sys/netproto/802_11/wlan/ieee80211_regdomain.c

   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("$FreeBSD$");
  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 <netproto/802_11/ieee80211_var.h>
  46 #include <netproto/802_11/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.country = CTRY_UNITED_STATES;  /* XXX */
  73                 ic->ic_regdomain.location = ' ';                /* both */
  74                 ic->ic_regdomain.isocc[0] = 'U';                /* XXX */
  75                 ic->ic_regdomain.isocc[1] = 'S';                /* XXX */
  76                 /* NB: driver calls ieee80211_init_channels or similar */
  77         }
  78         ic->ic_getradiocaps = null_getradiocaps;
  79         ic->ic_setregdomain = null_setregdomain;
  80 }
  81
  82 void
  83 ieee80211_regdomain_detach(struct ieee80211com *ic)
  84 {
  85         if (ic->ic_countryie != NULL) {
  86                 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
  87                 ic->ic_countryie = NULL;
  88         }
  89 }
  90
  91 void
  92 ieee80211_regdomain_vattach(struct ieee80211vap *vap)
  93 {
  94 }
  95
  96 void
  97 ieee80211_regdomain_vdetach(struct ieee80211vap *vap)
  98 {
  99 }
 100
 101 static const uint8_t def_chan_2ghz[] =
 102     { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 };
 103 static const uint8_t def_chan_5ghz_band1[] =
 104     { 36, 40, 44, 48, 52, 56, 60, 64 };
 105 static const uint8_t def_chan_5ghz_band2[] =
 106     { 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140 };
 107 static const uint8_t def_chan_5ghz_band3[] =
 108     { 149, 153, 157, 161 };
 109
 110 /*
 111  * Setup the channel list for the specified regulatory domain,
 112  * country code, and operating modes.  This interface is used
 113  * when a driver does not obtain the channel list from another
 114  * source (such as firmware).
 115  */
 116 int
 117 ieee80211_init_channels(struct ieee80211com *ic,
 118         const struct ieee80211_regdomain *rd, const uint8_t bands[])
 119 {
 120         struct ieee80211_channel *chans = ic->ic_channels;
 121         int *nchans = &ic->ic_nchans;
 122         int ht40;
 123
 124         /* XXX just do something for now */
 125         ht40 = !!(ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40);
 126         *nchans = 0;
 127         if (isset(bands, IEEE80211_MODE_11B) ||
 128             isset(bands, IEEE80211_MODE_11G) ||
 129             isset(bands, IEEE80211_MODE_11NG)) {
 130                 int nchan = nitems(def_chan_2ghz);
 131                 if (!(rd != NULL && rd->ecm))
 132                         nchan -= 3;
 133
 134                 ieee80211_add_channel_list_2ghz(chans, IEEE80211_CHAN_MAX,
 135                     nchans, def_chan_2ghz, nchan, bands, ht40);
 136         }
 137         if (isset(bands, IEEE80211_MODE_11A) ||
 138             isset(bands, IEEE80211_MODE_11NA)) {
 139                 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
 140                     nchans, def_chan_5ghz_band1, nitems(def_chan_5ghz_band1),
 141                     bands, ht40);
 142                 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
 143                     nchans, def_chan_5ghz_band2, nitems(def_chan_5ghz_band2),
 144                     bands, ht40);
 145                 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
 146                     nchans, def_chan_5ghz_band3, nitems(def_chan_5ghz_band3),
 147                     bands, ht40);
 148         }
 149         if (rd != NULL)
 150                 ic->ic_regdomain = *rd;
 151
 152         return 0;
 153 }
 154
 155 static __inline int
 156 chancompar(const void *a, const void *b)
 157 {
 158         const struct ieee80211_channel *ca = a;
 159         const struct ieee80211_channel *cb = b;
 160
 161         return (ca->ic_freq == cb->ic_freq) ?
 162                 (ca->ic_flags & IEEE80211_CHAN_ALL) -
 163                     (cb->ic_flags & IEEE80211_CHAN_ALL) :
 164                 ca->ic_freq - cb->ic_freq;
 165 }
 166
 167 /*
 168  * Insertion sort.
