/* packet-cpfi.c
 * Routines for CPFI Cross Point Frame Injector dissection
 * CPFI - Cross Point Frame Injector is a CNT proprietary
 * protocol used to carry Fibre Channel data over UDP
 *
 * Copyright 2003, Dave Sclarsky <dave_sclarsky[AT]cnt.com>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * Copied from packet-m2tp.c
 * Thanks to Heinz Prantner for his motivation and assistance
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/prefs.h>
#include "packet-fc.h"

void proto_register_cpfi(void);
void proto_reg_handoff_cpfi(void);

#define CPFI_DEFAULT_UDP_PORT      5000 /* Not IANA registered */
#define CPFI_DEFAULT_TTOT_UDP_PORT 5001 /* Not IANA registered */

#define FIRST_TIO_CARD_ADDRESS    0x380


/* SOF defines */
#define CPFI_FRAME_TYPE_MASK  0xF0000000
#define CPFI_FRAME_TYPE_SHIFT 28
#define CPFI_SOURCE_MASK      0x0FFC0000
#define CPFI_SOURCE_SHIFT     18
#define CPFI_DEST_MASK        0x0003FF00
#define CPFI_DEST_SHIFT       8
#define CPFI_SOF_TYPE_MASK    0x000000F0
#define CPFI_SPEED_MASK       0x0000000C
#define CPFI_OPM_ERROR_MASK   0x00000002
#define CPFI_FROM_LCM_MASK    0x00000001

/* EOF defines */
#define CPFI_EOF_TYPE_MASK    0x78000000
#define CPFI_EOF_ERROR_MASK   0x7FE00000

/* configurable parameters */
static guint gbl_cpfi_ttot_udp_port = CPFI_DEFAULT_TTOT_UDP_PORT;
static gboolean cpfi_arrow_moves    = TRUE;

/* Initialize the protocol and registered fields */
static int proto_cpfi = -1;
static int hf_cpfi_word_one = -1;
static int hf_cpfi_word_two = -1;
/* SOF word 1: */
static int hf_cpfi_frame_type = -1;
static int hf_cpfi_source = -1;
static int hf_cpfi_dest = -1;
static int hf_cpfi_SOF_type = -1;
static int hf_cpfi_speed = -1;
static int hf_cpfi_OPM_error = -1;
static int hf_cpfi_from_LCM = -1;
/* EOF */
static int hf_cpfi_CRC_32 = -1;
static int hf_cpfi_EOF_type = -1;
/* Hidden items */
static int hf_cpfi_t_instance = -1;
static int hf_cpfi_t_src_instance = -1;
static int hf_cpfi_t_dst_instance = -1;
static int hf_cpfi_t_board = -1;
static int hf_cpfi_t_src_board = -1;
static int hf_cpfi_t_dst_board = -1;
static int hf_cpfi_t_port = -1;
static int hf_cpfi_t_src_port = -1;
static int hf_cpfi_t_dst_port = -1;

static char src_str[20];
static char dst_str[20];
static const char l_to_r_arrow[] = "-->";
static const char r_to_l_arrow[] = "<--";
static const char *left  = src_str;
static const char *right = dst_str;
static const char *arrow = l_to_r_arrow;
static const char direction_and_port_string[] = "[%s %s %s] ";


/* Initialize the subtree pointers */
static gint ett_cpfi = -1;
static gint ett_cpfi_header = -1;
static gint ett_cpfi_footer = -1;

static dissector_handle_t fc_handle;


static const value_string sof_type_vals[] = {
    {0,     "SOFf"},
    {1,     "SOFi2"},
    {2,     "SOFn2"},
    {3,     "SOFi3"},
    {4,     "SOFn3"},
    {5,     "SOFc1"},
    {6,     "SOFi1"},
    {7,     "SOFn1"},
    {8,     "SOFc4"},
    {9,     "SOFi4"},
    {10,    "SOFn4"},
    {0, NULL},
};

static const value_string speed_vals[] = {
    {0,     "1 GBIT"},
    {1,     "2 GBIT"},
    {2,     "4 GBIT"},
    {3,     "10 GBIT"},
    {0, NULL},
};

static const value_string eof_type_vals[] = {
    {0,     "EOFn"},
    {1,     "EOFt"},
    {2,     "EOFni"},
    {3,     "EOFa"},
    {4,     "EOFdt"},
    {5,     "EOFdti"},
    {6,     "EOFrt"},
    {7,     "EOFrti"},
    {0, NULL},
};

