1011 lines
26 KiB
C
1011 lines
26 KiB
C
/* $NetBSD: in6_ifattach.c,v 1.65 2006/05/18 09:05:51 liamjfoy Exp $ */
|
|
/* $KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 jinmei Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: in6_ifattach.c,v 1.65 2006/05/18 09:05:51 liamjfoy Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/md5.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_dl.h>
|
|
#include <net/if_types.h>
|
|
#include <net/route.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_var.h>
|
|
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/in6_ifattach.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#include <netinet6/nd6.h>
|
|
#include <netinet6/ip6_mroute.h>
|
|
#include <netinet6/scope6_var.h>
|
|
|
|
#include <net/net_osdep.h>
|
|
|
|
unsigned long in6_maxmtu = 0;
|
|
|
|
int ip6_auto_linklocal = 1; /* enable by default */
|
|
|
|
struct callout in6_tmpaddrtimer_ch = CALLOUT_INITIALIZER;
|
|
|
|
|
|
#if 0
|
|
static int get_hostid_ifid __P((struct ifnet *, struct in6_addr *));
|
|
#endif
|
|
static int get_rand_ifid __P((struct ifnet *, struct in6_addr *));
|
|
static int generate_tmp_ifid __P((u_int8_t *, const u_int8_t *, u_int8_t *));
|
|
static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *));
|
|
static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *));
|
|
static int in6_ifattach_loopback __P((struct ifnet *));
|
|
|
|
#define EUI64_GBIT 0x01
|
|
#define EUI64_UBIT 0x02
|
|
#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (/*CONSTCOND*/ 0)
|
|
#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
|
|
#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
|
|
#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
|
|
#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
|
|
|
|
#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
|
|
#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
|
|
|
|
#define GEN_TEMPID_RETRY_MAX 5
|
|
|
|
#if 0
|
|
/*
|
|
* Generate a last-resort interface identifier from hostid.
|
|
* works only for certain architectures (like sparc).
|
|
* also, using hostid itself may constitute a privacy threat, much worse
|
|
* than MAC addresses (hostids are used for software licensing).
|
|
* maybe we should use MD5(hostid) instead.
|
|
*/
|
|
static int
|
|
get_hostid_ifid(ifp, in6)
|
|
struct ifnet *ifp;
|
|
struct in6_addr *in6; /* upper 64bits are preserved */
|
|
{
|
|
int off, len;
|
|
static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
|
|
static const uint8_t allone[8] =
|
|
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
|
|
|
|
if (!hostid)
|
|
return -1;
|
|
|
|
/* get up to 8 bytes from the hostid field - should we get */
|
|
len = (sizeof(hostid) > 8) ? 8 : sizeof(hostid);
|
|
off = sizeof(*in6) - len;
|
|
memcpy(&in6->s6_addr[off], &hostid, len);
|
|
|
|
/* make sure we do not return anything bogus */
|
|
if (memcmp(&in6->s6_addr[8], allzero, sizeof(allzero)))
|
|
return -1;
|
|
if (memcmp(&in6->s6_addr[8], allone, sizeof(allone)))
|
|
return -1;
|
|
|
|
/* make sure to set "u" bit to local, and "g" bit to individual. */
|
|
in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
|
|
in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
|
|
|
|
/* convert EUI64 into IPv6 interface identifier */
|
|
EUI64_TO_IFID(in6);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Generate a last-resort interface identifier, when the machine has no
|
|
* IEEE802/EUI64 address sources.
|
|
* The goal here is to get an interface identifier that is
|
|
* (1) random enough and (2) does not change across reboot.
|
|
* We currently use MD5(hostname) for it.
