EthLayer.h

#ifndef PACKETPP_ETH_LAYER
#define PACKETPP_ETH_LAYER

#include "Layer.h"
#include "MacAddress.h"

/// @file

/**
 * \namespace pcpp
 * \brief The main namespace for the PcapPlusPlus lib
 */
namespace pcpp
{

	/**
	 * @struct ether_header
	 * Represents an Ethernet II header
	 */
#pragma pack(push, 1)
	struct ether_header {
		/** Destination MAC */
		uint8_t dstMac[6];
		/** Source MAC */
		uint8_t srcMac[6];
		/** EtherType */
		uint16_t etherType;
	};
#pragma pack(pop)

	/* Ethernet protocol ID's */

	/** IP */
#define	PCPP_ETHERTYPE_IP		0x0800
	/** Address resolution */
#define	PCPP_ETHERTYPE_ARP		0x0806
	/** Reverse ARP */
#define	PCPP_ETHERTYPE_REVARP	0x8035
	/** AppleTalk protocol */
#define PCPP_ETHERTYPE_AT		0x809B
	/** AppleTalk ARP */
#define PCPP_ETHERTYPE_AARP		0x80F3
	/** IEEE 802.1Q VLAN tagging */
#define	PCPP_ETHERTYPE_VLAN		0x8100
	/** IPX */
#define PCPP_ETHERTYPE_IPX		0x8137
	/** IP protocol version 6 */
#define	PCPP_ETHERTYPE_IPV6		0x86dd
	/** used to test interfaces */
#define PCPP_ETHERTYPE_LOOPBACK	0x9000
	/** PPPoE discovery */
#define PCPP_ETHERTYPE_PPPOED	0x8863
	/** PPPoE session */
#define PCPP_ETHERTYPE_PPPOES	0x8864
	/** MPLS */
#define PCPP_ETHERTYPE_MPLS		0x8847
	/** Point-to-point protocol (PPP) */
#define PCPP_ETHERTYPE_PPP		0x880B


	/**
	 * @class EthLayer
	 * Represents an Ethernet II protocol layer
	 */
	class EthLayer : public Layer
	{
	public:
		/**
		 * A constructor that creates the layer from an existing packet raw data
		 * @param[in] data A pointer to the raw data (will be casted to ether_header)
		 * @param[in] dataLen Size of the data in bytes
		 * @param[in] packet A pointer to the Packet instance where layer will be stored in
		 */
		EthLayer(uint8_t* data, size_t dataLen, Packet* packet) : Layer(data, dataLen, NULL, packet) { m_Protocol = Ethernet; }

		/**
		 * A constructor that creates the layer from an existing packet raw data
		 * @param[in] data A pointer to the raw data (will be casted to ether_header)
		 * @param[in] dataLen Size of the data in bytes
		 * @param[in] prevLayer A pointer to the previous layer
		 * @param[in] packet A pointer to the Packet instance where layer will be stored in
		 */
		EthLayer(uint8_t* data, size_t dataLen, Layer* prevLayer, Packet* packet) : Layer(data, dataLen, prevLayer, packet) { m_Protocol = Ethernet; }

		/**
		 * A constructor that creates a new Ethernet header and allocates the data
		 * @param[in] sourceMac The source MAC address
		 * @param[in] destMac The destination MAC address
		 * @param[in] etherType The EtherType to be used. It's an optional parameter, a value of 0 will be set if not provided
		 */
		EthLayer(const MacAddress& sourceMac, const MacAddress& destMac, uint16_t etherType = 0);

		~EthLayer() {}

		/**
		 * Get a pointer to the Ethernet header. Notice this points directly to the data, so every change will change the actual packet data
		 * @return A pointer to the ether_header
		 */
		ether_header* getEthHeader() const { return (ether_header*)m_Data; }

		/**
		 * Get the source MAC address
		 * @return The source MAC address
		 */
		MacAddress getSourceMac() const { return MacAddress(getEthHeader()->srcMac); }

		/**
		 * Set source MAC address
		 * @param sourceMac Source MAC to set
		 */
		void setSourceMac(const MacAddress& sourceMac) { sourceMac.copyTo(getEthHeader()->srcMac); }

		/**
		 * Get the destination MAC address
		 * @return The destination MAC address
		 */
		MacAddress getDestMac() const { return MacAddress(getEthHeader()->dstMac); }

		/**
		 * Set destination MAC address
		 * @param destMac Destination MAC to set
		 */
		void setDestMac(const MacAddress& destMac) { destMac.copyTo(getEthHeader()->dstMac); }

		// implement abstract methods

		/**
		 * Currently identifies the following next layers: IPv4Layer, IPv6Layer, ArpLayer, VlanLayer, PPPoESessionLayer, PPPoEDiscoveryLayer,
		 * MplsLayer.
		 * Otherwise sets PayloadLayer
		 */
		void parseNextLayer();

		/**
		 * @return Size of ether_header
		 */
		size_t getHeaderLen() const { return sizeof(ether_header); }

		/**
		 * Calculate ether_header#etherType for known protocols: IPv4, IPv6, ARP, VLAN
		 */
		void computeCalculateFields();

		std::string toString() const;

		OsiModelLayer getOsiModelLayer() const { return OsiModelDataLinkLayer; }
	};

} // namespace pcpp

#endif /* PACKETPP_ETH_LAYER */