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wireshark/epan/dissectors/packet-dccp.c

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/* packet-dccp.c
* Routines for Datagram Congestion Control Protocol, "DCCP" dissection:
* it should conform to RFC 4340
*
* Copyright 2005 _FF_
*
* Francesco Fondelli <francesco dot fondelli, gmail dot com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Copied from packet-udp.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* NOTES:
*
* Nov 13, 2006: makes checksum computation dependent
* upon the header CsCov field (cf. RFC 4340, 5.1)
* (Gerrit Renker)
*
* Nov 13, 2006: removes the case where checksums are zero
* (unlike UDP/packet-udp, from which the code stems,
* zero checksums are illegal in DCCP (as in TCP))
* (Gerrit Renker)
*
* Jan 29, 2007: updates the offsets of the timestamps to be
* compliant to (cf. RFC 4342, sec. 13).
* (Gerrit Renker)
*
* Mar 11, 2012: add support for RFC 5596 (DCCP-Listen Packet)
* (Francesco Fondelli)
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/addr_resolv.h>
#include <epan/ipproto.h>
#include <epan/in_cksum.h>
#include <epan/prefs.h>
#include <epan/expert.h>
#include <epan/conversation.h>
#include <epan/tap.h>
#include <wsutil/str_util.h>
#include <wsutil/utf8_entities.h>
#include "packet-dccp.h"
/*
* Some definitions and the dissect_options() logic have been taken
* from Arnaldo Carvalho de Melo's DCCP implementation, thanks!
*/
#define DCCP_GEN_HDR_LEN_NO_X 12 /* generic header length, without extended sequence numbers */
#define DCCP_GEN_HDR_LEN_X 16 /* generic header length, with extended sequence numbers */
#define DCCP_HDR_LEN 16 /* base DCCP header length, with 48 bits seqnums */
#define DCCP_HDR_LEN_MIN 12 /* with 24 bits seqnum */
#define DCCP_HDR_PKT_TYPES_LEN_MAX 12 /* max per packet type extra
* header length
*/
#define DCCP_OPT_LEN_MAX 1008
#define DCCP_HDR_LEN_MAX (DCCP_HDR_LEN + DCCP_HDR_PKT_TYPES_LEN_MAX + \
DCCP_OPT_LEN_MAX)
void proto_register_dccp(void);
void proto_reg_handoff_dccp(void);
/*
* FF: please keep this list in sync with
* http://www.iana.org/assignments/dccp-parameters/dccp-parameters.xml
* Registry Name: 'Packet Types'
*/
static const value_string dccp_packet_type_vals[] = {
{0x0, "Request" },
{0x1, "Response"},
{0x2, "Data" },
{0x3, "Ack" },
{0x4, "DataAck" },
{0x5, "CloseReq"},
{0x6, "Close" },
{0x7, "Reset" },
{0x8, "Sync" },
{0x9, "SyncAck" },
{0xA, "Listen" },
{0xB, "Reserved"},
{0xC, "Reserved"},
{0xD, "Reserved"},
{0xE, "Reserved"},
{0xF, "Reserved"},
{0, NULL }
};
static const value_string dccp_reset_code_vals[] = {
{0x00, "Unspecified" },
{0x01, "Closed" },
{0x02, "Aborted" },
{0x03, "No Connection" },
{0x04, "Packet Error" },
{0x05, "Option Error" },
{0x06, "Mandatory Error" },
{0x07, "Connection Refused"},
{0x08, "Bad Service Code" },
{0x09, "Too Busy" },
{0x0A, "Bad Init Cookie" },
{0x0B, "Aggression Penalty"},
{0x0C, "Reserved" },
{0, NULL }
};
static const range_string dccp_options_rvals[] = {
{0x00, 0x00, "Padding" },
{0x01, 0x01, "Mandatory" },
{0x02, 0x02, "Slow Receiver" },
{0x03, 0x1F, "Reserved"},
{0x20, 0x20, "Change L" },
{0x21, 0x21, "Confirm L"},
{0x22, 0x22, "Change R" },
{0x23, 0x23, "Confirm R"},
{0x24, 0x24, "Init Cookie"},
{0x25, 0x25, "NDP Count"},
{0x26, 0x26, "Ack Vector [Nonce 0]"},
{0x27, 0x27, "Ack Vector [Nonce 1]"},
{0x28, 0x28, "Data Dropped"},
{0x29, 0x29, "Timestamp"},
{0x2A, 0x2A, "Timestamp Echo"},
{0x2B, 0x2B, "Elapsed Time"},
{0x2C, 0x2C, "Data checksum"},
{0x2D, 0x7F, "Reserved"},
{0x80, 0xBF, "CCID option"},
{0xC0, 0xC0, "CCID3 Loss Event Rate"},
{0xC1, 0xC1, "CCID3 Loss Intervals"},
{0xC2, 0xC2, "CCID3 Receive Rate"},
{0xC3, 0xFF, "CCID option"},
{0, 0, NULL}
};
static const range_string dccp_feature_numbers_rvals[] = {
{0x00, 0x00, "Reserved" },
{0x01, 0x01, "Congestion Control ID (CCID)" },
{0x02, 0x02, "Allow Short Seqnums" },
