/* $FreeBSD$ */
/* $KAME: if_stf.c,v 1.73 2001/12/03 11:08:30 keiichi Exp $ */
/*-
* Copyright (C) 2000 WIDE Project.
* Copyright (c) 2010 Hiroki Sato <hrs@FreeBSD.org>
* Copyright (c) 2013 Ermal Lu�i <eri@FreeBSD.org>
* 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.
*/
/*
* 6to4 interface, based on RFC3056 + 6rd (RFC5569) support.
*
* 6to4 interface is NOT capable of link-layer (I mean, IPv4) multicasting.
* There is no address mapping defined from IPv6 multicast address to IPv4
* address. Therefore, we do not have IFF_MULTICAST on the interface.
*
* Due to the lack of address mapping for link-local addresses, we cannot
* throw packets toward link-local addresses (fe80::x). Also, we cannot throw
* packets to link-local multicast addresses (ff02::x).
*
* Here are interesting symptoms due to the lack of link-local address:
*
* Unicast routing exchange:
* - RIPng: Impossible. Uses link-local multicast packet toward ff02::9,
* and link-local addresses as nexthop.
* - OSPFv6: Impossible. OSPFv6 assumes that there's link-local address
* assigned to the link, and makes use of them. Also, HELLO packets use
* link-local multicast addresses (ff02::5 and ff02::6).
* - BGP4+: Maybe. You can only use global address as nexthop, and global
* address as TCP endpoint address.
*
* Multicast routing protocols:
* - PIM: Hello packet cannot be used to discover adjacent PIM routers.
* Adjacent PIM routers must be configured manually (is it really spec-wise
* correct thing to do?).
*
* ICMPv6:
* - Redirects cannot be used due to the lack of link-local address.
*
* stf interface does not have, and will not need, a link-local address.
* It seems to have no real benefit and does not help the above symptoms much.
* Even if we assign link-locals to interface, we cannot really
* use link-local unicast/multicast on top of 6to4 cloud (since there's no
* encapsulation defined for link-local address), and the above analysis does
* not change. RFC3056 does not mandate the assignment of link-local address
* either.
*
* 6to4 interface has security issues. Refer to
* http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt
* for details. The code tries to filter out some of malicious packets.
* Note that there is no way to be 100% secure.
*
* 6rd (RFC5569 & RFC5969) extension is enabled when an IPv6 GUA other than
* 2002::/16 is assigned. The stf(4) recognizes a 32-bit just after
* prefixlen as the IPv4 address of the 6rd customer site. The
* prefixlen must be shorter than 32.
*
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/protosw.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <machine/cpu.h>
#include <sys/malloc.h>
#include <sys/priv.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_clone.h>
#include <net/route.h>
#include <net/netisr.h>
#include <net/if_types.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_var.h>
#include <net/if_stf.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_var.h>
#include <netinet/ip_ecn.h>
#include <netinet/ip_encap.h>
#include <machine/stdarg.h>
#include <net/bpf.h>
#include <security/mac/mac_framework.h>
#define STF_DEBUG 1
#if STF_DEBUG > 3
#define ip_sprintf(buf, a) \
sprintf(buf, "%u.%u.%u.%u", \
(ntohl((a)->s_addr)>>24)&0xFF, \
(ntohl((a)->s_addr)>>16)&0xFF, \
(ntohl((a)->s_addr)>>8)&0xFF, \
(ntohl((a)->s_addr))&0xFF);
#endif
#if STF_DEBUG
#define DEBUG_PRINTF(a, ...) \
do { \
if (V_stf_debug >= a) \
printf(__VA_ARGS__); \
} while (0)
#else
#define DEBUG_PRINTF(a, ...)
#endif
SYSCTL_DECL(_net_link);
static SYSCTL_NODE(_net_link, IFT_STF, stf, CTLFLAG_RW, 0, "6to4 Interface");
static VNET_DEFINE(int, stf_route_cache) = 0;
#define V_stf_route_cache VNET(stf_route_cache)
SYSCTL_VNET_INT(_net_link_stf, OID_AUTO, route_cache, CTLFLAG_RW,
&VNET_NAME(stf_route_cache), 0,
"Enable caching of IPv4 routes for 6to4 output.");
#if STF_DEBUG
static VNET_DEFINE(int, stf_debug) = 0;
#define V_stf_debug VNET(stf_debug)
SYSCTL_VNET_INT(_net_link_stf, OID_AUTO, stf_debug, CTLFLAG_RW,
&VNET_NAME(stf_debug), 0,
"Enable displaying verbose debug message of stf interfaces");
#endif
static int stf_permit_rfc1918 = 1;
TUNABLE_INT("net.link.stf.permit_rfc1918", &stf_permit_rfc1918);
SYSCTL_INT(_net_link_stf, OID_AUTO, permit_rfc1918, CTLFLAG_RW | CTLFLAG_TUN,
&stf_permit_rfc1918, 0, "Permit the use of private IPv4 addresses");
#define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
/*
* XXX: Return a pointer with 16-bit aligned. Don't cast it to
* struct in_addr *; use bcopy() instead.
