/* packet-gsmtap.c * Routines for GSMTAP captures * * (C) 2008-2012 by Harald Welte * (C) 2011 by Holger Hans Peter Freyther * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. * */ /* GSMTAP is a generic header format for GSM protocol captures, * it uses the IANA-assigned UDP port number 4729 and carries * payload in various formats of GSM interfaces such as Um MAC * blocks or Um bursts. * * Example programs generating GSMTAP data are airprobe * (http://airprobe.org/) or OsmocomBB (http://bb.osmocom.org/) * * It has also been used for Tetra by the OsmocomTETRA project. * (http://tetra.osmocom.org/) * * GSMTAP also carries payload in various formats of WiMAX interfaces. * It uses the wimax plugin to decode the WiMAX bursts. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include "packet-tetra.h" /* ====== DO NOT MAKE UNAPPROVED MODIFICATIONS HERE ===== */ /* The following types and definitions are imported from libosmocore, * the original source of the GSMTAP format. * * prior to getting them accepted/included into the official Osmocom * GSMTAP definition, available from * http://cgit.osmocom.org/cgit/libosmocore/tree/include/osmocom/core/gsmtap.h * * The GSMTAP maintainer can be contacted via the * openbsc@lists.osmocom.org mailing list, or by private e-mail * to laforge@gnumonks.org */ /* ====== DO NOT MAKE UNAPPROVED MODIFICATIONS HERE ===== */ #define GSMTAP_TYPE_UM 0x01 #define GSMTAP_TYPE_ABIS 0x02 #define GSMTAP_TYPE_UM_BURST 0x03 /* raw burst bits */ #define GSMTAP_TYPE_SIM 0x04 #define GSMTAP_TYPE_TETRA_I1 0x05 /* tetra air interface */ #define GSMTAP_TTPE_TETRA_I1_BURST 0x06 /* tetra air interface */ #define GSMTAP_TYPE_WMX_BURST 0x07 /* WiMAX burst */ #define GSMTAP_TYPE_GB_LLC 0x08 /* GPRS Gb interface: LLC */ #define GSMTAP_TYPE_GB_SNDCP 0x09 /* GPRS Gb interface: SNDCP */ #define GSMTAP_TYPE_GMR1_UM 0x0a /* GMR-1 L2 packets */ /* ====== DO NOT MAKE UNAPPROVED MODIFICATIONS HERE ===== */ #define GSMTAP_BURST_UNKNOWN 0x00 #define GSMTAP_BURST_FCCH 0x01 #define GSMTAP_BURST_PARTIAL_SCH 0x02 #define GSMTAP_BURST_SCH 0x03 #define GSMTAP_BURST_CTS_SCH 0x04 #define GSMTAP_BURST_COMPACT_SCH 0x05 #define GSMTAP_BURST_NORMAL 0x06 #define GSMTAP_BURST_DUMMY 0x07 #define GSMTAP_BURST_ACCESS 0x08 #define GSMTAP_BURST_NONE 0x09 /* WiMAX bursts */ #define GSMTAP_BURST_CDMA_CODE 0x10 /* WiMAX CDMA Code Attribute burst */ #define GSMTAP_BURST_FCH 0x11 /* WiMAX FCH burst */ #define GSMTAP_BURST_FFB 0x12 /* WiMAX Fast Feedback burst */ #define GSMTAP_BURST_PDU 0x13 /* WiMAX PDU burst */ #define GSMTAP_BURST_HACK 0x14 /* WiMAX HARQ ACK burst */ #define GSMTAP_BURST_PHY_ATTRIBUTES 0x15 /* WiMAX PHY Attributes burst */ /* ====== DO NOT MAKE UNAPPROVED MODIFICATIONS HERE ===== */ /* sub-types for TYPE_UM */ #define