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freebsd-dev/sys/netipsec/ipsec.c
Andrey V. Elsukov fcf596178b Merge projects/ipsec into head/. 
Small summary
 -------------

o Almost all IPsec releated code was moved into sys/netipsec.
o New kernel modules added: ipsec.ko and tcpmd5.ko. New kernel
  option IPSEC_SUPPORT added. It enables support for loading
  and unloading of ipsec.ko and tcpmd5.ko kernel modules.
o IPSEC_NAT_T option was removed. Now NAT-T support is enabled by
  default. The UDP_ENCAP_ESPINUDP_NON_IKE encapsulation type
  support was removed. Added TCP/UDP checksum handling for
  inbound packets that were decapsulated by transport mode SAs.
  setkey(8) modified to show run-time NAT-T configuration of SA.
o New network pseudo interface if_ipsec(4) added. For now it is
  build as part of ipsec.ko module (or with IPSEC kernel).
  It implements IPsec virtual tunnels to create route-based VPNs.
o The network stack now invokes IPsec functions using special
  methods. The only one header file <netipsec/ipsec_support.h>
  should be included to declare all the needed things to work
  with IPsec.
o All IPsec protocols handlers (ESP/AH/IPCOMP protosw) were removed.
  Now these protocols are handled directly via IPsec methods.
o TCP_SIGNATURE support was reworked to be more close to RFC.
o PF_KEY SADB was reworked:
  - now all security associations stored in the single SPI namespace,
    and all SAs MUST have unique SPI.
  - several hash tables added to speed up lookups in SADB.
  - SADB now uses rmlock to protect access, and concurrent threads
    can do SA lookups in the same time.
  - many PF_KEY message handlers were reworked to reflect changes
    in SADB.
  - SADB_UPDATE message was extended to support new PF_KEY headers:
    SADB_X_EXT_NEW_ADDRESS_SRC and SADB_X_EXT_NEW_ADDRESS_DST. They
    can be used by IKE daemon to change SA addresses.
o ipsecrequest and secpolicy structures were cardinally changed to
  avoid locking protection for ipsecrequest. Now we support
  only limited number (4) of bundled SAs, but they are supported
  for both INET and INET6.
o INPCB security policy cache was introduced. Each PCB now caches
  used security policies to avoid SP lookup for each packet.
o For inbound security policies added the mode, when the kernel does
  check for full history of applied IPsec transforms.
o References counting rules for security policies and security
  associations were changed. The proper SA locking added into xform
  code.
o xform code was also changed. Now it is possible to unregister xforms.
  tdb_xxx structures were changed and renamed to reflect changes in
  SADB/SPDB, and changed rules for locking and refcounting.

Reviewed by:	gnn, wblock
Obtained from:	Yandex LLC
Relnotes:	yes
Sponsored by:	Yandex LLC
Differential Revision:	https://reviews.freebsd.org/D9352
2017-02-06 08:49:57 +00:00

1394 lines
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/* $FreeBSD$ */
/* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 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.
*/
/*
* IPsec controller part.
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/priv.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/hhook.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <net/if.h>
#include <net/if_enc.h>
#include <net/if_var.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip6.h>
#ifdef INET6
#include <netinet6/ip6_var.h>
#endif
#include <netinet/in_pcb.h>
#ifdef INET6
#include <netinet/icmp6.h>
#endif
#include <sys/types.h>
#include <netipsec/ipsec.h>
#ifdef INET6
#include <netipsec/ipsec6.h>
#endif
#include <netipsec/ah_var.h>
#include <netipsec/esp_var.h>
#include <netipsec/ipcomp.h> /*XXX*/
#include <netipsec/ipcomp_var.h>
#include <netipsec/ipsec_support.h>
#include <netipsec/key.h>
#include <netipsec/keydb.h>
#include <netipsec/key_debug.h>
#include <netipsec/xform.h>
#include <machine/in_cksum.h>
#include <opencrypto/cryptodev.h>
/* NB: name changed so netstat doesn't use it. */
VNET_PCPUSTAT_DEFINE(struct ipsecstat, ipsec4stat);
VNET_PCPUSTAT_SYSINIT(ipsec4stat);
#ifdef VIMAGE
VNET_PCPUSTAT_SYSUNINIT(ipsec4stat);
#endif /* VIMAGE */
VNET_DEFINE(int, ip4_ah_offsetmask) = 0; /* maybe IP_DF? */
/* DF bit on encap. 0: clear 1: set 2: copy */
VNET_DEFINE(int, ip4_ipsec_dfbit) = 0;
VNET_DEFINE(int, ip4_esp_trans_deflev) = IPSEC_LEVEL_USE;
VNET_DEFINE(int, ip4_esp_net_deflev) = IPSEC_LEVEL_USE;
VNET_DEFINE(int, ip4_ah_trans_deflev) = IPSEC_LEVEL_USE;
VNET_DEFINE(int, ip4_ah_net_deflev) = IPSEC_LEVEL_USE;
/* ECN ignore(-1)/forbidden(0)/allowed(1) */
VNET_DEFINE(int, ip4_ipsec_ecn) = 0;
VNET_DEFINE(int, ip4_esp_randpad) = -1;
static VNET_DEFINE(int, ip4_filtertunnel) = 0;
#define V_ip4_filtertunnel VNET(ip4_filtertunnel)
static VNET_DEFINE(int, check_policy_history) = 0;
#define V_check_policy_history VNET(check_policy_history)
static VNET_DEFINE(struct secpolicy *, def_policy) = NULL;
#define V_def_policy VNET(def_policy)
static int
sysctl_def_policy(SYSCTL_HANDLER_ARGS)
{
int error, value;
value = V_def_policy->policy;
error = sysctl_handle_int(oidp, &value, 0, req);
if (error == 0) {
if (value != IPSEC_POLICY_DISCARD &&
value != IPSEC_POLICY_NONE)
return (EINVAL);
V_def_policy->policy = value;
}
return (error);
}
/*
* Crypto support requirements:
*
* 1 require hardware support
* -1 require software support
* 0 take anything
*/
VNET_DEFINE(int, crypto_support) = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
/*
* TCP/UDP checksum handling policy for transport mode NAT-T (RFC3948)
*
* 0 - auto: incrementally recompute, when checksum delta is known;
* if checksum delta isn't known, reset checksum to zero for UDP,
* and mark csum_flags as valid for TCP.
