forked from osmocom/wireshark
2989 lines
123 KiB
C
2989 lines
123 KiB
C
/* packet-rohc.c
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* Routines for RObust Header Compression (ROHC) dissection.
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*
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* Copyright 2011, Anders Broman <anders.broman[at]ericsson.com>
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* Per Liedberg <per.liedberg [at]ericsson.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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* 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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* Ref:
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* http://www.ietf.org/rfc/rfc3095.txt RObust Header Compression (ROHC): Framework and four profiles: RTP, UDP, ESP, and uncompressed
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* http://datatracker.ietf.org/doc/rfc4815/ RObust Header Compression (ROHC): Corrections and Clarifications to RFC 3095
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* http://datatracker.ietf.org/doc/rfc5225/ RObust Header Compression Version 2 (ROHCv2): Profiles for RTP, UDP, IP, ESP and UDP-Lite
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/proto.h>
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#include <epan/packet.h>
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#include <epan/etypes.h>
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#include <epan/ipproto.h>
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#include <epan/addr_resolv.h>
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#include <epan/rtp_pt.h>
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#include <epan/expert.h>
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#include <epan/wmem/wmem.h>
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#include "packet-rohc.h"
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void proto_register_rohc(void);
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void proto_reg_handoff_rohc(void);
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static GHashTable *rohc_cid_hash = NULL;
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/* Initialize the protocol and registered fields */
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static int proto_rohc = -1;
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static int hf_rohc_padding = -1;
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static int hf_rohc_add_cid = -1;
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static int hf_rohc_feedback = -1;
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static int hf_rohc_code = -1;
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static int hf_rohc_size = -1;
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static int hf_rohc_ir_packet = -1;
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static int hf_rohc_ir_dyn_packet = -1;
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static int hf_rohc_small_cid = -1;
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static int hf_rohc_large_cid = -1;
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static int hf_rohc_acktype = -1;
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static int hf_rohc_mode = -1;
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static int hf_rohc_sn = -1;
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static int hf_rohc_profile_spec_octet = -1;
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static int hf_rohc_fb1_sn = -1;
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static int hf_rohc_opt_type = -1;
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static int hf_rohc_opt_len = -1;
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static int hf_rohc_crc = -1;
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static int hf_rohc_opt_sn = -1;
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static int hf_rohc_ext_sn = -1;
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static int hf_rohc_opt_clock = -1;
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static int hf_rohc_opt_jitter = -1;
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static int hf_rohc_opt_loss = -1;
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static int hf_rohc_profile = -1;
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static int hf_rohc_d_bit = -1;
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static int hf_rohc_ip_version = -1;
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static int hf_rohc_ip_protocol = -1;
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static int hf_rohc_static_ipv4 = -1;
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static int hf_rohc_ipv4_src = -1;
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static int hf_rohc_ipv4_dst = -1;
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static int hf_rohc_ipv6_flow = -1;
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static int hf_rohc_ipv6_nxt_hdr = -1;
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static int hf_rohc_ipv6_src = -1;
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static int hf_rohc_ipv6_dst = -1;
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static int hf_rohc_static_udp = -1;
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static int hf_rohc_udp_src_port = -1;
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static int hf_rohc_udp_dst_port = -1;
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static int hf_rohc_static_rtp = -1;
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static int hf_rohc_rtp_ssrc = -1;
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static int hf_rohc_dynamic_ipv4 = -1;
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static int hf_rohc_dynamic_udp = -1;
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static int hf_rohc_rtp_tos = -1;
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static int hf_rohc_rtp_ttl = -1;
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static int hf_rohc_rtp_id = -1;
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static int hf_rohc_rtp_df = -1;
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static int hf_rohc_rtp_rnd = -1;
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static int hf_rohc_rtp_nbo = -1;
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static int hf_rohc_dynamic_udp_checksum = -1;
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static int hf_rohc_dynamic_rtp =-1;
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static int hf_rohc_rtp_v = -1;
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static int hf_rohc_rtp_p = -1;
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static int hf_rohc_rtp_rx = -1;
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static int hf_rohc_rtp_cc = -1;
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static int hf_rohc_rtp_m = -1;
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static int hf_rohc_rtp_pt = -1;
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static int hf_rohc_rtp_sn = -1;
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static int hf_rohc_rtp_timestamp = -1;
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static int hf_rohc_rtp_x = -1;
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static int hf_rohc_rtp_mode = -1;
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static int hf_rohc_rtp_tis = -1;
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static int hf_rohc_rtp_tss = -1;
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static int hf_rohc_rtp_ts_stride = -1;
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static int hf_rohc_rtp_time_stride = -1;
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static int hf_rohc_var_len = -1;
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static int hf_rohc_ipv6_tc = -1;
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static int hf_rohc_ipv6_hop_limit = -1;
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static int hf_rohc_ir_pkt_frame = -1;
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static int hf_rohc_ir_previous_frame = -1;
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static int hf_rohc_comp_sn = -1;
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static int hf_rohc_r_0_crc = -1;
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static int hf_rohc_x = -1;
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static int hf_rohc_ts = -1;
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static int hf_rohc_comp_ip_id = -1;
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static int hf_rohc_t = -1;
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static int hf_rohc_compressed_list = -1;
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static int hf_rohc_compressed_list_et = -1;
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static int hf_rohc_compressed_list_gp = -1;
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static int hf_rohc_compressed_list_ps = -1;
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static int hf_rohc_compressed_list_res = -1;
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static int hf_rohc_compressed_list_count = -1;
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static int hf_rohc_compressed_list_cc = -1;
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static int hf_rohc_compressed_list_xi_1 = -1;
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static int hf_rohc_compressed_list_gen_id = -1;
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static int hf_rohc_compressed_list_ref_id = -1;
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static int hf_rohc_compressed_list_mask_size = -1;
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static int hf_rohc_compressed_list_ins_bit_mask = -1;
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static int hf_rohc_compressed_list_rem_bit_mask = -1;
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static int hf_rohc_spare_bits = -1;
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static int hf_rohc_ip_id = -1;
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static int hf_rohc_udp_checksum = -1;
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static int ett_rohc = -1;
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static int ett_rohc_conf = -1;
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static int ett_rohc_fb = -1;
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static int ett_rohc_feedback = -1;
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static int ett_rohc_ir = -1;
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static int ett_rohc_ir_dyn = -1;
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static int ett_rohc_static_ipv4 = -1;
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static int ett_rohc_static_udp = -1;
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static int ett_rohc_static_rtp = -1;
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static int ett_rohc_rtp_static = -1;
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static int ett_rohc_rtp_dynamic = -1;
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static int ett_rohc_dynamic_ipv4 = -1;
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static int ett_rohc_dynamic_udp = -1;
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static int ett_rohc_dynamic_rtp = -1;
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static int ett_rohc_compressed_list = -1;
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static int ett_rohc_packet = -1;
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static expert_field ei_rohc_profile_spec_octet = EI_INIT;
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static expert_field ei_rohc_rohc_opt_clock = EI_INIT;
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static expert_field ei_rohc_opt_jitter = EI_INIT;
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static expert_field ei_rohc_feedback_type_2_is_not_applicable_for_uncompressed_profile = EI_INIT;
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static dissector_handle_t rohc_handle;
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static dissector_handle_t ip_handle;
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static dissector_handle_t ipv6_handle;
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static dissector_handle_t data_handle;
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typedef struct _rohc_cid_context_t
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{
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guint16 rohc_ip_version;
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gboolean large_cid_present;
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enum rohc_mode mode;
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enum rohc_d_mode d_mode;
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gboolean rnd;
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gboolean udp_checksum_present;
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guint16 profile;
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gint prev_ir_frame_number; /* The frame number of the previous IR packet seen */
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gint ir_frame_number; /* The frame number of the latest IR packet seen */
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} rohc_cid_context_t;
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/* ROHC Profiles */
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#define ROHC_PROFILE_UNCOMPRESSED 0
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#define ROHC_PROFILE_RTP 1
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#define ROHC_PROFILE_UDP 2
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#define ROHC_PROFILE_IP 4
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#define ROHC_PROFILE_UNKNOWN 0xFFFF
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static const value_string rohc_profile_vals[] =
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{
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{ 0x0000, "Uncompressed" }, /*RFC 5795*/
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{ 0x0001, "RTP" }, /*RFC 3095*/
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{ 0x0002, "UDP" }, /*RFC 3095*/
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{ 0x0003, "ESP" }, /*RFC 3095*/
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{ 0x0004, "IP" }, /*RFC 3843*/
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{ 0x0005, "LLA" }, /*RFC 3242*/
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{ 0x0105, "LLA with R-mode" }, /*RFC 3408*/
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{ 0x0006, "TCP" }, /*RFC 4996*/
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{ 0x0007, "RTP/UDP-Lite" }, /*RFC 4019*/
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{ 0x0008, "UDP-Lite" }, /*RFC 4019*/
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{ 0x0101, "v2 RTP" }, /*RFC 5225*/
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{ 0x0102, "v2 UDP" }, /*RFC 5225*/
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{ 0x0103, "v2 ESP" }, /*RFC 5225*/
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{ 0x0104, "v2 IP" }, /*RFC 5225*/
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{ 0x0107, "v2 RTP/UDP-Lite" }, /*RFC 5225*/
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{ 0x0108, "v2 UDP-Lite" }, /*RFC 5225*/
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{ 0, NULL },
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};
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/* IPv4 hard wired for now */
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static guint16 g_profile = ROHC_PROFILE_UNKNOWN;
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static guint8 g_version = 4;
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static const value_string rohc_acktype_vals[] =
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{
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{ 0, "ACK" },
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{ 1, "NACK" },
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{ 2, "STATIC-NACK" },
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{ 3, "reserved (MUST NOT be used. Otherwise unparsable)" },
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{ 0, NULL },
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};
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static const value_string rohc_mode_vals[] =
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{
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{ 0, "Reserved" },
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{ 1, "Unidirectional" },
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{ 2, "Bidirectional Optimistic" },
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{ 3, "Bidirectional Reliable" },
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{ 0, NULL },
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};
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static const value_string rohc_opt_type_vals[] =
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{
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{ 1, "CRC" },
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{ 2, "REJECT" },
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{ 3, "SN-NOT-VALID" },
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{ 4, "SN" },
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{ 5, "CLOCK" },
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{ 6, "JITTER" },
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{ 7, "LOSS" },
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{ 0, NULL },
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};
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static const value_string rohc_ip_version_vals[] =
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{
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{ 4, "IPv4" },
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{ 6, "IPv6" },
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{ 0, NULL },
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};
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static const value_string rohc_var_len_vals[] =
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{
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{ 0, "One octet" },
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{ 2, "Two octets" },
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{ 6, "Three octets" },
