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4a67e051a9
Make clear that this is not a good idea when called from tcp_output()->ipsec_hdrsiz_tcp()->ipsec4_hdrsize_tcp() as we do not know if IPsec processing is needed at that point.
1972 lines
47 KiB
C
1972 lines
47 KiB
C
/* $FreeBSD$ */
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/* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
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/*-
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* IPsec controller part.
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*/
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/priv.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/ip6.h>
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#ifdef INET6
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#include <netinet6/ip6_var.h>
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#endif
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#include <netinet/in_pcb.h>
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#ifdef INET6
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#include <netinet/icmp6.h>
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#endif
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#include <sys/types.h>
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#include <netipsec/ipsec.h>
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#ifdef INET6
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#include <netipsec/ipsec6.h>
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#endif
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#include <netipsec/ah_var.h>
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#include <netipsec/esp_var.h>
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#include <netipsec/ipcomp.h> /*XXX*/
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#include <netipsec/ipcomp_var.h>
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#include <netipsec/key.h>
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#include <netipsec/keydb.h>
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#include <netipsec/key_debug.h>
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#include <netipsec/xform.h>
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#include <machine/in_cksum.h>
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#include <opencrypto/cryptodev.h>
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#ifdef IPSEC_DEBUG
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int ipsec_debug = 1;
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#else
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int ipsec_debug = 0;
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#endif
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/* NB: name changed so netstat doesn't use it */
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struct ipsecstat ipsec4stat;
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int ip4_ah_offsetmask = 0; /* maybe IP_DF? */
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int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */
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int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
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int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
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int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
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int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
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struct secpolicy ip4_def_policy;
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int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
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int ip4_esp_randpad = -1;
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/*
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* Crypto support requirements:
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*
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* 1 require hardware support
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* -1 require software support
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* 0 take anything
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*/
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int crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
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SYSCTL_DECL(_net_inet_ipsec);
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/* net.inet.ipsec */
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
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def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
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CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
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CTLFLAG_RW, &ip4_esp_net_deflev, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
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CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
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CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
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ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
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ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
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dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
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ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
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debug, CTLFLAG_RW, &ipsec_debug, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
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esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, "");
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SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
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crypto_support, CTLFLAG_RW, &crypto_support,0, "");
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SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
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ipsecstats, CTLFLAG_RD, &ipsec4stat, ipsecstat, "");
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#ifdef REGRESSION
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/*
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* When set to 1, IPsec will send packets with the same sequence number.
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* This allows to verify if the other side has proper replay attacks detection.
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*/
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int ipsec_replay = 0;
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SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0,
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"Emulate replay attack");
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/*
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* When set 1, IPsec will send packets with corrupted HMAC.
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* This allows to verify if the other side properly detects modified packets.
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*/
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int ipsec_integrity = 0;
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SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW,
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&ipsec_integrity, 0, "Emulate man-in-the-middle attack");
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#endif
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#ifdef INET6
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struct ipsecstat ipsec6stat;
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int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
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int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
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int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
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int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
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int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
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int ip6_esp_randpad = -1;
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SYSCTL_DECL(_net_inet6_ipsec6);
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/* net.inet6.ipsec6 */
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#ifdef COMPAT_KAME
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SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
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0,0, compat_ipsecstats_sysctl, "S", "");
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#endif /* COMPAT_KAME */
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
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def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
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CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
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CTLFLAG_RW, &ip6_esp_net_deflev, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
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CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
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CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
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ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
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debug, CTLFLAG_RW, &ipsec_debug, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
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esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, "");
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SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS,
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ipsecstats, CTLFLAG_RD, &ipsec6stat, ipsecstat, "");
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#endif /* INET6 */
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static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
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#ifdef INET6
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static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb));
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#endif
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static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
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static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
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static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
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#ifdef INET6
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static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
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static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
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#endif
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static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
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static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
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static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
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int optname, caddr_t request, size_t len, int priv));
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static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
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static void vshiftl __P((unsigned char *, int, int));
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static size_t ipsec_hdrsiz __P((struct secpolicy *));
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MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy");
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/*
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* Return a held reference to the default SP.
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*/
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static struct secpolicy *
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key_allocsp_default(const char* where, int tag)
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{
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struct secpolicy *sp;
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KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
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printf("DP key_allocsp_default from %s:%u\n", where, tag));
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sp = &ip4_def_policy;
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if (sp->policy != IPSEC_POLICY_DISCARD &&
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sp->policy != IPSEC_POLICY_NONE) {
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ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
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sp->policy, IPSEC_POLICY_NONE));
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sp->policy = IPSEC_POLICY_NONE;
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}
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key_addref(sp);
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KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
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printf("DP key_allocsp_default returns SP:%p (%u)\n",
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sp, sp->refcnt));
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return sp;
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}
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#define KEY_ALLOCSP_DEFAULT() \
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key_allocsp_default(__FILE__, __LINE__)
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/*
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* For OUTBOUND packet having a socket. Searching SPD for packet,
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* and return a pointer to SP.
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* OUT: NULL: no apropreate SP found, the following value is set to error.
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* 0 : bypass
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* EACCES : discard packet.
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* ENOENT : ipsec_acquire() in progress, maybe.
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* others : error occured.
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* others: a pointer to SP
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*
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* NOTE: IPv6 mapped adddress concern is implemented here.
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*/
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struct secpolicy *
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ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
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{
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struct secpolicy *sp;
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IPSEC_ASSERT(tdbi != NULL, ("null tdbi"));
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IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
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("invalid direction %u", dir));
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sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
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if (sp == NULL) /*XXX????*/
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sp = KEY_ALLOCSP_DEFAULT();
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IPSEC_ASSERT(sp != NULL, ("null SP"));
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return sp;
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}
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/*
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* For OUTBOUND packet having a socket. Searching SPD for packet,
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* and return a pointer to SP.
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* OUT: NULL: no apropreate SP found, the following value is set to error.
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* 0 : bypass
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* EACCES : discard packet.
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* ENOENT : ipsec_acquire() in progress, maybe.
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* others : error occured.
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* others: a pointer to SP
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*
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* NOTE: IPv6 mapped adddress concern is implemented here.
