2005-01-20 05:40:56 +00:00
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/* packet-juniper.c
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* Routines for Juniper Networks, Inc. packet disassembly
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* Copyright 2005 Hannes Gredler <hannes@juniper.net>
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include "etypes.h"
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#include <epan/prefs.h>
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#include <epan/addr_resolv.h>
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#include "ppptypes.h"
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#include "packet-ppp.h"
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#include "packet-ip.h"
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#define JUNIPER_FLAG_PKT_OUT 0x00 /* Outgoing packet */
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#define JUNIPER_FLAG_PKT_IN 0x01 /* Incoming packet */
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#define JUNIPER_FLAG_NO_L2 0x02 /* L2 header stripped */
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#define JUNIPER_ATM2_PKT_TYPE_MASK 0x70
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#define JUNIPER_ATM2_GAP_COUNT_MASK 0x3F
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#define JUNIPER_PCAP_MAGIC 0x4d4743
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#define JUNIPER_ATM1 1
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#define JUNIPER_ATM2 2
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#define JUNIPER_HDR_SNAP 0xaaaa03
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#define JUNIPER_HDR_NLPID 0xfefe03
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#define JUNIPER_HDR_CNLPID 0x03
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static const value_string juniper_direction_vals[] = {
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{JUNIPER_FLAG_PKT_OUT, "Out"},
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{JUNIPER_FLAG_PKT_IN, "In"},
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{0, NULL}
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};
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static const value_string juniper_l2hdr_presence_vals[] = {
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{ 0, "Present"},
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{ 2, "none"},
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{0, NULL}
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};
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static int proto_juniper = -1;
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static int hf_juniper_magic = -1;
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static int hf_juniper_direction = -1;
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static int hf_juniper_l2hdr_presence = -1;
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static int hf_juniper_atm1_cookie = -1;
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static int hf_juniper_atm2_cookie = -1;
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static gint ett_juniper = -1;
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static dissector_handle_t ipv4_handle;
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static dissector_handle_t ipv6_handle;
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static dissector_handle_t llc_handle;
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static dissector_handle_t eth_handle;
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static dissector_handle_t ppp_handle;
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static dissector_handle_t data_handle;
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static dissector_table_t osinl_subdissector_table;
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static dissector_table_t osinl_excl_subdissector_table;
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static void dissect_juniper_atm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint16 atm_pictype);
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2005-01-20 07:02:08 +00:00
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static gboolean ppp_heuristic_guess(guint16 proto);
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static guint ip_heuristic_guess(guint8 ip_header_byte);
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2005-01-20 05:40:56 +00:00
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/* wrapper for passing the PIC type to the generic ATM dissector */
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static void
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dissect_juniper_atm1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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dissect_juniper_atm(tvb,pinfo,tree, JUNIPER_ATM1);
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}
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/* wrapper for passing the PIC type to the generic ATM dissector */
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static void
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dissect_juniper_atm2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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dissect_juniper_atm(tvb,pinfo,tree, JUNIPER_ATM2);
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}
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/* generic ATM dissector */
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static void
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dissect_juniper_atm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint16 atm_pictype)
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{
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proto_item *ti,*tisub;
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proto_tree *subtree = NULL;
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guint8 direction,l2hdr_presence,flags,ipvers,atm1_header_len,atm2_header_len;
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guint32 magic_number, cookie1, proto;
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guint64 cookie2;
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guint offset;
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tvbuff_t *next_tvb;
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switch (atm_pictype) {
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case JUNIPER_ATM1:
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Juniper ATM1");
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break;
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case JUNIPER_ATM2:
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Juniper ATM2");
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break;
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default: /* should not happen */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Juniper ATM unknown");
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return;
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}
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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offset = 0;
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magic_number = tvb_get_ntoh24(tvb, 0);
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flags = tvb_get_guint8(tvb, 3);
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direction = flags & JUNIPER_FLAG_PKT_IN;
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l2hdr_presence = flags & JUNIPER_FLAG_NO_L2;
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if ((flags & JUNIPER_FLAG_NO_L2) == JUNIPER_FLAG_NO_L2) {
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atm1_header_len = 8;
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atm2_header_len = 8;
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}
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else {
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atm1_header_len = 8;
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atm2_header_len = 12;
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}
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switch (atm_pictype) {
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case JUNIPER_ATM1:
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ti = proto_tree_add_text (tree, tvb, 0, atm1_header_len, "Juniper ATM1 PIC");
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break;
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case JUNIPER_ATM2:
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ti = proto_tree_add_text (tree, tvb, 0, atm2_header_len, "Juniper ATM2 PIC");
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break;
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default: /* should not happen */