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{ 7, "Four octets" },
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{ 0, NULL },
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};
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static const value_string compressed_list_encoding_type_vals[] =
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{
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{ 0, "Generic scheme" },
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{ 1, "Insertion only scheme" },
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{ 2, "Removal only scheme" },
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{ 3, "Remove then insert scheme" },
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{ 0, NULL },
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};
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static const value_string compressed_list_ps_vals[] =
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{
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{ 0, "4-bit XI fields" },
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{ 1, "8-bit XI fields" },
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{ 0, NULL },
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};
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/* 4.5.6. Self-describing variable-length values */
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static guint32
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get_self_describing_var_len_val(tvbuff_t *tvb, proto_tree *tree, int offset, int hf_index, guint8 *val_len){
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guint8 oct;
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guint32 val = 0;
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int num_bits = 0, bit_offset = offset <<3;
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oct = tvb_get_guint8(tvb, offset);
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if((oct&0x80)==0){
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/* One octet */
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*val_len = 1;
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val = (oct&0x7f);
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proto_tree_add_bits_item(tree, hf_rohc_var_len, tvb, bit_offset, 1, ENC_BIG_ENDIAN);
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num_bits = 7;
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bit_offset++;
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}else if((oct&0xc0)==0x80){
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/* Two octets */
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*val_len = 2;
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proto_tree_add_bits_item(tree, hf_rohc_var_len, tvb, bit_offset, 2, ENC_BIG_ENDIAN);
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bit_offset+=2;
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num_bits = 14;
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val = tvb_get_ntohs(tvb, offset)&0x3fff;
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}else if((oct&0xe0)==0xc0){
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/* Three octets */
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*val_len = 3;
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proto_tree_add_bits_item(tree, hf_rohc_var_len, tvb, bit_offset, 3, ENC_BIG_ENDIAN);
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bit_offset+=3;
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num_bits = 21;
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val = tvb_get_ntoh24(tvb, offset)&0x1fffff;
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}else if ((oct&0xe0)==0xe0){
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/* Four octets */
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*val_len = 4;
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proto_tree_add_bits_item(tree, hf_rohc_var_len, tvb, bit_offset, 4, ENC_BIG_ENDIAN);
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bit_offset+=3;
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num_bits = 29;
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val = tvb_get_ntohl(tvb, offset)&0x1fffffff;
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}
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proto_tree_add_bits_item(tree, hf_index, tvb, bit_offset, num_bits, ENC_BIG_ENDIAN);
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return val;
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}
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/* 5.7.1. Packet type 0: UO-0, R-0, R-0-CRC */
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static int
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dissect_rohc_pkt_type_0(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, guint8 pkt_type, rohc_cid_context_t *rohc_cid_context)
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{
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guint8 val_len = 0;
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guint64 sn;
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proto_item *ti;
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proto_tree *pkt_tree;
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switch(rohc_cid_context->mode){
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case RELIABLE_BIDIRECTIONAL: /* R-mode */
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if((pkt_type&0xc0)==0x00){
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/* R-0
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*
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* 0 1 2 3 4 5 6 7
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* +---+---+---+---+---+---+---+---+
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* | 0 0 | SN |
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* +===+===+===+===+===+===+===+===+
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*/
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if (rohc_cid_context->large_cid_present == TRUE) {
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/* Handle Large CID:s here */
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get_self_describing_var_len_val(tvb, tree, offset+1, hf_rohc_large_cid, &val_len);
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}
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col_set_str(pinfo->cinfo, COL_INFO, "R-0");
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ti = proto_tree_add_text(tree, tvb, offset, 1+val_len, "R-0 packet");
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pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
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sn = tvb_get_bits8(tvb,(offset<<3)+2, 6);
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proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3)+2, 6, ENC_BIG_ENDIAN);
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offset += 1 + val_len;
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/* Show SN in info column */
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col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", (guint)sn);
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}else if((pkt_type&0xc0)==0x40){
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/* R-0-CRC
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*
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* 0 1 2 3 4 5 6 7
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* +---+---+---+---+---+---+---+---+
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* | 0 1 | SN |
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* +===+===+===+===+===+===+===+===+
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* |SN | CRC |
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* +---+---+---+---+---+---+---+---+
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*/
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crumb_spec_t rohc_sn_crumbs[] = {
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{ 2, 6},
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{ 8, 1},
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{ 0, 0}
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};
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if (rohc_cid_context->large_cid_present == TRUE) {
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/* Handle Large CID:s here */
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get_self_describing_var_len_val(tvb, tree, offset+1, hf_rohc_large_cid, &val_len);
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rohc_sn_crumbs[1].crumb_bit_offset += val_len*8;
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}
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col_set_str(pinfo->cinfo, COL_INFO, "R-0-CRC");
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ti = proto_tree_add_text(tree, tvb, offset, 2+val_len, "R-0-CRC packet");
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pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
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proto_tree_add_split_bits_item_ret_val(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3),
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rohc_sn_crumbs, &sn);
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offset += 1 + val_len;
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proto_tree_add_bits_item(pkt_tree, hf_rohc_r_0_crc, tvb, (offset<<3)+1, 7, ENC_BIG_ENDIAN);
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offset++;
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/* Show SN in info column */
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col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", (guint)sn);
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}
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break;
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case UNIDIRECTIONAL: /* U-mode */
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/* Fall trough */
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case OPTIMISTIC_BIDIRECTIONAL: /* O-mode */
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/* UO-0
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*
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* 0 1 2 3 4 5 6 7
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* +---+---+---+---+---+---+---+---+
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* | 0 | SN | CRC |
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* +===+===+===+===+===+===+===+===+
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*/
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if (rohc_cid_context->large_cid_present == TRUE) {
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/* Handle Large CID:s here */
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get_self_describing_var_len_val(tvb, tree, offset+1, hf_rohc_large_cid, &val_len);
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}
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col_set_str(pinfo->cinfo, COL_INFO, "UO-0");
|
|
ti = proto_tree_add_text(tree, tvb, offset, 1+val_len, "UO-0 packet");
|
|
pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
|
|
sn = tvb_get_bits8(tvb,(offset<<3)+1, 4);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3)+1, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_r_0_crc, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
|
|
offset += 1 + val_len;
|
|
/* Show SN in info column */
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", (guint)sn);
|
|
break;
|
|
default:
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Packet type 0");
|
|
break;
|
|
}
|
|
|
|
return offset;
|
|
|
|
}
|
|
|
|
/* 5.7.5. Extension formats */
|
|
static int
|
|
dissect_rohc_ext_format(tvbuff_t *tvb, proto_tree *tree, int offset, guint8 t, rohc_cid_context_t *rohc_cid_context)
|
|
{
|
|
guint8 ext_type = tvb_get_guint8(tvb, offset) & 0xc0;
|
|
|
|
proto_tree_add_bits_item(tree, hf_rohc_comp_sn, tvb, (offset<<3)+2, 3, ENC_BIG_ENDIAN);
|
|
if (ext_type == 0x00) {
|
|
/* Extension 0:
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 0 0 | SN | +T |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
if ((t == 0) || (rohc_cid_context->profile == ROHC_PROFILE_UDP)) {
|
|
proto_tree_add_bits_item(tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
|
|
} else {
|
|
proto_tree_add_bits_item(tree, hf_rohc_ts, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
|
|
}
|
|
offset++;
|
|
} else if (ext_type == 0x40) {
|
|
/* Extension 1:
|
|
*
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 0 1 | SN | +T |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | -T |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
if (rohc_cid_context->profile == ROHC_PROFILE_UDP) {
|
|
proto_tree_add_bits_item(tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+5, 11, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}else if (t == 0) {
|
|
proto_tree_add_bits_item(tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
proto_tree_add_bits_item(tree, hf_rohc_ts, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
|
|
} else if (t == 1) {
|
|
proto_tree_add_bits_item(tree, hf_rohc_ts, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
proto_tree_add_bits_item(tree, hf_rohc_comp_ip_id, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
|
|
} else {
|
|
proto_tree_add_bits_item(tree, hf_rohc_ts, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
proto_tree_add_bits_item(tree, hf_rohc_ts, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
|
|
}
|
|
offset++;
|
|
} else if (ext_type == 0x80) {
|
|
/* Extension 2:
|
|
*
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 0 | SN | +T |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | +T |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | -T |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
if (rohc_cid_context->profile == ROHC_PROFILE_UDP) {
|
|
proto_tree_add_bits_item(tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+5, 11, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
proto_tree_add_bits_item(tree, hf_rohc_comp_ip_id, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
|
|
}else if (t == 0) {
|
|
proto_tree_add_bits_item(tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+5, 11, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
proto_tree_add_bits_item(tree, hf_rohc_ts, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
|
|
} else if (t == 1) {
|
|
proto_tree_add_bits_item(tree, hf_rohc_ts, tvb, (offset<<3)+5, 11, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
proto_tree_add_bits_item(tree, hf_rohc_comp_ip_id, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
|
|
} else {
|
|
proto_tree_add_bits_item(tree, hf_rohc_ts, tvb, (offset<<3)+5, 11, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
proto_tree_add_bits_item(tree, hf_rohc_ts, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
|
|
}
|
|
offset++;
|
|
} else {
|
|
proto_tree_add_text(tree, tvb, offset, -1, "extension 3[Not dissected yet]");
|
|
if (tvb_length_remaining(tvb, offset) > 0)
|
|
offset += tvb_length_remaining(tvb, offset);
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
/* 5.7.2. Packet type 1 (R-mode): R-1, R-1-TS, R-1-ID */
|
|
static int
|
|
dissect_rohc_pkt_type_1_r_mode(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, rohc_cid_context_t *rohc_cid_context)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *pkt_tree;
|
|
guint8 val_len = 0, x, sn, t = 0xff;
|
|
int start_offset = offset;
|
|
|
|
if (rohc_cid_context->large_cid_present == TRUE) {
|
|
/* Handle Large CID:s here */
|
|
get_self_describing_var_len_val(tvb, tree, offset+1, hf_rohc_large_cid, &val_len);
|
|
}
|
|
|
|
if ((rohc_cid_context->rohc_ip_version != 4) ||
|
|
(rohc_cid_context->rnd == 1) ||
|
|
(rohc_cid_context->profile == ROHC_PROFILE_UDP)) {
|
|
/* R-1 (RTP profile)
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 0 | SN |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* | M | X | TS |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
/* R-1 (UDP profile)
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 0 | SN |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* | X | IP-ID |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
col_set_str(pinfo->cinfo, COL_INFO, "R-1");
|
|
ti = proto_tree_add_text(tree, tvb, offset, -1, "R-1 packet");
|
|
pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
|
|
sn = tvb_get_bits8(tvb, (offset<<3)+2, 6);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3)+2, 6, ENC_BIG_ENDIAN);
|
|
offset += 1 + val_len;
|
|
/* Show SN in info column */
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", sn);
|
|
if (rohc_cid_context->profile == ROHC_PROFILE_UDP) {
|
|
x= tvb_get_bits8(tvb, (offset<<3), 1);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_x, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+1, 7, ENC_BIG_ENDIAN);
|
|
} else {
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_rtp_m, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
|
|
x = tvb_get_bits8(tvb, (offset<<3)+1, 1);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_x, tvb, (offset<<3)+1, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_ts, tvb, (offset<<3)+2, 6, ENC_BIG_ENDIAN);
|
|
}
|
|
offset++;
|
|
} else {
|
|
t = tvb_get_bits8(tvb, ((offset+1+val_len)<<3)+2, 1);
|
|
if (t == 0) {
|
|
/* R-1-ID
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 0 | SN |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* | M | X |T=0| IP-ID |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
col_set_str(pinfo->cinfo, COL_INFO, "R-1-ID");
|
|
ti = proto_tree_add_text(tree, tvb, offset, -1, "R-1-ID packet");
|
|
pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
|
|
} else {
|
|
/* R-1-TS
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 0 | SN |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* | M | X |T=1| TS |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
col_set_str(pinfo->cinfo, COL_INFO, "R-1-TS");
|
|
ti = proto_tree_add_text(tree, tvb, offset, -1, "R-1-TS packet");
|
|
pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
|
|
}
|
|
sn = tvb_get_bits8(tvb, (offset<<3)+2, 6);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3)+2, 6, ENC_BIG_ENDIAN);
|
|
offset += 1 + val_len;
|
|
/* Show SN in info column */
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", sn);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_rtp_m, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
|
|
x = tvb_get_bits8(tvb, (offset<<3)+1, 1);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_x, tvb, (offset<<3)+1, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_t, tvb, (offset<<3)+2, 1, ENC_BIG_ENDIAN);
|
|
if (t == 0) {
