575 lines
17 KiB
C
575 lines
17 KiB
C
/* packet-sndcp.c
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* Routines for Subnetwork Dependent Convergence Protocol (SNDCP) dissection
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* Copyright 2000, Christian Falckenberg <christian.falckenberg@nortelnetworks.com>
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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 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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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/reassemble.h>
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/* Bitmasks for the bits in the address field
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*/
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#define MASK_X 0x80
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#define MASK_F 0x40
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#define MASK_T 0x20
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#define MASK_M 0x10
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void proto_register_sndcp(void);
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void proto_reg_handoff_sndcp(void);
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/* Initialize the protocol and registered fields
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*/
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static int proto_sndcp = -1;
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static int hf_sndcp_x = -1;
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static int hf_sndcp_f = -1;
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static int hf_sndcp_t = -1;
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static int hf_sndcp_m = -1;
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static int hf_sndcp_nsapi = -1;
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static int hf_sndcp_nsapib = -1;
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static int hf_sndcp_dcomp = -1;
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static int hf_sndcp_pcomp = -1;
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static int hf_sndcp_segment = -1;
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static int hf_sndcp_npdu1 = -1;
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static int hf_sndcp_npdu2 = -1;
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static int hf_sndcp_payload = -1;
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/* These fields are used when reassembling N-PDU fragments
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*/
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static int hf_npdu_fragments = -1;
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static int hf_npdu_fragment = -1;
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static int hf_npdu_fragment_overlap = -1;
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static int hf_npdu_fragment_overlap_conflict = -1;
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static int hf_npdu_fragment_multiple_tails = -1;
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static int hf_npdu_fragment_too_long_fragment = -1;
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static int hf_npdu_fragment_error = -1;
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static int hf_npdu_fragment_count = -1;
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static int hf_npdu_reassembled_in = -1;
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static int hf_npdu_reassembled_length = -1;
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/* Initialize the subtree pointers
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*/
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static gint ett_sndcp = -1;
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static gint ett_sndcp_address_field = -1;
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static gint ett_sndcp_compression_field = -1;
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static gint ett_sndcp_npdu_field = -1;
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static gint ett_npdu_fragment = -1;
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static gint ett_npdu_fragments = -1;
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/* Structure needed for the fragmentation routines in reassemble.c
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*/
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static const fragment_items npdu_frag_items = {
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&ett_npdu_fragment,
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&ett_npdu_fragments,
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&hf_npdu_fragments,
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&hf_npdu_fragment,
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&hf_npdu_fragment_overlap,
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&hf_npdu_fragment_overlap_conflict,
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&hf_npdu_fragment_multiple_tails,
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&hf_npdu_fragment_too_long_fragment,
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&hf_npdu_fragment_error,
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&hf_npdu_fragment_count,
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&hf_npdu_reassembled_in,
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&hf_npdu_reassembled_length,
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/* Reassembled data field */
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NULL,
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"fragments"
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};
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/* dissectors for the data portion of this protocol
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*/
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static dissector_handle_t ip_handle;
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static dissector_handle_t sndcp_handle;
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/* reassembly of N-PDU
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*/
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static reassembly_table npdu_reassembly_table;
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/* value strings
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*/
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static const value_string nsapi_t[] = {
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{ 0, "Escape mechanism for future extensions"},
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{ 1, "Point-to-Multipoint (PTM-M) Information" },
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{ 2, "Reserved for future use" },
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{ 3, "Reserved for future use" },
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{ 4, "Reserved for future use" },
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{ 5, "Dynamically allocated"},
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{ 6, "Dynamically allocated"},
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{ 7, "Dynamically allocated"},
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{ 8, "Dynamically allocated"},
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{ 9, "Dynamically allocated"},
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{ 10, "Dynamically allocated"},
