[][MAC80211][hostapd][zero wait dfs]
[Description]
Add zero wait DFS for hostapd
The following patches are for openwrt 2102:
404-2102-hostapd-sync-include-uapi-linux-nl80211.patch
405-2102-hostapd-zero-wait-dfs.patch
The following patches are for openwrt master:
406-master-hostapd-sync-include-uapi-linux-nl80211.patch
407-master-hostapd-zero-wait-dfs.patch
[Release-log]
Change-Id: I6df36dc7178c236e0e79f6b934e9600fad3c5bcd
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5342191
diff --git a/openwrt_patches-21.02/407-master-hostapd-zero-wait-dfs.patch b/openwrt_patches-21.02/407-master-hostapd-zero-wait-dfs.patch
new file mode 100644
index 0000000..005022a
--- /dev/null
+++ b/openwrt_patches-21.02/407-master-hostapd-zero-wait-dfs.patch
@@ -0,0 +1,857 @@
+diff --git a/package/network/services/hostapd/patches/904-master-zero-wait_dfs.patch b/package/network/services/hostapd/patches/904-master-zero-wait_dfs.patch
+new file mode 100644
+index 0000000..cb11aee
+--- /dev/null
++++ b/package/network/services/hostapd/patches/904-master-zero-wait_dfs.patch
+@@ -0,0 +1,851 @@
++diff --git a/hostapd/config_file.c b/hostapd/config_file.c
++index 1e1b685..8f6281a 100644
++--- a/hostapd/config_file.c
+++++ b/hostapd/config_file.c
++@@ -2476,6 +2476,8 @@ static int hostapd_config_fill(struct hostapd_config *conf,
++ conf->ieee80211d = atoi(pos);
++ } else if (os_strcmp(buf, "ieee80211h") == 0) {
++ conf->ieee80211h = atoi(pos);
+++ } else if (os_strcmp(buf, "radar_offchan") == 0) {
+++ conf->radar_offchan = atoi(pos);
++ } else if (os_strcmp(buf, "ieee8021x") == 0) {
++ bss->ieee802_1x = atoi(pos);
++ } else if (os_strcmp(buf, "eapol_version") == 0) {
++diff --git a/hostapd/hostapd.conf b/hostapd/hostapd.conf
++index a89ce9b..0c951a9 100644
++--- a/hostapd/hostapd.conf
+++++ b/hostapd/hostapd.conf
++@@ -143,6 +143,13 @@ ssid=test
++ # ieee80211d=1 and local_pwr_constraint configured.
++ #spectrum_mgmt_required=1
++
+++# Enable radar/CAC detection through a dedicated offchannel chain available on
+++# some hw. The chain can't be used to transmits or receives frames.
+++# This feature allows to avoid CAC downtime switching on a different channel
+++# during CAC detection on the selected radar channel.
+++# (default: 0 = disabled, 1 = enabled)
+++#radar_offchan=0
+++
++ # Operation mode (a = IEEE 802.11a (5 GHz), b = IEEE 802.11b (2.4 GHz),
++ # g = IEEE 802.11g (2.4 GHz), ad = IEEE 802.11ad (60 GHz); a/g options are used
++ # with IEEE 802.11n (HT), too, to specify band). For IEEE 802.11ac (VHT), this
++diff --git a/src/ap/ap_config.h b/src/ap/ap_config.h
++index 28b7efe..ffc3c2c 100644
++--- a/src/ap/ap_config.h
+++++ b/src/ap/ap_config.h
++@@ -993,6 +993,7 @@ struct hostapd_config {
++ int ieee80211d;
++
++ int ieee80211h; /* DFS */
+++ int radar_offchan;
++
++ /*
++ * Local power constraint is an octet encoded as an unsigned integer in
++diff --git a/src/ap/ap_drv_ops.c b/src/ap/ap_drv_ops.c
++index bc49079..c97ee39 100644
++--- a/src/ap/ap_drv_ops.c
+++++ b/src/ap/ap_drv_ops.c
++@@ -810,7 +810,8 @@ int hostapd_start_dfs_cac(struct hostapd_iface *iface,
++ int channel, int ht_enabled, int vht_enabled,
++ int he_enabled,
++ int sec_channel_offset, int oper_chwidth,
++- int center_segment0, int center_segment1)
+++ int center_segment0, int center_segment1,
+++ int radar_offchan)
++ {
++ struct hostapd_data *hapd = iface->bss[0];
