/* packet-dvb-s2-bb.c * Routines for DVB Dynamic Mode Adaptation dissection * refer to * https://web.archive.org/web/20170226064346/http://satlabs.org/pdf/sl_561_Mode_Adaptation_Input_and_Output_Interfaces_for_DVB-S2_Equipment_v1.3.pdf * * (http://satlabs.org/pdf/sl_561_Mode_Adaptation_Input_and_Output_Interfaces_for_DVB-S2_Equipment_v1.3.pdf * is no longer available) * * Standards: * ETSI EN 302 307-1 - Digital Video Broadcasting (DVB) - Framing Structure Part 1: DVB-S2 * ETSI EN 302 307-2 - Digital Video Broadcasting (DVB) - Framing Structure Part 2: DVB-S2X * ETSI TS 102 606-1 - Digital Video Broadcasting (DVB) - Generic Stream Encapsulation (GSE) Part 1: Protocol * ETSI TS 102 771 - Digital Video Broadcasting (DVB) - GSE implementation guidelines * SatLabs sl_561 - Mode Adaptation Interfaces for DVB-S2 equipment * ETSI EN 302 769 - Digital Video Broadcasting (DVB) - Framing Structure DVB-C2 * ETSI EN 302 755 - Digital Video Broadcasting (DVB) - Framing Structure DVB-T2 * ETSI EN 301 545 - Digital Video Broadcasting (DVB) - Second Generation DVB Interactive Satellite System (DVB-RCS2) * RFC 4326 - Unidirectional Lightweight Encapsulation (ULE) for Transmission of IP Datagrams over an MPEG-2 Transport Stream (TS) * IANA registries: * * Mandatory Extension Headers (or link-dependent type fields) for ULE (Range 0-255 decimal): * * https://www.iana.org/assignments/ule-next-headers/ule-next-headers.xhtml#ule-next-headers-1 * * and * * Optional Extension Headers for ULE (Range 256-511 decimal): * * https://www.iana.org/assignments/ule-next-headers/ule-next-headers.xhtml#ule-next-headers-2 * * Copyright 2012, Tobias Rutz * Copyright 2013-2020, Thales Alenia Space * Copyright 2013-2021, Viveris Technologies * Copyright 2021, John Thacker * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "config.h" #include #include #include #include #include #include #include #include #include #include #include #include "packet-mp2t.h" #define BIT_IS_SET(var, bit) ((var) & (1 << (bit))) #define BIT_IS_CLEAR(var, bit) !BIT_IS_SET(var, bit) #define DVB_S2_MODEADAPT_MINSIZE (DVB_S2_BB_OFFS_CRC + 1) /* Types of mode adaptation headers supported. */ #define DVB_S2_MODEADAPT_TYPE_L1 1 #define DVB_S2_MODEADAPT_TYPE_L2 2 #define DVB_S2_MODEADAPT_TYPE_L3 3 #define DVB_S2_MODEADAPT_TYPE_L4 4 #define DVB_S2_MODEADAPT_L1SIZE 0 #define DVB_S2_MODEADAPT_L2SIZE 2 #define DVB_S2_MODEADAPT_L3SIZE 4 #define DVB_S2_MODEADAPT_L4SIZE 3 static const int dvb_s2_modeadapt_sizes[] = { [DVB_S2_MODEADAPT_TYPE_L1] = DVB_S2_MODEADAPT_L1SIZE, [DVB_S2_MODEADAPT_TYPE_L2] = DVB_S2_MODEADAPT_L2SIZE, [DVB_S2_MODEADAPT_TYPE_L3] = DVB_S2_MODEADAPT_L3SIZE, [DVB_S2_MODEADAPT_TYPE_L4] = DVB_S2_MODEADAPT_L4SIZE, }; /* CRC table crc-8, poly=0xD5 */ static guint8 crc8_table[256] = { 0x00, 0xD5, 0x7F, 0xAA, 0xFE, 0x2B, 0x81, 0x54, 0x29, 0xFC, 0x56, 0x83, 0xD7, 0x02, 0xA8, 0x7D, 0x52, 0x87, 0x2D, 0xF8, 0xAC, 0x79, 0xD3, 0x06, 0x7B, 0xAE, 0x04, 0xD1, 0x85, 0x50, 0xFA, 0x2F, 0xA4, 0x71, 0xDB, 0x0E, 0x5A, 0x8F, 0x25, 0xF0, 0x8D, 0x58, 0xF2, 0x27, 0x73, 0xA6, 0x0C, 0xD9, 0xF6, 0x23, 0x89, 0x5C, 0x08, 0xDD, 0x77, 0xA2, 0xDF, 0x0A, 0xA0, 0x75, 0x21, 0xF4, 0x5E, 0x8B, 0x9D, 0x48, 0xE2, 0x37, 0x63, 0xB6, 0x1C, 0xC9, 0xB4, 0x61, 0xCB, 0x1E, 0x4A, 0x9F, 0x35, 0xE0, 0xCF, 0x1A, 0xB0, 0x65, 0x31, 0xE4, 0x4E, 0x9B, 0xE6, 0x33, 0x99, 0x4C, 0x18, 0xCD, 0x67, 0xB2, 0x39, 0xEC, 0x46, 0x93, 0xC7, 0x12, 0xB8, 0x6D, 0x10, 0xC5, 0x6F, 0xBA, 0xEE, 0x3B, 0x91, 0x44, 0x6B, 0xBE, 0x14, 0xC1, 0x95, 0x40, 0xEA, 0x3F, 0x42, 0x97, 0x3D, 0xE8, 0xBC, 0x69, 0xC3, 0x16, 0xEF, 0x3A, 0x90, 0x45, 0x11, 0xC4, 0x6E, 0xBB, 0xC6, 0x13, 0xB9, 0x6C, 0x38, 0xED, 0x47, 0x92, 0xBD, 0x68, 0xC2, 0x17, 0x43, 0x96, 0x3C, 0xE9, 0x94, 0x41, 0xEB, 0x3E, 0x6A, 0xBF, 0x15, 0xC0, 0x4B, 0x9E, 0x34, 0xE1, 0xB5, 0x60, 0xCA, 0x1F, 0x62, 0xB7, 0x1D, 0xC8, 0x9C, 0x49, 0xE3, 0x36, 0x19, 0xCC, 0x66, 0xB3, 0xE7, 0x32, 0x98, 0x4D, 0x30, 0xE5, 0x4F, 0x9A, 0xCE, 0x1B, 0xB1, 0x64, 0x72, 0xA7, 0x0D, 0xD8, 0x8C, 0x59, 0xF3, 0x26, 0x5B, 0x8E, 0x24, 0xF1, 0xA5, 0x70, 0xDA, 0x0F, 0x20, 0xF5, 0x5F, 0x8A, 0xDE, 0x0B, 0xA1, 0x74, 0x09, 0xDC, 0x76, 0xA3, 0xF7, 0x22, 0x88, 0x5D, 0xD6, 0x03, 0xA9, 0x7C, 0x28, 0xFD, 0x57, 0x82, 0xFF, 0x2A, 0x80, 0x55, 0x01, 0xD4, 0x7E, 0xAB, 0x84, 0x51, 0xFB, 0x2E, 0x7A, 0xAF, 0x05, 0xD0, 0xAD, 0x78, 0xD2, 0x07, 0x53, 0x86, 0x2C, 0xF9 }; static dissector_handle_t ip_handle; static dissector_handle_t ipv6_handle; static dissector_handle_t eth_withoutfcs_handle; static dissector_handle_t dvb_s2_table_handle; static dissector_handle_t data_handle; static dissector_handle_t mp2t_handle; static dissector_handle_t dvb_s2_modeadapt_handle; /* The dynamic payload type range which will be dissected as H.264 */ static range_t *temp_dynamic_payload_type_range = NULL; void proto_register_dvb_s2_modeadapt(void); void proto_reg_handoff_dvb_s2_modeadapt(void); /* preferences */ #define DVB_S2_RCS_TABLE_DECODING 0 #define DVB_S2_RCS2_TABLE_DECODING 1 static const enum_val_t dvb_s2_modeadapt_enum[] = { {"l1", "L.1 (0 bytes)", DVB_S2_MODEADAPT_TYPE_L1}, {"l2", "L.2 (2 bytes including sync)", DVB_S2_MODEADAPT_TYPE_L2}, {"l3", "L.3 (4 bytes including sync)", DVB_S2_MODEADAPT_TYPE_L3}, {"l4", "L.4 (3 bytes)", DVB_S2_MODEADAPT_TYPE_L4}, {NULL, NULL, -1} }; static gboolean dvb_s2_full_dissection = FALSE; static gboolean dvb_s2_df_dissection = FALSE; static gint dvb_s2_default_modeadapt = DVB_S2_MODEADAPT_TYPE_L3; /* Initialize the protocol and registered fields */ static int proto_dvb_s2_modeadapt = -1; static int hf_dvb_s2_modeadapt_sync = -1; static int hf_dvb_s2_modeadapt_acm = -1; static int hf_dvb_s2_modeadapt_acm_fecframe = -1; static int hf_dvb_s2_modeadapt_acm_pilot = -1; static int hf_dvb_s2_modeadapt_acm_modcod = -1; static int hf_dvb_s2_modeadapt_acm_modcod_s2x = -1; static int hf_dvb_s2_modeadapt_cni = -1; static int hf_dvb_s2_modeadapt_frameno = -1; static int proto_dvb_s2_bb = -1; static int hf_dvb_s2_bb_matype1 = -1; static int hf_dvb_s2_bb_matype1_gs = -1; static int hf_dvb_s2_bb_matype1_mis = -1; static int hf_dvb_s2_bb_matype1_acm = -1; static int hf_dvb_s2_bb_matype1_issyi = -1; static int hf_dvb_s2_bb_matype1_npd = -1; static int hf_dvb_s2_bb_matype1_high_ro = -1; static int hf_dvb_s2_bb_matype1_low_ro = -1; static int hf_dvb_s2_bb_matype2 = -1; static int hf_dvb_s2_bb_upl = -1; static int hf_dvb_s2_bb_dfl = -1; static int hf_dvb_s2_bb_sync = -1; static int hf_dvb_s2_bb_syncd = -1; static int hf_dvb_s2_bb_crc = -1; static int hf_dvb_s2_bb_crc_status = -1; static int hf_dvb_s2_bb_df = -1; static int hf_dvb_s2_bb_eip_crc32 = -1; static int hf_dvb_s2_bb_eip_crc32_status = -1; static int hf_dvb_s2_bb_up_crc = -1; static int hf_dvb_s2_bb_up_crc_status = -1; static int hf_dvb_s2_bb_issy_short = -1; static int hf_dvb_s2_bb_issy_long = -1; static int hf_dvb_s2_bb_dnp = -1; static int hf_dvb_s2_bb_packetized = -1; static int hf_dvb_s2_bb_transport = -1; static int hf_dvb_s2_bb_reserved = -1; static int proto_dvb_s2_gse = -1; static int hf_dvb_s2_gse_hdr = -1; static int hf_dvb_s2_gse_hdr_start = -1; static int hf_dvb_s2_gse_hdr_stop = -1; static int hf_dvb_s2_gse_hdr_labeltype = -1; static int hf_dvb_s2_gse_hdr_length = -1; static int hf_dvb_s2_gse_padding = -1; static int hf_dvb_s2_gse_proto_next_header = -1; static int hf_dvb_s2_gse_proto_ethertype = -1; static int hf_dvb_s2_gse_label6 = -1; static int hf_dvb_s2_gse_label3 = -1; static int hf_dvb_s2_gse_fragid = -1; static int hf_dvb_s2_gse_totlength = -1; static int hf_dvb_s2_gse_exthdr = -1; static int hf_dvb_s2_gse_ncr = -1; static int hf_dvb_s2_gse_data = -1; static int hf_dvb_s2_gse_crc32 = -1; static int hf_dvb_s2_gse_crc32_status = -1; /* Initialize the subtree pointers */ static gint ett_dvb_s2_modeadapt = -1; static gint ett_dvb_s2_modeadapt_acm = -1; static gint ett_dvb_s2_bb = -1; static gint ett_dvb_s2_bb_matype1 = -1; static gint ett_dvb_s2_gse = -1; static gint ett_dvb_s2_gse_hdr = -1; static gint ett_dvb_s2_gse_ncr = -1; static expert_field ei_dvb_s2_bb_crc = EI_INIT; static expert_field ei_dvb_s2_bb_header_ambiguous = EI_INIT; static expert_field ei_dvb_s2_bb_issy_invalid = EI_INIT; static expert_field ei_dvb_s2_bb_npd_invalid = EI_INIT; static expert_field ei_dvb_s2_bb_upl_invalid = EI_INIT; static expert_field ei_dvb_s2_bb_dfl_invalid = EI_INIT; static expert_field ei_dvb_s2_bb_sync_invalid = EI_INIT; static expert_field ei_dvb_s2_bb_syncd_invalid = EI_INIT; static expert_field ei_dvb_s2_bb_up_reassembly_invalid = EI_INIT; static expert_field ei_dvb_s2_bb_reserved = EI_INIT; static expert_field ei_dvb_s2_gse_length_invalid = EI_INIT; static expert_field ei_dvb_s2_gse_totlength_invalid = EI_INIT; static expert_field ei_dvb_s2_gse_crc32 = EI_INIT; /* Reassembly support */ /* ETSI TS 102 606-1 3.1 distinguishes "slicing", the splitting of a User * Packet over consecutive Base Band Frames of the same stream, and * "fragmentation", the splitting of a PDU (& optionally Extension Header) * over multiple GSE packets. * * Slicing does not occur with GSE as carried in DVB-S2 according to the * original method in ETSI EN 302 307-1 (TS/GS bits 01), but it does occur * with Transport Streams, Generic Packetized Streams (non-GSE, deprecated), * and with the GSE High Efficiency Mode used in DVB-C2, DVB-T2, and DVB-S2X * (TS/GS bits 10, originally reserved.) * * According to ETSI TS 102 606-1 D.2.2 "Fragmention", for simplicity when * GSE-HEM and thus slicing is used, PDU fragmentation is not performed * on the GSE layer (but note it's possible to mix stream types in one * capture.) * * We have two sets of fragment items, one for slicing of User Packets at the * BBF level, and one for GSE fragmentation. We only have one reassembly table, * however, as the slicing of User Packets is handled through the stream.h * API. */ static gint ett_dvbs2_fragments = -1; static gint ett_dvbs2_fragment = -1; static int hf_dvbs2_fragments = -1; static int hf_dvbs2_fragment = -1; static int hf_dvbs2_fragment_overlap = -1; static int