/* packet-mip.c * Routines for Mobile IP dissection * Copyright 2000, Stefan Raab * * $Id: packet-mip.c,v 1.1 2000/05/27 13:53:26 gram Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * Copied from WHATEVER_FILE_YOU_USED * * 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 #ifdef NEED_SNPRINTF_H # ifdef HAVE_STDARG_H # include # else # include # endif # include "snprintf.h" #endif #include #include #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_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; /* Initialize the subtree pointers */ static gint ett_mip = -1; /* Port used for Mobile IP */ #define UDP_PORT_MIP 434 /* struct mip_packet{ unsigned char type; }; struct mip_request_packet{ unsigned char type; unsigned char code; unsigned char life[2]; unsigned char homeaddr[4]; unsigned char haaddr[4]; unsigned char coa[4]; unsigned char ident[8]; }; struct mip_reply_packet{ unsigned char type; unsigned char code; unsigned char life[2]; unsigned char homeaddr[4]; unsigned char haaddr[4]; unsigned char ident[8]; }; */ static const value_string mip_types[] = { {1, "Registration Request"}, {3, "Registration Reply"} }; static const value_string mip_reply_codes[]= { {0, "Registration Accepted"}, {1, "Registration Accepted, no simul bindings"}, {64, "Registration Denied by FA, unspecified reason"}, {65, "Registration Denied by FA, Admin Prohibit"}, {66, "Registration Denied by FA, Insufficient Resources"}, {67, "Registration Denied by FA, MN failed Auth"}, {68, "Registration Denied by FA, HA failed Auth"}, {69, "Registration Denied by FA, Lifetime to long"}, {70, "Registration Denied by FA, Poorly Formed Request"}, {71, "Registration Denied by FA, Poorly Formed Reply"}, {72, "Registration Denied by FA, encap unavailable"}, {73, "Registration Denied by FA, VJ unavailable"}, {80, "Registration Denied by FA, Home net unreachable"}, {81, "Registration Denied by FA, Home Agent host unreachable"}, {82, "Registration Denied by FA, Home Agent port unreachable"}, {88, "Registration Denied by FA, Home Agent unreachable"}, {128, "Registration Denied by HA, unspecified"}, {129, "Registration Denied by HA, Admin Prohibit"}, {130, "Registration Denied by HA, insufficient resources"}, {131, "Registration Denied by HA, MN failed Auth"}, {132, "Registration Denied by HA, FA failed Auth"}, {133, "Registration Denied by HA, registration ID Mismatch"}, {134, "Registration Denied by HA, poorly formed request"}, {135, "Registration Denied by HA, too many simul bindings"}, {136, "Registration Denied by HA, unknown HA address"}, }; /* Code to actually dissect the packets */ static void dissect_mip(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) { /* Set up structures we will need to add the protocol subtree and manage it */ proto_item *ti; proto_tree *mip_tree; guint8 type, code; /* Make our own tvb until the function call includes one */ tvbuff_t *tvb; packet_info *pinfo = π tvb = tvb_new_subset(pi.compat_top_tvb, offset, -1, -1); /* Make entries in Protocol column and Info column on summary display */ pinfo->current_proto = "Mobile IP"; if (check_col(fd, COL_PROTOCOL)) col_add_str(fd, COL_PROTOCOL, "mip"); type = tvb_get_guint8(tvb, 0); /* This field shows up as the "Info" column in the display; you should make it, if possible, summarize what's in the packet, so that a user looking at the list of packets can tell what type of packet it is. "col_add_fstr()" can be used instead of "col_add_str()"; it takes "printf()"-like