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{ 11, "Dynamically allocated"},
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{ 12, "Dynamically allocated"},
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{ 13, "Dynamically allocated"},
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{ 14, "Dynamically allocated"},
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{ 15, "Dynamically allocated"},
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{ 0, NULL },
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};
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static const value_string nsapi_abrv[] = {
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{ 0, "0"},
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{ 1, "PTM-M" },
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{ 2, "2" },
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{ 3, "3"},
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{ 4, "4" },
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{ 5, "DYN5" },
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{ 6, "DYN6" },
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{ 7, "DYN7" },
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{ 8, "DYN8" },
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{ 9, "DYN9" },
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{ 10, "DYN10" },
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{ 11, "DYN11" },
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{ 12, "DYN12" },
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{ 13, "DYN13" },
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{ 14, "DYN14" },
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{ 15, "DYN15" },
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{ 0, NULL },
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};
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static const value_string compression_vals[] = {
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{ 0, "No compression"},
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{ 1, "Pointer to selected protocol/data compression mechanism" },
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{ 2, "Pointer to selected protocol/data compression mechanism" },
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{ 3, "Pointer to selected protocol/data compression mechanism" },
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{ 4, "Pointer to selected protocol/data compression mechanism" },
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{ 5, "Pointer to selected protocol/data compression mechanism" },
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{ 6, "Pointer to selected protocol/data compression mechanism" },
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{ 7, "Pointer to selected protocol/data compression mechanism" },
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{ 8, "Pointer to selected protocol/data compression mechanism" },
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{ 9, "Pointer to selected protocol/data compression mechanism" },
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{ 10, "Pointer to selected protocol/data compression mechanism" },
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{ 11, "Pointer to selected protocol/data compression mechanism" },
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{ 12, "Pointer to selected protocol/data compression mechanism" },
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{ 13, "Pointer to selected protocol/data compression mechanism" },
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{ 14, "Pointer to selected protocol/data compression mechanism" },
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{ 15, "Pointer to selected protocol/data compression mechanism" },
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{ 0, NULL },
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};
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static const true_false_string x_bit = {
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"Invalid",
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"Set to 0 by transmitting SNDCP entity (ignored by receiver)"
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};
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static const true_false_string f_bit = {
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"This SN-PDU is the first segment of an N-PDU",
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"This SN-PDU is not the first segment of an N-PDU"
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};
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static const true_false_string t_bit = {
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"SN-UNITDATA PDU",
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"SN-DATA PDU"
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};
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static const true_false_string m_bit = {
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"Not the last segment of N-PDU, more segments to follow",
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"Last segment of N-PDU"
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};
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/* Code to actually dissect the packets
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*/
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static int
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dissect_sndcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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guint8 addr_field, comp_field, npdu_field1, dcomp=0, pcomp=0;
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guint16 offset=0, npdu=0, segment=0, npdu_field2;
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tvbuff_t *next_tvb, *npdu_tvb;
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gint len;
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gboolean first, more_frags, unack;
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static int * const addr_fields[] = {
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&hf_sndcp_x,
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&hf_sndcp_f,
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&hf_sndcp_t,
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&hf_sndcp_m,
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&hf_sndcp_nsapib,
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NULL
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};
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/* Set up structures needed to add the protocol subtree and manage it
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*/
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proto_item *ti;
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proto_tree *sndcp_tree, *compression_field_tree, *npdu_field_tree;
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/* Make entries in Protocol column and clear Info column on summary display
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*/
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SNDCP");
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col_clear(pinfo->cinfo, COL_INFO);
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/* create display subtree for the protocol
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*/
