6d8fdfa9d5
Currently it has several disadvantages: - it uses single mutex to protect internal structures. It is used by data- and control- path, thus there are no parallelism at all. - it uses single list to keep encap handlers for both INET and INET6 families. - struct encaptab keeps unneeded information (src, dst, masks, protosw), that isn't used by code in the source tree. - matches are prioritized and when many tunneling interfaces are registered, encapcheck handler of each interface is invoked for each packet. The search takes O(n) for n interfaces. All this work is done with exclusive lock held. What this patch includes: - the datapath is converted to be lockless using epoch(9) KPI. - struct encaptab now linked using CK_LIST. - all unused fields removed from struct encaptab. Several new fields addedr: min_length is the minimum packet length, that encapsulation handler expects to see; exact_match is maximum number of bits, that can return an encapsulation handler, when it wants to consume a packet. - IPv6 and IPv4 handlers are stored in separate lists; - added new "encap_lookup_t" method, that will be used later. It is targeted to speedup lookup of needed interface, when gif(4)/gre(4) have many interfaces. - the need to use protosw structure is eliminated. The only pr_input method was used from this structure, so I don't see the need to keep using it. - encap_input_t method changed to avoid using mbuf tags to store softc pointer. Now it is passed directly trough encap_input_t method. encap_getarg() funtions is removed. - all sockaddr structures and code that uses them removed. We don't have any code in the tree that uses them. All consumers use encap_attach_func() method, that relies on invoking of encapcheck() to determine the needed handler. - introduced struct encap_config, it contains parameters of encap handler that is going to be registered by encap_attach() function. - encap handlers are stored in lists ordered by exact_match value, thus handlers that need more bits to match will be checked first, and if encapcheck method returns exact_match value, the search will be stopped. - all current consumers changed to use new KPI. Reviewed by: mmacy Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D15617
778 lines
20 KiB
C
778 lines
20 KiB
C
/* $FreeBSD$ */
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/* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.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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/* IP payload compression protocol (IPComp), see RFC 2393 */
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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/mutex.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/ip_encap.h>
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#include <net/netisr.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 <netinet6/ip6_var.h>
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#include <netipsec/ipsec6.h>
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#endif
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#include <netipsec/ipcomp.h>
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#include <netipsec/ipcomp_var.h>
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#include <netipsec/key.h>
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#include <netipsec/key_debug.h>
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#include <opencrypto/cryptodev.h>
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#include <opencrypto/deflate.h>
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#include <opencrypto/xform.h>
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VNET_DEFINE(int, ipcomp_enable) = 1;
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VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat);
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VNET_PCPUSTAT_SYSINIT(ipcompstat);
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#ifdef VIMAGE
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VNET_PCPUSTAT_SYSUNINIT(ipcompstat);
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#endif /* VIMAGE */
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SYSCTL_DECL(_net_inet_ipcomp);
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SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, "");
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SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats,
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struct ipcompstat, ipcompstat,
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"IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h");
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static int ipcomp_input_cb(struct cryptop *crp);
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static int ipcomp_output_cb(struct cryptop *crp);
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/*
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* RFC 3173 p 2.2. Non-Expansion Policy:
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* If the total size of a compressed payload and the IPComp header, as
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* defined in section 3, is not smaller than the size of the original
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* payload, the IP datagram MUST be sent in the original non-compressed
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* form.
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*
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* When we use IPComp in tunnel mode, for small packets we will receive
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* encapsulated IP-IP datagrams without any compression and without IPComp
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* header.