++ struct hostapd_freq_params data;
++@@ -836,10 +837,14 @@ int hostapd_start_dfs_cac(struct hostapd_iface *iface,
++ wpa_printf(MSG_ERROR, "Can't set freq params");
++ return -1;
++ }
+++ data.radar_offchan = radar_offchan;
++
++ res = hapd->driver->start_dfs_cac(hapd->drv_priv, &data);
++ if (!res) {
++- iface->cac_started = 1;
+++ if (radar_offchan)
+++ iface->radar_offchan.cac_started = 1;
+++ else
+++ iface->cac_started = 1;
++ os_get_reltime(&iface->dfs_cac_start);
++ }
++
++diff --git a/src/ap/ap_drv_ops.h b/src/ap/ap_drv_ops.h
++index 61c8f64..92842a1 100644
++--- a/src/ap/ap_drv_ops.h
+++++ b/src/ap/ap_drv_ops.h
++@@ -130,7 +130,8 @@ int hostapd_start_dfs_cac(struct hostapd_iface *iface,
++ int channel, int ht_enabled, int vht_enabled,
++ int he_enabled,
++ int sec_channel_offset, int oper_chwidth,
++- int center_segment0, int center_segment1);
+++ int center_segment0, int center_segment1,
+++ int radar_offchan);
++ int hostapd_drv_do_acs(struct hostapd_data *hapd);
++ int hostapd_drv_update_dh_ie(struct hostapd_data *hapd, const u8 *peer,
++ u16 reason_code, const u8 *ie, size_t ielen);
++diff --git a/src/ap/dfs.c b/src/ap/dfs.c
++index eccda1a..3b1276f 100644
++--- a/src/ap/dfs.c
+++++ b/src/ap/dfs.c
++@@ -51,16 +51,31 @@ static int dfs_get_used_n_chans(struct hostapd_iface *iface, int *seg1)
++ return n_chans;
++ }
++
++-
+++/*
+++ * flags:
+++ * - 0: any channel
+++ * - 1: non-radar channel or radar available one
+++ * - 2: radar-only channel not yet available
+++ */
++ static int dfs_channel_available(struct hostapd_channel_data *chan,
++- int skip_radar)
+++ int flags)
++ {
+++ if (flags == 2) {
+++ /* Select only radar channel where CAC has not been
+++ * performed yet
+++ */
+++ if ((chan->flag & HOSTAPD_CHAN_RADAR) &&
+++ (chan->flag & HOSTAPD_CHAN_DFS_MASK) ==
+++ HOSTAPD_CHAN_DFS_USABLE)
+++ return 1;
+++ return 0;
+++ }
++ /*
++ * 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) &&
+++ if (flags && (chan->flag & HOSTAPD_CHAN_RADAR) &&
++ ((chan->flag & HOSTAPD_CHAN_DFS_MASK) !=
++ HOSTAPD_CHAN_DFS_AVAILABLE))
++ return 0;
++@@ -136,10 +151,15 @@ dfs_get_chan_data(struct hostapd_hw_modes *mode, int freq, int first_chan_idx)
++ return NULL;
++ }
++
++-
+++/*
+++ * flags:
+++ * - 0: any channel
+++ * - 1: non-radar channel or radar available one
+++ * - 2: radar-only channel not yet available
+++ */
++ static int dfs_chan_range_available(struct hostapd_hw_modes *mode,
++ int first_chan_idx, int num_chans,
++- int skip_radar)
+++ int flags)
++ {
++ struct hostapd_channel_data *first_chan, *chan;
++ int i;
++@@ -178,7 +198,7 @@ static int dfs_chan_range_available(struct hostapd_hw_modes *mode,
++ return 0;
++ }
++
++- if (!dfs_channel_available(chan, skip_radar)) {
+++ if (!dfs_channel_available(chan, flags)) {
++ wpa_printf(MSG_DEBUG, "DFS: channel not available %d",
++ first_chan->freq + i * 20);
++ return 0;
++@@ -205,10 +225,15 @@ static int is_in_chanlist(struct hostapd_iface *iface,
++ * - hapd->secondary_channel
++ * - hapd->vht/he_oper_centr_freq_seg0_idx
++ * - hapd->vht/he_oper_centr_freq_seg1_idx
+++ *
+++ * flags:
+++ * - 0: any channel
+++ * - 1: non-radar channel or radar available one
+++ * - 2: radar-only channel not yet available
++ */
++ static int dfs_find_channel(struct hostapd_iface *iface,
++ struct hostapd_channel_data **ret_chan,
++- int idx, int skip_radar)