*/
#define GET_V4(x) (&(x)->s6_addr16[1])
struct stf_softc {
struct ifnet *sc_ifp;
in_addr_t dstv4_addr;
in_addr_t srcv4_addr;
in_addr_t inaddr;
u_int v4prefixlen;
union {
struct route __sc_ro4;
struct route_in6 __sc_ro6; /* just for safety */
} __sc_ro46;
#define sc_ro __sc_ro46.__sc_ro4
struct mtx sc_mtx;
u_int sc_fibnum;
const struct encaptab *encap_cookie;
u_int sc_flags;
LIST_ENTRY(stf_softc) stf_list;
};
#define STF2IFP(sc) ((sc)->sc_ifp)
static const char stfname[] = "stf";
static struct mtx stf_mtx;
static MALLOC_DEFINE(M_STF, stfname, "6to4 Tunnel Interface");
static VNET_DEFINE(LIST_HEAD(, stf_softc), stf_softc_list);
#define V_stf_softc_list VNET(stf_softc_list)
#define STF_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "stf softc", \
NULL, MTX_DEF);
#define STF_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx)
#define STF_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
#define STF_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
#define STF_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED)
static const int ip_stf_ttl = 40;
extern struct domain inetdomain;
struct protosw in_stf_protosw = {
.pr_type = SOCK_RAW,
.pr_domain = &inetdomain,
.pr_protocol = IPPROTO_IPV6,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_input = in_stf_input,
.pr_output = (pr_output_t *)rip_output,
.pr_ctloutput = rip_ctloutput,
.pr_usrreqs = &rip_usrreqs
};
static int stfmodevent(module_t, int, void *);
static int stf_encapcheck(const struct mbuf *, int, int, void *);
static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *);
static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *,
struct route *);
static int isrfc1918addr(struct in_addr *);
static int stf_checkaddr4(struct stf_softc *, struct in_addr *,
struct ifnet *);
static int stf_checkaddr6(struct stf_softc *, struct in6_addr *,
struct ifnet *);
static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
static int stf_ioctl(struct ifnet *, u_long, caddr_t);
#define STF_GETIN4_USE_CACHE 1
static struct sockaddr_in *stf_getin4addr(struct stf_softc *, struct sockaddr_in *,
struct ifaddr *, int);
static struct sockaddr_in *stf_getin4addr_in6(struct stf_softc *, struct sockaddr_in *,
struct ifaddr *, const struct in6_addr *);
static struct sockaddr_in *stf_getin4addr_sin6(struct stf_softc *, struct sockaddr_in *,
struct ifaddr *, struct sockaddr_in6 *);
static int stf_clone_create(struct if_clone *, int, caddr_t);
static void stf_clone_destroy(struct ifnet *);
static struct if_clone *stf_cloner;
static int
stf_clone_create(struct if_clone *ifc, int unit, caddr_t params)
{
struct stf_softc *sc;
struct ifnet *ifp;
sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO);
sc->sc_fibnum = curthread->td_proc->p_fibnum;
ifp = STF2IFP(sc) = if_alloc(IFT_STF);
if (sc->sc_ifp == NULL) {
free(sc, M_STF);
return (ENOMEM);
}
STF_LOCK_INIT(sc);
ifp->if_softc = sc;
if_initname(ifp, stfname, unit);
sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6,
stf_encapcheck, &in_stf_protosw, sc);
if (sc->encap_cookie == NULL) {
if_printf(ifp, "attach failed\n");
if_free(ifp);
free(sc, M_STF);
return (ENOMEM);
}
ifp->if_mtu = IPV6_MMTU;
ifp->if_ioctl = stf_ioctl;
ifp->if_output = stf_output;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
if_attach(ifp);
bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
mtx_lock(&stf_mtx);
LIST_INSERT_HEAD(&V_stf_softc_list, sc, stf_list);
mtx_unlock(&stf_mtx);
return (0);
}
static void
stf_clone_destroy(struct ifnet *ifp)
{
struct stf_softc *sc = ifp->if_softc;
int err;
mtx_lock(&stf_mtx);
LIST_REMOVE(sc, stf_list);
mtx_unlock(&stf_mtx);
err = encap_detach(sc->encap_cookie);
KASSERT(err == 0, ("Unexpected error detaching encap_cookie"));
bpfdetach(ifp);
if_detach(ifp);
if_free(ifp);
STF_LOCK_DESTROY(sc);
free(sc, M_STF);
}
static void
vnet_stf_init(const void *unused __unused)
{
LIST_INIT(&V_stf_softc_list);
}
VNET_SYSINIT(vnet_stf_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, vnet_stf_init,
NULL);
static int
stfmodevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
mtx_init(&stf_mtx, "stf_mtx", NULL, MTX_DEF);
stf_cloner = if_clone_simple(stfname,
stf_clone_create, stf_clone_destroy, 0);
