31a54708f4
Change-Id: Ie39ef054a4a942687bd079f3a4d8c2cc55d5f22c Reviewed-on: https://code.wireshark.org/review/12485 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Michael Mann <mmann78@netscape.net>
416 lines
15 KiB
C
416 lines
15 KiB
C
/* packet-lisp-tcp.c
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* Routines for Locator/ID Separation Protocol (LISP) TCP Control Message dissection
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* Copyright 2014 Lorand Jakab <ljakab@ac.upc.edu>
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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,
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* 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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#include <epan/afn.h>
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#include <epan/expert.h>
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#include "packet-tcp.h"
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void proto_register_lisp_tcp(void);
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void proto_reg_handoff_lisp_tcp(void);
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#define INET_ADDRLEN 4
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#define INET6_ADDRLEN 16
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#define EUI48_ADDRLEN 6
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/*
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* See draft-kouvelas-lisp-rloc-membership-00 "LISP RLOC Membership
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* Distribution" for packet format and protocol information.
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*/
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#define LISP_CONTROL_PORT 4342
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#define LISP_MSG_HEADER_LEN 4
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#define LISP_MSG_END_MARKER 0x9FACADE9
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/* LISP Reliable Transport message types */
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#define MEMBERSHIP_BASE 22
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static gboolean lisp_tcp_desegment = TRUE;
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/* Initialize the protocol and registered fields */
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static int proto_lisp_tcp = -1;
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static int hf_lisp_tcp_message_type = -1;
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static int hf_lisp_tcp_message_length = -1;
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static int hf_lisp_tcp_message_id = -1;
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static int hf_lisp_tcp_message_data = -1;
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static int hf_lisp_tcp_message_eid_afi = -1;
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static int hf_lisp_tcp_message_iid = -1;
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static int hf_lisp_tcp_message_sid = -1;
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static int hf_lisp_tcp_message_err = -1;
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static int hf_lisp_tcp_message_site_id = -1;
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static int hf_lisp_tcp_message_rloc_afi = -1;
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static int hf_lisp_tcp_message_rloc_ipv4 = -1;
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static int hf_lisp_tcp_message_rloc_ipv6 = -1;
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static int hf_lisp_tcp_message_rid = -1;
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static int hf_lisp_tcp_message_end_marker = -1;
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/* Initialize the subtree pointers */
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static gint ett_lisp_tcp = -1;
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/* Initialize expert fields */
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static expert_field ei_lisp_tcp_undecoded = EI_INIT;
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static expert_field ei_lisp_tcp_invalid_length = EI_INIT;
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static expert_field ei_lisp_tcp_invalid_marker = EI_INIT;
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static dissector_handle_t lisp_tcp_handle;
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const value_string lisp_tcp_typevals[] = {
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{ MEMBERSHIP_BASE, "RLOC Membership Subscribe" },
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{ MEMBERSHIP_BASE + 1, "RLOC Membership Subscribe ACK" },
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{ MEMBERSHIP_BASE + 2, "RLOC Membership Subscribe NACK" },
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{ MEMBERSHIP_BASE + 3, "RLOC Membership Unsubscribe" },
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{ MEMBERSHIP_BASE + 4, "RLOC Membership Element Add" },
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{ MEMBERSHIP_BASE + 5, "RLOC Membership Element Remove" },
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{ MEMBERSHIP_BASE + 6, "RLOC Membership Refresh Request" },
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{ MEMBERSHIP_BASE + 7, "RLOC Membership Refresh Begin" },
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{ MEMBERSHIP_BASE + 8, "RLOC Membership Refresh End" },
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{ 0, NULL}
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};
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const value_string lisp_tcp_membership_subscribe_errors[] = {
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{ 0, "Undefined" },
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{ 1, "Instance not found" },
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{ 2, "Distribution not enabled" },
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{ 3, "Not Authorized" },
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{ 0, NULL}
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};
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/*
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* Dissector for Membership messages
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*/
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static int
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dissect_lisp_tcp_membership_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *message_tree,
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guint offset, guint16 type, guint16 data_len, proto_item *tim)
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{
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guint32 iid, sid, rid;
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guint8 err;
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guint64 siteid;
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guint16 afi;
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/* EID AFI (2 bytes) */
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_eid_afi, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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data_len -= 2;
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/* Instance ID (4 bytes) */
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iid = tvb_get_ntohl(tvb, offset);
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_iid, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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data_len -= 4;
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proto_item_append_text(tim, ", IID: %u", iid);
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switch (type) {
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case MEMBERSHIP_BASE + 1:
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case MEMBERSHIP_BASE + 2:
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/* Subscribe ID (4 bytes) */
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sid = tvb_get_ntohl(tvb, offset);
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_sid, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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data_len -= 4;
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Sub ID: %u", sid);
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proto_item_append_text(tim, ", Sub ID: %u", sid);
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if (type == MEMBERSHIP_BASE + 2) {
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/* Error code (1 byte) */
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err = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_err, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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data_len -= 1;
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proto_item_append_text(tim, ", Error code: %s",