+++ int idx, int flags)
++ {
++ struct hostapd_hw_modes *mode;
++ struct hostapd_channel_data *chan;
++@@ -233,7 +258,7 @@ static int dfs_find_channel(struct hostapd_iface *iface,
++ }
++
++ /* Skip incompatible chandefs */
++- if (!dfs_chan_range_available(mode, i, n_chans, skip_radar)) {
+++ if (!dfs_chan_range_available(mode, i, n_chans, flags)) {
++ wpa_printf(MSG_DEBUG,
++ "DFS: range not available for %d (%d)",
++ chan->freq, chan->chan);
++@@ -467,13 +492,18 @@ static int dfs_check_chans_unavailable(struct hostapd_iface *iface,
++ return res;
++ }
++
++-
+++/*
+++ * flags:
+++ * - 0: any channel
+++ * - 1: non-radar channel or radar available one
+++ * - 2: radar-only channel not yet available
+++ */
++ static struct hostapd_channel_data *
++ dfs_get_valid_channel(struct hostapd_iface *iface,
++ int *secondary_channel,
++ u8 *oper_centr_freq_seg0_idx,
++ u8 *oper_centr_freq_seg1_idx,
++- int skip_radar)
+++ int flags)
++ {
++ struct hostapd_hw_modes *mode;
++ struct hostapd_channel_data *chan = NULL;
++@@ -502,7 +532,7 @@ dfs_get_valid_channel(struct hostapd_iface *iface,
++ return NULL;
++
++ /* Get the count first */
++- num_available_chandefs = dfs_find_channel(iface, NULL, 0, skip_radar);
+++ num_available_chandefs = dfs_find_channel(iface, NULL, 0, flags);
++ wpa_printf(MSG_DEBUG, "DFS: num_available_chandefs=%d",
++ num_available_chandefs);
++ if (num_available_chandefs == 0)
++@@ -523,7 +553,7 @@ dfs_get_valid_channel(struct hostapd_iface *iface,
++ return NULL;
++
++ chan_idx = _rand % num_available_chandefs;
++- dfs_find_channel(iface, &chan, chan_idx, skip_radar);
+++ dfs_find_channel(iface, &chan, chan_idx, flags);
++ if (!chan) {
++ wpa_printf(MSG_DEBUG, "DFS: no random channel found");
++ return NULL;
++@@ -552,7 +582,7 @@ dfs_get_valid_channel(struct hostapd_iface *iface,
++ for (i = 0; i < num_available_chandefs - 1; i++) {
++ /* start from chan_idx + 1, end when chan_idx - 1 */
++ chan_idx2 = (chan_idx + 1 + i) % num_available_chandefs;
++- dfs_find_channel(iface, &chan2, chan_idx2, skip_radar);
+++ dfs_find_channel(iface, &chan2, chan_idx2, flags);
++ if (chan2 && abs(chan2->chan - chan->chan) > 12) {
++ /* two channels are not adjacent */
++ sec_chan_idx_80p80 = chan2->chan;
++@@ -582,6 +612,27 @@ dfs_get_valid_channel(struct hostapd_iface *iface,
++ return chan;
++ }
++
+++static int dfs_set_valid_channel(struct hostapd_iface *iface, int skip_radar)
+++{
+++ struct hostapd_channel_data *channel;
+++ u8 cf1 = 0, cf2 = 0;
+++ int sec = 0;
+++
+++ channel = dfs_get_valid_channel(iface, &sec, &cf1, &cf2,
+++ skip_radar);
+++ if (!channel) {
+++ wpa_printf(MSG_ERROR, "could not get valid channel");
+++ return -1;
+++ }
+++
+++ iface->freq = channel->freq;
+++ iface->conf->channel = channel->chan;
+++ iface->conf->secondary_channel = sec;
+++ hostapd_set_oper_centr_freq_seg0_idx(iface->conf, cf1);
+++ hostapd_set_oper_centr_freq_seg1_idx(iface->conf, cf2);
+++
+++ return 0;
+++}
++
++ static int set_dfs_state_freq(struct hostapd_iface *iface, int freq, u32 state)
++ {
++@@ -761,6 +812,11 @@ static unsigned int dfs_get_cac_time(struct hostapd_iface *iface,
++ return cac_time_ms;
++ }
++
+++static int hostapd_is_radar_offchan_enabled(struct hostapd_iface *iface)
+++{
+++ return (iface->drv_flags2 & WPA_DRIVER_RADAR_OFFCHAN) &&
+++ iface->conf->radar_offchan;
+++}
++
++ /*
++ * Main DFS handler
