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NetBSD/sys/netinet6/in6_ifattach.c

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/* $NetBSD: in6_ifattach.c,v 1.35 2001/04/13 23:30:25 thorpej Exp $ */
/* $KAME: in6_ifattach.c,v 1.100 2001/02/07 08:25:45 itojun 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/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/ip6_var.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <net/net_osdep.h>
struct in6_ifstat **in6_ifstat = NULL;
struct icmp6_ifstat **icmp6_ifstat = NULL;
size_t in6_ifstatmax = 0;
size_t icmp6_ifstatmax = 0;
unsigned long in6_maxmtu = 0;
static int get_rand_ifid __P((struct ifnet *, struct in6_addr *));
static int get_hw_ifid __P((struct ifnet *, struct in6_addr *));
static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *));
static int in6_ifattach_addaddr __P((struct ifnet *, struct in6_ifaddr *));
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 (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.
*/
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. */
bzero(&ctxt, sizeof(ctxt));
MD5Init(&ctxt);
MD5Update(&ctxt, hostname, hostnamelen);
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;
}
/*
* Get interface identifier for the specified interface.
* XXX assumes single sockaddr_dl (AF_LINK address) per an interface
*/
static int
get_hw_ifid(ifp, in6)
struct ifnet *ifp;
struct in6_addr *in6; /*upper 64bits are preserved */
{
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 };
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;
/* get EUI64 */
switch (ifp->if_type) {
case IFT_ETHER:
case IFT_FDDI:
case IFT_ATM:
case IFT_IEEE1394:
/* 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)
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)
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)
return -1;
if (!addr[0])
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.
*/
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.
*/
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 (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 && 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 (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;
}
}
/* 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;
}
/*
* configure IPv6 interface address. XXX code duplicated with in.c
*/
static int
in6_ifattach_addaddr(ifp, ia)
struct ifnet *ifp;
struct in6_ifaddr *ia;
{
struct in6_ifaddr *oia;
struct ifaddr *ifa;
int error;
int rtflag;
struct in6_addr llsol;
/*
* initialize if_addrlist, if we are the very first one
*/
ifa = TAILQ_FIRST(&ifp->if_addrlist);
if (ifa == NULL) {
TAILQ_INIT(&ifp->if_addrlist);
}
/*
* link the interface address to global list
*/
TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
IFAREF(&ia->ia_ifa);
/*
* Also link into the IPv6 address chain beginning with in6_ifaddr.
* kazu opposed it, but itojun & jinmei wanted.
*/
if ((oia = in6_ifaddr) != NULL) {
for (; oia->ia_next; oia = oia->ia_next)
continue;
oia->ia_next = ia;
} else
in6_ifaddr = ia;
IFAREF(&ia->ia_ifa);
/*
* give the interface a chance to initialize, in case this
* is the first address to be added.
*/
if (ifp->if_ioctl != NULL) {
int s;
s = splnet();
error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
splx(s);
} else
error = 0;
if (error) {
switch (error) {
case EAFNOSUPPORT:
printf("%s: IPv6 not supported\n", if_name(ifp));
break;
default:
printf("%s: SIOCSIFADDR error %d\n", if_name(ifp),
error);
break;
}
/* undo changes */
TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
IFAFREE(&ia->ia_ifa);
if (oia)
oia->ia_next = ia->ia_next;
else
in6_ifaddr = ia->ia_next;
IFAFREE(&ia->ia_ifa);
return -1;
}
/* configure link-layer address resolution */
rtflag = 0;
if (IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr, &in6mask128))
rtflag = RTF_HOST;
else {
switch (ifp->if_type) {
case IFT_LOOP:
#ifdef IFT_STF
case IFT_STF:
#endif
rtflag = 0;
break;
default:
ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
ia->ia_ifa.ifa_flags |= RTF_CLONING;
rtflag = RTF_CLONING;
break;
}
}
/* add route to the interface. */
rtrequest(RTM_ADD,
(struct sockaddr *)&ia->ia_addr,
(struct sockaddr *)&ia->ia_addr,
(struct sockaddr *)&ia->ia_prefixmask,
RTF_UP | rtflag,
(struct rtentry **)0);
ia->ia_flags |= IFA_ROUTE;
if ((rtflag & RTF_CLONING) != 0 &&
(ifp->if_flags & IFF_MULTICAST) != 0) {
/* Restore saved multicast addresses (if any). */
in6_restoremkludge(ia, ifp);
/*
* join solicited multicast address
*/
bzero(&llsol, sizeof(llsol));
llsol.s6_addr16[0] = htons(0xff02);
llsol.s6_addr16[1] = htons(ifp->if_index);
llsol.s6_addr32[1] = 0;
llsol.s6_addr32[2] = htonl(1);
llsol.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3];
