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/* $NetBSD: in6.c,v 1.91 2005/02/01 15:29:23 drochner Exp $ */
/* $KAME: in6.c,v 1.198 2001/07/18 09:12:38 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. 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: in6.c,v 1.91 2005/02/01 15:29:23 drochner Exp $");
#include "opt_inet.h"
#include "opt_pfil_hooks.h"
#include <sys/param.h>
#include <sys/ioctl.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 <net/if_ether.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/mld6_var.h>
#include <netinet6/ip6_mroute.h>
#include <netinet6/in6_ifattach.h>
#include <net/net_osdep.h>
#ifdef PFIL_HOOKS
#include <net/pfil.h>
#endif
MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options");
/* enable backward compatibility code for obsoleted ioctls */
#define COMPAT_IN6IFIOCTL
/*
* Definitions of some constant 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 proc *));
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 *));
/*
* This structure is used to keep track of in6_multi chains which belong to
* deleted interface addresses.
*/
static LIST_HEAD(, multi6_kludge) in6_mk; /* XXX BSS initialization */
struct multi6_kludge {
LIST_ENTRY(multi6_kludge) mk_entry;
struct ifnet *mk_ifp;
struct in6_multihead mk_head;
};
/*
* 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 lo_sa;
struct sockaddr_in6 all1_sa;
struct rtentry *nrt = NULL;
int e;
bzero(&lo_sa, sizeof(lo_sa));
bzero(&all1_sa, sizeof(all1_sa));
lo_sa.sin6_family = all1_sa.sin6_family = AF_INET6;
lo_sa.sin6_len = all1_sa.sin6_len = sizeof(struct sockaddr_in6);
lo_sa.sin6_addr = in6addr_loopback;
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);
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.
*/
/*
* 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 removing
* a subnet-router anycast address on an interface attahced
* to a shared medium.
*/
rt = rtalloc1(ifa->ifa_addr, 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_mask2len(mask, lim0)
struct in6_addr *mask;
u_char *lim0;
{
int x = 0, y;
u_char *lim = lim0, *p;
/* ignore the scope_id part */
if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
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;
}
#define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
#define ia62ifa(ia6) (&((ia6)->ia_ifa))
int
in6_control(so, cmd, data, ifp, p)
struct socket *so;
u_long cmd;
caddr_t data;
struct ifnet *ifp;
struct proc *p;
{
struct in6_ifreq *ifr = (struct in6_ifreq *)data;
struct in6_ifaddr *ia = NULL;
struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
struct sockaddr_in6 *sa6;
int privileged;
privileged = 0;
if (p && !suser(p->p_ucred, &p->p_acflag))
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);
/* FALLTHROUGH */
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 SIOCALIFADDR:
case SIOCDLIFADDR:
if (!privileged)
return (EPERM);
/* FALLTHROUGH */
case SIOCGLIFADDR:
return in6_lifaddr_ioctl(so, cmd, data, ifp, p);
}
/*
* Find address for this interface, if it exists.
*
* In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
* only, and used the first interface address as the target of other
* operations (without checking ifra_addr). This was because netinet
* code/API assumed at most 1 interface address per interface.
* Since IPv6 allows a node to assign multiple addresses
* on a single interface, we almost always look and check the
* presence of ifra_addr, and reject invalid ones here.
* It also decreases duplicated code among SIOC*_IN6 operations.
*/
switch (cmd) {
case SIOCAIFADDR_IN6:
case SIOCSIFPHYADDR_IN6:
sa6 = &ifra->ifra_addr;
break;
case SIOCSIFADDR_IN6:
case SIOCGIFADDR_IN6:
case SIOCSIFDSTADDR_IN6:
case SIOCSIFNETMASK_IN6:
case SIOCGIFDSTADDR_IN6:
case SIOCGIFNETMASK_IN6:
case SIOCDIFADDR_IN6:
case SIOCGIFPSRCADDR_IN6:
case SIOCGIFPDSTADDR_IN6:
case SIOCGIFAFLAG_IN6:
case SIOCSNDFLUSH_IN6:
case SIOCSPFXFLUSH_IN6:
case SIOCSRTRFLUSH_IN6:
case SIOCGIFALIFETIME_IN6:
case SIOCSIFALIFETIME_IN6:
case SIOCGIFSTAT_IN6:
case SIOCGIFSTAT_ICMP6:
sa6 = &ifr->ifr_addr;
break;
default:
sa6 = NULL;
break;
}
if (sa6 && sa6->sin6_family == AF_INET6) {
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, &sa6->sin6_addr);
} else
ia = NULL;
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 deprecated.
