6b9c86466c
The flags that indicate that a channel is allowed for 80/160 MHz use are divided according to the position of the control channel (e.g., HOSTAPD_CHAN_VHT_10_70, HOSTAPD_CHAN_VHT_30_50, etc.). However, the position of the control channel does not add any extra regulatory information because when trying to use a 80/160 MHz channel all the desired bandwidth has to be allowed for 80/160 MHz use, regardless of the control channel position. In addition, these flags are set only if the driver reports one regulatory rule that allows the entire 80/160 MHz bandwidth. However, even when a 80/160 MHz channel is allowed, in some cases the bandwidth will be split into several regulatory rules because different segments of the bandwidth differ in other flags (that don't affect the use of the bandwidth for VHT channels). So, in such cases these flags will not be set, although VHT channels are allowed. As the result, VHT channels will not be used although they are allowed by the regulatory domain. Fix this by introducing new flags that indicate if a 2 0MHz channel is allowed to be used as a part of a wider (80/160 MHz) channel. The new flags are set for each 20 MHz channel independently and thus will be set even if the regulatory rules for the bandwidth are split. A 80/160 MHz channel is allowed if all its 20 MHz sub-channels are allowed for 80/160 MHz usage. Signed-off-by: Avraham Stern <avraham.stern@intel.com> Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
526 lines
13 KiB
C
526 lines
13 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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#include "bss.h"
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static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode,
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u8 op_class, u8 chan,
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unsigned int *flags)
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{
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int i;
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bool is_6ghz = op_class >= 131 && op_class <= 136;
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for (i = 0; i < mode->num_channels; i++) {
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bool chan_is_6ghz;
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chan_is_6ghz = mode->channels[i].freq >= 5935 &&
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mode->channels[i].freq <= 7115;
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if (is_6ghz == chan_is_6ghz && 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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if (mode->channels[i].flag & HOSTAPD_CHAN_NO_IR)
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return NO_IR;
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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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const u8 *center_channels, size_t num_chan)
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{
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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 < num_chan; 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,
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u8 op_class, u8 channel)
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{
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u8 center_chan;
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unsigned int i;
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unsigned int no_ir = 0;
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const u8 *center_channels;
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size_t num_chan;
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const u8 center_channels_5ghz[] = { 42, 58, 106, 122, 138, 155, 171 };
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const u8 center_channels_6ghz[] = { 7, 23, 39, 55, 71, 87, 103, 119,
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135, 151, 167, 183, 199, 215 };
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if (is_6ghz_op_class(op_class)) {
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center_channels = center_channels_6ghz;
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num_chan = ARRAY_SIZE(center_channels_6ghz);
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} else {
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center_channels = center_channels_5ghz;
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num_chan = ARRAY_SIZE(center_channels_5ghz);
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}
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center_chan = get_center_80mhz(mode, channel, center_channels,
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num_chan);
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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, op_class, adj_chan, &flags) ==
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NOT_ALLOWED)
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return NOT_ALLOWED;
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if (!(flags & HOSTAPD_CHAN_VHT_80MHZ_SUBCHANNEL))
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return NOT_ALLOWED;
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if (flags & HOSTAPD_CHAN_NO_IR)
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no_ir = 1;
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}
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if (no_ir)
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return NO_IR;
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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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const u8 *center_channels, size_t num_chan)
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{
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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 < num_chan; 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 op_class, u8 channel)
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{
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u8 center_chan;
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unsigned int i;
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unsigned int no_ir = 0;
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const u8 *center_channels;
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size_t num_chan;
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const u8 center_channels_5ghz[] = { 50, 114, 163 };
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const u8 center_channels_6ghz[] = { 15, 47, 79, 111, 143, 175, 207 };
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if (is_6ghz_op_class(op_class)) {
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center_channels = center_channels_6ghz;
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num_chan = ARRAY_SIZE(center_channels_6ghz);
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} else {
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center_channels = center_channels_5ghz;
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num_chan = ARRAY_SIZE(center_channels_5ghz);
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}
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center_chan = get_center_160mhz(mode, channel, center_channels,
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num_chan);
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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, op_class, adj_chan, &flags) ==
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NOT_ALLOWED)
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return NOT_ALLOWED;
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if (!(flags & HOSTAPD_CHAN_VHT_80MHZ_SUBCHANNEL) ||
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!(flags & HOSTAPD_CHAN_VHT_160MHZ_SUBCHANNEL))
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return NOT_ALLOWED;
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if (flags & HOSTAPD_CHAN_NO_IR)
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no_ir = 1;
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}
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if (no_ir)
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return NO_IR;
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return ALLOWED;
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}
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enum chan_allowed verify_channel(struct hostapd_hw_modes *mode, u8 op_class,
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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, op_class, channel, &flag);
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if (bw == BW40MINUS || (bw == BW40 && (((channel - 1) / 4) % 2))) {
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if (!(flag & HOSTAPD_CHAN_HT40MINUS))
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return NOT_ALLOWED;
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res2 = allow_channel(mode, op_class, 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, op_class, channel + 4, NULL);
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} else if (is_6ghz_op_class(op_class) && bw == BW40) {
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if (get_6ghz_sec_channel(channel) < 0)
