+/*
+ * 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/ah_input.c,v 1.1.2.6 2002/04/28 05:40:26 suz Exp $ */
+/* $KAME: ah_input.c,v 1.67 2002/01/07 11:39:56 kjc Exp $ */
+
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
* RFC1826/2402 authentication header.
*/
-#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.h>
#include <netinet/ip_var.h>
#include <netinet/ip_ecn.h>
+#include <netinet/in_pcb.h>
+#if INET6
+#include <netinet6/ip6_ecn.h>
+#endif
#if INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
+#include <netinet6/in6_pcb.h>
#include <netinet/icmp6.h>
+#include <netinet6/ip6protosw.h>
#endif
#include <netinet6/ipsec.h>
+#if INET6
+#include <netinet6/ipsec6.h>
+#endif
#include <netinet6/ah.h>
+#if INET6
+#include <netinet6/ah6.h>
+#endif
#include <netkey/key.h>
#include <netkey/keydb.h>
+#if IPSEC_DEBUG
#include <netkey/key_debug.h>
+#else
+#define KEYDEBUG(lev, arg)
+#endif
+#include <net/kpi_protocol.h>
+#include <netinet/kpi_ipfilter_var.h>
+#include <mach/sdt.h>
#include <net/net_osdep.h>
#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;
+#if INET
void
ah4_input(struct mbuf *m, int off)
{
struct ip *ip;
struct ah *ah;
u_int32_t spi;
- struct ah_algorithm *algo;
+ const struct ah_algorithm *algo;
size_t siz;
size_t siz1;
u_char *cksum;
struct secasvar *sav = NULL;
u_int16_t nxt;
size_t hlen;
- int s;
+ size_t stripsiz = 0;
+ sa_family_t ifamily;
-#ifndef PULLDOWN_TEST
if (m->m_len < off + sizeof(struct newah)) {
m = m_pullup(m, off + sizeof(struct newah));
if (!m) {
ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup;"
- "dropping the packet for simplicity\n"));
- ipsecstat.in_inval++;
+ "dropping the packet for simplicity\n"));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto fail;
}
}
+ /* Expect 32-bit aligned data pointer on strict-align platforms */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
+
ip = mtod(m, struct ip *);
- ah = (struct ah *)(((caddr_t)ip) + off);
-#else
- ip = mtod(m, struct ip *);
- IP6_EXTHDR_GET(ah, struct ah *, m, off, sizeof(struct newah));
- if (ah == NULL) {
- ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup;"
- "dropping the packet for simplicity\n"));
- ipsecstat.in_inval++;
- goto fail;
- }
-#endif
+ ah = (struct ah *)(void *)(((caddr_t)ip) + off);
nxt = ah->ah_nxt;
#ifdef _IP_VHL
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
spi = ah->ah_spi;
if ((sav = key_allocsa(AF_INET,
- (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst,
- IPPROTO_AH, spi)) == 0) {
+ (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst,
+ IPPROTO_AH, spi)) == 0) {
ipseclog((LOG_WARNING,
"IPv4 AH input: no key association found for spi %u\n",
(u_int32_t)ntohl(spi)));
- ipsecstat.in_nosa++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_nosa);
goto fail;
}
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP ah4_input called to allocate SA:%p\n", sav));
+ printf("DP ah4_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 AH input: non-mature/dying SA found for spi %u\n",
(u_int32_t)ntohl(spi)));
- ipsecstat.in_badspi++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_badspi);
goto fail;
}
- if (sav->alg_auth == SADB_AALG_NONE) {
+
+ algo = ah_algorithm_lookup(sav->alg_auth);
+ if (!algo) {
ipseclog((LOG_DEBUG, "IPv4 AH input: "
- "unspecified authentication algorithm for spi %u\n",
+ "unsupported authentication algorithm for spi %u\n",
(u_int32_t)ntohl(spi)));
- ipsecstat.in_badspi++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_badspi);
goto fail;
}
- algo = &ah_algorithms[sav->alg_auth];
-
siz = (*algo->sumsiz)(sav);
siz1 = ((siz + 3) & ~(4 - 1));
/*
* sanity checks for header, 1.
