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84ca76709f
freebsd/sys/netkey/key.c
Hajimu UMEMOTO b1a6f1d8a2 SADB_UPDATE did not return an error when key length is invalid. 
Obtained from:	KAME
2005-08-22 07:05:14 +00:00

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/* $KAME: key.c,v 1.308 2003/09/07 20:35:59 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* This code is referd to RFC 2367
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/route.h>
#include <net/raw_cb.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_var.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/ip6_var.h>
#include <netinet6/scope6_var.h>
#endif /* INET6 */
#ifdef INET
#include <netinet/in_pcb.h>
#endif
#ifdef INET6
#include <netinet6/in6_pcb.h>
#endif /* INET6 */
#include <net/pfkeyv2.h>
#include <netkey/keydb.h>
#include <netkey/key.h>
#include <netkey/keysock.h>
#include <netkey/key_debug.h>
#include <netinet6/ipsec.h>
#ifdef INET6
#include <netinet6/ipsec6.h>
#endif
#include <netinet6/ah.h>
#ifdef INET6
#include <netinet6/ah6.h>
#endif
#ifdef IPSEC_ESP
#include <netinet6/esp.h>
#ifdef INET6
#include <netinet6/esp6.h>
#endif
#endif
#include <netinet6/ipcomp.h>
#ifdef INET6
#include <netinet6/ipcomp6.h>
#endif
#include <machine/stdarg.h>
/* randomness */
#include <sys/random.h>
#include <net/net_osdep.h>
#ifndef satosin
#define satosin(s) ((struct sockaddr_in *)s)
#endif
#define FULLMASK 0xff
/*
* Note on SA reference counting:
* - SAs that are not in DEAD state will have (total external reference + 1)
* following value in reference count field. they cannot be freed and are
* referenced from SA header.
* - SAs that are in DEAD state will have (total external reference)
* in reference count field. they are ready to be freed. reference from
* SA header will be removed in keydb_delsecasvar(), when the reference count
* field hits 0 (= no external reference other than from SA header.
*/
u_int32_t key_debug_level = 0;
static u_int key_spi_trycnt = 1000;
static u_int32_t key_spi_minval = 0x100;
static u_int32_t key_spi_maxval = 0x0fffffff; /* XXX */
static u_int key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/
static int key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/
static int key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/
static int key_preferred_oldsa = 1; /* preferred old sa rather than new sa.*/
static u_int32_t acq_seq = 0;
struct _satailq satailq; /* list of all SAD entry */
struct _sptailq sptailq; /* SPD table + pcb */
static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD table */
static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */
static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1];
/* registed list */
#define SPIHASHSIZE 128
#define SPIHASH(x) (((x) ^ ((x) >> 16)) % SPIHASHSIZE)
static LIST_HEAD(_spihash, secasvar) spihash[SPIHASHSIZE];
#ifndef IPSEC_NONBLOCK_ACQUIRE
static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */
#endif
static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */
struct key_cb key_cb;
/* search order for SAs */
static const u_int saorder_state_valid_prefer_old[] = {
SADB_SASTATE_DYING, SADB_SASTATE_MATURE,
};
static const u_int saorder_state_valid_prefer_new[] = {
SADB_SASTATE_MATURE, SADB_SASTATE_DYING,
};
static const u_int saorder_state_alive[] = {
/* except DEAD */
SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL
};
static const u_int saorder_state_any[] = {
SADB_SASTATE_MATURE, SADB_SASTATE_DYING,
SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD
};
static const int minsize[] = {
sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
sizeof(struct sadb_sa), /* SADB_EXT_SA */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */
sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */
sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */
sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */
sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */
sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */
sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */
sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */
sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */
sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */
sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */
sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
0, /* SADB_X_EXT_KMPRIVATE */
sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */
sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
};
static const int maxsize[] = {
sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
sizeof(struct sadb_sa), /* SADB_EXT_SA */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
0, /* SADB_EXT_ADDRESS_SRC */
0, /* SADB_EXT_ADDRESS_DST */
0, /* SADB_EXT_ADDRESS_PROXY */
0, /* SADB_EXT_KEY_AUTH */
0, /* SADB_EXT_KEY_ENCRYPT */
0, /* SADB_EXT_IDENTITY_SRC */
0, /* SADB_EXT_IDENTITY_DST */
0, /* SADB_EXT_SENSITIVITY */
0, /* SADB_EXT_PROPOSAL */
0, /* SADB_EXT_SUPPORTED_AUTH */
0, /* SADB_EXT_SUPPORTED_ENCRYPT */
sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
0, /* SADB_X_EXT_KMPRIVATE */
0, /* SADB_X_EXT_POLICY */
sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
};
static int ipsec_esp_keymin = 256;
#ifdef IPSEC_ESP
static int ipsec_esp_auth = 0;
#endif
static int ipsec_ah_keymin = 128;
SYSCTL_DECL(_net_key);
SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, CTLFLAG_RW, \
&key_debug_level, 0, "");
/* max count of trial for the decision of spi value */
SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, CTLFLAG_RW, \
&key_spi_trycnt, 0, "");
/* minimum spi value to allocate automatically. */
SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval, CTLFLAG_RW, \
&key_spi_minval, 0, "");
/* maximun spi value to allocate automatically. */
SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval, CTLFLAG_RW, \
&key_spi_maxval, 0, "");
/* lifetime for larval SA */
SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime, CTLFLAG_RW, \
&key_larval_lifetime, 0, "");
/* counter for blocking to send SADB_ACQUIRE to IKEd */
SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count, CTLFLAG_RW, \
&key_blockacq_count, 0, "");
/* lifetime for blocking to send SADB_ACQUIRE to IKEd */
SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime, CTLFLAG_RW, \
&key_blockacq_lifetime, 0, "");
#ifdef IPSEC_ESP
/* ESP auth */
SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, CTLFLAG_RW, \
&ipsec_esp_auth, 0, "ESP auth");
#endif
/* minimum ESP key length */
SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin, CTLFLAG_RW, \
&ipsec_esp_keymin, 0, "");
/* minimum AH key length */
SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, CTLFLAG_RW, \
&ipsec_ah_keymin, 0, "");
/* perfered old SA rather than new SA */
SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, preferred_oldsa, CTLFLAG_RW,\
&key_preferred_oldsa, 0, "");
#define __LIST_CHAINED(elm) \
(!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL))
#define LIST_INSERT_TAIL(head, elm, type, field) \
do {\
struct type *curelm = LIST_FIRST(head); \
if (curelm == NULL) {\
LIST_INSERT_HEAD(head, elm, field); \
} else { \
while (LIST_NEXT(curelm, field)) \
curelm = LIST_NEXT(curelm, field);\
LIST_INSERT_AFTER(curelm, elm, field);\
}\
} while (/*CONSTCOND*/ 0)
#define KEY_CHKSASTATE(head, sav, name) \
do { \
if ((head) != (sav)) { \
ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%u SA=%u)\n", \
(name), (head), (sav))); \
continue; \
} \
} while (/*CONSTCOND*/ 0)
#define KEY_CHKSPDIR(head, sp, name) \
do { \
if ((head) != (sp)) { \
ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%u SP=%u), " \
"anyway continue.\n", \
(name), (head), (sp))); \
} \
} while (/*CONSTCOND*/ 0)
#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 (/*CONSTCOND*/ 0)
#define KFREE(p) \
do { \
printf("%s %d: %p -> KFREE()\n", __FILE__, __LINE__, (p)); \
free((caddr_t)(p), M_SECA); \
} while (/*CONSTCOND*/ 0)
#endif
/*
* set parameters into secpolicyindex buffer.
* Must allocate secpolicyindex buffer passed to this function.
*/
#define KEY_SETSECSPIDX(s, d, ps, pd, ulp, idx) \
do { \
bzero((idx), sizeof(struct secpolicyindex)); \
(idx)->prefs = (ps); \
(idx)->prefd = (pd); \
(idx)->ul_proto = (ulp); \
bcopy((s), &(idx)->src, ((struct sockaddr *)(s))->sa_len); \
bcopy((d), &(idx)->dst, ((struct sockaddr *)(d))->sa_len); \
} while (/*CONSTCOND*/ 0)
/*
* set parameters into secasindex buffer.
* Must allocate secasindex buffer before calling this function.
*/
#define KEY_SETSECASIDX(p, m, r, s, d, idx) \
do { \
bzero((idx), sizeof(struct secasindex)); \
(idx)->proto = (p); \
(idx)->mode = (m); \
(idx)->reqid = (r); \
bcopy((s), &(idx)->src, ((struct sockaddr *)(s))->sa_len); \
bcopy((d), &(idx)->dst, ((struct sockaddr *)(d))->sa_len); \
} while (/*CONSTCOND*/ 0)
/* key statistics */
struct _keystat {
u_long getspi_count; /* the avarage of count to try to get new SPI */
} keystat;
struct sadb_msghdr {
struct sadb_msg *msg;
struct sadb_ext *ext[SADB_EXT_MAX + 1];
int extoff[SADB_EXT_MAX + 1];
int extlen[SADB_EXT_MAX + 1];
};
static struct secasvar *key_allocsa_policy(struct secasindex *);
static struct secasvar *key_do_allocsa_policy(struct secashead *, u_int);
static void key_delsav(struct secasvar *);
static void key_delsp(struct secpolicy *);
static struct secpolicy *key_getsp(struct secpolicyindex *, int);
static struct secpolicy *key_getspbyid(u_int32_t);
static u_int32_t key_newreqid(void);
static struct mbuf *key_gather_mbuf(struct mbuf *,
const struct sadb_msghdr *, int, int, ...);
static int key_spdadd(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_spddelete(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_spddelete2(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_spdget(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_spdflush(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_spddump(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static struct mbuf *key_setdumpsp(struct secpolicy *,
u_int8_t, u_int32_t, u_int32_t);
static u_int key_getspreqmsglen(struct secpolicy *);
static int key_spdexpire(struct secpolicy *);
static struct secashead *key_newsah(struct secasindex *);
static void key_delsah(struct secashead *);
static struct secasvar *key_newsav(struct mbuf *,
const struct sadb_msghdr *, struct secashead *, int *);
static struct secashead *key_getsah(struct secasindex *);
static struct secasvar *key_checkspidup(struct secasindex *, u_int32_t);
static void key_setspi(struct secasvar *, u_int32_t);
static struct secasvar *key_getsavbyspi(struct secashead *, u_int32_t);
static int key_setsaval(struct secasvar *, struct mbuf *,
const struct sadb_msghdr *);
static int key_mature(struct secasvar *);
static struct mbuf *key_setdumpsa(struct secasvar *, u_int8_t,
u_int8_t, u_int32_t, u_int32_t);
static struct mbuf *key_setsadbmsg(u_int8_t, u_int16_t, u_int8_t,
u_int32_t, pid_t, u_int16_t);
static struct mbuf *key_setsadbsa(struct secasvar *);
static struct mbuf *key_setsadbaddr(u_int16_t,
struct sockaddr *, u_int8_t, u_int16_t);
#if 0
static struct mbuf *key_setsadbident(u_int16_t, u_int16_t, caddr_t,
int, u_int64_t);
#endif
static struct mbuf *key_setsadbxsa2(u_int8_t, u_int32_t, u_int32_t);
static struct mbuf *key_setsadblifetime(u_int16_t, u_int32_t,
u_int64_t, u_int64_t, u_int64_t);
static struct mbuf *key_setsadbxpolicy(u_int16_t, u_int8_t,
u_int32_t);
static void *key_newbuf(const void *, u_int);
static int key_ismyaddr(struct sockaddr *);
#ifdef INET6
static int key_ismyaddr6(struct sockaddr_in6 *);
#endif
/* flags for key_cmpsaidx() */
#define CMP_HEAD 1 /* protocol, addresses. */
#define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */
#define CMP_REQID 3 /* additionally HEAD, reqid. not used */
#define CMP_EXACTLY 4 /* all elements. */
static int key_cmpsaidx(struct secasindex *, struct secasindex *, int);
static int key_sockaddrcmp(struct sockaddr *, struct sockaddr *, int);
static int key_bbcmp(caddr_t, caddr_t, u_int);
static u_long key_random(void);
static u_int16_t key_satype2proto(u_int8_t);
static u_int8_t key_proto2satype(u_int16_t);
static int key_getspi(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static u_int32_t key_do_getnewspi(struct sadb_spirange *,
struct secasindex *);
static int key_update(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
#ifdef IPSEC_DOSEQCHECK
static struct secasvar *key_getsavbyseq(struct secashead *, u_int32_t);
#endif
static int key_add(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_setident(struct secashead *, struct mbuf *,
const struct sadb_msghdr *);
static struct mbuf *key_getmsgbuf_x1(struct mbuf *,
const struct sadb_msghdr *);
static int key_delete(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_get(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static void key_getcomb_setlifetime(struct sadb_comb *);
#ifdef IPSEC_ESP
static struct mbuf *key_getcomb_esp(void);
#endif
static struct mbuf *key_getcomb_ah(void);
static struct mbuf *key_getcomb_ipcomp(void);
static struct mbuf *key_getprop(const struct secasindex *);
static int key_acquire(struct secasindex *, struct secpolicy *);
#ifndef IPSEC_NONBLOCK_ACQUIRE
static struct secacq *key_newacq(struct secasindex *);
static struct secacq *key_getacq(struct secasindex *);
static struct secacq *key_getacqbyseq(u_int32_t);
#endif
static struct secspacq *key_newspacq(struct secpolicyindex *);
static struct secspacq *key_getspacq(struct secpolicyindex *);
static int key_acquire2(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_register(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_expire(struct secasvar *);
static int key_flush(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_dump(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_promisc(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_senderror(struct socket *, struct mbuf *, int);
static int key_validate_ext(struct sadb_ext *, int);
static int key_align(struct mbuf *, struct sadb_msghdr *);
#if 0
static const char *key_getfqdn(void);
static const char *key_getuserfqdn(void);
#endif
static void key_sa_chgstate(struct secasvar *, u_int8_t);
static void key_sp_dead(struct secpolicy *);
static void key_sp_unlink(struct secpolicy *);
static struct mbuf *key_alloc_mbuf(int);
static struct callout key_timehandler_ch;
/* %%% IPsec policy management */
/*
* allocating a SP for OUTBOUND or INBOUND packet.
* Must call key_freesp() later.
* OUT: NULL: not found
* others: found and return the pointer.
*/
struct secpolicy *
key_allocsp(tag, spidx, dir)
u_int16_t tag;
struct secpolicyindex *spidx;
u_int dir;
{
struct secpolicy *sp;
int s;
/* check direction */
switch (dir) {
case IPSEC_DIR_INBOUND:
case IPSEC_DIR_OUTBOUND:
break;
default:
panic("key_allocsp: Invalid direction is passed.");
}
/* get a SP entry */
s = splnet(); /*called from softclock()*/
if (spidx) {
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("*** objects\n");
kdebug_secpolicyindex(spidx));
}
LIST_FOREACH(sp, &sptree[dir], chain) {
if (sp->state == IPSEC_SPSTATE_DEAD)
continue;
if (sp->spidx) {
if (!spidx)
continue;
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("*** in SPD\n");
kdebug_secpolicyindex(sp->spidx));
if (key_cmpspidx_withmask(sp->spidx, spidx))
goto found;
}
}
splx(s);
return NULL;
found:
/* sanity check */
KEY_CHKSPDIR(sp->dir, dir, "key_allocsp");
/* found a SPD entry */
sp->lastused = time_second;
sp->refcnt++;
splx(s);
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP key_allocsp cause refcnt++:%d SP:%p\n",
sp->refcnt, sp));
return sp;
}
/*
* return a policy that matches this particular inbound packet.
* XXX slow
*/
struct secpolicy *
key_gettunnel(osrc, odst, isrc, idst)
struct sockaddr *osrc, *odst, *isrc, *idst;
{
struct secpolicy *sp;
const int dir = IPSEC_DIR_INBOUND;
int s;
struct ipsecrequest *r1, *r2, *p;
struct sockaddr *os, *od, *is, *id;
struct secpolicyindex spidx;
if (isrc->sa_family != idst->sa_family) {
ipseclog((LOG_ERR, "protocol family mismatched %u != %u\n",
isrc->sa_family, idst->sa_family));
return NULL;
}
s = splnet(); /*called from softclock()*/
LIST_FOREACH(sp, &sptree[dir], chain) {
if (sp->state == IPSEC_SPSTATE_DEAD)
continue;
r1 = r2 = NULL;
for (p = sp->req; p; p = p->next) {
if (p->saidx.mode != IPSEC_MODE_TUNNEL)
continue;
r1 = r2;
r2 = p;
if (!r1) {
if (sp->spidx) {
/*
* here we look at address matches
* only
*/
spidx = *sp->spidx;
if (isrc->sa_len > sizeof(spidx.src) ||
idst->sa_len > sizeof(spidx.dst))
continue;
bcopy(isrc, &spidx.src, isrc->sa_len);
bcopy(idst, &spidx.dst, idst->sa_len);
if (!key_cmpspidx_withmask(sp->spidx,
&spidx))
continue;
} else
; /* can't check for tagged policy */
} else {
is = (struct sockaddr *)&r1->saidx.src;
id = (struct sockaddr *)&r1->saidx.dst;
if (key_sockaddrcmp(is, isrc, 0) ||
key_sockaddrcmp(id, idst, 0))
continue;
}
os = (struct sockaddr *)&r2->saidx.src;
od = (struct sockaddr *)&r2->saidx.dst;
if (key_sockaddrcmp(os, osrc, 0) ||
key_sockaddrcmp(od, odst, 0))
continue;
goto found;
}
}
splx(s);
return NULL;
found:
sp->lastused = time_second;
sp->refcnt++;
splx(s);
return sp;
}
/*
* allocating an SA entry for an *OUTBOUND* packet.
* checking each request entries in SP, and acquire an SA if need.
* OUT: 0: there are valid requests.
* ENOENT: policy may be valid, but SA with REQUIRE is on acquiring.
*/
int
key_checkrequest(isr, saidx)
struct ipsecrequest *isr;
struct secasindex *saidx;
{
u_int level;
int error;
/* sanity check */
if (isr == NULL || saidx == NULL)
panic("key_checkrequest: NULL pointer is passed.");
/* check mode */
switch (saidx->mode) {
case IPSEC_MODE_TRANSPORT:
case IPSEC_MODE_TUNNEL:
break;
case IPSEC_MODE_ANY:
default:
panic("key_checkrequest: Invalid policy defined.");
}
/* get current level */
level = ipsec_get_reqlevel(isr, saidx->src.ss_family);
#if 0
/*
* We do allocate new SA only if the state of SA in the holder is
* SADB_SASTATE_DEAD. The SA for outbound must be the oldest.
*/
if (isr->sav != NULL) {
if (isr->sav->sah == NULL)
panic("key_checkrequest: sah is null.");
if (isr->sav ==
LIST_FIRST(&isr->sav->sah->savtree[SADB_SASTATE_DEAD])) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP checkrequest calls free SA:%p\n",
isr->sav));
key_freesav(isr->sav);
isr->sav = NULL;
}
}
#else
/*
* we free any SA stashed in the IPsec request because a different
* SA may be involved each time this request is checked, either
* because new SAs are being configured, or this request is
* associated with an unconnected datagram socket, or this request
* is associated with a system default policy.
*
* The operation may have negative impact to performance. We may
* want to check cached SA carefully, rather than picking new SA
* every time.
*/
if (isr->sav != NULL) {
key_freesav(isr->sav);
isr->sav = NULL;
}
#endif
/*
* new SA allocation if no SA found.
* key_allocsa_policy should allocate the oldest SA available.
* See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt.
*/
if (isr->sav == NULL)
isr->sav = key_allocsa_policy(saidx);
/* When there is SA. */
if (isr->sav != NULL)
return 0;
/* there is no SA */
if ((error = key_acquire(saidx, isr->sp)) != 0) {
/* XXX What should I do ? */
ipseclog((LOG_DEBUG, "key_checkrequest: error %d returned "
"from key_acquire.\n", error));
return error;
}
return level == IPSEC_LEVEL_REQUIRE ? ENOENT : 0;
}
/*
* allocating a SA for policy entry from SAD.
* NOTE: searching SAD of aliving state.
* OUT: NULL: not found.
* others: found and return the pointer.
*/
static struct secasvar *
key_allocsa_policy(saidx)
struct secasindex *saidx;
{
struct secashead *sah;
struct secasvar *sav;
u_int stateidx, state;
const u_int *saorder_state_valid;
int arraysize;
LIST_FOREACH(sah, &sahtree, chain) {
if (sah->state == SADB_SASTATE_DEAD)
continue;
if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID))
goto found;
}
return NULL;
found:
/*
* search a valid state list for outbound packet.
* This search order is important.
*/
if (key_preferred_oldsa) {
saorder_state_valid = saorder_state_valid_prefer_old;
arraysize = _ARRAYLEN(saorder_state_valid_prefer_old);
} else {
saorder_state_valid = saorder_state_valid_prefer_new;
arraysize = _ARRAYLEN(saorder_state_valid_prefer_new);
}
for (stateidx = 0; stateidx < arraysize; stateidx++) {
state = saorder_state_valid[stateidx];
sav = key_do_allocsa_policy(sah, state);
if (sav != NULL)
return sav;
}
return NULL;
}
/*
* searching SAD with direction, protocol, mode and state.
* called by key_allocsa_policy().
* OUT:
* NULL : not found
* others : found, pointer to a SA.
*/
static struct secasvar *
key_do_allocsa_policy(sah, state)
struct secashead *sah;
u_int state;
{
struct secasvar *sav, *nextsav, *candidate, *d;
/* initilize */
candidate = NULL;
for (sav = LIST_FIRST(&sah->savtree[state]);
sav != NULL;
sav = nextsav) {
nextsav = LIST_NEXT(sav, chain);
/* sanity check */
KEY_CHKSASTATE(sav->state, state, "key_do_allocsa_policy");
/* initialize */
if (candidate == NULL) {
candidate = sav;
continue;
}
/* Which SA is the better ? */
/* sanity check 2 */
if (candidate->lft_c == NULL || sav->lft_c == NULL)
panic("key_do_allocsa_policy: "
"lifetime_current is NULL.");
/* What the best method is to compare ? */
if (key_preferred_oldsa) {
if (candidate->lft_c->sadb_lifetime_addtime >
sav->lft_c->sadb_lifetime_addtime) {
candidate = sav;
}
continue;
/*NOTREACHED*/
}
/* preferred new sa rather than old sa */
if (candidate->lft_c->sadb_lifetime_addtime <
sav->lft_c->sadb_lifetime_addtime) {
d = candidate;
candidate = sav;
} else
d = sav;
/*
* prepared to delete the SA when there is more
* suitable candidate and the lifetime of the SA is not
* permanent.
