-/* $FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.3 2001/07/03 11:01:52 ume Exp $ */
-/* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $ */
+/*
+ * Copyright (c) 2009-2016 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/in6_gif.c,v 1.2.2.3 2001/07/03 11:01:52 ume Exp $ */
+/* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
#include <net/net_osdep.h>
int
-in6_gif_output(ifp, family, m, rt)
- struct ifnet *ifp;
- int family; /* family of the packet to be encapsulate. */
- struct mbuf *m;
- struct rtentry *rt;
+in6_gif_output(
+ struct ifnet *ifp,
+ int family, /* family of the packet to be encapsulate. */
+ struct mbuf *m,
+ __unused struct rtentry *rt)
{
- struct gif_softc *sc = (struct gif_softc*)ifp;
+ struct gif_softc *sc = ifnet_softc(ifp);
struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
- struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
- struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
+ struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)
+ (void *)sc->gif_psrc;
+ struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)
+ (void *)sc->gif_pdst;
struct ip6_hdr *ip6;
int proto;
u_int8_t itos, otos;
+ GIF_LOCK_ASSERT(sc);
+
if (sin6_src == NULL || sin6_dst == NULL ||
sin6_src->sin6_family != AF_INET6 ||
sin6_dst->sin6_family != AF_INET6) {
m_freem(m);
- return EAFNOSUPPORT;
+ return (EAFNOSUPPORT);
}
switch (family) {
struct ip *ip;
proto = IPPROTO_IPV4;
- if (m->m_len < sizeof(*ip)) {
- m = m_pullup(m, sizeof(*ip));
+ if (mbuf_len(m) < sizeof (*ip)) {
+ m = m_pullup(m, sizeof (*ip));
if (!m)
- return ENOBUFS;
+ return (ENOBUFS);
}
ip = mtod(m, struct ip *);
itos = ip->ip_tos;
#if INET6
case AF_INET6:
{
- struct ip6_hdr *ip6;
proto = IPPROTO_IPV6;
- if (m->m_len < sizeof(*ip6)) {
- m = m_pullup(m, sizeof(*ip6));
+ if (mbuf_len(m) < sizeof (*ip6)) {
+ m = m_pullup(m, sizeof (*ip6));
if (!m)
- return ENOBUFS;
+ return (ENOBUFS);
}
ip6 = mtod(m, struct ip6_hdr *);
itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
family);
#endif
m_freem(m);
- return EAFNOSUPPORT;
+ return (EAFNOSUPPORT);
}
-
+
/* prepend new IP header */
- M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
- if (m && m->m_len < sizeof(struct ip6_hdr))
- m = m_pullup(m, sizeof(struct ip6_hdr));
+ M_PREPEND(m, sizeof (struct ip6_hdr), M_DONTWAIT, 1);
+ if (m && mbuf_len(m) < sizeof (struct ip6_hdr))
+ m = m_pullup(m, sizeof (struct ip6_hdr));
if (m == NULL) {
printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
- return ENOBUFS;
+ return (ENOBUFS);
}
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_dst = sin6_dst->sin6_addr;
else {
m_freem(m);
- return ENETUNREACH;
+ return (ENETUNREACH);
}
- if (ifp->if_flags & IFF_LINK1)
- ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
- else
- ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
- ip6->ip6_flow &= ~ntohl(0xff00000);
+ ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_NORMAL : ECN_NOCARE,
+ &otos, &itos);
+ ip6->ip6_flow &= ~htonl(0xff << 20);
ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
- if (dst->sin6_family != sin6_dst->sin6_family ||
- !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
- /* cache route doesn't match */
- bzero(dst, sizeof(*dst));
+ if (ROUTE_UNUSABLE(&sc->gif_ro6) ||
+ dst->sin6_family != sin6_dst->sin6_family ||
+ !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr) ||
+ (sc->gif_ro6.ro_rt != NULL && sc->gif_ro6.ro_rt->rt_ifp == ifp)) {
+ /* cache route doesn't match or recursive route */
+ bzero(dst, sizeof (*dst));
dst->sin6_family = sin6_dst->sin6_family;
- dst->sin6_len = sizeof(struct sockaddr_in6);
+ dst->sin6_len = sizeof (struct sockaddr_in6);
dst->sin6_addr = sin6_dst->sin6_addr;
- if (sc->gif_ro6.ro_rt) {
- rtfree(sc->gif_ro6.ro_rt);
- sc->gif_ro6.ro_rt = NULL;
- }
+ ROUTE_RELEASE(&sc->gif_ro6);
#if 0
sc->gif_if.if_mtu = GIF_MTU;
#endif
rtalloc((struct route *)&sc->gif_ro6);
if (sc->gif_ro6.ro_rt == NULL) {
m_freem(m);
- return ENETUNREACH;
+ return (ENETUNREACH);
}
-
+ RT_LOCK(sc->gif_ro6.ro_rt);
/* if it constitutes infinite encapsulation, punt. */
- if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
+ if (sc->gif_ro6.ro_rt->rt_ifp == ifp) {
+ RT_UNLOCK(sc->gif_ro6.ro_rt);
m_freem(m);
- return ENETUNREACH; /*XXX*/
+ return (ENETUNREACH); /* XXX */
}
#if 0
ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
- - sizeof(struct ip6_hdr);
+ - sizeof (struct ip6_hdr);
#endif
+ RT_UNLOCK(sc->gif_ro6.ro_rt);
}
-
+
#if IPV6_MINMTU
/*
* force fragmentation to minimum MTU, to avoid path MTU discovery.
