Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 560 insertions, 0 deletions

diff --git a/epan/dissectors/packet-fddi.c b/epan/dissectors/packet-fddi.c
new file mode 100644
index 00000000..8fec7936
--- /dev/null
+++ b/epan/dissectors/packet-fddi.c
@@ -0,0 +1,560 @@
+/* packet-fddi.c
+ * Routines for FDDI packet disassembly
+ *
+ * ANSI Standard X3T9.5/88-139, Rev 4.0
+ *
+ * ISO Standards 9314-N (N = 1 for PHY, N = 2 for MAC, N = 6 for SMT, etc.)
+ *
+ * Laurent Deniel <laurent.deniel@free.fr>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <wsutil/bitswap.h>
+#include <epan/prefs.h>
+#include <epan/conversation_table.h>
+#include <epan/capture_dissectors.h>
+#include "packet-llc.h"
+#include "packet-sflow.h"
+
+#include <epan/addr_resolv.h>
+
+void proto_register_fddi(void);
+void proto_reg_handoff_fddi(void);
+
+static int proto_fddi = -1;
+static int hf_fddi_fc = -1;
+static int hf_fddi_fc_clf = -1;
+static int hf_fddi_fc_prio = -1;
+static int hf_fddi_fc_smt_subtype = -1;
+static int hf_fddi_fc_mac_subtype = -1;
+static int hf_fddi_dst = -1;
+static int hf_fddi_src = -1;
+static int hf_fddi_addr = -1;
+
+static gint ett_fddi = -1;
+static gint ett_fddi_fc = -1;
+
+static int fddi_tap = -1;
+
+static dissector_handle_t fddi_handle, fddi_bitswapped_handle;
+
+static capture_dissector_handle_t llc_cap_handle;
+
+static gboolean fddi_padding = FALSE;
+
+#define FDDI_PADDING            ((fddi_padding) ? 3 : 0)
+
+/* FDDI Frame Control values */
+
+#define FDDI_FC_VOID            0x00            /* Void frame */
+#define FDDI_FC_NRT             0x80            /* Nonrestricted token */
+#define FDDI_FC_RT              0xc0            /* Restricted token */
+#define FDDI_FC_MAC             0xc0            /* MAC frame */
+#define FDDI_FC_SMT             0x40            /* SMT frame */
+#define FDDI_FC_SMT_INFO        0x41            /* SMT Info */
+#define FDDI_FC_SMT_NSA         0x4F            /* SMT Next station adrs */
+#define FDDI_FC_SMT_MIN         FDDI_FC_SMT_INFO
+#define FDDI_FC_SMT_MAX         FDDI_FC_SMT_NSA
+#define FDDI_FC_MAC_MIN         0xc1
+#define FDDI_FC_MAC_BEACON      0xc2            /* MAC Beacon frame */
+#define FDDI_FC_MAC_CLAIM       0xc3            /* MAC Claim frame */
+#define FDDI_FC_MAC_MAX         0xcf
+#define FDDI_FC_LLC_ASYNC       0x50            /* Async. LLC frame */
+#define FDDI_FC_LLC_ASYNC_MIN   FDDI_FC_LLC_ASYNC
+#define FDDI_FC_LLC_ASYNC_DEF   0x54
+#define FDDI_FC_LLC_ASYNC_MAX   0x5f
+#define FDDI_FC_LLC_SYNC        0xd0            /* Sync. LLC frame */
+#define FDDI_FC_LLC_SYNC_MIN    FDDI_FC_LLC_SYNC
+#define FDDI_FC_LLC_SYNC_MAX    0xd7
+#define FDDI_FC_IMP_ASYNC       0x60            /* Implementor Async. */
+#define FDDI_FC_IMP_ASYNC_MIN   FDDI_FC_IMP_ASYNC
+#define FDDI_FC_IMP_ASYNC_MAX   0x6f
+#define FDDI_FC_IMP_SYNC        0xe0            /* Implementor Synch. */
+
+#define FDDI_FC_CLFF            0xF0            /* Class/Length/Format bits */
+#define FDDI_FC_ZZZZ            0x0F            /* Control bits */
+
+/*
+ * Async frame ZZZZ bits:
+ */
+#define FDDI_FC_ASYNC_R         0x08            /* Reserved */