llsol.s6_addr8[12] = 0xff;
(void)in6_addmulti(&llsol, ifp, &error);
/* XXX should we run DAD on other interface types? */
switch (ifp->if_type) {
#if 1
case IFT_ARCNET:
case IFT_ETHER:
case IFT_FDDI:
case IFT_IEEE1394:
#else
default:
#endif
/* mark the address TENTATIVE, if needed. */
ia->ia6_flags |= IN6_IFF_TENTATIVE;
/* nd6_dad_start() will be called in in6_if_up */
}
}
return 0;
}
static int
in6_ifattach_linklocal(ifp, altifp)
struct ifnet *ifp;
struct ifnet *altifp; /*secondary EUI64 source*/
{
struct in6_ifaddr *ia;
/*
* configure link-local address
*/
ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_WAITOK);
bzero((caddr_t)ia, sizeof(*ia));
ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
if (ifp->if_flags & IFF_POINTOPOINT)
ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
else
ia->ia_ifa.ifa_dstaddr = NULL;
ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
ia->ia_ifp = ifp;
bzero(&ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
ia->ia_prefixmask.sin6_family = AF_INET6;
ia->ia_prefixmask.sin6_addr = in6mask64;
/* just in case */
bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr));
ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
ia->ia_dstaddr.sin6_family = AF_INET6;
bzero(&ia->ia_addr, sizeof(ia->ia_addr));
ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6);
ia->ia_addr.sin6_family = AF_INET6;
ia->ia_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
ia->ia_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
ia->ia_addr.sin6_addr.s6_addr32[1] = 0;
if (ifp->if_flags & IFF_LOOPBACK) {
ia->ia_addr.sin6_addr.s6_addr32[2] = 0;
ia->ia_addr.sin6_addr.s6_addr32[3] = htonl(1);
} else {
if (get_ifid(ifp, altifp, &ia->ia_addr.sin6_addr) != 0) {
nd6log((LOG_ERR,
"%s: no ifid available\n", if_name(ifp)));
free(ia, M_IFADDR);
return -1;
}
}
ia->ia_ifa.ifa_metric = ifp->if_metric;
if (in6_ifattach_addaddr(ifp, ia) != 0) {
/* ia will be freed on failure */
return -1;
}
return 0;
}
static int
in6_ifattach_loopback(ifp)
struct ifnet *ifp; /* must be IFT_LOOP */
{
struct in6_ifaddr *ia;
/*
* configure link-local address
*/
ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_WAITOK);
bzero((caddr_t)ia, sizeof(*ia));
ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
ia->ia_ifp = ifp;
bzero(&ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
ia->ia_prefixmask.sin6_family = AF_INET6;
ia->ia_prefixmask.sin6_addr = in6mask128;
/*
* Always initialize ia_dstaddr (= broadcast address) to loopback
* address, to make getifaddr happier.
*
* For BSDI, it is mandatory. The BSDI version of
* ifa_ifwithroute() rejects to add a route to the loopback
* interface. Even for other systems, loopback looks somewhat
* special.
*/
bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr));
ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
ia->ia_dstaddr.sin6_family = AF_INET6;
ia->ia_dstaddr.sin6_addr = in6addr_loopback;
bzero(&ia->ia_addr, sizeof(ia->ia_addr));
ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6);
ia->ia_addr.sin6_family = AF_INET6;
ia->ia_addr.sin6_addr = in6addr_loopback;
ia->ia_ifa.ifa_metric = ifp->if_metric;
if (in6_ifattach_addaddr(ifp, ia) != 0) {
/* ia will be freed on failure */
return -1;
}
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 */
{
static size_t if_indexlim = 8;
struct sockaddr_in6 mltaddr;
struct sockaddr_in6 mltmask;
struct sockaddr_in6 gate;
struct sockaddr_in6 mask;
struct in6_ifaddr *ia;
struct in6_addr in6;
/*
* We have some arrays that should be indexed by if_index.
* since if_index will grow dynamically, they should grow too.
* struct in6_ifstat **in6_ifstat
* struct icmp6_ifstat **icmp6_ifstat
*/
if (in6_ifstat == NULL || icmp6_ifstat == NULL ||
if_index >= if_indexlim) {
size_t n;
caddr_t q;
size_t olim;
olim = if_indexlim;
while (if_index >= if_indexlim)
if_indexlim <<= 1;
/* grow in6_ifstat */
n = if_indexlim * sizeof(struct in6_ifstat *);
q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK);
bzero(q, n);
if (in6_ifstat) {
bcopy((caddr_t)in6_ifstat, q,
olim * sizeof(struct in6_ifstat *));
free((caddr_t)in6_ifstat, M_IFADDR);
}
in6_ifstat = (struct in6_ifstat **)q;
in6_ifstatmax = if_indexlim;
/* grow icmp6_ifstat */
n = if_indexlim * sizeof(struct icmp6_ifstat *);
q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK);
bzero(q, n);
if (icmp6_ifstat) {
bcopy((caddr_t)icmp6_ifstat, q,
olim * sizeof(struct icmp6_ifstat *));
free((caddr_t)icmp6_ifstat, M_IFADDR);
}
icmp6_ifstat = (struct icmp6_ifstat **)q;
icmp6_ifstatmax = if_indexlim;
}
/*
* quirks based on interface type
*/
switch (ifp->if_type) {
#ifdef IFT_STF
case IFT_STF:
/*
* 6to4 interface is a very speical kind of beast.
