The previous version had a bug that could result in NULL pointer
dereference if the P2P IE included Manageability attribute, but no
Capability attribute.
If enabled, cross connection allows GO to forward IPv4 packets
using masquerading NAT from the P2P clients in the group to an
uplink WLAN connection. This is disabled by default and can be
enabled with "wpa_cli p2p_set cross_connect 1" on the P2P device
interface.