*/
- {
- int sizoff;
-
- sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4;
+ {
+ int sizoff;
- if ((ah->ah_len << 2) - sizoff != siz1) {
- ipseclog((LOG_NOTICE, "sum length mismatch in IPv4 AH input "
- "(%d should be %u): %s\n",
- (ah->ah_len << 2) - sizoff, (unsigned int)siz1,
- ipsec4_logpacketstr(ip, spi)));
- ipsecstat.in_inval++;
- goto fail;
- }
+ sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4;
-#ifndef PULLDOWN_TEST
- if (m->m_len < off + sizeof(struct ah) + sizoff + siz1) {
- m = m_pullup(m, off + sizeof(struct ah) + sizoff + siz1);
- if (!m) {
- ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup\n"));
- ipsecstat.in_inval++;
+ /*
+ * Here, we do not do "siz1 == siz". This is because the way
+ * RFC240[34] section 2 is written. They do not require truncation
+ * to 96 bits.
+ * For example, Microsoft IPsec stack attaches 160 bits of
+ * authentication data for both hmac-md5 and hmac-sha1. For hmac-sha1,
+ * 32 bits of padding is attached.
+ *
+ * There are two downsides to this specification.
+ * They have no real harm, however, they leave us fuzzy feeling.
+ * - if we attach more than 96 bits of authentication data onto AH,
+ * we will never notice about possible modification by rogue
+ * intermediate nodes.
+ * Since extra bits in AH checksum is never used, this constitutes
+ * no real issue, however, it is wacky.
+ * - even if the peer attaches big authentication data, we will never
+ * notice the difference, since longer authentication data will just
+ * work.
+ *
+ * We may need some clarification in the spec.
+ */
+ if (siz1 < siz) {
+ ipseclog((LOG_NOTICE, "sum length too short in IPv4 AH input "
+ "(%lu, should be at least %lu): %s\n",
+ (u_int32_t)siz1, (u_int32_t)siz,
+ ipsec4_logpacketstr(ip, spi)));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto fail;
+ }
+ if ((ah->ah_len << 2) - sizoff != siz1) {
+ ipseclog((LOG_NOTICE, "sum length mismatch in IPv4 AH input "
+ "(%d should be %lu): %s\n",
+ (ah->ah_len << 2) - sizoff, (u_int32_t)siz1,
+ ipsec4_logpacketstr(ip, spi)));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto fail;
}
- ip = mtod(m, struct ip *);
- ah = (struct ah *)(((caddr_t)ip) + off);
- }
-#else
- IP6_EXTHDR_GET(ah, struct ah *, m, off,
- sizeof(struct ah) + sizoff + siz1);
- if (ah == NULL) {
- ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup\n"));
- ipsecstat.in_inval++;
- goto fail;
+ if (m->m_len < off + sizeof(struct ah) + sizoff + siz1) {
+ m = m_pullup(m, off + sizeof(struct ah) + sizoff + siz1);
+ if (!m) {
+ ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup\n"));
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto fail;
+ }
+ /* Expect 32-bit aligned data ptr on strict-align platforms */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
+
+ ip = mtod(m, struct ip *);
+ ah = (struct ah *)(void *)(((caddr_t)ip) + off);
+ }
}
-#endif
- }
/*
* check for sequence number.
*/
- if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
- if (ipsec_chkreplay(ntohl(((struct newah *)ah)->ah_seq), sav))
+ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay[0] != NULL) {
+ if (ipsec_chkreplay(ntohl(((struct newah *)ah)->ah_seq), sav, 0)) {
; /*okey*/
- else {
- ipsecstat.in_ahreplay++;
+ } else {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_ahreplay);
ipseclog((LOG_WARNING,
"replay packet in IPv4 AH input: %s %s\n",
ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
if (!cksum) {
ipseclog((LOG_DEBUG, "IPv4 AH input: "
"couldn't alloc temporary region for cksum\n"));
- ipsecstat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto fail;
}
-
- {
-#if 1
+
/*
* some of IP header fields are flipped to the host endian.
* convert them back to network endian. VERY stupid.
*/
-#ifndef __NetBSD__
ip->ip_len = htons(ip->ip_len + hlen);
- ip->ip_id = htons(ip->ip_id);
-#else
- ip->ip_len = htons(ip->ip_len);
-#endif
ip->ip_off = htons(ip->ip_off);
-#endif
- if (ah4_calccksum(m, (caddr_t)cksum, algo, sav)) {
- _FREE(cksum, M_TEMP);
- ipsecstat.in_inval++;
+ if (ah4_calccksum(m, (caddr_t)cksum, siz1, algo, sav)) {
+ FREE(cksum, M_TEMP);
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto fail;
}
- ipsecstat.in_ahhist[sav->alg_auth]++;
-#if 1
+ IPSEC_STAT_INCREMENT(ipsecstat.in_ahhist[sav->alg_auth]);
/*
* flip them back.
