![Michael Mann](/assets/img/avatar_default.png)
Change-Id: I51702e9372551a28ea604d21d4bbf0eb4d9588ae Reviewed-on: https://code.wireshark.org/review/4831 Reviewed-by: Michael Mann <mmann78@netscape.net>
1395 lines
52 KiB
C
1395 lines
52 KiB
C
/* packet-nhrp.c
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* Routines for NBMA Next Hop Resolution Protocol
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* RFC 2332 plus Cisco extensions (documented where?), plus extensions from:
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* RFC 2520: NHRP with Mobile NHCs
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* RFC 2735: NHRP Support for Virtual Private Networks
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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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* CIE decoding for extensions and Cisco 12.4T extensions
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* added by Timo Teras <timo.teras@iki.fi>
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*/
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#include "config.h"
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/addr_resolv.h>
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#include <epan/expert.h>
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#include <epan/etypes.h>
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#include <epan/ipproto.h>
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#include <epan/greproto.h>
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#include <epan/nlpid.h>
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#include <epan/oui.h>
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#include <epan/afn.h>
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#include <epan/in_cksum.h>
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#include <epan/iana_snap_pid.h>
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#include <epan/dissectors/packet-llc.h>
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#include "packet-nhrp.h"
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void proto_register_nhrp(void);
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void proto_reg_handoff_nhrp(void);
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/* forward reference */
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static void _dissect_nhrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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gboolean nested, gboolean codeinfo);
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static int proto_nhrp = -1;
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static int hf_nhrp_hdr_afn = -1;
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static int hf_nhrp_hdr_pro_type = -1;
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static int hf_nhrp_hdr_pro_snap_oui = -1;
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static int hf_nhrp_hdr_pro_snap_pid = -1;
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static int hf_nhrp_hdr_hopcnt = -1;
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static int hf_nhrp_hdr_pktsz = -1;
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static int hf_nhrp_hdr_chksum = -1;
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static int hf_nhrp_hdr_extoff = -1;
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static int hf_nhrp_hdr_version = -1;
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static int hf_nhrp_hdr_op_type = -1;
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static int hf_nhrp_hdr_shtl = -1;
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static int hf_nhrp_hdr_shtl_type = -1;
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static int hf_nhrp_hdr_shtl_len = -1;
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static int hf_nhrp_hdr_sstl = -1;
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static int hf_nhrp_hdr_sstl_type = -1;
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static int hf_nhrp_hdr_sstl_len = -1;
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static int hf_nhrp_src_proto_len = -1;
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static int hf_nhrp_dst_proto_len = -1;
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static int hf_nhrp_flags = -1;
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static int hf_nhrp_flag_Q = -1;
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static int hf_nhrp_flag_N = -1;
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static int hf_nhrp_flag_A = -1;
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static int hf_nhrp_flag_D = -1;
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static int hf_nhrp_flag_U1 = -1;
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static int hf_nhrp_flag_U2 = -1;
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static int hf_nhrp_flag_S = -1;
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static int hf_nhrp_flag_NAT = -1;
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static int hf_nhrp_src_nbma_addr = -1;
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static int hf_nhrp_src_nbma_saddr = -1;
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static int hf_nhrp_src_prot_addr = -1;
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static int hf_nhrp_dst_prot_addr = -1;
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static int hf_nhrp_request_id = -1;
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static int hf_nhrp_code = -1;
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static int hf_nhrp_prefix_len = -1;
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static int hf_nhrp_unused = -1;
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static int hf_nhrp_mtu = -1;
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static int hf_nhrp_holding_time = -1;
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static int hf_nhrp_cli_addr_tl = -1;
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static int hf_nhrp_cli_addr_tl_type = -1;
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static int hf_nhrp_cli_addr_tl_len = -1;
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static int hf_nhrp_cli_saddr_tl = -1;
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static int hf_nhrp_cli_saddr_tl_type = -1;
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static int hf_nhrp_cli_saddr_tl_len = -1;
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static int hf_nhrp_cli_prot_len = -1;
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static int hf_nhrp_pref = -1;
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static int hf_nhrp_client_nbma_addr = -1;
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static int hf_nhrp_client_nbma_saddr = -1;
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static int hf_nhrp_client_prot_addr = -1;
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static int hf_nhrp_ext_C = -1;
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static int hf_nhrp_ext_type = -1;
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static int hf_nhrp_ext_len = -1;
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/* static int hf_nhrp_ext_value = -1; */ /* TBD: Not used */
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static int hf_nhrp_error_code = -1;
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static int hf_nhrp_error_offset = -1;
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/* static int hf_nhrp_error_packet = -1; */ /* TBD: Not used */
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static int hf_nhrp_auth_ext_reserved = -1;
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static int hf_nhrp_auth_ext_spi = -1;
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static int hf_nhrp_auth_ext_src_addr = -1;
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static int hf_nhrp_vendor_ext_id = -1;
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static int hf_nhrp_devcap_ext_srccap = -1;
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static int hf_nhrp_devcap_ext_srccap_V = -1;
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static int hf_nhrp_devcap_ext_dstcap = -1;
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static int hf_nhrp_devcap_ext_dstcap_V = -1;
