-/* $KAME: esp_input.c,v 1.22 2000/03/21 05:14:49 itojun Exp $ */
+/*
+ * Copyright (c) 2008-2016 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/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 $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* SUCH DAMAGE.
*/
+#define _IP_VHL
+
/*
* RFC1827/2406 Encapsulated Security Payload.
*/
-#define _IP_VHL
-#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
-#include "opt_inet.h"
-#endif
-
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
+#include <sys/mcache.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <net/if.h>
+#include <net/if_ipsec.h>
#include <net/route.h>
-#include <net/netisr.h>
#include <kern/cpu_number.h>
+#include <kern/locks.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip_var.h>
#include <netinet/in_var.h>
#include <netinet/ip_ecn.h>
+#include <netinet/in_pcb.h>
+#include <netinet/udp.h>
+#include <netinet/tcp.h>
+#include <netinet/in_tclass.h>
+#include <netinet6/ip6_ecn.h>
-#if INET6
#include <netinet/ip6.h>
+#include <netinet6/in6_pcb.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
-#endif
+#include <netinet6/ip6protosw.h>
#include <netinet6/ipsec.h>
+#include <netinet6/ipsec6.h>
#include <netinet6/ah.h>
+#include <netinet6/ah6.h>
#include <netinet6/esp.h>
+#include <netinet6/esp6.h>
#include <netkey/key.h>
#include <netkey/keydb.h>
#include <netkey/key_debug.h>
+#include <net/kpi_protocol.h>
+#include <netinet/kpi_ipfilter_var.h>
#include <net/net_osdep.h>
-
+#include <mach/sdt.h>
+#include <corecrypto/cc.h>
+
+#include <sys/kdebug.h>
+#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIPSEC, 1)
+#define DBG_LAYER_END NETDBG_CODE(DBG_NETIPSEC, 3)
+#define DBG_FNC_ESPIN NETDBG_CODE(DBG_NETIPSEC, (6 << 8))
+#define DBG_FNC_DECRYPT NETDBG_CODE(DBG_NETIPSEC, (7 << 8))
#define IPLEN_FLIPPED
-#if INET
-extern struct protosw inetsw[];
-#if defined(__bsdi__) || defined(__NetBSD__)
-extern u_char ip_protox[];
-#endif
+extern lck_mtx_t *sadb_mutex;
#define ESPMAXLEN \
(sizeof(struct esp) < sizeof(struct newesp) \
- ? sizeof(struct newesp) : sizeof(struct esp))
+ ? 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;
+ u_int8_t stripsiz = (u_int8_t)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;
+}
+
+static struct ip6_hdr *
+esp6_input_strip_udp_encap(struct mbuf *m, int ip6hlen)
+{
+ // strip the udp header that's encapsulating ESP
+ struct ip6_hdr *ip6;
+ u_int8_t stripsiz = (u_int8_t)sizeof(struct udphdr);
+
+ ip6 = mtod(m, __typeof__(ip6));
+ ovbcopy((caddr_t)ip6, (caddr_t)(((u_char *)ip6) + stripsiz), ip6hlen);
+ m->m_data += stripsiz;
+ m->m_len -= stripsiz;
+ m->m_pkthdr.len -= stripsiz;
+ ip6 = mtod(m, __typeof__(ip6));
+ ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz);
+ ip6->ip6_nxt = IPPROTO_ESP;
+ return ip6;
+}
+
+static void
+esp_input_log(struct mbuf *m, struct secasvar *sav, u_int32_t spi, u_int32_t seq)
+{
+ if (net_mpklog_enabled &&
+ (sav->sah->ipsec_if->if_xflags & IFXF_MPK_LOG) == IFXF_MPK_LOG) {
+ struct tcphdr th = {};
+ u_int32_t proto_len = 0;
+ u_int8_t iphlen = 0;
+ u_int8_t proto = 0;
+
+ struct ip *inner_ip = mtod(m, struct ip *);
+ if (IP_VHL_V(inner_ip->ip_vhl) == 4) {
+ iphlen = (u_int8_t)(IP_VHL_HL(inner_ip->ip_vhl) << 2);
+ proto = inner_ip->ip_p;
+ } else if (IP_VHL_V(inner_ip->ip_vhl) == 6) {
+ struct ip6_hdr *inner_ip6 = mtod(m, struct ip6_hdr *);
+ iphlen = sizeof(struct ip6_hdr);
+ proto = inner_ip6->ip6_nxt;
+ }
+
+ if (proto == IPPROTO_TCP) {
+ if ((int)(iphlen + sizeof(th)) <= m->m_pkthdr.len) {
+ m_copydata(m, iphlen, sizeof(th), (u_int8_t *)&th);
+ }
+
+ proto_len = m->m_pkthdr.len - iphlen - (th.th_off << 2);
+ MPKL_ESP_INPUT_TCP(esp_mpkl_log_object,
+ ntohl(spi), seq,
+ ntohs(th.th_sport), ntohs(th.th_dport),
+ ntohl(th.th_seq), proto_len);
+ }
+ }
+}
void
-esp4_input(m, off)
- struct mbuf *m;
- int off;
+esp4_input(struct mbuf *m, int off)
+{
+ (void)esp4_input_extended(m, off, NULL);
+}
+
+struct mbuf *
+esp4_input_extended(struct mbuf *m, int off, ifnet_t interface)
{
struct ip *ip;
+ 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;
- struct esp_algorithm *algo;
+ const struct esp_algorithm *algo;
int ivlen;
- size_t hlen;
size_t esplen;
- int s;
+ u_int8_t hlen;
+ sa_family_t ifamily;
+ struct mbuf *out_m = NULL;
+ mbuf_traffic_class_t traffic_class = 0;
+ KERNEL_DEBUG(DBG_FNC_ESPIN | DBG_FUNC_START, 0, 0, 0, 0, 0);
/* sanity check for alignment. */
if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) {
ipseclog((LOG_ERR, "IPv4 ESP input: packet alignment problem "
- "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len));
- ipsecstat.in_inval++;
+ "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto bad;
}
if (!m) {
ipseclog((LOG_DEBUG,
"IPv4 ESP input: can't pullup in esp4_input\n"));
- ipsecstat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto bad;
}
}
+ m->m_pkthdr.csum_flags &= ~CSUM_RX_FLAGS;
+
+ /* Expect 32-bit aligned data pointer on strict-align platforms */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
+
ip = mtod(m, struct ip *);
- esp = (struct esp *)(((u_int8_t *)ip) + off);
+ // 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 *)(void *)(((u_int8_t *)ip) + off);
#ifdef _IP_VHL
- hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ hlen = (u_int8_t)(IP_VHL_HL(ip->ip_vhl) << 2);
#else
hlen = ip->ip_hl << 2;
#endif
/* find the sassoc. */
spi = esp->esp_spi;
- if ((sav = key_allocsa(AF_INET,
- (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst,
- IPPROTO_ESP, spi)) == 0) {
+ if ((sav = key_allocsa_extended(AF_INET,
+ (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst,
+ IPPROTO_ESP, spi, interface)) == 0) {
ipseclog((LOG_WARNING,
- "IPv4 ESP input: no key association found for spi %u\n",
- (u_int32_t)ntohl(spi)));
- ipsecstat.in_nosa++;
+ "IPv4 ESP input: no key association found for spi %u (0x%08x)\n",
+ (u_int32_t)ntohl(spi), (u_int32_t)ntohl(spi)));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_nosa);
goto bad;
}
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP esp4_input called to allocate SA:%p\n", sav));
+ printf("DP esp4_input called to allocate SA:0x%llx\n",