GSMTAP_CHANNEL_UNKNOWN 0x00 #define GSMTAP_CHANNEL_BCCH 0x01 #define GSMTAP_CHANNEL_CCCH 0x02 #define GSMTAP_CHANNEL_RACH 0x03 #define GSMTAP_CHANNEL_AGCH 0x04 #define GSMTAP_CHANNEL_PCH 0x05 #define GSMTAP_CHANNEL_SDCCH 0x06 #define GSMTAP_CHANNEL_SDCCH4 0x07 #define GSMTAP_CHANNEL_SDCCH8 0x08 #define GSMTAP_CHANNEL_TCH_F 0x09 #define GSMTAP_CHANNEL_TCH_H 0x0a #define GSMTAP_CHANNEL_PACCH 0x0b #define GSMTAP_CHANNEL_CBCH52 0x0c #define GSMTAP_CHANNEL_PDCH 0x0d #define GSMTAP_CHANNEL_PTCCH 0x0e #define GSMTAP_CHANNEL_CBCH51 0x0f /* GPRS Coding Scheme CS1..4 */ #define GSMTAP_GPRS_CS_BASE 0x20 #define GSMTAP_GPRS_CS(N) (GSMTAP_GPRS_CS_BASE + N) /* (E) GPRS Coding Scheme MCS0..9 */ #define GSMTAP_GPRS_MCS_BASE 0x30 #define GSMTAP_GPRS_MCS(N) (GSMTAP_GPRS_MCS_BASE + N) #define GSMTAP_CHANNEL_ACCH 0x80 /* ====== DO NOT MAKE UNAPPROVED MODIFICATIONS HERE ===== */ /* sub-types for TYPE_TETRA_AIR */ #define GSMTAP_TETRA_BSCH 0x01 #define GSMTAP_TETRA_AACH 0x02 #define GSMTAP_TETRA_SCH_HU 0x03 #define GSMTAP_TETRA_SCH_HD 0x04 #define GSMTAP_TETRA_SCH_F 0x05 #define GSMTAP_TETRA_BNCH 0x06 #define GSMTAP_TETRA_STCH 0x07 #define GSMTAP_TETRA_TCH_F 0x08 /* ====== DO NOT MAKE UNAPPROVED MODIFICATIONS HERE ===== */ /* sub-types for TYPE_GMR1 */ #define GSMTAP_GMR1_UNKNOWN 0x00 #define GSMTAP_GMR1_BCCH 0x01 #define GSMTAP_GMR1_CCCH 0x02 /* either AGCH or PCH */ #define GSMTAP_GMR1_PCH 0x03 #define GSMTAP_GMR1_AGCH 0x04 #define GSMTAP_GMR1_BACH 0x05 #define GSMTAP_GMR1_RACH 0x06 #define GSMTAP_GMR1_CBCH 0x07 #define GSMTAP_GMR1_SDCCH 0x08 #define GSMTAP_GMR1_TACCH 0x09 #define GSMTAP_GMR1_GBCH 0x0a #define GSMTAP_GMR1_SACCH 0x01 /* to be combined with _TCH{6,9} */ #define GSMTAP_GMR1_FACCH 0x02 /* to be combines with _TCH{3,6,9} */ #define GSMTAP_GMR1_DKAB 0x03 /* to be combined with _TCH3 */ #define GSMTAP_GMR1_TCH3 0x10 #define GSMTAP_GMR1_TCH6 0x14 #define GSMTAP_GMR1_TCH9 0x18 #define GSMTAP_ARFCN_F_PCS 0x8000 #define GSMTAP_ARFCN_F_UPLINK 0x4000 #define GSMTAP_ARFCN_MASK 0x3fff #define GSMTAP_UDP_PORT 4729 /* This is the header as it is used by gsmtap-generating software. * It is not used by the wireshark dissector and provided for reference only. struct gsmtap_hdr { guint8 version; // version, set to 0x01 currently guint8 hdr_len; // length in number of 32bit words guint8 type; // see GSMTAP_TYPE_* guint8 timeslot; // timeslot (0..7 on Um) guint16 arfcn; // ARFCN (frequency) gint8 signal_dbm; // signal level in dBm gint8 snr_db; // signal/noise ratio in dB guint32 frame_number; // GSM Frame Number (FN) guint8 sub_type; // Type of burst/channel, see above guint8 antenna_nr; // Antenna Number guint8 sub_slot; // sub-slot within timeslot guint8 res; // reserved for future use (RFU) } */ static int proto_gsmtap = -1; static