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ipsec.c
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ipsec.c
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/* $NetBSD: ipsec.c,v 1.107 2006/02/25 02:28:58 wiz Exp $ */
/* $KAME: ipsec.c,v 1.136 2002/05/19 00:36:39 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.107 2006/02/25 02:28:58 wiz Exp $");
#include "opt_inet.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 <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>
#include <netinet/tcp.h>
#include <netinet/ip6.h>
#ifdef INET6
#include <netinet6/ip6_var.h>
#endif
#include <netinet/in_pcb.h>
#ifdef INET6
#include <netinet6/in6_pcb.h>
#include <netinet/icmp6.h>
#include <netinet6/scope6_var.h>
#endif
#include <netinet6/ipsec.h>
#include <netinet6/ah.h>
#ifdef IPSEC_ESP
#include <netinet6/esp.h>
#endif
#include <netinet6/ipcomp.h>
#include <netkey/key.h>
#include <netkey/keydb.h>
#include <netkey/key_debug.h>
#include <net/net_osdep.h>
#ifdef IPSEC_DEBUG
int ipsec_debug = 1;
#else
int ipsec_debug = 0;
#endif
struct ipsecstat ipsecstat;
int ip4_ah_cleartos = 1;
int ip4_ah_offsetmask = 0; /* maybe IP_DF? */
int ip4_ipsec_dfbit = 2; /* 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) */
#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) */
#endif /* INET6 */
u_int ipsec_spdgen = 1; /* SPD generation # */
#ifdef SADB_X_EXT_TAG
static struct pf_tag *ipsec_get_tag __P((struct mbuf *));
#endif
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 m_tag *ipsec_addaux __P((struct mbuf *));
static struct m_tag *ipsec_findaux __P((struct mbuf *));
static void ipsec_optaux __P((struct mbuf *, struct m_tag *));
#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;
switch (dir) {
case IPSEC_DIR_INBOUND:
case IPSEC_DIR_OUTBOUND:
case IPSEC_DIR_ANY:
break;
default:
return NULL;
}
#ifdef DIAGNOSTIC
if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0]))
panic("dir too big in ipsec_checkpcbcache");
#endif
/* SPD table change invalidates all the caches */
if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) {
ipsec_invalpcbcache(pcbsp, dir);
return NULL;
}
if (!pcbsp->sp_cache[dir].cachesp)
return NULL;
if (pcbsp->sp_cache[dir].cachesp->state != IPSEC_SPSTATE_ALIVE) {
ipsec_invalpcbcache(pcbsp, dir);
return NULL;
}
if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) {
if (!pcbsp->sp_cache[dir].cachesp)
return NULL;
if (ipsec_setspidx(m, &spidx, 1) != 0)
return NULL;
if (bcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx,
sizeof(spidx))) {
if (!pcbsp->sp_cache[dir].cachesp->spidx ||
!key_cmpspidx_withmask(pcbsp->sp_cache[dir].cachesp->spidx,
&spidx))
return NULL;
pcbsp->sp_cache[dir].cacheidx = 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->sp_cache[dir].cachesp->lastused = mono_time.tv_sec;
pcbsp->sp_cache[dir].cachesp->refcnt++;
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n",
pcbsp->sp_cache[dir].cachesp->refcnt,
pcbsp->sp_cache[dir].cachesp));
return pcbsp->sp_cache[dir].cachesp;
}
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->sp_cache)/sizeof(pcbsp->sp_cache[0]))
panic("dir too big in ipsec_checkpcbcache");
#endif
if (pcbsp->sp_cache[dir].cachesp)
key_freesp(pcbsp->sp_cache[dir].cachesp);
pcbsp->sp_cache[dir].cachesp = NULL;
pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE;
if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) {
return EINVAL;
}
pcbsp->sp_cache[dir].cachesp = sp;
if (pcbsp->sp_cache[dir].cachesp) {
pcbsp->sp_cache[dir].cachesp->refcnt++;
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n",
pcbsp->sp_cache[dir].cachesp->refcnt,
pcbsp->sp_cache[dir].cachesp));
/*
* If the PCB is connected, we can remember a hint to
* possibly short-circuit IPsec processing in other places.
*/
if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) {
switch (pcbsp->sp_cache[dir].cachesp->policy) {
case IPSEC_POLICY_NONE:
case IPSEC_POLICY_BYPASS:
pcbsp->sp_cache[dir].cachehint =
IPSEC_PCBHINT_NO;
break;
default:
pcbsp->sp_cache[dir].cachehint =
IPSEC_PCBHINT_YES;
}
}
}
pcbsp->sp_cache[dir].cachegen = ipsec_spdgen;
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->sp_cache[i].cachesp)
key_freesp(pcbsp->sp_cache[i].cachesp);
pcbsp->sp_cache[i].cachesp = NULL;
pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE;
pcbsp->sp_cache[i].cachegen = 0;
bzero(&pcbsp->sp_cache[i].cacheidx,
sizeof(pcbsp->sp_cache[i].cacheidx));
}
return 0;
}
int
ipsec_pcbconn(pcbsp)
struct inpcbpolicy *pcbsp;
{
pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED;
ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
return 0;
}
int
ipsec_pcbdisconn(pcbsp)
struct inpcbpolicy *pcbsp;
{
pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED;
ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
return 0;
}
void
ipsec_invalpcbcacheall()
{
if (ipsec_spdgen == UINT_MAX)
ipsec_spdgen = 1;
else
ipsec_spdgen++;
}
#ifdef SADB_X_EXT_TAG
static struct pf_tag *
ipsec_get_tag(m)
struct mbuf *m;
{
struct m_tag *mtag;
if ((mtag = m_tag_find(m, PACKET_TAG_PF_TAG, NULL)) != NULL)
return ((struct pf_tag *)(mtag + 1));
else
return (NULL);
}
#endif
/*
* 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 occurred.
