1214501Srpaulo/* 2214501Srpaulo * hostapd / IEEE 802.11n HT 3214501Srpaulo * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi> 4214501Srpaulo * Copyright (c) 2007-2008, Intel Corporation 5214501Srpaulo * 6214501Srpaulo * This program is free software; you can redistribute it and/or modify 7214501Srpaulo * it under the terms of the GNU General Public License version 2 as 8214501Srpaulo * published by the Free Software Foundation. 9214501Srpaulo * 10214501Srpaulo * Alternatively, this software may be distributed under the terms of BSD 11214501Srpaulo * license. 12214501Srpaulo * 13214501Srpaulo * See README and COPYING for more details. 14214501Srpaulo */ 15214501Srpaulo 16214501Srpaulo#include "utils/includes.h" 17214501Srpaulo 18214501Srpaulo#include "utils/common.h" 19214501Srpaulo#include "common/ieee802_11_defs.h" 20214501Srpaulo#include "drivers/driver.h" 21214501Srpaulo#include "hostapd.h" 22214501Srpaulo#include "ap_config.h" 23214501Srpaulo#include "sta_info.h" 24214501Srpaulo#include "beacon.h" 25214501Srpaulo#include "ieee802_11.h" 26214501Srpaulo 27214501Srpaulo 28214501Srpaulou8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid) 29214501Srpaulo{ 30214501Srpaulo struct ieee80211_ht_capabilities *cap; 31214501Srpaulo u8 *pos = eid; 32214501Srpaulo 33252726Srpaulo if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode || 34252726Srpaulo hapd->conf->disable_11n) 35214501Srpaulo return eid; 36214501Srpaulo 37214501Srpaulo *pos++ = WLAN_EID_HT_CAP; 38214501Srpaulo *pos++ = sizeof(*cap); 39214501Srpaulo 40214501Srpaulo cap = (struct ieee80211_ht_capabilities *) pos; 41214501Srpaulo os_memset(cap, 0, sizeof(*cap)); 42214501Srpaulo cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab); 43214501Srpaulo cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params; 44214501Srpaulo os_memcpy(cap->supported_mcs_set, hapd->iface->current_mode->mcs_set, 45214501Srpaulo 16); 46214501Srpaulo 47214501Srpaulo /* TODO: ht_extended_capabilities (now fully disabled) */ 48214501Srpaulo /* TODO: tx_bf_capability_info (now fully disabled) */ 49214501Srpaulo /* TODO: asel_capabilities (now fully disabled) */ 50214501Srpaulo 51214501Srpaulo pos += sizeof(*cap); 52214501Srpaulo 53214501Srpaulo return pos; 54214501Srpaulo} 55214501Srpaulo 56214501Srpaulo 57214501Srpaulou8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid) 58214501Srpaulo{ 59214501Srpaulo struct ieee80211_ht_operation *oper; 60214501Srpaulo u8 *pos = eid; 61214501Srpaulo 62252726Srpaulo if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n) 63214501Srpaulo return eid; 64214501Srpaulo 65214501Srpaulo *pos++ = WLAN_EID_HT_OPERATION; 66214501Srpaulo *pos++ = sizeof(*oper); 67214501Srpaulo 68214501Srpaulo oper = (struct ieee80211_ht_operation *) pos; 69214501Srpaulo os_memset(oper, 0, sizeof(*oper)); 70214501Srpaulo 71214501Srpaulo oper->control_chan = hapd->iconf->channel; 72214501Srpaulo oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode); 73214501Srpaulo if (hapd->iconf->secondary_channel == 1) 74214501Srpaulo oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE | 75214501Srpaulo HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH; 76214501Srpaulo if (hapd->iconf->secondary_channel == -1) 77214501Srpaulo oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW | 78214501Srpaulo HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH; 79214501Srpaulo 80214501Srpaulo pos += sizeof(*oper); 81214501Srpaulo 82214501Srpaulo return pos; 83214501Srpaulo} 84214501Srpaulo 85214501Srpaulo 86214501Srpaulo/* 87214501Srpauloop_mode 88214501SrpauloSet to 0 (HT pure) under the followign conditions 89214501Srpaulo - all STAs in the BSS are 20/40 MHz HT in 20/40 MHz BSS or 90214501Srpaulo - all STAs in the BSS are 20 MHz HT in 20 MHz BSS 91214501SrpauloSet to 1 (HT non-member protection) if there may be non-HT STAs 92214501Srpaulo in both the primary and the secondary channel 93214501SrpauloSet to 2 if only HT STAs are associated in BSS, 94214501Srpaulo however and at least one 20 MHz