1317 lines
34 KiB
C
1317 lines
34 KiB
C
/* $NetBSD: ip6_input.c,v 1.9 1999/12/13 15:17:22 itojun Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 1982, 1986, 1988, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)ip_input.c 8.2 (Berkeley) 1/4/94
|
|
*/
|
|
|
|
#ifdef __FreeBSD__
|
|
#include "opt_ip6fw.h"
|
|
#endif
|
|
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
|
|
#include "opt_inet.h"
|
|
#ifdef __NetBSD__ /*XXX*/
|
|
#include "opt_ipsec.h"
|
|
#endif
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/domain.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/time.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/syslog.h>
|
|
#if !defined(__bsdi__) && !(defined(__FreeBSD__) && __FreeBSD__ < 3)
|
|
#include <sys/proc.h>
|
|
#endif
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_types.h>
|
|
#include <net/if_dl.h>
|
|
#include <net/route.h>
|
|
#include <net/netisr.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#ifdef INET
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_icmp.h>
|
|
#endif /*INET*/
|
|
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802)
|
|
#include <netinet/in_pcb.h>
|
|
#endif
|
|
#include <netinet6/in6_var.h>
|
|
#include <netinet6/ip6.h>
|
|
#if !((defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802))
|
|
#include <netinet6/in6_pcb.h>
|
|
#endif
|
|
#include <netinet6/ip6_var.h>
|
|
#include <netinet6/icmp6.h>
|
|
#include <netinet6/in6_ifattach.h>
|
|
#include <netinet6/nd6.h>
|
|
#include <netinet6/in6_prefix.h>
|
|
|
|
#ifdef IPV6FIREWALL
|
|
#include <netinet6/ip6_fw.h>
|
|
#endif
|
|
|
|
#include <netinet6/ip6protosw.h>
|
|
|
|
/* we need it for NLOOP. */
|
|
#ifndef __bsdi__
|
|
#include "loop.h"
|
|
#endif
|
|
#include "faith.h"
|
|
|
|
#include "gif.h"
|
|
#include "bpfilter.h"
|
|
|
|
#include <net/net_osdep.h>
|
|
|
|
#ifdef __OpenBSD__ /*KAME IPSEC*/
|
|
#undef IPSEC
|
|
#endif
|
|
|
|
extern struct domain inet6domain;
|
|
extern struct ip6protosw inet6sw[];
|
|
#ifdef __bsdi__
|
|
#if _BSDI_VERSION < 199802
|
|
extern struct ifnet loif;
|
|
#else
|
|
extern struct ifnet *loifp;
|
|
#endif
|
|
#endif
|
|
|
|
u_char ip6_protox[IPPROTO_MAX];
|
|
static int ip6qmaxlen = IFQ_MAXLEN;
|
|
struct in6_ifaddr *in6_ifaddr;
|
|
struct ifqueue ip6intrq;
|
|
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__)
|
|
extern struct ifnet loif[NLOOP];
|
|
#endif
|
|
int ip6_forward_srcrt; /* XXX */
|
|
int ip6_sourcecheck; /* XXX */
|
|
int ip6_sourcecheck_interval; /* XXX */
|
|
|
|
#ifdef IPV6FIREWALL
|
|
/* firewall hooks */
|
|
ip6_fw_chk_t *ip6_fw_chk_ptr;
|
|
ip6_fw_ctl_t *ip6_fw_ctl_ptr;
|
|
#endif
|
|
|
|
struct ip6stat ip6stat;
|
|
|
|
static void ip6_init2 __P((void *));
|
|
|
|
static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
|
|
|
|
#if defined(PTR)
|
|
extern int ip6_protocol_tr;
|
|
|
|
int ptr_in6 __P((struct mbuf *, struct mbuf **));
|
|
extern void ip_forward __P((struct mbuf *, int));
|
|
#endif
|
|
|
|
/*
|
|
* IP6 initialization: fill in IP6 protocol switch table.
|
|
* All protocols not implemented in kernel go to raw IP6 protocol handler.
|
|
*/
|
|
void
|
|
ip6_init()
|
|
{
|
|
register struct ip6protosw *pr;
|
|
register int i;
|
|
struct timeval tv;
|
|
|
|
pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
|
|
if (pr == 0)
|
|
panic("ip6_init");
|
|
for (i = 0; i < IPPROTO_MAX; i++)
|
|
ip6_protox[i] = pr - inet6sw;
|
|
for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
|
|
pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
|
|
if (pr->pr_domain->dom_family == PF_INET6 &&
|
|
pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
|
|
ip6_protox[pr->pr_protocol] = pr - inet6sw;
|
|
ip6intrq.ifq_maxlen = ip6qmaxlen;
|
|
nd6_init();
|
|
frag6_init();
|
|
#ifdef IPV6FIREWALL
|
|
ip6_fw_init();
|
|
#endif
|
|
/*
|
|
* in many cases, random() here does NOT return random number
|
|
* as initialization during bootstrap time occur in fixed order.
