packet-fc.c

   1 /* packet-fc.c
   2  * Routines for Fibre Channel Decoding (FC Header, Link Ctl & Basic Link Svc)
   3  * Copyright 2001, Dinesh G Dutt <ddutt@cisco.com>
   4  *   Copyright 2003  Ronnie Sahlberg, exchange first/last matching and
   5  *                                    tap listener and misc updates
   6  *
   7  * $Id: packet-fc.c,v 1.18 2004/02/19 00:29:15 gerald Exp $
   8  *
   9  * Ethereal - Network traffic analyzer
  10  * By Gerald Combs <gerald@ethereal.com>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30
  31 #endif
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #ifdef HAVE_SYS_TYPES_H
  38 # include <sys/types.h>
  39 #endif
  40
  41 #ifdef HAVE_NETINET_IN_H
  42 # include <netinet/in.h>
  43 #endif
  44
  45 #include <glib.h>
  46
  47 #ifdef NEED_SNPRINTF_H
  48 # include "snprintf.h"
  49 #endif
  50
  51 #include <epan/packet.h>
  52 #include "prefs.h"
  53 #include "reassemble.h"
  54 #include <epan/conversation.h>
  55 #include "etypes.h"
  56 #include "packet-fc.h"
  57 #include "packet-fclctl.h"
  58 #include "packet-fcbls.h"
  59 #include "tap.h"
  60
  61 #define FC_HEADER_SIZE         24
  62 #define FC_RCTL_EISL           0x50
  63 #define MDSHDR_TRAILER_SIZE    6
  64
  65 /* Size of various fields in FC header in bytes */
  66 #define FC_RCTL_SIZE           1
  67 #define FC_DID_SIZE            3
  68 #define FC_CSCTL_SIZE          1
  69 #define FC_SID_SIZE            3
  70 #define FC_TYPE_SIZE           1
  71 #define FC_FCTL_SIZE           3
  72 #define FC_SEQID_SIZE          1
  73 #define FC_DFCTL_SIZE          1
  74 #define FC_SEQCNT_SIZE         2
  75 #define FC_OXID_SIZE           2
  76 #define FC_RXID_SIZE           2
  77 #define FC_PARAM_SIZE          4
  78
  79 /* Initialize the protocol and registered fields */
  80 static int proto_fc = -1;
  81 static int hf_fc_time = -1;
  82 static int hf_fc_exchange_first_frame = -1;
  83 static int hf_fc_exchange_last_frame = -1;
  84 static int hf_fc_rctl = -1;
  85 static int hf_fc_did = -1;
  86 static int hf_fc_csctl = -1;
  87 static int hf_fc_sid = -1;
  88 static int hf_fc_id = -1;
  89 static int hf_fc_type = -1;
  90 static int hf_fc_fctl = -1;
  91 static int hf_fc_fctl_exchange_responder = -1;
  92 static int hf_fc_fctl_seq_recipient = -1;
  93 static int hf_fc_fctl_exchange_first = -1;
  94 static int hf_fc_fctl_exchange_last = -1;
  95 static int hf_fc_fctl_seq_last = -1;
  96 static int hf_fc_fctl_priority = -1;
  97 static int hf_fc_fctl_transfer_seq_initiative = -1;
  98 static int hf_fc_fctl_rexmitted_seq = -1;
  99 static int hf_fc_fctl_rel_offset = -1;
 100 static int hf_fc_fctl_abts_ack = -1;
 101 static int hf_fc_fctl_abts_not_ack = -1;
 102 static int hf_fc_fctl_last_data_frame = -1;
 103 static int hf_fc_fctl_ack_0_1 = -1;
 104 static int hf_fc_seqid = -1;
 105 static int hf_fc_dfctl = -1;
 106 static int hf_fc_seqcnt = -1;
 107 static int hf_fc_oxid = -1;
 108 static int hf_fc_rxid = -1;
 109 static int hf_fc_param = -1;
 110 static int hf_fc_ftype = -1;    /* Derived field, non-existent in FC hdr */
 111 static int hf_fc_reassembled = -1;
 112 static int hf_fc_eisl = -1;
 113
 114 /* Network_Header fields */
 115 static int hf_fc_nh_da = -1;
 116 static int hf_fc_nh_sa = -1;
 117
 118 /* For Basic Link Svc */
 119 static int hf_fc_bls_seqid_vld = -1;
 120 static int hf_fc_bls_lastvld_seqid = -1;
 121 static int hf_fc_bls_oxid = -1;
 122 static int hf_fc_bls_rxid = -1;
 123 static int hf_fc_bls_lowseqcnt = -1;
 124 static int hf_fc_bls_hiseqcnt = -1;
 125 static int hf_fc_bls_rjtcode = -1;
 126 static int hf_fc_bls_rjtdetail = -1;
 127 static int hf_fc_bls_vendor = -1;
 128
 129
 130 /* Initialize the subtree pointers */
 131 static gint ett_fc = -1;
 132 static gint ett_fctl = -1;
 133 static gint ett_fcbls = -1;
 134
 135 static dissector_table_t fcftype_dissector_table;
 136 static dissector_handle_t data_handle;
 137
 138 static int fc_tap = -1;
 139
 140 /* Reassembly stuff */
 141 static gboolean fc_reassemble = TRUE;
 142 static guint32  fc_max_frame_size = 1024;
 143 static GHashTable *fc_fragment_table = NULL;
 144
 145 typedef struct _fcseq_conv_key {
 146     guint32 conv_idx;
 147 } fcseq_conv_key_t;
 148
 149 typedef struct _fcseq_conv_data {
 150     guint32 seq_cnt;
 151 } fcseq_conv_data_t;
 152
 153 GHashTable *fcseq_req_hash = NULL;
 154 GMemChunk *fcseq_req_keys = NULL;
 155 GMemChunk *fcseq_req_vals = NULL;
 156 guint32 fcseq_init_count = 25;
 157
 158 static GHashTable *fc_exchange_unmatched = NULL;
 159 static GHashTable *fc_exchange_matched = NULL;
 160 static GMemChunk *fc_exchange_vals = NULL;
 161 static guint32 fc_exchange_init_count = 200;
 162
 163 /*
 164  * Hash Functions
 165  */
 166 static gint
 167 fcseq_equal(gconstpointer v, gconstpointer w)
 168 {
 169   fcseq_conv_key_t *v1 = (fcseq_conv_key_t *)v;
 170   fcseq_conv_key_t *v2 = (fcseq_conv_key_t *)w;
 171
 172   return (v1->conv_idx == v2->conv_idx);
 173 }
 174
 175 static guint
 176 fcseq_hash (gconstpointer v)
 177 {
 178     fcseq_conv_key_t *key = (fcseq_conv_key_t *)v;
 179     guint val;
 180
 181     val = key->conv_idx;
 182
 183     return val;
 184 }
 185
 186 static guint
 187 fc_exchange_hash_unmatched(gconstpointer v)
 188 {
 189     const fc_exchange_data *fced=(const fc_exchange_data *)v;
 190
 191     return fced->oxid;
 192 }
 193 static gint
 194 fc_exchange_equal_unmatched(gconstpointer v1, gconstpointer v2)
 195 {
 196     const fc_exchange_data *fced1=(const fc_exchange_data *)v1;
 197     const fc_exchange_data *fced2=(const fc_exchange_data *)v2;
 198
 199     /* oxid must match */
 200     if(fced1->oxid!=fced2->oxid){
 201         return 0;
 202     }
 203     /* compare s_id, d_id and treat the fc address
 204        s_id==00.00.00 as a wildcard matching anything */
 205     if( ((fced1->s_id.data[0]!=0)||(fced1->s_id.data[1]!=0)||(fced1->s_id.data[2]!=0)) && CMP_ADDRESS(&fced1->s_id, &fced2->s_id) ){
 206         return 0;
 207     }
 208     if(CMP_ADDRESS(&fced1->d_id, &fced2->d_id)){
 209         return 0;
 210     }
 211
 212     return 1;
 213 }
 214
 215 static guint
 216 fc_exchange_hash_matched(gconstpointer v)
 217 {