{0x03, 0x03, "Sequence Window" },
{0x04, 0x04, "ECN Incapable" },
{0x05, 0x05, "Ack Ratio" },
{0x06, 0x06, "Send Ack Vector" },
{0x07, 0x07, "Send NDP Count" },
{0x08, 0x08, "Minimum Checksum Coverage" },
{0x09, 0x09, "Check Data Checksum" },
{0x03, 0x7F, "Reserved"},
{0xC0, 0xC0, "Send Loss Event Rate"}, /* CCID3, RFC 4342, 8.5 */
{0xC1, 0xFF, "CCID-specific feature"},
{0, 0, NULL}
};
static int proto_dccp = -1;
static int dccp_tap = -1;
static int hf_dccp_srcport = -1;
static int hf_dccp_dstport = -1;
static int hf_dccp_port = -1;
static int hf_dccp_data_offset = -1;
static int hf_dccp_ccval = -1;
static int hf_dccp_cscov = -1;
static int hf_dccp_checksum = -1;
static int hf_dccp_checksum_status = -1;
static int hf_dccp_res1 = -1;
static int hf_dccp_type = -1;
static int hf_dccp_x = -1;
static int hf_dccp_res2 = -1;
static int hf_dccp_seq = -1;
static int hf_dccp_ack_res = -1;
static int hf_dccp_ack = -1;
static int hf_dccp_service_code = -1;
static int hf_dccp_reset_code = -1;
static int hf_dccp_data1 = -1;
static int hf_dccp_data2 = -1;
static int hf_dccp_data3 = -1;
static int hf_dccp_options = -1;
static int hf_dccp_option_type = -1;
static int hf_dccp_feature_number = -1;
static int hf_dccp_ndp_count = -1;
static int hf_dccp_timestamp = -1;
static int hf_dccp_timestamp_echo = -1;
static int hf_dccp_elapsed_time = -1;
static int hf_dccp_data_checksum = -1;
/* Generated from convert_proto_tree_add_text.pl */
static int hf_dccp_padding = -1;
static int hf_dccp_mandatory = -1;
static int hf_dccp_slow_receiver = -1;
static int hf_dccp_init_cookie = -1;
static int hf_dccp_ack_vector_nonce_0 = -1;
static int hf_dccp_ack_vector_nonce_1 = -1;
static int hf_dccp_data_dropped = -1;
static int hf_dccp_ccid3_loss_event_rate = -1;
static int hf_dccp_ccid3_loss_intervals = -1;
static int hf_dccp_ccid3_receive_rate = -1;
static int hf_dccp_option_reserved = -1;
static int hf_dccp_ccid_option_data = -1;
static int hf_dccp_option_unknown = -1;
static gint ett_dccp = -1;
static gint ett_dccp_options = -1;
static gint ett_dccp_options_item = -1;
static gint ett_dccp_feature = -1;
static expert_field ei_dccp_option_len_bad = EI_INIT;
static expert_field ei_dccp_advertised_header_length_bad = EI_INIT;
static expert_field ei_dccp_packet_type_reserved = EI_INIT;
static dissector_table_t dccp_subdissector_table;
static heur_dissector_list_t heur_subdissector_list;
/* preferences */
static gboolean dccp_summary_in_tree = TRUE;
static gboolean try_heuristic_first = FALSE;
static gboolean dccp_check_checksum = TRUE;
static void
decode_dccp_ports(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, int sport, int dport)
{
tvbuff_t *next_tvb;
int low_port, high_port;
heur_dtbl_entry_t *hdtbl_entry;
next_tvb = tvb_new_subset_remaining(tvb, offset);
/*
* determine if this packet is part of a conversation and call dissector
* for the conversation if available
*/
if (try_conversation_dissector(&pinfo->src, &pinfo->dst, PT_DCCP, sport,
dport, next_tvb, pinfo, tree, NULL)) {
return;
}
if (try_heuristic_first) {
/* do lookup with the heuristic subdissector table */
if (dissector_try_heuristic(heur_subdissector_list, next_tvb, pinfo,
tree, &hdtbl_entry, NULL)) {
return;
}
}
/*
* Do lookups with the subdissector table.
* We try the port number with the lower value first, followed by the
* port number with the higher value. This means that, for packets
* where a dissector is registered for *both* port numbers:
*
* 1) we pick the same dissector for traffic going in both directions;
*
* 2) we prefer the port number that's more likely to be the right
* one (as that prefers well-known ports to reserved ports);
*
* although there is, of course, no guarantee that any such strategy
* will always pick the right port number.
* XXX - we ignore port numbers of 0, as some dissectors use a port
* number of 0 to disable the port.
