forked from osmocom/wireshark
![Bill Meier](/assets/img/avatar_default.png)
Specifically: - Set packet.h to be the first wireshark #include after config.h and "system" #includes. packet.h added as an #include in some cases when missing. - Remove some #includes included (directly/indirectly) in packet.h. E.g., glib.h. (Done only for those files including packet.h). - As needed, move "system" #includes to be after config.h and before wireshark #includes. - Rework various #include file specifications for consistency. - Misc. Change-Id: Ifaa1a14b50b69fbad38ea4838a49dfe595c54c95 Reviewed-on: https://code.wireshark.org/review/5923 Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com> Reviewed-by: Bill Meier <wmeier@newsguy.com>
468 lines
15 KiB
C
468 lines
15 KiB
C
/* packet-sscop.c
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* Routines for SSCOP (Q.2110, Q.SAAL) frame disassembly
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* Guy Harris <guy@alum.mit.edu>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include "packet-sscop.h"
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void proto_register_sscop(void);
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void proto_reg_handoff_sscop(void);
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int proto_sscop = -1;
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static int hf_sscop_type = -1;
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static int hf_sscop_sq = -1;
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static int hf_sscop_mr = -1;
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static int hf_sscop_s = -1;
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static int hf_sscop_ps = -1;
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static int hf_sscop_r = -1;
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static int hf_sscop_stat_s = -1;
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static int hf_sscop_pad_length = -1;
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static int hf_sscop_source = -1;
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/* static int hf_sscop_stat_count = -1; */
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static gint ett_sscop = -1;
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static gint ett_stat = -1;
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static dissector_handle_t q2931_handle;
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static dissector_handle_t data_handle;
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static dissector_handle_t sscf_nni_handle;
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static dissector_handle_t alcap_handle;
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static dissector_handle_t nbap_handle;
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static module_t *sscop_module;
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static range_t *global_udp_port_range;
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static dissector_handle_t sscop_handle;
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static const enum_val_t sscop_payload_dissector_options[] = {
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{ "data", "Data (no further dissection)", DATA_DISSECTOR },
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{ "Q.2931", "Q.2931", Q2931_DISSECTOR },
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{ "SSCF-NNI", "SSCF-NNI (MTP3-b)", SSCF_NNI_DISSECTOR },
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{ "ALCAP", "ALCAP", ALCAP_DISSECTOR },
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{ "NBAP", "NBAP", NBAP_DISSECTOR },
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{ NULL, NULL, 0 }
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};
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static guint sscop_payload_dissector = Q2931_DISSECTOR;
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static dissector_handle_t default_handle;
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static sscop_info_t sscop_info;
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/*
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* See
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*
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* http://www.protocols.com/pbook/atmsig.htm
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*
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* for some information on SSCOP, although, alas, not the actual PDU
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* type values - those I got from the FreeBSD 3.2 ATM code.
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*/
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/*
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* SSCOP PDU types.
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*/
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#define SSCOP_TYPE_MASK 0x0f
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#define SSCOP_BGN 0x01 /* Begin */
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#define SSCOP_BGAK 0x02 /* Begin Acknowledge */
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#define SSCOP_END 0x03 /* End */
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#define SSCOP_ENDAK 0x04 /* End Acknowledge */
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#define SSCOP_RS 0x05 /* Resynchronization */
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#define SSCOP_RSAK 0x06 /* Resynchronization Acknowledge */
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#define SSCOP_BGREJ 0x07 /* Begin Reject */
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#define SSCOP_SD 0x08 /* Sequenced Data */
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#if 0
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#define SSCOP_SDP 0x09 /* Sequenced Data with Poll */
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#endif
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#define SSCOP_ER 0x09 /* Error Recovery */
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#define SSCOP_POLL 0x0a /* Status Request */
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#define SSCOP_STAT 0x0b /* Solicited Status Response */
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#define SSCOP_USTAT 0x0c /* Unsolicited Status Response */
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#define SSCOP_UD 0x0d /* Unnumbered Data */
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#define SSCOP_MD 0x0e /* Management Data */
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#define SSCOP_ERAK 0x0f /* Error Acknowledge */
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#define SSCOP_S 0x10 /* Source bit in End PDU */
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/*
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* XXX - how to distinguish SDP from ER?
