From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 10 Jul 2026 10:23:19 +0000 (+0200)
Subject: hostapd: ucode: fix CSA bandwidth for 320 MHz and 80+80 channels
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b92df1e8da528eda036c15237ac1ce047d4bbcea;p=thirdparty%2Fopenwrt.git

hostapd: ucode: fix CSA bandwidth for 320 MHz and 80+80 channels

switch_channel computed the CSA bandwidth as 40 << oper_chwidth, which
mismaps oper_chwidth 3 (80+80, must be 80 MHz plus center_freq2) to 320
and 9 (320 MHz) to 20480. Map the operating channel width to the actual
MHz bandwidth explicitly.

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

diff --git a/package/network/services/hostapd/src/src/ap/ucode.c b/package/network/services/hostapd/src/src/ap/ucode.c
index e1a365b7a62..4db5eddf7c5 100644
--- a/package/network/services/hostapd/src/src/ap/ucode.c
+++ b/package/network/services/hostapd/src/src/ap/ucode.c
@@ -739,10 +739,22 @@ uc_hostapd_iface_switch_channel(uc_vm_t *vm, size_t nargs)
 	intval = ucv_int64_get(ucv_object_get(info, "oper_chwidth", NULL));
 	if (errno)
 		intval = hostapd_get_oper_chwidth(conf);
-	if (intval)
-		csa.freq_params.bandwidth = 40 << intval;
-	else
+	switch (intval) {
+	case CONF_OPER_CHWIDTH_80MHZ:
+	case CONF_OPER_CHWIDTH_80P80MHZ:
+		/* 80+80 uses an 80 MHz primary segment plus center_freq2 */
+		csa.freq_params.bandwidth = 80;
+		break;
+	case CONF_OPER_CHWIDTH_160MHZ:
+		csa.freq_params.bandwidth = 160;
+		break;
+	case CONF_OPER_CHWIDTH_320MHZ:
+		csa.freq_params.bandwidth = 320;
+		break;
+	default:
 		csa.freq_params.bandwidth = csa.freq_params.sec_channel_offset ? 40 : 20;
+		break;
+	}
 
 	if ((intval = ucv_int64_get(ucv_object_get(info, "frequency", NULL))) && !errno)
 		csa.freq_params.freq = intval;