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freebsd-skq/sys/netinet6/in6_ifattach.c
jhay 1f7a05a1ef Add IFT_L2VLAN to the list that is capable of supplying the ingredients 
of the EUI64 part of an IPv6 address. Otherwise vlans will all use the
MAC address of the first ethernet interface of the system.

MFC after:	1 week
2010-12-22 11:58:31 +00:00

977 lines
26 KiB
C
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/*-
* 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.
*
* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/proc.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 <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_var.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/mld6_var.h>
#include <netinet6/scope6_var.h>
VNET_DEFINE(unsigned long, in6_maxmtu) = 0;
#ifdef IP6_AUTO_LINKLOCAL
VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL;
#else
VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */
#endif
VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch);
#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
VNET_DECLARE(struct inpcbinfo, ripcbinfo);
#define V_ripcbinfo VNET(ripcbinfo)
static int get_rand_ifid(struct ifnet *, struct in6_addr *);
static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
static int in6_ifattach_loopback(struct ifnet *);
static void in6_purgemaddrs(struct ifnet *);
#define EUI64_GBIT 0x01
#define EUI64_UBIT 0x02
#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (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))
/*
* 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.
*
* in6 - upper 64bits are preserved
*/
static int
get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
{
MD5_CTX ctxt;
struct prison *pr;
u_int8_t digest[16];
int hostnamelen;
pr = curthread->td_ucred->cr_prison;
mtx_lock(&pr->pr_mtx);
hostnamelen = strlen(pr->pr_hostname);
#if 0
/* we need at least several letters as seed for ifid */
if (hostnamelen < 3) {
mtx_unlock(&pr->pr_mtx);
return -1;
}
#endif
/* generate 8 bytes of pseudo-random value. */
bzero(&ctxt, sizeof(ctxt));
MD5Init(&ctxt);
MD5Update(&ctxt, pr->pr_hostname, hostnamelen);
mtx_unlock(&pr->pr_mtx);
MD5Final(digest, &ctxt);
/* assumes sizeof(digest) > sizeof(ifid) */
bcopy(digest, &in6->s6_addr[8], 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(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
{
MD5_CTX ctxt;
u_int8_t seed[16], digest[16], nullbuf[8];
u_int32_t val32;
/* If there's no history, start with a random seed. */
bzero(nullbuf, sizeof(nullbuf));
if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
int i;
for (i = 0; i < 2; i++) {
val32 = arc4random();
bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
}
} else
bcopy(seed0, seed, 8);
/* copy the right-most 64-bits of the given address */
/* XXX assumption on the size of IFID */
bcopy(seed1, &seed[8], 8);
if (0) { /* for debugging purposes only */
int i;
printf("generate_tmp_ifid: new randomized ID from: ");
for (i = 0; i < 16; i++)
printf("%02x", seed[i]);
printf(" ");
}
/* generate 16 bytes of pseudo-random value. */
bzero(&ctxt, sizeof(ctxt));
MD5Init(&ctxt);
MD5Update(&ctxt, seed, sizeof(seed));
MD5Final(digest, &ctxt);
/*
* RFC 3041 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.
*/
bcopy(digest, ret, 8);
ret[0] &= ~EUI64_UBIT;
/*
* XXX: we'd like to ensure that the generated value is not zero
* for simplicity. If the caclculated digest happens to be zero,
* use a random non-zero value as the last resort.
*/
if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
nd6log((LOG_INFO,
"generate_tmp_ifid: computed MD5 value is zero.\n"));
val32 = arc4random();
val32 = 1 + (val32 % (0xffffffff - 1));
}
/*
* RFC 3041 3.2.1. (4)
* 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.
*/
bcopy(&digest[8], seed0, 8);
if (0) { /* for debugging purposes only */
int i;
printf("to: ");
for (i = 0; i < 16; i++)
printf("%02x", digest[i]);
printf("\n");
}
return 0;
}
/*
* Get interface identifier for the specified interface.
