-/* $KAME: ip6_forward.c,v 1.29 2000/02/26 18:08:38 itojun Exp $ */
+/* $FreeBSD: src/sys/netinet6/ip6_forward.c,v 1.16 2002/10/16 02:25:05 sam Exp $ */
+/* $KAME: ip6_forward.c,v 1.69 2001/05/17 03:48:30 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* SUCH DAMAGE.
*/
-#if (defined(__FreeBSD__) && __FreeBSD__ >= 3)
-#include "opt_ip6fw.h"
-#include "opt_inet.h"
-#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
#include <netinet/ip_var.h>
+#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#include <netinet6/nd6.h>
-#if IPSEC_IPV6FWD
+#include <netinet/in_pcb.h>
+
+#if IPSEC
#include <netinet6/ipsec.h>
+#if INET6
+#include <netinet6/ipsec6.h>
+#endif
#include <netkey/key.h>
-#include <netkey/key_debug.h>
-#endif /* IPSEC_IPV6FWD */
+extern int ipsec_bypass;
+#endif /* IPSEC */
-#if IPV6FIREWALL
#include <netinet6/ip6_fw.h>
-#endif
-
-#if MIP6
-#include <netinet6/mip6.h>
-#endif
#include <net/net_osdep.h>
int srcrt;
{
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
- register struct sockaddr_in6 *dst;
- register struct rtentry *rt;
+ struct sockaddr_in6 *dst;
+ struct rtentry *rt;
int error, type = 0, code = 0;
struct mbuf *mcopy = NULL;
-#if IPSEC_IPV6FWD
+ struct ifnet *origifp; /* maybe unnecessary */
+#if IPSEC
struct secpolicy *sp = NULL;
#endif
-#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__APPLE__)
- long time_second = time.tv_sec;
-#endif
-#if IPSEC_IPV6FWD
+#if IPSEC
/*
* Check AH/ESP integrity.
*/
* Don't increment ip6s_cantforward because this is the check
* before forwarding packet actually.
*/
- if (ipsec6_in_reject(m, NULL)) {
+ if (ipsec_bypass == 0 && ipsec6_in_reject(m, NULL)) {
ipsec6stat.in_polvio++;
m_freem(m);
return;
}
-#endif /*IPSEC_IPV6FWD*/
+#endif /*IPSEC*/
+ /*
+ * Do not forward packets to multicast destination (should be handled
+ * by ip6_mforward().
+ * Do not forward packets with unspecified source. It was discussed
+ * in July 2000, on ipngwg mailing list.
+ */
if ((m->m_flags & (M_BCAST|M_MCAST)) != 0 ||
- IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
+ IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
+ IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
ip6stat.ip6s_cantforward++;
/* XXX in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard) */
if (ip6_log_time + ip6_log_interval < time_second) {
*/
mcopy = m_copy(m, 0, imin(m->m_pkthdr.len, ICMPV6_PLD_MAXLEN));
+#if IPSEC
+ if (ipsec_bypass != 0)
+ goto skip_ipsec;
-#if IPSEC_IPV6FWD
/* get a security policy for this packet */
- sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error);
+ sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, IP_FORWARDING,
+ &error);
if (sp == NULL) {
ipsec6stat.out_inval++;
ip6stat.ip6s_cantforward++;
/* no need to do IPsec. */
key_freesp(sp);
goto skip_ipsec;
-
+
case IPSEC_POLICY_IPSEC:
if (sp->req == NULL) {
/* XXX should be panic ? */
error = ipsec6_output_tunnel(&state, sp, 0);
m = state.m;
-#if 0 /* XXX allocate a route (ro, dst) again later */
- ro = (struct route_in6 *)state.ro;
- dst = (struct sockaddr_in6 *)state.dst;
-#endif
key_freesp(sp);
if (error) {
break;
default:
printf("ip6_output (ipsec): error code %d\n", error);
- /*fall through*/
+ /* fall through */
case ENOENT:
/* don't show these error codes to the user */
break;
}
}
skip_ipsec:
-#endif /* IPSEC_IPV6FWD */
-
-#if MIP6
- {
- struct mip6_bc *bc;
-
- bc = mip6_bc_find(&ip6->ip6_dst);
- if ((bc != NULL) && (bc->hr_flag)) {
- if (mip6_tunnel_output(&m, bc) != 0) {
- ip6stat.ip6s_cantforward++;
- if (mcopy)
- m_freem(mcopy);
- m_freem(m);
- return;
- }
- }
- ip6 = mtod(m, struct ip6_hdr *); /* m has changed */
- }
-#endif
-
- dst = &ip6_forward_rt.ro_dst;
+#endif /* IPSEC */
+
+ dst = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
if (!srcrt) {
/*
* ip6_forward_rt.ro_dst.sin6_addr is equal to ip6->ip6_dst
if (ip6_forward_rt.ro_rt == 0 ||
(ip6_forward_rt.ro_rt->rt_flags & RTF_UP) == 0) {
if (ip6_forward_rt.ro_rt) {
- RTFREE(ip6_forward_rt.ro_rt);
+ rtfree(ip6_forward_rt.ro_rt);
ip6_forward_rt.ro_rt = 0;
}
/* this probably fails but give it a try again */
-#if __FreeBSD__ || defined(__APPLE__)
rtalloc_ign((struct route *)&ip6_forward_rt,
RTF_PRCLONING);
-#else
- rtalloc((struct route *)&ip6_forward_rt);
-#endif
}
-
+
if (ip6_forward_rt.ro_rt == 0) {
ip6stat.ip6s_noroute++;
- /* XXX in6_ifstat_inc(rt->rt_ifp, ifs6_in_noroute) */
+ in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute);
if (mcopy) {
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_NOROUTE, 0);
} else if ((rt = ip6_forward_rt.ro_rt) == 0 ||
!IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst->sin6_addr)) {
if (ip6_forward_rt.ro_rt) {
- RTFREE(ip6_forward_rt.ro_rt);
+ rtfree(ip6_forward_rt.ro_rt);
ip6_forward_rt.ro_rt = 0;
}
bzero(dst, sizeof(*dst));
dst->sin6_family = AF_INET6;
dst->sin6_addr = ip6->ip6_dst;
-#if __FreeBSD__ || defined(__APPLE__)
rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
-#else
- rtalloc((struct route *)&ip6_forward_rt);
-#endif
if (ip6_forward_rt.ro_rt == 0) {
ip6stat.ip6s_noroute++;
- /* XXX in6_ifstat_inc(rt->rt_ifp, ifs6_in_noroute) */
+ in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute);
if (mcopy) {
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_NOROUTE, 0);
* for the reason that the destination is beyond the scope of the
* source address, discard the packet and return an icmp6 destination
* unreachable error with Code 2 (beyond scope of source address).
