packet-sna.c

   1 /* packet-sna.c
   2  * Routines for SNA
   3  * Gilbert Ramirez <gram@xiexie.org>
   4  *
   5  * $Id: packet-sna.c,v 1.9 1999/11/16 11:42:57 guy Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@unicom.net>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  25  */
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #ifdef HAVE_SYS_TYPES_H
  32 # include <sys/types.h>
  33 #endif
  34
  35 #include <glib.h>
  36 #include "packet.h"
  37 #include "packet-sna.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 /* Format Identifier */
 124 static const value_string sna_th_fid_vals[] = {
 125         { 0x0,  "SNA device <--> Non-SNA Device" },
 126         { 0x1,  "Subarea Nodes, without ER or VR" },
 127         { 0x2,  "Subarea Node <--> PU2" },
 128         { 0x3,  "Subarea Node or SNA host <--> Subarea Node" },
 129         { 0x4,  "Subarea Nodes, supporting ER and VR" },
 130         { 0x5,  "HPR RTP endpoint nodes" },
 131         { 0xf,  "Adjaced Subarea Nodes, supporting ER and VR" },
 132         { 0x0,  NULL }
 133 };
 134
 135 /* Mapping Field */
 136 static const value_string sna_th_mpf_vals[] = {
 137         { 0, "Middle segment of a BIU" },
 138         { 1, "Last segment of a BIU" },
 139         { 2, "First segment of a BIU" },
 140         { 3 , "Whole BIU" },
 141         { 0,   NULL }
 142 };
 143
 144 /* Expedited Flow Indicator */
 145 static const value_string sna_th_efi_vals[] = {
 146         { 0, "Normal Flow" },
 147         { 1, "Expedited Flow" }
 148 };
 149
 150 /* Request/Response Indicator */
 151 static const value_string sna_rh_rri_vals[] = {
 152         { 0, "Request" },
 153         { 1, "Response" }
 154 };
 155
 156 /* Request/Response Unit Category */
 157 static const value_string sna_rh_ru_category_vals[] = {
 158         { 0x00, "Function Management Data (FMD)" },
 159         { 0x01, "Network Control (NC)" },
 160         { 0x10, "Data Flow Control (DFC)" },
 161         { 0x11, "Session Control (SC)" },
 162 };
 163
 164 /* Format Indicator */
 165 static const true_false_string sna_rh_fi_truth =
 166         { "FM Header", "No FM Header" };
 167
 168 /* Sense Data Included */
 169 static const true_false_string sna_rh_sdi_truth =
 170         { "Included", "Not Included" };
 171
 172 /* Begin Chain Indicator */
 173 static const true_false_string sna_rh_bci_truth =
 174         { "First in Chain", "Not First in Chain" };
 175
 176 /* End Chain Indicator */
 177 static const true_false_string sna_rh_eci_truth =
 178         { "Last in Chain", "Not Last in Chain" };
 179
 180 /* Lengith-Checked Compression Indicator */
 181 static const true_false_string sna_rh_lcci_truth =
 182         { "Compressed", "Not Compressed" };
 183
 184 /* Response Type Indicator */
 185 static const true_false_string sna_rh_rti_truth =
 186         { "Negative", "Positive" };
 187
 188 /* Exception Response Indicator */
 189 static const true_false_string sna_rh_eri_truth =
 190         { "Exception", "Definite" };
 191
 192 /* Queued Response Indicator */
 193 static const true_false_string sna_rh_qri_truth =
 194         { "Enqueue response in TC queues", "Response bypasses TC queues" };
 195
 196 /* Code Selection Indicator */
 197 static const value_string sna_rh_csi_vals[] = {
 198         { 0, "EBCDIC" },
 199         { 1, "ASCII" }
 200 };
 201
 202 /* TG Sweep */
 203 static const value_string sna_th_tg_sweep_vals[] = {
 204         { 0, "This PIU may overtake any PU ahead of it." },
 205         { 1, "This PIU does not ovetake any PIU ahead of it." }
 206 };
 207
 208 /* ER_VR_SUPP_IND */
 209 static const value_string sna_th_er_vr_supp_ind_vals[] = {
 210         { 0, "Each node supports ER and VR protocols" },
 211         { 1, "Includes at least one node that does not support ER and VR protocols"  }
 212 };
 213
 214 /* VR_PAC_CNT_IND */
 215 static const value_string sna_th_vr_pac_cnt_ind_vals[] = {
 216         { 0, "Pacing count on the VR has not reached 0" },
 217         { 1, "Pacing count on the VR has reached 0" }
 218 };
 219
 220 /* NTWK_PRTY */
 221 static const value_string sna_th_ntwk_prty_vals[] = {
 222         { 0, "PIU flows at a lower priority" },
 223         { 1, "PIU flows at network priority (highest transmission priority)" }
 224 };
 225
 226 /* TGSF */
 227 static const value_string sna_th_tgsf_vals[] = {
 228         { 0x00, "Not segmented" },
 229         { 0x01, "Last segment" },
 230         { 0x10, "First segment" },
 231         { 0x11, "Middle segment" }
 232 };
 233
 234 /* PIUBF */
 235 static const value_string sna_th_piubf_vals[] = {
 236         { 0x00, "Single PIU frame" },
 237         { 0x01, "Last PIU of a multiple PIU frame" },
 238         { 0x10, "First PIU of a multiple PIU frame" },
 239         { 0x11, "Middle PIU of a multiple PIU frame" }
 240 };
 241
 242 /* NLPOI */
 243 static const value_string sna_th_nlpoi_vals[] = {
 244         { 0x0, "NLP starts within this FID4 TH" },
 245         { 0x1, "NLP byte 0 starts after RH byte 0 following NLP C/P pad" },
 246 };
 247
 248 /* TPF */
 249 static const value_string sna_th_tpf_vals[] = {
 250         { 0x00, "Low Priority" },
 251         { 0x01, "Medium Priority" },
 252         { 0x10, "High Priority" },
 253 };
 254
 255 /* VR_CWI */
 256 static const value_string sna_th_vr_cwi_vals[] = {
 257         { 0x0, "Increment window size" },
 258         { 0x1, "Decrement window size" },
 259 };
 260
 261 /* TG_NONFIFO_IND */
 262 static const true_false_string sna_th_tg_nonfifo_ind_truth =
 263         { "TG FIFO is not required", "TG FIFO is required" };
 264
 265 /* VR_SQTI */
 266 static const value_string sna_th_vr_sqti_vals[] = {
 267         { 0x00, "Non-sequenced, Non-supervisory" },
