epan/dissectors/packet-cpfi.c

   1 /* packet-cpfi.c
   2  * Routines for CPFI Cross Point Frame Injector dissection
   3  * CPFI - Cross Point Frame Injector is a CNT proprietary
   4  * protocol used to carry Fibre Channel data over UDP
   5  *
   6  * Copyright 2003, Dave Sclarsky <dave_sclarsky[AT]cnt.com>
   7  *
   8  * $Id$
   9  *
  10  * Wireshark - Network traffic analyzer
  11  * By Gerald Combs <gerald@wireshark.org>
  12  * Copyright 1998 Gerald Combs
  13  *
  14  * Copied from packet-m2tp.c
  15  * Thanks to Heinz Prantner for his motivation and assistance
  16  *
  17  * This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License
  19  * as published by the Free Software Foundation; either version 2
  20  * of the License, or (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  30  */
  31
  32 #include "config.h"
  33
  34 #include <glib.h>
  35
  36 #include <epan/packet.h>
  37 #include <epan/prefs.h>
  38
  39 void proto_register_cpfi(void);
  40 void proto_reg_handoff_cpfi(void);
  41
  42 #define CPFI_DEFAULT_UDP_PORT      5000
  43 #define CPFI_DEFAULT_TTOT_UDP_PORT 5001
  44
  45 #define FIRST_TIO_CARD_ADDRESS    0x380
  46
  47
  48 /* SOF defines */
  49 #define CPFI_FRAME_TYPE_MASK  0xF0000000
  50 #define CPFI_FRAME_TYPE_SHIFT 28
  51 #define CPFI_SOURCE_MASK      0x0FFC0000
  52 #define CPFI_SOURCE_SHIFT     18
  53 #define CPFI_DEST_MASK        0x0003FF00
  54 #define CPFI_DEST_SHIFT       8
  55 #define CPFI_SOF_TYPE_MASK    0x000000F0
  56 #define CPFI_SPEED_MASK       0x0000000C
  57 #define CPFI_OPM_ERROR_MASK   0x00000002
  58 #define CPFI_FROM_LCM_MASK    0x00000001
  59
  60 /* EOF defines */
  61 #define CPFI_EOF_TYPE_MASK    0x78000000
  62 #define CPFI_EOF_ERROR_MASK   0x7FE00000
  63
  64 /* configurable parameters */
  65 static guint gbl_cpfi_udp_port      = CPFI_DEFAULT_UDP_PORT;
  66 static guint gbl_cpfi_ttot_udp_port = CPFI_DEFAULT_TTOT_UDP_PORT;
  67 static gboolean cpfi_arrow_moves    = TRUE;
  68
  69 /* Initialize the protocol and registered fields */
  70 static int proto_cpfi = -1;
  71 static int hf_cpfi_word_one = -1;
  72 static int hf_cpfi_word_two = -1;
  73 /* SOF word 1: */
  74 static int hf_cpfi_frame_type = -1;
  75 static int hf_cpfi_source = -1;
  76 static int hf_cpfi_dest = -1;
  77 static int hf_cpfi_SOF_type = -1;
  78 static int hf_cpfi_speed = -1;
  79 static int hf_cpfi_OPM_error = -1;
  80 static int hf_cpfi_from_LCM = -1;
  81 /* EOF */
  82 static int hf_cpfi_CRC_32 = -1;
  83 static int hf_cpfi_EOF_type = -1;
  84 /* Hidden items */
  85 static int hf_cpfi_t_instance = -1;
  86 static int hf_cpfi_t_src_instance = -1;
  87 static int hf_cpfi_t_dst_instance = -1;
  88 static int hf_cpfi_t_board = -1;
  89 static int hf_cpfi_t_src_board = -1;
  90 static int hf_cpfi_t_dst_board = -1;
  91 static int hf_cpfi_t_port = -1;
  92 static int hf_cpfi_t_src_port = -1;
  93 static int hf_cpfi_t_dst_port = -1;
  94
  95 static guint32 word1;
  96 static guint32 word2;
  97 static guint8 frame_type;
  98 static char src_str[20];
  99 static char dst_str[20];
 100 static char l_to_r_arrow[] = "-->";
 101 static char r_to_l_arrow[] = "<--";
 102 static const char *left = src_str;
 103 static const char *right = dst_str;
 104 static const char *arrow = l_to_r_arrow;
 105 static const char direction_and_port_string[] = "[%s %s %s] ";
