packet-sna.c

   1 /* packet-sna.c
   2  * Routines for SNA
   3  * Gilbert Ramirez <gram@xiexie.org>
   4  *
   5  * $Id: packet-sna.c,v 1.17 2000/08/07 03:21:10 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 "llcsaps.h"
  38 #include "packet-sna.h"
  39
  40 /*
  41  * http://www.wanresources.com/snacell.html
  42  *
  43  */
  44
  45 static int proto_sna = -1;
  46 static int hf_sna_th = -1;
  47 static int hf_sna_th_0 = -1;
  48 static int hf_sna_th_fid = -1;
  49 static int hf_sna_th_mpf = -1;
  50 static int hf_sna_th_odai = -1;
  51 static int hf_sna_th_efi = -1;
  52 static int hf_sna_th_daf = -1;
  53 static int hf_sna_th_oaf = -1;
  54 static int hf_sna_th_snf = -1;
  55 static int hf_sna_th_dcf = -1;
  56 static int hf_sna_th_lsid = -1;
  57 static int hf_sna_th_tg_sweep = -1;
  58 static int hf_sna_th_er_vr_supp_ind = -1;
  59 static int hf_sna_th_vr_pac_cnt_ind = -1;
  60 static int hf_sna_th_ntwk_prty = -1;
  61 static int hf_sna_th_tgsf = -1;
  62 static int hf_sna_th_mft = -1;
  63 static int hf_sna_th_piubf = -1;
  64 static int hf_sna_th_iern = -1;
  65 static int hf_sna_th_nlpoi = -1;
  66 static int hf_sna_th_nlp_cp = -1;
  67 static int hf_sna_th_ern = -1;
  68 static int hf_sna_th_vrn = -1;
  69 static int hf_sna_th_tpf = -1;
  70 static int hf_sna_th_vr_cwi = -1;
  71 static int hf_sna_th_tg_nonfifo_ind = -1;
  72 static int hf_sna_th_vr_sqti = -1;
  73 static int hf_sna_th_tg_snf = -1;
  74 static int hf_sna_th_vrprq = -1;
  75 static int hf_sna_th_vrprs = -1;
  76 static int hf_sna_th_vr_cwri = -1;
  77 static int hf_sna_th_vr_rwi = -1;
  78 static int hf_sna_th_vr_snf_send = -1;
  79 static int hf_sna_th_dsaf = -1;
  80 static int hf_sna_th_osaf = -1;
  81 static int hf_sna_th_snai = -1;
  82 static int hf_sna_th_def = -1;
  83 static int hf_sna_th_oef = -1;
  84 static int hf_sna_th_sa = -1;
  85 static int hf_sna_th_cmd_fmt = -1;
  86 static int hf_sna_th_cmd_type = -1;
  87 static int hf_sna_th_cmd_sn = -1;
  88
  89 static int hf_sna_rh = -1;
  90 static int hf_sna_rh_0 = -1;
  91 static int hf_sna_rh_1 = -1;
  92 static int hf_sna_rh_2 = -1;
  93 static int hf_sna_rh_rri = -1;
  94 static int hf_sna_rh_ru_category = -1;
  95 static int hf_sna_rh_fi = -1;
  96 static int hf_sna_rh_sdi = -1;
  97 static int hf_sna_rh_bci = -1;
  98 static int hf_sna_rh_eci = -1;
  99 static int hf_sna_rh_dr1 = -1;
 100 static int hf_sna_rh_lcci = -1;
 101 static int hf_sna_rh_dr2 = -1;
 102 static int hf_sna_rh_eri = -1;
 103 static int hf_sna_rh_rti = -1;
 104 static int hf_sna_rh_rlwi = -1;
 105 static int hf_sna_rh_qri = -1;
 106 static int hf_sna_rh_pi = -1;
 107 static int hf_sna_rh_bbi = -1;
 108 static int hf_sna_rh_ebi = -1;
 109 static int hf_sna_rh_cdi = -1;
 110 static int hf_sna_rh_csi = -1;
 111 static int hf_sna_rh_edi = -1;
 112 static int hf_sna_rh_pdi = -1;
 113 static int hf_sna_rh_cebi = -1;
 114 static int hf_sna_ru = -1;
 115
 116 static gint ett_sna = -1;
 117 static gint ett_sna_th = -1;
 118 static gint ett_sna_th_fid = -1;
 119 static gint ett_sna_rh = -1;
 120 static gint ett_sna_rh_0 = -1;
 121 static gint ett_sna_rh_1 = -1;
 122 static gint ett_sna_rh_2 = -1;
 123
 124 /* Format Identifier */
 125 static const value_string sna_th_fid_vals[] = {
 126         { 0x0,  "SNA device <--> Non-SNA Device" },
 127         { 0x1,  "Subarea Nodes, without ER or VR" },
 128         { 0x2,  "Subarea Node <--> PU2" },
 129         { 0x3,  "Subarea Node or SNA host <--> Subarea Node" },
 130         { 0x4,  "Subarea Nodes, supporting ER and VR" },
 131         { 0x5,  "HPR RTP endpoint nodes" },
 132         { 0xf,  "Adjaced Subarea Nodes, supporting ER and VR" },
 133         { 0x0,  NULL }
 134 };
 135
 136 /* Mapping Field */
 137 static const value_string sna_th_mpf_vals[] = {
 138         { 0, "Middle segment of a BIU" },
 139         { 1, "Last segment of a BIU" },
 140         { 2, "First segment of a BIU" },
 141         { 3 , "Whole BIU" },
 142         { 0,   NULL }
 143 };
 144
 145 /* Expedited Flow Indicator */
 146 static const value_string sna_th_efi_vals[] = {
 147         { 0, "Normal Flow" },
 148         { 1, "Expedited Flow" }
 149 };
 150
 151 /* Request/Response Indicator */
 152 static const value_string sna_rh_rri_vals[] = {
 153         { 0, "Request" },
 154         { 1, "Response" }
 155 };
 156
 157 /* Request/Response Unit Category */
 158 static const value_string sna_rh_ru_category_vals[] = {
 159         { 0x00, "Function Management Data (FMD)" },
 160         { 0x01, "Network Control (NC)" },
 161         { 0x10, "Data Flow Control (DFC)" },
 162         { 0x11, "Session Control (SC)" },
 163 };
 164
 165 /* Format Indicator */
 166 static const true_false_string sna_rh_fi_truth =
 167         { "FM Header", "No FM Header" };
 168
 169 /* Sense Data Included */
 170 static const true_false_string sna_rh_sdi_truth =
 171         { "Included", "Not Included" };
 172
 173 /* Begin Chain Indicator */
 174 static const true_false_string sna_rh_bci_truth =
 175         { "First in Chain", "Not First in Chain" };
 176
 177 /* End Chain Indicator */
 178 static const true_false_string sna_rh_eci_truth =
 179         { "Last in Chain", "Not Last in Chain" };
 180
 181 /* Lengith-Checked Compression Indicator */
 182 static const true_false_string sna_rh_lcci_truth =
 183         { "Compressed", "Not Compressed" };
 184
 185 /* Response Type Indicator */
 186 static const true_false_string sna_rh_rti_truth =
 187         { "Negative", "Positive" };
 188
 189 /* Exception Response Indicator */
 190 static const true_false_string sna_rh_eri_truth =
 191         { "Exception", "Definite" };
 192
 193 /* Queued Response Indicator */
 194 static const true_false_string sna_rh_qri_truth =
 195         { "Enqueue response in TC queues", "Response bypasses TC queues" };
 196
 197 /* Code Selection Indicator */
 198 static const value_string sna_rh_csi_vals[] = {
 199         { 0, "EBCDIC" },
 200         { 1, "ASCII" }
 201 };
 202
 203 /* TG Sweep */
 204 static const value_string sna_th_tg_sweep_vals[] = {
 205         { 0, "This PIU may overtake any PU ahead of it." },
 206         { 1, "This PIU does not ovetake any PIU ahead of it." }
 207 };
 208
 209 /* ER_VR_SUPP_IND */
 210 static const value_string sna_th_er_vr_supp_ind_vals[] = {
 211         { 0, "Each node supports ER and VR protocols" },
 212         { 1, "Includes at least one node that does not support ER and VR protocols"  }
 213 };
 214
 215 /* VR_PAC_CNT_IND */
 216 static const value_string sna_th_vr_pac_cnt_ind_vals[] = {
