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hostapd/src/ap/ieee802_11_he.c
Jouni Malinen 15d63c6043 Clean up hostapd_get_he_twt_responder() processing 
mode->he_capab is an array and as such, there is no point in checking
whether it is NULL since that cannot be the case. Check for the
he_supported flag instead. In addition, convert the TWT responder
capability bit into a fixed value 1 to avoid any surprising to the
callers. In practice, neither of these changes results in different
behavior in the current implementation, but this is more robust.

Signed-off-by: Jouni Malinen <j@w1.fi>
2020-03-08 16:28:03 +02:00

430 lines
11 KiB
C
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/*
* hostapd / IEEE 802.11ax HE
* Copyright (c) 2016-2017, Qualcomm Atheros, Inc.
* Copyright (c) 2019 John Crispin <john@phrozen.org>
*
* 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_defs.h"
#include "common/ieee802_11_common.h"
#include "hostapd.h"
#include "ap_config.h"
#include "beacon.h"
#include "sta_info.h"
#include "ieee802_11.h"
#include "dfs.h"
static u8 ieee80211_he_ppet_size(u8 ppe_thres_hdr, const u8 *phy_cap_info)
{
u8 sz = 0, ru;
if ((phy_cap_info[HE_PHYCAP_PPE_THRESHOLD_PRESENT_IDX] &
HE_PHYCAP_PPE_THRESHOLD_PRESENT) == 0)
return 0;
ru = (ppe_thres_hdr >> HE_PPE_THRES_RU_INDEX_BITMASK_SHIFT) &
HE_PPE_THRES_RU_INDEX_BITMASK_MASK;
while (ru) {
if (ru & 0x1)
sz++;
ru >>= 1;
}
sz *= 1 + (ppe_thres_hdr & HE_PPE_THRES_NSS_MASK);
sz = (sz * 6) + 7;
if (sz % 8)
sz += 8;
sz /= 8;
return sz;
}
static u8 ieee80211_he_mcs_set_size(const u8 *phy_cap_info)
{
u8 sz = 4;
if (phy_cap_info[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX] &
HE_PHYCAP_CHANNEL_WIDTH_SET_80PLUS80MHZ_IN_5G)
sz += 4;
if (phy_cap_info[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX] &
HE_PHYCAP_CHANNEL_WIDTH_SET_160MHZ_IN_5G)
sz += 4;
return sz;
}
static int ieee80211_invalid_he_cap_size(const u8 *buf, size_t len)
{
struct ieee80211_he_capabilities *cap;
size_t cap_len;
cap = (struct ieee80211_he_capabilities *) buf;
cap_len = sizeof(*cap) - sizeof(cap->optional);
if (len < cap_len)
return 1;
cap_len += ieee80211_he_mcs_set_size(cap->he_phy_capab_info);
if (len < cap_len)
return 1;
cap_len += ieee80211_he_ppet_size(buf[cap_len], cap->he_phy_capab_info);
return len != cap_len;
}
u8 * hostapd_eid_he_capab(struct hostapd_data *hapd, u8 *eid,
enum ieee80211_op_mode opmode)
{
struct ieee80211_he_capabilities *cap;
struct hostapd_hw_modes *mode = hapd->iface->current_mode;
u8 he_oper_chwidth = ~HE_PHYCAP_CHANNEL_WIDTH_MASK;
u8 *pos = eid;
u8 ie_size = 0, mcs_nss_size = 4, ppet_size = 0;
if (!mode)
return eid;
ie_size = sizeof(*cap) - sizeof(cap->optional);
ppet_size = ieee80211_he_ppet_size(mode->he_capab[opmode].ppet[0],
mode->he_capab[opmode].phy_cap);
