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9494d5968f
freebsd-dev/sys/netinet6/in6.c
Brooks Davis 9494d5968f Make faith loadable, unloadable, and clonable.
2001-09-25 18:40:52 +00:00

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/* $FreeBSD$ */
/* $KAME: in6.c,v 1.187 2001/05/24 07:43:59 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.
*/
/*
* Copyright (c) 1982, 1986, 1991, 1993
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)in.c 8.2 (Berkeley) 11/15/93
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#ifndef SCOPEDROUTING
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#endif
#include <netinet6/nd6.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/mld6_var.h>
#include <netinet6/ip6_mroute.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/scope6_var.h>
#ifndef SCOPEDROUTING
#include <netinet6/in6_pcb.h>
#endif
#include <net/net_osdep.h>
MALLOC_DEFINE(M_IPMADDR, "in6_multi", "internet multicast address");
/*
* Definitions of some costant IP6 addresses.
*/
const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
const struct in6_addr in6addr_nodelocal_allnodes =
IN6ADDR_NODELOCAL_ALLNODES_INIT;
const struct in6_addr in6addr_linklocal_allnodes =
IN6ADDR_LINKLOCAL_ALLNODES_INIT;
const struct in6_addr in6addr_linklocal_allrouters =
IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
const struct in6_addr in6mask0 = IN6MASK0;
const struct in6_addr in6mask32 = IN6MASK32;
const struct in6_addr in6mask64 = IN6MASK64;
const struct in6_addr in6mask96 = IN6MASK96;
const struct in6_addr in6mask128 = IN6MASK128;
const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6,
0, 0, IN6ADDR_ANY_INIT, 0};
static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
struct ifnet *, struct thread *));
static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *,
struct sockaddr_in6 *, int));
static void in6_unlink_ifa __P((struct in6_ifaddr *, struct ifnet *));
struct in6_multihead in6_multihead; /* XXX BSS initialization */
int (*faithprefix_p)(struct in6_addr *);
/*
* Subroutine for in6_ifaddloop() and in6_ifremloop().
* This routine does actual work.
*/
static void
in6_ifloop_request(int cmd, struct ifaddr *ifa)
{
struct sockaddr_in6 all1_sa;
struct rtentry *nrt = NULL;
int e;
bzero(&all1_sa, sizeof(all1_sa));
all1_sa.sin6_family = AF_INET6;
all1_sa.sin6_len = sizeof(struct sockaddr_in6);
all1_sa.sin6_addr = in6mask128;
/*
* We specify the address itself as the gateway, and set the
* RTF_LLINFO flag, so that the corresponding host route would have
* the flag, and thus applications that assume traditional behavior
* would be happy. Note that we assume the caller of the function
* (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest,
* which changes the outgoing interface to the loopback interface.
*/
e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr,
(struct sockaddr *)&all1_sa,
RTF_UP|RTF_HOST|RTF_LLINFO, &nrt);
if (e != 0) {
log(LOG_ERR, "in6_ifloop_request: "
"%s operation failed for %s (errno=%d)\n",
cmd == RTM_ADD ? "ADD" : "DELETE",
ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr),
e);
}
/*
* Make sure rt_ifa be equal to IFA, the second argument of the
* function.
* We need this because when we refer to rt_ifa->ia6_flags in
* ip6_input, we assume that the rt_ifa points to the address instead
* of the loopback address.
*/
if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) {
IFAFREE(nrt->rt_ifa);
IFAREF(ifa);
nrt->rt_ifa = ifa;
}
/*
* Report the addition/removal of the address to the routing socket.
* XXX: since we called rtinit for a p2p interface with a destination,
* we end up reporting twice in such a case. Should we rather
* omit the second report?
*/
if (nrt) {
rt_newaddrmsg(cmd, ifa, e, nrt);
if (cmd == RTM_DELETE) {
if (nrt->rt_refcnt <= 0) {
/* XXX: we should free the entry ourselves. */
nrt->rt_refcnt++;
rtfree(nrt);
}
} else {
/* the cmd must be RTM_ADD here */
nrt->rt_refcnt--;
}
}
}
/*
* Add ownaddr as loopback rtentry. We previously add the route only if
* necessary (ex. on a p2p link). However, since we now manage addresses
* separately from prefixes, we should always add the route. We can't
* rely on the cloning mechanism from the corresponding interface route
* any more.
*/
static void
in6_ifaddloop(struct ifaddr *ifa)
{
struct rtentry *rt;
/* If there is no loopback entry, allocate one. */
rt = rtalloc1(ifa->ifa_addr, 0, 0);
if (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 ||
(rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0)
in6_ifloop_request(RTM_ADD, ifa);
if (rt)
rt->rt_refcnt--;
}
/*
* Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
* if it exists.
*/
static void
in6_ifremloop(struct ifaddr *ifa)
{
struct in6_ifaddr *ia;
struct rtentry *rt;
int ia_count = 0;
/*
* Some of BSD variants do not remove cloned routes
* from an interface direct route, when removing the direct route
* (see comments in net/net_osdep.h). Even for variants that do remove
* cloned routes, they could fail to remove the cloned routes when
* we handle multple addresses that share a common prefix.
* So, we should remove the route corresponding to the deleted address
* regardless of the result of in6_is_ifloop_auto().
*/
/*
* Delete the entry only if exact one ifa exists. More than one ifa
* can exist if we assign a same single address to multiple
* (probably p2p) interfaces.
* XXX: we should avoid such a configuration in IPv6...
*/
for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) {
ia_count++;
if (ia_count > 1)
break;
}
}
if (ia_count == 1) {
/*
* Before deleting, check if a corresponding loopbacked host
* route surely exists. With this check, we can avoid to
* delete an interface direct route whose destination is same
* as the address being removed. This can happen when remofing
* a subnet-router anycast address on an interface attahced
* to a shared medium.
*/
rt = rtalloc1(ifa->ifa_addr, 0, 0);
if (rt != NULL && (rt->rt_flags & RTF_HOST) != 0 &&
(rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
rt->rt_refcnt--;
in6_ifloop_request(RTM_DELETE, ifa);
}
}
}
int
in6_ifindex2scopeid(idx)
int idx;
{
struct ifnet *ifp;
struct ifaddr *ifa;
struct sockaddr_in6 *sin6;
if (idx < 0 || if_index < idx)
return -1;
ifp = ifnet_byindex(idx);
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))
return sin6->sin6_scope_id & 0xffff;
}
return -1;
}
int
in6_mask2len(mask, lim0)
struct in6_addr *mask;
u_char *lim0;
{
int x = 0, y;
u_char *lim = lim0, *p;
if (lim0 == NULL ||
lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */
lim = (u_char *)mask + sizeof(*mask);
for (p = (u_char *)mask; p < lim; x++, p++) {
if (*p != 0xff)
break;
}
y = 0;
if (p < lim) {
for (y = 0; y < 8; y++) {
if ((*p & (0x80 >> y)) == 0)
break;
}
}
/*
* when the limit pointer is given, do a stricter check on the
* remaining bits.
