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hostapd: prevent channel switch for 5GHz 

hostapd would switch the primary and secondary channel on 5GHz networks in
certain circumstances, completely breaking the adhoc interfaces of the WLAN
adapter (they would lose their configuration).

As a temporary fix, disable this channel switch function.
remotes/1699402720531464663/tmp_refs/heads/stable
Matthias Schiffer 2015-07-27 21:00:45 +02:00
parent b5ae418f05
commit e55a00edfd
1 changed files with 77 additions and 0 deletions
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77
patches/openwrt/0042-hostapd-prevent-channel-switch-for-5GHz.patch Normal file
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@ -0,0 +1,77 @@
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Mon, 27 Jul 2015 20:42:50 +0200
Subject: hostapd: prevent channel switch for 5GHz
hostapd would switch the primary and secondary channel on 5GHz networks in
certain circumstances, completely breaking the adhoc interfaces of the WLAN
adapter (they would lose their configuration).
As a temporary fix, disable this channel switch function.
diff --git a/package/network/services/hostapd/patches/472-no_channel_switch.patch b/package/network/services/hostapd/patches/472-no_channel_switch.patch
new file mode 100644
index 0000000..046969b
--- /dev/null
+++ b/package/network/services/hostapd/patches/472-no_channel_switch.patch
@@ -0,0 +1,61 @@
+--- a/src/ap/hw_features.c
++++ b/src/ap/hw_features.c
+@@ -339,58 +339,6 @@ static int ieee80211n_check_40mhz_5g(str
+ else
+ sec_freq = pri_freq - 20;
+
+- /*
+- * Switch PRI/SEC channels if Beacons were detected on selected SEC
+- * channel, but not on selected PRI channel.
+- */
+- pri_bss = sec_bss = 0;
+- for (i = 0; i < scan_res->num; i++) {
+- struct wpa_scan_res *bss = scan_res->res[i];
+- if (bss->freq == pri_freq)
+- pri_bss++;
+- else if (bss->freq == sec_freq)
+- sec_bss++;
+- }
+- if (sec_bss && !pri_bss) {
+- wpa_printf(MSG_INFO, "Switch own primary and secondary "
+- "channel to get secondary channel with no Beacons "
+- "from other BSSes");
+- ieee80211n_switch_pri_sec(iface);
+- return 1;
+- }
+-
+- /*
+- * Match PRI/SEC channel with any existing HT40 BSS on the same
+- * channels that we are about to use (if already mixed order in
+- * existing BSSes, use own preference).
+- */
+- match = 0;
+- for (i = 0; i < scan_res->num; i++) {
+- struct wpa_scan_res *bss = scan_res->res[i];
+- ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
+- if (pri_chan == bss_pri_chan &&
+- sec_chan == bss_sec_chan) {
+- match = 1;
+- break;
+- }
+- }
+- if (!match) {
+- for (i = 0; i < scan_res->num; i++) {
+- struct wpa_scan_res *bss = scan_res->res[i];
+- ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan,
+- &bss_sec_chan);
+- if (pri_chan == bss_sec_chan &&
+- sec_chan == bss_pri_chan) {
+- wpa_printf(MSG_INFO, "Switch own primary and "
+- "secondary channel due to BSS "
+- "overlap with " MACSTR,
+- MAC2STR(bss->bssid));
+- ieee80211n_switch_pri_sec(iface);
+- break;
+- }
+- }
+- }
+-
+ return 1;
+ }
+