break;
case MOD_UNLOAD:
if_clone_detach(stf_cloner);
mtx_destroy(&stf_mtx);
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t stf_mod = {
"if_stf",
stfmodevent,
0
};
DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(if_stf, 1);
static int
stf_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
{
struct ip ip;
struct in6_ifaddr *ia6;
struct sockaddr_in ia6_in4addr;
struct sockaddr_in ia6_in4mask;
struct sockaddr_in *sin;
struct stf_softc *sc;
struct ifnet *ifp;
int ret = 0;
DEBUG_PRINTF(1, "%s: enter\n", __func__);
sc = (struct stf_softc *)arg;
if (sc == NULL)
return 0;
ifp = STF2IFP(sc);
if ((ifp->if_flags & IFF_UP) == 0)
return 0;
/* IFF_LINK0 means "no decapsulation" */
if ((ifp->if_flags & IFF_LINK0) != 0)
return 0;
if (proto != IPPROTO_IPV6)
return 0;
/* LINTED const cast */
m_copydata((struct mbuf *)(uintptr_t)m, 0, sizeof(ip), (caddr_t)&ip);
if (ip.ip_v != 4)
return 0;
/* Lookup an ia6 whose IPv4 addr encoded in the IPv6 addr is valid. */
ia6 = stf_getsrcifa6(ifp);
if (ia6 == NULL)
return 0;
if (sc->srcv4_addr != INADDR_ANY) {
sin = &ia6_in4addr;
sin->sin_addr.s_addr = sc->srcv4_addr;
sin->sin_family = AF_INET;
} else {
sin = stf_getin4addr(sc, &ia6_in4addr, &ia6->ia_ifa, STF_GETIN4_USE_CACHE);
if (sin == NULL)
return (0);
}
#if STF_DEBUG > 3
{
char buf[INET6_ADDRSTRLEN + 1];
memset(&buf, 0, sizeof(buf));
ip6_sprintf(buf, &satosin6(ia6->ia_ifa.ifa_addr)->sin6_addr);
DEBUG_PRINTF(1, "%s: ia6->ia_ifa.ifa_addr = %s\n", __func__, buf);
ip6_sprintf(buf, &ia6->ia_addr.sin6_addr);
DEBUG_PRINTF(1, "%s: ia6->ia_addr = %s\n", __func__, buf);
ip6_sprintf(buf, &satosin6(ia6->ia_ifa.ifa_netmask)->sin6_addr);
DEBUG_PRINTF(1, "%s: ia6->ia_ifa.ifa_netmask = %s\n", __func__, buf);
ip6_sprintf(buf, &ia6->ia_prefixmask.sin6_addr);
DEBUG_PRINTF(1, "%s: ia6->ia_prefixmask = %s\n", __func__, buf);
ip_sprintf(buf, &ia6_in4addr.sin_addr);
DEBUG_PRINTF(1, "%s: ia6_in4addr.sin_addr = %s\n", __func__, buf);
ip_sprintf(buf, &ip.ip_src);
DEBUG_PRINTF(1, "%s: ip.ip_src = %s\n", __func__, buf);
ip_sprintf(buf, &ip.ip_dst);
DEBUG_PRINTF(1, "%s: ip.ip_dst = %s\n", __func__, buf);
}
#endif
/*
* check if IPv4 dst matches the IPv4 address derived from the
* local 6to4 address.
* success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
*/
DEBUG_PRINTF(1, "%s: check1: ia6_in4addr.sin_addr == ip.ip_dst?\n", __func__);
if (ia6_in4addr.sin_addr.s_addr != ip.ip_dst.s_addr) {
DEBUG_PRINTF(1, "%s: check1: false. Ignore this packet.\n", __func__);
goto freeit;
}
DEBUG_PRINTF(1, "%s: check2: ia6->ia_addr is 2002::/16?\n", __func__);
if (IN6_IS_ADDR_6TO4(&ia6->ia_addr.sin6_addr)) {
/* 6to4 (RFC 3056) */
/*
* check if IPv4 src matches the IPv4 address derived
* from the local 6to4 address masked by prefixmask.
* success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
* fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
*/
DEBUG_PRINTF(1, "%s: check2: true.\n", __func__);
memcpy(&ia6_in4mask.sin_addr,
GET_V4(&ia6->ia_prefixmask.sin6_addr),
sizeof(ia6_in4mask));
#if STF_DEBUG > 3
{
char buf[INET6_ADDRSTRLEN + 1];
memset(&buf, 0, sizeof(buf));
ip_sprintf(buf, &ia6_in4addr.sin_addr);
DEBUG_PRINTF(1, "%s: ia6->ia_addr = %s\n",
__func__, buf);
ip_sprintf(buf, &ip.ip_src);
DEBUG_PRINTF(1, "%s: ip.ip_src = %s\n",
__func__, buf);
ip_sprintf(buf, &ia6_in4mask.sin_addr);
DEBUG_PRINTF(1, "%s: ia6->ia_prefixmask = %s\n",
__func__, buf);
DEBUG_PRINTF(1, "%s: check3: ia6_in4addr.sin_addr & mask == ip.ip_src & mask\n",
__func__);
}
#endif
if ((ia6_in4addr.sin_addr.s_addr & ia6_in4mask.sin_addr.s_addr) !=
(ip.ip_src.s_addr & ia6_in4mask.sin_addr.s_addr)) {
DEBUG_PRINTF(1, "%s: check3: false. Ignore this packet.\n",
__func__);
goto freeit;
}
} else {
/* 6rd (RFC 5569) */
DEBUG_PRINTF(1, "%s: check2: false. 6rd.\n", __func__);
/*
* No restriction on the src address in the case of
* 6rd because the stf(4) interface always has a
* prefix which covers whole of IPv4 src address
* range. So, stf_output() will catch all of
* 6rd-capsuled IPv4 traffic with suspicious inner dst
* IPv4 address (i.e. the IPv6 destination address is
* one the admin does not like to route to outside),
* and then it discard them silently.