*/
if (p < lim) {
if (y != 0 && (*p & (0x00ff >> y)) != 0)
return(-1);
for (p = p + 1; p < lim; p++)
if (*p != 0)
return(-1);
}
return x * 8 + y;
}
void
in6_len2mask(mask, len)
struct in6_addr *mask;
int len;
{
int i;
bzero(mask, sizeof(*mask));
for (i = 0; i < len / 8; i++)
mask->s6_addr8[i] = 0xff;
if (len % 8)
mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff;
}
#define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
#define ia62ifa(ia6) (&((ia6)->ia_ifa))
int
in6_control(so, cmd, data, ifp, td)
struct socket *so;
u_long cmd;
caddr_t data;
struct ifnet *ifp;
struct thread *td;
{
struct in6_ifreq *ifr = (struct in6_ifreq *)data;
struct in6_ifaddr *ia = NULL;
struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
int privileged;
privileged = 0;
if (td == NULL || !suser_td(td))
privileged++;
switch (cmd) {
case SIOCGETSGCNT_IN6:
case SIOCGETMIFCNT_IN6:
return (mrt6_ioctl(cmd, data));
}
if (ifp == NULL)
return(EOPNOTSUPP);
switch (cmd) {
case SIOCSNDFLUSH_IN6:
case SIOCSPFXFLUSH_IN6:
case SIOCSRTRFLUSH_IN6:
case SIOCSDEFIFACE_IN6:
case SIOCSIFINFO_FLAGS:
if (!privileged)
return(EPERM);
/*fall through*/
case OSIOCGIFINFO_IN6:
case SIOCGIFINFO_IN6:
case SIOCGDRLST_IN6:
case SIOCGPRLST_IN6:
case SIOCGNBRINFO_IN6:
case SIOCGDEFIFACE_IN6:
return(nd6_ioctl(cmd, data, ifp));
}
switch (cmd) {
case SIOCSIFPREFIX_IN6:
case SIOCDIFPREFIX_IN6:
case SIOCAIFPREFIX_IN6:
case SIOCCIFPREFIX_IN6:
case SIOCSGIFPREFIX_IN6:
case SIOCGIFPREFIX_IN6:
log(LOG_NOTICE,
"prefix ioctls are now invalidated. "
"please use ifconfig.\n");
return(EOPNOTSUPP);
}
switch(cmd) {
case SIOCSSCOPE6:
if (!privileged)
return(EPERM);
return(scope6_set(ifp, ifr->ifr_ifru.ifru_scope_id));
break;
case SIOCGSCOPE6:
return(scope6_get(ifp, ifr->ifr_ifru.ifru_scope_id));
break;
case SIOCGSCOPE6DEF:
return(scope6_get_default(ifr->ifr_ifru.ifru_scope_id));
break;
}
switch (cmd) {
case SIOCALIFADDR:
case SIOCDLIFADDR:
if (!privileged)
return(EPERM);
/*fall through*/
case SIOCGLIFADDR:
return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
}
/*
* Find address for this interface, if it exists.
*/
if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */
struct sockaddr_in6 *sa6 =
(struct sockaddr_in6 *)&ifra->ifra_addr;
if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
if (sa6->sin6_addr.s6_addr16[1] == 0) {
/* link ID is not embedded by the user */
sa6->sin6_addr.s6_addr16[1] =
htons(ifp->if_index);
} else if (sa6->sin6_addr.s6_addr16[1] !=
htons(ifp->if_index)) {
return(EINVAL); /* link ID contradicts */
}
if (sa6->sin6_scope_id) {
if (sa6->sin6_scope_id !=
(u_int32_t)ifp->if_index)
return(EINVAL);
sa6->sin6_scope_id = 0; /* XXX: good way? */
}
}
ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr);
}
switch (cmd) {
case SIOCSIFADDR_IN6:
case SIOCSIFDSTADDR_IN6:
case SIOCSIFNETMASK_IN6:
/*
* Since IPv6 allows a node to assign multiple addresses
* on a single interface, SIOCSIFxxx ioctls are not suitable
* and should be unused.
*/
/* we decided to obsolete this command (20000704) */
return(EINVAL);
case SIOCDIFADDR_IN6:
/*
* for IPv4, we look for existing in_ifaddr here to allow
* "ifconfig if0 delete" to remove first IPv4 address on the
* interface. For IPv6, as the spec allow multiple interface
* address from the day one, we consider "remove the first one"
* semantics to be not preferable.
*/
if (ia == NULL)
return(EADDRNOTAVAIL);
/* FALLTHROUGH */
case SIOCAIFADDR_IN6:
/*
* We always require users to specify a valid IPv6 address for
* the corresponding operation.
*/
if (ifra->ifra_addr.sin6_family != AF_INET6 ||
ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6))
return(EAFNOSUPPORT);
if (!privileged)
return(EPERM);
break;
case SIOCGIFADDR_IN6:
/* This interface is basically deprecated. use SIOCGIFCONF. */
/* fall through */
case SIOCGIFAFLAG_IN6:
case SIOCGIFNETMASK_IN6:
case SIOCGIFDSTADDR_IN6:
case SIOCGIFALIFETIME_IN6:
/* must think again about its semantics */
if (ia == NULL)
return(EADDRNOTAVAIL);
break;
case SIOCSIFALIFETIME_IN6:
{
struct in6_addrlifetime *lt;
if (!privileged)
return(EPERM);
if (ia == NULL)
return(EADDRNOTAVAIL);
/* sanity for overflow - beware unsigned */
lt = &ifr->ifr_ifru.ifru_lifetime;
if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME
&& lt->ia6t_vltime + time_second < time_second) {
return EINVAL;
}
if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
&& lt->ia6t_pltime + time_second < time_second) {
return EINVAL;
}
break;
}
}
switch (cmd) {
case SIOCGIFADDR_IN6:
ifr->ifr_addr = ia->ia_addr;
break;
case SIOCGIFDSTADDR_IN6:
if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
return(EINVAL);
/*
* XXX: should we check if ifa_dstaddr is NULL and return
* an error?
*/
ifr->ifr_dstaddr = ia->ia_dstaddr;
break;
case SIOCGIFNETMASK_IN6:
ifr->ifr_addr = ia->ia_prefixmask;
break;
case SIOCGIFAFLAG_IN6:
ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
break;
case SIOCGIFSTAT_IN6:
if (ifp == NULL)
return EINVAL;
if (in6_ifstat == NULL || ifp->if_index >= in6_ifstatmax
|| in6_ifstat[ifp->if_index] == NULL) {
/* return EAFNOSUPPORT? */
bzero(&ifr->ifr_ifru.ifru_stat,
sizeof(ifr->ifr_ifru.ifru_stat));
} else
ifr->ifr_ifru.ifru_stat = *in6_ifstat[ifp->if_index];
break;
case SIOCGIFSTAT_ICMP6:
if (ifp == NULL)
return EINVAL;
if (icmp6_ifstat == NULL || ifp->if_index >= icmp6_ifstatmax ||
icmp6_ifstat[ifp->if_index] == NULL) {
/* return EAFNOSUPPORT? */
bzero(&ifr->ifr_ifru.ifru_stat,
sizeof(ifr->ifr_ifru.ifru_icmp6stat));
} else
ifr->ifr_ifru.ifru_icmp6stat =
*icmp6_ifstat[ifp->if_index];
break;
case SIOCGIFALIFETIME_IN6:
ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
break;
case SIOCSIFALIFETIME_IN6:
ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
/* for sanity */
if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
ia->ia6_lifetime.ia6t_expire =
time_second + ia->ia6_lifetime.ia6t_vltime;
} else
ia->ia6_lifetime.ia6t_expire = 0;
if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
ia->ia6_lifetime.ia6t_preferred =
time_second + ia->ia6_lifetime.ia6t_pltime;
} else
ia->ia6_lifetime.ia6t_preferred = 0;
break;
case SIOCAIFADDR_IN6:
{
int i, error = 0;
struct nd_prefix pr0, *pr;
/*
* first, make or update the interface address structure,
* and link it to the list.
