--- /dev/null
+/*
+ * DFS - Dynamic Frequency Selection
+ * Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2013-2015, Qualcomm Atheros, Inc.
+ *
+ * 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 "common/ieee802_11_defs.h"
+#include "common/hw_features_common.h"
+#include "common/wpa_ctrl.h"
+#include "hostapd.h"
+#include "ap_drv_ops.h"
+#include "drivers/driver.h"
+#include "dfs.h"
+
+
+static int dfs_get_used_n_chans(struct hostapd_iface *iface, int *seg1)
+{
+ int n_chans = 1;
+
+ *seg1 = 0;
+
+ if (iface->conf->ieee80211n && iface->conf->secondary_channel)
+ n_chans = 2;
+
+ if (iface->conf->ieee80211ac) {
+ switch (iface->conf->vht_oper_chwidth) {
+ case VHT_CHANWIDTH_USE_HT:
+ break;
+ case VHT_CHANWIDTH_80MHZ:
+ n_chans = 4;
+ break;
+ case VHT_CHANWIDTH_160MHZ:
+ n_chans = 8;
+ break;
+ case VHT_CHANWIDTH_80P80MHZ:
+ n_chans = 4;
+ *seg1 = 4;
+ break;
+ default:
+ break;
+ }
+ }
+
+ return n_chans;
+}
+
+
+static int dfs_channel_available(struct hostapd_channel_data *chan,
+ int skip_radar)
+{
+ /*
+ * When radar detection happens, CSA is performed. However, there's no
+ * time for CAC, so radar channels must be skipped when finding a new
+ * channel for CSA, unless they are available for immediate use.
+ */
+ if (skip_radar && (chan->flag & HOSTAPD_CHAN_RADAR) &&
+ ((chan->flag & HOSTAPD_CHAN_DFS_MASK) !=
+ HOSTAPD_CHAN_DFS_AVAILABLE))
+ return 0;
+
+ if (chan->flag & HOSTAPD_CHAN_DISABLED)
+ return 0;
+ if ((chan->flag & HOSTAPD_CHAN_RADAR) &&
+ ((chan->flag & HOSTAPD_CHAN_DFS_MASK) ==
+ HOSTAPD_CHAN_DFS_UNAVAILABLE))
+ return 0;
+ return 1;
+}
+
+
+static int dfs_is_chan_allowed(struct hostapd_channel_data *chan, int n_chans)
+{
+ /*
+ * The tables contain first valid channel number based on channel width.
+ * We will also choose this first channel as the control one.
+ */
+ int allowed_40[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
+ 184, 192 };
+ /*
+ * VHT80, valid channels based on center frequency:
+ * 42, 58, 106, 122, 138, 155
+ */
+ int allowed_80[] = { 36, 52, 100, 116, 132, 149 };
+ /*
+ * VHT160 valid channels based on center frequency:
+ * 50, 114
+ */
+ int allowed_160[] = { 36, 100 };
+ int *allowed = allowed_40;
+ unsigned int i, allowed_no = 0;
+
+ switch (n_chans) {
+ case 2:
+ allowed = allowed_40;
+ allowed_no = ARRAY_SIZE(allowed_40);
+ break;
+ case 4:
+ allowed = allowed_80;
+ allowed_no = ARRAY_SIZE(allowed_80);
+ break;
+ case 8:
+ allowed = allowed_160;
+ allowed_no = ARRAY_SIZE(allowed_160);
+ break;
+ default:
+ wpa_printf(MSG_DEBUG, "Unknown width for %d channels", n_chans);
+ break;
+ }
+
+ for (i = 0; i < allowed_no; i++) {
+ if (chan->chan == allowed[i])
+ return 1;
+ }
+
+ return 0;
+}
+
+
+static struct hostapd_channel_data *
+dfs_get_chan_data(struct hostapd_hw_modes *mode, int freq, int first_chan_idx)
+{
+ int i;
+
+ for (i = first_chan_idx; i < mode->num_channels; i++) {
+ if (mode->channels[i].freq == freq)
+ return &mode->channels[i];
+ }
+
+ return NULL;
+}
+
+
+static int dfs_chan_range_available(struct hostapd_hw_modes *mode,
+ int first_chan_idx, int num_chans,
+ int skip_radar)
+{
+ struct hostapd_channel_data *first_chan, *chan;
+ int i;
+
+ if (first_chan_idx + num_chans > mode->num_channels)
+ return 0;
+
+ first_chan = &mode->channels[first_chan_idx];
+
+ for (i = 0; i < num_chans; i++) {
+ chan = dfs_get_chan_data(mode, first_chan->freq + i * 20,
+ first_chan_idx);
+ if (!chan)
+ return 0;
+
+ if (!dfs_channel_available(chan, skip_radar))
+ return 0;
+ }
+
+ return 1;
+}
+
+
+static int is_in_chanlist(struct hostapd_iface *iface,
+ struct hostapd_channel_data *chan)
+{
+ if (!iface->conf->acs_ch_list.num)
+ return 1;
+
+ return freq_range_list_includes(&iface->conf->acs_ch_list, chan->chan);
+}
+
+
+/*
+ * The function assumes HT40+ operation.
