065c029a55
Supported Operating Classes element and its use is define in the IEEE 802.11 standard and can be sent even when MBO is disabled in the build. As such, move this functionality out from the CONFIG_MBO=y only mbo.c. Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
310 lines
7.7 KiB
C
310 lines
7.7 KiB
C
/*
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* Operating classes
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* Copyright(c) 2015 Intel Deutschland GmbH
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "common/ieee802_11_common.h"
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#include "wpa_supplicant_i.h"
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enum chan_allowed {
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NOT_ALLOWED, ALLOWED
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};
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static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode, u8 chan,
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unsigned int *flags)
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{
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int i;
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for (i = 0; i < mode->num_channels; i++) {
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if (mode->channels[i].chan == chan)
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break;
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}
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if (i == mode->num_channels ||
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(mode->channels[i].flag & HOSTAPD_CHAN_DISABLED))
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return NOT_ALLOWED;
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if (flags)
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*flags = mode->channels[i].flag;
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return ALLOWED;
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}
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static int get_center_80mhz(struct hostapd_hw_modes *mode, u8 channel)
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{
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u8 center_channels[] = { 42, 58, 106, 122, 138, 155 };
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size_t i;
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if (mode->mode != HOSTAPD_MODE_IEEE80211A)
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return 0;
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for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
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/*
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* In 80 MHz, the bandwidth "spans" 12 channels (e.g., 36-48),
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* so the center channel is 6 channels away from the start/end.
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*/
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if (channel >= center_channels[i] - 6 &&
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channel <= center_channels[i] + 6)
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return center_channels[i];
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}
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return 0;
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}
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static enum chan_allowed verify_80mhz(struct hostapd_hw_modes *mode, u8 channel)
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{
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u8 center_chan;
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unsigned int i;
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center_chan = get_center_80mhz(mode, channel);
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if (!center_chan)
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return NOT_ALLOWED;
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/* check all the channels are available */
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for (i = 0; i < 4; i++) {
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unsigned int flags;
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u8 adj_chan = center_chan - 6 + i * 4;
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if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
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return NOT_ALLOWED;
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if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_70)) ||
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(i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_50)) ||
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(i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_30)) ||
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(i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_10)))
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return NOT_ALLOWED;
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}
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return ALLOWED;
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}
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static int get_center_160mhz(struct hostapd_hw_modes *mode, u8 channel)
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{
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u8 center_channels[] = { 50, 114 };
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unsigned int i;
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if (mode->mode != HOSTAPD_MODE_IEEE80211A)
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return 0;
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for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
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/*
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* In 160 MHz, the bandwidth "spans" 28 channels (e.g., 36-64),
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* so the center channel is 14 channels away from the start/end.
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*/
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if (channel >= center_channels[i] - 14 &&
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channel <= center_channels[i] + 14)
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return center_channels[i];
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}
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return 0;
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}
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static enum chan_allowed verify_160mhz(struct hostapd_hw_modes *mode,
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u8 channel)
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{
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u8 center_chan;
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unsigned int i;
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center_chan = get_center_160mhz(mode, channel);
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if (!center_chan)
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return NOT_ALLOWED;
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/* Check all the channels are available */
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for (i = 0; i < 8; i++) {
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unsigned int flags;
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u8 adj_chan = center_chan - 14 + i * 4;
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if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
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return NOT_ALLOWED;
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if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_150)) ||
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(i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_130)) ||
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(i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_110)) ||
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(i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_90)) ||
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(i == 4 && !(flags & HOSTAPD_CHAN_VHT_90_70)) ||
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(i == 5 && !(flags & HOSTAPD_CHAN_VHT_110_50)) ||
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(i == 6 && !(flags & HOSTAPD_CHAN_VHT_130_30)) ||
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(i == 7 && !(flags & HOSTAPD_CHAN_VHT_150_10)))
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return NOT_ALLOWED;
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}
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return ALLOWED;
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}
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static enum chan_allowed verify_channel(struct hostapd_hw_modes *mode,
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u8 channel, u8 bw)
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{
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unsigned int flag = 0;
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enum chan_allowed res, res2;
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res2 = res = allow_channel(mode, channel, &flag);
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if (bw == BW40MINUS) {
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if (!(flag & HOSTAPD_CHAN_HT40MINUS))
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return NOT_ALLOWED;
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res2 = allow_channel(mode, channel - 4, NULL);
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} else if (bw == BW40PLUS) {
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if (!(flag & HOSTAPD_CHAN_HT40PLUS))
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return NOT_ALLOWED;
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res2 = allow_channel(mode, channel + 4, NULL);
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} else if (bw == BW80) {
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/*
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* channel is a center channel and as such, not necessarily a
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* valid 20 MHz channels. Override earlier allow_channel()
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* result and use only the 80 MHz specific version.