 268         { 0x01, "Non-sequenced, Supervisory" },
 269         { 0x10, "Singly-sequenced" },
 270 };
 271
 272 /* VRPRQ */
 273 static const true_false_string sna_th_vrprq_truth = {
 274         "VR pacing request is sent asking for a VR pacing response",
 275         "No VR pacing response is requested",
 276 };
 277
 278 /* VRPRS */
 279 static const true_false_string sna_th_vrprs_truth = {
 280         "VR pacing response is sent in response to a VRPRQ bit set",
 281         "No pacing response sent",
 282 };
 283
 284 /* VR_CWRI */
 285 static const value_string sna_th_vr_cwri_vals[] = {
 286         { 0, "Increment window size by 1" },
 287         { 1, "Decrement window size by 1" },
 288 };
 289
 290 /* VR_RWI */
 291 static const true_false_string sna_th_vr_rwi_truth = {
 292         "Reset window size to the minimum specified in NC_ACTVR",
 293         "Do not reset window size",
 294 };
 295
 296 static int  dissect_fid0_1 (const u_char*, int, frame_data*, proto_tree*);
 297 static int  dissect_fid2 (const u_char*, int, frame_data*, proto_tree*);
 298 static int  dissect_fid3 (const u_char*, int, frame_data*, proto_tree*);
 299 static int  dissect_fid4 (const u_char*, int, frame_data*, proto_tree*);
 300 static int  dissect_fid5 (const u_char*, int, frame_data*, proto_tree*);
 301 static int  dissect_fidf (const u_char*, int, frame_data*, proto_tree*);
 302 static void dissect_rh (const u_char*, int, frame_data*, proto_tree*);
 303
 304 void
 305 dissect_sna(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 306
 307         proto_tree      *sna_tree = NULL, *th_tree = NULL, *rh_tree = NULL;
 308         proto_item      *sna_ti = NULL, *th_ti = NULL, *rh_ti = NULL;
 309         guint8          th_fid;
 310         int             sna_header_len = 0, th_header_len = 0;
 311
 312         if (IS_DATA_IN_FRAME(offset)) {
 313                 /* Transmission Header Format Identifier */
 314                 th_fid = hi_nibble(pd[offset]);
 315         }
 316         else {
 317                 /* If our first byte isn't here, stop dissecting */
 318                 return;
 319         }
 320
 321         /* Summary information */
 322         if (check_col(fd, COL_PROTOCOL))
 323                 col_add_str(fd, COL_PROTOCOL, "SNA");
 324         if (check_col(fd, COL_INFO))
 325                 col_add_str(fd, COL_INFO, val_to_str(th_fid, sna_th_fid_vals, "Unknown FID: %01x"));
 326
 327         if (tree) {
 328
 329                 /* Don't bother setting length. We'll set it later after we find
 330                  * the lengths of TH/RH/RU */
 331                 sna_ti = proto_tree_add_item(tree, proto_sna, offset, 0, NULL);
 332                 sna_tree = proto_item_add_subtree(sna_ti, ett_sna);
 333
 334                 /* --- TH --- */
 335                 /* Don't bother setting length. We'll set it later after we find
 336                  * the length of TH */
 337                 th_ti = proto_tree_add_item(sna_tree, hf_sna_th,  offset, 0, NULL);
 338                 th_tree = proto_item_add_subtree(th_ti, ett_sna_th);
 339         }
 340
 341         /* Get size of TH */
 342         switch(th_fid) {
 343                 case 0x0:
 344                 case 0x1:
 345                         th_header_len = dissect_fid0_1(pd, offset, fd, th_tree);
 346                         break;
 347                 case 0x2:
 348                         th_header_len = dissect_fid2(pd, offset, fd, th_tree);
 349                         break;
 350                 case 0x3:
 351                         th_header_len = dissect_fid3(pd, offset, fd, th_tree);
 352                         break;
 353                 case 0x4:
 354                         th_header_len = dissect_fid4(pd, offset, fd, th_tree);
 355                         break;
 356                 case 0x5:
 357                         th_header_len = dissect_fid5(pd, offset, fd, th_tree);
 358                         break;
 359                 case 0xf:
 360                         th_header_len = dissect_fidf(pd, offset, fd, th_tree);
 361                         break;
 362                 default:
 363                         dissect_data(pd, offset+1, fd, tree);
 364         }
 365
 366         sna_header_len += th_header_len;
 367         offset += th_header_len;
 368
 369         if (tree) {
 370                 proto_item_set_len(th_ti, th_header_len);
 371
 372                 /* --- RH --- */
 373                 if (BYTES_ARE_IN_FRAME(offset, 3)) {
 374                         rh_ti = proto_tree_add_item(sna_tree, hf_sna_rh, offset, 3, NULL);
 375                         rh_tree = proto_item_add_subtree(rh_ti, ett_sna_rh);
 376                         dissect_rh(pd, offset, fd, rh_tree);
 377                         sna_header_len += 3;
 378                         offset += 3;
 379                 }
 380                 else {
 381                         /* If our first byte isn't here, stop dissecting */
 382                         return;
 383                 }
 384
 385                 proto_item_set_len(sna_ti, sna_header_len);
 386         }
 387         else {
 388                 if (BYTES_ARE_IN_FRAME(offset, 3)) {
 389                         sna_header_len += 3;
 390                         offset += 3;
 391                 }
 392
 393         }
 394
 395         if (IS_DATA_IN_FRAME(offset+1)) {
 396                 dissect_data(pd, offset, fd, tree);
 397         }
 398 }
 399
 400 /* FID Types 0 and 1 */
 401 static int
 402 dissect_fid0_1 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 403
 404         proto_tree      *bf_tree;
 405         proto_item      *bf_item;
 406         guint8          th_0;
 407         guint16         daf, oaf, snf, dcf;
 408