*/
if (sport > dport) {
low_port = dport;
high_port = sport;
} else {
low_port = sport;
high_port = dport;
}
if (low_port != 0 &&
dissector_try_uint(dccp_subdissector_table, low_port,
next_tvb, pinfo, tree)) {
return;
}
if (high_port != 0 &&
dissector_try_uint(dccp_subdissector_table, high_port,
next_tvb, pinfo, tree)) {
return;
}
if (!try_heuristic_first) {
/* do lookup with the heuristic subdissector table */
if (dissector_try_heuristic(heur_subdissector_list, next_tvb,
pinfo, tree, &hdtbl_entry, NULL)) {
return;
}
}
/* Oh, well, we don't know this; dissect it as data. */
call_data_dissector(next_tvb, pinfo, tree);
}
/*
* decode a variable-length number of nbytes starting at offset. Based on
* a concept by Arnaldo de Melo
*/
static guint64
tvb_get_ntoh_var(tvbuff_t *tvb, gint offset, guint nbytes)
{
const guint8 *ptr;
guint64 value = 0;
ptr = tvb_get_ptr(tvb, offset, nbytes);
if (nbytes > 5)
value += ((guint64) * ptr++) << 40;
if (nbytes > 4)
value += ((guint64) * ptr++) << 32;
if (nbytes > 3)
value += ((guint64) * ptr++) << 24;
if (nbytes > 2)
value += ((guint64) * ptr++) << 16;
if (nbytes > 1)
value += ((guint64) * ptr++) << 8;
if (nbytes > 0)
value += *ptr;
return value;
}
static void
dissect_feature_options(proto_tree *dccp_options_tree, tvbuff_t *tvb,
int offset, guint8 option_len,
guint8 option_type)
{
guint8 feature_number = tvb_get_guint8(tvb, offset);
proto_item *dccp_item;
proto_tree *feature_tree;
int i;
feature_tree =
proto_tree_add_subtree_format(dccp_options_tree, tvb, offset, option_len,
ett_dccp_feature, &dccp_item, "%s(",
rval_to_str_const(option_type, dccp_feature_numbers_rvals, "Unknown feature number"));
proto_tree_add_uint(feature_tree, hf_dccp_feature_number, tvb,
offset, 1, feature_number);
offset++;
option_len--;
/*
* decode the feature according to whether it is server-priority (list)
* or NN (single number)
*/
switch (feature_number) {
/* Server Priority features (RFC 4340, 6.3.1) */
case 1: /* Congestion Control ID (CCID); fall through */
case 2: /* Allow Short Seqnums; fall through */
case 4: /* ECN Incapable; fall through */
case 6: /* Send Ack Vector; fall through */
case 7: /* Send NDP Count; fall through */
case 8: /* Minimum Checksum Coverage; fall through */
case 9: /* Check Data Checksum; fall through */
case 192: /* Send Loss Event Rate, RFC 4342, section 8.4 */
for (i = 0; i < option_len; i++)
proto_item_append_text(dccp_item, "%s %d", i ? "," : "",
tvb_get_guint8(tvb,
offset + i));
break;
/* Non-negotiable features (RFC 4340, 6.3.2) */
case 3: /* Sequence Window; fall through */
case 5: /* Ack Ratio */
if (option_len > 0) /* could be empty Confirm */
proto_item_append_text(dccp_item, " %" G_GINT64_MODIFIER "u",
tvb_get_ntoh_var(tvb, offset, option_len));
break;
/* Reserved, specific, or unknown features */
default:
proto_item_append_text(dccp_item, "%d", feature_number);
break;
}
proto_item_append_text(dccp_item, ")");
}
/*
* This function dissects DCCP options
*/
static void
dissect_options(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *dccp_options_tree, proto_tree *tree _U_,
e_dccphdr *dccph _U_,
int offset_start,
int offset_end)
{
/*
* if here I'm sure there is at least offset_end - offset_start bytes
* in tvb and it should be options
*/
int offset = offset_start;
guint8 option_type = 0;
guint8 option_len = 0;
guint32 p;
proto_item *option_item;
proto_tree *option_tree;
while (offset < offset_end) {
/* first byte is the option type */
option_type = tvb_get_guint8(tvb, offset);
option_item =
proto_tree_add_uint(dccp_options_tree, hf_dccp_option_type, tvb,
offset,
1,
option_type);
if (option_type >= 32) { /* variable length options */
option_len = tvb_get_guint8(tvb, offset+1);
if (option_len < 2) {
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
"Option length incorrect, must be >= 2");
return;
}
proto_item_set_len(option_item, option_len);
/* Remove the type and length fields out of length */
offset += 2;
option_len -= 2;
} else { /* 1byte options */
option_len = 1;
}
option_tree = proto_item_add_subtree(option_item, ett_dccp_options_item);
switch (option_type) {
case 0:
proto_tree_add_item(option_tree, hf_dccp_padding, tvb, offset, option_len, ENC_NA);
break;
case 1:
proto_tree_add_item(option_tree, hf_dccp_mandatory, tvb, offset, option_len, ENC_NA);
break;
case 2:
proto_tree_add_item(option_tree, hf_dccp_slow_receiver, tvb, offset, option_len, ENC_NA);
break;
case 32:
case 33:
case 34:
case 35:
dissect_feature_options(option_tree, tvb, offset, option_len,
option_type);
break;
case 36:
proto_tree_add_item(option_tree, hf_dccp_init_cookie, tvb, offset, option_len, ENC_NA);
break;
case 37:
if (option_len > 6)
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
"NDP Count too long (max 6 bytes)");
else
proto_tree_add_uint64(option_tree, hf_dccp_ndp_count, tvb, offset, option_len,
tvb_get_ntoh_var(tvb, offset, option_len));
break;
case 38:
proto_tree_add_item(option_tree, hf_dccp_ack_vector_nonce_0, tvb, offset, option_len, ENC_NA);
break;
case 39:
proto_tree_add_item(option_tree, hf_dccp_ack_vector_nonce_1, tvb, offset, option_len, ENC_NA);
break;
case 40:
proto_tree_add_item(option_tree, hf_dccp_data_dropped, tvb, offset, option_len, ENC_NA);
