mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-23 02:01:55 +00:00
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/*
|
|
* BIRD -- IP Addresses et Cetera for IPv6
|
|
*
|
|
* (c) 1999--2000 Martin Mares <mj@ucw.cz>
|
|
*
|
|
* Can be freely distributed and used under the terms of the GNU GPL.
|
|
*/
|
|
|
|
#ifndef _BIRD_IPV6_H_
|
|
#define _BIRD_IPV6_H_
|
|
|
|
#include <netinet/in.h>
|
|
#include "lib/string.h"
|
|
|
|
typedef struct ipv6_addr {
|
|
u32 addr[4];
|
|
} ip_addr;
|
|
|
|
#define _MI(a,b,c,d) ((struct ipv6_addr) {{ a, b, c, d }})
|
|
#define _I0(a) ((a).addr[0])
|
|
#define _I1(a) ((a).addr[1])
|
|
#define _I2(a) ((a).addr[2])
|
|
#define _I3(a) ((a).addr[3])
|
|
|
|
#define BITS_PER_IP_ADDRESS 128
|
|
#define STD_ADDRESS_P_LENGTH 39
|
|
|
|
#define IPA_NONE _MI(0,0,0,0)
|
|
|
|
#define ipa_equal(x,y) (!memcmp(&(x),&(y),sizeof(ip_addr)))
|
|
#define ipa_nonzero(x) ({ ip_addr _a=(x); (_I0(_a) || _I1(_a) || _I2(_a) || _I3(_a)); })
|
|
#define ipa_and(x,y) ({ ip_addr _a=(x), _b=(y); \
|
|
_MI(_I0(_a) & _I0(_b), \
|
|
_I1(_a) & _I1(_b), \
|
|
_I2(_a) & _I2(_b), \
|
|
_I3(_a) & _I3(_b)); })
|
|
#define ipa_or(x,y) ({ ip_addr _a=(x), _b=(y); \
|
|
_MI(_I0(_a) | _I0(_b), \
|
|
_I1(_a) | _I1(_b), \
|
|
_I2(_a) | _I2(_b), \
|
|
_I3(_a) | _I3(_b)); })
|
|
#define ipa_xor(x,y) ({ ip_addr _a=(x), _b=(y); \
|
|
_MI(_I0(_a) ^ _I0(_b), \
|
|
_I1(_a) ^ _I1(_b), \
|
|
_I2(_a) ^ _I2(_b), \
|
|
_I3(_a) ^ _I3(_b)); })
|
|
#define ipa_not(x) ({ ip_addr _a=(x); _MI(~_I0(_a),~_I1(_a),~_I2(_a),~_I3(_a)); })
|
|
#define ipa_mkmask(x) ipv6_mkmask(x)
|
|
#define ipa_mklen(x) ipv6_mklen(&(x))
|
|
#define ipa_hash(x) ipv6_hash(&(x))
|
|
#define ipa_hton(x) ipv6_hton(&(x))
|
|
#define ipa_ntoh(x) ipv6_ntoh(&(x))
|
|
#define ipa_classify(x) ipv6_classify(&(x))
|
|
/* ipa_opposite and ipa_class_mask don't make sense with IPv6 */
|
|
/* ipa_from_u32 and ipa_to_u32 replaced by ipa_build */
|
|
#define ipa_build(a,b,c,d) _MI(a,b,c,d)
|
|
#define ipa_compare(x,y) ipv6_compare(x,y)
|
|
#define ipa_absolutize(x,y) ipv6_absolutize(x,y)
|
|
|
|
ip_addr ipv6_mkmask(unsigned);
|
|
unsigned ipv6_mklen(ip_addr *);
|
|
int ipv6_classify(ip_addr *);
|
|
void ipv6_hton(ip_addr *);
|
|
void ipv6_ntoh(ip_addr *);
|
|
int ipv6_compare(ip_addr, ip_addr);
|
|
int ipv4_pton_u32(char *, u32 *);
|
|
void ipv6_absolutize(ip_addr *, ip_addr *);
|
|
|
|
/*
|
|
* This hash function looks well, but once IPv6 enters
|
|
* mainstream use, we need to check that it has good
|
|
* distribution properties on real routing tables.
|
|
*/
|
|
|
|
static inline unsigned ipv6_hash(ip_addr *a)
|
|
{
|
|
/* Returns a 16-bit hash key */
|
|
u32 x = _I0(*a) ^ _I1(*a) ^ _I2(*a) ^ _I3(*a);
|
|
return (x ^ (x >> 16) ^ (x >> 8)) & 0xffff;
|
|
}
|
|
|
|
/*
|
|
* RFC 1883 defines packet precendece, but RFC 2460 replaces it
|
|
* by generic Traffic Class ID with no defined semantics. Better
|
|
* not use it yet.
|
|
*/
|
|
#define IP_PREC_INTERNET_CONTROL -1
|
|
|
|
#endif
|