 218     const fc_exchange_data *fced=(const fc_exchange_data *)v;
 219
 220     return fced->oxid;
 221 }
 222 static gint
 223 fc_exchange_equal_matched(gconstpointer v1, gconstpointer v2)
 224 {
 225     const fc_exchange_data *fced1=(const fc_exchange_data *)v1;
 226     const fc_exchange_data *fced2=(const fc_exchange_data *)v2;
 227     guint32 fef1, fef2, lef1, lef2;
 228
 229     /* oxid must match */
 230     if(fced1->oxid!=fced2->oxid){
 231         return 0;
 232     }
 233     fef1=fced1->first_exchange_frame;
 234     fef2=fced2->first_exchange_frame;
 235     lef1=fced1->last_exchange_frame;
 236     lef2=fced2->last_exchange_frame;
 237     if(!fef1)fef1=fef2;
 238     if(!fef2)fef2=fef1;
 239     if(!lef1)lef1=lef2;
 240     if(!lef2)lef2=lef1;
 241
 242     if(fef1!=fef2){
 243         return 0;
 244     }
 245     if(lef1!=lef2){
 246         return 0;
 247     }
 248
 249     return 1;
 250 }
 251
 252 static void
 253 fc_exchange_init_protocol(void)
 254 {
 255     if(fc_exchange_vals){
 256         g_mem_chunk_destroy(fc_exchange_vals);
 257         fc_exchange_vals=NULL;
 258     }
 259     if(fc_exchange_unmatched){
 260         g_hash_table_destroy(fc_exchange_unmatched);
 261         fc_exchange_unmatched=NULL;
 262     }
 263     if(fc_exchange_matched){
 264         g_hash_table_destroy(fc_exchange_matched);
 265         fc_exchange_matched=NULL;
 266     }
 267
 268     fc_exchange_unmatched=g_hash_table_new(fc_exchange_hash_unmatched, fc_exchange_equal_unmatched);
 269     fc_exchange_matched=g_hash_table_new(fc_exchange_hash_matched, fc_exchange_equal_matched);
 270     fc_exchange_vals=g_mem_chunk_new("fc_exchange_vals", sizeof(fc_exchange_data), fc_exchange_init_count*sizeof(fc_exchange_data), G_ALLOC_AND_FREE);
 271
 272     fragment_table_init(&fc_fragment_table);
 273
 274     if (fcseq_req_keys)
 275         g_mem_chunk_destroy (fcseq_req_keys);
 276     if (fcseq_req_vals)
 277         g_mem_chunk_destroy (fcseq_req_vals);
 278     if (fcseq_req_hash)
 279         g_hash_table_destroy(fcseq_req_hash);
 280
 281     fcseq_req_hash = g_hash_table_new(fcseq_hash, fcseq_equal);
 282     fcseq_req_keys = g_mem_chunk_new ("fcseq_req_keys",
 283                                       sizeof(fcseq_conv_key_t),
 284                                       fcseq_init_count *
 285                                       sizeof(fcseq_conv_key_t),
 286                                       G_ALLOC_AND_FREE);
 287     fcseq_req_vals = g_mem_chunk_new ("fcseq_req_vals",
 288                                       sizeof(fcseq_conv_data_t),
 289                                       fcseq_init_count *
 290                                       sizeof(fcseq_conv_data_t),
 291                                       G_ALLOC_AND_FREE);
 292 }
 293
 294
 295 const value_string fc_fc4_val[] = {
 296     {FC_TYPE_ELS,        "Ext Link Svc"},
 297     {FC_TYPE_LLCSNAP,    "LLC_SNAP"},
 298     {FC_TYPE_IP,         "IP/FC"},
 299     {FC_TYPE_SCSI,       "FCP"},
 300     {FC_TYPE_FCCT,       "FC_CT"},
 301     {FC_TYPE_SWILS,      "SW_ILS"},
 302     {FC_TYPE_AL,         "AL"},
 303     {FC_TYPE_SNMP,       "SNMP"},
 304     {FC_TYPE_SB_FROM_CU, "SB-3(CU->Channel)"},
 305     {FC_TYPE_SB_TO_CU,   "SB-3(Channel->CU)"},
 306     {0, NULL},
 307 };
 308
 309 static const value_string fc_ftype_vals [] = {
 310     {FC_FTYPE_UNDEF ,    "Unknown frame"},
 311     {FC_FTYPE_SWILS,     "SW_ILS"},
 312     {FC_FTYPE_IP ,       "IP/FC"},
 313     {FC_FTYPE_SCSI ,     "FCP"},
 314     {FC_FTYPE_BLS ,      "Basic Link Svc"},
 315     {FC_FTYPE_ELS ,      "ELS"},
 316     {FC_FTYPE_FCCT ,     "FC_CT"},
 317     {FC_FTYPE_LINKDATA,  "Link Data"},
 318     {FC_FTYPE_VDO,       "Video Data"},
 319     {FC_FTYPE_LINKCTL,   "Link Ctl"},
 320     {FC_FTYPE_SBCCS,     "SBCCS"},
 321     {0, NULL},
 322 };
 323
 324 static const value_string fc_wka_vals[] = {
 325     {FC_WKA_MULTICAST,    "Multicast Server"},
 326     {FC_WKA_CLKSYNC,      "Clock Sync Server"},
 327     {FC_WKA_KEYDIST,      "Key Distribution Server"},
 328     {FC_WKA_ALIAS,        "Alias Server"},
 329     {FC_WKA_QOSF,         "QoS Facilitator"},
 330     {FC_WKA_MGMT,         "Management Server"},
 331     {FC_WKA_TIME,         "Time Server"},
 332     {FC_WKA_DNS,          "Directory Server"},
 333     {FC_WKA_FABRIC_CTRLR, "Fabric Ctlr"},
 334     {FC_WKA_FPORT,        "F_Port Server"},
 335     {FC_WKA_BCAST,        "Broadcast ID"},
 336     {0, NULL},
 337 };
 338
 339 static const value_string fc_routing_val[] = {
 340     {FC_RCTL_DEV_DATA,  "Device_Data"},
 341     {FC_RCTL_ELS,       "Extended Link Services"},
 342     {FC_RCTL_LINK_DATA, "FC-4 Link_Data"},
 343     {FC_RCTL_VIDEO,     "Video_Data"},
 344     {FC_RCTL_BLS,       "Basic Link Services"},
 345     {FC_RCTL_LINK_CTL,  "Link_Control Frame"},
 346     {0, NULL},
 347 };
 348
 349 static const value_string fc_iu_val[] = {
 350     {FC_IU_UNCATEGORIZED   , "Uncategorized Data"},
 351     {FC_IU_SOLICITED_DATA  , "Solicited Data"},
 352     {FC_IU_UNSOLICITED_CTL , "Unsolicited Control"},
 353     {FC_IU_SOLICITED_CTL   , "Solicited Control"},
 354     {FC_IU_UNSOLICITED_DATA, "Solicited Data"},
 355     {FC_IU_DATA_DESCRIPTOR , "Data Descriptor"},
 356     {FC_IU_UNSOLICITED_CMD , "Unsolicited Command"},
 357     {FC_IU_CMD_STATUS      , "Command Status"},
 358     {0, NULL},
 359 };
 360
 361
 362 static void fc_defragment_init(void)
 363 {
 364   fragment_table_init(&fc_fragment_table);
 365 }
 366
 367
 368 static gchar *
 369 fctl_to_str (const guint8 *fctl, gchar *str, gboolean is_ack)
 370 {
 371     int stroff = 0;
 372     guint8 tmp = 0;
 373
 374     if (str == NULL)
 375         return (str);
 376
 377     if (fctl[2] & 0x80) {
 378         strcpy (str, "Exchange Responder, ");
 379         stroff += 20;
 380     }
 381     else {
 382         strcpy (str, "Exchange Originator, ");
 383         stroff += 21;
 384     }
 385
 386     if (fctl[2] & 0x40) {
 387         strcpy (&str[stroff], "Seq Recipient, ");
 388         stroff += 15;
 389     }
 390     else {
 391         strcpy (&str[stroff], "Seq Initiator, ");
 392         stroff += 15;
 393     }
 394
 395     if (fctl[2] & 0x20) {
