packet-sna.c

   1 /* packet-sna.c
   2  * Routines for SNA
   3  * Gilbert Ramirez <gram@alumni.rice.edu>
   4  *
   5  * $Id: packet-sna.c,v 1.38 2002/01/21 07:36:43 guy Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@ethereal.com>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  24  */
  25
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #ifdef HAVE_SYS_TYPES_H
  31 # include <sys/types.h>
  32 #endif
  33
  34 #include <glib.h>
  35 #include <epan/packet.h>
  36 #include "llcsaps.h"
  37 #include <epan/sna-utils.h>
  38
  39 /*
  40  * http://www.wanresources.com/snacell.html
  41  *
  42  */
  43
  44 static int proto_sna = -1;
  45 static int hf_sna_th = -1;
  46 static int hf_sna_th_0 = -1;
  47 static int hf_sna_th_fid = -1;
  48 static int hf_sna_th_mpf = -1;
  49 static int hf_sna_th_odai = -1;
  50 static int hf_sna_th_efi = -1;
  51 static int hf_sna_th_daf = -1;
  52 static int hf_sna_th_oaf = -1;
  53 static int hf_sna_th_snf = -1;
  54 static int hf_sna_th_dcf = -1;
  55 static int hf_sna_th_lsid = -1;
  56 static int hf_sna_th_tg_sweep = -1;
  57 static int hf_sna_th_er_vr_supp_ind = -1;
  58 static int hf_sna_th_vr_pac_cnt_ind = -1;
  59 static int hf_sna_th_ntwk_prty = -1;
  60 static int hf_sna_th_tgsf = -1;
  61 static int hf_sna_th_mft = -1;
  62 static int hf_sna_th_piubf = -1;
  63 static int hf_sna_th_iern = -1;
  64 static int hf_sna_th_nlpoi = -1;
  65 static int hf_sna_th_nlp_cp = -1;
  66 static int hf_sna_th_ern = -1;
  67 static int hf_sna_th_vrn = -1;
  68 static int hf_sna_th_tpf = -1;
  69 static int hf_sna_th_vr_cwi = -1;
  70 static int hf_sna_th_tg_nonfifo_ind = -1;
  71 static int hf_sna_th_vr_sqti = -1;
  72 static int hf_sna_th_tg_snf = -1;
  73 static int hf_sna_th_vrprq = -1;
  74 static int hf_sna_th_vrprs = -1;
  75 static int hf_sna_th_vr_cwri = -1;
  76 static int hf_sna_th_vr_rwi = -1;
  77 static int hf_sna_th_vr_snf_send = -1;
  78 static int hf_sna_th_dsaf = -1;
  79 static int hf_sna_th_osaf = -1;
  80 static int hf_sna_th_snai = -1;
  81 static int hf_sna_th_def = -1;
  82 static int hf_sna_th_oef = -1;
  83 static int hf_sna_th_sa = -1;
  84 static int hf_sna_th_cmd_fmt = -1;
  85 static int hf_sna_th_cmd_type = -1;
  86 static int hf_sna_th_cmd_sn = -1;
  87
  88 static int hf_sna_rh = -1;
  89 static int hf_sna_rh_0 = -1;
  90 static int hf_sna_rh_1 = -1;
  91 static int hf_sna_rh_2 = -1;
  92 static int hf_sna_rh_rri = -1;
  93 static int hf_sna_rh_ru_category = -1;
  94 static int hf_sna_rh_fi = -1;
  95 static int hf_sna_rh_sdi = -1;
  96 static int hf_sna_rh_bci = -1;
  97 static int hf_sna_rh_eci = -1;
  98 static int hf_sna_rh_dr1 = -1;
  99 static int hf_sna_rh_lcci = -1;
 100 static int hf_sna_rh_dr2 = -1;
 101 static int hf_sna_rh_eri = -1;
 102 static int hf_sna_rh_rti = -1;
 103 static int hf_sna_rh_rlwi = -1;
 104 static int hf_sna_rh_qri = -1;
 105 static int hf_sna_rh_pi = -1;
 106 static int hf_sna_rh_bbi = -1;
 107 static int hf_sna_rh_ebi = -1;
 108 static int hf_sna_rh_cdi = -1;
 109 static int hf_sna_rh_csi = -1;
 110 static int hf_sna_rh_edi = -1;
 111 static int hf_sna_rh_pdi = -1;
 112 static int hf_sna_rh_cebi = -1;
 113 /*static int hf_sna_ru = -1;*/
 114
 115 static gint ett_sna = -1;
 116 static gint ett_sna_th = -1;
 117 static gint ett_sna_th_fid = -1;
 118 static gint ett_sna_rh = -1;
 119 static gint ett_sna_rh_0 = -1;
 120 static gint ett_sna_rh_1 = -1;
 121 static gint ett_sna_rh_2 = -1;
 122
 123 static dissector_handle_t data_handle;
 124
 125 /* Format Identifier */
 126 static const value_string sna_th_fid_vals[] = {
 127         { 0x0,  "SNA device <--> Non-SNA Device" },
 128         { 0x1,  "Subarea Nodes, without ER or VR" },
 129         { 0x2,  "Subarea Node <--> PU2" },
 130         { 0x3,  "Subarea Node or SNA host <--> Subarea Node" },
 131         { 0x4,  "Subarea Nodes, supporting ER and VR" },
 132         { 0x5,  "HPR RTP endpoint nodes" },
 133         { 0xf,  "Adjaced Subarea Nodes, supporting ER and VR" },
 134         { 0x0,  NULL }
 135 };
 136
 137 /* Mapping Field */
 138 static const value_string sna_th_mpf_vals[] = {
 139         { 0, "Middle segment of a BIU" },
 140         { 1, "Last segment of a BIU" },
 141         { 2, "First segment of a BIU" },
 142         { 3 , "Whole BIU" },
 143         { 0,   NULL }
 144 };
 145
 146 /* Expedited Flow Indicator */
 147 static const value_string sna_th_efi_vals[] = {
 148         { 0, "Normal Flow" },
 149         { 1, "Expedited Flow" },
 150         { 0x0,  NULL }
 151 };
 152
 153 /* Request/Response Indicator */
 154 static const value_string sna_rh_rri_vals[] = {
 155         { 0, "Request" },
 156         { 1, "Response" },
 157         { 0x0,  NULL }
 158 };
 159
 160 /* Request/Response Unit Category */
 161 static const value_string sna_rh_ru_category_vals[] = {
 162         { 0, "Function Management Data (FMD)" },
 163         { 1, "Network Control (NC)" },
 164         { 2, "Data Flow Control (DFC)" },
 165         { 3, "Session Control (SC)" },
 166         { 0x0,  NULL }
 167 };
 168
 169 /* Format Indicator */
 170 static const true_false_string sna_rh_fi_truth =
 171         { "FM Header", "No FM Header" };
 172
 173 /* Sense Data Included */
 174 static const true_false_string sna_rh_sdi_truth =
 175         { "Included", "Not Included" };
 176
 177 /* Begin Chain Indicator */
 178 static const true_false_string sna_rh_bci_truth =
 179         { "First in Chain", "Not First in Chain" };
 180
 181 /* End Chain Indicator */
 182 static const true_false_string sna_rh_eci_truth =
 183         { "Last in Chain", "Not Last in Chain" };
 184
 185 /* Lengith-Checked Compression Indicator */
 186 static const true_false_string sna_rh_lcci_truth =
 187         { "Compressed", "Not Compressed" };
 188
 189 /* Response Type Indicator */
 190 static const true_false_string sna_rh_rti_truth =
 191         { "Negative", "Positive" };
 192
 193 /* Exception Response Indicator */
 194 static const true_false_string sna_rh_eri_truth =
 195         { "Exception", "Definite" };
 196
 197 /* Queued Response Indicator */
 198 static const true_false_string sna_rh_qri_truth =
 199         { "Enqueue response in TC queues", "Response bypasses TC queues" };
 200
 201 /* Code Selection Indicator */
 202 static const value_string sna_rh_csi_vals[] = {
 203         { 0, "EBCDIC" },
 204         { 1, "ASCII" },
 205         { 0x0,  NULL }
 206 };
 207
 208 /* TG Sweep */
 209 static const value_string sna_th_tg_sweep_vals[] = {
 210         { 0, "This PIU may overtake any PU ahead of it." },
 211         { 1, "This PIU does not ovetake any PIU ahead of it." },