++@@ -770,9 +826,8 @@ static unsigned int dfs_get_cac_time(struct hostapd_iface *iface,
++ */
++ 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;
+++ int skip_radar = 0, radar_offchan;
++
++ if (is_6ghz_freq(iface->freq))
++ return 1;
++@@ -825,28 +880,18 @@ int hostapd_handle_dfs(struct hostapd_iface *iface)
++ 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");
+++ if (dfs_set_valid_channel(iface, skip_radar) < 0) {
++ hostapd_set_state(iface, HAPD_IFACE_DFS);
++ return 0;
++ }
++-
++- iface->freq = channel->freq;
++- iface->conf->channel = channel->chan;
++- iface->conf->secondary_channel = sec;
++- hostapd_set_oper_centr_freq_seg0_idx(iface->conf, cf1);
++- hostapd_set_oper_centr_freq_seg1_idx(iface->conf, 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);
+++ radar_offchan = hostapd_is_radar_offchan_enabled(iface);
+++ wpa_printf(MSG_DEBUG, "DFS start CAC on %d MHz offchan %d",
+++ iface->freq, radar_offchan);
++ 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,
++@@ -863,13 +908,37 @@ int hostapd_handle_dfs(struct hostapd_iface *iface)
++ iface->conf->secondary_channel,
++ hostapd_get_oper_chwidth(iface->conf),
++ hostapd_get_oper_centr_freq_seg0_idx(iface->conf),
++- hostapd_get_oper_centr_freq_seg1_idx(iface->conf));
+++ hostapd_get_oper_centr_freq_seg1_idx(iface->conf),
+++ radar_offchan);
++
++ if (res) {
++ wpa_printf(MSG_ERROR, "DFS start_dfs_cac() failed, %d", res);
++ return -1;
++ }
++
+++ if (radar_offchan) {
+++ /* Cache offchannel radar parameters */
+++ iface->radar_offchan.channel = iface->conf->channel;
+++ iface->radar_offchan.secondary_channel =
+++ iface->conf->secondary_channel;
+++ iface->radar_offchan.freq = iface->freq;
+++ iface->radar_offchan.centr_freq_seg0_idx =
+++ hostapd_get_oper_centr_freq_seg0_idx(iface->conf);
+++ iface->radar_offchan.centr_freq_seg1_idx =
+++ hostapd_get_oper_centr_freq_seg1_idx(iface->conf);
+++
+++ /*
+++ * Let's select a random channel for the moment
+++ * and perform CAC on dedicated radar chain
+++ */
+++ res = dfs_set_valid_channel(iface, 1);
+++ if (res < 0)
+++ return res;
+++
+++ iface->radar_offchan.temp_ch = 1;
+++ return 1;
+++ }
+++
++ return 0;
++ }
++
++@@ -890,6 +959,157 @@ int hostapd_is_dfs_chan_available(struct hostapd_iface *iface)
++ return dfs_check_chans_available(iface, start_chan_idx, n_chans);
++ }
++
+++static int hostapd_dfs_request_channel_switch(struct hostapd_iface *iface,
+++ int channel, int freq,
+++ int secondary_channel,
+++ u8 oper_centr_freq_seg0_idx,
+++ u8 oper_centr_freq_seg1_idx)
+++{
+++ struct hostapd_hw_modes *cmode = iface->current_mode;
+++ int ieee80211_mode = IEEE80211_MODE_AP, err, i;
+++ struct csa_settings csa_settings;
+++ u8 new_vht_oper_chwidth;
+++
+++ wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d", channel);
+++ wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL
+++ "freq=%d chan=%d sec_chan=%d", freq, channel,
+++ secondary_channel);
+++
+++ new_vht_oper_chwidth = hostapd_get_oper_chwidth(iface->conf);
+++ hostapd_set_oper_chwidth(iface->conf,
+++ hostapd_get_oper_chwidth(iface->conf));
+++
+++ /* Setup CSA request */
+++ os_memset(&csa_settings, 0, sizeof(csa_settings));
+++ csa_settings.cs_count = 5;
+++ csa_settings.block_tx = 1;
+++#ifdef CONFIG_MESH
+++ if (iface->mconf)
+++ ieee80211_mode = IEEE80211_MODE_MESH;
+++#endif /* CONFIG_MESH */