 396         strcpy (&str[stroff], "Exchg First, ");
 397         stroff += 13;
 398     }
 399
 400     if (fctl[2] & 0x10) {
 401         strcpy (&str[stroff], "Exchg Last, ");
 402         stroff += 12;
 403     }
 404
 405     if (fctl[2] & 0x8) {
 406         strcpy (&str[stroff], "Seq Last, ");
 407         stroff += 10;
 408     }
 409
 410     if (fctl[2] & 0x2) {
 411         strcpy (&str[stroff], "Priority, ");
 412         stroff += 10;
 413     }
 414     else {
 415         strcpy (&str[stroff], "CS_CTL, ");
 416         stroff += 8;
 417     }
 418
 419     if (fctl[2] & 0x1) {
 420         strcpy (&str[stroff], "Transfer Seq Initiative, ");
 421         stroff += 25;
 422     }
 423
 424     if (fctl[1] & 0x30) {
 425         strcpy (&str[stroff], "ACK_0 Reqd, ");
 426         stroff += 12;
 427     }
 428     else if (fctl[1] & 0x10) {
 429         strcpy (&str[stroff], "ACK_1 Reqd, ");
 430         stroff += 12;
 431     }
 432
 433     if (fctl[1] & 0x2) {
 434         strcpy (&str[stroff], "Rexmitted Seq, ");
 435         stroff += 15;
 436     }
 437
 438     tmp = fctl[0] & 0xC0;
 439     switch (tmp) {
 440     case 0:
 441         strcpy (&str[stroff], "Last Data Frame - No Info, ");
 442         stroff += 27;
 443         break;
 444     case 1:
 445         strcpy (&str[stroff], "Last Data Frame - Seq Imm, ");
 446         stroff += 27;
 447         break;
 448     case 2:
 449         strcpy (&str[stroff], "Last Data Frame - Seq Soon, ");
 450         stroff += 28;
 451         break;
 452     case 3:
 453         strcpy (&str[stroff], "Last Data Frame - Seq Delyd, ");
 454         stroff += 29;
 455         break;
 456     }
 457
 458     tmp = fctl[0] & 0x30;
 459     switch (tmp) {
 460     case 0:
 461         if (is_ack) {
 462             strcpy (&str[stroff], "ABTS - Cont, ");
 463             stroff += 13;
 464         }
 465         else {
 466             strcpy (&str[stroff], "ABTS - Abort/MS, ");
 467             stroff += 17;
 468         }
 469         break;
 470     case 0x10:
 471         if (is_ack) {
 472             strcpy (&str[stroff], "ABTS - AbortABTS - Abort, ");
 473             stroff += 14;
 474         }
 475         else {
 476             strcpy (&str[stroff], "ABTS - Abort/SS, ");
 477             stroff += 17;
 478         }
 479         break;
 480     case 0x20:
 481         if (is_ack) {
 482             strcpy (&str[stroff], "ABTS - Stop, ");
 483             stroff += 13;
 484         }
 485         else {
 486             strcpy (&str[stroff], "ABTS - Process/IB, ");
 487             stroff += 19;
 488         }
 489         break;
 490     case 0x30:
 491         if (is_ack) {
 492             strcpy (&str[stroff], "ABTS - Imm Seq Retx, ");
 493             stroff += 21;
 494         }
 495         else {
 496             strcpy (&str[stroff], "ABTS - Discard/MS/Imm Retx, ");
 497             stroff += 28;
 498         }
 499         break;
 500     }
 501
 502     if (fctl[0] & 0x8) {
 503         strcpy (&str[stroff], "Rel Offset = 1");
 504         stroff += 14;
 505     }
 506
 507     return (str);
 508 }
 509
 510 /* BA_ACC & BA_RJT are decoded in this file itself instead of a traditional
 511  * dedicated file and dissector format because the dissector would require some
 512  * fields of the FC_HDR such as param in some cases, type in some others, the
 513  * lower 4 bits of r_ctl in some other cases etc. So, we decode BLS & Link Ctl
 514  * in this file itself.
 515  */
 516 static void
 517 dissect_fc_ba_acc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 518 {
 519     /* Set up structures needed to add the protocol subtree and manage it */
 520     proto_item *ti;
 521     proto_tree *acc_tree;
 522     int offset = 0;
 523
 524     /* Make entries in Protocol column and Info column on summary display */
 525     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 526         col_set_str(pinfo->cinfo, COL_PROTOCOL, "BLS");
 527
 528     if (check_col(pinfo->cinfo, COL_INFO))
 529         col_set_str(pinfo->cinfo, COL_INFO, "BA_ACC");
 530
 531     if (tree) {
 532         ti = proto_tree_add_text (tree, tvb, 0, tvb_length (tvb), "Basic Link Svc");
 533         acc_tree = proto_item_add_subtree (ti, ett_fcbls);
 534
 535         proto_tree_add_item (acc_tree, hf_fc_bls_seqid_vld, tvb, offset++, 1, FALSE);
 536         proto_tree_add_item (acc_tree, hf_fc_bls_lastvld_seqid, tvb, offset++, 1, FALSE);
 537         offset += 2; /* Skip reserved field */
 538         proto_tree_add_item (acc_tree, hf_fc_bls_oxid, tvb, offset, 2, FALSE);
 539         offset += 2;
 540         proto_tree_add_item (acc_tree, hf_fc_bls_rxid, tvb, offset, 2, FALSE);
 541         offset += 2;
 542         proto_tree_add_item (acc_tree, hf_fc_bls_lowseqcnt, tvb, offset, 2, FALSE);
 543         offset += 2;
 544         proto_tree_add_item (acc_tree, hf_fc_bls_hiseqcnt, tvb, offset, 2, FALSE);
 545     }
 546 }
 547
 548 static void
 549 dissect_fc_ba_rjt (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 550 {
 551     /* Set up structures needed to add the protocol subtree and manage it */
 552     proto_item *ti;
 553     proto_tree *rjt_tree;
 554     int offset = 0;
 555
 556     /* Make entries in Protocol column and Info column on summary display */
 557     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 558         col_set_str(pinfo->cinfo, COL_PROTOCOL, "BLS");
 559
 560     if (check_col(pinfo->cinfo, COL_INFO))
 561         col_set_str(pinfo->cinfo, COL_INFO, "BA_RJT");
 562
 563     if (tree) {
 564         ti = proto_tree_add_text (tree, tvb, 0, tvb_length (tvb), "Basic Link Svc");
 565         rjt_tree = proto_item_add_subtree (ti, ett_fcbls);
 566
 567         proto_tree_add_item (rjt_tree, hf_fc_bls_rjtcode, tvb, offset+1, 1, FALSE);
 568         proto_tree_add_item (rjt_tree, hf_fc_bls_rjtdetail, tvb, offset+2, 1, FALSE);
 569         proto_tree_add_item (rjt_tree, hf_fc_bls_vendor, tvb, offset+3, 1, FALSE);
 570     }
 571 }
 572
 573 static guint8
 574 fc_get_ftype (guint8 r_ctl, guint8 type)
 575 {
 576     /* A simple attempt to determine the upper level protocol based on the
 577      * r_ctl & type fields.
