/* * hostapd / Hardware feature query and different modes * Copyright 2002-2003, Instant802 Networks, Inc. * Copyright 2005-2006, Devicescape Software, Inc. * Copyright (c) 2008-2012, Jouni Malinen * * 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 "utils/eloop.h" #include "common/ieee802_11_defs.h" #include "common/ieee802_11_common.h" #include "common/wpa_ctrl.h" #include "common/hw_features_common.h" #include "hostapd.h" #include "ap_config.h" #include "ap_drv_ops.h" #include "acs.h" #include "ieee802_11.h" #include "beacon.h" #include "hw_features.h" void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features, size_t num_hw_features) { size_t i; if (hw_features == NULL) return; for (i = 0; i < num_hw_features; i++) { os_free(hw_features[i].channels); os_free(hw_features[i].rates); } os_free(hw_features); } #ifndef CONFIG_NO_STDOUT_DEBUG static char * dfs_info(struct hostapd_channel_data *chan) { static char info[256]; char *state; switch (chan->flag & HOSTAPD_CHAN_DFS_MASK) { case HOSTAPD_CHAN_DFS_UNKNOWN: state = "unknown"; break; case HOSTAPD_CHAN_DFS_USABLE: state = "usable"; break; case HOSTAPD_CHAN_DFS_UNAVAILABLE: state = "unavailable"; break; case HOSTAPD_CHAN_DFS_AVAILABLE: state = "available"; break; default: return ""; } os_snprintf(info, sizeof(info), " (DFS state = %s)", state); info[sizeof(info) - 1] = '\0'; return info; } #endif /* CONFIG_NO_STDOUT_DEBUG */ int hostapd_get_hw_features(struct hostapd_iface *iface) { struct hostapd_data *hapd = iface->bss[0]; int i, j; u16 num_modes, flags; struct hostapd_hw_modes *modes; u8 dfs_domain; if (hostapd_drv_none(hapd)) return -1; modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags, &dfs_domain); if (modes == NULL) { hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211, HOSTAPD_LEVEL_DEBUG, "Fetching hardware channel/rate support not " "supported."); return -1; } iface->hw_flags = flags; iface->dfs_domain = dfs_domain; hostapd_free_hw_features(iface->hw_features, iface->num_hw_features); iface->hw_features = modes; iface->num_hw_features = num_modes; for (i = 0; i < num_modes; i++) { struct hostapd_hw_modes *feature = &modes[i]; int dfs_enabled = hapd->iconf->ieee80211h && (iface->drv_flags & WPA_DRIVER_FLAGS_RADAR); /* set flag for channels we can use in current regulatory * domain */ for (j = 0; j < feature->num_channels; j++) { int dfs = 0; /* * Disable all channels that are marked not to allow * to initiate radiation (a.k.a. passive scan and no * IBSS). * Use radar channels only if the driver supports DFS. */ if ((feature->channels[j].flag & HOSTAPD_CHAN_RADAR) && dfs_enabled) { dfs = 1; } else if (((feature->channels[j].flag & HOSTAPD_CHAN_RADAR) && !(iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)) || (feature->channels[j].flag & HOSTAPD_CHAN_NO_IR)) { feature->channels[j].flag |= HOSTAPD_CHAN_DISABLED; } if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED) continue; wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d " "chan=%d freq=%d MHz max_tx_power=%d dBm%s", feature->mode, feature->channels[j].chan, feature->channels[j].freq, feature->channels[j].max_tx_power, dfs ? dfs_info(&feature->channels[j]) : ""); } } return 0; } int hostapd_prepare_rates(struct hostapd_iface *iface, struct hostapd_hw_modes *mode) { int i, num_basic_rates = 0; int basic_rates_a[] = { 60, 120, 240, -1 }; int basic_rates_b[] = { 10, 20, -1 }; int basic_rates_g[] = { 10, 20, 55, 110, -1 }; int *basic_rates; if (iface->conf->basic_rates) basic_rates = iface->conf->basic_rates; else switch (mode->mode) { case HOSTAPD_MODE_IEEE80211A: basic_rates = basic_rates_a; break; case HOSTAPD_MODE_IEEE80211B: basic_rates = basic_rates_b; break; case HOSTAPD_MODE_IEEE80211G: basic_rates = basic_rates_g; break; case HOSTAPD_MODE_IEEE80211AD: return 0; /* No basic rates for 11ad */ default: return -1; } i = 0; while (basic_rates[i] >= 0) i++; if (i) i++; /* -1 termination */ os_free(iface->basic_rates); iface->basic_rates = os_malloc(i * sizeof(int)); if (iface->basic_rates) os_memcpy(iface->basic_rates, basic_rates, i * sizeof(int)); os_free(iface->current_rates); iface->num_rates = 