2 * Routines for Mobile IP dissection
3 * Copyright 2000, Stefan Raab <sraab@cisco.com>
5 * $Id: packet-mip.c,v 1.26 2002/01/21 07:36:37 guy Exp $
7 * Ethereal - Network traffic analyzer
8 * By Gerald Combs <gerald@ethereal.com>
9 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
33 #ifdef HAVE_SYS_TYPES_H
34 # include <sys/types.h>
37 #ifdef HAVE_NETINET_IN_H
38 # include <netinet/in.h>
45 #ifdef NEED_SNPRINTF_H
46 # include "snprintf.h"
49 #include <epan/packet.h>
51 /* Initialize the protocol and registered fields */
52 static int proto_mip = -1;
53 static int hf_mip_type = -1;
54 static int hf_mip_flags = -1;
55 static int hf_mip_s = -1;
56 static int hf_mip_b = -1;
57 static int hf_mip_d = -1;
58 static int hf_mip_m = -1;
59 static int hf_mip_g = -1;
60 static int hf_mip_v = -1;
61 static int hf_mip_t = -1;
62 static int hf_mip_code = -1;
63 static int hf_mip_life = -1;
64 static int hf_mip_homeaddr = -1;
65 static int hf_mip_haaddr = -1;
66 static int hf_mip_coa = -1;
67 static int hf_mip_ident = -1;
68 static int hf_mip_ext_type = -1;
69 static int hf_mip_ext_stype = -1;
70 static int hf_mip_ext_len = -1;
71 static int hf_mip_ext = -1;
72 static int hf_mip_aext_spi = -1;
73 static int hf_mip_aext_auth = -1;
74 static int hf_mip_next_nai = -1;
76 /* Initialize the subtree pointers */
77 static gint ett_mip = -1;
78 static gint ett_mip_flags = -1;
79 static gint ett_mip_ext = -1;
80 static gint ett_mip_exts = -1;
82 /* Port used for Mobile IP */
83 #define UDP_PORT_MIP 434
84 #define NTP_BASETIME 2208988800ul
87 REGISTRATION_REQUEST = 1,
88 REGISTRATION_REPLY = 3
91 static const value_string mip_types[] = {
92 {REGISTRATION_REQUEST, "Registration Request"},
93 {REGISTRATION_REPLY, "Registration Reply"},
97 static const value_string mip_reply_codes[]= {
99 {1, "Reg Accepted, but Simultaneous Bindings Unsupported."},
100 {64, "Reg Deny (FA)- Unspecified Reason"},
101 {65, "Reg Deny (FA)- Administratively Prohibited"},
102 {66, "Reg Deny (FA)- Insufficient Resources"},
103 {67, "Reg Deny (FA)- MN failed Authentication"},
104 {68, "Reg Deny (FA)- HA failed Authentication"},
105 {69, "Reg Deny (FA)- Requested Lifetime too Long"},
106 {70, "Reg Deny (FA)- Poorly Formed Request"},
107 {71, "Reg Deny (FA)- Poorly Formed Reply"},
108 {72, "Reg Deny (FA)- Requested Encapsulation Unavailable"},
109 {73, "Reg Deny (FA)- VJ Compression Unavailable"},
110 {74, "Reg Deny (FA)- Requested Reverse Tunnel Unavailable"},
111 {75, "Reg Deny (FA)- Reverse Tunnel is Mandatory and 'T' Bit Not Set"},
112 {76, "Reg Deny (FA)- Mobile Node Too Distant"},
113 {79, "Reg Deny (FA)- Delivery Style Not Supported"},
114 {80, "Reg Deny (FA)- Home Network Unreachable"},
115 {81, "Reg Deny (FA)- HA Host Unreachable"},
116 {82, "Reg Deny (FA)- HA Port Unreachable"},
117 {88, "Reg Deny (FA)- HA Unreachable"},
118 {96, "Reg Deny (FA)(NAI) - Non Zero Home Address Required"},
119 {97, "Reg Deny (FA)(NAI) - Missing NAI"},
120 {98, "Reg Deny (FA)(NAI) - Missing Home Agent"},
121 {99, "Reg Deny (FA)(NAI) - Missing Home Address"},
122 {128, "Reg Deny (HA)- Unspecified"},
123 {129, "Reg Deny (HA)- Administratively Prohibited"},
124 {130, "Reg Deny (HA)- Insufficient Resources"},
125 {131, "Reg Deny (HA)- MN Failed Authentication"},
126 {132, "Reg Deny (HA)- FA Failed Authentication"},
127 {133, "Reg Deny (HA)- Registration ID Mismatch"},
128 {134, "Reg Deny (HA)- Poorly Formed Request"},