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static int hf_nhrp_unknown_ext_value = -1;
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/* Generated from convert_proto_tree_add_text.pl */
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static int hf_nhrp_dst_prot_addr_bytes = -1;
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static int hf_nhrp_auth_ext_src_addr_bytes = -1;
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static int hf_nhrp_vendor_ext_data = -1;
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static int hf_nhrp_protocol_type = -1;
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static int hf_nhrp_src_nbma_addr_bytes = -1;
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static int hf_nhrp_client_nbma_address_bytes = -1;
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static int hf_nhrp_client_prot_addr_bytes = -1;
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static int hf_nhrp_auth_data = -1;
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static int hf_nhrp_src_prot_addr_bytes = -1;
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static gint ett_nhrp = -1;
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static gint ett_nhrp_hdr = -1;
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static gint ett_nhrp_hdr_shtl = -1;
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static gint ett_nhrp_hdr_sstl = -1;
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static gint ett_nhrp_mand = -1;
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static gint ett_nhrp_ext = -1;
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static gint ett_nhrp_mand_flag = -1;
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static gint ett_nhrp_cie = -1;
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static gint ett_nhrp_cie_cli_addr_tl = -1;
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static gint ett_nhrp_cie_cli_saddr_tl = -1;
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static gint ett_nhrp_indication = -1;
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static gint ett_nhrp_auth_ext = -1;
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static gint ett_nhrp_vendor_ext = -1;
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static gint ett_nhrp_devcap_ext = -1;
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static gint ett_nhrp_devcap_ext_srccap = -1;
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static gint ett_nhrp_devcap_ext_dstcap = -1;
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static expert_field ei_nhrp_ext_not_allowed = EI_INIT;
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static expert_field ei_nhrp_hdr_extoff = EI_INIT;
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static expert_field ei_nhrp_ext_malformed = EI_INIT;
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static expert_field ei_nhrp_ext_extra = EI_INIT;
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/* NHRP Packet Types */
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#define NHRP_RESOLUTION_REQ 1
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#define NHRP_RESOLUTION_REPLY 2
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#define NHRP_REGISTRATION_REQ 3
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#define NHRP_REGISTRATION_REPLY 4
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#define NHRP_PURGE_REQ 5
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#define NHRP_PURGE_REPLY 6
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#define NHRP_ERROR_INDICATION 7
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#define NHRP_TRAFFIC_INDICATION 8
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/* NHRP Extension Types */
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#define NHRP_EXT_NULL 0 /* End of Extension */
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#define NHRP_EXT_RESP_ADDR 3 /* Responder Address Extension */
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#define NHRP_EXT_FWD_RECORD 4 /* NHRP Forward Transit NHS Record Extension */
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#define NHRP_EXT_REV_RECORD 5 /* NHRP Reverse Transit NHS Record Extension */
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#define NHRP_EXT_AUTH 7 /* NHRP Authentication Extension */
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#define NHRP_EXT_VENDOR_PRIV 8 /* NHRP Vendor Private Extension */
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#define NHRP_EXT_NAT_ADDRESS 9 /* Cisco NAT Address Extension */
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#define NHRP_EXT_DEV_CAPABILITIES 9 /* RFC 2735: Device Capabilities Extension */
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#define NHRP_EXT_MOBILE_AUTH 10 /* RFC 2520: NHRP Mobile NHC Authentication Extension */
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/* NHRP Error Codes */
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#define NHRP_ERR_UNRECOGNIZED_EXT 0x0001
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#define NHRP_ERR_NHRP_LOOP_DETECT 0x0003
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#define NHRP_ERR_PROT_ADDR_UNREACHABLE 0x0006
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#define NHRP_ERR_PROT_ERROR 0x0007
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#define NHRP_ERR_SDU_SIZE_EXCEEDED 0x0008
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#define NHRP_ERR_INV_EXT 0x0009
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#define NHRP_ERR_INV_RESOLUTION_REPLY 0x000a
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#define NHRP_ERR_AUTH_FAILURE 0x000b
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#define NHRP_ERR_HOP_COUNT_EXCEEDED 0x000f
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#define NHRP_ERR_VPN_MISMATCH 0x0010 /* RFC 2735 */
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#define NHRP_ERR_VPN_UNSUPPORTED 0x0011 /* RFC 2735 */
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/* NHRP CIE codes */
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#define NHRP_CODE_SUCCESS 0x00
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#define NHRP_CODE_ADMIN_PROHIBITED 0x04
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#define NHRP_CODE_INSUFFICIENT_RESOURCES 0x05
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#define NHRP_CODE_NO_BINDING_EXISTS 0x0c
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#define NHRP_CODE_NON_UNIQUE_BINDING 0x0d
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#define NHRP_CODE_ALREADY_REGISTERED 0x0e
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/* NHRP Subnetwork layer address type/length */
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#define NHRP_SHTL_TYPE_MASK 0x40
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#define NHRP_SHTL_LEN_MASK 0x3F
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#define NHRP_SHTL_TYPE(val) (((val) & (NHRP_SHTL_TYPE_MASK)) >> 6)
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#define NHRP_SHTL_LEN(val) ((val) & (NHRP_SHTL_LEN_MASK))
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#define NHRP_SHTL_TYPE_NSAP 0
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#define NHRP_SHTL_TYPE_E164 1
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static const value_string nhrp_shtl_type_vals[] = {
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{ NHRP_SHTL_TYPE_NSAP, "NSAP format" },
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{ NHRP_SHTL_TYPE_E164, "Native E.164 format" },
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{ 0, NULL }
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};
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static const value_string nhrp_op_type_vals[] = {
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{ NHRP_RESOLUTION_REQ, "NHRP Resolution Request" },
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{ NHRP_RESOLUTION_REPLY, "NHRP Resolution Reply" },
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{ NHRP_REGISTRATION_REQ, "NHRP Registration Request" },
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{ NHRP_REGISTRATION_REPLY, "NHRP Registration Reply" },
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{ NHRP_PURGE_REQ, "NHRP Purge Request" },
