89856f7e2d
than removing the network interfaces first. This change is rather larger
and convoluted as the ordering requirements cannot be separated.
Move the pfil(9) framework to SI_SUB_PROTO_PFIL, move Firewalls and
related modules to their own SI_SUB_PROTO_FIREWALL.
Move initialization of "physical" interfaces to SI_SUB_DRIVERS,
move virtual (cloned) interfaces to SI_SUB_PSEUDO.
Move Multicast to SI_SUB_PROTO_MC.
Re-work parts of multicast initialisation and teardown, not taking the
huge amount of memory into account if used as a module yet.
For interface teardown we try to do as many of them as we can on
SI_SUB_INIT_IF, but for some this makes no sense, e.g., when tunnelling
over a higher layer protocol such as IP. In that case the interface
has to go along (or before) the higher layer protocol is shutdown.
Kernel hhooks need to go last on teardown as they may be used at various
higher layers and we cannot remove them before we cleaned up the higher
layers.
For interface teardown there are multiple paths:
(a) a cloned interface is destroyed (inside a VIMAGE or in the base system),
(b) any interface is moved from a virtual network stack to a different
network stack ("vmove"), or (c) a virtual network stack is being shut down.
All code paths go through if_detach_internal() where we, depending on the
vmove flag or the vnet state, make a decision on how much to shut down;
in case we are destroying a VNET the individual protocol layers will
cleanup their own parts thus we cannot do so again for each interface as
we end up with, e.g., double-frees, destroying locks twice or acquiring
already destroyed locks.
When calling into protocol cleanups we equally have to tell them
whether they need to detach upper layer protocols ("ulp") or not
(e.g., in6_ifdetach()).
Provide or enahnce helper functions to do proper cleanup at a protocol
rather than at an interface level.
Approved by: re (hrs)
Obtained from: projects/vnet
Reviewed by: gnn, jhb
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D6747
171 lines
4.7 KiB
C
171 lines
4.7 KiB
C
/* $FreeBSD$ */
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/*-
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* Copyright (c) 2003 Bruce M. Simpson <bms@spc.org>
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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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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/* TCP MD5 Signature Option (RFC2385) */
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/lock.h>
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#include <sys/socket.h>
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#include <sys/kernel.h>
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#include <sys/protosw.h>
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#include <sys/sysctl.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/tcp.h>
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#include <netinet/tcp_var.h>
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#include <net/vnet.h>
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#include <netipsec/ipsec.h>
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#include <netipsec/xform.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netipsec/ipsec6.h>
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#endif
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#include <netipsec/key.h>
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#include <netipsec/key_debug.h>
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/*
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* Initialize a TCP-MD5 SA. Called when the SA is being set up.
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*
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* We don't need to set up the tdb prefixed fields, as we don't use the
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* opencrypto code; we just perform a key length check.
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*
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* XXX: Currently we only allow a single 'magic' SPI to be used.
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*
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* This allows per-host granularity without affecting the userland
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* interface, which is a simple socket option toggle switch,
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* TCP_SIGNATURE_ENABLE.
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*
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* To allow per-service granularity requires that we have a means
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* of mapping port to SPI. The mandated way of doing this is to
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* use SPD entries to specify packet flows which get the TCP-MD5
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* treatment, however the code to do this is currently unstable
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* and unsuitable for production use.
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*
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* Therefore we use this compromise in the meantime.
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*/
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static int
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tcpsignature_init(struct secasvar *sav, struct xformsw *xsp)
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{
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int keylen;
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if (sav->spi != htonl(TCP_SIG_SPI)) {
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DPRINTF(("%s: SPI must be TCP_SIG_SPI (0x1000)\n",
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__func__));
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return (EINVAL);
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}
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if (sav->alg_auth != SADB_X_AALG_TCP_MD5) {
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DPRINTF(("%s: unsupported authentication algorithm %u\n",
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__func__, sav->alg_auth));
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return (EINVAL);
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}
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if (sav->key_auth == NULL) {
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DPRINTF(("%s: no authentication key present\n", __func__));
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return (EINVAL);
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}
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keylen = _KEYLEN(sav->key_auth);
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if ((keylen < TCP_KEYLEN_MIN) || (keylen > TCP_KEYLEN_MAX)) {
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DPRINTF(("%s: invalid key length %u\n", __func__, keylen));
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return (EINVAL);
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}
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return (0);
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}
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/*
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* Paranoia.
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*
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* Called when the SA is deleted.
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*/
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static int
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tcpsignature_zeroize(struct secasvar *sav)
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{
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if (sav->key_auth)
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bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
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sav->tdb_cryptoid = 0;
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sav->tdb_authalgxform = NULL;
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sav->tdb_xform = NULL;
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return (0);
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}
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/*
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* Verify that an input packet passes authentication.
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* Called from the ipsec layer.
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* We do this from within tcp itself, so this routine is just a stub.
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*/
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static int
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tcpsignature_input(struct mbuf *m, struct secasvar *sav, int skip,
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int protoff)
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{
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return (0);
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}
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/*
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* Prepend the authentication header.
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* Called from the ipsec layer.
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* We do this from within tcp itself, so this routine is just a stub.
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*/
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static int
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tcpsignature_output(struct mbuf *m, struct ipsecrequest *isr,
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struct mbuf **mp, int skip, int protoff)
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{
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return (EINVAL);
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}
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static struct xformsw tcpsignature_xformsw = {
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XF_TCPSIGNATURE, XFT_AUTH, "TCPMD5",
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tcpsignature_init, tcpsignature_zeroize,
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tcpsignature_input, tcpsignature_output
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};
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static void
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tcpsignature_attach(void)
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{
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xform_register(&tcpsignature_xformsw);
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}
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SYSINIT(tcpsignature_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
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tcpsignature_attach, NULL);
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