 106
 107
 108 /* Initialize the subtree pointers */
 109 static gint ett_cpfi = -1;
 110 static gint ett_cpfi_header = -1;
 111 static gint ett_cpfi_footer = -1;
 112
 113 static dissector_handle_t fc_handle;
 114
 115
 116 static const value_string sof_type_vals[] = {
 117     {0,     "SOFf"},
 118     {1,     "SOFi2"},
 119     {2,     "SOFn2"},
 120     {3,     "SOFi3"},
 121     {4,     "SOFn3"},
 122     {5,     "SOFc1"},
 123     {6,     "SOFi1"},
 124     {7,     "SOFn1"},
 125     {8,     "SOFc4"},
 126     {9,     "SOFi4"},
 127     {10,    "SOFn4"},
 128     {0, NULL},
 129 };
 130
 131 static const value_string speed_vals[] = {
 132     {0,     "1 GBIT"},
 133     {1,     "2 GBIT"},
 134     {2,     "4 GBIT"},
 135     {3,     "10 GBIT"},
 136     {0, NULL},
 137 };
 138
 139 static const value_string eof_type_vals[] = {
 140     {0,     "EOFn"},
 141     {1,     "EOFt"},
 142     {2,     "EOFni"},
 143     {3,     "EOFa"},
 144     {4,     "EOFdt"},
 145     {5,     "EOFdti"},
 146     {6,     "EOFrt"},
 147     {7,     "EOFrti"},
 148     {0, NULL},
 149 };
 150
 151 /* Header */
 152 static void
 153 dissect_cpfi_header(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 154 {
 155   guint32 tda;
 156   guint32 src;
 157   guint8 src_instance = 0;
 158   guint8 src_board = 0;
 159   guint8 src_port = 0;
 160   guint32 dst;
 161   guint8 dst_instance = 0;
 162   guint8 dst_board = 0;
 163   guint8 dst_port = 0;
 164   proto_item *extra_item = NULL;
 165   proto_tree *extra_tree = NULL;
 166   proto_item *hidden_item;
 167
 168   /* add a tree for the header */
 169   if ( tree != NULL)
 170   {
 171     extra_item = proto_tree_add_protocol_format(tree, proto_cpfi, tvb, 0, -1, "Header");
 172     extra_tree = proto_item_add_subtree(extra_item, ett_cpfi_header);
 173   }
 174
 175   /* Extract the common header, and get the bits we need */
 176   word1 = tvb_get_ntohl (tvb, 0);
 177   word2 = tvb_get_ntohl (tvb, sizeof(word1));
 178
 179   /* Figure out where the frame came from. dstTDA is source of frame! */
 180   tda = (word1 & CPFI_DEST_MASK) >> CPFI_DEST_SHIFT;
 181   if ( tda >= FIRST_TIO_CARD_ADDRESS )
 182   {
 183     g_strlcpy(src_str, " CPFI", sizeof(src_str));
 184     src = 0;                            /* Make it smallest */
 185   }
 186   else
 187   {
 188     const guint8 *srcmac;
 189
 190     /* Make sure this is an Ethernet address. */
 191     DISSECTOR_ASSERT(pinfo->src.type == AT_ETHER);
 192     srcmac = (const guint8 *)pinfo->src.data;
 193
 194     src_instance = srcmac[2]-1;
 195     src_board = tda >> 4;
 196     src_port = tda & 0x0f;
 197     src = (1 << 24)  +  (src_instance << 16) + (src_board << 8) + src_port;
 198     g_snprintf(src_str, sizeof(src_str), "%u.%u.%u", src_instance, src_board, src_port);
 199   }
 200
 201   /* Figure out where the frame is going. srcTDA is destination of frame! */
 202   tda = (word1 & CPFI_SOURCE_MASK) >> CPFI_SOURCE_SHIFT;
 203   if ( tda >= FIRST_TIO_CARD_ADDRESS )
 204   {
 205     g_strlcpy(dst_str, " CPFI", sizeof(dst_str));
 206     dst = 0;                            /* Make it smallest */
 207   }
 208   else
 209   {
 210     const guint8 *dstmac;
 211
 212     /* Make sure this is an Ethernet address. */
 213     DISSECTOR_ASSERT(pinfo->dst.type == AT_ETHER);
 214     dstmac = (const guint8 *)pinfo->dst.data;