 169  */
 170 #define swap(_a, _b, _size) {                   \
 171         uint8_t *s = _b;                        \
 172         int i = _size;                          \
 173         do {                                    \
 174                 uint8_t tmp = *_a;              \
 175                 *_a++ = *s;                     \
 176                 *s++ = tmp;                     \
 177         } while (--i);                          \
 178         _a -= _size;                            \
 179 }
 180
 181 static void
 182 sort_channels(void *a, size_t n, size_t size)
 183 {
 184         uint8_t *aa = a;
 185         uint8_t *ai, *t;
 186
 187         KASSERT(n > 0, ("no channels"));
 188         for (ai = aa+size; --n >= 1; ai += size)
 189                 for (t = ai; t > aa; t -= size) {
 190                         uint8_t *u = t - size;
 191                         if (chancompar(u, t) <= 0)
 192                                 break;
 193                         swap(u, t, size);
 194                 }
 195 }
 196 #undef swap
 197
 198 /*
 199  * Order channels w/ the same frequency so that
 200  * b < g < htg and a < hta.  This is used to optimize
 201  * channel table lookups and some user applications
 202  * may also depend on it (though they should not).
 203  */
 204 void
 205 ieee80211_sort_channels(struct ieee80211_channel chans[], int nchans)
 206 {
 207         if (nchans > 0)
 208                 sort_channels(chans, nchans, sizeof(struct ieee80211_channel));
 209 }
 210
 211 /*
 212  * Allocate and construct a Country Information IE.
 213  */
 214 struct ieee80211_appie *
 215 ieee80211_alloc_countryie(struct ieee80211com *ic)
 216 {
 217 #define CHAN_UNINTERESTING \
 218     (IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO | \
 219      IEEE80211_CHAN_HALF | IEEE80211_CHAN_QUARTER)
 220         /* XXX what about auto? */
 221         /* flag set of channels to be excluded (band added below) */
 222         static const int skipflags[IEEE80211_MODE_MAX] = {
 223             [IEEE80211_MODE_AUTO]       = CHAN_UNINTERESTING,
 224             [IEEE80211_MODE_11A]        = CHAN_UNINTERESTING,
 225             [IEEE80211_MODE_11B]        = CHAN_UNINTERESTING,
 226             [IEEE80211_MODE_11G]        = CHAN_UNINTERESTING,
 227             [IEEE80211_MODE_FH]         = CHAN_UNINTERESTING
 228                                         | IEEE80211_CHAN_OFDM
 229                                         | IEEE80211_CHAN_CCK
 230                                         | IEEE80211_CHAN_DYN,
 231             [IEEE80211_MODE_TURBO_A]    = CHAN_UNINTERESTING,
 232             [IEEE80211_MODE_TURBO_G]    = CHAN_UNINTERESTING,
 233             [IEEE80211_MODE_STURBO_A]   = CHAN_UNINTERESTING,
 234             [IEEE80211_MODE_HALF]       = IEEE80211_CHAN_TURBO
 235                                         | IEEE80211_CHAN_STURBO,
 236             [IEEE80211_MODE_QUARTER]    = IEEE80211_CHAN_TURBO
 237                                         | IEEE80211_CHAN_STURBO,
 238             [IEEE80211_MODE_11NA]       = CHAN_UNINTERESTING,
 239             [IEEE80211_MODE_11NG]       = CHAN_UNINTERESTING,
 240         };
 241         const struct ieee80211_regdomain *rd = &ic->ic_regdomain;
 242         uint8_t nextchan, chans[IEEE80211_CHAN_BYTES], *frm;
 243         struct ieee80211_appie *aie;
 244         struct ieee80211_country_ie *ie;
 245         int i, skip, nruns;
 246
 247 #if defined(__DragonFly__)
 248         aie = kmalloc(IEEE80211_COUNTRY_MAX_SIZE, M_80211_NODE_IE,
 249             M_INTWAIT | M_ZERO);
 250 #else
 251         aie = IEEE80211_MALLOC(IEEE80211_COUNTRY_MAX_SIZE, M_80211_NODE_IE,
 252             IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
 253 #endif
 254         if (aie == NULL) {
 255                 ic_printf(ic, "%s: unable to allocate memory for country ie\n",
 256                     __func__);
 257                 /* XXX stat */
 258                 return NULL;
 259         }
 260         ie = (struct ieee80211_country_ie *) aie->ie_data;
 261         ie->ie = IEEE80211_ELEMID_COUNTRY;
 262         if (rd->isocc[0] == '\0') {
 263                 ic_printf(ic, "no ISO country string for cc %d; using blanks\n",
 264                     rd->country);
 265                 ie->cc[0] = ie->cc[1] = ' ';
 266         } else {
 267                 ie->cc[0] = rd->isocc[0];
 268                 ie->cc[1] = rd->isocc[1];
 269         }
 270         /*
 271          * Indoor/Outdoor portion of country string:
 272          *     'I' indoor only
 273          *     'O' outdoor only
 274          *     ' ' all environments
 275          */
 276         ie->cc[2] = (rd->location == 'I' ? 'I' :
 277                      rd->location == 'O' ? 'O' : ' ');
 278         /*
 279          * Run-length encoded channel+max tx power info.
