1/* 2 * hostapd / IEEE 802.11n HT 3 * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi> 4 * Copyright (c) 2007-2008, Intel Corporation 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Alternatively, this software may be distributed under the terms of BSD 11 * license. 12 * 13 * See README and COPYING for more details. 14 */ 15 16#include "utils/includes.h" 17 18#include "utils/common.h" 19#include "common/ieee802_11_defs.h" 20#include "drivers/driver.h" 21#include "hostapd.h" 22#include "ap_config.h" 23#include "sta_info.h" 24#include "beacon.h" 25#include "ieee802_11.h" 26 27 28u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid) 29{ 30 struct ieee80211_ht_capabilities *cap; 31 u8 *pos = eid; 32 33 if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode) 34 return eid; 35 36 *pos++ = WLAN_EID_HT_CAP; 37 *pos++ = sizeof(*cap); 38 39 cap = (struct ieee80211_ht_capabilities *) pos; 40 os_memset(cap, 0, sizeof(*cap)); 41 cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab); 42 cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params; 43 os_memcpy(cap->supported_mcs_set, hapd->iface->current_mode->mcs_set, 44 16); 45 46 /* TODO: ht_extended_capabilities (now fully disabled) */ 47 /* TODO: tx_bf_capability_info (now fully disabled) */ 48 /* TODO: asel_capabilities (now fully disabled) */ 49 50 pos += sizeof(*cap); 51 52 return pos; 53} 54 55 56u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid) 57{ 58 struct ieee80211_ht_operation *oper; 59 u8 *pos = eid; 60 61 if (!hapd->iconf->ieee80211n) 62 return eid; 63 64 *pos++ = WLAN_EID_HT_OPERATION; 65 *pos++ = sizeof(*oper); 66 67 oper = (struct ieee80211_ht_operation *) pos; 68 os_memset(oper, 0, sizeof(*oper)); 69 70 oper->control_chan = hapd->iconf->channel; 71 oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode); 72 if (hapd->iconf->secondary_channel == 1) 73 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE | 74 HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH; 75 if (hapd->iconf->secondary_channel == -1) 76 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW | 77 HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH; 78 79 pos += sizeof(*oper); 80 81 return pos; 82} 83 84 85/* 86op_mode 87Set to 0 (HT pure) under the followign conditions 88 - all STAs in the BSS are 20/40 MHz HT in 20/40 MHz BSS or 89 - all STAs in the BSS are 20 MHz HT in 20 MHz BSS 90Set to 1 (HT non-member protection) if there may be non-HT STAs 91 in both the primary and the secondary channel 92Set to 2 if only HT STAs are associated in BSS, 93 however and at least one 20 MHz HT STA is associated 94Set to 3 (HT mixed mode) when one or more non-HT STAs are associated 95 (currently non-GF HT station is considered as non-HT STA also) 96*/ 97int hostapd_ht_operation_update(struct hostapd_iface *iface) 98{ 99 u16 cur_op_mode, new_op_mode; 100 int op_mode_changes = 0; 101 102 if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed) 103 return 0; 104 105 wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X", 106 __func__, iface->ht_op_mode); 107 108 if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) 109 && iface->num_sta_ht_no_gf) { 110 iface->ht_op_mode |= 111 HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT; 112 op_mode_changes++; 113 } else if ((iface->ht_op_mode & 114 HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) && 115 iface->num_sta_ht_no_gf == 0) { 116 iface->ht_op_mode &= 117 ~HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT; 118 op_mode_changes++; 119 } 120 121 if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) && 122 (iface->num_sta_no_ht || iface->olbc_ht)) { 123 iface->ht_op_mode |= HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT; 124 op_mode_changes++; 125 } else if ((iface->ht_op_mode & 126 HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) && 127 (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) { 128 iface->ht_op_mode &= 129 ~HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT; 130 op_mode_changes++; 131 } 132 133 /* Note: currently we switch to the MIXED op mode if HT non-greenfield 134 * station is associated. Probably it's a theoretical case, since 135 * it looks like all known HT STAs support greenfield. 