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*/
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struct secpolicy *
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ipsec_getpolicybysock(m, dir, inp, error)
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struct mbuf *m;
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u_int dir;
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struct inpcb *inp;
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int *error;
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{
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struct inpcbpolicy *pcbsp = NULL;
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struct secpolicy *currsp = NULL; /* policy on socket */
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struct secpolicy *sp;
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IPSEC_ASSERT(m != NULL, ("null mbuf"));
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IPSEC_ASSERT(inp != NULL, ("null inpcb"));
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IPSEC_ASSERT(error != NULL, ("null error"));
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IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
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("invalid direction %u", dir));
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/* set spidx in pcb */
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if (inp->inp_vflag & INP_IPV6PROTO) {
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#ifdef INET6
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*error = ipsec6_setspidx_in6pcb(m, inp);
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pcbsp = inp->in6p_sp;
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#else
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*error = EINVAL; /* should not happen */
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#endif
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} else {
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*error = ipsec4_setspidx_inpcb(m, inp);
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pcbsp = inp->inp_sp;
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}
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if (*error)
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return NULL;
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IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp"));
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switch (dir) {
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case IPSEC_DIR_INBOUND:
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currsp = pcbsp->sp_in;
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break;
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case IPSEC_DIR_OUTBOUND:
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currsp = pcbsp->sp_out;
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break;
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}
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IPSEC_ASSERT(currsp != NULL, ("null currsp"));
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if (pcbsp->priv) { /* when privilieged socket */
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switch (currsp->policy) {
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case IPSEC_POLICY_BYPASS:
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case IPSEC_POLICY_IPSEC:
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key_addref(currsp);
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sp = currsp;
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break;
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case IPSEC_POLICY_ENTRUST:
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/* look for a policy in SPD */
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sp = KEY_ALLOCSP(&currsp->spidx, dir);
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if (sp == NULL) /* no SP found */
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sp = KEY_ALLOCSP_DEFAULT();
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break;
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default:
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ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n",
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__func__, currsp->policy));
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*error = EINVAL;
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return NULL;
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}
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} else { /* unpriv, SPD has policy */
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sp = KEY_ALLOCSP(&currsp->spidx, dir);
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if (sp == NULL) { /* no SP found */
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switch (currsp->policy) {
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case IPSEC_POLICY_BYPASS:
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ipseclog((LOG_ERR, "%s: Illegal policy for "
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"non-priviliged defined %d\n",
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__func__, currsp->policy));
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*error = EINVAL;
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return NULL;
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case IPSEC_POLICY_ENTRUST:
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sp = KEY_ALLOCSP_DEFAULT();
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break;
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case IPSEC_POLICY_IPSEC:
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key_addref(currsp);
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sp = currsp;
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break;
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default:
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ipseclog((LOG_ERR, "%s: Invalid policy for "
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"PCB %d\n", __func__, currsp->policy));
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*error = EINVAL;
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return NULL;
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}
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}
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}
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IPSEC_ASSERT(sp != NULL,
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("null SP (priv %u policy %u", pcbsp->priv, currsp->policy));
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KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
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printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n",
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__func__, pcbsp->priv, currsp->policy, sp, sp->refcnt));
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return sp;
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}
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/*
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* For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
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* and return a pointer to SP.
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* OUT: positive: a pointer to the entry for security policy leaf matched.
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* NULL: no apropreate SP found, the following value is set to error.
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* 0 : bypass
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* EACCES : discard packet.
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* ENOENT : ipsec_acquire() in progress, maybe.
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* others : error occured.
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*/
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struct secpolicy *
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ipsec_getpolicybyaddr(m, dir, flag, error)
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struct mbuf *m;
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u_int dir;
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int flag;
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int *error;
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{
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struct secpolicyindex spidx;
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struct secpolicy *sp;
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IPSEC_ASSERT(m != NULL, ("null mbuf"));
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IPSEC_ASSERT(error != NULL, ("null error"));
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IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
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("invalid direction %u", dir));
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sp = NULL;
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if (key_havesp(dir)) {
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/* Make an index to look for a policy. */
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*error = ipsec_setspidx(m, &spidx,
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(flag & IP_FORWARDING) ? 0 : 1);
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if (*error != 0) {
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DPRINTF(("%s: setpidx failed, dir %u flag %u\n",
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__func__, dir, flag));
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return NULL;
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}
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spidx.dir = dir;
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sp = KEY_ALLOCSP(&spidx, dir);
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}
|
|
if (sp == NULL) /* no SP found, use system default */
|
|
sp = KEY_ALLOCSP_DEFAULT();
|
|
IPSEC_ASSERT(sp != NULL, ("null SP"));
|
|
return sp;
|
|
}
|
|
|
|
struct secpolicy *
|
|
ipsec4_checkpolicy(m, dir, flag, error, inp)
|
|
struct mbuf *m;
|
|
u_int dir, flag;
|
|
int *error;
|
|
struct inpcb *inp;
|
|
{
|
|
struct secpolicy *sp;
|
|
|
|
*error = 0;
|
|
if (inp == NULL)
|
|
sp = ipsec_getpolicybyaddr(m, dir, flag, error);
|
|
else
|
|
sp = ipsec_getpolicybysock(m, dir, inp, error);
|
|
if (sp == NULL) {
|
|
IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error"));
|
|
ipsec4stat.ips_out_inval++;
|
|
return NULL;
|
|
}
|
|
IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error));
|
|
switch (sp->policy) {
|
|
case IPSEC_POLICY_ENTRUST:
|
|
default:
|
|
printf("%s: invalid policy %u\n", __func__, sp->policy);
|
|
/* fall thru... */
|
|
case IPSEC_POLICY_DISCARD:
|
|
ipsec4stat.ips_out_polvio++;
|
|
*error = -EINVAL; /* packet is discarded by caller */
|
|
break;
|
|
case IPSEC_POLICY_BYPASS:
|
|
case IPSEC_POLICY_NONE:
|
|
KEY_FREESP(&sp);
|
|
sp = NULL; /* NB: force NULL result */
|
|
break;
|
|
case IPSEC_POLICY_IPSEC:
|
|
if (sp->req == NULL) /* acquire an SA */
|
|
*error = key_spdacquire(sp);
|
|
break;
|
|
}
|
|
if (*error != 0) {
|
|
KEY_FREESP(&sp);
|
|
sp = NULL;
|
|
}
|
|
return sp;
|
|
}
|
|
|
|
static int
|
|
ipsec4_setspidx_inpcb(m, pcb)
|
|
struct mbuf *m;
|
|
struct inpcb *pcb;
|
|
{
|
|
int error;
|
|
|
|
IPSEC_ASSERT(pcb != NULL, ("null pcb"));
|
|
IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp"));
|
|
IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
|
|
("null sp_in || sp_out"));
|
|
|
|
error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
|
|
if (error == 0) {
|
|
pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
|
|
pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
|
|
pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
|
|
} else {
|
|
bzero(&pcb->inp_sp->sp_in->spidx,
|
|
sizeof (pcb->inp_sp->sp_in->spidx));
|
|
bzero(&pcb->inp_sp->sp_out->spidx,
|
|
sizeof (pcb->inp_sp->sp_in->spidx));
|
|
}
|
|
return error;
|
|
}
|
|
|
|
#ifdef INET6
|
|
static int
|
|
ipsec6_setspidx_in6pcb(m, pcb)
|
|
struct mbuf *m;
|
|
struct in6pcb *pcb;
|
|
{
|
|
struct secpolicyindex *spidx;
|
|
int error;
|
|
|
|
IPSEC_ASSERT(pcb != NULL, ("null pcb"));
|
|
IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp"));
|
|
IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
|
|
("null sp_in || sp_out"));
|
|
|
|
bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
|
|
bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
|
|
|
|
spidx = &pcb->in6p_sp->sp_in->spidx;
|
|
error = ipsec_setspidx(m, spidx, 1);
|
|
if (error)
|
|
goto bad;
|
|
spidx->dir = IPSEC_DIR_INBOUND;
|
|
|
|
spidx = &pcb->in6p_sp->sp_out->spidx;
|
|
error = ipsec_setspidx(m, spidx, 1);
|
|
if (error)
|
|
goto bad;
|
|
spidx->dir = IPSEC_DIR_OUTBOUND;
|
|
|
|
return 0;
|
|
|
|
bad:
|
|
bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
|
|
bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* configure security policy index (src/dst/proto/sport/dport)
|
|
* by looking at the content of mbuf.