*/
if (d->lft_c->sadb_lifetime_addtime != 0) {
struct mbuf *m, *result = NULL;
key_sa_chgstate(d, SADB_SASTATE_DEAD);
m = key_setsadbmsg(SADB_DELETE, 0,
key_proto2satype(d->sah->saidx.proto),
0, 0, d->refcnt - 1);
if (!m)
goto msgfail;
result = m;
/* set sadb_address for saidx's. */
m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
(struct sockaddr *)&d->sah->saidx.src,
FULLMASK, IPSEC_ULPROTO_ANY);
if (!m)
goto msgfail;
m_cat(result, m);
/* set sadb_address for saidx's. */
m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
(struct sockaddr *)&d->sah->saidx.dst,
FULLMASK, IPSEC_ULPROTO_ANY);
if (!m)
goto msgfail;
m_cat(result, m);
/* create SA extension */
m = key_setsadbsa(d);
if (!m)
goto msgfail;
m_cat(result, m);
if (result->m_len < sizeof(struct sadb_msg)) {
result = m_pullup(result,
sizeof(struct sadb_msg));
if (result == NULL)
goto msgfail;
}
result->m_pkthdr.len = 0;
for (m = result; m; m = m->m_next)
result->m_pkthdr.len += m->m_len;
mtod(result, struct sadb_msg *)->sadb_msg_len =
PFKEY_UNIT64(result->m_pkthdr.len);
if (key_sendup_mbuf(NULL, result,
KEY_SENDUP_REGISTERED))
goto msgfail;
result = NULL;
msgfail:
if (result != NULL)
m_freem(result);
key_freesav(d);
}
}
if (candidate) {
candidate->refcnt++;
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP allocsa_policy cause "
"refcnt++:%d SA:%p\n",
candidate->refcnt, candidate));
}
return candidate;
}
/*
* allocating a SA entry for a *INBOUND* packet.
* Must call key_freesav() later.
* OUT: positive: pointer to a sav.
* NULL: not found, or error occured.
*
* In the comparison, source address will be ignored for RFC2401 conformance.
* To quote, from section 4.1:
* A security association is uniquely identified by a triple consisting
* of a Security Parameter Index (SPI), an IP Destination Address, and a
* security protocol (AH or ESP) identifier.
* Note that, however, we do need to keep source address in IPsec SA.
* IKE specification and PF_KEY specification do assume that we
* keep source address in IPsec SA. We see a tricky situation here.
*/
struct secasvar *
key_allocsa(family, src, dst, proto, spi)
u_int family, proto;
caddr_t src, dst;
u_int32_t spi;
{
struct secasvar *sav, *match;
u_int stateidx, state, tmpidx, matchidx;
struct sockaddr_in sin;
#ifdef INET6
struct sockaddr_in6 sin6;
#endif
int s;
const u_int *saorder_state_valid;
int arraysize;
/* sanity check */
if (src == NULL || dst == NULL)
panic("key_allocsa: NULL pointer is passed.");
/*
* when both systems employ similar strategy to use a SA.
* the search order is important even in the inbound case.
*/
if (key_preferred_oldsa) {
saorder_state_valid = saorder_state_valid_prefer_old;
arraysize = _ARRAYLEN(saorder_state_valid_prefer_old);
} else {
saorder_state_valid = saorder_state_valid_prefer_new;
arraysize = _ARRAYLEN(saorder_state_valid_prefer_new);
}
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
#ifdef INET6
bzero(&sin6, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(sin6);
#endif
/*
* searching SAD.
* XXX: to be checked internal IP header somewhere. Also when
* IPsec tunnel packet is received. But ESP tunnel mode is
* encrypted so we can't check internal IP header.
*/
s = splnet(); /*called from softclock()*/
/*
* search a valid state list for inbound packet.
* the search order is not important.
*/
match = NULL;
matchidx = arraysize;
LIST_FOREACH(sav, &spihash[SPIHASH(spi)], spihash) {
if (sav->spi != spi)
continue;
if (proto != sav->sah->saidx.proto)
continue;
if (family != sav->sah->saidx.src.ss_family ||
family != sav->sah->saidx.dst.ss_family)
continue;
tmpidx = arraysize;
for (stateidx = 0; stateidx < matchidx; stateidx++) {
state = saorder_state_valid[stateidx];
if (sav->state == state) {
tmpidx = stateidx;
break;
}
}
if (tmpidx >= matchidx)
continue;
#if 0 /* don't check src */
/* check src address */
switch (family) {
case AF_INET:
bcopy(src, &sin.sin_addr, sizeof(sin.sin_addr));
if (key_sockaddrcmp((struct sockaddr*)&sin,
(struct sockaddr *)&sav->sah->saidx.src, 0) != 0)
continue;
break;
#ifdef INET6
case AF_INET6:
bcopy(src, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
sin6.sin6_scope_id = 0;
if (sa6_recoverscope(&sin6))
continue;
if (key_sockaddrcmp((struct sockaddr *)&sin6,
(struct sockaddr *)&sav->sah->saidx.src, 0) != 0)
continue;
break;
#endif
default:
ipseclog((LOG_DEBUG, "key_allocsa: "
"unknown address family=%d.\n",
family));
continue;
}
#endif
/* check dst address */
switch (family) {
case AF_INET:
bcopy(dst, &sin.sin_addr, sizeof(sin.sin_addr));
if (key_sockaddrcmp((struct sockaddr*)&sin,
(struct sockaddr *)&sav->sah->saidx.dst, 0) != 0)
continue;
break;
#ifdef INET6
case AF_INET6:
bcopy(dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
sin6.sin6_scope_id = 0;
if (sa6_recoverscope(&sin6))
continue;
if (key_sockaddrcmp((struct sockaddr *)&sin6,
(struct sockaddr *)&sav->sah->saidx.dst, 0) != 0)
continue;
break;
#endif
default:
ipseclog((LOG_DEBUG, "key_allocsa: "
"unknown address family=%d.\n", family));
continue;
}
match = sav;
matchidx = tmpidx;
}
if (match)
goto found;
/* not found */
splx(s);
return NULL;
found:
match->refcnt++;
splx(s);
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP allocsa cause refcnt++:%d SA:%p\n",
match->refcnt, match));
return match;
}
/*
* Must be called after calling key_allocsp().
* For both the packet without socket and key_freeso().
*/
void
key_freesp(sp)
struct secpolicy *sp;
{
/* sanity check */
if (sp == NULL)
panic("key_freesp: NULL pointer is passed.");
sp->refcnt--;
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP freesp cause refcnt--:%d SP:%p\n",
sp->refcnt, sp));
if (sp->refcnt == 0)
key_delsp(sp);
return;
}
/*
* Must be called after calling key_allocsa().
* This function is called by key_freesp() to free some SA allocated
* for a policy.
*/
void
key_freesav(sav)
struct secasvar *sav;
{
/* sanity check */
if (sav == NULL)
panic("key_freesav: NULL pointer is passed.");
sav->refcnt--;
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP freesav cause refcnt--:%d SA:%p SPI %u\n",
sav->refcnt, sav, (u_int32_t)ntohl(sav->spi)));
if (sav->refcnt > 0)
return;
key_delsav(sav);
}
static void
key_delsav(sav)
struct secasvar *sav;
{
int s;
/* sanity check */
if (sav == NULL)
panic("key_delsav: NULL pointer is passed.");
if (sav->refcnt > 0)
panic("key_delsav: called with positive refcnt");
s = splnet();
if (__LIST_CHAINED(sav))
LIST_REMOVE(sav, chain);
if (sav->spihash.le_prev || sav->spihash.le_next)
LIST_REMOVE(sav, spihash);
if (sav->key_auth != NULL) {
bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth));
KFREE(sav->key_auth);
sav->key_auth = NULL;
}
if (sav->key_enc != NULL) {
bzero(_KEYBUF(sav->key_enc), _KEYLEN(sav->key_enc));
KFREE(sav->key_enc);
sav->key_enc = NULL;
}
if (sav->sched) {
bzero(sav->sched, sav->schedlen);
KFREE(sav->sched);
sav->sched = NULL;
}
if (sav->replay != NULL) {
keydb_delsecreplay(sav->replay);
sav->replay = NULL;
}
if (sav->lft_c != NULL) {
KFREE(sav->lft_c);
sav->lft_c = NULL;
}
if (sav->lft_h != NULL) {
KFREE(sav->lft_h);
sav->lft_h = NULL;
}
if (sav->lft_s != NULL) {
KFREE(sav->lft_s);
sav->lft_s = NULL;
}
if (sav->iv != NULL) {
KFREE(sav->iv);
sav->iv = NULL;
}
keydb_delsecasvar(sav);
splx(s);
}
/* %%% SPD management */
/*
* free security policy entry.
*/
static void
key_delsp(sp)
struct secpolicy *sp;
{
int s;
/* sanity check */
if (sp == NULL)
panic("key_delsp: NULL pointer is passed.");
if (sp->refcnt > 0)
panic("key_delsp: called with positive refcnt");
s = splnet(); /*called from softclock()*/
{
struct ipsecrequest *isr = sp->req, *nextisr;
while (isr != NULL) {
if (isr->sav != NULL) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP delsp calls free SA:%p\n",
isr->sav));
key_freesav(isr->sav);
isr->sav = NULL;
}
nextisr = isr->next;
KFREE(isr);
isr = nextisr;
}
}
keydb_delsecpolicy(sp);
splx(s);
return;
}
/*
* search SPD
* OUT: NULL : not found
* others : found, pointer to a SP.
*/
static struct secpolicy *
key_getsp(spidx, dir)
struct secpolicyindex *spidx;
int dir;
{
struct secpolicy *sp;
/* sanity check */
if (spidx == NULL)
panic("key_getsp: NULL pointer is passed.");
LIST_FOREACH(sp, &sptree[dir], chain) {
if (sp->state == IPSEC_SPSTATE_DEAD)
continue;
if (!sp->spidx)
continue;
if (key_cmpspidx_exactly(spidx, sp->spidx)) {
sp->refcnt++;
return sp;
}
}
return NULL;
}
/*
* get SP by index.
* OUT: NULL : not found
* others : found, pointer to a SP.
*/
static struct secpolicy *
key_getspbyid(id)
u_int32_t id;
{
struct secpolicy *sp;
TAILQ_FOREACH(sp, &sptailq, tailq) {
if (sp->id == id) {
sp->refcnt++;
return sp;
}
}
return NULL;
}
struct secpolicy *
key_newsp(id)
u_int32_t id;
{
struct secpolicy *newsp = NULL, *sp;
u_int32_t newid;
if (id > IPSEC_MANUAL_POLICYID_MAX) {
ipseclog((LOG_DEBUG,
"key_newsp: policy_id=%u range "
"violation, updated by kernel.\n", id));
id = 0;
}
if (id == 0) {
if ((newid = keydb_newspid()) == 0) {
ipseclog((LOG_DEBUG,
"key_newsp: new policy_id allocation failed."));
return NULL;
}
} else {
sp = key_getspbyid(id);
if (sp != NULL) {
ipseclog((LOG_DEBUG,
"key_newsp: policy_id(%u) has been used.\n", id));
key_freesp(sp);
return NULL;
}
newid = id;
}
newsp = keydb_newsecpolicy();
if (!newsp)
return newsp;
newsp->id = newid;
newsp->refcnt = 1;
newsp->req = NULL;
return newsp;
}
/*
* create secpolicy structure from sadb_x_policy structure.
* NOTE: `state', `secpolicyindex' in secpolicy structure are not set,
* so must be set properly later.
*/
struct secpolicy *
key_msg2sp(xpl0, len, error)
struct sadb_x_policy *xpl0;
size_t len;
int *error;
{
struct secpolicy *newsp;
/* sanity check */
if (xpl0 == NULL)
panic("key_msg2sp: NULL pointer was passed.");
if (len < sizeof(*xpl0))
panic("key_msg2sp: invalid length.");
if (len != PFKEY_EXTLEN(xpl0)) {
ipseclog((LOG_DEBUG, "key_msg2sp: Invalid msg length.\n"));
*error = EINVAL;
return NULL;
}
if ((newsp = key_newsp(xpl0->sadb_x_policy_id)) == NULL) {
*error = ENOBUFS;
return NULL;
}
newsp->dir = xpl0->sadb_x_policy_dir;
newsp->policy = xpl0->sadb_x_policy_type;
/* check policy */
switch (xpl0->sadb_x_policy_type) {
case IPSEC_POLICY_DISCARD:
case IPSEC_POLICY_NONE:
case IPSEC_POLICY_ENTRUST:
case IPSEC_POLICY_BYPASS:
newsp->req = NULL;
break;
case IPSEC_POLICY_IPSEC:
{
int tlen;
struct sadb_x_ipsecrequest *xisr;
struct ipsecrequest **p_isr = &newsp->req;
/* validity check */
if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) {
ipseclog((LOG_DEBUG,
"key_msg2sp: Invalid msg length.\n"));
key_freesp(newsp);
*error = EINVAL;
return NULL;
}
tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0);
xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1);
while (tlen > 0) {
/* length check */
if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) {
ipseclog((LOG_DEBUG, "key_msg2sp: "
"invalid ipsecrequest length.\n"));
key_freesp(newsp);
*error = EINVAL;
return NULL;
}
/* allocate request buffer */
KMALLOC(*p_isr, struct ipsecrequest *, sizeof(**p_isr));
if ((*p_isr) == NULL) {
ipseclog((LOG_DEBUG,
"key_msg2sp: No more memory.\n"));
key_freesp(newsp);
*error = ENOBUFS;
return NULL;
}
bzero(*p_isr, sizeof(**p_isr));
/* set values */
(*p_isr)->next = NULL;
switch (xisr->sadb_x_ipsecrequest_proto) {
case IPPROTO_ESP:
case IPPROTO_AH:
case IPPROTO_IPCOMP:
break;
default:
ipseclog((LOG_DEBUG,
"key_msg2sp: invalid proto type=%u\n",
xisr->sadb_x_ipsecrequest_proto));
key_freesp(newsp);
*error = EPROTONOSUPPORT;
return NULL;
}
(*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto;
switch (xisr->sadb_x_ipsecrequest_mode) {
case IPSEC_MODE_TRANSPORT:
case IPSEC_MODE_TUNNEL:
break;
case IPSEC_MODE_ANY:
default:
ipseclog((LOG_DEBUG,
"key_msg2sp: invalid mode=%u\n",
xisr->sadb_x_ipsecrequest_mode));
key_freesp(newsp);
*error = EINVAL;
return NULL;
}
(*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode;
switch (xisr->sadb_x_ipsecrequest_level) {
case IPSEC_LEVEL_DEFAULT:
case IPSEC_LEVEL_USE:
case IPSEC_LEVEL_REQUIRE:
break;
case IPSEC_LEVEL_UNIQUE:
/* validity check */
/*
* If range violation of reqid, kernel will
* update it, don't refuse it.
*/
if (xisr->sadb_x_ipsecrequest_reqid
> IPSEC_MANUAL_REQID_MAX) {
ipseclog((LOG_DEBUG,
"key_msg2sp: reqid=%u range "
"violation, updated by kernel.\n",
xisr->sadb_x_ipsecrequest_reqid));
xisr->sadb_x_ipsecrequest_reqid = 0;
}
/* allocate new reqid id if reqid is zero. */
if (xisr->sadb_x_ipsecrequest_reqid == 0) {
u_int32_t reqid;
if ((reqid = key_newreqid()) == 0) {
key_freesp(newsp);
*error = ENOBUFS;
return NULL;
}
(*p_isr)->saidx.reqid = reqid;
xisr->sadb_x_ipsecrequest_reqid = reqid;
} else {
/* set it for manual keying. */
(*p_isr)->saidx.reqid =
xisr->sadb_x_ipsecrequest_reqid;
}
break;
default:
ipseclog((LOG_DEBUG, "key_msg2sp: invalid level=%u\n",
xisr->sadb_x_ipsecrequest_level));
key_freesp(newsp);
*error = EINVAL;
return NULL;
}
(*p_isr)->level = xisr->sadb_x_ipsecrequest_level;
/* set IP addresses if there */
if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
struct sockaddr *paddr;
paddr = (struct sockaddr *)(xisr + 1);
/* validity check */
if (paddr->sa_len
> sizeof((*p_isr)->saidx.src)) {
ipseclog((LOG_DEBUG, "key_msg2sp: invalid request "
"address length.\n"));
key_freesp(newsp);
*error = EINVAL;
return NULL;
}
bcopy(paddr, &(*p_isr)->saidx.src,
paddr->sa_len);
paddr = (struct sockaddr *)((caddr_t)paddr
+ paddr->sa_len);
/* validity check */
if (paddr->sa_len
> sizeof((*p_isr)->saidx.dst)) {
ipseclog((LOG_DEBUG, "key_msg2sp: invalid request "
"address length.\n"));
key_freesp(newsp);
*error = EINVAL;
return NULL;
}
bcopy(paddr, &(*p_isr)->saidx.dst,
paddr->sa_len);
}
(*p_isr)->sav = NULL;
(*p_isr)->sp = newsp;
/* initialization for the next. */
p_isr = &(*p_isr)->next;
tlen -= xisr->sadb_x_ipsecrequest_len;
/* validity check */
if (tlen < 0) {
ipseclog((LOG_DEBUG, "key_msg2sp: becoming tlen < 0.\n"));
key_freesp(newsp);
*error = EINVAL;
return NULL;
}
xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr
+ xisr->sadb_x_ipsecrequest_len);
}
}
break;
default:
ipseclog((LOG_DEBUG, "key_msg2sp: invalid policy type.\n"));
key_freesp(newsp);
*error = EINVAL;
return NULL;
}
*error = 0;
return newsp;
}
static u_int32_t
key_newreqid()
{
static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
auto_reqid = (auto_reqid == ~0
? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1);
/* XXX should be unique check */
return auto_reqid;
}
/*
* copy secpolicy struct to sadb_x_policy structure indicated.
*/
struct mbuf *
key_sp2msg(sp)
struct secpolicy *sp;
{
struct sadb_x_policy *xpl;
int tlen;
caddr_t p;
struct mbuf *m;
/* sanity check. */
if (sp == NULL)
panic("key_sp2msg: NULL pointer was passed.");
tlen = key_getspreqmsglen(sp);
m = key_alloc_mbuf(tlen);
if (!m || m->m_next) { /*XXX*/
if (m)
m_freem(m);
return NULL;
}
m->m_len = tlen;
m->m_next = NULL;
xpl = mtod(m, struct sadb_x_policy *);
bzero(xpl, tlen);
xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen);
xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
xpl->sadb_x_policy_type = sp->policy;
xpl->sadb_x_policy_dir = sp->dir;
xpl->sadb_x_policy_id = sp->id;
p = (caddr_t)xpl + sizeof(*xpl);
/* if is the policy for ipsec ? */
if (sp->policy == IPSEC_POLICY_IPSEC) {
struct sadb_x_ipsecrequest *xisr;
struct ipsecrequest *isr;
for (isr = sp->req; isr != NULL; isr = isr->next) {
xisr = (struct sadb_x_ipsecrequest *)p;
xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto;
xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode;
xisr->sadb_x_ipsecrequest_level = isr->level;
xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid;
p += sizeof(*xisr);
bcopy(&isr->saidx.src, p, isr->saidx.src.ss_len);
p += isr->saidx.src.ss_len;
bcopy(&isr->saidx.dst, p, isr->saidx.dst.ss_len);
p += isr->saidx.src.ss_len;
xisr->sadb_x_ipsecrequest_len =
PFKEY_ALIGN8(sizeof(*xisr) +
isr->saidx.src.ss_len + isr->saidx.dst.ss_len);
}
}
return m;
}
/* m will not be freed nor modified */
static struct mbuf *
#ifdef __STDC__
key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp,
int ndeep, int nitem, ...)
#else
key_gather_mbuf(m, mhp, ndeep, nitem, va_alist)
struct mbuf *m;
const struct sadb_msghdr *mhp;
int ndeep;
int nitem;
va_dcl
#endif
{
va_list ap;
int idx;
int i;
struct mbuf *result = NULL, *n;
int len;
if (m == NULL || mhp == NULL)
panic("null pointer passed to key_gather");
va_start(ap, nitem);
for (i = 0; i < nitem; i++) {
idx = va_arg(ap, int);
if (idx < 0 || idx > SADB_EXT_MAX)
goto fail;
/* don't attempt to pull empty extension */
if (idx == SADB_EXT_RESERVED && mhp->msg == NULL)
continue;
if (idx != SADB_EXT_RESERVED &&
(mhp->ext[idx] == NULL || mhp->extlen[idx] == 0))
continue;
if (idx == SADB_EXT_RESERVED) {
len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
#ifdef DIAGNOSTIC
if (len > MHLEN)
panic("assumption failed");
#endif
MGETHDR(n, M_DONTWAIT, MT_DATA);
if (!n)
goto fail;
n->m_len = len;
n->m_next = NULL;
m_copydata(m, 0, sizeof(struct sadb_msg),
mtod(n, caddr_t));
} else if (i < ndeep) {
len = mhp->extlen[idx];
n = key_alloc_mbuf(len);
if (!n || n->m_next) { /*XXX*/
if (n)
m_freem(n);
goto fail;
}
m_copydata(m, mhp->extoff[idx], mhp->extlen[idx],
mtod(n, caddr_t));
} else {
n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx],
M_DONTWAIT);
}
if (n == NULL)
goto fail;
if (result)
m_cat(result, n);
else
result = n;
}
va_end(ap);
if ((result->m_flags & M_PKTHDR) != 0) {
result->m_pkthdr.len = 0;
for (n = result; n; n = n->m_next)
result->m_pkthdr.len += n->m_len;
}
return result;
fail:
va_end(ap);
m_freem(result);
return NULL;
}
/*
* SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing
* add an entry to SP database, when received
* <base, address(SD), (lifetime(H),) policy>
* from the user(?).
* Adding to SP database,
* and send
* <base, address(SD), (lifetime(H),) policy>
* to the socket which was send.
*
* SPDADD set a unique policy entry.
* SPDSETIDX like SPDADD without a part of policy requests.
* SPDUPDATE replace a unique policy entry.
*
* m will always be freed.
*/
static int
key_spdadd(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct sadb_address *src0 = NULL, *dst0 = NULL;
struct sadb_x_policy *xpl0, *xpl;
struct sadb_lifetime *lft = NULL;
struct secpolicyindex spidx;
struct secpolicy *newsp;
struct ipsecrequest *isr;
int error;
int spidxmode;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_spdadd: NULL pointer is passed.");
if (mhp->ext[SADB_EXT_ADDRESS_SRC] != NULL &&
mhp->ext[SADB_EXT_ADDRESS_DST] != NULL) {
;
} else {
ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->ext[SADB_X_EXT_POLICY] == NULL) {
ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if ((mhp->extlen[SADB_EXT_ADDRESS_SRC] &&
mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address)) ||
(mhp->extlen[SADB_EXT_ADDRESS_DST] &&
mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) ||
mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) {
if (mhp->extlen[SADB_EXT_LIFETIME_HARD]
< sizeof(struct sadb_lifetime)) {
ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
}
/* spidx mode, or tag mode */
spidxmode = (mhp->ext[SADB_EXT_ADDRESS_SRC] != NULL);
if (spidxmode) {
src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
/* make secindex */
/* XXX boundary check against sa_len */
KEY_SETSECSPIDX(src0 + 1, dst0 + 1,
src0->sadb_address_prefixlen, dst0->sadb_address_prefixlen,
src0->sadb_address_proto, &spidx);
}
xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
/* checking the direciton. */
switch (xpl0->sadb_x_policy_dir) {
case IPSEC_DIR_INBOUND:
case IPSEC_DIR_OUTBOUND:
break;
default:
ipseclog((LOG_DEBUG, "key_spdadd: Invalid SP direction.\n"));
mhp->msg->sadb_msg_errno = EINVAL;
return 0;
}
/* check policy */
/* key_spdadd() accepts DISCARD, NONE and IPSEC. */
if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST ||
xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) {
ipseclog((LOG_DEBUG, "key_spdadd: Invalid policy type.\n"));
return key_senderror(so, m, EINVAL);
}
/* policy requests are mandatory when action is ipsec. */
if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX &&
xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) {
ipseclog((LOG_DEBUG, "key_spdadd: some policy requests part required.\n"));
return key_senderror(so, m, EINVAL);
}
/*
* checking there is SP already or not.
