osmocom
/
wireshark
11
0
Fork 1
Code Issues Pull Requests Projects Releases Wiki Activity
wireshark/epan/dissectors/packet-pppoe.c

880 lines
29 KiB
C
Raw Blame History

/* packet-pppoe.c
* Routines for PPP Over Ethernet (PPPoE) packet disassembly (RFC2516)
* Up to date with http://www.iana.org/assignments/pppoe-parameters (2008-04-30)
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include <epan/emem.h>
#include <epan/strutil.h>
#include <epan/etypes.h>
#include <epan/prefs.h>
#include <epan/expert.h>
static int proto_pppoed = -1;
/* Common to session and discovery protocols */
static gint hf_pppoe_version = -1;
static gint hf_pppoe_type = -1;
static gint hf_pppoe_code = -1;
static gint hf_pppoe_session_id = -1;
static gint hf_pppoe_payload_length = -1;
/* Discovery protocol fields */
static gint hf_pppoed_tags = -1;
static gint hf_pppoed_tag = -1;
static gint hf_pppoed_tag_length = -1;
static gint hf_pppoed_tag_unknown_data = -1;
static gint hf_pppoed_tag_service_name = -1;
static gint hf_pppoed_tag_ac_name = -1;
static gint hf_pppoed_tag_host_uniq = -1;
static gint hf_pppoed_tag_ac_cookie = -1;
static gint hf_pppoed_tag_vendor_id = -1;
static gint hf_pppoed_tag_vendor_unspecified = -1;
static gint hf_pppoed_tag_credits = -1;
static gint hf_pppoed_tag_credits_fcn = -1;
static gint hf_pppoed_tag_credits_bcn = -1;
static gint hf_pppoed_tag_metrics = -1;
static gint hf_pppoed_tag_metrics_r = -1;
static gint hf_pppoed_tag_metrics_rlq = -1;
static gint hf_pppoed_tag_metrics_resource = -1;
static gint hf_pppoed_tag_metrics_latency = -1;
static gint hf_pppoed_tag_metrics_curr_drate = -1;
static gint hf_pppoed_tag_metrics_max_drate = -1;
static gint hf_pppoed_tag_mdr_units = -1;
static gint hf_pppoed_tag_cdr_units = -1;
static gint hf_pppoed_tag_seq_num = -1;
static gint hf_pppoed_tag_cred_scale = -1;
static gint hf_pppoed_tag_relay_session_id = -1;
static gint hf_pppoed_tag_hurl = -1;
static gint hf_pppoed_tag_motm = -1;
static gint hf_pppoed_tag_max_payload = -1;
static gint hf_pppoed_tag_ip_route_add = -1;
static gint hf_pppoed_tag_service_name_error = -1;
static gint hf_pppoed_tag_ac_system_error = -1;
static gint hf_pppoed_tag_generic_error = -1;
/* Session protocol fields */
static gint hf_pppoes_tags = -1;
static gint hf_pppoes_tag = -1;
static gint hf_pppoes_tag_credits = -1;
static gint hf_pppoes_tag_credits_fcn = -1;
static gint hf_pppoes_tag_credits_bcn = -1;
/* Session protocol fields */
static gint ett_pppoed = -1;
static gint ett_pppoed_tags = -1;
static int proto_pppoes = -1;
static gint ett_pppoes = -1;
static gint ett_pppoes_tags = -1;
/* PPPoE parent fields */
static int proto_pppoe = -1;
static gint ett_pppoe = -1;
/* Handle for calling for ppp dissector to handle session data */
static dissector_handle_t ppp_handle;
/* Preference for showing discovery tag values and lengths */
static gboolean global_pppoe_show_tags_and_lengths = FALSE;
#define PPPOE_CODE_SESSION 0x00
#define PPPOE_CODE_PADO 0x07
#define PPPOE_CODE_PADI 0x09
#define PPPOE_CODE_PADG 0x0a
#define PPPOE_CODE_PADC 0x0b
#define PPPOE_CODE_PADQ 0x0c
#define PPPOE_CODE_PADR 0x19
#define PPPOE_CODE_PADS 0x65
#define PPPOE_CODE_PADT 0xa7
#define PPPOE_CODE_PADM 0xd3
#define PPPOE_CODE_PADN 0xd4
#define PPPOE_TAG_EOL 0x0000
#define PPPOE_TAG_SVC_NAME 0x0101
#define PPPOE_TAG_AC_NAME 0x0102
#define PPPOE_TAG_HOST_UNIQ 0x0103
#define PPPOE_TAG_AC_COOKIE 0x0104
