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| Current File : //compat/linux/proc/68247/root/sys/net80211/ieee80211_regdomain.c |
/*-
* Copyright (c) 2005-2008 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/net80211/ieee80211_regdomain.c 188782 2009-02-19 05:21:54Z sam $");
/*
* IEEE 802.11 regdomain support.
*/
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_regdomain.h>
static void
null_getradiocaps(struct ieee80211com *ic, int maxchan,
int *n, struct ieee80211_channel *c)
{
/* just feed back the current channel list */
if (maxchan > ic->ic_nchans)
maxchan = ic->ic_nchans;
memcpy(c, ic->ic_channels, maxchan*sizeof(struct ieee80211_channel));
*n = maxchan;
}
static int
null_setregdomain(struct ieee80211com *ic,
struct ieee80211_regdomain *rd,
int nchans, struct ieee80211_channel chans[])
{
return 0; /* accept anything */
}
void
ieee80211_regdomain_attach(struct ieee80211com *ic)
{
if (ic->ic_regdomain.regdomain == 0 &&
ic->ic_regdomain.country == CTRY_DEFAULT) {
ic->ic_regdomain.country = CTRY_UNITED_STATES; /* XXX */
ic->ic_regdomain.location = ' '; /* both */
ic->ic_regdomain.isocc[0] = 'U'; /* XXX */
ic->ic_regdomain.isocc[1] = 'S'; /* XXX */
/* NB: driver calls ieee80211_init_channels or similar */
}
ic->ic_getradiocaps = null_getradiocaps;
ic->ic_setregdomain = null_setregdomain;
}
void
ieee80211_regdomain_detach(struct ieee80211com *ic)
{
if (ic->ic_countryie != NULL) {
free(ic->ic_countryie, M_80211_NODE_IE);
ic->ic_countryie = NULL;
}
}
void
ieee80211_regdomain_vattach(struct ieee80211vap *vap)
{
}
void
ieee80211_regdomain_vdetach(struct ieee80211vap *vap)
{
}
static void
addchan(struct ieee80211com *ic, int ieee, int flags)
{
struct ieee80211_channel *c;
c = &ic->ic_channels[ic->ic_nchans++];
c->ic_freq = ieee80211_ieee2mhz(ieee, flags);
c->ic_ieee = ieee;
c->ic_flags = flags;
c->ic_extieee = 0;
}
/*
* Setup the channel list for the specified regulatory domain,
* country code, and operating modes. This interface is used
* when a driver does not obtain the channel list from another
* source (such as firmware).
*/
int
ieee80211_init_channels(struct ieee80211com *ic,
const struct ieee80211_regdomain *rd, const uint8_t bands[])
{
int i;
/* XXX just do something for now */
ic->ic_nchans = 0;
if (isset(bands, IEEE80211_MODE_11B) ||
isset(bands, IEEE80211_MODE_11G)) {
int maxchan = 11;
if (rd != NULL && rd->ecm)
maxchan = 14;
for (i = 1; i <= maxchan; i++) {
if (isset(bands, IEEE80211_MODE_11B))
addchan(ic, i, IEEE80211_CHAN_B);
if (isset(bands, IEEE80211_MODE_11G))
addchan(ic, i, IEEE80211_CHAN_G);
}
}
if (isset(bands, IEEE80211_MODE_11A)) {
for (i = 36; i <= 64; i += 4)
addchan(ic, i, IEEE80211_CHAN_A);
for (i = 100; i <= 140; i += 4)
addchan(ic, i, IEEE80211_CHAN_A);
for (i = 149; i <= 161; i += 4)
addchan(ic, i, IEEE80211_CHAN_A);
}
if (rd != NULL)
ic->ic_regdomain = *rd;
return 0;
}
static __inline int
chancompar(const void *a, const void *b)
{
const struct ieee80211_channel *ca = a;
const struct ieee80211_channel *cb = b;
return (ca->ic_freq == cb->ic_freq) ?
(ca->ic_flags & IEEE80211_CHAN_ALL) -
(cb->ic_flags & IEEE80211_CHAN_ALL) :
ca->ic_freq - cb->ic_freq;
}
/*
* Insertion sort.
*/
#define swap(_a, _b, _size) { \
uint8_t *s = _b; \
int i = _size; \
do { \
uint8_t tmp = *_a; \
*_a++ = *s; \
*s++ = tmp; \
} while (--i); \
_a -= _size; \
}
static void
sort_channels(void *a, size_t n, size_t size)
{
uint8_t *aa = a;
uint8_t *ai, *t;
KASSERT(n > 0, ("no channels"));
for (ai = aa+size; --n >= 1; ai += size)
for (t = ai; t > aa; t -= size) {
uint8_t *u = t - size;
if (chancompar(u, t) <= 0)
break;
swap(u, t, size);
}
}
#undef swap
/*
* Order channels w/ the same frequency so that
* b < g < htg and a < hta. This is used to optimize
* channel table lookups and some user applications
* may also depend on it (though they should not).
