453 lines
13 KiB
C
453 lines
13 KiB
C
/*-
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* Copyright (c) 2005-2008 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* IEEE 802.11 regdomain support.
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*/
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#include "opt_wlan.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_media.h>
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#include <net/ethernet.h>
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#include <net80211/ieee80211_var.h>
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#include <net80211/ieee80211_regdomain.h>
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static void
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null_getradiocaps(struct ieee80211com *ic, int maxchan,
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int *n, struct ieee80211_channel *c)
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{
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/* just feed back the current channel list */
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if (maxchan > ic->ic_nchans)
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maxchan = ic->ic_nchans;
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memcpy(c, ic->ic_channels, maxchan*sizeof(struct ieee80211_channel));
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*n = maxchan;
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}
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static int
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null_setregdomain(struct ieee80211com *ic,
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struct ieee80211_regdomain *rd,
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int nchans, struct ieee80211_channel chans[])
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{
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return 0; /* accept anything */
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}
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void
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ieee80211_regdomain_attach(struct ieee80211com *ic)
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{
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if (ic->ic_regdomain.regdomain == 0 &&
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ic->ic_regdomain.country == CTRY_DEFAULT) {
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ic->ic_regdomain.country = CTRY_UNITED_STATES; /* XXX */
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ic->ic_regdomain.location = ' '; /* both */
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ic->ic_regdomain.isocc[0] = 'U'; /* XXX */
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ic->ic_regdomain.isocc[1] = 'S'; /* XXX */
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/* NB: driver calls ieee80211_init_channels or similar */
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}
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ic->ic_getradiocaps = null_getradiocaps;
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ic->ic_setregdomain = null_setregdomain;
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}
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void
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ieee80211_regdomain_detach(struct ieee80211com *ic)
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{
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if (ic->ic_countryie != NULL) {
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IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
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ic->ic_countryie = NULL;
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}
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}
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void
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ieee80211_regdomain_vattach(struct ieee80211vap *vap)
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{
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}
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void
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ieee80211_regdomain_vdetach(struct ieee80211vap *vap)
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{
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}
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static const uint8_t def_chan_2ghz[] =
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{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 };
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static const uint8_t def_chan_5ghz_band1[] =
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{ 36, 40, 44, 48, 52, 56, 60, 64 };
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static const uint8_t def_chan_5ghz_band2[] =
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{ 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140 };
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static const uint8_t def_chan_5ghz_band3[] =
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{ 149, 153, 157, 161 };
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/*
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* Setup the channel list for the specified regulatory domain,
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* country code, and operating modes. This interface is used
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* when a driver does not obtain the channel list from another
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* source (such as firmware).
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*/
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int
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ieee80211_init_channels(struct ieee80211com *ic,
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const struct ieee80211_regdomain *rd, const uint8_t bands[])
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{
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struct ieee80211_channel *chans = ic->ic_channels;
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int *nchans = &ic->ic_nchans;
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int ht40;
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/* XXX just do something for now */
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ht40 = !!(ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40);
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*nchans = 0;
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if (isset(bands, IEEE80211_MODE_11B) ||
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isset(bands, IEEE80211_MODE_11G) ||
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isset(bands, IEEE80211_MODE_11NG)) {
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int nchan = nitems(def_chan_2ghz);
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if (!(rd != NULL && rd->ecm))
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nchan -= 3;
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ieee80211_add_channel_list_2ghz(chans, IEEE80211_CHAN_MAX,
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nchans, def_chan_2ghz, nchan, bands, ht40);
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}
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if (isset(bands, IEEE80211_MODE_11A) ||
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isset(bands, IEEE80211_MODE_11NA)) {
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ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
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nchans, def_chan_5ghz_band1, nitems(def_chan_5ghz_band1),
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bands, ht40);
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ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
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nchans, def_chan_5ghz_band2, nitems(def_chan_5ghz_band2),
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bands, ht40);
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ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
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nchans, def_chan_5ghz_band3, nitems(def_chan_5ghz_band3),
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bands, ht40);
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}
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if (rd != NULL)
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ic->ic_regdomain = *rd;
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return 0;
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}
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static __inline int
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chancompar(const void *a, const void *b)
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{
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const struct ieee80211_channel *ca = a;
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const struct ieee80211_channel *cb = b;
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return (ca->ic_freq == cb->ic_freq) ?
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(ca->ic_flags & IEEE80211_CHAN_ALL) -
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(cb->ic_flags & IEEE80211_CHAN_ALL) :
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ca->ic_freq - cb->ic_freq;
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}
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/*
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* Insertion sort.
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*/
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#define swap(_a, _b, _size) { \
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uint8_t *s = _b; \
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int i = _size; \
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do { \
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uint8_t tmp = *_a; \
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*_a++ = *s; \
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*s++ = tmp; \
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} while (--i); \
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_a -= _size; \
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}
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static void
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sort_channels(void *a, size_t n, size_t size)
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{
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uint8_t *aa = a;
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uint8_t *ai, *t;
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KASSERT(n > 0, ("no channels"));
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for (ai = aa+size; --n >= 1; ai += size)
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for (t = ai; t > aa; t -= size) {
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uint8_t *u = t - size;
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if (chancompar(u, t) <= 0)
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break;
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swap(u, t, size);
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}
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}
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#undef swap
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/*
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* Order channels w/ the same frequency so that
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* b < g < htg and a < hta. This is used to optimize
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* channel table lookups and some user applications
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* may also depend on it (though they should not).
