84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
#ifndef __mrouter_packet_h
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#pragma option push -b -a8 -pc -A- /*P_O_Push*/
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#define __mrouter_packet_h
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#include <assert.h>
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typedef struct PACKET_BUFFER PACKET_BUFFER;
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typedef struct PACKET_LIST_ENTRY PACKET_LIST_ENTRY;
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typedef void (*PACKET_COMPLETION_FUNC) (PACKET_BUFFER *);
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struct PACKET_LIST_ENTRY
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{
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LIST_ENTRY ListEntry;
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PACKET_BUFFER * PacketBuffer;
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};
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#define PACKET_BUFFER_ADDRESS_MAX 16
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struct PACKET_BUFFER
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{
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LPBYTE Data; // storage for packet data
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LPBYTE Start; // where the data begins, must be offset from Data
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DWORD Length; // how long the data is, relative to Start
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DWORD Max; // the maximum length of buffer, within Data
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union {
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DWORD Context; // for use by the originator of the packet
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PVOID ContextPointer; // for use by the originator, but safe for 64-bit
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};
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WORD Protocol; // see below
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WORD AddressLength;
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BYTE Address [PACKET_BUFFER_ADDRESS_MAX];
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PACKET_COMPLETION_FUNC CompletionFunc;
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LONG ReferenceCount; // use interlocked access, do not access directly
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LIST_ENTRY ListEntry; // for use only by the originator of the packet
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};
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#define PACKET_BUFFER_PROTOCOL_IP 0x0000
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#define PACKET_BUFFER_PROTOCOL_VBI_RAW 0x0001
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#define PACKET_BUFFER_PROTOCOL_DSS_ARP 0x0002
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#define PACKET_BUFFER_PROTOCOL_DSS_RAW 0x0003
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#define PACKET_BUFFER_PROTOCOL_DSS_MPT 0x0004
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// PACKET_BUFFER_PROTOCOL_IP
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// packet body is a full IP packet, including header and body
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// IP address should be extracted from the message body
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// address field is not used
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// PACKET_BUFFER_PROTOCOL_DSS_RAW
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// the address field is not used
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// the packet length must be 130 bytes.
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// the packet is a standard DSS frame: 3 bytes of header
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// and 127 bytes of payload
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// PACKET_BUFFER_PROTOCOL_DSS_MPT
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// the address field may or may not be specified
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// the address field is the sub-SCID ID
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// if the address is not specified, the output driver should build the
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// sub-SCID like an Ethernet MAC address. this only works for multicast packets,
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// which have a fixed, deterministic IP address to MAC address mapping.
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// if the address field exists (length is not zero), then the
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// address length must be 6 and the address must contain an MPT sub-SCID ID.
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static __inline void PacketBufferComplete (PACKET_BUFFER * packet)
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{
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assert (packet);
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assert (packet -> CompletionFunc);
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(*packet -> CompletionFunc) (packet);
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}
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static __inline void PacketBufferAddRef (PACKET_BUFFER * packet) {
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assert (packet);
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InterlockedIncrement (&packet -> ReferenceCount);
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}
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static __inline void PacketBufferRelease (PACKET_BUFFER * packet) {
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assert (packet);
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if (!InterlockedDecrement (&packet -> ReferenceCount))
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PacketBufferComplete (packet);
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}
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#pragma option pop /*P_O_Pop*/
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#endif // __mrouter_packet_h
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