HT STA is associated 95214501SrpauloSet to 3 (HT mixed mode) when one or more non-HT STAs are associated 96214501Srpaulo*/ 97214501Srpauloint hostapd_ht_operation_update(struct hostapd_iface *iface) 98214501Srpaulo{ 99214501Srpaulo u16 cur_op_mode, new_op_mode; 100214501Srpaulo int op_mode_changes = 0; 101214501Srpaulo 102214501Srpaulo if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed) 103214501Srpaulo return 0; 104214501Srpaulo 105214501Srpaulo wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X", 106214501Srpaulo __func__, iface->ht_op_mode); 107214501Srpaulo 108214501Srpaulo if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) 109214501Srpaulo && iface->num_sta_ht_no_gf) { 110214501Srpaulo iface->ht_op_mode |= 111214501Srpaulo HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT; 112214501Srpaulo op_mode_changes++; 113214501Srpaulo } else if ((iface->ht_op_mode & 114214501Srpaulo HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) && 115214501Srpaulo iface->num_sta_ht_no_gf == 0) { 116214501Srpaulo iface->ht_op_mode &= 117214501Srpaulo ~HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT; 118214501Srpaulo op_mode_changes++; 119214501Srpaulo } 120214501Srpaulo 121214501Srpaulo if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) && 122214501Srpaulo (iface->num_sta_no_ht || iface->olbc_ht)) { 123214501Srpaulo iface->ht_op_mode |= HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT; 124214501Srpaulo op_mode_changes++; 125214501Srpaulo } else if ((iface->ht_op_mode & 126214501Srpaulo HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) && 127214501Srpaulo (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) { 128214501Srpaulo iface->ht_op_mode &= 129214501Srpaulo ~HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT; 130214501Srpaulo op_mode_changes++; 131214501Srpaulo } 132214501Srpaulo 133214501Srpaulo new_op_mode = 0; 134252726Srpaulo if (iface->num_sta_no_ht) 135214501Srpaulo new_op_mode = OP_MODE_MIXED; 136214501Srpaulo else if ((iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) 137214501Srpaulo && iface->num_sta_ht_20mhz) 138214501Srpaulo new_op_mode = OP_MODE_20MHZ_HT_STA_ASSOCED; 139214501Srpaulo else if (iface->olbc_ht) 140214501Srpaulo new_op_mode = OP_MODE_MAY_BE_LEGACY_STAS; 141214501Srpaulo else 142214501Srpaulo new_op_mode = OP_MODE_PURE; 143214501Srpaulo 144214501Srpaulo cur_op_mode = iface->ht_op_mode & HT_INFO_OPERATION_MODE_OP_MODE_MASK; 145214501Srpaulo if (cur_op_mode != new_op_mode) { 146214501Srpaulo iface->ht_op_mode &= ~HT_INFO_OPERATION_MODE_OP_MODE_MASK; 147214501Srpaulo iface->ht_op_mode |= new_op_mode; 148214501Srpaulo op_mode_changes++; 149214501Srpaulo } 150214501Srpaulo 151214501Srpaulo wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d", 152214501Srpaulo __func__, iface->ht_op_mode, op_mode_changes); 153214501Srpaulo 154214501Srpaulo return op_mode_changes; 155214501Srpaulo} 156214501Srpaulo 157214501Srpaulo 158252726Srpaulou16 copy_sta_ht_capab(struct hostapd_data *hapd, struct sta_info *sta, 159252726Srpaulo const u8 *ht_capab, size_t ht_capab_len) 160214501Srpaulo{ 161252726Srpaulo /* Disable HT caps for STAs associated to no-HT BSSes. */ 162214501Srpaulo if (!ht_capab || 163252726Srpaulo ht_capab_len < sizeof(struct ieee80211_ht_capabilities) || 164252726Srpaulo hapd->conf->disable_11n) { 165214501Srpaulo sta->flags &= ~WLAN_STA_HT; 166214501Srpaulo os_free(sta->ht_capabilities); 167214501Srpaulo sta->ht_capabilities = NULL; 168214501Srpaulo return WLAN_STATUS_SUCCESS; 169214501Srpaulo } 170214501Srpaulo 171214501Srpaulo if (sta->ht_capabilities == NULL) { 172214501Srpaulo sta->ht_capabilities = 173214501Srpaulo os_zalloc(sizeof(struct ieee80211_ht_capabilities)); 174214501Srpaulo if (sta->ht_capabilities == NULL) 175214501Srpaulo return WLAN_STATUS_UNSPECIFIED_FAILURE; 176214501Srpaulo } 177214501Srpaulo 178214501Srpaulo sta->flags |= WLAN_STA_HT; 179214501Srpaulo os_memcpy(sta->ht_capabilities, ht_capab, 180214501Srpaulo sizeof(struct ieee80211_ht_capabilities)); 