*/
if ((error = in6_update_ifa(ifp, ifra, ia)) != 0)
return(error);
/*
* then, make the prefix on-link on the interface.
* XXX: we'd rather create the prefix before the address, but
* we need at least one address to install the corresponding
* interface route, so we configure the address first.
*/
/*
* convert mask to prefix length (prefixmask has already
* been validated in in6_update_ifa().
*/
bzero(&pr0, sizeof(pr0));
pr0.ndpr_ifp = ifp;
pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
NULL);
if (pr0.ndpr_plen == 128)
break; /* we don't need to install a host route. */
pr0.ndpr_prefix = ifra->ifra_addr;
pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr;
/* apply the mask for safety. */
for (i = 0; i < 4; i++) {
pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
}
/*
* XXX: since we don't have enough APIs, we just set inifinity
* to lifetimes. They can be overridden by later advertised
* RAs (when accept_rtadv is non 0), but we'd rather intend
* such a behavior.
*/
pr0.ndpr_raf_onlink = 1; /* should be configurable? */
pr0.ndpr_raf_auto =
((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
/* add the prefix if there's one. */
if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
/*
* nd6_prelist_add will install the corresponding
* interface route.
*/
if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
return(error);
if (pr == NULL) {
log(LOG_ERR, "nd6_prelist_add succedded but "
"no prefix\n");
return(EINVAL); /* XXX panic here? */
}
}
if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
== NULL) {
/* XXX: this should not happen! */
log(LOG_ERR, "in6_control: addition succeeded, but"
" no ifaddr\n");
} else {
if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 &&
ia->ia6_ndpr == NULL) { /* new autoconfed addr */
ia->ia6_ndpr = pr;
pr->ndpr_refcnt++;
/*
* If this is the first autoconf address from
* the prefix, create a temporary address
* as well (when specified).
*/
if (ip6_use_tempaddr &&
pr->ndpr_refcnt == 1) {
int e;
if ((e = in6_tmpifadd(ia, 1)) != 0) {
log(LOG_NOTICE, "in6_control: "
"failed to create a "
"temporary address, "
"errno=%d\n",
e);
}
}
}
/*
* this might affect the status of autoconfigured
* addresses, that is, this address might make
* other addresses detached.
*/
pfxlist_onlink_check();
}
break;
}
case SIOCDIFADDR_IN6:
{
int i = 0;
struct nd_prefix pr0, *pr;
/*
* If the address being deleted is the only one that owns
* the corresponding prefix, expire the prefix as well.
* XXX: theoretically, we don't have to warry about such
* relationship, since we separate the address management
* and the prefix management. We do this, however, to provide
* as much backward compatibility as possible in terms of
* the ioctl operation.
*/
bzero(&pr0, sizeof(pr0));
pr0.ndpr_ifp = ifp;
pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr,
NULL);
if (pr0.ndpr_plen == 128)
goto purgeaddr;
pr0.ndpr_prefix = ia->ia_addr;
pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr;
for (i = 0; i < 4; i++) {
pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
ia->ia_prefixmask.sin6_addr.s6_addr32[i];
}
/*
* The logic of the following condition is a bit complicated.
* We expire the prefix when
* 1. the address obeys autoconfiguration and it is the
* only owner of the associated prefix, or
* 2. the address does not obey autoconf and there is no
* other owner of the prefix.
*/
if ((pr = nd6_prefix_lookup(&pr0)) != NULL &&
(((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 &&
pr->ndpr_refcnt == 1) ||
((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0 &&
pr->ndpr_refcnt == 0))) {
pr->ndpr_expire = 1; /* XXX: just for expiration */
}
purgeaddr:
in6_purgeaddr(&ia->ia_ifa);
break;
}
default:
if (ifp == NULL || ifp->if_ioctl == 0)
return(EOPNOTSUPP);
return((*ifp->if_ioctl)(ifp, cmd, data));
}
return(0);
}
/*
* Update parameters of an IPv6 interface address.
* If necessary, a new entry is created and linked into address chains.
* This function is separated from in6_control().
* XXX: should this be performed under splnet()?
*/
int
in6_update_ifa(ifp, ifra, ia)
struct ifnet *ifp;
struct in6_aliasreq *ifra;
struct in6_ifaddr *ia;
{
int error = 0, hostIsNew = 0, plen = -1;
struct in6_ifaddr *oia;
struct sockaddr_in6 dst6;
struct in6_addrlifetime *lt;
/* Validate parameters */
if (ifp == NULL || ifra == NULL) /* this maybe redundant */
return(EINVAL);
/*
* The destination address for a p2p link must have a family
* of AF_UNSPEC or AF_INET6.
*/
if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
return(EAFNOSUPPORT);
/*
* validate ifra_prefixmask. don't check sin6_family, netmask
* does not carry fields other than sin6_len.
*/
if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
return(EINVAL);
/*
* Because the IPv6 address architecture is classless, we require
* users to specify a (non 0) prefix length (mask) for a new address.
* We also require the prefix (when specified) mask is valid, and thus
* reject a non-consecutive mask.
*/
if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
return(EINVAL);
if (ifra->ifra_prefixmask.sin6_len != 0) {
plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
(u_char *)&ifra->ifra_prefixmask +
ifra->ifra_prefixmask.sin6_len);
if (plen <= 0)
return(EINVAL);
}
else {
/*
* In this case, ia must not be NULL. We just use its prefix
* length.
*/
plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
}
/*
* If the destination address on a p2p interface is specified,
* and the address is a scoped one, validate/set the scope
* zone identifier.
*/
dst6 = ifra->ifra_dstaddr;
if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) &&
(dst6.sin6_family == AF_INET6)) {
int scopeid;
#ifndef SCOPEDROUTING
if ((error = in6_recoverscope(&dst6,
&ifra->ifra_dstaddr.sin6_addr,
ifp)) != 0)
return(error);
#endif
scopeid = in6_addr2scopeid(ifp, &dst6.sin6_addr);
if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */
dst6.sin6_scope_id = scopeid;
else if (dst6.sin6_scope_id != scopeid)
return(EINVAL); /* scope ID mismatch. */
#ifndef SCOPEDROUTING
if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL))
!= 0)
return(error);
dst6.sin6_scope_id = 0; /* XXX */
#endif
}
/*
* The destination address can be specified only for a p2p or a
* loopback interface. If specified, the corresponding prefix length
* must be 128.
*/
if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
/* XXX: noisy message */
log(LOG_INFO, "in6_update_ifa: a destination can be "
"specified for a p2p or a loopback IF only\n");
return(EINVAL);
}
if (plen != 128) {
/*
* The following message seems noisy, but we dare to
* add it for diagnosis.
*/
log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 "
"when dstaddr is specified\n");
return(EINVAL);
}
}
/* lifetime consistency check */
lt = &ifra->ifra_lifetime;
if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME
&& lt->ia6t_vltime + time_second < time_second) {
return EINVAL;
}
if (lt->ia6t_vltime == 0) {
/*
* the following log might be noisy, but this is a typical
* configuration mistake or a tool's bug.
*/
log(LOG_INFO,
"in6_update_ifa: valid lifetime is 0 for %s\n",
ip6_sprintf(&ifra->ifra_addr.sin6_addr));
}
if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
&& lt->ia6t_pltime + time_second < time_second) {
return EINVAL;
}
/*
* If this is a new address, allocate a new ifaddr and link it
* into chains.
*/
if (ia == NULL) {
hostIsNew = 1;
/*
* When in6_update_ifa() is called in a process of a received
* RA, it is called under splnet(). So, we should call malloc
* with M_NOWAIT.
