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wireshark/epan/dissectors/packet-rohc.c

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/* packet-rohc.c
* Routines for RObust Header Compression (ROHC) dissection.
*
* Copyright 2011, Anders Broman <anders.broman[at]ericsson.com>
* Per Liedberg <per.liedberg [at]ericsson.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* Ref:
* https://www.ietf.org/rfc/rfc3095 RObust Header Compression (ROHC): Framework and four profiles: RTP, UDP, ESP, and uncompressed
* https://datatracker.ietf.org/doc/rfc4815/ RObust Header Compression (ROHC): Corrections and Clarifications to RFC 3095
* https://datatracker.ietf.org/doc/rfc5225/ RObust Header Compression Version 2 (ROHCv2): Profiles for RTP, UDP, IP, ESP and UDP-Lite
*
* Only RTP (1) and UDP (2) are currently implemented.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/etypes.h>
#include <epan/ipproto.h>
#include <epan/addr_resolv.h>
#include <epan/rtp_pt.h>
#include <epan/expert.h>
#include <epan/proto_data.h>
#include "packet-rohc.h"
void proto_register_rohc(void);
void proto_reg_handoff_rohc(void);
static int
dissect_compressed_list(int expected_encoding_type _U_, packet_info *pinfo _U_,
proto_tree *tree, tvbuff_t *tvb, int offset);
/* cid -> rohc_cid_context_t* */
static GHashTable *rohc_cid_hash = NULL;
/* Initialize the protocol and registered fields */
static int proto_rohc = -1;
static int hf_rohc_padding = -1;
static int hf_rohc_add_cid = -1;
static int hf_rohc_feedback = -1;
static int hf_rohc_code = -1;
static int hf_rohc_size = -1;
static int hf_rohc_ir_packet = -1;
static int hf_rohc_ir_dyn_packet = -1;
static int hf_rohc_small_cid = -1;
static int hf_rohc_large_cid = -1;
static int hf_rohc_acktype = -1;
static int hf_rohc_mode = -1;
static int hf_rohc_sn = -1;
static int hf_rohc_profile_spec_octet = -1;
static int hf_rohc_fb1_sn = -1;
static int hf_rohc_opt_type = -1;
static int hf_rohc_opt_len = -1;
static int hf_rohc_crc = -1;
static int hf_rohc_opt_sn = -1;
static int hf_rohc_ext = -1;
static int hf_rohc_ext_sn = -1;
static int hf_rohc_opt_clock = -1;
static int hf_rohc_opt_jitter = -1;
static int hf_rohc_opt_loss = -1;
static int hf_rohc_profile = -1;
static int hf_rohc_d_bit = -1;
static int hf_rohc_ip_version = -1;
static int hf_rohc_ip_version_ip_profile = -1;
static int hf_rohc_ip_protocol = -1;
static int hf_rohc_static_ipv4 = -1;
static int hf_rohc_ipv4_src = -1;
static int hf_rohc_ipv4_dst = -1;
static int hf_rohc_ipv6_flow = -1;
static int hf_rohc_ipv6_nxt_hdr = -1;
static int hf_rohc_ipv6_src = -1;
static int hf_rohc_ipv6_dst = -1;
static int hf_rohc_static_udp = -1;
static int hf_rohc_udp_src_port = -1;
static int hf_rohc_udp_dst_port = -1;
static int hf_rohc_static_rtp = -1;
static int hf_rohc_rtp_ssrc = -1;
static int hf_rohc_dynamic_ipv4 = -1;
static int hf_rohc_dynamic_udp = -1;
static int hf_rohc_rtp_tos = -1;
static int hf_rohc_rtp_ttl = -1;
static int hf_rohc_rtp_id = -1;
static int hf_rohc_rtp_df = -1;
static int hf_rohc_rtp_rnd = -1;
static int hf_rohc_rtp_nbo = -1;
static int hf_rohc_dynamic_udp_checksum = -1;
static int hf_rohc_dynamic_rtp =-1;
static int hf_rohc_rtp_v = -1;
static int hf_rohc_rtp_p = -1;
static int hf_rohc_rtp_rx = -1;
static int hf_rohc_rtp_cc = -1;
static int hf_rohc_rtp_m = -1;
static int hf_rohc_rtp_pt = -1;
static int hf_rohc_rtp_sn = -1;
static int hf_rohc_rtp_timestamp = -1;
static int hf_rohc_rtp_x = -1;
static int hf_rohc_rtp_mode = -1;
static int hf_rohc_rtp_tis = -1;
static int hf_rohc_rtp_tss = -1;
static int hf_rohc_rtp_ts_stride = -1;
static int hf_rohc_rtp_time_stride = -1;
static int hf_rohc_var_len = -1;
static int hf_rohc_ipv6_tc = -1;
static int hf_rohc_ipv6_hop_limit = -1;
static int hf_rohc_ir_pkt_frame = -1;
static int hf_rohc_ir_previous_frame = -1;
static int hf_rohc_ir_profile = -1;
static int hf_rohc_ir_ip_version = -1;
static int hf_rohc_ir_mode = -1;
static int hf_rohc_comp_sn = -1;
static int hf_rohc_r_0_crc = -1;
static int hf_rohc_x = -1;
static int hf_rohc_ts = -1;
static int hf_rohc_comp_ip_id = -1;
static int hf_rohc_comp_ip_id2 = -1;
static int hf_rohc_t = -1;
static int hf_rohc_ext3_flags = -1;
static int hf_rohc_ext3_s = -1;
static int hf_rohc_ext3_r_ts = -1;
static int hf_rohc_ext3_tsc = -1;
static int hf_rohc_ext3_udp_mode = -1;
static int hf_rohc_ext3_i = -1;
static int hf_rohc_ext3_ip = -1;
static int hf_rohc_ext3_ip2 = -1;
static int hf_rohc_ext3_rtp = -1;
static int hf_rohc_ext3_inner_ip_flags = -1;
static int hf_rohc_ext3_inner_tos = -1;
static int hf_rohc_ext3_inner_ttl = -1;
static int hf_rohc_ext3_inner_df = -1;
static int hf_rohc_ext3_inner_pr = -1;
static int hf_rohc_ext3_inner_ipx = -1;
static int hf_rohc_ext3_inner_nbo = -1;
static int hf_rohc_ext3_inner_rnd = -1;
static int hf_rohc_ext3_inner_ip2 = -1;
static int hf_rohc_ext3_outer_ip_flags = -1;
static int hf_rohc_ext3_outer_tos = -1;
static int hf_rohc_ext3_outer_ttl = -1;
static int hf_rohc_ext3_outer_df = -1;
static int hf_rohc_ext3_outer_pr = -1;
static int hf_rohc_ext3_outer_ipx = -1;
static int hf_rohc_ext3_outer_nbo = -1;
static int hf_rohc_ext3_outer_rnd = -1;
static int hf_rohc_ext3_outer_i2 = -1;
static int hf_rohc_ext3_rtp_flags = -1;
static int hf_rohc_ext3_rtp_mode = -1;
static int hf_rohc_ext3_r_pt = -1;
static int hf_rohc_ext3_m = -1;
static int hf_rohc_ext3_r_x = -1;
static int hf_rohc_ext3_csrc = -1;
static int hf_rohc_ext3_tss = -1;
static int hf_rohc_ext3_tis = -1;
static int hf_rohc_ext3_r_p = -1;
static int hf_rohc_compressed_list = -1;
static int hf_rohc_compressed_list_et = -1;
static int hf_rohc_compressed_list_gp = -1;
static int hf_rohc_compressed_list_ps = -1;
static int hf_rohc_compressed_list_res = -1;
static int hf_rohc_compressed_list_count = -1;
static int hf_rohc_compressed_list_cc = -1;
static int hf_rohc_compressed_list_xi_1 = -1;
static int hf_rohc_compressed_list_gen_id = -1;
static int hf_rohc_compressed_list_ref_id = -1;
static int hf_rohc_compressed_list_mask_size = -1;
static int hf_rohc_compressed_list_ins_bit_mask = -1;
static int hf_rohc_compressed_list_rem_bit_mask = -1;
static int hf_rohc_spare_bits = -1;
static int hf_rohc_ip_id = -1;
static int hf_rohc_udp_checksum = -1;
/* Generated from convert_proto_tree_add_text.pl */
static int hf_rohc_no_configuration_info = -1;
static int hf_rohc_unknown_option_data = -1;
static int hf_rohc_error_packet = -1;
static int hf_rohc_configured_by_ir_packet = -1;
static int ett_rohc = -1;
static int ett_rohc_conf = -1;
static int ett_rohc_fb = -1;
static int ett_rohc_feedback = -1;
static int ett_rohc_ir = -1;
static int ett_rohc_ir_dyn = -1;
static int ett_rohc_static_ipv4 = -1;
static int ett_rohc_static_udp = -1;
static int ett_rohc_static_rtp = -1;
static int ett_rohc_rtp_static = -1;
static int ett_rohc_rtp_dynamic = -1;
