/* $KAME: inet6.c,v 1.7 2004/11/17 02:16:23 itojun Exp $ */
/*
* Copyright (C) 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <netdb.h>
#include "defs.h"
int
inet6_uvif2scopeid(struct sockaddr_in6 *sa, struct uvif *v)
{
if (IN6_IS_ADDR_MULTICAST(&sa->sin6_addr)) {
if (IN6_IS_ADDR_MC_LINKLOCAL(&sa->sin6_addr))
return(v->uv_ifindex);
}
else {
if (IN6_IS_ADDR_LINKLOCAL(&sa->sin6_addr))
return(v->uv_ifindex);
}
return(0);
}
int
inet6_localif_address(struct sockaddr_in6 *sa, struct uvif *v)
{
struct phaddr *pa;
for (pa = v->uv_addrs; pa; pa = pa->pa_next)
if (inet6_equal(sa, &pa->pa_addr))
return(TRUE);
return(FALSE);
}
int
inet6_valid_host(struct sockaddr_in6 *addr)
{
if (IN6_IS_ADDR_MULTICAST(&addr->sin6_addr))
return(FALSE);
return(TRUE);
}
int
inet6_equal(struct sockaddr_in6 *sa1, struct sockaddr_in6 *sa2)
{
if (sa1->sin6_scope_id == sa2->sin6_scope_id &&
IN6_ARE_ADDR_EQUAL(&sa1->sin6_addr, &sa2->sin6_addr))
return(1);
return(0);
}
int
inet6_lessthan(struct sockaddr_in6 *sa1, struct sockaddr_in6 *sa2)
{
u_int32_t s32_1, s32_2;
int i;
if (sa1->sin6_scope_id < sa2->sin6_scope_id)
return(1);
if (sa1->sin6_scope_id == sa2->sin6_scope_id) {
for (i = 0; i < 4; i++) {
s32_1 = ntohl(*(u_int32_t *)&sa1->sin6_addr.s6_addr[i * 4]);
s32_2 = ntohl(*(u_int32_t *)&sa2->sin6_addr.s6_addr[i * 4]);
if (s32_1 > s32_2)
return(0);
if (s32_1 < s32_2)
return(1);
/* otherwide, continue to compare */
}
}
return(0);
}
int
inet6_lessoreq(struct sockaddr_in6 *sa1, struct sockaddr_in6 *sa2)
{
u_int32_t s32_1, s32_2;
int i;
if (sa1->sin6_scope_id < sa2->sin6_scope_id)
return(1);
if (sa1->sin6_scope_id == sa2->sin6_scope_id) {
for (i = 0; i < 4; i++) {
s32_1 = ntohl(*(u_int32_t *)&sa1->sin6_addr.s6_addr[i * 4]);
s32_2 = ntohl(*(u_int32_t *)&sa2->sin6_addr.s6_addr[i * 4]);
if (s32_1 > s32_2)
return(0);
if (s32_1 < s32_2)
return(1);
/* otherwide, continue to compare */
}
/* sa1 == sa2 */
return(1);
}
return(0);
}
int
inet6_greaterthan(struct sockaddr_in6 *sa1, struct sockaddr_in6 *sa2)
{
u_int32_t s32_1, s32_2;
int i;
if (sa1->sin6_scope_id > sa2->sin6_scope_id)
return(1);
if (sa1->sin6_scope_id == sa2->sin6_scope_id) {
for (i = 0; i < 4; i++) {
s32_1 = ntohl(*(u_int32_t *)&sa1->sin6_addr.s6_addr[i * 4]);
s32_2 = ntohl(*(u_int32_t *)&sa2->sin6_addr.s6_addr[i * 4]);
if (s32_1 < s32_2)
return(0);
if (s32_1 > s32_2)
return(1);
/* otherwide, continue to compare */
}
}
return(0);
}
int
inet6_greateroreq(struct sockaddr_in6 *sa1, struct sockaddr_in6 *sa2)
{
u_int32_t s32_1, s32_2;
int i;
if (sa1->sin6_scope_id > sa2->sin6_scope_id)
return(1);
if (sa1->sin6_scope_id == sa2->sin6_scope_id) {
for (i = 0; i < 4; i++) {