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*/
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static const value_string sscop_type_vals[] = {
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{ SSCOP_BGN, "Begin" },
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{ SSCOP_BGAK, "Begin Acknowledge" },
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{ SSCOP_END, "End" },
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{ SSCOP_ENDAK, "End Acknowledge" },
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{ SSCOP_RS, "Resynchronization" },
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{ SSCOP_RSAK, "Resynchronization Acknowledge" },
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{ SSCOP_BGREJ, "Begin Reject" },
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{ SSCOP_SD, "Sequenced Data" },
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#if 0
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{ SSCOP_SDP, "Sequenced Data with Poll" },
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#endif
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{ SSCOP_ER, "Error Recovery" },
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{ SSCOP_POLL, "Status Request" },
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{ SSCOP_STAT, "Solicited Status Response" },
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{ SSCOP_USTAT, "Unsolicited Status Response" },
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{ SSCOP_UD, "Unnumbered Data" },
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{ SSCOP_MD, "Management Data" },
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{ SSCOP_ERAK, "Error Acknowledge" },
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{ 0, NULL }
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};
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static value_string_ext sscop_type_vals_ext = VALUE_STRING_EXT_INIT(sscop_type_vals);
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/*
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* The SSCOP "header" is a trailer, so the "offsets" are computed based
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* on the length of the packet.
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*/
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/*
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* PDU type.
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*/
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#define SSCOP_PDU_TYPE (reported_length - 4) /* single byte */
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/*
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* Begin PDU, Begin Acknowledge PDU (no N(SQ) in it), Resynchronization
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* PDU, Resynchronization Acknowledge PDU (no N(SQ) in it in Q.SAAL),
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* Error Recovery PDU, Error Recovery Acknoledge PDU (no N(SQ) in it).
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*/
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#define SSCOP_N_SQ (reported_length - 5) /* One byte */
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#define SSCOP_N_MR (reported_length - 4) /* lower 3 bytes thereof */
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/*
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* Sequenced Data PDU (no N(PS) in it), Sequenced Data with Poll PDU,
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* Poll PDU.
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*/
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#define SSCOP_N_PS (reported_length - 8) /* lower 3 bytes thereof */
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#define SSCOP_N_S (reported_length - 4) /* lower 3 bytes thereof */
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/*
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* Solicited Status PDU, Unsolicited Status PDU (no N(PS) in it).
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*/
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#define SSCOP_SS_N_PS (reported_length - 12) /* lower 3 bytes thereof */
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#define SSCOP_SS_N_MR (reported_length - 8) /* lower 3 bytes thereof */
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#define SSCOP_SS_N_R (reported_length - 4) /* lower 3 bytes thereof */
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static void dissect_stat_list(proto_tree *tree, tvbuff_t *tvb,guint h) {
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gint n,i;
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if ((n = (tvb_reported_length(tvb))/4 - h)) {
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tree = proto_tree_add_subtree(tree,tvb,0,n*4,ett_stat,NULL,"SD List");
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for (i = 0; i < n; i++) {
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proto_tree_add_item(tree, hf_sscop_stat_s, tvb, i*4 + 1,3,ENC_BIG_ENDIAN);
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}
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}
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}
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extern void
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dissect_sscop_and_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, dissector_handle_t payload_handle)
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{
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guint reported_length;
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proto_item *ti;
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proto_tree *sscop_tree = NULL;
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guint8 sscop_pdu_type;
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int pdu_len;
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int pad_len;
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tvbuff_t *next_tvb;
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reported_length = tvb_reported_length(tvb); /* frame length */
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sscop_pdu_type = tvb_get_guint8(tvb, SSCOP_PDU_TYPE);
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sscop_info.type = sscop_pdu_type & SSCOP_TYPE_MASK;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SSCOP");
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col_add_str(pinfo->cinfo, COL_INFO, val_to_str_ext(sscop_info.type, &sscop_type_vals_ext,
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"Unknown PDU type (0x%02x)"));
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/*
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* Find the length of the PDU and, if there's any payload and
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* padding, the length of the padding.