|
|
*/
|
|
static int
|
|
get_rand_ifid(ifp, in6)
|
|
struct ifnet *ifp;
|
|
struct in6_addr *in6; /* upper 64bits are preserved */
|
|
{
|
|
MD5_CTX ctxt;
|
|
u_int8_t digest[16];
|
|
|
|
#if 0
|
|
/* we need at least several letters as seed for ifid */
|
|
if (hostnamelen < 3)
|
|
return -1;
|
|
#endif
|
|
|
|
/* generate 8 bytes of pseudo-random value. */
|
|
memset(&ctxt, 0, sizeof(ctxt));
|
|
MD5Init(&ctxt);
|
|
MD5Update(&ctxt, (u_char *)hostname, hostnamelen);
|
|
MD5Final(digest, &ctxt);
|
|
|
|
/* assumes sizeof(digest) > sizeof(ifid) */
|
|
memcpy(&in6->s6_addr[8], digest, 8);
|
|
|
|
/* make sure to set "u" bit to local, and "g" bit to individual. */
|
|
in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
|
|
in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
|
|
|
|
/* convert EUI64 into IPv6 interface identifier */
|
|
EUI64_TO_IFID(in6);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
generate_tmp_ifid(seed0, seed1, ret)
|
|
u_int8_t *seed0, *ret;
|
|
const u_int8_t *seed1;
|
|
{
|
|
MD5_CTX ctxt;
|
|
u_int8_t seed[16], digest[16], nullbuf[8];
|
|
u_int32_t val32;
|
|
/*
|
|
* interface ID for subnet anycast addresses.
|
|
* XXX: we assume the unicast address range that requires IDs
|
|
* in EUI-64 format.
|
|
*/
|
|
static const uint8_t anycast_id[8] = { 0xfd, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0x80 };
|
|
static const uint8_t isatap_id[4] = { 0x00, 0x00, 0x5e, 0xfe };
|
|
int badid, retry = 0;
|
|
|
|
/* If there's no hisotry, start with a random seed. */
|
|
memset(nullbuf, 0, sizeof(nullbuf));
|
|
if (memcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
|
|
int i;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
val32 = arc4random();
|
|
memcpy(seed + sizeof(val32) * i, &val32, sizeof(val32));
|
|
}
|
|
} else
|
|
memcpy(seed, seed0, 8);
|
|
|
|
/* copy the right-most 64-bits of the given address */
|
|
/* XXX assumption on the size of IFID */
|
|
memcpy(&seed[8], seed1, 8);
|
|
|
|
again:
|
|
/* for debugging purposes only */
|
|
#if 0
|
|
{
|
|
int i;
|
|
|
|
printf("generate_tmp_ifid: new randomized ID from: ");
|
|
for (i = 0; i < 16; i++)
|
|
printf("%02x", seed[i]);
|
|
printf(" ");
|
|
}
|
|
#endif
|
|
|
|
/* generate 16 bytes of pseudo-random value. */
|
|
memset(&ctxt, 0, sizeof(ctxt));
|
|
MD5Init(&ctxt);
|
|
MD5Update(&ctxt, seed, sizeof(seed));
|
|
MD5Final(digest, &ctxt);
|
|
|
|
/*
|
|
* draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (3)
|
|
* Take the left-most 64-bits of the MD5 digest and set bit 6 (the
|
|
* left-most bit is numbered 0) to zero.
|
|
*/
|
|
memcpy(ret, digest, 8);
|
|
ret[0] &= ~EUI64_UBIT;
|
|
|
|
/*
|
|
* Reject inappropriate identifiers according to
|
|
* draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (4)
|
|
* At this moment, we reject following cases:
|
|
* - all 0 identifier
|
|
* - identifiers that conflict with reserved subnet anycast addresses,
|
|
* which are defined in RFC 2526.
|
|
* - identifiers that conflict with ISATAP addresses
|
|
* - identifiers used in our own addresses
|
|
*/
|
|
badid = 0;
|
|
if (memcmp(nullbuf, ret, sizeof(nullbuf)) == 0)
|
|
badid = 1;
|
|
else if (memcmp(anycast_id, ret, 7) == 0 &&
|
|
(anycast_id[7] & ret[7]) == anycast_id[7]) {
|
|
badid = 1;
|
|
} else if (memcmp(isatap_id, ret, sizeof(isatap_id)) == 0)
|
|
badid = 1;
|
|
else {
|
|
struct in6_ifaddr *ia;
|
|
|
|
for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
|
|
if (!memcmp(&ia->ia_addr.sin6_addr.s6_addr[8],
|
|
ret, 8)) {
|
|
badid = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* In the event that an unacceptable identifier has been generated,
|
|
* restart the process, using the right-most 64 bits of the MD5 digest
|
|
* obtained in place of the history value.