int hf_gsmtap_version = -1; static int hf_gsmtap_hdrlen = -1; static int hf_gsmtap_type = -1; static int hf_gsmtap_timeslot = -1; static int hf_gsmtap_subslot = -1; static int hf_gsmtap_arfcn = -1; static int hf_gsmtap_uplink = -1; static int hf_gsmtap_noise_dbm = -1; static int hf_gsmtap_signal_dbm = -1; static int hf_gsmtap_frame_nr = -1; static int hf_gsmtap_burst_type = -1; static int hf_gsmtap_channel_type = -1; static int hf_gsmtap_tetra_channel_type = -1; static int hf_gsmtap_gmr1_channel_type = -1; static int hf_gsmtap_antenna = -1; static int hf_sacch_l1h_power_lev = -1; static int hf_sacch_l1h_fpc = -1; static int hf_sacch_l1h_ta = -1; static gint ett_gsmtap = -1; enum { GSMTAP_SUB_DATA = 0, GSMTAP_SUB_UM, GSMTAP_SUB_UM_LAPDM, GSMTAP_SUB_UM_RLC_MAC_UL, GSMTAP_SUB_UM_RLC_MAC_DL, GSMTAP_SUB_LLC, GSMTAP_SUB_SNDCP, GSMTAP_SUB_ABIS, /* WiMAX sub handles */ GSMTAP_SUB_CDMA_CODE, GSMTAP_SUB_FCH, GSMTAP_SUB_FFB, GSMTAP_SUB_PDU, GSMTAP_SUB_HACK, GSMTAP_SUB_PHY_ATTRIBUTES, GSMTAP_SUB_CBCH, GSMTAP_SUB_SIM, /* GMR-1 sub handles */ GSMTAP_SUB_GMR1_BCCH, GSMTAP_SUB_GMR1_CCCH, GSMTAP_SUB_GMR1_LAPSAT, GSMTAP_SUB_GMR1_RACH, GSMTAP_SUB_MAX }; static dissector_handle_t sub_handles[GSMTAP_SUB_MAX]; static dissector_table_t gsmtap_dissector_table; static const value_string gsmtap_bursts[] = { { GSMTAP_BURST_UNKNOWN, "UNKNOWN" }, { GSMTAP_BURST_FCCH, "FCCH" }, { GSMTAP_BURST_PARTIAL_SCH, "PARTIAL SCH" }, { GSMTAP_BURST_SCH, "SCH" }, { GSMTAP_BURST_CTS_SCH, "CTS SCH" }, { GSMTAP_BURST_COMPACT_SCH, "COMPACT SCH" }, { GSMTAP_BURST_NORMAL, "NORMAL" }, { GSMTAP_BURST_DUMMY, "DUMMY" }, { GSMTAP_BURST_ACCESS, "RACH" }, /* WiMAX bursts */ { GSMTAP_BURST_CDMA_CODE, "CDMA Code" }, { GSMTAP_BURST_FCH, "FCH" }, { GSMTAP_BURST_FFB, "Fast Feedback" }, { GSMTAP_BURST_PDU, "PDU" }, { GSMTAP_BURST_HACK, "HACK" }, { GSMTAP_BURST_PHY_ATTRIBUTES, "PHY Attributes" }, { 0, NULL }, }; static const value_string gsmtap_channels[] = { { GSMTAP_CHANNEL_UNKNOWN, "UNKNOWN" }, { GSMTAP_CHANNEL_BCCH, "BCCH" }, { GSMTAP_CHANNEL_CCCH, "CCCH" }, { GSMTAP_CHANNEL_RACH, "RACH" }, { GSMTAP_CHANNEL_AGCH, "AGCH" }, { GSMTAP_CHANNEL_PCH, "PCH" }, { GSMTAP_CHANNEL_SDCCH, "SDCCH" }, { GSMTAP_CHANNEL_SDCCH4, "SDCCH/4" }, { GSMTAP_CHANNEL_SDCCH8, "SDCCH/8" }, { GSMTAP_CHANNEL_TCH_F, "FACCH/F" }, { GSMTAP_CHANNEL_TCH_H, "FACCH/H" }, { GSMTAP_CHANNEL_PACCH, "PACCH" }, { GSMTAP_CHANNEL_CBCH52, "CBCH" }, { GSMTAP_CHANNEL_PDCH, "PDCH" }, { GSMTAP_CHANNEL_PTCCH, "PTTCH" }, { GSMTAP_CHANNEL_CBCH51, "CBCH" }, { GSMTAP_CHANNEL_ACCH| GSMTAP_CHANNEL_SDCCH, "LSACCH" }, { GSMTAP_CHANNEL_ACCH| GSMTAP_CHANNEL_SDCCH4, "SACCH/4" }, { GSMTAP_CHANNEL_ACCH| GSMTAP_CHANNEL_SDCCH8, "SACCH/8" }, { GSMTAP_CHANNEL_ACCH| GSMTAP_CHANNEL_TCH_F, "SACCH/F" }, { GSMTAP_CHANNEL_ACCH| GSMTAP_CHANNEL_TCH_H, "SACCH/H" }, { 