427 lines
11 KiB
C
427 lines
11 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2000-2018 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@
|
||
|
|
*/
|
||
|
|
/* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
* 3. Neither the name of the project nor the names of its contributors
|
||
|
|
* may be used to endorse or promote products derived from this software
|
||
|
|
* without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
||
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
||
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
* SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#include <sys/param.h>
|
||
|
|
#include <sys/systm.h>
|
||
|
|
#include <sys/socket.h>
|
||
|
|
#include <sys/sockio.h>
|
||
|
|
#include <sys/mbuf.h>
|
||
|
|
#include <sys/errno.h>
|
||
|
|
#include <sys/kernel.h>
|
||
|
|
#include <sys/sysctl.h>
|
||
|
|
|
||
|
|
#include <sys/malloc.h>
|
||
|
|
#include <libkern/OSAtomic.h>
|
||
|
|
|
||
|
|
#include <net/if.h>
|
||
|
|
#include <net/route.h>
|
||
|
|
|
||
|
|
#include <netinet/in.h>
|
||
|
|
#include <netinet/in_systm.h>
|
||
|
|
#include <netinet/ip.h>
|
||
|
|
#include <netinet/ip_var.h>
|
||
|
|
#include <netinet/in_gif.h>
|
||
|
|
#include <netinet/in_var.h>
|
||
|
|
#include <netinet/ip_encap.h>
|
||
|
|
#include <netinet/ip_ecn.h>
|
||
|
|
|
||
|
|
#include <netinet/ip6.h>
|
||
|
|
|
||
|
|
#include <net/if_gif.h>
|
||
|
|
|
||
|
|
#include <net/net_osdep.h>
|
||
|
|
|
||
|
|
#include <net/sockaddr_utils.h>
|
||
|
|
|
||
|
|
int ip_gif_ttl = GIF_TTL;
|
||
|
|
SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW | CTLFLAG_LOCKED,
|
||
|
|
&ip_gif_ttl, 0, "");
|
||
|
|
|
||
|
|
int
|
||
|
|
in_gif_output(
|
||
|
|
struct ifnet *ifp,
|
||
|
|
int family,
|
||
|
|
struct mbuf *m,
|
||
|
|
__unused struct rtentry *rt)
|
||
|
|
{
|
||
|
|
struct gif_softc *sc = ifnet_softc(ifp);
|
||
|
|
struct sockaddr_in *dst = SIN(&sc->gif_ro.ro_dst);
|
||
|
|
struct sockaddr_in *sin_src = SIN(sc->gif_psrc);
|
||
|
|
struct sockaddr_in *sin_dst = SIN(sc->gif_pdst);
|
||
|
|
struct ip iphdr; /* capsule IP header, host byte ordered */
|
||
|
|
int proto, error;
|
||
|
|
u_int8_t tos;
|
||
|
|
struct ip_out_args ipoa;
|
||
|
|
|
||
|
|
bzero(&ipoa, sizeof(ipoa));
|
||
|
|
ipoa.ipoa_boundif = IFSCOPE_NONE;
|
||
|
|
ipoa.ipoa_flags = IPOAF_SELECT_SRCIF;
|
||
|
|
ipoa.ipoa_sotc = SO_TC_UNSPEC;
|
||
|
|
ipoa.ipoa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
|
||
|
|
|
||
|
|
GIF_LOCK_ASSERT(sc);
|
||
|
|
|
||
|
|
if (sin_src == NULL || sin_dst == NULL ||
|
||
|
|
sin_src->sin_family != AF_INET ||
|
||
|
|
sin_dst->sin_family != AF_INET) {
|
||
|
|
m_freem(m);
|
||
|
|
return EAFNOSUPPORT;
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (family) {
|
||
|
|
#if INET
|
||
|
|
case AF_INET:
|
||
|
|
{
|
||
|
|
struct ip *ip;
|
||
|
|
|
||
|
|
proto = IPPROTO_IPV4;
|
||
|
|
if (mbuf_len(m) < sizeof(*ip)) {
|
||
|
|