|
|
*/
|
|
microtime(&tv);
|
|
ip6_flow_seq = random() ^ tv.tv_usec;
|
|
|
|
#ifndef __FreeBSD__
|
|
ip6_init2((void *)0);
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
ip6_init2(dummy)
|
|
void *dummy;
|
|
{
|
|
int ret;
|
|
#if defined(__bsdi__) && _BSDI_VERSION < 199802
|
|
struct ifnet *loifp = &loif;
|
|
#endif
|
|
|
|
/* get EUI64 from somewhere */
|
|
ret = in6_ifattach_getifid(NULL);
|
|
|
|
/*
|
|
* to route local address of p2p link to loopback,
|
|
* assign loopback address first.
|
|
*/
|
|
#ifdef __bsdi__
|
|
in6_ifattach(loifp, IN6_IFT_LOOP, NULL, 0);
|
|
#else
|
|
in6_ifattach(&loif[0], IN6_IFT_LOOP, NULL, 0);
|
|
#endif
|
|
|
|
/* nd6_timer_init */
|
|
timeout(nd6_timer, (caddr_t)0, hz);
|
|
/* router renumbering prefix list maintenance */
|
|
timeout(in6_rr_timer, (caddr_t)0, hz);
|
|
}
|
|
|
|
#ifdef __FreeBSD__
|
|
/* cheat */
|
|
SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init2, NULL);
|
|
#endif
|
|
|
|
/*
|
|
* IP6 input interrupt handling. Just pass the packet to ip6_input.
|
|
*/
|
|
void
|
|
ip6intr()
|
|
{
|
|
int s;
|
|
struct mbuf *m;
|
|
|
|
for (;;) {
|
|
s = splimp();
|
|
IF_DEQUEUE(&ip6intrq, m);
|
|
splx(s);
|
|
if (m == 0)
|
|
return;
|
|
ip6_input(m);
|
|
}
|
|
}
|
|
|
|
#ifdef __FreeBSD__
|
|
NETISR_SET(NETISR_IPV6, ip6intr);
|
|
#endif
|
|
|
|
extern struct route_in6 ip6_forward_rt;
|
|
|
|
void
|
|
ip6_input(m)
|
|
struct mbuf *m;
|
|
{
|
|
struct ip6_hdr *ip6;
|
|
int off = sizeof(struct ip6_hdr), nest;
|
|
u_int32_t plen;
|
|
u_int32_t rtalert = ~0;
|
|
int nxt, ours = 0;
|
|
struct ifnet *deliverifp = NULL;
|
|
#if defined(__bsdi__) && _BSDI_VERSION < 199802
|
|
struct ifnet *loifp = &loif;
|
|
#endif
|
|
|
|
#ifdef IPSEC
|
|
/*
|
|
* should the inner packet be considered authentic?
|
|
* see comment in ah4_input().
|
|
*/
|
|
if (m) {
|
|
m->m_flags &= ~M_AUTHIPHDR;
|
|
m->m_flags &= ~M_AUTHIPDGM;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* mbuf statistics by kazu
|
|
*/
|
|
if (m->m_flags & M_EXT) {
|
|
if (m->m_next)
|
|
ip6stat.ip6s_mext2m++;
|
|
else
|
|
ip6stat.ip6s_mext1++;
|
|
} else {
|
|
if (m->m_next) {
|
|
if (m->m_flags & M_LOOP) {
|
|
#ifdef __bsdi__
|
|
ip6stat.ip6s_m2m[loifp->if_index]++; /*XXX*/
|
|
#else
|
|
ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/
|
|
#endif
|
|
}
|
|
else if (m->m_pkthdr.rcvif->if_index <= 31)
|
|
ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
|
|
else
|
|
ip6stat.ip6s_m2m[0]++;
|
|
} else
|
|
ip6stat.ip6s_m1++;
|
|
}
|
|
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
|
|
ip6stat.ip6s_total++;
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
/* XXX is the line really necessary? */
|
|
IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
|
|
#endif
|
|
|
|
if (m->m_len < sizeof(struct ip6_hdr)) {
|
|
struct ifnet *inifp;
|
|
inifp = m->m_pkthdr.rcvif;
|
|
if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
|
|
ip6stat.ip6s_toosmall++;
|
|
in6_ifstat_inc(inifp, ifs6_in_hdrerr);
|
|
return;
|
|
}
|
|
}
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
|
|
ip6stat.ip6s_badvers++;
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
|
|
goto bad;
|
|
}
|
|
|
|
ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
|
|
|
|
#ifdef IPV6FIREWALL
|
|
/*
|
|
* Check with the firewall...