 217         { 0, "Pacing count on the VR has not reached 0" },
 218         { 1, "Pacing count on the VR has reached 0" }
 219 };
 220
 221 /* NTWK_PRTY */
 222 static const value_string sna_th_ntwk_prty_vals[] = {
 223         { 0, "PIU flows at a lower priority" },
 224         { 1, "PIU flows at network priority (highest transmission priority)" }
 225 };
 226
 227 /* TGSF */
 228 static const value_string sna_th_tgsf_vals[] = {
 229         { 0x00, "Not segmented" },
 230         { 0x01, "Last segment" },
 231         { 0x10, "First segment" },
 232         { 0x11, "Middle segment" }
 233 };
 234
 235 /* PIUBF */
 236 static const value_string sna_th_piubf_vals[] = {
 237         { 0x00, "Single PIU frame" },
 238         { 0x01, "Last PIU of a multiple PIU frame" },
 239         { 0x10, "First PIU of a multiple PIU frame" },
 240         { 0x11, "Middle PIU of a multiple PIU frame" }
 241 };
 242
 243 /* NLPOI */
 244 static const value_string sna_th_nlpoi_vals[] = {
 245         { 0x0, "NLP starts within this FID4 TH" },
 246         { 0x1, "NLP byte 0 starts after RH byte 0 following NLP C/P pad" },
 247 };
 248
 249 /* TPF */
 250 static const value_string sna_th_tpf_vals[] = {
 251         { 0x00, "Low Priority" },
 252         { 0x01, "Medium Priority" },
 253         { 0x10, "High Priority" },
 254 };
 255
 256 /* VR_CWI */
 257 static const value_string sna_th_vr_cwi_vals[] = {
 258         { 0x0, "Increment window size" },
 259         { 0x1, "Decrement window size" },
 260 };
 261
 262 /* TG_NONFIFO_IND */
 263 static const true_false_string sna_th_tg_nonfifo_ind_truth =
 264         { "TG FIFO is not required", "TG FIFO is required" };
 265
 266 /* VR_SQTI */
 267 static const value_string sna_th_vr_sqti_vals[] = {
 268         { 0x00, "Non-sequenced, Non-supervisory" },
 269         { 0x01, "Non-sequenced, Supervisory" },
 270         { 0x10, "Singly-sequenced" },
 271 };
 272
 273 /* VRPRQ */
 274 static const true_false_string sna_th_vrprq_truth = {
 275         "VR pacing request is sent asking for a VR pacing response",
 276         "No VR pacing response is requested",
 277 };
 278
 279 /* VRPRS */
 280 static const true_false_string sna_th_vrprs_truth = {
 281         "VR pacing response is sent in response to a VRPRQ bit set",
 282         "No pacing response sent",
 283 };
 284
 285 /* VR_CWRI */
 286 static const value_string sna_th_vr_cwri_vals[] = {
 287         { 0, "Increment window size by 1" },
 288         { 1, "Decrement window size by 1" },
 289 };
 290
 291 /* VR_RWI */
 292 static const true_false_string sna_th_vr_rwi_truth = {
 293         "Reset window size to the minimum specified in NC_ACTVR",
 294         "Do not reset window size",
 295 };
 296
 297 static int  dissect_fid0_1 (const u_char*, int, frame_data*, proto_tree*);
 298 static int  dissect_fid2 (const u_char*, int, frame_data*, proto_tree*);
 299 static int  dissect_fid3 (const u_char*, int, frame_data*, proto_tree*);
 300 static int  dissect_fid4 (const u_char*, int, frame_data*, proto_tree*);
 301 static int  dissect_fid5 (const u_char*, int, frame_data*, proto_tree*);
 302 static int  dissect_fidf (const u_char*, int, frame_data*, proto_tree*);
 303 static void dissect_rh (const u_char*, int, frame_data*, proto_tree*);
 304
 305 static void
 306 dissect_sna(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 307
 308         proto_tree      *sna_tree = NULL, *th_tree = NULL, *rh_tree = NULL;
 309         proto_item      *sna_ti = NULL, *th_ti = NULL, *rh_ti = NULL;
 310         guint8          th_fid;
 311         int             sna_header_len = 0, th_header_len = 0;
 312
 313         /* SNA data should be printed in EBCDIC, not ASCII */
 314         fd->flags.encoding = CHAR_EBCDIC;
 315
 316         if (IS_DATA_IN_FRAME(offset)) {
 317                 /* Transmission Header Format Identifier */
 318                 th_fid = hi_nibble(pd[offset]);
 319         }
 320         else {
 321                 /* If our first byte isn't here, stop dissecting */
 322                 return;
 323         }
 324
 325         /* Summary information */
 326         if (check_col(fd, COL_PROTOCOL))
 327                 col_add_str(fd, COL_PROTOCOL, "SNA");
 328         if (check_col(fd, COL_INFO))
 329                 col_add_str(fd, COL_INFO, val_to_str(th_fid, sna_th_fid_vals, "Unknown FID: %01x"));
 330
 331         if (tree) {
 332
 333                 /* Don't bother setting length. We'll set it later after we find
 334                  * the lengths of TH/RH/RU */
 335                 sna_ti = proto_tree_add_item(tree, proto_sna, NullTVB, offset, 0, FALSE);
 336                 sna_tree = proto_item_add_subtree(sna_ti, ett_sna);
 337
 338                 /* --- TH --- */
 339                 /* Don't bother setting length. We'll set it later after we find
 340                  * the length of TH */
 341                 th_ti = proto_tree_add_item(sna_tree, hf_sna_th, NullTVB,  offset, 0, FALSE);
 342                 th_tree = proto_item_add_subtree(th_ti, ett_sna_th);
 343         }
 344
 345         /* Get size of TH */
 346         switch(th_fid) {
 347                 case 0x0:
 348                 case 0x1:
 349                         th_header_len = dissect_fid0_1(pd, offset, fd, th_tree);
 350                         break;
 351                 case 0x2:
 352                         th_header_len = dissect_fid2(pd, offset, fd, th_tree);
 353                         break;
 354                 case 0x3:
 355                         th_header_len = dissect_fid3(pd, offset, fd, th_tree);
 356                         break;
 357                 case 0x4:
 358                         th_header_len = dissect_fid4(pd, offset, fd, th_tree);
 359                         break;
 360                 case 0x5:
 361                         th_header_len = dissect_fid5(pd, offset, fd, th_tree);
 362                         break;
 363                 case 0xf:
 364                         th_header_len = dissect_fidf(pd, offset, fd, th_tree);
 365                         break;
 366                 default:
 367                         old_dissect_data(pd, offset+1, fd, tree);
 368         }
 369
 370         sna_header_len += th_header_len;
 371         offset += th_header_len;
 372
 373         if (tree) {
 374                 proto_item_set_len(th_ti, th_header_len);
 375
 376                 /* --- RH --- */
 377                 if (BYTES_ARE_IN_FRAME(offset, 3)) {
 378                         rh_ti = proto_tree_add_item(sna_tree, hf_sna_rh, NullTVB, offset, 3, FALSE);