+ (uint64_t)VM_KERNEL_ADDRPERM(sav)));
if (sav->state != SADB_SASTATE_MATURE
- && sav->state != SADB_SASTATE_DYING) {
+ && sav->state != SADB_SASTATE_DYING) {
ipseclog((LOG_DEBUG,
- "IPv4 ESP input: non-mature/dying SA found for spi %u\n",
- (u_int32_t)ntohl(spi)));
- ipsecstat.in_badspi++;
+ "IPv4 ESP input: non-mature/dying SA found for spi %u (0x%08x)\n",
+ (u_int32_t)ntohl(spi), (u_int32_t)ntohl(spi)));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_badspi);
goto bad;
}
- if (sav->alg_enc == SADB_EALG_NONE) {
+ algo = esp_algorithm_lookup(sav->alg_enc);
+ if (!algo) {
ipseclog((LOG_DEBUG, "IPv4 ESP input: "
- "unspecified encryption algorithm for spi %u\n",
- (u_int32_t)ntohl(spi)));
- ipsecstat.in_badspi++;
+ "unsupported encryption algorithm for spi %u (0x%08x)\n",
+ (u_int32_t)ntohl(spi), (u_int32_t)ntohl(spi)));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_badspi);
goto bad;
}
- algo = &esp_algorithms[sav->alg_enc]; /*XXX*/
-
/* check if we have proper ivlen information */
ivlen = sav->ivlen;
if (ivlen < 0) {
ipseclog((LOG_ERR, "inproper ivlen in IPv4 ESP input: %s %s\n",
ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
- ipsecstat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto bad;
}
- if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
- && (sav->alg_auth && sav->key_auth)))
+ seq = ntohl(((struct newesp *)esp)->esp_seq);
+
+ if ((sav->flags2 & SADB_X_EXT_SA2_SEQ_PER_TRAFFIC_CLASS) ==
+ SADB_X_EXT_SA2_SEQ_PER_TRAFFIC_CLASS) {
+ u_int8_t dscp = ip->ip_tos >> IPTOS_DSCP_SHIFT;
+ traffic_class = rfc4594_dscp_to_tc(dscp);
+ }
+
+ /* Save ICV from packet for verification later */
+ size_t siz = 0;
+ unsigned char saved_icv[AH_MAXSUMSIZE];
+ if (algo->finalizedecrypt) {
+ siz = algo->icvlen;
+ VERIFY(siz <= USHRT_MAX);
+ m_copydata(m, m->m_pkthdr.len - (u_short)siz, (u_short)siz, (caddr_t) saved_icv);
+ goto delay_icv;
+ }
+
+ if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay[traffic_class] != NULL &&
+ (sav->alg_auth && sav->key_auth))) {
goto noreplaycheck;
+ }
- if (sav->alg_auth == SADB_AALG_NULL)
+ if (sav->alg_auth == SADB_X_AALG_NULL ||
+ sav->alg_auth == SADB_AALG_NONE) {
goto noreplaycheck;
+ }
/*
* check for sequence number.
*/
- if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav))
+ _CASSERT(MBUF_TC_MAX <= UINT8_MAX);
+ if (ipsec_chkreplay(seq, sav, (u_int8_t)traffic_class)) {
; /*okey*/
- else {
- ipsecstat.in_espreplay++;
+ } else {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_espreplay);
ipseclog((LOG_WARNING,
"replay packet in IPv4 ESP input: %s %s\n",
ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
}
/* check ICV */
- {
- u_char sum0[AH_MAXSUMSIZE];
- u_char sum[AH_MAXSUMSIZE];
- struct ah_algorithm *sumalgo;
- size_t siz;
-
- sumalgo = &ah_algorithms[sav->alg_auth];
- siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
- if (AH_MAXSUMSIZE < siz) {
- ipseclog((LOG_DEBUG,
- "internal error: AH_MAXSUMSIZE must be larger than %lu\n",
- (u_long)siz));
- ipsecstat.in_inval++;
- goto bad;
- }
+ {
+ u_char sum0[AH_MAXSUMSIZE] __attribute__((aligned(4)));
+ u_char sum[AH_MAXSUMSIZE] __attribute__((aligned(4)));
+ const struct ah_algorithm *sumalgo;
+
+ sumalgo = ah_algorithm_lookup(sav->alg_auth);
+ if (!sumalgo) {
+ goto noreplaycheck;
+ }
+ siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
+ if (m->m_pkthdr.len < off + ESPMAXLEN + siz) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+ if (AH_MAXSUMSIZE < siz) {
+ ipseclog((LOG_DEBUG,
+ "internal error: AH_MAXSUMSIZE must be larger than %u\n",
+ (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 - (int)siz, (int)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",
- ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
- ipsecstat.in_espauthfail++;
- goto bad;
- }
+ 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",
+ ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_espauthfail);
+ goto bad;
+ }
- if (bcmp(sum0, sum, siz) != 0) {
- ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n",
- ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
- ipsecstat.in_espauthfail++;
- goto bad;
- }
+ if (cc_cmp_safe(siz, sum0, sum)) {
+ ipseclog((LOG_WARNING, "cc_cmp fail in IPv4 ESP input: %s %s\n",
+ ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_espauthfail);
+ goto bad;
+ }
- /* strip off the authentication data */
- m_adj(m, -siz);
- ip = mtod(m, struct ip *);
+delay_icv:
+
+ /* strip off the authentication data */
+ m_adj(m, (int)-siz);
+ ip = mtod(m, struct ip *);
#ifdef IPLEN_FLIPPED
- ip->ip_len = ip->ip_len - siz;
+ ip->ip_len = ip->ip_len - (u_short)siz;
#else
- ip->ip_len = htons(ntohs(ip->ip_len) - siz);
+ ip->ip_len = htons(ntohs(ip->ip_len) - siz);
#endif
- m->m_flags |= M_AUTHIPDGM;
- ipsecstat.in_espauthsucc++;
- }
+ m->m_flags |= M_AUTHIPDGM;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_espauthsucc);
+ }
/*
* update sequence number.
*/
- if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
- if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) {
- ipsecstat.in_espreplay++;
+ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay[traffic_class] != NULL) {
+ if (ipsec_updatereplay(seq, sav, (u_int8_t)traffic_class)) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_espreplay);
goto bad;
}
}
esplen = sizeof(struct esp);
} else {
/* RFC 2406 */
- if (sav->flags & SADB_X_EXT_DERIV)
+ if (sav->flags & SADB_X_EXT_DERIV) {
esplen = sizeof(struct esp);
- else
+ } else {
esplen = sizeof(struct newesp);
+ }
}
if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) {
ipseclog((LOG_WARNING,
"IPv4 ESP input: packet too short\n"));
- ipsecstat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto bad;
}
if (m->m_len < off + esplen + ivlen) {
- m = m_pullup(m, off + esplen + ivlen);
+ m = m_pullup(m, (int)(off + esplen + ivlen));
if (!m) {
ipseclog((LOG_DEBUG,
"IPv4 ESP input: can't pullup in esp4_input\n"));
- ipsecstat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto bad;
}
}
- {
+ /*
+ * pre-compute and cache intermediate key
+ */
+ if (esp_schedule(algo, sav) != 0) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+
/*
* decrypt the packet.