+#define FDDI_FC_ASYNC_PRI       0x07            /* Priority */
+
+#define CLFF_BITS(fc)   (((fc) & FDDI_FC_CLFF) >> 4)
+#define ZZZZ_BITS(fc)   ((fc) & FDDI_FC_ZZZZ)
+
+static const value_string clf_vals[] = {
+  { CLFF_BITS(FDDI_FC_VOID),      "Void" },
+  { CLFF_BITS(FDDI_FC_SMT),       "SMT" },
+  { CLFF_BITS(FDDI_FC_LLC_ASYNC), "Async LLC" },
+  { CLFF_BITS(FDDI_FC_IMP_ASYNC), "Implementor Async" },
+  { CLFF_BITS(FDDI_FC_NRT),       "Nonrestricted Token" },
+  { CLFF_BITS(FDDI_FC_MAC),       "MAC" },
+  { CLFF_BITS(FDDI_FC_LLC_SYNC),  "Sync LLC" },
+  { CLFF_BITS(FDDI_FC_IMP_SYNC),  "Implementor Sync" },
+  { 0,                            NULL }
+};
+
+static const value_string smt_subtype_vals[] = {
+  { ZZZZ_BITS(FDDI_FC_SMT_INFO), "Info" },
+  { ZZZZ_BITS(FDDI_FC_SMT_NSA),  "Next Station Address" },
+  { 0,                           NULL }
+};
+
+static const value_string mac_subtype_vals[] = {
+  { ZZZZ_BITS(FDDI_FC_MAC_BEACON), "Beacon" },
+  { ZZZZ_BITS(FDDI_FC_MAC_CLAIM),  "Claim" },
+  { 0,                             NULL }
+};
+
+typedef struct _fddi_hdr {
+  guint8  fc;
+  address dst;
+  address src;
+} fddi_hdr;
+
+#define FDDI_HEADER_SIZE       13
+
+/* field positions */
+
+#define FDDI_P_FC               0
+#define FDDI_P_DHOST            1
+#define FDDI_P_SHOST            7
+
+static dissector_handle_t llc_handle;
+
+static void
+swap_mac_addr(guint8 *swapped_addr, tvbuff_t *tvb, gint offset)
+{
+  tvb_memcpy(tvb, swapped_addr, offset, 6);
+  bitswap_buf_inplace(swapped_addr, 6);
+}
+
+static const char* fddi_conv_get_filter_type(conv_item_t* conv, conv_filter_type_e filter)
+{
+  if ((filter == CONV_FT_SRC_ADDRESS) && (conv->src_address.type == AT_ETHER))
+    return "fddi.src";
+
+  if ((filter == CONV_FT_DST_ADDRESS) && (conv->dst_address.type == AT_ETHER))
+    return "fddi.dst";
+
+  if ((filter == CONV_FT_ANY_ADDRESS) && (conv->src_address.type == AT_ETHER))
+    return "fddi.addr";
+
+  return CONV_FILTER_INVALID;
+}
+
+static ct_dissector_info_t fddi_ct_dissector_info = {&fddi_conv_get_filter_type};
+
+static tap_packet_status
+fddi_conversation_packet(void *pct, packet_info *pinfo, epan_dissect_t *edt _U_, const void *vip, tap_flags_t flags)
+{
+  conv_hash_t *hash = (conv_hash_t*) pct;
+  hash->flags = flags;
+  const fddi_hdr *ehdr=(const fddi_hdr *)vip;
+
+  add_conversation_table_data(hash, &ehdr->src, &ehdr->dst, 0, 0, 1, pinfo->fd->pkt_len, &pinfo->rel_ts, &pinfo->abs_ts, &fddi_ct_dissector_info, CONVERSATION_NONE);
+
+  return TAP_PACKET_REDRAW;
+}
+
+static const char* fddi_endpoint_get_filter_type(endpoint_item_t* endpoint, conv_filter_type_e filter)
+{
+  if ((filter == CONV_FT_ANY_ADDRESS) && (endpoint->myaddress.type == AT_ETHER))
+    return "fddi.addr";
+
+  return CONV_FILTER_INVALID;
+}
+
+static et_dissector_info_t fddi_endpoint_dissector_info = {&fddi_endpoint_get_filter_type};
+
+static tap_packet_status
+fddi_endpoint_packet(void *pit, packet_info *pinfo, epan_dissect_t *edt _U_, const void *vip, tap_flags_t flags)
+{
+  conv_hash_t *hash = (conv_hash_t*) pit;
+  hash->flags = flags;
+  const fddi_hdr *ehdr=(const fddi_hdr *)vip;
+
+  /* Take two "add" passes per packet, adding for each direction, ensures that all