*/
}
DEBUG_PRINTF(1, "%s: all clear!\n", __func__);
/* stf interface makes single side match only */
ret = 32;
freeit:
ifa_free(&ia6->ia_ifa);
return (ret);
}
static struct in6_ifaddr *
stf_getsrcifa6(struct ifnet *ifp)
{
struct ifaddr *ifa;
struct in_ifaddr *ia4;
struct sockaddr_in *sin;
struct sockaddr_in in4;
struct stf_softc *sc;
sc = ifp->if_softc;
if_addr_rlock(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (sc->srcv4_addr != INADDR_ANY) {
in4.sin_addr.s_addr = sc->srcv4_addr;
sin = &in4;
} else if ((sin = stf_getin4addr(ifp->if_softc, &in4, ifa,
STF_GETIN4_USE_CACHE)) == NULL)
continue;
LIST_FOREACH(ia4, INADDR_HASH(sin->sin_addr.s_addr), ia_hash)
if (ia4->ia_addr.sin_addr.s_addr == sin->sin_addr.s_addr)
break;
if (ia4 == NULL)
continue;
#if STF_DEBUG > 3
{
char buf[INET6_ADDRSTRLEN + 1];
memset(&buf, 0, sizeof(buf));
ip6_sprintf(buf, &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr);
DEBUG_PRINTF(1, "%s: ifa->ifa_addr->sin6_addr = %s\n",
__func__, buf);
ip_sprintf(buf, &ia4->ia_addr.sin_addr);
DEBUG_PRINTF(1, "%s: ia4->ia_addr.sin_addr = %s\n",
__func__, buf);
}
#endif
ifa_ref(ifa);
if_addr_runlock(ifp);
return (ifatoia6(ifa));
}
if_addr_runlock(ifp);
return (NULL);
}
static int
stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
struct route *ro)
{
struct stf_softc *sc;
const struct sockaddr_in6 *dst6;
struct route *cached_route;
struct sockaddr_in *sin;
struct sockaddr_in in4;
struct sockaddr_in *dst4;
u_int8_t tos;
struct ip *ip;
struct ip6_hdr *ip6;
struct in6_ifaddr *ia6;
int error;
#ifdef MAC
error = mac_ifnet_check_transmit(ifp, m);
if (error) {
m_freem(m);
return (error);
}
#endif
sc = ifp->if_softc;
dst6 = (const struct sockaddr_in6 *)dst;
/* just in case */
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
ifp->if_oerrors++;
return ENETDOWN;
}
/*
* If we don't have an ip4 address that match my inner ip6 address,
* we shouldn't generate output. Without this check, we'll end up
* using wrong IPv4 source.
*/
ia6 = stf_getsrcifa6(ifp);
if (ia6 == NULL) {
m_freem(m);
ifp->if_oerrors++;
return ENETDOWN;
}
if (m->m_len < sizeof(*ip6)) {
m = m_pullup(m, sizeof(*ip6));
if (!m) {
ifa_free(&ia6->ia_ifa);
ifp->if_oerrors++;
return ENOBUFS;
}
}
ip6 = mtod(m, struct ip6_hdr *);
tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
/*
* Pickup the right outer dst addr from the list of candidates.
* ip6_dst has priority as it may be able to give us shorter IPv4 hops.
* ip6_dst: destination addr in the packet header.
* dst6: destination addr specified in function argument.
*/
DEBUG_PRINTF(1, "%s: dst addr selection\n", __func__);
sin = stf_getin4addr_in6(sc, &in4, &ia6->ia_ifa, &ip6->ip6_dst);
if (sin == NULL) {
if (sc->dstv4_addr != INADDR_ANY)
in4.sin_addr.s_addr = sc->dstv4_addr;
else {
sin = stf_getin4addr_in6(sc, &in4, &ia6->ia_ifa, &dst6->sin6_addr);
if (sin == NULL) {
ifa_free(&ia6->ia_ifa);
m_freem(m);
ifp->if_oerrors++;
return ENETUNREACH;
}
}
}
#if STF_DEBUG > 3
{
char buf[INET6_ADDRSTRLEN + 1];
memset(&buf, 0, sizeof(buf));
ip_sprintf(buf, &in4.sin_addr);
DEBUG_PRINTF(1, "%s: ip_dst = %s\n", __func__, buf);
}
#endif
if (bpf_peers_present(ifp->if_bpf)) {
/*
* We need to prepend the address family as
* a four byte field. Cons up a dummy header
* to pacify bpf. This is safe because bpf
* will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer a to it).
*/
u_int af = AF_INET6;
bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
}
M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
if (m == NULL) {
ifa_free(&ia6->ia_ifa);
ifp->if_oerrors++;
return ENOBUFS;
}
ip = mtod(m, struct ip *);
bzero(ip, sizeof(*ip));
bcopy(&in4.sin_addr, &ip->ip_dst, sizeof(ip->ip_dst));
if (sc->srcv4_addr != INADDR_ANY)
in4.sin_addr.s_addr = sc->srcv4_addr;
else {
sin = stf_getin4addr_sin6(sc, &in4, &ia6->ia_ifa, &ia6->ia_addr);
if (sin == NULL) {
ifa_free(&ia6->ia_ifa);
m_freem(m);
ifp->if_oerrors++;
return ENETUNREACH;
}
}
bcopy(&in4.sin_addr, &ip->ip_src, sizeof(ip->ip_src));
#if STF_DEBUG > 3
{
char buf[INET6_ADDRSTRLEN + 1];
memset(&buf, 0, sizeof(buf));
ip_sprintf(buf, &ip->ip_src);
DEBUG_PRINTF(1, "%s: ip_src = %s\n", __func__, buf);
}
#endif
ifa_free(&ia6->ia_ifa);
ip->ip_p = IPPROTO_IPV6;
ip->ip_ttl = ip_stf_ttl;
ip->ip_len = htons(m->m_pkthdr.len);
if (ifp->if_flags & IFF_LINK1)
ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos);
else
ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos);
if (!V_stf_route_cache) {
cached_route = NULL;
goto sendit;
}
/*
* Do we have a cached route?
