c5d5f7697a
addresses. Make the kernel support SIOC[SG]IFADDRPREF for IPv6 interface addresses. In in6ifa_ifpforlinklocal(), consult preference numbers before making an otherwise arbitrary choice of in6_ifaddr. Otherwise, preference numbers are *not* consulted by the kernel, but that will be rather easy for somebody with a little bit of free time to fix. Please note that setting the preference number for a link-local IPv6 address does not work right, yet, but that ought to be fixed soon. In support of the changes above, 1 Add a method to struct domain for "externalizing" a sockaddr, and provide an implementation for IPv6. Expect more work in this area: it may be more proper to say that the IPv6 implementation "internalizes" a sockaddr. Add sockaddr_externalize(). 2 Add a subroutine, sofamily(), that returns a struct socket's address family or AF_UNSPEC. 3 Make a lot of IPv4-specific code generic, and move it from sys/netinet/ to sys/net/ for re-use by IPv6 parts of the kernel and ifconfig(8).
475 lines
11 KiB
C
475 lines
11 KiB
C
/* $NetBSD: scope6.c,v 1.8 2009/09/11 22:06:29 dyoung Exp $ */
|
|
/* $KAME$ */
|
|
|
|
/*-
|
|
* Copyright (C) 2000 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 <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: scope6.c,v 1.8 2009/09/11 22:06:29 dyoung Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/syslog.h>
|
|
|
|
#include <net/route.h>
|
|
#include <net/if.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <netinet6/in6_var.h>
|
|
#include <netinet6/scope6_var.h>
|
|
|
|
#ifdef ENABLE_DEFAULT_SCOPE
|
|
int ip6_use_defzone = 1;
|
|
#else
|
|
int ip6_use_defzone = 0;
|
|
#endif
|
|
|
|
static struct scope6_id sid_default;
|
|
#define SID(ifp) \
|
|
(((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id)
|
|
|
|
void
|
|
scope6_init(void)
|
|
{
|
|
|
|
memset(&sid_default, 0, sizeof(sid_default));
|
|
}
|
|
|
|
struct scope6_id *
|
|
scope6_ifattach(struct ifnet *ifp)
|
|
{
|
|
struct scope6_id *sid;
|
|
|
|
sid = (struct scope6_id *)malloc(sizeof(*sid), M_IFADDR, M_WAITOK);
|
|
memset(sid, 0, sizeof(*sid));
|
|
|
|
/*
|
|
* XXX: IPV6_ADDR_SCOPE_xxx macros are not standard.
|
|
* Should we rather hardcode here?
|
|
*/
|
|
sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index;
|
|
sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index;
|
|
#ifdef MULTI_SCOPE
|
|
/* by default, we don't care about scope boundary for these scopes. */
|
|
sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1;
|
|
sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1;
|
|
#endif
|
|
|
|
return sid;
|
|
}
|
|
|
|
void
|
|
scope6_ifdetach(struct scope6_id *sid)
|
|
{
|
|
|
|
free(sid, M_IFADDR);
|
|
}
|
|
|
|
int
|
|
scope6_set(struct ifnet *ifp, const struct scope6_id *idlist)
|
|
{
|
|
int i;
|
|
int error = 0;
|
|
struct scope6_id *sid = NULL;
|
|
|
|
sid = SID(ifp);
|
|
|
|
if (!sid) /* paranoid? */
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* XXX: We need more consistency checks of the relationship among
|
|
* scopes (e.g. an organization should be larger than a site).
|
|
*/
|
|
|
|
/*
|
|
* TODO(XXX): after setting, we should reflect the changes to
|
|
* interface addresses, routing table entries, PCB entries...
|
|
*/
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
if (idlist->s6id_list[i] &&
|
|
idlist->s6id_list[i] != sid->s6id_list[i]) {
|
|
/*
|
|
* An interface zone ID must be the corresponding
|
|
* interface index by definition.
|
|
*/
|
|
if (i == IPV6_ADDR_SCOPE_INTFACELOCAL &&
|
|
idlist->s6id_list[i] != ifp->if_index)
|
|
return (EINVAL);
|
|
|
|
if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
|
|
idlist->s6id_list[i] >= if_indexlim) {
|
|
/*
|
|
* XXX: theoretically, there should be no
|
|
* relationship between link IDs and interface
|
|
* IDs, but we check the consistency for
|
|
* safety in later use.
|
|
*/
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* XXX: we must need lots of work in this case,
|
|
* but we simply set the new value in this initial
|
|
* implementation.
|
|
*/
|
|
sid->s6id_list[i] = idlist->s6id_list[i];
|
|
}
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
scope6_get(const struct ifnet *ifp, struct scope6_id *idlist)
|
|
{
|
|
/* We only need to lock the interface's afdata for SID() to work. */
|
|
const struct scope6_id *sid = SID(ifp);
|
|
|
|
if (sid == NULL) /* paranoid? */
|
|
return EINVAL;
|
|
|
|
*idlist = *sid;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get a scope of the address. Interface-local, link-local, site-local
|
|
* or global.