+  packets are counted properly (even if address is sending to itself)
+  XXX - this could probably be done more efficiently inside endpoint_table */
+  add_endpoint_table_data(hash, &ehdr->src, 0, TRUE, 1, pinfo->fd->pkt_len, &fddi_endpoint_dissector_info, ENDPOINT_NONE);
+  add_endpoint_table_data(hash, &ehdr->dst, 0, FALSE, 1, pinfo->fd->pkt_len, &fddi_endpoint_dissector_info, ENDPOINT_NONE);
+
+  return TAP_PACKET_REDRAW;
+}
+
+static gboolean
+capture_fddi(const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header)
+{
+  int fc;
+
+  if (!BYTES_ARE_IN_FRAME(0, len, FDDI_HEADER_SIZE + FDDI_PADDING))
+    return FALSE;
+
+  offset = FDDI_PADDING + FDDI_HEADER_SIZE;
+
+  fc = (int) pd[FDDI_P_FC+FDDI_PADDING];
+
+  switch (fc) {
+
+    /* From now, only 802.2 SNAP (Async. LCC frame) is supported */
+
+    case FDDI_FC_LLC_ASYNC + 0  :
+    case FDDI_FC_LLC_ASYNC + 1  :
+    case FDDI_FC_LLC_ASYNC + 2  :
+    case FDDI_FC_LLC_ASYNC + 3  :
+    case FDDI_FC_LLC_ASYNC + 4  :
+    case FDDI_FC_LLC_ASYNC + 5  :
+    case FDDI_FC_LLC_ASYNC + 6  :
+    case FDDI_FC_LLC_ASYNC + 7  :
+    case FDDI_FC_LLC_ASYNC + 8  :
+    case FDDI_FC_LLC_ASYNC + 9  :
+    case FDDI_FC_LLC_ASYNC + 10 :
+    case FDDI_FC_LLC_ASYNC + 11 :
+    case FDDI_FC_LLC_ASYNC + 12 :
+    case FDDI_FC_LLC_ASYNC + 13 :
+    case FDDI_FC_LLC_ASYNC + 14 :
+    case FDDI_FC_LLC_ASYNC + 15 :
+      return call_capture_dissector(llc_cap_handle, pd, offset, len, cpinfo, pseudo_header);
+  } /* fc */
+
+  return FALSE;
+} /* capture_fddi */
+
+static const gchar *
+fddifc_to_str(int fc)
+{
+  static gchar strbuf[128+1];
+
+  switch (fc) {
+
+  case FDDI_FC_VOID:                    /* Void frame */
+    return "Void frame";
+
+  case FDDI_FC_NRT:                     /* Nonrestricted token */
+    return "Nonrestricted token";
+
+  case FDDI_FC_RT:                      /* Restricted token */
+    return "Restricted token";
+
+  case FDDI_FC_SMT_INFO:                /* SMT Info */
+    return "SMT info";
+
+  case FDDI_FC_SMT_NSA:                 /* SMT Next station adrs */
+    return "SMT Next station address";
+
+  case FDDI_FC_MAC_BEACON:              /* MAC Beacon frame */
+    return "MAC beacon";
+
+  case FDDI_FC_MAC_CLAIM:               /* MAC Claim frame */
+    return "MAC claim token";
+
+  default:
+    switch (fc & FDDI_FC_CLFF) {
+
+    case FDDI_FC_MAC:
+      snprintf(strbuf, sizeof(strbuf), "MAC frame, control %x", fc & FDDI_FC_ZZZZ);
+      return strbuf;
+
+    case FDDI_FC_SMT:
+      snprintf(strbuf, sizeof(strbuf), "SMT frame, control %x", fc & FDDI_FC_ZZZZ);
+      return strbuf;
+
+    case FDDI_FC_LLC_ASYNC:
+      if (fc & FDDI_FC_ASYNC_R)
+        snprintf(strbuf, sizeof(strbuf), "Async LLC frame, control %x", fc & FDDI_FC_ZZZZ);
+      else
+        snprintf(strbuf, sizeof(strbuf), "Async LLC frame, priority %d",
+                        fc & FDDI_FC_ASYNC_PRI);
+      return strbuf;
+
+    case FDDI_FC_LLC_SYNC:
+      if (fc & FDDI_FC_ZZZZ) {
+        snprintf(strbuf, sizeof(strbuf), "Sync LLC frame, control %x", fc & FDDI_FC_ZZZZ);
+        return strbuf;
+      } else