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{ NHRP_PURGE_REPLY, "NHRP Purge Reply" },
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{ NHRP_ERROR_INDICATION, "NHRP Error Indication" },
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{ NHRP_TRAFFIC_INDICATION, "NHRP Traffic Indication" },
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{ 0, NULL }
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};
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static const value_string ext_type_vals[] = {
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{ NHRP_EXT_NULL, "End of Extension" },
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{ NHRP_EXT_RESP_ADDR, "Responder Address Extension" },
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{ NHRP_EXT_FWD_RECORD, "Forward Transit NHS Record Extension" },
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{ NHRP_EXT_REV_RECORD, "Reverse Transit NHS Record Extension" },
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{ NHRP_EXT_AUTH, "NHRP Authentication Extension" },
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{ NHRP_EXT_VENDOR_PRIV, "NHRP Vendor Private Extension" },
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{ NHRP_EXT_NAT_ADDRESS, "Cisco NAT Address Extension" },
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#if 0 /* Dup (which is handled in the code) */
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{ NHRP_EXT_DEV_CAPABILITIES,"Device Capabilities Extension" },
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#endif
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{ NHRP_EXT_MOBILE_AUTH, "Mobile NHC Authentication Extension" },
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{ 0, NULL }
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};
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static const value_string nhrp_error_code_vals[] = {
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{ NHRP_ERR_UNRECOGNIZED_EXT, "Unrecognized Extension" },
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{ NHRP_ERR_NHRP_LOOP_DETECT, "NHRP Loop Detected" },
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{ NHRP_ERR_PROT_ADDR_UNREACHABLE, "Protocol Address Unreachable" },
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{ NHRP_ERR_PROT_ERROR, "Protocol Error" },
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{ NHRP_ERR_SDU_SIZE_EXCEEDED, "NHRP SDU Size Exceeded" },
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{ NHRP_ERR_INV_EXT, "Invalid Extension" },
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{ NHRP_ERR_INV_RESOLUTION_REPLY, "Invalid NHRP Resolution Reply Received" },
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{ NHRP_ERR_AUTH_FAILURE, "Authentication Failure" },
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{ NHRP_ERR_HOP_COUNT_EXCEEDED, "Hop Count Exceeded" },
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{ NHRP_ERR_VPN_MISMATCH, "VPN Mismatch" },
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{ NHRP_ERR_VPN_UNSUPPORTED, "VPN Unsupported" },
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{ 0, NULL }
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};
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static const value_string nhrp_cie_code_vals[] = {
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{ NHRP_CODE_SUCCESS, "Success" },
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{ NHRP_CODE_ADMIN_PROHIBITED, "Administratively Prohibited" },
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{ NHRP_CODE_INSUFFICIENT_RESOURCES, "Insufficient Resources" },
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{ NHRP_CODE_NO_BINDING_EXISTS, "No Interworking Layer Address to NBMA Address Binding Exists" },
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{ NHRP_CODE_NON_UNIQUE_BINDING, "Binding Exists But Is Not Unique" },
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{ NHRP_CODE_ALREADY_REGISTERED, "Unique Internetworking Layer Address Already Registered" },
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{ 0, NULL }
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};
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static dissector_table_t osinl_incl_subdissector_table;
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static dissector_table_t osinl_excl_subdissector_table;
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static dissector_table_t ethertype_subdissector_table;
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static dissector_handle_t data_handle;
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typedef struct _e_nhrp {
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guint16 ar_afn;
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guint16 ar_pro_type;
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guint32 ar_pro_type_oui;
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guint16 ar_pro_type_pid;
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guint8 ar_hopCnt;
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guint16 ar_pktsz;
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guint16 ar_chksum;
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guint16 ar_extoff;
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guint8 ar_op_version;
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guint8 ar_op_type;
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guint8 ar_shtl;
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guint8 ar_sstl;
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} e_nhrp_hdr;
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static guint16 nhrp_checksum(tvbuff_t *tvb, int len)
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{
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vec_t cksum_vec[1];
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SET_CKSUM_VEC_TVB(cksum_vec[0], tvb, 0, len);
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return in_cksum(&cksum_vec[0], 1);
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}
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static void dissect_nhrp_hdr(tvbuff_t *tvb,
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packet_info *pinfo,
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proto_tree *tree,
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gint *pOffset,
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gint *pMandLen,
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gint *pExtLen,
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oui_info_t **pOuiInfo,
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e_nhrp_hdr *hdr)
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{
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gint offset = *pOffset;
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const gchar *pro_type_str;
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guint total_len = tvb_reported_length(tvb);
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guint16 ipcsum, rx_chksum;
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proto_tree *nhrp_tree;
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proto_item *shtl_tree_item;
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proto_tree *shtl_tree;
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proto_item *sstl_tree_item;
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proto_tree *sstl_tree;
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proto_item *ti;
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nhrp_tree = proto_tree_add_subtree(tree, tvb, offset, 20, ett_nhrp_hdr, NULL, "NHRP Fixed Header");
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hdr->ar_pktsz = tvb_get_ntohs(tvb, 10);
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if (total_len > hdr->ar_pktsz) {
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total_len = hdr->ar_pktsz;
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}
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hdr->ar_afn = tvb_get_ntohs(tvb, offset);
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proto_tree_add_item(nhrp_tree, hf_nhrp_hdr_afn, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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hdr->ar_pro_type = tvb_get_ntohs(tvb, offset);