 215
 216     dst_instance = dstmac[2]-1;
 217     dst_board = tda >> 4;
 218     dst_port = tda & 0x0f;
 219     dst = (1 << 24)  +  (dst_instance << 16) + (dst_board << 8) + dst_port;
 220     g_snprintf(dst_str, sizeof(dst_str), "%u.%u.%u", dst_instance, dst_board, dst_port);
 221   }
 222
 223   /* Set up the source and destination and arrow per user configuration. */
 224   if ( cpfi_arrow_moves  &&  (dst < src) )
 225   {
 226     left = dst_str;
 227     arrow = r_to_l_arrow;
 228     right = src_str;
 229   }
 230   else
 231   {
 232     left = src_str;
 233     arrow = l_to_r_arrow;
 234     right = dst_str;
 235   }
 236
 237   if (extra_tree) {
 238     /* For "real" TDAs (i.e. not for microTDAs), add hidden addresses to allow filtering */
 239     if ( src != 0 )
 240     {
 241       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_instance, tvb, 0, 1, &src_instance);
 242       PROTO_ITEM_SET_HIDDEN(hidden_item);
 243       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_src_instance, tvb, 0, 1, &src_instance);
 244       PROTO_ITEM_SET_HIDDEN(hidden_item);
 245       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_board, tvb, 0, 1, &src_board);
 246       PROTO_ITEM_SET_HIDDEN(hidden_item);
 247       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_src_board, tvb, 0, 1, &src_board);
 248       PROTO_ITEM_SET_HIDDEN(hidden_item);
 249       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_port, tvb, 0, 1, &src_port);
 250       PROTO_ITEM_SET_HIDDEN(hidden_item);
 251       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_src_port, tvb, 0, 1, &src_port);
 252       PROTO_ITEM_SET_HIDDEN(hidden_item);
 253     }
 254     if ( dst != 0 )
 255     {
 256       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_instance, tvb, 0, 1, &dst_instance);
 257       PROTO_ITEM_SET_HIDDEN(hidden_item);
 258       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_dst_instance, tvb, 0, 1, &dst_instance);
 259       PROTO_ITEM_SET_HIDDEN(hidden_item);
 260       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_board, tvb, 0, 1, &dst_board);
 261       PROTO_ITEM_SET_HIDDEN(hidden_item);
 262       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_dst_board, tvb, 0, 1, &dst_board);
 263       PROTO_ITEM_SET_HIDDEN(hidden_item);
 264       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_port, tvb, 0, 1, &dst_port);
 265       PROTO_ITEM_SET_HIDDEN(hidden_item);
 266       hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_dst_port, tvb, 0, 1, &dst_port);
 267       PROTO_ITEM_SET_HIDDEN(hidden_item);
 268     }
 269
 270     /* add word 1 components to the protocol tree */
 271     proto_tree_add_item(extra_tree, hf_cpfi_word_one  , tvb, 0, 4, ENC_BIG_ENDIAN);
 272
 273     proto_tree_add_item(extra_tree, hf_cpfi_frame_type, tvb, 0, 4, ENC_BIG_ENDIAN);
 274     proto_tree_add_item(extra_tree, hf_cpfi_source    , tvb, 0, 4, ENC_BIG_ENDIAN);
 275     proto_tree_add_item(extra_tree, hf_cpfi_dest      , tvb, 0, 4, ENC_BIG_ENDIAN);
 276     proto_tree_add_item(extra_tree, hf_cpfi_SOF_type  , tvb, 0, 4, ENC_BIG_ENDIAN);
 277     proto_tree_add_item(extra_tree, hf_cpfi_speed     , tvb, 0, 4, ENC_BIG_ENDIAN);
 278     proto_tree_add_item(extra_tree, hf_cpfi_OPM_error , tvb, 0, 4, ENC_BIG_ENDIAN);
