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NetBSD/sys/netinet6/ipsec.c

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/* $NetBSD: ipsec.c,v 1.9 1999/07/31 18:41:16 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.
*/
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
#include "opt_inet.h"
#ifdef __NetBSD__ /*XXX*/
#include "opt_ipsec.h"
#endif
#endif
#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>
#ifdef __NetBSD__
#include <sys/proc.h>
#include <vm/vm.h>
#endif
#if defined(__NetBSD__) || defined(__FreeBSD__)
#include <sys/sysctl.h>
#endif
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.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.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/ip6_var.h>
#include <netinet6/icmp6.h>
#endif /*INET6*/
#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>
#ifdef __NetBSD__
#define ovbcopy bcopy
#endif
struct ipsecstat ipsecstat;
int ip4_inbound_call_ike = 0;
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) */
#ifdef __FreeBSD__
/* net.inet.ipsec */
SYSCTL_STRUCT(_net_inet_ipsec, IPSECCTL_STATS,
stats, CTLFLAG_RD, &ipsecstat, ipsecstat, "");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
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_INBOUND_CALL_IKE,
inbound_call_ike, CTLFLAG_RW, &ip4_inbound_call_ike, 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, "");
#endif /* __FreeBSD__ */
#ifdef INET6
struct ipsecstat ipsec6stat;
int ip6_inbound_call_ike = 0;
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) */
#ifdef __FreeBSD__
/* net.inet6.ipsec6 */
SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS,
stats, CTLFLAG_RD, &ipsec6stat, ipsecstat, "");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
def_policy, CTLFLAG_RW, &ip6_def_policy.policy, 0, "");
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_INBOUND_CALL_IKE,
inbound_call_ike, CTLFLAG_RW, &ip6_inbound_call_ike, 0, "");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "");
#endif /*__FreeBSD__*/
#endif /* INET6 */
static int ipsec_setsecidx __P((struct secindex *, u_int, struct mbuf *, int));
#if 0
static void ipsec_setsecidx_pcb __P((struct secindex *, u_int, u_int,
void *, u_int, void *, u_int));
static int ipsec_delete_policy __P((struct secpolicy *));
#endif
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 *));
static struct mbuf *ipsec4_splithdr __P((struct mbuf *));
#ifdef INET6
static struct mbuf *ipsec6_splithdr __P((struct mbuf *));
#endif
static int ipsec4_encapsulate __P((struct mbuf *, struct secas *));
#ifdef INET6
static int ipsec6_encapsulate __P((struct mbuf *, struct secas *));
#endif
#if 1
#define KMALLOC(p, t, n) \
((p) = (t) malloc((unsigned long)(n), M_SECA, M_NOWAIT))
#define KFREE(p) \
free((caddr_t)(p), M_SECA);
#else
#define KMALLOC(p, t, n) \
do { \
((p) = (t)malloc((unsigned long)(n), M_SECA, M_NOWAIT));\
printf("%s %d: %p <- KMALLOC(%s, %d)\n", \
__FILE__, __LINE__, (p), #t, n); \
} while (0)
#define KFREE(p) \
do { \
printf("%s %d: %p -> KFREE()\n", __FILE__, __LINE__, (p));\
free((caddr_t)(p), M_SECA); \
} while (0)
#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 occured.
* others: a pointer to SP
*
* NOTE: IPv6 mapped adddress concern is implemented here.
*/
struct secpolicy *
ipsec4_getpolicybysock(m, so, error)
struct mbuf *m;
struct socket *so;
int *error;
{
struct secpolicy *sp = NULL; /* policy on socket */
struct secpolicy *kernsp = NULL; /* policy on kernel */
int priv = 0;
if (m == NULL || so == NULL || error == NULL)
panic("ipsec4_getpolicybysock: NULL pointer was passed.\n");
switch (so->so_proto->pr_domain->dom_family) {
case AF_INET:
sp = sotoinpcb(so)->inp_sp;
#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
if (so->so_uid == 0) /*XXX*/
priv = 1;
else
priv = 0;
#else
priv = sotoinpcb(so)->inp_socket->so_state & SS_PRIV;
#endif
break;
#ifdef INET6
case AF_INET6:
sp = sotoin6pcb(so)->in6p_sp;
#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
if (so->so_uid == 0) /*XXX*/
priv = 1;
else
priv = 0;
#else
priv = sotoin6pcb(so)->in6p_socket->so_state & SS_PRIV;
#endif
break;
#endif
default:
panic("ipsec4_getpolicybysock: unsupported address family\n");
}
/* sanity check */
if (sp == NULL)
panic("ipsec4_getpolicybysock: PCB's SP is NULL.\n");
/* when privilieged socket */
if (priv) {
switch (sp->policy) {
case IPSEC_POLICY_BYPASS:
sp->refcnt++;
*error = 0;
return sp;
case IPSEC_POLICY_ENTRUST:
{
struct secindex idx;
bzero(&idx, sizeof(idx));
*error = ipsec_setsecidx(&idx, AF_INET, m, 1);
if (*error != 0) {
*error = ENOBUFS;
return NULL;
}
kernsp = key_allocsp(&idx);
}
/* SP found */
if (kernsp != NULL) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec4_getpolicybysock called "
"to allocate SP:%p\n", kernsp));
*error = 0;
return kernsp;
}
/* no SP found */
if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD
&& ip4_def_policy.policy != IPSEC_POLICY_NONE) {
printf("fixed system default policy:%d->%d\n",
ip4_def_policy.policy,
IPSEC_POLICY_NONE);
ip4_def_policy.policy = IPSEC_POLICY_NONE;
}
ip4_def_policy.refcnt++;
*error = 0;
return &ip4_def_policy;
case IPSEC_POLICY_IPSEC:
sp->refcnt++;
ipsec_setsecidx(&sp->idx, AF_INET, m, 1);
*error = 0;
return sp;
default:
printf("ipsec4_getpolicybysock: "
"Invalid policy for PCB %d\n",
sp->policy);
*error = EINVAL;
return NULL;
}
/* NOTREACHED */
}
/* when non-privilieged socket */
{
struct secindex idx;
/* make a index to look for a policy */
bzero(&idx, sizeof(idx));
if ((*error = ipsec_setsecidx(&idx, AF_INET, m, 1)) != 0)
return NULL;
kernsp = key_allocsp(&idx);
}
/* SP found */
if (kernsp != NULL) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec4_getpolicybysock called "
"to allocate SP:%p\n", kernsp));
*error = 0;
return kernsp;
}
/* no SP found */
switch (sp->policy) {
case IPSEC_POLICY_BYPASS:
printf("ipsec4_getpolicybysock: "
"Illegal policy for non-priviliged defined %d\n",
