diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
commit | e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc (patch) | |
tree | 68cb5ef9081156392f1dd62a00c6ccc1451b93df /epan/dissectors/packet-gfp.c | |
parent | Initial commit. (diff) | |
download | wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.tar.xz wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.zip |
Adding upstream version 4.2.2.upstream/4.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'epan/dissectors/packet-gfp.c')
-rw-r--r-- | epan/dissectors/packet-gfp.c | 621 |
1 files changed, 621 insertions, 0 deletions
diff --git a/epan/dissectors/packet-gfp.c b/epan/dissectors/packet-gfp.c new file mode 100644 index 00000000..ec6a0f5c --- /dev/null +++ b/epan/dissectors/packet-gfp.c @@ -0,0 +1,621 @@ +/* packet-gfp.c + * Routines for Generic Framing Procedure dissection + * Copyright 2015, John Thacker <johnthacker@gmail.com> + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +/* + * Generic Framing Procedure (GFP) is used to map octet-aligned variable + * length payloads (e.g. Ethernet, MPLS, octet-aligned PPP, IP) into + * octet-synchronous signals such as SONET/SDH (ITU-T G.707) and OTN + * (ITU-T G.709). GFP is a telecommunications industry standard defined in + * ITU-T G.7041/Y.1303. + * + * Reference: + * https://www.itu.int/rec/T-REC-G.7041/ + */ + +#include <config.h> + +#include <epan/packet.h> /* Should be first Wireshark include (other than config.h) */ +#include <epan/expert.h> +#include <epan/prefs.h> +#include <epan/crc16-tvb.h> +#include <epan/crc32-tvb.h> +#include <epan/decode_as.h> +#include <epan/proto_data.h> + +#include <wiretap/wtap.h> + +/* Prototypes */ +/* (Required to prevent [-Wmissing-prototypes] warnings */ +void proto_reg_handoff_gfp(void); +void proto_register_gfp(void); + +/* Dissector handle */ +static dissector_handle_t gfp_handle; + +/* Initialize the protocol and registered fields */ +static int proto_gfp = -1; +static int hf_gfp_pli = -1; +static int hf_gfp_chec = -1; +static int hf_gfp_chec_status = -1; +static int hf_gfp_type = -1; +static int hf_gfp_pti = -1; +static int hf_gfp_pfi = -1; +static int hf_gfp_exi = -1; +static int hf_gfp_upi_data = -1; +static int hf_gfp_upi_management = -1; +static int hf_gfp_thec = -1; +static int hf_gfp_thec_status = -1; +static int hf_gfp_cid = -1; +static int hf_gfp_ehec = -1; +static int hf_gfp_ehec_status = -1; +static int hf_gfp_fcs = -1; +static int hf_gfp_fcs_good = -1; +static int hf_gfp_fcs_bad = -1; + +static expert_field ei_gfp_pli_idle_nonempty = EI_INIT; +static expert_field ei_gfp_pli_unknown = EI_INIT; +static expert_field ei_gfp_pli_invalid = EI_INIT; +static expert_field ei_gfp_chec_bad = EI_INIT; +static expert_field ei_gfp_thec_bad = EI_INIT; +static expert_field ei_gfp_ehec_bad = EI_INIT; +static expert_field ei_gfp_exi_short = EI_INIT; +static expert_field ei_gfp_pfi_short = EI_INIT; +static expert_field ei_gfp_payload_undecoded = EI_INIT; +static expert_field ei_gfp_fcs_bad = EI_INIT; + +#define GFP_USER_DATA 0 +#define GFP_CLIENT_MANAGEMENT 4 +#define GFP_MANAGEMENT_COMMUNICATIONS 5 + +#define GFP_EXT_NULL 0 +#define GFP_EXT_LINEAR 1 +#define GFP_EXT_RING 2 + +/* Initialize