forked from osmocom/wireshark
268841f3e0
This patch introduces new APIs to allow dissectors to have a preference for a (TCP) port, but the underlying data is actually part of Decode As functionality. For now the APIs are intentionally separate from the regular APIs that register a dissector within a dissector table. It may be possible to eventually combine the two so that all dissectors that register with a dissector table have an opportunity to "automatically" have a preference to adjust the "table value" through the preferences dialog. The tcp.port dissector table was used as the guinea pig. This will eventually be expanded to other dissector tables as well (most notably UDP ports). Some dissectors that "shared" a TCP/UDP port preference were also converted. It also removed the need for some preference callback functions (mostly when the callback function was the proto_reg_handoff function) so there is cleanup around that. Dissectors that has a port preference whose default was 0 were switched to using the dissector_add_for_decode_as_with_preference API rather than dissector_add_uint_with_preference Also added comments for TCP ports used that aren't IANA registered. Change-Id: I99604f95d426ad345f4b494598d94178b886eb67 Reviewed-on: https://code.wireshark.org/review/17724 Reviewed-by: Michael Mann <mmann78@netscape.net>
607 lines
23 KiB
C
607 lines
23 KiB
C
/* packet-msdp.c
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* Routines for Multicast Source Discovery Protocol (MSDP) dissection.
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* draft-ietf-msdp-spec-10.txt
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*
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* Copyright 2001, Heikki Vatiainen <hessu@cs.tut.fi>
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/to_str.h>
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void proto_register_msdp(void);
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void proto_reg_handoff_msdp(void);
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/* MSDP message types. The messages are TLV (Type-Length-Value) encoded */
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enum { MSDP_SA = 1,
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MSDP_SA_REQ,
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MSDP_SA_RSP,
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MSDP_KEEP_ALIVE,
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MSDP_NOTIFICATION,
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/* These are only assigned in MSDP spec. Their use is specified
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* elsewhere */
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MSDP_TRACE_IN_PROGRESS,
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MSDP_TRACE_REPLY
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};
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static const value_string msdp_types[] = {
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{ MSDP_SA, "IPv4 Source-Active" },
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{ MSDP_SA_REQ, "IPv4 Source-Active Request" },
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{ MSDP_SA_RSP, "IPv4 Source-Active Response" },
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{ MSDP_KEEP_ALIVE, "KeepAlive" },
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{ MSDP_NOTIFICATION, "Notification" },
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{ MSDP_TRACE_IN_PROGRESS, "MSDP traceroute in progress" },
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{ MSDP_TRACE_REPLY, "MSDP traceroute reply" },
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{ 0, NULL },
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};
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/* Error codes */
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enum { MESSAGE_HEADER_ERROR = 1,
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SA_REQUEST_ERROR,
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SA_MESSAGE_SA_RESPONSE_ERROR,
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HOLD_TIMER_EXPIRED,
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FSM_ERROR,
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NOTIFICATION,
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CEASE
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};
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static const value_string error_vals[] = {
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{ MESSAGE_HEADER_ERROR, "Message Header Error" },
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{ SA_REQUEST_ERROR, "SA-Request Error" },
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{ SA_MESSAGE_SA_RESPONSE_ERROR, "SA-Message/SA-Response Error" },
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{ HOLD_TIMER_EXPIRED, "Hold Timer Expired" },
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{ FSM_ERROR, "Finite State Machine Error" },
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{ NOTIFICATION, "Notification" },
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{ CEASE, "Cease" },
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{ 0, NULL },
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};
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/* Message Header Error subcodes */
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static const value_string hdr_error_vals[] = {
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{ 0, "Unspecific" },
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{ 2, "Bad Message Length" },
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{ 3, "Bad Message Type" },
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{ 0, NULL },
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};
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/* SA-Request Error subcodes (the O-bit is always clear) */
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static const value_string sa_req_error_vals[] = {
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{ 0, "Unspecific" },
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{ 1, "Invalid Group" },
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{ 0, NULL },
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};
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/* SA-Message/SA-Response Error subcodes */
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static const value_string sa_msg_error_vals[] = {
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{ 0, "Unspecific" },
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{ 1, "Invalid Entry Count" },
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{ 2, "Invalid RP Address" },
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{ 3, "Invalid Group Address" },
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{ 4, "Invalid Source Address" },
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{ 5, "Invalid Sprefix Length" },
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{ 6, "Looping SA (Self is RP)" },
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{ 7, "Unknown Encapsulation" },
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{ 8, "Administrative Scope Boundary Violated" },
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{ 0, NULL },
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};
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/* Finite State Machine Error subcodes (the O-bit is always clear) */
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static const value_string fsm_error_vals[] = {
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{ 0, "Unspecific" },
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{ 1, "Unexpected Message Type FSM Error" },
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{ 0, NULL },
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};
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/*
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* Hold Timer Expired subcodes (the O-bit is always clear):
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* Notification subcodes (the O-bit is always clear):
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* Cease subcodes (the O-bit is always clear):
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*
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* These have only "Unspecific" specified.
