sys/netgraph7/deflate/ng_deflate.c

   1 /*-
   2  * Copyright (c) 2006 Alexander Motin <mav@alkar.net>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/sys/netgraph/ng_deflate.c,v 1.3 2007/01/15 05:55:56 glebius Exp $
  28  */
  29
  30 /*
  31  * Deflate PPP compression netgraph node type.
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/mbuf.h>
  38 #include <sys/malloc.h>
  39 #include <sys/errno.h>
  40 #include <sys/syslog.h>
  41
  42 #include <net/zlib.h>
  43
  44 #include <netgraph7/ng_message.h>
  45 #include <netgraph7/netgraph.h>
  46 #include <netgraph7/ng_parse.h>
  47 #include "ng_deflate.h"
  48
  49 #include "opt_netgraph.h"
  50
  51 MALLOC_DEFINE(M_NETGRAPH_DEFLATE, "netgraph_deflate", "netgraph deflate node ");
  52
  53 /* DEFLATE header length */
  54 #define DEFLATE_HDRLEN          2
  55
  56 #define PROT_COMPD              0x00fd
  57
  58 #define DEFLATE_BUF_SIZE        4096
  59
  60 /* Node private data */
  61 struct ng_deflate_private {
  62         struct ng_deflate_config cfg;           /* configuration */
  63         u_char          inbuf[DEFLATE_BUF_SIZE];        /* input buffer */
  64         u_char          outbuf[DEFLATE_BUF_SIZE];       /* output buffer */
  65         z_stream        cx;                     /* compression context */
  66         struct ng_deflate_stats stats;          /* statistics */
  67         ng_ID_t         ctrlnode;               /* path to controlling node */
  68         uint16_t        seqnum;                 /* sequence number */
  69         u_char          compress;               /* compress/decompress flag */
  70 };
  71 typedef struct ng_deflate_private *priv_p;
  72
  73 /* Netgraph node methods */
  74 static ng_constructor_t ng_deflate_constructor;
  75 static ng_rcvmsg_t      ng_deflate_rcvmsg;
  76 static ng_shutdown_t    ng_deflate_shutdown;
  77 static ng_newhook_t     ng_deflate_newhook;
  78 static ng_rcvdata_t     ng_deflate_rcvdata;
  79 static ng_disconnect_t  ng_deflate_disconnect;
  80
  81 /* Helper functions */
  82 static void     *z_alloc(void *, u_int items, u_int size);
  83 static void     z_free(void *, void *ptr);
  84 static int      ng_deflate_compress(node_p node,
  85                     struct mbuf *m, struct mbuf **resultp);
  86 static int      ng_deflate_decompress(node_p node,
  87                     struct mbuf *m, struct mbuf **resultp);
  88 static void     ng_deflate_reset_req(node_p node);
  89
  90 /* Parse type for struct ng_deflate_config. */
  91 static const struct ng_parse_struct_field ng_deflate_config_type_fields[]
  92         = NG_DEFLATE_CONFIG_INFO;
  93 static const struct ng_parse_type ng_deflate_config_type = {
  94         &ng_parse_struct_type,
  95         ng_deflate_config_type_fields
  96 };
  97
  98 /* Parse type for struct ng_deflate_stat. */
  99 static const struct ng_parse_struct_field ng_deflate_stats_type_fields[]
 100         = NG_DEFLATE_STATS_INFO;
 101 static const struct ng_parse_type ng_deflate_stat_type = {
 102         &ng_parse_struct_type,
 103         ng_deflate_stats_type_fields
 104 };
 105
 106 /* List of commands and how to convert arguments to/from ASCII. */
 107 static const struct ng_cmdlist ng_deflate_cmds[] = {
 108         {
 109           NGM_DEFLATE_COOKIE,
 110           NGM_DEFLATE_CONFIG,
 111           "config",
 112           &ng_deflate_config_type,
 113           NULL
 114         },
 115         {
 116           NGM_DEFLATE_COOKIE,
 117           NGM_DEFLATE_RESETREQ,
 118           "resetreq",
 119           NULL,
 120           NULL
 121         },
 122         {
 123           NGM_DEFLATE_COOKIE,