|
|
*/
|
|
int
|
|
in6_addrscope(const struct in6_addr *addr)
|
|
{
|
|
int scope;
|
|
|
|
if (addr->s6_addr[0] == 0xfe) {
|
|
scope = addr->s6_addr[1] & 0xc0;
|
|
|
|
switch (scope) {
|
|
case 0x80:
|
|
return IPV6_ADDR_SCOPE_LINKLOCAL;
|
|
break;
|
|
case 0xc0:
|
|
return IPV6_ADDR_SCOPE_SITELOCAL;
|
|
break;
|
|
default:
|
|
return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
if (addr->s6_addr[0] == 0xff) {
|
|
scope = addr->s6_addr[1] & 0x0f;
|
|
|
|
/*
|
|
* due to other scope such as reserved,
|
|
* return scope doesn't work.
|
|
*/
|
|
switch (scope) {
|
|
case IPV6_ADDR_SCOPE_INTFACELOCAL:
|
|
return IPV6_ADDR_SCOPE_INTFACELOCAL;
|
|
break;
|
|
case IPV6_ADDR_SCOPE_LINKLOCAL:
|
|
return IPV6_ADDR_SCOPE_LINKLOCAL;
|
|
break;
|
|
case IPV6_ADDR_SCOPE_SITELOCAL:
|
|
return IPV6_ADDR_SCOPE_SITELOCAL;
|
|
break;
|
|
default:
|
|
return IPV6_ADDR_SCOPE_GLOBAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (memcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) {
|
|
if (addr->s6_addr[15] == 1) /* loopback */
|
|
return IPV6_ADDR_SCOPE_LINKLOCAL;
|
|
if (addr->s6_addr[15] == 0) {
|
|
/*
|
|
* Regard the unspecified addresses as global,
|
|
* since it has no ambiguity.
|
|
* XXX: not sure if it's correct...
|
|
*/
|
|
return IPV6_ADDR_SCOPE_GLOBAL;
|
|
}
|
|
}
|
|
|
|
return IPV6_ADDR_SCOPE_GLOBAL;
|
|
}
|
|
|
|
/* note that ifp argument might be NULL */
|
|
void
|
|
scope6_setdefault(struct ifnet *ifp)
|
|
{
|
|
|
|
/*
|
|
* Currently, this function just sets the default "interfaces"
|
|
* and "links" according to the given interface.
|
|
* We might eventually have to separate the notion of "link" from
|
|
* "interface" and provide a user interface to set the default.
|
|
*/
|
|
if (ifp) {
|
|
sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] =
|
|
ifp->if_index;
|
|
sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
|
|
ifp->if_index;
|
|
} else {
|
|
sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0;
|
|
sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
|
|
}
|
|
}
|
|
|
|
int
|
|
scope6_get_default(struct scope6_id *idlist)
|
|
{
|
|
|
|
*idlist = sid_default;
|
|
|
|
return (0);
|
|
}
|
|
|
|
uint32_t
|
|
scope6_addr2default(const struct in6_addr *addr)
|
|
{
|
|
uint32_t id;
|
|
|
|
/*
|
|
* special case: The loopback address should be considered as
|
|
* link-local, but there's no ambiguity in the syntax.
|
|
*/
|
|
if (IN6_IS_ADDR_LOOPBACK(addr))
|
|
return (0);
|
|
|
|
/*
|
|
* XXX: 32-bit read is atomic on all our platforms, is it OK
|
|
* not to lock here?
|
|
*/
|
|
id = sid_default.s6id_list[in6_addrscope(addr)];
|
|
|
|
return (id);
|
|
}
|
|
|
|
/*
|
|
* Validate the specified scope zone ID in the sin6_scope_id field. If the ID
|
|
* is unspecified (=0), needs to be specified, and the default zone ID can be
|
|
* used, the default value will be used.
|
|
* This routine then generates the kernel-internal form: if the address scope
|
|
* of is interface-local or link-local, embed the interface index in the
|
|
* address.
|
|
*/
|
|
int
|
|
sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok)
|
|
{
|
|
struct ifnet *ifp;
|
|
uint32_t zoneid;
|
|
|
|
if ((zoneid = sin6->sin6_scope_id) == 0 && defaultok)
|
|
zoneid = scope6_addr2default(&sin6->sin6_addr);
|
|
|
|
if (zoneid != 0 &&
|
|
(IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
|
|
IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr))) {
|
|
/*
|
|
* At this moment, we only check interface-local and
|
|
* link-local scope IDs, and use interface indices as the
|
|
* zone IDs assuming a one-to-one mapping between interfaces
|
|
* and links.