 409         static int bytes_in_header = 10;
 410
 411         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 412                 return 0;
 413         }
 414
 415         th_0 = pd[offset+0];
 416         daf = pntohs(&pd[offset+2]);
 417         oaf = pntohs(&pd[offset+4]);
 418         snf = pntohs(&pd[offset+6]);
 419         dcf = pntohs(&pd[offset+8]);
 420
 421         SET_ADDRESS(&pi.net_src, AT_SNA, 2, &pd[offset+4]);
 422         SET_ADDRESS(&pi.src, AT_SNA, 2, &pd[offset+4]);
 423         SET_ADDRESS(&pi.net_dst, AT_SNA, 2, &pd[offset+2]);
 424         SET_ADDRESS(&pi.dst, AT_SNA, 2, &pd[offset+2]);
 425
 426         if (!tree) {
 427                 return bytes_in_header;
 428         }
 429
 430         /* Create the bitfield tree */
 431         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
 432         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 433
 434         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
 435         proto_tree_add_item(bf_tree, hf_sna_th_mpf, offset, 1, th_0);
 436         proto_tree_add_item(bf_tree, hf_sna_th_efi ,offset, 1, th_0);
 437
 438         proto_tree_add_text(tree, offset+1, 1, "Reserved");
 439         proto_tree_add_item(tree, hf_sna_th_daf ,offset+2, 1, daf);
 440         proto_tree_add_item(tree, hf_sna_th_oaf ,offset+4, 1, oaf);
 441         proto_tree_add_item(tree, hf_sna_th_snf ,offset+6, 2, snf);
 442         proto_tree_add_item(tree, hf_sna_th_dcf ,offset+8, 2, dcf);
 443
 444         return bytes_in_header;
 445
 446 }
 447
 448
 449 /* FID Type 2 */
 450 static int
 451 dissect_fid2 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 452
 453         proto_tree      *bf_tree;
 454         proto_item      *bf_item;
 455         guint8          th_0, daf, oaf;
 456         guint16         snf;
 457
 458         static int bytes_in_header = 6;
 459
 460         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 461                 return 0;
 462         }
 463
 464         th_0 = pd[offset+0];
 465         daf = pd[offset+2];
 466         oaf = pd[offset+3];
 467
 468         /* Addresses in FID 2 are FT_UINT8 */
 469         SET_ADDRESS(&pi.net_src, AT_SNA, 1, &pd[offset+3]);
 470         SET_ADDRESS(&pi.src, AT_SNA, 1, &pd[offset+3]);
 471         SET_ADDRESS(&pi.net_dst, AT_SNA, 1, &pd[offset+2]);
 472         SET_ADDRESS(&pi.dst, AT_SNA, 1, &pd[offset+2]);
 473
 474         if (!tree) {
 475                 return bytes_in_header;
 476         }
 477
 478         snf = pntohs(&pd[offset+4]);
 479
 480         /* Create the bitfield tree */
 481         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
 482         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 483
 484         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
 485         proto_tree_add_item(bf_tree, hf_sna_th_mpf, offset, 1, th_0);
 486         proto_tree_add_item(bf_tree, hf_sna_th_odai ,offset, 1, th_0);
 487         proto_tree_add_item(bf_tree, hf_sna_th_efi ,offset, 1, th_0);
 488
 489         /* Addresses in FID 2 are FT_UINT8 */
 490         proto_tree_add_text(tree, offset+1, 1, "Reserved");
 491         proto_tree_add_item_format(tree, hf_sna_th_daf ,offset+2, 1, daf,
 492                         "Destination Address Field: 0x%02x", daf);
 493         proto_tree_add_item_format(tree, hf_sna_th_oaf ,offset+3, 1, oaf,
 494                         "Origin Address Field: 0x%02x", oaf);
 495         proto_tree_add_item(tree, hf_sna_th_snf ,offset+4, 2, snf);
 496
 497         return bytes_in_header;
 498 }
 499
 500 /* FID Type 3 */
 501 static int
 502 dissect_fid3 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 503
 504         proto_tree      *bf_tree;
 505         proto_item      *bf_item;
 506         guint8          th_0;
 507         guint8          lsid;
 508
 509         static int bytes_in_header = 2;
 510
 511         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 512                 return 0;
 513         }
 514
 515         if (!tree) {
 516                 return bytes_in_header;
 517         }
 518
 519         th_0 = pd[offset+0];
 520         lsid = pd[offset+1];
 521
 522         /* Create the bitfield tree */
 523         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
 524         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 525
 526         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
 527         proto_tree_add_item(bf_tree, hf_sna_th_mpf, offset, 1, th_0);
 528         proto_tree_add_item(bf_tree, hf_sna_th_efi ,offset, 1, th_0);
 529
 530         proto_tree_add_item(tree, hf_sna_th_lsid ,offset+1, 1, lsid);
 531
 532         return bytes_in_header;
 533 }
 534
 535 /* FID Type 4 */
 536
 537 gchar *
 538 sna_fid_type_4_addr_to_str(const struct sna_fid_type_4_addr *addrp)
 539 {
 540   static gchar  str[3][14];
 541   static gchar  *cur;
 542
 543   if (cur == &str[0][0]) {
 544     cur = &str[1][0];
 545   } else if (cur == &str[1][0]) {
 546     cur = &str[2][0];
 547   } else {
 548     cur = &str[0][0];
 549   }
 550
 551   sprintf(cur, "%08X.%04X", addrp->saf, addrp->ef);
 552   return cur;
 553 }
 554
 555 static int
 556 dissect_fid4 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 557
 558         proto_tree      *bf_tree;
 559         proto_item      *bf_item;
 560         guint8          th_byte, mft;
 561         guint16         th_word;
 562         guint16         def, oef, snf, dcf;
 563         guint32         dsaf, osaf;
 564         static struct sna_fid_type_4_addr src, dst;
 565
 566         static int bytes_in_header = 26;
 567
 568         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 569                 return 0;
 570         }
 571
 572         dsaf = pntohl(&pd[offset+8]);
 573         osaf = pntohl(&pd[offset+12]);