0; iface->current_rates = os_calloc(mode->num_rates, sizeof(struct hostapd_rate_data)); if (!iface->current_rates) { wpa_printf(MSG_ERROR, "Failed to allocate memory for rate " "table."); return -1; } for (i = 0; i < mode->num_rates; i++) { struct hostapd_rate_data *rate; if (iface->conf->supported_rates && !hostapd_rate_found(iface->conf->supported_rates, mode->rates[i])) continue; rate = &iface->current_rates[iface->num_rates]; rate->rate = mode->rates[i]; if (hostapd_rate_found(basic_rates, rate->rate)) { rate->flags |= HOSTAPD_RATE_BASIC; num_basic_rates++; } wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x", iface->num_rates, rate->rate, rate->flags); iface->num_rates++; } if ((iface->num_rates == 0 || num_basic_rates == 0) && (!iface->conf->ieee80211n || !iface->conf->require_ht)) { wpa_printf(MSG_ERROR, "No rates remaining in supported/basic " "rate sets (%d,%d).", iface->num_rates, num_basic_rates); return -1; } return 0; } #ifdef CONFIG_IEEE80211N static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface) { int pri_chan, sec_chan; pri_chan = iface->conf->channel; sec_chan = pri_chan + iface->conf->secondary_channel * 4; return allowed_ht40_channel_pair(iface->current_mode, pri_chan, sec_chan); } static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface) { if (iface->conf->secondary_channel > 0) { iface->conf->channel += 4; iface->conf->secondary_channel = -1; } else { iface->conf->channel -= 4; iface->conf->secondary_channel = 1; } } static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface, struct wpa_scan_results *scan_res) { int pri_chan, sec_chan; int res; pri_chan = iface->conf->channel; sec_chan = pri_chan + iface->conf->secondary_channel * 4; res = check_40mhz_5g(iface->current_mode, scan_res, pri_chan, sec_chan); if (res == 2) { if (iface->conf->no_pri_sec_switch) { wpa_printf(MSG_DEBUG, "Cannot switch PRI/SEC channels due to local constraint"); } else { ieee80211n_switch_pri_sec(iface); } } return !!res; } static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface, struct wpa_scan_results *scan_res) { int pri_chan, sec_chan; pri_chan = iface->conf->channel; sec_chan = pri_chan + iface->conf->secondary_channel * 4; return check_40mhz_2g4(iface->current_mode, scan_res, pri_chan, sec_chan); } static void ieee80211n_check_scan(struct hostapd_iface *iface) { struct wpa_scan_results *scan_res; int oper40; int res; /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is * allowed per IEEE Std 802.11-2012, 10.15.3.2 */ iface->scan_cb = NULL; scan_res = hostapd_driver_get_scan_results(iface->bss[0]); if (scan_res == NULL) { hostapd_setup_interface_complete(iface, 1); return; } if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A) oper40 = ieee80211n_check_40mhz_5g(iface, scan_res); else oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res); wpa_scan_results_free(scan_res); iface->secondary_ch = iface->conf->secondary_channel; if (!oper40) { wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on " "channel pri=%d sec=%d based on overlapping BSSes", iface->conf->channel, iface->conf->channel + iface->conf->secondary_channel * 4); iface->conf->secondary_channel = 0; if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) { /* * TODO: Could consider scheduling another scan to check * if channel width can be changed if no coex reports * are received from associating stations. */ } } res = ieee80211n_allowed_ht40_channel_pair(iface); if (!res) { iface->conf->secondary_channel = 0; hostapd_set_oper_centr_freq_seg0_idx(iface->conf, 0); hostapd_set_oper_centr_freq_seg1_idx(iface->conf, 0); hostapd_set_oper_chwidth(iface->conf, CHANWIDTH_USE_HT); res = 1; wpa_printf(MSG_INFO, "Fallback to 20 MHz"); } hostapd_setup_interface_complete(iface, !res); } static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface, struct wpa_driver_scan_params *params) { /* Scan only the affected frequency range */ int pri_freq, sec_freq; int affected_start, affected_end; int i, pos; struct hostapd_hw_modes *mode; if (iface->current_mode == NULL) return; pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); if (iface->conf->secondary_channel > 0) sec_freq = pri_freq + 20; else sec_freq = pri_freq - 20; /* * Note: Need to find the PRI channel also in cases where the affected * channel is the SEC channel of a 40 MHz BSS, so need to include the * scanning coverage here to be 40 MHz from the center frequency. */ affected_start = (pri_freq + sec_freq) / 2 - 40; affected_end = (pri_freq + sec_freq) / 2 + 40; wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", affected_start, affected_end); mode = iface->current_mode; params->freqs = os_calloc(mode->num_channels + 1, sizeof(int)); if (params->freqs == NULL) return; pos = 0; for (i = 0; i < mode->num_channels; i++) { struct hostapd_channel_data *chan = &mode->channels[i]; if (chan->flag & HOSTAPD_CHAN_DISABLED) continue; if (chan->freq < affected_start || chan->freq > affected_end) continue; params->freqs[pos++] = chan->freq; } } static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface, struct wpa_driver_scan_params *params) { /* Scan only the affected frequency range */ int pri_freq; int affected_start, affected_end; int i, pos; struct hostapd_hw_modes *mode; if (iface->current_mode == NULL) return; pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); if (iface->conf->secondary_channel > 0) { affected_start = pri_freq - 10; affected_end = pri_freq + 30; } else { affected_start = pri_freq - 30; affected_end = pri_freq + 10; } wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", affected_start, affected_end); mode = iface->current_mode; params->freqs = os_calloc(mode->num_channels + 1, sizeof(int)); if (params->freqs == NULL) return; pos = 0; for (i = 0; i < mode->num_channels; i++) { struct hostapd_channel_data *chan = &mode->channels[i]; if (chan->flag & HOSTAPD_CHAN_DISABLED) continue; if (chan->freq < affected_start || chan->freq > affected_end) continue; params->freqs[pos++] = chan->freq; } } static void ap_ht40_scan_retry(void *eloop_data, void *user_data) { #define HT2040_COEX_SCAN_RETRY 15 struct hostapd_iface *iface = eloop_data; struct wpa_driver_scan_params params; int ret; os_memset(¶ms, 0, sizeof(params)); if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) ieee80211n_scan_channels_2g4(iface, ¶ms); else ieee80211n_scan_channels_5g(iface, ¶ms); ret = hostapd_driver_scan(iface->bss[0], ¶ms); iface->num_ht40_scan_tries++; os_free(params.freqs); if (ret == -EBUSY && iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) { wpa_printf(MSG_ERROR, "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)", ret, strerror(-ret), iface->num_ht40_scan_tries); eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL); return; } if (ret == 0) { iface->scan_cb = ieee80211n_check_scan; return; } wpa_printf(MSG_DEBUG, "Failed to request a scan in device, bringing up in HT20 mode"); iface->conf->secondary_channel = 0; iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET; hostapd_setup_interface_complete(iface, 0); } void hostapd_stop_setup_timers(struct hostapd_iface *iface) { eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL); } static int ieee80211n_check_40mhz(struct hostapd_iface *iface) { struct wpa_driver_scan_params params; int ret; /* Check that HT40 is used and PRI / SEC switch is allowed */ if (!iface->conf->secondary_channel || iface->conf->no_pri_sec_switch) return 0; hostapd_set_state(iface, HAPD_IFACE_HT_SCAN); wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling " "40 MHz channel"); os_memset(¶ms, 0, sizeof(params)); if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) ieee80211n_scan_channels_2g4(iface, ¶ms); else ieee80211n_scan_channels_5g(iface, ¶ms); ret = hostapd_driver_scan(iface->bss[0], ¶ms); os_free(params.freqs); if (ret == -EBUSY) { wpa_printf(MSG_ERROR, "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again", ret, strerror(-ret)); iface->num_ht40_scan_tries = 1; eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL); eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL); return 1; } if (ret < 0) { wpa_printf(MSG_ERROR, "Failed to request a scan of neighboring BSSes ret=%d (%s)", ret, strerror(-ret)); return -1; } iface->scan_cb = ieee80211n_check_scan; return 1; } static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface) { u16 hw = iface->current_mode->ht_capab; u16 conf = iface->conf->ht_capab; if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) && !