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*/
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switch (sscop_info.type) {
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case SSCOP_SD:
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pad_len = (sscop_pdu_type >> 6) & 0x03;
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pdu_len = 4;
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break;
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case SSCOP_BGN:
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case SSCOP_BGAK:
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case SSCOP_BGREJ:
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case SSCOP_END:
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case SSCOP_RS:
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#if 0
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case SSCOP_SDP:
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#endif
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pad_len = (sscop_pdu_type >> 6) & 0x03;
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sscop_info.payload_len = pdu_len = 8;
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break;
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case SSCOP_UD:
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pad_len = (sscop_pdu_type >> 6) & 0x03;
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sscop_info.payload_len = pdu_len = 4;
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break;
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default:
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pad_len = 0;
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pdu_len = reported_length; /* No payload, just SSCOP */
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sscop_info.payload_len = 0;
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break;
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}
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_sscop, tvb,
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reported_length - pdu_len,
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pdu_len, "SSCOP");
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sscop_tree = proto_item_add_subtree(ti, ett_sscop);
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proto_tree_add_item(sscop_tree, hf_sscop_type, tvb, SSCOP_PDU_TYPE, 1,ENC_BIG_ENDIAN);
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switch (sscop_info.type) {
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case SSCOP_BGN:
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case SSCOP_RS:
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case SSCOP_ER:
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proto_tree_add_item(sscop_tree, hf_sscop_sq, tvb, SSCOP_N_SQ, 1,ENC_BIG_ENDIAN);
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proto_tree_add_item(sscop_tree, hf_sscop_mr, tvb, SSCOP_N_MR + 1, 3, ENC_BIG_ENDIAN);
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break;
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case SSCOP_END:
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proto_tree_add_string(sscop_tree, hf_sscop_source, tvb, SSCOP_PDU_TYPE, 1,
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(sscop_pdu_type & SSCOP_S) ? "SSCOP" : "User");
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break;
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case SSCOP_BGAK:
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case SSCOP_RSAK:
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proto_tree_add_item(sscop_tree, hf_sscop_mr, tvb, SSCOP_N_MR + 1, 3, ENC_BIG_ENDIAN);
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break;
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case SSCOP_ERAK:
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proto_tree_add_item(sscop_tree, hf_sscop_mr, tvb, SSCOP_N_MR + 1, 3, ENC_BIG_ENDIAN);
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break;
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case SSCOP_SD:
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proto_tree_add_item(sscop_tree, hf_sscop_s, tvb, SSCOP_N_S + 1, 3, ENC_BIG_ENDIAN);
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break;
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#if 0
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case SSCOP_SDP:
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#endif
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case SSCOP_POLL:
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proto_tree_add_item(sscop_tree, hf_sscop_ps, tvb, SSCOP_N_PS + 1, 3,ENC_BIG_ENDIAN);
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proto_tree_add_item(sscop_tree, hf_sscop_s, tvb, SSCOP_N_S + 1, 3,ENC_BIG_ENDIAN);
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break;
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case SSCOP_STAT:
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proto_tree_add_item(sscop_tree, hf_sscop_ps, tvb, SSCOP_SS_N_PS + 1, 3,ENC_BIG_ENDIAN);
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proto_tree_add_item(sscop_tree, hf_sscop_mr, tvb, SSCOP_SS_N_MR + 1, 3, ENC_BIG_ENDIAN);
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proto_tree_add_item(sscop_tree, hf_sscop_r, tvb, SSCOP_SS_N_R + 1, 3,ENC_BIG_ENDIAN);
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dissect_stat_list(sscop_tree,tvb,3);
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break;
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case SSCOP_USTAT:
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proto_tree_add_item(sscop_tree, hf_sscop_mr, tvb, SSCOP_SS_N_MR + 1, 3, ENC_BIG_ENDIAN);
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proto_tree_add_item(sscop_tree, hf_sscop_r, tvb, SSCOP_SS_N_R + 1, 3,ENC_BIG_ENDIAN);
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dissect_stat_list(sscop_tree,tvb,2);
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break;
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}
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}
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/*
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* Dissect the payload, if any.
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*
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* XXX - what about a Management Data PDU?
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*/
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switch (sscop_info.type) {
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case SSCOP_SD:
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case SSCOP_UD:
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case SSCOP_BGN:
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case SSCOP_BGAK:
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case SSCOP_BGREJ:
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case SSCOP_END:
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case SSCOP_RS:
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#if 0
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case SSCOP_SDP:
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#endif
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if (tree) {
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proto_tree_add_uint(sscop_tree, hf_sscop_pad_length, tvb, SSCOP_PDU_TYPE, 1, pad_len);
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}
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/*
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* Compute length of data in PDU - subtract the trailer length
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* and the pad length from the reported length.
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*/
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reported_length -= (pdu_len + pad_len);
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if (reported_length != 0) {
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/*
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* We know that we have all of the payload, because we know we have
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* at least 4 bytes of data after the payload, i.e. the SSCOP trailer.
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* Therefore, we know that the captured length of the payload is
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* equal to the length of the payload.