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if (hdr->ar_pro_type <= 0xFF) {
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/* It's an NLPID */
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pro_type_str = val_to_str_const(hdr->ar_pro_type, nlpid_vals,
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"Unknown NLPID");
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} else if (hdr->ar_pro_type <= 0x3FF) {
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/* Reserved for future use by the IETF */
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pro_type_str = "Reserved for future use by the IETF";
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} else if (hdr->ar_pro_type <= 0x04FF) {
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/* Allocated for use by the ATM Forum */
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pro_type_str = "Allocated for use by the ATM Forum";
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} else if (hdr->ar_pro_type <= 0x05FF) {
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/* Experimental/Local use */
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pro_type_str = "Experimental/Local use";
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} else {
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pro_type_str = val_to_str_const(hdr->ar_pro_type, etype_vals,
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"Unknown Ethertype");
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}
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proto_tree_add_uint_format_value(nhrp_tree, hf_nhrp_hdr_pro_type, tvb, offset, 2,
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hdr->ar_pro_type, "%s (0x%04x)",
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pro_type_str, hdr->ar_pro_type);
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offset += 2;
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if (hdr->ar_pro_type == NLPID_SNAP) {
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/*
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* The long form protocol type is a SNAP OUI and PID.
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*/
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hdr->ar_pro_type_oui = tvb_get_ntoh24(tvb, offset);
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proto_tree_add_uint(nhrp_tree, hf_nhrp_hdr_pro_snap_oui,
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tvb, offset, 3, hdr->ar_pro_type_oui);
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offset += 3;
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hdr->ar_pro_type_pid = tvb_get_ntohs(tvb, offset);
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*pOuiInfo = get_snap_oui_info(hdr->ar_pro_type_oui);
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if (*pOuiInfo != NULL) {
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proto_tree_add_uint(nhrp_tree,
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*(*pOuiInfo)->field_info->p_id,
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tvb, offset, 2, hdr->ar_pro_type_pid);
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} else {
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proto_tree_add_uint(nhrp_tree, hf_nhrp_hdr_pro_snap_pid,
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tvb, offset, 2, hdr->ar_pro_type_pid);
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}
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} else {
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/*
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* XXX - we should check that this is zero, as RFC 2332
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* says it should be zero.
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*/
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_protocol_type, tvb, offset, 5, ENC_NA);
|
|
offset += 5;
|
|
}
|
|
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_hdr_hopcnt, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_hdr_pktsz, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
rx_chksum = tvb_get_ntohs(tvb, offset);
|
|
if (tvb_bytes_exist(tvb, 0, total_len)) {
|
|
ipcsum = nhrp_checksum(tvb, total_len);
|
|
if (ipcsum == 0) {
|
|
proto_tree_add_uint_format_value(nhrp_tree, hf_nhrp_hdr_chksum, tvb, offset, 2, rx_chksum,
|
|
"0x%04x [correct]", rx_chksum);
|
|
} else {
|
|
proto_tree_add_uint_format_value(nhrp_tree, hf_nhrp_hdr_chksum, tvb, offset, 2, rx_chksum,
|
|
"0x%04x [incorrect, should be 0x%04x]", rx_chksum,
|
|
in_cksum_shouldbe(rx_chksum, ipcsum));
|
|
}
|
|
} else {
|
|
proto_tree_add_uint_format_value(nhrp_tree, hf_nhrp_hdr_chksum, tvb, offset, 2, rx_chksum,
|
|
"0x%04x [not all data available]", rx_chksum);
|
|
}
|
|
offset += 2;
|
|
|
|
hdr->ar_extoff = tvb_get_ntohs(tvb, offset);
|
|
ti = proto_tree_add_item(nhrp_tree, hf_nhrp_hdr_extoff, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
if (hdr->ar_extoff != 0 && hdr->ar_extoff < 20) {
|
|
expert_add_info(pinfo, ti, &ei_nhrp_hdr_extoff);
|
|
}
|
|
offset += 2;
|
|
|
|
hdr->ar_op_version = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint_format_value(nhrp_tree, hf_nhrp_hdr_version, tvb, offset, 1,
|
|
hdr->ar_op_version, "%u (%s)", hdr->ar_op_version,
|
|
(hdr->ar_op_version == 1) ? "NHRP - rfc2332" : "Unknown");
|
|
offset += 1;
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_hdr_op_type, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
hdr->ar_shtl = tvb_get_guint8(tvb, offset);
|
|
shtl_tree_item = proto_tree_add_uint_format_value(nhrp_tree, hf_nhrp_hdr_shtl,
|
|
tvb, offset, 1, hdr->ar_shtl, "%s/%u",
|
|
val_to_str_const(NHRP_SHTL_TYPE(hdr->ar_shtl), nhrp_shtl_type_vals, "Unknown Type"),
|
|
NHRP_SHTL_LEN(hdr->ar_shtl));
|
|
shtl_tree = proto_item_add_subtree(shtl_tree_item, ett_nhrp_hdr_shtl);
|
|
proto_tree_add_item(shtl_tree, hf_nhrp_hdr_shtl_type, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(shtl_tree, hf_nhrp_hdr_shtl_len, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
hdr->ar_sstl = tvb_get_guint8(tvb, offset);
|
|
sstl_tree_item = proto_tree_add_uint_format_value(nhrp_tree, hf_nhrp_hdr_sstl,
|
|
tvb, offset, 1, hdr->ar_sstl, "%s/%u",
|
|
val_to_str_const(NHRP_SHTL_TYPE(hdr->ar_sstl), nhrp_shtl_type_vals, "Unknown Type"),
|
|
NHRP_SHTL_LEN(hdr->ar_sstl));
|
|
sstl_tree = proto_item_add_subtree(sstl_tree_item, ett_nhrp_hdr_sstl);
|
|
proto_tree_add_item(sstl_tree, hf_nhrp_hdr_sstl_type, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(sstl_tree, hf_nhrp_hdr_sstl_len, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
*pOffset = offset;
|
|
if (hdr->ar_extoff != 0) {
|
|
if (hdr->ar_extoff >= 20) {
|
|
*pMandLen = hdr->ar_extoff - 20;
|
|
*pExtLen = total_len - hdr->ar_extoff;
|
|
} else {
|
|
/* Error */
|
|
*pMandLen = 0;
|
|
*pExtLen = 0;
|
|
}
|
|
}
|
|
else {
|
|
if (total_len >= 20)
|
|
*pMandLen = total_len - 20;
|
|
else {
|
|
/* "Can't happen" - we would have thrown an exception */
|
|
*pMandLen = 0;
|
|
}
|
|
*pExtLen = 0;
|
|
}
|
|
}
|
|
|
|
static void dissect_cie_list(tvbuff_t *tvb,
|
|
packet_info *pinfo,
|
|
proto_tree *tree,
|
|
gint offset,
|
|
gint cieEnd,
|
|
e_nhrp_hdr *hdr,
|
|
gint isReq,
|
|
gboolean codeinfo)
|
|
{
|
|
proto_item *cli_addr_tree_item;
|
|
proto_tree *cli_addr_tree;
|
|
proto_item *cli_saddr_tree_item;
|
|
proto_tree *cli_saddr_tree;
|
|
guint8 val;
|
|
|
|
while ((offset + 12) <= cieEnd) {
|
|
guint cli_addr_len = tvb_get_guint8(tvb, offset + 8);
|
|
guint cli_saddr_len = tvb_get_guint8(tvb, offset + 9);
|
|
guint cli_prot_len = tvb_get_guint8(tvb, offset + 10);
|
|
guint cie_len = 12 + cli_addr_len + cli_saddr_len + cli_prot_len;
|
|
proto_tree *cie_tree = proto_tree_add_subtree(tree, tvb, offset, cie_len, ett_nhrp_cie, NULL, "Client Information Entry");
|
|
|
|
if (isReq) {
|
|
proto_tree_add_item(cie_tree, hf_nhrp_code, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
else {
|
|
guint8 code = tvb_get_guint8(tvb, offset);
|
|
if ( codeinfo ) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Code=%s",
|
|
val_to_str(code, nhrp_cie_code_vals, "Unknown (%u)"));
|
|
}
|
|
proto_tree_add_item(cie_tree, hf_nhrp_code, tvb, offset, 1, ENC_NA);
|
|
}
|
|
offset += 1;
|
|
|
|