 212         { 0x0,  NULL }
 213 };
 214
 215 /* ER_VR_SUPP_IND */
 216 static const value_string sna_th_er_vr_supp_ind_vals[] = {
 217         { 0, "Each node supports ER and VR protocols" },
 218         { 1, "Includes at least one node that does not support ER and VR protocols"  },
 219         { 0x0,  NULL }
 220 };
 221
 222 /* VR_PAC_CNT_IND */
 223 static const value_string sna_th_vr_pac_cnt_ind_vals[] = {
 224         { 0, "Pacing count on the VR has not reached 0" },
 225         { 1, "Pacing count on the VR has reached 0" },
 226         { 0x0,  NULL }
 227 };
 228
 229 /* NTWK_PRTY */
 230 static const value_string sna_th_ntwk_prty_vals[] = {
 231         { 0, "PIU flows at a lower priority" },
 232         { 1, "PIU flows at network priority (highest transmission priority)" },
 233         { 0x0,  NULL }
 234 };
 235
 236 /* TGSF */
 237 static const value_string sna_th_tgsf_vals[] = {
 238         { 0, "Not segmented" },
 239         { 1, "Last segment" },
 240         { 2, "First segment" },
 241         { 3, "Middle segment" },
 242         { 0x0,  NULL }
 243 };
 244
 245 /* PIUBF */
 246 static const value_string sna_th_piubf_vals[] = {
 247         { 0, "Single PIU frame" },
 248         { 1, "Last PIU of a multiple PIU frame" },
 249         { 2, "First PIU of a multiple PIU frame" },
 250         { 3, "Middle PIU of a multiple PIU frame" },
 251         { 0x0,  NULL }
 252 };
 253
 254 /* NLPOI */
 255 static const value_string sna_th_nlpoi_vals[] = {
 256         { 0, "NLP starts within this FID4 TH" },
 257         { 1, "NLP byte 0 starts after RH byte 0 following NLP C/P pad" },
 258         { 0x0,  NULL }
 259 };
 260
 261 /* TPF */
 262 static const value_string sna_th_tpf_vals[] = {
 263         { 0, "Low Priority" },
 264         { 1, "Medium Priority" },
 265         { 2, "High Priority" },
 266         { 0x0,  NULL }
 267 };
 268
 269 /* VR_CWI */
 270 static const value_string sna_th_vr_cwi_vals[] = {
 271         { 0, "Increment window size" },
 272         { 1, "Decrement window size" },
 273         { 0x0,  NULL }
 274 };
 275
 276 /* TG_NONFIFO_IND */
 277 static const true_false_string sna_th_tg_nonfifo_ind_truth =
 278         { "TG FIFO is not required", "TG FIFO is required" };
 279
 280 /* VR_SQTI */
 281 static const value_string sna_th_vr_sqti_vals[] = {
 282         { 0, "Non-sequenced, Non-supervisory" },
 283         { 1, "Non-sequenced, Supervisory" },
 284         { 2, "Singly-sequenced" },
 285         { 0x0,  NULL }
 286 };
 287
 288 /* VRPRQ */
 289 static const true_false_string sna_th_vrprq_truth = {
 290         "VR pacing request is sent asking for a VR pacing response",
 291         "No VR pacing response is requested",
 292 };
 293
 294 /* VRPRS */
 295 static const true_false_string sna_th_vrprs_truth = {
 296         "VR pacing response is sent in response to a VRPRQ bit set",
 297         "No pacing response sent",
 298 };
 299
 300 /* VR_CWRI */
 301 static const value_string sna_th_vr_cwri_vals[] = {
 302         { 0, "Increment window size by 1" },
 303         { 1, "Decrement window size by 1" },
 304         { 0x0,  NULL }
 305 };
 306
 307 /* VR_RWI */
 308 static const true_false_string sna_th_vr_rwi_truth = {
 309         "Reset window size to the minimum specified in NC_ACTVR",
 310         "Do not reset window size",
 311 };
 312
 313 static int  dissect_fid0_1 (tvbuff_t*, packet_info*, proto_tree*);
 314 static int  dissect_fid2 (tvbuff_t*, packet_info*, proto_tree*);
 315 static int  dissect_fid3 (tvbuff_t*, proto_tree*);
 316 static int  dissect_fid4 (tvbuff_t*, packet_info*, proto_tree*);
 317 static int  dissect_fid5 (tvbuff_t*, proto_tree*);
 318 static int  dissect_fidf (tvbuff_t*, proto_tree*);
 319 static void dissect_rh (tvbuff_t*, int, proto_tree*);
 320
 321 static void
 322 dissect_sna(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 323 {
 324
 325         proto_tree      *sna_tree = NULL, *th_tree = NULL, *rh_tree = NULL;
 326         proto_item      *sna_ti = NULL, *th_ti = NULL, *rh_ti = NULL;
 327         guint8          th_fid;
 328         int             sna_header_len = 0, th_header_len = 0;
 329         int             offset;
 330
 331         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 332                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "SNA");
 333         if (check_col(pinfo->cinfo, COL_INFO))
 334                 col_clear(pinfo->cinfo, COL_INFO);
 335
 336         /* SNA data should be printed in EBCDIC, not ASCII */
 337         pinfo->fd->flags.encoding = CHAR_EBCDIC;
 338
 339         /* Transmission Header Format Identifier */
 340         th_fid = hi_nibble(tvb_get_guint8(tvb, 0));
 341
 342         /* Summary information */
 343         if (check_col(pinfo->cinfo, COL_INFO))
 344                 col_add_str(pinfo->cinfo, COL_INFO,
 345                                 val_to_str(th_fid, sna_th_fid_vals, "Unknown FID: %01x"));
 346
 347         if (tree) {
 348
 349                 /* Don't bother setting length. We'll set it later after we find
 350                  * the lengths of TH/RH/RU */
 351                 sna_ti = proto_tree_add_item(tree, proto_sna, tvb, 0, -1, FALSE);
 352                 sna_tree = proto_item_add_subtree(sna_ti, ett_sna);
 353
 354                 /* --- TH --- */
 355                 /* Don't bother setting length. We'll set it later after we find
 356                  * the length of TH */
 357                 th_ti = proto_tree_add_item(sna_tree, hf_sna_th, tvb,  0, -1, FALSE);
 358                 th_tree = proto_item_add_subtree(th_ti, ett_sna_th);
 359         }
 360
 361         /* Get size of TH */
 362         switch(th_fid) {
 363                 case 0x0:
 364                 case 0x1:
 365                         th_header_len = dissect_fid0_1(tvb, pinfo, th_tree);
 366                         break;
 367                 case 0x2:
 368                         th_header_len = dissect_fid2(tvb, pinfo, th_tree);
 369                         break;
 370                 case 0x3:
 371                         th_header_len = dissect_fid3(tvb, th_tree);
 372                         break;
 373                 case 0x4:
 374                         th_header_len = dissect_fid4(tvb, pinfo, th_tree);
 375                         break;
 376                 case 0x5:
 377                         th_header_len = dissect_fid5(tvb, th_tree);
 378                         break;
 379                 case 0xf:
 380                         th_header_len = dissect_fidf(tvb, th_tree);
 381                         break;