 578      */
 579     switch (r_ctl & 0xF0) {
 580     case FC_RCTL_DEV_DATA:
 581         switch (type) {
 582         case FC_TYPE_SWILS:
 583             if ((r_ctl == 0x2) || (r_ctl == 0x3))
 584                 return FC_FTYPE_SWILS;
 585             else
 586                 return FC_FTYPE_UNDEF;
 587         case FC_TYPE_IP:
 588             return FC_FTYPE_IP;
 589         case FC_TYPE_SCSI:
 590             return FC_FTYPE_SCSI;
 591         case FC_TYPE_FCCT:
 592             return FC_FTYPE_FCCT;
 593         case FC_TYPE_SB_FROM_CU:
 594         case FC_TYPE_SB_TO_CU:
 595             return FC_FTYPE_SBCCS;
 596         default:
 597             return FC_FTYPE_UNDEF;
 598         }
 599         break;
 600     case FC_RCTL_ELS:
 601         if (((r_ctl & 0x0F) == 0x2) || ((r_ctl & 0x0F) == 0x3))
 602             return FC_FTYPE_ELS;
 603         else
 604             return FC_FTYPE_UNDEF;
 605         break;
 606     case FC_RCTL_LINK_DATA:
 607         return FC_FTYPE_LINKDATA;
 608         break;
 609     case FC_RCTL_VIDEO:
 610         return FC_FTYPE_VDO;
 611         break;
 612     case FC_RCTL_BLS:
 613         if (type == 0)
 614             return FC_FTYPE_BLS;
 615         else
 616             return FC_FTYPE_UNDEF;
 617         break;
 618     case FC_RCTL_LINK_CTL:
 619         return FC_FTYPE_LINKCTL;
 620         break;
 621     default:
 622         return FC_FTYPE_UNDEF;
 623         break;
 624     }
 625 }
 626
 627 static const value_string abts_ack_vals[] = {
 628         {0x000000,      "ABTS - Cont"},
 629         {0x000010,      "ABTS - Abort"},
 630         {0x000020,      "ABTS - Stop"},
 631         {0x000030,      "ABTS - Imm Seq Retx"},
 632         {0,NULL}
 633 };
 634 static const value_string abts_not_ack_vals[] = {
 635         {0x000000,      "ABTS - Abort/MS"},
 636         {0x000010,      "ABTS - Abort/SS"},
 637         {0x000020,      "ABTS - Process/IB"},
 638         {0x000030,      "ABTS - Discard/MS/Imm Retx"},
 639         {0,NULL}
 640 };
 641 static const value_string last_data_frame_vals[] = {
 642         {0x000000,      "Last Data Frame - No Info"},
 643         {0x004000,      "Last Data Frame - Seq Imm"},
 644         {0x008000,      "Last Data Frame - Seq Soon"},
 645         {0x00c000,      "Last Data Frame - Seq Delyd"},
 646         {0,NULL}
 647 };
 648 static const value_string ack_0_1_vals[] = {
 649         {0x003000,      "ACK_0 Required"},
 650         {0x002000,      "ACK_0 Required"},
 651         {0x001000,      "ACK_1 Required"},
 652         {0x000000,      "no ack required"},
 653         {0,NULL}
 654 };
 655 static const true_false_string tfs_fc_fctl_exchange_responder = {
 656         "Exchange Responder",
 657         "Exchange Originator"
 658 };
 659 static const true_false_string tfs_fc_fctl_seq_recipient = {
 660         "Seq Recipient",
 661         "Seq Initiator"
 662 };
 663 static const true_false_string tfs_fc_fctl_exchange_first = {
 664         "Exchg First",
 665         "NOT exchg first"
 666 };
 667 static const true_false_string tfs_fc_fctl_exchange_last = {
 668         "Exchg Last",
 669         "NOT exchg last"
 670 };
 671 static const true_false_string tfs_fc_fctl_seq_last = {
 672         "Seq Last",
 673         "NOT seq last"
 674 };
 675 static const true_false_string tfs_fc_fctl_priority = {
 676         "Priority",
 677         "CS_CTL"
 678 };
 679 static const true_false_string tfs_fc_fctl_transfer_seq_initiative = {
 680         "Transfer Seq Initiative",
 681         "NOT transfer seq initiative"
 682 };
 683 static const true_false_string tfs_fc_fctl_rexmitted_seq = {
 684         "Retransmitted Sequence",
 685         "NOT retransmitted sequence"
 686 };
 687 static const true_false_string tfs_fc_fctl_rel_offset = {
 688         "Rel Offset SET",
 689         "rel offset NOT set"
 690 };
 691
 692
 693
 694
 695 /* code to dissect the  F_CTL bitmask */
 696 static void
 697 dissect_fc_fctl(packet_info *pinfo _U_, proto_tree *parent_tree, tvbuff_t *tvb, int offset, gboolean is_ack, guint32 fctl)
 698 {
 699         proto_item *item;
 700         proto_tree *tree;
 701         gchar str[256];
 702
 703         item=proto_tree_add_uint(parent_tree, hf_fc_fctl, tvb, offset, 3, fctl);
 704         tree=proto_item_add_subtree(item, ett_fctl);
 705
 706
 707         proto_tree_add_boolean(tree, hf_fc_fctl_exchange_responder, tvb, offset, 3, fctl);
 708
 709         proto_tree_add_boolean(tree, hf_fc_fctl_seq_recipient, tvb, offset, 3, fctl);
 710
 711         proto_tree_add_boolean(tree, hf_fc_fctl_exchange_first, tvb, offset, 3, fctl);
 712
 713         proto_tree_add_boolean(tree, hf_fc_fctl_exchange_last, tvb, offset, 3, fctl);
 714
 715         proto_tree_add_boolean(tree, hf_fc_fctl_seq_last, tvb, offset, 3, fctl);
 716
 717         proto_tree_add_boolean(tree, hf_fc_fctl_priority, tvb, offset, 3, fctl);
 718
 719         proto_tree_add_boolean(tree, hf_fc_fctl_transfer_seq_initiative, tvb, offset, 3, fctl);
 720
 721         proto_tree_add_uint(tree, hf_fc_fctl_last_data_frame, tvb, offset, 3, fctl);
 722
 723         proto_tree_add_uint(tree, hf_fc_fctl_ack_0_1, tvb, offset, 3, fctl);
 724
 725
 726         proto_tree_add_boolean(tree, hf_fc_fctl_rexmitted_seq, tvb, offset, 3, fctl);
 727
 728         if(is_ack){
 729                 proto_tree_add_uint(tree, hf_fc_fctl_abts_ack, tvb, offset, 3, fctl);
 730         } else {
 731                 proto_tree_add_uint(tree, hf_fc_fctl_abts_ack, tvb, offset, 3, fctl);
 732         }
 733
 734         proto_tree_add_boolean(tree, hf_fc_fctl_rel_offset, tvb, offset, 3, fctl);
 735
 736         fctl_to_str( ((guint8 *)&fctl), str, is_ack);
 737         proto_item_append_text(item, "  %s", str);
 738 }
 739
 740 static const value_string fc_bls_proto_val[] = {
 741     {FC_BLS_NOP    , "NOP"},
 742     {FC_BLS_ABTS   , "ABTS"},
 743     {FC_BLS_RMC    , "RMC"},
 744     {FC_BLS_BAACC  , "BA_ACC"},
 745     {FC_BLS_BARJT  , "BA_RJT"},
 746     {FC_BLS_PRMT   , "PRMT"},
 747     {0, NULL},
 748 };
 749
 750 static const value_string fc_els_proto_val[] = {
 751     {0x01    , "Solicited Data"},
 752     {0x02    , "Request"},
 753     {0x03    , "Reply"},
 754     {0, NULL},
 755 };
 756
 757 /* Code to actually dissect the packets */
 758 static void
 759 dissect_fc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 760 {
 761    /* Set up structures needed to add the protocol subtree and manage it */
 762     proto_item *ti=NULL;
 763     proto_tree *fc_tree = NULL;
 764     tvbuff_t *next_tvb;
 765     int offset = 0, next_offset, eisl_offset = -1;
 766     gboolean is_lastframe_inseq, is_1frame_inseq, is_valid_frame;
 767     gboolean is_exchg_resp = 0;
 768     fragment_data *fcfrag_head;
 769     guint32 frag_id;
 770     guint32 frag_size;
 771     guint8 df_ctl, seq_id;
 772
 773     guint32 param;
 774     guint16 real_seqcnt;
 775     guint8 ftype;
 776     gboolean is_ack;
 777
 778     static fc_hdr fchdr;
 779     fc_exchange_data *fc_ex=NULL;
 780
 781     conversation_t *conversation;
 782     fcseq_conv_data_t *cdata;
 783     fcseq_conv_key_t ckey, *req_key;
 784
 785     fchdr.fced=NULL;
 786
 787     /* Make entries in Protocol column and Info column on summary display */
 788     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 789         col_set_str(pinfo->cinfo, COL_PROTOCOL, "FC");
 790
 791     fchdr.r_ctl = tvb_get_guint8 (tvb, offset);
 792
 793     /* If the R_CTL is the EISL field, skip the first 8 bytes to retrieve the
 794      * real FC header. EISL is Cisco-proprietary and is not decoded.
 795      */
 796     if (fchdr.r_ctl == FC_RCTL_EISL) {
 797         eisl_offset = offset;
 798         offset += 8;
 799         fchdr.r_ctl = tvb_get_guint8 (tvb, offset);
 800     }
 801
 802     SET_ADDRESS (&pinfo->dst, AT_FC, 3, tvb_get_ptr(tvb,offset+1,3));
 803     SET_ADDRESS (&fchdr.d_id, AT_FC, 3, tvb_get_ptr(tvb,offset+1,3));
 804     SET_ADDRESS (&pinfo->src, AT_FC, 3, tvb_get_ptr(tvb,offset+5,3));
 805     SET_ADDRESS (&fchdr.s_id, AT_FC, 3, tvb_get_ptr(tvb,offset+5,3));
 806     fchdr.cs_ctl = tvb_get_guint8 (tvb, offset+4);
 807     fchdr.type  = tvb_get_guint8 (tvb, offset+8);
 808     fchdr.fctl=tvb_get_ntoh24(tvb,offset+9);
 809     fchdr.seqcnt = tvb_get_ntohs (tvb, offset+14);
 810     fchdr.oxid=tvb_get_ntohs(tvb,offset+16);
 811     fchdr.rxid=tvb_get_ntohs(tvb,offset+18);
 812     param = tvb_get_ntohl (tvb, offset+20);
 813     seq_id = tvb_get_guint8 (tvb, offset+12);
 814
 815     pinfo->oxid = fchdr.oxid;
 816     pinfo->rxid = fchdr.rxid;
 817     pinfo->ptype = PT_EXCHG;
 818     pinfo->r_ctl = fchdr.r_ctl;
 819
 820     is_ack = ((fchdr.r_ctl == 0xC0) || (fchdr.r_ctl == 0xC1));
 821
 822     /* There are two ways to determine if this is the first frame of a
 823      * sequence. Either:
 824      * (i) The SOF bits indicate that this is the first frame OR
 825      * (ii) This is an SOFf frame and seqcnt is 0.