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*/
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static int
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ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst)
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{
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struct secasvar *sav;
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sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP);
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if (sav == NULL)
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return (0);
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key_freesav(&sav);
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if (src->sa.sa_family == AF_INET)
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return (sizeof(struct in_addr) << 4);
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else
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return (sizeof(struct in6_addr) << 4);
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}
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static int
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ipcomp_nonexp_input(struct mbuf *m, int off, int proto, void *arg __unused)
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{
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int isr;
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switch (proto) {
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#ifdef INET
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case IPPROTO_IPV4:
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isr = NETISR_IP;
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break;
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#endif
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#ifdef INET6
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case IPPROTO_IPV6:
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isr = NETISR_IPV6;
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break;
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#endif
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default:
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IPCOMPSTAT_INC(ipcomps_nopf);
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m_freem(m);
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return (IPPROTO_DONE);
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}
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m_adj(m, off);
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IPCOMPSTAT_ADD(ipcomps_ibytes, m->m_pkthdr.len);
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IPCOMPSTAT_INC(ipcomps_input);
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netisr_dispatch(isr, m);
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return (IPPROTO_DONE);
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}
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/*
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* ipcomp_init() is called when an CPI is being set up.
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*/
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static int
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ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
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{
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const struct comp_algo *tcomp;
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struct cryptoini cric;
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/* NB: algorithm really comes in alg_enc and not alg_comp! */
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tcomp = comp_algorithm_lookup(sav->alg_enc);
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if (tcomp == NULL) {
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DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
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sav->alg_comp));
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return EINVAL;
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}
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sav->alg_comp = sav->alg_enc; /* set for doing histogram */
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sav->tdb_xform = xsp;
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sav->tdb_compalgxform = tcomp;
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/* Initialize crypto session */
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bzero(&cric, sizeof (cric));
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cric.cri_alg = sav->tdb_compalgxform->type;
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return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support);
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}
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/*
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* ipcomp_zeroize() used when IPCA is deleted
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*/
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static int
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ipcomp_zeroize(struct secasvar *sav)
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{
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int err;
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err = crypto_freesession(sav->tdb_cryptoid);
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sav->tdb_cryptoid = 0;
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return err;
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}
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/*
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* ipcomp_input() gets called to uncompress an input packet
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*/
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static int
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ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
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{
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struct xform_data *xd;
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struct cryptodesc *crdc;
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struct cryptop *crp;
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struct ipcomp *ipcomp;
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caddr_t addr;
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int error, hlen = IPCOMP_HLENGTH;
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/*
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* Check that the next header of the IPComp is not IPComp again, before
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* doing any real work. Given it is not possible to do double
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* compression it means someone is playing tricks on us.
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*/
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error = ENOBUFS;
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if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
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IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
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DPRINTF(("%s: m_pullup failed\n", __func__));
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key_freesav(&sav);
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return (error);
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}
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addr = (caddr_t) mtod(m, struct ip *) + skip;
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ipcomp = (struct ipcomp *)addr;
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if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
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IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */
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DPRINTF(("%s: recursive compression detected\n", __func__));
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error = EINVAL;
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goto bad;
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}
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/* Get crypto descriptors */
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crp = crypto_getreq(1);
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if (crp == NULL) {
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DPRINTF(("%s: no crypto descriptors\n", __func__));
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IPCOMPSTAT_INC(ipcomps_crypto);
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goto bad;
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}
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/* Get IPsec-specific opaque pointer */
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xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO);
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if (xd == NULL) {
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DPRINTF(("%s: cannot allocate xform_data\n", __func__));
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IPCOMPSTAT_INC(ipcomps_crypto);
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crypto_freereq(crp);
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goto bad;
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}
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crdc = crp->crp_desc;
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crdc->crd_skip = skip + hlen;
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crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
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crdc->crd_inject = skip;
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/* Decompression operation */
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crdc->crd_alg = sav->tdb_compalgxform->type;
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/* Crypto operation descriptor */
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crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
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crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
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crp->crp_buf = (caddr_t) m;
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crp->crp_callback = ipcomp_input_cb;
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crp->crp_opaque = (caddr_t) xd;
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/* These are passed as-is to the callback */
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xd->sav = sav;
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xd->protoff = protoff;
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xd->skip = skip;
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xd->vnet = curvnet;
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SECASVAR_LOCK(sav);
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crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid;
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SECASVAR_UNLOCK(sav);
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return crypto_dispatch(crp);
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bad:
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m_freem(m);
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key_freesav(&sav);
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return (error);
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}
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/*
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* IPComp input callback from the crypto driver.
