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/* $OpenBSD: util.c,v 1.4 2022/12/28 21:30:18 jmc Exp $ */
/*
* Copyright (c) 2012 Alexander Bluhm <bluhm@openbsd.org>
* Copyright (c) 2004 Esben Norby <norby@openbsd.org>
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <netinet/in.h>
#include <string.h>
#include "ospf6d.h"
#include "log.h"
#define IN6_IS_SCOPE_EMBED(a) \
((IN6_IS_ADDR_LINKLOCAL(a)) || \
(IN6_IS_ADDR_MC_LINKLOCAL(a)) || \
(IN6_IS_ADDR_MC_INTFACELOCAL(a)))
void
embedscope(struct sockaddr_in6 *sin6)
{
u_int16_t tmp16;
if (IN6_IS_SCOPE_EMBED(&sin6->sin6_addr)) {
bcopy(&sin6->sin6_addr.s6_addr[2], &tmp16, sizeof(tmp16));
if (tmp16 != 0) {
log_warnx("embedscope: address %s already has embedded "
"scope %u", log_sockaddr(sin6), ntohs(tmp16));
}
tmp16 = htons(sin6->sin6_scope_id);
bcopy(&tmp16, &sin6->sin6_addr.s6_addr[2], sizeof(tmp16));
sin6->sin6_scope_id = 0;
}
}
void
recoverscope(struct sockaddr_in6 *sin6)
{
u_int16_t tmp16;
if (sin6->sin6_scope_id != 0) {
log_warnx("recoverscope: address %s already has scope id %u",
log_sockaddr(sin6), sin6->sin6_scope_id);
}
if (IN6_IS_SCOPE_EMBED(&sin6->sin6_addr)) {
bcopy(&sin6->sin6_addr.s6_addr[2], &tmp16, sizeof(tmp16));
sin6->sin6_scope_id = ntohs(tmp16);
sin6->sin6_addr.s6_addr[2] = 0;
sin6->sin6_addr.s6_addr[3] = 0;
}
}
void
addscope(struct sockaddr_in6 *sin6, u_int32_t id)
{
if (sin6->sin6_scope_id != 0) {
log_warnx("addscope: address %s already has scope id %u",
log_sockaddr(sin6), sin6->sin6_scope_id);
}
if (IN6_IS_SCOPE_EMBED(&sin6->sin6_addr)) {
sin6->sin6_scope_id = id;
}
}
void
clearscope(struct in6_addr *in6)
{
if (IN6_IS_SCOPE_EMBED(in6)) {
in6->s6_addr[2] = 0;
in6->s6_addr[3] = 0;
}
}
#undef IN6_IS_SCOPE_EMBED
u_int8_t
mask2prefixlen(struct sockaddr_in6 *sa_in6)
{
u_int8_t *ap, *ep;
u_int l = 0;
/*
* sin6_len is the size of the sockaddr so subtract the offset of
* the possibly truncated sin6_addr struct.
*/
ap = (u_int8_t *)&sa_in6->sin6_addr;
ep = (u_int8_t *)sa_in6 + sa_in6->sin6_len;
for (; ap < ep; ap++) {
/* this "beauty" is adopted from sbin/route/show.c ... */
switch (*ap) {
case 0xff:
l += 8;
break;
case 0xfe:
l += 7;
goto done;
case 0xfc:
l += 6;
goto done;
case 0xf8:
l += 5;
goto done;
case 0xf0:
l += 4;
goto done;
case 0xe0:
l += 3;
goto done;
case 0xc0:
l += 2;
goto done;
case 0x80:
l += 1;
goto done;
case 0x00:
goto done;
default:
fatalx("non contiguous inet6 netmask");
}
}
done:
if (l > sizeof(struct in6_addr) * 8)
fatalx("%s: prefixlen %d out of bound", __func__, l);
return (l);
}
struct in6_addr *
prefixlen2mask(u_int8_t prefixlen)
{
static struct in6_addr mask;
int i;
bzero(&mask, sizeof(mask));
for (i = 0; i < prefixlen / 8; i++)
mask.s6_addr[i] = 0xff;
i = prefixlen % 8;
if (i)
mask.s6_addr[prefixlen / 8] = 0xff00 >> i;
return (&mask);
}
void
inet6applymask(struct in6_addr *dest, const struct in6_addr *src, int prefixlen)
{
struct in6_addr mask;
int i;
bzero(&mask, sizeof(mask));
for (i = 0; i < prefixlen / 8; i++)
mask.s6_addr[i] = 0xff;
i = prefixlen % 8;
if (i)
mask.s6_addr[prefixlen / 8] = 0xff00 >> i;
for (i = 0; i < 16; i++)
dest->s6_addr[i] = src->s6_addr[i] & mask.s6_addr[i];
}
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