* it is too painful to ask for resend of inner packet, to achieve
* path MTU discovery for encapsulated packets.
*/
- return(ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL));
+ return (ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL));
#else
- return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL));
+ return (ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL));
#endif
}
-int in6_gif_input(mp, offp)
- struct mbuf **mp;
- int *offp;
+int
+in6_gif_input(struct mbuf **mp, int *offp, int proto)
{
struct mbuf *m = *mp;
struct ifnet *gifp = NULL;
struct ip6_hdr *ip6;
int af = 0;
u_int32_t otos;
- u_int8_t proto;
+ int egress_success = 0;
ip6 = mtod(m, struct ip6_hdr *);
- gifp = (struct ifnet *)encap_getarg(m);
+ gifp = ((struct gif_softc *)encap_getarg(m))->gif_if;
if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
m_freem(m);
ip6stat.ip6s_nogif++;
- return IPPROTO_DONE;
+ return (IPPROTO_DONE);
}
- proto = ip6->ip6_nxt;
otos = ip6->ip6_flow;
m_adj(m, *offp);
case IPPROTO_IPV4:
{
struct ip *ip;
- u_int8_t otos8;
+ u_int8_t otos8, old_tos;
+ int sum;
+
af = AF_INET;
otos8 = (ntohl(otos) >> 20) & 0xff;
- if (m->m_len < sizeof(*ip)) {
- m = m_pullup(m, sizeof(*ip));
+ if (mbuf_len(m) < sizeof (*ip)) {
+ m = m_pullup(m, sizeof (*ip));
if (!m)
- return IPPROTO_DONE;
+ return (IPPROTO_DONE);
}
ip = mtod(m, struct ip *);
- if (gifp->if_flags & IFF_LINK1)
- ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
- else
- ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
+ if (gifp->if_flags & IFF_LINK1) {
+ old_tos = ip->ip_tos;
+ egress_success = ip_ecn_egress(ECN_NORMAL, &otos8, &ip->ip_tos);
+ if (old_tos != ip->ip_tos) {
+ sum = ~ntohs(ip->ip_sum) & 0xffff;
+ sum += (~old_tos & 0xffff) + ip->ip_tos;
+ sum = (sum >> 16) + (sum & 0xffff);
+ sum += (sum >> 16); /* add carry */
+ ip->ip_sum = htons(~sum & 0xffff);
+ }
+ } else
+ egress_success = ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
break;
}
#endif /* INET */
#if INET6
case IPPROTO_IPV6:
{
- struct ip6_hdr *ip6;
af = AF_INET6;
- if (m->m_len < sizeof(*ip6)) {
- m = m_pullup(m, sizeof(*ip6));
+ if (mbuf_len(m) < sizeof (*ip6)) {
+ m = m_pullup(m, sizeof (*ip6));
if (!m)
- return IPPROTO_DONE;
+ return (IPPROTO_DONE);
}
ip6 = mtod(m, struct ip6_hdr *);
if (gifp->if_flags & IFF_LINK1)
- ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
+ egress_success = ip6_ecn_egress(ECN_NORMAL, &otos, &ip6->ip6_flow);
else
- ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
+ egress_success = ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
break;
}
#endif
default:
ip6stat.ip6s_nogif++;
m_freem(m);
- return IPPROTO_DONE;
+ return (IPPROTO_DONE);
}
-
- dlil_input(gifp, m, m);
- return IPPROTO_DONE;
+
+ if (egress_success == 0) {
+ ip6stat.ip6s_nogif++;
+ m_freem(m);
+ return (IPPROTO_DONE);
+ }
+
+ /* Replace the rcvif by gifp for ifnet_input to route it correctly */
+ if (m->m_pkthdr.rcvif)
+ m->m_pkthdr.rcvif = gifp;
+
+ ifnet_input(gifp, m, NULL);
+ return (IPPROTO_DONE);
}
/*
- * we know that we are in IFF_UP, outer address available, and outer family
- * matched the physical addr family. see gif_encapcheck().
