468 lines
11 KiB
C
468 lines
11 KiB
C
/* $NetBSD: scope6.c,v 1.11 2014/12/10 01:10:37 christos Exp $ */
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/* $KAME$ */
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/*-
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* Copyright (C) 2000 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: scope6.c,v 1.11 2014/12/10 01:10:37 christos Exp $");
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <sys/queue.h>
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#include <sys/syslog.h>
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#include <net/route.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/scope6_var.h>
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#ifdef ENABLE_DEFAULT_SCOPE
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int ip6_use_defzone = 1;
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#else
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int ip6_use_defzone = 0;
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#endif
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static struct scope6_id sid_default;
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#define SID(ifp) \
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(((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id)
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void
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scope6_init(void)
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{
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memset(&sid_default, 0, sizeof(sid_default));
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}
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struct scope6_id *
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scope6_ifattach(struct ifnet *ifp)
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{
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struct scope6_id *sid;
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sid = (struct scope6_id *)malloc(sizeof(*sid), M_IFADDR, M_WAITOK);
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memset(sid, 0, sizeof(*sid));
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/*
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* XXX: IPV6_ADDR_SCOPE_xxx macros are not standard.
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* Should we rather hardcode here?
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*/
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sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index;
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sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index;
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#ifdef MULTI_SCOPE
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/* by default, we don't care about scope boundary for these scopes. */
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sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1;
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sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1;
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#endif
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return sid;
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}
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void
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scope6_ifdetach(struct scope6_id *sid)
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{
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free(sid, M_IFADDR);
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}
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int
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scope6_set(struct ifnet *ifp, const struct scope6_id *idlist)
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{
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int i;
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int error = 0;
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struct scope6_id *sid = NULL;
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sid = SID(ifp);
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if (!sid) /* paranoid? */
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return (EINVAL);
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/*
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* XXX: We need more consistency checks of the relationship among
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* scopes (e.g. an organization should be larger than a site).
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*/
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/*
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* TODO(XXX): after setting, we should reflect the changes to
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* interface addresses, routing table entries, PCB entries...
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*/
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for (i = 0; i < 16; i++) {
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if (idlist->s6id_list[i] &&
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idlist->s6id_list[i] != sid->s6id_list[i]) {
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/*
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* An interface zone ID must be the corresponding
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* interface index by definition.
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*/
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if (i == IPV6_ADDR_SCOPE_INTFACELOCAL &&
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idlist->s6id_list[i] != ifp->if_index)
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return (EINVAL);
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if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
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!if_byindex(idlist->s6id_list[i])) {
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/*
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* XXX: theoretically, there should be no
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* relationship between link IDs and interface
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* IDs, but we check the consistency for
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* safety in later use.
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*/
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return (EINVAL);
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}
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/*
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* XXX: we must need lots of work in this case,
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* but we simply set the new value in this initial
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* implementation.
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*/
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sid->s6id_list[i] = idlist->s6id_list[i];
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}
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}
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return (error);
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}
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int
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scope6_get(const struct ifnet *ifp, struct scope6_id *idlist)
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{
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/* We only need to lock the interface's afdata for SID() to work. */
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const struct scope6_id *sid = SID(ifp);
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if (sid == NULL) /* paranoid? */
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return EINVAL;
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*idlist = *sid;
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return 0;
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}
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/*
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* Get a scope of the address. Interface-local, link-local, site-local
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* or global.
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*/
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int
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in6_addrscope(const struct in6_addr *addr)
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{
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int scope;
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if (addr->s6_addr[0] == 0xfe) {
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scope = addr->s6_addr[1] & 0xc0;
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switch (scope) {
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case 0x80:
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return IPV6_ADDR_SCOPE_LINKLOCAL;
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case 0xc0:
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return IPV6_ADDR_SCOPE_SITELOCAL;
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default:
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return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
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}
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}
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if (addr->s6_addr[0] == 0xff) {
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scope = addr->s6_addr[1] & 0x0f;
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/*
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* due to other scope such as reserved,
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* return scope doesn't work.