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*/
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static int
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ipcomp_input_cb(struct cryptop *crp)
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{
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IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
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struct xform_data *xd;
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struct mbuf *m;
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struct secasvar *sav;
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struct secasindex *saidx;
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caddr_t addr;
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uint64_t cryptoid;
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int hlen = IPCOMP_HLENGTH, error, clen;
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int skip, protoff;
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uint8_t nproto;
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m = (struct mbuf *) crp->crp_buf;
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xd = (struct xform_data *) crp->crp_opaque;
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CURVNET_SET(xd->vnet);
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sav = xd->sav;
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skip = xd->skip;
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protoff = xd->protoff;
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cryptoid = xd->cryptoid;
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saidx = &sav->sah->saidx;
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IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
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saidx->dst.sa.sa_family == AF_INET6,
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("unexpected protocol family %u", saidx->dst.sa.sa_family));
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/* Check for crypto errors */
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if (crp->crp_etype) {
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if (crp->crp_etype == EAGAIN) {
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/* Reset the session ID */
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if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0)
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crypto_freesession(cryptoid);
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xd->cryptoid = crp->crp_sid;
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CURVNET_RESTORE();
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return (crypto_dispatch(crp));
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}
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IPCOMPSTAT_INC(ipcomps_noxform);
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DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
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error = crp->crp_etype;
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goto bad;
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}
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/* Shouldn't happen... */
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if (m == NULL) {
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IPCOMPSTAT_INC(ipcomps_crypto);
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DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
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error = EINVAL;
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goto bad;
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}
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IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
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clen = crp->crp_olen; /* Length of data after processing */
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/* Release the crypto descriptors */
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free(xd, M_XDATA), xd = NULL;
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crypto_freereq(crp), crp = NULL;
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/* In case it's not done already, adjust the size of the mbuf chain */
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m->m_pkthdr.len = clen + hlen + skip;
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if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
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IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
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DPRINTF(("%s: m_pullup failed\n", __func__));
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error = EINVAL; /*XXX*/
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goto bad;
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}
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/* Keep the next protocol field */
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addr = (caddr_t) mtod(m, struct ip *) + skip;
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nproto = ((struct ipcomp *) addr)->comp_nxt;
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/* Remove the IPCOMP header */
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error = m_striphdr(m, skip, hlen);
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if (error) {
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IPCOMPSTAT_INC(ipcomps_hdrops);
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DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
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ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
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(u_long) ntohl(sav->spi)));
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goto bad;
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}
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/* Restore the Next Protocol field */
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m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
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switch (saidx->dst.sa.sa_family) {
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#ifdef INET6
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case AF_INET6:
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error = ipsec6_common_input_cb(m, sav, skip, protoff);
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break;
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#endif
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#ifdef INET
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case AF_INET:
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error = ipsec4_common_input_cb(m, sav, skip, protoff);
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break;
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#endif
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default:
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panic("%s: Unexpected address family: %d saidx=%p", __func__,
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saidx->dst.sa.sa_family, saidx);
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}
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CURVNET_RESTORE();
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return error;
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bad:
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CURVNET_RESTORE();
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if (sav != NULL)
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key_freesav(&sav);
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if (m != NULL)
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m_freem(m);
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if (xd != NULL)
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free(xd, M_XDATA);
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if (crp != NULL)
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crypto_freereq(crp);
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return error;
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}
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/*
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* IPComp output routine, called by ipsec[46]_perform_request()
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*/
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static int
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ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav,
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u_int idx, int skip, int protoff)
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{
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IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
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const struct comp_algo *ipcompx;
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struct cryptodesc *crdc;
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struct cryptop *crp;
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struct xform_data *xd;
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int error, ralen, maxpacketsize;
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IPSEC_ASSERT(sav != NULL, ("null SA"));
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ipcompx = sav->tdb_compalgxform;
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IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
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/*
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* Do not touch the packet in case our payload to compress
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* is lower than the minimal threshold of the compression
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* alogrithm. We will just send out the data uncompressed.
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* See RFC 3173, 2.2. Non-Expansion Policy.