 124           NGM_DEFLATE_GET_STATS,
 125           "getstats",
 126           NULL,
 127           &ng_deflate_stat_type
 128         },
 129         {
 130           NGM_DEFLATE_COOKIE,
 131           NGM_DEFLATE_CLR_STATS,
 132           "clrstats",
 133           NULL,
 134           NULL
 135         },
 136         {
 137           NGM_DEFLATE_COOKIE,
 138           NGM_DEFLATE_GETCLR_STATS,
 139           "getclrstats",
 140           NULL,
 141           &ng_deflate_stat_type
 142         },
 143         { 0 }
 144 };
 145
 146 /* Node type descriptor */
 147 static struct ng_type ng_deflate_typestruct = {
 148         .version =      NG_ABI_VERSION,
 149         .name =         NG_DEFLATE_NODE_TYPE,
 150         .constructor =  ng_deflate_constructor,
 151         .rcvmsg =       ng_deflate_rcvmsg,
 152         .shutdown =     ng_deflate_shutdown,
 153         .newhook =      ng_deflate_newhook,
 154         .rcvdata =      ng_deflate_rcvdata,
 155         .disconnect =   ng_deflate_disconnect,
 156         .cmdlist =      ng_deflate_cmds,
 157 };
 158 NETGRAPH_INIT(deflate, &ng_deflate_typestruct);
 159
 160 /* Depend on separate zlib module. */
 161 MODULE_DEPEND(ng_deflate, zlib, 1, 1, 1);
 162
 163 #define ERROUT(x)       do { error = (x); goto done; } while (0)
 164
 165 /************************************************************************
 166                         NETGRAPH NODE STUFF
 167  ************************************************************************/
 168
 169 /*
 170  * Node type constructor
 171  */
 172 static int
 173 ng_deflate_constructor(node_p node)
 174 {
 175         priv_p priv;
 176
 177         /* Allocate private structure. */
 178         priv = kmalloc(sizeof(*priv), M_NETGRAPH_DEFLATE, M_WAITOK | M_ZERO);
 179
 180         NG_NODE_SET_PRIVATE(node, priv);
 181
 182         /* This node is not thread safe. */
 183         NG_NODE_FORCE_WRITER(node);
 184
 185         /* Done */
 186         return (0);
 187 }
 188
 189 /*
 190  * Give our OK for a hook to be added.
 191  */
 192 static int
 193 ng_deflate_newhook(node_p node, hook_p hook, const char *name)
 194 {
 195         const priv_p priv = NG_NODE_PRIVATE(node);
 196
 197         if (NG_NODE_NUMHOOKS(node) > 0)
 198                 return (EINVAL);
 199
 200         if (strcmp(name, NG_DEFLATE_HOOK_COMP) == 0)
 201                 priv->compress = 1;
 202         else if (strcmp(name, NG_DEFLATE_HOOK_DECOMP) == 0)
 203                 priv->compress = 0;
 204         else
 205                 return (EINVAL);
 206
 207         return (0);
 208 }
 209
 210 /*
 211  * Receive a control message
 212  */
 213 static int
 214 ng_deflate_rcvmsg(node_p node, item_p item, hook_p lasthook)
 215 {
 216         const priv_p priv = NG_NODE_PRIVATE(node);
 217         struct ng_mesg *resp = NULL;
 218         int error = 0;
 219         struct ng_mesg *msg;
 220
 221         NGI_GET_MSG(item, msg);
 222
 223         if (msg->header.typecookie != NGM_DEFLATE_COOKIE)
 224                 ERROUT(EINVAL);
 225
 226         switch (msg->header.cmd) {
 227         case NGM_DEFLATE_CONFIG:
 228             {
 229                 struct ng_deflate_config *const cfg
 230                     = (struct ng_deflate_config *)msg->data;
 231
 232                 /* Check configuration. */
 233                 if (msg->header.arglen != sizeof(*cfg))
 234                         ERROUT(EINVAL);
 235                 if (cfg->enable) {
 236                     if (cfg->windowBits < 8 || cfg->windowBits > 15)
 237                         ERROUT(EINVAL);
 238                 } else
 239                     cfg->windowBits = 0;
 240