* no multicast, no linklocal (based on 03 draft).
*/
goto statinit;
#endif
default:
break;
}
/*
* usually, we require multicast capability to the interface
*/
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
printf("%s: not multicast capable, IPv6 not enabled\n",
if_name(ifp));
return;
}
/*
* assign link-local address, if there's none
*/
ia = in6ifa_ifpforlinklocal(ifp, 0);
if (ia == NULL) {
if (in6_ifattach_linklocal(ifp, altifp) != 0)
return;
ia = in6ifa_ifpforlinklocal(ifp, 0);
if (ia == NULL) {
printf("%s: failed to add link-local address\n",
if_name(ifp));
/* we can't initialize multicasts without link-local */
goto statinit;
}
}
if (ifp->if_flags & IFF_POINTOPOINT) {
/*
* route local address to loopback
*/
bzero(&gate, sizeof(gate));
gate.sin6_len = sizeof(struct sockaddr_in6);
gate.sin6_family = AF_INET6;
gate.sin6_addr = in6addr_loopback;
bzero(&mask, sizeof(mask));
mask.sin6_len = sizeof(struct sockaddr_in6);
mask.sin6_family = AF_INET6;
mask.sin6_addr = in6mask64;
rtrequest(RTM_ADD,
(struct sockaddr *)&ia->ia_addr,
(struct sockaddr *)&gate,
(struct sockaddr *)&mask,
RTF_UP|RTF_HOST,
(struct rtentry **)0);
}
/*
* assign loopback address for loopback interface
* XXX multiple loopback interface case
*/
in6 = in6addr_loopback;
if (ifp->if_flags & IFF_LOOPBACK) {
if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
if (in6_ifattach_loopback(ifp) != 0)
return;
}
}
#ifdef DIAGNOSTIC
if (!ia) {
panic("ia == NULL in in6_ifattach");
/*NOTREACHED*/
}
#endif
/*
* join multicast
*/
if (ifp->if_flags & IFF_MULTICAST) {
int error; /* not used */
struct in6_multi *in6m;
/* Restore saved multicast addresses (if any). */
in6_restoremkludge(ia, ifp);
bzero(&mltmask, sizeof(mltmask));
mltmask.sin6_len = sizeof(struct sockaddr_in6);
mltmask.sin6_family = AF_INET6;
mltmask.sin6_addr = in6mask32;
/*
* join link-local all-nodes address
*/
bzero(&mltaddr, sizeof(mltaddr));
mltaddr.sin6_len = sizeof(struct sockaddr_in6);
mltaddr.sin6_family = AF_INET6;
mltaddr.sin6_addr = in6addr_linklocal_allnodes;
mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
if (in6m == NULL) {
rtrequest(RTM_ADD,
(struct sockaddr *)&mltaddr,
(struct sockaddr *)&ia->ia_addr,
(struct sockaddr *)&mltmask,
RTF_UP|RTF_CLONING, /* xxx */
(struct rtentry **)0);
(void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error);
}
if (ifp->if_flags & IFF_LOOPBACK) {
in6 = in6addr_loopback;
ia = in6ifa_ifpwithaddr(ifp, &in6);
/*
* join node-local all-nodes address, on loopback
*/
mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
if (in6m == NULL && ia != NULL) {
rtrequest(RTM_ADD,
(struct sockaddr *)&mltaddr,
(struct sockaddr *)&ia->ia_addr,
(struct sockaddr *)&mltmask,
RTF_UP,
(struct rtentry **)0);
(void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error);
}
}
}
statinit:;
/* update dynamically. */
if (in6_maxmtu < ifp->if_mtu)
in6_maxmtu = ifp->if_mtu;
if (in6_ifstat[ifp->if_index] == NULL) {
in6_ifstat[ifp->if_index] = (struct in6_ifstat *)
malloc(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK);
bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat));
}
if (icmp6_ifstat[ifp->if_index] == NULL) {
icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *)
malloc(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK);
bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat));
}
/* initialize NDP variables */
nd6_ifattach(ifp);
}
/*
* NOTE: in6_ifdetach() does not support loopback if at this moment.
*/
void
in6_ifdetach(ifp)
struct ifnet *ifp;
{
struct in6_ifaddr *ia, *oia;
struct ifaddr *ifa, *next;
struct rtentry *rt;
short rtflags;
struct sockaddr_in6 sin6;
/* nuke prefix list. this may try to remove some of ifaddrs as well */
in6_purgeprefix(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, ifp);
}
/* 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;
/* 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 */
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;
sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
rt = rtalloc1((struct sockaddr *)&sin6, 0);
if (rt && rt->rt_ifp == ifp) {
rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt),
rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
rtfree(rt);
}
}
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