-/* $FreeBSD: src/sys/netinet6/ip6_forward.c,v 1.4.2.4 2001/07/03 11:01:53 ume Exp $ */
+/*
+ * Copyright (c) 2009-2010 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+/* $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 $ */
/*
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#include <netinet6/nd6.h>
+#include <netinet6/scope6_var.h>
#include <netinet/in_pcb.h>
#include <net/net_osdep.h>
-struct route_in6 ip6_forward_rt;
+#if PF
+#include <net/pfvar.h>
+#endif /* PF */
/*
* Forward a packet. If some error occurs return the sender
*/
void
-ip6_forward(m, srcrt)
- struct mbuf *m;
- int srcrt;
+ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt,
+ int srcrt)
{
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct sockaddr_in6 *dst;
struct rtentry *rt;
int error, type = 0, code = 0;
struct mbuf *mcopy = NULL;
- struct ifnet *origifp; /* maybe unnecessary */
+ struct ifnet *ifp, *origifp; /* maybe unnecessary */
+ u_int32_t inzone, outzone;
+ struct in6_addr src_in6, dst_in6;
#if IPSEC
struct secpolicy *sp = NULL;
#endif
+ struct timeval timenow;
+ unsigned int ifscope = IFSCOPE_NONE;
+#if PF
+ struct pf_mtag *pf_mtag;
+#endif /* PF */
+
+ getmicrotime(&timenow);
+#if PF
+ pf_mtag = pf_find_mtag(m);
+ if (pf_mtag != NULL && pf_mtag->rtableid != IFSCOPE_NONE)
+ ifscope = pf_mtag->rtableid;
+#endif /* PF */
#if IPSEC
/*
* Don't increment ip6s_cantforward because this is the check
* before forwarding packet actually.
*/
- if (ipsec_bypass == 0 && ipsec6_in_reject(m, NULL)) {
- ipsec6stat.in_polvio++;
- m_freem(m);
- return;
+ if (ipsec_bypass == 0) {
+ if (ipsec6_in_reject(m, NULL)) {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_polvio);
+ m_freem(m);
+ return;
+ }
}
#endif /*IPSEC*/
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) {
- ip6_log_time = time_second;
+ if (ip6_log_time + ip6_log_interval < timenow.tv_sec) {
+ ip6_log_time = timenow.tv_sec;
log(LOG_DEBUG,
"cannot forward "
"from %s to %s nxt %d received on %s\n",
#if IPSEC
if (ipsec_bypass != 0)
goto skip_ipsec;
-
/* get a security policy for this packet */
sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, IP_FORWARDING,
&error);
if (sp == NULL) {
- ipsec6stat.out_inval++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
ip6stat.ip6s_cantforward++;
if (mcopy) {
#if 0
/* check policy */
switch (sp->policy) {
case IPSEC_POLICY_DISCARD:
+ case IPSEC_POLICY_GENERATE:
/*
* This packet is just discarded.
