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-rw-r--r--sys/netinet6/esp_input.c981
1 files changed, 981 insertions, 0 deletions
diff --git a/sys/netinet6/esp_input.c b/sys/netinet6/esp_input.c
new file mode 100644
index 0000000..43f0a61
--- /dev/null
+++ b/sys/netinet6/esp_input.c
@@ -0,0 +1,981 @@
+/* $FreeBSD$ */
+/* $KAME: esp_input.c,v 1.62 2002/01/07 11:39:57 kjc Exp $ */
+
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * RFC1827/2406 Encapsulated Security Payload.
+ */
+
+#include "opt_inet.h"
+#include "opt_inet6.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mbuf.h>
+#include <sys/domain.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/errno.h>
+#include <sys/time.h>
+#include <sys/syslog.h>
+
+#include <net/if.h>
+#include <net/route.h>
+#include <net/netisr.h>
+#include <machine/cpu.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/in_var.h>
+#include <netinet/ip_ecn.h>
+#ifdef INET6
+#include <netinet6/ip6_ecn.h>
+#endif
+
+#ifdef INET6
+#include <netinet/ip6.h>
+#include <netinet/in_pcb.h>
+#include <netinet6/in6_pcb.h>
+#include <netinet6/ip6_var.h>
+#include <netinet/icmp6.h>
+#include <netinet6/ip6protosw.h>
+#endif
+
+#include <netinet6/ipsec.h>
+#ifdef INET6
+#include <netinet6/ipsec6.h>
+#endif
+#include <netinet6/ah.h>
+#ifdef INET6
+#include <netinet6/ah6.h>
+#endif
+#include <netinet6/esp.h>
+#ifdef INET6
+#include <netinet6/esp6.h>
+#endif
+#include <netkey/key.h>
+#include <netkey/keydb.h>
+#include <netkey/key_debug.h>
+
+#include <machine/stdarg.h>
+
+#include <net/net_osdep.h>
+
+#define IPLEN_FLIPPED
+
+#define ESPMAXLEN \
+ (sizeof(struct esp) < sizeof(struct newesp) \
+ ? sizeof(struct newesp) : sizeof(struct esp))
+
+#ifdef INET
+extern struct protosw inetsw[];
+
+void
+esp4_input(m, off)
+ struct mbuf *m;
+ int off;
+{
+ struct ip *ip;
+ struct esp *esp;
+ struct esptail esptail;
+ u_int32_t spi;
+ struct secasvar *sav = NULL;
+ size_t taillen;
+ u_int16_t nxt;
+ const struct esp_algorithm *algo;
+ int ivlen;
+ size_t hlen;
+ size_t esplen;
+ int proto;
+
+ /* 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++;
+ goto bad;
+ }
+
+ if (m->m_len < off + ESPMAXLEN) {
+ m = m_pullup(m, off + ESPMAXLEN);
+ if (!m) {
+ ipseclog((LOG_DEBUG,
+ "IPv4 ESP input: can't pullup in esp4_input\n"));
+ ipsecstat.in_inval++;
+ goto bad;
+ }
+ }
+
+ ip = mtod(m, struct ip *);
+ proto = ip->ip_p;
+ esp = (struct esp *)(((u_int8_t *)ip) + off);
+#ifdef _IP_VHL
+ hlen = 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) {
+ ipseclog((LOG_WARNING,
+ "IPv4 ESP input: no key association found for spi %u\n",
+ (u_int32_t)ntohl(spi)));
+ ipsecstat.in_nosa++;
+ goto bad;
+ }
+ KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
+ printf("DP esp4_input called to allocate SA:%p\n", sav));
+ if (sav->state != SADB_SASTATE_MATURE
+ && 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++;
+ goto bad;
+ }
+ algo = esp_algorithm_lookup(sav->alg_enc);
+ if (!algo) {
+ ipseclog((LOG_DEBUG, "IPv4 ESP input: "
+ "unsupported encryption algorithm for spi %u\n",
+ (u_int32_t)ntohl(spi)));
+ ipsecstat.in_badspi++;
+ goto bad;
+ }
+
+ /* 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++;
+ goto bad;
+ }
+
+ if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
+ && (sav->alg_auth && sav->key_auth)))
+ goto noreplaycheck;
+
+ 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))