static int ett_rohc_dynamic_ipv4 = -1;
static int ett_rohc_dynamic_udp = -1;
static int ett_rohc_dynamic_rtp = -1;
static int ett_rohc_compressed_list = -1;
static int ett_rohc_packet = -1;
static int ett_rohc_ext = -1;
static int ett_rohc_ext3_flags = -1;
static int ett_rohc_ext3_inner_ip_flags = -1;
static int ett_rohc_ext3_outer_ip_flags = -1;
static int ett_rohc_ext3_rtp_flags = -1;
static expert_field ei_rohc_profile_spec_octet = EI_INIT;
static expert_field ei_rohc_rohc_opt_clock = EI_INIT;
static expert_field ei_rohc_opt_jitter = EI_INIT;
static expert_field ei_rohc_feedback_type_2_is_not_applicable_for_uncompressed_profile = EI_INIT;
static expert_field ei_rohc_not_dissected_yet = EI_INIT;
static expert_field ei_rohc_profile_specific = EI_INIT;
static expert_field ei_rohc_profile_not_supported = EI_INIT;
static expert_field ei_rohc_ip_version = EI_INIT;
static expert_field ei_rohc_desegmentation_not_implemented = EI_INIT;
static dissector_handle_t rohc_handle;
static dissector_handle_t ip_handle;
static dissector_handle_t ipv6_handle;
enum rohc_d_mode
{
NO_CONTEXT = 1,
STATIC_CONTEXT = 2,
FULL_CONTEXT = 3
};
typedef struct _rohc_cid_context_t
{
guint8 rohc_ip_version;
gboolean large_cid_present;
enum rohc_mode mode;
enum rohc_d_mode d_mode; /* Decompressor mode (not used) */
gboolean rnd;
gboolean udp_checksum_present;
guint16 profile;
gint prev_ir_frame_number; /* The frame number of the previous IR packet seen. -1 if not set */
gint ir_frame_number; /* The frame number of the latest IR packet seen. -1 if not set */
} rohc_cid_context_t;
static const value_string rohc_profile_vals[] =
{
{ 0x0000, "Uncompressed" }, /*RFC 5795*/
{ 0x0001, "RTP" }, /*RFC 3095*/
{ 0x0002, "UDP" }, /*RFC 3095*/
{ 0x0003, "ESP" }, /*RFC 3095*/
{ 0x0004, "IP" }, /*RFC 3843*/
{ 0x0005, "LLA" }, /*RFC 3242*/
{ 0x0105, "LLA with R-mode" }, /*RFC 3408*/
{ 0x0006, "TCP" }, /*RFC 4996*/
{ 0x0007, "RTP/UDP-Lite" }, /*RFC 4019*/
{ 0x0008, "UDP-Lite" }, /*RFC 4019*/
{ 0x0101, "v2 RTP" }, /*RFC 5225*/
{ 0x0102, "v2 UDP" }, /*RFC 5225*/
{ 0x0103, "v2 ESP" }, /*RFC 5225*/
{ 0x0104, "v2 IP" }, /*RFC 5225*/
{ 0x0107, "v2 RTP/UDP-Lite" }, /*RFC 5225*/
{ 0x0108, "v2 UDP-Lite" }, /*RFC 5225*/
{ 0, NULL },
};
/* Defaults if not supplied */
static guint16 g_profile = ROHC_PROFILE_UNKNOWN;
static guint8 g_version = 4;
static const value_string rohc_acktype_vals[] =
{
{ 0, "ACK" },
{ 1, "NACK" },
{ 2, "STATIC-NACK" },
{ 3, "reserved (MUST NOT be used. Otherwise unparsable.)" },
{ 0, NULL },
};
static const value_string rohc_mode_vals[] =
{
{ 0, "Reserved" },
{ 1, "Unidirectional" },
{ 2, "Bidirectional Optimistic" },
{ 3, "Bidirectional Reliable" },
{ 0, NULL },
};
static const value_string rohc_opt_type_vals[] =
{
{ 1, "CRC" },
{ 2, "REJECT" },
{ 3, "SN-NOT-VALID" },
{ 4, "SN" },
{ 5, "CLOCK" },
{ 6, "JITTER" },
{ 7, "LOSS" },
{ 0, NULL },
};
static const value_string rohc_ip_version_vals[] =
{
{ 0, "Unknown" },
{ 4, "IPv4" },
{ 6, "IPv6" },
{ 0, NULL },
};
static const value_string rohc_ip_version_ip_profile_vals[] =
{
{ 0x4, "IPv4" },
{ 0x6, "IPv6" },
{ 0xc, "IPv4" },
{ 0xe, "IPv6" },
{ 0, NULL },
};
static const value_string rohc_var_len_vals[] =
{
{ 0, "One octet" },
{ 2, "Two octets" },
{ 6, "Three octets" },
{ 7, "Four octets" },
{ 0, NULL },
};
static const value_string compressed_list_encoding_type_vals[] =
{
{ 0, "Generic scheme" },
{ 1, "Insertion only scheme" },
{ 2, "Removal only scheme" },
{ 3, "Remove then insert scheme" },
{ 0, NULL },
};
static const value_string compressed_list_ps_vals[] =
{
{ 0, "4-bit XI fields" },
{ 1, "8-bit XI fields" },
{ 0, NULL },
};
/* RTP extension 3 flags masks */
#define ROHC_RTP_EXT3_FLAGS_MASK 0x7f
#define ROHC_RTP_EXT3_S_MASK 0x20
#define ROHC_RTP_EXT3_R_TS_MASK 0x10
#define ROHC_RTP_EXT3_TSC_MASK 0x08
#define ROHC_RTP_EXT3_I_MASK 0x04
#define ROHC_RTP_EXT3_IP_MASK 0x02
#define ROHC_RTP_EXT3_RTP_MASK 0x01
/* RTP Inner IP header flags masks */
#define ROHC_RTP_EXT3_INNER_TOS_MASK 0x80
#define ROHC_RTP_EXT3_INNER_TTL_MASK 0x40
#define ROHC_RTP_EXT3_INNER_DF_MASK 0x20
#define ROHC_RTP_EXT3_INNER_PR_MASK 0x10
#define ROHC_RTP_EXT3_INNER_IPX_MASK 0x08
#define ROHC_RTP_EXT3_INNER_NBO_MASK 0x04
#define ROHC_RTP_EXT3_INNER_RND_MASK 0x02
#define ROHC_RTP_EXT3_INNER_IP2_MASK 0x01
/* RTP Outer IP header flags masks */
#define ROHC_RTP_EXT3_OUTER_TOS_MASK 0x80
#define ROHC_RTP_EXT3_OUTER_TTL_MASK 0x40
#define ROHC_RTP_EXT3_OUTER_DF_MASK 0x20
#define ROHC_RTP_EXT3_OUTER_PR_MASK 0x10
#define ROHC_RTP_EXT3_OUTER_IPX_MASK 0x08
#define ROHC_RTP_EXT3_OUTER_NBO_MASK 0x04
#define ROHC_RTP_EXT3_OUTER_RND_MASK 0x02
#define ROHC_RTP_EXT3_OUTER_I2_MASK 0x01
/* RTP header flags masks */
#define ROHC_RTP_EXT3_RTP_MODE_MASK 0xc0
#define ROHC_RTP_EXT3_R_PT_MASK 0x20
#define ROHC_RTP_EXT3_M_MASK 0x10
#define ROHC_RTP_EXT3_R_X_MASK 0x08
#define ROHC_RTP_EXT3_CSRC_MASK 0x04
#define ROHC_RTP_EXT3_TSS_MASK 0x02
#define ROHC_RTP_EXT3_TIS_MASK 0x01
/* RTP header fields masks */
#define ROHC_RTP_EXT3_R_P_MASK 0x80
/* UDP extension 3 flag masks */
#define ROHC_UDP_EXT3_UDP_MODE_MASK 0x18
#define ROHC_UDP_EXT3_IP2_MASK 0x01
/* 4.5.6. Self-describing variable-length values */
static guint32
get_self_describing_var_len_val(tvbuff_t *tvb, proto_tree *tree, int offset, int hf_index, guint8 *val_len)
{
guint8 oct;
guint32 val = 0;
int num_bits = 0, bit_offset = offset <<3;
/* Get first byte */
oct = tvb_get_guint8(tvb, offset);
if ((oct&0x80)==0) {
/* First bit is 0 - 1 octet */
*val_len = 1;
val = (oct&0x7f);
proto_tree_add_bits_item(tree, hf_rohc_var_len, tvb, bit_offset, 1, ENC_BIG_ENDIAN);
num_bits = 7;
bit_offset++;
} else if ((oct&0xc0)==0x80) {
/* First bits are 10: 2 octets */
*val_len = 2;
proto_tree_add_bits_item(tree, hf_rohc_var_len, tvb, bit_offset, 2, ENC_BIG_ENDIAN);
bit_offset+=2;
num_bits = 14;
val = tvb_get_ntohs(tvb, offset)&0x3fff;
} else if ((oct&0xe0)==0xc0) {
/* First bits are 110: 3 octets */
*val_len = 3;
proto_tree_add_bits_item(tree, hf_rohc_var_len, tvb, bit_offset, 3, ENC_BIG_ENDIAN);
bit_offset+=3;
num_bits = 21;
val = tvb_get_ntoh24(tvb, offset)&0x1fffff;
} else if ((oct&0xe0)==0xe0) {
/* First bits are 111: 4 octets */
*val_len = 4;
proto_tree_add_bits_item(tree, hf_rohc_var_len, tvb, bit_offset, 3, ENC_BIG_ENDIAN);
bit_offset+=3;
num_bits = 29;
val = tvb_get_ntohl(tvb, offset)&0x1fffffff;
}
/* Add the field */
proto_tree_add_bits_item(tree, hf_index, tvb, bit_offset, num_bits, ENC_BIG_ENDIAN);
return val;
}
/* 5.7.1. Packet type 0: UO-0, R-0, R-0-CRC */
static int
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)
{
guint8 val_len = 0;
guint64 sn;
proto_tree *pkt_tree;
switch (rohc_cid_context->mode) {
case RELIABLE_BIDIRECTIONAL: /* R-mode */
if ((pkt_type&0xc0)==0x00) {
/* R-0
*
* 0 1 2 3 4 5 6 7
* +---+---+---+---+---+---+---+---+
* | 0 0 | SN |
* +===+===+===+===+===+===+===+===+
*/