*/
ia = (struct in6_ifaddr *)
malloc(sizeof(*ia), M_IFADDR, M_NOWAIT);
if (ia == NULL)
return (ENOBUFS);
bzero((caddr_t)ia, sizeof(*ia));
/* Initialize the address and masks */
ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
ia->ia_addr.sin6_family = AF_INET6;
ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
/*
* XXX: some functions expect that ifa_dstaddr is not
* NULL for p2p interfaces.
*/
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;
if ((oia = in6_ifaddr) != NULL) {
for ( ; oia->ia_next; oia = oia->ia_next)
continue;
oia->ia_next = ia;
} else
in6_ifaddr = ia;
TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa,
ifa_list);
}
/* set prefix mask */
if (ifra->ifra_prefixmask.sin6_len) {
/*
* We prohibit changing the prefix length of an existing
* address, because
* + such an operation should be rare in IPv6, and
* + the operation would confuse prefix management.
*/
if (ia->ia_prefixmask.sin6_len &&
in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
log(LOG_INFO, "in6_update_ifa: the prefix length of an"
" existing (%s) address should not be changed\n",
ip6_sprintf(&ia->ia_addr.sin6_addr));
error = EINVAL;
goto unlink;
}
ia->ia_prefixmask = ifra->ifra_prefixmask;
}
/*
* If a new destination address is specified, scrub the old one and
* install the new destination. Note that the interface must be
* p2p or loopback (see the check above.)
*/
if (dst6.sin6_family == AF_INET6 &&
!IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr,
&ia->ia_dstaddr.sin6_addr)) {
int e;
if ((ia->ia_flags & IFA_ROUTE) != 0 &&
(e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
!= 0) {
log(LOG_ERR, "in6_update_ifa: failed to remove "
"a route to the old destination: %s\n",
ip6_sprintf(&ia->ia_addr.sin6_addr));
/* proceed anyway... */
}
else
ia->ia_flags &= ~IFA_ROUTE;
ia->ia_dstaddr = dst6;
}
/* reset the interface and routing table appropriately. */
if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
goto unlink;
/*
* Beyond this point, we should call in6_purgeaddr upon an error,
* not just go to unlink.
*/
#if 0 /* disable this mechanism for now */
/* update prefix list */
if (hostIsNew &&
(ifra->ifra_flags & IN6_IFF_NOPFX) == 0) { /* XXX */
int iilen;
iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - plen;
if ((error = in6_prefix_add_ifid(iilen, ia)) != 0) {
in6_purgeaddr((struct ifaddr *)ia);
return(error);
}
}
#endif
if ((ifp->if_flags & IFF_MULTICAST) != 0) {
struct sockaddr_in6 mltaddr, mltmask;
struct in6_multi *in6m;
if (hostIsNew) {
/*
* join solicited multicast addr for new host id
*/
struct in6_addr llsol;
bzero(&llsol, sizeof(struct in6_addr));
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] =
ifra->ifra_addr.sin6_addr.s6_addr32[3];
llsol.s6_addr8[12] = 0xff;
(void)in6_addmulti(&llsol, ifp, &error);
if (error != 0) {
log(LOG_WARNING,
"in6_update_ifa: addmulti failed for "
"%s on %s (errno=%d)\n",
ip6_sprintf(&llsol), if_name(ifp),
error);
in6_purgeaddr((struct ifaddr *)ia);
return(error);
}
}
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 (error != 0) {
log(LOG_WARNING,
"in6_update_ifa: addmulti failed for "
"%s on %s (errno=%d)\n",
ip6_sprintf(&mltaddr.sin6_addr),
if_name(ifp), error);
}
}
/*
* join node information group address
*/
#define hostnamelen strlen(hostname)
if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr)
== 0) {
IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
if (in6m == NULL && ia != NULL) {
(void)in6_addmulti(&mltaddr.sin6_addr,
ifp, &error);
if (error != 0) {
log(LOG_WARNING, "in6_update_ifa: "
"addmulti failed for "
"%s on %s (errno=%d)\n",
ip6_sprintf(&mltaddr.sin6_addr),
if_name(ifp), error);
}
}
}
#undef hostnamelen
/*
* join node-local all-nodes address, on loopback.
* XXX: since "node-local" is obsoleted by interface-local,
* we have to join the group on every interface with
* some interface-boundary restriction.
*/
if (ifp->if_flags & IFF_LOOPBACK) {
struct in6_ifaddr *ia_loop;
struct in6_addr loop6 = in6addr_loopback;
ia_loop = in6ifa_ifpwithaddr(ifp, &loop6);
mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
if (in6m == NULL && ia_loop != NULL) {
rtrequest(RTM_ADD,
(struct sockaddr *)&mltaddr,
(struct sockaddr *)&ia_loop->ia_addr,
(struct sockaddr *)&mltmask,
RTF_UP,
(struct rtentry **)0);
(void)in6_addmulti(&mltaddr.sin6_addr, ifp,
&error);
if (error != 0) {
log(LOG_WARNING, "in6_update_ifa: "
"addmulti failed for %s on %s "
"(errno=%d)\n",
ip6_sprintf(&mltaddr.sin6_addr),
if_name(ifp), error);
}
}
}
}
ia->ia6_flags = ifra->ifra_flags;
ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/
ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */
ia->ia6_lifetime = ifra->ifra_lifetime;
/* for sanity */
if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
ia->ia6_lifetime.ia6t_expire =
time_second + ia->ia6_lifetime.ia6t_vltime;
} else
ia->ia6_lifetime.ia6t_expire = 0;
if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
ia->ia6_lifetime.ia6t_preferred =
time_second + ia->ia6_lifetime.ia6t_pltime;
} else
ia->ia6_lifetime.ia6t_preferred = 0;
/*
* make sure to initialize ND6 information. this is to workaround
* issues with interfaces with IPv6 addresses, which have never brought
* up. We are assuming that it is safe to nd6_ifattach multiple times.
*/
nd6_ifattach(ifp);
/*
* Perform DAD, if needed.
* XXX It may be of use, if we can administratively
* disable DAD.
*/
if (in6if_do_dad(ifp) && (ifra->ifra_flags & IN6_IFF_NODAD) == 0) {
ia->ia6_flags |= IN6_IFF_TENTATIVE;
nd6_dad_start((struct ifaddr *)ia, NULL);
}
return(error);
unlink:
/*
* XXX: if a change of an existing address failed, keep the entry
* anyway.
*/
if (hostIsNew)
in6_unlink_ifa(ia, ifp);
return(error);
}
void
in6_purgeaddr(ifa)
struct ifaddr *ifa;
{
struct ifnet *ifp = ifa->ifa_ifp;
struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
/* stop DAD processing */
nd6_dad_stop(ifa);
/*
* delete route to the destination of the address being purged.
* The interface must be p2p or loopback in this case.
