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1404c3a4b8
freebsd/sys/netinet6/ipsec.c
Hajimu UMEMOTO d34fd3c7e0 reported from VANHULLEBUS Yvan [remote kernel crash may result] 
Submitted by:	itojun
Obtained from:	KAME
MFC after:	1 day
2005-03-09 14:39:48 +00:00

3634 lines
84 KiB
C
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/* $FreeBSD$ */
/* $KAME: ipsec.c,v 1.207 2004/01/13 03:30:42 itojun 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.
*/
/*
* IPsec controller part.
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <net/if.h>
#include <net/route.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/udp.h>
#include <netinet/udp_var.h>
#include <netinet/ip_ecn.h>
#ifdef INET6
#include <netinet6/ip6_ecn.h>
#endif
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip6.h>
#ifdef INET6
#include <netinet6/ip6_var.h>
#endif
#include <netinet/in_pcb.h>
#ifdef INET6
#include <netinet/icmp6.h>
#endif
#include <netinet6/ipsec.h>
#ifdef INET6
#include <netinet6/ipsec6.h>
#endif
#include <netinet6/ah.h>
#ifdef INET6
#include <netinet6/ah6.h>
#endif
#ifdef IPSEC_ESP
#include <netinet6/esp.h>
#ifdef INET6
#include <netinet6/esp6.h>
#endif
#endif
#include <netinet6/ipcomp.h>
#ifdef INET6
#include <netinet6/ipcomp6.h>
#endif
#include <netkey/key.h>
#include <netkey/keydb.h>
#include <netkey/key_debug.h>
#include <machine/in_cksum.h>
#include <net/net_osdep.h>
#ifdef IPSEC_DEBUG
int ipsec_debug = 1;
#else
int ipsec_debug = 0;
#endif
NET_NEEDS_GIANT("ipsec");
struct ipsecstat ipsecstat;
int ip4_ah_cleartos = 1;
int ip4_ah_offsetmask = 0; /* maybe IP_DF? */
int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */
int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
struct secpolicy *ip4_def_policy;
int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
int ip4_esp_randpad = -1;
static int sp_cachegen = 1; /* cache generation # */
SYSCTL_DECL(_net_inet_ipsec);
#ifdef INET6
SYSCTL_DECL(_net_inet6_ipsec6);
#endif
/* net.inet.ipsec */
SYSCTL_STRUCT(_net_inet_ipsec, IPSECCTL_STATS,
stats, CTLFLAG_RD, &ipsecstat, ipsecstat, "");
#if 0
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
def_policy, CTLFLAG_RW, &ip4_def_policy->policy, 0, "");
#endif
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
CTLFLAG_RW, &ip4_esp_net_deflev, 0, "");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
ah_cleartos, CTLFLAG_RW, &ip4_ah_cleartos, 0, "");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, "");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, "");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
debug, CTLFLAG_RW, &ipsec_debug, 0, "");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, "");
#ifdef INET6
struct ipsecstat ipsec6stat;
int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
struct secpolicy *ip6_def_policy;
int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
int ip6_esp_randpad = -1;
/* net.inet6.ipsec6 */
SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS,
stats, CTLFLAG_RD, &ipsec6stat, ipsecstat, "");
#if 0
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
def_policy, CTLFLAG_RW, &ip6_def_policy->policy, 0, "");
#endif
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
CTLFLAG_RW, &ip6_esp_net_deflev, 0, "");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
debug, CTLFLAG_RW, &ipsec_debug, 0, "");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, "");
#endif /* INET6 */
static struct secpolicy *ipsec_checkpcbcache __P((struct mbuf *,
struct inpcbpolicy *, int));
static int ipsec_fillpcbcache __P((struct inpcbpolicy *, struct mbuf *,
struct secpolicy *, int));
static int ipsec_invalpcbcache __P((struct inpcbpolicy *, int));
static int ipsec_setspidx_mbuf
__P((struct secpolicyindex *, int, struct mbuf *, int));
static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
static void ipsec4_get_ulp __P((struct mbuf *, struct secpolicyindex *, int));
static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
#ifdef INET6
static void ipsec6_get_ulp __P((struct mbuf *, struct secpolicyindex *, int));
static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
#endif
static struct inpcbpolicy *ipsec_newpcbpolicy __P((void));
static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
#if 0
static int ipsec_deepcopy_pcbpolicy __P((struct inpcbpolicy *));
#endif
static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *));
static int ipsec_set_policy
__P((struct secpolicy **, int, caddr_t, size_t, int));
static int ipsec_get_policy __P((struct secpolicy *, struct mbuf **));
static void vshiftl __P((unsigned char *, int, int));
static int ipsec_in_reject __P((struct secpolicy *, struct mbuf *));
static size_t ipsec_hdrsiz __P((struct secpolicy *));
#ifdef INET
static struct mbuf *ipsec4_splithdr __P((struct mbuf *));
#endif
#ifdef INET6
static struct mbuf *ipsec6_splithdr __P((struct mbuf *));
#endif
#ifdef INET
static int ipsec4_encapsulate __P((struct mbuf *, struct secasvar *));
#endif
#ifdef INET6
static int ipsec6_encapsulate __P((struct mbuf *, struct secasvar *));
#endif
static struct ipsecaux *ipsec_addaux __P((struct mbuf *));
static struct ipsecaux *ipsec_findaux __P((struct mbuf *));
static void ipsec_optaux __P((struct mbuf *, struct ipsecaux *));
#ifdef INET
static int ipsec4_checksa __P((struct ipsecrequest *,
struct ipsec_output_state *));
#endif
#ifdef INET6
static int ipsec6_checksa __P((struct ipsecrequest *,
struct ipsec_output_state *, int));
#endif
/*
* try to validate and use cached policy on a pcb.
*/
static struct secpolicy *
ipsec_checkpcbcache(m, pcbsp, dir)
struct mbuf *m;
struct inpcbpolicy *pcbsp;
int dir;
{
struct secpolicyindex spidx;
struct timeval mono_time;
microtime(&mono_time);
switch (dir) {
case IPSEC_DIR_INBOUND:
case IPSEC_DIR_OUTBOUND:
case IPSEC_DIR_ANY:
break;
default:
return NULL;
}
#ifdef DIAGNOSTIC
if (dir >= sizeof(pcbsp->cache)/sizeof(pcbsp->cache[0]))
panic("dir too big in ipsec_checkpcbcache");
#endif
/* SPD table change invalidates all the caches */
if (pcbsp->cachegen[dir] == 0 || sp_cachegen > pcbsp->cachegen[dir]) {
ipsec_invalpcbcache(pcbsp, dir);
return NULL;
}
if (!pcbsp->cache[dir])
return NULL;
if (pcbsp->cache[dir]->state != IPSEC_SPSTATE_ALIVE) {
ipsec_invalpcbcache(pcbsp, dir);
return NULL;
}
if ((pcbsp->cacheflags & IPSEC_PCBSP_CONNECTED) == 0) {
if (!pcbsp->cache[dir])
return NULL;
if (ipsec_setspidx(m, &spidx, 1) != 0)
return NULL;
if (bcmp(&pcbsp->cacheidx[dir], &spidx, sizeof(spidx))) {
if (!pcbsp->cache[dir]->spidx ||
!key_cmpspidx_withmask(pcbsp->cache[dir]->spidx,
&spidx))
return NULL;
pcbsp->cacheidx[dir] = spidx;
}
} else {
/*
* The pcb is connected, and the L4 code is sure that:
* - outgoing side uses inp_[lf]addr
* - incoming side looks up policy after inpcb lookup
* and address pair is known to be stable. We do not need
* to generate spidx again, nor check the address match again.
*
* For IPv4/v6 SOCK_STREAM sockets, this assumption holds
* and there are calls to ipsec_pcbconn() from in_pcbconnect().
*/
}
pcbsp->cache[dir]->lastused = mono_time.tv_sec;
pcbsp->cache[dir]->refcnt++;
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n",
pcbsp->cache[dir]->refcnt, pcbsp->cache[dir]));
return pcbsp->cache[dir];
}
static int
ipsec_fillpcbcache(pcbsp, m, sp, dir)
struct inpcbpolicy *pcbsp;
struct mbuf *m;
struct secpolicy *sp;
int dir;
{
switch (dir) {
case IPSEC_DIR_INBOUND:
case IPSEC_DIR_OUTBOUND:
break;
default:
return EINVAL;
}
#ifdef DIAGNOSTIC
if (dir >= sizeof(pcbsp->cache)/sizeof(pcbsp->cache[0]))
panic("dir too big in ipsec_checkpcbcache");
#endif
if (pcbsp->cache[dir])
key_freesp(pcbsp->cache[dir]);
pcbsp->cache[dir] = NULL;
if (ipsec_setspidx(m, &pcbsp->cacheidx[dir], 1) != 0) {
return EINVAL;
}
pcbsp->cache[dir] = sp;
if (pcbsp->cache[dir]) {
pcbsp->cache[dir]->refcnt++;
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n",
pcbsp->cache[dir]->refcnt, pcbsp->cache[dir]));
}
pcbsp->cachegen[dir] = sp_cachegen;
return 0;
}
static int
ipsec_invalpcbcache(pcbsp, dir)
struct inpcbpolicy *pcbsp;
int dir;
{
int i;
for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) {
if (dir != IPSEC_DIR_ANY && i != dir)
continue;
if (pcbsp->cache[i])
key_freesp(pcbsp->cache[i]);
pcbsp->cache[i] = NULL;
pcbsp->cachegen[i] = 0;
bzero(&pcbsp->cacheidx[i], sizeof(pcbsp->cacheidx[i]));
}
return 0;
}
int
ipsec_pcbconn(pcbsp)
struct inpcbpolicy *pcbsp;
{
pcbsp->cacheflags |= IPSEC_PCBSP_CONNECTED;
ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
return 0;
}
int
ipsec_pcbdisconn(pcbsp)
struct inpcbpolicy *pcbsp;
{
pcbsp->cacheflags &= ~IPSEC_PCBSP_CONNECTED;
ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
return 0;
}
int
ipsec_invalpcbcacheall()
{
sp_cachegen++;
return 0;
}
/*
* For OUTBOUND packet having a socket. Searching SPD for packet,
* and return a pointer to SP.
* OUT: NULL: no apropreate SP found, the following value is set to error.
* 0 : bypass
* EACCES : discard packet.
* ENOENT : ipsec_acquire() in progress, maybe.
* others : error occured.
* others: a pointer to SP
*
* NOTE: IPv6 mapped adddress concern is implemented here.