*/
return (EINVAL);
case SIOCDIFADDR_IN6:
/*
* for IPv4, we look for existing in_ifaddr here to allow
* "ifconfig if0 delete" to remove the first IPv4 address on
* the interface. For IPv6, as the spec allows 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. */
/* FALLTHROUGH */
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.tv_sec < time.tv_sec) {
return EINVAL;
}
if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
&& lt->ia6t_pltime + time.tv_sec < time.tv_sec) {
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;
bzero(&ifr->ifr_ifru.ifru_stat,
sizeof(ifr->ifr_ifru.ifru_stat));
ifr->ifr_ifru.ifru_stat =
*((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
break;
case SIOCGIFSTAT_ICMP6:
if (ifp == NULL)
return EINVAL;
bzero(&ifr->ifr_ifru.ifru_stat,
sizeof(ifr->ifr_ifru.ifru_icmp6stat));
ifr->ifr_ifru.ifru_icmp6stat =
*((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
break;
case SIOCGIFALIFETIME_IN6:
ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
time_t maxexpire;
struct in6_addrlifetime *retlt =
&ifr->ifr_ifru.ifru_lifetime;
/*
* XXX: adjust expiration time assuming time_t is
* signed.
*/
maxexpire = (-1) &
~(1 << ((sizeof(maxexpire) * 8) - 1));
if (ia->ia6_lifetime.ia6t_vltime <
maxexpire - ia->ia6_updatetime) {
retlt->ia6t_expire = ia->ia6_updatetime +
ia->ia6_lifetime.ia6t_vltime;
} else
retlt->ia6t_expire = maxexpire;
}
if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
time_t maxexpire;
struct in6_addrlifetime *retlt =
&ifr->ifr_ifru.ifru_lifetime;
/*
* XXX: adjust expiration time assuming time_t is
* signed.
*/
maxexpire = (-1) &
~(1 << ((sizeof(maxexpire) * 8) - 1));
if (ia->ia6_lifetime.ia6t_pltime <
maxexpire - ia->ia6_updatetime) {
retlt->ia6t_preferred = ia->ia6_updatetime +
ia->ia6_lifetime.ia6t_pltime;
} else
retlt->ia6t_preferred = maxexpire;
}
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.tv_sec + 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.tv_sec + 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;
/* reject read-only flags */
if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 ||
(ifra->ifra_flags & IN6_IFF_DETACHED) != 0 ||
(ifra->ifra_flags & IN6_IFF_NODAD) != 0 ||
(ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0) {
return (EINVAL);
}
/*
* 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);
if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
== NULL) {
/*
* this can happen when the user specify the 0 valid
* lifetime.
*/
break;
}
/*
* 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 an API to set prefix (not address)
* lifetimes, we just use the same lifetimes as addresses.
* The (temporarily) installed lifetimes can be overridden by
* later advertised RAs (when accept_rtadv is non 0), which is
* an intended 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 not yet. */
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 succeeded but "
"no prefix\n");
return (EINVAL); /* XXX panic here? */
}
}
/* relate the address to the prefix */
if (ia->ia6_ndpr == NULL) {
ia->ia6_ndpr = pr;
pr->ndpr_refcnt++;
}
/*
* this might affect the status of autoconfigured addresses,
* that is, this address might make other addresses detached.
