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 1.16 2003/10/30 02:06:11 guy 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
 113 /* Network_Header fields */
 114 static int hf_fc_nh_da = -1;
 115 static int hf_fc_nh_sa = -1;
 116
 117 /* For Basic Link Svc */
 118 static int hf_fc_bls_seqid_vld = -1;
 119 static int hf_fc_bls_lastvld_seqid = -1;
 120 static int hf_fc_bls_oxid = -1;
 121 static int hf_fc_bls_rxid = -1;
 122 static int hf_fc_bls_lowseqcnt = -1;
 123 static int hf_fc_bls_hiseqcnt = -1;
 124 static int hf_fc_bls_rjtcode = -1;
 125 static int hf_fc_bls_rjtdetail = -1;
 126 static int hf_fc_bls_vendor = -1;
 127
 128
 129 /* Initialize the subtree pointers */
 130 static gint ett_fc = -1;
 131 static gint ett_fctl = -1;
 132 static gint ett_fcbls = -1;
 133
 134 static dissector_table_t fcftype_dissector_table;
 135 static dissector_handle_t data_handle;
 136
 137 static int fc_tap = -1;
 138
 139 /* Reassembly stuff */
 140 static gboolean fc_reassemble = TRUE;
 141 static guint32  fc_max_frame_size = 1024;
 142 static GHashTable *fc_fragment_table = NULL;
 143
 144 typedef struct _fcseq_conv_key {
 145     guint32 conv_idx;
 146 } fcseq_conv_key_t;
 147
 148 typedef struct _fcseq_conv_data {
 149     guint32 seq_cnt;
 150 } fcseq_conv_data_t;
 151
 152 GHashTable *fcseq_req_hash = NULL;
 153 GMemChunk *fcseq_req_keys = NULL;
 154 GMemChunk *fcseq_req_vals = NULL;
 155 guint32 fcseq_init_count = 25;
 156
 157 static GHashTable *fc_exchange_unmatched = NULL;
 158 static GHashTable *fc_exchange_matched = NULL;
 159 static GMemChunk *fc_exchange_vals = NULL;
 160 static guint32 fc_exchange_init_count = 200;
 161
 162 /*
 163  * Hash Functions
 164  */
 165 static gint
 166 fcseq_equal(gconstpointer v, gconstpointer w)
 167 {
 168   fcseq_conv_key_t *v1 = (fcseq_conv_key_t *)v;
 169   fcseq_conv_key_t *v2 = (fcseq_conv_key_t *)w;
 170
 171   return (v1->conv_idx == v2->conv_idx);
 172 }
 173
 174 static guint
 175 fcseq_hash (gconstpointer v)
 176 {
 177     fcseq_conv_key_t *key = (fcseq_conv_key_t *)v;
 178     guint val;
 179
 180     val = key->conv_idx;
 181
 182     return val;
 183 }
 184
 185 static guint
 186 fc_exchange_hash_unmatched(gconstpointer v)
 187 {
 188     const fc_exchange_data *fced=(const fc_exchange_data *)v;
 189
 190     return fced->oxid;
 191 }
 192 static gint
 193 fc_exchange_equal_unmatched(gconstpointer v1, gconstpointer v2)
 194 {
 195     const fc_exchange_data *fced1=(const fc_exchange_data *)v1;
 196     const fc_exchange_data *fced2=(const fc_exchange_data *)v2;
 197
 198     /* oxid must match */
 199     if(fced1->oxid!=fced2->oxid){
 200         return 0;
 201     }
 202     /* compare s_id, d_id and treat the fc address
 203        s_id==00.00.00 as a wildcard matching anything */
 204     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) ){
 205         return 0;
 206     }
 207     if(CMP_ADDRESS(&fced1->d_id, &fced2->d_id)){
 208         return 0;
 209     }
 210
 211     return 1;
 212 }
 213
 214 static guint
 215 fc_exchange_hash_matched(gconstpointer v)
 216 {
 217     const fc_exchange_data *fced=(const fc_exchange_data *)v;
 218
 219     return fced->oxid;
 220 }
 221 static gint
 222 fc_exchange_equal_matched(gconstpointer v1, gconstpointer v2)
 223 {
 224     const fc_exchange_data *fced1=(const fc_exchange_data *)v1;
 225     const fc_exchange_data *fced2=(const fc_exchange_data *)v2;
 226     guint32 fef1, fef2, lef1, lef2;
 227
 228     /* oxid must match */
 229     if(fced1->oxid!=fced2->oxid){
 230         return 0;
 231     }
 232     fef1=fced1->first_exchange_frame;
 233     fef2=fced2->first_exchange_frame;
 234     lef1=fced1->last_exchange_frame;
 235     lef2=fced2->last_exchange_frame;
 236     if(!fef1)fef1=fef2;
 237     if(!fef2)fef2=fef1;
 238     if(!lef1)lef1=lef2;
 239     if(!lef2)lef2=lef1;
 240
 241     if(fef1!=fef2){
 242         return 0;
 243     }
 244     if(lef1!=lef2){
 245         return 0;
 246     }
 247
 248     return 1;
 249 }
 250
 251 static void
 252 fc_exchange_init_protocol(void)
 253 {
 254     if(fc_exchange_vals){
 255         g_mem_chunk_destroy(fc_exchange_vals);
 256         fc_exchange_vals=NULL;
 257     }
 258     if(fc_exchange_unmatched){
 259         g_hash_table_destroy(fc_exchange_unmatched);
 260         fc_exchange_unmatched=NULL;
 261     }
 262     if(fc_exchange_matched){
 263         g_hash_table_destroy(fc_exchange_matched);
 264         fc_exchange_matched=NULL;
 265     }
 266
 267     fc_exchange_unmatched=g_hash_table_new(fc_exchange_hash_unmatched, fc_exchange_equal_unmatched);
 268     fc_exchange_matched=g_hash_table_new(fc_exchange_hash_matched, fc_exchange_equal_matched);
 269     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);
 270
 271     fragment_table_init(&fc_fragment_table);
 272
 273     if (fcseq_req_keys)
 274         g_mem_chunk_destroy (fcseq_req_keys);
 275     if (fcseq_req_vals)
 276         g_mem_chunk_destroy (fcseq_req_vals);
 277     if (fcseq_req_hash)
 278         g_hash_table_destroy(fcseq_req_hash);
 279
 280     fcseq_req_hash = g_hash_table_new(fcseq_hash, fcseq_equal);
 281     fcseq_req_keys = g_mem_chunk_new ("fcseq_req_keys",
 282                                       sizeof(fcseq_conv_key_t),
 283                                       fcseq_init_count *
 284                                       sizeof(fcseq_conv_key_t),
 285                                       G_ALLOC_AND_FREE);
 286     fcseq_req_vals = g_mem_chunk_new ("fcseq_req_vals",
 287                                       sizeof(fcseq_conv_data_t),
 288                                       fcseq_init_count *
 289                                       sizeof(fcseq_conv_data_t),
 290                                       G_ALLOC_AND_FREE);
 291 }
 292
 293
 294 const value_string fc_fc4_val[] = {
 295     {FC_TYPE_ELS,        "Ext Link Svc"},
 296     {FC_TYPE_LLCSNAP,    "LLC_SNAP"},
 297     {FC_TYPE_IP,         "IP/FC"},
 298     {FC_TYPE_SCSI,       "FCP"},
 299     {FC_TYPE_FCCT,       "FC_CT"},
 300     {FC_TYPE_SWILS,      "SW_ILS"},
 301     {FC_TYPE_AL,         "AL"},
 302     {FC_TYPE_SNMP,       "SNMP"},
 303     {FC_TYPE_SB_FROM_CU, "SB-3(CU->Channel)"},
 304     {FC_TYPE_SB_TO_CU,   "SB-3(Channel->CU)"},
 305     {0, NULL},
 306 };
 307
 308 static const value_string fc_ftype_vals [] = {