*/
struct secpolicy *
ipsec4_getpolicybypcb(m, dir, inp, error)
struct mbuf *m;
u_int dir;
struct inpcb *inp;
int *error;
{
struct inpcbpolicy *pcbsp = NULL;
struct secpolicy *currsp = NULL; /* policy on socket */
struct secpolicy *kernsp = NULL; /* policy on kernel */
struct secpolicyindex spidx;
u_int16_t tag;
/* sanity check */
if (m == NULL || inp == NULL || error == NULL)
panic("ipsec4_getpolicybypcb: NULL pointer was passed.");
pcbsp = inp->inp_sp;
#ifdef DIAGNOSTIC
if (pcbsp == NULL)
panic("ipsec4_getpolicybypcb: pcbsp is NULL.");
#endif
tag = 0;
/* if we have a cached entry, and if it is still valid, use it. */
ipsecstat.spdcachelookup++;
currsp = ipsec_checkpcbcache(m, pcbsp, dir);
if (currsp) {
*error = 0;
return currsp;
}
ipsecstat.spdcachemiss++;
switch (dir) {
case IPSEC_DIR_INBOUND:
currsp = pcbsp->sp_in;
break;
case IPSEC_DIR_OUTBOUND:
currsp = pcbsp->sp_out;
break;
default:
panic("ipsec4_getpolicybypcb: illegal direction.");
}
/* sanity check */
if (currsp == NULL)
panic("ipsec4_getpolicybypcb: currsp is NULL.");
/* when privileged socket */
if (pcbsp->priv) {
switch (currsp->policy) {
case IPSEC_POLICY_BYPASS:
currsp->refcnt++;
*error = 0;
ipsec_fillpcbcache(pcbsp, m, currsp, dir);
return currsp;
case IPSEC_POLICY_ENTRUST:
/* look for a policy in SPD */
if (ipsec_setspidx_mbuf(&spidx, AF_INET, m, 1) == 0 &&
(kernsp = key_allocsp(tag, &spidx, dir)) != NULL) {
/* SP found */
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec4_getpolicybypcb called "
"to allocate SP:%p\n", kernsp));
*error = 0;
ipsec_fillpcbcache(pcbsp, m, kernsp, dir);
return kernsp;
}
/* no SP found */
ip4_def_policy->refcnt++;
*error = 0;
ipsec_fillpcbcache(pcbsp, m, ip4_def_policy, dir);
return ip4_def_policy;
case IPSEC_POLICY_IPSEC:
currsp->refcnt++;
*error = 0;
ipsec_fillpcbcache(pcbsp, m, currsp, dir);
return currsp;
default:
ipseclog((LOG_ERR, "ipsec4_getpolicybypcb: "
"Invalid policy for PCB %d\n", currsp->policy));
*error = EINVAL;
return NULL;
}
/* NOTREACHED */
}
/* when non-privileged socket */
/* look for a policy in SPD */
if (ipsec_setspidx_mbuf(&spidx, AF_INET, m, 1) == 0 &&
(kernsp = key_allocsp(tag, &spidx, dir)) != NULL) {
/* SP found */
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec4_getpolicybypcb called "
"to allocate SP:%p\n", kernsp));
*error = 0;
ipsec_fillpcbcache(pcbsp, m, kernsp, dir);
return kernsp;
}
/* no SP found */
switch (currsp->policy) {
case IPSEC_POLICY_BYPASS:
ipseclog((LOG_ERR, "ipsec4_getpolicybypcb: "
"Illegal policy for non-privileged defined %d\n",
currsp->policy));
*error = EINVAL;
return NULL;
case IPSEC_POLICY_ENTRUST:
ip4_def_policy->refcnt++;
*error = 0;
ipsec_fillpcbcache(pcbsp, m, ip4_def_policy, dir);
return ip4_def_policy;
case IPSEC_POLICY_IPSEC:
currsp->refcnt++;
*error = 0;
ipsec_fillpcbcache(pcbsp, m, currsp, dir);
return currsp;
default:
ipseclog((LOG_ERR, "ipsec4_getpolicybypcb: "
"Invalid policy for PCB %d\n", currsp->policy));
*error = EINVAL;
return NULL;
}
/* NOTREACHED */
}
/*
* For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
* and return a pointer to SP.
* OUT: positive: a pointer to the entry for security policy leaf matched.
* NULL: no apropreate SP found, the following value is set to error.
* 0 : bypass
* EACCES : discard packet.
* ENOENT : ipsec_acquire() in progress, maybe.
* others : error occured.
*/
struct secpolicy *
ipsec4_getpolicybyaddr(m, dir, flag, error)
struct mbuf *m;
u_int dir;
int flag;
int *error;
{
struct secpolicy *sp = NULL;
u_int16_t tag;
/* sanity check */
if (m == NULL || error == NULL)
panic("ipsec4_getpolicybyaddr: NULL pointer was passed.");
/* get a policy entry matched with the packet */
{
struct secpolicyindex spidx;
bzero(&spidx, sizeof(spidx));
/* make an index to look for a policy */
*error = ipsec_setspidx_mbuf(&spidx, AF_INET, m,
(flag & IP_FORWARDING) ? 0 : 1);
if (*error != 0)
return NULL;
tag = 0;
sp = key_allocsp(tag, &spidx, dir);
}
/* SP found */
if (sp != NULL) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec4_getpolicybyaddr called "
"to allocate SP:%p\n", sp));
*error = 0;
return sp;
}
/* no SP found */
ip4_def_policy->refcnt++;
*error = 0;
return ip4_def_policy;
}
#ifdef INET6
/*
* For OUTBOUND packet having a socket. Searching SPD for packet,
* and return a pointer to SP.
* OUT: NULL: no apropreate SP found, the following value is set to error.
* 0 : bypass
* EACCES : discard packet.
* ENOENT : ipsec_acquire() in progress, maybe.
* others : error occured.
* others: a pointer to SP
*/
struct secpolicy *
ipsec6_getpolicybypcb(m, dir, inp, error)
struct mbuf *m;
u_int dir;
struct inpcb *inp;
int *error;
{
struct inpcbpolicy *pcbsp = NULL;
struct secpolicy *currsp = NULL; /* policy on socket */
struct secpolicy *kernsp = NULL; /* policy on kernel */
struct secpolicyindex spidx;
u_int16_t tag;
/* sanity check */
if (m == NULL || inp == NULL || error == NULL)
panic("ipsec6_getpolicybypcb: NULL pointer was passed.");
#ifdef DIAGNOSTIC
if ((inp->inp_vflag & INP_IPV6PROTO) == 0)
panic("ipsec6_getpolicybypcb: socket domain != inet6");
#endif
pcbsp = inp->in6p_sp;
#ifdef DIAGNOSTIC
if (pcbsp == NULL)
panic("ipsec6_getpolicybypcb: pcbsp is NULL.");
#endif
tag = 0;
/* if we have a cached entry, and if it is still valid, use it. */
ipsec6stat.spdcachelookup++;
currsp = ipsec_checkpcbcache(m, pcbsp, dir);
if (currsp) {
*error = 0;
return currsp;
}
ipsec6stat.spdcachemiss++;
switch (dir) {
case IPSEC_DIR_INBOUND:
currsp = pcbsp->sp_in;
break;
case IPSEC_DIR_OUTBOUND:
currsp = pcbsp->sp_out;
break;
default:
panic("ipsec6_getpolicybypcb: illegal direction.");
}
/* sanity check */
if (currsp == NULL)
panic("ipsec6_getpolicybypcb: currsp is NULL.");
/* when privileged socket */
if (pcbsp->priv) {
switch (currsp->policy) {
case IPSEC_POLICY_BYPASS:
currsp->refcnt++;
*error = 0;
ipsec_fillpcbcache(pcbsp, m, currsp, dir);
return currsp;
case IPSEC_POLICY_ENTRUST:
/* look for a policy in SPD */
if (ipsec_setspidx_mbuf(&spidx, AF_INET6, m, 1) == 0 &&
(kernsp = key_allocsp(tag, &spidx, dir)) != NULL) {
/* SP found */
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec6_getpolicybypcb called "
"to allocate SP:%p\n", kernsp));
*error = 0;
ipsec_fillpcbcache(pcbsp, m, kernsp, dir);
return kernsp;
}
/* no SP found */
ip6_def_policy->refcnt++;
*error = 0;
ipsec_fillpcbcache(pcbsp, m, ip6_def_policy, dir);
return ip6_def_policy;
case IPSEC_POLICY_IPSEC:
currsp->refcnt++;
*error = 0;
ipsec_fillpcbcache(pcbsp, m, currsp, dir);
return currsp;
default:
ipseclog((LOG_ERR, "ipsec6_getpolicybypcb: "
"Invalid policy for PCB %d\n", currsp->policy));
*error = EINVAL;
return NULL;
}
/* NOTREACHED */
}
/* when non-privileged socket */
/* look for a policy in SPD */
if (ipsec_setspidx_mbuf(&spidx, AF_INET6, m, 1) == 0 &&
(kernsp = key_allocsp(tag, &spidx, dir)) != NULL) {
/* SP found */
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec6_getpolicybypcb called "
"to allocate SP:%p\n", kernsp));
*error = 0;
ipsec_fillpcbcache(pcbsp, m, kernsp, dir);
return kernsp;
}
/* no SP found */
switch (currsp->policy) {
case IPSEC_POLICY_BYPASS:
ipseclog((LOG_ERR, "ipsec6_getpolicybypcb: "
"Illegal policy for non-privileged defined %d\n",
currsp->policy));
*error = EINVAL;
return NULL;
case IPSEC_POLICY_ENTRUST:
ip6_def_policy->refcnt++;
*error = 0;
ipsec_fillpcbcache(pcbsp, m, ip6_def_policy, dir);
return ip6_def_policy;
case IPSEC_POLICY_IPSEC:
currsp->refcnt++;
*error = 0;
ipsec_fillpcbcache(pcbsp, m, currsp, dir);
return currsp;
default:
ipseclog((LOG_ERR,
"ipsec6_policybysock: Invalid policy for PCB %d\n",
currsp->policy));
*error = EINVAL;
return NULL;
}
/* NOTREACHED */
}
/*
* For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
* and return a pointer to SP.
* `flag' means that packet is to be forwarded whether or not.
* flag = 1: forwad
* OUT: positive: a pointer to the entry for security policy leaf matched.
* NULL: no apropreate SP found, the following value is set to error.
* 0 : bypass
* EACCES : discard packet.
* ENOENT : ipsec_acquire() in progress, maybe.
* others : error occured.
*/
#ifndef IP_FORWARDING
#define IP_FORWARDING 1
#endif
struct secpolicy *
ipsec6_getpolicybyaddr(m, dir, flag, error)
struct mbuf *m;
u_int dir;
int flag;
int *error;
{
struct secpolicy *sp = NULL;
u_int16_t tag;
/* sanity check */
if (m == NULL || error == NULL)
panic("ipsec6_getpolicybyaddr: NULL pointer was passed.");
/* get a policy entry matched with the packet */
{
struct secpolicyindex spidx;
bzero(&spidx, sizeof(spidx));
/* make an index to look for a policy */
*error = ipsec_setspidx_mbuf(&spidx, AF_INET6, m,
(flag & IP_FORWARDING) ? 0 : 1);
if (*error != 0)
return NULL;
tag = 0;
sp = key_allocsp(tag, &spidx, dir);
}
/* SP found */
if (sp != NULL) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec6_getpolicybyaddr called "
"to allocate SP:%p\n", sp));
*error = 0;
return sp;
}
/* no SP found */
ip6_def_policy->refcnt++;
*error = 0;
return ip6_def_policy;
}
#endif /* INET6 */
/*
* set IP address into spidx from mbuf.
* When Forwarding packet and ICMP echo reply, this function is used.
*
* IN: get the followings from mbuf.
* protocol family, src, dst, next protocol
* OUT:
* 0: success.
* other: failure, and set errno.
*/
int
ipsec_setspidx_mbuf(spidx, family, m, needport)
struct secpolicyindex *spidx;
int family;
struct mbuf *m;
int needport;
{
int error;
/* sanity check */
if (spidx == NULL || m == NULL)
panic("ipsec_setspidx_mbuf: NULL pointer was passed.");
bzero(spidx, sizeof(*spidx));
error = ipsec_setspidx(m, spidx, needport);
if (error)
goto bad;
return 0;
bad:
/* XXX initialize */
bzero(spidx, sizeof(*spidx));
return EINVAL;
}
/*
* configure security policy index (src/dst/proto/sport/dport)
* by looking at the content of mbuf.
* the caller is responsible for error recovery (like clearing up spidx).
*/
static int
ipsec_setspidx(m, spidx, needport)
struct mbuf *m;
struct secpolicyindex *spidx;
int needport;
{
struct ip *ip = NULL;
struct ip ipbuf;
u_int v;
struct mbuf *n;
int len;
int error;
if (m == NULL)
panic("ipsec_setspidx: m == 0 passed.");
bzero(spidx, sizeof(*spidx));
/*
* validate m->m_pkthdr.len. we see incorrect length if we
* mistakenly call this function with inconsistent mbuf chain
* (like 4.4BSD tcp/udp processing). XXX should we panic here?