*/
- if (!algo->decrypt)
+ if (!algo->decrypt) {
panic("internal error: no decrypt function");
+ }
+ KERNEL_DEBUG(DBG_FNC_DECRYPT | DBG_FUNC_START, 0, 0, 0, 0, 0);
if ((*algo->decrypt)(m, off, sav, algo, ivlen)) {
- ipseclog((LOG_ERR, "decrypt fail in IPv4 ESP input: %s %s\n",
- ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
- ipsecstat.in_inval++;
+ /* m is already freed */
+ m = NULL;
+ ipseclog((LOG_ERR, "decrypt fail in IPv4 ESP input: %s\n",
+ ipsec_logsastr(sav)));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ KERNEL_DEBUG(DBG_FNC_DECRYPT | DBG_FUNC_END, 1, 0, 0, 0, 0);
goto bad;
}
- ipsecstat.in_esphist[sav->alg_enc]++;
+ KERNEL_DEBUG(DBG_FNC_DECRYPT | DBG_FUNC_END, 2, 0, 0, 0, 0);
+ IPSEC_STAT_INCREMENT(ipsecstat.in_esphist[sav->alg_enc]);
m->m_flags |= M_DECRYPTED;
- }
+
+ if (algo->finalizedecrypt) {
+ if ((*algo->finalizedecrypt)(sav, saved_icv, algo->icvlen)) {
+ ipseclog((LOG_ERR, "esp4 packet decryption ICV failure\n"));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ KERNEL_DEBUG(DBG_FNC_DECRYPT | DBG_FUNC_END, 1, 0, 0, 0, 0);
+ goto bad;
+ }
+ }
/*
* find the trailer of the ESP.
*/
m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail),
- (caddr_t)&esptail);
+ (caddr_t)&esptail);
nxt = esptail.esp_nxt;
taillen = esptail.esp_padlen + sizeof(esptail);
if (m->m_pkthdr.len < taillen
- || m->m_pkthdr.len - taillen < hlen) { /*?*/
+ || m->m_pkthdr.len - taillen < hlen) { /*?*/
ipseclog((LOG_WARNING,
"bad pad length in IPv4 ESP input: %s %s\n",
ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
- ipsecstat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto bad;
}
/* strip off the trailing pad area. */
- m_adj(m, -taillen);
-
+ m_adj(m, (int)-taillen);
+ ip = mtod(m, struct ip *);
#ifdef IPLEN_FLIPPED
- ip->ip_len = ip->ip_len - taillen;
+ ip->ip_len = ip->ip_len - (u_short)taillen;
#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;
+ }
+ ip = mtod(m, struct ip *);
+ }
+
+ // 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[traffic_class] &&
+ seq >= sav->replay[traffic_class]->lastseq) {
+ struct udphdr *encap_uh = (__typeof__(encap_uh))(void *)((caddr_t)ip + off);
+ if (encap_uh->uh_sport &&
+ ntohs(encap_uh->uh_sport) != sav->remote_ike_port) {
+ sav->remote_ike_port = ntohs(encap_uh->uh_sport);
+ }
+ }
+ ip = esp4_input_strip_udp_encap(m, off);
+ esp = (struct esp *)(void *)(((u_int8_t *)ip) + off);
+ }
/* was it transmitted over the IPsec tunnel SA? */
- if (ipsec4_tunnel_validate(ip, nxt, sav)) {
+ if (ipsec4_tunnel_validate(m, (int)(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
* XXX more sanity checks
* XXX relationship with gif?
*/
- u_int8_t tos;
+ u_int8_t tos, otos;
+ int sum;
tos = ip->ip_tos;
- m_adj(m, off + esplen + ivlen);
- if (m->m_len < sizeof(*ip)) {
- m = m_pullup(m, sizeof(*ip));
- if (!m) {
- ipsecstat.in_inval++;
+ m_adj(m, (int)(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;
+ }
+ }
+ ip = mtod(m, struct ip *);
+ /* ECN consideration. */
+
+ otos = ip->ip_tos;
+ if (ip_ecn_egress(ip4_ipsec_ecn, &tos, &ip->ip_tos) == 0) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto bad;
}
- }
- ip = mtod(m, struct ip *);
- /* ECN consideration. */
- ip_ecn_egress(ip4_ipsec_ecn, &tos, &ip->ip_tos);
- if (!key_checktunnelsanity(sav, AF_INET,
+
+ if (otos != 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);
+ }
+
+ if (!key_checktunnelsanity(sav, AF_INET,
(caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst)) {
- ipseclog((LOG_ERR, "ipsec tunnel address mismatch "
- "in IPv4 ESP input: %s %s\n",
- ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
- ipsecstat.in_inval++;
+ ipseclog((LOG_ERR, "ipsec tunnel address mismatch "
+ "in ESP input: %s %s\n",
+ ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+
+ bzero(&addr, sizeof(addr));
+ ipaddr = (__typeof__(ipaddr)) & addr;
+ ipaddr->sin_family = AF_INET;
+ ipaddr->sin_len = sizeof(*ipaddr);
+ ipaddr->sin_addr = ip->ip_dst;
+ } else if (ifamily == AF_INET6) {
+ struct sockaddr_in6 *ip6addr;
+
+ /*
+ * m_pullup is prohibited in KAME IPv6 input processing
+ * but there's no other way!
+ */
+ if (m->m_len < sizeof(*ip6)) {
+ m = m_pullup(m, sizeof(*ip6));
+ if (!m) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+ }
+
+ /*
+ * Expect 32-bit aligned data pointer on strict-align
+ * platforms.