* SPDUPDATE doesn't depend on whether there is a SP or not.
* If the type is either SPDADD or SPDSETIDX AND a SP is found,
* then error.
*/
if (xpl0->sadb_x_policy_id != 0)
newsp = key_getspbyid(xpl0->sadb_x_policy_id);
else if (spidxmode)
newsp = key_getsp(&spidx, xpl0->sadb_x_policy_dir);
else
newsp = NULL;
if (newsp && (newsp->readonly || newsp->persist)) {
ipseclog((LOG_DEBUG,
"key_spdadd: tried to alter readonly/persistent SP.\n"));
return key_senderror(so, m, EPERM);
}
if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
if (newsp) {
key_sp_dead(newsp);
key_freesp(newsp); /* ref gained by key_getsp */
key_sp_unlink(newsp);
newsp = NULL;
}
} else {
if (newsp != NULL) {
key_freesp(newsp);
ipseclog((LOG_DEBUG, "key_spdadd: a SP entry exists already.\n"));
return key_senderror(so, m, EEXIST);
}
}
/* allocation new SP entry */
if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) {
return key_senderror(so, m, error);
}
if (spidxmode) {
error = keydb_setsecpolicyindex(newsp, &spidx);
if (error) {
keydb_delsecpolicy(newsp);
return key_senderror(so, m, error);
}
/* sanity check on addr pair */
if (((struct sockaddr *)(src0 + 1))->sa_family !=
((struct sockaddr *)(dst0 + 1))->sa_family) {
keydb_delsecpolicy(newsp);
return key_senderror(so, m, EINVAL);
}
if (((struct sockaddr *)(src0 + 1))->sa_len !=
((struct sockaddr *)(dst0 + 1))->sa_len) {
keydb_delsecpolicy(newsp);
return key_senderror(so, m, EINVAL);
}
}
for (isr = newsp->req; isr; isr = isr->next) {
struct sockaddr *sa;
/*
* port spec is not permitted for tunnel mode
*/
if (isr->saidx.mode == IPSEC_MODE_TUNNEL && src0 && dst0) {
sa = (struct sockaddr *)(src0 + 1);
switch (sa->sa_family) {
case AF_INET:
if (((struct sockaddr_in *)sa)->sin_port) {
keydb_delsecpolicy(newsp);
return key_senderror(so, m, EINVAL);
}
break;
case AF_INET6:
if (((struct sockaddr_in6 *)sa)->sin6_port) {
keydb_delsecpolicy(newsp);
return key_senderror(so, m, EINVAL);
}
break;
default:
break;
}
sa = (struct sockaddr *)(dst0 + 1);
switch (sa->sa_family) {
case AF_INET:
if (((struct sockaddr_in *)sa)->sin_port) {
keydb_delsecpolicy(newsp);
return key_senderror(so, m, EINVAL);
}
break;
case AF_INET6:
if (((struct sockaddr_in6 *)sa)->sin6_port) {
keydb_delsecpolicy(newsp);
return key_senderror(so, m, EINVAL);
}
break;
default:
break;
}
}
}
/*
* bark if we have different address family on tunnel address
* specification. applies only if we decapsulate in RFC2401
* IPsec (implementation limitation).
*/
for (isr = newsp->req; isr; isr = isr->next) {
struct sockaddr *sa;
if (isr->saidx.src.ss_family && src0) {
sa = (struct sockaddr *)(src0 + 1);
if (sa->sa_family != isr->saidx.src.ss_family) {
keydb_delsecpolicy(newsp);
return key_senderror(so, m, EINVAL);
}
}
if (isr->saidx.dst.ss_family && dst0) {
sa = (struct sockaddr *)(dst0 + 1);
if (sa->sa_family != isr->saidx.dst.ss_family) {
keydb_delsecpolicy(newsp);
return key_senderror(so, m, EINVAL);
}
}
}
newsp->created = time_second;
newsp->lastused = time_second;
newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0;
newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0;
newsp->state = IPSEC_SPSTATE_ALIVE;
LIST_INSERT_TAIL(&sptree[newsp->dir], newsp, secpolicy, chain);
/* delete the entry in spacqtree */
if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE &&
mhp->ext[SADB_EXT_ADDRESS_SRC]) {
struct secspacq *spacq;
if ((spacq = key_getspacq(&spidx)) != NULL) {
/* reset counter in order to deletion by timehandler. */
spacq->created = time_second;
spacq->count = 0;
}
}
/* invalidate all cached SPD pointers on pcb */
ipsec_invalpcbcacheall();
{
struct mbuf *n, *mpolicy;
struct sadb_msg *newmsg;
int off;
/* create new sadb_msg to reply. */
if (lft) {
n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED,
SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD,
SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
} else {
n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED,
SADB_X_EXT_POLICY,
SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
}
if (!n)
return key_senderror(so, m, ENOBUFS);
if (n->m_len < sizeof(*newmsg)) {
n = m_pullup(n, sizeof(*newmsg));
if (!n)
return key_senderror(so, m, ENOBUFS);
}
newmsg = mtod(n, struct sadb_msg *);
newmsg->sadb_msg_errno = 0;
newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
off = 0;
mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)),
sizeof(*xpl), &off);
if (mpolicy == NULL) {
/* n is already freed */
return key_senderror(so, m, ENOBUFS);
}
xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off);
if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
m_freem(n);
return key_senderror(so, m, EINVAL);
}
xpl->sadb_x_policy_id = newsp->id;
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
}
}
/*
* SADB_SPDDELETE processing
* receive
* <base, address(SD), policy(*)>
* from the user(?), and set SADB_SASTATE_DEAD,
* and send,
* <base, address(SD), policy(*)>
* to the ikmpd.
* policy(*) including the direction of the policy.
*
* m will always be freed.
*/
static int
key_spddelete(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct sadb_address *src0, *dst0;
struct sadb_x_policy *xpl0;
struct secpolicyindex spidx;
struct secpolicy *sp;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_spddelete: NULL pointer is passed.");
if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
mhp->ext[SADB_X_EXT_POLICY] == NULL) {
ipseclog((LOG_DEBUG, "key_spddelete: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
ipseclog((LOG_DEBUG, "key_spddelete: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
/* make secindex */
/* XXX boundary check against sa_len */
KEY_SETSECSPIDX(src0 + 1,
dst0 + 1,
src0->sadb_address_prefixlen,
dst0->sadb_address_prefixlen,
src0->sadb_address_proto,
&spidx);
/* checking the direciton. */
switch (xpl0->sadb_x_policy_dir) {
case IPSEC_DIR_INBOUND:
case IPSEC_DIR_OUTBOUND:
break;
default:
ipseclog((LOG_DEBUG, "key_spddelete: Invalid SP direction.\n"));
return key_senderror(so, m, EINVAL);
}
/* Is there SP in SPD ? */
if ((sp = key_getsp(&spidx, xpl0->sadb_x_policy_dir)) == NULL) {
ipseclog((LOG_DEBUG, "key_spddelete: no SP found.\n"));
return key_senderror(so, m, EINVAL);
}
if (sp->persist) {
ipseclog((LOG_DEBUG,
"key_spddelete2: attempt to remove persistent SP:%u.\n",
sp->id));
key_freesp(sp); /* ref gained by key_getsp */
return key_senderror(so, m, EPERM);
}
/* save policy id to be returned. */
xpl0->sadb_x_policy_id = sp->id;
key_sp_dead(sp);
key_freesp(sp); /* ref gained by key_getsp */
key_sp_unlink(sp);
sp = NULL;
/* invalidate all cached SPD pointers on pcb */
ipsec_invalpcbcacheall();
{
struct mbuf *n;
struct sadb_msg *newmsg;
/* create new sadb_msg to reply. */
n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
if (!n)
return key_senderror(so, m, ENOBUFS);
newmsg = mtod(n, struct sadb_msg *);
newmsg->sadb_msg_errno = 0;
newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
}
}
/*
* SADB_SPDDELETE2 processing
* receive
* <base, policy(*)>
* from the user(?), and set SADB_SASTATE_DEAD,
* and send,
* <base, policy(*)>
* to the ikmpd.
* policy(*) including the policy id.
*
* m will always be freed.
*/
static int
key_spddelete2(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
u_int32_t id;
struct secpolicy *sp;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_spddelete2: NULL pointer is passed.");
if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
ipseclog((LOG_DEBUG, "key_spddelete2: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
/* Is there SP in SPD ? */
if ((sp = key_getspbyid(id)) == NULL) {
ipseclog((LOG_DEBUG, "key_spddelete2: no SP found id:%u.\n",
id));
return key_senderror(so, m, EINVAL);
}
if (sp->persist) {
ipseclog((LOG_DEBUG,
"key_spddelete2: attempt to remove persistent SP:%u.\n",
id));
key_freesp(sp); /* ref gained by key_getspbyid */
return key_senderror(so, m, EPERM);
}
key_sp_dead(sp);
key_freesp(sp); /* ref gained by key_getspbyid */
key_sp_unlink(sp);
sp = NULL;
/* invalidate all cached SPD pointers on pcb */
ipsec_invalpcbcacheall();
{
struct mbuf *n, *nn;
struct sadb_msg *newmsg;
int off, len;
/* create new sadb_msg to reply. */
len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
if (len > MCLBYTES)
return key_senderror(so, m, ENOBUFS);
MGETHDR(n, M_DONTWAIT, MT_DATA);
if (n && len > MHLEN) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_freem(n);
n = NULL;
}
}
if (!n)
return key_senderror(so, m, ENOBUFS);
n->m_len = len;
n->m_next = NULL;
off = 0;
m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
#ifdef DIAGNOSTIC
if (off != len)
panic("length inconsistency in key_spddelete2");
#endif
n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY],
mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT);
if (!n->m_next) {
m_freem(n);
return key_senderror(so, m, ENOBUFS);
}
n->m_pkthdr.len = 0;
for (nn = n; nn; nn = nn->m_next)
n->m_pkthdr.len += nn->m_len;
newmsg = mtod(n, struct sadb_msg *);
newmsg->sadb_msg_errno = 0;
newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
}
}
/*
* SADB_X_SPDGET processing
* receive
* <base, policy(*)>
* from the user(?),
* and send,
* <base, address(SD), policy>
* to the ikmpd.
* policy(*) including direction of policy.
*
* m will always be freed.
*/
static int
key_spdget(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
u_int32_t id;
struct secpolicy *sp;
struct mbuf *n;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_spdget: NULL pointer is passed.");
if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
ipseclog((LOG_DEBUG, "key_spdget: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
/* Is there SP in SPD ? */
if ((sp = key_getspbyid(id)) == NULL) {
ipseclog((LOG_DEBUG, "key_spdget: no SP found id:%u.\n", id));
return key_senderror(so, m, ENOENT);
}
n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid);
key_freesp(sp); /* ref gained by key_getspbyid */
if (n != NULL) {
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
} else
return key_senderror(so, m, ENOBUFS);
}
/*
* SADB_X_SPDACQUIRE processing.
* Acquire policy and SA(s) for a *OUTBOUND* packet.
* send
* <base, policy(*)>
* to KMD, and expect to receive
* <base> with SADB_X_SPDACQUIRE if error occured,
* or
* <base, policy>
* with SADB_X_SPDUPDATE from KMD by PF_KEY.
* policy(*) is without policy requests.
*
* 0 : succeed
* others: error number
*/
int
key_spdacquire(sp)
struct secpolicy *sp;
{
struct mbuf *result = NULL, *m;
#ifndef IPSEC_NONBLOCK_ACQUIRE
struct secspacq *newspacq;
#endif
int error = -1;
/* sanity check */
if (sp == NULL)
panic("key_spdacquire: NULL pointer is passed.");
if (sp->req != NULL)
panic("key_spdacquire: called but there is request.");
if (sp->policy != IPSEC_POLICY_IPSEC)
panic("key_spdacquire: policy mismathed. IPsec is expected.");
if (!sp->spidx) {
error = EOPNOTSUPP;
goto fail;
}
#ifndef IPSEC_NONBLOCK_ACQUIRE
/* get an entry to check whether sent message or not. */
if ((newspacq = key_getspacq(sp->spidx)) != NULL) {
if (key_blockacq_count < newspacq->count) {
/* reset counter and do send message. */
newspacq->count = 0;
} else {
/* increment counter and do nothing. */
newspacq->count++;
return 0;
}
} else {
/* make new entry for blocking to send SADB_ACQUIRE. */
if ((newspacq = key_newspacq(sp->spidx)) == NULL)
return ENOBUFS;
/* add to acqtree */
LIST_INSERT_HEAD(&spacqtree, newspacq, chain);
}
#endif
/* create new sadb_msg to reply. */
m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0);
if (!m) {
error = ENOBUFS;
goto fail;
}
result = m;
/* set sadb_x_policy */
if (sp) {
m = key_setsadbxpolicy(sp->policy, sp->dir, sp->id);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
}
result->m_pkthdr.len = 0;
for (m = result; m; m = m->m_next)
result->m_pkthdr.len += m->m_len;
mtod(result, struct sadb_msg *)->sadb_msg_len =
PFKEY_UNIT64(result->m_pkthdr.len);
return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
fail:
if (result)
m_freem(result);
return error;
}
/*
* SADB_SPDFLUSH processing
* receive
* <base>
* from the user, and free all entries in secpctree.
* and send,
* <base>
* to the user.
* NOTE: what to do is only marking SADB_SASTATE_DEAD.
*
* m will always be freed.
*/
static int
key_spdflush(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct sadb_msg *newmsg;
struct secpolicy *sp, *nextsp;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_spdflush: NULL pointer is passed.");
if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg)))
return key_senderror(so, m, EINVAL);
for (sp = TAILQ_FIRST(&sptailq); sp; sp = nextsp) {
nextsp = TAILQ_NEXT(sp, tailq);
if (sp->persist)
continue;
if (sp->state == IPSEC_SPSTATE_DEAD)
continue;
key_sp_dead(sp);
key_sp_unlink(sp);
sp = NULL;
}
/* invalidate all cached SPD pointers on pcb */
ipsec_invalpcbcacheall();
if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
ipseclog((LOG_DEBUG, "key_spdflush: No more memory.\n"));
return key_senderror(so, m, ENOBUFS);
}
if (m->m_next)
m_freem(m->m_next);
m->m_next = NULL;
m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
newmsg = mtod(m, struct sadb_msg *);
newmsg->sadb_msg_errno = 0;
newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
}
/*
* SADB_SPDDUMP processing
* receive
* <base>
* from the user, and dump all SP leaves
* and send,
* <base> .....
* to the ikmpd.
*
* m will always be freed.
*/
static int
key_spddump(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct secpolicy *sp;
int cnt;
u_int dir;
struct mbuf *n;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_spddump: NULL pointer is passed.");
/* search SPD entry and get buffer size. */
cnt = 0;
for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
LIST_FOREACH(sp, &sptree[dir], chain) {
cnt++;
}
}
if (cnt == 0)
return key_senderror(so, m, ENOENT);
for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
LIST_FOREACH(sp, &sptree[dir], chain) {
--cnt;
n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
mhp->msg->sadb_msg_pid);
if (n)
key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
}
}
m_freem(m);
return 0;
}
static struct mbuf *
key_setdumpsp(sp, type, seq, pid)
struct secpolicy *sp;
u_int8_t type;
u_int32_t seq, pid;
{
struct mbuf *result = NULL, *m;
m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt);
if (!m)
goto fail;
result = m;
if (sp->spidx) {
m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
(struct sockaddr *)&sp->spidx->src, sp->spidx->prefs,
sp->spidx->ul_proto);
if (!m)
goto fail;
m_cat(result, m);
m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
(struct sockaddr *)&sp->spidx->dst, sp->spidx->prefd,
sp->spidx->ul_proto);
if (!m)
goto fail;
m_cat(result, m);
}
m = key_sp2msg(sp);
if (!m)
goto fail;
m_cat(result, m);
m = key_setsadblifetime(SADB_EXT_LIFETIME_CURRENT,
0, 0, (u_int64_t)sp->created, (u_int64_t)sp->lastused);
if (!m)
goto fail;
m_cat(result, m);
m = key_setsadblifetime(SADB_EXT_LIFETIME_HARD,
0, 0, (u_int64_t)sp->lifetime, (u_int64_t)sp->validtime);
if (!m)
goto fail;
m_cat(result, m);
if ((result->m_flags & M_PKTHDR) == 0)
goto fail;
if (result->m_len < sizeof(struct sadb_msg)) {
result = m_pullup(result, sizeof(struct sadb_msg));
if (result == NULL)
goto fail;
}
result->m_pkthdr.len = 0;
for (m = result; m; m = m->m_next)
result->m_pkthdr.len += m->m_len;
mtod(result, struct sadb_msg *)->sadb_msg_len =
PFKEY_UNIT64(result->m_pkthdr.len);
return result;
fail:
m_freem(result);
return NULL;
}
/*
* get PFKEY message length for security policy and request.
*/
static u_int
key_getspreqmsglen(sp)
struct secpolicy *sp;
{
u_int tlen;
tlen = sizeof(struct sadb_x_policy);
/* if is the policy for ipsec ? */
if (sp->policy != IPSEC_POLICY_IPSEC)
return tlen;
/* get length of ipsec requests */
{
struct ipsecrequest *isr;
int len;
for (isr = sp->req; isr != NULL; isr = isr->next) {
len = sizeof(struct sadb_x_ipsecrequest)
+ isr->saidx.src.ss_len
+ isr->saidx.dst.ss_len;
tlen += PFKEY_ALIGN8(len);
}
}
return tlen;
}
/*
* SADB_X_SPDEXPIRE processing
* send
* <base, address(SD), lifetime(CH), policy>
* to KMD by PF_KEY.
*
* OUT: 0 : succeed
* others : error number
*/
static int
key_spdexpire(sp)
struct secpolicy *sp;
{
int s;
struct mbuf *result = NULL, *m;
int len;
int error = -1;
struct sadb_lifetime *lt;
/* XXX: Why do we lock ? */
s = splnet(); /*called from softclock()*/
/* sanity check */
if (sp == NULL)
panic("key_spdexpire: NULL pointer is passed.");
/* set msg header */
m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0);
if (!m) {
error = ENOBUFS;
goto fail;
}
result = m;
/* create lifetime extension (current and hard) */
len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
m = key_alloc_mbuf(len);
if (!m || m->m_next) { /*XXX*/
if (m)
m_freem(m);
error = ENOBUFS;
goto fail;
}
bzero(mtod(m, caddr_t), len);
lt = mtod(m, struct sadb_lifetime *);
lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
lt->sadb_lifetime_allocations = 0;
lt->sadb_lifetime_bytes = 0;
lt->sadb_lifetime_addtime = sp->created;
lt->sadb_lifetime_usetime = sp->lastused;
lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
lt->sadb_lifetime_allocations = 0;
lt->sadb_lifetime_bytes = 0;
lt->sadb_lifetime_addtime = sp->lifetime;
lt->sadb_lifetime_usetime = sp->validtime;
m_cat(result, m);
/* set sadb_address for source */
if (sp->spidx) {
m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
(struct sockaddr *)&sp->spidx->src,
sp->spidx->prefs, sp->spidx->ul_proto);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
/* set sadb_address for destination */
m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
(struct sockaddr *)&sp->spidx->dst,
sp->spidx->prefd, sp->spidx->ul_proto);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
}
/* set secpolicy */
m = key_sp2msg(sp);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
if ((result->m_flags & M_PKTHDR) == 0) {
error = EINVAL;
goto fail;
}
if (result->m_len < sizeof(struct sadb_msg)) {
result = m_pullup(result, sizeof(struct sadb_msg));
if (result == NULL) {
error = ENOBUFS;
goto fail;
}
}
result->m_pkthdr.len = 0;
for (m = result; m; m = m->m_next)
result->m_pkthdr.len += m->m_len;
mtod(result, struct sadb_msg *)->sadb_msg_len =
PFKEY_UNIT64(result->m_pkthdr.len);
splx(s);
return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
fail:
if (result)
m_freem(result);
splx(s);
return error;
}
/* %%% SAD management */
/*
* allocating a memory for new SA head, and copy from the values of mhp.
* OUT: NULL : failure due to the lack of memory.
* others : pointer to new SA head.
*/
static struct secashead *
key_newsah(saidx)
struct secasindex *saidx;
{
struct secashead *newsah;
/* sanity check */
if (saidx == NULL)
panic("key_newsaidx: NULL pointer is passed.");
newsah = keydb_newsecashead();
if (newsah == NULL)
return NULL;
bcopy(saidx, &newsah->saidx, sizeof(newsah->saidx));
/* add to saidxtree */
newsah->state = SADB_SASTATE_MATURE;
LIST_INSERT_HEAD(&sahtree, newsah, chain);
return (newsah);
}
/*
* delete SA index and all SA registerd.
*/
static void
key_delsah(sah)
struct secashead *sah;
{
struct secasvar *sav, *nextsav;
u_int stateidx, state;
int s;
int zombie = 0;
/* sanity check */
if (sah == NULL)
panic("key_delsah: NULL pointer is passed.");
s = splnet(); /*called from softclock()*/
/* searching all SA registerd in the secindex. */
for (stateidx = 0;
stateidx < _ARRAYLEN(saorder_state_any);
stateidx++) {
state = saorder_state_any[stateidx];
for (sav = LIST_FIRST(&sah->savtree[state]);
sav != NULL;
sav = nextsav) {
nextsav = LIST_NEXT(sav, chain);
if (sav->refcnt > 0) {
/* give up to delete this sa */
zombie++;
continue;
}
/* sanity check */
KEY_CHKSASTATE(state, sav->state, "key_delsah");
/* remove back pointer */
sav->sah = NULL;
key_freesav(sav);
sav = NULL;
}
}
/* delete sah only if there's no sav. */
if (zombie) {
splx(s);
return;
}
if (sah->sa_route.ro_rt) {
RTFREE(sah->sa_route.ro_rt);
sah->sa_route.ro_rt = (struct rtentry *)NULL;
}
/* remove from tree of SA index */
if (__LIST_CHAINED(sah))
LIST_REMOVE(sah, chain);
KFREE(sah);
splx(s);
return;
}
/*
* allocating a new SA with LARVAL state. key_add() and key_getspi() call,
* and copy the values of mhp into new buffer.
* When SAD message type is GETSPI:
* to set sequence number from acq_seq++,
* to set zero to SPI.
* not to call key_setsava().
* OUT: NULL : fail
* others : pointer to new secasvar.
*
* does not modify mbuf. does not free mbuf on error.
