+++ /dev/null
-/*
- * Copyright (c) 2016 Apple Inc. All rights reserved.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
- *
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
- */
-
-/* $FreeBSD: src/sys/netinet6/ipcomp_output.c,v 1.1.2.2 2001/07/03 11:01:54 ume Exp $ */
-/* $KAME: ipcomp_output.c,v 1.23 2001/01/23 08:59:37 itojun Exp $ */
-
-/*
- * Copyright (C) 1999 WIDE Project.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the project nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-/*
- * RFC2393 IP payload compression protocol (IPComp).
- */
-
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/malloc.h>
-#include <sys/mbuf.h>
-#include <sys/domain.h>
-#include <sys/protosw.h>
-#include <sys/socket.h>
-#include <sys/errno.h>
-#include <sys/time.h>
-#include <sys/kernel.h>
-#include <sys/syslog.h>
-
-#include <net/if.h>
-#include <net/route.h>
-#include <libkern/zlib.h>
-#include <kern/cpu_number.h>
-#include <kern/locks.h>
-
-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/in_var.h>
-#include <netinet/ip.h>
-#include <netinet/ip_var.h>
-#include <netinet/ip_ecn.h>
-
-#if INET6
-#include <netinet/ip6.h>
-#include <netinet6/ip6_var.h>
-#endif
-#include <netinet6/ipcomp.h>
-#if INET6
-#include <netinet6/ipcomp6.h>
-#endif
-
-#include <netinet6/ipsec.h>
-#if INET6
-#include <netinet6/ipsec6.h>
-#endif
-#include <netkey/key.h>
-#include <netkey/keydb.h>
-
-#include <net/net_osdep.h>
-
-
-static int ipcomp_output(struct mbuf *, u_char *, struct mbuf *,
- int, struct secasvar *sav);
-
-/*
- * Modify the packet so that the payload is compressed.
- * The mbuf (m) must start with IPv4 or IPv6 header.
- * On failure, free the given mbuf and return non-zero.
- *
- * on invocation:
- * m nexthdrp md
- * v v v
- * IP ......... payload
- * during the encryption:
- * m nexthdrp mprev md
- * v v v v
- * IP ............... ipcomp payload
- * <-----><----->
- * complen plen
- * <-> hlen
- * <-----------------> compoff
- */
-static int
-ipcomp_output(struct mbuf *m, u_char *nexthdrp, struct mbuf *md, int af, struct secasvar *sav)
-{
- struct mbuf *n;
- struct mbuf *md0;
- struct mbuf *mcopy;
- struct mbuf *mprev;
- struct ipcomp *ipcomp;
- const struct ipcomp_algorithm *algo;
- u_int16_t cpi; /* host order */
- size_t plen0, plen; /*payload length to be compressed*/
- size_t compoff;
- int afnumber;
- int error = 0;
- struct ipsecstat *stat;
-
- switch (af) {
-#if INET
- case AF_INET:
- afnumber = 4;
- stat = &ipsecstat;
- break;
-#endif
-#if INET6
- case AF_INET6:
- afnumber = 6;
- stat = &ipsec6stat;
- break;
-#endif
- default:
- ipseclog((LOG_ERR, "ipcomp_output: unsupported af %d\n", af));
- return 0; /* no change at all */
- }
-
- /* grab parameters */
- algo = ipcomp_algorithm_lookup(sav->alg_enc);
- if ((ntohl(sav->spi) & ~0xffff) != 0 || !algo) {
- IPSEC_STAT_INCREMENT(stat->out_inval);
- m_freem(m);
- return EINVAL;
- }
- if ((sav->flags & SADB_X_EXT_RAWCPI) == 0) {
- cpi = sav->alg_enc;
- } else {
- cpi = ntohl(sav->spi) & 0xffff;
- }
-
- /* compute original payload length */
- plen = 0;
- for (n = md; n; n = n->m_next) {
- plen += n->m_len;
- }
-
- /* if the payload is short enough, we don't need to compress */
- if (plen < algo->minplen) {
- return 0;
- }
-
- /*
- * retain the original packet for two purposes:
- * (1) we need to backout our changes when compression is not necessary.
- * (2) byte lifetime computation should use the original packet.
- * see RFC2401 page 23.
- * compromise two m_copym(). we will be going through every byte of
- * the payload during compression process anyways.
- */
- mcopy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
- if (mcopy == NULL) {
- error = ENOBUFS;
- return 0;
- }
- md0 = m_copym(md, 0, M_COPYALL, M_NOWAIT);
- if (md0 == NULL) {
- m_freem(mcopy);
- error = ENOBUFS;
- return 0;
- }
- plen0 = plen;
-
- /* make the packet over-writable */
- for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next) {
- ;
- }
- if (mprev == NULL || mprev->m_next != md) {
- ipseclog((LOG_DEBUG, "ipcomp%d_output: md is not in chain\n",
- afnumber));
- IPSEC_STAT_INCREMENT(stat->out_inval);
- m_freem(m);
- m_freem(md0);
- m_freem(mcopy);
- return EINVAL;
- }
- mprev->m_next = NULL;
- if ((md = ipsec_copypkt(md)) == NULL) {
- m_freem(m);
- m_freem(md0);
- m_freem(mcopy);
- error = ENOBUFS;
- goto fail;
- }
- mprev->m_next = md;
-
- /* compress data part */
- if ((*algo->compress)(m, md, &plen) || mprev->m_next == NULL) {
- ipseclog((LOG_ERR, "packet compression failure\n"));
- m = NULL;
- m_freem(md0);
- m_freem(mcopy);
- IPSEC_STAT_INCREMENT(stat->out_inval);
- error = EINVAL;
- goto fail;
- }
- IPSEC_STAT_INCREMENT(stat->out_comphist[sav->alg_enc]);
- md = mprev->m_next;
-
- /*
- * if the packet became bigger, meaningless to use IPComp.
