600 lines
15 KiB
C
600 lines
15 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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* 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 <net/route.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/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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int ipcomp_enable = 0;
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struct ipcompstat ipcompstat;
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SYSCTL_DECL(_net_inet_ipcomp);
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SYSCTL_INT(_net_inet_ipcomp, OID_AUTO,
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ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, "");
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SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
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stats, CTLFLAG_RD, &ipcompstat, ipcompstat, "");
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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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struct comp_algo *
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ipcomp_algorithm_lookup(int alg)
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{
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if (alg >= IPCOMP_ALG_MAX)
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return NULL;
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switch (alg) {
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case SADB_X_CALG_DEFLATE:
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return &comp_algo_deflate;
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}
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return NULL;
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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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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 = ipcomp_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, 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 tdb_crypto *tc;
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struct cryptodesc *crdc;
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struct cryptop *crp;
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int hlen = IPCOMP_HLENGTH;
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IPSEC_SPLASSERT_SOFTNET(__func__);
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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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m_freem(m);
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DPRINTF(("%s: no crypto descriptors\n", __func__));
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ipcompstat.ipcomps_crypto++;
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return ENOBUFS;
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}
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/* Get IPsec-specific opaque pointer */
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tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
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if (tc == NULL) {
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m_freem(m);
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crypto_freereq(crp);
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DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__));
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ipcompstat.ipcomps_crypto++;
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return ENOBUFS;
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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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tc->tc_ptr = 0;
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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_sid = sav->tdb_cryptoid;
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crp->crp_opaque = (caddr_t) tc;
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/* These are passed as-is to the callback */
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tc->tc_spi = sav->spi;
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tc->tc_dst = sav->sah->saidx.dst;
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tc->tc_proto = sav->sah->saidx.proto;
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tc->tc_protoff = protoff;
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tc->tc_skip = skip;
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return crypto_dispatch(crp);
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}
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#ifdef INET6
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#define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \
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if (saidx->dst.sa.sa_family == AF_INET6) { \
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error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
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} else { \
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error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
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} \
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} while (0)
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#else
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#define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \
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(error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
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#endif
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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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struct cryptodesc *crd;
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struct tdb_crypto *tc;
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int skip, protoff;
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struct mtag *mtag;
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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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int hlen = IPCOMP_HLENGTH, error, clen;
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u_int8_t nproto;
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caddr_t addr;
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crd = crp->crp_desc;
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tc = (struct tdb_crypto *) crp->crp_opaque;
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IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
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skip = tc->tc_skip;
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protoff = tc->tc_protoff;
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mtag = (struct mtag *) tc->tc_ptr;
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m = (struct mbuf *) crp->crp_buf;
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sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
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if (sav == NULL) {
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ipcompstat.ipcomps_notdb++;
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DPRINTF(("%s: SA expired while in crypto\n", __func__));
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error = ENOBUFS; /*XXX*/
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goto bad;
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}
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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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/* Reset the session ID */
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if (sav->tdb_cryptoid != 0)
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sav->tdb_cryptoid = crp->crp_sid;
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if (crp->crp_etype == EAGAIN) {
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KEY_FREESAV(&sav);
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return crypto_dispatch(crp);
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}
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ipcompstat.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.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.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(tc, M_XDATA), tc = 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)) == 0) {
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ipcompstat.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.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),
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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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IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
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KEY_FREESAV(&sav);
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return error;
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bad:
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if (sav)
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KEY_FREESAV(&sav);
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if (m)
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m_freem(m);
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if (tc != NULL)
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free(tc, M_XDATA);
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if (crp)
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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]_process_packet()
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*/
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static int
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ipcomp_output(
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struct mbuf *m,
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struct ipsecrequest *isr,
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struct mbuf **mp,
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int skip,
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int protoff
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)
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{
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struct secasvar *sav;
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struct comp_algo *ipcompx;
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int error, ralen, hlen, maxpacketsize, roff;