|
|
*/
|
|
if (ip6_fw_chk_ptr) {
|
|
u_short port = 0;
|
|
/* If ipfw says divert, we have to just drop packet */
|
|
/* use port as a dummy argument */
|
|
if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
|
|
m_freem(m);
|
|
m = NULL;
|
|
}
|
|
if (!m)
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Scope check
|
|
*/
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
|
|
IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
|
|
ip6stat.ip6s_badscope++;
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
|
|
goto bad;
|
|
}
|
|
if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
|
|
IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
|
|
if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
|
|
ours = 1;
|
|
deliverifp = m->m_pkthdr.rcvif;
|
|
goto hbhcheck;
|
|
} else {
|
|
ip6stat.ip6s_badscope++;
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
|
|
if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
|
|
ours = 1;
|
|
deliverifp = m->m_pkthdr.rcvif;
|
|
goto hbhcheck;
|
|
}
|
|
} else {
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
|
|
ip6->ip6_src.s6_addr16[1]
|
|
= htons(m->m_pkthdr.rcvif->if_index);
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
|
|
ip6->ip6_dst.s6_addr16[1]
|
|
= htons(m->m_pkthdr.rcvif->if_index);
|
|
}
|
|
|
|
#if defined(PTR)
|
|
/*
|
|
*
|
|
*/
|
|
if (ip6_protocol_tr)
|
|
{
|
|
struct mbuf *m1 = NULL;
|
|
|
|
switch (ptr_in6(m, &m1))
|
|
{
|
|
case IPPROTO_IP: goto mcastcheck;
|
|
case IPPROTO_IPV4: ip_forward(m1, 0); break;
|
|
case IPPROTO_IPV6: ip6_forward(m1, 0); break;
|
|
case IPPROTO_MAX: /* discard this packet */
|
|
default:
|
|
}
|
|
|
|
if (m != m1)
|
|
m_freem(m);
|
|
|
|
return;
|
|
}
|
|
|
|
mcastcheck:
|
|
#endif
|
|
|
|
/*
|
|
* Multicast check
|
|
*/
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
struct in6_multi *in6m = 0;
|
|
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
|
|
/*
|
|
* See if we belong to the destination multicast group on the
|
|
* arrival interface.
|
|
*/
|
|
IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
|
|
if (in6m)
|
|
ours = 1;
|
|
else if (!ip6_mrouter) {
|
|
ip6stat.ip6s_notmember++;
|
|
ip6stat.ip6s_cantforward++;
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
|
|
goto bad;
|
|
}
|
|
deliverifp = m->m_pkthdr.rcvif;
|
|
goto hbhcheck;
|
|
}
|
|
|
|
/*
|
|
* Unicast check
|
|
*/
|
|
if (ip6_forward_rt.ro_rt == 0 ||
|
|
!IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
|
|
&ip6_forward_rt.ro_dst.sin6_addr)) {
|
|
if (ip6_forward_rt.ro_rt) {
|
|
RTFREE(ip6_forward_rt.ro_rt);
|
|
ip6_forward_rt.ro_rt = 0;
|
|
}
|
|
bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
|
|
ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
|
|
ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
|
|
ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
|
|
|
|
#ifdef __FreeBSD__
|
|
rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
|
|
#else
|
|
rtalloc((struct route *)&ip6_forward_rt);
|
|
#endif
|
|
}
|
|
|
|
#define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
|
|
|
|
/*
|
|
* Accept the packet if the forwarding interface to the destination
|
|
* according to the routing table is the loopback interface,
|
|
* unless the associated route has a gateway.
|
|
* Note that this approach causes to accept a packet if there is a
|
|
* route to the loopback interface for the destination of the packet.
|
|
* But we think it's even useful in some situations, e.g. when using
|
|
* a special daemon which wants to intercept the packet.
|
|
*/
|
|
if (ip6_forward_rt.ro_rt &&
|
|
(ip6_forward_rt.ro_rt->rt_flags &
|
|
(RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
|
|
#if 0
|
|
/*
|
|
* The check below is redundant since the comparison of
|
|
* the destination and the key of the rtentry has
|
|
* already done through looking up the routing table.
|
|
*/
|
|
IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
|
|
&rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
|
|
#endif
|
|
ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
|
|
struct in6_ifaddr *ia6 =
|
|
(struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
|
|
/* packet to tentative address must not be received */
|
|
if (ia6->ia6_flags & IN6_IFF_ANYCAST)
|
|
m->m_flags |= M_ANYCAST6;
|
|
if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
|
|
/* this interface is ready */
|
|
ours = 1;
|
|
deliverifp = ia6->ia_ifp; /* correct? */
|
|
goto hbhcheck;
|
|
} else {
|
|
/* this interface is not ready, fall through */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* FAITH(Firewall Aided Internet Translator)
|
|
*/
|
|
#if defined(NFAITH) && 0 < NFAITH
|
|
if (ip6_keepfaith) {
|
|
if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
|
|
&& ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
|
|
/* XXX do we need more sanity checks? */
|
|
ours = 1;
|
|
deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
|
|
goto hbhcheck;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if 0
|
|
{
|
|
/*
|
|
* Last resort: check in6_ifaddr for incoming interface.