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*/
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switch (scope) {
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case IPV6_ADDR_SCOPE_INTFACELOCAL:
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return IPV6_ADDR_SCOPE_INTFACELOCAL;
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case IPV6_ADDR_SCOPE_LINKLOCAL:
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return IPV6_ADDR_SCOPE_LINKLOCAL;
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case IPV6_ADDR_SCOPE_SITELOCAL:
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return IPV6_ADDR_SCOPE_SITELOCAL;
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default:
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return IPV6_ADDR_SCOPE_GLOBAL;
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}
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}
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if (memcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) {
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if (addr->s6_addr[15] == 1) /* loopback */
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return IPV6_ADDR_SCOPE_LINKLOCAL;
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if (addr->s6_addr[15] == 0) {
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/*
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* Regard the unspecified addresses as global,
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* since it has no ambiguity.
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* XXX: not sure if it's correct...
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*/
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return IPV6_ADDR_SCOPE_GLOBAL;
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}
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}
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return IPV6_ADDR_SCOPE_GLOBAL;
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}
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/* note that ifp argument might be NULL */
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void
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scope6_setdefault(struct ifnet *ifp)
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{
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/*
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* Currently, this function just sets the default "interfaces"
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* and "links" according to the given interface.
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* We might eventually have to separate the notion of "link" from
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* "interface" and provide a user interface to set the default.
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*/
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if (ifp) {
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sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] =
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ifp->if_index;
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sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
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ifp->if_index;
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} else {
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sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0;
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sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
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}
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}
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int
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scope6_get_default(struct scope6_id *idlist)
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{
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*idlist = sid_default;
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return (0);
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}
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uint32_t
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scope6_addr2default(const struct in6_addr *addr)
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{
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uint32_t id;
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/*
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* special case: The loopback address should be considered as
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* link-local, but there's no ambiguity in the syntax.
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*/
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if (IN6_IS_ADDR_LOOPBACK(addr))
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return (0);
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/*
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* XXX: 32-bit read is atomic on all our platforms, is it OK
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* not to lock here?
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*/
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id = sid_default.s6id_list[in6_addrscope(addr)];
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return (id);
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}
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/*
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* Validate the specified scope zone ID in the sin6_scope_id field. If the ID
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* is unspecified (=0), needs to be specified, and the default zone ID can be
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* used, the default value will be used.
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* This routine then generates the kernel-internal form: if the address scope
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* of is interface-local or link-local, embed the interface index in the
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* address.
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*/
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int
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sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok)
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{
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struct ifnet *ifp;
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uint32_t zoneid;
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if ((zoneid = sin6->sin6_scope_id) == 0 && defaultok)
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zoneid = scope6_addr2default(&sin6->sin6_addr);
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if (zoneid != 0 &&
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(IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
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IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr))) {
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/*
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* At this moment, we only check interface-local and
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* link-local scope IDs, and use interface indices as the
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* zone IDs assuming a one-to-one mapping between interfaces
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* and links.
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*/
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ifp = if_byindex(zoneid);
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if (ifp == NULL)
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return (ENXIO);
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/* XXX assignment to 16bit from 32bit variable */
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sin6->sin6_addr.s6_addr16[1] = htons(zoneid & 0xffff);
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sin6->sin6_scope_id = 0;
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}
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return 0;
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}
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struct sockaddr *
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sockaddr_in6_externalize(struct sockaddr *dst, socklen_t socklen,
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const struct sockaddr *src)
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{
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struct sockaddr_in6 *sin6;
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sin6 = satosin6(sockaddr_copy(dst, socklen, src));
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if (sin6 == NULL || sa6_recoverscope(sin6) != 0)
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return NULL;
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return dst;
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}
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/*
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* generate standard sockaddr_in6 from embedded form.