*/
len = 0;
for (n = m; n; n = n->m_next)
len += n->m_len;
if (m->m_pkthdr.len != len) {
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setspidx: "
"total of m_len(%d) != pkthdr.len(%d), "
"ignored.\n",
len, m->m_pkthdr.len));
return EINVAL;
}
if (m->m_pkthdr.len < sizeof(struct ip)) {
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setspidx: "
"pkthdr.len(%d) < sizeof(struct ip), ignored.\n",
m->m_pkthdr.len));
return EINVAL;
}
if (m->m_len >= sizeof(*ip))
ip = mtod(m, struct ip *);
else {
m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
ip = &ipbuf;
}
#ifdef _IP_VHL
v = _IP_VHL_V(ip->ip_vhl);
#else
v = ip->ip_v;
#endif
switch (v) {
case 4:
error = ipsec4_setspidx_ipaddr(m, spidx);
if (error)
return error;
ipsec4_get_ulp(m, spidx, needport);
return 0;
#ifdef INET6
case 6:
if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setspidx: "
"pkthdr.len(%d) < sizeof(struct ip6_hdr), "
"ignored.\n", m->m_pkthdr.len));
return EINVAL;
}
error = ipsec6_setspidx_ipaddr(m, spidx);
if (error)
return error;
ipsec6_get_ulp(m, spidx, needport);
return 0;
#endif
default:
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setspidx: "
"unknown IP version %u, ignored.\n", v));
return EINVAL;
}
}
static void
ipsec4_get_ulp(m, spidx, needport)
struct mbuf *m;
struct secpolicyindex *spidx;
int needport;
{
struct ip ip;
struct ip6_ext ip6e;
u_int8_t nxt;
int off;
struct tcphdr th;
struct udphdr uh;
/* sanity check */
if (m == NULL)
panic("ipsec4_get_ulp: NULL pointer was passed.");
if (m->m_pkthdr.len < sizeof(ip))
panic("ipsec4_get_ulp: too short");
/* set default */
spidx->ul_proto = IPSEC_ULPROTO_ANY;
((struct sockaddr_in *)&spidx->src)->sin_port = IPSEC_PORT_ANY;
((struct sockaddr_in *)&spidx->dst)->sin_port = IPSEC_PORT_ANY;
m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
/* ip_input() flips it into host endian XXX need more checking */
if (ip.ip_off & (IP_MF | IP_OFFMASK))
return;
nxt = ip.ip_p;
#ifdef _IP_VHL
off = _IP_VHL_HL(ip->ip_vhl) << 2;
#else
off = ip.ip_hl << 2;
#endif
while (off < m->m_pkthdr.len) {
switch (nxt) {
case IPPROTO_TCP:
spidx->ul_proto = nxt;
if (!needport)
return;
if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
return;
m_copydata(m, off, sizeof(th), (caddr_t)&th);
((struct sockaddr_in *)&spidx->src)->sin_port =
th.th_sport;
((struct sockaddr_in *)&spidx->dst)->sin_port =
th.th_dport;
return;
case IPPROTO_UDP:
spidx->ul_proto = nxt;
if (!needport)
return;
if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
return;
m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
((struct sockaddr_in *)&spidx->src)->sin_port =
uh.uh_sport;
((struct sockaddr_in *)&spidx->dst)->sin_port =
uh.uh_dport;
return;
case IPPROTO_AH:
if (off + sizeof(ip6e) > m->m_pkthdr.len)
return;
m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
off += (ip6e.ip6e_len + 2) << 2;
nxt = ip6e.ip6e_nxt;
break;
case IPPROTO_ICMP:
default:
/* XXX intermediate headers??? */
spidx->ul_proto = nxt;
return;
}
}
}
/* assumes that m is sane */
static int
ipsec4_setspidx_ipaddr(m, spidx)
struct mbuf *m;
struct secpolicyindex *spidx;
{
struct ip *ip = NULL;
struct ip ipbuf;
struct sockaddr_in *sin;
if (m->m_len >= sizeof(*ip))
ip = mtod(m, struct ip *);
else {
m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
ip = &ipbuf;
}
sin = (struct sockaddr_in *)&spidx->src;
bzero(sin, sizeof(*sin));
sin->sin_family = AF_INET;
sin->sin_len = sizeof(struct sockaddr_in);
bcopy(&ip->ip_src, &sin->sin_addr, sizeof(ip->ip_src));
spidx->prefs = sizeof(struct in_addr) << 3;
sin = (struct sockaddr_in *)&spidx->dst;
bzero(sin, sizeof(*sin));
sin->sin_family = AF_INET;
sin->sin_len = sizeof(struct sockaddr_in);
bcopy(&ip->ip_dst, &sin->sin_addr, sizeof(ip->ip_dst));
spidx->prefd = sizeof(struct in_addr) << 3;
return 0;
}
#ifdef INET6
static void
ipsec6_get_ulp(m, spidx, needport)
struct mbuf *m;
struct secpolicyindex *spidx;
int needport;
{
int off, nxt;
struct tcphdr th;
struct udphdr uh;
struct icmp6_hdr ih;
/* sanity check */
if (m == NULL)
panic("ipsec6_get_ulp: NULL pointer was passed.");
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m));
/* set default */
spidx->ul_proto = IPSEC_ULPROTO_ANY;
((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
nxt = -1;
off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
if (off < 0 || m->m_pkthdr.len < off)
return;
switch (nxt) {
case IPPROTO_TCP:
spidx->ul_proto = nxt;
if (!needport)
break;
if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
break;
m_copydata(m, off, sizeof(th), (caddr_t)&th);
((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
break;
case IPPROTO_UDP:
spidx->ul_proto = nxt;
if (!needport)
break;
if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
break;
m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
break;
case IPPROTO_ICMPV6:
spidx->ul_proto = nxt;
if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len)
break;
m_copydata(m, off, sizeof(ih), (caddr_t)&ih);
((struct sockaddr_in6 *)&spidx->src)->sin6_port =
htons((u_int16_t)ih.icmp6_type);
((struct sockaddr_in6 *)&spidx->dst)->sin6_port =
htons((u_int16_t)ih.icmp6_code);
break;
default:
/* XXX intermediate headers??? */
spidx->ul_proto = nxt;
break;
}
}
/* assumes that m is sane */
static int
ipsec6_setspidx_ipaddr(m, spidx)
struct mbuf *m;
struct secpolicyindex *spidx;
{
struct ip6_hdr *ip6 = NULL;
struct ip6_hdr ip6buf;
struct sockaddr_in6 *sin6;
if (m->m_len >= sizeof(*ip6))
ip6 = mtod(m, struct ip6_hdr *);
else {
m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
ip6 = &ip6buf;
}
sin6 = (struct sockaddr_in6 *)&spidx->src;
bzero(sin6, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(struct sockaddr_in6);
in6_recoverscope(sin6, &ip6->ip6_src, NULL);
spidx->prefs = sizeof(struct in6_addr) << 3;
sin6 = (struct sockaddr_in6 *)&spidx->dst;
bzero(sin6, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(struct sockaddr_in6);
in6_recoverscope(sin6, &ip6->ip6_dst, NULL);
spidx->prefd = sizeof(struct in6_addr) << 3;
return 0;
}
#endif
static struct inpcbpolicy *
ipsec_newpcbpolicy()
{
struct inpcbpolicy *p;
p = (struct inpcbpolicy *)malloc(sizeof(*p), M_SECA, M_NOWAIT);
return p;
}
static void
ipsec_delpcbpolicy(p)
struct inpcbpolicy *p;
{
free(p, M_SECA);
}
/* initialize policy in PCB */
int
ipsec_init_pcbpolicy(so, pcb_sp)
struct socket *so;
struct inpcbpolicy **pcb_sp;
{
struct inpcbpolicy *new;
static int initialized = 0;
static struct secpolicy *in = NULL, *out = NULL;
/* sanity check. */
if (so == NULL || pcb_sp == NULL)
panic("ipsec_init_pcbpolicy: NULL pointer was passed.");
if (!initialized) {
if ((in = key_newsp(0)) == NULL)
return ENOBUFS;
if ((out = key_newsp(0)) == NULL) {
key_freesp(in);
in = NULL;
return ENOBUFS;
}
in->state = IPSEC_SPSTATE_ALIVE;
in->policy = IPSEC_POLICY_ENTRUST;
in->dir = IPSEC_DIR_INBOUND;
in->readonly = 1;
in->persist = 1;
in->so = NULL;
out->state = IPSEC_SPSTATE_ALIVE;
out->policy = IPSEC_POLICY_ENTRUST;
out->dir = IPSEC_DIR_OUTBOUND;
out->readonly = 1;
out->persist = 1;
out->so = NULL;
initialized++;
}
new = ipsec_newpcbpolicy();
if (new == NULL) {
ipseclog((LOG_DEBUG, "ipsec_init_pcbpolicy: No more memory.\n"));
return ENOBUFS;
}
bzero(new, sizeof(*new));
if (so->so_cred != 0 && so->so_cred->cr_uid == 0)
new->priv = 1;
else
new->priv = 0;
new->sp_in = in;
new->sp_in->refcnt++;
new->sp_out = out;
new->sp_out->refcnt++;
*pcb_sp = new;
return 0;
}
/* copy old ipsec policy into new */
int
ipsec_copy_pcbpolicy(old, new)
struct inpcbpolicy *old, *new;
{
if (new->sp_in)
key_freesp(new->sp_in);
if (old->sp_in->policy == IPSEC_POLICY_IPSEC)
new->sp_in = ipsec_deepcopy_policy(old->sp_in);
else {
new->sp_in = old->sp_in;
new->sp_in->refcnt++;
}
if (new->sp_out)
key_freesp(new->sp_out);
if (old->sp_out->policy == IPSEC_POLICY_IPSEC)
new->sp_out = ipsec_deepcopy_policy(old->sp_out);
else {
new->sp_out = old->sp_out;
new->sp_out->refcnt++;
}
new->priv = old->priv;
return 0;
}
#if 0
static int
ipsec_deepcopy_pcbpolicy(pcb_sp)
struct inpcbpolicy *pcb_sp;
{
struct secpolicy *sp;
sp = ipsec_deepcopy_policy(pcb_sp->sp_in);
if (sp) {
key_freesp(pcb_sp->sp_in);
pcb_sp->sp_in = sp;
} else
return ENOBUFS;
sp = ipsec_deepcopy_policy(pcb_sp->sp_out);
if (sp) {
key_freesp(pcb_sp->sp_out);
pcb_sp->sp_out = sp;
} else
return ENOBUFS;
return 0;
}
#endif
/* deep-copy a policy in PCB */
static struct secpolicy *
ipsec_deepcopy_policy(src)
struct secpolicy *src;
{
struct ipsecrequest *newchain = NULL;
struct ipsecrequest *p;
struct ipsecrequest **q;
struct ipsecrequest *r;
struct secpolicy *dst;
if (src == NULL)
return NULL;
dst = key_newsp(0);
if (dst == NULL)
return NULL;
/*
* deep-copy IPsec request chain. This is required since struct
* ipsecrequest is not reference counted.
