--- /dev/null
+/*
+ * Common hostapd/wpa_supplicant HW features
+ * Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2015, Qualcomm Atheros, Inc.
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "defs.h"
+#include "ieee802_11_defs.h"
+#include "ieee802_11_common.h"
+#include "hw_features_common.h"
+
+
+struct hostapd_channel_data * hw_get_channel_chan(struct hostapd_hw_modes *mode,
+ int chan, int *freq)
+{
+ int i;
+
+ if (freq)
+ *freq = 0;
+
+ if (!mode)
+ return NULL;
+
+ for (i = 0; i < mode->num_channels; i++) {
+ struct hostapd_channel_data *ch = &mode->channels[i];
+ if (ch->chan == chan) {
+ if (freq)
+ *freq = ch->freq;
+ return ch;
+ }
+ }
+
+ return NULL;
+}
+
+
+struct hostapd_channel_data * hw_get_channel_freq(struct hostapd_hw_modes *mode,
+ int freq, int *chan)
+{
+ int i;
+
+ if (chan)
+ *chan = 0;
+
+ if (!mode)
+ return NULL;
+
+ for (i = 0; i < mode->num_channels; i++) {
+ struct hostapd_channel_data *ch = &mode->channels[i];
+ if (ch->freq == freq) {
+ if (chan)
+ *chan = ch->chan;
+ return ch;
+ }
+ }
+
+ return NULL;
+}
+
+
+int hw_get_freq(struct hostapd_hw_modes *mode, int chan)
+{
+ int freq;
+
+ hw_get_channel_chan(mode, chan, &freq);
+
+ return freq;
+}
+
+
+int hw_get_chan(struct hostapd_hw_modes *mode, int freq)
+{
+ int chan;
+
+ hw_get_channel_freq(mode, freq, &chan);
+
+ return chan;
+}
+
+
+int allowed_ht40_channel_pair(struct hostapd_hw_modes *mode, int pri_chan,
+ int sec_chan)
+{
+ int ok, j, first;
+ int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 140,
+ 149, 157, 184, 192 };
+ size_t k;
+
+ if (pri_chan == sec_chan || !sec_chan)
+ return 1; /* HT40 not used */
+
+ wpa_printf(MSG_DEBUG,
+ "HT40: control channel: %d secondary channel: %d",
+ pri_chan, sec_chan);
+
+ /* Verify that HT40 secondary channel is an allowed 20 MHz
+ * channel */
+ ok = 0;
+ for (j = 0; j < mode->num_channels; j++) {
+ struct hostapd_channel_data *chan = &mode->channels[j];
+ if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
+ chan->chan == sec_chan) {
+ ok = 1;
+ break;
+ }
+ }
+ if (!ok) {
+ wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed",
+ sec_chan);
+ return 0;
+ }
+
+ /*
+ * Verify that HT40 primary,secondary channel pair is allowed per
+ * IEEE 802.11n Annex J. This is only needed for 5 GHz band since
+ * 2.4 GHz rules allow all cases where the secondary channel fits into
+ * the list of allowed channels (already checked above).
+ */
+ if (mode->mode != HOSTAPD_MODE_IEEE80211A)
+ return 1;
+
+ first = pri_chan < sec_chan ? pri_chan : sec_chan;
+
+ ok = 0;
+ for (k = 0; k < ARRAY_SIZE(allowed); k++) {
+ if (first == allowed[k]) {
+ ok = 1;
+ break;
+ }
+ }
+ if (!ok) {
+ wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed",
+ pri_chan, sec_chan);
+ return 0;
+ }
+
+ return 1;
+}
+
+
+void get_pri_sec_chan(struct wpa_scan_res *bss, int *pri_chan, int *sec_chan)
+{
+ struct ieee80211_ht_operation *oper;
+ struct ieee802_11_elems elems;
+
+ *pri_chan = *sec_chan = 0;
+
+ ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
+ if (elems.ht_operation) {
+ oper = (struct ieee80211_ht_operation *) elems.ht_operation;
+ *pri_chan = oper->primary_chan;
+ if (oper->ht_param & HT_INFO_HT_PARAM_STA_CHNL_WIDTH) {
+ int sec = oper->ht_param &
+ HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK;
+ if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
+ *sec_chan = *pri_chan + 4;
+ else if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
+ *sec_chan = *pri_chan - 4;
+ }
+ }
+}
+
+
+int check_40mhz_5g(struct hostapd_hw_modes *mode,
+ struct wpa_scan_results *scan_res, int pri_chan,
+ int sec_chan)
+{
+ int pri_freq, sec_freq, pri_bss, sec_bss;
+ int bss_pri_chan, bss_sec_chan;
+ size_t i;
+ int match;
+
+ if (!mode || !scan_res || !pri_chan || !sec_chan ||
+ pri_chan == sec_chan)
+ return 0;
+
+ pri_freq = hw_get_freq(mode, pri_chan);
+ sec_freq = hw_get_freq(mode, sec_chan);
+
+ /*
+ * Switch PRI/SEC channels if Beacons were detected on selected SEC
+ * channel, but not on selected PRI channel.
