forked from osmocom/wireshark
520 lines
16 KiB
C
520 lines
16 KiB
C
/* packet-mip.c
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* Routines for Mobile IP dissection
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* Copyright 2000, Stefan Raab <sraab@cisco.com>
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*
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* $Id: packet-mip.c,v 1.35 2003/12/21 05:51:33 jmayer Exp $
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <time.h>
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#include <epan/packet.h>
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/* Initialize the protocol and registered fields */
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static int proto_mip = -1;
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static int hf_mip_type = -1;
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static int hf_mip_flags = -1;
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static int hf_mip_s = -1;
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static int hf_mip_b = -1;
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static int hf_mip_d = -1;
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static int hf_mip_m = -1;
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static int hf_mip_g = -1;
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static int hf_mip_v = -1;
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static int hf_mip_t = -1;
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static int hf_mip_code = -1;
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static int hf_mip_life = -1;
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static int hf_mip_homeaddr = -1;
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static int hf_mip_haaddr = -1;
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static int hf_mip_coa = -1;
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static int hf_mip_ident = -1;
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static int hf_mip_ext_type = -1;
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static int hf_mip_ext_stype = -1;
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static int hf_mip_ext_len = -1;
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static int hf_mip_ext = -1;
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static int hf_mip_aext_spi = -1;
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static int hf_mip_aext_auth = -1;
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static int hf_mip_next_nai = -1;
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/* Initialize the subtree pointers */
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static gint ett_mip = -1;
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static gint ett_mip_flags = -1;
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static gint ett_mip_ext = -1;
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static gint ett_mip_exts = -1;
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/* Port used for Mobile IP */
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#define UDP_PORT_MIP 434
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#define NTP_BASETIME 2208988800ul
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typedef enum {
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REGISTRATION_REQUEST = 1,
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REGISTRATION_REPLY = 3
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} mipMessageTypes;
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static const value_string mip_types[] = {
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{REGISTRATION_REQUEST, "Registration Request"},
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{REGISTRATION_REPLY, "Registration Reply"},
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{0, NULL},
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};
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static const value_string mip_reply_codes[]= {
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{0, "Reg Accepted"},
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{1, "Reg Accepted, but Simultaneous Bindings Unsupported."},
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{64, "Reg Deny (FA)- Unspecified Reason"},
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{65, "Reg Deny (FA)- Administratively Prohibited"},
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{66, "Reg Deny (FA)- Insufficient Resources"},
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{67, "Reg Deny (FA)- MN failed Authentication"},
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{68, "Reg Deny (FA)- HA failed Authentication"},
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{69, "Reg Deny (FA)- Requested Lifetime too Long"},
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{70, "Reg Deny (FA)- Poorly Formed Request"},
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{71, "Reg Deny (FA)- Poorly Formed Reply"},
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{72, "Reg Deny (FA)- Requested Encapsulation Unavailable"},
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{73, "Reg Deny (FA)- VJ Compression Unavailable"},
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{74, "Reg Deny (FA)- Requested Reverse Tunnel Unavailable"},
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{75, "Reg Deny (FA)- Reverse Tunnel is Mandatory and 'T' Bit Not Set"},
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{76, "Reg Deny (FA)- Mobile Node Too Distant"},
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{79, "Reg Deny (FA)- Delivery Style Not Supported"},
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{80, "Reg Deny (FA)- Home Network Unreachable"},
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{81, "Reg Deny (FA)- HA Host Unreachable"},
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{82, "Reg Deny (FA)- HA Port Unreachable"},
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{88, "Reg Deny (FA)- HA Unreachable"},
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{96, "Reg Deny (FA)(NAI) - Non Zero Home Address Required"},
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{97, "Reg Deny (FA)(NAI) - Missing NAI"},
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{98, "Reg Deny (FA)(NAI) - Missing Home Agent"},
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{99, "Reg Deny (FA)(NAI) - Missing Home Address"},
