mac80211: support secondary channel offset in CSA

Add support for the secondary channel offset IE in channel
switch announcements. This is necessary for proper handling
of CSA on HT access points.

For this to work it is also necessary to convert everything
here to use chandef structs instead of just channels. The
driver updates aren't really correct though. In particular,
the TI wl18xx driver update can't possibly be right since
it just ignores the new channel width for lack of firmware
API.

Signed-off-by: Johannes Berg <[e-mail]>

drivers/net/wireless/iwlegacy/4965-mac.c

···
 	struct il_priv *il = hw->priv;
 	const struct il_channel_info *ch_info;
 	struct ieee80211_conf *conf = &hw->conf;
-	struct ieee80211_channel *channel = ch_switch->channel;
+	struct ieee80211_channel *channel = ch_switch->chandef.chan;
 	struct il_ht_config *ht_conf = &il->current_ht_config;
 	u16 ch;
 
···
 	il->current_ht_config.smps = conf->smps_mode;
 
 	/* Configure HT40 channels */
-	il->ht.enabled = conf_is_ht(conf);
-	if (il->ht.enabled) {
-		if (conf_is_ht40_minus(conf)) {
-			il->ht.extension_chan_offset =
-			    IEEE80211_HT_PARAM_CHA_SEC_BELOW;
-			il->ht.is_40mhz = true;
-		} else if (conf_is_ht40_plus(conf)) {
-			il->ht.extension_chan_offset =
-			    IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
-			il->ht.is_40mhz = true;
-		} else {
-			il->ht.extension_chan_offset =
-			    IEEE80211_HT_PARAM_CHA_SEC_NONE;
-			il->ht.is_40mhz = false;
-		}
-	} else
+	switch (cfg80211_get_chandef_type(&ch_switch->chandef)) {
+	case NL80211_CHAN_NO_HT:
+	case NL80211_CHAN_HT20:
 		il->ht.is_40mhz = false;
+		il->ht.extension_chan_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
+		break;
+	case NL80211_CHAN_HT40MINUS:
+		il->ht.extension_chan_offset = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
+		il->ht.is_40mhz = true;
+		break;
+	case NL80211_CHAN_HT40PLUS:
+		il->ht.extension_chan_offset = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
+		il->ht.is_40mhz = true;
+		break;
+	}
 
 	if ((le16_to_cpu(il->staging.channel) != ch))
 		il->staging.flags = 0;

drivers/net/wireless/iwlegacy/4965.c

···
 
 	cmd.band = band;
 	cmd.expect_beacon = 0;
-	ch = ch_switch->channel->hw_value;
+	ch = ch_switch->chandef.chan->hw_value;
 	cmd.channel = cpu_to_le16(ch);
 	cmd.rxon_flags = il->staging.flags;
 	cmd.rxon_filter_flags = il->staging.filter_flags;

drivers/net/wireless/iwlwifi/dvm/devices.c

···
 	};
 
 	cmd.band = priv->band == IEEE80211_BAND_2GHZ;
-	ch = ch_switch->channel->hw_value;
+	ch = ch_switch->chandef.chan->hw_value;
 	IWL_DEBUG_11H(priv, "channel switch from %d to %d\n",
 		      ctx->active.channel, ch);
 	cmd.channel = cpu_to_le16(ch);
···
 	}
 	IWL_DEBUG_11H(priv, "uCode time for the switch is 0x%x\n",
 		      cmd.switch_time);
-	cmd.expect_beacon = ch_switch->channel->flags & IEEE80211_CHAN_RADAR;
+	cmd.expect_beacon =
+		ch_switch->chandef.chan->flags & IEEE80211_CHAN_RADAR;
 
 	return iwl_dvm_send_cmd(priv, &hcmd);
 }
···
 	hcmd.data[0] = cmd;
 