+        return "Sync LLC frame";
+
+    case FDDI_FC_IMP_ASYNC:
+      snprintf(strbuf, sizeof(strbuf), "Implementor async frame, control %x",
+                        fc & FDDI_FC_ZZZZ);
+      return strbuf;
+
+    case FDDI_FC_IMP_SYNC:
+      snprintf(strbuf, sizeof(strbuf), "Implementor sync frame, control %x",
+                        fc & FDDI_FC_ZZZZ);
+      return strbuf;
+
+    default:
+      return "Unknown frame type";
+    }
+  }
+}
+
+
+static void
+dissect_fddi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
+             gboolean bitswapped)
+{
+  proto_tree      *fh_tree     = NULL;
+  proto_item      *ti, *hidden_item;
+  const gchar     *fc_str;
+  proto_tree      *fc_tree;
+  guchar          *src = (guchar*)wmem_alloc(pinfo->pool, 6), *dst = (guchar*)wmem_alloc(pinfo->pool, 6);
+  guchar           src_swapped[6], dst_swapped[6];
+  tvbuff_t        *next_tvb;
+  static fddi_hdr  fddihdrs[4];
+  static int       fddihdr_num = 0;
+  fddi_hdr        *fddihdr;
+
+  fddihdr_num++;
+  if (fddihdr_num >= 4) {
+     fddihdr_num = 0;
+  }
+  fddihdr = &fddihdrs[fddihdr_num];
+
+  col_set_str(pinfo->cinfo, COL_PROTOCOL, "FDDI");
+
+  fddihdr->fc = tvb_get_guint8(tvb, FDDI_P_FC + FDDI_PADDING);
+  fc_str = fddifc_to_str(fddihdr->fc);
+
+  col_add_str(pinfo->cinfo, COL_INFO, fc_str);
+
+  if (tree) {
+    ti = proto_tree_add_protocol_format(tree, proto_fddi, tvb, 0, FDDI_HEADER_SIZE+FDDI_PADDING,
+                                        "Fiber Distributed Data Interface, %s", fc_str);
+    fh_tree = proto_item_add_subtree(ti, ett_fddi);
+    ti = proto_tree_add_uint_format_value(fh_tree, hf_fddi_fc, tvb, FDDI_P_FC + FDDI_PADDING, 1, fddihdr->fc,
+        "0x%02x (%s)", fddihdr->fc, fc_str);
+    fc_tree = proto_item_add_subtree(ti, ett_fddi_fc);
+    proto_tree_add_uint(fc_tree, hf_fddi_fc_clf, tvb, FDDI_P_FC + FDDI_PADDING, 1, fddihdr->fc);
+    switch ((fddihdr->fc) & FDDI_FC_CLFF) {
+
+    case FDDI_FC_SMT:
+      proto_tree_add_uint(fc_tree, hf_fddi_fc_smt_subtype, tvb, FDDI_P_FC + FDDI_PADDING, 1, fddihdr->fc);
+      break;
+
+    case FDDI_FC_MAC:
+      if (fddihdr->fc != FDDI_FC_RT)
+        proto_tree_add_uint(fc_tree, hf_fddi_fc_mac_subtype, tvb, FDDI_P_FC + FDDI_PADDING, 1, fddihdr->fc);
+      break;
+
+    case FDDI_FC_LLC_ASYNC:
+      if (!((fddihdr->fc) & FDDI_FC_ASYNC_R))
+        proto_tree_add_uint(fc_tree, hf_fddi_fc_prio, tvb, FDDI_P_FC + FDDI_PADDING, 1, fddihdr->fc);
+      break;
+    }
+  }
+
+  /* Extract the destination address, possibly bit-swapping it. */
+  if (bitswapped)
+    swap_mac_addr(dst, tvb, FDDI_P_DHOST + FDDI_PADDING);
+  else
+    tvb_memcpy(tvb, dst, FDDI_P_DHOST + FDDI_PADDING, 6);
+  swap_mac_addr(dst_swapped, tvb, FDDI_P_DHOST + FDDI_PADDING);
+
+  set_address(&pinfo->dl_dst, AT_ETHER, 6, dst);
+  copy_address_shallow(&pinfo->dst, &pinfo->dl_dst);
+  copy_address_shallow(&fddihdr->dst, &pinfo->dl_dst);
+
+  if (fh_tree) {
+    proto_tree_add_ether(fh_tree, hf_fddi_dst, tvb, FDDI_P_DHOST + FDDI_PADDING, 6, dst);
+    hidden_item = proto_tree_add_ether(fh_tree, hf_fddi_addr, tvb, FDDI_P_DHOST + FDDI_PADDING, 6, dst);
+    proto_item_set_hidden(hidden_item);