*/
static struct secasvar *
key_newsav(m, mhp, sah, errp)
struct mbuf *m;
const struct sadb_msghdr *mhp;
struct secashead *sah;
int *errp;
{
struct secasvar *newsav;
const struct sadb_sa *xsa;
/* sanity check */
if (m == NULL || mhp == NULL || mhp->msg == NULL || sah == NULL)
panic("key_newsa: NULL pointer is passed.");
newsav = keydb_newsecasvar();
if (newsav == NULL) {
ipseclog((LOG_DEBUG, "key_newsa: No more memory.\n"));
*errp = ENOBUFS;
return NULL;
}
switch (mhp->msg->sadb_msg_type) {
case SADB_GETSPI:
key_setspi(newsav, 0);
#ifdef IPSEC_DOSEQCHECK
/* sync sequence number */
if (mhp->msg->sadb_msg_seq == 0)
newsav->seq =
(acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq));
else
#endif
newsav->seq = mhp->msg->sadb_msg_seq;
break;
case SADB_ADD:
/* sanity check */
if (mhp->ext[SADB_EXT_SA] == NULL) {
KFREE(newsav);
ipseclog((LOG_DEBUG, "key_newsa: invalid message is passed.\n"));
*errp = EINVAL;
return NULL;
}
xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
key_setspi(newsav, xsa->sadb_sa_spi);
newsav->seq = mhp->msg->sadb_msg_seq;
break;
default:
KFREE(newsav);
*errp = EINVAL;
return NULL;
}
/* copy sav values */
if (mhp->msg->sadb_msg_type != SADB_GETSPI) {
*errp = key_setsaval(newsav, m, mhp);
if (*errp) {
KFREE(newsav);
return NULL;
}
}
/* reset created */
newsav->created = time_second;
newsav->pid = mhp->msg->sadb_msg_pid;
/* add to satree */
newsav->sah = sah;
newsav->refcnt = 1;
newsav->state = SADB_SASTATE_LARVAL;
LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav,
secasvar, chain);
return newsav;
}
/*
* search SAD.
* OUT:
* NULL : not found
* others : found, pointer to a SA.
*/
static struct secashead *
key_getsah(saidx)
struct secasindex *saidx;
{
struct secashead *sah;
LIST_FOREACH(sah, &sahtree, chain) {
if (sah->state == SADB_SASTATE_DEAD)
continue;
if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID))
return sah;
}
return NULL;
}
/*
* check not to be duplicated SPI.
* NOTE: this function is too slow due to searching all SAD.
* OUT:
* NULL : not found
* others : found, pointer to a SA.
*/
static struct secasvar *
key_checkspidup(saidx, spi)
struct secasindex *saidx;
u_int32_t spi;
{
struct secasvar *sav;
u_int stateidx, state;
/* check address family */
if (saidx->src.ss_family != saidx->dst.ss_family) {
ipseclog((LOG_DEBUG, "key_checkspidup: address family mismatched.\n"));
return NULL;
}
/* check all SAD */
LIST_FOREACH(sav, &spihash[SPIHASH(spi)], spihash) {
if (sav->spi != spi)
continue;
for (stateidx = 0;
stateidx < _ARRAYLEN(saorder_state_alive);
stateidx++) {
state = saorder_state_alive[stateidx];
if (sav->state == state &&
key_ismyaddr((struct sockaddr *)&sav->sah->saidx.dst))
return sav;
}
}
return NULL;
}
static void
key_setspi(sav, spi)
struct secasvar *sav;
u_int32_t spi;
{
int s;
s = splnet();
sav->spi = spi;
if (sav->spihash.le_prev || sav->spihash.le_next)
LIST_REMOVE(sav, spihash);
LIST_INSERT_HEAD(&spihash[SPIHASH(spi)], sav, spihash);
splx(s);
}
/*
* search SAD litmited alive SA, protocol, SPI.
* OUT:
* NULL : not found
* others : found, pointer to a SA.
*/
static struct secasvar *
key_getsavbyspi(sah, spi)
struct secashead *sah;
u_int32_t spi;
{
struct secasvar *sav, *match;
u_int stateidx, state, matchidx;
match = NULL;
matchidx = _ARRAYLEN(saorder_state_alive);
LIST_FOREACH(sav, &spihash[SPIHASH(spi)], spihash) {
if (sav->spi != spi)
continue;
if (sav->sah != sah)
continue;
for (stateidx = 0; stateidx < matchidx; stateidx++) {
state = saorder_state_alive[stateidx];
if (sav->state == state) {
match = sav;
matchidx = stateidx;
break;
}
}
}
return match;
}
/*
* copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*.
* You must update these if need.
* OUT: 0: success.
* !0: failure.
*
* does not modify mbuf. does not free mbuf on error.
*/
static int
key_setsaval(sav, m, mhp)
struct secasvar *sav;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
#ifdef IPSEC_ESP
const struct esp_algorithm *algo;
#endif
int error = 0;
/* sanity check */
if (m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_setsaval: NULL pointer is passed.");
/* initialization */
sav->replay = NULL;
sav->key_auth = NULL;
sav->key_enc = NULL;
sav->sched = NULL;
sav->schedlen = 0;
sav->iv = NULL;
sav->lft_c = NULL;
sav->lft_h = NULL;
sav->lft_s = NULL;
/* SA */
if (mhp->ext[SADB_EXT_SA] != NULL) {
const struct sadb_sa *sa0;
sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) {
error = EINVAL;
goto fail;
}
sav->alg_auth = sa0->sadb_sa_auth;
sav->alg_enc = sa0->sadb_sa_encrypt;
sav->flags = sa0->sadb_sa_flags;
/* replay window */
if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) {
sav->replay = keydb_newsecreplay(sa0->sadb_sa_replay);
if (sav->replay == NULL) {
ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
error = ENOBUFS;
goto fail;
}
}
}
/* Authentication keys */
if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) {
const struct sadb_key *key0;
int len;
key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH];
len = mhp->extlen[SADB_EXT_KEY_AUTH];
error = 0;
if (len < sizeof(*key0)) {
error = EINVAL;
goto fail;
}
switch (mhp->msg->sadb_msg_satype) {
case SADB_SATYPE_AH:
case SADB_SATYPE_ESP:
case SADB_X_SATYPE_TCPSIGNATURE:
if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
sav->alg_auth != SADB_X_AALG_NULL)
error = EINVAL;
break;
case SADB_X_SATYPE_IPCOMP:
default:
error = EINVAL;
break;
}
if (error) {
ipseclog((LOG_DEBUG, "key_setsaval: invalid key_auth values.\n"));
goto fail;
}
sav->key_auth = (struct sadb_key *)key_newbuf(key0, len);
if (sav->key_auth == NULL) {
ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
error = ENOBUFS;
goto fail;
}
}
/* Encryption key */
if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) {
const struct sadb_key *key0;
int len;
key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT];
len = mhp->extlen[SADB_EXT_KEY_ENCRYPT];
error = 0;
if (len < sizeof(*key0)) {
error = EINVAL;
goto fail;
}
switch (mhp->msg->sadb_msg_satype) {
case SADB_SATYPE_ESP:
if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
sav->alg_enc != SADB_EALG_NULL) {
error = EINVAL;
break;
}
sav->key_enc = (struct sadb_key *)key_newbuf(key0, len);
if (sav->key_enc == NULL) {
ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
error = ENOBUFS;
goto fail;
}
break;
case SADB_X_SATYPE_IPCOMP:
if (len != PFKEY_ALIGN8(sizeof(struct sadb_key)))
error = EINVAL;
sav->key_enc = NULL; /*just in case*/
break;
case SADB_SATYPE_AH:
case SADB_X_SATYPE_TCPSIGNATURE:
default:
error = EINVAL;
break;
}
if (error) {
ipseclog((LOG_DEBUG, "key_setsatval: invalid key_enc value.\n"));
goto fail;
}
}
/* set iv */
sav->ivlen = 0;
switch (mhp->msg->sadb_msg_satype) {
case SADB_SATYPE_ESP:
#ifdef IPSEC_ESP
algo = esp_algorithm_lookup(sav->alg_enc);
if (algo && algo->ivlen)
sav->ivlen = (*algo->ivlen)(algo, sav);
if (sav->ivlen == 0)
break;
KMALLOC(sav->iv, caddr_t, sav->ivlen);
if (sav->iv == 0) {
ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
error = ENOBUFS;
goto fail;
}
/* initialize */
key_randomfill(sav->iv, sav->ivlen);
#endif
break;
case SADB_SATYPE_AH:
case SADB_X_SATYPE_IPCOMP:
case SADB_X_SATYPE_TCPSIGNATURE:
break;
default:
ipseclog((LOG_DEBUG, "key_setsaval: invalid SA type.\n"));
error = EINVAL;
goto fail;
}
/* reset created */
sav->created = time_second;
/* make lifetime for CURRENT */
KMALLOC(sav->lft_c, struct sadb_lifetime *,
sizeof(struct sadb_lifetime));
if (sav->lft_c == NULL) {
ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
error = ENOBUFS;
goto fail;
}
sav->lft_c->sadb_lifetime_len =
PFKEY_UNIT64(sizeof(struct sadb_lifetime));
sav->lft_c->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
sav->lft_c->sadb_lifetime_allocations = 0;
sav->lft_c->sadb_lifetime_bytes = 0;
sav->lft_c->sadb_lifetime_addtime = time_second;
sav->lft_c->sadb_lifetime_usetime = 0;
/* lifetimes for HARD and SOFT */
{
const struct sadb_lifetime *lft0;
lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
if (lft0 != NULL) {
if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) {
error = EINVAL;
goto fail;
}
sav->lft_h = (struct sadb_lifetime *)key_newbuf(lft0,
sizeof(*lft0));
if (sav->lft_h == NULL) {
ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
error = ENOBUFS;
goto fail;
}
/* we no longer support byte lifetime */
if (sav->lft_h->sadb_lifetime_bytes) {
error = EINVAL;
goto fail;
}
/* initialize? */
}
lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT];
if (lft0 != NULL) {
if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) {
error = EINVAL;
goto fail;
}
sav->lft_s = (struct sadb_lifetime *)key_newbuf(lft0,
sizeof(*lft0));
if (sav->lft_s == NULL) {
ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
error = ENOBUFS;
goto fail;
}
/* we no longer support byte lifetime */
if (sav->lft_s->sadb_lifetime_bytes) {
error = EINVAL;
goto fail;
}
/* initialize? */
}
}
return 0;
fail:
/* initialization */
if (sav->replay != NULL) {
keydb_delsecreplay(sav->replay);
sav->replay = NULL;
}
if (sav->key_auth != NULL) {
bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth));
KFREE(sav->key_auth);
sav->key_auth = NULL;
}
if (sav->key_enc != NULL) {
bzero(_KEYBUF(sav->key_enc), _KEYLEN(sav->key_enc));
KFREE(sav->key_enc);
sav->key_enc = NULL;
}
if (sav->sched) {
bzero(sav->sched, sav->schedlen);
KFREE(sav->sched);
sav->sched = NULL;
}
if (sav->iv != NULL) {
KFREE(sav->iv);
sav->iv = NULL;
}
if (sav->lft_c != NULL) {
KFREE(sav->lft_c);
sav->lft_c = NULL;
}
if (sav->lft_h != NULL) {
KFREE(sav->lft_h);
sav->lft_h = NULL;
}
if (sav->lft_s != NULL) {
KFREE(sav->lft_s);
sav->lft_s = NULL;
}
return error;
}
/*
* validation with a secasvar entry, and set SADB_SATYPE_MATURE.
* OUT: 0: valid
* other: errno
*/
static int
key_mature(sav)
struct secasvar *sav;
{
int mature;
int checkmask = 0; /* 2^0: ealg 2^1: aalg 2^2: calg */
int mustmask = 0; /* 2^0: ealg 2^1: aalg 2^2: calg */
mature = 0;
/* check SPI value */
switch (sav->sah->saidx.proto) {
case IPPROTO_ESP:
case IPPROTO_AH:
if (ntohl(sav->spi) >= 0 && ntohl(sav->spi) <= 255) {
ipseclog((LOG_DEBUG,
"key_mature: illegal range of SPI %u.\n",
(u_int32_t)ntohl(sav->spi)));
return EINVAL;
}
break;
}
/* check satype */
switch (sav->sah->saidx.proto) {
case IPPROTO_ESP:
/* check flags */
if ((sav->flags & SADB_X_EXT_OLD) &&
(sav->flags & SADB_X_EXT_DERIV)) {
ipseclog((LOG_DEBUG, "key_mature: "
"invalid flag (derived) given to old-esp.\n"));
return EINVAL;
}
if (sav->alg_auth == SADB_AALG_NONE)
checkmask = 1;
else
checkmask = 3;
mustmask = 1;
break;
case IPPROTO_AH:
/* check flags */
if (sav->flags & SADB_X_EXT_DERIV) {
ipseclog((LOG_DEBUG, "key_mature: "
"invalid flag (derived) given to AH SA.\n"));
return EINVAL;
}
if (sav->alg_enc != SADB_EALG_NONE) {
ipseclog((LOG_DEBUG, "key_mature: "
"protocol and algorithm mismated.\n"));
return (EINVAL);
}
checkmask = 2;
mustmask = 2;
break;
case IPPROTO_IPCOMP:
if (sav->alg_auth != SADB_AALG_NONE) {
ipseclog((LOG_DEBUG, "key_mature: "
"protocol and algorithm mismated.\n"));
return (EINVAL);
}
if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 &&
ntohl(sav->spi) >= 0x10000) {
ipseclog((LOG_DEBUG, "key_mature: invalid cpi for IPComp.\n"));
return (EINVAL);
}
checkmask = 4;
mustmask = 4;
break;
case IPPROTO_TCP:
if (sav->alg_auth != SADB_X_AALG_TCP_MD5) {
ipseclog((LOG_DEBUG, "key_mature: unsupported authentication algorithm %u\n",
sav->alg_auth));
return (EINVAL);
}
if (sav->alg_enc != SADB_EALG_NONE) {
ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
"mismated.\n", __func__));
return(EINVAL);
}
if (sav->spi != htonl(0x1000)) {
ipseclog((LOG_DEBUG, "key_mature: SPI must be TCP_SIG_SPI (0x1000)\n"));
return (EINVAL);
}
checkmask = 2;
mustmask = 2;
break;
default:
ipseclog((LOG_DEBUG, "key_mature: Invalid satype.\n"));
return EPROTONOSUPPORT;
}
/* check authentication algorithm */
if ((checkmask & 2) != 0) {
const struct ah_algorithm *algo;
int keylen;
algo = ah_algorithm_lookup(sav->alg_auth);
if (!algo) {
ipseclog((LOG_DEBUG, "key_mature: "
"unknown authentication algorithm.\n"));
return EINVAL;
}
/* algorithm-dependent check */
if (sav->key_auth)
keylen = sav->key_auth->sadb_key_bits;
else
keylen = 0;
if (keylen < algo->keymin || algo->keymax < keylen) {
ipseclog((LOG_DEBUG,
"key_mature: invalid AH key length %d "
"(%d-%d allowed)\n",
keylen, algo->keymin, algo->keymax));
return EINVAL;
}
if (algo->mature) {
if ((*algo->mature)(sav)) {
/* message generated in per-algorithm function*/
return EINVAL;
} else
mature = SADB_SATYPE_AH;
}
if ((mustmask & 2) != 0 && mature != SADB_SATYPE_AH) {
ipseclog((LOG_DEBUG, "key_mature: no satisfy algorithm for AH\n"));
return EINVAL;
}
}
/* check encryption algorithm */
if ((checkmask & 1) != 0) {
#ifdef IPSEC_ESP
const struct esp_algorithm *algo;
int keylen;
algo = esp_algorithm_lookup(sav->alg_enc);
if (!algo) {
ipseclog((LOG_DEBUG, "key_mature: unknown encryption algorithm.\n"));
return EINVAL;
}
/* algorithm-dependent check */
if (sav->key_enc)
keylen = sav->key_enc->sadb_key_bits;
else
keylen = 0;
if (keylen < algo->keymin || algo->keymax < keylen) {
ipseclog((LOG_DEBUG,
"key_mature: invalid ESP key length %d "
"(%d-%d allowed)\n",
keylen, algo->keymin, algo->keymax));
return EINVAL;
}
if (algo->mature) {
if ((*algo->mature)(sav)) {
/* message generated in per-algorithm function*/
return EINVAL;
} else
mature = SADB_SATYPE_ESP;
}
if ((mustmask & 1) != 0 && mature != SADB_SATYPE_ESP) {
ipseclog((LOG_DEBUG, "key_mature: no satisfy algorithm for ESP\n"));
return EINVAL;
}
#else /*IPSEC_ESP*/
ipseclog((LOG_DEBUG, "key_mature: ESP not supported in this configuration\n"));
return EINVAL;
#endif
}
/* check compression algorithm */
if ((checkmask & 4) != 0) {
const struct ipcomp_algorithm *algo;
/* algorithm-dependent check */
algo = ipcomp_algorithm_lookup(sav->alg_enc);
if (!algo) {
ipseclog((LOG_DEBUG, "key_mature: unknown compression algorithm.\n"));
return EINVAL;
}
}
key_sa_chgstate(sav, SADB_SASTATE_MATURE);
return 0;
}
/*
* subroutine for SADB_GET and SADB_DUMP.
*/
static struct mbuf *
key_setdumpsa(sav, type, satype, seq, pid)
struct secasvar *sav;
u_int8_t type, satype;
u_int32_t seq, pid;
{
struct mbuf *result = NULL, *tres = NULL, *m;
int l = 0;
int i;
void *p;
int dumporder[] = {
SADB_EXT_SA, SADB_X_EXT_SA2,
SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC,
SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH,
SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC,
SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY,
};
m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt);
if (m == NULL)
goto fail;
result = m;
for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) {
m = NULL;
p = NULL;
switch (dumporder[i]) {
case SADB_EXT_SA:
m = key_setsadbsa(sav);
if (!m)
goto fail;
break;
case SADB_X_EXT_SA2:
m = key_setsadbxsa2(sav->sah->saidx.mode,
sav->replay ? (sav->replay->count & 0xffffffff) : 0,
sav->sah->saidx.reqid);
if (!m)
goto fail;
break;
case SADB_EXT_ADDRESS_SRC:
m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
(struct sockaddr *)&sav->sah->saidx.src,
FULLMASK, IPSEC_ULPROTO_ANY);
if (!m)
goto fail;
break;
case SADB_EXT_ADDRESS_DST:
m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
(struct sockaddr *)&sav->sah->saidx.dst,
FULLMASK, IPSEC_ULPROTO_ANY);
if (!m)
goto fail;
break;
case SADB_EXT_KEY_AUTH:
if (!sav->key_auth)
continue;
l = PFKEY_UNUNIT64(sav->key_auth->sadb_key_len);
p = sav->key_auth;
break;
case SADB_EXT_KEY_ENCRYPT:
if (!sav->key_enc)
continue;
l = PFKEY_UNUNIT64(sav->key_enc->sadb_key_len);
p = sav->key_enc;
break;
case SADB_EXT_LIFETIME_CURRENT:
if (!sav->lft_c)
continue;
l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_c)->sadb_ext_len);
p = sav->lft_c;
break;
case SADB_EXT_LIFETIME_HARD:
if (!sav->lft_h)
continue;
l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_h)->sadb_ext_len);
p = sav->lft_h;
break;
case SADB_EXT_LIFETIME_SOFT:
if (!sav->lft_s)
continue;
l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_s)->sadb_ext_len);
p = sav->lft_s;
break;
case SADB_EXT_ADDRESS_PROXY:
case SADB_EXT_IDENTITY_SRC:
case SADB_EXT_IDENTITY_DST:
/* XXX: should we brought from SPD ? */
case SADB_EXT_SENSITIVITY:
default:
continue;
}
if ((!m && !p) || (m && p))
goto fail;
if (p && tres) {
M_PREPEND(tres, l, M_DONTWAIT);
if (!tres)
goto fail;
bcopy(p, mtod(tres, caddr_t), l);
continue;
}
if (p) {
m = key_alloc_mbuf(l);
if (!m)
goto fail;
m_copyback(m, 0, l, p);
}
if (tres)
m_cat(m, tres);
tres = m;
}
m_cat(result, tres);
if (result->m_len < sizeof(struct sadb_msg)) {
result = m_pullup(result, sizeof(struct sadb_msg));
if (result == NULL)
goto fail;
}
result->m_pkthdr.len = 0;
for (m = result; m; m = m->m_next)
result->m_pkthdr.len += m->m_len;
mtod(result, struct sadb_msg *)->sadb_msg_len =
PFKEY_UNIT64(result->m_pkthdr.len);
return result;
fail:
m_freem(result);
m_freem(tres);
return NULL;
}
/*
* set data into sadb_msg.
*/
static struct mbuf *
key_setsadbmsg(type, tlen, satype, seq, pid, reserved)
u_int8_t type, satype;
u_int16_t tlen;
u_int32_t seq;
pid_t pid;
u_int16_t reserved;
{
struct mbuf *m;
struct sadb_msg *p;
int len;
len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
if (len > MCLBYTES)
return NULL;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m && len > MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_freem(m);
m = NULL;
}
}
if (!m)
return NULL;
m->m_pkthdr.len = m->m_len = len;
m->m_next = NULL;
p = mtod(m, struct sadb_msg *);
bzero(p, len);
p->sadb_msg_version = PF_KEY_V2;
p->sadb_msg_type = type;
p->sadb_msg_errno = 0;
p->sadb_msg_satype = satype;
p->sadb_msg_len = PFKEY_UNIT64(tlen);
p->sadb_msg_reserved = reserved;
p->sadb_msg_seq = seq;
p->sadb_msg_pid = (u_int32_t)pid;
return m;
}
/*
* copy secasvar data into sadb_address.
*/
static struct mbuf *
key_setsadbsa(sav)
struct secasvar *sav;
{
struct mbuf *m;
struct sadb_sa *p;
int len;
len = PFKEY_ALIGN8(sizeof(struct sadb_sa));
m = key_alloc_mbuf(len);
if (!m || m->m_next) { /*XXX*/
if (m)
m_freem(m);
return NULL;
}
p = mtod(m, struct sadb_sa *);
bzero(p, len);
p->sadb_sa_len = PFKEY_UNIT64(len);
p->sadb_sa_exttype = SADB_EXT_SA;
p->sadb_sa_spi = sav->spi;
p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0);
p->sadb_sa_state = sav->state;
p->sadb_sa_auth = sav->alg_auth;
p->sadb_sa_encrypt = sav->alg_enc;
p->sadb_sa_flags = sav->flags;
return m;
}
/*
* set data into sadb_address.
