2 * Routines for ARP packet disassembly
4 * $Id: packet-pppoe.c,v 1.4 1999/11/16 11:42:48 guy Exp $
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@zing.org>
8 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 #ifdef HAVE_SYS_TYPES_H
31 # include <sys/types.h>
37 static gint ett_pppoed = -1;
38 static gint ett_pppoed_tags = -1;
40 /* For lack of a better source, I made up the following defines. -jsj */
42 #define PPPOE_CODE_SESSION 0x00
43 #define PPPOE_CODE_PADO 0x7
44 #define PPPOE_CODE_PADI 0x9
45 #define PPPOE_CODE_PADR 0x19
46 #define PPPOE_CODE_PADS 0x65
47 #define PPPOE_CODE_PADT 0xa7
49 #define PPPOE_TAG_EOL 0x0000
50 #define PPPOE_TAG_SVC_NAME 0x0101
51 #define PPPOE_TAG_AC_NAME 0x0102
52 #define PPPOE_TAG_HOST_UNIQ 0x0103
53 #define PPPOE_TAG_AC_COOKIE 0x0104
54 #define PPPOE_TAG_VENDOR 0x0105
55 #define PPPOE_TAG_RELAY_ID 0x0110
56 #define PPPOE_TAG_SVC_ERR 0x0201
57 #define PPPOE_TAG_AC_ERR 0x0202
58 #define PPPOE_TAG_GENERIC_ERR 0x0203
61 pppoecode_to_str(guint8 codetype, const char *fmt) {
62 static const value_string code_vals[] = {
63 {PPPOE_CODE_SESSION, "Session Data" },
64 {PPPOE_CODE_PADO, "Active Discovery Offer (PADO)" },
65 {PPPOE_CODE_PADI, "Active Discovery Initiation (PADI)" },
66 {PPPOE_CODE_PADR, "Active Discovery Request (PADR)" },
67 {PPPOE_CODE_PADS, "Active Discovery Session-confirmation (PADS)"},
68 {PPPOE_CODE_PADT, "Active Discovery Terminate (PADT)" },
71 return val_to_str(codetype, code_vals, fmt);
75 pppoetag_to_str(guint16 tag_type, const char *fmt) {
76 static const value_string code_vals[] = {
77 {PPPOE_TAG_EOL, "End-Of-List" },
78 {PPPOE_TAG_SVC_NAME, "Service-Name" },
79 {PPPOE_TAG_AC_NAME, "AC-Name" },
80 {PPPOE_TAG_HOST_UNIQ, "Host-Uniq" },
81 {PPPOE_TAG_AC_COOKIE, "AC-Cookie" },
82 {PPPOE_TAG_VENDOR, "Vendor-Specific" },
83 {PPPOE_TAG_RELAY_ID, "Relay-Session-Id" },
84 {PPPOE_TAG_SVC_ERR, "Service-Name-Error"},
85 {PPPOE_TAG_AC_ERR, "AC-System-Error" },
86 {PPPOE_TAG_GENERIC_ERR,"Generic-Error" },
89 return val_to_str(tag_type, code_vals, fmt);
94 dissect_pppoe_tags(const u_char *pd, int offset, frame_data *fd, proto_tree *tree, int payload_length) {
97 guint16 poe_tag_length;
100 proto_tree *pppoe_tree;
103 /* Start Decoding Here. */
106 ti = proto_tree_add_text(tree,offset,payload_length,"PPPoE Tags");
107 pppoe_tree = proto_item_add_subtree(ti, ett_pppoed_tags);
110 while(tagstart <= payload_length-2 ) {
112 poe_tag = pntohs(&pd[tagstart]);
113 poe_tag_length = pntohs(&pd[tagstart + 2]);
115 proto_tree_add_text(pppoe_tree,tagstart,4,
116 "Tag: %s", pppoetag_to_str(poe_tag,"Unknown (0x%02x)"));
119 case PPPOE_TAG_SVC_NAME:
120 case PPPOE_TAG_AC_NAME:
121 case PPPOE_TAG_SVC_ERR:
122 case PPPOE_TAG_AC_ERR:
123 case PPPOE_TAG_GENERIC_ERR:
124 /* tag value should be interpreted as a utf-8 unterminated string.*/
125 if(poe_tag_length > 0 ) {
126 /* really should do some limit checking here. :( */
127 proto_tree_add_text(pppoe_tree,tagstart+4,poe_tag_length,
128 " String Data: %s", format_text(&pd[tagstart+4],poe_tag_length ));
