Intel Extensible Firmware Interface - Manual (Page 949)

32/64-Bit UNDI Specification
Version 1.10 12/01/02 E-83
// Length of packet data in bytes (not including the media
// header).
PXE_UINT32 PacketLen;
// Protocol type. This will be copied into the media header
// without doing byte swapping. Protocol type numbers can be
// obtained from the Assigned Numbers RFC 1700.
PXE_UINT16 Protocol;
// Length of the media header in bytes.
PXE_UINT16 MediaHeaderLen;
} PXE_CPB_FILL_HEADER;
#pragma pack()
#define PXE_PROTOCOL_ETHERNET_IP 0x0800
#define PXE_PROTOCOL_ETHERNET_ARP 0x0806
Fragmented Frame
#pragma pack(1)
typedef struct s_pxe_cpb_fill_header_fragmented {
// Source and destination MAC addresses. These will be copied
// into the media header without doing byte swapping.
PXE_MAC_ADDR SrcAddr;
PXE_MAC_ADDR DestAddr;
// Length of packet data in bytes (not including the media
// header).
PXE_UINT32 PacketLen;
// Protocol type. This will be copied into the media header
// without doing byte swapping. Protocol type numbers can be
// obtained from the Assigned Numbers RFC 1700.
PXE_MEDIA_PROTOCOL Protocol;
// Length of the media header in bytes.
PXE_UINT16 MediaHeaderLen;
// Number of packet fragment descriptors.
PXE_UINT16 FragCnt;
// Reserved, must be set to zero.
PXE_UINT16 reserved;