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*/
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if (m->m_pkthdr.len <= ipcompx->minlen) {
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IPCOMPSTAT_INC(ipcomps_threshold);
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return ipsec_process_done(m, sp, sav, idx);
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}
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ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
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IPCOMPSTAT_INC(ipcomps_output);
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/* Check for maximum packet size violations. */
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switch (sav->sah->saidx.dst.sa.sa_family) {
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#ifdef INET
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case AF_INET:
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maxpacketsize = IP_MAXPACKET;
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break;
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#endif /* INET */
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#ifdef INET6
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case AF_INET6:
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maxpacketsize = IPV6_MAXPACKET;
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break;
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#endif /* INET6 */
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default:
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IPCOMPSTAT_INC(ipcomps_nopf);
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DPRINTF(("%s: unknown/unsupported protocol family %d, "
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"IPCA %s/%08lx\n", __func__,
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sav->sah->saidx.dst.sa.sa_family,
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ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
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(u_long) ntohl(sav->spi)));
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error = EPFNOSUPPORT;
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goto bad;
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}
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if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
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IPCOMPSTAT_INC(ipcomps_toobig);
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DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
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"(len %u, max len %u)\n", __func__,
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ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
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(u_long) ntohl(sav->spi),
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ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
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error = EMSGSIZE;
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goto bad;
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}
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/* Update the counters */
|
|
IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip);
|
|
|
|
m = m_unshare(m, M_NOWAIT);
|
|
if (m == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_hdrops);
|
|
DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
|
|
__func__, ipsec_address(&sav->sah->saidx.dst, buf,
|
|
sizeof(buf)), (u_long) ntohl(sav->spi)));
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
|
|
/* Ok now, we can pass to the crypto processing. */
|
|
|
|
/* Get crypto descriptors */
|
|
crp = crypto_getreq(1);
|
|
if (crp == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_crypto);
|
|
DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
crdc = crp->crp_desc;
|
|
|
|
/* Compression descriptor */
|
|
crdc->crd_skip = skip;
|
|
crdc->crd_len = ralen;
|
|
crdc->crd_flags = CRD_F_COMP;
|
|
crdc->crd_inject = skip;
|
|
|
|
/* Compression operation */
|
|
crdc->crd_alg = ipcompx->type;
|
|
|
|
/* IPsec-specific opaque crypto info */
|
|
xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO);
|
|
if (xd == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_crypto);
|
|
DPRINTF(("%s: failed to allocate xform_data\n", __func__));
|
|
crypto_freereq(crp);
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
|
|
xd->sp = sp;
|
|
xd->sav = sav;
|
|
xd->idx = idx;
|
|
xd->skip = skip;
|
|
xd->protoff = protoff;
|
|
xd->vnet = curvnet;
|
|
|
|
/* Crypto operation descriptor */
|
|
crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
|
|
crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
|
|
crp->crp_buf = (caddr_t) m;
|
|
crp->crp_callback = ipcomp_output_cb;
|
|
crp->crp_opaque = (caddr_t) xd;
|
|
|
|
SECASVAR_LOCK(sav);
|
|
crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid;
|
|
SECASVAR_UNLOCK(sav);
|
|
|
|
return crypto_dispatch(crp);
|
|
bad:
|
|
if (m)
|
|
m_freem(m);
|
|
key_freesav(&sav);
|
|
key_freesp(&sp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* IPComp output callback from the crypto driver.