*/
static struct mbuf *
key_setsadbaddr(exttype, saddr, prefixlen, ul_proto)
u_int16_t exttype;
struct sockaddr *saddr;
u_int8_t prefixlen;
u_int16_t ul_proto;
{
struct mbuf *m;
struct sadb_address *p;
size_t len;
len = PFKEY_ALIGN8(sizeof(struct sadb_address)) +
PFKEY_ALIGN8(saddr->sa_len);
m = key_alloc_mbuf(len);
if (!m || m->m_next) { /*XXX*/
if (m)
m_freem(m);
return NULL;
}
p = mtod(m, struct sadb_address *);
bzero(p, len);
p->sadb_address_len = PFKEY_UNIT64(len);
p->sadb_address_exttype = exttype;
p->sadb_address_proto = ul_proto;
if (prefixlen == FULLMASK) {
switch (saddr->sa_family) {
case AF_INET:
prefixlen = sizeof(struct in_addr) << 3;
break;
case AF_INET6:
prefixlen = sizeof(struct in6_addr) << 3;
break;
default:
; /*XXX*/
}
}
p->sadb_address_prefixlen = prefixlen;
p->sadb_address_reserved = 0;
bcopy(saddr,
mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)),
saddr->sa_len);
return m;
}
#if 0
/*
* set data into sadb_ident.
*/
static struct mbuf *
key_setsadbident(exttype, idtype, string, stringlen, id)
u_int16_t exttype, idtype;
caddr_t string;
int stringlen;
u_int64_t id;
{
struct mbuf *m;
struct sadb_ident *p;
size_t len;
len = PFKEY_ALIGN8(sizeof(struct sadb_ident)) + PFKEY_ALIGN8(stringlen);
m = key_alloc_mbuf(len);
if (!m || m->m_next) { /*XXX*/
if (m)
m_freem(m);
return NULL;
}
p = mtod(m, struct sadb_ident *);
bzero(p, len);
p->sadb_ident_len = PFKEY_UNIT64(len);
p->sadb_ident_exttype = exttype;
p->sadb_ident_type = idtype;
p->sadb_ident_reserved = 0;
p->sadb_ident_id = id;
bcopy(string,
mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_ident)),
stringlen);
return m;
}
#endif
/*
* set data into sadb_x_sa2.
*/
static struct mbuf *
key_setsadbxsa2(mode, seq, reqid)
u_int8_t mode;
u_int32_t seq, reqid;
{
struct mbuf *m;
struct sadb_x_sa2 *p;
size_t len;
len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2));
m = key_alloc_mbuf(len);
if (!m || m->m_next) { /*XXX*/
if (m)
m_freem(m);
return NULL;
}
p = mtod(m, struct sadb_x_sa2 *);
bzero(p, len);
p->sadb_x_sa2_len = PFKEY_UNIT64(len);
p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
p->sadb_x_sa2_mode = mode;
p->sadb_x_sa2_reserved1 = 0;
p->sadb_x_sa2_reserved2 = 0;
p->sadb_x_sa2_sequence = seq;
p->sadb_x_sa2_reqid = reqid;
return m;
}
/*
* set data into sadb_lifetime
*/
static struct mbuf *
key_setsadblifetime(type, alloc, bytes, addtime, usetime)
u_int16_t type;
u_int32_t alloc;
u_int64_t bytes, addtime, usetime;
{
struct mbuf *m;
struct sadb_lifetime *p;
size_t len;
len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime));
m = key_alloc_mbuf(len);
if (!m || m->m_next) { /*XXX*/
if (m)
m_freem(m);
return NULL;
}
p = mtod(m, struct sadb_lifetime *);
bzero(p, len);
p->sadb_lifetime_len = PFKEY_UNIT64(len);
p->sadb_lifetime_exttype = type;
p->sadb_lifetime_allocations = alloc;
p->sadb_lifetime_bytes = bytes;
p->sadb_lifetime_addtime = addtime;
p->sadb_lifetime_usetime = usetime;
return m;
}
/*
* set data into sadb_x_policy
*/
static struct mbuf *
key_setsadbxpolicy(type, dir, id)
u_int16_t type;
u_int8_t dir;
u_int32_t id;
{
struct mbuf *m;
struct sadb_x_policy *p;
size_t len;
len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy));
m = key_alloc_mbuf(len);
if (!m || m->m_next) { /*XXX*/
if (m)
m_freem(m);
return NULL;
}
p = mtod(m, struct sadb_x_policy *);
bzero(p, len);
p->sadb_x_policy_len = PFKEY_UNIT64(len);
p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
p->sadb_x_policy_type = type;
p->sadb_x_policy_dir = dir;
p->sadb_x_policy_id = id;
return m;
}
/* %%% utilities */
/*
* copy a buffer into the new buffer allocated.
*/
static void *
key_newbuf(src, len)
const void *src;
u_int len;
{
caddr_t new;
KMALLOC(new, caddr_t, len);
if (new == NULL) {
ipseclog((LOG_DEBUG, "key_newbuf: No more memory.\n"));
return NULL;
}
bcopy(src, new, len);
return new;
}
/* compare my own address
* OUT: 1: true, i.e. my address.
* 0: false
*/
static int
key_ismyaddr(sa)
struct sockaddr *sa;
{
#ifdef INET
struct sockaddr_in *sin;
struct in_ifaddr *ia;
#endif
/* sanity check */
if (sa == NULL)
panic("key_ismyaddr: NULL pointer is passed.");
switch (sa->sa_family) {
#ifdef INET
case AF_INET:
sin = (struct sockaddr_in *)sa;
for (ia = in_ifaddrhead.tqh_first; ia;
ia = ia->ia_link.tqe_next)
{
if (sin->sin_family == ia->ia_addr.sin_family &&
sin->sin_len == ia->ia_addr.sin_len &&
sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
{
return 1;
}
}
break;
#endif
#ifdef INET6
case AF_INET6:
return key_ismyaddr6((struct sockaddr_in6 *)sa);
#endif
}
return 0;
}
#ifdef INET6
/*
* compare my own address for IPv6.
* 1: ours
* 0: other
* NOTE: derived ip6_input() in KAME. This is necessary to modify more.
*/
#include <netinet6/in6_var.h>
static int
key_ismyaddr6(sin6)
struct sockaddr_in6 *sin6;
{
struct in6_ifaddr *ia;
struct in6_multi *in6m;
if (sa6_embedscope(sin6, 0) != 0)
return 0;
for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
if (key_sockaddrcmp((struct sockaddr *)&sin6,
(struct sockaddr *)&ia->ia_addr, 0) == 0)
return 1;
/*
* XXX Multicast
* XXX why do we care about multlicast here while we don't care
* about IPv4 multicast??
*/
in6m = NULL;
IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m);
if (in6m)
return 1;
}
/* loopback, just for safety */
if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
return 1;
return 0;
}
#endif /*INET6*/
/*
* compare two secasindex structure.
* flag can specify to compare 2 saidxes.
* compare two secasindex structure without both mode and reqid.
* don't compare port.
* IN:
* saidx0: source, it can be in SAD.
* saidx1: object.
* OUT:
* 1 : equal
* 0 : not equal
*/
static int
key_cmpsaidx(saidx0, saidx1, flag)
struct secasindex *saidx0, *saidx1;
int flag;
{
/* sanity */
if (saidx0 == NULL && saidx1 == NULL)
return 1;
if (saidx0 == NULL || saidx1 == NULL)
return 0;
if (saidx0->proto != saidx1->proto)
return 0;
if (flag == CMP_EXACTLY) {
if (saidx0->mode != saidx1->mode)
return 0;
if (saidx0->reqid != saidx1->reqid)
return 0;
if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.ss_len) != 0 ||
bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.ss_len) != 0)
return 0;
} else {
/* CMP_MODE_REQID, CMP_HEAD */
if (flag == CMP_MODE_REQID) {
/*
* If reqid of SPD is non-zero, unique SA is required.
* The result must be of same reqid in this case.
*/
if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid)
return 0;
}
if (flag == CMP_MODE_REQID) {
if (saidx0->mode != IPSEC_MODE_ANY &&
saidx0->mode != saidx1->mode)
return 0;
}
if (key_sockaddrcmp((struct sockaddr *)&saidx0->src,
(struct sockaddr *)&saidx1->src, 0) != 0) {
return 0;
}
if (key_sockaddrcmp((struct sockaddr *)&saidx0->dst,
(struct sockaddr *)&saidx1->dst, 0) != 0) {
return 0;
}
}
return 1;
}
/*
* compare two secindex structure exactly.
* IN:
* spidx0: source, it is often in SPD.
* spidx1: object, it is often from PFKEY message.
* OUT:
* 1 : equal
* 0 : not equal
*/
int
key_cmpspidx_exactly(spidx0, spidx1)
struct secpolicyindex *spidx0, *spidx1;
{
/* sanity */
if (spidx0 == NULL && spidx1 == NULL)
return 1;
if (spidx0 == NULL || spidx1 == NULL)
return 0;
if (spidx0->prefs != spidx1->prefs || spidx0->prefd != spidx1->prefd ||
spidx0->ul_proto != spidx1->ul_proto)
return 0;
if (key_sockaddrcmp((struct sockaddr *)&spidx0->src,
(struct sockaddr *)&spidx1->src, 1) != 0) {
return 0;
}
if (key_sockaddrcmp((struct sockaddr *)&spidx0->dst,
(struct sockaddr *)&spidx1->dst, 1) != 0) {
return 0;
}
return 1;
}
/*
* compare two secindex structure with mask.
* IN:
* spidx0: source, it is often in SPD.
* spidx1: object, it is often from IP header.
* OUT:
* 1 : equal
* 0 : not equal
*/
int
key_cmpspidx_withmask(spidx0, spidx1)
struct secpolicyindex *spidx0, *spidx1;
{
/* sanity */
if (spidx0 == NULL && spidx1 == NULL)
return 1;
if (spidx0 == NULL || spidx1 == NULL)
return 0;
if (spidx0->src.ss_family != spidx1->src.ss_family ||
spidx0->dst.ss_family != spidx1->dst.ss_family ||
spidx0->src.ss_len != spidx1->src.ss_len ||
spidx0->dst.ss_len != spidx1->dst.ss_len)
return 0;
/* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */
if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY &&
spidx0->ul_proto != spidx1->ul_proto)
return 0;
switch (spidx0->src.ss_family) {
case AF_INET:
if (satosin(&spidx0->src)->sin_port != IPSEC_PORT_ANY &&
satosin(&spidx0->src)->sin_port !=
satosin(&spidx1->src)->sin_port)
return 0;
if (!key_bbcmp((caddr_t)&satosin(&spidx0->src)->sin_addr,
(caddr_t)&satosin(&spidx1->src)->sin_addr, spidx0->prefs))
return 0;
break;
case AF_INET6:
if (satosin6(&spidx0->src)->sin6_port != IPSEC_PORT_ANY &&
satosin6(&spidx0->src)->sin6_port !=
satosin6(&spidx1->src)->sin6_port)
return 0;
/*
* scope_id check. if sin6_scope_id is 0, we regard it
* as a wildcard scope, which matches any scope zone ID.
*/
if (satosin6(&spidx0->src)->sin6_scope_id &&
satosin6(&spidx1->src)->sin6_scope_id &&
satosin6(&spidx0->src)->sin6_scope_id !=
satosin6(&spidx1->src)->sin6_scope_id)
return 0;
if (!key_bbcmp((caddr_t)&satosin6(&spidx0->src)->sin6_addr,
(caddr_t)&satosin6(&spidx1->src)->sin6_addr, spidx0->prefs))
return 0;
break;
default:
/* XXX */
if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.ss_len) != 0)
return 0;
break;
}
switch (spidx0->dst.ss_family) {
case AF_INET:
if (satosin(&spidx0->dst)->sin_port != IPSEC_PORT_ANY &&
satosin(&spidx0->dst)->sin_port !=
satosin(&spidx1->dst)->sin_port)
return 0;
if (!key_bbcmp((caddr_t)&satosin(&spidx0->dst)->sin_addr,
(caddr_t)&satosin(&spidx1->dst)->sin_addr, spidx0->prefd))
return 0;
break;
case AF_INET6:
if (satosin6(&spidx0->dst)->sin6_port != IPSEC_PORT_ANY &&
satosin6(&spidx0->dst)->sin6_port !=
satosin6(&spidx1->dst)->sin6_port)
return 0;
/*
* scope_id check. if sin6_scope_id is 0, we regard it
* as a wildcard scope, which matches any scope zone ID.
*/
if (satosin6(&spidx0->src)->sin6_scope_id &&
satosin6(&spidx1->src)->sin6_scope_id &&
satosin6(&spidx0->dst)->sin6_scope_id !=
satosin6(&spidx1->dst)->sin6_scope_id)
return 0;
if (!key_bbcmp((caddr_t)&satosin6(&spidx0->dst)->sin6_addr,
(caddr_t)&satosin6(&spidx1->dst)->sin6_addr, spidx0->prefd))
return 0;
break;
default:
/* XXX */
if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.ss_len) != 0)
return 0;
break;
}
/* XXX Do we check other field ? e.g. flowinfo */
return 1;
}
/* returns 0 on match */
static int
key_sockaddrcmp(sa1, sa2, port)
struct sockaddr *sa1;
struct sockaddr *sa2;
int port;
{
if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
return 1;
switch (sa1->sa_family) {
case AF_INET:
if (sa1->sa_len != sizeof(struct sockaddr_in))
return 1;
if (satosin(sa1)->sin_addr.s_addr !=
satosin(sa2)->sin_addr.s_addr) {
return 1;
}
if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port)
return 1;
break;
case AF_INET6:
if (sa1->sa_len != sizeof(struct sockaddr_in6))
return 1; /*EINVAL*/
if (satosin6(sa1)->sin6_scope_id !=
satosin6(sa2)->sin6_scope_id) {
return 1;
}
if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr,
&satosin6(sa2)->sin6_addr)) {
return 1;
}
if (port &&
satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) {
return 1;
}
break;
default:
if (bcmp(sa1, sa2, sa1->sa_len) != 0)
return 1;
break;
}
return 0;
}
/*
* compare two buffers with mask.
* IN:
* addr1: source
* addr2: object
* bits: Number of bits to compare
* OUT:
* 1 : equal
* 0 : not equal
*/
static int
key_bbcmp(p1, p2, bits)
caddr_t p1, p2;
u_int bits;
{
u_int8_t mask;
/* XXX: This could be considerably faster if we compare a word
* at a time, but it is complicated on LSB Endian machines */
/* Handle null pointers */
if (p1 == NULL || p2 == NULL)
return (p1 == p2);
while (bits >= 8) {
if (*p1++ != *p2++)
return 0;
bits -= 8;
}
if (bits > 0) {
mask = ~((1<<(8-bits))-1);
if ((*p1 & mask) != (*p2 & mask))
return 0;
}
return 1; /* Match! */
}
/*
* time handler.
* scanning SPD and SAD to check status for each entries,
* and do to remove or to expire.
* XXX: year 2038 problem may remain.
*/
void
key_timehandler(arg)
void *arg;
{
u_int dir;
int s;
struct timeval tv;
microtime(&tv);
s = splnet(); /*called from softclock()*/
/* SPD */
{
struct secpolicy *sp, *nextsp;
for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
for (sp = LIST_FIRST(&sptree[dir]);
sp != NULL;
sp = nextsp) {
nextsp = LIST_NEXT(sp, chain);
if (sp->state == IPSEC_SPSTATE_DEAD) {
key_sp_unlink(sp); /*XXX*/
sp = NULL;
continue;
}
if (sp->lifetime == 0 && sp->validtime == 0)
continue;
/* the deletion will occur next time */
if ((sp->lifetime &&
tv.tv_sec - sp->created > sp->lifetime) ||
(sp->validtime &&
tv.tv_sec - sp->lastused > sp->validtime)) {
key_sp_dead(sp);
key_spdexpire(sp);
continue;
}
}
}
/* invalidate all cached SPD pointers on pcb */
ipsec_invalpcbcacheall();
}
/* SAD */
{
struct secashead *sah, *nextsah;
struct secasvar *sav, *nextsav;
for (sah = LIST_FIRST(&sahtree);
sah != NULL;
sah = nextsah) {
nextsah = LIST_NEXT(sah, chain);
/* if sah has been dead, then delete it and process next sah. */
if (sah->state == SADB_SASTATE_DEAD) {
key_delsah(sah);
continue;
}
/* if LARVAL entry doesn't become MATURE, delete it. */
for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_LARVAL]);
sav != NULL;
sav = nextsav) {
nextsav = LIST_NEXT(sav, chain);
if (tv.tv_sec - sav->created > key_larval_lifetime) {
key_freesav(sav);
}
}
/*
* check MATURE entry to start to send expire message
* whether or not.
*/
for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_MATURE]);
sav != NULL;
sav = nextsav) {
nextsav = LIST_NEXT(sav, chain);
/* we don't need to check. */
if (sav->lft_s == NULL)
continue;
/* sanity check */
if (sav->lft_c == NULL) {
ipseclog((LOG_DEBUG, "key_timehandler: "
"There is no CURRENT time, why?\n"));
continue;
}
/* check SOFT lifetime */
if (sav->lft_s->sadb_lifetime_addtime != 0 &&
tv.tv_sec - sav->created > sav->lft_s->sadb_lifetime_addtime) {
/*
* check the SA if it has been used.
* when it hasn't been used, delete it.
* i don't think such SA will be used.
*/
if (sav->lft_c->sadb_lifetime_usetime == 0) {
key_sa_chgstate(sav, SADB_SASTATE_DEAD);
key_freesav(sav);
sav = NULL;
} else {
key_sa_chgstate(sav, SADB_SASTATE_DYING);
/*
* XXX If we keep to send expire
* message in the status of
* DYING. Do remove below code.
*/
key_expire(sav);
}
}
/* check SOFT lifetime by bytes */
/*
* XXX I don't know the way to delete this SA
* when new SA is installed. Caution when it's
* installed too big lifetime by time.
*/
else if (sav->lft_s->sadb_lifetime_bytes != 0
&& sav->lft_s->sadb_lifetime_bytes < sav->lft_c->sadb_lifetime_bytes) {
key_sa_chgstate(sav, SADB_SASTATE_DYING);
/*
* XXX If we keep to send expire
* message in the status of
* DYING. Do remove below code.
*/
key_expire(sav);
}
}
/* check DYING entry to change status to DEAD. */
for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_DYING]);
sav != NULL;
sav = nextsav) {
nextsav = LIST_NEXT(sav, chain);
/* we don't need to check. */
if (sav->lft_h == NULL)
continue;
/* sanity check */
if (sav->lft_c == NULL) {
ipseclog((LOG_DEBUG, "key_timehandler: "
"There is no CURRENT time, why?\n"));
continue;
}
if (sav->lft_h->sadb_lifetime_addtime != 0 &&
tv.tv_sec - sav->created > sav->lft_h->sadb_lifetime_addtime) {
key_sa_chgstate(sav, SADB_SASTATE_DEAD);
key_freesav(sav);
sav = NULL;
}
#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */
else if (sav->lft_s != NULL
&& sav->lft_s->sadb_lifetime_addtime != 0
&& tv.tv_sec - sav->created > sav->lft_s->sadb_lifetime_addtime) {
/*
* XXX: should be checked to be
* installed the valid SA.
*/
/*
* If there is no SA then sending
* expire message.
*/
key_expire(sav);
}
#endif
/* check HARD lifetime by bytes */
else if (sav->lft_h->sadb_lifetime_bytes != 0
&& sav->lft_h->sadb_lifetime_bytes < sav->lft_c->sadb_lifetime_bytes) {
key_sa_chgstate(sav, SADB_SASTATE_DEAD);
key_freesav(sav);
sav = NULL;
}
}
/* delete entry in DEAD */
for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_DEAD]);
sav != NULL;
sav = nextsav) {
nextsav = LIST_NEXT(sav, chain);
/* sanity check */
if (sav->state != SADB_SASTATE_DEAD) {
ipseclog((LOG_DEBUG, "key_timehandler: "
"invalid sav->state "
"(queue: %u SA: %u): "
"kill it anyway\n",
SADB_SASTATE_DEAD, sav->state));
}
/*
* do not call key_freesav() here.
* sav should already be freed, and sav->refcnt
* shows other references to sav
* (such as from SPD).
*/
}
}
}
#ifndef IPSEC_NONBLOCK_ACQUIRE
/* ACQ tree */
{
struct secacq *acq, *nextacq;
for (acq = LIST_FIRST(&acqtree);
acq != NULL;
acq = nextacq) {
nextacq = LIST_NEXT(acq, chain);
if (tv.tv_sec - acq->created > key_blockacq_lifetime &&
__LIST_CHAINED(acq)) {
LIST_REMOVE(acq, chain);
KFREE(acq);
}
}
}
#endif
/* SP ACQ tree */
{
struct secspacq *acq, *nextacq;
for (acq = LIST_FIRST(&spacqtree);
acq != NULL;
acq = nextacq) {
nextacq = LIST_NEXT(acq, chain);
if (tv.tv_sec - acq->created > key_blockacq_lifetime &&
__LIST_CHAINED(acq)) {
LIST_REMOVE(acq, chain);
KFREE(acq);
}
}
}
/*
* should set timeout based on the most closest timer expiration.
* we don't bother to do that yet.
*/
callout_reset(&key_timehandler_ch, hz, key_timehandler, (void *)0);
splx(s);
return;
}
static u_long
key_random()
{
u_long value;
key_randomfill(&value, sizeof(value));
return value;
}
void
key_randomfill(p, l)
void *p;
size_t l;
{
size_t n;
u_long v;
static int warn = 1;
n = 0;
n = (size_t)read_random(p, (u_int)l);
/* last resort */
while (n < l) {
v = random();
bcopy(&v, (u_int8_t *)p + n,
l - n < sizeof(v) ? l - n : sizeof(v));
n += sizeof(v);
if (warn) {
printf("WARNING: pseudo-random number generator "
"used for IPsec processing\n");
warn = 0;
}
}
}
/*
* map SADB_SATYPE_* to IPPROTO_*.
* if satype == SADB_SATYPE then satype is mapped to ~0.
* OUT:
* 0: invalid satype.
*/
static u_int16_t
key_satype2proto(satype)
u_int8_t satype;
{
switch (satype) {
case SADB_SATYPE_UNSPEC:
return IPSEC_PROTO_ANY;
case SADB_SATYPE_AH:
return IPPROTO_AH;
case SADB_SATYPE_ESP:
return IPPROTO_ESP;
case SADB_X_SATYPE_IPCOMP:
return IPPROTO_IPCOMP;
case SADB_X_SATYPE_TCPSIGNATURE:
return IPPROTO_TCP;
default:
return 0;
}
/* NOTREACHED */
}
/*
* map IPPROTO_* to SADB_SATYPE_*
* OUT:
* 0: invalid protocol type.
*/
static u_int8_t
key_proto2satype(proto)
u_int16_t proto;
{
switch (proto) {
case IPPROTO_AH:
return SADB_SATYPE_AH;
case IPPROTO_ESP:
return SADB_SATYPE_ESP;
case IPPROTO_IPCOMP:
return SADB_X_SATYPE_IPCOMP;
case IPPROTO_TCP:
return SADB_X_SATYPE_TCPSIGNATURE;
default:
return 0;
}
/* NOTREACHED */
}
/* %%% PF_KEY */
/*
* SADB_GETSPI processing is to receive
* <base, (SA2), src address, dst address, (SPI range)>
* from the IKMPd, to assign a unique spi value, to hang on the INBOUND
* tree with the status of LARVAL, and send
* <base, SA(*), address(SD)>
* to the IKMPd.
*
* IN: mhp: pointer to the pointer to each header.
* OUT: NULL if fail.
* other if success, return pointer to the message to send.
