+/*
+ * Copyright (c) 2008-2010 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/esp_input.c,v 1.1.2.3 2001/07/03 11:01:50 ume Exp $ */
/* $KAME: esp_input.c,v 1.55 2001/03/23 08:08:47 itojun Exp $ */
#include <netinet/kpi_ipfilter_var.h>
#include <net/net_osdep.h>
+#include <mach/sdt.h>
#include <sys/kdebug.h>
#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIPSEC, 1)
(sizeof(struct esp) < sizeof(struct newesp) \
? sizeof(struct newesp) : sizeof(struct esp))
+static struct ip *
+esp4_input_strip_UDP_encap (struct mbuf *m, int iphlen)
+{
+ // strip the udp header that's encapsulating ESP
+ struct ip *ip;
+ size_t stripsiz = sizeof(struct udphdr);
+
+ ip = mtod(m, __typeof__(ip));
+ ovbcopy((caddr_t)ip, (caddr_t)(((u_char *)ip) + stripsiz), iphlen);
+ m->m_data += stripsiz;
+ m->m_len -= stripsiz;
+ m->m_pkthdr.len -= stripsiz;
+ ip = mtod(m, __typeof__(ip));
+ ip->ip_len = ip->ip_len - stripsiz;
+ ip->ip_p = IPPROTO_ESP;
+ return ip;
+}
+
void
esp4_input(m, off)
struct mbuf *m;
int off;
{
struct ip *ip;
+#if INET6
struct ip6_hdr *ip6;
+#endif /* INET6 */
struct esp *esp;
struct esptail esptail;
u_int32_t spi;
+ u_int32_t seq;
struct secasvar *sav = NULL;
size_t taillen;
u_int16_t nxt;
}
ip = mtod(m, struct ip *);
+ // expect udp-encap and esp packets only
+ if (ip->ip_p != IPPROTO_ESP &&
+ !(ip->ip_p == IPPROTO_UDP && off >= sizeof(struct udphdr))) {
+ ipseclog((LOG_DEBUG,
+ "IPv4 ESP input: invalid protocol type\n"));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
esp = (struct esp *)(((u_int8_t *)ip) + off);
#ifdef _IP_VHL
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
goto bad;
}
+ seq = ntohl(((struct newesp *)esp)->esp_seq);
if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
&& (sav->alg_auth && sav->key_auth)))
goto noreplaycheck;
/*
* check for sequence number.
*/
- if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav))
+ if (ipsec_chkreplay(seq, sav))
; /*okey*/
else {
IPSEC_STAT_INCREMENT(ipsecstat.in_espreplay);
if (AH_MAXSUMSIZE < siz) {
ipseclog((LOG_DEBUG,
"internal error: AH_MAXSUMSIZE must be larger than %lu\n",
- (u_long)siz));
+ (u_int32_t)siz));
IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto bad;
}
- m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]);
+ m_copydata(m, m->m_pkthdr.len - siz, siz, (caddr_t) &sum0[0]);
if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) {
ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n",
* update sequence number.
*/
if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
- if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) {
+ if (ipsec_updatereplay(seq, sav)) {
IPSEC_STAT_INCREMENT(ipsecstat.in_espreplay);
goto bad;
}
#else
ip->ip_len = htons(ntohs(ip->ip_len) - taillen);
#endif
+ if (ip->ip_p == IPPROTO_UDP) {
+ // offset includes the outer ip and udp header lengths.
+ if (m->m_len < off) {
+ m = m_pullup(m, off);
+ if (!m) {
+ ipseclog((LOG_DEBUG,
+ "IPv4 ESP input: invalid udp encapsulated ESP packet length \n"));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+ }
+
+ // check the UDP encap header to detect changes in the source port, and then strip the header
+ off -= sizeof(struct udphdr); // off no longer includes the udphdr's size
+ // if peer is behind nat and this is the latest esp packet
+ if ((sav->flags & SADB_X_EXT_NATT_DETECTED_PEER) != 0 &&
+ (sav->flags & SADB_X_EXT_OLD) == 0 &&
+ seq && sav->replay &&
+ seq >= sav->replay->lastseq) {
+ struct udphdr *encap_uh = (__typeof__(encap_uh))((caddr_t)ip + off);
+ if (encap_uh->uh_sport &&
+ encap_uh->uh_sport != sav->remote_ike_port) {
+ sav->remote_ike_port = encap_uh->uh_sport;
+ }
+ }
+ ip = esp4_input_strip_UDP_encap(m, off);
+ esp = (struct esp *)(((u_int8_t *)ip) + off);
+ }
/* was it transmitted over the IPsec tunnel SA? */
if (ipsec4_tunnel_validate(m, off + esplen + ivlen, nxt, sav, &ifamily)) {
+ ifaddr_t ifa;
+ struct sockaddr_storage addr;
+
/*
* strip off all the headers that precedes ESP header.
