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-rw-r--r--contrib/hostapd/hw_features.c429
1 files changed, 429 insertions, 0 deletions
diff --git a/contrib/hostapd/hw_features.c b/contrib/hostapd/hw_features.c
new file mode 100644
index 0000000..484959f
--- /dev/null
+++ b/contrib/hostapd/hw_features.c
@@ -0,0 +1,429 @@
+/*
+ * hostapd / Hardware feature query and different modes
+ * Copyright 2002-2003, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ *
+ * 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"
+#include "ieee802_11.h"
+#include "eloop.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++) {
+ free(hw_features[i].channels);
+ free(hw_features[i].rates);
+ }
+
+ 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;
+
+ 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++) {
+ /* TODO: add regulatory domain lookup */
+ unsigned char power_level = 0;
+ unsigned char antenna_max = 0;
+
+ if ((feature->mode == HOSTAPD_MODE_IEEE80211G ||
+ feature->mode == HOSTAPD_MODE_IEEE80211B) &&
+ feature->channels[j].chan >= 1 &&
+ feature->channels[j].chan <= 11) {
+ power_level = 20;
+ feature->channels[j].flag |=
+ HOSTAPD_CHAN_W_SCAN;
+ } else
+ feature->channels[j].flag &=
+ ~HOSTAPD_CHAN_W_SCAN;
+
+ hostapd_set_channel_flag(hapd, feature->mode,
+ feature->channels[j].chan,
+ feature->channels[j].flag,
+ power_level,
+ antenna_max);
+ }
+ }
+
+ 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)) {
+ printf("Failed to update rate sets in kernel module\n");
+ }
+
+ free(hapd->iface->current_rates);
+ hapd->iface->num_rates = 0;
+
+ hapd->iface->current_rates =
+ malloc(mode->num_rates * sizeof(struct hostapd_rate_data));
+ if (!hapd->iface->current_rates) {
+ printf("Failed to allocate memory for rate table.\n");
+ 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];
+ 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;
+ HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
+ "RATE[%d] rate=%d flags=0x%x\n",
+ hapd->iface->num_rates, rate->rate, rate->flags);
+ hapd->iface->num_rates++;
+ }
+
+ if (hapd->iface->num_rates == 0 || num_basic_rates == 0) {
+ printf("No rates remaining in supported/basic rate sets "
+ "(%d,%d).\n", hapd->iface->num_rates, num_basic_rates);
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static void select_hw_mode_start(void *eloop_data, void *user_ctx);
+static void select_hw_mode2_handler(void *eloop_data, void *user_ctx);
+
+/**
+ * select_hw_mode_finalize - Finish select HW mode & call the callback
+ * @iface: Pointer to interface data.
+ * @status: Status of the select HW mode (0 on success; -1 on failure).
+ * Returns: 0 on success; -1 on failure (e.g., was not in progress).
+ */
+static int select_hw_mode_finalize(struct hostapd_iface *iface, int status)
+{
+ hostapd_iface_cb cb;
+
+ if (!iface->hw_mode_sel_cb)
+ return -1;
+
+ eloop_cancel_timeout(select_hw_mode_start, iface, NULL);
+ eloop_cancel_timeout(select_hw_mode2_handler, iface, NULL);
+
+ cb = iface->hw_mode_sel_cb;
+
+ iface->hw_mode_sel_cb = NULL;
+
+ cb(iface, status);
+
+ return 0;
+}
+
+
+/**
+ * select_hw_mode2 - Select the hardware mode (part 2)
+ * @iface: Pointer to interface data.
+ * @status: Status of auto chanel selection.
+ *
+ * Setup the rates and passive scanning based on the configuration.
