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src/sys/netinet6/in6_ifattach.c

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/* $OpenBSD: in6_ifattach.c,v 1.122 2023/07/09 19:06:48 bluhm 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/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <crypto/sha2.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/nd6.h>
#ifdef MROUTING
#include <netinet6/ip6_mroute.h>
#endif
void in6_get_rand_ifid(struct ifnet *, struct in6_addr *);
int in6_get_hw_ifid(struct ifnet *, struct in6_addr *);
void in6_get_ifid(struct ifnet *, struct in6_addr *);
int in6_ifattach_loopback(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 random interface identifier.
*
* in6 - upper 64bits are preserved
*/
void
in6_get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
{
arc4random_buf(&in6->s6_addr32[2], 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);
}
/*
* Get interface identifier for the specified interface.
*
* in6 - upper 64bits are preserved
*/
int
in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
{
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 };
sdl = ifp->if_sadl;
if (sdl == NULL || sdl->sdl_alen == 0)
return -1;
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_CARP:
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 (bcmp(addr, allzero, addrlen) == 0)
return -1;
if (bcmp(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_GIF:
/*
* 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 &&
bcmp(&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.
*/
void
in6_get_ifid(struct ifnet *ifp0, 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",
ifp0->if_xname));
goto success;
}
/* next, try to get it from some other hardware interface */
TAILQ_FOREACH(ifp, &ifnetlist, if_list) {
if (ifp == ifp0)
continue;
if (in6_get_hw_ifid(ifp, in6) == 0)
goto success;
}
/* last resort: get from random number source */
in6_get_rand_ifid(ifp, in6);
nd6log((LOG_DEBUG,
"%s: interface identifier generated by random number\n",
ifp0->if_xname));
success:
nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
ifp0->if_xname, 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]));
}
/*
* ifid - used as EUI64 if not NULL, overrides other EUI64 sources
*/
int
in6_ifattach_linklocal(struct ifnet *ifp, struct in6_addr *ifid)
{
struct in6_aliasreq ifra;
struct in6_ifaddr *ia6;
int error, flags;
NET_ASSERT_LOCKED();
/*
* configure link-local address.
*/
bzero(&ifra, sizeof(ifra));
strlcpy(ifra.ifra_name, ifp->if_xname, 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_addr16[0] = htons(0xfe80);
ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
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 (ifid) {
ifra.ifra_addr.sin6_addr = *ifid;
ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
ifra.ifra_addr.sin6_addr.s6_addr[8] &= ~EUI64_GBIT;
ifra.ifra_addr.sin6_addr.s6_addr[8] |= EUI64_UBIT;
} else
in6_get_ifid(ifp, &ifra.ifra_addr.sin6_addr);
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;
/*
* XXX: Some P2P interfaces seem not to send packets just after
* becoming up, so we skip p2p interfaces for safety.
*/
if (in6if_do_dad(ifp) && ((ifp->if_flags & IFF_POINTOPOINT) == 0))
ifra.ifra_flags |= IN6_IFF_TENTATIVE;
error = in6_update_ifa(ifp, &ifra, in6ifa_ifpforlinklocal(ifp, 0));
if (error != 0)
return (error);
ia6 = in6ifa_ifpforlinklocal(ifp, 0);
/* Perform DAD, if needed. */
if (ia6->ia6_flags & IN6_IFF_TENTATIVE)
nd6_dad_start(&ia6->ia_ifa);
if (ifp->if_flags & IFF_LOOPBACK) {
if_addrhooks_run(ifp);
return (0); /* No need to install a connected route. */
}
flags = RTF_CONNECTED | RTF_MPATH;
if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
flags |= RTF_CLONING;
error = rt_ifa_add(&ia6->ia_ifa, flags, ia6->ia_ifa.ifa_addr,
ifp->if_rdomain);
if (error) {
in6_purgeaddr(&ia6->ia_ifa);
return (error);
}
if_addrhooks_run(ifp);
return (0);
}
int
in6_ifattach_loopback(struct ifnet *ifp)
{
struct in6_addr in6 = in6addr_loopback;
struct in6_aliasreq ifra;
KASSERT(ifp->if_flags & IFF_LOOPBACK);
if (in6ifa_ifpwithaddr(ifp, &in6) != NULL)
return (0);
bzero(&ifra, sizeof(ifra));
strlcpy(ifra.ifra_name, ifp->if_xname, 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 are sure that this is a newly assigned address, so we can set
* NULL to the 3rd arg.
*/
return (in6_update_ifa(ifp, &ifra, NULL));
}
/*
* 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
*/
int
in6_ifattach(struct ifnet *ifp)
{
/* some of the interfaces are inherently not IPv6 capable */
switch (ifp->if_type) {
case IFT_BRIDGE:
case IFT_ENC:
case IFT_PFLOG:
case IFT_PFSYNC:
return (0);
}
/*
* 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)
return (EINVAL);
if (nd6_need_cache(ifp) && (ifp->if_flags & IFF_MULTICAST) == 0)
return (EINVAL);
/*
* Assign loopback address if this lo(4) interface is the
* default for its rdomain.
*/
if ((ifp->if_flags & IFF_LOOPBACK) &&
(ifp->if_index == rtable_loindex(ifp->if_rdomain))) {
int error;
error = in6_ifattach_loopback(ifp);
if (error)
return (error);
}
switch (ifp->if_type) {
case IFT_WIREGUARD:
return (0);
}
/* Assign a link-local address, if there's none. */
if (in6ifa_ifpforlinklocal(ifp, 0) == NULL) {
if (in6_ifattach_linklocal(ifp, NULL) != 0) {
/* failed to assign linklocal address. bark? */
}
}
return (0);
}
/*
* NOTE: in6_ifdetach() does not support loopback if at this moment.
*/
void
in6_ifdetach(struct ifnet *ifp)
{
struct ifaddr *ifa, *next;
struct rtentry *rt;
struct sockaddr_in6 sin6;
#ifdef MROUTING
/* remove ip6_mrouter stuff */
ip6_mrouter_detach(ifp);
#endif
/* nuke any of IPv6 addresses we have */
TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrlist, ifa_list, next) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
in6_purgeaddr(ifa);
if_addrhooks_run(ifp);
}
/*
* Remove neighbor management table. Must be called after
* purging addresses.
*/
nd6_purge(ifp);
/* remove route to interface local allnodes multicast (ff01::1) */
bzero(&sin6, sizeof(sin6));
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_family = AF_INET6;
sin6.sin6_addr = in6addr_intfacelocal_allnodes;
sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
rt = rtalloc(sin6tosa(&sin6), 0, ifp->if_rdomain);
if (rt && rt->rt_ifidx == ifp->if_index)
rtdeletemsg(rt, ifp, ifp->if_rdomain);
rtfree(rt);
/* 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;
sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
rt = rtalloc(sin6tosa(&sin6), 0, ifp->if_rdomain);
if (rt && rt->rt_ifidx == ifp->if_index)
rtdeletemsg(rt, ifp, ifp->if_rdomain);
rtfree(rt);
if (ifp->if_xflags & (IFXF_AUTOCONF6 | IFXF_AUTOCONF6TEMP))
ifp->if_xflags &= ~(IFXF_AUTOCONF6 | IFXF_AUTOCONF6TEMP);
}
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