switch (hapd->iface->conf->he_oper_chwidth) {
case CHANWIDTH_80P80MHZ:
he_oper_chwidth |=
HE_PHYCAP_CHANNEL_WIDTH_SET_80PLUS80MHZ_IN_5G;
mcs_nss_size += 4;
/* fall through */
case CHANWIDTH_160MHZ:
he_oper_chwidth |= HE_PHYCAP_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
mcs_nss_size += 4;
/* fall through */
case CHANWIDTH_80MHZ:
case CHANWIDTH_USE_HT:
he_oper_chwidth |= HE_PHYCAP_CHANNEL_WIDTH_SET_40MHZ_IN_2G |
HE_PHYCAP_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G;
break;
}
ie_size += mcs_nss_size + ppet_size;
*pos++ = WLAN_EID_EXTENSION;
*pos++ = 1 + ie_size;
*pos++ = WLAN_EID_EXT_HE_CAPABILITIES;
cap = (struct ieee80211_he_capabilities *) pos;
os_memset(cap, 0, sizeof(*cap));
os_memcpy(cap->he_mac_capab_info, mode->he_capab[opmode].mac_cap,
HE_MAX_MAC_CAPAB_SIZE);
os_memcpy(cap->he_phy_capab_info, mode->he_capab[opmode].phy_cap,
HE_MAX_PHY_CAPAB_SIZE);
os_memcpy(cap->optional, mode->he_capab[opmode].mcs, mcs_nss_size);
if (ppet_size)
os_memcpy(&cap->optional[mcs_nss_size],
mode->he_capab[opmode].ppet, ppet_size);
if (hapd->iface->conf->he_phy_capab.he_su_beamformer)
cap->he_phy_capab_info[HE_PHYCAP_SU_BEAMFORMER_CAPAB_IDX] |=
HE_PHYCAP_SU_BEAMFORMER_CAPAB;
else
cap->he_phy_capab_info[HE_PHYCAP_SU_BEAMFORMER_CAPAB_IDX] &=
~HE_PHYCAP_SU_BEAMFORMER_CAPAB;
if (hapd->iface->conf->he_phy_capab.he_su_beamformee)
cap->he_phy_capab_info[HE_PHYCAP_SU_BEAMFORMEE_CAPAB_IDX] |=
HE_PHYCAP_SU_BEAMFORMEE_CAPAB;
else
cap->he_phy_capab_info[HE_PHYCAP_SU_BEAMFORMEE_CAPAB_IDX] &=
~HE_PHYCAP_SU_BEAMFORMEE_CAPAB;
if (hapd->iface->conf->he_phy_capab.he_mu_beamformer)
cap->he_phy_capab_info[HE_PHYCAP_MU_BEAMFORMER_CAPAB_IDX] |=
HE_PHYCAP_MU_BEAMFORMER_CAPAB;
else
cap->he_phy_capab_info[HE_PHYCAP_MU_BEAMFORMER_CAPAB_IDX] &=
~HE_PHYCAP_MU_BEAMFORMER_CAPAB;
cap->he_phy_capab_info[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX] &=
he_oper_chwidth;
pos += ie_size;
return pos;
}
u8 * hostapd_eid_he_operation(struct hostapd_data *hapd, u8 *eid)
{
struct ieee80211_he_operation *oper;
u8 *pos = eid;
int oper_size = 6;
u32 params = 0;
if (!hapd->iface->current_mode)
return eid;
if (is_6ghz_op_class(hapd->iconf->op_class))
oper_size += 5;
*pos++ = WLAN_EID_EXTENSION;
*pos++ = 1 + oper_size;
*pos++ = WLAN_EID_EXT_HE_OPERATION;
oper = (struct ieee80211_he_operation *) pos;
os_memset(oper, 0, sizeof(*oper));
if (hapd->iface->conf->he_op.he_default_pe_duration)
params |= (hapd->iface->conf->he_op.he_default_pe_duration <<
HE_OPERATION_DFLT_PE_DURATION_OFFSET);
if (hapd->iface->conf->he_op.he_twt_required)
params |= HE_OPERATION_TWT_REQUIRED;
if (hapd->iface->conf->he_op.he_rts_threshold)
params |= (hapd->iface->conf->he_op.he_rts_threshold <<
HE_OPERATION_RTS_THRESHOLD_OFFSET);
if (hapd->iface->conf->he_op.he_bss_color_disabled)
