Class IPv4Packet

Inheritance Relationships

Base Type

Class Documentation

class IPv4Packet : public ska::pst::recv::PacketBuffer

Internet Protocol version 4 (IPV4) Interface to raw data stored in memory.

Public Functions

IPv4Packet() = default

Construct a new IPv4Packet object.

IPv4Packet(char *ptr, size_t size)

Construct a new IPv4Packet object from an existing address and size.

Parameters

  • ptr – memory address of the packet

  • size – length of the packet

inline uint8_t version_ihl() const

Return the version and internet headler length of the packet.

inline uint8_t dscp_ecn() const

Return the Differentiated Services Code Point of the packet.

inline uint16_t total_length() const

Return the total length (header and data) of the packet in bytes.

inline uint16_t identification() const

Return the IPv4 Identification field of the packet.

inline uint16_t flags_frag_off() const

Return the Flags and Fragment Offset field of the packet.

inline uint8_t ttl() const

Return the Time to Live field of the packet.

inline uint8_t protocol() const

Return the Protocol field of the packet.

inline uint16_t checksum() const

Return the Header Checksum field of the packet.

inline ip_addr_v4 source_address() const

Return the IPv4 source address field of the packet.

inline ip_addr_v4 destination_address() const

Return the IPv4 destination address field of the packet.

bool is_fragment() const

Return true if the packet is fragmented.

size_t header_length() const

Return the length of the header in bytes.

int version() const

Return the version of the packet.

UDPPacket payload_udp() const

Return a UDP packet payload interface to the IPv4 frame payload.

Public Static Attributes

static constexpr size_t min_size = 20

minimum size of an IPv4 packet

static constexpr uint16_t ethertype = 0x0800

value for the ethertype field in an IPv4 packet

static constexpr uint16_t flag_do_not_fragment = 0x4000

value of flags_frag_off field for do not fragment

static constexpr uint16_t flag_more_fragments = 0x2000

value of flags_frag_off field for more fragments

static constexpr uint16_t flag_more_fragments_bitmask = 0x1fff

bitmask to apply to flag_more_fragments to extract value

static constexpr uint8_t header_length_bitmask = 0xf

bitmask to applyo version_ihl() output to return header length