the subtree pointers */ +static gint ett_gfp = -1; +static gint ett_gfp_type = -1; +static gint ett_gfp_fcs = -1; + +static dissector_table_t gfp_dissector_table; + +/* ITU-T G.7041 6.1.1, 6.2 */ +static const range_string gfp_pli_rvals[] = { + {0, 0, "Idle Frame"}, + {1, 3, "Control Frame (Reserved)"}, + {4, G_MAXUINT16, "Client Frame"}, + {0, 0, NULL} +}; + +static int * const gfp_type_data_fields[] = { + &hf_gfp_pti, + &hf_gfp_pfi, + &hf_gfp_exi, + &hf_gfp_upi_data, + NULL +}; + +static int * const gfp_type_management_fields[] = { + &hf_gfp_pti, + &hf_gfp_pfi, + &hf_gfp_exi, + &hf_gfp_upi_management, + NULL +}; + +static const value_string gfp_pti_vals[] = { + {GFP_USER_DATA, "User Data"}, + {GFP_CLIENT_MANAGEMENT, "Client Management"}, + {GFP_MANAGEMENT_COMMUNICATIONS, "Management Communications"}, + {0, NULL} +}; + +static const value_string gfp_exi_vals[] = { + {GFP_EXT_NULL, "Null Extension Header"}, + {GFP_EXT_LINEAR, "Linear Frame"}, + {GFP_EXT_RING, "Ring Frame"}, + {0, NULL} +}; + +static const range_string gfp_upi_data_rvals[] = { + {0, 0, "Reserved and not available"}, + {1, 1, "Frame-Mapped Ethernet"}, + {2, 2, "Frame-Mapped PPP"}, + {3, 3, "Transparent Fibre Channel"}, + {4, 4, "Transparent FICON"}, + {5, 5, "Transparent ESCON"}, + {6, 6, "Transparent Gbit Ethernet"}, + {7, 7, "Reserved"}, + {8, 8, "Frame-Mapped Multiple Access Protocol over SDH (MAPOS)"}, + {9, 9, "Transparent DVB ASI"}, + {10, 10, "Frame-Mapped IEEE 802.17 Resilient Packet Ring"}, + {11, 11, "Frame-Mapped Fibre Channel FC-BBW"}, + {12, 12, "Asynchronous Transparent Fibre Channel"}, + {13, 13, "Frame-Mapped MPLS"}, + {14, 14, "Frame-Mapped MPLS (Multicast) [Deprecated]"}, + {15, 15, "Frame-Mapped OSI network layer protocols (IS-IS, ES-IS, CLNP)"}, + {16, 16, "Frame-Mapped IPv4"}, + {17, 17, "Frame-Mapped IPv6"}, + {18, 18, "Frame-Mapped DVB-ASI"}, + {19, 19, "Frame-Mapped 64B/66B encoded Ethernet, including frame preamble"}, + {20, 20, "Frame-Mapped 64B/66B encoded Ethernet ordered set information"}, + {21, 21, "Transparent transcoded FC-1200"}, + /*UPI value 22 & 23 from Amendment 3 (01/2015)*/ + {22, 22, "Precision Time Protocol message"}, + {23, 23, "Synchronization status message"}, + {24, 239, "Reserved for future standardization"}, + {240, 252, "Reserved for proprietary use"}, + {253, 253, "Reserved for proprietary use, formerly Frame-Mapped 64B/66B encoded Ethernet, including frame preamble"}, + {254, 254, "Reserved for proprietary use, formerly Frame-Mapped 64B/66B encoded Ethernet ordered set information"}, + {255, 255, "Reserved and not available"}, + {0, 0, NULL } +}; + +static const range_string gfp_upi_management_rvals[] = { + {0, 0, "Reserved and not available"}, + {1, 1, "Client Signal Fail (Loss of Client Signal)"}, + {2, 2, "Client Signal Fail (Loss of Character Synchronisation)"}, + {3, 3, "Defect Clear Indication (DCI)"}, + {4, 4, "Forward Defect Indication (FDI)"}, + {5, 5, "Reverse Defect Indication (RDI)"}, + {6, 223, "Reserved for future use"}, + {224, 254, "Reserved for proprietary use"}, + {255, 255, "Reserved and not available"}, + {0, 0, NULL} +}; + + +/* Even GFP idle frames must have 4 bytes for the core header. + * If data is received