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{128, "Reg Deny (HA)- Unspecified"},
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{129, "Reg Deny (HA)- Administratively Prohibited"},
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{130, "Reg Deny (HA)- Insufficient Resources"},
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{131, "Reg Deny (HA)- MN Failed Authentication"},
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{132, "Reg Deny (HA)- FA Failed Authentication"},
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{133, "Reg Deny (HA)- Registration ID Mismatch"},
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{134, "Reg Deny (HA)- Poorly Formed Request"},
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{135, "Reg Deny (HA)- Too Many Simultaneous Bindings"},
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{136, "Reg Deny (HA)- Unknown HA Address"},
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{137, "Reg Deny (HA)- Requested Reverse Tunnel Unavailable"},
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{138, "Reg Deny (HA)- Reverse Tunnel is Mandatory and 'T' Bit Not Set"},
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{139, "Reg Deny (HA)- Requested Encapsulation Unavailable"},
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{0, NULL},
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};
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typedef enum {
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MH_AUTH_EXT = 32,
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MF_AUTH_EXT = 33,
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FH_AUTH_EXT = 34,
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GEN_AUTH_EXT = 36, /* RFC 3012 */
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OLD_CVSE_EXT = 37, /* RFC 3115 */
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CVSE_EXT = 38, /* RFC 3115 */
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MN_NAI_EXT = 131,
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MF_CHALLENGE_EXT = 132, /* RFC 3012 */
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OLD_NVSE_EXT = 133, /* RFC 3115 */
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NVSE_EXT = 134 /* RFC 3115 */
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} MIP_EXTS;
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static const value_string mip_ext_types[]= {
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{MH_AUTH_EXT, "Mobile-Home Authentication Extension"},
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{MF_AUTH_EXT, "Mobile-Foreign Authentication Extension"},
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{FH_AUTH_EXT, "Foreign-Home Authentication Extension"},
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{MN_NAI_EXT, "Mobile Node NAI Extension"},
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{GEN_AUTH_EXT, "Generalized Mobile-IP Authentication Extension"},
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{MF_CHALLENGE_EXT, "MN-FA Challenge Extension"},
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{CVSE_EXT, "Critical Vendor/Organization Specific Extension"},
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{OLD_CVSE_EXT, "Critical Vendor/Organization Specific Extension"},
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{NVSE_EXT, "Normal Vendor/Organization Specific Extension"},
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{OLD_NVSE_EXT, "Normal Vendor/Organization Specific Extension"},
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{0, NULL},
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};
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static const value_string mip_ext_stypes[]= {
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{1, "MN AAA Extension"},
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{0, NULL},
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};
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/* Code to dissect extensions */
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static void
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dissect_mip_extensions( tvbuff_t *tvb, int offset, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *exts_tree=NULL;
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proto_tree *ext_tree;
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size_t ext_len;
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guint8 ext_type;
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guint8 ext_subtype=0;
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size_t hdrLen;
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/* None of this really matters if we don't have a tree */
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if (!tree) return;
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/* Add our tree, if we have extensions */
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ti = proto_tree_add_text(tree, tvb, offset, -1, "Extensions");
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exts_tree = proto_item_add_subtree(ti, ett_mip_exts);
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/* And, handle each extension */
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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/* Get our extension info */
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ext_type = tvb_get_guint8(tvb, offset);
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if (ext_type == GEN_AUTH_EXT) {
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/*
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* Very nasty . . breaks normal extensions, since the length is
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* in the wrong place :(
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*/
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ext_subtype = tvb_get_guint8(tvb, offset + 1);
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ext_len = tvb_get_ntohs(tvb, offset + 2);
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hdrLen = 4;
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} else {
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ext_len = tvb_get_guint8(tvb, offset + 1);
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hdrLen = 2;
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}
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ti = proto_tree_add_text(exts_tree, tvb, offset, ext_len + hdrLen,
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"Extension: %s",
