93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
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#ifndef CAM_SSP_HPP_GGBE8KES
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#define CAM_SSP_HPP_GGBE8KES
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#include <vanetza/common/byte_buffer.hpp>
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#include <cstdint>
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#include <set>
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#include <string>
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namespace vanetza
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{
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namespace security
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{
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/**
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* CAM permission bits
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*
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* These bitmasks describe CA station roles, e.g. emergency vehicles.
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* Some CAM data containers are linked to these roles. Misuse is opposed by checking CAM SSPs.
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*
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* \see EN 302 637-2 V1.3.2, Table 4
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*/
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enum class CamPermission : uint16_t
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{
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// first octet
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CEN_DSRC_Tolling_Zone = 0x80,
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Public_Transport = 0x40,
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Special_Transport = 0x20,
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Dangerous_Goods = 0x10,
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Roadwork = 0x08,
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Rescue = 0x04,
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Emergency = 0x02,
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Safety_Car = 0x01,
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// second octet
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Closed_Lanes = 0x8000,
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Request_For_Right_Of_Way = 0x4000,
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Request_For_Free_Crossing_At_Traffic_Light = 0x2000,
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No_Passing = 0x1000,
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No_Passing_For_Trucks = 0x0800,
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Speed_Limit = 0x0400,
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// 0x0200 and 0x0100 are reserved for future usage
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};
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/**
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* Set of CAM permissions, i.e. Service Specific Permissions
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*
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* \see EN 302 637-2 V1.3.2, section 6.2.2.2
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*/
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class CamPermissions
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{
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public:
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CamPermissions();
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CamPermissions(CamPermission);
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CamPermissions(const std::initializer_list<CamPermission>&);
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// check for permission
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bool has(CamPermission) const;
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bool has(const std::initializer_list<CamPermission>&) const;
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bool has(const CamPermissions&) const;
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bool none() const;
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/**
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* Get set of all included permissions
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* \return permission set
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*/
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std::set<CamPermission> permissions() const;
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// permission manipulation (with chaining)
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CamPermissions& add(CamPermission);
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CamPermissions& remove(CamPermission);
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// serialization helpers
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ByteBuffer encode() const;
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static CamPermissions decode(const ByteBuffer&);
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private:
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using value_type = std::underlying_type<CamPermission>::type;
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value_type m_bits;
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};
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/**
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* Get string representation of CAM permission flag
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* \param cp CAM permission flag
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* \return string representation (empty for unknown flags)
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*/
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std::string stringify(CamPermission);
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} // namespace security
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} // namespace vanetza
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#endif /* CAM_SSP_HPP_GGBE8KES */
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