*/
-#ifndef __NetBSD__
ip->ip_len = ntohs(ip->ip_len) - hlen;
- ip->ip_id = ntohs(ip->ip_id);
-#else
- ip->ip_len = ntohs(ip->ip_len);
-#endif
ip->ip_off = ntohs(ip->ip_off);
-#endif
- }
- {
- caddr_t sumpos = NULL;
+ {
+ caddr_t sumpos = NULL;
- if (sav->flags & SADB_X_EXT_OLD) {
- /* RFC 1826 */
- sumpos = (caddr_t)(ah + 1);
- } else {
- /* RFC 2402 */
- sumpos = (caddr_t)(((struct newah *)ah) + 1);
- }
+ if (sav->flags & SADB_X_EXT_OLD) {
+ /* RFC 1826 */
+ sumpos = (caddr_t)(ah + 1);
+ } else {
+ /* RFC 2402 */
+ sumpos = (caddr_t)(((struct newah *)ah) + 1);
+ }
- if (bcmp(sumpos, cksum, siz) != 0) {
- ipseclog((LOG_WARNING,
- "checksum mismatch in IPv4 AH input: %s %s\n",
- ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
- _FREE(cksum, M_TEMP);
- ipsecstat.in_ahauthfail++;
- goto fail;
+ if (bcmp(sumpos, cksum, siz) != 0) {
+ ipseclog((LOG_WARNING,
+ "checksum mismatch in IPv4 AH input: %s %s\n",
+ ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
+ FREE(cksum, M_TEMP);
+ IPSEC_STAT_INCREMENT(ipsecstat.in_ahauthfail);
+ goto fail;
+ }
}
- }
- _FREE(cksum, M_TEMP);
+ FREE(cksum, M_TEMP);
m->m_flags |= M_AUTHIPHDR;
m->m_flags |= M_AUTHIPDGM;
if (m->m_len < off + sizeof(struct ah) + sizoff + siz1 + hlen) {
m = m_pullup(m, off + sizeof(struct ah)
- + sizoff + siz1 + hlen);
+ + sizoff + siz1 + hlen);
if (!m) {
ipseclog((LOG_DEBUG,
"IPv4 AH input: can't pullup\n"));
- ipsecstat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto fail;
}
}
nip = (struct ip *)((u_char *)(ah + 1) + sizoff + siz1);
if (nip->ip_src.s_addr != ip->ip_src.s_addr
- || nip->ip_dst.s_addr != ip->ip_dst.s_addr) {
+ || nip->ip_dst.s_addr != ip->ip_dst.s_addr) {
m->m_flags &= ~M_AUTHIPHDR;
m->m_flags &= ~M_AUTHIPDGM;
}
#endif /*0*/
if (m->m_flags & M_AUTHIPHDR
- && m->m_flags & M_AUTHIPDGM) {
+ && m->m_flags & M_AUTHIPDGM) {
#if 0
ipseclog((LOG_DEBUG,
"IPv4 AH input: authentication succeess\n"));
#endif
- ipsecstat.in_ahauthsucc++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_ahauthsucc);
} else {
ipseclog((LOG_WARNING,
"authentication failed in IPv4 AH input: %s %s\n",
ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
- ipsecstat.in_ahauthfail++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_ahauthfail);
goto fail;
}
/*
* update sequence number.
*/
- if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
- if (ipsec_updatereplay(ntohl(((struct newah *)ah)->ah_seq), sav)) {
- ipsecstat.in_ahreplay++;
+ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay[0] != NULL) {
+ if (ipsec_updatereplay(ntohl(((struct newah *)ah)->ah_seq), sav, 0)) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_ahreplay);
goto fail;
}
}
/* was it transmitted over the IPsec tunnel SA? */
- if (ipsec4_tunnel_validate(ip, nxt, sav) && nxt == IPPROTO_IPV4) {
+ if (sav->flags & SADB_X_EXT_OLD) {
+ /* RFC 1826 */
+ stripsiz = sizeof(struct ah) + siz1;
+ } else {
+ /* RFC 2402 */
+ stripsiz = sizeof(struct newah) + siz1;
+ }
+ if (ipsec4_tunnel_validate(m, off + stripsiz, nxt, sav, &ifamily)) {
+ ifaddr_t ifa;
+ struct sockaddr_storage addr;
+ struct sockaddr_in *ipaddr;
+
/*
* strip off all the headers that precedes AH.
* IP xx AH IP' payload -> IP' payload
* XXX more sanity checks
* XXX relationship with gif?