 379                         rh_tree = proto_item_add_subtree(rh_ti, ett_sna_rh);
 380                         dissect_rh(pd, offset, fd, rh_tree);
 381                         sna_header_len += 3;
 382                         offset += 3;
 383                 }
 384                 else {
 385                         /* If our first byte isn't here, stop dissecting */
 386                         return;
 387                 }
 388
 389                 proto_item_set_len(sna_ti, sna_header_len);
 390         }
 391         else {
 392                 if (BYTES_ARE_IN_FRAME(offset, 3)) {
 393                         sna_header_len += 3;
 394                         offset += 3;
 395                 }
 396
 397         }
 398
 399         if (IS_DATA_IN_FRAME(offset+1)) {
 400                 old_dissect_data(pd, offset, fd, tree);
 401         }
 402 }
 403
 404 /* FID Types 0 and 1 */
 405 static int
 406 dissect_fid0_1 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 407
 408         proto_tree      *bf_tree;
 409         proto_item      *bf_item;
 410         guint8          th_0;
 411         guint16         daf, oaf, snf, dcf;
 412
 413         static int bytes_in_header = 10;
 414
 415         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 416                 return 0;
 417         }
 418
 419         th_0 = pd[offset+0];
 420         daf = pntohs(&pd[offset+2]);
 421         oaf = pntohs(&pd[offset+4]);
 422         snf = pntohs(&pd[offset+6]);
 423         dcf = pntohs(&pd[offset+8]);
 424
 425         SET_ADDRESS(&pi.net_src, AT_SNA, 2, &pd[offset+4]);
 426         SET_ADDRESS(&pi.src, AT_SNA, 2, &pd[offset+4]);
 427         SET_ADDRESS(&pi.net_dst, AT_SNA, 2, &pd[offset+2]);
 428         SET_ADDRESS(&pi.dst, AT_SNA, 2, &pd[offset+2]);
 429
 430         if (!tree) {
 431                 return bytes_in_header;
 432         }
 433
 434         /* Create the bitfield tree */
 435         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_0);
 436         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 437
 438         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_0);
 439         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, NullTVB, offset, 1, th_0);
 440         proto_tree_add_uint(bf_tree, hf_sna_th_efi , NullTVB,offset, 1, th_0);
 441
 442         proto_tree_add_text(tree, NullTVB, offset+1, 1, "Reserved");
 443         proto_tree_add_uint(tree, hf_sna_th_daf , NullTVB,offset+2, 1, daf);
 444         proto_tree_add_uint(tree, hf_sna_th_oaf , NullTVB,offset+4, 1, oaf);
 445         proto_tree_add_uint(tree, hf_sna_th_snf , NullTVB,offset+6, 2, snf);
 446         proto_tree_add_uint(tree, hf_sna_th_dcf , NullTVB,offset+8, 2, dcf);
 447
 448         return bytes_in_header;
 449
 450 }
 451
 452
 453 /* FID Type 2 */
 454 static int
 455 dissect_fid2 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 456
 457         proto_tree      *bf_tree;
 458         proto_item      *bf_item;
 459         guint8          th_0, daf, oaf;
 460         guint16         snf;
 461
 462         static int bytes_in_header = 6;
 463
 464         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 465                 return 0;
 466         }
 467
 468         th_0 = pd[offset+0];
 469         daf = pd[offset+2];
 470         oaf = pd[offset+3];
 471
 472         /* Addresses in FID 2 are FT_UINT8 */
 473         SET_ADDRESS(&pi.net_src, AT_SNA, 1, &pd[offset+3]);
 474         SET_ADDRESS(&pi.src, AT_SNA, 1, &pd[offset+3]);
 475         SET_ADDRESS(&pi.net_dst, AT_SNA, 1, &pd[offset+2]);
 476         SET_ADDRESS(&pi.dst, AT_SNA, 1, &pd[offset+2]);
 477
 478         if (!tree) {
 479                 return bytes_in_header;
 480         }
 481
 482         snf = pntohs(&pd[offset+4]);
 483
 484         /* Create the bitfield tree */
 485         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_0);
 486         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 487
 488         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_0);
 489         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, NullTVB, offset, 1, th_0);
 490         proto_tree_add_uint(bf_tree, hf_sna_th_odai , NullTVB,offset, 1, th_0);
 491         proto_tree_add_uint(bf_tree, hf_sna_th_efi , NullTVB,offset, 1, th_0);
 492
 493         /* Addresses in FID 2 are FT_UINT8 */
 494         proto_tree_add_text(tree, NullTVB, offset+1, 1, "Reserved");
 495         proto_tree_add_uint_format(tree, hf_sna_th_daf , NullTVB,offset+2, 1, daf,
 496                         "Destination Address Field: 0x%02x", daf);
 497         proto_tree_add_uint_format(tree, hf_sna_th_oaf , NullTVB,offset+3, 1, oaf,
 498                         "Origin Address Field: 0x%02x", oaf);
 499         proto_tree_add_uint(tree, hf_sna_th_snf , NullTVB,offset+4, 2, snf);
 500
 501         return bytes_in_header;
 502 }
 503
 504 /* FID Type 3 */
 505 static int
 506 dissect_fid3 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 507
 508         proto_tree      *bf_tree;
 509         proto_item      *bf_item;
 510         guint8          th_0;
 511         guint8          lsid;
 512
 513         static int bytes_in_header = 2;
 514
 515         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 516                 return 0;
 517         }
 518
 519         if (!tree) {
 520                 return bytes_in_header;
 521         }
 522
 523         th_0 = pd[offset+0];
 524         lsid = pd[offset+1];
 525
 526         /* Create the bitfield tree */
 527         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_0);
 528         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 529
 530         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_0);
 531         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, NullTVB, offset, 1, th_0);
 532         proto_tree_add_uint(bf_tree, hf_sna_th_efi , NullTVB,offset, 1, th_0);
 533
 534         proto_tree_add_uint(tree, hf_sna_th_lsid , NullTVB,offset+1, 1, lsid);
 535
 536         return bytes_in_header;
 537 }
 538
 539 /* FID Type 4 */
 540
 541 gchar *
 542 sna_fid_type_4_addr_to_str(const struct sna_fid_type_4_addr *addrp)
 543 {
 544   static gchar  str[3][14];
 545   static gchar  *cur;
 546
 547   if (cur == &str[0][0]) {
 548     cur = &str[1][0];
 549   } else if (cur == &str[1][0]) {
 550     cur = &str[2][0];
 551   } else {
 552     cur = &str[0][0];
 553   }
 554
 555   sprintf(cur, "%08X.%04X", addrp->saf, addrp->ef);
 556   return cur;
 557 }
 558
 559 static int
 560 dissect_fid4 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 561
 562         proto_tree      *bf_tree;