sp->policy);
*error = EINVAL;
return NULL;
case IPSEC_POLICY_ENTRUST:
if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD
&& ip4_def_policy.policy != IPSEC_POLICY_NONE) {
printf("fixed system default policy:%d->%d\n",
ip4_def_policy.policy,
IPSEC_POLICY_NONE);
ip4_def_policy.policy = IPSEC_POLICY_NONE;
}
ip4_def_policy.refcnt++;
*error = 0;
return &ip4_def_policy;
case IPSEC_POLICY_IPSEC:
sp->refcnt++;
ipsec_setsecidx(&sp->idx, AF_INET, m, 1);
*error = 0;
return sp;
default:
printf("ipsec4_policybysock: "
"Invalid policy for PCB %d\n",
sp->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, flag, error)
struct mbuf *m;
int flag;
int *error;
{
struct secpolicy *sp = NULL;
/* sanity check */
if (m == NULL || error == NULL)
panic("ipsec4_getpolicybyaddr: NULL pointer was passed.\n");
{
struct secindex idx;
bzero(&idx, sizeof(idx));
/* make a index to look for a policy */
if ((flag & IP_FORWARDING) == IP_FORWARDING)
*error = ipsec_setsecidx(&idx, AF_INET, m, 2);
else
*error = ipsec_setsecidx(&idx, AF_INET, m, 1);
if (*error != 0)
return NULL;
sp = key_allocsp(&idx);
}
/* 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 */
if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD
&& ip4_def_policy.policy != IPSEC_POLICY_NONE) {
printf("fixed system default policy:%d->%d\n",
ip4_def_policy.policy,
IPSEC_POLICY_NONE);
ip4_def_policy.policy = IPSEC_POLICY_NONE;
}
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_getpolicybysock(m, so, error)
struct mbuf *m;
struct socket *so;
int *error;
{
struct in6pcb *in6p = sotoin6pcb(so);
struct secpolicy *sp = NULL;
int priv = 0;
/* sanity check */
if (m == NULL || so == NULL || error == NULL)
panic("ipsec6_getpolicybysock: NULL pointer was passed.\n");
if (in6p == NULL)
panic("ipsec6_getpolicybysock: no PCB found.\n");
if (in6p->in6p_sp == NULL)
panic("ipsec6_getpolicybysock: PCB's SP is NULL.\n");
if (in6p->in6p_socket == NULL)
panic("ipsec6_getpolicybysock: no socket found.\n");
/* when privilieged socket */
#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
if (so->so_uid == 0) /*XXX*/
priv = 1;
else
priv = 0;
#else
priv = (in6p->in6p_socket->so_state & SS_PRIV);
#endif
if (priv) {
switch (in6p->in6p_sp->policy) {
case IPSEC_POLICY_BYPASS:
in6p->in6p_sp->refcnt++;
*error = 0;
return in6p->in6p_sp;
case IPSEC_POLICY_ENTRUST:
{
struct secindex idx;
/* make a index to look for a policy */
bzero(&idx, sizeof(idx));
*error = ipsec_setsecidx(&idx, AF_INET6, m, 1);
if (*error != 0)
return NULL;
sp = key_allocsp(&idx);
}
/* SP found */
if (sp != NULL) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec6_getpolicybysock called "
"to allocate SP:%p\n", sp));
*error = 0;
return sp;
}
/* no SP found */
if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD
&& ip6_def_policy.policy != IPSEC_POLICY_NONE) {
printf("fixed system default policy:%d->%d\n",
ip6_def_policy.policy,
IPSEC_POLICY_NONE);
ip6_def_policy.policy = IPSEC_POLICY_NONE;
}
ip6_def_policy.refcnt++;
*error = 0;
return &ip6_def_policy;
case IPSEC_POLICY_IPSEC:
in6p->in6p_sp->refcnt++;
ipsec_setsecidx(&in6p->in6p_sp->idx, AF_INET6, m, 1);
*error = 0;
return in6p->in6p_sp;
default:
printf("ipsec6_getpolicybysock: "
"Invalid policy for PCB %d\n",
in6p->in6p_sp->policy);
*error = EINVAL;
return NULL;
}
/* NOTREACHED */
}
/* when non-privilieged socket */
{
struct secindex idx;
bzero(&idx, sizeof(idx));
/* make a index to look for a policy */
if ((*error = ipsec_setsecidx(&idx, AF_INET6, m, 1)) != 0)
return NULL;
sp = key_allocsp(&idx);
}
/* SP found */
if (sp != NULL) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec6_getpolicybysock called "
"to allocate SP:%p\n", sp));
*error = 0;
return sp;
}
/* no SP found */
switch (in6p->in6p_sp->policy) {
case IPSEC_POLICY_BYPASS:
printf("ipsec6_getpolicybysock: "
"Illegal policy for non-priviliged defined %d\n",
in6p->in6p_sp->policy);
*error = EINVAL;
return NULL;
case IPSEC_POLICY_ENTRUST:
if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD
&& ip6_def_policy.policy != IPSEC_POLICY_NONE) {
printf("fixed system default policy:%d->%d\n",
ip6_def_policy.policy,
IPSEC_POLICY_NONE);
ip6_def_policy.policy = IPSEC_POLICY_NONE;
}
ip6_def_policy.refcnt++;
*error = 0;
return &ip6_def_policy;
case IPSEC_POLICY_IPSEC:
in6p->in6p_sp->refcnt++;
ipsec_setsecidx(&in6p->in6p_sp->idx, AF_INET6, m, 1);
*error = 0;
return in6p->in6p_sp;
default:
printf("ipsec6_policybysock: "
"Invalid policy for PCB %d\n",
in6p->in6p_sp->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, flag, error)
struct mbuf *m;
int flag;
int *error;
{
struct secpolicy *sp = NULL;
/* sanity check */
if (m == NULL || error == NULL)
panic("ipsec6_getpolicybyaddr: NULL pointer was passed.\n");
{
struct secindex idx;
bzero(&idx, sizeof(idx));
/* make a index to look for a policy */
if ((flag & IP_FORWARDING) == IP_FORWARDING)
*error = ipsec_setsecidx(&idx, AF_INET6, m, 2);
else
*error = ipsec_setsecidx(&idx, AF_INET6, m, 1);
if (*error != 0)
return NULL;
sp = key_allocsp(&idx);
}
/* 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 */
if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD
&& ip6_def_policy.policy != IPSEC_POLICY_NONE) {
printf("fixed system default policy:%d->%d\n",
ip6_def_policy.policy,
IPSEC_POLICY_NONE);
ip6_def_policy.policy = IPSEC_POLICY_NONE;
}
ip6_def_policy.refcnt++;
*error = 0;
return &ip6_def_policy;
}
#endif /* INET6 */
/*
* seting the values for address from mbuf to secindex structure allocated.
* IN: according to flag, taking the followings from mbuf.
* == 1: protocol family, src, dst, next protocol, src port, dst port.
* This function is called before fragment and after reassemble.
* == 2: protocol family, src, dst, next protocol.
* For the forwarding packet.
* == 3: protocol family, src, dst, security protocol, spi.
* XXX reserved for inbound processing. ??
* OUT:
* 0: success.
* 1: failure.