break;
case 41:
if (option_len == 4)
proto_tree_add_item(option_tree, hf_dccp_timestamp, tvb,
offset, 4, ENC_BIG_ENDIAN);
else
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
"Timestamp too long [%u != 4]", option_len);
break;
case 42:
if (option_len == 4)
proto_tree_add_item(option_tree, hf_dccp_timestamp_echo,
tvb, offset, 4, ENC_BIG_ENDIAN);
else if (option_len == 6) {
proto_tree_add_item(option_tree, hf_dccp_timestamp_echo,
tvb, offset, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(option_tree, hf_dccp_elapsed_time,
tvb, offset + 4, 2, ENC_BIG_ENDIAN);
} else if (option_len == 8) {
proto_tree_add_item(option_tree, hf_dccp_timestamp_echo,
tvb, offset, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(option_tree, hf_dccp_elapsed_time,
tvb, offset + 4, 4, ENC_BIG_ENDIAN);
} else
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
"Wrong Timestamp Echo length");
break;
case 43:
if (option_len == 2)
proto_tree_add_item(option_tree, hf_dccp_elapsed_time,
tvb, offset, 2, ENC_BIG_ENDIAN);
else if (option_len == 4)
proto_tree_add_item(option_tree, hf_dccp_elapsed_time,
tvb, offset, 4, ENC_BIG_ENDIAN);
else
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
"Wrong Elapsed Time length");
break;
case 44:
if (option_len == 4) {
proto_tree_add_item(option_tree, hf_dccp_data_checksum,
tvb, offset, 4, ENC_BIG_ENDIAN);
} else
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
"Wrong Data checksum length");
break;
case 192: /* RFC 4342, 8.5 */
if (option_len == 4) {
p = tvb_get_ntohl(tvb, offset);
/*
* According to the comment in section 8.5 of RFC 4342,
* 0xffffffff can mean zero
*/
if (p == 0xFFFFFFFF)
proto_tree_add_uint_format_value(option_tree, hf_dccp_ccid3_loss_event_rate, tvb, offset,
option_len, p, "0 (or max)");
else
proto_tree_add_uint(option_tree, hf_dccp_ccid3_loss_event_rate, tvb, offset, option_len, p);
} else
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
"Wrong CCID3 Loss Event Rate length");
break;
case 193: /* RFC 4342, 8.6 */
proto_tree_add_item(dccp_options_tree, hf_dccp_ccid3_loss_intervals, tvb, offset, option_len, ENC_NA);
/*
* FIXME: not implemented and apparently not used by any
* implementation so far
*/
break;
case 194: /* RFC 4342, 8.3 */
if (option_len == 4)
proto_tree_add_uint_format_value(option_tree, hf_dccp_ccid3_receive_rate, tvb, offset, option_len,
tvb_get_ntohl(tvb, offset), "%u bytes/sec",
tvb_get_ntohl(tvb, offset));
else
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
"Wrong CCID3 Receive Rate length");
break;
default:
if (((option_type >= 45) && (option_type <= 127)) ||
((option_type >= 3) && (option_type <= 31))) {
proto_tree_add_item(option_tree, hf_dccp_option_reserved, tvb, offset, option_len, ENC_NA);
break;
}
if (option_type >= 128) {
proto_tree_add_bytes_format(option_tree, hf_dccp_ccid_option_data, tvb, offset, option_len,
NULL, "CCID option %d", option_type);
break;
}
/* if here we don't know this option */
proto_tree_add_item(option_tree, hf_dccp_option_unknown, tvb, offset, option_len, ENC_NA);
break;
} /* end switch() */
offset += option_len; /* move offset past the dissected option */
} /* end while() */
}
/*
* compute DCCP checksum coverage according to RFC 4340, section 9
*/
static inline guint
dccp_csum_coverage(const e_dccphdr *dccph, guint len)
{
guint cov;
if (dccph->cscov == 0)
return len;
cov = (dccph->data_offset + dccph->cscov - 1) * (guint)sizeof (guint32);
return (cov > len) ? len : cov;
}
static int
dissect_dccp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_tree *dccp_tree;
proto_tree *dccp_options_tree = NULL;
proto_item *dccp_item = NULL;
proto_item *hidden_item, *offset_item;
vec_t cksum_vec[4];
guint32 phdr[2];
guint offset = 0;
guint len = 0;
guint reported_len = 0;
guint csum_coverage_len;
guint advertised_dccp_header_len = 0;
guint options_len = 0;
e_dccphdr *dccph;
dccph = wmem_new0(wmem_packet_scope(), e_dccphdr);
dccph->sport = tvb_get_ntohs(tvb, offset);
dccph->dport = tvb_get_ntohs(tvb, offset + 2);
copy_address_shallow(&dccph->ip_src, &pinfo->src);
copy_address_shallow(&dccph->ip_dst, &pinfo->dst);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DCCP");
col_clear(pinfo->cinfo, COL_INFO);
col_append_ports(pinfo->cinfo, COL_INFO, PT_DCCP, dccph->sport, dccph->dport);
dccp_item = proto_tree_add_item(tree, proto_dccp, tvb, offset, -1, ENC_NA);
if (dccp_summary_in_tree) {
proto_item_append_text(dccp_item, ", Src Port: %s, Dst Port: %s",
port_with_resolution_to_str(wmem_packet_scope(), PT_DCCP, dccph->sport),
port_with_resolution_to_str(wmem_packet_scope(), PT_DCCP, dccph->dport));
}
dccp_tree = proto_item_add_subtree(dccp_item, ett_dccp);
proto_tree_add_item(dccp_tree, hf_dccp_srcport, tvb, offset, 2, ENC_BIG_ENDIAN);
hidden_item = proto_tree_add_item(dccp_tree, hf_dccp_port, tvb, offset, 2, ENC_BIG_ENDIAN);
PROTO_ITEM_SET_HIDDEN(hidden_item);
offset += 2;
proto_tree_add_item(dccp_tree, hf_dccp_dstport, tvb, offset, 2, ENC_BIG_ENDIAN);
hidden_item = proto_tree_add_item(dccp_tree, hf_dccp_port, tvb, offset, 2, ENC_BIG_ENDIAN);
PROTO_ITEM_SET_HIDDEN(hidden_item);
offset += 2;
/*
* update pinfo structure. I guess I have to do it, because this
* is a transport protocol dissector.