+ * validate outer address.
*/
-int
-gif_encapcheck6(m, off, proto, arg)
- const struct mbuf *m;
- int off;
- int proto;
- void *arg;
+static int
+gif_validate6(
+ const struct ip6_hdr *ip6,
+ struct gif_softc *sc,
+ struct ifnet *ifp)
{
- struct ip6_hdr ip6;
- struct gif_softc *sc;
struct sockaddr_in6 *src, *dst;
- int addrmatch;
- /* sanity check done in caller */
- sc = (struct gif_softc *)arg;
- src = (struct sockaddr_in6 *)sc->gif_psrc;
- dst = (struct sockaddr_in6 *)sc->gif_pdst;
-
- /* LINTED const cast */
- m_copydata((struct mbuf *)m, 0, sizeof(ip6), (caddr_t)&ip6);
+ src = (struct sockaddr_in6 *)(void *)sc->gif_psrc;
+ dst = (struct sockaddr_in6 *)(void *)sc->gif_pdst;
- /* check for address match */
- addrmatch = 0;
- if (IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6.ip6_dst))
- addrmatch |= 1;
- if (IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6.ip6_src))
- addrmatch |= 2;
- if (addrmatch != 3)
- return 0;
+ /*
+ * Check for address match. Note that the check is for an incoming
+ * packet. We should compare the *source* address in our configuration
+ * and the *destination* address of the packet, and vice versa.
+ */
+ if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
+ !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
+ return (0);
/* martian filters on outer source - done in ip6_input */
/* ingress filters on outer source */
- if ((sc->gif_if.if_flags & IFF_LINK2) == 0 &&
- (m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
+ if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 && ifp) {
struct sockaddr_in6 sin6;
struct rtentry *rt;
- bzero(&sin6, sizeof(sin6));
+ bzero(&sin6, sizeof (sin6));
sin6.sin6_family = AF_INET6;
- sin6.sin6_len = sizeof(struct sockaddr_in6);
- sin6.sin6_addr = ip6.ip6_src;
- /* XXX scopeid */
- rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
- if (!rt || rt->rt_ifp != m->m_pkthdr.rcvif) {
+ sin6.sin6_len = sizeof (struct sockaddr_in6);
+ sin6.sin6_addr = ip6->ip6_src;
+
+ rt = rtalloc1((struct sockaddr *)&sin6, 0, 0);
+ if (rt != NULL)
+ RT_LOCK(rt);
+ if (!rt || rt->rt_ifp != ifp) {
#if 0
log(LOG_WARNING, "%s: packet from %s dropped "
"due to ingress filter\n", if_name(&sc->gif_if),
ip6_sprintf(&sin6.sin6_addr));
#endif
- if (rt)
+ if (rt != NULL) {
+ RT_UNLOCK(rt);
rtfree(rt);
- return 0;
+ }
+ return (0);
}
+ RT_UNLOCK(rt);
rtfree(rt);
}
- return 128 * 2;
+ return (128 * 2);
+}
+
+/*
+ * we know that we are in IFF_UP, outer address available, and outer family
+ * matched the physical addr family. see gif_encapcheck().
+ * sanity check for arg should have been done in the caller.
+ */
+int
+gif_encapcheck6(
+ const struct mbuf *m,
+ __unused int off,
+ __unused int proto,
+ void *arg)
+{
+ struct ip6_hdr ip6;
+ struct gif_softc *sc;
+ struct ifnet *ifp;
+
+ /* sanity check done in caller */
+ sc = (struct gif_softc *)arg;
+
+ GIF_LOCK_ASSERT(sc);
+
+ mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof (ip6), &ip6);
+ ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
+
+ return (gif_validate6(&ip6, sc, ifp));
}
projects / apple / xnu.git / blobdiff