packet-sna.c

   1 /* packet-sna.c
   2  * Routines for SNA
   3  * Gilbert Ramirez <gram@alumni.rice.edu>
   4  *
   5  * $Id: packet-sna.c,v 1.40 2002/05/29 08:55:28 guy Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@ethereal.com>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  24  */
  25
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #ifdef HAVE_SYS_TYPES_H
  31 # include <sys/types.h>
  32 #endif
  33
  34 #include <glib.h>
  35 #include <epan/packet.h>
  36 #include "llcsaps.h"
  37 #include "ppptypes.h"
  38 #include <epan/sna-utils.h>
  39
  40 /*
  41  * http://www.wanresources.com/snacell.html
  42  * ftp://ftp.software.ibm.com/networking/pub/standards/aiw/formats/
  43  *
  44  */
  45
  46 static int proto_sna = -1;
  47 static int hf_sna_th = -1;
  48 static int hf_sna_th_0 = -1;
  49 static int hf_sna_th_fid = -1;
  50 static int hf_sna_th_mpf = -1;
  51 static int hf_sna_th_odai = -1;
  52 static int hf_sna_th_efi = -1;
  53 static int hf_sna_th_daf = -1;
  54 static int hf_sna_th_oaf = -1;
  55 static int hf_sna_th_snf = -1;
  56 static int hf_sna_th_dcf = -1;
  57 static int hf_sna_th_lsid = -1;
  58 static int hf_sna_th_tg_sweep = -1;
  59 static int hf_sna_th_er_vr_supp_ind = -1;
  60 static int hf_sna_th_vr_pac_cnt_ind = -1;
  61 static int hf_sna_th_ntwk_prty = -1;
  62 static int hf_sna_th_tgsf = -1;
  63 static int hf_sna_th_mft = -1;
  64 static int hf_sna_th_piubf = -1;
  65 static int hf_sna_th_iern = -1;
  66 static int hf_sna_th_nlpoi = -1;
  67 static int hf_sna_th_nlp_cp = -1;
  68 static int hf_sna_th_ern = -1;
  69 static int hf_sna_th_vrn = -1;
  70 static int hf_sna_th_tpf = -1;
  71 static int hf_sna_th_vr_cwi = -1;
  72 static int hf_sna_th_tg_nonfifo_ind = -1;
  73 static int hf_sna_th_vr_sqti = -1;
  74 static int hf_sna_th_tg_snf = -1;
  75 static int hf_sna_th_vrprq = -1;
  76 static int hf_sna_th_vrprs = -1;
  77 static int hf_sna_th_vr_cwri = -1;
  78 static int hf_sna_th_vr_rwi = -1;
  79 static int hf_sna_th_vr_snf_send = -1;
  80 static int hf_sna_th_dsaf = -1;
  81 static int hf_sna_th_osaf = -1;
  82 static int hf_sna_th_snai = -1;
  83 static int hf_sna_th_def = -1;
  84 static int hf_sna_th_oef = -1;
  85 static int hf_sna_th_sa = -1;
  86 static int hf_sna_th_cmd_fmt = -1;
  87 static int hf_sna_th_cmd_type = -1;
  88 static int hf_sna_th_cmd_sn = -1;
  89
  90 static int hf_sna_nlp_nhdr = -1;
  91 static int hf_sna_nlp_nhdr_0 = -1;
  92 static int hf_sna_nlp_sm = -1;
  93 static int hf_sna_nlp_tpf = -1;
  94 static int hf_sna_nlp_nhdr_1 = -1;
  95 static int hf_sna_nlp_ft = -1;
  96 static int hf_sna_nlp_tspi = -1;
  97 static int hf_sna_nlp_slowdn1 = -1;
  98 static int hf_sna_nlp_slowdn2 = -1;
  99 static int hf_sna_nlp_fra = -1;
 100 static int hf_sna_nlp_anr = -1;
 101 static int hf_sna_nlp_frh = -1;
 102 static int hf_sna_nlp_thdr = -1;
 103 static int hf_sna_nlp_tcid = -1;
 104 static int hf_sna_nlp_thdr_8 = -1;
 105 static int hf_sna_nlp_setupi = -1;
 106 static int hf_sna_nlp_somi = -1;
 107 static int hf_sna_nlp_eomi = -1;
 108 static int hf_sna_nlp_sri = -1;
 109 static int hf_sna_nlp_rasapi = -1;
 110 static int hf_sna_nlp_retryi = -1;
 111 static int hf_sna_nlp_thdr_9 = -1;
 112 static int hf_sna_nlp_lmi = -1;
 113 static int hf_sna_nlp_cqfi = -1;
 114 static int hf_sna_nlp_osi = -1;
 115 static int hf_sna_nlp_offset = -1;
 116 static int hf_sna_nlp_dlf = -1;
 117 static int hf_sna_nlp_bsn = -1;
 118
 119 static int hf_sna_rh = -1;
 120 static int hf_sna_rh_0 = -1;
 121 static int hf_sna_rh_1 = -1;
 122 static int hf_sna_rh_2 = -1;
 123 static int hf_sna_rh_rri = -1;
 124 static int hf_sna_rh_ru_category = -1;
 125 static int hf_sna_rh_fi = -1;
 126 static int hf_sna_rh_sdi = -1;
 127 static int hf_sna_rh_bci = -1;
 128 static int hf_sna_rh_eci = -1;
 129 static int hf_sna_rh_dr1 = -1;
 130 static int hf_sna_rh_lcci = -1;
 131 static int hf_sna_rh_dr2 = -1;
 132 static int hf_sna_rh_eri = -1;
 133 static int hf_sna_rh_rti = -1;
 134 static int hf_sna_rh_rlwi = -1;
 135 static int hf_sna_rh_qri = -1;
 136 static int hf_sna_rh_pi = -1;
 137 static int hf_sna_rh_bbi = -1;
 138 static int hf_sna_rh_ebi = -1;
 139 static int hf_sna_rh_cdi = -1;
 140 static int hf_sna_rh_csi = -1;
 141 static int hf_sna_rh_edi = -1;
 142 static int hf_sna_rh_pdi = -1;
 143 static int hf_sna_rh_cebi = -1;
 144 /*static int hf_sna_ru = -1;*/
 145
 146 static gint ett_sna = -1;
 147 static gint ett_sna_th = -1;
 148 static gint ett_sna_th_fid = -1;
 149 static gint ett_sna_nlp_nhdr = -1;
 150 static gint ett_sna_nlp_nhdr_0 = -1;
 151 static gint ett_sna_nlp_nhdr_1 = -1;
 152 static gint ett_sna_nlp_thdr = -1;
 153 static gint ett_sna_nlp_thdr_8 = -1;
 154 static gint ett_sna_nlp_thdr_9 = -1;
 155 static gint ett_sna_rh = -1;
 156 static gint ett_sna_rh_0 = -1;
 157 static gint ett_sna_rh_1 = -1;
 158 static gint ett_sna_rh_2 = -1;
 159
 160 static dissector_handle_t data_handle;
 161
 162 /* Format Identifier */
 163 static const value_string sna_th_fid_vals[] = {
 164         { 0x0,  "SNA device <--> Non-SNA Device" },
 165         { 0x1,  "Subarea Nodes, without ER or VR" },
 166         { 0x2,  "Subarea Node <--> PU2" },
 167         { 0x3,  "Subarea Node or SNA host <--> Subarea Node" },
 168         { 0x4,  "Subarea Nodes, supporting ER and VR" },
 169         { 0x5,  "HPR RTP endpoint nodes" },
 170         { 0xa,  "HPR NLP Frame Routing" },
 171         { 0xb,  "HPR NLP Frame Routing" },
 172         { 0xc,  "HPR NLP Automatic Network Routing" },
 173         { 0xd,  "HPR NLP Automatic Network Routing" },
 174         { 0xf,  "Adjaced Subarea Nodes, supporting ER and VR" },
 175         { 0x0,  NULL }
 176 };
 177
 178 /* Mapping Field */
 179 static const value_string sna_th_mpf_vals[] = {
 180         { 0, "Middle segment of a BIU" },
 181         { 1, "Last segment of a BIU" },
 182         { 2, "First segment of a BIU" },
 183         { 3 , "Whole BIU" },
 184         { 0,   NULL }
 185 };
 186
 187 /* Expedited Flow Indicator */
 188 static const value_string sna_th_efi_vals[] = {
 189         { 0, "Normal Flow" },
 190         { 1, "Expedited Flow" },
 191         { 0x0,  NULL }
 192 };
 193
 194 /* Request/Response Indicator */
 195 static const value_string sna_rh_rri_vals[] = {
 196         { 0, "Request" },
 197         { 1, "Response" },
 198         { 0x0,  NULL }
 199 };
 200
 201 /* Request/Response Unit Category */
 202 static const value_string sna_rh_ru_category_vals[] = {
 203         { 0, "Function Management Data (FMD)" },
 204         { 1, "Network Control (NC)" },
 205         { 2, "Data Flow Control (DFC)" },
 206         { 3, "Session Control (SC)" },
 207         { 0x0,  NULL }
 208 };
 209
 210 /* Format Indicator */
 211 static const true_false_string sna_rh_fi_truth =
 212         { "FM Header", "No FM Header" };
 213
 214 /* Sense Data Included */
 215 static const true_false_string sna_rh_sdi_truth =
 216         { "Included", "Not Included" };
 217
 218 /* Begin Chain Indicator */
 219 static const true_false_string sna_rh_bci_truth =
 220         { "First in Chain", "Not First in Chain" };
 221
 222 /* End Chain Indicator */
 223 static const true_false_string sna_rh_eci_truth =
 224         { "Last in Chain", "Not Last in Chain" };
 225
 226 /* Lengith-Checked Compression Indicator */
 227 static const true_false_string sna_rh_lcci_truth =
 228         { "Compressed", "Not Compressed" };
 229
 230 /* Response Type Indicator */
 231 static const true_false_string sna_rh_rti_truth =
 232         { "Negative", "Positive" };
 233
 234 /* Exception Response Indicator */
 235 static const true_false_string sna_rh_eri_truth =
 236         { "Exception", "Definite" };
 237
 238 /* Queued Response Indicator */
 239 static const true_false_string sna_rh_qri_truth =
 240         { "Enqueue response in TC queues", "Response bypasses TC queues" };
 241
 242 /* Code Selection Indicator */
 243 static const value_string sna_rh_csi_vals[] = {
 244         { 0, "EBCDIC" },
 245         { 1, "ASCII" },
 246         { 0x0,  NULL }
 247 };
 248
 249 /* TG Sweep */
 250 static const value_string sna_th_tg_sweep_vals[] = {
 251         { 0, "This PIU may overtake any PU ahead of it." },
 252         { 1, "This PIU does not ovetake any PIU ahead of it." },
 253         { 0x0,  NULL }
 254 };
 255
 256 /* ER_VR_SUPP_IND */
 257 static const value_string sna_th_er_vr_supp_ind_vals[] = {
 258         { 0, "Each node supports ER and VR protocols" },
 259         { 1, "Includes at least one node that does not support ER and VR protocols"  },
 260         { 0x0,  NULL }
 261 };
 262
 263 /* VR_PAC_CNT_IND */
 264 static const value_string sna_th_vr_pac_cnt_ind_vals[] = {
 265         { 0, "Pacing count on the VR has not reached 0" },
 266         { 1, "Pacing count on the VR has reached 0" },