+ */
+ pri_bss = sec_bss = 0;
+ for (i = 0; i < scan_res->num; i++) {
+ struct wpa_scan_res *bss = scan_res->res[i];
+ if (bss->freq == pri_freq)
+ pri_bss++;
+ else if (bss->freq == sec_freq)
+ sec_bss++;
+ }
+ if (sec_bss && !pri_bss) {
+ wpa_printf(MSG_INFO,
+ "Switch own primary and secondary channel to get secondary channel with no Beacons from other BSSes");
+ return 2;
+ }
+
+ /*
+ * Match PRI/SEC channel with any existing HT40 BSS on the same
+ * channels that we are about to use (if already mixed order in
+ * existing BSSes, use own preference).
+ */
+ match = 0;
+ for (i = 0; i < scan_res->num; i++) {
+ struct wpa_scan_res *bss = scan_res->res[i];
+ get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
+ if (pri_chan == bss_pri_chan &&
+ sec_chan == bss_sec_chan) {
+ match = 1;
+ break;
+ }
+ }
+ if (!match) {
+ for (i = 0; i < scan_res->num; i++) {
+ struct wpa_scan_res *bss = scan_res->res[i];
+ get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
+ if (pri_chan == bss_sec_chan &&
+ sec_chan == bss_pri_chan) {
+ wpa_printf(MSG_INFO, "Switch own primary and "
+ "secondary channel due to BSS "
+ "overlap with " MACSTR,
+ MAC2STR(bss->bssid));
+ return 2;
+ }
+ }
+ }
+
+ return 1;
+}
+
+
+static int check_20mhz_bss(struct wpa_scan_res *bss, int pri_freq, int start,
+ int end)
+{
+ struct ieee802_11_elems elems;
+ struct ieee80211_ht_operation *oper;
+
+ if (bss->freq < start || bss->freq > end || bss->freq == pri_freq)
+ return 0;
+
+ ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
+ if (!elems.ht_capabilities) {
+ wpa_printf(MSG_DEBUG, "Found overlapping legacy BSS: "
+ MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
+ return 1;
+ }
+
+ if (elems.ht_operation) {
+ oper = (struct ieee80211_ht_operation *) elems.ht_operation;
+ if (oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)
+ return 0;
+
+ wpa_printf(MSG_DEBUG, "Found overlapping 20 MHz HT BSS: "
+ MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
+ return 1;
+ }
+ return 0;
+}
+
+
+int check_40mhz_2g4(struct hostapd_hw_modes *mode,
+ struct wpa_scan_results *scan_res, int pri_chan,
+ int sec_chan)
+{
+ int pri_freq, sec_freq;
+ int affected_start, affected_end;
+ size_t i;
+
+ if (!mode || !scan_res || !pri_chan || !sec_chan ||
+ pri_chan == sec_chan)
+ return 0;
+
+ pri_freq = hw_get_freq(mode, pri_chan);
+ sec_freq = hw_get_freq(mode, sec_chan);
+
+ affected_start = (pri_freq + sec_freq) / 2 - 25;
+ affected_end = (pri_freq + sec_freq) / 2 + 25;
+ wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
+ affected_start, affected_end);
+ for (i = 0; i < scan_res->num; i++) {
+ struct wpa_scan_res *bss = scan_res->res[i];
+ int pri = bss->freq;
+ int sec = pri;
+ struct ieee802_11_elems elems;
+
+ /* Check for overlapping 20 MHz BSS */
+ if (check_20mhz_bss(bss, pri_freq, affected_start,
+ affected_end)) {
+ wpa_printf(MSG_DEBUG,
+ "Overlapping 20 MHz BSS is found");
+ return 0;
+ }
+
+ get_pri_sec_chan(bss, &pri_chan, &sec_chan);
+
+ if (sec_chan) {
+ if (sec_chan < pri_chan)
+ sec = pri - 20;
+ else
+ sec = pri + 20;
+ }
+
+ if ((pri < affected_start || pri > affected_end) &&
+ (sec < affected_start || sec > affected_end))
+ continue; /* not within affected channel range */
+
+ wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
+ " freq=%d pri=%d sec=%d",
+ MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);
+
+ if (sec_chan) {
+ if (pri_freq != pri || sec_freq != sec) {
+ wpa_printf(MSG_DEBUG,
+ "40 MHz pri/sec mismatch with BSS "
+ MACSTR
+ " <%d,%d> (chan=%d%c) vs. <%d,%d>",
+ MAC2STR(bss->bssid),
+ pri, sec, pri_chan,
