packet-sna.c

   1 /* packet-sna.c
   2  * Routines for SNA
   3  * Gilbert Ramirez <gram@xiexie.org>
   4  *
   5  * $Id: packet-sna.c,v 1.11 2000/01/07 22:05:39 guy Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@zing.org>
   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         /* SNA data should be printed in EBCDIC, not ASCII */
 313         fd->encoding = CHAR_EBCDIC;
 314
 315         if (IS_DATA_IN_FRAME(offset)) {
 316                 /* Transmission Header Format Identifier */
 317                 th_fid = hi_nibble(pd[offset]);
 318         }
 319         else {
 320                 /* If our first byte isn't here, stop dissecting */
 321                 return;
 322         }
 323
 324         /* Summary information */
 325         if (check_col(fd, COL_PROTOCOL))
 326                 col_add_str(fd, COL_PROTOCOL, "SNA");
 327         if (check_col(fd, COL_INFO))
 328                 col_add_str(fd, COL_INFO, val_to_str(th_fid, sna_th_fid_vals, "Unknown FID: %01x"));
 329
 330         if (tree) {
 331
 332                 /* Don't bother setting length. We'll set it later after we find
 333                  * the lengths of TH/RH/RU */
 334                 sna_ti = proto_tree_add_item(tree, proto_sna, offset, 0, NULL);
 335                 sna_tree = proto_item_add_subtree(sna_ti, ett_sna);
 336
 337                 /* --- TH --- */
 338                 /* Don't bother setting length. We'll set it later after we find
 339                  * the length of TH */
 340                 th_ti = proto_tree_add_item(sna_tree, hf_sna_th,  offset, 0, NULL);
 341                 th_tree = proto_item_add_subtree(th_ti, ett_sna_th);
 342         }
 343
 344         /* Get size of TH */
 345         switch(th_fid) {
 346                 case 0x0:
 347                 case 0x1:
 348                         th_header_len = dissect_fid0_1(pd, offset, fd, th_tree);
 349                         break;
 350                 case 0x2:
 351                         th_header_len = dissect_fid2(pd, offset, fd, th_tree);
 352                         break;
 353                 case 0x3:
 354                         th_header_len = dissect_fid3(pd, offset, fd, th_tree);
 355                         break;
 356                 case 0x4:
 357                         th_header_len = dissect_fid4(pd, offset, fd, th_tree);
 358                         break;
 359                 case 0x5:
 360                         th_header_len = dissect_fid5(pd, offset, fd, th_tree);
 361                         break;
 362                 case 0xf:
 363                         th_header_len = dissect_fidf(pd, offset, fd, th_tree);
 364                         break;
 365                 default:
 366                         dissect_data(pd, offset+1, fd, tree);
 367         }
 368
 369         sna_header_len += th_header_len;
 370         offset += th_header_len;
 371
 372         if (tree) {
 373                 proto_item_set_len(th_ti, th_header_len);
 374
 375                 /* --- RH --- */
 376                 if (BYTES_ARE_IN_FRAME(offset, 3)) {
 377                         rh_ti = proto_tree_add_item(sna_tree, hf_sna_rh, offset, 3, NULL);
 378                         rh_tree = proto_item_add_subtree(rh_ti, ett_sna_rh);
 379                         dissect_rh(pd, offset, fd, rh_tree);
 380                         sna_header_len += 3;
 381                         offset += 3;
 382                 }
 383                 else {
 384                         /* If our first byte isn't here, stop dissecting */
 385                         return;
 386                 }
 387
 388                 proto_item_set_len(sna_ti, sna_header_len);
 389         }
 390         else {
 391                 if (BYTES_ARE_IN_FRAME(offset, 3)) {
 392                         sna_header_len += 3;
 393                         offset += 3;
 394                 }
 395
 396         }
 397
 398         if (IS_DATA_IN_FRAME(offset+1)) {
 399                 dissect_data(pd, offset, fd, tree);
 400         }
 401 }
 402
 403 /* FID Types 0 and 1 */
 404 static int
 405 dissect_fid0_1 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 406
 407         proto_tree      *bf_tree;
 408         proto_item      *bf_item;
 409         guint8          th_0;
 410         guint16         daf, oaf, snf, dcf;
 411
 412         static int bytes_in_header = 10;
 413
 414         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 415                 return 0;
 416         }
 417
 418         th_0 = pd[offset+0];
 419         daf = pntohs(&pd[offset+2]);
 420         oaf = pntohs(&pd[offset+4]);
 421         snf = pntohs(&pd[offset+6]);
 422         dcf = pntohs(&pd[offset+8]);
 423
 424         SET_ADDRESS(&pi.net_src, AT_SNA, 2, &pd[offset+4]);
 425         SET_ADDRESS(&pi.src, AT_SNA, 2, &pd[offset+4]);
 426         SET_ADDRESS(&pi.net_dst, AT_SNA, 2, &pd[offset+2]);
 427         SET_ADDRESS(&pi.dst, AT_SNA, 2, &pd[offset+2]);
 428
 429         if (!tree) {
 430                 return bytes_in_header;
 431         }
 432
 433         /* Create the bitfield tree */
 434         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
 435         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 436
 437         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