*/
- size_t stripsiz = 0;
- u_int8_t tos;
+ u_int8_t tos, otos;
+ int sum;
- tos = ip->ip_tos;
- if (sav->flags & SADB_X_EXT_OLD) {
- /* RFC 1826 */
- stripsiz = sizeof(struct ah) + siz1;
- } else {
- /* RFC 2402 */
- stripsiz = sizeof(struct newah) + siz1;
+ if (ifamily == AF_INET6) {
+ ipseclog((LOG_NOTICE, "ipsec tunnel protocol mismatch "
+ "in IPv4 AH input: %s\n", ipsec_logsastr(sav)));
+ goto fail;
}
+ tos = ip->ip_tos;
m_adj(m, off + stripsiz);
if (m->m_len < sizeof(*ip)) {
m = m_pullup(m, sizeof(*ip));
if (!m) {
- ipsecstat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto fail;
}
}
ip = mtod(m, struct ip *);
+ otos = ip->ip_tos;
/* ECN consideration. */
- ip_ecn_egress(ip4_ipsec_ecn, &tos, &ip->ip_tos);
+ if (ip_ecn_egress(ip4_ipsec_ecn, &tos, &ip->ip_tos) == 0) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
+ goto fail;
+ }
+
+ 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)) {
+ (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst)) {
ipseclog((LOG_NOTICE, "ipsec tunnel address mismatch "
"in IPv4 AH input: %s %s\n",
ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
- ipsecstat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto fail;
}
-#if 0 /* XXX should we call ipfw rather than ipsec_in_reject? */
- /* drop it if it does not match the default policy */
- if (ipsec4_in_reject(m, NULL)) {
- ipsecstat.in_polvio++;
- goto fail;
- }
-#endif
-
#if 1
/*
* Should the inner packet be considered authentic?
#endif
key_sa_recordxfer(sav, m);
+ if (ipsec_addhist(m, IPPROTO_AH, spi) != 0 ||
+ ipsec_addhist(m, IPPROTO_IPV4, 0) != 0) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_nomem);
+ goto fail;
+ }
+
+ bzero(&addr, sizeof(addr));
+ ipaddr = (__typeof__(ipaddr)) & addr;
+ ipaddr->sin_family = AF_INET;
+ ipaddr->sin_len = sizeof(*ipaddr);
+ ipaddr->sin_addr = ip->ip_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);
+ }
- s = splimp();
- if (IF_QFULL(&ipintrq)) {
- ipsecstat.in_inval++;
+ // 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) {
+ 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 fail;
+ }
+ }
+
+ if (proto_input(PF_INET, m) != 0) {
goto fail;
}
- IF_ENQUEUE(&ipintrq, m);
- m = NULL;
- schednetisr(NETISR_IP); /*can be skipped but to make sure*/
- splx(s);
nxt = IPPROTO_DONE;
} else {
/*
* strip off AH.
- * We do deep-copy since KAME requires that
- * the packet is placed in a single external mbuf.
*/
- size_t stripsiz = 0;
-
- if (sav->flags & SADB_X_EXT_OLD) {
- /* RFC 1826 */
- stripsiz = sizeof(struct ah) + siz1;
- } else {
- /* RFC 2402 */
- stripsiz = sizeof(struct newah) + siz1;
- }
ip = mtod(m, struct ip *);
-#ifndef PULLDOWN_TEST
+ /*
+ * We do deep-copy since KAME requires that
+ * the packet is placed in a single external mbuf.
+ */
ovbcopy((caddr_t)ip, (caddr_t)(((u_char *)ip) + stripsiz), off);
m->m_data += stripsiz;
m->m_len -= stripsiz;
m->m_pkthdr.len -= stripsiz;
-#else
- /*
- * even in m_pulldown case, we need to strip off AH so that
- * we can compute checksum for multiple AH correctly.
