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8291fb89cf
freebsd-nq/sys/netipsec/key.c
Andrey V. Elsukov 8291fb89cf Fix bug in r308972 that leads to panic when non-compressed IPComp 
packet is received.

Reported by:	Denis Ahrens <denis h3q com>
MFC after:	3 days
2017-03-29 10:24:48 +00:00

8416 lines
218 KiB
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/* $FreeBSD$ */
/* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane 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.
*/
/*
* 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/fnv_hash.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/malloc.h>
#include <sys/rmlock.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/refcount.h>
#include <sys/syslog.h>
#include <vm/uma.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/vnet.h>
#include <net/raw_cb.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_var.h>
#include <netinet/udp.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/ip6_var.h>
#endif /* INET6 */
#include <net/pfkeyv2.h>
#include <netipsec/keydb.h>
#include <netipsec/key.h>
#include <netipsec/keysock.h>
#include <netipsec/key_debug.h>
#include <netipsec/ipsec.h>
#ifdef INET6
#include <netipsec/ipsec6.h>
#endif
#include <netipsec/xform.h>
#include <machine/in_cksum.h>
#include <machine/stdarg.h>
/* randomness */
#include <sys/random.h>
#define FULLMASK 0xff
#define _BITS(bytes) ((bytes) << 3)
/*
* 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 key_delsav(), when the reference count
* field hits 0 (= no external reference other than from SA header.
*/
VNET_DEFINE(u_int32_t, key_debug_level) = 0;
static VNET_DEFINE(u_int, key_spi_trycnt) = 1000;
static VNET_DEFINE(u_int32_t, key_spi_minval) = 0x100;
static VNET_DEFINE(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */
static VNET_DEFINE(u_int32_t, policy_id) = 0;
/*interval to initialize randseed,1(m)*/
static VNET_DEFINE(u_int, key_int_random) = 60;
/* interval to expire acquiring, 30(s)*/
static VNET_DEFINE(u_int, key_larval_lifetime) = 30;
/* counter for blocking SADB_ACQUIRE.*/
static VNET_DEFINE(int, key_blockacq_count) = 10;
/* lifetime for blocking SADB_ACQUIRE.*/
static VNET_DEFINE(int, key_blockacq_lifetime) = 20;
/* preferred old sa rather than new sa.*/
static VNET_DEFINE(int, key_preferred_oldsa) = 1;
#define V_key_spi_trycnt VNET(key_spi_trycnt)
#define V_key_spi_minval VNET(key_spi_minval)
#define V_key_spi_maxval VNET(key_spi_maxval)
#define V_policy_id VNET(policy_id)
#define V_key_int_random VNET(key_int_random)
#define V_key_larval_lifetime VNET(key_larval_lifetime)
#define V_key_blockacq_count VNET(key_blockacq_count)
#define V_key_blockacq_lifetime VNET(key_blockacq_lifetime)
#define V_key_preferred_oldsa VNET(key_preferred_oldsa)
static VNET_DEFINE(u_int32_t, acq_seq) = 0;
#define V_acq_seq VNET(acq_seq)
static VNET_DEFINE(uint32_t, sp_genid) = 0;
#define V_sp_genid VNET(sp_genid)
/* SPD */
TAILQ_HEAD(secpolicy_queue, secpolicy);
LIST_HEAD(secpolicy_list, secpolicy);
static VNET_DEFINE(struct secpolicy_queue, sptree[IPSEC_DIR_MAX]);
static VNET_DEFINE(struct secpolicy_queue, sptree_ifnet[IPSEC_DIR_MAX]);
static struct rmlock sptree_lock;
#define V_sptree VNET(sptree)
#define V_sptree_ifnet VNET(sptree_ifnet)
#define SPTREE_LOCK_INIT() rm_init(&sptree_lock, "sptree")
#define SPTREE_LOCK_DESTROY() rm_destroy(&sptree_lock)
#define SPTREE_RLOCK_TRACKER struct rm_priotracker sptree_tracker
#define SPTREE_RLOCK() rm_rlock(&sptree_lock, &sptree_tracker)
#define SPTREE_RUNLOCK() rm_runlock(&sptree_lock, &sptree_tracker)
#define SPTREE_RLOCK_ASSERT() rm_assert(&sptree_lock, RA_RLOCKED)
#define SPTREE_WLOCK() rm_wlock(&sptree_lock)
#define SPTREE_WUNLOCK() rm_wunlock(&sptree_lock)
#define SPTREE_WLOCK_ASSERT() rm_assert(&sptree_lock, RA_WLOCKED)
#define SPTREE_UNLOCK_ASSERT() rm_assert(&sptree_lock, RA_UNLOCKED)
/* Hash table for lookup SP using unique id */
static VNET_DEFINE(struct secpolicy_list *, sphashtbl);
static VNET_DEFINE(u_long, sphash_mask);
#define V_sphashtbl VNET(sphashtbl)
#define V_sphash_mask VNET(sphash_mask)
#define SPHASH_NHASH_LOG2 7
#define SPHASH_NHASH (1 << SPHASH_NHASH_LOG2)
#define SPHASH_HASHVAL(id) (key_u32hash(id) & V_sphash_mask)
#define SPHASH_HASH(id) &V_sphashtbl[SPHASH_HASHVAL(id)]
/* SAD */
TAILQ_HEAD(secashead_queue, secashead);
LIST_HEAD(secashead_list, secashead);
static VNET_DEFINE(struct secashead_queue, sahtree);
static struct rmlock sahtree_lock;
#define V_sahtree VNET(sahtree)
#define SAHTREE_LOCK_INIT() rm_init(&sahtree_lock, "sahtree")
#define SAHTREE_LOCK_DESTROY() rm_destroy(&sahtree_lock)
#define SAHTREE_RLOCK_TRACKER struct rm_priotracker sahtree_tracker
#define SAHTREE_RLOCK() rm_rlock(&sahtree_lock, &sahtree_tracker)
#define SAHTREE_RUNLOCK() rm_runlock(&sahtree_lock, &sahtree_tracker)
#define SAHTREE_RLOCK_ASSERT() rm_assert(&sahtree_lock, RA_RLOCKED)
#define SAHTREE_WLOCK() rm_wlock(&sahtree_lock)
#define SAHTREE_WUNLOCK() rm_wunlock(&sahtree_lock)
#define SAHTREE_WLOCK_ASSERT() rm_assert(&sahtree_lock, RA_WLOCKED)
#define SAHTREE_UNLOCK_ASSERT() rm_assert(&sahtree_lock, RA_UNLOCKED)
/* Hash table for lookup in SAD using SA addresses */
static VNET_DEFINE(struct secashead_list *, sahaddrhashtbl);
static VNET_DEFINE(u_long, sahaddrhash_mask);
#define V_sahaddrhashtbl VNET(sahaddrhashtbl)
#define V_sahaddrhash_mask VNET(sahaddrhash_mask)
#define SAHHASH_NHASH_LOG2 7
#define SAHHASH_NHASH (1 << SAHHASH_NHASH_LOG2)
#define SAHADDRHASH_HASHVAL(saidx) \
(key_saidxhash(saidx) & V_sahaddrhash_mask)
#define SAHADDRHASH_HASH(saidx) \
&V_sahaddrhashtbl[SAHADDRHASH_HASHVAL(saidx)]
/* Hash table for lookup in SAD using SPI */
LIST_HEAD(secasvar_list, secasvar);
static VNET_DEFINE(struct secasvar_list *, savhashtbl);
static VNET_DEFINE(u_long, savhash_mask);
#define V_savhashtbl VNET(savhashtbl)
#define V_savhash_mask VNET(savhash_mask)
#define SAVHASH_NHASH_LOG2 7
#define SAVHASH_NHASH (1 << SAVHASH_NHASH_LOG2)
#define SAVHASH_HASHVAL(spi) (key_u32hash(spi) & V_savhash_mask)
#define SAVHASH_HASH(spi) &V_savhashtbl[SAVHASH_HASHVAL(spi)]
static uint32_t
key_saidxhash(const struct secasindex *saidx)
{
uint32_t hval;
hval = fnv_32_buf(&saidx->proto, sizeof(saidx->proto),
FNV1_32_INIT);
switch (saidx->dst.sa.sa_family) {
#ifdef INET
case AF_INET:
hval = fnv_32_buf(&saidx->src.sin.sin_addr,
sizeof(in_addr_t), hval);
hval = fnv_32_buf(&saidx->dst.sin.sin_addr,
sizeof(in_addr_t), hval);
break;
#endif
#ifdef INET6
case AF_INET6:
hval = fnv_32_buf(&saidx->src.sin6.sin6_addr,
sizeof(struct in6_addr), hval);
hval = fnv_32_buf(&saidx->dst.sin6.sin6_addr,
sizeof(struct in6_addr), hval);
break;
#endif
default:
hval = 0;
ipseclog((LOG_DEBUG, "%s: unknown address family %d",
__func__, saidx->dst.sa.sa_family));
}
return (hval);
}
static uint32_t
key_u32hash(uint32_t val)
{
return (fnv_32_buf(&val, sizeof(val), FNV1_32_INIT));
}
/* registed list */
static VNET_DEFINE(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]);
#define V_regtree VNET(regtree)
static struct mtx regtree_lock;
#define REGTREE_LOCK_INIT() \
mtx_init(&regtree_lock, "regtree", "fast ipsec regtree", MTX_DEF)
#define REGTREE_LOCK_DESTROY() mtx_destroy(&regtree_lock)
#define REGTREE_LOCK() mtx_lock(&regtree_lock)
#define REGTREE_UNLOCK() mtx_unlock(&regtree_lock)
#define REGTREE_LOCK_ASSERT() mtx_assert(&regtree_lock, MA_OWNED)
/* Acquiring list */
LIST_HEAD(secacq_list, secacq);
static VNET_DEFINE(struct secacq_list, acqtree);
#define V_acqtree VNET(acqtree)
static struct mtx acq_lock;
#define ACQ_LOCK_INIT() \
mtx_init(&acq_lock, "acqtree", "ipsec SA acquiring list", MTX_DEF)
#define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock)
#define ACQ_LOCK() mtx_lock(&acq_lock)
#define ACQ_UNLOCK() mtx_unlock(&acq_lock)
#define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED)
/* Hash table for lookup in ACQ list using SA addresses */
static VNET_DEFINE(struct secacq_list *, acqaddrhashtbl);
static VNET_DEFINE(u_long, acqaddrhash_mask);
#define V_acqaddrhashtbl VNET(acqaddrhashtbl)
#define V_acqaddrhash_mask VNET(acqaddrhash_mask)
/* Hash table for lookup in ACQ list using SEQ number */
static VNET_DEFINE(struct secacq_list *, acqseqhashtbl);
static VNET_DEFINE(u_long, acqseqhash_mask);
#define V_acqseqhashtbl VNET(acqseqhashtbl)
#define V_acqseqhash_mask VNET(acqseqhash_mask)
#define ACQHASH_NHASH_LOG2 7
#define ACQHASH_NHASH (1 << ACQHASH_NHASH_LOG2)
#define ACQADDRHASH_HASHVAL(saidx) \
(key_saidxhash(saidx) & V_acqaddrhash_mask)
#define ACQSEQHASH_HASHVAL(seq) \
(key_u32hash(seq) & V_acqseqhash_mask)
#define ACQADDRHASH_HASH(saidx) \
&V_acqaddrhashtbl[ACQADDRHASH_HASHVAL(saidx)]
#define ACQSEQHASH_HASH(seq) \
&V_acqseqhashtbl[ACQSEQHASH_HASHVAL(seq)]
/* SP acquiring list */
static VNET_DEFINE(LIST_HEAD(_spacqtree, secspacq), spacqtree);
#define V_spacqtree VNET(spacqtree)
static struct mtx spacq_lock;
#define SPACQ_LOCK_INIT() \
mtx_init(&spacq_lock, "spacqtree", \
"fast ipsec security policy acquire list", MTX_DEF)
#define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock)
#define SPACQ_LOCK() mtx_lock(&spacq_lock)
#define SPACQ_UNLOCK() mtx_unlock(&spacq_lock)
#define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED)
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 */
sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */
sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */
sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */
sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAI */
sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAR */
sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */
sizeof(struct sadb_x_sa_replay), /* SADB_X_EXT_SA_REPLAY */
sizeof(struct sadb_address), /* SADB_X_EXT_NEW_ADDRESS_SRC */
sizeof(struct sadb_address), /* SADB_X_EXT_NEW_ADDRESS_DST */
};
_Static_assert(sizeof(minsize)/sizeof(int) == SADB_EXT_MAX + 1, "minsize size mismatch");
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 */
sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */
sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */
sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */
0, /* SADB_X_EXT_NAT_T_OAI */
0, /* SADB_X_EXT_NAT_T_OAR */
sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */
sizeof(struct sadb_x_sa_replay), /* SADB_X_EXT_SA_REPLAY */
0, /* SADB_X_EXT_NEW_ADDRESS_SRC */
0, /* SADB_X_EXT_NEW_ADDRESS_DST */
};
_Static_assert(sizeof(maxsize)/sizeof(int) == SADB_EXT_MAX + 1, "minsize size mismatch");
/*
* Internal values for SA flags:
* SADB_X_EXT_F_CLONED means that SA was cloned by key_updateaddresses,
* thus we will not free the most of SA content in key_delsav().
*/
#define SADB_X_EXT_F_CLONED 0x80000000
#define SADB_CHECKLEN(_mhp, _ext) \
((_mhp)->extlen[(_ext)] < minsize[(_ext)] || (maxsize[(_ext)] != 0 && \
((_mhp)->extlen[(_ext)] > maxsize[(_ext)])))
#define SADB_CHECKHDR(_mhp, _ext) ((_mhp)->ext[(_ext)] == NULL)
static VNET_DEFINE(int, ipsec_esp_keymin) = 256;
static VNET_DEFINE(int, ipsec_esp_auth) = 0;
static VNET_DEFINE(int, ipsec_ah_keymin) = 128;
#define V_ipsec_esp_keymin VNET(ipsec_esp_keymin)
#define V_ipsec_esp_auth VNET(ipsec_esp_auth)
#define V_ipsec_ah_keymin VNET(ipsec_ah_keymin)
#ifdef IPSEC_DEBUG
VNET_DEFINE(int, ipsec_debug) = 1;
#else
VNET_DEFINE(int, ipsec_debug) = 0;
#endif
#ifdef INET
SYSCTL_DECL(_net_inet_ipsec);
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, debug,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_debug), 0,
"Enable IPsec debugging output when set.");
#endif
#ifdef INET6
SYSCTL_DECL(_net_inet6_ipsec6);
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, debug,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_debug), 0,
"Enable IPsec debugging output when set.");
#endif
SYSCTL_DECL(_net_key);
SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_debug_level), 0, "");
/* max count of trial for the decision of spi value */
SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_trycnt), 0, "");
/* minimum spi value to allocate automatically. */
SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_minval), 0, "");
/* maximun spi value to allocate automatically. */
SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_maxval), 0, "");
/* interval to initialize randseed */
SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_int_random), 0, "");
/* lifetime for larval SA */
SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_larval_lifetime), 0, "");
/* counter for blocking to send SADB_ACQUIRE to IKEd */
SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_count), 0, "");
/* lifetime for blocking to send SADB_ACQUIRE to IKEd */
SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, "");
/* ESP auth */
SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, "");
/* minimum ESP key length */
SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, "");
/* minimum AH key length */
SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_ah_keymin), 0, "");
/* perfered old SA rather than new SA */
SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, preferred_oldsa,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_preferred_oldsa), 0, "");
#define __LIST_CHAINED(elm) \
(!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL))
MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association");
MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head");
MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy");
MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request");
MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous");
MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire");
MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire");
static VNET_DEFINE(uma_zone_t, key_lft_zone);
#define V_key_lft_zone VNET(key_lft_zone)
static LIST_HEAD(xforms_list, xformsw) xforms = LIST_HEAD_INITIALIZER();
static struct mtx xforms_lock;
#define XFORMS_LOCK_INIT() \
mtx_init(&xforms_lock, "xforms_list", "IPsec transforms list", MTX_DEF)
#define XFORMS_LOCK_DESTROY() mtx_destroy(&xforms_lock)
#define XFORMS_LOCK() mtx_lock(&xforms_lock)
#define XFORMS_UNLOCK() mtx_unlock(&xforms_lock)
/*
* set parameters into secpolicyindex buffer.
* Must allocate secpolicyindex buffer passed to this function.
*/
#define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \
do { \
bzero((idx), sizeof(struct secpolicyindex)); \
(idx)->dir = (_dir); \
(idx)->prefs = (ps); \
(idx)->prefd = (pd); \
(idx)->ul_proto = (ulp); \
bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
} while (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, ((const struct sockaddr *)(s))->sa_len); \
bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
key_porttosaddr(&(idx)->src.sa, 0); \
key_porttosaddr(&(idx)->dst.sa, 0); \
} while (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 supported_ealgs {
int sadb_alg;
const struct enc_xform *xform;
} supported_ealgs[] = {
{ SADB_EALG_DESCBC, &enc_xform_des },
{ SADB_EALG_3DESCBC, &enc_xform_3des },
{ SADB_X_EALG_AES, &enc_xform_rijndael128 },
{ SADB_X_EALG_BLOWFISHCBC, &enc_xform_blf },
{ SADB_X_EALG_CAST128CBC, &enc_xform_cast5 },
{ SADB_EALG_NULL, &enc_xform_null },
{ SADB_X_EALG_CAMELLIACBC, &enc_xform_camellia },
{ SADB_X_EALG_AESCTR, &enc_xform_aes_icm },
{ SADB_X_EALG_AESGCM16, &enc_xform_aes_nist_gcm },
{ SADB_X_EALG_AESGMAC, &enc_xform_aes_nist_gmac },
};
static struct supported_aalgs {
int sadb_alg;
const struct auth_hash *xform;
} supported_aalgs[] = {
{ SADB_X_AALG_NULL, &auth_hash_null },
{ SADB_AALG_MD5HMAC, &auth_hash_hmac_md5 },
{ SADB_AALG_SHA1HMAC, &auth_hash_hmac_sha1 },
{ SADB_X_AALG_RIPEMD160HMAC, &auth_hash_hmac_ripemd_160 },
{ SADB_X_AALG_MD5, &auth_hash_key_md5 },
{ SADB_X_AALG_SHA, &auth_hash_key_sha1 },
{ SADB_X_AALG_SHA2_256, &auth_hash_hmac_sha2_256 },
{ SADB_X_AALG_SHA2_384, &auth_hash_hmac_sha2_384 },
{ SADB_X_AALG_SHA2_512, &auth_hash_hmac_sha2_512 },
{ SADB_X_AALG_AES128GMAC, &auth_hash_nist_gmac_aes_128 },
{ SADB_X_AALG_AES192GMAC, &auth_hash_nist_gmac_aes_192 },
{ SADB_X_AALG_AES256GMAC, &auth_hash_nist_gmac_aes_256 },
};
static struct supported_calgs {
int sadb_alg;
const struct comp_algo *xform;
} supported_calgs[] = {
{ SADB_X_CALG_DEFLATE, &comp_algo_deflate },
};
#ifndef IPSEC_DEBUG2
static struct callout key_timer;
#endif
static void key_unlink(struct secpolicy *);
static struct secpolicy *key_getsp(struct secpolicyindex *);
static struct secpolicy *key_getspbyid(u_int32_t);
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 uint32_t key_getnewspid(void);
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 struct mbuf *key_sp2mbuf(struct secpolicy *);
static size_t key_getspreqmsglen(struct secpolicy *);
static int key_spdexpire(struct secpolicy *);
static struct secashead *key_newsah(struct secasindex *);
static void key_freesah(struct secashead **);
static void key_delsah(struct secashead *);
static struct secasvar *key_newsav(const struct sadb_msghdr *,
struct secasindex *, uint32_t, int *);
static void key_delsav(struct secasvar *);
static void key_unlinksav(struct secasvar *);
static struct secashead *key_getsah(struct secasindex *);
static int key_checkspidup(uint32_t);
static struct secasvar *key_getsavbyspi(uint32_t);
static int key_setnatt(struct secasvar *, const struct sadb_msghdr *);
static int key_setsaval(struct secasvar *, const struct sadb_msghdr *);
static int key_updatelifetimes(struct secasvar *, const struct sadb_msghdr *);
static int key_updateaddresses(struct socket *, struct mbuf *,
const struct sadb_msghdr *, struct secasvar *, struct secasindex *);
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,
const struct sockaddr *, u_int8_t, u_int16_t);
static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t);
static struct mbuf *key_setsadbxtype(u_int16_t);
static struct mbuf *key_setsadbxsa2(u_int8_t, u_int32_t, u_int32_t);
static struct mbuf *key_setsadbxsareplay(u_int32_t);
static struct mbuf *key_setsadbxpolicy(u_int16_t, u_int8_t,
u_int32_t, u_int32_t);
static struct seckey *key_dup_keymsg(const struct sadb_key *, size_t,
struct malloc_type *);
static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src,
struct malloc_type *);
/* 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, reaid. */
#define CMP_EXACTLY 4 /* all elements. */
static int key_cmpsaidx(const struct secasindex *,
const struct secasindex *, int);
static int key_cmpspidx_exactly(struct secpolicyindex *,
struct secpolicyindex *);
static int key_cmpspidx_withmask(struct secpolicyindex *,
struct secpolicyindex *);
static int key_bbcmp(const void *, const void *, u_int);
static uint8_t key_satype2proto(uint8_t);
static uint8_t key_proto2satype(uint8_t);
static int key_getspi(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static uint32_t key_do_getnewspi(struct sadb_spirange *, struct secasindex *);
static int key_update(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_add(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static int key_setident(struct secashead *, 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_delete_all(struct socket *, struct mbuf *,
const struct sadb_msghdr *, struct secasindex *);
static void key_delete_xform(const struct xformsw *);
static int key_get(struct socket *, struct mbuf *,
const struct sadb_msghdr *);
static void key_getcomb_setlifetime(struct sadb_comb *);
static struct mbuf *key_getcomb_ealg(void);
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(const struct secasindex *, struct secpolicy *);
static uint32_t key_newacq(const struct secasindex *, int *);
static uint32_t key_getacq(const struct secasindex *, int *);
static int key_acqdone(const struct secasindex *, uint32_t);
static int key_acqreset(uint32_t);
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 *, int);
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(const struct sadb_ext *, int);
static int key_align(struct mbuf *, struct sadb_msghdr *);
static struct mbuf *key_setlifetime(struct seclifetime *, uint16_t);
static struct mbuf *key_setkey(struct seckey *, uint16_t);
static int xform_init(struct secasvar *, u_short);
#define DBG_IPSEC_INITREF(t, p) do { \
refcount_init(&(p)->refcnt, 1); \
KEYDBG(KEY_STAMP, \
printf("%s: Initialize refcnt %s(%p) = %u\n", \
__func__, #t, (p), (p)->refcnt)); \
} while (0)
#define DBG_IPSEC_ADDREF(t, p) do { \
refcount_acquire(&(p)->refcnt); \
KEYDBG(KEY_STAMP, \
printf("%s: Acquire refcnt %s(%p) -> %u\n", \
__func__, #t, (p), (p)->refcnt)); \
} while (0)
#define DBG_IPSEC_DELREF(t, p) do { \
KEYDBG(KEY_STAMP, \
printf("%s: Release refcnt %s(%p) -> %u\n", \
__func__, #t, (p), (p)->refcnt - 1)); \
refcount_release(&(p)->refcnt); \
} while (0)
#define IPSEC_INITREF(t, p) refcount_init(&(p)->refcnt, 1)
#define IPSEC_ADDREF(t, p) refcount_acquire(&(p)->refcnt)
#define IPSEC_DELREF(t, p) refcount_release(&(p)->refcnt)
#define SP_INITREF(p) IPSEC_INITREF(SP, p)
#define SP_ADDREF(p) IPSEC_ADDREF(SP, p)
#define SP_DELREF(p) IPSEC_DELREF(SP, p)
#define SAH_INITREF(p) IPSEC_INITREF(SAH, p)
#define SAH_ADDREF(p) IPSEC_ADDREF(SAH, p)
#define SAH_DELREF(p) IPSEC_DELREF(SAH, p)
#define SAV_INITREF(p) IPSEC_INITREF(SAV, p)
#define SAV_ADDREF(p) IPSEC_ADDREF(SAV, p)
#define SAV_DELREF(p) IPSEC_DELREF(SAV, p)
/*
* Update the refcnt while holding the SPTREE lock.