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*/
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static const value_string sa_unspec_error_vals[] = {
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{ 0, "Unspecific" },
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{ 0, NULL },
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};
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#define MSDP_PORT 639
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/* Initialize the protocol and registered fields */
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static int proto_msdp = -1;
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static int hf_msdp_type = -1;
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static int hf_msdp_length = -1;
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static int hf_msdp_sa_entry_count = -1;
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static int hf_msdp_sa_rp_addr = -1;
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static int hf_msdp_sa_reserved = -1;
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static int hf_msdp_sa_sprefix_len = -1;
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static int hf_msdp_sa_group_addr = -1;
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static int hf_msdp_sa_src_addr = -1;
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static int hf_msdp_sa_req_res = -1;
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static int hf_msdp_sa_req_group = -1;
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static int hf_msdp_not_o = -1;
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static int hf_msdp_not_error = -1;
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static int hf_msdp_not_error_sub = -1;
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static int hf_msdp_not_group_address = -1;
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static int hf_msdp_not_rp_address = -1;
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static int hf_msdp_not_source_address = -1;
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static int hf_msdp_not_res = -1;
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static int hf_msdp_not_entry_count = -1;
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static int hf_msdp_not_sprefix_len = -1;
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static int hf_msdp_tlv_contents = -1;
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static int hf_msdp_trailing_junk = -1;
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static int hf_msdp_unknown_encap = -1;
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static int hf_msdp_unknown_data = -1;
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static gint ett_msdp = -1;
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static gint ett_msdp_sa_entry = -1;
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static gint ett_msdp_sa_enc_data = -1;
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static gint ett_msdp_not_data = -1;
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static dissector_handle_t ip_handle;
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static void
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dissect_msdp_sa(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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int *offset, int len);
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static void
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dissect_msdp_notification(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int *offset, guint16 tlv_len);
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static int
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dissect_msdp(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 *msdp_tree;
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int offset;
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guint8 type;
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guint16 length;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MSDP");
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col_set_str(pinfo->cinfo, COL_INFO, val_to_str_const(tvb_get_guint8(tvb, 0),
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msdp_types,
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"<Unknown MSDP message type>"));
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ti = proto_tree_add_item(tree, proto_msdp, tvb, 0, -1, ENC_NA);
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msdp_tree = proto_item_add_subtree(ti, ett_msdp);
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offset = 0;
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while (tvb_reported_length_remaining(tvb, offset) >= 3) {
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type = tvb_get_guint8(tvb, offset);
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length = tvb_get_ntohs(tvb, offset + 1);
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if (length < 3)
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break;
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proto_tree_add_uint(msdp_tree, hf_msdp_type, tvb, offset, 1, type);
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proto_tree_add_uint(msdp_tree, hf_msdp_length, tvb, offset + 1, 2, length);
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offset += 3;
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length -= 3;
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switch (type) {
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case MSDP_SA:
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case MSDP_SA_RSP:
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dissect_msdp_sa(tvb, pinfo, msdp_tree, &offset,
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length);
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break;
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case MSDP_SA_REQ:
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proto_tree_add_item(msdp_tree, hf_msdp_sa_req_res, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(msdp_tree, hf_msdp_sa_req_group, tvb, offset + 1, 4, ENC_BIG_ENDIAN);
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offset += 5;
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break;
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case MSDP_NOTIFICATION:
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dissect_msdp_notification(tvb, pinfo, msdp_tree, &offset, length);
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break;
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default:
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if (length > 0)
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proto_tree_add_item(msdp_tree, hf_msdp_tlv_contents, tvb, offset, length, ENC_NA);
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offset += length;
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break;
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}
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}
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if (tvb_reported_length_remaining(tvb, offset) > 0)
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proto_tree_add_item(msdp_tree, hf_msdp_trailing_junk, tvb, offset, -1, ENC_NA);
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return tvb_captured_length(tvb);
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}
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/* Both Source-Active and Source-Active Response have the same format
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* with one exception. Encapsulated multicast data is not allowed in
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* SA Response.