* IP4 xx ESP IP4' payload -> IP4' payload
tos = ip->ip_tos;
m_adj(m, off + esplen + ivlen);
if (ifamily == AF_INET) {
+ struct sockaddr_in *ipaddr;
+
if (m->m_len < sizeof(*ip)) {
m = m_pullup(m, sizeof(*ip));
if (!m) {
IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto bad;
}
+
+ if (ip_doscopedroute) {
+ bzero(&addr, sizeof(addr));
+ ipaddr = (__typeof__(ipaddr))&addr;
+ ipaddr->sin_family = AF_INET;
+ ipaddr->sin_len = sizeof(*ipaddr);
+ ipaddr->sin_addr = ip->ip_dst;
+ }
#if INET6
} else if (ifamily == AF_INET6) {
+ struct sockaddr_in6 *ip6addr;
+
#ifndef PULLDOWN_TEST
/*
* m_pullup is prohibited in KAME IPv6 input processing
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto bad;
- }
+ }
+
+ if (ip6_doscopedroute) {
+ bzero(&addr, sizeof(addr));
+ ip6addr = (__typeof__(ip6addr))&addr;
+ ip6addr->sin6_family = AF_INET6;
+ ip6addr->sin6_len = sizeof(*ip6addr);
+ ip6addr->sin6_addr = ip6->ip6_dst;
+ }
#endif /* INET6 */
} else {
ipseclog((LOG_ERR, "ipsec tunnel unsupported address family "
IPSEC_STAT_INCREMENT(ipsecstat.in_nomem);
goto bad;
}
-
+
+ if (ip_doscopedroute || ip6_doscopedroute) {
+ // update the receiving interface address based on the inner address
+ ifa = ifa_ifwithaddr((struct sockaddr *)&addr);
+ if (ifa) {
+ m->m_pkthdr.rcvif = ifa->ifa_ifp;
+ IFA_REMREF(ifa);
+ }
+ }
+
/* Clear the csum flags, they can't be valid for the inner headers */
m->m_pkthdr.csum_flags = 0;
- proto_input(ifamily == AF_INET ? PF_INET : PF_INET6, m);
+ if (proto_input(ifamily == AF_INET ? PF_INET : PF_INET6, m) != 0)
+ goto bad;
+
nxt = IPPROTO_DONE;
KERNEL_DEBUG(DBG_FNC_ESPIN | DBG_FUNC_END, 2,0,0,0,0);
} else {
udp->uh_sport = htons(sav->remote_ike_port);
udp->uh_sum = 0;
}
+
+ DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL,
+ struct ip *, ip, struct ifnet *, m->m_pkthdr.rcvif,
+ struct ip *, ip, struct ip6_hdr *, NULL);
+
ip_proto_dispatch_in(m, off, nxt, 0);
} else
m_freem(m);
#if INET6
int
-esp6_input(mp, offp)
- struct mbuf **mp;
- int *offp;
+esp6_input(struct mbuf **mp, int *offp, int proto)
{
+#pragma unused(proto)
struct mbuf *m = *mp;
int off = *offp;
struct ip6_hdr *ip6;
struct esp *esp;
struct esptail esptail;
u_int32_t spi;
+ u_int32_t seq;
struct secasvar *sav = NULL;
size_t taillen;
u_int16_t nxt;
goto bad;
}
+ seq = ntohl(((struct newesp *)esp)->esp_seq);
+
if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
&& (sav->alg_auth && sav->key_auth)))
goto noreplaycheck;
/*
* check for sequence number.
*/
- if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav))
+ if (ipsec_chkreplay(seq, sav))
; /*okey*/
else {
IPSEC_STAT_INCREMENT(ipsec6stat.in_espreplay);
if (AH_MAXSUMSIZE < siz) {
ipseclog((LOG_DEBUG,
"internal error: AH_MAXSUMSIZE must be larger than %lu\n",
- (u_long)siz));
+ (u_int32_t)siz));
IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto bad;
}
- m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]);
+ m_copydata(m, m->m_pkthdr.len - siz, siz, (caddr_t) &sum0[0]);
if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) {
ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n",
* update sequence number.
*/
if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
- if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) {
+ if (ipsec_updatereplay(seq, sav)) {
IPSEC_STAT_INCREMENT(ipsec6stat.in_espreplay);
goto bad;
}
/* was it transmitted over the IPsec tunnel SA? */
if (ipsec6_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) {
+ ifaddr_t ifa;
+ struct sockaddr_storage addr;
+
/*
* strip off all the headers that precedes ESP header.
* IP6 xx ESP IP6' payload -> IP6' payload
IPSEC_STAT_INCREMENT(ipsec6stat.in_nomem);
goto bad;
}
- proto_input(PF_INET6, m);
+
+ if (ip6_doscopedroute) {
+ struct sockaddr_in6 *ip6addr;
+
+ bzero(&addr, sizeof(addr));
+ ip6addr = (__typeof__(ip6addr))&addr;
+ ip6addr->sin6_family = AF_INET6;
+ ip6addr->sin6_len = sizeof(*ip6addr);
+ ip6addr->sin6_addr = ip6->ip6_dst;
+
+ // update the receiving interface address based on the inner address
+ ifa = ifa_ifwithaddr((struct sockaddr *)&addr);
+ if (ifa) {
+ m->m_pkthdr.rcvif = ifa->ifa_ifp;
+ IFA_REMREF(ifa);
+ }
+ }
+
+ if (proto_input(PF_INET6, m) != 0)
+ goto bad;
nxt = IPPROTO_DONE;
} else {
/*
projects / apple / xnu.git / blobdiff