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