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*/
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void
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ieee80211_sort_channels(struct ieee80211_channel chans[], int nchans)
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{
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if (nchans > 0)
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sort_channels(chans, nchans, sizeof(struct ieee80211_channel));
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}
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/*
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* Allocate and construct a Country Information IE.
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*/
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struct ieee80211_appie *
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ieee80211_alloc_countryie(struct ieee80211com *ic)
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{
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#define CHAN_UNINTERESTING \
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(IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO | \
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IEEE80211_CHAN_HALF | IEEE80211_CHAN_QUARTER)
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/* XXX what about auto? */
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/* flag set of channels to be excluded (band added below) */
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static const int skipflags[IEEE80211_MODE_MAX] = {
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[IEEE80211_MODE_AUTO] = CHAN_UNINTERESTING,
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[IEEE80211_MODE_11A] = CHAN_UNINTERESTING,
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[IEEE80211_MODE_11B] = CHAN_UNINTERESTING,
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[IEEE80211_MODE_11G] = CHAN_UNINTERESTING,
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[IEEE80211_MODE_FH] = CHAN_UNINTERESTING
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| IEEE80211_CHAN_OFDM
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| IEEE80211_CHAN_CCK
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| IEEE80211_CHAN_DYN,
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[IEEE80211_MODE_TURBO_A] = CHAN_UNINTERESTING,
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[IEEE80211_MODE_TURBO_G] = CHAN_UNINTERESTING,
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[IEEE80211_MODE_STURBO_A] = CHAN_UNINTERESTING,
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[IEEE80211_MODE_HALF] = IEEE80211_CHAN_TURBO
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| IEEE80211_CHAN_STURBO,
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[IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_TURBO
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| IEEE80211_CHAN_STURBO,
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[IEEE80211_MODE_11NA] = CHAN_UNINTERESTING,
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[IEEE80211_MODE_11NG] = CHAN_UNINTERESTING,
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};
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const struct ieee80211_regdomain *rd = &ic->ic_regdomain;
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uint8_t nextchan, chans[IEEE80211_CHAN_BYTES], *frm;
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struct ieee80211_appie *aie;
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struct ieee80211_country_ie *ie;
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int i, skip, nruns;
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aie = IEEE80211_MALLOC(IEEE80211_COUNTRY_MAX_SIZE, M_80211_NODE_IE,
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IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
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if (aie == NULL) {
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ic_printf(ic, "%s: unable to allocate memory for country ie\n",
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__func__);
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/* XXX stat */
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return NULL;
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}
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ie = (struct ieee80211_country_ie *) aie->ie_data;
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ie->ie = IEEE80211_ELEMID_COUNTRY;
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if (rd->isocc[0] == '\0') {
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ic_printf(ic, "no ISO country string for cc %d; using blanks\n",
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rd->country);
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ie->cc[0] = ie->cc[1] = ' ';
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} else {
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ie->cc[0] = rd->isocc[0];
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ie->cc[1] = rd->isocc[1];
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}
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/*
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* Indoor/Outdoor portion of country string:
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* 'I' indoor only
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* 'O' outdoor only
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* ' ' all environments
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*/
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ie->cc[2] = (rd->location == 'I' ? 'I' :
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rd->location == 'O' ? 'O' : ' ');
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/*
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* Run-length encoded channel+max tx power info.
