554 lines
13 KiB
C
554 lines
13 KiB
C
/*
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* This file contains helper code to handle channel
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* settings and keeping track of what is possible at
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* any point in time.
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*
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/export.h>
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#include <net/cfg80211.h>
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#include "core.h"
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#include "rdev-ops.h"
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void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
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struct ieee80211_channel *chan,
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enum nl80211_channel_type chan_type)
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{
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if (WARN_ON(!chan))
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return;
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chandef->chan = chan;
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chandef->center_freq2 = 0;
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switch (chan_type) {
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case NL80211_CHAN_NO_HT:
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chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
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chandef->center_freq1 = chan->center_freq;
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break;
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case NL80211_CHAN_HT20:
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chandef->width = NL80211_CHAN_WIDTH_20;
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chandef->center_freq1 = chan->center_freq;
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break;
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case NL80211_CHAN_HT40PLUS:
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chandef->width = NL80211_CHAN_WIDTH_40;
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chandef->center_freq1 = chan->center_freq + 10;
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break;
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case NL80211_CHAN_HT40MINUS:
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chandef->width = NL80211_CHAN_WIDTH_40;
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chandef->center_freq1 = chan->center_freq - 10;
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break;
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default:
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WARN_ON(1);
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}
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}
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EXPORT_SYMBOL(cfg80211_chandef_create);
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bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
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{
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u32 control_freq;
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if (!chandef->chan)
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return false;
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control_freq = chandef->chan->center_freq;
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switch (chandef->width) {
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case NL80211_CHAN_WIDTH_5:
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case NL80211_CHAN_WIDTH_10:
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case NL80211_CHAN_WIDTH_20:
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case NL80211_CHAN_WIDTH_20_NOHT:
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if (chandef->center_freq1 != control_freq)
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return false;
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if (chandef->center_freq2)
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return false;
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break;
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case NL80211_CHAN_WIDTH_40:
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if (chandef->center_freq1 != control_freq + 10 &&
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chandef->center_freq1 != control_freq - 10)
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return false;
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if (chandef->center_freq2)
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return false;
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break;
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case NL80211_CHAN_WIDTH_80P80:
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if (chandef->center_freq1 != control_freq + 30 &&
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chandef->center_freq1 != control_freq + 10 &&
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chandef->center_freq1 != control_freq - 10 &&
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chandef->center_freq1 != control_freq - 30)
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return false;
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if (!chandef->center_freq2)
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return false;
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/* adjacent is not allowed -- that's a 160 MHz channel */
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if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
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chandef->center_freq2 - chandef->center_freq1 == 80)
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return false;
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break;
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case NL80211_CHAN_WIDTH_80:
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if (chandef->center_freq1 != control_freq + 30 &&
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chandef->center_freq1 != control_freq + 10 &&
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chandef->center_freq1 != control_freq - 10 &&
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chandef->center_freq1 != control_freq - 30)
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return false;
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if (chandef->center_freq2)
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return false;
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break;
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case NL80211_CHAN_WIDTH_160:
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if (chandef->center_freq1 != control_freq + 70 &&
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chandef->center_freq1 != control_freq + 50 &&
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chandef->center_freq1 != control_freq + 30 &&
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chandef->center_freq1 != control_freq + 10 &&
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chandef->center_freq1 != control_freq - 10 &&
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chandef->center_freq1 != control_freq - 30 &&
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chandef->center_freq1 != control_freq - 50 &&
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chandef->center_freq1 != control_freq - 70)
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return false;
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if (chandef->center_freq2)
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return false;
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break;
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default:
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return false;
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}
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return true;
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}
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EXPORT_SYMBOL(cfg80211_chandef_valid);
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static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
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int *pri40, int *pri80)
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{
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int tmp;
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switch (c->width) {
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case NL80211_CHAN_WIDTH_40:
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*pri40 = c->center_freq1;
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*pri80 = 0;
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break;
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case NL80211_CHAN_WIDTH_80:
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case NL80211_CHAN_WIDTH_80P80:
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*pri80 = c->center_freq1;
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/* n_P20 */
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tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
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/* n_P40 */
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tmp /= 2;
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/* freq_P40 */
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*pri40 = c->center_freq1 - 20 + 40 * tmp;
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break;
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case NL80211_CHAN_WIDTH_160:
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/* n_P20 */
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tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
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/* n_P40 */