+ ; /* okey */
+ else {
+ ipsecstat.in_espreplay++;
+ ipseclog((LOG_WARNING,
+ "replay packet in IPv4 ESP input: %s %s\n",
+ ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
+ goto bad;
+ }
+
+ /* check ICV */
+ {
+ u_char sum0[AH_MAXSUMSIZE];
+ u_char sum[AH_MAXSUMSIZE];
+ const struct ah_algorithm *sumalgo;
+ size_t siz;
+
+ 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) {
+ ipsecstat.in_inval++;
+ goto bad;
+ }
+ 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;
+ }
+
+ m_copydata(m, m->m_pkthdr.len - siz, siz, &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 (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;
+ }
+
+ /* strip off the authentication data */
+ m_adj(m, -siz);
+ ip = mtod(m, struct ip *);
+#ifdef IPLEN_FLIPPED
+ ip->ip_len = ip->ip_len - siz;
+#else
+ ip->ip_len = htons(ntohs(ip->ip_len) - siz);
+#endif
+ m->m_flags |= M_AUTHIPDGM;
+ 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++;
+ goto bad;
+ }
+ }
+
+noreplaycheck:
+
+ /* process main esp header. */
+ if (sav->flags & SADB_X_EXT_OLD) {
+ /* RFC 1827 */
+ esplen = sizeof(struct esp);
+ } else {
+ /* RFC 2406 */
+ if (sav->flags & SADB_X_EXT_DERIV)
+ esplen = sizeof(struct esp);
+ 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++;
+ goto bad;
+ }
+
+ if (m->m_len < off + esplen + ivlen) {
+ m = m_pullup(m, off + esplen + ivlen);
+ if (!m) {
+ ipseclog((LOG_DEBUG,
+ "IPv4 ESP input: can't pullup in esp4_input\n"));
+ ipsecstat.in_inval++;
+ goto bad;
+ }
+ }
+
+ /*
+ * pre-compute and cache intermediate key
+ */
+ if (esp_schedule(algo, sav) != 0) {
+ ipsecstat.in_inval++;
+ goto bad;
+ }
+
+ /*
+ * decrypt the packet.
+ */
+ if (!algo->decrypt)
+ panic("internal error: no decrypt function");
+ if ((*algo->decrypt)(m, off, sav, algo, ivlen)) {
+ /* m is already freed */
+ m = NULL;
+ ipseclog((LOG_ERR, "decrypt fail in IPv4 ESP input: %s\n",
+ ipsec_logsastr(sav)));
+ ipsecstat.in_inval++;
+ goto bad;
+ }
+ ipsecstat.in_esphist[sav->alg_enc]++;
+
+ m->m_flags |= M_DECRYPTED;
+
+ /*
+ * find the trailer of the ESP.
+ */
+ m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(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) { /* ? */
+ ipseclog((LOG_WARNING,
+ "bad pad length in IPv4 ESP input: %s %s\n",
+ ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
+ ipsecstat.in_inval++;
+ goto bad;
+ }
+
+ /* strip off the trailing pad area. */
+ m_adj(m, -taillen);
+
+#ifdef IPLEN_FLIPPED
+ ip->ip_len = ip->ip_len - taillen;
+#else
+ ip->ip_len = htons(ntohs(ip->ip_len) - taillen);
+#endif
+
+ /* was it transmitted over the IPsec tunnel SA? */
+ if (ipsec4_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) {
+ /*
+ * 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;
+
+ 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++;
+ 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,
+ (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++;
+ goto bad;
+ }
+
+ key_sa_recordxfer(sav, m);
+ if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 ||
+ ipsec_addhist(m, IPPROTO_IPV4, 0) != 0) {
+ ipsecstat.in_nomem++;
+ goto bad;
+ }
+
+ if (! netisr_queue(NETISR_IP, m)) {
+ ipsecstat.in_inval++;
+ m = NULL;
+ goto bad;
+ }
+ m = NULL;
+ nxt = IPPROTO_DONE;
+ } else {
+ /*
+ * strip off ESP header and IV.
+ * even in m_pulldown case, we need to strip off ESP so that
+ * we can always compute checksum for AH correctly.