 241                 /* Clear previous state. */
 242                 if (priv->cfg.enable) {
 243                         if (priv->compress)
 244                                 deflateEnd(&priv->cx);
 245                         else
 246                                 inflateEnd(&priv->cx);
 247                         priv->cfg.enable = 0;
 248                 }
 249
 250                 /* Configuration is OK, reset to it. */
 251                 priv->cfg = *cfg;
 252
 253                 if (priv->cfg.enable) {
 254                         priv->cx.next_in = NULL;
 255                         priv->cx.zalloc = z_alloc;
 256                         priv->cx.zfree = z_free;
 257                         int res;
 258                         if (priv->compress) {
 259                                 if ((res = deflateInit2(&priv->cx,
 260                                     Z_DEFAULT_COMPRESSION, Z_DEFLATED,
 261                                     -cfg->windowBits, 8,
 262                                     Z_DEFAULT_STRATEGY)) != Z_OK) {
 263                                         log(LOG_NOTICE,
 264                                             "deflateInit2: error %d, %s\n",
 265                                             res, priv->cx.msg);
 266                                         priv->cfg.enable = 0;
 267                                         ERROUT(ENOMEM);
 268                                 }
 269                         } else {
 270                                 if ((res = inflateInit2(&priv->cx,
 271                                     -cfg->windowBits)) != Z_OK) {
 272                                         log(LOG_NOTICE,
 273                                             "inflateInit2: error %d, %s\n",
 274                                             res, priv->cx.msg);
 275                                         priv->cfg.enable = 0;
 276                                         ERROUT(ENOMEM);
 277                                 }
 278                         }
 279                 }
 280
 281                 /* Initialize other state. */
 282                 priv->seqnum = 0;
 283
 284                 /* Save return address so we can send reset-req's */
 285                 priv->ctrlnode = NGI_RETADDR(item);
 286                 break;
 287             }
 288
 289         case NGM_DEFLATE_RESETREQ:
 290                 ng_deflate_reset_req(node);
 291                 break;
 292
 293         case NGM_DEFLATE_GET_STATS:
 294         case NGM_DEFLATE_CLR_STATS:
 295         case NGM_DEFLATE_GETCLR_STATS:
 296                 /* Create response if requested. */
 297                 if (msg->header.cmd != NGM_DEFLATE_CLR_STATS) {
 298                         NG_MKRESPONSE(resp, msg,
 299                             sizeof(struct ng_deflate_stats), M_WAITOK | M_NULLOK);
 300                         if (resp == NULL)
 301                                 ERROUT(ENOMEM);
 302                         bcopy(&priv->stats, resp->data,
 303                             sizeof(struct ng_deflate_stats));
 304                 }
 305
 306                 /* Clear stats if requested. */
 307                 if (msg->header.cmd != NGM_DEFLATE_GET_STATS)
 308                         bzero(&priv->stats,
 309                             sizeof(struct ng_deflate_stats));
 310                 break;
 311
 312         default:
 313                 error = EINVAL;
 314                 break;
 315         }
 316 done:
 317         NG_RESPOND_MSG(error, node, item, resp);
 318         NG_FREE_MSG(msg);
 319         return (error);
 320 }
 321
 322 /*
 323  * Receive incoming data on our hook.