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
|
|
} else {
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_ts, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
|
|
}
|
|
offset++;
|
|
}
|
|
if (x) {
|
|
offset = dissect_rohc_ext_format(tvb, pkt_tree, offset, t, rohc_cid_context);
|
|
}
|
|
proto_item_set_len(ti, offset-start_offset);
|
|
|
|
return offset;
|
|
}
|
|
|
|
/* 5.7.3. Packet type 1 (U/O-mode): UO-1, UO-1-ID, UO-1-TS */
|
|
static int
|
|
dissect_rohc_pkt_type_1_u_o_mode(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, rohc_cid_context_t *rohc_cid_context)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *pkt_tree;
|
|
guint8 val_len = 0, x = 0, sn, t = 0xff;
|
|
int start_offset = offset;
|
|
|
|
if (rohc_cid_context->large_cid_present == TRUE) {
|
|
/* Handle Large CID:s here */
|
|
get_self_describing_var_len_val(tvb, tree, offset+1, hf_rohc_large_cid, &val_len);
|
|
}
|
|
|
|
if ((rohc_cid_context->rohc_ip_version != 4) ||
|
|
(rohc_cid_context->rnd == 1) ||
|
|
(rohc_cid_context->profile == ROHC_PROFILE_UDP)) {
|
|
/* UO-1 (RTP profile)
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 0 | TS |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* | M | SN | CRC |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
/* UO-1 (UDP profile)
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 0 | IP-ID |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* | SN | CRC |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
col_set_str(pinfo->cinfo, COL_INFO, "UO-1");
|
|
ti = proto_tree_add_text(tree, tvb, offset, -1, "UO-1 packet");
|
|
pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
|
|
if (rohc_cid_context->profile == ROHC_PROFILE_UDP) {
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+2, 6, ENC_BIG_ENDIAN);
|
|
offset += 1 + val_len;
|
|
sn = tvb_get_bits8(tvb, (offset<<3), 5);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3), 5, ENC_BIG_ENDIAN);
|
|
} else {
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_ts, tvb, (offset<<3)+2, 6, ENC_BIG_ENDIAN);
|
|
offset += 1 + val_len;
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_rtp_m, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
|
|
sn = tvb_get_bits8(tvb, (offset<<3)+1, 4);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3)+1, 4, ENC_BIG_ENDIAN);
|
|
}
|
|
/* Show SN in info column */
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", sn);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_crc, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
} else {
|
|
t = tvb_get_bits8(tvb, ((offset)<<3)+2, 1);
|
|
if (t == 0) {
|
|
/* UO-1-ID
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 0 |T=0| IP-ID |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* | X | SN | CRC |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
col_set_str(pinfo->cinfo, COL_INFO, "UO-1-ID");
|
|
ti = proto_tree_add_text(tree, tvb, offset, -1, "UO-1-ID packet");
|
|
pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_t, tvb, (offset<<3)+2, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
|
|
offset += 1 + val_len;
|
|
x = tvb_get_bits8(tvb, (offset<<3), 1);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_x, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
|
|
} else {
|
|
/* UO-1-TS
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 0 |T=1| TS |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* | M | SN | CRC |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
col_set_str(pinfo->cinfo, COL_INFO, "UO-1-TS");
|
|
ti = proto_tree_add_text(tree, tvb, offset, -1, "UO-1-TS packet");
|
|
pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_t, tvb, (offset<<3)+2, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_ts, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
|
|
offset += 1 + val_len;
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_rtp_m, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
|
|
}
|
|
sn = tvb_get_bits8(tvb, (offset<<3)+1, 4);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3)+1, 4, ENC_BIG_ENDIAN);
|
|
/* Show SN in info column */
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", sn);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_crc, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
if (x) {
|
|
offset = dissect_rohc_ext_format(tvb, pkt_tree, offset, t, rohc_cid_context);
|
|
}
|
|
proto_item_set_len(ti, offset-start_offset);
|
|
|
|
return offset;
|
|
}
|
|
|
|
/* 5.7.4. Packet type 2: UOR-2 */
|
|
static int
|
|
dissect_rohc_pkt_type_2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, rohc_cid_context_t *rohc_cid_context)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *pkt_tree;
|
|
guint8 val_len = 0, x, sn, t = 0xff;
|
|
int start_offset = offset;
|
|
|
|
if (rohc_cid_context->large_cid_present == TRUE) {
|
|
/* Handle Large CID:s here */
|
|
get_self_describing_var_len_val(tvb, tree, offset+1, hf_rohc_large_cid, &val_len);
|
|
}
|
|
|
|
if ((rohc_cid_context->rohc_ip_version != 4) ||
|
|
(rohc_cid_context->rnd == 1) ||
|
|
(rohc_cid_context->profile == ROHC_PROFILE_UDP)) {
|
|
/* UOR-2 (RTP profile)
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 1 0 | TS |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* |TS | M | SN |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | X | CRC |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
/* UOR-2 (UDP profile)
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 1 0 | SN |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* | X | CRC |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
col_set_str(pinfo->cinfo, COL_INFO, "UOR-2");
|
|
ti = proto_tree_add_text(tree, tvb, offset, -1, "UOR-2 packet");
|
|
pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
|
|
if (rohc_cid_context->profile == ROHC_PROFILE_UDP) {
|
|
sn = tvb_get_bits8(tvb, (offset<<3)+3, 5);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
|
|
offset += 1 + val_len;
|
|
/* Show SN in info column */
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", sn);
|
|
} else {
|
|
crumb_spec_t rohc_ts_crumbs[] = {
|
|
{ 2, 6},
|
|
{ 8, 1},
|
|
{ 0, 0}
|
|
};
|
|
rohc_ts_crumbs[1].crumb_bit_offset += val_len*8;
|
|
proto_tree_add_split_bits_item_ret_val(pkt_tree, hf_rohc_ts, tvb, (offset<<3),
|
|
rohc_ts_crumbs, NULL);
|
|
offset += 1 + val_len;
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_rtp_m, tvb, (offset<<3)+1, 1, ENC_BIG_ENDIAN);
|
|
sn = tvb_get_bits8(tvb, (offset<<3)+2, 6);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3)+2, 6, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
/* Show SN in info column */
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", sn);
|
|
}
|
|
x = tvb_get_bits8(tvb, (offset<<3), 1);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_x, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_crc, tvb, (offset<<3)+1, 7, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
} else {
|
|
t = tvb_get_bits8(tvb, ((offset+1+val_len)<<3), 1);
|
|
if (t == 0) {
|
|
/* UOR-2-ID
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 1 0 | IP-ID |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* |T=0| M | SN |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | X | CRC |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
col_set_str(pinfo->cinfo, COL_INFO, "UOR-2-ID");
|
|
ti = proto_tree_add_text(tree, tvb, offset, -1, "UOR-2-ID packet");
|
|
pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
|
|
} else {
|
|
/* UOR-2-TS
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 1 0 | TS |
|
|
* +===+===+===+===+===+===+===+===+
|
|
* |T=1| M | SN |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | X | CRC |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
col_set_str(pinfo->cinfo, COL_INFO, "UOR-2-TS");
|
|
ti = proto_tree_add_text(tree, tvb, offset, -1, "UOR-2-TS packet");
|
|
pkt_tree = proto_item_add_subtree(ti, ett_rohc_packet);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_ts, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
|
|
}
|
|
offset += 1 + val_len;
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_t, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_rtp_m, tvb, (offset<<3)+1, 1, ENC_BIG_ENDIAN);
|
|
sn = tvb_get_bits8(tvb, (offset<<3)+2, 6);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3)+2, 6, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
/* Show SN in info column */
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", sn);
|
|
x = tvb_get_bits8(tvb, (offset<<3), 1);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_x, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(pkt_tree, hf_rohc_crc, tvb, (offset<<3)+1, 7, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
if (x) {
|
|
offset = dissect_rohc_ext_format(tvb, pkt_tree, offset, t, rohc_cid_context);
|
|
}
|
|
proto_item_set_len(ti, offset-start_offset);
|
|
|
|
return offset;
|
|
}
|
|
|
|
static void
|
|
dissect_rohc_feedback_data(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset, gint16 feedback_data_len,
|
|
rohc_info *p_rohc_info, guint16 cid, gboolean cid_context){
|
|
|
|
proto_item *ti;
|
|
proto_tree *rohc_feedback_tree;
|
|
guint8 opt, opt_len, oct;
|
|
rohc_cid_context_t *rohc_cid_context = NULL;
|
|
gint key = cid;
|
|
guint32 sn;
|
|
|
|
if (!pinfo->fd->flags.visited){
|
|
rohc_cid_context = (rohc_cid_context_t*)g_hash_table_lookup(rohc_cid_hash, GUINT_TO_POINTER(key));
|
|
if(rohc_cid_context){
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0, rohc_cid_context);
|
|
}
|
|
}else{
|
|
rohc_cid_context = (rohc_cid_context_t*)p_get_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0);
|
|
}
|
|
|
|
if(!rohc_cid_context){
|
|
if (cid_context) {
|
|
/* Reuse info coming from private data */
|
|
rohc_cid_context = wmem_new(wmem_packet_scope(), rohc_cid_context_t);
|
|
/*rohc_cid_context->d_mode;*/
|
|
rohc_cid_context->rnd = p_rohc_info->rnd;
|
|
rohc_cid_context->udp_checksum_present = p_rohc_info->udp_checksum_present;
|
|
rohc_cid_context->profile = p_rohc_info->profile;
|
|
rohc_cid_context->mode = p_rohc_info->mode;
|
|
rohc_cid_context->rohc_ip_version = p_rohc_info->rohc_ip_version;
|
|
rohc_cid_context->large_cid_present = p_rohc_info->large_cid_present;
|
|
rohc_cid_context->prev_ir_frame_number = -1;
|
|
rohc_cid_context->ir_frame_number = -1;
|
|
} else {
|
|
/* No context info, not much we can do */
|
|
proto_item_append_text(p_rohc_info->last_created_item, " (type %d)", (feedback_data_len==1) ? 1 : 2);
|
|
proto_tree_add_text(tree, tvb, offset, feedback_data_len, "profile-specific information[Profile not known]");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if(feedback_data_len==1){
|
|
/* FEEDBACK-1 */
|
|
proto_item_append_text(p_rohc_info->last_created_item, " (type 1)");
|
|
oct = tvb_get_guint8(tvb, offset);
|
|
switch(rohc_cid_context->profile){
|
|
case ROHC_PROFILE_UNCOMPRESSED: /* 0 */
|
|
ti = proto_tree_add_item(tree, hf_rohc_profile_spec_octet, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
if (oct) {
|
|
expert_add_info_format(pinfo, ti, &ei_rohc_profile_spec_octet, "Invalid profile-specific octet value (0x%02X)", oct);
|
|
}
|
|
break;
|
|
case ROHC_PROFILE_RTP: /* 1 */
|
|
case ROHC_PROFILE_UDP: /* 2 */
|
|
/*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | SN |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*
|
|
*/
|
|
|
|
proto_tree_add_item(tree, hf_rohc_fb1_sn, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", oct);
|
|
break;
|
|
default:
|
|
proto_tree_add_text(tree, tvb, offset, feedback_data_len, "profile-specific information[Not dissected yet]");
|
|
break;
|
|
}
|
|
return;
|
|
}
|
|
/* FEEDBACK-2 */
|
|
proto_item_append_text(p_rohc_info->last_created_item, " (type 2)");
|
|
switch(rohc_cid_context->profile){
|
|
case ROHC_PROFILE_UNCOMPRESSED: /* 0 */
|
|
expert_add_info(pinfo, p_rohc_info->last_created_item, &ei_rohc_feedback_type_2_is_not_applicable_for_uncompressed_profile);
|
|
break;
|
|
case ROHC_PROFILE_RTP: /* 1 */
|
|
case ROHC_PROFILE_UDP: /* 2 */
|
|
ti = proto_tree_add_text(tree, tvb, offset, feedback_data_len, "%s profile-specific information",
|
|
(rohc_cid_context->profile == ROHC_PROFILE_RTP) ? "RTP" : "UDP");
|
|
rohc_feedback_tree = proto_item_add_subtree(ti, ett_rohc_feedback);
|
|
/* Set mode at first pass? Do we need a new context for the following frames?
|
|
*
|
|
*/
|
|
rohc_cid_context->mode = (enum rohc_mode)((tvb_get_guint8(tvb,offset) & 0x30)>>4);
|
|
proto_tree_add_item(rohc_feedback_tree, hf_rohc_acktype, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(rohc_feedback_tree, hf_rohc_mode, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
sn = tvb_get_ntohs(tvb, offset) & 0x0fff;
|
|
proto_tree_add_item(rohc_feedback_tree, hf_rohc_sn, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset+=2;
|
|
feedback_data_len-=2;
|
|
|
|
while(feedback_data_len>0){
|
|
opt = opt_len = tvb_get_guint8(tvb,offset);
|
|
opt = opt >> 4;
|
|
opt_len = opt_len &0x0f;
|
|
ti = proto_tree_add_item(rohc_feedback_tree, hf_rohc_opt_type, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(rohc_feedback_tree, hf_rohc_opt_len, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
feedback_data_len--;
|
|
switch(opt){
|
|
case 1:
|
|
/* CRC */
|
|
proto_tree_add_item(rohc_feedback_tree, hf_rohc_crc, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
oct = tvb_get_guint8(tvb, offset);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, "CRC=%u ", oct);
|
|
break;
|
|
case 2:
|
|
/* REJECT */
|
|
col_append_str(pinfo->cinfo, COL_INFO, "Reject ");
|
|
break;
|
|
case 3:
|
|
/* SN-Not-Valid */
|
|
col_append_str(pinfo->cinfo, COL_INFO, "SN-Not-Valid ");
|
|
break;
|
|
case 4:
|
|
/* SN */
|
|
proto_tree_add_item(rohc_feedback_tree, hf_rohc_opt_sn, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
sn = (sn << 8) | tvb_get_guint8(tvb, offset);
|
|
ti = proto_tree_add_uint(rohc_feedback_tree, hf_rohc_ext_sn, tvb, 0, 0, sn);
|
|
PROTO_ITEM_SET_GENERATED(ti);
|
|
break;
|
|
case 5:
|
|
/* Clock */
|
|
if (rohc_cid_context->profile == ROHC_PROFILE_RTP) {
|
|
proto_tree_add_item(rohc_feedback_tree, hf_rohc_opt_clock, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
oct = tvb_get_guint8(tvb, offset);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, "Clock=%u ", oct);
|
|
} else {
|
|
expert_add_info(pinfo, ti, &ei_rohc_rohc_opt_clock);
|
|
}
|
|
break;
|
|
case 6:
|
|
/* Jitter */
|
|
if (rohc_cid_context->profile == ROHC_PROFILE_RTP) {
|
|
proto_tree_add_item(rohc_feedback_tree, hf_rohc_opt_jitter, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
oct = tvb_get_guint8(tvb, offset);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, "Jitter=%u ", oct);
|
|
}else {
|
|
expert_add_info(pinfo, ti, &ei_rohc_opt_jitter);
|
|
}
|
|
break;
|
|
case 7:
|
|
/* Loss */
|
|
proto_tree_add_item(rohc_feedback_tree, hf_rohc_opt_loss, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
oct = tvb_get_guint8(tvb, offset);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, "Loss=%u ", oct);
|
|
break;
|
|
default:
|
|
proto_tree_add_text(rohc_feedback_tree, tvb, offset, opt_len, "Unknown Option data");
|
|
break;
|
|
}
|
|
feedback_data_len = feedback_data_len - opt_len;
|
|
offset = offset + opt_len;
|
|
|
|
}
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", sn);
|
|
break;
|
|
default:
|
|
ti = proto_tree_add_text(tree, tvb, offset, feedback_data_len, "profile-specific information[Not dissected yet]");
|
|
rohc_feedback_tree = proto_item_add_subtree(ti, ett_rohc_feedback);
|
|
proto_tree_add_item(rohc_feedback_tree, hf_rohc_acktype, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
const true_false_string rohc_cmp_lst_mask_size_vals = { "15-bit mask", "7-bit mask" };
|
|
|
|
|
|
/* 5.8.6. Compressed list formats */
|
|
static int
|
|
dissect_compressed_list(int expected_encoding_type _U_, packet_info *pinfo _U_,
|
|
proto_tree *tree, tvbuff_t *tvb, int offset)
|
|
{
|
|
proto_item *list_ti /* , *et_ti */;
|
|
proto_item *list_tree;
|
|
guint8 first_byte = tvb_get_guint8(tvb, offset);
|
|
guint8 ET, GP , PS, CC , bit_mask_size;
|
|
int start_offset = offset;
|
|
|
|
/* Compressed list root */
|
|
list_ti = proto_tree_add_item(tree, hf_rohc_compressed_list, tvb, offset, -1, ENC_NA);
|
|
list_tree = proto_item_add_subtree(list_ti, ett_rohc_compressed_list);
|
|
|
|
/* Fixed fields from first byte */
|
|
ET = (first_byte & 0xc0) >> 6;
|
|
/* et_ti = proto_tree_add_item(list_tree, hf_rohc_compressed_list_et, tvb, offset, 1, ENC_BIG_ENDIAN); */
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_et, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_item_append_text(list_ti, " (type=%d - %s)",
|
|
ET, val_to_str_const(ET, compressed_list_encoding_type_vals, "Unknown"));
|
|
#if 0
|
|
if (ET != expected_encoding_type) {
|
|
expert_add_info_format(pinfo, et_ti, PI_MALFORMED, PI_ERROR,
|
|
"Wrong compressed list encoding type (expected %d, got %d)",
|
|
expected_encoding_type, ET);
|
|
return offset+1;
|
|
}
|
|
#endif
|
|
GP = (first_byte & 0x20) >> 5;
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_gp, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
switch (ET) {
|
|
case 0:
|
|
/* 5.8.6.1 Encoding Type 0 (generic scheme)
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | ET=0 |GP |PS | CC = m |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* : gen_id : 1 octet, if GP = 1
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | XI 1, ..., XI m | m octets, or m * 4 bits
|
|
* / --- --- --- ---/
|
|
* | : Padding : if PS = 0 and m is odd
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | |
|
|
* / item 1, ..., item n / variable
|
|
* | |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*
|
|
*/
|
|
/* PS = (first_byte & 0x10) >> 4;
|
|
* PS: Indicates size of XI fields:
|
|
* PS = 0 indicates 4-bit XI fields;
|
|
* PS = 1 indicates 8-bit XI fields.
|
|
*/
|
|
PS = (first_byte & 0x10) >> 4;
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_ps, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
/* CC: CSRC counter from original RTP header. */
|
|
CC = first_byte & 0x0f;
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_cc, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
|
|
/* GP: Indicates presence of gen_id field. */
|
|
if (GP) {
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_gen_id, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
if(CC!=0){
|
|
/* TODO: calculate how many bytes to skip for items */
|
|
/*
|
|
* XI 1, ..., XI m: m XI items. The format of an XI item is as
|
|
* follows:
|
|
*
|
|
* +---+---+---+---+
|
|
* PS = 0: | X | Index |
|
|
* +---+---+---+---+
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* PS = 1: | X | Index |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*
|
|
* X = 1 indicates that the item corresponding to the Index
|
|
* is sent in the item 0, ..., item n list.