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res2 = allow_channel(mode, op_class, channel - 4, NULL);
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else
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res2 = allow_channel(mode, op_class, 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, op_class, 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, op_class, 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, op_class, 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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if (res == NO_IR || res2 == NO_IR)
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return NO_IR;
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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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struct wpa_ssid *ssid,
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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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int z;
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int freq2 = 0;
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int freq5 = 0;
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mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op_class->mode,
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is_6ghz_op_class(op_class->op_class));
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if (!mode)
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return 0;
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/* If we are configured to disable certain things, take that into
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* account here. */
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if (ssid && ssid->freq_list && ssid->freq_list[0]) {
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for (z = 0; ; z++) {
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int f = ssid->freq_list[z];
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if (f == 0)
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break; /* end of list */
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if (f > 4000 && f < 6000)
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freq5 = 1;
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else if (f > 2400 && f < 2500)
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freq2 = 1;
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}
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} else {
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/* No frequencies specified, can use anything hardware supports.
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*/
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freq2 = freq5 = 1;
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}
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if (op_class->op_class >= 115 && op_class->op_class <= 130 && !freq5)
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return 0;
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if (op_class->op_class >= 81 && op_class->op_class <= 84 && !freq2)
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return 0;
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#ifdef CONFIG_HT_OVERRIDES
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if (ssid && ssid->disable_ht) {
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switch (op_class->op_class) {
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case 83:
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case 84:
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case 104:
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case 105:
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case 116:
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case 117:
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case 119:
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case 120:
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case 122:
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case 123:
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case 126:
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case 127:
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case 128:
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case 129:
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case 130:
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/* Disable >= 40 MHz channels if HT is disabled */
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return 0;
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}
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}
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#endif /* CONFIG_HT_OVERRIDES */
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#ifdef CONFIG_VHT_OVERRIDES
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if (ssid && ssid->disable_vht) {
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if (op_class->op_class >= 128 && op_class->op_class <= 130) {
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/* Disable >= 80 MHz channels if VHT is disabled */
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return 0;
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}
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}
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#endif /* CONFIG_VHT_OVERRIDES */
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if (op_class->op_class == 128) {
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u8 channels[] = { 42, 58, 106, 122, 138, 155, 171 };
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for (i = 0; i < ARRAY_SIZE(channels); i++) {
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if (verify_channel(mode, op_class->op_class,
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channels[i], op_class->bw) !=
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NOT_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, op_class->op_class, 50,
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op_class->bw) != NOT_ALLOWED ||
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verify_channel(mode, op_class->op_class, 114,
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op_class->bw) != NOT_ALLOWED ||
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verify_channel(mode, op_class->op_class, 163,
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op_class->bw) != NOT_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, op_class->op_class, 42,
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op_class->bw) != NOT_ALLOWED ||
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verify_channel(mode, op_class->op_class, 58,
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op_class->bw) != NOT_ALLOWED)
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found++;
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if (verify_channel(mode, op_class->op_class, 106,
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op_class->bw) != NOT_ALLOWED ||
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verify_channel(mode, op_class->op_class, 122,
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op_class->bw) != NOT_ALLOWED ||
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verify_channel(mode, op_class->op_class, 138,
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op_class->bw) != NOT_ALLOWED ||
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verify_channel(mode, op_class->op_class, 155,
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op_class->bw) != NOT_ALLOWED ||
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verify_channel(mode, op_class->op_class, 171,
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op_class->bw) != NOT_ALLOWED)
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found++;
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if (verify_channel(mode, op_class->op_class, 106,
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op_class->bw) != NOT_ALLOWED &&
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verify_channel(mode, op_class->op_class, 138,
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op_class->bw) != NOT_ALLOWED)
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found++;
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if (verify_channel(mode, op_class->op_class, 122,
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op_class->bw) != NOT_ALLOWED &&
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verify_channel(mode, op_class->op_class, 155,
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op_class->bw) != NOT_ALLOWED)
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found++;
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if (verify_channel(mode, op_class->op_class, 138,
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op_class->bw) != NOT_ALLOWED &&
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verify_channel(mode, op_class->op_class, 171,
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op_class->bw) != NOT_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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if (op_class->op_class == 135) {
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/* Need at least two 80 MHz segments which do not fall under the
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* same 160 MHz segment to support 80+80 in 6 GHz.