|
|
* the caller is responsible for error recovery (like clearing up spidx).
|
|
*/
|
|
static int
|
|
ipsec_setspidx(m, spidx, needport)
|
|
struct mbuf *m;
|
|
struct secpolicyindex *spidx;
|
|
int needport;
|
|
{
|
|
struct ip *ip = NULL;
|
|
struct ip ipbuf;
|
|
u_int v;
|
|
struct mbuf *n;
|
|
int len;
|
|
int error;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("null mbuf"));
|
|
|
|
/*
|
|
* validate m->m_pkthdr.len. we see incorrect length if we
|
|
* mistakenly call this function with inconsistent mbuf chain
|
|
* (like 4.4BSD tcp/udp processing). XXX should we panic here?
|
|
*/
|
|
len = 0;
|
|
for (n = m; n; n = n->m_next)
|
|
len += n->m_len;
|
|
if (m->m_pkthdr.len != len) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n",
|
|
__func__, len, m->m_pkthdr.len));
|
|
return EINVAL;
|
|
}
|
|
|
|
if (m->m_pkthdr.len < sizeof(struct ip)) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("%s: pkthdr len(%d) too small (v4), ignored.\n",
|
|
__func__, m->m_pkthdr.len));
|
|
return EINVAL;
|
|
}
|
|
|
|
if (m->m_len >= sizeof(*ip))
|
|
ip = mtod(m, struct ip *);
|
|
else {
|
|
m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
|
|
ip = &ipbuf;
|
|
}
|
|
#ifdef _IP_VHL
|
|
v = _IP_VHL_V(ip->ip_vhl);
|
|
#else
|
|
v = ip->ip_v;
|
|
#endif
|
|
switch (v) {
|
|
case 4:
|
|
error = ipsec4_setspidx_ipaddr(m, spidx);
|
|
if (error)
|
|
return error;
|
|
ipsec4_get_ulp(m, spidx, needport);
|
|
return 0;
|
|
#ifdef INET6
|
|
case 6:
|
|
if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("%s: pkthdr len(%d) too small (v6), "
|
|
"ignored\n", __func__, m->m_pkthdr.len));
|
|
return EINVAL;
|
|
}
|
|
error = ipsec6_setspidx_ipaddr(m, spidx);
|
|
if (error)
|
|
return error;
|
|
ipsec6_get_ulp(m, spidx, needport);
|
|
return 0;
|
|
#endif
|
|
default:
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("%s: " "unknown IP version %u, ignored.\n",
|
|
__func__, v));
|
|
return EINVAL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
|
|
{
|
|
u_int8_t nxt;
|
|
int off;
|
|
|
|
/* sanity check */
|
|
IPSEC_ASSERT(m != NULL, ("null mbuf"));
|
|
IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short"));
|
|
|
|
/* NB: ip_input() flips it into host endian XXX need more checking */
|
|
if (m->m_len < sizeof (struct ip)) {
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
if (ip->ip_off & (IP_MF | IP_OFFMASK))
|
|
goto done;
|
|
#ifdef _IP_VHL
|
|
off = _IP_VHL_HL(ip->ip_vhl) << 2;
|
|
#else
|
|
off = ip->ip_hl << 2;
|
|
#endif
|
|
nxt = ip->ip_p;
|
|
} else {
|
|
struct ip ih;
|
|
|
|
m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
|
|
if (ih.ip_off & (IP_MF | IP_OFFMASK))
|
|
goto done;
|
|
#ifdef _IP_VHL
|
|
off = _IP_VHL_HL(ih.ip_vhl) << 2;
|
|
#else
|
|
off = ih.ip_hl << 2;
|
|
#endif
|
|
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;
|
|
}
|
|
|
|
/* assumes that m is sane */
|
|
static int
|
|
ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
|
|
{
|
|
static const struct sockaddr_in template = {
|
|
sizeof (struct sockaddr_in),
|
|
AF_INET,
|
|
0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
|
|
};
|
|
|
|
spidx->src.sin = template;
|
|
spidx->dst.sin = template;
|
|
|
|
if (m->m_len < sizeof (struct ip)) {
|
|
m_copydata(m, offsetof(struct ip, ip_src),
|
|
sizeof (struct in_addr),
|
|
(caddr_t) &spidx->src.sin.sin_addr);
|
|
m_copydata(m, offsetof(struct ip, ip_dst),
|
|
sizeof (struct in_addr),
|
|
(caddr_t) &spidx->dst.sin.sin_addr);
|
|
} else {
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
spidx->src.sin.sin_addr = ip->ip_src;
|
|
spidx->dst.sin.sin_addr = ip->ip_dst;
|
|
}
|
|
|
|
spidx->prefs = sizeof(struct in_addr) << 3;
|
|
spidx->prefd = sizeof(struct in_addr) << 3;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef INET6
|
|
static void
|
|
ipsec6_get_ulp(m, spidx, needport)
|
|
struct mbuf *m;
|
|
struct secpolicyindex *spidx;
|
|
int needport;
|
|
{
|
|
int off, nxt;
|
|
struct tcphdr th;
|
|
struct udphdr uh;
|
|
struct icmp6_hdr ih;
|
|
|
|
/* sanity check */
|
|
if (m == NULL)
|
|
panic("%s: NULL pointer was passed.\n", __func__);
|
|
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("%s:\n", __func__); kdebug_mbuf(m));
|
|
|
|
/* set default */
|
|
spidx->ul_proto = IPSEC_ULPROTO_ANY;
|
|
((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
|
|
((struct sockaddr_in6 *)&spidx->dst)->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);
