+++ /dev/null
-/* $KAME: ipcomp_core.c,v 1.10 2000/02/22 14:04:23 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).
- */
-
-#define _IP_VHL
-#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
-#include "opt_inet.h"
-#endif
-
-#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 <sys/queue.h>
-
-#include <net/if.h>
-#include <net/route.h>
-#include <net/netisr.h>
-#include <net/zlib.h>
-#include <kern/cpu_number.h>
-
-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet6/ipcomp.h>
-#include <netinet6/ipsec.h>
-
-#include <net/net_osdep.h>
-
-static void *deflate_alloc __P((void *, u_int, u_int));
-static void deflate_free __P((void *, void *));
-static int deflate_common __P((struct mbuf *, struct mbuf *, size_t *, int));
-static int deflate_compress __P((struct mbuf *, struct mbuf *, size_t *));
-static int deflate_decompress __P((struct mbuf *, struct mbuf *, size_t *));
-
-/*
- * We need to use default window size (2^15 = 32Kbytes as of writing) for
- * inbound case. Otherwise we get interop problem.
- * Use negative value to avoid Adler32 checksum. This is an undocumented
- * feature in zlib (see ipsec wg mailing list archive in January 2000).
- */
-static int deflate_policy = Z_DEFAULT_COMPRESSION;
-static int deflate_window_out = -12;
-static const int deflate_window_in = -1 * MAX_WBITS; /* don't change it */
-static int deflate_memlevel = MAX_MEM_LEVEL;
-
-struct ipcomp_algorithm ipcomp_algorithms[] = {
- { NULL, NULL, -1 },
- { NULL, NULL, -1 },
- { deflate_compress, deflate_decompress, 90 },
- { NULL, NULL, 90 },
-};
-
-static void *
-deflate_alloc(aux, items, siz)
- void *aux;
- u_int items;
- u_int siz;
-{
- void *ptr;
- MALLOC(ptr, void *, items * siz, M_TEMP, M_NOWAIT);
- return ptr;
-}
-
-static void
-deflate_free(aux, ptr)
- void *aux;
- void *ptr;
-{
- FREE(ptr, M_TEMP);
-}
-
-static int
-deflate_common(m, md, lenp, mode)
- struct mbuf *m;
- struct mbuf *md;
- size_t *lenp;
- int mode; /* 0: compress 1: decompress */
-{
- struct mbuf *mprev;
- struct mbuf *p;
- struct mbuf *n, *n0 = NULL, **np;
- z_stream zs;
- int error = 0;
- int zerror;
- size_t offset;
- int firsttime, final, flush;
-
- for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
- ;
- if (!mprev)
- panic("md is not in m in deflate_common");
-
- bzero(&zs, sizeof(zs));
- zs.zalloc = deflate_alloc;
- zs.zfree = deflate_free;
-
- zerror = mode ? inflateInit2(&zs, deflate_window_in)
- : deflateInit2(&zs, deflate_policy, Z_DEFLATED,
- deflate_window_out, deflate_memlevel,
- Z_DEFAULT_STRATEGY);
- if (zerror != Z_OK) {
- error = ENOBUFS;
- goto fail;
- }
-
- n0 = n = NULL;
- np = &n0;
- offset = 0;
- firsttime = 1;
- final = 0;
- flush = Z_NO_FLUSH;
- zerror = 0;
- p = md;
- while (1) {
- /*
- * first time, we need to setup the buffer before calling
- * compression function.