*/
void
key_addref(struct secpolicy *sp)
{
SP_ADDREF(sp);
}
/*
* Return 0 when there are known to be no SP's for the specified
* direction. Otherwise return 1. This is used by IPsec code
* to optimize performance.
*/
int
key_havesp(u_int dir)
{
return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ?
TAILQ_FIRST(&V_sptree[dir]) != NULL : 1);
}
/* %%% IPsec policy management */
/*
* Return current SPDB generation.
*/
uint32_t
key_getspgen(void)
{
return (V_sp_genid);
}
void
key_bumpspgen(void)
{
V_sp_genid++;
}
static int
key_checksockaddrs(struct sockaddr *src, struct sockaddr *dst)
{
/* family match */
if (src->sa_family != dst->sa_family)
return (EINVAL);
/* sa_len match */
if (src->sa_len != dst->sa_len)
return (EINVAL);
switch (src->sa_family) {
#ifdef INET
case AF_INET:
if (src->sa_len != sizeof(struct sockaddr_in))
return (EINVAL);
break;
#endif
#ifdef INET6
case AF_INET6:
if (src->sa_len != sizeof(struct sockaddr_in6))
return (EINVAL);
break;
#endif
default:
return (EAFNOSUPPORT);
}
return (0);
}
/*
* 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(struct secpolicyindex *spidx, u_int dir)
{
SPTREE_RLOCK_TRACKER;
struct secpolicy *sp;
IPSEC_ASSERT(spidx != NULL, ("null spidx"));
IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
("invalid direction %u", dir));
SPTREE_RLOCK();
TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
if (key_cmpspidx_withmask(&sp->spidx, spidx)) {
SP_ADDREF(sp);
break;
}
}
SPTREE_RUNLOCK();
if (sp != NULL) { /* found a SPD entry */
sp->lastused = time_second;
KEYDBG(IPSEC_STAMP,
printf("%s: return SP(%p)\n", __func__, sp));
KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
} else {
KEYDBG(IPSEC_DATA,
printf("%s: lookup failed for ", __func__);
kdebug_secpolicyindex(spidx, NULL));
}
return (sp);
}
/*
* Allocating an SA entry for an *INBOUND* or *OUTBOUND* TCP packet, signed
* or should be signed by MD5 signature.
* We don't use key_allocsa() for such lookups, because we don't know SPI.
* Unlike ESP and AH protocols, SPI isn't transmitted in the TCP header with
* signed packet. We use SADB only as storage for password.
* OUT: positive: corresponding SA for given saidx found.
* NULL: SA not found
*/
struct secasvar *
key_allocsa_tcpmd5(struct secasindex *saidx)
{
SAHTREE_RLOCK_TRACKER;
struct secashead *sah;
struct secasvar *sav;
IPSEC_ASSERT(saidx->proto == IPPROTO_TCP,
("unexpected security protocol %u", saidx->proto));
IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TCPMD5,
("unexpected mode %u", saidx->mode));
SAHTREE_RLOCK();
LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
KEYDBG(IPSEC_DUMP,
printf("%s: checking SAH\n", __func__);
kdebug_secash(sah, " "));
if (sah->saidx.proto != IPPROTO_TCP)
continue;
if (!key_sockaddrcmp(&saidx->dst.sa, &sah->saidx.dst.sa, 0))
break;
}
if (sah != NULL) {
if (V_key_preferred_oldsa)
sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
else
sav = TAILQ_FIRST(&sah->savtree_alive);
if (sav != NULL)
SAV_ADDREF(sav);
} else
sav = NULL;
SAHTREE_RUNLOCK();
if (sav != NULL) {
KEYDBG(IPSEC_STAMP,
printf("%s: return SA(%p)\n", __func__, sav));
KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
} else {
KEYDBG(IPSEC_STAMP,
printf("%s: SA not found\n", __func__));
KEYDBG(IPSEC_DATA, kdebug_secasindex(saidx, NULL));
}
return (sav);
}
/*
* Allocating an SA entry for an *OUTBOUND* packet.
* OUT: positive: corresponding SA for given saidx found.
* NULL: SA not found, but will be acquired, check *error
* for acquiring status.
*/
struct secasvar *
key_allocsa_policy(struct secpolicy *sp, const struct secasindex *saidx,
int *error)
{
SAHTREE_RLOCK_TRACKER;
struct secashead *sah;
struct secasvar *sav;
IPSEC_ASSERT(saidx != NULL, ("null saidx"));
IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT ||
saidx->mode == IPSEC_MODE_TUNNEL,
("unexpected policy %u", saidx->mode));
/*
* We check new SA 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.
*/
SAHTREE_RLOCK();
LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
KEYDBG(IPSEC_DUMP,
printf("%s: checking SAH\n", __func__);
kdebug_secash(sah, " "));
if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID))
break;
}
if (sah != NULL) {
/*
* Allocate the oldest SA available according to
* draft-jenkins-ipsec-rekeying-03.
*/
if (V_key_preferred_oldsa)
sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
else
sav = TAILQ_FIRST(&sah->savtree_alive);
if (sav != NULL)
SAV_ADDREF(sav);
} else
sav = NULL;
SAHTREE_RUNLOCK();
if (sav != NULL) {
*error = 0;
KEYDBG(IPSEC_STAMP,
printf("%s: chosen SA(%p) for SP(%p)\n", __func__,
sav, sp));
KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
return (sav); /* return referenced SA */
}
/* there is no SA */
*error = key_acquire(saidx, sp);
if ((*error) != 0)
ipseclog((LOG_DEBUG,
"%s: error %d returned from key_acquire()\n",
__func__, *error));
KEYDBG(IPSEC_STAMP,
printf("%s: acquire SA for SP(%p), error %d\n",
__func__, sp, *error));
KEYDBG(IPSEC_DATA, kdebug_secasindex(saidx, NULL));
return (NULL);
}
/*
* allocating a usable SA entry for a *INBOUND* packet.
* Must call key_freesav() later.
* OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state).
* NULL: not found, or error occurred.
*
* According to RFC 2401 SA is uniquely identified by a triple SPI,
* destination address, and security protocol. But according to RFC 4301,
* SPI by itself suffices to specify an SA.
*
* 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(union sockaddr_union *dst, uint8_t proto, uint32_t spi)
{
SAHTREE_RLOCK_TRACKER;
struct secasvar *sav;
IPSEC_ASSERT(proto == IPPROTO_ESP || proto == IPPROTO_AH ||
proto == IPPROTO_IPCOMP, ("unexpected security protocol %u",
proto));
SAHTREE_RLOCK();
LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
if (sav->spi == spi)
break;
}
/*
* We use single SPI namespace for all protocols, so it is
* impossible to have SPI duplicates in the SAVHASH.
*/
if (sav != NULL) {
if (sav->state != SADB_SASTATE_LARVAL &&
sav->sah->saidx.proto == proto &&
key_sockaddrcmp(&dst->sa,
&sav->sah->saidx.dst.sa, 0) == 0)
SAV_ADDREF(sav);
else
sav = NULL;
}
SAHTREE_RUNLOCK();
if (sav == NULL) {
KEYDBG(IPSEC_STAMP,
char buf[IPSEC_ADDRSTRLEN];
printf("%s: SA not found for spi %u proto %u dst %s\n",
__func__, ntohl(spi), proto, ipsec_address(dst, buf,
sizeof(buf))));
} else {
KEYDBG(IPSEC_STAMP,
printf("%s: return SA(%p)\n", __func__, sav));
KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
}
return (sav);
}
struct secasvar *
key_allocsa_tunnel(union sockaddr_union *src, union sockaddr_union *dst,
uint8_t proto)
{
SAHTREE_RLOCK_TRACKER;
struct secasindex saidx;
struct secashead *sah;
struct secasvar *sav;
IPSEC_ASSERT(src != NULL, ("null src address"));
IPSEC_ASSERT(dst != NULL, ("null dst address"));
KEY_SETSECASIDX(proto, IPSEC_MODE_TUNNEL, 0, &src->sa,
&dst->sa, &saidx);
sav = NULL;
SAHTREE_RLOCK();
LIST_FOREACH(sah, SAHADDRHASH_HASH(&saidx), addrhash) {
if (IPSEC_MODE_TUNNEL != sah->saidx.mode)
continue;
if (proto != sah->saidx.proto)
continue;
if (key_sockaddrcmp(&src->sa, &sah->saidx.src.sa, 0) != 0)
continue;
if (key_sockaddrcmp(&dst->sa, &sah->saidx.dst.sa, 0) != 0)
continue;
/* XXXAE: is key_preferred_oldsa reasonably?*/
if (V_key_preferred_oldsa)
sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
else
sav = TAILQ_FIRST(&sah->savtree_alive);
if (sav != NULL) {
SAV_ADDREF(sav);
break;
}
}
SAHTREE_RUNLOCK();
KEYDBG(IPSEC_STAMP,
printf("%s: return SA(%p)\n", __func__, sav));
if (sav != NULL)
KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
return (sav);
}
/*
* Must be called after calling key_allocsp().
*/
void
key_freesp(struct secpolicy **spp)
{
struct secpolicy *sp = *spp;
IPSEC_ASSERT(sp != NULL, ("null sp"));
if (SP_DELREF(sp) == 0)
return;
KEYDBG(IPSEC_STAMP,
printf("%s: last reference to SP(%p)\n", __func__, sp));
KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
*spp = NULL;
while (sp->tcount > 0)
ipsec_delisr(sp->req[--sp->tcount]);
free(sp, M_IPSEC_SP);
}
static void
key_unlink(struct secpolicy *sp)
{
IPSEC_ASSERT(sp->spidx.dir == IPSEC_DIR_INBOUND ||
sp->spidx.dir == IPSEC_DIR_OUTBOUND,
("invalid direction %u", sp->spidx.dir));
SPTREE_UNLOCK_ASSERT();
KEYDBG(KEY_STAMP,
printf("%s: SP(%p)\n", __func__, sp));
SPTREE_WLOCK();
if (sp->state != IPSEC_SPSTATE_ALIVE) {
/* SP is already unlinked */
SPTREE_WUNLOCK();
return;
}
sp->state = IPSEC_SPSTATE_DEAD;
TAILQ_REMOVE(&V_sptree[sp->spidx.dir], sp, chain);
LIST_REMOVE(sp, idhash);
V_sp_genid++;
SPTREE_WUNLOCK();
key_freesp(&sp);
}
/*
* insert a secpolicy into the SP database. Lower priorities first
*/
static void
key_insertsp(struct secpolicy *newsp)
{
struct secpolicy *sp;
SPTREE_WLOCK_ASSERT();
TAILQ_FOREACH(sp, &V_sptree[newsp->spidx.dir], chain) {
if (newsp->priority < sp->priority) {
TAILQ_INSERT_BEFORE(sp, newsp, chain);
goto done;
}
}
TAILQ_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, chain);
done:
LIST_INSERT_HEAD(SPHASH_HASH(newsp->id), newsp, idhash);
newsp->state = IPSEC_SPSTATE_ALIVE;
V_sp_genid++;
}
/*
* Insert a bunch of VTI secpolicies into the SPDB.
* We keep VTI policies in the separate list due to following reasons:
* 1) they should be immutable to user's or some deamon's attempts to
* delete. The only way delete such policies - destroy or unconfigure
* corresponding virtual inteface.
* 2) such policies have traffic selector that matches all traffic per
* address family.
* Since all VTI policies have the same priority, we don't care about
* policies order.
*/
int
key_register_ifnet(struct secpolicy **spp, u_int count)
{
struct mbuf *m;
u_int i;
SPTREE_WLOCK();
/*
* First of try to acquire id for each SP.
*/
for (i = 0; i < count; i++) {
IPSEC_ASSERT(spp[i]->spidx.dir == IPSEC_DIR_INBOUND ||
spp[i]->spidx.dir == IPSEC_DIR_OUTBOUND,
("invalid direction %u", spp[i]->spidx.dir));
if ((spp[i]->id = key_getnewspid()) == 0) {
SPTREE_WUNLOCK();
return (EAGAIN);
}
}
for (i = 0; i < count; i++) {
TAILQ_INSERT_TAIL(&V_sptree_ifnet[spp[i]->spidx.dir],
spp[i], chain);
/*
* NOTE: despite the fact that we keep VTI SP in the
* separate list, SPHASH contains policies from both
* sources. Thus SADB_X_SPDGET will correctly return
* SP by id, because it uses SPHASH for lookups.
*/
LIST_INSERT_HEAD(SPHASH_HASH(spp[i]->id), spp[i], idhash);
spp[i]->state = IPSEC_SPSTATE_IFNET;
}
SPTREE_WUNLOCK();
/*
* Notify user processes about new SP.
*/
for (i = 0; i < count; i++) {
m = key_setdumpsp(spp[i], SADB_X_SPDADD, 0, 0);
if (m != NULL)
key_sendup_mbuf(NULL, m, KEY_SENDUP_ALL);
}
return (0);
}
void
key_unregister_ifnet(struct secpolicy **spp, u_int count)
{
struct mbuf *m;
u_int i;
SPTREE_WLOCK();
for (i = 0; i < count; i++) {
IPSEC_ASSERT(spp[i]->spidx.dir == IPSEC_DIR_INBOUND ||
spp[i]->spidx.dir == IPSEC_DIR_OUTBOUND,
("invalid direction %u", spp[i]->spidx.dir));
if (spp[i]->state != IPSEC_SPSTATE_IFNET)
continue;
spp[i]->state = IPSEC_SPSTATE_DEAD;
TAILQ_REMOVE(&V_sptree_ifnet[spp[i]->spidx.dir],
spp[i], chain);
LIST_REMOVE(spp[i], idhash);
}
SPTREE_WUNLOCK();
for (i = 0; i < count; i++) {
m = key_setdumpsp(spp[i], SADB_X_SPDDELETE, 0, 0);
if (m != NULL)
key_sendup_mbuf(NULL, m, KEY_SENDUP_ALL);
}
}
/*
* 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(struct secasvar **psav)
{
struct secasvar *sav = *psav;
IPSEC_ASSERT(sav != NULL, ("null sav"));
if (SAV_DELREF(sav) == 0)
return;
KEYDBG(IPSEC_STAMP,
printf("%s: last reference to SA(%p)\n", __func__, sav));
*psav = NULL;
key_delsav(sav);
}
/*
* Unlink SA from SAH and SPI hash under SAHTREE_WLOCK.
* Expect that SA has extra reference due to lookup.
* Release this references, also release SAH reference after unlink.
*/
static void
key_unlinksav(struct secasvar *sav)
{
struct secashead *sah;
KEYDBG(KEY_STAMP,
printf("%s: SA(%p)\n", __func__, sav));
SAHTREE_UNLOCK_ASSERT();
SAHTREE_WLOCK();
if (sav->state == SADB_SASTATE_DEAD) {
/* SA is already unlinked */
SAHTREE_WUNLOCK();
return;
}
/* Unlink from SAH */
if (sav->state == SADB_SASTATE_LARVAL)
TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
else
TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
/* Unlink from SPI hash */
LIST_REMOVE(sav, spihash);
sav->state = SADB_SASTATE_DEAD;
sah = sav->sah;
SAHTREE_WUNLOCK();
key_freesav(&sav);
/* Since we are unlinked, release reference to SAH */
key_freesah(&sah);
}
/* %%% SPD management */
/*
* search SPD
* OUT: NULL : not found
* others : found, pointer to a SP.
*/
static struct secpolicy *
key_getsp(struct secpolicyindex *spidx)
{
SPTREE_RLOCK_TRACKER;
struct secpolicy *sp;
IPSEC_ASSERT(spidx != NULL, ("null spidx"));
SPTREE_RLOCK();
TAILQ_FOREACH(sp, &V_sptree[spidx->dir], chain) {
if (key_cmpspidx_exactly(spidx, &sp->spidx)) {
SP_ADDREF(sp);
break;
}
}
SPTREE_RUNLOCK();
return sp;
}
/*
* get SP by index.
* OUT: NULL : not found
* others : found, pointer to referenced SP.
*/
static struct secpolicy *
key_getspbyid(uint32_t id)
{
SPTREE_RLOCK_TRACKER;
struct secpolicy *sp;
SPTREE_RLOCK();
LIST_FOREACH(sp, SPHASH_HASH(id), idhash) {
if (sp->id == id) {
SP_ADDREF(sp);
break;
}
}
SPTREE_RUNLOCK();
return (sp);
}
struct secpolicy *
key_newsp(void)
{
struct secpolicy *sp;
sp = malloc(sizeof(*sp), M_IPSEC_SP, M_NOWAIT | M_ZERO);
if (sp != NULL)
SP_INITREF(sp);
return (sp);
}
struct ipsecrequest *
ipsec_newisr(void)
{
return (malloc(sizeof(struct ipsecrequest), M_IPSEC_SR,
M_NOWAIT | M_ZERO));
}
void
ipsec_delisr(struct ipsecrequest *p)
{
free(p, M_IPSEC_SR);
}
/*
* create secpolicy structure from sadb_x_policy structure.
* NOTE: `state', `secpolicyindex' and 'id' in secpolicy structure
* are not set, so must be set properly later.
*/
struct secpolicy *
key_msg2sp(struct sadb_x_policy *xpl0, size_t len, int *error)
{
struct secpolicy *newsp;
IPSEC_ASSERT(xpl0 != NULL, ("null xpl0"));
IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len));
if (len != PFKEY_EXTLEN(xpl0)) {
ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__));
*error = EINVAL;
return NULL;
}
if ((newsp = key_newsp()) == NULL) {
*error = ENOBUFS;
return NULL;
}
newsp->spidx.dir = xpl0->sadb_x_policy_dir;
newsp->policy = xpl0->sadb_x_policy_type;
newsp->priority = xpl0->sadb_x_policy_priority;
newsp->tcount = 0;
/* check policy */
switch (xpl0->sadb_x_policy_type) {
case IPSEC_POLICY_DISCARD:
case IPSEC_POLICY_NONE:
case IPSEC_POLICY_ENTRUST:
case IPSEC_POLICY_BYPASS:
break;
case IPSEC_POLICY_IPSEC:
{
struct sadb_x_ipsecrequest *xisr;
struct ipsecrequest *isr;
int tlen;
/* validity check */
if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) {
ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n",
__func__));
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, "%s: invalid ipsecrequest "
"length.\n", __func__));
key_freesp(&newsp);
*error = EINVAL;
return NULL;
}
if (newsp->tcount >= IPSEC_MAXREQ) {
ipseclog((LOG_DEBUG,
"%s: too many ipsecrequests.\n",
__func__));
key_freesp(&newsp);
*error = EINVAL;
return (NULL);
}
/* allocate request buffer */
/* NB: data structure is zero'd */
isr = ipsec_newisr();
if (isr == NULL) {
ipseclog((LOG_DEBUG,
"%s: No more memory.\n", __func__));
key_freesp(&newsp);
*error = ENOBUFS;
return NULL;
}
newsp->req[newsp->tcount++] = isr;
/* set values */
switch (xisr->sadb_x_ipsecrequest_proto) {
case IPPROTO_ESP:
case IPPROTO_AH:
case IPPROTO_IPCOMP:
break;
default:
ipseclog((LOG_DEBUG,
"%s: invalid proto type=%u\n", __func__,
xisr->sadb_x_ipsecrequest_proto));
key_freesp(&newsp);
*error = EPROTONOSUPPORT;
return NULL;
}
isr->saidx.proto =
(uint8_t)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,
"%s: invalid mode=%u\n", __func__,
xisr->sadb_x_ipsecrequest_mode));
key_freesp(&newsp);
*error = EINVAL;
return NULL;
}
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,
"%s: reqid=%d range "
"violation, updated by kernel.\n",
__func__,
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;
}
isr->saidx.reqid = reqid;
xisr->sadb_x_ipsecrequest_reqid = reqid;
} else {
/* set it for manual keying. */
isr->saidx.reqid =
xisr->sadb_x_ipsecrequest_reqid;
}
break;
default:
ipseclog((LOG_DEBUG, "%s: invalid level=%u\n",
__func__,
xisr->sadb_x_ipsecrequest_level));
key_freesp(&newsp);
*error = EINVAL;
return NULL;
}
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(isr->saidx.src)) {
ipseclog((LOG_DEBUG, "%s: invalid "
"request address length.\n",
__func__));
key_freesp(&newsp);
*error = EINVAL;
return NULL;
}
bcopy(paddr, &isr->saidx.src, paddr->sa_len);
paddr = (struct sockaddr *)((caddr_t)paddr +
paddr->sa_len);
/* validity check */
if (paddr->sa_len
> sizeof(isr->saidx.dst)) {
ipseclog((LOG_DEBUG, "%s: invalid "
"request address length.\n",
__func__));
key_freesp(&newsp);
*error = EINVAL;
return NULL;
}
/* AF family should match */
if (paddr->sa_family !=
isr->saidx.src.sa.sa_family) {
ipseclog((LOG_DEBUG, "%s: address "
"family doesn't match.\n",
__func__));
key_freesp(&newsp);
*error = EINVAL;
return (NULL);
}
bcopy(paddr, &isr->saidx.dst, paddr->sa_len);
} else {
/*
* Addresses for TUNNEL mode requests are
* mandatory.