*/
q = &newchain;
for (p = src->req; p; p = p->next) {
*q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest),
M_SECA, M_NOWAIT);
if (*q == NULL)
goto fail;
bzero(*q, sizeof(**q));
(*q)->next = NULL;
(*q)->saidx.proto = p->saidx.proto;
(*q)->saidx.mode = p->saidx.mode;
(*q)->level = p->level;
(*q)->saidx.reqid = p->saidx.reqid;
bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
(*q)->sav = NULL;
(*q)->sp = dst;
q = &((*q)->next);
}
if (src->spidx)
if (keydb_setsecpolicyindex(dst, src->spidx) != 0)
goto fail;
dst->req = newchain;
dst->state = src->state;
dst->policy = src->policy;
dst->dir = src->dir;
dst->so = src->so;
/* do not touch the refcnt fields */
return dst;
fail:
for (p = newchain; p; p = r) {
r = p->next;
free(p, M_SECA);
p = NULL;
}
key_freesp(dst);
return NULL;
}
/* set policy and ipsec request if present. */
static int
ipsec_set_policy(spp, optname, request, len, priv)
struct secpolicy **spp;
int optname;
caddr_t request;
size_t len;
int priv;
{
struct sadb_x_policy *xpl;
struct secpolicy *newsp = NULL;
int error;
/* sanity check. */
if (spp == NULL || *spp == NULL || request == NULL)
return EINVAL;
if (len < sizeof(*xpl))
return EINVAL;
xpl = (struct sadb_x_policy *)request;
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_set_policy: passed policy\n");
kdebug_sadb_x_policy((struct sadb_ext *)xpl));
/* check policy type */
/* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD ||
xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
return EINVAL;
/* check privileged socket */
if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
return EACCES;
/* allocation new SP entry */
if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
return error;
newsp->state = IPSEC_SPSTATE_ALIVE;
/* clear old SP and set new SP */
key_freesp(*spp);
*spp = newsp;
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_set_policy: new policy\n");
kdebug_secpolicy(newsp));
return 0;
}
static int
ipsec_get_policy(sp, mp)
struct secpolicy *sp;
struct mbuf **mp;
{
/* sanity check. */
if (sp == NULL || mp == NULL)
return EINVAL;
*mp = key_sp2msg(sp);
if (!*mp) {
ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n"));
return ENOBUFS;
}
(*mp)->m_type = MT_DATA;
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_get_policy:\n");
kdebug_mbuf(*mp));
return 0;
}
int
ipsec4_set_policy(inp, optname, request, len, priv)
struct inpcb *inp;
int optname;
caddr_t request;
size_t len;
int priv;
{
struct sadb_x_policy *xpl;
struct secpolicy **spp;
/* sanity check. */
if (inp == NULL || request == NULL)
return EINVAL;
if (len < sizeof(*xpl))
return EINVAL;
xpl = (struct sadb_x_policy *)request;
/* select direction */
switch (xpl->sadb_x_policy_dir) {
case IPSEC_DIR_INBOUND:
spp = &inp->inp_sp->sp_in;
break;
case IPSEC_DIR_OUTBOUND:
spp = &inp->inp_sp->sp_out;
break;
default:
ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
xpl->sadb_x_policy_dir));
return EINVAL;
}
ipsec_invalpcbcache(inp->inp_sp, IPSEC_DIR_ANY);
return ipsec_set_policy(spp, optname, request, len, priv);
}
int
ipsec4_get_policy(inp, request, len, mp)
struct inpcb *inp;
caddr_t request;
size_t len;
struct mbuf **mp;
{
struct sadb_x_policy *xpl;
struct secpolicy *sp;
/* sanity check. */
if (inp == NULL || request == NULL || mp == NULL)
return EINVAL;
if (inp->inp_sp == NULL)
panic("policy in PCB is NULL");
if (len < sizeof(*xpl))
return EINVAL;
xpl = (struct sadb_x_policy *)request;
/* select direction */
switch (xpl->sadb_x_policy_dir) {
case IPSEC_DIR_INBOUND:
sp = inp->inp_sp->sp_in;
break;
case IPSEC_DIR_OUTBOUND:
sp = inp->inp_sp->sp_out;
break;
default:
ipseclog((LOG_ERR, "ipsec4_get_policy: invalid direction=%u\n",
xpl->sadb_x_policy_dir));
return EINVAL;
}
return ipsec_get_policy(sp, mp);
}
/* delete policy in PCB */
int
ipsec4_delete_pcbpolicy(inp)
struct inpcb *inp;
{
/* sanity check. */
if (inp == NULL)
panic("ipsec4_delete_pcbpolicy: NULL pointer was passed.");
if (inp->inp_sp == NULL)
return 0;
if (inp->inp_sp->sp_in != NULL) {
key_freesp(inp->inp_sp->sp_in);
inp->inp_sp->sp_in = NULL;
}
if (inp->inp_sp->sp_out != NULL) {
key_freesp(inp->inp_sp->sp_out);
inp->inp_sp->sp_out = NULL;
}
ipsec_invalpcbcache(inp->inp_sp, IPSEC_DIR_ANY);
ipsec_delpcbpolicy(inp->inp_sp);
inp->inp_sp = NULL;
return 0;
}
#ifdef INET6
int
ipsec6_set_policy(in6p, optname, request, len, priv)
struct in6pcb *in6p;
int optname;
caddr_t request;
size_t len;
int priv;
{
struct sadb_x_policy *xpl;
struct secpolicy **spp;
/* sanity check. */
if (in6p == NULL || request == NULL)
return EINVAL;
if (len < sizeof(*xpl))
return EINVAL;
xpl = (struct sadb_x_policy *)request;
/* select direction */
switch (xpl->sadb_x_policy_dir) {
case IPSEC_DIR_INBOUND:
spp = &in6p->in6p_sp->sp_in;
break;
case IPSEC_DIR_OUTBOUND:
spp = &in6p->in6p_sp->sp_out;
break;
default:
ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
xpl->sadb_x_policy_dir));
return EINVAL;
}
ipsec_invalpcbcache(in6p->in6p_sp, IPSEC_DIR_ANY);
return ipsec_set_policy(spp, optname, request, len, priv);
}
int
ipsec6_get_policy(in6p, request, len, mp)
struct in6pcb *in6p;
caddr_t request;
size_t len;
struct mbuf **mp;
{
struct sadb_x_policy *xpl;
struct secpolicy *sp;
/* sanity check. */
if (in6p == NULL || request == NULL || mp == NULL)
return EINVAL;
if (in6p->in6p_sp == NULL)
panic("policy in PCB is NULL");
if (len < sizeof(*xpl))
return EINVAL;
xpl = (struct sadb_x_policy *)request;
/* select direction */
switch (xpl->sadb_x_policy_dir) {
case IPSEC_DIR_INBOUND:
sp = in6p->in6p_sp->sp_in;
break;
case IPSEC_DIR_OUTBOUND:
sp = in6p->in6p_sp->sp_out;
break;
default:
ipseclog((LOG_ERR, "ipsec6_get_policy: invalid direction=%u\n",
xpl->sadb_x_policy_dir));
return EINVAL;
}
return ipsec_get_policy(sp, mp);
}
int
ipsec6_delete_pcbpolicy(in6p)
struct in6pcb *in6p;
{
/* sanity check. */
if (in6p == NULL)
panic("ipsec6_delete_pcbpolicy: NULL pointer was passed.");
if (in6p->in6p_sp == NULL)
return 0;
if (in6p->in6p_sp->sp_in != NULL) {
key_freesp(in6p->in6p_sp->sp_in);
in6p->in6p_sp->sp_in = NULL;
}
if (in6p->in6p_sp->sp_out != NULL) {
key_freesp(in6p->in6p_sp->sp_out);
in6p->in6p_sp->sp_out = NULL;
}
ipsec_invalpcbcache(in6p->in6p_sp, IPSEC_DIR_ANY);
ipsec_delpcbpolicy(in6p->in6p_sp);
in6p->in6p_sp = NULL;
return 0;
}
#endif
/*
* return current level.
* Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
*/
u_int
ipsec_get_reqlevel(isr, af)
struct ipsecrequest *isr;
int af;
{
u_int level = 0;
u_int esp_trans_deflev, esp_net_deflev, ah_trans_deflev, ah_net_deflev;
/* sanity check */
if (isr == NULL || isr->sp == NULL)
panic("ipsec_get_reqlevel: NULL pointer is passed.");
/* set default level */
switch (af) {
#ifdef INET
case AF_INET:
esp_trans_deflev = ip4_esp_trans_deflev;
esp_net_deflev = ip4_esp_net_deflev;
ah_trans_deflev = ip4_ah_trans_deflev;
ah_net_deflev = ip4_ah_net_deflev;
break;
#endif
#ifdef INET6
case AF_INET6:
esp_trans_deflev = ip6_esp_trans_deflev;
esp_net_deflev = ip6_esp_net_deflev;
ah_trans_deflev = ip6_ah_trans_deflev;
ah_net_deflev = ip6_ah_net_deflev;
break;
#endif /* INET6 */
default:
panic("key_get_reqlevel: Unknown family. %d",
((struct sockaddr *)&isr->sp->spidx->src)->sa_family);
}
/* set level */
switch (isr->level) {
case IPSEC_LEVEL_DEFAULT:
switch (isr->saidx.proto) {
case IPPROTO_ESP:
if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
level = esp_net_deflev;
else
level = esp_trans_deflev;
break;
case IPPROTO_AH:
if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
level = ah_net_deflev;
else
level = ah_trans_deflev;
break;
case IPPROTO_IPCOMP:
/*
* we don't really care, as IPcomp document says that
* we shouldn't compress small packets
*/
level = IPSEC_LEVEL_USE;
break;
default:
panic("ipsec_get_reqlevel: "
"Illegal protocol defined %u\n",
isr->saidx.proto);
}
break;
case IPSEC_LEVEL_USE:
case IPSEC_LEVEL_REQUIRE:
level = isr->level;
break;
case IPSEC_LEVEL_UNIQUE:
level = IPSEC_LEVEL_REQUIRE;
break;
default:
panic("ipsec_get_reqlevel: Illegal IPsec level %u",
isr->level);
}
return level;
}
/*
* Check AH/ESP integrity.
* OUT:
* 0: valid
* 1: invalid
*/
static int
ipsec_in_reject(sp, m)
struct secpolicy *sp;
struct mbuf *m;
{
struct ipsecrequest *isr;
u_int level;
int need_auth, need_conf, need_icv;
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("ipsec_in_reject: using SP\n");
kdebug_secpolicy(sp));
/* check policy */
switch (sp->policy) {
case IPSEC_POLICY_DISCARD:
return 1;
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
return 0;
case IPSEC_POLICY_IPSEC:
break;
case IPSEC_POLICY_ENTRUST:
default:
panic("ipsec_in_reject: Invalid policy found. %d", sp->policy);
}
need_auth = 0;
need_conf = 0;
need_icv = 0;
/* XXX should compare policy against ipsec header history */
for (isr = sp->req; isr != NULL; isr = isr->next) {
/* get current level */
level = ipsec_get_reqlevel(isr, AF_INET);
switch (isr->saidx.proto) {
case IPPROTO_ESP:
if (level == IPSEC_LEVEL_REQUIRE) {
need_conf++;
if (isr->sav != NULL
&& isr->sav->flags == SADB_X_EXT_NONE
&& isr->sav->alg_auth != SADB_AALG_NONE)
need_icv++;
}
break;
case IPPROTO_AH:
if (level == IPSEC_LEVEL_REQUIRE) {
need_auth++;
need_icv++;
}
break;
case IPPROTO_IPCOMP:
/*
* we don't really care, as IPcomp document says that
* we shouldn't compress small packets, IPComp policy
* should always be treated as being in "use" level.
*/
break;
}
}
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_in_reject: auth:%d conf:%d icv:%d m_flags:%x\n",
need_auth, need_conf, need_icv, m->m_flags));
if ((need_conf && !(m->m_flags & M_DECRYPTED))
|| (!need_auth && need_icv && !(m->m_flags & M_AUTHIPDGM))
|| (need_auth && !(m->m_flags & M_AUTHIPHDR)))
return 1;
return 0;
}
/*
* Check AH/ESP integrity.
* This function is called from tcp_input(), udp_input(),
* and {ah,esp}4_input for tunnel mode
*/
int
ipsec4_in_reject(m, inp)
struct mbuf *m;
struct inpcb *inp;
{
struct secpolicy *sp = NULL;
int error;
int result;
/* sanity check */
if (m == NULL)
return 0; /* XXX should be panic ? */
/* get SP for this packet.
* When we are called from ip_forward(), we call
* ipsec4_getpolicybyaddr() with IP_FORWARDING flag.
*/
if (inp == NULL)
sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
IP_FORWARDING, &error);
else
sp = ipsec4_getpolicybypcb(m, IPSEC_DIR_INBOUND, inp, &error);
/* XXX should be panic ? -> No, there may be error. */
if (sp == NULL)
return 0;
result = ipsec_in_reject(sp, m);
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec4_in_reject call free SP:%p\n", sp));
key_freesp(sp);
return result;
}
#ifdef INET6
/*
* Check AH/ESP integrity.
* This function is called from tcp6_input(), udp6_input(),
* and {ah,esp}6_input for tunnel mode
*/
int
ipsec6_in_reject(m, in6p)
struct mbuf *m;
struct in6pcb *in6p;
{
struct secpolicy *sp = NULL;
int error;
int result;
/* sanity check */
if (m == NULL)
return 0; /* XXX should be panic ? */
/* get SP for this packet.
* When we are called from ip_forward(), we call
* ipsec6_getpolicybyaddr() with IP_FORWARDING flag.
