| /* |
| * 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 <j@w1.fi> |
| * |
| * 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 "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 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_20mhz_bss(struct wpa_scan_res *bss, int pri_freq, |
| int start, int end) |
| { |
| struct ieee802_11_elems elems; |
| struct ieee80211_ht_operation *oper; |
| |
| if (bss->freq < start || bss->freq > end || bss->freq == pri_freq) |
| return 0; |
| |
| ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0); |
| if (!elems.ht_capabilities) { |
| wpa_printf(MSG_DEBUG, "Found overlapping legacy BSS: " |
| MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq); |
| return 1; |
| } |
| |
| if (elems.ht_operation && |
| elems.ht_operation_len >= sizeof(*oper)) { |
| oper = (struct ieee80211_ht_operation *) elems.ht_operation; |
| if (oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK) |
| return 0; |
| |
| wpa_printf(MSG_DEBUG, "Found overlapping 20 MHz HT BSS: " |
| MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq); |
| return 1; |
| } |
| return 0; |
| } |
| |
| |
| 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; |
| struct ieee802_11_elems elems; |
| |
| /* Check for overlapping 20 MHz BSS */ |
| if (ieee80211n_check_20mhz_bss(bss, pri_freq, affected_start, |
| affected_end)) { |
| wpa_printf(MSG_DEBUG, |
| "Overlapping 20 MHz BSS is found"); |
| return 0; |
| } |
| |
| 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; |
| } |
| } |
| |
| ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, |
| 0); |
| if (elems.ht_capabilities && |
| elems.ht_capabilities_len >= |
| sizeof(struct ieee80211_ht_capabilities)) { |
| struct ieee80211_ht_capabilities *ht_cap = |
| (struct ieee80211_ht_capabilities *) |
| elems.ht_capabilities; |
| |
| if (le_to_host16(ht_cap->ht_capabilities_info) & |
| HT_CAP_INFO_40MHZ_INTOLERANT) { |
| wpa_printf(MSG_DEBUG, |
| "40 MHz Intolerant is set on channel %d in BSS " |
| MACSTR, pri, MAC2STR(bss->bssid)); |
| return 0; |
| } |
| } |
| } |
| |
| 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); |
| |
| 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; |
| 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; |
| 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 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; |
| |
| 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); |
| |
| 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; |
| } |
| |
| 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; |
| } |