#define PPPOE_TAG_VENDOR 0x0105
#define PPPOE_TAG_CREDITS 0x0106
#define PPPOE_TAG_METRICS 0x0107
#define PPPOE_TAG_SEQ_NUM 0x0108
#define PPPOE_TAG_CRED_SCALE 0x0109
#define PPPOE_TAG_RELAY_ID 0x0110
#define PPPOE_TAG_HURL 0x0111
#define PPPOE_TAG_MOTM 0x0112
#define PPPOE_TAG_MAX_PAYLD 0x0120
#define PPPOE_TAG_IP_RT_ADD 0x0121
#define PPPOE_TAG_SVC_ERR 0x0201
#define PPPOE_TAG_AC_ERR 0x0202
#define PPPOE_TAG_GENERIC_ERR 0x0203
#define PPPOE_CDR_MASK 0x06
#define PPPOE_MDR_MASK 0x18
#define PPPOE_RCV_ONLY_MASK 0x01
#define PPPOE_SCALE_KBPS 0x00
#define PPPOE_SCALE_MBPS 0x01
#define PPPOE_SCALE_GBPS 0x02
#define PPPOE_SCALE_TBPS 0x03
static const value_string code_vals[] = {
{PPPOE_CODE_SESSION, "Session Data" },
{PPPOE_CODE_PADO, "Active Discovery Offer (PADO)" },
{PPPOE_CODE_PADI, "Active Discovery Initiation (PADI)" },
{PPPOE_CODE_PADG, "Active Discovery Session-Grant (PADG)" },
{PPPOE_CODE_PADC, "Active Discovery Session-Credit Resp.(PADC)" },
{PPPOE_CODE_PADQ, "Active Discovery Quality (PADQ)" },
{PPPOE_CODE_PADR, "Active Discovery Request (PADR)" },
{PPPOE_CODE_PADS, "Active Discovery Session-confirmation (PADS)"},
{PPPOE_CODE_PADT, "Active Discovery Terminate (PADT)" },
{PPPOE_CODE_PADM, "Active Discovery Message (PADM)" },
{PPPOE_CODE_PADN, "Active Discovery Network (PADN)" },
{0, NULL }
};
static const value_string tag_vals[] = {
{PPPOE_TAG_EOL, "End-Of-List" },
{PPPOE_TAG_SVC_NAME, "Service-Name" },
{PPPOE_TAG_AC_NAME, "AC-Name" },
{PPPOE_TAG_HOST_UNIQ, "Host-Uniq" },
{PPPOE_TAG_AC_COOKIE, "AC-Cookie" },
{PPPOE_TAG_VENDOR, "Vendor-Specific" },
{PPPOE_TAG_CREDITS, "Credits" },
{PPPOE_TAG_METRICS, "Metrics" },
{PPPOE_TAG_SEQ_NUM, "Seqence Number" },
{PPPOE_TAG_CRED_SCALE, "Credit Scale Factor"},
{PPPOE_TAG_RELAY_ID, "Relay-Session-Id" },
{PPPOE_TAG_HURL, "HURL" },
{PPPOE_TAG_MOTM, "MOTM" },
{PPPOE_TAG_MAX_PAYLD, "PPP-Max-Payload" },
{PPPOE_TAG_IP_RT_ADD, "IP Route Add" },
{PPPOE_TAG_SVC_ERR, "Service-Name-Error"},
{PPPOE_TAG_AC_ERR, "AC-System-Error" },
{PPPOE_TAG_GENERIC_ERR,"Generic-Error" },
{0, NULL }
};
const value_string datarate_scale_vals[] = {
{PPPOE_SCALE_KBPS, "kilobits per second"},
{PPPOE_SCALE_MBPS, "megabits per second"},
{PPPOE_SCALE_GBPS, "gigabits per second"},
{PPPOE_SCALE_TBPS, "terabits per second"},
{0, NULL }
};
/* Dissect discovery protocol tags */
static void
dissect_pppoe_tags(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree,
int payload_length)
{
guint16 poe_tag;
guint16 poe_tag_length;
int tagstart;
guint16 poe_rsv = 0;
proto_tree *pppoe_tree;
proto_item *ti;
/* Start Decoding Here. */
if (tree)
{
/* Create tags subtree */
ti = proto_tree_add_item(tree, hf_pppoed_tags, tvb, offset, payload_length-6, FALSE);
pppoe_tree = proto_item_add_subtree(ti, ett_pppoed_tags);
tagstart = offset;
/* Loop until all data seen or End-Of-List tag found */
while (tagstart <= payload_length-2)
{
poe_tag = tvb_get_ntohs(tvb, tagstart);
poe_tag_length = tvb_get_ntohs(tvb, tagstart + 2);
/* Tag value and data length */
if (global_pppoe_show_tags_and_lengths)
{
proto_tree_add_item(pppoe_tree, hf_pppoed_tag, tvb, tagstart, 2, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_length, tvb, tagstart+2, 2, FALSE);
}
/* Show tag data */
switch (poe_tag)
{
case PPPOE_TAG_SVC_NAME:
if (poe_tag_length > 0)
{
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_service_name, tvb,
tagstart+4, poe_tag_length, FALSE);