proto_tree_add_item(cie_tree, hf_nhrp_prefix_len, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
proto_tree_add_item(cie_tree, hf_nhrp_unused, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(cie_tree, hf_nhrp_mtu, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(cie_tree, hf_nhrp_holding_time, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
val = tvb_get_guint8(tvb, offset);
|
|
cli_addr_tree_item = proto_tree_add_uint_format_value(cie_tree,
|
|
hf_nhrp_cli_addr_tl, tvb, offset, 1, val, "%s/%u",
|
|
val_to_str_const(NHRP_SHTL_TYPE(val), nhrp_shtl_type_vals, "Unknown Type"),
|
|
NHRP_SHTL_LEN(val));
|
|
cli_addr_tree = proto_item_add_subtree(cli_addr_tree_item, ett_nhrp_cie_cli_addr_tl);
|
|
proto_tree_add_item(cli_addr_tree, hf_nhrp_cli_addr_tl_type, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(cli_addr_tree, hf_nhrp_cli_addr_tl_len, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
val = tvb_get_guint8(tvb, offset);
|
|
cli_saddr_tree_item = proto_tree_add_uint_format_value(cie_tree,
|
|
hf_nhrp_cli_saddr_tl, tvb, offset, 1, val, "%s/%u",
|
|
val_to_str_const(NHRP_SHTL_TYPE(val), nhrp_shtl_type_vals, "Unknown Type"),
|
|
NHRP_SHTL_LEN(val));
|
|
cli_saddr_tree = proto_item_add_subtree(cli_saddr_tree_item, ett_nhrp_cie_cli_saddr_tl);
|
|
proto_tree_add_item(cli_saddr_tree, hf_nhrp_cli_saddr_tl_type, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(cli_saddr_tree, hf_nhrp_cli_saddr_tl_len, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
proto_tree_add_item(cie_tree, hf_nhrp_cli_prot_len, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
proto_tree_add_item(cie_tree, hf_nhrp_pref, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
if (cli_addr_len) {
|
|
switch (hdr->ar_afn) {
|
|
|
|
case AFNUM_INET:
|
|
if (cli_addr_len == 4)
|
|
proto_tree_add_item(cie_tree, hf_nhrp_client_nbma_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
else {
|
|
proto_tree_add_item(cie_tree, hf_nhrp_client_nbma_address_bytes, tvb, offset, cli_addr_len, ENC_NA);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_item(cie_tree, hf_nhrp_client_nbma_address_bytes, tvb, offset, cli_addr_len, ENC_NA);
|
|
break;
|
|
}
|
|
offset += cli_addr_len;
|
|
}
|
|
|
|
if (cli_saddr_len) {
|
|
proto_tree_add_item(cie_tree, hf_nhrp_client_nbma_saddr, tvb, offset, cli_saddr_len, ENC_NA);
|
|
}
|
|
|
|
if (cli_prot_len) {
|
|
if (cli_prot_len == 4)
|
|
proto_tree_add_item(cie_tree, hf_nhrp_client_prot_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
else {
|
|
proto_tree_add_item(cie_tree, hf_nhrp_client_prot_addr_bytes, tvb, offset, cli_prot_len, ENC_NA);
|
|
}
|
|
offset += cli_prot_len;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void dissect_nhrp_mand(tvbuff_t *tvb,
|
|
packet_info *pinfo,
|
|
proto_tree *tree,
|
|
gint *pOffset,
|
|
gint mandLen,
|
|
oui_info_t *oui_info,
|
|
e_nhrp_hdr *hdr,
|
|
guint *srcLen,
|
|
gboolean codeinfo)
|
|
{
|
|
gint offset = *pOffset;
|
|
gint mandEnd = offset + mandLen;
|
|
guint8 ssl, shl;
|
|
guint16 flags;
|
|
guint dstLen;
|
|
gboolean isReq = FALSE;
|
|
gboolean isErr = FALSE;
|
|
gboolean isInd = FALSE;
|
|
|
|
proto_tree *nhrp_tree;
|
|
|
|
switch (hdr->ar_op_type)
|
|
{
|
|
case NHRP_RESOLUTION_REPLY:
|
|
case NHRP_REGISTRATION_REPLY:
|
|
case NHRP_PURGE_REPLY:
|
|
break;
|
|
case NHRP_RESOLUTION_REQ:
|
|
case NHRP_REGISTRATION_REQ:
|
|
case NHRP_PURGE_REQ:
|
|
isReq = TRUE;
|
|
break;
|
|
case NHRP_ERROR_INDICATION: /* This needs special treatment */
|
|
isErr = TRUE;
|
|
isInd = TRUE;
|
|
break;
|
|
case NHRP_TRAFFIC_INDICATION:
|
|
isInd = TRUE;
|
|
break;
|
|
}
|
|
nhrp_tree = proto_tree_add_subtree(tree, tvb, offset, mandLen, ett_nhrp_mand, NULL, "NHRP Mandatory Part");
|
|
|
|
*srcLen = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_src_proto_len, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
dstLen = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_dst_proto_len, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
if (!isInd) {
|
|
proto_item *flag_item;
|
|
proto_tree *flag_tree;
|
|
flags = tvb_get_ntohs(tvb, offset);
|
|
flag_item = proto_tree_add_uint(nhrp_tree, hf_nhrp_flags, tvb, offset, 2, flags);
|
|
flag_tree = proto_item_add_subtree(flag_item, ett_nhrp_mand_flag);
|
|
|
|
switch (hdr->ar_op_type)
|
|
{
|
|
case NHRP_RESOLUTION_REQ:
|
|
case NHRP_RESOLUTION_REPLY:
|
|
proto_tree_add_boolean(flag_tree, hf_nhrp_flag_Q, tvb, offset, 2, flags);
|
|
proto_tree_add_boolean(flag_tree, hf_nhrp_flag_A, tvb, offset, 2, flags);
|
|
proto_tree_add_boolean(flag_tree, hf_nhrp_flag_D, tvb, offset, 2, flags);
|
|
proto_tree_add_boolean(flag_tree, hf_nhrp_flag_U1, tvb, offset, 2, flags);
|
|
proto_tree_add_boolean(flag_tree, hf_nhrp_flag_S, tvb, offset, 2, flags);
|
|
break;
|
|
case NHRP_REGISTRATION_REQ:
|
|
case NHRP_REGISTRATION_REPLY:
|
|
proto_tree_add_boolean(flag_tree, hf_nhrp_flag_U2, tvb, offset, 2, flags);
|
|
break;
|
|
|
|
case NHRP_PURGE_REQ:
|
|
case NHRP_PURGE_REPLY:
|
|
proto_tree_add_boolean(flag_tree, hf_nhrp_flag_N, tvb, offset, 2, flags);
|
|
break;
|
|
}
|
|
proto_tree_add_boolean(flag_tree, hf_nhrp_flag_NAT, tvb, offset, 2, flags);
|
|
|
|
offset += 2;
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", ID=%u", tvb_get_ntohl(tvb, offset));
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_request_id, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
}
|
|
else if (isErr) {
|
|
offset += 2;
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
|
|
val_to_str(tvb_get_ntohs(tvb, offset), nhrp_error_code_vals, "Unknown Error (%u)"));
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_error_code, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_error_offset, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
}
|
|
else {
|
|
offset += 6;
|
|
}
|
|
|
|
shl = NHRP_SHTL_LEN(hdr->ar_shtl);
|
|
if (shl) {
|
|
switch (hdr->ar_afn) {
|
|
|
|
case AFNUM_INET:
|
|
if (shl == 4)
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_src_nbma_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
else {
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_src_nbma_addr_bytes, tvb, offset, shl, ENC_NA);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_src_nbma_addr_bytes, tvb, offset, shl, ENC_NA);
|
|
break;
|
|
}
|
|
offset += shl;
|
|
}
|
|
|
|
ssl = NHRP_SHTL_LEN(hdr->ar_sstl);
|
|
if (ssl) {
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_src_nbma_saddr, tvb, offset, ssl, ENC_NA);
|
|
offset += ssl;
|
|
}
|
|
|
|
if (*srcLen == 4) {
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_src_prot_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
}
|
|
else if (*srcLen) {
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_src_prot_addr_bytes, tvb, offset, *srcLen, ENC_NA);
|
|
offset += *srcLen;
|
|
}
|
|
|
|
if (dstLen == 4) {
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_dst_prot_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
}
|
|
else if (dstLen) {
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_dst_prot_addr_bytes, tvb, offset, dstLen, ENC_NA);
|
|
offset += dstLen;
|
|
}
|
|
|
|
if (isInd) {
|
|
gboolean save_in_error_pkt;
|
|
gint pkt_len = mandEnd - offset;
|
|
proto_tree *ind_tree = proto_tree_add_subtree(tree, tvb, offset, pkt_len, ett_nhrp_indication, NULL, "Packet Causing Indication");
|
|
gboolean dissected;
|
|
tvbuff_t *sub_tvb;
|
|
|
|
save_in_error_pkt = pinfo->flags.in_error_pkt;
|
|
pinfo->flags.in_error_pkt = TRUE;
|
|
sub_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
if (isErr) {
|
|
_dissect_nhrp(sub_tvb, pinfo, ind_tree, TRUE, FALSE);
|
|
}
|
|
else {
|
|
if (hdr->ar_pro_type <= 0xFF) {
|
|
/* It's an NLPID */
|
|
if (hdr->ar_pro_type == NLPID_SNAP) {
|
|
/*
|
|
* Dissect based on the SNAP OUI
|
|
* and PID.
|
|
*/
|
|
if (hdr->ar_pro_type_oui == 0x000000) {
|
|
/*
|
|
* "Should not happen", as
|
|
* the protocol type should
|
|
* be the Ethertype, but....
|
|
*/
|
|
dissected = dissector_try_uint(
|
|
ethertype_subdissector_table,
|
|
hdr->ar_pro_type_pid,
|
|
sub_tvb, pinfo, ind_tree);
|
|
} else {
|
|
/*
|
|
* If we have a dissector
|
|
* table, use it, otherwise
|
|
* just dissect as data.
|
|
*/
|
|
if (oui_info != NULL) {
|
|
dissected = dissector_try_uint(
|
|
oui_info->table,
|
|
hdr->ar_pro_type_pid,
|
|
sub_tvb, pinfo,
|
|
ind_tree);
|
|
} else
|
|
dissected = FALSE;
|
|
}
|
|
} else {
|
|
/*
|
|
* Dissect based on the NLPID.
