epan/dissectors/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  * $Id$
   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 #include <epan/packet.h>
  48 #include <epan/prefs.h>
  49 #include <epan/reassemble.h>
  50 #include <epan/conversation.h>
  51 #include "etypes.h"
  52 #include "packet-fc.h"
  53 #include "packet-fclctl.h"
  54 #include "packet-fcbls.h"
  55 #include <epan/tap.h>
  56 #include <epan/emem.h>
  57
  58 #define FC_HEADER_SIZE         24
  59 #define FC_RCTL_EISL           0x50
  60 #define MDSHDR_TRAILER_SIZE    6
  61
  62 /* Size of various fields in FC header in bytes */
  63 #define FC_RCTL_SIZE           1
  64 #define FC_DID_SIZE            3
  65 #define FC_CSCTL_SIZE          1
  66 #define FC_SID_SIZE            3
  67 #define FC_TYPE_SIZE           1
  68 #define FC_FCTL_SIZE           3
  69 #define FC_SEQID_SIZE          1
  70 #define FC_DFCTL_SIZE          1
  71 #define FC_SEQCNT_SIZE         2
  72 #define FC_OXID_SIZE           2
  73 #define FC_RXID_SIZE           2
  74 #define FC_PARAM_SIZE          4
  75
  76 /* Initialize the protocol and registered fields */
  77 static int proto_fc = -1;
  78 static int hf_fc_time = -1;
  79 static int hf_fc_exchange_first_frame = -1;
  80 static int hf_fc_exchange_last_frame = -1;
  81 static int hf_fc_rctl = -1;
  82 static int hf_fc_did = -1;
  83 static int hf_fc_csctl = -1;
  84 static int hf_fc_sid = -1;
  85 static int hf_fc_id = -1;
  86 static int hf_fc_type = -1;
  87 static int hf_fc_fctl = -1;
  88 static int hf_fc_fctl_exchange_responder = -1;
  89 static int hf_fc_fctl_seq_recipient = -1;
  90 static int hf_fc_fctl_exchange_first = -1;
  91 static int hf_fc_fctl_exchange_last = -1;
  92 static int hf_fc_fctl_seq_last = -1;
  93 static int hf_fc_fctl_priority = -1;
  94 static int hf_fc_fctl_transfer_seq_initiative = -1;
  95 static int hf_fc_fctl_rexmitted_seq = -1;
  96 static int hf_fc_fctl_rel_offset = -1;
  97 static int hf_fc_fctl_abts_ack = -1;
  98 static int hf_fc_fctl_abts_not_ack = -1;
  99 static int hf_fc_fctl_last_data_frame = -1;
 100 static int hf_fc_fctl_ack_0_1 = -1;
 101 static int hf_fc_seqid = -1;
 102 static int hf_fc_dfctl = -1;
 103 static int hf_fc_seqcnt = -1;
 104 static int hf_fc_oxid = -1;
 105 static int hf_fc_rxid = -1;
 106 static int hf_fc_param = -1;
 107 static int hf_fc_ftype = -1;    /* Derived field, non-existent in FC hdr */
 108 static int hf_fc_reassembled = -1;
 109 static int hf_fc_eisl = -1;
 110
 111 /* Network_Header fields */
 112 static int hf_fc_nh_da = -1;
 113 static int hf_fc_nh_sa = -1;
 114
 115 /* For Basic Link Svc */
 116 static int hf_fc_bls_seqid_vld = -1;
 117 static int hf_fc_bls_lastvld_seqid = -1;
 118 static int hf_fc_bls_oxid = -1;
 119 static int hf_fc_bls_rxid = -1;
 120 static int hf_fc_bls_lowseqcnt = -1;
 121 static int hf_fc_bls_hiseqcnt = -1;
 122 static int hf_fc_bls_rjtcode = -1;
 123 static int hf_fc_bls_rjtdetail = -1;
 124 static int hf_fc_bls_vendor = -1;
 125
 126
 127 /* Initialize the subtree pointers */
 128 static gint ett_fc = -1;
 129 static gint ett_fctl = -1;
 130 static gint ett_fcbls = -1;
 131
 132 static dissector_table_t fcftype_dissector_table;
 133 static dissector_handle_t data_handle;
 134
 135 static int fc_tap = -1;
 136
 137 /* Reassembly stuff */
 138 static gboolean fc_reassemble = TRUE;
 139 static guint32  fc_max_frame_size = 1024;
 140 static GHashTable *fc_fragment_table = NULL;
 141
 142 typedef struct _fcseq_conv_key {
 143     guint32 conv_idx;
 144 } fcseq_conv_key_t;
 145
 146 typedef struct _fcseq_conv_data {
 147     guint32 seq_cnt;
 148 } fcseq_conv_data_t;
 149
 150 GHashTable *fcseq_req_hash = NULL;
 151
 152 static GHashTable *fc_exchange_unmatched = NULL;
 153 static GHashTable *fc_exchange_matched = NULL;
 154
 155 /*
 156  * Hash Functions
 157  */
 158 static gint
 159 fcseq_equal(gconstpointer v, gconstpointer w)
 160 {
 161   const fcseq_conv_key_t *v1 = v;
 162   const fcseq_conv_key_t *v2 = w;
 163
 164   return (v1->conv_idx == v2->conv_idx);
 165 }
 166
 167 static guint
 168 fcseq_hash (gconstpointer v)
 169 {
 170     const fcseq_conv_key_t *key = v;
 171     guint val;
 172
 173     val = key->conv_idx;
 174
 175     return val;
 176 }
 177
 178 static guint
 179 fc_exchange_hash_unmatched(gconstpointer v)
 180 {
 181     const fc_exchange_data *fced=(const fc_exchange_data *)v;
 182
 183     return fced->oxid;
 184 }
 185 static gint
 186 fc_exchange_equal_unmatched(gconstpointer v1, gconstpointer v2)
 187 {
 188     const fc_exchange_data *fced1=(const fc_exchange_data *)v1;
 189     const fc_exchange_data *fced2=(const fc_exchange_data *)v2;
 190
 191     /* oxid must match */
 192     if(fced1->oxid!=fced2->oxid){
 193         return 0;
 194     }
 195     /* compare s_id, d_id and treat the fc address
 196        s_id==00.00.00 as a wildcard matching anything */
 197     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) ){
 198         return 0;
 199     }
 200     if(CMP_ADDRESS(&fced1->d_id, &fced2->d_id)){
 201         return 0;
 202     }
 203
 204     return 1;
 205 }
 206
 207 static guint
 208 fc_exchange_hash_matched(gconstpointer v)
 209 {
 210     const fc_exchange_data *fced=(const fc_exchange_data *)v;
 211
 212     return fced->oxid;
 213 }
 214 static gint
 215 fc_exchange_equal_matched(gconstpointer v1, gconstpointer v2)
 216 {
 217     const fc_exchange_data *fced1=(const fc_exchange_data *)v1;
 218     const fc_exchange_data *fced2=(const fc_exchange_data *)v2;
 219     guint32 fef1, fef2, lef1, lef2;
 220
 221     /* oxid must match */
 222     if(fced1->oxid!=fced2->oxid){
 223         return 0;
 224     }
 225     fef1=fced1->first_exchange_frame;
 226     fef2=fced2->first_exchange_frame;
 227     lef1=fced1->last_exchange_frame;
 228     lef2=fced2->last_exchange_frame;
 229     if(!fef1)fef1=fef2;
 230     if(!fef2)fef2=fef1;
 231     if(!lef1)lef1=lef2;
 232     if(!lef2)lef2=lef1;
 233
 234     if(fef1!=fef2){
 235         return 0;
 236     }
 237     if(lef1!=lef2){
 238         return 0;
 239     }
 240
 241     return 1;
 242 }
 243
 244 static void
 245 fc_exchange_init_protocol(void)
 246 {
 247     if(fc_exchange_unmatched){
 248         g_hash_table_destroy(fc_exchange_unmatched);
 249         fc_exchange_unmatched=NULL;
 250     }
 251     if(fc_exchange_matched){
 252         g_hash_table_destroy(fc_exchange_matched);
 253         fc_exchange_matched=NULL;
 254     }
 255
 256     fc_exchange_unmatched=g_hash_table_new(fc_exchange_hash_unmatched, fc_exchange_equal_unmatched);
 257     fc_exchange_matched=g_hash_table_new(fc_exchange_hash_matched, fc_exchange_equal_matched);
 258
 259     fragment_table_init(&fc_fragment_table);
 260
 261     if (fcseq_req_hash)
 262         g_hash_table_destroy(fcseq_req_hash);
 263
 264     fcseq_req_hash = g_hash_table_new(fcseq_hash, fcseq_equal);
 265 }
 266
 267