arguments. */ if (type==1) { if (check_col(fd, COL_INFO)) col_add_str(fd, COL_INFO, "Mobile IP Registration Request"); if (tree) { ti = proto_tree_add_item(tree, proto_mip, tvb, 0, END_OF_FRAME, NULL); mip_tree = proto_item_add_subtree(ti, ett_mip); proto_tree_add_item(mip_tree, hf_mip_type, 0, 1, type); code = tvb_get_guint8(tvb, 1); proto_tree_add_item(mip_tree, hf_mip_s, tvb, 1, 1, code); proto_tree_add_item(mip_tree, hf_mip_b, tvb, 1, 1, code); proto_tree_add_item(mip_tree, hf_mip_d, tvb, 1, 1, code); proto_tree_add_item(mip_tree, hf_mip_m, tvb, 1, 1, code); proto_tree_add_item(mip_tree, hf_mip_g, tvb, 1, 1, code); proto_tree_add_item(mip_tree, hf_mip_v, tvb, 1, 1, code); proto_tree_add_item(mip_tree, hf_mip_life, tvb, 2, 2, tvb_get_ntohs(tvb, 2)); proto_tree_add_item(mip_tree, hf_mip_homeaddr, tvb, 4, 4, tvb_get_letohl(tvb, 4)); proto_tree_add_item(mip_tree, hf_mip_haaddr, tvb, 8, 4, tvb_get_letohl(tvb, 8)); proto_tree_add_item(mip_tree, hf_mip_coa, tvb, 12, 4, tvb_get_letohl(tvb, 12)); proto_tree_add_item(mip_tree, hf_mip_ident, tvb, 16, 8, tvb_get_ptr(tvb, 16, 8)); } } if (type==3){ if (check_col(fd, COL_INFO)) col_add_str(fd, COL_INFO, "Mobile IP Registration Reply"); /* In the interest of speed, if "tree" is NULL, don't do any work not necessary to generate protocol tree items. */ if (tree) { ti = proto_tree_add_item(tree, proto_mip, tvb, 0, END_OF_FRAME, NULL); mip_tree = proto_item_add_subtree(ti, ett_mip); proto_tree_add_item(mip_tree, hf_mip_type, tvb, 0, 1, type); code = tvb_get_guint8(tvb, 1); proto_tree_add_item(mip_tree, hf_mip_code, tvb, 1, 1, code); proto_tree_add_item(mip_tree, hf_mip_life, tvb, 2, 2, tvb_get_ntohs(tvb, 2)); proto_tree_add_item(mip_tree, hf_mip_homeaddr, tvb, 4, 4, tvb_get_letohl(tvb, 4)); proto_tree_add_item(mip_tree, hf_mip_haaddr, tvb, 8, 4, tvb_get_letohl(tvb, 8)); proto_tree_add_item(mip_tree, hf_mip_ident, tvb, 12, 8, tvb_get_ptr(tvb, 12, 8)); } } } /* 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." } }, { &hf_mip_s, {"Simultaneous Bindings", "mip.s", FT_BOOLEAN, 8, NULL, 128, "Simultaneous Bindings Allowed" } }, { &hf_mip_b, {"Broadcast Datagrams", "mip.b", FT_BOOLEAN, 8, NULL, 64, "Broadcast Datagrams requested" } }, { &hf_mip_d, { "Co-lcated Care-of Address", "mip.d", FT_BOOLEAN, 8, NULL, 32, "MN using Co-located Care-of address" } }, { &hf_mip_m, {"Minimal Encapsulation", "mip.m", FT_BOOLEAN, 8, NULL, 16, "MN wants Minimal encapsulation" } }, { &hf_mip_g, {"GRE", "mip.g", FT_BOOLEAN, 8, NULL, 8, "MN wants GRE encapsulation" } }, { &hf_mip_v, { "Van Jacobson", "mip.v", FT_BOOLEAN, 8, NULL, 4, "Van Jacbson" } }, { &hf_mip_code, { "Reply Code", "mip.code", FT_UINT8, BASE_DEC, VALS(mip_reply_codes), 0, "Mobile IP Reply code." } }, { &hf_mip_life, { "Lifetime", "mip.life", FT_INT16, BASE_DEC, NULL, 0, "Mobile IP Lifetime." } }, { &hf_mip_homeaddr, { "Home Address", "mip.homeaddr", FT_IPv4, BASE_NONE, NULL, 0, "Mobile Nodes home address." } }, { &hf_mip_haaddr, { "Home Agent", "mip.haaddr", FT_IPv4, BASE_NONE, NULL, 0, "Home agent Ip Address." } }, { &hf_mip_coa, { "Care of Address", "mip.coa", FT_IPv4, BASE_NONE, NULL, 0, "Care of Address." } }, { &hf_mip_ident, { "Identification", "mip.ident", FT_BYTES, BASE_NONE, NULL, 0, "MN Identification." } }, }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_mip, }; /* Register the protocol name and description */ proto_mip = proto_register_protocol("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); }