|
|
*/
|
|
dissected = dissector_try_uint(
|
|
osinl_incl_subdissector_table,
|
|
hdr->ar_pro_type, sub_tvb, pinfo,
|
|
ind_tree) ||
|
|
dissector_try_uint(
|
|
osinl_excl_subdissector_table,
|
|
hdr->ar_pro_type, sub_tvb, pinfo,
|
|
ind_tree);
|
|
}
|
|
} else if (hdr->ar_pro_type <= 0x3FF) {
|
|
/* Reserved for future use by the IETF */
|
|
dissected = FALSE;
|
|
} else if (hdr->ar_pro_type <= 0x04FF) {
|
|
/* Allocated for use by the ATM Forum */
|
|
dissected = FALSE;
|
|
} else if (hdr->ar_pro_type <= 0x05FF) {
|
|
/* Experimental/Local use */
|
|
dissected = FALSE;
|
|
} else {
|
|
dissected = dissector_try_uint(
|
|
ethertype_subdissector_table,
|
|
hdr->ar_pro_type, sub_tvb, pinfo, ind_tree);
|
|
}
|
|
if (!dissected) {
|
|
call_dissector(data_handle, sub_tvb, pinfo,
|
|
ind_tree);
|
|
}
|
|
}
|
|
pinfo->flags.in_error_pkt = save_in_error_pkt;
|
|
offset = mandEnd;
|
|
}
|
|
|
|
/* According to RFC 2332, section 5.2.7, there shouldn't be any extensions
|
|
* in the Error Indication packet. */
|
|
if (isErr && tvb_reported_length_remaining(tvb, offset)) {
|
|
expert_add_info(pinfo, tree, &ei_nhrp_ext_not_allowed);
|
|
}
|
|
|
|
dissect_cie_list(tvb, pinfo, nhrp_tree, offset, mandEnd, hdr, isReq, codeinfo);
|
|
|
|
*pOffset = mandEnd;
|
|
}
|
|
|
|
static void dissect_nhrp_ext(tvbuff_t *tvb,
|
|
packet_info *pinfo,
|
|
proto_tree *tree,
|
|
gint *pOffset,
|
|
gint extLen,
|
|
e_nhrp_hdr *hdr,
|
|
guint srcLen,
|
|
gboolean nested)
|
|
{
|
|
gint offset = *pOffset;
|
|
gint extEnd = offset + extLen;
|
|
|
|
while ((offset + 4) <= extEnd)
|
|
{
|
|
proto_tree *nhrp_tree;
|
|
gint extTypeC = tvb_get_ntohs(tvb, offset);
|
|
gint extType = extTypeC & 0x3FFF;
|
|
guint len = tvb_get_ntohs(tvb, offset+2);
|
|
|
|
if ((extType == NHRP_EXT_NAT_ADDRESS) && (len == 8)) {
|
|
/* Assume it's not really a Cisco NAT extension, but a device
|
|
* capabilities extension instead (see RFC 2735). */
|
|
nhrp_tree = proto_tree_add_subtree(tree, tvb, offset,
|
|
len + 4, ett_nhrp_ext, NULL, "Device Capabilities Extension");
|
|
}
|
|
else {
|
|
nhrp_tree = proto_tree_add_subtree(tree, tvb, offset,
|
|
len + 4, ett_nhrp_ext, NULL,
|
|
val_to_str(extType, ext_type_vals, "Unknown (%u)"));
|
|
}
|
|
proto_tree_add_boolean(nhrp_tree, hf_nhrp_ext_C, tvb, offset, 2, extTypeC);
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_ext_type, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_ext_len, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
if (len && (extType != NHRP_EXT_NULL)) {
|
|
if ((extType == NHRP_EXT_NAT_ADDRESS) && (len == 8)) {
|
|
/* Assume it's not really a Cisco NAT extension, but a device
|
|
* capabilities extension instead (see RFC 2735). */
|
|
proto_tree *devcap_tree;
|
|
proto_item *cap_item;
|
|
proto_tree *cap_tree;
|
|
|
|
devcap_tree = proto_tree_add_subtree_format(nhrp_tree, tvb, offset, len,
|
|
ett_nhrp_devcap_ext, NULL, "Extension Data: Src is %sVPN-aware; Dst is %sVPN-aware",
|
|
tvb_get_ntohl(tvb, offset) & 1 ? "" : "non-",
|
|
tvb_get_ntohl(tvb, offset + 4) & 1 ? "" : "non-");
|
|
cap_item = proto_tree_add_item(devcap_tree, hf_nhrp_devcap_ext_srccap, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
cap_tree = proto_item_add_subtree(cap_item, ett_nhrp_devcap_ext_srccap);
|
|
proto_tree_add_item(cap_tree, hf_nhrp_devcap_ext_srccap_V, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
|
|
cap_item = proto_tree_add_item(devcap_tree, hf_nhrp_devcap_ext_dstcap, tvb, offset + 4, 4, ENC_BIG_ENDIAN);
|
|
cap_tree = proto_item_add_subtree(cap_item, ett_nhrp_devcap_ext_dstcap);
|
|
proto_tree_add_item(cap_tree, hf_nhrp_devcap_ext_dstcap_V, tvb, offset + 4, 4, ENC_BIG_ENDIAN);
|
|
goto skip_switch;
|
|
}
|
|
|
|
switch (extType) {
|
|
case NHRP_EXT_RESP_ADDR:
|
|
case NHRP_EXT_FWD_RECORD:
|
|
case NHRP_EXT_REV_RECORD:
|
|
case NHRP_EXT_NAT_ADDRESS:
|
|
dissect_cie_list(tvb, pinfo, nhrp_tree,
|
|
offset, offset + len, hdr, 0, FALSE);
|
|
break;
|
|
|
|
case NHRP_EXT_AUTH:
|
|
case NHRP_EXT_MOBILE_AUTH:
|
|
if (len < (4 + srcLen)) {
|
|
proto_tree_add_expert_format(nhrp_tree, pinfo, &ei_nhrp_ext_malformed, tvb, offset, len,
|
|
"Incomplete Authentication Extension");
|
|
}
|
|
else {
|
|
proto_tree *auth_tree;
|
|
|
|
auth_tree = proto_tree_add_subtree_format(nhrp_tree, tvb, offset, len,
|
|
ett_nhrp_auth_ext, NULL, "Extension Data: SPI=%u: Data=%s", tvb_get_ntohs(tvb, offset + 2),
|
|
tvb_bytes_to_ep_str(tvb, offset + 4, len - 4));
|
|
proto_tree_add_item(auth_tree, hf_nhrp_auth_ext_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(auth_tree, hf_nhrp_auth_ext_spi, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
|
|
if (srcLen == 4)
|
|
proto_tree_add_item(auth_tree, hf_nhrp_auth_ext_src_addr, tvb, offset + 4, 4, ENC_BIG_ENDIAN);
|
|
else if (srcLen) {
|
|
proto_tree_add_item(auth_tree, hf_nhrp_auth_ext_src_addr_bytes, tvb, offset + 4, srcLen, ENC_NA);
|
|
}
|
|
if (len > (4 + srcLen)) {
|
|
proto_tree_add_item(auth_tree, hf_nhrp_auth_data, tvb, offset + 4 + srcLen, len - (4 + srcLen), ENC_NA);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case NHRP_EXT_VENDOR_PRIV:
|
|
if (len < 3) {
|
|
proto_tree_add_expert_format(nhrp_tree, pinfo, &ei_nhrp_ext_malformed, tvb, offset, len,
|
|
"Incomplete Vendor-Private Extension");
|
|
}
|
|
else {
|
|
proto_tree *vendor_tree;
|
|
gchar manuf[3];
|
|
|
|
tvb_memcpy(tvb, manuf, offset, 3);
|
|
vendor_tree = proto_tree_add_subtree_format(nhrp_tree, tvb, offset, len,
|
|
ett_nhrp_vendor_ext, NULL, "Extension Data: Vendor ID=%s, Data=%s", get_manuf_name(manuf),
|
|
tvb_bytes_to_ep_str(tvb, offset + 3, len - 3));
|
|
proto_tree_add_bytes_format_value(vendor_tree, hf_nhrp_vendor_ext_id, tvb,
|
|
offset, 3, manuf, "%s", get_manuf_name(manuf));
|
|
if (len > 3) {
|
|
proto_tree_add_item(vendor_tree, hf_nhrp_vendor_ext_data, tvb, offset + 3, len - 3, ENC_NA);
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_item(nhrp_tree, hf_nhrp_unknown_ext_value, tvb,
|
|
offset, len, ENC_NA);
|
|
break;
|
|
}
|
|
skip_switch:
|
|
offset += len;
|
|
}
|
|
|
|
if (!nested) {
|
|
len = tvb_reported_length_remaining(tvb, offset);
|
|
if ((extType == NHRP_EXT_NULL) && len) {
|
|
proto_tree_add_expert_format(tree, pinfo, &ei_nhrp_ext_extra, tvb, offset, len,
|
|
"Unknown Data (%d bytes)", len);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
*pOffset = extEnd;
|
|
}
|
|
|
|
static void dissect_nhrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
_dissect_nhrp(tvb, pinfo, tree, FALSE, TRUE);
|
|
}
|
|
|
|