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [LDPC]"); return 0; } /* * Driver ACS chosen channel may not be HT40 due to internal driver * restrictions. */ if (!iface->conf->acs && (conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) && !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [HT40*]"); return 0; } switch (conf & HT_CAP_INFO_SMPS_MASK) { case HT_CAP_INFO_SMPS_STATIC: if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_STATIC)) { wpa_printf(MSG_ERROR, "Driver does not support configured HT capability [SMPS-STATIC]"); return 0; } break; case HT_CAP_INFO_SMPS_DYNAMIC: if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_DYNAMIC)) { wpa_printf(MSG_ERROR, "Driver does not support configured HT capability [SMPS-DYNAMIC]"); return 0; } break; case HT_CAP_INFO_SMPS_DISABLED: default: break; } if ((conf & HT_CAP_INFO_GREEN_FIELD) && !(hw & HT_CAP_INFO_GREEN_FIELD)) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [GF]"); return 0; } if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) && !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [SHORT-GI-20]"); return 0; } if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) && !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [SHORT-GI-40]"); return 0; } if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [TX-STBC]"); return 0; } if ((conf & HT_CAP_INFO_RX_STBC_MASK) > (hw & HT_CAP_INFO_RX_STBC_MASK)) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [RX-STBC*]"); return 0; } if ((conf & HT_CAP_INFO_DELAYED_BA) && !(hw & HT_CAP_INFO_DELAYED_BA)) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [DELAYED-BA]"); return 0; } if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) && !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [MAX-AMSDU-7935]"); return 0; } if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) && !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [DSSS_CCK-40]"); return 0; } if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) && !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [LSIG-TXOP-PROT]"); return 0; } return 1; } #ifdef CONFIG_IEEE80211AC static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface) { struct hostapd_hw_modes *mode = iface->current_mode; u32 hw = mode->vht_capab; u32 conf = iface->conf->vht_capab; wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x", hw, conf); if (mode->mode == HOSTAPD_MODE_IEEE80211G && iface->conf->bss[0]->vendor_vht && mode->vht_capab == 0 && iface->hw_features) { int i; for (i = 0; i < iface->num_hw_features; i++) { if (iface->hw_features[i].mode == HOSTAPD_MODE_IEEE80211A) { mode = &iface->hw_features[i]; hw = mode->vht_capab; wpa_printf(MSG_DEBUG, "update hw vht capab based on 5 GHz band: 0x%x", hw); break; } } } return ieee80211ac_cap_check(hw, conf); } #endif /* CONFIG_IEEE80211AC */ #ifdef CONFIG_IEEE80211AX static int ieee80211ax_supported_he_capab(struct hostapd_iface *iface) { return 1; } #endif /* CONFIG_IEEE80211AX */ #endif /* CONFIG_IEEE80211N */ int hostapd_check_ht_capab(struct hostapd_iface *iface) { #ifdef CONFIG_IEEE80211N int ret; if (!iface->conf->ieee80211n) return 0; if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211B && iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G && (iface->conf->ht_capab & HT_CAP_INFO_DSSS_CCK40MHZ)) { wpa_printf(MSG_DEBUG, "Disable HT capability [DSSS_CCK-40] on 5 GHz band"); iface->conf->ht_capab &= ~HT_CAP_INFO_DSSS_CCK40MHZ; } if (!ieee80211n_supported_ht_capab(iface)) return -1; #ifdef CONFIG_IEEE80211AX if (iface->conf->ieee80211ax && !ieee80211ax_supported_he_capab(iface)) return -1; #endif /* CONFIG_IEEE80211AX */ #ifdef CONFIG_IEEE80211AC if (iface->conf->ieee80211ac && !ieee80211ac_supported_vht_capab(iface)) return -1; #endif /* CONFIG_IEEE80211AC */ ret = ieee80211n_check_40mhz(iface); if (ret) return ret; if (!ieee80211n_allowed_ht40_channel_pair(iface)) return -1; #endif /* CONFIG_IEEE80211N */ return 0; } int hostapd_check_edmg_capab(struct hostapd_iface *iface) { struct hostapd_hw_modes *mode = iface->hw_features; struct ieee80211_edmg_config edmg; if (!iface->conf->enable_edmg) return 0; hostapd_encode_edmg_chan(iface->conf->enable_edmg, iface->conf->edmg_channel, iface->conf->channel, &edmg); if (mode->edmg.channels && ieee802_edmg_is_allowed(mode->edmg, edmg)) return 0; wpa_printf(MSG_WARNING, "Requested EDMG configuration is not valid"); wpa_printf(MSG_INFO, "EDMG capab: channels 0x%x, bw_config %d", mode->edmg.channels, mode->edmg.bw_config); wpa_printf(MSG_INFO, "Requested EDMG configuration: channels 0x%x, bw_config %d", edmg.channels, edmg.bw_config); return -1; } static int hostapd_is_usable_chan(struct hostapd_iface *iface, int channel, int primary) { struct hostapd_channel_data *chan; if (!iface->current_mode) return 0; chan = hw_get_channel_chan(iface->current_mode, channel, NULL); if (!chan) return 0; if ((primary && chan_pri_allowed(chan)) || (!primary && !(chan->flag & HOSTAPD_CHAN_DISABLED))) return 1; wpa_printf(MSG_INFO, "Channel %d (%s) not allowed for AP mode, flags: 0x%x%s%s", channel, primary ? "primary" : "secondary", chan->flag, chan->flag & HOSTAPD_CHAN_NO_IR ? " NO-IR" : "", chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : ""); return 0; } static int hostapd_is_usable_edmg(struct hostapd_iface *iface) { int i, contiguous = 0; int num_of_enabled = 0; int max_contiguous = 0; struct ieee80211_edmg_config edmg; if (!iface->conf->enable_edmg) return 1; hostapd_encode_edmg_chan(iface->conf->enable_edmg, iface->conf->edmg_channel, iface->conf->channel, &edmg); if (!(edmg.channels & BIT(iface->conf->channel - 1))) return 0; /* 60 GHz channels 1..6 */ for (i = 0; i < 6; i++) { if (edmg.channels & BIT(i)) { contiguous++; num_of_enabled++; } else { contiguous = 0; continue; } /* P802.11ay defines that the total number of subfields * set to one does not exceed 4. */ if (num_of_enabled > 4) return 0; if (!hostapd_is_usable_chan(iface, i + 1, 1)) return 0; if (contiguous > max_contiguous) max_contiguous = contiguous; } /* Check if the EDMG configuration is valid under the limitations * of P802.11ay. */ /* check bw_config against contiguous EDMG channels */ switch (edmg.bw_config) { case EDMG_BW_CONFIG_4: if (!max_contiguous) return 0; break; case EDMG_BW_CONFIG_5: if (max_contiguous < 2) return 0; break; default: return 0; } return 1; } static int hostapd_is_usable_chans(struct hostapd_iface *iface) { int secondary_chan; struct hostapd_channel_data *pri_chan; pri_chan = hw_get_channel_chan(iface->current_mode, iface->conf->channel, NULL); if (!pri_chan) return 0; if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1)) return 0; if (!hostapd_is_usable_edmg(iface)) return 0; if (!iface->conf->secondary_channel) return 1; if (!iface->conf->ht40_plus_minus_allowed) return hostapd_is_usable_chan( iface, iface->conf->channel + iface->conf->secondary_channel * 4, 0); /* Both HT40+ and HT40- are set, pick a valid secondary channel */ secondary_chan = iface->conf->channel + 4; if (hostapd_is_usable_chan(iface, secondary_chan, 0) && (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P)) { iface->conf->secondary_channel = 1; return 1; } secondary_chan = iface->conf->channel - 4; if (hostapd_is_usable_chan(iface, secondary_chan, 0) && (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40M)) { iface->conf->secondary_channel = -1; return 1; } return 0; } static enum hostapd_chan_status hostapd_check_chans(struct hostapd_iface *iface) { if (iface->conf->channel) { if (hostapd_is_usable_chans(iface)) return HOSTAPD_CHAN_VALID; else return HOSTAPD_CHAN_INVALID; } /* * The user set channel=0 or channel=acs_survey * which is used to trigger ACS. */ switch (acs_init(iface)) { case HOSTAPD_CHAN_ACS: return HOSTAPD_CHAN_ACS; case HOSTAPD_CHAN_VALID: case HOSTAPD_CHAN_INVALID: default: return HOSTAPD_CHAN_INVALID; } } static void hostapd_notify_bad_chans(struct hostapd_iface *iface) { if (!iface->current_mode) { hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, HOSTAPD_LEVEL_WARNING, "Hardware does not support configured