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*/
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res2 = res = verify_80mhz(mode, channel);
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} else if (bw == BW160) {
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/*
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* channel is a center channel and as such, not necessarily a
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* valid 20 MHz channels. Override earlier allow_channel()
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* result and use only the 160 MHz specific version.
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*/
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res2 = res = verify_160mhz(mode, channel);
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} else if (bw == BW80P80) {
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/*
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* channel is a center channel and as such, not necessarily a
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* valid 20 MHz channels. Override earlier allow_channel()
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* result and use only the 80 MHz specific version.
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*/
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res2 = res = verify_80mhz(mode, channel);
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}
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if (res == NOT_ALLOWED || res2 == NOT_ALLOWED)
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return NOT_ALLOWED;
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return ALLOWED;
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}
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static int wpas_op_class_supported(struct wpa_supplicant *wpa_s,
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const struct oper_class_map *op_class)
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{
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int chan;
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size_t i;
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struct hostapd_hw_modes *mode;
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int found;
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mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op_class->mode);
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if (!mode)
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return 0;
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if (op_class->op_class == 128) {
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u8 channels[] = { 42, 58, 106, 122, 138, 155 };
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for (i = 0; i < ARRAY_SIZE(channels); i++) {
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if (verify_channel(mode, channels[i], op_class->bw) ==
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ALLOWED)
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return 1;
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}
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return 0;
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}
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if (op_class->op_class == 129) {
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/* Check if either 160 MHz channels is allowed */
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return verify_channel(mode, 50, op_class->bw) == ALLOWED ||
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verify_channel(mode, 114, op_class->bw) == ALLOWED;
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}
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if (op_class->op_class == 130) {
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/* Need at least two non-contiguous 80 MHz segments */
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found = 0;
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if (verify_channel(mode, 42, op_class->bw) == ALLOWED ||
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verify_channel(mode, 58, op_class->bw) == ALLOWED)
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found++;
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if (verify_channel(mode, 106, op_class->bw) == ALLOWED ||
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verify_channel(mode, 122, op_class->bw) == ALLOWED ||
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verify_channel(mode, 138, op_class->bw) == ALLOWED)
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found++;
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if (verify_channel(mode, 106, op_class->bw) == ALLOWED &&
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verify_channel(mode, 138, op_class->bw) == ALLOWED)
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found++;
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if (verify_channel(mode, 155, op_class->bw) == ALLOWED)
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found++;
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if (found >= 2)
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return 1;
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return 0;
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}
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found = 0;
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for (chan = op_class->min_chan; chan <= op_class->max_chan;
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chan += op_class->inc) {
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if (verify_channel(mode, chan, op_class->bw) == ALLOWED) {
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found = 1;
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break;
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}
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}
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return found;
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}
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size_t wpas_supp_op_class_ie(struct wpa_supplicant *wpa_s, int freq, u8 *pos,
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size_t len)
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{
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struct wpabuf *buf;
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u8 op, current, chan;
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u8 *ie_len;
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size_t res;
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/*
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* Assume 20 MHz channel for now.
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* TODO: Use the secondary channel and VHT channel width that will be
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* used after association.
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*/
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if (ieee80211_freq_to_channel_ext(freq, 0, VHT_CHANWIDTH_USE_HT,
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¤t, &chan) == NUM_HOSTAPD_MODES)
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return 0;
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/*
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* Need 3 bytes for EID, length, and current operating class, plus
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* 1 byte for every other supported operating class.
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*/
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buf = wpabuf_alloc(global_op_class_size + 3);
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if (!buf)
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return 0;
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wpabuf_put_u8(buf, WLAN_EID_SUPPORTED_OPERATING_CLASSES);
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/* Will set the length later, putting a placeholder */
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ie_len = wpabuf_put(buf, 1);
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wpabuf_put_u8(buf, current);
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for (op = 0; global_op_class[op].op_class; op++) {
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if (wpas_op_class_supported(wpa_s, &global_op_class[op]))
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wpabuf_put_u8(buf, global_op_class[op].op_class);
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}
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*ie_len = wpabuf_len(buf) - 2;
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if (*ie_len < 2 || wpabuf_len(buf) > len) {
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wpa_printf(MSG_ERROR,
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"Failed to add supported operating classes IE");
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res = 0;
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} else {
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os_memcpy(pos, wpabuf_head(buf), wpabuf_len(buf));
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res = wpabuf_len(buf);
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wpa_hexdump_buf(MSG_DEBUG,
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"Added supported operating classes IE", buf);
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}
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wpabuf_free(buf);
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return res;
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}
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