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val_to_str(err, lisp_tcp_membership_subscribe_errors, "Unknown error code (%u)"));
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}
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break;
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case MEMBERSHIP_BASE + 4:
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case MEMBERSHIP_BASE + 5:
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/* Site ID (8 bytes) */
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siteid = tvb_get_ntoh64(tvb, offset);
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_site_id, tvb, offset, 8, ENC_BIG_ENDIAN);
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offset += 8;
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data_len -= 8;
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proto_item_append_text(tim, ", Site-ID: %"G_GINT64_MODIFIER"u", siteid);
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/* RLOC AFI (2 bytes) */
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afi = tvb_get_ntohs(tvb, offset);
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_rloc_afi, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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data_len -= 2;
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switch (afi) {
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case AFNUM_INET:
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_rloc_ipv4, tvb, offset, INET_ADDRLEN, ENC_NA);
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proto_item_append_text(tim, ", RLOC: %s", tvb_ip_to_str(tvb, offset));
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col_append_fstr(pinfo->cinfo, COL_INFO, " [%u] %s", iid, tvb_ip_to_str(tvb, offset));
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offset += INET_ADDRLEN;
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data_len -= INET_ADDRLEN;
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break;
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case AFNUM_INET6:
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_rloc_ipv6, tvb, offset, INET6_ADDRLEN, ENC_NA);
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proto_item_append_text(tim, ", RLOC: %s", tvb_ip6_to_str(tvb, offset));
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col_append_fstr(pinfo->cinfo, COL_INFO, " [%u] %s", iid, tvb_ip6_to_str(tvb, offset));
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offset += INET6_ADDRLEN;
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data_len -= INET6_ADDRLEN;
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break;
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}
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break;
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case MEMBERSHIP_BASE + 7:
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case MEMBERSHIP_BASE + 8:
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/* Request ID (4 bytes) */
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rid = tvb_get_ntohl(tvb, offset);
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_rid, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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data_len -= 4;
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proto_item_append_text(tim, ", Req ID: %u", rid);
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break;
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}
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if (data_len) {
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_data, tvb, offset, data_len, ENC_NA);
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offset += data_len;
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expert_add_info_format(pinfo, message_tree, &ei_lisp_tcp_undecoded, "Work-in-progress");
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}
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return offset;
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}
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/*
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* Dissector for individual messages
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*/
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static int
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dissect_lisp_tcp_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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guint offset = 0;
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guint16 type, len, data_len;
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guint32 id, marker;
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proto_item *tim, *til, *tiem;
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proto_tree *message_tree;
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tim = proto_tree_add_item(tree, proto_lisp_tcp, tvb, offset, -1, ENC_NA);
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message_tree = proto_item_add_subtree(tim, ett_lisp_tcp);
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/* Message type (2 bytes) */
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type = tvb_get_ntohs(tvb, offset);
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_type, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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/* Message length (2 bytes) */
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len = tvb_get_ntohs(tvb, offset);
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til = proto_tree_add_item(message_tree, hf_lisp_tcp_message_length, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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if (len < 8) {
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expert_add_info_format(pinfo, til, &ei_lisp_tcp_invalid_length,
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"Invalid message length (%u < 8)", len);
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} else if (len > 8) {
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/* Message ID (4 bytes) */
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id = tvb_get_ntohl(tvb, offset);
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_id, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, "; ", "Msg: %u, %s", id, val_to_str(type, lisp_tcp_typevals,
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"Unknown type (%u)"));
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proto_item_append_text(tim, ", Msg: %u, %s", id, val_to_str(type, lisp_tcp_typevals,
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"Unknown type (%u)"));
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proto_item_set_len(tim, len);
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data_len = len - 12;
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if (type >= MEMBERSHIP_BASE && type <= MEMBERSHIP_BASE + 8) {
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/* EID instance membership message types */
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offset = dissect_lisp_tcp_membership_message(tvb, pinfo, message_tree, offset, type, data_len, tim);
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} else {
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/* Message Data (variable length) */
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proto_tree_add_item(message_tree, hf_lisp_tcp_message_data, tvb, offset, data_len, ENC_NA);
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offset += data_len;
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}
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}
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/* Message End Marker (4 bytes) */
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marker = tvb_get_ntohl(tvb, offset);
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tiem = proto_tree_add_item(message_tree, hf_lisp_tcp_message_end_marker, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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if (marker != LISP_MSG_END_MARKER) {
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expert_add_info_format(pinfo, tiem, &ei_lisp_tcp_invalid_marker,
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"Invalid message end marker (0x%08x)", marker);
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} else {
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proto_item_append_text(tiem, " (correct)");
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}
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return offset;
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}
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/*
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* Get message length, needed by tcp_dissect_pdus()
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*/
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static guint