/* Header */
static void
dissect_cpfi_header(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
  guint32     word1;
#if 0
  guint32     word2;
#endif
  guint32     tda;
  guint32     src;
  guint8      src_instance = 0;
  guint8      src_board    = 0;
  guint8      src_port     = 0;
  guint32     dst;
  guint8      dst_instance = 0;
  guint8      dst_board    = 0;
  guint8      dst_port     = 0;
  proto_tree *extra_tree   = NULL;

  /* add a tree for the header */
  if ( tree != NULL)
  {
    proto_item *extra_item;
    extra_item = proto_tree_add_protocol_format(tree, proto_cpfi, tvb, 0, -1, "Header");
    extra_tree = proto_item_add_subtree(extra_item, ett_cpfi_header);
  }

  /* Extract the common header, and get the bits we need */
  word1 = tvb_get_ntohl (tvb, 0);
#if 0
  word2 = tvb_get_ntohl (tvb, sizeof(word1));
#endif

  /* Figure out where the frame came from. dstTDA is source of frame! */
  tda = (word1 & CPFI_DEST_MASK) >> CPFI_DEST_SHIFT;
  if ( tda >= FIRST_TIO_CARD_ADDRESS )
  {
    (void) g_strlcpy(src_str, " CPFI", sizeof(src_str));
    src = 0;                            /* Make it smallest */
  }
  else
  {
    const guint8 *srcmac;

    /* Make sure this is an Ethernet address. */
    DISSECTOR_ASSERT(pinfo->src.type == AT_ETHER);
    srcmac = (const guint8 *)pinfo->src.data;

    src_instance = srcmac[2]-1;
    src_board = tda >> 4;
    src_port = tda & 0x0f;
    src = (1 << 24)  +  (src_instance << 16) + (src_board << 8) + src_port;
    snprintf(src_str, sizeof(src_str), "%u.%u.%u", src_instance, src_board, src_port);
  }

  /* Figure out where the frame is going. srcTDA is destination of frame! */
  tda = (word1 & CPFI_SOURCE_MASK) >> CPFI_SOURCE_SHIFT;
  if ( tda >= FIRST_TIO_CARD_ADDRESS )
  {
    (void) g_strlcpy(dst_str, " CPFI", sizeof(dst_str));
    dst = 0;                            /* Make it smallest */
  }
  else
  {
    const guint8 *dstmac;

    /* Make sure this is an Ethernet address. */
    DISSECTOR_ASSERT(pinfo->dst.type == AT_ETHER);
    dstmac = (const guint8 *)pinfo->dst.data;

    dst_instance = dstmac[2]-1;
    dst_board = tda >> 4;
    dst_port = tda & 0x0f;
    dst = (1 << 24)  +  (dst_instance << 16) + (dst_board << 8) + dst_port;
    snprintf(dst_str, sizeof(dst_str), "%u.%u.%u", dst_instance, dst_board, dst_port);
  }

  /* Set up the source and destination and arrow per user configuration. */
  if ( cpfi_arrow_moves  &&  (dst < src) )
  {
    left = dst_str;
    arrow = r_to_l_arrow;
    right = src_str;
  }
  else
  {
    left = src_str;
    arrow = l_to_r_arrow;
    right = dst_str;
  }