 309     {FC_FTYPE_UNDEF ,    "Unknown frame"},
 310     {FC_FTYPE_SWILS,     "SW_ILS"},
 311     {FC_FTYPE_IP ,       "IP/FC"},
 312     {FC_FTYPE_SCSI ,     "FCP"},
 313     {FC_FTYPE_BLS ,      "Basic Link Svc"},
 314     {FC_FTYPE_ELS ,      "ELS"},
 315     {FC_FTYPE_FCCT ,     "FC_CT"},
 316     {FC_FTYPE_LINKDATA,  "Link Data"},
 317     {FC_FTYPE_VDO,       "Video Data"},
 318     {FC_FTYPE_LINKCTL,   "Link Ctl"},
 319     {FC_FTYPE_SBCCS,     "SBCCS"},
 320     {0, NULL},
 321 };
 322
 323 static const value_string fc_wka_vals[] = {
 324     {FC_WKA_MULTICAST,    "Multicast Server"},
 325     {FC_WKA_CLKSYNC,      "Clock Sync Server"},
 326     {FC_WKA_KEYDIST,      "Key Distribution Server"},
 327     {FC_WKA_ALIAS,        "Alias Server"},
 328     {FC_WKA_QOSF,         "QoS Facilitator"},
 329     {FC_WKA_MGMT,         "Management Server"},
 330     {FC_WKA_TIME,         "Time Server"},
 331     {FC_WKA_DNS,          "Directory Server"},
 332     {FC_WKA_FABRIC_CTRLR, "Fabric Ctlr"},
 333     {FC_WKA_FPORT,        "F_Port Server"},
 334     {FC_WKA_BCAST,        "Broadcast ID"},
 335     {0, NULL},
 336 };
 337
 338 static const value_string fc_routing_val[] = {
 339     {FC_RCTL_DEV_DATA,  "Device_Data"},
 340     {FC_RCTL_ELS,       "Extended Link Services"},
 341     {FC_RCTL_LINK_DATA, "FC-4 Link_Data"},
 342     {FC_RCTL_VIDEO,     "Video_Data"},
 343     {FC_RCTL_BLS,       "Basic Link Services"},
 344     {FC_RCTL_LINK_CTL,  "Link_Control Frame"},
 345     {0, NULL},
 346 };
 347
 348 static const value_string fc_iu_val[] = {
 349     {FC_IU_UNCATEGORIZED   , "Uncategorized Data"},
 350     {FC_IU_SOLICITED_DATA  , "Solicited Data"},
 351     {FC_IU_UNSOLICITED_CTL , "Unsolicited Control"},
 352     {FC_IU_SOLICITED_CTL   , "Solicited Control"},
 353     {FC_IU_UNSOLICITED_DATA, "Solicited Data"},
 354     {FC_IU_DATA_DESCRIPTOR , "Data Descriptor"},
 355     {FC_IU_UNSOLICITED_CMD , "Unsolicited Command"},
 356     {FC_IU_CMD_STATUS      , "Command Status"},
 357     {0, NULL},
 358 };
 359
 360
 361 static void fc_defragment_init(void)
 362 {
 363   fragment_table_init(&fc_fragment_table);
 364 }
 365
 366
 367 static gchar *
 368 fctl_to_str (const guint8 *fctl, gchar *str, gboolean is_ack)
 369 {
 370     int stroff = 0;
 371     guint8 tmp = 0;
 372
 373     if (str == NULL)
 374         return (str);
 375
 376     if (fctl[2] & 0x80) {
 377         strcpy (str, "Exchange Responder, ");
 378         stroff += 20;
 379     }
 380     else {
 381         strcpy (str, "Exchange Originator, ");
 382         stroff += 21;
 383     }
 384
 385     if (fctl[2] & 0x40) {
 386         strcpy (&str[stroff], "Seq Recipient, ");
 387         stroff += 15;
 388     }
 389     else {
 390         strcpy (&str[stroff], "Seq Initiator, ");
 391         stroff += 15;
 392     }
 393
 394     if (fctl[2] & 0x20) {
 395         strcpy (&str[stroff], "Exchg First, ");
 396         stroff += 13;
 397     }
 398
 399     if (fctl[2] & 0x10) {
 400         strcpy (&str[stroff], "Exchg Last, ");
 401         stroff += 12;
 402     }
 403
 404     if (fctl[2] & 0x8) {
 405         strcpy (&str[stroff], "Seq Last, ");
 406         stroff += 10;
 407     }
 408
 409     if (fctl[2] & 0x2) {
 410         strcpy (&str[stroff], "Priority, ");
 411         stroff += 10;
 412     }
 413     else {
 414         strcpy (&str[stroff], "CS_CTL, ");
 415         stroff += 8;
 416     }
 417
 418     if (fctl[2] & 0x1) {
 419         strcpy (&str[stroff], "Transfer Seq Initiative, ");
 420         stroff += 25;
 421     }
 422
 423     if (fctl[1] & 0x30) {
 424         strcpy (&str[stroff], "ACK_0 Reqd, ");
 425         stroff += 12;
 426     }
 427     else if (fctl[1] & 0x10) {
 428         strcpy (&str[stroff], "ACK_1 Reqd, ");
 429         stroff += 12;
 430     }
 431
 432     if (fctl[1] & 0x2) {
 433         strcpy (&str[stroff], "Rexmitted Seq, ");
 434         stroff += 15;
 435     }
 436
 437     tmp = fctl[0] & 0xC0;
 438     switch (tmp) {
 439     case 0:
 440         strcpy (&str[stroff], "Last Data Frame - No Info, ");
 441         stroff += 27;
 442         break;
 443     case 1:
 444         strcpy (&str[stroff], "Last Data Frame - Seq Imm, ");
 445         stroff += 27;
 446         break;
 447     case 2:
 448         strcpy (&str[stroff], "Last Data Frame - Seq Soon, ");
 449         stroff += 28;
 450         break;
 451     case 3:
 452         strcpy (&str[stroff], "Last Data Frame - Seq Delyd, ");
 453         stroff += 29;
 454         break;
 455     }
 456
 457     tmp = fctl[0] & 0x30;
 458     switch (tmp) {
 459     case 0:
 460         if (is_ack) {
 461             strcpy (&str[stroff], "ABTS - Cont, ");
 462             stroff += 13;
 463         }
 464         else {
 465             strcpy (&str[stroff], "ABTS - Abort/MS, ");
 466             stroff += 17;
 467         }
 468         break;
 469     case 0x10:
 470         if (is_ack) {
 471             strcpy (&str[stroff], "ABTS - AbortABTS - Abort, ");
 472             stroff += 14;
 473         }
 474         else {
 475             strcpy (&str[stroff], "ABTS - Abort/SS, ");
 476             stroff += 17;
 477         }
 478         break;
 479     case 0x20:
 480         if (is_ack) {
 481             strcpy (&str[stroff], "ABTS - Stop, ");
 482             stroff += 13;
 483         }
 484         else {
 485             strcpy (&str[stroff], "ABTS - Process/IB, ");
 486             stroff += 19;
 487         }
 488         break;
 489     case 0x30:
 490         if (is_ack) {
 491             strcpy (&str[stroff], "ABTS - Imm Seq Retx, ");
 492             stroff += 21;
 493         }
 494         else {
 495             strcpy (&str[stroff], "ABTS - Discard/MS/Imm Retx, ");
 496             stroff += 28;
 497         }
 498         break;
 499     }
 500
 501     if (fctl[0] & 0x8) {
 502         strcpy (&str[stroff], "Rel Offset = 1");
 503         stroff += 14;
 504     }
 505
 506     return (str);
 507 }
 508
 509 /* BA_ACC & BA_RJT are decoded in this file itself instead of a traditional
 510  * dedicated file and dissector format because the dissector would require some
 511  * fields of the FC_HDR such as param in some cases, type in some others, the
 512  * lower 4 bits of r_ctl in some other cases etc. So, we decode BLS & Link Ctl
 513  * in this file itself.