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*/
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static void dissect_msdp_sa(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree, int *offset, int length)
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{
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guint8 entries;
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if (length < 1)
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return;
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entries = tvb_get_guint8(tvb, *offset);
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proto_tree_add_uint(tree, hf_msdp_sa_entry_count, tvb, *offset, 1, entries);
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*offset += 1;
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length -= 1;
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if (length < 4) {
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*offset += length;
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return;
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}
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proto_tree_add_item(tree, hf_msdp_sa_rp_addr, tvb, *offset, 4, ENC_BIG_ENDIAN);
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*offset += 4;
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length -= 4;
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/* Put each of the (S,G) entries in their own subtree.
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* This is probably visually better.
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*/
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while (entries-- > 0) {
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proto_tree *entry_tree;
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if (length < 12) {
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*offset += length;
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return;
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}
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entry_tree = proto_tree_add_subtree_format(tree, tvb, *offset, 12, ett_msdp_sa_entry, NULL,
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"(S,G) block: %s/%u -> %s",
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tvb_ip_to_str(tvb, *offset + 8),
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tvb_get_guint8(tvb, *offset + 3),
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tvb_ip_to_str(tvb, *offset + 4));
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proto_tree_add_item(entry_tree, hf_msdp_sa_reserved, tvb, *offset, 3, ENC_BIG_ENDIAN);
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*offset += 3;
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length -= 3;
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proto_tree_add_item(entry_tree, hf_msdp_sa_sprefix_len, tvb, *offset, 1, ENC_BIG_ENDIAN);
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*offset += 1;
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length -= 1;
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proto_tree_add_item(entry_tree, hf_msdp_sa_group_addr, tvb, *offset, 4, ENC_BIG_ENDIAN);
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*offset += 4;
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length -= 4;
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proto_tree_add_item(entry_tree, hf_msdp_sa_src_addr, tvb, *offset, 4, ENC_BIG_ENDIAN);
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*offset += 4;
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length -= 4;
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}
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/*
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* Check if an encapsulated multicast IPv4 packet follows
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*/
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if (length > 0) {
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proto_tree *enc_tree;
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gint available_length, reported_length;
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tvbuff_t *next_tvb;
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enc_tree = proto_tree_add_subtree_format(tree, tvb, *offset, length,
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ett_msdp_sa_enc_data, NULL, "Encapsulated IPv4 packet: %u bytes",
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length);
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available_length = tvb_captured_length_remaining(tvb, *offset);
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reported_length = tvb_reported_length_remaining(tvb, *offset);
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DISSECTOR_ASSERT(available_length >= 0);
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DISSECTOR_ASSERT(reported_length >= 0);
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if (available_length > reported_length)
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available_length = reported_length;
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if (available_length > length)
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available_length = length;
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if (reported_length > length)
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reported_length = length;
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next_tvb = tvb_new_subset(tvb, *offset, available_length,
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reported_length);
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/* Set the information columns read-only so that they
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* reflect the MSDP packet rather than the
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* encapsulated packet.
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*/
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col_set_writable(pinfo->cinfo, COL_INFO, FALSE);
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call_dissector(ip_handle, next_tvb, pinfo, enc_tree);
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}
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*offset += length;
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return;
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}
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/* Note: updates *offset */
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static void add_notification_data_ipv4addr(tvbuff_t *tvb, proto_tree *tree, int *offset, int hf_addr)
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{
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proto_tree_add_item(tree, hf_msdp_not_res, tvb, *offset, 3, ENC_BIG_ENDIAN);
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*offset += 3;
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proto_tree_add_item(tree, hf_addr, tvb, *offset, 4, ENC_BIG_ENDIAN);
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*offset += 4;
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return;
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}
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static void dissect_msdp_notification(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int *offset, guint16 tlv_len)
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{
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guint8 error, error_sub;
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const value_string *vals;
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proto_tree_add_item(tree, hf_msdp_not_o, tvb, *offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_msdp_not_error, tvb, *offset, 1, ENC_BIG_ENDIAN);
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error = tvb_get_guint8(tvb, *offset);
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error &= 0x7F; /* Error is 7-bit field. O-bit is bit 8 */
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*offset += 1;
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/* Depending on the Error Code, we collect the correct
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* value_strings for the Error subcode
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*/
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switch (error) {
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case MESSAGE_HEADER_ERROR:
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vals = hdr_error_vals;
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break;
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case SA_REQUEST_ERROR:
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vals = sa_req_error_vals;
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break;
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case SA_MESSAGE_SA_RESPONSE_ERROR:
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vals = sa_msg_error_vals;
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break;
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case FSM_ERROR:
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vals = fsm_error_vals;
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break;
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case HOLD_TIMER_EXPIRED:
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case NOTIFICATION:
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case CEASE:
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vals = sa_unspec_error_vals;
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break;
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default:
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vals = sa_unspec_error_vals;
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break;
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}
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error_sub = tvb_get_guint8(tvb, *offset);
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proto_tree_add_uint_format_value(tree, hf_msdp_not_error_sub, tvb, *offset, 1,
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error_sub, "%s (%u)",
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val_to_str_const(error_sub, vals, "<Unknown Error subcode>"),
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error_sub);
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*offset += 1;
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/* Do switch again, this time to dissect the data portion
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* correctly. Ugly.