+ */
+ size_t stripsiz;
+
+ stripsiz = esplen + ivlen;
+
+ ip = mtod(m, struct ip *);
+ ovbcopy((caddr_t)ip, (caddr_t)(((u_char *)ip) + stripsiz), off);
+ m->m_data += stripsiz;
+ m->m_len -= stripsiz;
+ m->m_pkthdr.len -= stripsiz;
+
+ ip = mtod(m, struct ip *);
+#ifdef IPLEN_FLIPPED
+ ip->ip_len = ip->ip_len - stripsiz;
+#else
+ ip->ip_len = htons(ntohs(ip->ip_len) - stripsiz);
+#endif
+ ip->ip_p = nxt;
+
+ key_sa_recordxfer(sav, m);
+ if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) {
+ ipsecstat.in_nomem++;
+ goto bad;
+ }
+
+ if (nxt != IPPROTO_DONE) {
+ if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
+ ipsec4_in_reject(m, NULL)) {
+ ipsecstat.in_polvio++;
+ goto bad;
+ }
+ (*inetsw[ip_protox[nxt]].pr_input)(m, off);
+ } else
+ m_freem(m);
+ m = NULL;
+ }
+
+ if (sav) {
+ KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
+ printf("DP esp4_input call free SA:%p\n", sav));
+ key_freesav(sav);
+ }
+ ipsecstat.in_success++;
+ return;
+
+bad:
+ if (sav) {
+ KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
+ printf("DP esp4_input call free SA:%p\n", sav));
+ key_freesav(sav);
+ }
+ if (m)
+ m_freem(m);
+ return;
+}
+#endif /* INET */
+
+#ifdef INET6
+int
+esp6_input(mp, offp, proto)
+ struct mbuf **mp;
+ int *offp, proto;
+{
+ struct mbuf *m = *mp;
+ int off = *offp;
+ struct ip6_hdr *ip6;
+ struct esp *esp;
+ struct esptail esptail;
+ u_int32_t spi;
+ struct secasvar *sav = NULL;
+ size_t taillen;
+ u_int16_t nxt;
+ const struct esp_algorithm *algo;
+ int ivlen;
+ size_t esplen;
+
+ /* 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++;
+ goto bad;
+ }
+
+#ifndef PULLDOWN_TEST
+ IP6_EXTHDR_CHECK(m, off, ESPMAXLEN, IPPROTO_DONE);
+ esp = (struct esp *)(mtod(m, caddr_t) + off);
+#else
+ IP6_EXTHDR_GET(esp, struct esp *, m, off, ESPMAXLEN);
+ if (esp == NULL) {
+ ipsec6stat.in_inval++;
+ return IPPROTO_DONE;
+ }
+#endif
+ 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++;
+ 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) {
+ ipseclog((LOG_WARNING,
+ "IPv6 ESP input: no key association found for spi %u\n",
+ (u_int32_t)ntohl(spi)));
+ ipsec6stat.in_nosa++;
+ goto bad;
+ }
+ KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
+ printf("DP esp6_input called to allocate SA:%p\n", sav));
+ if (sav->state != SADB_SASTATE_MATURE
+ && 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++;
+ goto bad;
+ }
+ algo = esp_algorithm_lookup(sav->alg_enc);
+ if (!algo) {
+ ipseclog((LOG_DEBUG, "IPv6 ESP input: "
+ "unsupported encryption algorithm for spi %u\n",
+ (u_int32_t)ntohl(spi)));
+ ipsec6stat.in_badspi++;
+ goto bad;
+ }
+
+ /* 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++;
+ goto bad;
+ }
+
+ if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
+ && (sav->alg_auth && sav->key_auth)))
+ goto noreplaycheck;
+
+ 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))
+ ; /* okey */
+ else {
+ ipsec6stat.in_espreplay++;
+ ipseclog((LOG_WARNING,
+ "replay packet in IPv6 ESP input: %s %s\n",
+ ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
+ goto bad;
+ }
+
+ /* check ICV */
+ {
+ u_char sum0[AH_MAXSUMSIZE];
+ u_char sum[AH_MAXSUMSIZE];
+ const struct ah_algorithm *sumalgo;
+ size_t siz;
+
+ 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) {
+ ipsecstat.in_inval++;
+ goto bad;
+ }
+ 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;
+ }
+
+ m_copydata(m, m->m_pkthdr.len - siz, siz, &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 (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;
+ }
+
+ /* strip off the authentication data */
+ m_adj(m, -siz);
+ ip6 = mtod(m, struct ip6_hdr *);
+ ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - siz);
+
+ m->m_flags |= M_AUTHIPDGM;
+ 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++;
+ goto bad;
+ }
+ }
+
+noreplaycheck:
+
+ /* process main esp header. */
+ if (sav->flags & SADB_X_EXT_OLD) {
+ /* RFC 1827 */
+ esplen = sizeof(struct esp);
+ } else {
+ /* RFC 2406 */
+ if (sav->flags & SADB_X_EXT_DERIV)
+ esplen = sizeof(struct esp);
+ 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++;
+ goto bad;
+ }
+
+#ifndef PULLDOWN_TEST
+ IP6_EXTHDR_CHECK(m, off, esplen + ivlen, IPPROTO_DONE); /* XXX */
+#else
+ IP6_EXTHDR_GET(esp, struct esp *, m, off, esplen + ivlen);
+ if (esp == NULL) {
+ ipsec6stat.in_inval++;
+ m = NULL;
+ goto bad;
+ }
+#endif
+ ip6 = mtod(m, struct ip6_hdr *); /* set it again just in case */
+
+ /*
+ * pre-compute and cache intermediate key
+ */
+ if (esp_schedule(algo, sav) != 0) {
+ ipsec6stat.in_inval++;
+ goto bad;
+ }
+
+ /*
+ * decrypt the packet.
