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freebsd/sys/netinet6/in6.c
Shivank Garg 215bab7924 mac_ipacl: new MAC policy module to limit jail/vnet IP configuration 
The mac_ipacl policy module enables fine-grained control over IP address
configuration within VNET jails from the base system.
It allows the root user to define rules governing IP addresses for
jails and their interfaces using the sysctl interface.

Requested by:	multiple
Sponsored by:	Google, Inc. (GSoC 2019)
MFC after:	2 months
Reviewed by:	bz, dch (both earlier versions)
Differential Revision: https://reviews.freebsd.org/D20967
2023-07-26 00:07:57 +00:00

2771 lines
71 KiB
C
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*
* $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
*/
/*-
* 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>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/eventhandler.h>
#include <sys/errno.h>
#include <sys/jail.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/systm.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/rmlock.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_private.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/route/route_ctl.h>
#include <net/route/nhop.h>
#include <net/if_dl.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <net/if_llatbl.h>
#include <netinet/if_ether.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_carp.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 <netinet6/scope6_var.h>
#include <netinet6/in6_fib.h>
#include <netinet6/in6_pcb.h>
#ifdef MAC
#include <security/mac/mac_framework.h>
#endif
/*
* struct in6_ifreq and struct ifreq must be type punnable for common members
* of ifr_ifru to allow accessors to be shared.
*/
_Static_assert(offsetof(struct in6_ifreq, ifr_ifru) ==
offsetof(struct ifreq, ifr_ifru),
"struct in6_ifreq and struct ifreq are not type punnable");
VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
#define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix)
/*
* 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 in6addr_linklocal_allv2routers =
IN6ADDR_LINKLOCAL_ALLV2ROUTERS_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_notify_ifa(struct ifnet *, struct in6_ifaddr *,
struct in6_aliasreq *, int);
static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
struct in6_ifaddr *, int);
static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
struct in6_aliasreq *, int flags);
static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
struct in6_ifaddr *, int, int);
static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *,
struct in6_ifaddr *, int);
static void in6_join_proxy_ndp_mc(struct ifnet *, const struct in6_addr *);
static void in6_leave_proxy_ndp_mc(struct ifnet *, const struct in6_addr *);
#define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
#define ia62ifa(ia6) (&((ia6)->ia_ifa))
static struct sx in6_control_sx;
SX_SYSINIT(in6_control_sx, &in6_control_sx, "in6_control");
void
in6_newaddrmsg(struct in6_ifaddr *ia, int cmd)
{
struct rt_addrinfo info;
struct ifaddr *ifa;
struct sockaddr_dl gateway;
int fibnum;
ifa = &ia->ia_ifa;
/*
* Prepare info data for the host route.
* This code mimics one from ifa_maintain_loopback_route().
*/
bzero(&info, sizeof(struct rt_addrinfo));
info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED;
info.rti_info[RTAX_DST] = ifa->ifa_addr;
info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gateway;
link_init_sdl(ifa->ifa_ifp, (struct sockaddr *)&gateway, ifa->ifa_ifp->if_type);
if (cmd != RTM_DELETE)
info.rti_ifp = V_loif;
fibnum = ia62ifa(ia)->ifa_ifp->if_fib;
if (cmd == RTM_ADD) {
rt_addrmsg(cmd, &ia->ia_ifa, fibnum);
rt_routemsg_info(cmd, &info, fibnum);
} else if (cmd == RTM_DELETE) {
rt_routemsg_info(cmd, &info, fibnum);
rt_addrmsg(cmd, &ia->ia_ifa, fibnum);
}
}
int
in6_mask2len(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;
}
#ifdef COMPAT_FREEBSD32
struct in6_ndifreq32 {
char ifname[IFNAMSIZ];
uint32_t ifindex;
};
#define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32)
#endif
int
in6_control_ioctl(u_long cmd, void *data,
struct ifnet *ifp, struct ucred *cred)
{
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 error;
bool control_locked = false;
/*
* Compat to make pre-10.x ifconfig(8) operable.
*/
if (cmd == OSIOCAIFADDR_IN6) {
cmd = SIOCAIFADDR_IN6;
ifra->ifra_vhid = 0;
}
switch (cmd) {
case SIOCGETSGCNT_IN6:
case SIOCGETMIFCNT_IN6:
/*
* XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
* We cannot see how that would be needed, so do not adjust the
* KPI blindly; more likely should clean up the IPv4 variant.
*/
return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
}
switch (cmd) {
case SIOCAADDRCTL_POLICY:
case SIOCDADDRCTL_POLICY:
if (cred != NULL) {
error = priv_check_cred(cred, PRIV_NETINET_ADDRCTRL6);
if (error)
return (error);
}
return (in6_src_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:
case SIOCSIFINFO_IN6:
if (cred != NULL) {
error = priv_check_cred(cred, PRIV_NETINET_ND6);
if (error)
return (error);
}
/* FALLTHROUGH */
case OSIOCGIFINFO_IN6:
case SIOCGIFINFO_IN6:
case SIOCGNBRINFO_IN6:
case SIOCGDEFIFACE_IN6:
return (nd6_ioctl(cmd, data, ifp));
#ifdef COMPAT_FREEBSD32
case SIOCGDEFIFACE32_IN6:
{
struct in6_ndifreq ndif;
struct in6_ndifreq32 *ndif32;
error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
ifp);
if (error)
return (error);
ndif32 = (struct in6_ndifreq32 *)data;
ndif32->ifindex = ndif.ifindex;
return (0);
}
#endif
}
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 (cred != NULL) {
error = priv_check_cred(cred, PRIV_NETINET_SCOPE6);
if (error)
return (error);
}
/* FALLTHROUGH */
case SIOCGSCOPE6:
case SIOCGSCOPE6DEF:
return (scope6_ioctl(cmd, data, ifp));
}
/*
* 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 SIOCGIFSTAT_IN6:
case SIOCGIFSTAT_ICMP6:
sa6 = &ifr->ifr_addr;
break;
case SIOCSIFADDR:
case SIOCSIFBRDADDR:
case SIOCSIFDSTADDR:
case SIOCSIFNETMASK:
/*
* Although we should pass any non-INET6 ioctl requests
* down to driver, we filter some legacy INET requests.
* Drivers trust SIOCSIFADDR et al to come from an already
* privileged layer, and do not perform any credentials
* checks or input validation.