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);
}
/* R-0 subtree */
col_append_str(pinfo->cinfo, COL_INFO, "R-0");
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, 1+val_len, ett_rohc_packet, NULL, "R-0 packet");
/* SN */
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)", (guint)sn);
} else if ((pkt_type&0xc0)==0x40) {
/* R-0-CRC
*
* 0 1 2 3 4 5 6 7
* +---+---+---+---+---+---+---+---+
* | 0 1 | SN |
* +===+===+===+===+===+===+===+===+
* |SN | CRC |
* +---+---+---+---+---+---+---+---+
*/
crumb_spec_t rohc_sn_crumbs[] = {
{ 2, 6},
{ 8, 1},
{ 0, 0}
};
if (rohc_cid_context->large_cid_present) {
/* Handle Large CID:s here */
get_self_describing_var_len_val(tvb, tree, offset+1, hf_rohc_large_cid, &val_len);
rohc_sn_crumbs[1].crumb_bit_offset += val_len*8;
}
/* R-0-CRC subtree */
col_append_str(pinfo->cinfo, COL_INFO, "R-0-CRC");
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, 2+val_len, ett_rohc_packet, NULL, "R-0-CRC packet");
/* SN */
proto_tree_add_split_bits_item_ret_val(pkt_tree, hf_rohc_comp_sn, tvb, (offset<<3),
rohc_sn_crumbs, &sn);
offset += (1 + val_len);
/* CRC */
proto_tree_add_bits_item(pkt_tree, hf_rohc_r_0_crc, tvb, (offset<<3)+1, 7, ENC_BIG_ENDIAN);
offset++;
/* Show SN in info column */
col_append_fstr(pinfo->cinfo, COL_INFO, " (sn=%u)", (guint)sn);
}
break;
case UNIDIRECTIONAL: /* U-mode */
/* Fall trough */
case OPTIMISTIC_BIDIRECTIONAL: /* O-mode */
/* UO-0
*
* 0 1 2 3 4 5 6 7
* +---+---+---+---+---+---+---+---+
* | 0 | SN | CRC |
* +===+===+===+===+===+===+===+===+
*/
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);
}
/* UO-0 subtree */
col_append_str(pinfo->cinfo, COL_INFO, "UO-0");
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, 1+val_len, ett_rohc_packet, NULL, "UO-0 packet");
/* SN */
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);
/* CRC */
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_append_str(pinfo->cinfo, COL_INFO, "Packet type 0");
break;
}
return offset;
}
/* 5.7.5. Extension formats */
/* UDP profile extension variations as described in 5.11.4 */
static int
dissect_rohc_ext_format(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset,
guint8 t, /* T-bit from base compressed header */
rohc_cid_context_t *rohc_cid_context)
{
/* Extension subtree */
int start_offset = offset;
proto_item *ext_ti = proto_tree_add_string_format(tree,
hf_rohc_ext,
tvb, offset, 0,
"", "Extension");
proto_tree *ext_tree = proto_item_add_subtree(ext_ti, ett_rohc_ext);
guint8 ext_type = (tvb_get_guint8(tvb, offset) & 0xc0) >> 6;
if (ext_type != 3) {
/* SN (common to extensions 0,1,2) */
proto_tree_add_bits_item(ext_tree, hf_rohc_comp_sn, tvb, (offset<<3)+2, 3, ENC_BIG_ENDIAN);
}
if (ext_type == 0) {
/* Extension 0:
RTP
* 0 1 2 3 4 5 6 7
* +---+---+---+---+---+---+---+---+
* | 0 0 | SN | +T |
* +---+---+---+---+---+---+---+---+
*
UDP
*
* +---+---+---+---+---+---+---+---+
* | 0 0 | SN | IP-ID |
* +---+---+---+---+---+---+---+---+
*
*/
proto_item_append_text(ext_ti, " 0");
if ((t == 0) || (rohc_cid_context->profile == ROHC_PROFILE_UDP)) {
/* IP-ID */
proto_tree_add_bits_item(ext_tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
} else {
/* TS */
proto_tree_add_bits_item(ext_tree, hf_rohc_ts, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
}
offset++;
} else if (ext_type == 1) {
/* Extension 1:
RTP
*
* +---+---+---+---+---+---+---+---+
* | 0 1 | SN | +T |
* +---+---+---+---+---+---+---+---+
* | -T |
* +---+---+---+---+---+---+---+---+
*
UDP
* +---+---+---+---+---+---+---+---+
* | 0 1 | SN | IP-ID |
* +---+---+---+---+---+---+---+---+
* | IP-ID |
* +---+---+---+---+---+---+---+---+
*/
proto_item_append_text(ext_ti, " 1");
if (rohc_cid_context->profile == ROHC_PROFILE_UDP) {
/* IP-ID */
proto_tree_add_bits_item(ext_tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+5, 11, ENC_BIG_ENDIAN);
offset++;
} else {
/* RTP profile */
if (t == 0) {
/* +T is IP-ID */
proto_tree_add_bits_item(ext_tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
offset++;
/* -T is TS */
proto_tree_add_bits_item(ext_tree, hf_rohc_ts, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
} else if (t == 1) {
/* +T is TS */
proto_tree_add_bits_item(ext_tree, hf_rohc_ts, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
offset++;
/* -T is IP-ID */
proto_tree_add_bits_item(ext_tree, hf_rohc_comp_ip_id, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
}
offset++;
}
} else if (ext_type == 2) {
/* Extension 2:
RTP
*
* +---+---+---+---+---+---+---+---+
* | 1 0 | SN | +T |
* +---+---+---+---+---+---+---+---+
* | +T |
* +---+---+---+---+---+---+---+---+
* | -T |
* +---+---+---+---+---+---+---+---+
*
UDP
* +---+---+---+---+---+---+---+---+
* | 1 0 | SN | IP-ID2 |
* +---+---+---+---+---+---+---+---+
* | IP-ID2 |
* +---+---+---+---+---+---+---+---+
* | IP-ID |
* +---+---+---+---+---+---+---+---+
*/
proto_item_append_text(ext_ti, " 2");
if (rohc_cid_context->profile == ROHC_PROFILE_UDP) {
/* IP-ID2 */
proto_tree_add_bits_item(ext_tree, hf_rohc_comp_ip_id2, tvb, (offset<<3)+5, 11, ENC_BIG_ENDIAN);
offset += 2;
/* IP ID */
proto_tree_add_bits_item(ext_tree, hf_rohc_comp_ip_id, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
offset++;
} else {
/* RTP Profile */
if (t == 0) {
/* +T is IP-ID */
proto_tree_add_bits_item(ext_tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+5, 11, ENC_BIG_ENDIAN);
offset += 2;
/* -T is TS */
proto_tree_add_bits_item(ext_tree, hf_rohc_ts, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
} else if (t == 1) {
/* +T is TS */
proto_tree_add_bits_item(ext_tree, hf_rohc_ts, tvb, (offset<<3)+5, 11, ENC_BIG_ENDIAN);
offset += 2;
/* -T is IP-ID */
proto_tree_add_bits_item(ext_tree, hf_rohc_comp_ip_id, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
}
offset++;
}
} else {
if ((rohc_cid_context->profile == ROHC_PROFILE_RTP) ||
(rohc_cid_context->profile == ROHC_PROFILE_UDP)) {
/* Extension 3:
*
* 0 1 2 3 4 5 6 7
* +-----+-----+-----+-----+-----+-----+-----+-----+
* | 1 1 | S |R-TS | Tsc | I | ip | rtp | (FLAGS)
* +-----+-----+-----+-----+-----+-----+-----+-----+
* | Inner IP header flags | ip2 | if ip = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* | Outer IP header flags | if ip2 = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* | SN | if S = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* / TS (encoded as in section 4.5.6) / 1-4 octets,
* ..... ..... ..... ..... ..... ..... ..... ..... if R-TS = 1
* | |
* / Inner IP header fields / variable,
* | | if ip = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* | IP-ID | 2 octets, if I = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* | |
* / Outer IP header fields / variable,
* | | if ip2 = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* | |
* / RTP header flags and fields / variable,
* | | if rtp = 1
* ..... ..... ..... ..... ..... ..... ..... .....