*/
pfxlist_onlink_check();
#ifdef PFIL_HOOKS
(void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCAIFADDR_IN6,
ifp, PFIL_IFADDR);
#endif
break;
}
case SIOCDIFADDR_IN6:
{
int i = 0, purgeprefix = 0;
struct nd_prefix pr0, *pr = NULL;
/*
* 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 worry 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];
}
if ((pr = nd6_prefix_lookup(&pr0)) != NULL &&
pr == ia->ia6_ndpr) {
pr->ndpr_refcnt--;
if (pr->ndpr_refcnt == 0)
purgeprefix = 1;
}
purgeaddr:
in6_purgeaddr(&ia->ia_ifa);
if (pr && purgeprefix)
prelist_remove(pr);
#ifdef PFIL_HOOKS
(void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCDIFADDR_IN6,
ifp, PFIL_IFADDR);
#endif
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;
struct in6_multi_mship *imm;
struct rtentry *rt;
/* 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)) != 0 &&
(dst6.sin6_family == AF_INET6)) {
/* link-local index check: should be a separate function? */
if (IN6_IS_ADDR_LINKLOCAL(&dst6.sin6_addr)) {
if (dst6.sin6_addr.s6_addr16[1] == 0) {
/*
* interface ID is not embedded by
* the user
*/
dst6.sin6_addr.s6_addr16[1] =
htons(ifp->if_index);
} else if (dst6.sin6_addr.s6_addr16[1] !=
htons(ifp->if_index)) {
return (EINVAL); /* ifid contradicts */
}
}
}
/*
* 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) {
#ifdef FORCE_P2PPLEN
int i;
#endif
if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
/* XXX: noisy message */
nd6log((LOG_INFO, "in6_update_ifa: a destination can "
"be specified for a p2p or a loopback IF only\n"));
return (EINVAL);
}
if (plen != 128) {
nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
"be 128 when dstaddr is specified\n"));
#ifdef FORCE_P2PPLEN
/*
* To be compatible with old configurations,
* such as ifconfig gif0 inet6 2001::1 2001::2
* prefixlen 126, we override the specified
* prefixmask as if the prefix length was 128.
*/
ifra->ifra_prefixmask.sin6_len =
sizeof(struct sockaddr_in6);
for (i = 0; i < 4; i++)
ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] =
0xffffffff;
plen = 128;
#else
return (EINVAL);
#endif
}
}
/* lifetime consistency check */
lt = &ifra->ifra_lifetime;
if (lt->ia6t_pltime > lt->ia6t_vltime)
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.
*/
nd6log((LOG_INFO,
"in6_update_ifa: valid lifetime is 0 for %s\n",
ip6_sprintf(&ifra->ifra_addr.sin6_addr)));
if (ia == NULL)
return (0); /* there's nothing to do */
}
/*
* 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 an interrupt context. 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));
LIST_INIT(&ia->ia6_memberships);
/* Initialize the address and masks, and put time stamp */
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);
ia->ia6_createtime = ia->ia6_updatetime = time.tv_sec;
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;
/* gain a refcnt for the link from in6_ifaddr */
IFAREF(&ia->ia_ifa);
TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa,
ifa_list);
/* gain another refcnt for the link from if_addrlist */
IFAREF(&ia->ia_ifa);
}
/* 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) {
nd6log((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)) {
if ((ia->ia_flags & IFA_ROUTE) != 0 &&
rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0) {
nd6log((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;
}
/*
* Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
* to see if the address is deprecated or invalidated, but initialize
* these members for applications.
*/
ia->ia6_lifetime = ifra->ifra_lifetime;
if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
ia->ia6_lifetime.ia6t_expire =
time.tv_sec + 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.tv_sec + ia->ia6_lifetime.ia6t_pltime;
} else
ia->ia6_lifetime.ia6t_preferred = 0;
/* reset the interface and routing table appropriately. */
if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
goto unlink;
/*
* configure address flags.
*/
ia->ia6_flags = ifra->ifra_flags;
/*
* backward compatibility - if IN6_IFF_DEPRECATED is set from the
* userland, make it deprecated.
*/
if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
ia->ia6_lifetime.ia6t_pltime = 0;
ia->ia6_lifetime.ia6t_preferred = time.tv_sec;
}
/*
* Make the address tentative before joining multicast addresses,
* so that corresponding MLD responses would not have a tentative
* source address.
*/
ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
if (hostIsNew && in6if_do_dad(ifp))
ia->ia6_flags |= IN6_IFF_TENTATIVE;
/*
* We are done if we have simply modified an existing address.
*/
if (!hostIsNew)
return (error);
/*
* Beyond this point, we should call in6_purgeaddr upon an error,
* not just go to unlink.