+ */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
+
+ ip6 = mtod(m, struct ip6_hdr *);
+
+ /* ECN consideration. */
+ if (ip64_ecn_egress(ip4_ipsec_ecn, &tos, &ip6->ip6_flow) == 0) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+
+ if (!key_checktunnelsanity(sav, AF_INET6,
+ (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst)) {
+ ipseclog((LOG_ERR, "ipsec tunnel address mismatch "
+ "in ESP input: %s %s\n",
+ ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+
+ bzero(&addr, sizeof(addr));
+ ip6addr = (__typeof__(ip6addr)) & addr;
+ ip6addr->sin6_family = AF_INET6;
+ ip6addr->sin6_len = sizeof(*ip6addr);
+ ip6addr->sin6_addr = ip6->ip6_dst;
+ } else {
+ ipseclog((LOG_ERR, "ipsec tunnel unsupported address family "
+ "in ESP input\n"));
goto bad;
}
-#if 0 /* XXX should call ipfw rather than ipsec_in_reject, shouldn't it ? */
- /* drop it if it does not match the default policy */
- if (ipsec4_in_reject(m, NULL)) {
- ipsecstat.in_polvio++;
+ key_sa_recordxfer(sav, m);
+ if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 ||
+ ipsec_addhist(m, IPPROTO_IPV4, 0) != 0) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_nomem);
goto bad;
}
-#endif
- key_sa_recordxfer(sav, m);
+ // 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;
+
+ // Input via IPsec interface
+ lck_mtx_lock(sadb_mutex);
+ ifnet_t ipsec_if = sav->sah->ipsec_if;
+ if (ipsec_if != NULL) {
+ // If an interface is found, add a reference count before dropping the lock
+ ifnet_reference(ipsec_if);
+ }
+ lck_mtx_unlock(sadb_mutex);
+ if (ipsec_if != NULL) {
+ esp_input_log(m, sav, spi, seq);
+ ipsec_save_wake_packet(m, ntohl(spi), seq);
+
+ // Return mbuf
+ if (interface != NULL &&
+ interface == ipsec_if) {
+ out_m = m;
+ ifnet_release(ipsec_if);
+ goto done;
+ }
+
+ errno_t inject_error = ipsec_inject_inbound_packet(ipsec_if, m);
+ ifnet_release(ipsec_if);
+
+ if (inject_error == 0) {
+ m = NULL;
+ goto done;
+ } else {
+ goto bad;
+ }
+ }
- s = splimp();
- if (IF_QFULL(&ipintrq)) {
- ipsecstat.in_inval++;
+ if (proto_input(ifamily == AF_INET ? PF_INET : PF_INET6, m) != 0) {
goto bad;
}
- IF_ENQUEUE(&ipintrq, m);
- m = NULL;
- schednetisr(NETISR_IP); /*can be skipped but to make sure*/
- splx(s);
+
nxt = IPPROTO_DONE;
+ KERNEL_DEBUG(DBG_FNC_ESPIN | DBG_FUNC_END, 2, 0, 0, 0, 0);
} else {
/*
* strip off ESP header and IV.
ip = mtod(m, struct ip *);
#ifdef IPLEN_FLIPPED
- ip->ip_len = ip->ip_len - stripsiz;
+ ip->ip_len = ip->ip_len - (u_short)stripsiz;
#else
ip->ip_len = htons(ntohs(ip->ip_len) - stripsiz);
#endif
- ip->ip_p = nxt;
+ ip->ip_p = (u_int8_t)nxt;
key_sa_recordxfer(sav, m);
+ if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_nomem);
+ goto bad;
+ }
- if (nxt != IPPROTO_DONE)
- (*ip_protox[nxt]->pr_input)(m, off);
- else
+ /*
+ * Set the csum valid flag, if we authenticated the
+ * packet, the payload shouldn't be corrupt unless
+ * it was corrupted before being signed on the other
+ * side.
+ */
+ if (nxt == IPPROTO_TCP || nxt == IPPROTO_UDP) {
+ m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
+ m->m_pkthdr.csum_data = 0xFFFF;
+ _CASSERT(offsetof(struct pkthdr, csum_data) == offsetof(struct pkthdr, csum_rx_val));
+ }
+
+ if (nxt != IPPROTO_DONE) {
+ if ((ip_protox[nxt]->pr_flags & PR_LASTHDR) != 0 &&
+ ipsec4_in_reject(m, NULL)) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_polvio);
+ goto bad;
+ }
+ KERNEL_DEBUG(DBG_FNC_ESPIN | DBG_FUNC_END, 3, 0, 0, 0, 0);
+
+ /* translate encapsulated UDP port ? */
+ if ((sav->flags & SADB_X_EXT_NATT_MULTIPLEUSERS) != 0) {
+ struct udphdr *udp;
+
+ if (nxt != IPPROTO_UDP) { /* not UPD packet - drop it */
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+
+ if (m->m_len < off + sizeof(struct udphdr)) {
+ m = m_pullup(m, off + sizeof(struct udphdr));
+ if (!m) {
+ ipseclog((LOG_DEBUG,
+ "IPv4 ESP input: can't pullup UDP header in esp4_input\n"));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+ ip = mtod(m, struct ip *);
+ }
+ udp = (struct udphdr *)(void *)(((u_int8_t *)ip) + off);
+
+ lck_mtx_lock(sadb_mutex);
+ if (sav->natt_encapsulated_src_port == 0) {
+ sav->natt_encapsulated_src_port = udp->uh_sport;
+ } else if (sav->natt_encapsulated_src_port != udp->uh_sport) { /* something wrong */
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ lck_mtx_unlock(sadb_mutex);
+ goto bad;
+ }
+ lck_mtx_unlock(sadb_mutex);
+ 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);
+
+ // Input via IPsec interface legacy path
+ lck_mtx_lock(sadb_mutex);
+ ifnet_t ipsec_if = sav->sah->ipsec_if;
+ if (ipsec_if != NULL) {
+ // If an interface is found, add a reference count before dropping the lock
+ ifnet_reference(ipsec_if);
+ }
+ lck_mtx_unlock(sadb_mutex);
+ if (ipsec_if != NULL) {
+ int mlen;
+ if ((mlen = m_length2(m, NULL)) < hlen) {
+ ipseclog((LOG_DEBUG,
+ "IPv4 ESP input: decrypted packet too short %d < %u\n",
+ mlen, hlen));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ ifnet_release(ipsec_if);
+ goto bad;
+ }
+ ip->ip_len = htons(ip->ip_len + hlen);
+ ip->ip_off = htons(ip->ip_off);
+ ip->ip_sum = 0;
+ ip->ip_sum = ip_cksum_hdr_in(m, hlen);
+
+ esp_input_log(m, sav, spi, seq);
+ ipsec_save_wake_packet(m, ntohl(spi), seq);
+
+ // Return mbuf
+ if (interface != NULL &&
+ interface == ipsec_if) {
+ out_m = m;
+ ifnet_release(ipsec_if);
+ goto done;
+ }
+
+ errno_t inject_error = ipsec_inject_inbound_packet(ipsec_if, m);
+ ifnet_release(ipsec_if);
+
+ if (inject_error == 0) {
+ m = NULL;
+ goto done;
+ } else {
+ goto bad;
+ }
+ }
+
+ ip_proto_dispatch_in(m, off, (u_int8_t)nxt, 0);
+ } else {
m_freem(m);
+ }
m = NULL;
}
+done:
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP esp4_input call free SA:%p\n", sav));
- key_freesav(sav);
+ printf("DP esp4_input call free SA:0x%llx\n",
+ (uint64_t)VM_KERNEL_ADDRPERM(sav)));
+ key_freesav(sav, KEY_SADB_UNLOCKED);
}
- ipsecstat.in_success++;
- return;
-
+ IPSEC_STAT_INCREMENT(ipsecstat.in_success);
+ return out_m;
bad:
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP esp4_input call free SA:%p\n", sav));
- key_freesav(sav);
+ printf("DP esp4_input call free SA:0x%llx\n",
+ (uint64_t)VM_KERNEL_ADDRPERM(sav)));
+ key_freesav(sav, KEY_SADB_UNLOCKED);
}
- if (m)
+ if (m) {
m_freem(m);