m = m_pullup(m, sizeof(*ip));
|
||
|
|
if (!m) {
|
||
|
|
return ENOBUFS;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ip = mtod(m, struct ip *);
|
||
|
|
tos = ip->ip_tos;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
#endif /* INET */
|
||
|
|
case AF_INET6:
|
||
|
|
{
|
||
|
|
struct ip6_hdr *ip6;
|
||
|
|
proto = IPPROTO_IPV6;
|
||
|
|
if (mbuf_len(m) < sizeof(*ip6)) {
|
||
|
|
m = m_pullup(m, sizeof(*ip6));
|
||
|
|
if (!m) {
|
||
|
|
return ENOBUFS;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
||
|
|
tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
default:
|
||
|
|
#if DEBUG
|
||
|
|
printf("in_gif_output: warning: unknown family %d passed\n",
|
||
|
|
family);
|
||
|
|
#endif
|
||
|
|
m_freem(m);
|
||
|
|
return EAFNOSUPPORT;
|
||
|
|
}
|
||
|
|
|
||
|
|
bzero(&iphdr, sizeof(iphdr));
|
||
|
|
iphdr.ip_src = sin_src->sin_addr;
|
||
|
|
/* bidirectional configured tunnel mode */
|
||
|
|
if (sin_dst->sin_addr.s_addr != INADDR_ANY) {
|
||
|
|
iphdr.ip_dst = sin_dst->sin_addr;
|
||
|
|
} else {
|
||
|
|
m_freem(m);
|
||
|
|
return ENETUNREACH;
|
||
|
|
}
|
||
|
|
iphdr.ip_p = proto;
|
||
|
|
/* version will be set in ip_output() */
|
||
|
|
iphdr.ip_ttl = ip_gif_ttl;
|
||
|
|
iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
|
||
|
|
if (ifp->if_flags & IFF_LINK1) {
|
||
|
|
ip_ecn_ingress(ECN_NORMAL, &iphdr.ip_tos, &tos);
|
||
|
|
} else {
|
||
|
|
ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* prepend new IP header */
|
||
|
|
M_PREPEND(m, sizeof(struct ip), M_DONTWAIT, 0);
|
||
|
|
if (m && mbuf_len(m) < sizeof(struct ip)) {
|
||
|
|
m = m_pullup(m, sizeof(struct ip));
|
||
|
|
}
|
||
|
|
if (m == NULL) {
|
||
|
|
printf("ENOBUFS in in_gif_output %d\n", __LINE__);
|
||
|
|
return ENOBUFS;
|
||
|
|
}
|
||
|
|
bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
|
||
|
|
|
||
|
|
if (ROUTE_UNUSABLE(&sc->gif_ro) ||
|
||
|
|
dst->sin_family != sin_dst->sin_family ||
|
||
|
|
dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr ||
|
||
|
|
(sc->gif_ro.ro_rt != NULL && sc->gif_ro.ro_rt->rt_ifp == ifp)) {
|
||
|
|
/* cache route doesn't match or recursive route */
|
||
|
|
dst->sin_family = sin_dst->sin_family;
|
||
|
|
dst->sin_len = sizeof(struct sockaddr_in);
|
||
|
|
dst->sin_addr = sin_dst->sin_addr;
|
||
|
|
ROUTE_RELEASE(&sc->gif_ro);
|
||
|
|
#if 0
|
||
|
|
sc->gif_if.if_mtu = GIF_MTU;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
if (sc->gif_ro.ro_rt == NULL) {
|
||
|
|
rtalloc(&sc->gif_ro);
|
||
|
|
if (sc->gif_ro.ro_rt == NULL) {
|
||
|
|
m_freem(m);
|
||
|
|
return ENETUNREACH;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* if it constitutes infinite encapsulation, punt. */
|
||
|
|
RT_LOCK(sc->gif_ro.ro_rt);
|
||
|
|
if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
|
||
|
|
RT_UNLOCK(sc->gif_ro.ro_rt);
|
||
|
|
m_freem(m);
|
||
|
|
return ENETUNREACH; /* XXX */
|
||
|
|
}
|
||
|
|
#if 0
|
||
|
|
ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
|
||
|
|
- sizeof(struct ip);
|
||
|
|
#endif
|
||
|
|
RT_UNLOCK(sc->gif_ro.ro_rt);
|
||
|
|
}
|
||
|
|
|
||
|
|
error = ip_output(m, NULL, &sc->gif_ro, IP_OUTARGS, NULL, &ipoa);
|
||
|
|
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
in_gif_input(struct mbuf *m, int off)
|
||
|
|
{
|
||
|
|
struct ifnet *gifp = NULL;
|
||
|
|
struct ip *ip;
|
||
|
|
int af, proto;
|
||
|
|
u_int8_t otos, old_tos;
|
||
|
|
int egress_success = 0;
|
||
|
|
int sum;
|
||
|
|
|
||
|
|
ip = mtod(m, struct ip *);
|
||
|
|
proto = ip->ip_p;
|
||
|
|
|
||
|
|
|
||
|
|
gifp = ((struct gif_softc *)encap_getarg(m))->gif_if;
|
||
|
|
|
||
|
|
if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
|
||
|
|
m_freem(m);
|
||
|
|
OSAddAtomic(1, &ipstat.ips_nogif);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
otos = ip->ip_tos;
|
||
|
|
m_adj(m, off);
|
||
|
|
|
||
|
|
switch (proto) {
|
||
|
|
#if INET
|
||
|
|
case IPPROTO_IPV4:
|
||
|
|
{
|
||
|
|
af = AF_INET;
|
||
|
|
if (mbuf_len(m) < sizeof(*ip)) {
|
||
|
|
m = m_pullup(m, sizeof(*ip));
|
||
|
|
if (!m) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ip = mtod(m, struct ip *);
|
||
|
|
if (gifp->if_flags & IFF_LINK1) {
|
||
|
|
old_tos = ip->ip_tos;
|
||
|
|
egress_success = ip_ecn_egress(ECN_NORMAL, &otos, &ip->ip_tos);
|
||
|
|
if (old_tos != ip->ip_tos) {
|
||
|
|
sum = ~ntohs(ip->ip_sum) & 0xffff;
|
||
|
|
sum += (~otos & 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, &otos, &ip->ip_tos);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
case IPPROTO_IPV6:
|
||
|
|
{
|
||
|
|
struct ip6_hdr *ip6;
|
||
|
|
u_int8_t itos;
|
||
|
|
af = AF_INET6;
|
||
|
|
if (mbuf_len(m) < sizeof(*ip6)) {
|
||
|
|
m = m_pullup(m, sizeof(*ip6));
|
||
|
|
if (!m) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
||
|
|
itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
|
||
|
|
if (gifp->if_flags & IFF_LINK1) {
|
||
|
|
egress_success = ip_ecn_egress(ECN_NORMAL, &otos, &itos);
|
||
|
|
} else {
|
||
|
|
egress_success = ip_ecn_egress(ECN_NOCARE, &otos, &itos);
|
||
|
|
}
|
||
|
|
ip6->ip6_flow &= ~htonl(0xff << 20);
|
||
|
|
ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
default:
|
||
|
|
OSAddAtomic(1, &ipstat.ips_nogif);
|
||
|
|
m_freem(m);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (egress_success == 0) {
|
||
|
|
OSAddAtomic(1, &ipstat.ips_nogif);
|
||
|
|
m_freem(m);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef __APPLE__
|
||
|
|
/* Replace the rcvif by gifp for dlil to route it correctly */
|
||
|
|
if (m->m_pkthdr.rcvif) {
|
||
|
|
m->m_pkthdr.rcvif = gifp;
|
||
|
|
}
|
||
|
|
ifnet_input(gifp, m, NULL);
|
||
|
|
#else
|
||
|
|
gif_input(m, af, gifp);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We know that we are in IFF_UP, outer address available, and outer family
|
||
|
|
* matched the physical addr family. see gif_encapcheck().