 574         def = pntohs(&pd[offset+18]);
 575         oef = pntohs(&pd[offset+20]);
 576         snf = pntohs(&pd[offset+22]);
 577         dcf = pntohs(&pd[offset+24]);
 578
 579         /* Addresses in FID 4 are discontiguous, sigh */
 580         src.saf = osaf;
 581         src.ef = oef;
 582         dst.saf = dsaf;
 583         dst.ef = def;
 584         SET_ADDRESS(&pi.net_src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 585             (guint8 *)&src);
 586         SET_ADDRESS(&pi.src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 587             (guint8 *)&src);
 588         SET_ADDRESS(&pi.net_dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 589             (guint8 *)&dst);
 590         SET_ADDRESS(&pi.dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 591             (guint8 *)&dst);
 592
 593         if (!tree) {
 594                 return bytes_in_header;
 595         }
 596
 597         th_byte = pd[offset];
 598
 599         /* Create the bitfield tree */
 600         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_byte);
 601         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 602
 603         /* Byte 0 */
 604         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_byte);
 605         proto_tree_add_item(bf_tree, hf_sna_th_tg_sweep, offset, 1, th_byte);
 606         proto_tree_add_item(bf_tree, hf_sna_th_er_vr_supp_ind, offset, 1, th_byte);
 607         proto_tree_add_item(bf_tree, hf_sna_th_vr_pac_cnt_ind, offset, 1, th_byte);
 608         proto_tree_add_item(bf_tree, hf_sna_th_ntwk_prty, offset, 1, th_byte);
 609
 610         offset += 1;
 611         th_byte = pd[offset];
 612
 613         /* Create the bitfield tree */
 614         bf_item = proto_tree_add_text(tree, offset, 1, "Transmision Header Byte 1");
 615         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 616
 617         /* Byte 1 */
 618         proto_tree_add_item(bf_tree, hf_sna_th_tgsf, offset, 1, th_byte);
 619         proto_tree_add_item(bf_tree, hf_sna_th_mft, offset, 1, th_byte);
 620         proto_tree_add_item(bf_tree, hf_sna_th_piubf, offset, 1, th_byte);
 621
 622         mft = th_byte & 0x04;
 623         offset += 1;
 624         th_byte = pd[offset];
 625
 626         /* Create the bitfield tree */
 627         bf_item = proto_tree_add_text(tree, offset, 1, "Transmision Header Byte 2");
 628         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 629
 630         /* Byte 2 */
 631         if (mft) {
 632                 proto_tree_add_item(bf_tree, hf_sna_th_nlpoi, offset, 1, th_byte);
 633                 proto_tree_add_item(bf_tree, hf_sna_th_nlp_cp, offset, 1, th_byte);
 634         }
 635         else {
 636                 proto_tree_add_item(bf_tree, hf_sna_th_iern, offset, 1, th_byte);
 637         }
 638         proto_tree_add_item(bf_tree, hf_sna_th_ern, offset, 1, th_byte);
 639
 640         offset += 1;
 641         th_byte = pd[offset];
 642
 643         /* Create the bitfield tree */
 644         bf_item = proto_tree_add_text(tree, offset, 1, "Transmision Header Byte 3");
 645         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 646
 647         /* Byte 3 */
 648         proto_tree_add_item(bf_tree, hf_sna_th_vrn, offset, 1, th_byte);
 649         proto_tree_add_item(bf_tree, hf_sna_th_tpf, offset, 1, th_byte);
 650
 651         offset += 1;
 652         th_word = pntohs(&pd[offset]);
 653
 654         /* Create the bitfield tree */
 655         bf_item = proto_tree_add_text(tree, offset, 2, "Transmision Header Bytes 4-5");
 656         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 657
 658         /* Bytes 4-5 */
 659         proto_tree_add_item(bf_tree, hf_sna_th_vr_cwi, offset, 2, th_word);
 660         proto_tree_add_item(bf_tree, hf_sna_th_tg_nonfifo_ind, offset, 2, th_word);
 661         proto_tree_add_item(bf_tree, hf_sna_th_vr_sqti, offset, 2, th_word);
 662
 663         /* I'm not sure about byte-order on this one... */
 664         proto_tree_add_item(bf_tree, hf_sna_th_tg_snf, offset, 2, th_word);
 665
 666         offset += 2;
 667         th_word = pntohs(&pd[offset]);
 668
 669         /* Create the bitfield tree */
 670         bf_item = proto_tree_add_text(tree, offset, 2, "Transmision Header Bytes 6-7");
 671         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 672
 673         /* Bytes 6-7 */
 674         proto_tree_add_item(bf_tree, hf_sna_th_vrprq, offset, 2, th_word);
 675         proto_tree_add_item(bf_tree, hf_sna_th_vrprs, offset, 2, th_word);
 676         proto_tree_add_item(bf_tree, hf_sna_th_vr_cwri, offset, 2, th_word);
 677         proto_tree_add_item(bf_tree, hf_sna_th_vr_rwi, offset, 2, th_word);
 678
 679         /* I'm not sure about byte-order on this one... */
 680         proto_tree_add_item(bf_tree, hf_sna_th_vr_snf_send, offset, 2, th_word);
 681
 682         offset += 2;
 683
 684         /* Bytes 8-11 */
 685         proto_tree_add_item(tree, hf_sna_th_dsaf, offset, 4, dsaf);
 686
 687         offset += 4;
 688
 689         /* Bytes 12-15 */
 690         proto_tree_add_item(tree, hf_sna_th_osaf, offset, 4, osaf);
 691
 692         offset += 4;
 693         th_byte = pd[offset];
 694
 695         /* Create the bitfield tree */
 696         bf_item = proto_tree_add_text(tree, offset, 2, "Transmision Header Byte 16");
 697         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 698
 699         /* Byte 16 */
 700         proto_tree_add_item(tree, hf_sna_th_snai, offset, 1, th_byte);
 701
 702         /* We luck out here because in their infinite wisdom the SNA
 703          * architects placed the MPF and EFI fields in the same bitfield
 704          * locations, even though for FID4 they're not in byte 0.
