packet-sna.c

   1 /* packet-sna.c
   2  * Routines for SNA
   3  * Gilbert Ramirez <gram@xiexie.org>
   4  *
   5  * $Id: packet-sna.c,v 1.19 2000/11/19 08:54:07 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         OLD_CHECK_DISPLAY_AS_DATA(proto_sna, pd, offset, fd, tree);
 314
 315         /* SNA data should be printed in EBCDIC, not ASCII */
 316         fd->flags.encoding = CHAR_EBCDIC;
 317
 318         if (IS_DATA_IN_FRAME(offset)) {
 319                 /* Transmission Header Format Identifier */
 320                 th_fid = hi_nibble(pd[offset]);
 321         }
 322         else {
 323                 /* If our first byte isn't here, stop dissecting */
 324                 return;
 325         }
 326
 327         /* Summary information */
 328         if (check_col(fd, COL_PROTOCOL))
 329                 col_set_str(fd, COL_PROTOCOL, "SNA");
 330         if (check_col(fd, COL_INFO))
 331                 col_add_str(fd, COL_INFO, val_to_str(th_fid, sna_th_fid_vals, "Unknown FID: %01x"));
 332
 333         if (tree) {
 334
 335                 /* Don't bother setting length. We'll set it later after we find
 336                  * the lengths of TH/RH/RU */
 337                 sna_ti = proto_tree_add_item(tree, proto_sna, NullTVB, offset, 0, FALSE);
 338                 sna_tree = proto_item_add_subtree(sna_ti, ett_sna);
 339
 340                 /* --- TH --- */
 341                 /* Don't bother setting length. We'll set it later after we find
 342                  * the length of TH */
 343                 th_ti = proto_tree_add_item(sna_tree, hf_sna_th, NullTVB,  offset, 0, FALSE);
 344                 th_tree = proto_item_add_subtree(th_ti, ett_sna_th);
 345         }
 346
 347         /* Get size of TH */
 348         switch(th_fid) {
 349                 case 0x0:
 350                 case 0x1:
 351                         th_header_len = dissect_fid0_1(pd, offset, fd, th_tree);
 352                         break;
 353                 case 0x2:
 354                         th_header_len = dissect_fid2(pd, offset, fd, th_tree);
 355                         break;
 356                 case 0x3:
 357                         th_header_len = dissect_fid3(pd, offset, fd, th_tree);
 358                         break;
 359                 case 0x4:
 360                         th_header_len = dissect_fid4(pd, offset, fd, th_tree);
 361                         break;
 362                 case 0x5:
 363                         th_header_len = dissect_fid5(pd, offset, fd, th_tree);
 364                         break;
 365                 case 0xf:
 366                         th_header_len = dissect_fidf(pd, offset, fd, th_tree);
 367                         break;
 368                 default:
 369                         old_dissect_data(pd, offset+1, fd, tree);
 370         }
 371
 372         sna_header_len += th_header_len;
 373         offset += th_header_len;
 374
 375         if (tree) {
 376                 proto_item_set_len(th_ti, th_header_len);
 377
 378                 /* --- RH --- */
 379                 if (BYTES_ARE_IN_FRAME(offset, 3)) {
 380                         rh_ti = proto_tree_add_item(sna_tree, hf_sna_rh, NullTVB, offset, 3, FALSE);
 381                         rh_tree = proto_item_add_subtree(rh_ti, ett_sna_rh);
 382                         dissect_rh(pd, offset, fd, rh_tree);
 383                         sna_header_len += 3;
 384                         offset += 3;
 385                 }
 386                 else {
 387                         /* If our first byte isn't here, stop dissecting */
 388                         return;
 389                 }
 390
 391                 proto_item_set_len(sna_ti, sna_header_len);
 392         }
 393         else {
 394                 if (BYTES_ARE_IN_FRAME(offset, 3)) {
 395                         sna_header_len += 3;
 396                         offset += 3;
 397                 }
 398
 399         }
 400
 401         if (IS_DATA_IN_FRAME(offset+1)) {
 402                 old_dissect_data(pd, offset, fd, tree);
 403         }
 404 }
 405
 406 /* FID Types 0 and 1 */
 407 static int
 408 dissect_fid0_1 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 409
 410         proto_tree      *bf_tree;
 411         proto_item      *bf_item;
 412         guint8          th_0;
 413         guint16         daf, oaf, snf, dcf;
 414
 415         static int bytes_in_header = 10;
 416
 417         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 418                 return 0;
 419         }
 420
 421         th_0 = pd[offset+0];
 422         daf = pntohs(&pd[offset+2]);
 423         oaf = pntohs(&pd[offset+4]);
 424         snf = pntohs(&pd[offset+6]);
 425         dcf = pntohs(&pd[offset+8]);
 426
 427         SET_ADDRESS(&pi.net_src, AT_SNA, 2, &pd[offset+4]);
 428         SET_ADDRESS(&pi.src, AT_SNA, 2, &pd[offset+4]);
 429         SET_ADDRESS(&pi.net_dst, AT_SNA, 2, &pd[offset+2]);
 430         SET_ADDRESS(&pi.dst, AT_SNA, 2, &pd[offset+2]);
 431
 432         if (!tree) {
 433                 return bytes_in_header;
 434         }
 435
 436         /* Create the bitfield tree */
 437         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_0);
 438         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 439
 440         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_0);
 441         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, NullTVB, offset, 1, th_0);