*/
STF_LOCK(sc);
dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst;
if (dst4->sin_family != AF_INET ||
bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) {
/* cache route doesn't match */
dst4->sin_family = AF_INET;
dst4->sin_len = sizeof(struct sockaddr_in);
bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr));
if (sc->sc_ro.ro_rt) {
RTFREE(sc->sc_ro.ro_rt);
sc->sc_ro.ro_rt = NULL;
}
}
if (sc->sc_ro.ro_rt == NULL) {
rtalloc_fib(&sc->sc_ro, sc->sc_fibnum);
if (sc->sc_ro.ro_rt == NULL) {
m_freem(m);
ifp->if_oerrors++;
STF_UNLOCK(sc);
return ENETUNREACH;
}
if (sc->sc_ro.ro_rt->rt_ifp == ifp) {
/* infinite loop detection */
m_free(m);
ifp->if_oerrors++;
STF_UNLOCK(sc);
return ENETUNREACH;
}
}
cached_route = &sc->sc_ro;
sendit:
M_SETFIB(m, sc->sc_fibnum);
ifp->if_opackets++;
DEBUG_PRINTF(1, "%s: ip_output dispatch.\n", __func__);
error = ip_output(m, NULL, cached_route, 0, NULL, NULL);
if (cached_route != NULL)
STF_UNLOCK(sc);
return (error);
}
static int
isrfc1918addr(struct in_addr *in)
{
/*
* returns 1 if private address range:
* 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
*/
if (stf_permit_rfc1918 == 0 && (
(ntohl(in->s_addr) & 0xff000000) == 10 << 24 ||
(ntohl(in->s_addr) & 0xfff00000) == (172 * 256 + 16) << 16 ||
(ntohl(in->s_addr) & 0xffff0000) == (192 * 256 + 168) << 16 ))
return 1;
return 0;
}
static int
stf_checkaddr4(struct stf_softc *sc, struct in_addr *in, struct ifnet *inifp)
{
struct in_ifaddr *ia4;
/*
* reject packets with the following address:
* 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8
*/
if (IN_MULTICAST(ntohl(in->s_addr)))
return -1;
switch ((ntohl(in->s_addr) & 0xff000000) >> 24) {
case 0: case 127: case 255:
return -1;
}
/*
* reject packets with broadcast
*/
IN_IFADDR_RLOCK();
TAILQ_FOREACH(ia4, &V_in_ifaddrhead, ia_link) {
if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
continue;
if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
IN_IFADDR_RUNLOCK();
return -1;
}
}
IN_IFADDR_RUNLOCK();
/*
* perform ingress filter
*/
if (sc && (STF2IFP(sc)->if_flags & IFF_LINK2) == 0 && inifp) {
struct sockaddr_in sin;
struct rtentry *rt;
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
sin.sin_addr = *in;
rt = rtalloc1_fib((struct sockaddr *)&sin, 0,
0UL, sc->sc_fibnum);
if (!rt || rt->rt_ifp != inifp) {
#if 0
log(LOG_WARNING, "%s: packet from 0x%x dropped "
"due to ingress filter\n", if_name(STF2IFP(sc)),
(u_int32_t)ntohl(sin.sin_addr.s_addr));
#endif
if (rt)
RTFREE_LOCKED(rt);
return -1;
}
RTFREE_LOCKED(rt);
}
return 0;
}
static int
stf_checkaddr6(struct stf_softc *sc, struct in6_addr *in6, struct ifnet *inifp)
{
/*
* check 6to4 addresses
*/
if (IN6_IS_ADDR_6TO4(in6)) {
struct in_addr in4;
bcopy(GET_V4(in6), &in4, sizeof(in4));
return stf_checkaddr4(sc, &in4, inifp);
}
/*
* reject anything that look suspicious. the test is implemented
* in ip6_input too, but we check here as well to
* (1) reject bad packets earlier, and
* (2) to be safe against future ip6_input change.
*/
if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6))
return -1;
return 0;
}
void
in_stf_input(struct mbuf *m, int off)
{
int proto;
struct stf_softc *sc;
struct ip *ip;
struct ip6_hdr *ip6;
u_int8_t otos, itos;
struct ifnet *ifp;
struct route_in6 rin6;
proto = mtod(m, struct ip *)->ip_p;
if (proto != IPPROTO_IPV6) {
m_freem(m);
return;
}
ip = mtod(m, struct ip *);
sc = (struct stf_softc *)encap_getarg(m);
if (sc == NULL || (STF2IFP(sc)->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
ifp = STF2IFP(sc);
#ifdef MAC
mac_ifnet_create_mbuf(ifp, m);
#endif
#if STF_DEBUG > 3
{
char buf[INET6_ADDRSTRLEN + 1];
memset(&buf, 0, sizeof(buf));
ip_sprintf(buf, &ip->ip_dst);
DEBUG_PRINTF(1, "%s: ip->ip_dst = %s\n", __func__, buf);
ip_sprintf(buf, &ip->ip_src);
DEBUG_PRINTF(1, "%s: ip->ip_src = %s\n", __func__, buf);
}
#endif
/*
* perform sanity check against outer src/dst.
* for source, perform ingress filter as well.
*/
if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 ||
stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) {
m_freem(m);
return;
}
otos = ip->ip_tos;
m_adj(m, off);
if (m->m_len < sizeof(*ip6)) {
m = m_pullup(m, sizeof(*ip6));
if (!m)
return;
}
ip6 = mtod(m, struct ip6_hdr *);
#if STF_DEBUG > 3
{
char buf[INET6_ADDRSTRLEN + 1];
memset(&buf, 0, sizeof(buf));
ip6_sprintf(buf, &ip6->ip6_dst);
DEBUG_PRINTF(1, "%s: ip6->ip6_dst = %s\n", __func__, buf);
ip6_sprintf(buf, &ip6->ip6_src);
DEBUG_PRINTF(1, "%s: ip6->ip6_src = %s\n", __func__, buf);
}
#endif
/*
* perform sanity check against inner src/dst.
