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NetBSD/sys/netinet6/in6_ifattach.c

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/* $NetBSD: in6_ifattach.c,v 1.68 2006/11/20 04:16:27 dyoung 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 1.68 2006/11/20 04:16:27 dyoung 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(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 };
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
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 */
TAILQ_FOREACH(ifp, &ifnet, if_list) {
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 = TAILQ_FIRST(&ifp->if_addrlist); ifa; ifa = next) {
next = TAILQ_NEXT(ifa, ifa_list);
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
in6_purgeaddr(ifa);
}
/* undo everything done by in6_ifattach(), just in case */
for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa; ifa = next) {
next = TAILQ_NEXT(ifa, ifa_list);
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 = LIST_FIRST(&ia->ia6_memberships)) != 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, &ia->ia_ifa, 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(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);
}
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