- */
- if (m->m_len >= stripsiz + off) {
- ovbcopy((caddr_t)ip, ((caddr_t)ip) + stripsiz, off);
- m->m_data += stripsiz;
- m->m_len -= stripsiz;
- m->m_pkthdr.len -= stripsiz;
- } else {
- /*
- * this comes with no copy if the boundary is on
- * cluster
- */
- struct mbuf *n;
-
- n = m_split(m, off, M_DONTWAIT);
- if (n == NULL) {
- /* m is retained by m_split */
- goto fail;
- }
- m_adj(n, stripsiz);
- m_cat(m, n);
- /* m_cat does not update m_pkthdr.len */
- m->m_pkthdr.len += n->m_pkthdr.len;
- }
-#endif
if (m->m_len < sizeof(*ip)) {
m = m_pullup(m, sizeof(*ip));
if (m == NULL) {
- ipsecstat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_inval);
goto fail;
}
}
/* forget about IP hdr checksum, the check has already been passed */
key_sa_recordxfer(sav, m);
+ if (ipsec_addhist(m, IPPROTO_AH, spi) != 0) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_nomem);
+ goto fail;
+ }
+
+ 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);
+
+ if (nxt != IPPROTO_DONE) {
+ // 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) {
+ 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);
+ 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 fail;
+ }
+ }
- if (nxt != IPPROTO_DONE)
- (*ip_protox[nxt]->pr_input)(m, off);
- else
+ if ((ip_protox[nxt]->pr_flags & PR_LASTHDR) != 0 &&
+ ipsec4_in_reject(m, NULL)) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_polvio);
+ goto fail;
+ }
+ ip_proto_dispatch_in(m, off, nxt, 0);
+ } else {
m_freem(m);
+ }
m = NULL;
}
-
+done:
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP ah4_input call free SA:%p\n", sav));
- key_freesav(sav);
+ printf("DP ah4_input call free SA:0x%llx\n",
+ (uint64_t)VM_KERNEL_ADDRPERM(sav)));
+ key_freesav(sav, KEY_SADB_UNLOCKED);
}
- ipsecstat.in_success++;
+ IPSEC_STAT_INCREMENT(ipsecstat.in_success);
return;
fail:
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP ah4_input call free SA:%p\n", sav));
- key_freesav(sav);
+ printf("DP ah4_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;
}
#endif /* INET */
#if INET6
int
-ah6_input(mp, offp, proto)
- struct mbuf **mp;
- int *offp, proto;
+ah6_input(struct mbuf **mp, int *offp, int proto)
{
+#pragma unused(proto)
struct mbuf *m = *mp;
int off = *offp;
struct ip6_hdr *ip6;
struct ah *ah;
u_int32_t spi;
- struct ah_algorithm *algo;
+ const struct ah_algorithm *algo;
size_t siz;
size_t siz1;
u_char *cksum;
struct secasvar *sav = NULL;
u_int16_t nxt;
- int s;
+ size_t stripsiz = 0;
+ sa_family_t ifamily;
+
+ IP6_EXTHDR_CHECK(m, off, sizeof(struct ah), {return IPPROTO_DONE;});
+ ah = (struct ah *)(void *)(mtod(m, caddr_t) + off);
+ /* Expect 32-bit aligned data pointer on strict-align platforms */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, off, sizeof(struct ah), IPPROTO_DONE);
- ah = (struct ah *)(mtod(m, caddr_t) + off);
-#else
- IP6_EXTHDR_GET(ah, struct ah *, m, off, sizeof(struct newah));
- if (ah == NULL) {
- ipseclog((LOG_DEBUG, "IPv6 AH input: can't pullup\n"));
- ipsecstat.in_inval++;
- return IPPROTO_DONE;
- }
-#endif
ip6 = mtod(m, struct ip6_hdr *);
nxt = ah->ah_nxt;
if (ntohs(ip6->ip6_plen) == 0) {
ipseclog((LOG_ERR, "IPv6 AH input: "
"AH with IPv6 jumbogram is not supported.\n"));
- ipsec6stat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto fail;
}
if ((sav = key_allocsa(AF_INET6,
- (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst,
- IPPROTO_AH, spi)) == 0) {
+ (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst,
+ IPPROTO_AH, spi)) == 0) {
ipseclog((LOG_WARNING,
"IPv6 AH input: no key association found for spi %u\n",
(u_int32_t)ntohl(spi)));
- ipsec6stat.in_nosa++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_nosa);
goto fail;
}
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP ah6_input called to allocate SA:%p\n", sav));
+ printf("DP ah6_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 AH input: non-mature/dying SA found for spi %u; ",
(u_int32_t)ntohl(spi)));
- ipsec6stat.in_badspi++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_badspi);
goto fail;
}
- if (sav->alg_auth == SADB_AALG_NONE) {
+
+ algo = ah_algorithm_lookup(sav->alg_auth);
+ if (!algo) {
ipseclog((LOG_DEBUG, "IPv6 AH input: "
- "unspecified authentication algorithm for spi %u\n",
+ "unsupported authentication algorithm for spi %u\n",
(u_int32_t)ntohl(spi)));
- ipsec6stat.in_badspi++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_badspi);
goto fail;
}
- algo = &ah_algorithms[sav->alg_auth];
-
siz = (*algo->sumsiz)(sav);
siz1 = ((siz + 3) & ~(4 - 1));
/*
* sanity checks for header, 1.