 826      */
 827     is_1frame_inseq = (((pinfo->sof_eof & PINFO_SOF_FIRST_FRAME) == PINFO_SOF_FIRST_FRAME) ||
 828                        (((pinfo->sof_eof & PINFO_SOF_SOFF) == PINFO_SOF_SOFF) &&
 829                         (fchdr.seqcnt == 0)));
 830
 831     is_lastframe_inseq = ((pinfo->sof_eof & PINFO_EOF_LAST_FRAME) == PINFO_EOF_LAST_FRAME);
 832
 833     if ((pinfo->sof_eof & PINFO_SOF_SOFF) == PINFO_SOF_SOFF) {
 834         is_lastframe_inseq = fchdr.fctl & FC_FCTL_SEQ_LAST;
 835     }
 836     is_valid_frame = ((pinfo->sof_eof & 0x40) == 0x40);
 837
 838     ftype = fc_get_ftype (fchdr.r_ctl, fchdr.type);
 839
 840     if (check_col (pinfo->cinfo, COL_INFO)) {
 841         col_add_str (pinfo->cinfo, COL_INFO, match_strval (ftype, fc_ftype_vals));
 842
 843         if (ftype == FC_FTYPE_LINKCTL)
 844             col_append_fstr (pinfo->cinfo, COL_INFO, ", %s",
 845                              match_strval ((fchdr.r_ctl & 0x0F),
 846                                            fc_lctl_proto_val));
 847     }
 848
 849     /* In the interest of speed, if "tree" is NULL, don't do any work not
 850        necessary to generate protocol tree items. */
 851     if (tree) {
 852         ti = proto_tree_add_protocol_format (tree, proto_fc, tvb, offset,
 853                                              FC_HEADER_SIZE, "Fibre Channel");
 854         fc_tree = proto_item_add_subtree (ti, ett_fc);
 855     }
 856
 857     /* Highlight EISL header, if present */
 858     if (eisl_offset != -1) {
 859         proto_tree_add_item (fc_tree, hf_fc_eisl, tvb, eisl_offset, 8, 0);
 860     }
 861
 862     /* match first exchange with last exchange */
 863     if(fchdr.fctl&FC_FCTL_EXCHANGE_FIRST){
 864         if(!pinfo->fd->flags.visited){
 865             fc_exchange_data fced, *old_fced;
 866
 867             /* first check if we already have seen this exchange and it
 868                is still open/unmatched.
 869             */
 870             fced.oxid=fchdr.oxid;
 871             SET_ADDRESS(&fced.s_id, fchdr.s_id.type, fchdr.s_id.len, fchdr.s_id.data);
 872             SET_ADDRESS(&fced.d_id, fchdr.d_id.type, fchdr.d_id.len, fchdr.d_id.data);
 873             old_fced=g_hash_table_lookup(fc_exchange_unmatched, &fced);
 874             if(old_fced){
 875                 g_hash_table_remove(fc_exchange_unmatched, old_fced);
 876             }
 877             old_fced=g_mem_chunk_alloc(fc_exchange_vals);
 878             old_fced->oxid=fchdr.oxid;
 879             COPY_ADDRESS(&old_fced->s_id, &fchdr.s_id);
 880             COPY_ADDRESS(&old_fced->d_id, &fchdr.d_id);
 881             old_fced->first_exchange_frame=pinfo->fd->num;
 882             old_fced->fc_time.nsecs = pinfo->fd->abs_usecs*1000;
 883             old_fced->fc_time.secs = pinfo->fd->abs_secs;
 884             g_hash_table_insert(fc_exchange_unmatched, old_fced, old_fced);
 885             fc_ex=old_fced;
 886         } else {
 887             fc_exchange_data fced, *old_fced;
 888             fced.oxid=fchdr.oxid;
 889             fced.first_exchange_frame=pinfo->fd->num;
 890             fced.last_exchange_frame=0;
 891             old_fced=g_hash_table_lookup(fc_exchange_matched, &fced);
 892             fc_ex=old_fced;
 893         }
 894     }
 895     if(fchdr.fctl&FC_FCTL_EXCHANGE_LAST){
 896         if(!pinfo->fd->flags.visited){
 897             fc_exchange_data fced, *old_fced;
 898
 899             fced.oxid=fchdr.oxid;
 900             SET_ADDRESS(&fced.s_id, fchdr.d_id.type, fchdr.d_id.len, fchdr.d_id.data);
 901             SET_ADDRESS(&fced.d_id, fchdr.s_id.type, fchdr.s_id.len, fchdr.s_id.data);
 902             old_fced=g_hash_table_lookup(fc_exchange_unmatched, &fced);
 903             if(old_fced){
 904                 g_hash_table_remove(fc_exchange_unmatched, old_fced);
 905                 old_fced->last_exchange_frame=pinfo->fd->num;
 906                 g_hash_table_insert(fc_exchange_matched, old_fced, old_fced);
 907             }
 908             fc_ex=old_fced;
 909         } else {
 910             fc_exchange_data fced, *old_fced;
 911             fced.oxid=fchdr.oxid;
 912             fced.first_exchange_frame=0;
 913             fced.last_exchange_frame=pinfo->fd->num;
 914             old_fced=g_hash_table_lookup(fc_exchange_matched, &fced);
 915             fc_ex=old_fced;
 916         }
 917     }
 918     if(fc_ex){
 919         if(fchdr.fctl&FC_FCTL_EXCHANGE_FIRST){
 920             proto_tree_add_uint(fc_tree, hf_fc_exchange_last_frame, tvb, 0, 0, fc_ex->last_exchange_frame);
 921         }
 922         if(fchdr.fctl&FC_FCTL_EXCHANGE_LAST){
 923             nstime_t delta_time;
 924             proto_tree_add_uint(fc_tree, hf_fc_exchange_first_frame, tvb, 0, 0, fc_ex->first_exchange_frame);
 925             delta_time.secs = pinfo->fd->abs_secs - fc_ex->fc_time.secs;
 926             delta_time.nsecs = pinfo->fd->abs_usecs*1000 - fc_ex->fc_time.nsecs;
 927             if (delta_time.nsecs<0){
 928                 delta_time.nsecs+=1000000000;
 929                 delta_time.secs--;
 930             }
 931             proto_tree_add_time(ti, hf_fc_time, tvb, 0, 0, &delta_time);
 932         }
 933     }
 934     fchdr.fced=fc_ex;
 935
 936     switch (fchdr.r_ctl & 0xF0) {
 937
 938     case FC_RCTL_DEV_DATA:
 939     case FC_RCTL_LINK_DATA:
 940     case FC_RCTL_VIDEO:
 941         /* the lower 4 bits of R_CTL are the information category */
 942         proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 943                                     FC_RCTL_SIZE, fchdr.r_ctl,
 944                                     "R_CTL: 0x%x(%s/%s)",
 945                                     fchdr.r_ctl,
 946                                     val_to_str ((fchdr.r_ctl & 0xF0),
 947                                                 fc_routing_val, "0x%x"),
 948                                     val_to_str ((fchdr.r_ctl & 0x0F),
 949                                                 fc_iu_val, "0x%x"));
 950         break;
 951
 952     case FC_RCTL_LINK_CTL:
 953         /* the lower 4 bits of R_CTL indicate the type of link ctl frame */
 954         proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 955                                     FC_RCTL_SIZE, fchdr.r_ctl,
 956                                     "R_CTL: 0x%x(%s/%s)",
 957                                     fchdr.r_ctl,
 958                                     val_to_str ((fchdr.r_ctl & 0xF0),
 959                                                 fc_routing_val, "0x%x"),
 960                                     val_to_str ((fchdr.r_ctl & 0x0F),
 961                                                 fc_lctl_proto_val, "0x%x"));
 962         break;
 963
 964     case FC_RCTL_BLS:
 965         switch (fchdr.type) {
 966
 967         case 0x00:
 968             /* the lower 4 bits of R_CTL indicate the type of BLS frame */
 969             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 970                                         FC_RCTL_SIZE, fchdr.r_ctl,
 971                                         "R_CTL: 0x%x(%s/%s)",
 972                                         fchdr.r_ctl,
 973                                         val_to_str ((fchdr.r_ctl & 0xF0),
 974                                                     fc_routing_val, "0x%x"),
 975                                         val_to_str ((fchdr.r_ctl & 0x0F),
 976                                                     fc_bls_proto_val, "0x%x"));
 977             break;
 978
 979         default:
 980             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 981                                         FC_RCTL_SIZE, fchdr.r_ctl,
 982                                         "R_CTL: 0x%x(%s/0x%x)",
 983                                         fchdr.r_ctl,
 984                                         val_to_str ((fchdr.r_ctl & 0xF0),
 985                                                     fc_routing_val, "0x%x"),
 986                                         fchdr.r_ctl & 0x0F);
 987             break;
 988         }