 442         proto_tree_add_uint(bf_tree, hf_sna_th_efi , NullTVB,offset, 1, th_0);
 443
 444         proto_tree_add_text(tree, NullTVB, offset+1, 1, "Reserved");
 445         proto_tree_add_uint(tree, hf_sna_th_daf , NullTVB,offset+2, 1, daf);
 446         proto_tree_add_uint(tree, hf_sna_th_oaf , NullTVB,offset+4, 1, oaf);
 447         proto_tree_add_uint(tree, hf_sna_th_snf , NullTVB,offset+6, 2, snf);
 448         proto_tree_add_uint(tree, hf_sna_th_dcf , NullTVB,offset+8, 2, dcf);
 449
 450         return bytes_in_header;
 451
 452 }
 453
 454
 455 /* FID Type 2 */
 456 static int
 457 dissect_fid2 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 458
 459         proto_tree      *bf_tree;
 460         proto_item      *bf_item;
 461         guint8          th_0, daf, oaf;
 462         guint16         snf;
 463
 464         static int bytes_in_header = 6;
 465
 466         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 467                 return 0;
 468         }
 469
 470         th_0 = pd[offset+0];
 471         daf = pd[offset+2];
 472         oaf = pd[offset+3];
 473
 474         /* Addresses in FID 2 are FT_UINT8 */
 475         SET_ADDRESS(&pi.net_src, AT_SNA, 1, &pd[offset+3]);
 476         SET_ADDRESS(&pi.src, AT_SNA, 1, &pd[offset+3]);
 477         SET_ADDRESS(&pi.net_dst, AT_SNA, 1, &pd[offset+2]);
 478         SET_ADDRESS(&pi.dst, AT_SNA, 1, &pd[offset+2]);
 479
 480         if (!tree) {
 481                 return bytes_in_header;
 482         }
 483
 484         snf = pntohs(&pd[offset+4]);
 485
 486         /* Create the bitfield tree */
 487         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_0);
 488         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 489
 490         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_0);
 491         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, NullTVB, offset, 1, th_0);
 492         proto_tree_add_uint(bf_tree, hf_sna_th_odai , NullTVB,offset, 1, th_0);
 493         proto_tree_add_uint(bf_tree, hf_sna_th_efi , NullTVB,offset, 1, th_0);
 494
 495         /* Addresses in FID 2 are FT_UINT8 */
 496         proto_tree_add_text(tree, NullTVB, offset+1, 1, "Reserved");
 497         proto_tree_add_uint_format(tree, hf_sna_th_daf , NullTVB,offset+2, 1, daf,
 498                         "Destination Address Field: 0x%02x", daf);
 499         proto_tree_add_uint_format(tree, hf_sna_th_oaf , NullTVB,offset+3, 1, oaf,
 500                         "Origin Address Field: 0x%02x", oaf);
 501         proto_tree_add_uint(tree, hf_sna_th_snf , NullTVB,offset+4, 2, snf);
 502
 503         return bytes_in_header;
 504 }
 505
 506 /* FID Type 3 */
 507 static int
 508 dissect_fid3 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 509
 510         proto_tree      *bf_tree;
 511         proto_item      *bf_item;
 512         guint8          th_0;
 513         guint8          lsid;
 514
 515         static int bytes_in_header = 2;
 516
 517         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 518                 return 0;
 519         }
 520
 521         if (!tree) {
 522                 return bytes_in_header;
 523         }
 524
 525         th_0 = pd[offset+0];
 526         lsid = pd[offset+1];
 527
 528         /* Create the bitfield tree */
 529         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_0);
 530         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 531
 532         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_0);
 533         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, NullTVB, offset, 1, th_0);
 534         proto_tree_add_uint(bf_tree, hf_sna_th_efi , NullTVB,offset, 1, th_0);
 535
 536         proto_tree_add_uint(tree, hf_sna_th_lsid , NullTVB,offset+1, 1, lsid);
 537
 538         return bytes_in_header;
 539 }
 540
 541 /* FID Type 4 */
 542
 543 gchar *
 544 sna_fid_type_4_addr_to_str(const struct sna_fid_type_4_addr *addrp)
 545 {
 546   static gchar  str[3][14];
 547   static gchar  *cur;
 548
 549   if (cur == &str[0][0]) {
 550     cur = &str[1][0];
 551   } else if (cur == &str[1][0]) {
 552     cur = &str[2][0];
 553   } else {
 554     cur = &str[0][0];
 555   }
 556
 557   sprintf(cur, "%08X.%04X", addrp->saf, addrp->ef);
 558   return cur;
 559 }
 560
 561 static int
 562 dissect_fid4 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 563
 564         proto_tree      *bf_tree;
 565         proto_item      *bf_item;
 566         guint8          th_byte, mft;
 567         guint16         th_word;
 568         guint16         def, oef, snf, dcf;
 569         guint32         dsaf, osaf;
 570         static struct sna_fid_type_4_addr src, dst;
 571
 572         static int bytes_in_header = 26;
 573
 574         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 575                 return 0;
 576         }
 577
 578         dsaf = pntohl(&pd[offset+8]);
 579         osaf = pntohl(&pd[offset+12]);
 580         def = pntohs(&pd[offset+18]);
 581         oef = pntohs(&pd[offset+20]);
 582         snf = pntohs(&pd[offset+22]);
 583         dcf = pntohs(&pd[offset+24]);
 584
 585         /* Addresses in FID 4 are discontiguous, sigh */
 586         src.saf = osaf;
 587         src.ef = oef;
 588         dst.saf = dsaf;
 589         dst.ef = def;
 590         SET_ADDRESS(&pi.net_src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 591             (guint8 *)&src);
 592         SET_ADDRESS(&pi.src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 593             (guint8 *)&src);