with fewer than this it is rejected. */ +#define GFP_MIN_LENGTH 4 + +static void gfp_prompt(packet_info *pinfo, gchar* result) +{ + snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "UPI %u as", + GPOINTER_TO_UINT(p_get_proto_data(pinfo->pool, pinfo, proto_gfp, 0))); +} + +static gpointer gfp_value(packet_info *pinfo) +{ + return p_get_proto_data(pinfo->pool, pinfo, proto_gfp, 0); +} + +/* GFP has several identical 16 bit CRCs in its header (HECs). Note that + * this function increases the offset. */ +static void +gfp_add_hec_tree(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint *offset, const guint len, const int field, const int field_status, expert_field *ei_bad) +{ + + guint hec_calc; + + hec_calc = crc16_r3_ccitt_tvb(tvb, *offset, len); + *offset += len; + + proto_tree_add_checksum(tree, tvb, *offset, field, field_status, ei_bad, pinfo, hec_calc, ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY); + *offset += 2; +} + +/* G.7041 6.1.2 GFP payload area */ +static void +dissect_gfp_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_tree *gfp_tree, guint *offset, guint payload_len) +{ + tvbuff_t *payload_tvb; + proto_item *type_ti = NULL; + proto_item *fcs_ti; + proto_tree *fcs_tree = NULL; + guint pti, pfi, exi, upi; + guint fcs, fcs_calc; + guint fcs_len = 0; + + /* G.7041 6.1.2.3 Payload area scrambling + * Note that payload when sent on the wire is scrambled as per ATM + * with a 1 + x^43 multiplicative scrambler. Likely already removed by + * the time we get a capture file (as with ATM). Could have a pref, + * but if it's present we have to save state over subsequent frames, + * always would fail to decode the first 43 payload bytes of a capture. */ + + /* G.7041 6.1.2.1 Payload Header - at least 4 bytes */ + tvb_ensure_bytes_exist(tvb, *offset, 4); + payload_len -= 4; + + /* G.7041 6.1.2.1.1 GFP type field - mandatory 2 bytes */ + pti = tvb_get_bits8(tvb, 8*(*offset), 3); + pfi = tvb_get_bits8(tvb, 8*(*offset)+3, 1); + exi = tvb_get_bits8(tvb, 8*(*offset)+4, 4); + upi = tvb_get_guint8(tvb, *offset+1); + p_add_proto_data(pinfo->pool, pinfo, proto_gfp, 0, GUINT_TO_POINTER(upi)); + + col_add_str(pinfo->cinfo, COL_INFO, val_to_str(pti, gfp_pti_vals, "Reserved PTI (%d)")); + if (pti == GFP_USER_DATA || + pti == GFP_MANAGEMENT_COMMUNICATIONS) { + /* G.7041 Table 6-3 - GFP_MANAGEMENT_COMMUNICATIONS + * uses the same UPI table as USER_DATA, though + * "not all of these UPI types are applicable" in that case. */ + type_ti = proto_tree_add_bitmask_with_flags(gfp_tree, tvb, *offset, hf_gfp_type, + ett_gfp_type, gfp_type_data_fields, ENC_BIG_ENDIAN, BMT_NO_FLAGS); + col_append_sep_str(pinfo->cinfo, COL_INFO, ": ", rval_to_str(upi, gfp_upi_data_rvals, "Unknown 0x%02x")); + } else if (pti == GFP_CLIENT_MANAGEMENT) { + /* G.7041 Table 6-4 */ + type_ti = proto_tree_add_bitmask_with_flags(gfp_tree, tvb, *offset, hf_gfp_type, + ett_gfp_type, gfp_type_management_fields, ENC_BIG_ENDIAN, BMT_NO_FLAGS); + col_append_sep_str(pinfo->cinfo, COL_INFO, ": ", rval_to_str(upi, gfp_upi_management_rvals, "Unknown 0x%02x")); + } + + /* G.7041 6.1.2.1.2 Type HEC (tHEC) - mandatory 2 bytes */ + gfp_add_hec_tree(tvb, pinfo, gfp_tree, offset, 