params |= HE_OPERATION_BSS_COLOR_DISABLED;
if (hapd->iface->conf->he_op.he_bss_color_partial)
params |= HE_OPERATION_BSS_COLOR_PARTIAL;
params |= hapd->iface->conf->he_op.he_bss_color <<
HE_OPERATION_BSS_COLOR_OFFSET;
/* HE minimum required basic MCS and NSS for STAs */
oper->he_mcs_nss_set =
host_to_le16(hapd->iface->conf->he_op.he_basic_mcs_nss_set);
/* TODO: conditional MaxBSSID Indicator subfield */
pos += 6; /* skip the fixed part */
if (is_6ghz_op_class(hapd->iconf->op_class)) {
u8 seg0 = hostapd_get_oper_centr_freq_seg0_idx(hapd->iconf);
u8 seg1 = hostapd_get_oper_centr_freq_seg1_idx(hapd->iconf);
if (!seg0)
seg0 = hapd->iconf->channel;
params |= HE_OPERATION_6GHZ_OPER_INFO;
/* 6 GHz Operation Information field */
*pos++ = hapd->iconf->channel; /* Primary Channel */
/* Control: Channel Width */
if (seg1)
*pos++ = 3;
else
*pos++ = center_idx_to_bw_6ghz(seg0);
/* Channel Center Freq Seg0/Seg1 */
*pos++ = seg0;
*pos++ = seg1;
/* Minimum Rate */
*pos++ = 6; /* TODO: what should be set here? */
}
oper->he_oper_params = host_to_le32(params);
return pos;
}
u8 * hostapd_eid_he_mu_edca_parameter_set(struct hostapd_data *hapd, u8 *eid)
{
struct ieee80211_he_mu_edca_parameter_set *edca;
u8 *pos;
size_t i;
pos = (u8 *) &hapd->iface->conf->he_mu_edca;
for (i = 0; i < sizeof(*edca); i++) {
if (pos[i])
break;
}
if (i == sizeof(*edca))
return eid; /* no MU EDCA Parameters configured */
pos = eid;
*pos++ = WLAN_EID_EXTENSION;
*pos++ = 1 + sizeof(*edca);
*pos++ = WLAN_EID_EXT_HE_MU_EDCA_PARAMS;
edca = (struct ieee80211_he_mu_edca_parameter_set *) pos;
os_memcpy(edca, &hapd->iface->conf->he_mu_edca, sizeof(*edca));
wpa_hexdump(MSG_DEBUG, "HE: MU EDCA Parameter Set element",
pos, sizeof(*edca));
pos += sizeof(*edca);
return pos;
}
u8 * hostapd_eid_spatial_reuse(struct hostapd_data *hapd, u8 *eid)
{
struct ieee80211_spatial_reuse *spr;
u8 *pos = eid, *spr_param;
u8 sz = 1;
if (!hapd->iface->conf->spr.sr_control)
return eid;
if (hapd->iface->conf->spr.sr_control &
SPATIAL_REUSE_NON_SRG_OFFSET_PRESENT)
sz++;
if (hapd->iface->conf->spr.sr_control &
SPATIAL_REUSE_SRG_INFORMATION_PRESENT)
sz += 18;
*pos++ = WLAN_EID_EXTENSION;
*pos++ = 1 + sz;
*pos++ = WLAN_EID_EXT_SPATIAL_REUSE;
spr = (struct ieee80211_spatial_reuse *) pos;
os_memset(spr, 0, sizeof(*spr));
spr->sr_ctrl = hapd->iface->conf->spr.sr_control;
pos++;
spr_param = spr->params;
if (spr->sr_ctrl & SPATIAL_REUSE_NON_SRG_OFFSET_PRESENT) {
*spr_param++ =
hapd->iface->conf->spr.non_srg_obss_pd_max_offset;
pos++;
}
if (spr->sr_ctrl & SPATIAL_REUSE_SRG_INFORMATION_PRESENT) {
*spr_param++ = hapd->iface->conf->spr.srg_obss_pd_min_offset;
*spr_param++ = hapd->iface->conf->spr.srg_obss_pd_max_offset;
pos += 18;
}
return pos;
}
void hostapd_get_he_capab(struct hostapd_data *hapd,
const struct ieee80211_he_capabilities *he_cap,
