hostap/wpa_supplicant/op_classes.c
Jouni Malinen be7ee264f6 BSS: Use wrapper function for getting a pointer to the IE buffer
This makes it easier to change the internal struct wpa_bss design for
storing the variable length IE buffers.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
2020-11-16 16:21:56 +02:00

517 lines
13 KiB
C

/*
* Operating classes
* Copyright(c) 2015 Intel Deutschland GmbH
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "common/ieee802_11_common.h"
#include "wpa_supplicant_i.h"
#include "bss.h"
static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode,
u8 op_class, u8 chan,
unsigned int *flags)
{
int i;
int is_6ghz = op_class >= 131 && op_class <= 136;
for (i = 0; i < mode->num_channels; i++) {
int chan_is_6ghz;
chan_is_6ghz = mode->channels[i].freq >= 5935 &&
mode->channels[i].freq <= 7115;
if (is_6ghz == chan_is_6ghz && mode->channels[i].chan == chan)
break;
}
if (i == mode->num_channels ||
(mode->channels[i].flag & HOSTAPD_CHAN_DISABLED))
return NOT_ALLOWED;
if (flags)
*flags = mode->channels[i].flag;
if (mode->channels[i].flag & HOSTAPD_CHAN_NO_IR)
return NO_IR;
return ALLOWED;
}
static int get_center_80mhz(struct hostapd_hw_modes *mode, u8 channel,
const u8 *center_channels, size_t num_chan)
{
size_t i;
if (mode->mode != HOSTAPD_MODE_IEEE80211A)
return 0;
for (i = 0; i < num_chan; i++) {
/*
* In 80 MHz, the bandwidth "spans" 12 channels (e.g., 36-48),
* so the center channel is 6 channels away from the start/end.
*/
if (channel >= center_channels[i] - 6 &&
channel <= center_channels[i] + 6)
return center_channels[i];
}
return 0;
}
static enum chan_allowed verify_80mhz(struct hostapd_hw_modes *mode,
u8 op_class, u8 channel)
{
u8 center_chan;
unsigned int i;
unsigned int no_ir = 0;
const u8 *center_channels;
size_t num_chan;
const u8 center_channels_5ghz[] = { 42, 58, 106, 122, 138, 155 };
const u8 center_channels_6ghz[] = { 7, 23, 39, 55, 71, 87, 103, 119,
135, 151, 167, 183, 199, 215 };
if (is_6ghz_op_class(op_class)) {
center_channels = center_channels_6ghz;
num_chan = ARRAY_SIZE(center_channels_6ghz);
} else {
center_channels = center_channels_5ghz;
num_chan = ARRAY_SIZE(center_channels_5ghz);
}
center_chan = get_center_80mhz(mode, channel, center_channels,
num_chan);
if (!center_chan)
return NOT_ALLOWED;
/* check all the channels are available */
for (i = 0; i < 4; i++) {
unsigned int flags;
u8 adj_chan = center_chan - 6 + i * 4;
if (allow_channel(mode, op_class, adj_chan, &flags) ==
NOT_ALLOWED)
return NOT_ALLOWED;
if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_70)) ||
(i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_50)) ||
(i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_30)) ||
(i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_10)))
return NOT_ALLOWED;
if (flags & HOSTAPD_CHAN_NO_IR)
no_ir = 1;
}
if (no_ir)
return NO_IR;
return ALLOWED;
}
static int get_center_160mhz(struct hostapd_hw_modes *mode, u8 channel,
const u8 *center_channels, size_t num_chan)
{
unsigned int i;
if (mode->mode != HOSTAPD_MODE_IEEE80211A)
return 0;
for (i = 0; i < num_chan; i++) {
/*
* In 160 MHz, the bandwidth "spans" 28 channels (e.g., 36-64),
* so the center channel is 14 channels away from the start/end.