* 1 - fully recompute TCP/UDP checksum.
*/
VNET_DEFINE(int, natt_cksum_policy) = 0;
FEATURE(ipsec, "Internet Protocol Security (IPsec)");
FEATURE(ipsec_natt, "UDP Encapsulation of IPsec ESP Packets ('NAT-T')");
SYSCTL_DECL(_net_inet_ipsec);
/* net.inet.ipsec */
SYSCTL_PROC(_net_inet_ipsec, IPSECCTL_DEF_POLICY, def_policy,
CTLTYPE_INT | CTLFLAG_VNET | CTLFLAG_RW, 0, 0, sysctl_def_policy, "I",
"IPsec default policy.");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip4_esp_trans_deflev), 0,
"Default ESP transport mode level");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip4_esp_net_deflev), 0,
"Default ESP tunnel mode level.");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip4_ah_trans_deflev), 0,
"AH transfer mode default level.");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip4_ah_net_deflev), 0,
"AH tunnel mode default level.");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, ah_cleartos,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ah_cleartos), 0,
"If set, clear type-of-service field when doing AH computation.");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, ah_offsetmask,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip4_ah_offsetmask), 0,
"If not set, clear offset field mask when doing AH computation.");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, dfbit,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip4_ipsec_dfbit), 0,
"Do not fragment bit on encap.");
SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, ecn,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip4_ipsec_ecn), 0,
"Explicit Congestion Notification handling.");
SYSCTL_INT(_net_inet_ipsec, OID_AUTO, crypto_support,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(crypto_support), 0,
"Crypto driver selection.");
SYSCTL_INT(_net_inet_ipsec, OID_AUTO, check_policy_history,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(check_policy_history), 0,
"Use strict check of inbound packets to security policy compliance.");
SYSCTL_INT(_net_inet_ipsec, OID_AUTO, natt_cksum_policy,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(natt_cksum_policy), 0,
"Method to fix TCP/UDP checksum for transport mode IPsec after NAT.");
SYSCTL_INT(_net_inet_ipsec, OID_AUTO, filtertunnel,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip4_filtertunnel), 0,
"If set, filter packets from an IPsec tunnel.");
SYSCTL_VNET_PCPUSTAT(_net_inet_ipsec, OID_AUTO, ipsecstats, struct ipsecstat,
ipsec4stat, "IPsec IPv4 statistics.");
#ifdef REGRESSION
/*
* When set to 1, IPsec will send packets with the same sequence number.
* This allows to verify if the other side has proper replay attacks detection.
*/
VNET_DEFINE(int, ipsec_replay) = 0;
SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_replay), 0,
"Emulate replay attack");
/*
* When set 1, IPsec will send packets with corrupted HMAC.
* This allows to verify if the other side properly detects modified packets.
*/
VNET_DEFINE(int, ipsec_integrity) = 0;
SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_integrity), 0,
"Emulate man-in-the-middle attack");
#endif
#ifdef INET6
VNET_PCPUSTAT_DEFINE(struct ipsecstat, ipsec6stat);
VNET_PCPUSTAT_SYSINIT(ipsec6stat);
#ifdef VIMAGE
VNET_PCPUSTAT_SYSUNINIT(ipsec6stat);
#endif /* VIMAGE */
VNET_DEFINE(int, ip6_esp_trans_deflev) = IPSEC_LEVEL_USE;
VNET_DEFINE(int, ip6_esp_net_deflev) = IPSEC_LEVEL_USE;
VNET_DEFINE(int, ip6_ah_trans_deflev) = IPSEC_LEVEL_USE;
VNET_DEFINE(int, ip6_ah_net_deflev) = IPSEC_LEVEL_USE;
VNET_DEFINE(int, ip6_ipsec_ecn) = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
static VNET_DEFINE(int, ip6_filtertunnel) = 0;
#define V_ip6_filtertunnel VNET(ip6_filtertunnel)
SYSCTL_DECL(_net_inet6_ipsec6);
/* net.inet6.ipsec6 */
SYSCTL_PROC(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, def_policy,
CTLTYPE_INT | CTLFLAG_VNET | CTLFLAG_RW, 0, 0, sysctl_def_policy, "I",
"IPsec default policy.");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_esp_trans_deflev), 0,
"Default ESP transport mode level.");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_esp_net_deflev), 0,
"Default ESP tunnel mode level.");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_ah_trans_deflev), 0,
"AH transfer mode default level.");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_ah_net_deflev), 0,
"AH tunnel mode default level.");
SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, ecn,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_ipsec_ecn), 0,
"Explicit Congestion Notification handling.");
SYSCTL_INT(_net_inet6_ipsec6, OID_AUTO, filtertunnel,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_filtertunnel), 0,
"If set, filter packets from an IPsec tunnel.");
SYSCTL_VNET_PCPUSTAT(_net_inet6_ipsec6, IPSECCTL_STATS, ipsecstats,
struct ipsecstat, ipsec6stat, "IPsec IPv6 statistics.");
#endif /* INET6 */
static int ipsec_in_reject(struct secpolicy *, struct inpcb *,
const struct mbuf *);
#ifdef INET
static void ipsec4_get_ulp(const struct mbuf *, struct secpolicyindex *, int);
static void ipsec4_setspidx_ipaddr(const struct mbuf *,
struct secpolicyindex *);
#endif
#ifdef INET6
static void ipsec6_get_ulp(const struct mbuf *m, struct secpolicyindex *, int);
static void ipsec6_setspidx_ipaddr(const struct mbuf *,
struct secpolicyindex *);
#endif
/*
* Return a held reference to the default SP.