|
|
*/
|
|
if (badid) {
|
|
/* for debugging purposes only */
|
|
#if 0
|
|
{
|
|
int i;
|
|
|
|
printf("unacceptable random ID: ");
|
|
for (i = 0; i < 16; i++)
|
|
printf("%02x", digest[i]);
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
|
|
if (++retry < GEN_TEMPID_RETRY_MAX) {
|
|
memcpy(seed, &digest[8], 8);
|
|
goto again;
|
|
} else {
|
|
/*
|
|
* We're so unlucky. Give up for now, and return
|
|
* all 0 IDs to tell the caller not to make a
|
|
* temporary address.
|
|
*/
|
|
nd6log((LOG_NOTICE,
|
|
"generate_tmp_ifid: never found a good ID\n"));
|
|
memset(ret, 0, 8);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (6)
|
|
* Take the rightmost 64-bits of the MD5 digest and save them in
|
|
* stable storage as the history value to be used in the next
|
|
* iteration of the algorithm.
|
|
*/
|
|
memcpy(seed0, &digest[8], 8);
|
|
|
|
/* for debugging purposes only */
|
|
#if 0
|
|
{
|
|
int i;
|
|
|
|
printf("to: ");
|
|
for (i = 0; i < 16; i++)
|
|
printf("%02x", digest[i]);
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
/*
|
|
* Get interface identifier for the specified interface.
|
|
* XXX assumes single sockaddr_dl (AF_LINK address) per an interface
|
|
*/
|
|
int
|
|
in6_get_hw_ifid(ifp, in6)
|
|
struct ifnet *ifp;
|
|
struct in6_addr *in6; /* upper 64bits are preserved */
|
|
{
|
|
struct ifaddr *ifa;
|
|
struct sockaddr_dl *sdl;
|
|
char *addr;
|
|
size_t addrlen;
|
|
static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
|
|
static u_int8_t allone[8] =
|
|
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
|
|
|
|
for (ifa = ifp->if_addrlist.tqh_first;
|
|
ifa;
|
|
ifa = ifa->ifa_list.tqe_next)
|
|
{
|
|
if (ifa->ifa_addr->sa_family != AF_LINK)
|
|
continue;
|
|
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
|
|
if (sdl == NULL)
|
|
continue;
|
|
if (sdl->sdl_alen == 0)
|
|
continue;
|
|
|
|
goto found;
|
|
}
|
|
|
|
return -1;
|
|
|
|
found:
|
|
addr = LLADDR(sdl);
|
|
addrlen = sdl->sdl_alen;
|
|
|
|
switch (ifp->if_type) {
|
|
case IFT_IEEE1394:
|
|
case IFT_IEEE80211:
|
|
/* IEEE1394 uses 16byte length address starting with EUI64 */
|
|
if (addrlen > 8)
|
|
addrlen = 8;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* get EUI64 */
|
|
switch (ifp->if_type) {
|
|
/* IEEE802/EUI64 cases - what others? */
|
|
case IFT_ETHER:
|
|
case IFT_FDDI:
|
|
case IFT_ATM:
|
|
case IFT_IEEE1394:
|
|
case IFT_IEEE80211:
|
|
/* look at IEEE802/EUI64 only */
|
|
if (addrlen != 8 && addrlen != 6)
|
|
return -1;
|
|
|
|
/*
|
|
* check for invalid MAC address - on bsdi, we see it a lot
|
|
* since wildboar configures all-zero MAC on pccard before
|
|
* card insertion.