}
break;
case PPPOE_TAG_AC_NAME:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_ac_name, tvb,
tagstart+4, poe_tag_length, FALSE);
/* Show AC-Name in info column */
if (check_col(pinfo->cinfo, COL_INFO))
{
col_append_fstr(pinfo->cinfo, COL_INFO, " AC-Name='%s'",
tvb_get_ephemeral_string(tvb, tagstart+4, poe_tag_length));
}
break;
case PPPOE_TAG_HOST_UNIQ:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_host_uniq, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
case PPPOE_TAG_AC_COOKIE:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_ac_cookie, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
case PPPOE_TAG_VENDOR:
if (poe_tag_length >= 4)
{
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_vendor_id, tvb,
tagstart+4, 4, FALSE);
}
if (poe_tag_length > 4)
{
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_vendor_unspecified, tvb,
tagstart+4+4, poe_tag_length-4, FALSE);
}
break;
case PPPOE_TAG_CREDITS:
if (poe_tag_length == 4)
{
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_credits_fcn, tvb,
tagstart+4, 2, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_credits_bcn, tvb,
tagstart+6, 2, FALSE);
} else {
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_credits, tvb,
tagstart+4, poe_tag_length, FALSE);
}
break;
case PPPOE_TAG_METRICS:
if (poe_tag_length == 10)
{
poe_rsv = tvb_get_ntohs(tvb, tagstart+4);
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_mdr_units, tvb,
tagstart+4, 2, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_cdr_units, tvb,
tagstart+4, 2, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_r, tvb,
tagstart+4, 2, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_rlq, tvb,
tagstart+6, 1, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_resource, tvb,
tagstart+7, 1, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_latency, tvb,
tagstart+8, 2, FALSE);
/* CDR */
ti = proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_curr_drate, tvb,
tagstart+10, 2, FALSE);
switch ((poe_rsv & PPPOE_CDR_MASK) >> 1)
{
case (PPPOE_SCALE_KBPS):
proto_item_append_text(ti, " kbps");
break;
case (PPPOE_SCALE_MBPS):
proto_item_append_text(ti, " mbps");
break;
case (PPPOE_SCALE_GBPS):
proto_item_append_text(ti, " gbps");
break;
case (PPPOE_SCALE_TBPS):
proto_item_append_text(ti, " tbps");
break;
}
/* MDR */
ti = proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_max_drate, tvb,
tagstart+12, 2, FALSE);
switch ((poe_rsv & PPPOE_MDR_MASK) >> 3)
{
case (PPPOE_SCALE_KBPS):
proto_item_append_text(ti, " kbps");
break;
case (PPPOE_SCALE_MBPS):
proto_item_append_text(ti, " mbps");
break;
case (PPPOE_SCALE_GBPS):
proto_item_append_text(ti, " gbps");
break;
case (PPPOE_SCALE_TBPS):
proto_item_append_text(ti, " tbps");
break;
}
} else {
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics, tvb,
tagstart+4, poe_tag_length, FALSE);
}
break;
case PPPOE_TAG_SEQ_NUM:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_seq_num, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
case PPPOE_TAG_CRED_SCALE:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_cred_scale, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
case PPPOE_TAG_RELAY_ID:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_relay_session_id, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
case PPPOE_TAG_HURL:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_hurl, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
