/* * 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 "hostapd.h" #include "ap_config.h" #include "ap_drv_ops.h" #include "acs.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 ret = 0, i, j; u16 num_modes, flags; struct hostapd_hw_modes *modes; if (hostapd_drv_none(hapd)) return -1; modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags); 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; 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 * IBSS operation or active scanning. * 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_IBSS | HOSTAPD_CHAN_PASSIVE_SCAN))) { 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 ret; } 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 sec_chan, ok, j, first; int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157, 184, 192 }; size_t k; if (!iface->conf->secondary_channel) return 1; /* HT40 not used */ sec_chan = iface->conf->channel + iface->conf->secondary_channel * 4; wpa_printf(MSG_DEBUG, "HT40: control channel: %d " "secondary channel: %d", iface->conf->channel, sec_chan); /* Verify that HT40 secondary channel is an allowed 20 MHz * channel */ ok = 0; for (j = 0; j < iface->current_mode->num_channels; j++) { struct hostapd_channel_data *chan = &iface->current_mode->channels[j]; if (!(chan->flag & HOSTAPD_CHAN_DISABLED) && chan->chan == sec_chan) { ok = 1; break; } } if (!ok) { wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed", sec_chan); return 0; } /* * Verify that HT40 primary,secondary channel pair is allowed per * IEEE 802.11n Annex J. This is only needed for 5 GHz band since * 2.4 GHz rules allow all cases where the secondary channel fits into * the list of allowed channels (already checked above). */ if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A) return 1; if (iface->conf->secondary_channel > 0) first = iface->conf->channel; else first = sec_chan; ok = 0; for (k = 0; k < ARRAY_SIZE(allowed); k++) { if (first == allowed[k]) { ok = 1; break; } } if (!ok) { wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed", iface->conf->channel, iface->conf->secondary_channel); return 0; } return 1; } 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 void ieee80211n_get_pri_sec_chan(struct wpa_scan_res *bss, int *pri_chan, int *sec_chan) { struct ieee80211_ht_operation *oper; struct ieee802_11_elems elems; *pri_chan = *sec_chan = 0; ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0); if (elems.ht_operation && elems.ht_operation_len >= sizeof(*oper)) { oper = (struct ieee80211_ht_operation *) elems.ht_operation; *pri_chan = oper->primary_chan; if (oper->ht_param & HT_INFO_HT_PARAM_STA_CHNL_WIDTH) { int sec = oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK; if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE) *sec_chan = *pri_chan + 4; else if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW) *sec_chan = *pri_chan - 4; } } } static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface, struct wpa_scan_results *scan_res) { int pri_chan, sec_chan, pri_freq, sec_freq, pri_bss, sec_bss; int bss_pri_chan, bss_sec_chan; size_t i; int match; pri_chan = iface->conf->channel; sec_chan = pri_chan + iface->conf->secondary_channel * 4; pri_freq = hostapd_hw_get_freq(iface->bss[0], pri_chan); if (iface->conf->secondary_channel > 0) sec_freq = pri_freq + 20; else sec_freq = pri_freq - 20; /* * Switch PRI/SEC channels if Beacons were detected on selected SEC * channel, but not on selected PRI channel. */ pri_bss = sec_bss = 0; for (i = 0; i < scan_res->num; i++) { struct wpa_scan_res *bss = scan_res->res[i]; if (bss->freq == pri_freq) pri_bss++; else if (bss->freq == sec_freq) sec_bss++; } if (sec_bss && !pri_bss) { wpa_printf(MSG_INFO, "Switch own primary and secondary " "channel to get secondary channel with no Beacons " "from other BSSes"); ieee80211n_switch_pri_sec(iface); return 1; } /* * Match PRI/SEC channel with any existing HT40 BSS on the same * channels that we are about to use (if