*/
pinfo->ptype = PT_DCCP;
pinfo->srcport = dccph->sport;
pinfo->destport = dccph->dport;
dccph->data_offset = tvb_get_guint8(tvb, offset);
advertised_dccp_header_len = dccph->data_offset * 4;
offset_item = proto_tree_add_uint(dccp_tree, hf_dccp_data_offset, tvb, offset, 1,
dccph->data_offset);
offset += 1;
dccph->cscov = tvb_get_guint8(tvb, offset) & 0x0F;
dccph->ccval = tvb_get_guint8(tvb, offset) & 0xF0;
dccph->ccval >>= 4;
proto_tree_add_uint(dccp_tree, hf_dccp_ccval, tvb, offset, 1,
dccph->ccval);
proto_tree_add_uint(dccp_tree, hf_dccp_cscov, tvb, offset, 1,
dccph->cscov);
offset += 1;
dccph->checksum = tvb_get_ntohs(tvb, offset);
/*
* checksum analysis taken from packet-udp (difference: mandatory
* checksums in DCCP)
*/
reported_len = tvb_reported_length(tvb);
len = tvb_captured_length(tvb);
csum_coverage_len = dccp_csum_coverage(dccph, reported_len);
if (dccp_check_checksum && !pinfo->fragmented && len >= csum_coverage_len) {
/* We're supposed to check the checksum, and the packet isn't part
* of a fragmented datagram and isn't truncated, so we can checksum it.
* XXX - make a bigger scatter-gather list once we do fragment
* reassembly? */
/* Set up the fields of the pseudo-header. */
SET_CKSUM_VEC_PTR(cksum_vec[0], (const guint8 *)pinfo->src.data, pinfo->src.len);
SET_CKSUM_VEC_PTR(cksum_vec[1], (const guint8 *)pinfo->dst.data, pinfo->dst.len);
switch (pinfo->src.type) {
case AT_IPv4:
phdr[0] = g_htonl((IP_PROTO_DCCP << 16) + reported_len);
SET_CKSUM_VEC_PTR(cksum_vec[2], (const guint8 *) &phdr, 4);
break;
case AT_IPv6:
phdr[0] = g_htonl(reported_len);
phdr[1] = g_htonl(IP_PROTO_DCCP);
SET_CKSUM_VEC_PTR(cksum_vec[2], (const guint8 *) &phdr, 8);
break;
default:
/* DCCP runs only atop IPv4 and IPv6... */
DISSECTOR_ASSERT_NOT_REACHED();
break;
}
SET_CKSUM_VEC_TVB(cksum_vec[3], tvb, 0, csum_coverage_len);
proto_tree_add_checksum(dccp_tree, tvb, offset, hf_dccp_checksum, hf_dccp_checksum_status, NULL, pinfo, in_cksum(&cksum_vec[0], 4),
ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY|PROTO_CHECKSUM_IN_CKSUM);
} else {
proto_tree_add_checksum(dccp_tree, tvb, offset, hf_dccp_checksum, hf_dccp_checksum_status, NULL, pinfo, 0,
ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
}
offset += 2;
dccph->reserved1 = tvb_get_guint8(tvb, offset) & 0xE0;
dccph->reserved1 >>= 5;
hidden_item =
proto_tree_add_uint(dccp_tree, hf_dccp_res1, tvb, offset, 1,
dccph->reserved1);
PROTO_ITEM_SET_HIDDEN(hidden_item);
dccph->type = tvb_get_guint8(tvb, offset) & 0x1E;
dccph->type >>= 1;
proto_tree_add_uint(dccp_tree, hf_dccp_type, tvb, offset, 1,
dccph->type);
if (dccp_summary_in_tree) {
proto_item_append_text(dccp_item, " [%s]",
val_to_str_const(dccph->type, dccp_packet_type_vals,
"Unknown Type"));
}
col_append_fstr(pinfo->cinfo, COL_INFO, " [%s]",
val_to_str_const(dccph->type, dccp_packet_type_vals,
"Unknown Type"));
dccph->x = tvb_get_guint8(tvb, offset) & 0x01;
proto_tree_add_boolean(dccp_tree, hf_dccp_x, tvb, offset, 1,
dccph->x);
offset += 1;
if (dccph->x) {
if (advertised_dccp_header_len < DCCP_GEN_HDR_LEN_X) {
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
"Advertised header length (%u) is smaller than the minimum (%u)",
advertised_dccp_header_len, DCCP_GEN_HDR_LEN_X);
return tvb_reported_length(tvb);
}
dccph->reserved2 = tvb_get_guint8(tvb, offset);
hidden_item =
proto_tree_add_uint(dccp_tree, hf_dccp_res2, tvb, offset, 1,
dccph->reserved2);
PROTO_ITEM_SET_HIDDEN(hidden_item);
offset += 1;
dccph->seq = tvb_get_ntoh48(tvb, offset);
proto_tree_add_uint64(dccp_tree, hf_dccp_seq, tvb, offset, 6,
dccph->seq);
offset += 6;
} else {
if (advertised_dccp_header_len < DCCP_GEN_HDR_LEN_NO_X) {
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
"Advertised header length (%u) is smaller than the minimum (%u)",
advertised_dccp_header_len, DCCP_GEN_HDR_LEN_NO_X);
return tvb_reported_length(tvb);
}
dccph->seq = tvb_get_ntoh24(tvb, offset);
proto_tree_add_uint64(dccp_tree, hf_dccp_seq, tvb, offset, 3,
dccph->seq);
offset += 3;
}
if (dccp_summary_in_tree) {
proto_item_append_text(dccp_item, " Seq=%" G_GINT64_MODIFIER "u",
dccph->seq);
}
col_append_fstr(pinfo->cinfo, COL_INFO,
" Seq=%" G_GINT64_MODIFIER "u",
dccph->seq);
/* dissecting type dependant additional fields */
switch (dccph->type) {
case 0x0: /* DCCP-Request */
case 0xA: /* DCCP-Listen */
if (advertised_dccp_header_len < offset + 4) {
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
"Advertised header length (%u) is smaller than the minimum (%u) for %s",
advertised_dccp_header_len, offset + 4,
val_to_str(dccph->type, dccp_packet_type_vals, "Unknown (%u)"));
return tvb_reported_length(tvb);
}
dccph->service_code = tvb_get_ntohl(tvb, offset);
if (tree)