+++ err = hostapd_set_freq_params(&csa_settings.freq_params,
+++ iface->conf->hw_mode,
+++ freq, channel,
+++ iface->conf->enable_edmg,
+++ iface->conf->edmg_channel,
+++ iface->conf->ieee80211n,
+++ iface->conf->ieee80211ac,
+++ iface->conf->ieee80211ax,
+++ secondary_channel,
+++ new_vht_oper_chwidth,
+++ oper_centr_freq_seg0_idx,
+++ oper_centr_freq_seg1_idx,
+++ cmode->vht_capab,
+++ &cmode->he_capab[ieee80211_mode]);
+++
+++ 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 = freq;
+++ iface->conf->channel = channel;
+++ iface->conf->secondary_channel = secondary_channel;
+++ hostapd_set_oper_chwidth(iface->conf, new_vht_oper_chwidth);
+++ hostapd_set_oper_centr_freq_seg0_idx(iface->conf,
+++ oper_centr_freq_seg0_idx);
+++ hostapd_set_oper_centr_freq_seg1_idx(iface->conf,
+++ 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;
+++}
+++
+++static struct hostapd_channel_data *
+++dfs_downgrade_bandwidth(struct hostapd_iface *iface, int *secondary_channel,
+++ u8 *oper_centr_freq_seg0_idx,
+++ u8 *oper_centr_freq_seg1_idx, int *skip_radar);
+++
+++static void
+++hostpad_dfs_update_offchannel_chain(struct hostapd_iface *iface)
+++{
+++ struct hostapd_channel_data *channel;
+++ int sec = 0, flags = 2;
+++ u8 cf1 = 0, cf2 = 0;
+++
+++ channel = dfs_get_valid_channel(iface, &sec, &cf1, &cf2, 2);
+++ if (!channel || channel->chan == iface->conf->channel)
+++ channel = dfs_downgrade_bandwidth(iface, &sec, &cf1, &cf2,
+++ &flags);
+++ if (!channel ||
+++ hostapd_start_dfs_cac(iface, iface->conf->hw_mode,
+++ channel->freq, channel->chan,
+++ iface->conf->ieee80211n,
+++ iface->conf->ieee80211ac,
+++ iface->conf->ieee80211ax,
+++ sec, hostapd_get_oper_chwidth(iface->conf),
+++ cf1, cf2, 1)) {
+++ /*
+++ * Toggle interface state to enter DFS state
+++ * until NOP is finished.
+++ */
+++ wpa_printf(MSG_ERROR, "DFS failed start CAC offchannel");
+++ return;
+++ }
+++
+++ wpa_printf(MSG_DEBUG, "%s: setting offchannel chain to chan %d (%d MHz)",
+++ __func__, channel->chan, channel->freq);
+++
+++ iface->radar_offchan.channel = channel->chan;
+++ iface->radar_offchan.freq = channel->freq;
+++ iface->radar_offchan.secondary_channel = sec;
+++ iface->radar_offchan.centr_freq_seg0_idx = cf1;
+++ iface->radar_offchan.centr_freq_seg1_idx = cf2;
+++}
+++
+++/* FIXME: check if all channel bandwith */
+++static int
+++hostapd_dfs_is_offchan_event(struct hostapd_iface *iface, int freq)
+++{
+++ if (iface->radar_offchan.freq != freq)
+++ return 0;
+++
+++ return 1;
+++}
+++
+++static int
+++hostapd_dfs_start_channel_switch_offchan(struct hostapd_iface *iface)
+++{
+++ iface->conf->channel = iface->radar_offchan.channel;
+++ iface->freq = iface->radar_offchan.freq;
+++ iface->conf->secondary_channel =
+++ iface->radar_offchan.secondary_channel;
+++ hostapd_set_oper_centr_freq_seg0_idx(iface->conf,
+++ iface->radar_offchan.centr_freq_seg0_idx);
+++ hostapd_set_oper_centr_freq_seg1_idx(iface->conf,
+++ iface->radar_offchan.centr_freq_seg1_idx);
+++
+++ hostpad_dfs_update_offchannel_chain(iface);
+++
+++ return hostapd_dfs_request_channel_switch(iface, iface->conf->channel,
+++ iface->freq, iface->conf->secondary_channel,
+++ hostapd_get_oper_centr_freq_seg0_idx(iface->conf),
+++ hostapd_get_oper_centr_freq_seg1_idx(iface->conf));
+++}
++
++ int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq,
++ int ht_enabled, int chan_offset, int chan_width,