 438         proto_tree_add_item(bf_tree, hf_sna_th_mpf, offset, 1, th_0);
 439         proto_tree_add_item(bf_tree, hf_sna_th_efi ,offset, 1, th_0);
 440
 441         proto_tree_add_text(tree, offset+1, 1, "Reserved");
 442         proto_tree_add_item(tree, hf_sna_th_daf ,offset+2, 1, daf);
 443         proto_tree_add_item(tree, hf_sna_th_oaf ,offset+4, 1, oaf);
 444         proto_tree_add_item(tree, hf_sna_th_snf ,offset+6, 2, snf);
 445         proto_tree_add_item(tree, hf_sna_th_dcf ,offset+8, 2, dcf);
 446
 447         return bytes_in_header;
 448
 449 }
 450
 451
 452 /* FID Type 2 */
 453 static int
 454 dissect_fid2 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 455
 456         proto_tree      *bf_tree;
 457         proto_item      *bf_item;
 458         guint8          th_0, daf, oaf;
 459         guint16         snf;
 460
 461         static int bytes_in_header = 6;
 462
 463         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 464                 return 0;
 465         }
 466
 467         th_0 = pd[offset+0];
 468         daf = pd[offset+2];
 469         oaf = pd[offset+3];
 470
 471         /* Addresses in FID 2 are FT_UINT8 */
 472         SET_ADDRESS(&pi.net_src, AT_SNA, 1, &pd[offset+3]);
 473         SET_ADDRESS(&pi.src, AT_SNA, 1, &pd[offset+3]);
 474         SET_ADDRESS(&pi.net_dst, AT_SNA, 1, &pd[offset+2]);
 475         SET_ADDRESS(&pi.dst, AT_SNA, 1, &pd[offset+2]);
 476
 477         if (!tree) {
 478                 return bytes_in_header;
 479         }
 480
 481         snf = pntohs(&pd[offset+4]);
 482
 483         /* Create the bitfield tree */
 484         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
 485         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 486
 487         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
 488         proto_tree_add_item(bf_tree, hf_sna_th_mpf, offset, 1, th_0);
 489         proto_tree_add_item(bf_tree, hf_sna_th_odai ,offset, 1, th_0);
 490         proto_tree_add_item(bf_tree, hf_sna_th_efi ,offset, 1, th_0);
 491
 492         /* Addresses in FID 2 are FT_UINT8 */
 493         proto_tree_add_text(tree, offset+1, 1, "Reserved");
 494         proto_tree_add_item_format(tree, hf_sna_th_daf ,offset+2, 1, daf,
 495                         "Destination Address Field: 0x%02x", daf);
 496         proto_tree_add_item_format(tree, hf_sna_th_oaf ,offset+3, 1, oaf,
 497                         "Origin Address Field: 0x%02x", oaf);
 498         proto_tree_add_item(tree, hf_sna_th_snf ,offset+4, 2, snf);
 499
 500         return bytes_in_header;
 501 }
 502
 503 /* FID Type 3 */
 504 static int
 505 dissect_fid3 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 506
 507         proto_tree      *bf_tree;
 508         proto_item      *bf_item;
 509         guint8          th_0;
 510         guint8          lsid;
 511
 512         static int bytes_in_header = 2;
 513
 514         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 515                 return 0;
 516         }
 517
 518         if (!tree) {
 519                 return bytes_in_header;
 520         }
 521
 522         th_0 = pd[offset+0];
 523         lsid = pd[offset+1];
 524
 525         /* Create the bitfield tree */
 526         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
 527         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 528
 529         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
 530         proto_tree_add_item(bf_tree, hf_sna_th_mpf, offset, 1, th_0);
 531         proto_tree_add_item(bf_tree, hf_sna_th_efi ,offset, 1, th_0);
 532
 533         proto_tree_add_item(tree, hf_sna_th_lsid ,offset+1, 1, lsid);
 534
 535         return bytes_in_header;
 536 }
 537
 538 /* FID Type 4 */
 539
 540 gchar *
 541 sna_fid_type_4_addr_to_str(const struct sna_fid_type_4_addr *addrp)
 542 {
 543   static gchar  str[3][14];
 544   static gchar  *cur;
 545
 546   if (cur == &str[0][0]) {
 547     cur = &str[1][0];
 548   } else if (cur == &str[1][0]) {
 549     cur = &str[2][0];
 550   } else {
 551     cur = &str[0][0];
 552   }
 553
 554   sprintf(cur, "%08X.%04X", addrp->saf, addrp->ef);
 555   return cur;
 556 }
 557
 558 static int
 559 dissect_fid4 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 560
 561         proto_tree      *bf_tree;
 562         proto_item      *bf_item;
 563         guint8          th_byte, mft;
 564         guint16         th_word;
 565         guint16         def, oef, snf, dcf;
 566         guint32         dsaf, osaf;
 567         static struct sna_fid_type_4_addr src, dst;
 568
 569         static int bytes_in_header = 26;
 570
 571         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 572                 return 0;
 573         }
 574
 575         dsaf = pntohl(&pd[offset+8]);
 576         osaf = pntohl(&pd[offset+12]);
 577         def = pntohs(&pd[offset+18]);
 578         oef = pntohs(&pd[offset+20]);
 579         snf = pntohs(&pd[offset+22]);
 580         dcf = pntohs(&pd[offset+24]);
 581
 582         /* Addresses in FID 4 are discontiguous, sigh */
 583         src.saf = osaf;
 584         src.ef = oef;
 585         dst.saf = dsaf;
 586         dst.ef = def;
 587         SET_ADDRESS(&pi.net_src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 588             (guint8 *)&src);