proto_tree_add_uint(dccp_tree, hf_dccp_service_code, tvb, offset, 4,
dccph->service_code);
col_append_fstr(pinfo->cinfo, COL_INFO, " (service=%u)",
dccph->service_code);
offset += 4; /* move offset past the service code */
break;
case 0x1: /* DCCP-Response */
if (advertised_dccp_header_len < offset + 12) {
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
"Advertised header length (%u) is smaller than the minimum (%u) for Response",
advertised_dccp_header_len, offset + 12);
return tvb_reported_length(tvb);
}
dccph->ack_reserved = tvb_get_ntohs(tvb, offset);
if (tree) {
hidden_item =
proto_tree_add_uint(dccp_tree, hf_dccp_ack_res, tvb, offset, 2,
dccph->ack_reserved);
PROTO_ITEM_SET_HIDDEN(hidden_item);
}
dccph->ack = tvb_get_ntohs(tvb, offset + 2);
dccph->ack <<= 32;
dccph->ack += tvb_get_ntohl(tvb, offset + 4);
if (tree)
proto_tree_add_uint64(dccp_tree, hf_dccp_ack, tvb, offset + 2, 6,
dccph->ack);
col_append_fstr(pinfo->cinfo, COL_INFO,
" (Ack=%" G_GINT64_MODIFIER "u)",
dccph->ack);
offset += 8; /* move offset past the Acknowledgement Number Subheader */
dccph->service_code = tvb_get_ntohl(tvb, offset);
if (tree)
proto_tree_add_uint(dccp_tree, hf_dccp_service_code, tvb, offset, 4,
dccph->service_code);
col_append_fstr(pinfo->cinfo, COL_INFO, " (service=%u)",
dccph->service_code);
offset += 4; /* move offset past the service code */
break;
case 0x2: /* DCCP-Data */
/* nothing to dissect */
break;
case 0x3: /* DCCP-Ack */
case 0x4: /* DCCP-DataAck */
if (dccph->x) {
if (advertised_dccp_header_len < offset + 8) {
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
"Advertised header length (%u) is smaller than the minimum (%u) for %s",
advertised_dccp_header_len, offset + 8,
val_to_str(dccph->type, dccp_packet_type_vals, "Unknown (%u)"));
return tvb_reported_length(tvb);
}
dccph->ack_reserved = tvb_get_ntohs(tvb, offset);
if (tree) {
hidden_item =
proto_tree_add_uint(dccp_tree, hf_dccp_ack_res, tvb, offset,
2, dccph->ack_reserved);
PROTO_ITEM_SET_HIDDEN(hidden_item);
}
dccph->ack = tvb_get_ntohs(tvb, offset + 2);
dccph->ack <<= 32;
dccph->ack += tvb_get_ntohl(tvb, offset + 4);
if (tree)
proto_tree_add_uint64(dccp_tree, hf_dccp_ack, tvb, offset + 2,
6, dccph->ack);
col_append_fstr(pinfo->cinfo, COL_INFO,
" (Ack=%" G_GINT64_MODIFIER "u)",
dccph->ack);
offset += 8; /* move offset past the Ack Number Subheader */
} else {
if (advertised_dccp_header_len < offset + 4) {
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
"Advertised header length (%u) is smaller than the minimum (%u) for %s",
advertised_dccp_header_len, offset + 4,
val_to_str(dccph->type, dccp_packet_type_vals, "Unknown (%u)"));
return tvb_reported_length(tvb);
}
dccph->ack_reserved = tvb_get_guint8(tvb, offset);
if (tree) {
hidden_item =
proto_tree_add_uint(dccp_tree, hf_dccp_ack_res, tvb, offset,
1, dccph->ack_reserved);
PROTO_ITEM_SET_HIDDEN(hidden_item);
}
dccph->ack = tvb_get_guint8(tvb, offset + 1);
dccph->ack <<= 16;
dccph->ack += tvb_get_ntohs(tvb, offset + 2);
if (tree)
proto_tree_add_uint64(dccp_tree, hf_dccp_ack, tvb, offset + 1,
3, dccph->ack);
col_append_fstr(pinfo->cinfo, COL_INFO,
" (Ack=%" G_GINT64_MODIFIER "u)", dccph->ack);
offset += 4; /* move offset past the Ack. Number Subheader */
}
break;
case 0x7: /* DCCP-Reset */
if (advertised_dccp_header_len < offset + 4) {
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
"Advertised header length (%u) is smaller than the minimum (%u) for Reset",
advertised_dccp_header_len, offset + 4);
return tvb_reported_length(tvb);
}
dccph->ack_reserved = tvb_get_ntohs(tvb, offset);
if (tree) {
hidden_item =
proto_tree_add_uint(dccp_tree, hf_dccp_ack_res, tvb, offset, 2,
dccph->ack_reserved);
PROTO_ITEM_SET_HIDDEN(hidden_item);
}
dccph->ack = tvb_get_ntohs(tvb, offset + 2);
dccph->ack <<= 32;
dccph->ack += tvb_get_ntohl(tvb, offset + 4);
if (tree)
proto_tree_add_uint64(dccp_tree, hf_dccp_ack, tvb, offset + 2, 6,
dccph->ack);
col_append_fstr(pinfo->cinfo, COL_INFO,
" (Ack=%" G_GINT64_MODIFIER "u)", dccph->ack);
offset += 8; /* move offset past the Ack. Number Subheader */
dccph->reset_code = tvb_get_guint8(tvb, offset);
dccph->data1 = tvb_get_guint8(tvb, offset + 1);
dccph->data2 = tvb_get_guint8(tvb, offset + 2);
dccph->data3 = tvb_get_guint8(tvb, offset + 3);
if (tree) {
proto_tree_add_uint(dccp_tree, hf_dccp_reset_code, tvb, offset, 1,
dccph->reset_code);
proto_tree_add_uint(dccp_tree, hf_dccp_data1, tvb, offset + 1, 1,
dccph->data1);
proto_tree_add_uint(dccp_tree, hf_dccp_data2, tvb, offset + 2, 1,
dccph->data2);
proto_tree_add_uint(dccp_tree, hf_dccp_data3, tvb, offset + 3, 1,
dccph->data3);
}
col_append_fstr(pinfo->cinfo, COL_INFO, " (code=%s)",
val_to_str_const(dccph->reset_code, dccp_reset_code_vals,
"Unknown"));