already mixed order in * existing BSSes, use own preference). */ match = 0; for (i = 0; i < scan_res->num; i++) { struct wpa_scan_res *bss = scan_res->res[i]; ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan); if (pri_chan == bss_pri_chan && sec_chan == bss_sec_chan) { match = 1; break; } } if (!match) { for (i = 0; i < scan_res->num; i++) { struct wpa_scan_res *bss = scan_res->res[i]; ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan); if (pri_chan == bss_sec_chan && sec_chan == bss_pri_chan) { wpa_printf(MSG_INFO, "Switch own primary and " "secondary channel due to BSS " "overlap with " MACSTR, MAC2STR(bss->bssid)); ieee80211n_switch_pri_sec(iface); break; } } } return 1; } static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface, struct wpa_scan_results *scan_res) { int pri_freq, sec_freq; int affected_start, affected_end; size_t i; 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; affected_start = (pri_freq + sec_freq) / 2 - 25; affected_end = (pri_freq + sec_freq) / 2 + 25; wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", affected_start, affected_end); for (i = 0; i < scan_res->num; i++) { struct wpa_scan_res *bss = scan_res->res[i]; int pri = bss->freq; int sec = pri; int sec_chan, pri_chan; ieee80211n_get_pri_sec_chan(bss, &pri_chan, &sec_chan); if (sec_chan) { if (sec_chan < pri_chan) sec = pri - 20; else sec = pri + 20; } if ((pri < affected_start || pri > affected_end) && (sec < affected_start || sec > affected_end)) continue; /* not within affected channel range */ wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR " freq=%d pri=%d sec=%d", MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan); if (sec_chan) { if (pri_freq != pri || sec_freq != sec) { wpa_printf(MSG_DEBUG, "40 MHz pri/sec " "mismatch with BSS " MACSTR " <%d,%d> (chan=%d%c) vs. <%d,%d>", MAC2STR(bss->bssid), pri, sec, pri_chan, sec > pri ? '+' : '-', pri_freq, sec_freq); return 0; } } /* TODO: 40 MHz intolerant */ } return 1; } 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); 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; } res = ieee80211n_allowed_ht40_channel_pair(iface); 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; affected_start = (pri_freq + sec_freq) / 2 - 25; affected_end = (pri_freq + sec_freq) / 2 + 25; 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 int ieee80211n_check_40mhz(struct hostapd_iface *iface) { struct wpa_driver_scan_params params; if (!iface->conf->secondary_channel) return 0; /* HT40 not used */ 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); if (hostapd_driver_scan(iface->bss[0], ¶ms) < 0) { wpa_printf(MSG_ERROR, "Failed to request a scan of " "neighboring BSSes"); os_free(params.freqs); return -1; } os_free(params.freqs); 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; } if ((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; } if ((conf & HT_CAP_INFO_SMPS_MASK) != (hw & HT_CAP_INFO_SMPS_MASK) && (conf & HT_CAP_INFO_SMPS_MASK) != HT_CAP_INFO_SMPS_DISABLED) { wpa_printf(MSG_ERROR, "Driver does not support configured " "HT capability [SMPS-*]"); return 0; } 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_cap_check(u32 hw, u32 conf, u32 cap, const char *name) { u32 req_cap = conf & cap; /* * Make sure we support all requested capabilities. * NOTE: We assume that 'cap' represents a capability mask, * not a discrete value. */ if ((hw & req_cap) != req_cap) { wpa_printf(MSG_ERROR, "Driver does not support configured VHT capability [%s]", name); return 0; } return 1; } static int ieee80211ac_cap_check_max(u32 hw, u32 conf, u32 cap, const char *name) { u32 hw_max = hw & cap; u32 conf_val = conf & cap; if (conf_val > hw_max) { int offset = find_first_bit(cap); wpa_printf(MSG_ERROR, "Configured VHT capability [%s] exceeds max value supported by the driver (%d > %d)", name, conf_val >> offset, hw_max >> offset); return 0; } return 1; } static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface) { u32 