|
|
*/
|
|
if (memcmp(addr, allzero, addrlen) == 0)
|
|
return -1;
|
|
if (memcmp(addr, allone, addrlen) == 0)
|
|
return -1;
|
|
|
|
/* make EUI64 address */
|
|
if (addrlen == 8)
|
|
memcpy(&in6->s6_addr[8], addr, 8);
|
|
else if (addrlen == 6) {
|
|
in6->s6_addr[8] = addr[0];
|
|
in6->s6_addr[9] = addr[1];
|
|
in6->s6_addr[10] = addr[2];
|
|
in6->s6_addr[11] = 0xff;
|
|
in6->s6_addr[12] = 0xfe;
|
|
in6->s6_addr[13] = addr[3];
|
|
in6->s6_addr[14] = addr[4];
|
|
in6->s6_addr[15] = addr[5];
|
|
}
|
|
break;
|
|
|
|
case IFT_ARCNET:
|
|
if (addrlen != 1)
|
|
return -1;
|
|
if (!addr[0])
|
|
return -1;
|
|
|
|
memset(&in6->s6_addr[8], 0, 8);
|
|
in6->s6_addr[15] = addr[0];
|
|
|
|
/*
|
|
* due to insufficient bitwidth, we mark it local.
|
|
*/
|
|
in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
|
|
in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
|
|
break;
|
|
|
|
case IFT_GIF:
|
|
#ifdef IFT_STF
|
|
case IFT_STF:
|
|
#endif
|
|
/*
|
|
* RFC2893 says: "SHOULD use IPv4 address as ifid source".
|
|
* however, IPv4 address is not very suitable as unique
|
|
* identifier source (can be renumbered).
|
|
* we don't do this.
|
|
*/
|
|
return -1;
|
|
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
/* sanity check: g bit must not indicate "group" */
|
|
if (EUI64_GROUP(in6))
|
|
return -1;
|
|
|
|
/* convert EUI64 into IPv6 interface identifier */
|
|
EUI64_TO_IFID(in6);
|
|
|
|
/*
|
|
* sanity check: ifid must not be all zero, avoid conflict with
|
|
* subnet router anycast
|
|
*/
|
|
if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
|
|
memcmp(&in6->s6_addr[9], allzero, 7) == 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get interface identifier for the specified interface. If it is not
|
|
* available on ifp0, borrow interface identifier from other information
|
|
* sources.
|
|
*/
|
|
static int
|
|
get_ifid(ifp0, altifp, in6)
|
|
struct ifnet *ifp0;
|
|
struct ifnet *altifp; /*secondary EUI64 source*/
|
|
struct in6_addr *in6;
|
|
{
|
|
struct ifnet *ifp;
|
|
|
|
/* first, try to get it from the interface itself */
|
|
if (in6_get_hw_ifid(ifp0, in6) == 0) {
|
|
nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
|
|
if_name(ifp0)));
|
|
goto success;
|
|
}
|
|
|
|
/* try secondary EUI64 source. this basically is for ATM PVC */
|
|
if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
|
|
nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
|
|
if_name(ifp0), if_name(altifp)));
|
|
goto success;
|
|
}
|
|
|
|
/* next, try to get it from some other hardware interface */
|
|
for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
|
|
{
|
|
if (ifp == ifp0)
|
|
continue;
|
|
if (in6_get_hw_ifid(ifp, in6) != 0)
|
|
continue;
|
|
|
|
/*
|
|
* to borrow ifid from other interface, ifid needs to be
|
|
* globally unique
|
|
*/
|
|
if (IFID_UNIVERSAL(in6)) {
|
|
nd6log((LOG_DEBUG,
|
|
"%s: borrow interface identifier from %s\n",
|
|
if_name(ifp0), if_name(ifp)));
|
|
goto success;
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
/* get from hostid - only for certain architectures */
|
|
if (get_hostid_ifid(ifp, in6) == 0) {
|
|
nd6log((LOG_DEBUG,
|
|
"%s: interface identifier generated by hostid\n",
|
|
if_name(ifp0)));
|
|
goto success;
|
|
}
|
|
#endif
|
|
|
|
/* last resort: get from random number source */
|
|
if (get_rand_ifid(ifp, in6) == 0) {
|
|
nd6log((LOG_DEBUG,
|
|
"%s: interface identifier generated by random number\n",
|
|
if_name(ifp0)));
|
|
goto success;
|
|
}
|
|
|
|
printf("%s: failed to get interface identifier\n", if_name(ifp0));
|
|
return -1;
|
|
|
|
success:
|
|
nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
|
|
if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
|
|
in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
|
|
in6->s6_addr[14], in6->s6_addr[15]));
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
in6_ifattach_linklocal(ifp, altifp)
|
|
struct ifnet *ifp;
|
|
struct ifnet *altifp; /*secondary EUI64 source*/
|
|
{
|
|
struct in6_ifaddr *ia;
|
|
struct in6_aliasreq ifra;
|
|
struct nd_prefixctl pr0;
|
|
int i, error;
|
|
|
|
/*
|
|
* configure link-local address.