- return;
+ }
+ KERNEL_DEBUG(DBG_FNC_ESPIN | DBG_FUNC_END, 4, 0, 0, 0, 0);
+ return out_m;
+}
+
+int
+esp6_input(struct mbuf **mp, int *offp, int proto)
+{
+ return esp6_input_extended(mp, offp, proto, NULL);
}
-#endif /* INET */
-#if INET6
int
-esp6_input(mp, offp, proto)
- struct mbuf **mp;
- int *offp, proto;
+esp6_input_extended(struct mbuf **mp, int *offp, int proto, ifnet_t interface)
{
+#pragma unused(proto)
struct mbuf *m = *mp;
int off = *offp;
+ struct ip *ip;
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;
- struct esp_algorithm *algo;
+ char *nproto;
+ const struct esp_algorithm *algo;
int ivlen;
size_t esplen;
- int s;
+ u_int16_t taillen;
+ sa_family_t ifamily;
+ mbuf_traffic_class_t traffic_class = 0;
/* sanity check for alignment. */
if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) {
ipseclog((LOG_ERR, "IPv6 ESP input: packet alignment problem "
- "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len));
- ipsec6stat.in_inval++;
+ "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto bad;
}
#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, off, ESPMAXLEN, IPPROTO_DONE);
- esp = (struct esp *)(mtod(m, caddr_t) + off);
+ IP6_EXTHDR_CHECK(m, off, ESPMAXLEN, {return IPPROTO_DONE;});
+ esp = (struct esp *)(void *)(mtod(m, caddr_t) + off);
#else
IP6_EXTHDR_GET(esp, struct esp *, m, off, ESPMAXLEN);
if (esp == NULL) {
- ipsec6stat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
return IPPROTO_DONE;
}
#endif
+ m->m_pkthdr.csum_flags &= ~CSUM_RX_FLAGS;
+
+ /* Expect 32-bit data aligned pointer on strict-align platforms */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
+
ip6 = mtod(m, struct ip6_hdr *);
if (ntohs(ip6->ip6_plen) == 0) {
ipseclog((LOG_ERR, "IPv6 ESP input: "
"ESP with IPv6 jumbogram is not supported.\n"));
- ipsec6stat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
+ goto bad;
+ }
+
+ nproto = ip6_get_prevhdr(m, off);
+ if (nproto == NULL || (*nproto != IPPROTO_ESP &&
+ !(*nproto == IPPROTO_UDP && off >= sizeof(struct udphdr)))) {
+ ipseclog((LOG_DEBUG, "IPv6 ESP input: invalid protocol type\n"));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto bad;
}
/* find the sassoc. */
spi = esp->esp_spi;
- if ((sav = key_allocsa(AF_INET6,
- (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst,
- IPPROTO_ESP, spi)) == 0) {
+ if ((sav = key_allocsa_extended(AF_INET6,
+ (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst,
+ IPPROTO_ESP, spi, interface)) == 0) {
ipseclog((LOG_WARNING,
- "IPv6 ESP input: no key association found for spi %u\n",
- (u_int32_t)ntohl(spi)));
- ipsec6stat.in_nosa++;
+ "IPv6 ESP input: no key association found for spi %u (0x%08x) seq %u"
+ " src %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
+ " dst %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x if %s\n",
+ (u_int32_t)ntohl(spi), (u_int32_t)ntohl(spi), ntohl(((struct newesp *)esp)->esp_seq),
+ ntohs(ip6->ip6_src.__u6_addr.__u6_addr16[0]), ntohs(ip6->ip6_src.__u6_addr.__u6_addr16[1]),
+ ntohs(ip6->ip6_src.__u6_addr.__u6_addr16[2]), ntohs(ip6->ip6_src.__u6_addr.__u6_addr16[3]),
+ ntohs(ip6->ip6_src.__u6_addr.__u6_addr16[4]), ntohs(ip6->ip6_src.__u6_addr.__u6_addr16[5]),
+ ntohs(ip6->ip6_src.__u6_addr.__u6_addr16[6]), ntohs(ip6->ip6_src.__u6_addr.__u6_addr16[7]),
+ ntohs(ip6->ip6_dst.__u6_addr.__u6_addr16[0]), ntohs(ip6->ip6_dst.__u6_addr.__u6_addr16[1]),
+ ntohs(ip6->ip6_dst.__u6_addr.__u6_addr16[2]), ntohs(ip6->ip6_dst.__u6_addr.__u6_addr16[3]),
+ ntohs(ip6->ip6_dst.__u6_addr.__u6_addr16[4]), ntohs(ip6->ip6_dst.__u6_addr.__u6_addr16[5]),
+ ntohs(ip6->ip6_dst.__u6_addr.__u6_addr16[6]), ntohs(ip6->ip6_dst.__u6_addr.__u6_addr16[7]),
+ ((interface != NULL) ? if_name(interface) : "NONE")));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_nosa);
goto bad;
}
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP esp6_input called to allocate SA:%p\n", sav));
+ printf("DP esp6_input called to allocate SA:0x%llx\n",
+ (uint64_t)VM_KERNEL_ADDRPERM(sav)));
if (sav->state != SADB_SASTATE_MATURE
- && sav->state != SADB_SASTATE_DYING) {
+ && sav->state != SADB_SASTATE_DYING) {
ipseclog((LOG_DEBUG,
- "IPv6 ESP input: non-mature/dying SA found for spi %u\n",
- (u_int32_t)ntohl(spi)));
- ipsec6stat.in_badspi++;
+ "IPv6 ESP input: non-mature/dying SA found for spi %u (0x%08x)\n",
+ (u_int32_t)ntohl(spi), (u_int32_t)ntohl(spi)));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_badspi);
goto bad;
}
- if (sav->alg_enc == SADB_EALG_NONE) {
+ algo = esp_algorithm_lookup(sav->alg_enc);
+ if (!algo) {
ipseclog((LOG_DEBUG, "IPv6 ESP input: "
- "unspecified encryption algorithm for spi %u\n",
- (u_int32_t)ntohl(spi)));
- ipsec6stat.in_badspi++;
+ "unsupported encryption algorithm for spi %u (0x%08x)\n",
+ (u_int32_t)ntohl(spi), (u_int32_t)ntohl(spi)));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_badspi);
goto bad;
}
- algo = &esp_algorithms[sav->alg_enc]; /*XXX*/
-
/* check if we have proper ivlen information */
ivlen = sav->ivlen;
if (ivlen < 0) {
ipseclog((LOG_ERR, "inproper ivlen in IPv6 ESP input: %s %s\n",
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
- ipsec6stat.in_badspi++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_badspi);
goto bad;
}
- if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
- && (sav->alg_auth && sav->key_auth)))
+ seq = ntohl(((struct newesp *)esp)->esp_seq);
+
+ if ((sav->flags2 & SADB_X_EXT_SA2_SEQ_PER_TRAFFIC_CLASS) ==
+ SADB_X_EXT_SA2_SEQ_PER_TRAFFIC_CLASS) {
+ u_int8_t dscp = (ntohl(ip6->ip6_flow) & IP6FLOW_DSCP_MASK) >> IP6FLOW_DSCP_SHIFT;
+ traffic_class = rfc4594_dscp_to_tc(dscp);
+ }
+
+ /* Save ICV from packet for verification later */
+ size_t siz = 0;
+ unsigned char saved_icv[AH_MAXSUMSIZE];
+ if (algo->finalizedecrypt) {
+ siz = algo->icvlen;
+ VERIFY(siz <= UINT16_MAX);
+ m_copydata(m, m->m_pkthdr.len - (int)siz, (int)siz, (caddr_t) saved_icv);
+ goto delay_icv;
+ }
+
+ if (!((sav->flags & SADB_X_EXT_OLD) == 0 &&
+ sav->replay[traffic_class] != NULL &&
+ (sav->alg_auth && sav->key_auth))) {
goto noreplaycheck;
+ }
- if (sav->alg_auth == SADB_AALG_NULL)
+ if (sav->alg_auth == SADB_X_AALG_NULL ||
+ sav->alg_auth == SADB_AALG_NONE) {
goto noreplaycheck;
+ }
/*
* check for sequence number.