|
|
((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
|
|
((struct sockaddr_in6 *)&spidx->dst)->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);
|
|
((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
|
|
((struct sockaddr_in6 *)&spidx->dst)->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);
|
|
((struct sockaddr_in6 *)&spidx->src)->sin6_port =
|
|
htons((uint16_t)ih.icmp6_type);
|
|
((struct sockaddr_in6 *)&spidx->dst)->sin6_port =
|
|
htons((uint16_t)ih.icmp6_code);
|
|
break;
|
|
default:
|
|
/* XXX intermediate headers??? */
|
|
spidx->ul_proto = nxt;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* assumes that m is sane */
|
|
static int
|
|
ipsec6_setspidx_ipaddr(m, spidx)
|
|
struct mbuf *m;
|
|
struct secpolicyindex *spidx;
|
|
{
|
|
struct ip6_hdr *ip6 = NULL;
|
|
struct ip6_hdr ip6buf;
|
|
struct sockaddr_in6 *sin6;
|
|
|
|
if (m->m_len >= sizeof(*ip6))
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
else {
|
|
m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
|
|
ip6 = &ip6buf;
|
|
}
|
|
|
|
sin6 = (struct sockaddr_in6 *)&spidx->src;
|
|
bzero(sin6, sizeof(*sin6));
|
|
sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_len = sizeof(struct sockaddr_in6);
|
|
bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
|
|
sin6->sin6_addr.s6_addr16[1] = 0;
|
|
sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
|
|
}
|
|
spidx->prefs = sizeof(struct in6_addr) << 3;
|
|
|
|
sin6 = (struct sockaddr_in6 *)&spidx->dst;
|
|
bzero(sin6, sizeof(*sin6));
|
|
sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_len = sizeof(struct sockaddr_in6);
|
|
bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
|
|
sin6->sin6_addr.s6_addr16[1] = 0;
|
|
sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
|
|
}
|
|
spidx->prefd = sizeof(struct in6_addr) << 3;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
ipsec_delpcbpolicy(p)
|
|
struct inpcbpolicy *p;
|
|
{
|
|
free(p, M_IPSEC_INPCB);
|
|
}
|
|
|
|
/* initialize policy in PCB */
|
|
int
|
|
ipsec_init_policy(so, pcb_sp)
|
|
struct socket *so;
|
|
struct inpcbpolicy **pcb_sp;
|
|
{
|
|
struct inpcbpolicy *new;
|
|
|
|
/* sanity check. */
|
|
if (so == NULL || pcb_sp == NULL)
|
|
panic("%s: NULL pointer was passed.\n", __func__);
|
|
|
|
new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
|
|
M_IPSEC_INPCB, M_NOWAIT|M_ZERO);
|
|
if (new == NULL) {
|
|
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
|
|
return ENOBUFS;
|
|
}
|
|
|
|
new->priv = IPSEC_IS_PRIVILEGED_SO(so);
|
|
|
|
if ((new->sp_in = KEY_NEWSP()) == NULL) {
|
|
ipsec_delpcbpolicy(new);
|
|
return ENOBUFS;
|
|
}
|
|
new->sp_in->state = IPSEC_SPSTATE_ALIVE;
|
|
new->sp_in->policy = IPSEC_POLICY_ENTRUST;
|
|
|
|
if ((new->sp_out = KEY_NEWSP()) == NULL) {
|
|
KEY_FREESP(&new->sp_in);
|
|
ipsec_delpcbpolicy(new);
|
|
return ENOBUFS;
|
|
}
|
|
new->sp_out->state = IPSEC_SPSTATE_ALIVE;
|
|
new->sp_out->policy = IPSEC_POLICY_ENTRUST;
|
|
|
|
*pcb_sp = new;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* copy old ipsec policy into new */
|
|
int
|
|
ipsec_copy_policy(old, new)
|
|
struct inpcbpolicy *old, *new;
|
|
{
|
|
struct secpolicy *sp;
|
|
|
|
sp = ipsec_deepcopy_policy(old->sp_in);
|
|
if (sp) {
|
|
KEY_FREESP(&new->sp_in);
|
|
new->sp_in = sp;
|
|
} else
|
|
return ENOBUFS;
|
|
|
|
sp = ipsec_deepcopy_policy(old->sp_out);
|
|
if (sp) {
|
|
KEY_FREESP(&new->sp_out);
|
|
new->sp_out = sp;
|
|
} else
|
|
return ENOBUFS;
|
|
|
|
new->priv = old->priv;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct ipsecrequest *
|
|
ipsec_newisr(void)
|
|
{
|
|
struct ipsecrequest *p;
|
|
|
|
p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO);
|
|
if (p != NULL)
|
|
IPSECREQUEST_LOCK_INIT(p);
|
|
return p;
|
|
}
|
|
|
|
void
|
|
ipsec_delisr(struct ipsecrequest *p)
|
|
{
|
|
IPSECREQUEST_LOCK_DESTROY(p);
|
|
free(p, M_IPSEC_SR);
|
|
}
|
|
|
|
/* deep-copy a policy in PCB */
|
|
static struct secpolicy *
|
|
ipsec_deepcopy_policy(src)
|
|
struct secpolicy *src;
|
|
{
|
|
struct ipsecrequest *newchain = NULL;
|
|
struct ipsecrequest *p;
|
|
struct ipsecrequest **q;
|
|
struct ipsecrequest *r;
|
|
struct secpolicy *dst;
|
|
|
|
if (src == NULL)
|
|
return NULL;
|
|
dst = KEY_NEWSP();
|
|
if (dst == NULL)
|
|
return NULL;
|
|
|
|
/*
|
|
* deep-copy IPsec request chain. This is required since struct
|
|
* ipsecrequest is not reference counted.
