670 lines
18 KiB
C
670 lines
18 KiB
C
/* $NetBSD: in6_ifattach.c,v 1.120 2021/05/17 04:07:43 yamaguchi Exp $ */
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/* $KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 jinmei Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 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: in6_ifattach.c,v 1.120 2021/05/17 04:07:43 yamaguchi Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kmem.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <sys/md5.h>
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#include <sys/socketvar.h>
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#include <sys/cprng.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/in6_ifattach.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet6/ip6_mroute.h>
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#include <netinet6/scope6_var.h>
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int ip6_auto_linklocal = 1; /* enable by default */
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#if 0
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static int get_hostid_ifid(struct ifnet *, struct in6_addr *);
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#endif
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static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
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static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
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static int in6_ifattach_loopback(struct ifnet *);
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#define EUI64_GBIT 0x01
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#define EUI64_UBIT 0x02
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#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (/*CONSTCOND*/ 0)
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#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
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#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
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#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
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#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
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#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
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#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
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#if 0
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/*
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* Generate a last-resort interface identifier from hostid.
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* works only for certain architectures (like sparc).
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* also, using hostid itself may constitute a privacy threat, much worse
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* than MAC addresses (hostids are used for software licensing).
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* maybe we should use MD5(hostid) instead.
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*
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* in6 - upper 64bits are preserved
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*/
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static int
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get_hostid_ifid(struct ifnet *ifp, struct in6_addr *in6)
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{
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int off, len;
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static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
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static const uint8_t allone[8] =
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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if (!hostid)
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return -1;
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/* get up to 8 bytes from the hostid field - should we get */
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len = (sizeof(hostid) > 8) ? 8 : sizeof(hostid);
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off = sizeof(*in6) - len;
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memcpy(&in6->s6_addr[off], &hostid, len);
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/* make sure we do not return anything bogus */
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if (memcmp(&in6->s6_addr[8], allzero, sizeof(allzero)))
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return -1;
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if (memcmp(&in6->s6_addr[8], allone, sizeof(allone)))
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return -1;
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/* make sure to set "u" bit to local, and "g" bit to individual. */
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in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
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in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
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/* convert EUI64 into IPv6 interface identifier */
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EUI64_TO_IFID(in6);
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return 0;
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}
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#endif
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/*
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* Generate a last-resort interface identifier, when the machine has no
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* IEEE802/EUI64 address sources.
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* The goal here is to get an interface identifier that is
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* (1) random enough and (2) does not change across reboot.
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* We currently use MD5(hostname) for it.
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*/
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static int
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get_rand_ifid(struct in6_addr *in6) /* upper 64bits are preserved */
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{
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MD5_CTX ctxt;
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u_int8_t digest[16];
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#if 0
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/* we need at least several letters as seed for ifid */
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if (hostnamelen < 3)
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return -1;
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#endif
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/* generate 8 bytes of pseudo-random value. */
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memset(&ctxt, 0, sizeof(ctxt));
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MD5Init(&ctxt);
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MD5Update(&ctxt, (u_char *)hostname, hostnamelen);
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MD5Final(digest, &ctxt);
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/* assumes sizeof(digest) > sizeof(ifid) */
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memcpy(&in6->s6_addr[8], digest, 8);
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/* make sure to set "u" bit to local, and "g" bit to individual. */
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in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
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in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
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/* convert EUI64 into IPv6 interface identifier */
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EUI64_TO_IFID(in6);
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return 0;
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}
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/*
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* Get interface identifier for the specified interface.
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*
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* in6 - upper 64bits are preserved
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*/
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int
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in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
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{
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struct ifaddr *ifa;
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const struct sockaddr_dl *sdl = NULL;
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const char *addr = NULL; /* XXX gcc 4.8 -Werror=maybe-uninitialized */
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size_t addrlen = 0; /* XXX gcc 4.8 -Werror=maybe-uninitialized */
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static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
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static u_int8_t allone[8] =
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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int s;
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s = pserialize_read_enter();
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IFADDR_READER_FOREACH(ifa, ifp) {
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const struct sockaddr_dl *tsdl;
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if (ifa->ifa_addr->sa_family != AF_LINK)
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continue;
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tsdl = satocsdl(ifa->ifa_addr);
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if (tsdl == NULL || tsdl->sdl_alen == 0)
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continue;
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if (sdl == NULL || ifa == ifp->if_dl || ifa == ifp->if_hwdl) {
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sdl = tsdl;
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addr = CLLADDR(sdl);
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addrlen = sdl->sdl_alen;
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}
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if (ifa == ifp->if_hwdl)
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break;
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}
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pserialize_read_exit(s);
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if (sdl == NULL)
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return -1;
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switch (ifp->if_type) {
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case IFT_IEEE1394:
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case IFT_IEEE80211:
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/* IEEE1394 uses 16byte length address starting with EUI64 */
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if (addrlen > 8)
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addrlen = 8;
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break;
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default:
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break;
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}
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/* get EUI64 */
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switch (ifp->if_type) {
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/* IEEE802/EUI64 cases - what others? */
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case IFT_ETHER:
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case IFT_ATM:
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case IFT_IEEE1394:
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case IFT_IEEE80211:
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/* look at IEEE802/EUI64 only */
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if (addrlen != 8 && addrlen != 6)
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return -1;
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/*
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* check for invalid MAC address - on bsdi, we see it a lot
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* since wildboar configures all-zero MAC on pccard before
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* card insertion.