  if (extra_tree) {
    proto_item *hidden_item;
    /* For "real" TDAs (i.e. not for microTDAs), add hidden addresses to allow filtering */
    if ( src != 0 )
    {
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_instance, tvb, 0, 1, &src_instance);
      proto_item_set_hidden(hidden_item);
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_src_instance, tvb, 0, 1, &src_instance);
      proto_item_set_hidden(hidden_item);
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_board, tvb, 0, 1, &src_board);
      proto_item_set_hidden(hidden_item);
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_src_board, tvb, 0, 1, &src_board);
      proto_item_set_hidden(hidden_item);
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_port, tvb, 0, 1, &src_port);
      proto_item_set_hidden(hidden_item);
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_src_port, tvb, 0, 1, &src_port);
      proto_item_set_hidden(hidden_item);
    }
    if ( dst != 0 )
    {
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_instance, tvb, 0, 1, &dst_instance);
      proto_item_set_hidden(hidden_item);
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_dst_instance, tvb, 0, 1, &dst_instance);
      proto_item_set_hidden(hidden_item);
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_board, tvb, 0, 1, &dst_board);
      proto_item_set_hidden(hidden_item);
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_dst_board, tvb, 0, 1, &dst_board);
      proto_item_set_hidden(hidden_item);
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_port, tvb, 0, 1, &dst_port);
      proto_item_set_hidden(hidden_item);
      hidden_item = proto_tree_add_bytes(extra_tree, hf_cpfi_t_dst_port, tvb, 0, 1, &dst_port);
      proto_item_set_hidden(hidden_item);
    }

    /* add word 1 components to the protocol tree */
    proto_tree_add_item(extra_tree, hf_cpfi_word_one  , tvb, 0, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(extra_tree, hf_cpfi_frame_type, tvb, 0, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(extra_tree, hf_cpfi_source    , tvb, 0, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(extra_tree, hf_cpfi_dest      , tvb, 0, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(extra_tree, hf_cpfi_SOF_type  , tvb, 0, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(extra_tree, hf_cpfi_speed     , tvb, 0, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(extra_tree, hf_cpfi_OPM_error , tvb, 0, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(extra_tree, hf_cpfi_from_LCM  , tvb, 0, 4, ENC_BIG_ENDIAN);

    /* add word 2 components to the protocol tree */
    proto_tree_add_item(extra_tree, hf_cpfi_word_two  , tvb, 4, 4, ENC_BIG_ENDIAN);
  };
}

/* Footer */
static void
dissect_cpfi_footer(tvbuff_t *tvb, proto_tree *tree)
{
  proto_tree *extra_tree = NULL;

  /* add a tree for the footer */
  if ( tree != NULL)
  {
    proto_item *extra_item;
    extra_item = proto_tree_add_protocol_format(tree, proto_cpfi, tvb, 0, -1, "Footer");
    extra_tree = proto_item_add_subtree(extra_item, ett_cpfi_footer);
  }

  if (extra_tree) {
    proto_tree_add_item(extra_tree, hf_cpfi_CRC_32  , tvb, 0, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(extra_tree, hf_cpfi_EOF_type, tvb, 4, 4, ENC_BIG_ENDIAN);
  }
}

/* CPFI */
static int
dissect_cpfi(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
  tvbuff_t   *header_tvb, *body_tvb, *footer_tvb;
  proto_item *cpfi_item = NULL;
  proto_tree *cpfi_tree = NULL;
  gint        length, reported_length, body_length, reported_body_length;
  guint8      frame_type;
  fc_data_t fc_data;

  frame_type = (tvb_get_ntohl (message_tvb, 0) & CPFI_FRAME_TYPE_MASK) >> CPFI_FRAME_TYPE_SHIFT;

  /*  If this is not a CPFI frame, return 0 to let another dissector try to
   *  dissect it.
   */
  if ( !((frame_type == 9) && fc_handle) )
    return 0;

  /* If we don't have Ethernet addresses, can't do further dissection... */
  if (pinfo->dst.type != AT_ETHER || pinfo->src.type != AT_ETHER)
    return 0;

  length = tvb_captured_length_remaining(message_tvb, 8);
  reported_length = tvb_reported_length_remaining(message_tvb, 8);
  if (reported_length < 8)
  {
    /* We don't even have enough for the footer. */
    return 0;
  }

  /* Length of packet, minus the footer. */
  reported_body_length = reported_length - 8;
  /* How much of that do we have in the tvbuff? */
  body_length = length;
  if (body_length > reported_body_length)
    body_length = reported_body_length;

  length = tvb_captured_length_remaining(message_tvb, 8+body_length);
  if (length < 0)
  {
    /* The footer wasn't captured at all.
       XXX - we'd like to throw a BoundsError if that's the case. */
    return 0;
  }