 989         break;
 990
 991     case FC_RCTL_ELS:
 992         switch (fchdr.type) {
 993
 994         case 0x01:
 995             /* the lower 4 bits of R_CTL indicate the type of ELS frame */
 996             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 997                                         FC_RCTL_SIZE, fchdr.r_ctl,
 998                                         "R_CTL: 0x%x(%s/%s)",
 999                                         fchdr.r_ctl,
1000                                         val_to_str ((fchdr.r_ctl & 0xF0),
1001                                                     fc_routing_val, "0x%x"),
1002                                         val_to_str ((fchdr.r_ctl & 0x0F),
1003                                                     fc_els_proto_val, "0x%x"));
1004             break;
1005
1006         default:
1007             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
1008                                         FC_RCTL_SIZE, fchdr.r_ctl,
1009                                         "R_CTL: 0x%x(%s/0x%x)",
1010                                         fchdr.r_ctl,
1011                                         val_to_str ((fchdr.r_ctl & 0xF0),
1012                                                     fc_routing_val, "0x%x"),
1013                                         fchdr.r_ctl & 0x0F);
1014             break;
1015         }
1016         break;
1017
1018     default:
1019         proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
1020                                     FC_RCTL_SIZE, fchdr.r_ctl,
1021                                     "R_CTL: 0x%x(%s/0x%x)",
1022                                     fchdr.r_ctl,
1023                                     val_to_str ((fchdr.r_ctl & 0xF0),
1024                                                 fc_routing_val, "0x%x"),
1025                                     fchdr.r_ctl & 0x0F);
1026         break;
1027     }
1028
1029     proto_tree_add_uint_hidden (fc_tree, hf_fc_ftype, tvb, offset, 1,
1030                            ftype);
1031
1032     /* XXX - use "fc_wka_vals[]" on this? */
1033     proto_tree_add_string (fc_tree, hf_fc_did, tvb, offset+1, 3,
1034                            fc_to_str (fchdr.d_id.data));
1035     proto_tree_add_string_hidden (fc_tree, hf_fc_id, tvb, offset+1, 3,
1036                            fc_to_str (fchdr.d_id.data));
1037
1038     proto_tree_add_uint (fc_tree, hf_fc_csctl, tvb, offset+4, 1, fchdr.cs_ctl);
1039
1040     /* XXX - use "fc_wka_vals[]" on this? */
1041     proto_tree_add_string (fc_tree, hf_fc_sid, tvb, offset+5, 3,
1042                            fc_to_str (fchdr.s_id.data));
1043     proto_tree_add_string_hidden (fc_tree, hf_fc_id, tvb, offset+5, 3,
1044                            fc_to_str (fchdr.s_id.data));
1045
1046     if (ftype == FC_FTYPE_LINKCTL) {
1047         if (((fchdr.r_ctl & 0x0F) == FC_LCTL_FBSYB) ||
1048             ((fchdr.r_ctl & 0x0F) == FC_LCTL_FBSYL)) {
1049             /* for F_BSY frames, the upper 4 bits of the type field specify the
1050              * reason for the BSY.
1051              */
1052             proto_tree_add_uint_format (fc_tree, hf_fc_type, tvb,
1053                                         offset+8, FC_TYPE_SIZE,
1054                                         fchdr.type,"Type: 0x%x(%s)", fchdr.type,
1055                                         fclctl_get_typestr ((guint8) (fchdr.r_ctl & 0x0F),
1056                                                             fchdr.type));
1057         } else {
1058             proto_tree_add_item (fc_tree, hf_fc_type, tvb, offset+8, 1, FALSE);
1059         }
1060     } else {
1061         proto_tree_add_item (fc_tree, hf_fc_type, tvb, offset+8, 1, FALSE);
1062     }
1063
1064
1065     dissect_fc_fctl(pinfo, fc_tree, tvb, offset+9, is_ack, fchdr.fctl);
1066
1067
1068     proto_tree_add_item (fc_tree, hf_fc_seqid, tvb, offset+12, 1, FALSE);
1069
1070     df_ctl = tvb_get_guint8(tvb, offset+13);
1071
1072     proto_tree_add_uint (fc_tree, hf_fc_dfctl, tvb, offset+13, 1, df_ctl);
1073     proto_tree_add_uint (fc_tree, hf_fc_seqcnt, tvb, offset+14, 2, fchdr.seqcnt);
1074     proto_tree_add_uint (fc_tree, hf_fc_oxid, tvb, offset+16, 2, fchdr.oxid);
1075     proto_tree_add_uint (fc_tree, hf_fc_rxid, tvb, offset+18, 2, fchdr.rxid);
1076
1077     if (ftype == FC_FTYPE_LINKCTL) {
1078         if (((fchdr.r_ctl & 0x0F) == FC_LCTL_FRJT) ||
1079             ((fchdr.r_ctl & 0x0F) == FC_LCTL_PRJT) ||
1080             ((fchdr.r_ctl & 0x0F) == FC_LCTL_PBSY)) {
1081             /* In all these cases of Link Ctl frame, the parameter field
1082              * encodes the detailed error message
1083              */
1084             proto_tree_add_uint_format (fc_tree, hf_fc_param, tvb,
1085                                         offset+20, 4, param,
1086                                         "Parameter: 0x%x(%s)", param,
1087                                         fclctl_get_paramstr ((fchdr.r_ctl & 0x0F),
1088                                                              param));
1089         } else {
1090             proto_tree_add_item (fc_tree, hf_fc_param, tvb, offset+20, 4, FALSE);
1091         }
1092     } else if (ftype == FC_FTYPE_BLS) {
1093         if ((fchdr.r_ctl & 0x0F) == FC_BLS_ABTS) {
1094             proto_tree_add_uint_format (fc_tree, hf_fc_param, tvb,
1095                                         offset+20, 4, param,
1096                                         "Parameter: 0x%x(%s)", param,
1097                                         ((param & 0x0F) == 1 ? "Abort Sequence" :
1098                                          "Abort Exchange"));
1099         } else {
1100             proto_tree_add_item (fc_tree, hf_fc_param, tvb, offset+20,
1101                                  4, FALSE);
1102         }
1103     } else {
1104         proto_tree_add_item (fc_tree, hf_fc_param, tvb, offset+20, 4, FALSE);
1105     }
1106
1107     /* Skip the Frame_Header */
1108     next_offset = offset + FC_HEADER_SIZE;
1109
1110     /* Network_Header present? */
1111     if (df_ctl & FC_DFCTL_NH) {
1112         /* Yes - dissect it. */
1113         if (tree) {
1114             proto_tree_add_string (fc_tree, hf_fc_nh_da, tvb, next_offset, 8,
1115                                    fcwwn_to_str (tvb_get_ptr (tvb, offset, 8)));
1116             proto_tree_add_string (fc_tree, hf_fc_nh_sa, tvb, offset+8, 8,
1117                                    fcwwn_to_str (tvb_get_ptr (tvb, offset+8, 8)));
1118         }
1119         next_offset += 16;
1120     }
1121
1122     /* XXX - handle Association_Header and Device_Header here */
1123
1124     if (ftype == FC_FTYPE_LINKCTL) {
1125         /* ACK_1 frames and other LINK_CTL frames echo the last seq bit if the
1126          * packet they're ack'ing did not have it set. So, we'll incorrectly
1127          * flag them as being fragmented when they're not. This fixes the
1128          * problem
1129          */
1130         is_lastframe_inseq = TRUE;
1131     } else {
1132         /* XXX is this right?   offset 20, shouldnt it be offset 9? */
1133         is_exchg_resp = ((tvb_get_guint8 (tvb, offset+20) & 0x80) == 0x80);
1134     }
1135
1136     frag_size = tvb_reported_length (tvb)-FC_HEADER_SIZE;
1137
1138     /* If there is an MDS header, we need to subtract the MDS trailer size */
1139     if ((pinfo->ethertype == ETHERTYPE_UNK) || (pinfo->ethertype == ETHERTYPE_FCFT)) {
1140         frag_size -= MDSHDR_TRAILER_SIZE;
1141     } else if (pinfo->ethertype == ETHERTYPE_BRDWALK) {
1142         frag_size -= 8;         /* 4 byte of FC CRC +
1143                                    4 bytes of error+EOF = 8 bytes  */
1144     }
1145
1146     if (!is_lastframe_inseq) {
1147         /* Show this only as a fragmented FC frame */
1148         if (check_col (pinfo->cinfo, COL_INFO)) {
1149             col_append_str (pinfo->cinfo, COL_INFO, " (Fragmented)");
1150         }
1151     }
1152
1153     /* If this is a fragment, attempt to check if fully reassembled frame is
1154      * present, if we're configured to reassemble.
