0fb6ad528e
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
149 lines
4.1 KiB
C
149 lines
4.1 KiB
C
/*-
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* Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org>
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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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*
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/priv.h>
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#include <sys/rmlock.h>
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#include <sys/socket.h>
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#include <sys/sockopt.h>
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#include <sys/syslog.h>
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#include <sys/proc.h>
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#include <netinet/in.h>
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#include <netinet/in_pcb.h>
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#include <netipsec/ipsec.h>
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#include <netipsec/ipsec6.h>
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#include <netipsec/key.h>
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#include <netipsec/key_debug.h>
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#include <netipsec/ipsec_support.h>
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#ifdef INET
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static const struct ipsec_methods ipv4_methods = {
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.input = ipsec4_input,
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.forward = ipsec4_forward,
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.output = ipsec4_output,
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.pcbctl = ipsec4_pcbctl,
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.capability = ipsec4_capability,
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.check_policy = ipsec4_in_reject,
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.hdrsize = ipsec_hdrsiz_inpcb,
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.udp_input = udp_ipsec_input,
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.udp_pcbctl = udp_ipsec_pcbctl,
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};
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#ifndef KLD_MODULE
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static const struct ipsec_support ipv4_ipsec = {
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.enabled = IPSEC_MODULE_ENABLED,
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.methods = &ipv4_methods
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};
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const struct ipsec_support * const ipv4_ipsec_support = &ipv4_ipsec;
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#endif /* !KLD_MODULE */
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#endif /* INET */
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#ifdef INET6
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static const struct ipsec_methods ipv6_methods = {
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.input = ipsec6_input,
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.forward = ipsec6_forward,
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.output = ipsec6_output,
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.pcbctl = ipsec6_pcbctl,
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.capability = ipsec6_capability,
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.check_policy = ipsec6_in_reject,
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.hdrsize = ipsec_hdrsiz_inpcb,
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};
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#ifndef KLD_MODULE
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static const struct ipsec_support ipv6_ipsec = {
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.enabled = IPSEC_MODULE_ENABLED,
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.methods = &ipv6_methods
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};
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const struct ipsec_support * const ipv6_ipsec_support = &ipv6_ipsec;
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#endif /* !KLD_MODULE */
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#endif /* INET6 */
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/*
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* Always register ipsec module.
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* Even when IPsec is build in the kernel, we need to have
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* module registered. This will prevent to load ipsec.ko.
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*/
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static int
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ipsec_modevent(module_t mod, int type, void *data)
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{
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switch (type) {
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case MOD_LOAD:
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/* All xforms are registered via SYSINIT */
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if (!ipsec_initialized())
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return (ENOMEM);
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#ifdef KLD_MODULE
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#ifdef INET
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ipsec_support_enable(ipv4_ipsec_support, &ipv4_methods);
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#endif
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#ifdef INET6
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ipsec_support_enable(ipv6_ipsec_support, &ipv6_methods);
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#endif
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#endif /* KLD_MODULE */
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break;
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case MOD_UNLOAD:
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/* All xforms are unregistered via SYSUNINIT */
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#ifdef KLD_MODULE
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#ifdef INET
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ipsec_support_disable(ipv4_ipsec_support);
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#endif
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#ifdef INET6
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ipsec_support_disable(ipv6_ipsec_support);
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#endif
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#endif /* KLD_MODULE */
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break;
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default:
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return (EOPNOTSUPP);
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}
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return (0);
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}
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static moduledata_t ipsec_mod = {
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"ipsec",
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ipsec_modevent,
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0
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};
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DECLARE_MODULE(ipsec, ipsec_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
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MODULE_VERSION(ipsec, 1);
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#ifdef KLD_MODULE
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MODULE_DEPEND(ipsec, ipsec_support, 1, 1, 1);
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#endif
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