|
|
*/
|
|
q = &newchain;
|
|
for (p = src->req; p; p = p->next) {
|
|
*q = ipsec_newisr();
|
|
if (*q == NULL)
|
|
goto fail;
|
|
(*q)->saidx.proto = p->saidx.proto;
|
|
(*q)->saidx.mode = p->saidx.mode;
|
|
(*q)->level = p->level;
|
|
(*q)->saidx.reqid = p->saidx.reqid;
|
|
|
|
bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
|
|
bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
|
|
|
|
(*q)->sp = dst;
|
|
|
|
q = &((*q)->next);
|
|
}
|
|
|
|
dst->req = newchain;
|
|
dst->state = src->state;
|
|
dst->policy = src->policy;
|
|
/* do not touch the refcnt fields */
|
|
|
|
return dst;
|
|
|
|
fail:
|
|
for (p = newchain; p; p = r) {
|
|
r = p->next;
|
|
ipsec_delisr(p);
|
|
p = NULL;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* set policy and ipsec request if present. */
|
|
static int
|
|
ipsec_set_policy(pcb_sp, optname, request, len, priv)
|
|
struct secpolicy **pcb_sp;
|
|
int optname;
|
|
caddr_t request;
|
|
size_t len;
|
|
int priv;
|
|
{
|
|
struct sadb_x_policy *xpl;
|
|
struct secpolicy *newsp = NULL;
|
|
int error;
|
|
|
|
/* sanity check. */
|
|
if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
|
|
return EINVAL;
|
|
if (len < sizeof(*xpl))
|
|
return EINVAL;
|
|
xpl = (struct sadb_x_policy *)request;
|
|
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("%s: passed policy\n", __func__);
|
|
kdebug_sadb_x_policy((struct sadb_ext *)xpl));
|
|
|
|
/* check policy type */
|
|
/* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
|
|
if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
|
|
|| xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
|
|
return EINVAL;
|
|
|
|
/* check privileged socket */
|
|
if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
|
|
return EACCES;
|
|
|
|
/* allocation new SP entry */
|
|
if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
|
|
return error;
|
|
|
|
newsp->state = IPSEC_SPSTATE_ALIVE;
|
|
|
|
/* clear old SP and set new SP */
|
|
KEY_FREESP(pcb_sp);
|
|
*pcb_sp = newsp;
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("%s: new policy\n", __func__);
|
|
kdebug_secpolicy(newsp));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ipsec_get_policy(pcb_sp, mp)
|
|
struct secpolicy *pcb_sp;
|
|
struct mbuf **mp;
|
|
{
|
|
|
|
/* sanity check. */
|
|
if (pcb_sp == NULL || mp == NULL)
|
|
return EINVAL;
|
|
|
|
*mp = key_sp2msg(pcb_sp);
|
|
if (!*mp) {
|
|
ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
|
|
return ENOBUFS;
|
|
}
|
|
|
|
(*mp)->m_type = MT_DATA;
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("%s:\n", __func__); kdebug_mbuf(*mp));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ipsec4_set_policy(inp, optname, request, len, priv)
|
|
struct inpcb *inp;
|
|
int optname;
|
|
caddr_t request;
|
|
size_t len;
|
|
int priv;
|
|
{
|
|
struct sadb_x_policy *xpl;
|
|
struct secpolicy **pcb_sp;
|
|
|
|
/* sanity check. */
|
|
if (inp == NULL || request == NULL)
|
|
return EINVAL;
|
|
if (len < sizeof(*xpl))
|
|
return EINVAL;
|
|
xpl = (struct sadb_x_policy *)request;
|
|
|
|
/* select direction */
|
|
switch (xpl->sadb_x_policy_dir) {
|
|
case IPSEC_DIR_INBOUND:
|
|
pcb_sp = &inp->inp_sp->sp_in;
|
|
break;
|
|
case IPSEC_DIR_OUTBOUND:
|
|
pcb_sp = &inp->inp_sp->sp_out;
|
|
break;
|
|
default:
|
|
ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
|
|
xpl->sadb_x_policy_dir));
|
|
return EINVAL;
|
|
}
|
|
|
|
return ipsec_set_policy(pcb_sp, optname, request, len, priv);
|
|
}
|
|
|
|
int
|
|
ipsec4_get_policy(inp, request, len, mp)
|
|
struct inpcb *inp;
|
|
caddr_t request;
|
|
size_t len;
|
|
struct mbuf **mp;
|
|
{
|
|
struct sadb_x_policy *xpl;
|
|
struct secpolicy *pcb_sp;
|
|
|
|
/* sanity check. */
|
|
if (inp == NULL || request == NULL || mp == NULL)
|
|
return EINVAL;
|
|
IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp"));
|
|
if (len < sizeof(*xpl))
|
|
return EINVAL;
|
|
xpl = (struct sadb_x_policy *)request;
|
|
|
|
/* select direction */
|
|
switch (xpl->sadb_x_policy_dir) {
|
|
case IPSEC_DIR_INBOUND:
|
|
pcb_sp = inp->inp_sp->sp_in;
|
|
break;
|
|
case IPSEC_DIR_OUTBOUND:
|
|
pcb_sp = inp->inp_sp->sp_out;
|
|
break;
|
|
default:
|
|
ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
|
|
xpl->sadb_x_policy_dir));
|
|
return EINVAL;
|
|
}
|
|
|
|
return ipsec_get_policy(pcb_sp, mp);
|
|
}
|
|
|
|
/* delete policy in PCB */
|
|
int
|
|
ipsec4_delete_pcbpolicy(inp)
|
|
struct inpcb *inp;
|
|
{
|
|
IPSEC_ASSERT(inp != NULL, ("null inp"));
|
|
|
|
if (inp->inp_sp == NULL)
|
|
return 0;
|
|
|
|
if (inp->inp_sp->sp_in != NULL)
|
|
KEY_FREESP(&inp->inp_sp->sp_in);
|
|
|
|
if (inp->inp_sp->sp_out != NULL)
|
|
KEY_FREESP(&inp->inp_sp->sp_out);
|
|
|
|
ipsec_delpcbpolicy(inp->inp_sp);
|
|
inp->inp_sp = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef INET6
|
|
int
|
|
ipsec6_set_policy(in6p, optname, request, len, priv)
|
|
struct in6pcb *in6p;
|
|
int optname;
|
|
caddr_t request;
|
|
size_t len;
|
|
int priv;
|
|
{
|
|
struct sadb_x_policy *xpl;
|
|
struct secpolicy **pcb_sp;
|
|
|
|
/* sanity check. */
|
|
if (in6p == NULL || request == NULL)
|
|
return EINVAL;
|
|
if (len < sizeof(*xpl))
|
|
return EINVAL;
|
|
xpl = (struct sadb_x_policy *)request;
|
|
|
|
/* select direction */
|
|
switch (xpl->sadb_x_policy_dir) {
|
|
case IPSEC_DIR_INBOUND:
|
|
pcb_sp = &in6p->in6p_sp->sp_in;
|
|
break;
|
|
case IPSEC_DIR_OUTBOUND:
|
|
pcb_sp = &in6p->in6p_sp->sp_out;
|
|
break;
|
|
default:
|
|
ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
|
|
xpl->sadb_x_policy_dir));
|
|
return EINVAL;
|
|
}
|
|
|
|
return ipsec_set_policy(pcb_sp, optname, request, len, priv);
|
|
}
|
|
|
|
int
|
|
ipsec6_get_policy(in6p, request, len, mp)
|
|
struct in6pcb *in6p;
|
|
caddr_t request;
|
|
size_t len;
|
|
struct mbuf **mp;
|
|
{
|
|
struct sadb_x_policy *xpl;
|
|
struct secpolicy *pcb_sp;
|
|
|
|
/* sanity check. */
|
|
if (in6p == NULL || request == NULL || mp == NULL)
|
|
return EINVAL;
|
|
IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp"));
|
|
if (len < sizeof(*xpl))
|
|
return EINVAL;
|
|
xpl = (struct sadb_x_policy *)request;
|
|
|
|
/* select direction */
|
|
switch (xpl->sadb_x_policy_dir) {
|
|
case IPSEC_DIR_INBOUND:
|
|
pcb_sp = in6p->in6p_sp->sp_in;
|
|
break;
|
|
case IPSEC_DIR_OUTBOUND:
|
|
pcb_sp = in6p->in6p_sp->sp_out;
|
|
break;
|
|
default:
|
|
ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
|
|
xpl->sadb_x_policy_dir));
|
|
return EINVAL;
|
|
}
|
|
|
|
return ipsec_get_policy(pcb_sp, mp);
|
|
}
|
|
|
|
int
|
|
ipsec6_delete_pcbpolicy(in6p)
|
|
struct in6pcb *in6p;
|
|
{
|
|
IPSEC_ASSERT(in6p != NULL, ("null in6p"));
|
|
|
|
if (in6p->in6p_sp == NULL)
|
|
return 0;
|
|
|
|
if (in6p->in6p_sp->sp_in != NULL)
|
|
KEY_FREESP(&in6p->in6p_sp->sp_in);
|
|
|
|
if (in6p->in6p_sp->sp_out != NULL)
|
|
KEY_FREESP(&in6p->in6p_sp->sp_out);
|
|
|
|
ipsec_delpcbpolicy(in6p->in6p_sp);
|
|
in6p->in6p_sp = NULL;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* return current level.