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val_to_str(ext_type, mip_ext_types,
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"Unknown Extension %u"));
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ext_tree = proto_item_add_subtree(ti, ett_mip_ext);
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proto_tree_add_item(ext_tree, hf_mip_ext_type, tvb, offset, 1, ext_type);
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offset++;
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if (ext_type != GEN_AUTH_EXT) {
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/* Another nasty hack since GEN_AUTH_EXT broke everything */
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proto_tree_add_uint(ext_tree, hf_mip_ext_len, tvb, offset, 1, ext_len);
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offset++;
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}
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switch(ext_type) {
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case MH_AUTH_EXT:
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case MF_AUTH_EXT:
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case FH_AUTH_EXT:
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/* All these extensions look the same. 4 byte SPI followed by a key */
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proto_tree_add_item(ext_tree, hf_mip_aext_spi, tvb, offset, 4, FALSE);
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proto_tree_add_item(ext_tree, hf_mip_aext_auth, tvb, offset+4, ext_len-4,
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FALSE);
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break;
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case MN_NAI_EXT:
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proto_tree_add_item(ext_tree, hf_mip_next_nai, tvb, offset,
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ext_len, FALSE);
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break;
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case GEN_AUTH_EXT: /* RFC 3012 */
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/*
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* Very nasty . . breaks normal extensions, since the length is
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* in the wrong place :(
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*/
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proto_tree_add_uint(ext_tree, hf_mip_ext_stype, tvb, offset, 1, ext_subtype);
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offset++;
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proto_tree_add_uint(ext_tree, hf_mip_ext_len, tvb, offset, 2, ext_len);
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offset+=2;
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/* SPI */
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proto_tree_add_item(ext_tree, hf_mip_aext_spi, tvb, offset, 4, FALSE);
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/* Key */
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proto_tree_add_item(ext_tree, hf_mip_aext_auth, tvb, offset + 4,
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ext_len - 4, FALSE);
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break;
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case OLD_CVSE_EXT: /* RFC 3115 */
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case CVSE_EXT: /* RFC 3115 */
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case OLD_NVSE_EXT: /* RFC 3115 */
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case NVSE_EXT: /* RFC 3115 */
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case MF_CHALLENGE_EXT: /* RFC 3012 */
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/* The default dissector is good here. The challenge is all hex anyway. */
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default:
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proto_tree_add_item(ext_tree, hf_mip_ext, tvb, offset, ext_len, FALSE);
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break;
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} /* ext type */
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offset += ext_len;
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} /* while data remaining */
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} /* dissect_mip_extensions */
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/* Code to actually dissect the packets */
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static void
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dissect_mip( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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/* Set up structures we will need to add the protocol subtree and manage it */
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proto_item *ti;
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proto_tree *mip_tree=NULL;
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proto_item *tf;
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proto_tree *flags_tree;
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guint8 type;
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guint8 flags;
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nstime_t ident_time;
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size_t offset=0;
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/* Make entries in Protocol column and Info column on summary display */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MobileIP");
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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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type = tvb_get_guint8(tvb, offset);
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switch (type) {
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case REGISTRATION_REQUEST:
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO, "Reg Request: HAddr=%s COA=%s",
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ip_to_str(tvb_get_ptr(tvb, 4, 4)),
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ip_to_str(tvb_get_ptr(tvb,12,4)));
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if (tree) {
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ti = proto_tree_add_item(tree, proto_mip, tvb, offset, -1, FALSE);
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mip_tree = proto_item_add_subtree(ti, ett_mip);
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/* type */