132 if(poe_tag_length > 0 ) {
133 proto_tree_add_text(pppoe_tree,tagstart+4,poe_tag_length,
134 " Binary Data: (%d bytes)", poe_tag_length );
138 if (poe_tag == PPPOE_TAG_EOL) break;
140 tagstart += 4 + poe_tag_length;
146 dissect_pppoed(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
150 guint16 pppoe_session_id;
151 guint16 pppoe_length;
153 proto_tree *pppoe_tree;
156 /* Start Decoding Here. */
157 pppoe_ver = (guint8) ((pd[offset] >> 4) & 0x0f);
158 pppoe_type = (guint8) (pd[offset] & 0x0f);
159 pppoe_code = (guint8) pd[offset + 1];
160 pppoe_session_id = pntohs(&pd[offset + 2]);
161 pppoe_length = pntohs(&pd[offset + 4]);
163 if (check_col(fd, COL_PROTOCOL)) {
164 col_add_str(fd,COL_PROTOCOL, "PPPoED");
167 if (check_col(fd,COL_INFO)) {
168 col_add_fstr(fd,COL_INFO,pppoecode_to_str(pppoe_code,"Unknown code (0x%02x)"));
172 ti = proto_tree_add_text(tree,offset,pppoe_length+6,"PPPoE Discovery");
173 pppoe_tree = proto_item_add_subtree(ti, ett_pppoed);
174 proto_tree_add_text(pppoe_tree,offset,1,
175 "Version: %d", pppoe_ver);
176 proto_tree_add_text(pppoe_tree,offset,1,
177 "Type: %d", pppoe_type);
178 proto_tree_add_text(pppoe_tree,offset+1,1,
179 "Code: %s", pppoecode_to_str(pppoe_code,"Unknown (0x%02x)"));
180 proto_tree_add_text(pppoe_tree,offset+2,2,
181 "Session ID: %04x", pppoe_session_id);
182 proto_tree_add_text(pppoe_tree,offset+4,2,
183 "Payload Length: %d", pppoe_length);
185 dissect_pppoe_tags(pd,offset+6,fd,tree,offset+6+pppoe_length);
190 dissect_pppoes(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
194 guint16 pppoe_session_id;
195 guint16 pppoe_length;
197 proto_tree *pppoe_tree;
200 /* Start Decoding Here. */
201 pppoe_ver = (guint8) ((pd[offset] >> 4) & 0x0f);
202 pppoe_type = (guint8) (pd[offset] & 0x0f);
203 pppoe_code = (guint8) pd[offset + 1];
204 pppoe_session_id = pntohs(&pd[offset + 2]);
205 pppoe_length = pntohs(&pd[offset + 4]);
207 if (check_col(fd, COL_PROTOCOL)) {
208 col_add_str(fd,COL_PROTOCOL, "PPPoES");
211 if (check_col(fd,COL_INFO)) {
212 col_add_fstr(fd,COL_INFO,pppoecode_to_str(pppoe_code,"Unknown code (0x%02x)"));
216 ti = proto_tree_add_text(tree,offset,pppoe_length+6,"PPPoE Session");
217 pppoe_tree = proto_item_add_subtree(ti, ett_pppoed);
218 proto_tree_add_text(pppoe_tree,offset,1,
219 "Version: %d", pppoe_ver);
220 proto_tree_add_text(pppoe_tree,offset,1,
221 "Type: %d", pppoe_type);
222 proto_tree_add_text(pppoe_tree,offset+1,1,
223 "Code: %s", pppoecode_to_str(pppoe_code,"Unknown (0x%02x)"));
224 proto_tree_add_text(pppoe_tree,offset+2,2,
225 "Session ID: %04x", pppoe_session_id);
226 proto_tree_add_text(pppoe_tree,offset+4,2,
227 "Payload Length: %d", pppoe_length);
229 /* dissect_ppp is apparently done as a 'top level' dissector,
230 * so this doesn't work:
231 * dissect_ppp(pd,offset+6,fd,tree);
232 * Im gonna try fudging it.
235 dissect_payload_ppp(pd,offset+6,fd,tree);
239 proto_register_pppoed(void)
241 static gint *ett[] = {
246 proto_register_subtree_array(ett, array_length(ett));