+
+    /* hide some bit-swapped mac address fields in the proto_tree, just in case */
+    hidden_item = proto_tree_add_ether(fh_tree, hf_fddi_dst, tvb, FDDI_P_DHOST + FDDI_PADDING, 6, dst_swapped);
+    proto_item_set_hidden(hidden_item);
+    hidden_item = proto_tree_add_ether(fh_tree, hf_fddi_addr, tvb, FDDI_P_DHOST + FDDI_PADDING, 6, dst_swapped);
+    proto_item_set_hidden(hidden_item);
+  }
+
+  /* Extract the source address, possibly bit-swapping it. */
+  if (bitswapped)
+    swap_mac_addr(src, tvb, FDDI_P_SHOST + FDDI_PADDING);
+  else
+    tvb_memcpy(tvb, src, FDDI_P_SHOST + FDDI_PADDING, 6);
+  swap_mac_addr(src_swapped, tvb, FDDI_P_SHOST + FDDI_PADDING);
+
+  set_address(&pinfo->dl_src, AT_ETHER, 6, src);
+  copy_address_shallow(&pinfo->src, &pinfo->dl_src);
+  copy_address_shallow(&fddihdr->src, &pinfo->dl_src);
+
+  if (fh_tree) {
+    proto_tree_add_ether(fh_tree, hf_fddi_src, tvb, FDDI_P_SHOST + FDDI_PADDING, 6, src);
+    hidden_item = proto_tree_add_ether(fh_tree, hf_fddi_addr, tvb, FDDI_P_SHOST + FDDI_PADDING, 6, src);
+    proto_item_set_hidden(hidden_item);
+
+    /* hide some bit-swapped mac address fields in the proto_tree, just in case */
+    hidden_item = proto_tree_add_ether(fh_tree, hf_fddi_src, tvb, FDDI_P_SHOST + FDDI_PADDING, 6, src_swapped);
+    proto_item_set_hidden(hidden_item);
+    hidden_item = proto_tree_add_ether(fh_tree, hf_fddi_addr, tvb, FDDI_P_SHOST + FDDI_PADDING, 6, src_swapped);
+    proto_item_set_hidden(hidden_item);
+  }
+
+  next_tvb = tvb_new_subset_remaining(tvb, FDDI_HEADER_SIZE + FDDI_PADDING);
+
+
+  tap_queue_packet(fddi_tap, pinfo, fddihdr);
+
+  switch (fddihdr->fc) {
+
+    /* From now, only 802.2 SNAP (Async. LCC frame) is supported */
+
+    case FDDI_FC_LLC_ASYNC + 0  :
+    case FDDI_FC_LLC_ASYNC + 1  :
+    case FDDI_FC_LLC_ASYNC + 2  :
+    case FDDI_FC_LLC_ASYNC + 3  :
+    case FDDI_FC_LLC_ASYNC + 4  :
+    case FDDI_FC_LLC_ASYNC + 5  :
+    case FDDI_FC_LLC_ASYNC + 6  :
+    case FDDI_FC_LLC_ASYNC + 7  :
+    case FDDI_FC_LLC_ASYNC + 8  :
+    case FDDI_FC_LLC_ASYNC + 9  :
+    case FDDI_FC_LLC_ASYNC + 10 :
+    case FDDI_FC_LLC_ASYNC + 11 :
+    case FDDI_FC_LLC_ASYNC + 12 :
+    case FDDI_FC_LLC_ASYNC + 13 :
+    case FDDI_FC_LLC_ASYNC + 14 :
+    case FDDI_FC_LLC_ASYNC + 15 :
+      call_dissector(llc_handle, next_tvb, pinfo, tree);
+      return;
+
+    default :
+      call_data_dissector(next_tvb, pinfo, tree);
+      return;
+
+  } /* fc */
+} /* dissect_fddi */
+
+
+static int
+dissect_fddi_bitswapped(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+  dissect_fddi(tvb, pinfo, tree, TRUE);
+  return tvb_captured_length(tvb);
+}
+
+static int
+dissect_fddi_not_bitswapped(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+  dissect_fddi(tvb, pinfo, tree, FALSE);
+  return tvb_captured_length(tvb);
+}
+
+void
+proto_register_fddi(void)
+{
+  static hf_register_info hf[] = {
+
+    { &hf_fddi_fc,
+      { "Frame Control", "fddi.fc", FT_UINT8, BASE_HEX, NULL, 0x0,
+        NULL, HFILL }},
+
+    { &hf_fddi_fc_clf,
+      { "Class/Length/Format", "fddi.fc.clf", FT_UINT8, BASE_HEX, VALS(clf_vals), FDDI_FC_CLFF,