|
|
* X = 0 indicates that the item corresponding to the Index is
|
|
* not sent.
|
|
*/
|
|
if(PS){
|
|
/* PS = 1 indicates 8-bit XI fields. */
|
|
}else{
|
|
/* PS = 0 indicates 4-bit XI fields; */
|
|
}
|
|
}
|
|
|
|
break;
|
|
|
|
case 1:
|
|
/*
|
|
* 5.8.6.2. Encoding Type 1 (insertion only scheme)
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | ET=1 |GP |PS | XI 1 |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* : gen_id : 1 octet, if GP = 1
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | ref_id |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / insertion bit mask / 1-2 octets
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | XI list | k octets, or (k - 1) * 4 bits
|
|
* / --- --- --- ---/
|
|
* | : Padding : if PS = 0 and k is even
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | |
|
|
* / item 1, ..., item n / variable
|
|
* | |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*
|
|
*/
|
|
PS = (first_byte & 0x10) >> 4;
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_ps, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
/* XI 1: When PS = 0, the first 4-bit XI item is placed here.
|
|
* When PS = 1, the field is set to zero when sending, and
|
|
* ignored when receiving.
|
|
*/
|
|
if(PS==0){
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_xi_1, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
offset++;
|
|
/* GP: Indicates presence of gen_id field. */
|
|
if (GP) {
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_gen_id, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_ref_id, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
/*
|
|
* insertion bit mask: Bit mask indicating the positions where new
|
|
* items are to be inserted. See Insertion Only scheme in
|
|
* section 5.8.3. The bit mask can have either of the
|
|
* following two formats:
|
|
*
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 0 | 7-bit mask | bit 1 is the first bit
|
|
* +---+---+---+---+---+---+---+---+
|
|
*
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 | | bit 1 is the first bit
|
|
* +---+ 15-bit mask +
|
|
* | | bit 7 is the last bit
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
bit_mask_size = (tvb_get_guint8(tvb,offset)&0x80)>>7;
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_mask_size, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
if(bit_mask_size){
|
|
proto_tree_add_bits_item(list_tree, hf_rohc_compressed_list_ins_bit_mask, tvb, (offset<<3)+1, 15, ENC_BIG_ENDIAN);
|
|
offset+=2;
|
|
}else{
|
|
proto_tree_add_bits_item(list_tree, hf_rohc_compressed_list_ins_bit_mask, tvb, (offset<<3)+1, 7, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
|
|
/*
|
|
* XI list: XI fields for items to be inserted. When the insertion
|
|
* bit mask has k ones, the total number of XI fields is k. When
|
|
* PS = 1, all XI fields are in the XI list. When PS = 0, the
|
|
* first XI field is in the XI 1 field, and the remaining k - 1
|
|
* XI fields are in the XI list.
|
|
*
|
|
* Padding: Present when PS = 0 and k is even.
|
|
*/
|
|
/* TODO: */
|
|
break;
|
|
case 2:
|
|
/*
|
|
* 5.8.6.3. Encoding Type 2 (removal only scheme)
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | ET=2 |GP |res| Count |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* : gen_id : 1 octet, if GP = 1
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | ref_id |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / removal bit mask / 1-2 octets
|
|
* +---+---+---+---+---+---+---+---+
|
|
*
|
|
*/
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_res, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
/* Count: Number of elements in ref_list. */
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_count, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
/* GP: Indicates presence of gen_id field. */
|
|
if (GP) {
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_gen_id, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_ref_id, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
/*
|
|
* removal bit mask: Indicates the elements in ref_list to be
|
|
* removed in order to obtain the current list. See section
|
|
* 5.8.3. The removal bit mask has the same format as the
|
|
* insertion bit mask of section 5.8.6.3.
|
|
*/
|
|
|
|
bit_mask_size = (tvb_get_guint8(tvb,offset)&0x80)>>7;
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_mask_size, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
if(bit_mask_size){
|
|
proto_tree_add_bits_item(list_tree, hf_rohc_compressed_list_rem_bit_mask, tvb, (offset<<3)+1, 15, ENC_BIG_ENDIAN);
|
|
offset+=2;
|
|
}else{
|
|
proto_tree_add_bits_item(list_tree, hf_rohc_compressed_list_rem_bit_mask, tvb, (offset<<3)+1, 7, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
break;
|
|
case 3:
|
|
/*
|
|
* 5.8.6.4. Encoding Type 3 (remove then insert scheme)
|
|
*
|
|
* See section 5.8.3 for a description of the Remove then insert
|
|
* scheme.
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | ET=3 |GP |PS | XI 1 |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* : gen_id : 1 octet, if GP = 1
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | ref_id |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / removal bit mask / 1-2 octets
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / insertion bit mask / 1-2 octets
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | XI list | k octets, or (k - 1) * 4 bits
|
|
* / --- --- --- ---/
|
|
* | : Padding : if PS = 0 and k is even
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | |
|
|
* / item 1, ..., item n / variable
|
|
* | |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*
|
|
*/
|
|
PS = (first_byte & 0x10) >> 4;
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_ps, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
/* XI 1: When PS = 0, the first 4-bit XI item is placed here.
|
|
* When PS = 1, the field is set to zero when sending, and
|
|
* ignored when receiving.
|
|
*/
|
|
if(PS==0){
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_xi_1, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
offset++;
|
|
/* GP: Indicates presence of gen_id field. */
|
|
if (GP) {
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_gen_id, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_ref_id, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
|
|
/*
|
|
* removal bit mask: Indicates the elements in ref_list to be
|
|
* removed in order to obtain the current list. See section
|
|
* 5.8.3. The removal bit mask has the same format as the
|
|
* insertion bit mask of section 5.8.6.3.
|
|
*/
|
|
|
|
bit_mask_size = (tvb_get_guint8(tvb,offset)&0x80)>>7;
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_mask_size, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
if(bit_mask_size){
|
|
proto_tree_add_bits_item(list_tree, hf_rohc_compressed_list_rem_bit_mask, tvb, (offset<<3)+1, 15, ENC_BIG_ENDIAN);
|
|
offset+=2;
|
|
}else{
|
|
proto_tree_add_bits_item(list_tree, hf_rohc_compressed_list_rem_bit_mask, tvb, (offset<<3)+1, 7, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
|
|
/*
|
|
* insertion bit mask: Bit mask indicating the positions where new
|
|
* items are to be inserted. See Insertion Only scheme in
|
|
* section 5.8.3. The bit mask can have either of the
|
|
* following two formats:
|
|
*
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 0 | 7-bit mask | bit 1 is the first bit
|
|
* +---+---+---+---+---+---+---+---+
|
|
*
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | 1 | | bit 1 is the first bit
|
|
* +---+ 15-bit mask +
|
|
* | | bit 7 is the last bit
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
bit_mask_size = (tvb_get_guint8(tvb,offset)&0x80)>>7;
|
|
proto_tree_add_item(list_tree, hf_rohc_compressed_list_mask_size, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
if(bit_mask_size){
|
|
proto_tree_add_bits_item(list_tree, hf_rohc_compressed_list_ins_bit_mask, tvb, (offset<<3)+1, 15, ENC_BIG_ENDIAN);
|
|
offset+=2;
|
|
}else{
|
|
proto_tree_add_bits_item(list_tree, hf_rohc_compressed_list_ins_bit_mask, tvb, (offset<<3)+1, 7, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
/* TODO: */
|
|
offset++;
|
|
break;
|
|
}
|
|
|
|
proto_item_set_len(list_ti, offset-start_offset);
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int
|
|
dissect_rohc_ir_rtp_profile_dynamic(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
int offset, guint8 profile, rohc_cid_context_t *rohc_cid_context){
|
|
|
|
proto_item *item, *root_ti;
|
|
proto_tree *sub_tree = NULL, *dynamic_ipv4_tree, *dynamic_udp_tree, *dynamic_rtp_tree;
|
|
guint8 oct, rx, /* cc, */ val_len = 0;
|
|
int start_offset, tree_start_offset;
|
|
guint8 tos, ttl, nbo;
|
|
guint16 id;
|
|
/*guint8 contributing_csrcs;*/
|
|
guint16 sequence_number;
|
|
guint32 timestamp;
|
|
#if 0
|
|
guint8 tis = 0, tss=0;
|
|
guint64 ts_stride = 0;
|
|
#endif
|
|
start_offset = offset;
|
|
switch(profile){
|
|
|
|
case ROHC_PROFILE_UNCOMPRESSED:
|
|
item = proto_tree_add_text(tree, tvb, offset, 0, "Profile 0x0000 Uncompressed");
|
|
break;
|
|
|
|
case ROHC_PROFILE_RTP:
|
|
item = proto_tree_add_text(tree, tvb, offset, 0, "Profile 0x0001 RTP Dynamic Chain");
|
|
break;
|
|
|
|
case ROHC_PROFILE_UDP:
|
|
item = proto_tree_add_text(tree, tvb, offset, 0, "Profile 0x0002 UDP Dynamic Chain");
|
|
break;
|
|
|
|
case ROHC_PROFILE_IP:
|
|
item = proto_tree_add_text(tree, tvb, offset, 0, "Profile 0x0004 IP Dynamic Chain");
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_text(tree, tvb, offset, 0, "Profile not supported");
|
|
return -1;
|
|
}
|
|
|
|
/* IP dynamic*/
|
|
/* for all profiles except uncompressed */
|
|
if ( (profile != ROHC_PROFILE_UNCOMPRESSED) ) {
|
|
sub_tree = proto_item_add_subtree(item, ett_rohc_rtp_dynamic);
|
|
switch(rohc_cid_context->rohc_ip_version){
|
|
case 4:
|
|
/* 5.7.7.4. Initialization of IPv4 Header [IPv4, section 3.1].
|
|
* Dynamic part:
|
|
*/
|
|
/* Create dynamic IPv4 subtree */
|
|
tree_start_offset = offset;
|
|
root_ti = proto_tree_add_item(sub_tree, hf_rohc_dynamic_ipv4, tvb, offset, -1, ENC_NA);
|
|
dynamic_ipv4_tree = proto_item_add_subtree(root_ti, ett_rohc_dynamic_ipv4);
|
|
|
|
/* Type of Service */
|
|
tos = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(dynamic_ipv4_tree, hf_rohc_rtp_tos, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
/* Time to Live */
|
|
ttl = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(dynamic_ipv4_tree, hf_rohc_rtp_ttl, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
/* Identification */
|
|
id = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_item(dynamic_ipv4_tree, hf_rohc_rtp_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset+=2;
|
|
/* +---+---+---+---+---+---+---+---+
|
|
* | DF|RND|NBO| 0 |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
rohc_cid_context->rnd = (tvb_get_guint8(tvb, offset) & 0x40) >> 6;
|
|
nbo = (tvb_get_guint8(tvb, offset) & 0x20) >> 5;
|
|
proto_tree_add_item(dynamic_ipv4_tree, hf_rohc_rtp_df, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(dynamic_ipv4_tree, hf_rohc_rtp_rnd, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(dynamic_ipv4_tree, hf_rohc_rtp_nbo, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(dynamic_ipv4_tree, hf_rohc_spare_bits, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
/* Set proper length for subtree */
|
|
proto_item_set_len(root_ti, offset-tree_start_offset);
|
|
|
|
/* +---+---+---+---+---+---+---+---+
|
|
* / Generic extension header list / variable length
|
|
* +---+---+---+---+---+---+---+---+
|
|
* Generic extension header list: Encoded according to section
|
|
* 5.8.6.1, with all header items present in uncompressed form.
|
|
*/
|
|
offset = dissect_compressed_list(0, pinfo, dynamic_ipv4_tree, tvb, offset);
|
|
|
|
/* Add summary to ipv4 root item */
|
|
proto_item_append_text(root_ti, " (ToS=%u, TTL=%u, ID=%u, RND=%u, NBO=%u)",
|
|
tos, ttl, id, rohc_cid_context->rnd, nbo);
|
|
|
|
break;
|
|
case 6:
|
|
|
|
/* Dynamic part:
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | Traffic Class | 1 octet
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | Hop Limit | 1 octet
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / Generic extension header list / variable length
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
proto_tree_add_item(sub_tree, hf_rohc_ipv6_tc, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
proto_tree_add_item(sub_tree, hf_rohc_ipv6_hop_limit, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
/* XXX TODO: use the IPv6 dissector to dissect Generic extension header list ?*/
|
|
proto_tree_add_text(sub_tree, tvb, offset, -1, "Not dissected yet");
|
|
return -1;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* UDP dynamic*/
|
|
if ( (profile == ROHC_PROFILE_UDP) ||
|
|
(profile == ROHC_PROFILE_RTP) ) {
|
|
/* 5.7.7.5. Initialization of UDP Header
|
|
* Dynamic part:
|
|
*
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / Checksum / 2 octets
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
/* Create dynamic UDP subtree */
|
|
root_ti = proto_tree_add_item(sub_tree, hf_rohc_dynamic_udp, tvb, offset, 2, ENC_NA);
|
|
dynamic_udp_tree = proto_item_add_subtree(root_ti, ett_rohc_dynamic_udp);
|
|
id = tvb_get_ntohs(tvb, offset);
|
|
rohc_cid_context->udp_checksum_present = id ? TRUE : FALSE;
|
|
proto_tree_add_item(dynamic_udp_tree, hf_rohc_dynamic_udp_checksum, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset +=2;
|
|
proto_item_set_len(item, offset - start_offset);
|
|
}
|
|
|
|
/* RTP dynamic*/
|
|
if (profile == ROHC_PROFILE_RTP) {
|
|
/* 5.7.7.6. Initialization of RTP Header
|
|
* Dynamic part:
|
|
* Checksum
|
|
* P, X, CC, PT, M, sequence number, timestamp, timestamp stride,
|
|
* CSRC identifiers.