*/
void
ieee80211_sort_channels(struct ieee80211_channel chans[], int nchans)
{
if (nchans > 0)
sort_channels(chans, nchans, sizeof(struct ieee80211_channel));
}
/*
* Allocate and construct a Country Information IE.
*/
struct ieee80211_appie *
ieee80211_alloc_countryie(struct ieee80211com *ic)
{
#define CHAN_UNINTERESTING \
(IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO | \
IEEE80211_CHAN_HALF | IEEE80211_CHAN_QUARTER)
/* XXX what about auto? */
/* flag set of channels to be excluded (band added below) */
static const int skipflags[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = CHAN_UNINTERESTING,
[IEEE80211_MODE_11A] = CHAN_UNINTERESTING,
[IEEE80211_MODE_11B] = CHAN_UNINTERESTING,
[IEEE80211_MODE_11G] = CHAN_UNINTERESTING,
[IEEE80211_MODE_FH] = CHAN_UNINTERESTING
| IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_CCK
| IEEE80211_CHAN_DYN,
[IEEE80211_MODE_TURBO_A] = CHAN_UNINTERESTING,
[IEEE80211_MODE_TURBO_G] = CHAN_UNINTERESTING,
[IEEE80211_MODE_STURBO_A] = CHAN_UNINTERESTING,
[IEEE80211_MODE_HALF] = IEEE80211_CHAN_TURBO
| IEEE80211_CHAN_STURBO,
[IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_TURBO
| IEEE80211_CHAN_STURBO,
[IEEE80211_MODE_11NA] = CHAN_UNINTERESTING,
[IEEE80211_MODE_11NG] = CHAN_UNINTERESTING,
};
const struct ieee80211_regdomain *rd = &ic->ic_regdomain;
uint8_t nextchan, chans[IEEE80211_CHAN_BYTES], *frm;
struct ieee80211_appie *aie;
struct ieee80211_country_ie *ie;
int i, skip, nruns;
aie = malloc(IEEE80211_COUNTRY_MAX_SIZE, M_80211_NODE_IE,
M_NOWAIT | M_ZERO);
if (aie == NULL) {
if_printf(ic->ic_ifp,
"%s: unable to allocate memory for country ie\n", __func__);
/* XXX stat */
return NULL;
}
ie = (struct ieee80211_country_ie *) aie->ie_data;
ie->ie = IEEE80211_ELEMID_COUNTRY;
if (rd->isocc[0] == '\0') {
if_printf(ic->ic_ifp, "no ISO country string for cc %d; "
"using blanks\n", rd->country);
ie->cc[0] = ie->cc[1] = ' ';
} else {
ie->cc[0] = rd->isocc[0];
ie->cc[1] = rd->isocc[1];
}
/*
* Indoor/Outdoor portion of country string:
* 'I' indoor only
* 'O' outdoor only
* ' ' all enviroments
*/
ie->cc[2] = (rd->location == 'I' ? 'I' :
rd->location == 'O' ? 'O' : ' ');
/*
* Run-length encoded channel+max tx power info.