 268 const value_string fc_fc4_val[] = {
 269     {FC_TYPE_ELS,        "Ext Link Svc"},
 270     {FC_TYPE_LLCSNAP,    "LLC_SNAP"},
 271     {FC_TYPE_IP,         "IP/FC"},
 272     {FC_TYPE_SCSI,       "FCP"},
 273     {FC_TYPE_FCCT,       "FC_CT"},
 274     {FC_TYPE_SWILS,      "SW_ILS"},
 275     {FC_TYPE_AL,         "AL"},
 276     {FC_TYPE_SNMP,       "SNMP"},
 277     {FC_TYPE_SB_FROM_CU, "SB-3(CU->Channel)"},
 278     {FC_TYPE_SB_TO_CU,   "SB-3(Channel->CU)"},
 279     {0, NULL},
 280 };
 281
 282 static const value_string fc_ftype_vals [] = {
 283     {FC_FTYPE_UNDEF ,    "Unknown frame"},
 284     {FC_FTYPE_SWILS,     "SW_ILS"},
 285     {FC_FTYPE_IP ,       "IP/FC"},
 286     {FC_FTYPE_SCSI ,     "FCP"},
 287     {FC_FTYPE_BLS ,      "Basic Link Svc"},
 288     {FC_FTYPE_ELS ,      "ELS"},
 289     {FC_FTYPE_FCCT ,     "FC_CT"},
 290     {FC_FTYPE_LINKDATA,  "Link Data"},
 291     {FC_FTYPE_VDO,       "Video Data"},
 292     {FC_FTYPE_LINKCTL,   "Link Ctl"},
 293     {FC_FTYPE_SBCCS,     "SBCCS"},
 294     {0, NULL},
 295 };
 296
 297 static const value_string fc_wka_vals[] = {
 298     {FC_WKA_MULTICAST,    "Multicast Server"},
 299     {FC_WKA_CLKSYNC,      "Clock Sync Server"},
 300     {FC_WKA_KEYDIST,      "Key Distribution Server"},
 301     {FC_WKA_ALIAS,        "Alias Server"},
 302     {FC_WKA_QOSF,         "QoS Facilitator"},
 303     {FC_WKA_MGMT,         "Management Server"},
 304     {FC_WKA_TIME,         "Time Server"},
 305     {FC_WKA_DNS,          "Directory Server"},
 306     {FC_WKA_FABRIC_CTRLR, "Fabric Ctlr"},
 307     {FC_WKA_FPORT,        "F_Port Server"},
 308     {FC_WKA_BCAST,        "Broadcast ID"},
 309     {0, NULL},
 310 };
 311
 312 static const value_string fc_routing_val[] = {
 313     {FC_RCTL_DEV_DATA,  "Device_Data"},
 314     {FC_RCTL_ELS,       "Extended Link Services"},
 315     {FC_RCTL_LINK_DATA, "FC-4 Link_Data"},
 316     {FC_RCTL_VIDEO,     "Video_Data"},
 317     {FC_RCTL_BLS,       "Basic Link Services"},
 318     {FC_RCTL_LINK_CTL,  "Link_Control Frame"},
 319     {0, NULL},
 320 };
 321
 322 static const value_string fc_iu_val[] = {
 323     {FC_IU_UNCATEGORIZED   , "Uncategorized Data"},
 324     {FC_IU_SOLICITED_DATA  , "Solicited Data"},
 325     {FC_IU_UNSOLICITED_CTL , "Unsolicited Control"},
 326     {FC_IU_SOLICITED_CTL   , "Solicited Control"},
 327     {FC_IU_UNSOLICITED_DATA, "Solicited Data"},
 328     {FC_IU_DATA_DESCRIPTOR , "Data Descriptor"},
 329     {FC_IU_UNSOLICITED_CMD , "Unsolicited Command"},
 330     {FC_IU_CMD_STATUS      , "Command Status"},
 331     {0, NULL},
 332 };
 333
 334
 335 static void fc_defragment_init(void)
 336 {
 337   fragment_table_init (&fc_fragment_table);
 338 }
 339
 340
 341 static gchar *
 342 fctl_to_str (const guint8 *fctl, gchar *str, gboolean is_ack)
 343 {
 344     int stroff = 0;
 345     guint8 tmp = 0;
 346
 347     if (str == NULL)
 348         return (str);
 349
 350     if (fctl[2] & 0x80) {
 351         strcpy (str, "Exchange Responder, ");
 352         stroff += 20;
 353     }
 354     else {
 355         strcpy (str, "Exchange Originator, ");
 356         stroff += 21;
 357     }
 358
 359     if (fctl[2] & 0x40) {
 360         strcpy (&str[stroff], "Seq Recipient, ");
 361         stroff += 15;
 362     }
 363     else {
 364         strcpy (&str[stroff], "Seq Initiator, ");
 365         stroff += 15;
 366     }
 367
 368     if (fctl[2] & 0x20) {
 369         strcpy (&str[stroff], "Exchg First, ");
 370         stroff += 13;
 371     }
 372
 373     if (fctl[2] & 0x10) {
 374         strcpy (&str[stroff], "Exchg Last, ");
 375         stroff += 12;
 376     }
 377
 378     if (fctl[2] & 0x8) {
 379         strcpy (&str[stroff], "Seq Last, ");
 380         stroff += 10;
 381     }
 382
 383     if (fctl[2] & 0x2) {
 384         strcpy (&str[stroff], "Priority, ");
 385         stroff += 10;
 386     }
 387     else {
 388         strcpy (&str[stroff], "CS_CTL, ");
 389         stroff += 8;
 390     }
 391
 392     if (fctl[2] & 0x1) {
 393         strcpy (&str[stroff], "Transfer Seq Initiative, ");
 394         stroff += 25;
 395     }
 396
 397     if (fctl[1] & 0x30) {
 398         strcpy (&str[stroff], "ACK_0 Reqd, ");
 399         stroff += 12;
 400     }
 401     else if (fctl[1] & 0x10) {
 402         strcpy (&str[stroff], "ACK_1 Reqd, ");
 403         stroff += 12;
 404     }
 405
 406     if (fctl[1] & 0x2) {
 407         strcpy (&str[stroff], "Rexmitted Seq, ");
 408         stroff += 15;
 409     }
 410
 411     tmp = fctl[0] & 0xC0;
 412     switch (tmp) {
 413     case 0:
 414         strcpy (&str[stroff], "Last Data Frame - No Info, ");
 415         stroff += 27;
 416         break;
 417     case 1:
 418         strcpy (&str[stroff], "Last Data Frame - Seq Imm, ");
 419         stroff += 27;
 420         break;
 421     case 2:
 422         strcpy (&str[stroff], "Last Data Frame - Seq Soon, ");
 423         stroff += 28;
 424         break;
 425     case 3:
 426         strcpy (&str[stroff], "Last Data Frame - Seq Delyd, ");
 427         stroff += 29;
 428         break;
 429     }
 430
 431     tmp = fctl[0] & 0x30;
 432     switch (tmp) {
 433     case 0:
 434         if (is_ack) {
 435             strcpy (&str[stroff], "ABTS - Cont, ");
 436             stroff += 13;
 437         }
 438         else {
 439             strcpy (&str[stroff], "ABTS - Abort/MS, ");
 440             stroff += 17;
 441         }
 442         break;
 443     case 0x10:
 444         if (is_ack) {
 445             strcpy (&str[stroff], "ABTS - AbortABTS - Abort, ");
 446             stroff += 14;
 447         }
 448         else {
 449             strcpy (&str[stroff], "ABTS - Abort/SS, ");
 450             stroff += 17;
 451         }
 452         break;
 453     case 0x20:
 454         if (is_ack) {
 455             strcpy (&str[stroff], "ABTS - Stop, ");
 456             stroff += 13;
 457         }
 458         else {
 459             strcpy (&str[stroff], "ABTS - Process/IB, ");
 460             stroff += 19;
 461         }
 462         break;
 463     case 0x30:
 464         if (is_ack) {
 465             strcpy (&str[stroff], "ABTS - Imm Seq Retx, ");
 466             stroff += 21;
 467         }
 468         else {
 469             strcpy (&str[stroff], "ABTS - Discard/MS/Imm Retx, ");
 470             stroff += 28;
 471         }
 472         break;
 473     }
 474
 475     if (fctl[0] & 0x8) {
 476         strcpy (&str[stroff], "Rel Offset = 1");
 477         stroff += 14;
 478     }
 479
 480     return (str);
 481 }
 482
 483 /* BA_ACC & BA_RJT are decoded in this file itself instead of a traditional
 484  * dedicated file and dissector format because the dissector would require some
 485  * fields of the FC_HDR such as param in some cases, type in some others, the
 486  * lower 4 bits of r_ctl in some other cases etc. So, we decode BLS & Link Ctl
 487  * in this file itself.