|
|
* The code is here until I update the "goto ours hack" code above
|
|
* working right.
|
|
*/
|
|
struct ifaddr *ifa;
|
|
for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
|
|
ifa;
|
|
ifa = ifa->ifa_list.tqe_next) {
|
|
if (ifa->ifa_addr == NULL)
|
|
continue; /* just for safety */
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
|
|
ours = 1;
|
|
deliverifp = ifa->ifa_ifp;
|
|
goto hbhcheck;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Now there is no reason to process the packet if it's not our own
|
|
* and we're not a router.
|
|
*/
|
|
if (!ip6_forwarding) {
|
|
ip6stat.ip6s_cantforward++;
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
|
|
goto bad;
|
|
}
|
|
|
|
hbhcheck:
|
|
/*
|
|
* Process Hop-by-Hop options header if it's contained.
|
|
* m may be modified in ip6_hopopts_input().
|
|
* If a JumboPayload option is included, plen will also be modified.
|
|
*/
|
|
plen = (u_int32_t)ntohs(ip6->ip6_plen);
|
|
if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
|
|
struct ip6_hbh *hbh;
|
|
|
|
if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
|
|
#if 0 /*touches NULL pointer*/
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
|
|
#endif
|
|
return; /* m have already been freed */
|
|
}
|
|
/* adjust pointer */
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
#ifndef PULLDOWN_TEST
|
|
/* ip6_hopopts_input() ensures that mbuf is contiguous */
|
|
hbh = (struct ip6_hbh *)(ip6 + 1);
|
|
#else
|
|
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
|
|
sizeof(struct ip6_hbh));
|
|
if (hbh == NULL) {
|
|
ip6stat.ip6s_tooshort++;
|
|
return;
|
|
}
|
|
#endif
|
|
nxt = hbh->ip6h_nxt;
|
|
|
|
/*
|
|
* accept the packet if a router alert option is included
|
|
* and we act as an IPv6 router.
|
|
*/
|
|
if (rtalert != ~0 && ip6_forwarding)
|
|
ours = 1;
|
|
} else
|
|
nxt = ip6->ip6_nxt;
|
|
|
|
/*
|
|
* Check that the amount of data in the buffers
|
|
* is as at least much as the IPv6 header would have us expect.
|
|
* Trim mbufs if longer than we expect.
|
|
* Drop packet if shorter than we expect.
|
|
*/
|
|
if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
|
|
ip6stat.ip6s_tooshort++;
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
|
|
goto bad;
|
|
}
|
|
if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
|
|
if (m->m_len == m->m_pkthdr.len) {
|
|
m->m_len = sizeof(struct ip6_hdr) + plen;
|
|
m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
|
|
} else
|
|
m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
|
|
}
|
|
|
|
/*
|
|
* Forward if desirable.
|
|
*/
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
/*
|
|
* If we are acting as a multicast router, all
|
|
* incoming multicast packets are passed to the
|
|
* kernel-level multicast forwarding function.
|
|
* The packet is returned (relatively) intact; if
|
|
* ip6_mforward() returns a non-zero value, the packet
|
|
* must be discarded, else it may be accepted below.
|
|
*/
|
|
if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
|
|
ip6stat.ip6s_cantforward++;
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
if (!ours) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
}
|
|
else if (!ours) {
|
|
ip6_forward(m, 0);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Tell launch routine the next header
|
|
*/
|
|
#if defined(__NetBSD__) && defined(IFA_STATS)
|
|
if (IFA_STATS && deliverifp != NULL) {
|
|
struct in6_ifaddr *ia6;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
|
|
if (ia6)
|
|
ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
|
|
}
|
|
#endif
|
|
ip6stat.ip6s_delivered++;
|
|
in6_ifstat_inc(deliverifp, ifs6_in_deliver);
|
|
nest = 0;
|
|
while (nxt != IPPROTO_DONE) {
|
|
if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
|
|
ip6stat.ip6s_toomanyhdr++;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* protection against faulty packet - there should be
|
|
* more sanity checks in header chain processing.
|
|
*/
|
|
if (m->m_pkthdr.len < off) {
|
|
ip6stat.ip6s_tooshort++;
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
|
|
goto bad;
|
|
}
|
|
|
|
nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
|
|
}
|
|
return;
|
|
bad:
|
|
m_freem(m);
|
|
}
|
|
|
|
/*
|
|
* Hop-by-Hop options header processing. If a valid jumbo payload option is
|
|
* included, the real payload length will be stored in plenp.