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*/
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if (memcmp(addr, allzero, addrlen) == 0)
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return -1;
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if (memcmp(addr, allone, addrlen) == 0)
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return -1;
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/* make EUI64 address */
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if (addrlen == 8)
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memcpy(&in6->s6_addr[8], addr, 8);
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else if (addrlen == 6) {
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in6->s6_addr[8] = addr[0];
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in6->s6_addr[9] = addr[1];
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in6->s6_addr[10] = addr[2];
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in6->s6_addr[11] = 0xff;
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in6->s6_addr[12] = 0xfe;
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in6->s6_addr[13] = addr[3];
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in6->s6_addr[14] = addr[4];
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in6->s6_addr[15] = addr[5];
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}
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break;
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case IFT_ARCNET:
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if (addrlen != 1)
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return -1;
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if (!addr[0])
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return -1;
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memset(&in6->s6_addr[8], 0, 8);
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in6->s6_addr[15] = addr[0];
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/*
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* due to insufficient bitwidth, we mark it local.
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*/
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in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
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in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
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break;
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case IFT_GIF:
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#ifdef IFT_STF
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case IFT_STF:
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#endif
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/*
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* RFC2893 says: "SHOULD use IPv4 address as ifid source".
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* however, IPv4 address is not very suitable as unique
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* identifier source (can be renumbered).
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* we don't do this.
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*/
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return -1;
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default:
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return -1;
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}
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/* sanity check: g bit must not indicate "group" */
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if (EUI64_GROUP(in6))
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return -1;
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/* convert EUI64 into IPv6 interface identifier */
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EUI64_TO_IFID(in6);
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/*
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* sanity check: ifid must not be all zero, avoid conflict with
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* subnet router anycast
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*/
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if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
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memcmp(&in6->s6_addr[9], allzero, 7) == 0) {
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return -1;
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}
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return 0;
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}
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/*
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* Get interface identifier for the specified interface. If it is not
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* available on ifp0, borrow interface identifier from other information
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* sources.
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*
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* altifp - secondary EUI64 source
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*/
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static int
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get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
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struct in6_addr *in6)
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{
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struct ifnet *ifp;
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int s;
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/* first, try to get it from the interface itself */
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if (in6_get_hw_ifid(ifp0, in6) == 0) {
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nd6log(LOG_DEBUG, "%s: got interface identifier from itself\n",
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if_name(ifp0));
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goto success;
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}
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/* try secondary EUI64 source. this basically is for ATM PVC */
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if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
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nd6log(LOG_DEBUG, "%s: got interface identifier from %s\n",
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if_name(ifp0), if_name(altifp));
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goto success;
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}
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/* next, try to get it from some other hardware interface */
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s = pserialize_read_enter();
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IFNET_READER_FOREACH(ifp) {
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if (ifp == ifp0)
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continue;
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if (in6_get_hw_ifid(ifp, in6) != 0)
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continue;
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/*
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* to borrow ifid from other interface, ifid needs to be
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* globally unique
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*/
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if (IFID_UNIVERSAL(in6)) {
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nd6log(LOG_DEBUG,
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"%s: borrow interface identifier from %s\n",
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if_name(ifp0), if_name(ifp));
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pserialize_read_exit(s);
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goto success;
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}
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}
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pserialize_read_exit(s);
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#if 0
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/* get from hostid - only for certain architectures */
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if (get_hostid_ifid(ifp, in6) == 0) {
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nd6log(LOG_DEBUG,
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"%s: interface identifier generated by hostid\n",
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if_name(ifp0));
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goto success;
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}
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#endif
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/* last resort: get from random number source */
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if (get_rand_ifid(in6) == 0) {
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nd6log(LOG_DEBUG,
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"%s: interface identifier generated by random number\n",
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if_name(ifp0));
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goto success;
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}
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printf("%s: failed to get interface identifier\n", if_name(ifp0));
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return -1;
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success:
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nd6log(LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
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if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
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in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
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in6->s6_addr[14], in6->s6_addr[15]);
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return 0;
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}
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/*
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* altifp - secondary EUI64 source
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*/
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static int
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in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
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{
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struct in6_aliasreq ifra;
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int error;
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/*
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* configure link-local address.