 	cmd->band = priv->band == IEEE80211_BAND_2GHZ;
-	ch = ch_switch->channel->hw_value;
+	ch = ch_switch->chandef.chan->hw_value;
 	IWL_DEBUG_11H(priv, "channel switch from %u to %u\n",
 		      ctx->active.channel, ch);
 	cmd->channel = cpu_to_le16(ch);
···
 	}
 	IWL_DEBUG_11H(priv, "uCode time for the switch is 0x%x\n",
 		      cmd->switch_time);
-	cmd->expect_beacon = ch_switch->channel->flags & IEEE80211_CHAN_RADAR;
+	cmd->expect_beacon =
+		ch_switch->chandef.chan->flags & IEEE80211_CHAN_RADAR;
 
 	err = iwl_dvm_send_cmd(priv, &hcmd);
 	kfree(cmd);

drivers/net/wireless/iwlwifi/dvm/mac80211.c

···
 {
 	struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
 	struct ieee80211_conf *conf = &hw->conf;
-	struct ieee80211_channel *channel = ch_switch->channel;
+	struct ieee80211_channel *channel = ch_switch->chandef.chan;
 	struct iwl_ht_config *ht_conf = &priv->current_ht_config;
 	/*
 	 * MULTI-FIXME
···
 	priv->current_ht_config.smps = conf->smps_mode;
 
 	/* Configure HT40 channels */
-	ctx->ht.enabled = conf_is_ht(conf);
-	if (ctx->ht.enabled)
-		iwlagn_config_ht40(conf, ctx);
-	else
+	switch (cfg80211_get_chandef_type(&ch_switch->chandef)) {
+	case NL80211_CHAN_NO_HT:
+	case NL80211_CHAN_HT20:
 		ctx->ht.is_40mhz = false;
+		ctx->ht.extension_chan_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
+		break;
+	case NL80211_CHAN_HT40MINUS:
+		ctx->ht.extension_chan_offset = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
+		ctx->ht.is_40mhz = true;
+		break;
+	case NL80211_CHAN_HT40PLUS:
+		ctx->ht.extension_chan_offset = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
+		ctx->ht.is_40mhz = true;
+		break;
+	}
 
 	if ((le16_to_cpu(ctx->staging.channel) != ch))
 		ctx->staging.flags = 0;

drivers/net/wireless/iwlwifi/dvm/rxon.c

···
 }
 
 void iwlagn_config_ht40(struct ieee80211_conf *conf,
-	struct iwl_rxon_context *ctx)
+			struct iwl_rxon_context *ctx)
 {
 	if (conf_is_ht40_minus(conf)) {
 		ctx->ht.extension_chan_offset =

drivers/net/wireless/ti/wl12xx/cmd.c

···
 	}
 
 	cmd->role_id = wlvif->role_id;
-	cmd->channel = ch_switch->channel->hw_value;
+	cmd->channel = ch_switch->chandef.chan->hw_value;
 	cmd->switch_time = ch_switch->count;
 	cmd->stop_tx = ch_switch->block_tx;
 

drivers/net/wireless/ti/wl18xx/cmd.c

···
 	}
 
 	cmd->role_id = wlvif->role_id;
-	cmd->channel = ch_switch->channel->hw_value;
+	cmd->channel = ch_switch->chandef.chan->hw_value;
 	cmd->switch_time = ch_switch->count;
 	cmd->stop_tx = ch_switch->block_tx;
 
-	switch (ch_switch->channel->band) {
+	switch (ch_switch->chandef.chan->band) {
 	case IEEE80211_BAND_2GHZ:
 		cmd->band = WLCORE_BAND_2_4GHZ;
 		break;
···
 		break;
 	default:
 		wl1271_error("invalid channel switch band: %d",
-			     ch_switch->channel->band);
+			     ch_switch->chandef.chan->band);
 		ret = -EINVAL;
 		goto out_free;
 	}

include/linux/ieee80211.h

···
 } __packed;
 