+ * Make sure to adjust the following variables after calling this:
+ * - hapd->secondary_channel
+ * - hapd->vht_oper_centr_freq_seg0_idx
+ * - hapd->vht_oper_centr_freq_seg1_idx
+ */
+static int dfs_find_channel(struct hostapd_iface *iface,
+ struct hostapd_channel_data **ret_chan,
+ int idx, int skip_radar)
+{
+ struct hostapd_hw_modes *mode;
+ struct hostapd_channel_data *chan;
+ int i, channel_idx = 0, n_chans, n_chans1;
+
+ mode = iface->current_mode;
+ n_chans = dfs_get_used_n_chans(iface, &n_chans1);
+
+ wpa_printf(MSG_DEBUG, "DFS new chan checking %d channels", n_chans);
+ for (i = 0; i < mode->num_channels; i++) {
+ chan = &mode->channels[i];
+
+ /* Skip HT40/VHT incompatible channels */
+ if (iface->conf->ieee80211n &&
+ iface->conf->secondary_channel &&
+ !dfs_is_chan_allowed(chan, n_chans))
+ continue;
+
+ /* Skip incompatible chandefs */
+ if (!dfs_chan_range_available(mode, i, n_chans, skip_radar))
+ continue;
+
+ if (!is_in_chanlist(iface, chan))
+ continue;
+
+ if (ret_chan && idx == channel_idx) {
+ wpa_printf(MSG_DEBUG, "Selected ch. #%d", chan->chan);
+ *ret_chan = chan;
+ return idx;
+ }
+ wpa_printf(MSG_DEBUG, "Adding channel: %d", chan->chan);
+ channel_idx++;
+ }
+ return channel_idx;
+}
+
+
+static void dfs_adjust_vht_center_freq(struct hostapd_iface *iface,
+ struct hostapd_channel_data *chan,
+ int secondary_channel,
+ u8 *vht_oper_centr_freq_seg0_idx,
+ u8 *vht_oper_centr_freq_seg1_idx)
+{
+ if (!iface->conf->ieee80211ac)
+ return;
+
+ if (!chan)
+ return;
+
+ *vht_oper_centr_freq_seg1_idx = 0;
+
+ switch (iface->conf->vht_oper_chwidth) {
+ case VHT_CHANWIDTH_USE_HT:
+ if (secondary_channel == 1)
+ *vht_oper_centr_freq_seg0_idx = chan->chan + 2;
+ else if (secondary_channel == -1)
+ *vht_oper_centr_freq_seg0_idx = chan->chan - 2;
+ else
+ *vht_oper_centr_freq_seg0_idx = chan->chan;
+ break;
+ case VHT_CHANWIDTH_80MHZ:
+ *vht_oper_centr_freq_seg0_idx = chan->chan + 6;
+ break;
+ case VHT_CHANWIDTH_160MHZ:
+ *vht_oper_centr_freq_seg0_idx = chan->chan + 14;
+ break;
+ default:
+ wpa_printf(MSG_INFO, "DFS only VHT20/40/80/160 is supported now");
+ *vht_oper_centr_freq_seg0_idx = 0;
+ break;
+ }
+
+ wpa_printf(MSG_DEBUG, "DFS adjusting VHT center frequency: %d, %d",
+ *vht_oper_centr_freq_seg0_idx,
+ *vht_oper_centr_freq_seg1_idx);
+}
+
+
+/* Return start channel idx we will use for mode->channels[idx] */
+static int dfs_get_start_chan_idx(struct hostapd_iface *iface, int *seg1_start)
+{
+ struct hostapd_hw_modes *mode;
+ struct hostapd_channel_data *chan;
+ int channel_no = iface->conf->channel;
+ int res = -1, i;
+ int chan_seg1 = -1;
+
+ *seg1_start = -1;
+
+ /* HT40- */
+ if (iface->conf->ieee80211n && iface->conf->secondary_channel == -1)
+ channel_no -= 4;
+
+ /* VHT */
+ if (iface->conf->ieee80211ac) {
+ switch (iface->conf->vht_oper_chwidth) {
+ case VHT_CHANWIDTH_USE_HT:
+ break;
+ case VHT_CHANWIDTH_80MHZ:
+ channel_no =
+ iface->conf->vht_oper_centr_freq_seg0_idx - 6;
+ break;
+ case VHT_CHANWIDTH_160MHZ:
+ channel_no =
+ iface->conf->vht_oper_centr_freq_seg0_idx - 14;
+ break;
+ case VHT_CHANWIDTH_80P80MHZ:
+ channel_no =
+ iface->conf->vht_oper_centr_freq_seg0_idx - 6;
+ chan_seg1 =
+ iface->conf->vht_oper_centr_freq_seg1_idx - 6;
+ break;
+ default:
+ wpa_printf(MSG_INFO,
+ "DFS only VHT20/40/80/160/80+80 is supported now");
+ channel_no = -1;
+ break;
+ }
+ }
+
+ /* Get idx */
+ mode = iface->current_mode;
+ for (i = 0; i < mode->num_channels; i++) {
+ chan = &mode->channels[i];
+ if (chan->chan == channel_no) {
+ res = i;
+ break;
+ }
+ }
+
+ if (res != -1 && chan_seg1 > -1) {
+ int found = 0;
+
+ /* Get idx for seg1 */
+ mode = iface->current_mode;
+ for (i = 0; i < mode->num_channels; i++) {
+ chan = &mode->channels[i];
+ if (chan->chan == chan_seg1) {
+ *seg1_start = i;
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ res = -1;
+ }
+
+ if (res == -1) {
+ wpa_printf(MSG_DEBUG,
+ "DFS chan_idx seems wrong; num-ch: %d ch-no: %d conf-ch-no: %d 11n: %d sec-ch: %d vht-oper-width: %d",
+ mode->num_channels, channel_no, iface->conf->channel,
+ iface->conf->ieee80211n,
+ iface->conf->secondary_channel,
+ iface->conf->vht_oper_chwidth);
+
+ for (i = 0; i < mode->num_channels; i++) {
+ wpa_printf(MSG_DEBUG, "Available channel: %d",
+ mode->channels[i].chan);
+ }
+ }
+
+ return res;
+}
+
+
+/* At least one channel have radar flag */
+static int dfs_check_chans_radar(struct hostapd_iface *iface,
+ int start_chan_idx, int n_chans)
+{
+ struct hostapd_channel_data *channel;
+ struct hostapd_hw_modes *mode;
+ int i, res = 0;
+
+ mode = iface->current_mode;
+
+ for (i = 0; i < n_chans; i++) {
+ channel = &mode->channels[start_chan_idx + i];
+ if (channel->flag & HOSTAPD_CHAN_RADAR)
+ res++;
+ }
+
+ return res;
+}
+
+
+/* All channels available */
+static int dfs_check_chans_available(struct hostapd_iface *iface,
+ int start_chan_idx, int n_chans)
+{
+ struct hostapd_channel_data *channel;
+ struct hostapd_hw_modes *mode;
+ int i;
+
+ mode = iface->current_mode;
+
+ for (i = 0; i < n_chans; i++) {
+ channel = &mode->channels[start_chan_idx + i];
+
+ if (channel->flag & HOSTAPD_CHAN_DISABLED)
+ break;
+
+ if (!(channel->flag & HOSTAPD_CHAN_RADAR))
+ continue;
+
+ if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) !=
+ HOSTAPD_CHAN_DFS_AVAILABLE)
+ break;
+ }
+
+ return i == n_chans;
+}
+
+
+/* At least one channel unavailable */
+static int dfs_check_chans_unavailable(struct hostapd_iface *iface,
+ int start_chan_idx,
+ int n_chans)
+{
+ struct hostapd_channel_data *channel;
+ struct hostapd_hw_modes *mode;
+ int i, res = 0;
+
+ mode = iface->current_mode;
+
+ for (i = 0; i < n_chans; i++) {
+ channel = &mode->channels[start_chan_idx + i];
+ if (channel->flag & HOSTAPD_CHAN_DISABLED)
+ res++;
+ if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) ==