|
|
* Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
|
|
*/
|
|
u_int
|
|
ipsec_get_reqlevel(isr)
|
|
struct ipsecrequest *isr;
|
|
{
|
|
u_int level = 0;
|
|
u_int esp_trans_deflev, esp_net_deflev;
|
|
u_int ah_trans_deflev, ah_net_deflev;
|
|
|
|
IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument"));
|
|
IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
|
|
("af family mismatch, src %u, dst %u",
|
|
isr->sp->spidx.src.sa.sa_family,
|
|
isr->sp->spidx.dst.sa.sa_family));
|
|
|
|
/* 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) \
|
|
? (ipsec_debug \
|
|
? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
|
|
(lev), IPSEC_LEVEL_REQUIRE) \
|
|
: 0), \
|
|
(lev) = IPSEC_LEVEL_REQUIRE, \
|
|
(lev) \
|
|
: (lev))
|
|
|
|
/* set default level */
|
|
switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
|
|
esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
|
|
ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
|
|
ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
|
|
esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
|
|
ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
|
|
ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
panic("%s: unknown af %u",
|
|
__func__, isr->sp->spidx.src.sa.sa_family);
|
|
}
|
|
|
|
#undef IPSEC_CHECK_DEFAULT
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
int
|
|
ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
|
|
{
|
|
struct ipsecrequest *isr;
|
|
int need_auth;
|
|
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
|
|
printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
|
|
|
|
/* 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));
|
|
|
|
/* XXX should compare policy against ipsec header history */
|
|
|
|
need_auth = 0;
|
|
for (isr = sp->req; isr != NULL; isr = isr->next) {
|
|
if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
|
|
continue;
|
|
switch (isr->saidx.proto) {
|
|
case IPPROTO_ESP:
|
|
if ((m->m_flags & M_DECRYPTED) == 0) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("%s: ESP m_flags:%x\n", __func__,
|
|
m->m_flags));
|
|
return 1;
|
|
}
|
|
|
|
if (!need_auth &&
|
|
isr->sav != NULL &&
|
|
isr->sav->tdb_authalgxform != NULL &&
|
|
(m->m_flags & M_AUTHIPDGM) == 0) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("%s: ESP/AH m_flags:%x\n", __func__,
|
|
m->m_flags));
|
|
return 1;
|
|
}
|
|
break;
|
|
case IPPROTO_AH:
|
|
need_auth = 1;
|
|
if ((m->m_flags & M_AUTHIPHDR) == 0) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("%s: AH m_flags:%x\n", __func__,
|
|
m->m_flags));
|
|
return 1;
|
|
}
|
|
break;
|
|
case IPPROTO_IPCOMP:
|
|
/*
|
|
* we don't really care, as IPcomp document
|
|
* says that we shouldn't compress small
|
|
* packets, IPComp policy should always be
|
|
* treated as being in "use" level.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
return 0; /* valid */
|
|
}
|
|
|
|
/*
|
|
* Check AH/ESP integrity.
|
|
* This function is called from tcp_input(), udp_input(),
|
|
* and {ah,esp}4_input for tunnel mode
|
|
*/
|
|
int
|
|
ipsec4_in_reject(m, inp)
|
|
struct mbuf *m;
|
|
struct inpcb *inp;
|
|
{
|
|
struct secpolicy *sp;
|
|
int error;
|
|
int result;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("null mbuf"));
|
|
|
|
/* get SP for this packet.
|
|
* When we are called from ip_forward(), we call
|
|
* ipsec_getpolicybyaddr() with IP_FORWARDING flag.
|
|
*/
|
|
if (inp == NULL)
|
|
sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
|
|
else
|
|
sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
|
|
|
|
if (sp != NULL) {
|
|
result = ipsec_in_reject(sp, m);
|
|
if (result)
|
|
ipsec4stat.ips_in_polvio++;
|
|
KEY_FREESP(&sp);
|
|
} else {
|
|
result = 0; /* XXX should be panic ?
|
|
* -> No, there may be error. */
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#ifdef INET6
|
|
/*
|
|
* Check AH/ESP integrity.
|
|
* This function is called from tcp6_input(), udp6_input(),
|
|
* and {ah,esp}6_input for tunnel mode
|
|
*/
|
|
int
|
|
ipsec6_in_reject(m, inp)
|
|
struct mbuf *m;
|
|
struct inpcb *inp;
|
|
{
|
|
struct secpolicy *sp = NULL;
|
|
int error;
|
|
int result;
|
|
|
|
/* sanity check */
|
|
if (m == NULL)
|
|
return 0; /* XXX should be panic ? */
|
|
|
|
/* get SP for this packet.
|
|
* When we are called from ip_forward(), we call
|
|
* ipsec_getpolicybyaddr() with IP_FORWARDING flag.
