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/*-------------------------------------------------------------------------
*
* inet.h
* Declarations for operations on INET datatypes.
*
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/utils/inet.h
*
*-------------------------------------------------------------------------
*/
#ifndef INET_H
#define INET_H
#include "fmgr.h"
/*
* This is the internal storage format for IP addresses
* (both INET and CIDR datatypes):
*/
typedef struct
{
unsigned char family; /* PGSQL_AF_INET or PGSQL_AF_INET6 */
unsigned char bits; /* number of bits in netmask */
unsigned char ipaddr[16]; /* up to 128 bits of address */
} inet_struct;
/*
* We use these values for the "family" field.
*
* Referencing all of the non-AF_INET types to AF_INET lets us work on
* machines which may not have the appropriate address family (like
* inet6 addresses when AF_INET6 isn't present) but doesn't cause a
* dump/reload requirement. Pre-7.4 databases used AF_INET for the family
* type on disk.
*/
#define PGSQL_AF_INET (AF_INET + 0)
#define PGSQL_AF_INET6 (AF_INET + 1)
/*
* Both INET and CIDR addresses are represented within Postgres as varlena
* objects, ie, there is a varlena header in front of the struct type
* depicted above. This struct depicts what we actually have in memory
* in "uncompressed" cases. Note that since the maximum data size is only
* 18 bytes, INET/CIDR will invariably be stored into tuples using the
* 1-byte-header varlena format. However, we have to be prepared to cope
* with the 4-byte-header format too, because various code may helpfully
* try to "decompress" 1-byte-header datums.
*/
typedef struct
{
char vl_len_[4]; /* Do not touch this field directly! */
inet_struct inet_data;
} inet;
/*
* Access macros. We use VARDATA_ANY so that we can process short-header
* varlena values without detoasting them. This requires a trick:
* VARDATA_ANY assumes the varlena header is already filled in, which is
* not the case when constructing a new value (until SET_INET_VARSIZE is
* called, which we typically can't do till the end). Therefore, we
* always initialize the newly-allocated value to zeroes (using palloc0).
* A zero length word will look like the not-1-byte case to VARDATA_ANY,
* and so we correctly construct an uncompressed value.
*
* Note that ip_addrsize(), ip_maxbits(), and SET_INET_VARSIZE() require
* the family field to be set correctly.
*/
#define ip_family(inetptr) \
(((inet_struct *) VARDATA_ANY(inetptr))->family)
#define ip_bits(inetptr) \
(((inet_struct *) VARDATA_ANY(inetptr))->bits)
#define ip_addr(inetptr) \
(((inet_struct *) VARDATA_ANY(inetptr))->ipaddr)
#define ip_addrsize(inetptr) \
(ip_family(inetptr) == PGSQL_AF_INET ? 4 : 16)
#define ip_maxbits(inetptr) \
(ip_family(inetptr) == PGSQL_AF_INET ? 32 : 128)
#define SET_INET_VARSIZE(dst) \
SET_VARSIZE(dst, VARHDRSZ + offsetof(inet_struct, ipaddr) + \
ip_addrsize(dst))
/*
* This is the internal storage format for MAC addresses:
*/
typedef struct macaddr
{
unsigned char a;
unsigned char b;
unsigned char c;
unsigned char d;
unsigned char e;
unsigned char f;
} macaddr;
/*
* This is the internal storage format for MAC8 addresses:
*/
typedef struct macaddr8
{
unsigned char a;
unsigned char b;
unsigned char c;
unsigned char d;
unsigned char e;
unsigned char f;
unsigned char g;
unsigned char h;
} macaddr8;
/*
* fmgr interface macros
*/
#define DatumGetInetPP(X) ((inet *) PG_DETOAST_DATUM_PACKED(X))
#define InetPGetDatum(X) PointerGetDatum(X)
#define PG_GETARG_INET_PP(n) DatumGetInetPP(PG_GETARG_DATUM(n))
#define PG_RETURN_INET_P(x) return InetPGetDatum(x)
/* obsolescent variants */
#define DatumGetInetP(X) ((inet *) PG_DETOAST_DATUM(X))
#define PG_GETARG_INET_P(n) DatumGetInetP(PG_GETARG_DATUM(n))
/* macaddr is a fixed-length pass-by-reference datatype */
#define DatumGetMacaddrP(X) ((macaddr *) DatumGetPointer(X))
#define MacaddrPGetDatum(X) PointerGetDatum(X)
#define PG_GETARG_MACADDR_P(n) DatumGetMacaddrP(PG_GETARG_DATUM(n))
#define PG_RETURN_MACADDR_P(x) return MacaddrPGetDatum(x)
/* macaddr8 is a fixed-length pass-by-reference datatype */
#define DatumGetMacaddr8P(X) ((macaddr8 *) DatumGetPointer(X))
#define Macaddr8PGetDatum(X) PointerGetDatum(X)
#define PG_GETARG_MACADDR8_P(n) DatumGetMacaddr8P(PG_GETARG_DATUM(n))
#define PG_RETURN_MACADDR8_P(x) return Macaddr8PGetDatum(x)
/*
* Support functions in network.c
*/
extern inet *cidr_set_masklen_internal(const inet *src, int bits);
extern int bitncmp(const unsigned char *l, const unsigned char *r, int n);
extern int bitncommon(const unsigned char *l, const unsigned char *r, int n);
#endif /* INET_H */
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