*/
- {
- int sizoff;
+ {
+ int sizoff;
- sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4;
+ sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4;
- if ((ah->ah_len << 2) - sizoff != siz1) {
- ipseclog((LOG_NOTICE, "sum length mismatch in IPv6 AH input "
- "(%d should be %u): %s\n",
- (ah->ah_len << 2) - sizoff, (unsigned int)siz1,
- ipsec6_logpacketstr(ip6, spi)));
- ipsec6stat.in_inval++;
- goto fail;
- }
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, off, sizeof(struct ah) + sizoff + siz1, IPPROTO_DONE);
-#else
- IP6_EXTHDR_GET(ah, struct ah *, m, off,
- sizeof(struct ah) + sizoff + siz1);
- if (ah == NULL) {
- ipseclog((LOG_NOTICE, "couldn't pullup gather IPv6 AH checksum part"));
- ipsecstat.in_inval++;
- m = NULL;
- goto fail;
+ /*
+ * Here, we do not do "siz1 == siz". See ah4_input() for complete
+ * description.
+ */
+ if (siz1 < siz) {
+ ipseclog((LOG_NOTICE, "sum length too short in IPv6 AH input "
+ "(%lu, should be at least %lu): %s\n",
+ (u_int32_t)siz1, (u_int32_t)siz,
+ ipsec6_logpacketstr(ip6, spi)));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
+ goto fail;
+ }
+ if ((ah->ah_len << 2) - sizoff != siz1) {
+ ipseclog((LOG_NOTICE, "sum length mismatch in IPv6 AH input "
+ "(%d should be %lu): %s\n",
+ (ah->ah_len << 2) - sizoff, (u_int32_t)siz1,
+ ipsec6_logpacketstr(ip6, spi)));
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
+ goto fail;
+ }
+ IP6_EXTHDR_CHECK(m, off, sizeof(struct ah) + sizoff + siz1,
+ {return IPPROTO_DONE;});
}
-#endif
- }
/*
* check for sequence number.
*/
- if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
- if (ipsec_chkreplay(ntohl(((struct newah *)ah)->ah_seq), sav))
+ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay[0] != NULL) {
+ if (ipsec_chkreplay(ntohl(((struct newah *)ah)->ah_seq), sav, 0)) {
; /*okey*/
- else {
- ipsec6stat.in_ahreplay++;
+ } else {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_ahreplay);
ipseclog((LOG_WARNING,
"replay packet in IPv6 AH input: %s %s\n",
ipsec6_logpacketstr(ip6, spi),
if (!cksum) {
ipseclog((LOG_DEBUG, "IPv6 AH input: "
"couldn't alloc temporary region for cksum\n"));
- ipsec6stat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto fail;
}
-
- if (ah6_calccksum(m, (caddr_t)cksum, algo, sav)) {
- _FREE(cksum, M_TEMP);
- ipsec6stat.in_inval++;
+
+ if (ah6_calccksum(m, (caddr_t)cksum, siz1, algo, sav)) {
+ FREE(cksum, M_TEMP);
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto fail;
}
- ipsec6stat.in_ahhist[sav->alg_auth]++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_ahhist[sav->alg_auth]);
- {
- caddr_t sumpos = NULL;
+ {
+ caddr_t sumpos = NULL;
- if (sav->flags & SADB_X_EXT_OLD) {
- /* RFC 1826 */
- sumpos = (caddr_t)(ah + 1);
- } else {
- /* RFC 2402 */
- sumpos = (caddr_t)(((struct newah *)ah) + 1);
- }
+ if (sav->flags & SADB_X_EXT_OLD) {
+ /* RFC 1826 */
+ sumpos = (caddr_t)(ah + 1);
+ } else {
+ /* RFC 2402 */
+ sumpos = (caddr_t)(((struct newah *)ah) + 1);
+ }
- if (bcmp(sumpos, cksum, siz) != 0) {
- ipseclog((LOG_WARNING,
- "checksum mismatch in IPv6 AH input: %s %s\n",
- ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
- _FREE(cksum, M_TEMP);
- ipsec6stat.in_ahauthfail++;
- goto fail;
+ if (bcmp(sumpos, cksum, siz) != 0) {
+ ipseclog((LOG_WARNING,
+ "checksum mismatch in IPv6 AH input: %s %s\n",
+ ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
+ FREE(cksum, M_TEMP);
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_ahauthfail);
+ goto fail;
+ }
}
- }
- _FREE(cksum, M_TEMP);
+ FREE(cksum, M_TEMP);
m->m_flags |= M_AUTHIPHDR;
m->m_flags |= M_AUTHIPDGM;
sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4;