++@@ -911,6 +1131,23 @@ int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq,
++ set_dfs_state(iface, freq, ht_enabled, chan_offset,
++ chan_width, cf1, cf2,
++ HOSTAPD_CHAN_DFS_AVAILABLE);
+++
+++ /*
+++ * radar event from offchannel chain for selected
+++ * channel. Perfrom CSA, move main chain to selected
+++ * channel and configure offchannel chain to a new DFS
+++ * channel
+++ */
+++ if (hostapd_is_radar_offchan_enabled(iface) &&
+++ hostapd_dfs_is_offchan_event(iface, freq)) {
+++ iface->radar_offchan.cac_started = 0;
+++ if (iface->radar_offchan.temp_ch) {
+++ iface->radar_offchan.temp_ch = 0;
+++ return hostapd_dfs_start_channel_switch_offchan(iface);
+++ }
+++ return 0;
+++ }
+++
++ /*
++ * Just mark the channel available when CAC completion
++ * event is received in enabled state. CAC result could
++@@ -927,6 +1164,10 @@ int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq,
++ iface->cac_started = 0;
++ }
++ }
+++ } else if (hostapd_is_radar_offchan_enabled(iface) &&
+++ hostapd_dfs_is_offchan_event(iface, freq)) {
+++ iface->radar_offchan.cac_started = 0;
+++ hostpad_dfs_update_offchannel_chain(iface);
++ }
++
++ return 0;
++@@ -1036,6 +1277,44 @@ static int hostapd_dfs_start_channel_switch_cac(struct hostapd_iface *iface)
++ return err;
++ }
++
+++static int
+++hostapd_dfs_offchan_start_channel_switch(struct hostapd_iface *iface, int freq)
+++{
+++ if (!hostapd_is_radar_offchan_enabled(iface))
+++ return -1; /* Offchannel chain not supported */
+++
+++ wpa_printf(MSG_DEBUG,
+++ "%s called (offchannel CAC active: %s, CSA active: %s)",
+++ __func__, iface->radar_offchan.cac_started ? "yes" : "no",
+++ hostapd_csa_in_progress(iface) ? "yes" : "no");
+++
+++ /* Check if CSA in progress */
+++ if (hostapd_csa_in_progress(iface))
+++ return 0;
+++
+++ /*
+++ * If offchannel radar detation is supported and radar channel
+++ * monitored by offchain is available switch to it without waiting
+++ * for the CAC otherwise let's keep a random channel.
+++ * If radar pattern is reported on offchannel chain, just switch to
+++ * monitor another radar channel.
+++ */
+++ if (hostapd_dfs_is_offchan_event(iface, freq)) {
+++ hostpad_dfs_update_offchannel_chain(iface);
+++ return 0;
+++ }
+++
+++ /* Offchannel not availanle yet. Perform CAC on main chain */
+++ if (iface->radar_offchan.cac_started) {
+++ /* We want to switch to monitored channel as soon as
+++ * CAC is completed.
+++ */
+++ iface->radar_offchan.temp_ch = 1;
+++ return -1;
+++ }
+++
+++ return hostapd_dfs_start_channel_switch_offchan(iface);
+++}
++
++ static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface)
++ {
++@@ -1043,13 +1322,7 @@ static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface)
++ int secondary_channel;
++ u8 oper_centr_freq_seg0_idx;
++ u8 oper_centr_freq_seg1_idx;
++- u8 new_vht_oper_chwidth;
++ int skip_radar = 1;
++- struct csa_settings csa_settings;
++- unsigned int i;
++- int err = 1;
++- struct hostapd_hw_modes *cmode = iface->current_mode;
++- u8 current_vht_oper_chwidth = hostapd_get_oper_chwidth(iface->conf);
++ int ieee80211_mode = IEEE80211_MODE_AP;
++
++ wpa_printf(MSG_DEBUG, "%s called (CAC active: %s, CSA active: %s)",
++@@ -1113,73 +1386,16 @@ static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface)
++ }
++ }
++
++- 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);