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tmp /= 2;
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/* freq_P40 */
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*pri40 = c->center_freq1 - 60 + 40 * tmp;
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/* n_P80 */
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tmp /= 2;
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*pri80 = c->center_freq1 - 40 + 80 * tmp;
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break;
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default:
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WARN_ON_ONCE(1);
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}
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}
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static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
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{
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int width;
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switch (c->width) {
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case NL80211_CHAN_WIDTH_5:
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width = 5;
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break;
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case NL80211_CHAN_WIDTH_10:
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width = 10;
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break;
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case NL80211_CHAN_WIDTH_20:
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case NL80211_CHAN_WIDTH_20_NOHT:
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width = 20;
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break;
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case NL80211_CHAN_WIDTH_40:
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width = 40;
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break;
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case NL80211_CHAN_WIDTH_80P80:
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case NL80211_CHAN_WIDTH_80:
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width = 80;
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break;
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case NL80211_CHAN_WIDTH_160:
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width = 160;
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break;
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default:
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WARN_ON_ONCE(1);
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return -1;
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}
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return width;
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}
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const struct cfg80211_chan_def *
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cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
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const struct cfg80211_chan_def *c2)
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{
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u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;
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/* If they are identical, return */
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if (cfg80211_chandef_identical(c1, c2))
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return c1;
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/* otherwise, must have same control channel */
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if (c1->chan != c2->chan)
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return NULL;
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/*
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* If they have the same width, but aren't identical,
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* then they can't be compatible.
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*/
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if (c1->width == c2->width)
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return NULL;
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/*
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* can't be compatible if one of them is 5 or 10 MHz,
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* but they don't have the same width.
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*/
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if (c1->width == NL80211_CHAN_WIDTH_5 ||
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c1->width == NL80211_CHAN_WIDTH_10 ||
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c2->width == NL80211_CHAN_WIDTH_5 ||
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c2->width == NL80211_CHAN_WIDTH_10)
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return NULL;
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if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
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c1->width == NL80211_CHAN_WIDTH_20)
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return c2;
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if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
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c2->width == NL80211_CHAN_WIDTH_20)
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return c1;
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chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
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chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);
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if (c1_pri40 != c2_pri40)
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return NULL;
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WARN_ON(!c1_pri80 && !c2_pri80);
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if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
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return NULL;
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if (c1->width > c2->width)
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return c1;
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return c2;
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}
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EXPORT_SYMBOL(cfg80211_chandef_compatible);
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static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
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u32 bandwidth,
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enum nl80211_dfs_state dfs_state)
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{
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struct ieee80211_channel *c;
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u32 freq;
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for (freq = center_freq - bandwidth/2 + 10;
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freq <= center_freq + bandwidth/2 - 10;
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freq += 20) {
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c = ieee80211_get_channel(wiphy, freq);
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if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
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continue;
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c->dfs_state = dfs_state;
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c->dfs_state_entered = jiffies;
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}
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}
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void cfg80211_set_dfs_state(struct wiphy *wiphy,
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const struct cfg80211_chan_def *chandef,
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enum nl80211_dfs_state dfs_state)
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{
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int width;
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if (WARN_ON(!cfg80211_chandef_valid(chandef)))
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return;
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width = cfg80211_chandef_get_width(chandef);
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if (width < 0)
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return;
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cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
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width, dfs_state);
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if (!chandef->center_freq2)
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return;
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cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
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width, dfs_state);
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}
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static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
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u32 center_freq,
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u32 bandwidth)
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{
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struct ieee80211_channel *c;
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u32 freq, start_freq, end_freq;
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if (bandwidth <= 20) {
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start_freq = center_freq;
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end_freq = center_freq;
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} else {
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start_freq = center_freq - bandwidth/2 + 10;
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end_freq = center_freq + bandwidth/2 - 10;