136 */ 137 new_op_mode = 0; 138 if (iface->num_sta_no_ht || 139 (iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT)) 140 new_op_mode = OP_MODE_MIXED; 141 else if ((iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) 142 && iface->num_sta_ht_20mhz) 143 new_op_mode = OP_MODE_20MHZ_HT_STA_ASSOCED; 144 else if (iface->olbc_ht) 145 new_op_mode = OP_MODE_MAY_BE_LEGACY_STAS; 146 else 147 new_op_mode = OP_MODE_PURE; 148 149 cur_op_mode = iface->ht_op_mode & HT_INFO_OPERATION_MODE_OP_MODE_MASK; 150 if (cur_op_mode != new_op_mode) { 151 iface->ht_op_mode &= ~HT_INFO_OPERATION_MODE_OP_MODE_MASK; 152 iface->ht_op_mode |= new_op_mode; 153 op_mode_changes++; 154 } 155 156 wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d", 157 __func__, iface->ht_op_mode, op_mode_changes); 158 159 return op_mode_changes; 160} 161 162 163u16 copy_sta_ht_capab(struct sta_info *sta, const u8 *ht_capab, 164 size_t ht_capab_len) 165{ 166 if (!ht_capab || 167 ht_capab_len < sizeof(struct ieee80211_ht_capabilities)) { 168 sta->flags &= ~WLAN_STA_HT; 169 os_free(sta->ht_capabilities); 170 sta->ht_capabilities = NULL; 171 return WLAN_STATUS_SUCCESS; 172 } 173 174 if (sta->ht_capabilities == NULL) { 175 sta->ht_capabilities = 176 os_zalloc(sizeof(struct ieee80211_ht_capabilities)); 177 if (sta->ht_capabilities == NULL) 178 return WLAN_STATUS_UNSPECIFIED_FAILURE; 179 } 180 181 sta->flags |= WLAN_STA_HT; 182 os_memcpy(sta->ht_capabilities, ht_capab, 183 sizeof(struct ieee80211_ht_capabilities)); 184 185 return WLAN_STATUS_SUCCESS; 186} 187 188 189static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta) 190{ 191 u16 ht_capab; 192 193 ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info); 194 wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: " 195 "0x%04x", MAC2STR(sta->addr), ht_capab); 196 if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) { 197 if (!sta->no_ht_gf_set) { 198 sta->no_ht_gf_set = 1; 199 hapd->iface->num_sta_ht_no_gf++; 200 } 201 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num " 202 "of non-gf stations %d", 203 __func__, MAC2STR(sta->addr), 204 hapd->iface->num_sta_ht_no_gf); 205 } 206 if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) { 207 if (!sta->ht_20mhz_set) { 208 sta->ht_20mhz_set = 1; 209 hapd->iface->num_sta_ht_20mhz++; 210 } 211 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of " 212 "20MHz HT STAs %d", 213 __func__, MAC2STR(sta->addr), 214 hapd->iface->num_sta_ht_20mhz); 215 } 216} 217 218 219static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta) 220{ 221 if (!sta->no_ht_set) { 222 sta->no_ht_set = 1; 223 hapd->iface->num_sta_no_ht++; 224 } 225 if (hapd->iconf->ieee80211n) { 226 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of " 227 "non-HT stations %d", 228 __func__, MAC2STR(sta->addr), 229 hapd->iface->num_sta_no_ht); 230 } 231} 232 233 234void update_ht_state(struct hostapd_data *hapd, struct sta_info *sta) 235{ 236 if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities) 237 update_sta_ht(hapd, sta); 238 else 239 update_sta_no_ht(hapd, sta); 240 241 if (hostapd_ht_operation_update(hapd->iface) > 0) 242 ieee802_11_set_beacons(hapd->iface); 243} 244 245 246void hostapd_get_ht_capab(struct hostapd_data *hapd, 247 struct ieee80211_ht_capabilities *ht_cap, 248 struct ieee80211_ht_capabilities *neg_ht_cap) 249{ 250 u16 cap; 251 252 if (ht_cap == NULL) 253 return; 254 os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap)); 255 cap = le_to_host16(neg_ht_cap->ht_capabilities_info); 256 cap &= hapd->iconf->ht_capab; 257 cap |= (hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_DISABLED); 258 259 /* 260 * STBC needs to be handled specially 261 * if we don't support RX STBC, mask out TX STBC in the STA's HT caps 262 * if we don't support TX STBC, mask out RX STBC in the STA's HT caps 263 */ 264 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK)) 265 cap &= ~HT_CAP_INFO_TX_STBC; 266 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC)) 267 cap &= ~HT_CAP_INFO_RX_STBC_MASK; 268 269 neg_ht_cap->ht_capabilities_info = host_to_le16(cap); 270} 271