2, hf_gfp_thec, hf_gfp_thec_status, &ei_gfp_thec_bad); + + switch (exi) { + case GFP_EXT_NULL: + /* G.7041 6.1.2.1.3.1 Null extension header */ + break; + + case GFP_EXT_LINEAR: + /* G.7041 6.1.2.1.3.2 Extension header for a linear frame */ + if (payload_len < 4) { + expert_add_info(pinfo, type_ti, &ei_gfp_exi_short); + payload_len = 0; + } + else { + payload_len -= 4; + } + proto_tree_add_item(gfp_tree, hf_gfp_cid, tvb, *offset, 1, ENC_BIG_ENDIAN); + /* Next byte spare field, reserved */ + + /* 6.1.2.1.4 Extension HEC field */ + gfp_add_hec_tree(tvb, pinfo, gfp_tree, offset, 2, hf_gfp_ehec, hf_gfp_ehec_status, &ei_gfp_ehec_bad); + break; + case GFP_EXT_RING: + /* 6.1.2.1.3.3 Extension header for a ring frame */ + /* "For further study." Undefined so fall through */ + default: + /* Reserved */ + /* TODO: Mark as error / unhandled? */ + break; + } + + proto_item_set_end(gfp_tree, tvb, *offset); + + if (pfi == 1) { /* 6.1.2.2.1 Payload FCS field present */ + if (payload_len < 4) { + expert_add_info(pinfo, type_ti, &ei_gfp_pfi_short); + fcs_len = payload_len; + payload_len = 0; + } else { + fcs_len = 4; + payload_len -= 4; + } + + proto_tree_set_appendix(gfp_tree, tvb, *offset + payload_len, fcs_len); + fcs = tvb_get_ntohl(tvb, *offset + payload_len); + /* Same CRC32 as ATM */ + /* As with ATM, we can either compute the CRC as it would be + * calculated and compare (last step involves taking the complement), + * or we can include the passed CRC in the input and check to see + * if the remainder is a known value. I like the first method + * only because it lets us display what we should have received. */ + /* Method 1: */ + fcs_calc = crc32_mpeg2_tvb_offset(tvb, *offset, payload_len); + if (fcs == ~fcs_calc) { + fcs_ti = proto_tree_add_uint_format_value(gfp_tree, hf_gfp_fcs, tvb, *offset+payload_len, 4, fcs, "0x%08x [correct]", fcs); + fcs_tree = proto_item_add_subtree(fcs_ti, ett_gfp_fcs); + fcs_ti = proto_tree_add_boolean(fcs_tree, hf_gfp_fcs_good, tvb, *offset+payload_len, 4, TRUE); + proto_item_set_generated(fcs_ti); + fcs_ti = proto_tree_add_boolean(fcs_tree, hf_gfp_fcs_bad, tvb, *offset+payload_len, 4, FALSE); + proto_item_set_generated(fcs_ti); + } else { + fcs_ti = proto_tree_add_uint_format_value(gfp_tree, hf_gfp_fcs, tvb, *offset+payload_len, 4, fcs, "0x%08x [incorrect, should be 0x%08x]", fcs, fcs_calc); + fcs_tree = proto_item_add_subtree(fcs_ti, ett_gfp_fcs); + fcs_ti = proto_tree_add_boolean(fcs_tree, hf_gfp_fcs_good, tvb, *offset+payload_len, 4, FALSE); + proto_item_set_generated(fcs_ti); + fcs_ti = proto_tree_add_boolean(fcs_tree, hf_gfp_fcs_bad, tvb, *offset+payload_len, 4, TRUE); + proto_item_set_generated(fcs_ti); + expert_add_info(pinfo, fcs_ti, &ei_gfp_fcs_bad); + } + /* Method 2: */ + /* fcs_calc = crc32_mpeg2_tvb_offset(tvb, *offset, payload_len+4); + fcs_ti = proto_tree_add_uint(gfp_tree, hf_gfp_fcs, tvb, *offset+payload_len, 4, fcs); + proto_item_append_text(fcs_ti, (fcs_calc == 0xC704DD7B) ? " [correct]" : " [incorrect]"); */ + } + + /* Some client frames we can do. Others are not implemented yet. + * Transparent mode types are much trickier than frame-mapped, + * since they requires reassembling streams across multiple GFP packets. */ + payload_tvb = tvb_new_subset_length(tvb, *offset, payload_len); + switch (pti) { + case GFP_USER_DATA: + case GFP_MANAGEMENT_COMMUNICATIONS: + if (!dissector_try_uint(gfp_dissector_table, upi, payload_tvb, pinfo, tree)) { + expert_add_info_format(pinfo, type_ti, &ei_gfp_payload_undecoded, "Payload type 0x%02x (%s) unsupported", upi, rval_to_str_const(upi, gfp_upi_data_rvals, "UNKNOWN")); + call_data_dissector(payload_tvb, pinfo, tree); + } + break; + + case GFP_CLIENT_MANAGEMENT: + call_data_dissector(payload_tvb, pinfo, tree); + break; + + default: + break; + } + *offset += payload_len; + *offset += fcs_len; +} + +static int +dissect_gfp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, + void *data _U_) +{ + proto_item *ti, *pli_ti; + proto_tree *gfp_tree; + guint offset = 0; + int len = 0; + guint pli; + + /*** HEURISTICS ***/ + + /* Check that the packet is long enough for it to belong to us. */ + if (tvb_reported_length(tvb) < GFP_MIN_LENGTH) + return 0; + + /*** COLUMN DATA ***/ + + /* Set the Protocol column to the constant string of GFP */ + col_set_str(pinfo->cinfo, COL_PROTOCOL, "GFP"); + + col_clear(pinfo->cinfo, COL_INFO); + /* Avoid asserts for leaving these blank. */ + col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A"); + col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A"); + + /*** PROTOCOL TREE ***/ + + /* create display subtree for the protocol */ + ti = proto_tree_add_item(tree, proto_gfp, tvb, 0, GFP_MIN_LENGTH, ENC_NA); + + gfp_tree = proto_item_add_subtree(ti, ett_gfp); + + /* ITU-T G.7041 6.1.1 GFP core header */ + /* The core header could be scrambled (see G.7041 6.1.1.3) but isn't on + * the GFP level capture files I've seen as it's removed before then. + * If using this as a subdissector to a SDH or OTN dissector, that could + * be an issue. TODO: Maybe add a pref for scrambling? */ + len = 2; + pli_ti = proto_tree_add_item_ret_uint(gfp_tree, hf_gfp_pli, tvb, + offset, len, ENC_BIG_ENDIAN, &pli); + if (pli < 4) { /* Don't interpret as payload length */ + proto_item_append_text(pli_ti, " (%s)", rval_to_str_const(pli, gfp_pli_rvals, "Unknown")); + } + col_set_str(pinfo->cinfo, COL_INFO, rval_to_str_const(pli, gfp_pli_rvals, "Unknown")); + + /* 6.1.1.2 Core HEC field */ + gfp_add_hec_tree(tvb, pinfo, gfp_tree, &offset, len, hf_gfp_chec, hf_gfp_chec_status, &ei_gfp_chec_bad); + + if (pli == 0) { /* 6.2.1 GFP idle frames */ + if (tvb_reported_length_remaining(tvb, offset)) { + expert_add_info(pinfo, pli_ti, &ei_gfp_pli_idle_nonempty); + } + } else if (pli < 4) { /* 6.2.2 Other control frames (reserved) */ + expert_add_info(pinfo, pli_ti, &ei_gfp_pli_unknown); + } else { + /* G.7041 6.1.2 GFP payload area */ + if (tvb_reported_length(tvb) < pli + offset) { + /* avoid signed / unsigned comparison */ + proto_item_append_text(pli_ti, " (invalid, reported length is %u)", tvb_reported_length_remaining(tvb, offset)); + expert_add_info(pinfo, pli_ti, &ei_gfp_pli_invalid); + } + dissect_gfp_payload(tvb, pinfo, tree, gfp_tree, &offset, pli); + } + + /* Return the amount of data this dissector was able to dissect */ + return offset; +} + +void +proto_register_gfp(void) +{ + /* Setup list of header fields See Section 1.5 of