 594         SET_ADDRESS(&pi.net_dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 595             (guint8 *)&dst);
 596         SET_ADDRESS(&pi.dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN,
 597             (guint8 *)&dst);
 598
 599         if (!tree) {
 600                 return bytes_in_header;
 601         }
 602
 603         th_byte = pd[offset];
 604
 605         /* Create the bitfield tree */
 606         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_byte);
 607         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 608
 609         /* Byte 0 */
 610         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_byte);
 611         proto_tree_add_uint(bf_tree, hf_sna_th_tg_sweep, NullTVB, offset, 1, th_byte);
 612         proto_tree_add_uint(bf_tree, hf_sna_th_er_vr_supp_ind, NullTVB, offset, 1, th_byte);
 613         proto_tree_add_uint(bf_tree, hf_sna_th_vr_pac_cnt_ind, NullTVB, offset, 1, th_byte);
 614         proto_tree_add_uint(bf_tree, hf_sna_th_ntwk_prty, NullTVB, offset, 1, th_byte);
 615
 616         offset += 1;
 617         th_byte = pd[offset];
 618
 619         /* Create the bitfield tree */
 620         bf_item = proto_tree_add_text(tree, NullTVB, offset, 1, "Transmision Header Byte 1");
 621         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 622
 623         /* Byte 1 */
 624         proto_tree_add_uint(bf_tree, hf_sna_th_tgsf, NullTVB, offset, 1, th_byte);
 625         proto_tree_add_boolean(bf_tree, hf_sna_th_mft, NullTVB, offset, 1, th_byte);
 626         proto_tree_add_uint(bf_tree, hf_sna_th_piubf, NullTVB, offset, 1, th_byte);
 627
 628         mft = th_byte & 0x04;
 629         offset += 1;
 630         th_byte = pd[offset];
 631
 632         /* Create the bitfield tree */
 633         bf_item = proto_tree_add_text(tree, NullTVB, offset, 1, "Transmision Header Byte 2");
 634         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 635
 636         /* Byte 2 */
 637         if (mft) {
 638                 proto_tree_add_uint(bf_tree, hf_sna_th_nlpoi, NullTVB, offset, 1, th_byte);
 639                 proto_tree_add_uint(bf_tree, hf_sna_th_nlp_cp, NullTVB, offset, 1, th_byte);
 640         }
 641         else {
 642                 proto_tree_add_uint(bf_tree, hf_sna_th_iern, NullTVB, offset, 1, th_byte);
 643         }
 644         proto_tree_add_uint(bf_tree, hf_sna_th_ern, NullTVB, offset, 1, th_byte);
 645
 646         offset += 1;
 647         th_byte = pd[offset];
 648
 649         /* Create the bitfield tree */
 650         bf_item = proto_tree_add_text(tree, NullTVB, offset, 1, "Transmision Header Byte 3");
 651         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 652
 653         /* Byte 3 */
 654         proto_tree_add_uint(bf_tree, hf_sna_th_vrn, NullTVB, offset, 1, th_byte);
 655         proto_tree_add_uint(bf_tree, hf_sna_th_tpf, NullTVB, offset, 1, th_byte);
 656
 657         offset += 1;
 658         th_word = pntohs(&pd[offset]);
 659
 660         /* Create the bitfield tree */
 661         bf_item = proto_tree_add_text(tree, NullTVB, offset, 2, "Transmision Header Bytes 4-5");
 662         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 663
 664         /* Bytes 4-5 */
 665         proto_tree_add_uint(bf_tree, hf_sna_th_vr_cwi, NullTVB, offset, 2, th_word);
 666         proto_tree_add_boolean(bf_tree, hf_sna_th_tg_nonfifo_ind, NullTVB, offset, 2, th_word);
 667         proto_tree_add_uint(bf_tree, hf_sna_th_vr_sqti, NullTVB, offset, 2, th_word);
 668
 669         /* I'm not sure about byte-order on this one... */
 670         proto_tree_add_uint(bf_tree, hf_sna_th_tg_snf, NullTVB, offset, 2, th_word);
 671
 672         offset += 2;
 673         th_word = pntohs(&pd[offset]);
 674
 675         /* Create the bitfield tree */
 676         bf_item = proto_tree_add_text(tree, NullTVB, offset, 2, "Transmision Header Bytes 6-7");
 677         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 678
 679         /* Bytes 6-7 */
 680         proto_tree_add_boolean(bf_tree, hf_sna_th_vrprq, NullTVB, offset, 2, th_word);
 681         proto_tree_add_boolean(bf_tree, hf_sna_th_vrprs, NullTVB, offset, 2, th_word);
 682         proto_tree_add_uint(bf_tree, hf_sna_th_vr_cwri, NullTVB, offset, 2, th_word);
 683         proto_tree_add_boolean(bf_tree, hf_sna_th_vr_rwi, NullTVB, offset, 2, th_word);
 684
 685         /* I'm not sure about byte-order on this one... */
 686         proto_tree_add_uint(bf_tree, hf_sna_th_vr_snf_send, NullTVB, offset, 2, th_word);
 687
 688         offset += 2;
 689
 690         /* Bytes 8-11 */
 691         proto_tree_add_uint(tree, hf_sna_th_dsaf, NullTVB, offset, 4, dsaf);
 692
 693         offset += 4;
 694
 695         /* Bytes 12-15 */
 696         proto_tree_add_uint(tree, hf_sna_th_osaf, NullTVB, offset, 4, osaf);
 697
 698         offset += 4;
 699         th_byte = pd[offset];
 700
 701         /* Create the bitfield tree */
 702         bf_item = proto_tree_add_text(tree, NullTVB, offset, 2, "Transmision Header Byte 16");
 703         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 704
 705         /* Byte 16 */
 706         proto_tree_add_boolean(tree, hf_sna_th_snai, NullTVB, offset, 1, th_byte);
 707
 708         /* We luck out here because in their infinite wisdom the SNA
 709          * architects placed the MPF and EFI fields in the same bitfield
 710          * locations, even though for FID4 they're not in byte 0.
