+/*
+ * Copyright (c) 2009-2011 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 <netkey/key.h>
extern int ipsec_bypass;
#endif /* IPSEC */
-extern lck_mtx_t *ip6_mutex;
#include <netinet6/ip6_fw.h>
#include <net/net_osdep.h>
+#if PF
+#include <net/pfvar.h>
+#endif /* PF */
+
/*
* Forward a packet. If some error occurs return the sender
* an icmp packet. Note we can't always generate a meaningful
*
*/
-void
+struct mbuf *
ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt,
- int srcrt, int locked)
+ int srcrt)
{
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct sockaddr_in6 *dst;
struct rtentry *rt;
int error, type = 0, code = 0;
+ boolean_t proxy = FALSE;
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;
- int tunneledv4 = 0;
+ 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->pftag_rtableid != IFSCOPE_NONE)
+ ifscope = pf_mtag->pftag_rtableid;
+ /*
+ * If the caller provides a route which is on a different interface
+ * than the one specified for scoped forwarding, discard the route
+ * and do a lookup below.
+ */
+ if (ifscope != IFSCOPE_NONE && (rt = ip6forward_rt->ro_rt) != NULL) {
+ RT_LOCK(rt);
+ if (rt->rt_ifp->if_index != ifscope) {
+ RT_UNLOCK(rt);
+ rtfree(rt);
+ rt = ip6forward_rt->ro_rt = NULL;
+ } else {
+ RT_UNLOCK(rt);
+ }
+ }
+#endif /* PF */
#if IPSEC
/*
if (ipsec6_in_reject(m, NULL)) {
IPSEC_STAT_INCREMENT(ipsec6stat.in_polvio);
m_freem(m);
- return;
+ return (NULL);
}
}
#endif /*IPSEC*/
if_name(m->m_pkthdr.rcvif));
}
m_freem(m);
- return;
+ return (NULL);
}
if (ip6->ip6_hlim <= IPV6_HLIMDEC) {
/* XXX in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard) */
- if (locked)
- lck_mtx_unlock(ip6_mutex);
icmp6_error(m, ICMP6_TIME_EXCEEDED,
ICMP6_TIME_EXCEED_TRANSIT, 0);
- if (locked)
- lck_mtx_lock(ip6_mutex);
- return;
+ return (NULL);
+ }
+
+ /*
+ * See if the destination is a proxied address, and if so pretend
+ * that it's for us. This is mostly to handle NUD probes against
+ * the proxied addresses. We filter for ICMPv6 here and will let
+ * icmp6_input handle the rest.
+ */
+ if (!srcrt && nd6_prproxy) {
+ VERIFY(!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst));
+ proxy = nd6_prproxy_isours(m, ip6, ip6forward_rt, ifscope);
+ /*
+ * Don't update hop limit while proxying; RFC 4389 4.1.
+ * Also skip IPsec forwarding path processing as this
+ * packet is not to be forwarded.
+ */
+ if (proxy)
+ goto skip_ipsec;
}
+
ip6->ip6_hlim -= IPV6_HLIMDEC;
/*
#endif
}
m_freem(m);
- return;
+ return (NULL);
}
error = 0;
#endif
}
m_freem(m);
- return;
+ return (NULL);
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
#endif
}
m_freem(m);
- return;
+ return (NULL);
}
/* do IPsec */
break;
*/
bzero(&state, sizeof(state));
state.m = m;
- state.ro = NULL; /* update at ipsec6_output_tunnel() */
state.dst = NULL; /* update at ipsec6_output_tunnel() */
- if (locked)
- lck_mtx_unlock(ip6_mutex);
- error = ipsec6_output_tunnel(&state, sp, 0, &tunneledv4);
- if (locked)
- lck_mtx_lock(ip6_mutex);
+ error = ipsec6_output_tunnel(&state, sp, 0);
key_freesp(sp, KEY_SADB_UNLOCKED);
- if (tunneledv4)
- return; /* packet is gone - sent over IPv4 */
+ if (state.tunneled == 4)
+ return (NULL); /* packet is gone - sent over IPv4 */
m = state.m;
+ 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) {
#endif
}
m_freem(m);
- return;
+ return (NULL);
}
}
skip_ipsec:
#endif /* IPSEC */
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) {
/*
* ip6forward_rt->ro_dst.sin6_addr is equal to ip6->ip6_dst
*/
- if (ip6forward_rt->ro_rt == 0 ||
- (ip6forward_rt->ro_rt->rt_flags & RTF_UP) == 0) {
- if (ip6forward_rt->ro_rt) {
- rtfree(ip6forward_rt->ro_rt);
- ip6forward_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 *)ip6forward_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 (ip6forward_rt->ro_rt == 0) {
+ if (rt == NULL) {
ip6stat.ip6s_noroute++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute);
- if (mcopy) {
- if (locked)
- lck_mtx_unlock(ip6_mutex);
+ if (mcopy)
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_NOROUTE, 0);
- if (locked)
- lck_mtx_lock(ip6_mutex);
- }
m_freem(m);
- return;
+ return (NULL);
}
- } else if ((rt = ip6forward_rt->ro_rt) == 0 ||