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | V=2 | P | RX| CC | (RX is NOT the RTP X bit)
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | M | PT |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / RTP Sequence Number / 2 octets
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / RTP Timestamp (absolute) / 4 octets
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / Generic CSRC list / variable length
|
|
* +---+---+---+---+---+---+---+---+
|
|
* : Reserved | X | Mode |TIS|TSS: if RX = 1
|
|
* +---+---+---+---+---+---+---+---+
|
|
* : TS_Stride : 1-4 octets, if TSS = 1
|
|
* +---+---+---+---+---+---+---+---+
|
|
* : Time_Stride : 1-4 octets, if TIS = 1
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
|
|
/* Create dynamic RTP subtree */
|
|
root_ti = proto_tree_add_item(sub_tree, hf_rohc_dynamic_rtp, tvb, offset, -1, ENC_NA);
|
|
dynamic_rtp_tree = proto_item_add_subtree(root_ti, ett_rohc_dynamic_rtp);
|
|
|
|
tree_start_offset = offset;
|
|
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_v, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_p, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_rx, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_cc, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
oct = tvb_get_guint8(tvb,offset);
|
|
/* cc = oct & 0x0f; */
|
|
rx = (oct >> 4)& 0x01;
|
|
offset++;
|
|
proto_tree_add_bits_item(dynamic_rtp_tree, hf_rohc_rtp_m, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_pt, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
sequence_number = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_sn, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset+=2;
|
|
timestamp = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_timestamp, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset+=4;
|
|
/* RFC 4815
|
|
* This field is always at least one octet in size, even if the
|
|
* list is empty (as opposed to the CSRC list in the uncompressed RTP
|
|
* header, which is not present when the RTP CC field is set to 0).
|
|
* :
|
|
* Generic CSRC list: CSRC list encoded according to section
|
|
* 5.8.6.1, with all CSRC items present.
|
|
* FORMAL ADDITION TO RFC 3095:
|
|
*
|
|
* "The first octet in the dynamic part of the RTP header contains a
|
|
* CC field, as defined in Section 5.7.7.6. A second occurrence
|
|
* appears in the 'Generic CSRC list', which is also in the dynamic
|
|
* part of the RTP header, where Encoding Type 0 is used according
|
|
* to the format defined in RFC 3095-5.8.6.1.
|
|
*
|
|
* The compressor MUST set both occurrences of the CC field to the
|
|
* same value.
|
|
*
|
|
* The decompressor MUST use the value of the CC field from the
|
|
* Encoding Type 0 within the Generic CRSC list, and it MUST thus
|
|
* ignore the first occurrence of the CC field."
|
|
*/
|
|
|
|
offset = dissect_compressed_list(0, pinfo, dynamic_rtp_tree, tvb, offset);
|
|
/* : Reserved | X | Mode |TIS|TSS: if RX = 1 */
|
|
if(rx==0){
|
|
return offset;
|
|
}
|
|
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_x, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
rohc_cid_context->mode = (enum rohc_mode)((tvb_get_guint8(tvb,offset) & 0x0c)>>2);
|
|
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_mode, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_tis, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_tss, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
oct = tvb_get_guint8(tvb,offset);
|
|
offset++;
|
|
/* TS_Stride : 1-4 octets, if TSS = 1 */
|
|
if((oct&0x01)== 1){
|
|
/* TS_Stride encoded as
|
|
* 4.5.6. Self-describing variable-length values
|
|
*/
|
|
get_self_describing_var_len_val(tvb, dynamic_rtp_tree, offset, hf_rohc_rtp_ts_stride, &val_len);
|
|
offset = offset + val_len;
|
|
}
|
|
|
|
/* Time_Stride : 1-4 octets, if TIS = 1 */
|
|
if((oct&0x02)== 2){
|
|
/* Time_Stride encoded as
|
|
* 4.5.6. Self-describing variable-length values
|
|
*/
|
|
get_self_describing_var_len_val(tvb, dynamic_rtp_tree, offset, hf_rohc_rtp_time_stride, &val_len);
|
|
offset = offset + val_len;
|
|
}
|
|
/* Set proper length for subtree */
|
|
proto_item_set_len(root_ti, offset-tree_start_offset);
|
|
|
|
/* Add summary to root item */
|
|
proto_item_append_text(root_ti, " (seqnum = %u, timestamp = %u)",
|
|
sequence_number, timestamp);
|
|
|
|
proto_item_set_len(item, offset - start_offset);
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
static int
|
|
dissect_rohc_ir_rtp_udp_ip_profile_static(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, int offset, gboolean d, guint8 profile, rohc_cid_context_t *rohc_cid_context){
|
|
|
|
proto_item *item, *ipv4_item, *udp_item, *rtp_item;
|
|
proto_tree *sub_tree = NULL, *static_ipv4_tree, *static_udp_tree, *static_rtp_tree;
|
|
guint8 version, protocol;
|
|
int start_offset, tree_start_offset;
|
|
|
|
start_offset = offset;
|
|
switch(profile){
|
|
|
|
case ROHC_PROFILE_UNCOMPRESSED:
|
|
item = proto_tree_add_text(tree, tvb, offset, 0, "Profile 0x0000 Uncompressed");
|
|
break;
|
|
|
|
case ROHC_PROFILE_RTP:
|
|
item = proto_tree_add_text(tree, tvb, offset, 0, "Profile 0x0001 RTP Static Chain");
|
|
break;
|
|
|
|
case ROHC_PROFILE_UDP:
|
|
item = proto_tree_add_text(tree, tvb, offset, 0, "Profile 0x0002 UDP Static Chain");
|
|
break;
|
|
|
|
case ROHC_PROFILE_IP:
|
|
item = proto_tree_add_text(tree, tvb, offset, 0, "Profile 0x0004 IP Static Chain");
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_text(tree, tvb, offset, 0, "Profile not supported");
|
|
return -1;
|
|
}
|
|
|
|
/* IP static*/
|
|
/* for all profiles except uncompressed */
|
|
if (profile != ROHC_PROFILE_UNCOMPRESSED) {
|
|
sub_tree = proto_item_add_subtree(item, ett_rohc_rtp_static);
|
|
version = tvb_get_guint8(tvb,offset)>>4;
|
|
proto_tree_add_item(sub_tree, hf_rohc_ip_version, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
rohc_cid_context->rohc_ip_version = version;
|
|
|
|
switch(version) {
|
|
case 4:
|
|
{
|
|
/* 5.7.7.4. Initialization of IPv4 Header [IPv4, section 3.1].
|
|
* Static part:
|
|
*/
|
|
guint32 source, dest;
|
|
|
|
offset++;
|
|
tree_start_offset = offset;
|
|
/* Create static IPv4 subtree */
|
|
ipv4_item = proto_tree_add_item(sub_tree, hf_rohc_static_ipv4, tvb, offset, -1, ENC_NA);
|
|
static_ipv4_tree = proto_item_add_subtree(ipv4_item, ett_rohc_static_ipv4);
|
|
/* Protocol */
|
|
protocol = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(static_ipv4_tree, hf_rohc_ip_protocol, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
/* Source Address */
|
|
source = tvb_get_ipv4(tvb, offset);
|
|
proto_tree_add_item(static_ipv4_tree, hf_rohc_ipv4_src, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset+=4;
|
|
/* Destination Address */
|
|
dest = tvb_get_ipv4(tvb, offset);
|
|
proto_tree_add_item(static_ipv4_tree, hf_rohc_ipv4_dst, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset+=4;
|
|
/* Set proper length for subtree */
|
|
proto_item_set_len(ipv4_item, offset-tree_start_offset);
|
|
|
|
/* Add summary to root item */
|
|
proto_item_append_text(ipv4_item, " (prot=%s: %s -> %s)",
|
|
val_to_str_ext_const(protocol, &ipproto_val_ext, "Unknown"),
|
|
get_hostname(source),
|
|
get_hostname(dest));
|
|
}
|
|
break;
|
|
case 6:
|
|
{
|
|
/* 5.7.7.3. Initialization of IPv6 Header [IPv6]*/
|
|
/* Static part:
|
|
*
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | Version = 6 |Flow Label(msb)| 1 octet
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / Flow Label (lsb) / 2 octets
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | Next Header | 1 octet
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / Source Address / 16 octets
|
|
* +---+---+---+---+---+---+---+---+
|
|
* / Destination Address / 16 octets
|
|
* +---+---+---+---+---+---+---+---+
|
|
*/
|
|
|
|
/* Flow Label */
|
|
proto_tree_add_item(sub_tree, hf_rohc_ipv6_flow, tvb, offset, 3, ENC_BIG_ENDIAN);
|
|
offset+=3;
|
|
|
|
/* Next Header */
|
|
protocol = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(sub_tree, hf_rohc_ipv6_nxt_hdr, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
|
|
/* Source Address */
|
|
proto_tree_add_item(sub_tree, hf_rohc_ipv6_src, tvb, offset, 16, ENC_NA);
|
|
offset+=16;
|
|
|
|
/* Destination Address */
|
|
proto_tree_add_item(sub_tree, hf_rohc_ipv6_dst, tvb, offset, 16, ENC_NA);
|
|
offset+=16;
|
|
|
|
break;
|
|
}
|
|
default:
|
|
proto_tree_add_text(sub_tree, tvb, offset, -1, "Error unknown version, only 4 or 6 allowed");
|
|
return -1;
|
|
}
|
|
} else {
|
|
protocol = 0; /* Something other than UDP (which is checked for below) */
|
|
}
|
|
|
|
if (protocol == IP_PROTO_UDP) {
|
|
/* UDP static */
|
|
if ((profile == ROHC_PROFILE_RTP) ||
|
|
(profile == ROHC_PROFILE_UDP)) {
|
|
/* 5.7.7.5. Initialization of UDP Header [RFC-768].
|
|
* Static part
|
|
*/
|
|
guint16 source_port, dest_port, ssrc;
|
|
|
|
/* Create static UDP subtree */
|
|
tree_start_offset = offset;
|
|
udp_item = proto_tree_add_item(sub_tree, hf_rohc_static_udp, tvb, offset, -1, ENC_NA);
|
|
static_udp_tree = proto_item_add_subtree(udp_item, ett_rohc_static_udp);
|
|
/* Source Port */
|
|
source_port = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_item(static_udp_tree, hf_rohc_udp_src_port, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset+=2;
|
|
/* Destination Port */
|
|
dest_port = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_item(static_udp_tree, hf_rohc_udp_dst_port, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset+=2;
|
|
/* Set proper length for subtree */
|
|
proto_item_set_len(udp_item, offset-tree_start_offset);
|
|
/* Add summary to root item */
|
|
proto_item_append_text(udp_item, " (%u -> %u)", source_port, dest_port);
|
|
|
|
if (profile == ROHC_PROFILE_UDP) {
|
|
proto_item_set_len(item, offset - start_offset);
|
|
if (d==TRUE) {
|
|
offset = dissect_rohc_ir_rtp_profile_dynamic(tvb, pinfo, tree, offset, profile, rohc_cid_context);
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
/* RTP static */
|
|
/* 5.7.7.6. Initialization of RTP Header [RTP]. */
|
|
/* Create static RTP subtree */
|
|
rtp_item = proto_tree_add_item(sub_tree, hf_rohc_static_rtp, tvb, offset, 4, ENC_NA);
|
|
static_rtp_tree = proto_item_add_subtree(rtp_item, ett_rohc_static_rtp);
|
|
|
|
/* SSRC */
|
|
ssrc = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_item(static_rtp_tree, hf_rohc_rtp_ssrc, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
|
|
/* Add summary to root item */
|
|
proto_item_append_text(rtp_item, " (SSRC=%u)", ssrc);
|
|
|
|
proto_item_set_len(item, offset - start_offset);
|
|
|
|
/* D: D = 1 indicates that the dynamic chain is present. */
|
|
if (d==TRUE) {
|
|
offset = dissect_rohc_ir_rtp_profile_dynamic(tvb, pinfo, tree, offset, profile, rohc_cid_context);
|
|
}
|
|
}
|
|
} else if (profile == ROHC_PROFILE_IP) {
|
|
proto_item_set_len(item, offset - start_offset);
|
|
if (d==TRUE) {
|
|
offset = dissect_rohc_ir_rtp_profile_dynamic(tvb, pinfo, tree, offset, profile, rohc_cid_context);
|
|
}
|
|
return offset;
|
|
} else {
|
|
proto_tree_add_text(sub_tree, tvb, offset, -1, "[Not dissected yet]");
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
static int
|
|
dissect_rohc_ir_packet(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo,
|
|
int offset, guint16 cid, gboolean is_add_cid, rohc_info *p_rohc_info)
|
|
{
|
|
proto_item *ir_item, *item;
|
|
proto_tree *ir_tree;
|
|
int ir_item_start;
|
|
int x_bit_offset;
|
|
gboolean d = FALSE;
|
|
guint8 oct, profile, val_len = 0;
|
|
gint16 feedback_data_len = 0;
|
|
tvbuff_t *next_tvb;
|
|
rohc_cid_context_t *rohc_cid_context = NULL;
|
|
|
|
/* The cid value must have been dissected and valid
|
|
* offset must point to the IR octet see below ( | 1 1 1 1 1 1 0 | D | )
|
|
* TODO: CRC validation
|
|
*/
|
|
|
|
/*
|
|
0 1 2 3 4 5 6 7
|
|
--- --- --- --- --- --- --- ---
|
|
| Add-CID octet | if for small CIDs and CID != 0
|
|
+---+---+---+---+---+---+---+---+
|
|
| 1 1 1 1 1 1 0 | D |
|
|
+---+---+---+---+---+---+---+---+
|
|
| |
|
|
/ 0-2 octets of CID info / 1-2 octets if for large CIDs
|
|
| |
|
|
+---+---+---+---+---+---+---+---+
|
|
| Profile | 1 octet
|
|
+---+---+---+---+---+---+---+---+
|
|
| CRC | 1 octet
|
|
+---+---+---+---+---+---+---+---+
|
|
| |
|
|
| Static chain | variable length
|
|
| |
|
|
+---+---+---+---+---+---+---+---+
|
|
| |
|
|
| Dynamic chain | present if D = 1, variable length
|
|
| |
|
|
- - - - - - - - - - - - - - - -
|
|
| |
|
|
| Payload | variable length
|
|
| |
|
|
- - - - - - - - - - - - - - - -
|
|
|
|
*/
|
|
oct = tvb_get_guint8(tvb,offset);
|
|
|
|
if((p_rohc_info->large_cid_present == FALSE) && (is_add_cid == FALSE)){
|
|
item = proto_tree_add_uint(tree, hf_rohc_small_cid, tvb, 0, 0, cid);
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
}
|
|
ir_item = proto_tree_add_item(tree, hf_rohc_ir_packet, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
ir_tree = proto_item_add_subtree(ir_item, ett_rohc_ir);
|
|
ir_item_start = offset;
|
|
d = oct & 0x01;
|
|
x_bit_offset = offset;
|
|
offset++;
|
|
if(p_rohc_info->large_cid_present == TRUE){
|
|
/* Handle Large CID:s here */
|
|
get_self_describing_var_len_val(tvb, ir_tree, offset, hf_rohc_large_cid, &val_len);
|
|
offset = offset + val_len;
|
|
}
|
|
|
|
/* Read profile */
|
|
profile = tvb_get_guint8(tvb,offset);
|
|
|
|
if(profile==ROHC_PROFILE_RTP){
|
|
proto_tree_add_item(ir_tree, hf_rohc_d_bit, tvb, x_bit_offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
proto_tree_add_item(ir_tree, hf_rohc_profile, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
|
|
proto_tree_add_item(ir_tree, hf_rohc_crc, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
|
|
/* See if we have an entry for this CID
|
|
* Update it if we do otherwise create it
|
|
* and fill in the info.
