/* packet-mip.c * Routines for Mobile IP dissection * Copyright 2000, Stefan Raab * * $Id: packet-mip.c,v 1.18 2001/06/18 02:17:49 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #ifdef HAVE_SYS_TYPES_H # include #endif #ifdef HAVE_NETINET_IN_H # include #endif #include #include #include #ifdef NEED_SNPRINTF_H # include "snprintf.h" #endif #include "packet.h" /* Initialize the protocol and registered fields */ static int proto_mip = -1; static int hf_mip_type = -1; static int hf_mip_s = -1; static int hf_mip_b = -1; static int hf_mip_d = -1; static int hf_mip_m = -1; static int hf_mip_g = -1; static int hf_mip_v = -1; static int hf_mip_t = -1; static int hf_mip_code = -1; static int hf_mip_life = -1; static int hf_mip_homeaddr = -1; static int hf_mip_haaddr = -1; static int hf_mip_coa = -1; static int hf_mip_ident = -1; static int hf_mip_ext_type = -1; static int hf_mip_ext_len = -1; static int hf_mip_aext_spi = -1; static int hf_mip_aext_auth = -1; static int hf_mip_next_nai = -1; /* Initialize the subtree pointers */ static gint ett_mip = -1; static gint ett_mip_ext = -1; /* Port used for Mobile IP */ #define UDP_PORT_MIP 434 #define NTP_BASETIME 2208988800ul static const value_string mip_types[] = { {1, "Registration Request"}, {3, "Registration Reply"}, {0, NULL}, }; static const value_string mip_reply_codes[]= { {0, "Reg Accepted"}, {1, "Reg Accepted, but Simultaneous Bindings Unsupported."}, {64, "Reg Deny (FA)- Unspecified Reason"}, {65, "Reg Deny (FA)- Administratively Prohibited"}, {66, "Reg Deny (FA)- Insufficient Resources"}, {67, "Reg Deny (FA)- MN failed Authentication"}, {68, "Reg Deny (FA)- HA failed Authentication"}, {69, "Reg Deny (FA)- Requested Lifetime too Long"}, {70, "Reg Deny (FA)- Poorly Formed Request"}, {71, "Reg Deny (FA)- Poorly Formed Reply"}, {72, "Reg Deny (FA)- Requested Encapsulation Unavailable"}, {73, "Reg Deny (FA)- VJ Compression Unavailable"}, {74, "Reg Deny (FA)- Requested Reverse Tunnel Unavailable"}, {75, "Reg Deny (FA)- Reverse Tunnel is Mandatory and 'T' Bit Not Set"}, {76, "Reg Deny (FA)- Mobile Node Too Distant"}, {79, "Reg Deny (FA)- Delivery Style Not Supported"}, {80, "Reg Deny (FA)- Home Network Unreachable"}, {81, "Reg Deny (FA)- HA Host Unreachable"}, {82, "Reg Deny (FA)- HA Port Unreachable"}, {88, "Reg Deny (FA)- HA Unreachable"}, {96, "Reg Deny (FA)(NAI) - Non Zero Home Address Required"}, {97, "Reg Deny (FA)(NAI) - Missing NAI"}, {98, "Reg Deny (FA)(NAI) - Missing Home Agent"}, {99, "Reg Deny (FA)(NAI) - Missing Home Address"}, {128, "Reg Deny (HA)- Unspecified"}, {129, "Reg Deny (HA)- Administratively Prohibited"}, {130, "Reg Deny (HA)- Insufficient Resources"}, {131, "Reg Deny (HA)- MN Failed Authentication"}, {132, "Reg Deny (HA)- FA Failed Authentication"}, {133, "Reg Deny (HA)- Registration ID Mismatch"}, {134, "Reg Deny (HA)- Poorly Formed Request"}, {135, "Reg Deny (HA)- Too Many Simultaneous Bindings"}, {136, "Reg Deny (HA)- Unknown HA Address"}, {137, "Reg Deny (HA)- Requested Reverse Tunnel Unavailable"}, {138, "Reg Deny (HA)- Reverse Tunnel is Mandatory and 'T' Bit Not Set"}, {139, "Reg Deny (HA)- Requested Encapsulation Unavailable"}, {0, NULL}, }; static const value_string mip_ext_types[]= { {32, "Mobile-Home Authentication Extension"}, {33, "Mobile-Foreign Authentication Extension"}, {34, "Foreign-Home