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
gif_encapcheck4(
|
||
|
|
const struct mbuf *m,
|
||
|
|
__unused int off,
|
||
|
|
__unused int proto,
|
||
|
|
void *arg)
|
||
|
|
{
|
||
|
|
struct ip ip;
|
||
|
|
struct gif_softc *sc;
|
||
|
|
struct sockaddr_in *src, *dst;
|
||
|
|
int addrmatch;
|
||
|
|
struct in_ifaddr *ia4;
|
||
|
|
|
||
|
|
/* sanity check done in caller */
|
||
|
|
sc = (struct gif_softc *)arg;
|
||
|
|
src = SIN(sc->gif_psrc);
|
||
|
|
dst = SIN(sc->gif_pdst);
|
||
|
|
|
||
|
|
GIF_LOCK_ASSERT(sc);
|
||
|
|
|
||
|
|
mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof(ip), &ip);
|
||
|
|
|
||
|
|
/* check for address match */
|
||
|
|
addrmatch = 0;
|
||
|
|
if (src->sin_addr.s_addr == ip.ip_dst.s_addr) {
|
||
|
|
addrmatch |= 1;
|
||
|
|
}
|
||
|
|
if (dst->sin_addr.s_addr == ip.ip_src.s_addr) {
|
||
|
|
addrmatch |= 2;
|
||
|
|
}
|
||
|
|
if (addrmatch != 3) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* martian filters on outer source - NOT done in ip_input! */
|
||
|
|
if (IN_MULTICAST(ntohl(ip.ip_src.s_addr))) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
|
||
|
|
case 0: case 127: case 255:
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
/* reject packets with broadcast on source */
|
||
|
|
lck_rw_lock_shared(&in_ifaddr_rwlock);
|
||
|
|
for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
|
||
|
|
ia4 = TAILQ_NEXT(ia4, ia_link)) {
|
||
|
|
if ((ifnet_flags(ia4->ia_ifa.ifa_ifp) & IFF_BROADCAST) == 0) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
IFA_LOCK(&ia4->ia_ifa);
|
||
|
|
if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
|
||
|
|
IFA_UNLOCK(&ia4->ia_ifa);
|
||
|
|
lck_rw_done(&in_ifaddr_rwlock);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
IFA_UNLOCK(&ia4->ia_ifa);
|
||
|
|
}
|
||
|
|
lck_rw_done(&in_ifaddr_rwlock);
|
||
|
|
|
||
|
|
/* ingress filters on outer source */
|
||
|
|
if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 &&
|
||
|
|
(m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
|
||
|
|
struct sockaddr_in sin;
|
||
|
|
struct rtentry *rt;
|
||
|
|
|
||
|
|
SOCKADDR_ZERO(&sin, sizeof(sin));
|
||
|
|
sin.sin_family = AF_INET;
|
||
|
|
sin.sin_len = sizeof(struct sockaddr_in);
|
||
|
|
sin.sin_addr = ip.ip_src;
|
||
|
|
rt = rtalloc1_scoped(SA(&sin), 0, 0,
|
||
|
|
m->m_pkthdr.rcvif->if_index);
|
||
|
|
if (rt != NULL) {
|
||
|
|
RT_LOCK(rt);
|
||
|
|
}
|
||
|
|
if (rt == NULL || rt->rt_ifp != m->m_pkthdr.rcvif) {
|
||
|
|
if (rt != NULL) {
|
||
|
|
RT_UNLOCK(rt);
|
||
|
|
rtfree(rt);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
RT_UNLOCK(rt);
|
||
|
|
rtfree(rt);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 32 * 2;
|
||
|
|
}
|