 705          * Thank you IBM! */
 706         proto_tree_add_item(tree, hf_sna_th_mpf, offset, 1, th_byte);
 707         proto_tree_add_item(tree, hf_sna_th_efi, offset, 1, th_byte);
 708
 709         offset += 2; /* 1 for byte 16, 1 for byte 17 which is reserved */
 710
 711         /* Bytes 18-25 */
 712         proto_tree_add_item(tree, hf_sna_th_def, offset+0, 2, def);
 713         proto_tree_add_item(tree, hf_sna_th_oef, offset+2, 2, oef);
 714         proto_tree_add_item(tree, hf_sna_th_snf, offset+4, 2, snf);
 715         proto_tree_add_item(tree, hf_sna_th_snf, offset+6, 2, dcf);
 716
 717         return bytes_in_header;
 718 }
 719
 720 /* FID Type 5 */
 721 static int
 722 dissect_fid5 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 723
 724         proto_tree      *bf_tree;
 725         proto_item      *bf_item;
 726         guint8          th_0;
 727         guint16         snf;
 728
 729         static int bytes_in_header = 12;
 730
 731         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 732                 return 0;
 733         }
 734
 735         th_0 = pd[offset+0];
 736         snf = pntohs(&pd[offset+2]);
 737
 738         if (!tree) {
 739                 return bytes_in_header;
 740         }
 741
 742         /* Create the bitfield tree */
 743         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
 744         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 745
 746         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
 747         proto_tree_add_item(bf_tree, hf_sna_th_mpf, offset, 1, th_0);
 748         proto_tree_add_item(bf_tree, hf_sna_th_efi, offset, 1, th_0);
 749
 750         proto_tree_add_text(tree, offset+1, 1, "Reserved");
 751         proto_tree_add_item(tree, hf_sna_th_snf, offset+2, 2, snf);
 752
 753         proto_tree_add_item(tree, hf_sna_th_sa, offset+4, 8, &pd[offset+4]);
 754
 755         return bytes_in_header;
 756
 757 }
 758
 759 /* FID Type f */
 760 static int
 761 dissect_fidf (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 762
 763         proto_tree      *bf_tree;
 764         proto_item      *bf_item;
 765         guint8          th_0, cmd_fmt, cmd_type;
 766         guint16         cmd_sn, dcf;
 767
 768         static int bytes_in_header = 26;
 769
 770         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 771                 return 0;
 772         }
 773
 774         th_0 = pd[offset+0];
 775         cmd_fmt = pd[offset+2];
 776         cmd_type = pd[offset+3];
 777         cmd_sn = pntohs(&pd[offset+4]);
 778
 779         /* Yup, bytes 6-23 are reserved! */
 780         dcf = pntohs(&pd[offset+24]);
 781
 782         if (!tree) {
 783                 return bytes_in_header;
 784         }
 785
 786         /* Create the bitfield tree */
 787         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
 788         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 789
 790         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
 791         proto_tree_add_text(tree, offset+1, 1, "Reserved");
 792
 793         proto_tree_add_item(tree, hf_sna_th_cmd_fmt,  offset+2, 1, cmd_fmt);
 794         proto_tree_add_item(tree, hf_sna_th_cmd_type, offset+3, 1, cmd_type);
 795         proto_tree_add_item(tree, hf_sna_th_cmd_sn,   offset+4, 2, cmd_sn);
 796
 797         proto_tree_add_text(tree, offset+6, 18, "Reserved");
 798
 799         proto_tree_add_item(tree, hf_sna_th_dcf, offset+24, 8, dcf);
 800
 801         return bytes_in_header;
 802 }
 803
 804
 805 /* RH */
 806 static void
 807 dissect_rh (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 808
 809         proto_tree      *bf_tree;
 810         proto_item      *bf_item;
 811         gboolean        is_response;
 812         guint8          rh_0, rh_1, rh_2;
 813
 814         rh_0 = pd[offset+0];
 815         rh_1 = pd[offset+1];
 816         rh_2 = pd[offset+2];
 817
 818         is_response = (rh_0 & 0x80);
 819
 820         /* Create the bitfield tree for byte 0*/
 821         bf_item = proto_tree_add_item(tree, hf_sna_rh_0, offset, 1, rh_0);
 822         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_0);
 823
 824         proto_tree_add_item(bf_tree, hf_sna_rh_rri, offset, 1, rh_0);
 825         proto_tree_add_item(bf_tree, hf_sna_rh_ru_category, offset, 1, rh_0);
 826         proto_tree_add_item(bf_tree, hf_sna_rh_fi, offset, 1, rh_0);
 827         proto_tree_add_item(bf_tree, hf_sna_rh_sdi, offset, 1, rh_0);
 828         proto_tree_add_item(bf_tree, hf_sna_rh_bci, offset, 1, rh_0);
 829         proto_tree_add_item(bf_tree, hf_sna_rh_eci, offset, 1, rh_0);
 830
 831         offset += 1;
 832
 833         /* Create the bitfield tree for byte 1*/
 834         bf_item = proto_tree_add_item(tree, hf_sna_rh_1, offset, 1, rh_1);
 835         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_1);
 836
 837         proto_tree_add_item(bf_tree, hf_sna_rh_dr1,  offset, 1, rh_1);
 838
 839         if (!is_response) {
 840                 proto_tree_add_item(bf_tree, hf_sna_rh_lcci, offset, 1, rh_1);
 841         }
 842
 843         proto_tree_add_item(bf_tree, hf_sna_rh_dr2,  offset, 1, rh_1);
 844
 845         if (is_response) {
 846                 proto_tree_add_item(bf_tree, hf_sna_rh_rti,  offset, 1, rh_1);
 847         }
 848         else {
 849                 proto_tree_add_item(bf_tree, hf_sna_rh_eri,  offset, 1, rh_1);
 850                 proto_tree_add_item(bf_tree, hf_sna_rh_rlwi, offset, 1, rh_1);
 851         }
 852
 853         proto_tree_add_item(bf_tree, hf_sna_rh_qri, offset, 1, rh_1);
 854         proto_tree_add_item(bf_tree, hf_sna_rh_pi,  offset, 1, rh_1);
 855
 856         offset += 1;
 857
 858         /* Create the bitfield tree for byte 2*/
 859         bf_item = proto_tree_add_item(tree, hf_sna_rh_2, offset, 1, rh_2);