hf_dvbs2_fragment_overlap_conflict = -1; static int hf_dvbs2_fragment_multiple_tails = -1; static int hf_dvbs2_fragment_too_long_fragment = -1; static int hf_dvbs2_fragment_error = -1; static int hf_dvbs2_fragment_count = -1; static int hf_dvbs2_reassembled_in = -1; static int hf_dvbs2_reassembled_length = -1; static int hf_dvbs2_reassembled_data = -1; static const fragment_items dvbs2_frag_items = { &ett_dvbs2_fragment, &ett_dvbs2_fragments, &hf_dvbs2_fragments, &hf_dvbs2_fragment, &hf_dvbs2_fragment_overlap, &hf_dvbs2_fragment_overlap_conflict, &hf_dvbs2_fragment_multiple_tails, &hf_dvbs2_fragment_too_long_fragment, &hf_dvbs2_fragment_error, &hf_dvbs2_fragment_count, &hf_dvbs2_reassembled_in, &hf_dvbs2_reassembled_length, &hf_dvbs2_reassembled_data, "DVB-S2 UP fragments" }; static reassembly_table dvb_s2_gse_reassembly_table; static void dvb_s2_gse_defragment_init(void) { reassembly_table_init(&dvb_s2_gse_reassembly_table, &addresses_reassembly_table_functions); } static gint ett_dvb_s2_gse_fragments = -1; static gint ett_dvb_s2_gse_fragment = -1; static int hf_dvb_s2_gse_fragments = -1; static int hf_dvb_s2_gse_fragment = -1; static int hf_dvb_s2_gse_fragment_overlap = -1; static int hf_dvb_s2_gse_fragment_overlap_conflict = -1; static int hf_dvb_s2_gse_fragment_multiple_tails = -1; static int hf_dvb_s2_gse_fragment_too_long_fragment = -1; static int hf_dvb_s2_gse_fragment_error = -1; static int hf_dvb_s2_gse_fragment_count = -1; static int hf_dvb_s2_gse_reassembled_in = -1; static int hf_dvb_s2_gse_reassembled_length = -1; static int hf_dvb_s2_gse_reassembled_data = -1; static const fragment_items dvb_s2_gse_frag_items = { &ett_dvb_s2_gse_fragment, &ett_dvb_s2_gse_fragments, &hf_dvb_s2_gse_fragments, &hf_dvb_s2_gse_fragment, &hf_dvb_s2_gse_fragment_overlap, &hf_dvb_s2_gse_fragment_overlap_conflict, &hf_dvb_s2_gse_fragment_multiple_tails, &hf_dvb_s2_gse_fragment_too_long_fragment, &hf_dvb_s2_gse_fragment_error, &hf_dvb_s2_gse_fragment_count, &hf_dvb_s2_gse_reassembled_in, &hf_dvb_s2_gse_reassembled_length, &hf_dvb_s2_gse_reassembled_data, "DVB-S2 GSE fragments" }; static unsigned char _use_low_rolloff_value = 0; /* Offset in SYNC MARKER */ #define DVB_S2_OFFS_SYNCBYTE 0 /* *** DVB-S2 Modeadaption Header *** */ /* first byte */ #define DVB_S2_MODEADAPT_OFFS_SYNCBYTE 0 #define DVB_S2_MODEADAPT_SYNCBYTE 0xB8 /* second byte */ #define DVB_S2_MODEADAPT_OFFS_ACMBYTE 1 #define DVB_S2_MODEADAPT_MODCODS_MASK 0x1F #define DVB_S2_MODEADAPT_MODCODS_S2X_MASK 0xDF static const value_string modeadapt_modcods[] = { { 0, "DUMMY PLFRAME"}, { 1, "QPSK 1/4"}, { 2, "QPSK 1/3"}, { 3, "QPSK 2/5"}, { 4, "QPSK 1/2"}, { 5, "QPSK 3/5"}, { 6, "QPSK 2/3"}, { 7, "QPSK 3/4"}, { 8, "QPSK 4/5"}, { 9, "QPSK 5/6"}, {10, "QPSK 8/9"}, {11, "QPSK 9/10"}, {12, "8PSK 3/5"}, {13, "8PSK 2/3"}, {14, "8PSK 3/4"}, {15, "8PSK 5/6"}, {16, "8PSK 8/9"}, {17, "8PSK 9/10"}, {18, "16APSK 2/3"}, {19, "16APSK 3/4"}, {20, "16APSK 4/5"}, {21, "16APSK 5/6"}, {22, "16APSK 8/9"}, {23, "16APSK 9/10"}, {24, "32APSK 3/4"}, {25, "32APSK 4/5"}, {26, "32APSK 5/6"}, {27, "32APSK 8/9"}, {28, "32APSK 9/10"}, {29, "reserved"}, {30, "reserved"}, {31, "reserved"}, {32, "QPSK 1/3 SF48"}, {33, "QPSK 1/2 SF48"}, {34, "QPSK 1/4 SF12"}, {35, "QPSK 1/3 SF12"}, {36, "QPSK 1/2 SF12"}, {37, "QPSK 1/3 SF6"}, {38, "QPSK 1/2 SF6"}, {39, "QPSK 1/3 SF3"}, {40, "QPSK 2/5 SF3"}, {41, "QPSK 1/3 SF2"}, {42, "QPSK 2/5 SF2"}, {43, "QPSK 1/2 SF2"}, {44, "QPSK 1/3 SF1"}, {45, "QPSK 2/5 SF1"}, {46, "QPSK 1/2 SF1"}, {47, "reserved"}, {48, "reserved"}, {49, "reserved"}, {50, "reserved"}, {51, "reserved"}, {52, "reserved"}, {53, "reserved"}, {54, "reserved"}, {55, "reserved"}, {56, "reserved"}, {57, "reserved"}, {58, "reserved"}, {59, "reserved"}, {60, "reserved"}, {61, "reserved"}, {62, "reserved"}, {63, "reserved"}, {64, "reserved"}, {65, "reserved"}, {66, "reserved"}, {67, "reserved"}, {68, "reserved"}, {69, "reserved"}, {70, "reserved"}, {71, "reserved"}, {72, "reserved"}, {73, "reserved"}, {74, "reserved"}, {75, "reserved"}, {76, "reserved"}, {77, "reserved"}, {78, "reserved"}, {79, "reserved"}, {80, "reserved"}, {81, "reserved"}, {82, "reserved"}, {83, "reserved"}, {84, "reserved"}, {85, "reserved"}, {86, "reserved"}, {87, "reserved"}, {88, "reserved"}, {89, "reserved"}, {90, "reserved"}, {91, "reserved"}, {92, "reserved"}, {93, "reserved"}, {94, "reserved"}, {95, "reserved"}, {96, "reserved"}, {97, "reserved"}, {98, "reserved"}, {99, "reserved"}, {100, "reserved"}, {101, "reserved"}, {102, "reserved"}, {103, "reserved"}, {104, "reserved"}, {105, "reserved"}, {106, "reserved"}, {107, "reserved"}, {108, "reserved"}, {109, "reserved"}, {110, "reserved"}, {111, "reserved"}, {112, "reserved"}, {113, "reserved"}, {114, "reserved"}, {115, "reserved"}, {116, "reserved"}, {117, "reserved"}, {118, "reserved"}, {119, "reserved"}, {120, "reserved"}, {121, "reserved"}, {122, "reserved"}, {123, "reserved"}, {124, "reserved"}, {125, "reserved"}, {126, "reserved"}, {127, "reserved"}, {128, "reserved"}, {129, "reserved"}, {130, "reserved"}, {131, "reserved"}, {132, "QPSK 13/45"}, {133, "reserved"}, {134, "QPSK 9/20"}, {135, "reserved"}, {136, "QPSK 11/20"}, {137, "reserved"}, {138, "8PSK 5/9-L"}, {139, "reserved"}, {140, "8PSK 26/45-L"}, {141, "reserved"}, {142, "8PSK 23/36"}, {143, "reserved"}, {144, "8PSK 25/36"}, {145, "reserved"}, {146, "8PSK 13/18"}, {147, "reserved"}, {148, "16APSK 1/2-L"}, {149, "reserved"}, {150, "16APSK 8/15-L"}, {151, "reserved"}, {152, "16APSK 5/9-L"}, {153, "reserved"}, {154, "16APSK 26/45"}, {155, "reserved"}, {156, "16APSK 3/5"}, {157, "reserved"}, {158, "16APSK 3/5-L"}, {159, "reserved"}, {160, "16APSK 28/45"}, {161, "reserved"}, {162, "16APSK 23/36"}, {163, "reserved"}, {164, "16APSK 2/3-L"}, {165, "reserved"}, {166, "16APSK 25/36"}, {167, "reserved"}, {168, "16APSK 13/18"}, {169, "reserved"}, {170, "16APSK 7/9"}, {171, "reserved"}, {172, "16APSK 77/90"}, {173, "reserved"}, {174, "32APSK 2/3-L"}, {175, "reserved"}, {176, "reserved"}, {177, "reserved"}, {178, "32APSK 32/45"}, {179, "reserved"}, {180, "32APSK 11/15"}, {181, "reserved"}, {182, "32APSK 7/9"}, {183, "reserved"}, {184, "64APSK 32/45-L"}, {185, "reserved"}, {186, "64APSK 11/15"}, {187, "reserved"}, {188, "reserved"}, {189, "reserved"}, {190, "64APSK 7/9"}, {191, "reserved"}, {192, "reserved"}, {193, "reserved"}, {194, "64APSK 4/5"}, {195, "reserved"}, {196, "reserved"}, {197, "reserved"}, {198, "64APSK 5/6"}, {199, "reserved"}, {200, "128APSK 3/4"}, {201, "reserved"}, {202, "128APSK 7/9"}, {203, "reserved"}, {204, "256APSK 29/45-L"}, {205, "reserved"}, {206, "256APSK 2/3-L"}, {207, "reserved"}, {208, "256APSK 31/45-L"}, {209, "reserved"}, {210, "256APSK 32/45"}, {211, "reserved"}, {212, "256APSK 11/15-L"}, {213, "reserved"}, {214, "256APSK 3/4"}, {215, "reserved"}, {216, "QPSK 11/45"}, {217, "reserved"}, {218, "QPSK 4/15"}, {219, "reserved"}, {220, "QPSK 14/45"}, {221, "reserved"}, {222, "QPSK 7/15"}, {223, "reserved"}, {224, "QPSK 8/15"}, {225, "reserved"}, {226, "QPSK 32/45"}, {227, "reserved"}, {228, "8PSK 7/15"}, {229, "reserved"}, {230, "8PSK 8/15"}, {231, "reserved"}, {232, "8PSK 26/45"}, {233, "reserved"}, {234, "8PSK 32/45"}, {235, "reserved"}, {236, "16APSK 7/15"}, {237, "reserved"}, {238, "16APSK 8/15"}, {239, "reserved"}, {240, "16APSK 26/45"}, {241, "reserved"}, {242, "16APSK 3/5"}, {243, "reserved"}, {244, "16APSK 32/45"}, {245, "reserved"}, {246, "32APSK 2/3"}, {247, "reserved"}, {248, "32APSK 32/45"}, {249, "reserved"}, {250, "reserved"}, {251, "reserved"}, {252, "reserved"}, {253, "reserved"}, {254, "reserved"}, {255, "reserved"}, { 0, NULL} }; static value_string_ext modeadapt_modcods_ext = VALUE_STRING_EXT_INIT(modeadapt_modcods); #define DVB_S2_MODEADAPT_PILOTS_MASK 0x20 #define DVB_S2_MODEADAPT_FECFRAME_MASK 0x40 static const true_false_string tfs_modeadapt_fecframe = { "short", "normal" }; /* third byte */ #define DVB_S2_MODEADAPT_OFFS_CNI 2 static const value_string modeadapt_esno[] = { { 0, "modem unlocked, SNR not available"}, { 1, "-1.000"}, { 2, "-0.875"}, { 3, "-0.750"}, { 4, "-0.625"}, { 5, "-0.500"}, { 6, "-0.375"}, { 7, "-0.250"}, { 8, "-0.125"}, { 9, "0.000"}, { 10, "0.125"}, { 11, "0.250"}, { 12, "0.375"}, { 13, "0.500"}, { 14, "0.625"}, { 15, "0.750"}, { 16, "0.875"}, { 17, "1.000"}, { 18, "1.125"}, { 19, "1.250"}, { 20, "1.375"}, { 21, "1.500"}, { 22, "1.625"}, { 23, "1.750"}, { 24, "1.875"}, { 25, "2.000"}, { 26, "2.125"}, { 27, "2.250"}, { 28, "2.375"}, { 29, "2.500"}, { 30, "2.625"}, { 31, "2.750"}, { 32, "2.875"}, { 33, "3.000"}, { 34, "3.125"}, { 35, "3.250"}, { 36, "3.375"}, { 37, "3.500"}, { 38, "3.625"}, { 39, "3.750"}, { 40, "3.875"}, { 41, "4.000"}, { 42, "4.125"}, { 43, "4.250"}, { 44, "4.375"}, { 45, "4.500"}, { 46, "4.625"}, { 47, "4.750"}, { 48, "4.875"}, { 49, "5.000"}, { 50, "5.125"}, { 51, "5.250"}, { 52, "5.375"}, { 53, "5.500"}, { 54, "5.625"}, { 55, "5.750"}, { 56, "5.875"}, { 57, "6.000"}, { 58, "6.125"}, { 59, "6.250"}, { 60, "6.375"}, { 61, "6.500"}, { 62, "6.625"}, { 63, "6.750"}, { 64, "6.875"}, { 65, "7.000"}, { 66, "7.125"}, { 67, "7.250"}, { 68, "7.375"}, { 69, "7.500"}, { 70, "7.625"}, { 71, "7.750"}, { 72, "7.875"}, { 73, "8.000"}, { 74, "8.125"}, { 75, "8.250"}, { 76, "8.375"}, { 77, "8.500"}, { 78, "8.625"}, { 79, "8.750"}, { 80, "8.875"}, { 81, "9.000"}, { 82, "9.125"}, { 83, "9.250"}, { 84, "9.375"}, { 85, "9.500"}, { 86, "9.625"}, { 87, "9.750"}, { 88, "9.875"}, { 89, "10.000"}, { 90, "10.125"}, { 91, "10.250"}, { 92, "10.375"}, { 93, "10.500"}, { 94, "10.625"}, { 95, "10.750"}, { 96, "10.875"}, { 97, "11.000"}, { 98, "11.125"}, { 