 589         SET_ADDRESS(&pi.src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 590             (guint8 *)&src);
 591         SET_ADDRESS(&pi.net_dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 592             (guint8 *)&dst);
 593         SET_ADDRESS(&pi.dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 594             (guint8 *)&dst);
 595
 596         if (!tree) {
 597                 return bytes_in_header;
 598         }
 599
 600         th_byte = pd[offset];
 601
 602         /* Create the bitfield tree */
 603         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_byte);
 604         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 605
 606         /* Byte 0 */
 607         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_byte);
 608         proto_tree_add_item(bf_tree, hf_sna_th_tg_sweep, offset, 1, th_byte);
 609         proto_tree_add_item(bf_tree, hf_sna_th_er_vr_supp_ind, offset, 1, th_byte);
 610         proto_tree_add_item(bf_tree, hf_sna_th_vr_pac_cnt_ind, offset, 1, th_byte);
 611         proto_tree_add_item(bf_tree, hf_sna_th_ntwk_prty, offset, 1, th_byte);
 612
 613         offset += 1;
 614         th_byte = pd[offset];
 615
 616         /* Create the bitfield tree */
 617         bf_item = proto_tree_add_text(tree, offset, 1, "Transmision Header Byte 1");
 618         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 619
 620         /* Byte 1 */
 621         proto_tree_add_item(bf_tree, hf_sna_th_tgsf, offset, 1, th_byte);
 622         proto_tree_add_item(bf_tree, hf_sna_th_mft, offset, 1, th_byte);
 623         proto_tree_add_item(bf_tree, hf_sna_th_piubf, offset, 1, th_byte);
 624
 625         mft = th_byte & 0x04;
 626         offset += 1;
 627         th_byte = pd[offset];
 628
 629         /* Create the bitfield tree */
 630         bf_item = proto_tree_add_text(tree, offset, 1, "Transmision Header Byte 2");
 631         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 632
 633         /* Byte 2 */
 634         if (mft) {
 635                 proto_tree_add_item(bf_tree, hf_sna_th_nlpoi, offset, 1, th_byte);
 636                 proto_tree_add_item(bf_tree, hf_sna_th_nlp_cp, offset, 1, th_byte);
 637         }
 638         else {
 639                 proto_tree_add_item(bf_tree, hf_sna_th_iern, offset, 1, th_byte);
 640         }
 641         proto_tree_add_item(bf_tree, hf_sna_th_ern, offset, 1, th_byte);
 642
 643         offset += 1;
 644         th_byte = pd[offset];
 645
 646         /* Create the bitfield tree */
 647         bf_item = proto_tree_add_text(tree, offset, 1, "Transmision Header Byte 3");
 648         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 649
 650         /* Byte 3 */
 651         proto_tree_add_item(bf_tree, hf_sna_th_vrn, offset, 1, th_byte);
 652         proto_tree_add_item(bf_tree, hf_sna_th_tpf, offset, 1, th_byte);
 653
 654         offset += 1;
 655         th_word = pntohs(&pd[offset]);
 656
 657         /* Create the bitfield tree */
 658         bf_item = proto_tree_add_text(tree, offset, 2, "Transmision Header Bytes 4-5");
 659         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 660
 661         /* Bytes 4-5 */
 662         proto_tree_add_item(bf_tree, hf_sna_th_vr_cwi, offset, 2, th_word);
 663         proto_tree_add_item(bf_tree, hf_sna_th_tg_nonfifo_ind, offset, 2, th_word);
 664         proto_tree_add_item(bf_tree, hf_sna_th_vr_sqti, offset, 2, th_word);
 665
 666         /* I'm not sure about byte-order on this one... */
 667         proto_tree_add_item(bf_tree, hf_sna_th_tg_snf, offset, 2, th_word);
 668
 669         offset += 2;
 670         th_word = pntohs(&pd[offset]);
 671
 672         /* Create the bitfield tree */
 673         bf_item = proto_tree_add_text(tree, offset, 2, "Transmision Header Bytes 6-7");
 674         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 675
 676         /* Bytes 6-7 */
 677         proto_tree_add_item(bf_tree, hf_sna_th_vrprq, offset, 2, th_word);
 678         proto_tree_add_item(bf_tree, hf_sna_th_vrprs, offset, 2, th_word);
 679         proto_tree_add_item(bf_tree, hf_sna_th_vr_cwri, offset, 2, th_word);
 680         proto_tree_add_item(bf_tree, hf_sna_th_vr_rwi, offset, 2, th_word);
 681
 682         /* I'm not sure about byte-order on this one... */
 683         proto_tree_add_item(bf_tree, hf_sna_th_vr_snf_send, offset, 2, th_word);
 684
 685         offset += 2;
 686
 687         /* Bytes 8-11 */
 688         proto_tree_add_item(tree, hf_sna_th_dsaf, offset, 4, dsaf);
 689
 690         offset += 4;
 691
 692         /* Bytes 12-15 */
 693         proto_tree_add_item(tree, hf_sna_th_osaf, offset, 4, osaf);
 694
 695         offset += 4;
 696         th_byte = pd[offset];
 697
 698         /* Create the bitfield tree */
 699         bf_item = proto_tree_add_text(tree, offset, 2, "Transmision Header Byte 16");
 700         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 701
 702         /* Byte 16 */
 703         proto_tree_add_item(tree, hf_sna_th_snai, offset, 1, th_byte);
 704
 705         /* We luck out here because in their infinite wisdom the SNA
 706          * architects placed the MPF and EFI fields in the same bitfield
 707          * locations, even though for FID4 they're not in byte 0.