*/
if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) {
int e;
if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
!= 0) {
log(LOG_ERR, "in6_purgeaddr: failed to remove "
"a route to the p2p destination: %s on %s, "
"errno=%d\n",
ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp),
e);
/* proceed anyway... */
}
else
ia->ia_flags &= ~IFA_ROUTE;
}
/* Remove ownaddr's loopback rtentry, if it exists. */
in6_ifremloop(&(ia->ia_ifa));
if (ifp->if_flags & IFF_MULTICAST) {
/*
* delete solicited multicast addr for deleting host id
*/
struct in6_multi *in6m;
struct in6_addr llsol;
bzero(&llsol, sizeof(struct in6_addr));
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;
IN6_LOOKUP_MULTI(llsol, ifp, in6m);
if (in6m)
in6_delmulti(in6m);
}
in6_unlink_ifa(ia, ifp);
}
static void
in6_unlink_ifa(ia, ifp)
struct in6_ifaddr *ia;
struct ifnet *ifp;
{
int plen, iilen;
struct in6_ifaddr *oia;
int s = splnet();
TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
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 {
/* search failed */
printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
}
}
if (oia->ia6_ifpr) { /* check for safety */
plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL);
iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen;
in6_prefix_remove_ifid(iilen, oia);
}
/*
* When an autoconfigured address is being removed, release the
* reference to the base prefix. Also, since the release might
* affect the status of other (detached) addresses, call
* pfxlist_onlink_check().
*/
if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) {
if (oia->ia6_ndpr == NULL) {
log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address "
"%p has no prefix\n", oia);
} else {
oia->ia6_ndpr->ndpr_refcnt--;
oia->ia6_flags &= ~IN6_IFF_AUTOCONF;
oia->ia6_ndpr = NULL;
}
pfxlist_onlink_check();
}
/*
* release another refcnt for the link from in6_ifaddr.
* Note that we should decrement the refcnt at least once for all *BSD.
*/
IFAFREE(&oia->ia_ifa);
splx(s);
}
void
in6_purgeif(ifp)
struct ifnet *ifp;
{
struct ifaddr *ifa, *nifa;
for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa)
{
nifa = TAILQ_NEXT(ifa, ifa_list);
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
in6_purgeaddr(ifa);
}
in6_ifdetach(ifp);
}
/*
* SIOC[GAD]LIFADDR.
* SIOCGLIFADDR: get first address. (?)
* SIOCGLIFADDR with IFLR_PREFIX:
* get first address that matches the specified prefix.
* SIOCALIFADDR: add the specified address.
* SIOCALIFADDR with IFLR_PREFIX:
* add the specified prefix, filling hostid part from
* the first link-local address. prefixlen must be <= 64.
* SIOCDLIFADDR: delete the specified address.
* SIOCDLIFADDR with IFLR_PREFIX:
* delete the first address that matches the specified prefix.
* return values:
* EINVAL on invalid parameters
* EADDRNOTAVAIL on prefix match failed/specified address not found
* other values may be returned from in6_ioctl()
*
* NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
* this is to accomodate address naming scheme other than RFC2374,
* in the future.
* RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
* address encoding scheme. (see figure on page 8)
*/
static int
in6_lifaddr_ioctl(so, cmd, data, ifp, td)
struct socket *so;
u_long cmd;
caddr_t data;
struct ifnet *ifp;
struct thread *td;
{
struct if_laddrreq *iflr = (struct if_laddrreq *)data;
struct ifaddr *ifa;
struct sockaddr *sa;
/* sanity checks */
if (!data || !ifp) {
panic("invalid argument to in6_lifaddr_ioctl");
/*NOTRECHED*/
}
switch (cmd) {
case SIOCGLIFADDR:
/* address must be specified on GET with IFLR_PREFIX */
if ((iflr->flags & IFLR_PREFIX) == 0)
break;
/*FALLTHROUGH*/
case SIOCALIFADDR:
case SIOCDLIFADDR:
/* address must be specified on ADD and DELETE */
sa = (struct sockaddr *)&iflr->addr;
if (sa->sa_family != AF_INET6)
return EINVAL;
if (sa->sa_len != sizeof(struct sockaddr_in6))
return EINVAL;
/* XXX need improvement */
sa = (struct sockaddr *)&iflr->dstaddr;
if (sa->sa_family && sa->sa_family != AF_INET6)
return EINVAL;
if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
return EINVAL;
break;
default: /*shouldn't happen*/
#if 0
panic("invalid cmd to in6_lifaddr_ioctl");
/*NOTREACHED*/
#else
return EOPNOTSUPP;
#endif
}
if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
return EINVAL;
switch (cmd) {
case SIOCALIFADDR:
{
struct in6_aliasreq ifra;
struct in6_addr *hostid = NULL;
int prefixlen;
if ((iflr->flags & IFLR_PREFIX) != 0) {
struct sockaddr_in6 *sin6;
/*
* hostid is to fill in the hostid part of the
* address. hostid points to the first link-local
* address attached to the interface.
*/
ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
if (!ifa)
return EADDRNOTAVAIL;
hostid = IFA_IN6(ifa);
/* prefixlen must be <= 64. */
if (64 < iflr->prefixlen)
return EINVAL;
prefixlen = iflr->prefixlen;
/* hostid part must be zero. */
sin6 = (struct sockaddr_in6 *)&iflr->addr;
if (sin6->sin6_addr.s6_addr32[2] != 0
|| sin6->sin6_addr.s6_addr32[3] != 0) {
return EINVAL;
}
} else
prefixlen = iflr->prefixlen;
/* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
bzero(&ifra, sizeof(ifra));
bcopy(iflr->iflr_name, ifra.ifra_name,
sizeof(ifra.ifra_name));
bcopy(&iflr->addr, &ifra.ifra_addr,
((struct sockaddr *)&iflr->addr)->sa_len);
if (hostid) {
/* fill in hostid part */
ifra.ifra_addr.sin6_addr.s6_addr32[2] =
hostid->s6_addr32[2];
ifra.ifra_addr.sin6_addr.s6_addr32[3] =
hostid->s6_addr32[3];
}
if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/
bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
((struct sockaddr *)&iflr->dstaddr)->sa_len);
if (hostid) {
ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
hostid->s6_addr32[2];
ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
hostid->s6_addr32[3];
}
}
ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
}
case SIOCGLIFADDR:
case SIOCDLIFADDR:
{
struct in6_ifaddr *ia;
struct in6_addr mask, candidate, match;
struct sockaddr_in6 *sin6;
int cmp;
bzero(&mask, sizeof(mask));
if (iflr->flags & IFLR_PREFIX) {
/* lookup a prefix rather than address. */
in6_len2mask(&mask, iflr->prefixlen);
sin6 = (struct sockaddr_in6 *)&iflr->addr;
bcopy(&sin6->sin6_addr, &match, sizeof(match));
match.s6_addr32[0] &= mask.s6_addr32[0];
match.s6_addr32[1] &= mask.s6_addr32[1];
match.s6_addr32[2] &= mask.s6_addr32[2];
match.s6_addr32[3] &= mask.s6_addr32[3];
/* if you set extra bits, that's wrong */
if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
return EINVAL;
cmp = 1;
} else {
if (cmd == SIOCGLIFADDR) {
/* on getting an address, take the 1st match */
cmp = 0; /*XXX*/
} else {
/* on deleting an address, do exact match */
in6_len2mask(&mask, 128);
sin6 = (struct sockaddr_in6 *)&iflr->addr;
bcopy(&sin6->sin6_addr, &match, sizeof(match));
cmp = 1;
}
}
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (!cmp)
break;
bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
#ifndef SCOPEDROUTING
/*
* XXX: this is adhoc, but is necessary to allow
* a user to specify fe80::/64 (not /10) for a
* link-local address.