*/
/* join necessary multiast groups */
if ((ifp->if_flags & IFF_MULTICAST) != 0) {
struct sockaddr_in6 mltaddr, mltmask;
#ifndef SCOPEDROUTING
u_int32_t zoneid = 0;
#endif
/* join solicited multicast addr for new host id */
struct sockaddr_in6 llsol;
bzero(&llsol, sizeof(llsol));
llsol.sin6_family = AF_INET6;
llsol.sin6_len = sizeof(llsol);
llsol.sin6_addr.s6_addr16[0] = htons(0xff02);
llsol.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
llsol.sin6_addr.s6_addr32[1] = 0;
llsol.sin6_addr.s6_addr32[2] = htonl(1);
llsol.sin6_addr.s6_addr32[3] =
ifra->ifra_addr.sin6_addr.s6_addr32[3];
llsol.sin6_addr.s6_addr8[12] = 0xff;
imm = in6_joingroup(ifp, &llsol.sin6_addr, &error);
if (!imm) {
nd6log((LOG_ERR,
"in6_update_ifa: addmulti "
"failed for %s on %s (errno=%d)\n",
ip6_sprintf(&llsol.sin6_addr),
if_name(ifp), error));
goto cleanup;
}
LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
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);
/*
* XXX: do we really need this automatic routes?
* We should probably reconsider this stuff. Most applications
* actually do not need the routes, since they usually specify
* the outgoing interface.
*/
rt = rtalloc1((struct sockaddr *)&mltaddr, 0);
if (rt) {
/*
* 32bit came from "mltmask"
* XXX: only works in !SCOPEDROUTING case.
*/
if (memcmp(&mltaddr.sin6_addr,
&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
32 / 8)) {
RTFREE(rt);
rt = NULL;
}
}
if (!rt) {
struct rt_addrinfo info;
bzero(&info, sizeof(info));
info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr;
info.rti_info[RTAX_GATEWAY] =
(struct sockaddr *)&ia->ia_addr;
info.rti_info[RTAX_NETMASK] =
(struct sockaddr *)&mltmask;
info.rti_info[RTAX_IFA] =
(struct sockaddr *)&ia->ia_addr;
/* XXX: we need RTF_CLONING to fake nd6_rtrequest */
info.rti_flags = RTF_UP | RTF_CLONING;
error = rtrequest1(RTM_ADD, &info, NULL);
if (error)
goto cleanup;
} else {
RTFREE(rt);
}
#ifndef SCOPEDROUTING
mltaddr.sin6_scope_id = zoneid; /* XXX */
#endif
imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error);
if (!imm) {
nd6log((LOG_WARNING,
"in6_update_ifa: addmulti failed for "
"%s on %s (errno=%d)\n",
ip6_sprintf(&mltaddr.sin6_addr),
if_name(ifp), error));
goto cleanup;
}
LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
/*
* join node information group address
*/
if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) == 0) {
imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error);
if (!imm) {
nd6log((LOG_WARNING, "in6_update_ifa: "
"addmulti failed for %s on %s (errno=%d)\n",
ip6_sprintf(&mltaddr.sin6_addr),
if_name(ifp), error));
/* XXX not very fatal, go on... */
} else {
LIST_INSERT_HEAD(&ia->ia6_memberships,
imm, i6mm_chain);
}
}
if (ifp->if_flags & IFF_LOOPBACK) {
/*
* join node-local all-nodes address, on loopback.
* (ff01::1%ifN, and ff01::%ifN/32)
*/
mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
/* XXX: again, do we really need the route? */
rt = rtalloc1((struct sockaddr *)&mltaddr, 0);
if (rt) {
/* 32bit came from "mltmask" */
if (memcmp(&mltaddr.sin6_addr,
&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
32 / 8)) {
RTFREE(rt);
rt = NULL;
}
}
if (!rt) {
struct rt_addrinfo info;
bzero(&info, sizeof(info));
info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr;
info.rti_info[RTAX_GATEWAY] =
(struct sockaddr *)&ia->ia_addr;
info.rti_info[RTAX_NETMASK] =
(struct sockaddr *)&mltmask;
info.rti_info[RTAX_IFA] =
(struct sockaddr *)&ia->ia_addr;
info.rti_flags = RTF_UP | RTF_CLONING;
error = rtrequest1(RTM_ADD, &info, NULL);
if (error)
goto cleanup;
} else {
RTFREE(rt);
}
imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error);
if (!imm) {
nd6log((LOG_WARNING, "in6_update_ifa: "
"addmulti failed for %s on %s (errno=%d)\n",
ip6_sprintf(&mltaddr.sin6_addr),
if_name(ifp), error));
goto cleanup;
}
LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
}
}
/*
* Perform DAD, if needed.