|
|
*/
|
|
static int
|
|
ip6_hopopts_input(plenp, rtalertp, mp, offp)
|
|
u_int32_t *plenp;
|
|
u_int32_t *rtalertp; /* XXX: should be stored more smart way */
|
|
struct mbuf **mp;
|
|
int *offp;
|
|
{
|
|
register struct mbuf *m = *mp;
|
|
int off = *offp, hbhlen;
|
|
struct ip6_hbh *hbh;
|
|
u_int8_t *opt;
|
|
|
|
/* validation of the length of the header */
|
|
#ifndef PULLDOWN_TEST
|
|
IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
|
|
hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
|
|
hbhlen = (hbh->ip6h_len + 1) << 3;
|
|
|
|
IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
|
|
hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
|
|
#else
|
|
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
|
|
sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
|
|
if (hbh == NULL) {
|
|
ip6stat.ip6s_tooshort++;
|
|
return -1;
|
|
}
|
|
hbhlen = (hbh->ip6h_len + 1) << 3;
|
|
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
|
|
hbhlen);
|
|
if (hbh == NULL) {
|
|
ip6stat.ip6s_tooshort++;
|
|
return -1;
|
|
}
|
|
#endif
|
|
off += hbhlen;
|
|
hbhlen -= sizeof(struct ip6_hbh);
|
|
opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
|
|
|
|
if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
|
|
hbhlen, rtalertp, plenp) < 0)
|
|
return(-1);
|
|
|
|
*offp = off;
|
|
*mp = m;
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Search header for all Hop-by-hop options and process each option.
|
|
* This function is separate from ip6_hopopts_input() in order to
|
|
* handle a case where the sending node itself process its hop-by-hop
|
|
* options header. In such a case, the function is called from ip6_output().
|
|
*/
|
|
int
|
|
ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
|
|
struct mbuf *m;
|
|
u_int8_t *opthead;
|
|
int hbhlen;
|
|
u_int32_t *rtalertp;
|
|
u_int32_t *plenp;
|
|
{
|
|
struct ip6_hdr *ip6;
|
|
int optlen = 0;
|
|
u_int8_t *opt = opthead;
|
|
u_int16_t rtalert_val;
|
|
|
|
for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
|
|
switch(*opt) {
|
|
case IP6OPT_PAD1:
|
|
optlen = 1;
|
|
break;
|
|
case IP6OPT_PADN:
|
|
if (hbhlen < IP6OPT_MINLEN) {
|
|
ip6stat.ip6s_toosmall++;
|
|
goto bad;
|
|
}
|
|
optlen = *(opt + 1) + 2;
|
|
break;
|
|
case IP6OPT_RTALERT:
|
|
/* XXX may need check for alignment */
|
|
if (hbhlen < IP6OPT_RTALERT_LEN) {
|
|
ip6stat.ip6s_toosmall++;
|
|
goto bad;
|
|
}
|
|
if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
|
|
/* XXX: should we discard the packet? */
|
|
log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
|
|
*(opt + 1));
|
|
optlen = IP6OPT_RTALERT_LEN;
|
|
bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
|
|
*rtalertp = ntohs(rtalert_val);
|
|
break;
|
|
case IP6OPT_JUMBO:
|
|
/* XXX may need check for alignment */
|
|
if (hbhlen < IP6OPT_JUMBO_LEN) {
|
|
ip6stat.ip6s_toosmall++;
|
|
goto bad;
|
|
}
|
|
if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
|
|
/* XXX: should we discard the packet? */
|
|
log(LOG_ERR, "length of jumbopayload opt "
|
|
"is inconsistent(%d)",
|
|
*(opt + 1));
|
|
optlen = IP6OPT_JUMBO_LEN;
|
|
|
|
/*
|
|
* We can simply cast because of the alignment
|
|
* requirement of the jumbo payload option.
|
|
*/
|
|
#if 0
|
|
*plenp = ntohl(*(u_int32_t *)(opt + 2));
|
|
#else
|
|
bcopy(opt + 2, plenp, sizeof(*plenp));
|
|
*plenp = htonl(*plenp);
|
|
#endif
|
|
if (*plenp <= IPV6_MAXPACKET) {
|
|
/*
|
|
* jumbo payload length must be larger
|
|
* than 65535
|
|
*/
|
|
ip6stat.ip6s_badoptions++;
|
|
icmp6_error(m, ICMP6_PARAM_PROB,
|
|
ICMP6_PARAMPROB_HEADER,
|
|
sizeof(struct ip6_hdr) +
|
|
sizeof(struct ip6_hbh) +
|
|
opt + 2 - opthead);
|
|
return(-1);
|
|
}
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
if (ip6->ip6_plen) {
|
|
/*
|
|
* IPv6 packets that have non 0 payload length
|
|
* must not contain a jumbo paylod option.