 708          * Thank you IBM! */
 709         proto_tree_add_item(tree, hf_sna_th_mpf, offset, 1, th_byte);
 710         proto_tree_add_item(tree, hf_sna_th_efi, offset, 1, th_byte);
 711
 712         offset += 2; /* 1 for byte 16, 1 for byte 17 which is reserved */
 713
 714         /* Bytes 18-25 */
 715         proto_tree_add_item(tree, hf_sna_th_def, offset+0, 2, def);
 716         proto_tree_add_item(tree, hf_sna_th_oef, offset+2, 2, oef);
 717         proto_tree_add_item(tree, hf_sna_th_snf, offset+4, 2, snf);
 718         proto_tree_add_item(tree, hf_sna_th_snf, offset+6, 2, dcf);
 719
 720         return bytes_in_header;
 721 }
 722
 723 /* FID Type 5 */
 724 static int
 725 dissect_fid5 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 726
 727         proto_tree      *bf_tree;
 728         proto_item      *bf_item;
 729         guint8          th_0;
 730         guint16         snf;
 731
 732         static int bytes_in_header = 12;
 733
 734         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 735                 return 0;
 736         }
 737
 738         th_0 = pd[offset+0];
 739         snf = pntohs(&pd[offset+2]);
 740
 741         if (!tree) {
 742                 return bytes_in_header;
 743         }
 744
 745         /* Create the bitfield tree */
 746         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
 747         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 748
 749         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
 750         proto_tree_add_item(bf_tree, hf_sna_th_mpf, offset, 1, th_0);
 751         proto_tree_add_item(bf_tree, hf_sna_th_efi, offset, 1, th_0);
 752
 753         proto_tree_add_text(tree, offset+1, 1, "Reserved");
 754         proto_tree_add_item(tree, hf_sna_th_snf, offset+2, 2, snf);
 755
 756         proto_tree_add_item(tree, hf_sna_th_sa, offset+4, 8, &pd[offset+4]);
 757
 758         return bytes_in_header;
 759
 760 }
 761
 762 /* FID Type f */
 763 static int
 764 dissect_fidf (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 765
 766         proto_tree      *bf_tree;
 767         proto_item      *bf_item;
 768         guint8          th_0, cmd_fmt, cmd_type;
 769         guint16         cmd_sn, dcf;
 770
 771         static int bytes_in_header = 26;
 772
 773         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 774                 return 0;
 775         }
 776
 777         th_0 = pd[offset+0];
 778         cmd_fmt = pd[offset+2];
 779         cmd_type = pd[offset+3];
 780         cmd_sn = pntohs(&pd[offset+4]);
 781
 782         /* Yup, bytes 6-23 are reserved! */
 783         dcf = pntohs(&pd[offset+24]);
 784
 785         if (!tree) {
 786                 return bytes_in_header;
 787         }
 788
 789         /* Create the bitfield tree */
 790         bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
 791         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 792
 793         proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
 794         proto_tree_add_text(tree, offset+1, 1, "Reserved");
 795
 796         proto_tree_add_item(tree, hf_sna_th_cmd_fmt,  offset+2, 1, cmd_fmt);
 797         proto_tree_add_item(tree, hf_sna_th_cmd_type, offset+3, 1, cmd_type);
 798         proto_tree_add_item(tree, hf_sna_th_cmd_sn,   offset+4, 2, cmd_sn);
 799
 800         proto_tree_add_text(tree, offset+6, 18, "Reserved");
 801
 802         proto_tree_add_item(tree, hf_sna_th_dcf, offset+24, 8, dcf);
 803
 804         return bytes_in_header;
 805 }
 806
 807
 808 /* RH */
 809 static void
 810 dissect_rh (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 811
 812         proto_tree      *bf_tree;
 813         proto_item      *bf_item;
 814         gboolean        is_response;
 815         guint8          rh_0, rh_1, rh_2;
 816
 817         rh_0 = pd[offset+0];
 818         rh_1 = pd[offset+1];
 819         rh_2 = pd[offset+2];
 820
 821         is_response = (rh_0 & 0x80);
 822
 823         /* Create the bitfield tree for byte 0*/
 824         bf_item = proto_tree_add_item(tree, hf_sna_rh_0, offset, 1, rh_0);
 825         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_0);
 826
 827         proto_tree_add_item(bf_tree, hf_sna_rh_rri, offset, 1, rh_0);
 828         proto_tree_add_item(bf_tree, hf_sna_rh_ru_category, offset, 1, rh_0);
 829         proto_tree_add_item(bf_tree, hf_sna_rh_fi, offset, 1, rh_0);
 830         proto_tree_add_item(bf_tree, hf_sna_rh_sdi, offset, 1, rh_0);
 831         proto_tree_add_item(bf_tree, hf_sna_rh_bci, offset, 1, rh_0);
 832         proto_tree_add_item(bf_tree, hf_sna_rh_eci, offset, 1, rh_0);
 833
 834         offset += 1;
 835