99, "11.250"}, {100, "11.375"}, {101, "11.500"}, {102, "11.625"}, {103, "11.750"}, {104, "11.875"}, {105, "12.000"}, {106, "12.125"}, {107, "12.250"}, {108, "12.375"}, {109, "12.500"}, {110, "12.625"}, {111, "12.750"}, {112, "12.875"}, {113, "13.000"}, {114, "13.125"}, {115, "13.250"}, {116, "13.375"}, {117, "13.500"}, {118, "13.625"}, {119, "13.750"}, {120, "13.875"}, {121, "14.000"}, {122, "14.125"}, {123, "14.250"}, {124, "14.375"}, {125, "14.500"}, {126, "14.625"}, {127, "14.750"}, {128, "14.875"}, {129, "15.000"}, {130, "15.125"}, {131, "15.250"}, {132, "15.375"}, {133, "15.500"}, {134, "15.625"}, {135, "15.750"}, {136, "15.875"}, {137, "16.000"}, {138, "16.125"}, {139, "16.250"}, {140, "16.375"}, {141, "16.500"}, {142, "16.625"}, {143, "16.750"}, {144, "16.875"}, {145, "17.000"}, {146, "17.125"}, {147, "17.250"}, {148, "17.375"}, {149, "17.500"}, {150, "17.625"}, {151, "17.750"}, {152, "17.875"}, {153, "18.000"}, {154, "18.125"}, {155, "18.250"}, {156, "18.375"}, {157, "18.500"}, {158, "18.625"}, {159, "18.750"}, {160, "18.875"}, {161, "19.000"}, {162, "19.125"}, {163, "19.250"}, {164, "19.375"}, {165, "19.500"}, {166, "19.625"}, {167, "19.750"}, {168, "19.875"}, {169, "20.000"}, {170, "20.125"}, {171, "20.250"}, {172, "20.375"}, {173, "20.500"}, {174, "20.625"}, {175, "20.750"}, {176, "20.875"}, {177, "21.000"}, {178, "21.125"}, {179, "21.250"}, {180, "21.375"}, {181, "21.500"}, {182, "21.625"}, {183, "21.750"}, {184, "21.875"}, {185, "22.000"}, {186, "22.125"}, {187, "22.250"}, {188, "22.375"}, {189, "22.500"}, {190, "22.625"}, {191, "22.750"}, {192, "22.875"}, {193, "23.000"}, {194, "23.125"}, {195, "23.250"}, {196, "23.375"}, {197, "23.500"}, {198, "23.625"}, {199, "23.750"}, {200, "23.875"}, {201, "24.000"}, {202, "24.125"}, {203, "24.250"}, {204, "24.375"}, {205, "24.500"}, {206, "24.625"}, {207, "24.750"}, {208, "24.875"}, {209, "25.000"}, {210, "25.125"}, {211, "25.250"}, {212, "25.375"}, {213, "25.500"}, {214, "25.625"}, {215, "25.750"}, {216, "25.875"}, {217, "26.000"}, {218, "26.125"}, {219, "26.250"}, {220, "26.375"}, {221, "26.500"}, {222, "26.625"}, {223, "26.750"}, {224, "26.875"}, {225, "27.000"}, {226, "27.125"}, {227, "27.250"}, {228, "27.375"}, {229, "27.500"}, {230, "27.625"}, {231, "27.750"}, {232, "27.875"}, {233, "28.000"}, {234, "28.125"}, {235, "28.250"}, {236, "28.375"}, {237, "28.500"}, {238, "28.625"}, {239, "28.750"}, {240, "28.875"}, {241, "29.000"}, {242, "29.125"}, {243, "29.250"}, {244, "29.375"}, {245, "29.500"}, {246, "29.625"}, {247, "29.750"}, {248, "29.875"}, {249, "30.000"}, {250, "30.125"}, {251, "30.250"}, {252, "30.375"}, {253, "30.500"}, {254, "30.625"}, {255, ">30.750"}, { 0, NULL} }; static value_string_ext modeadapt_esno_ext = VALUE_STRING_EXT_INIT(modeadapt_esno); /* fourth byte */ #define DVB_S2_MODEADAPT_OFFS_FNO 3 /* *** DVB-S2 Base-Band Frame *** */ #define DVB_S2_BB_HEADER_LEN ((guint)10) #define DVB_S2_BB_OFFS_MATYPE1 0 #define DVB_S2_BB_TSGS_MASK 0xC0 #define DVB_S2_BB_TSGS_GENERIC_PACKETIZED 0x00 #define DVB_S2_BB_TSGS_GENERIC_CONTINUOUS 0x40 #define DVB_S2_BB_TSGS_TRANSPORT_STREAM 0xC0 #define DVB_S2_BB_TSGS_RESERVED 0x80 static const value_string bb_tsgs[] = { {0, "Generic Packetized (not GSE)"}, {1, "Generic Continuous (GSE)"}, {2, "GSE High Efficiency Mode (GSE-HEM)"}, {3, "Transport (TS)"}, {0, NULL} }; #define DVB_S2_BB_MIS_POS 5 #define DVB_S2_BB_MIS_MASK 0x20 static const true_false_string tfs_bb_mis = { "single (SIS)", "multiple (MIS)" }; #define DVB_S2_BB_ACM_MASK 0x10 static const true_false_string tfs_bb_acm = { "constant (CCM)", "adaptive (ACM)" }; #define DVB_S2_BB_ISSYI_POS 3 #define DVB_S2_BB_ISSYI_MASK 0x08 #define DVB_S2_BB_NPD_POS 2 #define DVB_S2_BB_NPD_MASK 0x04 #define DVB_S2_BB_RO_MASK 0x03 static const value_string bb_high_ro[] = { {0, "0,35"}, {1, "0,25"}, {2, "0,20"}, {3, "Low rolloff flag"}, {0, NULL} }; static const value_string bb_low_ro[] = { {0, "0,15"}, {1, "0,10"}, {2, "0,05"}, {3, "Low rolloff flag"}, {0, NULL} }; #define DVB_S2_BB_OFFS_MATYPE2 1 #define DVB_S2_BB_OFFS_UPL 2 #define DVB_S2_BB_OFFS_DFL 4 #define DVB_S2_BB_OFFS_SYNC 6 #define DVB_S2_BB_OFFS_SYNCD 7 #define DVB_S2_BB_OFFS_CRC 9 #define DVB_S2_BB_EIP_CRC32_LEN 4 #define DVB_S2_BB_SYNC_EIP_CRC32 1 /* *** DVB-S2 GSE Frame *** */ #define DVB_S2_GSE_MINSIZE 2 #define DVB_S2_GSE_OFFS_HDR 0 #define DVB_S2_GSE_HDR_START_MASK 0x8000 #define DVB_S2_GSE_HDR_START_POS 15 #define DVB_S2_GSE_HDR_STOP_MASK 0x4000 #define DVB_S2_GSE_HDR_STOP_POS 14 #define DVB_S2_GSE_HDR_LABELTYPE_MASK 0x3000 #define DVB_S2_GSE_HDR_LABELTYPE_SHIFT 12 static const value_string gse_labeltype[] = { {0, "6 byte"}, {1, "3 byte"}, {2, "0 byte (Broadcast)"}, {3, "re-use last label"}, {0, NULL} }; #define DVB_S2_GSE_HDR_LENGTH_MASK 0x0FFF #define DVB_RCS2_NCR 0x0081 #define DVB_RCS2_SIGNAL_TABLE 0x0082 static const value_string gse_proto_next_header_str[] = { /* Mandatory Extension Headers (or link-dependent type fields) for ULE (Range 0-255 decimal) */ {0x0000, "Test SNDU" }, {0x0001, "Bridged Frame" }, {0x0002, "TS-Concat" }, {0x0003, "PDU-Concat" }, {DVB_RCS2_NCR, "NCR" }, {DVB_RCS2_SIGNAL_TABLE, "Signaling Table" }, {131, "LL_RCS_DCP" }, {132, "LL_RCS_1" }, {133, "LL_RCS_TRANSEC_SYS" }, {134, "LL_RCS_TRANSEC_PAY" }, {135, "DVB-GSE_LLC" }, /* Unassigned, private, unassigned ranges */ {200, "LL_RCS_FEC_EDT" }, /* Unassigned */ /* Optional Extension Headers for ULE (Range 256-511 decimal) */ {256, "Extension-Padding" }, {257, "Timestamp" }, /* Unassigned */ {450, "LL_RCS_FEC_ADT" }, {451, "LL_CRC32" }, /* Unassigned */ {0, NULL} }; #define DVB_S2_GSE_CRC32_LEN 4 /* Virtual circuit handling * * BBFrames have an Input Stream Identifier (equivalently PLP_ID in -T2, -C2), * but (cf. H.223), we are likely to encounter Base Band Frames over UDP or RTP. * In those situations, the ISI might be reused on different conversations * (or unused/0 on all of them). So we have a hash table that maps the * conversation and the ISI to a unique virtual stream identifier. */ typedef struct { const conversation_t* conv; guint32 isi; } virtual_stream_key; static wmem_map_t *virtual_stream_hashtable = NULL; static guint virtual_stream_count = 1; /* Hash functions */ static gint virtual_stream_equal(gconstpointer v, gconstpointer w) { const virtual_stream_key *v1 = (const virtual_stream_key *)v; const virtual_stream_key *v2 = (const virtual_stream_key *)w; gint result; result = (v1->conv == v2->conv && v1->isi == v2->isi); return result; } static guint virtual_stream_hash(gconstpointer v) { const virtual_stream_key *key = (const virtual_stream_key *)v; guint hash_val = (GPOINTER_TO_UINT(key->conv)) ^ (key->isi << 16); return hash_val; } static guint32 virtual_stream_lookup(const conversation_t* conv, guint32 isi) { virtual_stream_key key, *new_key; guint32 virtual_isi; key.conv = conv; key.isi = isi; virtual_isi = GPOINTER_TO_UINT(wmem_map_lookup(virtual_stream_hashtable, &key)); if (virtual_isi == 0) { new_key = wmem_new(wmem_file_scope(), virtual_stream_key); *new_key = key; virtual_isi = virtual_stream_count++; wmem_map_insert(virtual_stream_hashtable, new_key, GUINT_TO_POINTER(virtual_isi)); } return virtual_isi; } static void virtual_stream_init(void) { virtual_stream_count = 1; } /* Data that is associated with one BBFrame, used by GSE or TS packets * contained within it. Lifetime of the packet. */ typedef struct { address src; address dst; port_type ptype; guint32 srcport; guint32 destport; guint8 isi; } dvbs2_bb_data; /* GSE defragmentation related data, one set of data per conversation. * Two tables are used. One is for the first pass, and contains the most * recent information for each Frag ID for that conversation. The other is * for later random access, indexed by both packet number and Frag ID. * (It seems very unlikely according to the spec that the same Frag ID would * be reused on the same BBFrame that it was completed. If that does happen, * then we would have to index by something else, say, subpacket number in the * BBFrame (which we would have to track ourselves.) */ typedef struct { wmem_tree_t *fragid_table; wmem_tree_t *subpacket_table; } gse_analysis_data; typedef struct { guint8 labeltype; } gse_frag_data; static gse_analysis_data * init_gse_analysis_data(void) { gse_analysis_data *gse_data; gse_data = wmem_new0(wmem_file_scope(), gse_analysis_data); gse_data->fragid_table = wmem_tree_new(wmem_file_scope()); gse_data->subpacket_table = wmem_tree_new(wmem_file_scope()); return gse_data; } static gse_analysis_data * get_gse_analysis_data(conversation_t *conv) { gse_analysis_data *gse_data; gse_data = (gse_analysis_data *)conversation_get_proto_data(conv, proto_dvb_s2_gse); if (!gse_data) { gse_data = init_gse_analysis_data(); conversation_add_proto_data(conv, proto_dvb_s2_gse, gse_data); } return gse_data; } static gse_frag_data * get_gse_frag_data(gse_analysis_data *dvbs2_data, guint32 fragid, gboolean create) { gse_frag_data *frag_data; frag_data = (gse_frag_data *)wmem_tree_lookup32(dvbs2_data->fragid_table, fragid); if (!frag_data && create) { frag_data = wmem_new0(wmem_file_scope(), gse_frag_data); wmem_tree_insert32(dvbs2_data->fragid_table, fragid, (void *)frag_data); } return frag_data; } static gse_frag_data * get_gse_subpacket_data(gse_analysis_data *dvbs2_data, guint32 num, guint32 fragid, gboolean create) { gse_frag_data *subpacket_data; wmem_tree_key_t subpacket_key[3]; subpacket_key[0].length = 1; subpacket_key[0].key = # subpacket_key[1].length = 1; subpacket_key[1].key = &fragid; subpacket_key[2].length = 0; subpacket_key[2].key = NULL; subpacket_data = (gse_frag_data *)wmem_tree_lookup32_array(dvbs2_data->subpacket_table, subpacket_key); if (!subpacket_data && create) { subpacket_data = wmem_new0(wmem_file_scope(), gse_frag_data); wmem_tree_insert32_array(dvbs2_data->subpacket_table, subpacket_key, (void *)subpacket_data); } return subpacket_data; } /* *** helper functions *** */ static guint8 compute_crc8(tvbuff_t *p, guint8 len, guint offset) { int i; guint8 crc = 0, tmp; for (i = 0; i < len; i++) { tmp = tvb_get_guint8(p, offset++); crc = crc8_table[crc ^ tmp]; } return crc; } /* *** Code to actually dissect the packets *** */ static int dissect_dvb_s2_gse(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data) { int new_off = 0; guint8 labeltype, isi = 0; guint16 