+/*
+ * Copyright (c) 2008 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 <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
struct rtentry *rt;
int error, type = 0, code = 0;
struct mbuf *mcopy = NULL;
- struct ifnet *origifp; /* maybe unnecessary */
+ struct ifnet *ifp, *origifp; /* maybe unnecessary */
#if IPSEC
struct secpolicy *sp = NULL;
#endif
skip_ipsec:
#endif /* IPSEC */
+ /*
+ * If "locked", ip6forward_rt points to the globally defined
+ * struct route cache which requires ip6_mutex, e.g. when this
+ * is called from ip6_input(). Else the caller is responsible
+ * for the struct route and its serialization (if needed), e.g.
+ * when this is called from ip6_rthdr0().
+ */
+ if (locked)
+ lck_mtx_assert(ip6_mutex, LCK_MTX_ASSERT_OWNED);
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);
+ RTF_PRCLONING);
+ 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) {
m_freem(m);
return;
}
- } 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_ign((struct route *)ip6forward_rt, RTF_PRCLONING);
+ 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);
icmp6_error(mcopy, ICMP6_DST_UNREACH,
- ICMP6_DST_UNREACH_NOROUTE, 0);
+ ICMP6_DST_UNREACH_NOROUTE, 0);
if (locked)
lck_mtx_lock(ip6_mutex);
}
m_freem(m);
return;
}
+ 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
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);
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 (mtu < IPV6_MMTU)
mtu = IPV6_MMTU;
#endif
+ /* Release extra ref */
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
if (locked)
lck_mtx_unlock(ip6_mutex);
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;
* 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);
if (locked)
lck_mtx_unlock(ip6_mutex);
icmp6_error(mcopy, ICMP6_DST_UNREACH,
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
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 PF
+ if (locked)
+ lck_mtx_unlock(ip6_mutex);
+
+ /* Invoke outbound packet filter */
+ error = pf_af_hook(ifp, NULL, &m, AF_INET6, FALSE);
+
+ if (locked)
+ lck_mtx_lock(ip6_mutex);
+
if (error) {
- in6_ifstat_inc(rt->rt_ifp, ifs6_out_discard);
+ 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, locked);
+ if (error) {
+ 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
icmp6_error(mcopy, type, code, 0);
if (locked)
lck_mtx_lock(ip6_mutex);
+ /* Release extra ref */
+ RT_REMREF(rt);
return;
freecopy:
m_freem(mcopy);
+ /* Release extra ref */
+ RT_REMREF(rt);
return;
}
projects / apple / xnu.git / blobdiff