 711          * Thank you IBM! */
 712         proto_tree_add_uint(tree, hf_sna_th_mpf, NullTVB, offset, 1, th_byte);
 713         proto_tree_add_uint(tree, hf_sna_th_efi, NullTVB, offset, 1, th_byte);
 714
 715         offset += 2; /* 1 for byte 16, 1 for byte 17 which is reserved */
 716
 717         /* Bytes 18-25 */
 718         proto_tree_add_uint(tree, hf_sna_th_def, NullTVB, offset+0, 2, def);
 719         proto_tree_add_uint(tree, hf_sna_th_oef, NullTVB, offset+2, 2, oef);
 720         proto_tree_add_uint(tree, hf_sna_th_snf, NullTVB, offset+4, 2, snf);
 721         proto_tree_add_uint(tree, hf_sna_th_snf, NullTVB, offset+6, 2, dcf);
 722
 723         return bytes_in_header;
 724 }
 725
 726 /* FID Type 5 */
 727 static int
 728 dissect_fid5 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 729
 730         proto_tree      *bf_tree;
 731         proto_item      *bf_item;
 732         guint8          th_0;
 733         guint16         snf;
 734
 735         static int bytes_in_header = 12;
 736
 737         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 738                 return 0;
 739         }
 740
 741         th_0 = pd[offset+0];
 742         snf = pntohs(&pd[offset+2]);
 743
 744         if (!tree) {
 745                 return bytes_in_header;
 746         }
 747
 748         /* Create the bitfield tree */
 749         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_0);
 750         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 751
 752         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_0);
 753         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, NullTVB, offset, 1, th_0);
 754         proto_tree_add_uint(bf_tree, hf_sna_th_efi, NullTVB, offset, 1, th_0);
 755
 756         proto_tree_add_text(tree, NullTVB, offset+1, 1, "Reserved");
 757         proto_tree_add_uint(tree, hf_sna_th_snf, NullTVB, offset+2, 2, snf);
 758
 759         proto_tree_add_bytes(tree, hf_sna_th_sa, NullTVB, offset+4, 8, &pd[offset+4]);
 760
 761         return bytes_in_header;
 762
 763 }
 764
 765 /* FID Type f */
 766 static int
 767 dissect_fidf (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 768
 769         proto_tree      *bf_tree;
 770         proto_item      *bf_item;
 771         guint8          th_0, cmd_fmt, cmd_type;
 772         guint16         cmd_sn, dcf;
 773
 774         static int bytes_in_header = 26;
 775
 776         if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
 777                 return 0;
 778         }
 779
 780         th_0 = pd[offset+0];
 781         cmd_fmt = pd[offset+2];
 782         cmd_type = pd[offset+3];
 783         cmd_sn = pntohs(&pd[offset+4]);
 784
 785         /* Yup, bytes 6-23 are reserved! */
 786         dcf = pntohs(&pd[offset+24]);
 787
 788         if (!tree) {
 789                 return bytes_in_header;
 790         }
 791
 792         /* Create the bitfield tree */
 793         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, NullTVB, offset, 1, th_0);
 794         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 795
 796         proto_tree_add_uint(bf_tree, hf_sna_th_fid, NullTVB, offset, 1, th_0);
 797         proto_tree_add_text(tree, NullTVB, offset+1, 1, "Reserved");
 798
 799         proto_tree_add_uint(tree, hf_sna_th_cmd_fmt, NullTVB,  offset+2, 1, cmd_fmt);
 800         proto_tree_add_uint(tree, hf_sna_th_cmd_type, NullTVB, offset+3, 1, cmd_type);
 801         proto_tree_add_uint(tree, hf_sna_th_cmd_sn, NullTVB,   offset+4, 2, cmd_sn);
 802
 803         proto_tree_add_text(tree, NullTVB, offset+6, 18, "Reserved");
 804
 805         proto_tree_add_uint(tree, hf_sna_th_dcf, NullTVB, offset+24, 8, dcf);
 806
 807         return bytes_in_header;
 808 }
 809
 810
 811 /* RH */
 812 static void
 813 dissect_rh (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 814
 815         proto_tree      *bf_tree;
 816         proto_item      *bf_item;
 817         gboolean        is_response;
 818         guint8          rh_0, rh_1, rh_2;
 819
 820         rh_0 = pd[offset+0];
 821         rh_1 = pd[offset+1];
 822         rh_2 = pd[offset+2];
 823
 824         is_response = (rh_0 & 0x80);
 825
 826         /* Create the bitfield tree for byte 0*/
 827         bf_item = proto_tree_add_uint(tree, hf_sna_rh_0, NullTVB, offset, 1, rh_0);
 828         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_0);
 829
 830         proto_tree_add_uint(bf_tree, hf_sna_rh_rri, NullTVB, offset, 1, rh_0);
 831         proto_tree_add_uint(bf_tree, hf_sna_rh_ru_category, NullTVB, offset, 1, rh_0);
 832         proto_tree_add_boolean(bf_tree, hf_sna_rh_fi, NullTVB, offset, 1, rh_0);
 833         proto_tree_add_boolean(bf_tree, hf_sna_rh_sdi, NullTVB, offset, 1, rh_0);
 834         proto_tree_add_boolean(bf_tree, hf_sna_rh_bci, NullTVB, offset, 1, rh_0);