  /* In the interest of speed, if "tree" is NULL, don't do any work not
     necessary to generate protocol tree items. */
  if (tree) {
    /* create the protocol tree */
    cpfi_item = proto_tree_add_item(tree, proto_cpfi, message_tvb, 0, -1, ENC_NA);
    cpfi_tree = proto_item_add_subtree(cpfi_item, ett_cpfi);
  }

  /* Set up the frame controls - can we do better than this? */
  fc_data.sof_eof = 0;
  fc_data.sof_eof |= FC_DATA_SOF_FIRST_FRAME;
  fc_data.sof_eof |= FC_DATA_EOF_LAST_FRAME;
  fc_data.sof_eof |= FC_DATA_EOF_INVALID;

  /* dissect the message */

  /* extract and process the header */
  header_tvb = tvb_new_subset_length(message_tvb, 0, 8);
  dissect_cpfi_header(header_tvb, pinfo, cpfi_tree);

  body_tvb = tvb_new_subset_length_caplen(message_tvb, 8, body_length, reported_body_length);
  fc_data.ethertype = ETHERTYPE_UNK;
  call_dissector_with_data(fc_handle, body_tvb, pinfo, tree, &fc_data);

  /* add more info, now that FC added its */
  proto_item_append_text(cpfi_item, direction_and_port_string, left, arrow, right);
  col_prepend_fstr(pinfo->cinfo, COL_INFO, direction_and_port_string, left, arrow, right);

  /* Do the footer */
  footer_tvb = tvb_new_subset_length_caplen(message_tvb, 8+body_length, length, 8);
  dissect_cpfi_footer(footer_tvb, cpfi_tree);

  return(tvb_reported_length(message_tvb));

}

/* Register the protocol with Wireshark */
void
proto_register_cpfi(void)
{
  module_t *cpfi_module;

  /* Setup list of header fields */
  static hf_register_info hf[] = {

    { &hf_cpfi_word_one,
      { "Word one", "cpfi.word_one",
        FT_UINT32, BASE_HEX, NULL, 0x0,
        NULL, HFILL}},
    { &hf_cpfi_word_two,
      { "Word two", "cpfi.word_two",
        FT_UINT32, BASE_HEX, NULL, 0x0,
        NULL, HFILL}},

    { &hf_cpfi_frame_type,
      { "FrmType", "cpfi.frmtype",
        FT_UINT32, BASE_HEX, NULL, CPFI_FRAME_TYPE_MASK,
        "Frame Type", HFILL}},
    { &hf_cpfi_source,
      { "srcTDA", "cpfi.srcTDA",
        FT_UINT32, BASE_HEX, NULL, CPFI_SOURCE_MASK,
        "Source TDA (10 bits)", HFILL}},
    { &hf_cpfi_dest,
      { "dstTDA", "cpfi.dstTDA",
        FT_UINT32, BASE_HEX, NULL, CPFI_DEST_MASK,
        "Source TDA (10 bits)", HFILL}},
    { &hf_cpfi_SOF_type,
      { "SOFtype", "cpfi.SOFtype",
        FT_UINT32, BASE_HEX, VALS(sof_type_vals), CPFI_SOF_TYPE_MASK,
        "SOF Type", HFILL}},
    { &hf_cpfi_speed,
      { "speed", "cpfi.speed",
        FT_UINT32, BASE_HEX, VALS(speed_vals), CPFI_SPEED_MASK,
        "SOF Type", HFILL}},
    { &hf_cpfi_OPM_error,
      { "OPMerror", "cpfi.OPMerror",
        FT_BOOLEAN, 32, NULL, CPFI_OPM_ERROR_MASK,
        "OPM Error?", HFILL}},
    { &hf_cpfi_from_LCM,
      { "fromLCM", "cpfi.fromLCM",
        FT_BOOLEAN, 32, NULL, CPFI_FROM_LCM_MASK,
        "from LCM?", HFILL}},

    { &hf_cpfi_CRC_32,
      { "CRC-32", "cpfi.crc-32",
        FT_UINT32, BASE_HEX, NULL, 0x0,
        NULL, HFILL}},

    { &hf_cpfi_EOF_type,
      { "EOFtype", "cpfi.EOFtype",
        FT_UINT32, BASE_HEX, VALS(eof_type_vals), CPFI_EOF_TYPE_MASK,
        "EOF Type", HFILL}},