++-
++- new_vht_oper_chwidth = hostapd_get_oper_chwidth(iface->conf);
++- hostapd_set_oper_chwidth(iface->conf, current_vht_oper_chwidth);
++-
++- /* Setup CSA request */
++- os_memset(&csa_settings, 0, sizeof(csa_settings));
++- csa_settings.cs_count = 5;
++- csa_settings.block_tx = 1;
++ #ifdef CONFIG_MESH
++ if (iface->mconf)
++ ieee80211_mode = IEEE80211_MODE_MESH;
++ #endif /* CONFIG_MESH */
++- err = hostapd_set_freq_params(&csa_settings.freq_params,
++- iface->conf->hw_mode,
++- channel->freq,
++- channel->chan,
++- iface->conf->enable_edmg,
++- iface->conf->edmg_channel,
++- iface->conf->ieee80211n,
++- iface->conf->ieee80211ac,
++- iface->conf->ieee80211ax,
++- secondary_channel,
++- new_vht_oper_chwidth,
++- oper_centr_freq_seg0_idx,
++- oper_centr_freq_seg1_idx,
++- cmode->vht_capab,
++- &cmode->he_capab[ieee80211_mode]);
++-
++- 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;
++- hostapd_set_oper_chwidth(iface->conf, new_vht_oper_chwidth);
++- hostapd_set_oper_centr_freq_seg0_idx(iface->conf,
++- oper_centr_freq_seg0_idx);
++- hostapd_set_oper_centr_freq_seg1_idx(iface->conf,
++- 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;
+++ return hostapd_dfs_request_channel_switch(iface, channel->chan,
+++ channel->freq,
+++ secondary_channel,
+++ oper_centr_freq_seg0_idx,
+++ oper_centr_freq_seg1_idx);
++ }
++
++
++@@ -1208,15 +1424,19 @@ int hostapd_dfs_radar_detected(struct hostapd_iface *iface, int freq,
++ if (!res)
++ return 0;
++
++- /* Skip if reported radar event not overlapped our channels */
++- res = dfs_are_channels_overlapped(iface, freq, chan_width, cf1, cf2);
++- if (!res)
++- return 0;
+++ if (!hostapd_dfs_is_offchan_event(iface, freq)) {
+++ /* 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);
+++ if (hostapd_dfs_offchan_start_channel_switch(iface, freq))
+++ /* radar detected while operating, switch the channel. */
+++ return hostapd_dfs_start_channel_switch(iface);
++
++- return res;
+++ return 0;
++ }
++
++
++@@ -1284,7 +1504,11 @@ int hostapd_dfs_start_cac(struct hostapd_iface *iface, int freq,
++ "seg1=%d cac_time=%ds",
++ freq, (freq - 5000) / 5, chan_offset, chan_width, cf1, cf2,
++ iface->dfs_cac_ms / 1000);
++- iface->cac_started = 1;
+++
+++ if (hostapd_dfs_is_offchan_event(iface, freq))
+++ iface->radar_offchan.cac_started = 1;
+++ else
+++ iface->cac_started = 1;
++ os_get_reltime(&iface->dfs_cac_start);
++ return 0;
++ }
++diff --git a/src/ap/hostapd.h b/src/ap/hostapd.h
++index 27b985d..1c6c94e 100644
++--- a/src/ap/hostapd.h
+++++ b/src/ap/hostapd.h
++@@ -521,6 +521,21 @@ struct hostapd_iface {
++ int *basic_rates;
++ int freq;
++
+++ /* Offchanel chain configuration */
+++ struct {
+++ int channel;
+++ int secondary_channel;
+++ int freq;
+++ int centr_freq_seg0_idx;
+++ int centr_freq_seg1_idx;
+++ /* Main chain is on temporary channel during
+++ * CAC detection on radar offchain
+++ */
+++ unsigned int temp_ch:1;
+++ /* CAC started on radar offchain */
+++ unsigned int cac_started:1;
+++ } radar_offchan;
+++
++ u16 hw_flags;
++
++ /* Number of associated Non-ERP stations (i.e., stations using 802.11b
++diff --git a/src/drivers/driver.h b/src/drivers/driver.h
++index 6d9194f..7ed47c0 100644
++--- a/src/drivers/driver.h
+++++ b/src/drivers/driver.h
++@@ -777,6 +777,11 @@ struct hostapd_freq_params {
++ * for IEEE 802.11ay EDMG configuration.