static void _dissect_nhrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
gboolean nested, gboolean codeinfo)
|
|
{
|
|
e_nhrp_hdr hdr;
|
|
gint mandLen = 0;
|
|
gint extLen = 0;
|
|
gint offset = 0;
|
|
proto_item *ti;
|
|
proto_tree *nhrp_tree;
|
|
oui_info_t *oui_info = NULL;
|
|
guint srcLen = 0;
|
|
|
|
if (!nested) {
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "NHRP");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
}
|
|
|
|
memset(&hdr, 0, sizeof(e_nhrp_hdr));
|
|
hdr.ar_op_type = tvb_get_guint8(tvb, 17);
|
|
|
|
if (!nested) {
|
|
col_add_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str(hdr.ar_op_type, nhrp_op_type_vals,
|
|
"0x%02X - unknown"));
|
|
}
|
|
|
|
ti = proto_tree_add_protocol_format(tree, proto_nhrp, tvb, 0, -1,
|
|
"Next Hop Resolution Protocol (%s)",
|
|
val_to_str(hdr.ar_op_type, nhrp_op_type_vals, "0x%02X - unknown"));
|
|
nhrp_tree = proto_item_add_subtree(ti, ett_nhrp);
|
|
|
|
dissect_nhrp_hdr(tvb, pinfo, nhrp_tree, &offset, &mandLen, &extLen,
|
|
&oui_info, &hdr);
|
|
if (mandLen) {
|
|
dissect_nhrp_mand(tvb, pinfo, nhrp_tree, &offset, mandLen,
|
|
oui_info, &hdr, &srcLen, codeinfo);
|
|
}
|
|
|
|
if (extLen) {
|
|
dissect_nhrp_ext(tvb, pinfo, nhrp_tree, &offset, extLen, &hdr, srcLen, nested);
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_nhrp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
|
|
{ &hf_nhrp_hdr_afn,
|
|
{ "Address Family Number", "nhrp.hdr.afn",
|
|
FT_UINT16, BASE_HEX_DEC, VALS(afn_vals), 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_pro_type,
|
|
{ "Protocol Type (short form)", "nhrp.hdr.pro.type",
|
|
FT_UINT16, BASE_HEX_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_pro_snap_oui,
|
|
{ "Protocol Type (long form) - OUI", "nhrp.hdr.pro.snap.oui",
|
|
FT_UINT24, BASE_HEX, VALS(oui_vals), 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_pro_snap_pid,
|
|
{ "Protocol Type (long form) - PID", "nhrp.hdr.pro.snap.pid",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_hopcnt,
|
|
{ "Hop Count", "nhrp.hdr.hopcnt",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_pktsz,
|
|
{ "Packet Length", "nhrp.hdr.pktsz",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_chksum,
|
|
{ "NHRP Packet Checksum", "nhrp.hdr.chksum",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_extoff,
|
|
{ "Extension Offset", "nhrp.hdr.extoff",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_version,
|
|
{ "Version", "nhrp.hdr.version",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_op_type,
|
|
{ "NHRP Packet Type", "nhrp.hdr.op.type",
|
|
FT_UINT8, BASE_DEC, VALS(nhrp_op_type_vals), 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_shtl,
|
|
{ "Source Address Type/Len", "nhrp.hdr.shtl",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_shtl_type,
|
|
{ "Type", "nhrp.hdr.shtl.type",
|
|
FT_UINT8, BASE_DEC, VALS(nhrp_shtl_type_vals), NHRP_SHTL_TYPE_MASK,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_shtl_len,
|
|
{ "Length", "nhrp.hdr.shtl.len",
|
|
FT_UINT8, BASE_DEC, NULL, NHRP_SHTL_LEN_MASK,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_sstl,
|
|
{ "Source SubAddress Type/Len", "nhrp.hdr.sstl",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_sstl_type,
|
|
{ "Type", "nhrp.hdr.sstl.type",
|
|
FT_UINT8, BASE_DEC, VALS(nhrp_shtl_type_vals), NHRP_SHTL_TYPE_MASK,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_hdr_sstl_len,
|
|
{ "Length", "nhrp.hdr.sstl.len",
|
|
FT_UINT8, BASE_DEC, NULL, NHRP_SHTL_LEN_MASK,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_nhrp_src_proto_len,
|
|
{ "Source Protocol Len", "nhrp.src.prot.len",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_dst_proto_len,
|
|
{ "Destination Protocol Len", "nhrp.dst.prot.len",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_flags,
|
|
{ "Flags", "nhrp.flags",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_flag_Q,
|
|
{ "Is Router", "nhrp.flag.q",
|
|
FT_BOOLEAN, 16, NULL, 0x8000,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_flag_N,
|
|
{ "Expected Purge Reply", "nhrp.flag.n",
|
|
FT_BOOLEAN, 16, NULL, 0x8000,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_flag_A,
|
|
{ "Authoritative", "nhrp.flag.a",
|
|
FT_BOOLEAN, 16, NULL, 0x4000,
|
|
"A bit", HFILL }
|
|
},
|
|
{ &hf_nhrp_flag_D,
|
|
{ "Stable Association", "nhrp.flag.d",
|
|
FT_BOOLEAN, 16, NULL, 0x2000,
|
|
"D bit", HFILL }
|
|
},
|
|
{ &hf_nhrp_flag_U1,
|
|
{ "Uniqueness Bit", "nhrp.flag.u",
|
|
FT_BOOLEAN, 16, NULL, 0x1000,
|
|
"U bit", HFILL }
|
|
},
|
|
{ &hf_nhrp_flag_U2,
|
|
{ "Uniqueness Bit", "nhrp.flag.u",
|
|
FT_BOOLEAN, 16, NULL, 0x8000,
|
|
"U bit", HFILL }
|
|
},
|
|
{ &hf_nhrp_flag_S,
|
|
{ "Stable Binding", "nhrp.flag.s",
|
|
FT_BOOLEAN, 16, NULL, 0x0800,
|
|
"S bit", HFILL }
|
|
},
|
|
{ &hf_nhrp_flag_NAT,
|
|
{ "Cisco NAT Supported", "nhrp.flag.nat",
|
|
FT_BOOLEAN, 16, NULL, 0x0002,
|
|
"NAT bit", HFILL }
|
|
},
|
|
{ &hf_nhrp_request_id,
|
|
{ "Request ID", "nhrp.reqid",
|
|
FT_UINT32, BASE_HEX_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_src_nbma_addr,
|
|
{ "Source NBMA Address", "nhrp.src.nbma.addr",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_src_nbma_saddr,
|
|
{ "Source NBMA Sub Address", "nhrp.src.nbma.saddr",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_src_prot_addr,
|
|
{ "Source Protocol Address", "nhrp.src.prot.addr",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_dst_prot_addr,
|
|
{ "Destination Protocol Address", "nhrp.dst.prot.addr",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_nhrp_code,
|
|
{ "Code", "nhrp.code",
|
|
FT_UINT8, BASE_DEC, VALS(nhrp_cie_code_vals), 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_prefix_len,
|
|
{ "Prefix Length", "nhrp.prefix",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_unused,
|
|
{ "Unused", "nhrp.unused",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_mtu,
|
|
{ "Max Transmission Unit", "nhrp.mtu",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_holding_time,
|
|
{ "Holding Time (s)", "nhrp.htime",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_cli_addr_tl,
|
|
{ "Client Address Type/Len", "nhrp.cli.addr_tl",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_cli_addr_tl_type,
|
|
{ "Type", "nhrp.cli.addr_tl.type",
|
|
FT_UINT8, BASE_DEC, VALS(nhrp_shtl_type_vals), NHRP_SHTL_TYPE_MASK,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_cli_addr_tl_len,
|
|
{ "Length", "nhrp.cli.addr_tl.len",
|
|
FT_UINT8, BASE_DEC, NULL, NHRP_SHTL_LEN_MASK,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_cli_saddr_tl,