*/
if (channel >= center_channels[i] - 14 &&
channel <= center_channels[i] + 14)
return center_channels[i];
}
return 0;
}
static enum chan_allowed verify_160mhz(struct hostapd_hw_modes *mode,
u8 op_class, u8 channel)
{
u8 center_chan;
unsigned int i;
unsigned int no_ir = 0;
const u8 *center_channels;
size_t num_chan;
const u8 center_channels_5ghz[] = { 50, 114 };
const u8 center_channels_6ghz[] = { 15, 47, 79, 111, 143, 175, 207 };
if (is_6ghz_op_class(op_class)) {
center_channels = center_channels_6ghz;
num_chan = ARRAY_SIZE(center_channels_6ghz);
} else {
center_channels = center_channels_5ghz;
num_chan = ARRAY_SIZE(center_channels_5ghz);
}
center_chan = get_center_160mhz(mode, channel, center_channels,
num_chan);
if (!center_chan)
return NOT_ALLOWED;
/* Check all the channels are available */
for (i = 0; i < 8; i++) {
unsigned int flags;
u8 adj_chan = center_chan - 14 + i * 4;
if (allow_channel(mode, op_class, adj_chan, &flags) ==
NOT_ALLOWED)
return NOT_ALLOWED;
if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_150)) ||
(i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_130)) ||
(i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_110)) ||
(i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_90)) ||
(i == 4 && !(flags & HOSTAPD_CHAN_VHT_90_70)) ||
(i == 5 && !(flags & HOSTAPD_CHAN_VHT_110_50)) ||
(i == 6 && !(flags & HOSTAPD_CHAN_VHT_130_30)) ||
(i == 7 && !(flags & HOSTAPD_CHAN_VHT_150_10)))
return NOT_ALLOWED;
if (flags & HOSTAPD_CHAN_NO_IR)
no_ir = 1;
}
if (no_ir)
return NO_IR;
return ALLOWED;
}
enum chan_allowed verify_channel(struct hostapd_hw_modes *mode, u8 op_class,
u8 channel, u8 bw)
{
unsigned int flag = 0;
enum chan_allowed res, res2;
res2 = res = allow_channel(mode, op_class, channel, &flag);
if (bw == BW40MINUS || (bw == BW40 && (((channel - 1) / 4) % 2))) {
if (!(flag & HOSTAPD_CHAN_HT40MINUS))
return NOT_ALLOWED;
res2 = allow_channel(mode, op_class, channel - 4, NULL);
} else if (bw == BW40PLUS ||
(bw == BW40 && !(((channel - 1) / 4) % 2))) {
if (!(flag & HOSTAPD_CHAN_HT40PLUS))
return NOT_ALLOWED;
res2 = allow_channel(mode, op_class, channel + 4, NULL);
} else if (bw == BW80) {
/*
* channel is a center channel and as such, not necessarily a
* valid 20 MHz channels. Override earlier allow_channel()
* result and use only the 80 MHz specific version.
*/
res2 = res = verify_80mhz(mode, op_class, channel);
} else if (bw == BW160) {
/*
* channel is a center channel and as such, not necessarily a
* valid 20 MHz channels. Override earlier allow_channel()
* result and use only the 160 MHz specific version.
*/
res2 = res = verify_160mhz(mode, op_class, channel);
} else if (bw == BW80P80) {
/*
* channel is a center channel and as such, not necessarily a
* valid 20 MHz channels. Override earlier allow_channel()
* result and use only the 80 MHz specific version.
*/
res2 = res = verify_80mhz(mode, op_class, channel);
}
if (res == NOT_ALLOWED || res2 == NOT_ALLOWED)
return NOT_ALLOWED;
if (res == NO_IR || res2 == NO_IR)
return NO_IR;
return ALLOWED;
}
static int wpas_op_class_supported(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid,
const struct oper_class_map *op_class)
{
int chan;
size_t i;
struct hostapd_hw_modes *mode;
int found;
int z;
int freq2 = 0;
int freq5 = 0;
mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op_class->mode,
is_6ghz_op_class(op_class->op_class));
if (!mode)
return 0;
/* If we are configured to disable certain things, take that into
* account here. */
if (ssid && ssid->freq_list && ssid->freq_list[0]) {
for (z = 0; ; z++) {
int f = ssid->freq_list[z];
if (f == 0)
break; /* end of list */
if (f > 4000 && f < 6000)
freq5 = 1;
else if (f > 2400 && f < 2500)
freq2 = 1;
}
} else {
/* No frequencies specified, can use anything hardware supports.
