The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ipcomp_core.c

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    1 /*      $FreeBSD: releng/5.0/sys/netinet6/ipcomp_core.c 96457 2002-05-12 14:12:30Z ume $        */
    2 /*      $KAME: ipcomp_core.c,v 1.25 2001/07/26 06:53:17 jinmei Exp $    */
    3 
    4 /*
    5  * Copyright (C) 1999 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   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
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * RFC2393 IP payload compression protocol (IPComp).
   35  */
   36 
   37 #include "opt_inet.h"
   38 #include "opt_inet6.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/domain.h>
   45 #include <sys/protosw.h>
   46 #include <sys/socket.h>
   47 #include <sys/errno.h>
   48 #include <sys/time.h>
   49 #include <sys/syslog.h>
   50 #include <sys/queue.h>
   51 
   52 #include <net/if.h>
   53 #include <net/route.h>
   54 #include <net/netisr.h>
   55 #include <net/zlib.h>
   56 #include <machine/cpu.h>
   57 
   58 #include <netinet6/ipcomp.h>
   59 #ifdef INET6
   60 #include <netinet6/ipcomp6.h>
   61 #endif
   62 #include <netinet6/ipsec.h>
   63 #ifdef INET6
   64 #include <netinet6/ipsec6.h>
   65 #endif
   66 
   67 #include <machine/stdarg.h>
   68 
   69 #include <net/net_osdep.h>
   70 
   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 *));
   76 
   77 /*
   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).
   82  */
   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;
   87 
   88 static const struct ipcomp_algorithm ipcomp_algorithms[] = {
   89         { deflate_compress, deflate_decompress, 90 },
   90 };
   91 
   92 const struct ipcomp_algorithm *
   93 ipcomp_algorithm_lookup(idx)
   94         int idx;
   95 {
   96 
   97         if (idx == SADB_X_CALG_DEFLATE)
   98                 return &ipcomp_algorithms[0];
   99         return NULL;
  100 }
  101 
  102 static void *
  103 deflate_alloc(aux, items, siz)
  104         void *aux;
  105         u_int items;
  106         u_int siz;
  107 {
  108         void *ptr;
  109         ptr = malloc(items * siz, M_TEMP, M_NOWAIT);
  110         return ptr;
  111 }
  112 
  113 static void
  114 deflate_free(aux, ptr)
  115         void *aux;
  116         void *ptr;
  117 {
  118         free(ptr, M_TEMP);
  119 }
  120 
  121 static int
  122 deflate_common(m, md, lenp, mode)
  123         struct mbuf *m;
  124         struct mbuf *md;
  125         size_t *lenp;
  126         int mode;       /* 0: compress 1: decompress */
  127 {
  128         struct mbuf *mprev;
  129         struct mbuf *p;
  130         struct mbuf *n = NULL, *n0 = NULL, **np;
  131         z_stream zs;
  132         int error = 0;
  133         int zerror;
  134         size_t offset;
  135 
  136 #define MOREBLOCK() \
  137 do { \
  138         /* keep the reply buffer into our chain */              \
  139         if (n) {                                                \
  140                 n->m_len = zs.total_out - offset;               \
  141                 offset = zs.total_out;                          \
  142                 *np = n;                                        \
  143                 np = &n->m_next;                                \
  144                 n = NULL;                                       \
  145         }                                                       \
  146                                                                 \
  147         /* get a fresh reply buffer */                          \
  148         MGET(n, M_DONTWAIT, MT_DATA);                           \
  149         if (n) {                                                \
  150                 MCLGET(n, M_DONTWAIT);                          \
  151         }                                                       \
  152         if (!n) {                                               \
  153                 error = ENOBUFS;                                \
  154                 goto fail;                                      \
  155         }                                                       \
  156         n->m_len = 0;                                           \
  157         n->m_len = M_TRAILINGSPACE(n);                          \
  158         n->m_next = NULL;                                       \
  159         /*                                                      \
  160          * if this is the first reply buffer, reserve           \
  161          * region for ipcomp header.                            \
  162          */                                                     \
  163         if (*np == NULL) {                                      \
  164                 n->m_len -= sizeof(struct ipcomp);              \
  165                 n->m_data += sizeof(struct ipcomp);             \
  166         }                                                       \
  167                                                                 \
  168         zs.next_out = mtod(n, u_int8_t *);                      \
  169         zs.avail_out = n->m_len;                                \
  170 } while (0)
  171 
  172         for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
  173                 ;
  174         if (!mprev)
  175                 panic("md is not in m in deflate_common");
  176 
  177         bzero(&zs, sizeof(zs));
  178         zs.zalloc = deflate_alloc;
  179         zs.zfree = deflate_free;
  180 
  181         zerror = mode ? inflateInit2(&zs, deflate_window_in)
  182                       : deflateInit2(&zs, deflate_policy, Z_DEFLATED,
  183                                 deflate_window_out, deflate_memlevel,
  184                                 Z_DEFAULT_STRATEGY);
  185         if (zerror != Z_OK) {
  186                 error = ENOBUFS;
  187                 goto fail;
  188         }
  189 
  190         n0 = n = NULL;
  191         np = &n0;
  192         offset = 0;
  193         zerror = 0;
  194         p = md;
  195         while (p && p->m_len == 0) {
  196                 p = p->m_next;
  197         }
  198 
  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;
  205                         p = p->m_next;