*/
static struct secpolicy *
key_allocsp_default(void)
{
key_addref(V_def_policy);
return (V_def_policy);
}
static void
ipsec_invalidate_cache(struct inpcb *inp, u_int dir)
{
struct secpolicy *sp;
INP_WLOCK_ASSERT(inp);
if (dir == IPSEC_DIR_OUTBOUND) {
if (inp->inp_sp->flags & INP_INBOUND_POLICY)
return;
sp = inp->inp_sp->sp_in;
inp->inp_sp->sp_in = NULL;
} else {
if (inp->inp_sp->flags & INP_OUTBOUND_POLICY)
return;
sp = inp->inp_sp->sp_out;
inp->inp_sp->sp_out = NULL;
}
if (sp != NULL)
key_freesp(&sp); /* release extra reference */
}
static void
ipsec_cachepolicy(struct inpcb *inp, struct secpolicy *sp, u_int dir)
{
uint32_t genid;
int downgrade;
INP_LOCK_ASSERT(inp);
if (dir == IPSEC_DIR_OUTBOUND) {
/* Do we have configured PCB policy? */
if (inp->inp_sp->flags & INP_OUTBOUND_POLICY)
return;
/* Another thread has already set cached policy */
if (inp->inp_sp->sp_out != NULL)
return;
/*
* Do not cache OUTBOUND policy if PCB isn't connected,
* i.e. foreign address is INADDR_ANY/UNSPECIFIED.
*/
#ifdef INET
if ((inp->inp_vflag & INP_IPV4) != 0 &&
inp->inp_faddr.s_addr == INADDR_ANY)
return;
#endif
#ifdef INET6
if ((inp->inp_vflag & INP_IPV6) != 0 &&
IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
return;
#endif
} else {
/* Do we have configured PCB policy? */
if (inp->inp_sp->flags & INP_INBOUND_POLICY)
return;
/* Another thread has already set cached policy */
if (inp->inp_sp->sp_in != NULL)
return;
/*
* Do not cache INBOUND policy for listen socket,
* that is bound to INADDR_ANY/UNSPECIFIED address.
*/
#ifdef INET
if ((inp->inp_vflag & INP_IPV4) != 0 &&
inp->inp_faddr.s_addr == INADDR_ANY)
return;
#endif
#ifdef INET6
if ((inp->inp_vflag & INP_IPV6) != 0 &&
IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
return;
#endif
}
downgrade = 0;
if (!INP_WLOCKED(inp)) {
if ((downgrade = INP_TRY_UPGRADE(inp)) == 0)
return;
}
if (dir == IPSEC_DIR_OUTBOUND)
inp->inp_sp->sp_out = sp;
else
inp->inp_sp->sp_in = sp;
/*
* SP is already referenced by the lookup code.
* We take extra reference here to avoid race in the
* ipsec_getpcbpolicy() function - SP will not be freed in the
* time between we take SP pointer from the cache and key_addref()
* call.
*/
key_addref(sp);
genid = key_getspgen();
if (genid != inp->inp_sp->genid) {
ipsec_invalidate_cache(inp, dir);
inp->inp_sp->genid = genid;
}
KEYDBG(IPSEC_STAMP,
printf("%s: PCB(%p): cached %s SP(%p)\n",
__func__, inp, dir == IPSEC_DIR_OUTBOUND ? "OUTBOUND":
"INBOUND", sp));
if (downgrade != 0)
INP_DOWNGRADE(inp);
}
static struct secpolicy *
ipsec_checkpolicy(struct secpolicy *sp, struct inpcb *inp, int *error)
{
/* Save found OUTBOUND policy into PCB SP cache. */
if (inp != NULL && inp->inp_sp != NULL && inp->inp_sp->sp_out == NULL)
ipsec_cachepolicy(inp, sp, IPSEC_DIR_OUTBOUND);
switch (sp->policy) {
default:
printf("%s: invalid policy %u\n", __func__, sp->policy);
/* FALLTHROUGH */
case IPSEC_POLICY_DISCARD:
*error = -EINVAL; /* Packet is discarded by caller. */
/* FALLTHROUGH */
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
key_freesp(&sp);
sp = NULL; /* NB: force NULL result. */
break;
case IPSEC_POLICY_IPSEC:
/* XXXAE: handle LARVAL SP */
break;
}
KEYDBG(IPSEC_DUMP,
printf("%s: get SP(%p), error %d\n", __func__, sp, *error));
return (sp);
}
static struct secpolicy *
ipsec_getpcbpolicy(struct inpcb *inp, u_int dir)
{
struct secpolicy *sp;
int flags, downgrade;
if (inp == NULL || inp->inp_sp == NULL)
return (NULL);
INP_LOCK_ASSERT(inp);
flags = inp->inp_sp->flags;
if (dir == IPSEC_DIR_OUTBOUND) {
sp = inp->inp_sp->sp_out;
flags &= INP_OUTBOUND_POLICY;
} else {
sp = inp->inp_sp->sp_in;
flags &= INP_INBOUND_POLICY;
}
/*
* Check flags. If we have PCB SP, just return it.