 267         { 0x0,  NULL }
 268 };
 269
 270 /* NTWK_PRTY */
 271 static const value_string sna_th_ntwk_prty_vals[] = {
 272         { 0, "PIU flows at a lower priority" },
 273         { 1, "PIU flows at network priority (highest transmission priority)" },
 274         { 0x0,  NULL }
 275 };
 276
 277 /* TGSF */
 278 static const value_string sna_th_tgsf_vals[] = {
 279         { 0, "Not segmented" },
 280         { 1, "Last segment" },
 281         { 2, "First segment" },
 282         { 3, "Middle segment" },
 283         { 0x0,  NULL }
 284 };
 285
 286 /* PIUBF */
 287 static const value_string sna_th_piubf_vals[] = {
 288         { 0, "Single PIU frame" },
 289         { 1, "Last PIU of a multiple PIU frame" },
 290         { 2, "First PIU of a multiple PIU frame" },
 291         { 3, "Middle PIU of a multiple PIU frame" },
 292         { 0x0,  NULL }
 293 };
 294
 295 /* NLPOI */
 296 static const value_string sna_th_nlpoi_vals[] = {
 297         { 0, "NLP starts within this FID4 TH" },
 298         { 1, "NLP byte 0 starts after RH byte 0 following NLP C/P pad" },
 299         { 0x0,  NULL }
 300 };
 301
 302 /* TPF */
 303 static const value_string sna_th_tpf_vals[] = {
 304         { 0, "Low Priority" },
 305         { 1, "Medium Priority" },
 306         { 2, "High Priority" },
 307         { 3, "Network Priority" },
 308         { 0x0,  NULL }
 309 };
 310
 311 /* VR_CWI */
 312 static const value_string sna_th_vr_cwi_vals[] = {
 313         { 0, "Increment window size" },
 314         { 1, "Decrement window size" },
 315         { 0x0,  NULL }
 316 };
 317
 318 /* TG_NONFIFO_IND */
 319 static const true_false_string sna_th_tg_nonfifo_ind_truth =
 320         { "TG FIFO is not required", "TG FIFO is required" };
 321
 322 /* VR_SQTI */
 323 static const value_string sna_th_vr_sqti_vals[] = {
 324         { 0, "Non-sequenced, Non-supervisory" },
 325         { 1, "Non-sequenced, Supervisory" },
 326         { 2, "Singly-sequenced" },
 327         { 0x0,  NULL }
 328 };
 329
 330 /* VRPRQ */
 331 static const true_false_string sna_th_vrprq_truth = {
 332         "VR pacing request is sent asking for a VR pacing response",
 333         "No VR pacing response is requested",
 334 };
 335
 336 /* VRPRS */
 337 static const true_false_string sna_th_vrprs_truth = {
 338         "VR pacing response is sent in response to a VRPRQ bit set",
 339         "No pacing response sent",
 340 };
 341
 342 /* VR_CWRI */
 343 static const value_string sna_th_vr_cwri_vals[] = {
 344         { 0, "Increment window size by 1" },
 345         { 1, "Decrement window size by 1" },
 346         { 0x0,  NULL }
 347 };
 348
 349 /* VR_RWI */
 350 static const true_false_string sna_th_vr_rwi_truth = {
 351         "Reset window size to the minimum specified in NC_ACTVR",
 352         "Do not reset window size",
 353 };
 354
 355 /* Switching Mode */
 356 static const value_string sna_nlp_sm_vals[] = {
 357         { 5, "Function routing" },
 358         { 6, "Automatic network routing" },
 359         { 0x0,  NULL }
 360 };
 361
 362 static const true_false_string sna_nlp_tspi_truth =
 363         { "Time sensitive", "Not time sensitive" };
 364
 365 static const true_false_string sna_nlp_slowdn1_truth =
 366         { "Minor congestion", "No minor congestion" };
 367
 368 static const true_false_string sna_nlp_slowdn2_truth =
 369         { "Major congestion", "No major congestion" };
 370
 371 /* Function Type */
 372 static const value_string sna_nlp_ft_vals[] = {
 373         { 0x10, "LDLC" },
 374         { 0x0,  NULL }
 375 };
 376
 377 static const value_string sna_nlp_frh_vals[] = {
 378         { 0x03, "XID complete request" },
 379         { 0x04, "XID complete response" },
 380         { 0x0,  NULL }
 381 };
 382
 383 static const true_false_string sna_nlp_setupi_truth =
 384         { "Connection setup segment present", "Connection setup segment not present" };
 385
 386 static const true_false_string sna_nlp_somi_truth =
 387         { "Start of message", "Not start of message" };
 388
 389 static const true_false_string sna_nlp_eomi_truth =
 390         { "End of message", "Not end of message" };
 391
 392 static const true_false_string sna_nlp_sri_truth =
 393         { "Status requested", "No status requested" };
 394
 395 static const true_false_string sna_nlp_rasapi_truth =
 396         { "Reply as soon as possible", "No need to reply as soon as possible" };
 397
 398 static const true_false_string sna_nlp_retryi_truth =
 399         { "Undefined", "Sender will retransmit" };
 400
 401 static const true_false_string sna_nlp_lmi_truth =
 402         { "Last message", "Not last message" };
 403
 404 static const true_false_string sna_nlp_cqfi_truth =
 405         { "CQFI included", "CQFI not included" };
 406
 407 static const true_false_string sna_nlp_osi_truth =
 408         { "Optional segments present", "No optional segments present" };
 409
 410
 411 static int  dissect_fid0_1 (tvbuff_t*, packet_info*, proto_tree*);
 412 static int  dissect_fid2 (tvbuff_t*, packet_info*, proto_tree*);
 413 static int  dissect_fid3 (tvbuff_t*, proto_tree*);
 414 static int  dissect_fid4 (tvbuff_t*, packet_info*, proto_tree*);
 415 static int  dissect_fid5 (tvbuff_t*, proto_tree*);
 416 static int  dissect_fidf (tvbuff_t*, proto_tree*);
 417 static void dissect_fid (tvbuff_t*, packet_info*, proto_tree*, proto_tree*);
 418 static void dissect_nlp (tvbuff_t*, packet_info*, proto_tree*, proto_tree*);
 419 static void dissect_rh (tvbuff_t*, int, proto_tree*);
 420
 421 static void
 422 dissect_sna(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 423 {
 424         guint8          fid;
 425         proto_tree      *sna_tree = NULL;
 426         proto_item      *sna_ti = NULL;
 427
 428         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 429                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "SNA");
 430         if (check_col(pinfo->cinfo, COL_INFO))
 431                 col_clear(pinfo->cinfo, COL_INFO);
 432
 433         /* SNA data should be printed in EBCDIC, not ASCII */
 434         pinfo->fd->flags.encoding = CHAR_EBCDIC;
 435
 436         if (tree) {
 437
 438                 /* Don't bother setting length. We'll set it later after we find
 439                  * the lengths of TH/RH/RU */
 440                 sna_ti = proto_tree_add_item(tree, proto_sna, tvb, 0, -1, FALSE);
 441                 sna_tree = proto_item_add_subtree(sna_ti, ett_sna);
 442         }
 443
 444         /* Transmission Header Format Identifier */
 445         fid = hi_nibble(tvb_get_guint8(tvb, 0));
 446         switch(fid) {
 447                 case 0xa:       /* HPR Network Layer Packet */
 448                 case 0xb:
 449                 case 0xc:
 450                 case 0xd:
 451                         dissect_nlp(tvb, pinfo, sna_tree, tree);
 452                         break;
 453                 default:
 454                         dissect_fid(tvb, pinfo, sna_tree, tree);
 455         }
 456 }
 457
 458 static void
 459 dissect_fid(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
 460     proto_tree *parent_tree)
 461 {
 462
 463         proto_tree      *th_tree = NULL, *rh_tree = NULL;
 464         proto_item      *th_ti = NULL, *rh_ti = NULL;
 465         guint8          th_fid;
 466         int             sna_header_len = 0, th_header_len = 0;
 467         int             offset;
 468
 469         /* Transmission Header Format Identifier */
 470         th_fid = hi_nibble(tvb_get_guint8(tvb, 0));
 471
 472         /* Summary information */
 473         if (check_col(pinfo->cinfo, COL_INFO))
 474                 col_add_str(pinfo->cinfo, COL_INFO,
 475                                 val_to_str(th_fid, sna_th_fid_vals, "Unknown FID: %01x"));
 476
 477         if (tree) {
 478
 479                 /* --- TH --- */
 480                 /* Don't bother setting length. We'll set it later after we find
 481                  * the length of TH */
 482                 th_ti = proto_tree_add_item(tree, hf_sna_th, tvb,  0, -1, FALSE);
 483                 th_tree = proto_item_add_subtree(th_ti, ett_sna_th);
 484         }
 485
 486         /* Get size of TH */
 487         switch(th_fid) {
 488                 case 0x0:
 489                 case 0x1:
 490                         th_header_len = dissect_fid0_1(tvb, pinfo, th_tree);
 491                         break;
 492                 case 0x2:
 493                         th_header_len = dissect_fid2(tvb, pinfo, th_tree);
 494                         break;
 495                 case 0x3:
 496                         th_header_len = dissect_fid3(tvb, th_tree);
 497                         break;
 498                 case 0x4:
 499                         th_header_len = dissect_fid4(tvb, pinfo, th_tree);
 500                         break;
 501                 case 0x5:
 502                         th_header_len = dissect_fid5(tvb, th_tree);
 503                         break;
 504                 case 0xf:
 505                         th_header_len = dissect_fidf(tvb, th_tree);
 506                         break;
 507                 default:
 508                         call_dissector(data_handle,
 509                             tvb_new_subset(tvb, 1, -1, -1), pinfo, parent_tree);
 510                         return;
 511         }
 512
 513         sna_header_len += th_header_len;
 514         offset = th_header_len;
 515
 516         if (tree) {
 517                 proto_item_set_len(th_ti, th_header_len);
 518
 519                 /* --- RH --- */
 520                 rh_ti = proto_tree_add_item(tree, hf_sna_rh, tvb, offset, 3, FALSE);
 521                 rh_tree = proto_item_add_subtree(rh_ti, ett_sna_rh);
 522                 dissect_rh(tvb, offset, rh_tree);
 523
 524                 sna_header_len += 3;
 525                 offset += 3;
 526         }
 527         else {
 528                 sna_header_len += 3;
 529                 offset += 3;
 530         }
 531
 532         if (tvb_offset_exists(tvb, offset+1)) {
 533                 call_dissector(data_handle, tvb_new_subset(tvb, offset, -1, -1),
 534                     pinfo, parent_tree);
 535         }
 536 }
 537
 538 #define SNA_FID01_ADDR_LEN      2
 539
 540 /* FID Types 0 and 1 */
 541 static int
 542 dissect_fid0_1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 543 {
 544         proto_tree      *bf_tree;
 545         proto_item      *bf_item;
 546         guint8          th_0;
 547         const guint8    *ptr;
 548
 549         const int bytes_in_header = 10;
 550
 551         if (tree) {
 552                 /* Byte 0 */
 553                 th_0 = tvb_get_guint8(tvb, 0);
 554                 bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, 0, 1, th_0);
 555                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 556
 557                 proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, 0, 1, th_0);
 558                 proto_tree_add_uint(bf_tree, hf_sna_th_mpf, tvb, 0, 1, th_0);
 559                 proto_tree_add_uint(bf_tree, hf_sna_th_efi, tvb, 0, 1, th_0);
 560
 561                 /* Byte 1 */
 562                 proto_tree_add_text(tree, tvb, 1, 1, "Reserved");
 563
 564                 /* Bytes 2-3 */
 565                 proto_tree_add_item(tree, hf_sna_th_daf, tvb, 2, 2, FALSE);
 566         }
 567
 568         /* Set DST addr */
 569         ptr = tvb_get_ptr(tvb, 2, SNA_FID01_ADDR_LEN);
 570         SET_ADDRESS(&pinfo->net_dst, AT_SNA, SNA_FID01_ADDR_LEN, ptr);
 571         SET_ADDRESS(&pinfo->dst, AT_SNA, SNA_FID01_ADDR_LEN, ptr);
 572
 573         if (tree) {
 574                 proto_tree_add_item(tree, hf_sna_th_oaf, tvb, 4, 2, FALSE);
 575         }
 576
 577         /* Set SRC addr */
 578         ptr = tvb_get_ptr(tvb, 4, SNA_FID01_ADDR_LEN);
 579         SET_ADDRESS(&pinfo->net_src, AT_SNA, SNA_FID01_ADDR_LEN, ptr);
 580         SET_ADDRESS(&pinfo->src, AT_SNA, SNA_FID01_ADDR_LEN, ptr);
 581
 582         /* If we're not filling a proto_tree, return now */
 583         if (tree) {
 584                 return bytes_in_header;
 585         }
 586
 587         proto_tree_add_item(tree, hf_sna_th_snf, tvb, 6, 2, FALSE);
 588         proto_tree_add_item(tree, hf_sna_th_dcf, tvb, 8, 2, FALSE);
 589
 590         return bytes_in_header;
 591 }
 592
 593 #define SNA_FID2_ADDR_LEN       1
 594
 595 /* FID Type 2 */
 596 static int
 597 dissect_fid2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 598 {
 599         proto_tree      *bf_tree;
 600         proto_item      *bf_item;
 601         guint8          th_0=0, daf=0, oaf=0;
 602         const guint8    *ptr;
 603
 604         const int bytes_in_header = 6;
 605
 606         if (tree) {
 607                 th_0 = tvb_get_guint8(tvb, 0);
 608                 daf = tvb_get_guint8(tvb, 2);
 609                 oaf = tvb_get_guint8(tvb, 3);
 610
 611                 /* Byte 0 */
 612                 bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, 0, 1, th_0);
 613                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 614
 615                 proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, 0, 1, th_0);
 616                 proto_tree_add_uint(bf_tree, hf_sna_th_mpf, tvb, 0, 1, th_0);
 617                 proto_tree_add_uint(bf_tree, hf_sna_th_odai,tvb, 0, 1, th_0);
 618                 proto_tree_add_uint(bf_tree, hf_sna_th_efi, tvb, 0, 1, th_0);
 619
 620                 /* Byte 1 */
 621                 proto_tree_add_text(tree, tvb, 1, 1, "Reserved");
 622
 623                 /* Byte 2 */
 624                 proto_tree_add_uint_format(tree, hf_sna_th_daf, tvb, 2, 1, daf,
 625                                 "Destination Address Field: 0x%02x", daf);
 626         }
 627
 628         /* Set DST addr */
 629         ptr = tvb_get_ptr(tvb, 2, SNA_FID2_ADDR_LEN);
 630         SET_ADDRESS(&pinfo->net_dst, AT_SNA, SNA_FID2_ADDR_LEN, ptr);
 631         SET_ADDRESS(&pinfo->dst, AT_SNA, SNA_FID2_ADDR_LEN, ptr);
 632
 633         if (tree) {
 634                 /* Byte 3 */
 635                 proto_tree_add_uint_format(tree, hf_sna_th_oaf, tvb, 3, 1, oaf,
 636                                 "Origin Address Field: 0x%02x", oaf);
 637         }
 638
 639         /* Set SRC addr */
 640         ptr = tvb_get_ptr(tvb, 3, SNA_FID2_ADDR_LEN);
 641         SET_ADDRESS(&pinfo->net_src, AT_SNA, SNA_FID2_ADDR_LEN, ptr);
 642         SET_ADDRESS(&pinfo->src, AT_SNA, SNA_FID2_ADDR_LEN, ptr);
 643
 644         if (tree) {
 645                 proto_tree_add_item(tree, hf_sna_th_snf, tvb, 4, 2, FALSE);
 646         }
 647
 648         return bytes_in_header;
 649 }
 650
 651 /* FID Type 3 */
 652 static int
 653 dissect_fid3(tvbuff_t *tvb, proto_tree *tree)
 654 {
 655         proto_tree      *bf_tree;
 656         proto_item      *bf_item;
 657         guint8          th_0;
 658
 659         const int bytes_in_header = 2;
 660
 661         /* If we're not filling a proto_tree, return now */
 662         if (!tree) {
 663                 return bytes_in_header;
 664         }
 665
 666         th_0 = tvb_get_guint8(tvb, 0);
 667
 668         /* Create the bitfield tree */
 669         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, 0, 1, th_0);
 670         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 671
 672         proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, 0, 1, th_0);
 673         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, tvb, 0, 1, th_0);
 674         proto_tree_add_uint(bf_tree, hf_sna_th_efi, tvb, 0, 1, th_0);
 675
 676         proto_tree_add_item(tree, hf_sna_th_lsid, tvb, 1, 1, FALSE);
 677
 678         return bytes_in_header;
 679 }
 680
 681
 682 static int
 683 dissect_fid4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 684 {
 685         proto_tree      *bf_tree;
 686         proto_item      *bf_item;
 687         int             offset = 0;
 688         guint8          th_byte, mft;
 689         guint16         th_word;
 690         guint16         def, oef;
 691         guint32         dsaf, osaf;
 692         static struct sna_fid_type_4_addr src, dst;
 693
 694         const int bytes_in_header = 26;
 695
 696         /* If we're not filling a proto_tree, return now */
 697         if (!tree) {
 698                 return bytes_in_header;
 699         }
 700
 701         if (tree) {
 702                 th_byte = tvb_get_guint8(tvb, offset);
 703
 704                 /* Create the bitfield tree */
 705                 bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, offset, 1, th_byte);
 706                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 707
 708                 /* Byte 0 */
 709                 proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, offset, 1, th_byte);
 710                 proto_tree_add_uint(bf_tree, hf_sna_th_tg_sweep, tvb, offset, 1, th_byte);
 711                 proto_tree_add_uint(bf_tree, hf_sna_th_er_vr_supp_ind, tvb, offset, 1, th_byte);
 712                 proto_tree_add_uint(bf_tree, hf_sna_th_vr_pac_cnt_ind, tvb, offset, 1, th_byte);
 713                 proto_tree_add_uint(bf_tree, hf_sna_th_ntwk_prty, tvb, offset, 1, th_byte);
 714
 715                 offset += 1;
 716                 th_byte = tvb_get_guint8(tvb, offset);
 717
 718                 /* Create the bitfield tree */
 719                 bf_item = proto_tree_add_text(tree, tvb, offset, 1, "Transmision Header Byte 1");
 720                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 721