|
|
*/
|
|
static int
|
|
ipcomp_output_cb(struct cryptop *crp)
|
|
{
|
|
IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
|
|
struct xform_data *xd;
|
|
struct secpolicy *sp;
|
|
struct secasvar *sav;
|
|
struct mbuf *m;
|
|
uint64_t cryptoid;
|
|
u_int idx;
|
|
int error, skip, protoff;
|
|
|
|
m = (struct mbuf *) crp->crp_buf;
|
|
xd = (struct xform_data *) crp->crp_opaque;
|
|
CURVNET_SET(xd->vnet);
|
|
idx = xd->idx;
|
|
sp = xd->sp;
|
|
sav = xd->sav;
|
|
skip = xd->skip;
|
|
protoff = xd->protoff;
|
|
cryptoid = xd->cryptoid;
|
|
|
|
/* Check for crypto errors */
|
|
if (crp->crp_etype) {
|
|
if (crp->crp_etype == EAGAIN) {
|
|
/* Reset the session ID */
|
|
if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0)
|
|
crypto_freesession(cryptoid);
|
|
xd->cryptoid = crp->crp_sid;
|
|
CURVNET_RESTORE();
|
|
return (crypto_dispatch(crp));
|
|
}
|
|
IPCOMPSTAT_INC(ipcomps_noxform);
|
|
DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
|
|
error = crp->crp_etype;
|
|
goto bad;
|
|
}
|
|
/* Shouldn't happen... */
|
|
if (m == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_crypto);
|
|
DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
|
|
|
|
if (crp->crp_ilen - skip > crp->crp_olen) {
|
|
struct mbuf *mo;
|
|
struct ipcomp *ipcomp;
|
|
int roff;
|
|
uint8_t prot;
|
|
|
|
/* Compression helped, inject IPCOMP header. */
|
|
mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
|
|
if (mo == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_wrap);
|
|
DPRINTF(("%s: IPCOMP header inject failed "
|
|
"for IPCA %s/%08lx\n",
|
|
__func__, ipsec_address(&sav->sah->saidx.dst, buf,
|
|
sizeof(buf)), (u_long) ntohl(sav->spi)));
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
|
|
|
|
/* Initialize the IPCOMP header */
|
|
/* XXX alignment always correct? */
|
|
switch (sav->sah->saidx.dst.sa.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
|
|
break;
|
|
#endif
|
|
}
|
|
ipcomp->comp_flags = 0;
|
|
ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
|
|
|
|
/* Fix Next Protocol in IPv4/IPv6 header */
|
|
prot = IPPROTO_IPCOMP;
|
|
m_copyback(m, protoff, sizeof(u_int8_t),
|
|
(u_char *)&prot);
|
|
|
|
/* Adjust the length in the IP header */
|
|
switch (sav->sah->saidx.dst.sa.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
mtod(m, struct ip6_hdr *)->ip6_plen =
|
|
htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
IPCOMPSTAT_INC(ipcomps_nopf);
|
|
DPRINTF(("%s: unknown/unsupported protocol "
|
|
"family %d, IPCA %s/%08lx\n", __func__,
|
|
sav->sah->saidx.dst.sa.sa_family,
|
|
ipsec_address(&sav->sah->saidx.dst, buf,
|
|
sizeof(buf)), (u_long) ntohl(sav->spi)));
|
|
error = EPFNOSUPPORT;
|
|
goto bad;
|
|
}
|
|
} else {
|
|
/* Compression was useless, we have lost time. */
|
|
IPCOMPSTAT_INC(ipcomps_uncompr);
|
|
DPRINTF(("%s: compressions was useless %d - %d <= %d\n",
|
|
__func__, crp->crp_ilen, skip, crp->crp_olen));
|
|
/* XXX remember state to not compress the next couple
|
|
* of packets, RFC 3173, 2.2. Non-Expansion Policy */
|
|
}
|
|
|
|
/* Release the crypto descriptor */
|
|
free(xd, M_XDATA);
|
|
crypto_freereq(crp);
|
|
|
|
/* NB: m is reclaimed by ipsec_process_done. */
|
|
error = ipsec_process_done(m, sp, sav, idx);
|
|
CURVNET_RESTORE();
|
|
return (error);
|
|
bad:
|
|
if (m)
|
|
m_freem(m);
|
|
CURVNET_RESTORE();
|
|