 514  */
 515 static void
 516 dissect_fc_ba_acc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 517 {
 518     /* Set up structures needed to add the protocol subtree and manage it */
 519     proto_item *ti;
 520     proto_tree *acc_tree;
 521     int offset = 0;
 522
 523     /* Make entries in Protocol column and Info column on summary display */
 524     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 525         col_set_str(pinfo->cinfo, COL_PROTOCOL, "BLS");
 526
 527     if (check_col(pinfo->cinfo, COL_INFO))
 528         col_set_str(pinfo->cinfo, COL_INFO, "BA_ACC");
 529
 530     if (tree) {
 531         ti = proto_tree_add_text (tree, tvb, 0, tvb_length (tvb), "Basic Link Svc");
 532         acc_tree = proto_item_add_subtree (ti, ett_fcbls);
 533
 534         proto_tree_add_item (acc_tree, hf_fc_bls_seqid_vld, tvb, offset++, 1, FALSE);
 535         proto_tree_add_item (acc_tree, hf_fc_bls_lastvld_seqid, tvb, offset++, 1, FALSE);
 536         offset += 2; /* Skip reserved field */
 537         proto_tree_add_item (acc_tree, hf_fc_bls_oxid, tvb, offset, 2, FALSE);
 538         offset += 2;
 539         proto_tree_add_item (acc_tree, hf_fc_bls_rxid, tvb, offset, 2, FALSE);
 540         offset += 2;
 541         proto_tree_add_item (acc_tree, hf_fc_bls_lowseqcnt, tvb, offset, 2, FALSE);
 542         offset += 2;
 543         proto_tree_add_item (acc_tree, hf_fc_bls_hiseqcnt, tvb, offset, 2, FALSE);
 544     }
 545 }
 546
 547 static void
 548 dissect_fc_ba_rjt (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 549 {
 550     /* Set up structures needed to add the protocol subtree and manage it */
 551     proto_item *ti;
 552     proto_tree *rjt_tree;
 553     int offset = 0;
 554
 555     /* Make entries in Protocol column and Info column on summary display */
 556     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 557         col_set_str(pinfo->cinfo, COL_PROTOCOL, "BLS");
 558
 559     if (check_col(pinfo->cinfo, COL_INFO))
 560         col_set_str(pinfo->cinfo, COL_INFO, "BA_RJT");
 561
 562     if (tree) {
 563         ti = proto_tree_add_text (tree, tvb, 0, tvb_length (tvb), "Basic Link Svc");
 564         rjt_tree = proto_item_add_subtree (ti, ett_fcbls);
 565
 566         proto_tree_add_item (rjt_tree, hf_fc_bls_rjtcode, tvb, offset+1, 1, FALSE);
 567         proto_tree_add_item (rjt_tree, hf_fc_bls_rjtdetail, tvb, offset+2, 1, FALSE);
 568         proto_tree_add_item (rjt_tree, hf_fc_bls_vendor, tvb, offset+3, 1, FALSE);
 569     }
 570 }
 571
 572 static guint8
 573 fc_get_ftype (guint8 r_ctl, guint8 type)
 574 {
 575     /* A simple attempt to determine the upper level protocol based on the
 576      * r_ctl & type fields.
 577      */
 578     switch (r_ctl & 0xF0) {
 579     case FC_RCTL_DEV_DATA:
 580         switch (type) {
 581         case FC_TYPE_SWILS:
 582             if ((r_ctl == 0x2) || (r_ctl == 0x3))
 583                 return FC_FTYPE_SWILS;
 584             else
 585                 return FC_FTYPE_UNDEF;
 586         case FC_TYPE_IP:
 587             return FC_FTYPE_IP;
 588         case FC_TYPE_SCSI:
 589             return FC_FTYPE_SCSI;
 590         case FC_TYPE_FCCT:
 591             return FC_FTYPE_FCCT;
 592         case FC_TYPE_SB_FROM_CU:
 593         case FC_TYPE_SB_TO_CU:
 594             return FC_FTYPE_SBCCS;
 595         default:
 596             return FC_FTYPE_UNDEF;
 597         }
 598         break;
 599     case FC_RCTL_ELS:
 600         if (((r_ctl & 0x0F) == 0x2) || ((r_ctl & 0x0F) == 0x3))
 601             return FC_FTYPE_ELS;
 602         else
 603             return FC_FTYPE_UNDEF;
 604         break;
 605     case FC_RCTL_LINK_DATA:
 606         return FC_FTYPE_LINKDATA;
 607         break;
 608     case FC_RCTL_VIDEO:
 609         return FC_FTYPE_VDO;
 610         break;
 611     case FC_RCTL_BLS:
 612         if (type == 0)
 613             return FC_FTYPE_BLS;
 614         else
 615             return FC_FTYPE_UNDEF;
 616         break;
 617     case FC_RCTL_LINK_CTL:
 618         return FC_FTYPE_LINKCTL;
 619         break;
 620     default:
 621         return FC_FTYPE_UNDEF;
 622         break;
 623     }
 624 }
 625
 626 static const value_string abts_ack_vals[] = {
 627         {0x000000,      "ABTS - Cont"},
 628         {0x000010,      "ABTS - Abort"},
 629         {0x000020,      "ABTS - Stop"},
 630         {0x000030,      "ABTS - Imm Seq Retx"},
 631         {0,NULL}
 632 };
 633 static const value_string abts_not_ack_vals[] = {
 634         {0x000000,      "ABTS - Abort/MS"},
 635         {0x000010,      "ABTS - Abort/SS"},
 636         {0x000020,      "ABTS - Process/IB"},
 637         {0x000030,      "ABTS - Discard/MS/Imm Retx"},
 638         {0,NULL}
 639 };
 640 static const value_string last_data_frame_vals[] = {
 641         {0x000000,      "Last Data Frame - No Info"},
 642         {0x004000,      "Last Data Frame - Seq Imm"},
 643         {0x008000,      "Last Data Frame - Seq Soon"},
 644         {0x00c000,      "Last Data Frame - Seq Delyd"},
 645         {0,NULL}
 646 };
 647 static const value_string ack_0_1_vals[] = {
 648         {0x003000,      "ACK_0 Required"},
 649         {0x002000,      "ACK_0 Required"},
 650         {0x001000,      "ACK_1 Required"},
 651         {0x000000,      "no ack required"},
 652         {0,NULL}
 653 };
 654 static const true_false_string tfs_fc_fctl_exchange_responder = {
 655         "Exchange Responder",
 656         "Exchange Originator"
 657 };
 658 static const true_false_string tfs_fc_fctl_seq_recipient = {
 659         "Seq Recipient",
 660         "Seq Initiator"
 661 };
 662 static const true_false_string tfs_fc_fctl_exchange_first = {
 663         "Exchg First",
 664         "NOT exchg first"
 665 };
 666 static const true_false_string tfs_fc_fctl_exchange_last = {
 667         "Exchg Last",
 668         "NOT exchg last"
 669 };
 670 static const true_false_string tfs_fc_fctl_seq_last = {
 671         "Seq Last",
 672         "NOT seq last"
 673 };
 674 static const true_false_string tfs_fc_fctl_priority = {
 675         "Priority",
 676         "CS_CTL"
 677 };
 678 static const true_false_string tfs_fc_fctl_transfer_seq_initiative = {
 679         "Transfer Seq Initiative",
 680         "NOT transfer seq initiative"
 681 };
 682 static const true_false_string tfs_fc_fctl_rexmitted_seq = {
 683         "Retransmitted Sequence",
 684         "NOT retransmitted sequence"
 685 };
 686 static const true_false_string tfs_fc_fctl_rel_offset = {
 687         "Rel Offset SET",
 688         "rel offset NOT set"
 689 };
 690
 691
 692
 693
 694 /* code to dissect the  F_CTL bitmask */
 695 static void