 860
 861         if (!is_response) {
 862                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_2);
 863
 864                 proto_tree_add_item(bf_tree, hf_sna_rh_bbi,  offset, 1, rh_2);
 865                 proto_tree_add_item(bf_tree, hf_sna_rh_ebi,  offset, 1, rh_2);
 866                 proto_tree_add_item(bf_tree, hf_sna_rh_cdi,  offset, 1, rh_2);
 867                 proto_tree_add_item(bf_tree, hf_sna_rh_csi,  offset, 1, rh_2);
 868                 proto_tree_add_item(bf_tree, hf_sna_rh_edi,  offset, 1, rh_2);
 869                 proto_tree_add_item(bf_tree, hf_sna_rh_pdi,  offset, 1, rh_2);
 870                 proto_tree_add_item(bf_tree, hf_sna_rh_cebi, offset, 1, rh_2);
 871         }
 872
 873         /* XXX - check for sdi. If TRUE, the next 4 bytes will be sense data */
 874 }
 875
 876 void
 877 proto_register_sna(void)
 878 {
 879         static hf_register_info hf[] = {
 880                 { &hf_sna_th,
 881                 { "Transmission Header",        "sna.th", FT_NONE, BASE_NONE, NULL, 0x0,
 882                         "" }},
 883
 884                 { &hf_sna_th_0,
 885                 { "Transmission Header Byte 0", "sna.th.0", FT_UINT8, BASE_HEX, NULL, 0x0,
 886                         "Byte 0 of Tranmission Header contains FID, MPF, ODAI,"
 887                         " and EFI as bitfields." }},
 888
 889                 { &hf_sna_th_fid,
 890                 { "Format Identifer",           "sna.th.fid", FT_UINT8, BASE_HEX, VALS(sna_th_fid_vals), 0xf0,
 891                         "Format Identification" }},
 892
 893                 { &hf_sna_th_mpf,
 894                 { "Mapping Field",              "sna.th.mpf", FT_UINT8, BASE_NONE, VALS(sna_th_mpf_vals), 0x0c,
 895                         "The Mapping Field specifies whether the information field"
 896                         " associated with the TH is a complete or partial BIU." }},
 897
 898                 { &hf_sna_th_odai,
 899                 { "ODAI Assignment Indicator",  "sna.th.odai", FT_UINT8, BASE_DEC, NULL, 0x02,
 900                         "The ODAI indicates which node assigned the OAF'-DAF' values"
 901                         " carried in the TH." }},
 902
 903                 { &hf_sna_th_efi,
 904                 { "Expedited Flow Indicator",   "sna.th.efi", FT_UINT8, BASE_DEC, VALS(sna_th_efi_vals), 0x01,
 905                         "The EFI designates whether the PIU belongs to the normal"
 906                         " or expedited flow." }},
 907
 908                 { &hf_sna_th_daf,
 909                 { "Destination Address Field",  "sna.th.daf", FT_UINT16, BASE_HEX, NULL, 0x0,
 910                         "" }},
 911
 912                 { &hf_sna_th_oaf,
 913                 { "Origin Address Field",       "sna.th.oaf", FT_UINT16, BASE_HEX, NULL, 0x0,
 914                         "" }},
 915
 916                 { &hf_sna_th_snf,
 917                 { "Sequence Number Field",      "sna.th.snf", FT_UINT16, BASE_NONE, NULL, 0x0,
 918                         "The Sequence Number Field contains a numerical identifier for"
 919                         " the associated BIU."}},
 920
 921                 { &hf_sna_th_dcf,
 922                 { "Data Count Field",   "sna.th.dcf", FT_UINT16, BASE_DEC, NULL, 0x0,
 923                         "A binary count of the number of bytes in the BIU or BIU segment associated "
 924                         "with the tranmission header. The count does not include any of the bytes "
 925                         "in the transmission header."}},
 926
 927                 { &hf_sna_th_lsid,
 928                 { "Local Session Identification",       "sna.th.lsid", FT_UINT8, BASE_HEX, NULL, 0x0,
 929                         "" }},
 930
 931                 { &hf_sna_th_tg_sweep,
 932                 { "Transmission Group Sweep",           "sna.th.tg_sweep", FT_UINT8, BASE_DEC,
 933                         VALS(sna_th_tg_sweep_vals), 0x08,
 934                         "" }},
 935
 936                 { &hf_sna_th_er_vr_supp_ind,
 937                 { "ER and VR Support Indicator",        "sna.th.er_vr_supp_ind", FT_UINT8, BASE_DEC,
 938                         VALS(sna_th_er_vr_supp_ind_vals), 0x04,
 939                         "" }},
 940
 941                 { &hf_sna_th_vr_pac_cnt_ind,
 942                 { "Virtual Route Pacing Count Indicator",       "sna.th.vr_pac_cnt_ind",
 943                         FT_UINT8, BASE_DEC, VALS(sna_th_vr_pac_cnt_ind_vals), 0x02,
 944                         "" }},
 945
 946                 { &hf_sna_th_ntwk_prty,
 947                 { "Network Priority",   "sna.th.ntwk_prty",
 948                         FT_UINT8, BASE_DEC, VALS(sna_th_ntwk_prty_vals), 0x01,
 949                         "" }},
 950
 951                 { &hf_sna_th_tgsf,
 952                 { "Transmission Group Segmenting Field",        "sna.th.tgsf",
 953                         FT_UINT8, BASE_HEX, VALS(sna_th_tgsf_vals), 0xc0,
 954                         "" }},
 955
 956                 { &hf_sna_th_mft,
 957                 { "MPR FID4 Type",      "sna.th.mft", FT_BOOLEAN, BASE_NONE, NULL, 0x04,
 958                         "" }},
 959
 960                 { &hf_sna_th_piubf,
 961                 { "PIU Blocking Field", "sna.th.piubf", FT_UINT8, BASE_HEX,
 962                         VALS(sna_th_piubf_vals), 0x03,
 963                         "Specifies whether this frame contains a single PIU or multiple PIUs." }},
 964
 965                 { &hf_sna_th_iern,
 966                 { "Initial Explicit Route Number",      "sna.th.iern", FT_UINT8, BASE_DEC, NULL, 0xf0,
 967                         "" }},
 968
 969                 { &hf_sna_th_nlpoi,
 970                 { "NLP Offset Indicator",       "sna.th.nlpoi", FT_UINT8, BASE_DEC,