1155      */
1156     if ((ftype != FC_FTYPE_LINKCTL) && (ftype != FC_FTYPE_BLS) &&
1157         (!is_lastframe_inseq || !is_1frame_inseq) && fc_reassemble &&
1158         tvb_bytes_exist(tvb, FC_HEADER_SIZE, frag_size) && tree) {
1159         /* Add this to the list of fragments */
1160
1161         /* In certain cases such as FICON, the SEQ_CNT is streaming
1162          * i.e. continuously increasing. So, zero does not signify the
1163          * first frame of the sequence. To fix this, we need to save the
1164          * SEQ_CNT of the first frame in sequence and use this value to
1165          * determine the actual offset into a frame.
1166          */
1167         conversation = find_conversation (&pinfo->src, &pinfo->dst,
1168                                           pinfo->ptype, pinfo->oxid,
1169                                           pinfo->rxid, NO_PORT2);
1170         if (!conversation) {
1171             conversation = conversation_new (&pinfo->src, &pinfo->dst,
1172                                              pinfo->ptype, pinfo->oxid,
1173                                              pinfo->rxid, NO_PORT2);
1174         }
1175
1176         ckey.conv_idx = conversation->index;
1177
1178         cdata = (fcseq_conv_data_t *)g_hash_table_lookup (fcseq_req_hash,
1179                                                           &ckey);
1180
1181         if (is_1frame_inseq) {
1182             if (cdata) {
1183                 /* Since we never free the memory used by an exchange, this maybe a
1184                  * case of another request using the same exchange as a previous
1185                  * req.
1186                  */
1187                 cdata->seq_cnt = fchdr.seqcnt;
1188             }
1189             else {
1190                 req_key = g_mem_chunk_alloc (fcseq_req_keys);
1191                 req_key->conv_idx = conversation->index;
1192
1193                 cdata = g_mem_chunk_alloc (fcseq_req_vals);
1194                 cdata->seq_cnt = fchdr.seqcnt;
1195
1196                 g_hash_table_insert (fcseq_req_hash, req_key, cdata);
1197             }
1198             real_seqcnt = 0;
1199         }
1200         else if (cdata != NULL) {
1201             real_seqcnt = fchdr.seqcnt - cdata->seq_cnt ;
1202         }
1203         else {
1204             real_seqcnt = fchdr.seqcnt;
1205         }
1206
1207         frag_id = ((pinfo->oxid << 16) ^ seq_id) | is_exchg_resp ;
1208
1209         /* We assume that all frames are of the same max size */
1210         fcfrag_head = fragment_add (tvb, FC_HEADER_SIZE, pinfo, frag_id,
1211                                     fc_fragment_table,
1212                                     real_seqcnt * fc_max_frame_size,
1213                                     frag_size,
1214                                     !is_lastframe_inseq);
1215
1216         if (fcfrag_head) {
1217             next_tvb = tvb_new_real_data (fcfrag_head->data,
1218                                           fcfrag_head->datalen,
1219                                           fcfrag_head->datalen);
1220             tvb_set_child_real_data_tvbuff(tvb, next_tvb);
1221
1222             /* Add the defragmented data to the data source list. */
1223             add_new_data_source(pinfo, next_tvb, "Reassembled FC");
1224
1225             if (tree) {
1226                 proto_tree_add_boolean_hidden (fc_tree, hf_fc_reassembled,
1227                                                tvb, offset+9, 1, 1);
1228             }
1229         }
1230         else {
1231             if (tree) {
1232                 proto_tree_add_boolean_hidden (fc_tree, hf_fc_reassembled,
1233                                                tvb, offset+9, 1, 0);
1234             }
1235             next_tvb = tvb_new_subset (tvb, next_offset, -1, -1);
1236             call_dissector (data_handle, next_tvb, pinfo, tree);
1237             return;
1238         }
1239     } else {
1240         if (tree) {
1241             proto_tree_add_boolean_hidden (fc_tree, hf_fc_reassembled,
1242                                            tvb, offset+9, 1, 0);
1243         }
1244         next_tvb = tvb_new_subset (tvb, next_offset, -1, -1);
1245     }
1246
1247     if ((ftype != FC_FTYPE_LINKCTL) && (ftype != FC_FTYPE_BLS)) {
1248         if (!dissector_try_port (fcftype_dissector_table, ftype, next_tvb,
1249                                  pinfo, tree)) {
1250             call_dissector (data_handle, next_tvb, pinfo, tree);
1251         }
1252     } else if (ftype == FC_FTYPE_BLS) {
1253         if ((fchdr.r_ctl & 0x0F) == FC_BLS_BAACC) {
1254             dissect_fc_ba_acc (next_tvb, pinfo, tree);
1255         } else if ((fchdr.r_ctl & 0x0F) == FC_BLS_BARJT) {
1256             dissect_fc_ba_rjt (next_tvb, pinfo, tree);
1257         }
1258     }
1259
1260     tap_queue_packet(fc_tap, pinfo, &fchdr);
1261 }
1262
1263
1264 /* Register the protocol with Ethereal */
1265
1266 /* this format is require because a script is used to build the C function
1267    that calls all the protocol registration.
1268 */
1269
1270 void
1271 proto_register_fc(void)
1272 {
1273
1274 /* Setup list of header fields  See Section 1.6.1 for details*/
1275     static hf_register_info hf[] = {
1276         { &hf_fc_rctl,
1277           { "R_CTL", "fc.r_ctl", FT_UINT8, BASE_HEX, NULL, 0x0,
1278             "R_CTL", HFILL }},
1279         { &hf_fc_ftype,
1280           {"Frame type", "fc.ftype", FT_UINT8, BASE_HEX, VALS(fc_ftype_vals),
1281            0x0, "Derived Type", HFILL}},
1282         { &hf_fc_did,
1283           { "Dest Addr", "fc.d_id", FT_STRING, BASE_HEX, NULL, 0x0,
1284             "Destination Address", HFILL}},
1285         { &hf_fc_csctl,
1286           {"CS_CTL", "fc.cs_ctl", FT_UINT8, BASE_HEX, NULL, 0x0,
1287            "CS_CTL", HFILL}},
1288         { &hf_fc_sid,
1289           {"Src Addr", "fc.s_id", FT_STRING, BASE_HEX, NULL, 0x0,
1290            "Source Address", HFILL}},
1291         { &hf_fc_id,
1292           {"Addr", "fc.id", FT_STRING, BASE_HEX, NULL, 0x0,
1293            "Source or Destination Address", HFILL}},
1294         { &hf_fc_type,
1295           {"Type", "fc.type", FT_UINT8, BASE_HEX, VALS (fc_fc4_val), 0x0,
1296            "", HFILL}},
1297         { &hf_fc_fctl,
1298           {"F_CTL", "fc.f_ctl", FT_UINT24, BASE_HEX, NULL, 0x0, "", HFILL}},
1299         { &hf_fc_seqid,
1300           {"SEQ_ID", "fc.seq_id", FT_UINT8, BASE_HEX, NULL, 0x0,
1301            "Sequence ID", HFILL}},
1302         { &hf_fc_dfctl,
1303           {"DF_CTL", "fc.df_ctl", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL}},
1304         { &hf_fc_seqcnt,
1305           {"SEQ_CNT", "fc.seq_cnt", FT_UINT16, BASE_DEC, NULL, 0x0,
1306            "Sequence Count", HFILL}},
1307         { &hf_fc_oxid,
1308           {"OX_ID", "fc.ox_id", FT_UINT16, BASE_HEX, NULL, 0x0, "Originator ID",
1309            HFILL}},
1310         { &hf_fc_rxid,
1311           {"RX_ID", "fc.rx_id", FT_UINT16, BASE_HEX, NULL, 0x0, "Receiver ID",
1312            HFILL}},
1313         { &hf_fc_param,
1314           {"Parameter", "fc.parameter", FT_UINT32, BASE_HEX, NULL, 0x0, "Parameter",
1315            HFILL}},
1316
1317         { &hf_fc_reassembled,
1318           {"Reassembled Frame", "fc.reassembled", FT_BOOLEAN, BASE_HEX, NULL,
1319            0x0, "", HFILL}},
1320         { &hf_fc_nh_da,
1321           {"Network DA", "fc.nethdr.da", FT_STRING, BASE_HEX, NULL,