 563         proto_item      *bf_item;
 564         guint8          th_byte, mft;
 565         guint16         th_word;
 566         guint16         def, oef, snf, dcf;
 567         guint32         dsaf, osaf;
 568         static struct sna_fid_type_4_addr src, dst;
 569
 570         static int bytes_in_header = 26;
 571
 572         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 573                 return 0;
 574         }
 575
 576         dsaf = pntohl(&pd[offset+8]);
 577         osaf = pntohl(&pd[offset+12]);
 578         def = pntohs(&pd[offset+18]);
 579         oef = pntohs(&pd[offset+20]);
 580         snf = pntohs(&pd[offset+22]);
 581         dcf = pntohs(&pd[offset+24]);
 582
 583         /* Addresses in FID 4 are discontiguous, sigh */
 584         src.saf = osaf;
 585         src.ef = oef;
 586         dst.saf = dsaf;
 587         dst.ef = def;
 588         SET_ADDRESS(&pi.net_src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 589             (guint8 *)&src);
 590         SET_ADDRESS(&pi.src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 591             (guint8 *)&src);
 592         SET_ADDRESS(&pi.net_dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 593             (guint8 *)&dst);
 594         SET_ADDRESS(&pi.dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 595             (guint8 *)&dst);
 596
 597         if (!tree) {
 598                 return bytes_in_header;
 599         }
 600
 601         th_byte = pd[offset];
 602
 603         /* Create the bitfield tree */
 604         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_byte);
 605         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 606
 607         /* Byte 0 */
 608         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_byte);
 609         proto_tree_add_uint(bf_tree, hf_sna_th_tg_sweep, NullTVB, offset, 1, th_byte);
 610         proto_tree_add_uint(bf_tree, hf_sna_th_er_vr_supp_ind, NullTVB, offset, 1, th_byte);
 611         proto_tree_add_uint(bf_tree, hf_sna_th_vr_pac_cnt_ind, NullTVB, offset, 1, th_byte);
 612         proto_tree_add_uint(bf_tree, hf_sna_th_ntwk_prty, NullTVB, offset, 1, th_byte);
 613
 614         offset += 1;
 615         th_byte = pd[offset];
 616
 617         /* Create the bitfield tree */
 618         bf_item = proto_tree_add_text(tree, NullTVB, offset, 1, "Transmision Header Byte 1");
 619         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 620
 621         /* Byte 1 */
 622         proto_tree_add_uint(bf_tree, hf_sna_th_tgsf, NullTVB, offset, 1, th_byte);
 623         proto_tree_add_boolean(bf_tree, hf_sna_th_mft, NullTVB, offset, 1, th_byte);
 624         proto_tree_add_uint(bf_tree, hf_sna_th_piubf, NullTVB, offset, 1, th_byte);
 625
 626         mft = th_byte & 0x04;
 627         offset += 1;
 628         th_byte = pd[offset];
 629
 630         /* Create the bitfield tree */
 631         bf_item = proto_tree_add_text(tree, NullTVB, offset, 1, "Transmision Header Byte 2");
 632         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 633
 634         /* Byte 2 */
 635         if (mft) {
 636                 proto_tree_add_uint(bf_tree, hf_sna_th_nlpoi, NullTVB, offset, 1, th_byte);
 637                 proto_tree_add_uint(bf_tree, hf_sna_th_nlp_cp, NullTVB, offset, 1, th_byte);
 638         }
 639         else {
 640                 proto_tree_add_uint(bf_tree, hf_sna_th_iern, NullTVB, offset, 1, th_byte);
 641         }
 642         proto_tree_add_uint(bf_tree, hf_sna_th_ern, NullTVB, offset, 1, th_byte);
 643
 644         offset += 1;
 645         th_byte = pd[offset];
 646
 647         /* Create the bitfield tree */
 648         bf_item = proto_tree_add_text(tree, NullTVB, offset, 1, "Transmision Header Byte 3");
 649         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 650
 651         /* Byte 3 */
 652         proto_tree_add_uint(bf_tree, hf_sna_th_vrn, NullTVB, offset, 1, th_byte);
 653         proto_tree_add_uint(bf_tree, hf_sna_th_tpf, NullTVB, offset, 1, th_byte);
 654
 655         offset += 1;
 656         th_word = pntohs(&pd[offset]);
 657
 658         /* Create the bitfield tree */
 659         bf_item = proto_tree_add_text(tree, NullTVB, offset, 2, "Transmision Header Bytes 4-5");
 660         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 661
 662         /* Bytes 4-5 */
 663         proto_tree_add_uint(bf_tree, hf_sna_th_vr_cwi, NullTVB, offset, 2, th_word);
 664         proto_tree_add_boolean(bf_tree, hf_sna_th_tg_nonfifo_ind, NullTVB, offset, 2, th_word);
 665         proto_tree_add_uint(bf_tree, hf_sna_th_vr_sqti, NullTVB, offset, 2, th_word);
 666
 667         /* I'm not sure about byte-order on this one... */
 668         proto_tree_add_uint(bf_tree, hf_sna_th_tg_snf, NullTVB, offset, 2, th_word);
 669
 670         offset += 2;
 671         th_word = pntohs(&pd[offset]);
 672
 673         /* Create the bitfield tree */
 674         bf_item = proto_tree_add_text(tree, NullTVB, offset, 2, "Transmision Header Bytes 6-7");
 675         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 676
 677         /* Bytes 6-7 */
 678         proto_tree_add_boolean(bf_tree, hf_sna_th_vrprq, NullTVB, offset, 2, th_word);
 679         proto_tree_add_boolean(bf_tree, hf_sna_th_vrprs, NullTVB, offset, 2, th_word);
 680         proto_tree_add_uint(bf_tree, hf_sna_th_vr_cwri, NullTVB, offset, 2, th_word);
 681         proto_tree_add_boolean(bf_tree, hf_sna_th_vr_rwi, NullTVB, offset, 2, th_word);
 682
 683         /* I'm not sure about byte-order on this one... */
 684         proto_tree_add_uint(bf_tree, hf_sna_th_vr_snf_send, NullTVB, offset, 2, th_word);
 685
 686         offset += 2;
 687
 688         /* Bytes 8-11 */
 689         proto_tree_add_uint(tree, hf_sna_th_dsaf, NullTVB, offset, 4, dsaf);
 690
 691         offset += 4;
 692
 693         /* Bytes 12-15 */
 694         proto_tree_add_uint(tree, hf_sna_th_osaf, NullTVB, offset, 4, osaf);
 695
 696         offset += 4;
 697         th_byte = pd[offset];
 698
 699         /* Create the bitfield tree */
 700         bf_item = proto_tree_add_text(tree, NullTVB, offset, 2, "Transmision Header Byte 16");
 701         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 702
 703         /* Byte 16 */
 704         proto_tree_add_boolean(tree, hf_sna_th_snai, NullTVB, offset, 1, th_byte);
 705
 706         /* We luck out here because in their infinite wisdom the SNA
 707          * architects placed the MPF and EFI fields in the same bitfield
 708          * locations, even though for FID4 they're not in byte 0.