* Otherwise we need to check that cached SP entry isn't stale.
*/
if (flags == 0) {
if (sp == NULL)
return (NULL);
if (inp->inp_sp->genid != key_getspgen()) {
/* Invalidate the cache. */
downgrade = 0;
if (!INP_WLOCKED(inp)) {
if ((downgrade = INP_TRY_UPGRADE(inp)) == 0)
return (NULL);
}
ipsec_invalidate_cache(inp, IPSEC_DIR_OUTBOUND);
ipsec_invalidate_cache(inp, IPSEC_DIR_INBOUND);
if (downgrade != 0)
INP_DOWNGRADE(inp);
return (NULL);
}
KEYDBG(IPSEC_STAMP,
printf("%s: PCB(%p): cache hit SP(%p)\n",
__func__, inp, sp));
/* Return referenced cached policy */
}
key_addref(sp);
return (sp);
}
#ifdef INET
static void
ipsec4_get_ulp(const struct mbuf *m, struct secpolicyindex *spidx,
int needport)
{
uint8_t nxt;
int off;
/* Sanity check. */
IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),
("packet too short"));
if (m->m_len >= sizeof (struct ip)) {
const struct ip *ip = mtod(m, const struct ip *);
if (ip->ip_off & htons(IP_MF | IP_OFFMASK))
goto done;
off = ip->ip_hl << 2;
nxt = ip->ip_p;
} else {
struct ip ih;
m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
if (ih.ip_off & htons(IP_MF | IP_OFFMASK))
goto done;
off = ih.ip_hl << 2;
nxt = ih.ip_p;
}
while (off < m->m_pkthdr.len) {
struct ip6_ext ip6e;
struct tcphdr th;
struct udphdr uh;
switch (nxt) {
case IPPROTO_TCP:
spidx->ul_proto = nxt;
if (!needport)
goto done_proto;
if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
goto done;
m_copydata(m, off, sizeof (th), (caddr_t) &th);
spidx->src.sin.sin_port = th.th_sport;
spidx->dst.sin.sin_port = th.th_dport;
return;
case IPPROTO_UDP:
spidx->ul_proto = nxt;
if (!needport)
goto done_proto;
if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
goto done;
m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
spidx->src.sin.sin_port = uh.uh_sport;
spidx->dst.sin.sin_port = uh.uh_dport;
return;
case IPPROTO_AH:
if (off + sizeof(ip6e) > m->m_pkthdr.len)
goto done;
/* XXX Sigh, this works but is totally bogus. */
m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
off += (ip6e.ip6e_len + 2) << 2;
nxt = ip6e.ip6e_nxt;
break;
case IPPROTO_ICMP:
default:
/* XXX Intermediate headers??? */
spidx->ul_proto = nxt;
goto done_proto;
}
}
done:
spidx->ul_proto = IPSEC_ULPROTO_ANY;
done_proto:
spidx->src.sin.sin_port = IPSEC_PORT_ANY;
spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
KEYDBG(IPSEC_DUMP,
printf("%s: ", __func__); kdebug_secpolicyindex(spidx, NULL));
}
static void
ipsec4_setspidx_ipaddr(const struct mbuf *m, struct secpolicyindex *spidx)
{
ipsec4_setsockaddrs(m, &spidx->src, &spidx->dst);
spidx->prefs = sizeof(struct in_addr) << 3;
spidx->prefd = sizeof(struct in_addr) << 3;
}
static struct secpolicy *
ipsec4_getpolicy(const struct mbuf *m, struct inpcb *inp, u_int dir)
{
struct secpolicyindex spidx;
struct secpolicy *sp;
sp = ipsec_getpcbpolicy(inp, dir);
if (sp == NULL && key_havesp(dir)) {
/* Make an index to look for a policy. */
ipsec4_setspidx_ipaddr(m, &spidx);
/* Fill ports in spidx if we have inpcb. */
ipsec4_get_ulp(m, &spidx, inp != NULL);
spidx.dir = dir;
sp = key_allocsp(&spidx, dir);
}
if (sp == NULL) /* No SP found, use system default. */
sp = key_allocsp_default();
return (sp);
}
/*
* Check security policy for *OUTBOUND* IPv4 packet.
*/
struct secpolicy *
ipsec4_checkpolicy(const struct mbuf *m, struct inpcb *inp, int *error)
{
struct secpolicy *sp;
*error = 0;
sp = ipsec4_getpolicy(m, inp, IPSEC_DIR_OUTBOUND);
if (sp != NULL)
sp = ipsec_checkpolicy(sp, inp, error);
if (sp == NULL) {
switch (*error) {
case 0: /* No IPsec required: BYPASS or NONE */
break;
case -EINVAL:
IPSECSTAT_INC(ips_out_polvio);
break;
default:
IPSECSTAT_INC(ips_out_inval);
}
}
KEYDBG(IPSEC_STAMP,
printf("%s: using SP(%p), error %d\n", __func__, sp, *error));
if (sp != NULL)
KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
return (sp);
}
/*
* Check IPv4 packet against *INBOUND* security policy.
* This function is called from tcp_input(), udp_input(),
* rip_input() and sctp_input().