offset += 4; /* move offset past the Reset Code and data123 */
break;
case 0x5: /* DCCP-CloseReq */
case 0x6: /* DCCP-Close */
case 0x8: /* DCCP-Sync */
case 0x9: /* DCCP-SyncAck */
if (advertised_dccp_header_len < offset + 8) {
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
"Advertised header length (%u) is smaller than the minimum (%u) for %s",
advertised_dccp_header_len, offset + 8,
val_to_str(dccph->type, dccp_packet_type_vals, "Unknown (%u)"));
return tvb_reported_length(tvb);
}
dccph->ack_reserved = tvb_get_ntohs(tvb, offset);
if (tree) {
hidden_item =
proto_tree_add_uint(dccp_tree, hf_dccp_ack_res, tvb, offset, 2,
dccph->ack_reserved);
PROTO_ITEM_SET_HIDDEN(hidden_item);
}
dccph->ack = tvb_get_ntohs(tvb, offset + 2);
dccph->ack <<= 32;
dccph->ack += tvb_get_ntohl(tvb, offset + 4);
if (tree)
proto_tree_add_uint64(dccp_tree, hf_dccp_ack, tvb, offset + 2, 6,
dccph->ack);
col_append_fstr(pinfo->cinfo, COL_INFO,
" (Ack=%" G_GINT64_MODIFIER "u)", dccph->ack);
offset += 8; /* move offset past the Ack. Number Subheader */
break;
default:
expert_add_info(pinfo, dccp_item, &ei_dccp_packet_type_reserved);
return tvb_reported_length(tvb);
}
/*
* note: data_offset is the offset from the start of the packet's
* DCCP header to the start of its application data area, in 32-bit words.
*/
if (advertised_dccp_header_len > DCCP_HDR_LEN_MAX) {
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
"Advertised header length (%u) is larger than the maximum (%u)",
advertised_dccp_header_len, DCCP_HDR_LEN_MAX);
return tvb_reported_length(tvb);
}
/*
* The checks done above ensure that
* advertised_dccp_header_len >= offset.
*
* advertised_dccp_header_len - offset is the number of bytes of
* options.
*/
if (advertised_dccp_header_len > offset) {
options_len = advertised_dccp_header_len - offset;
if (dccp_tree) {
dccp_item =
proto_tree_add_none_format(dccp_tree, hf_dccp_options, tvb,
offset,
options_len, "Options: (%u byte%s)",
options_len,
plurality(options_len, "", "s"));
dccp_options_tree = proto_item_add_subtree(dccp_item,
ett_dccp_options);
}
dissect_options(tvb, pinfo, dccp_options_tree, tree, dccph, offset,
offset + options_len);
}
offset += options_len; /* move offset past the Options */
proto_item_set_end(dccp_item, tvb, offset);
/* queuing tap data */
tap_queue_packet(dccp_tap, pinfo, dccph);
/* call sub-dissectors */
if (!pinfo->flags.in_error_pkt || tvb_reported_length_remaining(tvb, offset) > 0)
decode_dccp_ports(tvb, offset, pinfo, tree, dccph->sport, dccph->dport);
return tvb_reported_length(tvb);
}
void
proto_register_dccp(void)
{
module_t *dccp_module;
static hf_register_info hf[] = {
{
&hf_dccp_srcport,
{
"Source Port", "dccp.srcport",
FT_UINT16, BASE_PT_DCCP, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_dstport,
{
"Destination Port", "dccp.dstport",
FT_UINT16, BASE_PT_DCCP, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_port,
{
"Source or Destination Port", "dccp.port",
FT_UINT16, BASE_PT_DCCP, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_data_offset,
{
"Data Offset", "dccp.data_offset",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_ccval,
{
"CCVal", "dccp.ccval",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_cscov,
{
"Checksum Coverage", "dccp.cscov",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_checksum_status,
{
"Checksum Status", "dccp.checksum.status",
FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0,
NULL, HFILL
}
},
{
&hf_dccp_checksum,
{
"Checksum", "dccp.checksum",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_res1,
{
"Reserved", "dccp.res1",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_res2,
{
"Reserved", "dccp.res2",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_type,
{
"Type", "dccp.type",
FT_UINT8, BASE_DEC, VALS(dccp_packet_type_vals), 0x0,
NULL, HFILL
}
},
{
&hf_dccp_x,
{
"Extended Sequence Numbers", "dccp.x",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_seq,
{
"Sequence Number", "dccp.seq",
FT_UINT64, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_ack_res,
{
"Reserved", "dccp.ack_res",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_ack,
{
"Acknowledgement Number", "dccp.ack",
FT_UINT64, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_service_code,
{
"Service Code", "dccp.service_code",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_reset_code,
{
"Reset Code", "dccp.reset_code",
FT_UINT8, BASE_DEC, VALS(dccp_reset_code_vals), 0x0,
NULL, HFILL
}
},
{
&hf_dccp_data1,
{
"Data 1", "dccp.data1",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_data2,
{
"Data 2", "dccp.data2",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_data3,
{
"Data 3", "dccp.data3",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_option_type,
