/* packet-redback.c * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * * Start of RedBack SmartEdge 400/800 tcpdump trace disassembly * Copyright 2005-2008 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include "packet-ip.h" static int proto_redback = -1; static gint ett_redback = -1; static dissector_table_t osinl_subdissector_table; static dissector_table_t osinl_excl_subdissector_table; static dissector_handle_t ipv4_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 int hf_redback_context = -1; static int hf_redback_flags = -1; static int hf_redback_circuit = -1; static int hf_redback_length = -1; static int hf_redback_protocol = -1; static int hf_redback_l3offset = -1; static int hf_redback_dataoffset = -1; static int hf_redback_padding = -1; static int hf_redback_unknown = -1; 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; if(check_col(pinfo->cinfo,COL_PROTOCOL)) col_add_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, proto_redback, tvb, 0, -1, FALSE); rbtree = proto_item_add_subtree(ti, ett_redback); proto_tree_add_item(rbtree, hf_redback_context, tvb, 0, 4, FALSE); proto_tree_add_item(rbtree, hf_redback_flags, tvb, 4, 4, FALSE); proto_tree_add_item(rbtree, hf_redback_circuit, tvb, 8, 8, FALSE); proto_tree_add_item(rbtree, hf_redback_length, tvb, 16, 2, FALSE); proto_tree_add_item(rbtree, hf_redback_protocol, tvb, 18, 2, FALSE); proto_tree_add_item(rbtree, hf_redback_dataoffset, tvb, 20, 2, FALSE); proto_tree_add_item(rbtree, hf_redback_l3offset, tvb, 22, 2, FALSE); if (dataoff > 24) { proto_tree_add_item(rbtree, hf_redback_padding, tvb, 24, dataoff-24, FALSE); } } 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 its 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_port(osinl_subdissector_table, nlpid, next_tvb, pinfo, tree)) break; next_tvb = tvb_new_subset_remaining(tvb, dataoff+1); if(dissector_try_port(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 & 0x00400000) { next_tvb = tvb_new_subset_remaining(tvb, dataoff); } else { if (tree) proto_tree_add_item(rbtree, hf_redback_unknown, tvb, dataoff, 4, FALSE); 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; default: if (tree) proto_tree_add_text (rbtree, tvb, 24, -1, "Unknown Protocol Data %u", proto); break; } return; } void proto_register_redback(void) { static hf_register_info hf[] = { { &hf_redback_context, { "Context", "redback.context", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_redback_flags, { "Flags", "redback.flags", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_redback_circuit, { "Circuit", "redback.circuit", FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_redback_length, { "Length", "redback.length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_redback_protocol, { "Protocol", "redback.protocol", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_redback_l3offset, { "Layer 3 Offset", "redback.l3offset", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_redback_dataoffset, { "Data Offset", "redback.dataoffset", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_redback_padding, { "Padding", "redback.padding", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_redback_unknown, { "Unknown", "redback.unknown", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }} }; static gint *ett[] = { &ett_redback }; proto_redback = proto_register_protocol("Redback", "Redback", "redback"); proto_register_field_array(proto_redback, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_redback(void) { dissector_handle_t redback_handle; osinl_subdissector_table = find_dissector_table("osinl"); osinl_excl_subdissector_table = find_dissector_table("osinl.excl"); ipv4_handle = find_dissector("ip"); 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"); redback_handle = create_dissector_handle(dissect_redback, proto_redback); dissector_add("wtap_encap", WTAP_ENCAP_REDBACK, redback_handle); }