*/
if (in6p == NULL)
sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
IP_FORWARDING, &error);
else
sp = ipsec6_getpolicybypcb(m, IPSEC_DIR_INBOUND, in6p, &error);
if (sp == NULL)
return 0; /* XXX should be panic ? */
result = ipsec_in_reject(sp, m);
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec6_in_reject call free SP:%p\n", sp));
key_freesp(sp);
return result;
}
#endif
/*
* compute the byte size to be occupied by IPsec header.
* in case it is tunneled, it includes the size of outer IP header.
* NOTE: SP passed is free in this function.
*/
static size_t
ipsec_hdrsiz(sp)
struct secpolicy *sp;
{
struct ipsecrequest *isr;
size_t siz, clen;
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("ipsec_hdrsiz: using SP\n");
kdebug_secpolicy(sp));
/* check policy */
switch (sp->policy) {
case IPSEC_POLICY_DISCARD:
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
return 0;
case IPSEC_POLICY_IPSEC:
break;
case IPSEC_POLICY_ENTRUST:
default:
panic("ipsec_hdrsiz: Invalid policy found. %d", sp->policy);
}
siz = 0;
for (isr = sp->req; isr != NULL; isr = isr->next) {
clen = 0;
switch (isr->saidx.proto) {
case IPPROTO_ESP:
#ifdef IPSEC_ESP
clen = esp_hdrsiz(isr);
#else
clen = 0; /* XXX */
#endif
break;
case IPPROTO_AH:
clen = ah_hdrsiz(isr);
break;
case IPPROTO_IPCOMP:
clen = sizeof(struct ipcomp);
break;
}
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
switch (((struct sockaddr *)&isr->saidx.dst)->sa_family) {
case AF_INET:
clen += sizeof(struct ip);
break;
#ifdef INET6
case AF_INET6:
clen += sizeof(struct ip6_hdr);
break;
#endif
default:
ipseclog((LOG_ERR, "ipsec_hdrsiz: "
"unknown AF %d in IPsec tunnel SA\n",
((struct sockaddr *)&isr->saidx.dst)->sa_family));
break;
}
}
siz += clen;
}
return siz;
}
/* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
size_t
ipsec4_hdrsiz(m, dir, inp)
struct mbuf *m;
u_int dir;
struct inpcb *inp;
{
struct secpolicy *sp = NULL;
int error;
size_t size;
/* sanity check */
if (m == NULL)
return 0; /* XXX should be panic ? */
#if 0
/* this is possible in TIME_WAIT state */
if (inp != NULL && inp->inp_socket == NULL)
panic("ipsec4_hdrsize: why is socket NULL but there is PCB.");
#endif
/* get SP for this packet.
* When we are called from ip_forward(), we call
* ipsec4_getpolicybyaddr() with IP_FORWARDING flag.
*/
if (inp == NULL)
sp = ipsec4_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
else
sp = ipsec4_getpolicybypcb(m, dir, inp, &error);
if (sp == NULL)
return 0; /* XXX should be panic ? */
size = ipsec_hdrsiz(sp);
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec4_hdrsiz call free SP:%p\n", sp));
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("ipsec4_hdrsiz: size:%lu.\n", (unsigned long)size));
key_freesp(sp);
return size;
}
#ifdef INET6
/* This function is called from ipsec6_hdrsize_tcp(),
* and maybe from ip6_forward.()
*/
size_t
ipsec6_hdrsiz(m, dir, in6p)
struct mbuf *m;
u_int dir;
struct in6pcb *in6p;
{
struct secpolicy *sp = NULL;
int error;
size_t size;
/* sanity check */
if (m == NULL)
return 0; /* XXX should be panic ? */
#if 0
/* this is possible in TIME_WAIT state */
if (in6p != NULL && in6p->in6p_socket == NULL)
panic("ipsec6_hdrsize: why is socket NULL but there is PCB.");
#endif
/* get SP for this packet */
/* XXX Is it right to call with IP_FORWARDING. */
if (in6p == NULL)
sp = ipsec6_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
else
sp = ipsec6_getpolicybypcb(m, dir, in6p, &error);
if (sp == NULL)
return 0;
size = ipsec_hdrsiz(sp);
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec6_hdrsiz call free SP:%p\n", sp));
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size));
key_freesp(sp);
return size;
}
#endif /* INET6 */
#ifdef INET
/*
* encapsulate for ipsec tunnel.
* ip->ip_src must be fixed later on.
*/
static int
ipsec4_encapsulate(m, sav)
struct mbuf *m;
struct secasvar *sav;
{
struct ip *oip;
struct ip *ip;
size_t hlen;
size_t plen;
/* can't tunnel between different AFs */
if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family
!= ((struct sockaddr *)&sav->sah->saidx.dst)->sa_family
|| ((struct sockaddr *)&sav->sah->saidx.src)->sa_family != AF_INET) {
m_freem(m);
return EINVAL;
}
#if 0
/* XXX if the dst is myself, perform nothing. */
if (key_ismyaddr((struct sockaddr *)&sav->sah->saidx.dst)) {
m_freem(m);
return EINVAL;
}
#endif
if (m->m_len < sizeof(*ip))
panic("ipsec4_encapsulate: assumption failed (first mbuf length)");
ip = mtod(m, struct ip *);
#ifdef _IP_VHL
hlen = _IP_VHL_HL(ip->ip_vhl) << 2;
#else
hlen = ip->ip_hl << 2;
#endif
if (m->m_len != hlen)
panic("ipsec4_encapsulate: assumption failed (first mbuf length)");
/* generate header checksum */
ip->ip_sum = 0;
#ifdef _IP_VHL
if (ip->ip_vhl == IP_VHL_BORING)
ip->ip_sum = in_cksum_hdr(ip);
else
ip->ip_sum = in_cksum(m, hlen);
#else
ip->ip_sum = in_cksum(m, hlen);
#endif
plen = m->m_pkthdr.len;
/*
* grow the mbuf to accomodate the new IPv4 header.
* NOTE: IPv4 options will never be copied.
*/
if (M_LEADINGSPACE(m->m_next) < hlen) {
struct mbuf *n;
MGET(n, M_DONTWAIT, MT_DATA);
if (!n) {
m_freem(m);
return ENOBUFS;
}
n->m_len = hlen;
n->m_next = m->m_next;
m->m_next = n;
m->m_pkthdr.len += hlen;
oip = mtod(n, struct ip *);
} else {
m->m_next->m_len += hlen;
m->m_next->m_data -= hlen;
m->m_pkthdr.len += hlen;
oip = mtod(m->m_next, struct ip *);
}
ip = mtod(m, struct ip *);
ovbcopy((caddr_t)ip, (caddr_t)oip, hlen);
m->m_len = sizeof(struct ip);
m->m_pkthdr.len -= (hlen - sizeof(struct ip));
/* construct new IPv4 header. see RFC 2401 5.1.2.1 */
/* ECN consideration. */
ip_ecn_ingress(ip4_ipsec_ecn, &ip->ip_tos, &oip->ip_tos);
#ifdef _IP_VHL
ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2);
#else
ip->ip_hl = sizeof(struct ip) >> 2;
#endif
ip->ip_off &= htons(~IP_OFFMASK);
ip->ip_off &= htons(~IP_MF);
switch (ip4_ipsec_dfbit) {
case 0: /* clear DF bit */
ip->ip_off &= htons(~IP_DF);
break;
case 1: /* set DF bit */
ip->ip_off |= htons(IP_DF);
break;
default: /* copy DF bit */
break;
}
ip->ip_p = IPPROTO_IPIP;
if (plen + sizeof(struct ip) < IP_MAXPACKET)
ip->ip_len = htons(plen + sizeof(struct ip));
else {
ipseclog((LOG_ERR, "IPv4 ipsec: size exceeds limit: "
"leave ip_len as is (invalid packet)\n"));
}
ip->ip_id = ip_newid();
bcopy(&((struct sockaddr_in *)&sav->sah->saidx.src)->sin_addr,
&ip->ip_src, sizeof(ip->ip_src));
bcopy(&((struct sockaddr_in *)&sav->sah->saidx.dst)->sin_addr,
&ip->ip_dst, sizeof(ip->ip_dst));
ip->ip_ttl = IPDEFTTL;
/* XXX Should ip_src be updated later ? */
return 0;
}
#endif /* INET */
#ifdef INET6
static int
ipsec6_encapsulate(m, sav)
struct mbuf *m;
struct secasvar *sav;
{
struct ip6_hdr *oip6;
struct ip6_hdr *ip6;
size_t plen;
/* can't tunnel between different AFs */
if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family
!= ((struct sockaddr *)&sav->sah->saidx.dst)->sa_family
|| ((struct sockaddr *)&sav->sah->saidx.src)->sa_family != AF_INET6) {
m_freem(m);
return EINVAL;
}
#if 0
/* XXX if the dst is myself, perform nothing. */
if (key_ismyaddr((struct sockaddr *)&sav->sah->saidx.dst)) {
m_freem(m);
return EINVAL;
}
#endif
plen = m->m_pkthdr.len;
/*
* grow the mbuf to accomodate the new IPv6 header.
*/
if (m->m_len != sizeof(struct ip6_hdr))
panic("ipsec6_encapsulate: assumption failed (first mbuf length)");
if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
struct mbuf *n;
MGET(n, M_DONTWAIT, MT_DATA);
if (!n) {
m_freem(m);
return ENOBUFS;
}
n->m_len = sizeof(struct ip6_hdr);
n->m_next = m->m_next;
m->m_next = n;
m->m_pkthdr.len += sizeof(struct ip6_hdr);
oip6 = mtod(n, struct ip6_hdr *);
} else {
m->m_next->m_len += sizeof(struct ip6_hdr);
m->m_next->m_data -= sizeof(struct ip6_hdr);
m->m_pkthdr.len += sizeof(struct ip6_hdr);
oip6 = mtod(m->m_next, struct ip6_hdr *);
}
ip6 = mtod(m, struct ip6_hdr *);
ovbcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
/* XXX: Fake scoped addresses */
in6_clearscope(&oip6->ip6_src);
in6_clearscope(&oip6->ip6_dst);
/* construct new IPv6 header. see RFC 2401 5.1.2.2 */
/* ECN consideration. */
ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
ip6->ip6_plen = htons(plen);
else {
/* ip6->ip6_plen will be updated in ip6_output() */
}
ip6->ip6_nxt = IPPROTO_IPV6;
in6_embedscope(&ip6->ip6_src,
(struct sockaddr_in6 *)&sav->sah->saidx.src, NULL, NULL);
in6_embedscope(&ip6->ip6_dst,
(struct sockaddr_in6 *)&sav->sah->saidx.dst, NULL, NULL);
ip6->ip6_hlim = IPV6_DEFHLIM;
/* XXX Should ip6_src be updated later ? */
return 0;
}
#endif /* INET6 */
/*
* Check the variable replay window.
* ipsec_chkreplay() performs replay check before ICV verification.
* ipsec_updatereplay() updates replay bitmap. This must be called after
* ICV verification (it also performs replay check, which is usually done
* beforehand).
* 0 (zero) is returned if packet disallowed, 1 if packet permitted.
*
* based on RFC 2401.
*
* XXX need to update for 64bit sequence number - 2401bis
*/
int
ipsec_chkreplay(seq, sav)
u_int32_t seq;
struct secasvar *sav;
{
const struct secreplay *replay;
u_int32_t diff;
int fr;
u_int32_t wsizeb; /* constant: bits of window size */
int frlast; /* constant: last frame */
/* sanity check */
if (sav == NULL)
panic("ipsec_chkreplay: NULL pointer was passed.");
replay = sav->replay;
if (replay->wsize == 0)
return 1; /* no need to check replay. */
/* constant */
frlast = replay->wsize - 1;
wsizeb = replay->wsize << 3;
/* sequence number of 0 is invalid */
if (seq == 0)
return 0;
/* first time is always okay */
if (replay->count == 0)
return 1;
if (seq > replay->lastseq) {
/* larger sequences are okay */
return 1;
} else {
/* seq is equal or less than lastseq. */
diff = replay->lastseq - seq;
/* over range to check, i.e. too old or wrapped */
if (diff >= wsizeb)
return 0;
fr = frlast - diff / 8;
/* this packet already seen ? */
if (replay->bitmap[fr] & (1 << (diff % 8)))
return 0;
/* out of order but good */
return 1;
}
}
/*
* check replay counter whether to update or not.