case PPPOE_TAG_MOTM:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_motm, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
case PPPOE_TAG_MAX_PAYLD:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_max_payload, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
case PPPOE_TAG_IP_RT_ADD:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_ip_route_add, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
/* These error tag values should be interpreted as a utf-8 unterminated
strings. */
case PPPOE_TAG_SVC_ERR:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_service_name_error, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
case PPPOE_TAG_AC_ERR:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_ac_system_error, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
case PPPOE_TAG_GENERIC_ERR:
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_generic_error, tvb,
tagstart+4, poe_tag_length, FALSE);
break;
/* Get out if see end-of-list tag */
case PPPOE_TAG_EOL:
return;
default:
if (poe_tag_length > 0 )
{
/* Presumably unknown tag;
show tag value if we didn't
do it above */
if (!global_pppoe_show_tags_and_lengths)
{
proto_tree_add_item(pppoe_tree, hf_pppoed_tag, tvb, tagstart, 2, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_length, tvb, tagstart+2, 2, FALSE);
}
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_unknown_data, tvb,
tagstart+4, poe_tag_length, FALSE);
}
}
tagstart += (4 + poe_tag_length);
}
}
}
/* Discovery protocol, i.e. PPP session not yet established */
static void dissect_pppoed(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 pppoe_code;
guint16 reported_payload_length;
proto_tree *pppoe_tree = NULL;
proto_item *ti;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, "PPPoED");
}
if (check_col(pinfo->cinfo, COL_INFO))
{
col_clear(pinfo->cinfo, COL_INFO);
}
/* Start Decoding Here. */
pppoe_code = tvb_get_guint8(tvb, 1);
if (check_col(pinfo->cinfo, COL_INFO))
{
col_append_str(pinfo->cinfo, COL_INFO, val_to_str(pppoe_code, code_vals, "Unknown"));
}
/* Read length of payload */
reported_payload_length = tvb_get_ntohs(tvb, 4);
if (tree)
{
ti = proto_tree_add_item(tree, proto_pppoed, tvb, 0, reported_payload_length+6, FALSE);
pppoe_tree = proto_item_add_subtree(ti, ett_pppoed);
/* Dissect fixed fields */
proto_tree_add_item(pppoe_tree, hf_pppoe_version, tvb, 0, 1, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoe_type, tvb, 0, 1, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoe_code, tvb, 1, 1, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoe_session_id, tvb, 2, 2, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoe_payload_length, tvb, 4, 2, FALSE);
}
/* Now dissect any tags */
if (reported_payload_length > 0)
{
dissect_pppoe_tags(tvb, pinfo, 6, pppoe_tree, 6+reported_payload_length);
}
}
void proto_register_pppoed(void)
{
static hf_register_info hf[] =
{
/* Discovery tag fields */
{ &hf_pppoed_tags,
{ "PPPoE Tags", "pppoed.tags", FT_NONE, BASE_NONE,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag,
{ "Tag", "pppoed.tag", FT_UINT16, BASE_HEX,
VALS(tag_vals), 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_length,
{ "Tag Length", "pppoed.tag_length", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_unknown_data,
{ "Unknown Data", "pppoed.tag.unknown_data", FT_BYTES, BASE_NONE,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_service_name,