* others: a pointer to SP
*
* NOTE: IPv6 mapped address concern is implemented here.
*/
struct secpolicy *
ipsec4_getpolicybysock(m, dir, so, error)
struct mbuf *m;
u_int dir;
struct socket *so;
int *error;
{
struct inpcbpolicy *pcbsp = NULL;
struct secpolicy *currsp = NULL; /* policy on socket */
struct secpolicy *kernsp = NULL; /* policy on kernel */
struct secpolicyindex spidx;
#ifdef SADB_X_EXT_TAG
struct pf_tag *t;
#endif
u_int16_t tag;
/* sanity check */
if (m == NULL || so == NULL || error == NULL)
panic("ipsec4_getpolicybysock: NULL pointer was passed.");
switch (so->so_proto->pr_domain->dom_family) {
case AF_INET:
pcbsp = sotoinpcb(so)->inp_sp;
break;
#ifdef INET6
case AF_INET6:
pcbsp = sotoin6pcb(so)->in6p_sp;
break;
#endif
default:
panic("ipsec4_getpolicybysock: unsupported address family");
}
#ifdef DIAGNOSTIC
if (pcbsp == NULL)
panic("ipsec4_getpolicybysock: pcbsp is NULL.");
#endif
#ifdef SADB_X_EXT_TAG
t = ipsec_get_tag(m);
tag = t ? t->tag : 0;
#else
tag = 0;
#endif
/* 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_getpolicybysock: illegal direction.");
}
/* sanity check */
if (currsp == NULL)
panic("ipsec4_getpolicybysock: 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_getpolicybysock 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_getpolicybysock: "
"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_getpolicybysock 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_getpolicybysock: "
"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_getpolicybysock: "
"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 occurred.
*/
struct secpolicy *
ipsec4_getpolicybyaddr(m, dir, flag, error)
struct mbuf *m;
u_int dir;
int flag;
int *error;
{
struct secpolicy *sp = NULL;
#ifdef SADB_X_EXT_TAG
struct pf_tag *t;
#endif
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;
#ifdef SADB_X_EXT_TAG
t = ipsec_get_tag(m);
tag = t ? t->tag : 0;
#else
tag = 0;
#endif
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 occurred.
* others: a pointer to SP
*/
struct secpolicy *
ipsec6_getpolicybysock(m, dir, so, error)
struct mbuf *m;
u_int dir;
struct socket *so;
int *error;
{
struct inpcbpolicy *pcbsp = NULL;
struct secpolicy *currsp = NULL; /* policy on socket */
struct secpolicy *kernsp = NULL; /* policy on kernel */
struct secpolicyindex spidx;
#ifdef SADB_X_EXT_TAG
struct pf_tag *t;
#endif
u_int16_t tag;
/* sanity check */
if (m == NULL || so == NULL || error == NULL)
panic("ipsec6_getpolicybysock: NULL pointer was passed.");
#ifdef DIAGNOSTIC
if (so->so_proto->pr_domain->dom_family != AF_INET6)
panic("ipsec6_getpolicybysock: socket domain != inet6");
#endif
pcbsp = sotoin6pcb(so)->in6p_sp;
#ifdef DIAGNOSTIC
if (pcbsp == NULL)
panic("ipsec6_getpolicybysock: pcbsp is NULL.");
#endif
#ifdef SADB_X_EXT_TAG
t = ipsec_get_tag(m);
tag = t ? t->tag : 0;
#else
tag = 0;
#endif
/* 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_getpolicybysock: illegal direction.");
}
/* sanity check */
if (currsp == NULL)
panic("ipsec6_getpolicybysock: 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_getpolicybysock 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_getpolicybysock: "
"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_getpolicybysock 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_getpolicybysock: "
"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 occurred.
*/
#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;
#ifdef SADB_X_EXT_TAG
struct pf_tag *t;
#endif
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;
#ifdef SADB_X_EXT_TAG
t = ipsec_get_tag(m);
tag = t ? t->tag : 0;
#else
tag = 0;
#endif
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;
}
v = ip->ip_v;
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);
if (ip.ip_off & htons(IP_MF | IP_OFFMASK))
return;
nxt = ip.ip_p;
off = ip.ip_hl << 2;
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)