0, NULL }, }; static const value_string gsmtap_tetra_channels[] = { { GSMTAP_TETRA_BSCH, "BSCH" }, { GSMTAP_TETRA_AACH, "AACH" }, { GSMTAP_TETRA_SCH_HU, "SCH/HU" }, { GSMTAP_TETRA_SCH_HD, "SCH/HD" }, { GSMTAP_TETRA_SCH_F, "SCH/F" }, { GSMTAP_TETRA_BNCH, "BNCH" }, { GSMTAP_TETRA_STCH, "STCH" }, { GSMTAP_TETRA_TCH_F, "AACH" }, { 0, NULL }, }; static const value_string gsmtap_gmr1_channels[] = { { GSMTAP_GMR1_BCCH, "BCCH" }, { GSMTAP_GMR1_CCCH, "CCCH" }, { GSMTAP_GMR1_PCH, "PCH" }, { GSMTAP_GMR1_AGCH, "AGCH" }, { GSMTAP_GMR1_BACH, "BACH" }, { GSMTAP_GMR1_RACH, "RACH" }, { GSMTAP_GMR1_CBCH, "CBCH" }, { GSMTAP_GMR1_SDCCH, "SDCCH" }, { GSMTAP_GMR1_TACCH, "TACCH" }, { GSMTAP_GMR1_GBCH, "GBCH" }, { GSMTAP_GMR1_TCH3, "TCH3" }, { GSMTAP_GMR1_TCH3| GSMTAP_GMR1_FACCH, "FACCH3" }, { GSMTAP_GMR1_TCH3| GSMTAP_GMR1_DKAB, "DKAB" }, { GSMTAP_GMR1_TCH6, "TCH6" }, { GSMTAP_GMR1_TCH6| GSMTAP_GMR1_FACCH, "FACCH6" }, { GSMTAP_GMR1_TCH6| GSMTAP_GMR1_SACCH, "SACCH6" }, { GSMTAP_GMR1_TCH9, "TCH9" }, { GSMTAP_GMR1_TCH9| GSMTAP_GMR1_FACCH, "FACCH9" }, { GSMTAP_GMR1_TCH9| GSMTAP_GMR1_SACCH, "SACCH9" }, { 0, NULL }, }; /* the mapping is not complete */ static const int gsmtap_to_tetra[9] = { 0, TETRA_CHAN_BSCH, TETRA_CHAN_AACH, TETRA_CHAN_SCH_HU, 0, TETRA_CHAN_SCH_F, TETRA_CHAN_BNCH, TETRA_CHAN_STCH, 0 }; static const value_string gsmtap_types[] = { { GSMTAP_TYPE_UM, "GSM Um (MS<->BTS)" }, { GSMTAP_TYPE_ABIS, "GSM Abis (BTS<->BSC)" }, { GSMTAP_TYPE_UM_BURST, "GSM Um burst (MS<->BTS)" }, { GSMTAP_TYPE_SIM, "SIM" }, { GSMTAP_TYPE_TETRA_I1, "TETRA V+D"}, { GSMTAP_TTPE_TETRA_I1_BURST, "TETRA V+D burst"}, { GSMTAP_TYPE_WMX_BURST,"WiMAX burst" }, { GSMTAP_TYPE_GMR1_UM, "GMR-1 air interfeace (MES-MS<->GTS)" }, { 0, NULL }, }; /* dissect a SACCH L1 header which is included in the first 2 bytes * of every SACCH frame (according to TS 04.04) */ static void dissect_sacch_l1h(tvbuff_t *tvb, proto_tree *tree) { proto_item *ti; proto_tree *l1h_tree = NULL; if (!tree) return; ti = proto_tree_add_protocol_format(tree, proto_gsmtap, tvb, 0, 2, "SACCH L1 Header, Power Level: %u, Timing Advance: %u", tvb_get_guint8(tvb, 0) & 0x1f, tvb_get_guint8(tvb, 1)); l1h_tree = proto_item_add_subtree(ti, ett_gsmtap); /* Power Level */ proto_tree_add_item(l1h_tree, hf_sacch_l1h_power_lev, tvb, 0, 1, ENC_BIG_ENDIAN); /* Fast Power Control */ proto_tree_add_item(l1h_tree, hf_sacch_l1h_fpc, tvb, 0, 1, ENC_BIG_ENDIAN); /* Acutal Timing Advance */ proto_tree_add_item(l1h_tree, hf_sacch_l1h_ta, tvb, 1, 1, ENC_BIG_ENDIAN); } static void handle_tetra(int channel _U_, tvbuff_t *payload_tvb _U_, packet_info *pinfo _U_, proto_tree *tree _U_) { int tetra_chan; if (channel < 0 || channel > GSMTAP_TETRA_TCH_F) return; tetra_chan = gsmtap_to_tetra[channel]; if (tetra_chan <= 0) return; tetra_dissect_pdu(tetra_chan, TETRA_DOWNLINK, payload_tvb, tree, pinfo); } /* dissect a GSMTAP header and hand payload off to respective dissector */ static void dissect_gsmtap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { int sub_handle, len, offset = 0; proto_item *ti; proto_tree *gsmtap_tree = NULL; tvbuff_t *payload_tvb, *l1h_tvb = NULL; guint8 hdr_len, type, sub_type, timeslot, subslot; guint16 arfcn; len = tvb_length(tvb); hdr_len = tvb_get_guint8(tvb, offset + 1) <<2; type = tvb_get_guint8(tvb, offset + 2); timeslot = tvb_get_guint8(tvb, offset + 3); arfcn = tvb_get_ntohs(tvb, offset + 4); sub_type = tvb_get_guint8(tvb, offset + 12); subslot = tvb_get_guint8(tvb, offset + 14); /* In case of a SACCH, there is a two-byte L1 header in front * of the packet (see TS 04.04) */ if (type == GSMTAP_TYPE_UM && sub_type & GSMTAP_CHANNEL_ACCH) { l1h_tvb = tvb_new_subset(tvb, hdr_len, 2, 2); payload_tvb = tvb_new_subset(tvb, hdr_len+2, len-(hdr_len+2), len-(hdr_len+2)); } else { payload_tvb = tvb_new_subset(tvb, hdr_len, len-hdr_len, len-hdr_len); } /* We don't want any UDP related info left in the INFO field, as the * gsm_a_dtap dissector will not clear but only append */ col_clear(pinfo->cinfo, COL_INFO); col_set_str(pinfo->cinfo, COL_PROTOCOL, "GSMTAP"); /* Some GSMTAP types are completely unrelated to the Um air interface */ if (dissector_try_uint(gsmtap_dissector_table, type, payload_tvb, pinfo, tree)) return; if (arfcn & GSMTAP_ARFCN_F_UPLINK) { col_append_str(pinfo->cinfo, COL_RES_NET_SRC, "MS"); col_append_str(pinfo->cinfo, COL_RES_NET_DST, "BTS"); /* p2p_dir is used by the LAPDm dissector */ pinfo->p2p_dir = P2P_DIR_SENT; } else { col_set_str(pinfo->cinfo, COL_RES_NET_SRC, "BTS"); switch (sub_type & ~GSMTAP_CHANNEL_ACCH) { case GSMTAP_CHANNEL_BCCH: case GSMTAP_CHANNEL_CCCH: case GSMTAP_CHANNEL_PCH: case GSMTAP_CHANNEL_AGCH: case GSMTAP_CHANNEL_CBCH51: case GSMTAP_CHANNEL_CBCH52: col_set_str(pinfo->cinfo, COL_RES_NET_DST, "Broadcast"); break; default: col_set_str(pinfo->cinfo, COL_RES_NET_DST, "MS"); break; } /* p2p_dir is used by the LAPDm dissector */ pinfo->p2p_dir = P2P_DIR_RECV; } /* Try to build an identifier of different 'streams' */ /* (AFCN _cant_ be used because of hopping */ pinfo->circuit_id = (timeslot << 3) | subslot; if (tree) { guint8 channel; const char *channel_str; channel = tvb_get_guint8(tvb, offset+12); if (type == GSMTAP_TYPE_TETRA_I1) channel_str = val_to_str(channel, gsmtap_tetra_channels, "Unknown: %d"); else if (type == GSMTAP_TYPE_GMR1_UM) channel_str = val_to_str(channel, gsmtap_gmr1_channels, "Unknown: %d"); else channel_str = val_to_str(channel, gsmtap_channels, "Unknown: %d"); ti = proto_tree_add_protocol_format(tree, proto_gsmtap, tvb, 0, hdr_len, "GSM