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*/
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int first_seg = 0;
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int curr_seg = 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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curr_seg++;
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if (verify_channel(mode, op_class->op_class, chan,
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op_class->bw) != NOT_ALLOWED) {
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if (!first_seg) {
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first_seg = curr_seg;
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continue;
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}
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/* Supported if at least two non-consecutive 80
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* MHz segments allowed.
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*/
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if ((curr_seg - first_seg) > 1)
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return 1;
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/* Supported even if the 80 MHz segments are
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* consecutive when they do not fall under the
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* same 160 MHz segment.
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*/
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if ((first_seg % 2) == 0)
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return 1;
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}
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}
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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, op_class->op_class, chan,
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op_class->bw) != NOT_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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static int wpas_sta_secondary_channel_offset(struct wpa_bss *bss, u8 *current,
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u8 *channel)
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{
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const u8 *ies;
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u8 phy_type;
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size_t ies_len;
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if (!bss)
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return -1;
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ies = wpa_bss_ie_ptr(bss);
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ies_len = bss->ie_len ? bss->ie_len : bss->beacon_ie_len;
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return wpas_get_op_chan_phy(bss->freq, ies, ies_len, current,
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channel, &phy_type);
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}
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size_t wpas_supp_op_class_ie(struct wpa_supplicant *wpa_s,
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struct wpa_ssid *ssid,
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struct wpa_bss *bss, u8 *pos, 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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* Determine the current operating class correct mode based on
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* advertised BSS capabilities, if available. Fall back to a less
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* accurate guess based on frequency if the needed IEs are not available
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* or used.
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*/
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if (wpas_sta_secondary_channel_offset(bss, ¤t, &chan) < 0 &&
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ieee80211_freq_to_channel_ext(bss->freq, 0,
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CONF_OPER_CHWIDTH_USE_HT, ¤t,
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&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, ssid, &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) {
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wpa_printf(MSG_DEBUG,
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"No supported operating classes IE to add");
|
|
res = 0;
|
|
} else if (wpabuf_len(buf) > len) {
|
|
wpa_printf(MSG_ERROR,
|
|
"Supported operating classes IE exceeds maximum buffer length");
|
|
res = 0;
|
|
} else {
|
|
os_memcpy(pos, wpabuf_head(buf), wpabuf_len(buf));
|
|
res = wpabuf_len(buf);
|
|
wpa_hexdump_buf(MSG_DEBUG,
|
|
"Added supported operating classes IE", buf);
|
|
}
|
|
|
|
wpabuf_free(buf);
|
|
return res;
|
|
}
|
|
|
|
|
|
int * wpas_supp_op_classes(struct wpa_supplicant *wpa_s)
|
|
{
|
|
int op;
|
|
unsigned int pos, max_num = 0;
|
|
int *classes;
|
|
|
|
for (op = 0; global_op_class[op].op_class; op++)
|
|
max_num++;
|
|
classes = os_zalloc((max_num + 1) * sizeof(int));
|
|
if (!classes)
|
|
return NULL;
|
|
|
|
for (op = 0, pos = 0; global_op_class[op].op_class; op++) {
|
|
if (wpas_op_class_supported(wpa_s, NULL, &global_op_class[op]))
|
|
classes[pos++] = global_op_class[op].op_class;
|
|
}
|
|
|
|
return classes;
|
|
}
|