 488  */
 489 static void
 490 dissect_fc_ba_acc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 491 {
 492     /* Set up structures needed to add the protocol subtree and manage it */
 493     proto_item *ti;
 494     proto_tree *acc_tree;
 495     int offset = 0;
 496
 497     /* Make entries in Protocol column and Info column on summary display */
 498     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 499         col_set_str(pinfo->cinfo, COL_PROTOCOL, "BLS");
 500
 501     if (check_col(pinfo->cinfo, COL_INFO))
 502         col_set_str(pinfo->cinfo, COL_INFO, "BA_ACC");
 503
 504     if (tree) {
 505         ti = proto_tree_add_text (tree, tvb, 0, tvb_length (tvb), "Basic Link Svc");
 506         acc_tree = proto_item_add_subtree (ti, ett_fcbls);
 507
 508         proto_tree_add_item (acc_tree, hf_fc_bls_seqid_vld, tvb, offset++, 1, FALSE);
 509         proto_tree_add_item (acc_tree, hf_fc_bls_lastvld_seqid, tvb, offset++, 1, FALSE);
 510         offset += 2; /* Skip reserved field */
 511         proto_tree_add_item (acc_tree, hf_fc_bls_oxid, tvb, offset, 2, FALSE);
 512         offset += 2;
 513         proto_tree_add_item (acc_tree, hf_fc_bls_rxid, tvb, offset, 2, FALSE);
 514         offset += 2;
 515         proto_tree_add_item (acc_tree, hf_fc_bls_lowseqcnt, tvb, offset, 2, FALSE);
 516         offset += 2;
 517         proto_tree_add_item (acc_tree, hf_fc_bls_hiseqcnt, tvb, offset, 2, FALSE);
 518     }
 519 }
 520
 521 static void
 522 dissect_fc_ba_rjt (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 523 {
 524     /* Set up structures needed to add the protocol subtree and manage it */
 525     proto_item *ti;
 526     proto_tree *rjt_tree;
 527     int offset = 0;
 528
 529     /* Make entries in Protocol column and Info column on summary display */
 530     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 531         col_set_str(pinfo->cinfo, COL_PROTOCOL, "BLS");
 532
 533     if (check_col(pinfo->cinfo, COL_INFO))
 534         col_set_str(pinfo->cinfo, COL_INFO, "BA_RJT");
 535
 536     if (tree) {
 537         ti = proto_tree_add_text (tree, tvb, 0, tvb_length (tvb), "Basic Link Svc");
 538         rjt_tree = proto_item_add_subtree (ti, ett_fcbls);
 539
 540         proto_tree_add_item (rjt_tree, hf_fc_bls_rjtcode, tvb, offset+1, 1, FALSE);
 541         proto_tree_add_item (rjt_tree, hf_fc_bls_rjtdetail, tvb, offset+2, 1, FALSE);
 542         proto_tree_add_item (rjt_tree, hf_fc_bls_vendor, tvb, offset+3, 1, FALSE);
 543     }
 544 }
 545
 546 static guint8
 547 fc_get_ftype (guint8 r_ctl, guint8 type)
 548 {
 549     /* A simple attempt to determine the upper level protocol based on the
 550      * r_ctl & type fields.
 551      */
 552     switch (r_ctl & 0xF0) {
 553     case FC_RCTL_DEV_DATA:
 554         switch (type) {
 555         case FC_TYPE_SWILS:
 556             if ((r_ctl == 0x2) || (r_ctl == 0x3))
 557                 return FC_FTYPE_SWILS;
 558             else
 559                 return FC_FTYPE_UNDEF;
 560         case FC_TYPE_IP:
 561             return FC_FTYPE_IP;
 562         case FC_TYPE_SCSI:
 563             return FC_FTYPE_SCSI;
 564         case FC_TYPE_FCCT:
 565             return FC_FTYPE_FCCT;
 566         case FC_TYPE_SB_FROM_CU:
 567         case FC_TYPE_SB_TO_CU:
 568             return FC_FTYPE_SBCCS;
 569         default:
 570             return FC_FTYPE_UNDEF;
 571         }
 572     case FC_RCTL_ELS:
 573         if (((r_ctl & 0x0F) == 0x2) || ((r_ctl & 0x0F) == 0x3))
 574             return FC_FTYPE_ELS;
 575         else
 576             return FC_FTYPE_UNDEF;
 577     case FC_RCTL_LINK_DATA:
 578         return FC_FTYPE_LINKDATA;
 579     case FC_RCTL_VIDEO:
 580         return FC_FTYPE_VDO;
 581     case FC_RCTL_BLS:
 582         if (type == 0)
 583             return FC_FTYPE_BLS;
 584         else
 585             return FC_FTYPE_UNDEF;
 586     case FC_RCTL_LINK_CTL:
 587         return FC_FTYPE_LINKCTL;
 588     default:
 589         return FC_FTYPE_UNDEF;
 590     }
 591 }
 592
 593 static const value_string abts_ack_vals[] = {
 594         {0x000000,      "ABTS - Cont"},
 595         {0x000010,      "ABTS - Abort"},
 596         {0x000020,      "ABTS - Stop"},
 597         {0x000030,      "ABTS - Imm Seq Retx"},
 598         {0,NULL}
 599 };
 600 static const value_string abts_not_ack_vals[] = {
 601         {0x000000,      "ABTS - Abort/MS"},
 602         {0x000010,      "ABTS - Abort/SS"},
 603         {0x000020,      "ABTS - Process/IB"},
 604         {0x000030,      "ABTS - Discard/MS/Imm Retx"},
 605         {0,NULL}
 606 };
 607 static const value_string last_data_frame_vals[] = {
 608         {0x000000,      "Last Data Frame - No Info"},
 609         {0x004000,      "Last Data Frame - Seq Imm"},
 610         {0x008000,      "Last Data Frame - Seq Soon"},
 611         {0x00c000,      "Last Data Frame - Seq Delyd"},
 612         {0,NULL}
 613 };
 614 static const value_string ack_0_1_vals[] = {
 615         {0x003000,      "ACK_0 Required"},
 616         {0x002000,      "ACK_0 Required"},
 617         {0x001000,      "ACK_1 Required"},
 618         {0x000000,      "no ack required"},
 619         {0,NULL}
 620 };
 621 static const true_false_string tfs_fc_fctl_exchange_responder = {
 622         "Exchange Responder",
 623         "Exchange Originator"
 624 };
 625 static const true_false_string tfs_fc_fctl_seq_recipient = {
 626         "Seq Recipient",
 627         "Seq Initiator"
 628 };
 629 static const true_false_string tfs_fc_fctl_exchange_first = {
 630         "Exchg First",
 631         "NOT exchg first"
 632 };
 633 static const true_false_string tfs_fc_fctl_exchange_last = {
 634         "Exchg Last",
 635         "NOT exchg last"
 636 };
 637 static const true_false_string tfs_fc_fctl_seq_last = {
 638         "Seq Last",
 639         "NOT seq last"
 640 };
 641 static const true_false_string tfs_fc_fctl_priority = {
 642         "Priority",
 643         "CS_CTL"
 644 };
 645 static const true_false_string tfs_fc_fctl_transfer_seq_initiative = {
 646         "Transfer Seq Initiative",