* XXX It may be of use, if we can administratively
* disable DAD.
*/
if (hostIsNew && in6if_do_dad(ifp) &&
(ifra->ifra_flags & IN6_IFF_NODAD) == 0)
{
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);
cleanup:
in6_purgeaddr(&ia->ia_ifa);
return error;
}
void
in6_purgeaddr(ifa)
struct ifaddr *ifa;
{
struct ifnet *ifp = ifa->ifa_ifp;
struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
struct in6_multi_mship *imm;
/* 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));
/*
* leave from multicast groups we have joined for the interface
*/
while ((imm = ia->ia6_memberships.lh_first) != NULL) {
LIST_REMOVE(imm, i6mm_chain);
in6_leavegroup(imm);
}
in6_unlink_ifa(ia, ifp);
}
static void
in6_unlink_ifa(ia, ifp)
struct in6_ifaddr *ia;
struct ifnet *ifp;
{
struct in6_ifaddr *oia;
int s = splnet();
TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
/* release a refcnt for the link from if_addrlist */
IFAFREE(&ia->ia_ifa);
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_multiaddrs.lh_first != NULL) {
/*
* XXX thorpej@NetBSD.org -- if the interface is going
* XXX away, don't save the multicast entries, delete them!
*/
if (oia->ia_ifa.ifa_ifp->if_output == if_nulloutput) {
struct in6_multi *in6m;
while ((in6m =
LIST_FIRST(&oia->ia6_multiaddrs)) != NULL)
in6_delmulti(in6m);
} else
in6_savemkludge(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, p)
struct socket *so;
u_long cmd;
caddr_t data;
struct ifnet *ifp;
struct proc *p;
{
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");
/* NOTREACHED */
}
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_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, p);
}
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_prefixlen2mask(&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_prefixlen2mask(&mask, 128);
sin6 = (struct sockaddr_in6 *)&iflr->addr;
bcopy(&sin6->sin6_addr, &match, sizeof(match));
cmp = 1;
}
}
for (ifa = ifp->if_addrlist.tqh_first;
ifa;
ifa = ifa->ifa_list.tqe_next)
{
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (!cmp)
break;
bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
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) {
/* fill in the if_laddrreq structure */
bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
ia->ia_dstaddr.sin6_len);
} 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, p);
}
}
}
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 = splnet();
struct ifaddr *ifa;
/*
* Give the interface a chance to initialize
* if this is its first address,
* and to validate the address if necessary.
*/
for (ifa = ifp->if_addrlist.tqh_first; ifa;
ifa = ifa->ifa_list.tqe_next)
{
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;
}
/* 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));
}
if (ifp->if_flags & IFF_MULTICAST)
in6_restoremkludge(ia, ifp);
return (error);
}
/*
* Multicast address kludge:
* If there were any multicast addresses attached to this interface address,
* either move them to another address on this interface, or save them until
* such time as this interface is reconfigured for IPv6.
*/
void
in6_savemkludge(oia)
struct in6_ifaddr *oia;
{
struct in6_ifaddr *ia;
struct in6_multi *in6m, *next;
IFP_TO_IA6(oia->ia_ifp, ia);
if (ia) { /* there is another address */
for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next){
next = in6m->in6m_entry.le_next;
IFAFREE(&in6m->in6m_ia->ia_ifa);
IFAREF(&ia->ia_ifa);
in6m->in6m_ia = ia;
LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
}
} else { /* last address on this if deleted, save */
struct multi6_kludge *mk;
for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
if (mk->mk_ifp == oia->ia_ifp)
break;
}
if (mk == NULL) /* this should not happen! */
panic("in6_savemkludge: no kludge space");
for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next){
next = in6m->in6m_entry.le_next;
IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
in6m->in6m_ia = NULL;
LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry);
}
}
}
/*
* Continuation of multicast address hack:
* If there was a multicast group list previously saved for this interface,
* then we re-attach it to the first address configured on the i/f.
