-/* $KAME: esp_input.c,v 1.22 2000/03/21 05:14:49 itojun Exp $ */
+/* $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.
* 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 <netinet/ip_var.h>
#include <netinet/in_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/in6_pcb.h>
#include <netinet6/ip6_var.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 <netinet6/esp.h>
+#if INET6
+#include <netinet6/esp6.h>
+#endif
#include <netkey/key.h>
#include <netkey/keydb.h>
#include <netkey/key_debug.h>
#if INET
extern struct protosw inetsw[];
-#if defined(__bsdi__) || defined(__NetBSD__)
-extern u_char ip_protox[];
-#endif
#define ESPMAXLEN \
(sizeof(struct esp) < sizeof(struct newesp) \
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;
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",
+ "unsupported encryption algorithm for spi %u\n",
(u_int32_t)ntohl(spi)));
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) {
&& (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;
/*
{
u_char sum0[AH_MAXSUMSIZE];
u_char sum[AH_MAXSUMSIZE];
- struct ah_algorithm *sumalgo;
+ const struct ah_algorithm *sumalgo;
size_t siz;
- sumalgo = &ah_algorithms[sav->alg_auth];
+ sumalgo = ah_algorithm_lookup(sav->alg_auth);
+ if (!sumalgo)
+ goto noreplaycheck;
siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
if (AH_MAXSUMSIZE < siz) {
ipseclog((LOG_DEBUG,
}
}
- {
+ /*
+ * 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)) {
- ipseclog((LOG_ERR, "decrypt fail in IPv4 ESP input: %s %s\n",
- ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
+ /* 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.
#endif
/* was it transmitted over the IPsec tunnel SA? */
- if (ipsec4_tunnel_validate(ip, nxt, sav)) {
+ 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
#endif
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;
+ }
s = splimp();
if (IF_QFULL(&ipintrq)) {
ipsecstat.in_inval++;
+ splx(s);
goto bad;
}
IF_ENQUEUE(&ipintrq, m);
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 (nxt != IPPROTO_DONE) {
+ if ((ip_protox[nxt]->pr_flags & PR_LASTHDR) != 0 &&
+ ipsec4_in_reject(m, NULL)) {
+ ipsecstat.in_polvio++;
+ goto bad;
+ }
(*ip_protox[nxt]->pr_input)(m, off);
- else
+ } else
m_freem(m);
m = NULL;
}
struct secasvar *sav = NULL;
size_t taillen;
u_int16_t nxt;
- struct esp_algorithm *algo;
+ const struct esp_algorithm *algo;
int ivlen;
size_t esplen;
int s;
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",
+ "unsupported encryption algorithm for spi %u\n",
(u_int32_t)ntohl(spi)));
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) {
&& (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;
/*
{
u_char sum0[AH_MAXSUMSIZE];
u_char sum[AH_MAXSUMSIZE];
- struct ah_algorithm *sumalgo;
+ const struct ah_algorithm *sumalgo;
size_t siz;
- sumalgo = &ah_algorithms[sav->alg_auth];
+ sumalgo = ah_algorithm_lookup(sav->alg_auth);
+ if (!sumalgo)
+ goto noreplaycheck;
siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
if (AH_MAXSUMSIZE < siz) {
ipseclog((LOG_DEBUG,
#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)) {
- ipseclog((LOG_ERR, "decrypt fail in IPv6 ESP input: %s %s\n",
- ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
+ /* 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;
}
ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - taillen);
/* was it transmitted over the IPsec tunnel SA? */
- if (ipsec6_tunnel_validate(ip6, nxt, sav)) {
+ 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
#endif
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;
+ }
s = splimp();
if (IF_QFULL(&ip6intrq)) {
ipsec6stat.in_inval++;
+ splx(s);
goto bad;
}
IF_ENQUEUE(&ip6intrq, m);
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_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));
+ m_adj(m, maxlen);
+ n->m_len = maxlen;
+ n->m_pkthdr.len = m->m_pkthdr.len;
+ n->m_next = m;
+ 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) {
+ ipsec6stat.in_nomem++;
+ goto bad;
+ }
}
*offp = off;
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;
+ }
+
+ 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.
+ */
+ sav = key_allocsa(AF_INET6,
+ (caddr_t)&sa6_src.sin6_addr,
+ (caddr_t)&sa6_dst, 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 */
projects / apple / xnu.git / blobdiff