 279     proto_tree_add_item(extra_tree, hf_cpfi_from_LCM  , tvb, 0, 4, ENC_BIG_ENDIAN);
 280
 281     /* add word 2 components to the protocol tree */
 282     proto_tree_add_item(extra_tree, hf_cpfi_word_two  , tvb, 4, 4, ENC_BIG_ENDIAN);
 283   };
 284 }
 285
 286 /* Footer */
 287 static void
 288 dissect_cpfi_footer(tvbuff_t *tvb, proto_tree *tree)
 289 {
 290   proto_item *extra_item = NULL;
 291   proto_tree *extra_tree = NULL;
 292
 293   /* add a tree for the footer */
 294   if ( tree != NULL)
 295   {
 296     extra_item = proto_tree_add_protocol_format(tree, proto_cpfi, tvb, 0, -1, "Footer");
 297     extra_tree = proto_item_add_subtree(extra_item, ett_cpfi_footer);
 298   }
 299
 300   if (extra_tree) {
 301     proto_tree_add_item(extra_tree, hf_cpfi_CRC_32  , tvb, 0, 4, ENC_BIG_ENDIAN);
 302     proto_tree_add_item(extra_tree, hf_cpfi_EOF_type, tvb, 4, 4, ENC_BIG_ENDIAN);
 303   }
 304 }
 305
 306 /* CPFI */
 307 static int
 308 dissect_cpfi(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
 309 {
 310   tvbuff_t *header_tvb, *body_tvb, *footer_tvb;
 311   proto_item *cpfi_item = NULL;
 312   proto_tree *cpfi_tree = NULL;
 313   gint length, reported_length, body_length, reported_body_length;
 314
 315   frame_type = (tvb_get_ntohl (message_tvb, 0) & CPFI_FRAME_TYPE_MASK) >> CPFI_FRAME_TYPE_SHIFT;
 316
 317   /*  If this is not a CPFI frame, return 0 to let another dissector try to
 318    *  dissect it.
 319    */
 320   if ( !((frame_type == 9) && fc_handle) )
 321     return 0;
 322
 323   /* If we don't have Ethernet addresses, can't do further dissection... */
 324   if (pinfo->dst.type != AT_ETHER || pinfo->src.type != AT_ETHER)
 325     return 0;
 326
 327   length = tvb_length_remaining(message_tvb, 8);
 328   reported_length = tvb_reported_length_remaining(message_tvb, 8);
 329   if (reported_length < 8)
 330   {
 331     /* We don't even have enough for the footer. */
 332     return 0;
 333   }
 334
 335   /* Length of packet, minus the footer. */
 336   reported_body_length = reported_length - 8;
 337   /* How much of that do we have in the tvbuff? */
 338   body_length = length;
 339   if (body_length > reported_body_length)
 340     body_length = reported_body_length;
 341
 342   length = tvb_length_remaining(message_tvb, 8+body_length);
 343   if (length < 0)
 344   {
 345     /* The footer wasn't captured at all.
 346        XXX - we'd like to throw a BoundsError if that's the case. */
 347     return 0;
 348   }
 349
 350   /* In the interest of speed, if "tree" is NULL, don't do any work not
 351      necessary to generate protocol tree items. */
 352   if (tree) {
 353     /* create the protocol tree */
 354     cpfi_item = proto_tree_add_item(tree, proto_cpfi, message_tvb, 0, -1, ENC_NA);
 355     cpfi_tree = proto_item_add_subtree(cpfi_item, ett_cpfi);
 356   }
 357
 358   /* Set up the frame controls - can we do better than this? */
 359   pinfo->sof_eof = 0;
 360   pinfo->sof_eof = PINFO_SOF_FIRST_FRAME;
 361   pinfo->sof_eof |= PINFO_EOF_LAST_FRAME;
 362   pinfo->sof_eof |= PINFO_EOF_INVALID;
 363
 364   /* dissect the message */
 365
 366   /* extract and process the header */
 367   header_tvb = tvb_new_subset(message_tvb, 0, 8, 8);
 368   dissect_cpfi_header(header_tvb, pinfo, cpfi_tree);
 369
 370   body_tvb = tvb_new_subset(message_tvb, 8, body_length, reported_body_length);