*/
void
in6_restoremkludge(ia, ifp)
struct in6_ifaddr *ia;
struct ifnet *ifp;
{
struct multi6_kludge *mk;
for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
if (mk->mk_ifp == ifp) {
struct in6_multi *in6m, *next;
for (in6m = mk->mk_head.lh_first; in6m; in6m = next) {
next = in6m->in6m_entry.le_next;
in6m->in6m_ia = ia;
IFAREF(&ia->ia_ifa);
LIST_INSERT_HEAD(&ia->ia6_multiaddrs,
in6m, in6m_entry);
}
LIST_INIT(&mk->mk_head);
break;
}
}
}
/*
* Allocate space for the kludge at interface initialization time.
* Formerly, we dynamically allocated the space in in6_savemkludge() with
* malloc(M_WAITOK). However, it was wrong since the function could be called
* under an interrupt context (software timer on address lifetime expiration).
* Also, we cannot just give up allocating the strucutre, since the group
* membership structure is very complex and we need to keep it anyway.
* Of course, this function MUST NOT be called under an interrupt context.
* Specifically, it is expected to be called only from in6_ifattach(), though
* it is a global function.
*/
void
in6_createmkludge(ifp)
struct ifnet *ifp;
{
struct multi6_kludge *mk;
for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
/* If we've already had one, do not allocate. */
if (mk->mk_ifp == ifp)
return;
}
mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK);
bzero(mk, sizeof(*mk));
LIST_INIT(&mk->mk_head);
mk->mk_ifp = ifp;
LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
}
void
in6_purgemkludge(ifp)
struct ifnet *ifp;
{
struct multi6_kludge *mk;
struct in6_multi *in6m;
for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
if (mk->mk_ifp != ifp)
continue;
/* leave from all multicast groups joined */
while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL)
in6_delmulti(in6m);
LIST_REMOVE(mk, mk_entry);
free(mk, M_IPMADDR);
break;
}
}
/*
* 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_ifaddr *ia;
struct in6_ifreq ifr;
struct in6_multi *in6m;
int s = splsoftnet();
*errorp = 0;
/*
* See if address already in list.
*/
IN6_LOOKUP_MULTI(*maddr6, ifp, in6m);
if (in6m != NULL) {
/*
* Found it; just increment the refrence count.
*/
in6m->in6m_refcount++;
} else {
/*
* New address; allocate a new multicast record
* and link it into the interface's multicast list.
*/
in6m = (struct in6_multi *)
malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT);
if (in6m == NULL) {
splx(s);
*errorp = ENOBUFS;
return (NULL);
}
in6m->in6m_addr = *maddr6;
in6m->in6m_ifp = ifp;
in6m->in6m_refcount = 1;
IFP_TO_IA6(ifp, ia);
if (ia == NULL) {
free(in6m, M_IPMADDR);
splx(s);
*errorp = EADDRNOTAVAIL; /* appropriate? */
return (NULL);
}
in6m->in6m_ia = ia;
IFAREF(&ia->ia_ifa); /* gain a reference */
LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
/*
* Ask the network driver to update its multicast reception
* filter appropriately for the new address.
*/
bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6));
ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
ifr.ifr_addr.sin6_family = AF_INET6;
ifr.ifr_addr.sin6_addr = *maddr6;
if (ifp->if_ioctl == NULL)
*errorp = ENXIO; /* XXX: appropriate? */
else
*errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI,
(caddr_t)&ifr);
if (*errorp) {
LIST_REMOVE(in6m, in6m_entry);
free(in6m, M_IPMADDR);
IFAFREE(&ia->ia_ifa);
splx(s);
return (NULL);
}
/*
* 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 in6_ifreq ifr;
struct in6_ifaddr *ia;
int s = splsoftnet();
if (--in6m->in6m_refcount == 0) {
/*
* No remaining claims to this record; let MLD6 know
* that we are leaving the multicast group.
*/
mld6_stop_listening(in6m);
/*
* Unlink from list.