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ti = proto_tree_add_item(tree, proto_sndcp, tvb, 0, -1, ENC_NA);
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sndcp_tree = proto_item_add_subtree(ti, ett_sndcp);
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/* get address field from next byte
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*/
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addr_field = tvb_get_guint8(tvb,offset);
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first = addr_field & MASK_F;
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more_frags = addr_field & MASK_M;
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unack = addr_field & MASK_T;
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/* add subtree for the address field
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*/
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proto_tree_add_bitmask_with_flags(sndcp_tree, tvb, offset, hf_sndcp_nsapi,
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ett_sndcp_address_field, addr_fields, ENC_NA, BMT_NO_APPEND);
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offset++;
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/* get compression pointers from next byte if this is the first segment
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*/
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if (first) {
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comp_field = tvb_get_guint8(tvb,offset);
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dcomp = comp_field & 0xF0;
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pcomp = comp_field & 0x0F;
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/* add subtree for the compression field
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*/
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if (tree) {
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if (!pcomp) {
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if (!dcomp) {
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compression_field_tree = proto_tree_add_subtree(sndcp_tree, tvb, offset, 1, ett_sndcp_compression_field, NULL, "No compression");
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}
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else {
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compression_field_tree = proto_tree_add_subtree(sndcp_tree, tvb, offset, 1, ett_sndcp_compression_field, NULL, "Data compression");
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}
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}
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else {
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if (!dcomp) {
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compression_field_tree = proto_tree_add_subtree(sndcp_tree, tvb, offset, 1, ett_sndcp_compression_field, NULL, "Protocol compression");
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}
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else {
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compression_field_tree = proto_tree_add_subtree(sndcp_tree, tvb, offset, 1, ett_sndcp_compression_field, NULL, "Data and Protocol compression");
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}
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}
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proto_tree_add_uint(compression_field_tree, hf_sndcp_dcomp, tvb, offset, 1, comp_field );
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proto_tree_add_uint(compression_field_tree, hf_sndcp_pcomp, tvb, offset, 1, comp_field );
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}
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offset++;
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/* get N-PDU number from next byte for acknowledged mode (only for first segment)
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*/
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if (!unack) {
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npdu = npdu_field1 = tvb_get_guint8(tvb,offset);
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col_add_fstr(pinfo->cinfo, COL_INFO, "SN-DATA N-PDU %d", npdu_field1);
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if (tree) {
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npdu_field_tree = proto_tree_add_subtree_format(sndcp_tree, tvb, offset, 1, ett_sndcp_npdu_field, NULL, "Acknowledged mode, N-PDU %d", npdu_field1 );
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proto_tree_add_uint(npdu_field_tree, hf_sndcp_npdu1, tvb, offset, 1, npdu_field1 );
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}
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offset++;
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}
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}
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/* get segment and N-PDU number from next two bytes for unacknowledged mode
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*/
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if (unack) {
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npdu_field2 = tvb_get_ntohs(tvb, offset);
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segment = (npdu_field2 & 0xF000) >> 12;
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npdu = (npdu_field2 & 0x0FFF);
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col_add_fstr(pinfo->cinfo, COL_INFO, "SN-UNITDATA N-PDU %d (segment %d)", npdu, segment);
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if (tree) {
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npdu_field_tree = proto_tree_add_subtree_format(sndcp_tree, tvb, offset, 2, ett_sndcp_npdu_field, NULL,
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"Unacknowledged mode, N-PDU %d (segment %d)", npdu, segment );
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proto_tree_add_uint(npdu_field_tree, hf_sndcp_segment, tvb, offset, 2, npdu_field2 );
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proto_tree_add_uint(npdu_field_tree, hf_sndcp_npdu2, tvb, offset, 2, npdu_field2 );
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}
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offset += 2;
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}
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/* handle N-PDU data, reassemble if necessary
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*/
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if (first && !more_frags) {
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next_tvb = tvb_new_subset_remaining (tvb, offset);
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if (!dcomp && !pcomp) {
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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}
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else {
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call_data_dissector(next_tvb, pinfo, tree);
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}
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}
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else {
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/* Try reassembling fragments
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*/
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fragment_head *fd_npdu = NULL;
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guint32 reassembled_in = 0;
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gboolean save_fragmented = pinfo->fragmented;