*/
static int
key_getspi(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct sadb_address *src0, *dst0;
struct secasindex saidx;
struct secashead *newsah;
struct secasvar *newsav;
u_int8_t proto;
u_int32_t spi;
u_int8_t mode;
u_int32_t reqid;
int error;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_getspi: NULL pointer is passed.");
if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
} else {
mode = IPSEC_MODE_ANY;
reqid = 0;
}
src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "key_getspi: invalid satype is passed.\n"));
return key_senderror(so, m, EINVAL);
}
/* make sure if port number is zero. */
switch (((struct sockaddr *)(src0 + 1))->sa_family) {
case AF_INET:
if (((struct sockaddr *)(src0 + 1))->sa_len !=
sizeof(struct sockaddr_in))
return key_senderror(so, m, EINVAL);
((struct sockaddr_in *)(src0 + 1))->sin_port = 0;
break;
case AF_INET6:
if (((struct sockaddr *)(src0 + 1))->sa_len !=
sizeof(struct sockaddr_in6))
return key_senderror(so, m, EINVAL);
((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0;
break;
default:
; /*???*/
}
switch (((struct sockaddr *)(dst0 + 1))->sa_family) {
case AF_INET:
if (((struct sockaddr *)(dst0 + 1))->sa_len !=
sizeof(struct sockaddr_in))
return key_senderror(so, m, EINVAL);
((struct sockaddr_in *)(dst0 + 1))->sin_port = 0;
break;
case AF_INET6:
if (((struct sockaddr *)(dst0 + 1))->sa_len !=
sizeof(struct sockaddr_in6))
return key_senderror(so, m, EINVAL);
((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0;
break;
default:
; /*???*/
}
/* XXX boundary check against sa_len */
KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
/* SPI allocation */
spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE],
&saidx);
if (spi == 0)
return key_senderror(so, m, EINVAL);
/* get a SA index */
if ((newsah = key_getsah(&saidx)) == NULL) {
/* create a new SA index */
if ((newsah = key_newsah(&saidx)) == NULL) {
ipseclog((LOG_DEBUG, "key_getspi: No more memory.\n"));
return key_senderror(so, m, ENOBUFS);
}
}
/* get a new SA */
/* XXX rewrite */
newsav = key_newsav(m, mhp, newsah, &error);
if (newsav == NULL) {
/* XXX don't free new SA index allocated in above. */
return key_senderror(so, m, error);
}
/* set spi */
key_setspi(newsav, htonl(spi));
#ifndef IPSEC_NONBLOCK_ACQUIRE
/* delete the entry in acqtree */
if (mhp->msg->sadb_msg_seq != 0) {
struct secacq *acq;
if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) {
/* reset counter in order to deletion by timehandler. */
acq->created = time_second;
acq->count = 0;
}
}
#endif
{
struct mbuf *n, *nn;
struct sadb_sa *m_sa;
struct sadb_msg *newmsg;
int off, len;
/* create new sadb_msg to reply. */
len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) +
PFKEY_ALIGN8(sizeof(struct sadb_sa));
if (len > MCLBYTES)
return key_senderror(so, m, ENOBUFS);
MGETHDR(n, M_DONTWAIT, MT_DATA);
if (len > MHLEN) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_freem(n);
n = NULL;
}
}
if (!n)
return key_senderror(so, m, ENOBUFS);
n->m_len = len;
n->m_next = NULL;
off = 0;
m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off);
m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa));
m_sa->sadb_sa_exttype = SADB_EXT_SA;
m_sa->sadb_sa_spi = htonl(spi);
off += PFKEY_ALIGN8(sizeof(struct sadb_sa));
#ifdef DIAGNOSTIC
if (off != len)
panic("length inconsistency in key_getspi");
#endif
n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC,
SADB_EXT_ADDRESS_DST);
if (!n->m_next) {
m_freem(n);
return key_senderror(so, m, ENOBUFS);
}
if (n->m_len < sizeof(struct sadb_msg)) {
n = m_pullup(n, sizeof(struct sadb_msg));
if (n == NULL)
return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
}
n->m_pkthdr.len = 0;
for (nn = n; nn; nn = nn->m_next)
n->m_pkthdr.len += nn->m_len;
newmsg = mtod(n, struct sadb_msg *);
newmsg->sadb_msg_seq = newsav->seq;
newmsg->sadb_msg_errno = 0;
newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
}
}
/*
* allocating new SPI
* called by key_getspi().
* OUT:
* 0: failure.
* others: success.
*/
static u_int32_t
key_do_getnewspi(spirange, saidx)
struct sadb_spirange *spirange;
struct secasindex *saidx;
{
u_int32_t newspi;
u_int32_t min, max;
int count = key_spi_trycnt;
/* set spi range to allocate */
if (spirange != NULL) {
min = spirange->sadb_spirange_min;
max = spirange->sadb_spirange_max;
} else {
min = key_spi_minval;
max = key_spi_maxval;
}
/* IPCOMP needs 2-byte SPI */
if (saidx->proto == IPPROTO_IPCOMP) {
u_int32_t t;
if (min >= 0x10000)
min = 0xffff;
if (max >= 0x10000)
max = 0xffff;
if (min > max) {
t = min; min = max; max = t;
}
}
if (min == max) {
if (key_checkspidup(saidx, min) != NULL) {
ipseclog((LOG_DEBUG, "key_do_getnewspi: SPI %u exists already.\n", min));
return 0;
}
count--; /* taking one cost. */
newspi = min;
} else {
/* init SPI */
newspi = 0;
/* when requesting to allocate spi ranged */
while (count--) {
/* generate pseudo-random SPI value ranged. */
newspi = min + (key_random() % (max - min + 1));
if (key_checkspidup(saidx, newspi) == NULL)
break;
}
if (count == 0 || newspi == 0) {
ipseclog((LOG_DEBUG, "key_do_getnewspi: to allocate spi is failed.\n"));
return 0;
}
}
/* statistics */
keystat.getspi_count =
(keystat.getspi_count + key_spi_trycnt - count) / 2;
return newspi;
}
/*
* SADB_UPDATE processing
* receive
* <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
* key(AE), (identity(SD),) (sensitivity)>
* from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL.
* and send
* <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
* (identity(SD),) (sensitivity)>
* to the ikmpd.
*
* m will always be freed.
*/
static int
key_update(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct sadb_sa *sa0;
struct sadb_address *src0, *dst0;
struct secasindex saidx;
struct secashead *sah;
struct secasvar *sav;
u_int16_t proto;
u_int8_t mode;
u_int32_t reqid;
int error;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_update: NULL pointer is passed.");
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "key_update: invalid satype is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->ext[SADB_EXT_SA] == NULL ||
mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
(mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
(mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
(mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
(mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
} else {
mode = IPSEC_MODE_ANY;
reqid = 0;
}
/* XXX boundary checking for other extensions */
sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
/* XXX boundary check against sa_len */
KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
/* get a SA header */
if ((sah = key_getsah(&saidx)) == NULL) {
ipseclog((LOG_DEBUG, "key_update: no SA index found.\n"));
return key_senderror(so, m, ENOENT);
}
/* set spidx if there */
/* XXX rewrite */
error = key_setident(sah, m, mhp);
if (error)
return key_senderror(so, m, error);
/* find a SA with sequence number. */
#ifdef IPSEC_DOSEQCHECK
if (mhp->msg->sadb_msg_seq != 0 &&
(sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) {
ipseclog((LOG_DEBUG,
"key_update: no larval SA with sequence %u exists.\n",
mhp->msg->sadb_msg_seq));
return key_senderror(so, m, ENOENT);
}
#else
if ((sav = key_getsavbyspi(sah, sa0->sadb_sa_spi)) == NULL) {
ipseclog((LOG_DEBUG,
"key_update: no such a SA found (spi:%u)\n",
(u_int32_t)ntohl(sa0->sadb_sa_spi)));
return key_senderror(so, m, EINVAL);
}
#endif
/* validity check */
if (sav->sah->saidx.proto != proto) {
ipseclog((LOG_DEBUG,
"key_update: protocol mismatched (DB=%u param=%u)\n",
sav->sah->saidx.proto, proto));
return key_senderror(so, m, EINVAL);
}
#ifdef IPSEC_DOSEQCHECK
if (sav->spi != sa0->sadb_sa_spi) {
ipseclog((LOG_DEBUG,
"key_update: SPI mismatched (DB:%u param:%u)\n",
(u_int32_t)ntohl(sav->spi),
(u_int32_t)ntohl(sa0->sadb_sa_spi)));
return key_senderror(so, m, EINVAL);
}
#endif
if (sav->pid != mhp->msg->sadb_msg_pid) {
ipseclog((LOG_DEBUG,
"key_update: pid mismatched (DB:%u param:%u)\n",
sav->pid, mhp->msg->sadb_msg_pid));
return key_senderror(so, m, EINVAL);
}
/* copy sav values */
error = key_setsaval(sav, m, mhp);
if (error) {
key_freesav(sav);
return key_senderror(so, m, error);
}
/* check SA values to be mature. */
if ((error = key_mature(sav)) != 0) {
key_freesav(sav);
return key_senderror(so, m, error);
}
{
struct mbuf *n;
/* set msg buf from mhp */
n = key_getmsgbuf_x1(m, mhp);
if (n == NULL) {
ipseclog((LOG_DEBUG, "key_update: No more memory.\n"));
return key_senderror(so, m, ENOBUFS);
}
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
}
}
/*
* search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL.
* only called by key_update().
* OUT:
* NULL : not found
* others : found, pointer to a SA.
*/
#ifdef IPSEC_DOSEQCHECK
static struct secasvar *
key_getsavbyseq(sah, seq)
struct secashead *sah;
u_int32_t seq;
{
struct secasvar *sav;
u_int state;
state = SADB_SASTATE_LARVAL;
/* search SAD with sequence number ? */
LIST_FOREACH(sav, &sah->savtree[state], chain) {
KEY_CHKSASTATE(state, sav->state, "key_getsabyseq");
if (sav->seq == seq) {
sav->refcnt++;
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP key_getsavbyseq cause "
"refcnt++:%d SA:%p\n",
sav->refcnt, sav));
return sav;
}
}
return NULL;
}
#endif
/*
* SADB_ADD processing
* add an entry to SA database, when received
* <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
* key(AE), (identity(SD),) (sensitivity)>
* from the ikmpd,
* and send
* <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
* (identity(SD),) (sensitivity)>
* to the ikmpd.
*
* IGNORE identity and sensitivity messages.
*
* m will always be freed.
*/
static int
key_add(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct sadb_sa *sa0;
struct sadb_address *src0, *dst0;
struct secasindex saidx;
struct secashead *newsah;
struct secasvar *newsav;
u_int16_t proto;
u_int8_t mode;
u_int32_t reqid;
int error;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_add: NULL pointer is passed.");
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "key_add: invalid satype is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->ext[SADB_EXT_SA] == NULL ||
mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
(mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
(mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
(mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
(mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
/* XXX need more */
ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
} else {
mode = IPSEC_MODE_ANY;
reqid = 0;
}
sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
/* XXX boundary check against sa_len */
KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
/* get a SA header */
if ((newsah = key_getsah(&saidx)) == NULL) {
/* create a new SA header */
if ((newsah = key_newsah(&saidx)) == NULL) {
ipseclog((LOG_DEBUG, "key_add: No more memory.\n"));
return key_senderror(so, m, ENOBUFS);
}
}
/* set spidx if there */
/* XXX rewrite */
error = key_setident(newsah, m, mhp);
if (error) {
return key_senderror(so, m, error);
}
/* create new SA entry. */
/* We can create new SA only if SPI is differenct. */
if (key_getsavbyspi(newsah, sa0->sadb_sa_spi)) {
ipseclog((LOG_DEBUG, "key_add: SA already exists.\n"));
return key_senderror(so, m, EEXIST);
}
newsav = key_newsav(m, mhp, newsah, &error);
if (newsav == NULL) {
return key_senderror(so, m, error);
}
/* check SA values to be mature. */
if ((error = key_mature(newsav)) != 0) {
key_freesav(newsav);
return key_senderror(so, m, error);
}
/*
* don't call key_freesav() here, as we would like to keep the SA
* in the database on success.
*/
{
struct mbuf *n;
/* set msg buf from mhp */
n = key_getmsgbuf_x1(m, mhp);
if (n == NULL) {
ipseclog((LOG_DEBUG, "key_update: No more memory.\n"));
return key_senderror(so, m, ENOBUFS);
}
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
}
}
/* m is retained */
static int
key_setident(sah, m, mhp)
struct secashead *sah;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
const struct sadb_ident *idsrc, *iddst;
int idsrclen, iddstlen;
/* sanity check */
if (sah == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_setident: NULL pointer is passed.");
/* don't make buffer if not there */
if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL &&
mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
sah->idents = NULL;
sah->identd = NULL;
return 0;
}
if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL ||
mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
ipseclog((LOG_DEBUG, "key_setident: invalid identity.\n"));
return EINVAL;
}
idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC];
iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST];
idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC];
iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST];
/* validity check */
if (idsrc->sadb_ident_type != iddst->sadb_ident_type) {
ipseclog((LOG_DEBUG, "key_setident: ident type mismatch.\n"));
return EINVAL;
}
switch (idsrc->sadb_ident_type) {
case SADB_IDENTTYPE_PREFIX:
case SADB_IDENTTYPE_FQDN:
case SADB_IDENTTYPE_USERFQDN:
default:
/* XXX do nothing */
sah->idents = NULL;
sah->identd = NULL;
return 0;
}
/* make structure */
KMALLOC(sah->idents, struct sadb_ident *, idsrclen);
if (sah->idents == NULL) {
ipseclog((LOG_DEBUG, "key_setident: No more memory.\n"));
return ENOBUFS;
}
KMALLOC(sah->identd, struct sadb_ident *, iddstlen);
if (sah->identd == NULL) {
KFREE(sah->idents);
sah->idents = NULL;
ipseclog((LOG_DEBUG, "key_setident: No more memory.\n"));
return ENOBUFS;
}
bcopy(idsrc, sah->idents, idsrclen);
bcopy(iddst, sah->identd, iddstlen);
return 0;
}
/*
* m will not be freed on return.
* it is caller's responsibility to free the result.
*/
static struct mbuf *
key_getmsgbuf_x1(m, mhp)
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct mbuf *n;
/* sanity check */
if (m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_getmsgbuf_x1: NULL pointer is passed.");
/* create new sadb_msg to reply. */
n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED,
SADB_EXT_SA, SADB_X_EXT_SA2,
SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST,
SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST);
if (!n)
return NULL;
if (n->m_len < sizeof(struct sadb_msg)) {
n = m_pullup(n, sizeof(struct sadb_msg));
if (n == NULL)
return NULL;
}
mtod(n, struct sadb_msg *)->sadb_msg_errno = 0;
mtod(n, struct sadb_msg *)->sadb_msg_len =
PFKEY_UNIT64(n->m_pkthdr.len);
return n;
}
static int key_delete_all(struct socket *, struct mbuf *,
const struct sadb_msghdr *, u_int16_t);
/*
* SADB_DELETE processing
* receive
* <base, SA(*), address(SD)>
* from the ikmpd, and set SADB_SASTATE_DEAD,
* and send,
* <base, SA(*), address(SD)>
* to the ikmpd.
*
* m will always be freed.
*/
static int
key_delete(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct sadb_sa *sa0;
struct sadb_address *src0, *dst0;
struct secasindex saidx;
struct secashead *sah;
struct secasvar *sav = NULL;
u_int16_t proto;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_delete: NULL pointer is passed.");
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "key_delete: invalid satype is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->ext[SADB_EXT_SA] == NULL) {
/*
* Caller wants us to delete all non-LARVAL SAs
* that match the src/dst. This is used during
* IKE INITIAL-CONTACT.
*/
ipseclog((LOG_DEBUG, "key_delete: doing delete all.\n"));
return key_delete_all(so, m, mhp, proto);
} else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) {
ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
/* XXX boundary check against sa_len */
KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
/* get a SA header */
LIST_FOREACH(sah, &sahtree, chain) {
if (sah->state == SADB_SASTATE_DEAD)
continue;
if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
continue;
/* get a SA with SPI. */
sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
if (sav)
break;
}
if (sah == NULL) {
ipseclog((LOG_DEBUG, "key_delete: no SA found.\n"));
return key_senderror(so, m, ENOENT);
}
key_sa_chgstate(sav, SADB_SASTATE_DEAD);
key_freesav(sav);
sav = NULL;
{
struct mbuf *n;
struct sadb_msg *newmsg;
/* create new sadb_msg to reply. */
n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
if (!n)
return key_senderror(so, m, ENOBUFS);
if (n->m_len < sizeof(struct sadb_msg)) {
n = m_pullup(n, sizeof(struct sadb_msg));
if (n == NULL)
return key_senderror(so, m, ENOBUFS);
}
newmsg = mtod(n, struct sadb_msg *);
newmsg->sadb_msg_errno = 0;
newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
}
}
/*
* delete all SAs for src/dst. Called from key_delete().
*/
static int
key_delete_all(so, m, mhp, proto)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
u_int16_t proto;
{
struct sadb_address *src0, *dst0;
struct secasindex saidx;
struct secashead *sah;
struct secasvar *sav, *nextsav;
u_int stateidx, state;
src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
/* XXX boundary check against sa_len */
KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
LIST_FOREACH(sah, &sahtree, chain) {
if (sah->state == SADB_SASTATE_DEAD)
continue;
if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
continue;
/* Delete all non-LARVAL SAs. */
for (stateidx = 0;
stateidx < _ARRAYLEN(saorder_state_alive);
stateidx++) {
state = saorder_state_alive[stateidx];
if (state == SADB_SASTATE_LARVAL)
continue;
for (sav = LIST_FIRST(&sah->savtree[state]);
sav != NULL; sav = nextsav) {
nextsav = LIST_NEXT(sav, chain);
/* sanity check */
if (sav->state != state) {
ipseclog((LOG_DEBUG, "key_delete_all: "
"invalid sav->state "
"(queue: %u SA: %u)\n",
state, sav->state));
continue;
}
key_sa_chgstate(sav, SADB_SASTATE_DEAD);
key_freesav(sav);
}
}
}
{
struct mbuf *n;
struct sadb_msg *newmsg;
/* create new sadb_msg to reply. */
n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED,
SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
if (!n)
return key_senderror(so, m, ENOBUFS);
if (n->m_len < sizeof(struct sadb_msg)) {
n = m_pullup(n, sizeof(struct sadb_msg));
if (n == NULL)
return key_senderror(so, m, ENOBUFS);
}
newmsg = mtod(n, struct sadb_msg *);
newmsg->sadb_msg_errno = 0;
newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
}
}
/*
* SADB_GET processing
* receive
* <base, SA(*), address(SD)>
* from the ikmpd, and get a SP and a SA to respond,
* and send,
* <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE),
* (identity(SD),) (sensitivity)>
* to the ikmpd.
*
* m will always be freed.
*/
static int
key_get(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct sadb_sa *sa0;
struct sadb_address *src0, *dst0;
struct secasindex saidx;
struct secashead *sah;
struct secasvar *sav = NULL;
u_int16_t proto;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_get: NULL pointer is passed.");
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "key_get: invalid satype is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->ext[SADB_EXT_SA] == NULL ||
mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
/* XXX boundary check against sa_len */
KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
/* get a SA header */
LIST_FOREACH(sah, &sahtree, chain) {
if (sah->state == SADB_SASTATE_DEAD)
continue;
if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
continue;
/* get a SA with SPI. */
sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
if (sav)
break;
}
if (sah == NULL) {
ipseclog((LOG_DEBUG, "key_get: no SA found.\n"));
return key_senderror(so, m, ENOENT);
}
{
struct mbuf *n;
u_int8_t satype;
/* map proto to satype */
if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
ipseclog((LOG_DEBUG, "key_get: there was invalid proto in SAD.\n"));
return key_senderror(so, m, EINVAL);
}
/* create new sadb_msg to reply. */
n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq,
mhp->msg->sadb_msg_pid);
if (!n)
return key_senderror(so, m, ENOBUFS);
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
}
}
/* XXX make it sysctl-configurable? */
static void
key_getcomb_setlifetime(comb)
struct sadb_comb *comb;
{
comb->sadb_comb_soft_allocations = 1;
comb->sadb_comb_hard_allocations = 1;
comb->sadb_comb_soft_bytes = 0;
comb->sadb_comb_hard_bytes = 0;
comb->sadb_comb_hard_addtime = 86400; /* 1 day */
comb->sadb_comb_soft_addtime = comb->sadb_comb_hard_addtime * 80 / 100;
comb->sadb_comb_hard_usetime = 28800; /* 8 hours */
comb->sadb_comb_soft_usetime = comb->sadb_comb_hard_usetime * 80 / 100;
}
#ifdef IPSEC_ESP
/*
* XXX reorder combinations by preference
* XXX no idea if the user wants ESP authentication or not
*/
static struct mbuf *
key_getcomb_esp()
{
struct sadb_comb *comb;
const struct esp_algorithm *algo;
struct mbuf *result = NULL, *m, *n;
int encmin;
int i, off, o;
int totlen;
const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
m = NULL;
for (i = 1; i <= SADB_EALG_MAX; i++) {
algo = esp_algorithm_lookup(i);
if (!algo)
continue;
if (algo->keymax < ipsec_esp_keymin)
continue;
if (algo->keymin < ipsec_esp_keymin)
encmin = ipsec_esp_keymin;
else
encmin = algo->keymin;
if (ipsec_esp_auth)
m = key_getcomb_ah();
else {
#ifdef DIAGNOSTIC
if (l > MLEN)
panic("assumption failed in key_getcomb_esp");
#endif
MGET(m, M_DONTWAIT, MT_DATA);
if (m) {
M_ALIGN(m, l);
m->m_len = l;
m->m_next = NULL;
bzero(mtod(m, caddr_t), m->m_len);
}
}
if (!m)
goto fail;
totlen = 0;
for (n = m; n; n = n->m_next)
totlen += n->m_len;
#ifdef DIAGNOSTIC
if (totlen % l)
panic("assumption failed in key_getcomb_esp");
#endif
for (off = 0; off < totlen; off += l) {
n = m_pulldown(m, off, l, &o);
if (!n) {
/* m is already freed */
goto fail;
}
comb = (struct sadb_comb *)(mtod(n, caddr_t) + o);
bzero(comb, sizeof(*comb));
key_getcomb_setlifetime(comb);
comb->sadb_comb_encrypt = i;
comb->sadb_comb_encrypt_minbits = encmin;
comb->sadb_comb_encrypt_maxbits = algo->keymax;
}
if (!result)
result = m;
else
m_cat(result, m);
}
return result;
fail:
if (result)
m_freem(result);
return NULL;
}
#endif
/*
* XXX reorder combinations by preference
*/
static struct mbuf *
key_getcomb_ah()
{
struct sadb_comb *comb;
const struct ah_algorithm *algo;
struct mbuf *m;
int min;
int i;
const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
m = NULL;
for (i = 1; i <= SADB_AALG_MAX; i++) {
#if 1
/* we prefer HMAC algorithms, not old algorithms */
if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC)
continue;
#endif
algo = ah_algorithm_lookup(i);
if (!algo)
continue;
if (algo->keymax < ipsec_ah_keymin)
continue;
if (algo->keymin < ipsec_ah_keymin)
min = ipsec_ah_keymin;
else
min = algo->keymin;
if (!m) {
#ifdef DIAGNOSTIC
if (l > MLEN)
panic("assumption failed in key_getcomb_ah");
#endif
MGET(m, M_DONTWAIT, MT_DATA);
if (m) {
M_ALIGN(m, l);
m->m_len = l;
m->m_next = NULL;
}
} else
M_PREPEND(m, l, M_DONTWAIT);
if (!m)
return NULL;
comb = mtod(m, struct sadb_comb *);
bzero(comb, sizeof(*comb));
key_getcomb_setlifetime(comb);
comb->sadb_comb_auth = i;
comb->sadb_comb_auth_minbits = min;
comb->sadb_comb_auth_maxbits = algo->keymax;
}
return m;
}
/*
* not really an official behavior. discussed in pf_key@inner.net in Sep2000.