 722                 /* Byte 1 */
 723                 proto_tree_add_uint(bf_tree, hf_sna_th_tgsf, tvb, offset, 1, th_byte);
 724                 proto_tree_add_boolean(bf_tree, hf_sna_th_mft, tvb, offset, 1, th_byte);
 725                 proto_tree_add_uint(bf_tree, hf_sna_th_piubf, tvb, offset, 1, th_byte);
 726
 727                 mft = th_byte & 0x04;
 728                 offset += 1;
 729                 th_byte = tvb_get_guint8(tvb, offset);
 730
 731                 /* Create the bitfield tree */
 732                 bf_item = proto_tree_add_text(tree, tvb, offset, 1, "Transmision Header Byte 2");
 733                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 734
 735                 /* Byte 2 */
 736                 if (mft) {
 737                         proto_tree_add_uint(bf_tree, hf_sna_th_nlpoi, tvb, offset, 1, th_byte);
 738                         proto_tree_add_uint(bf_tree, hf_sna_th_nlp_cp, tvb, offset, 1, th_byte);
 739                 }
 740                 else {
 741                         proto_tree_add_uint(bf_tree, hf_sna_th_iern, tvb, offset, 1, th_byte);
 742                 }
 743                 proto_tree_add_uint(bf_tree, hf_sna_th_ern, tvb, offset, 1, th_byte);
 744
 745                 offset += 1;
 746                 th_byte = tvb_get_guint8(tvb, offset);
 747
 748                 /* Create the bitfield tree */
 749                 bf_item = proto_tree_add_text(tree, tvb, offset, 1, "Transmision Header Byte 3");
 750                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 751
 752                 /* Byte 3 */
 753                 proto_tree_add_uint(bf_tree, hf_sna_th_vrn, tvb, offset, 1, th_byte);
 754                 proto_tree_add_uint(bf_tree, hf_sna_th_tpf, tvb, offset, 1, th_byte);
 755
 756                 offset += 1;
 757                 th_word = tvb_get_ntohs(tvb, offset);
 758
 759                 /* Create the bitfield tree */
 760                 bf_item = proto_tree_add_text(tree, tvb, offset, 2, "Transmision Header Bytes 4-5");
 761                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 762
 763                 /* Bytes 4-5 */
 764                 proto_tree_add_uint(bf_tree, hf_sna_th_vr_cwi, tvb, offset, 2, th_word);
 765                 proto_tree_add_boolean(bf_tree, hf_sna_th_tg_nonfifo_ind, tvb, offset, 2, th_word);
 766                 proto_tree_add_uint(bf_tree, hf_sna_th_vr_sqti, tvb, offset, 2, th_word);
 767
 768                 /* I'm not sure about byte-order on this one... */
 769                 proto_tree_add_uint(bf_tree, hf_sna_th_tg_snf, tvb, offset, 2, th_word);
 770
 771                 offset += 2;
 772                 th_word = tvb_get_ntohs(tvb, offset);
 773
 774                 /* Create the bitfield tree */
 775                 bf_item = proto_tree_add_text(tree, tvb, offset, 2, "Transmision Header Bytes 6-7");
 776                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 777
 778                 /* Bytes 6-7 */
 779                 proto_tree_add_boolean(bf_tree, hf_sna_th_vrprq, tvb, offset, 2, th_word);
 780                 proto_tree_add_boolean(bf_tree, hf_sna_th_vrprs, tvb, offset, 2, th_word);
 781                 proto_tree_add_uint(bf_tree, hf_sna_th_vr_cwri, tvb, offset, 2, th_word);
 782                 proto_tree_add_boolean(bf_tree, hf_sna_th_vr_rwi, tvb, offset, 2, th_word);
 783
 784                 /* I'm not sure about byte-order on this one... */
 785                 proto_tree_add_uint(bf_tree, hf_sna_th_vr_snf_send, tvb, offset, 2, th_word);
 786
 787                 offset += 2;
 788         }
 789
 790         dsaf = tvb_get_ntohl(tvb, 8);
 791         if (tree) {
 792                 /* Bytes 8-11 */
 793                 proto_tree_add_uint(tree, hf_sna_th_dsaf, tvb, offset, 4, dsaf);
 794
 795                 offset += 4;
 796         }
 797
 798         osaf = tvb_get_ntohl(tvb, 12);
 799         if (tree) {
 800                 /* Bytes 12-15 */
 801                 proto_tree_add_uint(tree, hf_sna_th_osaf, tvb, offset, 4, osaf);
 802
 803                 offset += 4;
 804                 th_byte = tvb_get_guint8(tvb, offset);
 805
 806                 /* Create the bitfield tree */
 807                 bf_item = proto_tree_add_text(tree, tvb, offset, 2, "Transmision Header Byte 16");
 808                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 809
 810                 /* Byte 16 */
 811                 proto_tree_add_boolean(tree, hf_sna_th_snai, tvb, offset, 1, th_byte);
 812
 813                 /* We luck out here because in their infinite wisdom the SNA
 814                  * architects placed the MPF and EFI fields in the same bitfield
 815                  * locations, even though for FID4 they're not in byte 0.
 816                  * Thank you IBM! */
 817                 proto_tree_add_uint(tree, hf_sna_th_mpf, tvb, offset, 1, th_byte);
 818                 proto_tree_add_uint(tree, hf_sna_th_efi, tvb, offset, 1, th_byte);
 819
 820                 offset += 2; /* 1 for byte 16, 1 for byte 17 which is reserved */
 821         }
 822
 823
 824         def = tvb_get_ntohs(tvb, 18);
 825         if (tree) {
 826                 /* Bytes 18-25 */
 827                 proto_tree_add_uint(tree, hf_sna_th_def, tvb, offset, 2, def);
 828         }
 829
 830         /* Addresses in FID 4 are discontiguous, sigh */
 831         dst.saf = dsaf;
 832         dst.ef = def;
 833         SET_ADDRESS(&pinfo->net_dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN, (guint8* )&dst);
 834         SET_ADDRESS(&pinfo->dst, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN, (guint8 *)&dst);
 835
 836
 837         oef = tvb_get_ntohs(tvb, 20);
 838         if (tree) {
 839                 proto_tree_add_uint(tree, hf_sna_th_oef, tvb, offset+2, 2, oef);
 840         }
 841
 842         /* Addresses in FID 4 are discontiguous, sigh */
 843         src.saf = osaf;
 844         src.ef = oef;
 845         SET_ADDRESS(&pinfo->net_src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN, (guint8 *)&src);
 846         SET_ADDRESS(&pinfo->src, AT_SNA, SNA_FID_TYPE_4_ADDR_LEN, (guint8 *)&src);
 847
 848         if (tree) {
 849                 proto_tree_add_item(tree, hf_sna_th_snf, tvb, offset+4, 2, FALSE);
 850                 proto_tree_add_item(tree, hf_sna_th_dcf, tvb, offset+6, 2, FALSE);
 851         }
 852
 853         return bytes_in_header;
 854 }
 855
 856 /* FID Type 5 */
 857 static int
 858 dissect_fid5(tvbuff_t *tvb, proto_tree *tree)
 859 {
 860         proto_tree      *bf_tree;
 861         proto_item      *bf_item;
 862         guint8          th_0;
 863
 864         const int bytes_in_header = 12;
 865
 866         /* If we're not filling a proto_tree, return now */
 867         if (!tree) {
 868                 return bytes_in_header;
 869         }
 870
 871         th_0 = tvb_get_guint8(tvb, 0);
 872
 873         /* Create the bitfield tree */
 874         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, 0, 1, th_0);
 875         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 876
 877         proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, 0, 1, th_0);
 878         proto_tree_add_uint(bf_tree, hf_sna_th_mpf, tvb, 0, 1, th_0);
 879         proto_tree_add_uint(bf_tree, hf_sna_th_efi, tvb, 0, 1, th_0);
 880
 881         proto_tree_add_text(tree, tvb, 1, 1, "Reserved");
 882         proto_tree_add_item(tree, hf_sna_th_snf, tvb, 2, 2, FALSE);
 883
 884         proto_tree_add_item(tree, hf_sna_th_sa, tvb, 4, 8, FALSE);
 885
 886         return bytes_in_header;
 887
 888 }
 889
 890 /* FID Type f */
 891 static int
 892 dissect_fidf(tvbuff_t *tvb, proto_tree *tree)
 893 {
 894         proto_tree      *bf_tree;
 895         proto_item      *bf_item;
 896         guint8          th_0;
 897
 898         const int bytes_in_header = 26;
 899
 900         /* If we're not filling a proto_tree, return now */
 901         if (!tree) {
 902                 return bytes_in_header;
 903         }
 904
 905         th_0 = tvb_get_guint8(tvb, 0);
 906
 907         /* Create the bitfield tree */
 908         bf_item = proto_tree_add_uint(tree, hf_sna_th_0, tvb, 0, 1, th_0);
 909         bf_tree = proto_item_add_subtree(bf_item, ett_sna_th_fid);
 910
 911         proto_tree_add_uint(bf_tree, hf_sna_th_fid, tvb, 0, 1, th_0);
 912         proto_tree_add_text(tree, tvb, 1, 1, "Reserved");
 913
 914         proto_tree_add_item(tree, hf_sna_th_cmd_fmt, tvb,  2, 1, FALSE);
 915         proto_tree_add_item(tree, hf_sna_th_cmd_type, tvb, 3, 1, FALSE);
 916         proto_tree_add_item(tree, hf_sna_th_cmd_sn, tvb,   4, 2, FALSE);
 917
 918         /* Yup, bytes 6-23 are reserved! */
 919         proto_tree_add_text(tree, tvb, 6, 18, "Reserved");
 920