 836         /* Create the bitfield tree for byte 1*/
 837         bf_item = proto_tree_add_item(tree, hf_sna_rh_1, offset, 1, rh_1);
 838         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_1);
 839
 840         proto_tree_add_item(bf_tree, hf_sna_rh_dr1,  offset, 1, rh_1);
 841
 842         if (!is_response) {
 843                 proto_tree_add_item(bf_tree, hf_sna_rh_lcci, offset, 1, rh_1);
 844         }
 845
 846         proto_tree_add_item(bf_tree, hf_sna_rh_dr2,  offset, 1, rh_1);
 847
 848         if (is_response) {
 849                 proto_tree_add_item(bf_tree, hf_sna_rh_rti,  offset, 1, rh_1);
 850         }
 851         else {
 852                 proto_tree_add_item(bf_tree, hf_sna_rh_eri,  offset, 1, rh_1);
 853                 proto_tree_add_item(bf_tree, hf_sna_rh_rlwi, offset, 1, rh_1);
 854         }
 855
 856         proto_tree_add_item(bf_tree, hf_sna_rh_qri, offset, 1, rh_1);
 857         proto_tree_add_item(bf_tree, hf_sna_rh_pi,  offset, 1, rh_1);
 858
 859         offset += 1;
 860
 861         /* Create the bitfield tree for byte 2*/
 862         bf_item = proto_tree_add_item(tree, hf_sna_rh_2, offset, 1, rh_2);
 863
 864         if (!is_response) {
 865                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_2);
 866
 867                 proto_tree_add_item(bf_tree, hf_sna_rh_bbi,  offset, 1, rh_2);
 868                 proto_tree_add_item(bf_tree, hf_sna_rh_ebi,  offset, 1, rh_2);
 869                 proto_tree_add_item(bf_tree, hf_sna_rh_cdi,  offset, 1, rh_2);
 870                 proto_tree_add_item(bf_tree, hf_sna_rh_csi,  offset, 1, rh_2);
 871                 proto_tree_add_item(bf_tree, hf_sna_rh_edi,  offset, 1, rh_2);
 872                 proto_tree_add_item(bf_tree, hf_sna_rh_pdi,  offset, 1, rh_2);
 873                 proto_tree_add_item(bf_tree, hf_sna_rh_cebi, offset, 1, rh_2);
 874         }
 875
 876         /* XXX - check for sdi. If TRUE, the next 4 bytes will be sense data */
 877 }
 878
 879 void
 880 proto_register_sna(void)
 881 {
 882         static hf_register_info hf[] = {
 883                 { &hf_sna_th,
 884                 { "Transmission Header",        "sna.th", FT_NONE, BASE_NONE, NULL, 0x0,
 885                         "" }},
 886
 887                 { &hf_sna_th_0,
 888                 { "Transmission Header Byte 0", "sna.th.0", FT_UINT8, BASE_HEX, NULL, 0x0,
 889                         "Byte 0 of Tranmission Header contains FID, MPF, ODAI,"
 890                         " and EFI as bitfields." }},
 891
 892                 { &hf_sna_th_fid,
 893                 { "Format Identifer",           "sna.th.fid", FT_UINT8, BASE_HEX, VALS(sna_th_fid_vals), 0xf0,
 894                         "Format Identification" }},
 895
 896                 { &hf_sna_th_mpf,
 897                 { "Mapping Field",              "sna.th.mpf", FT_UINT8, BASE_NONE, VALS(sna_th_mpf_vals), 0x0c,
 898                         "The Mapping Field specifies whether the information field"
 899                         " associated with the TH is a complete or partial BIU." }},
 900
 901                 { &hf_sna_th_odai,
 902                 { "ODAI Assignment Indicator",  "sna.th.odai", FT_UINT8, BASE_DEC, NULL, 0x02,
 903                         "The ODAI indicates which node assigned the OAF'-DAF' values"
 904                         " carried in the TH." }},
 905
 906                 { &hf_sna_th_efi,
 907                 { "Expedited Flow Indicator",   "sna.th.efi", FT_UINT8, BASE_DEC, VALS(sna_th_efi_vals), 0x01,
 908                         "The EFI designates whether the PIU belongs to the normal"
 909                         " or expedited flow." }},
 910
 911                 { &hf_sna_th_daf,
 912                 { "Destination Address Field",  "sna.th.daf", FT_UINT16, BASE_HEX, NULL, 0x0,
 913                         "" }},
 914
 915                 { &hf_sna_th_oaf,
 916                 { "Origin Address Field",       "sna.th.oaf", FT_UINT16, BASE_HEX, NULL, 0x0,
 917                         "" }},
 918
 919                 { &hf_sna_th_snf,
 920                 { "Sequence Number Field",      "sna.th.snf", FT_UINT16, BASE_NONE, NULL, 0x0,
 921                         "The Sequence Number Field contains a numerical identifier for"
 922                         " the associated BIU."}},
 923
 924                 { &hf_sna_th_dcf,
 925                 { "Data Count Field",   "sna.th.dcf", FT_UINT16, BASE_DEC, NULL, 0x0,
 926                         "A binary count of the number of bytes in the BIU or BIU segment associated "
 927                         "with the tranmission header. The count does not include any of the bytes "