*/
if (IN6_IS_ADDR_LINKLOCAL(&candidate))
candidate.s6_addr16[1] = 0;
#endif
candidate.s6_addr32[0] &= mask.s6_addr32[0];
candidate.s6_addr32[1] &= mask.s6_addr32[1];
candidate.s6_addr32[2] &= mask.s6_addr32[2];
candidate.s6_addr32[3] &= mask.s6_addr32[3];
if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
break;
}
if (!ifa)
return EADDRNOTAVAIL;
ia = ifa2ia6(ifa);
if (cmd == SIOCGLIFADDR) {
#ifndef SCOPEDROUTING
struct sockaddr_in6 *s6;
#endif
/* fill in the if_laddrreq structure */
bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
#ifndef SCOPEDROUTING /* XXX see above */
s6 = (struct sockaddr_in6 *)&iflr->addr;
if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
s6->sin6_addr.s6_addr16[1] = 0;
s6->sin6_scope_id =
in6_addr2scopeid(ifp, &s6->sin6_addr);
}
#endif
if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
ia->ia_dstaddr.sin6_len);
#ifndef SCOPEDROUTING /* XXX see above */
s6 = (struct sockaddr_in6 *)&iflr->dstaddr;
if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
s6->sin6_addr.s6_addr16[1] = 0;
s6->sin6_scope_id =
in6_addr2scopeid(ifp,
&s6->sin6_addr);
}
#endif
} else
bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
iflr->prefixlen =
in6_mask2len(&ia->ia_prefixmask.sin6_addr,
NULL);
iflr->flags = ia->ia6_flags; /*XXX*/
return 0;
} else {
struct in6_aliasreq ifra;
/* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
bzero(&ifra, sizeof(ifra));
bcopy(iflr->iflr_name, ifra.ifra_name,
sizeof(ifra.ifra_name));
bcopy(&ia->ia_addr, &ifra.ifra_addr,
ia->ia_addr.sin6_len);
if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
ia->ia_dstaddr.sin6_len);
} else {
bzero(&ifra.ifra_dstaddr,
sizeof(ifra.ifra_dstaddr));
}
bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
ia->ia_prefixmask.sin6_len);
ifra.ifra_flags = ia->ia6_flags;
return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
ifp, td);
}
}
}
return EOPNOTSUPP; /*just for safety*/
}
/*
* Initialize an interface's intetnet6 address
* and routing table entry.
*/
static int
in6_ifinit(ifp, ia, sin6, newhost)
struct ifnet *ifp;
struct in6_ifaddr *ia;
struct sockaddr_in6 *sin6;
int newhost;
{
int error = 0, plen, ifacount = 0;
int s = splimp();
struct ifaddr *ifa;
/*
* Give the interface a chance to initialize
* if this is its first address,
* and to validate the address if necessary.
*/
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
if (ifa->ifa_addr == NULL)
continue; /* just for safety */
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ifacount++;
}
ia->ia_addr = *sin6;
if (ifacount <= 1 && ifp->if_ioctl &&
(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
splx(s);
return(error);
}
splx(s);
ia->ia_ifa.ifa_metric = ifp->if_metric;
/* we could do in(6)_socktrim here, but just omit it at this moment. */
/*
* Special case:
* If the destination address is specified for a point-to-point
* interface, install a route to the destination as an interface
* direct route.
*/
plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) {
if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD,
RTF_UP | RTF_HOST)) != 0)
return(error);
ia->ia_flags |= IFA_ROUTE;
}
if (plen < 128) {
/*
* The RTF_CLONING flag is necessary for in6_is_ifloop_auto().
*/
ia->ia_ifa.ifa_flags |= RTF_CLONING;
}
/* Add ownaddr as loopback rtentry, if necessary(ex. on p2p link). */
if (newhost) {
/* set the rtrequest function to create llinfo */
ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
in6_ifaddloop(&(ia->ia_ifa));
}
return(error);
}
/*
* Add an address to the list of IP6 multicast addresses for a
* given interface.
*/
struct in6_multi *
in6_addmulti(maddr6, ifp, errorp)
struct in6_addr *maddr6;
struct ifnet *ifp;
int *errorp;
{
struct in6_multi *in6m;
struct sockaddr_in6 sin6;
struct ifmultiaddr *ifma;
int s = splnet();
*errorp = 0;
/*
* Call generic routine to add membership or increment
* refcount. It wants addresses in the form of a sockaddr,
* so we build one here (being careful to zero the unused bytes).
*/
bzero(&sin6, sizeof sin6);
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof sin6;
sin6.sin6_addr = *maddr6;
*errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma);
if (*errorp) {
splx(s);
return 0;
}
/*
* If ifma->ifma_protospec is null, then if_addmulti() created
* a new record. Otherwise, we are done.
*/
if (ifma->ifma_protospec != 0)
return ifma->ifma_protospec;
/* XXX - if_addmulti uses M_WAITOK. Can this really be called
at interrupt time? If so, need to fix if_addmulti. XXX */
in6m = (struct in6_multi *)malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT);
if (in6m == NULL) {
splx(s);
return (NULL);
}
bzero(in6m, sizeof *in6m);
in6m->in6m_addr = *maddr6;
in6m->in6m_ifp = ifp;
in6m->in6m_ifma = ifma;
ifma->ifma_protospec = in6m;
LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry);
/*
* Let MLD6 know that we have joined a new IP6 multicast
* group.
*/
mld6_start_listening(in6m);
splx(s);
return(in6m);
}
/*
* Delete a multicast address record.
*/
void
in6_delmulti(in6m)
struct in6_multi *in6m;
{
struct ifmultiaddr *ifma = in6m->in6m_ifma;
int s = splnet();
if (ifma->ifma_refcount == 1) {
/*
* No remaining claims to this record; let MLD6 know
* that we are leaving the multicast group.
*/
mld6_stop_listening(in6m);
ifma->ifma_protospec = 0;
LIST_REMOVE(in6m, in6m_entry);
free(in6m, M_IPMADDR);
}
/* XXX - should be separate API for when we have an ifma? */
if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
splx(s);
}
/*
* Find an IPv6 interface link-local address specific to an interface.
*/
struct in6_ifaddr *
in6ifa_ifpforlinklocal(ifp, ignoreflags)
struct ifnet *ifp;
int ignoreflags;
{
struct ifaddr *ifa;
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
if (ifa->ifa_addr == NULL)
continue; /* just for safety */
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
if ((((struct in6_ifaddr *)ifa)->ia6_flags &
ignoreflags) != 0)
continue;
break;
}
}
return((struct in6_ifaddr *)ifa);
}
/*
* find the internet address corresponding to a given interface and address.
*/
struct in6_ifaddr *
in6ifa_ifpwithaddr(ifp, addr)
struct ifnet *ifp;
struct in6_addr *addr;
{
struct ifaddr *ifa;
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
if (ifa->ifa_addr == NULL)
continue; /* just for safety */
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
break;
}
return((struct in6_ifaddr *)ifa);
}
/*
* Convert IP6 address to printable (loggable) representation.