*/
int
ipsec4_in_reject(const struct mbuf *m, struct inpcb *inp)
{
struct secpolicy *sp;
int result;
sp = ipsec4_getpolicy(m, inp, IPSEC_DIR_INBOUND);
result = ipsec_in_reject(sp, inp, m);
key_freesp(&sp);
if (result != 0)
IPSECSTAT_INC(ips_in_polvio);
return (result);
}
/*
* IPSEC_CAP() method implementation for IPv4.
*/
int
ipsec4_capability(struct mbuf *m, u_int cap)
{
switch (cap) {
case IPSEC_CAP_BYPASS_FILTER:
/*
* Bypass packet filtering for packets previously handled
* by IPsec.
*/
if (!V_ip4_filtertunnel &&
m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
return (1);
return (0);
case IPSEC_CAP_OPERABLE:
/* Do we have active security policies? */
if (key_havesp(IPSEC_DIR_INBOUND) != 0 ||
key_havesp(IPSEC_DIR_OUTBOUND) != 0)
return (1);
return (0);
};
return (EOPNOTSUPP);
}
#endif /* INET */
#ifdef INET6
static void
ipsec6_get_ulp(const struct mbuf *m, struct secpolicyindex *spidx,
int needport)
{
struct tcphdr th;
struct udphdr uh;
struct icmp6_hdr ih;
int off, nxt;
IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip6_hdr),
("packet too short"));
/* Set default. */
spidx->ul_proto = IPSEC_ULPROTO_ANY;
spidx->src.sin6.sin6_port = IPSEC_PORT_ANY;
spidx->dst.sin6.sin6_port = IPSEC_PORT_ANY;
nxt = -1;
off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
if (off < 0 || m->m_pkthdr.len < off)
return;
switch (nxt) {
case IPPROTO_TCP:
spidx->ul_proto = nxt;
if (!needport)
break;
if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
break;
m_copydata(m, off, sizeof(th), (caddr_t)&th);
spidx->src.sin6.sin6_port = th.th_sport;
spidx->dst.sin6.sin6_port = th.th_dport;
break;
case IPPROTO_UDP:
spidx->ul_proto = nxt;
if (!needport)
break;
if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
break;
m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
spidx->src.sin6.sin6_port = uh.uh_sport;
spidx->dst.sin6.sin6_port = uh.uh_dport;
break;
case IPPROTO_ICMPV6:
spidx->ul_proto = nxt;
if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len)
break;
m_copydata(m, off, sizeof(ih), (caddr_t)&ih);
spidx->src.sin6.sin6_port = htons((uint16_t)ih.icmp6_type);
spidx->dst.sin6.sin6_port = htons((uint16_t)ih.icmp6_code);
break;
default:
/* XXX Intermediate headers??? */
spidx->ul_proto = nxt;
break;
}
KEYDBG(IPSEC_DUMP,
printf("%s: ", __func__); kdebug_secpolicyindex(spidx, NULL));
}
static void
ipsec6_setspidx_ipaddr(const struct mbuf *m, struct secpolicyindex *spidx)
{
ipsec6_setsockaddrs(m, &spidx->src, &spidx->dst);
spidx->prefs = sizeof(struct in6_addr) << 3;
spidx->prefd = sizeof(struct in6_addr) << 3;
}
static struct secpolicy *
ipsec6_getpolicy(const struct mbuf *m, struct inpcb *inp, u_int dir)
{
struct secpolicyindex spidx;
struct secpolicy *sp;
sp = ipsec_getpcbpolicy(inp, dir);
if (sp == NULL && key_havesp(dir)) {
/* Make an index to look for a policy. */
ipsec6_setspidx_ipaddr(m, &spidx);
/* Fill ports in spidx if we have inpcb. */
ipsec6_get_ulp(m, &spidx, inp != NULL);
spidx.dir = dir;
sp = key_allocsp(&spidx, dir);
}
if (sp == NULL) /* No SP found, use system default. */
sp = key_allocsp_default();
return (sp);
}
/*
* Check security policy for *OUTBOUND* IPv6 packet.
*/
struct secpolicy *
ipsec6_checkpolicy(const struct mbuf *m, struct inpcb *inp, int *error)
{
struct secpolicy *sp;
*error = 0;
sp = ipsec6_getpolicy(m, inp, IPSEC_DIR_OUTBOUND);
if (sp != NULL)
sp = ipsec_checkpolicy(sp, inp, error);
if (sp == NULL) {
switch (*error) {
case 0: /* No IPsec required: BYPASS or NONE */
break;
case -EINVAL:
IPSEC6STAT_INC(ips_out_polvio);
break;
default:
IPSEC6STAT_INC(ips_out_inval);
}
}
KEYDBG(IPSEC_STAMP,
printf("%s: using SP(%p), error %d\n", __func__, sp, *error));
if (sp != NULL)
KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
return (sp);
}
/*
* Check IPv6 packet against inbound security policy.
* This function is called from tcp6_input(), udp6_input(),
* rip6_input() and sctp_input().
*/
int
ipsec6_in_reject(const struct mbuf *m, struct inpcb *inp)
{
struct secpolicy *sp;
int result;
sp = ipsec6_getpolicy(m, inp, IPSEC_DIR_INBOUND);
result = ipsec_in_reject(sp, inp, m);
key_freesp(&sp);
if (result)
IPSEC6STAT_INC(ips_in_polvio);
return (result);
}
/*
* IPSEC_CAP() method implementation for IPv6.
*/
int
ipsec6_capability(struct mbuf *m, u_int cap)
{
switch (cap) {
case IPSEC_CAP_BYPASS_FILTER:
/*
* Bypass packet filtering for packets previously handled
* by IPsec.
