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The purpose of Multi-AP specification is to enable inter-operability across Wi-Fi access points (APs) from different vendors. This patch introduces one new configuration parameter 'multi_ap' to enable Multi-AP functionality and to configure the BSS as a backhaul and/or fronthaul BSS. Advertise vendor specific Multi-AP capabilities in (Re)Association Response frame, if Multi-AP functionality is enabled through the configuration parameter. A backhaul AP must support receiving both 3addr and 4addr frames from a backhaul STA, so create a VLAN for it just like is done for WDS, i.e., by calling hostapd_set_wds_sta(). Since Multi-AP requires WPA2 (never WEP), we can safely call hostapd_set_wds_encryption() as well and we can reuse the entire WDS condition. To parse the Multi-AP Extension subelement, we use get_ie(): even though that function is meant for parsing IEs, it works for subelements. Signed-off-by: Venkateswara Naralasetty <vnaralas@codeaurora.org> Signed-off-by: Jouni Malinen <jouni@codeaurora.org> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>