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len = tvb_captured_length_remaining(tvb, offset);
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if(len<=0){
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return offset;
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}
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pinfo->fragmented = TRUE;
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if (unack)
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fd_npdu = fragment_add_seq_check(&npdu_reassembly_table, tvb, offset,
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pinfo, npdu, NULL, segment, len, more_frags);
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else
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fd_npdu = fragment_add(&npdu_reassembly_table, tvb, offset, pinfo, npdu, NULL,
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offset, len, more_frags);
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npdu_tvb = process_reassembled_data(tvb, offset, pinfo,
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"Reassembled N-PDU", fd_npdu, &npdu_frag_items,
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NULL, sndcp_tree);
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if (fd_npdu) {
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/* Reassembled
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*/
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reassembled_in = fd_npdu->reassembled_in;
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if (pinfo->num == reassembled_in) {
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/* Reassembled in this very packet:
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* We can safely hand the tvb to the IP dissector
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*/
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call_dissector(ip_handle, npdu_tvb, pinfo, tree);
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}
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else {
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/* Not reassembled in this packet
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*/
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col_append_fstr(pinfo->cinfo, COL_INFO,
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" (N-PDU payload reassembled in packet %u)",
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fd_npdu->reassembled_in);
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proto_tree_add_item(sndcp_tree, hf_sndcp_payload, tvb, offset, -1, ENC_NA);
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}
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} else {
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/* Not reassembled yet, or not reassembled at all
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*/
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if (unack)
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col_append_fstr(pinfo->cinfo, COL_INFO, " (Unreassembled fragment %u)", segment);
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else
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col_append_str(pinfo->cinfo, COL_INFO, " (Unreassembled fragment)");
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proto_tree_add_item(sndcp_tree, hf_sndcp_payload, tvb, offset, -1, ENC_NA);
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}
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/* Now reset fragmentation information in pinfo
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*/
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pinfo->fragmented = save_fragmented;
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}
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return tvb_captured_length(tvb);
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}
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/* Register the protocol with Wireshark
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this format is required because a script is used to build the C function
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that calls all the protocol registration.
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*/
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void
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proto_register_sndcp(void)
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{
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/* Setup list of header fields
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*/
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static hf_register_info hf[] = {
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{ &hf_sndcp_nsapi,
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{ "Address field NSAPI",
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"sndcp.nsapi",
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FT_UINT8, BASE_DEC, VALS(nsapi_abrv), 0x0,
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"Network Layer Service Access Point Identifier", HFILL
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}
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},
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{ &hf_sndcp_x,
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{ "Spare bit",
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"sndcp.x",
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FT_BOOLEAN,8, TFS(&x_bit), MASK_X,
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"Spare bit (should be 0)", HFILL
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}
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},
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{ &hf_sndcp_f,
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{ "First segment indicator bit",
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"sndcp.f",
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FT_BOOLEAN,8, TFS(&f_bit), MASK_F,
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NULL, HFILL
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}
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},
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{ &hf_sndcp_t,
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{ "Type",
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"sndcp.t",
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FT_BOOLEAN,8, TFS(&t_bit), MASK_T,
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"SN-PDU Type", HFILL
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}
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},
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{ &hf_sndcp_m,
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{ "More bit",
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"sndcp.m",
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FT_BOOLEAN,8, TFS(&m_bit), MASK_M,
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NULL, HFILL
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}
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},
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{ &hf_sndcp_dcomp,
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{ "DCOMP",
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"sndcp.dcomp",
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FT_UINT8, BASE_DEC, VALS(compression_vals), 0xF0,
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"Data compression coding", HFILL
