/* packet-mtp3.c * Routines for Message Transfer Part Level 3 dissection * * It is (hopefully) compliant to: * ANSI T1.111.4-1996 * ITU-T Q.704 7/1996 * GF 001-9001 (Chinese ITU variant) * JT-Q704 and NTT-Q704 (Japan) * * Note that the division of the Japan SLS into the SLC and A/B bit (for * management messages) is not done. * * Copyright 2001, Michael Tuexen * Updated for ANSI, Chinese ITU, and Japan support by * Jeff Morriss * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * Copied from README.developer * * 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 #include #include #include #include #include "packet-q708.h" /* Initialize the protocol and registered fields */ static int proto_mtp3 = -1; static int mtp3_tap = -1; static module_t *mtp3_module; static int hf_mtp3_service_indicator = -1; static int hf_mtp3_network_indicator = -1; static int hf_mtp3_itu_spare = -1; static int hf_mtp3_itu_priority = -1; static int hf_mtp3_ansi_priority = -1; static int hf_mtp3_itu_pc = -1; static int hf_mtp3_24bit_pc = -1; static int hf_mtp3_itu_opc = -1; static int hf_mtp3_24bit_opc = -1; static int hf_mtp3_ansi_opc = -1; static int hf_mtp3_chinese_opc = -1; static int hf_mtp3_opc_network = -1; static int hf_mtp3_opc_cluster = -1; static int hf_mtp3_opc_member = -1; static int hf_mtp3_itu_dpc = -1; static int hf_mtp3_24bit_dpc = -1; static int hf_mtp3_ansi_dpc = -1; static int hf_mtp3_chinese_dpc = -1; static int hf_mtp3_dpc_network = -1; static int hf_mtp3_dpc_cluster = -1; static int hf_mtp3_dpc_member = -1; static int hf_mtp3_itu_sls = -1; static int hf_mtp3_ansi_5_bit_sls = -1; static int hf_mtp3_ansi_8_bit_sls = -1; static int hf_mtp3_chinese_itu_sls = -1; static int hf_mtp3_japan_dpc = -1; static int hf_mtp3_japan_opc = -1; static int hf_mtp3_japan_pc = -1; static int hf_mtp3_japan_4_bit_sls = -1; static int hf_mtp3_japan_4_bit_sls_spare = -1; static int hf_mtp3_japan_5_bit_sls = -1; static int hf_mtp3_japan_5_bit_sls_spare = -1; /* Initialize the subtree pointers */ static gint ett_mtp3 = -1; static gint ett_mtp3_sio = -1; static gint ett_mtp3_label = -1; static gint ett_mtp3_label_dpc = -1; static gint ett_mtp3_label_opc = -1; static dissector_table_t mtp3_sio_dissector_table; typedef enum { ITU_PC_STRUCTURE_NONE = 1, ITU_PC_STRUCTURE_3_8_3 = 2, ITU_PC_STRUCTURE_4_3_4_3 = 3 } ITU_PC_Structure_Type; typedef enum { JAPAN_PC_STRUCTURE_NONE = 1, JAPAN_PC_STRUCTURE_7_4_5 = 2, JAPAN_PC_STRUCTURE_3_4_4_5 = 3 } JAPAN_PC_Structure_Type; static gint itu_pc_structure = ITU_PC_STRUCTURE_NONE; static gint japan_pc_structure = JAPAN_PC_STRUCTURE_NONE; #include gint mtp3_standard = ITU_STANDARD; static gboolean mtp3_use_ansi_5_bit_sls = FALSE; static gboolean mtp3_use_japan_5_bit_sls = FALSE; static gboolean mtp3_show_itu_priority = FALSE; static gint mtp3_addr_fmt = MTP3_ADDR_FMT_DASHED; static mtp3_addr_pc_t* mtp3_addr_dpc; static mtp3_addr_pc_t* mtp3_addr_opc; #define SIO_LENGTH 1 #define SLS_LENGTH 1 #define SIO_OFFSET 0 #define ROUTING_LABEL_OFFSET (SIO_OFFSET + SIO_LENGTH) #define ITU_ROUTING_LABEL_LENGTH 4 #define ITU_HEADER_LENGTH (SIO_LENGTH + ITU_ROUTING_LABEL_LENGTH) #define ITU_SLS_OFFSET (SIO_OFFSET + ITU_HEADER_LENGTH - SLS_LENGTH) #define ITU_MTP_PAYLOAD_OFFSET (SIO_OFFSET + ITU_HEADER_LENGTH) #define ANSI_ROUTING_LABEL_LENGTH (ANSI_PC_LENGTH + ANSI_PC_LENGTH + SLS_LENGTH) #define ANSI_HEADER_LENGTH (SIO_LENGTH + ANSI_ROUTING_LABEL_LENGTH) #define ANSI_DPC_OFFSET ROUTING_LABEL_OFFSET #define ANSI_OPC_OFFSET (ANSI_DPC_OFFSET + ANSI_PC_LENGTH) #define ANSI_SLS_OFFSET (ANSI_OPC_OFFSET + ANSI_PC_LENGTH) #define ANSI_MTP_PAYLOAD_OFFSET (SIO_OFFSET + ANSI_HEADER_LENGTH) #define JAPAN_SLS_SPARE_LENGTH 1 #define JAPAN_ROUTING_LABEL_LENGTH (JAPAN_PC_LENGTH + JAPAN_PC_LENGTH + JAPAN_SLS_SPARE_LENGTH) #define JAPAN_HEADER_LENGTH (SIO_LENGTH + JAPAN_ROUTING_LABEL_LENGTH) #define JAPAN_OPC_OFFSET (ROUTING_LABEL_OFFSET + JAPAN_PC_LENGTH) #define JAPAN_SLS_OFFSET (JAPAN_OPC_OFFSET + JAPAN_PC_LENGTH) #define JAPAN_SPARE_OFFSET (ROUTING_LABEL_OFFSET + JAPAN_ROUTING_LABEL_LENGTH) #define JAPAN_MTP_PAYLOAD_OFFSET (SIO_OFFSET + JAPAN_HEADER_LENGTH) #define SERVICE_INDICATOR_MASK 0x0F #define SPARE_MASK 0x30 #define ANSI_PRIORITY_MASK SPARE_MASK #define NETWORK_INDICATOR_MASK 0xC0 #define ITU_DPC_MASK 0x00003FFF #define ITU_OPC_MASK 0x0FFFC000 #define ITU_SLS_MASK 0xF0000000 #define ANSI_5BIT_SLS_MASK 0x1F #define ANSI_8BIT_SLS_MASK 0xFF #define CHINESE_ITU_SLS_MASK 0xF #define JAPAN_4_BIT_SLS_MASK 0xF #define JAPAN_4_BIT_SLS_SPARE_MASK 0xF0 #define JAPAN_5_BIT_SLS_MASK 0x1F #define JAPAN_5_BIT_SLS_SPARE_MASK 0xE0 /* the higher values are taken from the M3UA RFC */ static const value_string mtp3_service_indicator_code_vals[] = { { 0x0, "Signalling Network Management Message (SNM)" }, { 0x1, "Maintenance Regular Message (MTN)" }, { 0x2, "Maintenance Special Message (MTNS)" }, { 0x3, "SCCP" }, { 0x4, "TUP" }, { 0x5, "ISUP" }, { 0x6, "DUP (call and circuit related messages)" }, { 0x7, "DUP (facility registration and cancellation message)" }, { 0x8, "MTP testing user part" }, { 0x9, "Broadband ISUP" }, { 0xa, "Satellite ISUP" }, { 0xb, "Spare" }, { 0xc, "AAL type2 Signaling" }, { 0xd, "Bearer Independent Call Control (BICC)" }, { 0xe, "Gateway Control Protocol" }, { 0xf, "Spare" }, { 0, NULL } }; const value_string mtp3_service_indicator_code_short_vals[] = { { 0x0, "SNM" }, { 0x1, "MTN" }, { 0x2, "MTNS" }, { 0x3, "SCCP" }, { 0x4, "TUP" }, { 0x5, "ISUP" }, { 0x6, "DUP (CC)" }, { 0x7, "DUP (FAC/CANC)" }, { 0x8, "MTP Test" }, { 0x9, "ISUP-b" }, { 0xa, "ISUP-s" }, { 0xc, "AAL type 2" }, { 0xd, "BICC" }, { 0xe, "GCP" }, { 0, NULL } }; static const value_string network_indicator_vals[] = { { 0x0, "International network" }, { 0x1, "Spare (for international use only)" }, { 0x2, "National network" }, { 0x3, "Reserved for national use" }, { 0, NULL } }; static dissector_handle_t data_handle; /* * helper routine to format a point code in structured form */ void mtp3_pc_to_str_buf(const guint32 pc, gchar *buf, int buf_len) { switch (mtp3_standard) { case ITU_STANDARD: switch (itu_pc_structure) { case ITU_PC_STRUCTURE_NONE: g_snprintf(buf, buf_len, "%u", pc); break; case ITU_PC_STRUCTURE_3_8_3: /* this format is used in international ITU networks */ g_snprintf(buf, buf_len, "%u-%u-%u", (pc & 0x3800)>>11, (pc & 0x7f8) >> 3, (pc & 0x07) >> 0); break; case ITU_PC_STRUCTURE_4_3_4_3: /* this format is used in some national ITU networks, the German one for example. */ g_snprintf(buf, buf_len, "%u-%u-%u-%u", (pc & 0x3c00) >>10, (pc & 0x0380) >> 7, (pc & 0x0078) >> 3, (pc & 0x0007) >> 0); break; default: DISSECTOR_ASSERT_NOT_REACHED(); } break; case ANSI_STANDARD: case CHINESE_ITU_STANDARD: g_snprintf(buf, buf_len, "%u-%u-%u", (pc & ANSI_NETWORK_MASK) >> 16, (pc & ANSI_CLUSTER_MASK) >> 8, (pc & ANSI_MEMBER_MASK)); break; case JAPAN_STANDARD: switch (japan_pc_structure) { case JAPAN_PC_STRUCTURE_NONE: g_snprintf(buf, buf_len, "%u", pc); break; case JAPAN_PC_STRUCTURE_7_4_5: /* This format is specified by NTT */ g_snprintf(buf, buf_len, "%u-%u-%u", (pc & 0xfe00)>>9, (pc & 0x1e0)>>5, (pc & 0x1f)); break; case JAPAN_PC_STRUCTURE_3_4_4_5: /* Where does this format come from? */ g_snprintf(buf, buf_len, "%u-%u-%u-%u", (pc & 0xe000)>>13, (pc & 0x1e00)>>9, (pc & 0x1e0)>>5, (pc & 0x1f)); break; default: DISSECTOR_ASSERT_NOT_REACHED(); } break; default: DISSECTOR_ASSERT_NOT_REACHED(); } } #define MAX_STRUCTURED_PC_LENGTH 20 gchar * mtp3_pc_to_str(const guint32 pc) { gchar *str; str=ep_alloc(MAX_STRUCTURED_PC_LENGTH); mtp3_pc_to_str_buf(pc, str, MAX_STRUCTURED_PC_LENGTH); return str; } gboolean mtp3_pc_structured(void) { if ((mtp3_standard == ITU_STANDARD) && (itu_pc_structure == ITU_PC_STRUCTURE_NONE)) return FALSE; else if ((mtp3_standard == JAPAN_STANDARD) && (japan_pc_structure == JAPAN_PC_STRUCTURE_NONE)) return FALSE; else return TRUE; } /* * helper routine to format address to string */ void mtp3_addr_to_str_buf( const mtp3_addr_pc_t *addr_pc_p, gchar *buf, int buf_len) { switch (mtp3_addr_fmt) { case MTP3_ADDR_FMT_DEC: switch (addr_pc_p->type) { case ITU_STANDARD: g_snprintf(buf, buf_len, "%u", addr_pc_p->pc & ITU_PC_MASK); break; case JAPAN_STANDARD: g_snprintf(buf, buf_len, "%u", addr_pc_p->pc & JAPAN_PC_MASK); break; default: /* assuming 24-bit */ g_snprintf(buf, buf_len, "%u", addr_pc_p->pc & ANSI_PC_MASK); break; } break; case MTP3_ADDR_FMT_HEX: switch (addr_pc_p->type) { case ITU_STANDARD: g_snprintf(buf, buf_len, "%x", addr_pc_p->pc & ITU_PC_MASK); break; case JAPAN_STANDARD: g_snprintf(buf, buf_len, "%x", addr_pc_p->pc & JAPAN_PC_MASK); break; default: /* assuming 24-bit */ g_snprintf(buf, buf_len, "%x", addr_pc_p->pc & ANSI_PC_MASK); break; } break; case MTP3_ADDR_FMT_NI_DEC: switch (addr_pc_p->type) { case ITU_STANDARD: g_snprintf(buf, buf_len, "%u:%u", addr_pc_p->ni, addr_pc_p->pc & ITU_PC_MASK); break; case JAPAN_STANDARD: g_snprintf(buf, buf_len, "%u:%u", addr_pc_p->ni, addr_pc_p->pc & JAPAN_PC_MASK); break; default: /* assuming 24-bit */ g_snprintf(buf, buf_len, "%u:%u", addr_pc_p->ni, addr_pc_p->pc & ANSI_PC_MASK); break; } break; case MTP3_ADDR_FMT_NI_HEX: switch (addr_pc_p->type) { case ITU_STANDARD: g_snprintf(buf, buf_len, "%u:%x", addr_pc_p->ni, addr_pc_p->pc & ITU_PC_MASK); break; case JAPAN_STANDARD: g_snprintf(buf, buf_len, "%u:%x", addr_pc_p->ni, addr_pc_p->pc & JAPAN_PC_MASK); break; default: /* assuming 24-bit */ g_snprintf(buf, buf_len, "%u:%x", addr_pc_p->ni, addr_pc_p->pc & ANSI_PC_MASK); break; } break; default: /* FALLTHRU */ case MTP3_ADDR_FMT_DASHED: mtp3_pc_to_str_buf(addr_pc_p->pc, buf, buf_len); break; } } guint32 mtp3_pc_hash(const mtp3_addr_pc_t *addr_pc_p) { guint32 pc; switch (addr_pc_p->type) { case ITU_STANDARD: pc = (addr_pc_p->pc & ITU_PC_MASK) | ((addr_pc_p->ni % 4) << 14) ; break; default: /* assuming 24-bit */ pc = (addr_pc_p->pc & ANSI_PC_MASK) | ((addr_pc_p->ni) << 24) ; break; } return pc; } /* Common function for dissecting 3-byte (ANSI or China) PCs. */ void dissect_mtp3_3byte_pc(tvbuff_t *tvb, guint offset, proto_tree *tree, gint ett_pc, int hf_pc_string, int hf_pc_network, int hf_pc_cluster, int hf_pc_member, int hf_dpc, int hf_pc) { guint32 pc; proto_item *pc_item, *hidden_item; proto_tree *pc_tree; char pc_string[MAX_STRUCTURED_PC_LENGTH]; pc = tvb_get_letoh24(tvb, offset); mtp3_pc_to_str_buf(pc, pc_string, sizeof(pc_string)); pc_item = proto_tree_add_string(tree, hf_pc_string, tvb, offset, ANSI_PC_LENGTH, pc_string); /* Add alternate formats of the PC * NOTE: each of these formats is shown to the user, * so I think that using hidden fields in this case is OK. */ g_snprintf(pc_string, sizeof(pc_string), "%u", pc); proto_item_append_text(pc_item, " (%s)", pc_string); hidden_item = proto_tree_add_string(tree, hf_pc_string, tvb, offset, ANSI_PC_LENGTH, pc_string); PROTO_ITEM_SET_HIDDEN(hidden_item); g_snprintf(pc_string, sizeof(pc_string), "0x%x", pc); proto_item_append_text(pc_item, " (%s)", pc_string); hidden_item = proto_tree_add_string(tree, hf_pc_string, tvb, offset, ANSI_PC_LENGTH, pc_string); PROTO_ITEM_SET_HIDDEN(hidden_item); pc_tree = proto_item_add_subtree(pc_item, ett_pc); proto_tree_add_uint(pc_tree, hf_pc_network, tvb, offset + ANSI_NETWORK_OFFSET, ANSI_NCM_LENGTH, pc); proto_tree_add_uint(pc_tree, hf_pc_cluster, tvb, offset + ANSI_CLUSTER_OFFSET, ANSI_NCM_LENGTH, pc); proto_tree_add_uint(pc_tree, hf_pc_member, tvb, offset + ANSI_MEMBER_OFFSET, ANSI_NCM_LENGTH, pc); /* add full integer values of DPC as hidden for filtering purposes */ if (hf_dpc) { hidden_item = proto_tree_add_uint(pc_tree, hf_dpc, tvb, offset, ANSI_PC_LENGTH, pc); PROTO_ITEM_SET_HIDDEN(hidden_item); } if (hf_pc) { hidden_item = proto_tree_add_uint(pc_tree, hf_pc, tvb, offset, ANSI_PC_LENGTH, pc); PROTO_ITEM_SET_HIDDEN(hidden_item); } } static void dissect_mtp3_sio(tvbuff_t *tvb, packet_info *pinfo, proto_tree *mtp3_tree, void ** const pd_save) { guint8 sio; proto_item *sio_item; proto_tree *sio_tree; sio_item = proto_tree_add_text(mtp3_tree, tvb, SIO_OFFSET, SIO_LENGTH, "Service information octet"); sio_tree = proto_item_add_subtree(sio_item, ett_mtp3_sio); sio = tvb_get_guint8(tvb, SIO_OFFSET); proto_tree_add_uint(sio_tree, hf_mtp3_network_indicator, tvb, SIO_OFFSET, SIO_LENGTH, sio); mtp3_addr_opc->ni = (sio & NETWORK_INDICATOR_MASK) >> 6; mtp3_addr_dpc->ni = (sio & NETWORK_INDICATOR_MASK) >> 6; switch(mtp3_standard){ case ANSI_STANDARD: proto_tree_add_uint(sio_tree, hf_mtp3_ansi_priority, tvb, SIO_OFFSET, SIO_LENGTH, sio); break; case ITU_STANDARD: case CHINESE_ITU_STANDARD: if (mtp3_show_itu_priority) proto_tree_add_uint(sio_tree, hf_mtp3_itu_priority, tvb, SIO_OFFSET, SIO_LENGTH, sio); else proto_tree_add_uint(sio_tree, hf_mtp3_itu_spare, tvb, SIO_OFFSET, SIO_LENGTH, sio); break; case JAPAN_STANDARD: /* The Japan variant has priority but it's on the LI which belongs to * layer 2. Not sure what we can do about that... */ proto_tree_add_uint(sio_tree, hf_mtp3_itu_spare, tvb, SIO_OFFSET, SIO_LENGTH, sio); break; } proto_tree_add_uint(sio_tree, hf_mtp3_service_indicator, tvb, SIO_OFFSET, SIO_LENGTH, sio); /* Store the SI so that subidissectors know what SI this msg is */ *pd_save = pinfo->private_data; pinfo->private_data = GUINT_TO_POINTER(sio & SERVICE_INDICATOR_MASK); } static void dissect_mtp3_routing_label(tvbuff_t *tvb, packet_info *pinfo, proto_tree *mtp3_tree) { guint32 label, dpc, opc; proto_item *label_item, *label_dpc_item, *label_opc_item; proto_item *hidden_item; proto_tree *label_tree; proto_tree *pc_subtree; int hf_dpc_string; int hf_opc_string; switch (mtp3_standard) { case ITU_STANDARD: label_item = proto_tree_add_text(mtp3_tree, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, "Routing label"); label_tree = proto_item_add_subtree(label_item, ett_mtp3_label); label = tvb_get_letohl(tvb, ROUTING_LABEL_OFFSET); opc = (label & ITU_OPC_MASK) >> 14; dpc = label & ITU_DPC_MASK; hidden_item = proto_tree_add_uint(label_tree, hf_mtp3_itu_pc, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, opc); PROTO_ITEM_SET_HIDDEN(hidden_item); hidden_item = proto_tree_add_uint(label_tree, hf_mtp3_itu_pc, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, dpc); PROTO_ITEM_SET_HIDDEN(hidden_item); label_dpc_item = proto_tree_add_uint(label_tree, hf_mtp3_itu_dpc, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, label); if (mtp3_pc_structured()) proto_item_append_text(label_dpc_item, " (%s)", mtp3_pc_to_str(dpc)); if(mtp3_addr_dpc->ni == 0) { pc_subtree = proto_item_add_subtree(label_dpc_item, ett_mtp3_label_dpc); analyze_q708_ispc(tvb, pc_subtree, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, dpc); } label_opc_item = proto_tree_add_uint(label_tree, hf_mtp3_itu_opc, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, label); if (mtp3_pc_structured()) proto_item_append_text(label_opc_item, " (%s)", mtp3_pc_to_str(opc)); if(mtp3_addr_opc->ni == 0) { pc_subtree = proto_item_add_subtree(label_opc_item, ett_mtp3_label_opc); analyze_q708_ispc(tvb, pc_subtree, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, opc); } proto_tree_add_uint(label_tree, hf_mtp3_itu_sls, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, label); break; case ANSI_STANDARD: case CHINESE_ITU_STANDARD: if (mtp3_standard == ANSI_STANDARD) { hf_dpc_string = hf_mtp3_ansi_dpc; hf_opc_string = hf_mtp3_ansi_opc; } else /* CHINESE_ITU_STANDARD */ { hf_dpc_string = hf_mtp3_chinese_dpc; hf_opc_string = hf_mtp3_chinese_opc; } /* Create the Routing Label Tree */ label_item = proto_tree_add_text(mtp3_tree, tvb, ROUTING_LABEL_OFFSET, ANSI_ROUTING_LABEL_LENGTH, "Routing label"); label_tree = proto_item_add_subtree(label_item, ett_mtp3_label); /* create and fill the DPC tree */ dissect_mtp3_3byte_pc(tvb, ANSI_DPC_OFFSET, label_tree, ett_mtp3_label_dpc, hf_dpc_string, hf_mtp3_dpc_network, hf_mtp3_dpc_cluster, hf_mtp3_dpc_member, hf_mtp3_24bit_dpc, hf_mtp3_24bit_pc); /* Store dpc for mtp3_addr below */ dpc = tvb_get_letoh24(tvb, ANSI_DPC_OFFSET); /* create and fill the OPC tree */ dissect_mtp3_3byte_pc(tvb, ANSI_OPC_OFFSET, label_tree, ett_mtp3_label_opc, hf_opc_string, hf_mtp3_opc_network, hf_mtp3_opc_cluster, hf_mtp3_opc_member, hf_mtp3_24bit_opc, hf_mtp3_24bit_pc); /* Store opc for mtp3_addr below */ opc = tvb_get_letoh24(tvb, ANSI_OPC_OFFSET); /* SLS */ if (mtp3_standard == ANSI_STANDARD) { if (mtp3_use_ansi_5_bit_sls) proto_tree_add_item(label_tree, hf_mtp3_ansi_5_bit_sls, tvb, ANSI_SLS_OFFSET, SLS_LENGTH, ENC_NA); else proto_tree_add_item(label_tree, hf_mtp3_ansi_8_bit_sls, tvb, ANSI_SLS_OFFSET, SLS_LENGTH, ENC_NA); } else /* CHINESE_ITU_STANDARD */ { proto_tree_add_item(label_tree, hf_mtp3_chinese_itu_sls, tvb, ANSI_SLS_OFFSET, SLS_LENGTH, ENC_NA); } break; case JAPAN_STANDARD: label_item = proto_tree_add_text(mtp3_tree, tvb, ROUTING_LABEL_OFFSET, JAPAN_ROUTING_LABEL_LENGTH, "Routing label"); label_tree = proto_item_add_subtree(label_item, ett_mtp3_label); label_dpc_item = proto_tree_add_item(label_tree, hf_mtp3_japan_dpc, tvb, ROUTING_LABEL_OFFSET, JAPAN_PC_LENGTH, ENC_LITTLE_ENDIAN); dpc = tvb_get_letohs(tvb, ROUTING_LABEL_OFFSET); if (mtp3_pc_structured()) { proto_item_append_text(label_dpc_item, " (%s)", mtp3_pc_to_str(dpc)); } label_opc_item = proto_tree_add_item(label_tree, hf_mtp3_japan_opc, tvb, JAPAN_OPC_OFFSET, JAPAN_PC_LENGTH, ENC_LITTLE_ENDIAN); opc = tvb_get_letohs(tvb, JAPAN_OPC_OFFSET); if (mtp3_pc_structured()) { proto_item_append_text(label_opc_item, " (%s)", mtp3_pc_to_str(opc)); } hidden_item = proto_tree_add_item(label_tree, hf_mtp3_japan_pc, tvb, ROUTING_LABEL_OFFSET, JAPAN_PC_LENGTH, ENC_LITTLE_ENDIAN); PROTO_ITEM_SET_HIDDEN(hidden_item); hidden_item = proto_tree_add_item(label_tree, hf_mtp3_japan_pc, tvb, JAPAN_OPC_OFFSET, JAPAN_PC_LENGTH, ENC_LITTLE_ENDIAN); PROTO_ITEM_SET_HIDDEN(hidden_item); if (mtp3_use_japan_5_bit_sls) { proto_tree_add_item(label_tree, hf_mtp3_japan_5_bit_sls, tvb, JAPAN_SLS_OFFSET, JAPAN_SLS_SPARE_LENGTH, ENC_NA); proto_tree_add_item(label_tree, hf_mtp3_japan_5_bit_sls_spare, tvb, JAPAN_SLS_OFFSET, JAPAN_SLS_SPARE_LENGTH, ENC_NA); } else { proto_tree_add_item(label_tree, hf_mtp3_japan_4_bit_sls, tvb, JAPAN_SLS_OFFSET, JAPAN_SLS_SPARE_LENGTH, ENC_NA); proto_tree_add_item(label_tree, hf_mtp3_japan_4_bit_sls_spare, tvb, JAPAN_SLS_OFFSET, JAPAN_SLS_SPARE_LENGTH, ENC_NA); } break; default: DISSECTOR_ASSERT_NOT_REACHED(); } mtp3_addr_opc->type = mtp3_standard; mtp3_addr_opc->pc = opc; SET_ADDRESS(&pinfo->src, AT_SS7PC, sizeof(mtp3_addr_pc_t), (guint8 *) mtp3_addr_opc); mtp3_addr_dpc->type = mtp3_standard; mtp3_addr_dpc->pc = dpc; SET_ADDRESS(&pinfo->dst, AT_SS7PC, sizeof(mtp3_addr_pc_t), (guint8 *) mtp3_addr_dpc); } static void dissect_mtp3_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { guint8 sio; guint8 service_indicator; tvbuff_t *payload_tvb = NULL; sio = tvb_get_guint8(tvb, SIO_OFFSET); service_indicator = sio & SERVICE_INDICATOR_MASK; switch (mtp3_standard) { case ITU_STANDARD: payload_tvb = tvb_new_subset_remaining(tvb, ITU_MTP_PAYLOAD_OFFSET); break; case ANSI_STANDARD: case CHINESE_ITU_STANDARD: payload_tvb = tvb_new_subset_remaining(tvb, ANSI_MTP_PAYLOAD_OFFSET); break; case JAPAN_STANDARD: payload_tvb = tvb_new_subset_remaining(tvb, JAPAN_MTP_PAYLOAD_OFFSET); break; default: DISSECTOR_ASSERT_NOT_REACHED(); } col_set_str(pinfo->cinfo, COL_INFO, "DATA "); if (!dissector_try_uint(mtp3_sio_dissector_table, service_indicator, payload_tvb, pinfo, tree)) call_dissector(data_handle, payload_tvb, pinfo, tree); } /* Code to actually dissect the packets */ static void dissect_mtp3(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { void* pd_save; mtp3_tap_rec_t* tap_rec = ep_alloc0(sizeof(mtp3_tap_rec_t)); /* Set up structures needed to add the protocol subtree and manage it */ proto_item *mtp3_item = NULL; proto_tree *mtp3_tree = NULL; /* Make entries in Protocol column on summary display */ switch(mtp3_standard) { case ITU_STANDARD: col_set_str(pinfo->cinfo, COL_PROTOCOL, "MTP3 (Int. ITU)"); break; case ANSI_STANDARD: col_set_str(pinfo->cinfo, COL_PROTOCOL, "MTP3 (ANSI)"); break; case CHINESE_ITU_STANDARD: col_set_str(pinfo->cinfo, COL_PROTOCOL, "MTP3 (Chin. ITU)"); break; case JAPAN_STANDARD: col_set_str(pinfo->cinfo, COL_PROTOCOL, "MTP3 (Japan)"); break; }; if (tree) { /* create display subtree for the protocol */ switch (mtp3_standard) { case ITU_STANDARD: mtp3_item = proto_tree_add_item(tree, proto_mtp3, tvb, 0, ITU_HEADER_LENGTH, ENC_NA); break; case ANSI_STANDARD: case CHINESE_ITU_STANDARD: mtp3_item = proto_tree_add_item(tree, proto_mtp3, tvb, 0, ANSI_HEADER_LENGTH, ENC_NA); break; case JAPAN_STANDARD: mtp3_item = proto_tree_add_item(tree, proto_mtp3, tvb, 0, JAPAN_HEADER_LENGTH, ENC_NA); break; } mtp3_tree = proto_item_add_subtree(mtp3_item, ett_mtp3); } mtp3_addr_opc = ep_alloc0(sizeof(mtp3_addr_pc_t)); mtp3_addr_dpc = ep_alloc0(sizeof(mtp3_addr_pc_t)); /* Dissect the packet (even if !tree so can call sub-dissectors and update * the source and destination address columns) */ dissect_mtp3_sio(tvb, pinfo, mtp3_tree, &pd_save); dissect_mtp3_routing_label(tvb, pinfo, mtp3_tree); memcpy(&(tap_rec->addr_opc),mtp3_addr_opc,sizeof(mtp3_addr_pc_t)); memcpy(&(tap_rec->addr_dpc),mtp3_addr_dpc,sizeof(mtp3_addr_pc_t)); tap_rec->si_code = (tvb_get_guint8(tvb, SIO_OFFSET) & SERVICE_INDICATOR_MASK); tap_rec->size = tvb_length(tvb); tap_queue_packet(mtp3_tap, pinfo, tap_rec); dissect_mtp3_payload(tvb, pinfo, tree); pinfo->private_data = pd_save; } void