*/
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
ipseclog((LOG_DEBUG, "%s: missing "
"request addresses.\n", __func__));
key_freesp(&newsp);
*error = EINVAL;
return (NULL);
}
}
tlen -= xisr->sadb_x_ipsecrequest_len;
/* validity check */
if (tlen < 0) {
ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n",
__func__));
key_freesp(&newsp);
*error = EINVAL;
return NULL;
}
xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr
+ xisr->sadb_x_ipsecrequest_len);
}
/* XXXAE: LARVAL SP */
if (newsp->tcount < 1) {
ipseclog((LOG_DEBUG, "%s: valid IPSEC transforms "
"not found.\n", __func__));
key_freesp(&newsp);
*error = EINVAL;
return (NULL);
}
}
break;
default:
ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
key_freesp(&newsp);
*error = EINVAL;
return NULL;
}
*error = 0;
return (newsp);
}
uint32_t
key_newreqid(void)
{
static uint32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
if (auto_reqid == ~0)
auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
else
auto_reqid++;
/* XXX should be unique check */
return (auto_reqid);
}
/*
* copy secpolicy struct to sadb_x_policy structure indicated.
*/
static struct mbuf *
key_sp2mbuf(struct secpolicy *sp)
{
struct mbuf *m;
size_t tlen;
tlen = key_getspreqmsglen(sp);
m = m_get2(tlen, M_NOWAIT, MT_DATA, 0);
if (m == NULL)
return (NULL);
m_align(m, tlen);
m->m_len = tlen;
if (key_sp2msg(sp, m->m_data, &tlen) != 0) {
m_freem(m);
return (NULL);
}
return (m);
}
int
key_sp2msg(struct secpolicy *sp, void *request, size_t *len)
{
struct sadb_x_ipsecrequest *xisr;
struct sadb_x_policy *xpl;
struct ipsecrequest *isr;
size_t xlen, ilen;
caddr_t p;
int error, i;
IPSEC_ASSERT(sp != NULL, ("null policy"));
xlen = sizeof(*xpl);
if (*len < xlen)
return (EINVAL);
error = 0;
bzero(request, *len);
xpl = (struct sadb_x_policy *)request;
xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
xpl->sadb_x_policy_type = sp->policy;
xpl->sadb_x_policy_dir = sp->spidx.dir;
xpl->sadb_x_policy_id = sp->id;
xpl->sadb_x_policy_priority = sp->priority;
switch (sp->state) {
case IPSEC_SPSTATE_IFNET:
xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_IFNET;
break;
case IPSEC_SPSTATE_PCB:
xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_PCB;
break;
default:
xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_GLOBAL;
}
/* if is the policy for ipsec ? */
if (sp->policy == IPSEC_POLICY_IPSEC) {
p = (caddr_t)xpl + sizeof(*xpl);
for (i = 0; i < sp->tcount; i++) {
isr = sp->req[i];
ilen = PFKEY_ALIGN8(sizeof(*xisr) +
isr->saidx.src.sa.sa_len +
isr->saidx.dst.sa.sa_len);
xlen += ilen;
if (xlen > *len) {
error = ENOBUFS;
/* Calculate needed size */
continue;
}
xisr = (struct sadb_x_ipsecrequest *)p;
xisr->sadb_x_ipsecrequest_len = ilen;
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.sa.sa_len);
p += isr->saidx.src.sa.sa_len;
bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len);
p += isr->saidx.dst.sa.sa_len;
}
}
xpl->sadb_x_policy_len = PFKEY_UNIT64(xlen);
if (error == 0)
*len = xlen;
else
*len = sizeof(*xpl);
return (error);
}
/* m will not be freed nor modified */
static struct mbuf *
key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp,
int ndeep, int nitem, ...)
{
va_list ap;
int idx;
int i;
struct mbuf *result = NULL, *n;
int len;
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
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));
IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len));
MGETHDR(n, M_NOWAIT, 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 = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (n == NULL)
goto fail;
m_align(n, len);
n->m_len = len;
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_NOWAIT);
}
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:
m_freem(result);
va_end(ap);
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.
*
* XXXAE: serialize this in PF_KEY to avoid races.
* m will always be freed.
*/
static int
key_spdadd(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
struct secpolicyindex spidx;
struct sadb_address *src0, *dst0;
struct sadb_x_policy *xpl0, *xpl;
struct sadb_lifetime *lft = NULL;
struct secpolicy *newsp;
int error;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: missing required header.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n", __func__));
return key_senderror(so, m, EINVAL);
}
if (!SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD)) {
if (SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_HARD)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
}
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];
/* check the direciton */
switch (xpl0->sadb_x_policy_dir) {
case IPSEC_DIR_INBOUND:
case IPSEC_DIR_OUTBOUND:
break;
default:
ipseclog((LOG_DEBUG, "%s: invalid SP direction.\n", __func__));
return key_senderror(so, m, EINVAL);
}
/* key_spdadd() accepts DISCARD, NONE and IPSEC. */
if (xpl0->sadb_x_policy_type != IPSEC_POLICY_DISCARD &&
xpl0->sadb_x_policy_type != IPSEC_POLICY_NONE &&
xpl0->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
return key_senderror(so, m, EINVAL);
}
/* policy requests are mandatory when action is ipsec. */
if (xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) {
ipseclog((LOG_DEBUG,
"%s: policy requests required.\n", __func__));
return key_senderror(so, m, EINVAL);
}
error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
(struct sockaddr *)(dst0 + 1));
if (error != 0 ||
src0->sadb_address_proto != dst0->sadb_address_proto) {
ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
return key_senderror(so, m, error);
}
/* make secindex */
KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
src0 + 1,
dst0 + 1,
src0->sadb_address_prefixlen,
dst0->sadb_address_prefixlen,
src0->sadb_address_proto,
&spidx);
/* Checking there is SP already or not. */
newsp = key_getsp(&spidx);
if (newsp != NULL) {
if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
KEYDBG(KEY_STAMP,
printf("%s: unlink SP(%p) for SPDUPDATE\n",
__func__, newsp));
KEYDBG(KEY_DATA, kdebug_secpolicy(newsp));
key_unlink(newsp);
key_freesp(&newsp);
} else {
key_freesp(&newsp);
ipseclog((LOG_DEBUG, "%s: a SP entry exists already.",
__func__));
return (key_senderror(so, m, EEXIST));
}
}
/* allocate new SP entry */
if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) {
return key_senderror(so, m, error);
}
newsp->lastused = newsp->created = time_second;
newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0;
newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0;
bcopy(&spidx, &newsp->spidx, sizeof(spidx));
/* XXXAE: there is race between key_getsp() and key_insertsp() */
SPTREE_WLOCK();
if ((newsp->id = key_getnewspid()) == 0) {
SPTREE_WUNLOCK();
key_freesp(&newsp);
return key_senderror(so, m, ENOBUFS);
}
key_insertsp(newsp);
SPTREE_WUNLOCK();
KEYDBG(KEY_STAMP,
printf("%s: SP(%p)\n", __func__, newsp));
KEYDBG(KEY_DATA, kdebug_secpolicy(newsp));
{
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);
}
}
/*
* get new policy id.
* OUT:
* 0: failure.
* others: success.
*/
static uint32_t
key_getnewspid(void)
{
struct secpolicy *sp;
uint32_t newid = 0;
int count = V_key_spi_trycnt; /* XXX */
SPTREE_WLOCK_ASSERT();
while (count--) {
if (V_policy_id == ~0) /* overflowed */
newid = V_policy_id = 1;
else
newid = ++V_policy_id;
LIST_FOREACH(sp, SPHASH_HASH(newid), idhash) {
if (sp->id == newid)
break;
}
if (sp == NULL)
break;
}
if (count == 0 || newid == 0) {
ipseclog((LOG_DEBUG, "%s: failed to allocate policy id.\n",
__func__));
return (0);
}
return (newid);
}
/*
* 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 direction of policy.
*
* m will always be freed.
*/
static int
key_spddelete(struct socket *so, struct mbuf *m,
const struct sadb_msghdr *mhp)
{
struct secpolicyindex spidx;
struct sadb_address *src0, *dst0;
struct sadb_x_policy *xpl0;
struct secpolicy *sp;
IPSEC_ASSERT(so != NULL, ("null so"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: missing required header.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n", __func__));
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];
/* check the direciton */
switch (xpl0->sadb_x_policy_dir) {
case IPSEC_DIR_INBOUND:
case IPSEC_DIR_OUTBOUND:
break;
default:
ipseclog((LOG_DEBUG, "%s: invalid SP direction.\n", __func__));
return key_senderror(so, m, EINVAL);
}
/* Only DISCARD, NONE and IPSEC are allowed */
if (xpl0->sadb_x_policy_type != IPSEC_POLICY_DISCARD &&
xpl0->sadb_x_policy_type != IPSEC_POLICY_NONE &&
xpl0->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
return key_senderror(so, m, EINVAL);
}
if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
(struct sockaddr *)(dst0 + 1)) != 0 ||
src0->sadb_address_proto != dst0->sadb_address_proto) {
ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
return key_senderror(so, m, EINVAL);
}
/* make secindex */
KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
src0 + 1,
dst0 + 1,
src0->sadb_address_prefixlen,
dst0->sadb_address_prefixlen,
src0->sadb_address_proto,
&spidx);
/* Is there SP in SPD ? */
if ((sp = key_getsp(&spidx)) == NULL) {
ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__));
return key_senderror(so, m, EINVAL);
}
/* save policy id to buffer to be returned. */
xpl0->sadb_x_policy_id = sp->id;
KEYDBG(KEY_STAMP,
printf("%s: SP(%p)\n", __func__, sp));
KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
key_unlink(sp);
key_freesp(&sp);
{
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 direction of policy.
*
* m will always be freed.
*/
static int
key_spddelete2(struct socket *so, struct mbuf *m,
const struct sadb_msghdr *mhp)
{
struct secpolicy *sp;
uint32_t id;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
if (SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY) ||
SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
__func__));
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, "%s: no SP found for id %u.\n",
__func__, id));
return key_senderror(so, m, EINVAL);
}
KEYDBG(KEY_STAMP,
printf("%s: SP(%p)\n", __func__, sp));
KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
key_unlink(sp);
if (sp->state != IPSEC_SPSTATE_DEAD) {
ipseclog((LOG_DEBUG, "%s: failed to delete SP with id %u.\n",
__func__, id));
key_freesp(&sp);
return (key_senderror(so, m, EACCES));
}
key_freesp(&sp);
{
struct mbuf *n, *nn;
struct sadb_msg *newmsg;
int off, len;
/* create new sadb_msg to reply. */
len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
MGETHDR(n, M_NOWAIT, MT_DATA);
if (n && len > MHLEN) {
if (!(MCLGET(n, M_NOWAIT))) {
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));
IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)",
off, len));
n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY],
mhp->extlen[SADB_X_EXT_POLICY], M_NOWAIT);
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(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
struct secpolicy *sp;
struct mbuf *n;
uint32_t id;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
if (SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY) ||
SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
__func__));
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, "%s: no SP found for id %u.\n",
__func__, id));
return key_senderror(so, m, ENOENT);
}
n = key_setdumpsp(sp, SADB_X_SPDGET, mhp->msg->sadb_msg_seq,
mhp->msg->sadb_msg_pid);
key_freesp(&sp);
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 occurred,
* 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(struct secpolicy *sp)
{
struct mbuf *result = NULL, *m;
struct secspacq *newspacq;
IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
IPSEC_ASSERT(sp->req == NULL, ("policy exists"));
IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
("policy not IPSEC %u", sp->policy));
/* Get an entry to check whether sent message or not. */
newspacq = key_getspacq(&sp->spidx);
if (newspacq != NULL) {
if (V_key_blockacq_count < newspacq->count) {
/* reset counter and do send message. */
newspacq->count = 0;
} else {
/* increment counter and do nothing. */
newspacq->count++;
SPACQ_UNLOCK();
return (0);
}
SPACQ_UNLOCK();
} else {
/* make new entry for blocking to send SADB_ACQUIRE. */
newspacq = key_newspacq(&sp->spidx);
if (newspacq == NULL)
return ENOBUFS;
}
/* create new sadb_msg to reply. */
m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0);
if (!m)
return ENOBUFS;
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, m, KEY_SENDUP_REGISTERED);
}
/*
* 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(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
struct secpolicy_queue drainq;
struct sadb_msg *newmsg;
struct secpolicy *sp, *nextsp;
u_int dir;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg)))
return key_senderror(so, m, EINVAL);
TAILQ_INIT(&drainq);
SPTREE_WLOCK();
for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
TAILQ_CONCAT(&drainq, &V_sptree[dir], chain);
}
/*
* We need to set state to DEAD for each policy to be sure,
* that another thread won't try to unlink it.
* Also remove SP from sphash.
*/
TAILQ_FOREACH(sp, &drainq, chain) {
sp->state = IPSEC_SPSTATE_DEAD;
LIST_REMOVE(sp, idhash);
}
V_sp_genid++;
SPTREE_WUNLOCK();
sp = TAILQ_FIRST(&drainq);
while (sp != NULL) {
nextsp = TAILQ_NEXT(sp, chain);
key_freesp(&sp);
sp = nextsp;
}
if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
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);
}
static uint8_t
key_satype2scopemask(uint8_t satype)
{
if (satype == IPSEC_POLICYSCOPE_ANY)
return (0xff);
return (satype);
}
/*
* SADB_SPDDUMP processing
* receive
* <base>
* from the user, and dump all SP leaves and send,
* <base> .....
* to the ikmpd.
*
* NOTE:
* sadb_msg_satype is considered as mask of policy scopes.
* m will always be freed.
*/
static int
key_spddump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
SPTREE_RLOCK_TRACKER;
struct secpolicy *sp;
struct mbuf *n;
int cnt;
u_int dir, scope;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
/* search SPD entry and get buffer size. */
cnt = 0;
scope = key_satype2scopemask(mhp->msg->sadb_msg_satype);
SPTREE_RLOCK();
for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
if (scope & IPSEC_POLICYSCOPE_GLOBAL) {
TAILQ_FOREACH(sp, &V_sptree[dir], chain)
cnt++;
}
if (scope & IPSEC_POLICYSCOPE_IFNET) {
TAILQ_FOREACH(sp, &V_sptree_ifnet[dir], chain)
cnt++;
}
}
if (cnt == 0) {
SPTREE_RUNLOCK();
return key_senderror(so, m, ENOENT);
}
for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
if (scope & IPSEC_POLICYSCOPE_GLOBAL) {
TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
--cnt;
n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
mhp->msg->sadb_msg_pid);
if (n != NULL)
key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
}
}
if (scope & IPSEC_POLICYSCOPE_IFNET) {
TAILQ_FOREACH(sp, &V_sptree_ifnet[dir], chain) {
--cnt;
n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
mhp->msg->sadb_msg_pid);
if (n != NULL)
key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
}
}
}
SPTREE_RUNLOCK();
m_freem(m);
return (0);
}
static struct mbuf *
key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq,
u_int32_t pid)
{
struct mbuf *result = NULL, *m;
struct seclifetime lt;
m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt);
if (!m)
goto fail;
result = m;
m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
&sp->spidx.src.sa, sp->spidx.prefs,
sp->spidx.ul_proto);
if (!m)
goto fail;
m_cat(result, m);
m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
&sp->spidx.dst.sa, sp->spidx.prefd,
sp->spidx.ul_proto);
if (!m)
goto fail;
m_cat(result, m);
m = key_sp2mbuf(sp);
if (!m)
goto fail;
m_cat(result, m);
if(sp->lifetime){
lt.addtime=sp->created;
lt.usetime= sp->lastused;
m = key_setlifetime(&lt, SADB_EXT_LIFETIME_CURRENT);
if (!m)
goto fail;
m_cat(result, m);
lt.addtime=sp->lifetime;
lt.usetime= sp->validtime;
m = key_setlifetime(&lt, SADB_EXT_LIFETIME_HARD);
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 size_t
key_getspreqmsglen(struct secpolicy *sp)
{
size_t tlen, len;
int i;
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 */
for (i = 0; i < sp->tcount; i++) {
len = sizeof(struct sadb_x_ipsecrequest)
+ sp->req[i]->saidx.src.sa.sa_len
+ sp->req[i]->saidx.dst.sa.sa_len;
tlen += PFKEY_ALIGN8(len);
}
return (tlen);
}
/*
* SADB_SPDEXPIRE processing
* send
* <base, address(SD), lifetime(CH), policy>
* to KMD by PF_KEY.
*
* OUT: 0 : succeed
* others : error number
*/
static int
key_spdexpire(struct secpolicy *sp)
{
struct sadb_lifetime *lt;
struct mbuf *result = NULL, *m;
int len, error = -1;
IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
KEYDBG(KEY_STAMP,
printf("%s: SP(%p)\n", __func__, sp));
KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
/* 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 = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (m == NULL) {
error = ENOBUFS;
goto fail;
}
m_align(m, len);
m->m_len = len;
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 */
m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
&sp->spidx.src.sa,
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,
&sp->spidx.dst.sa,
sp->spidx.prefd, sp->spidx.ul_proto);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
/* set secpolicy */
m = key_sp2mbuf(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);
return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
fail:
if (result)
m_freem(result);
return error;
}
/* %%% SAD management */
/*
* allocating and initialize new SA head.
* OUT: NULL : failure due to the lack of memory.
* others : pointer to new SA head.
*/
static struct secashead *
key_newsah(struct secasindex *saidx)
{
struct secashead *sah;
sah = malloc(sizeof(struct secashead), M_IPSEC_SAH,
M_NOWAIT | M_ZERO);
if (sah == NULL) {
PFKEYSTAT_INC(in_nomem);
return (NULL);
}
TAILQ_INIT(&sah->savtree_larval);
TAILQ_INIT(&sah->savtree_alive);
sah->saidx = *saidx;
sah->state = SADB_SASTATE_DEAD;
SAH_INITREF(sah);
KEYDBG(KEY_STAMP,
printf("%s: SAH(%p)\n", __func__, sah));
KEYDBG(KEY_DATA, kdebug_secash(sah, NULL));
return (sah);
}
static void
key_freesah(struct secashead **psah)
{
struct secashead *sah = *psah;
if (SAH_DELREF(sah) == 0)
return;
KEYDBG(KEY_STAMP,
printf("%s: last reference to SAH(%p)\n", __func__, sah));
KEYDBG(KEY_DATA, kdebug_secash(sah, NULL));
*psah = NULL;
key_delsah(sah);
}
static void
key_delsah(struct secashead *sah)
{
IPSEC_ASSERT(sah != NULL, ("NULL sah"));
IPSEC_ASSERT(sah->state == SADB_SASTATE_DEAD,
("Attempt to free non DEAD SAH %p", sah));
IPSEC_ASSERT(TAILQ_EMPTY(&sah->savtree_larval),
("Attempt to free SAH %p with LARVAL SA", sah));
IPSEC_ASSERT(TAILQ_EMPTY(&sah->savtree_alive),
("Attempt to free SAH %p with ALIVE SA", sah));
free(sah, M_IPSEC_SAH);
}
/*
* allocating a new SA for key_add() and key_getspi() call,
* and copy the values of mhp into new buffer.
* When SAD message type is SADB_GETSPI set SA state to LARVAL.
* For SADB_ADD create and initialize SA with MATURE state.
* OUT: NULL : fail
* others : pointer to new secasvar.
*/
static struct secasvar *
key_newsav(const struct sadb_msghdr *mhp, struct secasindex *saidx,
uint32_t spi, int *errp)
{
struct secashead *sah;
struct secasvar *sav;
int isnew;
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
IPSEC_ASSERT(mhp->msg->sadb_msg_type == SADB_GETSPI ||
mhp->msg->sadb_msg_type == SADB_ADD, ("wrong message type"));
sav = NULL;
sah = NULL;
/* check SPI value */
switch (saidx->proto) {
case IPPROTO_ESP:
case IPPROTO_AH:
/*
* RFC 4302, 2.4. Security Parameters Index (SPI), SPI values
* 1-255 reserved by IANA for future use,
* 0 for implementation specific, local use.
*/
if (ntohl(spi) <= 255) {
ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n",
__func__, ntohl(spi)));
*errp = EINVAL;
goto done;
}
break;
}
sav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT | M_ZERO);
if (sav == NULL) {
*errp = ENOBUFS;
goto done;
}
sav->lock = malloc(sizeof(struct mtx), M_IPSEC_MISC,
M_NOWAIT | M_ZERO);
if (sav->lock == NULL) {
*errp = ENOBUFS;
goto done;
}
mtx_init(sav->lock, "ipsec association", NULL, MTX_DEF);
sav->lft_c = uma_zalloc(V_key_lft_zone, M_NOWAIT);
if (sav->lft_c == NULL) {
*errp = ENOBUFS;
goto done;
}
counter_u64_zero(sav->lft_c_allocations);
counter_u64_zero(sav->lft_c_bytes);
sav->spi = spi;
sav->seq = mhp->msg->sadb_msg_seq;
sav->state = SADB_SASTATE_LARVAL;
sav->pid = (pid_t)mhp->msg->sadb_msg_pid;
SAV_INITREF(sav);
again:
sah = key_getsah(saidx);
if (sah == NULL) {
/* create a new SA index */
sah = key_newsah(saidx);
if (sah == NULL) {
ipseclog((LOG_DEBUG,
"%s: No more memory.\n", __func__));
*errp = ENOBUFS;
goto done;
}
isnew = 1;
} else
isnew = 0;
sav->sah = sah;
if (mhp->msg->sadb_msg_type == SADB_GETSPI) {
sav->created = time_second;
} else if (sav->state == SADB_SASTATE_LARVAL) {
/*
* Do not call key_setsaval() second time in case
* of `goto again`. We will have MATURE state.