gse_hdr, data_len, packet_len, gse_proto = 0; guint32 fragid, totlength, crc32_calc = 0; proto_item *ti; proto_item *ttf; proto_tree *dvb_s2_gse_tree, *dvb_s2_gse_ncr_tree; tvbuff_t *next_tvb, *data_tvb; gboolean dissected = FALSE; gboolean update_col_info = TRUE; gboolean complete = FALSE; dvbs2_bb_data *pdata; conversation_t *conv; gse_analysis_data *gse_data; address save_src, save_dst; port_type save_ptype; guint32 save_srcport, save_destport; static int * const gse_header_bitfields[] = { &hf_dvb_s2_gse_hdr_start, &hf_dvb_s2_gse_hdr_stop, &hf_dvb_s2_gse_hdr_labeltype, &hf_dvb_s2_gse_hdr_length, NULL }; col_append_str(pinfo->cinfo, COL_INFO, " GSE"); /* get the GSE header */ gse_hdr = tvb_get_ntohs(tvb, DVB_S2_GSE_OFFS_HDR); labeltype = (gse_hdr & DVB_S2_GSE_HDR_LABELTYPE_MASK) >> DVB_S2_GSE_HDR_LABELTYPE_SHIFT; /* check if this is just padding, which takes up the rest of the frame */ if (BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_START_POS) && BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_STOP_POS) && labeltype == 0) { packet_len = tvb_reported_length(tvb); proto_tree_add_uint_format(tree, hf_dvb_s2_gse_padding, tvb, new_off, packet_len, packet_len, "DVB-S2 GSE Padding, Length: %d", packet_len); col_append_str(pinfo->cinfo, COL_INFO, " pad"); } else { /* Not padding, parse as a GSE Header */ copy_address_shallow(&save_src, &pinfo->src); copy_address_shallow(&save_dst, &pinfo->dst); save_ptype = pinfo->ptype; save_srcport = pinfo->srcport; save_destport = pinfo->destport; /* We restore the original addresses and ports before each * GSE packet so reassembly works. We do it here, because * we don't want to restore them after calling a subdissector * (so that the final values are that from the last protocol * in the last PDU), but we also don't want to restore them * if the remainder is just padding either, for the same reason. * So we restore them here after the test for padding. */ if (data) { // Called from the BBFrame dissector pdata = (dvbs2_bb_data *)data; isi = pdata->isi; copy_address_shallow(&pinfo->src, &pdata->src); copy_address_shallow(&pinfo->dst, &pdata->dst); pinfo->ptype = pdata->ptype; pinfo->srcport = pdata->srcport; pinfo->destport = pdata->destport; } conv = find_or_create_conversation(pinfo); gse_data = get_gse_analysis_data(conv); /* Length in header does not include header itself */ packet_len = (gse_hdr & DVB_S2_GSE_HDR_LENGTH_MASK) + 2; ti = proto_tree_add_item(tree, proto_dvb_s2_gse, tvb, 0, packet_len, ENC_NA); dvb_s2_gse_tree = proto_item_add_subtree(ti, ett_dvb_s2_gse); new_off += 2; ti = proto_tree_add_bitmask_with_flags(dvb_s2_gse_tree, tvb, DVB_S2_GSE_OFFS_HDR, hf_dvb_s2_gse_hdr, ett_dvb_s2_gse_hdr, gse_header_bitfields, ENC_BIG_ENDIAN, BMT_NO_TFS); if (packet_len > tvb_reported_length(tvb)) { expert_add_info(pinfo, ti, &ei_dvb_s2_gse_length_invalid); packet_len = tvb_reported_length(tvb); } /* If not both a start and an end packet, then it's a fragment */ if (BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_START_POS) || BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)) { proto_tree_add_item_ret_uint(dvb_s2_gse_tree, hf_dvb_s2_gse_fragid, tvb, new_off, 1, ENC_BIG_ENDIAN, &fragid); col_append_str(pinfo->cinfo, COL_INFO, "(frag) "); /* Differentiate between the same frag id on different ISI */ fragid ^= (isi << 8); new_off += 1; gse_frag_data *subpacket_data = NULL; if (!PINFO_FD_VISITED(pinfo)) { gse_frag_data *frag_data; if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_START_POS)) { frag_data = get_gse_frag_data(gse_data, fragid, TRUE); frag_data->labeltype = labeltype; /* Delete any previous in-progress reassembly if * we get a new start packet. */ data_tvb = fragment_delete(&dvb_s2_gse_reassembly_table, pinfo, fragid, NULL); /* Since we use fragment_add_seq_next, which (as part of * the fragment_*_check family) moves completed assemblies * to a new table (and only checks the completed table * after a packet is visited once), this will never return * non-NULL nor cause problems later. * If it does, something changed in the API. */ if (data_tvb != NULL) { DISSECTOR_ASSERT_NOT_REACHED(); } subpacket_data = get_gse_subpacket_data(gse_data, pinfo->num, fragid, TRUE); subpacket_data->labeltype = frag_data->labeltype; } else { frag_data = get_gse_frag_data(gse_data, fragid, FALSE); /* ETSI TS 102 601-1 A.2 Reassembly * Discard the packet if no buffer is in the re-assembly * state for the Frag ID (check with fragment_get). */ if (frag_data && fragment_get(&dvb_s2_gse_reassembly_table, pinfo, fragid, NULL)) { subpacket_data = get_gse_subpacket_data(gse_data, pinfo->num, fragid, TRUE); subpacket_data->labeltype = frag_data->labeltype; } } } else { subpacket_data = get_gse_subpacket_data(gse_data, pinfo->num, fragid, FALSE); } fragment_head *dvbs2_frag_head = NULL; if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)) { data_len = packet_len - new_off - DVB_S2_GSE_CRC32_LEN; } else { data_len = packet_len - new_off; } if (subpacket_data) { dvbs2_frag_head = fragment_add_seq_next(&dvb_s2_gse_reassembly_table, tvb, new_off, pinfo, fragid, NULL, data_len, BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)); } next_tvb = process_reassembled_data(tvb, new_off, pinfo, "Reassembled GSE", dvbs2_frag_head, &dvb_s2_gse_frag_items, &update_col_info, tree); if (next_tvb != NULL) { /* We have a reassembled packet. */ complete = TRUE; labeltype = subpacket_data->labeltype; crc32_calc = crc32_mpeg2_tvb_offset(next_tvb, 0, tvb_reported_length(next_tvb)); new_off = 0; ti = proto_tree_add_item_ret_uint(dvb_s2_gse_tree, hf_dvb_s2_gse_totlength, next_tvb, new_off, 2, ENC_BIG_ENDIAN, &totlength); new_off += 2; /* Value of totlength field does not include itself or the * CRC32. */ if (totlength != (guint32)tvb_reported_length_remaining(next_tvb, new_off)) { expert_add_info(pinfo, ti, &ei_dvb_s2_gse_totlength_invalid); } } else { next_tvb = tvb_new_subset_length(tvb, new_off, data_len); new_off = 0; if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_START_POS)) { /* Start packet, add the total length */ proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_totlength, next_tvb, new_off, 2, ENC_BIG_ENDIAN); new_off += 2; } } } else { complete = TRUE; next_tvb = tvb_new_subset_length(tvb, 0, packet_len); } if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_START_POS) || complete) { /* Start packet, decode the header */ gse_proto = tvb_get_ntohs(next_tvb, new_off); /* Protocol Type */ if (gse_proto <= 1535) { /* Type 1 (Next-Header Type field) */ proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_proto_next_header, next_tvb, new_off, 2, ENC_BIG_ENDIAN); } else { /* Type 2 (EtherType compatible Type Fields) */ proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_proto_ethertype, next_tvb, new_off, 2, ENC_BIG_ENDIAN); } new_off += 2; switch (labeltype) { case 0: if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)) col_append_str(pinfo->cinfo, COL_INFO, "6 "); proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_label6, next_tvb, new_off, 6, ENC_NA); new_off += 6; break; case 1: if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)) col_append_str(pinfo->cinfo, COL_INFO, "3 "); proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_label3, next_tvb, new_off, 3, ENC_BIG_ENDIAN); new_off += 3; break; case 2: case 3: /* TODO: Case 3 means "same as previous in the BBF." * We can treat it as no label length because nothing * is in the packet. * In the future we could save the values in packet data * and include them here as generated values. Then we * could also set expert_info if no previous packet in * the BBF had a label, or if the previous label was * zero length, both illegal according to ETSI TS * 102 606-1 A.1 "Filtering". */ if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)) col_append_str(pinfo->cinfo, COL_INFO, "0 "); break; } if (gse_proto < 0x0600 && gse_proto >= 0x100) { /* Only display optional extension headers */ /* TODO: needs to be tested */ /* TODO: implementation needs to be checked (len of ext-header??) */ proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_exthdr, next_tvb, new_off, 1, ENC_BIG_ENDIAN); new_off += 1; } } data_tvb = tvb_new_subset_remaining(next_tvb, new_off); copy_address_shallow(&pinfo->src, &save_src); copy_address_shallow(&pinfo->dst, &save_dst); pinfo->ptype = save_ptype; pinfo->srcport = save_srcport; pinfo->destport = save_destport; if (complete) { switch (gse_proto) { case ETHERTYPE_IP: if (dvb_s2_full_dissection) { call_dissector(ip_handle, data_tvb, pinfo, tree); dissected = TRUE; } break; case ETHERTYPE_IPv6: if (dvb_s2_full_dissection) { call_dissector(ipv6_handle, data_tvb, pinfo, tree); dissected = TRUE; } break; case ETHERTYPE_VLAN: if (dvb_s2_full_dissection) { call_dissector(eth_withoutfcs_handle, data_tvb, pinfo, tree); dissected = TRUE; } break; case DVB_RCS2_SIGNAL_TABLE: call_dissector(dvb_s2_table_handle, data_tvb, pinfo, tree); dissected = TRUE; break; case DVB_RCS2_NCR: ttf = proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_ncr, data_tvb, 0, -1, ENC_NA); dvb_s2_gse_ncr_tree = proto_item_add_subtree(ttf, ett_dvb_s2_gse_ncr); proto_tree_add_item(dvb_s2_gse_ncr_tree, hf_dvb_s2_gse_data, data_tvb, 0, -1, ENC_NA); dissected = TRUE; break; default: /* Not handled! TODO: expert info? */ break; } } if (!dissected) { proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_data, data_tvb, 0, -1, ENC_NA); } /* add crc32 if last fragment */ if (BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_START_POS) && BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)) { guint flags = PROTO_CHECKSUM_NO_FLAGS; if (complete) { flags = PROTO_CHECKSUM_VERIFY; } proto_tree_add_checksum(dvb_s2_gse_tree, tvb, packet_len - DVB_S2_GSE_CRC32_LEN, hf_dvb_s2_gse_crc32, hf_dvb_s2_gse_crc32_status, &ei_dvb_s2_gse_crc32, pinfo, crc32_calc, ENC_BIG_ENDIAN, flags); } } return packet_len; } static gboolean test_dvb_s2_crc(tvbuff_t *tvb, guint