struct ieee80211_he_capabilities *neg_he_cap,
size_t he_capab_len)
{
if (!he_cap)
return;
if (he_capab_len > sizeof(*neg_he_cap))
he_capab_len = sizeof(*neg_he_cap);
/* TODO: mask out unsupported features */
os_memcpy(neg_he_cap, he_cap, he_capab_len);
}
static int check_valid_he_mcs(struct hostapd_data *hapd, const u8 *sta_he_capab,
enum ieee80211_op_mode opmode)
{
u16 sta_rx_mcs_set, ap_tx_mcs_set;
u8 mcs_count = 0;
const u16 *ap_mcs_set, *sta_mcs_set;
int i;
if (!hapd->iface->current_mode)
return 1;
ap_mcs_set = (u16 *) hapd->iface->current_mode->he_capab[opmode].mcs;
sta_mcs_set = (u16 *) ((const struct ieee80211_he_capabilities *)
sta_he_capab)->optional;
/*
* Disable HE capabilities for STAs for which there is not even a single
* allowed MCS in any supported number of streams, i.e., STA is
* advertising 3 (not supported) as HE MCS rates for all supported
* band/stream cases.
*/
switch (hapd->iface->conf->he_oper_chwidth) {
case CHANWIDTH_80P80MHZ:
mcs_count = 3;
break;
case CHANWIDTH_160MHZ:
mcs_count = 2;
break;
default:
mcs_count = 1;
break;
}
for (i = 0; i < mcs_count; i++) {
int j;
/* AP Tx MCS map vs. STA Rx MCS map */
sta_rx_mcs_set = WPA_GET_LE16((const u8 *) &sta_mcs_set[i * 2]);
ap_tx_mcs_set = WPA_GET_LE16((const u8 *)
&ap_mcs_set[(i * 2) + 1]);
for (j = 0; j < HE_NSS_MAX_STREAMS; j++) {
if (((ap_tx_mcs_set >> (j * 2)) & 0x3) == 3)
continue;
if (((sta_rx_mcs_set >> (j * 2)) & 0x3) == 3)
continue;
return 1;
}
}
wpa_printf(MSG_DEBUG,
"No matching HE MCS found between AP TX and STA RX");
return 0;
}
u16 copy_sta_he_capab(struct hostapd_data *hapd, struct sta_info *sta,
enum ieee80211_op_mode opmode, const u8 *he_capab,
size_t he_capab_len)
{
if (!he_capab || !hapd->iconf->ieee80211ax ||
!check_valid_he_mcs(hapd, he_capab, opmode) ||
ieee80211_invalid_he_cap_size(he_capab, he_capab_len) ||
he_capab_len > sizeof(struct ieee80211_he_capabilities)) {
sta->flags &= ~WLAN_STA_HE;
os_free(sta->he_capab);
sta->he_capab = NULL;
return WLAN_STATUS_SUCCESS;
}
if (!sta->he_capab) {
sta->he_capab =
os_zalloc(sizeof(struct ieee80211_he_capabilities));
if (!sta->he_capab)
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
sta->flags |= WLAN_STA_HE;
os_memset(sta->he_capab, 0, sizeof(struct ieee80211_he_capabilities));
os_memcpy(sta->he_capab, he_capab, he_capab_len);
sta->he_capab_len = he_capab_len;
return WLAN_STATUS_SUCCESS;
}
int hostapd_get_he_twt_responder(struct hostapd_data *hapd,
enum ieee80211_op_mode mode)
{
u8 *mac_cap;
if (!hapd->iface->current_mode ||
!hapd->iface->current_mode->he_capab[mode].he_supported)
return 0;
mac_cap = hapd->iface->current_mode->he_capab[mode].mac_cap;
return !!(mac_cap[HE_MAC_CAPAB_0] & HE_MACCAP_TWT_RESPONDER);
}
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