|
|
*/
|
|
ip6stat.ip6s_badoptions++;
|
|
icmp6_error(m, ICMP6_PARAM_PROB,
|
|
ICMP6_PARAMPROB_HEADER,
|
|
sizeof(struct ip6_hdr) +
|
|
sizeof(struct ip6_hbh) +
|
|
opt - opthead);
|
|
return(-1);
|
|
}
|
|
break;
|
|
default: /* unknown option */
|
|
if (hbhlen < IP6OPT_MINLEN) {
|
|
ip6stat.ip6s_toosmall++;
|
|
goto bad;
|
|
}
|
|
if ((optlen = ip6_unknown_opt(opt, m,
|
|
sizeof(struct ip6_hdr) +
|
|
sizeof(struct ip6_hbh) +
|
|
opt - opthead)) == -1)
|
|
return(-1);
|
|
optlen += 2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return(0);
|
|
|
|
bad:
|
|
m_freem(m);
|
|
return(-1);
|
|
}
|
|
|
|
/*
|
|
* Unknown option processing.
|
|
* The third argument `off' is the offset from the IPv6 header to the option,
|
|
* which is necessary if the IPv6 header the and option header and IPv6 header
|
|
* is not continuous in order to return an ICMPv6 error.
|
|
*/
|
|
int
|
|
ip6_unknown_opt(optp, m, off)
|
|
u_int8_t *optp;
|
|
struct mbuf *m;
|
|
int off;
|
|
{
|
|
struct ip6_hdr *ip6;
|
|
|
|
switch(IP6OPT_TYPE(*optp)) {
|
|
case IP6OPT_TYPE_SKIP: /* ignore the option */
|
|
return((int)*(optp + 1));
|
|
case IP6OPT_TYPE_DISCARD: /* silently discard */
|
|
m_freem(m);
|
|
return(-1);
|
|
case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
|
|
ip6stat.ip6s_badoptions++;
|
|
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
|
|
return(-1);
|
|
case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
|
|
ip6stat.ip6s_badoptions++;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
|
|
(m->m_flags & (M_BCAST|M_MCAST)))
|
|
m_freem(m);
|
|
else
|
|
icmp6_error(m, ICMP6_PARAM_PROB,
|
|
ICMP6_PARAMPROB_OPTION, off);
|
|
return(-1);
|
|
}
|
|
|
|
m_freem(m); /* XXX: NOTREACHED */
|
|
return(-1);
|
|
}
|
|
|
|
/*
|
|
* Create the "control" list for this pcb.
|
|
*
|
|
* The routine will be called from upper layer handlers like tcp6_input().
|
|
* Thus the routine assumes that the caller (tcp6_input) have already
|
|
* called IP6_EXTHDR_CHECK() and all the extension headers are located in the
|
|
* very first mbuf on the mbuf chain.
|
|
* We may want to add some infinite loop prevention or sanity checks for safety.
|
|
* (This applies only when you are using KAME mbuf chain restriction, i.e.
|
|
* you are using IP6_EXTHDR_CHECK() not m_pulldown())
|
|
*/
|
|
void
|
|
ip6_savecontrol(in6p, mp, ip6, m)
|
|
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(HAVE_NRL_INPCB)
|
|
register struct inpcb *in6p;
|
|
#else
|
|
register struct in6pcb *in6p;
|
|
#endif
|
|
register struct mbuf **mp;
|
|
register struct ip6_hdr *ip6;
|
|
register struct mbuf *m;
|
|
{
|
|
#ifdef HAVE_NRL_INPCB
|
|
# define in6p_flags inp_flags
|
|
#endif
|
|
#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
|
|
struct proc *p = curproc; /* XXX */
|
|
#endif
|
|
#ifdef __bsdi__
|
|
# define sbcreatecontrol so_cmsg
|
|
#endif
|
|
int privileged;
|
|
|
|
privileged = 0;
|
|
#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
|
|
if (p && !suser(p->p_ucred, &p->p_acflag))
|
|
privileged++;
|
|
#else
|
|
#ifdef HAVE_NRL_INPCB
|
|
if ((in6p->inp_socket->so_state & SS_PRIV) != 0)
|
|
privileged++;
|
|
#else
|
|
if ((in6p->in6p_socket->so_state & SS_PRIV) != 0)
|
|
privileged++;
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef SO_TIMESTAMP
|
|
if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
|
|
struct timeval tv;
|
|
|
|
microtime(&tv);
|
|
*mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
|
|
SCM_TIMESTAMP, SOL_SOCKET);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
#endif
|
|
if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
|
|
*mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
|
|
sizeof(struct in6_addr), IPV6_RECVDSTADDR,
|
|
IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
|
|
#ifdef noyet
|
|
/* options were tossed above */
|
|
if (in6p->in6p_flags & IN6P_RECVOPTS)
|
|
/* broken */
|
|
/* ip6_srcroute doesn't do what we want here, need to fix */
|
|
if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
|
|
/* broken */
|
|
#endif
|
|
|
|
/* RFC 2292 sec. 5 */
|
|
if (in6p->in6p_flags & IN6P_PKTINFO) {
|
|
struct in6_pktinfo pi6;
|
|
bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
|
|
pi6.ipi6_addr.s6_addr16[1] = 0;
|
|
pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
|
|
? m->m_pkthdr.rcvif->if_index
|
|
: 0;
|
|
*mp = sbcreatecontrol((caddr_t) &pi6,
|
|
sizeof(struct in6_pktinfo), IPV6_PKTINFO,
|
|
IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
if (in6p->in6p_flags & IN6P_HOPLIMIT) {
|
|
int hlim = ip6->ip6_hlim & 0xff;
|
|
*mp = sbcreatecontrol((caddr_t) &hlim,
|
|
sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
/* IN6P_NEXTHOP - for outgoing packet only */
|
|
|
|
/*
|
|
* IPV6_HOPOPTS socket option. We require super-user privilege
|
|
* for the option, but it might be too strict, since there might
|
|
* be some hop-by-hop options which can be returned to normal user.