 371   call_dissector(fc_handle, body_tvb, pinfo, tree);
 372
 373   /* add more info, now that FC added its */
 374   proto_item_append_text(cpfi_item, direction_and_port_string, left, arrow, right);
 375   col_prepend_fstr(pinfo->cinfo, COL_INFO, direction_and_port_string, left, arrow, right);
 376
 377   /* Do the footer */
 378   footer_tvb = tvb_new_subset(message_tvb, 8+body_length, length, 8);
 379   dissect_cpfi_footer(footer_tvb, cpfi_tree);
 380
 381   return(tvb_length(message_tvb));
 382
 383 }
 384
 385 /* Register the protocol with Wireshark */
 386 void
 387 proto_register_cpfi(void)
 388 {
 389   module_t *cpfi_module;
 390
 391   /* Setup list of header fields */
 392   static hf_register_info hf[] = {
 393
 394     { &hf_cpfi_word_one,
 395       { "Word one", "cpfi.word_one",
 396         FT_UINT32, BASE_HEX, NULL, 0x0,
 397         NULL, HFILL}},
 398     { &hf_cpfi_word_two,
 399       { "Word two", "cpfi.word_two",
 400         FT_UINT32, BASE_HEX, NULL, 0x0,
 401         NULL, HFILL}},
 402
 403     { &hf_cpfi_frame_type,
 404       { "FrmType", "cpfi.frmtype",
 405         FT_UINT32, BASE_HEX, NULL, CPFI_FRAME_TYPE_MASK,
 406         "Frame Type", HFILL}},
 407     { &hf_cpfi_source,
 408       { "srcTDA", "cpfi.srcTDA",
 409         FT_UINT32, BASE_HEX, NULL, CPFI_SOURCE_MASK,
 410         "Source TDA (10 bits)", HFILL}},
 411     { &hf_cpfi_dest,
 412       { "dstTDA", "cpfi.dstTDA",
 413         FT_UINT32, BASE_HEX, NULL, CPFI_DEST_MASK,
 414         "Source TDA (10 bits)", HFILL}},
 415     { &hf_cpfi_SOF_type,
 416       { "SOFtype", "cpfi.SOFtype",
 417         FT_UINT32, BASE_HEX, VALS(sof_type_vals), CPFI_SOF_TYPE_MASK,
 418         "SOF Type", HFILL}},
 419     { &hf_cpfi_speed,
 420       { "speed", "cpfi.speed",
 421         FT_UINT32, BASE_HEX, VALS(speed_vals), CPFI_SPEED_MASK,
 422         "SOF Type", HFILL}},
 423     { &hf_cpfi_OPM_error,
 424       { "OPMerror", "cpfi.OPMerror",
 425         FT_BOOLEAN, 32, NULL, CPFI_OPM_ERROR_MASK,
 426         "OPM Error?", HFILL}},
 427     { &hf_cpfi_from_LCM,
 428       { "fromLCM", "cpfi.fromLCM",
 429         FT_BOOLEAN, 32, NULL, CPFI_FROM_LCM_MASK,
 430         "from LCM?", HFILL}},
 431
 432     { &hf_cpfi_CRC_32,
 433       { "CRC-32", "cpfi.crc-32",
 434         FT_UINT32, BASE_HEX, NULL, 0x0,
 435         NULL, HFILL}},
 436
 437     { &hf_cpfi_EOF_type,
 438       { "EOFtype", "cpfi.EOFtype",
 439         FT_UINT32, BASE_HEX, VALS(eof_type_vals), CPFI_EOF_TYPE_MASK,
 440         "EOF Type", HFILL}},
 441
 442     { &hf_cpfi_t_instance,
 443       { "Instance", "cpfi.instance",
 444         FT_BYTES, BASE_NONE,
 445        NULL, 0x0, NULL, HFILL}},
 446
 447     { &hf_cpfi_t_src_instance,
 448       { "Source Instance", "cpfi.src_instance",
 449         FT_BYTES, BASE_NONE,
 450        NULL, 0x0, NULL, HFILL}},
 451
 452     { &hf_cpfi_t_dst_instance,
 453       { "Destination Instance", "cpfi.dst_instance",
 454         FT_BYTES, BASE_NONE,
 455        NULL, 0x0, NULL, HFILL}},
 456
 457     { &hf_cpfi_t_board,
 458       { "Board", "cpfi.board",
 459         FT_BYTES, BASE_NONE,
 460        NULL, 0x0, NULL, HFILL}},
 461
 462     { &hf_cpfi_t_src_board,
 463       { "Source Board", "cpfi.src_board",
 464         FT_BYTES, BASE_NONE,
 465        NULL, 0x0, NULL, HFILL}},
 466
 467     { &hf_cpfi_t_dst_board,