 928                         "in the transmission header."}},
 929
 930                 { &hf_sna_th_lsid,
 931                 { "Local Session Identification",       "sna.th.lsid", FT_UINT8, BASE_HEX, NULL, 0x0,
 932                         "" }},
 933
 934                 { &hf_sna_th_tg_sweep,
 935                 { "Transmission Group Sweep",           "sna.th.tg_sweep", FT_UINT8, BASE_DEC,
 936                         VALS(sna_th_tg_sweep_vals), 0x08,
 937                         "" }},
 938
 939                 { &hf_sna_th_er_vr_supp_ind,
 940                 { "ER and VR Support Indicator",        "sna.th.er_vr_supp_ind", FT_UINT8, BASE_DEC,
 941                         VALS(sna_th_er_vr_supp_ind_vals), 0x04,
 942                         "" }},
 943
 944                 { &hf_sna_th_vr_pac_cnt_ind,
 945                 { "Virtual Route Pacing Count Indicator",       "sna.th.vr_pac_cnt_ind",
 946                         FT_UINT8, BASE_DEC, VALS(sna_th_vr_pac_cnt_ind_vals), 0x02,
 947                         "" }},
 948
 949                 { &hf_sna_th_ntwk_prty,
 950                 { "Network Priority",   "sna.th.ntwk_prty",
 951                         FT_UINT8, BASE_DEC, VALS(sna_th_ntwk_prty_vals), 0x01,
 952                         "" }},
 953
 954                 { &hf_sna_th_tgsf,
 955                 { "Transmission Group Segmenting Field",        "sna.th.tgsf",
 956                         FT_UINT8, BASE_HEX, VALS(sna_th_tgsf_vals), 0xc0,
 957                         "" }},
 958
 959                 { &hf_sna_th_mft,
 960                 { "MPR FID4 Type",      "sna.th.mft", FT_BOOLEAN, BASE_NONE, NULL, 0x04,
 961                         "" }},
 962
 963                 { &hf_sna_th_piubf,
 964                 { "PIU Blocking Field", "sna.th.piubf", FT_UINT8, BASE_HEX,
 965                         VALS(sna_th_piubf_vals), 0x03,
 966                         "Specifies whether this frame contains a single PIU or multiple PIUs." }},
 967
 968                 { &hf_sna_th_iern,
 969                 { "Initial Explicit Route Number",      "sna.th.iern", FT_UINT8, BASE_DEC, NULL, 0xf0,
 970                         "" }},
 971
 972                 { &hf_sna_th_nlpoi,
 973                 { "NLP Offset Indicator",       "sna.th.nlpoi", FT_UINT8, BASE_DEC,
 974                         VALS(sna_th_nlpoi_vals), 0x80,
 975                         "" }},
 976
 977                 { &hf_sna_th_nlp_cp,
 978                 { "NLP Count or Padding",       "sna.th.nlp_cp", FT_UINT8, BASE_DEC, NULL, 0x70,
 979                         "" }},
 980
 981                 { &hf_sna_th_ern,
 982                 { "Explicit Route Number",      "sna.th.ern", FT_UINT8, BASE_DEC, NULL, 0x0f,
 983                         "The ERN in a TH identifies an explicit route direction of flow." }},
 984
 985                 { &hf_sna_th_vrn,
 986                 { "Virtual Route Number",       "sna.th.vrn", FT_UINT8, BASE_DEC, NULL, 0xf0,
 987                         "" }},
 988
 989                 { &hf_sna_th_tpf,
 990                 { "Transmission Priority Field",        "sna.th.tpf", FT_UINT8, BASE_HEX,
 991                         VALS(sna_th_tpf_vals), 0x03,
 992                         "" }},
 993
 994                 { &hf_sna_th_vr_cwi,
 995                 { "Virtual Route Change Window Indicator",      "sna.th.vr_cwi", FT_UINT16, BASE_DEC,
 996                         VALS(sna_th_vr_cwi_vals), 0x8000,
 997                         "Used to change the window size of the virtual route by 1." }},
 998
 999                 { &hf_sna_th_tg_nonfifo_ind,
1000                 { "Transmission Group Non-FIFO Indicator",      "sna.th.tg_nonfifo_ind", FT_BOOLEAN, 16,
1001                         TFS(&sna_th_tg_nonfifo_ind_truth), 0x4000,
1002                         "Indicates whether or not FIFO discipline is to enforced in "
1003                         "transmitting PIUs through the tranmission groups to prevent the PIUs "
1004                         "getting out of sequence during transmission over the TGs." }},
1005
1006                 { &hf_sna_th_vr_sqti,
1007                 { "Virtual Route Sequence and Type Indicator",  "sna.th.vr_sqti", FT_UINT16, BASE_HEX,
1008                         VALS(sna_th_vr_sqti_vals), 0x3000,
1009                         "Specifies the PIU type." }},
1010
1011                 { &hf_sna_th_tg_snf,
1012                 { "Transmission Group Sequence Number Field",   "sna.th.tg_snf", FT_UINT16, BASE_DEC,
1013                         NULL, 0x0fff,
1014                         "" }},
1015
1016                 { &hf_sna_th_vrprq,
