e1d9a226a2
The static arrays are supposed to be arrays of const pointers to int, not arrays of non-const pointers to const int. Fixing that means some bugs (scribbling on what's *supposed* to be a const array) will be caught (see packet-ieee80211-radiotap.c for examples, the first of which inspired this change and the second of which was discovered while testing compiles with this change), and removes the need for some annoying casts. Also make some of those arrays static while we're at it. Update documentation and dissector-generator tools. Change-Id: I789da5fc60aadc15797cefecfd9a9fbe9a130ccc Reviewed-on: https://code.wireshark.org/review/37517 Petri-Dish: Guy Harris <gharris@sonic.net> Tested-by: Petri Dish Buildbot Reviewed-by: Anders Broman <a.broman58@gmail.com>
248 lines
7 KiB
C
248 lines
7 KiB
C
/* packet-mpls-mac.c
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*
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* Routines for MPLS Media Access Control (MAC) Address Withdrawal over Static Pseudowire.
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include "packet-mpls.h"
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void proto_register_mpls_mac(void);
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void proto_reg_handoff_mpls_mac(void);
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static gint proto_mpls_mac = -1;
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static gint ett_mpls_mac = -1;
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static gint ett_mpls_mac_flags = -1;
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static gint ett_mpls_mac_tlv = -1;
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static int hf_mpls_mac_reserved = -1;
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static int hf_mpls_mac_tlv_length_total = -1;
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static int hf_mpls_mac_flags = -1;
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static int hf_mpls_mac_flags_a = -1;
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static int hf_mpls_mac_flags_r = -1;
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static int hf_mpls_mac_flags_reserved = -1;
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static int hf_mpls_mac_tlv = -1;
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static int hf_mpls_mac_tlv_res = -1;
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static int hf_mpls_mac_tlv_type = -1;
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static int hf_mpls_mac_tlv_length = -1;
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static int hf_mpls_mac_tlv_value = -1;
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static int hf_mpls_mac_tlv_sequence_number = -1;
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static int * const mpls_mac_flags[] = {
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&hf_mpls_mac_flags_a,
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&hf_mpls_mac_flags_r,
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&hf_mpls_mac_flags_reserved,
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NULL
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};
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static int
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dissect_mpls_mac(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *ti;
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proto_tree *mac_tree;
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guint32 offset = 0, tlv_length, offset_end;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MPLS-MAC");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_mpls_mac, tvb, 0, -1, ENC_NA);
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mac_tree = proto_item_add_subtree(ti, ett_mpls_mac);
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/* Reserved */
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proto_tree_add_item(mac_tree, hf_mpls_mac_reserved, tvb, offset, 2, ENC_NA);
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offset += 2;
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/* TLV length */
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proto_tree_add_item_ret_uint(mac_tree, hf_mpls_mac_tlv_length_total, tvb, offset, 1, ENC_BIG_ENDIAN, &tlv_length);
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offset += 1;
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/* Flags */
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proto_tree_add_bitmask(mac_tree, tvb, offset, hf_mpls_mac_flags,
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ett_mpls_mac_flags,
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mpls_mac_flags,
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ENC_BIG_ENDIAN);
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offset += 1;
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offset_end = offset + tlv_length;
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while(offset < offset_end){
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guint32 type, length;
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proto_tree *tlv_tree;
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ti = proto_tree_add_item(mac_tree, hf_mpls_mac_tlv, tvb, offset, 4, ENC_NA);
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tlv_tree = proto_item_add_subtree(ti, ett_mpls_mac_tlv);
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/* res(erved) */
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proto_tree_add_item(tlv_tree, hf_mpls_mac_tlv_res, tvb, offset, 2, ENC_BIG_ENDIAN);
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/* TLV Type */
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proto_tree_add_item_ret_uint(tlv_tree, hf_mpls_mac_tlv_type, tvb, offset, 2, ENC_BIG_ENDIAN, &type);
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offset += 2;
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/* TLV Length */
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proto_tree_add_item_ret_uint(tlv_tree, hf_mpls_mac_tlv_length, tvb, offset, 2, ENC_BIG_ENDIAN, &length);
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offset += 2;
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proto_item_set_len(ti, 2+2+length);
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proto_item_append_text(ti, " (t=0x%x, l=%u)", type, length);
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/* TLV Value */
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proto_tree_add_item(tlv_tree, hf_mpls_mac_tlv_value, tvb, offset, length, ENC_NA);
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switch(type){
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case 0x0001:
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proto_tree_add_item(tlv_tree, hf_mpls_mac_tlv_sequence_number, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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break;
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default:
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offset += length;
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break;
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}
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}
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return offset;
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}
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void
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proto_register_mpls_mac(void)
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{
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static hf_register_info hf[] = {
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{
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&hf_mpls_mac_reserved,
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{
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"Reserved", "mpls_mac.reserved",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_length_total,
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{
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"TLV Length (Total)", "mpls_mac.tlv_length_total",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_flags,
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{
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"Flags", "mpls_mac.flags",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_flags_a,
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{
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"Flags A", "mpls_mac.flags.a",
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FT_BOOLEAN, 8, NULL, 0x80,
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"set by a receiver to acknowledge receipt and processing of a MAC Address Withdraw OAM Message", HFILL
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}
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},
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{
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&hf_mpls_mac_flags_r,
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{
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"Flags R", "mpls_mac.flags.r",
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FT_BOOLEAN, 8, NULL, 0x40,
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"Set to indicate if the sender is requesting reset of the sequence numbers", HFILL
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}
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},
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{
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&hf_mpls_mac_flags_reserved,
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{
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"Flags Reserved", "mpls_mac.flags.reserved",
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FT_UINT8, BASE_HEX, NULL, 0x3F,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv,
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{
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"TLV", "mpls_mac.tlv",
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FT_NONE, BASE_NONE, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_res,
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{
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"Res(erved)", "mpls_mac.tlv.res",
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FT_UINT16, BASE_HEX, NULL, 0xC000,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_type,
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{
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"TLV Type", "mpls_mac.tlv.type",
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FT_UINT16, BASE_HEX, NULL, 0x3FFF,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_length,
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{
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"TLV Length", "mpls_mac.tlv.length",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_value,
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{
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"TLV Value", "mpls_mac.tlv.value",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_sequence_number,
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{
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"Sequence Number", "mpls_mac.tlv.sequence_number",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL
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}
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},
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};
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static gint *ett[] = {
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&ett_mpls_mac,
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&ett_mpls_mac_flags,
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&ett_mpls_mac_tlv,
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};
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proto_mpls_mac =
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proto_register_protocol("MPLS-MAC",
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"Media Access Control (MAC) Address Withdrawal over Static Pseudowire",
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"mpls_mac");
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proto_register_field_array(proto_mpls_mac, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_mpls_mac(void)
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{
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dissector_handle_t mpls_mac_handle;
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mpls_mac_handle = create_dissector_handle( dissect_mpls_mac, proto_mpls_mac );
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dissector_add_uint("pwach.channel_type", PW_ACH_TYPE_MAC, mpls_mac_handle);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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