 921         proto_tree_add_item(tree, hf_sna_th_dcf, tvb, 24, 2, FALSE);
 922
 923         return bytes_in_header;
 924 }
 925
 926 /* HPR Network Layer Packet */
 927 static void
 928 dissect_nlp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
 929     proto_tree *parent_tree)
 930 {
 931         proto_tree      *nlp_tree, *bf_tree;
 932         proto_item      *nlp_item, *bf_item, *h_item;
 933         guint8          nhdr_0, nhdr_1, nhdr_x, thdr_8, thdr_9;
 934         guint32         thdr_len, thdr_dlf, thdr_bsn;
 935
 936         int index = 0, counter = 0;
 937
 938         nlp_tree = NULL;
 939         nlp_item = NULL;
 940
 941         nhdr_0 = tvb_get_guint8(tvb, index);
 942         nhdr_1 = tvb_get_guint8(tvb, index+1);
 943
 944         if (check_col(pinfo->cinfo, COL_INFO))
 945                 col_add_str(pinfo->cinfo, COL_INFO, "HPR NLP Packet");
 946
 947         if (tree) {
 948                 /* Don't bother setting length. We'll set it later after we find
 949                  * the lengths of NHDR */
 950                 nlp_item = proto_tree_add_item(tree, hf_sna_nlp_nhdr, tvb, index, -1, FALSE);
 951                 nlp_tree = proto_item_add_subtree(nlp_item, ett_sna_nlp_nhdr);
 952
 953                 bf_item = proto_tree_add_uint(nlp_tree, hf_sna_nlp_nhdr_0, tvb, index, 1, nhdr_0);
 954                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_nlp_nhdr_0);
 955
 956                 proto_tree_add_uint(bf_tree, hf_sna_nlp_sm, tvb, index, 1, nhdr_0);
 957                 proto_tree_add_uint(bf_tree, hf_sna_nlp_tpf, tvb, index, 1, nhdr_0);
 958
 959                 bf_item = proto_tree_add_uint(nlp_tree, hf_sna_nlp_nhdr_1, tvb, index+1, 1, nhdr_1);
 960                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_nlp_nhdr_1);
 961
 962                 proto_tree_add_uint(bf_tree, hf_sna_nlp_ft, tvb, index+1, 1, nhdr_1);
 963                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_tspi, tvb, index+1, 1, nhdr_1);
 964                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_slowdn1, tvb, index+1, 1, nhdr_1);
 965                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_slowdn2, tvb, index+1, 1, nhdr_1);
 966         }
 967         /* ANR or FR lists */
 968
 969         index += 2;
 970         counter = 0;
 971
 972         if ((nhdr_0 & 0xe0) == 0xa0) {
 973                 do {
 974                         nhdr_x = tvb_get_guint8(tvb, index + counter);
 975                         counter ++;
 976                 } while (nhdr_x != 0xff);
 977                 if (tree)
 978                         h_item = proto_tree_add_item(nlp_tree, hf_sna_nlp_fra, tvb, index, counter, FALSE);
 979                 index += counter;
 980
 981                 index++; /* 1 Byte Reserved */
 982
 983                 if (tree) {
 984                         proto_item_set_len(nlp_item, index);
 985                 }
 986                 if ((nhdr_1 & 0x80) == 0x10) {
 987                         nhdr_x = tvb_get_guint8(tvb, index);
 988                         if (tree) {
 989                                 proto_tree_add_uint(tree, hf_sna_nlp_frh, tvb, index, 1, nhdr_x);
 990                         }
 991                         index ++;
 992
 993                         if (tvb_offset_exists(tvb, index+1)) {
 994                                 call_dissector(data_handle,
 995                                         tvb_new_subset(tvb, index, -1, -1),
 996                                         pinfo, parent_tree);
 997                         }
 998                         return;
 999                 }
1000         }
1001         if ((nhdr_0 & 0xe0) == 0xc0) {
1002                 do {
1003                         nhdr_x = tvb_get_guint8(tvb, index + counter);
1004                         counter ++;
1005                 } while (nhdr_x != 0xff);
1006                 if (tree)
1007                         h_item = proto_tree_add_item(nlp_tree, hf_sna_nlp_anr, tvb, index, counter, FALSE);
1008                 index += counter;
1009
1010                 index++; /* 1 Byte Reserved */
1011
1012                 if (tree) {
1013                         proto_item_set_len(nlp_item, index);
1014                 }
1015
1016         }
1017
1018         thdr_8 = tvb_get_guint8(tvb, index+8);
1019         thdr_9 = tvb_get_guint8(tvb, index+9);
1020         thdr_len = tvb_get_ntohs(tvb, index+10);
1021         thdr_dlf = tvb_get_ntohl(tvb, index+12);
1022         thdr_bsn = tvb_get_ntohl(tvb, index+16);
1023
1024         if (tree) {
1025                 /* Don't bother setting length. We'll set it later after we find
1026                  * the lengths of NHDR */
1027                 nlp_item = proto_tree_add_item(tree, hf_sna_nlp_thdr, tvb, index, -1, FALSE);
1028                 nlp_tree = proto_item_add_subtree(nlp_item, ett_sna_nlp_thdr);
1029
1030                 bf_item = proto_tree_add_item(nlp_tree, hf_sna_nlp_tcid, tvb, index, 8, FALSE);
1031
1032                 bf_item = proto_tree_add_uint(nlp_tree, hf_sna_nlp_thdr_8, tvb, index+8, 1, thdr_8);
1033                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_nlp_thdr_8);
1034
1035                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_setupi, tvb, index+8, 1, thdr_8);
1036                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_somi, tvb, index+8, 1, thdr_8);
1037                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_eomi, tvb, index+8, 1, thdr_8);
1038                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_sri, tvb, index+8, 1, thdr_8);
1039                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_rasapi, tvb, index+8, 1, thdr_8);
1040                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_retryi, tvb, index+8, 1, thdr_8);
1041
1042                 bf_item = proto_tree_add_uint(nlp_tree, hf_sna_nlp_thdr_9, tvb, index+9, 1, thdr_9);
1043                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_nlp_thdr_9);
1044
1045                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_lmi, tvb, index+9, 1, thdr_9);
1046                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_cqfi, tvb, index+9, 1, thdr_9);
1047                 proto_tree_add_boolean(bf_tree, hf_sna_nlp_osi, tvb, index+9, 1, thdr_9);
1048
1049                 proto_tree_add_uint(nlp_tree, hf_sna_nlp_offset, tvb, index+10, 2, thdr_len);
1050                 proto_tree_add_uint(nlp_tree, hf_sna_nlp_dlf, tvb, index+12, 4, thdr_dlf);
1051                 proto_tree_add_uint(nlp_tree, hf_sna_nlp_bsn, tvb, index+16, 4, thdr_bsn);
1052
1053                 proto_item_set_len(nlp_item, thdr_len);
1054         }
1055         index += (thdr_len << 2);
1056         if (((thdr_8 & 0x20) == 0) && thdr_dlf) {
1057                 if (check_col(pinfo->cinfo, COL_INFO))
1058                         col_add_str(pinfo->cinfo, COL_INFO, "HPR Fragment");
1059                 if (tvb_offset_exists(tvb, index+1)) {
1060                         call_dissector(data_handle,
1061                                 tvb_new_subset(tvb, index, -1, -1), pinfo,
1062                                 parent_tree);
1063                 }
1064                 return;
1065         }
1066         if (tvb_offset_exists(tvb, index+1)) {
1067                 dissect_fid(tvb_new_subset(tvb, index, -1, -1), pinfo, tree,
1068                         parent_tree);
1069         }
1070 }
1071
1072 /* RH */
1073 static void
1074 dissect_rh(tvbuff_t *tvb, int offset, proto_tree *tree)
1075 {
1076         proto_tree      *bf_tree;
1077         proto_item      *bf_item;
1078         gboolean        is_response;
1079         guint8          rh_0, rh_1, rh_2;
1080
1081
1082         /* Create the bitfield tree for byte 0*/
1083         rh_0 = tvb_get_guint8(tvb, offset);
1084         is_response = (rh_0 & 0x80);
1085
1086         bf_item = proto_tree_add_uint(tree, hf_sna_rh_0, tvb, offset, 1, rh_0);
1087         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_0);
1088
1089         proto_tree_add_uint(bf_tree, hf_sna_rh_rri, tvb, offset, 1, rh_0);
1090         proto_tree_add_uint(bf_tree, hf_sna_rh_ru_category, tvb, offset, 1, rh_0);
1091         proto_tree_add_boolean(bf_tree, hf_sna_rh_fi, tvb, offset, 1, rh_0);
1092         proto_tree_add_boolean(bf_tree, hf_sna_rh_sdi, tvb, offset, 1, rh_0);
1093         proto_tree_add_boolean(bf_tree, hf_sna_rh_bci, tvb, offset, 1, rh_0);
1094         proto_tree_add_boolean(bf_tree, hf_sna_rh_eci, tvb, offset, 1, rh_0);
1095
1096         offset += 1;
1097         rh_1 = tvb_get_guint8(tvb, offset);
1098
1099         /* Create the bitfield tree for byte 1*/
1100         bf_item = proto_tree_add_uint(tree, hf_sna_rh_1, tvb, offset, 1, rh_1);
1101         bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_1);