offset) { guint8 input8; /* only check BB Header and return */ if (tvb_captured_length(tvb) < (offset + DVB_S2_BB_HEADER_LEN)) return FALSE; input8 = tvb_get_guint8(tvb, offset + DVB_S2_BB_OFFS_CRC); if (compute_crc8(tvb, DVB_S2_BB_HEADER_LEN - 1, offset) != input8) return FALSE; else return TRUE; } static int dissect_dvb_s2_bb(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) { proto_item *ti; proto_tree *dvb_s2_bb_tree; tvbuff_t *sync_tvb = NULL, *tsp_tvb = NULL, *next_tvb = NULL; conversation_t *conv, *subcircuit; stream_t *ts_stream; stream_pdu_fragment_t *ts_frag; fragment_head *fd_head; dvbs2_bb_data *pdata; gboolean npd, composite_init = FALSE; guint8 input8, matype1, crc8, isi = 0, issyi; guint8 sync_flag = 0; guint16 input16, bb_data_len = 0, user_packet_length, syncd; guint32 virtual_id; guint flags; int sub_dissected = 0, flag_is_ms = 0, new_off = 0; static int * const bb_header_bitfields[] = { &hf_dvb_s2_bb_matype1_gs, &hf_dvb_s2_bb_matype1_mis, &hf_dvb_s2_bb_matype1_acm, &hf_dvb_s2_bb_matype1_issyi, &hf_dvb_s2_bb_matype1_npd, &hf_dvb_s2_bb_matype1_low_ro, NULL }; col_append_str(pinfo->cinfo, COL_PROTOCOL, "BB "); col_append_str(pinfo->cinfo, COL_INFO, "Baseband "); /* create display subtree for the protocol */ ti = proto_tree_add_item(tree, proto_dvb_s2_bb, tvb, 0, DVB_S2_BB_HEADER_LEN, ENC_NA); dvb_s2_bb_tree = proto_item_add_subtree(ti, ett_dvb_s2_bb); matype1 = tvb_get_guint8(tvb, DVB_S2_BB_OFFS_MATYPE1); new_off += 1; if (BIT_IS_CLEAR(matype1, DVB_S2_BB_MIS_POS)) flag_is_ms = 1; proto_tree_add_bitmask_with_flags(dvb_s2_bb_tree, tvb, DVB_S2_BB_OFFS_MATYPE1, hf_dvb_s2_bb_matype1, ett_dvb_s2_bb_matype1, bb_header_bitfields, ENC_BIG_ENDIAN, BMT_NO_FLAGS); issyi = (matype1 & DVB_S2_BB_ISSYI_MASK) >> DVB_S2_BB_ISSYI_POS; npd = (matype1 & DVB_S2_BB_NPD_MASK) >> DVB_S2_BB_NPD_POS; if ((pinfo->fd->num == 1) && (_use_low_rolloff_value != 0)) { _use_low_rolloff_value = 0; } if (((matype1 & DVB_S2_BB_RO_MASK) == 3) && !_use_low_rolloff_value) { _use_low_rolloff_value = 1; } if (_use_low_rolloff_value) { proto_tree_add_item(dvb_s2_bb_tree, hf_dvb_s2_bb_matype1_low_ro, tvb, DVB_S2_BB_OFFS_MATYPE1, 1, ENC_BIG_ENDIAN); } else { proto_tree_add_item(dvb_s2_bb_tree, hf_dvb_s2_bb_matype1_high_ro, tvb, DVB_S2_BB_OFFS_MATYPE1, 1, ENC_BIG_ENDIAN); } input8 = tvb_get_guint8(tvb, DVB_S2_BB_OFFS_MATYPE2); new_off += 1; if (flag_is_ms) { proto_tree_add_uint_format_value(dvb_s2_bb_tree, hf_dvb_s2_bb_matype2, tvb, DVB_S2_BB_OFFS_MATYPE2, 1, input8, "Input Stream Identifier (ISI): %d", input8); isi = input8; } else { proto_tree_add_uint_format_value(dvb_s2_bb_tree, hf_dvb_s2_bb_matype2, tvb, DVB_S2_BB_OFFS_MATYPE2, 1, input8, "reserved"); } user_packet_length = input16 = tvb_get_ntohs(tvb, DVB_S2_BB_OFFS_UPL); new_off += 2; proto_tree_add_uint_format(dvb_s2_bb_tree, hf_dvb_s2_bb_upl, tvb, DVB_S2_BB_OFFS_UPL, 2, input16, "User Packet Length: %d bits (%d bytes)", (guint16) input16, (guint16) input16 / 8); new_off += 2; bb_data_len = input16 = tvb_get_ntohs(tvb, DVB_S2_BB_OFFS_DFL); bb_data_len /= 8; if (bb_data_len + DVB_S2_BB_HEADER_LEN > tvb_reported_length(tvb)) { /* DFL can be less than the length of the BBFrame (zero padding is * applied, see ETSI EN 302 307-1 5.2.1), but cannot be greater * than the frame length (minus 10 bytes of header). */ expert_add_info(pinfo, ti, &ei_dvb_s2_bb_dfl_invalid); bb_data_len = tvb_reported_length_remaining(tvb, DVB_S2_BB_HEADER_LEN); } proto_tree_add_uint_format_value(dvb_s2_bb_tree, hf_dvb_s2_bb_dfl, tvb, DVB_S2_BB_OFFS_DFL, 2, input16, "%d bits (%d bytes)", input16, input16 / 8); new_off += 1; sync_flag = tvb_get_guint8(tvb, DVB_S2_BB_OFFS_SYNC); proto_tree_add_item(dvb_s2_bb_tree, hf_dvb_s2_bb_sync, tvb, DVB_S2_BB_OFFS_SYNC, 1, ENC_BIG_ENDIAN); new_off += 2; syncd = tvb_get_ntohs(tvb, DVB_S2_BB_OFFS_SYNCD); proto_tree_add_uint_format_value(dvb_s2_bb_tree, hf_dvb_s2_bb_syncd, tvb, DVB_S2_BB_OFFS_SYNCD, 2, syncd, "%d bits (%d bytes)", syncd, syncd >> 3); new_off += 1; proto_tree_add_checksum(dvb_s2_bb_tree, tvb, DVB_S2_BB_OFFS_CRC, hf_dvb_s2_bb_crc, hf_dvb_s2_bb_crc_status, &ei_dvb_s2_bb_crc, pinfo, compute_crc8(tvb, DVB_S2_BB_HEADER_LEN - 1, 0), ENC_NA, PROTO_CHECKSUM_VERIFY); /* The Base-Band Frame can have multiple GSE (or TS, which can have ULE * or MPE) packets that are concatenated, can be fragmented, and can call * subdissectors including IP (which itself can be fragmented) that * overwrite the pinfo addresses & ports, which are used as keys for * reassembly tables, conversations, and other purposes. * * Thus, we need to save the current values before any subdissectors * are run, and restore them each time before each subpacket. * * When BBFrames are carried over UDP or RTP we can't necessarily rely on * the ISI being unique - a capture might include different streams sent * as single input streams or with the same ISI over different UDP * endpoints and we don't want to mix data when defragmenting. So we * create a virtual ISI. */ conv = find_conversation_pinfo(pinfo, 0); /* UDP and RTP both always create conversations. If we later have * support for DVB Base Band Frames as the link-layer of a capture file, * we'll need to handle it differently. In that case just use the * ISI directly in conversation_new_by_id() instead of creating a * virtual stream identifier. */ if (conv) { virtual_id = virtual_stream_lookup(conv, isi); /* DVB Base Band streams are unidirectional. Differentiate by direction * for the unlikely case of two streams between the same endpoints in * the opposite direction. */ if (addresses_equal(&pinfo->src, conversation_key_addr1(conv->key_ptr))) { pinfo->p2p_dir = P2P_DIR_SENT; } else { pinfo->p2p_dir = P2P_DIR_RECV; } } else { virtual_id = isi; pinfo->p2p_dir = P2P_DIR_SENT; } subcircuit = find_conversation_by_id(pinfo->num, ENDPOINT_DVBBBF, virtual_id, 0); if (subcircuit == NULL) { subcircuit = conversation_new_by_id(pinfo->num, ENDPOINT_DVBBBF, virtual_id, 0); } /* conversation_create_endpoint() could be useful for the subdissectors * this calls (whether GSE or TS, and replace passing the packet data * below), but it could cause problems when the subdissectors of those * subdissectors try and call find_or_create_conversation(). * pinfo->use_endpoint doesn't affect reassembly tables in the default * reassembly functions, either. So maybe the eventual approach is * to create an endpoint but set pinfo->use_endpoint back to FALSE, and * also make the GSE and MP2T dissectors more (DVB BBF) endpoint aware, * including in their reassembly functions. */ pdata = wmem_new0(pinfo->pool, dvbs2_bb_data); copy_address_shallow(&pdata->src, &pinfo->src); copy_address_shallow(&pdata->dst, &pinfo->dst); pdata->ptype = pinfo->ptype; pdata->srcport = pinfo->srcport; pdata->destport = pinfo->destport; pdata->isi = isi; switch (matype1 & DVB_S2_BB_TSGS_MASK) { case DVB_S2_BB_TSGS_GENERIC_CONTINUOUS: /* Check GSE constraints on the BB header per 9.2.1 of ETSI TS 102 771 */ if (issyi) { expert_add_info(pinfo, ti, &ei_dvb_s2_bb_issy_invalid); } if (npd) { expert_add_info(pinfo, ti, &ei_dvb_s2_bb_npd_invalid); } if (user_packet_length != 0x0000) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_upl_invalid, "UPL is 0x%04x. It must be 0x0000 for GSE packets.", user_packet_length); } if (dvb_s2_df_dissection) { while (bb_data_len) { if (sync_flag == DVB_S2_BB_SYNC_EIP_CRC32 && bb_data_len == DVB_S2_BB_EIP_CRC32_LEN) { proto_tree_add_checksum(dvb_s2_bb_tree, tvb, new_off, hf_dvb_s2_bb_eip_crc32, hf_dvb_s2_bb_eip_crc32_status, &ei_dvb_s2_bb_crc, pinfo, crc32_mpeg2_tvb_offset(tvb, DVB_S2_BB_HEADER_LEN, new_off - DVB_S2_BB_HEADER_LEN), ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY); bb_data_len = 0; new_off += DVB_S2_BB_EIP_CRC32_LEN; } else { /* start DVB-GSE dissector */ sub_dissected = dissect_dvb_s2_gse(tvb_new_subset_length(tvb, new_off, bb_data_len), pinfo, tree, pdata); new_off += sub_dissected; if ((sub_dissected <= bb_data_len) && (sub_dissected >= DVB_S2_GSE_MINSIZE)) { bb_data_len -= sub_dissected; if (bb_data_len < DVB_S2_GSE_MINSIZE) bb_data_len = 0; } else { bb_data_len = 0; } } } } else { proto_tree_add_item(dvb_s2_bb_tree, hf_dvb_s2_bb_df, tvb, new_off, bb_data_len, ENC_NA); new_off += bb_data_len; } break; case DVB_S2_BB_TSGS_GENERIC_PACKETIZED: proto_tree_add_item(tree, hf_dvb_s2_bb_packetized, tvb, new_off, bb_data_len, ENC_NA); new_off += bb_data_len; break; case DVB_S2_BB_TSGS_TRANSPORT_STREAM: crc8 = 0; // TODO: Save from frame to frame to test the first TSP when syncd == 0? flags = PROTO_CHECKSUM_NO_FLAGS; /* Check TS constraints on the BB header per 5.1 of ETSI EN 302 307 */ if (sync_flag != MP2T_SYNC_BYTE) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_sync_invalid, "Copy of User Packet Sync is 0x%02x. It must be 0x%02x for TS packets.", sync_flag, MP2T_SYNC_BYTE); } /* ETSI 302 307-1 5.1.6: SYNCD == 0xFFFF -> "no UP starts in the * DATA FIELD"; otherwise it should not point past the UPL. */ if (syncd != 0xFFFF && (syncd >> 3) >= bb_data_len) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_syncd_invalid, "SYNCD >= DFL (points past the end of the Data Field)"); syncd = 0xFFFF; } /* Assume byte aligned. */ user_packet_length >>= 3; /* UPL should be *at least* MP2T_PACKET_SIZE, depending on npd (1 byte) * and issy (2 or 3 bytes). The fields are overdetermined (something * addressed in -C2 and -T2's High Efficency Mode for TS), so how to * process in the case of inconsistency is a judgment call. The * approach here is to disable anything for which there is insufficent * room, but not to enable anything marked as inactive. */ switch (user_packet_length) { case MP2T_PACKET_SIZE: if (issyi) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_issy_invalid, "ISSYI is active on TS but UPL is only %d bytes", user_packet_length); issyi = 0; } if (npd) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_npd_invalid, "NPD is active on TS but UPL is only %d bytes", user_packet_length); npd = FALSE; } break; case MP2T_PACKET_SIZE + 1: if (issyi) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_issy_invalid, "ISSYI is active on TS but UPL is only %d bytes", user_packet_length); issyi = 0; } if (!npd) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_npd_invalid, "NPD is inactive on TS but UPL is %d bytes", user_packet_length); } break; case MP2T_PACKET_SIZE + 2: if (!issyi) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_issy_invalid, "ISSYI is inactive on TS but UPL is %d bytes", user_packet_length); } else { issyi = 2; } if (npd) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_npd_invalid, "NPD is active on TS but UPL is %d bytes", user_packet_length); npd = FALSE; } break; case MP2T_PACKET_SIZE + 3: if (npd) { if (!issyi) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_issy_invalid, "ISSYI is inactive on TS with NPD active but UPL is %d bytes", user_packet_length); } else { issyi = 2; } } else { if (!issyi) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_issy_invalid, "ISSYI is inactive on TS with NPD inactive but UPL is %d bytes", user_packet_length); } else { issyi = 3; } } break; case MP2T_PACKET_SIZE + 4: if (!issyi) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_issy_invalid, "ISSYI is inactive on TS but UPL is %d bytes", user_packet_length); } else { issyi = 3; } if (!npd) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_npd_invalid, "NPD is inactive on TS but UPL is %d bytes", user_packet_length); } break; default: expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_upl_invalid, "UPL is %d byte%s. It must be between %d and %d bytes for TS packets.", user_packet_length, plurality(user_packet_length, "", "s"), MP2T_PACKET_SIZE, MP2T_PACKET_SIZE+4); if (user_packet_length < MP2T_PACKET_SIZE) { user_packet_length = 0; } break; } if (dvb_s2_df_dissection && user_packet_length) { sync_tvb = tvb_new_subset_length(tvb, DVB_S2_BB_OFFS_SYNC, 1); ts_stream = find_stream(subcircuit, pinfo->p2p_dir); if (ts_stream == NULL) { ts_stream = stream_new(subcircuit, pinfo->p2p_dir); } if (syncd == 0xFFFF) { /* Largely theoretical for TS (cf. Generic Packetized, GSE-HEM) * due to the small size of TSPs versus transmitted BBFrames. */ next_tvb = tvb_new_subset_length(tvb, new_off, bb_data_len); ts_frag = stream_find_frag(ts_stream, pinfo->num, new_off); if (ts_frag == NULL) { ts_frag = stream_add_frag(ts_stream, pinfo->num, new_off, next_tvb, pinfo, TRUE); } stream_process_reassembled(next_tvb, 0, pinfo, "Reassembled TSP", ts_frag, &dvbs2_frag_items, NULL, tree); new_off += bb_data_len; } else { syncd >>= 3; /* Do this even if syncd is zero just to clear out a partial * fragment from before in the case of drops or out of order. */ next_tvb = tvb_new_subset_length(tvb, new_off, syncd); ts_frag = stream_find_frag(ts_stream, pinfo->num, new_off); if (ts_frag == NULL) { ts_frag = stream_add_frag(ts_stream, pinfo->num, new_off, next_tvb, pinfo, FALSE); } fd_head = stream_get_frag_data(ts_frag); /* Don't put anything in the tree when SYNCD is 0 and there was * no earlier fragment (i.e., zero length reassembly) */ if (syncd || (fd_head && fd_head->datalen)) { next_tvb = stream_process_reassembled(next_tvb, 0, pinfo, "Reassembled TSP", ts_frag, &dvbs2_frag_items, NULL, tree); if (next_tvb && tvb_reported_length(next_tvb) == user_packet_length) { tsp_tvb = tvb_new_composite(); composite_init = TRUE; tvb_composite_append(tsp_tvb, sync_tvb); proto_tree_add_checksum(dvb_s2_bb_tree, next_tvb, 0, hf_dvb_s2_bb_up_crc, hf_dvb_s2_bb_up_crc_status, &ei_dvb_s2_bb_crc, pinfo, crc8, ENC_NA, flags); crc8 = compute_crc8(next_tvb, user_packet_length - 1, 1); flags = PROTO_CHECKSUM_VERIFY; tvb_composite_append(tsp_tvb, tvb_new_subset_length(next_tvb, 1, MP2T_PACKET_SIZE - 1)); /* XXX: ISSY is not fully dissected */ if (issyi == 2) { proto_tree_add_item(dvb_s2_bb_tree, hf_dvb_s2_bb_issy_short, next_tvb, MP2T_PACKET_SIZE, issyi, ENC_BIG_ENDIAN); } else if (issyi == 3) { proto_tree_add_item(dvb_s2_bb_tree, hf_dvb_s2_bb_issy_short, next_tvb, MP2T_PACKET_SIZE, issyi, ENC_BIG_ENDIAN); } if (npd) { proto_tree_add_item(dvb_s2_bb_tree, hf_dvb_s2_bb_dnp, next_tvb, MP2T_PACKET_SIZE + issyi, 1, ENC_NA); } } else if (pinfo->num != subcircuit->setup_frame) { /* Bad reassembly due to a dropped or out of order * packet, or maybe the previous packet cut short. */ expert_add_info(pinfo, ti, &ei_dvb_s2_bb_up_reassembly_invalid); } new_off += syncd; } } while ((bb_data_len + DVB_S2_BB_HEADER_LEN - new_off) >= user_packet_length) { proto_tree_add_checksum(dvb_s2_bb_tree, tvb, new_off, hf_dvb_s2_bb_up_crc, hf_dvb_s2_bb_up_crc_status, &ei_dvb_s2_bb_crc, pinfo, crc8, ENC_NA, flags); if (!composite_init) { tsp_tvb = tvb_new_composite(); composite_init = TRUE; } tvb_composite_append(tsp_tvb, sync_tvb); new_off++; crc8 = compute_crc8(tvb, user_packet_length - 1, new_off); flags = PROTO_CHECKSUM_VERIFY; tvb_composite_append(tsp_tvb, tvb_new_subset_length(tvb, new_off, MP2T_PACKET_SIZE - 1)); new_off += MP2T_PACKET_SIZE - 1; /* XXX: ISSY is not fully dissected */ if (issyi == 2) { proto_tree_add_item(dvb_s2_bb_tree, hf_dvb_s2_bb_issy_short, tvb, new_off, issyi, ENC_BIG_ENDIAN); } else if (issyi == 3) { proto_tree_add_item(dvb_s2_bb_tree, hf_dvb_s2_bb_issy_long, tvb, new_off, issyi, ENC_BIG_ENDIAN); } if (npd) { proto_tree_add_item(dvb_s2_bb_tree, hf_dvb_s2_bb_dnp, tvb, new_off + issyi, 1, ENC_NA); } new_off += user_packet_length - MP2T_PACKET_SIZE; } if (bb_data_len + DVB_S2_BB_HEADER_LEN - new_off) { next_tvb = tvb_new_subset_length(tvb, new_off, bb_data_len + DVB_S2_BB_HEADER_LEN - new_off); ts_frag = stream_find_frag(ts_stream, pinfo->num, new_off); if (ts_frag == NULL) { ts_frag = stream_add_frag(ts_stream, pinfo->num, new_off, next_tvb, pinfo, TRUE); } stream_process_reassembled(next_tvb, 0, pinfo, "Reassembled TSP", ts_frag, &dvbs2_frag_items, NULL, tree); } if (composite_init) { tvb_composite_finalize(tsp_tvb); add_new_data_source(pinfo, tsp_tvb, "Sync-swapped TS"); /* The way the MP2T dissector handles reassembly (using the * offsets into the TVB to store per-packet information), it * needs the entire composite TVB at once rather than be passed * one TSP at a time. That's why bb_data_len is limited to the * reported frame length, to avoid throwing an exception running * off the end before processing the TSPs that are present. */ call_dissector(mp2t_handle, tsp_tvb, pinfo, tree); } } else { proto_tree_add_item(tree, hf_dvb_s2_bb_transport, tvb, new_off, bb_data_len, ENC_NA); new_off += bb_data_len; } break; default: proto_tree_add_item(tree, hf_dvb_s2_bb_reserved, tvb, new_off, bb_data_len, ENC_NA); new_off += bb_data_len; expert_add_info(pinfo, ti, &ei_dvb_s2_bb_reserved); break; } return new_off; } static int dissect_dvb_s2_modeadapt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) { int cur_off = 0, modeadapt_len, modeadapt_type, matched_headers = 0; proto_item *ti, *tf; proto_tree *dvb_s2_modeadapt_tree; proto_tree *dvb_s2_modeadapt_acm_tree; unsigned int modcod, mc; static int * const modeadapt_acm_bitfields[] = { &hf_dvb_s2_modeadapt_acm_fecframe, &hf_dvb_s2_modeadapt_acm_pilot, &hf_dvb_s2_modeadapt_acm_modcod, NULL }; /* Check that there's enough data */ if (tvb_captured_length(tvb) < DVB_S2_MODEADAPT_MINSIZE) return 0; /* There are four different mode adaptation formats, with different length headers. Two of them have a sync byte at the beginning, but the other two do not. In every case, the mode adaptation header is followed by the baseband header, which is protected by a CRC-8. The CRC-8 is weak protection, so it can match by accident, leading to an ambiguity in identifying which format is in use. We will check for ambiguity and report it. */ /* Try L.1 format: no header. */ if (test_dvb_s2_crc(tvb, DVB_S2_MODEADAPT_L1SIZE)) { matched_headers |= (1 << DVB_S2_MODEADAPT_TYPE_L1); modeadapt_type = DVB_S2_MODEADAPT_TYPE_L1; } /* Try L.2 format: header includes sync byte */ if ((tvb_get_guint8(tvb, DVB_S2_MODEADAPT_OFFS_SYNCBYTE) == DVB_S2_MODEADAPT_SYNCBYTE) && test_dvb_s2_crc(tvb, DVB_S2_MODEADAPT_L2SIZE)) { matched_headers |= (1 << DVB_S2_MODEADAPT_TYPE_L2); modeadapt_type = DVB_S2_MODEADAPT_TYPE_L2; } /* Try L.4 format: header does not include sync byte */ if (test_dvb_s2_crc(tvb, DVB_S2_MODEADAPT_L4SIZE)) { matched_headers |= (1 << DVB_S2_MODEADAPT_TYPE_L4); modeadapt_type = DVB_S2_MODEADAPT_TYPE_L4; } /* In my experience and in product data sheets, L.3 format is the most * common for outputting over UDP or RTP, so give it highest priority * (or second highest if another is set to default) by trying it last. */ /* Try L.3 format: header includes sync byte */ if ((tvb_get_guint8(tvb, DVB_S2_MODEADAPT_OFFS_SYNCBYTE) == DVB_S2_MODEADAPT_SYNCBYTE) && test_dvb_s2_crc(tvb, DVB_S2_MODEADAPT_L3SIZE)) { matched_headers |= (1 << DVB_S2_MODEADAPT_TYPE_L3); modeadapt_type = DVB_S2_MODEADAPT_TYPE_L3; } if (matched_headers == 0) { /* This does not look like a DVB-S2-BB frame at all. We are a heuristic dissector, so we should just punt and let another dissector have a try at this one. */ return 0; } if (matched_headers & (1 << dvb_s2_default_modeadapt)) { modeadapt_type = dvb_s2_default_modeadapt; } modeadapt_len = dvb_s2_modeadapt_sizes[modeadapt_type]; col_set_str(pinfo->cinfo, COL_PROTOCOL, "DVB-S2 "); col_set_str(pinfo->cinfo, COL_INFO, "DVB-S2 "); /* Add the protocol even if no length (L.1) so we get access to prefs. */ ti = proto_tree_add_protocol_format(tree, proto_dvb_s2_modeadapt, tvb, 0, modeadapt_len, "DVB-S2 Mode Adaptation Header L.%d", modeadapt_type); if (ws_count_ones(matched_headers) > 1) { expert_add_info_format(pinfo, ti, &ei_dvb_s2_bb_header_ambiguous, "Mode adaptation header format is ambiguous. Assuming L.