openwrt/package/kernel/mac80211/patches/subsys/343-wifi-cfg80211-add-helper-for-checking-if-a-chandef-i.patch

From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 7 Jun 2024 17:58:54 +0200
Subject: [PATCH] wifi: cfg80211: add helper for checking if a chandef is
 valid on a radio

Check if the full channel width is in the radio's frequency range.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -6485,6 +6485,15 @@ static inline bool cfg80211_channel_is_p
 }
 
 /**
+ * cfg80211_radio_chandef_valid - Check if the radio supports the chandef
+ *
+ * @radio: wiphy radio
+ * @chandef: chandef for current channel
+ */
+bool cfg80211_radio_chandef_valid(const struct wiphy_radio *radio,
+				  const struct cfg80211_chan_def *chandef);
+
+/**
  * ieee80211_get_response_rate - get basic rate for a given rate
  *
  * @sband: the band to look for rates in
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -2884,3 +2884,38 @@ cfg80211_get_iftype_ext_capa(struct wiph
 	return NULL;
 }
 EXPORT_SYMBOL(cfg80211_get_iftype_ext_capa);
+
+static bool
+ieee80211_radio_freq_range_valid(const struct wiphy_radio *radio,
+				 u32 freq, u32 width)
+{
+	const struct wiphy_radio_freq_range *r;
+	int i;
+
+	for (i = 0; i < radio->n_freq_range; i++) {
+		r = &radio->freq_range[i];
+		if (freq - width / 2 >= r->start_freq &&
+		    freq + width / 2 <= r->end_freq)
+			return true;
+	}
+
+	return false;
+}
+
+bool cfg80211_radio_chandef_valid(const struct wiphy_radio *radio,
+				  const struct cfg80211_chan_def *chandef)
+{
+	u32 freq, width;
+
+	freq = ieee80211_chandef_to_khz(chandef);
+	width = nl80211_chan_width_to_mhz(chandef->width);
+	if (!ieee80211_radio_freq_range_valid(radio, freq, width))
+		return false;
+
+	freq = MHZ_TO_KHZ(chandef->center_freq2);
+	if (freq && !ieee80211_radio_freq_range_valid(radio, freq, width))
+		return false;
+
+	return true;
+}
+EXPORT_SYMBOL(cfg80211_radio_chandef_valid);