1102
1103         proto_tree_add_boolean(bf_tree, hf_sna_rh_dr1, tvb,  offset, 1, rh_1);
1104
1105         if (!is_response) {
1106                 proto_tree_add_boolean(bf_tree, hf_sna_rh_lcci, tvb, offset, 1, rh_1);
1107         }
1108
1109         proto_tree_add_boolean(bf_tree, hf_sna_rh_dr2, tvb,  offset, 1, rh_1);
1110
1111         if (is_response) {
1112                 proto_tree_add_boolean(bf_tree, hf_sna_rh_rti, tvb,  offset, 1, rh_1);
1113         }
1114         else {
1115                 proto_tree_add_boolean(bf_tree, hf_sna_rh_eri, tvb,  offset, 1, rh_1);
1116                 proto_tree_add_boolean(bf_tree, hf_sna_rh_rlwi, tvb, offset, 1, rh_1);
1117         }
1118
1119         proto_tree_add_boolean(bf_tree, hf_sna_rh_qri, tvb, offset, 1, rh_1);
1120         proto_tree_add_boolean(bf_tree, hf_sna_rh_pi, tvb,  offset, 1, rh_1);
1121
1122         offset += 1;
1123         rh_2 = tvb_get_guint8(tvb, offset);
1124
1125         /* Create the bitfield tree for byte 2*/
1126         bf_item = proto_tree_add_uint(tree, hf_sna_rh_2, tvb, offset, 1, rh_2);
1127
1128         if (!is_response) {
1129                 bf_tree = proto_item_add_subtree(bf_item, ett_sna_rh_2);
1130
1131                 proto_tree_add_boolean(bf_tree, hf_sna_rh_bbi, tvb,  offset, 1, rh_2);
1132                 proto_tree_add_boolean(bf_tree, hf_sna_rh_ebi, tvb,  offset, 1, rh_2);
1133                 proto_tree_add_boolean(bf_tree, hf_sna_rh_cdi, tvb,  offset, 1, rh_2);
1134                 proto_tree_add_uint(bf_tree, hf_sna_rh_csi, tvb,  offset, 1, rh_2);
1135                 proto_tree_add_boolean(bf_tree, hf_sna_rh_edi, tvb,  offset, 1, rh_2);
1136                 proto_tree_add_boolean(bf_tree, hf_sna_rh_pdi, tvb,  offset, 1, rh_2);
1137                 proto_tree_add_boolean(bf_tree, hf_sna_rh_cebi, tvb, offset, 1, rh_2);
1138         }
1139
1140         /* XXX - check for sdi. If TRUE, the next 4 bytes will be sense data */
1141 }
1142
1143 void
1144 proto_register_sna(void)
1145 {
1146         static hf_register_info hf[] = {
1147                 { &hf_sna_th,
1148                 { "Transmission Header",        "sna.th", FT_NONE, BASE_NONE, NULL, 0x0,
1149                         "", HFILL }},
1150
1151                 { &hf_sna_th_0,
1152                 { "Transmission Header Byte 0", "sna.th.0", FT_UINT8, BASE_HEX, NULL, 0x0,
1153                         "Byte 0 of Tranmission Header contains FID, MPF, ODAI,"
1154                         " and EFI as bitfields.", HFILL }},
1155
1156                 { &hf_sna_th_fid,
1157                 { "Format Identifer",           "sna.th.fid", FT_UINT8, BASE_HEX, VALS(sna_th_fid_vals), 0xf0,
1158                         "Format Identification", HFILL }},
1159
1160                 { &hf_sna_th_mpf,
1161                 { "Mapping Field",              "sna.th.mpf", FT_UINT8, BASE_DEC, VALS(sna_th_mpf_vals), 0x0c,
1162                         "The Mapping Field specifies whether the information field"
1163                         " associated with the TH is a complete or partial BIU.", HFILL }},
1164
1165                 { &hf_sna_th_odai,
1166                 { "ODAI Assignment Indicator",  "sna.th.odai", FT_UINT8, BASE_DEC, NULL, 0x02,
1167                         "The ODAI indicates which node assigned the OAF'-DAF' values"
1168                         " carried in the TH.", HFILL }},
1169
1170                 { &hf_sna_th_efi,
1171                 { "Expedited Flow Indicator",   "sna.th.efi", FT_UINT8, BASE_DEC, VALS(sna_th_efi_vals), 0x01,
1172                         "The EFI designates whether the PIU belongs to the normal"
1173                         " or expedited flow.", HFILL }},
1174
1175                 { &hf_sna_th_daf,
1176                 { "Destination Address Field",  "sna.th.daf", FT_UINT16, BASE_HEX, NULL, 0x0,
1177                         "", HFILL }},
1178
1179                 { &hf_sna_th_oaf,
1180                 { "Origin Address Field",       "sna.th.oaf", FT_UINT16, BASE_HEX, NULL, 0x0,
1181                         "", HFILL }},
1182
1183                 { &hf_sna_th_snf,
1184                 { "Sequence Number Field",      "sna.th.snf", FT_UINT16, BASE_DEC, NULL, 0x0,
1185                         "The Sequence Number Field contains a numerical identifier for"
1186                         " the associated BIU.", HFILL }},
1187
1188                 { &hf_sna_th_dcf,
1189                 { "Data Count Field",   "sna.th.dcf", FT_UINT16, BASE_DEC, NULL, 0x0,
1190                         "A binary count of the number of bytes in the BIU or BIU segment associated "
1191                         "with the tranmission header. The count does not include any of the bytes "
1192                         "in the transmission header.", HFILL }},
1193
1194                 { &hf_sna_th_lsid,
1195                 { "Local Session Identification",       "sna.th.lsid", FT_UINT8, BASE_HEX, NULL, 0x0,
1196                         "", HFILL }},
1197
1198                 { &hf_sna_th_tg_sweep,
1199                 { "Transmission Group Sweep",           "sna.th.tg_sweep", FT_UINT8, BASE_DEC,
1200                         VALS(sna_th_tg_sweep_vals), 0x08,
1201                         "", HFILL }},
1202
1203                 { &hf_sna_th_er_vr_supp_ind,
1204                 { "ER and VR Support Indicator",        "sna.th.er_vr_supp_ind", FT_UINT8, BASE_DEC,
1205                         VALS(sna_th_er_vr_supp_ind_vals), 0x04,
1206                         "", HFILL }},
1207
1208                 { &hf_sna_th_vr_pac_cnt_ind,
1209                 { "Virtual Route Pacing Count Indicator",       "sna.th.vr_pac_cnt_ind",
1210                         FT_UINT8, BASE_DEC, VALS(sna_th_vr_pac_cnt_ind_vals), 0x02,
1211                         "", HFILL }},
1212
1213                 { &hf_sna_th_ntwk_prty,
1214                 { "Network Priority",   "sna.th.ntwk_prty",
1215                         FT_UINT8, BASE_DEC, VALS(sna_th_ntwk_prty_vals), 0x01,
1216                         "", HFILL }},
1217
1218                 { &hf_sna_th_tgsf,
1219                 { "Transmission Group Segmenting Field",        "sna.th.tgsf",
1220                         FT_UINT8, BASE_HEX, VALS(sna_th_tgsf_vals), 0xc0,
1221                         "", HFILL }},
1222
1223                 { &hf_sna_th_mft,
1224                 { "MPR FID4 Type",      "sna.th.mft", FT_BOOLEAN, BASE_NONE, NULL, 0x04,
1225                         "", HFILL }},
1226
1227                 { &hf_sna_th_piubf,
1228                 { "PIU Blocking Field", "sna.th.piubf", FT_UINT8, BASE_HEX,
1229                         VALS(sna_th_piubf_vals), 0x03,
1230                         "Specifies whether this frame contains a single PIU or multiple PIUs.", HFILL }},
1231
1232                 { &hf_sna_th_iern,
1233                 { "Initial Explicit Route Number",      "sna.th.iern", FT_UINT8, BASE_DEC, NULL, 0xf0,
1234                         "", HFILL }},
1235
1236                 { &hf_sna_th_nlpoi,
1237                 { "NLP Offset Indicator",       "sna.th.nlpoi", FT_UINT8, BASE_DEC,
1238                         VALS(sna_th_nlpoi_vals), 0x80,
1239                         "", HFILL }},
1240
1241                 { &hf_sna_th_nlp_cp,
1242                 { "NLP Count or Padding",       "sna.th.nlp_cp", FT_UINT8, BASE_DEC, NULL, 0x70,
1243                         "", HFILL }},
1244
1245                 { &hf_sna_th_ern,
1246                 { "Explicit Route Number",      "sna.th.ern", FT_UINT8, BASE_DEC, NULL, 0x0f,
1247                         "The ERN in a TH identifies an explicit route direction of flow.", HFILL }},
1248
1249                 { &hf_sna_th_vrn,
1250                 { "Virtual Route Number",       "sna.th.vrn", FT_UINT8, BASE_DEC, NULL, 0xf0,
1251                         "", HFILL }},
1252
1253                 { &hf_sna_th_tpf,
1254                 { "Transmission Priority Field",        "sna.th.tpf", FT_UINT8, BASE_HEX,
1255                         VALS(sna_th_tpf_vals), 0x03,
1256                         "", HFILL }},
1257
1258                 { &hf_sna_th_vr_cwi,
1259                 { "Virtual Route Change Window Indicator",      "sna.th.vr_cwi", FT_UINT16, BASE_DEC,
1260                         VALS(sna_th_vr_cwi_vals), 0x8000,
1261                         "Used to change the window size of the virtual route by 1.", HFILL }},
1262
1263                 { &hf_sna_th_tg_nonfifo_ind,
1264                 { "Transmission Group Non-FIFO Indicator",      "sna.th.tg_nonfifo_ind", FT_BOOLEAN, 16,
1265                         TFS(&sna_th_tg_nonfifo_ind_truth), 0x4000,
1266                         "Indicates whether or not FIFO discipline is to enforced in "
1267                         "transmitting PIUs through the tranmission groups to prevent the PIUs "