*/
*errp = key_setsaval(sav, mhp);
if (*errp != 0)
goto done;
sav->state = SADB_SASTATE_MATURE;
}
SAHTREE_WLOCK();
/*
* Check that existing SAH wasn't unlinked.
* Since we didn't hold the SAHTREE lock, it is possible,
* that callout handler or key_flush() or key_delete() could
* unlink this SAH.
*/
if (isnew == 0 && sah->state == SADB_SASTATE_DEAD) {
SAHTREE_WUNLOCK();
key_freesah(&sah); /* reference from key_getsah() */
goto again;
}
if (isnew != 0) {
/*
* Add new SAH into SADB.
*
* XXXAE: we can serialize key_add and key_getspi calls, so
* several threads will not fight in the race.
* Otherwise we should check under SAHTREE lock, that this
* SAH would not added twice.
*/
TAILQ_INSERT_HEAD(&V_sahtree, sah, chain);
/* Add new SAH into hash by addresses */
LIST_INSERT_HEAD(SAHADDRHASH_HASH(saidx), sah, addrhash);
/* Now we are linked in the chain */
sah->state = SADB_SASTATE_MATURE;
/*
* SAV references this new SAH.
* In case of existing SAH we reuse reference
* from key_getsah().
*/
SAH_ADDREF(sah);
}
/* Link SAV with SAH */
if (sav->state == SADB_SASTATE_MATURE)
TAILQ_INSERT_HEAD(&sah->savtree_alive, sav, chain);
else
TAILQ_INSERT_HEAD(&sah->savtree_larval, sav, chain);
/* Add SAV into SPI hash */
LIST_INSERT_HEAD(SAVHASH_HASH(sav->spi), sav, spihash);
SAHTREE_WUNLOCK();
*errp = 0; /* success */
done:
if (*errp != 0) {
if (sav != NULL) {
if (sav->lock != NULL) {
mtx_destroy(sav->lock);
free(sav->lock, M_IPSEC_MISC);
}
if (sav->lft_c != NULL)
uma_zfree(V_key_lft_zone, sav->lft_c);
free(sav, M_IPSEC_SA), sav = NULL;
}
if (sah != NULL)
key_freesah(&sah);
if (*errp == ENOBUFS) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n",
__func__));
PFKEYSTAT_INC(in_nomem);
}
}
return (sav);
}
/*
* free() SA variable entry.
*/
static void
key_cleansav(struct secasvar *sav)
{
if (sav->natt != NULL) {
free(sav->natt, M_IPSEC_MISC);
sav->natt = NULL;
}
if (sav->flags & SADB_X_EXT_F_CLONED)
return;
/*
* Cleanup xform state. Note that zeroize'ing causes the
* keys to be cleared; otherwise we must do it ourself.
*/
if (sav->tdb_xform != NULL) {
sav->tdb_xform->xf_zeroize(sav);
sav->tdb_xform = NULL;
} else {
if (sav->key_auth != NULL)
bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
if (sav->key_enc != NULL)
bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc));
}
if (sav->key_auth != NULL) {
if (sav->key_auth->key_data != NULL)
free(sav->key_auth->key_data, M_IPSEC_MISC);
free(sav->key_auth, M_IPSEC_MISC);
sav->key_auth = NULL;
}
if (sav->key_enc != NULL) {
if (sav->key_enc->key_data != NULL)
free(sav->key_enc->key_data, M_IPSEC_MISC);
free(sav->key_enc, M_IPSEC_MISC);
sav->key_enc = NULL;
}
if (sav->replay != NULL) {
if (sav->replay->bitmap != NULL)
free(sav->replay->bitmap, M_IPSEC_MISC);
free(sav->replay, M_IPSEC_MISC);
sav->replay = NULL;
}
if (sav->lft_h != NULL) {
free(sav->lft_h, M_IPSEC_MISC);
sav->lft_h = NULL;
}
if (sav->lft_s != NULL) {
free(sav->lft_s, M_IPSEC_MISC);
sav->lft_s = NULL;
}
}
/*
* free() SA variable entry.
*/
static void
key_delsav(struct secasvar *sav)
{
IPSEC_ASSERT(sav != NULL, ("null sav"));
IPSEC_ASSERT(sav->state == SADB_SASTATE_DEAD,
("attempt to free non DEAD SA %p", sav));
IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0",
sav->refcnt));
/*
* SA must be unlinked from the chain and hashtbl.
* If SA was cloned, we leave all fields untouched,
* except NAT-T config.
*/
key_cleansav(sav);
if ((sav->flags & SADB_X_EXT_F_CLONED) == 0) {
mtx_destroy(sav->lock);
free(sav->lock, M_IPSEC_MISC);
uma_zfree(V_key_lft_zone, sav->lft_c);
}
free(sav, M_IPSEC_SA);
}
/*
* search SAH.
* OUT:
* NULL : not found
* others : found, referenced pointer to a SAH.
*/
static struct secashead *
key_getsah(struct secasindex *saidx)
{
SAHTREE_RLOCK_TRACKER;
struct secashead *sah;
SAHTREE_RLOCK();
LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID) != 0) {
SAH_ADDREF(sah);
break;
}
}
SAHTREE_RUNLOCK();
return (sah);
}
/*
* Check not to be duplicated SPI.
* OUT:
* 0 : not found
* 1 : found SA with given SPI.
*/
static int
key_checkspidup(uint32_t spi)
{
SAHTREE_RLOCK_TRACKER;
struct secasvar *sav;
/* Assume SPI is in network byte order */
SAHTREE_RLOCK();
LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
if (sav->spi == spi)
break;
}
SAHTREE_RUNLOCK();
return (sav != NULL);
}
/*
* Search SA by SPI.
* OUT:
* NULL : not found
* others : found, referenced pointer to a SA.
*/
static struct secasvar *
key_getsavbyspi(uint32_t spi)
{
SAHTREE_RLOCK_TRACKER;
struct secasvar *sav;
/* Assume SPI is in network byte order */
SAHTREE_RLOCK();
LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
if (sav->spi != spi)
continue;
SAV_ADDREF(sav);
break;
}
SAHTREE_RUNLOCK();
return (sav);
}
static int
key_updatelifetimes(struct secasvar *sav, const struct sadb_msghdr *mhp)
{
struct seclifetime *lft_h, *lft_s, *tmp;
/* Lifetime extension is optional, check that it is present. */
if (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) {
/*
* In case of SADB_UPDATE we may need to change
* existing lifetimes.
*/
if (sav->state == SADB_SASTATE_MATURE) {
lft_h = lft_s = NULL;
goto reset;
}
return (0);
}
/* Both HARD and SOFT extensions must present */
if ((SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
!SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
(SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
!SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
ipseclog((LOG_DEBUG,
"%s: invalid message: missing required header.\n",
__func__));
return (EINVAL);
}
if (SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_HARD) ||
SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_SOFT)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n", __func__));
return (EINVAL);
}
lft_h = key_dup_lifemsg((const struct sadb_lifetime *)
mhp->ext[SADB_EXT_LIFETIME_HARD], M_IPSEC_MISC);
if (lft_h == NULL) {
PFKEYSTAT_INC(in_nomem);
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
return (ENOBUFS);
}
lft_s = key_dup_lifemsg((const struct sadb_lifetime *)
mhp->ext[SADB_EXT_LIFETIME_SOFT], M_IPSEC_MISC);
if (lft_s == NULL) {
PFKEYSTAT_INC(in_nomem);
free(lft_h, M_IPSEC_MISC);
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
return (ENOBUFS);
}
reset:
if (sav->state != SADB_SASTATE_LARVAL) {
/*
* key_update() holds reference to this SA,
* so it won't be deleted in meanwhile.
*/
SECASVAR_LOCK(sav);
tmp = sav->lft_h;
sav->lft_h = lft_h;
lft_h = tmp;
tmp = sav->lft_s;
sav->lft_s = lft_s;
lft_s = tmp;
SECASVAR_UNLOCK(sav);
if (lft_h != NULL)
free(lft_h, M_IPSEC_MISC);
if (lft_s != NULL)
free(lft_s, M_IPSEC_MISC);
return (0);
}
/* We can update lifetime without holding a lock */
IPSEC_ASSERT(sav->lft_h == NULL, ("lft_h is already initialized\n"));
IPSEC_ASSERT(sav->lft_s == NULL, ("lft_s is already initialized\n"));
sav->lft_h = lft_h;
sav->lft_s = lft_s;
return (0);
}
/*
* copy SA values from PF_KEY message except *SPI, SEQ, PID and TYPE*.
* You must update these if need. Expects only LARVAL SAs.
* OUT: 0: success.
* !0: failure.
*/
static int
key_setsaval(struct secasvar *sav, const struct sadb_msghdr *mhp)
{
const struct sadb_sa *sa0;
const struct sadb_key *key0;
uint32_t replay;
size_t len;
int error;
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
IPSEC_ASSERT(sav->state == SADB_SASTATE_LARVAL,
("Attempt to update non LARVAL SA"));
/* XXX rewrite */
error = key_setident(sav->sah, mhp);
if (error != 0)
goto fail;
/* SA */
if (!SADB_CHECKHDR(mhp, SADB_EXT_SA)) {
if (SADB_CHECKLEN(mhp, SADB_EXT_SA)) {
error = EINVAL;
goto fail;
}
sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
sav->alg_auth = sa0->sadb_sa_auth;
sav->alg_enc = sa0->sadb_sa_encrypt;
sav->flags = sa0->sadb_sa_flags;
if ((sav->flags & SADB_KEY_FLAGS_MAX) != sav->flags) {
ipseclog((LOG_DEBUG,
"%s: invalid sa_flags 0x%08x.\n", __func__,
sav->flags));
error = EINVAL;
goto fail;
}
/* Optional replay window */
replay = 0;
if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0)
replay = sa0->sadb_sa_replay;
if (!SADB_CHECKHDR(mhp, SADB_X_EXT_SA_REPLAY)) {
if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA_REPLAY)) {
error = EINVAL;
goto fail;
}
replay = ((const struct sadb_x_sa_replay *)
mhp->ext[SADB_X_EXT_SA_REPLAY])->sadb_x_sa_replay_replay;
if (replay > UINT32_MAX - 32) {
ipseclog((LOG_DEBUG,
"%s: replay window too big.\n", __func__));
error = EINVAL;
goto fail;
}
replay = (replay + 7) >> 3;
}
sav->replay = malloc(sizeof(struct secreplay), M_IPSEC_MISC,
M_NOWAIT | M_ZERO);
if (sav->replay == NULL) {
PFKEYSTAT_INC(in_nomem);
ipseclog((LOG_DEBUG, "%s: No more memory.\n",
__func__));
error = ENOBUFS;
goto fail;
}
if (replay != 0) {
/* number of 32b blocks to be allocated */
uint32_t bitmap_size;
/* RFC 6479:
* - the allocated replay window size must be
* a power of two.
* - use an extra 32b block as a redundant window.
*/
bitmap_size = 1;
while (replay + 4 > bitmap_size)
bitmap_size <<= 1;
bitmap_size = bitmap_size / 4;
sav->replay->bitmap = malloc(
bitmap_size * sizeof(uint32_t), M_IPSEC_MISC,
M_NOWAIT | M_ZERO);
if (sav->replay->bitmap == NULL) {
PFKEYSTAT_INC(in_nomem);
ipseclog((LOG_DEBUG, "%s: No more memory.\n",
__func__));
error = ENOBUFS;
goto fail;
}
sav->replay->bitmap_size = bitmap_size;
sav->replay->wsize = replay;
}
}
/* Authentication keys */
if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH)) {
if (SADB_CHECKLEN(mhp, SADB_EXT_KEY_AUTH)) {
error = EINVAL;
goto fail;
}
error = 0;
key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH];
len = mhp->extlen[SADB_EXT_KEY_AUTH];
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, "%s: invalid key_auth values.\n",
__func__));
goto fail;
}
sav->key_auth = key_dup_keymsg(key0, len, M_IPSEC_MISC);
if (sav->key_auth == NULL ) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n",
__func__));
PFKEYSTAT_INC(in_nomem);
error = ENOBUFS;
goto fail;
}
}
/* Encryption key */
if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT)) {
if (SADB_CHECKLEN(mhp, SADB_EXT_KEY_ENCRYPT)) {
error = EINVAL;
goto fail;
}
error = 0;
key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT];
len = mhp->extlen[SADB_EXT_KEY_ENCRYPT];
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 = key_dup_keymsg(key0, len, M_IPSEC_MISC);
if (sav->key_enc == NULL) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n",
__func__));
PFKEYSTAT_INC(in_nomem);
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, "%s: invalid key_enc value.\n",
__func__));
goto fail;
}
}
/* set iv */
sav->ivlen = 0;
switch (mhp->msg->sadb_msg_satype) {
case SADB_SATYPE_AH:
if (sav->flags & SADB_X_EXT_DERIV) {
ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
"given to AH SA.\n", __func__));
error = EINVAL;
goto fail;
}
if (sav->alg_enc != SADB_EALG_NONE) {
ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
"mismated.\n", __func__));
error = EINVAL;
goto fail;
}
error = xform_init(sav, XF_AH);
break;
case SADB_SATYPE_ESP:
if ((sav->flags & (SADB_X_EXT_OLD | SADB_X_EXT_DERIV)) ==
(SADB_X_EXT_OLD | SADB_X_EXT_DERIV)) {
ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
"given to old-esp.\n", __func__));
error = EINVAL;
goto fail;
}
error = xform_init(sav, XF_ESP);
break;
case SADB_X_SATYPE_IPCOMP:
if (sav->alg_auth != SADB_AALG_NONE) {
ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
"mismated.\n", __func__));
error = EINVAL;
goto fail;
}
if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 &&
ntohl(sav->spi) >= 0x10000) {
ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n",
__func__));
error = EINVAL;
goto fail;
}
error = xform_init(sav, XF_IPCOMP);
break;
case SADB_X_SATYPE_TCPSIGNATURE:
if (sav->alg_enc != SADB_EALG_NONE) {
ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
"mismated.\n", __func__));
error = EINVAL;
goto fail;
}
error = xform_init(sav, XF_TCPSIGNATURE);
break;
default:
ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__));
error = EPROTONOSUPPORT;
goto fail;
}
if (error) {
ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n",
__func__, mhp->msg->sadb_msg_satype));
goto fail;
}
/* Handle NAT-T headers */
error = key_setnatt(sav, mhp);
if (error != 0)
goto fail;
/* Initialize lifetime for CURRENT */
sav->firstused = 0;
sav->created = time_second;
/* lifetimes for HARD and SOFT */
error = key_updatelifetimes(sav, mhp);
if (error == 0)
return (0);
fail:
key_cleansav(sav);
return (error);
}
/*
* subroutine for SADB_GET and SADB_DUMP.
*/
static struct mbuf *
key_setdumpsa(struct secasvar *sav, uint8_t type, uint8_t satype,
uint32_t seq, uint32_t pid)
{
struct seclifetime lft_c;
struct mbuf *result = NULL, *tres = NULL, *m;
int i, dumporder[] = {
SADB_EXT_SA, SADB_X_EXT_SA2, SADB_X_EXT_SA_REPLAY,
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,
SADB_X_EXT_NAT_T_TYPE,
SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT,
SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR,
SADB_X_EXT_NAT_T_FRAG,
};
uint32_t replay_count;
m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt);
if (m == NULL)
goto fail;
result = m;
for (i = nitems(dumporder) - 1; i >= 0; i--) {
m = NULL;
switch (dumporder[i]) {
case SADB_EXT_SA:
m = key_setsadbsa(sav);
if (!m)
goto fail;
break;
case SADB_X_EXT_SA2:
SECASVAR_LOCK(sav);
replay_count = sav->replay ? sav->replay->count : 0;
SECASVAR_UNLOCK(sav);
m = key_setsadbxsa2(sav->sah->saidx.mode, replay_count,
sav->sah->saidx.reqid);
if (!m)
goto fail;
break;
case SADB_X_EXT_SA_REPLAY:
if (sav->replay == NULL ||
sav->replay->wsize <= UINT8_MAX)
continue;
m = key_setsadbxsareplay(sav->replay->wsize);
if (!m)
goto fail;
break;
case SADB_EXT_ADDRESS_SRC:
m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
&sav->sah->saidx.src.sa,
FULLMASK, IPSEC_ULPROTO_ANY);
if (!m)
goto fail;
break;
case SADB_EXT_ADDRESS_DST:
m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
&sav->sah->saidx.dst.sa,
FULLMASK, IPSEC_ULPROTO_ANY);
if (!m)
goto fail;
break;
case SADB_EXT_KEY_AUTH:
if (!sav->key_auth)
continue;
m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH);
if (!m)
goto fail;
break;
case SADB_EXT_KEY_ENCRYPT:
if (!sav->key_enc)
continue;
m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT);
if (!m)
goto fail;
break;
case SADB_EXT_LIFETIME_CURRENT:
lft_c.addtime = sav->created;
lft_c.allocations = (uint32_t)counter_u64_fetch(
sav->lft_c_allocations);
lft_c.bytes = counter_u64_fetch(sav->lft_c_bytes);
lft_c.usetime = sav->firstused;
m = key_setlifetime(&lft_c, SADB_EXT_LIFETIME_CURRENT);
if (!m)
goto fail;
break;
case SADB_EXT_LIFETIME_HARD:
if (!sav->lft_h)
continue;
m = key_setlifetime(sav->lft_h,
SADB_EXT_LIFETIME_HARD);
if (!m)
goto fail;
break;
case SADB_EXT_LIFETIME_SOFT:
if (!sav->lft_s)
continue;
m = key_setlifetime(sav->lft_s,
SADB_EXT_LIFETIME_SOFT);
if (!m)
goto fail;
break;
case SADB_X_EXT_NAT_T_TYPE:
if (sav->natt == NULL)
continue;
m = key_setsadbxtype(UDP_ENCAP_ESPINUDP);
if (!m)
goto fail;
break;
case SADB_X_EXT_NAT_T_DPORT:
if (sav->natt == NULL)
continue;
m = key_setsadbxport(sav->natt->dport,
SADB_X_EXT_NAT_T_DPORT);
if (!m)
goto fail;
break;
case SADB_X_EXT_NAT_T_SPORT:
if (sav->natt == NULL)
continue;
m = key_setsadbxport(sav->natt->sport,
SADB_X_EXT_NAT_T_SPORT);
if (!m)
goto fail;
break;
case SADB_X_EXT_NAT_T_OAI:
if (sav->natt == NULL ||
(sav->natt->flags & IPSEC_NATT_F_OAI) == 0)
continue;
m = key_setsadbaddr(SADB_X_EXT_NAT_T_OAI,
&sav->natt->oai.sa, FULLMASK, IPSEC_ULPROTO_ANY);
if (!m)
goto fail;
break;
case SADB_X_EXT_NAT_T_OAR:
if (sav->natt == NULL ||
(sav->natt->flags & IPSEC_NATT_F_OAR) == 0)
continue;
m = key_setsadbaddr(SADB_X_EXT_NAT_T_OAR,
&sav->natt->oar.sa, FULLMASK, IPSEC_ULPROTO_ANY);
if (!m)
goto fail;
break;
case SADB_X_EXT_NAT_T_FRAG:
/* We do not (yet) support those. */
continue;
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)
goto fail;
if (tres)
m_cat(m, tres);
tres = m;
}
m_cat(result, tres);
tres = NULL;
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(u_int8_t type, u_int16_t tlen, u_int8_t satype, 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_NOWAIT, MT_DATA);
if (m && len > MHLEN) {
if (!(MCLGET(m, M_NOWAIT))) {
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(struct secasvar *sav)
{
struct mbuf *m;
struct sadb_sa *p;
int len;
len = PFKEY_ALIGN8(sizeof(struct sadb_sa));
m = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (m == NULL)
return (NULL);
m_align(m, len);
m->m_len = len;
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 ?
(sav->replay->wsize > UINT8_MAX ? UINT8_MAX :
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 & SADB_KEY_FLAGS_MAX;
return (m);
}
/*
* set data into sadb_address.
*/
static struct mbuf *
key_setsadbaddr(u_int16_t exttype, const 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 = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (m == NULL)
return (NULL);
m_align(m, len);
m->m_len = len;
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;
}
/*
* set data into sadb_x_sa2.
*/
static struct mbuf *
key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid)
{
struct mbuf *m;
struct sadb_x_sa2 *p;
size_t len;
len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2));
m = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (m == NULL)
return (NULL);
m_align(m, len);
m->m_len = len;
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_x_sa_replay.
*/
static struct mbuf *
key_setsadbxsareplay(u_int32_t replay)
{
struct mbuf *m;
struct sadb_x_sa_replay *p;
size_t len;
len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa_replay));
m = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (m == NULL)
return (NULL);
m_align(m, len);
m->m_len = len;
p = mtod(m, struct sadb_x_sa_replay *);
bzero(p, len);
p->sadb_x_sa_replay_len = PFKEY_UNIT64(len);
p->sadb_x_sa_replay_exttype = SADB_X_EXT_SA_REPLAY;
p->sadb_x_sa_replay_replay = (replay << 3);
return m;
}
/*
* Set a type in sadb_x_nat_t_type.
*/
static struct mbuf *
key_setsadbxtype(u_int16_t type)
{
struct mbuf *m;
size_t len;
struct sadb_x_nat_t_type *p;
len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type));
m = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (m == NULL)
return (NULL);
m_align(m, len);
m->m_len = len;
p = mtod(m, struct sadb_x_nat_t_type *);
bzero(p, len);
p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len);
p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
p->sadb_x_nat_t_type_type = type;
return (m);
}
/*
* Set a port in sadb_x_nat_t_port.
* In contrast to default RFC 2367 behaviour, port is in network byte order.