 835         proto_tree_add_boolean(bf_tree, hf_sna_rh_eci, NullTVB, offset, 1, rh_0);
 836
 837         offset += 1;
 838
 839         /* Create the bitfield tree for byte 1*/
 840         bf_item = proto_tree_add_uint(tree, hf_sna_rh_1, NullTVB, offset, 1, rh_1);
 841         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_1);
 842
 843         proto_tree_add_boolean(bf_tree, hf_sna_rh_dr1, NullTVB,  offset, 1, rh_1);
 844
 845         if (!is_response) {
 846                 proto_tree_add_boolean(bf_tree, hf_sna_rh_lcci, NullTVB, offset, 1, rh_1);
 847         }
 848
 849         proto_tree_add_boolean(bf_tree, hf_sna_rh_dr2, NullTVB,  offset, 1, rh_1);
 850
 851         if (is_response) {
 852                 proto_tree_add_boolean(bf_tree, hf_sna_rh_rti, NullTVB,  offset, 1, rh_1);
 853         }
 854         else {
 855                 proto_tree_add_boolean(bf_tree, hf_sna_rh_eri, NullTVB,  offset, 1, rh_1);
 856                 proto_tree_add_boolean(bf_tree, hf_sna_rh_rlwi, NullTVB, offset, 1, rh_1);
 857         }
 858
 859         proto_tree_add_boolean(bf_tree, hf_sna_rh_qri, NullTVB, offset, 1, rh_1);
 860         proto_tree_add_boolean(bf_tree, hf_sna_rh_pi, NullTVB,  offset, 1, rh_1);
 861
 862         offset += 1;
 863
 864         /* Create the bitfield tree for byte 2*/
 865         bf_item = proto_tree_add_uint(tree, hf_sna_rh_2, NullTVB, offset, 1, rh_2);
 866
 867         if (!is_response) {
 868                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_2);
 869
 870                 proto_tree_add_boolean(bf_tree, hf_sna_rh_bbi, NullTVB,  offset, 1, rh_2);
 871                 proto_tree_add_boolean(bf_tree, hf_sna_rh_ebi, NullTVB,  offset, 1, rh_2);
 872                 proto_tree_add_boolean(bf_tree, hf_sna_rh_cdi, NullTVB,  offset, 1, rh_2);
 873                 proto_tree_add_boolean(bf_tree, hf_sna_rh_csi, NullTVB,  offset, 1, rh_2);
 874                 proto_tree_add_boolean(bf_tree, hf_sna_rh_edi, NullTVB,  offset, 1, rh_2);
 875                 proto_tree_add_boolean(bf_tree, hf_sna_rh_pdi, NullTVB,  offset, 1, rh_2);
 876                 proto_tree_add_boolean(bf_tree, hf_sna_rh_cebi, NullTVB, offset, 1, rh_2);
 877         }
 878
 879         /* XXX - check for sdi. If TRUE, the next 4 bytes will be sense data */
 880 }
 881
 882 void
 883 proto_register_sna(void)
 884 {
 885         static hf_register_info hf[] = {
 886                 { &hf_sna_th,
 887                 { "Transmission Header",        "sna.th", FT_NONE, BASE_NONE, NULL, 0x0,
 888                         "" }},
 889
 890                 { &hf_sna_th_0,
 891                 { "Transmission Header Byte 0", "sna.th.0", FT_UINT8, BASE_HEX, NULL, 0x0,
 892                         "Byte 0 of Tranmission Header contains FID, MPF, ODAI,"
 893                         " and EFI as bitfields." }},
 894
 895                 { &hf_sna_th_fid,
 896                 { "Format Identifer",           "sna.th.fid", FT_UINT8, BASE_HEX, VALS(sna_th_fid_vals), 0xf0,
 897                         "Format Identification" }},
 898
 899                 { &hf_sna_th_mpf,
 900                 { "Mapping Field",              "sna.th.mpf", FT_UINT8, BASE_NONE, VALS(sna_th_mpf_vals), 0x0c,
 901                         "The Mapping Field specifies whether the information field"
 902                         " associated with the TH is a complete or partial BIU." }},
 903
 904                 { &hf_sna_th_odai,
 905                 { "ODAI Assignment Indicator",  "sna.th.odai", FT_UINT8, BASE_DEC, NULL, 0x02,
 906                         "The ODAI indicates which node assigned the OAF'-DAF' values"
 907                         " carried in the TH." }},
 908
 909                 { &hf_sna_th_efi,
 910                 { "Expedited Flow Indicator",   "sna.th.efi", FT_UINT8, BASE_DEC, VALS(sna_th_efi_vals), 0x01,
 911                         "The EFI designates whether the PIU belongs to the normal"
 912                         " or expedited flow." }},
 913
 914                 { &hf_sna_th_daf,
 915                 { "Destination Address Field",  "sna.th.daf", FT_UINT16, BASE_HEX, NULL, 0x0,
 916                         "" }},
 917
 918                 { &hf_sna_th_oaf,
 919                 { "Origin Address Field",       "sna.th.oaf", FT_UINT16, BASE_HEX, NULL, 0x0,
 920                         "" }},
 921
 922                 { &hf_sna_th_snf,
 923                 { "Sequence Number Field",      "sna.th.snf", FT_UINT16, BASE_NONE, NULL, 0x0,
 924                         "The Sequence Number Field contains a numerical identifier for"
 925                         " the associated BIU."}},
 926
 927                 { &hf_sna_th_dcf,
 928                 { "Data Count Field",   "sna.th.dcf", FT_UINT16, BASE_DEC, NULL, 0x0,