* OUT: 0: OK
* 1: NG
* XXX need to update for 64bit sequence number - 2401bis
*/
int
ipsec_updatereplay(seq, sav)
u_int32_t seq;
struct secasvar *sav;
{
struct secreplay *replay;
u_int64_t diff;
int fr;
u_int32_t wsizeb; /* constant: bits of window size */
int frlast; /* constant: last frame */
/* sanity check */
if (sav == NULL)
panic("ipsec_chkreplay: NULL pointer was passed.");
replay = sav->replay;
if (replay->wsize == 0)
goto ok; /* no need to check replay. */
/* constant */
frlast = replay->wsize - 1;
wsizeb = replay->wsize << 3;
/* sequence number of 0 is invalid */
if (seq == 0)
return 1;
/* first time */
if (replay->count == 0) {
replay->lastseq = seq;
bzero(replay->bitmap, replay->wsize);
replay->bitmap[frlast] = 1;
goto ok;
}
if (seq > replay->lastseq) {
/* seq is larger than lastseq. */
diff = seq - replay->lastseq;
/* new larger sequence number */
if (diff < wsizeb) {
/* In window */
/* set bit for this packet */
vshiftl(replay->bitmap, diff, replay->wsize);
replay->bitmap[frlast] |= 1;
} else {
/* this packet has a "way larger" */
bzero(replay->bitmap, replay->wsize);
replay->bitmap[frlast] = 1;
}
replay->lastseq = seq;
/* larger is good */
} else {
/* seq is equal or less than lastseq. */
diff = replay->lastseq - seq;
/* over range to check, i.e. too old or wrapped */
if (diff >= wsizeb)
return 1;
fr = frlast - diff / 8;
/* this packet already seen ? */
if (replay->bitmap[fr] & (1 << (diff % 8)))
return 1;
/* mark as seen */
replay->bitmap[fr] |= (1 << (diff % 8));
/* out of order but good */
}
ok:
if (replay->count == 0xffffffff) {
/* set overflow flag */
replay->overflow++;
/* don't increment, no more packets accepted */
if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
return 1;
ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n",
replay->overflow, ipsec_logsastr(sav)));
}
replay->count++;
return 0;
}
/*
* shift variable length buffer to left.
* IN: bitmap: pointer to the buffer
* nbit: the number of to shift.
* wsize: buffer size (bytes).
*/
static void
vshiftl(bitmap, nbit, wsize)
unsigned char *bitmap;
int nbit, wsize;
{
int s, j, i;
unsigned char over;
for (j = 0; j < nbit; j += 8) {
s = (nbit - j < 8) ? (nbit - j): 8;
bitmap[0] <<= s;
for (i = 1; i < wsize; i++) {
over = (bitmap[i] >> (8 - s));
bitmap[i] <<= s;
bitmap[i - 1] |= over;
}
}
return;
}
const char *
ipsec4_logpacketstr(ip, spi)
struct ip *ip;
u_int32_t spi;
{
static char buf[256];
char *p;
u_int8_t *s, *d;
s = (u_int8_t *)(&ip->ip_src);
d = (u_int8_t *)(&ip->ip_dst);
p = buf;
snprintf(buf, sizeof(buf), "packet(SPI=%u ", (u_int32_t)ntohl(spi));
while (*p)
p++;
snprintf(p, sizeof(buf) - (p - buf), "src=%u.%u.%u.%u",
s[0], s[1], s[2], s[3]);
while (*p)
p++;
snprintf(p, sizeof(buf) - (p - buf), " dst=%u.%u.%u.%u",
d[0], d[1], d[2], d[3]);
while (*p)
p++;
snprintf(p, sizeof(buf) - (p - buf), ")");
return buf;
}
#ifdef INET6
const char *
ipsec6_logpacketstr(ip6, spi)
struct ip6_hdr *ip6;
u_int32_t spi;
{
static char buf[256];
char *p;
p = buf;
snprintf(buf, sizeof(buf), "packet(SPI=%u ", (u_int32_t)ntohl(spi));
while (*p)
p++;
snprintf(p, sizeof(buf) - (p - buf), "src=%s",
ip6_sprintf(&ip6->ip6_src));
while (*p)
p++;
snprintf(p, sizeof(buf) - (p - buf), " dst=%s",
ip6_sprintf(&ip6->ip6_dst));
while (*p)
p++;
snprintf(p, sizeof(buf) - (p - buf), ")");
return buf;
}
#endif /* INET6 */
const char *
ipsec_logsastr(sav)
struct secasvar *sav;
{
static char buf[256];
char *p;
struct secasindex *saidx = &sav->sah->saidx;
/* validity check */
if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family
!= ((struct sockaddr *)&sav->sah->saidx.dst)->sa_family)
panic("ipsec_logsastr: family mismatched.");
p = buf;
snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
while (*p)
p++;
if (((struct sockaddr *)&saidx->src)->sa_family == AF_INET) {
u_int8_t *s, *d;
s = (u_int8_t *)&((struct sockaddr_in *)&saidx->src)->sin_addr;
d = (u_int8_t *)&((struct sockaddr_in *)&saidx->dst)->sin_addr;
snprintf(p, sizeof(buf) - (p - buf),
"src=%d.%d.%d.%d dst=%d.%d.%d.%d",
s[0], s[1], s[2], s[3], d[0], d[1], d[2], d[3]);
}
#ifdef INET6
else if (((struct sockaddr *)&saidx->src)->sa_family == AF_INET6) {
snprintf(p, sizeof(buf) - (p - buf),
"src=%s",
ip6_sprintf(&((struct sockaddr_in6 *)&saidx->src)->sin6_addr));
while (*p)
p++;
snprintf(p, sizeof(buf) - (p - buf),
" dst=%s",
ip6_sprintf(&((struct sockaddr_in6 *)&saidx->dst)->sin6_addr));
}
#endif
while (*p)
p++;
snprintf(p, sizeof(buf) - (p - buf), ")");
return buf;
}
void
ipsec_dumpmbuf(m)
struct mbuf *m;
{
int totlen;
int i;
u_char *p;
totlen = 0;
printf("---\n");
while (m) {
p = mtod(m, u_char *);
for (i = 0; i < m->m_len; i++) {
printf("%02x ", p[i]);
totlen++;
if (totlen % 16 == 0)
printf("\n");
}
m = m->m_next;
}
if (totlen % 16 != 0)
printf("\n");
printf("---\n");
}
#ifdef INET
static int
ipsec4_checksa(isr, state)
struct ipsecrequest *isr;
struct ipsec_output_state *state;
{
struct ip *ip;
struct secasindex saidx;
struct sockaddr_in *sin;
/* make SA index for search proper SA */
ip = mtod(state->m, struct ip *);
bcopy(&isr->saidx, &saidx, sizeof(saidx));
saidx.mode = isr->saidx.mode;
saidx.reqid = isr->saidx.reqid;
sin = (struct sockaddr_in *)&saidx.src;
if (sin->sin_len == 0) {
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_port = IPSEC_PORT_ANY;
bcopy(&ip->ip_src, &sin->sin_addr, sizeof(sin->sin_addr));
}
sin = (struct sockaddr_in *)&saidx.dst;
if (sin->sin_len == 0) {
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_port = IPSEC_PORT_ANY;
bcopy(&ip->ip_dst, &sin->sin_addr, sizeof(sin->sin_addr));
}
return key_checkrequest(isr, &saidx);
}
/*
* IPsec output logic for IPv4.
*/
int
ipsec4_output(state, sp, flags)
struct ipsec_output_state *state;
struct secpolicy *sp;
int flags;
{
struct ip *ip = NULL;
struct ipsecrequest *isr = NULL;
int s;
int error;
struct sockaddr_in *dst4;
if (!state)
panic("state == NULL in ipsec4_output");
if (!state->m)
panic("state->m == NULL in ipsec4_output");
if (!state->ro)
panic("state->ro == NULL in ipsec4_output");
if (!state->dst)
panic("state->dst == NULL in ipsec4_output");
state->encap = 0;
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("ipsec4_output: applyed SP\n");
kdebug_secpolicy(sp));
for (isr = sp->req; isr != NULL; isr = isr->next) {
#if 0 /* give up to check restriction of transport mode */
/* XXX but should be checked somewhere */
/*
* some of the IPsec operation must be performed only in
* originating case.
*/
if (isr->saidx.mode == IPSEC_MODE_TRANSPORT
&& (flags & IP_FORWARDING))
continue;
#endif
error = ipsec4_checksa(isr, state);
if (error != 0) {
/*
* IPsec processing is required, but no SA found.
* I assume that key_acquire() had been called
* to get/establish the SA. Here I discard
* this packet because it is responsibility for
* upper layer to retransmit the packet.
*/
ipsecstat.out_nosa++;
goto bad;
}
/* validity check */
if (isr->sav == NULL) {
switch (ipsec_get_reqlevel(isr, AF_INET)) {
case IPSEC_LEVEL_USE:
continue;
case IPSEC_LEVEL_REQUIRE:
/* must be not reached here. */
panic("ipsec4_output: no SA found, but required.");
}
}
/*
* If there is no valid SA, we give up to process any
* more. In such a case, the SA's status is changed
* from DYING to DEAD after allocating. If a packet
* send to the receiver by dead SA, the receiver can
* not decode a packet because SA has been dead.
*/
if (isr->sav->state != SADB_SASTATE_MATURE
&& isr->sav->state != SADB_SASTATE_DYING) {
ipsecstat.out_nosa++;
error = EINVAL;
goto bad;
}
/*
* There may be the case that SA status will be changed when
* we are refering to one. So calling splsoftnet().
*/
s = splnet();
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
/*
* build IPsec tunnel.
*/
/* XXX should be processed with other familiy */
if (((struct sockaddr *)&isr->sav->sah->saidx.src)->sa_family != AF_INET) {
ipseclog((LOG_ERR, "ipsec4_output: "
"family mismatched between inner and outer spi=%u\n",
(u_int32_t)ntohl(isr->sav->spi)));
splx(s);
error = EAFNOSUPPORT;
goto bad;
}
state->m = ipsec4_splithdr(state->m);
if (!state->m) {
splx(s);
error = ENOMEM;
goto bad;
}
error = ipsec4_encapsulate(state->m, isr->sav);
splx(s);
if (error) {
state->m = NULL;
goto bad;
}
ip = mtod(state->m, struct ip *);
state->ro = &isr->sav->sah->sa_route;
state->dst = (struct sockaddr *)&state->ro->ro_dst;
dst4 = (struct sockaddr_in *)state->dst;
if (state->ro->ro_rt
&& ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
|| dst4->sin_addr.s_addr != ip->ip_dst.s_addr)) {
RTFREE(state->ro->ro_rt);
state->ro->ro_rt = NULL;
}
if (state->ro->ro_rt == 0) {
dst4->sin_family = AF_INET;
dst4->sin_len = sizeof(*dst4);
dst4->sin_addr = ip->ip_dst;
rtalloc(state->ro);
}
if (state->ro->ro_rt == 0) {
ipstat.ips_noroute++;
error = EHOSTUNREACH;
goto bad;
}
/* adjust state->dst if tunnel endpoint is offlink */
if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
dst4 = (struct sockaddr_in *)state->dst;
}
state->encap++;
} else
splx(s);
state->m = ipsec4_splithdr(state->m);
if (!state->m) {
error = ENOMEM;
goto bad;
}
switch (isr->saidx.proto) {
case IPPROTO_ESP:
#ifdef IPSEC_ESP
if ((error = esp4_output(state->m, isr)) != 0) {
state->m = NULL;
goto bad;
}
break;
#else
m_freem(state->m);
state->m = NULL;
error = EINVAL;
goto bad;
#endif
case IPPROTO_AH:
if ((error = ah4_output(state->m, isr)) != 0) {
state->m = NULL;
goto bad;
}
break;
case IPPROTO_IPCOMP:
if ((error = ipcomp4_output(state->m, isr)) != 0) {
state->m = NULL;
goto bad;
}
break;
default:
ipseclog((LOG_ERR,
"ipsec4_output: unknown ipsec protocol %d\n",
isr->saidx.proto));
m_freem(state->m);
state->m = NULL;
error = EINVAL;
goto bad;
}
if (state->m == 0) {
error = ENOMEM;
goto bad;
}
ip = mtod(state->m, struct ip *);
}
return 0;
bad:
m_freem(state->m);
state->m = NULL;
return error;
}
#endif
#ifdef INET6
static int
ipsec6_checksa(isr, state, tunnel)
struct ipsecrequest *isr;
struct ipsec_output_state *state;
int tunnel;
{
struct ip6_hdr *ip6;
struct secasindex saidx;
struct sockaddr_in6 *sin6;
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
#ifdef DIAGNOSTIC
if (!tunnel)
panic("ipsec6_checksa/inconsistent tunnel attribute");
#endif
/* When tunnel mode, SA peers must be specified. */
return key_checkrequest(isr, &isr->saidx);
}
/* make SA index for search proper SA */
ip6 = mtod(state->m, struct ip6_hdr *);
if (tunnel) {
bzero(&saidx, sizeof(saidx));
saidx.proto = isr->saidx.proto;
} else
bcopy(&isr->saidx, &saidx, sizeof(saidx));
saidx.mode = isr->saidx.mode;
saidx.reqid = isr->saidx.reqid;
sin6 = (struct sockaddr_in6 *)&saidx.src;
if (sin6->sin6_len == 0 || tunnel) {
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_port = IPSEC_PORT_ANY;
in6_recoverscope(sin6, &ip6->ip6_src, NULL);
}
sin6 = (struct sockaddr_in6 *)&saidx.dst;
if (sin6->sin6_len == 0 || tunnel) {
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_port = IPSEC_PORT_ANY;
in6_recoverscope(sin6, &ip6->ip6_dst, NULL);
}
return key_checkrequest(isr, &saidx);
}
/*
* IPsec output logic for IPv6, transport mode.