*/
- if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav))
+ if (ipsec_chkreplay(seq, sav, (u_int8_t)traffic_class)) {
; /*okey*/
- else {
- ipsec6stat.in_espreplay++;
+ } else {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_espreplay);
ipseclog((LOG_WARNING,
"replay packet in IPv6 ESP input: %s %s\n",
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
}
/* check ICV */
- {
- u_char sum0[AH_MAXSUMSIZE];
- u_char sum[AH_MAXSUMSIZE];
- struct ah_algorithm *sumalgo;
- size_t siz;
-
- sumalgo = &ah_algorithms[sav->alg_auth];
- siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
- if (AH_MAXSUMSIZE < siz) {
- ipseclog((LOG_DEBUG,
- "internal error: AH_MAXSUMSIZE must be larger than %lu\n",
- (u_long)siz));
- ipsec6stat.in_inval++;
- goto bad;
- }
+ {
+ u_char sum0[AH_MAXSUMSIZE] __attribute__((aligned(4)));
+ u_char sum[AH_MAXSUMSIZE] __attribute__((aligned(4)));
+ const struct ah_algorithm *sumalgo;
+
+ sumalgo = ah_algorithm_lookup(sav->alg_auth);
+ if (!sumalgo) {
+ goto noreplaycheck;
+ }
+ siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
+ if (m->m_pkthdr.len < off + ESPMAXLEN + siz) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+ if (AH_MAXSUMSIZE < siz) {
+ ipseclog((LOG_DEBUG,
+ "internal error: AH_MAXSUMSIZE must be larger than %u\n",
+ (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 - (int)siz, (int)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",
- ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
- ipsec6stat.in_espauthfail++;
- goto bad;
- }
+ 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",
+ ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_espauthfail);
+ goto bad;
+ }
- if (bcmp(sum0, sum, siz) != 0) {
- ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n",
- ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
- ipsec6stat.in_espauthfail++;
- goto bad;
- }
+ if (cc_cmp_safe(siz, sum0, sum)) {
+ ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n",
+ ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_espauthfail);
+ goto bad;
+ }
- /* strip off the authentication data */
- m_adj(m, -siz);
- ip6 = mtod(m, struct ip6_hdr *);
- ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - siz);
+delay_icv:
- m->m_flags |= M_AUTHIPDGM;
- ipsec6stat.in_espauthsucc++;
- }
+ /* strip off the authentication data */
+ m_adj(m, (int)-siz);
+ ip6 = mtod(m, struct ip6_hdr *);
+ ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - (u_int16_t)siz);
+
+ m->m_flags |= M_AUTHIPDGM;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_espauthsucc);
+ }
/*
* update sequence number.
*/
- if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
- if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) {
- ipsec6stat.in_espreplay++;
+ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay[traffic_class] != NULL) {
+ if (ipsec_updatereplay(seq, sav, (u_int8_t)traffic_class)) {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_espreplay);
goto bad;
}
}
esplen = sizeof(struct esp);
} else {
/* RFC 2406 */
- if (sav->flags & SADB_X_EXT_DERIV)
+ if (sav->flags & SADB_X_EXT_DERIV) {
esplen = sizeof(struct esp);
- else
+ } else {
esplen = sizeof(struct newesp);
+ }
}
if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) {
ipseclog((LOG_WARNING,
"IPv6 ESP input: packet too short\n"));
- ipsec6stat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto bad;
}
#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, off, esplen + ivlen, IPPROTO_DONE); /*XXX*/
+ IP6_EXTHDR_CHECK(m, off, (int)(esplen + ivlen), return IPPROTO_DONE); /*XXX*/
#else
IP6_EXTHDR_GET(esp, struct esp *, m, off, esplen + ivlen);
if (esp == NULL) {
- ipsec6stat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
m = NULL;
goto bad;
}
#endif
- ip6 = mtod(m, struct ip6_hdr *); /*set it again just in case*/
+ ip6 = mtod(m, struct ip6_hdr *); /*set it again just in case*/
+
+ /*
+ * pre-compute and cache intermediate key
+ */
+ if (esp_schedule(algo, sav) != 0) {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
+ goto bad;
+ }
/*
* decrypt the packet.
*/
- if (!algo->decrypt)
+ if (!algo->decrypt) {
panic("internal error: no decrypt function");
+ }
if ((*algo->decrypt)(m, off, sav, algo, ivlen)) {
- ipseclog((LOG_ERR, "decrypt fail in IPv6 ESP input: %s %s\n",
- ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
- ipsec6stat.in_inval++;
+ /* m is already freed */
+ m = NULL;
+ ipseclog((LOG_ERR, "decrypt fail in IPv6 ESP input: %s\n",
+ ipsec_logsastr(sav)));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto bad;
}
- ipsec6stat.in_esphist[sav->alg_enc]++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_esphist[sav->alg_enc]);
m->m_flags |= M_DECRYPTED;
+ if (algo->finalizedecrypt) {
+ if ((*algo->finalizedecrypt)(sav, saved_icv, algo->icvlen)) {
+ ipseclog((LOG_ERR, "esp6 packet decryption ICV failure\n"));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ KERNEL_DEBUG(DBG_FNC_DECRYPT | DBG_FUNC_END, 1, 0, 0, 0, 0);
+ goto bad;
+ }
+ }
+
/*
* find the trailer of the ESP.
*/
m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail),
- (caddr_t)&esptail);
+ (caddr_t)&esptail);
nxt = esptail.esp_nxt;
taillen = esptail.esp_padlen + sizeof(esptail);
if (m->m_pkthdr.len < taillen
- || m->m_pkthdr.len - taillen < sizeof(struct ip6_hdr)) { /*?*/
+ || m->m_pkthdr.len - taillen < sizeof(struct ip6_hdr)) { /*?*/
ipseclog((LOG_WARNING,
"bad pad length in IPv6 ESP input: %s %s\n",
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
- ipsec6stat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto bad;
}
/* strip off the trailing pad area. */
m_adj(m, -taillen);
-
+ ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - taillen);
+ if (*nproto == 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,
+ "IPv6 ESP input: invalid udp encapsulated ESP packet length\n"));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
+ goto bad;
+ }
+ ip6 = mtod(m, struct ip6_hdr *);
+ }
+
+ // 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[traffic_class] &&
+ seq >= sav->replay[traffic_class]->lastseq) {
+ struct udphdr *encap_uh = (__typeof__(encap_uh))(void *)((caddr_t)ip6 + off);
+ if (encap_uh->uh_sport &&
+ ntohs(encap_uh->uh_sport) != sav->remote_ike_port) {
+ sav->remote_ike_port = ntohs(encap_uh->uh_sport);
+ }
+ }
+ ip6 = esp6_input_strip_udp_encap(m, off);
+ esp = (struct esp *)(void *)(((u_int8_t *)ip6) + off);
+ }
+
+
/* was it transmitted over the IPsec tunnel SA? */
- if (ipsec6_tunnel_validate(ip6, nxt, sav)) {
+ if (ipsec6_tunnel_validate(m, (int)(off + esplen + ivlen), nxt, sav, &ifamily)) {
+ ifaddr_t ifa;
+ struct sockaddr_storage addr;
+
/*
* strip off all the headers that precedes ESP header.