1268                         "getting out of sequence during transmission over the TGs.", HFILL }},
1269
1270                 { &hf_sna_th_vr_sqti,
1271                 { "Virtual Route Sequence and Type Indicator",  "sna.th.vr_sqti", FT_UINT16, BASE_HEX,
1272                         VALS(sna_th_vr_sqti_vals), 0x3000,
1273                         "Specifies the PIU type.", HFILL }},
1274
1275                 { &hf_sna_th_tg_snf,
1276                 { "Transmission Group Sequence Number Field",   "sna.th.tg_snf", FT_UINT16, BASE_DEC,
1277                         NULL, 0x0fff,
1278                         "", HFILL }},
1279
1280                 { &hf_sna_th_vrprq,
1281                 { "Virtual Route Pacing Request",       "sna.th.vrprq", FT_BOOLEAN, 16,
1282                         TFS(&sna_th_vrprq_truth), 0x8000,
1283                         "", HFILL }},
1284
1285                 { &hf_sna_th_vrprs,
1286                 { "Virtual Route Pacing Response",      "sna.th.vrprs", FT_BOOLEAN, 16,
1287                         TFS(&sna_th_vrprs_truth), 0x4000,
1288                         "", HFILL }},
1289
1290                 { &hf_sna_th_vr_cwri,
1291                 { "Virtual Route Change Window Reply Indicator",        "sna.th.vr_cwri", FT_UINT16, BASE_DEC,
1292                         VALS(sna_th_vr_cwri_vals), 0x2000,
1293                         "Permits changing of the window size by 1 for PIUs received by the "
1294                         "sender of this bit.", HFILL }},
1295
1296                 { &hf_sna_th_vr_rwi,
1297                 { "Virtual Route Reset Window Indicator",       "sna.th.vr_rwi", FT_BOOLEAN, 16,
1298                         TFS(&sna_th_vr_rwi_truth), 0x1000,
1299                         "Indicates severe congestion in a node on the virtual route.", HFILL }},
1300
1301                 { &hf_sna_th_vr_snf_send,
1302                 { "Virtual Route Send Sequence Number Field",   "sna.th.vr_snf_send", FT_UINT16, BASE_DEC,
1303                         NULL, 0x0fff,
1304                         "", HFILL }},
1305
1306                 { &hf_sna_th_dsaf,
1307                 { "Destination Subarea Address Field",  "sna.th.dsaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1308                         "", HFILL }},
1309
1310                 { &hf_sna_th_osaf,
1311                 { "Origin Subarea Address Field",       "sna.th.osaf", FT_UINT32, BASE_HEX, NULL, 0x0,
1312                         "", HFILL }},
1313
1314                 { &hf_sna_th_snai,
1315                 { "SNA Indicator",      "sna.th.snai", FT_BOOLEAN, 8, NULL, 0x10,
1316                         "Used to identify whether the PIU originated or is destined for "
1317                         "an SNA or non-SNA device.", HFILL }},
1318
1319                 { &hf_sna_th_def,
1320                 { "Destination Element Field",  "sna.th.def", FT_UINT16, BASE_HEX, NULL, 0x0,
1321                         "", HFILL }},
1322
1323                 { &hf_sna_th_oef,
1324                 { "Origin Element Field",       "sna.th.oef", FT_UINT16, BASE_HEX, NULL, 0x0,
1325                         "", HFILL }},
1326
1327                 { &hf_sna_th_sa,
1328                 { "Session Address",    "sna.th.sa", FT_BYTES, BASE_HEX, NULL, 0x0,
1329                         "", HFILL }},
1330
1331                 { &hf_sna_th_cmd_fmt,
1332                 { "Command Format",     "sna.th.cmd_fmt", FT_UINT8, BASE_HEX, NULL, 0x0,
1333                         "", HFILL }},
1334
1335                 { &hf_sna_th_cmd_type,
1336                 { "Command Type",       "sna.th.cmd_type", FT_UINT8, BASE_HEX, NULL, 0x0,
1337                         "", HFILL }},
1338
1339                 { &hf_sna_th_cmd_sn,
1340                 { "Command Sequence Number",    "sna.th.cmd_sn", FT_UINT16, BASE_DEC, NULL, 0x0,
1341                         "", HFILL }},
1342
1343                 { &hf_sna_nlp_nhdr,
1344                 { "Network Layer Packet Header",        "sna.nlp.nhdr", FT_NONE, BASE_NONE, NULL, 0x0,
1345                         "Network Layer Packet Header (NHDR)", HFILL }},
1346
1347                 { &hf_sna_nlp_nhdr_0,
1348                 { "Network Layer Packet Header Byte 0", "sna.nlp.nhdr.0", FT_UINT8, BASE_HEX, NULL, 0x0,
1349                         "Byte 0 of Network Layer Packet contains SM and TPF", HFILL }},
1350
1351                 { &hf_sna_nlp_nhdr_1,
1352                 { "Network Layer Packet Header Bype 1", "sna.nlp.nhdr.1", FT_UINT8, BASE_HEX, NULL, 0x0,
1353                         "Byte 1 of Network Layer Packet contains FT,"
1354                         " Time Sensitive Packet Indicator and Congestion Indicator", HFILL }},
1355
1356                 { &hf_sna_nlp_sm,
1357                 { "Switching Mode Field",       "sna.nlp.nhdr.sm", FT_UINT8, BASE_HEX,
1358                         VALS(sna_nlp_sm_vals), 0xe0,
1359                         "", HFILL }},
1360
1361                 { &hf_sna_nlp_tpf,
1362                 { "Transmission Priority Field",        "sna.nlp.nhdr.tpf", FT_UINT8, BASE_HEX,
1363                         VALS(sna_th_tpf_vals), 0x06,
1364                         "", HFILL }},
1365
1366                 { &hf_sna_nlp_ft,
1367                 { "Function Type",      "sna.nlp.nhdr.ft", FT_UINT8, BASE_HEX,
1368                         VALS(sna_nlp_ft_vals), 0xF0,
1369                         "", HFILL }},
1370
1371                 { &hf_sna_nlp_tspi,
1372                 { "Time Sensitive Packet Indicator",    "sna.nlp.nhdr.tspi", FT_BOOLEAN, 8,
1373                         TFS(&sna_nlp_tspi_truth), 0x08,
1374                         "", HFILL }},
1375
1376                 { &hf_sna_nlp_slowdn1,
1377                 { "Slowdown 1", "sna.nlp.nhdr.slowdn1", FT_BOOLEAN, 8,
1378                         TFS(&sna_nlp_slowdn1_truth), 0x04,
1379                         "", HFILL }},
1380
1381                 { &hf_sna_nlp_slowdn2,
1382                 { "Slowdown 2", "sna.nlp.nhdr.slowdn2", FT_BOOLEAN, 8,
1383                         TFS(&sna_nlp_slowdn2_truth), 0x02,
1384                         "", HFILL }},
1385
1386                 { &hf_sna_nlp_fra,
1387                 { "Function Routing Address Entry",     "sna.nlp.nhdr.fra", FT_BYTES, BASE_NONE, NULL, 0,
1388                         "", HFILL }},
1389
1390                 { &hf_sna_nlp_anr,
1391                 { "Automatic Network Routing Entry",    "sna.nlp.nhdr.anr", FT_BYTES, BASE_HEX, NULL, 0,
1392                         "", HFILL }},
1393
1394                 { &hf_sna_nlp_frh,
1395                 { "Transmission Priority Field",        "sna.nlp.frh", FT_UINT8, BASE_HEX,
1396                         VALS(sna_nlp_frh_vals), 0, "", HFILL }},
1397
1398                 { &hf_sna_nlp_thdr,
1399                 { "RTP Transport Header",       "sna.nlp.thdr", FT_NONE, BASE_NONE, NULL, 0x0,
1400                         "RTP Transport Header (THDR)", HFILL }},
1401
1402                 { &hf_sna_nlp_tcid,
1403                 { "Transport Connection Identifier",    "sna.nlp.thdr.tcid", FT_BYTES, BASE_HEX, NULL, 0x0,
1404                         "Transport Connection Identifier (TCID)", HFILL }},
1405
1406                 { &hf_sna_nlp_thdr_8,
1407                 { "RTP Transport Packet Header Bype 8", "sna.nlp.thdr.8", FT_UINT8, BASE_HEX, NULL, 0x0,
1408                         "Byte 8 of RTP Transport Packet Header", HFILL }},
1409
1410                 { &hf_sna_nlp_setupi,
1411                 { "Setup Indicator",    "sna.nlp.thdr.setupi", FT_BOOLEAN, 8,
1412                         TFS(&sna_nlp_setupi_truth), 0x40,
1413                         "", HFILL }},
1414
1415                 { &hf_sna_nlp_somi,
1416                 { "Start Of Message Indicator", "sna.nlp.thdr.somi", FT_BOOLEAN, 8,
1417                         TFS(&sna_nlp_somi_truth), 0x20,
1418                         "", HFILL }},
1419
1420                 { &hf_sna_nlp_eomi,
1421                 { "End Of Message Indicator",   "sna.nlp.thdr.eomi", FT_BOOLEAN, 8,
1422                         TFS(&sna_nlp_eomi_truth), 0x10,
1423                         "", HFILL }},
1424
1425                 { &hf_sna_nlp_sri,
1426                 { "Session Request Indicator",  "sna.nlp.thdr.sri", FT_BOOLEAN, 8,
1427                         TFS(&sna_nlp_sri_truth), 0x08,
1428                         "", HFILL }},
1429
1430                 { &hf_sna_nlp_rasapi,
1431                 { "Reply ASAP Indicator",       "sna.nlp.thdr.rasapi", FT_BOOLEAN, 8,
1432                         TFS(&sna_nlp_rasapi_truth), 0x04,
1433                         "", HFILL }},
1434
1435                 { &hf_sna_nlp_retryi,
1436                 { "Retry Indicator",    "sna.nlp.thdr.retryi", FT_BOOLEAN, 8,
1437                         TFS(&sna_nlp_retryi_truth), 0x02,