%d", modeadapt_type); } /* If there's a mode adaptation header, create display subtree for it */ if (modeadapt_len > 0) { dvb_s2_modeadapt_tree = proto_item_add_subtree(ti, ett_dvb_s2_modeadapt); /* SYNC byte if used in this header format; value has already been checked */ if (modeadapt_type == DVB_S2_MODEADAPT_TYPE_L2 || modeadapt_type == DVB_S2_MODEADAPT_TYPE_L3) { proto_tree_add_item(dvb_s2_modeadapt_tree, hf_dvb_s2_modeadapt_sync, tvb, cur_off, 1, ENC_BIG_ENDIAN); cur_off++; } /* ACM byte and subfields if used in this header format */ if (modeadapt_type == DVB_S2_MODEADAPT_TYPE_L2 || modeadapt_type == DVB_S2_MODEADAPT_TYPE_L3 || modeadapt_type == DVB_S2_MODEADAPT_TYPE_L4) { mc = tvb_get_guint8(tvb, 1); //mc = tvb_get_letohs(tvb, 0); if (mc & 0x80) { modcod = 0x80; modcod |= ((mc & 0x1F) << 2); modcod |= ((mc & 0x40) >> 5); tf = proto_tree_add_item(dvb_s2_modeadapt_tree, hf_dvb_s2_modeadapt_acm, tvb, DVB_S2_MODEADAPT_OFFS_ACMBYTE, 1, ENC_BIG_ENDIAN); dvb_s2_modeadapt_acm_tree = proto_item_add_subtree(tf, ett_dvb_s2_modeadapt_acm); proto_tree_add_item(dvb_s2_modeadapt_acm_tree, hf_dvb_s2_modeadapt_acm_pilot, tvb, DVB_S2_MODEADAPT_OFFS_ACMBYTE, 1, ENC_BIG_ENDIAN); proto_tree_add_uint_format_value(dvb_s2_modeadapt_acm_tree, hf_dvb_s2_modeadapt_acm_modcod_s2x, tvb, DVB_S2_MODEADAPT_OFFS_ACMBYTE, 1, mc, "DVBS2X %s(%d)", modeadapt_modcods[modcod].strptr, modcod); } else { proto_tree_add_bitmask_with_flags(dvb_s2_modeadapt_tree, tvb, DVB_S2_MODEADAPT_OFFS_ACMBYTE, hf_dvb_s2_modeadapt_acm, ett_dvb_s2_modeadapt_acm, modeadapt_acm_bitfields, ENC_BIG_ENDIAN, BMT_NO_FLAGS); } cur_off++; } /* CNI and Frame No if used in this header format */ if (modeadapt_type == DVB_S2_MODEADAPT_TYPE_L3 || modeadapt_type == DVB_S2_MODEADAPT_TYPE_L4) { proto_tree_add_item(dvb_s2_modeadapt_tree, hf_dvb_s2_modeadapt_cni, tvb, cur_off, 1, ENC_BIG_ENDIAN); cur_off++; proto_tree_add_item(dvb_s2_modeadapt_tree, hf_dvb_s2_modeadapt_frameno, tvb, cur_off, 1, ENC_BIG_ENDIAN); cur_off++; } } /* start DVB-BB dissector */ cur_off += dissect_dvb_s2_bb(tvb_new_subset_remaining(tvb, cur_off), pinfo, tree, NULL); return cur_off; } /* Register the protocol with Wireshark */ void proto_register_dvb_s2_modeadapt(void) { module_t *dvb_s2_modeadapt_module; static hf_register_info hf_modeadapt[] = { {&hf_dvb_s2_modeadapt_sync, { "Sync Byte", "dvb-s2_modeadapt.sync", FT_UINT8, BASE_HEX, NULL, 0x0, "Das Sync Byte", HFILL} }, {&hf_dvb_s2_modeadapt_acm, { "ACM command", "dvb-s2_modeadapt.acmcmd", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL} }, {&hf_dvb_s2_modeadapt_acm_fecframe, { "FEC frame size", "dvb-s2_modeadapt.acmcmd.fecframe", FT_BOOLEAN, 8, TFS(&tfs_modeadapt_fecframe), DVB_S2_MODEADAPT_FECFRAME_MASK, "FEC", HFILL} }, {&hf_dvb_s2_modeadapt_acm_pilot, { "Pilots configuration", "dvb-s2_modeadapt.acmcmd.pilots", FT_BOOLEAN, 8, TFS(&tfs_on_off), DVB_S2_MODEADAPT_PILOTS_MASK, "Pilots", HFILL} }, {&hf_dvb_s2_modeadapt_acm_modcod, { "Modcod indicator", "dvb-s2_modeadapt.acmcmd.modcod", FT_UINT8, BASE_DEC|BASE_EXT_STRING, &modeadapt_modcods_ext, DVB_S2_MODEADAPT_MODCODS_MASK, "Modcod", HFILL} }, {&hf_dvb_s2_modeadapt_acm_modcod_s2x, { "Modcod indicator", "dvb-s2_modeadapt.acmcmd.modcod", FT_UINT8, BASE_DEC|BASE_EXT_STRING, &modeadapt_modcods_ext, DVB_S2_MODEADAPT_MODCODS_S2X_MASK, "Modcod S2X", HFILL} }, {&hf_dvb_s2_modeadapt_cni, { "Carrier to Noise [dB]", "dvb-s2_modeadapt.cni", FT_UINT8, BASE_DEC|BASE_EXT_STRING, &modeadapt_esno_ext, 0x0, "CNI", HFILL} }, {&hf_dvb_s2_modeadapt_frameno, { "Frame number", "dvb-s2_modeadapt.frameno", FT_UINT8, BASE_DEC, NULL, 0x0, "fno", HFILL} } }; /* Setup protocol subtree array */ static gint *ett_modeadapt[] = { &ett_dvb_s2_modeadapt, &ett_dvb_s2_modeadapt_acm }; static hf_register_info hf_bb[] = { {&hf_dvb_s2_bb_matype1, { "MATYPE1", "dvb-s2_bb.matype1", FT_UINT8, BASE_HEX, NULL, 0x0, "MATYPE1 Header Field", HFILL} }, {&hf_dvb_s2_bb_matype1_gs, { "TS/GS Stream Input", "dvb-s2_bb.matype1.tsgs", FT_UINT8, BASE_DEC, VALS(bb_tsgs), DVB_S2_BB_TSGS_MASK, "Transport Stream Input or Generic Stream Input", HFILL} }, {&hf_dvb_s2_bb_matype1_mis, { "Input Stream", "dvb-s2_bb.matype1.mis", FT_BOOLEAN, 8, TFS(&tfs_bb_mis), DVB_S2_BB_MIS_MASK, "Single Input Stream or Multiple Input Stream", HFILL} }, {&hf_dvb_s2_bb_matype1_acm, { "Coding and Modulation", "dvb-s2_bb.matype1.acm", FT_BOOLEAN, 8, TFS(&tfs_bb_acm), DVB_S2_BB_ACM_MASK, "Constant Coding and Modulation or Adaptive Coding and Modulation", HFILL} }, {&hf_dvb_s2_bb_matype1_issyi, { "ISSYI", "dvb-s2_bb.matype1.issyi", FT_BOOLEAN, 8, TFS(&tfs_active_inactive), DVB_S2_BB_ISSYI_MASK, "Input Stream Synchronization Indicator", HFILL} }, {&hf_dvb_s2_bb_matype1_npd, { "NPD", "dvb-s2_bb.matype1.npd", FT_BOOLEAN, 8, TFS(&tfs_active_inactive), DVB_S2_BB_NPD_MASK, "Null-packet deletion enabled", HFILL} }, {&hf_dvb_s2_bb_matype1_high_ro, { "RO", "dvb-s2_bb.matype1.ro", FT_UINT8, BASE_DEC, VALS(bb_high_ro), DVB_S2_BB_RO_MASK, "Transmission Roll-off factor", HFILL} }, {&hf_dvb_s2_bb_matype1_low_ro, { "RO", "dvb-s2_bb.matype1.ro", FT_UINT8, BASE_DEC, VALS(bb_low_ro), DVB_S2_BB_RO_MASK, "Transmission Roll-off factor", HFILL} }, {&hf_dvb_s2_bb_matype2, { "MATYPE2", "dvb-s2_bb.matype2", FT_UINT8, BASE_HEX, NULL, 0x0, "MATYPE2 Header Field", HFILL} }, {&hf_dvb_s2_bb_upl, { "UPL", "dvb-s2_bb.upl", FT_UINT16, BASE_HEX, NULL, 0x0, "User Packet Length", HFILL} }, {&hf_dvb_s2_bb_dfl, { "DFL", "dvb-s2_bb.dfl", FT_UINT16, BASE_HEX, NULL, 0x0, "Data Field Length", HFILL} }, {&hf_dvb_s2_bb_sync, { "SYNC", "dvb-s2_bb.sync", FT_UINT8, BASE_HEX, NULL, 0x0, "Copy of the User Packet Sync-byte", HFILL} }, {&hf_dvb_s2_bb_syncd, { "SYNCD", "dvb-s2_bb.syncd", FT_UINT16, BASE_DEC, NULL, 0x0, "Distance to first user packet", HFILL} }, {&hf_dvb_s2_bb_crc, { "Checksum", "dvb-s2_bb.crc", FT_UINT8, BASE_HEX, NULL, 0x0, "BB Header CRC-8", HFILL} }, {&hf_dvb_s2_bb_crc_status, { "Checksum Status", "dvb-s2_bb.crc.status", FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0, NULL, HFILL} }, {&hf_dvb_s2_bb_packetized, { "Packetized Generic Stream Data", "dvb-s2_bb.packetized", FT_BYTES, BASE_NONE, NULL, 0x0, "Packetized Generic Stream (non-TS) Data", HFILL} }, {&hf_dvb_s2_bb_transport, { "Transport Stream Data", "dvb-s2_bb.transport", FT_BYTES, BASE_NONE, NULL, 0x0, "Transport Stream (TS) Data", HFILL} }, {&hf_dvb_s2_bb_reserved, { "GSE High Efficiency Mode Data", "dvb-s2_bb.reserved", FT_BYTES, BASE_NONE, NULL, 0x0, "GSE High Efficiency Mode (GSE-HEM) Data", HFILL} }, {&hf_dvb_s2_bb_df, { "BBFrame user data", "dvb-s2_bb.df", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL} }, {&hf_dvb_s2_bb_issy_short, { "ISSY (short)", "dvb-s2_bb.issy.short", FT_UINT16, BASE_HEX, NULL, 0x0, "Input stream synchronizer (2 octet version)", HFILL} }, {&hf_dvb_s2_bb_issy_long, { "ISSY (long)", "dvb-s2_bb.issy.long", FT_UINT24, BASE_HEX, NULL, 0x0, "Input stream synchronizer (3 octet version)", HFILL} }, {&hf_dvb_s2_bb_dnp, { "DNP", "dvb-s2_bb.dnp", FT_UINT8, BASE_DEC, NULL, 0x0, "Deleted Null-Packets counter", HFILL} }, {&hf_dvb_s2_bb_eip_crc32, { "EIP CRC32", "dvb-s2_bb.eip_crc32", FT_UINT32, BASE_HEX, NULL, 0x0, "Explicit Integrity Protection CRC32", HFILL} }, {&hf_dvb_s2_bb_eip_crc32_status, { "EIP CRC32 Status", "dvb-s2_bb.eip_crc32.status", FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0, NULL, HFILL} }, {&hf_dvb_s2_bb_up_crc, { "UP Checksum", "dvb-s2_bb.up.crc", FT_UINT8, BASE_HEX, NULL, 0x0, "User Packet CRC-8", HFILL} }, {&hf_dvb_s2_bb_up_crc_status, { "UP Checksum Status", "dvb-s2_bb.up.crc.status", FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0, NULL, HFILL} }, { &hf_dvbs2_fragment_overlap, { "Fragment overlap", "dvb-s2_bb.fragment.overlap", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Fragment overlaps with other fragments", HFILL }}, { &hf_dvbs2_fragment_overlap_conflict, { "Conflicting data in fragment overlap", "dvb-s2_bb.fragment.overlap.conflict", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Overlapping fragments contained conflicting data", HFILL }}, { &hf_dvbs2_fragment_multiple_tails, { "Multiple tail fragments found", "dvb-s2_bb.fragment.multipletails", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Several tails were found when defragmenting the packet", HFILL }}, { &hf_dvbs2_fragment_too_long_fragment, { "Fragment too long", "dvb-s2_bb.fragment.toolongfragment", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Fragment contained data past end of packet", HFILL }}, { &hf_dvbs2_fragment_error, { "Defragmentation error", "dvb-s2_bb.fragment.error", FT_FRAMENUM, BASE_NONE, NULL, 0x0, "Defragmentation error due to illegal fragments", HFILL }}, { &hf_dvbs2_fragment_count, { "Fragment count", "dvb-s2_bb.fragment.count", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_dvbs2_fragment, { "DVB-S2 UP Fragment", "dvb-s2_bb.fragment", FT_FRAMENUM, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_dvbs2_fragments, { "DVB-S2 UP Fragments", "dvb-s2_bb.fragments", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_dvbs2_reassembled_in, { "Reassembled DVB-S2 UP in frame", "dvb-s2_bb.reassembled_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0, "This User Packet is reassembled in this frame", HFILL }}, { &hf_dvbs2_reassembled_length, { "Reassembled DVB-S2 UP length", "dvb-s2_bb.reassembled.length", FT_UINT32, BASE_DEC, NULL, 0x0, "The total length of the reassembled payload", HFILL }}, { &hf_dvbs2_reassembled_data, { "Reassembled DVB-S2 UP data", "dvb-s2_bb.reassembled.data", FT_BYTES, BASE_NONE, NULL, 0x0, "The reassembled payload", HFILL }} }; static gint *ett_bb[] = { &ett_dvb_s2_bb, &ett_dvb_s2_bb_matype1, &ett_dvbs2_fragments, &ett_dvbs2_fragment, }; /* DVB-S2 GSE Frame */ static hf_register_info hf_gse[] = { {&hf_dvb_s2_gse_hdr, { "GSE header", "dvb-s2_gse.hdr", FT_UINT16, BASE_HEX, NULL, 0x0, "GSE Header (start/stop/length)", HFILL} }, {&hf_dvb_s2_gse_hdr_start, { "Start", "dvb-s2_gse.hdr.start", FT_BOOLEAN, 16, TFS(&tfs_enabled_disabled), DVB_S2_GSE_HDR_START_MASK, "Start Indicator", HFILL} }, {&hf_dvb_s2_gse_hdr_stop, { "Stop", "dvb-s2_gse.hdr.stop", FT_BOOLEAN, 16, TFS(&tfs_enabled_disabled), DVB_S2_GSE_HDR_STOP_MASK, "Stop