1017                 { "Virtual Route Pacing Request",       "sna.th.vrprq", FT_BOOLEAN, 16,
1018                         TFS(&sna_th_vrprq_truth), 0x8000,
1019                         "" }},
1020
1021                 { &hf_sna_th_vrprs,
1022                 { "Virtual Route Pacing Response",      "sna.th.vrprs", FT_BOOLEAN, 16,
1023                         TFS(&sna_th_vrprs_truth), 0x4000,
1024                         "" }},
1025
1026                 { &hf_sna_th_vr_cwri,
1027                 { "Virtual Route Change Window Reply Indicator",        "sna.th.vr_cwri", FT_UINT16, BASE_DEC,
1028                         VALS(sna_th_vr_cwri_vals), 0x2000,
1029                         "Permits changing of the window size by 1 for PIUs received by the "
1030                         "sender of this bit." }},
1031
1032                 { &hf_sna_th_vr_rwi,
1033                 { "Virtual Route Reset Window Indicator",       "sna.th.vr_rwi", FT_BOOLEAN, 16,
1034                         TFS(&sna_th_vr_rwi_truth), 0x1000,
1035                         "Indicates severe congestion in a node on the virtual route." }},
1036
1037                 { &hf_sna_th_vr_snf_send,
1038                 { "Virtual Route Send Sequence Number Field",   "sna.th.vr_snf_send", FT_UINT16, BASE_DEC,
1039                         NULL, 0x0fff,
1040                         "" }},
1041
1042                 { &hf_sna_th_dsaf,
1043                 { "Destination Subarea Address Field",  "sna.th.dsaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1044                         "" }},
1045
1046                 { &hf_sna_th_osaf,
1047                 { "Origin Subarea Address Field",       "sna.th.osaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1048                         "" }},
1049
1050                 { &hf_sna_th_snai,
1051                 { "SNA Indicator",      "sna.th.snai", FT_BOOLEAN, 8, NULL, 0x10,
1052                         "Used to identify whether the PIU originated or is destined for "
1053                         "an SNA or non-SNA device." }},
1054
1055                 { &hf_sna_th_def,
1056                 { "Destination Element Field",  "sna.th.def", FT_UINT16, BASE_HEX, NULL, 0x0,
1057                         "" }},
1058
1059                 { &hf_sna_th_oef,
1060                 { "Origin Element Field",       "sna.th.oef", FT_UINT16, BASE_HEX, NULL, 0x0,
1061                         "" }},
1062
1063                 { &hf_sna_th_sa,
1064                 { "Session Address",    "sna.th.sa", FT_BYTES, BASE_HEX, NULL, 0x0,
1065                         "" }},
1066
1067                 { &hf_sna_th_cmd_fmt,
1068                 { "Command Format",     "sna.th.cmd_fmt", FT_UINT8, BASE_HEX, NULL, 0x0,
1069                         "" }},
1070
1071                 { &hf_sna_th_cmd_type,
1072                 { "Command Type",       "sna.th.cmd_type", FT_UINT8, BASE_HEX, NULL, 0x0,
1073                         "" }},
1074
1075                 { &hf_sna_th_cmd_sn,
1076                 { "Command Sequence Number",    "sna.th.cmd_sn", FT_UINT16, BASE_DEC, NULL, 0x0,
1077                         "" }},
1078
1079
1080                 { &hf_sna_rh,
1081                 { "Request/Response Header",    "sna.rh", FT_NONE, BASE_NONE, NULL, 0x0,
1082                         "" }},
1083
1084                 { &hf_sna_rh_0,
1085                 { "Request/Response Header Byte 0",     "sna.rh.0", FT_UINT8, BASE_HEX, NULL, 0x0,
1086                         "" }},
1087
1088                 { &hf_sna_rh_1,
1089                 { "Request/Response Header Byte 1",     "sna.rh.1", FT_UINT8, BASE_HEX, NULL, 0x0,
1090                         "" }},
1091
1092                 { &hf_sna_rh_2,
1093                 { "Request/Response Header Byte 2",     "sna.rh.2", FT_UINT8, BASE_HEX, NULL, 0x0,
1094                         "" }},
1095
1096                 { &hf_sna_rh_rri,
1097                 { "Request/Response Indicator", "sna.rh.rri", FT_UINT8, BASE_DEC, VALS(sna_rh_rri_vals), 0x80,
1098                         "Denotes whether this is a request or a response." }},
1099
1100                 { &hf_sna_rh_ru_category,
1101                 { "Request/Response Unit Category",     "sna.rh.ru_category", FT_UINT8, BASE_HEX,
1102                         VALS(sna_rh_ru_category_vals), 0x60,
1103                         "" }},
1104
1105                 { &hf_sna_rh_fi,
1106                 { "Format Indicator",           "sna.rh.fi", FT_BOOLEAN, 8, TFS(&sna_rh_fi_truth), 0x08,
1107                         "" }},
1108
1109                 { &hf_sna_rh_sdi,
1110                 { "Sense Data Included",        "sna.rh.sdi", FT_BOOLEAN, 8, TFS(&sna_rh_sdi_truth), 0x04,
