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 software may be distributed under the terms of the BSD license. 7 * See README for more details. 8 */ 9 10 #include "utils/includes.h" 11 12 #include "utils/common.h" 13 #include "common/ieee802_11_defs.h" 14 #include "hostapd.h" 15 #include "ap_config.h" 16 #include "sta_info.h" 17 #include "beacon.h" 18 #include "ieee802_11.h" 19 20 21 u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid) 22 { 23 struct ieee80211_ht_capabilities *cap; 24 u8 *pos = eid; 25 26 if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode || 27 hapd->conf->disable_11n) 28 return eid; 29 30 *pos++ = WLAN_EID_HT_CAP; 31 *pos++ = sizeof(*cap); 32 33 cap = (struct ieee80211_ht_capabilities *) pos; 34 os_memset(cap, 0, sizeof(*cap)); 35 cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab); 36 cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params; 37 os_memcpy(cap->supported_mcs_set, hapd->iface->current_mode->mcs_set, 38 16); 39 40 /* TODO: ht_extended_capabilities (now fully disabled) */ 41 /* TODO: tx_bf_capability_info (now fully disabled) */ 42 /* TODO: asel_capabilities (now fully disabled) */ 43 44 pos += sizeof(*cap); 45 46 if (hapd->iconf->obss_interval) { 47 struct ieee80211_obss_scan_parameters *scan_params; 48 49 *pos++ = WLAN_EID_OVERLAPPING_BSS_SCAN_PARAMS; 50 *pos++ = sizeof(*scan_params); 51 52 scan_params = (struct ieee80211_obss_scan_parameters *) pos; 53 os_memset(scan_params, 0, sizeof(*scan_params)); 54 scan_params->width_trigger_scan_interval = 55 host_to_le16(hapd->iconf->obss_interval); 56 57 /* TODO: Fill in more parameters (supplicant ignores them) */ 58 59 pos += sizeof(*scan_params); 60 } 61 62 return pos; 63 } 64 65 66 u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid) 67 { 68 struct ieee80211_ht_operation *oper; 69 u8 *pos = eid; 70 71 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n) 72 return eid; 73 74 *pos++ = WLAN_EID_HT_OPERATION; 75 *pos++ = sizeof(*oper); 76 77 oper = (struct ieee80211_ht_operation *) pos; 78 os_memset(oper, 0, sizeof(*oper)); 79 80 oper->control_chan = hapd->iconf->channel; 81 oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode); 82 if (hapd->iconf->secondary_channel == 1) 83 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE | 84 HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH; 85 if (hapd->iconf->secondary_channel == -1) 86 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW | 87 HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH; 88 89 pos += sizeof(*oper); 90 91 return pos; 92 } 93 94 95 /* 96 op_mode 97 Set to 0 (HT pure) under the followign conditions 98 - all STAs in the BSS are 20/40 MHz HT in 20/40 MHz BSS or 99 - all STAs in the BSS are 20 MHz HT in 20 MHz BSS 100 Set to 1 (HT non-member protection) if there may be non-HT STAs 101 in both the primary and the secondary channel 102 Set to 2 if only HT STAs are associated in BSS, 103 however and at least one 20 MHz HT STA is associated 104 Set to 3 (HT mixed mode) when one or more non-HT STAs are associated 105 */ 106 int hostapd_ht_operation_update(struct hostapd_iface *iface) 107 { 108 u16 cur_op_mode, new_op_mode; 109 int op_mode_changes = 0; 110 111 if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed) 112 return 0; 113 114 wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X", 115 __func__, iface->ht_op_mode); 116 117 if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) 118 && iface->num_sta_ht_no_gf) { 119 iface->ht_op_mode |= 120 HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT; 121 op_mode_changes++; 122 } else if ((iface->ht_op_mode & 123 HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) && 124 iface->num_sta_ht_no_gf == 0) { 125 iface->ht_op_mode &= 126 ~HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT; 127 op_mode_changes++; 128 } 129 130 if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) && 131 (iface->num_sta_no_ht || iface->olbc_ht)) { 132 iface->ht_op_mode |= HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT; 133 op_mode_changes++; 134 } else if ((iface->ht_op_mode & 135 HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) && 136 (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) { 137 iface->ht_op_mode &= 138 ~HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT; 139 op_mode_changes++; 140 } 