*/
return (EINVAL);
default:
sa6 = NULL;
break;
}
if (sa6 && sa6->sin6_family == AF_INET6) {
if (sa6->sin6_scope_id != 0)
error = sa6_embedscope(sa6, 0);
else
error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
if (error != 0)
return (error);
if (cred != NULL && (error = prison_check_ip6(cred,
&sa6->sin6_addr)) != 0)
return (error);
sx_xlock(&in6_control_sx);
control_locked = true;
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.
*/
/* we decided to obsolete this command (20000704) */
error = EINVAL;
goto out;
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) {
error = EADDRNOTAVAIL;
goto out;
}
/* 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)) {
error = EAFNOSUPPORT;
goto out;
}
if (cred != NULL) {
error = priv_check_cred(cred, (cmd == SIOCDIFADDR_IN6) ?
PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
if (error)
goto out;
}
/* FALLTHROUGH */
case SIOCGIFSTAT_IN6:
case SIOCGIFSTAT_ICMP6:
if (ifp->if_afdata[AF_INET6] == NULL) {
error = EPFNOSUPPORT;
goto out;
}
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) {
error = EADDRNOTAVAIL;
goto out;
}
break;
}
switch (cmd) {
case SIOCGIFADDR_IN6:
ifr->ifr_addr = ia->ia_addr;
if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
goto out;
break;
case SIOCGIFDSTADDR_IN6:
if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
error = EINVAL;
goto out;
}
ifr->ifr_dstaddr = ia->ia_dstaddr;
if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
goto out;
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:
COUNTER_ARRAY_COPY(((struct in6_ifextra *)
ifp->if_afdata[AF_INET6])->in6_ifstat,
&ifr->ifr_ifru.ifru_stat,
sizeof(struct in6_ifstat) / sizeof(uint64_t));
break;
case SIOCGIFSTAT_ICMP6:
COUNTER_ARRAY_COPY(((struct in6_ifextra *)
ifp->if_afdata[AF_INET6])->icmp6_ifstat,
&ifr->ifr_ifru.ifru_icmp6stat,
sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
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) &
~((time_t)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) &
~((time_t)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 SIOCAIFADDR_IN6:
#ifdef MAC
/* Check if a MAC policy disallows setting the IPv6 address. */
error = mac_inet6_check_add_addr(cred, &sa6->sin6_addr, ifp);
if (error != 0)
goto out;
#endif
error = in6_addifaddr(ifp, ifra, ia);
ia = NULL;
break;
case SIOCDIFADDR_IN6:
in6_purgeifaddr(ia);
EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
IFADDR_EVENT_DEL);
break;
default:
if (ifp->if_ioctl == NULL) {
error = EOPNOTSUPP;
goto out;
}
error = (*ifp->if_ioctl)(ifp, cmd, data);
goto out;
}
error = 0;
out:
if (control_locked)
sx_xunlock(&in6_control_sx);
if (ia != NULL)
ifa_free(&ia->ia_ifa);
return (error);
}
int
in6_control(struct socket *so, u_long cmd, void *data,
struct ifnet *ifp, struct thread *td)
{
return (in6_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL));
}
static struct in6_multi_mship *
in6_joingroup_legacy(struct ifnet *ifp, const struct in6_addr *mcaddr,
int *errorp, int delay)
{
struct in6_multi_mship *imm;
int error;
imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT);
if (imm == NULL) {
*errorp = ENOBUFS;
return (NULL);
}
delay = (delay * MLD_FASTHZ) / hz;
error = in6_joingroup(ifp, mcaddr, NULL, &imm->i6mm_maddr, delay);
if (error) {
*errorp = error;
free(imm, M_IP6MADDR);
return (NULL);
}
return (imm);
}
static int
in6_solicited_node_maddr(struct in6_addr *maddr,
struct ifnet *ifp, const struct in6_addr *base)
{
int error;
bzero(maddr, sizeof(struct in6_addr));
maddr->s6_addr32[0] = IPV6_ADDR_INT32_MLL;
maddr->s6_addr32[2] = htonl(1);
maddr->s6_addr32[3] = base->s6_addr32[3];
maddr->s6_addr8[12] = 0xff;
if ((error = in6_setscope(maddr, ifp, NULL)) != 0) {
/* XXX: should not happen */
log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
}
return error;
}
/*
* Join necessary multicast groups. Factored out from in6_update_ifa().
* This entire work should only be done once, for the default FIB.
*/
static int
in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
{
char ip6buf[INET6_ADDRSTRLEN];
struct in6_addr mltaddr;
struct in6_multi_mship *imm;
int delay, error;
KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
/* Join solicited multicast addr for new host id. */
if ((error = in6_solicited_node_maddr(&mltaddr, ifp,
&ifra->ifra_addr.sin6_addr)) != 0)
goto cleanup;
delay = error = 0;
if ((flags & IN6_IFAUPDATE_DADDELAY)) {
/*
* We need a random delay for DAD on the address being
* configured. It also means delaying transmission of the
* corresponding MLD report to avoid report collision.
* [RFC 4861, Section 6.3.7]
*/
delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
}
imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay);
if (imm == NULL) {
nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
"(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
if_name(ifp), error));
goto cleanup;
}
LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
*in6m_sol = imm->i6mm_maddr;
/*
* Join link-local all-nodes address.
*/
mltaddr = in6addr_linklocal_allnodes;
if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
goto cleanup; /* XXX: should not fail */
imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0);
if (imm == NULL) {
nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
"(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
if_name(ifp), error));
goto cleanup;
}
LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
/*
* Join node information group address.
*/
delay = 0;
if ((flags & IN6_IFAUPDATE_DADDELAY)) {
/*
* The spec does not say anything about delay for this group,
* but the same logic should apply.
*/
delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
}
if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
/* XXX jinmei */
imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay);
if (imm == NULL)
nd6log((LOG_WARNING,
"%s: in6_joingroup failed for %s on %s "
"(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
&mltaddr), if_name(ifp), error));
/* XXX not very fatal, go on... */
else
LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
}
if (V_icmp6_nodeinfo_oldmcprefix &&
in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay);
if (imm == NULL)
nd6log((LOG_WARNING,
"%s: in6_joingroup failed for %s on %s "
"(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
&mltaddr), if_name(ifp), error));
/* XXX not very fatal, go on... */
else
LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
}
/*
* Join interface-local all-nodes address.
* (ff01::1%ifN, and ff01::%ifN/32)
*/
mltaddr = in6addr_nodelocal_allnodes;
if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
goto cleanup; /* XXX: should not fail */
imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0);
if (imm == NULL) {
nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
"(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
&mltaddr), if_name(ifp), error));
goto cleanup;
}
LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
cleanup:
return (error);
}
/*
* 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().