|
|
* See RFC 2292 section 6.
|
|
*/
|
|
if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
|
|
/*
|
|
* Check if a hop-by-hop options header is contatined in the
|
|
* received packet, and if so, store the options as ancillary
|
|
* data. Note that a hop-by-hop options header must be
|
|
* just after the IPv6 header, which fact is assured through
|
|
* the IPv6 input processing.
|
|
*/
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
|
|
struct ip6_hbh *hbh;
|
|
int hbhlen;
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
hbh = (struct ip6_hbh *)(ip6 + 1);
|
|
hbhlen = (hbh->ip6h_len + 1) << 3;
|
|
#else
|
|
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
|
|
sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
|
|
if (hbh == NULL) {
|
|
ip6stat.ip6s_tooshort++;
|
|
return;
|
|
}
|
|
hbhlen = (hbh->ip6h_len + 1) << 3;
|
|
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
|
|
sizeof(struct ip6_hdr), hbhlen);
|
|
if (hbh == NULL) {
|
|
ip6stat.ip6s_tooshort++;
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* XXX: We copy whole the header even if a jumbo
|
|
* payload option is included, which option is to
|
|
* be removed before returning in the RFC 2292.
|
|
* But it's too painful operation...
|
|
*/
|
|
*mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
|
|
IPV6_HOPOPTS, IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
}
|
|
|
|
/* IPV6_DSTOPTS and IPV6_RTHDR socket options */
|
|
if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
|
|
|
|
/*
|
|
* Search for destination options headers or routing
|
|
* header(s) through the header chain, and stores each
|
|
* header as ancillary data.
|
|
* Note that the order of the headers remains in
|
|
* the chain of ancillary data.
|
|
*/
|
|
while(1) { /* is explicit loop prevention necessary? */
|
|
struct ip6_ext *ip6e;
|
|
int elen;
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
|
|
if (nxt == IPPROTO_AH)
|
|
elen = (ip6e->ip6e_len + 2) << 2;
|
|
else
|
|
elen = (ip6e->ip6e_len + 1) << 3;
|
|
#else
|
|
IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
|
|
sizeof(struct ip6_ext));
|
|
if (ip6e == NULL) {
|
|
ip6stat.ip6s_tooshort++;
|
|
return;
|
|
}
|
|
if (nxt == IPPROTO_AH)
|
|
elen = (ip6e->ip6e_len + 2) << 2;
|
|
else
|
|
elen = (ip6e->ip6e_len + 1) << 3;
|
|
IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
|
|
if (ip6e == NULL) {
|
|
ip6stat.ip6s_tooshort++;
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
switch(nxt) {
|
|
case IPPROTO_DSTOPTS:
|
|
if (!in6p->in6p_flags & IN6P_DSTOPTS)
|
|
break;
|
|
|
|
/*
|
|
* We also require super-user privilege for
|
|
* the option.
|
|
* See the comments on IN6_HOPOPTS.
|
|
*/
|
|
if (!privileged)
|
|
break;
|
|
|
|
*mp = sbcreatecontrol((caddr_t)ip6e, elen,
|
|
IPV6_DSTOPTS,
|
|
IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
break;
|
|
|
|
case IPPROTO_ROUTING:
|
|
if (!in6p->in6p_flags & IN6P_RTHDR)
|
|
break;
|
|
|
|
*mp = sbcreatecontrol((caddr_t)ip6e, elen,
|
|
IPV6_RTHDR,
|
|
IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
break;
|
|
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_ICMPV6:
|
|
default:
|
|
/*
|
|
* stop search if we encounter an upper
|
|
* layer protocol headers.
|
|
*/
|
|
goto loopend;
|
|
|
|
case IPPROTO_HOPOPTS:
|
|
case IPPROTO_AH: /* is it possible? */
|
|
break;
|
|
}
|
|
|
|
/* proceed with the next header. */
|
|
off += elen;
|
|
nxt = ip6e->ip6e_nxt;
|
|
}
|
|
loopend:
|
|
}
|
|
if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
|
|
/* to be done */
|
|
}
|
|
if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
|
|
/* to be done */
|
|
}
|
|
/* IN6P_RTHDR - to be done */
|
|
|
|
#ifdef __bsdi__
|
|
# undef sbcreatecontrol
|
|
#endif
|
|
#ifdef __OpenBSD__
|
|
# undef in6p_flags
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Get pointer to the previous header followed by the header
|
|
* currently processed.