1111                         "Indicates that a 4-byte sense data field is included in the associated RU." }},
1112
1113                 { &hf_sna_rh_bci,
1114                 { "Begin Chain Indicator",      "sna.rh.bci", FT_BOOLEAN, 8, TFS(&sna_rh_bci_truth), 0x02,
1115                         "" }},
1116
1117                 { &hf_sna_rh_eci,
1118                 { "End Chain Indicator",        "sna.rh.eci", FT_BOOLEAN, 8, TFS(&sna_rh_eci_truth), 0x01,
1119                         "" }},
1120
1121                 { &hf_sna_rh_dr1,
1122                 { "Definite Response 1 Indicator",      "sna.rh.dr1", FT_BOOLEAN, 8, NULL, 0x80,
1123                         "" }},
1124
1125                 { &hf_sna_rh_lcci,
1126                 { "Length-Checked Compression Indicator",       "sna.rh.lcci", FT_BOOLEAN, 8,
1127                         TFS(&sna_rh_lcci_truth), 0x40,
1128                         "" }},
1129
1130                 { &hf_sna_rh_dr2,
1131                 { "Definite Response 2 Indicator",      "sna.rh.dr2", FT_BOOLEAN, 8, NULL, 0x20,
1132                         "" }},
1133
1134                 { &hf_sna_rh_eri,
1135                 { "Exception Response Indicator",       "sna.rh.eri", FT_BOOLEAN, 8, NULL, 0x10,
1136                         "Used in conjunction with DR1I and DR2I to indicate, in a request, "
1137                         "the form of response requested." }},
1138
1139                 { &hf_sna_rh_rti,
1140                 { "Response Type Indicator",    "sna.rh.rti", FT_BOOLEAN, 8, TFS(&sna_rh_rti_truth), 0x10,
1141                         "" }},
1142
1143                 { &hf_sna_rh_rlwi,
1144                 { "Request Larger Window Indicator",    "sna.rh.rlwi", FT_BOOLEAN, 8, NULL, 0x04,
1145                         "Indicates whether a larger pacing window was requested." }},
1146
1147                 { &hf_sna_rh_qri,
1148                 { "Queued Response Indicator",  "sna.rh.qri", FT_BOOLEAN, 8, TFS(&sna_rh_qri_truth), 0x02,
1149                         "" }},
1150
1151                 { &hf_sna_rh_pi,
1152                 { "Pacing Indicator",   "sna.rh.pi", FT_BOOLEAN, 8, NULL, 0x01,
1153                         "" }},
1154
1155                 { &hf_sna_rh_bbi,
1156                 { "Begin Bracket Indicator",    "sna.rh.bbi", FT_BOOLEAN, 8, NULL, 0x80,
1157                         "" }},
1158
1159                 { &hf_sna_rh_ebi,
1160                 { "End Bracket Indicator",      "sna.rh.ebi", FT_BOOLEAN, 8, NULL, 0x40,
1161                         "" }},
1162
1163                 { &hf_sna_rh_cdi,
1164                 { "Change Direction Indicator", "sna.rh.cdi", FT_BOOLEAN, 8, NULL, 0x20,
1165                         "" }},
1166
1167                 { &hf_sna_rh_csi,
1168                 { "Code Selection Indicator",   "sna.rh.csi", FT_BOOLEAN, 8, VALS(sna_rh_csi_vals), 0x08,
1169                         "Specifies the encoding used for the associated FMD RU." }},
1170
1171                 { &hf_sna_rh_edi,
1172                 { "Enciphered Data Indicator",  "sna.rh.edi", FT_BOOLEAN, 8, NULL, 0x04,
1173                         "Indicates that information in the associated RU is enciphered under "
1174                         "session-level cryptography protocols." }},
1175
1176                 { &hf_sna_rh_pdi,
1177                 { "Padded Data Indicator",      "sna.rh.pdi", FT_BOOLEAN, 8, NULL, 0x02,
1178                         "Indicates that the RU was padded at the end, before encipherment, to the next "
1179                         "integral multiple of 8 bytes." }},
1180
1181                 { &hf_sna_rh_cebi,
1182                 { "Conditional End Bracket Indicator",  "sna.rh.cebi", FT_BOOLEAN, 8, NULL, 0x01,
1183                         "Used to indicate the beginning or end of a group of exchanged "
1184                         "requests and responses called a bracket. Only used on LU-LU sessions." }},
1185
1186                 { &hf_sna_ru,
1187                 { "Request/Response Unit",      "sna.ru", FT_NONE, BASE_NONE, NULL, 0x0,
1188                         ""}},
1189         };
1190         static gint *ett[] = {
1191                 &ett_sna,
1192                 &ett_sna_th,
1193                 &ett_sna_th_fid,
1194                 &ett_sna_rh,
1195                 &ett_sna_rh_0,
1196                 &ett_sna_rh_1,
1197                 &ett_sna_rh_2,
1198         };
1199
1200         proto_sna = proto_register_protocol("Systems Network Architecture", "sna");
1201         proto_register_field_array(proto_sna, hf, array_length(hf));
1202         proto_register_subtree_array(ett, array_length(ett));
1203 }