*/
int
in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
struct in6_ifaddr *ia, int flags)
{
int error, hostIsNew = 0;
if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
return (error);
if (ia == NULL) {
hostIsNew = 1;
if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
return (ENOBUFS);
}
error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
if (error != 0) {
if (hostIsNew != 0) {
in6_unlink_ifa(ia, ifp);
ifa_free(&ia->ia_ifa);
}
return (error);
}
if (hostIsNew)
error = in6_broadcast_ifa(ifp, ifra, ia, flags);
return (error);
}
/*
* Fill in basic IPv6 address request info.
*/
void
in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
const struct in6_addr *mask)
{
memset(ifra, 0, sizeof(struct in6_aliasreq));
ifra->ifra_addr.sin6_family = AF_INET6;
ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
if (addr != NULL)
ifra->ifra_addr.sin6_addr = *addr;
ifra->ifra_prefixmask.sin6_family = AF_INET6;
ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
if (mask != NULL)
ifra->ifra_prefixmask.sin6_addr = *mask;
}
static int
in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
struct in6_ifaddr *ia, int flags)
{
int plen = -1;
struct sockaddr_in6 dst6;
struct in6_addrlifetime *lt;
char ip6buf[INET6_ADDRSTRLEN];
/* 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 address
*/
if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
ifra->ifra_addr.sin6_family != AF_INET6)
return (EINVAL);
/*
* 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)) {
struct in6_addr in6_tmp;
u_int32_t zoneid;
in6_tmp = dst6.sin6_addr;
if (in6_setscope(&in6_tmp, ifp, &zoneid))
return (EINVAL); /* XXX: should be impossible */
if (dst6.sin6_scope_id != 0) {
if (dst6.sin6_scope_id != zoneid)
return (EINVAL);
} else /* user omit to specify the ID. */
dst6.sin6_scope_id = zoneid;
/* convert into the internal form */
if (sa6_embedscope(&dst6, 0))
return (EINVAL); /* XXX: should be impossible */
}
/* Modify original ifra_dstaddr to reflect changes */
ifra->ifra_dstaddr = dst6;
/*
* 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 */
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"));
return (EINVAL);
}
}
/* 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(ip6buf, &ifra->ifra_addr.sin6_addr)));
if (ia == NULL)
return (0); /* there's nothing to do */
}
/* Check prefix mask */
if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
/*
* 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 != 0 &&
in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
"of an existing %s address should not be changed\n",
ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
return (EINVAL);
}
}
return (0);
}
/*
* Allocate a new ifaddr and link it into chains.
*/
static struct in6_ifaddr *
in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
{
struct in6_ifaddr *ia;
/*
* When in6_alloc_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 *)ifa_alloc(sizeof(*ia), M_NOWAIT);
if (ia == NULL)
return (NULL);
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);
/* XXX: Can we assign ,sin6_addr and skip the rest? */
ia->ia_addr = ifra->ifra_addr;
ia->ia6_createtime = time_uptime;
if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
/*
* 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;
}
/* set prefix mask if any */
ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
if (ifra->ifra_prefixmask.sin6_len != 0) {
ia->ia_prefixmask.sin6_family = AF_INET6;
ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
}
ia->ia_ifp = ifp;
ifa_ref(&ia->ia_ifa); /* if_addrhead */
IF_ADDR_WLOCK(ifp);
CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
IF_ADDR_WUNLOCK(ifp);
ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */
IN6_IFADDR_WLOCK();
CK_STAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
CK_LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
IN6_IFADDR_WUNLOCK();
return (ia);
}
/*
* Update/configure interface address parameters:
*
* 1) Update lifetime
* 2) Update interface metric ad flags
* 3) Notify other subsystems
*/
static int
in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
struct in6_ifaddr *ia, int hostIsNew, int flags)
{
int error;
/* update timestamp */
ia->ia6_updatetime = time_uptime;
/*
* 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_uptime + 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_uptime + ia->ia6_lifetime.ia6t_pltime;
} else
ia->ia6_lifetime.ia6t_preferred = 0;
/*
* 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_uptime;
}
/*
* configure address flags.
*/
ia->ia6_flags = ifra->ifra_flags;
/*
* 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 */
/*
* DAD should be performed for an new address or addresses on
* an interface with ND6_IFF_IFDISABLED.
*/
if (in6if_do_dad(ifp) &&
(hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
ia->ia6_flags |= IN6_IFF_TENTATIVE;
/* notify other subsystems */
error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
return (error);
}
/*
* Do link-level ifa job:
* 1) Add lle entry for added address
* 2) Notifies routing socket users about new address
* 3) join appropriate multicast group
* 4) start DAD if enabled
*/
static int
in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
struct in6_ifaddr *ia, int flags)
{
struct in6_multi *in6m_sol;
int error = 0;
/* Add local address to lltable, if necessary (ex. on p2p link). */
if ((error = nd6_add_ifa_lle(ia)) != 0) {
in6_purgeaddr(&ia->ia_ifa);
ifa_free(&ia->ia_ifa);
return (error);
}
/* Join necessary multicast groups. */
in6m_sol = NULL;
if ((ifp->if_flags & IFF_MULTICAST) != 0) {
error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
if (error != 0) {
in6_purgeaddr(&ia->ia_ifa);
ifa_free(&ia->ia_ifa);
return (error);
}
}
/* Perform DAD, if the address is TENTATIVE. */
if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
int delay, mindelay, maxdelay;
delay = 0;
if ((flags & IN6_IFAUPDATE_DADDELAY)) {
/*
* We need to impose a delay before sending an NS
* for DAD. Check if we also needed a delay for the
* corresponding MLD message. If we did, the delay
* should be larger than the MLD delay (this could be
* relaxed a bit, but this simple logic is at least
* safe).
* XXX: Break data hiding guidelines and look at
* state for the solicited multicast group.
*/
mindelay = 0;
if (in6m_sol != NULL &&
in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
mindelay = in6m_sol->in6m_timer;
}
maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
if (maxdelay - mindelay == 0)
delay = 0;
else {
delay =
(arc4random() % (maxdelay - mindelay)) +
mindelay;
}
}
nd6_dad_start((struct ifaddr *)ia, delay);
}
in6_newaddrmsg(ia, RTM_ADD);
ifa_free(&ia->ia_ifa);
return (error);
}
/*
* Adds or deletes interface route for p2p ifa.
* Returns 0 on success or errno.
