L2TP_CTRL_ASSERT
L2TP_CTRL_ASSERT(sz <= _this->buffercnt);
L2TP_CTRL_ASSERT(peer != NULL);
L2TP_CTRL_ASSERT(sock != NULL);
L2TP_CTRL_ASSERT(_this != NULL);
L2TP_CTRL_ASSERT(_this != NULL);
L2TP_CTRL_ASSERT(_this != NULL)
L2TP_CTRL_ASSERT(_this->state == L2TP_CTRL_STATE_ESTABLISHED ||
L2TP_CTRL_ASSERT(_this != NULL);
L2TP_CTRL_ASSERT(_this != NULL);
L2TP_CTRL_ASSERT(_this != NULL);
L2TP_CTRL_ASSERT(_this != NULL);
L2TP_CTRL_ASSERT(_this != NULL);
L2TP_CTRL_ASSERT(peer->sa_family == sock->sa_family);
L2TP_CTRL_ASSERT(peer->sa_family == AF_INET ||
L2TP_CTRL_ASSERT(pkt - pkt0 == reqlen);