*/
frm = (uint8_t *)&ie->band[0];
nextchan = 0; /* NB: impossible channel # */
nruns = 0;
memset(chans, 0, sizeof(chans));
skip = skipflags[ieee80211_chan2mode(ic->ic_bsschan)];
if (IEEE80211_IS_CHAN_5GHZ(ic->ic_bsschan))
skip |= IEEE80211_CHAN_2GHZ;
else if (IEEE80211_IS_CHAN_2GHZ(ic->ic_bsschan))
skip |= IEEE80211_CHAN_5GHZ;
for (i = 0; i < ic->ic_nchans; i++) {
const struct ieee80211_channel *c = &ic->ic_channels[i];
if (isset(chans, c->ic_ieee)) /* suppress dup's */
continue;
if (c->ic_flags & skip) /* skip band, etc. */
continue;
setbit(chans, c->ic_ieee);
if (c->ic_ieee != nextchan ||
c->ic_maxregpower != frm[-1]) { /* new run */
if (nruns == IEEE80211_COUNTRY_MAX_BANDS) {
if_printf(ic->ic_ifp, "%s: country ie too big, "
"runs > max %d, truncating\n",
__func__, IEEE80211_COUNTRY_MAX_BANDS);
/* XXX stat? fail? */
break;
}
frm[0] = c->ic_ieee; /* starting channel # */
frm[1] = 1; /* # channels in run */
frm[2] = c->ic_maxregpower; /* tx power cap */
frm += 3;
nextchan = c->ic_ieee + 1; /* overflow? */
nruns++;
} else { /* extend run */
frm[-2]++;
nextchan++;
}
}
ie->len = frm - ie->cc;
if (ie->len & 1) { /* Zero pad to multiple of 2 */
ie->len++;
*frm++ = 0;
}
aie->ie_len = frm - aie->ie_data;
return aie;
#undef CHAN_UNINTERESTING
}
static int
allvapsdown(struct ieee80211com *ic)
{
struct ieee80211vap *vap;
IEEE80211_LOCK_ASSERT(ic);
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
if (vap->iv_state != IEEE80211_S_INIT)
return 0;
return 1;
}
int
ieee80211_setregdomain(struct ieee80211vap *vap,
struct ieee80211_regdomain_req *reg)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_channel *c;
int desfreq = 0, desflags = 0; /* XXX silence gcc complaint */
int error, i;
if (reg->rd.location != 'I' && reg->rd.location != 'O' &&
reg->rd.location != ' ') {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
"%s: invalid location 0x%x\n", __func__, reg->rd.location);
return EINVAL;
}
if (reg->rd.isocc[0] == '\0' || reg->rd.isocc[1] == '\0') {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
"%s: invalid iso cc 0x%x:0x%x\n", __func__,
reg->rd.isocc[0], reg->rd.isocc[1]);
return EINVAL;
}
if (reg->chaninfo.ic_nchans > IEEE80211_CHAN_MAX) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
"%s: too many channels %u, max %u\n", __func__,
reg->chaninfo.ic_nchans, IEEE80211_CHAN_MAX);
return EINVAL;
}
/*
* Calculate freq<->IEEE mapping and default max tx power
* for channels not setup. The driver can override these
* setting to reflect device properties/requirements.
*/
for (i = 0; i < reg->chaninfo.ic_nchans; i++) {
c = ®->chaninfo.ic_chans[i];
if (c->ic_freq == 0 || c->ic_flags == 0) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
"%s: invalid channel spec at [%u]\n", __func__, i);
return EINVAL;
}
if (c->ic_maxregpower == 0) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
"%s: invalid channel spec, zero maxregpower, "
"freq %u flags 0x%x\n", __func__,
c->ic_freq, c->ic_flags);
return EINVAL;
}
if (c->ic_ieee == 0)
c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
(IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
c->ic_flags);
if (c->ic_maxpower == 0)
c->ic_maxpower = 2*c->ic_maxregpower;
}
IEEE80211_LOCK(ic);
/* XXX bandaid; a running vap will likely crash */
if (!allvapsdown(ic)) {
IEEE80211_UNLOCK(ic);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
"%s: reject: vaps are running\n", __func__);
return EBUSY;
}
error = ic->ic_setregdomain(ic, ®->rd,
reg->chaninfo.ic_nchans, reg->chaninfo.ic_chans);
if (error != 0) {
IEEE80211_UNLOCK(ic);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
"%s: driver rejected request, error %u\n", __func__, error);
return error;
}
/*
* Commit: copy in new channel table and reset media state.
* On return the state machines will be clocked so all vaps
* will reset their state.
*
* XXX ic_bsschan is marked undefined, must have vap's in
* INIT state or we blow up forcing stations off
*/
/*
* Save any desired channel for restore below. Note this
* needs to be done for all vaps but for now we only do
* the one where the ioctl is issued.
*/
if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
desfreq = vap->iv_des_chan->ic_freq;
desflags = vap->iv_des_chan->ic_flags;
}
/* regdomain parameters */
memcpy(&ic->ic_regdomain, ®->rd, sizeof(reg->rd));
/* channel table */
memcpy(ic->ic_channels, reg->chaninfo.ic_chans,
reg->chaninfo.ic_nchans * sizeof(struct ieee80211_channel));
ic->ic_nchans = reg->chaninfo.ic_nchans;
memset(&ic->ic_channels[ic->ic_nchans], 0,
(IEEE80211_CHAN_MAX - ic->ic_nchans) *
sizeof(struct ieee80211_channel));
ieee80211_media_init(ic);
/*
* Invalidate channel-related state.
*/
if (ic->ic_countryie != NULL) {
free(ic->ic_countryie, M_80211_NODE_IE);
ic->ic_countryie = NULL;
}
ieee80211_scan_flush(vap);
ieee80211_dfs_reset(ic);
if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
c = ieee80211_find_channel(ic, desfreq, desflags);
/* NB: may be NULL if not present in new channel list */
vap->iv_des_chan = (c != NULL) ? c : IEEE80211_CHAN_ANYC;
}
IEEE80211_UNLOCK(ic);
return 0;
}