Indicator", HFILL} }, {&hf_dvb_s2_gse_hdr_labeltype, { "Label Type", "dvb-s2_gse.hdr.labeltype", FT_UINT16, BASE_HEX, VALS(gse_labeltype), DVB_S2_GSE_HDR_LABELTYPE_MASK, "Label Type Indicator", HFILL} }, {&hf_dvb_s2_gse_hdr_length, { "Length", "dvb-s2_gse.hdr.length", FT_UINT16, BASE_DEC, NULL, DVB_S2_GSE_HDR_LENGTH_MASK, "GSE Length", HFILL} }, {&hf_dvb_s2_gse_padding, { "GSE Padding", "dvb-s2_gse.padding", FT_UINT16, BASE_DEC, NULL, 0x0, "GSE Padding Bytes", HFILL} }, {&hf_dvb_s2_gse_proto_next_header, { "Protocol", "dvb-s2_gse.proto", FT_UINT16, BASE_HEX, VALS(gse_proto_next_header_str), 0x0, "Protocol Type", HFILL} }, {&hf_dvb_s2_gse_proto_ethertype, { "Protocol", "dvb-s2_gse.proto", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, "Protocol Type", HFILL} }, {&hf_dvb_s2_gse_label6, { "Label", "dvb-s2_gse.label_ether", FT_ETHER, BASE_NONE, NULL, 0x0, "Label Field", HFILL} }, {&hf_dvb_s2_gse_label3, { "Label", "dvb-s2_gse.label", FT_UINT24, BASE_HEX, NULL, 0x0, "Label Field", HFILL} }, {&hf_dvb_s2_gse_fragid, { "Frag ID", "dvb-s2_gse.fragid", FT_UINT8, BASE_HEX, NULL, 0x0, "Fragment ID", HFILL} }, {&hf_dvb_s2_gse_totlength, { "Total Length", "dvb-s2_gse.totlength", FT_UINT16, BASE_DEC, NULL, 0x0, "GSE Total Frame Length", HFILL} }, {&hf_dvb_s2_gse_exthdr, { "Extension Header", "dvb-s2_gse.exthdr", FT_UINT8, BASE_HEX, NULL, 0x0, "optional Extension Header", HFILL} }, {&hf_dvb_s2_gse_ncr, { "NCR Packet", "dvb-s2_gse.ncr", FT_BYTES, BASE_NONE, NULL, 0x0, "GSE NCR PAcket", HFILL} }, {&hf_dvb_s2_gse_data, { "PDU Data", "dvb-s2_gse.data", FT_BYTES, BASE_NONE, NULL, 0x0, "GSE Frame User Data", HFILL} }, {&hf_dvb_s2_gse_crc32, { "CRC", "dvb-s2_gse.crc", FT_UINT32, BASE_HEX, NULL, 0x0, "CRC-32", HFILL} }, {&hf_dvb_s2_gse_crc32_status, { "CRC Status", "dvb-s2_gse.crc.status", FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0, NULL, HFILL} }, { &hf_dvb_s2_gse_fragment_overlap, { "Fragment overlap", "dvb-s2_gse.fragment.overlap", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Fragment overlaps with other fragments", HFILL }}, { &hf_dvb_s2_gse_fragment_overlap_conflict, { "Conflicting data in fragment overlap", "dvb-s2_gse.fragment.overlap.conflict", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Overlapping fragments contained conflicting data", HFILL }}, { &hf_dvb_s2_gse_fragment_multiple_tails, { "Multiple tail fragments found", "dvb-s2_gse.fragment.multipletails", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Several tails were found when defragmenting the packet", HFILL }}, { &hf_dvb_s2_gse_fragment_too_long_fragment, { "Fragment too long", "dvb-s2_gse.fragment.toolongfragment", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Fragment contained data past end of packet", HFILL }}, { &hf_dvb_s2_gse_fragment_error, { "Defragmentation error", "dvb-s2_gse.fragment.error", FT_FRAMENUM, BASE_NONE, NULL, 0x0, "Defragmentation error due to illegal fragments", HFILL }}, { &hf_dvb_s2_gse_fragment_count, { "Fragment count", "dvb-s2_gse.fragment.count", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_dvb_s2_gse_fragment, { "DVB-S2 GSE Fragment", "dvb-s2_gse.fragment", FT_FRAMENUM, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_dvb_s2_gse_fragments, { "DVB-S2 GSE Fragments", "dvb-s2_gse.fragments", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_dvb_s2_gse_reassembled_in, { "Reassembled DVB-S2 GSE in frame", "dvb-s2_gse.reassembled_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0, "This GSE packet is reassembled in this frame", HFILL }}, { &hf_dvb_s2_gse_reassembled_length, { "Reassembled DVB-S2 GSE length", "dvb-s2_gse.reassembled.length", FT_UINT32, BASE_DEC, NULL, 0x0, "The total length of the reassembled payload", HFILL }}, { &hf_dvb_s2_gse_reassembled_data, { "Reassembled DVB-S2 GSE data", "dvb-s2_gse.reassembled.data", FT_BYTES, BASE_NONE, NULL, 0x0, "The reassembled payload", HFILL }} }; static gint *ett_gse[] = { &ett_dvb_s2_gse, &ett_dvb_s2_gse_hdr, &ett_dvb_s2_gse_ncr, &ett_dvb_s2_gse_fragments, &ett_dvb_s2_gse_fragment, }; static ei_register_info ei[] = { { &ei_dvb_s2_bb_crc, { "dvb-s2_bb.bad_checksum", PI_CHECKSUM, PI_ERROR, "Bad checksum", EXPFILL }}, { &ei_dvb_s2_bb_issy_invalid, {"dvb-s2_bb.issy_invalid", PI_PROTOCOL, PI_WARN, "ISSY is active, which is not allowed for GSE packets", EXPFILL }}, { &ei_dvb_s2_bb_npd_invalid, {"dvb-s2_bb.npd_invalid", PI_PROTOCOL, PI_WARN, "NPD is active, which is not allowed for GSE packets", EXPFILL }}, { &ei_dvb_s2_bb_upl_invalid, {"dvb-s2_bb.upl_invalid", PI_PROTOCOL, PI_WARN, "User Packet Length non-zero, which is not allowed for GSE packets", EXPFILL }}, { &ei_dvb_s2_bb_dfl_invalid, {"dvb-s2_bb.dfl_invalid", PI_PROTOCOL, PI_WARN, "Data Field Length greater than reported frame length", EXPFILL }}, { &ei_dvb_s2_bb_sync_invalid, {"dvb-s2_bb.sync_invalid", PI_PROTOCOL, PI_WARN, "User Packet Sync-byte not 0x47, which is not allowed for TS packets", EXPFILL }}, { &ei_dvb_s2_bb_syncd_invalid, {"dvb-s2_bb.syncd_invalid", PI_PROTOCOL, PI_WARN, "Sync Distance is invalid", EXPFILL }}, { &ei_dvb_s2_bb_up_reassembly_invalid, {"dvb-s2_bb.up_reassembly_invalid", PI_REASSEMBLE, PI_ERROR, "Reassembled User Packet has invalid length (dropped or out of order frames)", EXPFILL }}, { &ei_dvb_s2_bb_reserved, {"dvb-s2_bb.reserved_frame_format", PI_UNDECODED, PI_WARN, "Dissection of GSE-HEM is not (yet) supported", EXPFILL }}, { &ei_dvb_s2_bb_header_ambiguous, { "dvb-s2_bb.header_ambiguous", PI_ASSUMPTION, PI_WARN, "Mode Adaptation header ambiguous", EXPFILL }}, }; expert_module_t* expert_dvb_s2_bb; static ei_register_info ei_gse[] = { { &ei_dvb_s2_gse_length_invalid, {"dvb-s2_gse.hdr.length_invalid", PI_PROTOCOL, PI_ERROR, "Length field in header exceeds available bytes in frame", EXPFILL }}, { &ei_dvb_s2_gse_totlength_invalid, {"dvb-s2_gse.totlength_invalid", PI_REASSEMBLE, PI_ERROR, "Length of reassembled packet does not equal total length field (missing fragments?)", EXPFILL }}, { &ei_dvb_s2_gse_crc32, { "dvb-s2_gse.bad_checksum", PI_CHECKSUM, PI_ERROR, "Bad checksum", EXPFILL }}, }; expert_module_t* expert_dvb_s2_gse; proto_dvb_s2_modeadapt = proto_register_protocol("DVB-S2 Mode Adaptation Header", "DVB-S2", "dvb-s2_modeadapt"); proto_dvb_s2_bb = proto_register_protocol("DVB-S2 Baseband Frame", "DVB-S2-BB", "dvb-s2_bb"); proto_dvb_s2_gse = proto_register_protocol("DVB-S2 GSE Packet", "DVB-S2-GSE", "dvb-s2_gse"); proto_register_field_array(proto_dvb_s2_modeadapt, hf_modeadapt, array_length(hf_modeadapt)); proto_register_subtree_array(ett_modeadapt, array_length(ett_modeadapt)); proto_register_field_array(proto_dvb_s2_bb, hf_bb, array_length(hf_bb)); proto_register_subtree_array(ett_bb, array_length(ett_bb)); expert_dvb_s2_bb = expert_register_protocol(proto_dvb_s2_bb); expert_register_field_array(expert_dvb_s2_bb, ei, array_length(ei)); proto_register_field_array(proto_dvb_s2_gse, hf_gse, array_length(hf_gse)); proto_register_subtree_array(ett_gse, array_length(ett_gse)); expert_dvb_s2_gse = expert_register_protocol(proto_dvb_s2_gse); expert_register_field_array(expert_dvb_s2_gse, ei_gse, array_length(ei_gse)); dvb_s2_modeadapt_module = prefs_register_protocol(proto_dvb_s2_modeadapt, proto_reg_handoff_dvb_s2_modeadapt); prefs_register_obsolete_preference(dvb_s2_modeadapt_module, "enable"); prefs_register_bool_preference(dvb_s2_modeadapt_module, "decode_df", "Enable dissection of DATA FIELD", "Check this to enable full protocol dissection of data above BBHeader", &dvb_s2_df_dissection); prefs_register_bool_preference(dvb_s2_modeadapt_module, "full_decode", "Enable dissection of GSE data", "Check this to enable full protocol dissection of data above GSE Layer", &dvb_s2_full_dissection); prefs_register_enum_preference(dvb_s2_modeadapt_module, "default_modeadapt", "Preferred Mode Adaptation Interface", "The preferred Mode Adaptation Interface in the case of ambiguity", &dvb_s2_default_modeadapt, dvb_s2_modeadapt_enum, FALSE); prefs_register_range_preference(dvb_s2_modeadapt_module, "dynamic.payload.type", "DVB-S2 RTP dynamic payload types", "RTP Dynamic payload types which will be interpreted as DVB-S2" "; values must be in the range 1 - 127", &temp_dynamic_payload_type_range, 127); register_init_routine(dvb_s2_gse_defragment_init); register_init_routine(&virtual_stream_init); virtual_stream_hashtable = wmem_map_new_autoreset(wmem_epan_scope(), wmem_file_scope(), virtual_stream_hash, virtual_stream_equal); dvb_s2_modeadapt_handle = register_dissector("DVB-S2 Mode adaptation header", dissect_dvb_s2_modeadapt, proto_dvb_s2_modeadapt); } void proto_reg_handoff_dvb_s2_modeadapt(void) { static range_t *dynamic_payload_type_range = NULL; static gboolean prefs_initialized = FALSE; if (!prefs_initialized) { heur_dissector_add("udp", dissect_dvb_s2_modeadapt, "DVB-S2 over UDP", "dvb_s2_udp", proto_dvb_s2_modeadapt, HEURISTIC_DISABLE); ip_handle = find_dissector_add_dependency("ip", proto_dvb_s2_bb); ipv6_handle = find_dissector_add_dependency("ipv6", proto_dvb_s2_bb); dvb_s2_table_handle = find_dissector("dvb-s2_table"); eth_withoutfcs_handle = find_dissector("eth_withoutfcs"); data_handle = find_dissector("data"); mp2t_handle = find_dissector_add_dependency("mp2t", proto_dvb_s2_bb); dissector_add_string("rtp_dyn_payload_type","DVB-S2", dvb_s2_modeadapt_handle); prefs_initialized = TRUE; } else { dissector_delete_uint_range("rtp.pt", dynamic_payload_type_range, dvb_s2_modeadapt_handle); wmem_free(wmem_epan_scope(), dynamic_payload_type_range); } dynamic_payload_type_range = range_copy(wmem_epan_scope(), temp_dynamic_payload_type_range); range_remove_value(wmem_epan_scope(), &dynamic_payload_type_range, 0); dissector_add_uint_range("rtp.pt", dynamic_payload_type_range, dvb_s2_modeadapt_handle); } /* * Editor modelines - https://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 4 * tab-width: 8 * indent-tabs-mode: nil * End: * * vi: set shiftwidth=4 tabstop=8 expandtab: * :indentSize=4:tabSize=8:noTabs=true: */