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get_lisp_tcp_message_len(packet_info *pinfo _U_, tvbuff_t *tvb,
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int offset, void *data _U_)
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{
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guint16 mlen;
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/* Get length of memebership message */
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mlen = tvb_get_ntohs(tvb, offset + 2);
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return mlen;
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}
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/*
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* Main dissector code
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*/
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static int
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dissect_lisp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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/* Clear Info column before fetching data in case an exception is thrown */
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col_clear(pinfo->cinfo, COL_INFO);
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/* Make entries in Protocol column and Info column on summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "LISP");
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/* Reassemble and dissect PDUs */
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tcp_dissect_pdus(tvb, pinfo, tree, lisp_tcp_desegment, LISP_MSG_HEADER_LEN,
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get_lisp_tcp_message_len, dissect_lisp_tcp_message, data);
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/* Return the amount of data this dissector was able to dissect */
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return tvb_reported_length(tvb);
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}
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/*
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* Register the LISP protocol with Wireshark
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*/
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void
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proto_register_lisp_tcp(void)
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{
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/* Setup list of header fields */
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static hf_register_info hf[] = {
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{ &hf_lisp_tcp_message_type,
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{ "Type", "lisp-tcp.message.type",
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FT_UINT16, BASE_DEC, VALS(lisp_tcp_typevals), 0x0, "TLV Message Type", HFILL }},
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{ &hf_lisp_tcp_message_length,
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{ "Length", "lisp-tcp.message.length",
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FT_UINT16, BASE_DEC, NULL, 0x0, "TLV Message Length", HFILL }},
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{ &hf_lisp_tcp_message_id,
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{ "Message ID", "lisp-tcp.message.id",
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FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_lisp_tcp_message_data,
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{ "Message Data", "lisp-tcp.message.data",
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FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
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{ &hf_lisp_tcp_message_eid_afi,
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{ "EID AFI", "lisp-tcp.message.eid.afi",
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FT_UINT16, BASE_DEC, VALS(afn_vals), 0x0, NULL, HFILL }},
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{ &hf_lisp_tcp_message_iid,
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{ "Instance ID", "lisp-tcp.message.iid",
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FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_lisp_tcp_message_sid,
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{ "Subscribe Message ID", "lisp-tcp.message.sid",
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FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_lisp_tcp_message_err,
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{ "Error code", "lisp-tcp.message.err",
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FT_UINT8, BASE_DEC, VALS(lisp_tcp_membership_subscribe_errors), 0x0, NULL, HFILL }},
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{ &hf_lisp_tcp_message_site_id,
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{ "Site-ID", "lisp-tcp.message.site_id",
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FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_lisp_tcp_message_rloc_afi,
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{ "RLOC AFI", "lisp-tcp.message.rloc.afi",
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FT_UINT16, BASE_DEC, VALS(afn_vals), 0x0, NULL, HFILL }},
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{ &hf_lisp_tcp_message_rloc_ipv4,
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{ "RLOC", "lisp-tcp.message.rloc.ipv4",
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FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
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{ &hf_lisp_tcp_message_rloc_ipv6,
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{ "RLOC", "lisp-tcp.message.rloc.ipv6",
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FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
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{ &hf_lisp_tcp_message_rid,
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{ "Request Message ID", "lisp-tcp.message.rid",
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FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_lisp_tcp_message_end_marker,
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{ "Message End Marker", "lisp-tcp.message.end_marker",
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FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_lisp_tcp
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};
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static ei_register_info ei[] = {
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{ &ei_lisp_tcp_undecoded, { "lisp-tcp.undecoded", PI_UNDECODED, PI_WARN, "Not dissected yet (report to wireshark.org)", EXPFILL }},
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{ &ei_lisp_tcp_invalid_length, { "lisp-tcp.invalid_marker", PI_PROTOCOL, PI_ERROR, "Invalid message length", EXPFILL }},
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{ &ei_lisp_tcp_invalid_marker, { "lisp-tcp.invalid_marker", PI_PROTOCOL, PI_ERROR, "Invalid message end marker", EXPFILL }},
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};
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expert_module_t* expert_lisp_tcp;
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/* Register the protocol name and description */
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proto_lisp_tcp = proto_register_protocol("Locator/ID Separation Protocol (Reliable Transport)",
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"LISP Reliable Transport", "lisp-tcp");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_lisp_tcp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_lisp_tcp = expert_register_protocol(proto_lisp_tcp);
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expert_register_field_array(expert_lisp_tcp, ei, array_length(ei));
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/* Register dissector so that other dissectors can call it */
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lisp_tcp_handle = register_dissector("lisp-tcp", dissect_lisp_tcp, proto_lisp_tcp);
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}
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/*
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* Simple form of proto_reg_handoff_lisp_tcp which can be used if there are
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* no prefs-dependent registration function calls.
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*/
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void
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proto_reg_handoff_lisp_tcp(void)
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{
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dissector_add_uint("tcp.port", LISP_CONTROL_PORT, lisp_tcp_handle);
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}
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/*
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* Editor modelines - http://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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