 647         "NOT transfer seq initiative"
 648 };
 649 static const true_false_string tfs_fc_fctl_rexmitted_seq = {
 650         "Retransmitted Sequence",
 651         "NOT retransmitted sequence"
 652 };
 653 static const true_false_string tfs_fc_fctl_rel_offset = {
 654         "Rel Offset SET",
 655         "rel offset NOT set"
 656 };
 657
 658
 659
 660
 661 /* code to dissect the  F_CTL bitmask */
 662 static void
 663 dissect_fc_fctl(packet_info *pinfo _U_, proto_tree *parent_tree, tvbuff_t *tvb, int offset, gboolean is_ack, guint32 fctl)
 664 {
 665         proto_item *item;
 666         proto_tree *tree;
 667         gchar str[256];
 668
 669         item=proto_tree_add_uint(parent_tree, hf_fc_fctl, tvb, offset, 3, fctl);
 670         tree=proto_item_add_subtree(item, ett_fctl);
 671
 672
 673         proto_tree_add_boolean(tree, hf_fc_fctl_exchange_responder, tvb, offset, 3, fctl);
 674
 675         proto_tree_add_boolean(tree, hf_fc_fctl_seq_recipient, tvb, offset, 3, fctl);
 676
 677         proto_tree_add_boolean(tree, hf_fc_fctl_exchange_first, tvb, offset, 3, fctl);
 678
 679         proto_tree_add_boolean(tree, hf_fc_fctl_exchange_last, tvb, offset, 3, fctl);
 680
 681         proto_tree_add_boolean(tree, hf_fc_fctl_seq_last, tvb, offset, 3, fctl);
 682
 683         proto_tree_add_boolean(tree, hf_fc_fctl_priority, tvb, offset, 3, fctl);
 684
 685         proto_tree_add_boolean(tree, hf_fc_fctl_transfer_seq_initiative, tvb, offset, 3, fctl);
 686
 687         proto_tree_add_uint(tree, hf_fc_fctl_last_data_frame, tvb, offset, 3, fctl);
 688
 689         proto_tree_add_uint(tree, hf_fc_fctl_ack_0_1, tvb, offset, 3, fctl);
 690
 691
 692         proto_tree_add_boolean(tree, hf_fc_fctl_rexmitted_seq, tvb, offset, 3, fctl);
 693
 694         if(is_ack){
 695                 proto_tree_add_uint(tree, hf_fc_fctl_abts_ack, tvb, offset, 3, fctl);
 696         } else {
 697                 proto_tree_add_uint(tree, hf_fc_fctl_abts_ack, tvb, offset, 3, fctl);
 698         }
 699
 700         proto_tree_add_boolean(tree, hf_fc_fctl_rel_offset, tvb, offset, 3, fctl);
 701
 702         fctl_to_str( ((guint8 *)&fctl), str, is_ack);
 703         proto_item_append_text(item, "  %s", str);
 704 }
 705
 706 static const value_string fc_bls_proto_val[] = {
 707     {FC_BLS_NOP    , "NOP"},
 708     {FC_BLS_ABTS   , "ABTS"},
 709     {FC_BLS_RMC    , "RMC"},
 710     {FC_BLS_BAACC  , "BA_ACC"},
 711     {FC_BLS_BARJT  , "BA_RJT"},
 712     {FC_BLS_PRMT   , "PRMT"},
 713     {0, NULL},
 714 };
 715
 716 static const value_string fc_els_proto_val[] = {
 717     {0x01    , "Solicited Data"},
 718     {0x02    , "Request"},
 719     {0x03    , "Reply"},
 720     {0, NULL},
 721 };
 722
 723 /* Code to actually dissect the packets */
 724 static void
 725 dissect_fc_helper (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gboolean is_ifcp)
 726 {
 727    /* Set up structures needed to add the protocol subtree and manage it */
 728     proto_item *ti=NULL;
 729     proto_tree *fc_tree = NULL;
 730     tvbuff_t *next_tvb;
 731     int offset = 0, next_offset, eisl_offset = -1;
 732     gboolean is_lastframe_inseq, is_1frame_inseq, is_valid_frame;
 733     gboolean is_exchg_resp = 0;
 734     fragment_data *fcfrag_head;
 735     guint32 frag_id;
 736     guint32 frag_size;
 737     guint8 df_ctl, seq_id;
 738
 739     guint32 param;
 740     guint16 real_seqcnt;
 741     guint8 ftype;
 742     gboolean is_ack;
 743
 744     static fc_hdr fchdr;
 745     fc_exchange_data *fc_ex=NULL;
 746
 747     conversation_t *conversation;
 748     fcseq_conv_data_t *cdata;
 749     fcseq_conv_key_t ckey, *req_key;
 750
 751     fchdr.fced=NULL;
 752
 753     /* Make entries in Protocol column and Info column on summary display */
 754     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 755         col_set_str(pinfo->cinfo, COL_PROTOCOL, "FC");
 756
 757     fchdr.r_ctl = tvb_get_guint8 (tvb, offset);
 758
 759     /* If the R_CTL is the EISL field, skip the first 8 bytes to retrieve the
 760      * real FC header. EISL is Cisco-proprietary and is not decoded.
 761      */
 762     if (fchdr.r_ctl == FC_RCTL_EISL) {
 763         eisl_offset = offset;
 764         offset += 8;
 765         fchdr.r_ctl = tvb_get_guint8 (tvb, offset);
 766     }
 767
 768     /* Each fc endpoint pair gets its own TCP session in iFCP but
 769      * the src/dst ids are undefined(==semi-random) in the FC header.
 770      * This means we can no track conversations for FC over iFCP by using
 771      * the FC src/dst addresses.
 772      * For iFCP: Do not update the pinfo src/dst struct and let it remain
 773      * being tcpip src/dst so that request/response matching in the FCP layer
 774      * will use ip addresses instead and still work.
 775      */
 776     if(!is_ifcp){
 777         SET_ADDRESS (&pinfo->dst, AT_FC, 3, tvb_get_ptr(tvb,offset+1,3));
 778         SET_ADDRESS (&pinfo->src, AT_FC, 3, tvb_get_ptr(tvb,offset+5,3));
 779         pinfo->srcport=0;
 780         pinfo->destport=0;
 781     }
 782     SET_ADDRESS (&fchdr.d_id, pinfo->dst.type, pinfo->dst.len, pinfo->dst.data);
 783     SET_ADDRESS (&fchdr.s_id, pinfo->src.type, pinfo->src.len, pinfo->src.data);
 784
 785     fchdr.cs_ctl = tvb_get_guint8 (tvb, offset+4);
 786     fchdr.type  = tvb_get_guint8 (tvb, offset+8);
 787     fchdr.fctl=tvb_get_ntoh24(tvb,offset+9);
 788     fchdr.seqcnt = tvb_get_ntohs (tvb, offset+14);
 789     fchdr.oxid=tvb_get_ntohs(tvb,offset+16);
 790     fchdr.rxid=tvb_get_ntohs(tvb,offset+18);
 791     param = tvb_get_ntohl (tvb, offset+20);
 792     seq_id = tvb_get_guint8 (tvb, offset+12);
 793
 794     pinfo->oxid = fchdr.oxid;
 795     pinfo->rxid = fchdr.rxid;
 796     pinfo->ptype = PT_EXCHG;
 797     pinfo->r_ctl = fchdr.r_ctl;
 798
 799     is_ack = ((fchdr.r_ctl == 0xC0) || (fchdr.r_ctl == 0xC1));
 800
 801     /* There are two ways to determine if this is the first frame of a
 802      * sequence. Either:
 803      * (i) The SOF bits indicate that this is the first frame OR
 804      * (ii) This is an SOFf frame and seqcnt is 0.