{ "Service-Name", "pppoed.tags.service_name", FT_STRING, BASE_NONE,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_ac_name,
{ "AC-Name", "pppoed.tags.ac_name", FT_STRING, BASE_NONE,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_host_uniq,
{ "Host-Uniq", "pppoed.tags.host_uniq", FT_BYTES, BASE_NONE,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_ac_cookie,
{ "AC-Cookie", "pppoed.tags.ac_cookie", FT_BYTES, BASE_NONE,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_vendor_id,
{ "Vendor id", "pppoed.tags.vendor_id", FT_UINT32, BASE_HEX,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_vendor_unspecified,
{ "Vendor unspecified", "pppoed.tags.vendor_unspecified", FT_BYTES, BASE_HEX,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_credits,
{ "Credits", "pppoed.tags.credits", FT_BYTES, BASE_HEX,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_credits_fcn,
{ "FCN", "pppoed.tags.credits.fcn", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_credits_bcn,
{ "BCN", "pppoed.tags.credits.bcn", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_metrics,
{ "Metrics", "pppoed.tags.metrics", FT_BYTES, BASE_HEX,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_metrics_r,
{ "Receive Only", "pppoed.tags.metrics.r", FT_BOOLEAN, 16,
NULL, PPPOE_RCV_ONLY_MASK, "", HFILL
}
},
{ &hf_pppoed_tag_mdr_units,
{ "MDR Units", "pppoed.tags.metrics.mdr_units", FT_UINT16, BASE_HEX,
VALS(datarate_scale_vals), PPPOE_MDR_MASK, "", HFILL
}
},
{ &hf_pppoed_tag_cdr_units,
{ "CDR Units", "pppoed.tags.metrics.cdr_units", FT_UINT16, BASE_HEX,
VALS(datarate_scale_vals), PPPOE_CDR_MASK, "", HFILL
}
},
{ &hf_pppoed_tag_metrics_rlq,
{ "Relative Link Quality", "pppoed.tags.metrics.rlq", FT_UINT8, BASE_DEC,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_metrics_resource,
{ "Resource", "pppoed.tags.metrics.resource", FT_UINT8, BASE_DEC,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_metrics_latency,
{ "Latency", "pppoed.tags.metrics.latency", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_metrics_curr_drate,
{ "Curr. datarate", "pppoed.tags.metrics.curr_drate", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_metrics_max_drate,
{ "Max. datarate", "pppoed.tags.metrics.max_drate", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_seq_num,
{ "Sequence Number", "pppoed.tags.seq_num", FT_UINT16, BASE_HEX,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_cred_scale,
{ "Credit Scale Factor", "pppoed.tags.credit_scale", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_relay_session_id,
{ "Relay-Session-Id", "pppoed.tags.relay_session_id", FT_BYTES, BASE_NONE,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_hurl,
{ "HURL", "pppoed.tags.hurl", FT_BYTES, BASE_HEX,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_motm,
{ "MOTM", "pppoed.tags.motm", FT_BYTES, BASE_HEX,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_max_payload,
{ "PPP Max Palyload", "pppoed.tags.max_payload", FT_BYTES, BASE_HEX,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_ip_route_add,
{ "IP Route Add", "pppoed.tags.ip_route_add", FT_BYTES, BASE_HEX,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_service_name_error,
{ "Service-Name-Error", "pppoed.tags.service_name_error", FT_STRING, BASE_NONE,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_ac_system_error,