 324  */
 325 static int
 326 ng_deflate_rcvdata(hook_p hook, item_p item)
 327 {
 328         const node_p node = NG_HOOK_NODE(hook);
 329         const priv_p priv = NG_NODE_PRIVATE(node);
 330         struct mbuf *m, *out;
 331         int error;
 332
 333         if (!priv->cfg.enable) {
 334                 NG_FREE_ITEM(item);
 335                 return (ENXIO);
 336         }
 337
 338         NGI_GET_M(item, m);
 339         /* Compress */
 340         if (priv->compress) {
 341                 if ((error = ng_deflate_compress(node, m, &out)) != 0) {
 342                         NG_FREE_ITEM(item);
 343                         log(LOG_NOTICE, "%s: error: %d\n", __func__, error);
 344                         return (error);
 345                 }
 346
 347         } else { /* Decompress */
 348                 if ((error = ng_deflate_decompress(node, m, &out)) != 0) {
 349                         NG_FREE_ITEM(item);
 350                         log(LOG_NOTICE, "%s: error: %d\n", __func__, error);
 351                         if (priv->ctrlnode != 0) {
 352                                 struct ng_mesg *msg;
 353
 354                                 /* Need to send a reset-request. */
 355                                 NG_MKMESSAGE(msg, NGM_DEFLATE_COOKIE,
 356                                     NGM_DEFLATE_RESETREQ, 0, M_WAITOK | M_NULLOK);
 357                                 if (msg == NULL)
 358                                         return (error);
 359                                 NG_SEND_MSG_ID(error, node, msg,
 360                                         priv->ctrlnode, 0);
 361                         }
 362                         return (error);
 363                 }
 364         }
 365
 366         NG_FWD_NEW_DATA(error, item, hook, out);
 367         return (error);
 368 }
 369
 370 /*
 371  * Destroy node.
 372  */
 373 static int
 374 ng_deflate_shutdown(node_p node)
 375 {
 376         const priv_p priv = NG_NODE_PRIVATE(node);
 377
 378         /* Take down netgraph node. */
 379         if (priv->cfg.enable) {
 380             if (priv->compress)
 381                 deflateEnd(&priv->cx);
 382             else
 383                 inflateEnd(&priv->cx);
 384         }
 385
 386         kfree(priv, M_NETGRAPH_DEFLATE);
 387         NG_NODE_SET_PRIVATE(node, NULL);
 388         NG_NODE_UNREF(node);            /* let the node escape */
 389         return (0);
 390 }
 391
 392 /*
 393  * Hook disconnection
 394  */
 395 static int
 396 ng_deflate_disconnect(hook_p hook)
 397 {
 398         const node_p node = NG_HOOK_NODE(hook);
 399         const priv_p priv = NG_NODE_PRIVATE(node);
 400
 401         if (priv->cfg.enable) {
 402             if (priv->compress)
 403                 deflateEnd(&priv->cx);
 404             else
 405                 inflateEnd(&priv->cx);
 406             priv->cfg.enable = 0;
 407         }
 408
 409         /* Go away if no longer connected. */
 410         if ((NG_NODE_NUMHOOKS(node) == 0) && NG_NODE_IS_VALID(node))
 411                 ng_rmnode_self(node);
 412         return (0);
 413 }
 414
 415 /************************************************************************
 416                         HELPER STUFF
 417  ************************************************************************/
 418
 419 /*
 420  * Space allocation and freeing routines for use by zlib routines.
 421  */
 422
 423 static void *
 424 z_alloc(void *notused, u_int items, u_int size)
 425 {
 426
 427         return (kmalloc(items * size, M_NETGRAPH_DEFLATE, M_WAITOK | M_NULLOK));
 428 }
 429
 430 static void
 431 z_free(void *notused, void *ptr)
 432 {
 433
 434         kfree(ptr, M_NETGRAPH_DEFLATE);
 435 }
 436
 437 /*
 438  * Compress/encrypt a packet and put the result in a new mbuf at *resultp.
 439  * The original mbuf is not free'd.