129 {135, "Reg Deny (HA)- Too Many Simultaneous Bindings"},
130 {136, "Reg Deny (HA)- Unknown HA Address"},
131 {137, "Reg Deny (HA)- Requested Reverse Tunnel Unavailable"},
132 {138, "Reg Deny (HA)- Reverse Tunnel is Mandatory and 'T' Bit Not Set"},
133 {139, "Reg Deny (HA)- Requested Encapsulation Unavailable"},
141 GEN_AUTH_EXT = 36, /* RFC 3012 */
142 OLD_CVSE_EXT = 37, /* RFC 3115 */
143 CVSE_EXT = 38, /* RFC 3115 */
145 MF_CHALLENGE_EXT = 132, /* RFC 3012 */
146 OLD_NVSE_EXT = 133,/* RFC 3115 */
147 NVSE_EXT = 134, /* RFC 3115 */
149 static const value_string mip_ext_types[]= {
150 {MH_AUTH_EXT, "Mobile-Home Authentication Extension"},
151 {MF_AUTH_EXT, "Mobile-Foreign Authentication Extension"},
152 {FH_AUTH_EXT, "Foreign-Home Authentication Extension"},
153 {MN_NAI_EXT, "Mobile Node NAI Extension"},
154 {GEN_AUTH_EXT, "Generalized Mobile-IP Authentication Extension"},
155 {MF_CHALLENGE_EXT, "MN-FA Challenge Extension"},
156 {CVSE_EXT, "Critical Vendor/Organization Specific Extension"},
157 {OLD_CVSE_EXT, "Critical Vendor/Organization Specific Extension"},
158 {NVSE_EXT, "Normal Vendor/Organization Specific Extension"},
159 {OLD_NVSE_EXT, "Normal Vendor/Organization Specific Extension"},
163 static const value_string mip_ext_stypes[]= {
164 {1, "MN AAA Extension"},
167 /* Code to dissect extensions */
169 dissect_mip_extensions( tvbuff_t *tvb, int offset, packet_info *pinfo,
173 proto_tree *exts_tree=NULL;
174 proto_tree *ext_tree;
177 guint8 ext_subtype=0;
180 /* None of this really matters if we don't have a tree */
183 /* Add our tree, if we have extensions */
184 ti = proto_tree_add_text(tree, tvb, offset,
185 tvb_length_remaining(tvb, offset), "Extensions");
186 exts_tree = proto_item_add_subtree(ti, ett_mip_exts);
188 /* And, handle each extension */
189 while (tvb_reported_length_remaining(tvb, offset) > 0) {
191 /* Get our extension info */
192 ext_type = tvb_get_guint8(tvb, offset);
193 if (ext_type == GEN_AUTH_EXT) {
195 * Very nasty . . breaks normal extensions, since the length is
196 * in the wrong place :(
198 ext_subtype = tvb_get_guint8(tvb, offset + 1);
199 ext_len = tvb_get_ntohs(tvb, offset + 2);
202 ext_len = tvb_get_guint8(tvb, offset + 1);
206 ti = proto_tree_add_text(exts_tree, tvb, offset, ext_len + hdrLen,
208 val_to_str(ext_type, mip_ext_types,
209 "Unknown Extension %u"));
210 ext_tree = proto_item_add_subtree(ti, ett_mip_ext);
212 proto_tree_add_item(ext_tree, hf_mip_ext_type, tvb, offset, 1, ext_type);
214 if (ext_type != GEN_AUTH_EXT) {
215 /* Another nasty hack since GEN_AUTH_EXT broke everything */
216 proto_tree_add_uint(ext_tree, hf_mip_ext_len, tvb, offset, 1, ext_len);
224 /* All these extensions look the same. 4 byte SPI followed by a key */
225 proto_tree_add_item(ext_tree, hf_mip_aext_spi, tvb, offset, 4, FALSE);
226 proto_tree_add_item(ext_tree, hf_mip_aext_auth, tvb, offset+4, ext_len-4,
230 proto_tree_add_item(ext_tree, hf_mip_next_nai, tvb, offset,
234 case GEN_AUTH_EXT: /* RFC 3012 */
236 * Very nasty . . breaks normal extensions, since the length is
237 * in the wrong place :(
239 proto_tree_add_uint(ext_tree, hf_mip_ext_stype, tvb, offset, 1, ext_subtype);
241 proto_tree_add_uint(ext_tree, hf_mip_ext_len, tvb, offset, 2, ext_len);
244 proto_tree_add_item(ext_tree, hf_mip_aext_spi, tvb, offset, 4, FALSE);
246 proto_tree_add_item(ext_tree, hf_mip_aext_auth, tvb, offset + 4,
250 case OLD_CVSE_EXT: /* RFC 3115 */