- */
- if (firsttime)
- firsttime = 0;
- else {
- zerror = mode ? inflate(&zs, flush)
- : deflate(&zs, flush);
- }
-
- /* get input buffer */
- if (p && zs.avail_in == 0) {
- zs.next_in = mtod(p, u_int8_t *);
- zs.avail_in = p->m_len;
- p = p->m_next;
- if (!p) {
- final = 1;
- flush = Z_PARTIAL_FLUSH;
- }
- }
-
- /* get output buffer */
- if (zs.next_out == NULL || zs.avail_out == 0) {
- /* keep the reply buffer into our chain */
- if (n) {
- n->m_len = zs.total_out - offset;
- offset = zs.total_out;
- *np = n;
- np = &n->m_next;
- }
-
- /* get a fresh reply buffer */
- MGET(n, M_DONTWAIT, MT_DATA);
- if (n) {
- MCLGET(n, M_DONTWAIT);
- }
- if (!n) {
- error = ENOBUFS;
- goto fail;
- }
- n->m_len = 0;
- n->m_len = M_TRAILINGSPACE(n);
- n->m_next = NULL;
- /*
- * if this is the first reply buffer, reserve
- * region for ipcomp header.
- */
- if (*np == NULL) {
- n->m_len -= sizeof(struct ipcomp);
- n->m_data += sizeof(struct ipcomp);
- }
-
- zs.next_out = mtod(n, u_int8_t *);
- zs.avail_out = n->m_len;
- }
-
- if (zerror == Z_OK) {
- /*
- * to terminate deflate/inflate process, we need to
- * call {in,de}flate() with different flushing methods.
- *
- * deflate() needs at least one Z_PARTIAL_FLUSH,
- * then use Z_FINISH until we get to the end.
- * (if we use Z_FLUSH without Z_PARTIAL_FLUSH, deflate()
- * will assume contiguous single output buffer, and that
- * is not what we want)
- * inflate() does not care about flushing method, but
- * needs output buffer until it gets to the end.
- *
- * the most outer loop will be terminated with
- * Z_STREAM_END.
- */
- if (final == 1) {
- /* reached end of mbuf chain */
- if (mode == 0)
- final = 2;
- else
- final = 3;
- } else if (final == 2) {
- /* terminate deflate case */
- flush = Z_FINISH;
- } else if (final == 3) {
- /* terminate inflate case */
- ;
- }
- } else if (zerror == Z_STREAM_END)
- break;
- else {
- ipseclog((LOG_ERR, "ipcomp_%scompress: %sflate: %s\n",
- mode ? "de" : "", mode ? "in" : "de",
- zs.msg ? zs.msg : "unknown error"));
- error = EINVAL;
- goto fail;
- }
- }
- zerror = mode ? inflateEnd(&zs) : deflateEnd(&zs);
- if (zerror != Z_OK) {
- ipseclog((LOG_ERR, "ipcomp_%scompress: %sflate: %s\n",
- mode ? "de" : "", mode ? "in" : "de",
- zs.msg ? zs.msg : "unknown error"));
- error = EINVAL;
- goto fail;
- }
- /* keep the final reply buffer into our chain */
- if (n) {
- n->m_len = zs.total_out - offset;
- offset = zs.total_out;
- *np = n;
- np = &n->m_next;
- }
-
- /* switch the mbuf to the new one */
- mprev->m_next = n0;
- m_freem(md);
- *lenp = zs.total_out;
-
- return 0;
-
-fail:
- if (m)
- m_freem(m);
- if (n0)
- m_freem(n0);
- return error;
-}
-
-static int
-deflate_compress(m, md, lenp)
- struct mbuf *m;
- struct mbuf *md;
- size_t *lenp;
-{
- if (!m)
- panic("m == NULL in deflate_compress");
- if (!md)
- panic("md == NULL in deflate_compress");
- if (!lenp)
- panic("lenp == NULL in deflate_compress");
-
- return deflate_common(m, md, lenp, 0);
-}
-
-static int
-deflate_decompress(m, md, lenp)
- struct mbuf *m;
- struct mbuf *md;
- size_t *lenp;
-{
- if (!m)
- panic("m == NULL in deflate_decompress");
- if (!md)
- panic("md == NULL in deflate_decompress");
- if (!lenp)
- panic("lenp == NULL in deflate_decompress");
-
- return deflate_common(m, md, lenp, 1);
-}
projects / apple / xnu.git / blobdiff