*/
int
ipsec_setsecidx(idx, family, m, flag)
struct secindex *idx;
u_int family;
struct mbuf *m;
int flag;
{
/* sanity check */
if (idx == NULL || m == NULL)
panic("ipsec_setsecidx: NULL pointer was passed.\n");
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setsecidx: begin\n"); kdebug_mbuf(m));
idx->family = family;
idx->prefs = idx->prefd = _INALENBYAF(family) << 3;
{
/* sanity check for packet length. */
struct mbuf *n;
int tlen;
tlen = 0;
for (n = m; n; n = n->m_next)
tlen += n->m_len;
if (m->m_pkthdr.len != tlen) {
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setsecidx: "
"total of m_len(%d) != pkthdr.len(%d), "
"ignored.\n",
tlen, m->m_pkthdr.len));
goto bad;
}
}
switch (family) {
case AF_INET:
{
struct ip *ip;
struct ip ipbuf;
/* sanity check 1 for minimum ip header length */
if (m->m_pkthdr.len < sizeof(struct ip)) {
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setsecidx: "
"pkthdr.len(%d) < sizeof(struct ip), "
"ignored.\n",
m->m_pkthdr.len));
goto bad;
}
/*
* get IPv4 header packet. usually the mbuf is contiguous
* and we need no copies.
*/
if (m->m_len >= sizeof(*ip))
ip = mtod(m, struct ip *);
else {
m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
ip = &ipbuf;
}
/* some more checks on IPv4 header. */
#if 0
/*
* Since {udp,tcp}_input overwrites ip_v field by struct ipovly,
* this check is useless.
*/
#ifdef _IP_VHL
if (IP_VHL_V(ip->ip_vhl) != IPVERSION)
#else
if (ip->ip_v != IPVERSION)
#endif
{
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setsecidx: "
"wrong ip version on packet "
"(expected IPv4), ignored.\n"));
goto bad;
}
#endif
idx->proto = ip->ip_p;
bcopy(&ip->ip_src, &idx->src, sizeof(ip->ip_src));
bcopy(&ip->ip_dst, &idx->dst, sizeof(ip->ip_dst));
switch (flag) {
case 1:
/* get port numbers from next protocol header */
switch (ip->ip_p) {
case IPPROTO_TCP:
case IPPROTO_UDP:
{
int len;
u_short ports, portd;
/* sanity check */
/* set ip header length */
if (ip->ip_hl == 0) {
/*
* In upper layer stack,
* it is set zero to
* some values in ipovly.
*/
len = sizeof(struct ip);
} else {
#ifdef _IP_VHL
len = _IP_VHL_HL(ip->ip_vhl) << 2;
#else
len = ip->ip_hl << 2;
#endif
}
if (m->m_pkthdr.len < len + 4) {
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setsecidx: "
"pkthdr.len(%d) too short to "
"get port number information, "
"ignored.\n",
m->m_pkthdr.len));
goto bad;
}
m_copydata(m, len, 2, (caddr_t)&ports);
m_copydata(m, len + 2, 2, (caddr_t)&portd);
#if 0
idx->ports = ntohs(ports);
idx->portd = ntohs(portd);
#else
idx->ports = ports;
idx->portd = portd;
#endif
}
break;
case IPPROTO_ICMP:
default:
idx->ports = 0;
idx->portd = 0;
}
break;
case 2:
break;
case 3:
break;
}
}
break;
#ifdef INET6
case AF_INET6:
{
struct ip6_hdr *ip6_hdr;
struct ip6_hdr ip6buf;
/* sanity check 1 for minimum ip header length */
if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setsecidx: "
"pkthdr.len(%d) < sizeof(struct ip6_hdr), "
"ignored.\n",
m->m_pkthdr.len));
goto bad;
}
/*
* get IPv6 header packet. usually the mbuf is contiguous
* and we need no copies.
*/
if (m->m_len >= sizeof(*ip6_hdr))
ip6_hdr = mtod(m, struct ip6_hdr *);
else {
m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
ip6_hdr = &ip6buf;
}
/* some more checks on IPv4 header. */
if ((ip6_hdr->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setsecidx: "
"wrong ip version on packet "
"(expected IPv6), ignored.\n"));
goto bad;
}
idx->proto = 0; /* XXX */
bcopy(&ip6_hdr->ip6_src, &idx->src, sizeof(ip6_hdr->ip6_src));
bcopy(&ip6_hdr->ip6_dst, &idx->dst, sizeof(ip6_hdr->ip6_dst));
#if 0 /* XXX Do it ! */
switch (flag) {
case 1:
/* get port numbers from next protocol header */
switch (ip6->ip6_nxt) {
/* fragmented case ... */
case IPPROTO_TCP:
case IPPROTO_UDP:
break;
case IPPROTO_ICMPV6:
default:
idx->proto = 0; /* i.e. ignore */
idx->ports = 0;
idx->portd = 0;
}
break;
case 2:
case 3:
}
#else
idx->proto = 0; /* i.e. ignore */
idx->ports = 0;
idx->portd = 0;
#endif
}
break;
#endif /* INET6 */
default:
panic("ipsec_secsecidx: no supported family passed.\n");
}
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_setsecidx: end\n"); kdebug_secindex(idx));
return 0;
bad:
/* XXX initialize */
bzero(idx, sizeof(*idx));
return -1;
}
#if 0
static void
ipsec_setsecidx_pcb(idx, family, ip_p, laddr, lport, faddr, fport)
struct secindex *idx;
u_int family, ip_p, lport, fport;
void *laddr, *faddr;
{
printf("family:%u ip_p:%u pref:%u\n",
family, ip_p, _INALENBYAF(family));
ipsec_hexdump(laddr, _INALENBYAF(family)),
printf(" lport:%u\n", ntohs(lport));
ipsec_hexdump(faddr, _INALENBYAF(family)),
printf(" fport:%u\n", ntohs(fport));
idx->family = family;
idx->prefs = _INALENBYAF(family) << 8;
idx->prefd = _INALENBYAF(family) << 8;
idx->proto = ip_p;
idx->ports = lport;
idx->portd = fport;
idx->src = (caddr_t)laddr;
idx->dst = (caddr_t)faddr;
return;
}
#endif
/* initialize policy in PCB */
int
ipsec_init_policy(pcb_sp)
struct secpolicy **pcb_sp;
{
struct secpolicy *newsp;
/* sanity check. */
if (pcb_sp == NULL)
panic("ipsec_init_policy: NULL pointer was passed.\n");
if ((newsp = key_newsp()) == NULL)
return ENOBUFS;
newsp->state = IPSEC_SPSTATE_ALIVE;
newsp->policy = IPSEC_POLICY_ENTRUST;
*pcb_sp = newsp;
return 0;
}
/* deep-copy a policy in PCB */
struct secpolicy *
ipsec_copy_policy(src)
struct secpolicy *src;