 805      */
 806     is_1frame_inseq = (((pinfo->sof_eof & PINFO_SOF_FIRST_FRAME) == PINFO_SOF_FIRST_FRAME) ||
 807                        (((pinfo->sof_eof & PINFO_SOF_SOFF) == PINFO_SOF_SOFF) &&
 808                         (fchdr.seqcnt == 0)));
 809
 810     is_lastframe_inseq = ((pinfo->sof_eof & PINFO_EOF_LAST_FRAME) == PINFO_EOF_LAST_FRAME);
 811
 812     if ((pinfo->sof_eof & PINFO_SOF_SOFF) == PINFO_SOF_SOFF) {
 813         is_lastframe_inseq = fchdr.fctl & FC_FCTL_SEQ_LAST;
 814     }
 815     is_valid_frame = ((pinfo->sof_eof & 0x40) == 0x40);
 816
 817     ftype = fc_get_ftype (fchdr.r_ctl, fchdr.type);
 818
 819     if (check_col (pinfo->cinfo, COL_INFO)) {
 820          col_add_str (pinfo->cinfo, COL_INFO, val_to_str (ftype, fc_ftype_vals,
 821                                                           "Unknown Type (0x%x)"));
 822
 823         if (ftype == FC_FTYPE_LINKCTL)
 824             col_append_fstr (pinfo->cinfo, COL_INFO, ", %s",
 825                              val_to_str ((fchdr.r_ctl & 0x0F),
 826                                           fc_lctl_proto_val,
 827                                           "LCTL 0x%x"));
 828     }
 829
 830     /* In the interest of speed, if "tree" is NULL, don't do any work not
 831        necessary to generate protocol tree items. */
 832     if (tree) {
 833         ti = proto_tree_add_protocol_format (tree, proto_fc, tvb, offset,
 834                                              FC_HEADER_SIZE, "Fibre Channel");
 835         fc_tree = proto_item_add_subtree (ti, ett_fc);
 836     }
 837
 838     /* Highlight EISL header, if present */
 839     if (eisl_offset != -1) {
 840         proto_tree_add_item (fc_tree, hf_fc_eisl, tvb, eisl_offset, 8, 0);
 841     }
 842
 843     /* match first exchange with last exchange */
 844     if(fchdr.fctl&FC_FCTL_EXCHANGE_FIRST){
 845         if(!pinfo->fd->flags.visited){
 846             fc_exchange_data fced, *old_fced;
 847
 848             /* first check if we already have seen this exchange and it
 849                is still open/unmatched.
 850             */
 851             fced.oxid=fchdr.oxid;
 852             SET_ADDRESS(&fced.s_id, fchdr.s_id.type, fchdr.s_id.len, fchdr.s_id.data);
 853             SET_ADDRESS(&fced.d_id, fchdr.d_id.type, fchdr.d_id.len, fchdr.d_id.data);
 854             old_fced=g_hash_table_lookup(fc_exchange_unmatched, &fced);
 855             if(old_fced){
 856                 g_hash_table_remove(fc_exchange_unmatched, old_fced);
 857             }
 858             old_fced=se_alloc(sizeof(fc_exchange_data));
 859             old_fced->oxid=fchdr.oxid;
 860             COPY_ADDRESS(&old_fced->s_id, &fchdr.s_id);
 861             COPY_ADDRESS(&old_fced->d_id, &fchdr.d_id);
 862             old_fced->first_exchange_frame=pinfo->fd->num;
 863             old_fced->fc_time.nsecs = pinfo->fd->abs_usecs*1000;
 864             old_fced->fc_time.secs = pinfo->fd->abs_secs;
 865             g_hash_table_insert(fc_exchange_unmatched, old_fced, old_fced);
 866             fc_ex=old_fced;
 867         } else {
 868             fc_exchange_data fced, *old_fced;
 869             fced.oxid=fchdr.oxid;
 870             fced.first_exchange_frame=pinfo->fd->num;
 871             fced.last_exchange_frame=0;
 872             old_fced=g_hash_table_lookup(fc_exchange_matched, &fced);
 873             fc_ex=old_fced;
 874         }
 875     }
 876     if(fchdr.fctl&FC_FCTL_EXCHANGE_LAST){
 877         if(!pinfo->fd->flags.visited){
 878             fc_exchange_data fced, *old_fced;
 879
 880             fced.oxid=fchdr.oxid;
 881             SET_ADDRESS(&fced.s_id, fchdr.d_id.type, fchdr.d_id.len, fchdr.d_id.data);
 882             SET_ADDRESS(&fced.d_id, fchdr.s_id.type, fchdr.s_id.len, fchdr.s_id.data);
 883             old_fced=g_hash_table_lookup(fc_exchange_unmatched, &fced);
 884             if(old_fced){
 885                 g_hash_table_remove(fc_exchange_unmatched, old_fced);
 886                 old_fced->last_exchange_frame=pinfo->fd->num;
 887                 g_hash_table_insert(fc_exchange_matched, old_fced, old_fced);
 888             }
 889             fc_ex=old_fced;
 890         } else {
 891             fc_exchange_data fced, *old_fced;
 892             fced.oxid=fchdr.oxid;
 893             fced.first_exchange_frame=0;
 894             fced.last_exchange_frame=pinfo->fd->num;
 895             old_fced=g_hash_table_lookup(fc_exchange_matched, &fced);
 896             fc_ex=old_fced;
 897         }
 898     }
 899     if(fc_ex){
 900         if(fchdr.fctl&FC_FCTL_EXCHANGE_FIRST){
 901             proto_tree_add_uint(fc_tree, hf_fc_exchange_last_frame, tvb, 0, 0, fc_ex->last_exchange_frame);
 902         }
 903         if(fchdr.fctl&FC_FCTL_EXCHANGE_LAST){
 904             nstime_t delta_time;
 905             proto_tree_add_uint(fc_tree, hf_fc_exchange_first_frame, tvb, 0, 0, fc_ex->first_exchange_frame);
 906             delta_time.secs = pinfo->fd->abs_secs - fc_ex->fc_time.secs;
 907             delta_time.nsecs = pinfo->fd->abs_usecs*1000 - fc_ex->fc_time.nsecs;
 908             if (delta_time.nsecs<0){
 909                 delta_time.nsecs+=1000000000;
 910                 delta_time.secs--;
 911             }
 912             proto_tree_add_time(ti, hf_fc_time, tvb, 0, 0, &delta_time);
 913         }
 914     }
 915     fchdr.fced=fc_ex;
 916
 917     switch (fchdr.r_ctl & 0xF0) {
 918
 919     case FC_RCTL_DEV_DATA:
 920     case FC_RCTL_LINK_DATA:
 921     case FC_RCTL_VIDEO:
 922         /* the lower 4 bits of R_CTL are the information category */
 923         proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 924                                     FC_RCTL_SIZE, fchdr.r_ctl,
 925                                     "R_CTL: 0x%x(%s/%s)",
 926                                     fchdr.r_ctl,
 927                                     val_to_str ((fchdr.r_ctl & 0xF0),
 928                                                 fc_routing_val, "0x%x"),
 929                                     val_to_str ((fchdr.r_ctl & 0x0F),
 930                                                 fc_iu_val, "0x%x"));
 931         break;
 932
 933     case FC_RCTL_LINK_CTL:
 934         /* the lower 4 bits of R_CTL indicate the type of link ctl frame */
 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_lctl_proto_val, "0x%x"));
 943         break;
 944
 945     case FC_RCTL_BLS:
 946         switch (fchdr.type) {
 947
 948         case 0x00:
 949             /* the lower 4 bits of R_CTL indicate the type of BLS frame */
 950             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 951                                         FC_RCTL_SIZE, fchdr.r_ctl,
 952                                         "R_CTL: 0x%x(%s/%s)",
 953                                         fchdr.r_ctl,
 954                                         val_to_str ((fchdr.r_ctl & 0xF0),
 955                                                     fc_routing_val, "0x%x"),
 956                                         val_to_str ((fchdr.r_ctl & 0x0F),
 957                                                     fc_bls_proto_val, "0x%x"));
 958             break;
 959
 960         default:
 961             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 962                                         FC_RCTL_SIZE, fchdr.r_ctl,
 963                                         "R_CTL: 0x%x(%s/0x%x)",
 964                                         fchdr.r_ctl,
 965                                         val_to_str ((fchdr.r_ctl & 0xF0),
 966                                                     fc_routing_val, "0x%x"),
 967                                         fchdr.r_ctl & 0x0F);
 968             break;
 969         }
 970         break;
 971
 972     case FC_RCTL_ELS:
 973         switch (fchdr.type) {
 974
 975         case 0x01:
 976             /* the lower 4 bits of R_CTL indicate the type of ELS frame */
 977             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 978                                         FC_RCTL_SIZE, fchdr.r_ctl,
 979                                         "R_CTL: 0x%x(%s/%s)",
 980                                         fchdr.r_ctl,
 981                                         val_to_str ((fchdr.r_ctl & 0xF0),
 982                                                     fc_routing_val, "0x%x"),
 983                                         val_to_str ((fchdr.r_ctl & 0x0F),
 984                                                     fc_els_proto_val, "0x%x"));
 985             break;
 986
 987         default:
 988             proto_tree_add_uint_format (fc_tree, hf_fc_rctl, tvb, offset,
 989                                         FC_RCTL_SIZE, fchdr.r_ctl,
 990                                         "R_CTL: 0x%x(%s/0x%x)",
 991                                         fchdr.r_ctl,
 992                                         val_to_str ((fchdr.r_ctl & 0xF0),
 993                                                     fc_routing_val, "0x%x"),
 994                                         fchdr.r_ctl & 0x0F);
 995             break;
 996         }
 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
1010     proto_tree_add_uint_hidden (fc_tree, hf_fc_ftype, tvb, offset, 1,
1011                            ftype);
1012
1013     /* XXX - use "fc_wka_vals[]" on this? */
1014     proto_tree_add_string (fc_tree, hf_fc_did, tvb, offset+1, 3,
1015                            fc_to_str (fchdr.d_id.data));
1016     proto_tree_add_string_hidden (fc_tree, hf_fc_id, tvb, offset+1, 3,
1017                            fc_to_str (fchdr.d_id.data));
1018
1019     proto_tree_add_uint (fc_tree, hf_fc_csctl, tvb, offset+4, 1, fchdr.cs_ctl);
1020
1021     /* XXX - use "fc_wka_vals[]" on this? */
1022     proto_tree_add_string (fc_tree, hf_fc_sid, tvb, offset+5, 3,
1023                            fc_to_str (fchdr.s_id.data));
1024     proto_tree_add_string_hidden (fc_tree, hf_fc_id, tvb, offset+5, 3,
1025                            fc_to_str (fchdr.s_id.data));
1026
1027     if (ftype == FC_FTYPE_LINKCTL) {
1028         if (((fchdr.r_ctl & 0x0F) == FC_LCTL_FBSYB) ||
1029             ((fchdr.r_ctl & 0x0F) == FC_LCTL_FBSYL)) {
1030             /* for F_BSY frames, the upper 4 bits of the type field specify the
1031              * reason for the BSY.