 929                         "A binary count of the number of bytes in the BIU or BIU segment associated "
 930                         "with the tranmission header. The count does not include any of the bytes "
 931                         "in the transmission header."}},
 932
 933                 { &hf_sna_th_lsid,
 934                 { "Local Session Identification",       "sna.th.lsid", FT_UINT8, BASE_HEX, NULL, 0x0,
 935                         "" }},
 936
 937                 { &hf_sna_th_tg_sweep,
 938                 { "Transmission Group Sweep",           "sna.th.tg_sweep", FT_UINT8, BASE_DEC,
 939                         VALS(sna_th_tg_sweep_vals), 0x08,
 940                         "" }},
 941
 942                 { &hf_sna_th_er_vr_supp_ind,
 943                 { "ER and VR Support Indicator",        "sna.th.er_vr_supp_ind", FT_UINT8, BASE_DEC,
 944                         VALS(sna_th_er_vr_supp_ind_vals), 0x04,
 945                         "" }},
 946
 947                 { &hf_sna_th_vr_pac_cnt_ind,
 948                 { "Virtual Route Pacing Count Indicator",       "sna.th.vr_pac_cnt_ind",
 949                         FT_UINT8, BASE_DEC, VALS(sna_th_vr_pac_cnt_ind_vals), 0x02,
 950                         "" }},
 951
 952                 { &hf_sna_th_ntwk_prty,
 953                 { "Network Priority",   "sna.th.ntwk_prty",
 954                         FT_UINT8, BASE_DEC, VALS(sna_th_ntwk_prty_vals), 0x01,
 955                         "" }},
 956
 957                 { &hf_sna_th_tgsf,
 958                 { "Transmission Group Segmenting Field",        "sna.th.tgsf",
 959                         FT_UINT8, BASE_HEX, VALS(sna_th_tgsf_vals), 0xc0,
 960                         "" }},
 961
 962                 { &hf_sna_th_mft,
 963                 { "MPR FID4 Type",      "sna.th.mft", FT_BOOLEAN, BASE_NONE, NULL, 0x04,
 964                         "" }},
 965
 966                 { &hf_sna_th_piubf,
 967                 { "PIU Blocking Field", "sna.th.piubf", FT_UINT8, BASE_HEX,
 968                         VALS(sna_th_piubf_vals), 0x03,
 969                         "Specifies whether this frame contains a single PIU or multiple PIUs." }},
 970
 971                 { &hf_sna_th_iern,
 972                 { "Initial Explicit Route Number",      "sna.th.iern", FT_UINT8, BASE_DEC, NULL, 0xf0,
 973                         "" }},
 974
 975                 { &hf_sna_th_nlpoi,
 976                 { "NLP Offset Indicator",       "sna.th.nlpoi", FT_UINT8, BASE_DEC,
 977                         VALS(sna_th_nlpoi_vals), 0x80,
 978                         "" }},
 979
 980                 { &hf_sna_th_nlp_cp,
 981                 { "NLP Count or Padding",       "sna.th.nlp_cp", FT_UINT8, BASE_DEC, NULL, 0x70,
 982                         "" }},
 983
 984                 { &hf_sna_th_ern,
 985                 { "Explicit Route Number",      "sna.th.ern", FT_UINT8, BASE_DEC, NULL, 0x0f,
 986                         "The ERN in a TH identifies an explicit route direction of flow." }},
 987
 988                 { &hf_sna_th_vrn,
 989                 { "Virtual Route Number",       "sna.th.vrn", FT_UINT8, BASE_DEC, NULL, 0xf0,
 990                         "" }},
 991
 992                 { &hf_sna_th_tpf,
 993                 { "Transmission Priority Field",        "sna.th.tpf", FT_UINT8, BASE_HEX,
 994                         VALS(sna_th_tpf_vals), 0x03,
 995                         "" }},
 996
 997                 { &hf_sna_th_vr_cwi,
 998                 { "Virtual Route Change Window Indicator",      "sna.th.vr_cwi", FT_UINT16, BASE_DEC,
 999                         VALS(sna_th_vr_cwi_vals), 0x8000,
1000                         "Used to change the window size of the virtual route by 1." }},
1001
1002                 { &hf_sna_th_tg_nonfifo_ind,
1003                 { "Transmission Group Non-FIFO Indicator",      "sna.th.tg_nonfifo_ind", FT_BOOLEAN, 16,
1004                         TFS(&sna_th_tg_nonfifo_ind_truth), 0x4000,
1005                         "Indicates whether or not FIFO discipline is to enforced in "
1006                         "transmitting PIUs through the tranmission groups to prevent the PIUs "
1007                         "getting out of sequence during transmission over the TGs." }},
1008
1009                 { &hf_sna_th_vr_sqti,
1010                 { "Virtual Route Sequence and Type Indicator",  "sna.th.vr_sqti", FT_UINT16, BASE_HEX,
1011                         VALS(sna_th_vr_sqti_vals), 0x3000,
1012                         "Specifies the PIU type." }},
1013
1014                 { &hf_sna_th_tg_snf,
1015                 { "Transmission Group Sequence Number Field",   "sna.th.tg_snf", FT_UINT16, BASE_DEC,
1016                         NULL, 0x0fff,