TAP Header, ARFCN: %u (%s), TS: %u, Channel: %s (%u)", arfcn & GSMTAP_ARFCN_MASK, arfcn & GSMTAP_ARFCN_F_UPLINK ? "Uplink" : "Downlink", tvb_get_guint8(tvb, offset+3), channel_str, tvb_get_guint8(tvb, offset+14)); gsmtap_tree = proto_item_add_subtree(ti, ett_gsmtap); proto_tree_add_item(gsmtap_tree, hf_gsmtap_version, tvb, offset, 1, ENC_BIG_ENDIAN); proto_tree_add_uint_format(gsmtap_tree, hf_gsmtap_hdrlen, tvb, offset+1, 1, hdr_len, "Header length: %u bytes", hdr_len); proto_tree_add_item(gsmtap_tree, hf_gsmtap_type, tvb, offset+2, 1, ENC_BIG_ENDIAN); proto_tree_add_item(gsmtap_tree, hf_gsmtap_timeslot, tvb, offset+3, 1, ENC_BIG_ENDIAN); proto_tree_add_item(gsmtap_tree, hf_gsmtap_arfcn, tvb, offset+4, 2, ENC_BIG_ENDIAN); proto_tree_add_item(gsmtap_tree, hf_gsmtap_uplink, tvb, offset+4, 2, ENC_BIG_ENDIAN); proto_tree_add_item(gsmtap_tree, hf_gsmtap_noise_dbm, tvb, offset+6, 1, ENC_BIG_ENDIAN); proto_tree_add_item(gsmtap_tree, hf_gsmtap_signal_dbm, tvb, offset+7, 1, ENC_BIG_ENDIAN); proto_tree_add_item(gsmtap_tree, hf_gsmtap_frame_nr, tvb, offset+8, 4, ENC_BIG_ENDIAN); if (type == GSMTAP_TYPE_UM_BURST) proto_tree_add_item(gsmtap_tree, hf_gsmtap_burst_type, tvb, offset+12, 1, ENC_BIG_ENDIAN); else if (type == GSMTAP_TYPE_UM) proto_tree_add_item(gsmtap_tree, hf_gsmtap_channel_type, tvb, offset+12, 1, ENC_BIG_ENDIAN); else if (type == GSMTAP_TYPE_TETRA_I1) proto_tree_add_item(gsmtap_tree, hf_gsmtap_tetra_channel_type, tvb, offset+12, 1, ENC_BIG_ENDIAN); else if (type == GSMTAP_TYPE_WMX_BURST) proto_tree_add_item(gsmtap_tree, hf_gsmtap_burst_type, tvb, offset+12, 1, ENC_BIG_ENDIAN); else if (type == GSMTAP_TYPE_GMR1_UM) proto_tree_add_item(gsmtap_tree, hf_gsmtap_gmr1_channel_type, tvb, offset+12, 1, ENC_BIG_ENDIAN); proto_tree_add_item(gsmtap_tree, hf_gsmtap_antenna, tvb, offset+13, 1, ENC_BIG_ENDIAN); proto_tree_add_item(gsmtap_tree, hf_gsmtap_subslot, tvb, offset+14, 1, ENC_BIG_ENDIAN); } switch (type) { case GSMTAP_TYPE_UM: if (l1h_tvb) dissect_sacch_l1h(l1h_tvb, tree); switch (sub_type & ~GSMTAP_CHANNEL_ACCH) { case GSMTAP_CHANNEL_BCCH: case GSMTAP_CHANNEL_CCCH: case GSMTAP_CHANNEL_PCH: case GSMTAP_CHANNEL_AGCH: /* FIXME: we might want to skip idle frames */ sub_handle = GSMTAP_SUB_UM; break; case GSMTAP_CHANNEL_SDCCH: case GSMTAP_CHANNEL_SDCCH4: case GSMTAP_CHANNEL_SDCCH8: case GSMTAP_CHANNEL_TCH_F: case GSMTAP_CHANNEL_TCH_H: sub_handle = GSMTAP_SUB_UM_LAPDM; break; case GSMTAP_CHANNEL_PACCH: if (pinfo->p2p_dir == P2P_DIR_SENT) { sub_handle = GSMTAP_SUB_UM_RLC_MAC_UL; } else { sub_handle = GSMTAP_SUB_UM_RLC_MAC_DL; } break; case GSMTAP_CHANNEL_CBCH51: case GSMTAP_CHANNEL_CBCH52: sub_handle = GSMTAP_SUB_CBCH; break; case GSMTAP_CHANNEL_RACH: default: sub_handle = GSMTAP_SUB_DATA; break; } break; case