*/
static struct mbuf *
key_setsadbxport(u_int16_t port, u_int16_t type)
{
struct mbuf *m;
size_t len;
struct sadb_x_nat_t_port *p;
len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port));
m = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (m == NULL)
return (NULL);
m_align(m, len);
m->m_len = len;
p = mtod(m, struct sadb_x_nat_t_port *);
bzero(p, len);
p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len);
p->sadb_x_nat_t_port_exttype = type;
p->sadb_x_nat_t_port_port = port;
return (m);
}
/*
* Get port from sockaddr. Port is in network byte order.
*/
uint16_t
key_portfromsaddr(struct sockaddr *sa)
{
switch (sa->sa_family) {
#ifdef INET
case AF_INET:
return ((struct sockaddr_in *)sa)->sin_port;
#endif
#ifdef INET6
case AF_INET6:
return ((struct sockaddr_in6 *)sa)->sin6_port;
#endif
}
return (0);
}
/*
* Set port in struct sockaddr. Port is in network byte order.
*/
void
key_porttosaddr(struct sockaddr *sa, uint16_t port)
{
switch (sa->sa_family) {
#ifdef INET
case AF_INET:
((struct sockaddr_in *)sa)->sin_port = port;
break;
#endif
#ifdef INET6
case AF_INET6:
((struct sockaddr_in6 *)sa)->sin6_port = port;
break;
#endif
default:
ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n",
__func__, sa->sa_family));
break;
}
}
/*
* set data into sadb_x_policy
*/
static struct mbuf *
key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id, u_int32_t priority)
{
struct mbuf *m;
struct sadb_x_policy *p;
size_t len;
len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy));
m = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (m == NULL)
return (NULL);
m_align(m, len);
m->m_len = len;
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;
p->sadb_x_policy_priority = priority;
return m;
}
/* %%% utilities */
/* Take a key message (sadb_key) from the socket and turn it into one
* of the kernel's key structures (seckey).
*
* IN: pointer to the src
* OUT: NULL no more memory
*/
struct seckey *
key_dup_keymsg(const struct sadb_key *src, size_t len,
struct malloc_type *type)
{
struct seckey *dst;
dst = malloc(sizeof(*dst), type, M_NOWAIT);
if (dst != NULL) {
dst->bits = src->sadb_key_bits;
dst->key_data = malloc(len, type, M_NOWAIT);
if (dst->key_data != NULL) {
bcopy((const char *)(src + 1), dst->key_data, len);
} else {
ipseclog((LOG_DEBUG, "%s: No more memory.\n",
__func__));
free(dst, type);
dst = NULL;
}
} else {
ipseclog((LOG_DEBUG, "%s: No more memory.\n",
__func__));
}
return (dst);
}
/* Take a lifetime message (sadb_lifetime) passed in on a socket and
* turn it into one of the kernel's lifetime structures (seclifetime).
*
* IN: pointer to the destination, source and malloc type
* OUT: NULL, no more memory
*/
static struct seclifetime *
key_dup_lifemsg(const struct sadb_lifetime *src, struct malloc_type *type)
{
struct seclifetime *dst;
dst = malloc(sizeof(*dst), type, M_NOWAIT);
if (dst == NULL) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
return (NULL);
}
dst->allocations = src->sadb_lifetime_allocations;
dst->bytes = src->sadb_lifetime_bytes;
dst->addtime = src->sadb_lifetime_addtime;
dst->usetime = src->sadb_lifetime_usetime;
return (dst);
}
/*
* 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(const struct secasindex *saidx0, const struct secasindex *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.sa.sa_len) != 0 ||
bcmp(&saidx0->dst, &saidx1->dst,
saidx0->dst.sa.sa_len) != 0)
return 0;
} else {
/* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */
if (flag == CMP_MODE_REQID || flag == CMP_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(&saidx0->src.sa, &saidx1->src.sa, 0) != 0)
return 0;
if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 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
*/
static int
key_cmpspidx_exactly(struct secpolicyindex *spidx0,
struct secpolicyindex *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;
return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 &&
key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0;
}
/*
* 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
*/
static int
key_cmpspidx_withmask(struct secpolicyindex *spidx0,
struct secpolicyindex *spidx1)
{
/* sanity */
if (spidx0 == NULL && spidx1 == NULL)
return 1;
if (spidx0 == NULL || spidx1 == NULL)
return 0;
if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family ||
spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family ||
spidx0->src.sa.sa_len != spidx1->src.sa.sa_len ||
spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_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.sa.sa_family) {
case AF_INET:
if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY
&& spidx0->src.sin.sin_port != spidx1->src.sin.sin_port)
return 0;
if (!key_bbcmp(&spidx0->src.sin.sin_addr,
&spidx1->src.sin.sin_addr, spidx0->prefs))
return 0;
break;
case AF_INET6:
if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY
&& spidx0->src.sin6.sin6_port != spidx1->src.sin6.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 (spidx0->src.sin6.sin6_scope_id &&
spidx1->src.sin6.sin6_scope_id &&
spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id)
return 0;
if (!key_bbcmp(&spidx0->src.sin6.sin6_addr,
&spidx1->src.sin6.sin6_addr, spidx0->prefs))
return 0;
break;
default:
/* XXX */
if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0)
return 0;
break;
}
switch (spidx0->dst.sa.sa_family) {
case AF_INET:
if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY
&& spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port)
return 0;
if (!key_bbcmp(&spidx0->dst.sin.sin_addr,
&spidx1->dst.sin.sin_addr, spidx0->prefd))
return 0;
break;
case AF_INET6:
if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY
&& spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.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 (spidx0->dst.sin6.sin6_scope_id &&
spidx1->dst.sin6.sin6_scope_id &&
spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id)
return 0;
if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr,
&spidx1->dst.sin6.sin6_addr, spidx0->prefd))
return 0;
break;
default:
/* XXX */
if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0)
return 0;
break;
}
/* XXX Do we check other field ? e.g. flowinfo */
return 1;
}
#ifdef satosin
#undef satosin
#endif
#define satosin(s) ((const struct sockaddr_in *)s)
#ifdef satosin6
#undef satosin6
#endif
#define satosin6(s) ((const struct sockaddr_in6 *)s)
/* returns 0 on match */
int
key_sockaddrcmp(const struct sockaddr *sa1, const struct sockaddr *sa2,
int port)
{
if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
return 1;
switch (sa1->sa_family) {
#ifdef INET
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;
#endif
#ifdef INET6
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;
#endif
default:
if (bcmp(sa1, sa2, sa1->sa_len) != 0)
return 1;
break;
}
return 0;
}
/* returns 0 on match */
int
key_sockaddrcmp_withmask(const struct sockaddr *sa1,
const struct sockaddr *sa2, size_t mask)
{
if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
return (1);
switch (sa1->sa_family) {
#ifdef INET
case AF_INET:
return (!key_bbcmp(&satosin(sa1)->sin_addr,
&satosin(sa2)->sin_addr, mask));
#endif
#ifdef INET6
case AF_INET6:
if (satosin6(sa1)->sin6_scope_id !=
satosin6(sa2)->sin6_scope_id)
return (1);
return (!key_bbcmp(&satosin6(sa1)->sin6_addr,
&satosin6(sa2)->sin6_addr, mask));
#endif
}
return (1);
}
#undef satosin
#undef satosin6
/*
* 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(const void *a1, const void *a2, u_int bits)
{
const unsigned char *p1 = a1;
const unsigned char *p2 = a2;
/* 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) {
u_int8_t mask = ~((1<<(8-bits))-1);
if ((*p1 & mask) != (*p2 & mask))
return 0;
}
return 1; /* Match! */
}
static void
key_flush_spd(time_t now)
{
SPTREE_RLOCK_TRACKER;
struct secpolicy_list drainq;
struct secpolicy *sp, *nextsp;
u_int dir;
LIST_INIT(&drainq);
SPTREE_RLOCK();
for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
if (sp->lifetime == 0 && sp->validtime == 0)
continue;
if ((sp->lifetime &&
now - sp->created > sp->lifetime) ||
(sp->validtime &&
now - sp->lastused > sp->validtime)) {
/* Hold extra reference to send SPDEXPIRE */
SP_ADDREF(sp);
LIST_INSERT_HEAD(&drainq, sp, drainq);
}
}
}
SPTREE_RUNLOCK();
if (LIST_EMPTY(&drainq))
return;
SPTREE_WLOCK();
sp = LIST_FIRST(&drainq);
while (sp != NULL) {
nextsp = LIST_NEXT(sp, drainq);
/* Check that SP is still linked */
if (sp->state != IPSEC_SPSTATE_ALIVE) {
LIST_REMOVE(sp, drainq);
key_freesp(&sp); /* release extra reference */
sp = nextsp;
continue;
}
TAILQ_REMOVE(&V_sptree[sp->spidx.dir], sp, chain);
LIST_REMOVE(sp, idhash);
sp->state = IPSEC_SPSTATE_DEAD;
sp = nextsp;
}
V_sp_genid++;
SPTREE_WUNLOCK();
sp = LIST_FIRST(&drainq);
while (sp != NULL) {
nextsp = LIST_NEXT(sp, drainq);
key_spdexpire(sp);
key_freesp(&sp); /* release extra reference */
key_freesp(&sp); /* release last reference */
sp = nextsp;
}
}
static void
key_flush_sad(time_t now)
{
SAHTREE_RLOCK_TRACKER;
struct secashead_list emptyq;
struct secasvar_list drainq, hexpireq, sexpireq, freeq;
struct secashead *sah, *nextsah;
struct secasvar *sav, *nextsav;
LIST_INIT(&drainq);
LIST_INIT(&hexpireq);
LIST_INIT(&sexpireq);
LIST_INIT(&emptyq);
SAHTREE_RLOCK();
TAILQ_FOREACH(sah, &V_sahtree, chain) {
/* Check for empty SAH */
if (TAILQ_EMPTY(&sah->savtree_larval) &&
TAILQ_EMPTY(&sah->savtree_alive)) {
SAH_ADDREF(sah);
LIST_INSERT_HEAD(&emptyq, sah, drainq);
continue;
}
/* Add all stale LARVAL SAs into drainq */
TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
if (now - sav->created < V_key_larval_lifetime)
continue;
SAV_ADDREF(sav);
LIST_INSERT_HEAD(&drainq, sav, drainq);
}
TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
/* lifetimes aren't specified */
if (sav->lft_h == NULL)
continue;
SECASVAR_LOCK(sav);
/*
* Check again with lock held, because it may
* be updated by SADB_UPDATE.
*/
if (sav->lft_h == NULL) {
SECASVAR_UNLOCK(sav);
continue;
}
/*
* RFC 2367:
* HARD lifetimes MUST take precedence over SOFT
* lifetimes, meaning if the HARD and SOFT lifetimes
* are the same, the HARD lifetime will appear on the
* EXPIRE message.
*/
/* check HARD lifetime */
if ((sav->lft_h->addtime != 0 &&
now - sav->created > sav->lft_h->addtime) ||
(sav->lft_h->usetime != 0 && sav->firstused &&
now - sav->firstused > sav->lft_h->usetime) ||
(sav->lft_h->bytes != 0 && counter_u64_fetch(
sav->lft_c_bytes) > sav->lft_h->bytes)) {
SECASVAR_UNLOCK(sav);
SAV_ADDREF(sav);
LIST_INSERT_HEAD(&hexpireq, sav, drainq);
continue;
}
/* check SOFT lifetime (only for MATURE SAs) */
if (sav->state == SADB_SASTATE_MATURE && (
(sav->lft_s->addtime != 0 &&
now - sav->created > sav->lft_s->addtime) ||
(sav->lft_s->usetime != 0 && sav->firstused &&
now - sav->firstused > sav->lft_s->usetime) ||
(sav->lft_s->bytes != 0 && counter_u64_fetch(
sav->lft_c_bytes) > sav->lft_s->bytes))) {
SECASVAR_UNLOCK(sav);
SAV_ADDREF(sav);
LIST_INSERT_HEAD(&sexpireq, sav, drainq);
continue;
}
SECASVAR_UNLOCK(sav);
}
}
SAHTREE_RUNLOCK();
if (LIST_EMPTY(&emptyq) && LIST_EMPTY(&drainq) &&
LIST_EMPTY(&hexpireq) && LIST_EMPTY(&sexpireq))
return;
LIST_INIT(&freeq);
SAHTREE_WLOCK();
/* Unlink stale LARVAL SAs */
sav = LIST_FIRST(&drainq);
while (sav != NULL) {
nextsav = LIST_NEXT(sav, drainq);
/* Check that SA is still LARVAL */
if (sav->state != SADB_SASTATE_LARVAL) {
LIST_REMOVE(sav, drainq);
LIST_INSERT_HEAD(&freeq, sav, drainq);
sav = nextsav;
continue;
}
TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
LIST_REMOVE(sav, spihash);
sav->state = SADB_SASTATE_DEAD;
sav = nextsav;
}
/* Unlink all SAs with expired HARD lifetime */
sav = LIST_FIRST(&hexpireq);
while (sav != NULL) {
nextsav = LIST_NEXT(sav, drainq);
/* Check that SA is not unlinked */
if (sav->state == SADB_SASTATE_DEAD) {
LIST_REMOVE(sav, drainq);
LIST_INSERT_HEAD(&freeq, sav, drainq);
sav = nextsav;
continue;
}
TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
LIST_REMOVE(sav, spihash);
sav->state = SADB_SASTATE_DEAD;
sav = nextsav;
}
/* Mark all SAs with expired SOFT lifetime as DYING */
sav = LIST_FIRST(&sexpireq);
while (sav != NULL) {
nextsav = LIST_NEXT(sav, drainq);
/* Check that SA is not unlinked */
if (sav->state == SADB_SASTATE_DEAD) {
LIST_REMOVE(sav, drainq);
LIST_INSERT_HEAD(&freeq, sav, drainq);
sav = nextsav;
continue;
}
/*
* NOTE: this doesn't change SA order in the chain.
*/
sav->state = SADB_SASTATE_DYING;
sav = nextsav;
}
/* Unlink empty SAHs */
sah = LIST_FIRST(&emptyq);
while (sah != NULL) {
nextsah = LIST_NEXT(sah, drainq);
/* Check that SAH is still empty and not unlinked */
if (sah->state == SADB_SASTATE_DEAD ||
!TAILQ_EMPTY(&sah->savtree_larval) ||
!TAILQ_EMPTY(&sah->savtree_alive)) {
LIST_REMOVE(sah, drainq);
key_freesah(&sah); /* release extra reference */
sah = nextsah;
continue;
}
TAILQ_REMOVE(&V_sahtree, sah, chain);
LIST_REMOVE(sah, addrhash);
sah->state = SADB_SASTATE_DEAD;
sah = nextsah;
}
SAHTREE_WUNLOCK();
/* Send SPDEXPIRE messages */
sav = LIST_FIRST(&hexpireq);
while (sav != NULL) {
nextsav = LIST_NEXT(sav, drainq);
key_expire(sav, 1);
key_freesah(&sav->sah); /* release reference from SAV */
key_freesav(&sav); /* release extra reference */
key_freesav(&sav); /* release last reference */
sav = nextsav;
}
sav = LIST_FIRST(&sexpireq);
while (sav != NULL) {
nextsav = LIST_NEXT(sav, drainq);
key_expire(sav, 0);
key_freesav(&sav); /* release extra reference */
sav = nextsav;
}
/* Free stale LARVAL SAs */
sav = LIST_FIRST(&drainq);
while (sav != NULL) {
nextsav = LIST_NEXT(sav, drainq);
key_freesah(&sav->sah); /* release reference from SAV */
key_freesav(&sav); /* release extra reference */
key_freesav(&sav); /* release last reference */
sav = nextsav;
}
/* Free SAs that were unlinked/changed by someone else */
sav = LIST_FIRST(&freeq);
while (sav != NULL) {
nextsav = LIST_NEXT(sav, drainq);
key_freesav(&sav); /* release extra reference */
sav = nextsav;
}
/* Free empty SAH */
sah = LIST_FIRST(&emptyq);
while (sah != NULL) {
nextsah = LIST_NEXT(sah, drainq);
key_freesah(&sah); /* release extra reference */
key_freesah(&sah); /* release last reference */
sah = nextsah;
}
}
static void
key_flush_acq(time_t now)
{
struct secacq *acq, *nextacq;
/* ACQ tree */
ACQ_LOCK();
acq = LIST_FIRST(&V_acqtree);
while (acq != NULL) {
nextacq = LIST_NEXT(acq, chain);
if (now - acq->created > V_key_blockacq_lifetime) {
LIST_REMOVE(acq, chain);
LIST_REMOVE(acq, addrhash);
LIST_REMOVE(acq, seqhash);
free(acq, M_IPSEC_SAQ);
}
acq = nextacq;
}
ACQ_UNLOCK();
}
static void
key_flush_spacq(time_t now)
{
struct secspacq *acq, *nextacq;
/* SP ACQ tree */
SPACQ_LOCK();
for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) {
nextacq = LIST_NEXT(acq, chain);
if (now - acq->created > V_key_blockacq_lifetime
&& __LIST_CHAINED(acq)) {
LIST_REMOVE(acq, chain);
free(acq, M_IPSEC_SAQ);
}
}
SPACQ_UNLOCK();
}
/*
* 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.
*/
static void
key_timehandler(void *arg)
{
VNET_ITERATOR_DECL(vnet_iter);
time_t now = time_second;
VNET_LIST_RLOCK_NOSLEEP();
VNET_FOREACH(vnet_iter) {
CURVNET_SET(vnet_iter);
key_flush_spd(now);
key_flush_sad(now);
key_flush_acq(now);
key_flush_spacq(now);
CURVNET_RESTORE();
}
VNET_LIST_RUNLOCK_NOSLEEP();
#ifndef IPSEC_DEBUG2
/* do exchange to tick time !! */
callout_schedule(&key_timer, hz);
#endif /* IPSEC_DEBUG2 */
}
u_long
key_random()
{
u_long value;
key_randomfill(&value, sizeof(value));
return value;
}
void
key_randomfill(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 uint8_t
key_satype2proto(uint8_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 uint8_t
key_proto2satype(uint8_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(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
struct secasindex saidx;
struct sadb_address *src0, *dst0;
struct secasvar *sav;
uint32_t reqid, spi;
int error;
uint8_t mode, proto;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST)
#ifdef PFKEY_STRICT_CHECKS
|| SADB_CHECKHDR(mhp, SADB_EXT_SPIRANGE)
#endif
) {
ipseclog((LOG_DEBUG,
"%s: invalid message: missing required header.\n",
__func__));
error = EINVAL;
goto fail;
}
if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)
#ifdef PFKEY_STRICT_CHECKS
|| SADB_CHECKLEN(mhp, SADB_EXT_SPIRANGE)
#endif
) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n", __func__));
error = EINVAL;
goto fail;
}
if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
mode = IPSEC_MODE_ANY;
reqid = 0;
} else {
if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n",
__func__));
error = EINVAL;
goto fail;
}
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;
}
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, "%s: invalid satype is passed.\n",
__func__));
error = EINVAL;
goto fail;
}
error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
(struct sockaddr *)(dst0 + 1));
if (error != 0) {
ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
error = EINVAL;
goto fail;
}
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) {
/*
* Requested SPI or SPI range is not available or
* already used.
*/
error = EEXIST;
goto fail;
}
sav = key_newsav(mhp, &saidx, spi, &error);
if (sav == NULL)
goto fail;
if (sav->seq != 0) {
/*
* RFC2367:
* If the SADB_GETSPI message is in response to a
* kernel-generated SADB_ACQUIRE, the sadb_msg_seq
* MUST be the same as the SADB_ACQUIRE message.
*
* XXXAE: However it doesn't definethe behaviour how to
* check this and what to do if it doesn't match.
* Also what we should do if it matches?
*
* We can compare saidx used in SADB_ACQUIRE with saidx
* used in SADB_GETSPI, but this probably can break
* existing software. For now just warn if it doesn't match.
*
* XXXAE: anyway it looks useless.
*/
key_acqdone(&saidx, sav->seq);
}
KEYDBG(KEY_STAMP,
printf("%s: SA(%p)\n", __func__, sav));
KEYDBG(KEY_DATA, kdebug_secasv(sav));
{
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));
MGETHDR(n, M_NOWAIT, MT_DATA);
if (len > MHLEN) {
if (!(MCLGET(n, M_NOWAIT))) {
m_freem(n);
n = NULL;
}
}
if (!n) {
error = ENOBUFS;
goto fail;
}
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 = spi; /* SPI is already in network byte order */
off += PFKEY_ALIGN8(sizeof(struct sadb_sa));
IPSEC_ASSERT(off == len,
("length inconsistency (off %u len %u)", off, len));
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);
error = ENOBUFS;
goto fail;
}
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 = sav->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);
}
fail:
return (key_senderror(so, m, error));
}
/*
* allocating new SPI
* called by key_getspi().
* OUT:
* 0: failure.
* others: success, SPI in network byte order.
*/
static uint32_t
key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx)
{
uint32_t min, max, newspi, t;
int count = V_key_spi_trycnt;
/* set spi range to allocate */
if (spirange != NULL) {
min = spirange->sadb_spirange_min;
max = spirange->sadb_spirange_max;
} else {
min = V_key_spi_minval;
max = V_key_spi_maxval;
}
/* IPCOMP needs 2-byte SPI */
if (saidx->proto == IPPROTO_IPCOMP) {
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(htonl(min))) {
ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n",
__func__, 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(htonl(newspi)))
break;
}
if (count == 0 || newspi == 0) {
ipseclog((LOG_DEBUG,
"%s: failed to allocate SPI.\n", __func__));
return 0;
}
}
/* statistics */
keystat.getspi_count =
(keystat.getspi_count + V_key_spi_trycnt - count) / 2;
return (htonl(newspi));
}
/*
* Find TCP-MD5 SA with corresponding secasindex.
* If not found, return NULL and fill SPI with usable value if needed.