README.dissector for + * details. */ + static hf_register_info hf[] = { + { &hf_gfp_pli, + { "Payload Length Indicator", "gfp.pli", FT_UINT16, BASE_DEC, + NULL, 0x0, NULL, HFILL } + }, + { &hf_gfp_chec, + { "Core HEC", "gfp.chec", FT_UINT16, BASE_HEX, + NULL, 0x0, NULL, HFILL } + }, + { &hf_gfp_chec_status, + { "cHEC Status", "gfp.chec.status", FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0, + NULL, HFILL } + }, + { &hf_gfp_type, + { "Type Field", "gfp.type", FT_UINT16, BASE_HEX, NULL, 0x0, + NULL, HFILL } + }, + { &hf_gfp_pti, + { "PTI", "gfp.pti", FT_UINT16, BASE_HEX, VALS(gfp_pti_vals), + 0xE000, "Payload Type Identifier", HFILL } + }, + { &hf_gfp_pfi, + { "PFI", "gfp.pfi", FT_BOOLEAN, 16, TFS(&tfs_present_absent), + 0x1000, "Payload FCS Indicator", HFILL } + }, + { &hf_gfp_exi, + { "EXI", "gfp.exi", FT_UINT16, BASE_HEX, VALS(gfp_exi_vals), + 0x0F00, "Extension Header Identifier", HFILL } + }, + { &hf_gfp_upi_data, + { "UPI", "gfp.upi", FT_UINT16, BASE_HEX|BASE_RANGE_STRING, + RVALS(gfp_upi_data_rvals), + 0xFF, "User Payload Identifier for Client Data Frame (or Management Communications Frame)", HFILL } + }, + { &hf_gfp_upi_management, + { "UPI", "gfp.upi", FT_UINT16, BASE_HEX|BASE_RANGE_STRING, + RVALS(gfp_upi_management_rvals), + 0xFF, "User Payload Identifier for Client Management Frame", HFILL } + }, + { &hf_gfp_thec, + { "Type HEC", "gfp.thec", FT_UINT16, BASE_HEX, NULL, 0x0, + NULL, HFILL } + }, + { &hf_gfp_thec_status, + { "tHEC Status", "gfp.thec.status", FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0, + NULL, HFILL } + }, + { &hf_gfp_cid, + { "Channel ID", "gfp.cid", FT_UINT8, BASE_HEX, NULL, 0x0, + NULL, HFILL } + }, + { &hf_gfp_ehec, + { "Extension HEC", "gfp.ehec", FT_UINT16, BASE_HEX, NULL, 0x0, + NULL, HFILL } + }, + { &hf_gfp_ehec_status, + { "eHEC Status", "gfp.ehec.status", FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0, + NULL, HFILL } + }, + { &hf_gfp_fcs, + { "Payload FCS", "gfp.fcs", FT_UINT32, BASE_HEX, NULL, 0x0, + NULL, HFILL } + }, + { &hf_gfp_fcs_good, + { "Good FCS", "gfp.fcs_good", FT_BOOLEAN, BASE_NONE, NULL, 0x0, + "True: FCS matches payload; False: doesn't match", HFILL } + }, + { &hf_gfp_fcs_bad, + { "Bad eHEC", "gfp.fcs_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0, + "True: FCS doesn't match payload; False: matches", HFILL } + } + }; + + /* Setup protocol subtree array */ + static gint *ett[] = { + &ett_gfp, + &ett_gfp_type, + &ett_gfp_fcs + }; + + /* Setup protocol expert items */ + static ei_register_info ei[] = { + { &ei_gfp_pli_idle_nonempty, + { "gfp.pli.idle.nonempty", PI_MALFORMED, PI_ERROR, + "Payload present on idle frame", EXPFILL } + }, + { &ei_gfp_pli_unknown, + { "gfp.pli.unknown", PI_UNDECODED, PI_WARN, + "Unknown control frame type", EXPFILL } + }, + { &ei_gfp_pli_invalid, + { "gfp.pli.invalid", PI_MALFORMED, PI_WARN, + "Bogus PLI does not match reported length", EXPFILL } + }, + { &ei_gfp_chec_bad, + { "gfp.chec.bad", PI_CHECKSUM, PI_WARN, + "Bad cHEC", EXPFILL } + }, + { &ei_gfp_thec_bad, + { "gfp.thec.bad", PI_CHECKSUM, PI_WARN, + "Bad tHEC", EXPFILL } + }, + { &ei_gfp_ehec_bad, + { "gfp.ehec.bad", PI_CHECKSUM, PI_WARN, + "Bad eHEC", EXPFILL } + }, + { &ei_gfp_exi_short, + { "gfp.exi.missing", PI_MALFORMED, PI_ERROR, + "EXI bit set but PLI too short for extension header", EXPFILL} + }, + { &ei_gfp_pfi_short, + { "gfp.pfi.missing", PI_MALFORMED, PI_ERROR, + "PFI bit set but PLI too short for payload FCS", EXPFILL} + }, + { &ei_gfp_payload_undecoded, + { "gfp.payload.undecoded", PI_UNDECODED, PI_WARN, + "Payload type not supported yet by the dissector", EXPFILL} + }, + { &ei_gfp_fcs_bad, + { "gfp.fcs.bad", PI_CHECKSUM, PI_WARN, + "Bad FCS", EXPFILL } + } + }; + + /* Decode As handling */ + static build_valid_func gfp_da_build_value[1] = {gfp_value}; + static decode_as_value_t gfp_da_values = {gfp_prompt, 1, gfp_da_build_value}; + static decode_as_t gfp_da = {"gfp", "gfp.upi", 1, 0, &gfp_da_values, NULL, NULL, + decode_as_default_populate_list, decode_as_default_reset, decode_as_default_change, NULL}; + + /* module_t *gfp_module; */ + expert_module_t *expert_gfp; + + /* Register the protocol name and description */ + proto_gfp = proto_register_protocol("Generic Framing Procedure", + "GFP", "gfp"); + gfp_handle = register_dissector("gfp", dissect_gfp, + proto_gfp); + + /* Required function calls to register the header fields and subtrees */ + proto_register_field_array(proto_gfp, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + /* Required function calls to register expert items */ + expert_gfp = expert_register_protocol(proto_gfp); + expert_register_field_array(expert_gfp, ei, array_length(ei)); + + /* Subdissectors for payload */ + gfp_dissector_table = register_dissector_table("gfp.upi", "GFP UPI (for Client Data frames)", + proto_gfp, FT_UINT8, BASE_DEC); + + /* Don't register a preferences module yet since there are no prefs in + * order to avoid a warning. (See section 2.6 of README.dissector + * for more details on preferences). */ + /*gfp_module = prefs_register_protocol(proto_gfp, NULL);*/ + + register_decode_as(&gfp_da); +} + +void +proto_reg_handoff_gfp(void) +{ + dissector_add_uint("wtap_encap", WTAP_ENCAP_GFP_T, gfp_handle); + dissector_add_uint("wtap_encap", WTAP_ENCAP_GFP_F, gfp_handle); + + /* Add a few of the easiest UPIs to decode. There's more that probably + * would work, but are untested (frame mapped DVB, frame mapped Fibre + * Channel). The transparent mode ones are trickier, since without a + * one-to-one mapping of frames, we would have to reassemble payload + * packets across multiple GFP packets. + * + * Section 7.1.1 "Ethernet MAC encapsulation" of G.7041 says + * "The Ethernet MAC octets from destination address through + * "frame check sequence, inclusive, are placed in the GFP payload + * "information field.", so we want the dissector for Ethernet + * frames including the FCS. */ + dissector_add_uint("gfp.upi", 1, find_dissector("eth_withfcs")); + dissector_add_uint("gfp.upi", 2, find_dissector("ppp_hdlc")); + dissector_add_uint("gfp.upi", 9, find_dissector("mp2t")); + dissector_add_uint("gfp.upi", 12, find_dissector("mpls")); + dissector_add_uint("gfp.upi", 13, find_dissector("mpls")); + dissector_add_uint("gfp.upi", 16, find_dissector("ip")); + dissector_add_uint("gfp.upi", 17, find_dissector("ipv6")); +} + +/* + * 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: + */ |