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/* SPDX-License-Identifier: AGPL-3.0-or-later
* Copyright Red Hat
* Author: David Gibson <david@gibson.dropbear.id.au>
*
* inany.h - Types and helpers for handling addresses which could be
* IPv6 or IPv4 (encoded as IPv4-mapped IPv6 addresses)
*/
#include <assert.h>
/** union inany_addr - Represents either an IPv4 or IPv6 address
* @a6: Address as an IPv6 address, may be IPv4-mapped
* @v4mapped.zero: All zero-bits for an IPv4 address
* @v4mapped.one: All one-bits for an IPv4 address
* @v4mapped.a4: If @a6 is an IPv4 mapped address, the IPv4 address
*
* @v4mapped shouldn't be accessed except via helpers.
*/
union inany_addr {
struct in6_addr a6;
struct {
uint8_t zero[10];
uint8_t one[2];
struct in_addr a4;
} v4mapped;
};
/** inany_v4 - Extract IPv4 address, if present, from IPv[46] address
* @addr: IPv4 or IPv6 address
*
* Return: IPv4 address if @addr is IPv4, NULL otherwise
*/
static inline const struct in_addr *inany_v4(const union inany_addr *addr)
{
if (!IN6_IS_ADDR_V4MAPPED(&addr->a6))
return NULL;
return &addr->v4mapped.a4;
}
/** inany_equals - Compare two IPv[46] addresses
* @a, @b: IPv[46] addresses
*
* Return: true if @a and @b are the same address
*/
static inline bool inany_equals(const union inany_addr *a,
const union inany_addr *b)
{
return IN6_ARE_ADDR_EQUAL(&a->a6, &b->a6);
}
/** inany_from_af - Set IPv[46] address from IPv4 or IPv6 address
* @aa: Pointer to store IPv[46] address
* @af: Address family of @addr
* @addr: struct in_addr (IPv4) or struct in6_addr (IPv6)
*/
static inline void inany_from_af(union inany_addr *aa, int af, const void *addr)
{
if (af == AF_INET6) {
aa->a6 = *((struct in6_addr *)addr);
} else if (af == AF_INET) {
memset(&aa->v4mapped.zero, 0, sizeof(aa->v4mapped.zero));
memset(&aa->v4mapped.one, 0xff, sizeof(aa->v4mapped.one));
aa->v4mapped.a4 = *((struct in_addr *)addr);
} else {
/* Not valid to call with other address families */
assert(0);
}
}
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