*/
static struct secasvar *
key_getsav_tcpmd5(struct secasindex *saidx, uint32_t *spi)
{
SAHTREE_RLOCK_TRACKER;
struct secashead *sah;
struct secasvar *sav;
IPSEC_ASSERT(saidx->proto == IPPROTO_TCP, ("wrong proto"));
SAHTREE_RLOCK();
LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
if (sah->saidx.proto != IPPROTO_TCP)
continue;
if (!key_sockaddrcmp(&saidx->dst.sa, &sah->saidx.dst.sa, 0))
break;
}
if (sah != NULL) {
if (V_key_preferred_oldsa)
sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
else
sav = TAILQ_FIRST(&sah->savtree_alive);
if (sav != NULL) {
SAV_ADDREF(sav);
SAHTREE_RUNLOCK();
return (sav);
}
}
if (spi == NULL) {
/* No SPI required */
SAHTREE_RUNLOCK();
return (NULL);
}
/* Check that SPI is unique */
LIST_FOREACH(sav, SAVHASH_HASH(*spi), spihash) {
if (sav->spi == *spi)
break;
}
if (sav == NULL) {
SAHTREE_RUNLOCK();
/* SPI is already unique */
return (NULL);
}
SAHTREE_RUNLOCK();
/* XXX: not optimal */
*spi = key_do_getnewspi(NULL, saidx);
return (NULL);
}
static int
key_updateaddresses(struct socket *so, struct mbuf *m,
const struct sadb_msghdr *mhp, struct secasvar *sav,
struct secasindex *saidx)
{
struct sockaddr *newaddr;
struct secashead *sah;
struct secasvar *newsav, *tmp;
struct mbuf *n;
int error, isnew;
/* Check that we need to change SAH */
if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC)) {
newaddr = (struct sockaddr *)(
((struct sadb_address *)
mhp->ext[SADB_X_EXT_NEW_ADDRESS_SRC]) + 1);
bcopy(newaddr, &saidx->src, newaddr->sa_len);
key_porttosaddr(&saidx->src.sa, 0);
}
if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST)) {
newaddr = (struct sockaddr *)(
((struct sadb_address *)
mhp->ext[SADB_X_EXT_NEW_ADDRESS_DST]) + 1);
bcopy(newaddr, &saidx->dst, newaddr->sa_len);
key_porttosaddr(&saidx->dst.sa, 0);
}
if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC) ||
!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST)) {
error = key_checksockaddrs(&saidx->src.sa, &saidx->dst.sa);
if (error != 0) {
ipseclog((LOG_DEBUG, "%s: invalid new sockaddr.\n",
__func__));
return (error);
}
sah = key_getsah(saidx);
if (sah == NULL) {
/* create a new SA index */
sah = key_newsah(saidx);
if (sah == NULL) {
ipseclog((LOG_DEBUG,
"%s: No more memory.\n", __func__));
return (ENOBUFS);
}
isnew = 2; /* SAH is new */
} else
isnew = 1; /* existing SAH is referenced */
} else {
/*
* src and dst addresses are still the same.
* Do we want to change NAT-T config?
*/
if (sav->sah->saidx.proto != IPPROTO_ESP ||
SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) ||
SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_SPORT) ||
SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_DPORT)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: missing required header.\n",
__func__));
return (EINVAL);
}
/* We hold reference to SA, thus SAH will be referenced too. */
sah = sav->sah;
isnew = 0;
}
newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA,
M_NOWAIT | M_ZERO);
if (newsav == NULL) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
error = ENOBUFS;
goto fail;
}
/* Clone SA's content into newsav */
SAV_INITREF(newsav);
bcopy(sav, newsav, offsetof(struct secasvar, chain));
/*
* We create new NAT-T config if it is needed.
* Old NAT-T config will be freed by key_cleansav() when
* last reference to SA will be released.
*/
newsav->natt = NULL;
newsav->sah = sah;
newsav->state = SADB_SASTATE_MATURE;
error = key_setnatt(sav, mhp);
if (error != 0)
goto fail;
SAHTREE_WLOCK();
/* Check that SA is still alive */
if (sav->state == SADB_SASTATE_DEAD) {
/* SA was unlinked */
SAHTREE_WUNLOCK();
error = ESRCH;
goto fail;
}
/* Unlink SA from SAH and SPI hash */
IPSEC_ASSERT((sav->flags & SADB_X_EXT_F_CLONED) == 0,
("SA is already cloned"));
IPSEC_ASSERT(sav->state == SADB_SASTATE_MATURE ||
sav->state == SADB_SASTATE_DYING,
("Wrong SA state %u\n", sav->state));
TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
LIST_REMOVE(sav, spihash);
sav->state = SADB_SASTATE_DEAD;
/*
* Link new SA with SAH. Keep SAs ordered by
* create time (newer are first).
*/
TAILQ_FOREACH(tmp, &sah->savtree_alive, chain) {
if (newsav->created > tmp->created) {
TAILQ_INSERT_BEFORE(tmp, newsav, chain);
break;
}
}
if (tmp == NULL)
TAILQ_INSERT_TAIL(&sah->savtree_alive, newsav, chain);
/* Add new SA into SPI hash. */
LIST_INSERT_HEAD(SAVHASH_HASH(newsav->spi), newsav, spihash);
/* Add new SAH into SADB. */
if (isnew == 2) {
TAILQ_INSERT_HEAD(&V_sahtree, sah, chain);
LIST_INSERT_HEAD(SAHADDRHASH_HASH(saidx), sah, addrhash);
sah->state = SADB_SASTATE_MATURE;
SAH_ADDREF(sah); /* newsav references new SAH */
}
/*
* isnew == 1 -> @sah was referenced by key_getsah().
* isnew == 0 -> we use the same @sah, that was used by @sav,
* and we use its reference for @newsav.
*/
SECASVAR_LOCK(sav);
/* XXX: replace cntr with pointer? */
newsav->cntr = sav->cntr;
sav->flags |= SADB_X_EXT_F_CLONED;
SECASVAR_UNLOCK(sav);
SAHTREE_WUNLOCK();
KEYDBG(KEY_STAMP,
printf("%s: SA(%p) cloned into SA(%p)\n",
__func__, sav, newsav));
KEYDBG(KEY_DATA, kdebug_secasv(newsav));
key_freesav(&sav); /* release last reference */
/* set msg buf from mhp */
n = key_getmsgbuf_x1(m, mhp);
if (n == NULL) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
return (ENOBUFS);
}
m_freem(m);
key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
return (0);
fail:
if (isnew != 0)
key_freesah(&sah);
if (newsav != NULL) {
if (newsav->natt != NULL)
free(newsav->natt, M_IPSEC_MISC);
free(newsav, M_IPSEC_SA);
}
return (error);
}
/*
* 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(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
struct secasindex saidx;
struct sadb_address *src0, *dst0;
struct sadb_sa *sa0;
struct secasvar *sav;
uint32_t reqid;
int error;
uint8_t mode, proto;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
(SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
!SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
(SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
!SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
ipseclog((LOG_DEBUG,
"%s: invalid message: missing required header.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n", __func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
mode = IPSEC_MODE_ANY;
reqid = 0;
} else {
if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
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;
}
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]);
/*
* Only SADB_SASTATE_MATURE SAs may be submitted in an
* SADB_UPDATE message.
*/
if (sa0->sadb_sa_state != SADB_SASTATE_MATURE) {
ipseclog((LOG_DEBUG, "%s: invalid state.\n", __func__));
#ifdef PFKEY_STRICT_CHECKS
return key_senderror(so, m, EINVAL);
#endif
}
error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
(struct sockaddr *)(dst0 + 1));
if (error != 0) {
ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
return key_senderror(so, m, error);
}
KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
sav = key_getsavbyspi(sa0->sadb_sa_spi);
if (sav == NULL) {
ipseclog((LOG_DEBUG, "%s: no SA found for SPI %u\n",
__func__, ntohl(sa0->sadb_sa_spi)));
return key_senderror(so, m, EINVAL);
}
/*
* Check that SADB_UPDATE issued by the same process that did
* SADB_GETSPI or SADB_ADD.
*/
if (sav->pid != mhp->msg->sadb_msg_pid) {
ipseclog((LOG_DEBUG,
"%s: pid mismatched (SPI %u, pid %u vs. %u)\n", __func__,
ntohl(sav->spi), sav->pid, mhp->msg->sadb_msg_pid));
key_freesav(&sav);
return key_senderror(so, m, EINVAL);
}
/* saidx should match with SA. */
if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_MODE_REQID) == 0) {
ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u",
__func__, ntohl(sav->spi)));
key_freesav(&sav);
return key_senderror(so, m, ESRCH);
}
if (sav->state == SADB_SASTATE_LARVAL) {
if ((mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT)) ||
(mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH))) {
ipseclog((LOG_DEBUG,
"%s: invalid message: missing required header.\n",
__func__));
key_freesav(&sav);
return key_senderror(so, m, EINVAL);
}
/*
* We can set any values except src, dst and SPI.
*/
error = key_setsaval(sav, mhp);
if (error != 0) {
key_freesav(&sav);
return (key_senderror(so, m, error));
}
/* Change SA state to MATURE */
SAHTREE_WLOCK();
if (sav->state != SADB_SASTATE_LARVAL) {
/* SA was deleted or another thread made it MATURE. */
SAHTREE_WUNLOCK();
key_freesav(&sav);
return (key_senderror(so, m, ESRCH));
}
/*
* NOTE: we keep SAs in savtree_alive ordered by created
* time. When SA's state changed from LARVAL to MATURE,
* we update its created time in key_setsaval() and move
* it into head of savtree_alive.
*/
TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
TAILQ_INSERT_HEAD(&sav->sah->savtree_alive, sav, chain);
sav->state = SADB_SASTATE_MATURE;
SAHTREE_WUNLOCK();
} else {
/*
* For DYING and MATURE SA we can change only state
* and lifetimes. Report EINVAL if something else attempted
* to change.
*/
if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT) ||
!SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH)) {
key_freesav(&sav);
return (key_senderror(so, m, EINVAL));
}
error = key_updatelifetimes(sav, mhp);
if (error != 0) {
key_freesav(&sav);
return (key_senderror(so, m, error));
}
/*
* This is FreeBSD extension to RFC2367.
* IKEd can specify SADB_X_EXT_NEW_ADDRESS_SRC and/or
* SADB_X_EXT_NEW_ADDRESS_DST when it wants to change
* SA addresses (for example to implement MOBIKE protocol
* as described in RFC4555). Also we allow to change
* NAT-T config.
*/
if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC) ||
!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST) ||
!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) ||
sav->natt != NULL) {
error = key_updateaddresses(so, m, mhp, sav, &saidx);
key_freesav(&sav);
if (error != 0)
return (key_senderror(so, m, error));
return (0);
}
/* Check that SA is still alive */
SAHTREE_WLOCK();
if (sav->state == SADB_SASTATE_DEAD) {
/* SA was unlinked */
SAHTREE_WUNLOCK();
key_freesav(&sav);
return (key_senderror(so, m, ESRCH));
}
/*
* NOTE: there is possible state moving from DYING to MATURE,
* but this doesn't change created time, so we won't reorder
* this SA.
*/
sav->state = SADB_SASTATE_MATURE;
SAHTREE_WUNLOCK();
}
KEYDBG(KEY_STAMP,
printf("%s: SA(%p)\n", __func__, sav));
KEYDBG(KEY_DATA, kdebug_secasv(sav));
key_freesav(&sav);
{
struct mbuf *n;
/* set msg buf from mhp */
n = key_getmsgbuf_x1(m, mhp);
if (n == NULL) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
return key_senderror(so, m, ENOBUFS);
}
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
}
}
/*
* 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(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
struct secasindex saidx;
struct sadb_address *src0, *dst0;
struct sadb_sa *sa0;
struct secasvar *sav;
uint32_t reqid, spi;
uint8_t mode, proto;
int error;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
(mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && (
SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT) ||
SADB_CHECKLEN(mhp, SADB_EXT_KEY_ENCRYPT))) ||
(mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && (
SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH) ||
SADB_CHECKLEN(mhp, SADB_EXT_KEY_AUTH))) ||
(SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
!SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
(SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
!SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
ipseclog((LOG_DEBUG,
"%s: invalid message: missing required header.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n", __func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
mode = IPSEC_MODE_ANY;
reqid = 0;
} else {
if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
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;
}
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];
/*
* Only SADB_SASTATE_MATURE SAs may be submitted in an
* SADB_ADD message.
*/
if (sa0->sadb_sa_state != SADB_SASTATE_MATURE) {
ipseclog((LOG_DEBUG, "%s: invalid state.\n", __func__));
#ifdef PFKEY_STRICT_CHECKS
return key_senderror(so, m, EINVAL);
#endif
}
error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
(struct sockaddr *)(dst0 + 1));
if (error != 0) {
ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
return key_senderror(so, m, error);
}
KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
spi = sa0->sadb_sa_spi;
/*
* For TCP-MD5 SAs we don't use SPI. Check the uniqueness using
* secasindex.
* XXXAE: IPComp seems also doesn't use SPI.
*/
if (proto == IPPROTO_TCP) {
sav = key_getsav_tcpmd5(&saidx, &spi);
if (sav == NULL && spi == 0) {
/* Failed to allocate SPI */
ipseclog((LOG_DEBUG, "%s: SA already exists.\n",
__func__));
return key_senderror(so, m, EEXIST);
}
/* XXX: SPI that we report back can have another value */
} else {
/* We can create new SA only if SPI is different. */
sav = key_getsavbyspi(spi);
}
if (sav != NULL) {
key_freesav(&sav);
ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__));
return key_senderror(so, m, EEXIST);
}
sav = key_newsav(mhp, &saidx, spi, &error);
if (sav == NULL)
return key_senderror(so, m, error);
KEYDBG(KEY_STAMP,
printf("%s: return SA(%p)\n", __func__, sav));
KEYDBG(KEY_DATA, kdebug_secasv(sav));
/*
* If SADB_ADD was in response to SADB_ACQUIRE, we need to schedule
* ACQ for deletion.
*/
if (sav->seq != 0)
key_acqdone(&saidx, sav->seq);
{
/*
* Don't call key_freesav() on error here, as we would like to
* keep the SA in the database.
*/
struct mbuf *n;
/* set msg buf from mhp */
n = key_getmsgbuf_x1(m, mhp);
if (n == NULL) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
return key_senderror(so, m, ENOBUFS);
}
m_freem(m);
return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
}
}
/*
* NAT-T support.
* IKEd may request the use ESP in UDP encapsulation when it detects the
* presence of NAT. It uses NAT-T extension headers for such SAs to specify
* parameters needed for encapsulation and decapsulation. These PF_KEY
* extension headers are not standardized, so this comment addresses our
* implementation.
* SADB_X_EXT_NAT_T_TYPE specifies type of encapsulation, we support only
* UDP_ENCAP_ESPINUDP as described in RFC3948.
* SADB_X_EXT_NAT_T_SPORT/DPORT specifies source and destination ports for
* UDP header. We use these ports in UDP encapsulation procedure, also we
* can check them in UDP decapsulation procedure.
* SADB_X_EXT_NAT_T_OA[IR] specifies original address of initiator or
* responder. These addresses can be used for transport mode to adjust
* checksum after decapsulation and decryption. Since original IP addresses
* used by peer usually different (we detected presence of NAT), TCP/UDP
* pseudo header checksum and IP header checksum was calculated using original
* addresses. After decapsulation and decryption we need to adjust checksum
* to have correct datagram.
*
* We expect presence of NAT-T extension headers only in SADB_ADD and
* SADB_UPDATE messages. We report NAT-T extension headers in replies
* to SADB_ADD, SADB_UPDATE, SADB_GET, and SADB_DUMP messages.
*/
static int
key_setnatt(struct secasvar *sav, const struct sadb_msghdr *mhp)
{
struct sadb_x_nat_t_port *port;
struct sadb_x_nat_t_type *type;
struct sadb_address *oai, *oar;
struct sockaddr *sa;
uint32_t addr;
uint16_t cksum;
IPSEC_ASSERT(sav->natt == NULL, ("natt is already initialized"));
/*
* Ignore NAT-T headers if sproto isn't ESP.
*/
if (sav->sah->saidx.proto != IPPROTO_ESP)
return (0);
if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) &&
!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_SPORT) &&
!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_DPORT)) {
if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_TYPE) ||
SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_SPORT) ||
SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_DPORT)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n",
__func__));
return (EINVAL);
}
} else
return (0);
type = (struct sadb_x_nat_t_type *)mhp->ext[SADB_X_EXT_NAT_T_TYPE];
if (type->sadb_x_nat_t_type_type != UDP_ENCAP_ESPINUDP) {
ipseclog((LOG_DEBUG, "%s: unsupported NAT-T type %u.\n",
__func__, type->sadb_x_nat_t_type_type));
return (EINVAL);
}
/*
* Allocate storage for NAT-T config.
* On error it will be released by key_cleansav().
*/
sav->natt = malloc(sizeof(struct secnatt), M_IPSEC_MISC,
M_NOWAIT | M_ZERO);
if (sav->natt == NULL) {
PFKEYSTAT_INC(in_nomem);
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
return (ENOBUFS);
}
port = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_SPORT];
if (port->sadb_x_nat_t_port_port == 0) {
ipseclog((LOG_DEBUG, "%s: invalid NAT-T sport specified.\n",
__func__));
return (EINVAL);
}
sav->natt->sport = port->sadb_x_nat_t_port_port;
port = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_DPORT];
if (port->sadb_x_nat_t_port_port == 0) {
ipseclog((LOG_DEBUG, "%s: invalid NAT-T dport specified.\n",
__func__));
return (EINVAL);
}
sav->natt->dport = port->sadb_x_nat_t_port_port;
/*
* SADB_X_EXT_NAT_T_OAI and SADB_X_EXT_NAT_T_OAR are optional
* and needed only for transport mode IPsec.
* Usually NAT translates only one address, but it is possible,
* that both addresses could be translated.
* NOTE: Value of SADB_X_EXT_NAT_T_OAI is equal to SADB_X_EXT_NAT_T_OA.
*/
if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_OAI)) {
if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_OAI)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n",
__func__));
return (EINVAL);
}
oai = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI];
} else
oai = NULL;
if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_OAR)) {
if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_OAR)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n",
__func__));
return (EINVAL);
}
oar = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR];
} else
oar = NULL;
/* Initialize addresses only for transport mode */
if (sav->sah->saidx.mode != IPSEC_MODE_TUNNEL) {
cksum = 0;
if (oai != NULL) {
/* Currently we support only AF_INET */
sa = (struct sockaddr *)(oai + 1);
if (sa->sa_family != AF_INET ||
sa->sa_len != sizeof(struct sockaddr_in)) {
ipseclog((LOG_DEBUG,
"%s: wrong NAT-OAi header.\n",
__func__));
return (EINVAL);
}
/* Ignore address if it the same */
if (((struct sockaddr_in *)sa)->sin_addr.s_addr !=
sav->sah->saidx.src.sin.sin_addr.s_addr) {
bcopy(sa, &sav->natt->oai.sa, sa->sa_len);
sav->natt->flags |= IPSEC_NATT_F_OAI;
/* Calculate checksum delta */
addr = sav->sah->saidx.src.sin.sin_addr.s_addr;
cksum = in_addword(cksum, ~addr >> 16);
cksum = in_addword(cksum, ~addr & 0xffff);
addr = sav->natt->oai.sin.sin_addr.s_addr;
cksum = in_addword(cksum, addr >> 16);
cksum = in_addword(cksum, addr & 0xffff);
}
}
if (oar != NULL) {
/* Currently we support only AF_INET */
sa = (struct sockaddr *)(oar + 1);
if (sa->sa_family != AF_INET ||
sa->sa_len != sizeof(struct sockaddr_in)) {
ipseclog((LOG_DEBUG,
"%s: wrong NAT-OAr header.\n",
__func__));
return (EINVAL);
}
/* Ignore address if it the same */
if (((struct sockaddr_in *)sa)->sin_addr.s_addr !=
sav->sah->saidx.dst.sin.sin_addr.s_addr) {
bcopy(sa, &sav->natt->oar.sa, sa->sa_len);
sav->natt->flags |= IPSEC_NATT_F_OAR;
/* Calculate checksum delta */
addr = sav->sah->saidx.dst.sin.sin_addr.s_addr;
cksum = in_addword(cksum, ~addr >> 16);
cksum = in_addword(cksum, ~addr & 0xffff);
addr = sav->natt->oar.sin.sin_addr.s_addr;
cksum = in_addword(cksum, addr >> 16);
cksum = in_addword(cksum, addr & 0xffff);
}
}
sav->natt->cksum = cksum;
}
return (0);
}
static int
key_setident(struct secashead *sah, const struct sadb_msghdr *mhp)
{
const struct sadb_ident *idsrc, *iddst;
int idsrclen, iddstlen;
IPSEC_ASSERT(sah != NULL, ("null secashead"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
/* don't make buffer if not there */
if (SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_SRC) &&
SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_DST)) {
sah->idents = NULL;
sah->identd = NULL;
return (0);
}
if (SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_SRC) ||
SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_DST)) {
ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__));
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, "%s: ident type mismatch.\n", __func__));
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 */
sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
if (sah->idents == NULL) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
return ENOBUFS;
}
sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
if (sah->identd == NULL) {
free(sah->idents, M_IPSEC_MISC);
sah->idents = NULL;
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
return ENOBUFS;
}
sah->idents->type = idsrc->sadb_ident_type;
sah->idents->id = idsrc->sadb_ident_id;
sah->identd->type = iddst->sadb_ident_type;
sah->identd->id = iddst->sadb_ident_id;
return 0;
}
/*
* m will not be freed on return.
* it is caller's responsibility to free the result.
*
* Called from SADB_ADD and SADB_UPDATE. Reply will contain headers
* from the request in defined order.
*/
static struct mbuf *
key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp)
{
struct mbuf *n;
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
/* create new sadb_msg to reply. */
n = key_gather_mbuf(m, mhp, 1, 16, 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,
SADB_X_EXT_NAT_T_TYPE, SADB_X_EXT_NAT_T_SPORT,
SADB_X_EXT_NAT_T_DPORT, SADB_X_EXT_NAT_T_OAI,
SADB_X_EXT_NAT_T_OAR, SADB_X_EXT_NEW_ADDRESS_SRC,
SADB_X_EXT_NEW_ADDRESS_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;
}
/*
* 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(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
struct secasindex saidx;
struct sadb_address *src0, *dst0;
struct secasvar *sav;
struct sadb_sa *sa0;
uint8_t proto;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
__func__));
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]);
if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
(struct sockaddr *)(dst0 + 1)) != 0) {
ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
return (key_senderror(so, m, EINVAL));
}
KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
if (SADB_CHECKHDR(mhp, SADB_EXT_SA)) {
/*
* Caller wants us to delete all non-LARVAL SAs
* that match the src/dst. This is used during
* IKE INITIAL-CONTACT.