1438                         "", HFILL }},
1439
1440                 { &hf_sna_nlp_thdr_9,
1441                 { "RTP Transport Packet Header Bype 9", "sna.nlp.thdr.9", FT_UINT8, BASE_HEX, NULL, 0x0,
1442                         "Byte 9 of RTP Transport Packet Header", HFILL }},
1443
1444                 { &hf_sna_nlp_lmi,
1445                 { "Last Message Indicator",     "sna.nlp.thdr.lmi", FT_BOOLEAN, 8,
1446                         TFS(&sna_nlp_lmi_truth), 0x80,
1447                         "", HFILL }},
1448
1449                 { &hf_sna_nlp_cqfi,
1450                 { "Connection Qualifyer Field Indicator",       "sna.nlp.thdr.cqfi", FT_BOOLEAN, 8,
1451                         TFS(&sna_nlp_cqfi_truth), 0x08,
1452                         "", HFILL }},
1453
1454                 { &hf_sna_nlp_osi,
1455                 { "Optional Segments Present Indicator",        "sna.nlp.thdr.osi", FT_BOOLEAN, 8,
1456                         TFS(&sna_nlp_osi_truth), 0x04,
1457                         "", HFILL }},
1458
1459                 { &hf_sna_nlp_offset,
1460                 { "Data Offset/4",      "sna.nlp.thdr.offset", FT_UINT16, BASE_HEX, NULL, 0x0,
1461                         "Data Offset in words", HFILL }},
1462
1463                 { &hf_sna_nlp_dlf,
1464                 { "Data Length Field",  "sna.nlp.thdr.dlf", FT_UINT32, BASE_HEX, NULL, 0x0,
1465                         "Data Length Field", HFILL }},
1466
1467                 { &hf_sna_nlp_bsn,
1468                 { "Byte Sequence Number",       "sna.nlp.thdr.bsn", FT_UINT32, BASE_HEX, NULL, 0x0,
1469                         "Byte Sequence Number", HFILL }},
1470
1471
1472                 { &hf_sna_rh,
1473                 { "Request/Response Header",    "sna.rh", FT_NONE, BASE_NONE, NULL, 0x0,
1474                         "", HFILL }},
1475
1476                 { &hf_sna_rh_0,
1477                 { "Request/Response Header Byte 0",     "sna.rh.0", FT_UINT8, BASE_HEX, NULL, 0x0,
1478                         "", HFILL }},
1479
1480                 { &hf_sna_rh_1,
1481                 { "Request/Response Header Byte 1",     "sna.rh.1", FT_UINT8, BASE_HEX, NULL, 0x0,
1482                         "", HFILL }},
1483
1484                 { &hf_sna_rh_2,
1485                 { "Request/Response Header Byte 2",     "sna.rh.2", FT_UINT8, BASE_HEX, NULL, 0x0,
1486                         "", HFILL }},
1487
1488                 { &hf_sna_rh_rri,
1489                 { "Request/Response Indicator", "sna.rh.rri", FT_UINT8, BASE_DEC, VALS(sna_rh_rri_vals), 0x80,
1490                         "Denotes whether this is a request or a response.", HFILL }},
1491
1492                 { &hf_sna_rh_ru_category,
1493                 { "Request/Response Unit Category",     "sna.rh.ru_category", FT_UINT8, BASE_HEX,
1494                         VALS(sna_rh_ru_category_vals), 0x60,
1495                         "", HFILL }},
1496
1497                 { &hf_sna_rh_fi,
1498                 { "Format Indicator",           "sna.rh.fi", FT_BOOLEAN, 8, TFS(&sna_rh_fi_truth), 0x08,
1499                         "", HFILL }},
1500
1501                 { &hf_sna_rh_sdi,
1502                 { "Sense Data Included",        "sna.rh.sdi", FT_BOOLEAN, 8, TFS(&sna_rh_sdi_truth), 0x04,
1503                         "Indicates that a 4-byte sense data field is included in the associated RU.", HFILL }},
1504
1505                 { &hf_sna_rh_bci,
1506                 { "Begin Chain Indicator",      "sna.rh.bci", FT_BOOLEAN, 8, TFS(&sna_rh_bci_truth), 0x02,
1507                         "", HFILL }},
1508
1509                 { &hf_sna_rh_eci,
1510                 { "End Chain Indicator",        "sna.rh.eci", FT_BOOLEAN, 8, TFS(&sna_rh_eci_truth), 0x01,
1511                         "", HFILL }},
1512
1513                 { &hf_sna_rh_dr1,
1514                 { "Definite Response 1 Indicator",      "sna.rh.dr1", FT_BOOLEAN, 8, NULL, 0x80,
1515                         "", HFILL }},
1516
1517                 { &hf_sna_rh_lcci,
1518                 { "Length-Checked Compression Indicator",       "sna.rh.lcci", FT_BOOLEAN, 8,
1519                         TFS(&sna_rh_lcci_truth), 0x40,
1520                         "", HFILL }},
1521
1522                 { &hf_sna_rh_dr2,
1523                 { "Definite Response 2 Indicator",      "sna.rh.dr2", FT_BOOLEAN, 8, NULL, 0x20,
1524                         "", HFILL }},
1525
1526                 { &hf_sna_rh_eri,
1527                 { "Exception Response Indicator",       "sna.rh.eri", FT_BOOLEAN, 8, NULL, 0x10,
1528                         "Used in conjunction with DR1I and DR2I to indicate, in a request, "
1529                         "the form of response requested.", HFILL }},
1530
1531                 { &hf_sna_rh_rti,
1532                 { "Response Type Indicator",    "sna.rh.rti", FT_BOOLEAN, 8, TFS(&sna_rh_rti_truth), 0x10,
1533                         "", HFILL }},
1534
1535                 { &hf_sna_rh_rlwi,
1536                 { "Request Larger Window Indicator",    "sna.rh.rlwi", FT_BOOLEAN, 8, NULL, 0x04,
1537                         "Indicates whether a larger pacing window was requested.", HFILL }},
1538
1539                 { &hf_sna_rh_qri,
1540                 { "Queued Response Indicator",  "sna.rh.qri", FT_BOOLEAN, 8, TFS(&sna_rh_qri_truth), 0x02,
1541                         "", HFILL }},
1542
1543                 { &hf_sna_rh_pi,
1544                 { "Pacing Indicator",   "sna.rh.pi", FT_BOOLEAN, 8, NULL, 0x01,
1545                         "", HFILL }},
1546
1547                 { &hf_sna_rh_bbi,
1548                 { "Begin Bracket Indicator",    "sna.rh.bbi", FT_BOOLEAN, 8, NULL, 0x80,
1549                         "", HFILL }},
1550
1551                 { &hf_sna_rh_ebi,
1552                 { "End Bracket Indicator",      "sna.rh.ebi", FT_BOOLEAN, 8, NULL, 0x40,
1553                         "", HFILL }},
1554
1555                 { &hf_sna_rh_cdi,
1556                 { "Change Direction Indicator", "sna.rh.cdi", FT_BOOLEAN, 8, NULL, 0x20,
1557                         "", HFILL }},
1558
1559                 { &hf_sna_rh_csi,
1560                 { "Code Selection Indicator",   "sna.rh.csi", FT_UINT8, BASE_DEC, VALS(sna_rh_csi_vals), 0x08,
1561                         "Specifies the encoding used for the associated FMD RU.", HFILL }},
1562
1563                 { &hf_sna_rh_edi,
1564                 { "Enciphered Data Indicator",  "sna.rh.edi", FT_BOOLEAN, 8, NULL, 0x04,
1565                         "Indicates that information in the associated RU is enciphered under "
1566                         "session-level cryptography protocols.", HFILL }},
1567
1568                 { &hf_sna_rh_pdi,
1569                 { "Padded Data Indicator",      "sna.rh.pdi", FT_BOOLEAN, 8, NULL, 0x02,
1570                         "Indicates that the RU was padded at the end, before encipherment, to the next "
1571                         "integral multiple of 8 bytes.", HFILL }},
1572
1573                 { &hf_sna_rh_cebi,
1574                 { "Conditional End Bracket Indicator",  "sna.rh.cebi", FT_BOOLEAN, 8, NULL, 0x01,
1575                         "Used to indicate the beginning or end of a group of exchanged "
1576                         "requests and responses called a bracket. Only used on LU-LU sessions.", HFILL }},
1577
1578 /*                { &hf_sna_ru,
1579                 { "Request/Response Unit",      "sna.ru", FT_NONE, BASE_NONE, NULL, 0x0,
1580                         "", HFILL }},*/
1581         };
1582         static gint *ett[] = {
1583                 &ett_sna,
1584                 &ett_sna_th,
1585                 &ett_sna_th_fid,
1586                 &ett_sna_nlp_nhdr,
1587                 &ett_sna_nlp_nhdr_0,
1588                 &ett_sna_nlp_nhdr_1,
1589                 &ett_sna_nlp_thdr,
1590                 &ett_sna_nlp_thdr_8,
1591                 &ett_sna_nlp_thdr_9,
1592                 &ett_sna_rh,
1593                 &ett_sna_rh_0,
1594                 &ett_sna_rh_1,
1595                 &ett_sna_rh_2,
1596         };
1597
1598         proto_sna = proto_register_protocol("Systems Network Architecture",
1599             "SNA", "sna");
1600         proto_register_field_array(proto_sna, hf, array_length(hf));
1601         proto_register_subtree_array(ett, array_length(ett));
1602         register_dissector("sna", dissect_sna, proto_sna);
1603 }
1604
1605 void
1606 proto_reg_handoff_sna(void)
1607 {
1608         dissector_handle_t sna_handle;
1609
1610         sna_handle = find_dissector("sna");
1611         dissector_add("llc.dsap", SAP_SNA_PATHCTRL, sna_handle);
1612         /* RFC 2043 */
1613         dissector_add("ppp.protocol", PPP_SNA, sna_handle);
1614         data_handle = find_dissector("data");
1615 }