*/
- ipsec6stat.out_polvio++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.out_polvio);
ip6stat.ip6s_cantforward++;
- key_freesp(sp);
+ key_freesp(sp, KEY_SADB_UNLOCKED);
if (mcopy) {
#if 0
/* XXX: what icmp ? */
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
/* no need to do IPsec. */
- key_freesp(sp);
+ key_freesp(sp, KEY_SADB_UNLOCKED);
goto skip_ipsec;
case IPSEC_POLICY_IPSEC:
/* XXX should be panic ? */
printf("ip6_forward: No IPsec request specified.\n");
ip6stat.ip6s_cantforward++;
- key_freesp(sp);
+ key_freesp(sp, KEY_SADB_UNLOCKED);
if (mcopy) {
#if 0
/* XXX: what icmp ? */
default:
/* should be panic ?? */
printf("ip6_forward: Invalid policy found. %d\n", sp->policy);
- key_freesp(sp);
+ key_freesp(sp, KEY_SADB_UNLOCKED);
goto skip_ipsec;
}
*/
bzero(&state, sizeof(state));
state.m = m;
- state.ro = NULL; /* update at ipsec6_output_tunnel() */
state.dst = NULL; /* update at ipsec6_output_tunnel() */
error = ipsec6_output_tunnel(&state, sp, 0);
-
+ key_freesp(sp, KEY_SADB_UNLOCKED);
+ if (state.tunneled == 4)
+ return; /* packet is gone - sent over IPv4 */
+
m = state.m;
- key_freesp(sp);
-
+ if (state.ro.ro_rt) {
+ rtfree(state.ro.ro_rt);
+ state.ro.ro_rt = NULL;
+ }
if (error) {
/* mbuf is already reclaimed in ipsec6_output_tunnel. */
switch (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 */
- dst = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
+ dst = (struct sockaddr_in6 *)&ip6forward_rt->ro_dst;
+ if ((rt = ip6forward_rt->ro_rt) != NULL) {
+ RT_LOCK(rt);
+ /* Take an extra ref for ourselves */
+ RT_ADDREF_LOCKED(rt);
+ }
+
if (!srcrt) {
/*
- * ip6_forward_rt.ro_dst.sin6_addr is equal to ip6->ip6_dst
+ * ip6forward_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);
- ip6_forward_rt.ro_rt = 0;
+ if (rt == NULL || !(rt->rt_flags & RTF_UP) ||
+ rt->generation_id != route_generation) {
+ if (rt != NULL) {
+ /* Release extra ref */
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
+ rtfree(rt);
+ ip6forward_rt->ro_rt = NULL;
}
/* this probably fails but give it a try again */
- rtalloc_ign((struct route *)&ip6_forward_rt,
- RTF_PRCLONING);
+ rtalloc_scoped_ign((struct route *)ip6forward_rt,
+ RTF_PRCLONING, ifscope);
+ if ((rt = ip6forward_rt->ro_rt) != NULL) {
+ RT_LOCK(rt);
+ /* Take an extra ref for ourselves */
+ RT_ADDREF_LOCKED(rt);
+ }
}
- if (ip6_forward_rt.ro_rt == 0) {
+ if (rt == NULL) {
ip6stat.ip6s_noroute++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute);
- if (mcopy) {
+ if (mcopy)
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_NOROUTE, 0);
- }
m_freem(m);
return;
}
- } 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);
- ip6_forward_rt.ro_rt = 0;
+ RT_LOCK_ASSERT_HELD(rt);
+ } else if (rt == NULL || !(rt->rt_flags & RTF_UP) ||
+ !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst->sin6_addr) ||
+ rt->generation_id != route_generation) {
+ if (rt != NULL) {
+ /* Release extra ref */
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
+ rtfree(rt);
+ ip6forward_rt->ro_rt = NULL;
}
bzero(dst, sizeof(*dst));
dst->sin6_len = sizeof(struct sockaddr_in6);
dst->sin6_family = AF_INET6;
dst->sin6_addr = ip6->ip6_dst;
- rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
- if (ip6_forward_rt.ro_rt == 0) {
+ rtalloc_scoped_ign((struct route *)ip6forward_rt,
+ RTF_PRCLONING, ifscope);
+ if ((rt = ip6forward_rt->ro_rt) == NULL) {
ip6stat.ip6s_noroute++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute);
- if (mcopy) {
+ if (mcopy)
icmp6_error(mcopy, ICMP6_DST_UNREACH,
- ICMP6_DST_UNREACH_NOROUTE, 0);
- }
+ ICMP6_DST_UNREACH_NOROUTE, 0);
m_freem(m);
return;
}
+ RT_LOCK(rt);
+ /* Take an extra ref for ourselves */
+ RT_ADDREF_LOCKED(rt);
}
- rt = ip6_forward_rt.ro_rt;
/*
- * Scope check: if a packet can't be delivered to its destination
- * 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]
+ * Source scope check: if a packet can't be delivered to its
+ * destination 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). We use a local copy of ip6_src, since in6_setscope()
+ * will possibly modify its first argument.