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}
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for (freq = start_freq; freq <= end_freq; freq += 20) {
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c = ieee80211_get_channel(wiphy, freq);
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if (!c)
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return -EINVAL;
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if (c->flags & IEEE80211_CHAN_RADAR)
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return 1;
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}
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return 0;
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}
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int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
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const struct cfg80211_chan_def *chandef)
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{
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int width;
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int r;
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if (WARN_ON(!cfg80211_chandef_valid(chandef)))
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return -EINVAL;
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width = cfg80211_chandef_get_width(chandef);
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if (width < 0)
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return -EINVAL;
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r = cfg80211_get_chans_dfs_required(wiphy, chandef->center_freq1,
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width);
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if (r)
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return r;
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if (!chandef->center_freq2)
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return 0;
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return cfg80211_get_chans_dfs_required(wiphy, chandef->center_freq2,
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width);
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}
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EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
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static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
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u32 center_freq, u32 bandwidth,
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u32 prohibited_flags)
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{
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struct ieee80211_channel *c;
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u32 freq, start_freq, end_freq;
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if (bandwidth <= 20) {
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start_freq = center_freq;
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end_freq = center_freq;
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} else {
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start_freq = center_freq - bandwidth/2 + 10;
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end_freq = center_freq + bandwidth/2 - 10;
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}
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for (freq = start_freq; freq <= end_freq; freq += 20) {
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c = ieee80211_get_channel(wiphy, freq);
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if (!c)
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return false;
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/* check for radar flags */
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if ((prohibited_flags & c->flags & IEEE80211_CHAN_RADAR) &&
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(c->dfs_state != NL80211_DFS_AVAILABLE))
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return false;
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/* check for the other flags */
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if (c->flags & prohibited_flags & ~IEEE80211_CHAN_RADAR)
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return false;
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}
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return true;
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}
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bool cfg80211_chandef_usable(struct wiphy *wiphy,
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const struct cfg80211_chan_def *chandef,
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u32 prohibited_flags)
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{
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struct ieee80211_sta_ht_cap *ht_cap;
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struct ieee80211_sta_vht_cap *vht_cap;
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u32 width, control_freq;
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if (WARN_ON(!cfg80211_chandef_valid(chandef)))
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return false;
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ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
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vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
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control_freq = chandef->chan->center_freq;
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switch (chandef->width) {
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case NL80211_CHAN_WIDTH_5:
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width = 5;
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break;
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case NL80211_CHAN_WIDTH_10:
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width = 10;
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break;
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case NL80211_CHAN_WIDTH_20:
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if (!ht_cap->ht_supported)
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return false;
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case NL80211_CHAN_WIDTH_20_NOHT:
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width = 20;
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break;
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case NL80211_CHAN_WIDTH_40:
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width = 40;
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if (!ht_cap->ht_supported)
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return false;
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if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
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ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
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return false;
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if (chandef->center_freq1 < control_freq &&
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chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
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return false;
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if (chandef->center_freq1 > control_freq &&
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chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
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return false;
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break;
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case NL80211_CHAN_WIDTH_80P80:
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if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))
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return false;
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case NL80211_CHAN_WIDTH_80:
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if (!vht_cap->vht_supported)
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return false;
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prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
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width = 80;
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break;
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case NL80211_CHAN_WIDTH_160:
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if (!vht_cap->vht_supported)
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return false;
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if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ))
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return false;
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prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
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width = 160;
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break;
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default:
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WARN_ON_ONCE(1);
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return false;
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}
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/*
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* TODO: What if there are only certain 80/160/80+80 MHz channels
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* allowed by the driver, or only certain combinations?
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* For 40 MHz the driver can set the NO_HT40 flags, but for
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* 80/160 MHz and in particular 80+80 MHz this isn't really
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* feasible and we only have NO_80MHZ/NO_160MHZ so far but
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* no way to cover 80+80 MHz or more complex restrictions.
