
  366                 c = &reg->chaninfo.ic_chans[i];
  367                 if (c->ic_freq == 0 || c->ic_flags == 0) {
  368                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  369                             "%s: invalid channel spec at [%u]\n", __func__, i);
  370                         return EINVAL;
  371                 }
  372                 if (c->ic_maxregpower == 0) {
  373                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  374                             "%s: invalid channel spec, zero maxregpower, "
  375                             "freq %u flags 0x%x\n", __func__,
  376                             c->ic_freq, c->ic_flags);
  377                         return EINVAL;
  378                 }
  379                 if (c->ic_ieee == 0)
  380                         c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
  381                 if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
  382                         c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
  383                             (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
  384                             c->ic_flags);
  385                 if (c->ic_maxpower == 0)
  386                         c->ic_maxpower = 2*c->ic_maxregpower;
  387         }
  388         IEEE80211_LOCK(ic);
  389         /* XXX bandaid; a running vap will likely crash */
  390         if (!allvapsdown(ic)) {
  391                 IEEE80211_UNLOCK(ic);
  392                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  393                     "%s: reject: vaps are running\n", __func__);
  394                 return EBUSY;
  395         }
  396         error = ic->ic_setregdomain(ic, &reg->rd,
  397             reg->chaninfo.ic_nchans, reg->chaninfo.ic_chans);
  398         if (error != 0) {
  399                 IEEE80211_UNLOCK(ic);
  400                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
  401                     "%s: driver rejected request, error %u\n", __func__, error);
  402                 return error;
  403         }
  404         /*
  405          * Commit: copy in new channel table and reset media state.
  406          * On return the state machines will be clocked so all vaps
  407          * will reset their state.
  408          *
  409          * XXX ic_bsschan is marked undefined, must have vap's in
  410          *     INIT state or we blow up forcing stations off
  411          */
  412         /*
  413          * Save any desired channel for restore below.  Note this
  414          * needs to be done for all vaps but for now we only do
  415          * the one where the ioctl is issued.
  416          */
  417         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
  418                 desfreq = vap->iv_des_chan->ic_freq;
  419                 desflags = vap->iv_des_chan->ic_flags;
  420         }
  421         /* regdomain parameters */
  422         memcpy(&ic->ic_regdomain, &reg->rd, sizeof(reg->rd));
  423         /* channel table */
  424         memcpy(ic->ic_channels, reg->chaninfo.ic_chans,
  425             reg->chaninfo.ic_nchans * sizeof(struct ieee80211_channel));
  426         ic->ic_nchans = reg->chaninfo.ic_nchans;
  427         memset(&ic->ic_channels[ic->ic_nchans], 0,
  428             (IEEE80211_CHAN_MAX - ic->ic_nchans) *
  429                sizeof(struct ieee80211_channel));
  430         ieee80211_chan_init(ic);
  431 
  432         /*
  433          * Invalidate channel-related state.
  434          */
  435         if (ic->ic_countryie != NULL) {
  436                 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
  437                 ic->ic_countryie = NULL;
  438         }
  439         ieee80211_scan_flush(vap);
  440         ieee80211_dfs_reset(ic);
  441         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
  442                 c = ieee80211_find_channel(ic, desfreq, desflags);
  443                 /* NB: may be NULL if not present in new channel list */
  444                 vap->iv_des_chan = (c != NULL) ? c : IEEE80211_CHAN_ANYC;
  445         }
  446         IEEE80211_UNLOCK(ic);
  447 
  448         return 0;
  449 }

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