+ HOSTAPD_CHAN_DFS_UNAVAILABLE)
+ res++;
+ }
+
+ return res;
+}
+
+
+static struct hostapd_channel_data *
+dfs_get_valid_channel(struct hostapd_iface *iface,
+ int *secondary_channel,
+ u8 *vht_oper_centr_freq_seg0_idx,
+ u8 *vht_oper_centr_freq_seg1_idx,
+ int skip_radar)
+{
+ struct hostapd_hw_modes *mode;
+ struct hostapd_channel_data *chan = NULL;
+ int num_available_chandefs;
+ int chan_idx;
+ u32 _rand;
+
+ wpa_printf(MSG_DEBUG, "DFS: Selecting random channel");
+ *secondary_channel = 0;
+ *vht_oper_centr_freq_seg0_idx = 0;
+ *vht_oper_centr_freq_seg1_idx = 0;
+
+ if (iface->current_mode == NULL)
+ return NULL;
+
+ mode = iface->current_mode;
+ if (mode->mode != HOSTAPD_MODE_IEEE80211A)
+ return NULL;
+
+ /* Get the count first */
+ num_available_chandefs = dfs_find_channel(iface, NULL, 0, skip_radar);
+ if (num_available_chandefs == 0)
+ return NULL;
+
+ if (os_get_random((u8 *) &_rand, sizeof(_rand)) < 0)
+ return NULL;
+ chan_idx = _rand % num_available_chandefs;
+ dfs_find_channel(iface, &chan, chan_idx, skip_radar);
+
+ /* dfs_find_channel() calculations assume HT40+ */
+ if (iface->conf->secondary_channel)
+ *secondary_channel = 1;
+ else
+ *secondary_channel = 0;
+
+ dfs_adjust_vht_center_freq(iface, chan,
+ *secondary_channel,
+ vht_oper_centr_freq_seg0_idx,
+ vht_oper_centr_freq_seg1_idx);
+
+ return chan;
+}
+
+
+static int set_dfs_state_freq(struct hostapd_iface *iface, int freq, u32 state)
+{
+ struct hostapd_hw_modes *mode;
+ struct hostapd_channel_data *chan = NULL;
+ int i;
+
+ mode = iface->current_mode;
+ if (mode == NULL)
+ return 0;
+
+ wpa_printf(MSG_DEBUG, "set_dfs_state 0x%X for %d MHz", state, freq);
+ for (i = 0; i < iface->current_mode->num_channels; i++) {
+ chan = &iface->current_mode->channels[i];
+ if (chan->freq == freq) {
+ if (chan->flag & HOSTAPD_CHAN_RADAR) {
+ chan->flag &= ~HOSTAPD_CHAN_DFS_MASK;
+ chan->flag |= state;
+ return 1; /* Channel found */
+ }
+ }
+ }
+ wpa_printf(MSG_WARNING, "Can't set DFS state for freq %d MHz", freq);
+ return 0;
+}
+
+
+static int set_dfs_state(struct hostapd_iface *iface, int freq, int ht_enabled,
+ int chan_offset, int chan_width, int cf1,
+ int cf2, u32 state)
+{
+ int n_chans = 1, i;
+ struct hostapd_hw_modes *mode;
+ int frequency = freq;
+ int ret = 0;
+
+ mode = iface->current_mode;
+ if (mode == NULL)
+ return 0;
+
+ if (mode->mode != HOSTAPD_MODE_IEEE80211A) {
+ wpa_printf(MSG_WARNING, "current_mode != IEEE80211A");
+ return 0;
+ }
+
+ /* Seems cf1 and chan_width is enough here */
+ switch (chan_width) {
+ case CHAN_WIDTH_20_NOHT:
+ case CHAN_WIDTH_20:
+ n_chans = 1;
+ if (frequency == 0)
+ frequency = cf1;
+ break;
+ case CHAN_WIDTH_40:
+ n_chans = 2;
+ frequency = cf1 - 10;
+ break;
+ case CHAN_WIDTH_80:
+ n_chans = 4;
+ frequency = cf1 - 30;
+ break;
+ case CHAN_WIDTH_160:
+ n_chans = 8;
+ frequency = cf1 - 70;
+ break;