 /**
+ * struct ieee80211_sec_chan_offs_ie - secondary channel offset IE
+ * @sec_chan_offs: secondary channel offset, uses IEEE80211_HT_PARAM_CHA_SEC_*
+ *	values here
+ * This structure represents the "Secondary Channel Offset element"
+ */
+struct ieee80211_sec_chan_offs_ie {
+	u8 sec_chan_offs;
+} __packed;
+
+/**
  * struct ieee80211_tim
  *
  * This structure refers to "Traffic Indication Map information element"
···
 
 	WLAN_EID_HT_CAPABILITY = 45,
 	WLAN_EID_HT_OPERATION = 61,
+	WLAN_EID_SECONDARY_CHANNEL_OFFSET = 62,
 
 	WLAN_EID_RSN = 48,
 	WLAN_EID_MMIE = 76,

include/net/mac80211.h

···
  *	the driver passed into mac80211.
  * @block_tx: Indicates whether transmission must be blocked before the
  *	scheduled channel switch, as indicated by the AP.
- * @channel: the new channel to switch to
+ * @chandef: the new channel to switch to
  * @count: the number of TBTT's until the channel switch event
  */
 struct ieee80211_channel_switch {
 	u64 timestamp;
 	bool block_tx;
-	struct ieee80211_channel *channel;
+	struct cfg80211_chan_def chandef;
 	u8 count;
 };
 

net/mac80211/ieee80211_i.h

···
 	enum mac80211_scan_state next_scan_state;
 	struct delayed_work scan_work;
 	struct ieee80211_sub_if_data __rcu *scan_sdata;
-	struct ieee80211_channel *csa_channel;
+	struct cfg80211_chan_def csa_chandef;
 	/* For backward compatibility only -- do not use */
 	struct cfg80211_chan_def _oper_chandef;
 
···
 	const u8 *pwr_constr_elem;
 	const struct ieee80211_timeout_interval_ie *timeout_int;
 	const u8 *opmode_notif;
+	const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
 
 	/* length of them, respectively */
 	u8 ssid_len;

net/mac80211/mlme.c

···
 	} else {
 		/* 40 MHz (and 80 MHz) must be supported for VHT */
 		ret = IEEE80211_STA_DISABLE_VHT;
+		/* also mark 40 MHz disabled */
+		ret |= IEEE80211_STA_DISABLE_40MHZ;
 		goto out;
 	}
 
···
 	if (!ifmgd->associated)
 		goto out;
 
-	/*
-	 * FIXME: Here we are downgrading to NL80211_CHAN_WIDTH_20_NOHT
-	 * and don't adjust our ht/vht settings
-	 * This is wrong - we should behave according to the CSA params
-	 */
-	local->_oper_chandef.chan = local->csa_channel;
-	local->_oper_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
-	local->_oper_chandef.center_freq1 =
-		local->_oper_chandef.chan->center_freq;
-	local->_oper_chandef.center_freq2 = 0;
+	local->_oper_chandef = local->csa_chandef;
 
 	if (!local->ops->channel_switch) {
 		/* call "hw_config" only if doing sw channel switch */
···
 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 	struct cfg80211_bss *cbss = ifmgd->associated;
 	struct ieee80211_bss *bss;
-	struct ieee80211_channel *new_ch;
 	struct ieee80211_chanctx *chanctx;
 	enum ieee80211_band new_band;
 	int new_freq;
 	u8 new_chan_no;
 	u8 count;
 	u8 mode;
+	struct cfg80211_chan_def new_chandef = {};
+	int secondary_channel_offset = -1;
 
 	ASSERT_MGD_MTX(ifmgd);
 
···
 	/* disregard subsequent announcements if we are already processing */
 	if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 		return;
+
+	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
+		/* if HT is enabled and the IE not present, it's still HT */
+		secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
+		if (elems->sec_chan_offs)
+			secondary_channel_offset =
+				elems->sec_chan_offs->sec_chan_offs;
+	}
+
+	if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
+	    (secondary_channel_offset == IEEE80211_HT_PARAM_CHA_SEC_ABOVE ||
+	     secondary_channel_offset == IEEE80211_HT_PARAM_CHA_SEC_BELOW))
+		secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
 