* for source, perform ingress filter as well.
*/
if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 ||
stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) {
m_freem(m);
return;
}
/*
* reject packets with private address range.
* (requirement from RFC3056 section 2 1st paragraph)
*/
if ((IN6_IS_ADDR_6TO4(&ip6->ip6_src) && isrfc1918addr(&ip->ip_src)) ||
(IN6_IS_ADDR_6TO4(&ip6->ip6_dst) && isrfc1918addr(&ip->ip_dst))) {
m_freem(m);
return;
}
/*
* Ignore if the destination is the same stf interface because
* all of valid IPv6 outgoing traffic should go interfaces
* except for it.
*/
memset(&rin6, 0, sizeof(rin6));
rin6.ro_dst.sin6_len = sizeof(rin6.ro_dst);
rin6.ro_dst.sin6_family = AF_INET6;
memcpy(&rin6.ro_dst.sin6_addr, &ip6->ip6_dst,
sizeof(rin6.ro_dst.sin6_addr));
rtalloc((struct route *)&rin6);
if (rin6.ro_rt == NULL) {
DEBUG_PRINTF(1, "%s: no IPv6 dst. Ignored.\n", __func__);
m_free(m);
return;
}
if ((rin6.ro_rt->rt_ifp == ifp) &&
(!IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &rin6.ro_dst.sin6_addr))) {
DEBUG_PRINTF(1, "%s: IPv6 dst is the same stf. Ignored.\n", __func__);
RTFREE(rin6.ro_rt);
m_free(m);
return;
}
RTFREE(rin6.ro_rt);
itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
if ((ifp->if_flags & IFF_LINK1) != 0)
ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
else
ip_ecn_egress(ECN_NOCARE, &otos, &itos);
ip6->ip6_flow &= ~htonl(0xff << 20);
ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
m->m_pkthdr.rcvif = ifp;
if (bpf_peers_present(ifp->if_bpf)) {
/*
* We need to prepend the address family as
* a four byte field. Cons up a dummy header
* to pacify bpf. This is safe because bpf
* will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer a to it).
*/
u_int32_t af = AF_INET6;
bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
}
DEBUG_PRINTF(1, "%s: netisr_dispatch(NETISR_IPV6)\n", __func__);
/*
* Put the packet to the network layer input queue according to the
* specified address family.
* See net/if_gif.c for possible issues with packet processing
* reorder due to extra queueing.
*/
ifp->if_ipackets++;
ifp->if_ibytes += m->m_pkthdr.len;
M_SETFIB(m, ifp->if_fib);
netisr_dispatch(NETISR_IPV6, m);
}
/* ARGSUSED */
static void
stf_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
{
RT_LOCK_ASSERT(rt);
rt->rt_mtu = rt->rt_ifp->if_mtu;
}
static struct sockaddr_in *
stf_getin4addr_in6(struct stf_softc *sc, struct sockaddr_in *sin,
struct ifaddr *ifa,
const struct in6_addr *in6)
{
struct sockaddr_in6 sin6;
DEBUG_PRINTF(1, "%s: enter.\n", __func__);
if (ifa == NULL || in6 == NULL)
return NULL;
memset(&sin6, 0, sizeof(sin6));
memcpy(&sin6.sin6_addr, in6, sizeof(sin6.sin6_addr));
sin6.sin6_len = sizeof(sin6);
sin6.sin6_family = AF_INET6;
return(stf_getin4addr_sin6(sc, sin, ifa, &sin6));
}
static struct sockaddr_in *
stf_getin4addr_sin6(struct stf_softc *sc, struct sockaddr_in *sin,
struct ifaddr *ifa,
struct sockaddr_in6 *sin6)
{
struct in6_ifaddr ia6;
int i;
DEBUG_PRINTF(1, "%s: enter.\n", __func__);
if (ifa == NULL || sin6 == NULL)
return NULL;
memset(&ia6, 0, sizeof(ia6));
memcpy(&ia6, ifatoia6(ifa), sizeof(ia6));
/*
* Use prefixmask information from ifa, and
* address information from sin6.
*/
ia6.ia_addr.sin6_family = AF_INET6;
ia6.ia_ifa.ifa_addr = (struct sockaddr *)&ia6.ia_addr;
ia6.ia_ifa.ifa_dstaddr = NULL;
ia6.ia_ifa.ifa_netmask = (struct sockaddr *)&ia6.ia_prefixmask;
#if STF_DEBUG > 3
{
char buf[INET6_ADDRSTRLEN + 1];
memset(&buf, 0, sizeof(buf));
ip6_sprintf(buf, &sin6->sin6_addr);
DEBUG_PRINTF(1, "%s: sin6->sin6_addr = %s\n", __func__, buf);
ip6_sprintf(buf, &ia6.ia_addr.sin6_addr);
DEBUG_PRINTF(1, "%s: ia6.ia_addr.sin6_addr = %s\n", __func__, buf);
ip6_sprintf(buf, &ia6.ia_prefixmask.sin6_addr);
DEBUG_PRINTF(1, "%s: ia6.ia_prefixmask.sin6_addr = %s\n", __func__, buf);
}
#endif
/*
* When (src addr & src mask) != (dst (sin6) addr & src mask),
* the dst is not in the 6rd domain. The IPv4 address must
* not be used.