1032              */
1033             proto_tree_add_uint_format (fc_tree, hf_fc_type, tvb,
1034                                         offset+8, FC_TYPE_SIZE,
1035                                         fchdr.type,"Type: 0x%x(%s)", fchdr.type,
1036                                         fclctl_get_typestr ((guint8) (fchdr.r_ctl & 0x0F),
1037                                                             fchdr.type));
1038         } else {
1039             proto_tree_add_item (fc_tree, hf_fc_type, tvb, offset+8, 1, FALSE);
1040         }
1041     } else {
1042         proto_tree_add_item (fc_tree, hf_fc_type, tvb, offset+8, 1, FALSE);
1043     }
1044
1045
1046     dissect_fc_fctl(pinfo, fc_tree, tvb, offset+9, is_ack, fchdr.fctl);
1047
1048
1049     proto_tree_add_item (fc_tree, hf_fc_seqid, tvb, offset+12, 1, FALSE);
1050
1051     df_ctl = tvb_get_guint8(tvb, offset+13);
1052
1053     proto_tree_add_uint (fc_tree, hf_fc_dfctl, tvb, offset+13, 1, df_ctl);
1054     proto_tree_add_uint (fc_tree, hf_fc_seqcnt, tvb, offset+14, 2, fchdr.seqcnt);
1055     proto_tree_add_uint (fc_tree, hf_fc_oxid, tvb, offset+16, 2, fchdr.oxid);
1056     proto_tree_add_uint (fc_tree, hf_fc_rxid, tvb, offset+18, 2, fchdr.rxid);
1057
1058     if (ftype == FC_FTYPE_LINKCTL) {
1059         if (((fchdr.r_ctl & 0x0F) == FC_LCTL_FRJT) ||
1060             ((fchdr.r_ctl & 0x0F) == FC_LCTL_PRJT) ||
1061             ((fchdr.r_ctl & 0x0F) == FC_LCTL_PBSY)) {
1062             /* In all these cases of Link Ctl frame, the parameter field
1063              * encodes the detailed error message
1064              */
1065             proto_tree_add_uint_format (fc_tree, hf_fc_param, tvb,
1066                                         offset+20, 4, param,
1067                                         "Parameter: 0x%x(%s)", param,
1068                                         fclctl_get_paramstr ((fchdr.r_ctl & 0x0F),
1069                                                              param));
1070         } else {
1071             proto_tree_add_item (fc_tree, hf_fc_param, tvb, offset+20, 4, FALSE);
1072         }
1073     } else if (ftype == FC_FTYPE_BLS) {
1074         if ((fchdr.r_ctl & 0x0F) == FC_BLS_ABTS) {
1075             proto_tree_add_uint_format (fc_tree, hf_fc_param, tvb,
1076                                         offset+20, 4, param,
1077                                         "Parameter: 0x%x(%s)", param,
1078                                         ((param & 0x0F) == 1 ? "Abort Sequence" :
1079                                          "Abort Exchange"));
1080         } else {
1081             proto_tree_add_item (fc_tree, hf_fc_param, tvb, offset+20,
1082                                  4, FALSE);
1083         }
1084     } else {
1085         proto_tree_add_item (fc_tree, hf_fc_param, tvb, offset+20, 4, FALSE);
1086     }
1087
1088     /* Skip the Frame_Header */
1089     next_offset = offset + FC_HEADER_SIZE;
1090
1091     /* Network_Header present? */
1092     if (df_ctl & FC_DFCTL_NH) {
1093         /* Yes - dissect it. */
1094         if (tree) {
1095             proto_tree_add_string (fc_tree, hf_fc_nh_da, tvb, next_offset, 8,
1096                                    fcwwn_to_str (tvb_get_ptr (tvb, offset, 8)));
1097             proto_tree_add_string (fc_tree, hf_fc_nh_sa, tvb, offset+8, 8,
1098                                    fcwwn_to_str (tvb_get_ptr (tvb, offset+8, 8)));
1099         }
1100         next_offset += 16;
1101     }
1102
1103     /* XXX - handle Association_Header and Device_Header here */
1104
1105     if (ftype == FC_FTYPE_LINKCTL) {
1106         /* ACK_1 frames and other LINK_CTL frames echo the last seq bit if the
1107          * packet they're ack'ing did not have it set. So, we'll incorrectly
1108          * flag them as being fragmented when they're not. This fixes the
1109          * problem
1110          */
1111         is_lastframe_inseq = TRUE;
1112     } else {
1113         /* XXX is this right?   offset 20, shouldnt it be offset 9? */
1114         is_exchg_resp = ((tvb_get_guint8 (tvb, offset+20) & 0x80) == 0x80);
1115     }
1116
1117     if (tvb_reported_length (tvb) <= FC_HEADER_SIZE)
1118         THROW(ReportedBoundsError);
1119
1120     frag_size = tvb_reported_length (tvb)-FC_HEADER_SIZE;
1121
1122     /* If there is an MDS header, we need to subtract the MDS trailer size */
1123     if ((pinfo->ethertype == ETHERTYPE_UNK) || (pinfo->ethertype == ETHERTYPE_FCFT)) {
1124         if (frag_size <= MDSHDR_TRAILER_SIZE)
1125             THROW(ReportedBoundsError);
1126         frag_size -= MDSHDR_TRAILER_SIZE;
1127     } else if (pinfo->ethertype == ETHERTYPE_BRDWALK) {
1128         if (frag_size <= 8)
1129             THROW(ReportedBoundsError);
1130         frag_size -= 8;         /* 4 byte of FC CRC +
1131                                    4 bytes of error+EOF = 8 bytes  */
1132     }
1133
1134     if (!is_lastframe_inseq) {
1135         /* Show this only as a fragmented FC frame */
1136         if (check_col (pinfo->cinfo, COL_INFO)) {
1137             col_append_str (pinfo->cinfo, COL_INFO, " (Fragmented)");
1138         }
1139     }
1140
1141     /* If this is a fragment, attempt to check if fully reassembled frame is
1142      * present, if we're configured to reassemble.