*/
if (!V_ip6_filtertunnel &&
m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
return (1);
return (0);
case IPSEC_CAP_OPERABLE:
/* Do we have active security policies? */
if (key_havesp(IPSEC_DIR_INBOUND) != 0 ||
key_havesp(IPSEC_DIR_OUTBOUND) != 0)
return (1);
return (0);
};
return (EOPNOTSUPP);
}
#endif /* INET6 */
int
ipsec_run_hhooks(struct ipsec_ctx_data *ctx, int type)
{
int idx;
switch (ctx->af) {
#ifdef INET
case AF_INET:
idx = HHOOK_IPSEC_INET;
break;
#endif
#ifdef INET6
case AF_INET6:
idx = HHOOK_IPSEC_INET6;
break;
#endif
default:
return (EPFNOSUPPORT);
}
if (type == HHOOK_TYPE_IPSEC_IN)
HHOOKS_RUN_IF(V_ipsec_hhh_in[idx], ctx, NULL);
else
HHOOKS_RUN_IF(V_ipsec_hhh_out[idx], ctx, NULL);
if (*ctx->mp == NULL)
return (EACCES);
return (0);
}
/*
* Return current level.
* Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
*/
u_int
ipsec_get_reqlevel(struct secpolicy *sp, u_int idx)
{
struct ipsecrequest *isr;
u_int esp_trans_deflev, esp_net_deflev;
u_int ah_trans_deflev, ah_net_deflev;
u_int level = 0;
IPSEC_ASSERT(idx < sp->tcount, ("Wrong IPsec request index %d", idx));
/* XXX Note that we have ipseclog() expanded here - code sync issue. */
#define IPSEC_CHECK_DEFAULT(lev) \
(((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE && \
(lev) != IPSEC_LEVEL_UNIQUE) \
? (V_ipsec_debug ? \
log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
(lev), IPSEC_LEVEL_REQUIRE) : 0), \
(lev) = IPSEC_LEVEL_REQUIRE, (lev) : (lev))
/*
* IPsec VTI uses unique security policy with fake spidx filled
* with zeroes. Just return IPSEC_LEVEL_REQUIRE instead of doing
* full level lookup for such policies.
*/
if (sp->state == IPSEC_SPSTATE_IFNET) {
IPSEC_ASSERT(sp->req[idx]->level == IPSEC_LEVEL_UNIQUE,
("Wrong IPsec request level %d", sp->req[idx]->level));
return (IPSEC_LEVEL_REQUIRE);
}
/* Set default level. */
switch (sp->spidx.src.sa.sa_family) {
#ifdef INET
case AF_INET:
esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_trans_deflev);
esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_net_deflev);
ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_trans_deflev);
ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_net_deflev);
break;
#endif
#ifdef INET6
case AF_INET6:
esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_trans_deflev);
esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_net_deflev);
ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_trans_deflev);
ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_net_deflev);
break;
#endif /* INET6 */
default:
panic("%s: unknown af %u",
__func__, sp->spidx.src.sa.sa_family);
}
#undef IPSEC_CHECK_DEFAULT
isr = sp->req[idx];
/* Set level. */
switch (isr->level) {
case IPSEC_LEVEL_DEFAULT:
switch (isr->saidx.proto) {
case IPPROTO_ESP:
if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
level = esp_net_deflev;
else
level = esp_trans_deflev;
break;
case IPPROTO_AH:
if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
level = ah_net_deflev;
else
level = ah_trans_deflev;
break;
case IPPROTO_IPCOMP:
/*
* We don't really care, as IPcomp document says that
* we shouldn't compress small packets.
*/
level = IPSEC_LEVEL_USE;
break;
default:
panic("%s: Illegal protocol defined %u\n", __func__,
isr->saidx.proto);
}
break;
case IPSEC_LEVEL_USE:
case IPSEC_LEVEL_REQUIRE:
level = isr->level;
break;
case IPSEC_LEVEL_UNIQUE:
level = IPSEC_LEVEL_REQUIRE;
break;
default:
panic("%s: Illegal IPsec level %u\n", __func__, isr->level);
}
return (level);
}
static int
ipsec_check_history(const struct mbuf *m, struct secpolicy *sp, u_int idx)
{
struct xform_history *xh;
struct m_tag *mtag;
mtag = NULL;
while ((mtag = m_tag_find(__DECONST(struct mbuf *, m),
PACKET_TAG_IPSEC_IN_DONE, mtag)) != NULL) {
xh = (struct xform_history *)(mtag + 1);
KEYDBG(IPSEC_DATA,
char buf[IPSEC_ADDRSTRLEN];
printf("%s: mode %s proto %u dst %s\n", __func__,
kdebug_secasindex_mode(xh->mode), xh->proto,
ipsec_address(&xh->dst, buf, sizeof(buf))));
if (xh->proto != sp->req[idx]->saidx.proto)
continue;
/* If SA had IPSEC_MODE_ANY, consider this as match. */
if (xh->mode != sp->req[idx]->saidx.mode &&
xh->mode != IPSEC_MODE_ANY)
continue;
/*
* For transport mode IPsec request doesn't contain
* addresses. We need to use address from spidx.
*/
if (sp->req[idx]->saidx.mode == IPSEC_MODE_TRANSPORT) {
if (key_sockaddrcmp_withmask(&xh->dst.sa,
&sp->spidx.dst.sa, sp->spidx.prefd) != 0)
continue;
} else {
if (key_sockaddrcmp(&xh->dst.sa,
&sp->req[idx]->saidx.dst.sa, 0) != 0)
continue;
}
return (0); /* matched */
}
return (1);
}
/*
* Check security policy requirements against the actual
* packet contents. Return one if the packet should be
* reject as "invalid"; otherwiser return zero to have the
* packet treated as "valid".