+ */
+static void select_hw_mode2(struct hostapd_iface *iface, int status)
+{
+ int ret = status;
+ if (ret)
+ goto fail;
+
+ if (iface->current_mode == NULL) {
+ hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
+ HOSTAPD_LEVEL_WARNING,
+ "Hardware does not support configured channel");
+ ret = -1;
+ goto fail;
+ }
+
+ if (hostapd_prepare_rates(iface->bss[0], iface->current_mode)) {
+ printf("Failed to prepare rates table.\n");
+ hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
+ HOSTAPD_LEVEL_WARNING,
+ "Failed to prepare rates table.");
+ ret = -1;
+ goto fail;
+ }
+
+ 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) {
+ printf("Could not set passive scanning: %s\n", strerror(ret));
+ ret = 0;
+ }
+
+fail:
+ select_hw_mode_finalize(iface, ret);
+}
+
+
+/**
+ * select_hw_mode2_handler - Calls select_hw_mode2 when auto chan isn't used
+ * @eloop_data: Stores the struct hostapd_iface * for the interface.
+ * @user_ctx: Unused.
+ */
+static void select_hw_mode2_handler(void *eloop_data, void *user_ctx)
+{
+ struct hostapd_iface *iface = eloop_data;
+
+ select_hw_mode2(iface, 0);
+}
+
+
+/**
+ * select_hw_mode1 - Select the hardware mode (part 1)
+ * @iface: Pointer to interface data.
+ * Returns: 0 on success; -1 on failure.
+ *
+ * Setup the hardware mode and channel based on the configuration.
+ * Schedules select_hw_mode2() to be called immediately or after automatic
+ * channel selection takes place.
+ */
+static int select_hw_mode1(struct hostapd_iface *iface)
+{
+ 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) {
+ iface->current_mode = mode;
+ break;
+ }
+ }
+
+ if (iface->current_mode == NULL) {
+ printf("Hardware does not support configured mode\n");
+ 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_W_SCAN) &&
+ (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;
+ }
+
+ /*
+ * Calls select_hw_mode2() via a handler, so that the function is
+ * always executed from eloop.
+ */
+ eloop_register_timeout(0, 0, select_hw_mode2_handler, iface, NULL);
+ return 0;
+}
+
+
+/**
+ * select_hw_mode_start - Handler to start select HW mode
+ * @eloop_data: Stores the struct hostapd_iface * for the interface.
+ * @user_ctx: Unused.
+ *
+ * An eloop handler is used so that all errors can be processed by the
+ * callback without introducing stack recursion.
+ */
+static void select_hw_mode_start(void *eloop_data, void *user_ctx)
+{
+ struct hostapd_iface *iface = (struct hostapd_iface *)eloop_data;
+
+ int ret;
+
+ ret = select_hw_mode1(iface);
+ if (ret)
+ select_hw_mode_finalize(iface, ret);
+}
+
+
+/**
+ * hostapd_select_hw_mode_start - Start selection of the hardware mode
+ * @iface: Pointer to interface data.
+ * @cb: The function to callback when done.
+ * Returns: 0 if it starts successfully; cb will be called when done.
+ * -1 on failure; cb will not be called.
+ *
+ * Sets up the hardware mode, channel, rates, and passive scanning
+ * based on the configuration.
+ */
+int hostapd_select_hw_mode_start(struct hostapd_iface *iface,
+ hostapd_iface_cb cb)
+{
+ if (iface->hw_mode_sel_cb) {
+ wpa_printf(MSG_DEBUG,
+ "%s: Hardware mode select already in progress.",
+ iface->bss[0]->conf->iface);
+ return -1;
+ }
+
+ iface->hw_mode_sel_cb = cb;
+
+ eloop_register_timeout(0, 0, select_hw_mode_start, iface, NULL);
+
+ return 0;
+}
+
+
+/**
+ * hostapd_auto_chan_select_stop - Stops automatic channel selection
+ * @iface: Pointer to interface data.
+ * Returns: 0 if successfully stopped;
+ * -1 on failure (i.e., was not in progress)
+ */
+int hostapd_select_hw_mode_stop(struct hostapd_iface *iface)
+{
+ return select_hw_mode_finalize(iface, -1);
+}
+
+
+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;
+}
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