|
|
*/
|
|
if (if_indexlim <= zoneid)
|
|
return (ENXIO);
|
|
#ifdef __FreeBSD__
|
|
ifp = ifnet_byindex(zoneid);
|
|
#else
|
|
ifp = ifindex2ifnet[zoneid];
|
|
#endif
|
|
if (ifp == NULL) /* XXX: this can happen for some OS */
|
|
return (ENXIO);
|
|
|
|
/* XXX assignment to 16bit from 32bit variable */
|
|
sin6->sin6_addr.s6_addr16[1] = htons(zoneid & 0xffff);
|
|
|
|
sin6->sin6_scope_id = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct sockaddr *
|
|
sockaddr_in6_externalize(struct sockaddr *dst, socklen_t socklen,
|
|
const struct sockaddr *src)
|
|
{
|
|
struct sockaddr_in6 *sin6;
|
|
|
|
sin6 = satosin6(sockaddr_copy(dst, socklen, src));
|
|
|
|
if (sin6 == NULL || sa6_recoverscope(sin6) != 0)
|
|
return NULL;
|
|
|
|
return dst;
|
|
}
|
|
|
|
/*
|
|
* generate standard sockaddr_in6 from embedded form.
|
|
*/
|
|
int
|
|
sa6_recoverscope(struct sockaddr_in6 *sin6)
|
|
{
|
|
uint32_t zoneid;
|
|
|
|
if (sin6->sin6_scope_id != 0) {
|
|
log(LOG_NOTICE,
|
|
"sa6_recoverscope: assumption failure (non 0 ID): %s%%%d\n",
|
|
ip6_sprintf(&sin6->sin6_addr), sin6->sin6_scope_id);
|
|
/* XXX: proceed anyway... */
|
|
}
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
|
|
IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr)) {
|
|
/*
|
|
* KAME assumption: link id == interface id
|
|
*/
|
|
zoneid = ntohs(sin6->sin6_addr.s6_addr16[1]);
|
|
if (zoneid) {
|
|
/* sanity check */
|
|
if (/* zoneid < 0 || */ if_indexlim <= zoneid)
|
|
return (ENXIO);
|
|
#ifdef __FreeBSD__
|
|
if (!ifnet_byindex(zoneid))
|
|
#else
|
|
if (!ifindex2ifnet[zoneid])
|
|
#endif
|
|
return (ENXIO);
|
|
sin6->sin6_addr.s6_addr16[1] = 0;
|
|
sin6->sin6_scope_id = zoneid;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
in6_setzoneid(struct in6_addr *in6, uint32_t zoneid)
|
|
{
|
|
if (IN6_IS_SCOPE_EMBEDDABLE(in6))
|
|
in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Determine the appropriate scope zone ID for in6 and ifp. If ret_id is
|
|
* non NULL, it is set to the zone ID. If the zone ID needs to be embedded
|
|
* in the in6_addr structure, in6 will be modified.
|
|
*/
|
|
int
|
|
in6_setscope(struct in6_addr *in6, const struct ifnet *ifp, uint32_t *ret_id)
|
|
{
|
|
int scope;
|
|
uint32_t zoneid = 0;
|
|
const struct scope6_id *sid = SID(ifp);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (sid == NULL) { /* should not happen */
|
|
panic("in6_setscope: scope array is NULL");
|
|
/* NOTREACHED */
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* special case: the loopback address can only belong to a loopback
|
|
* interface.
|
|
*/
|
|
if (IN6_IS_ADDR_LOOPBACK(in6)) {
|
|
if (!(ifp->if_flags & IFF_LOOPBACK))
|
|
return (EINVAL);
|
|
else {
|
|
if (ret_id != NULL)
|
|
*ret_id = 0; /* there's no ambiguity */
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
scope = in6_addrscope(in6);
|
|
|
|
if (!sid->s6id_list)
|
|
return 0;
|
|
|
|
switch (scope) {
|
|
case IPV6_ADDR_SCOPE_INTFACELOCAL: /* should be interface index */
|
|
zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL];
|
|
break;
|
|
|
|
case IPV6_ADDR_SCOPE_LINKLOCAL:
|
|
zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL];
|
|
break;
|
|
|
|
case IPV6_ADDR_SCOPE_SITELOCAL:
|
|
zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL];
|
|
break;
|
|
|
|
case IPV6_ADDR_SCOPE_ORGLOCAL:
|
|
zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL];
|
|
break;
|
|
|
|
default:
|
|
zoneid = 0; /* XXX: treat as global. */
|
|
break;
|
|
}
|
|
|
|
if (ret_id != NULL)
|
|
*ret_id = zoneid;
|
|
|
|
return in6_setzoneid(in6, zoneid);
|
|
}
|
|
|
|
/*
|
|
* Just clear the embedded scope identifier. Return 0 if the original address
|
|
* is intact; return non 0 if the address is modified.
|
|
*/
|
|
int
|
|
in6_clearscope(struct in6_addr *in6)
|
|
{
|
|
int modified = 0;
|
|
|
|
if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) {
|
|
if (in6->s6_addr16[1] != 0)
|
|
modified = 1;
|
|
in6->s6_addr16[1] = 0;
|
|
}
|
|
|
|
return (modified);
|
|
}
|