|
|
*/
|
|
if (inp == NULL)
|
|
sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
|
|
else
|
|
sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
|
|
|
|
if (sp != NULL) {
|
|
result = ipsec_in_reject(sp, m);
|
|
if (result)
|
|
ipsec6stat.ips_in_polvio++;
|
|
KEY_FREESP(&sp);
|
|
} else {
|
|
result = 0;
|
|
}
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* compute the byte size to be occupied by IPsec header.
|
|
* in case it is tunneled, it includes the size of outer IP header.
|
|
* NOTE: SP passed is free in this function.
|
|
*/
|
|
static size_t
|
|
ipsec_hdrsiz(struct secpolicy *sp)
|
|
{
|
|
struct ipsecrequest *isr;
|
|
size_t siz;
|
|
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
|
|
printf("%s: using SP\n", __func__); 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));
|
|
|
|
siz = 0;
|
|
for (isr = sp->req; isr != NULL; isr = isr->next) {
|
|
size_t clen = 0;
|
|
|
|
switch (isr->saidx.proto) {
|
|
case IPPROTO_ESP:
|
|
clen = esp_hdrsiz(isr->sav);
|
|
break;
|
|
case IPPROTO_AH:
|
|
clen = ah_hdrsiz(isr->sav);
|
|
break;
|
|
case IPPROTO_IPCOMP:
|
|
clen = sizeof(struct ipcomp);
|
|
break;
|
|
}
|
|
|
|
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
|
|
switch (isr->saidx.dst.sa.sa_family) {
|
|
case AF_INET:
|
|
clen += sizeof(struct ip);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
clen += sizeof(struct ip6_hdr);
|
|
break;
|
|
#endif
|
|
default:
|
|
ipseclog((LOG_ERR, "%s: unknown AF %d in "
|
|
"IPsec tunnel SA\n", __func__,
|
|
((struct sockaddr *)&isr->saidx.dst)->sa_family));
|
|
break;
|
|
}
|
|
}
|
|
siz += clen;
|
|
}
|
|
|
|
return siz;
|
|
}
|
|
|
|
/* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
|
|
size_t
|
|
ipsec4_hdrsiz(m, dir, inp)
|
|
struct mbuf *m;
|
|
u_int dir;
|
|
struct inpcb *inp;
|
|
{
|
|
struct secpolicy *sp;
|
|
int error;
|
|
size_t size;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("null mbuf"));
|
|
|
|
/* get SP for this packet.
|
|
* When we are called from ip_forward(), we call
|
|
* ipsec_getpolicybyaddr() with IP_FORWARDING flag.
|
|
*/
|
|
if (inp == NULL)
|
|
sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
|
|
else
|
|
sp = ipsec_getpolicybysock(m, dir, inp, &error);
|
|
|
|
if (sp != NULL) {
|
|
size = ipsec_hdrsiz(sp);
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
|
|
printf("%s: size:%lu.\n", __func__,
|
|
(unsigned long)size));
|
|
|
|
KEY_FREESP(&sp);
|
|
} else {
|
|
size = 0; /* XXX should be panic ?
|
|
* -> No, we are called w/o knowing if
|
|
* IPsec processing is needed. */
|
|
}
|
|
return size;
|
|
}
|
|
|
|
#ifdef INET6
|
|
/* This function is called from ipsec6_hdrsize_tcp(),
|
|
* and maybe from ip6_forward.()
|
|
*/
|
|
size_t
|
|
ipsec6_hdrsiz(m, dir, in6p)
|
|
struct mbuf *m;
|
|
u_int dir;
|
|
struct in6pcb *in6p;
|
|
{
|
|
struct secpolicy *sp;
|
|
int error;
|
|
size_t size;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("null mbuf"));
|
|
IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL,
|
|
("socket w/o inpcb"));
|
|
|
|
/* get SP for this packet */
|
|
/* XXX Is it right to call with IP_FORWARDING. */
|
|
if (in6p == NULL)
|
|
sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
|
|
else
|
|
sp = ipsec_getpolicybysock(m, dir, in6p, &error);
|
|
|
|
if (sp == NULL)
|
|
return 0;
|
|
size = ipsec_hdrsiz(sp);
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
|
|
printf("%s: size:%lu.\n", __func__, (unsigned long)size));
|
|
KEY_FREESP(&sp);
|
|
|
|
return size;
|
|
}
|
|
#endif /*INET6*/
|
|
|
|
/*
|
|
* Check the variable replay window.
|
|
* ipsec_chkreplay() performs replay check before ICV verification.
|
|
* ipsec_updatereplay() updates replay bitmap. This must be called after
|
|
* ICV verification (it also performs replay check, which is usually done
|
|
* beforehand).
|
|
* 0 (zero) is returned if packet disallowed, 1 if packet permitted.
|
|
*
|
|
* based on RFC 2401.
|
|
*/
|
|
int
|
|
ipsec_chkreplay(seq, sav)
|
|
u_int32_t seq;
|
|
struct secasvar *sav;
|
|
{
|
|
const struct secreplay *replay;
|
|
u_int32_t diff;
|
|
int fr;
|
|
u_int32_t wsizeb; /* constant: bits of window size */
|
|
int frlast; /* constant: last frame */
|
|
|
|
IPSEC_SPLASSERT_SOFTNET(__func__);
|
|
|
|
IPSEC_ASSERT(sav != NULL, ("Null SA"));
|
|
IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
|
|
|
|
replay = sav->replay;
|
|
|
|
if (replay->wsize == 0)
|
|
return 1; /* no need to check replay. */
|
|
|
|
/* constant */
|
|
frlast = replay->wsize - 1;
|
|
wsizeb = replay->wsize << 3;
|
|
|
|
/* sequence number of 0 is invalid */
|
|
if (seq == 0)
|
|
return 0;
|
|
|
|
/* first time is always okay */
|
|
if (replay->count == 0)
|
|
return 1;
|
|
|
|
if (seq > replay->lastseq) {
|
|
/* larger sequences are okay */
|
|
return 1;
|
|
} else {
|
|
/* seq is equal or less than lastseq. */
|
|
diff = replay->lastseq - seq;
|
|
|
|
/* over range to check, i.e. too old or wrapped */
|
|
if (diff >= wsizeb)
|
|
return 0;
|
|
|
|
fr = frlast - diff / 8;
|
|
|
|
/* this packet already seen ? */
|
|
if ((replay->bitmap)[fr] & (1 << (diff % 8)))
|
|
return 0;
|
|
|
|
/* out of order but good */
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* check replay counter whether to update or not.