{
struct ipsecrequest *newchain = NULL;
struct ipsecrequest *p;
struct ipsecrequest **q;
struct ipsecrequest *r;
struct secpolicy *dst;
dst = key_newsp();
if (src == NULL || 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) {
KMALLOC(*q, struct ipsecrequest *, sizeof(struct ipsecrequest));
if (*q == NULL)
goto fail;
bzero(*q, sizeof(**q));
(*q)->next = NULL;
(*q)->proto = p->proto;
(*q)->mode = p->mode;
(*q)->level = p->level;
(*q)->proxy = NULL;
if (p->proxy) {
KMALLOC((*q)->proxy, struct sockaddr *,
p->proxy->sa_len);
if ((*q)->proxy == NULL)
goto fail;
bcopy(p->proxy, (*q)->proxy, p->proxy->sa_len);
}
(*q)->sa = NULL;
(*q)->sp = dst;
q = &((*q)->next);
}
dst->req = newchain;
dst->state = src->state;
dst->policy = src->policy;
dst->state = src->state;
/* do not touch the refcnt fields */
return dst;
fail:
for (p = newchain; p; p = r) {
r = p->next;
if (p->proxy) {
KFREE(p->proxy);
p->proxy = NULL;
}
KFREE(p);
p = NULL;
}
return NULL;
}
/* set policy and ipsec request if present. */
int
ipsec_set_policy(pcb_sp, optname, request, reqlen, priv)
struct secpolicy **pcb_sp;
int optname, reqlen;
caddr_t request;
int priv;
{
struct sadb_x_policy *xpl = (struct sadb_x_policy *)request;
struct secpolicy *newsp = NULL;
/* sanity check. */
if (pcb_sp == NULL || *pcb_sp == NULL || xpl == NULL)
return EINVAL;
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_set_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)) == NULL)
return EINVAL; /* maybe ENOBUFS */
newsp->state = IPSEC_SPSTATE_ALIVE;
/* clear old SP and set new SP */
key_freesp(*pcb_sp);
*pcb_sp = newsp;
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_set_policy:\n");
kdebug_secpolicy(newsp));
return 0;
}
int
ipsec_get_policy(pcb_sp, mp)
struct secpolicy *pcb_sp;
struct mbuf **mp;
{
struct sadb_x_policy *xpl;
/* sanity check. */
if (pcb_sp == NULL || mp == NULL)
return EINVAL;
if ((xpl = key_sp2msg(pcb_sp)) == NULL) {
printf("ipsec_get_policy: No more memory.\n");
return ENOBUFS;
}
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
*mp = m_get(M_WAIT, MT_DATA);
#else
*mp = m_get(M_WAIT, MT_SOOPTS);
#endif
(*mp)->m_len = PFKEY_EXTLEN(xpl);
m_copyback((*mp), 0, PFKEY_EXTLEN(xpl), (caddr_t)xpl);
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
printf("ipsec_get_policy:\n");
kdebug_mbuf(*mp));
KFREE(xpl);
return 0;
}
#if 0
/* delete policy */
static int
ipsec_delete_policy(sp)
struct secpolicy *sp;
{
/* sanity check. */
if (sp == NULL)
panic("ipsec_delete_policy: NULL pointer was passed.\n");
key_freesp(sp);
return 0;
}
#endif
/* delete policy in PCB */
int
ipsec4_delete_pcbpolicy(inp)
struct inpcb *inp;
{
/* sanity check. */
if (inp == NULL)
panic("ipsec6_delete_pcbpolicy: NULL pointer was passed.\n");
if (inp->inp_sp == NULL)
return 0;
key_freesp(inp->inp_sp);
inp->inp_sp = NULL;
return 0;
}
#ifdef INET6
int
ipsec6_delete_pcbpolicy(in6p)
struct in6pcb *in6p;
{
/* sanity check. */
if (in6p == NULL)
panic("ipsec6_delete_pcbpolicy: NULL pointer was passed.\n");
if (in6p->in6p_sp == NULL)
return 0;
key_freesp(in6p->in6p_sp);
in6p->in6p_sp = NULL;
return 0;
}
#endif
/*
* return current level.
* IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
*/
u_int
ipsec_get_reqlevel(isr)
struct ipsecrequest *isr;
{
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.\n");
#define IPSEC_CHECK_DEFAULT(lev) \
(((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE) \
? (printf("fixed system default level " #lev ":%d->%d\n", \
(lev), IPSEC_LEVEL_USE), \
(lev) = IPSEC_LEVEL_USE) : (lev))
/* set default level */
switch (isr->sp->idx.family) {
#ifdef INET
case AF_INET:
esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
break;
#endif
#ifdef INET6
case AF_INET6:
esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
break;
#endif /* INET6 */
default:
panic("key_get_reqlevel: Unknown family. %d\n",
isr->sp->idx.family);
}
#undef IPSEC_CHECK_DEFAULT(lev)
/* set level */
switch (isr->level) {
case IPSEC_LEVEL_DEFAULT:
switch (isr->proto) {
case IPPROTO_ESP:
if (isr->mode == IPSEC_MODE_TUNNEL)
level = esp_net_deflev;
else
level = esp_trans_deflev;
break;
case IPPROTO_AH:
if (isr->mode == IPSEC_MODE_TUNNEL)
level = ah_net_deflev;
else
level = ah_trans_deflev;
default:
panic("ipsec_get_reqlevel: "
"Illegal protocol defined %u\n",
isr->proto);
}
break;
case IPSEC_LEVEL_USE:
case IPSEC_LEVEL_REQUIRE:
level = isr->level;
break;
default:
panic("ipsec_get_reqlevel: Illegal IPsec level %u\n",
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_hdrsiz: Invalid policy found. %d\n", sp->policy);
}
need_auth = 0;
need_conf = 0;
need_icv = 0;
for (isr = sp->req; isr != NULL; isr = isr->next) {
/* get current level */
level = ipsec_get_reqlevel(isr);
switch (isr->proto) {
case IPPROTO_ESP:
if (level == IPSEC_LEVEL_REQUIRE) {
need_conf++;
if (isr->sa != NULL
&& isr->sa->flags == SADB_X_EXT_NONE
&& isr->sa->alg_auth != SADB_AALG_NONE)
need_icv++;
}
break;
case IPPROTO_AH:
if (level == IPSEC_LEVEL_REQUIRE) {
need_auth++;
need_icv++;
}
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_so(m, so)
struct mbuf *m;
struct socket *so;
{
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 (so == NULL)
sp = ipsec4_getpolicybyaddr(m, IP_FORWARDING, &error);
else
sp = ipsec4_getpolicybysock(m, so, &error);
if (sp == NULL)
return 0; /* XXX should be panic ?
