Source code of Windows XP (NT5)
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//============================================================================
// Copyright (c) 1995, Microsoft Corporation
//
// File: defs.h
//
// History:
// Abolade Gbadegesin Aug-7-1995 Created.
//
// Contains miscellaneous definitions and declarations
//============================================================================
#ifndef _DEFS_H_
#define _DEFS_H_
//
// type definitions for IPRIP network packet templates
//
#pragma pack(1)
typedef struct _IPRIP_HEADER {
BYTE IH_Command; BYTE IH_Version; WORD IH_Reserved;
} IPRIP_HEADER, *PIPRIP_HEADER;
typedef struct _IPRIP_ENTRY {
WORD IE_AddrFamily; WORD IE_RouteTag; DWORD IE_Destination; DWORD IE_SubnetMask; DWORD IE_Nexthop; DWORD IE_Metric;
} IPRIP_ENTRY, *PIPRIP_ENTRY;
typedef struct _IPRIP_AUTHENT_ENTRY {
WORD IAE_AddrFamily; WORD IAE_AuthType; BYTE IAE_AuthKey[IPRIP_MAX_AUTHKEY_SIZE];
} IPRIP_AUTHENT_ENTRY, *PIPRIP_AUTHENT_ENTRY;
#pragma pack()
#define ADDRFAMILY_REQUEST 0
#define ADDRFAMILY_INET ntohs(AF_INET)
#define ADDRFAMILY_AUTHENT 0xFFFF
#define MIN_PACKET_SIZE (sizeof(IPRIP_HEADER) + sizeof(IPRIP_ENTRY))
#define MAX_PACKET_SIZE 512
#define MAX_PACKET_ENTRIES \
((MAX_PACKET_SIZE - sizeof(IPRIP_HEADER)) / sizeof(IPRIP_ENTRY))#define MAX_UPDATE_REQUESTS 3
//
// this structure exists so that a RIP packet can be copied
// via structure-assignment rather than having to call CopyMemory
//
typedef struct _IPRIP_PACKET {
BYTE IP_Packet[MAX_PACKET_SIZE];
} IPRIP_PACKET, *PIPRIP_PACKET;
//
// definitions for IPRIP packet fields
//
#define IPRIP_PORT 520
#define IPRIP_REQUEST 1
#define IPRIP_RESPONSE 2
#define IPRIP_INFINITE 16
#define IPRIP_MULTIADDR ((DWORD)0x090000E0)
//
// Time conversion constants and macros
//
#define SYSTIME_UNITS_PER_MSEC (1000 * 10)
#define SYSTIME_UNITS_PER_SEC (1000 * SYSTIME_UNITS_PER_MSEC)
//
// macro to get system time in 100-nanosecond units
//
#define RipQuerySystemTime(p) NtQuerySystemTime((p))
//
// macros to convert time between 100-nanosecond, 1millsec, and 1 sec units
//
#define RipSystemTimeToMillisecs(p) { \
DWORD _r; \ *(p) = RtlExtendedLargeIntegerDivide(*(p), SYSTIME_UNITS_PER_MSEC, &_r);\}
#define RipMillisecsToSystemTime(p) \
*(p) = RtlExtendedIntegerMultiply(*(p), SYSTIME_UNITS_PER_MSEC)
#define RipSecsToSystemTime(p) \
*(p) = RtlExtendedIntegerMultiply(*(p), SYSTIME_UNITS_PER_SEC)
#define RipSecsToMilliSecs(p) \
(p) * 1000
//
// Network classification constants and macros
//
#define CLASSA_MASK ((DWORD)0x000000ff)
#define CLASSB_MASK ((DWORD)0x0000ffff)
#define CLASSC_MASK ((DWORD)0x00ffffff)
#define CLASSD_MASK ((DWORD)0x000000e0)
#define CLASSE_MASK ((DWORD)0xffffffff)
#define CLASSA_ADDR(a) (((*((PBYTE)&(a))) & 0x80) == 0)
#define CLASSB_ADDR(a) (((*((PBYTE)&(a))) & 0xc0) == 0x80)
#define CLASSC_ADDR(a) (((*((PBYTE)&(a))) & 0xe0) == 0xc0)
#define CLASSD_ADDR(a) (((*((PBYTE)&(a))) & 0xf0) == 0xe0)
//
// NOTE:
// This check for class E addresses doesn't weed out the address range from
// 248.0.0.0 to 255.255.255.254
//
#define CLASSE_ADDR(a) ((((*((PBYTE)&(a)))& 0xf0) == 0xf0) && \
((a) != 0xffffffff))
#define IS_LOOPBACK_ADDR(a) (((a) & 0xff) == 0x7f)
//
// Checks if the address is a broadcast
// Determines the class of the address passed in, and then uses the net mask
// corresponding to that class to determine if it is a broadcast address.
// Also identifies an all 1's address as a broadcast address.
// This macro can't be used for identifying subnet directed broadcasts
//
#define IS_BROADCAST_ADDR(a) \
((a) == INADDR_BROADCAST || \ (CLASSA_ADDR(a) && (((a) & ~CLASSA_MASK) == ~CLASSA_MASK)) || \ (CLASSB_ADDR(a) && (((a) & ~CLASSB_MASK) == ~CLASSB_MASK)) || \ (CLASSC_ADDR(a) && (((a) & ~CLASSC_MASK) == ~CLASSC_MASK)))
//
// Checks if the address is a directed broadcast
// The ~mask == TRUE check makes sure that host addresses with a mask
// of all ones, don't get classified as directed broadcasts
// But this also means that anytime the mask is all 1's (which is what
// NETCLASS_MASK macro returns, if the address passed in is not an A, B, C or
// D class address) the IS_DIRECTED_BROADCAST macro will return 0
//
#define IS_DIRECTED_BROADCAST_ADDR(a, mask) \
( (~(mask)) && (((a) & ~(mask)) == ~(mask)) )
//
// checks if an address is 255.255.255.255
//
#define IS_LOCAL_BROADCAST_ADDR(a) \
( (a) == INADDR_BROADCAST )
#define HOSTADDR_MASK 0xffffffff
#define NETCLASS_MASK(a) \
(CLASSA_ADDR(a) ? CLASSA_MASK : \ (CLASSB_ADDR(a) ? CLASSB_MASK : \ (CLASSC_ADDR(a) ? CLASSC_MASK : \ (CLASSD_ADDR(a) ? CLASSD_MASK : CLASSE_MASK))))
//
// This macro compares two IP addresses in network order by
// masking off each pair of octets and doing a subtraction;
// the result of the final subtraction is stored in the third argument.
//
#define INET_CMP(a,b,c) \
(((c) = (((a) & 0x000000ff) - ((b) & 0x000000ff))) ? (c) : \ (((c) = (((a) & 0x0000ff00) - ((b) & 0x0000ff00))) ? (c) : \ (((c) = (((a) & 0x00ff0000) - ((b) & 0x00ff0000))) ? (c) : \ (((c) = ((((a)>>8) & 0x00ff0000) - (((b)>>8) & 0x00ff0000)))))))
#define IPV4_ADDR_LEN 32
#define IPV4_SOURCE_MASK 0xFFFFFFFF
#endif // _DEFS_H_
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