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ti = proto_tree_add_text (tree, tvb, 0, 0 , "Juniper unknown ATM PIC");
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return;
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}
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subtree = proto_item_add_subtree(ti, ett_juniper);
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tisub = proto_tree_add_text (subtree, tvb, 0, 3,
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"Magic-Number: 0x%06x (%scorrect)",
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magic_number,
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(magic_number == JUNIPER_PCAP_MAGIC) ? "" : "in" );
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if (magic_number != JUNIPER_PCAP_MAGIC)
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return;
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tisub = proto_tree_add_uint_format (subtree, hf_juniper_direction, tvb, 3, 1,
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direction, "Direction: %s",
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val_to_str(direction,juniper_direction_vals,"Unknown"));
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tisub = proto_tree_add_uint_format (subtree, hf_juniper_l2hdr_presence, tvb, 3, 1,
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l2hdr_presence, "L2-header: %s",
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val_to_str(l2hdr_presence,juniper_l2hdr_presence_vals,"Unknown"));
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switch (atm_pictype) {
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case JUNIPER_ATM1:
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offset += atm1_header_len;
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break;
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case JUNIPER_ATM2:
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offset += atm2_header_len;
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break;
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default: /* should not happen */
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return;
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}
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if ((flags & JUNIPER_FLAG_NO_L2) == JUNIPER_FLAG_NO_L2) { /* no link header present ? */
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next_tvb = tvb_new_subset(tvb, offset, -1, -1);
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ipvers = ip_heuristic_guess(tvb_get_guint8(tvb, offset)); /* try IP */
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2005-01-29 22:21:09 +00:00
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if (ipvers != 0) {
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ti = proto_tree_add_text (subtree, tvb, offset, 0,
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2005-01-20 05:40:56 +00:00
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"Payload Type: Null encapsulation IPv%u",
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ipvers);
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switch (ipvers) {
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case 6:
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2005-01-29 22:21:09 +00:00
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call_dissector(ipv6_handle, next_tvb, pinfo, tree);
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2005-01-20 05:40:56 +00:00
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break;
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case 4:
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2005-01-29 22:21:09 +00:00
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call_dissector(ipv4_handle, next_tvb, pinfo, tree);
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2005-01-20 05:40:56 +00:00
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break;
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}
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}
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return;
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}
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cookie1 = tvb_get_ntohl(tvb,4);
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cookie2 = tvb_get_ntoh64(tvb,4);
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switch (atm_pictype) {
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case JUNIPER_ATM1:
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tisub = proto_tree_add_uint(subtree, hf_juniper_atm1_cookie, tvb, 4, 4, cookie1);
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break;
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case JUNIPER_ATM2:
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tisub = proto_tree_add_uint64(subtree, hf_juniper_atm2_cookie, tvb, 4, 8, cookie2);
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break;
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default: /* should not happen */
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return;
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}
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next_tvb = tvb_new_subset(tvb, offset, -1, -1);
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/* FIXME OAM cells */
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proto = tvb_get_ntoh24(tvb, offset); /* first try: 24-Bit guess */
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2005-01-29 22:21:09 +00:00
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if (proto == JUNIPER_HDR_NLPID) {
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/*
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* This begins with something that appears to be an LLC header for
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* OSI; is this LLC-multiplexed traffic?
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*/
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ti = proto_tree_add_text (subtree, tvb, offset, 0, "Payload Type: LLC/NLPID ");
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call_dissector(llc_handle, next_tvb, pinfo, tree);
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2005-01-20 05:40:56 +00:00
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return;
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}
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2005-01-29 22:21:09 +00:00
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if (proto == JUNIPER_HDR_SNAP) {
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/*
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* This begins with something that appears to be an LLC header for
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* SNAP; is this LLC-multiplexed traffic?
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*/
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ti = proto_tree_add_text (subtree, tvb, offset, 0, "Payload Type: LLC/SNAP ");
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call_dissector(llc_handle, next_tvb, pinfo, tree);
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2005-01-20 05:40:56 +00:00
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return;
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}
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if (direction != JUNIPER_FLAG_PKT_IN && /* ether-over-1483 encaps ? */
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(cookie1 & JUNIPER_ATM2_GAP_COUNT_MASK) &&
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atm_pictype != JUNIPER_ATM1) {
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2005-01-29 22:21:09 +00:00
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ti = proto_tree_add_text (subtree, tvb, offset, 0, "Payload Type: Ethernet");
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call_dissector(eth_handle, next_tvb, pinfo, tree);
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2005-01-20 05:40:56 +00:00
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return;
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}
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proto = tvb_get_ntohs(tvb, offset); /* second try: 16-Bit guess */
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2005-02-01 00:51:42 +00:00
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if ( ppp_heuristic_guess( (guint16) proto) &&
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2005-01-29 22:21:09 +00:00
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atm_pictype != JUNIPER_ATM1) {
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/*
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* This begins with something that appears to be a PPP protocol
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* type; is this VC-multiplexed PPPoA?