1322            0x0, "", HFILL}},
1323         { &hf_fc_nh_sa,
1324           {"Network SA", "fc.nethdr.sa", FT_STRING, BASE_HEX, NULL,
1325            0x0, "", HFILL}},
1326
1327         /* Basic Link Svc field definitions */
1328         { &hf_fc_bls_seqid_vld,
1329           {"SEQID Valid", "fc.bls_seqidvld", FT_UINT8, BASE_HEX,
1330            VALS (fc_bls_seqid_val), 0x0, "", HFILL}},
1331         { &hf_fc_bls_lastvld_seqid,
1332           {"Last Valid SEQID", "fc.bls_lastseqid", FT_UINT8, BASE_HEX, NULL,
1333            0x0, "", HFILL}},
1334         { &hf_fc_bls_oxid,
1335           {"OXID", "fc.bls_oxid", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL}},
1336         { &hf_fc_bls_rxid,
1337           {"RXID", "fc.bls_rxid", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL}},
1338         { &hf_fc_bls_lowseqcnt,
1339           {"Low SEQCNT", "fc.bls_lseqcnt", FT_UINT16, BASE_HEX, NULL, 0x0, "",
1340            HFILL}},
1341         { &hf_fc_bls_hiseqcnt,
1342           {"High SEQCNT", "fc.bls_hseqcnt", FT_UINT16, BASE_HEX, NULL, 0x0, "",
1343            HFILL}},
1344         { &hf_fc_bls_rjtcode,
1345           {"Reason", "fc.bls_reason", FT_UINT8, BASE_HEX, VALS(fc_bls_barjt_val),
1346            0x0, "", HFILL}},
1347         { &hf_fc_bls_rjtdetail,
1348           {"Reason Explanantion", "fc.bls_rjtdetail", FT_UINT8, BASE_HEX,
1349            VALS (fc_bls_barjt_det_val), 0x0, "", HFILL}},
1350         { &hf_fc_bls_vendor,
1351           {"Vendor Unique Reason", "fc.bls_vnduniq", FT_UINT8, BASE_HEX, NULL,
1352            0x0, "", HFILL}},
1353         { &hf_fc_fctl_exchange_responder,
1354           {"ExgRpd", "fc.fctl.exchange_responder", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_exchange_responder),
1355            FC_FCTL_EXCHANGE_RESPONDER, "Exchange Responder?", HFILL}},
1356         { &hf_fc_fctl_seq_recipient,
1357           {"SeqRec", "fc.fctl.seq_recipient", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_seq_recipient),
1358            FC_FCTL_SEQ_RECIPIENT, "Seq Recipient?", HFILL}},
1359         { &hf_fc_fctl_exchange_first,
1360           {"ExgFst", "fc.fctl.exchange_first", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_exchange_first),
1361            FC_FCTL_EXCHANGE_FIRST, "First Exchange?", HFILL}},
1362         { &hf_fc_fctl_exchange_last,
1363           {"ExgLst", "fc.fctl.exchange_last", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_exchange_last),
1364            FC_FCTL_EXCHANGE_LAST, "Last Exchange?", HFILL}},
1365         { &hf_fc_fctl_seq_last,
1366           {"SeqLst", "fc.fctl.seq_last", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_seq_last),
1367            FC_FCTL_SEQ_LAST, "Last Sequence?", HFILL}},
1368         { &hf_fc_fctl_priority,
1369           {"Pri", "fc.fctl.priority", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_priority),
1370            FC_FCTL_PRIORITY, "Priority", HFILL}},
1371         { &hf_fc_fctl_transfer_seq_initiative,
1372           {"TSI", "fc.fctl.transfer_seq_initiative", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_transfer_seq_initiative),
1373            FC_FCTL_TRANSFER_SEQ_INITIATIVE, "Transfer Seq Initiative", HFILL}},
1374         { &hf_fc_fctl_rexmitted_seq,
1375           {"RetSeq", "fc.fctl.rexmitted_seq", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_rexmitted_seq),
1376            FC_FCTL_REXMITTED_SEQ, "Retransmitted Sequence", HFILL}},
1377         { &hf_fc_fctl_rel_offset,
1378           {"RelOff", "fc.fctl.rel_offset", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_rel_offset),
1379            FC_FCTL_REL_OFFSET, "rel offset", HFILL}},
1380         { &hf_fc_fctl_last_data_frame,
1381           {"LDF", "fc.fctl.last_data_frame", FT_UINT24, BASE_HEX, VALS(last_data_frame_vals),
1382            FC_FCTL_LAST_DATA_FRAME_MASK, "Last Data Frame?", HFILL}},
1383         { &hf_fc_fctl_ack_0_1,
1384           {"A01", "fc.fctl.ack_0_1", FT_UINT24, BASE_HEX, VALS(ack_0_1_vals),
1385            FC_FCTL_ACK_0_1_MASK, "Ack 0/1 value", HFILL}},
1386         { &hf_fc_fctl_abts_ack,
1387           {"AA", "fc.fctl.abts_ack", FT_UINT24, BASE_HEX, VALS(abts_ack_vals),
1388            FC_FCTL_ABTS_MASK, "ABTS ACK values", HFILL}},
1389         { &hf_fc_fctl_abts_not_ack,
1390           {"AnA", "fc.fctl.abts_not_ack", FT_UINT24, BASE_HEX, VALS(abts_not_ack_vals),
1391            FC_FCTL_ABTS_MASK, "ABTS not ACK vals", HFILL}},
1392         { &hf_fc_exchange_first_frame,
1393           { "Exchange First In", "fc.exchange_first_frame", FT_FRAMENUM, BASE_NONE, NULL,
1394            0, "The first frame of this exchange is in this frame", HFILL }},
1395         { &hf_fc_exchange_last_frame,
1396           { "Exchange Last In", "fc.exchange_last_frame", FT_FRAMENUM, BASE_NONE, NULL,
1397            0, "The last frame of this exchange is in this frame", HFILL }},
1398         { &hf_fc_time,
1399           { "Time from Exchange First", "fc.time", FT_RELATIVE_TIME, BASE_NONE, NULL,
1400            0, "Time since the first frame of the Exchange", HFILL }},
1401         { &hf_fc_eisl,
1402           {"EISL Header", "fc.eisl", FT_BYTES, BASE_HEX, NULL, 0, "EISL Header", HFILL}},
1403     };
1404
1405     /* Setup protocol subtree array */
1406     static gint *ett[] = {
1407         &ett_fc,
1408         &ett_fcbls,
1409         &ett_fctl
1410     };
1411
1412     module_t *fc_module;
1413
1414     /* Register the protocol name and description */
1415     proto_fc = proto_register_protocol ("Fibre Channel", "FC", "fc");
1416     register_dissector ("fc", dissect_fc, proto_fc);
1417     fc_tap = register_tap("fc");
1418
1419     /* Required function calls to register the header fields and subtrees used */
1420     proto_register_field_array(proto_fc, hf, array_length(hf));
1421     proto_register_subtree_array(ett, array_length(ett));
1422
1423     fcftype_dissector_table = register_dissector_table ("fc.ftype",
1424                                                         "FC Frame Type",
1425                                                         FT_UINT8, BASE_HEX);
1426
1427     /* Register preferences */
1428     fc_module = prefs_register_protocol (proto_fc, NULL);
1429     prefs_register_bool_preference (fc_module,
1430                                     "reassemble",
1431                                     "Reassemble multi-frame sequences",
1432                                     "If enabled, reassembly of multi-frame "
1433                                     "sequences is done",
1434                                     &fc_reassemble);
1435     prefs_register_uint_preference (fc_module,
1436                                     "max_frame_size", "Max FC Frame Size",
1437                                     "This is the size of non-last frames in a "
1438                                     "multi-frame sequence", 10,
1439                                     &fc_max_frame_size);
1440
1441     register_init_routine(fc_defragment_init);
1442     register_init_routine (fc_exchange_init_protocol);
1443 }
1444
1445
1446 /* If this dissector uses sub-dissector registration add a registration routine.
1447    This format is required because a script is used to find these routines and
1448    create the code that calls these routines.
1449 */
1450 void
1451 proto_reg_handoff_fc (void)
1452 {
1453     data_handle = find_dissector("data");
1454 }