+ * [draft-ietf-ipngwg-icmp-v3-04.txt, Section 3.1]
*/
- if (in6_addr2scopeid(m->m_pkthdr.rcvif, &ip6->ip6_src) !=
- in6_addr2scopeid(rt->rt_ifp, &ip6->ip6_src)) {
+ src_in6 = ip6->ip6_src;
+ if (in6_setscope(&src_in6, rt->rt_ifp, &outzone)) {
+ /* XXX: this should not happen */
+ ip6stat.ip6s_cantforward++;
+ ip6stat.ip6s_badscope++;
+ m_freem(m);
+ return;
+ }
+ if (in6_setscope(&src_in6, m->m_pkthdr.rcvif, &inzone)) {
+ ip6stat.ip6s_cantforward++;
+ ip6stat.ip6s_badscope++;
+ m_freem(m);
+ return;
+ }
+ if (inzone != outzone) {
ip6stat.ip6s_cantforward++;
ip6stat.ip6s_badscope++;
in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard);
- if (ip6_log_time + ip6_log_interval < time_second) {
- ip6_log_time = time_second;
+ if (ip6_log_time + ip6_log_interval < timenow.tv_sec) {
+ ip6_log_time = timenow.tv_sec;
log(LOG_DEBUG,
"cannot forward "
"src %s, dst %s, nxt %d, rcvif %s, outif %s\n",
ip6->ip6_nxt,
if_name(m->m_pkthdr.rcvif), if_name(rt->rt_ifp));
}
- if (mcopy)
+ /* Release extra ref */
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
+ if (mcopy) {
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_BEYONDSCOPE, 0);
+ }
+ m_freem(m);
+ return;
+ }
+
+ /*
+ * Destination scope check: if a packet is going to break the scope
+ * zone of packet's destination address, discard it. This case should
+ * usually be prevented by appropriately-configured routing table, but
+ * we need an explicit check because we may mistakenly forward the
+ * packet to a different zone by (e.g.) a default route.
+ */
+ dst_in6 = ip6->ip6_dst;
+ if (in6_setscope(&dst_in6, m->m_pkthdr.rcvif, &inzone) != 0 ||
+ in6_setscope(&dst_in6, rt->rt_ifp, &outzone) != 0 ||
+ inzone != outzone) {
+ ip6stat.ip6s_cantforward++;
+ ip6stat.ip6s_badscope++;
m_freem(m);
return;
}
if (m->m_pkthdr.len > rt->rt_ifp->if_mtu) {
in6_ifstat_inc(rt->rt_ifp, ifs6_in_toobig);
if (mcopy) {
- u_long mtu;
+ uint32_t mtu;
#if IPSEC
- struct secpolicy *sp;
+ struct secpolicy *sp2;
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
+ * with the link value (decrement IPsec header size
* from mtu value). The code is much simpler than v4
* case, as we have the outgoing interface for
* encapsulated packet as "rt->rt_ifp".
*/
- sp = ipsec6_getpolicybyaddr(mcopy, IPSEC_DIR_OUTBOUND,
+ sp2 = ipsec6_getpolicybyaddr(mcopy, IPSEC_DIR_OUTBOUND,
IP_FORWARDING, &ipsecerror);
- if (sp) {
+ if (sp2) {
ipsechdrsiz = ipsec6_hdrsiz(mcopy,
IPSEC_DIR_OUTBOUND, NULL);
if (ipsechdrsiz < mtu)
mtu -= ipsechdrsiz;
+ key_freesp(sp2, KEY_SADB_UNLOCKED);
}
-
/*
* if mtu becomes less than minimum MTU,
* tell minimum MTU (and I'll need to fragment it).
if (mtu < IPV6_MMTU)
mtu = IPV6_MMTU;
#endif
+ /* Release extra ref */
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
icmp6_error(mcopy, ICMP6_PACKET_TOO_BIG, 0, mtu);
+ } else {
+ /* Release extra ref */
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
}
m_freem(m);
return;
* Also, don't send redirect if forwarding using a route
* modified by a redirect.