*/
LIST_REMOVE(in6m, in6m_entry);
if (in6m->in6m_ia) {
IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
}
/*
* Delete all references of this multicasting group from
* the membership arrays
*/
for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
struct in6_multi_mship *imm;
LIST_FOREACH(imm, &ia->ia6_memberships,
i6mm_chain) {
if (imm->i6mm_maddr == in6m)
imm->i6mm_maddr = NULL;
}
}
/*
* Notify the network driver to update its multicast
* reception filter.
*/
bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6));
ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
ifr.ifr_addr.sin6_family = AF_INET6;
ifr.ifr_addr.sin6_addr = in6m->in6m_addr;
(*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp,
SIOCDELMULTI, (caddr_t)&ifr);
free(in6m, M_IPMADDR);
}
splx(s);
}
struct in6_multi_mship *
in6_joingroup(ifp, addr, errorp)
struct ifnet *ifp;
struct in6_addr *addr;
int *errorp;
{
struct in6_multi_mship *imm;
imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT);
if (!imm) {
*errorp = ENOBUFS;
return NULL;
}
imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp);
if (!imm->i6mm_maddr) {
/* *errorp is alrady set */
free(imm, M_IPMADDR);
return NULL;
}
return imm;
}
int
in6_leavegroup(imm)
struct in6_multi_mship *imm;
{
if (imm->i6mm_maddr)
in6_delmulti(imm->i6mm_maddr);
free(imm, M_IPMADDR);
return 0;
}
/*
* 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;
for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next)
{
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;
for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next)
{
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;
const u_int16_t *a = (const u_int16_t *)addr;
const u_int8_t *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 = (const 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]);
}
/*
* Determine if an address is on a local network.
*/
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);
}
/*
* Get a scope of the address. Node-local, link-local, site-local or global.
*/
int
in6_addrscope (addr)
struct in6_addr *addr;
{
int scope;
if (addr->s6_addr8[0] == 0xfe) {
scope = addr->s6_addr8[1] & 0xc0;
switch (scope) {
case 0x80:
return IPV6_ADDR_SCOPE_LINKLOCAL;
case 0xc0:
return IPV6_ADDR_SCOPE_SITELOCAL;
default:
return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
}
}
if (addr->s6_addr8[0] == 0xff) {
scope = addr->s6_addr8[1] & 0x0f;
/*
* due to other scope such as reserved,
* return scope doesn't work.
*/
switch (scope) {
case IPV6_ADDR_SCOPE_NODELOCAL:
return IPV6_ADDR_SCOPE_NODELOCAL;
case IPV6_ADDR_SCOPE_LINKLOCAL:
return IPV6_ADDR_SCOPE_LINKLOCAL;
case IPV6_ADDR_SCOPE_SITELOCAL:
return IPV6_ADDR_SCOPE_SITELOCAL;
default:
return IPV6_ADDR_SCOPE_GLOBAL;
}
}
if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) {
if (addr->s6_addr8[15] == 1) /* loopback */
return IPV6_ADDR_SCOPE_NODELOCAL;
if (addr->s6_addr8[15] == 0) /* unspecified */
return IPV6_ADDR_SCOPE_LINKLOCAL;
}
return IPV6_ADDR_SCOPE_GLOBAL;
}
int
in6_addr2scopeid(ifp, addr)
struct ifnet *ifp; /* must not be NULL */
struct in6_addr *addr; /* must not be NULL */
{
int scope = in6_addrscope(addr);
switch (scope) {
case IPV6_ADDR_SCOPE_NODELOCAL:
return (-1); /* XXX: is this an appropriate value? */
case IPV6_ADDR_SCOPE_LINKLOCAL:
/* XXX: we do not distinguish between a link and an I/F. */
return (ifp->if_index);
case IPV6_ADDR_SCOPE_SITELOCAL:
return (0); /* XXX: invalid. */
default:
return (0); /* XXX: treat as global. */
}
}
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 (bitlen != 0 &&
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;
{
static const 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) {
printf("in6_ifawithscope: output interface is not specified\n");
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;
for (ifa = ifp->if_addrlist.tqh_first; ifa;
ifa = ifa->ifa_list.tqe_next)
{
int tlen = -1, dscopecmp, bscopecmp, matchcmp;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
src_scope = in6_addrscope(IFA_IN6(ifa));
#ifdef ADDRSELECT_DEBUG /* should be removed after stabilization */
dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope);
printf("in6_ifawithscope: dst=%s bestaddr=%s, "
"newaddr=%s, scope=%x, dcmp=%d, bcmp=%d, "
"matchlen=%d, flgs=%x\n",
ip6_sprintf(dst),
ifa_best ? ip6_sprintf(&ifa_best->ia_addr.sin6_addr) : "none",
ip6_sprintf(IFA_IN6(ifa)), src_scope,
dscopecmp,
ifa_best ? IN6_ARE_SCOPE_CMP(src_scope, best_scope) : -1,
in6_matchlen(IFA_IN6(ifa), dst),
((struct in6_ifaddr *)ifa)->ia6_flags);
#endif
/*
* 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.