 468       { "Destination Board", "cpfi.dst_board",
 469         FT_BYTES, BASE_NONE,
 470        NULL, 0x0, NULL, HFILL}},
 471
 472     { &hf_cpfi_t_port,
 473       { "Port", "cpfi.port",
 474         FT_BYTES, BASE_NONE,
 475        NULL, 0x0, NULL, HFILL}},
 476
 477     { &hf_cpfi_t_src_port,
 478       { "Source Port", "cpfi.src_port",
 479         FT_BYTES, BASE_NONE,
 480        NULL, 0x0, NULL, HFILL}},
 481
 482     { &hf_cpfi_t_dst_port,
 483       { "Destination Port", "cpfi.dst_port",
 484         FT_BYTES, BASE_NONE,
 485        NULL, 0x0, NULL, HFILL}},
 486   };
 487
 488
 489   /* Setup protocol subtree array */
 490   static gint *ett[] = {
 491     &ett_cpfi,
 492     &ett_cpfi_header,
 493     &ett_cpfi_footer
 494   };
 495
 496
 497   /* Register the protocol name and description */
 498   proto_cpfi = proto_register_protocol("Cross Point Frame Injector", "CPFI",  "cpfi");
 499
 500   /* Required function calls to register the header fields and subtrees used */
 501   proto_register_field_array(proto_cpfi, hf, array_length(hf));
 502   proto_register_subtree_array(ett, array_length(ett));
 503
 504   /* Register our configuration options for CPFI */
 505   cpfi_module = prefs_register_protocol(proto_cpfi, proto_reg_handoff_cpfi);
 506   prefs_register_uint_preference(cpfi_module, "udp.port", "CPFI UDP Port",
 507                  "Set the port for CPFI messages (if other"
 508                  " than the default of 5000)",
 509                  10, &gbl_cpfi_udp_port);
 510   prefs_register_uint_preference(cpfi_module, "udp.port2", "InstanceToInstance UDP Port",
 511                  "Set the port for InstanceToInstance messages (if other"
 512                  " than the default of 5001)",
 513                  10, &gbl_cpfi_ttot_udp_port);
 514   prefs_register_bool_preference(cpfi_module, "arrow_ctl",
 515                 "Enable Active Arrow Control",
 516                 "Control the way the '-->' is displayed."
 517                 " When enabled, keeps the 'lowest valued' endpoint of the src-dest pair"
 518                 " on the left, and the arrow moves to distinguish source from dest."
 519                 " When disabled, keeps the arrow pointing right so the source of the frame"
 520                 " is always on the left.",
 521                 &cpfi_arrow_moves);
 522
 523 }
 524
 525 void
 526 proto_reg_handoff_cpfi(void)
 527 {
 528   static gboolean cpfi_init_complete = FALSE;
 529   static dissector_handle_t cpfi_handle;
 530   static dissector_handle_t ttot_handle;
 531   static guint cpfi_udp_port;
 532   static guint cpfi_ttot_udp_port;
 533
 534   if ( !cpfi_init_complete )
 535   {
 536     fc_handle     = find_dissector("fc");
 537     cpfi_handle   = new_create_dissector_handle(dissect_cpfi, proto_cpfi);
 538     ttot_handle   = new_create_dissector_handle(dissect_cpfi, proto_cpfi);
 539     cpfi_init_complete = TRUE;
 540   }
 541   else
 542   {
 543     dissector_delete_uint("udp.port", cpfi_udp_port, cpfi_handle);
 544     dissector_delete_uint("udp.port", cpfi_ttot_udp_port, ttot_handle);
 545   }
 546
 547   cpfi_udp_port      = gbl_cpfi_udp_port;
 548   cpfi_ttot_udp_port = gbl_cpfi_ttot_udp_port;
 549
 550   dissector_add_uint("udp.port", cpfi_udp_port, cpfi_handle);
 551   dissector_add_uint("udp.port", cpfi_ttot_udp_port, ttot_handle);
 552 }