 280          */
 281         frm = (uint8_t *)&ie->band[0];
 282         nextchan = 0;                   /* NB: impossible channel # */
 283         nruns = 0;
 284         memset(chans, 0, sizeof(chans));
 285         skip = skipflags[ieee80211_chan2mode(ic->ic_bsschan)];
 286         if (IEEE80211_IS_CHAN_5GHZ(ic->ic_bsschan))
 287                 skip |= IEEE80211_CHAN_2GHZ;
 288         else if (IEEE80211_IS_CHAN_2GHZ(ic->ic_bsschan))
 289                 skip |= IEEE80211_CHAN_5GHZ;
 290         for (i = 0; i < ic->ic_nchans; i++) {
 291                 const struct ieee80211_channel *c = &ic->ic_channels[i];
 292
 293                 if (isset(chans, c->ic_ieee))           /* suppress dup's */
 294                         continue;
 295                 if (c->ic_flags & skip)                 /* skip band, etc. */
 296                         continue;
 297                 setbit(chans, c->ic_ieee);
 298                 if (c->ic_ieee != nextchan ||
 299                     c->ic_maxregpower != frm[-1]) {     /* new run */
 300                         if (nruns == IEEE80211_COUNTRY_MAX_BANDS) {
 301                                 ic_printf(ic, "%s: country ie too big, "
 302                                     "runs > max %d, truncating\n",
 303                                     __func__, IEEE80211_COUNTRY_MAX_BANDS);
 304                                 /* XXX stat? fail? */
 305                                 break;
 306                         }
 307                         frm[0] = c->ic_ieee;            /* starting channel # */
 308                         frm[1] = 1;                     /* # channels in run */
 309                         frm[2] = c->ic_maxregpower;     /* tx power cap */
 310                         frm += 3;
 311                         nextchan = c->ic_ieee + 1;      /* overflow? */
 312                         nruns++;
 313                 } else {                                /* extend run */
 314                         frm[-2]++;
 315                         nextchan++;
 316                 }
 317         }
 318         ie->len = frm - ie->cc;
 319         if (ie->len & 1) {              /* Zero pad to multiple of 2 */
 320                 ie->len++;
 321                 *frm++ = 0;
 322         }
 323         aie->ie_len = frm - aie->ie_data;
 324
 325         return aie;
 326 #undef CHAN_UNINTERESTING
 327 }
 328
 329 static int
 330 allvapsdown(struct ieee80211com *ic)
 331 {
 332         struct ieee80211vap *vap;
 333
 334         IEEE80211_LOCK_ASSERT(ic);
 335         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
 336                 if (vap->iv_state != IEEE80211_S_INIT)
 337                         return 0;
 338         return 1;
 339 }
 340
 341 int
 342 ieee80211_setregdomain(struct ieee80211vap *vap,
 343     struct ieee80211_regdomain_req *reg)
 344 {
 345         struct ieee80211com *ic = vap->iv_ic;
 346         struct ieee80211_channel *c;
 347         int desfreq = 0, desflags = 0;          /* XXX silence gcc complaint */
 348         int error, i;
 349
 350         if (reg->rd.location != 'I' && reg->rd.location != 'O' &&
 351             reg->rd.location != ' ') {
 352                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
 353                     "%s: invalid location 0x%x\n", __func__, reg->rd.location);
 354                 return EINVAL;
 355         }
 356         if (reg->rd.isocc[0] == '\0' || reg->rd.isocc[1] == '\0') {
 357                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
 358                     "%s: invalid iso cc 0x%x:0x%x\n", __func__,
 359                     reg->rd.isocc[0], reg->rd.isocc[1]);
 360                 return EINVAL;
 361         }
 362         if (reg->chaninfo.ic_nchans > IEEE80211_CHAN_MAX) {
 363                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
 364                     "%s: too many channels %u, max %u\n", __func__,
 365                     reg->chaninfo.ic_nchans, IEEE80211_CHAN_MAX);
 366                 return EINVAL;
 367         }
 368         /*
 369          * Calculate freq<->IEEE mapping and default max tx power
 370          * for channels not setup.  The driver can override these
 371          * setting to reflect device properties/requirements.
