pppoe_session_listen_ifname
pppoe_session_listen_ifname(pppoe),
pppoe_session_listen_ifname(_this), _this->session_id, fmt);
sdl.sdl_index = if_nametoindex(pppoe_session_listen_ifname(_this));
len = strlen(pppoe_session_listen_ifname(_this));
memcpy(sdl.sdl_data, pppoe_session_listen_ifname(_this), len);