    { &hf_cpfi_t_instance,
      { "Instance", "cpfi.instance",
        FT_BYTES, BASE_NONE,
       NULL, 0x0, NULL, HFILL}},

    { &hf_cpfi_t_src_instance,
      { "Source Instance", "cpfi.src_instance",
        FT_BYTES, BASE_NONE,
       NULL, 0x0, NULL, HFILL}},

    { &hf_cpfi_t_dst_instance,
      { "Destination Instance", "cpfi.dst_instance",
        FT_BYTES, BASE_NONE,
       NULL, 0x0, NULL, HFILL}},

    { &hf_cpfi_t_board,
      { "Board", "cpfi.board",
        FT_BYTES, BASE_NONE,
       NULL, 0x0, NULL, HFILL}},

    { &hf_cpfi_t_src_board,
      { "Source Board", "cpfi.src_board",
        FT_BYTES, BASE_NONE,
       NULL, 0x0, NULL, HFILL}},

    { &hf_cpfi_t_dst_board,
      { "Destination Board", "cpfi.dst_board",
        FT_BYTES, BASE_NONE,
       NULL, 0x0, NULL, HFILL}},

    { &hf_cpfi_t_port,
      { "Port", "cpfi.port",
        FT_BYTES, BASE_NONE,
       NULL, 0x0, NULL, HFILL}},

    { &hf_cpfi_t_src_port,
      { "Source Port", "cpfi.src_port",
        FT_BYTES, BASE_NONE,
       NULL, 0x0, NULL, HFILL}},

    { &hf_cpfi_t_dst_port,
      { "Destination Port", "cpfi.dst_port",
        FT_BYTES, BASE_NONE,
       NULL, 0x0, NULL, HFILL}},
  };


  /* Setup protocol subtree array */
  static gint *ett[] = {
    &ett_cpfi,
    &ett_cpfi_header,
    &ett_cpfi_footer
  };


  /* Register the protocol name and description */
  proto_cpfi = proto_register_protocol("Cross Point Frame Injector", "CPFI",  "cpfi");

  /* Required function calls to register the header fields and subtrees used */
  proto_register_field_array(proto_cpfi, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));

  /* Register our configuration options for CPFI */
  cpfi_module = prefs_register_protocol(proto_cpfi, proto_reg_handoff_cpfi);
  prefs_register_uint_preference(cpfi_module, "udp.port2", "InstanceToInstance UDP Port",
                 "Set the port for InstanceToInstance messages (if other"
                 " than the default of 5001)",
                 10, &gbl_cpfi_ttot_udp_port);
  prefs_register_bool_preference(cpfi_module, "arrow_ctl",
                "Enable Active Arrow Control",
                "Control the way the '-->' is displayed."
                " When enabled, keeps the 'lowest valued' endpoint of the src-dest pair"
                " on the left, and the arrow moves to distinguish source from dest."
                " When disabled, keeps the arrow pointing right so the source of the frame"
                " is always on the left.",
                &cpfi_arrow_moves);

}

void
proto_reg_handoff_cpfi(void)
{
  static gboolean cpfi_init_complete = FALSE;
  static dissector_handle_t cpfi_handle;
  static guint cpfi_ttot_udp_port;

  if ( !cpfi_init_complete )
  {
    fc_handle     = find_dissector_add_dependency("fc", proto_cpfi);
    cpfi_handle   = create_dissector_handle(dissect_cpfi, proto_cpfi);
    dissector_add_uint_with_preference("udp.port", CPFI_DEFAULT_UDP_PORT, cpfi_handle);
    cpfi_init_complete = TRUE;
  }
  else
  {
    dissector_delete_uint("udp.port", cpfi_ttot_udp_port, cpfi_handle);
  }

  cpfi_ttot_udp_port = gbl_cpfi_ttot_udp_port;

  /* Port preference has a specific enough name to not use
     the "auto" preference */
  dissector_add_uint("udp.port", cpfi_ttot_udp_port, cpfi_handle);
}

/*
 * Editor modelines
 *
 * Local Variables:
 * c-basic-offset: 2
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * ex: set shiftwidth=2 tabstop=8 expandtab:
 * :indentSize=2:tabSize=8:noTabs=true:
 */