 372          */
 373         for (i = 0; i < reg->chaninfo.ic_nchans; i++) {
 374                 c = &reg->chaninfo.ic_chans[i];
 375                 if (c->ic_freq == 0 || c->ic_flags == 0) {
 376                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
 377                             "%s: invalid channel spec at [%u]\n", __func__, i);
 378                         return EINVAL;
 379                 }
 380                 if (c->ic_maxregpower == 0) {
 381                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
 382                             "%s: invalid channel spec, zero maxregpower, "
 383                             "freq %u flags 0x%x\n", __func__,
 384                             c->ic_freq, c->ic_flags);
 385                         return EINVAL;
 386                 }
 387                 if (c->ic_ieee == 0)
 388                         c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
 389                 if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
 390                         c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
 391                             (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
 392                             c->ic_flags);
 393                 if (c->ic_maxpower == 0)
 394                         c->ic_maxpower = 2*c->ic_maxregpower;
 395         }
 396         IEEE80211_LOCK(ic);
 397         /* XXX bandaid; a running vap will likely crash */
 398         if (!allvapsdown(ic)) {
 399                 IEEE80211_UNLOCK(ic);
 400                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
 401                     "%s: reject: vaps are running\n", __func__);
 402                 return EBUSY;
 403         }
 404         error = ic->ic_setregdomain(ic, &reg->rd,
 405             reg->chaninfo.ic_nchans, reg->chaninfo.ic_chans);
 406         if (error != 0) {
 407                 IEEE80211_UNLOCK(ic);
 408                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
 409                     "%s: driver rejected request, error %u\n", __func__, error);
 410                 return error;
 411         }
 412         /*
 413          * Commit: copy in new channel table and reset media state.
 414          * On return the state machines will be clocked so all vaps
 415          * will reset their state.
 416          *
 417          * XXX ic_bsschan is marked undefined, must have vap's in
 418          *     INIT state or we blow up forcing stations off
 419          */
 420         /*
 421          * Save any desired channel for restore below.  Note this
 422          * needs to be done for all vaps but for now we only do
 423          * the one where the ioctl is issued.
 424          */
 425         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
 426                 desfreq = vap->iv_des_chan->ic_freq;
 427                 desflags = vap->iv_des_chan->ic_flags;
 428         }
 429         /* regdomain parameters */
 430         memcpy(&ic->ic_regdomain, &reg->rd, sizeof(reg->rd));
 431         /* channel table */
 432         memcpy(ic->ic_channels, reg->chaninfo.ic_chans,
 433             reg->chaninfo.ic_nchans * sizeof(struct ieee80211_channel));
 434         ic->ic_nchans = reg->chaninfo.ic_nchans;
 435         memset(&ic->ic_channels[ic->ic_nchans], 0,
 436             (IEEE80211_CHAN_MAX - ic->ic_nchans) *
 437                sizeof(struct ieee80211_channel));
 438         ieee80211_chan_init(ic);
 439
 440         /*
 441          * Invalidate channel-related state.
 442          */
 443         if (ic->ic_countryie != NULL) {
 444                 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
 445                 ic->ic_countryie = NULL;
 446         }
 447         ieee80211_scan_flush(vap);
 448         ieee80211_dfs_reset(ic);
 449         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
 450                 c = ieee80211_find_channel(ic, desfreq, desflags);
 451                 /* NB: may be NULL if not present in new channel list */
 452                 vap->iv_des_chan = (c != NULL) ? c : IEEE80211_CHAN_ANYC;
 453         }
 454         IEEE80211_UNLOCK(ic);
 455
 456         return 0;
 457 }