|
|
*/
|
|
memset(&ifra, 0, sizeof(ifra));
|
|
|
|
/*
|
|
* in6_update_ifa() does not use ifra_name, but we accurately set it
|
|
* for safety.
|
|
*/
|
|
strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
|
|
|
|
ifra.ifra_addr.sin6_family = AF_INET6;
|
|
ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
|
|
if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
|
|
ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
|
|
} else {
|
|
if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
|
|
nd6log((LOG_ERR,
|
|
"%s: no ifid available\n", if_name(ifp)));
|
|
return (-1);
|
|
}
|
|
}
|
|
if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
|
|
return (-1);
|
|
|
|
ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
|
|
ifra.ifra_prefixmask.sin6_family = AF_INET6;
|
|
ifra.ifra_prefixmask.sin6_addr = in6mask64;
|
|
/* link-local addresses should NEVER expire. */
|
|
ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
|
|
ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
|
|
|
|
/*
|
|
* Now call in6_update_ifa() to do a bunch of procedures to configure
|
|
* a link-local address. We can set NULL to the 3rd argument, because
|
|
* we know there's no other link-local address on the interface
|
|
* and therefore we are adding one (instead of updating one).
|
|
*/
|
|
if ((error = in6_update_ifa(ifp, &ifra, NULL,
|
|
IN6_IFAUPDATE_DADDELAY)) != 0) {
|
|
/*
|
|
* XXX: When the interface does not support IPv6, this call
|
|
* would fail in the SIOCSIFADDR ioctl. I believe the
|
|
* notification is rather confusing in this case, so just
|
|
* suppress it. (jinmei@kame.net 20010130)
|
|
*/
|
|
if (error != EAFNOSUPPORT)
|
|
nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
|
|
"configure a link-local address on %s "
|
|
"(errno=%d)\n",
|
|
if_name(ifp), error));
|
|
return (-1);
|
|
}
|
|
|
|
ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
|
|
#ifdef DIAGNOSTIC
|
|
if (!ia) {
|
|
panic("ia == NULL in in6_ifattach_linklocal");
|
|
/* NOTREACHED */
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Make the link-local prefix (fe80::/64%link) as on-link.
|
|
* Since we'd like to manage prefixes separately from addresses,
|
|
* we make an ND6 prefix structure for the link-local prefix,
|
|
* and add it to the prefix list as a never-expire prefix.
|
|
* XXX: this change might affect some existing code base...
|
|
*/
|
|
memset(&pr0, 0, sizeof(pr0));
|
|
pr0.ndpr_ifp = ifp;
|
|
/* this should be 64 at this moment. */
|
|
pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
|
|
pr0.ndpr_prefix = ifra.ifra_addr;
|
|
/* apply the mask for safety. (nd6_prelist_add will apply it again) */
|
|
for (i = 0; i < 4; i++) {
|
|
pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
|
|
in6mask64.s6_addr32[i];
|
|
}
|
|
/*
|
|
* Initialize parameters. The link-local prefix must always be
|
|
* on-link, and its lifetimes never expire.
|
|
*/
|
|
pr0.ndpr_raf_onlink = 1;
|
|
pr0.ndpr_raf_auto = 1; /* probably meaningless */
|
|
pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
|
|
pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
|
|
/*
|
|
* Since there is no other link-local addresses, nd6_prefix_lookup()
|
|
* probably returns NULL. However, we cannot always expect the result.
|
|
* For example, if we first remove the (only) existing link-local
|
|
* address, and then reconfigure another one, the prefix is still
|
|
* valid with referring to the old link-local address.
