/*
* 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"
static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode, u8 chan,
unsigned int *flags)
{
int i;
for (i = 0; i < mode->num_channels; i++) {
if (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)
{
u8 center_channels[] = { 42, 58, 106, 122, 138, 155 };
size_t i;
if (mode->mode != HOSTAPD_MODE_IEEE80211A)
return 0;
for (i = 0; i < ARRAY_SIZE(center_channels); 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 channel)
{
u8 center_chan;
unsigned int i;
unsigned int no_ir = 0;
center_chan = get_center_80mhz(mode, channel);
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, 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)
{
u8 center_channels[] = { 50, 114 };
unsigned int i;
if (mode->mode != HOSTAPD_MODE_IEEE80211A)
return 0;
for (i = 0; i < ARRAY_SIZE(center_channels); 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 channel)
{
u8 center_chan;
unsigned int i;
unsigned int no_ir = 0;
center_chan = get_center_160mhz(mode, channel);
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, 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 channel,
u8 bw)
{
unsigned int flag = 0;
enum chan_allowed res, res2;
res2 = res = allow_channel(mode, channel, &flag);
if (bw == BW40MINUS) {
if (!(flag & HOSTAPD_CHAN_HT40MINUS))
return NOT_ALLOWED;
res2 = allow_channel(mode, channel - 4, NULL);
} else if (bw == BW40PLUS) {
if (!(flag & HOSTAPD_CHAN_HT40PLUS))
return NOT_ALLOWED;
res2 = allow_channel(mode, 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, 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, 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, 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,
const struct oper_class_map *op_class)
{
int chan;
size_t i;
struct hostapd_hw_modes *mode;
int found;
mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op_class->mode);
if (!mode)
return 0;
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, 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, 50, op_class->bw) != NOT_ALLOWED ||
verify_channel(mode, 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, 42, op_class->bw) != NOT_ALLOWED ||
verify_channel(mode, 58, op_class->bw) != NOT_ALLOWED)
found++;
if (verify_channel(mode, 106, op_class->bw) != NOT_ALLOWED ||
verify_channel(mode, 122, op_class->bw) != NOT_ALLOWED ||
verify_channel(mode, 138, op_class->bw) != NOT_ALLOWED)
found++;
if (verify_channel(mode, 106, op_class->bw) != NOT_ALLOWED &&
verify_channel(mode, 138, op_class->bw) != NOT_ALLOWED)
found++;
if (verify_channel(mode, 155, op_class->bw) != NOT_ALLOWED)
found++;
if (found >= 2)
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, chan, op_class->bw) != NOT_ALLOWED) {
found = 1;
break;
}
}
return found;
}
size_t wpas_supp_op_class_ie(struct wpa_supplicant *wpa_s, int freq, u8 *pos,
size_t len)
{
struct wpabuf *buf;
u8 op, current, chan;
u8 *ie_len;
size_t res;
/*
* Assume 20 MHz channel for now.
* TODO: Use the secondary channel and VHT channel width that will be
* used after association.
*/
if (ieee80211_freq_to_channel_ext(freq, 0, VHT_CHANWIDTH_USE_HT,
¤t, &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, &global_op_class[op]))
wpabuf_put_u8(buf, global_op_class[op].op_class);
}
*ie_len = wpabuf_len(buf) - 2;
if (*ie_len < 2 || wpabuf_len(buf) > len) {
wpa_printf(MSG_ERROR,
"Failed to add supported operating classes IE");
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;
}