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/* $OpenBSD: util.c,v 1.4 2016/01/15 12:41:09 renato Exp $ */
/*
* Copyright (c) 2015 Renato Westphal <renato@openbsd.org>
* 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 "eigrpd.h"
#include "log.h"
uint8_t
mask2prefixlen(in_addr_t ina)
{
if (ina == 0)
return (0);
else
return (33 - ffs(ntohl(ina)));
}
uint8_t
mask2prefixlen6(struct sockaddr_in6 *sa_in6)
{
uint8_t l = 0, *ap, *ep;
/*
* sin6_len is the size of the sockaddr so substract the offset of
* the possibly truncated sin6_addr struct.
*/
ap = (uint8_t *)&sa_in6->sin6_addr;
ep = (uint8_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;
return (l);
case 0xfc:
l += 6;
return (l);
case 0xf8:
l += 5;
return (l);
case 0xf0:
l += 4;
return (l);
case 0xe0:
l += 3;
return (l);
case 0xc0:
l += 2;
return (l);
case 0x80:
l += 1;
return (l);
case 0x00:
return (l);
default:
fatalx("non contiguous inet6 netmask");
}
}
return (l);
}
in_addr_t
prefixlen2mask(uint8_t prefixlen)
{
if (prefixlen == 0)
return (0);
return (htonl(0xffffffff << (32 - prefixlen)));
}
struct in6_addr *
prefixlen2mask6(uint8_t prefixlen)
{
static struct in6_addr mask;
int i;
memset(&mask, 0, 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
eigrp_applymask(int af, union eigrpd_addr *dest, const union eigrpd_addr *src,
int prefixlen)
{
struct in6_addr mask;
int i;
switch (af) {
case AF_INET:
dest->v4.s_addr = src->v4.s_addr & prefixlen2mask(prefixlen);
break;
case AF_INET6:
memset(&mask, 0, 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->v6.s6_addr[i] = src->v6.s6_addr[i] &
mask.s6_addr[i];
break;
default:
fatalx("eigrp_applymask: unknown af");
}
}
int
eigrp_addrcmp(int af, const union eigrpd_addr *a, const union eigrpd_addr *b)
{
switch (af) {
case AF_INET:
if (a->v4.s_addr != b->v4.s_addr)
return (1);
break;
case AF_INET6:
if (!IN6_ARE_ADDR_EQUAL(&a->v6, &b->v6))
return (1);
break;
default:
fatalx("eigrp_addrcmp: unknown af");
}
return (0);
}
int
eigrp_addrisset(int af, const union eigrpd_addr *addr)
{
switch (af) {
case AF_UNSPEC:
return (0);
case AF_INET:
if (addr->v4.s_addr != INADDR_ANY)
return (1);
break;
case AF_INET6:
if (!IN6_IS_ADDR_UNSPECIFIED(&addr->v6))
return (1);
break;
default:
fatalx("eigrp_addrisset: unknown af");
}
return (0);
}
int
eigrp_prefixcmp(int af, const union eigrpd_addr *a, const union eigrpd_addr *b,
uint8_t prefixlen)
{
in_addr_t mask, aa, ba;
int i;
uint8_t m;
switch (af) {
case AF_INET:
if (prefixlen == 0)
return (0);
if (prefixlen > 32)
fatalx("eigrp_prefixcmp: bad IPv4 prefixlen");
mask = htonl(prefixlen2mask(prefixlen));
aa = htonl(a->v4.s_addr) & mask;
ba = htonl(b->v4.s_addr) & mask;
return (aa - ba);
case AF_INET6:
if (prefixlen == 0)
return (0);
if (prefixlen > 128)
fatalx("eigrp_prefixcmp: bad IPv6 prefixlen");
for (i = 0; i < prefixlen / 8; i++)
if (a->v6.s6_addr[i] != b->v6.s6_addr[i])
return (a->v6.s6_addr[i] - b->v6.s6_addr[i]);
i = prefixlen % 8;
if (i) {
m = 0xff00 >> i;
if ((a->v6.s6_addr[prefixlen / 8] & m) !=
(b->v6.s6_addr[prefixlen / 8] & m))
return ((a->v6.s6_addr[prefixlen / 8] & m) -
(b->v6.s6_addr[prefixlen / 8] & m));
}
return (0);
default:
fatalx("eigrp_prefixcmp: unknown af");
}
return (-1);
}
#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)
{
uint16_t tmp16;
if (IN6_IS_SCOPE_EMBED(&sin6->sin6_addr)) {
memcpy(&tmp16, &sin6->sin6_addr.s6_addr[2], sizeof(tmp16));
if (tmp16 != 0) {
log_warnx("%s: address %s already has embeded scope %u",
__func__, log_sockaddr(sin6), ntohs(tmp16));
}
tmp16 = htons(sin6->sin6_scope_id);
memcpy(&sin6->sin6_addr.s6_addr[2], &tmp16, sizeof(tmp16));
sin6->sin6_scope_id = 0;
}
}
void
recoverscope(struct sockaddr_in6 *sin6)
{
uint16_t tmp16;
if (sin6->sin6_scope_id != 0) {
log_warnx("%s: address %s already has scope id %u",
__func__, log_sockaddr(sin6), sin6->sin6_scope_id);
}
if (IN6_IS_SCOPE_EMBED(&sin6->sin6_addr)) {
memcpy(&tmp16, &sin6->sin6_addr.s6_addr[2], 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, uint32_t id)
{
if (sin6->sin6_scope_id != 0) {
log_warnx("%s: address %s already has scope id %u", __func__,
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
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