 382                 default:
 383                         call_dissector(data_handle,tvb_new_subset(tvb, 1,-1,tvb_reported_length_remaining(tvb,1)), pinfo, tree);
 384         }
 385
 386         sna_header_len += th_header_len;
 387         offset = th_header_len;
 388
 389         if (tree) {
 390                 proto_item_set_len(th_ti, th_header_len);
 391
 392                 /* --- RH --- */
 393                 rh_ti = proto_tree_add_item(sna_tree, hf_sna_rh, tvb, offset, 3, FALSE);
 394                 rh_tree = proto_item_add_subtree(rh_ti, ett_sna_rh);
 395                 dissect_rh(tvb, offset, rh_tree);
 396
 397                 sna_header_len += 3;
 398                 offset += 3;
 399                 proto_item_set_len(sna_ti, sna_header_len);
 400         }
 401         else {
 402                 sna_header_len += 3;
 403                 offset += 3;
 404         }
 405
 406         if (tvb_offset_exists(tvb, offset+1)) {
 407                 call_dissector(data_handle,tvb_new_subset(tvb, offset, -1, tvb_reported_length_remaining(tvb,offset)),pinfo, tree);
 408         }
 409 }
 410
 411 #define SNA_FID01_ADDR_LEN      2
 412
 413 /* FID Types 0 and 1 */
 414 static int
 415 dissect_fid0_1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 416 {
 417         proto_tree      *bf_tree;
 418         proto_item      *bf_item;
 419         guint8          th_0;
 420         const guint8    *ptr;
 421
 422         const int bytes_in_header = 10;
 423
 424         if (tree) {
 425                 /* Byte 0 */
 426                 th_0 = tvb_get_guint8(tvb, 0);
 427                 bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, 0, 1, th_0);
 428                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 429
 430                 proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, 0, 1, th_0);
 431                 proto_tree_add_uint(bf_tree, hf_sna_th_mpf, tvb, 0, 1, th_0);
 432                 proto_tree_add_uint(bf_tree, hf_sna_th_efi, tvb, 0, 1, th_0);
 433
 434                 /* Byte 1 */
 435                 proto_tree_add_text(tree, tvb, 1, 1, "Reserved");
 436
 437                 /* Bytes 2-3 */
 438                 proto_tree_add_item(tree, hf_sna_th_daf, tvb, 2, 2, FALSE);
 439         }
 440
 441         /* Set DST addr */
 442         ptr = tvb_get_ptr(tvb, 2, SNA_FID01_ADDR_LEN);
 443         SET_ADDRESS(&pinfo->net_dst, AT_SNA, SNA_FID01_ADDR_LEN, ptr);
 444         SET_ADDRESS(&pinfo->dst, AT_SNA, SNA_FID01_ADDR_LEN, ptr);
 445
 446         if (tree) {
 447                 proto_tree_add_item(tree, hf_sna_th_oaf, tvb, 4, 2, FALSE);
 448         }
 449
 450         /* Set SRC addr */
 451         ptr = tvb_get_ptr(tvb, 4, SNA_FID01_ADDR_LEN);
 452         SET_ADDRESS(&pinfo->net_src, AT_SNA, SNA_FID01_ADDR_LEN, ptr);
 453         SET_ADDRESS(&pinfo->src, AT_SNA, SNA_FID01_ADDR_LEN, ptr);
 454
 455         /* If we're not filling a proto_tree, return now */
 456         if (tree) {
 457                 return bytes_in_header;
 458         }
 459
 460         proto_tree_add_item(tree, hf_sna_th_snf, tvb, 6, 2, FALSE);
 461         proto_tree_add_item(tree, hf_sna_th_dcf, tvb, 8, 2, FALSE);
 462
 463         return bytes_in_header;
 464 }
 465
 466 #define SNA_FID2_ADDR_LEN       1
 467
 468 /* FID Type 2 */
 469 static int
 470 dissect_fid2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 471 {
 472         proto_tree      *bf_tree;
 473         proto_item      *bf_item;
 474         guint8          th_0=0, daf=0, oaf=0;
 475         const guint8    *ptr;
 476
 477         const int bytes_in_header = 6;
 478
 479         if (tree) {
 480                 th_0 = tvb_get_guint8(tvb, 0);
 481                 daf = tvb_get_guint8(tvb, 2);
 482                 oaf = tvb_get_guint8(tvb, 3);
 483
 484                 /* Byte 0 */
 485                 bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, 0, 1, th_0);
 486                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 487
 488                 proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, 0, 1, th_0);
 489                 proto_tree_add_uint(bf_tree, hf_sna_th_mpf, tvb, 0, 1, th_0);
 490                 proto_tree_add_uint(bf_tree, hf_sna_th_odai,tvb, 0, 1, th_0);
 491                 proto_tree_add_uint(bf_tree, hf_sna_th_efi, tvb, 0, 1, th_0);
 492
 493                 /* Byte 1 */
 494                 proto_tree_add_text(tree, tvb, 1, 1, "Reserved");
 495
 496                 /* Byte 2 */
 497                 proto_tree_add_uint_format(tree, hf_sna_th_daf, tvb, 2, 1, daf,
 498                                 "Destination Address Field: 0x%02x", daf);
 499         }
 500
 501         /* Set DST addr */
 502         ptr = tvb_get_ptr(tvb, 2, SNA_FID2_ADDR_LEN);
 503         SET_ADDRESS(&pinfo->net_dst, AT_SNA, SNA_FID2_ADDR_LEN, ptr);
 504         SET_ADDRESS(&pinfo->dst, AT_SNA, SNA_FID2_ADDR_LEN, ptr);
 505
 506         if (tree) {
 507                 /* Byte 3 */
 508                 proto_tree_add_uint_format(tree, hf_sna_th_oaf, tvb, 3, 1, oaf,
 509                                 "Origin Address Field: 0x%02x", oaf);
 510         }
 511
 512         /* Set SRC addr */
 513         ptr = tvb_get_ptr(tvb, 3, SNA_FID2_ADDR_LEN);
 514         SET_ADDRESS(&pinfo->net_src, AT_SNA, SNA_FID2_ADDR_LEN, ptr);
 515         SET_ADDRESS(&pinfo->src, AT_SNA, SNA_FID2_ADDR_LEN, ptr);
 516
 517         if (tree) {
 518                 proto_tree_add_item(tree, hf_sna_th_snf, tvb, 4, 2, FALSE);
 519         }
 520
 521         return bytes_in_header;
 522 }
 523
 524 /* FID Type 3 */
 525 static int
 526 dissect_fid3(tvbuff_t *tvb, proto_tree *tree)
 527 {
 528         proto_tree      *bf_tree;
 529         proto_item      *bf_item;
 530         guint8          th_0;
 531
 532         const int bytes_in_header = 2;
 533
 534         /* If we're not filling a proto_tree, return now */
 535         if (!tree) {
 536                 return bytes_in_header;
 537         }
 538
 539         th_0 = tvb_get_guint8(tvb, 0);
 540
 541         /* Create the bitfield tree */
 542         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, 0, 1, th_0);
 543         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 544
 545         proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, 0, 1, th_0);
 546         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, tvb, 0, 1, th_0);
 547         proto_tree_add_uint(bf_tree, hf_sna_th_efi, tvb, 0, 1, th_0);
 548
 549         proto_tree_add_item(tree, hf_sna_th_lsid, tvb, 1, 1, FALSE);
 550
 551         return bytes_in_header;