*/
if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 &&
IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0)
goto replace;
if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 &&
IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0)
continue;
/*
* 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.
*/
if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) &&
(((struct in6_ifaddr *)ifa)->ia6_flags &
IN6_IFF_DEPRECATED) == 0)
goto replace;
/*
* 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.
* - Longest address match against dst is considered
* only for addresses that has the same scope of dst.
* - If there is no other reasons to choose one,
* addresses on the outgoing I/F are preferred.
*
* The precise decision table is as follows:
* dscopecmp bscopecmp matchcmp outI/F | replace?
* !equal equal N/A Yes | Yes (1)
* !equal equal N/A No | No (2)
* larger larger N/A N/A | No (3)
* larger smaller N/A N/A | Yes (4)
* smaller larger N/A N/A | Yes (5)
* smaller smaller N/A N/A | No (6)
* equal smaller N/A N/A | Yes (7)
* equal larger (already done)
* equal equal larger N/A | Yes (8)
* equal equal smaller N/A | No (9)
* equal equal equal Yes | Yes (a)
* eaual eqaul equal No | No (b)
*/
dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope);
bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope);
if (dscopecmp && bscopecmp == 0) {
if (oifp == ifp) /* (1) */
goto replace;
continue; /* (2) */
}
if (dscopecmp > 0) {
if (bscopecmp > 0) /* (3) */
continue;
goto replace; /* (4) */
}
if (dscopecmp < 0) {
if (bscopecmp > 0) /* (5) */
goto replace;
continue; /* (6) */
}
/* now dscopecmp must be 0 */
if (bscopecmp < 0)
goto replace; /* (7) */
/*
* At last both dscopecmp and bscopecmp must be 0.
* We need address matching against dst for
* tiebreaking.
*/
tlen = in6_matchlen(IFA_IN6(ifa), dst);
matchcmp = tlen - blen;
if (matchcmp > 0) /* (8) */
goto replace;
if (matchcmp < 0) /* (9) */
continue;
if (oifp == ifp) /* (a) */
goto replace;
continue; /* (b) */
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.
*/
for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next)
{
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);
for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next)
{
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;
for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next)
{
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) {
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))
{
/* this function can be called during ifnet initialization */
if (!ifp->if_afdata[AF_INET6])
continue;
if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
IN6_LINKMTU(ifp) > maxmtu)
maxmtu = IN6_LINKMTU(ifp);
}
if (maxmtu) /* update only when maxmtu is positive */
in6_maxmtu = maxmtu;
}
void *
in6_domifattach(ifp)
struct ifnet *ifp;
{
struct in6_ifextra *ext;
ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
bzero(ext, sizeof(*ext));
ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
M_IFADDR, M_WAITOK);
bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
ext->icmp6_ifstat =
(struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
M_IFADDR, M_WAITOK);
bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
ext->nd_ifinfo = nd6_ifattach(ifp);
return ext;
}
void
in6_domifdetach(ifp, aux)
struct ifnet *ifp;
void *aux;
{
struct in6_ifextra *ext = (struct in6_ifextra *)aux;
nd6_ifdetach(ext->nd_ifinfo);
free(ext->in6_ifstat, M_IFADDR);
free(ext->icmp6_ifstat, M_IFADDR);
free(ext, M_IFADDR);
}
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