+        NULL, HFILL }},
+
+    { &hf_fddi_fc_prio,
+      { "Priority", "fddi.fc.prio", FT_UINT8, BASE_DEC, NULL, FDDI_FC_ASYNC_PRI,
+        NULL, HFILL }},
+
+    { &hf_fddi_fc_smt_subtype,
+      { "SMT Subtype", "fddi.fc.smt_subtype", FT_UINT8, BASE_DEC, VALS(smt_subtype_vals), FDDI_FC_ZZZZ,
+        NULL, HFILL }},
+
+    { &hf_fddi_fc_mac_subtype,
+      { "MAC Subtype", "fddi.fc.mac_subtype", FT_UINT8, BASE_DEC, VALS(mac_subtype_vals), FDDI_FC_ZZZZ,
+        NULL, HFILL }},
+
+    { &hf_fddi_dst,
+      { "Destination", "fddi.dst", FT_ETHER, BASE_NONE, NULL, 0x0,
+        "Destination Hardware Address", HFILL }},
+
+    { &hf_fddi_src,
+      { "Source", "fddi.src", FT_ETHER, BASE_NONE, NULL, 0x0,
+        NULL, HFILL }},
+
+    { &hf_fddi_addr,
+      { "Source or Destination Address", "fddi.addr", FT_ETHER, BASE_NONE, NULL, 0x0,
+        "Source or Destination Hardware Address", HFILL }},
+
+  };
+  static gint *ett[] = {
+    &ett_fddi,
+    &ett_fddi_fc,
+  };
+
+  module_t *fddi_module;
+
+  proto_fddi = proto_register_protocol("Fiber Distributed Data Interface",
+                                       "FDDI", "fddi");
+  proto_register_field_array(proto_fddi, hf, array_length(hf));
+  proto_register_subtree_array(ett, array_length(ett));
+
+  /*
+   * Called from various dissectors for encapsulated FDDI frames.
+   * We assume the MAC addresses in them aren't bitswapped.
+   */
+  fddi_handle = register_dissector("fddi", dissect_fddi_not_bitswapped, proto_fddi);
+
+  /*
+   * Here, we assume they are bitswapped.
+   */
+  fddi_bitswapped_handle = register_dissector("fddi_bitswapped", dissect_fddi_bitswapped, proto_fddi);
+
+  fddi_module = prefs_register_protocol(proto_fddi, NULL);
+  prefs_register_bool_preference(fddi_module, "padding",
+                                 "Add 3-byte padding to all FDDI packets",
+                                 "Whether the FDDI dissector should add 3-byte padding to all "
+                                 "captured FDDI packets (useful with e.g. Tru64 UNIX tcpdump)",
+                                 &fddi_padding);
+
+  fddi_tap = register_tap("fddi");
+  register_conversation_table(proto_fddi, TRUE, fddi_conversation_packet, fddi_endpoint_packet);
+}
+
+void
+proto_reg_handoff_fddi(void)
+{
+  capture_dissector_handle_t fddi_cap_handle;
+
+  /*
+   * Get a handle for the LLC dissector.
+   */
+  llc_handle = find_dissector_add_dependency("llc", proto_fddi);
+
+  dissector_add_uint("wtap_encap", WTAP_ENCAP_FDDI, fddi_handle);
+  dissector_add_uint("wtap_encap", WTAP_ENCAP_FDDI_BITSWAPPED,
+                     fddi_bitswapped_handle);
+  dissector_add_uint("sflow_245.header_protocol", SFLOW_245_HEADER_FDDI,
+                     fddi_handle);
+
+  fddi_cap_handle = create_capture_dissector_handle(capture_fddi, proto_fddi);
+  capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_FDDI, fddi_cap_handle);
+  capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_FDDI_BITSWAPPED, fddi_cap_handle);
+
+  llc_cap_handle = find_capture_dissector("llc");
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * 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:
+ */