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*/
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frm = (uint8_t *)&ie->band[0];
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nextchan = 0; /* NB: impossible channel # */
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nruns = 0;
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memset(chans, 0, sizeof(chans));
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skip = skipflags[ieee80211_chan2mode(ic->ic_bsschan)];
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if (IEEE80211_IS_CHAN_5GHZ(ic->ic_bsschan))
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skip |= IEEE80211_CHAN_2GHZ;
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else if (IEEE80211_IS_CHAN_2GHZ(ic->ic_bsschan))
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skip |= IEEE80211_CHAN_5GHZ;
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for (i = 0; i < ic->ic_nchans; i++) {
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const struct ieee80211_channel *c = &ic->ic_channels[i];
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if (isset(chans, c->ic_ieee)) /* suppress dup's */
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continue;
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if (c->ic_flags & skip) /* skip band, etc. */
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continue;
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setbit(chans, c->ic_ieee);
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if (c->ic_ieee != nextchan ||
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c->ic_maxregpower != frm[-1]) { /* new run */
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if (nruns == IEEE80211_COUNTRY_MAX_BANDS) {
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ic_printf(ic, "%s: country ie too big, "
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"runs > max %d, truncating\n",
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__func__, IEEE80211_COUNTRY_MAX_BANDS);
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/* XXX stat? fail? */
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break;
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}
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frm[0] = c->ic_ieee; /* starting channel # */
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frm[1] = 1; /* # channels in run */
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frm[2] = c->ic_maxregpower; /* tx power cap */
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frm += 3;
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nextchan = c->ic_ieee + 1; /* overflow? */
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nruns++;
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} else { /* extend run */
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frm[-2]++;
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nextchan++;
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}
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}
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ie->len = frm - ie->cc;
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if (ie->len & 1) { /* Zero pad to multiple of 2 */
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ie->len++;
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*frm++ = 0;
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}
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aie->ie_len = frm - aie->ie_data;
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return aie;
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#undef CHAN_UNINTERESTING
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}
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static int
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allvapsdown(struct ieee80211com *ic)
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{
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struct ieee80211vap *vap;
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IEEE80211_LOCK_ASSERT(ic);
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TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
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if (vap->iv_state != IEEE80211_S_INIT)
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return 0;
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return 1;
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}
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int
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ieee80211_setregdomain(struct ieee80211vap *vap,
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struct ieee80211_regdomain_req *reg)
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{
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struct ieee80211com *ic = vap->iv_ic;
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struct ieee80211_channel *c;
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int desfreq = 0, desflags = 0; /* XXX silence gcc complaint */
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int error, i;
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if (reg->rd.location != 'I' && reg->rd.location != 'O' &&
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reg->rd.location != ' ') {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
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"%s: invalid location 0x%x\n", __func__, reg->rd.location);
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return EINVAL;
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}
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if (reg->rd.isocc[0] == '\0' || reg->rd.isocc[1] == '\0') {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
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"%s: invalid iso cc 0x%x:0x%x\n", __func__,
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reg->rd.isocc[0], reg->rd.isocc[1]);
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return EINVAL;
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}
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if (reg->chaninfo.ic_nchans > IEEE80211_CHAN_MAX) {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
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"%s: too many channels %u, max %u\n", __func__,
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reg->chaninfo.ic_nchans, IEEE80211_CHAN_MAX);
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return EINVAL;
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}
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/*
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* Calculate freq<->IEEE mapping and default max tx power
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* for channels not setup. The driver can override these
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* setting to reflect device properties/requirements.
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*/
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for (i = 0; i < reg->chaninfo.ic_nchans; i++) {
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c = ®->chaninfo.ic_chans[i];
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if (c->ic_freq == 0 || c->ic_flags == 0) {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
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"%s: invalid channel spec at [%u]\n", __func__, i);
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return EINVAL;
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}
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if (c->ic_maxregpower == 0) {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
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"%s: invalid channel spec, zero maxregpower, "
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"freq %u flags 0x%x\n", __func__,
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c->ic_freq, c->ic_flags);
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return EINVAL;
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}
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if (c->ic_ieee == 0)
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c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
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if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
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c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
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(IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
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c->ic_flags);
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if (c->ic_maxpower == 0)
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c->ic_maxpower = 2*c->ic_maxregpower;
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}
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IEEE80211_LOCK(ic);
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/* XXX bandaid; a running vap will likely crash */
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if (!allvapsdown(ic)) {
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IEEE80211_UNLOCK(ic);
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
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"%s: reject: vaps are running\n", __func__);
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return EBUSY;
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}
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error = ic->ic_setregdomain(ic, ®->rd,
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reg->chaninfo.ic_nchans, reg->chaninfo.ic_chans);
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if (error != 0) {
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IEEE80211_UNLOCK(ic);
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
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"%s: driver rejected request, error %u\n", __func__, error);
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return error;
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}
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/*
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* Commit: copy in new channel table and reset media state.
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* On return the state machines will be clocked so all vaps
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* will reset their state.
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*
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* XXX ic_bsschan is marked undefined, must have vap's in
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* INIT state or we blow up forcing stations off
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*/
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/*
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* Save any desired channel for restore below. Note this
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* needs to be done for all vaps but for now we only do
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* the one where the ioctl is issued.
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*/
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if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
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desfreq = vap->iv_des_chan->ic_freq;
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desflags = vap->iv_des_chan->ic_flags;
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}
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/* regdomain parameters */
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memcpy(&ic->ic_regdomain, ®->rd, sizeof(reg->rd));
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/* channel table */
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memcpy(ic->ic_channels, reg->chaninfo.ic_chans,
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reg->chaninfo.ic_nchans * sizeof(struct ieee80211_channel));
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ic->ic_nchans = reg->chaninfo.ic_nchans;
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memset(&ic->ic_channels[ic->ic_nchans], 0,
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(IEEE80211_CHAN_MAX - ic->ic_nchans) *
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sizeof(struct ieee80211_channel));
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ieee80211_chan_init(ic);
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/*
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* Invalidate channel-related state.
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*/
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if (ic->ic_countryie != NULL) {
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IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
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ic->ic_countryie = NULL;
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}
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ieee80211_scan_flush(vap);
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ieee80211_dfs_reset(ic);
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if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
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c = ieee80211_find_channel(ic, desfreq, desflags);
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/* NB: may be NULL if not present in new channel list */
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vap->iv_des_chan = (c != NULL) ? c : IEEE80211_CHAN_ANYC;
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}
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IEEE80211_UNLOCK(ic);
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return 0;
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}
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