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}
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},
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{ &hf_sndcp_pcomp,
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{ "PCOMP",
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"sndcp.pcomp",
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FT_UINT8, BASE_DEC, VALS(compression_vals), 0x0F,
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"Protocol compression coding", HFILL
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}
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},
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{ &hf_sndcp_nsapib,
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{ "NSAPI",
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"sndcp.nsapib",
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FT_UINT8, BASE_DEC , VALS(nsapi_t), 0xf,
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"Network Layer Service Access Point Identifier",HFILL
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}
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},
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{ &hf_sndcp_segment,
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{ "Segment",
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"sndcp.segment",
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FT_UINT16, BASE_DEC, NULL, 0xF000,
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"Segment number", HFILL
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}
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},
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{ &hf_sndcp_npdu1,
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{ "N-PDU",
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"sndcp.npdu",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL
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}
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},
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{ &hf_sndcp_npdu2,
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{ "N-PDU",
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"sndcp.npdu",
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FT_UINT16, BASE_DEC, NULL, 0x0FFF,
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NULL, HFILL
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}
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},
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{ &hf_sndcp_payload,
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{ "Payload",
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"sndcp.payload",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL
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}
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},
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/* Fragment fields
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*/
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{ &hf_npdu_fragment_overlap,
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{ "Fragment overlap",
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"sndcp.npdu.fragment.overlap",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0,
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"Fragment overlaps with other fragments", HFILL
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}
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},
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{ &hf_npdu_fragment_overlap_conflict,
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{ "Conflicting data in fragment overlap",
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"sndcp.npdu.fragment.overlap.conflict",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0,
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"Overlapping fragments contained conflicting data", HFILL
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}
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},
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{ &hf_npdu_fragment_multiple_tails,
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{ "Multiple tail fragments found",
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"sndcp.npdu.fragment.multipletails",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0,
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"Several tails were found when defragmenting the packet", HFILL
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}
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},
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{ &hf_npdu_fragment_too_long_fragment,
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{ "Fragment too long",
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"sndcp.npdu.fragment.toolongfragment",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0,
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"Fragment contained data past end of packet", HFILL
|
|
}
|
|
},
|
|
{ &hf_npdu_fragment_error,
|
|
{ "Defragmentation error",
|
|
"sndcp.npdu.fragment.error",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"Defragmentation error due to illegal fragments", HFILL
|
|
}
|
|
},
|
|
{ &hf_npdu_fragment_count,
|
|
{ "Fragment count",
|
|
"sndcp.npdu.fragment.count",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_npdu_reassembled_in,
|
|
{ "Reassembled in",
|
|
"sndcp.npdu.reassembled.in",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"N-PDU fragments are reassembled in the given packet", HFILL
|
|
}
|
|
},
|
|
{ &hf_npdu_reassembled_length,
|
|
{ "Reassembled N-PDU length",
|
|
"sndcp.npdu.reassembled.length",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"The total length of the reassembled payload", HFILL
|
|
}
|
|
},
|
|
{ &hf_npdu_fragment,
|
|
{ "N-PDU Fragment",
|
|
"sndcp.npdu.fragment",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_npdu_fragments,
|
|
{ "N-PDU Fragments",
|
|
"sndcp.npdu.fragments",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_sndcp ,
|
|
&ett_sndcp_address_field,
|
|
&ett_sndcp_compression_field,
|
|
&ett_sndcp_npdu_field,
|
|
&ett_npdu_fragment,
|
|
&ett_npdu_fragments,
|
|
};
|
|
|
|
/* Register the protocol name and description */
|
|
proto_sndcp = proto_register_protocol("Subnetwork Dependent Convergence Protocol",
|
|
"SNDCP", "sndcp");
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array(proto_sndcp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
sndcp_handle = register_dissector("sndcp", dissect_sndcp, proto_sndcp);
|
|
reassembly_table_register(&npdu_reassembly_table, &addresses_reassembly_table_functions);
|
|
}
|
|
|
|
/* If this dissector uses sub-dissector registration add a registration routine.
|
|
This format is required because a script is used to find these routines and
|
|
create the code that calls these routines.
|
|
*/
|
|
void
|
|
proto_reg_handoff_sndcp(void)
|
|
{
|
|
/* Register SNDCP dissector with LLC layer for SAPI 3,5,9 and 11
|
|
*/
|
|
dissector_add_uint("llcgprs.sapi", 3, sndcp_handle);
|
|
dissector_add_uint("llcgprs.sapi", 5, sndcp_handle);
|
|
dissector_add_uint("llcgprs.sapi", 9, sndcp_handle);
|
|
dissector_add_uint("llcgprs.sapi", 11, sndcp_handle);
|
|
|
|
/* Find IP and data handle for upper layer dissectors
|
|
*/
|
|
ip_handle = find_dissector_add_dependency("ip", proto_sndcp);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - https://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:
|
|
*/
|