1017                         "" }},
1018
1019                 { &hf_sna_th_vrprq,
1020                 { "Virtual Route Pacing Request",       "sna.th.vrprq", FT_BOOLEAN, 16,
1021                         TFS(&sna_th_vrprq_truth), 0x8000,
1022                         "" }},
1023
1024                 { &hf_sna_th_vrprs,
1025                 { "Virtual Route Pacing Response",      "sna.th.vrprs", FT_BOOLEAN, 16,
1026                         TFS(&sna_th_vrprs_truth), 0x4000,
1027                         "" }},
1028
1029                 { &hf_sna_th_vr_cwri,
1030                 { "Virtual Route Change Window Reply Indicator",        "sna.th.vr_cwri", FT_UINT16, BASE_DEC,
1031                         VALS(sna_th_vr_cwri_vals), 0x2000,
1032                         "Permits changing of the window size by 1 for PIUs received by the "
1033                         "sender of this bit." }},
1034
1035                 { &hf_sna_th_vr_rwi,
1036                 { "Virtual Route Reset Window Indicator",       "sna.th.vr_rwi", FT_BOOLEAN, 16,
1037                         TFS(&sna_th_vr_rwi_truth), 0x1000,
1038                         "Indicates severe congestion in a node on the virtual route." }},
1039
1040                 { &hf_sna_th_vr_snf_send,
1041                 { "Virtual Route Send Sequence Number Field",   "sna.th.vr_snf_send", FT_UINT16, BASE_DEC,
1042                         NULL, 0x0fff,
1043                         "" }},
1044
1045                 { &hf_sna_th_dsaf,
1046                 { "Destination Subarea Address Field",  "sna.th.dsaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1047                         "" }},
1048
1049                 { &hf_sna_th_osaf,
1050                 { "Origin Subarea Address Field",       "sna.th.osaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1051                         "" }},
1052
1053                 { &hf_sna_th_snai,
1054                 { "SNA Indicator",      "sna.th.snai", FT_BOOLEAN, 8, NULL, 0x10,
1055                         "Used to identify whether the PIU originated or is destined for "
1056                         "an SNA or non-SNA device." }},
1057
1058                 { &hf_sna_th_def,
1059                 { "Destination Element Field",  "sna.th.def", FT_UINT16, BASE_HEX, NULL, 0x0,
1060                         "" }},
1061
1062                 { &hf_sna_th_oef,
1063                 { "Origin Element Field",       "sna.th.oef", FT_UINT16, BASE_HEX, NULL, 0x0,
1064                         "" }},
1065
1066                 { &hf_sna_th_sa,
1067                 { "Session Address",    "sna.th.sa", FT_BYTES, BASE_HEX, NULL, 0x0,
1068                         "" }},
1069
1070                 { &hf_sna_th_cmd_fmt,
1071                 { "Command Format",     "sna.th.cmd_fmt", FT_UINT8, BASE_HEX, NULL, 0x0,
1072                         "" }},
1073
1074                 { &hf_sna_th_cmd_type,
1075                 { "Command Type",       "sna.th.cmd_type", FT_UINT8, BASE_HEX, NULL, 0x0,
1076                         "" }},
1077
1078                 { &hf_sna_th_cmd_sn,
1079                 { "Command Sequence Number",    "sna.th.cmd_sn", FT_UINT16, BASE_DEC, NULL, 0x0,
1080                         "" }},
1081
1082
1083                 { &hf_sna_rh,
1084                 { "Request/Response Header",    "sna.rh", FT_NONE, BASE_NONE, NULL, 0x0,
1085                         "" }},
1086
1087                 { &hf_sna_rh_0,
1088                 { "Request/Response Header Byte 0",     "sna.rh.0", FT_UINT8, BASE_HEX, NULL, 0x0,
1089                         "" }},
1090
1091                 { &hf_sna_rh_1,
1092                 { "Request/Response Header Byte 1",     "sna.rh.1", FT_UINT8, BASE_HEX, NULL, 0x0,
1093                         "" }},
1094
1095                 { &hf_sna_rh_2,
1096                 { "Request/Response Header Byte 2",     "sna.rh.2", FT_UINT8, BASE_HEX, NULL, 0x0,
1097                         "" }},
1098
1099                 { &hf_sna_rh_rri,
1100                 { "Request/Response Indicator", "sna.rh.rri", FT_UINT8, BASE_DEC, VALS(sna_rh_rri_vals), 0x80,
1101                         "Denotes whether this is a request or a response." }},
1102
1103                 { &hf_sna_rh_ru_category,
1104                 { "Request/Response Unit Category",     "sna.rh.ru_category", FT_UINT8, BASE_HEX,
1105                         VALS(sna_rh_ru_category_vals), 0x60,
1106                         "" }},
1107
1108                 { &hf_sna_rh_fi,
1109                 { "Format Indicator",           "sna.rh.fi", FT_BOOLEAN, 8, TFS(&sna_rh_fi_truth), 0x08,
1110                         "" }},
1111
1112                 { &hf_sna_rh_sdi,
1113                 { "Sense Data Included",        "sna.rh.sdi", FT_BOOLEAN, 8, TFS(&sna_rh_sdi_truth), 0x04,