GSMTAP_TYPE_ABIS: sub_handle = GSMTAP_SUB_ABIS; break; case GSMTAP_TYPE_GB_LLC: sub_handle = GSMTAP_SUB_LLC; break; case GSMTAP_TYPE_GB_SNDCP: sub_handle = GSMTAP_SUB_SNDCP; break; case GSMTAP_TYPE_TETRA_I1: handle_tetra(tvb_get_guint8(tvb, offset+12), payload_tvb, pinfo, tree); return; case GSMTAP_TYPE_WMX_BURST: switch (sub_type) { case GSMTAP_BURST_CDMA_CODE: sub_handle = GSMTAP_SUB_CDMA_CODE; break; case GSMTAP_BURST_FCH: sub_handle = GSMTAP_SUB_FCH; break; case GSMTAP_BURST_FFB: sub_handle = GSMTAP_SUB_FFB; break; case GSMTAP_BURST_PDU: sub_handle = GSMTAP_SUB_PDU; break; case GSMTAP_BURST_HACK: sub_handle = GSMTAP_SUB_HACK; break; case GSMTAP_BURST_PHY_ATTRIBUTES: sub_handle = GSMTAP_SUB_PHY_ATTRIBUTES; break; default: sub_handle = GSMTAP_SUB_DATA; break; } break; case GSMTAP_TYPE_GMR1_UM: switch (sub_type) { case GSMTAP_GMR1_BCCH: sub_handle = GSMTAP_SUB_GMR1_BCCH; break; case GSMTAP_GMR1_CCCH: case GSMTAP_GMR1_AGCH: case GSMTAP_GMR1_PCH: sub_handle = GSMTAP_SUB_GMR1_CCCH; break; case GSMTAP_GMR1_SDCCH: case GSMTAP_GMR1_TCH3 | GSMTAP_GMR1_FACCH: case GSMTAP_GMR1_TCH6 | GSMTAP_GMR1_FACCH: case GSMTAP_GMR1_TCH9 | GSMTAP_GMR1_FACCH: sub_handle = GSMTAP_SUB_GMR1_LAPSAT; break; case GSMTAP_GMR1_RACH: sub_handle = GSMTAP_SUB_GMR1_RACH; break; default: sub_handle = GSMTAP_SUB_DATA; break; } break; case GSMTAP_TYPE_UM_BURST: default: sub_handle = GSMTAP_SUB_DATA; break; } call_dissector(sub_handles[sub_handle], payload_tvb, pinfo, tree); } static const true_false_string sacch_l1h_fpc_mode_vals = { "In use", "Not in use" }; void proto_register_gsmtap(void) { static hf_register_info hf[] = { { &hf_gsmtap_version, { "Version", "gsmtap.version", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_gsmtap_hdrlen, { "Header Length", "gsmtap.hdr_len", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_gsmtap_type, { "Payload Type", "gsmtap.type", FT_UINT8, BASE_DEC, VALS(gsmtap_types), 0, NULL, HFILL } }, { &hf_gsmtap_timeslot, { "Time Slot", "gsmtap.ts", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_gsmtap_arfcn, { "ARFCN", "gsmtap.arfcn", FT_UINT16, BASE_DEC, NULL, GSMTAP_ARFCN_MASK, NULL, HFILL } }, { &hf_gsmtap_uplink, { "Uplink", "gsmtap.uplink", FT_UINT16, BASE_DEC, NULL, GSMTAP_ARFCN_F_UPLINK, NULL, HFILL } }, { &hf_gsmtap_noise_dbm, { "Signal/Noise Ratio (dB)", "gsmtap.snr_db", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_gsmtap_signal_dbm, { "Signal Level (dBm)", "gsmtap.signal_dbm", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_gsmtap_frame_nr, { "GSM Frame Number", "gsmtap.frame_nr", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_gsmtap_burst_type, { "Burst Type", "gsmtap.burst_type", FT_UINT8, BASE_DEC, VALS(gsmtap_bursts), 0, NULL, HFILL }}, { &hf_gsmtap_channel_type, { "Channel