proto_register_mtp3(void) { /* Setup list of header fields See Section 1.6.1 for details*/ static hf_register_info hf[] = { { &hf_mtp3_service_indicator, { "Service indicator", "mtp3.service_indicator", FT_UINT8, BASE_HEX, VALS(mtp3_service_indicator_code_vals), SERVICE_INDICATOR_MASK, NULL, HFILL }}, { &hf_mtp3_network_indicator, { "Network indicator", "mtp3.network_indicator", FT_UINT8, BASE_HEX, VALS(network_indicator_vals), NETWORK_INDICATOR_MASK, NULL, HFILL }}, { &hf_mtp3_itu_spare, { "Spare", "mtp3.spare", FT_UINT8, BASE_HEX, NULL, SPARE_MASK, NULL, HFILL }}, { &hf_mtp3_itu_priority, { "ITU priority", "mtp3.priority", FT_UINT8, BASE_DEC, NULL, SPARE_MASK, NULL, HFILL }}, { &hf_mtp3_ansi_priority, { "ANSI Priority", "mtp3.priority", FT_UINT8, BASE_DEC, NULL, ANSI_PRIORITY_MASK, NULL, HFILL }}, { &hf_mtp3_itu_opc, { "OPC", "mtp3.opc", FT_UINT32, BASE_DEC, NULL, ITU_OPC_MASK, NULL, HFILL }}, { &hf_mtp3_itu_pc, { "PC", "mtp3.pc", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_mtp3_24bit_pc, { "PC", "mtp3.pc", FT_UINT32, BASE_DEC, NULL, ANSI_PC_MASK, NULL, HFILL }}, { &hf_mtp3_24bit_opc, { "OPC", "mtp3.opc", FT_UINT32, BASE_DEC, NULL, ANSI_PC_MASK, NULL, HFILL }}, { &hf_mtp3_ansi_opc, { "OPC", "mtp3.ansi_opc", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_mtp3_chinese_opc, { "OPC", "mtp3.chinese_opc", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_mtp3_opc_network, { "OPC Network", "mtp3.opc.network", FT_UINT24, BASE_DEC, NULL, ANSI_NETWORK_MASK, NULL, HFILL }}, { &hf_mtp3_opc_cluster, { "OPC Cluster", "mtp3.opc.cluster", FT_UINT24, BASE_DEC, NULL, ANSI_CLUSTER_MASK, NULL, HFILL }}, { &hf_mtp3_opc_member, { "OPC Member", "mtp3.opc.member", FT_UINT24, BASE_DEC, NULL, ANSI_MEMBER_MASK, NULL, HFILL }}, { &hf_mtp3_japan_opc, { "OPC", "mtp3.opc", FT_UINT16, BASE_DEC, NULL, JAPAN_PC_MASK, NULL, HFILL }}, { &hf_mtp3_japan_pc, { "PC", "mtp3.pc", FT_UINT16, BASE_DEC, NULL, JAPAN_PC_MASK, NULL, HFILL }}, { &hf_mtp3_itu_dpc, { "DPC", "mtp3.dpc", FT_UINT32, BASE_DEC, NULL, ITU_DPC_MASK, NULL, HFILL }}, { &hf_mtp3_24bit_dpc, { "DPC", "mtp3.dpc", FT_UINT32, BASE_DEC, NULL, ANSI_PC_MASK, NULL, HFILL }}, { &hf_mtp3_ansi_dpc, { "DPC", "mtp3.ansi_dpc", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_mtp3_chinese_dpc, { "DPC", "mtp3.chinese_dpc", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_mtp3_dpc_network, { "DPC Network", "mtp3.dpc.network", FT_UINT24, BASE_DEC, NULL, ANSI_NETWORK_MASK, NULL, HFILL }}, { &hf_mtp3_dpc_cluster, { "DPC Cluster", "mtp3.dpc.cluster", FT_UINT24, BASE_DEC, NULL, ANSI_CLUSTER_MASK, NULL, HFILL }}, { &hf_mtp3_dpc_member, { "DPC Member", "mtp3.dpc.member", FT_UINT24, BASE_DEC, NULL, ANSI_MEMBER_MASK, NULL, HFILL }}, { &hf_mtp3_japan_dpc, { "DPC", "mtp3.dpc", FT_UINT16, BASE_DEC, NULL, JAPAN_PC_MASK, NULL, HFILL }}, { &hf_mtp3_itu_sls, { "Signalling Link Selector", "mtp3.sls", FT_UINT32, BASE_DEC, NULL, ITU_SLS_MASK, NULL, HFILL }}, { &hf_mtp3_japan_4_bit_sls, { "Signalling Link Selector", "mtp3.sls", FT_UINT8, BASE_DEC, NULL, JAPAN_4_BIT_SLS_MASK, NULL, HFILL }}, { &hf_mtp3_japan_4_bit_sls_spare, { "SLS Spare", "mtp3.sls_spare", FT_UINT8, BASE_HEX, NULL, JAPAN_4_BIT_SLS_SPARE_MASK, NULL, HFILL }}, { &hf_mtp3_japan_5_bit_sls, { "Signalling Link Selector", "mtp3.sls", FT_UINT8, BASE_DEC, NULL, JAPAN_5_BIT_SLS_MASK, NULL, HFILL }}, { &hf_mtp3_japan_5_bit_sls_spare, { "SLS Spare", "mtp3.sls_spare", FT_UINT8, BASE_HEX, NULL, JAPAN_5_BIT_SLS_SPARE_MASK, NULL, HFILL }}, { &hf_mtp3_ansi_5_bit_sls, { "Signalling Link Selector", "mtp3.sls", FT_UINT8, BASE_DEC, NULL, ANSI_5BIT_SLS_MASK, NULL, HFILL }}, { &hf_mtp3_ansi_8_bit_sls, { "Signalling Link Selector", "mtp3.sls", FT_UINT8, BASE_DEC, NULL, ANSI_8BIT_SLS_MASK, NULL, HFILL }}, { &hf_mtp3_chinese_itu_sls, { "Signalling Link Selector", "mtp3.sls", FT_UINT8, BASE_DEC, NULL, CHINESE_ITU_SLS_MASK, NULL, HFILL }} }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_mtp3, &ett_mtp3_sio, &ett_mtp3_label, &ett_mtp3_label_dpc, &ett_mtp3_label_opc }; static enum_val_t mtp3_options[] = { { "itu", "ITU", ITU_STANDARD }, { "ansi", "ANSI", ANSI_STANDARD }, { "chinese-itu", "Chinese ITU", CHINESE_ITU_STANDARD }, { "japan", "Japan", JAPAN_STANDARD }, { NULL, NULL, 0 } }; static enum_val_t mtp3_addr_fmt_str_e[] = { { "decimal", "Decimal", MTP3_ADDR_FMT_DEC }, { "hexadecimal", "Hexadecimal", MTP3_ADDR_FMT_HEX }, { "ni-decimal", "NI-Decimal", MTP3_ADDR_FMT_NI_DEC }, { "ni-hexadecimal", "NI-Hexadecimal", MTP3_ADDR_FMT_NI_HEX }, { "dashed", "Dashed", MTP3_ADDR_FMT_DASHED }, { NULL, NULL, 0 } }; static enum_val_t itu_pc_structures[] = { { "unstructured", "Unstructured", ITU_PC_STRUCTURE_NONE}, { "3-8-3", "3-8-3", ITU_PC_STRUCTURE_3_8_3 }, { "4-3-4-3", "4-3-4-3", ITU_PC_STRUCTURE_4_3_4_3 }, { NULL, NULL, 0 } }; static enum_val_t japan_pc_structures[] = { { "unstructured", "Unstructured", JAPAN_PC_STRUCTURE_NONE}, { "7-4-5", "7-4-5", JAPAN_PC_STRUCTURE_7_4_5 }, { "3-4-4-5", "3-4-4-5", JAPAN_PC_STRUCTURE_3_4_4_5 }, { NULL, NULL, 0 } }; /* Register the protocol name and description */ proto_mtp3 = proto_register_protocol("Message Transfer Part Level 3", "MTP3", "mtp3"); register_dissector("mtp3", dissect_mtp3, proto_mtp3); /* Required function calls to register the header fields and subtrees used */ proto_register_field_array(proto_mtp3, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); mtp3_sio_dissector_table = register_dissector_table("mtp3.service_indicator", "MTP3 Service indicator", FT_UINT8, BASE_HEX); mtp3_tap = register_tap("mtp3"); mtp3_module = prefs_register_protocol(proto_mtp3, NULL); prefs_register_enum_preference(mtp3_module, "standard", "MTP3 standard", "The SS7 standard used in MTP3 packets", &mtp3_standard, mtp3_options, FALSE); prefs_register_enum_preference(mtp3_module, "itu_pc_structure", "ITU Pointcode structure", "The structure of the pointcodes in ITU networks", &itu_pc_structure, itu_pc_structures, FALSE); prefs_register_enum_preference(mtp3_module, "japan_pc_structure", "Japan Pointcode structure", "The structure of the pointcodes in Japan networks", &japan_pc_structure, japan_pc_structures, FALSE); prefs_register_bool_preference(mtp3_module, "ansi_5_bit_sls", "Use 5-bit SLS (ANSI only)", "Use 5-bit (instead of 8-bit) SLS in ANSI MTP3 packets", &mtp3_use_ansi_5_bit_sls); prefs_register_bool_preference(mtp3_module, "japan_5_bit_sls", "Use 5-bit SLS (Japan only)", "Use 5-bit (instead of 4-bit) SLS in Japan MTP3 packets", &mtp3_use_japan_5_bit_sls); prefs_register_enum_preference(mtp3_module, "addr_format", "Address Format", "Format for point code in the address columns", &mtp3_addr_fmt, mtp3_addr_fmt_str_e, FALSE); prefs_register_bool_preference(mtp3_module, "itu_priority", "Show MSU priority (national option, ITU and China ITU only)", "Decode the spare bits of the SIO as the MSU priority (a national option in ITU)", &mtp3_show_itu_priority); } void proto_reg_handoff_mtp3(void) { dissector_handle_t mtp3_handle; mtp3_handle = find_dissector("mtp3"); dissector_add_uint("wtap_encap", WTAP_ENCAP_MTP3, mtp3_handle); dissector_add_string("tali.opcode", "mtp3", mtp3_handle); data_handle = find_dissector("data"); }