 552 }
 553
 554
 555 static int
 556 dissect_fid4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 557 {
 558         proto_tree      *bf_tree;
 559         proto_item      *bf_item;
 560         int             offset = 0;
 561         guint8          th_byte, mft;
 562         guint16         th_word;
 563         guint16         def, oef;
 564         guint32         dsaf, osaf;
 565         static struct sna_fid_type_4_addr src, dst;
 566
 567         const int bytes_in_header = 26;
 568
 569         /* If we're not filling a proto_tree, return now */
 570         if (!tree) {
 571                 return bytes_in_header;
 572         }
 573
 574         if (tree) {
 575                 th_byte = tvb_get_guint8(tvb, offset);
 576
 577                 /* Create the bitfield tree */
 578                 bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, offset, 1, th_byte);
 579                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 580
 581                 /* Byte 0 */
 582                 proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, offset, 1, th_byte);
 583                 proto_tree_add_uint(bf_tree, hf_sna_th_tg_sweep, tvb, offset, 1, th_byte);
 584                 proto_tree_add_uint(bf_tree, hf_sna_th_er_vr_supp_ind, tvb, offset, 1, th_byte);
 585                 proto_tree_add_uint(bf_tree, hf_sna_th_vr_pac_cnt_ind, tvb, offset, 1, th_byte);
 586                 proto_tree_add_uint(bf_tree, hf_sna_th_ntwk_prty, tvb, offset, 1, th_byte);
 587
 588                 offset += 1;
 589                 th_byte = tvb_get_guint8(tvb, offset);
 590
 591                 /* Create the bitfield tree */
 592                 bf_item = proto_tree_add_text(tree, tvb, offset, 1, "Transmision Header Byte 1");
 593                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 594
 595                 /* Byte 1 */
 596                 proto_tree_add_uint(bf_tree, hf_sna_th_tgsf, tvb, offset, 1, th_byte);
 597                 proto_tree_add_boolean(bf_tree, hf_sna_th_mft, tvb, offset, 1, th_byte);
 598                 proto_tree_add_uint(bf_tree, hf_sna_th_piubf, tvb, offset, 1, th_byte);
 599
 600                 mft = th_byte & 0x04;
 601                 offset += 1;
 602                 th_byte = tvb_get_guint8(tvb, offset);
 603
 604                 /* Create the bitfield tree */
 605                 bf_item = proto_tree_add_text(tree, tvb, offset, 1, "Transmision Header Byte 2");
 606                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 607
 608                 /* Byte 2 */
 609                 if (mft) {
 610                         proto_tree_add_uint(bf_tree, hf_sna_th_nlpoi, tvb, offset, 1, th_byte);
 611                         proto_tree_add_uint(bf_tree, hf_sna_th_nlp_cp, tvb, offset, 1, th_byte);
 612                 }
 613                 else {
 614                         proto_tree_add_uint(bf_tree, hf_sna_th_iern, tvb, offset, 1, th_byte);
 615                 }
 616                 proto_tree_add_uint(bf_tree, hf_sna_th_ern, tvb, offset, 1, th_byte);
 617
 618                 offset += 1;
 619                 th_byte = tvb_get_guint8(tvb, offset);
 620
 621                 /* Create the bitfield tree */
 622                 bf_item = proto_tree_add_text(tree, tvb, offset, 1, "Transmision Header Byte 3");
 623                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 624
 625                 /* Byte 3 */
 626                 proto_tree_add_uint(bf_tree, hf_sna_th_vrn, tvb, offset, 1, th_byte);
 627                 proto_tree_add_uint(bf_tree, hf_sna_th_tpf, tvb, offset, 1, th_byte);
 628
 629                 offset += 1;
 630                 th_word = tvb_get_ntohs(tvb, offset);
 631
 632                 /* Create the bitfield tree */
 633                 bf_item = proto_tree_add_text(tree, tvb, offset, 2, "Transmision Header Bytes 4-5");
 634                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 635
 636                 /* Bytes 4-5 */
 637                 proto_tree_add_uint(bf_tree, hf_sna_th_vr_cwi, tvb, offset, 2, th_word);
 638                 proto_tree_add_boolean(bf_tree, hf_sna_th_tg_nonfifo_ind, tvb, offset, 2, th_word);
 639                 proto_tree_add_uint(bf_tree, hf_sna_th_vr_sqti, tvb, offset, 2, th_word);
 640
 641                 /* I'm not sure about byte-order on this one... */
 642                 proto_tree_add_uint(bf_tree, hf_sna_th_tg_snf, tvb, offset, 2, th_word);
 643
 644                 offset += 2;
 645                 th_word = tvb_get_ntohs(tvb, offset);
 646
 647                 /* Create the bitfield tree */
 648                 bf_item = proto_tree_add_text(tree, tvb, offset, 2, "Transmision Header Bytes 6-7");
 649                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 650
 651                 /* Bytes 6-7 */
 652                 proto_tree_add_boolean(bf_tree, hf_sna_th_vrprq, tvb, offset, 2, th_word);
 653                 proto_tree_add_boolean(bf_tree, hf_sna_th_vrprs, tvb, offset, 2, th_word);
 654                 proto_tree_add_uint(bf_tree, hf_sna_th_vr_cwri, tvb, offset, 2, th_word);
 655                 proto_tree_add_boolean(bf_tree, hf_sna_th_vr_rwi, tvb, offset, 2, th_word);
 656
 657                 /* I'm not sure about byte-order on this one... */
 658                 proto_tree_add_uint(bf_tree, hf_sna_th_vr_snf_send, tvb, offset, 2, th_word);
 659
 660                 offset += 2;
 661         }
 662
 663         dsaf = tvb_get_ntohl(tvb, 8);
 664         if (tree) {
 665                 /* Bytes 8-11 */
 666                 proto_tree_add_uint(tree, hf_sna_th_dsaf, tvb, offset, 4, dsaf);
 667
 668                 offset += 4;
 669         }
 670
 671         osaf = tvb_get_ntohl(tvb, 12);
 672         if (tree) {
 673                 /* Bytes 12-15 */
 674                 proto_tree_add_uint(tree, hf_sna_th_osaf, tvb, offset, 4, osaf);
 675
 676                 offset += 4;
 677                 th_byte = tvb_get_guint8(tvb, offset);
 678
 679                 /* Create the bitfield tree */
 680                 bf_item = proto_tree_add_text(tree, tvb, offset, 2, "Transmision Header Byte 16");
 681                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 682
 683                 /* Byte 16 */
 684                 proto_tree_add_boolean(tree, hf_sna_th_snai, tvb, offset, 1, th_byte);
 685
 686                 /* We luck out here because in their infinite wisdom the SNA
 687                  * architects placed the MPF and EFI fields in the same bitfield
 688                  * locations, even though for FID4 they're not in byte 0.