+ default:
+ wpa_printf(MSG_INFO, "DFS chan_width %d not supported",
+ chan_width);
+ break;
+ }
+
+ wpa_printf(MSG_DEBUG, "DFS freq: %dMHz, n_chans: %d", frequency,
+ n_chans);
+ for (i = 0; i < n_chans; i++) {
+ ret += set_dfs_state_freq(iface, frequency, state);
+ frequency = frequency + 20;
+ }
+
+ return ret;
+}
+
+
+static int dfs_are_channels_overlapped(struct hostapd_iface *iface, int freq,
+ int chan_width, int cf1, int cf2)
+{
+ int start_chan_idx, start_chan_idx1;
+ struct hostapd_hw_modes *mode;
+ struct hostapd_channel_data *chan;
+ int n_chans, n_chans1, i, j, frequency = freq, radar_n_chans = 1;
+ u8 radar_chan;
+ int res = 0;
+
+ /* Our configuration */
+ mode = iface->current_mode;
+ start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1);
+ n_chans = dfs_get_used_n_chans(iface, &n_chans1);
+
+ /* Check we are on DFS channel(s) */
+ if (!dfs_check_chans_radar(iface, start_chan_idx, n_chans))
+ return 0;
+
+ /* Reported via radar event */
+ switch (chan_width) {
+ case CHAN_WIDTH_20_NOHT:
+ case CHAN_WIDTH_20:
+ radar_n_chans = 1;
+ if (frequency == 0)
+ frequency = cf1;
+ break;
+ case CHAN_WIDTH_40:
+ radar_n_chans = 2;
+ frequency = cf1 - 10;
+ break;
+ case CHAN_WIDTH_80:
+ radar_n_chans = 4;
+ frequency = cf1 - 30;
+ break;
+ case CHAN_WIDTH_160:
+ radar_n_chans = 8;
+ frequency = cf1 - 70;
+ break;
+ default:
+ wpa_printf(MSG_INFO, "DFS chan_width %d not supported",
+ chan_width);
+ break;
+ }
+
+ ieee80211_freq_to_chan(frequency, &radar_chan);
+
+ for (i = 0; i < n_chans; i++) {
+ chan = &mode->channels[start_chan_idx + i];
+ if (!(chan->flag & HOSTAPD_CHAN_RADAR))
+ continue;
+ for (j = 0; j < radar_n_chans; j++) {
+ wpa_printf(MSG_DEBUG, "checking our: %d, radar: %d",
+ chan->chan, radar_chan + j * 4);
+ if (chan->chan == radar_chan + j * 4)
+ res++;
+ }
+ }
+
+ wpa_printf(MSG_DEBUG, "overlapped: %d", res);
+
+ return res;
+}
+
+
+static unsigned int dfs_get_cac_time(struct hostapd_iface *iface,
+ int start_chan_idx, int n_chans)
+{
+ struct hostapd_channel_data *channel;
+ struct hostapd_hw_modes *mode;
+ int i;
+ unsigned int cac_time_ms = 0;
+
+ mode = iface->current_mode;
+
+ for (i = 0; i < n_chans; i++) {
+ channel = &mode->channels[start_chan_idx + i];
+ if (!(channel->flag & HOSTAPD_CHAN_RADAR))
+ continue;
+ if (channel->dfs_cac_ms > cac_time_ms)
+ cac_time_ms = channel->dfs_cac_ms;
+ }
+
+ return cac_time_ms;
+}
+
+
+/*
+ * Main DFS handler
+ * 1 - continue channel/ap setup
+ * 0 - channel/ap setup will be continued after CAC
+ * -1 - hit critical error
+ */
+int hostapd_handle_dfs(struct hostapd_iface *iface)
+{
+ struct hostapd_channel_data *channel;
+ int res, n_chans, n_chans1, start_chan_idx, start_chan_idx1;
+ int skip_radar = 0;
+
+ if (!iface->current_mode) {
+ /*
+ * This can happen with drivers that do not provide mode
+ * information and as such, cannot really use hostapd for DFS.