|
|
* OUT: 0: OK
|
|
* 1: NG
|
|
*/
|
|
int
|
|
ipsec_updatereplay(seq, sav)
|
|
u_int32_t seq;
|
|
struct secasvar *sav;
|
|
{
|
|
struct secreplay *replay;
|
|
u_int32_t diff;
|
|
int fr;
|
|
u_int32_t wsizeb; /* constant: bits of window size */
|
|
int frlast; /* constant: last frame */
|
|
|
|
IPSEC_SPLASSERT_SOFTNET(__func__);
|
|
|
|
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 */
|
|
frlast = replay->wsize - 1;
|
|
wsizeb = replay->wsize << 3;
|
|
|
|
/* sequence number of 0 is invalid */
|
|
if (seq == 0)
|
|
return 1;
|
|
|
|
/* first time */
|
|
if (replay->count == 0) {
|
|
replay->lastseq = seq;
|
|
bzero(replay->bitmap, replay->wsize);
|
|
(replay->bitmap)[frlast] = 1;
|
|
goto ok;
|
|
}
|
|
|
|
if (seq > replay->lastseq) {
|
|
/* seq is larger than lastseq. */
|
|
diff = seq - replay->lastseq;
|
|
|
|
/* new larger sequence number */
|
|
if (diff < wsizeb) {
|
|
/* In window */
|
|
/* set bit for this packet */
|
|
vshiftl(replay->bitmap, diff, replay->wsize);
|
|
(replay->bitmap)[frlast] |= 1;
|
|
} else {
|
|
/* this packet has a "way larger" */
|
|
bzero(replay->bitmap, replay->wsize);
|
|
(replay->bitmap)[frlast] = 1;
|
|
}
|
|
replay->lastseq = seq;
|
|
|
|
/* larger is good */
|
|
} else {
|
|
/* seq is equal or less than lastseq. */
|
|
diff = replay->lastseq - seq;
|
|
|
|
/* over range to check, i.e. too old or wrapped */
|
|
if (diff >= wsizeb)
|
|
return 1;
|
|
|
|
fr = frlast - diff / 8;
|
|
|
|
/* this packet already seen ? */
|
|
if ((replay->bitmap)[fr] & (1 << (diff % 8)))
|
|
return 1;
|
|
|
|
/* mark as seen */
|
|
(replay->bitmap)[fr] |= (1 << (diff % 8));
|
|
|
|
/* out of order but good */
|
|
}
|
|
|
|
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)
|
|
return 1;
|
|
|
|
ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n",
|
|
__func__, replay->overflow, ipsec_logsastr(sav)));
|
|
}
|
|
|
|
replay->count++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* shift variable length buffer to left.
|
|
* IN: bitmap: pointer to the buffer
|
|
* nbit: the number of to shift.
|
|
* wsize: buffer size (bytes).
|
|
*/
|
|
static void
|
|
vshiftl(bitmap, nbit, wsize)
|
|
unsigned char *bitmap;
|
|
int nbit, wsize;
|
|
{
|
|
int s, j, i;
|
|
unsigned char over;
|
|
|
|
for (j = 0; j < nbit; j += 8) {
|
|
s = (nbit - j < 8) ? (nbit - j): 8;
|
|
bitmap[0] <<= s;
|
|
for (i = 1; i < wsize; i++) {
|
|
over = (bitmap[i] >> (8 - s));
|
|
bitmap[i] <<= s;
|
|
bitmap[i-1] |= over;
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/* Return a printable string for the IPv4 address. */
|
|
static char *
|
|
inet_ntoa4(struct in_addr ina)
|
|
{
|
|
static char buf[4][4 * sizeof "123" + 4];
|
|
unsigned char *ucp = (unsigned char *) &ina;
|
|
static int i = 3;
|
|
|
|
/* XXX-BZ returns static buffer. */
|
|
i = (i + 1) % 4;
|
|
sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff,
|
|
ucp[2] & 0xff, ucp[3] & 0xff);
|
|
return (buf[i]);
|
|
}
|
|
|
|
/* Return a printable string for the address. */
|
|
char *
|
|
ipsec_address(union sockaddr_union* sa)
|
|
{
|
|
#ifdef INET6
|
|
char ip6buf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
switch (sa->sa.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
return inet_ntoa4(sa->sin.sin_addr);
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr);
|
|
#endif /* INET6 */
|
|
|
|
default:
|
|
return "(unknown address family)";
|
|
}
|
|
}
|
|
|
|
const char *
|
|
ipsec_logsastr(sav)
|
|
struct secasvar *sav;
|
|
{
|
|
static char buf[256];
|
|
char *p;
|
|
struct secasindex *saidx = &sav->sah->saidx;
|
|
|
|
IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
|
|
("address family mismatch"));
|
|
|
|
p = buf;
|
|
snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
|
|
while (p && *p)
|
|
p++;
|
|
/* NB: only use ipsec_address on one address at a time */
|
|
snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
|
|
ipsec_address(&saidx->src));
|
|
while (p && *p)
|
|
p++;
|
|
snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
|
|
ipsec_address(&saidx->dst));
|
|
|
|
return buf;
|
|
}
|
|
|
|
void
|
|
ipsec_dumpmbuf(m)
|
|
struct mbuf *m;
|
|
{
|
|
int totlen;
|
|
int i;
|
|
u_char *p;
|
|
|
|
totlen = 0;
|
|
printf("---\n");
|
|
while (m) {
|
|
p = mtod(m, u_char *);
|
|
for (i = 0; i < m->m_len; i++) {
|
|
printf("%02x ", p[i]);
|
|
totlen++;
|
|
if (totlen % 16 == 0)
|
|
printf("\n");
|
|
}
|
|
m = m->m_next;
|
|
}
|
|
if (totlen % 16 != 0)
|
|
printf("\n");
|
|
printf("---\n");
|
|
}
|
|
|
|
static void
|
|
ipsec_attach(void)
|
|
{
|
|
SECPOLICY_LOCK_INIT(&ip4_def_policy);
|
|
ip4_def_policy.refcnt = 1; /* NB: disallow free */
|
|
}
|
|
SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL)
|
|
|
|
|
|
/* XXX this stuff doesn't belong here... */
|
|
|
|
static struct xformsw* xforms = NULL;
|
|
|
|
/*
|
|
* Register a transform; typically at system startup.
|
|
*/
|
|
void
|
|
xform_register(struct xformsw* xsp)
|
|
{
|
|
xsp->xf_next = xforms;
|
|
xforms = xsp;
|
|
}
|
|
|
|
/*
|
|
* Initialize transform support in an sav.
|
|
*/
|
|
int
|
|
xform_init(struct secasvar *sav, int xftype)
|
|
{
|
|
struct xformsw *xsp;
|
|
|
|
if (sav->tdb_xform != NULL) /* previously initialized */
|
|
return 0;
|
|
for (xsp = xforms; xsp; xsp = xsp->xf_next)
|
|
if (xsp->xf_type == xftype)
|
|
return (*xsp->xf_init)(sav, xsp);
|
|
return EINVAL;
|
|
}
|