 689                  * Thank you IBM! */
 690                 proto_tree_add_uint(tree, hf_sna_th_mpf, tvb, offset, 1, th_byte);
 691                 proto_tree_add_uint(tree, hf_sna_th_efi, tvb, offset, 1, th_byte);
 692
 693                 offset += 2; /* 1 for byte 16, 1 for byte 17 which is reserved */
 694         }
 695
 696
 697         def = tvb_get_ntohs(tvb, 18);
 698         if (tree) {
 699                 /* Bytes 18-25 */
 700                 proto_tree_add_uint(tree, hf_sna_th_def, tvb, offset, 2, def);
 701         }
 702
 703         /* Addresses in FID 4 are discontiguous, sigh */
 704         dst.saf = dsaf;
 705         dst.ef = def;
 706         SET_ADDRESS(&pinfo->net_dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN, (guint8* )&dst);
 707         SET_ADDRESS(&pinfo->dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN, (guint8 *)&dst);
 708
 709
 710         oef = tvb_get_ntohs(tvb, 20);
 711         if (tree) {
 712                 proto_tree_add_uint(tree, hf_sna_th_oef, tvb, offset+2, 2, oef);
 713         }
 714
 715         /* Addresses in FID 4 are discontiguous, sigh */
 716         src.saf = osaf;
 717         src.ef = oef;
 718         SET_ADDRESS(&pinfo->net_src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN, (guint8 *)&src);
 719         SET_ADDRESS(&pinfo->src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN, (guint8 *)&src);
 720
 721         if (tree) {
 722                 proto_tree_add_item(tree, hf_sna_th_snf, tvb, offset+4, 2, FALSE);
 723                 proto_tree_add_item(tree, hf_sna_th_dcf, tvb, offset+6, 2, FALSE);
 724         }
 725
 726         return bytes_in_header;
 727 }
 728
 729 /* FID Type 5 */
 730 static int
 731 dissect_fid5(tvbuff_t *tvb, proto_tree *tree)
 732 {
 733         proto_tree      *bf_tree;
 734         proto_item      *bf_item;
 735         guint8          th_0;
 736
 737         const int bytes_in_header = 12;
 738
 739         /* If we're not filling a proto_tree, return now */
 740         if (!tree) {
 741                 return bytes_in_header;
 742         }
 743
 744         th_0 = tvb_get_guint8(tvb, 0);
 745
 746         /* Create the bitfield tree */
 747         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, 0, 1, th_0);
 748         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 749
 750         proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, 0, 1, th_0);
 751         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, tvb, 0, 1, th_0);
 752         proto_tree_add_uint(bf_tree, hf_sna_th_efi, tvb, 0, 1, th_0);
 753
 754         proto_tree_add_text(tree, tvb, 1, 1, "Reserved");
 755         proto_tree_add_item(tree, hf_sna_th_snf, tvb, 2, 2, FALSE);
 756
 757         proto_tree_add_item(tree, hf_sna_th_sa, tvb, 4, 8, FALSE);
 758
 759         return bytes_in_header;
 760
 761 }
 762
 763 /* FID Type f */
 764 static int
 765 dissect_fidf(tvbuff_t *tvb, proto_tree *tree)
 766 {
 767         proto_tree      *bf_tree;
 768         proto_item      *bf_item;
 769         guint8          th_0;
 770
 771         const int bytes_in_header = 26;
 772
 773         /* If we're not filling a proto_tree, return now */
 774         if (!tree) {
 775                 return bytes_in_header;
 776         }
 777
 778         th_0 = tvb_get_guint8(tvb, 0);
 779
 780         /* Create the bitfield tree */
 781         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, 0, 1, th_0);
 782         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 783
 784         proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, 0, 1, th_0);
 785         proto_tree_add_text(tree, tvb, 1, 1, "Reserved");
 786
 787         proto_tree_add_item(tree, hf_sna_th_cmd_fmt, tvb,  2, 1, FALSE);
 788         proto_tree_add_item(tree, hf_sna_th_cmd_type, tvb, 3, 1, FALSE);
 789         proto_tree_add_item(tree, hf_sna_th_cmd_sn, tvb,   4, 2, FALSE);
 790
 791         /* Yup, bytes 6-23 are reserved! */
 792         proto_tree_add_text(tree, tvb, 6, 18, "Reserved");
 793
 794         proto_tree_add_item(tree, hf_sna_th_dcf, tvb, 24, 2, FALSE);
 795
 796         return bytes_in_header;
 797 }
 798
 799
 800 /* RH */
 801 static void
 802 dissect_rh(tvbuff_t *tvb, int offset, proto_tree *tree)
 803 {
 804         proto_tree      *bf_tree;
 805         proto_item      *bf_item;
 806         gboolean        is_response;
 807         guint8          rh_0, rh_1, rh_2;
 808
 809
 810         /* Create the bitfield tree for byte 0*/
 811         rh_0 = tvb_get_guint8(tvb, offset);
 812         is_response = (rh_0 & 0x80);
 813
 814         bf_item = proto_tree_add_uint(tree, hf_sna_rh_0, tvb, offset, 1, rh_0);
 815         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_0);
 816
 817         proto_tree_add_uint(bf_tree, hf_sna_rh_rri, tvb, offset, 1, rh_0);
 818         proto_tree_add_uint(bf_tree, hf_sna_rh_ru_category, tvb, offset, 1, rh_0);
 819         proto_tree_add_boolean(bf_tree, hf_sna_rh_fi, tvb, offset, 1, rh_0);
 820         proto_tree_add_boolean(bf_tree, hf_sna_rh_sdi, tvb, offset, 1, rh_0);
 821         proto_tree_add_boolean(bf_tree, hf_sna_rh_bci, tvb, offset, 1, rh_0);
 822         proto_tree_add_boolean(bf_tree, hf_sna_rh_eci, tvb, offset, 1, rh_0);
 823
 824         offset += 1;
 825         rh_1 = tvb_get_guint8(tvb, offset);
 826
 827         /* Create the bitfield tree for byte 1*/
 828         bf_item = proto_tree_add_uint(tree, hf_sna_rh_1, tvb, offset, 1, rh_1);
 829         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_1);
 830
 831         proto_tree_add_boolean(bf_tree, hf_sna_rh_dr1, tvb,  offset, 1, rh_1);
 832
 833         if (!is_response) {
 834                 proto_tree_add_boolean(bf_tree, hf_sna_rh_lcci, tvb, offset, 1, rh_1);
 835         }
 836
 837         proto_tree_add_boolean(bf_tree, hf_sna_rh_dr2, tvb,  offset, 1, rh_1);
 838
 839         if (is_response) {
 840                 proto_tree_add_boolean(bf_tree, hf_sna_rh_rti, tvb,  offset, 1, rh_1);
 841         }
 842         else {
 843                 proto_tree_add_boolean(bf_tree, hf_sna_rh_eri, tvb,  offset, 1, rh_1);
 844                 proto_tree_add_boolean(bf_tree, hf_sna_rh_rlwi, tvb, offset, 1, rh_1);
 845         }
 846