|
|
{ "Client Sub Address Type/Len", "nhrp.cli.saddr_tl",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_cli_saddr_tl_type,
|
|
{ "Type", "nhrp.cli.saddr_tl.type",
|
|
FT_UINT8, BASE_DEC, VALS(nhrp_shtl_type_vals), NHRP_SHTL_TYPE_MASK,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_cli_saddr_tl_len,
|
|
{ "Length", "nhrp.cli.saddr_tl.len",
|
|
FT_UINT8, BASE_DEC, NULL, NHRP_SHTL_LEN_MASK,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_cli_prot_len,
|
|
{ "Client Protocol Length", "nhrp.prot.len",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_pref,
|
|
{ "CIE Preference Value", "nhrp.pref",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_client_nbma_addr,
|
|
{ "Client NBMA Address", "nhrp.client.nbma.addr",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_client_nbma_saddr,
|
|
{ "Client NBMA Sub Address", "nhrp.client.nbma.saddr",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_client_prot_addr,
|
|
{ "Client Protocol Address", "nhrp.client.prot.addr",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_nhrp_ext_C,
|
|
{ "Compulsory Flag", "nhrp.ext.c",
|
|
FT_BOOLEAN, 16, NULL, 0x8000,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_ext_type,
|
|
{ "Extension Type", "nhrp.ext.type",
|
|
FT_UINT16, BASE_HEX, NULL, 0x3FFF,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_ext_len,
|
|
{ "Extension length", "nhrp.ext.len",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
#if 0
|
|
{ &hf_nhrp_ext_value,
|
|
{ "Extension Value", "nhrp.ext.val",
|
|
FT_UINT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
#endif
|
|
|
|
{ &hf_nhrp_error_code,
|
|
{ "Error Code", "nhrp.err.code",
|
|
FT_UINT16, BASE_DEC, VALS(nhrp_error_code_vals), 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_error_offset,
|
|
{ "Error Offset", "nhrp.err.offset",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
#if 0
|
|
{ &hf_nhrp_error_packet,
|
|
{ "Errored Packet", "nhrp.err.pkt",
|
|
FT_UINT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
#endif
|
|
{ &hf_nhrp_auth_ext_reserved,
|
|
{ "Reserved", "nhrp.auth_ext.reserved",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_auth_ext_spi,
|
|
{ "SPI", "nhrp.auth_ext.spi",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Security Parameter Index", HFILL }
|
|
},
|
|
{ &hf_nhrp_auth_ext_src_addr,
|
|
{ "Source Address", "nhrp.auth_ext.src_addr",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_vendor_ext_id ,
|
|
{ "Vendor ID", "nhrp.vendor_ext.id",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_devcap_ext_srccap,
|
|
{ "Source Capabilities", "nhrp.devcap_ext.srccap",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_devcap_ext_srccap_V,
|
|
{ "VPN-aware", "nhrp.devcap_ext.srccap.V",
|
|
FT_BOOLEAN, 32, NULL, 0x00000001,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_devcap_ext_dstcap,
|
|
{ "Destination Capabilities", "nhrp.devcap_ext.dstcap",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_devcap_ext_dstcap_V,
|
|
{ "VPN-aware", "nhrp.devcap_ext.dstcap.V",
|
|
FT_BOOLEAN, 32, NULL, 0x00000001,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_nhrp_unknown_ext_value,
|
|
{ "Extension Value", "nhrp.unknown_ext.value",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
/* Generated from convert_proto_tree_add_text.pl */
|
|
{ &hf_nhrp_protocol_type, { "Protocol Type (long form)", "nhrp.protocol_type", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_nhrp_client_nbma_address_bytes, { "Client NBMA Address", "nhrp.client.nbma.addr_bytes", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_nhrp_client_prot_addr_bytes, { "Client Protocol Address", "nhrp.client.prot.addr_bytes", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_nhrp_src_nbma_addr_bytes, { "Source NBMA Address", "nhrp.src.nbma.addr_bytes", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_nhrp_src_prot_addr_bytes, { "Source Protocol Address", "nhrp.src.prot.addr_bytes", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_nhrp_dst_prot_addr_bytes, { "Destination Protocol Address", "nhrp.dst.prot.addr_byets", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_nhrp_auth_ext_src_addr_bytes, { "Source Address", "nhrp.auth_ext.src_addr_bytes", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_nhrp_auth_data, { "Data", "nhrp.auth_ext.data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_nhrp_vendor_ext_data, { "Data", "nhrp.vendor_ext.data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_nhrp,
|
|
&ett_nhrp_hdr,
|
|
&ett_nhrp_hdr_shtl,
|
|
&ett_nhrp_hdr_sstl,
|
|
&ett_nhrp_mand,
|
|
&ett_nhrp_ext,
|
|
&ett_nhrp_mand_flag,
|
|
&ett_nhrp_cie,
|
|
&ett_nhrp_cie_cli_addr_tl,
|
|
&ett_nhrp_cie_cli_saddr_tl,
|
|
&ett_nhrp_indication,
|
|
&ett_nhrp_auth_ext,
|
|
&ett_nhrp_vendor_ext,
|
|
&ett_nhrp_devcap_ext,
|
|
&ett_nhrp_devcap_ext_srccap,
|
|
&ett_nhrp_devcap_ext_dstcap
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_nhrp_hdr_extoff, { "nhrp.hdr.extoff.invalid", PI_MALFORMED, PI_ERROR, "Extension offset is less than the fixed header length", EXPFILL }},
|
|
{ &ei_nhrp_ext_not_allowed, { "nhrp.ext.not_allowed", PI_MALFORMED, PI_ERROR, "Extensions not allowed per RFC2332 section 5.2.7", EXPFILL }},
|
|
{ &ei_nhrp_ext_malformed, { "nhrp.ext.malformed", PI_MALFORMED, PI_ERROR, "Incomplete Authentication Extension", EXPFILL }},
|
|
{ &ei_nhrp_ext_extra, { "nhrp.ext.extra", PI_MALFORMED, PI_ERROR, "Superfluous data follows End Extension", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_nhrp;
|
|
|
|
proto_nhrp = proto_register_protocol("NBMA Next Hop Resolution Protocol", "NHRP", "nhrp");
|
|
proto_register_field_array(proto_nhrp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_nhrp = expert_register_protocol(proto_nhrp);
|
|
expert_register_field_array(expert_nhrp, ei, array_length(ei));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_nhrp(void)
|
|
{
|
|
dissector_handle_t nhrp_handle;
|
|
|
|
data_handle = find_dissector("data");
|
|
|
|
osinl_incl_subdissector_table = find_dissector_table("osinl.incl");
|
|
osinl_excl_subdissector_table = find_dissector_table("osinl.excl");
|
|
ethertype_subdissector_table = find_dissector_table("ethertype");
|
|
|
|
nhrp_handle = create_dissector_handle(dissect_nhrp, proto_nhrp);
|
|
dissector_add_uint("ip.proto", IP_PROTO_NARP, nhrp_handle);
|
|
dissector_add_uint("gre.proto", GRE_NHRP, nhrp_handle);
|
|
dissector_add_uint("llc.iana_pid", IANA_PID_MARS_NHRP_CONTROL, nhrp_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|