+ sec > pri ? '+' : '-',
+ pri_freq, sec_freq);
+ return 0;
+ }
+ }
+
+ ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems,
+ 0);
+ if (elems.ht_capabilities) {
+ struct ieee80211_ht_capabilities *ht_cap =
+ (struct ieee80211_ht_capabilities *)
+ elems.ht_capabilities;
+
+ if (le_to_host16(ht_cap->ht_capabilities_info) &
+ HT_CAP_INFO_40MHZ_INTOLERANT) {
+ wpa_printf(MSG_DEBUG,
+ "40 MHz Intolerant is set on channel %d in BSS "
+ MACSTR, pri, MAC2STR(bss->bssid));
+ return 0;
+ }
+ }
+ }
+
+ return 1;
+}
+
+
+int hostapd_set_freq_params(struct hostapd_freq_params *data,
+ enum hostapd_hw_mode mode,
+ int freq, int channel, int ht_enabled,
+ int vht_enabled, int sec_channel_offset,
+ int vht_oper_chwidth, int center_segment0,
+ int center_segment1, u32 vht_caps)
+{
+ os_memset(data, 0, sizeof(*data));
+ data->mode = mode;
+ data->freq = freq;
+ data->channel = channel;
+ data->ht_enabled = ht_enabled;
+ data->vht_enabled = vht_enabled;
+ data->sec_channel_offset = sec_channel_offset;
+ data->center_freq1 = freq + sec_channel_offset * 10;
+ data->center_freq2 = 0;
+ data->bandwidth = sec_channel_offset ? 40 : 20;
+
+ if (data->vht_enabled) switch (vht_oper_chwidth) {
+ case VHT_CHANWIDTH_USE_HT:
+ if (center_segment1 ||
+ (center_segment0 != 0 &&
+ 5000 + center_segment0 * 5 != data->center_freq1 &&
+ 2407 + center_segment0 * 5 != data->center_freq1))
+ return -1;
+ break;
+ case VHT_CHANWIDTH_80P80MHZ:
+ if (!(vht_caps & VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)) {
+ wpa_printf(MSG_ERROR,
+ "80+80 channel width is not supported!");
+ return -1;
+ }
+ if (center_segment1 == center_segment0 + 4 ||
+ center_segment1 == center_segment0 - 4)
+ return -1;
+ data->center_freq2 = 5000 + center_segment1 * 5;
+ /* fall through */
+ case VHT_CHANWIDTH_80MHZ:
+ data->bandwidth = 80;
+ if ((vht_oper_chwidth == 1 && center_segment1) ||
+ (vht_oper_chwidth == 3 && !center_segment1) ||
+ !sec_channel_offset)
+ return -1;
+ if (!center_segment0) {
+ if (channel <= 48)
+ center_segment0 = 42;
+ else if (channel <= 64)
+ center_segment0 = 58;
+ else if (channel <= 112)
+ center_segment0 = 106;
+ else if (channel <= 128)
+ center_segment0 = 122;
+ else if (channel <= 144)
+ center_segment0 = 138;
+ else if (channel <= 161)
+ center_segment0 = 155;
+ data->center_freq1 = 5000 + center_segment0 * 5;
+ } else {
+ /*
+ * Note: HT/VHT config and params are coupled. Check if
+ * HT40 channel band is in VHT80 Pri channel band
+ * configuration.
+ */
+ if (center_segment0 == channel + 6 ||
+ center_segment0 == channel + 2 ||
+ center_segment0 == channel - 2 ||
+ center_segment0 == channel - 6)
+ data->center_freq1 = 5000 + center_segment0 * 5;
+ else
+ return -1;
+ }
+ break;
+ case VHT_CHANWIDTH_160MHZ:
+ data->bandwidth = 160;
+ if (!(vht_caps & (VHT_CAP_SUPP_CHAN_WIDTH_160MHZ |
+ VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))) {
+ wpa_printf(MSG_ERROR,
+ "160MHZ channel width is not supported!");
+ return -1;
+ }
+ if (center_segment1)
+ return -1;
+ if (!sec_channel_offset)
+ return -1;
+ /*
+ * Note: HT/VHT config and params are coupled. Check if
+ * HT40 channel band is in VHT160 channel band configuration.
+ */
+ if (center_segment0 == channel + 14 ||
+ center_segment0 == channel + 10 ||
+ center_segment0 == channel + 6 ||
+ center_segment0 == channel + 2 ||
+ center_segment0 == channel - 2 ||
+ center_segment0 == channel - 6 ||
+ center_segment0 == channel - 10 ||
+ center_segment0 == channel - 14)
+ data->center_freq1 = 5000 + center_segment0 * 5;
+ else
+ return -1;
+ break;
+ }
+
+ return 0;
+}
projects / mech_eap.git / blobdiff