*/
for (i = 0; i < sizeof(ia6.ia_addr.sin6_addr); i++) {
if ((((u_char *)&ia6.ia_addr.sin6_addr)[i] &
((u_char *)&ia6.ia_prefixmask.sin6_addr)[i])
!=
(((u_char *)&sin6->sin6_addr)[i] &
((u_char *)&ia6.ia_prefixmask.sin6_addr)[i]))
return NULL;
}
/* After the mask check, overwrite ia6.ia_addr with sin6. */
memcpy(&ia6.ia_addr, sin6, sizeof(ia6.ia_addr));
return(stf_getin4addr(sc, sin, (struct ifaddr *)&ia6, 0));
}
static struct sockaddr_in *
stf_getin4addr(struct stf_softc *sc, struct sockaddr_in *sin,
struct ifaddr *ifa,
int flags)
{
struct in_addr *in;
struct sockaddr_in6 *sin6;
struct in6_ifaddr *ia6;
DEBUG_PRINTF(1, "%s: enter.\n", __func__);
if (ifa == NULL ||
ifa->ifa_addr == NULL ||
ifa->ifa_addr->sa_family != AF_INET6)
return NULL;
sin6 = satosin6(ifa->ifa_addr);
ia6 = ifatoia6(ifa);
if ((flags & STF_GETIN4_USE_CACHE) &&
(ifa->ifa_dstaddr != NULL) &&
(ifa->ifa_dstaddr->sa_family == AF_INET)) {
/*
* XXX: ifa_dstaddr is used as a cache of the
* extracted IPv4 address.
*/
memcpy(sin, satosin(ifa->ifa_dstaddr), sizeof(*sin));
#if STF_DEBUG > 3
{
char tmpbuf[INET6_ADDRSTRLEN + 1];
memset(&tmpbuf, 0, INET6_ADDRSTRLEN);
ip_sprintf(tmpbuf, &sin->sin_addr);
DEBUG_PRINTF(1, "%s: cached address was used = %s\n", __func__, tmpbuf);
}
#endif
return (sin);
}
memset(sin, 0, sizeof(*sin));
in = &sin->sin_addr;
#if STF_DEBUG > 3
{
char tmpbuf[INET6_ADDRSTRLEN + 1];
memset(&tmpbuf, 0, INET6_ADDRSTRLEN);
ip6_sprintf(tmpbuf, &sin6->sin6_addr);
DEBUG_PRINTF(1, "%s: sin6->sin6_addr = %s\n", __func__, tmpbuf);
}
#endif
if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) {
/* 6to4 (RFC 3056) */
bcopy(GET_V4(&sin6->sin6_addr), in, sizeof(*in));
if (isrfc1918addr(in))
return NULL;
} else {
/* 6rd (RFC 5569) */
struct in6_addr buf;
u_char *p = (u_char *)&buf;
u_char *q = (u_char *)&in->s_addr;
u_int residue = 0, v4residue = 0;
u_char mask, v4mask = 0;
int i, j;
u_int plen, loop;
/*
* 6rd-relays IPv6 prefix is located at a 32-bit just
* after the prefix edge.
*/
plen = in6_mask2len(&satosin6(ifa->ifa_netmask)->sin6_addr, NULL);
if (64 < plen) {
DEBUG_PRINTF(1, "prefixlen is %d\n", plen);
return NULL;
}
loop = 4; /* Normal 6rd operation */
memcpy(&buf, &sin6->sin6_addr, sizeof(buf));
if (sc->v4prefixlen != 0 && sc->v4prefixlen != 32) {
v4residue = sc->v4prefixlen % 8;
}
p += plen / 8;
//plen -= 32;
residue = plen % 8;
mask = ((u_char)(-1) >> (8 - residue));
if (v4residue) {
loop++;
v4mask = ((u_char)(-1) << v4residue);
}
/*
* The p points head of the IPv4 address part in
* bytes. The residue is a bit-shift factor when
* prefixlen is not a multiple of 8.