* XXX reorder combinations by preference
*/
static struct mbuf *
key_getcomb_ipcomp()
{
struct sadb_comb *comb;
const struct ipcomp_algorithm *algo;
struct mbuf *m;
int i;
const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
m = NULL;
for (i = 1; i <= SADB_X_CALG_MAX; i++) {
algo = ipcomp_algorithm_lookup(i);
if (!algo)
continue;
if (!m) {
#ifdef DIAGNOSTIC
if (l > MLEN)
panic("assumption failed in key_getcomb_ipcomp");
#endif
MGET(m, M_DONTWAIT, MT_DATA);
if (m) {
M_ALIGN(m, l);
m->m_len = l;
m->m_next = NULL;
}
} else
M_PREPEND(m, l, M_DONTWAIT);
if (!m)
return NULL;
comb = mtod(m, struct sadb_comb *);
bzero(comb, sizeof(*comb));
key_getcomb_setlifetime(comb);
comb->sadb_comb_encrypt = i;
/* what should we set into sadb_comb_*_{min,max}bits? */
}
return m;
}
/*
* XXX no way to pass mode (transport/tunnel) to userland
* XXX replay checking?
* XXX sysctl interface to ipsec_{ah,esp}_keymin
*/
static struct mbuf *
key_getprop(saidx)
const struct secasindex *saidx;
{
struct sadb_prop *prop;
struct mbuf *m, *n;
const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop));
int totlen;
switch (saidx->proto) {
#ifdef IPSEC_ESP
case IPPROTO_ESP:
m = key_getcomb_esp();
break;
#endif
case IPPROTO_AH:
m = key_getcomb_ah();
break;
case IPPROTO_IPCOMP:
m = key_getcomb_ipcomp();
break;
default:
return NULL;
}
if (!m)
return NULL;
M_PREPEND(m, l, M_DONTWAIT);
if (!m)
return NULL;
totlen = 0;
for (n = m; n; n = n->m_next)
totlen += n->m_len;
prop = mtod(m, struct sadb_prop *);
bzero(prop, sizeof(*prop));
prop->sadb_prop_len = PFKEY_UNIT64(totlen);
prop->sadb_prop_exttype = SADB_EXT_PROPOSAL;
prop->sadb_prop_replay = 32; /* XXX */
return m;
}
/*
* SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2().
* send
* <base, SA, address(SD), (address(P)), x_policy,
* (identity(SD),) (sensitivity,) proposal>
* to KMD, and expect to receive
* <base> with SADB_ACQUIRE if error occured,
* or
* <base, src address, dst address, (SPI range)> with SADB_GETSPI
* from KMD by PF_KEY.
*
* XXX x_policy is outside of RFC2367 (KAME extension).
* XXX sensitivity is not supported.
* XXX for ipcomp, RFC2367 does not define how to fill in proposal.
* see comment for key_getcomb_ipcomp().
*
* OUT:
* 0 : succeed
* others: error number
*/
static int
key_acquire(saidx, sp)
struct secasindex *saidx;
struct secpolicy *sp;
{
struct mbuf *result = NULL, *m;
#ifndef IPSEC_NONBLOCK_ACQUIRE
struct secacq *newacq;
#endif
u_int8_t satype;
int error = -1;
u_int32_t seq;
/* sanity check */
if (saidx == NULL)
panic("key_acquire: NULL pointer is passed.");
if ((satype = key_proto2satype(saidx->proto)) == 0)
panic("key_acquire: invalid proto is passed.");
#ifndef IPSEC_NONBLOCK_ACQUIRE
/*
* We never do anything about acquirng SA. There is anather
* solution that kernel blocks to send SADB_ACQUIRE message until
* getting something message from IKEd. In later case, to be
* managed with ACQUIRING list.
*/
/* get an entry to check whether sending message or not. */
if ((newacq = key_getacq(saidx)) != NULL) {
if (key_blockacq_count < newacq->count) {
/* reset counter and do send message. */
newacq->count = 0;
} else {
/* increment counter and do nothing. */
newacq->count++;
return 0;
}
} else {
/* make new entry for blocking to send SADB_ACQUIRE. */
if ((newacq = key_newacq(saidx)) == NULL)
return ENOBUFS;
/* add to acqtree */
LIST_INSERT_HEAD(&acqtree, newacq, chain);
}
#endif
#ifndef IPSEC_NONBLOCK_ACQUIRE
seq = newacq->seq;
#else
seq = (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq));
#endif
m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0);
if (!m) {
error = ENOBUFS;
goto fail;
}
result = m;
/* set sadb_address for saidx's. */
m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
(struct sockaddr *)&saidx->src, FULLMASK, IPSEC_ULPROTO_ANY);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
(struct sockaddr *)&saidx->dst, FULLMASK, IPSEC_ULPROTO_ANY);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
/* XXX proxy address (optional) */
/* set sadb_x_policy */
if (sp) {
m = key_setsadbxpolicy(sp->policy, sp->dir, sp->id);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
}
/* XXX identity (optional) */
#if 0
if (idexttype && fqdn) {
/* create identity extension (FQDN) */
struct sadb_ident *id;
int fqdnlen;
fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */
id = (struct sadb_ident *)p;
bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
id->sadb_ident_exttype = idexttype;
id->sadb_ident_type = SADB_IDENTTYPE_FQDN;
bcopy(fqdn, id + 1, fqdnlen);
p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen);
}
if (idexttype) {
/* create identity extension (USERFQDN) */
struct sadb_ident *id;
int userfqdnlen;
if (userfqdn) {
/* +1 for terminating-NUL */
userfqdnlen = strlen(userfqdn) + 1;
} else
userfqdnlen = 0;
id = (struct sadb_ident *)p;
bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
id->sadb_ident_exttype = idexttype;
id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN;
/* XXX is it correct? */
if (curproc && curproc->p_cred)
id->sadb_ident_id = curproc->p_cred->p_ruid;
if (userfqdn && userfqdnlen)
bcopy(userfqdn, id + 1, userfqdnlen);
p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen);
}
#endif
/* XXX sensitivity (optional) */
/* create proposal/combination extension */
m = key_getprop(saidx);
#if 0
/*
* spec conformant: always attach proposal/combination extension,
* the problem is that we have no way to attach it for ipcomp,
* due to the way sadb_comb is declared in RFC2367.
*/
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
#else
/*
* outside of spec; make proposal/combination extension optional.
*/
if (m)
m_cat(result, m);
#endif
if ((result->m_flags & M_PKTHDR) == 0) {
error = EINVAL;
goto fail;
}
if (result->m_len < sizeof(struct sadb_msg)) {
result = m_pullup(result, sizeof(struct sadb_msg));
if (result == NULL) {
error = ENOBUFS;
goto fail;
}
}
result->m_pkthdr.len = 0;
for (m = result; m; m = m->m_next)
result->m_pkthdr.len += m->m_len;
mtod(result, struct sadb_msg *)->sadb_msg_len =
PFKEY_UNIT64(result->m_pkthdr.len);
return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
fail:
if (result)
m_freem(result);
return error;
}
#ifndef IPSEC_NONBLOCK_ACQUIRE
static struct secacq *
key_newacq(saidx)
struct secasindex *saidx;
{
struct secacq *newacq;
/* get new entry */
KMALLOC(newacq, struct secacq *, sizeof(struct secacq));
if (newacq == NULL) {
ipseclog((LOG_DEBUG, "key_newacq: No more memory.\n"));
return NULL;
}
bzero(newacq, sizeof(*newacq));
/* copy secindex */
bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx));
newacq->seq = (acq_seq == ~0 ? 1 : ++acq_seq);
newacq->created = time_second;
newacq->count = 0;
return newacq;
}
static struct secacq *
key_getacq(saidx)
struct secasindex *saidx;
{
struct secacq *acq;
LIST_FOREACH(acq, &acqtree, chain) {
if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY))
return acq;
}
return NULL;
}
static struct secacq *
key_getacqbyseq(seq)
u_int32_t seq;
{
struct secacq *acq;
LIST_FOREACH(acq, &acqtree, chain) {
if (acq->seq == seq)
return acq;
}
return NULL;
}
#endif
static struct secspacq *
key_newspacq(spidx)
struct secpolicyindex *spidx;
{
struct secspacq *acq;
if (!spidx)
return NULL;
/* get new entry */
KMALLOC(acq, struct secspacq *, sizeof(struct secspacq));
if (acq == NULL) {
ipseclog((LOG_DEBUG, "key_newspacq: No more memory.\n"));
return NULL;
}
bzero(acq, sizeof(*acq));
/* copy secindex */
bcopy(spidx, &acq->spidx, sizeof(acq->spidx));
acq->created = time_second;
acq->count = 1;
return acq;
}
static struct secspacq *
key_getspacq(spidx)
struct secpolicyindex *spidx;
{
struct secspacq *acq;
if (!spidx)
return NULL;
LIST_FOREACH(acq, &spacqtree, chain) {
if (key_cmpspidx_exactly(spidx, &acq->spidx))
return acq;
}
return NULL;
}
/*
* SADB_ACQUIRE processing,
* in first situation, is receiving
* <base>
* from the ikmpd, and clear sequence of its secasvar entry.
*
* In second situation, is receiving
* <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
* from a user land process, and return
* <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
* to the socket.
*
* m will always be freed.
*/
static int
key_acquire2(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct sadb_address *src0, *dst0;
struct secasindex saidx;
struct secashead *sah;
u_int16_t proto;
int error;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_acquire2: NULL pointer is passed.");
/*
* Error message from KMd.
* We assume that if error was occured in IKEd, the length of PFKEY
* message is equal to the size of sadb_msg structure.
* We do not raise error even if error occured in this function.
*/
if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) {
#ifndef IPSEC_NONBLOCK_ACQUIRE
struct secacq *acq;
/* check sequence number */
if (mhp->msg->sadb_msg_seq == 0) {
ipseclog((LOG_DEBUG, "key_acquire2: must specify sequence number.\n"));
m_freem(m);
return 0;
}
if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) {
/*
* the specified larval SA is already gone, or we got
* a bogus sequence number. we can silently ignore it.
*/
m_freem(m);
return 0;
}
/* reset acq counter in order to deletion by timehander. */
acq->created = time_second;
acq->count = 0;
#endif
m_freem(m);
return 0;
}
/*
* This message is from user land.
*/
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "key_acquire2: invalid satype is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
mhp->ext[SADB_EXT_PROPOSAL] == NULL) {
/* error */
ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) {
/* error */
ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n"));
return key_senderror(so, m, EINVAL);
}
src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
/* XXX boundary check against sa_len */
KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
/* get a SA index */
LIST_FOREACH(sah, &sahtree, chain) {
if (sah->state == SADB_SASTATE_DEAD)
continue;
if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID))
break;
}
if (sah != NULL) {
ipseclog((LOG_DEBUG, "key_acquire2: a SA exists already.\n"));
return key_senderror(so, m, EEXIST);
}
error = key_acquire(&saidx, NULL);
if (error != 0) {
ipseclog((LOG_DEBUG, "key_acquire2: error %d returned "
"from key_acquire.\n", mhp->msg->sadb_msg_errno));
return key_senderror(so, m, error);
}
return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED);
}
/*
* SADB_REGISTER processing.
* If SATYPE_UNSPEC has been passed as satype, only return sabd_supported.
* receive
* <base>
* from the ikmpd, and register a socket to send PF_KEY messages,
* and send
* <base, supported>
* to KMD by PF_KEY.
* If socket is detached, must free from regnode.
*
* m will always be freed.
*/
static int
key_register(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct secreg *reg, *newreg = 0;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_register: NULL pointer is passed.");
/* check for invalid register message */
if (mhp->msg->sadb_msg_satype >= sizeof(regtree)/sizeof(regtree[0]))
return key_senderror(so, m, EINVAL);
/* When SATYPE_UNSPEC is specified, only return sabd_supported. */
if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC)
goto setmsg;
/* check whether existing or not */
LIST_FOREACH(reg, &regtree[mhp->msg->sadb_msg_satype], chain) {
if (reg->so == so) {
ipseclog((LOG_DEBUG, "key_register: socket exists already.\n"));
return key_senderror(so, m, EEXIST);
}
}
/* create regnode */
KMALLOC(newreg, struct secreg *, sizeof(*newreg));
if (newreg == NULL) {
ipseclog((LOG_DEBUG, "key_register: No more memory.\n"));
return key_senderror(so, m, ENOBUFS);
}
bzero((caddr_t)newreg, sizeof(*newreg));
newreg->so = so;
((struct keycb *)sotorawcb(so))->kp_registered++;
/* add regnode to regtree. */
LIST_INSERT_HEAD(&regtree[mhp->msg->sadb_msg_satype], newreg, chain);
setmsg:
{
struct mbuf *n;
struct sadb_msg *newmsg;
struct sadb_supported *sup;
u_int len, alen, elen;
int off;
int i;
struct sadb_alg *alg;
/* create new sadb_msg to reply. */
alen = 0;
for (i = 1; i <= SADB_AALG_MAX; i++) {
if (ah_algorithm_lookup(i))
alen += sizeof(struct sadb_alg);
}
if (alen)
alen += sizeof(struct sadb_supported);
elen = 0;
#ifdef IPSEC_ESP
for (i = 1; i <= SADB_EALG_MAX; i++) {
if (esp_algorithm_lookup(i))
elen += sizeof(struct sadb_alg);
}
if (elen)
elen += sizeof(struct sadb_supported);
#endif
len = sizeof(struct sadb_msg) + alen + elen;
if (len > MCLBYTES)
return key_senderror(so, m, ENOBUFS);
MGETHDR(n, M_DONTWAIT, MT_DATA);
if (len > MHLEN) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_freem(n);
n = NULL;
}
}
if (!n)
return key_senderror(so, m, ENOBUFS);
n->m_pkthdr.len = n->m_len = len;
n->m_next = NULL;
off = 0;
m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
newmsg = mtod(n, struct sadb_msg *);
newmsg->sadb_msg_errno = 0;
newmsg->sadb_msg_len = PFKEY_UNIT64(len);
off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
/* for authentication algorithm */
if (alen) {
sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
sup->sadb_supported_len = PFKEY_UNIT64(alen);
sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
off += PFKEY_ALIGN8(sizeof(*sup));
for (i = 1; i <= SADB_AALG_MAX; i++) {
const struct ah_algorithm *aalgo;
aalgo = ah_algorithm_lookup(i);
if (!aalgo)
continue;
alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
alg->sadb_alg_id = i;
alg->sadb_alg_ivlen = 0;
alg->sadb_alg_minbits = aalgo->keymin;
alg->sadb_alg_maxbits = aalgo->keymax;
off += PFKEY_ALIGN8(sizeof(*alg));
}
}
#ifdef IPSEC_ESP
/* for encryption algorithm */
if (elen) {
sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
sup->sadb_supported_len = PFKEY_UNIT64(elen);
sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
off += PFKEY_ALIGN8(sizeof(*sup));
for (i = 1; i <= SADB_EALG_MAX; i++) {
const struct esp_algorithm *ealgo;
ealgo = esp_algorithm_lookup(i);
if (!ealgo)
continue;
alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
alg->sadb_alg_id = i;
if (ealgo && ealgo->ivlen) {
/*
* give NULL to get the value preferred by
* algorithm XXX SADB_X_EXT_DERIV ?
*/
alg->sadb_alg_ivlen =
(*ealgo->ivlen)(ealgo, NULL);
} else
alg->sadb_alg_ivlen = 0;
alg->sadb_alg_minbits = ealgo->keymin;
alg->sadb_alg_maxbits = ealgo->keymax;
off += PFKEY_ALIGN8(sizeof(struct sadb_alg));
}
}
#endif
#ifdef DIGAGNOSTIC
if (off != len)
panic("length assumption failed in key_register");
#endif
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED);
}
}
/*
* free secreg entry registered.
* XXX: I want to do free a socket marked done SADB_RESIGER to socket.
*/
void
key_freereg(so)
struct socket *so;
{
struct secreg *reg;
int i;
/* sanity check */
if (so == NULL)
panic("key_freereg: NULL pointer is passed.");
/*
* check whether existing or not.
* check all type of SA, because there is a potential that
* one socket is registered to multiple type of SA.
*/
for (i = 0; i <= SADB_SATYPE_MAX; i++) {
LIST_FOREACH(reg, &regtree[i], chain) {
if (reg->so == so && __LIST_CHAINED(reg)) {
LIST_REMOVE(reg, chain);
KFREE(reg);
break;
}
}
}
return;
}
/*
* SADB_EXPIRE processing
* send
* <base, SA, SA2, lifetime(C and one of HS), address(SD)>
* to KMD by PF_KEY.
* NOTE: We send only soft lifetime extension.
*
* OUT: 0 : succeed
* others : error number
*/
static int
key_expire(sav)
struct secasvar *sav;
{
int s;
int satype;
struct mbuf *result = NULL, *m;
int len;
int error = -1;
struct sadb_lifetime *lt;
/* XXX: Why do we lock ? */
s = splnet(); /*called from softclock()*/
/* sanity check */
if (sav == NULL)
panic("key_expire: NULL pointer is passed.");
if (sav->sah == NULL)
panic("key_expire: Why was SA index in SA NULL.");
if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0)
panic("key_expire: invalid proto is passed.");
/* set msg header */
m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt);
if (!m) {
error = ENOBUFS;
goto fail;
}
result = m;
/* create SA extension */
m = key_setsadbsa(sav);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
/* create SA extension */
m = key_setsadbxsa2(sav->sah->saidx.mode,
sav->replay ? (sav->replay->count & 0xffffffff) : 0,
sav->sah->saidx.reqid);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
/* create lifetime extension (current and soft) */
len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
m = key_alloc_mbuf(len);
if (!m || m->m_next) { /*XXX*/
if (m)
m_freem(m);
error = ENOBUFS;
goto fail;
}
bzero(mtod(m, caddr_t), len);
lt = mtod(m, struct sadb_lifetime *);
lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
lt->sadb_lifetime_allocations = sav->lft_c->sadb_lifetime_allocations;
lt->sadb_lifetime_bytes = sav->lft_c->sadb_lifetime_bytes;
lt->sadb_lifetime_addtime = sav->lft_c->sadb_lifetime_addtime;
lt->sadb_lifetime_usetime = sav->lft_c->sadb_lifetime_usetime;
lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
bcopy(sav->lft_s, lt, sizeof(*lt));
m_cat(result, m);
/* set sadb_address for source */
m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
(struct sockaddr *)&sav->sah->saidx.src,
FULLMASK, IPSEC_ULPROTO_ANY);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
/* set sadb_address for destination */
m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
(struct sockaddr *)&sav->sah->saidx.dst,
FULLMASK, IPSEC_ULPROTO_ANY);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
if ((result->m_flags & M_PKTHDR) == 0) {
error = EINVAL;
goto fail;
}
if (result->m_len < sizeof(struct sadb_msg)) {
result = m_pullup(result, sizeof(struct sadb_msg));
if (result == NULL) {
error = ENOBUFS;
goto fail;
}
}
result->m_pkthdr.len = 0;
for (m = result; m; m = m->m_next)
result->m_pkthdr.len += m->m_len;
mtod(result, struct sadb_msg *)->sadb_msg_len =
PFKEY_UNIT64(result->m_pkthdr.len);
splx(s);
return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
fail:
if (result)
m_freem(result);
splx(s);
return error;
}
/*
* SADB_FLUSH processing
* receive
* <base>
* from the ikmpd, and free all entries in secastree.
* and send,
* <base>
* to the ikmpd.
* NOTE: to do is only marking SADB_SASTATE_DEAD.
*
* m will always be freed.
*/
static int
key_flush(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct sadb_msg *newmsg;
struct secashead *sah, *nextsah;
struct secasvar *sav, *nextsav;
u_int16_t proto;
u_int8_t state;
u_int stateidx;
/* sanity check */
if (so == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_flush: NULL pointer is passed.");
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "key_flush: invalid satype is passed.\n"));
return key_senderror(so, m, EINVAL);
}
/* no SATYPE specified, i.e. flushing all SA. */
for (sah = LIST_FIRST(&sahtree); sah != NULL; sah = nextsah) {
nextsah = LIST_NEXT(sah, chain);
if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
proto != sah->saidx.proto)
continue;
for (stateidx = 0;
stateidx < _ARRAYLEN(saorder_state_alive);
stateidx++) {
state = saorder_state_any[stateidx];
for (sav = LIST_FIRST(&sah->savtree[state]);
sav != NULL;
sav = nextsav) {
nextsav = LIST_NEXT(sav, chain);
key_sa_chgstate(sav, SADB_SASTATE_DEAD);
key_freesav(sav);
}
}
sah->state = SADB_SASTATE_DEAD;
}
if (m->m_len < sizeof(struct sadb_msg) ||
sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
ipseclog((LOG_DEBUG, "key_flush: No more memory.\n"));
return key_senderror(so, m, ENOBUFS);
}
if (m->m_next)
m_freem(m->m_next);
m->m_next = NULL;
m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg);
newmsg = mtod(m, struct sadb_msg *);
newmsg->sadb_msg_errno = 0;
newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
}
/*
* SADB_DUMP processing
* dump all entries including status of DEAD in SAD.
* receive
* <base>
* from the ikmpd, and dump all secasvar leaves
* and send,
* <base> .....
* to the ikmpd.
*
* m will always be freed.
*/
static int
key_dump(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
struct secashead *sah;
struct secasvar *sav;
u_int16_t proto;
u_int stateidx;
u_int8_t satype;
u_int8_t state;
int cnt;
struct mbuf *n;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_dump: NULL pointer is passed.");
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "key_dump: invalid satype is passed.\n"));
return key_senderror(so, m, EINVAL);
}
/* count sav entries to be sent to the userland. */
cnt = 0;
LIST_FOREACH(sah, &sahtree, chain) {
if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
proto != sah->saidx.proto)
continue;
for (stateidx = 0;
stateidx < _ARRAYLEN(saorder_state_any);
stateidx++) {
state = saorder_state_any[stateidx];
LIST_FOREACH(sav, &sah->savtree[state], chain) {
cnt++;
}
}
}
if (cnt == 0)
return key_senderror(so, m, ENOENT);
/* send this to the userland, one at a time. */
LIST_FOREACH(sah, &sahtree, chain) {
if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
proto != sah->saidx.proto)
continue;
/* map proto to satype */
if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
ipseclog((LOG_DEBUG, "key_dump: there was invalid proto in SAD.\n"));
return key_senderror(so, m, EINVAL);
}
for (stateidx = 0;
stateidx < _ARRAYLEN(saorder_state_any);
stateidx++) {
state = saorder_state_any[stateidx];
LIST_FOREACH(sav, &sah->savtree[state], chain) {
n = key_setdumpsa(sav, SADB_DUMP, satype,
--cnt, mhp->msg->sadb_msg_pid);
if (!n)
return key_senderror(so, m, ENOBUFS);
key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
}
}
}
m_freem(m);
return 0;
}
/*
* SADB_X_PROMISC processing
*
* m will always be freed.