- !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst->sin6_addr)) {
- if (ip6forward_rt->ro_rt) {
- rtfree(ip6forward_rt->ro_rt);
- ip6forward_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 *)ip6forward_rt, RTF_PRCLONING);
- if (ip6forward_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 (locked)
- lck_mtx_unlock(ip6_mutex);
+ if (mcopy)
icmp6_error(mcopy, ICMP6_DST_UNREACH,
- ICMP6_DST_UNREACH_NOROUTE, 0);
- if (locked)
- lck_mtx_lock(ip6_mutex);
- }
+ ICMP6_DST_UNREACH_NOROUTE, 0);
m_freem(m);
- return;
+ return (NULL);
}
+ RT_LOCK(rt);
+ /* Take an extra ref for ourselves */
+ RT_ADDREF_LOCKED(rt);
}
- rt = ip6forward_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-v3-02.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) unless we are proxying (source address is link local
+ * for NUDs.) 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 (NULL);
+ }
+ if (in6_setscope(&src_in6, m->m_pkthdr.rcvif, &inzone)) {
+ ip6stat.ip6s_cantforward++;
+ ip6stat.ip6s_badscope++;
+ m_freem(m);
+ return (NULL);
+ }
+
+ if (inzone != outzone && !proxy) {
ip6stat.ip6s_cantforward++;
ip6stat.ip6s_badscope++;
in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard);
ip6->ip6_nxt,
if_name(m->m_pkthdr.rcvif), if_name(rt->rt_ifp));
}
+ /* Release extra ref */
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
if (mcopy) {
- if (locked)
- lck_mtx_unlock(ip6_mutex);
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_BEYONDSCOPE, 0);
- if (locked)
- lck_mtx_lock(ip6_mutex);
}
m_freem(m);
- return;
+ return (NULL);
+ }
+
+ /*
+ * 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 (NULL);
}
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 *sp2;
int ipsecerror;
#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".
if (mtu < IPV6_MMTU)
mtu = IPV6_MMTU;
#endif
- if (locked)
- lck_mtx_unlock(ip6_mutex);
+ /* Release extra ref */
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
icmp6_error(mcopy, ICMP6_PACKET_TOO_BIG, 0, mtu);
- if (locked)
- lck_mtx_lock(ip6_mutex);
+ } else {
+ /* Release extra ref */
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
}
m_freem(m);
- return;
+ return (NULL);
}
if (rt->rt_flags & RTF_GATEWAY)
- dst = (struct sockaddr_in6 *)rt->rt_gateway;
+ dst = (struct sockaddr_in6 *)(void *)rt->rt_gateway;
/*
* If we are to forward the packet using the same interface
* Also, don't send redirect if forwarding using a route
* modified by a redirect.
*/
- if (rt->rt_ifp == m->m_pkthdr.rcvif && !srcrt &&
+ if (!proxy &&
+ 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.
*/
- if (locked)
- lck_mtx_unlock(ip6_mutex);
+ RT_REMREF_LOCKED(rt); /* Release extra ref */
+ RT_UNLOCK(rt);
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_ADDR, 0);
- if (locked)
- lck_mtx_lock(ip6_mutex);
m_freem(m);
- return;
+ return (NULL);
}
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
}
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, locked);
+ ifp = rt->rt_ifp;
+ /* Drop the lock but retain the extra ref */
+ RT_UNLOCK(rt);
+
+ /*
+ * If this is to be processed locally, let ip6_input have it.
+ */
+ if (proxy) {
+ VERIFY(m->m_pkthdr.aux_flags & MAUXF_PROXY_DST);
+ /* Release extra ref */
+ RT_REMREF(rt);
+ if (mcopy != NULL)
+ m_freem(mcopy);
+ return (m);
+ }
+
+#if PF
+ /* Invoke outbound packet filter */
+ error = pf_af_hook(ifp, NULL, &m, AF_INET6, FALSE, NULL);
+
+ if (error != 0 || m == NULL) {
+ 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, NULL);
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)
- return;
-
+#if PF
+senderr:
+#endif /* PF */
+ if (mcopy == NULL) {
+ /* Release extra ref */
+ RT_REMREF(rt);
+ return (NULL);
+ }
switch (error) {
case 0:
#if 1
if (type == ND_REDIRECT) {
icmp6_redirect_output(mcopy, rt);
- return;
+ /* Release extra ref */
+ RT_REMREF(rt);
+ return (NULL);
}
#endif
goto freecopy;
code = ICMP6_DST_UNREACH_ADDR;
break;
}
- if (locked)
- lck_mtx_unlock(ip6_mutex);
icmp6_error(mcopy, type, code, 0);
- if (locked)
- lck_mtx_lock(ip6_mutex);
- return;
+ /* Release extra ref */
+ RT_REMREF(rt);
+ return (NULL);
freecopy:
m_freem(mcopy);
- return;
+ /* Release extra ref */
+ RT_REMREF(rt);
+ return (NULL);
}
projects / apple / xnu.git / blobdiff