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freebsd-dev/sys/netinet6/in6.c
Sam Leffler d1dd20be6e Locking for updates to routing table entries. Each rtentry gets a mutex 
that covers updates to the contents.  Note this is separate from holding
a reference and/or locking the routing table itself.

Other/related changes:

o rtredirect loses the final parameter by which an rtentry reference
  may be returned; this was never used and added unwarranted complexity
  for locking.
o minor style cleanups to routing code (e.g. ansi-fy function decls)
o remove the logic to bump the refcnt on the parent of cloned routes,
  we assume the parent will remain as long as the clone; doing this avoids
  a circularity in locking during delete
o convert some timeouts to MPSAFE callouts

Notes:

1. rt_mtx in struct rtentry is guarded by #ifdef _KERNEL as user-level
   applications cannot/do-no know about mutex's.  Doing this requires
   that the mutex be the last element in the structure.  A better solution
   is to introduce an externalized version of struct rtentry but this is
   a major task because of the intertwining of rtentry and other data
   structures that are visible to user applications.
2. There are known LOR's that are expected to go away with forthcoming
   work to eliminate many held references.  If not these will be resolved
   prior to release.
3. ATM changes are untested.

Sponsored by:	FreeBSD Foundation
Obtained from:	BSD/OS (partly)
2003-10-04 03:44:50 +00:00

2462 lines
65 KiB
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/* $FreeBSD$ */
/* $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi 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 <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 <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);
}
if (nrt) {
RT_LOCK(nrt);
/*
* 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 && 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?
*/
rt_newaddrmsg(cmd, ifa, e, nrt);
if (cmd == RTM_DELETE) {
rtfree(nrt);
} else {
/* the cmd must be RTM_ADD here */
nrt->rt_refcnt--;
RT_UNLOCK(nrt);
}
}
}
/*
* 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)
rtfree(rt);
}
/*
* 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) {
if ((rt->rt_flags & RTF_HOST) != 0 &&
(rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
rtfree(rt);
in6_ifloop_request(RTM_DELETE, ifa);
} else
RT_UNLOCK(rt);
}
}
}
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))
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 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 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 */
IFA_LOCK_INIT(&ia->ia_ifa);
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;
ia->ia_ifa.ifa_refcnt = 1;
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;
const u_short *a = (const u_short *)addr;
const 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 = (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]);
}
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.
*/
IFNET_RLOCK();
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);
}
}
IFNET_RUNLOCK();
/* 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;
IFNET_RLOCK();
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;
}
IFNET_RUNLOCK();
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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