free(xd, M_XDATA);
|
|
crypto_freereq(crp);
|
|
key_freesav(&sav);
|
|
key_freesp(&sp);
|
|
return (error);
|
|
}
|
|
|
|
#ifdef INET
|
|
static int
|
|
ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
|
|
void *arg __unused)
|
|
{
|
|
union sockaddr_union src, dst;
|
|
const struct ip *ip;
|
|
|
|
if (V_ipcomp_enable == 0)
|
|
return (0);
|
|
if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
|
|
return (0);
|
|
bzero(&src, sizeof(src));
|
|
bzero(&dst, sizeof(dst));
|
|
src.sa.sa_family = dst.sa.sa_family = AF_INET;
|
|
src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in);
|
|
ip = mtod(m, const struct ip *);
|
|
src.sin.sin_addr = ip->ip_src;
|
|
dst.sin.sin_addr = ip->ip_dst;
|
|
return (ipcomp_encapcheck(&src, &dst));
|
|
}
|
|
|
|
static const struct encaptab *ipe4_cookie = NULL;
|
|
static const struct encap_config ipv4_encap_cfg = {
|
|
.proto = -1,
|
|
.min_length = sizeof(struct ip),
|
|
.exact_match = sizeof(in_addr_t) << 4,
|
|
.check = ipcomp4_nonexp_encapcheck,
|
|
.input = ipcomp_nonexp_input
|
|
};
|
|
#endif
|
|
#ifdef INET6
|
|
static int
|
|
ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
|
|
void *arg __unused)
|
|
{
|
|
union sockaddr_union src, dst;
|
|
const struct ip6_hdr *ip6;
|
|
|
|
if (V_ipcomp_enable == 0)
|
|
return (0);
|
|
if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
|
|
return (0);
|
|
bzero(&src, sizeof(src));
|
|
bzero(&dst, sizeof(dst));
|
|
src.sa.sa_family = dst.sa.sa_family = AF_INET;
|
|
src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
ip6 = mtod(m, const struct ip6_hdr *);
|
|
src.sin6.sin6_addr = ip6->ip6_src;
|
|
dst.sin6.sin6_addr = ip6->ip6_dst;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) {
|
|
/* XXX: sa6_recoverscope() */
|
|
src.sin6.sin6_scope_id =
|
|
ntohs(src.sin6.sin6_addr.s6_addr16[1]);
|
|
src.sin6.sin6_addr.s6_addr16[1] = 0;
|
|
}
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) {
|
|
/* XXX: sa6_recoverscope() */
|
|
dst.sin6.sin6_scope_id =
|
|
ntohs(dst.sin6.sin6_addr.s6_addr16[1]);
|
|
dst.sin6.sin6_addr.s6_addr16[1] = 0;
|
|
}
|
|
return (ipcomp_encapcheck(&src, &dst));
|
|
}
|
|
|
|
static const struct encaptab *ipe6_cookie = NULL;
|
|
static const struct encap_config ipv6_encap_cfg = {
|
|
.proto = -1,
|
|
.min_length = sizeof(struct ip6_hdr),
|
|
.exact_match = sizeof(struct in6_addr) << 4,
|
|
.check = ipcomp6_nonexp_encapcheck,
|
|
.input = ipcomp_nonexp_input
|
|
};
|
|
#endif
|
|
|
|
static struct xformsw ipcomp_xformsw = {
|
|
.xf_type = XF_IPCOMP,
|
|
.xf_name = "IPcomp",
|
|
.xf_init = ipcomp_init,
|
|
.xf_zeroize = ipcomp_zeroize,
|
|
.xf_input = ipcomp_input,
|
|
.xf_output = ipcomp_output,
|
|
};
|
|
|
|
static void
|
|
ipcomp_attach(void)
|
|
{
|
|
|
|
#ifdef INET
|
|
ipe4_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
|
|
#endif
|
|
#ifdef INET6
|
|
ipe6_cookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK);
|
|
#endif
|
|
xform_attach(&ipcomp_xformsw);
|
|
}
|
|
|
|
static void
|
|
ipcomp_detach(void)
|
|
{
|
|
|
|
#ifdef INET
|
|
ip_encap_detach(ipe4_cookie);
|
|
#endif
|
|
#ifdef INET6
|
|
ip6_encap_detach(ipe6_cookie);
|
|
#endif
|
|
xform_detach(&ipcomp_xformsw);
|
|
}
|
|
|
|
SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
|
|
ipcomp_attach, NULL);
|
|
SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
|
|
ipcomp_detach, NULL);
|