 696 dissect_fc_fctl(packet_info *pinfo _U_, proto_tree *parent_tree, tvbuff_t *tvb, int offset, gboolean is_ack, guint32 fctl)
 697 {
 698         proto_item *item;
 699         proto_tree *tree;
 700         gchar str[256];
 701
 702         item=proto_tree_add_uint(parent_tree, hf_fc_fctl, tvb, offset, 3, fctl);
 703         tree=proto_item_add_subtree(item, ett_fctl);
 704
 705
 706         proto_tree_add_boolean(tree, hf_fc_fctl_exchange_responder, tvb, offset, 3, fctl);
 707
 708         proto_tree_add_boolean(tree, hf_fc_fctl_seq_recipient, tvb, offset, 3, fctl);
 709
 710         proto_tree_add_boolean(tree, hf_fc_fctl_exchange_first, tvb, offset, 3, fctl);
 711
 712         proto_tree_add_boolean(tree, hf_fc_fctl_exchange_last, tvb, offset, 3, fctl);
 713
 714         proto_tree_add_boolean(tree, hf_fc_fctl_seq_last, tvb, offset, 3, fctl);
 715
 716         proto_tree_add_boolean(tree, hf_fc_fctl_priority, tvb, offset, 3, fctl);
 717
 718         proto_tree_add_boolean(tree, hf_fc_fctl_transfer_seq_initiative, tvb, offset, 3, fctl);
 719
 720         proto_tree_add_uint(tree, hf_fc_fctl_last_data_frame, tvb, offset, 3, fctl);
 721
 722         proto_tree_add_uint(tree, hf_fc_fctl_ack_0_1, tvb, offset, 3, fctl);
 723
 724
 725         proto_tree_add_boolean(tree, hf_fc_fctl_rexmitted_seq, tvb, offset, 3, fctl);
 726
 727         if(is_ack){
 728                 proto_tree_add_uint(tree, hf_fc_fctl_abts_ack, tvb, offset, 3, fctl);
 729         } else {
 730                 proto_tree_add_uint(tree, hf_fc_fctl_abts_ack, tvb, offset, 3, fctl);
 731         }
 732
 733         proto_tree_add_boolean(tree, hf_fc_fctl_rel_offset, tvb, offset, 3, fctl);
 734
 735         fctl_to_str( ((guint8 *)&fctl), str, is_ack);
 736         proto_item_append_text(item, "  %s", str);
 737 }
 738
 739 static const value_string fc_bls_proto_val[] = {
 740     {FC_BLS_NOP    , "NOP"},
 741     {FC_BLS_ABTS   , "ABTS"},
 742     {FC_BLS_RMC    , "RMC"},
 743     {FC_BLS_BAACC  , "BA_ACC"},
 744     {FC_BLS_BARJT  , "BA_RJT"},
 745     {FC_BLS_PRMT   , "PRMT"},
 746     {0, NULL},
 747 };
 748
 749 static const value_string fc_els_proto_val[] = {
 750     {0x01    , "Solicited Data"},
 751     {0x02    , "Request"},
 752     {0x03    , "Reply"},
 753     {0, NULL},
 754 };
 755
 756 /* Code to actually dissect the packets */
 757 static void
 758 dissect_fc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 759 {
 760    /* Set up structures needed to add the protocol subtree and manage it */
 761     proto_item *ti=NULL;
 762     proto_tree *fc_tree = NULL;
 763     tvbuff_t *next_tvb;
 764     int offset = 0, next_offset;
 765     gboolean is_lastframe_inseq, is_1frame_inseq, is_valid_frame;
 766     gboolean is_exchg_resp = 0;
 767     fragment_data *fcfrag_head;
 768     guint32 frag_id;
 769     guint32 frag_size;
 770     guint8 df_ctl, seq_id;
 771
 772     guint32 param;
 773     guint16 real_seqcnt;
 774     guint8 ftype;
 775     gboolean is_ack;
 776
 777     static fc_hdr fchdr;
 778     fc_exchange_data *fc_ex=NULL;
 779
 780     conversation_t *conversation;
 781     fcseq_conv_data_t *cdata;
 782     fcseq_conv_key_t ckey, *req_key;
 783
 784     fchdr.fced=NULL;
 785
 786     /* Make entries in Protocol column and Info column on summary display */
 787     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 788         col_set_str(pinfo->cinfo, COL_PROTOCOL, "FC");
 789
 790     fchdr.r_ctl = tvb_get_guint8 (tvb, offset);
 791
 792     /* If the R_CTL is the EISL field, skip the first 8 bytes to retrieve the
 793      * real FC header. EISL is Cisco-proprietary and is not decoded.
 794      */
 795     if (fchdr.r_ctl == FC_RCTL_EISL) {
 796         offset += 8;
 797         fchdr.r_ctl = tvb_get_guint8 (tvb, offset);
 798     }
 799
 800     SET_ADDRESS (&pinfo->dst, AT_FC, 3, tvb_get_ptr(tvb,offset+1,3));
 801     SET_ADDRESS (&fchdr.d_id, AT_FC, 3, tvb_get_ptr(tvb,offset+1,3));
 802     SET_ADDRESS (&pinfo->src, AT_FC, 3, tvb_get_ptr(tvb,offset+5,3));
 803     SET_ADDRESS (&fchdr.s_id, AT_FC, 3, tvb_get_ptr(tvb,offset+5,3));
 804     fchdr.cs_ctl = tvb_get_guint8 (tvb, offset+4);
 805     fchdr.type  = tvb_get_guint8 (tvb, offset+8);
 806     fchdr.fctl=tvb_get_ntoh24(tvb,offset+9);
 807     fchdr.seqcnt = tvb_get_ntohs (tvb, offset+14);
 808     fchdr.oxid=tvb_get_ntohs(tvb,offset+16);
 809     fchdr.rxid=tvb_get_ntohs(tvb,offset+18);
 810     param = tvb_get_ntohl (tvb, offset+20);
 811     seq_id = tvb_get_guint8 (tvb, offset+12);
 812
 813     pinfo->oxid = fchdr.oxid;
 814     pinfo->rxid = fchdr.rxid;
 815     pinfo->ptype = PT_EXCHG;
 816     pinfo->r_ctl = fchdr.r_ctl;
 817
 818     is_ack = ((fchdr.r_ctl == 0xC0) || (fchdr.r_ctl == 0xC1));
 819
 820     /* There are two ways to determine if this is the first frame of a
 821      * sequence. Either:
 822      * (i) The SOF bits indicate that this is the first frame OR
 823      * (ii) This is an SOFf frame and seqcnt is 0.
 824      */
 825     is_1frame_inseq = (((pinfo->sof_eof & PINFO_SOF_FIRST_FRAME) == PINFO_SOF_FIRST_FRAME) ||
 826                        (((pinfo->sof_eof & PINFO_SOF_SOFF) == PINFO_SOF_SOFF) &&
 827                         (fchdr.seqcnt == 0)));
 828
 829     is_lastframe_inseq = ((pinfo->sof_eof & PINFO_EOF_LAST_FRAME) == PINFO_EOF_LAST_FRAME);
 830
 831     if ((pinfo->sof_eof & PINFO_SOF_SOFF) == PINFO_SOF_SOFF) {
 832         is_lastframe_inseq = fchdr.fctl & FC_FCTL_SEQ_LAST;
 833     }
 834     is_valid_frame = ((pinfo->sof_eof & 0x40) == 0x40);
 835
 836     ftype = fc_get_ftype (fchdr.r_ctl, fchdr.type);
 837
 838     if (check_col (pinfo->cinfo, COL_INFO)) {
 839         col_add_str (pinfo->cinfo, COL_INFO, match_strval (ftype, fc_ftype_vals));
 840
 841         if (ftype == FC_FTYPE_LINKCTL)
 842             col_append_fstr (pinfo->cinfo, COL_INFO, ", %s",
 843                              match_strval ((fchdr.r_ctl & 0x0F),
 844                                            fc_lctl_proto_val));
 845     }
 846
 847     /* In the interest of speed, if "tree" is NULL, don't do any work not
 848        necessary to generate protocol tree items. */
 849     if (tree) {
 850         ti = proto_tree_add_protocol_format (tree, proto_fc, tvb, offset,
 851                                              FC_HEADER_SIZE, "Fibre Channel");
 852         fc_tree = proto_item_add_subtree (ti, ett_fc);
 853     }
 854
 855     /* match first exchange with last exchange */
 856     if(fchdr.fctl&FC_FCTL_EXCHANGE_FIRST){
 857         if(!pinfo->fd->flags.visited){
 858             fc_exchange_data fced, *old_fced;
 859
 860             /* first check if we already have seen this exchange and it
 861                is still open/unmatched.