*/
DEBUG_PRINTF(2, "residue = %d 0x%x\n", residue, mask);
for (j = 0, i = (loop - (sc->v4prefixlen / 8)); i < loop; j++, i++) {
if (residue) {
q[i] = ((p[j] & mask) << (8 - residue));
q[i] |= ((p[j + 1] >> residue) & mask);
DEBUG_PRINTF(2, "FINAL i = %d q[%d] - p[%d/%d] %x\n",
i, q[i], p[j], p[j + 1] >> residue, q[i]);
} else {
q[i] = p[j];
DEBUG_PRINTF(2, "FINAL q[%d] - p[%d] %x\n",
q[i], p[j], q[i]);
}
}
if (v4residue) {
q[loop - (sc->v4prefixlen / 8)] &= v4mask;
if (sc->v4prefixlen > 0 && sc->v4prefixlen < 32)
in->s_addr |= sc->inaddr;
}
//if (in->s_addr != sc->srcv4_addr)
// printf("Wrong decoded address %x/%x!!!!\n", in->s_addr, sc->srcv4_addr);
}
#if STF_DEBUG > 3
{
char tmpbuf[INET6_ADDRSTRLEN + 1];
memset(&tmpbuf, 0, INET_ADDRSTRLEN);
ip_sprintf(tmpbuf, in);
DEBUG_PRINTF(1, "%s: in->in_addr = %s\n", __func__, tmpbuf);
DEBUG_PRINTF(1, "%s: leave\n", __func__);
}
#endif
if (flags & STF_GETIN4_USE_CACHE) {
DEBUG_PRINTF(1, "%s: try to access ifa->ifa_dstaddr.\n", __func__);
ifa->ifa_dstaddr = (struct sockaddr *)&ia6->ia_dstaddr;
DEBUG_PRINTF(1, "%s: try to memset 0 to ia_dstaddr.\n", __func__);
memset(&ia6->ia_dstaddr, 0, sizeof(ia6->ia_dstaddr));
DEBUG_PRINTF(1, "%s: try to memcpy ifa->ifa_dstaddr.\n", __func__);
memcpy((struct sockaddr_in *)ifa->ifa_dstaddr,
sin, sizeof(struct sockaddr_in));
DEBUG_PRINTF(1, "%s: try to set sa_family.\n", __func__);
ifa->ifa_dstaddr->sa_family = AF_INET;
DEBUG_PRINTF(1, "%s: in->in_addr is stored in ifa_dstaddr.\n",
__func__);
}
return (sin);
}
static int
stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct stf_softc *sc, *sc_cur;
struct ifaddr *ifa;
struct ifreq *ifr;
struct sockaddr_in in4;
struct stfv4args args;
struct in6_ifaddr *ia6;
struct ifdrv *ifd;
int error, mtu;
error = 0;
sc_cur = ifp->if_softc;
switch (cmd) {
case SIOCSDRVSPEC:
ifd = (struct ifdrv *) data;
error = priv_check(curthread, PRIV_NET_ADDIFADDR);
if (error)
break;
if (ifd->ifd_cmd == STF_SV4NET) {
if (ifd->ifd_len != sizeof(args)) {
error = EINVAL;
break;
}
mtx_lock(&stf_mtx);
LIST_FOREACH(sc, &V_stf_softc_list, stf_list) {
if (sc == sc_cur)
continue;
if (sc->inaddr == 0 || sc->v4prefixlen == 0)
continue;
if ((ntohl(sc->inaddr) & ((uint32_t)(-1) << sc_cur->v4prefixlen)) == ntohl(sc_cur->inaddr)) {
error = EEXIST;
mtx_unlock(&stf_mtx);
return (error);
}
if ((ntohl(sc_cur->inaddr) & ((uint32_t)(-1) << sc->v4prefixlen)) == ntohl(sc->inaddr)) {
error = EEXIST;
mtx_unlock(&stf_mtx);
return (error);
}
}
mtx_unlock(&stf_mtx);
bzero(&args, sizeof args);
error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
if (error)
break;
sc_cur->srcv4_addr = args.inaddr.s_addr;
sc_cur->inaddr = ntohl(args.inaddr.s_addr);
sc_cur->inaddr &= ((uint32_t)(-1) << args.prefix);
sc_cur->inaddr = htonl(sc_cur->inaddr);
sc_cur->v4prefixlen = args.prefix;
if (sc_cur->v4prefixlen == 0)
sc_cur->v4prefixlen = 32;
} else if (ifd->ifd_cmd == STF_SDSTV4) {
if (ifd->ifd_len != sizeof(args)) {
error = EINVAL;
break;
}
bzero(&args, sizeof args);
error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
if (error)
break;
sc_cur->dstv4_addr = args.dstv4_addr.s_addr;
} else
error = EINVAL;
break;
case SIOCGDRVSPEC:
ifd = (struct ifdrv *) data;
if (ifd->ifd_len != sizeof(args)) {
error = EINVAL;
break;
}
if (ifd->ifd_cmd != STF_GV4NET) {
error = EINVAL;
break;
}
bzero(&args, sizeof args);
args.inaddr.s_addr = sc_cur->srcv4_addr;
args.dstv4_addr.s_addr = sc_cur->dstv4_addr;
args.prefix = sc_cur->v4prefixlen;
error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
break;
case SIOCSIFADDR:
ifa = (struct ifaddr *)data;
if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) {
error = EAFNOSUPPORT;
break;
}
if (stf_getin4addr(sc_cur, &in4, ifa, 0) == NULL) {
error = EINVAL;
break;
}
/*
* Sanity check: if more than two interfaces have IFF_UP, do
* if_down() for all of them except for the specified one.
*/
mtx_lock(&stf_mtx);
LIST_FOREACH(sc, &V_stf_softc_list, stf_list) {
if (sc == sc_cur)
continue;
if ((ia6 = stf_getsrcifa6(sc->sc_ifp)) == NULL)
continue;
if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &ifatoia6(ifa)->ia_addr.sin6_addr)) {
error = EEXIST;
ifa_free(&ia6->ia_ifa);
break;
}
ifa_free(&ia6->ia_ifa);
}
mtx_unlock(&stf_mtx);
/*
* XXX: ifa_dstaddr is used as a cache of the
* extracted IPv4 address.
*/
if (ifa->ifa_dstaddr != NULL)
ifa->ifa_dstaddr->sa_family = AF_UNSPEC;
ifa->ifa_rtrequest = stf_rtrequest;
ifp->if_flags |= IFF_UP;
ifp->if_drv_flags |= IFF_DRV_RUNNING;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
ifr = (struct ifreq *)data;
if (ifr && ifr->ifr_addr.sa_family == AF_INET6)
;
else
error = EAFNOSUPPORT;
break;
case SIOCGIFMTU:
break;
case SIOCSIFMTU:
ifr = (struct ifreq *)data;
mtu = ifr->ifr_mtu;
/* RFC 4213 3.2 ideal world MTU */
if (mtu < IPV6_MINMTU || mtu > IF_MAXMTU - 20)
return (EINVAL);
ifp->if_mtu = mtu;
break;
default:
error = EINVAL;
break;
}
return error;
}