 709          * Thank you IBM! */
 710         proto_tree_add_uint(tree, hf_sna_th_mpf, NullTVB, offset, 1, th_byte);
 711         proto_tree_add_uint(tree, hf_sna_th_efi, NullTVB, offset, 1, th_byte);
 712
 713         offset += 2; /* 1 for byte 16, 1 for byte 17 which is reserved */
 714
 715         /* Bytes 18-25 */
 716         proto_tree_add_uint(tree, hf_sna_th_def, NullTVB, offset+0, 2, def);
 717         proto_tree_add_uint(tree, hf_sna_th_oef, NullTVB, offset+2, 2, oef);
 718         proto_tree_add_uint(tree, hf_sna_th_snf, NullTVB, offset+4, 2, snf);
 719         proto_tree_add_uint(tree, hf_sna_th_snf, NullTVB, offset+6, 2, dcf);
 720
 721         return bytes_in_header;
 722 }
 723
 724 /* FID Type 5 */
 725 static int
 726 dissect_fid5 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 727
 728         proto_tree      *bf_tree;
 729         proto_item      *bf_item;
 730         guint8          th_0;
 731         guint16         snf;
 732
 733         static int bytes_in_header = 12;
 734
 735         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 736                 return 0;
 737         }
 738
 739         th_0 = pd[offset+0];
 740         snf = pntohs(&pd[offset+2]);
 741
 742         if (!tree) {
 743                 return bytes_in_header;
 744         }
 745
 746         /* Create the bitfield tree */
 747         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_0);
 748         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 749
 750         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_0);
 751         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, NullTVB, offset, 1, th_0);
 752         proto_tree_add_uint(bf_tree, hf_sna_th_efi, NullTVB, offset, 1, th_0);
 753
 754         proto_tree_add_text(tree, NullTVB, offset+1, 1, "Reserved");
 755         proto_tree_add_uint(tree, hf_sna_th_snf, NullTVB, offset+2, 2, snf);
 756
 757         proto_tree_add_bytes(tree, hf_sna_th_sa, NullTVB, offset+4, 8, &pd[offset+4]);
 758
 759         return bytes_in_header;
 760
 761 }
 762
 763 /* FID Type f */
 764 static int
 765 dissect_fidf (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 766
 767         proto_tree      *bf_tree;
 768         proto_item      *bf_item;
 769         guint8          th_0, cmd_fmt, cmd_type;
 770         guint16         cmd_sn, dcf;
 771
 772         static int bytes_in_header = 26;
 773
 774         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 775                 return 0;
 776         }
 777
 778         th_0 = pd[offset+0];
 779         cmd_fmt = pd[offset+2];
 780         cmd_type = pd[offset+3];
 781         cmd_sn = pntohs(&pd[offset+4]);
 782
 783         /* Yup, bytes 6-23 are reserved! */
 784         dcf = pntohs(&pd[offset+24]);
 785
 786         if (!tree) {
 787                 return bytes_in_header;
 788         }
 789
 790         /* Create the bitfield tree */
 791         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_0);
 792         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 793
 794         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_0);
 795         proto_tree_add_text(tree, NullTVB, offset+1, 1, "Reserved");
 796
 797         proto_tree_add_uint(tree, hf_sna_th_cmd_fmt, NullTVB,  offset+2, 1, cmd_fmt);
 798         proto_tree_add_uint(tree, hf_sna_th_cmd_type, NullTVB, offset+3, 1, cmd_type);
 799         proto_tree_add_uint(tree, hf_sna_th_cmd_sn, NullTVB,   offset+4, 2, cmd_sn);
 800
 801         proto_tree_add_text(tree, NullTVB, offset+6, 18, "Reserved");
 802
 803         proto_tree_add_uint(tree, hf_sna_th_dcf, NullTVB, offset+24, 8, dcf);
 804
 805         return bytes_in_header;
 806 }
 807
 808
 809 /* RH */
 810 static void
 811 dissect_rh (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 812
 813         proto_tree      *bf_tree;
 814         proto_item      *bf_item;
 815         gboolean        is_response;
 816         guint8          rh_0, rh_1, rh_2;
 817
 818         rh_0 = pd[offset+0];
 819         rh_1 = pd[offset+1];
 820         rh_2 = pd[offset+2];
 821
 822         is_response = (rh_0 & 0x80);
 823
 824         /* Create the bitfield tree for byte 0*/
 825         bf_item = proto_tree_add_uint(tree, hf_sna_rh_0, NullTVB, offset, 1, rh_0);
 826         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_0);
 827
 828         proto_tree_add_uint(bf_tree, hf_sna_rh_rri, NullTVB, offset, 1, rh_0);
 829         proto_tree_add_uint(bf_tree, hf_sna_rh_ru_category, NullTVB, offset, 1, rh_0);
 830         proto_tree_add_boolean(bf_tree, hf_sna_rh_fi, NullTVB, offset, 1, rh_0);
 831         proto_tree_add_boolean(bf_tree, hf_sna_rh_sdi, NullTVB, offset, 1, rh_0);
 832         proto_tree_add_boolean(bf_tree, hf_sna_rh_bci, NullTVB, offset, 1, rh_0);
 833         proto_tree_add_boolean(bf_tree, hf_sna_rh_eci, NullTVB, offset, 1, rh_0);
 834
 835         offset += 1;
 836
 837         /* Create the bitfield tree for byte 1*/
 838         bf_item = proto_tree_add_uint(tree, hf_sna_rh_1, NullTVB, offset, 1, rh_1);
 839         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_1);
 840
 841         proto_tree_add_boolean(bf_tree, hf_sna_rh_dr1, NullTVB,  offset, 1, rh_1);
 842
 843         if (!is_response) {
 844                 proto_tree_add_boolean(bf_tree, hf_sna_rh_lcci, NullTVB, offset, 1, rh_1);
 845         }
 846
 847         proto_tree_add_boolean(bf_tree, hf_sna_rh_dr2, NullTVB,  offset, 1, rh_1);
 848
 849         if (is_response) {
 850                 proto_tree_add_boolean(bf_tree, hf_sna_rh_rti, NullTVB,  offset, 1, rh_1);
 851         }
 852         else {
 853                 proto_tree_add_boolean(bf_tree, hf_sna_rh_eri, NullTVB,  offset, 1, rh_1);
 854                 proto_tree_add_boolean(bf_tree, hf_sna_rh_rlwi, NullTVB, offset, 1, rh_1);
 855         }
 856
 857         proto_tree_add_boolean(bf_tree, hf_sna_rh_qri, NullTVB, offset, 1, rh_1);
 858         proto_tree_add_boolean(bf_tree, hf_sna_rh_pi, NullTVB,  offset, 1, rh_1);