 847         proto_tree_add_boolean(bf_tree, hf_sna_rh_qri, tvb, offset, 1, rh_1);
 848         proto_tree_add_boolean(bf_tree, hf_sna_rh_pi, tvb,  offset, 1, rh_1);
 849
 850         offset += 1;
 851         rh_2 = tvb_get_guint8(tvb, offset);
 852
 853         /* Create the bitfield tree for byte 2*/
 854         bf_item = proto_tree_add_uint(tree, hf_sna_rh_2, tvb, offset, 1, rh_2);
 855
 856         if (!is_response) {
 857                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_2);
 858
 859                 proto_tree_add_boolean(bf_tree, hf_sna_rh_bbi, tvb,  offset, 1, rh_2);
 860                 proto_tree_add_boolean(bf_tree, hf_sna_rh_ebi, tvb,  offset, 1, rh_2);
 861                 proto_tree_add_boolean(bf_tree, hf_sna_rh_cdi, tvb,  offset, 1, rh_2);
 862                 proto_tree_add_uint(bf_tree, hf_sna_rh_csi, tvb,  offset, 1, rh_2);
 863                 proto_tree_add_boolean(bf_tree, hf_sna_rh_edi, tvb,  offset, 1, rh_2);
 864                 proto_tree_add_boolean(bf_tree, hf_sna_rh_pdi, tvb,  offset, 1, rh_2);
 865                 proto_tree_add_boolean(bf_tree, hf_sna_rh_cebi, tvb, offset, 1, rh_2);
 866         }
 867
 868         /* XXX - check for sdi. If TRUE, the next 4 bytes will be sense data */
 869 }
 870
 871 void
 872 proto_register_sna(void)
 873 {
 874         static hf_register_info hf[] = {
 875                 { &hf_sna_th,
 876                 { "Transmission Header",        "sna.th", FT_NONE, BASE_NONE, NULL, 0x0,
 877                         "", HFILL }},
 878
 879                 { &hf_sna_th_0,
 880                 { "Transmission Header Byte 0", "sna.th.0", FT_UINT8, BASE_HEX, NULL, 0x0,
 881                         "Byte 0 of Tranmission Header contains FID, MPF, ODAI,"
 882                         " and EFI as bitfields.", HFILL }},
 883
 884                 { &hf_sna_th_fid,
 885                 { "Format Identifer",           "sna.th.fid", FT_UINT8, BASE_HEX, VALS(sna_th_fid_vals), 0xf0,
 886                         "Format Identification", HFILL }},
 887
 888                 { &hf_sna_th_mpf,
 889                 { "Mapping Field",              "sna.th.mpf", FT_UINT8, BASE_DEC, VALS(sna_th_mpf_vals), 0x0c,
 890                         "The Mapping Field specifies whether the information field"
 891                         " associated with the TH is a complete or partial BIU.", HFILL }},
 892
 893                 { &hf_sna_th_odai,
 894                 { "ODAI Assignment Indicator",  "sna.th.odai", FT_UINT8, BASE_DEC, NULL, 0x02,
 895                         "The ODAI indicates which node assigned the OAF'-DAF' values"
 896                         " carried in the TH.", HFILL }},
 897
 898                 { &hf_sna_th_efi,
 899                 { "Expedited Flow Indicator",   "sna.th.efi", FT_UINT8, BASE_DEC, VALS(sna_th_efi_vals), 0x01,
 900                         "The EFI designates whether the PIU belongs to the normal"
 901                         " or expedited flow.", HFILL }},
 902
 903                 { &hf_sna_th_daf,
 904                 { "Destination Address Field",  "sna.th.daf", FT_UINT16, BASE_HEX, NULL, 0x0,
 905                         "", HFILL }},
 906
 907                 { &hf_sna_th_oaf,
 908                 { "Origin Address Field",       "sna.th.oaf", FT_UINT16, BASE_HEX, NULL, 0x0,
 909                         "", HFILL }},
 910
 911                 { &hf_sna_th_snf,
 912                 { "Sequence Number Field",      "sna.th.snf", FT_UINT16, BASE_DEC, NULL, 0x0,
 913                         "The Sequence Number Field contains a numerical identifier for"
 914                         " the associated BIU.", HFILL }},
 915
 916                 { &hf_sna_th_dcf,
 917                 { "Data Count Field",   "sna.th.dcf", FT_UINT16, BASE_DEC, NULL, 0x0,
 918                         "A binary count of the number of bytes in the BIU or BIU segment associated "
 919                         "with the tranmission header. The count does not include any of the bytes "
 920                         "in the transmission header.", HFILL }},
 921
 922                 { &hf_sna_th_lsid,
 923                 { "Local Session Identification",       "sna.th.lsid", FT_UINT8, BASE_HEX, NULL, 0x0,
 924                         "", HFILL }},
 925
 926                 { &hf_sna_th_tg_sweep,
 927                 { "Transmission Group Sweep",           "sna.th.tg_sweep", FT_UINT8, BASE_DEC,
 928                         VALS(sna_th_tg_sweep_vals), 0x08,
 929                         "", HFILL }},
 930
 931                 { &hf_sna_th_er_vr_supp_ind,
 932                 { "ER and VR Support Indicator",        "sna.th.er_vr_supp_ind", FT_UINT8, BASE_DEC,
 933                         VALS(sna_th_er_vr_supp_ind_vals), 0x04,
 934                         "", HFILL }},
 935
 936                 { &hf_sna_th_vr_pac_cnt_ind,
 937                 { "Virtual Route Pacing Count Indicator",       "sna.th.vr_pac_cnt_ind",
 938                         FT_UINT8, BASE_DEC, VALS(sna_th_vr_pac_cnt_ind_vals), 0x02,
 939                         "", HFILL }},
 940
 941                 { &hf_sna_th_ntwk_prty,
 942                 { "Network Priority",   "sna.th.ntwk_prty",
 943                         FT_UINT8, BASE_DEC, VALS(sna_th_ntwk_prty_vals), 0x01,
 944                         "", HFILL }},
 945
 946                 { &hf_sna_th_tgsf,
 947                 { "Transmission Group Segmenting Field",        "sna.th.tgsf",
 948                         FT_UINT8, BASE_HEX, VALS(sna_th_tgsf_vals), 0xc0,
 949                         "", HFILL }},
 950
 951                 { &hf_sna_th_mft,
 952                 { "MPR FID4 Type",      "sna.th.mft", FT_BOOLEAN, BASE_NONE, NULL, 0x04,
 953                         "", HFILL }},
 954
 955                 { &hf_sna_th_piubf,
 956                 { "PIU Blocking Field", "sna.th.piubf", FT_UINT8, BASE_HEX,
 957                         VALS(sna_th_piubf_vals), 0x03,
 958                         "Specifies whether this frame contains a single PIU or multiple PIUs.", HFILL }},
 959
 960                 { &hf_sna_th_iern,
 961                 { "Initial Explicit Route Number",      "sna.th.iern", FT_UINT8, BASE_DEC, NULL, 0xf0,
 962                         "", HFILL }},
 963