*/
int
ipsec6_output_trans(state, nexthdrp, mprev, sp, flags, tun)
struct ipsec_output_state *state;
u_char *nexthdrp;
struct mbuf *mprev;
struct secpolicy *sp;
int flags;
int *tun;
{
struct ip6_hdr *ip6;
struct ipsecrequest *isr = NULL;
int error = 0;
int plen;
if (!state)
panic("state == NULL in ipsec6_output_trans");
if (!state->m)
panic("state->m == NULL in ipsec6_output_trans");
if (!nexthdrp)
panic("nexthdrp == NULL in ipsec6_output_trans");
if (!mprev)
panic("mprev == NULL in ipsec6_output_trans");
if (!sp)
panic("sp == NULL in ipsec6_output_trans");
if (!tun)
panic("tun == NULL in ipsec6_output_trans");
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("ipsec6_output_trans: applyed SP\n");
kdebug_secpolicy(sp));
*tun = 0;
for (isr = sp->req; isr; isr = isr->next) {
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
/* the rest will be handled by ipsec6_output_tunnel() */
break;
}
error = ipsec6_checksa(isr, state, 0);
if (error == EIO)
goto bad;
if (error == ENOENT) {
/*
* IPsec processing is required, but no SA found.
* I assume that key_acquire() had been called
* to get/establish the SA. Here I discard
* this packet because it is responsibility for
* upper layer to retransmit the packet.
*/
ipsec6stat.out_nosa++;
/*
* Notify the fact that the packet is discarded
* to ourselves. I believe this is better than
* just silently discarding. (jinmei@kame.net)
* XXX: should we restrict the error to TCP packets?
* XXX: should we directly notify sockets via
* pfctlinputs?
*
* Noone have initialized rcvif until this point,
* so clear it.
*/
if ((state->m->m_flags & M_PKTHDR) != 0)
state->m->m_pkthdr.rcvif = NULL;
icmp6_error(state->m, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_ADMIN, 0);
state->m = NULL; /* icmp6_error freed the mbuf */
goto bad;
}
/* validity check */
if (isr->sav == NULL) {
switch (ipsec_get_reqlevel(isr, AF_INET6)) {
case IPSEC_LEVEL_USE:
continue;
case IPSEC_LEVEL_REQUIRE:
/* must be not reached here. */
panic("ipsec6_output_trans: no SA found, but required.");
}
}
/*
* If there is no valid SA, we give up to process.
* see same place at ipsec4_output().
*/
if (isr->sav->state != SADB_SASTATE_MATURE
&& isr->sav->state != SADB_SASTATE_DYING) {
ipsec6stat.out_nosa++;
error = EINVAL;
goto bad;
}
switch (isr->saidx.proto) {
case IPPROTO_ESP:
#ifdef IPSEC_ESP
error = esp6_output(state->m, nexthdrp, mprev->m_next, isr);
#else
m_freem(state->m);
error = EINVAL;
#endif
break;
case IPPROTO_AH:
error = ah6_output(state->m, nexthdrp, mprev->m_next, isr);
break;
case IPPROTO_IPCOMP:
error = ipcomp6_output(state->m, nexthdrp, mprev->m_next, isr);
break;
default:
ipseclog((LOG_ERR, "ipsec6_output_trans: "
"unknown ipsec protocol %d\n", isr->saidx.proto));
m_freem(state->m);
ipsec6stat.out_inval++;
error = EINVAL;
break;
}
if (error) {
state->m = NULL;
goto bad;
}
plen = state->m->m_pkthdr.len - sizeof(struct ip6_hdr);
if (plen > IPV6_MAXPACKET) {
ipseclog((LOG_ERR, "ipsec6_output_trans: "
"IPsec with IPv6 jumbogram is not supported\n"));
ipsec6stat.out_inval++;
error = EINVAL; /* XXX */
goto bad;
}
ip6 = mtod(state->m, struct ip6_hdr *);
ip6->ip6_plen = htons(plen);
}
/* if we have more to go, we need a tunnel mode processing */
if (isr != NULL)
*tun = 1;
return 0;
bad:
m_freem(state->m);
state->m = NULL;
return error;
}
/*
* IPsec output logic for IPv6, tunnel mode.
*/
int
ipsec6_output_tunnel(state, sp, flags)
struct ipsec_output_state *state;
struct secpolicy *sp;
int flags;
{
struct ip6_hdr *ip6;
struct ipsecrequest *isr = NULL;
int error = 0;
int plen;
struct sockaddr_in6 *dst6;
int s;
if (!state)
panic("state == NULL in ipsec6_output_tunnel");
if (!state->m)
panic("state->m == NULL in ipsec6_output_tunnel");
if (!sp)
panic("sp == NULL in ipsec6_output_tunnel");
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("ipsec6_output_tunnel: applyed SP\n");
kdebug_secpolicy(sp));
/*
* transport mode ipsec (before the 1st tunnel mode) is already
* processed by ipsec6_output_trans().
*/
for (isr = sp->req; isr; isr = isr->next) {
if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
break;
}
for (/* already initialized */; isr; isr = isr->next) {
error = ipsec6_checksa(isr, state, 1);
if (error == EIO)
goto bad;
if (error == ENOENT) {
/*
* IPsec processing is required, but no SA found.
* I assume that key_acquire() had been called
* to get/establish the SA. Here I discard
* this packet because it is responsibility for
* upper layer to retransmit the packet.
*/
ipsec6stat.out_nosa++;
error = ENOENT;
goto bad;
}
/* validity check */
if (isr->sav == NULL) {
switch (ipsec_get_reqlevel(isr, AF_INET6)) {
case IPSEC_LEVEL_USE:
continue;
case IPSEC_LEVEL_REQUIRE:
/* must be not reached here. */
panic("ipsec6_output_tunnel: no SA found, but required.");
}
}
/*
* If there is no valid SA, we give up to process.
* see same place at ipsec4_output().
*/
if (isr->sav->state != SADB_SASTATE_MATURE
&& isr->sav->state != SADB_SASTATE_DYING) {
ipsec6stat.out_nosa++;
error = EINVAL;
goto bad;
}
/*
* There may be the case that SA status will be changed when
* we are refering to one. So calling splsoftnet().
*/
s = splnet();
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
/*
* build IPsec tunnel.
*/
/* XXX should be processed with other familiy */
if (((struct sockaddr *)&isr->sav->sah->saidx.src)->sa_family != AF_INET6) {
ipseclog((LOG_ERR, "ipsec6_output_tunnel: "
"family mismatched between inner and outer, spi=%u\n",
(u_int32_t)ntohl(isr->sav->spi)));
splx(s);
ipsec6stat.out_inval++;
error = EAFNOSUPPORT;
goto bad;
}
state->m = ipsec6_splithdr(state->m);
if (!state->m) {
splx(s);
ipsec6stat.out_nomem++;
error = ENOMEM;
goto bad;
}
error = ipsec6_encapsulate(state->m, isr->sav);
splx(s);
if (error) {
state->m = 0;
goto bad;
}
ip6 = mtod(state->m, struct ip6_hdr *);
state->ro = &isr->sav->sah->sa_route;
state->dst = (struct sockaddr *)&state->ro->ro_dst;
dst6 = (struct sockaddr_in6 *)state->dst;
if (state->ro->ro_rt &&
(!(state->ro->ro_rt->rt_flags & RTF_UP) ||
!IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr,
&ip6->ip6_dst))) {
RTFREE(state->ro->ro_rt);
state->ro->ro_rt = NULL;
}
if (state->ro->ro_rt == 0) {
bzero(dst6, sizeof(*dst6));
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof(*dst6);
dst6->sin6_addr = ip6->ip6_dst;
rtalloc(state->ro);
}
if (state->ro->ro_rt == 0) {
ip6stat.ip6s_noroute++;
ipsec6stat.out_noroute++;
error = EHOSTUNREACH;
goto bad;
}
/* adjust state->dst if tunnel endpoint is offlink */
if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
dst6 = (struct sockaddr_in6 *)state->dst;
}
} else
splx(s);
state->m = ipsec6_splithdr(state->m);
if (!state->m) {
ipsec6stat.out_nomem++;
error = ENOMEM;
goto bad;
}
ip6 = mtod(state->m, struct ip6_hdr *);
switch (isr->saidx.proto) {
case IPPROTO_ESP:
#ifdef IPSEC_ESP
error = esp6_output(state->m, &ip6->ip6_nxt,
state->m->m_next, isr);
#else
m_freem(state->m);
error = EINVAL;
#endif
break;
case IPPROTO_AH:
error = ah6_output(state->m, &ip6->ip6_nxt,
state->m->m_next, isr);
break;
case IPPROTO_IPCOMP:
/* XXX code should be here */
/* FALLTHROUGH */
default:
ipseclog((LOG_ERR, "ipsec6_output_tunnel: "
"unknown ipsec protocol %d\n", isr->saidx.proto));
m_freem(state->m);
ipsec6stat.out_inval++;
error = EINVAL;
break;
}
if (error) {
state->m = NULL;
goto bad;
}
plen = state->m->m_pkthdr.len - sizeof(struct ip6_hdr);
if (plen > IPV6_MAXPACKET) {
ipseclog((LOG_ERR, "ipsec6_output_tunnel: "
"IPsec with IPv6 jumbogram is not supported\n"));
ipsec6stat.out_inval++;
error = EINVAL; /* XXX */
goto bad;
}
ip6 = mtod(state->m, struct ip6_hdr *);
ip6->ip6_plen = htons(plen);
}
return 0;
bad:
m_freem(state->m);
state->m = NULL;
return error;
}
#endif /* INET6 */
#ifdef INET
/*
* Chop IP header and option off from the payload.
