Hi, In this patch, we fix a bug which is eapol rx packet drop in hostapd when interface configured to bridged AP mode. Issue scenario: When the AP interface needs to do scan for some reason, for instance: HT SCAN for bandwidth check. It needs to configure AP interface mode to STA. In current hostapd design, it will remove bridged link in temporary and add it back when scan done. But it doesn't add ifindex link back between bridged interface and AP interface. It will cause eapol rx packet drop in hostapd because eapol packet is being received from bridged interface. But it doesn't exist because it was removed when interface reconfigure to STA mode. Fix: Add ifindex link back when reset to AP mode. Related log, // HT scan causes interface(wlan3) re-configure to STA mode and it causes wlan3 delink with ap_br_wlan2 03-29 17:12:23.225 D/hostapd ( 8979): Receive wpa msg : ACS-COMPLETED freq=5180 channel=36 03-29 17:12:23.225 I/hostapd ( 8979): wlan3: interface state UNINITIALIZED->HT_SCAN 03-29 17:12:23.225 D/hostapd ( 8979): nl80211: Set mode ifindex 28 iftype 2 (STATION) 03-29 17:12:23.261 D/hostapd ( 8979): nl80211: Remove AP interface wlan3 temporarily from the bridge ap_br_wlan2 to allow its mode to be set to STATION 03-29 17:12:23.321 D/hostapd ( 8979): RTM_NEWLINK: ifi_index=29 ifname=ap_br_wlan2 operstate=6 linkmode=0 ifi_family=0 ifi_flags=0x11043 ([UP][RUNNING][LOWER_UP]) // After scanning, hostapd handle add interface (wlan3) back into the bridge ap_br_wlan2 but it doesn't add ifindex back 03-29 17:12:23.436 D/hostapd ( 8979): nl80211: Add AP interface wlan3 back into the bridge ap_br_wlan2
Attachment:
0001-hostapd-Fix-eapol-packet-drop-in-bridged-mode.patch
Description: Binary data
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