 964                 { &hf_sna_th_nlpoi,
 965                 { "NLP Offset Indicator",       "sna.th.nlpoi", FT_UINT8, BASE_DEC,
 966                         VALS(sna_th_nlpoi_vals), 0x80,
 967                         "", HFILL }},
 968
 969                 { &hf_sna_th_nlp_cp,
 970                 { "NLP Count or Padding",       "sna.th.nlp_cp", FT_UINT8, BASE_DEC, NULL, 0x70,
 971                         "", HFILL }},
 972
 973                 { &hf_sna_th_ern,
 974                 { "Explicit Route Number",      "sna.th.ern", FT_UINT8, BASE_DEC, NULL, 0x0f,
 975                         "The ERN in a TH identifies an explicit route direction of flow.", HFILL }},
 976
 977                 { &hf_sna_th_vrn,
 978                 { "Virtual Route Number",       "sna.th.vrn", FT_UINT8, BASE_DEC, NULL, 0xf0,
 979                         "", HFILL }},
 980
 981                 { &hf_sna_th_tpf,
 982                 { "Transmission Priority Field",        "sna.th.tpf", FT_UINT8, BASE_HEX,
 983                         VALS(sna_th_tpf_vals), 0x03,
 984                         "", HFILL }},
 985
 986                 { &hf_sna_th_vr_cwi,
 987                 { "Virtual Route Change Window Indicator",      "sna.th.vr_cwi", FT_UINT16, BASE_DEC,
 988                         VALS(sna_th_vr_cwi_vals), 0x8000,
 989                         "Used to change the window size of the virtual route by 1.", HFILL }},
 990
 991                 { &hf_sna_th_tg_nonfifo_ind,
 992                 { "Transmission Group Non-FIFO Indicator",      "sna.th.tg_nonfifo_ind", FT_BOOLEAN, 16,
 993                         TFS(&sna_th_tg_nonfifo_ind_truth), 0x4000,
 994                         "Indicates whether or not FIFO discipline is to enforced in "
 995                         "transmitting PIUs through the tranmission groups to prevent the PIUs "
 996                         "getting out of sequence during transmission over the TGs.", HFILL }},
 997
 998                 { &hf_sna_th_vr_sqti,
 999                 { "Virtual Route Sequence and Type Indicator",  "sna.th.vr_sqti", FT_UINT16, BASE_HEX,
1000                         VALS(sna_th_vr_sqti_vals), 0x3000,
1001                         "Specifies the PIU type.", HFILL }},
1002
1003                 { &hf_sna_th_tg_snf,
1004                 { "Transmission Group Sequence Number Field",   "sna.th.tg_snf", FT_UINT16, BASE_DEC,
1005                         NULL, 0x0fff,
1006                         "", HFILL }},
1007
1008                 { &hf_sna_th_vrprq,
1009                 { "Virtual Route Pacing Request",       "sna.th.vrprq", FT_BOOLEAN, 16,
1010                         TFS(&sna_th_vrprq_truth), 0x8000,
1011                         "", HFILL }},
1012
1013                 { &hf_sna_th_vrprs,
1014                 { "Virtual Route Pacing Response",      "sna.th.vrprs", FT_BOOLEAN, 16,
1015                         TFS(&sna_th_vrprs_truth), 0x4000,
1016                         "", HFILL }},
1017
1018                 { &hf_sna_th_vr_cwri,
1019                 { "Virtual Route Change Window Reply Indicator",        "sna.th.vr_cwri", FT_UINT16, BASE_DEC,
1020                         VALS(sna_th_vr_cwri_vals), 0x2000,
1021                         "Permits changing of the window size by 1 for PIUs received by the "
1022                         "sender of this bit.", HFILL }},
1023
1024                 { &hf_sna_th_vr_rwi,
1025                 { "Virtual Route Reset Window Indicator",       "sna.th.vr_rwi", FT_BOOLEAN, 16,
1026                         TFS(&sna_th_vr_rwi_truth), 0x1000,
1027                         "Indicates severe congestion in a node on the virtual route.", HFILL }},
1028
1029                 { &hf_sna_th_vr_snf_send,
1030                 { "Virtual Route Send Sequence Number Field",   "sna.th.vr_snf_send", FT_UINT16, BASE_DEC,
1031                         NULL, 0x0fff,
1032                         "", HFILL }},
1033
1034                 { &hf_sna_th_dsaf,
1035                 { "Destination Subarea Address Field",  "sna.th.dsaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1036                         "", HFILL }},
1037
1038                 { &hf_sna_th_osaf,
1039                 { "Origin Subarea Address Field",       "sna.th.osaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1040                         "", HFILL }},
1041
1042                 { &hf_sna_th_snai,
1043                 { "SNA Indicator",      "sna.th.snai", FT_BOOLEAN, 8, NULL, 0x10,
1044                         "Used to identify whether the PIU originated or is destined for "
1045                         "an SNA or non-SNA device.", HFILL }},
1046
1047                 { &hf_sna_th_def,
1048                 { "Destination Element Field",  "sna.th.def", FT_UINT16, BASE_HEX, NULL, 0x0,
1049                         "", HFILL }},
1050
1051                 { &hf_sna_th_oef,
1052                 { "Origin Element Field",       "sna.th.oef", FT_UINT16, BASE_HEX, NULL, 0x0,
1053                         "", HFILL }},
1054
1055                 { &hf_sna_th_sa,
1056                 { "Session Address",    "sna.th.sa", FT_BYTES, BASE_HEX, NULL, 0x0,
1057                         "", HFILL }},
1058
1059                 { &hf_sna_th_cmd_fmt,
1060                 { "Command Format",     "sna.th.cmd_fmt", FT_UINT8, BASE_HEX, NULL, 0x0,
1061                         "", HFILL }},
1062
1063                 { &hf_sna_th_cmd_type,
1064                 { "Command Type",       "sna.th.cmd_type", FT_UINT8, BASE_HEX, NULL, 0x0,
1065                         "", HFILL }},
1066
1067                 { &hf_sna_th_cmd_sn,
1068                 { "Command Sequence Number",    "sna.th.cmd_sn", FT_UINT16, BASE_DEC, NULL, 0x0,
1069                         "", HFILL }},
1070
1071
1072                 { &hf_sna_rh,
1073                 { "Request/Response Header",    "sna.rh", FT_NONE, BASE_NONE, NULL, 0x0,
1074                         "", HFILL }},
1075
1076                 { &hf_sna_rh_0,
1077                 { "Request/Response Header Byte 0",     "sna.rh.0", FT_UINT8, BASE_HEX, NULL, 0x0,
1078                         "", HFILL }},
1079
1080                 { &hf_sna_rh_1,
1081                 { "Request/Response Header Byte 1",     "sna.rh.1", FT_UINT8, BASE_HEX, NULL, 0x0,