- * we've only wasted our cpu time.
- */
- if (plen0 < plen) {
- m_freem(md);
- m_freem(mcopy);
- mprev->m_next = md0;
- return 0;
- }
-
- /*
- * no need to backout change beyond here.
- */
- m_freem(md0);
- md0 = NULL;
-
- m->m_pkthdr.len -= plen0;
- m->m_pkthdr.len += plen;
-
- {
- /*
- * insert IPComp header.
- */
-#if INET
- struct ip *ip = NULL;
-#endif
-#if INET6
- struct ip6_hdr *ip6 = NULL;
-#endif
- size_t hlen = 0; /*ip header len*/
- size_t complen = sizeof(struct ipcomp);
-
- switch (af) {
-#if INET
- case AF_INET:
- ip = mtod(m, struct ip *);
-#ifdef _IP_VHL
- hlen = IP_VHL_HL(ip->ip_vhl) << 2;
-#else
- hlen = ip->ip_hl << 2;
-#endif
- break;
-#endif
-#if INET6
- case AF_INET6:
- ip6 = mtod(m, struct ip6_hdr *);
- hlen = sizeof(*ip6);
- break;
-#endif
- }
-
- compoff = m->m_pkthdr.len - plen;
-
- /*
- * grow the mbuf to accomodate ipcomp header.
- * before: IP ... payload
- * after: IP ... ipcomp payload
- */
- if (M_LEADINGSPACE(md) < complen) {
- MGET(n, M_DONTWAIT, MT_DATA);
- if (!n) {
- m_freem(m);
- error = ENOBUFS;
- goto fail;
- }
- n->m_len = complen;
- mprev->m_next = n;
- n->m_next = md;
- m->m_pkthdr.len += complen;
- ipcomp = mtod(n, struct ipcomp *);
- } else {
- md->m_len += complen;
- md->m_data -= complen;
- m->m_pkthdr.len += complen;
- ipcomp = mtod(md, struct ipcomp *);
- }
-
- bzero(ipcomp, sizeof(*ipcomp));
- ipcomp->comp_nxt = *nexthdrp;
- *nexthdrp = IPPROTO_IPCOMP;
- ipcomp->comp_cpi = htons(cpi);
- switch (af) {
-#if INET
- case AF_INET:
- if (compoff + complen + plen < IP_MAXPACKET) {
- ip->ip_len = htons(compoff + complen + plen);
- } else {
- ipseclog((LOG_ERR,
- "IPv4 ESP output: size exceeds limit\n"));
- IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
- m_freem(m);
- error = EMSGSIZE;
- goto fail;
- }
- break;
-#endif
-#if INET6
- case AF_INET6:
- /* total packet length will be computed in ip6_output() */
- break;
-#endif
- }
- }
-
- if (!m) {
- ipseclog((LOG_DEBUG,
- "NULL mbuf after compression in ipcomp%d_output",
- afnumber));
- IPSEC_STAT_INCREMENT(stat->out_inval);
- }
- IPSEC_STAT_INCREMENT(stat->out_success);
-
- /* compute byte lifetime against original packet */
- key_sa_recordxfer(sav, mcopy);
- m_freem(mcopy);
-
- return 0;
-
-fail:
-#if 1
- return error;
-#else
- panic("something bad in ipcomp_output");
-#endif
-}
-
-#if INET
-int
-ipcomp4_output(struct mbuf *m, struct secasvar *sav)
-{
- struct ip *ip;
- if (m->m_len < sizeof(struct ip)) {
- ipseclog((LOG_DEBUG, "ipcomp4_output: first mbuf too short\n"));
- IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
- m_freem(m);
- return 0;
- }
- ip = mtod(m, struct ip *);
- /* XXX assumes that m->m_next points to payload */
- return ipcomp_output(m, &ip->ip_p, m->m_next, AF_INET, sav);
-}
-#endif /*INET*/
-
-#if INET6
-int
-ipcomp6_output(
- struct mbuf *m,
- u_char *nexthdrp,
- struct mbuf *md,
- struct secasvar *sav)
-{
- if (m->m_len < sizeof(struct ip6_hdr)) {
- ipseclog((LOG_DEBUG, "ipcomp6_output: first mbuf too short\n"));
- IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
- m_freem(m);
- return 0;
- }
- return ipcomp_output(m, nexthdrp, md, AF_INET6, sav);
-}
-#endif /*INET6*/
projects / apple / xnu.git / blobdiff