*/
static char digits[] = "0123456789abcdef";
static int ip6round = 0;
char *
ip6_sprintf(addr)
const struct in6_addr *addr;
{
static char ip6buf[8][48];
int i;
char *cp;
u_short *a = (u_short *)addr;
u_char *d;
int dcolon = 0;
ip6round = (ip6round + 1) & 7;
cp = ip6buf[ip6round];
for (i = 0; i < 8; i++) {
if (dcolon == 1) {
if (*a == 0) {
if (i == 7)
*cp++ = ':';
a++;
continue;
} else
dcolon = 2;
}
if (*a == 0) {
if (dcolon == 0 && *(a + 1) == 0) {
if (i == 0)
*cp++ = ':';
*cp++ = ':';
dcolon = 1;
} else {
*cp++ = '0';
*cp++ = ':';
}
a++;
continue;
}
d = (u_char *)a;
*cp++ = digits[*d >> 4];
*cp++ = digits[*d++ & 0xf];
*cp++ = digits[*d >> 4];
*cp++ = digits[*d & 0xf];
*cp++ = ':';
a++;
}
*--cp = 0;
return(ip6buf[ip6round]);
}
int
in6_localaddr(in6)
struct in6_addr *in6;
{
struct in6_ifaddr *ia;
if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
return 1;
for (ia = in6_ifaddr; ia; ia = ia->ia_next)
if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
&ia->ia_prefixmask.sin6_addr))
return 1;
return (0);
}
int
in6_is_addr_deprecated(sa6)
struct sockaddr_in6 *sa6;
{
struct in6_ifaddr *ia;
for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
&sa6->sin6_addr) &&
#ifdef SCOPEDROUTING
ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id &&
#endif
(ia->ia6_flags & IN6_IFF_DEPRECATED) != 0)
return(1); /* true */
/* XXX: do we still have to go thru the rest of the list? */
}
return(0); /* false */
}
/*
* return length of part which dst and src are equal
* hard coding...
*/
int
in6_matchlen(src, dst)
struct in6_addr *src, *dst;
{
int match = 0;
u_char *s = (u_char *)src, *d = (u_char *)dst;
u_char *lim = s + 16, r;
while (s < lim)
if ((r = (*d++ ^ *s++)) != 0) {
while (r < 128) {
match++;
r <<= 1;
}
break;
} else
match += 8;
return match;
}
/* XXX: to be scope conscious */
int
in6_are_prefix_equal(p1, p2, len)
struct in6_addr *p1, *p2;
int len;
{
int bytelen, bitlen;
/* sanity check */
if (0 > len || len > 128) {
log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
len);
return(0);
}
bytelen = len / 8;
bitlen = len % 8;
if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
return(0);
if (p1->s6_addr[bytelen] >> (8 - bitlen) !=
p2->s6_addr[bytelen] >> (8 - bitlen))
return(0);
return(1);
}
void
in6_prefixlen2mask(maskp, len)
struct in6_addr *maskp;
int len;
{
u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
int bytelen, bitlen, i;
/* sanity check */
if (0 > len || len > 128) {
log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
len);
return;
}
bzero(maskp, sizeof(*maskp));
bytelen = len / 8;
bitlen = len % 8;
for (i = 0; i < bytelen; i++)
maskp->s6_addr[i] = 0xff;
if (bitlen)
maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
}
/*
* return the best address out of the same scope
*/
struct in6_ifaddr *
in6_ifawithscope(oifp, dst)
struct ifnet *oifp;
struct in6_addr *dst;
{
int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0;
int blen = -1;
struct ifaddr *ifa;
struct ifnet *ifp;
struct in6_ifaddr *ifa_best = NULL;
if (oifp == NULL) {
#if 0
printf("in6_ifawithscope: output interface is not specified\n");
#endif
return(NULL);
}
/*
* We search for all addresses on all interfaces from the beginning.
* Comparing an interface with the outgoing interface will be done
* only at the final stage of tiebreaking.
*/
for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
{
/*
* We can never take an address that breaks the scope zone
* of the destination.
*/
if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst))
continue;
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
int tlen = -1, dscopecmp, bscopecmp, matchcmp;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
src_scope = in6_addrscope(IFA_IN6(ifa));
/*
* Don't use an address before completing DAD
* nor a duplicated address.
*/
if (((struct in6_ifaddr *)ifa)->ia6_flags &
IN6_IFF_NOTREADY)
continue;
/* XXX: is there any case to allow anycasts? */
if (((struct in6_ifaddr *)ifa)->ia6_flags &
IN6_IFF_ANYCAST)
continue;
if (((struct in6_ifaddr *)ifa)->ia6_flags &
IN6_IFF_DETACHED)
continue;
/*
* If this is the first address we find,
* keep it anyway.
*/
if (ifa_best == NULL)
goto replace;
/*
* ifa_best is never NULL beyond this line except
* within the block labeled "replace".
*/
/*
* If ifa_best has a smaller scope than dst and
* the current address has a larger one than
* (or equal to) dst, always replace ifa_best.
* Also, if the current address has a smaller scope
* than dst, ignore it unless ifa_best also has a
* smaller scope.
* Consequently, after the two if-clause below,
* the followings must be satisfied:
* (scope(src) < scope(dst) &&
* scope(best) < scope(dst))
* OR
* (scope(best) >= scope(dst) &&
* scope(src) >= scope(dst))
*/
if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 &&
IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0)
goto replace; /* (A) */
if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 &&
IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0)
continue; /* (B) */
/*
* A deprecated address SHOULD NOT be used in new
* communications if an alternate (non-deprecated)
* address is available and has sufficient scope.
* RFC 2462, Section 5.5.4.
*/
if (((struct in6_ifaddr *)ifa)->ia6_flags &
IN6_IFF_DEPRECATED) {
/*
* Ignore any deprecated addresses if
* specified by configuration.
*/
if (!ip6_use_deprecated)
continue;
/*
* If we have already found a non-deprecated
* candidate, just ignore deprecated addresses.
*/
if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED)
== 0)
continue;
}
/*
* A non-deprecated address is always preferred
* to a deprecated one regardless of scopes and
* address matching (Note invariants ensured by the
* conditions (A) and (B) above.)
*/
if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) &&
(((struct in6_ifaddr *)ifa)->ia6_flags &
IN6_IFF_DEPRECATED) == 0)
goto replace;
/*
* When we use temporary addresses described in
* RFC 3041, we prefer temporary addresses to
* public autoconf addresses. Again, note the
* invariants from (A) and (B). Also note that we
* don't have any preference between static addresses
* and autoconf addresses (despite of whether or not
* the latter is temporary or public.)
*/
if (ip6_use_tempaddr) {
struct in6_ifaddr *ifat;
ifat = (struct in6_ifaddr *)ifa;
if ((ifa_best->ia6_flags &
(IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
== IN6_IFF_AUTOCONF &&
(ifat->ia6_flags &
(IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
== (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) {
goto replace;
}
if ((ifa_best->ia6_flags &
(IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
== (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) &&
(ifat->ia6_flags &
(IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
== IN6_IFF_AUTOCONF) {
continue;
}
}
/*
* At this point, we have two cases:
* 1. we are looking at a non-deprecated address,
* and ifa_best is also non-deprecated.
* 2. we are looking at a deprecated address,
* and ifa_best is also deprecated.
* Also, we do not have to consider a case where
* the scope of if_best is larger(smaller) than dst and
* the scope of the current address is smaller(larger)
* than dst. Such a case has already been covered.
* Tiebreaking is done according to the following
* items:
* - the scope comparison between the address and
* dst (dscopecmp)
* - the scope comparison between the address and
* ifa_best (bscopecmp)
* - if the address match dst longer than ifa_best
* (matchcmp)
* - if the address is on the outgoing I/F (outI/F)
*
* Roughly speaking, the selection policy is
* - the most important item is scope. The same scope
* is best. Then search for a larger scope.
* Smaller scopes are the last resort.
* - A deprecated address is chosen only when we have
* no address that has an enough scope, but is
* prefered to any addresses of smaller scopes
* (this must be already done above.)
* - addresses on the outgoing I/F are preferred to
* ones on other interfaces if none of above
* tiebreaks. In the table below, the column "bI"
* means if the best_ifa is on the outgoing
* interface, and the column "sI" means if the ifa
* is on the outgoing interface.
* - If there is no other reasons to choose one,
* longest address match against dst is considered.