1143      */
1144     if ((ftype != FC_FTYPE_LINKCTL) && (ftype != FC_FTYPE_BLS) &&
1145         (!is_lastframe_inseq || !is_1frame_inseq) && fc_reassemble &&
1146         tvb_bytes_exist(tvb, FC_HEADER_SIZE, frag_size) && tree) {
1147         /* Add this to the list of fragments */
1148
1149         /* In certain cases such as FICON, the SEQ_CNT is streaming
1150          * i.e. continuously increasing. So, zero does not signify the
1151          * first frame of the sequence. To fix this, we need to save the
1152          * SEQ_CNT of the first frame in sequence and use this value to
1153          * determine the actual offset into a frame.
1154          */
1155         conversation = find_conversation (pinfo->fd->num, &pinfo->src, &pinfo->dst,
1156                                           pinfo->ptype, pinfo->oxid,
1157                                           pinfo->rxid, NO_PORT2);
1158         if (!conversation) {
1159             conversation = conversation_new (pinfo->fd->num, &pinfo->src, &pinfo->dst,
1160                                              pinfo->ptype, pinfo->oxid,
1161                                              pinfo->rxid, NO_PORT2);
1162         }
1163
1164         ckey.conv_idx = conversation->index;
1165
1166         cdata = (fcseq_conv_data_t *)g_hash_table_lookup (fcseq_req_hash,
1167                                                           &ckey);
1168
1169         if (is_1frame_inseq) {
1170             if (cdata) {
1171                 /* Since we never free the memory used by an exchange, this maybe a
1172                  * case of another request using the same exchange as a previous
1173                  * req.
1174                  */
1175                 cdata->seq_cnt = fchdr.seqcnt;
1176             }
1177             else {
1178                 req_key = se_alloc (sizeof(fcseq_conv_key_t));
1179                 req_key->conv_idx = conversation->index;
1180
1181                 cdata = se_alloc (sizeof(fcseq_conv_data_t));
1182                 cdata->seq_cnt = fchdr.seqcnt;
1183
1184                 g_hash_table_insert (fcseq_req_hash, req_key, cdata);
1185             }
1186             real_seqcnt = 0;
1187         }
1188         else if (cdata != NULL) {
1189             real_seqcnt = fchdr.seqcnt - cdata->seq_cnt ;
1190         }
1191         else {
1192             real_seqcnt = fchdr.seqcnt;
1193         }
1194
1195         /* Verify that this is a valid fragment */
1196         if (is_lastframe_inseq && !is_1frame_inseq && !real_seqcnt) {
1197              /* This is a frame that purports to be the last frame in a
1198               * sequence, is not the first frame, but has a seqcnt that is
1199               * 0. This is a bogus frame, don't attempt to reassemble it.
1200               */
1201              next_tvb = tvb_new_subset (tvb, next_offset, -1, -1);
1202              if (check_col (pinfo->cinfo, COL_INFO)) {
1203                   col_append_str (pinfo->cinfo, COL_INFO, " (Bogus Fragment)");
1204              }
1205         } else {
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         }
1240     } else {
1241         if (tree) {
1242             proto_tree_add_boolean_hidden (fc_tree, hf_fc_reassembled,
1243                                            tvb, offset+9, 1, 0);
1244         }
1245         next_tvb = tvb_new_subset (tvb, next_offset, -1, -1);
1246     }
1247
1248     if ((ftype != FC_FTYPE_LINKCTL) && (ftype != FC_FTYPE_BLS)) {
1249         /* If relative offset is used, only dissect the pdu with
1250          * offset 0 (param) */
1251         if( (fchdr.fctl&FC_FCTL_REL_OFFSET) && param ){
1252             call_dissector (data_handle, next_tvb, pinfo, tree);
1253         } else {
1254             if (!dissector_try_port (fcftype_dissector_table, ftype,
1255                                 next_tvb, pinfo, tree)) {
1256                 call_dissector (data_handle, next_tvb, pinfo, tree);
1257             }
1258         }
1259     } else if (ftype == FC_FTYPE_BLS) {
1260         if ((fchdr.r_ctl & 0x0F) == FC_BLS_BAACC) {
1261             dissect_fc_ba_acc (next_tvb, pinfo, tree);
1262         } else if ((fchdr.r_ctl & 0x0F) == FC_BLS_BARJT) {
1263             dissect_fc_ba_rjt (next_tvb, pinfo, tree);
1264         }
1265     }
1266
1267     tap_queue_packet(fc_tap, pinfo, &fchdr);
1268 }
1269
1270 static void
1271 dissect_fc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1272 {
1273     dissect_fc_helper (tvb, pinfo, tree, FALSE);
1274 }
1275 static void
1276 dissect_fc_ifcp (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1277 {
1278     dissect_fc_helper (tvb, pinfo, tree, TRUE);
1279 }
1280
1281 /* Register the protocol with Ethereal */
1282
1283 /* this format is require because a script is used to build the C function
1284    that calls all the protocol registration.
1285 */
1286
1287 void
1288 proto_register_fc(void)
1289 {
1290
1291 /* Setup list of header fields  See Section 1.6.1 for details*/
1292     static hf_register_info hf[] = {
1293         { &hf_fc_rctl,
1294           { "R_CTL", "fc.r_ctl", FT_UINT8, BASE_HEX, NULL, 0x0,
1295             "R_CTL", HFILL }},
1296         { &hf_fc_ftype,
1297           {"Frame type", "fc.ftype", FT_UINT8, BASE_HEX, VALS(fc_ftype_vals),
1298            0x0, "Derived Type", HFILL}},
1299         { &hf_fc_did,
1300           { "Dest Addr", "fc.d_id", FT_STRING, BASE_HEX, NULL, 0x0,
1301             "Destination Address", HFILL}},
1302         { &hf_fc_csctl,
1303           {"CS_CTL", "fc.cs_ctl", FT_UINT8, BASE_HEX, NULL, 0x0,
1304            "CS_CTL", HFILL}},
1305         { &hf_fc_sid,
1306           {"Src Addr", "fc.s_id", FT_STRING, BASE_HEX, NULL, 0x0,
1307            "Source Address", HFILL}},
1308         { &hf_fc_id,
1309           {"Addr", "fc.id", FT_STRING, BASE_HEX, NULL, 0x0,
1310            "Source or Destination Address", HFILL}},
1311         { &hf_fc_type,
1312           {"Type", "fc.type", FT_UINT8, BASE_HEX, VALS (fc_fc4_val), 0x0,
1313            "", HFILL}},
1314         { &hf_fc_fctl,
1315           {"F_CTL", "fc.f_ctl", FT_UINT24, BASE_HEX, NULL, 0x0, "", HFILL}},
1316         { &hf_fc_seqid,
1317           {"SEQ_ID", "fc.seq_id", FT_UINT8, BASE_HEX, NULL, 0x0,
1318            "Sequence ID", HFILL}},
1319         { &hf_fc_dfctl,
1320           {"DF_CTL", "fc.df_ctl", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL}},
1321         { &hf_fc_seqcnt,
1322           {"SEQ_CNT", "fc.seq_cnt", FT_UINT16, BASE_DEC, NULL, 0x0,
1323            "Sequence Count", HFILL}},
1324         { &hf_fc_oxid,
1325           {"OX_ID", "fc.ox_id", FT_UINT16, BASE_HEX, NULL, 0x0, "Originator ID",
1326            HFILL}},
1327         { &hf_fc_rxid,
1328           {"RX_ID", "fc.rx_id", FT_UINT16, BASE_HEX, NULL, 0x0, "Receiver ID",
1329            HFILL}},
1330         { &hf_fc_param,
1331           {"Parameter", "fc.parameter", FT_UINT32, BASE_HEX, NULL, 0x0, "Parameter",
1332            HFILL}},
1333
1334         { &hf_fc_reassembled,
1335           {"Reassembled Frame", "fc.reassembled", FT_BOOLEAN, BASE_HEX, NULL,
1336            0x0, "", HFILL}},
1337         { &hf_fc_nh_da,
1338           {"Network DA", "fc.nethdr.da", FT_STRING, BASE_HEX, NULL,
1339            0x0, "", HFILL}},
1340         { &hf_fc_nh_sa,
1341           {"Network SA", "fc.nethdr.sa", FT_STRING, BASE_HEX, NULL,
