508 lines
13 KiB
C
508 lines
13 KiB
C
/*
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* Copyright (c) 2009-2013 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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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/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 <sys/mcache.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 LCK_MTX_DECLARE_ATTR(scope6_lock, &ip6_mutex_grp, &ip6_mutex_attr);
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static struct scope6_id sid_default;
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#define SID(ifp) &IN6_IFEXTRA(ifp)->scope6_id
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SYSCTL_DECL(_net_inet6_ip6);
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int in6_embedded_scope = 1;
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SYSCTL_INT(_net_inet6_ip6, OID_AUTO,
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in6_embedded_scope, CTLFLAG_RW | CTLFLAG_LOCKED, &in6_embedded_scope, 0, "");
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int in6_embedded_scope_debug = 0;
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SYSCTL_INT(_net_inet6_ip6, OID_AUTO,
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in6_embedded_scope_debug, CTLFLAG_RW | CTLFLAG_LOCKED, &in6_embedded_scope_debug, 0, "");
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void
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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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VERIFY(IN6_IFEXTRA(ifp) != NULL);
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if_inet6data_lock_exclusive(ifp);
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sid = SID(ifp);
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/* N.B.: the structure is already zero'ed */
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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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#if 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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if_inet6data_lock_done(ifp);
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}
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/*
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* Get a scope of the address. Node-local, link-local, site-local or global.
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*/
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int
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in6_addrscope(struct in6_addr *addr)
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{
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int scope;
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if (addr->s6_addr8[0] == 0xfe) {
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scope = addr->s6_addr8[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_addr8[0] == 0xff) {
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scope = addr->s6_addr8[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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/*
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* Regard loopback and unspecified addresses as global, since
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* they have no ambiguity.
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*/
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if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) {
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if (addr->s6_addr8[15] == 1) { /* loopback */
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return IPV6_ADDR_SCOPE_LINKLOCAL;
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}
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if (addr->s6_addr8[15] == 0) { /* unspecified */
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return IPV6_ADDR_SCOPE_GLOBAL; /* XXX: correct? */
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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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int
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in6_addr2scopeid(struct ifnet *ifp, struct in6_addr *addr)
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{
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int scope = in6_addrscope(addr);
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int retid = 0;
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struct scope6_id *sid;
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if_inet6data_lock_shared(ifp);
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if (IN6_IFEXTRA(ifp) == NULL) {
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goto err;
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}
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sid = SID(ifp);
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switch (scope) {
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case IPV6_ADDR_SCOPE_NODELOCAL:
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retid = 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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retid = 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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retid = 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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retid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL];
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break;
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default:
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break; /* XXX: value 0, treat as global. */
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}
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err:
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if_inet6data_lock_done(ifp);
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return retid;
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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, uint32_t *ret_ifscope)
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{
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struct ifnet *ifp;
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u_int32_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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}
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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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if (!IF_INDEX_IN_RANGE(zoneid)) {
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return ENXIO;
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}
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ifnet_head_lock_shared();
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ifp = ifindex2ifnet[zoneid];
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if (ifp == NULL) { /* XXX: this can happen for some OS */
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ifnet_head_done();
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return ENXIO;
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}
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ifnet_head_done();
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/* XXX assignment to 16bit from 32bit variable */
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if (in6_embedded_scope) {
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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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if (ret_ifscope != NULL) {
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*ret_ifscope = zoneid;
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}
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}
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return 0;
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}
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void
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rtkey_to_sa6(struct rtentry *rt, struct sockaddr_in6 *sin6)
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{
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VERIFY(rt_key(rt)->sa_family == AF_INET6);
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*sin6 = *((struct sockaddr_in6 *)(void *)rt_key(rt));
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if (in6_embedded_scope) {
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sin6->sin6_scope_id = 0;
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}
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}
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void
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rtgw_to_sa6(struct rtentry *rt, struct sockaddr_in6 *sin6)
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{
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VERIFY(rt->rt_flags & RTF_GATEWAY);
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*sin6 = *((struct sockaddr_in6 *)(void *)rt->rt_gateway);
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sin6->sin6_scope_id = 0;
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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, boolean_t attachcheck)
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{
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if (!in6_embedded_scope) {
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return 0;
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}
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u_int32_t zoneid;
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if (in6_embedded_scope && 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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/* sanity check */
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if (!IF_INDEX_IN_RANGE(zoneid)) {
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return ENXIO;
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}
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/*
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* We use the attachcheck parameter to skip the
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* interface attachment check.
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* Some callers might hold the ifnet_head lock in
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* exclusive mode. This means that:
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* 1) the interface can't go away -- hence we don't
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* need to perform this check
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* 2) we can't perform this check because the lock is
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* in exclusive mode and trying to lock it in shared
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* mode would cause a deadlock.
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*/
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if (attachcheck) {
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ifnet_head_lock_shared();
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if (ifindex2ifnet[zoneid] == NULL) {
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ifnet_head_done();
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return ENXIO;
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}
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ifnet_head_done();
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}
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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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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 set the default "link" according to
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* 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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lck_mtx_lock(&scope6_lock);
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if (ifp != NULL) {
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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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lck_mtx_unlock(&scope6_lock);
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}
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u_int32_t
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scope6_addr2default(struct in6_addr *addr)
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{
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u_int32_t id = 0;
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int index = in6_addrscope(addr);
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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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lck_mtx_lock(&scope6_lock);
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id = sid_default.s6id_list[index];
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lck_mtx_unlock(&scope6_lock);
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return id;
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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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* ret_id - unnecessary?
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*/
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int
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in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id)
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{
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int scope;
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u_int32_t zoneid = 0;
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struct scope6_id *sid;
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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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}
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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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if_inet6data_lock_shared(ifp);
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if (IN6_IFEXTRA(ifp) == NULL) {
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if_inet6data_lock_done(ifp);
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if (ret_id) {
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*ret_id = 0;
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}
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return EINVAL;
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}
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sid = SID(ifp);
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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_inet6data_lock_done(ifp);
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if (ret_id != NULL) {
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*ret_id = zoneid;
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}
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if (in6_embedded_scope && (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6))) {
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in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */
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}
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return 0;
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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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if (!in6_embedded_scope) {
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return 0;
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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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}
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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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bool
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in6_are_addr_equal_scoped(const struct in6_addr *addr_a, const struct in6_addr *addr_b, uint32_t ifscope_a, uint32_t ifscope_b)
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{
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if (!IN6_ARE_ADDR_EQUAL(addr_a, addr_b)) {
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return false;
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} else if (IN6_IS_SCOPE_EMBED(addr_a) && !in6_embedded_scope) {
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return ifscope_a == ifscope_b;
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}
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return true;
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}
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bool
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in6_are_masked_addr_scope_equal(const struct in6_addr *addr_a, uint32_t ifscope_a, const struct in6_addr *addr_b, uint32_t ifscope_b, const struct in6_addr *m)
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{
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if (!IN6_ARE_MASKED_ADDR_EQUAL(addr_a, addr_b, m)) {
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return false;
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} else if (IN6_IS_SCOPE_EMBED(addr_a) && !in6_embedded_scope) {
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return ifscope_a == ifscope_b;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void
|
|
in6_verify_ifscope(const struct in6_addr *in6, uint32_t ifscope)
|
|
{
|
|
if (!in6_embedded_scope || !in6_embedded_scope_debug) {
|
|
return;
|
|
}
|
|
|
|
if (IN6_IS_SCOPE_EMBED(in6)) {
|
|
VERIFY(ntohs(in6->s6_addr16[1]) == ifscope);
|
|
}
|
|
}
|