1114                         "Indicates that a 4-byte sense data field is included in the associated RU." }},
1115
1116                 { &hf_sna_rh_bci,
1117                 { "Begin Chain Indicator",      "sna.rh.bci", FT_BOOLEAN, 8, TFS(&sna_rh_bci_truth), 0x02,
1118                         "" }},
1119
1120                 { &hf_sna_rh_eci,
1121                 { "End Chain Indicator",        "sna.rh.eci", FT_BOOLEAN, 8, TFS(&sna_rh_eci_truth), 0x01,
1122                         "" }},
1123
1124                 { &hf_sna_rh_dr1,
1125                 { "Definite Response 1 Indicator",      "sna.rh.dr1", FT_BOOLEAN, 8, NULL, 0x80,
1126                         "" }},
1127
1128                 { &hf_sna_rh_lcci,
1129                 { "Length-Checked Compression Indicator",       "sna.rh.lcci", FT_BOOLEAN, 8,
1130                         TFS(&sna_rh_lcci_truth), 0x40,
1131                         "" }},
1132
1133                 { &hf_sna_rh_dr2,
1134                 { "Definite Response 2 Indicator",      "sna.rh.dr2", FT_BOOLEAN, 8, NULL, 0x20,
1135                         "" }},
1136
1137                 { &hf_sna_rh_eri,
1138                 { "Exception Response Indicator",       "sna.rh.eri", FT_BOOLEAN, 8, NULL, 0x10,
1139                         "Used in conjunction with DR1I and DR2I to indicate, in a request, "
1140                         "the form of response requested." }},
1141
1142                 { &hf_sna_rh_rti,
1143                 { "Response Type Indicator",    "sna.rh.rti", FT_BOOLEAN, 8, TFS(&sna_rh_rti_truth), 0x10,
1144                         "" }},
1145
1146                 { &hf_sna_rh_rlwi,
1147                 { "Request Larger Window Indicator",    "sna.rh.rlwi", FT_BOOLEAN, 8, NULL, 0x04,
1148                         "Indicates whether a larger pacing window was requested." }},
1149
1150                 { &hf_sna_rh_qri,
1151                 { "Queued Response Indicator",  "sna.rh.qri", FT_BOOLEAN, 8, TFS(&sna_rh_qri_truth), 0x02,
1152                         "" }},
1153
1154                 { &hf_sna_rh_pi,
1155                 { "Pacing Indicator",   "sna.rh.pi", FT_BOOLEAN, 8, NULL, 0x01,
1156                         "" }},
1157
1158                 { &hf_sna_rh_bbi,
1159                 { "Begin Bracket Indicator",    "sna.rh.bbi", FT_BOOLEAN, 8, NULL, 0x80,
1160                         "" }},
1161
1162                 { &hf_sna_rh_ebi,
1163                 { "End Bracket Indicator",      "sna.rh.ebi", FT_BOOLEAN, 8, NULL, 0x40,
1164                         "" }},
1165
1166                 { &hf_sna_rh_cdi,
1167                 { "Change Direction Indicator", "sna.rh.cdi", FT_BOOLEAN, 8, NULL, 0x20,
1168                         "" }},
1169
1170                 { &hf_sna_rh_csi,
1171                 { "Code Selection Indicator",   "sna.rh.csi", FT_BOOLEAN, 8, VALS(sna_rh_csi_vals), 0x08,
1172                         "Specifies the encoding used for the associated FMD RU." }},
1173
1174                 { &hf_sna_rh_edi,
1175                 { "Enciphered Data Indicator",  "sna.rh.edi", FT_BOOLEAN, 8, NULL, 0x04,
1176                         "Indicates that information in the associated RU is enciphered under "
1177                         "session-level cryptography protocols." }},
1178
1179                 { &hf_sna_rh_pdi,
1180                 { "Padded Data Indicator",      "sna.rh.pdi", FT_BOOLEAN, 8, NULL, 0x02,
1181                         "Indicates that the RU was padded at the end, before encipherment, to the next "
1182                         "integral multiple of 8 bytes." }},
1183
1184                 { &hf_sna_rh_cebi,
1185                 { "Conditional End Bracket Indicator",  "sna.rh.cebi", FT_BOOLEAN, 8, NULL, 0x01,
1186                         "Used to indicate the beginning or end of a group of exchanged "
1187                         "requests and responses called a bracket. Only used on LU-LU sessions." }},
1188
1189                 { &hf_sna_ru,
1190                 { "Request/Response Unit",      "sna.ru", FT_NONE, BASE_NONE, NULL, 0x0,
1191                         ""}},
1192         };
1193         static gint *ett[] = {
1194                 &ett_sna,
1195                 &ett_sna_th,
1196                 &ett_sna_th_fid,
1197                 &ett_sna_rh,
1198                 &ett_sna_rh_0,
1199                 &ett_sna_rh_1,
1200                 &ett_sna_rh_2,
1201         };
1202
1203         proto_sna = proto_register_protocol("Systems Network Architecture", "sna");
1204         proto_register_field_array(proto_sna, hf, array_length(hf));
1205         proto_register_subtree_array(ett, array_length(ett));
1206 }
1207
1208 void
1209 proto_reg_handoff_sna(void)
1210 {
1211         old_dissector_add("llc.dsap", SAP_SNA_PATHCTRL, dissect_sna);
1212 }