*/
static int
in6_handle_dstaddr_rtrequest(int cmd, struct in6_ifaddr *ia)
{
struct epoch_tracker et;
struct ifaddr *ifa = &ia->ia_ifa;
int error;
/* Prepare gateway */
struct sockaddr_dl_short sdl = {
.sdl_family = AF_LINK,
.sdl_len = sizeof(struct sockaddr_dl_short),
.sdl_type = ifa->ifa_ifp->if_type,
.sdl_index = ifa->ifa_ifp->if_index,
};
struct sockaddr_in6 dst = {
.sin6_family = AF_INET6,
.sin6_len = sizeof(struct sockaddr_in6),
.sin6_addr = ia->ia_dstaddr.sin6_addr,
};
struct rt_addrinfo info = {
.rti_ifa = ifa,
.rti_ifp = ifa->ifa_ifp,
.rti_flags = RTF_PINNED | RTF_HOST,
.rti_info = {
[RTAX_DST] = (struct sockaddr *)&dst,
[RTAX_GATEWAY] = (struct sockaddr *)&sdl,
},
};
/* Don't set additional per-gw filters on removal */
NET_EPOCH_ENTER(et);
error = rib_handle_ifaddr_info(ifa->ifa_ifp->if_fib, cmd, &info);
NET_EPOCH_EXIT(et);
return (error);
}
static bool
ifa_is_p2p(struct in6_ifaddr *ia)
{
int plen;
plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
if ((plen == 128) && (ia->ia_dstaddr.sin6_family == AF_INET6) &&
!IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &ia->ia_dstaddr.sin6_addr))
return (true);
return (false);
}
int
in6_addifaddr(struct ifnet *ifp, struct in6_aliasreq *ifra, struct in6_ifaddr *ia)
{
struct nd_prefixctl pr0;
struct nd_prefix *pr;
int carp_attached = 0;
int error;
/*
* first, make or update the interface address structure,
* and link it to the list.
*/
if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
goto out;
if (ia != NULL) {
if (ia->ia_ifa.ifa_carp)
(*carp_detach_p)(&ia->ia_ifa, true);
ifa_free(&ia->ia_ifa);
}
if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) == NULL) {
/*
* this can happen when the user specify the 0 valid
* lifetime.
*/
return (0);
}
if (ifra->ifra_vhid > 0) {
if (carp_attach_p != NULL)
error = (*carp_attach_p)(&ia->ia_ifa,
ifra->ifra_vhid);
else
error = EPROTONOSUPPORT;
if (error)
goto out;
else
carp_attached = 1;
}
/*
* 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) {
/* we don't need to install a host route. */
goto aifaddr_out;
}
pr0.ndpr_prefix = ifra->ifra_addr;
/* apply the mask for safety. */
IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
&ifra->ifra_prefixmask.sin6_addr);
/*
* 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) {
if (carp_attached)
(*carp_detach_p)(&ia->ia_ifa, false);
goto out;
}
}
/* relate the address to the prefix */
if (ia->ia6_ndpr == NULL) {
ia->ia6_ndpr = pr;
pr->ndpr_addrcnt++;
/*
* If this is the first autoconf address from the
* prefix, create a temporary address as well
* (when required).
*/
if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) {
int e;
if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
log(LOG_NOTICE, "in6_control: failed "
"to create a temporary address, "
"errno=%d\n", e);
}
}
}
nd6_prefix_rele(pr);
/*
* this might affect the status of autoconfigured addresses,
* that is, this address might make other addresses detached.
*/
pfxlist_onlink_check();
aifaddr_out:
/*
* Try to clear the flag when a new IPv6 address is added
* onto an IFDISABLED interface and it succeeds.
*/
if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
struct in6_ndireq nd;
memset(&nd, 0, sizeof(nd));
nd.ndi.flags = ND_IFINFO(ifp)->flags;
nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
"SIOCSIFINFO_FLAGS for -ifdisabled "
"failed.");
/*
* Ignore failure of clearing the flag intentionally.
* The failure means address duplication was detected.
*/
}
error = 0;
out:
if (ia != NULL)
ifa_free(&ia->ia_ifa);
return (error);
}
void
in6_purgeaddr(struct ifaddr *ifa)
{
struct ifnet *ifp = ifa->ifa_ifp;
struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
struct in6_multi_mship *imm;
int error;
if (ifa->ifa_carp)
(*carp_detach_p)(ifa, false);
/*
* Remove the loopback route to the interface address.
* The check for the current setting of "nd6_useloopback"
* is not needed.
*/
if (ia->ia_flags & IFA_RTSELF) {
error = ifa_del_loopback_route((struct ifaddr *)ia,
(struct sockaddr *)&ia->ia_addr);
if (error == 0)
ia->ia_flags &= ~IFA_RTSELF;
}
/* stop DAD processing */
nd6_dad_stop(ifa);
/* Leave multicast groups. */
while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
LIST_REMOVE(imm, i6mm_chain);
if (imm->i6mm_maddr != NULL)
in6_leavegroup(imm->i6mm_maddr, NULL);
free(imm, M_IP6MADDR);
}
/* Check if we need to remove p2p route */
if ((ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) {
error = in6_handle_dstaddr_rtrequest(RTM_DELETE, ia);
if (error != 0)
log(LOG_INFO, "%s: err=%d, destination address delete "
"failed\n", __func__, error);
ia->ia_flags &= ~IFA_ROUTE;
}
in6_newaddrmsg(ia, RTM_DELETE);
in6_unlink_ifa(ia, ifp);
}
/*
* Removes @ia from the corresponding interfaces and unlinks corresponding
* prefix if no addresses are using it anymore.
*/
void
in6_purgeifaddr(struct in6_ifaddr *ia)
{
struct nd_prefix *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 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.
* Note that in6_purgeaddr() will decrement ndpr_addrcnt.
*/
pr = ia->ia6_ndpr;
in6_purgeaddr(&ia->ia_ifa);
if (pr != NULL && pr->ndpr_addrcnt == 0) {
ND6_WLOCK();
nd6_prefix_unlink(pr, NULL);
ND6_WUNLOCK();
nd6_prefix_del(pr);
}
}
static void
in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
{
char ip6buf[INET6_ADDRSTRLEN];
int remove_lle;
IF_ADDR_WLOCK(ifp);
CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
IF_ADDR_WUNLOCK(ifp);
ifa_free(&ia->ia_ifa); /* if_addrhead */
/*
* Defer the release of what might be the last reference to the
* in6_ifaddr so that it can't be freed before the remainder of the
* cleanup.
