2 /* $KAME: ipcomp_core.c,v 1.25 2001/07/26 06:53:17 jinmei Exp $ */
5 * Copyright (C) 1999 WIDE Project.
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20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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34 * RFC2393 IP payload compression protocol (IPComp).
38 #include "opt_inet6.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/malloc.h>
44 #include <sys/domain.h>
45 #include <sys/protosw.h>
46 #include <sys/socket.h>
47 #include <sys/errno.h>
49 #include <sys/syslog.h>
50 #include <sys/queue.h>
53 #include <net/route.h>
54 #include <net/netisr.h>
56 #include <machine/cpu.h>
58 #include <netinet6/ipcomp.h>
60 #include <netinet6/ipcomp6.h>
62 #include <netinet6/ipsec.h>
64 #include <netinet6/ipsec6.h>
67 #include <machine/stdarg.h>
69 #include <net/net_osdep.h>
71 static void *deflate_alloc __P((void *, u_int, u_int));
72 static void deflate_free __P((void *, void *));
73 static int deflate_common __P((struct mbuf *, struct mbuf *, size_t *, int));
74 static int deflate_compress __P((struct mbuf *, struct mbuf *, size_t *));
75 static int deflate_decompress __P((struct mbuf *, struct mbuf *, size_t *));
78 * We need to use default window size (2^15 = 32Kbytes as of writing) for
79 * inbound case. Otherwise we get interop problem.
80 * Use negative value to avoid Adler32 checksum. This is an undocumented
81 * feature in zlib (see ipsec wg mailing list archive in January 2000).
83 static int deflate_policy = Z_DEFAULT_COMPRESSION;
84 static int deflate_window_out = -12;
85 static const int deflate_window_in = -1 * MAX_WBITS; /* don't change it */
86 static int deflate_memlevel = MAX_MEM_LEVEL;
88 static const struct ipcomp_algorithm ipcomp_algorithms[] = {
89 { deflate_compress, deflate_decompress, 90 },
92 const struct ipcomp_algorithm *
93 ipcomp_algorithm_lookup(idx)
97 if (idx == SADB_X_CALG_DEFLATE)
98 return &ipcomp_algorithms[0];
103 deflate_alloc(aux, items, siz)
109 ptr = malloc(items * siz, M_TEMP, M_NOWAIT);
114 deflate_free(aux, ptr)
122 deflate_common(m, md, lenp, mode)
126 int mode; /* 0: compress 1: decompress */
130 struct mbuf *n = NULL, *n0 = NULL, **np;
136 #define MOREBLOCK() \
138 /* keep the reply buffer into our chain */ \
140 n->m_len = zs.total_out - offset; \
141 offset = zs.total_out; \
147 /* get a fresh reply buffer */ \
148 MGET(n, M_DONTWAIT, MT_DATA); \
150 MCLGET(n, M_DONTWAIT); \
157 n->m_len = M_TRAILINGSPACE(n); \
160 * if this is the first reply buffer, reserve \
161 * region for ipcomp header. \
164 n->m_len -= sizeof(struct ipcomp); \
165 n->m_data += sizeof(struct ipcomp); \
168 zs.next_out = mtod(n, u_int8_t *); \
169 zs.avail_out = n->m_len; \
172 for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
175 panic("md is not in m in deflate_common");
177 bzero(&zs, sizeof(zs));
178 zs.zalloc = deflate_alloc;
179 zs.zfree = deflate_free;
181 zerror = mode ? inflateInit2(&zs, deflate_window_in)
182 : deflateInit2(&zs, deflate_policy, Z_DEFLATED,
183 deflate_window_out, deflate_memlevel,
185 if (zerror != Z_OK) {
195 while (p && p->m_len == 0) {
199 /* input stream and output stream are available */
200 while (p && zs.avail_in == 0) {
201 /* get input buffer */
202 if (p && zs.avail_in == 0) {
203 zs.next_in = mtod(p, u_int8_t *);
204 zs.avail_in = p->m_len;
206 while (p && p->m_len == 0) {
211 /* get output buffer */
212 if (zs.next_out == NULL || zs.avail_out == 0) {
216 zerror = mode ? inflate(&zs, Z_NO_FLUSH)
217 : deflate(&zs, Z_NO_FLUSH);
219 if (zerror == Z_STREAM_END)
221 else if (zerror == Z_OK) {
222 /* inflate: Z_OK can indicate the end of decode */
223 if (mode && !p && zs.avail_out != 0)
229 ipseclog((LOG_ERR, "ipcomp_%scompress: "
230 "%sflate(Z_NO_FLUSH): %s\n",
231 mode ? "de" : "", mode ? "in" : "de",
234 ipseclog((LOG_ERR, "ipcomp_%scompress: "
235 "%sflate(Z_NO_FLUSH): unknown error (%d)\n",
236 mode ? "de" : "", mode ? "in" : "de",
239 mode ? inflateEnd(&zs) : deflateEnd(&zs);
245 if (zerror == Z_STREAM_END)
250 /* get output buffer */
251 if (zs.next_out == NULL || zs.avail_out == 0) {
255 zerror = mode ? inflate(&zs, Z_SYNC_FLUSH)
256 : deflate(&zs, Z_FINISH);
258 if (zerror == Z_STREAM_END)
260 else if (zerror == Z_OK) {
261 if (mode && zs.avail_out != 0)
267 ipseclog((LOG_ERR, "ipcomp_%scompress: "
268 "%sflate(Z_FINISH): %s\n",
269 mode ? "de" : "", mode ? "in" : "de",
272 ipseclog((LOG_ERR, "ipcomp_%scompress: "
273 "%sflate(Z_FINISH): unknown error (%d)\n",
274 mode ? "de" : "", mode ? "in" : "de",
277 mode ? inflateEnd(&zs) : deflateEnd(&zs);
284 zerror = mode ? inflateEnd(&zs) : deflateEnd(&zs);
285 if (zerror != Z_OK) {
287 ipseclog((LOG_ERR, "ipcomp_%scompress: "
289 mode ? "de" : "", mode ? "in" : "de",
292 ipseclog((LOG_ERR, "ipcomp_%scompress: "
293 "%sflateEnd: unknown error (%d)\n",
294 mode ? "de" : "", mode ? "in" : "de",
300 /* keep the final reply buffer into our chain */
302 n->m_len = zs.total_out - offset;
303 offset = zs.total_out;
309 /* switch the mbuf to the new one */
312 *lenp = zs.total_out;
328 deflate_compress(m, md, lenp)
334 panic("m == NULL in deflate_compress");
336 panic("md == NULL in deflate_compress");
338 panic("lenp == NULL in deflate_compress");
340 return deflate_common(m, md, lenp, 0);
344 deflate_decompress(m, md, lenp)
350 panic("m == NULL in deflate_decompress");
352 panic("md == NULL in deflate_decompress");
354 panic("lenp == NULL in deflate_decompress");
356 return deflate_common(m, md, lenp, 1);