 862             */
 863             fced.oxid=fchdr.oxid;
 864             SET_ADDRESS(&fced.s_id, fchdr.s_id.type, fchdr.s_id.len, fchdr.s_id.data);
 865             SET_ADDRESS(&fced.d_id, fchdr.d_id.type, fchdr.d_id.len, fchdr.d_id.data);
 866             old_fced=g_hash_table_lookup(fc_exchange_unmatched, &fced);
 867             if(old_fced){
 868                 g_hash_table_remove(fc_exchange_unmatched, old_fced);
 869             }
 870             old_fced=g_mem_chunk_alloc(fc_exchange_vals);
 871             old_fced->oxid=fchdr.oxid;
 872             COPY_ADDRESS(&old_fced->s_id, &fchdr.s_id);
 873             COPY_ADDRESS(&old_fced->d_id, &fchdr.d_id);
 874             old_fced->first_exchange_frame=pinfo->fd->num;
 875             old_fced->fc_time.nsecs = pinfo->fd->abs_usecs*1000;
 876             old_fced->fc_time.secs = pinfo->fd->abs_secs;
 877             g_hash_table_insert(fc_exchange_unmatched, old_fced, old_fced);
 878             fc_ex=old_fced;
 879         } else {
 880             fc_exchange_data fced, *old_fced;
 881             fced.oxid=fchdr.oxid;
 882             fced.first_exchange_frame=pinfo->fd->num;
 883             fced.last_exchange_frame=0;
 884             old_fced=g_hash_table_lookup(fc_exchange_matched, &fced);
 885             fc_ex=old_fced;
 886         }
 887     }
 888     if(fchdr.fctl&FC_FCTL_EXCHANGE_LAST){
 889         if(!pinfo->fd->flags.visited){
 890             fc_exchange_data fced, *old_fced;
 891
 892             fced.oxid=fchdr.oxid;
 893             SET_ADDRESS(&fced.s_id, fchdr.d_id.type, fchdr.d_id.len, fchdr.d_id.data);
 894             SET_ADDRESS(&fced.d_id, fchdr.s_id.type, fchdr.s_id.len, fchdr.s_id.data);
 895             old_fced=g_hash_table_lookup(fc_exchange_unmatched, &fced);
 896             if(old_fced){
 897                 g_hash_table_remove(fc_exchange_unmatched, old_fced);
 898                 old_fced->last_exchange_frame=pinfo->fd->num;
 899                 g_hash_table_insert(fc_exchange_matched, old_fced, old_fced);
 900             }
 901             fc_ex=old_fced;
 902         } else {
 903             fc_exchange_data fced, *old_fced;
 904             fced.oxid=fchdr.oxid;
 905             fced.first_exchange_frame=0;
 906             fced.last_exchange_frame=pinfo->fd->num;
 907             old_fced=g_hash_table_lookup(fc_exchange_matched, &fced);
 908             fc_ex=old_fced;
 909         }
 910     }
 911     if(fc_ex){
 912         if(fchdr.fctl&FC_FCTL_EXCHANGE_FIRST){
 913             proto_tree_add_uint(fc_tree, hf_fc_exchange_last_frame, tvb, 0, 0, fc_ex->last_exchange_frame);
 914         }
 915         if(fchdr.fctl&FC_FCTL_EXCHANGE_LAST){
 916             nstime_t delta_time;
 917             proto_tree_add_uint(fc_tree, hf_fc_exchange_first_frame, tvb, 0, 0, fc_ex->first_exchange_frame);
 918             delta_time.secs = pinfo->fd->abs_secs - fc_ex->fc_time.secs;
 919             delta_time.nsecs = pinfo->fd->abs_usecs*1000 - fc_ex->fc_time.nsecs;
 920             if (delta_time.nsecs<0){
 921                 delta_time.nsecs+=1000000000;
 922                 delta_time.secs--;
 923             }
 924             proto_tree_add_time(ti, hf_fc_time, tvb, 0, 0, &delta_time);
 925         }
 926     }
 927     fchdr.fced=fc_ex;
 928
 929     switch (fchdr.r_ctl & 0xF0) {
 930
 931     case FC_RCTL_DEV_DATA:
 932     case FC_RCTL_LINK_DATA:
 933     case FC_RCTL_VIDEO:
 934         /* the lower 4 bits of R_CTL are the information category */
 935         proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 936                                     FC_RCTL_SIZE, fchdr.r_ctl,
 937                                     "R_CTL: 0x%x(%s/%s)",
 938                                     fchdr.r_ctl,
 939                                     val_to_str ((fchdr.r_ctl & 0xF0),
 940                                                 fc_routing_val, "0x%x"),
 941                                     val_to_str ((fchdr.r_ctl & 0x0F),
 942                                                 fc_iu_val, "0x%x"));
 943         break;
 944
 945     case FC_RCTL_LINK_CTL:
 946         /* the lower 4 bits of R_CTL indicate the type of link ctl frame */
 947         proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 948                                     FC_RCTL_SIZE, fchdr.r_ctl,
 949                                     "R_CTL: 0x%x(%s/%s)",
 950                                     fchdr.r_ctl,
 951                                     val_to_str ((fchdr.r_ctl & 0xF0),
 952                                                 fc_routing_val, "0x%x"),
 953                                     val_to_str ((fchdr.r_ctl & 0x0F),
 954                                                 fc_lctl_proto_val, "0x%x"));
 955         break;
 956
 957     case FC_RCTL_BLS:
 958         switch (fchdr.type) {
 959
 960         case 0x00:
 961             /* the lower 4 bits of R_CTL indicate the type of BLS frame */
 962             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 963                                         FC_RCTL_SIZE, fchdr.r_ctl,
 964                                         "R_CTL: 0x%x(%s/%s)",
 965                                         fchdr.r_ctl,
 966                                         val_to_str ((fchdr.r_ctl & 0xF0),
 967                                                     fc_routing_val, "0x%x"),
 968                                         val_to_str ((fchdr.r_ctl & 0x0F),
 969                                                     fc_bls_proto_val, "0x%x"));
 970             break;
 971
 972         default:
 973             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 974                                         FC_RCTL_SIZE, fchdr.r_ctl,
 975                                         "R_CTL: 0x%x(%s/0x%x)",
 976                                         fchdr.r_ctl,
 977                                         val_to_str ((fchdr.r_ctl & 0xF0),
 978                                                     fc_routing_val, "0x%x"),
 979                                         fchdr.r_ctl & 0x0F);
 980             break;
 981         }
 982         break;
 983
 984     case FC_RCTL_ELS:
 985         switch (fchdr.type) {
 986
 987         case 0x01:
 988             /* the lower 4 bits of R_CTL indicate the type of ELS frame */
 989             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 990                                         FC_RCTL_SIZE, fchdr.r_ctl,
 991                                         "R_CTL: 0x%x(%s/%s)",
 992                                         fchdr.r_ctl,
 993                                         val_to_str ((fchdr.r_ctl & 0xF0),
 994                                                     fc_routing_val, "0x%x"),
 995                                         val_to_str ((fchdr.r_ctl & 0x0F),
 996                                                     fc_els_proto_val, "0x%x"));
 997             break;
 998
 999         default:
1000             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
1001                                         FC_RCTL_SIZE, fchdr.r_ctl,
1002                                         "R_CTL: 0x%x(%s/0x%x)",
1003                                         fchdr.r_ctl,
1004                                         val_to_str ((fchdr.r_ctl & 0xF0),
1005                                                     fc_routing_val, "0x%x"),
1006                                         fchdr.r_ctl & 0x0F);
1007             break;
1008         }
1009         break;
1010
1011     default:
1012         proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
1013                                     FC_RCTL_SIZE, fchdr.r_ctl,
1014                                     "R_CTL: 0x%x(%s/0x%x)",
1015                                     fchdr.r_ctl,
1016                                     val_to_str ((fchdr.r_ctl & 0xF0),
1017                                                 fc_routing_val, "0x%x"),
1018                                     fchdr.r_ctl & 0x0F);
1019         break;
1020     }
1021
1022     proto_tree_add_uint_hidden (fc_tree, hf_fc_ftype, tvb, offset, 1,
1023                            ftype);
1024
1025     /* XXX - use "fc_wka_vals[]" on this? */
1026     proto_tree_add_string (fc_tree, hf_fc_did, tvb, offset+1, 3,
1027                            fc_to_str (fchdr.d_id.data));
1028     proto_tree_add_string_hidden (fc_tree, hf_fc_id, tvb, offset+1, 3,
1029                            fc_to_str (fchdr.d_id.data));
1030
1031     proto_tree_add_uint (fc_tree, hf_fc_csctl, tvb, offset+4, 1, fchdr.cs_ctl);
1032
1033     /* XXX - use "fc_wka_vals[]" on this? */
1034     proto_tree_add_string (fc_tree, hf_fc_sid, tvb, offset+5, 3,
1035                            fc_to_str (fchdr.s_id.data));
1036     proto_tree_add_string_hidden (fc_tree, hf_fc_id, tvb, offset+5, 3,
1037                            fc_to_str (fchdr.s_id.data));
1038
1039     if (ftype == FC_FTYPE_LINKCTL) {
1040         if (((fchdr.r_ctl & 0x0F) == FC_LCTL_FBSYB) ||
1041             ((fchdr.r_ctl & 0x0F) == FC_LCTL_FBSYL)) {
1042             /* for F_BSY frames, the upper 4 bits of the type field specify the
1043              * reason for the BSY.