 971                         VALS(sna_th_nlpoi_vals), 0x80,
 972                         "" }},
 973
 974                 { &hf_sna_th_nlp_cp,
 975                 { "NLP Count or Padding",       "sna.th.nlp_cp", FT_UINT8, BASE_DEC, NULL, 0x70,
 976                         "" }},
 977
 978                 { &hf_sna_th_ern,
 979                 { "Explicit Route Number",      "sna.th.ern", FT_UINT8, BASE_DEC, NULL, 0x0f,
 980                         "The ERN in a TH identifies an explicit route direction of flow." }},
 981
 982                 { &hf_sna_th_vrn,
 983                 { "Virtual Route Number",       "sna.th.vrn", FT_UINT8, BASE_DEC, NULL, 0xf0,
 984                         "" }},
 985
 986                 { &hf_sna_th_tpf,
 987                 { "Transmission Priority Field",        "sna.th.tpf", FT_UINT8, BASE_HEX,
 988                         VALS(sna_th_tpf_vals), 0x03,
 989                         "" }},
 990
 991                 { &hf_sna_th_vr_cwi,
 992                 { "Virtual Route Change Window Indicator",      "sna.th.vr_cwi", FT_UINT16, BASE_DEC,
 993                         VALS(sna_th_vr_cwi_vals), 0x8000,
 994                         "Used to change the window size of the virtual route by 1." }},
 995
 996                 { &hf_sna_th_tg_nonfifo_ind,
 997                 { "Transmission Group Non-FIFO Indicator",      "sna.th.tg_nonfifo_ind", FT_BOOLEAN, 16,
 998                         TFS(&sna_th_tg_nonfifo_ind_truth), 0x4000,
 999                         "Indicates whether or not FIFO discipline is to enforced in "
1000                         "transmitting PIUs through the tranmission groups to prevent the PIUs "
1001                         "getting out of sequence during transmission over the TGs." }},
1002
1003                 { &hf_sna_th_vr_sqti,
1004                 { "Virtual Route Sequence and Type Indicator",  "sna.th.vr_sqti", FT_UINT16, BASE_HEX,
1005                         VALS(sna_th_vr_sqti_vals), 0x3000,
1006                         "Specifies the PIU type." }},
1007
1008                 { &hf_sna_th_tg_snf,
1009                 { "Transmission Group Sequence Number Field",   "sna.th.tg_snf", FT_UINT16, BASE_DEC,
1010                         NULL, 0x0fff,
1011                         "" }},
1012
1013                 { &hf_sna_th_vrprq,
1014                 { "Virtual Route Pacing Request",       "sna.th.vrprq", FT_BOOLEAN, 16,
1015                         TFS(&sna_th_vrprq_truth), 0x8000,
1016                         "" }},
1017
1018                 { &hf_sna_th_vrprs,
1019                 { "Virtual Route Pacing Response",      "sna.th.vrprs", FT_BOOLEAN, 16,
1020                         TFS(&sna_th_vrprs_truth), 0x4000,
1021                         "" }},
1022
1023                 { &hf_sna_th_vr_cwri,
1024                 { "Virtual Route Change Window Reply Indicator",        "sna.th.vr_cwri", FT_UINT16, BASE_DEC,
1025                         VALS(sna_th_vr_cwri_vals), 0x2000,
1026                         "Permits changing of the window size by 1 for PIUs received by the "
1027                         "sender of this bit." }},
1028
1029                 { &hf_sna_th_vr_rwi,
1030                 { "Virtual Route Reset Window Indicator",       "sna.th.vr_rwi", FT_BOOLEAN, 16,
1031                         TFS(&sna_th_vr_rwi_truth), 0x1000,
1032                         "Indicates severe congestion in a node on the virtual route." }},
1033
1034                 { &hf_sna_th_vr_snf_send,
1035                 { "Virtual Route Send Sequence Number Field",   "sna.th.vr_snf_send", FT_UINT16, BASE_DEC,
1036                         NULL, 0x0fff,
1037                         "" }},
1038
1039                 { &hf_sna_th_dsaf,
1040                 { "Destination Subarea Address Field",  "sna.th.dsaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1041                         "" }},
1042
1043                 { &hf_sna_th_osaf,
1044                 { "Origin Subarea Address Field",       "sna.th.osaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1045                         "" }},
1046
1047                 { &hf_sna_th_snai,
1048                 { "SNA Indicator",      "sna.th.snai", FT_BOOLEAN, 8, NULL, 0x10,
1049                         "Used to identify whether the PIU originated or is destined for "
1050                         "an SNA or non-SNA device." }},
1051
1052                 { &hf_sna_th_def,
1053                 { "Destination Element Field",  "sna.th.def", FT_UINT16, BASE_HEX, NULL, 0x0,
1054                         "" }},
1055
1056                 { &hf_sna_th_oef,
1057                 { "Origin Element Field",       "sna.th.oef", FT_UINT16, BASE_HEX, NULL, 0x0,
1058                         "" }},
1059
1060                 { &hf_sna_th_sa,
1061                 { "Session Address",    "sna.th.sa", FT_BYTES, BASE_HEX, NULL, 0x0,
1062                         "" }},
1063
1064                 { &hf_sna_th_cmd_fmt,
1065                 { "Command Format",     "sna.th.cmd_fmt", FT_UINT8, BASE_HEX, NULL, 0x0,
1066                         "" }},
1067
1068                 { &hf_sna_th_cmd_type,
1069                 { "Command Type",       "sna.th.cmd_type", FT_UINT8, BASE_HEX, NULL, 0x0,
1070                         "" }},
1071
1072                 { &hf_sna_th_cmd_sn,
1073                 { "Command Sequence Number",    "sna.th.cmd_sn", FT_UINT16, BASE_DEC, NULL, 0x0,
1074                         "" }},
1075
1076
1077                 { &hf_sna_rh,
1078                 { "Request/Response Header",    "sna.rh", FT_NONE, BASE_NONE, NULL, 0x0,
1079                         "" }},
1080
1081                 { &hf_sna_rh_0,
1082                 { "Request/Response Header Byte 0",     "sna.rh.0", FT_UINT8, BASE_HEX, NULL, 0x0,
1083                         "" }},
1084
1085                 { &hf_sna_rh_1,
