/*
- * Copyright (c) 2009-2010 Apple Inc. All rights reserved.
+ * Copyright (c) 2009-2011 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
*
*/
-void
+struct mbuf *
ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt,
int srcrt)
{
struct sockaddr_in6 *dst;
struct rtentry *rt;
int error, type = 0, code = 0;
+ boolean_t proxy = FALSE;
struct mbuf *mcopy = NULL;
struct ifnet *ifp, *origifp; /* maybe unnecessary */
u_int32_t inzone, outzone;
getmicrotime(&timenow);
#if PF
pf_mtag = pf_find_mtag(m);
- if (pf_mtag != NULL && pf_mtag->rtableid != IFSCOPE_NONE)
- ifscope = pf_mtag->rtableid;
+ 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) */
icmp6_error(m, ICMP6_TIME_EXCEEDED,
ICMP6_TIME_EXCEED_TRANSIT, 0);
- 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;
error = ipsec6_output_tunnel(&state, sp, 0);
key_freesp(sp, KEY_SADB_UNLOCKED);
if (state.tunneled == 4)
- return; /* packet is gone - sent over IPv4 */
+ return (NULL); /* packet is gone - sent over IPv4 */
m = state.m;
if (state.ro.ro_rt) {
#endif
}
m_freem(m);
- return;
+ return (NULL);
}
}
skip_ipsec:
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_NOROUTE, 0);
m_freem(m);
- return;
+ return (NULL);
}
RT_LOCK_ASSERT_HELD(rt);
} else if (rt == NULL || !(rt->rt_flags & RTF_UP) ||
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_NOROUTE, 0);
m_freem(m);
- return;
+ return (NULL);
}
RT_LOCK(rt);
/* Take an extra ref for ourselves */
* 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()
+ * 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]
*/
ip6stat.ip6s_cantforward++;
ip6stat.ip6s_badscope++;
m_freem(m);
- return;
+ return (NULL);
}
if (in6_setscope(&src_in6, m->m_pkthdr.rcvif, &inzone)) {
ip6stat.ip6s_cantforward++;
ip6stat.ip6s_badscope++;
m_freem(m);
- return;
+ return (NULL);
}
- if (inzone != outzone) {
+
+ if (inzone != outzone && !proxy) {
ip6stat.ip6s_cantforward++;
ip6stat.ip6s_badscope++;
in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard);
ICMP6_DST_UNREACH_BEYONDSCOPE, 0);
}
m_freem(m);
- return;
+ return (NULL);
}
/*
ip6stat.ip6s_cantforward++;
ip6stat.ip6s_badscope++;
m_freem(m);
- return;
+ return (NULL);
}
if (m->m_pkthdr.len > rt->rt_ifp->if_mtu) {
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 (ip6_sendredirects && 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) {
/*
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_ADDR, 0);
m_freem(m);
- return;
+ return (NULL);
}
type = ND_REDIRECT;
}
/* 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);
+ error = pf_af_hook(ifp, NULL, &m, AF_INET6, FALSE, NULL);
- if (error) {
+ if (error != 0 || m == NULL) {
if (m != NULL) {
panic("%s: unexpected packet %p\n", __func__, m);
/* NOTREACHED */
ip6 = mtod(m, struct ip6_hdr *);
#endif /* PF */
- error = nd6_output(ifp, origifp, m, dst, rt);
+ error = nd6_output(ifp, origifp, m, dst, rt, NULL);
if (error) {
in6_ifstat_inc(ifp, ifs6_out_discard);
ip6stat.ip6s_cantforward++;
if (mcopy == NULL) {
/* Release extra ref */
RT_REMREF(rt);
- return;
+ return (NULL);
}
switch (error) {
case 0:
icmp6_redirect_output(mcopy, rt);
/* Release extra ref */
RT_REMREF(rt);
- return;
+ return (NULL);
}
#endif
goto freecopy;
icmp6_error(mcopy, type, code, 0);
/* Release extra ref */
RT_REMREF(rt);
- return;
+ return (NULL);
freecopy:
m_freem(mcopy);
/* Release extra ref */
RT_REMREF(rt);
- return;
+ return (NULL);
}
projects / apple / xnu.git / blobdiff