* -> No, there may be error. */
result = ipsec_in_reject(sp, m);
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ipsec4_in_reject_so call free SP:%p\n", sp));
key_freesp(sp);
return result;
}
int
ipsec4_in_reject(m, inp)
struct mbuf *m;
struct inpcb *inp;
{
if (inp == NULL)
return ipsec4_in_reject_so(m, NULL);
else {
if (inp->inp_socket)
return ipsec4_in_reject_so(m, inp->inp_socket);
else
panic("ipsec4_in_reject: invalid inpcb/socket");
}
}
#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_so(m, so)
struct mbuf *m;
struct socket *so;
{
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 (so == NULL)
sp = ipsec6_getpolicybyaddr(m, IP_FORWARDING, &error);
else
sp = ipsec6_getpolicybysock(m, so, &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_so call free SP:%p\n", sp));
key_freesp(sp);
return result;
}
int
ipsec6_in_reject(m, in6p)
struct mbuf *m;
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
struct inpcb *in6p;
#else
struct in6pcb *in6p;
#endif
{
if (in6p == NULL)
return ipsec6_in_reject_so(m, NULL);
else {
if (in6p->in6p_socket)
return ipsec6_in_reject_so(m, in6p->in6p_socket);
else
panic("ipsec6_in_reject: invalid in6p/socket");
}
}
#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_in_reject: 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\n", sp->policy);
}
siz = 0;
for (isr = sp->req; isr != NULL; isr = isr->next) {
clen = 0;
switch (isr->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->mode == IPSEC_MODE_TUNNEL
#if 0 /* XXX why ? There may be tunnel mode without IPsec. */
&& clen != 0
#endif
) {
/* sanity check */
if (isr->proxy == NULL)
panic("ipsec_hdrsiz: proxy is NULL "
"but tunnel mode.\n");
switch (isr->proxy->sa_family) {
case AF_INET:
clen += sizeof(struct ip);
break;
#ifdef INET6
case AF_INET6:
clen += sizeof(struct ip6_hdr);
break;
#endif
default:
printf("ipsec_hdrsiz: unknown AF %d "
"in IPsec tunnel SA\n",
isr->proxy->sa_family);
break;
}
}
siz += clen;
}
return siz;
}
/* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
size_t
ipsec4_hdrsiz(m, inp)
struct mbuf *m;
struct inpcb *inp;
{
struct secpolicy *sp = NULL;
int error;
size_t size;
/* sanity check */
if (m == NULL)
return 0; /* XXX should be panic ? */
if (inp != NULL && inp->inp_socket == NULL)
panic("ipsec4_hdrsize: why is socket NULL but there is PCB.");
/* 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, IP_FORWARDING, &error);
else
sp = ipsec4_getpolicybysock(m, inp->inp_socket, &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, in6p)
struct mbuf *m;
struct in6pcb *in6p;
{
struct secpolicy *sp = NULL;
int error;
size_t size;
/* sanity check */
if (m == NULL)
return 0; /* XXX shoud be panic ? */
if (in6p != NULL && in6p->in6p_socket == NULL)
panic("ipsec6_hdrsize: why is socket NULL but there is PCB.");
/* get SP for this packet */
/* XXX Is it right to call with IP_FORWARDING. */
if (in6p == NULL)
sp = ipsec6_getpolicybyaddr(m, IP_FORWARDING, &error);
else
sp = ipsec6_getpolicybysock(m, in6p->in6p_socket, &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, sa)
struct mbuf *m;
struct secas *sa;
{
struct ip *oip;
struct ip *ip;
size_t hlen;
size_t plen;
/* can't tunnel between different AFs */
if (sa->proxy->sa_family != AF_INET) {
m_freem(m);
return EINVAL;
}
#if 0
/* XXX if the proxy is myself, perform nothing. */
if (sa->saidx && key_ismyaddr(AF_INET, sa->saidx->idx.dst)) {
m_freem(m);
return EINVAL;
}
#endif
ip = mtod(m, struct ip *);
#ifdef _IP_VHL
hlen = _IP_VHL_HL(ip->ip_vhl) << 2;
#else
hlen = ip->ip_hl << 2;
#endif
/* 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->m_len != hlen)
panic("ipsec4_encapsulate: assumption failed (first mbuf length)");
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 {
printf("IPv4 ipsec: size exceeds limit: "
"leave ip_len as is (invalid packet)\n");
}
ip->ip_id = htons(ip_id++);
bcopy(&((struct sockaddr_in *)sa->proxy)->sin_addr,
&ip->ip_dst, sizeof(ip->ip_dst));
/* XXX ip_src must be updated later */
return 0;
}
#endif /*INET*/
#ifdef INET6
static int
ipsec6_encapsulate(m, sa)
struct mbuf *m;
struct secas *sa;
{
struct ip6_hdr *oip6;
struct ip6_hdr *ip6;
size_t plen;
/* can't tunnel between different AFs */
if (sa->proxy->sa_family != AF_INET6) {
m_freem(m);
return EINVAL;
}
#if 0
/* XXX if the proxy is myself, perform nothing. */
if (sa->saidx && key_ismyaddr(AF_INET6, sa->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));
/* Fake link-local scope-class addresses */
if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
oip6->ip6_src.s6_addr16[1] = 0;
if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
oip6->ip6_dst.s6_addr16[1] = 0;
/* 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;
bcopy(&((struct sockaddr_in6 *)sa->proxy)->sin6_addr,
&ip6->ip6_dst, sizeof(ip6->ip6_dst));
/* XXX ip6_src must 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.
*/
int
ipsec_chkreplay(seq, sa)
u_int32_t seq;
struct secas *sa;
{
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 (sa == NULL)
printf("ipsec_chkreplay: NULL pointer was passed.\n");
replay = sa->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;
}
}
int
ipsec_updatereplay(seq, sa)
u_int32_t seq;
struct secas *sa;
{
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 (sa == NULL)
printf("ipsec_chkreplay: NULL pointer was passed.\n");
replay = sa->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 0;
/* 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 0;
fr = frlast - diff / 8;
/* this packet already seen ? */
if ((replay->bitmap)[fr] & (1 << (diff % 8)))
return 0;
/* mark as seen */
(replay->bitmap)[fr] |= (1 << (diff % 8));
/* out of order but good */
}
ok:
if (replay->count == ~0
&& (sa->flags & SADB_X_EXT_CYCSEQ) == 0) {
return 1; /* don't increment, no more packets accepted */
}
replay->count++;
return 1;
}
/*
* shift variable length bunffer 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);
snprintf(buf, sizeof(buf), "packet(SPI=%u ", ntohl(spi));
for (p = buf; p && *p; p++)
;
snprintf(p, sizeof(buf) - (p - buf), "src=%d.%d.%d.%d",
s[0], s[1], s[2], s[3]);
for (/*nothing*/; p && *p; p++)
;
snprintf(p, sizeof(buf) - (p - buf), " dst=%d.%d.%d.%d",
d[0], d[1], d[2], d[3]);
for (/*nothing*/; p && *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;
snprintf(buf, sizeof(buf), "packet(SPI=%u ", ntohl(spi));
for (p = buf; p && *p; p++)
;
snprintf(p, sizeof(buf) - (p - buf), "src=%s",
ip6_sprintf(&ip6->ip6_src));
for (/*nothing*/; p && *p; p++)
;
snprintf(p, sizeof(buf) - (p - buf), " dst=%s",
ip6_sprintf(&ip6->ip6_dst));
for (/*nothing*/; p && *p; p++)
;
snprintf(p, sizeof(buf) - (p - buf), ")");
return buf;
}
#endif /*INET6*/
const char *
ipsec_logsastr(sa)
struct secas *sa;
{
static char buf[256];
char *p;
struct secindex *idx = &sa->saidx->idx;
snprintf(buf, sizeof(buf), "SA(SPI=%u ", ntohl(sa->spi));
for (p = buf; p && *p; p++)
;
if (idx->family == AF_INET) {
u_int8_t *s, *d;
s = (u_int8_t *)(&idx->src);
d = (u_int8_t *)(&idx->dst);
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 (idx->family == AF_INET6) {
snprintf(p, sizeof(buf) - (p - buf),
"src=%s", ip6_sprintf((struct in6_addr *)(&idx->src)));
for (/*nothing*/; p && *p; p++)
;
snprintf(p, sizeof(buf) - (p - buf),
" dst=%s", ip6_sprintf((struct in6_addr *)(&idx->dst)));
}
#endif
for (/*nothing*/; p && *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");
}
/*
* 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 in_ifaddr *ia;
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");
ip = mtod(state->m, struct ip *);
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->mode == IPSEC_MODE_TRANSPORT
&& (flags & IP_FORWARDING))
continue;
#endif
if ((error = key_checkrequest(isr)) != 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->sa == NULL) {
switch (isr->level) {
case IPSEC_LEVEL_USE:
continue;
case IPSEC_LEVEL_REQUIRE:
/* must be not reached here. */
panic("ipsec4_output: no SA found, but required.");
}
}
if (isr->sa->state != SADB_SASTATE_MATURE
&& isr->sa->state != SADB_SASTATE_DYING) {
/* If there is no valid SA, we give up to process. */
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().