IP6_EXTHDR_CHECK(m, off, sizeof(struct ah) + sizoff + siz1
- + sizeof(struct ip6_hdr), IPPROTO_DONE);
+ + sizeof(struct ip6_hdr),
+ {return IPPROTO_DONE;});
nip6 = (struct ip6_hdr *)((u_char *)(ah + 1) + sizoff + siz1);
if (!IN6_ARE_ADDR_EQUAL(&nip6->ip6_src, &ip6->ip6_src)
- || !IN6_ARE_ADDR_EQUAL(&nip6->ip6_dst, &ip6->ip6_dst)) {
+ || !IN6_ARE_ADDR_EQUAL(&nip6->ip6_dst, &ip6->ip6_dst)) {
m->m_flags &= ~M_AUTHIPHDR;
m->m_flags &= ~M_AUTHIPDGM;
}
#endif
if (m->m_flags & M_AUTHIPHDR
- && m->m_flags & M_AUTHIPDGM) {
+ && m->m_flags & M_AUTHIPDGM) {
#if 0
ipseclog((LOG_DEBUG,
"IPv6 AH input: authentication succeess\n"));
#endif
- ipsec6stat.in_ahauthsucc++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_ahauthsucc);
} else {
ipseclog((LOG_WARNING,
"authentication failed in IPv6 AH input: %s %s\n",
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
- ipsec6stat.in_ahauthfail++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_ahauthfail);
goto fail;
}
/*
* update sequence number.
*/
- if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
- if (ipsec_updatereplay(ntohl(((struct newah *)ah)->ah_seq), sav)) {
- ipsec6stat.in_ahreplay++;
+ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay[0] != NULL) {
+ if (ipsec_updatereplay(ntohl(((struct newah *)ah)->ah_seq), sav, 0)) {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_ahreplay);
goto fail;
}
}
/* was it transmitted over the IPsec tunnel SA? */
- if (ipsec6_tunnel_validate(ip6, nxt, sav) && nxt == IPPROTO_IPV6) {
+ if (sav->flags & SADB_X_EXT_OLD) {
+ /* RFC 1826 */
+ stripsiz = sizeof(struct ah) + siz1;
+ } else {
+ /* RFC 2402 */
+ stripsiz = sizeof(struct newah) + siz1;
+ }
+ if (ipsec6_tunnel_validate(m, off + stripsiz, nxt, sav, &ifamily)) {
+ ifaddr_t ifa;
+ struct sockaddr_storage addr;
+ struct sockaddr_in6 *ip6addr;
/*
* strip off all the headers that precedes AH.
* IP6 xx AH IP6' payload -> IP6' payload
* XXX more sanity checks
* XXX relationship with gif?
*/
- size_t stripsiz = 0;
- u_int32_t flowinfo; /*net endian*/
+ u_int32_t flowinfo; /*net endian*/
- flowinfo = ip6->ip6_flow;
- if (sav->flags & SADB_X_EXT_OLD) {
- /* RFC 1826 */
- stripsiz = sizeof(struct ah) + siz1;
- } else {
- /* RFC 2402 */
- stripsiz = sizeof(struct newah) + siz1;
+ if (ifamily == AF_INET) {
+ ipseclog((LOG_NOTICE, "ipsec tunnel protocol mismatch "
+ "in IPv6 AH input: %s\n", ipsec_logsastr(sav)));
+ goto fail;
}
+
+ flowinfo = ip6->ip6_flow;
m_adj(m, off + stripsiz);
if (m->m_len < sizeof(*ip6)) {
/*
*/
m = m_pullup(m, sizeof(*ip6));
if (!m) {
- ipsec6stat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto fail;
}
}
ip6 = mtod(m, struct ip6_hdr *);
/* ECN consideration. */
- ip6_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip6->ip6_flow);
+ if (ip6_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip6->ip6_flow) == 0) {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
+ goto fail;
+ }
if (!key_checktunnelsanity(sav, AF_INET6,
- (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst)) {
+ (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst)) {
ipseclog((LOG_NOTICE, "ipsec tunnel address mismatch "
"in IPv6 AH input: %s %s\n",
ipsec6_logpacketstr(ip6, spi),
ipsec_logsastr(sav)));
- ipsec6stat.in_inval++;
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_inval);
goto fail;
}
-#if 0 /* XXX should we call ipfw rather than ipsec_in_reject? */
- /* drop it if it does not match the default policy */
- if (ipsec6_in_reject(m, NULL)) {
- ipsec6stat.in_polvio++;
- goto fail;
- }
-#endif
-
#if 1
/*
* should the inner packet be considered authentic?