 	if (elems->ext_chansw_ie) {
 		if (!ieee80211_operating_class_to_band(
···
 	bss = (void *)cbss->priv;
 
 	new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
-	new_ch = ieee80211_get_channel(local->hw.wiphy, new_freq);
-	if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
+	new_chandef.chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
+	if (!new_chandef.chan ||
+	    new_chandef.chan->flags & IEEE80211_CHAN_DISABLED) {
 		sdata_info(sdata,
 			   "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
 			   ifmgd->associated->bssid, new_freq);
+		ieee80211_queue_work(&local->hw,
+				     &ifmgd->csa_connection_drop_work);
+		return;
+	}
+
+	switch (secondary_channel_offset) {
+	default:
+		/* secondary_channel_offset was present but is invalid */
+	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
+		cfg80211_chandef_create(&new_chandef, new_chandef.chan,
+					NL80211_CHAN_HT20);
+		break;
+	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
+		cfg80211_chandef_create(&new_chandef, new_chandef.chan,
+					NL80211_CHAN_HT40PLUS);
+		break;
+	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
+		cfg80211_chandef_create(&new_chandef, new_chandef.chan,
+					NL80211_CHAN_HT40MINUS);
+		break;
+	case -1:
+		cfg80211_chandef_create(&new_chandef, new_chandef.chan,
+					NL80211_CHAN_NO_HT);
+		break;
+	}
+
+	if (!cfg80211_chandef_usable(local->hw.wiphy, &new_chandef,
+				     IEEE80211_CHAN_DISABLED)) {
+		sdata_info(sdata,
+			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
+			   ifmgd->associated->bssid, new_freq,
+			   new_chandef.width, new_chandef.center_freq1,
+			   new_chandef.center_freq2);
 		ieee80211_queue_work(&local->hw,
 				     &ifmgd->csa_connection_drop_work);
 		return;
···
 	}
 	mutex_unlock(&local->chanctx_mtx);
 
-	local->csa_channel = new_ch;
+	local->csa_chandef = new_chandef;
 
 	if (mode)
 		ieee80211_stop_queues_by_reason(&local->hw,
···
 		struct ieee80211_channel_switch ch_switch = {
 			.timestamp = timestamp,
 			.block_tx = mode,
-			.channel = new_ch,
+			.chandef = new_chandef,
 			.count = count,
 		};
 

net/mac80211/trace.h

···
 
 	TP_STRUCT__entry(
 		LOCAL_ENTRY
+		CHANDEF_ENTRY
 		__field(u64, timestamp)
 		__field(bool, block_tx)
-		__field(u16, freq)
 		__field(u8, count)
 	),
 
 	TP_fast_assign(
 		LOCAL_ASSIGN;
+		CHANDEF_ASSIGN(&ch_switch->chandef)
 		__entry->timestamp = ch_switch->timestamp;
 		__entry->block_tx = ch_switch->block_tx;
-		__entry->freq = ch_switch->channel->center_freq;
 		__entry->count = ch_switch->count;
 	),
 
 	TP_printk(
-		LOCAL_PR_FMT " new freq:%u count:%d",
-		LOCAL_PR_ARG, __entry->freq, __entry->count
+		LOCAL_PR_FMT " new " CHANDEF_PR_FMT " count:%d",
+		LOCAL_PR_ARG, CHANDEF_PR_ARG, __entry->count
 	)
 );
 

net/mac80211/util.c

···
 		case WLAN_EID_COUNTRY:
 		case WLAN_EID_PWR_CONSTRAINT:
 		case WLAN_EID_TIMEOUT_INTERVAL:
+		case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 			if (test_bit(id, seen_elems)) {
 				elems->parse_error = true;
 				left -= elen;
···
 				break;
 			}
 			elems->ext_chansw_ie = (void *)pos;
+			break;
+		case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
+			if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
+				elem_parse_failed = true;
+				break;
+			}
+			elems->sec_chan_offs = (void *)pos;
 			break;
 		case WLAN_EID_COUNTRY:
 			elems->country_elem = pos;