1086                 { "Request/Response Header Byte 1",     "sna.rh.1", FT_UINT8, BASE_HEX, NULL, 0x0,
1087                         "" }},
1088
1089                 { &hf_sna_rh_2,
1090                 { "Request/Response Header Byte 2",     "sna.rh.2", FT_UINT8, BASE_HEX, NULL, 0x0,
1091                         "" }},
1092
1093                 { &hf_sna_rh_rri,
1094                 { "Request/Response Indicator", "sna.rh.rri", FT_UINT8, BASE_DEC, VALS(sna_rh_rri_vals), 0x80,
1095                         "Denotes whether this is a request or a response." }},
1096
1097                 { &hf_sna_rh_ru_category,
1098                 { "Request/Response Unit Category",     "sna.rh.ru_category", FT_UINT8, BASE_HEX,
1099                         VALS(sna_rh_ru_category_vals), 0x60,
1100                         "" }},
1101
1102                 { &hf_sna_rh_fi,
1103                 { "Format Indicator",           "sna.rh.fi", FT_BOOLEAN, 8, TFS(&sna_rh_fi_truth), 0x08,
1104                         "" }},
1105
1106                 { &hf_sna_rh_sdi,
1107                 { "Sense Data Included",        "sna.rh.sdi", FT_BOOLEAN, 8, TFS(&sna_rh_sdi_truth), 0x04,
1108                         "Indicates that a 4-byte sense data field is included in the associated RU." }},
1109
1110                 { &hf_sna_rh_bci,
1111                 { "Begin Chain Indicator",      "sna.rh.bci", FT_BOOLEAN, 8, TFS(&sna_rh_bci_truth), 0x02,
1112                         "" }},
1113
1114                 { &hf_sna_rh_eci,
1115                 { "End Chain Indicator",        "sna.rh.eci", FT_BOOLEAN, 8, TFS(&sna_rh_eci_truth), 0x01,
1116                         "" }},
1117
1118                 { &hf_sna_rh_dr1,
1119                 { "Definite Response 1 Indicator",      "sna.rh.dr1", FT_BOOLEAN, 8, NULL, 0x80,
1120                         "" }},
1121
1122                 { &hf_sna_rh_lcci,
1123                 { "Length-Checked Compression Indicator",       "sna.rh.lcci", FT_BOOLEAN, 8,
1124                         TFS(&sna_rh_lcci_truth), 0x40,
1125                         "" }},
1126
1127                 { &hf_sna_rh_dr2,
1128                 { "Definite Response 2 Indicator",      "sna.rh.dr2", FT_BOOLEAN, 8, NULL, 0x20,
1129                         "" }},
1130
1131                 { &hf_sna_rh_eri,
1132                 { "Exception Response Indicator",       "sna.rh.eri", FT_BOOLEAN, 8, NULL, 0x10,
1133                         "Used in conjunction with DR1I and DR2I to indicate, in a request, "
1134                         "the form of response requested." }},
1135
1136                 { &hf_sna_rh_rti,
1137                 { "Response Type Indicator",    "sna.rh.rti", FT_BOOLEAN, 8, TFS(&sna_rh_rti_truth), 0x10,
1138                         "" }},
1139
1140                 { &hf_sna_rh_rlwi,
1141                 { "Request Larger Window Indicator",    "sna.rh.rlwi", FT_BOOLEAN, 8, NULL, 0x04,
1142                         "Indicates whether a larger pacing window was requested." }},
1143
1144                 { &hf_sna_rh_qri,
1145                 { "Queued Response Indicator",  "sna.rh.qri", FT_BOOLEAN, 8, TFS(&sna_rh_qri_truth), 0x02,
1146                         "" }},
1147
1148                 { &hf_sna_rh_pi,
1149                 { "Pacing Indicator",   "sna.rh.pi", FT_BOOLEAN, 8, NULL, 0x01,
1150                         "" }},
1151
1152                 { &hf_sna_rh_bbi,
1153                 { "Begin Bracket Indicator",    "sna.rh.bbi", FT_BOOLEAN, 8, NULL, 0x80,
1154                         "" }},
1155
1156                 { &hf_sna_rh_ebi,
1157                 { "End Bracket Indicator",      "sna.rh.ebi", FT_BOOLEAN, 8, NULL, 0x40,
1158                         "" }},
1159
1160                 { &hf_sna_rh_cdi,
1161                 { "Change Direction Indicator", "sna.rh.cdi", FT_BOOLEAN, 8, NULL, 0x20,
1162                         "" }},
1163
1164                 { &hf_sna_rh_csi,
1165                 { "Code Selection Indicator",   "sna.rh.csi", FT_BOOLEAN, 8, VALS(sna_rh_csi_vals), 0x08,
1166                         "Specifies the encoding used for the associated FMD RU." }},
1167
1168                 { &hf_sna_rh_edi,
1169                 { "Enciphered Data Indicator",  "sna.rh.edi", FT_BOOLEAN, 8, NULL, 0x04,
1170                         "Indicates that information in the associated RU is enciphered under "
1171                         "session-level cryptography protocols." }},
1172
1173                 { &hf_sna_rh_pdi,
1174                 { "Padded Data Indicator",      "sna.rh.pdi", FT_BOOLEAN, 8, NULL, 0x02,
1175                         "Indicates that the RU was padded at the end, before encipherment, to the next "
1176                         "integral multiple of 8 bytes." }},
1177
1178                 { &hf_sna_rh_cebi,
1179                 { "Conditional End Bracket Indicator",  "sna.rh.cebi", FT_BOOLEAN, 8, NULL, 0x01,
1180                         "Used to indicate the beginning or end of a group of exchanged "
1181                         "requests and responses called a bracket. Only used on LU-LU sessions." }},
1182
1183                 { &hf_sna_ru,
1184                 { "Request/Response Unit",      "sna.ru", FT_NONE, BASE_NONE, NULL, 0x0,
1185                         ""}},
1186         };
1187         static gint *ett[] = {
1188                 &ett_sna,
1189                 &ett_sna_th,
1190                 &ett_sna_th_fid,
1191                 &ett_sna_rh,
1192                 &ett_sna_rh_0,
1193                 &ett_sna_rh_1,
1194                 &ett_sna_rh_2,
1195         };
1196
1197         proto_sna = proto_register_protocol("Systems Network Architecture", "sna");
1198         proto_register_field_array(proto_sna, hf, array_length(hf));
1199         proto_register_subtree_array(ett, array_length(ett));
1200 }