#endif
key_sa_recordxfer(sav, m);
+ if (ipsec_addhist(m, IPPROTO_AH, spi) != 0 ||
+ ipsec_addhist(m, IPPROTO_IPV6, 0) != 0) {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_nomem);
+ goto fail;
+ }
+
+ 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);
+ }
+
+ // 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) {
+ 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 fail;
+ }
+ }
- s = splimp();
- if (IF_QFULL(&ip6intrq)) {
- ipsec6stat.in_inval++;
+ if (proto_input(PF_INET6, m) != 0) {
goto fail;
}
- IF_ENQUEUE(&ip6intrq, m);
- m = NULL;
- schednetisr(NETISR_IPV6); /*can be skipped but to make sure*/
- splx(s);
nxt = IPPROTO_DONE;
} else {
/*
* strip off AH.
- * We do deep-copy since KAME requires that
- * the packet is placed in a single mbuf.
*/
- size_t stripsiz = 0;
char *prvnxtp;
/*
prvnxtp = ip6_get_prevhdr(m, off); /* XXX */
*prvnxtp = nxt;
- if (sav->flags & SADB_X_EXT_OLD) {
- /* RFC 1826 */
- stripsiz = sizeof(struct ah) + siz1;
- } else {
- /* RFC 2402 */
- stripsiz = sizeof(struct newah) + siz1;
- }
-
ip6 = mtod(m, struct ip6_hdr *);
-#ifndef PULLDOWN_TEST
+ /*
+ * We do deep-copy since KAME requires that
+ * the packet is placed in a single mbuf.
+ */
ovbcopy((caddr_t)ip6, ((caddr_t)ip6) + stripsiz, off);
m->m_data += stripsiz;
m->m_len -= stripsiz;
m->m_pkthdr.len -= stripsiz;
-#else
- /*
- * even in m_pulldown case, we need to strip off AH so that
- * we can compute checksum for multiple AH correctly.
- */
- if (m->m_len >= stripsiz + off) {
- ovbcopy((caddr_t)ip6, ((caddr_t)ip6) + stripsiz, off);
- m->m_data += stripsiz;
- m->m_len -= stripsiz;
- m->m_pkthdr.len -= stripsiz;
- } else {
- /*
- * this comes with no copy if the boundary is on
- * cluster
- */
- struct mbuf *n;
-
- n = m_split(m, off, M_DONTWAIT);
- if (n == NULL) {
- /* m is retained by m_split */
- goto fail;
- }
- m_adj(n, stripsiz);
- m_cat(m, n);
- /* m_cat does not update m_pkthdr.len */
- m->m_pkthdr.len += n->m_pkthdr.len;
- }
-#endif
ip6 = mtod(m, struct ip6_hdr *);
/* XXX jumbogram */
ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz);
key_sa_recordxfer(sav, m);
+ if (ipsec_addhist(m, IPPROTO_AH, spi) != 0) {
+ IPSEC_STAT_INCREMENT(ipsec6stat.in_nomem);
+ goto fail;
+ }
+
+ // 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) {
+ 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 fail;
+ }
+ }
}
+done:
*offp = off;
*mp = m;
-
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP ah6_input call free SA:%p\n", sav));
- key_freesav(sav);
+ printf("DP ah6_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;
fail:
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP ah6_input call free SA:%p\n", sav));
- key_freesav(sav);
+ printf("DP ah6_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 IPPROTO_DONE;
}
+
+void
+ah6_ctlinput(int cmd, struct sockaddr *sa, void *d)
+{
+ const struct newah *ahp;
+ struct newah ah;
+ struct secasvar *sav;
+ struct ip6_hdr *ip6;
+ struct mbuf *m;
+ struct ip6ctlparam *ip6cp = NULL;
+ 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) {
+ /*
+ * 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(ah)) {
+ return;
+ }
+
+ if (m->m_len < off + sizeof(ah)) {
+ /*
+ * this should be rare case,
+ * so we compromise on this copy...
+ */
+ m_copydata(m, off, sizeof(ah), (caddr_t)&ah);
+ ahp = &ah;
+ } else {
+ ahp = (struct newah *)(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_AH, ahp->ah_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);
+ }
+
+ /* we normally notify single pcb here */
+ } else {
+ /* we normally notify any pcb here */
+ }
+}
#endif /* INET6 */
projects / apple / xnu.git / blobdiff