|
|
*/
|
|
if (!pinfo->fd->flags.visited){
|
|
gint key = cid;
|
|
rohc_cid_context = (rohc_cid_context_t*)g_hash_table_lookup(rohc_cid_hash, GUINT_TO_POINTER(key));
|
|
if (rohc_cid_context != NULL){
|
|
/* This is not the first IR packet seen*/
|
|
gint tmp_prev_ir_frame_number = rohc_cid_context->ir_frame_number;
|
|
gint tmp_prev_rohc_ip_version = rohc_cid_context->rohc_ip_version;
|
|
gint tmp_prev_mode = rohc_cid_context->mode;
|
|
gboolean tmp_prev_rnd = rohc_cid_context->rnd;
|
|
gboolean tmp_prev_udp_checksum_present = rohc_cid_context->udp_checksum_present;
|
|
|
|
/*g_warning("IR pkt found CID %u",cid);*/
|
|
|
|
rohc_cid_context = wmem_new(wmem_file_scope(), rohc_cid_context_t);
|
|
rohc_cid_context->profile = profile;
|
|
rohc_cid_context->prev_ir_frame_number = tmp_prev_ir_frame_number;
|
|
rohc_cid_context->ir_frame_number = pinfo->fd->num;
|
|
rohc_cid_context->rohc_ip_version = tmp_prev_rohc_ip_version;
|
|
rohc_cid_context->mode = (enum rohc_mode)tmp_prev_mode;
|
|
rohc_cid_context->rnd = tmp_prev_rnd;
|
|
rohc_cid_context->udp_checksum_present = tmp_prev_udp_checksum_present;
|
|
rohc_cid_context->large_cid_present = p_rohc_info->large_cid_present;
|
|
|
|
g_hash_table_replace(rohc_cid_hash, GUINT_TO_POINTER(key), rohc_cid_context);
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0, rohc_cid_context);
|
|
}else{
|
|
rohc_cid_context = wmem_new(wmem_file_scope(), rohc_cid_context_t);
|
|
rohc_cid_context->large_cid_present = p_rohc_info->large_cid_present;
|
|
/*rohc_cid_context->mode mode;*/
|
|
/*rohc_cid_context->d_mode;*/
|
|
rohc_cid_context->rnd = FALSE;
|
|
rohc_cid_context->udp_checksum_present = FALSE;
|
|
rohc_cid_context->profile = profile;
|
|
rohc_cid_context->prev_ir_frame_number = -1;
|
|
rohc_cid_context->ir_frame_number = pinfo->fd->num;
|
|
rohc_cid_context->rohc_ip_version = p_rohc_info->rohc_ip_version;
|
|
rohc_cid_context->mode = p_rohc_info->mode;
|
|
|
|
/*g_warning("IR pkt New CID %u",cid);*/
|
|
|
|
g_hash_table_insert(rohc_cid_hash, GUINT_TO_POINTER(key), rohc_cid_context);
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0, rohc_cid_context);
|
|
}
|
|
}else{
|
|
/* get the stored data */
|
|
rohc_cid_context = (rohc_cid_context_t*)p_get_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0);
|
|
}
|
|
|
|
switch(profile){
|
|
case ROHC_PROFILE_UNCOMPRESSED:
|
|
if (tvb_length_remaining(tvb, offset) > 0) {
|
|
oct = tvb_get_guint8(tvb, offset);
|
|
if ( (oct&0xf0) == 0x60 ) {
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
call_dissector(ipv6_handle, next_tvb, pinfo, tree);
|
|
offset += tvb_length_remaining(tvb, offset);
|
|
}
|
|
else if ( (oct&0xf0) == 0x40 ) {
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
call_dissector(ip_handle, next_tvb, pinfo, tree);
|
|
offset += tvb_length_remaining(tvb, offset);
|
|
}
|
|
col_prepend_fstr(pinfo->cinfo, COL_PROTOCOL, "ROHC <");
|
|
col_append_str(pinfo->cinfo, COL_PROTOCOL, ">");
|
|
}
|
|
break;
|
|
case ROHC_PROFILE_RTP:
|
|
case ROHC_PROFILE_UDP:
|
|
case ROHC_PROFILE_IP:
|
|
offset = dissect_rohc_ir_rtp_udp_ip_profile_static(tvb, ir_tree, pinfo, offset, d, profile, rohc_cid_context);
|
|
break;
|
|
default:
|
|
proto_tree_add_text(ir_tree, tvb, offset, feedback_data_len, "profile-specific information[Not dissected yet]");
|
|
offset = -1;
|
|
break;
|
|
}
|
|
|
|
if (offset != -1) {
|
|
/* Set length of IR header */
|
|
proto_item_set_len(ir_item, offset-ir_item_start);
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int
|
|
dissect_rohc_ir_dyn_packet(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo,
|
|
int offset, guint16 cid, gboolean is_add_cid, rohc_info *p_rohc_info)
|
|
{
|
|
proto_item *ir_item, *item;
|
|
proto_tree *ir_tree;
|
|
gint ir_item_start;
|
|
guint8 profile, val_len = 0;
|
|
gint16 feedback_data_len = 0;
|
|
rohc_cid_context_t *rohc_cid_context;
|
|
|
|
if((p_rohc_info->large_cid_present == FALSE) && (is_add_cid == FALSE)){
|
|
item = proto_tree_add_uint(tree, hf_rohc_small_cid, tvb, 0, 0, cid);
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
}
|
|
|
|
ir_item = proto_tree_add_item(tree, hf_rohc_ir_dyn_packet, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
ir_tree = proto_item_add_subtree(ir_item, ett_rohc_ir_dyn);
|
|
ir_item_start = offset;
|
|
offset++;
|
|
|
|
if(p_rohc_info->large_cid_present == TRUE){
|
|
/* Handle Large CID:s here */
|
|
get_self_describing_var_len_val(tvb, ir_tree, offset, hf_rohc_large_cid, &val_len);
|
|
offset = offset + val_len;
|
|
}
|
|
|
|
profile = tvb_get_guint8(tvb,offset);
|
|
proto_tree_add_item(ir_tree, hf_rohc_profile, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
|
|
/* See if we have an entry for this CID
|
|
* Update it if we do otherwise create it
|
|
* and fill in the info.
|
|
*/
|
|
if (!pinfo->fd->flags.visited){
|
|
gint key = cid;
|
|
rohc_cid_context = (rohc_cid_context_t*)g_hash_table_lookup(rohc_cid_hash, GUINT_TO_POINTER(key));
|
|
|
|
if (rohc_cid_context){
|
|
/* This is not the first IR packet seen*/
|
|
gint tmp_prev_ir_frame_number = rohc_cid_context->ir_frame_number;
|
|
gint tmp_prev_rohc_ip_version = rohc_cid_context->rohc_ip_version;
|
|
gint tmp_prev_mode = rohc_cid_context->mode;
|
|
gboolean tmp_prev_rnd = rohc_cid_context->rnd;
|
|
gboolean tmp_prev_udp_checksum_present = rohc_cid_context->udp_checksum_present;
|
|
|
|
/*g_warning("IR pkt found CID %u",cid);*/
|
|
|
|
rohc_cid_context = wmem_new(wmem_file_scope(), rohc_cid_context_t);
|
|
rohc_cid_context->profile = profile;
|
|
rohc_cid_context->prev_ir_frame_number = tmp_prev_ir_frame_number;
|
|
rohc_cid_context->ir_frame_number = pinfo->fd->num;
|
|
rohc_cid_context->rohc_ip_version = tmp_prev_rohc_ip_version;
|
|
rohc_cid_context->mode = (enum rohc_mode)tmp_prev_mode;
|
|
rohc_cid_context->rnd = tmp_prev_rnd;
|
|
rohc_cid_context->udp_checksum_present = tmp_prev_udp_checksum_present;
|
|
rohc_cid_context->large_cid_present = p_rohc_info->large_cid_present;
|
|
|
|
g_hash_table_replace(rohc_cid_hash, GUINT_TO_POINTER(key), rohc_cid_context);
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0, rohc_cid_context);
|
|
}else{
|
|
rohc_cid_context = wmem_new(wmem_file_scope(), rohc_cid_context_t);
|
|
/*rohc_cid_context->rohc_ip_version;*/
|
|
rohc_cid_context->large_cid_present = p_rohc_info->large_cid_present;
|
|
/*rohc_cid_context->mode mode;*/
|
|
/*rohc_cid_context->d_mode;*/
|
|
rohc_cid_context->rnd = FALSE;
|
|
rohc_cid_context->udp_checksum_present = FALSE;
|
|
rohc_cid_context->profile = profile;
|
|
rohc_cid_context->prev_ir_frame_number = -1;
|
|
rohc_cid_context->ir_frame_number = pinfo->fd->num;
|
|
rohc_cid_context->mode = p_rohc_info->mode;
|
|
|
|
/*g_warning("IR pkt New CID %u",cid);*/
|
|
|
|
g_hash_table_insert(rohc_cid_hash, GUINT_TO_POINTER(key), rohc_cid_context);
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0, rohc_cid_context);
|
|
}
|
|
}else{
|
|
/* get the stored data */
|
|
rohc_cid_context = (rohc_cid_context_t*)p_get_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0);
|
|
}
|
|
|
|
proto_tree_add_item(ir_tree, hf_rohc_crc, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
|
|
switch(profile){
|
|
case ROHC_PROFILE_RTP:
|
|
offset = dissect_rohc_ir_rtp_profile_dynamic(tvb, pinfo, ir_tree, offset, profile, rohc_cid_context);
|
|
break;
|
|
default:
|
|
proto_tree_add_text(ir_tree, tvb, offset, feedback_data_len, "profile-specific information[Not dissected yet]");
|
|
break;
|
|
}
|
|
|
|
/* Set length of IR-DYN header */
|
|
proto_item_set_len(ir_item, offset-ir_item_start);
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int
|
|
dissect_rohc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
|
|
{
|
|
proto_item *ti, *item, *conf_item;
|
|
proto_tree *rohc_tree, *sub_tree = NULL, *conf_tree;
|
|
int offset = 0, length;
|
|
guint8 oct, code, size, val_len = 0;
|
|
gint16 feedback_data_len = 0, cid = 0;
|
|
gboolean is_add_cid = FALSE;
|
|
rohc_info *p_rohc_info = NULL;
|
|
rohc_info g_rohc_info;
|
|
tvbuff_t *next_tvb=NULL, *payload_tvb;
|
|
rohc_cid_context_t *rohc_cid_context = NULL;
|
|
|
|
if(data == NULL){
|
|
g_rohc_info.rohc_compression = FALSE;
|
|
g_rohc_info.rohc_ip_version = g_version;
|
|
g_rohc_info.cid_inclusion_info = FALSE;
|
|
g_rohc_info.large_cid_present = FALSE;
|
|
g_rohc_info.mode = RELIABLE_BIDIRECTIONAL;
|
|
g_rohc_info.rnd = FALSE;
|
|
g_rohc_info.udp_checksum_present = FALSE;
|
|
g_rohc_info.profile = g_profile;
|
|
g_rohc_info.last_created_item = NULL;
|
|
p_rohc_info = &g_rohc_info;
|
|
}else{
|
|
p_rohc_info = (rohc_info *)data;
|
|
memset(&g_rohc_info, 0, sizeof(rohc_info));
|
|
}
|
|
|
|
length = tvb_length(tvb);
|
|
|
|
/* If this is ROHC ethertype clear col */
|
|
if ( pinfo->src.type == AT_ETHER ){
|
|
col_set_str(pinfo->cinfo, COL_INFO, "ROHC");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
}else{
|
|
col_append_str(pinfo->cinfo, COL_PROTOCOL, "|ROHC");
|
|
/* Append a space if we add stuff to existing col info */
|
|
col_append_str(pinfo->cinfo, COL_INFO, " ");
|
|
}
|
|
ti = proto_tree_add_item(tree, proto_rohc, tvb, 0, -1, ENC_NA);
|
|
rohc_tree = proto_item_add_subtree(ti, ett_rohc);
|
|
/* 1) If the first octet is a Padding Octet (11100000),
|
|
* strip away all initial Padding Octets and goto next step.