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u_int8_t prot;
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struct cryptodesc *crdc;
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struct cryptop *crp;
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struct tdb_crypto *tc;
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struct mbuf *mo;
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struct ipcomp *ipcomp;
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IPSEC_SPLASSERT_SOFTNET(__func__);
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sav = isr->sav;
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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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ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
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hlen = IPCOMP_HLENGTH;
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ipcompstat.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.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),
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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 (skip + hlen + ralen > maxpacketsize) {
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ipcompstat.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),
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(u_long) ntohl(sav->spi),
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skip + hlen + ralen, maxpacketsize));
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error = EMSGSIZE;
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goto bad;
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}
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/* Update the counters */
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ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
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m = m_clone(m);
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if (m == NULL) {
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ipcompstat.ipcomps_hdrops++;
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DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
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__func__, ipsec_address(&sav->sah->saidx.dst),
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(u_long) ntohl(sav->spi)));
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error = ENOBUFS;
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goto bad;
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}
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/* Inject IPCOMP header */
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mo = m_makespace(m, skip, hlen, &roff);
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if (mo == NULL) {
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ipcompstat.ipcomps_wrap++;
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DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n",
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__func__, ipsec_address(&sav->sah->saidx.dst),
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(u_long) ntohl(sav->spi)));
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error = ENOBUFS;
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goto bad;
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}
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ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
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/* Initialize the IPCOMP header */
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/* XXX alignment always correct? */
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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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ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
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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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ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
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break;
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#endif
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}
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ipcomp->comp_flags = 0;
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ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
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/* Fix Next Protocol in IPv4/IPv6 header */
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prot = IPPROTO_IPCOMP;
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m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
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/* Ok now, we can pass to the crypto processing */
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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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ipcompstat.ipcomps_crypto++;
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DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
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error = ENOBUFS;
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goto bad;
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}
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crdc = crp->crp_desc;
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/* Compression descriptor */
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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_flags = CRD_F_COMP;
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crdc->crd_inject = skip + hlen;
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/* Compression operation */
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crdc->crd_alg = ipcompx->type;
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/* IPsec-specific opaque crypto info */
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tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
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M_XDATA, M_NOWAIT|M_ZERO);
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if (tc == NULL) {
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ipcompstat.ipcomps_crypto++;
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DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
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crypto_freereq(crp);
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error = ENOBUFS;
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goto bad;
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}
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tc->tc_isr = isr;
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tc->tc_spi = sav->spi;
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tc->tc_dst = sav->sah->saidx.dst;
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tc->tc_proto = sav->sah->saidx.proto;
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tc->tc_skip = skip + hlen;
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/* Crypto operation descriptor */
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crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
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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_output_cb;
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crp->crp_opaque = (caddr_t) tc;
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crp->crp_sid = sav->tdb_cryptoid;
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return crypto_dispatch(crp);
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bad:
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if (m)
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m_freem(m);
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return (error);
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}
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/*
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* IPComp output callback from the crypto driver.
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*/
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static int
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ipcomp_output_cb(struct cryptop *crp)
|
|
{
|
|
struct tdb_crypto *tc;
|
|
struct ipsecrequest *isr;
|
|
struct secasvar *sav;
|
|
struct mbuf *m;
|
|
int error, skip, rlen;
|
|
|
|
tc = (struct tdb_crypto *) crp->crp_opaque;
|
|
IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
|
|
m = (struct mbuf *) crp->crp_buf;
|
|
skip = tc->tc_skip;
|
|
rlen = crp->crp_ilen - skip;
|
|
|
|
isr = tc->tc_isr;
|
|
IPSECREQUEST_LOCK(isr);
|
|
sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
|
|
if (sav == NULL) {
|
|
ipcompstat.ipcomps_notdb++;
|
|
DPRINTF(("%s: SA expired while in crypto\n", __func__));
|
|
error = ENOBUFS; /*XXX*/
|
|
goto bad;
|
|
}
|
|
IPSEC_ASSERT(isr->sav == sav, ("SA changed\n"));
|
|
|
|
/* Check for crypto errors */
|
|
if (crp->crp_etype) {
|
|
/* Reset session ID */
|
|
if (sav->tdb_cryptoid != 0)
|
|
sav->tdb_cryptoid = crp->crp_sid;
|
|
|
|
if (crp->crp_etype == EAGAIN) {
|
|
KEY_FREESAV(&sav);
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
return crypto_dispatch(crp);
|
|
}
|
|
ipcompstat.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.ipcomps_crypto++;
|
|
DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
ipcompstat.ipcomps_hist[sav->alg_comp]++;
|
|
|
|
if (rlen > crp->crp_olen) {
|
|
/* 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.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),
|
|
(u_long) ntohl(sav->spi)));
|
|
error = EPFNOSUPPORT;
|
|
goto bad;
|
|
}
|
|
} else {
|
|
/* compression was useless, we have lost time */
|
|
/* XXX add statistic */
|
|
}
|
|
|
|
/* Release the crypto descriptor */
|
|
free(tc, M_XDATA);
|
|
crypto_freereq(crp);
|
|
|
|
/* NB: m is reclaimed by ipsec_process_done. */
|
|
error = ipsec_process_done(m, isr);
|
|
KEY_FREESAV(&sav);
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
|
|
return error;
|
|
bad:
|
|
if (sav)
|
|
KEY_FREESAV(&sav);
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
if (m)
|
|
m_freem(m);
|
|
free(tc, M_XDATA);
|
|
crypto_freereq(crp);
|
|
return error;
|
|
}
|
|
|
|
static struct xformsw ipcomp_xformsw = {
|
|
XF_IPCOMP, XFT_COMP, "IPcomp",
|
|
ipcomp_init, ipcomp_zeroize, ipcomp_input,
|
|
ipcomp_output
|
|
};
|
|
|
|
static void
|
|
ipcomp_attach(void)
|
|
{
|
|
xform_register(&ipcomp_xformsw);
|
|
}
|
|
SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);
|