251 case CVSE_EXT: /* RFC 3115 */
252 case OLD_NVSE_EXT: /* RFC 3115 */
253 case NVSE_EXT: /* RFC 3115 */
254 case MF_CHALLENGE_EXT: /* RFC 3012 */
255 /* The default dissector is good here. The challenge is all hex anyway. */
257 proto_tree_add_item(ext_tree, hf_mip_ext, tvb, offset, ext_len, FALSE);
262 } /* while data remaining */
264 } /* dissect_mip_extensions */
266 /* Code to actually dissect the packets */
268 dissect_mip( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
270 /* Set up structures we will need to add the protocol subtree and manage it */
272 proto_tree *mip_tree=NULL;
274 proto_tree *flags_tree;
279 tvbuff_t *extensions_tvb;
280 size_t dataRemaining;
282 /* Make entries in Protocol column and Info column on summary display */
284 if (check_col(pinfo->cinfo, COL_PROTOCOL))
285 col_set_str(pinfo->cinfo, COL_PROTOCOL, "MobileIP");
286 if (check_col(pinfo->cinfo, COL_INFO))
287 col_clear(pinfo->cinfo, COL_INFO);
289 type = tvb_get_guint8(tvb, offset);
291 case REGISTRATION_REQUEST:
292 if (check_col(pinfo->cinfo, COL_INFO))
293 col_add_fstr(pinfo->cinfo, COL_INFO, "Reg Request: HAddr=%s COA=%s",
294 ip_to_str(tvb_get_ptr(tvb, 4, 4)),
295 ip_to_str(tvb_get_ptr(tvb,12,4)));
298 ti = proto_tree_add_item(tree, proto_mip, tvb, offset, tvb_length(tvb), FALSE);
299 mip_tree = proto_item_add_subtree(ti, ett_mip);
302 proto_tree_add_uint(mip_tree, hf_mip_type, tvb, offset, 1, type);
306 flags = tvb_get_guint8(tvb, offset);
307 tf = proto_tree_add_uint(mip_tree, hf_mip_flags, tvb,
309 flags_tree = proto_item_add_subtree(tf, ett_mip_flags);
310 proto_tree_add_boolean(flags_tree, hf_mip_s, tvb, offset, 1, flags);
311 proto_tree_add_boolean(flags_tree, hf_mip_b, tvb, offset, 1, flags);
312 proto_tree_add_boolean(flags_tree, hf_mip_d, tvb, offset, 1, flags);
313 proto_tree_add_boolean(flags_tree, hf_mip_m, tvb, offset, 1, flags);
314 proto_tree_add_boolean(flags_tree, hf_mip_g, tvb, offset, 1, flags);
315 proto_tree_add_boolean(flags_tree, hf_mip_v, tvb, offset, 1, flags);
316 proto_tree_add_boolean(flags_tree, hf_mip_t, tvb, offset, 1, flags);
320 proto_tree_add_item(mip_tree, hf_mip_life, tvb, offset, 2, FALSE);
324 proto_tree_add_item(mip_tree, hf_mip_homeaddr, tvb, offset, 4, FALSE);
327 /* home agent address */
328 proto_tree_add_item(mip_tree, hf_mip_haaddr, tvb, offset, 4, FALSE);
331 /* Care of Address */
332 proto_tree_add_item(mip_tree, hf_mip_coa, tvb, offset, 4, FALSE);
336 ident_time.secs = tvb_get_ntohl(tvb,16)-(guint32) NTP_BASETIME;
337 ident_time.nsecs = tvb_get_ntohl(tvb,20)*1000;
338 proto_tree_add_time(mip_tree, hf_mip_ident, tvb, offset, 8, &ident_time);
343 case REGISTRATION_REPLY:
344 if (check_col(pinfo->cinfo, COL_INFO))
345 col_add_fstr(pinfo->cinfo, COL_INFO, "Reg Reply: HAddr=%s, Code=%u",
346 ip_to_str(tvb_get_ptr(tvb,4,4)), tvb_get_guint8(tvb,1));
350 ti = proto_tree_add_item(tree, proto_mip, tvb, offset, tvb_length(tvb), FALSE);
351 mip_tree = proto_item_add_subtree(ti, ett_mip);
354 proto_tree_add_uint(mip_tree, hf_mip_type, tvb, offset, 1, type);
358 proto_tree_add_item(mip_tree, hf_mip_code, tvb, offset, 1, FALSE);
361 /* Registration Lifetime */
362 proto_tree_add_item(mip_tree, hf_mip_life, tvb, offset, 2, FALSE);
366 proto_tree_add_item(mip_tree, hf_mip_homeaddr, tvb, offset, 4, FALSE);
369 /* Home Agent Address */
370 proto_tree_add_item(mip_tree, hf_mip_haaddr, tvb, offset, 4, FALSE);