 859
 860         offset += 1;
 861
 862         /* Create the bitfield tree for byte 2*/
 863         bf_item = proto_tree_add_uint(tree, hf_sna_rh_2, NullTVB, offset, 1, rh_2);
 864
 865         if (!is_response) {
 866                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_2);
 867
 868                 proto_tree_add_boolean(bf_tree, hf_sna_rh_bbi, NullTVB,  offset, 1, rh_2);
 869                 proto_tree_add_boolean(bf_tree, hf_sna_rh_ebi, NullTVB,  offset, 1, rh_2);
 870                 proto_tree_add_boolean(bf_tree, hf_sna_rh_cdi, NullTVB,  offset, 1, rh_2);
 871                 proto_tree_add_boolean(bf_tree, hf_sna_rh_csi, NullTVB,  offset, 1, rh_2);
 872                 proto_tree_add_boolean(bf_tree, hf_sna_rh_edi, NullTVB,  offset, 1, rh_2);
 873                 proto_tree_add_boolean(bf_tree, hf_sna_rh_pdi, NullTVB,  offset, 1, rh_2);
 874                 proto_tree_add_boolean(bf_tree, hf_sna_rh_cebi, NullTVB, offset, 1, rh_2);
 875         }
 876
 877         /* XXX - check for sdi. If TRUE, the next 4 bytes will be sense data */
 878 }
 879
 880 void
 881 proto_register_sna(void)
 882 {
 883         static hf_register_info hf[] = {
 884                 { &hf_sna_th,
 885                 { "Transmission Header",        "sna.th", FT_NONE, BASE_NONE, NULL, 0x0,
 886                         "" }},
 887
 888                 { &hf_sna_th_0,
 889                 { "Transmission Header Byte 0", "sna.th.0", FT_UINT8, BASE_HEX, NULL, 0x0,
 890                         "Byte 0 of Tranmission Header contains FID, MPF, ODAI,"
 891                         " and EFI as bitfields." }},
 892
 893                 { &hf_sna_th_fid,
 894                 { "Format Identifer",           "sna.th.fid", FT_UINT8, BASE_HEX, VALS(sna_th_fid_vals), 0xf0,
 895                         "Format Identification" }},
 896
 897                 { &hf_sna_th_mpf,
 898                 { "Mapping Field",              "sna.th.mpf", FT_UINT8, BASE_NONE, VALS(sna_th_mpf_vals), 0x0c,
 899                         "The Mapping Field specifies whether the information field"
 900                         " associated with the TH is a complete or partial BIU." }},
 901
 902                 { &hf_sna_th_odai,
 903                 { "ODAI Assignment Indicator",  "sna.th.odai", FT_UINT8, BASE_DEC, NULL, 0x02,
 904                         "The ODAI indicates which node assigned the OAF'-DAF' values"
 905                         " carried in the TH." }},
 906
 907                 { &hf_sna_th_efi,
 908                 { "Expedited Flow Indicator",   "sna.th.efi", FT_UINT8, BASE_DEC, VALS(sna_th_efi_vals), 0x01,
 909                         "The EFI designates whether the PIU belongs to the normal"
 910                         " or expedited flow." }},
 911
 912                 { &hf_sna_th_daf,
 913                 { "Destination Address Field",  "sna.th.daf", FT_UINT16, BASE_HEX, NULL, 0x0,
 914                         "" }},
 915
 916                 { &hf_sna_th_oaf,
 917                 { "Origin Address Field",       "sna.th.oaf", FT_UINT16, BASE_HEX, NULL, 0x0,
 918                         "" }},
 919
 920                 { &hf_sna_th_snf,
 921                 { "Sequence Number Field",      "sna.th.snf", FT_UINT16, BASE_NONE, NULL, 0x0,
 922                         "The Sequence Number Field contains a numerical identifier for"
 923                         " the associated BIU."}},
 924
 925                 { &hf_sna_th_dcf,
 926                 { "Data Count Field",   "sna.th.dcf", FT_UINT16, BASE_DEC, NULL, 0x0,
 927                         "A binary count of the number of bytes in the BIU or BIU segment associated "
 928                         "with the tranmission header. The count does not include any of the bytes "
 929                         "in the transmission header."}},
 930
 931                 { &hf_sna_th_lsid,
 932                 { "Local Session Identification",       "sna.th.lsid", FT_UINT8, BASE_HEX, NULL, 0x0,
 933                         "" }},
 934
 935                 { &hf_sna_th_tg_sweep,
 936                 { "Transmission Group Sweep",           "sna.th.tg_sweep", FT_UINT8, BASE_DEC,
 937                         VALS(sna_th_tg_sweep_vals), 0x08,
 938                         "" }},
 939
 940                 { &hf_sna_th_er_vr_supp_ind,
 941                 { "ER and VR Support Indicator",        "sna.th.er_vr_supp_ind", FT_UINT8, BASE_DEC,
 942                         VALS(sna_th_er_vr_supp_ind_vals), 0x04,
 943                         "" }},
 944
 945                 { &hf_sna_th_vr_pac_cnt_ind,
 946                 { "Virtual Route Pacing Count Indicator",       "sna.th.vr_pac_cnt_ind",
 947                         FT_UINT8, BASE_DEC, VALS(sna_th_vr_pac_cnt_ind_vals), 0x02,
 948                         "" }},
 949
 950                 { &hf_sna_th_ntwk_prty,
 951                 { "Network Priority",   "sna.th.ntwk_prty",
 952                         FT_UINT8, BASE_DEC, VALS(sna_th_ntwk_prty_vals), 0x01,
 953                         "" }},
 954
 955                 { &hf_sna_th_tgsf,
 956                 { "Transmission Group Segmenting Field",        "sna.th.tgsf",
 957                         FT_UINT8, BASE_HEX, VALS(sna_th_tgsf_vals), 0xc0,
 958                         "" }},
 959
 960                 { &hf_sna_th_mft,
 961                 { "MPR FID4 Type",      "sna.th.mft", FT_BOOLEAN, BASE_NONE, NULL, 0x04,
 962                         "" }},
 963
 964                 { &hf_sna_th_piubf,
 965                 { "PIU Blocking Field", "sna.th.piubf", FT_UINT8, BASE_HEX,
 966                         VALS(sna_th_piubf_vals), 0x03,
 967                         "Specifies whether this frame contains a single PIU or multiple PIUs." }},
 968
 969                 { &hf_sna_th_iern,
 970                 { "Initial Explicit Route Number",      "sna.th.iern", FT_UINT8, BASE_DEC, NULL, 0xf0,
 971                         "" }},