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*/
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switch (error) {
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case SA_REQUEST_ERROR:
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add_notification_data_ipv4addr(tvb, tree, offset, hf_msdp_not_group_address);
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break;
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case SA_MESSAGE_SA_RESPONSE_ERROR:
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if (error_sub == 0) {
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break;
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} else if (error_sub == 1) {
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proto_tree_add_item(tree, hf_msdp_not_entry_count, tvb, *offset, 1, ENC_BIG_ENDIAN);
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*offset += 1;
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break;
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} else if (error_sub == 2) {
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add_notification_data_ipv4addr(tvb, tree, offset, hf_msdp_not_rp_address);
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break;
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} else if (error_sub == 3 || error_sub == 8) {
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add_notification_data_ipv4addr(tvb, tree, offset, hf_msdp_not_group_address);
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break;
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} else if (error_sub == 4) {
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add_notification_data_ipv4addr(tvb, tree, offset, hf_msdp_not_source_address);
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break;
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} else if (error_sub == 5) {
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proto_tree_add_item(tree, hf_msdp_not_sprefix_len, tvb, *offset, 1, ENC_BIG_ENDIAN);
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*offset += 1;
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break;
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} else if (error_sub == 6) {
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/* No break, causes fall through to next label */
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} else if (error_sub == 7) {
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proto_tree_add_item(tree, hf_msdp_unknown_encap, tvb, *offset, tlv_len - 5, ENC_NA);
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*offset += tlv_len - 5;
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break;
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} else {
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proto_tree_add_item(tree, hf_msdp_unknown_data, tvb, *offset, tlv_len - 5, ENC_NA);
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*offset += tlv_len - 5;
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break;
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}
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/* Fall through */
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case MESSAGE_HEADER_ERROR:
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case NOTIFICATION: {
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tvbuff_t *next_tvb;
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/* Data contains the message that had an error. Even a
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* broken Notification message causes a Notification
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* message with Error Code set to Notification to be
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* sent back.
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*/
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next_tvb = tvb_new_subset_remaining(tvb, *offset);
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dissect_msdp(next_tvb, pinfo, tree, NULL);
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}
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break;
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case FSM_ERROR:
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case HOLD_TIMER_EXPIRED:
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case CEASE:
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/* Do nothing. These contain no data */
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break;
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default:
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if (tlv_len - 5 > 0)
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proto_tree_add_item(tree, hf_msdp_unknown_data, tvb, *offset, tlv_len - 5, ENC_NA);
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*offset += tlv_len - 5;
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break;
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}
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return;
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}
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void
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proto_register_msdp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_msdp_type,
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{ "Type", "msdp.type",
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FT_UINT8, BASE_DEC, VALS(msdp_types), 0,
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"MSDP TLV type", HFILL }
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},
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{ &hf_msdp_length,
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{ "Length", "msdp.length",
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FT_UINT16, BASE_DEC, NULL, 0,
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"MSDP TLV Length", HFILL }
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},
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{ &hf_msdp_sa_entry_count,
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{ "Entry Count", "msdp.sa.entry_count",
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FT_UINT8, BASE_DEC, NULL, 0,
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"MSDP SA Entry Count", HFILL }
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},
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{ &hf_msdp_sa_rp_addr,
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{ "RP Address", "msdp.sa.rp_addr",
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FT_IPv4, BASE_NONE, NULL, 0,
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"Active source's RP address", HFILL }
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},
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{ &hf_msdp_sa_reserved,
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{ "Reserved", "msdp.sa.reserved",
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FT_UINT24, BASE_HEX, NULL, 0,
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"Transmitted as zeros and ignored by a receiver", HFILL }
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},
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{ &hf_msdp_sa_sprefix_len,
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{ "Sprefix len", "msdp.sa.sprefix_len",
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FT_UINT8, BASE_DEC, NULL, 0,
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"The route prefix length associated with source address", HFILL }
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},
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{ &hf_msdp_sa_group_addr,
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{ "Group Address", "msdp.sa.group_addr",
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FT_IPv4, BASE_NONE, NULL, 0,
