/* packet-redback.c * * Wireshark - Network traffic analyzer * By Gerald Combs * * Ericsson SmartEdge tcpdump trace disassembly * Copyright 2005-2014 Florian Lohoff * * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #define NEW_PROTO_TREE_API #include "config.h" #include #include #include #include "packet-ip.h" void proto_register_redback(void); void proto_reg_handoff_redback(void); static dissector_handle_t redback_handle; static gint ett_redback = -1; static dissector_table_t osinl_incl_subdissector_table; static dissector_table_t osinl_excl_subdissector_table; static dissector_handle_t ipv4_handle; static dissector_handle_t ipv6_handle; static dissector_handle_t ethnofcs_handle; static dissector_handle_t clnp_handle; static dissector_handle_t arp_handle; static dissector_handle_t ppp_handle; static dissector_handle_t ppphdlc_handle; static dissector_handle_t data_handle; static header_field_info *hfi_redback = NULL; #define REDBACK_HFI_INIT HFI_INIT(proto_redback) static header_field_info hfi_redback_context REDBACK_HFI_INIT = { "Context", "redback.context", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }; static header_field_info hfi_redback_flags REDBACK_HFI_INIT = { "Flags", "redback.flags", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }; static header_field_info hfi_redback_circuit REDBACK_HFI_INIT = { "Circuit", "redback.circuit", FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL }; static header_field_info hfi_redback_length REDBACK_HFI_INIT = { "Length", "redback.length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }; static header_field_info hfi_redback_protocol REDBACK_HFI_INIT = { "Protocol", "redback.protocol", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }; static header_field_info hfi_redback_l3offset REDBACK_HFI_INIT = { "Layer 3 Offset", "redback.l3offset", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }; static header_field_info hfi_redback_dataoffset REDBACK_HFI_INIT = { "Data Offset", "redback.dataoffset", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }; static header_field_info hfi_redback_padding REDBACK_HFI_INIT = { "Padding", "redback.padding", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }; static header_field_info hfi_redback_unknown REDBACK_HFI_INIT = { "Unknown", "redback.unknown", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }; static void dissect_redback(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { guint16 l3off, dataoff, proto; proto_item *ti; proto_tree *rbtree = NULL; tvbuff_t *next_tvb; col_set_str(pinfo->cinfo,COL_PROTOCOL,"RBN"); dataoff = tvb_get_ntohs(tvb, 20); l3off = tvb_get_ntohs(tvb, 22); if (tree) { ti = proto_tree_add_item(tree, hfi_redback, tvb, 0, -1, ENC_NA); rbtree = proto_item_add_subtree(ti, ett_redback); proto_tree_add_item(rbtree, &hfi_redback_context, tvb, 0, 4, ENC_BIG_ENDIAN); proto_tree_add_item(rbtree, &hfi_redback_flags, tvb, 4, 4, ENC_BIG_ENDIAN); proto_tree_add_item(rbtree, &hfi_redback_circuit, tvb, 8, 8, ENC_BIG_ENDIAN); proto_tree_add_item(rbtree, &hfi_redback_length, tvb, 16, 2, ENC_BIG_ENDIAN); proto_tree_add_item(rbtree, &hfi_redback_protocol, tvb, 18, 2, ENC_BIG_ENDIAN); proto_tree_add_item(rbtree, &hfi_redback_dataoffset, tvb, 20, 2, ENC_BIG_ENDIAN); proto_tree_add_item(rbtree, &hfi_redback_l3offset, tvb, 22, 2, ENC_BIG_ENDIAN); if (dataoff > 24) { proto_tree_add_item(rbtree, &hfi_redback_padding, tvb, 24, dataoff-24, ENC_NA); } } proto = tvb_get_ntohs(tvb, 18); switch(proto) { case 0x01: /* * IP on Ethernet - Incoming data points to an ethernet header * outgoing we have a pure IPv4 