*/
IN6_IFADDR_WLOCK();
CK_STAILQ_REMOVE(&V_in6_ifaddrhead, ia, in6_ifaddr, ia_link);
CK_LIST_REMOVE(ia, ia6_hash);
IN6_IFADDR_WUNLOCK();
/*
* Release the reference to the base prefix. There should be a
* positive reference.
*/
remove_lle = 0;
if (ia->ia6_ndpr == NULL) {
nd6log((LOG_NOTICE,
"in6_unlink_ifa: autoconf'ed address "
"%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
} else {
ia->ia6_ndpr->ndpr_addrcnt--;
/* Do not delete lles within prefix if refcont != 0 */
if (ia->ia6_ndpr->ndpr_addrcnt == 0)
remove_lle = 1;
ia->ia6_ndpr = NULL;
}
nd6_rem_ifa_lle(ia, remove_lle);
/*
* Also, if the address being removed is autoconf'ed, call
* pfxlist_onlink_check() since the release might affect the status of
* other (detached) addresses.
*/
if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
pfxlist_onlink_check();
}
ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */
}
/*
* Notifies other subsystems about address change/arrival:
* 1) Notifies device handler on the first IPv6 address assignment
* 2) Handle routing table changes for P2P links and route
* 3) Handle routing table changes for address host route
*/
static int
in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
struct in6_aliasreq *ifra, int hostIsNew)
{
int error = 0, ifacount = 0;
struct ifaddr *ifa;
struct sockaddr_in6 *pdst;
char ip6buf[INET6_ADDRSTRLEN];
/*
* Give the interface a chance to initialize
* if this is its first address,
*/
if (hostIsNew != 0) {
struct epoch_tracker et;
NET_EPOCH_ENTER(et);
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ifacount++;
}
NET_EPOCH_EXIT(et);
}
if (ifacount <= 1 && ifp->if_ioctl) {
error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
if (error)
goto done;
}
/*
* 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.
*/
pdst = &ifra->ifra_dstaddr;
if (pdst->sin6_family == AF_INET6 &&
!IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
if ((ia->ia_flags & IFA_ROUTE) != 0 &&
(in6_handle_dstaddr_rtrequest(RTM_DELETE, ia) != 0)) {
nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
"remove a route to the old destination: %s\n",
ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
/* proceed anyway... */
} else
ia->ia_flags &= ~IFA_ROUTE;
ia->ia_dstaddr = *pdst;
}
/*
* If a new destination address is specified for a point-to-point
* interface, install a route to the destination as an interface
* direct route.
* XXX: the logic below rejects assigning multiple addresses on a p2p
* interface that share the same destination.
*/
if (!(ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) {
error = in6_handle_dstaddr_rtrequest(RTM_ADD, ia);
if (error)
goto done;
ia->ia_flags |= IFA_ROUTE;
}
/*
* add a loopback route to self if not exists
*/
if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
error = ifa_add_loopback_route((struct ifaddr *)ia,
(struct sockaddr *)&ia->ia_addr);
if (error == 0)
ia->ia_flags |= IFA_RTSELF;
}
done:
WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
"Invoking IPv6 network device address event may sleep");
ifa_ref(&ia->ia_ifa);
EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
IFADDR_EVENT_ADD);
ifa_free(&ia->ia_ifa);
return (error);
}
/*
* Find an IPv6 interface link-local address specific to an interface.
* ifaddr is returned referenced.
*/
struct in6_ifaddr *
in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
{
struct ifaddr *ifa;
NET_EPOCH_ASSERT();
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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;
ifa_ref(ifa);
break;
}
}
return ((struct in6_ifaddr *)ifa);
}
/*
* find the interface address corresponding to a given IPv6 address.
* ifaddr is returned referenced if @referenced flag is set.
*/
struct in6_ifaddr *
in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid, bool referenced)
{
struct rm_priotracker in6_ifa_tracker;
struct in6_ifaddr *ia;
IN6_IFADDR_RLOCK(&in6_ifa_tracker);
CK_LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
if (zoneid != 0 &&
zoneid != ia->ia_addr.sin6_scope_id)
continue;
if (referenced)
ifa_ref(&ia->ia_ifa);
break;
}
}
IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
return (ia);
}
/*
* find the internet address corresponding to a given interface and address.
* ifaddr is returned referenced.
*/
struct in6_ifaddr *
in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr)
{
struct epoch_tracker et;
struct ifaddr *ifa;
NET_EPOCH_ENTER(et);
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
ifa_ref(ifa);
break;
}
}
NET_EPOCH_EXIT(et);
return ((struct in6_ifaddr *)ifa);
}
/*
* Find a link-local scoped address on ifp and return it if any.
*/
struct in6_ifaddr *
in6ifa_llaonifp(struct ifnet *ifp)
{
struct epoch_tracker et;
struct sockaddr_in6 *sin6;
struct ifaddr *ifa;
if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
return (NULL);
NET_EPOCH_ENTER(et);
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
break;
}
NET_EPOCH_EXIT(et);
return ((struct in6_ifaddr *)ifa);
}
/*
* Convert IP6 address to printable (loggable) representation. Caller
* has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
*/
static char digits[] = "0123456789abcdef";
char *
ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
{
int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
char *cp;
const u_int16_t *a = (const u_int16_t *)addr;
const u_int8_t *d;
int dcolon = 0, zero = 0;
cp = ip6buf;
for (i = 0; i < 8; i++) {
if (*(a + i) == 0) {
cnt++;
if (cnt == 1)
idx = i;
}
else if (maxcnt < cnt) {
maxcnt = cnt;
index = idx;
cnt = 0;
}
}
if (maxcnt < cnt) {
maxcnt = cnt;
index = idx;
}
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 && i == index) {
if (i == 0)
*cp++ = ':';
*cp++ = ':';
dcolon = 1;
} else {
*cp++ = '0';
*cp++ = ':';
}
a++;
continue;
}
d = (const u_char *)a;
/* Try to eliminate leading zeros in printout like in :0001. */
zero = 1;
*cp = digits[*d >> 4];
if (*cp != '0') {
zero = 0;
cp++;
}
*cp = digits[*d++ & 0xf];
if (zero == 0 || (*cp != '0')) {
zero = 0;
cp++;
}
*cp = digits[*d >> 4];
if (zero == 0 || (*cp != '0')) {
zero = 0;
cp++;
}
*cp++ = digits[*d & 0xf];
*cp++ = ':';
a++;
}
*--cp = '\0';
return (ip6buf);
}
int
in6_localaddr(struct in6_addr *in6)
{
struct rm_priotracker in6_ifa_tracker;
struct in6_ifaddr *ia;
if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
return 1;
IN6_IFADDR_RLOCK(&in6_ifa_tracker);
CK_STAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
&ia->ia_prefixmask.sin6_addr)) {
IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
return 1;
}
}
IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
return (0);
}
/*
* Return 1 if an internet address is for the local host and configured
* on one of its interfaces.