+ */
+ if (!algo->decrypt)
+ panic("internal error: no decrypt function");
+ if ((*algo->decrypt)(m, off, sav, algo, ivlen)) {
+ /* m is already freed */
+ m = NULL;
+ ipseclog((LOG_ERR, "decrypt fail in IPv6 ESP input: %s\n",
+ ipsec_logsastr(sav)));
+ ipsec6stat.in_inval++;
+ goto bad;
+ }
+ ipsec6stat.in_esphist[sav->alg_enc]++;
+
+ m->m_flags |= M_DECRYPTED;
+
+ /*
+ * find the trailer of the ESP.
+ */
+ m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(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)) { /* ? */
+ ipseclog((LOG_WARNING,
+ "bad pad length in IPv6 ESP input: %s %s\n",
+ ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
+ ipsec6stat.in_inval++;
+ goto bad;
+ }
+
+ /* strip off the trailing pad area. */
+ m_adj(m, -taillen);
+
+ ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - taillen);
+
+ /* was it transmitted over the IPsec tunnel SA? */
+ if (ipsec6_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) {
+ /*
+ * 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 */
+ flowinfo = ip6->ip6_flow;
+ m_adj(m, off + esplen + ivlen);
+ if (m->m_len < sizeof(*ip6)) {
+#ifndef PULLDOWN_TEST
+ /*
+ * m_pullup is prohibited in KAME IPv6 input processing
+ * but there's no other way!
+ */
+#else
+ /* okay to pullup in m_pulldown style */
+#endif
+ m = m_pullup(m, sizeof(*ip6));
+ if (!m) {
+ 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,
+ (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;
+ }
+
+ key_sa_recordxfer(sav, m);
+ if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 ||
+ ipsec_addhist(m, IPPROTO_IPV6, 0) != 0) {
+ ipsec6stat.in_nomem++;
+ goto bad;
+ }
+
+ if (! netisr_queue(NETISR_IPV6, m)) {
+ ipsec6stat.in_inval++;
+ m = NULL;
+ goto bad;
+ }
+ m = NULL;
+ nxt = IPPROTO_DONE;
+ } else {
+ /*
+ * strip off ESP header and IV.
+ * even in m_pulldown case, we need to strip off ESP so that
+ * we can always compute checksum for AH correctly.
+ */
+ size_t stripsiz;
+ char *prvnxtp;
+
+ /*
+ * Set the next header field of the previous header correctly.
+ */
+ prvnxtp = ip6_get_prevhdr(m, off); /* XXX */
+ *prvnxtp = nxt;
+
+ stripsiz = esplen + ivlen;
+
+ ip6 = mtod(m, struct ip6_hdr *);
+ 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 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;
+ }
+
+#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);
+ maxlen = MHLEN;
+ if (n)
+ M_MOVE_PKTHDR(n, m);
+ if (n && n->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 (n->m_pkthdr.len <= maxlen) {
+ m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
+ n->m_len = n->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_next = m;
+ m_adj(m, maxlen);
+ }
+ 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) {
+ ipsec6stat.in_nomem++;
+ goto bad;
+ }
+ }
+
+ *offp = off;
+ *mp = m;
+
+ if (sav) {
+ KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
+ printf("DP esp6_input call free SA:%p\n", sav));
+ key_freesav(sav);
+ }
+ 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);
+ }
+ if (m)
+ m_freem(m);
+ return IPPROTO_DONE;
+}
+
+void
+esp6_ctlinput(cmd, sa, d)
+ int cmd;
+ struct sockaddr *sa;
+ void *d;
+{
+ const struct newesp *espp;
+ struct newesp esp;
+ struct ip6ctlparam *ip6cp = NULL, ip6cp1;
+ struct secasvar *sav;
+ struct ip6_hdr *ip6;
+ struct mbuf *m;
+ int off;
+ 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;
+ off = 0; /* calm gcc */
+ }
+
+ 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*)(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 *)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);
+ }
+
+ /* 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 */
+ }
+}
+#endif /* INET6 */
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