s32_1 = ntohl(*(u_int32_t *)&sa1->sin6_addr.s6_addr[i * 4]);
s32_2 = ntohl(*(u_int32_t *)&sa2->sin6_addr.s6_addr[i * 4]);
if (s32_1 < s32_2)
return(0);
if (s32_1 > s32_2)
return(1);
/* otherwide, continue to compare */
}
/* sa1 == sa2 */
return(1);
}
return(0);
}
int
inet6_match_prefix(sa1, sa2, mask)
struct sockaddr_in6 *sa1, *sa2;
struct in6_addr *mask;
{
int i;
if (sa1->sin6_scope_id != sa2->sin6_scope_id)
return(0);
for (i = 0; i < 16; i++) {
if ((sa1->sin6_addr.s6_addr[i] ^ sa2->sin6_addr.s6_addr[i]) &
mask->s6_addr[i])
return(0);
}
return(1);
}
char *
inet6_fmt(struct in6_addr *addr)
{
static char ip6buf[8][NI_MAXHOST];
static int ip6round = 0;
struct sockaddr_in6 sin6;
char *cp;
const int niflags = NI_NUMERICHOST;
ip6round = (ip6round + 1) & 7;
cp = ip6buf[ip6round];
memset(&sin6, 0, sizeof(sin6));
#ifdef HAVE_SA_LEN
sin6.sin6_len = sizeof(struct sockaddr_in6);
#endif
sin6.sin6_family = AF_INET6;
sin6.sin6_addr = *addr;
if (IN6_IS_ADDR_LINKLOCAL(addr) || IN6_IS_ADDR_MC_LINKLOCAL(addr)) {
sin6.sin6_scope_id = addr->s6_addr[2] << 8 | addr->s6_addr[3];
sin6.sin6_addr.s6_addr[2] = sin6.sin6_addr.s6_addr[3] = 0;
}
if (getnameinfo((struct sockaddr *)&sin6, sizeof(sin6), cp,
sizeof(ip6buf[ip6round]), NULL, 0, niflags))
return (NULL);
else
return (cp);
}
char *
ifindex2str(int ifindex)
{
static char ifname[IFNAMSIZ];
return(if_indextoname(ifindex, ifname));
}
int
inet6_mask2plen(struct in6_addr *mask)
{
int masklen;
u_char *p = (u_char *)mask;
u_char *lim = p + 16;
for (masklen = 0; p < lim; p++) {
switch (*p) {
case 0xff:
masklen += 8;
break;
case 0xfe:
masklen += 7;
break;
case 0xfc:
masklen += 6;
break;
case 0xf8:
masklen += 5;
break;
case 0xf0:
masklen += 4;
break;
case 0xe0:
masklen += 3;
break;
case 0xc0:
masklen += 2;
break;
case 0x80:
masklen += 1;
break;
case 0x00:
break;
}
}
return(masklen);
}
char *
net6name(struct in6_addr *prefix, struct in6_addr *mask)
{
static char ip6buf[8][NI_MAXHOST + 4]; /* length of addr/plen */
static int ip6round = 0;
char *cp, *ep, *p;
ip6round = (ip6round + 1) & 7;
cp = ip6buf[ip6round];
ep = &ip6buf[ip6round][sizeof(ip6buf[ip6round])];
p = inet6_fmt(prefix);
if (!p)
return NULL;
#ifdef HAVE_STRLCPY
strlcpy(cp, p, sizeof(ip6buf[ip6round]));
#elif HAVE_STRNCPY
strncpy(cp, p, sizeof(ip6buf[ip6round]));
#else
strcpy(cp, p);
#endif
cp += strlen(cp);
snprintf(cp, ep - cp, "/%d", inet6_mask2plen(mask));
return(ip6buf[ip6round]);
}
void
init_sin6(struct sockaddr_in6 *sin6)
{
memset(sin6, 0, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
#ifdef HAVE_SA_LEN
sin6->sin6_len = sizeof(*sin6);
#endif
}
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