mode"); return; } hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, HOSTAPD_LEVEL_WARNING, "Configured channel (%d) not found from the " "channel list of current mode (%d) %s", iface->conf->channel, iface->current_mode->mode, hostapd_hw_mode_txt(iface->current_mode->mode)); hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, HOSTAPD_LEVEL_WARNING, "Hardware does not support configured channel"); } int hostapd_acs_completed(struct hostapd_iface *iface, int err) { int ret = -1; if (err) goto out; switch (hostapd_check_chans(iface)) { case HOSTAPD_CHAN_VALID: wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_COMPLETED "freq=%d channel=%d", hostapd_hw_get_freq(iface->bss[0], iface->conf->channel), iface->conf->channel); break; case HOSTAPD_CHAN_ACS: wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available"); wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED); hostapd_notify_bad_chans(iface); goto out; case HOSTAPD_CHAN_INVALID: default: wpa_printf(MSG_ERROR, "ACS picked unusable channels"); wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED); hostapd_notify_bad_chans(iface); goto out; } ret = hostapd_check_ht_capab(iface); if (ret < 0) goto out; if (ret == 1) { wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback"); return 0; } ret = 0; out: return hostapd_setup_interface_complete(iface, ret); } /** * hostapd_select_hw_mode - Select the hardware mode * @iface: Pointer to interface data. * Returns: 0 on success, < 0 on failure * * Sets up the hardware mode, channel, rates, and passive scanning * based on the configuration. */ int hostapd_select_hw_mode(struct hostapd_iface *iface) { int i; int freq = -1; if (iface->num_hw_features < 1) return -1; if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G || iface->conf->ieee80211n || iface->conf->ieee80211ac || iface->conf->ieee80211ax) && iface->conf->channel == 14) { wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT/HE on channel 14"); iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B; iface->conf->ieee80211n = 0; iface->conf->ieee80211ac = 0; iface->conf->ieee80211ax = 0; } iface->current_mode = NULL; if (iface->conf->channel && iface->conf->op_class) freq = ieee80211_chan_to_freq(NULL, iface->conf->op_class, iface->conf->channel); for (i = 0; i < iface->num_hw_features; i++) { struct hostapd_hw_modes *mode = &iface->hw_features[i]; if (mode->mode == iface->conf->hw_mode) { if (freq > 0 && !hw_get_chan(mode, freq)) continue; iface->current_mode = mode; break; } } if (iface->current_mode == NULL) { if (!(iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) || !(iface->drv_flags & WPA_DRIVER_FLAGS_SUPPORT_HW_MODE_ANY)) { wpa_printf(MSG_ERROR, "Hardware does not support configured mode"); hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, HOSTAPD_LEVEL_WARNING, "Hardware does not support configured mode (%d) (hw_mode in hostapd.conf)", (int) iface->conf->hw_mode); return -2; } } switch (hostapd_check_chans(iface)) { case HOSTAPD_CHAN_VALID: return 0; case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */ return 1; case HOSTAPD_CHAN_INVALID: default: hostapd_notify_bad_chans(iface); return -3; } } const char * hostapd_hw_mode_txt(int mode) { switch (mode) { case HOSTAPD_MODE_IEEE80211A: return "IEEE 802.11a"; case HOSTAPD_MODE_IEEE80211B: return "IEEE 802.11b"; case HOSTAPD_MODE_IEEE80211G: return "IEEE 802.11g"; case HOSTAPD_MODE_IEEE80211AD: return "IEEE 802.11ad"; default: return "UNKNOWN"; } } int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan) { return hw_get_freq(hapd->iface->current_mode, chan); } int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq) { int i, channel; struct hostapd_hw_modes *mode; if (hapd->iface->current_mode) { channel = hw_get_chan(hapd->iface->current_mode, freq); if (channel) return channel; } /* Check other available modes since the channel list for the current * mode did not include the specified frequency. */ if (!hapd->iface->hw_features) return 0; for (i = 0; i < hapd->iface->num_hw_features; i++) { mode = &hapd->iface->hw_features[i]; channel = hw_get_chan(mode, freq); if (channel) return channel; } return 0; }