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/*------------------------------------------------------------------------- * * inet.h * Declarations for operations on INET datatypes. * * * Portions Copyright (c) 1996-2016, 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; /* * 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. Existing 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; /* * fmgr interface macros */ #define DatumGetInetP(X) ((inet *) PG_DETOAST_DATUM(X)) #define DatumGetInetPP(X) ((inet *) PG_DETOAST_DATUM_PACKED(X)) #define InetPGetDatum(X) PointerGetDatum(X) #define PG_GETARG_INET_P(n) DatumGetInetP(PG_GETARG_DATUM(n)) #define PG_GETARG_INET_PP(n) DatumGetInetPP(PG_GETARG_DATUM(n)) #define PG_RETURN_INET_P(x) return InetPGetDatum(x) /* 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) /* * Support functions in network.c */ 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); /* * GiST support functions in network_gist.c */ extern Datum inet_gist_fetch(PG_FUNCTION_ARGS); extern Datum inet_gist_consistent(PG_FUNCTION_ARGS); extern Datum inet_gist_union(PG_FUNCTION_ARGS); extern Datum inet_gist_compress(PG_FUNCTION_ARGS); extern Datum inet_gist_decompress(PG_FUNCTION_ARGS); extern Datum inet_gist_penalty(PG_FUNCTION_ARGS); extern Datum inet_gist_picksplit(PG_FUNCTION_ARGS); extern Datum inet_gist_same(PG_FUNCTION_ARGS); /* * Estimation functions in network_selfuncs.c */ extern Datum networksel(PG_FUNCTION_ARGS); extern Datum networkjoinsel(PG_FUNCTION_ARGS); #endif /* INET_H */