* XXXAE: this looks like some extension to RFC2367.
*/
ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__));
return (key_delete_all(so, m, mhp, &saidx));
}
if (SADB_CHECKLEN(mhp, SADB_EXT_SA)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n", __func__));
return (key_senderror(so, m, EINVAL));
}
sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
if (proto == IPPROTO_TCP)
sav = key_getsav_tcpmd5(&saidx, NULL);
else
sav = key_getsavbyspi(sa0->sadb_sa_spi);
if (sav == NULL) {
ipseclog((LOG_DEBUG, "%s: no SA found for SPI %u.\n",
__func__, ntohl(sa0->sadb_sa_spi)));
return (key_senderror(so, m, ESRCH));
}
if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_HEAD) == 0) {
ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u.\n",
__func__, ntohl(sav->spi)));
key_freesav(&sav);
return (key_senderror(so, m, ESRCH));
}
KEYDBG(KEY_STAMP,
printf("%s: SA(%p)\n", __func__, sav));
KEYDBG(KEY_DATA, kdebug_secasv(sav));
key_unlinksav(sav);
key_freesav(&sav);
{
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(struct socket *so, struct mbuf *m,
const struct sadb_msghdr *mhp, struct secasindex *saidx)
{
struct secasvar_queue drainq;
struct secashead *sah;
struct secasvar *sav, *nextsav;
TAILQ_INIT(&drainq);
SAHTREE_WLOCK();
LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
if (key_cmpsaidx(&sah->saidx, saidx, CMP_HEAD) == 0)
continue;
/* Move all ALIVE SAs into drainq */
TAILQ_CONCAT(&drainq, &sah->savtree_alive, chain);
}
/* Unlink all queued SAs from SPI hash */
TAILQ_FOREACH(sav, &drainq, chain) {
sav->state = SADB_SASTATE_DEAD;
LIST_REMOVE(sav, spihash);
}
SAHTREE_WUNLOCK();
/* Now we can release reference for all SAs in drainq */
sav = TAILQ_FIRST(&drainq);
while (sav != NULL) {
KEYDBG(KEY_STAMP,
printf("%s: SA(%p)\n", __func__, sav));
KEYDBG(KEY_DATA, kdebug_secasv(sav));
nextsav = TAILQ_NEXT(sav, chain);
key_freesah(&sav->sah); /* release reference from SAV */
key_freesav(&sav); /* release last reference */
sav = nextsav;
}
{
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);
}
}
/*
* Delete all alive SAs for corresponding xform.
* Larval SAs have not initialized tdb_xform, so it is safe to leave them
* here when xform disappears.
*/
static void
key_delete_xform(const struct xformsw *xsp)
{
struct secasvar_queue drainq;
struct secashead *sah;
struct secasvar *sav, *nextsav;
TAILQ_INIT(&drainq);
SAHTREE_WLOCK();
TAILQ_FOREACH(sah, &V_sahtree, chain) {
sav = TAILQ_FIRST(&sah->savtree_alive);
if (sav == NULL)
continue;
if (sav->tdb_xform != xsp)
continue;
/*
* It is supposed that all SAs in the chain are related to
* one xform.
*/
TAILQ_CONCAT(&drainq, &sah->savtree_alive, chain);
}
/* Unlink all queued SAs from SPI hash */
TAILQ_FOREACH(sav, &drainq, chain) {
sav->state = SADB_SASTATE_DEAD;
LIST_REMOVE(sav, spihash);
}
SAHTREE_WUNLOCK();
/* Now we can release reference for all SAs in drainq */
sav = TAILQ_FIRST(&drainq);
while (sav != NULL) {
KEYDBG(KEY_STAMP,
printf("%s: SA(%p)\n", __func__, sav));
KEYDBG(KEY_DATA, kdebug_secasv(sav));
nextsav = TAILQ_NEXT(sav, chain);
key_freesah(&sav->sah); /* release reference from SAV */
key_freesav(&sav); /* release last reference */
sav = nextsav;
}
}
/*
* 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(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
struct secasindex saidx;
struct sadb_address *src0, *dst0;
struct sadb_sa *sa0;
struct secasvar *sav;
uint8_t proto;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: missing required header.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n", __func__));
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];
if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
(struct sockaddr *)(dst0 + 1)) != 0) {
ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
return key_senderror(so, m, EINVAL);
}
KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
if (proto == IPPROTO_TCP)
sav = key_getsav_tcpmd5(&saidx, NULL);
else
sav = key_getsavbyspi(sa0->sadb_sa_spi);
if (sav == NULL) {
ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__));
return key_senderror(so, m, ESRCH);
}
if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_HEAD) == 0) {
ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u.\n",
__func__, ntohl(sa0->sadb_sa_spi)));
key_freesav(&sav);
return (key_senderror(so, m, ESRCH));
}
{
struct mbuf *n;
uint8_t satype;
/* map proto to satype */
if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0) {
ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n",
__func__));
key_freesav(&sav);
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);
key_freesav(&sav);
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(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_soft_addtime * 80 / 100;
comb->sadb_comb_soft_usetime = 28800; /* 8 hours */
comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100;
}
/*
* XXX reorder combinations by preference
* XXX no idea if the user wants ESP authentication or not
*/
static struct mbuf *
key_getcomb_ealg(void)
{
struct sadb_comb *comb;
const struct enc_xform *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 = enc_algorithm_lookup(i);
if (algo == NULL)
continue;
/* discard algorithms with key size smaller than system min */
if (_BITS(algo->maxkey) < V_ipsec_esp_keymin)
continue;
if (_BITS(algo->minkey) < V_ipsec_esp_keymin)
encmin = V_ipsec_esp_keymin;
else
encmin = _BITS(algo->minkey);
if (V_ipsec_esp_auth)
m = key_getcomb_ah();
else {
IPSEC_ASSERT(l <= MLEN,
("l=%u > MLEN=%lu", l, (u_long) MLEN));
MGET(m, M_NOWAIT, 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;
IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l));
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 = _BITS(algo->maxkey);
}
if (!result)
result = m;
else
m_cat(result, m);
}
return result;
fail:
if (result)
m_freem(result);
return NULL;
}
static void
key_getsizes_ah(const struct auth_hash *ah, int alg, u_int16_t* min,
u_int16_t* max)
{
*min = *max = ah->keysize;
if (ah->keysize == 0) {
/*
* Transform takes arbitrary key size but algorithm
* key size is restricted. Enforce this here.
*/
switch (alg) {
case SADB_X_AALG_MD5: *min = *max = 16; break;
case SADB_X_AALG_SHA: *min = *max = 20; break;
case SADB_X_AALG_NULL: *min = 1; *max = 256; break;
case SADB_X_AALG_SHA2_256: *min = *max = 32; break;
case SADB_X_AALG_SHA2_384: *min = *max = 48; break;
case SADB_X_AALG_SHA2_512: *min = *max = 64; break;
default:
DPRINTF(("%s: unknown AH algorithm %u\n",
__func__, alg));
break;
}
}
}
/*
* XXX reorder combinations by preference
*/
static struct mbuf *
key_getcomb_ah()
{
const struct auth_hash *algo;
struct sadb_comb *comb;
struct mbuf *m;
u_int16_t minkeysize, maxkeysize;
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 &&
i != SADB_X_AALG_SHA2_256 &&
i != SADB_X_AALG_SHA2_384 &&
i != SADB_X_AALG_SHA2_512)
continue;
#endif
algo = auth_algorithm_lookup(i);
if (!algo)
continue;
key_getsizes_ah(algo, i, &minkeysize, &maxkeysize);
/* discard algorithms with key size smaller than system min */
if (_BITS(minkeysize) < V_ipsec_ah_keymin)
continue;
if (!m) {
IPSEC_ASSERT(l <= MLEN,
("l=%u > MLEN=%lu", l, (u_long) MLEN));
MGET(m, M_NOWAIT, MT_DATA);
if (m) {
M_ALIGN(m, l);
m->m_len = l;
m->m_next = NULL;
}
} else
M_PREPEND(m, l, M_NOWAIT);
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 = _BITS(minkeysize);
comb->sadb_comb_auth_maxbits = _BITS(maxkeysize);
}
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()
{
const struct comp_algo *algo;
struct sadb_comb *comb;
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 = comp_algorithm_lookup(i);
if (!algo)
continue;
if (!m) {
IPSEC_ASSERT(l <= MLEN,
("l=%u > MLEN=%lu", l, (u_long) MLEN));
MGET(m, M_NOWAIT, MT_DATA);
if (m) {
M_ALIGN(m, l);
m->m_len = l;
m->m_next = NULL;
}
} else
M_PREPEND(m, l, M_NOWAIT);
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(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) {
case IPPROTO_ESP:
m = key_getcomb_ealg();
break;
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_NOWAIT);
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 occurred,
* 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(const struct secasindex *saidx, struct secpolicy *sp)
{
union sockaddr_union addr;
struct mbuf *result, *m;
uint32_t seq;
int error;
uint16_t ul_proto;
uint8_t mask, satype;
IPSEC_ASSERT(saidx != NULL, ("null saidx"));
satype = key_proto2satype(saidx->proto);
IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto));
error = -1;
result = NULL;
ul_proto = IPSEC_ULPROTO_ANY;
/* Get seq number to check whether sending message or not. */
seq = key_getacq(saidx, &error);
if (seq == 0)
return (error);
m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0);
if (!m) {
error = ENOBUFS;
goto fail;
}
result = m;
/*
* set sadb_address for saidx's.
*
* Note that if sp is supplied, then we're being called from
* key_allocsa_policy() and should supply port and protocol
* information.
* XXXAE: why only TCP and UDP? ICMP and SCTP looks applicable too.
* XXXAE: probably we can handle this in the ipsec[46]_allocsa().
* XXXAE: it looks like we should save this info in the ACQ entry.
*/
if (sp != NULL && (sp->spidx.ul_proto == IPPROTO_TCP ||
sp->spidx.ul_proto == IPPROTO_UDP))
ul_proto = sp->spidx.ul_proto;
addr = saidx->src;
mask = FULLMASK;
if (ul_proto != IPSEC_ULPROTO_ANY) {
switch (sp->spidx.src.sa.sa_family) {
case AF_INET:
if (sp->spidx.src.sin.sin_port != IPSEC_PORT_ANY) {
addr.sin.sin_port = sp->spidx.src.sin.sin_port;
mask = sp->spidx.prefs;
}
break;
case AF_INET6:
if (sp->spidx.src.sin6.sin6_port != IPSEC_PORT_ANY) {
addr.sin6.sin6_port =
sp->spidx.src.sin6.sin6_port;
mask = sp->spidx.prefs;
}
break;
default:
break;
}
}
m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &addr.sa, mask, ul_proto);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
addr = saidx->dst;
mask = FULLMASK;
if (ul_proto != IPSEC_ULPROTO_ANY) {
switch (sp->spidx.dst.sa.sa_family) {
case AF_INET:
if (sp->spidx.dst.sin.sin_port != IPSEC_PORT_ANY) {
addr.sin.sin_port = sp->spidx.dst.sin.sin_port;
mask = sp->spidx.prefd;
}
break;
case AF_INET6:
if (sp->spidx.dst.sin6.sin6_port != IPSEC_PORT_ANY) {
addr.sin6.sin6_port =
sp->spidx.dst.sin6.sin6_port;
mask = sp->spidx.prefd;
}
break;
default:
break;
}
}
m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &addr.sa, mask, ul_proto);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
/* XXX proxy address (optional) */
/* set sadb_x_policy */
if (sp != NULL) {
m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id,
sp->priority);
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);
KEYDBG(KEY_STAMP,
printf("%s: SP(%p)\n", __func__, sp));
KEYDBG(KEY_DATA, kdebug_secasindex(saidx, NULL));
return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
fail:
if (result)
m_freem(result);
return error;
}
static uint32_t
key_newacq(const struct secasindex *saidx, int *perror)
{
struct secacq *acq;
uint32_t seq;
acq = malloc(sizeof(*acq), M_IPSEC_SAQ, M_NOWAIT | M_ZERO);
if (acq == NULL) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
*perror = ENOBUFS;
return (0);
}
/* copy secindex */
bcopy(saidx, &acq->saidx, sizeof(acq->saidx));
acq->created = time_second;
acq->count = 0;
/* add to acqtree */
ACQ_LOCK();
seq = acq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq);
LIST_INSERT_HEAD(&V_acqtree, acq, chain);
LIST_INSERT_HEAD(ACQADDRHASH_HASH(saidx), acq, addrhash);
LIST_INSERT_HEAD(ACQSEQHASH_HASH(seq), acq, seqhash);
ACQ_UNLOCK();
*perror = 0;
return (seq);
}
static uint32_t
key_getacq(const struct secasindex *saidx, int *perror)
{
struct secacq *acq;
uint32_t seq;
ACQ_LOCK();
LIST_FOREACH(acq, ACQADDRHASH_HASH(saidx), addrhash) {
if (key_cmpsaidx(&acq->saidx, saidx, CMP_EXACTLY)) {
if (acq->count > V_key_blockacq_count) {
/*
* Reset counter and send message.
* Also reset created time to keep ACQ for
* this saidx.
*/
acq->created = time_second;
acq->count = 0;
seq = acq->seq;
} else {
/*
* Increment counter and do nothing.
* We send SADB_ACQUIRE message only
* for each V_key_blockacq_count packet.
*/
acq->count++;
seq = 0;
}
break;
}
}
ACQ_UNLOCK();
if (acq != NULL) {
*perror = 0;
return (seq);
}
/* allocate new entry */
return (key_newacq(saidx, perror));
}
static int
key_acqreset(uint32_t seq)
{
struct secacq *acq;
ACQ_LOCK();
LIST_FOREACH(acq, ACQSEQHASH_HASH(seq), seqhash) {
if (acq->seq == seq) {
acq->count = 0;
acq->created = time_second;
break;
}
}
ACQ_UNLOCK();
if (acq == NULL)
return (ESRCH);
return (0);
}
/*
* Mark ACQ entry as stale to remove it in key_flush_acq().
* Called after successful SADB_GETSPI message.
*/
static int
key_acqdone(const struct secasindex *saidx, uint32_t seq)
{
struct secacq *acq;
ACQ_LOCK();
LIST_FOREACH(acq, ACQSEQHASH_HASH(seq), seqhash) {
if (acq->seq == seq)
break;
}
if (acq != NULL) {
if (key_cmpsaidx(&acq->saidx, saidx, CMP_EXACTLY) == 0) {
ipseclog((LOG_DEBUG,
"%s: Mismatched saidx for ACQ %u", __func__, seq));
acq = NULL;
} else {
acq->created = 0;
}
} else {
ipseclog((LOG_DEBUG,
"%s: ACQ %u is not found.", __func__, seq));
}
ACQ_UNLOCK();
if (acq == NULL)
return (ESRCH);
return (0);
}
static struct secspacq *
key_newspacq(struct secpolicyindex *spidx)
{
struct secspacq *acq;
/* get new entry */
acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO);
if (acq == NULL) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
return NULL;
}
/* copy secindex */
bcopy(spidx, &acq->spidx, sizeof(acq->spidx));
acq->created = time_second;
acq->count = 0;
/* add to spacqtree */
SPACQ_LOCK();
LIST_INSERT_HEAD(&V_spacqtree, acq, chain);
SPACQ_UNLOCK();
return acq;
}
static struct secspacq *
key_getspacq(struct secpolicyindex *spidx)
{
struct secspacq *acq;
SPACQ_LOCK();
LIST_FOREACH(acq, &V_spacqtree, chain) {
if (key_cmpspidx_exactly(spidx, &acq->spidx)) {
/* NB: return holding spacq_lock */
return acq;
}
}
SPACQ_UNLOCK();
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(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
SAHTREE_RLOCK_TRACKER;
struct sadb_address *src0, *dst0;
struct secasindex saidx;
struct secashead *sah;
uint32_t reqid;
int error;
uint8_t mode, proto;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
/*
* Error message from KMd.
* We assume that if error was occurred in IKEd, the length of PFKEY
* message is equal to the size of sadb_msg structure.
* We do not raise error even if error occurred in this function.
*/
if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) {
/* check sequence number */
if (mhp->msg->sadb_msg_seq == 0 ||
mhp->msg->sadb_msg_errno == 0) {
ipseclog((LOG_DEBUG, "%s: must specify sequence "
"number and errno.\n", __func__));
} else {
/*
* IKEd reported that error occurred.
* XXXAE: what it expects from the kernel?
* Probably we should send SADB_ACQUIRE again?
* If so, reset ACQ's state.
* XXXAE: it looks useless.
*/
key_acqreset(mhp->msg->sadb_msg_seq);
}
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, "%s: invalid satype is passed.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
SADB_CHECKHDR(mhp, SADB_EXT_PROPOSAL)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: missing required header.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
SADB_CHECKLEN(mhp, SADB_EXT_PROPOSAL)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n", __func__));
return key_senderror(so, m, EINVAL);
}
if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
mode = IPSEC_MODE_ANY;
reqid = 0;
} else {
if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
ipseclog((LOG_DEBUG,
"%s: invalid message: wrong header size.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
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;
}
src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
(struct sockaddr *)(dst0 + 1));
if (error != 0) {
ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
return key_senderror(so, m, EINVAL);
}
KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
/* get a SA index */
SAHTREE_RLOCK();
LIST_FOREACH(sah, SAHADDRHASH_HASH(&saidx), addrhash) {
if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID))
break;
}
SAHTREE_RUNLOCK();
if (sah != NULL) {
ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__));
return key_senderror(so, m, EEXIST);
}
error = key_acquire(&saidx, NULL);
if (error != 0) {
ipseclog((LOG_DEBUG,
"%s: error %d returned from key_acquire()\n",
__func__, error));
return key_senderror(so, m, error);
}
m_freem(m);
return (0);
}
/*
* 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(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
struct secreg *reg, *newreg = NULL;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
/* check for invalid register message */
if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_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 */
REGTREE_LOCK();
LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) {
if (reg->so == so) {
REGTREE_UNLOCK();
ipseclog((LOG_DEBUG, "%s: socket exists already.\n",
__func__));
return key_senderror(so, m, EEXIST);
}
}
/* create regnode */
newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO);
if (newreg == NULL) {
REGTREE_UNLOCK();
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
return key_senderror(so, m, ENOBUFS);
}
newreg->so = so;
((struct keycb *)sotorawcb(so))->kp_registered++;
/* add regnode to regtree. */
LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain);
REGTREE_UNLOCK();
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 (auth_algorithm_lookup(i))
alen += sizeof(struct sadb_alg);
}
if (alen)
alen += sizeof(struct sadb_supported);
elen = 0;
for (i = 1; i <= SADB_EALG_MAX; i++) {
if (enc_algorithm_lookup(i))
elen += sizeof(struct sadb_alg);
}
if (elen)
elen += sizeof(struct sadb_supported);
len = sizeof(struct sadb_msg) + alen + elen;
if (len > MCLBYTES)
return key_senderror(so, m, ENOBUFS);
MGETHDR(n, M_NOWAIT, MT_DATA);
if (len > MHLEN) {
if (!(MCLGET(n, M_NOWAIT))) {
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 auth_hash *aalgo;
u_int16_t minkeysize, maxkeysize;
aalgo = auth_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;
key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize);
alg->sadb_alg_minbits = _BITS(minkeysize);
alg->sadb_alg_maxbits = _BITS(maxkeysize);
off += PFKEY_ALIGN8(sizeof(*alg));
}
}
/* 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 enc_xform *ealgo;
ealgo = enc_algorithm_lookup(i);
if (!ealgo)
continue;
alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
alg->sadb_alg_id = i;
alg->sadb_alg_ivlen = ealgo->ivsize;
alg->sadb_alg_minbits = _BITS(ealgo->minkey);
alg->sadb_alg_maxbits = _BITS(ealgo->maxkey);
off += PFKEY_ALIGN8(sizeof(struct sadb_alg));
}
}
IPSEC_ASSERT(off == len,
("length assumption failed (off %u len %u)", off, len));
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(struct socket *so)
{
struct secreg *reg;
int i;
IPSEC_ASSERT(so != NULL, ("NULL so"));
/*
* 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.
*/
REGTREE_LOCK();
for (i = 0; i <= SADB_SATYPE_MAX; i++) {
LIST_FOREACH(reg, &V_regtree[i], chain) {
if (reg->so == so && __LIST_CHAINED(reg)) {
LIST_REMOVE(reg, chain);
free(reg, M_IPSEC_SAR);
break;
}
}
}
REGTREE_UNLOCK();
}
/*
* 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(struct secasvar *sav, int hard)
{
struct mbuf *result = NULL, *m;
struct sadb_lifetime *lt;
uint32_t replay_count;
int error, len;
uint8_t satype;
IPSEC_ASSERT (sav != NULL, ("null sav"));
IPSEC_ASSERT (sav->sah != NULL, ("null sa header"));
KEYDBG(KEY_STAMP,
printf("%s: SA(%p) expired %s lifetime\n", __func__,
sav, hard ? "hard": "soft"));
KEYDBG(KEY_DATA, kdebug_secasv(sav));
/* set msg header */
satype = key_proto2satype(sav->sah->saidx.proto);
IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype));
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 */
SECASVAR_LOCK(sav);
replay_count = sav->replay ? sav->replay->count : 0;
SECASVAR_UNLOCK(sav);
m = key_setsadbxsa2(sav->sah->saidx.mode, replay_count,
sav->sah->saidx.reqid);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
if (sav->replay && sav->replay->wsize > UINT8_MAX) {
m = key_setsadbxsareplay(sav->replay->wsize);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
}
/* create lifetime extension (current and soft) */
len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
m = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (m == NULL) {
error = ENOBUFS;
goto fail;
}
m_align(m, len);
m->m_len = len;
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 =
(uint32_t)counter_u64_fetch(sav->lft_c_allocations);
lt->sadb_lifetime_bytes =
counter_u64_fetch(sav->lft_c_bytes);
lt->sadb_lifetime_addtime = sav->created;
lt->sadb_lifetime_usetime = sav->firstused;
lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
if (hard) {
lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
lt->sadb_lifetime_allocations = sav->lft_h->allocations;
lt->sadb_lifetime_bytes = sav->lft_h->bytes;
lt->sadb_lifetime_addtime = sav->lft_h->addtime;
lt->sadb_lifetime_usetime = sav->lft_h->usetime;
} else {
lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
lt->sadb_lifetime_allocations = sav->lft_s->allocations;
lt->sadb_lifetime_bytes = sav->lft_s->bytes;
lt->sadb_lifetime_addtime = sav->lft_s->addtime;
lt->sadb_lifetime_usetime = sav->lft_s->usetime;
}
m_cat(result, m);
/* set sadb_address for source */
m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
&sav->sah->saidx.src.sa,
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,
&sav->sah->saidx.dst.sa,
FULLMASK, IPSEC_ULPROTO_ANY);
if (!m) {
error = ENOBUFS;
goto fail;
}
m_cat(result, m);
/*
* XXX-BZ Handle NAT-T extensions here.