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"The group address the active source has sent data to", HFILL }
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},
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{ &hf_msdp_sa_src_addr,
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{ "Source Address", "msdp.sa.src_addr",
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FT_IPv4, BASE_NONE, NULL, 0,
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"The IP address of the active source", HFILL }
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},
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{ &hf_msdp_sa_req_res,
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{ "Reserved", "msdp.sa_req.res",
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FT_UINT8, BASE_HEX, NULL, 0,
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"Transmitted as zeros and ignored by a receiver", HFILL }
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},
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{ &hf_msdp_sa_req_group,
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{ "Group Address", "msdp.sa_req.group_addr",
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FT_IPv4, BASE_NONE, NULL, 0,
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"The group address the MSDP peer is requesting", HFILL }
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},
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{ &hf_msdp_not_o,
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{ "Open-bit", "msdp.not.o",
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FT_UINT8, BASE_HEX, NULL, 0x80,
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"If clear, the connection will be closed", HFILL }
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},
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{ &hf_msdp_not_error,
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{ "Error Code", "msdp.not.error",
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FT_UINT8, BASE_DEC, VALS(error_vals), 0x7F,
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"Indicates the type of Notification", HFILL }
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},
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{ &hf_msdp_not_error_sub,
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{ "Error subcode", "msdp.not.error_sub",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_msdp_not_group_address,
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{ "Group address", "msdp.not.group_address",
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FT_IPv4, BASE_NONE, NULL, 0,
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"Group address in Notification messages", HFILL }
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},
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{ &hf_msdp_not_rp_address,
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{ "RP address", "msdp.not.rp_address",
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FT_IPv4, BASE_NONE, NULL, 0,
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"RP address in Notification messages", HFILL }
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},
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{ &hf_msdp_not_source_address,
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{ "Source address", "msdp.not.source_address",
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FT_IPv4, BASE_NONE, NULL, 0,
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"Source address in Notification messages", HFILL }
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},
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{ &hf_msdp_not_res,
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{ "Reserved", "msdp.not.res",
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FT_UINT24, BASE_HEX, NULL, 0,
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"Reserved field in Notification messages", HFILL }
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},
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{ &hf_msdp_not_entry_count,
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{ "Entry Count", "msdp.not.entry_count",
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FT_UINT24, BASE_HEX, NULL, 0,
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"Entry Count in Notification messages", HFILL }
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},
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{ &hf_msdp_not_sprefix_len,
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{ "Sprefix len", "msdp.not.sprefix_len",
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FT_UINT8, BASE_DEC, NULL, 0,
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"Source prefix length in Notification messages", HFILL }
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},
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{ &hf_msdp_tlv_contents,
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{ "TLV contents", "msdp.tlv_contents",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_msdp_trailing_junk,
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{ "Trailing junk", "msdp.trailing_junk",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_msdp_unknown_encap,
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{ "Packet with unknown encapsulation", "msdp.unknown_encap",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_msdp_unknown_data,
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{ "Unknown data", "msdp.unknown_data",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL }
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},
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};
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static gint *ett[] = {
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&ett_msdp,
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&ett_msdp_sa_entry,
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&ett_msdp_sa_enc_data,
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&ett_msdp_not_data,
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};
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proto_msdp = proto_register_protocol("Multicast Source Discovery Protocol",
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"MSDP", "msdp");
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proto_register_field_array(proto_msdp, 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_msdp(void)
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{
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dissector_handle_t msdp_handle;
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msdp_handle = create_dissector_handle(dissect_msdp, proto_msdp);
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dissector_add_uint_with_preference("tcp.port", MSDP_PORT, msdp_handle);
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ip_handle = find_dissector_add_dependency("ip", proto_msdp);
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}
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/*
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* Editor modelines
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*
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* Local Variables:
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* c-basic-offset: 8
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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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* ex: set shiftwidth=8 tabstop=8 expandtab:
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* :indentSize=8:tabSize=8:noTabs=true:
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*/
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