|
|
* XXX: This function supposes that
|
|
* M includes all headers,
|
|
* the next header field and the header length field of each header
|
|
* are valid, and
|
|
* the sum of each header length equals to OFF.
|
|
* Because of these assumptions, this function must be called very
|
|
* carefully. Moreover, it will not be used in the near future when
|
|
* we develop `neater' mechanism to process extension headers.
|
|
*/
|
|
char *
|
|
ip6_get_prevhdr(m, off)
|
|
struct mbuf *m;
|
|
int off;
|
|
{
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
if (off == sizeof(struct ip6_hdr))
|
|
return(&ip6->ip6_nxt);
|
|
else {
|
|
int len, nxt;
|
|
struct ip6_ext *ip6e = NULL;
|
|
|
|
nxt = ip6->ip6_nxt;
|
|
len = sizeof(struct ip6_hdr);
|
|
while (len < off) {
|
|
ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
|
|
|
|
switch(nxt) {
|
|
case IPPROTO_FRAGMENT:
|
|
len += sizeof(struct ip6_frag);
|
|
break;
|
|
case IPPROTO_AH:
|
|
len += (ip6e->ip6e_len + 2) << 2;
|
|
break;
|
|
default:
|
|
len += (ip6e->ip6e_len + 1) << 3;
|
|
break;
|
|
}
|
|
nxt = ip6e->ip6e_nxt;
|
|
}
|
|
if (ip6e)
|
|
return(&ip6e->ip6e_nxt);
|
|
else
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* System control for IP6
|
|
*/
|
|
|
|
u_char inet6ctlerrmap[PRC_NCMDS] = {
|
|
0, 0, 0, 0,
|
|
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
|
|
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
|
|
EMSGSIZE, EHOSTUNREACH, 0, 0,
|
|
0, 0, 0, 0,
|
|
ENOPROTOOPT
|
|
};
|
|
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__)
|
|
#include <vm/vm.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
int
|
|
ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
|
|
int *name;
|
|
u_int namelen;
|
|
void *oldp;
|
|
size_t *oldlenp;
|
|
void *newp;
|
|
size_t newlen;
|
|
{
|
|
/* All sysctl names at this level are terminal. */
|
|
if (namelen != 1)
|
|
return ENOTDIR;
|
|
|
|
switch (name[0]) {
|
|
|
|
case IPV6CTL_FORWARDING:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&ip6_forwarding);
|
|
case IPV6CTL_SENDREDIRECTS:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&ip6_sendredirects);
|
|
case IPV6CTL_DEFHLIM:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
|
|
case IPV6CTL_MAXFRAGPACKETS:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&ip6_maxfragpackets);
|
|
case IPV6CTL_ACCEPT_RTADV:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&ip6_accept_rtadv);
|
|
case IPV6CTL_KEEPFAITH:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
|
|
case IPV6CTL_LOG_INTERVAL:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&ip6_log_interval);
|
|
case IPV6CTL_HDRNESTLIMIT:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&ip6_hdrnestlimit);
|
|
case IPV6CTL_DAD_COUNT:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
|
|
case IPV6CTL_AUTO_FLOWLABEL:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&ip6_auto_flowlabel);
|
|
case IPV6CTL_DEFMCASTHLIM:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&ip6_defmcasthlim);
|
|
case IPV6CTL_GIF_HLIM:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&ip6_gif_hlim);
|
|
case IPV6CTL_KAME_VERSION:
|
|
return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
|
|
case IPV6CTL_USE_DEPRECATED:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&ip6_use_deprecated);
|
|
default:
|
|
return EOPNOTSUPP;
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
#endif /* __NetBSD__ || __OpenBSD__ */
|
|
|
|
#ifdef __bsdi__
|
|
int *ip6_sysvars[] = IPV6CTL_VARS;
|
|
|
|
int
|
|
ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
|
|
int *name;
|
|
u_int namelen;
|
|
void *oldp;
|
|
size_t *oldlenp;
|
|
void *newp;
|
|
size_t newlen;
|
|
{
|
|
if (name[0] >= IPV6CTL_MAXID)
|
|
return (EOPNOTSUPP);
|
|
|
|
switch (name[0]) {
|
|
case IPV6CTL_STATS:
|
|
return sysctl_rdtrunc(oldp, oldlenp, newp, &ip6stat,
|
|
sizeof(ip6stat));
|
|
case IPV6CTL_KAME_VERSION:
|
|
return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
|
|
default:
|
|
return (sysctl_int_arr(ip6_sysvars, name, namelen,
|
|
oldp, oldlenp, newp, newlen));
|
|
}
|
|
}
|
|
#endif /* __bsdi__ */
|