*/
freq2 = freq5 = 1;
}
if (op_class->op_class >= 115 && op_class->op_class <= 130 && !freq5)
return 0;
if (op_class->op_class >= 81 && op_class->op_class <= 84 && !freq2)
return 0;
#ifdef CONFIG_HT_OVERRIDES
if (ssid && ssid->disable_ht) {
switch (op_class->op_class) {
case 83:
case 84:
case 104:
case 105:
case 116:
case 117:
case 119:
case 120:
case 122:
case 123:
case 126:
case 127:
case 128:
case 129:
case 130:
/* Disable >= 40 MHz channels if HT is disabled */
return 0;
}
}
#endif /* CONFIG_HT_OVERRIDES */
#ifdef CONFIG_VHT_OVERRIDES
if (ssid && ssid->disable_vht) {
if (op_class->op_class >= 128 && op_class->op_class <= 130) {
/* Disable >= 80 MHz channels if VHT is disabled */
return 0;
}
}
#endif /* CONFIG_VHT_OVERRIDES */
if (op_class->op_class == 128) {
u8 channels[] = { 42, 58, 106, 122, 138, 155 };
for (i = 0; i < ARRAY_SIZE(channels); i++) {
if (verify_channel(mode, op_class->op_class,
channels[i], op_class->bw) !=
NOT_ALLOWED)
return 1;
}
return 0;
}
if (op_class->op_class == 129) {
/* Check if either 160 MHz channels is allowed */
return verify_channel(mode, op_class->op_class, 50,
op_class->bw) != NOT_ALLOWED ||
verify_channel(mode, op_class->op_class, 114,
op_class->bw) != NOT_ALLOWED;
}
if (op_class->op_class == 130) {
/* Need at least two non-contiguous 80 MHz segments */
found = 0;
if (verify_channel(mode, op_class->op_class, 42,
op_class->bw) != NOT_ALLOWED ||
verify_channel(mode, op_class->op_class, 58,
op_class->bw) != NOT_ALLOWED)
found++;
if (verify_channel(mode, op_class->op_class, 106,
op_class->bw) != NOT_ALLOWED ||
verify_channel(mode, op_class->op_class, 122,
op_class->bw) != NOT_ALLOWED ||
verify_channel(mode, op_class->op_class, 138,
op_class->bw) != NOT_ALLOWED)
found++;
if (verify_channel(mode, op_class->op_class, 106,
op_class->bw) != NOT_ALLOWED &&
verify_channel(mode, op_class->op_class, 138,
op_class->bw) != NOT_ALLOWED)
found++;
if (verify_channel(mode, op_class->op_class, 155,
op_class->bw) != NOT_ALLOWED)
found++;
if (found >= 2)
return 1;
return 0;
}
if (op_class->op_class == 135) {
/* Need at least two 80 MHz segments which do not fall under the
* same 160 MHz segment to support 80+80 in 6 GHz.
*/
int first_seg = 0;
int curr_seg = 0;
for (chan = op_class->min_chan; chan <= op_class->max_chan;
chan += op_class->inc) {
curr_seg++;
if (verify_channel(mode, op_class->op_class, chan,
op_class->bw) != NOT_ALLOWED) {
if (!first_seg) {
first_seg = curr_seg;
continue;
}
/* Supported if at least two non-consecutive 80
* MHz segments allowed.
*/
if ((curr_seg - first_seg) > 1)
return 1;
/* Supported even if the 80 MHz segments are
* consecutive when they do not fall under the
* same 160 MHz segment.
*/
if ((first_seg % 2) == 0)
return 1;
}
}
return 0;
}
found = 0;
for (chan = op_class->min_chan; chan <= op_class->max_chan;
chan += op_class->inc) {
if (verify_channel(mode, op_class->op_class, chan,
op_class->bw) != NOT_ALLOWED) {
found = 1;
break;
}
}
return found;
}
static int wpas_sta_secondary_channel_offset(struct wpa_bss *bss, u8 *current,
u8 *channel)
{
const u8 *ies;
u8 phy_type;
size_t ies_len;
if (!bss)
return -1;
ies = wpa_bss_ie_ptr(bss);
ies_len = bss->ie_len ? bss->ie_len : bss->beacon_ie_len;
return wpas_get_op_chan_phy(bss->freq, ies, ies_len, current,
channel, &phy_type);
}
size_t wpas_supp_op_class_ie(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid,
struct wpa_bss *bss, u8 *pos, size_t len)
{
struct wpabuf *buf;
u8 op, current, chan;
u8 *ie_len;
size_t res;
/*
* Determine the current operating class correct mode based on
* advertised BSS capabilities, if available. Fall back to a less
* accurate guess based on frequency if the needed IEs are not available
* or used.
*/
if (wpas_sta_secondary_channel_offset(bss, &current, &chan) < 0 &&
ieee80211_freq_to_channel_ext(bss->freq, 0, CHANWIDTH_USE_HT,
&current, &chan) == NUM_HOSTAPD_MODES)
return 0;
/*
* Need 3 bytes for EID, length, and current operating class, plus
* 1 byte for every other supported operating class.
*/
buf = wpabuf_alloc(global_op_class_size + 3);
if (!buf)
return 0;
wpabuf_put_u8(buf, WLAN_EID_SUPPORTED_OPERATING_CLASSES);
/* Will set the length later, putting a placeholder */
ie_len = wpabuf_put(buf, 1);
wpabuf_put_u8(buf, current);
for (op = 0; global_op_class[op].op_class; op++) {
if (wpas_op_class_supported(wpa_s, ssid, &global_op_class[op]))
wpabuf_put_u8(buf, global_op_class[op].op_class);
}
*ie_len = wpabuf_len(buf) - 2;
if (*ie_len < 2) {
wpa_printf(MSG_DEBUG,
"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;
}