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proto_tree_add_uint(mip_tree, hf_mip_type, tvb, offset, 1, type);
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offset++;
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/* flags */
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flags = tvb_get_guint8(tvb, offset);
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tf = proto_tree_add_uint(mip_tree, hf_mip_flags, tvb,
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offset, 1, flags);
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flags_tree = proto_item_add_subtree(tf, ett_mip_flags);
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proto_tree_add_boolean(flags_tree, hf_mip_s, tvb, offset, 1, flags);
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proto_tree_add_boolean(flags_tree, hf_mip_b, tvb, offset, 1, flags);
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proto_tree_add_boolean(flags_tree, hf_mip_d, tvb, offset, 1, flags);
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proto_tree_add_boolean(flags_tree, hf_mip_m, tvb, offset, 1, flags);
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proto_tree_add_boolean(flags_tree, hf_mip_g, tvb, offset, 1, flags);
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proto_tree_add_boolean(flags_tree, hf_mip_v, tvb, offset, 1, flags);
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proto_tree_add_boolean(flags_tree, hf_mip_t, tvb, offset, 1, flags);
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offset++;
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/* lifetime */
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proto_tree_add_item(mip_tree, hf_mip_life, tvb, offset, 2, FALSE);
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offset +=2;
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/* home address */
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proto_tree_add_item(mip_tree, hf_mip_homeaddr, tvb, offset, 4, FALSE);
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offset += 4;
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/* home agent address */
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proto_tree_add_item(mip_tree, hf_mip_haaddr, tvb, offset, 4, FALSE);
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offset += 4;
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/* Care of Address */
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proto_tree_add_item(mip_tree, hf_mip_coa, tvb, offset, 4, FALSE);
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offset += 4;
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/* Identifier */
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ident_time.secs = tvb_get_ntohl(tvb,16)-(guint32) NTP_BASETIME;
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ident_time.nsecs = tvb_get_ntohl(tvb,20)*1000;
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proto_tree_add_time(mip_tree, hf_mip_ident, tvb, offset, 8, &ident_time);
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offset += 8;
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} /* if tree */
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break;
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case REGISTRATION_REPLY:
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO, "Reg Reply: HAddr=%s, Code=%u",
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ip_to_str(tvb_get_ptr(tvb,4,4)), tvb_get_guint8(tvb,1));
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if (tree) {
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/* Add Subtree */
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ti = proto_tree_add_item(tree, proto_mip, tvb, offset, -1, FALSE);
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mip_tree = proto_item_add_subtree(ti, ett_mip);
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/* Type */
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proto_tree_add_uint(mip_tree, hf_mip_type, tvb, offset, 1, type);
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offset++;
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/* Reply Code */
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proto_tree_add_item(mip_tree, hf_mip_code, tvb, offset, 1, FALSE);
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offset++;
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/* Registration Lifetime */
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proto_tree_add_item(mip_tree, hf_mip_life, tvb, offset, 2, FALSE);
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offset += 2;
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/* Home address */
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proto_tree_add_item(mip_tree, hf_mip_homeaddr, tvb, offset, 4, FALSE);
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offset += 4;
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/* Home Agent Address */
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proto_tree_add_item(mip_tree, hf_mip_haaddr, tvb, offset, 4, FALSE);
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offset += 4;
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/* Identifier */
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ident_time.secs = tvb_get_ntohl(tvb,12)-(guint32) NTP_BASETIME;
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ident_time.nsecs = tvb_get_ntohl(tvb,16)*1000;
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proto_tree_add_time(mip_tree, hf_mip_ident, tvb, offset, 8, &ident_time);
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offset += 8;
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} /* if tree */
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break;
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} /* End switch */
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if (tree) {
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if (tvb_reported_length_remaining(tvb, offset) > 0)
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dissect_mip_extensions(tvb, offset, mip_tree);
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}
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} /* dissect_mip */
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/* Register the protocol with Ethereal */
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void proto_register_mip(void)
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{
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/* Setup list of header fields */