hw = iface->current_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); #define VHT_CAP_CHECK(cap) \ do { \ if (!ieee80211ac_cap_check(hw, conf, cap, #cap)) \ return 0; \ } while (0) #define VHT_CAP_CHECK_MAX(cap) \ do { \ if (!ieee80211ac_cap_check_max(hw, conf, cap, #cap)) \ return 0; \ } while (0) VHT_CAP_CHECK_MAX(VHT_CAP_MAX_MPDU_LENGTH_MASK); VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ); VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ); VHT_CAP_CHECK(VHT_CAP_RXLDPC); VHT_CAP_CHECK(VHT_CAP_SHORT_GI_80); VHT_CAP_CHECK(VHT_CAP_SHORT_GI_160); VHT_CAP_CHECK(VHT_CAP_TXSTBC); VHT_CAP_CHECK_MAX(VHT_CAP_RXSTBC_MASK); VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMER_CAPABLE); VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMEE_CAPABLE); VHT_CAP_CHECK_MAX(VHT_CAP_BEAMFORMEE_STS_MAX); VHT_CAP_CHECK_MAX(VHT_CAP_SOUNDING_DIMENSION_MAX); VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMER_CAPABLE); VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMEE_CAPABLE); VHT_CAP_CHECK(VHT_CAP_VHT_TXOP_PS); VHT_CAP_CHECK(VHT_CAP_HTC_VHT); VHT_CAP_CHECK_MAX(VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MAX); VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB); VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB); VHT_CAP_CHECK(VHT_CAP_RX_ANTENNA_PATTERN); VHT_CAP_CHECK(VHT_CAP_TX_ANTENNA_PATTERN); #undef VHT_CAP_CHECK #undef VHT_CAP_CHECK_MAX return 1; } #endif /* CONFIG_IEEE80211AC */ #endif /* CONFIG_IEEE80211N */ int hostapd_check_ht_capab(struct hostapd_iface *iface) { #ifdef CONFIG_IEEE80211N int ret; if (!iface->conf->ieee80211n) return 0; if (!ieee80211n_supported_ht_capab(iface)) return -1; #ifdef CONFIG_IEEE80211AC if (!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; } static int hostapd_is_usable_chan(struct hostapd_iface *iface, int channel, int primary) { int i; struct hostapd_channel_data *chan; for (i = 0; i < iface->current_mode->num_channels; i++) { chan = &iface->current_mode->channels[i]; if (chan->chan != channel) continue; if (!(chan->flag & HOSTAPD_CHAN_DISABLED)) return 1; wpa_printf(MSG_DEBUG, "%schannel [%i] (%i) is disabled for use in AP mode, flags: 0x%x%s%s%s", primary ? "" : "Configured HT40 secondary ", i, chan->chan, chan->flag, chan->flag & HOSTAPD_CHAN_NO_IBSS ? " NO-IBSS" : "", chan->flag & HOSTAPD_CHAN_PASSIVE_SCAN ? " PASSIVE-SCAN" : "", chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : ""); } return 0; } static int hostapd_is_usable_chans(struct hostapd_iface *iface) { if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1)) return 0; if (!iface->conf->secondary_channel) return 1; return hostapd_is_usable_chan(iface, iface->conf->channel + iface->conf->secondary_channel * 4, 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) { 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; if (iface->num_hw_features < 1) return -1; if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G || iface->conf->ieee80211n || iface->conf->ieee80211ac) && iface->conf->channel == 14) { wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT on channel 14"); iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B; iface->conf->ieee80211n = 0; iface->conf->ieee80211ac = 0; } iface->current_mode = NULL; 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) { iface->current_mode = mode; break; } } if (iface->current_mode == NULL) { 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) { int i; if (!hapd->iface->current_mode) return 0; for (i = 0; i < hapd->iface->current_mode->num_channels; i++) { struct hostapd_channel_data *ch = &hapd->iface->current_mode->channels[i]; if (ch->chan == chan) return ch->freq; } return 0; } int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq) { int i; if (!hapd->iface->current_mode) return 0; for (i = 0; i < hapd->iface->current_mode->num_channels; i++) { struct hostapd_channel_data *ch = &hapd->iface->current_mode->channels[i]; if (ch->freq == freq) return ch->chan; } return 0; }