 440  */
 441 static int
 442 ng_deflate_compress(node_p node, struct mbuf *m, struct mbuf **resultp)
 443 {
 444         const priv_p    priv = NG_NODE_PRIVATE(node);
 445         int             outlen, inlen;
 446         int             rtn;
 447
 448         /* Initialize. */
 449         *resultp = NULL;
 450
 451         inlen = m->m_pkthdr.len;
 452
 453         priv->stats.FramesPlain++;
 454         priv->stats.InOctets+=inlen;
 455
 456         if (inlen > DEFLATE_BUF_SIZE) {
 457                 priv->stats.Errors++;
 458                 NG_FREE_M(m);
 459                 return (ENOMEM);
 460         }
 461
 462         /* Work with contiguous regions of memory. */
 463         m_copydata(m, 0, inlen, (caddr_t)priv->inbuf);
 464         outlen = DEFLATE_BUF_SIZE;
 465
 466         /* Compress "inbuf" into "outbuf". */
 467         /* Prepare to compress. */
 468         if (priv->inbuf[0] != 0) {
 469                 priv->cx.next_in = priv->inbuf;
 470                 priv->cx.avail_in = inlen;
 471         } else {
 472                 priv->cx.next_in = priv->inbuf + 1; /* compress protocol */
 473                 priv->cx.avail_in = inlen - 1;
 474         }
 475         priv->cx.next_out = priv->outbuf + 2 + DEFLATE_HDRLEN;
 476         priv->cx.avail_out = outlen - 2 - DEFLATE_HDRLEN;
 477
 478         /* Compress. */
 479         rtn = deflate(&priv->cx, Z_PACKET_FLUSH);
 480
 481         /* Check return value. */
 482         if (rtn != Z_OK) {
 483                 priv->stats.Errors++;
 484                 log(LOG_NOTICE, "ng_deflate: compression error: %d (%s)\n",
 485                     rtn, priv->cx.msg);
 486                 NG_FREE_M(m);
 487                 return (EINVAL);
 488         }
 489
 490         /* Calculate resulting size. */
 491         outlen -= priv->cx.avail_out;
 492
 493         /* If we can't compress this packet, send it as-is. */
 494         if (outlen > inlen) {
 495                 /* Return original packet uncompressed. */
 496                 *resultp = m;
 497                 priv->stats.FramesUncomp++;
 498                 priv->stats.OutOctets+=inlen;
 499         } else {
 500                 NG_FREE_M(m);
 501
 502                 /* Install header. */
 503                 ((u_int16_t *)priv->outbuf)[0] = htons(PROT_COMPD);
 504                 ((u_int16_t *)priv->outbuf)[1] = htons(priv->seqnum);
 505
 506                 /* Return packet in an mbuf. */
 507                 *resultp = m_devget((caddr_t)priv->outbuf, outlen, 0, NULL);
 508                 if (*resultp == NULL) {
 509                         priv->stats.Errors++;
 510                         return (ENOMEM);
 511                 }
 512                 priv->stats.FramesComp++;
 513                 priv->stats.OutOctets+=outlen;
 514         }
 515
 516         /* Update sequence number. */
 517         priv->seqnum++;
 518
 519         return (0);
 520 }
 521
 522 /*
 523  * Decompress/decrypt packet and put the result in a new mbuf at *resultp.
 524  * The original mbuf is not free'd.
 525  */
 526 static int
 527 ng_deflate_decompress(node_p node, struct mbuf *m, struct mbuf **resultp)
 528 {
 529         const priv_p    priv = NG_NODE_PRIVATE(node);
 530         int             outlen, inlen;
 531         int             rtn;
 532         uint16_t        proto;
 533         int             offset;
 534         uint16_t        rseqnum;
 535
 536         /* Initialize. */
 537         *resultp = NULL;
 538
 539         inlen = m->m_pkthdr.len;
 540
 541         if (inlen > DEFLATE_BUF_SIZE) {
 542                 priv->stats.Errors++;
 543                 NG_FREE_M(m);
 544                 priv->seqnum = 0;
 545                 return (ENOMEM);
 546         }
 547
 548         /* Work with contiguous regions of memory. */
 549         m_copydata(m, 0, inlen, (caddr_t)priv->inbuf);
 550
 551         /* Separate proto. */
 552         if ((priv->inbuf[0] & 0x01) != 0) {
 553                 proto = priv->inbuf[0];
 554                 offset = 1;
 555         } else {
 556                 proto = ntohs(((uint16_t *)priv->inbuf)[0]);
 557                 offset = 2;
 558         }
 559
 560         priv->stats.InOctets += inlen;
 561
 562         /* Packet is compressed, so decompress. */
 563         if (proto == PROT_COMPD) {
 564                 priv->stats.FramesComp++;
 565
 566                 /* Check sequence number. */
 567                 rseqnum = ntohs(((uint16_t *)(priv->inbuf + offset))[0]);
 568                 offset += 2;
 569                 if (rseqnum != priv->seqnum) {