* XXX assumes single sockaddr_dl (AF_LINK address) per an interface
*
* in6 - upper 64bits are preserved
*/
int
in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
{
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
u_int8_t *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 };
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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;
}
IF_ADDR_UNLOCK(ifp);
return -1;
found:
IF_ADDR_LOCK_ASSERT(ifp);
addr = LLADDR(sdl);
addrlen = sdl->sdl_alen;
/* get EUI64 */
switch (ifp->if_type) {
case IFT_ETHER:
case IFT_L2VLAN:
case IFT_FDDI:
case IFT_ISO88025:
case IFT_ATM:
case IFT_IEEE1394:
#ifdef IFT_IEEE80211
case IFT_IEEE80211:
#endif
/* IEEE802/EUI64 cases - what others? */
/* IEEE1394 uses 16byte length address starting with EUI64 */
if (addrlen > 8)
addrlen = 8;
/* look at IEEE802/EUI64 only */
if (addrlen != 8 && addrlen != 6) {
IF_ADDR_UNLOCK(ifp);
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 (bcmp(addr, allzero, addrlen) == 0) {
IF_ADDR_UNLOCK(ifp);
return -1;
}
if (bcmp(addr, allone, addrlen) == 0) {
IF_ADDR_UNLOCK(ifp);
return -1;
}
/* make EUI64 address */
if (addrlen == 8)
bcopy(addr, &in6->s6_addr[8], 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) {
IF_ADDR_UNLOCK(ifp);
return -1;
}
if (!addr[0]) {
IF_ADDR_UNLOCK(ifp);
return -1;
}
bzero(&in6->s6_addr[8], 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.
*/
IF_ADDR_UNLOCK(ifp);
return -1;
default:
IF_ADDR_UNLOCK(ifp);
return -1;
}
/* sanity check: g bit must not indicate "group" */
if (EUI64_GROUP(in6)) {
IF_ADDR_UNLOCK(ifp);
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 &&
bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
IF_ADDR_UNLOCK(ifp);
return -1;
}
IF_ADDR_UNLOCK(ifp);
return 0;
}
/*
* Get interface identifier for the specified interface. If it is not
* available on ifp0, borrow interface identifier from other information
* sources.
*
* altifp - secondary EUI64 source
*/
static int
get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
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 */
IFNET_RLOCK_NOSLEEP();
for (ifp = V_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)));
IFNET_RUNLOCK_NOSLEEP();
goto success;
}
}
IFNET_RUNLOCK_NOSLEEP();
/* 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;
}
/*
* altifp - secondary EUI64 source
*/
static int
in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
{
struct in6_ifaddr *ia;
struct in6_aliasreq ifra;
struct nd_prefixctl pr0;
int i, error;
/*
* configure link-local address.
*/
bzero(&ifra, 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 the 3rd argument to NULL, 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
ifa_free(&ia->ia_ifa);
/*
* Make the link-local prefix (fe80::%link/64) 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...
*/
bzero(&pr0, 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;
}
/*
* ifp - must be IFT_LOOP
*/
static int
in6_ifattach_loopback(struct ifnet *ifp)
{
struct in6_aliasreq ifra;
int error;
bzero(&ifra, 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;
/* skip registration to the prefix list. XXX should be temporary. */
ifra.ifra_flags |= IN6_IFF_NOPFX;
/*
* 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(struct ifnet *ifp, const char *name, int namelen,
struct in6_addr *in6)
{
struct prison *pr;
const char *p;
u_char *q;
MD5_CTX ctxt;
u_int8_t digest[16];
char l;
char n[64]; /* a single label must not exceed 63 chars */
/*
* If no name is given and namelen is -1,
* we try to do the hostname lookup ourselves.
*/
if (!name && namelen == -1) {
pr = curthread->td_ucred->cr_prison;
mtx_lock(&pr->pr_mtx);
name = pr->pr_hostname;
namelen = strlen(name);
} else
pr = NULL;
if (!name || !namelen) {
if (pr != NULL)
mtx_unlock(&pr->pr_mtx);
return -1;
}
p = name;
while (p && *p && *p != '.' && p - name < namelen)
p++;
if (p == name || p - name > sizeof(n) - 1) {
if (pr != NULL)
mtx_unlock(&pr->pr_mtx);
return -1; /* label too long */
}
l = p - name;
strncpy(n, name, l);
if (pr != NULL)
mtx_unlock(&pr->pr_mtx);
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. */
bzero(&ctxt, sizeof(ctxt));
MD5Init(&ctxt);
MD5Update(&ctxt, &l, sizeof(l));
MD5Update(&ctxt, n, l);
MD5Final(digest, &ctxt);
bzero(in6, sizeof(*in6));
in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
in6->s6_addr8[11] = 2;
bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
if (in6_setscope(in6, 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;
/* some of the interfaces are inherently not IPv6 capable */
switch (ifp->if_type) {
case IFT_PFLOG:
case IFT_PFSYNC:
case IFT_CARP:
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.