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*/
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memset(&ifra, 0, sizeof(ifra));
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/*
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* in6_update_ifa() does not use ifra_name, but we accurately set it
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* for safety.
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*/
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strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
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ifra.ifra_addr.sin6_family = AF_INET6;
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ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
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ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
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ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
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if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
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ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
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ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
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} else {
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if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
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nd6log(LOG_ERR,
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"%s: no ifid available\n", if_name(ifp));
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return -1;
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}
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}
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if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
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return -1;
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sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask64, 0, 0, 0);
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/* link-local addresses should NEVER expire. */
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ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
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ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
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/*
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* Now call in6_update_ifa() to do a bunch of procedures to configure
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* a link-local address. We can set the 3rd argument to NULL, because
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* we know there's no other link-local address on the interface
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* and therefore we are adding one (instead of updating one).
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*/
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if ((error = in6_update_ifa(ifp, &ifra, IN6_IFAUPDATE_DADDELAY)) != 0) {
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/*
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* XXX: When the interface does not support IPv6, this call
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* would fail in the SIOCINITIFADDR ioctl. I believe the
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* notification is rather confusing in this case, so just
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* suppress it. (jinmei@kame.net 20010130)
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*/
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if (error != EAFNOSUPPORT)
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nd6log(LOG_NOTICE,
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"failed to configure a link-local address on %s "
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"(errno=%d)\n",
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if_name(ifp), error);
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return -1;
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}
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return 0;
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}
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/*
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* ifp - mut be IFT_LOOP
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*/
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static int
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in6_ifattach_loopback(struct ifnet *ifp)
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{
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struct in6_aliasreq ifra;
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int error;
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memset(&ifra, 0, sizeof(ifra));
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/*
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* in6_update_ifa() does not use ifra_name, but we accurately set it
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* for safety.
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*/
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strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
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sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask128, 0, 0, 0);
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/*
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* Always initialize ia_dstaddr (= broadcast address) to loopback
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* address. Follows IPv4 practice - see in_ifinit().
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*/
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sockaddr_in6_init(&ifra.ifra_dstaddr, &in6addr_loopback, 0, 0, 0);
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sockaddr_in6_init(&ifra.ifra_addr, &in6addr_loopback, 0, 0, 0);
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/* the loopback address should NEVER expire. */
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ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
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ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
|
|
|
|
/* we don't need to perform DAD on loopback interfaces. */
|
|
ifra.ifra_flags |= IN6_IFF_NODAD;
|
|
|
|
/*
|
|
* We are sure that this is a newly assigned address, so we can set
|
|
* NULL to the 3rd arg.
|
|
*/
|
|
if ((error = in6_update_ifa(ifp, &ifra, 0)) != 0) {
|
|
nd6log(LOG_ERR, "failed to configure "
|
|
"the loopback address on %s (errno=%d)\n",
|
|
if_name(ifp), error);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* compute NI group address, based on the current hostname setting.
|
|
* see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
|
|
*
|
|
* when ifp == NULL, the caller is responsible for filling scopeid.