*/
proto_item_append_text(ext_ti, " 3");
static int * const ext3_rtp_flags[] = {
&hf_rohc_ext3_s,
&hf_rohc_ext3_r_ts,
&hf_rohc_ext3_tsc,
&hf_rohc_ext3_i,
&hf_rohc_ext3_ip,
&hf_rohc_ext3_rtp,
NULL
};
static int * const ext3_udp_flags[] = {
&hf_rohc_ext3_s,
&hf_rohc_ext3_udp_mode,
&hf_rohc_ext3_i,
&hf_rohc_ext3_ip,
&hf_rohc_ext3_ip2,
NULL
};
guint64 ext3_flags_value = 0;
guint64 ext3_inner_ip_flags_value = 0;
guint64 ext3_outer_ip_flags_value = 0;
/* FLAGS */
proto_tree_add_bitmask_ret_uint64(ext_tree, tvb, offset, hf_rohc_ext3_flags, ett_rohc_ext3_flags,
(rohc_cid_context->profile == ROHC_PROFILE_RTP) ? ext3_rtp_flags : ext3_udp_flags,
ENC_BIG_ENDIAN, &ext3_flags_value);
offset++;
if (ext3_flags_value & ROHC_RTP_EXT3_IP_MASK) {
static int * const inner_ip_flags[] = {
&hf_rohc_ext3_inner_tos,
&hf_rohc_ext3_inner_ttl,
&hf_rohc_ext3_inner_df,
&hf_rohc_ext3_inner_pr,
&hf_rohc_ext3_inner_ipx,
&hf_rohc_ext3_inner_nbo,
&hf_rohc_ext3_inner_rnd,
&hf_rohc_ext3_inner_ip2,
NULL
};
/* Inner IP header flags
*
* These correspond to the inner IP header if there are two, and the
* single IP header otherwise.
*
* 0 1 2 3 4 5 6 7
* ..... ..... ..... ..... ..... ..... ..... .....
* | TOS | TTL | DF | PR | IPX | NBO | RND | ip2 | if ip = 1
* ..... ..... ..... ..... ..... ..... ..... .....
*/
proto_tree_add_bitmask_ret_uint64(ext_tree, tvb, offset, hf_rohc_ext3_inner_ip_flags, ett_rohc_ext3_inner_ip_flags, inner_ip_flags, ENC_BIG_ENDIAN, &ext3_inner_ip_flags_value);
rohc_cid_context->rnd = ((ext3_inner_ip_flags_value & ROHC_RTP_EXT3_INNER_RND_MASK) != 0);
offset++;
}
if (ext3_inner_ip_flags_value & ROHC_RTP_EXT3_INNER_IP2_MASK) {
static int * const outer_ip_flags[] = {
&hf_rohc_ext3_outer_tos,
&hf_rohc_ext3_outer_ttl,
&hf_rohc_ext3_outer_df,
&hf_rohc_ext3_outer_pr,
&hf_rohc_ext3_outer_ipx,
&hf_rohc_ext3_outer_nbo,
&hf_rohc_ext3_outer_rnd,
&hf_rohc_ext3_outer_i2,
NULL
};
/* Outer IP header flags
*
* The fields in this part of the Extension 3 header refer to the
* outermost IP header:
*
* 0 1 2 3 4 5 6 7
* ..... ..... ..... ..... ..... ..... ..... .....
* | TOS2| TTL2| DF2 | PR2 |IPX2 |NBO2 |RND2 | I2 | if ip2 = 1
* ..... ..... ..... ..... ..... ..... ..... .....
*/
proto_tree_add_bitmask_ret_uint64(ext_tree, tvb, offset, hf_rohc_ext3_outer_ip_flags, ett_rohc_ext3_outer_ip_flags, outer_ip_flags, ENC_BIG_ENDIAN, &ext3_outer_ip_flags_value);
/* TODO Update rnd when adding support for inner/outer behavior */
rohc_cid_context->rnd = ((ext3_outer_ip_flags_value & ROHC_RTP_EXT3_OUTER_RND_MASK) != 0);
offset++;
}
if (ext3_flags_value & ROHC_RTP_EXT3_S_MASK) {
proto_tree_add_bits_item(ext_tree, hf_rohc_comp_sn, tvb, (offset<<3), 8, ENC_BIG_ENDIAN);
offset++;
}
if (ext3_flags_value & ROHC_RTP_EXT3_R_TS_MASK) {
guint8 val_len = 0;
get_self_describing_var_len_val(tvb, ext_tree, offset, hf_rohc_ts, &val_len);
offset += val_len;
}
if (ext3_flags_value & ROHC_RTP_EXT3_IP_MASK) {
/* Inner IP header fields
*
* ..... ..... ..... ..... ..... ..... ..... .....
* | Type of Service/Traffic Class | if TOS = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* | Time to Live/Hop Limit | if TTL = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* | Protocol/Next Header | if PR = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* / IP extension headers / variable,
* ..... ..... ..... ..... ..... ..... ..... ..... if IPX = 1
*/
if (ext3_inner_ip_flags_value & ROHC_RTP_EXT3_INNER_TOS_MASK) {
proto_tree_add_item(ext_tree, hf_rohc_rtp_tos, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
}
if (ext3_inner_ip_flags_value & ROHC_RTP_EXT3_INNER_TTL_MASK) {
proto_tree_add_item(ext_tree, hf_rohc_rtp_ttl, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
}
if (ext3_inner_ip_flags_value & ROHC_RTP_EXT3_INNER_PR_MASK) {
proto_tree_add_item(ext_tree, hf_rohc_ip_protocol, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
}
if (ext3_inner_ip_flags_value & ROHC_RTP_EXT3_INNER_IPX_MASK) {
offset = dissect_compressed_list(0, pinfo, ext_tree, tvb, offset);
}
}
if (ext3_flags_value & ROHC_RTP_EXT3_I_MASK) {
proto_tree_add_item(ext_tree, hf_rohc_comp_ip_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
}
if (ext3_inner_ip_flags_value & ROHC_RTP_EXT3_INNER_IP2_MASK) {
/* Outer IP header fields
*
* ..... ..... ..... ..... ..... ..... ..... .....