{
"Option Type", "dccp.option_type",
FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(dccp_options_rvals), 0x0,
NULL, HFILL
}
},
{
&hf_dccp_feature_number,
{
"Feature Number", "dccp.feature_number",
FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(dccp_feature_numbers_rvals), 0x0,
NULL, HFILL
}
},
{
&hf_dccp_ndp_count,
{
"NDP Count", "dccp.ndp_count",
FT_UINT64, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_timestamp,
{
"Timestamp", "dccp.timestamp",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_timestamp_echo,
{
"Timestamp Echo", "dccp.timestamp_echo",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_elapsed_time,
{
"Elapsed Time", "dccp.elapsed_time",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_data_checksum,
{
"Data Checksum", "dccp.checksum_data",
FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_dccp_options,
{
"Options", "dccp.options",
FT_NONE, BASE_NONE, NULL, 0x0,
"DCCP Options fields", HFILL
}
},
/* Generated from convert_proto_tree_add_text.pl */
{ &hf_dccp_padding, { "Padding", "dccp.padding", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_mandatory, { "Mandatory", "dccp.mandatory", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_slow_receiver, { "Slow Receiver", "dccp.slow_receiver", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_init_cookie, { "Init Cookie", "dccp.init_cookie", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_ack_vector_nonce_0, { "Ack Vector [Nonce 0]", "dccp.ack_vector.nonce_0", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_ack_vector_nonce_1, { "Ack Vector [Nonce 1]", "dccp.ack_vector.nonce_1", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_data_dropped, { "Data Dropped", "dccp.data_dropped", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_ccid3_loss_event_rate, { "CCID3 Loss Event Rate", "dccp.ccid3_loss_event_rate", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_ccid3_loss_intervals, { "CCID3 Loss Intervals", "dccp.ccid3_loss_intervals", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_ccid3_receive_rate, { "CCID3 Receive Rate", "dccp.ccid3_receive_rate", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_option_reserved, { "Reserved", "dccp.option_reserved", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_ccid_option_data, { "CCID option", "dccp.ccid_option_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_dccp_option_unknown, { "Unknown", "dccp.option_unknown", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
};
static gint *ett[] = {
&ett_dccp,
&ett_dccp_options,
&ett_dccp_options_item,
&ett_dccp_feature
};
static ei_register_info ei[] = {
{ &ei_dccp_option_len_bad, { "dccp.option.len.bad", PI_PROTOCOL, PI_WARN, "Bad option length", EXPFILL }},
{ &ei_dccp_advertised_header_length_bad, { "dccp.advertised_header_length.bad", PI_MALFORMED, PI_ERROR, "Advertised header length bad", EXPFILL }},
{ &ei_dccp_packet_type_reserved, { "dccp.packet_type.reserved", PI_PROTOCOL, PI_WARN, "Reserved packet type: unable to dissect further", EXPFILL }},
};
expert_module_t* expert_dccp;
proto_dccp =
proto_register_protocol("Datagram Congestion Control Protocol", "DCCP",
"dccp");
proto_register_field_array(proto_dccp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_dccp = expert_register_protocol(proto_dccp);
expert_register_field_array(expert_dccp, ei, array_length(ei));
/* subdissectors */
dccp_subdissector_table =
register_dissector_table("dccp.port", "DCCP port", proto_dccp, FT_UINT16,
BASE_DEC, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
heur_subdissector_list = register_heur_dissector_list("dccp", proto_dccp);
/* reg preferences */
dccp_module = prefs_register_protocol(proto_dccp, NULL);
prefs_register_bool_preference(
dccp_module, "summary_in_tree",
"Show DCCP summary in protocol tree",
"Whether the DCCP summary line should be shown in the protocol tree",
&dccp_summary_in_tree);
prefs_register_bool_preference(
dccp_module, "try_heuristic_first",
"Try heuristic sub-dissectors first",
"Try to decode a packet using an heuristic sub-dissector before "
"using a sub-dissector "
"registered to a specific port",
&try_heuristic_first);
prefs_register_bool_preference(
dccp_module, "check_checksum",
"Check the validity of the DCCP checksum when possible",
"Whether to check the validity of the DCCP checksum",
&dccp_check_checksum);
}
void
proto_reg_handoff_dccp(void)
{
dissector_handle_t dccp_handle;
dccp_handle = create_dissector_handle(dissect_dccp, proto_dccp);
dissector_add_uint("ip.proto", IP_PROTO_DCCP, dccp_handle);
dccp_tap = register_tap("dccp");
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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