+ */
+ wpa_printf(MSG_DEBUG,
+ "DFS: No current_mode information - assume no need to perform DFS operations by hostapd");
+ return 1;
+ }
+
+ iface->cac_started = 0;
+
+ do {
+ /* Get start (first) channel for current configuration */
+ start_chan_idx = dfs_get_start_chan_idx(iface,
+ &start_chan_idx1);
+ if (start_chan_idx == -1)
+ return -1;
+
+ /* Get number of used channels, depend on width */
+ n_chans = dfs_get_used_n_chans(iface, &n_chans1);
+
+ /* Setup CAC time */
+ iface->dfs_cac_ms = dfs_get_cac_time(iface, start_chan_idx,
+ n_chans);
+
+ /* Check if any of configured channels require DFS */
+ res = dfs_check_chans_radar(iface, start_chan_idx, n_chans);
+ wpa_printf(MSG_DEBUG,
+ "DFS %d channels required radar detection",
+ res);
+ if (!res)
+ return 1;
+
+ /* Check if all channels are DFS available */
+ res = dfs_check_chans_available(iface, start_chan_idx, n_chans);
+ wpa_printf(MSG_DEBUG,
+ "DFS all channels available, (SKIP CAC): %s",
+ res ? "yes" : "no");
+ if (res)
+ return 1;
+
+ /* Check if any of configured channels is unavailable */
+ res = dfs_check_chans_unavailable(iface, start_chan_idx,
+ n_chans);
+ wpa_printf(MSG_DEBUG, "DFS %d chans unavailable - choose other channel: %s",
+ res, res ? "yes": "no");
+ if (res) {
+ int sec = 0;
+ u8 cf1 = 0, cf2 = 0;
+
+ channel = dfs_get_valid_channel(iface, &sec, &cf1, &cf2,
+ skip_radar);
+ if (!channel) {
+ wpa_printf(MSG_ERROR, "could not get valid channel");
+ hostapd_set_state(iface, HAPD_IFACE_DFS);
+ return 0;
+ }
+
+ iface->freq = channel->freq;
+ iface->conf->channel = channel->chan;
+ iface->conf->secondary_channel = sec;
+ iface->conf->vht_oper_centr_freq_seg0_idx = cf1;
+ iface->conf->vht_oper_centr_freq_seg1_idx = cf2;
+ }
+ } while (res);
+
+ /* Finally start CAC */
+ hostapd_set_state(iface, HAPD_IFACE_DFS);
+ wpa_printf(MSG_DEBUG, "DFS start CAC on %d MHz", iface->freq);
+ wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START
+ "freq=%d chan=%d sec_chan=%d, width=%d, seg0=%d, seg1=%d, cac_time=%ds",
+ iface->freq,
+ iface->conf->channel, iface->conf->secondary_channel,
+ iface->conf->vht_oper_chwidth,
+ iface->conf->vht_oper_centr_freq_seg0_idx,
+ iface->conf->vht_oper_centr_freq_seg1_idx,
+ iface->dfs_cac_ms / 1000);
+
+ res = hostapd_start_dfs_cac(iface, iface->conf->hw_mode,
+ iface->freq,
+ iface->conf->channel,
+ iface->conf->ieee80211n,
+ iface->conf->ieee80211ac,
+ iface->conf->secondary_channel,
+ iface->conf->vht_oper_chwidth,
+ iface->conf->vht_oper_centr_freq_seg0_idx,
+ iface->conf->vht_oper_centr_freq_seg1_idx);
+
+ if (res) {
+ wpa_printf(MSG_ERROR, "DFS start_dfs_cac() failed, %d", res);
+ return -1;
+ }
+
+ return 0;
+}
+
+
+int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq,
+ int ht_enabled, int chan_offset, int chan_width,
+ int cf1, int cf2)
+{
+ wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_COMPLETED
+ "success=%d freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d",
+ success, freq, ht_enabled, chan_offset, chan_width, cf1, cf2);
+
+ if (success) {
+ /* Complete iface/ap configuration */
+ if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) {
+ /* Complete AP configuration for the first bring up. */
+ if (iface->state != HAPD_IFACE_ENABLED)
+ hostapd_setup_interface_complete(iface, 0);
+ else
+ iface->cac_started = 0;
+ } else {
+ set_dfs_state(iface, freq, ht_enabled, chan_offset,
+ chan_width, cf1, cf2,
+ HOSTAPD_CHAN_DFS_AVAILABLE);
+ iface->cac_started = 0;
+ hostapd_setup_interface_complete(iface, 0);
+ }
+ }
+
+ return 0;
+}
+
+
+static int hostapd_dfs_start_channel_switch_cac(struct hostapd_iface *iface)
+{
+ struct hostapd_channel_data *channel;
+ int secondary_channel;
+ u8 vht_oper_centr_freq_seg0_idx = 0;
+ u8 vht_oper_centr_freq_seg1_idx = 0;
+ int skip_radar = 0;
+ int err = 1;
+
+ /* Radar detected during active CAC */
+ iface->cac_started = 0;
+ channel = dfs_get_valid_channel(iface, &secondary_channel,
+ &vht_oper_centr_freq_seg0_idx,
+ &vht_oper_centr_freq_seg1_idx,