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* Note that such restrictions also need to be advertised to
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* userspace, for example for P2P channel selection.
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*/
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if (width > 20)
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prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
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/* 5 and 10 MHz are only defined for the OFDM PHY */
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if (width < 20)
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prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
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if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1,
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width, prohibited_flags))
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return false;
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if (!chandef->center_freq2)
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return true;
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return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2,
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width, prohibited_flags);
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}
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EXPORT_SYMBOL(cfg80211_chandef_usable);
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bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
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struct cfg80211_chan_def *chandef)
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{
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bool res;
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trace_cfg80211_reg_can_beacon(wiphy, chandef);
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res = cfg80211_chandef_usable(wiphy, chandef,
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IEEE80211_CHAN_DISABLED |
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IEEE80211_CHAN_PASSIVE_SCAN |
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IEEE80211_CHAN_NO_IBSS |
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IEEE80211_CHAN_RADAR);
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trace_cfg80211_return_bool(res);
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return res;
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}
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EXPORT_SYMBOL(cfg80211_reg_can_beacon);
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int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
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struct cfg80211_chan_def *chandef)
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{
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if (!rdev->ops->set_monitor_channel)
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return -EOPNOTSUPP;
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if (!cfg80211_has_monitors_only(rdev))
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return -EBUSY;
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return rdev_set_monitor_channel(rdev, chandef);
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}
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void
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cfg80211_get_chan_state(struct wireless_dev *wdev,
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struct ieee80211_channel **chan,
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enum cfg80211_chan_mode *chanmode)
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{
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*chan = NULL;
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*chanmode = CHAN_MODE_UNDEFINED;
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ASSERT_WDEV_LOCK(wdev);
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if (wdev->netdev && !netif_running(wdev->netdev))
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return;
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switch (wdev->iftype) {
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case NL80211_IFTYPE_ADHOC:
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if (wdev->current_bss) {
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*chan = wdev->current_bss->pub.channel;
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*chanmode = (wdev->ibss_fixed &&
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!wdev->ibss_dfs_possible)
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? CHAN_MODE_SHARED
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: CHAN_MODE_EXCLUSIVE;
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return;
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}
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case NL80211_IFTYPE_STATION:
|
|
case NL80211_IFTYPE_P2P_CLIENT:
|
|
if (wdev->current_bss) {
|
|
*chan = wdev->current_bss->pub.channel;
|
|
*chanmode = CHAN_MODE_SHARED;
|
|
return;
|
|
}
|
|
break;
|
|
case NL80211_IFTYPE_AP:
|
|
case NL80211_IFTYPE_P2P_GO:
|
|
if (wdev->cac_started) {
|
|
*chan = wdev->channel;
|
|
*chanmode = CHAN_MODE_SHARED;
|
|
} else if (wdev->beacon_interval) {
|
|
*chan = wdev->channel;
|
|
*chanmode = CHAN_MODE_SHARED;
|
|
}
|
|
return;
|
|
case NL80211_IFTYPE_MESH_POINT:
|
|
if (wdev->mesh_id_len) {
|
|
*chan = wdev->channel;
|
|
*chanmode = CHAN_MODE_SHARED;
|
|
}
|
|
return;
|
|
case NL80211_IFTYPE_MONITOR:
|
|
case NL80211_IFTYPE_AP_VLAN:
|
|
case NL80211_IFTYPE_WDS:
|
|
/* these interface types don't really have a channel */
|
|
return;
|
|
case NL80211_IFTYPE_P2P_DEVICE:
|
|
if (wdev->wiphy->features &
|
|
NL80211_FEATURE_P2P_DEVICE_NEEDS_CHANNEL)
|
|
*chanmode = CHAN_MODE_EXCLUSIVE;
|
|
return;
|
|
case NL80211_IFTYPE_UNSPECIFIED:
|
|
case NUM_NL80211_IFTYPES:
|
|
WARN_ON(1);
|
|
}
|
|
|
|
return;
|
|
}
|