1 files changed, 487 insertions, 0 deletions

diff --git a/hostapd/hw_features.c b/hostapd/hw_features.c
new file mode 100644
index 000000000000..f1288e0931af
--- /dev/null
+++ b/hostapd/hw_features.c
@@ -0,0 +1,487 @@
+/*
+ * hostapd / Hardware feature query and different modes
+ * Copyright 2002-2003, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "hostapd.h"
+#include "hw_features.h"
+#include "driver.h"
+#include "config.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);
+}
+
+
+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];
+		/* set flag for channels we can use in current regulatory
+		 * domain */
+		for (j = 0; j < feature->num_channels; j++) {
+			/*
+			 * Disable all channels that are marked not to allow
+			 * IBSS operation or active scanning. In addition,
+			 * disable all channels that require radar detection,
+			 * since that (in addition to full DFS) is not yet
+			 * supported.
+			 */
+			if (feature->channels[j].flag &
+			    (HOSTAPD_CHAN_NO_IBSS |
+			     HOSTAPD_CHAN_PASSIVE_SCAN |
+			     HOSTAPD_CHAN_RADAR))
+				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",
+				   feature->mode,
+				   feature->channels[j].chan,
+				   feature->channels[j].freq,
+				   feature->channels[j].max_tx_power);
+		}
+	}
+
+	return ret;
+}
+
+
+static int hostapd_prepare_rates(struct hostapd_data *hapd,
+				 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 (hapd->iconf->basic_rates)
+		basic_rates = hapd->iconf->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;
+	default:
+		return -1;
+	}
+
+	if (hostapd_set_rate_sets(hapd, hapd->iconf->supported_rates,
+				  basic_rates, mode->mode)) {
+		wpa_printf(MSG_ERROR, "Failed to update rate sets in kernel "
+			   "module");
+	}
+
+	os_free(hapd->iface->current_rates);
+	hapd->iface->num_rates = 0;
+
+	hapd->iface->current_rates =
+		os_malloc(mode->num_rates * sizeof(struct hostapd_rate_data));
+	if (!hapd->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 (hapd->iconf->supported_rates &&
+		    !hostapd_rate_found(hapd->iconf->supported_rates,
+					mode->rates[i].rate))
+			continue;
+
+		rate = &hapd->iface->current_rates[hapd->iface->num_rates];
+		os_memcpy(rate, &mode->rates[i],
+			  sizeof(struct hostapd_rate_data));
+		if (hostapd_rate_found(basic_rates, rate->rate)) {
+			rate->flags |= HOSTAPD_RATE_BASIC;
+			num_basic_rates++;
+		} else
+			rate->flags &= ~HOSTAPD_RATE_BASIC;
+		wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
+			   hapd->iface->num_rates, rate->rate, rate->flags);
+		hapd->iface->num_rates++;
+	}
+
+	if (hapd->iface->num_rates == 0 || num_basic_rates == 0) {
+		wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
+			   "rate sets (%d,%d).",
+			   hapd->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 < 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 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 */
+
+
+/**
+ * hostapd_select_hw_mode - Select the hardware mode
+ * @iface: Pointer to interface data.
+ * Returns: 0 on success, -1 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, j, ok, ret;
+
+	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) {
+			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)", (int) iface->conf->hw_mode);
+		return -1;
+	}
+
+	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 == iface->conf->channel)) {
+			ok = 1;
+			break;
+		}
+	}
+	if (ok == 0 && iface->conf->channel != 0) {
+		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));
+		iface->current_mode = NULL;
+	}
+
+	if (iface->current_mode == NULL) {
+		hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
+			       HOSTAPD_LEVEL_WARNING,
+			       "Hardware does not support configured channel");
+		return -1;
+	}
+
+#ifdef CONFIG_IEEE80211N
+	if (!ieee80211n_allowed_ht40_channel_pair(iface))
+		return -1;
+	if (!ieee80211n_supported_ht_capab(iface))
+		return -1;
+#endif /* CONFIG_IEEE80211N */
+
+	if (hostapd_prepare_rates(iface->bss[0], iface->current_mode)) {
+		wpa_printf(MSG_ERROR, "Failed to prepare rates table.");
+		hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
+					   HOSTAPD_LEVEL_WARNING,
+					   "Failed to prepare rates table.");
+		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;
+}
+
+
+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";
+	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;
+}