+ skip_radar);
+
+ if (!channel) {
+ wpa_printf(MSG_ERROR, "No valid channel available");
+ return err;
+ }
+
+ wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d",
+ channel->chan);
+ wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL
+ "freq=%d chan=%d sec_chan=%d", channel->freq,
+ channel->chan, secondary_channel);
+
+ iface->freq = channel->freq;
+ iface->conf->channel = channel->chan;
+ iface->conf->secondary_channel = secondary_channel;
+ iface->conf->vht_oper_centr_freq_seg0_idx =
+ vht_oper_centr_freq_seg0_idx;
+ iface->conf->vht_oper_centr_freq_seg1_idx =
+ vht_oper_centr_freq_seg1_idx;
+ err = 0;
+
+ hostapd_setup_interface_complete(iface, err);
+ return err;
+}
+
+
+static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface)
+{
+ struct hostapd_channel_data *channel;
+ int secondary_channel;
+ u8 vht_oper_centr_freq_seg0_idx;
+ u8 vht_oper_centr_freq_seg1_idx;
+ int skip_radar = 1;
+ struct csa_settings csa_settings;
+ unsigned int i;
+ int err = 1;
+
+ wpa_printf(MSG_DEBUG, "%s called (CAC active: %s, CSA active: %s)",
+ __func__, iface->cac_started ? "yes" : "no",
+ hostapd_csa_in_progress(iface) ? "yes" : "no");
+
+ /* Check if CSA in progress */
+ if (hostapd_csa_in_progress(iface))
+ return 0;
+
+ /* Check if active CAC */
+ if (iface->cac_started)
+ return hostapd_dfs_start_channel_switch_cac(iface);
+
+ /* Perform channel switch/CSA */
+ channel = dfs_get_valid_channel(iface, &secondary_channel,
+ &vht_oper_centr_freq_seg0_idx,
+ &vht_oper_centr_freq_seg1_idx,
+ skip_radar);
+
+ if (!channel) {
+ /*
+ * If there is no channel to switch immediately to, check if
+ * there is another channel where we can switch even if it
+ * requires to perform a CAC first.
+ */
+ skip_radar = 0;
+ channel = dfs_get_valid_channel(iface, &secondary_channel,
+ &vht_oper_centr_freq_seg0_idx,
+ &vht_oper_centr_freq_seg1_idx,
+ skip_radar);
+ if (!channel) {
+ wpa_printf(MSG_INFO,
+ "%s: no DFS channels left, waiting for NOP to finish",
+ __func__);
+ return err;
+ }
+
+ iface->freq = channel->freq;
+ iface->conf->channel = channel->chan;
+ iface->conf->secondary_channel = secondary_channel;
+ iface->conf->vht_oper_centr_freq_seg0_idx =
+ vht_oper_centr_freq_seg0_idx;
+ iface->conf->vht_oper_centr_freq_seg1_idx =
+ vht_oper_centr_freq_seg1_idx;
+
+ hostapd_disable_iface(iface);
+ hostapd_enable_iface(iface);
+ return 0;
+ }
+
+ wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d",
+ channel->chan);
+ wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL
+ "freq=%d chan=%d sec_chan=%d", channel->freq,
+ channel->chan, secondary_channel);
+
+ /* Setup CSA request */
+ os_memset(&csa_settings, 0, sizeof(csa_settings));
+ csa_settings.cs_count = 5;
+ csa_settings.block_tx = 1;
+ err = hostapd_set_freq_params(&csa_settings.freq_params,
+ iface->conf->hw_mode,
+ channel->freq,
+ channel->chan,
+ iface->conf->ieee80211n,
+ iface->conf->ieee80211ac,
+ secondary_channel,
+ iface->conf->vht_oper_chwidth,
+ vht_oper_centr_freq_seg0_idx,
+ vht_oper_centr_freq_seg1_idx,
+ iface->current_mode->vht_capab);
+
+ if (err) {
+ wpa_printf(MSG_ERROR, "DFS failed to calculate CSA freq params");
+ hostapd_disable_iface(iface);
+ return err;
+ }
+
+ for (i = 0; i < iface->num_bss; i++) {
+ err = hostapd_switch_channel(iface->bss[i], &csa_settings);
+ if (err)
+ break;
+ }
+
+ if (err) {
+ wpa_printf(MSG_WARNING, "DFS failed to schedule CSA (%d) - trying fallback",
+ err);
+ iface->freq = channel->freq;
+ iface->conf->channel = channel->chan;
+ iface->conf->secondary_channel = secondary_channel;
+ iface->conf->vht_oper_centr_freq_seg0_idx =
+ vht_oper_centr_freq_seg0_idx;
+ iface->conf->vht_oper_centr_freq_seg1_idx =
+ vht_oper_centr_freq_seg1_idx;
+
+ hostapd_disable_iface(iface);
+ hostapd_enable_iface(iface);
+ return 0;
+ }
+
+ /* Channel configuration will be updated once CSA completes and
+ * ch_switch_notify event is received */
+
+ wpa_printf(MSG_DEBUG, "DFS waiting channel switch event");
+ return 0;