1044              */
1045             proto_tree_add_uint_format (fc_tree, hf_fc_type, tvb,
1046                                         offset+8, FC_TYPE_SIZE,
1047                                         fchdr.type,"Type: 0x%x(%s)", fchdr.type,
1048                                         fclctl_get_typestr (fchdr.r_ctl & 0x0F,
1049                                                             fchdr.type));
1050         } else {
1051             proto_tree_add_item (fc_tree, hf_fc_type, tvb, offset+8, 1, FALSE);
1052         }
1053     } else {
1054         proto_tree_add_item (fc_tree, hf_fc_type, tvb, offset+8, 1, FALSE);
1055     }
1056
1057
1058     dissect_fc_fctl(pinfo, fc_tree, tvb, offset+9, is_ack, fchdr.fctl);
1059
1060
1061     proto_tree_add_item (fc_tree, hf_fc_seqid, tvb, offset+12, 1, FALSE);
1062
1063     df_ctl = tvb_get_guint8(tvb, offset+13);
1064
1065     proto_tree_add_uint (fc_tree, hf_fc_dfctl, tvb, offset+13, 1, df_ctl);
1066     proto_tree_add_uint (fc_tree, hf_fc_seqcnt, tvb, offset+14, 2, fchdr.seqcnt);
1067     proto_tree_add_uint (fc_tree, hf_fc_oxid, tvb, offset+16, 2, fchdr.oxid);
1068     proto_tree_add_uint (fc_tree, hf_fc_rxid, tvb, offset+18, 2, fchdr.rxid);
1069
1070     if (ftype == FC_FTYPE_LINKCTL) {
1071         if (((fchdr.r_ctl & 0x0F) == FC_LCTL_FRJT) ||
1072             ((fchdr.r_ctl & 0x0F) == FC_LCTL_PRJT) ||
1073             ((fchdr.r_ctl & 0x0F) == FC_LCTL_PBSY)) {
1074             /* In all these cases of Link Ctl frame, the parameter field
1075              * encodes the detailed error message
1076              */
1077             proto_tree_add_uint_format (fc_tree, hf_fc_param, tvb,
1078                                         offset+20, 4, param,
1079                                         "Parameter: 0x%x(%s)", param,
1080                                         fclctl_get_paramstr ((fchdr.r_ctl & 0x0F),
1081                                                              param));
1082         } else {
1083             proto_tree_add_item (fc_tree, hf_fc_param, tvb, offset+20, 4, FALSE);
1084         }
1085     } else if (ftype == FC_FTYPE_BLS) {
1086         if ((fchdr.r_ctl & 0x0F) == FC_BLS_ABTS) {
1087             proto_tree_add_uint_format (fc_tree, hf_fc_param, tvb,
1088                                         offset+20, 4, param,
1089                                         "Parameter: 0x%x(%s)", param,
1090                                         ((param & 0x0F) == 1 ? "Abort Sequence" :
1091                                          "Abort Exchange"));
1092         } else {
1093             proto_tree_add_item (fc_tree, hf_fc_param, tvb, offset+20,
1094                                  4, FALSE);
1095         }
1096     } else {
1097         proto_tree_add_item (fc_tree, hf_fc_param, tvb, offset+20, 4, FALSE);
1098     }
1099
1100     /* Skip the Frame_Header */
1101     next_offset = offset + FC_HEADER_SIZE;
1102
1103     /* Network_Header present? */
1104     if (df_ctl & FC_DFCTL_NH) {
1105         /* Yes - dissect it. */
1106         if (tree) {
1107             proto_tree_add_string (fc_tree, hf_fc_nh_da, tvb, next_offset, 8,
1108                                    fcwwn_to_str (tvb_get_ptr (tvb, offset, 8)));
1109             proto_tree_add_string (fc_tree, hf_fc_nh_sa, tvb, offset+8, 8,
1110                                    fcwwn_to_str (tvb_get_ptr (tvb, offset+8, 8)));
1111         }
1112         next_offset += 16;
1113     }
1114
1115     /* XXX - handle Association_Header and Device_Header here */
1116
1117     if (ftype == FC_FTYPE_LINKCTL) {
1118         /* ACK_1 frames and other LINK_CTL frames echo the last seq bit if the
1119          * packet they're ack'ing did not have it set. So, we'll incorrectly
1120          * flag them as being fragmented when they're not. This fixes the
1121          * problem
1122          */
1123         is_lastframe_inseq = TRUE;
1124     } else {
1125         /* XXX is this right?   offset 20, shouldnt it be offset 9? */
1126         is_exchg_resp = ((tvb_get_guint8 (tvb, offset+20) & 0x80) == 0x80);
1127     }
1128
1129     frag_size = tvb_reported_length (tvb)-FC_HEADER_SIZE;
1130
1131     /* If there is an MDS header, we need to subtract the MDS trailer size */
1132     if ((pinfo->ethertype == ETHERTYPE_UNK) || (pinfo->ethertype == ETHERTYPE_FCFT)) {
1133         frag_size -= MDSHDR_TRAILER_SIZE;
1134     } else if (pinfo->ethertype == ETHERTYPE_BRDWALK) {
1135         frag_size -= 8;         /* 4 byte of FC CRC +
1136                                    4 bytes of error+EOF = 8 bytes  */
1137     }
1138
1139     if (!is_lastframe_inseq) {
1140         /* Show this only as a fragmented FC frame */
1141         if (check_col (pinfo->cinfo, COL_INFO)) {
1142             col_append_str (pinfo->cinfo, COL_INFO, " (Fragmented)");
1143         }
1144     }
1145
1146     /* If this is a fragment, attempt to check if fully reassembled frame is
1147      * present, if we're configured to reassemble.
1148      */
1149     if ((ftype != FC_FTYPE_LINKCTL) && (ftype != FC_FTYPE_BLS) &&
1150         (!is_lastframe_inseq || !is_1frame_inseq) && fc_reassemble &&
1151         tvb_bytes_exist(tvb, FC_HEADER_SIZE, frag_size) && tree) {
1152         /* Add this to the list of fragments */
1153
1154         /* In certain cases such as FICON, the SEQ_CNT is streaming
1155          * i.e. continuously increasing. So, zero does not signify the
1156          * first frame of the sequence. To fix this, we need to save the
1157          * SEQ_CNT of the first frame in sequence and use this value to
1158          * determine the actual offset into a frame.