*/
#ifdef __NetBSD__
s = splsoftnet();
#else
s = splnet();
#endif
if (isr->mode == IPSEC_MODE_TUNNEL && isr->proxy) {
/*
* build IPsec tunnel.
*/
/* XXX should be processed with other familiy */
if (isr->proxy->sa_family != AF_INET) {
printf("ipsec4_output: "
"wrong proxy specified for spi=%u\n",
(u_int32_t)ntohl(isr->sa->spi));
splx(s);
error = EAFNOSUPPORT;
goto bad;
}
/* validity check */
if (isr->proxy->sa_family != isr->sa->proxy->sa_family
|| bcmp(_INADDRBYSA(isr->proxy),
_INADDRBYSA(isr->sa->proxy),
_INALENBYAF(isr->proxy->sa_family)) != 0) {
printf("ipsec4_output: proxy address mismatch.\n");
#if defined(IPSEC_DEBUG)
printf(" SP: ");
ipsec_hexdump((caddr_t)isr->proxy,
_SALENBYAF(isr->proxy->sa_family));
printf("\n");
printf(" SA : ");
ipsec_hexdump((caddr_t)isr->sa->proxy,
_SALENBYAF(isr->sa->proxy->sa_family));
printf("\n");
#endif /* defined(IPSEC_DEBUG) */
printf("ipsec4_output: applyed SP's proxy.\n");
}
ip = mtod(state->m, struct ip *);
#if 0 /* XXX */
if (!key_checktunnelsanity(isr->sa, AF_INET,
(caddr_t)&ip->ip_src,
(caddr_t)&ip->ip_dst)) {
printf("ipsec4_output: internal error: "
"ipsec packet does not match SAD/SPD: "
"%x->%x, SPI=%u\n",
(u_int32_t)ntohl(ip->ip_src.s_addr),
(u_int32_t)ntohl(ip->ip_dst.s_addr),
(u_int32_t)ntohl(isr->sa->spi));
splx(s);
error = EINVAL;
goto bad;
}
#endif
state->m = ipsec4_splithdr(state->m);
if (!state->m) {
splx(s);
error = ENOMEM;
goto bad;
}
error = ipsec4_encapsulate(state->m, isr->sa);
splx(s);
if (error) {
state->m = NULL;
goto bad;
}
ip = mtod(state->m, struct ip *);
state->ro = &isr->sa->saidx->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);
bzero((caddr_t)state->ro, sizeof (*state->ro));
}
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;
}
ia = (struct in_ifaddr *)(state->ro->ro_rt->rt_ifa);
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;
}
ip->ip_src = IA_SIN(ia)->sin_addr;
} else
splx(s);
state->m = ipsec4_splithdr(state->m);
if (!state->m) {
error = ENOMEM;
goto bad;
}
switch (isr->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:
printf("ipsec4_output: unknown ipsec protocol %d\n", isr->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;
}
#ifdef INET6
/*
* 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");
if (!state->m)
panic("state->m == NULL in ipsec6_output");
if (!nexthdrp)
panic("nexthdrp == NULL in ipsec6_output");
if (!mprev)
panic("mprev == NULL in ipsec6_output");
if (!sp)
panic("sp == NULL in ipsec6_output");
if (!tun)
panic("tun == NULL in ipsec6_output");
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("ipsec6_output: applyed SP\n");
kdebug_secpolicy(sp));
*tun = 0;
for (isr = sp->req; isr; isr = isr->next) {
if (isr->mode == IPSEC_MODE_TUNNEL) {
/* the rest will be handled by ipsec6_output_tunnel() */
break;
}
if (key_checkrequest(isr) == 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->sa == NULL) {
switch (isr->level) {
case IPSEC_LEVEL_USE:
continue;
case IPSEC_LEVEL_REQUIRE:
/* must be not reached here. */
panic("ipsec6_output: no SA found, but required.");
}
}
if (isr->sa->state != SADB_SASTATE_MATURE
&& isr->sa->state != SADB_SASTATE_DYING) {
/* If there is no valid SA, we give up to process. */
ipsec6stat.out_nosa++;
error = EINVAL;
goto bad;
}
switch (isr->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:
printf("ipsec6_output_trans: unknown ipsec protocol %d\n", isr->proto);
m_freem(state->m);
error = EINVAL;
break;
}
if (error) {
state->m = NULL;
goto bad;
}
plen = state->m->m_pkthdr.len - sizeof(struct ip6_hdr);
if (plen > IPV6_MAXPACKET) {
printf("ipsec6_output: 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 in6_addr *ia6;
struct sockaddr_in6* dst6;
int s;
if (!state)
panic("state == NULL in ipsec6_output");
if (!state->m)
panic("state->m == NULL in ipsec6_output");
if (!sp)
panic("sp == NULL in ipsec6_output");
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->mode == IPSEC_MODE_TUNNEL)
break;
}
for (/*already initialized*/; isr; isr = isr->next) {
if (key_checkrequest(isr) == 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->sa == NULL) {
switch (isr->level) {
case IPSEC_LEVEL_USE:
continue;
case IPSEC_LEVEL_REQUIRE:
/* must be not reached here. */
panic("ipsec6_output_tunnel: no SA found, but required.");
}
}
if (isr->sa->state != SADB_SASTATE_MATURE
&& isr->sa->state != SADB_SASTATE_DYING) {
/* If there is no valid SA, we give up to process. */
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().