* | Type of Service/Traffic Class | if TOS2 = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* | Time to Live/Hop Limit | if TTL2 = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* | Protocol/Next Header | if PR2 = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* / IP extension header(s) / variable,
* ..... ..... ..... ..... ..... ..... ..... ..... if IPX2 = 1
* | IP-ID | 2 octets,
* ..... ..... ..... ..... ..... ..... ..... ..... if I2 = 1
*/
if (ext3_outer_ip_flags_value & ROHC_RTP_EXT3_OUTER_TOS_MASK) {
proto_tree_add_item(ext_tree, hf_rohc_rtp_tos, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
}
if (ext3_outer_ip_flags_value & ROHC_RTP_EXT3_OUTER_TTL_MASK) {
proto_tree_add_item(ext_tree, hf_rohc_rtp_ttl, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
}
if (ext3_outer_ip_flags_value & ROHC_RTP_EXT3_OUTER_PR_MASK) {
proto_tree_add_item(ext_tree, hf_rohc_ip_protocol, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
}
if (ext3_outer_ip_flags_value & ROHC_RTP_EXT3_OUTER_IPX_MASK) {
offset = dissect_compressed_list(0, pinfo, ext_tree, tvb, offset);
}
if (ext3_outer_ip_flags_value & ROHC_RTP_EXT3_OUTER_I2_MASK) {
proto_tree_add_item(ext_tree, hf_rohc_comp_ip_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
}
}
if ((rohc_cid_context->profile == ROHC_PROFILE_RTP) &&
(ext3_flags_value & ROHC_RTP_EXT3_RTP_MASK)) {
guint64 ext3_rtp_flags_value = 0;
static int * const rtp_flags[] = {
&hf_rohc_ext3_rtp_mode,
&hf_rohc_ext3_r_pt,
&hf_rohc_ext3_m,
&hf_rohc_ext3_r_x,
&hf_rohc_ext3_csrc,
&hf_rohc_ext3_tss,
&hf_rohc_ext3_tis,
NULL
};
/* RTP header flags and fields
*
* 0 1 2 3 4 5 6 7
* ..... ..... ..... ..... ..... ..... ..... .....
* | Mode |R-PT | M | R-X |CSRC | TSS | TIS | if rtp = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* | R-P | RTP PT | if R-PT = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* / Compressed CSRC list / if CSRC = 1
* ..... ..... ..... ..... ..... ..... ..... .....
* / TS_STRIDE / 1-4 oct if TSS = 1
* ..... ..... ..... ..... ..... ..... ..... ....
* / TIME_STRIDE (milliseconds) / 1-4 oct if TIS = 1
* ..... ..... ..... ..... ..... ..... ..... .....
*/
proto_tree_add_bitmask_ret_uint64(ext_tree, tvb, offset, hf_rohc_ext3_rtp_flags, ett_rohc_ext3_rtp_flags, rtp_flags, ENC_BIG_ENDIAN, &ext3_rtp_flags_value);
rohc_cid_context->mode = (enum rohc_mode)((ext3_rtp_flags_value & ROHC_RTP_EXT3_RTP_MODE_MASK)>>6);
offset++;
if (ext3_rtp_flags_value & ROHC_RTP_EXT3_R_PT_MASK) {
proto_tree_add_item(ext_tree, hf_rohc_ext3_r_p, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(ext_tree, hf_rohc_rtp_pt, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
}
if (ext3_rtp_flags_value & ROHC_RTP_EXT3_CSRC_MASK) {
offset = dissect_compressed_list(0, pinfo, ext_tree, tvb, offset);
}
if (ext3_rtp_flags_value & ROHC_RTP_EXT3_TSS_MASK) {
guint8 val_len = 0;
get_self_describing_var_len_val(tvb, ext_tree, offset, hf_rohc_rtp_ts_stride, &val_len);
offset += val_len;
}
if (ext3_rtp_flags_value & ROHC_RTP_EXT3_TIS_MASK) {
guint8 val_len = 0;
get_self_describing_var_len_val(tvb, ext_tree, offset, hf_rohc_rtp_time_stride, &val_len);
offset += val_len;
}
}
} else {
proto_tree_add_expert_format(ext_tree, pinfo, &ei_rohc_not_dissected_yet, tvb, offset, -1,
"extension 3 [Not dissected yet for profile %u]", rohc_cid_context->profile);
if (tvb_captured_length_remaining(tvb, offset) > 0)
offset += tvb_captured_length_remaining(tvb, offset);
}
}
proto_item_set_len(ext_ti, offset-start_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) ||
(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_append_str(pinfo->cinfo, COL_INFO, "R-1");
/* Create R-1 subtree */
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_rohc_packet, &ti, "R-1 packet");
/* SN */
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) {
/* UDP Profile */
/* X */
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);
/* IP-ID */
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+1, 7, ENC_BIG_ENDIAN);
} else {
/* RTP Profile */
/* M */
proto_tree_add_bits_item(pkt_tree, hf_rohc_rtp_m, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
/* X */
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);
/* TS */
proto_tree_add_bits_item(pkt_tree, hf_rohc_ts, tvb, (offset<<3)+2, 6, ENC_BIG_ENDIAN);
}
offset++;
} else {
/* Packet type depends upon value of T bit */
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_append_str(pinfo->cinfo, COL_INFO, "R-1-ID");
/* Create R-1-ID subtree */
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_rohc_packet, &ti, "R-1-ID packet");
} else {
/* R-1-TS
*
* 0 1 2 3 4 5 6 7
* +---+---+---+---+---+---+---+---+
* | 1 0 | SN |
* +===+===+===+===+===+===+===+===+
* | M | X |T=1| TS |
* +---+---+---+---+---+---+---+---+
*/
col_append_str(pinfo->cinfo, COL_INFO, "R-1-TS");
/* Create R-1-TS subtree */
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_rohc_packet, &ti, "R-1-TS packet");
}
/* SN */
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);
/* M */
proto_tree_add_bits_item(pkt_tree, hf_rohc_rtp_m, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
/* X */
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);
/* T */
proto_tree_add_bits_item(pkt_tree, hf_rohc_t, tvb, (offset<<3)+2, 1, ENC_BIG_ENDIAN);
if (t == 0) {
/* IP-ID */
proto_tree_add_bits_item(pkt_tree, hf_rohc_comp_ip_id, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
} else {
/* TS */
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, pinfo, 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) ||
(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_append_str(pinfo->cinfo, COL_INFO, "UO-1");
/* Create subtree */
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_rohc_packet, &ti, "UO-1 packet");
if (rohc_cid_context->profile == ROHC_PROFILE_UDP) {
/* IP-ID */
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 */
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 {
/* RTP Profile */
/* TS */
proto_tree_add_bits_item(pkt_tree, hf_rohc_ts, tvb, (offset<<3)+2, 6, ENC_BIG_ENDIAN);
offset += 1 + val_len;
/* M */
proto_tree_add_bits_item(pkt_tree, hf_rohc_rtp_m, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
/* SN */
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);
/* CRC (common to both) */
proto_tree_add_bits_item(pkt_tree, hf_rohc_crc, tvb, (offset<<3)+5, 3, ENC_BIG_ENDIAN);
offset++;
} else {
/* Type depends upon t bit */
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_append_str(pinfo->cinfo, COL_INFO, "UO-1-ID");
/* UO-1-ID subtree */
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_rohc_packet, &ti, "UO-1-ID packet");
/* T */
proto_tree_add_bits_item(pkt_tree, hf_rohc_t, tvb, (offset<<3)+2, 1, ENC_BIG_ENDIAN);
/* IP-ID */
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 */
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_append_str(pinfo->cinfo, COL_INFO, "UO-1-TS");
/* UO-1-TS subtree */
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_rohc_packet, &ti, "UO-1-TS packet");
/* T */
proto_tree_add_bits_item(pkt_tree, hf_rohc_t, tvb, (offset<<3)+2, 1, ENC_BIG_ENDIAN);
/* TS */
proto_tree_add_bits_item(pkt_tree, hf_rohc_ts, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
offset += 1 + val_len;
/* M */
proto_tree_add_bits_item(pkt_tree, hf_rohc_rtp_m, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
}
/* SN */
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);
/* CRC */
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, pinfo, 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) ||
(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_append_str(pinfo->cinfo, COL_INFO, "UOR-2");
/* UOR-2 subtree */
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_rohc_packet, &ti, "UOR-2 packet");
if (rohc_cid_context->profile == ROHC_PROFILE_UDP) {
/* UDP profile */
/* SN */
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 {
/* RTP profile */
/* TS */
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;
/* M */
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);
/* SN */
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 - common to both */
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);
/* CRC - common to both */
proto_tree_add_bits_item(pkt_tree, hf_rohc_crc, tvb, (offset<<3)+1, 7, ENC_BIG_ENDIAN);
offset++;
} else {
/* Packet type depends upon T bit */
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_append_str(pinfo->cinfo, COL_INFO, "UOR-2-ID");
/* UOR-2-ID subtree */
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_rohc_packet, &ti, "UOR-2-ID packet");
/* IP-ID */
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_append_str(pinfo->cinfo, COL_INFO, "UOR-2-TS");
/* UOR-2-TS subtree */
pkt_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_rohc_packet, &ti, "UOR-2-TS packet");
/* TS */
proto_tree_add_bits_item(pkt_tree, hf_rohc_ts, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
}
offset += 1 + val_len;
/* T - commonto both */
proto_tree_add_bits_item(pkt_tree, hf_rohc_t, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
/* M - common to both */
proto_tree_add_bits_item(pkt_tree, hf_rohc_rtp_m, tvb, (offset<<3)+1, 1, ENC_BIG_ENDIAN);
/* SN - common to both */
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 - common to both */
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);
/* CRC - common to both */
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, pinfo, 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;
/* Look up context using cid */
if (!PINFO_FD_VISITED(pinfo)) {
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(pinfo->pool, 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_expert_format(tree, pinfo, &ei_rohc_profile_not_supported, 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 |
* +---+---+---+---+---+---+---+---+
*
*/
/* 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_expert(tree, pinfo, &ei_rohc_profile_specific, tvb, offset, feedback_data_len);
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 */
/* 0 1 2 3 4 5 6 7
* +---+---+---+---+---+---+---+---+
* |Acktype| Mode | SN |
* +---+---+---+---+---+---+---+---+
* | SN |
* +---+---+---+---+---+---+---+---+
* / Feedback options /
* +---+---+---+---+---+---+---+---+
*/
/* Subtree */
rohc_feedback_tree = proto_tree_add_subtree_format(tree, tvb, offset, feedback_data_len, ett_rohc_feedback, NULL,
"%s profile-specific information",
(rohc_cid_context->profile == ROHC_PROFILE_RTP) ? "RTP" : "UDP");
/* Set mode at first pass? Do we need a new context for the following frames?