1342            0x0, "", HFILL}},
1343
1344         /* Basic Link Svc field definitions */
1345         { &hf_fc_bls_seqid_vld,
1346           {"SEQID Valid", "fc.bls_seqidvld", FT_UINT8, BASE_HEX,
1347            VALS (fc_bls_seqid_val), 0x0, "", HFILL}},
1348         { &hf_fc_bls_lastvld_seqid,
1349           {"Last Valid SEQID", "fc.bls_lastseqid", FT_UINT8, BASE_HEX, NULL,
1350            0x0, "", HFILL}},
1351         { &hf_fc_bls_oxid,
1352           {"OXID", "fc.bls_oxid", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL}},
1353         { &hf_fc_bls_rxid,
1354           {"RXID", "fc.bls_rxid", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL}},
1355         { &hf_fc_bls_lowseqcnt,
1356           {"Low SEQCNT", "fc.bls_lseqcnt", FT_UINT16, BASE_HEX, NULL, 0x0, "",
1357            HFILL}},
1358         { &hf_fc_bls_hiseqcnt,
1359           {"High SEQCNT", "fc.bls_hseqcnt", FT_UINT16, BASE_HEX, NULL, 0x0, "",
1360            HFILL}},
1361         { &hf_fc_bls_rjtcode,
1362           {"Reason", "fc.bls_reason", FT_UINT8, BASE_HEX, VALS(fc_bls_barjt_val),
1363            0x0, "", HFILL}},
1364         { &hf_fc_bls_rjtdetail,
1365           {"Reason Explanantion", "fc.bls_rjtdetail", FT_UINT8, BASE_HEX,
1366            VALS (fc_bls_barjt_det_val), 0x0, "", HFILL}},
1367         { &hf_fc_bls_vendor,
1368           {"Vendor Unique Reason", "fc.bls_vnduniq", FT_UINT8, BASE_HEX, NULL,
1369            0x0, "", HFILL}},
1370         { &hf_fc_fctl_exchange_responder,
1371           {"ExgRpd", "fc.fctl.exchange_responder", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_exchange_responder),
1372            FC_FCTL_EXCHANGE_RESPONDER, "Exchange Responder?", HFILL}},
1373         { &hf_fc_fctl_seq_recipient,
1374           {"SeqRec", "fc.fctl.seq_recipient", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_seq_recipient),
1375            FC_FCTL_SEQ_RECIPIENT, "Seq Recipient?", HFILL}},
1376         { &hf_fc_fctl_exchange_first,
1377           {"ExgFst", "fc.fctl.exchange_first", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_exchange_first),
1378            FC_FCTL_EXCHANGE_FIRST, "First Exchange?", HFILL}},
1379         { &hf_fc_fctl_exchange_last,
1380           {"ExgLst", "fc.fctl.exchange_last", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_exchange_last),
1381            FC_FCTL_EXCHANGE_LAST, "Last Exchange?", HFILL}},
1382         { &hf_fc_fctl_seq_last,
1383           {"SeqLst", "fc.fctl.seq_last", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_seq_last),
1384            FC_FCTL_SEQ_LAST, "Last Sequence?", HFILL}},
1385         { &hf_fc_fctl_priority,
1386           {"Pri", "fc.fctl.priority", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_priority),
1387            FC_FCTL_PRIORITY, "Priority", HFILL}},
1388         { &hf_fc_fctl_transfer_seq_initiative,
1389           {"TSI", "fc.fctl.transfer_seq_initiative", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_transfer_seq_initiative),
1390            FC_FCTL_TRANSFER_SEQ_INITIATIVE, "Transfer Seq Initiative", HFILL}},
1391         { &hf_fc_fctl_rexmitted_seq,
1392           {"RetSeq", "fc.fctl.rexmitted_seq", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_rexmitted_seq),
1393            FC_FCTL_REXMITTED_SEQ, "Retransmitted Sequence", HFILL}},
1394         { &hf_fc_fctl_rel_offset,
1395           {"RelOff", "fc.fctl.rel_offset", FT_BOOLEAN, 24, TFS(&tfs_fc_fctl_rel_offset),
1396            FC_FCTL_REL_OFFSET, "rel offset", HFILL}},
1397         { &hf_fc_fctl_last_data_frame,
1398           {"LDF", "fc.fctl.last_data_frame", FT_UINT24, BASE_HEX, VALS(last_data_frame_vals),
1399            FC_FCTL_LAST_DATA_FRAME_MASK, "Last Data Frame?", HFILL}},
1400         { &hf_fc_fctl_ack_0_1,
1401           {"A01", "fc.fctl.ack_0_1", FT_UINT24, BASE_HEX, VALS(ack_0_1_vals),
1402            FC_FCTL_ACK_0_1_MASK, "Ack 0/1 value", HFILL}},
1403         { &hf_fc_fctl_abts_ack,
1404           {"AA", "fc.fctl.abts_ack", FT_UINT24, BASE_HEX, VALS(abts_ack_vals),
1405            FC_FCTL_ABTS_MASK, "ABTS ACK values", HFILL}},
1406         { &hf_fc_fctl_abts_not_ack,
1407           {"AnA", "fc.fctl.abts_not_ack", FT_UINT24, BASE_HEX, VALS(abts_not_ack_vals),
1408            FC_FCTL_ABTS_MASK, "ABTS not ACK vals", HFILL}},
1409         { &hf_fc_exchange_first_frame,
1410           { "Exchange First In", "fc.exchange_first_frame", FT_FRAMENUM, BASE_NONE, NULL,
1411            0, "The first frame of this exchange is in this frame", HFILL }},
1412         { &hf_fc_exchange_last_frame,
1413           { "Exchange Last In", "fc.exchange_last_frame", FT_FRAMENUM, BASE_NONE, NULL,
1414            0, "The last frame of this exchange is in this frame", HFILL }},
1415         { &hf_fc_time,
1416           { "Time from Exchange First", "fc.time", FT_RELATIVE_TIME, BASE_NONE, NULL,
1417            0, "Time since the first frame of the Exchange", HFILL }},
1418         { &hf_fc_eisl,
1419           {"EISL Header", "fc.eisl", FT_BYTES, BASE_HEX, NULL, 0, "EISL Header", HFILL}},
1420     };
1421
1422     /* Setup protocol subtree array */
1423     static gint *ett[] = {
1424         &ett_fc,
1425         &ett_fcbls,
1426         &ett_fctl
1427     };
1428
1429     module_t *fc_module;
1430
1431     /* Register the protocol name and description */
1432     proto_fc = proto_register_protocol ("Fibre Channel", "FC", "fc");
1433     register_dissector ("fc", dissect_fc, proto_fc);
1434     register_dissector ("fc_ifcp", dissect_fc_ifcp, proto_fc);
1435     fc_tap = register_tap("fc");
1436
1437     /* Required function calls to register the header fields and subtrees used */
1438     proto_register_field_array(proto_fc, hf, array_length(hf));
1439     proto_register_subtree_array(ett, array_length(ett));
1440
1441     fcftype_dissector_table = register_dissector_table ("fc.ftype",
1442                                                         "FC Frame Type",
1443                                                         FT_UINT8, BASE_HEX);
1444
1445     /* Register preferences */
1446     fc_module = prefs_register_protocol (proto_fc, NULL);
1447     prefs_register_bool_preference (fc_module,
1448                                     "reassemble",
1449                                     "Reassemble multi-frame sequences",
1450                                     "If enabled, reassembly of multi-frame "
1451                                     "sequences is done",
1452                                     &fc_reassemble);
1453     prefs_register_uint_preference (fc_module,
1454                                     "max_frame_size", "Max FC Frame Size",
1455                                     "This is the size of non-last frames in a "
1456                                     "multi-frame sequence", 10,
1457                                     &fc_max_frame_size);
1458
1459     register_init_routine(fc_defragment_init);
1460     register_init_routine (fc_exchange_init_protocol);
1461 }
1462
1463
1464 /* If this dissector uses sub-dissector registration add a registration routine.
1465    This format is required because a script is used to find these routines and
1466    create the code that calls these routines.
1467 */
1468 void
1469 proto_reg_handoff_fc (void)
1470 {
1471     data_handle = find_dissector("data");
1472 }