1082                         "", HFILL }},
1083
1084                 { &hf_sna_rh_2,
1085                 { "Request/Response Header Byte 2",     "sna.rh.2", FT_UINT8, BASE_HEX, NULL, 0x0,
1086                         "", HFILL }},
1087
1088                 { &hf_sna_rh_rri,
1089                 { "Request/Response Indicator", "sna.rh.rri", FT_UINT8, BASE_DEC, VALS(sna_rh_rri_vals), 0x80,
1090                         "Denotes whether this is a request or a response.", HFILL }},
1091
1092                 { &hf_sna_rh_ru_category,
1093                 { "Request/Response Unit Category",     "sna.rh.ru_category", FT_UINT8, BASE_HEX,
1094                         VALS(sna_rh_ru_category_vals), 0x60,
1095                         "", HFILL }},
1096
1097                 { &hf_sna_rh_fi,
1098                 { "Format Indicator",           "sna.rh.fi", FT_BOOLEAN, 8, TFS(&sna_rh_fi_truth), 0x08,
1099                         "", HFILL }},
1100
1101                 { &hf_sna_rh_sdi,
1102                 { "Sense Data Included",        "sna.rh.sdi", FT_BOOLEAN, 8, TFS(&sna_rh_sdi_truth), 0x04,
1103                         "Indicates that a 4-byte sense data field is included in the associated RU.", HFILL }},
1104
1105                 { &hf_sna_rh_bci,
1106                 { "Begin Chain Indicator",      "sna.rh.bci", FT_BOOLEAN, 8, TFS(&sna_rh_bci_truth), 0x02,
1107                         "", HFILL }},
1108
1109                 { &hf_sna_rh_eci,
1110                 { "End Chain Indicator",        "sna.rh.eci", FT_BOOLEAN, 8, TFS(&sna_rh_eci_truth), 0x01,
1111                         "", HFILL }},
1112
1113                 { &hf_sna_rh_dr1,
1114                 { "Definite Response 1 Indicator",      "sna.rh.dr1", FT_BOOLEAN, 8, NULL, 0x80,
1115                         "", HFILL }},
1116
1117                 { &hf_sna_rh_lcci,
1118                 { "Length-Checked Compression Indicator",       "sna.rh.lcci", FT_BOOLEAN, 8,
1119                         TFS(&sna_rh_lcci_truth), 0x40,
1120                         "", HFILL }},
1121
1122                 { &hf_sna_rh_dr2,
1123                 { "Definite Response 2 Indicator",      "sna.rh.dr2", FT_BOOLEAN, 8, NULL, 0x20,
1124                         "", HFILL }},
1125
1126                 { &hf_sna_rh_eri,
1127                 { "Exception Response Indicator",       "sna.rh.eri", FT_BOOLEAN, 8, NULL, 0x10,
1128                         "Used in conjunction with DR1I and DR2I to indicate, in a request, "
1129                         "the form of response requested.", HFILL }},
1130
1131                 { &hf_sna_rh_rti,
1132                 { "Response Type Indicator",    "sna.rh.rti", FT_BOOLEAN, 8, TFS(&sna_rh_rti_truth), 0x10,
1133                         "", HFILL }},
1134
1135                 { &hf_sna_rh_rlwi,
1136                 { "Request Larger Window Indicator",    "sna.rh.rlwi", FT_BOOLEAN, 8, NULL, 0x04,
1137                         "Indicates whether a larger pacing window was requested.", HFILL }},
1138
1139                 { &hf_sna_rh_qri,
1140                 { "Queued Response Indicator",  "sna.rh.qri", FT_BOOLEAN, 8, TFS(&sna_rh_qri_truth), 0x02,
1141                         "", HFILL }},
1142
1143                 { &hf_sna_rh_pi,
1144                 { "Pacing Indicator",   "sna.rh.pi", FT_BOOLEAN, 8, NULL, 0x01,
1145                         "", HFILL }},
1146
1147                 { &hf_sna_rh_bbi,
1148                 { "Begin Bracket Indicator",    "sna.rh.bbi", FT_BOOLEAN, 8, NULL, 0x80,
1149                         "", HFILL }},
1150
1151                 { &hf_sna_rh_ebi,
1152                 { "End Bracket Indicator",      "sna.rh.ebi", FT_BOOLEAN, 8, NULL, 0x40,
1153                         "", HFILL }},
1154
1155                 { &hf_sna_rh_cdi,
1156                 { "Change Direction Indicator", "sna.rh.cdi", FT_BOOLEAN, 8, NULL, 0x20,
1157                         "", HFILL }},
1158
1159                 { &hf_sna_rh_csi,
1160                 { "Code Selection Indicator",   "sna.rh.csi", FT_UINT8, BASE_DEC, VALS(sna_rh_csi_vals), 0x08,
1161                         "Specifies the encoding used for the associated FMD RU.", HFILL }},
1162
1163                 { &hf_sna_rh_edi,
1164                 { "Enciphered Data Indicator",  "sna.rh.edi", FT_BOOLEAN, 8, NULL, 0x04,
1165                         "Indicates that information in the associated RU is enciphered under "
1166                         "session-level cryptography protocols.", HFILL }},
1167
1168                 { &hf_sna_rh_pdi,
1169                 { "Padded Data Indicator",      "sna.rh.pdi", FT_BOOLEAN, 8, NULL, 0x02,
1170                         "Indicates that the RU was padded at the end, before encipherment, to the next "
1171                         "integral multiple of 8 bytes.", HFILL }},
1172
1173                 { &hf_sna_rh_cebi,
1174                 { "Conditional End Bracket Indicator",  "sna.rh.cebi", FT_BOOLEAN, 8, NULL, 0x01,
1175                         "Used to indicate the beginning or end of a group of exchanged "
1176                         "requests and responses called a bracket. Only used on LU-LU sessions.", HFILL }},
1177
1178 /*                { &hf_sna_ru,
1179                 { "Request/Response Unit",      "sna.ru", FT_NONE, BASE_NONE, NULL, 0x0,
1180                         "", HFILL }},*/
1181         };
1182         static gint *ett[] = {
1183                 &ett_sna,
1184                 &ett_sna_th,
1185                 &ett_sna_th_fid,
1186                 &ett_sna_rh,
1187                 &ett_sna_rh_0,
1188                 &ett_sna_rh_1,
1189                 &ett_sna_rh_2,
1190         };
1191
1192         proto_sna = proto_register_protocol("Systems Network Architecture",
1193             "SNA", "sna");
1194         proto_register_field_array(proto_sna, hf, array_length(hf));
1195         proto_register_subtree_array(ett, array_length(ett));
1196         register_dissector("sna", dissect_sna, proto_sna);
1197 }
1198
1199 void
1200 proto_reg_handoff_sna(void)
1201 {
1202         dissector_handle_t sna_handle;
1203
1204         sna_handle = find_dissector("sna");
1205         dissector_add("llc.dsap", SAP_SNA_PATHCTRL, sna_handle);
1206         data_handle = find_dissector("data");
1207 }