*/
goto statinit;
#endif
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) {
struct ifaddr *ifa;
in6 = in6addr_loopback;
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6);
if (ifa == NULL) {
if (in6_ifattach_loopback(ifp) != 0)
return;
} else
ifa_free(ifa);
}
/*
* assign a link-local address, if there's none.
*/
if (ifp->if_type != IFT_BRIDGE &&
!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) {
int error;
ia = in6ifa_ifpforlinklocal(ifp, 0);
if (ia == NULL) {
error = in6_ifattach_linklocal(ifp, altifp);
#if 0
if (error)
log(LOG_NOTICE, "in6_ifattach_linklocal: "
"failed to add a link-local addr to %s\n",
if_name(ifp));
#endif
} else
ifa_free(&ia->ia_ifa);
}
#ifdef IFT_STF /* XXX */
statinit:
#endif
/* update dynamically. */
if (V_in6_maxmtu < ifp->if_mtu)
V_in6_maxmtu = ifp->if_mtu;
}
/*
* 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)
{
struct in6_ifaddr *ia;
struct ifaddr *ifa, *next;
struct radix_node_head *rnh;
struct rtentry *rt;
short rtflags;
struct sockaddr_in6 sin6;
struct in6_multi_mship *imm;
/* remove neighbor management table */
nd6_purge(ifp);
/* nuke any of IPv6 addresses we have */
TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
in6_purgeaddr(ifa);
}
/* undo everything done by in6_ifattach(), just in case */
TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, 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, 0UL))) {
rtflags = rt->rt_flags;
RTFREE_LOCKED(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 */
IF_ADDR_LOCK(ifp);
TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
IF_ADDR_UNLOCK(ifp);
ifa_free(ifa); /* if_addrhead */
IN6_IFADDR_WLOCK();
TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
IN6_IFADDR_WUNLOCK();
ifa_free(ifa);
}
in6_pcbpurgeif0(&V_udbinfo, ifp);
in6_pcbpurgeif0(&V_ripcbinfo, ifp);
/* leave from all multicast groups joined */
in6_purgemaddrs(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);
/* remove route to link-local allnodes multicast (ff02::1) */
bzero(&sin6, sizeof(sin6));
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_family = AF_INET6;
sin6.sin6_addr = in6addr_linklocal_allnodes;
if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
/* XXX: should not fail */
return;
/* XXX grab lock first to avoid LOR */
rnh = rt_tables_get_rnh(0, AF_INET6);
if (rnh != NULL) {
RADIX_NODE_HEAD_LOCK(rnh);
rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED);
if (rt) {
if (rt->rt_ifp == ifp)
rtexpunge(rt);
RTFREE_LOCKED(rt);
}
RADIX_NODE_HEAD_UNLOCK(rnh);
}
}
int
in6_get_tmpifid(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);
bzero(nullbuf, sizeof(nullbuf));
if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
/* we've never created a random ID. Create a new one. */
generate = 1;
}
if (generate) {
bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
/* generate_tmp_ifid will update seedn and buf */
(void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
ndi->randomid);
}
bcopy(ndi->randomid, retbuf, 8);
return (0);
}
void
in6_tmpaddrtimer(void *arg)
{
CURVNET_SET((struct vnet *) arg);
struct nd_ifinfo *ndi;
u_int8_t nullbuf[8];
struct ifnet *ifp;
callout_reset(&V_in6_tmpaddrtimer_ch,
(V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
bzero(nullbuf, sizeof(nullbuf));
for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
ifp = TAILQ_NEXT(ifp, if_list)) {
ndi = ND_IFINFO(ifp);
if (bcmp(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);
}
}
CURVNET_RESTORE();
}
static void
in6_purgemaddrs(struct ifnet *ifp)
{
LIST_HEAD(,in6_multi) purgeinms;
struct in6_multi *inm, *tinm;
struct ifmultiaddr *ifma;
LIST_INIT(&purgeinms);
IN6_MULTI_LOCK();
/*
* Extract list of in6_multi associated with the detaching ifp
* which the PF_INET6 layer is about to release.
* We need to do this as IF_ADDR_LOCK() may be re-acquired
* by code further down.
*/
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET6 ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in6_multi *)ifma->ifma_protospec;
LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry);
}
IF_ADDR_UNLOCK(ifp);
LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) {
LIST_REMOVE(inm, in6m_entry);
in6m_release_locked(inm);
}
mld_ifdetach(ifp);
IN6_MULTI_UNLOCK();
}
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