Authentication Extension"}, {131, "Mobile Node NAI Extension"}, {0, NULL}, }; /* Code to actually dissect the packets */ static void dissect_mip( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { /* Set up structures we will need to add the protocol subtree and manage it */ proto_item *ti; proto_tree *mip_tree=NULL, *ext_tree=NULL; guint8 type, code; struct timeval ident_time; int eoffset, elen; /* Make entries in Protocol column and Info column on summary display */ if (check_col(pinfo->fd, COL_PROTOCOL)) col_set_str(pinfo->fd, COL_PROTOCOL, "MobileIP"); if (check_col(pinfo->fd, COL_INFO)) col_clear(pinfo->fd, COL_INFO); type = tvb_get_guint8(tvb, 0); if (type==1) { if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Reg Request: HAddr=%s COA=%s", ip_to_str(tvb_get_ptr(tvb, 4, 4)), ip_to_str(tvb_get_ptr(tvb,12,4))); if (tree) { ti = proto_tree_add_item(tree, proto_mip, tvb, 0, tvb_length(tvb), FALSE); mip_tree = proto_item_add_subtree(ti, ett_mip); proto_tree_add_int(mip_tree, hf_mip_type, tvb, 0, 1, type); code = tvb_get_guint8(tvb, 1); proto_tree_add_boolean(mip_tree, hf_mip_s, tvb, 1, 1, code); proto_tree_add_boolean(mip_tree, hf_mip_b, tvb, 1, 1, code); proto_tree_add_boolean(mip_tree, hf_mip_d, tvb, 1, 1, code); proto_tree_add_boolean(mip_tree, hf_mip_m, tvb, 1, 1, code); proto_tree_add_boolean(mip_tree, hf_mip_g, tvb, 1, 1, code); proto_tree_add_boolean(mip_tree, hf_mip_v, tvb, 1, 1, code); proto_tree_add_boolean(mip_tree, hf_mip_t, tvb, 1, 1, code); proto_tree_add_item(mip_tree, hf_mip_life, tvb, 2, 2, FALSE); proto_tree_add_item(mip_tree, hf_mip_homeaddr, tvb, 4, 4, FALSE); proto_tree_add_item(mip_tree, hf_mip_haaddr, tvb, 8, 4, FALSE); proto_tree_add_item(mip_tree, hf_mip_coa, tvb, 12, 4, FALSE); ident_time.tv_sec = tvb_get_ntohl(tvb,16)-(guint32) NTP_BASETIME; ident_time.tv_usec = tvb_get_ntohl(tvb,20); proto_tree_add_time(mip_tree, hf_mip_ident, tvb, 16, 8, &ident_time); eoffset = 24; while (eoffset < tvb_length(tvb)) { /* Registration Extensions */ if (eoffset ==24) { ti = proto_tree_add_text(mip_tree, tvb, 24, tvb_length(tvb)-24, "Extensions"); ext_tree = proto_item_add_subtree(ti, ett_mip_ext); } proto_tree_add_item(ext_tree, hf_mip_ext_type, tvb, eoffset, 1, FALSE); elen = tvb_get_guint8(tvb, eoffset+1); proto_tree_add_int(ext_tree, hf_mip_ext_len, tvb, eoffset+1, 1, elen); switch (tvb_get_guint8(tvb, eoffset)) { case 32: case 33: case 34: proto_tree_add_item(ext_tree, hf_mip_aext_spi, tvb, eoffset+2, 4, FALSE); proto_tree_add_item(ext_tree, hf_mip_aext_auth, tvb, eoffset+6, elen-4, FALSE); break; case 131: proto_tree_add_string(ext_tree, hf_mip_next_nai, tvb, eoffset+2, tvb_get_guint8(tvb, eoffset+1), tvb_get_ptr(tvb, eoffset+2,tvb_get_guint8(tvb, eoffset+1))); break; default: proto_tree_add_text(ext_tree, tvb, eoffset + 2, tvb_get_guint8(tvb, eoffset+1), "Unknown Extension"); break; } eoffset += tvb_get_guint8(tvb, eoffset+1) + 2; } } } if (type==3){ if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Reg Reply: HAddr=%s, Code=%u", ip_to_str(tvb_get_ptr(tvb,4,4)), tvb_get_guint8(tvb,1)); if (tree) { ti = proto_tree_add_item(tree, proto_mip, tvb, 0, tvb_length(tvb), FALSE); mip_tree = proto_item_add_subtree(ti, ett_mip); proto_tree_add_int(mip_tree, hf_mip_type, tvb, 0, 1, type); /* code = tvb_get_guint8(tvb, 1); proto_tree_add_uint(mip_tree, hf_mip_code, tvb, 