 972
 973                 { &hf_sna_th_nlpoi,
 974                 { "NLP Offset Indicator",       "sna.th.nlpoi", FT_UINT8, BASE_DEC,
 975                         VALS(sna_th_nlpoi_vals), 0x80,
 976                         "" }},
 977
 978                 { &hf_sna_th_nlp_cp,
 979                 { "NLP Count or Padding",       "sna.th.nlp_cp", FT_UINT8, BASE_DEC, NULL, 0x70,
 980                         "" }},
 981
 982                 { &hf_sna_th_ern,
 983                 { "Explicit Route Number",      "sna.th.ern", FT_UINT8, BASE_DEC, NULL, 0x0f,
 984                         "The ERN in a TH identifies an explicit route direction of flow." }},
 985
 986                 { &hf_sna_th_vrn,
 987                 { "Virtual Route Number",       "sna.th.vrn", FT_UINT8, BASE_DEC, NULL, 0xf0,
 988                         "" }},
 989
 990                 { &hf_sna_th_tpf,
 991                 { "Transmission Priority Field",        "sna.th.tpf", FT_UINT8, BASE_HEX,
 992                         VALS(sna_th_tpf_vals), 0x03,
 993                         "" }},
 994
 995                 { &hf_sna_th_vr_cwi,
 996                 { "Virtual Route Change Window Indicator",      "sna.th.vr_cwi", FT_UINT16, BASE_DEC,
 997                         VALS(sna_th_vr_cwi_vals), 0x8000,
 998                         "Used to change the window size of the virtual route by 1." }},
 999
1000                 { &hf_sna_th_tg_nonfifo_ind,
1001                 { "Transmission Group Non-FIFO Indicator",      "sna.th.tg_nonfifo_ind", FT_BOOLEAN, 16,
1002                         TFS(&sna_th_tg_nonfifo_ind_truth), 0x4000,
1003                         "Indicates whether or not FIFO discipline is to enforced in "
1004                         "transmitting PIUs through the tranmission groups to prevent the PIUs "
1005                         "getting out of sequence during transmission over the TGs." }},
1006
1007                 { &hf_sna_th_vr_sqti,
1008                 { "Virtual Route Sequence and Type Indicator",  "sna.th.vr_sqti", FT_UINT16, BASE_HEX,
1009                         VALS(sna_th_vr_sqti_vals), 0x3000,
1010                         "Specifies the PIU type." }},
1011
1012                 { &hf_sna_th_tg_snf,
1013                 { "Transmission Group Sequence Number Field",   "sna.th.tg_snf", FT_UINT16, BASE_DEC,
1014                         NULL, 0x0fff,
1015                         "" }},
1016
1017                 { &hf_sna_th_vrprq,
1018                 { "Virtual Route Pacing Request",       "sna.th.vrprq", FT_BOOLEAN, 16,
1019                         TFS(&sna_th_vrprq_truth), 0x8000,
1020                         "" }},
1021
1022                 { &hf_sna_th_vrprs,
1023                 { "Virtual Route Pacing Response",      "sna.th.vrprs", FT_BOOLEAN, 16,
1024                         TFS(&sna_th_vrprs_truth), 0x4000,
1025                         "" }},
1026
1027                 { &hf_sna_th_vr_cwri,
1028                 { "Virtual Route Change Window Reply Indicator",        "sna.th.vr_cwri", FT_UINT16, BASE_DEC,
1029                         VALS(sna_th_vr_cwri_vals), 0x2000,
1030                         "Permits changing of the window size by 1 for PIUs received by the "
1031                         "sender of this bit." }},
1032
1033                 { &hf_sna_th_vr_rwi,
1034                 { "Virtual Route Reset Window Indicator",       "sna.th.vr_rwi", FT_BOOLEAN, 16,
1035                         TFS(&sna_th_vr_rwi_truth), 0x1000,
1036                         "Indicates severe congestion in a node on the virtual route." }},
1037
1038                 { &hf_sna_th_vr_snf_send,
1039                 { "Virtual Route Send Sequence Number Field",   "sna.th.vr_snf_send", FT_UINT16, BASE_DEC,
1040                         NULL, 0x0fff,
1041                         "" }},
1042
1043                 { &hf_sna_th_dsaf,
1044                 { "Destination Subarea Address Field",  "sna.th.dsaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1045                         "" }},
1046
1047                 { &hf_sna_th_osaf,
1048                 { "Origin Subarea Address Field",       "sna.th.osaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1049                         "" }},
1050
1051                 { &hf_sna_th_snai,
1052                 { "SNA Indicator",      "sna.th.snai", FT_BOOLEAN, 8, NULL, 0x10,
1053                         "Used to identify whether the PIU originated or is destined for "
1054                         "an SNA or non-SNA device." }},
1055
1056                 { &hf_sna_th_def,
1057                 { "Destination Element Field",  "sna.th.def", FT_UINT16, BASE_HEX, NULL, 0x0,
1058                         "" }},
1059
1060                 { &hf_sna_th_oef,
1061                 { "Origin Element Field",       "sna.th.oef", FT_UINT16, BASE_HEX, NULL, 0x0,
1062                         "" }},
1063
1064                 { &hf_sna_th_sa,
1065                 { "Session Address",    "sna.th.sa", FT_BYTES, BASE_HEX, NULL, 0x0,
1066                         "" }},
1067
1068                 { &hf_sna_th_cmd_fmt,
1069                 { "Command Format",     "sna.th.cmd_fmt", FT_UINT8, BASE_HEX, NULL, 0x0,
1070                         "" }},
1071
1072                 { &hf_sna_th_cmd_type,
1073                 { "Command Type",       "sna.th.cmd_type", FT_UINT8, BASE_HEX, NULL, 0x0,
1074                         "" }},
1075
1076                 { &hf_sna_th_cmd_sn,
1077                 { "Command Sequence Number",    "sna.th.cmd_sn", FT_UINT16, BASE_DEC, NULL, 0x0,
1078                         "" }},
1079
1080
1081                 { &hf_sna_rh,
1082                 { "Request/Response Header",    "sna.rh", FT_NONE, BASE_NONE, NULL, 0x0,
1083                         "" }},
1084
1085                 { &hf_sna_rh_0,
1086                 { "Request/Response Header Byte 0",     "sna.rh.0", FT_UINT8, BASE_HEX, NULL, 0x0,
1087                         "" }},
1088
1089                 { &hf_sna_rh_1,