1159          */
1160         conversation = find_conversation (&pinfo->src, &pinfo->dst,
1161                                           pinfo->ptype, pinfo->oxid,
1162                                           pinfo->rxid, NO_PORT2);
1163         if (!conversation) {
1164             conversation = conversation_new (&pinfo->src, &pinfo->dst,
1165                                              pinfo->ptype, pinfo->oxid,
1166                                              pinfo->rxid, NO_PORT2);
1167         }
1168
1169         ckey.conv_idx = conversation->index;
1170
1171         cdata = (fcseq_conv_data_t *)g_hash_table_lookup (fcseq_req_hash,
1172                                                           &ckey);
1173
1174         if (is_1frame_inseq) {
1175             if (cdata) {
1176                 /* Since we never free the memory used by an exchange, this maybe a
1177                  * case of another request using the same exchange as a previous
1178                  * req.
1179                  */
1180                 cdata->seq_cnt = fchdr.seqcnt;
1181             }
1182             else {
1183                 req_key = g_mem_chunk_alloc (fcseq_req_keys);
1184                 req_key->conv_idx = conversation->index;
1185
1186                 cdata = g_mem_chunk_alloc (fcseq_req_vals);
1187                 cdata->seq_cnt = fchdr.seqcnt;
1188
1189                 g_hash_table_insert (fcseq_req_hash, req_key, cdata);
1190             }
1191             real_seqcnt = 0;
1192         }
1193         else if (cdata != NULL) {
1194             real_seqcnt = fchdr.seqcnt - cdata->seq_cnt ;
1195         }
1196         else {
1197             real_seqcnt = fchdr.seqcnt;
1198         }
1199
1200         frag_id = ((pinfo->oxid << 16) ^ seq_id) | is_exchg_resp ;
1201
1202         /* We assume that all frames are of the same max size */
1203         fcfrag_head = fragment_add (tvb, FC_HEADER_SIZE, pinfo, frag_id,
1204                                     fc_fragment_table,
1205                                     real_seqcnt * fc_max_frame_size,
1206                                     frag_size,
1207                                     !is_lastframe_inseq);
1208
1209         if (fcfrag_head) {
1210             next_tvb = tvb_new_real_data (fcfrag_head->data,
1211                                           fcfrag_head->datalen,
1212                                           fcfrag_head->datalen);
1213             tvb_set_child_real_data_tvbuff(tvb, next_tvb);
1214
1215             /* Add the defragmented data to the data source list. */
1216             add_new_data_source(pinfo, next_tvb, "Reassembled FC");
1217
1218             if (tree) {
1219                 proto_tree_add_boolean_hidden (fc_tree, hf_fc_reassembled,
1220                                                tvb, offset+9, 1, 1);
1221             }
1222         }
1223         else {
1224             if (tree) {
1225                 proto_tree_add_boolean_hidden (fc_tree, hf_fc_reassembled,
1226                                                tvb, offset+9, 1, 0);
1227             }
1228             next_tvb = tvb_new_subset (tvb, next_offset, -1, -1);
1229             call_dissector (data_handle, next_tvb, pinfo, tree);
1230             return;
1231         }
1232     } else {
1233         if (tree) {
1234             proto_tree_add_boolean_hidden (fc_tree, hf_fc_reassembled,
1235                                            tvb, offset+9, 1, 0);
1236         }
1237         next_tvb = tvb_new_subset (tvb, next_offset, -1, -1);
1238     }
1239
1240     if ((ftype != FC_FTYPE_LINKCTL) && (ftype != FC_FTYPE_BLS)) {
1241         if (!dissector_try_port (fcftype_dissector_table, ftype, next_tvb,
1242                                  pinfo, tree)) {
1243             call_dissector (data_handle, next_tvb, pinfo, tree);
1244         }
1245     } else if (ftype == FC_FTYPE_BLS) {
1246         if ((fchdr.r_ctl & 0x0F) == FC_BLS_BAACC) {
1247             dissect_fc_ba_acc (next_tvb, pinfo, tree);
1248         } else if ((fchdr.r_ctl & 0x0F) == FC_BLS_BARJT) {
1249             dissect_fc_ba_rjt (next_tvb, pinfo, tree);
1250         }
1251     }
1252
1253     tap_queue_packet(fc_tap, pinfo, &fchdr);
1254 }
1255
1256
1257 /* Register the protocol with Ethereal */
1258
1259 /* this format is require because a script is used to build the C function
1260    that calls all the protocol registration.
1261 */
1262
1263 void
1264 proto_register_fc(void)
1265 {
1266
1267 /* Setup list of header fields  See Section 1.6.1 for details*/
1268     static hf_register_info hf[] = {
1269         { &hf_fc_rctl,
1270           { "R_CTL", "fc.r_ctl", FT_UINT8, BASE_HEX, NULL, 0x0,
1271             "R_CTL", HFILL }},
1272         { &hf_fc_ftype,
1273           {"Frame type", "fc.ftype", FT_UINT8, BASE_HEX, VALS(fc_ftype_vals),
1274            0x0, "Derived Type", HFILL}},
1275         { &hf_fc_did,
1276           { "Dest Addr", "fc.d_id", FT_STRING, BASE_HEX, NULL, 0x0,
1277             "Destination Address", HFILL}},
1278         { &hf_fc_csctl,
1279           {"CS_CTL", "fc.cs_ctl", FT_UINT8, BASE_HEX, NULL, 0x0,
1280            "CS_CTL", HFILL}},
1281         { &hf_fc_sid,
1282           {"Src Addr", "fc.s_id", FT_STRING, BASE_HEX, NULL, 0x0,
1283            "Source Address", HFILL}},
1284         { &hf_fc_id,
1285           {"Addr", "fc.id", FT_STRING, BASE_HEX, NULL, 0x0,
1286            "Source or Destination Address", HFILL}},
1287         { &hf_fc_type,
1288           {"Type", "fc.type", FT_UINT8, BASE_HEX, VALS (fc_fc4_val), 0x0,
1289            "", HFILL}},
1290         { &hf_fc_fctl,
1291           {"F_CTL", "fc.f_ctl", FT_UINT24, BASE_HEX, NULL, 0x0, "", HFILL}},
1292         { &hf_fc_seqid,
1293           {"SEQ_ID", "fc.seq_id", FT_UINT8, BASE_HEX, NULL, 0x0,
1294            "Sequence ID", HFILL}},
1295         { &hf_fc_dfctl,
1296           {"DF_CTL", "fc.df_ctl", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL}},
1297         { &hf_fc_seqcnt,
1298           {"SEQ_CNT", "fc.seq_cnt", FT_UINT16, BASE_DEC, NULL, 0x0,
1299            "Sequence Count", HFILL}},
1300         { &hf_fc_oxid,
1301           {"OX_ID", "fc.ox_id", FT_UINT16, BASE_HEX, NULL, 0x0, "Originator ID",
1302            HFILL}},
1303         { &hf_fc_rxid,
1304           {"RX_ID", "fc.rx_id", FT_UINT16, BASE_HEX, NULL, 0x0, "Receiver ID",
1305            HFILL}},
1306         { &hf_fc_param,
1307           {"Parameter", "fc.parameter", FT_UINT32, BASE_HEX, NULL, 0x0, "Parameter",
1308            HFILL}},
1309
1310         { &hf_fc_reassembled,
1311           {"Reassembled Frame", "fc.reassembled", FT_BOOLEAN, BASE_HEX, NULL,
1312            0x0, "", HFILL}},
1313         { &hf_fc_nh_da,
1314           {"Network DA", "fc.nethdr.da", FT_STRING, BASE_HEX, NULL,
1315            0x0, "", HFILL}},
1316         { &hf_fc_nh_sa,
1317           {"Network SA", "fc.nethdr.sa", FT_STRING, BASE_HEX, NULL,
1318            0x0, "", HFILL}},
1319
1320         /* Basic Link Svc field definitions */