1, 1, code);*/ proto_tree_add_item(mip_tree, hf_mip_code, tvb, 1, 1, FALSE); proto_tree_add_item(mip_tree, hf_mip_life, tvb, 2, 2, FALSE); proto_tree_add_item(mip_tree, hf_mip_homeaddr, tvb, 4, 4, FALSE); proto_tree_add_item(mip_tree, hf_mip_haaddr, tvb, 8, 4, FALSE); ident_time.tv_sec = tvb_get_ntohl(tvb,12)-(guint32) NTP_BASETIME; ident_time.tv_usec = tvb_get_ntohl(tvb,16); proto_tree_add_time(mip_tree, hf_mip_ident, tvb, 12, 8, &ident_time); eoffset = 20; while (eoffset < tvb_length(tvb)) { /* Registration Extensions */ if (eoffset==20) { ti = proto_tree_add_text(mip_tree, tvb, 20, tvb_length(tvb)-20, "Extensions"); ext_tree = proto_item_add_subtree(ti, ett_mip_ext); } proto_tree_add_int(ext_tree, hf_mip_ext_type, tvb, eoffset, 1, tvb_get_guint8(tvb, eoffset)); elen = tvb_get_guint8(tvb, eoffset+1); proto_tree_add_int(ext_tree, hf_mip_ext_len, tvb, eoffset+1, 1, elen); switch (tvb_get_guint8(tvb, eoffset)) { case 32: case 33: case 34: proto_tree_add_item(ext_tree, hf_mip_aext_spi, tvb, eoffset+2, 4, FALSE); proto_tree_add_item(ext_tree, hf_mip_aext_auth, tvb, eoffset+6, elen-4, FALSE); break; case 131: proto_tree_add_item(ext_tree, hf_mip_next_nai, tvb, eoffset+2, tvb_get_guint8(tvb, eoffset+1), FALSE); break; default: proto_tree_add_text(ext_tree, tvb, eoffset + 2, tvb_get_guint8(tvb, eoffset+1), "Unknown Extension"); break; } eoffset += tvb_get_guint8(tvb, eoffset+1) + 2; } } } } /* Register the protocol with Ethereal */ void proto_register_mip(void) { /* Setup list of header fields */ static hf_register_info hf[] = { { &hf_mip_type, { "Message Type", "mip.type", FT_INT8, BASE_DEC, VALS(mip_types), 0, "Mobile IP Message type.", HFILL } }, { &hf_mip_s, {"Simultaneous Bindings", "mip.s", FT_BOOLEAN, 8, NULL, 128, "Simultaneous Bindings Allowed", HFILL } }, { &hf_mip_b, {"Broadcast Datagrams", "mip.b", FT_BOOLEAN, 8, NULL, 64, "Broadcast Datagrams requested", HFILL } }, { &hf_mip_d, { "Co-lcated Care-of Address", "mip.d", FT_BOOLEAN, 8, NULL, 32, "MN using Co-located Care-of address", HFILL } }, { &hf_mip_m, {"Minimal Encapsulation", "mip.m", FT_BOOLEAN, 8, NULL, 16, "MN wants Minimal encapsulation", HFILL } }, { &hf_mip_g, {"GRE", "mip.g", FT_BOOLEAN, 8, NULL, 8, "MN wants GRE encapsulation", HFILL } }, { &hf_mip_v, { "Van Jacobson", "mip.v", FT_BOOLEAN, 8, NULL, 4, "Van Jacobson", HFILL } }, { &hf_mip_t, { "Reverse Tunneling", "mip.t", FT_BOOLEAN, 8, NULL, 2, "Reverse tunneling requested", HFILL } }, { &hf_mip_code, { "Reply Code", "mip.code", FT_UINT8, BASE_DEC, VALS(mip_reply_codes), 0, "Mobile IP Reply code.", HFILL } }, { &hf_mip_life, { "Lifetime", "mip.life", FT_UINT16, BASE_DEC, NULL, 0, "Mobile IP Lifetime.", HFILL } }, { &hf_mip_homeaddr, { "Home Address", "mip.homeaddr", 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_INT8, BASE_DEC, VALS(mip_ext_types), 0, "Mobile IP Extension Type.", HFILL } }, { &hf_mip_ext_len, { "Extension Length", "mip.ext.len", FT_INT8, BASE_DEC, NULL, 0, "Mobile IP Extension Length.", HFILL } }, { &hf_mip_aext_spi, { "SPI", "mip.auth.spi", FT_INT32, 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_ext, }; /* Register the protocol name and description */ proto_mip = proto_register_protocol("Mobile IP", "Mobile IP", "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_add("udp.port", UDP_PORT_MIP, dissect_mip, proto_mip); }