*/
static struct mbuf *
ipsec4_splithdr(m)
struct mbuf *m;
{
struct mbuf *mh;
struct ip *ip;
int hlen;
if (m->m_len < sizeof(struct ip))
panic("ipsec4_splithdr: first mbuf too short");
ip = mtod(m, struct ip *);
#ifdef _IP_VHL
hlen = _IP_VHL_HL(ip->ip_vhl) << 2;
#else
hlen = ip->ip_hl << 2;
#endif
if (m->m_len > hlen) {
MGETHDR(mh, M_DONTWAIT, MT_HEADER);
if (!mh) {
m_freem(m);
return NULL;
}
M_MOVE_PKTHDR(mh, m);
MH_ALIGN(mh, hlen);
m->m_len -= hlen;
m->m_data += hlen;
mh->m_next = m;
m = mh;
m->m_len = hlen;
bcopy((caddr_t)ip, mtod(m, caddr_t), hlen);
} else if (m->m_len < hlen) {
m = m_pullup(m, hlen);
if (!m)
return NULL;
}
return m;
}
#endif
#ifdef INET6
static struct mbuf *
ipsec6_splithdr(m)
struct mbuf *m;
{
struct mbuf *mh;
struct ip6_hdr *ip6;
int hlen;
if (m->m_len < sizeof(struct ip6_hdr))
panic("ipsec6_splithdr: first mbuf too short");
ip6 = mtod(m, struct ip6_hdr *);
hlen = sizeof(struct ip6_hdr);
if (m->m_len > hlen) {
MGETHDR(mh, M_DONTWAIT, MT_HEADER);
if (!mh) {
m_freem(m);
return NULL;
}
M_MOVE_PKTHDR(mh, m);
MH_ALIGN(mh, hlen);
m->m_len -= hlen;
m->m_data += hlen;
mh->m_next = m;
m = mh;
m->m_len = hlen;
bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
} else if (m->m_len < hlen) {
m = m_pullup(m, hlen);
if (!m)
return NULL;
}
return m;
}
#endif
/* validate inbound IPsec tunnel packet. */
int
ipsec4_tunnel_validate(m, off, nxt0, sav)
struct mbuf *m; /* no pullup permitted, m->m_len >= ip */
int off;
u_int nxt0;
struct secasvar *sav;
{
u_int8_t nxt = nxt0 & 0xff;
struct sockaddr_in *sin;
struct sockaddr_in osrc, odst, isrc, idst;
int hlen;
struct secpolicy *sp;
struct ip *oip;
#ifdef DIAGNOSTIC
if (m->m_len < sizeof(struct ip))
panic("too short mbuf on ipsec4_tunnel_validate");
#endif
if (nxt != IPPROTO_IPV4)
return 0;
if (m->m_pkthdr.len < off + sizeof(struct ip))
return 0;
/* do not decapsulate if the SA is for transport mode only */
if (sav->sah->saidx.mode == IPSEC_MODE_TRANSPORT)
return 0;
oip = mtod(m, struct ip *);
hlen = oip->ip_hl << 2;
if (hlen != sizeof(struct ip))
return 0;
/* AF_INET6 should be supported, but at this moment we don't. */
sin = (struct sockaddr_in *)&sav->sah->saidx.dst;
if (sin->sin_family != AF_INET)
return 0;
if (bcmp(&oip->ip_dst, &sin->sin_addr, sizeof(oip->ip_dst)) != 0)
return 0;
/* XXX slow */
bzero(&osrc, sizeof(osrc));
bzero(&odst, sizeof(odst));
bzero(&isrc, sizeof(isrc));
bzero(&idst, sizeof(idst));
osrc.sin_family = odst.sin_family = isrc.sin_family = idst.sin_family =
AF_INET;
osrc.sin_len = odst.sin_len = isrc.sin_len = idst.sin_len =
sizeof(struct sockaddr_in);
osrc.sin_addr = oip->ip_src;
odst.sin_addr = oip->ip_dst;
m_copydata(m, off + offsetof(struct ip, ip_src), sizeof(isrc.sin_addr),
(caddr_t)&isrc.sin_addr);
m_copydata(m, off + offsetof(struct ip, ip_dst), sizeof(idst.sin_addr),
(caddr_t)&idst.sin_addr);
/*
* RFC2401 5.2.1 (b): (assume that we are using tunnel mode)
* - if the inner destination is multicast address, there can be
* multiple permissible inner source address. implementation
* may want to skip verification of inner source address against
* SPD selector.
* - if the inner protocol is ICMP, the packet may be an error report
* from routers on the other side of the VPN cloud (R in the
* following diagram). in this case, we cannot verify inner source
* address against SPD selector.
* me -- gw === gw -- R -- you
*
* we consider the first bullet to be users responsibility on SPD entry
* configuration (if you need to encrypt multicast traffic, set
* the source range of SPD selector to 0.0.0.0/0, or have explicit
* address ranges for possible senders).
* the second bullet is not taken care of (yet).
*
* therefore, we do not do anything special about inner source.
*/
sp = key_gettunnel((struct sockaddr *)&osrc, (struct sockaddr *)&odst,
(struct sockaddr *)&isrc, (struct sockaddr *)&idst);
/*
* when there is no suitable inbound policy for the packet of the ipsec
* tunnel mode, the kernel never decapsulate the tunneled packet
* as the ipsec tunnel mode even when the system wide policy is "none".
* then the kernel leaves the generic tunnel module to process this
* packet. if there is no rule of the generic tunnel, the packet
* is rejected and the statistics will be counted up.
*/
if (!sp)
return 0;
key_freesp(sp);
return 1;
}
#ifdef INET6
/* validate inbound IPsec tunnel packet. */
int
ipsec6_tunnel_validate(m, off, nxt0, sav)
struct mbuf *m; /* no pullup permitted, m->m_len >= ip */
int off;
u_int nxt0;
struct secasvar *sav;
{
u_int8_t nxt = nxt0 & 0xff;
struct sockaddr_in6 *sin6;
struct sockaddr_in6 osrc, odst, isrc, idst;
struct secpolicy *sp;
struct ip6_hdr *oip6;
#ifdef DIAGNOSTIC
if (m->m_len < sizeof(struct ip6_hdr))
panic("too short mbuf on ipsec6_tunnel_validate");
#endif
if (nxt != IPPROTO_IPV6)
return 0;
if (m->m_pkthdr.len < off + sizeof(struct ip6_hdr))
return 0;
/* do not decapsulate if the SA is for transport mode only */
if (sav->sah->saidx.mode == IPSEC_MODE_TRANSPORT)
return 0;
oip6 = mtod(m, struct ip6_hdr *);
/* AF_INET should be supported, but at this moment we don't. */
sin6 = (struct sockaddr_in6 *)&sav->sah->saidx.dst;
if (sin6->sin6_family != AF_INET6)
return 0;
if (!IN6_ARE_ADDR_EQUAL(&oip6->ip6_dst, &sin6->sin6_addr))
return 0;
/* XXX slow */
bzero(&osrc, sizeof(osrc));
bzero(&odst, sizeof(odst));
bzero(&isrc, sizeof(isrc));
bzero(&idst, sizeof(idst));
osrc.sin6_family = odst.sin6_family = isrc.sin6_family =
idst.sin6_family = AF_INET6;
osrc.sin6_len = odst.sin6_len = isrc.sin6_len = idst.sin6_len =
sizeof(struct sockaddr_in6);
osrc.sin6_addr = oip6->ip6_src;
odst.sin6_addr = oip6->ip6_dst;
m_copydata(m, off + offsetof(struct ip6_hdr, ip6_src),
sizeof(isrc.sin6_addr), (caddr_t)&isrc.sin6_addr);
m_copydata(m, off + offsetof(struct ip6_hdr, ip6_dst),
sizeof(idst.sin6_addr), (caddr_t)&idst.sin6_addr);
/*
* regarding to inner source address validation, see a long comment
* in ipsec4_tunnel_validate.
*/
sp = key_gettunnel((struct sockaddr *)&osrc, (struct sockaddr *)&odst,
(struct sockaddr *)&isrc, (struct sockaddr *)&idst);
if (!sp)
return 0;
key_freesp(sp);
return 1;
}
#endif
/*
* Make a mbuf chain for encryption.
* If the original mbuf chain contains a mbuf with a cluster,
* allocate a new cluster and copy the data to the new cluster.
* XXX: this hack is inefficient, but is necessary to handle cases
* of TCP retransmission...
*/
struct mbuf *
ipsec_copypkt(m)
struct mbuf *m;
{
struct mbuf *n, **mpp, *mnew;
for (n = m, mpp = &m; n; n = n->m_next) {
if (n->m_flags & M_EXT) {
/*
* Make a copy only if there is more than one
* references to the cluster.
* XXX: is this approach effective?
*/
if (!M_WRITABLE(n)) {
int remain, copied;
struct mbuf *mm;
if (n->m_flags & M_PKTHDR) {
MGETHDR(mnew, M_DONTWAIT, MT_HEADER);
if (mnew == NULL)
goto fail;
mnew->m_pkthdr = n->m_pkthdr;
#if 0
/* XXX: convert to m_tag or delete? */
if (n->m_pkthdr.aux) {
mnew->m_pkthdr.aux =
m_copym(n->m_pkthdr.aux,
0, M_COPYALL, M_DONTWAIT);
}
#endif
M_MOVE_PKTHDR(mnew, n);
}
else {
MGET(mnew, M_DONTWAIT, MT_DATA);
if (mnew == NULL)
goto fail;
}
mnew->m_len = 0;
mm = mnew;
/*
* Copy data. If we don't have enough space to
* store the whole data, allocate a cluster
* or additional mbufs.
* XXX: we don't use m_copyback(), since the
* function does not use clusters and thus is
* inefficient.
*/
remain = n->m_len;
copied = 0;
while (1) {
int len;
struct mbuf *mn;
if (remain <= (mm->m_flags & M_PKTHDR ? MHLEN : MLEN))
len = remain;
else { /* allocate a cluster */
MCLGET(mm, M_DONTWAIT);
if (!(mm->m_flags & M_EXT)) {
m_free(mm);
goto fail;
}
len = remain < MCLBYTES ?
remain : MCLBYTES;
}
bcopy(n->m_data + copied, mm->m_data,
len);
copied += len;
remain -= len;
mm->m_len = len;
if (remain <= 0) /* completed? */
break;
/* need another mbuf */
MGETHDR(mn, M_DONTWAIT, MT_HEADER);
if (mn == NULL)
goto fail;
mn->m_pkthdr.rcvif = NULL;
mm->m_next = mn;
mm = mn;
}
/* adjust chain */
mm->m_next = m_free(n);
n = mm;
*mpp = mnew;
mpp = &n->m_next;
continue;
}
}
*mpp = n;
mpp = &n->m_next;
}
return (m);
fail:
m_freem(m);
return (NULL);
}
static struct ipsecaux *
ipsec_addaux(m)
struct mbuf *m;
{
struct m_tag *mtag;
mtag = m_tag_find(m, PACKET_TAG_IPSEC_HISTORY, NULL);
if (mtag == NULL) {
mtag = m_tag_get(PACKET_TAG_IPSEC_HISTORY,
sizeof(struct ipsecaux), M_NOWAIT);
if (mtag != NULL)
m_tag_prepend(m, mtag);
}
if (mtag == NULL)
return NULL; /* ENOBUFS */
/* XXX is this necessary? */
bzero((void *)(mtag + 1), sizeof(struct ipsecaux));
return mtag ? (struct ipsecaux *)(mtag + 1) : NULL;
}
static struct ipsecaux *
ipsec_findaux(m)
struct mbuf *m;
{
struct m_tag *mtag;
mtag = m_tag_find(m, PACKET_TAG_IPSEC_HISTORY, NULL);
return mtag ? (struct ipsecaux *)(mtag + 1) : NULL;
}
void
ipsec_delaux(m)
struct mbuf *m;
{
struct m_tag *mtag;
mtag = m_tag_find(m, PACKET_TAG_IPSEC_HISTORY, NULL);
if (mtag != NULL)
m_tag_delete(m, mtag);
}
/* if the aux buffer is unnecessary, nuke it. */
static void
ipsec_optaux(m, aux)
struct mbuf *m;
struct ipsecaux *aux;
{
if (aux == NULL)
return;
ipsec_delaux(m);
}
int
ipsec_addhist(m, proto, spi)
struct mbuf *m;
int proto;
u_int32_t spi;
{
struct ipsecaux *aux;
aux = ipsec_addaux(m);
if (aux == NULL)
return ENOBUFS;
aux->hdrs++;
return 0;
}
int
ipsec_getnhist(m)
struct mbuf *m;
{
struct ipsecaux *aux;
aux = ipsec_findaux(m);
if (aux == NULL)
return 0;
return aux->hdrs;
}
void
ipsec_clearhist(m)
struct mbuf *m;
{
struct ipsecaux *aux;
aux = ipsec_findaux(m);
ipsec_optaux(m, aux);
}
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