+}
+
+
+int hostapd_dfs_radar_detected(struct hostapd_iface *iface, int freq,
+ int ht_enabled, int chan_offset, int chan_width,
+ int cf1, int cf2)
+{
+ int res;
+
+ wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_RADAR_DETECTED
+ "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d",
+ freq, ht_enabled, chan_offset, chan_width, cf1, cf2);
+
+ /* Proceed only if DFS is not offloaded to the driver */
+ if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
+ return 0;
+
+ if (!iface->conf->ieee80211h)
+ return 0;
+
+ /* mark radar frequency as invalid */
+ set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width,
+ cf1, cf2, HOSTAPD_CHAN_DFS_UNAVAILABLE);
+
+ /* Skip if reported radar event not overlapped our channels */
+ res = dfs_are_channels_overlapped(iface, freq, chan_width, cf1, cf2);
+ if (!res)
+ return 0;
+
+ /* radar detected while operating, switch the channel. */
+ res = hostapd_dfs_start_channel_switch(iface);
+
+ return res;
+}
+
+
+int hostapd_dfs_nop_finished(struct hostapd_iface *iface, int freq,
+ int ht_enabled, int chan_offset, int chan_width,
+ int cf1, int cf2)
+{
+ wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NOP_FINISHED
+ "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d",
+ freq, ht_enabled, chan_offset, chan_width, cf1, cf2);
+
+ /* Proceed only if DFS is not offloaded to the driver */
+ if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
+ return 0;
+
+ /* TODO add correct implementation here */
+ set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width,
+ cf1, cf2, HOSTAPD_CHAN_DFS_USABLE);
+
+ /* Handle cases where all channels were initially unavailable */
+ if (iface->state == HAPD_IFACE_DFS && !iface->cac_started)
+ hostapd_handle_dfs(iface);
+
+ return 0;
+}
+
+
+int hostapd_is_dfs_required(struct hostapd_iface *iface)
+{
+ int n_chans, n_chans1, start_chan_idx, start_chan_idx1, res;
+
+ if (!iface->conf->ieee80211h || !iface->current_mode ||
+ iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
+ return 0;
+
+ /* Get start (first) channel for current configuration */
+ start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1);
+ if (start_chan_idx == -1)
+ return -1;
+
+ /* Get number of used channels, depend on width */
+ n_chans = dfs_get_used_n_chans(iface, &n_chans1);
+
+ /* Check if any of configured channels require DFS */
+ res = dfs_check_chans_radar(iface, start_chan_idx, n_chans);
+ if (res)
+ return res;
+ if (start_chan_idx1 >= 0 && n_chans1 > 0)
+ res = dfs_check_chans_radar(iface, start_chan_idx1, n_chans1);
+ return res;
+}
+
+
+int hostapd_dfs_start_cac(struct hostapd_iface *iface, int freq,
+ int ht_enabled, int chan_offset, int chan_width,
+ int cf1, int cf2)
+{
+ wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START
+ "freq=%d chan=%d chan_offset=%d width=%d seg0=%d "
+ "seg1=%d cac_time=%ds",
+ freq, (freq - 5000) / 5, chan_offset, chan_width, cf1, cf2, 60);
+ iface->cac_started = 1;
+ return 0;
+}
+
+
+/*
+ * Main DFS handler for offloaded case.
+ * 2 - continue channel/AP setup for non-DFS channel
+ * 1 - continue channel/AP setup for DFS channel
+ * 0 - channel/AP setup will be continued after CAC
+ * -1 - hit critical error
+ */
+int hostapd_handle_dfs_offload(struct hostapd_iface *iface)
+{
+ wpa_printf(MSG_DEBUG, "%s: iface->cac_started: %d",
+ __func__, iface->cac_started);
+
+ /*
+ * If DFS has already been started, then we are being called from a
+ * callback to continue AP/channel setup. Reset the CAC start flag and
+ * return.
+ */
+ if (iface->cac_started) {
+ wpa_printf(MSG_DEBUG, "%s: iface->cac_started: %d",
+ __func__, iface->cac_started);
+ iface->cac_started = 0;
+ return 1;
+ }
+
+ if (ieee80211_is_dfs(iface->freq)) {
+ wpa_printf(MSG_DEBUG, "%s: freq %d MHz requires DFS",
+ __func__, iface->freq);
+ return 0;
+ }
+
+ wpa_printf(MSG_DEBUG,
+ "%s: freq %d MHz does not require DFS. Continue channel/AP setup",
+ __func__, iface->freq);
+ return 2;
+}
projects / mech_eap.git / blobdiff