141 142 new_op_mode = 0; 143 if (iface->num_sta_no_ht) 144 new_op_mode = OP_MODE_MIXED; 145 else if (iface->conf->secondary_channel && iface->num_sta_ht_20mhz) 146 new_op_mode = OP_MODE_20MHZ_HT_STA_ASSOCED; 147 else if (iface->olbc_ht) 148 new_op_mode = OP_MODE_MAY_BE_LEGACY_STAS; 149 else 150 new_op_mode = OP_MODE_PURE; 151 152 cur_op_mode = iface->ht_op_mode & HT_INFO_OPERATION_MODE_OP_MODE_MASK; 153 if (cur_op_mode != new_op_mode) { 154 iface->ht_op_mode &= ~HT_INFO_OPERATION_MODE_OP_MODE_MASK; 155 iface->ht_op_mode |= new_op_mode; 156 op_mode_changes++; 157 } 158 159 wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d", 160 __func__, iface->ht_op_mode, op_mode_changes); 161 162 return op_mode_changes; 163 } 164 165 166 u16 copy_sta_ht_capab(struct hostapd_data *hapd, struct sta_info *sta, 167 const u8 *ht_capab, size_t ht_capab_len) 168 { 169 /* Disable HT caps for STAs associated to no-HT BSSes. */ 170 if (!ht_capab || 171 ht_capab_len < sizeof(struct ieee80211_ht_capabilities) || 172 hapd->conf->disable_11n) { 173 sta->flags &= ~WLAN_STA_HT; 174 os_free(sta->ht_capabilities); 175 sta->ht_capabilities = NULL; 176 return WLAN_STATUS_SUCCESS; 177 } 178 179 if (sta->ht_capabilities == NULL) { 180 sta->ht_capabilities = 181 os_zalloc(sizeof(struct ieee80211_ht_capabilities)); 182 if (sta->ht_capabilities == NULL) 183 return WLAN_STATUS_UNSPECIFIED_FAILURE; 184 } 185 186 sta->flags |= WLAN_STA_HT; 187 os_memcpy(sta->ht_capabilities, ht_capab, 188 sizeof(struct ieee80211_ht_capabilities)); 189 190 return WLAN_STATUS_SUCCESS; 191 } 192 193 194 static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta) 195 { 196 u16 ht_capab; 197 198 ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info); 199 wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: " 200 "0x%04x", MAC2STR(sta->addr), ht_capab); 201 if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) { 202 if (!sta->no_ht_gf_set) { 203 sta->no_ht_gf_set = 1; 204 hapd->iface->num_sta_ht_no_gf++; 205 } 206 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num " 207 "of non-gf stations %d", 208 __func__, MAC2STR(sta->addr), 209 hapd->iface->num_sta_ht_no_gf); 210 } 211 if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) { 212 if (!sta->ht_20mhz_set) { 213 sta->ht_20mhz_set = 1; 214 hapd->iface->num_sta_ht_20mhz++; 215 } 216 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of " 217 "20MHz HT STAs %d", 218 __func__, MAC2STR(sta->addr), 219 hapd->iface->num_sta_ht_20mhz); 220 } 221 } 222 223 224 static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta) 225 { 226 if (!sta->no_ht_set) { 227 sta->no_ht_set = 1; 228 hapd->iface->num_sta_no_ht++; 229 } 230 if (hapd->iconf->ieee80211n) { 231 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of " 232 "non-HT stations %d", 233 __func__, MAC2STR(sta->addr), 234 hapd->iface->num_sta_no_ht); 235 } 236 } 237 238 239 void update_ht_state(struct hostapd_data *hapd, struct sta_info *sta) 240 { 241 if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities) 242 update_sta_ht(hapd, sta); 243 else 244 update_sta_no_ht(hapd, sta); 245 246 if (hostapd_ht_operation_update(hapd->iface) > 0) 247 ieee802_11_set_beacons(hapd->iface); 248 } 249 250 251 void hostapd_get_ht_capab(struct hostapd_data *hapd, 252 struct ieee80211_ht_capabilities *ht_cap, 253 struct ieee80211_ht_capabilities *neg_ht_cap) 254 { 255 u16 cap; 256 257 if (ht_cap == NULL) 258 return; 259 os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap)); 260 cap = le_to_host16(neg_ht_cap->ht_capabilities_info); 261 262 /* 263 * Mask out HT features we don't support, but don't overwrite 264 * non-symmetric features like STBC and SMPS. Just because 265 * we're not in dynamic SMPS mode the STA might still be. 266 */ 267 cap &= (hapd->iconf->ht_capab | HT_CAP_INFO_RX_STBC_MASK | 268 HT_CAP_INFO_TX_STBC | HT_CAP_INFO_SMPS_MASK); 269 270 /* 271 * STBC needs to be handled specially 272 * if we don't support RX STBC, mask out TX STBC in the STA's HT caps 273 * if we don't support TX STBC, mask out RX STBC in the STA's HT caps 274 */ 275 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK)) 276 cap &= ~HT_CAP_INFO_TX_STBC; 277 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC)) 278 cap &= ~HT_CAP_INFO_RX_STBC_MASK; 279 280 neg_ht_cap->ht_capabilities_info = host_to_le16(cap); 281 } 282