Packet */ next_tvb = tvb_new_subset_remaining(tvb, dataoff); if (dataoff == l3off) call_dissector(ipv4_handle, next_tvb, pinfo, tree); else if (dataoff+2 == l3off) call_dissector(ppp_handle, next_tvb, pinfo, tree); else if (dataoff+4 == l3off) call_dissector(ppphdlc_handle, next_tvb, pinfo, tree); else call_dissector(ethnofcs_handle, next_tvb, pinfo, tree); break; case 0x02: /* * This is ISIS - Either incoming with ethernet FCS * and CLNP - passed to the eth dissector or in case * of outgoing it's pure ISIS and the linecard attaches * the ethernet and CLNP headers ... * */ next_tvb = tvb_new_subset_remaining(tvb, dataoff); if (l3off > dataoff) { call_dissector(ethnofcs_handle, next_tvb, pinfo, tree); } else { guint8 nlpid = tvb_get_guint8(tvb, dataoff); if(dissector_try_uint(osinl_incl_subdissector_table, nlpid, next_tvb, pinfo, tree)) break; next_tvb = tvb_new_subset_remaining(tvb, dataoff+1); if(dissector_try_uint(osinl_excl_subdissector_table, nlpid, next_tvb, pinfo, tree)) break; next_tvb = tvb_new_subset_remaining(tvb, dataoff); call_dissector(data_handle, next_tvb, pinfo, tree); } break; case 0x06: { /* * PPP Messages e.g. LCP, IPCP etc - possibly on ethernet in case of PPPoE. * PPPoE messages are Protocol 8 ... */ guint32 flags; flags = tvb_get_ntohl(tvb, 4); if (flags & 0x04000000) { next_tvb = tvb_new_subset_remaining(tvb, dataoff); } else { if (tree) proto_tree_add_item(rbtree, &hfi_redback_unknown, tvb, dataoff, 4, ENC_NA); next_tvb = tvb_new_subset_remaining(tvb, dataoff+4); } if (l3off == dataoff) { call_dissector(ppp_handle, next_tvb, pinfo, tree); } else { call_dissector(ethnofcs_handle, next_tvb, pinfo, tree); } break; } case 0x03: /* Unicast Ethernet tx - Seen with PPPoE PADO */ case 0x04: /* Unicast Ethernet rx - Seen with ARP */ case 0x08: /* Broadcast Ethernet rx - Seen with PPPoE PADI */ next_tvb = tvb_new_subset_remaining(tvb, dataoff); call_dissector(ethnofcs_handle, next_tvb, pinfo, tree); break; case 0x09: /* IPv6 either encapsulated as ethernet or native ip */ next_tvb = tvb_new_subset_remaining(tvb, dataoff); if (dataoff == l3off) call_dissector(ipv6_handle, next_tvb, pinfo, tree); else call_dissector(ethnofcs_handle, next_tvb, pinfo, tree); break; default: if (tree) proto_tree_add_text (rbtree, tvb, 24, -1, "Unknown Protocol Data %u", proto); break; } return; } void proto_register_redback(void) { #ifndef HAVE_HFI_SECTION_INIT static header_field_info *hfi[] = { &hfi_redback_context, &hfi_redback_flags, &hfi_redback_circuit, &hfi_redback_length, &hfi_redback_protocol, &hfi_redback_l3offset, &hfi_redback_dataoffset, &hfi_redback_padding, &hfi_redback_unknown, }; #endif static gint *ett[] = { &ett_redback }; int proto_redback; proto_redback = proto_register_protocol("Redback", "Redback", "redback"); hfi_redback = proto_registrar_get_nth(proto_redback); proto_register_fields(proto_redback, hfi, array_length(hfi)); proto_register_subtree_array(ett, array_length(ett)); redback_handle = create_dissector_handle(dissect_redback, proto_redback); } void proto_reg_handoff_redback(void) { osinl_incl_subdissector_table = find_dissector_table("osinl.incl"); osinl_excl_subdissector_table = find_dissector_table("osinl.excl"); ipv4_handle = find_dissector("ip"); ipv6_handle = find_dissector("ipv6"); data_handle = find_dissector("data"); ethnofcs_handle = find_dissector("eth_withoutfcs"); clnp_handle = find_dissector("clnp"); arp_handle = find_dissector("arp"); ppp_handle = find_dissector("ppp"); ppphdlc_handle = find_dissector("ppp_hdlc"); dissector_add_uint("wtap_encap", WTAP_ENCAP_REDBACK, redback_handle); }