*
* OUT:
* 0: valid
* 1: invalid
*/
static int
ipsec_in_reject(struct secpolicy *sp, struct inpcb *inp, const struct mbuf *m)
{
int i;
KEYDBG(IPSEC_STAMP,
printf("%s: PCB(%p): using SP(%p)\n", __func__, inp, sp));
KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
if (inp != NULL && inp->inp_sp != NULL && inp->inp_sp->sp_in == NULL)
ipsec_cachepolicy(inp, sp, IPSEC_DIR_INBOUND);
/* Check policy. */
switch (sp->policy) {
case IPSEC_POLICY_DISCARD:
return (1);
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
return (0);
}
IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
("invalid policy %u", sp->policy));
/*
* ipsec[46]_common_input_cb after each transform adds
* PACKET_TAG_IPSEC_IN_DONE mbuf tag. It contains SPI, proto, mode
* and destination address from saidx. We can compare info from
* these tags with requirements in SP.
*/
for (i = 0; i < sp->tcount; i++) {
/*
* Do not check IPcomp, since IPcomp document
* says that we shouldn't compress small packets.
* IPComp policy should always be treated as being
* in "use" level.
*/
if (sp->req[i]->saidx.proto == IPPROTO_IPCOMP ||
ipsec_get_reqlevel(sp, i) != IPSEC_LEVEL_REQUIRE)
continue;
if (V_check_policy_history != 0 &&
ipsec_check_history(m, sp, i) != 0)
return (1);
else switch (sp->req[i]->saidx.proto) {
case IPPROTO_ESP:
if ((m->m_flags & M_DECRYPTED) == 0) {
KEYDBG(IPSEC_DUMP,
printf("%s: ESP m_flags:%x\n", __func__,
m->m_flags));
return (1);
}
break;
case IPPROTO_AH:
if ((m->m_flags & M_AUTHIPHDR) == 0) {
KEYDBG(IPSEC_DUMP,
printf("%s: AH m_flags:%x\n", __func__,
m->m_flags));
return (1);
}
break;
}
}
return (0); /* Valid. */
}
/*
* Compute the byte size to be occupied by IPsec header.
* In case it is tunnelled, it includes the size of outer IP header.
*/
static size_t
ipsec_hdrsiz_internal(struct secpolicy *sp)
{
size_t size;
int i;
KEYDBG(IPSEC_STAMP, printf("%s: using SP(%p)\n", __func__, sp));
KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
switch (sp->policy) {
case IPSEC_POLICY_DISCARD:
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
return (0);
}
IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
("invalid policy %u", sp->policy));
/*
* XXX: for each transform we need to lookup suitable SA
* and use info from SA to calculate headers size.
* XXX: for NAT-T we need to cosider UDP header size.
*/
size = 0;
for (i = 0; i < sp->tcount; i++) {
switch (sp->req[i]->saidx.proto) {
case IPPROTO_ESP:
size += esp_hdrsiz(NULL);
break;
case IPPROTO_AH:
size += ah_hdrsiz(NULL);
break;
case IPPROTO_IPCOMP:
size += sizeof(struct ipcomp);
break;
}
if (sp->req[i]->saidx.mode == IPSEC_MODE_TUNNEL) {
switch (sp->req[i]->saidx.dst.sa.sa_family) {
#ifdef INET
case AF_INET:
size += sizeof(struct ip);
break;
#endif
#ifdef INET6
case AF_INET6:
size += sizeof(struct ip6_hdr);
break;
#endif
default:
ipseclog((LOG_ERR, "%s: unknown AF %d in "
"IPsec tunnel SA\n", __func__,
sp->req[i]->saidx.dst.sa.sa_family));
break;
}
}
}
return (size);
}
/*
* Compute ESP/AH header size for protocols with PCB, including
* outer IP header. Currently only tcp_output() uses it.
*/
size_t
ipsec_hdrsiz_inpcb(struct inpcb *inp)
{
struct secpolicyindex spidx;
struct secpolicy *sp;
size_t sz;
sp = ipsec_getpcbpolicy(inp, IPSEC_DIR_OUTBOUND);
if (sp == NULL && key_havesp(IPSEC_DIR_OUTBOUND)) {
ipsec_setspidx_inpcb(inp, &spidx, IPSEC_DIR_OUTBOUND);
sp = key_allocsp(&spidx, IPSEC_DIR_OUTBOUND);
}
if (sp == NULL)
sp = key_allocsp_default();
sz = ipsec_hdrsiz_internal(sp);
key_freesp(&sp);
return (sz);
}
/*
* Check the variable replay window.
* ipsec_chkreplay() performs replay check before ICV verification.
* ipsec_updatereplay() updates replay bitmap. This must be called after
* ICV verification (it also performs replay check, which is usually done
* beforehand).
* 0 (zero) is returned if packet disallowed, 1 if packet permitted.