*
*/
/* Acktype */
proto_tree_add_item(rohc_feedback_tree, hf_rohc_acktype, tvb, offset, 1, ENC_BIG_ENDIAN);
/* Mode */
rohc_cid_context->mode = (enum rohc_mode)((tvb_get_guint8(tvb,offset) & 0x30)>>4);
proto_tree_add_item(rohc_feedback_tree, hf_rohc_mode, tvb, offset, 1, ENC_BIG_ENDIAN);
/* SN */
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;
/* 0 1 2 3 4 5 6 7
* +---+---+---+---+---+---+---+---+
* | Opt Type | Opt Len |
* +---+---+---+---+---+---+---+---+
* / option data / Opt Len octets
* +---+---+---+---+---+---+---+---+
*/
while (feedback_data_len>0) {
opt = opt_len = tvb_get_guint8(tvb,offset);
opt = opt >> 4;
opt_len = opt_len &0x0f;
/* Opt Type */
ti = proto_tree_add_item(rohc_feedback_tree, hf_rohc_opt_type, tvb, offset, 1, ENC_BIG_ENDIAN);
/* Opt Len */
proto_tree_add_item(rohc_feedback_tree, hf_rohc_opt_len, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
feedback_data_len--;
/* optiona data */
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_item(rohc_feedback_tree, hf_rohc_unknown_option_data, tvb, offset, opt_len, ENC_NA);
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:
rohc_feedback_tree = proto_tree_add_subtree(tree, tvb, offset, feedback_data_len,
ett_rohc_feedback, NULL, "profile-specific information[Not dissected yet]");
proto_tree_add_item(rohc_feedback_tree, hf_rohc_acktype, tvb, offset, 1, ENC_BIG_ENDIAN);
break;
}
}
static 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_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;
/* Create subtree according to profile */
switch (profile) {
case ROHC_PROFILE_UNCOMPRESSED:
sub_tree = proto_tree_add_subtree(tree, tvb, offset, 0, ett_rohc_rtp_dynamic, &item, "Profile 0x0000 Uncompressed");
break;
case ROHC_PROFILE_RTP:
sub_tree = proto_tree_add_subtree(tree, tvb, offset, 0, ett_rohc_rtp_dynamic, &item, "Profile 0x0001 RTP Dynamic Chain");
break;
case ROHC_PROFILE_UDP:
sub_tree = proto_tree_add_subtree(tree, tvb, offset, 0, ett_rohc_rtp_dynamic, &item, "Profile 0x0002 UDP Dynamic Chain");
break;
case ROHC_PROFILE_IP:
sub_tree = proto_tree_add_subtree(tree, tvb, offset, 0, ett_rohc_rtp_dynamic, &item, "Profile 0x0004 IP Dynamic Chain");
break;
default:
proto_tree_add_expert(tree, pinfo, &ei_rohc_profile_not_supported, tvb, offset, 0);
return -1;
}
/* IP dynamic */
/* for all profiles except uncompressed */
if (profile != ROHC_PROFILE_UNCOMPRESSED) {
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;
/* DF */
proto_tree_add_item(dynamic_ipv4_tree, hf_rohc_rtp_df, tvb, offset, 1, ENC_BIG_ENDIAN);
/* RND */
proto_tree_add_item(dynamic_ipv4_tree, hf_rohc_rtp_rnd, tvb, offset, 1, ENC_BIG_ENDIAN);
/* NBO */
proto_tree_add_item(dynamic_ipv4_tree, hf_rohc_rtp_nbo, tvb, offset, 1, ENC_BIG_ENDIAN);
/* Spare */
proto_tree_add_bits_item(dynamic_ipv4_tree, hf_rohc_spare_bits, tvb, (offset<<3)+3, 5, ENC_BIG_ENDIAN);
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);
/* Set proper length for subtree */
proto_item_set_len(root_ti, offset-tree_start_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
* +---+---+---+---+---+---+---+---+
*/
/* Traffic Class */
proto_tree_add_item(sub_tree, hf_rohc_ipv6_tc, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* Hop Limit */
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_expert(sub_tree, pinfo, &ei_rohc_not_dissected_yet, tvb, offset, -1);
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;
/* Checksum */
proto_tree_add_checksum(dynamic_udp_tree, tvb, offset, hf_rohc_dynamic_udp_checksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
offset += 2;
if (profile == ROHC_PROFILE_UDP) {
/* IP-ID 5.11.1 */
proto_tree_add_item(dynamic_udp_tree, hf_rohc_comp_ip_id, 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;
/* V */
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_v, tvb, offset, 1, ENC_BIG_ENDIAN);
/* P */
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_p, tvb, offset, 1, ENC_BIG_ENDIAN);
/* RX */
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_rx, tvb, offset, 1, ENC_BIG_ENDIAN);
/* CC */
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++;
/* M */
proto_tree_add_bits_item(dynamic_rtp_tree, hf_rohc_rtp_m, tvb, (offset<<3), 1, ENC_BIG_ENDIAN);
/* PT */
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_pt, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* RTP Sequence Number */
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;
/* RTP Timestamp (absolute) */
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;
}
/* X */
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_x, tvb, offset, 1, ENC_BIG_ENDIAN);
/* Mode */
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);
/* TIS */
proto_tree_add_item(dynamic_rtp_tree, hf_rohc_rtp_tis, tvb, offset, 1, ENC_BIG_ENDIAN);
/* TSS */
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, *ver_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;
/* Create subtree root according to profile */
switch (profile) {
case ROHC_PROFILE_UNCOMPRESSED:
sub_tree = proto_tree_add_subtree(tree, tvb, offset, 0, ett_rohc_rtp_static, &item, "Profile 0x0000 Uncompressed");
break;
case ROHC_PROFILE_RTP:
sub_tree = proto_tree_add_subtree(tree, tvb, offset, 0, ett_rohc_rtp_static, &item, "Profile 0x0001 RTP Static Chain");
break;
case ROHC_PROFILE_UDP:
sub_tree = proto_tree_add_subtree(tree, tvb, offset, 0, ett_rohc_rtp_static, &item, "Profile 0x0002 UDP Static Chain");
break;
case ROHC_PROFILE_IP:
sub_tree = proto_tree_add_subtree(tree, tvb, offset, 0, ett_rohc_rtp_static, &item, "Profile 0x0004 IP Static Chain");
break;
default:
proto_tree_add_expert(tree, pinfo, &ei_rohc_profile_not_supported, tvb, offset, 0);
return -1;
}
/* IP static*/
/* for all profiles except uncompressed */
if (profile != ROHC_PROFILE_UNCOMPRESSED) {
version = tvb_get_guint8(tvb,offset)>>4;
if (profile == ROHC_PROFILE_IP) {
/* RFC 3843 chapter 3.1; alternate encoding can set IP version field MSB to 1 */
version &= 0x07;
ver_item = proto_tree_add_item(sub_tree, hf_rohc_ip_version_ip_profile, tvb, offset, 1, ENC_BIG_ENDIAN);
} else {
ver_item = 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:
expert_add_info(pinfo, ver_item, &ei_rohc_ip_version);
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;
guint32 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) {
/* UDP Dynamic */
offset = dissect_rohc_ir_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=0x%08x)", 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_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_profile_dynamic(tvb, pinfo, tree, offset, profile, rohc_cid_context);
}
return offset;
} else {
proto_tree_add_expert(sub_tree, pinfo, &ei_rohc_not_dissected_yet, tvb, offset, -1);
}
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 && !is_add_cid) {
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) {
/* 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);
/* D (all profiles?) */
if ((profile==ROHC_PROFILE_RTP) || (profile==ROHC_PROFILE_UDP)) {
proto_tree_add_item(ir_tree, hf_rohc_d_bit, tvb, x_bit_offset, 1, ENC_BIG_ENDIAN);
}
/* Profile.