|
|
*/
|
|
|
|
/* Put configuration data into the tree */
|
|
item = proto_tree_add_text(rohc_tree, tvb, offset, 0, "Global Configuration: (%s)", p_rohc_info->large_cid_present ? "Large CID" : "Small CID");
|
|
conf_tree = proto_item_add_subtree(item, ett_rohc_conf);
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
rohc_cid_context = (rohc_cid_context_t*)p_get_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0);
|
|
if(rohc_cid_context){
|
|
/* Do we have info from an IR frame? */
|
|
if(rohc_cid_context->ir_frame_number>0){
|
|
conf_item = proto_tree_add_text(conf_tree, tvb, offset, 0, "Configured by IR packet");
|
|
PROTO_ITEM_SET_GENERATED(conf_item);
|
|
conf_item = proto_tree_add_uint(conf_tree, hf_rohc_ir_pkt_frame, tvb, 0, 0, rohc_cid_context->ir_frame_number);
|
|
PROTO_ITEM_SET_GENERATED(conf_item);
|
|
if(rohc_cid_context->prev_ir_frame_number>0){
|
|
conf_item = proto_tree_add_uint(conf_tree, hf_rohc_ir_previous_frame, tvb, 0, 0, rohc_cid_context->prev_ir_frame_number);
|
|
PROTO_ITEM_SET_GENERATED(conf_item);
|
|
}
|
|
conf_item = proto_tree_add_text(conf_tree, tvb, offset, 0, "Profile:(%s)", val_to_str_const(rohc_cid_context->profile, rohc_profile_vals, "Unknown"));
|
|
PROTO_ITEM_SET_GENERATED(conf_item);
|
|
conf_item = proto_tree_add_text(conf_tree, tvb, offset, 0, "IP version:(%s)", val_to_str_const(rohc_cid_context->rohc_ip_version, rohc_ip_version_vals, "Unknown"));
|
|
PROTO_ITEM_SET_GENERATED(conf_item);
|
|
if(rohc_cid_context->mode == 0){
|
|
conf_item = proto_tree_add_text(conf_tree, tvb, offset, 0, "Mode not known");
|
|
PROTO_ITEM_SET_GENERATED(conf_item);
|
|
}else{
|
|
conf_item = proto_tree_add_text(conf_tree, tvb, offset, 0, "Mode:(%s)", val_to_str_const(rohc_cid_context->mode, rohc_mode_vals, "Unknown"));
|
|
PROTO_ITEM_SET_GENERATED(conf_item);
|
|
}
|
|
|
|
}else{
|
|
conf_item = proto_tree_add_text(conf_tree, tvb, offset, 0, "No configuration info");
|
|
PROTO_ITEM_SET_GENERATED(conf_item);
|
|
}
|
|
}
|
|
|
|
start_over:
|
|
cid = 0;
|
|
oct = tvb_get_guint8(tvb,offset);
|
|
if(oct== 0xe0){
|
|
while(oct == 0xe0){
|
|
offset++;
|
|
oct = tvb_get_guint8(tvb,offset);
|
|
}
|
|
proto_tree_add_item(rohc_tree, hf_rohc_padding, tvb, 0, offset, ENC_NA);
|
|
}
|
|
/* 2) If the first remaining octet starts with 1110, it is an Add-CID octet:
|
|
* remember the Add-CID octet; remove the octet.
|
|
*/
|
|
if((oct&0xf0) == 0xe0){
|
|
is_add_cid = TRUE;
|
|
cid = oct & 0x0f;
|
|
proto_tree_add_item(rohc_tree, hf_rohc_add_cid, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_uint(rohc_tree, hf_rohc_small_cid, tvb, offset, 1, cid);
|
|
offset++;
|
|
|
|
oct = tvb_get_guint8(tvb,offset);
|
|
}
|
|
/* feedback ?
|
|
* Feedback (begins with 11110)
|
|
*/
|
|
if((oct&0xf8) == 0xf0){
|
|
/* 3) If the first remaining octet starts with 11110, and an Add-CID
|
|
* octet was found in step 2), an error has occurred;
|
|
* the header MUST be discarded without further action.
|
|
*/
|
|
|
|
int feedback_start = offset;
|
|
|
|
if(is_add_cid){
|
|
p_rohc_info->last_created_item = proto_tree_add_item(rohc_tree, hf_rohc_feedback, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
col_append_str(pinfo->cinfo, COL_INFO, "Error packet");
|
|
proto_tree_add_text(rohc_tree, tvb, offset, -1, "Error packet");
|
|
return tvb_length(tvb);
|
|
}else{
|
|
col_append_str(pinfo->cinfo, COL_INFO, "Feedback ");
|
|
/* 4) If the first remaining octet starts with 11110, and an Add-CID
|
|
* octet was not found in step 2), this is feedback:
|
|
* find the size of the feedback data, call it s;
|
|
* remove the feedback type octet;
|
|
* remove the Size octet if Code is 0;
|
|
* send feedback data of length s to the same-side associated
|
|
* compressor;
|
|
* if packet exhausted, stop; otherwise goto 2).
|
|
*/
|
|
p_rohc_info->last_created_item = proto_tree_add_item(rohc_tree, hf_rohc_feedback, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
sub_tree = proto_item_add_subtree(p_rohc_info->last_created_item, ett_rohc_fb);
|
|
proto_tree_add_item(sub_tree, hf_rohc_code, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
code = oct&0x7;
|
|
offset++;
|
|
if(code==0){
|
|
size = tvb_get_guint8(tvb,offset);
|
|
proto_tree_add_item(sub_tree, hf_rohc_size, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}else{
|
|
size = code;
|
|
}
|
|
feedback_data_len = size;
|
|
if(p_rohc_info->large_cid_present == FALSE){
|
|
/* Check for Add-CID octet */
|
|
oct = tvb_get_guint8(tvb,offset);
|
|
if((oct&0xf0) == 0xe0){
|
|
cid = oct & 0x0f;
|
|
proto_tree_add_item(sub_tree, hf_rohc_add_cid, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_uint(sub_tree, hf_rohc_small_cid, tvb, offset, 1, cid);
|
|
offset++;
|
|
feedback_data_len--;
|
|
}else{
|
|
item = proto_tree_add_uint(sub_tree, hf_rohc_small_cid, tvb, 0, 0, cid);
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
}
|
|
}else{
|
|
/* Read Large CID here */
|
|
get_self_describing_var_len_val(tvb, sub_tree, offset, hf_rohc_large_cid, &val_len);
|
|
/* feedback_data_len - "length of large CID" */
|
|
feedback_data_len = feedback_data_len - val_len;
|
|
offset += val_len;
|
|
}
|
|
|
|
/* Dissect feedback */
|
|
dissect_rohc_feedback_data(tvb, sub_tree, pinfo, offset, feedback_data_len, p_rohc_info, cid, p_rohc_info != &g_rohc_info);
|
|
offset = offset + size;
|
|
if(offset<length)
|
|
goto start_over;
|
|
|
|
proto_item_set_len(p_rohc_info->last_created_item, offset-feedback_start);
|
|
return tvb_length(tvb);
|
|
}
|
|
}/*feedback */
|
|
/* 5) If the first remaining octet starts with 1111111, this is a segment:
|
|
*
|
|
*/
|
|
if((oct&0xfe) == 0xfe){
|
|
col_append_str(pinfo->cinfo, COL_INFO, "Segment");
|
|
if((p_rohc_info->large_cid_present == FALSE) && (is_add_cid == FALSE)){
|
|
item = proto_tree_add_uint(rohc_tree, hf_rohc_small_cid, tvb, 0, 0, cid);
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
}
|
|
proto_tree_add_text(rohc_tree, tvb, offset, -1, "Segment [Desegmentation not implemented yet]");
|
|
return tvb_length(tvb);
|
|
}
|
|
/* 6) Here, it is known that the rest is forward information (unless the
|
|
* header is damaged).
|
|
*/
|
|
if((oct&0xfe) == 0xfc){
|
|
col_append_str(pinfo->cinfo, COL_INFO, "IR packet");
|
|
offset = dissect_rohc_ir_packet(tvb, rohc_tree, pinfo, offset, cid, is_add_cid, p_rohc_info);
|
|
if(offset == -1){
|
|
/* Could not parse header */
|
|
return tvb_length(tvb);
|
|
}
|
|
/*proto_tree_add_text(rohc_tree, tvb, offset, -1, "Data");*/
|
|
payload_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
call_dissector_only(data_handle, payload_tvb, pinfo, rohc_tree, NULL);
|
|
return tvb_length(tvb);
|
|
}
|
|
if((oct&0xff) == 0xf8){
|
|
col_append_str(pinfo->cinfo, COL_INFO, "IR-DYN packet");
|
|
offset = dissect_rohc_ir_dyn_packet(tvb, rohc_tree, pinfo, offset, cid, is_add_cid, p_rohc_info);
|
|
if(offset == -1){
|
|
/* Could not parse header */
|
|
return tvb_length(tvb);
|
|
}
|
|
/*proto_tree_add_text(rohc_tree, tvb, offset, -1, "Data");*/
|
|
payload_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
call_dissector_only(data_handle, payload_tvb, pinfo, rohc_tree, NULL);
|
|
return tvb_length(tvb);
|
|
}
|
|
|
|
if (!pinfo->fd->flags.visited){
|
|
gint key = cid;
|
|
|
|
/*g_warning("Lookup CID %u",cid);*/
|
|
rohc_cid_context = (rohc_cid_context_t*)g_hash_table_lookup(rohc_cid_hash, GUINT_TO_POINTER(key));
|
|
if(rohc_cid_context){
|
|
/*g_warning("Found CID %u",cid);*/
|
|
}else{
|
|
rohc_cid_context = wmem_new(wmem_file_scope(), rohc_cid_context_t);
|
|
/*rohc_cid_context->d_mode;*/
|
|
rohc_cid_context->rnd = p_rohc_info->rnd;
|
|
rohc_cid_context->udp_checksum_present = p_rohc_info->udp_checksum_present;
|
|
rohc_cid_context->profile = p_rohc_info->profile;
|
|
rohc_cid_context->mode = p_rohc_info->mode;
|
|
rohc_cid_context->rohc_ip_version = p_rohc_info->rohc_ip_version;
|
|
rohc_cid_context->large_cid_present = p_rohc_info->large_cid_present;
|
|
rohc_cid_context->prev_ir_frame_number = -1;
|
|
rohc_cid_context->ir_frame_number = -1;
|
|
/*g_warning("Store dummy data %u",cid);*/
|
|
}
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0, rohc_cid_context);
|
|
} else {
|
|
rohc_cid_context = (rohc_cid_context_t*)p_get_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0);
|
|
}
|
|
|
|
/* Call IP for uncompressed*/
|
|
DISSECTOR_ASSERT(rohc_cid_context);
|
|
if (rohc_cid_context->profile==ROHC_PROFILE_UNCOMPRESSED) {
|
|
if (rohc_cid_context->large_cid_present) {
|
|
guint8 *payload_data;
|
|
gint len;
|
|
get_self_describing_var_len_val(tvb, rohc_tree, offset+1, hf_rohc_large_cid, &val_len);
|
|
len = tvb_length_remaining(tvb, offset);
|
|
if (len >= val_len) {
|
|
len -= val_len;
|
|
payload_data = (guint8 *)wmem_alloc(pinfo->pool, len);
|
|
tvb_memcpy(tvb, payload_data, offset, 1);
|
|
tvb_memcpy(tvb, &payload_data[1], offset+1+val_len, len-1);
|
|
next_tvb = tvb_new_child_real_data(tvb, payload_data, len, len);
|
|
add_new_data_source(pinfo, next_tvb, "Payload");
|
|
}
|
|
}
|
|
else {
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
}
|
|
if ((oct&0xf0)==0x40) {
|
|
call_dissector(ip_handle, next_tvb, pinfo, tree);
|
|
}
|
|
else if ((oct&0xf0)==0x60) {
|
|
call_dissector(ipv6_handle, next_tvb, pinfo, tree);
|
|
}
|
|
else {
|
|
call_dissector(data_handle, next_tvb, pinfo, tree);
|
|
}
|
|
col_prepend_fstr(pinfo->cinfo, COL_PROTOCOL, "ROHC <");
|
|
col_append_str(pinfo->cinfo, COL_PROTOCOL, ">");
|
|
return tvb_length(tvb);
|
|
}
|
|
else if (((oct&0x80)==0x00) && (rohc_cid_context->profile==ROHC_PROFILE_RTP)) {
|
|
/* 5.7.1. Packet type 0: UO-0, R-0, R-0-CRC */
|
|
offset = dissect_rohc_pkt_type_0(tvb, pinfo, rohc_tree, offset, oct, rohc_cid_context);
|
|
} else if ((oct&0xc0)==0x80) {
|
|
if (rohc_cid_context->mode == RELIABLE_BIDIRECTIONAL) {
|
|
/* 5.7.2. Packet type 1 (R-mode): R-1, R-1-TS, R-1-ID */
|
|
offset = dissect_rohc_pkt_type_1_r_mode(tvb, pinfo, rohc_tree, offset, rohc_cid_context);
|
|
}
|
|
else {
|
|
/* 5.7.3. Packet type 1 (U/O-mode): UO-1, UO-1-ID, UO-1-TS */
|
|
offset = dissect_rohc_pkt_type_1_u_o_mode(tvb, pinfo, rohc_tree, offset, rohc_cid_context);
|
|
}
|
|
} else if ((oct&0xe0)==0xc0) {
|
|
/* 5.7.4. Packet type 2: UOR-2 */
|
|
offset = dissect_rohc_pkt_type_2(tvb, pinfo, rohc_tree, offset, rohc_cid_context);
|
|
}
|
|
|
|
/* IP-ID */
|
|
if (rohc_cid_context->rnd) {
|
|
proto_tree_add_item(rohc_tree, hf_rohc_ip_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
}
|
|
|
|
/* UDP Checksum */
|
|
if (rohc_cid_context->udp_checksum_present) {
|
|
proto_tree_add_item(rohc_tree, hf_rohc_udp_checksum, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
}
|
|
|
|
payload_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
call_dissector_only(data_handle, payload_tvb, pinfo, tree, NULL);
|
|
|
|
return tvb_length(tvb);
|
|
}
|
|
|
|
/* Set up rohc_cid_hash which holds data for a CID
|
|
* needed to dissect subsequent packages.
|
|
* XXXX ToDo:
|
|
* A better Key than just the CID may have to be devised.