*/
int
in6_localip(struct in6_addr *in6)
{
struct rm_priotracker in6_ifa_tracker;
struct in6_ifaddr *ia;
IN6_IFADDR_RLOCK(&in6_ifa_tracker);
CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
return (1);
}
}
IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
return (0);
}
/*
* Like in6_localip(), but FIB-aware.
*/
bool
in6_localip_fib(struct in6_addr *in6, uint16_t fib)
{
struct rm_priotracker in6_ifa_tracker;
struct in6_ifaddr *ia;
IN6_IFADDR_RLOCK(&in6_ifa_tracker);
CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr) &&
ia->ia_ifa.ifa_ifp->if_fib == fib) {
IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
return (true);
}
}
IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
return (false);
}
/*
* Return 1 if an internet address is configured on an interface.
*/
int
in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
{
struct in6_addr in6;
struct ifaddr *ifa;
struct in6_ifaddr *ia6;
NET_EPOCH_ASSERT();
in6 = *addr;
if (in6_clearscope(&in6))
return (0);
in6_setscope(&in6, ifp, NULL);
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ia6 = (struct in6_ifaddr *)ifa;
if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6))
return (1);
}
return (0);
}
int
in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
{
struct rm_priotracker in6_ifa_tracker;
struct in6_ifaddr *ia;
IN6_IFADDR_RLOCK(&in6_ifa_tracker);
CK_LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
return (1); /* true */
}
break;
}
}
IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
return (0); /* false */
}
/*
* return length of part which dst and src are equal
* hard coding...
*/
int
in6_matchlen(struct in6_addr *src, struct in6_addr *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(struct in6_addr *p1, struct in6_addr *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(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. if no address was
* found, return the first valid address from designated IF.
*/
struct in6_ifaddr *
in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
{
int dst_scope = in6_addrscope(dst), blen = -1, tlen;
struct ifaddr *ifa;
struct in6_ifaddr *besta = NULL;
struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
NET_EPOCH_ASSERT();
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.
*/
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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 (V_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);
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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 (V_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(struct ifnet *ifp)
{
struct epoch_tracker et;
struct ifaddr *ifa;
struct in6_ifaddr *ia;
NET_EPOCH_ENTER(et);
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ia = (struct in6_ifaddr *)ifa;
if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
/*
* The TENTATIVE flag was likely set by hand
* beforehand, implicitly indicating the need for DAD.
* We may be able to skip the random delay in this
* case, but we impose delays just in case.
*/
nd6_dad_start(ifa,
arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
}
}
NET_EPOCH_EXIT(et);
/*
* special cases, like 6to4, are handled in in6_ifattach
*/
in6_ifattach(ifp, NULL);
}
static void
in6_ifevent(void *arg __unused, struct ifnet *ifp, int event)
{
if (event == IFNET_EVENT_UP)
in6_if_up(ifp);
}
static void
in6_init(void *arg __unused)
{
EVENTHANDLER_REGISTER(ifnet_event, in6_ifevent, NULL, EVENTHANDLER_PRI_ANY);
}
SYSINIT(in6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, in6_init, NULL);
int
in6if_do_dad(struct ifnet *ifp)
{
if ((ifp->if_flags & IFF_LOOPBACK) != 0)
return (0);
if ((ifp->if_flags & IFF_MULTICAST) == 0)
return (0);
if ((ND_IFINFO(ifp)->flags &
(ND6_IFF_IFDISABLED | ND6_IFF_NO_DAD)) != 0)
return (0);
return (1);
}
/*
* Calculate max IPv6 MTU through all the interfaces and store it
* to in6_maxmtu.
*/
void
in6_setmaxmtu(void)
{
struct epoch_tracker et;
unsigned long maxmtu = 0;
struct ifnet *ifp;
NET_EPOCH_ENTER(et);
CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
/* 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);
}
NET_EPOCH_EXIT(et);
if (maxmtu) /* update only when maxmtu is positive */
V_in6_maxmtu = maxmtu;
}
/*
* Provide the length of interface identifiers to be used for the link attached
* to the given interface. The length should be defined in "IPv6 over
* xxx-link" document. Note that address architecture might also define
* the length for a particular set of address prefixes, regardless of the
* link type. As clarified in rfc2462bis, those two definitions should be
* consistent, and those really are as of August 2004.
*/
int
in6_if2idlen(struct ifnet *ifp)
{
switch (ifp->if_type) {
case IFT_ETHER: /* RFC2464 */
case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
case IFT_L2VLAN: /* ditto */
case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */
case IFT_INFINIBAND:
return (64);
case IFT_PPP: /* RFC2472 */
return (64);
case IFT_FRELAY: /* RFC2590 */
return (64);
case IFT_IEEE1394: /* RFC3146 */
return (64);
case IFT_GIF:
return (64); /* draft-ietf-v6ops-mech-v2-07 */
case IFT_LOOP:
return (64); /* XXX: is this really correct? */
default:
/*
* Unknown link type:
* It might be controversial to use the today's common constant
* of 64 for these cases unconditionally. For full compliance,
* we should return an error in this case. On the other hand,
* if we simply miss the standard for the link type or a new
* standard is defined for a new link type, the IFID length
* is very likely to be the common constant. As a compromise,
* we always use the constant, but make an explicit notice
* indicating the "unknown" case.
*/
printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
return (64);
}
}
struct in6_llentry {
struct llentry base;
};
#define IN6_LLTBL_DEFAULT_HSIZE 32
#define IN6_LLTBL_HASH(k, h) \
(((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
/*
* Do actual deallocation of @lle.
*/
static void
in6_lltable_destroy_lle_unlocked(epoch_context_t ctx)
{
struct llentry *lle;
lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
LLE_LOCK_DESTROY(lle);
LLE_REQ_DESTROY(lle);
free(lle, M_LLTABLE);
}
/*
* Called by LLE_FREE_LOCKED when number of references
* drops to zero.