|
|
*/
|
|
int
|
|
in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
|
|
struct sockaddr_in6 *sa6)
|
|
{
|
|
const char *p;
|
|
u_int8_t *q;
|
|
MD5_CTX ctxt;
|
|
u_int8_t digest[16];
|
|
u_int8_t l;
|
|
u_int8_t n[64]; /* a single label must not exceed 63 chars */
|
|
|
|
if (!namelen || !name)
|
|
return -1;
|
|
|
|
p = name;
|
|
while (p && *p && *p != '.' && p - name < namelen)
|
|
p++;
|
|
if (p - name > sizeof(n) - 1)
|
|
return -1; /* label too long */
|
|
l = p - name;
|
|
strncpy((char *)n, name, l);
|
|
n[(int)l] = '\0';
|
|
for (q = n; *q; q++) {
|
|
if ('A' <= *q && *q <= 'Z')
|
|
*q = *q - 'A' + 'a';
|
|
}
|
|
|
|
/* generate 8 bytes of pseudo-random value. */
|
|
memset(&ctxt, 0, sizeof(ctxt));
|
|
MD5Init(&ctxt);
|
|
MD5Update(&ctxt, &l, sizeof(l));
|
|
MD5Update(&ctxt, n, l);
|
|
MD5Final(digest, &ctxt);
|
|
|
|
memset(sa6, 0, sizeof(*sa6));
|
|
sa6->sin6_family = AF_INET6;
|
|
sa6->sin6_len = sizeof(*sa6);
|
|
sa6->sin6_addr.s6_addr16[0] = htons(0xff02);
|
|
sa6->sin6_addr.s6_addr8[11] = 2;
|
|
memcpy(&sa6->sin6_addr.s6_addr32[3], digest,
|
|
sizeof(sa6->sin6_addr.s6_addr32[3]));
|
|
if (in6_setscope(&sa6->sin6_addr, ifp, NULL))
|
|
return -1; /* XXX: should not fail */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* XXX multiple loopback interface needs more care. for instance,
|
|
* nodelocal address needs to be configured onto only one of them.
|
|
* XXX multiple link-local address case
|
|
*
|
|
* altifp - secondary EUI64 source
|
|
*/
|
|
void
|
|
in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
|
|
{
|
|
struct in6_ifaddr *ia;
|
|
struct in6_addr in6;
|
|
|
|
KASSERT(IFNET_LOCKED(ifp));
|
|
|
|
/* some of the interfaces are inherently not IPv6 capable */
|
|
switch (ifp->if_type) {
|
|
case IFT_BRIDGE:
|
|
case IFT_L2TP:
|
|
case IFT_IEEE8023ADLAG:
|
|
#ifdef IFT_PFLOG
|
|
case IFT_PFLOG:
|
|
#endif
|
|
#ifdef IFT_PFSYNC
|
|
case IFT_PFSYNC:
|
|
#endif
|
|
ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL;
|
|
ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* if link mtu is too small, don't try to configure IPv6.
|
|
* remember there could be some link-layer that has special
|
|
* fragmentation logic.
|
|
*/
|
|
if (ifp->if_mtu < IPV6_MMTU) {
|
|
nd6log(LOG_INFO, "%s has too small MTU, IPv6 not enabled\n",
|
|
if_name(ifp));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* quirks based on interface type
|
|
*/
|
|
switch (ifp->if_type) {
|
|
#ifdef IFT_STF
|
|
case IFT_STF:
|
|
/*
|
|
* 6to4 interface is a very special kind of beast.
|
|
* no multicast, no linklocal. RFC2529 specifies how to make
|
|
* linklocals for 6to4 interface, but there's no use and
|
|
* it is rather harmful to have one.
|
|
*/
|
|
ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL;
|
|
return;
|
|
#endif
|
|
case IFT_CARP:
|
|
return;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* usually, we require multicast capability to the interface
|
|
*/
|
|
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
|
|
nd6log(LOG_INFO,
|
|
"%s is not multicast capable, IPv6 not enabled\n",
|
|
if_name(ifp));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* assign loopback address for loopback interface.
|
|
* XXX multiple loopback interface case.
|
|
*/
|
|
if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
|
|
in6 = in6addr_loopback;
|
|
/* These are safe and atomic thanks to IFNET_LOCK */
|
|
if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
|
|
if (in6_ifattach_loopback(ifp) != 0)
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* assign a link-local address, if there's none.
|
|
*/
|
|
if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
|
|
ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) {
|
|
int bound = curlwp_bind();
|
|
struct psref psref;
|
|
ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref);
|
|
if (ia == NULL && in6_ifattach_linklocal(ifp, altifp) != 0) {
|
|
printf("%s: cannot assign link-local address\n",
|
|
ifp->if_xname);
|
|
}
|
|
ia6_release(ia, &psref);
|
|
curlwp_bindx(bound);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* NOTE: in6_ifdetach() does not support loopback if at this moment.
|
|
* We don't need this function in bsdi, because interfaces are never removed
|
|
* from the ifnet list in bsdi.
|
|
*/
|
|
void
|
|
in6_ifdetach(struct ifnet *ifp)
|
|
{
|
|
|
|
/* nuke any of IPv6 addresses we have */
|
|
if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr);
|
|
|
|
in6_purge_multi(ifp);
|
|
|
|
/* remove ip6_mrouter stuff */
|
|
ip6_mrouter_detach(ifp);
|
|
|
|
/* remove neighbor management table */
|
|
nd6_purge(ifp, NULL);
|
|
}
|