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Diffstat (limited to 'epan/dissectors/packet-v5ef.c')
| -rw-r--r-- | epan/dissectors/packet-v5ef.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/epan/dissectors/packet-v5ef.c b/epan/dissectors/packet-v5ef.c new file mode 100644 index 00000000..89afcd1a --- /dev/null +++ b/epan/dissectors/packet-v5ef.c @@ -0,0 +1,199 @@ +/* packet-v5ef.c + * Routines for V5 envelope function frame disassembly + * Rolf Fiedler <rolf.fiedler@innoventif.de> + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +/* + * V5 bitstream over HDLC handling + * + * V5 references: + * + * ETS 300 324-1 + * ETS 300 347-1 + */ + +#include "config.h" + +#include <epan/packet.h> +#include <wiretap/wtap.h> + +void proto_register_v5ef(void); +void proto_reg_handoff_v5ef(void); + +static int proto_v5ef = -1; +static int hf_v5ef_direction = -1; +static int hf_v5ef_address = -1; +static int hf_v5ef_eah = -1; +static int hf_v5ef_ea1 = -1; +static int hf_v5ef_eal = -1; +static int hf_v5ef_ea2 = -1; + +static gint ett_v5ef = -1; +static gint ett_v5ef_address = -1; + +static dissector_handle_t v5dl_handle, lapd_phdr_handle, v5ef_handle; + + +/* + * Bits in the address field. + */ +#define V5EF_EAH 0xfc00 /* Service Access Point Identifier */ +#define V5EF_EAH_SHIFT 10 +#define V5EF_EA1 0x0100 /* First Address Extension bit */ +#define V5EF_EAL 0x00fe /* Terminal Endpoint Identifier */ +#define V5EF_EAL_SHIFT 1 +#define V5EF_EA2 0x0001 /* Second Address Extension bit */ + +static const value_string v5ef_direction_vals[] = { + { 0, "AN->LE"}, + { 1, "LE->AN"}, + { 0, NULL } +}; + +#define MAX_V5EF_PACKET_LEN 1024 + +static int +dissect_v5ef(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data) +{ + struct isdn_phdr *isdn = (struct isdn_phdr *)data; + proto_tree *v5ef_tree, *addr_tree; + proto_item *v5ef_ti, *addr_ti; + int direction; + int v5ef_header_len; + guint16 addr, eah, eal, efaddr; + tvbuff_t *next_tvb; + const char *srcname = "src"; + const char *dstname = "dst"; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "V5-EF"); + col_clear(pinfo->cinfo, COL_INFO); + + addr = tvb_get_ntohs(tvb, 0); + eah = (addr & V5EF_EAH) >> V5EF_EAH_SHIFT; + eal = (addr & V5EF_EAL) >> V5EF_EAL_SHIFT; + efaddr = (eah << 7) + eal; + v5ef_header_len = 2; /* addr */ + + direction = isdn->uton; + if (direction==0) { + srcname = "LE"; + dstname = "AN"; + } else if (direction > 0) { + srcname = "AN"; + dstname = "LE"; + } + col_set_str(pinfo->cinfo, COL_RES_DL_SRC, srcname); + col_set_str(pinfo->cinfo, COL_RES_DL_DST, dstname); + + if (tree) { + proto_item *direction_ti; + + v5ef_ti = proto_tree_add_item(tree, proto_v5ef, tvb, 0, -1, + ENC_NA); + v5ef_tree = proto_item_add_subtree(v5ef_ti, ett_v5ef); + + /* + * Don't show the direction if we don't know it. + */ + if (direction != P2P_DIR_UNKNOWN) { + direction_ti = proto_tree_add_uint(v5ef_tree, hf_v5ef_direction, + tvb, 0, 0, direction); + proto_item_set_generated(direction_ti); + } + + addr_ti = proto_tree_add_uint(v5ef_tree, hf_v5ef_address, tvb, + 0, 2, addr); + addr_tree = proto_item_add_subtree(addr_ti, ett_v5ef_address); + + proto_tree_add_uint(addr_tree, hf_v5ef_eah, tvb, 0, 1, addr); + proto_tree_add_uint(addr_tree, hf_v5ef_ea1, tvb, 0, 1, addr); + proto_tree_add_uint(addr_tree, hf_v5ef_eal, tvb, 1, 1, addr); + proto_tree_add_uint(addr_tree, hf_v5ef_ea2, tvb, 1, 1, addr); + } + else { + v5ef_ti = NULL; + v5ef_tree = NULL; + } + + if (tree) + proto_item_set_len(v5ef_ti, v5ef_header_len); + + next_tvb = tvb_new_subset_remaining(tvb, v5ef_header_len); + + if (efaddr>8175) + call_dissector(v5dl_handle,next_tvb, pinfo, tree); + else + call_dissector_with_data(lapd_phdr_handle, next_tvb, pinfo, tree, isdn); + + return tvb_captured_length(tvb); +} + +void +proto_register_v5ef(void) +{ + static hf_register_info hf[] = { + + { &hf_v5ef_direction, + { "Direction", "v5ef.direction", FT_UINT8, BASE_DEC, VALS(v5ef_direction_vals), 0x0, + NULL, HFILL }}, + + { &hf_v5ef_address, + { "Address Field", "v5ef.address", FT_UINT16, BASE_HEX, NULL, 0x0, + "Address", HFILL }}, + + { &hf_v5ef_eah, + { "EAH", "v5ef.eah", FT_UINT16, BASE_DEC, NULL, V5EF_EAH, + "Envelope Address High Part", HFILL }}, + + { &hf_v5ef_ea1, + { "EA1", "v5ef.ea1", FT_UINT16, BASE_DEC, NULL, V5EF_EA1, + "First Address Extension bit", HFILL }}, + + { &hf_v5ef_eal, + { "EAL", "v5ef.eal", FT_UINT16, BASE_DEC, NULL, V5EF_EAL, + "Envelope Address Low Part", HFILL }}, + + { &hf_v5ef_ea2, + { "EA2", "v5ef.ea2", FT_UINT16, BASE_DEC, NULL, V5EF_EA2, + "Second Address Extension bit", HFILL }}, + }; + + static gint *ett[] = { + &ett_v5ef, + &ett_v5ef_address, + }; + + proto_v5ef = proto_register_protocol("V5 Envelope Function (v5ef)", + "v5ef", "v5ef"); + proto_register_field_array (proto_v5ef, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + v5ef_handle = register_dissector("v5ef", dissect_v5ef, proto_v5ef); +} + +void +proto_reg_handoff_v5ef(void) +{ + dissector_add_uint("wtap_encap", WTAP_ENCAP_V5_EF, v5ef_handle); + + lapd_phdr_handle = find_dissector_add_dependency("lapd-phdr", proto_v5ef); + v5dl_handle = find_dissector_add_dependency("v5dl", proto_v5ef); +} + +/* + * Editor modelines - https://www.wireshark.org/tools/modelines.html + * + * Local variables: + * c-basic-offset: 8 + * tab-width: 8 + * indent-tabs-mode: t + * End: + * + * vi: set shiftwidth=8 tabstop=8 noexpandtab: + * :indentSize=8:tabSize=8:noTabs=false: + */ |