*/
#ifdef __NetBSD__
s = splsoftnet();
#else
s = splnet();
#endif
if (isr->mode == IPSEC_MODE_TUNNEL && isr->proxy) {
/*
* build IPsec tunnel.
*/
/* XXX should be processed with other familiy */
if (isr->proxy->sa_family != AF_INET6) {
printf("ipsec6_output_tunnel: "
"wrong proxy specified for spi=%u\n",
(u_int32_t)ntohl(isr->sa->spi));
splx(s);
error = EAFNOSUPPORT;
goto bad;
}
/* validity check */
if (isr->proxy->sa_family != isr->sa->proxy->sa_family
|| bcmp(_INADDRBYSA(isr->proxy),
_INADDRBYSA(isr->sa->proxy),
_INALENBYAF(isr->proxy->sa_family)) != 0) {
printf("ipsec6_output_tunnel: proxy address mismatch.\n");
#if defined(IPSEC_DEBUG)
printf(" SP: ");
ipsec_hexdump((caddr_t)isr->proxy,
_SALENBYAF(isr->proxy->sa_family));
printf("\n");
printf(" SA : ");
ipsec_hexdump((caddr_t)isr->sa->proxy,
_SALENBYAF(isr->sa->proxy->sa_family));
printf("\n");
#endif /* defined(IPSEC_DEBUG) */
printf("ipsec6_output_tunnel: applyed SP's proxy.\n");
}
ip6 = mtod(state->m, struct ip6_hdr *);
#if 0 /* XXX */
if (!key_checktunnelsanity(isr->sa, AF_INET6,
(caddr_t)&ip6->ip6_src,
(caddr_t)&ip6->ip6_dst)) {
printf("ipsec6_output_tunnel: internal error: "
"ipsec packet does not match SAD/SPD: "
"SPI=%u\n",
(u_int32_t)ntohl(isr->sa->spi));
splx(s);
error = EINVAL;
goto bad;
}
#endif
state->m = ipsec6_splithdr(state->m);
if (!state->m) {
splx(s);
error = ENOMEM;
goto bad;
}
error = ipsec6_encapsulate(state->m, isr->sa);
splx(s);
if (error) {
state->m = 0;
goto bad;
}
ip6 = mtod(state->m, struct ip6_hdr *);
state->ro = &isr->sa->saidx->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) == 0
|| !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
RTFREE(state->ro->ro_rt);
bzero((caddr_t)state->ro, sizeof (*state->ro));
}
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++;
error = EHOSTUNREACH;
goto bad;
}
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;
}
ia6 = in6_selectsrc(dst6, NULL, NULL, (struct route_in6 *)state->ro, &error);
if (ia6 == NULL)
goto bad;
ip6->ip6_src = *ia6;
} else
splx(s);
state->m = ipsec6_splithdr(state->m);
if (!state->m) {
error = ENOMEM;
goto bad;
}
ip6 = mtod(state->m, struct ip6_hdr *);
switch (isr->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;
default:
printf("ipsec6_output_tunnel: unknown ipsec protocol %d\n", isr->proto);
m_freem(state->m);
error = EINVAL;
break;
}
if (error) {
state->m = NULL;
goto bad;
}
plen = state->m->m_pkthdr.len - sizeof(struct ip6_hdr);
if (plen > IPV6_MAXPACKET) {
printf("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*/
/*
* 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_COPY_PKTHDR(mh, m);
MH_ALIGN(mh, hlen);
m->m_flags &= ~M_PKTHDR;
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;
}
#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_COPY_PKTHDR(mh, m);
MH_ALIGN(mh, hlen);
m->m_flags &= ~M_PKTHDR;
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(ip, nxt0, sa)
struct ip *ip;
u_int nxt0;
struct secas *sa;
{
u_int8_t nxt = nxt0 & 0xff;
struct sockaddr_in *sin;
int hlen;
if (nxt != IPPROTO_IPV4)
return 0;
#ifdef _IP_VHL
hlen = _IP_VHL_HL(ip->ip_vhl) << 2;
#else
hlen = ip->ip_hl << 2;
#endif
if (hlen != sizeof(struct ip))
return 0;
if (sa->proxy == NULL)
return 0;
switch (sa->proxy->sa_family) {
case AF_INET:
sin = (struct sockaddr_in *)sa->proxy;
if (bcmp(&ip->ip_dst, &sin->sin_addr, sizeof(ip->ip_dst)) != 0)
return 0;
break;
#ifdef INET6
case AF_INET6:
/* should be supported, but at this moment we don't. */
/*FALLTHROUGH*/
#endif
default:
return 0;
}
return 1;
}
#ifdef INET6
/* validate inbound IPsec tunnel packet. */
int
ipsec6_tunnel_validate(ip6, nxt0, sa)
struct ip6_hdr *ip6;
u_int nxt0;
struct secas *sa;
{
u_int8_t nxt = nxt0 & 0xff;
struct sockaddr_in6 *sin6;
if (nxt != IPPROTO_IPV6)
return 0;
if (sa->proxy == NULL)
return 0;
switch (sa->proxy->sa_family) {
case AF_INET6:
sin6 = (struct sockaddr_in6 *)sa->proxy;
if (!IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6->sin6_addr))
return 0;
break;
case AF_INET:
/* should be supported, but at this moment we don't. */
/*FALLTHROUGH*/
default:
return 0;
}
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 are more than one references
* to the cluster.
* XXX: is this approach effective?