* In the IR packet, the profile identifier is abbreviated to the 8 least
* significant bits. It selects the highest-number profile in the
* channel state parameter PROFILES that matches the 8 LSBs given. */
proto_tree_add_item(ir_tree, hf_rohc_profile, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* CRC */
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_VISITED(pinfo)) {
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;
/*ws_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->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 = 0;
/*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->num;
rohc_cid_context->rohc_ip_version = p_rohc_info->rohc_ip_version;
rohc_cid_context->mode = p_rohc_info->mode;
/*ws_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:
/* Just an ip frame */
if (tvb_reported_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_captured_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_captured_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_expert(ir_tree, pinfo, &ei_rohc_profile_specific, tvb, offset, feedback_data_len);
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;
/* Add-CID */
if (!p_rohc_info->large_cid_present && !is_add_cid) {
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) {
/* 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 */
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_VISITED(pinfo)) {
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;
/*ws_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->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 = 0;
rohc_cid_context->large_cid_present = p_rohc_info->large_cid_present;
/*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->num;
rohc_cid_context->mode = p_rohc_info->mode;
/*ws_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);
}
/* CRC */
proto_tree_add_item(ir_tree, hf_rohc_crc, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* Profile specific information */
switch (profile ) {
case ROHC_PROFILE_RTP:
case ROHC_PROFILE_UDP:
offset = dissect_rohc_ir_profile_dynamic(tvb, pinfo, ir_tree, offset, profile, rohc_cid_context);
break;
default:
proto_tree_add_expert(ir_tree, pinfo, &ei_rohc_profile_specific, tvb, offset, feedback_data_len);
break;
}
/* Set length of IR-DYN header */
if (offset != -1) {
proto_item_set_len(ir_item, offset-ir_item_start);
}
return offset;
}
/******************************/
/* Main dissection function. */
static int
dissect_rohc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data /* rohc_info* */)
{
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, 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) {
/* No rohc_info passed in, set some defaults */
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 {
/* Use info passed in */
p_rohc_info = (rohc_info *)data;
/* TODO: contents not referenced again, so why do this? */
memset(&g_rohc_info, 0, sizeof(rohc_info));
}
length = tvb_reported_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, " ");
}
/* Add ROHC root */
ti = proto_tree_add_item(tree, proto_rohc, tvb, 0, -1, ENC_NA);
rohc_tree = proto_item_add_subtree(ti, ett_rohc);
/* Put configuration data into the tree */
conf_tree = proto_tree_add_subtree_format(rohc_tree, tvb, offset, 0, ett_rohc_conf, &item,
"Global Configuration: (%s)",
p_rohc_info->large_cid_present ? "Large CID" : "Small CID");
proto_item_set_generated(item);
/* Look for cid context info attached to frame */
rohc_cid_context = (rohc_cid_context_t*)p_get_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0 /* key */);
if (rohc_cid_context) {
/* Do we have info from an IR frame? */
if (rohc_cid_context->ir_frame_number>0) {
/* Show was configured by IR Packet */
conf_item = proto_tree_add_item(conf_tree, hf_rohc_configured_by_ir_packet, tvb, offset, 0, ENC_NA);
proto_item_set_generated(conf_item);
/* No. of IR setup frame */
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);
/* Any previous IR frame number */
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);
}
/* Profile */
conf_item = proto_tree_add_uint(conf_tree, hf_rohc_ir_profile, tvb, offset, 0, rohc_cid_context->profile);
proto_item_set_generated(conf_item);
col_append_fstr(pinfo->cinfo, COL_INFO, "%s: ", val_to_str_const(rohc_cid_context->profile, rohc_profile_vals, "Unknown"));
/* IP Version number */
conf_item = proto_tree_add_uint(conf_tree, hf_rohc_ir_ip_version, tvb, offset, 0, rohc_cid_context->rohc_ip_version);
proto_item_set_generated(conf_item);
/* IR mode */
if (rohc_cid_context->mode == 0) {
conf_item = proto_tree_add_uint_format_value(conf_tree, hf_rohc_ir_mode, tvb, offset, 0, 0, "not known");
proto_item_set_generated(conf_item);
} else {
conf_item = proto_tree_add_uint(conf_tree, hf_rohc_ir_mode, tvb, offset, 0, rohc_cid_context->mode);
proto_item_set_generated(conf_item);
}
} else {
/* No IR frame number stored in context */
conf_item = proto_tree_add_item(conf_tree, hf_rohc_no_configuration_info, tvb, offset, 0, ENC_NA);
proto_item_set_generated(conf_item);
}
}
start_over:
/* N.B. These steps are the procedure described in 5.2.6. ROHC initial decompressor processing */
/* 1) If the first octet is a Padding Octet (11100000),
* strip away all initial Padding Octets and goto next step.
*/
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_item(rohc_tree, hf_rohc_error_packet, tvb, offset, -1, ENC_NA);
return tvb_captured_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).
*/
/* Feedback subtree */
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);
/* Code */
proto_tree_add_item(sub_tree, hf_rohc_code, tvb, offset, 1, ENC_BIG_ENDIAN);
code = oct&0x7;
offset++;
if (code==0) {
/* Separate size field */
size = tvb_get_guint8(tvb,offset);
proto_tree_add_item(sub_tree, hf_rohc_size, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
} else {
/* Size is in code field itself. */
size = code;
}
feedback_data_len = size;
/* CID */
if (!p_rohc_info->large_cid_present) {
/* 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 += size;
if (offset<length) {
goto start_over;
}
proto_item_set_len(p_rohc_info->last_created_item, offset-feedback_start);
return tvb_captured_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 && !is_add_cid) {
item = proto_tree_add_uint(rohc_tree, hf_rohc_small_cid, tvb, 0, 0, cid);
proto_item_set_generated(item);
}
/* Segmentation not supported! */
proto_tree_add_expert(rohc_tree, pinfo, &ei_rohc_desegmentation_not_implemented, tvb, offset, -1);
return tvb_captured_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");
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_captured_length(tvb);
}
payload_tvb = tvb_new_subset_remaining(tvb, offset);
call_data_dissector(payload_tvb, pinfo, rohc_tree);
return tvb_captured_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_captured_length(tvb);
}
payload_tvb = tvb_new_subset_remaining(tvb, offset);
call_data_dissector(payload_tvb, pinfo, rohc_tree);
return tvb_captured_length(tvb);
}
/* First pass - look up or create CID context */
if (!PINFO_FD_VISITED(pinfo)) {
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) {
/* Not found, so initialize new context based upon p_rohc_info */
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;
/*ws_warning("Store dummy data %u",cid);*/
}
/* Store in pinfo */
p_add_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0, rohc_cid_context);
} else {
/* Later passes - get from pinfo */
rohc_cid_context = (rohc_cid_context_t*)p_get_proto_data(wmem_file_scope(), pinfo, proto_rohc, 0);
}
DISSECTOR_ASSERT(rohc_cid_context);
/* Call IP for uncompressed profile */
if (rohc_cid_context->profile==ROHC_PROFILE_UNCOMPRESSED) {
if (rohc_cid_context->large_cid_present) {
/* How long does packet say it is? */
get_self_describing_var_len_val(tvb, rohc_tree, offset+1, hf_rohc_large_cid, &val_len);
/* How many bytes do we actually have? */
gint len = tvb_captured_length_remaining(tvb, offset);
if (len >= val_len) {
len -= val_len;
guint8 *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);
}
/* Call appropriate IP dissector.