1321         { &hf_fc_bls_seqid_vld,
1322           {"SEQID Valid", "fc.bls_seqidvld", FT_UINT8, BASE_HEX,
1323            VALS (fc_bls_seqid_val), 0x0, "", HFILL}},
1324         { &hf_fc_bls_lastvld_seqid,
1325           {"Last Valid SEQID", "fc.bls_lastseqid", FT_UINT8, BASE_HEX, NULL,
1326            0x0, "", HFILL}},
1327         { &hf_fc_bls_oxid,
1328           {"OXID", "fc.bls_oxid", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL}},
1329         { &hf_fc_bls_rxid,
1330           {"RXID", "fc.bls_rxid", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL}},
1331         { &hf_fc_bls_lowseqcnt,
1332           {"Low SEQCNT", "fc.bls_lseqcnt", FT_UINT16, BASE_HEX, NULL, 0x0, "",
1333            HFILL}},
1334         { &hf_fc_bls_hiseqcnt,
1335           {"High SEQCNT", "fc.bls_hseqcnt", FT_UINT16, BASE_HEX, NULL, 0x0, "",
1336            HFILL}},
1337         { &hf_fc_bls_rjtcode,
1338           {"Reason", "fc.bls_reason", FT_UINT8, BASE_HEX, VALS(fc_bls_barjt_val),
1339            0x0, "", HFILL}},
1340         { &hf_fc_bls_rjtdetail,
1341           {"Reason Explanantion", "fc.bls_rjtdetail", FT_UINT8, BASE_HEX,
1342            VALS (fc_bls_barjt_det_val), 0x0, "", HFILL}},
1343         { &hf_fc_bls_vendor,
1344           {"Vendor Unique Reason", "fc.bls_vnduniq", FT_UINT8, BASE_HEX, NULL,
1345            0x0, "", HFILL}},
1346         { &hf_fc_fctl_exchange_responder,
1347           {"ExgRpd", "fc.fctl.exchange_responder", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_exchange_responder),
1348            FC_FCTL_EXCHANGE_RESPONDER, "Exchange Responder?", HFILL}},
1349         { &hf_fc_fctl_seq_recipient,
1350           {"SeqRec", "fc.fctl.seq_recipient", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_seq_recipient),
1351            FC_FCTL_SEQ_RECIPIENT, "Seq Recipient?", HFILL}},
1352         { &hf_fc_fctl_exchange_first,
1353           {"ExgFst", "fc.fctl.exchange_first", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_exchange_first),
1354            FC_FCTL_EXCHANGE_FIRST, "First Exchange?", HFILL}},
1355         { &hf_fc_fctl_exchange_last,
1356           {"ExgLst", "fc.fctl.exchange_last", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_exchange_last),
1357            FC_FCTL_EXCHANGE_LAST, "Last Exchange?", HFILL}},
1358         { &hf_fc_fctl_seq_last,
1359           {"SeqLst", "fc.fctl.seq_last", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_seq_last),
1360            FC_FCTL_SEQ_LAST, "Last Sequence?", HFILL}},
1361         { &hf_fc_fctl_priority,
1362           {"Pri", "fc.fctl.priority", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_priority),
1363            FC_FCTL_PRIORITY, "Priority", HFILL}},
1364         { &hf_fc_fctl_transfer_seq_initiative,
1365           {"TSI", "fc.fctl.transfer_seq_initiative", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_transfer_seq_initiative),
1366            FC_FCTL_TRANSFER_SEQ_INITIATIVE, "Transfer Seq Initiative", HFILL}},
1367         { &hf_fc_fctl_rexmitted_seq,
1368           {"RetSeq", "fc.fctl.rexmitted_seq", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_rexmitted_seq),
1369            FC_FCTL_REXMITTED_SEQ, "Retransmitted Sequence", HFILL}},
1370         { &hf_fc_fctl_rel_offset,
1371           {"RelOff", "fc.fctl.rel_offset", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_rel_offset),
1372            FC_FCTL_REL_OFFSET, "rel offset", HFILL}},
1373         { &hf_fc_fctl_last_data_frame,
1374           {"LDF", "fc.fctl.last_data_frame", FT_UINT24, BASE_HEX, VALS(last_data_frame_vals),
1375            FC_FCTL_LAST_DATA_FRAME_MASK, "Last Data Frame?", HFILL}},
1376         { &hf_fc_fctl_ack_0_1,
1377           {"A01", "fc.fctl.ack_0_1", FT_UINT24, BASE_HEX, VALS(ack_0_1_vals),
1378            FC_FCTL_ACK_0_1_MASK, "Ack 0/1 value", HFILL}},
1379         { &hf_fc_fctl_abts_ack,
1380           {"AA", "fc.fctl.abts_ack", FT_UINT24, BASE_HEX, VALS(abts_ack_vals),
1381            FC_FCTL_ABTS_MASK, "ABTS ACK values", HFILL}},
1382         { &hf_fc_fctl_abts_not_ack,
1383           {"AnA", "fc.fctl.abts_not_ack", FT_UINT24, BASE_HEX, VALS(abts_not_ack_vals),
1384            FC_FCTL_ABTS_MASK, "ABTS not ACK vals", HFILL}},
1385         { &hf_fc_exchange_first_frame,
1386           { "Exchange First In", "fc.exchange_first_frame", FT_FRAMENUM, BASE_NONE, NULL,
1387            0, "The first frame of this exchange is in this frame", HFILL }},
1388         { &hf_fc_exchange_last_frame,
1389           { "Exchange Last In", "fc.exchange_last_frame", FT_FRAMENUM, BASE_NONE, NULL,
1390            0, "The last frame of this exchange is in this frame", HFILL }},
1391         { &hf_fc_time,
1392           { "Time from Exchange First", "fc.time", FT_RELATIVE_TIME, BASE_NONE, NULL,
1393            0, "Time since the first frame of the Exchange", HFILL }},
1394     };
1395
1396     /* Setup protocol subtree array */
1397     static gint *ett[] = {
1398         &ett_fc,
1399         &ett_fcbls,
1400         &ett_fctl
1401     };
1402
1403     module_t *fc_module;
1404
1405     /* Register the protocol name and description */
1406     proto_fc = proto_register_protocol ("Fibre Channel", "FC", "fc");
1407     register_dissector ("fc", dissect_fc, proto_fc);
1408     fc_tap = register_tap("fc");
1409
1410     /* Required function calls to register the header fields and subtrees used */
1411     proto_register_field_array(proto_fc, hf, array_length(hf));
1412     proto_register_subtree_array(ett, array_length(ett));
1413
1414     fcftype_dissector_table = register_dissector_table ("fc.ftype",
1415                                                         "FC Frame Type",
1416                                                         FT_UINT8, BASE_HEX);
1417
1418     /* Register preferences */
1419     fc_module = prefs_register_protocol (proto_fc, NULL);
1420     prefs_register_bool_preference (fc_module,
1421                                     "reassemble",
1422                                     "Reassemble multi-frame sequences",
1423                                     "If enabled, reassembly of multi-frame "
1424                                     "sequences is done",
1425                                     &fc_reassemble);
1426     prefs_register_uint_preference (fc_module,
1427                                     "max_frame_size", "Max FC Frame Size",
1428                                     "This is the size of non-last frames in a "
1429                                     "multi-frame sequence", 10,
1430                                     &fc_max_frame_size);
1431
1432     register_init_routine(fc_defragment_init);
1433     register_init_routine (fc_exchange_init_protocol);
1434 }
1435
1436
1437 /* If this dissector uses sub-dissector registration add a registration routine.
1438    This format is required because a script is used to find these routines and
1439    create the code that calls these routines.
1440 */
1441 void
1442 proto_reg_handoff_fc (void)
1443 {
1444     data_handle = find_dissector("data");
1445 }