{ "AC-System-Error", "pppoed.tags.ac_system_error", FT_STRING, BASE_NONE,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoed_tag_generic_error,
{ "Generic-Error", "pppoed.tags.generic_error", FT_STRING, BASE_NONE,
NULL, 0x0, "", HFILL
}
}
};
static gint *ett[] = {
&ett_pppoed,
&ett_pppoed_tags
};
module_t *pppoed_module;
/* Register protocol and fields */
proto_pppoed = proto_register_protocol("PPP-over-Ethernet Discovery",
"PPPoED", "pppoed");
proto_register_subtree_array(ett, array_length(ett));
proto_register_field_array(proto_pppoed, hf, array_length(hf));
/* Preference setting */
pppoed_module = prefs_register_protocol(proto_pppoed, NULL);
prefs_register_bool_preference(pppoed_module, "show_tags_and_lengths",
"Show tag values and lengths",
"Show values of tags and lengths of data fields",
&global_pppoe_show_tags_and_lengths);
}
void proto_reg_handoff_pppoed(void)
{
dissector_handle_t pppoed_handle;
pppoed_handle = create_dissector_handle(dissect_pppoed, proto_pppoed);
dissector_add("ethertype", ETHERTYPE_PPPOED, pppoed_handle);
}
/* Session protocol, i.e. PPP session established */
static void dissect_pppoes(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 pppoe_code;
guint16 pppoe_session_id;
guint16 reported_payload_length;
guint16 poe_tag;
guint16 poe_tag_length;
gint actual_payload_length;
gint length, reported_length;
gint credit_offset = 0, tagstart = 0;
proto_tree *pppoe_tree;
proto_item *ti = NULL;
tvbuff_t *next_tvb;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
{
col_set_str(pinfo->cinfo,COL_PROTOCOL, "PPPoES");
}
if (check_col(pinfo->cinfo,COL_INFO))
{
col_clear(pinfo->cinfo,COL_INFO);
}
/* Start Decoding Here. */
pppoe_code = tvb_get_guint8(tvb, 1);
if (check_col(pinfo->cinfo,COL_INFO))
{
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(pppoe_code, code_vals, "Unknown"));
}
pppoe_session_id = tvb_get_ntohs(tvb, 2);
reported_payload_length = tvb_get_ntohs(tvb, 4);
actual_payload_length = tvb_reported_length_remaining(tvb, 6);
if (tree)
{
ti = proto_tree_add_item(tree, proto_pppoes, tvb, 0, 6, FALSE);
pppoe_tree = proto_item_add_subtree(ti, ett_pppoe);
proto_tree_add_item(pppoe_tree, hf_pppoe_version, tvb, 0, 1, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoe_type, tvb, 0, 1, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoe_code, tvb, 1, 1, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoe_session_id, tvb, 2, 2, FALSE);
ti = proto_tree_add_item(pppoe_tree, hf_pppoe_payload_length, tvb, 4, 2, FALSE);
if (PPPOE_TAG_CREDITS == tvb_get_ntohs(tvb, 6))
{
tagstart = 6;
poe_tag = tvb_get_ntohs(tvb, tagstart);
poe_tag_length = tvb_get_ntohs(tvb, tagstart + 2);
/* Create tags subtree */
ti = proto_tree_add_item(pppoe_tree, hf_pppoes_tags, tvb, tagstart, 8, FALSE);
pppoe_tree = proto_item_add_subtree(ti, ett_pppoes_tags);
/* Show tag data */
if (poe_tag_length == 4)
{
proto_tree_add_item(pppoe_tree, hf_pppoes_tag_credits_fcn, tvb,
tagstart+4, 2, FALSE);
proto_tree_add_item(pppoe_tree, hf_pppoes_tag_credits_bcn, tvb,
tagstart+6, 2, FALSE);
} else {
proto_tree_add_item(pppoe_tree, hf_pppoed_tag_credits, tvb,
tagstart+4, poe_tag_length, FALSE);
}
credit_offset = 8;
}
}
/*
* The only reason why the payload length from the header
* should differ from the remaining data in the packet
* would be if the total packet length, including Ethernet
* CRC, were < 64 bytes, so that padding was required.
