/* * hostapd / IEEE 802.11n HT * Copyright (c) 2002-2009, Jouni Malinen * Copyright (c) 2007-2008, Intel Corporation * * 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 "hostapd.h" #include "ap_config.h" #include "sta_info.h" #include "beacon.h" #include "ieee802_11.h" u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid) { struct ieee80211_ht_capabilities *cap; u8 *pos = eid; if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode || hapd->conf->disable_11n) return eid; *pos++ = WLAN_EID_HT_CAP; *pos++ = sizeof(*cap); cap = (struct ieee80211_ht_capabilities *) pos; os_memset(cap, 0, sizeof(*cap)); cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab); cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params; os_memcpy(cap->supported_mcs_set, hapd->iface->current_mode->mcs_set, 16); /* TODO: ht_extended_capabilities (now fully disabled) */ /* TODO: tx_bf_capability_info (now fully disabled) */ /* TODO: asel_capabilities (now fully disabled) */ pos += sizeof(*cap); if (hapd->iconf->obss_interval) { struct ieee80211_obss_scan_parameters *scan_params; *pos++ = WLAN_EID_OVERLAPPING_BSS_SCAN_PARAMS; *pos++ = sizeof(*scan_params); scan_params = (struct ieee80211_obss_scan_parameters *) pos; os_memset(scan_params, 0, sizeof(*scan_params)); scan_params->width_trigger_scan_interval = host_to_le16(hapd->iconf->obss_interval); /* Fill in default values for remaining parameters * (IEEE Std 802.11-2012, 8.4.2.61 and MIB defval) */ scan_params->scan_passive_dwell = host_to_le16(20); scan_params->scan_active_dwell = host_to_le16(10); scan_params->scan_passive_total_per_channel = host_to_le16(200); scan_params->scan_active_total_per_channel = host_to_le16(20); scan_params->channel_transition_delay_factor = host_to_le16(5); scan_params->scan_activity_threshold = host_to_le16(25); pos += sizeof(*scan_params); } return pos; } u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid) { struct ieee80211_ht_operation *oper; u8 *pos = eid; if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n) return eid; *pos++ = WLAN_EID_HT_OPERATION; *pos++ = sizeof(*oper); oper = (struct ieee80211_ht_operation *) pos; os_memset(oper, 0, sizeof(*oper)); oper->control_chan = hapd->iconf->channel; oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode); if (hapd->iconf->secondary_channel == 1) oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE | HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH; if (hapd->iconf->secondary_channel == -1) oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW | HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH; pos += sizeof(*oper); return pos; } /* op_mode Set to 0 (HT pure) under the followign conditions - all STAs in the BSS are 20/40 MHz HT in 20/40 MHz BSS or - all STAs in the BSS are 20 MHz HT in 20 MHz BSS Set to 1 (HT non-member protection) if there may be non-HT STAs in both the primary and the secondary channel Set to 2 if only HT STAs are associated in BSS, however and at least one 20 MHz HT STA is associated Set to 3 (HT mixed mode) when one or more non-HT STAs are associated */ int hostapd_ht_operation_update(struct hostapd_iface *iface) { u16 cur_op_mode, new_op_mode; int op_mode_changes = 0; if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed) return 0; wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X", __func__, iface->ht_op_mode); if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) && iface->num_sta_ht_no_gf) { iface->ht_op_mode |= HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT; op_mode_changes++; } else if ((iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) && iface->num_sta_ht_no_gf == 0) { iface->ht_op_mode &= ~HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT; op_mode_changes++; } if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) && (iface->num_sta_no_ht || iface->olbc_ht)) { iface->ht_op_mode |= HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT; op_mode_changes++; } else if ((iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) && (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) { iface->ht_op_mode &= ~HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT; op_mode_changes++; } if (iface->num_sta_no_ht) new_op_mode = OP_MODE_MIXED; else if (iface->conf->secondary_channel && iface->num_sta_ht_20mhz) new_op_mode = OP_MODE_20MHZ_HT_STA_ASSOCED; else if (iface->olbc_ht) new_op_mode = OP_MODE_MAY_BE_LEGACY_STAS; else new_op_mode = OP_MODE_PURE; cur_op_mode = iface->ht_op_mode & HT_INFO_OPERATION_MODE_OP_MODE_MASK; if (cur_op_mode != new_op_mode) { iface->ht_op_mode &= ~HT_INFO_OPERATION_MODE_OP_MODE_MASK; iface->ht_op_mode |= new_op_mode; op_mode_changes++; } wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d", __func__, iface->ht_op_mode, op_mode_changes); return op_mode_changes; } u16 copy_sta_ht_capab(struct hostapd_data *hapd, struct sta_info *sta, const u8 *ht_capab, size_t ht_capab_len) { /* Disable HT caps for STAs associated to no-HT BSSes. */ if (!ht_capab || ht_capab_len < sizeof(struct ieee80211_ht_capabilities) || hapd->conf->disable_11n) { sta->flags &= ~WLAN_STA_HT; os_free(sta->ht_capabilities); sta->ht_capabilities = NULL; return WLAN_STATUS_SUCCESS; } if (sta->ht_capabilities == NULL) { sta->ht_capabilities = os_zalloc(sizeof(struct ieee80211_ht_capabilities)); if (sta->ht_capabilities == NULL) return WLAN_STATUS_UNSPECIFIED_FAILURE; } sta->flags |= WLAN_STA_HT; os_memcpy(sta->ht_capabilities, ht_capab, sizeof(struct ieee80211_ht_capabilities)); return WLAN_STATUS_SUCCESS; } static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta) { u16 ht_capab; ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info); wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: " "0x%04x", MAC2STR(sta->addr), ht_capab); if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) { if (!sta->no_ht_gf_set) { sta->no_ht_gf_set = 1; hapd->iface->num_sta_ht_no_gf++; } wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num " "of non-gf stations %d", __func__, MAC2STR(sta->addr), hapd->iface->num_sta_ht_no_gf); } if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) { if (!sta->ht_20mhz_set) { sta->ht_20mhz_set = 1; hapd->iface->num_sta_ht_20mhz++; } wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of " "20MHz HT STAs %d", __func__, MAC2STR(sta->addr), hapd->iface->num_sta_ht_20mhz); } } static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta) { if (!sta->no_ht_set) { sta->no_ht_set = 1; hapd->iface->num_sta_no_ht++; } if (hapd->iconf->ieee80211n) { wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of " "non-HT stations %d", __func__, MAC2STR(sta->addr), hapd->iface->num_sta_no_ht); } } void update_ht_state(struct hostapd_data *hapd, struct sta_info *sta) { if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities) update_sta_ht(hapd, sta); else update_sta_no_ht(hapd, sta); if (hostapd_ht_operation_update(hapd->iface) > 0) ieee802_11_set_beacons(hapd->iface); } void hostapd_get_ht_capab(struct hostapd_data *hapd, struct ieee80211_ht_capabilities *ht_cap, struct ieee80211_ht_capabilities *neg_ht_cap) { u16 cap; if (ht_cap == NULL) return; os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap)); cap = le_to_host16(neg_ht_cap->ht_capabilities_info); /* * Mask out HT features we don't support, but don't overwrite * non-symmetric features like STBC and SMPS. Just because * we're not in dynamic SMPS mode the STA might still be. */ cap &= (hapd->iconf->ht_capab | HT_CAP_INFO_RX_STBC_MASK | HT_CAP_INFO_TX_STBC | HT_CAP_INFO_SMPS_MASK); /* * STBC needs to be handled specially * if we don't support RX STBC, mask out TX STBC in the STA's HT caps * if we don't support TX STBC, mask out RX STBC in the STA's HT caps */ if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK)) cap &= ~HT_CAP_INFO_TX_STBC; if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC)) cap &= ~HT_CAP_INFO_RX_STBC_MASK; neg_ht_cap->ht_capabilities_info = host_to_le16(cap); }