* XXXAE: it doesn't seem quite useful. IKEs should not depend on
* this information, we report only significant SA fields.
*/
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;
}
static void
key_freesah_flushed(struct secashead_queue *flushq)
{
struct secashead *sah, *nextsah;
struct secasvar *sav, *nextsav;
sah = TAILQ_FIRST(flushq);
while (sah != NULL) {
sav = TAILQ_FIRST(&sah->savtree_larval);
while (sav != NULL) {
nextsav = TAILQ_NEXT(sav, chain);
TAILQ_REMOVE(&sah->savtree_larval, sav, chain);
key_freesav(&sav); /* release last reference */
key_freesah(&sah); /* release reference from SAV */
sav = nextsav;
}
sav = TAILQ_FIRST(&sah->savtree_alive);
while (sav != NULL) {
nextsav = TAILQ_NEXT(sav, chain);
TAILQ_REMOVE(&sah->savtree_alive, sav, chain);
key_freesav(&sav); /* release last reference */
key_freesah(&sah); /* release reference from SAV */
sav = nextsav;
}
nextsah = TAILQ_NEXT(sah, chain);
key_freesah(&sah); /* release last reference */
sah = nextsah;
}
}
/*
* 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(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
struct secashead_queue flushq;
struct sadb_msg *newmsg;
struct secashead *sah, *nextsah;
struct secasvar *sav;
uint8_t proto;
int i;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
KEYDBG(KEY_STAMP,
printf("%s: proto %u\n", __func__, proto));
TAILQ_INIT(&flushq);
if (proto == IPSEC_PROTO_ANY) {
/* no SATYPE specified, i.e. flushing all SA. */
SAHTREE_WLOCK();
/* Move all SAHs into flushq */
TAILQ_CONCAT(&flushq, &V_sahtree, chain);
/* Flush all buckets in SPI hash */
for (i = 0; i < V_savhash_mask + 1; i++)
LIST_INIT(&V_savhashtbl[i]);
/* Flush all buckets in SAHADDRHASH */
for (i = 0; i < V_sahaddrhash_mask + 1; i++)
LIST_INIT(&V_sahaddrhashtbl[i]);
/* Mark all SAHs as unlinked */
TAILQ_FOREACH(sah, &flushq, chain) {
sah->state = SADB_SASTATE_DEAD;
/*
* Callout handler makes its job using
* RLOCK and drain queues. In case, when this
* function will be called just before it
* acquires WLOCK, we need to mark SAs as
* unlinked to prevent second unlink.
*/
TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
sav->state = SADB_SASTATE_DEAD;
}
TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
sav->state = SADB_SASTATE_DEAD;
}
}
SAHTREE_WUNLOCK();
} else {
SAHTREE_WLOCK();
sah = TAILQ_FIRST(&V_sahtree);
while (sah != NULL) {
IPSEC_ASSERT(sah->state != SADB_SASTATE_DEAD,
("DEAD SAH %p in SADB_FLUSH", sah));
nextsah = TAILQ_NEXT(sah, chain);
if (sah->saidx.proto != proto) {
sah = nextsah;
continue;
}
sah->state = SADB_SASTATE_DEAD;
TAILQ_REMOVE(&V_sahtree, sah, chain);
LIST_REMOVE(sah, addrhash);
/* Unlink all SAs from SPI hash */
TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
LIST_REMOVE(sav, spihash);
sav->state = SADB_SASTATE_DEAD;
}
TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
LIST_REMOVE(sav, spihash);
sav->state = SADB_SASTATE_DEAD;
}
/* Add SAH into flushq */
TAILQ_INSERT_HEAD(&flushq, sah, chain);
sah = nextsah;
}
SAHTREE_WUNLOCK();
}
key_freesah_flushed(&flushq);
/* Free all queued SAs and SAHs */
if (m->m_len < sizeof(struct sadb_msg) ||
sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
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(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
SAHTREE_RLOCK_TRACKER;
struct secashead *sah;
struct secasvar *sav;
struct sadb_msg *newmsg;
struct mbuf *n;
uint32_t cnt;
uint8_t proto, satype;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
/* map satype to proto */
if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
__func__));
return key_senderror(so, m, EINVAL);
}
/* count sav entries to be sent to the userland. */
cnt = 0;
SAHTREE_RLOCK();
TAILQ_FOREACH(sah, &V_sahtree, chain) {
if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
proto != sah->saidx.proto)
continue;
TAILQ_FOREACH(sav, &sah->savtree_larval, chain)
cnt++;
TAILQ_FOREACH(sav, &sah->savtree_alive, chain)
cnt++;
}
if (cnt == 0) {
SAHTREE_RUNLOCK();
return key_senderror(so, m, ENOENT);
}
/* send this to the userland, one at a time. */
newmsg = NULL;
TAILQ_FOREACH(sah, &V_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) {
SAHTREE_RUNLOCK();
ipseclog((LOG_DEBUG, "%s: there was invalid proto in "
"SAD.\n", __func__));
return key_senderror(so, m, EINVAL);
}
TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
n = key_setdumpsa(sav, SADB_DUMP, satype,
--cnt, mhp->msg->sadb_msg_pid);
if (n == NULL) {
SAHTREE_RUNLOCK();
return key_senderror(so, m, ENOBUFS);
}
key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
}
TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
n = key_setdumpsa(sav, SADB_DUMP, satype,
--cnt, mhp->msg->sadb_msg_pid);
if (n == NULL) {
SAHTREE_RUNLOCK();
return key_senderror(so, m, ENOBUFS);
}
key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
}
}
SAHTREE_RUNLOCK();
m_freem(m);
return (0);
}
/*
* SADB_X_PROMISC processing
*
* m will always be freed.
*/
static int
key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
{
int olen;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
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(struct mbuf *m, struct socket *so)
{
struct sadb_msg *msg;
struct sadb_msghdr mh;
u_int orglen;
int error;
int target;
IPSEC_ASSERT(so != NULL, ("null socket"));
IPSEC_ASSERT(m != NULL, ("null mbuf"));
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 != orglen) {
ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__));
PFKEYSTAT_INC(out_invlen);
error = EINVAL;
goto senderror;
}
if (msg->sadb_msg_version != PF_KEY_V2) {
ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n",
__func__, msg->sadb_msg_version));
PFKEYSTAT_INC(out_invver);
error = EINVAL;
goto senderror;
}
if (msg->sadb_msg_type > SADB_MAX) {
ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
__func__, msg->sadb_msg_type));
PFKEYSTAT_INC(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_NOWAIT, MT_DATA);
if (n && m->m_pkthdr.len > MHLEN) {
if (!(MCLGET(n, M_NOWAIT))) {
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;
/* We use satype as scope mask for spddump */
if (msg->sadb_msg_type == SADB_X_SPDDUMP) {
switch (msg->sadb_msg_satype) {
case IPSEC_POLICYSCOPE_ANY:
case IPSEC_POLICYSCOPE_GLOBAL:
case IPSEC_POLICYSCOPE_IFNET:
case IPSEC_POLICYSCOPE_PCB:
break;
default:
ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
__func__, msg->sadb_msg_type));
PFKEYSTAT_INC(out_invsatype);
error = EINVAL;
goto senderror;
}
} else {
switch (msg->sadb_msg_satype) { /* check SA type */
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, "%s: must specify satype "
"when msg type=%u.\n", __func__,
msg->sadb_msg_type));
PFKEYSTAT_INC(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_SPDFLUSH:
case SADB_X_SPDSETIDX:
case SADB_X_SPDUPDATE:
case SADB_X_SPDDELETE2:
ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
__func__, msg->sadb_msg_type));
PFKEYSTAT_INC(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, "%s: type %u isn't supported.\n",
__func__, msg->sadb_msg_satype));
PFKEYSTAT_INC(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, "%s: invalid type %u is passed.\n",
__func__, msg->sadb_msg_satype));
PFKEYSTAT_INC(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, "%s: upper layer protocol "
"mismatched.\n", __func__));
PFKEYSTAT_INC(out_invaddr);
error = EINVAL;
goto senderror;
}
/* check family */
if (PFKEY_ADDR_SADDR(src0)->sa_family !=
PFKEY_ADDR_SADDR(dst0)->sa_family) {
ipseclog((LOG_DEBUG, "%s: address family mismatched.\n",
__func__));
PFKEYSTAT_INC(out_invaddr);
error = EINVAL;
goto senderror;
}
if (PFKEY_ADDR_SADDR(src0)->sa_len !=
PFKEY_ADDR_SADDR(dst0)->sa_len) {
ipseclog((LOG_DEBUG, "%s: address struct size "
"mismatched.\n", __func__));
PFKEYSTAT_INC(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_INC(out_invaddr);
error = EINVAL;
goto senderror;
}
break;
case AF_INET6:
if (PFKEY_ADDR_SADDR(src0)->sa_len !=
sizeof(struct sockaddr_in6)) {
PFKEYSTAT_INC(out_invaddr);
error = EINVAL;
goto senderror;
}
break;
default:
ipseclog((LOG_DEBUG, "%s: unsupported address family\n",
__func__));
PFKEYSTAT_INC(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, "%s: illegal prefixlen.\n",
__func__));
PFKEYSTAT_INC(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 >= nitems(key_typesw) ||
key_typesw[msg->sadb_msg_type] == NULL) {
PFKEYSTAT_INC(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(struct socket *so, struct mbuf *m, int code)
{
struct sadb_msg *msg;
IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
("mbuf too small, len %u", m->m_len));
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(struct mbuf *m, struct sadb_msghdr *mhp)
{
struct mbuf *n;
struct sadb_ext *ext;
size_t off, end;
int extlen;
int toff;
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
("mbuf too small, len %u", m->m_len));
/* 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:
case SADB_X_EXT_NAT_T_TYPE:
case SADB_X_EXT_NAT_T_SPORT:
case SADB_X_EXT_NAT_T_DPORT:
case SADB_X_EXT_NAT_T_OAI:
case SADB_X_EXT_NAT_T_OAR:
case SADB_X_EXT_NAT_T_FRAG:
case SADB_X_EXT_SA_REPLAY:
case SADB_X_EXT_NEW_ADDRESS_SRC:
case SADB_X_EXT_NEW_ADDRESS_DST:
/* 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, "%s: duplicate ext_type "
"%u\n", __func__, ext->sadb_ext_type));
m_freem(m);
PFKEYSTAT_INC(out_dupext);
return EINVAL;
}
break;
default:
ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n",
__func__, ext->sadb_ext_type));
m_freem(m);
PFKEYSTAT_INC(out_invexttype);
return EINVAL;
}
extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
if (key_validate_ext(ext, extlen)) {
m_freem(m);
PFKEYSTAT_INC(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_INC(out_invlen);
return EINVAL;
}
return 0;
}
static int
key_validate_ext(const struct sadb_ext *ext, int len)
{
const 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 >= nitems(minsize) ||
ext->sadb_ext_type >= nitems(maxsize))
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:
case SADB_X_EXT_NAT_T_OAI:
case SADB_X_EXT_NAT_T_OAR:
case SADB_X_EXT_NEW_ADDRESS_SRC:
case SADB_X_EXT_NEW_ADDRESS_DST:
baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
checktype = ADDR;
break;
case SADB_EXT_IDENTITY_SRC:
case SADB_EXT_IDENTITY_DST:
if (((const 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 = (const struct sockaddr *)(((const u_int8_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(void)
{
int i;
for (i = 0; i < IPSEC_DIR_MAX; i++) {
TAILQ_INIT(&V_sptree[i]);
TAILQ_INIT(&V_sptree_ifnet[i]);
}
V_key_lft_zone = uma_zcreate("IPsec SA lft_c",
sizeof(uint64_t) * 2, NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, UMA_ZONE_PCPU);
TAILQ_INIT(&V_sahtree);
V_sphashtbl = hashinit(SPHASH_NHASH, M_IPSEC_SP, &V_sphash_mask);
V_savhashtbl = hashinit(SAVHASH_NHASH, M_IPSEC_SA, &V_savhash_mask);
V_sahaddrhashtbl = hashinit(SAHHASH_NHASH, M_IPSEC_SAH,
&V_sahaddrhash_mask);
V_acqaddrhashtbl = hashinit(ACQHASH_NHASH, M_IPSEC_SAQ,
&V_acqaddrhash_mask);
V_acqseqhashtbl = hashinit(ACQHASH_NHASH, M_IPSEC_SAQ,
&V_acqseqhash_mask);
for (i = 0; i <= SADB_SATYPE_MAX; i++)
LIST_INIT(&V_regtree[i]);
LIST_INIT(&V_acqtree);
LIST_INIT(&V_spacqtree);
if (!IS_DEFAULT_VNET(curvnet))
return;
XFORMS_LOCK_INIT();
SPTREE_LOCK_INIT();
REGTREE_LOCK_INIT();
SAHTREE_LOCK_INIT();
ACQ_LOCK_INIT();
SPACQ_LOCK_INIT();
#ifndef IPSEC_DEBUG2
callout_init(&key_timer, 1);
callout_reset(&key_timer, hz, key_timehandler, NULL);
#endif /*IPSEC_DEBUG2*/
/* initialize key statistics */
keystat.getspi_count = 1;
if (bootverbose)
printf("IPsec: Initialized Security Association Processing.\n");
}
#ifdef VIMAGE
void
key_destroy(void)
{
struct secashead_queue sahdrainq;
struct secpolicy_queue drainq;
struct secpolicy *sp, *nextsp;
struct secacq *acq, *nextacq;
struct secspacq *spacq, *nextspacq;
struct secashead *sah;
struct secasvar *sav;
struct secreg *reg;
int i;
/*
* XXX: can we just call free() for each object without
* walking through safe way with releasing references?
*/
TAILQ_INIT(&drainq);
SPTREE_WLOCK();
for (i = 0; i < IPSEC_DIR_MAX; i++) {
TAILQ_CONCAT(&drainq, &V_sptree[i], chain);
TAILQ_CONCAT(&drainq, &V_sptree_ifnet[i], chain);
}
SPTREE_WUNLOCK();
sp = TAILQ_FIRST(&drainq);
while (sp != NULL) {
nextsp = TAILQ_NEXT(sp, chain);
key_freesp(&sp);
sp = nextsp;
}
TAILQ_INIT(&sahdrainq);
SAHTREE_WLOCK();
TAILQ_CONCAT(&sahdrainq, &V_sahtree, chain);
for (i = 0; i < V_savhash_mask + 1; i++)
LIST_INIT(&V_savhashtbl[i]);
for (i = 0; i < V_sahaddrhash_mask + 1; i++)
LIST_INIT(&V_sahaddrhashtbl[i]);
TAILQ_FOREACH(sah, &sahdrainq, chain) {
sah->state = SADB_SASTATE_DEAD;
TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
sav->state = SADB_SASTATE_DEAD;
}
TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
sav->state = SADB_SASTATE_DEAD;
}
}
SAHTREE_WUNLOCK();
key_freesah_flushed(&sahdrainq);
hashdestroy(V_sphashtbl, M_IPSEC_SP, V_sphash_mask);
hashdestroy(V_savhashtbl, M_IPSEC_SA, V_savhash_mask);
hashdestroy(V_sahaddrhashtbl, M_IPSEC_SAH, V_sahaddrhash_mask);
REGTREE_LOCK();
for (i = 0; i <= SADB_SATYPE_MAX; i++) {
LIST_FOREACH(reg, &V_regtree[i], chain) {
if (__LIST_CHAINED(reg)) {
LIST_REMOVE(reg, chain);
free(reg, M_IPSEC_SAR);
break;
}
}
}
REGTREE_UNLOCK();
ACQ_LOCK();
acq = LIST_FIRST(&V_acqtree);
while (acq != NULL) {
nextacq = LIST_NEXT(acq, chain);
LIST_REMOVE(acq, chain);
free(acq, M_IPSEC_SAQ);
acq = nextacq;
}
ACQ_UNLOCK();
SPACQ_LOCK();
for (spacq = LIST_FIRST(&V_spacqtree); spacq != NULL;
spacq = nextspacq) {
nextspacq = LIST_NEXT(spacq, chain);
if (__LIST_CHAINED(spacq)) {
LIST_REMOVE(spacq, chain);
free(spacq, M_IPSEC_SAQ);
}
}
SPACQ_UNLOCK();
hashdestroy(V_acqaddrhashtbl, M_IPSEC_SAQ, V_acqaddrhash_mask);
hashdestroy(V_acqseqhashtbl, M_IPSEC_SAQ, V_acqseqhash_mask);
uma_zdestroy(V_key_lft_zone);
}
#endif
/* record data transfer on SA, and update timestamps */
void
key_sa_recordxfer(struct secasvar *sav, struct mbuf *m)
{
IPSEC_ASSERT(sav != NULL, ("Null secasvar"));
IPSEC_ASSERT(m != NULL, ("Null mbuf"));
/*
* XXX Currently, there is a difference of bytes size
* between inbound and outbound processing.
*/
counter_u64_add(sav->lft_c_bytes, m->m_pkthdr.len);
/*
* We use the number of packets as the unit of
* allocations. We increment the variable
* whenever {esp,ah}_{in,out}put is called.
*/
counter_u64_add(sav->lft_c_allocations, 1);
/*
* NOTE: We record CURRENT usetime by using wall clock,
* in seconds. HARD and SOFT lifetime are measured by the time
* difference (again in seconds) from usetime.
*
* usetime
* v expire expire
* -----+-----+--------+---> t
* <--------------> HARD
* <-----> SOFT
*/
if (sav->firstused == 0)
sav->firstused = time_second;
}
/*
* Take one of the kernel's security keys and convert it into a PF_KEY
* structure within an mbuf, suitable for sending up to a waiting
* application in user land.
*
* IN:
* src: A pointer to a kernel security key.
* exttype: Which type of key this is. Refer to the PF_KEY data structures.
* OUT:
* a valid mbuf or NULL indicating an error
*
*/
static struct mbuf *
key_setkey(struct seckey *src, uint16_t exttype)
{
struct mbuf *m;
struct sadb_key *p;
int len;
if (src == NULL)
return NULL;
len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src));
m = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (m == NULL)
return NULL;
m_align(m, len);
m->m_len = len;
p = mtod(m, struct sadb_key *);
bzero(p, len);
p->sadb_key_len = PFKEY_UNIT64(len);
p->sadb_key_exttype = exttype;
p->sadb_key_bits = src->bits;
bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src));
return m;
}
/*
* Take one of the kernel's lifetime data structures and convert it
* into a PF_KEY structure within an mbuf, suitable for sending up to
* a waiting application in user land.
*
* IN:
* src: A pointer to a kernel lifetime structure.
* exttype: Which type of lifetime this is. Refer to the PF_KEY
* data structures for more information.
* OUT:
* a valid mbuf or NULL indicating an error
*
*/
static struct mbuf *
key_setlifetime(struct seclifetime *src, uint16_t exttype)
{
struct mbuf *m = NULL;
struct sadb_lifetime *p;
int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime));
if (src == NULL)
return NULL;
m = m_get2(len, M_NOWAIT, MT_DATA, 0);
if (m == NULL)
return m;
m_align(m, len);
m->m_len = len;
p = mtod(m, struct sadb_lifetime *);
bzero(p, len);
p->sadb_lifetime_len = PFKEY_UNIT64(len);
p->sadb_lifetime_exttype = exttype;
p->sadb_lifetime_allocations = src->allocations;
p->sadb_lifetime_bytes = src->bytes;
p->sadb_lifetime_addtime = src->addtime;
p->sadb_lifetime_usetime = src->usetime;
return m;
}
const struct enc_xform *
enc_algorithm_lookup(int alg)
{
int i;
for (i = 0; i < nitems(supported_ealgs); i++)
if (alg == supported_ealgs[i].sadb_alg)
return (supported_ealgs[i].xform);
return (NULL);
}
const struct auth_hash *
auth_algorithm_lookup(int alg)
{
int i;
for (i = 0; i < nitems(supported_aalgs); i++)
if (alg == supported_aalgs[i].sadb_alg)
return (supported_aalgs[i].xform);
return (NULL);
}
const struct comp_algo *
comp_algorithm_lookup(int alg)
{
int i;
for (i = 0; i < nitems(supported_calgs); i++)
if (alg == supported_calgs[i].sadb_alg)
return (supported_calgs[i].xform);
return (NULL);
}
/*
* Register a transform.
*/
static int
xform_register(struct xformsw* xsp)
{
struct xformsw *entry;
XFORMS_LOCK();
LIST_FOREACH(entry, &xforms, chain) {
if (entry->xf_type == xsp->xf_type) {
XFORMS_UNLOCK();
return (EEXIST);
}
}
LIST_INSERT_HEAD(&xforms, xsp, chain);
XFORMS_UNLOCK();
return (0);
}
void
xform_attach(void *data)
{
struct xformsw *xsp = (struct xformsw *)data;
if (xform_register(xsp) != 0)
printf("%s: failed to register %s xform\n", __func__,
xsp->xf_name);
}
void
xform_detach(void *data)
{
struct xformsw *xsp = (struct xformsw *)data;
XFORMS_LOCK();
LIST_REMOVE(xsp, chain);
XFORMS_UNLOCK();
/* Delete all SAs related to this xform. */
key_delete_xform(xsp);
}
/*
* Initialize transform support in an sav.
*/
static int
xform_init(struct secasvar *sav, u_short xftype)
{
struct xformsw *entry;
int ret;
IPSEC_ASSERT(sav->tdb_xform == NULL,
("tdb_xform is already initialized"));
ret = EINVAL;
XFORMS_LOCK();
LIST_FOREACH(entry, &xforms, chain) {
if (entry->xf_type == xftype) {
ret = (*entry->xf_init)(sav, entry);
break;
}
}
XFORMS_UNLOCK();
return (ret);
}
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