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/*
* IP address structure (for generic IPv4 or IPv6 address)
* Copyright (C) 2016, 2017 Cumulus Networks, Inc.
*
* This file is part of FRR.
*
* FRR is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* FRR is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with FRR; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifndef __IPADDR_H__
#define __IPADDR_H__
#include <zebra.h>
#include "lib/log.h"
#ifdef __cplusplus
extern "C" {
#endif
/*
* Generic IP address - union of IPv4 and IPv6 address.
*/
enum ipaddr_type_t {
IPADDR_NONE = AF_UNSPEC,
IPADDR_V4 = AF_INET,
IPADDR_V6 = AF_INET6,
};
struct ipaddr {
enum ipaddr_type_t ipa_type;
union {
uint8_t addr;
struct in_addr _v4_addr;
struct in6_addr _v6_addr;
} ip;
#define ipaddr_v4 ip._v4_addr
#define ipaddr_v6 ip._v6_addr
};
#define IS_IPADDR_NONE(p) ((p)->ipa_type == IPADDR_NONE)
#define IS_IPADDR_V4(p) ((p)->ipa_type == IPADDR_V4)
#define IS_IPADDR_V6(p) ((p)->ipa_type == IPADDR_V6)
#define SET_IPADDR_V4(p) (p)->ipa_type = IPADDR_V4
#define SET_IPADDR_V6(p) (p)->ipa_type = IPADDR_V6
#define IPADDRSZ(p) \
(IS_IPADDR_V4((p)) ? sizeof(struct in_addr) : sizeof(struct in6_addr))
static inline int ipaddr_family(const struct ipaddr *ip)
{
switch (ip->ipa_type) {
case IPADDR_V4:
return AF_INET;
case IPADDR_V6:
return AF_INET6;
default:
return AF_UNSPEC;
}
}
static inline int str2ipaddr(const char *str, struct ipaddr *ip)
{
int ret;
memset(ip, 0, sizeof(struct ipaddr));
ret = inet_pton(AF_INET, str, &ip->ipaddr_v4);
if (ret > 0) /* Valid IPv4 address. */
{
ip->ipa_type = IPADDR_V4;
return 0;
}
ret = inet_pton(AF_INET6, str, &ip->ipaddr_v6);
if (ret > 0) /* Valid IPv6 address. */
{
ip->ipa_type = IPADDR_V6;
return 0;
}
return -1;
}
static inline char *ipaddr2str(const struct ipaddr *ip, char *buf, int size)
{
buf[0] = '\0';
if (ip)
inet_ntop(ip->ipa_type, &ip->ip.addr, buf, size);
return buf;
}
#define IS_MAPPED_IPV6(A) \
((A)->s6_addr32[0] == 0x00000000 \
? ((A)->s6_addr32[1] == 0x00000000 \
? (ntohl((A)->s6_addr32[2]) == 0xFFFF ? 1 : 0) \
: 0) \
: 0)
/*
* Convert IPv4 address to IPv4-mapped IPv6 address which is of the
* form ::FFFF:<IPv4 address> (RFC 4291). This IPv6 address can then
* be used to represent the IPv4 address, wherever only an IPv6 address
* is required.
*/
static inline void ipv4_to_ipv4_mapped_ipv6(struct in6_addr *in6,
struct in_addr in)
{
uint32_t addr_type = htonl(0xFFFF);
memset(in6, 0, sizeof(struct in6_addr));
memcpy((char *)in6 + 8, &addr_type, sizeof(addr_type));
memcpy((char *)in6 + 12, &in, sizeof(struct in_addr));
}
/*
* convert an ipv4 mapped ipv6 address back to ipv4 address
*/
static inline void ipv4_mapped_ipv6_to_ipv4(const struct in6_addr *in6,
struct in_addr *in)
{
memset(in, 0, sizeof(struct in_addr));
memcpy(in, (char *)in6 + 12, sizeof(struct in_addr));
}
/*
* Check if a struct ipaddr has nonzero value
*/
static inline bool ipaddr_isset(struct ipaddr *ip)
{
static struct ipaddr a = {};
return (0 != memcmp(&a, ip, sizeof(struct ipaddr)));
}
/*
* generic ordering comparison between IP addresses
*/
static inline int ipaddr_cmp(const struct ipaddr *a, const struct ipaddr *b)
{
uint32_t va, vb;
va = a->ipa_type;
vb = b->ipa_type;
if (va != vb)
return (va < vb) ? -1 : 1;
switch (a->ipa_type) {
case IPADDR_V4:
va = ntohl(a->ipaddr_v4.s_addr);
vb = ntohl(b->ipaddr_v4.s_addr);
if (va != vb)
return (va < vb) ? -1 : 1;
return 0;
case IPADDR_V6:
return memcmp((void *)&a->ipaddr_v6, (void *)&b->ipaddr_v6,
sizeof(a->ipaddr_v6));
default:
return 0;
}
}
#ifdef _FRR_ATTRIBUTE_PRINTFRR
#pragma FRR printfrr_ext "%pIA" (struct ipaddr *)
#endif
#ifdef __cplusplus
}
#endif
#endif /* __IPADDR_H__ */
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