hostapd: don't ignore probe-requests with invalid DSSS params

Don't ignore probe requests which contain an invalid DS parameter for the
current operating channel.

As the comment outlines, the drop shall only apply if
dot11RadioMeasurementActivated is set to 1.

However, it was observed Linux clients (Debian 12 / NixOS 23.11)
with an Intel 8265 NIC may generate a probe request frame with
dot11RadioMeasurementActivated set to false and an invalid DSSS
parameter.

These were also dropped even though they should not have been. They
however should not have contained this parameter in the first place.

Don't drop Probe Requests which contain such an invalid field. This may
lead to more probe responses being sent, however it does fix very
frequent connection issues for these clients on 2.4 GHz.

Signed-off-by: David Bauer <mail@david-bauer.net>
(cherry picked from commit 68e4cc9be5f6f485c2d3b00cf4e2f14e98aecee2)

diff --git a/package/network/services/hostapd/patches/762-AP-don-t-ignore-probe-requests-with-invalid-DSSS-par.patch b/package/network/services/hostapd/patches/762-AP-don-t-ignore-probe-requests-with-invalid-DSSS-par.patch
new file mode 100644 (file)
index 0000000..071de4f
--- /dev/null
+++ b/package/network/services/hostapd/patches/762-AP-don-t-ignore-probe-requests-with-invalid-DSSS-par.patch
@@ -0,0 +1,39 @@
+From a329773522953892d9bb4548482d42fc93fea329 Mon Sep 17 00:00:00 2001
+From: David Bauer <mail@david-bauer.net>
+Date: Thu, 27 Jun 2024 18:45:19 +0200
+Subject: [PATCH] AP: don't ignore probe-requests with invalid DSSS params
+
+Don't ignore probe requests which contain an invalid DS parameter for the
+current operating channel.
+
+As the comment outlines, the drop shall only apply if
+dot11RadioMeasurementActivated is set to 1.
+
+However, it was observed Linux clients (Debian 12 / NixOS 23.11)
+with an Intel 8265 NIC may generate a probe request frame with
+dot11RadioMeasurementActivated set to false and an invalid DSSS
+parameter.
+
+These were also dropped even though they should not have been. They
+however should not have contained this parameter in the first place.
+
+Don't drop Probe Requests which contain such an invalid field. This may
+lead to more probe responses being sent, however it does fix very
+frequent connection issues for these clients on 2.4 GHz.
+
+Signed-off-by: David Bauer <mail@david-bauer.net>
+---
+ src/ap/beacon.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/src/ap/beacon.c
++++ b/src/ap/beacon.c
+@@ -1095,7 +1095,7 @@ void handle_probe_req(struct hostapd_dat
+        * is less likely to see them (Probe Request frame sent on a
+        * neighboring, but partially overlapping, channel).
+        */
+-      if (elems.ds_params &&
++      if (elems.ds_params && 0 &&
+           hapd->iface->current_mode &&
+           (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G ||
+            hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211B) &&