*/
if (
#ifdef __bsdi__
n->m_ext.ext_func ||
#else
n->m_ext.ext_free ||
#endif
#ifdef __NetBSD__
MCLISREFERENCED(n)
#else
mclrefcnt[mtocl(n->m_ext.ext_buf)] > 1
#endif
)
{
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;
mnew->m_flags = n->m_flags & M_COPYFLAGS;
}
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;
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);
}
#ifdef __bsdi__
/*
* System control for IP
*/
u_char ipsecctlerrmap[PRC_NCMDS] = {
0, 0, 0, 0,
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
EMSGSIZE, EHOSTUNREACH, 0, 0,
0, 0, 0, 0,
ENOPROTOOPT
};
int *ipsec_sysvars[] = IPSECCTL_VARS;
int
ipsec_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
{
if (name[0] >= IPSECCTL_MAXID)
return (EOPNOTSUPP);
switch (name[0]) {
case IPSECCTL_STATS:
return sysctl_rdtrunc(oldp, oldlenp, newp, &ipsecstat,
sizeof(ipsecstat));
case IPSECCTL_DEF_POLICY:
if (newp != NULL && newlen == sizeof(int)) {
switch (*(int *)newp) {
case IPSEC_POLICY_DISCARD:
case IPSEC_POLICY_NONE:
break;
default:
return EINVAL;
}
}
return (sysctl_int_arr(ipsec_sysvars, name, namelen,
oldp, oldlenp, newp, newlen));
case IPSECCTL_DEF_ESP_TRANSLEV:
case IPSECCTL_DEF_ESP_NETLEV:
case IPSECCTL_DEF_AH_TRANSLEV:
case IPSECCTL_DEF_AH_NETLEV:
if (newp != NULL && newlen == sizeof(int)) {
switch (*(int *)newp) {
case IPSEC_LEVEL_USE:
case IPSEC_LEVEL_REQUIRE:
break;
default:
return EINVAL;
}
}
return (sysctl_int_arr(ipsec_sysvars, name, namelen,
oldp, oldlenp, newp, newlen));
default:
return (sysctl_int_arr(ipsec_sysvars, name, namelen,
oldp, oldlenp, newp, newlen));
}
}
#ifdef INET6
/*
* System control for IP6
*/
u_char ipsec6ctlerrmap[PRC_NCMDS] = {
0, 0, 0, 0,
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
EMSGSIZE, EHOSTUNREACH, 0, 0,
0, 0, 0, 0,
ENOPROTOOPT
};
int *ipsec6_sysvars[] = IPSEC6CTL_VARS;
int
ipsec6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
{
if (name[0] >= IPSECCTL_MAXID) /* xxx no 6 in this definition */
return (EOPNOTSUPP);
switch (name[0]) {
case IPSECCTL_STATS: /* xxx no 6 in this definition */
return sysctl_rdtrunc(oldp, oldlenp, newp, &ipsec6stat,
sizeof(ipsec6stat));
case IPSECCTL_DEF_POLICY:
if (newp != NULL && newlen == sizeof(int)) {
switch (*(int *)newp) {
case IPSEC_POLICY_DISCARD:
case IPSEC_POLICY_NONE:
break;
default:
return EINVAL;
}
}
return (sysctl_int_arr(ipsec6_sysvars, name, namelen,
oldp, oldlenp, newp, newlen));
case IPSECCTL_DEF_ESP_TRANSLEV:
case IPSECCTL_DEF_ESP_NETLEV:
case IPSECCTL_DEF_AH_TRANSLEV:
case IPSECCTL_DEF_AH_NETLEV:
if (newp != NULL && newlen == sizeof(int)) {
switch (*(int *)newp) {
case IPSEC_LEVEL_USE:
case IPSEC_LEVEL_REQUIRE:
break;
default:
return EINVAL;
}
}
return (sysctl_int_arr(ipsec6_sysvars, name, namelen,
oldp, oldlenp, newp, newlen));
default:
return (sysctl_int_arr(ipsec6_sysvars, name, namelen,
oldp, oldlenp, newp, newlen));
}
}
#endif /*INET6*/
#endif /*__bsdi__*/
#ifdef __NetBSD__
/*
* System control for IPSEC
*/
u_char ipsecctlermap[PRC_NCMDS] = {
0, 0, 0, 0,
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
EMSGSIZE, EHOSTUNREACH, 0, 0,
0, 0, 0, 0,
ENOPROTOOPT
};
int *ipsec_sysvars[] = IPSECCTL_VARS;
int
ipsec_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
{
/* All sysctl names at this level are terminal. */
if (namelen != 1)
return ENOTDIR;
/* common sanity checks */
switch (name[0]) {
case IPSECCTL_DEF_ESP_TRANSLEV:
case IPSECCTL_DEF_ESP_NETLEV:
case IPSECCTL_DEF_AH_TRANSLEV:
case IPSECCTL_DEF_AH_NETLEV:
if (newp != NULL && newlen == sizeof(int)) {
switch (*(int *)newp) {
case IPSEC_LEVEL_USE:
case IPSEC_LEVEL_REQUIRE:
break;
default:
return EINVAL;
}
}
}
switch (name[0]) {
case IPSECCTL_STATS:
return sysctl_struct(oldp, oldlenp, newp, newlen,
&ipsecstat, sizeof(ipsecstat));
case IPSECCTL_DEF_POLICY:
if (newp != NULL && newlen == sizeof(int)) {
switch (*(int *)newp) {
case IPSEC_POLICY_DISCARD:
case IPSEC_POLICY_NONE:
break;
default:
return EINVAL;
}
}
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip4_def_policy.policy);
case IPSECCTL_DEF_ESP_TRANSLEV:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip4_esp_trans_deflev);
case IPSECCTL_DEF_ESP_NETLEV:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip4_esp_net_deflev);
case IPSECCTL_DEF_AH_TRANSLEV:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip4_ah_trans_deflev);
case IPSECCTL_DEF_AH_NETLEV:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip4_ah_net_deflev);
case IPSECCTL_INBOUND_CALL_IKE:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip4_inbound_call_ike);
case IPSECCTL_AH_CLEARTOS:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip4_ah_cleartos);
case IPSECCTL_AH_OFFSETMASK:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip4_ah_offsetmask);
case IPSECCTL_DFBIT:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip4_ipsec_dfbit);
case IPSECCTL_ECN:
return sysctl_int(oldp, oldlenp, newp, newlen, &ip4_ipsec_ecn);
default:
return EOPNOTSUPP;
}
/* NOTREACHED */
}
#ifdef INET6
/*
* System control for IPSEC6
*/
u_char ipsec6ctlermap[PRC_NCMDS] = {
0, 0, 0, 0,
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
EMSGSIZE, EHOSTUNREACH, 0, 0,
0, 0, 0, 0,
ENOPROTOOPT
};
int *ipsec6_sysvars[] = IPSEC6CTL_VARS;
int
ipsec6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
{
/* All sysctl names at this level are terminal. */
if (namelen != 1)
return ENOTDIR;
/* common sanity checks */
switch (name[0]) {
case IPSECCTL_DEF_ESP_TRANSLEV:
case IPSECCTL_DEF_ESP_NETLEV:
case IPSECCTL_DEF_AH_TRANSLEV:
case IPSECCTL_DEF_AH_NETLEV:
if (newp != NULL && newlen == sizeof(int)) {
switch (*(int *)newp) {
case IPSEC_LEVEL_USE:
case IPSEC_LEVEL_REQUIRE:
break;
default:
return EINVAL;
}
}
}
switch (name[0]) {
case IPSECCTL_STATS:
return sysctl_struct(oldp, oldlenp, newp, newlen,
&ipsec6stat, sizeof(ipsec6stat));
case IPSECCTL_DEF_POLICY:
if (newp != NULL && newlen == sizeof(int)) {
switch (*(int *)newp) {
case IPSEC_POLICY_DISCARD:
case IPSEC_POLICY_NONE:
break;
default:
return EINVAL;
}
}
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_def_policy.policy);
case IPSECCTL_DEF_ESP_TRANSLEV:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_esp_trans_deflev);
case IPSECCTL_DEF_ESP_NETLEV:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_esp_net_deflev);
case IPSECCTL_DEF_AH_TRANSLEV:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_ah_trans_deflev);
case IPSECCTL_DEF_AH_NETLEV:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_ah_net_deflev);
case IPSECCTL_INBOUND_CALL_IKE:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_inbound_call_ike);
case IPSECCTL_ECN:
return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_ipsec_ecn);
default:
return EOPNOTSUPP;
}
/* NOTREACHED */
}
#endif /*INET6*/
#endif /* __NetBSD__ */
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