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- 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/900-no_channel_switch.patch b/package/network/services/hostapd/patches/900-no_channel_switch.patch
- new file mode 100644
- index 0000000000000000000000000000000000000000..c6145156928ffa5a5195ca145b0655bb88c92091
- --- /dev/null
- +++ b/package/network/services/hostapd/patches/900-no_channel_switch.patch
- @@ -0,0 +1,68 @@
- +--- a/src/common/hw_features_common.c
- ++++ b/src/common/hw_features_common.c
- +@@ -171,7 +171,6 @@ int check_40mhz_5g(struct hostapd_hw_mod
- + struct wpa_scan_results *scan_res, int pri_chan,
- + int sec_chan)
- + {
- +- int pri_freq, sec_freq, pri_bss, sec_bss;
- + int bss_pri_chan, bss_sec_chan;
- + size_t i;
- + int match;
- +@@ -180,57 +179,6 @@ int check_40mhz_5g(struct hostapd_hw_mod
- + pri_chan == sec_chan)
- + return 0;
- +
- +- pri_freq = hw_get_freq(mode, pri_chan);
- +- sec_freq = hw_get_freq(mode, sec_chan);
- +-
- +- /*
- +- * 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");
- +- return 2;
- +- }
- +-
- +- /*
- +- * 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];
- +- 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];
- +- 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));
- +- return 2;
- +- }
- +- }
- +- }
- +-
- + return 1;
- + }
- +
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