Type", "gsmtap.chan_type", FT_UINT8, BASE_DEC, VALS(gsmtap_channels), 0, NULL, HFILL }}, { &hf_gsmtap_tetra_channel_type, { "Channel Type", "gsmtap.tetra_chan_type", FT_UINT8, BASE_DEC, VALS(gsmtap_tetra_channels), 0, NULL, HFILL }}, { &hf_gsmtap_gmr1_channel_type, { "Channel Type", "gsmtap.gmr1_chan_type", FT_UINT8, BASE_DEC, VALS(gsmtap_gmr1_channels), 0, NULL, HFILL }}, { &hf_gsmtap_antenna, { "Antenna Number", "gsmtap.antenna", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_gsmtap_subslot, { "Sub-Slot", "gsmtap.sub_slot", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_sacch_l1h_power_lev, { "MS power level", "gsmtap.sacch_l1.power_lev", FT_UINT8, BASE_DEC, NULL, 0x1f, NULL, HFILL } }, { &hf_sacch_l1h_fpc, { "FPC", "gsmtap.sacch_l1.fpc", FT_BOOLEAN, 8, TFS(&sacch_l1h_fpc_mode_vals), 0x04, NULL, HFILL } }, { &hf_sacch_l1h_ta, { "Actual Timing Advance", "gsmtap.sacch_l1.ta", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, }; static gint *ett[] = { &ett_gsmtap }; proto_gsmtap = proto_register_protocol("GSM Radiotap", "GSMTAP", "gsmtap"); proto_register_field_array(proto_gsmtap, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); gsmtap_dissector_table = register_dissector_table("gsmtap.type", "GSMTAP type", FT_UINT8, BASE_HEX); } void proto_reg_handoff_gsmtap(void) { dissector_handle_t gsmtap_handle; sub_handles[GSMTAP_SUB_DATA] = find_dissector("data"); sub_handles[GSMTAP_SUB_UM] = find_dissector("gsm_a_ccch"); sub_handles[GSMTAP_SUB_UM_LAPDM] = find_dissector("lapdm"); sub_handles[GSMTAP_SUB_UM_RLC_MAC_UL] = find_dissector("gsm_rlcmac_ul"); sub_handles[GSMTAP_SUB_UM_RLC_MAC_DL] = find_dissector("gsm_rlcmac_dl"); sub_handles[GSMTAP_SUB_LLC] = find_dissector("llcgprs"); sub_handles[GSMTAP_SUB_SNDCP] = find_dissector("sndcp"); sub_handles[GSMTAP_SUB_ABIS] = find_dissector("gsm_a_dtap"); sub_handles[GSMTAP_SUB_CDMA_CODE] = find_dissector("wimax_cdma_code_burst_handler"); sub_handles[GSMTAP_SUB_FCH] = find_dissector("wimax_fch_burst_handler"); sub_handles[GSMTAP_SUB_FFB] = find_dissector("wimax_ffb_burst_handler"); sub_handles[GSMTAP_SUB_PDU] = find_dissector("wimax_pdu_burst_handler"); sub_handles[GSMTAP_SUB_HACK] = find_dissector("wimax_hack_burst_handler"); sub_handles[GSMTAP_SUB_PHY_ATTRIBUTES] = find_dissector("wimax_phy_attributes_burst_handler"); sub_handles[GSMTAP_SUB_CBCH] = find_dissector("gsm_cbch"); sub_handles[GSMTAP_SUB_GMR1_BCCH] = find_dissector("gmr1_bcch"); sub_handles[GSMTAP_SUB_GMR1_CCCH] = find_dissector("gmr1_ccch"); sub_handles[GSMTAP_SUB_GMR1_LAPSAT] = find_dissector("lapsat"); sub_handles[GSMTAP_SUB_GMR1_RACH] = find_dissector("gmr1_rach"); gsmtap_handle = create_dissector_handle(dissect_gsmtap, proto_gsmtap); dissector_add_uint("udp.port", GSMTAP_UDP_PORT, gsmtap_handle); }