|
|
*/
|
|
if (nd6_prefix_lookup(&pr0) == NULL) {
|
|
if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
|
|
return (error);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
in6_ifattach_loopback(ifp)
|
|
struct ifnet *ifp; /* must be IFT_LOOP */
|
|
{
|
|
struct in6_aliasreq ifra;
|
|
int error;
|
|
|
|
memset(&ifra, 0, sizeof(ifra));
|
|
|
|
/*
|
|
* in6_update_ifa() does not use ifra_name, but we accurately set it
|
|
* for safety.
|
|
*/
|
|
strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
|
|
|
|
ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
|
|
ifra.ifra_prefixmask.sin6_family = AF_INET6;
|
|
ifra.ifra_prefixmask.sin6_addr = in6mask128;
|
|
|
|
/*
|
|
* Always initialize ia_dstaddr (= broadcast address) to loopback
|
|
* address. Follows IPv4 practice - see in_ifinit().
|
|
*/
|
|
ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
|
|
ifra.ifra_dstaddr.sin6_family = AF_INET6;
|
|
ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
|
|
|
|
ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
|
|
ifra.ifra_addr.sin6_family = AF_INET6;
|
|
ifra.ifra_addr.sin6_addr = in6addr_loopback;
|
|
|
|
/* the loopback address should NEVER expire. */
|
|
ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
|
|
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, NULL, 0)) != 0) {
|
|
nd6log((LOG_ERR, "in6_ifattach_loopback: 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(ifp, name, namelen, sa6)
|
|
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
|
|
*/
|
|
void
|
|
in6_ifattach(ifp, altifp)
|
|
struct ifnet *ifp;
|
|
struct ifnet *altifp; /* secondary EUI64 source */
|
|
{
|
|
struct in6_ifaddr *ia;
|
|
struct in6_addr in6;
|
|
|
|
/* some of the interfaces are inherently not IPv6 capable */
|
|
switch (ifp->if_type) {
|
|
case IFT_BRIDGE:
|
|
#ifdef IFT_PFLOG
|
|
case IFT_PFLOG:
|
|
#endif
|
|
#ifdef IFT_PFSYNC
|
|
case IFT_PFSYNC:
|
|
#endif
|
|
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, "in6_ifattach: "
|
|
"%s has too small MTU, IPv6 not enabled\n",
|
|
if_name(ifp)));
|
|
return;
|
|
}
|
|
|
|
/* create a multicast kludge storage (if we have not had one) */
|
|
in6_createmkludge(ifp);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
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, "in6_ifattach: "
|
|
"%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;
|
|
if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
|
|
if (in6_ifattach_loopback(ifp) != 0)
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* assign a link-local address, if there's none.
|
|
*/
|
|
if (ip6_auto_linklocal) {
|
|
ia = in6ifa_ifpforlinklocal(ifp, 0);
|
|
if (ia == NULL) {
|
|
if (in6_ifattach_linklocal(ifp, altifp) == 0) {
|
|
/* linklocal address assigned */
|
|
} else {
|
|
/* failed to assign linklocal address. bark? */
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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(ifp)
|
|
struct ifnet *ifp;
|
|
{
|
|
struct in6_ifaddr *ia, *oia;
|
|
struct ifaddr *ifa, *next;
|
|
struct rtentry *rt;
|
|
short rtflags;
|
|
struct in6_multi_mship *imm;
|
|
|
|
/* remove ip6_mrouter stuff */
|
|
ip6_mrouter_detach(ifp);
|
|
|
|
/* remove neighbor management table */
|
|
nd6_purge(ifp);
|
|
|
|
/* nuke any of IPv6 addresses we have */
|
|
for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next)
|
|
{
|
|
next = ifa->ifa_list.tqe_next;
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
in6_purgeaddr(ifa);
|
|
}
|
|
|
|
/* undo everything done by in6_ifattach(), just in case */
|