  206                         while (p && p->m_len == 0) {
  207                                 p = p->m_next;
  208                         }
  209                 }
  210 
  211                 /* get output buffer */
  212                 if (zs.next_out == NULL || zs.avail_out == 0) {
  213                         MOREBLOCK();
  214                 }
  215 
  216                 zerror = mode ? inflate(&zs, Z_NO_FLUSH)
  217                               : deflate(&zs, Z_NO_FLUSH);
  218 
  219                 if (zerror == Z_STREAM_END)
  220                         ; /* once more. */
  221                 else if (zerror == Z_OK) {
  222                         /* inflate: Z_OK can indicate the end of decode */
  223                         if (mode && !p && zs.avail_out != 0)
  224                                 goto terminate;
  225                         else
  226                                 ; /* once more. */
  227                 } else {
  228                         if (zs.msg) {
  229                                 ipseclog((LOG_ERR, "ipcomp_%scompress: "
  230                                     "%sflate(Z_NO_FLUSH): %s\n",
  231                                     mode ? "de" : "", mode ? "in" : "de",
  232                                     zs.msg));
  233                         } else {
  234                                 ipseclog((LOG_ERR, "ipcomp_%scompress: "
  235                                     "%sflate(Z_NO_FLUSH): unknown error (%d)\n",
  236                                     mode ? "de" : "", mode ? "in" : "de",
  237                                     zerror));
  238                         }
  239                         mode ? inflateEnd(&zs) : deflateEnd(&zs);
  240                         error = EINVAL;
  241                         goto fail;
  242                 }
  243         }
  244 
  245         if (zerror == Z_STREAM_END)
  246                 goto terminate;
  247 
  248         /* termination */
  249         while (1) {
  250                 /* get output buffer */
  251                 if (zs.next_out == NULL || zs.avail_out == 0) {
  252                         MOREBLOCK();
  253                 }
  254 
  255                 zerror = mode ? inflate(&zs, Z_SYNC_FLUSH)
  256                               : deflate(&zs, Z_FINISH);
  257 
  258                 if (zerror == Z_STREAM_END)
  259                         break;
  260                 else if (zerror == Z_OK) {
  261                         if (mode && zs.avail_out != 0)
  262                                 goto terminate;
  263                         else
  264                                 ; /* once more. */
  265                 } else {
  266                         if (zs.msg) {
  267                                 ipseclog((LOG_ERR, "ipcomp_%scompress: "
  268                                     "%sflate(Z_FINISH): %s\n",
  269                                     mode ? "de" : "", mode ? "in" : "de",
  270                                     zs.msg));
  271                         } else {
  272                                 ipseclog((LOG_ERR, "ipcomp_%scompress: "
  273                                     "%sflate(Z_FINISH): unknown error (%d)\n",
  274                                     mode ? "de" : "", mode ? "in" : "de",
  275                                     zerror));
  276                         }
  277                         mode ? inflateEnd(&zs) : deflateEnd(&zs);
  278                         error = EINVAL;
  279                         goto fail;
  280                 }
  281         }
  282 
  283 terminate:
  284         zerror = mode ? inflateEnd(&zs) : deflateEnd(&zs);
  285         if (zerror != Z_OK) {
  286                 if (zs.msg) {
  287                         ipseclog((LOG_ERR, "ipcomp_%scompress: "
  288                             "%sflateEnd: %s\n",
  289                             mode ? "de" : "", mode ? "in" : "de",
  290                             zs.msg));
  291                 } else {
  292                         ipseclog((LOG_ERR, "ipcomp_%scompress: "
  293                             "%sflateEnd: unknown error (%d)\n",
  294                             mode ? "de" : "", mode ? "in" : "de",
  295                             zerror));
  296                 }
  297                 error = EINVAL;
  298                 goto fail;
  299         }
  300         /* keep the final reply buffer into our chain */
  301         if (n) {
  302                 n->m_len = zs.total_out - offset;
  303                 offset = zs.total_out;
  304                 *np = n;
  305                 np = &n->m_next;
  306                 n = NULL;
  307         }
  308 
  309         /* switch the mbuf to the new one */
  310         mprev->m_next = n0;
  311         m_freem(md);
  312         *lenp = zs.total_out;
  313 
  314         return 0;
  315 
  316 fail:
  317         if (m)
  318                 m_freem(m);
  319         if (n)
  320                 m_freem(n);
  321         if (n0)
  322                 m_freem(n0);
  323         return error;
  324 #undef MOREBLOCK
  325 }
  326 
  327 static int
  328 deflate_compress(m, md, lenp)
  329         struct mbuf *m;
  330         struct mbuf *md;
  331         size_t *lenp;
  332 {
  333         if (!m)
  334                 panic("m == NULL in deflate_compress");
  335         if (!md)
  336                 panic("md == NULL in deflate_compress");
  337         if (!lenp)
  338                 panic("lenp == NULL in deflate_compress");
  339 
  340         return deflate_common(m, md, lenp, 0);
  341 }
  342 
  343 static int
  344 deflate_decompress(m, md, lenp)
  345         struct mbuf *m;
  346         struct mbuf *md;
  347         size_t *lenp;
  348 {
  349         if (!m)
  350                 panic("m == NULL in deflate_decompress");
  351         if (!md)
  352                 panic("md == NULL in deflate_decompress");
  353         if (!lenp)
  354                 panic("lenp == NULL in deflate_decompress");
  355 
  356         return deflate_common(m, md, lenp, 1);
  357 }

Cache object: 27e0e10e1e00a0892b9f782cc9942af4


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