#include "includes.h"
#include "hostapd.h"
+#include "ieee802_11_defs.h"
+#include "ieee802_11_common.h"
+#include "eloop.h"
#include "hw_features.h"
-#include "driver.h"
+#include "driver_i.h"
#include "config.h"
if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
continue;
wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
- "chan=%d freq=%d MHz",
+ "chan=%d freq=%d MHz max_tx_power=%d dBm",
feature->mode,
feature->channels[j].chan,
- feature->channels[j].freq);
+ feature->channels[j].freq,
+ feature->channels[j].max_tx_power);
}
}
}
+#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 < sizeof(allowed) / sizeof(allowed[0]); 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->control_chan;
+ if (oper->ht_param & HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH) {
+ if (oper->ht_param &
+ HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
+ *sec_chan = *pri_chan + 4;
+ else if (oper->ht_param &
+ 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 = 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);
+ }
+
+ /*
+ * 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, &pri_chan, &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;
+
+ /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
+ * allowed per IEEE 802.11n/D7.0, 11.14.3.2 */
+
+ 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;
+ iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
+ }
+
+ hostapd_setup_interface_complete(iface, 0);
+}
+
+
+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 */
+
+ wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
+ "40 MHz channel");
+ os_memset(¶ms, 0, sizeof(params));
+ /* TODO: scan only the needed frequency */
+ if (hostapd_driver_scan(iface->bss[0], ¶ms) < 0) {
+ wpa_printf(MSG_ERROR, "Failed to request a scan of "
+ "neighboring BSSes");
+ 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 (!iface->conf->ieee80211n)
+ return 1;
+
+ 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_PSMP_SUPP) && !(hw & HT_CAP_INFO_PSMP_SUPP)) {
+ wpa_printf(MSG_ERROR, "Driver does not support configured "
+ "HT capability [PSMP]");
+ 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;
+}
+
+#endif /* CONFIG_IEEE80211N */
+
+
+int hostapd_check_ht_capab(struct hostapd_iface *iface)
+{
+#ifdef CONFIG_IEEE80211N
+ int ret;
+ ret = ieee80211n_check_40mhz(iface);
+ if (ret)
+ return ret;
+ if (!ieee80211n_allowed_ht40_channel_pair(iface))
+ return -1;
+ if (!ieee80211n_supported_ht_capab(iface))
+ return -1;
+#endif /* CONFIG_IEEE80211N */
+
+ return 0;
+}
+
+
/**
* hostapd_select_hw_mode - Select the hardware mode
* @iface: Pointer to interface data.
*/
int hostapd_select_hw_mode(struct hostapd_iface *iface)
{
- int i, j, ok, ret;
+ int i, j, ok;
if (iface->num_hw_features < 1)
return -1;
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 == (int) iface->conf->hw_mode) {
+ if (mode->mode == iface->conf->hw_mode) {
iface->current_mode = mode;
break;
}
break;
}
}
+ if (iface->conf->channel == 0) {
+ /* TODO: could request a scan of neighboring BSSes and select
+ * the channel automatically */
+ wpa_printf(MSG_ERROR, "Channel not configured "
+ "(hw_mode/channel in hostapd.conf)");
+ return -1;
+ }
if (ok == 0 && iface->conf->channel != 0) {
hostapd_logger(iface->bss[0], NULL,
HOSTAPD_MODULE_IEEE80211,
return -1;
}
- ret = hostapd_passive_scan(iface->bss[0], 0,
- iface->conf->passive_scan_mode,
- iface->conf->passive_scan_interval,
- iface->conf->passive_scan_listen,
- NULL, NULL);
- if (ret) {
- if (ret == -1) {
- wpa_printf(MSG_DEBUG, "Passive scanning not "
- "supported");
- } else {
- wpa_printf(MSG_ERROR, "Could not set passive "
- "scanning: %s", strerror(ret));
- }
- ret = 0;
- }
-
- return ret;
+ return 0;
}
projects / wpasupplicant / blobdiff