|
for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next)
|
|
{
|
|
next = ifa->ifa_list.tqe_next;
|
|
|
|
if (ifa->ifa_addr->sa_family != AF_INET6
|
|
|| !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
|
|
continue;
|
|
}
|
|
|
|
ia = (struct in6_ifaddr *)ifa;
|
|
|
|
/*
|
|
* leave from multicast groups we have joined for the interface
|
|
*/
|
|
while ((imm = ia->ia6_memberships.lh_first) != NULL) {
|
|
LIST_REMOVE(imm, i6mm_chain);
|
|
in6_leavegroup(imm);
|
|
}
|
|
|
|
/* remove from the routing table */
|
|
if ((ia->ia_flags & IFA_ROUTE) &&
|
|
(rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) {
|
|
rtflags = rt->rt_flags;
|
|
rtfree(rt);
|
|
rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
|
|
(struct sockaddr *)&ia->ia_addr,
|
|
(struct sockaddr *)&ia->ia_prefixmask,
|
|
rtflags, (struct rtentry **)0);
|
|
}
|
|
|
|
/* remove from the linked list */
|
|
TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
|
|
IFAFREE(&ia->ia_ifa);
|
|
|
|
/* also remove from the IPv6 address chain(itojun&jinmei) */
|
|
oia = ia;
|
|
if (oia == (ia = in6_ifaddr))
|
|
in6_ifaddr = ia->ia_next;
|
|
else {
|
|
while (ia->ia_next && (ia->ia_next != oia))
|
|
ia = ia->ia_next;
|
|
if (ia->ia_next)
|
|
ia->ia_next = oia->ia_next;
|
|
else {
|
|
nd6log((LOG_ERR,
|
|
"%s: didn't unlink in6ifaddr from list\n",
|
|
if_name(ifp)));
|
|
}
|
|
}
|
|
|
|
IFAFREE(&oia->ia_ifa);
|
|
}
|
|
|
|
/* cleanup multicast address kludge table, if there is any */
|
|
in6_purgemkludge(ifp);
|
|
|
|
/*
|
|
* remove neighbor management table. we call it twice just to make
|
|
* sure we nuke everything. maybe we need just one call.
|
|
* XXX: since the first call did not release addresses, some prefixes
|
|
* might remain. We should call nd6_purge() again to release the
|
|
* prefixes after removing all addresses above.
|
|
* (Or can we just delay calling nd6_purge until at this point?)
|
|
*/
|
|
nd6_purge(ifp);
|
|
}
|
|
|
|
int
|
|
in6_get_tmpifid(ifp, retbuf, baseid, generate)
|
|
struct ifnet *ifp;
|
|
u_int8_t *retbuf;
|
|
const u_int8_t *baseid;
|
|
int generate;
|
|
{
|
|
u_int8_t nullbuf[8];
|
|
struct nd_ifinfo *ndi = ND_IFINFO(ifp);
|
|
|
|
memset(nullbuf, 0, sizeof(nullbuf));
|
|
if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
|
|
/* we've never created a random ID. Create a new one. */
|
|
generate = 1;
|
|
}
|
|
|
|
if (generate) {
|
|
memcpy(ndi->randomseed1, baseid, sizeof(ndi->randomseed1));
|
|
|
|
/* generate_tmp_ifid will update seedn and buf */
|
|
(void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
|
|
ndi->randomid);
|
|
}
|
|
memcpy(retbuf, ndi->randomid, 8);
|
|
if (generate && memcmp(retbuf, nullbuf, sizeof(nullbuf)) == 0) {
|
|
/* generate_tmp_ifid could not found a good ID. */
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
in6_tmpaddrtimer(ignored_arg)
|
|
void *ignored_arg;
|
|
{
|
|
struct nd_ifinfo *ndi;
|
|
u_int8_t nullbuf[8];
|
|
struct ifnet *ifp;
|
|
int s = splsoftnet();
|
|
|
|
callout_reset(&in6_tmpaddrtimer_ch,
|
|
(ip6_temp_preferred_lifetime - ip6_desync_factor -
|
|
ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL);
|
|
|
|
memset(nullbuf, 0, sizeof(nullbuf));
|
|
for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
|
|
ndi = ND_IFINFO(ifp);
|
|
if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
|
|
/*
|
|
* We've been generating a random ID on this interface.
|
|
* Create a new one.
|
|
*/
|
|
(void)generate_tmp_ifid(ndi->randomseed0,
|
|
ndi->randomseed1, ndi->randomid);
|
|
}
|
|
}
|
|
|
|
splx(s);
|
|
}
|