*
* That means that you have 14 bytes of Ethernet header,
* 4 bytes of FCS, and fewer than 46 bytes of PPPoE packet.
*
* If that's not the case, we report a difference between
* the payload length in the packet, and the amount of
* data following the PPPoE header, as an error.
*/
if (tvb_reported_length(tvb) > 46 &&
reported_payload_length != actual_payload_length) {
proto_item_append_text(ti, " [incorrect, should be %u]",
actual_payload_length);
expert_add_info_format(pinfo, ti, PI_MALFORMED,
PI_WARN, "Possible bad payload length %u != %u",
reported_payload_length, actual_payload_length);
}
/*
* Construct a tvbuff containing the PPP packet.
*/
length = tvb_length_remaining(tvb, 6);
reported_length = tvb_reported_length_remaining(tvb, 6);
DISSECTOR_ASSERT(length >= 0);
DISSECTOR_ASSERT(reported_length >= 0);
if (length > reported_length)
length = reported_length;
if ((guint)length > reported_payload_length)
length = reported_payload_length;
if ((guint)reported_length > reported_payload_length)
reported_length = reported_payload_length;
next_tvb = tvb_new_subset(tvb,(6 + credit_offset),
(length - credit_offset),
(reported_length - credit_offset));
call_dissector(ppp_handle,next_tvb,pinfo,tree);
}
void proto_register_pppoes(void)
{
static hf_register_info hf[] =
{
{ &hf_pppoes_tags,
{ "PPPoE Tags", "pppoes.tags", FT_NONE, BASE_NONE,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoes_tag,
{ "Tag", "pppoes.tag", FT_UINT16, BASE_HEX,
VALS(tag_vals), 0x0, "", HFILL
}
},
{ &hf_pppoes_tag_credits,
{ "Credits", "pppoes.tags.credits", FT_BYTES, BASE_HEX,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoes_tag_credits_fcn,
{ "FCN", "pppoes.tags.credits.fcn", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoes_tag_credits_bcn,
{ "BCN", "pppoes.tags.credits.bcn", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL
}
}
};
static gint *ett[] = {
&ett_pppoes,
&ett_pppoes_tags
};
/* Register protocol */
proto_pppoes = proto_register_protocol("PPP-over-Ethernet Session", "PPPoES", "pppoes");
proto_register_subtree_array(ett, array_length(ett));
proto_register_field_array(proto_pppoes, hf, array_length(hf));
}
void proto_register_pppoe(void)
{
static hf_register_info hf[] =
{
/* These fields common to discovery and session protocols */
{ &hf_pppoe_version,
{ "Version", "pppoe.version", FT_UINT8, BASE_DEC,
NULL, 0xf0, "", HFILL
}
},
{ &hf_pppoe_type,
{ "Type", "pppoe.type", FT_UINT8, BASE_DEC,
NULL, 0x0f, "", HFILL
}
},
{ &hf_pppoe_code,
{ "Code", "pppoe.code", FT_UINT8, BASE_HEX,
VALS(code_vals), 0x0, "", HFILL
}
},
{ &hf_pppoe_session_id,
{ "Session ID", "pppoe.session_id", FT_UINT16, BASE_HEX,
NULL, 0x0, "", HFILL
}
},
{ &hf_pppoe_payload_length,
{ "Payload Length", "pppoe.payload_length", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL
}
}
};
static gint *ett[] = {
&ett_pppoe
};
/* Register protocol */
proto_pppoe = proto_register_protocol("PPP-over-Ethernet", "PPPoE", "pppoe");
proto_register_subtree_array(ett, array_length(ett));
proto_register_field_array(proto_pppoe, hf, array_length(hf));
}
void proto_reg_handoff_pppoes(void)
{
dissector_handle_t pppoes_handle =
create_dissector_handle(dissect_pppoes, proto_pppoes);
dissector_add("ethertype", ETHERTYPE_PPPOES, pppoes_handle);
/* Get a handle for the PPP dissector */
ppp_handle = find_dissector("ppp");
}
Reference in New Issue View Git Blame Copy Permalink