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* That's not supported on ATM1 PICs.
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*/
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ti = proto_tree_add_text (subtree, tvb, offset, 0, "Payload Type: VC-MUX PPP");
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call_dissector(ppp_handle, next_tvb, pinfo, tree);
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2005-01-20 05:40:56 +00:00
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return;
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}
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proto = tvb_get_guint8(tvb, offset); /* third try: 8-Bit guess */
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2005-01-29 22:21:09 +00:00
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if ( proto == JUNIPER_HDR_CNLPID ) {
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/*
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* Cisco style NLPID encaps?
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* Is the 0x03 an LLC UI control field?
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*/
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ti = proto_tree_add_text (subtree, tvb, offset, 1, "Payload Type: Cisco NLPID");
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2005-01-20 05:40:56 +00:00
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proto = tvb_get_guint8(tvb, offset+1);
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2005-01-29 22:21:09 +00:00
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if(dissector_try_port(osinl_subdissector_table, proto, next_tvb, pinfo, tree))
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2005-01-20 05:40:56 +00:00
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return;
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next_tvb = tvb_new_subset(tvb, offset+2, -1, -1);
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2005-01-29 22:21:09 +00:00
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if(dissector_try_port(osinl_excl_subdissector_table, proto, next_tvb, pinfo, tree))
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2005-01-20 05:40:56 +00:00
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return;
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}
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2005-02-01 00:51:42 +00:00
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ipvers = ip_heuristic_guess( (guint8) proto);
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2005-01-29 22:21:09 +00:00
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if (ipvers != 0) { /* last resort: VC-MUX encaps ? */
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/*
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* This begins with something that might be the first byte of
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* an IPv4 or IPv6 packet; is this VC-multiplexed IP?
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*/
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ti = proto_tree_add_text (subtree, tvb, offset, 0,
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2005-01-20 05:40:56 +00:00
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"Payload Type: VC-MUX IPv%u",
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ipvers);
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switch (ipvers) {
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case 6:
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2005-01-29 22:21:09 +00:00
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call_dissector(ipv6_handle, next_tvb, pinfo, tree);
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2005-01-20 05:40:56 +00:00
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break;
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case 4:
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2005-01-29 22:21:09 +00:00
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call_dissector(ipv4_handle, next_tvb, pinfo, tree);
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2005-01-20 05:40:56 +00:00
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break;
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}
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return;
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}
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/* could not figure what it is */
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2005-01-29 22:21:09 +00:00