*/
static void
in6_lltable_destroy_lle(struct llentry *lle)
{
LLE_WUNLOCK(lle);
NET_EPOCH_CALL(in6_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
}
static struct llentry *
in6_lltable_new(const struct in6_addr *addr6, u_int flags)
{
struct in6_llentry *lle;
lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
if (lle == NULL) /* NB: caller generates msg */
return NULL;
lle->base.r_l3addr.addr6 = *addr6;
lle->base.lle_refcnt = 1;
lle->base.lle_free = in6_lltable_destroy_lle;
LLE_LOCK_INIT(&lle->base);
LLE_REQ_INIT(&lle->base);
callout_init(&lle->base.lle_timer, 1);
return (&lle->base);
}
static int
in6_lltable_match_prefix(const struct sockaddr *saddr,
const struct sockaddr *smask, u_int flags, struct llentry *lle)
{
const struct in6_addr *addr, *mask, *lle_addr;
addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr;
mask = &((const struct sockaddr_in6 *)smask)->sin6_addr;
lle_addr = &lle->r_l3addr.addr6;
if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
return (0);
if (lle->la_flags & LLE_IFADDR) {
/*
* Delete LLE_IFADDR records IFF address & flag matches.
* Note that addr is the interface address within prefix
* being matched.
*/
if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) &&
(flags & LLE_STATIC) != 0)
return (1);
return (0);
}
/* flags & LLE_STATIC means deleting both dynamic and static entries */
if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
return (1);
return (0);
}
static void
in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
{
struct ifnet *ifp __diagused;
LLE_WLOCK_ASSERT(lle);
KASSERT(llt != NULL, ("lltable is NULL"));
/* Unlink entry from table */
if ((lle->la_flags & LLE_LINKED) != 0) {
ifp = llt->llt_ifp;
IF_AFDATA_WLOCK_ASSERT(ifp);
lltable_unlink_entry(llt, lle);
}
llentry_free(lle);
}
static int
in6_lltable_rtcheck(struct ifnet *ifp,
u_int flags,
const struct sockaddr *l3addr)
{
const struct sockaddr_in6 *sin6;
struct nhop_object *nh;
struct in6_addr dst;
uint32_t scopeid;
char ip6buf[INET6_ADDRSTRLEN];
int fibnum;
NET_EPOCH_ASSERT();
KASSERT(l3addr->sa_family == AF_INET6,
("sin_family %d", l3addr->sa_family));
sin6 = (const struct sockaddr_in6 *)l3addr;
in6_splitscope(&sin6->sin6_addr, &dst, &scopeid);
fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib;
nh = fib6_lookup(fibnum, &dst, scopeid, NHR_NONE, 0);
if (nh && ((nh->nh_flags & NHF_GATEWAY) || nh->nh_ifp != ifp)) {
struct ifaddr *ifa;
/*
* Create an ND6 cache for an IPv6 neighbor
* that is not covered by our own prefix.
*/
ifa = ifaof_ifpforaddr(l3addr, ifp);
if (ifa != NULL) {
return 0;
}
log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
ip6_sprintf(ip6buf, &sin6->sin6_addr));
return EINVAL;
}
return 0;
}
static inline uint32_t
in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
{
return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize));
}
static uint32_t
in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
{
return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize));
}
static void
in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
{
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)sa;
bzero(sin6, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_addr = lle->r_l3addr.addr6;
}
static inline struct llentry *
in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
{
struct llentry *lle;
struct llentries *lleh;
u_int hashidx;
hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
lleh = &llt->lle_head[hashidx];
CK_LIST_FOREACH(lle, lleh, lle_next) {
if (lle->la_flags & LLE_DELETED)
continue;
if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
break;
}
return (lle);
}
static void
in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
{
lle->la_flags |= LLE_DELETED;
/* Leave the solicited multicast group. */
if ((lle->la_flags & LLE_PUB) != 0)
in6_leave_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6);
EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
#ifdef DIAGNOSTIC
log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
#endif
llentry_free(lle);
}
static struct llentry *
in6_lltable_alloc(struct lltable *llt, u_int flags,
const struct sockaddr *l3addr)
{
const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
struct ifnet *ifp = llt->llt_ifp;
struct llentry *lle;
char linkhdr[LLE_MAX_LINKHDR];
size_t linkhdrsize;
int lladdr_off;
KASSERT(l3addr->sa_family == AF_INET6,
("sin_family %d", l3addr->sa_family));
/*
* A route that covers the given address must have
* been installed 1st because we are doing a resolution,
* verify this.
*/
if (!(flags & LLE_IFADDR) &&
in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
return (NULL);
lle = in6_lltable_new(&sin6->sin6_addr, flags);
if (lle == NULL) {
log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
return (NULL);
}
lle->la_flags = flags;
if ((flags & LLE_IFADDR) == LLE_IFADDR) {
linkhdrsize = LLE_MAX_LINKHDR;
if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp),
linkhdr, &linkhdrsize, &lladdr_off) != 0) {
in6_lltable_free_entry(llt, lle);
return (NULL);
}
lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
lladdr_off);
lle->la_flags |= LLE_STATIC;
}
if ((lle->la_flags & LLE_STATIC) != 0)
lle->ln_state = ND6_LLINFO_REACHABLE;
return (lle);
}
static struct llentry *
in6_lltable_lookup(struct lltable *llt, u_int flags,
const struct sockaddr *l3addr)
{
const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
int family = flags >> 16;
struct llentry *lle;
IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
KASSERT(l3addr->sa_family == AF_INET6,
("sin_family %d", l3addr->sa_family));
KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
(LLE_UNLOCKED | LLE_EXCLUSIVE),
("wrong lle request flags: %#x", flags));
lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
if (__predict_false(family != AF_INET6))
lle = llentry_lookup_family(lle, family);
if (lle == NULL)
return (NULL);
if (flags & LLE_UNLOCKED)
return (lle);
if (flags & LLE_EXCLUSIVE)
LLE_WLOCK(lle);
else
LLE_RLOCK(lle);
/*
* If the afdata lock is not held, the LLE may have been unlinked while
* we were blocked on the LLE lock. Check for this case.