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static hf_register_info hf[] = {
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{ &hf_mip_type,
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{ "Message Type", "mip.type",
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FT_UINT8, BASE_DEC, VALS(mip_types), 0,
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"Mobile IP Message type.", HFILL }
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},
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{ &hf_mip_flags,
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{"Flags", "mip.flags",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"", HFILL}
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},
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{ &hf_mip_s,
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{"Simultaneous Bindings", "mip.s",
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FT_BOOLEAN, 8, NULL, 128,
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"Simultaneous Bindings Allowed", HFILL }
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},
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{ &hf_mip_b,
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{"Broadcast Datagrams", "mip.b",
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FT_BOOLEAN, 8, NULL, 64,
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"Broadcast Datagrams requested", HFILL }
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},
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{ &hf_mip_d,
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{ "Co-lcated Care-of Address", "mip.d",
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FT_BOOLEAN, 8, NULL, 32,
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"MN using Co-located Care-of address", HFILL }
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},
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{ &hf_mip_m,
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{"Minimal Encapsulation", "mip.m",
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FT_BOOLEAN, 8, NULL, 16,
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"MN wants Minimal encapsulation", HFILL }
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},
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{ &hf_mip_g,
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{"GRE", "mip.g",
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FT_BOOLEAN, 8, NULL, 8,
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"MN wants GRE encapsulation", HFILL }
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},
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{ &hf_mip_v,
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{ "Van Jacobson", "mip.v",
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FT_BOOLEAN, 8, NULL, 4,
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"Van Jacobson", HFILL }
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},
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{ &hf_mip_t,
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{ "Reverse Tunneling", "mip.t",
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FT_BOOLEAN, 8, NULL, 2,
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"Reverse tunneling requested", HFILL }
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},
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{ &hf_mip_code,
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{ "Reply Code", "mip.code",
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FT_UINT8, BASE_DEC, VALS(mip_reply_codes), 0,
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"Mobile IP Reply code.", HFILL }
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},
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{ &hf_mip_life,
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{ "Lifetime", "mip.life",
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FT_UINT16, BASE_DEC, NULL, 0,
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"Mobile IP Lifetime.", HFILL }
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},
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{ &hf_mip_homeaddr,
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{ "Home Address", "mip.homeaddr",
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FT_IPv4, BASE_NONE, NULL, 0,
|
|
"Mobile Node's home address.", HFILL }
|
|
},
|
|
|
|
{ &hf_mip_haaddr,
|
|
{ "Home Agent", "mip.haaddr",
|
|
FT_IPv4, BASE_NONE, NULL, 0,
|
|
"Home agent IP Address.", HFILL }
|
|
},
|
|
{ &hf_mip_coa,
|
|
{ "Care of Address", "mip.coa",
|
|
FT_IPv4, BASE_NONE, NULL, 0,
|
|
"Care of Address.", HFILL }
|
|
},
|
|
{ &hf_mip_ident,
|
|
{ "Identification", "mip.ident",
|
|
FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0,
|
|
"MN Identification.", HFILL }
|
|
},
|
|
{ &hf_mip_ext_type,
|
|
{ "Extension Type", "mip.ext.type",
|
|
FT_UINT8, BASE_DEC, VALS(mip_ext_types), 0,
|
|
"Mobile IP Extension Type.", HFILL }
|
|
},
|
|
{ &hf_mip_ext_stype,
|
|
{ "Gen Auth Ext SubType", "mip.ext.auth.subtype",
|
|
FT_UINT8, BASE_DEC, VALS(mip_ext_stypes), 0,
|
|
"Mobile IP Auth Extension Sub Type.", HFILL }
|
|
},
|
|
{ &hf_mip_ext_len,
|
|
{ "Extension Length", "mip.ext.len",
|
|
FT_UINT16, BASE_DEC, NULL, 0,
|
|
"Mobile IP Extension Length.", HFILL }
|
|
},
|
|
{ &hf_mip_ext,
|
|
{ "Extension", "mip.extension",
|
|
FT_BYTES, BASE_HEX, NULL, 0,
|
|
"Extension", HFILL }
|
|
},
|
|
{ &hf_mip_aext_spi,
|
|
{ "SPI", "mip.auth.spi",
|
|
FT_UINT32, BASE_HEX, NULL, 0,
|
|
"Authentication Header Security Parameter Index.", HFILL }
|
|
},
|
|
{ &hf_mip_aext_auth,
|
|
{ "Authenticator", "mip.auth.auth",
|
|
FT_BYTES, BASE_NONE, NULL, 0,
|
|
"Authenticator.", HFILL }
|
|
},
|
|
{ &hf_mip_next_nai,
|
|
{ "NAI", "mip.nai",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
"NAI", HFILL }
|
|
},
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_mip,
|
|
&ett_mip_flags,
|
|
&ett_mip_ext,
|
|
&ett_mip_exts,
|
|
};
|
|
|
|
/* Register the protocol name and description */
|
|
proto_mip = proto_register_protocol("Mobile IP", "Mobile IP", "mip");
|
|
|
|
/* Register the dissector by name */
|
|
register_dissector("mip", dissect_mip, proto_mip);
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array(proto_mip, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_mip(void)
|
|
{
|
|
dissector_handle_t mip_handle;
|
|
|
|
mip_handle = find_dissector("mip");
|
|
dissector_add("udp.port", UDP_PORT_MIP, mip_handle);
|
|
}
|