1090                 { "Request/Response Header Byte 1",     "sna.rh.1", FT_UINT8, BASE_HEX, NULL, 0x0,
1091                         "" }},
1092
1093                 { &hf_sna_rh_2,
1094                 { "Request/Response Header Byte 2",     "sna.rh.2", FT_UINT8, BASE_HEX, NULL, 0x0,
1095                         "" }},
1096
1097                 { &hf_sna_rh_rri,
1098                 { "Request/Response Indicator", "sna.rh.rri", FT_UINT8, BASE_DEC, VALS(sna_rh_rri_vals), 0x80,
1099                         "Denotes whether this is a request or a response." }},
1100
1101                 { &hf_sna_rh_ru_category,
1102                 { "Request/Response Unit Category",     "sna.rh.ru_category", FT_UINT8, BASE_HEX,
1103                         VALS(sna_rh_ru_category_vals), 0x60,
1104                         "" }},
1105
1106                 { &hf_sna_rh_fi,
1107                 { "Format Indicator",           "sna.rh.fi", FT_BOOLEAN, 8, TFS(&sna_rh_fi_truth), 0x08,
1108                         "" }},
1109
1110                 { &hf_sna_rh_sdi,
1111                 { "Sense Data Included",        "sna.rh.sdi", FT_BOOLEAN, 8, TFS(&sna_rh_sdi_truth), 0x04,
1112                         "Indicates that a 4-byte sense data field is included in the associated RU." }},
1113
1114                 { &hf_sna_rh_bci,
1115                 { "Begin Chain Indicator",      "sna.rh.bci", FT_BOOLEAN, 8, TFS(&sna_rh_bci_truth), 0x02,
1116                         "" }},
1117
1118                 { &hf_sna_rh_eci,
1119                 { "End Chain Indicator",        "sna.rh.eci", FT_BOOLEAN, 8, TFS(&sna_rh_eci_truth), 0x01,
1120                         "" }},
1121
1122                 { &hf_sna_rh_dr1,
1123                 { "Definite Response 1 Indicator",      "sna.rh.dr1", FT_BOOLEAN, 8, NULL, 0x80,
1124                         "" }},
1125
1126                 { &hf_sna_rh_lcci,
1127                 { "Length-Checked Compression Indicator",       "sna.rh.lcci", FT_BOOLEAN, 8,
1128                         TFS(&sna_rh_lcci_truth), 0x40,
1129                         "" }},
1130
1131                 { &hf_sna_rh_dr2,
1132                 { "Definite Response 2 Indicator",      "sna.rh.dr2", FT_BOOLEAN, 8, NULL, 0x20,
1133                         "" }},
1134
1135                 { &hf_sna_rh_eri,
1136                 { "Exception Response Indicator",       "sna.rh.eri", FT_BOOLEAN, 8, NULL, 0x10,
1137                         "Used in conjunction with DR1I and DR2I to indicate, in a request, "
1138                         "the form of response requested." }},
1139
1140                 { &hf_sna_rh_rti,
1141                 { "Response Type Indicator",    "sna.rh.rti", FT_BOOLEAN, 8, TFS(&sna_rh_rti_truth), 0x10,
1142                         "" }},
1143
1144                 { &hf_sna_rh_rlwi,
1145                 { "Request Larger Window Indicator",    "sna.rh.rlwi", FT_BOOLEAN, 8, NULL, 0x04,
1146                         "Indicates whether a larger pacing window was requested." }},
1147
1148                 { &hf_sna_rh_qri,
1149                 { "Queued Response Indicator",  "sna.rh.qri", FT_BOOLEAN, 8, TFS(&sna_rh_qri_truth), 0x02,
1150                         "" }},
1151
1152                 { &hf_sna_rh_pi,
1153                 { "Pacing Indicator",   "sna.rh.pi", FT_BOOLEAN, 8, NULL, 0x01,
1154                         "" }},
1155
1156                 { &hf_sna_rh_bbi,
1157                 { "Begin Bracket Indicator",    "sna.rh.bbi", FT_BOOLEAN, 8, NULL, 0x80,
1158                         "" }},
1159
1160                 { &hf_sna_rh_ebi,
1161                 { "End Bracket Indicator",      "sna.rh.ebi", FT_BOOLEAN, 8, NULL, 0x40,
1162                         "" }},
1163
1164                 { &hf_sna_rh_cdi,
1165                 { "Change Direction Indicator", "sna.rh.cdi", FT_BOOLEAN, 8, NULL, 0x20,
1166                         "" }},
1167
1168                 { &hf_sna_rh_csi,
1169                 { "Code Selection Indicator",   "sna.rh.csi", FT_BOOLEAN, 8, VALS(sna_rh_csi_vals), 0x08,
1170                         "Specifies the encoding used for the associated FMD RU." }},
1171
1172                 { &hf_sna_rh_edi,
1173                 { "Enciphered Data Indicator",  "sna.rh.edi", FT_BOOLEAN, 8, NULL, 0x04,
1174                         "Indicates that information in the associated RU is enciphered under "
1175                         "session-level cryptography protocols." }},
1176
1177                 { &hf_sna_rh_pdi,
1178                 { "Padded Data Indicator",      "sna.rh.pdi", FT_BOOLEAN, 8, NULL, 0x02,
1179                         "Indicates that the RU was padded at the end, before encipherment, to the next "
1180                         "integral multiple of 8 bytes." }},
1181
1182                 { &hf_sna_rh_cebi,
1183                 { "Conditional End Bracket Indicator",  "sna.rh.cebi", FT_BOOLEAN, 8, NULL, 0x01,
1184                         "Used to indicate the beginning or end of a group of exchanged "
1185                         "requests and responses called a bracket. Only used on LU-LU sessions." }},
1186
1187                 { &hf_sna_ru,
1188                 { "Request/Response Unit",      "sna.ru", FT_NONE, BASE_NONE, NULL, 0x0,
1189                         ""}},
1190         };
1191         static gint *ett[] = {
1192                 &ett_sna,
1193                 &ett_sna_th,
1194                 &ett_sna_th_fid,
1195                 &ett_sna_rh,
1196                 &ett_sna_rh_0,
1197                 &ett_sna_rh_1,
1198                 &ett_sna_rh_2,
1199         };
1200
1201         proto_sna = proto_register_protocol("Systems Network Architecture", "sna");
1202         proto_register_field_array(proto_sna, hf, array_length(hf));
1203         proto_register_subtree_array(ett, array_length(ett));
1204 }
1205
1206 void
1207 proto_reg_handoff_sna(void)
1208 {
1209         old_dissector_add("llc.dsap", SAP_SNA_PATHCTRL, dissect_sna);
1210 }