* IP6 xx ESP IP6' payload -> IP6' payload
* XXX more sanity checks
* XXX relationship with gif?
*/
- u_int32_t flowinfo; /*net endian*/
+ u_int32_t flowinfo; /*net endian*/
flowinfo = ip6->ip6_flow;
- m_adj(m, off + esplen + ivlen);
- if (m->m_len < sizeof(*ip6)) {
+ m_adj(m, (int)(off + esplen + ivlen));
+ if (ifamily == AF_INET6) {
+ struct sockaddr_in6 *ip6addr;
+
+ if (m->m_len < sizeof(*ip6)) {
#ifndef PULLDOWN_TEST
- /*
- * m_pullup is prohibited in KAME IPv6 input processing
- * but there's no other way!
- */
+ /*
+ * m_pullup is prohibited in KAME IPv6 input processing
+ * but there's no other way!
+ */
#else
- /* okay to pullup in m_pulldown style */
+ /* okay to pullup in m_pulldown style */
#endif
- m = m_pullup(m, sizeof(*ip6));
- if (!m) {
- ipsec6stat.in_inval++;
+ m = m_pullup(m, sizeof(*ip6));
+ if (!m) {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
+ goto bad;
+ }
+ }
+ ip6 = mtod(m, struct ip6_hdr *);
+ /* ECN consideration. */
+ if (ip6_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip6->ip6_flow) == 0) {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto bad;
}
- }
- ip6 = mtod(m, struct ip6_hdr *);
- /* ECN consideration. */
- ip6_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip6->ip6_flow);
- if (!key_checktunnelsanity(sav, AF_INET6,
+ if (!key_checktunnelsanity(sav, AF_INET6,
(caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst)) {
- ipseclog((LOG_ERR, "ipsec tunnel address mismatch "
- "in IPv6 ESP input: %s %s\n",
- ipsec6_logpacketstr(ip6, spi),
- ipsec_logsastr(sav)));
- ipsec6stat.in_inval++;
- goto bad;
+ ipseclog((LOG_ERR, "ipsec tunnel address mismatch "
+ "in IPv6 ESP input: %s %s\n",
+ ipsec6_logpacketstr(ip6, spi),
+ ipsec_logsastr(sav)));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
+ goto bad;
+ }
+
+ bzero(&addr, sizeof(addr));
+ ip6addr = (__typeof__(ip6addr)) & addr;
+ ip6addr->sin6_family = AF_INET6;
+ ip6addr->sin6_len = sizeof(*ip6addr);
+ ip6addr->sin6_addr = ip6->ip6_dst;
+ } else 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;
+ }
+ }
+
+ u_int8_t otos;
+ int sum;
+
+ ip = mtod(m, struct ip *);
+ otos = ip->ip_tos;
+ /* ECN consideration. */
+ if (ip46_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip->ip_tos) == 0) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+
+ if (otos != 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);
+ }
+
+ if (!key_checktunnelsanity(sav, AF_INET,
+ (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst)) {
+ ipseclog((LOG_ERR, "ipsec tunnel address mismatch "
+ "in ESP input: %s %s\n",
+ ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto bad;
+ }
+
+ 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 0 /* XXX should call ipfw rather than ipsec_in_reject, shouldn't it ? */
- /* drop it if it does not match the default policy */
- if (ipsec6_in_reject(m, NULL)) {
- ipsec6stat.in_polvio++;
+ key_sa_recordxfer(sav, m);
+ if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 ||
+ ipsec_addhist(m, IPPROTO_IPV6, 0) != 0) {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_nomem);
goto bad;
}
-#endif
- key_sa_recordxfer(sav, m);
+ // 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);
+ }
+
+ // Input via IPsec interface
+ lck_mtx_lock(sadb_mutex);
+ ifnet_t ipsec_if = sav->sah->ipsec_if;
+ if (ipsec_if != NULL) {
+ // If an interface is found, add a reference count before dropping the lock
+ ifnet_reference(ipsec_if);
+ }
+ lck_mtx_unlock(sadb_mutex);
+ if (ipsec_if != NULL) {
+ esp_input_log(m, sav, spi, seq);
+ ipsec_save_wake_packet(m, ntohl(spi), seq);
+
+ // Return mbuf
+ if (interface != NULL &&
+ interface == ipsec_if) {
+ ifnet_release(ipsec_if);
+ goto done;
+ }
+
+ errno_t inject_error = ipsec_inject_inbound_packet(ipsec_if, m);
+ ifnet_release(ipsec_if);
- s = splimp();
- if (IF_QFULL(&ip6intrq)) {
- ipsec6stat.in_inval++;
+ if (inject_error == 0) {
+ m = NULL;
+ nxt = IPPROTO_DONE;
+ goto done;
+ } else {
+ goto bad;
+ }
+ }
+
+ if (proto_input(ifamily == AF_INET ? PF_INET : PF_INET6, m) != 0) {
goto bad;
}
- IF_ENQUEUE(&ip6intrq, m);
- m = NULL;
- schednetisr(NETISR_IPV6); /*can be skipped but to make sure*/
- splx(s);
nxt = IPPROTO_DONE;
} else {
/*
* even in m_pulldown case, we need to strip off ESP so that
* we can always compute checksum for AH correctly.
*/
- size_t stripsiz;
+ u_int16_t stripsiz;
char *prvnxtp;
/*
* Set the next header field of the previous header correctly.
*/
prvnxtp = ip6_get_prevhdr(m, off); /* XXX */
- *prvnxtp = nxt;
+ *prvnxtp = (u_int8_t)nxt;
- stripsiz = esplen + ivlen;
+ VERIFY(esplen + ivlen <= UINT16_MAX);
+ stripsiz = (u_int16_t)(esplen + ivlen);
ip6 = mtod(m, struct ip6_hdr *);
if (m->m_len >= stripsiz + off) {
goto bad;
}
m_adj(n, stripsiz);
- m_cat(m, n);
/* m_cat does not update m_pkthdr.len */
m->m_pkthdr.len += n->m_pkthdr.len;
+ m_cat(m, n);
}
+#ifndef PULLDOWN_TEST
+ /*
+ * KAME requires that the packet to be contiguous on the
+ * mbuf. We need to make that sure.
+ * this kind of code should be avoided.
+ * XXX other conditions to avoid running this part?