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*/
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next_tvb = tvb_new_subset_length(tvb, 0, reported_length);
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if (sscop_info.type == SSCOP_SD)
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{
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call_dissector(payload_handle, next_tvb, pinfo, tree);
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}
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break;
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}
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}
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}
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static void dissect_sscop(tvbuff_t* tvb, packet_info* pinfo,proto_tree* tree)
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{
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struct _sscop_payload_info *p_sscop_info;
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dissector_handle_t subdissector;
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/* Look for packet info for subdissector information */
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p_sscop_info = (struct _sscop_payload_info *)p_get_proto_data(wmem_file_scope(), pinfo, proto_sscop, 0);
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if ( p_sscop_info
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&& ( subdissector = p_sscop_info->subdissector )
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&& ( subdissector == data_handle
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|| subdissector == q2931_handle
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|| subdissector == sscf_nni_handle
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|| subdissector == alcap_handle
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|| subdissector == nbap_handle) )
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dissect_sscop_and_payload(tvb,pinfo,tree,subdissector);
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else
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dissect_sscop_and_payload(tvb,pinfo,tree,default_handle);
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}
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/* Make sure handles for various protocols are initialized */
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static void initialize_handles_once(void) {
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static gboolean initialized = FALSE;
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if (!initialized) {
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q2931_handle = find_dissector("q2931");
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data_handle = find_dissector("data");
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sscf_nni_handle = find_dissector("sscf-nni");
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alcap_handle = find_dissector("alcap");
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nbap_handle = find_dissector("nbap");
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initialized = TRUE;
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}
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}
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gboolean sscop_allowed_subdissector(dissector_handle_t handle)
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{
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initialize_handles_once();
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if (handle == q2931_handle || handle == data_handle
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|| handle == sscf_nni_handle || handle == alcap_handle
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|| handle == nbap_handle)
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return TRUE;
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return FALSE;
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}
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void
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proto_reg_handoff_sscop(void)
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{
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static gboolean prefs_initialized = FALSE;
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static range_t *udp_port_range;
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if (!prefs_initialized) {
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initialize_handles_once();
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prefs_initialized = TRUE;
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} else {
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dissector_delete_uint_range("udp.port", udp_port_range, sscop_handle);
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g_free(udp_port_range);
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}
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udp_port_range = range_copy(global_udp_port_range);
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dissector_add_uint_range("udp.port", udp_port_range, sscop_handle);
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switch(sscop_payload_dissector) {
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case DATA_DISSECTOR: default_handle = data_handle; break;
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case Q2931_DISSECTOR: default_handle = q2931_handle; break;
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case SSCF_NNI_DISSECTOR: default_handle = sscf_nni_handle; break;
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case ALCAP_DISSECTOR: default_handle = alcap_handle; break;
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case NBAP_DISSECTOR: default_handle = nbap_handle; break;
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}
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}
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void
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proto_register_sscop(void)
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{
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static hf_register_info hf[] = {
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{ &hf_sscop_type, { "PDU Type", "sscop.type", FT_UINT8, BASE_HEX|BASE_EXT_STRING, &sscop_type_vals_ext, SSCOP_TYPE_MASK, NULL, HFILL }},
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{ &hf_sscop_sq, { "N(SQ)", "sscop.sq", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_sscop_mr, { "N(MR)", "sscop.mr", FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_sscop_s, { "N(S)", "sscop.s", FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_sscop_ps, { "N(PS)", "sscop.ps", FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_sscop_r, { "N(R)", "sscop.r", FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_sscop_stat_s, { "N(S)", "sscop.stat.s", FT_UINT24, BASE_DEC, NULL, 0x0,NULL, HFILL }},
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{ &hf_sscop_pad_length, { "Pad length", "sscop.pad_length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_sscop_source, { "Source", "sscop.source", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
#if 0
|
|
{ &hf_sscop_stat_count, { "Number of NACKed pdus", "sscop.stat.count", FT_UINT32, BASE_DEC, NULL, 0x0,NULL, HFILL }}
|
|
#endif
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_sscop,
|
|
&ett_stat
|
|
};
|
|
|
|
proto_sscop = proto_register_protocol("SSCOP", "SSCOP", "sscop");
|
|
proto_register_field_array(proto_sscop, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
sscop_handle = register_dissector("sscop", dissect_sscop, proto_sscop);
|
|
|
|
sscop_module = prefs_register_protocol(proto_sscop, proto_reg_handoff_sscop);
|
|
|
|
global_udp_port_range = range_empty();
|
|
|
|
prefs_register_range_preference(sscop_module, "udp.ports",
|
|
"SSCOP UDP port range",
|
|
"Set the UDP port for SSCOP messages encapsulated in UDP (0 to disable)",
|
|
&global_udp_port_range, MAX_UDP_PORT);
|
|
|
|
prefs_register_enum_preference(sscop_module, "payload",
|
|
"SSCOP payload protocol",
|
|
"SSCOP payload (dissector to call on SSCOP payload)",
|
|
(gint *)&sscop_payload_dissector,
|
|
sscop_payload_dissector_options, FALSE);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|