|
|
*
|
|
*/
|
|
|
|
|
|
static gint cid_hash_equal(gconstpointer v, gconstpointer v2)
|
|
{
|
|
return (v == v2);
|
|
}
|
|
|
|
static guint cid_hash_func(gconstpointer v)
|
|
{
|
|
return GPOINTER_TO_UINT(v);
|
|
}
|
|
|
|
|
|
static void
|
|
rohc_init_protocol(void)
|
|
{
|
|
/* Destroy any existing hashes. */
|
|
if (rohc_cid_hash)
|
|
g_hash_table_destroy(rohc_cid_hash);
|
|
|
|
/* Now create them again */
|
|
rohc_cid_hash = g_hash_table_new(cid_hash_func, cid_hash_equal);
|
|
}
|
|
|
|
void
|
|
proto_register_rohc(void)
|
|
{
|
|
|
|
static hf_register_info hf[] =
|
|
{
|
|
{ &hf_rohc_padding,
|
|
{ "Padding","rohc.pading",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_add_cid,
|
|
{ "Add-CID","rohc.add_cid",
|
|
FT_UINT8, BASE_HEX, NULL, 0xf0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_feedback,
|
|
{ "Feedback","rohc.feedback",
|
|
FT_UINT8, BASE_HEX, NULL, 0xf8,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_code,
|
|
{ "Code","rohc.code",
|
|
FT_UINT8, BASE_DEC, NULL, 0x07,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_size,
|
|
{ "Size","rohc.size",
|
|
FT_UINT8, BASE_DEC, NULL, 0x00,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ir_packet,
|
|
{ "IR packet","rohc.ir_packet",
|
|
FT_UINT8, BASE_HEX, NULL, 0xfe,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ir_dyn_packet,
|
|
{ "IR-DYN packet","rohc.ir_dyn_packet",
|
|
FT_UINT8, BASE_HEX, NULL, 0xff,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_small_cid,
|
|
{ "Small CID","rohc.small_cid",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0f,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_large_cid,
|
|
{ "Large CID","rohc.large_cid",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_acktype,
|
|
{ "Acktype","rohc.acktype",
|
|
FT_UINT8, BASE_DEC, VALS(rohc_acktype_vals), 0xc0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_mode,
|
|
{ "Mode","rohc.mode",
|
|
FT_UINT8, BASE_DEC, VALS(rohc_mode_vals), 0x30,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_sn,
|
|
{ "SN LSB","rohc.sn",
|
|
FT_UINT16, BASE_HEX_DEC, NULL, 0x0fff,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_profile_spec_octet,
|
|
{ "Profile-specific octet","rohc.profile_spec_octet",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_fb1_sn,
|
|
{ "SN LSB","rohc.sn",
|
|
FT_UINT8, BASE_HEX_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_opt_type,
|
|
{ "Option type","rohc.opt_type",
|
|
FT_UINT8, BASE_DEC, VALS(rohc_opt_type_vals), 0xf0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_opt_len,
|
|
{ "Option length","rohc.opt_length",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0f,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_crc,
|
|
{ "CRC","rohc.crc",
|
|
FT_UINT8, BASE_HEX_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_opt_sn,
|
|
{ "SN additional bits","rohc.opt.sn_add_bits",
|
|
FT_UINT8, BASE_HEX_DEC, NULL, 0x0,
|
|
"Feedback Option SN", HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ext_sn,
|
|
{ "SN LSB","rohc.sn",
|
|
FT_UINT24, BASE_HEX_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_opt_clock,
|
|
{ "Clock", "rohc.opt.clock",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Feedback Option Clock", HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_opt_jitter,
|
|
{ "Max Jitter", "rohc.opt.jitter",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Feedback Option Jitter", HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_opt_loss,
|
|
{ "Longest loss event (packets)", "rohc.opt.loss",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Feedback Option Loss", HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_profile,
|
|
{ "Profile","rohc.profile",
|
|
FT_UINT8, BASE_DEC, VALS(rohc_profile_vals), 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_d_bit,
|
|
{ "D - Dynamic chain","rohc.d",
|
|
FT_BOOLEAN, 8, TFS(&tfs_present_not_present), 0x01,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ip_version,
|
|
{ "Version","rohc.ip.version",
|
|
FT_UINT8, BASE_DEC, VALS(rohc_ip_version_vals), 0xf0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_static_ipv4,
|
|
{ "Static IPv4 chain",
|
|
"rohc.static.ipv4", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ip_protocol,
|
|
{ "Protocol","rohc.ip.protocol",
|
|
FT_UINT8, BASE_DEC|BASE_EXT_STRING, &ipproto_val_ext, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ipv4_src,
|
|
{ "Source address","rohc.ipv4_src",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ipv4_dst,
|
|
{ "Destination address","rohc.ipv4_dst",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ipv6_flow,
|
|
{ "Flow Label","rohc.ipv6.flow",
|
|
FT_UINT24, BASE_DEC, NULL, 0x0fffff,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ipv6_nxt_hdr,
|
|
{ "Next Header","rohc.ipv6.nxt_hdr",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ipv6_src,
|
|
{ "Source Address","rohc.ipv6.src",
|
|
FT_IPv6, BASE_NONE, NULL, 0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ipv6_dst,
|
|
{ "Destination Address","rohc.ipv6.src",
|
|
FT_IPv6, BASE_NONE, NULL, 0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_static_udp,
|
|
{ "Static UDP chain", "rohc.static.udp",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_udp_src_port,
|
|
{ "Source Port","rohc.udp_src_port",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_udp_dst_port,
|
|
{ "Destination Port","rohc.udp_dst_port",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_static_rtp,
|
|
{ "Static RTP chain",
|
|
"rohc.static.rtp", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_ssrc,
|
|
{ "SSRC","rohc.rtp.ssrc",
|
|
FT_UINT32, BASE_HEX_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_dynamic_ipv4,
|
|
{ "Dynamic IPv4 chain",
|
|
"rohc.dynamic.ipv4", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_dynamic_udp,
|
|
{ "Dynamic UDP chain",
|
|
"rohc.dynamic.udp", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_tos,
|
|
{ "Type of Service","rohc.rtp.tos",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_ttl,
|
|
{ "Time to Live","rohc.rtp.ttl",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_id,
|
|
{ "Identification","rohc.rtp.id",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_df,
|
|
{ "Don't Fragment(DF)","rohc.rtp.df",
|
|
FT_BOOLEAN, 8, NULL, 0x80,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_rnd,
|
|
{ "RND(IP-ID behaves randomly)","rohc.rtp.rnd",
|
|
FT_BOOLEAN, 8, NULL, 0x40,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_nbo,
|
|
{ "Network Byte Order (NBO)","rohc.rtp.nbo",
|
|
FT_BOOLEAN, 8, NULL, 0x20,
|
|
"Whether the IP-ID is in Network Byte Order" , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_dynamic_udp_checksum,
|
|
{ "UDP Checksum", "rohc.dynamic.udp.checksum",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_dynamic_rtp,
|
|
{ "Dynamic RTP chain",
|
|
"rohc.dynamic.rtp", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_v,
|
|
{ "Version","rohc.rtp.v",
|
|
FT_UINT8, BASE_DEC, NULL, 0xc0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_p,
|
|
{ "Padding(P)","rohc.rtp.p",
|
|
FT_BOOLEAN, 8, NULL, 0x20,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_rx,
|
|
{ "RX","rohc.rtp.rx",
|
|
FT_BOOLEAN, 8, NULL, 0x10,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_cc,
|
|
{ "CC","rohc.rtp.cc",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0f,
|
|
"CSRC counter from original RTP header" , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_m,
|
|
{ "Marker Bit (M)","rohc.rtp.m",
|
|
FT_BOOLEAN, BASE_NONE, TFS(&tfs_set_notset), 0x00,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_pt,
|
|
{ "Payload Type(PT)","rohc.rtp.pt",
|
|
FT_UINT8, BASE_DEC|BASE_EXT_STRING, &rtp_payload_type_vals_ext, 0x7f,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_sn,
|
|
{ "Sequence Number(SN)","rohc.rtp.sn",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_timestamp,
|
|
{ "RTP Timestamp","rohc.rtp.timestamp",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_x,
|
|
{ "X","rohc.rtp.x",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x10,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_mode,
|
|
{ "Mode","rohc.rtp.mode",
|
|
FT_UINT8, BASE_DEC, VALS(rohc_mode_vals), 0x0c,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_tis,
|
|
{ "TIS","rohc.rtp.tis",
|
|
FT_BOOLEAN, 8, NULL, 0x02,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_tss,
|
|
{ "TSS","rohc.rtp.tss",
|
|
FT_BOOLEAN, 8, NULL, 0x01,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_ts_stride,
|
|
{ "TS_Stride","rohc.rtp.ts_stride",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_rtp_time_stride,
|
|
{ "Time_Stride","rohc.rtp.time_stride",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_var_len,
|
|
{ "Variable length","rohc.var_len",
|
|
FT_UINT8, BASE_DEC, VALS(rohc_var_len_vals), 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ipv6_tc,
|
|
{ "Traffic class","rohc.tc",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ipv6_hop_limit,
|
|
{ "Hop limit","rohc.hop_limit",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ir_previous_frame,
|
|
{ "Previous IR frame","rohc.ir.prev.frame_num",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ir_pkt_frame,
|
|
{ "Setup by IR frame","rohc.ir.frame_num",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_comp_sn,
|
|
{ "Compressed Sequence Number","rohc.comp.sn",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_r_0_crc,
|
|
{ "CRC","rohc.r_0_crc",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_x,
|
|
{ "Extension","rohc.x",
|
|
FT_BOOLEAN, BASE_NONE, TFS(&tfs_present_not_present), 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ts,
|
|
{ "Compressed RTP timestamp","rohc.tp",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_comp_ip_id,
|
|
{ "Compressed IP-ID","rohc.comp_ip_id",
|
|
FT_UINT16, BASE_HEX_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_t,
|
|
{ "T bit","rohc.t",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list,
|
|
{ "Compressed List", "rohc.compressed-list",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_et,
|
|
{ "Encoding Type", "rohc.compressed-list.et",
|
|
FT_UINT8, BASE_DEC, VALS(compressed_list_encoding_type_vals), 0xc0,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_gp,
|
|
{ "Gen-id Present", "rohc.compressed-list.gp",
|
|
FT_UINT8, BASE_DEC, NULL, 0x20,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_ps,
|
|
{ "PS", "rohc.compressed-list.ps",
|
|
FT_UINT8, BASE_DEC, VALS(compressed_list_ps_vals), 0x10,
|
|
"Size of xi fields", HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_res,
|
|
{ "Reserved", "rohc.compressed-list.res",
|
|
FT_UINT8, BASE_DEC, NULL, 0x10,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_count,
|
|
{ "Count", "rohc.compressed-list.count",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0f,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_cc,
|
|
{ "CSRC Counter", "rohc.compressed-list.cc",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0f,
|
|
"CSRC Counter from original RTP header", HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_xi_1,
|
|
{ "XI 1", "rohc.compressed-list.xi_1",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0f,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_gen_id,
|
|
{ "gen_id", "rohc.compressed-list.gen-id",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_ref_id,
|
|
{ "ref_id", "rohc.compressed-list.ref-id",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_mask_size,
|
|
{ "Mask size","rohc.compressed-list.mask_size",
|
|
FT_BOOLEAN, 8, TFS(&rohc_cmp_lst_mask_size_vals), 0x80,
|
|
NULL , HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_ins_bit_mask,
|
|
{ "Insertion bit mask","rohc.compressed-list.ins_bit_mask",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_compressed_list_rem_bit_mask,
|
|
{ "Removal bit mask","rohc.compressed-list.rem_bit_mask",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_spare_bits,
|
|
{ "Spare bits(0)", "rohc.spare_bits",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_ip_id,
|
|
{ "IP-ID", "rohc.ip-id",
|
|
FT_UINT16, BASE_HEX_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_rohc_udp_checksum,
|
|
{ "UDP checksum", "rohc.udp_checksum",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_rohc,
|
|
&ett_rohc_conf,
|
|
&ett_rohc_fb,
|
|
&ett_rohc_feedback,
|
|
&ett_rohc_ir,
|
|
&ett_rohc_ir_dyn,
|
|
&ett_rohc_static_ipv4,
|
|
&ett_rohc_static_udp,
|
|
&ett_rohc_static_rtp,
|
|
&ett_rohc_rtp_static,
|
|
&ett_rohc_rtp_dynamic,
|
|
&ett_rohc_dynamic_ipv4,
|
|
&ett_rohc_dynamic_udp,
|
|
&ett_rohc_dynamic_rtp,
|
|
&ett_rohc_compressed_list,
|
|
&ett_rohc_packet
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_rohc_profile_spec_octet, { "rohc.profile_spec_octet.bad", PI_PROTOCOL, PI_WARN, "Invalid profile-specific octet value", EXPFILL }},
|
|
{ &ei_rohc_feedback_type_2_is_not_applicable_for_uncompressed_profile, { "rohc.feedback.type_2_is_not_applicable_for_uncompressed_profile", PI_PROTOCOL, PI_WARN, "Feedback type 2 is not applicable for uncompressed profile", EXPFILL }},
|
|
{ &ei_rohc_rohc_opt_clock, { "rohc.opt.clock.udp", PI_MALFORMED, PI_ERROR, "CLOCK option should not be used for UDP", EXPFILL }},
|
|
{ &ei_rohc_opt_jitter, { "rohc.opt.jitter.udp", PI_MALFORMED, PI_ERROR, "JITTER option should not be used for UDP", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_rohc;
|
|
|
|
/* Register the protocol name and description */
|
|
proto_rohc = proto_register_protocol("RObust Header Compression (ROHC)", "ROHC", "rohc");
|
|
|
|
rohc_handle = new_register_dissector("rohc", dissect_rohc, proto_rohc);
|
|
|
|
register_init_routine(&rohc_init_protocol);
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array(proto_rohc, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_rohc = expert_register_protocol(proto_rohc);
|
|
expert_register_field_array(expert_rohc, ei, array_length(ei));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_rohc(void)
|
|
{
|
|
dissector_add_uint("ethertype", ETHERTYPE_ROHC, rohc_handle);
|
|
|
|
ip_handle = find_dissector("ip");
|
|
ipv6_handle = find_dissector("ipv6");
|
|
data_handle = find_dissector("data");
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|