*/
- if (rt->rt_ifp == m->m_pkthdr.rcvif && !srcrt &&
+ if (ip6_sendredirects && rt->rt_ifp == m->m_pkthdr.rcvif && !srcrt &&
(rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0) {
if ((rt->rt_ifp->if_flags & IFF_POINTOPOINT) != 0) {
/*
* type/code is based on suggestion by Rich Draves.
* not sure if it is the best pick.
*/
+ RT_REMREF_LOCKED(rt); /* Release extra ref */
+ RT_UNLOCK(rt);
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_ADDR, 0);
m_freem(m);
type = ND_REDIRECT;
}
+#if IPFW2
/*
* Check with the firewall...
*/
if (ip6_fw_enable && ip6_fw_chk_ptr) {
u_short port = 0;
+ ifp = rt->rt_ifp;
+ /* Drop the lock but retain the extra ref */
+ RT_UNLOCK(rt);
/* If ipfw says divert, we have to just drop packet */
- if ((*ip6_fw_chk_ptr)(&ip6, rt->rt_ifp, &port, &m)) {
+ if (ip6_fw_chk_ptr(&ip6, ifp, &port, &m)) {
m_freem(m);
goto freecopy;
}
- if (!m)
+ if (!m) {
goto freecopy;
+ }
+ /* We still have the extra ref on rt */
+ RT_LOCK(rt);
}
+#endif
/*
* Fake scoped addresses. Note that even link-local source or
#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));
+ "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. */
}
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);
+ ifp = rt->rt_ifp;
+ /* Drop the lock but retain the extra ref */
+ RT_UNLOCK(rt);
+
+#if PF
+ /* Invoke outbound packet filter */
+ error = pf_af_hook(ifp, NULL, &m, AF_INET6, FALSE);
+
+ if (error) {
+ if (m != NULL) {
+ panic("%s: unexpected packet %p\n", __func__, m);
+ /* NOTREACHED */
+ }
+ /* Already freed by callee */
+ goto senderr;
+ }
+ ip6 = mtod(m, struct ip6_hdr *);
+#endif /* PF */
+
+ error = nd6_output(ifp, origifp, m, dst, rt);
if (error) {
- in6_ifstat_inc(rt->rt_ifp, ifs6_out_discard);
+ in6_ifstat_inc(ifp, ifs6_out_discard);
ip6stat.ip6s_cantforward++;
} else {
ip6stat.ip6s_forward++;
- in6_ifstat_inc(rt->rt_ifp, ifs6_out_forward);
+ in6_ifstat_inc(ifp, ifs6_out_forward);
if (type)
ip6stat.ip6s_redirectsent++;
else {
- if (mcopy)
+ if (mcopy) {
goto freecopy;
+ }
}
}
- if (mcopy == NULL)
+#if PF
+senderr:
+#endif /* PF */
+ if (mcopy == NULL) {
+ /* Release extra ref */
+ RT_REMREF(rt);
return;
-
+ }
switch (error) {
case 0:
#if 1
if (type == ND_REDIRECT) {
icmp6_redirect_output(mcopy, rt);
+ /* Release extra ref */
+ RT_REMREF(rt);
return;
}
#endif
break;
}
icmp6_error(mcopy, type, code, 0);
+ /* Release extra ref */
+ RT_REMREF(rt);
return;
freecopy:
m_freem(mcopy);
+ /* Release extra ref */
+ RT_REMREF(rt);
return;
}
projects / apple / xnu.git / blobdiff