 570                         priv->stats.Errors++;
 571                         log(LOG_NOTICE, "ng_deflate: wrong sequence: %u "
 572                             "instead of %u\n", rseqnum, priv->seqnum);
 573                         NG_FREE_M(m);
 574                         priv->seqnum = 0;
 575                         return (EPIPE);
 576                 }
 577
 578                 outlen = DEFLATE_BUF_SIZE;
 579
 580                 /* Decompress "inbuf" into "outbuf". */
 581                 /* Prepare to decompress. */
 582                 priv->cx.next_in = priv->inbuf + offset;
 583                 priv->cx.avail_in = inlen - offset;
 584                 /* Reserve space for protocol decompression. */
 585                 priv->cx.next_out = priv->outbuf + 1;
 586                 priv->cx.avail_out = outlen - 1;
 587
 588                 /* Decompress. */
 589                 rtn = inflate(&priv->cx, Z_PACKET_FLUSH);
 590
 591                 /* Check return value. */
 592                 if (rtn != Z_OK && rtn != Z_STREAM_END) {
 593                         priv->stats.Errors++;
 594                         NG_FREE_M(m);
 595                         priv->seqnum = 0;
 596                         log(LOG_NOTICE, "%s: decompression error: %d (%s)\n",
 597                             __func__, rtn, priv->cx.msg);
 598
 599                         switch (rtn) {
 600                         case Z_MEM_ERROR:
 601                                 return (ENOMEM);
 602                         case Z_DATA_ERROR:
 603                                 return (EIO);
 604                         default:
 605                                 return (EINVAL);
 606                         }
 607                 }
 608
 609                 /* Calculate resulting size. */
 610                 outlen -= priv->cx.avail_out;
 611
 612                 NG_FREE_M(m);
 613
 614                 /* Decompress protocol. */
 615                 if ((priv->outbuf[1] & 0x01) != 0) {
 616                         priv->outbuf[0] = 0;
 617                         /* Return packet in an mbuf. */
 618                         *resultp = m_devget((caddr_t)priv->outbuf, outlen, 0,
 619                                             NULL);
 620                 } else {
 621                         outlen--;
 622                         /* Return packet in an mbuf. */
 623                         *resultp = m_devget((caddr_t)(priv->outbuf + 1),
 624                                             outlen, 0, NULL);
 625                 }
 626                 if (*resultp == NULL) {
 627                         priv->stats.Errors++;
 628                         priv->seqnum = 0;
 629                         return (ENOMEM);
 630                 }
 631                 priv->stats.FramesPlain++;
 632                 priv->stats.OutOctets+=outlen;
 633
 634         } else { /* Packet is not compressed, just update dictionary. */
 635                 priv->stats.FramesUncomp++;
 636                 if (priv->inbuf[0] == 0) {
 637                     priv->cx.next_in = priv->inbuf + 1; /* compress protocol */
 638                     priv->cx.avail_in = inlen - 1;
 639                 } else {
 640                     priv->cx.next_in = priv->inbuf;
 641                     priv->cx.avail_in = inlen;
 642                 }
 643
 644                 rtn = inflateIncomp(&priv->cx);
 645
 646                 /* Check return value */
 647                 if (rtn != Z_OK) {
 648                         priv->stats.Errors++;
 649                         log(LOG_NOTICE, "%s: inflateIncomp error: %d (%s)\n",
 650                             __func__, rtn, priv->cx.msg);
 651                         NG_FREE_M(m);
 652                         priv->seqnum = 0;
 653                         return (EINVAL);
 654                 }
 655
 656                 *resultp = m;
 657                 priv->stats.FramesPlain++;
 658                 priv->stats.OutOctets += inlen;
 659         }
 660
 661         /* Update sequence number. */
 662         priv->seqnum++;
 663
 664         return (0);
 665 }
 666
 667 /*
 668  * The peer has sent us a CCP ResetRequest, so reset our transmit state.
 669  */
 670 static void
 671 ng_deflate_reset_req(node_p node)
 672 {
 673         const priv_p priv = NG_NODE_PRIVATE(node);
 674
 675         priv->seqnum = 0;
 676         if (priv->cfg.enable) {
 677             if (priv->compress)
 678                 deflateReset(&priv->cx);
 679             else
 680                 inflateReset(&priv->cx);
 681         }
 682 }
 683