374 ident_time.secs = tvb_get_ntohl(tvb,12)-(guint32) NTP_BASETIME;
375 ident_time.nsecs = tvb_get_ntohl(tvb,16)*1000;
376 proto_tree_add_time(mip_tree, hf_mip_ident, tvb, offset, 8, &ident_time);
384 if (tvb_offset_exists(tvb, offset))
385 dissect_mip_extensions(tvb, offset, pinfo, mip_tree);
389 /* Register the protocol with Ethereal */
390 void proto_register_mip(void)
393 /* Setup list of header fields */
394 static hf_register_info hf[] = {
396 { "Message Type", "mip.type",
397 FT_UINT8, BASE_DEC, VALS(mip_types), 0,
398 "Mobile IP Message type.", HFILL }
401 {"Flags", "mip.flags",
402 FT_UINT8, BASE_HEX, NULL, 0x0,
406 {"Simultaneous Bindings", "mip.s",
408 FT_BOOLEAN, 8, NULL, 128,
409 "Simultaneous Bindings Allowed", HFILL }
412 {"Broadcast Datagrams", "mip.b",
413 FT_BOOLEAN, 8, NULL, 64,
414 "Broadcast Datagrams requested", HFILL }
417 { "Co-lcated Care-of Address", "mip.d",
418 FT_BOOLEAN, 8, NULL, 32,
419 "MN using Co-located Care-of address", HFILL }
422 {"Minimal Encapsulation", "mip.m",
423 FT_BOOLEAN, 8, NULL, 16,
424 "MN wants Minimal encapsulation", HFILL }
428 FT_BOOLEAN, 8, NULL, 8,
429 "MN wants GRE encapsulation", HFILL }
432 { "Van Jacobson", "mip.v",
433 FT_BOOLEAN, 8, NULL, 4,
434 "Van Jacobson", HFILL }
437 { "Reverse Tunneling", "mip.t",
438 FT_BOOLEAN, 8, NULL, 2,
439 "Reverse tunneling requested", HFILL }
442 { "Reply Code", "mip.code",
443 FT_UINT8, BASE_DEC, VALS(mip_reply_codes), 0,
444 "Mobile IP Reply code.", HFILL }
447 { "Lifetime", "mip.life",
448 FT_UINT16, BASE_DEC, NULL, 0,
449 "Mobile IP Lifetime.", HFILL }
452 { "Home Address", "mip.homeaddr",
453 FT_IPv4, BASE_NONE, NULL, 0,
454 "Mobile Node's home address.", HFILL }
458 { "Home Agent", "mip.haaddr",
459 FT_IPv4, BASE_NONE, NULL, 0,
460 "Home agent IP Address.", HFILL }
463 { "Care of Address", "mip.coa",
464 FT_IPv4, BASE_NONE, NULL, 0,
465 "Care of Address.", HFILL }
468 { "Identification", "mip.ident",
469 FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0,
470 "MN Identification.", HFILL }
473 { "Extension Type", "mip.ext.type",
474 FT_UINT8, BASE_DEC, VALS(mip_ext_types), 0,
475 "Mobile IP Extension Type.", HFILL }
478 { "Gen Auth Ext SubType", "mip.ext.auth.subtype",
479 FT_UINT8, BASE_DEC, VALS(mip_ext_stypes), 0,
480 "Mobile IP Auth Extension Sub Type.", HFILL }
483 { "Extension Length", "mip.ext.len",
484 FT_UINT16, BASE_DEC, NULL, 0,
485 "Mobile IP Extension Length.", HFILL }
488 { "Extension", "mip.extension",
489 FT_BYTES, BASE_HEX, NULL, 0,
493 { "SPI", "mip.auth.spi",
494 FT_UINT32, BASE_HEX, NULL, 0,
495 "Authentication Header Security Parameter Index.", HFILL }
498 { "Authenticator", "mip.auth.auth",
499 FT_BYTES, BASE_NONE, NULL, 0,
500 "Authenticator.", HFILL }
504 FT_STRING, BASE_NONE, NULL, 0,
509 /* Setup protocol subtree array */
510 static gint *ett[] = {
517 /* Register the protocol name and description */
518 proto_mip = proto_register_protocol("Mobile IP", "Mobile IP", "mip");
520 /* Register the dissector by name */
521 register_dissector("mip", dissect_mip, proto_mip);
523 /* Required function calls to register the header fields and subtrees used */
524 proto_register_field_array(proto_mip, hf, array_length(hf));
525 proto_register_subtree_array(ett, array_length(ett));
529 proto_reg_handoff_mip(void)
531 dissector_handle_t mip_handle;
533 mip_handle = find_dissector("mip");
534 dissector_add("udp.port", UDP_PORT_MIP, mip_handle);