181214501Srpaulo 182214501Srpaulo return WLAN_STATUS_SUCCESS; 183214501Srpaulo} 184214501Srpaulo 185214501Srpaulo 186214501Srpaulostatic void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta) 187214501Srpaulo{ 188214501Srpaulo u16 ht_capab; 189214501Srpaulo 190214501Srpaulo ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info); 191214501Srpaulo wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: " 192214501Srpaulo "0x%04x", MAC2STR(sta->addr), ht_capab); 193214501Srpaulo if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) { 194214501Srpaulo if (!sta->no_ht_gf_set) { 195214501Srpaulo sta->no_ht_gf_set = 1; 196214501Srpaulo hapd->iface->num_sta_ht_no_gf++; 197214501Srpaulo } 198214501Srpaulo wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num " 199214501Srpaulo "of non-gf stations %d", 200214501Srpaulo __func__, MAC2STR(sta->addr), 201214501Srpaulo hapd->iface->num_sta_ht_no_gf); 202214501Srpaulo } 203214501Srpaulo if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) { 204214501Srpaulo if (!sta->ht_20mhz_set) { 205214501Srpaulo sta->ht_20mhz_set = 1; 206214501Srpaulo hapd->iface->num_sta_ht_20mhz++; 207214501Srpaulo } 208214501Srpaulo wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of " 209214501Srpaulo "20MHz HT STAs %d", 210214501Srpaulo __func__, MAC2STR(sta->addr), 211214501Srpaulo hapd->iface->num_sta_ht_20mhz); 212214501Srpaulo } 213214501Srpaulo} 214214501Srpaulo 215214501Srpaulo 216214501Srpaulostatic void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta) 217214501Srpaulo{ 218214501Srpaulo if (!sta->no_ht_set) { 219214501Srpaulo sta->no_ht_set = 1; 220214501Srpaulo hapd->iface->num_sta_no_ht++; 221214501Srpaulo } 222214501Srpaulo if (hapd->iconf->ieee80211n) { 223214501Srpaulo wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of " 224214501Srpaulo "non-HT stations %d", 225214501Srpaulo __func__, MAC2STR(sta->addr), 226214501Srpaulo hapd->iface->num_sta_no_ht); 227214501Srpaulo } 228214501Srpaulo} 229214501Srpaulo 230214501Srpaulo 231214501Srpaulovoid update_ht_state(struct hostapd_data *hapd, struct sta_info *sta) 232214501Srpaulo{ 233214501Srpaulo if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities) 234214501Srpaulo update_sta_ht(hapd, sta); 235214501Srpaulo else 236214501Srpaulo update_sta_no_ht(hapd, sta); 237214501Srpaulo 238214501Srpaulo if (hostapd_ht_operation_update(hapd->iface) > 0) 239214501Srpaulo ieee802_11_set_beacons(hapd->iface); 240214501Srpaulo} 241214501Srpaulo 242214501Srpaulo 243214501Srpaulovoid hostapd_get_ht_capab(struct hostapd_data *hapd, 244214501Srpaulo struct ieee80211_ht_capabilities *ht_cap, 245214501Srpaulo struct ieee80211_ht_capabilities *neg_ht_cap) 246214501Srpaulo{ 247214501Srpaulo u16 cap; 248214501Srpaulo 249214501Srpaulo if (ht_cap == NULL) 250214501Srpaulo return; 251214501Srpaulo os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap)); 252214501Srpaulo cap = le_to_host16(neg_ht_cap->ht_capabilities_info); 253214501Srpaulo 254214501Srpaulo /* 255252726Srpaulo * Mask out HT features we don't support, but don't overwrite 256252726Srpaulo * non-symmetric features like STBC and SMPS. Just because 257252726Srpaulo * we're not in dynamic SMPS mode the STA might still be. 258252726Srpaulo */ 259252726Srpaulo cap &= (hapd->iconf->ht_capab | HT_CAP_INFO_RX_STBC_MASK | 260252726Srpaulo HT_CAP_INFO_TX_STBC | HT_CAP_INFO_SMPS_MASK); 261252726Srpaulo 262252726Srpaulo /* 263214501Srpaulo * STBC needs to be handled specially 264214501Srpaulo * if we don't support RX STBC, mask out TX STBC in the STA's HT caps 265214501Srpaulo * if we don't support TX STBC, mask out RX STBC in the STA's HT caps 266214501Srpaulo */ 267214501Srpaulo if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK)) 268214501Srpaulo cap &= ~HT_CAP_INFO_TX_STBC; 269214501Srpaulo if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC)) 270214501Srpaulo cap &= ~HT_CAP_INFO_RX_STBC_MASK; 271214501Srpaulo 272214501Srpaulo neg_ht_cap->ht_capabilities_info = host_to_le16(cap); 273214501Srpaulo} 274