*
* Based on RFC 6479. Blocks are 32 bits unsigned integers
*/
#define IPSEC_BITMAP_INDEX_MASK(w) (w - 1)
#define IPSEC_REDUNDANT_BIT_SHIFTS 5
#define IPSEC_REDUNDANT_BITS (1 << IPSEC_REDUNDANT_BIT_SHIFTS)
#define IPSEC_BITMAP_LOC_MASK (IPSEC_REDUNDANT_BITS - 1)
int
ipsec_chkreplay(uint32_t seq, struct secasvar *sav)
{
const struct secreplay *replay;
uint32_t wsizeb; /* Constant: window size. */
int index, bit_location;
IPSEC_ASSERT(sav != NULL, ("Null SA"));
IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
replay = sav->replay;
/* No need to check replay if disabled. */
if (replay->wsize == 0)
return (1);
/* Constant. */
wsizeb = replay->wsize << 3;
/* Sequence number of 0 is invalid. */
if (seq == 0)
return (0);
/* First time is always okay. */
if (replay->count == 0)
return (1);
/* Larger sequences are okay. */
if (seq > replay->lastseq)
return (1);
/* Over range to check, i.e. too old or wrapped. */
if (replay->lastseq - seq >= wsizeb)
return (0);
/* The sequence is inside the sliding window
* now check the bit in the bitmap
* bit location only depends on the sequence number
*/
bit_location = seq & IPSEC_BITMAP_LOC_MASK;
index = (seq >> IPSEC_REDUNDANT_BIT_SHIFTS)
& IPSEC_BITMAP_INDEX_MASK(replay->bitmap_size);
/* This packet already seen? */
if ((replay->bitmap)[index] & (1 << bit_location))
return (0);
return (1);
}
/*
* Check replay counter whether to update or not.
* OUT: 0: OK
* 1: NG
*/
int
ipsec_updatereplay(uint32_t seq, struct secasvar *sav)
{
char buf[128];
struct secreplay *replay;
uint32_t wsizeb; /* Constant: window size. */
int diff, index, bit_location;
IPSEC_ASSERT(sav != NULL, ("Null SA"));
IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
replay = sav->replay;
if (replay->wsize == 0)
goto ok; /* No need to check replay. */
/* Constant. */
wsizeb = replay->wsize << 3;
/* Sequence number of 0 is invalid. */
if (seq == 0)
return (1);
/* The packet is too old, no need to update */
if (wsizeb + seq < replay->lastseq)
goto ok;
/* Now update the bit */
index = (seq >> IPSEC_REDUNDANT_BIT_SHIFTS);
/* First check if the sequence number is in the range */
if (seq > replay->lastseq) {
int id;
int index_cur = replay->lastseq >> IPSEC_REDUNDANT_BIT_SHIFTS;
diff = index - index_cur;
if (diff > replay->bitmap_size) {
/* something unusual in this case */
diff = replay->bitmap_size;
}
for (id = 0; id < diff; ++id) {
replay->bitmap[(id + index_cur + 1)
& IPSEC_BITMAP_INDEX_MASK(replay->bitmap_size)] = 0;
}
replay->lastseq = seq;
}
index &= IPSEC_BITMAP_INDEX_MASK(replay->bitmap_size);
bit_location = seq & IPSEC_BITMAP_LOC_MASK;
/* this packet has already been received */
if (replay->bitmap[index] & (1 << bit_location))
return (1);
replay->bitmap[index] |= (1 << bit_location);
ok:
if (replay->count == ~0) {
/* Set overflow flag. */
replay->overflow++;
/* Don't increment, no more packets accepted. */
if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
if (sav->sah->saidx.proto == IPPROTO_AH)
AHSTAT_INC(ahs_wrap);
else if (sav->sah->saidx.proto == IPPROTO_ESP)
ESPSTAT_INC(esps_wrap);
return (1);
}
ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n",
__func__, replay->overflow,
ipsec_sa2str(sav, buf, sizeof(buf))));
}
return (0);
}
int
ipsec_updateid(struct secasvar *sav, uint64_t *new, uint64_t *old)
{
uint64_t tmp;
/*
* tdb_cryptoid is initialized by xform_init().
* Then it can be changed only when some crypto error occurred or
* when SA is deleted. We stored used cryptoid in the xform_data
* structure. In case when crypto error occurred and crypto
* subsystem has reinited the session, it returns new cryptoid
* and EAGAIN error code.
*
* This function will be called when we got EAGAIN from crypto
* subsystem.
* *new is cryptoid that was returned by crypto subsystem in
* the crp_sid.
* *old is the original cryptoid that we stored in xform_data.
*
* For first failed request *old == sav->tdb_cryptoid, then
* we update sav->tdb_cryptoid and redo crypto_dispatch().
* For next failed request *old != sav->tdb_cryptoid, then
* we store cryptoid from first request into the *new variable
* and crp_sid from this second session will be returned via
* *old pointer, so caller can release second session.
*
* XXXAE: check this more carefully.
*/
KEYDBG(IPSEC_STAMP,
printf("%s: SA(%p) moves cryptoid %jd -> %jd\n",
__func__, sav, (uintmax_t)(*old), (uintmax_t)(*new)));
KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
SECASVAR_LOCK(sav);
if (sav->tdb_cryptoid != *old) {
/* cryptoid was already updated */
tmp = *new;
*new = sav->tdb_cryptoid;
*old = tmp;
SECASVAR_UNLOCK(sav);
return (1);
}
sav->tdb_cryptoid = *new;
SECASVAR_UNLOCK(sav);
return (0);
}
int
ipsec_initialized(void)
{
return (V_def_policy != NULL);
}
static void
def_policy_init(const void *unused __unused)
{
V_def_policy = key_newsp();
if (V_def_policy != NULL) {
V_def_policy->policy = IPSEC_POLICY_NONE;
/* Force INPCB SP cache invalidation */
key_bumpspgen();
} else
printf("%s: failed to initialize default policy\n", __func__);
}
static void
def_policy_uninit(const void *unused __unused)
{
if (V_def_policy != NULL) {
key_freesp(&V_def_policy);
key_bumpspgen();
}
}
VNET_SYSINIT(def_policy_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST,
def_policy_init, NULL);
VNET_SYSUNINIT(def_policy_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST,
def_policy_uninit, NULL);
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