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*/
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int
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sa6_recoverscope(struct sockaddr_in6 *sin6)
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{
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uint32_t zoneid;
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if (sin6->sin6_scope_id != 0) {
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log(LOG_NOTICE,
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"sa6_recoverscope: assumption failure (non 0 ID): %s%%%d\n",
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ip6_sprintf(&sin6->sin6_addr), sin6->sin6_scope_id);
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/* XXX: proceed anyway... */
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}
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if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
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IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr)) {
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/*
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* KAME assumption: link id == interface id
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*/
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zoneid = ntohs(sin6->sin6_addr.s6_addr16[1]);
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if (zoneid) {
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if (!if_byindex(zoneid))
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return (ENXIO);
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sin6->sin6_addr.s6_addr16[1] = 0;
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sin6->sin6_scope_id = zoneid;
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}
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}
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return 0;
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}
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int
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in6_setzoneid(struct in6_addr *in6, uint32_t zoneid)
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{
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if (IN6_IS_SCOPE_EMBEDDABLE(in6))
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in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */
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return 0;
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}
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/*
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* Determine the appropriate scope zone ID for in6 and ifp. If ret_id is
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* non NULL, it is set to the zone ID. If the zone ID needs to be embedded
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* in the in6_addr structure, in6 will be modified.
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*/
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int
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in6_setscope(struct in6_addr *in6, const struct ifnet *ifp, uint32_t *ret_id)
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{
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int scope;
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uint32_t zoneid = 0;
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const struct scope6_id *sid = SID(ifp);
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#ifdef DIAGNOSTIC
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if (sid == NULL) { /* should not happen */
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panic("in6_setscope: scope array is NULL");
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/* NOTREACHED */
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}
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#endif
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/*
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* special case: the loopback address can only belong to a loopback
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* interface.
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*/
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if (IN6_IS_ADDR_LOOPBACK(in6)) {
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if (!(ifp->if_flags & IFF_LOOPBACK))
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return (EINVAL);
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else {
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if (ret_id != NULL)
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*ret_id = 0; /* there's no ambiguity */
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return (0);
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}
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}
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scope = in6_addrscope(in6);
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switch (scope) {
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case IPV6_ADDR_SCOPE_INTFACELOCAL: /* should be interface index */
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zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL];
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break;
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case IPV6_ADDR_SCOPE_LINKLOCAL:
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zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL];
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break;
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case IPV6_ADDR_SCOPE_SITELOCAL:
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zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL];
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break;
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case IPV6_ADDR_SCOPE_ORGLOCAL:
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zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL];
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break;
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default:
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zoneid = 0; /* XXX: treat as global. */
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break;
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}
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if (ret_id != NULL)
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*ret_id = zoneid;
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return in6_setzoneid(in6, zoneid);
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}
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const char *
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in6_getscopename(const struct in6_addr *addr)
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{
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switch (in6_addrscope(addr)) {
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case IPV6_ADDR_SCOPE_INTFACELOCAL: return "interface";
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#if IPV6_ADDR_SCOPE_INTFACELOCAL != IPV6_ADDR_SCOPE_NODELOCAL
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case IPV6_ADDR_SCOPE_NODELOCAL: return "node";
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#endif
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case IPV6_ADDR_SCOPE_LINKLOCAL: return "link";
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case IPV6_ADDR_SCOPE_SITELOCAL: return "site";
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case IPV6_ADDR_SCOPE_ORGLOCAL: return "organization";
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case IPV6_ADDR_SCOPE_GLOBAL: return "global";
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default: return "unknown";
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}
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}
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/*
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* Just clear the embedded scope identifier. Return 0 if the original address
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* is intact; return non 0 if the address is modified.
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*/
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int
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in6_clearscope(struct in6_addr *in6)
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{
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int modified = 0;
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if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) {
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if (in6->s6_addr16[1] != 0)
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modified = 1;
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in6->s6_addr16[1] = 0;
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}
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return (modified);
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}
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