+ */
+ if (m->m_len != m->m_pkthdr.len) {
+ struct mbuf *n = NULL;
+ int maxlen;
+
+ MGETHDR(n, M_DONTWAIT, MT_HEADER); /* MAC-OK */
+ maxlen = MHLEN;
+ if (n) {
+ M_COPY_PKTHDR(n, m);
+ }
+ if (n && m->m_pkthdr.len > maxlen) {
+ MCLGET(n, M_DONTWAIT);
+ maxlen = MCLBYTES;
+ if ((n->m_flags & M_EXT) == 0) {
+ m_free(n);
+ n = NULL;
+ }
+ }
+ if (!n) {
+ printf("esp6_input: mbuf allocation failed\n");
+ goto bad;
+ }
+
+ if (m->m_pkthdr.len <= maxlen) {
+ m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
+ n->m_len = m->m_pkthdr.len;
+ n->m_pkthdr.len = m->m_pkthdr.len;
+ n->m_next = NULL;
+ m_freem(m);
+ } else {
+ m_copydata(m, 0, maxlen, mtod(n, caddr_t));
+ n->m_len = maxlen;
+ n->m_pkthdr.len = m->m_pkthdr.len;
+ n->m_next = m;
+ m_adj(m, maxlen);
+ m->m_flags &= ~M_PKTHDR;
+ }
+ m = n;
+ }
+#endif
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz);
key_sa_recordxfer(sav, m);
+ if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_nomem);
+ goto bad;
+ }
+
+ /*
+ * Set the csum valid flag, if we authenticated the
+ * packet, the payload shouldn't be corrupt unless
+ * it was corrupted before being signed on the other
+ * side.
+ */
+ if (nxt == IPPROTO_TCP || nxt == IPPROTO_UDP) {
+ m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
+ m->m_pkthdr.csum_data = 0xFFFF;
+ _CASSERT(offsetof(struct pkthdr, csum_data) == offsetof(struct pkthdr, csum_rx_val));
+ }
+
+ // Input via IPsec interface
+ lck_mtx_lock(sadb_mutex);
+ ifnet_t ipsec_if = sav->sah->ipsec_if;
+ if (ipsec_if != NULL) {
+ // If an interface is found, add a reference count before dropping the lock
+ ifnet_reference(ipsec_if);
+ }
+ lck_mtx_unlock(sadb_mutex);
+ if (ipsec_if != NULL) {
+ esp_input_log(m, sav, spi, seq);
+ ipsec_save_wake_packet(m, ntohl(spi), seq);
+
+ // Return mbuf
+ if (interface != NULL &&
+ interface == ipsec_if) {
+ ifnet_release(ipsec_if);
+ goto done;
+ }
+
+ errno_t inject_error = ipsec_inject_inbound_packet(ipsec_if, m);
+ ifnet_release(ipsec_if);
+
+ if (inject_error == 0) {
+ m = NULL;
+ nxt = IPPROTO_DONE;
+ goto done;
+ } else {
+ goto bad;
+ }
+ }
}
+done:
*offp = off;
*mp = m;
-
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP esp6_input call free SA:%p\n", sav));
- key_freesav(sav);
+ printf("DP esp6_input call free SA:0x%llx\n",
+ (uint64_t)VM_KERNEL_ADDRPERM(sav)));
+ key_freesav(sav, KEY_SADB_UNLOCKED);
}
- ipsec6stat.in_success++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_success);
return nxt;
bad:
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP esp6_input call free SA:%p\n", sav));
- key_freesav(sav);
+ printf("DP esp6_input call free SA:0x%llx\n",
+ (uint64_t)VM_KERNEL_ADDRPERM(sav)));
+ key_freesav(sav, KEY_SADB_UNLOCKED);
}
- if (m)
+ if (m) {
m_freem(m);
+ }
+ if (interface != NULL) {
+ *mp = NULL;
+ }
return IPPROTO_DONE;
}
-#endif /* INET6 */
+
+void
+esp6_ctlinput(int cmd, struct sockaddr *sa, void *d, __unused struct ifnet *ifp)
+{
+ const struct newesp *espp;
+ struct newesp esp;
+ struct ip6ctlparam *ip6cp = NULL, ip6cp1;
+ struct secasvar *sav;
+ struct ip6_hdr *ip6;
+ struct mbuf *m;
+ int off = 0;
+ struct sockaddr_in6 *sa6_src, *sa6_dst;
+
+ if (sa->sa_family != AF_INET6 ||
+ sa->sa_len != sizeof(struct sockaddr_in6)) {
+ return;
+ }
+ if ((unsigned)cmd >= PRC_NCMDS) {
+ return;
+ }
+
+ /* if the parameter is from icmp6, decode it. */
+ if (d != NULL) {
+ ip6cp = (struct ip6ctlparam *)d;
+ m = ip6cp->ip6c_m;
+ ip6 = ip6cp->ip6c_ip6;
+ off = ip6cp->ip6c_off;
+ } else {
+ m = NULL;
+ ip6 = NULL;
+ }
+
+ if (ip6) {
+ /*
+ * Notify the error to all possible sockets via pfctlinput2.
+ * Since the upper layer information (such as protocol type,
+ * source and destination ports) is embedded in the encrypted
+ * data and might have been cut, we can't directly call
+ * an upper layer ctlinput function. However, the pcbnotify
+ * function will consider source and destination addresses
+ * as well as the flow info value, and may be able to find
+ * some PCB that should be notified.
+ * Although pfctlinput2 will call esp6_ctlinput(), there is
+ * no possibility of an infinite loop of function calls,
+ * because we don't pass the inner IPv6 header.
+ */
+ bzero(&ip6cp1, sizeof(ip6cp1));
+ ip6cp1.ip6c_src = ip6cp->ip6c_src;
+ pfctlinput2(cmd, sa, (void *)&ip6cp1);
+
+ /*
+ * Then go to special cases that need ESP header information.
+ * XXX: We assume that when ip6 is non NULL,
+ * M and OFF are valid.
+ */
+
+ /* check if we can safely examine src and dst ports */
+ if (m->m_pkthdr.len < off + sizeof(esp)) {
+ return;
+ }
+
+ if (m->m_len < off + sizeof(esp)) {
+ /*
+ * this should be rare case,
+ * so we compromise on this copy...
+ */
+ m_copydata(m, off, sizeof(esp), (caddr_t)&esp);
+ espp = &esp;
+ } else {
+ espp = (struct newesp*)(void *)(mtod(m, caddr_t) + off);
+ }
+
+ if (cmd == PRC_MSGSIZE) {
+ int valid = 0;
+
+ /*
+ * Check to see if we have a valid SA corresponding to
+ * the address in the ICMP message payload.
+ */
+ sa6_src = ip6cp->ip6c_src;
+ sa6_dst = (struct sockaddr_in6 *)(void *)sa;
+ sav = key_allocsa(AF_INET6,
+ (caddr_t)&sa6_src->sin6_addr,
+ (caddr_t)&sa6_dst->sin6_addr,
+ IPPROTO_ESP, espp->esp_spi);
+ if (sav) {
+ if (sav->state == SADB_SASTATE_MATURE ||
+ sav->state == SADB_SASTATE_DYING) {
+ valid++;
+ }
+ key_freesav(sav, KEY_SADB_UNLOCKED);
+ }
+
+ /* XXX Further validation? */
+
+ /*
+ * Depending on the value of "valid" and routing table
+ * size (mtudisc_{hi,lo}wat), we will:
+ * - recalcurate the new MTU and create the
+ * corresponding routing entry, or
+ * - ignore the MTU change notification.
+ */
+ icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
+ }
+ } else {
+ /* we normally notify any pcb here */
+ }
+}
projects / apple / xnu.git / blobdiff