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ti = proto_tree_add_text (subtree, tvb, offset, -1, "Payload Type: unknown");
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call_dissector(data_handle, next_tvb, pinfo, tree);
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2005-01-20 05:40:56 +00:00
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}
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/* list of Juniper supported PPP proto IDs */
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2005-01-20 07:02:08 +00:00
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static gboolean
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ppp_heuristic_guess(guint16 proto) {
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2005-01-20 05:40:56 +00:00
|
|
|
|
|
|
|
switch(proto) {
|
|
|
|
case PPP_IP :
|
|
|
|
case PPP_OSI :
|
|
|
|
case PPP_MPLS_UNI :
|
|
|
|
case PPP_MPLS_MULTI :
|
|
|
|
case PPP_IPCP :
|
|
|
|
case PPP_OSICP :
|
|
|
|
case PPP_MPLSCP :
|
|
|
|
case PPP_LCP :
|
|
|
|
case PPP_PAP :
|
|
|
|
case PPP_CHAP :
|
|
|
|
case PPP_MP :
|
|
|
|
case PPP_IPV6 :
|
|
|
|
case PPP_IPV6CP :
|
2005-01-20 07:02:08 +00:00
|
|
|
return TRUE;
|
2005-01-20 05:40:56 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
2005-01-20 07:02:08 +00:00
|
|
|
return FALSE; /* did not find a ppp header */
|
2005-01-20 05:40:56 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* return the IP version number based on the first byte of the IP header
|
|
|
|
* returns 0 if it does not match a valid first IPv4/IPv6 header byte
|
|
|
|
*/
|
2005-01-20 07:02:08 +00:00
|
|
|
static guint
|
|
|
|
ip_heuristic_guess(guint8 ip_header_byte) {
|
2005-01-20 05:40:56 +00:00
|
|
|
|
|
|
|
switch(ip_header_byte) {
|
|
|
|
case 0x45:
|
|
|
|
case 0x46:
|
|
|
|
case 0x47:
|
|
|
|
case 0x48:
|
|
|
|
case 0x49:
|
|
|
|
case 0x4a:
|
|
|
|
case 0x4b:
|
|
|
|
case 0x4c:
|
|
|
|
case 0x4d:
|
|
|
|
case 0x4e:
|
|
|
|
case 0x4f:
|
|
|
|
return 4;
|
|
|
|
break;
|
|
|
|
case 0x60:
|
|
|
|
case 0x61:
|
|
|
|
case 0x62:
|
|
|
|
case 0x63:
|
|
|
|
case 0x64:
|
|
|
|
case 0x65:
|
|
|
|
case 0x66:
|
|
|
|
case 0x67:
|
|
|
|
case 0x68:
|
|
|
|
case 0x69:
|
|
|
|
case 0x6a:
|
|
|
|
case 0x6b:
|
|
|
|
case 0x6c:
|
|
|
|
case 0x6d:
|
|
|
|
case 0x6e:
|
|
|
|
case 0x6f:
|
|
|
|
return 6;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return 0; /* did not find a ip header */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_register_juniper(void)
|
|
|
|
{
|
|
|
|
static hf_register_info hf[] = {
|
|
|
|
{ &hf_juniper_magic,
|
|
|
|
{ "Magic Number", "juniper.magic-number", FT_UINT24, BASE_HEX,
|
|
|
|
NULL, 0x0, "", HFILL }},
|
|
|
|
{ &hf_juniper_direction,
|
|
|
|
{ "Direction", "juniper.direction", FT_UINT8, BASE_HEX,
|
|
|
|
VALS(juniper_direction_vals), 0x0, "", HFILL }},
|
|
|
|
{ &hf_juniper_l2hdr_presence,
|
|
|
|
{ "L2 header presence", "juniper.l2hdr", FT_UINT8, BASE_HEX,
|
|
|
|
VALS(juniper_l2hdr_presence_vals), 0x0, "", HFILL }},
|
|
|
|
{ &hf_juniper_atm2_cookie,
|
|
|
|
{ "Cookie", "juniper.atm2.cookie", FT_UINT64, BASE_HEX,
|
|
|
|
NULL, 0x0, "", HFILL }},
|
|
|
|
{ &hf_juniper_atm1_cookie,
|
|
|
|
{ "Cookie", "juniper.atm1.cookie", FT_UINT32, BASE_HEX,
|
|
|
|
NULL, 0x0, "", HFILL }},
|
|
|
|
};
|
|
|
|
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_juniper,
|
|
|
|
};
|
|
|
|
|
|
|
|
proto_juniper = proto_register_protocol("Juniper", "Juniper", "juniper");
|
|
|
|
proto_register_field_array(proto_juniper, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_juniper(void)
|
|
|
|
{
|
|
|
|
dissector_handle_t juniper_atm1_handle;
|
|
|
|
dissector_handle_t juniper_atm2_handle;
|
|
|
|
|
|
|
|
osinl_subdissector_table = find_dissector_table("osinl");
|
|
|
|
osinl_excl_subdissector_table = find_dissector_table("osinl.excl");
|
|
|
|
eth_handle = find_dissector("eth_withoutfcs");
|
|
|
|
ppp_handle = find_dissector("ppp");
|
|
|
|
llc_handle = find_dissector("llc");
|
|
|
|
ipv4_handle = find_dissector("ip");
|
|
|
|
ipv6_handle = find_dissector("ipv6");
|
|
|
|
data_handle = find_dissector("data");
|
|
|
|
|
|
|
|
juniper_atm2_handle = create_dissector_handle(dissect_juniper_atm2, proto_juniper);
|
|
|
|
juniper_atm1_handle = create_dissector_handle(dissect_juniper_atm1, proto_juniper);
|
|
|
|
dissector_add("wtap_encap", WTAP_ENCAP_JUNIPER_ATM2, juniper_atm2_handle);
|
|
|
|
dissector_add("wtap_encap", WTAP_ENCAP_JUNIPER_ATM1, juniper_atm1_handle);
|
|
|
|
}
|
|
|
|
|