- * [draft-ietf-ipngwg-icmp-v3-00.txt, Section 3.1]
+ * [draft-ietf-ipngwg-icmp-v3-02.txt, Section 3.1]
*/
if (in6_addr2scopeid(m->m_pkthdr.rcvif, &ip6->ip6_src) !=
in6_addr2scopeid(rt->rt_ifp, &ip6->ip6_src)) {
in6_ifstat_inc(rt->rt_ifp, ifs6_in_toobig);
if (mcopy) {
u_long mtu;
-#if IPSEC_IPV6FWD
+#if IPSEC
struct secpolicy *sp;
int ipsecerror;
size_t ipsechdrsiz;
#endif
mtu = rt->rt_ifp->if_mtu;
-#if IPSEC_IPV6FWD
+#if IPSEC
/*
* When we do IPsec tunnel ingress, we need to play
* with if_mtu value (decrement IPsec header size
* modified by a redirect.
*/
if (rt->rt_ifp == m->m_pkthdr.rcvif && !srcrt &&
- (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0)
+ (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0) {
+ if ((rt->rt_ifp->if_flags & IFF_POINTOPOINT) != 0) {
+ /*
+ * If the incoming interface is equal to the outgoing
+ * one, and the link attached to the interface is
+ * point-to-point, then it will be highly probable
+ * that a routing loop occurs. Thus, we immediately
+ * drop the packet and send an ICMPv6 error message.
+ *
+ * type/code is based on suggestion by Rich Draves.
+ * not sure if it is the best pick.
+ */
+ icmp6_error(mcopy, ICMP6_DST_UNREACH,
+ ICMP6_DST_UNREACH_ADDR, 0);
+ m_freem(m);
+ return;
+ }
type = ND_REDIRECT;
+ }
-#if IPV6FIREWALL
/*
* Check with the firewall...
*/
- if (ip6_fw_chk_ptr) {
+ if (ip6_fw_enable && ip6_fw_chk_ptr) {
u_short port = 0;
/* If ipfw says divert, we have to just drop packet */
if ((*ip6_fw_chk_ptr)(&ip6, rt->rt_ifp, &port, &m)) {
if (!m)
goto freecopy;
}
-#endif
-#if OLDIP6OUTPUT
- error = (*rt->rt_ifp->if_output)(rt->rt_ifp, m,
- (struct sockaddr *)dst,
- ip6_forward_rt.ro_rt);
+ /*
+ * Fake scoped addresses. Note that even link-local source or
+ * destinaion can appear, if the originating node just sends the
+ * packet to us (without address resolution for the destination).
+ * Since both icmp6_error and icmp6_redirect_output fill the embedded
+ * link identifiers, we can do this stuff after making a copy for
+ * returning an error.
+ */
+ if ((rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
+ /*
+ * See corresponding comments in ip6_output.
+ * XXX: but is it possible that ip6_forward() sends a packet
+ * to a loopback interface? I don't think so, and thus
+ * I bark here. (jinmei@kame.net)
+ * XXX: it is common to route invalid packets to loopback.
+ * also, the codepath will be visited on use of ::1 in
+ * rthdr. (itojun)
+ */
+#if 1
+ if (0)
#else
- error = nd6_output(rt->rt_ifp, m, dst, rt);
-#endif
+ if ((rt->rt_flags & (RTF_BLACKHOLE|RTF_REJECT)) == 0)
+#endif
+ {
+ printf("ip6_forward: outgoing interface is loopback. "
+ "src %s, dst %s, nxt %d, rcvif %s, outif %s\n",
+ ip6_sprintf(&ip6->ip6_src),
+ ip6_sprintf(&ip6->ip6_dst),
+ ip6->ip6_nxt, if_name(m->m_pkthdr.rcvif),
+ if_name(rt->rt_ifp));
+ }
+
+ /* we can just use rcvif in forwarding. */
+ origifp = m->m_pkthdr.rcvif;
+ }
+ else
+ origifp = rt->rt_ifp;
+#ifndef SCOPEDROUTING
+ /*
+ * clear embedded scope identifiers if necessary.
+ * in6_clearscope will touch the addresses only when necessary.
+ */
+ in6_clearscope(&ip6->ip6_src);
+ in6_clearscope(&ip6->ip6_dst);
+#endif
+
+ error = nd6_output(rt->rt_ifp, origifp, m, dst, rt);
if (error) {
in6_ifstat_inc(rt->rt_ifp, ifs6_out_discard);
ip6stat.ip6s_cantforward++;
projects / apple / xnu.git / blobdiff