*/
if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
if (flags & LLE_EXCLUSIVE)
LLE_WUNLOCK(lle);
else
LLE_RUNLOCK(lle);
return (NULL);
}
return (lle);
}
static int
in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
struct sysctl_req *wr)
{
struct ifnet *ifp = llt->llt_ifp;
/* XXX stack use */
struct {
struct rt_msghdr rtm;
struct sockaddr_in6 sin6;
/*
* ndp.c assumes that sdl is word aligned
*/
#ifdef __LP64__
uint32_t pad;
#endif
struct sockaddr_dl sdl;
} ndpc;
struct sockaddr_dl *sdl;
int error;
bzero(&ndpc, sizeof(ndpc));
/* skip deleted entries */
if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
return (0);
/* Skip if jailed and not a valid IP of the prison. */
lltable_fill_sa_entry(lle, (struct sockaddr *)&ndpc.sin6);
if (prison_if(wr->td->td_ucred, (struct sockaddr *)&ndpc.sin6) != 0)
return (0);
/*
* produce a msg made of:
* struct rt_msghdr;
* struct sockaddr_in6 (IPv6)
* struct sockaddr_dl;
*/
ndpc.rtm.rtm_msglen = sizeof(ndpc);
ndpc.rtm.rtm_version = RTM_VERSION;
ndpc.rtm.rtm_type = RTM_GET;
ndpc.rtm.rtm_flags = RTF_UP;
ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
sa6_recoverscope(&ndpc.sin6);
/* publish */
if (lle->la_flags & LLE_PUB)
ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
sdl = &ndpc.sdl;
sdl->sdl_family = AF_LINK;
sdl->sdl_len = sizeof(*sdl);
sdl->sdl_index = ifp->if_index;
sdl->sdl_type = ifp->if_type;
if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
sdl->sdl_alen = ifp->if_addrlen;
bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
} else {
sdl->sdl_alen = 0;
bzero(LLADDR(sdl), ifp->if_addrlen);
}
if (lle->la_expire != 0)
ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire +
lle->lle_remtime / hz + time_second - time_uptime;
ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
if (lle->la_flags & LLE_STATIC)
ndpc.rtm.rtm_flags |= RTF_STATIC;
if (lle->la_flags & LLE_IFADDR)
ndpc.rtm.rtm_flags |= RTF_PINNED;
if (lle->ln_router != 0)
ndpc.rtm.rtm_flags |= RTF_GATEWAY;
ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked;
/* Store state in rmx_weight value */
ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state;
ndpc.rtm.rtm_index = ifp->if_index;
error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
return (error);
}
static void
in6_lltable_post_resolved(struct lltable *llt, struct llentry *lle)
{
/* Join the solicited multicast group for dst. */
if ((lle->la_flags & LLE_PUB) == LLE_PUB)
in6_join_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6);
}
static struct lltable *
in6_lltattach(struct ifnet *ifp)
{
struct lltable *llt;
llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
llt->llt_af = AF_INET6;
llt->llt_ifp = ifp;
llt->llt_lookup = in6_lltable_lookup;
llt->llt_alloc_entry = in6_lltable_alloc;
llt->llt_delete_entry = in6_lltable_delete_entry;
llt->llt_dump_entry = in6_lltable_dump_entry;
llt->llt_hash = in6_lltable_hash;
llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
llt->llt_free_entry = in6_lltable_free_entry;
llt->llt_match_prefix = in6_lltable_match_prefix;
llt->llt_mark_used = llentry_mark_used;
llt->llt_post_resolved = in6_lltable_post_resolved;
lltable_link(llt);
return (llt);
}
struct lltable *
in6_lltable_get(struct ifnet *ifp)
{
struct lltable *llt = NULL;
void *afdata_ptr = ifp->if_afdata[AF_INET6];
if (afdata_ptr != NULL)
llt = ((struct in6_ifextra *)afdata_ptr)->lltable;
return (llt);
}
void *
in6_domifattach(struct ifnet *ifp)
{
struct in6_ifextra *ext;
/* There are not IPv6-capable interfaces. */
switch (ifp->if_type) {
case IFT_PFLOG:
case IFT_PFSYNC:
case IFT_USB:
return (NULL);
}
ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
bzero(ext, sizeof(*ext));
ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
M_WAITOK);
COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
ext->nd_ifinfo = nd6_ifattach(ifp);
ext->scope6_id = scope6_ifattach(ifp);
ext->lltable = in6_lltattach(ifp);
ext->mld_ifinfo = mld_domifattach(ifp);
return ext;
}
int
in6_domifmtu(struct ifnet *ifp)
{
if (ifp->if_afdata[AF_INET6] == NULL)
return ifp->if_mtu;
return (IN6_LINKMTU(ifp));
}
void
in6_domifdetach(struct ifnet *ifp, void *aux)
{
struct in6_ifextra *ext = (struct in6_ifextra *)aux;
mld_domifdetach(ifp);
scope6_ifdetach(ext->scope6_id);
nd6_ifdetach(ifp, ext->nd_ifinfo);
lltable_free(ext->lltable);
COUNTER_ARRAY_FREE(ext->in6_ifstat,
sizeof(struct in6_ifstat) / sizeof(uint64_t));
free(ext->in6_ifstat, M_IFADDR);
COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
free(ext->icmp6_ifstat, M_IFADDR);
free(ext, M_IFADDR);
}
/*
* 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;
sin6_p = malloc(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;
}
/*
* Join/leave the solicited multicast groups for proxy NDP entries.
*/
static void
in6_join_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst)
{
struct in6_multi *inm;
struct in6_addr mltaddr;
char ip6buf[INET6_ADDRSTRLEN];
int error;
if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0)
return; /* error logged in in6_solicited_node_maddr. */
error = in6_joingroup(ifp, &mltaddr, NULL, &inm, 0);
if (error != 0) {
nd6log((LOG_WARNING,
"%s: in6_joingroup failed for %s on %s (errno=%d)\n",
__func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp),
error));
}
}
static void
in6_leave_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst)
{
struct epoch_tracker et;
struct in6_multi *inm;
struct in6_addr mltaddr;
char ip6buf[INET6_ADDRSTRLEN];
if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0)
return; /* error logged in in6_solicited_node_maddr. */
NET_EPOCH_ENTER(et);
inm = in6m_lookup(ifp, &mltaddr);
NET_EPOCH_EXIT(et);
if (inm != NULL)
in6_leavegroup(inm, NULL);
else
nd6log((LOG_WARNING, "%s: in6m_lookup failed for %s on %s\n",
__func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp)));
}
static bool
in6_lle_match_pub(struct lltable *llt, struct llentry *lle, void *farg)
{
return ((lle->la_flags & LLE_PUB) != 0);
}
void
in6_purge_proxy_ndp(struct ifnet *ifp)
{
struct lltable *llt;
bool need_purge;
if (ifp->if_afdata[AF_INET6] == NULL)
return;
llt = LLTABLE6(ifp);
IF_AFDATA_WLOCK(ifp);
need_purge = ((llt->llt_flags & LLT_ADDEDPROXY) != 0);
IF_AFDATA_WUNLOCK(ifp);
/*
* Ever added proxy ndp entries, leave solicited node multicast
* before deleting the llentry.
*/
if (need_purge)
lltable_delete_conditional(llt, in6_lle_match_pub, NULL);
}
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