*/
static int
key_promisc(so, m, mhp)
struct socket *so;
struct mbuf *m;
const struct sadb_msghdr *mhp;
{
int olen;
/* sanity check */
if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
panic("key_promisc: NULL pointer is passed.");
olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
if (olen < sizeof(struct sadb_msg)) {
#if 1
return key_senderror(so, m, EINVAL);
#else
m_freem(m);
return 0;
#endif
} else if (olen == sizeof(struct sadb_msg)) {
/* enable/disable promisc mode */
struct keycb *kp;
if ((kp = (struct keycb *)sotorawcb(so)) == NULL)
return key_senderror(so, m, EINVAL);
mhp->msg->sadb_msg_errno = 0;
switch (mhp->msg->sadb_msg_satype) {
case 0:
case 1:
kp->kp_promisc = mhp->msg->sadb_msg_satype;
break;
default:
return key_senderror(so, m, EINVAL);
}
/* send the original message back to everyone */
mhp->msg->sadb_msg_errno = 0;
return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
} else {
/* send packet as is */
m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg)));
/* TODO: if sadb_msg_seq is specified, send to specific pid */
return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
}
}
static int (*key_typesw[])(struct socket *, struct mbuf *,
const struct sadb_msghdr *) = {
NULL, /* SADB_RESERVED */
key_getspi, /* SADB_GETSPI */
key_update, /* SADB_UPDATE */
key_add, /* SADB_ADD */
key_delete, /* SADB_DELETE */
key_get, /* SADB_GET */
key_acquire2, /* SADB_ACQUIRE */
key_register, /* SADB_REGISTER */
NULL, /* SADB_EXPIRE */
key_flush, /* SADB_FLUSH */
key_dump, /* SADB_DUMP */
key_promisc, /* SADB_X_PROMISC */
NULL, /* SADB_X_PCHANGE */
key_spdadd, /* SADB_X_SPDUPDATE */
key_spdadd, /* SADB_X_SPDADD */
key_spddelete, /* SADB_X_SPDDELETE */
key_spdget, /* SADB_X_SPDGET */
NULL, /* SADB_X_SPDACQUIRE */
key_spddump, /* SADB_X_SPDDUMP */
key_spdflush, /* SADB_X_SPDFLUSH */
key_spdadd, /* SADB_X_SPDSETIDX */
NULL, /* SADB_X_SPDEXPIRE */
key_spddelete2, /* SADB_X_SPDDELETE2 */
};
/*
* parse sadb_msg buffer to process PFKEYv2,
* and create a data to response if needed.
* I think to be dealed with mbuf directly.
* IN:
* msgp : pointer to pointer to a received buffer pulluped.
* This is rewrited to response.
* so : pointer to socket.
* OUT:
* length for buffer to send to user process.
*/
int
key_parse(m, so)
struct mbuf *m;
struct socket *so;
{
struct sadb_msg *msg;
struct sadb_msghdr mh;
u_int orglen;
int error;
int target;
#ifdef INET6
struct sockaddr_in6 *sin6;
#endif
/* sanity check */
if (m == NULL || so == NULL)
panic("key_parse: NULL pointer is passed.");
#if 0 /*kdebug_sadb assumes msg in linear buffer*/
KEYDEBUG(KEYDEBUG_KEY_DUMP,
ipseclog((LOG_DEBUG, "key_parse: passed sadb_msg\n"));
kdebug_sadb(msg));
#endif
if (m->m_len < sizeof(struct sadb_msg)) {
m = m_pullup(m, sizeof(struct sadb_msg));
if (!m)
return ENOBUFS;
}
msg = mtod(m, struct sadb_msg *);
orglen = PFKEY_UNUNIT64(msg->sadb_msg_len);
target = KEY_SENDUP_ONE;
if ((m->m_flags & M_PKTHDR) == 0 ||
m->m_pkthdr.len != m->m_pkthdr.len) {
ipseclog((LOG_DEBUG, "key_parse: invalid message length.\n"));
pfkeystat.out_invlen++;
error = EINVAL;
goto senderror;
}
if (msg->sadb_msg_version != PF_KEY_V2) {
ipseclog((LOG_DEBUG,
"key_parse: PF_KEY version %u is mismatched.\n",
msg->sadb_msg_version));
pfkeystat.out_invver++;
error = EINVAL;
goto senderror;
}
if (msg->sadb_msg_type > SADB_MAX) {
ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n",
msg->sadb_msg_type));
pfkeystat.out_invmsgtype++;
error = EINVAL;
goto senderror;
}
/* for old-fashioned code - should be nuked */
if (m->m_pkthdr.len > MCLBYTES) {
m_freem(m);
return ENOBUFS;
}
if (m->m_next) {
struct mbuf *n;
MGETHDR(n, M_DONTWAIT, MT_DATA);
if (n && m->m_pkthdr.len > MHLEN) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_free(n);
n = NULL;
}
}
if (!n) {
m_freem(m);
return ENOBUFS;
}
m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
n->m_pkthdr.len = n->m_len = m->m_pkthdr.len;
n->m_next = NULL;
m_freem(m);
m = n;
}
/* align the mbuf chain so that extensions are in contiguous region. */
error = key_align(m, &mh);
if (error)
return error;
msg = mh.msg;
/* check SA type */
switch (msg->sadb_msg_satype) {
case SADB_SATYPE_UNSPEC:
switch (msg->sadb_msg_type) {
case SADB_GETSPI:
case SADB_UPDATE:
case SADB_ADD:
case SADB_DELETE:
case SADB_GET:
case SADB_ACQUIRE:
case SADB_EXPIRE:
ipseclog((LOG_DEBUG, "key_parse: must specify satype "
"when msg type=%u.\n", msg->sadb_msg_type));
pfkeystat.out_invsatype++;
error = EINVAL;
goto senderror;
}
break;
case SADB_SATYPE_AH:
case SADB_SATYPE_ESP:
case SADB_X_SATYPE_IPCOMP:
case SADB_X_SATYPE_TCPSIGNATURE:
switch (msg->sadb_msg_type) {
case SADB_X_SPDADD:
case SADB_X_SPDDELETE:
case SADB_X_SPDGET:
case SADB_X_SPDDUMP:
case SADB_X_SPDFLUSH:
case SADB_X_SPDSETIDX:
case SADB_X_SPDUPDATE:
case SADB_X_SPDDELETE2:
ipseclog((LOG_DEBUG, "key_parse: illegal satype=%u\n",
msg->sadb_msg_type));
pfkeystat.out_invsatype++;
error = EINVAL;
goto senderror;
}
break;
case SADB_SATYPE_RSVP:
case SADB_SATYPE_OSPFV2:
case SADB_SATYPE_RIPV2:
case SADB_SATYPE_MIP:
ipseclog((LOG_DEBUG, "key_parse: type %u isn't supported.\n",
msg->sadb_msg_satype));
pfkeystat.out_invsatype++;
error = EOPNOTSUPP;
goto senderror;
case 1: /* XXX: What does it do? */
if (msg->sadb_msg_type == SADB_X_PROMISC)
break;
/*FALLTHROUGH*/
default:
ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n",
msg->sadb_msg_satype));
pfkeystat.out_invsatype++;
error = EINVAL;
goto senderror;
}
/* check field of upper layer protocol and address family */
if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL &&
mh.ext[SADB_EXT_ADDRESS_DST] != NULL) {
struct sadb_address *src0, *dst0;
u_int plen;
src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]);
dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]);
/* check upper layer protocol */
if (src0->sadb_address_proto != dst0->sadb_address_proto) {
ipseclog((LOG_DEBUG, "key_parse: upper layer protocol mismatched.\n"));
pfkeystat.out_invaddr++;
error = EINVAL;
goto senderror;
}
/* check family */
if (PFKEY_ADDR_SADDR(src0)->sa_family !=
PFKEY_ADDR_SADDR(dst0)->sa_family) {
ipseclog((LOG_DEBUG, "key_parse: address family mismatched.\n"));
pfkeystat.out_invaddr++;
error = EINVAL;
goto senderror;
}
if (PFKEY_ADDR_SADDR(src0)->sa_len !=
PFKEY_ADDR_SADDR(dst0)->sa_len) {
ipseclog((LOG_DEBUG,
"key_parse: address struct size mismatched.\n"));
pfkeystat.out_invaddr++;
error = EINVAL;
goto senderror;
}
switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
case AF_INET:
if (PFKEY_ADDR_SADDR(src0)->sa_len !=
sizeof(struct sockaddr_in)) {
pfkeystat.out_invaddr++;
error = EINVAL;
goto senderror;
}
break;
case AF_INET6:
if (PFKEY_ADDR_SADDR(src0)->sa_len !=
sizeof(struct sockaddr_in6)) {
pfkeystat.out_invaddr++;
error = EINVAL;
goto senderror;
}
#ifdef INET6
/*
* Check validity of the scope zone ID of the
* addresses, and embed the zone ID into the address
* if necessary.
*/
sin6 = (struct sockaddr_in6 *)PFKEY_ADDR_SADDR(src0);
if ((error = sa6_embedscope(sin6, 0)) != 0)
goto senderror;
sin6 = (struct sockaddr_in6 *)PFKEY_ADDR_SADDR(dst0);
if ((error = sa6_embedscope(sin6, 0)) != 0)
goto senderror;
#endif
break;
default:
ipseclog((LOG_DEBUG,
"key_parse: unsupported address family.\n"));
pfkeystat.out_invaddr++;
error = EAFNOSUPPORT;
goto senderror;
}
switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
case AF_INET:
plen = sizeof(struct in_addr) << 3;
break;
case AF_INET6:
plen = sizeof(struct in6_addr) << 3;
break;
default:
plen = 0; /*fool gcc*/
break;
}
/* check max prefix length */
if (src0->sadb_address_prefixlen > plen ||
dst0->sadb_address_prefixlen > plen) {
ipseclog((LOG_DEBUG,
"key_parse: illegal prefixlen.\n"));
pfkeystat.out_invaddr++;
error = EINVAL;
goto senderror;
}
/*
* prefixlen == 0 is valid because there can be a case when
* all addresses are matched.
*/
}
if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) ||
key_typesw[msg->sadb_msg_type] == NULL) {
pfkeystat.out_invmsgtype++;
error = EINVAL;
goto senderror;
}
return (*key_typesw[msg->sadb_msg_type])(so, m, &mh);
senderror:
msg->sadb_msg_errno = error;
return key_sendup_mbuf(so, m, target);
}
static int
key_senderror(so, m, code)
struct socket *so;
struct mbuf *m;
int code;
{
struct sadb_msg *msg;
if (m->m_len < sizeof(struct sadb_msg))
panic("invalid mbuf passed to key_senderror");
msg = mtod(m, struct sadb_msg *);
msg->sadb_msg_errno = code;
return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
}
/*
* set the pointer to each header into message buffer.
* m will be freed on error.
* XXX larger-than-MCLBYTES extension?
*/
static int
key_align(m, mhp)
struct mbuf *m;
struct sadb_msghdr *mhp;
{
struct mbuf *n;
struct sadb_ext *ext;
size_t off, end;
int extlen;
int toff;
/* sanity check */
if (m == NULL || mhp == NULL)
panic("key_align: NULL pointer is passed.");
if (m->m_len < sizeof(struct sadb_msg))
panic("invalid mbuf passed to key_align");
/* initialize */
bzero(mhp, sizeof(*mhp));
mhp->msg = mtod(m, struct sadb_msg *);
mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */
end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
extlen = end; /*just in case extlen is not updated*/
for (off = sizeof(struct sadb_msg); off < end; off += extlen) {
n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff);
if (!n) {
/* m is already freed */
return ENOBUFS;
}
ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
/* set pointer */
switch (ext->sadb_ext_type) {
case SADB_EXT_SA:
case SADB_EXT_ADDRESS_SRC:
case SADB_EXT_ADDRESS_DST:
case SADB_EXT_ADDRESS_PROXY:
case SADB_EXT_LIFETIME_CURRENT:
case SADB_EXT_LIFETIME_HARD:
case SADB_EXT_LIFETIME_SOFT:
case SADB_EXT_KEY_AUTH:
case SADB_EXT_KEY_ENCRYPT:
case SADB_EXT_IDENTITY_SRC:
case SADB_EXT_IDENTITY_DST:
case SADB_EXT_SENSITIVITY:
case SADB_EXT_PROPOSAL:
case SADB_EXT_SUPPORTED_AUTH:
case SADB_EXT_SUPPORTED_ENCRYPT:
case SADB_EXT_SPIRANGE:
case SADB_X_EXT_POLICY:
case SADB_X_EXT_SA2:
/* duplicate check */
/*
* XXX Are there duplication payloads of either
* KEY_AUTH or KEY_ENCRYPT ?
*/
if (mhp->ext[ext->sadb_ext_type] != NULL) {
ipseclog((LOG_DEBUG,
"key_align: duplicate ext_type %u "
"is passed.\n", ext->sadb_ext_type));
m_freem(m);
pfkeystat.out_dupext++;
return EINVAL;
}
break;
default:
ipseclog((LOG_DEBUG,
"key_align: invalid ext_type %u is passed.\n",
ext->sadb_ext_type));
m_freem(m);
pfkeystat.out_invexttype++;
return EINVAL;
}
extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
if (key_validate_ext(ext, extlen)) {
m_freem(m);
pfkeystat.out_invlen++;
return EINVAL;
}
n = m_pulldown(m, off, extlen, &toff);
if (!n) {
/* m is already freed */
return ENOBUFS;
}
ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
mhp->ext[ext->sadb_ext_type] = ext;
mhp->extoff[ext->sadb_ext_type] = off;
mhp->extlen[ext->sadb_ext_type] = extlen;
}
if (off != end) {
m_freem(m);
pfkeystat.out_invlen++;
return EINVAL;
}
return 0;
}
static int
key_validate_ext(ext, len)
struct sadb_ext *ext;
int len;
{
struct sockaddr *sa;
enum { NONE, ADDR } checktype = NONE;
int baselen = 0;
const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len);
if (len != PFKEY_UNUNIT64(ext->sadb_ext_len))
return EINVAL;
/* if it does not match minimum/maximum length, bail */
if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) ||
ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0]))
return EINVAL;
if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type])
return EINVAL;
if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type])
return EINVAL;
/* more checks based on sadb_ext_type XXX need more */
switch (ext->sadb_ext_type) {
case SADB_EXT_ADDRESS_SRC:
case SADB_EXT_ADDRESS_DST:
case SADB_EXT_ADDRESS_PROXY:
baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
checktype = ADDR;
break;
case SADB_EXT_IDENTITY_SRC:
case SADB_EXT_IDENTITY_DST:
if (((struct sadb_ident *)ext)->sadb_ident_type ==
SADB_X_IDENTTYPE_ADDR) {
baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident));
checktype = ADDR;
} else
checktype = NONE;
break;
default:
checktype = NONE;
break;
}
switch (checktype) {
case NONE:
break;
case ADDR:
sa = (struct sockaddr *)((caddr_t)ext + baselen);
if (len < baselen + sal)
return EINVAL;
if (baselen + PFKEY_ALIGN8(sa->sa_len) != len)
return EINVAL;
break;
}
return 0;
}
void
key_init()
{
int i;
bzero((caddr_t)&key_cb, sizeof(key_cb));
callout_init(&key_timehandler_ch, 0);
for (i = 0; i < IPSEC_DIR_MAX; i++)
LIST_INIT(&sptree[i]);
LIST_INIT(&sahtree);
for (i = 0; i <= SADB_SATYPE_MAX; i++)
LIST_INIT(&regtree[i]);
for (i = 0; i < SPIHASHSIZE; i++)
LIST_INIT(&spihash[i]);
#ifndef IPSEC_NONBLOCK_ACQUIRE
LIST_INIT(&acqtree);
#endif
LIST_INIT(&spacqtree);
TAILQ_INIT(&satailq);
TAILQ_INIT(&sptailq);
/* system default */
#ifdef INET
ip4_def_policy = key_newsp(0);
if (!ip4_def_policy)
panic("could not initialize IPv4 default security policy");
ip4_def_policy->state = IPSEC_SPSTATE_ALIVE;
ip4_def_policy->policy = IPSEC_POLICY_NONE;
ip4_def_policy->dir = IPSEC_DIR_ANY;
ip4_def_policy->readonly = 1;
ip4_def_policy->persist = 1;
#endif
#ifdef INET6
ip6_def_policy = key_newsp(0);
if (!ip6_def_policy)
panic("could not initialize IPv6 default security policy");
ip6_def_policy->state = IPSEC_SPSTATE_ALIVE;
ip6_def_policy->policy = IPSEC_POLICY_NONE;
ip6_def_policy->dir = IPSEC_DIR_ANY;
ip6_def_policy->readonly = 1;
ip6_def_policy->persist = 1;
#endif
callout_reset(&key_timehandler_ch, hz, key_timehandler, (void *)0);
/* initialize key statistics */
keystat.getspi_count = 1;
printf("IPsec: Initialized Security Association Processing.\n");
return;
}
/*
* XXX: maybe This function is called after INBOUND IPsec processing.
*
* Special check for tunnel-mode packets.
* We must make some checks for consistency between inner and outer IP header.
*
* xxx more checks to be provided
*/
int
key_checktunnelsanity(sav, family, src, dst)
struct secasvar *sav;
u_int family;
caddr_t src;
caddr_t dst;
{
/* sanity check */
if (sav->sah == NULL)
panic("sav->sah == NULL at key_checktunnelsanity");
/* XXX: check inner IP header */
return 1;
}
#if 0
/*
* Get FQDN for the host.
* If the administrator configured hostname (by hostname(1)) without
* domain name, returns nothing.
*/
static const char *
key_getfqdn()
{
int i;
int hasdot;
static char fqdn[MAXHOSTNAMELEN + 1];
int hostnamelen = strlen(hostname);
if (!hostnamelen)
return NULL;
/* check if it comes with domain name. */
hasdot = 0;
for (i = 0; i < hostnamelen; i++) {
if (hostname[i] == '.')
hasdot++;
}
if (!hasdot)
return NULL;
/* NOTE: hostname may not be NUL-terminated. */
bzero(fqdn, sizeof(fqdn));
bcopy(hostname, fqdn, hostnamelen);
fqdn[hostnamelen] = '\0';
return fqdn;
}
/*
* get username@FQDN for the host/user.
*/
static const char *
key_getuserfqdn()
{
const char *host;
static char userfqdn[MAXHOSTNAMELEN + MAXLOGNAME + 2];
struct proc *p = curproc;
char *q;
PROC_LOCK(p);
if (!p || !p->p_pgrp || !p->p_pgrp->pg_session) {
PROC_UNLOCK(p);
return NULL;
}
if (!(host = key_getfqdn())) {
PROC_UNLOCK(p);
return NULL;
}
/* NOTE: s_login may not be-NUL terminated. */
bzero(userfqdn, sizeof(userfqdn));
SESS_LOCK(p->p_session);
bcopy(p->p_pgrp->pg_session->s_login, userfqdn, MAXLOGNAME);
SESS_UNLOCK(p->p_session);
PROC_UNLOCK(p);
userfqdn[MAXLOGNAME] = '\0'; /* safeguard */
q = userfqdn + strlen(userfqdn);
*q++ = '@';
bcopy(host, q, strlen(host));
q += strlen(host);
*q++ = '\0';
return userfqdn;
}
#endif
/* record data transfer on SA, and update timestamps */
void
key_sa_recordxfer(sav, m)
struct secasvar *sav;
struct mbuf *m;
{
if (!sav)
panic("key_sa_recordxfer called with sav == NULL");
if (!m)
panic("key_sa_recordxfer called with m == NULL");
if (!sav->lft_c)
return;
/*
* XXX Currently, there is a difference of bytes size
* between inbound and outbound processing.
*/
sav->lft_c->sadb_lifetime_bytes += m->m_pkthdr.len;
/* to check bytes lifetime is done in key_timehandler(). */
/*
* We use the number of packets as the unit of
* sadb_lifetime_allocations. We increment the variable
* whenever {esp,ah}_{in,out}put is called.
*/
sav->lft_c->sadb_lifetime_allocations++;
/* XXX check for expires? */
/*
* NOTE: We record CURRENT sadb_lifetime_usetime by using wall clock,
* in seconds. HARD and SOFT lifetime are measured by the time
* difference (again in seconds) from sadb_lifetime_usetime.
*
* usetime
* v expire expire
* -----+-----+--------+---> t
* <--------------> HARD
* <-----> SOFT
*/
{
sav->lft_c->sadb_lifetime_usetime = time_second;
/* XXX check for expires? */
}
return;
}
/* dumb version */
void
key_sa_routechange(dst)
struct sockaddr *dst;
{
struct secashead *sah;
struct route *ro;
LIST_FOREACH(sah, &sahtree, chain) {
ro = &sah->sa_route;
if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len &&
bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) {
RTFREE(ro->ro_rt);
ro->ro_rt = (struct rtentry *)NULL;
}
}
return;
}
static void
key_sa_chgstate(sav, state)
struct secasvar *sav;
u_int8_t state;
{
if (sav == NULL)
panic("key_sa_chgstate called with sav == NULL");
if (sav->state == state)
return;
if (__LIST_CHAINED(sav))
LIST_REMOVE(sav, chain);
sav->state = state;
LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain);
}
void
key_sa_stir_iv(sav)
struct secasvar *sav;
{
if (!sav->iv)
panic("key_sa_stir_iv called with sav == NULL");
key_randomfill(sav->iv, sav->ivlen);
}
static void
key_sp_dead(sp)
struct secpolicy *sp;
{
/* mark the SP dead */
sp->state = IPSEC_SPSTATE_DEAD;
}
static void
key_sp_unlink(sp)
struct secpolicy *sp;
{
/* remove from SP index */
if (__LIST_CHAINED(sp)) {
LIST_REMOVE(sp, chain);
key_freesp(sp);
}
}
/* XXX too much? */
static struct mbuf *
key_alloc_mbuf(l)
int l;
{
struct mbuf *m = NULL, *n;
int len, t;
len = l;
while (len > 0) {
MGET(n, M_DONTWAIT, MT_DATA);
if (n && len > MLEN)
MCLGET(n, M_DONTWAIT);
if (!n) {
m_freem(m);
return NULL;
}
n->m_next = NULL;
n->m_len = 0;
n->m_len = M_TRAILINGSPACE(n);
/* use the bottom of mbuf, hoping we can prepend afterwards */
if (n->m_len > len) {
t = (n->m_len - len) & ~(sizeof(long) - 1);
n->m_data += t;
n->m_len = len;
}
len -= n->m_len;
if (m)
m_cat(m, n);
else
m = n;
}
return m;
}
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