*
* The precise decision table is as follows:
* dscopecmp bscopecmp match bI oI | replace?
* N/A equal N/A Y N | No (1)
* N/A equal N/A N Y | Yes (2)
* N/A equal larger N/A | Yes (3)
* N/A equal !larger N/A | No (4)
* larger larger N/A N/A | No (5)
* larger smaller N/A N/A | Yes (6)
* smaller larger N/A N/A | Yes (7)
* smaller smaller N/A N/A | No (8)
* equal smaller N/A N/A | Yes (9)
* equal larger (already done at A above)
*/
dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope);
bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope);
if (bscopecmp == 0) {
struct ifnet *bifp = ifa_best->ia_ifp;
if (bifp == oifp && ifp != oifp) /* (1) */
continue;
if (bifp != oifp && ifp == oifp) /* (2) */
goto replace;
/*
* Both bifp and ifp are on the outgoing
* interface, or both two are on a different
* interface from the outgoing I/F.
* now we need address matching against dst
* for tiebreaking.
*/
tlen = in6_matchlen(IFA_IN6(ifa), dst);
matchcmp = tlen - blen;
if (matchcmp > 0) /* (3) */
goto replace;
continue; /* (4) */
}
if (dscopecmp > 0) {
if (bscopecmp > 0) /* (5) */
continue;
goto replace; /* (6) */
}
if (dscopecmp < 0) {
if (bscopecmp > 0) /* (7) */
goto replace;
continue; /* (8) */
}
/* now dscopecmp must be 0 */
if (bscopecmp < 0)
goto replace; /* (9) */
replace:
ifa_best = (struct in6_ifaddr *)ifa;
blen = tlen >= 0 ? tlen :
in6_matchlen(IFA_IN6(ifa), dst);
best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr);
}
}
/* count statistics for future improvements */
if (ifa_best == NULL)
ip6stat.ip6s_sources_none++;
else {
if (oifp == ifa_best->ia_ifp)
ip6stat.ip6s_sources_sameif[best_scope]++;
else
ip6stat.ip6s_sources_otherif[best_scope]++;
if (best_scope == dst_scope)
ip6stat.ip6s_sources_samescope[best_scope]++;
else
ip6stat.ip6s_sources_otherscope[best_scope]++;
if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) != 0)
ip6stat.ip6s_sources_deprecated[best_scope]++;
}
return(ifa_best);
}
/*
* return the best address out of the same scope. if no address was
* found, return the first valid address from designated IF.
*/
struct in6_ifaddr *
in6_ifawithifp(ifp, dst)
struct ifnet *ifp;
struct in6_addr *dst;
{
int dst_scope = in6_addrscope(dst), blen = -1, tlen;
struct ifaddr *ifa;
struct in6_ifaddr *besta = 0;
struct in6_ifaddr *dep[2]; /*last-resort: deprecated*/
dep[0] = dep[1] = NULL;
/*
* We first look for addresses in the same scope.
* If there is one, return it.
* If two or more, return one which matches the dst longest.
* If none, return one of global addresses assigned other ifs.
*/
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
continue; /* XXX: is there any case to allow anycast? */
if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
continue; /* don't use this interface */
if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
continue;
if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
if (ip6_use_deprecated)
dep[0] = (struct in6_ifaddr *)ifa;
continue;
}
if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
/*
* call in6_matchlen() as few as possible
*/
if (besta) {
if (blen == -1)
blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
tlen = in6_matchlen(IFA_IN6(ifa), dst);
if (tlen > blen) {
blen = tlen;
besta = (struct in6_ifaddr *)ifa;
}
} else
besta = (struct in6_ifaddr *)ifa;
}
}
if (besta)
return(besta);
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
continue; /* XXX: is there any case to allow anycast? */
if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
continue; /* don't use this interface */
if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
continue;
if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
if (ip6_use_deprecated)
dep[1] = (struct in6_ifaddr *)ifa;
continue;
}
return (struct in6_ifaddr *)ifa;
}
/* use the last-resort values, that are, deprecated addresses */
if (dep[0])
return dep[0];
if (dep[1])
return dep[1];
return NULL;
}
/*
* perform DAD when interface becomes IFF_UP.
*/
void
in6_if_up(ifp)
struct ifnet *ifp;
{
struct ifaddr *ifa;
struct in6_ifaddr *ia;
int dad_delay; /* delay ticks before DAD output */
/*
* special cases, like 6to4, are handled in in6_ifattach
*/
in6_ifattach(ifp, NULL);
dad_delay = 0;
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ia = (struct in6_ifaddr *)ifa;
if (ia->ia6_flags & IN6_IFF_TENTATIVE)
nd6_dad_start(ifa, &dad_delay);
}
}
int
in6if_do_dad(ifp)
struct ifnet *ifp;
{
if ((ifp->if_flags & IFF_LOOPBACK) != 0)
return(0);
switch (ifp->if_type) {
#ifdef IFT_DUMMY
case IFT_DUMMY:
#endif
case IFT_FAITH:
/*
* These interfaces do not have the IFF_LOOPBACK flag,
* but loop packets back. We do not have to do DAD on such
* interfaces. We should even omit it, because loop-backed
* NS would confuse the DAD procedure.
*/
return(0);
default:
/*
* Our DAD routine requires the interface up and running.
* However, some interfaces can be up before the RUNNING
* status. Additionaly, users may try to assign addresses
* before the interface becomes up (or running).
* We simply skip DAD in such a case as a work around.
* XXX: we should rather mark "tentative" on such addresses,
* and do DAD after the interface becomes ready.
*/
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) !=
(IFF_UP|IFF_RUNNING))
return(0);
return(1);
}
}
/*
* Calculate max IPv6 MTU through all the interfaces and store it
* to in6_maxmtu.
*/
void
in6_setmaxmtu()
{
unsigned long maxmtu = 0;
struct ifnet *ifp;
for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
{
if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
nd_ifinfo[ifp->if_index].linkmtu > maxmtu)
maxmtu = nd_ifinfo[ifp->if_index].linkmtu;
}
if (maxmtu) /* update only when maxmtu is positive */
in6_maxmtu = maxmtu;
}
/*
* Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
* v4 mapped addr or v4 compat addr
*/
void
in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
{
bzero(sin, sizeof(*sin));
sin->sin_len = sizeof(struct sockaddr_in);
sin->sin_family = AF_INET;
sin->sin_port = sin6->sin6_port;
sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
}
/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
void
in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
{
bzero(sin6, sizeof(*sin6));
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_family = AF_INET6;
sin6->sin6_port = sin->sin_port;
sin6->sin6_addr.s6_addr32[0] = 0;
sin6->sin6_addr.s6_addr32[1] = 0;
sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
}
/* Convert sockaddr_in6 into sockaddr_in. */
void
in6_sin6_2_sin_in_sock(struct sockaddr *nam)
{
struct sockaddr_in *sin_p;
struct sockaddr_in6 sin6;
/*
* Save original sockaddr_in6 addr and convert it
* to sockaddr_in.
*/
sin6 = *(struct sockaddr_in6 *)nam;
sin_p = (struct sockaddr_in *)nam;
in6_sin6_2_sin(sin_p, &sin6);
}
/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
void
in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
{
struct sockaddr_in *sin_p;
struct sockaddr_in6 *sin6_p;
MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
M_WAITOK);
sin_p = (struct sockaddr_in *)*nam;
in6_sin_2_v4mapsin6(sin_p, sin6_p);
FREE(*nam, M_SONAME);
*nam = (struct sockaddr *)sin6_p;
}
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