++ */
++ struct ieee80211_edmg_config edmg;
+++
+++ /**
+++ * radar_offchan - Whether radar/CAC offchannel is requested
+++ */
+++ int radar_offchan;
++ };
++
++ /**
++@@ -2026,6 +2031,8 @@ struct wpa_driver_capa {
++ #define WPA_DRIVER_FLAGS2_OCV 0x0000000000000080ULL
++ /** Driver expects user space implementation of SME in AP mode */
++ #define WPA_DRIVER_FLAGS2_AP_SME 0x0000000000000100ULL
+++/** Driver supports offchannel radar/CAC detection */
+++#define WPA_DRIVER_RADAR_OFFCHAN 0x0000000000000200ULL
++ u64 flags2;
++
++ #define FULL_AP_CLIENT_STATE_SUPP(drv_flags) \
++diff --git a/src/drivers/driver_nl80211.c b/src/drivers/driver_nl80211.c
++index 4db8cce..62c3cd8 100644
++--- a/src/drivers/driver_nl80211.c
+++++ b/src/drivers/driver_nl80211.c
++@@ -4885,6 +4885,7 @@ static int nl80211_put_freq_params(struct nl_msg *msg,
++ wpa_printf(MSG_DEBUG, " * he_enabled=%d", freq->he_enabled);
++ wpa_printf(MSG_DEBUG, " * vht_enabled=%d", freq->vht_enabled);
++ wpa_printf(MSG_DEBUG, " * ht_enabled=%d", freq->ht_enabled);
+++ wpa_printf(MSG_DEBUG, " * radar_offchan=%d", freq->radar_offchan);
++
++ hw_mode = ieee80211_freq_to_chan(freq->freq, &channel);
++ is_24ghz = hw_mode == HOSTAPD_MODE_IEEE80211G ||
++@@ -4962,6 +4963,9 @@ static int nl80211_put_freq_params(struct nl_msg *msg,
++ NL80211_CHAN_NO_HT))
++ return -ENOBUFS;
++ }
+++ if (freq->radar_offchan)
+++ nla_put_flag(msg, NL80211_ATTR_RADAR_OFFCHAN);
+++
++ return 0;
++ }
++
++diff --git a/src/drivers/driver_nl80211_capa.c b/src/drivers/driver_nl80211_capa.c
++index cd596e3..e370ef3 100644
++--- a/src/drivers/driver_nl80211_capa.c
+++++ b/src/drivers/driver_nl80211_capa.c
++@@ -665,6 +665,10 @@ static void wiphy_info_ext_feature_flags(struct wiphy_info_data *info,
++ if (ext_feature_isset(ext_features, len,
++ NL80211_EXT_FEATURE_OPERATING_CHANNEL_VALIDATION))
++ capa->flags2 |= WPA_DRIVER_FLAGS2_OCV;
+++
+++ if (ext_feature_isset(ext_features, len,
+++ NL80211_EXT_FEATURE_RADAR_OFFCHAN))
+++ capa->flags2 |= WPA_DRIVER_RADAR_OFFCHAN;
++ }
++
++
++diff --git a/src/drivers/nl80211_copy.h b/src/drivers/nl80211_copy.h
++index f7be755..736b483 100644
++--- a/src/drivers/nl80211_copy.h
+++++ b/src/drivers/nl80211_copy.h
++@@ -2573,6 +2573,10 @@ enum nl80211_commands {
++ * @NL80211_ATTR_WIPHY_ANTENNA_GAIN: Configured antenna gain. Used to reduce
++ * transmit power to stay within regulatory limits. u32, dBi.
++ *
+++ * @NL80211_ATTR_RADAR_OFFCHAN: Configure dedicated chain available for radar
+++ * detection on some hw. The chain can't be used to transmits or receives
+++ * frames. The driver is supposed to implement CAC management in sw or fw.
+++ *
++ * @NUM_NL80211_ATTR: total number of nl80211_attrs available
++ * @NL80211_ATTR_MAX: highest attribute number currently defined
++ * @__NL80211_ATTR_AFTER_LAST: internal use
++@@ -3078,6 +3082,8 @@ enum nl80211_attrs {
++
++ NL80211_ATTR_WIPHY_ANTENNA_GAIN,
++
+++ NL80211_ATTR_RADAR_OFFCHAN,
+++
++ /* add attributes here, update the policy in nl80211.c */
++
++ __NL80211_ATTR_AFTER_LAST,
++@@ -5974,6 +5980,9 @@ enum nl80211_feature_flags {
++ * @NL80211_EXT_FEATURE_BSS_COLOR: The driver supports BSS color collision
++ * detection and change announcemnts.
++ *
+++ * @NL80211_EXT_FEATURE_RADAR_OFFCHAN: Device supports offchannel radar/CAC
+++ * detection.
+++ *
++ * @NUM_NL80211_EXT_FEATURES: number of extended features.
++ * @MAX_NL80211_EXT_FEATURES: highest extended feature index.
++ */
++@@ -6039,6 +6048,7 @@ enum nl80211_ext_feature_index {
++ NL80211_EXT_FEATURE_SECURE_RTT,
++ NL80211_EXT_FEATURE_PROT_RANGE_NEGO_AND_MEASURE,
++ NL80211_EXT_FEATURE_BSS_COLOR,
+++ NL80211_EXT_FEATURE_RADAR_OFFCHAN,
++
++ /* add new features before the definition below */
++ NUM_NL80211_EXT_FEATURES,