TODO: could just call "ip" dissector instead? */
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_data_dissector(next_tvb, pinfo, tree);
}
col_prepend_fstr(pinfo->cinfo, COL_PROTOCOL, "ROHC <");
col_append_str(pinfo->cinfo, COL_PROTOCOL, ">");
return tvb_captured_length(tvb);
}
else if (((oct&0x80)==0x00) &&
((rohc_cid_context->profile==ROHC_PROFILE_RTP) || (rohc_cid_context->profile==ROHC_PROFILE_UDP))) {
/* 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_checksum(rohc_tree, tvb, offset, hf_rohc_udp_checksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
offset += 2;
}
/* Any remainder is undissected data / payload */
payload_tvb = tvb_new_subset_remaining(tvb, offset);
call_data_dissector(payload_tvb, pinfo, tree);
return tvb_captured_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 void
rohc_init_protocol(void)
{
rohc_cid_hash = g_hash_table_new(g_direct_hash, g_direct_equal);
}
static void
rohc_cleanup_protocol(void)
{
g_hash_table_destroy(rohc_cid_hash);
}
void
proto_register_rohc(void)
{
static hf_register_info hf[] =
{
{ &hf_rohc_padding,
{ "Padding","rohc.padding",
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,
{ "Extension","rohc.ext",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, 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_ip_version_ip_profile,
{ "Version","rohc.ip.version",
FT_UINT8, BASE_DEC, VALS(rohc_ip_version_ip_profile_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.dst",
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_profile,
{ "Profile","rohc.ir_profile",
FT_UINT16, BASE_DEC, VALS(rohc_profile_vals), 0x0,
NULL , HFILL
}
},
{ &hf_rohc_ir_ip_version,
{ "IP Version","rohc.ir_ip_version",
FT_UINT8, BASE_DEC, VALS(rohc_ip_version_vals), 0x0,
NULL , HFILL
}
},
{ &hf_rohc_ir_mode,
{ "Mode","rohc.ir_mode",
FT_UINT32, BASE_DEC, VALS(rohc_mode_vals), 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_comp_ip_id2,
{ "Compressed IP-ID2","rohc.comp_ip_id2",
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
}
},
{ &hf_rohc_ext3_flags,
{ "Extension 3 flags","rohc.ext3_flags",
FT_UINT8, BASE_HEX, NULL, ROHC_RTP_EXT3_FLAGS_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_s,
{ "S","rohc.ext3.s",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_S_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_r_ts,
{ "R-TS","rohc.ext3.r-ts",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_R_TS_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_tsc,
{ "Tsc","rohc.ext3.tsc",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_TSC_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_udp_mode,
{ "Mode","rohc.ext3.mode",
FT_UINT8, BASE_DEC, VALS(rohc_mode_vals), ROHC_UDP_EXT3_UDP_MODE_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_i,
{ "I","rohc.ext3.i",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_I_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_ip,
{ "ip","rohc.ext3.ip",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_IP_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_ip2,
{ "ip2","rohc.ext3.ip2",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_UDP_EXT3_IP2_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_rtp,
{ "rtp","rohc.ext3.rtp",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_RTP_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_inner_ip_flags,
{ "Inner IP header flags","rohc.ext3.inner_ip_flags",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL
}
},
{ &hf_rohc_ext3_inner_tos,
{ "TOS","rohc.ext3.tos",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_INNER_TOS_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_inner_ttl,
{ "TTL","rohc.ext3.ttl",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_INNER_TTL_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_inner_df,
{ "DF","rohc.ext3.df",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_INNER_DF_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_inner_pr,
{ "PR","rohc.ext3.pr",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_INNER_PR_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_inner_ipx,
{ "IPX","rohc.ext3.ipx",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_INNER_IPX_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_inner_nbo,
{ "NBO","rohc.ext3.nbo",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_INNER_NBO_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_inner_rnd,
{ "RND","rohc.ext3.rnd",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_INNER_RND_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_inner_ip2,
{ "ip2","rohc.ext3.ip2",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_INNER_IP2_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_outer_ip_flags,
{ "Outer IP header flags","rohc.ext3.outer_ip_flags",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL
}
},
{ &hf_rohc_ext3_outer_tos,
{ "TOS2","rohc.ext3.tos2",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_OUTER_TOS_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_outer_ttl,
{ "TTL2","rohc.ext3.ttl2",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_OUTER_TTL_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_outer_df,
{ "DF2","rohc.ext3.df2",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_OUTER_DF_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_outer_pr,
{ "PR2","rohc.ext3.pr2",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_OUTER_PR_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_outer_ipx,
{ "IPX2","rohc.ext3.ipx2",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_OUTER_IPX_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_outer_nbo,
{ "NBO2","rohc.ext3.nbo2",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_OUTER_NBO_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_outer_rnd,
{ "RND2","rohc.ext3.rnd2",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_OUTER_RND_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_outer_i2,
{ "I2","rohc.ext3.i2",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_OUTER_I2_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_rtp_flags,
{ "RTP header flags","rohc.ext3.rtp_flags",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL
}
},
{ &hf_rohc_ext3_rtp_mode,
{ "Mode","rohc.ext3.mode",
FT_UINT8, BASE_DEC, VALS(rohc_mode_vals), ROHC_RTP_EXT3_RTP_MODE_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_r_pt,
{ "R-PT","rohc.ext3.r_pt",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_R_PT_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_m,
{ "M","rohc.ext3.m",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_M_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_r_x,
{ "R-X","rohc.ext3.r_x",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_R_X_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_csrc,
{ "CSRC","rohc.ext3.csrc",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_CSRC_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_tss,
{ "TSS","rohc.ext3.tss",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_TSS_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_tis,
{ "TIS","rohc.ext3.tis",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_TIS_MASK,
NULL, HFILL
}
},
{ &hf_rohc_ext3_r_p,
{ "R-P","rohc.ext3.r_p",
FT_BOOLEAN, 8, TFS(&tfs_set_notset), ROHC_RTP_EXT3_R_P_MASK,
NULL, HFILL
}
},
/* Generated from convert_proto_tree_add_text.pl */
{ &hf_rohc_unknown_option_data, { "Unknown Option data", "rohc.unknown_option_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_rohc_configured_by_ir_packet, { "Configured by IR packet", "rohc.configured_by_ir_packet", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_rohc_no_configuration_info, { "No configuration info", "rohc.no_configuration_info", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_rohc_error_packet, { "Error packet", "rohc.error_packet", FT_NONE, BASE_NONE, 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,
&ett_rohc_ext,
&ett_rohc_ext3_flags,
&ett_rohc_ext3_inner_ip_flags,
&ett_rohc_ext3_outer_ip_flags,
&ett_rohc_ext3_rtp_flags
};
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 }},
{ &ei_rohc_not_dissected_yet, { "rohc.not_dissected_yet", PI_UNDECODED, PI_WARN, "Not dissected yet", EXPFILL }},
{ &ei_rohc_profile_specific, { "rohc.profile_specific", PI_UNDECODED, PI_WARN, "profile-specific information [Not dissected yet]", EXPFILL }},
{ &ei_rohc_profile_not_supported, { "rohc.profile_not_supported", PI_PROTOCOL, PI_WARN, "Profile not supported", EXPFILL }},
{ &ei_rohc_ip_version, { "rohc.ip.version.unknown", PI_PROTOCOL, PI_WARN, "Error unknown version, only 4 or 6 allowed", EXPFILL }},
{ &ei_rohc_desegmentation_not_implemented, { "rohc.desegmentation_not_implemented", PI_UNDECODED, PI_WARN, "Segment [Desegmentation not implemented yet]", 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 = register_dissector("rohc", dissect_rohc, proto_rohc);
register_init_routine(&rohc_init_protocol);
register_cleanup_routine(&rohc_cleanup_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_add_dependency("ip", proto_rohc);
ipv6_handle = find_dissector_add_dependency("ipv6", proto_rohc);
}
/*
* Editor modelines - https://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:
*/
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