2 * Routines for raw packet disassembly
4 * $Id: packet-raw.c,v 1.33 2002/02/05 00:09:45 guy Exp $
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@ethereal.com>
9 * This file created and by Mike Hall <mlh@io.com>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #ifdef HAVE_SYS_TYPES_H
32 # include <sys/types.h>
37 #include <epan/packet.h>
38 #include "packet-raw.h"
39 #include "packet-ip.h"
40 #include "packet-ppp.h"
42 static int proto_raw = -1;
43 static gint ett_raw = -1;
45 static const char zeroes[10];
47 static dissector_handle_t ip_handle;
48 static dissector_handle_t ipv6_handle;
49 static dissector_handle_t data_handle;
50 static dissector_handle_t ppp_hdlc_handle;
53 capture_raw(const u_char *pd, int len, packet_counts *ld)
55 /* So far, the only time we get raw connection types are with Linux and
56 * Irix PPP connections. We can't tell what type of data is coming down
57 * the line, so our safest bet is IP. - GCC
60 /* Currently, the Linux 2.1.xxx PPP driver passes back some of the header
61 * sometimes. This check should be removed when 2.2 is out.
63 if (BYTES_ARE_IN_FRAME(0,len,2) && pd[0] == 0xff && pd[1] == 0x03) {
64 capture_ppp_hdlc(pd, 0, len, ld);
66 /* The Linux ISDN driver sends a fake MAC address before the PPP header
67 * on its ippp interfaces... */
68 else if (BYTES_ARE_IN_FRAME(0,len,8) && pd[6] == 0xff && pd[7] == 0x03) {
69 capture_ppp_hdlc(pd, 6, len, ld);
71 /* ...except when it just puts out one byte before the PPP header... */
72 else if (BYTES_ARE_IN_FRAME(0,len,3) && pd[1] == 0xff && pd[2] == 0x03) {
73 capture_ppp_hdlc(pd, 1, len, ld);
75 /* ...and if the connection is currently down, it sends 10 bytes of zeroes
76 * instead of a fake MAC address and PPP header. */
77 else if (BYTES_ARE_IN_FRAME(0,len,10) && memcmp(pd, zeroes, 10) == 0) {
78 capture_ip(pd, 10, len, ld);
82 * OK, is this IPv4 or IPv6?
84 if (BYTES_ARE_IN_FRAME(0,len,1)) {
85 switch (pd[0] & 0xF0) {
89 capture_ip(pd, 0, len, ld);
95 capture_ipv6(pd, 0, len, ld);
104 dissect_raw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
110 /* load the top pane info. This should be overwritten by
111 the next protocol in the stack */
112 if(check_col(pinfo->cinfo, COL_RES_DL_SRC))
113 col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A" );
114 if(check_col(pinfo->cinfo, COL_RES_DL_DST))
115 col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A" );
116 if(check_col(pinfo->cinfo, COL_PROTOCOL))
117 col_set_str(pinfo->cinfo, COL_PROTOCOL, "N/A" );
118 if(check_col(pinfo->cinfo, COL_INFO))
119 col_set_str(pinfo->cinfo, COL_INFO, "Raw packet data" );
121 /* populate a tree in the second pane with the status of the link
124 ti = proto_tree_add_item(tree, proto_raw, tvb, 0, 0, FALSE);
125 fh_tree = proto_item_add_subtree(ti, ett_raw);
126 proto_tree_add_text(fh_tree, tvb, 0, 0, "No link information available");
129 /* So far, the only time we get raw connection types are with Linux and
130 * Irix PPP connections. We can't tell what type of data is coming down
131 * the line, so our safest bet is IP. - GCC
134 /* Currently, the Linux 2.1.xxx PPP driver passes back some of the header
135 * sometimes. This check should be removed when 2.2 is out.
137 if (tvb_get_ntohs(tvb, 0) == 0xff03) {
138 call_dissector(ppp_hdlc_handle, tvb, pinfo, tree);
140 /* The Linux ISDN driver sends a fake MAC address before the PPP header
141 * on its ippp interfaces... */
142 else if (tvb_get_ntohs(tvb, 6) == 0xff03) {
143 next_tvb = tvb_new_subset(tvb, 6, -1, -1);
144 call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
146 /* ...except when it just puts out one byte before the PPP header... */
147 else if (tvb_get_ntohs(tvb, 1) == 0xff03) {
148 next_tvb = tvb_new_subset(tvb, 1, -1, -1);
149 call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
151 /* ...and if the connection is currently down, it sends 10 bytes of zeroes
152 * instead of a fake MAC address and PPP header. */
153 else if (memcmp(tvb_get_ptr(tvb, 0, 10), zeroes, 10) == 0) {
154 next_tvb = tvb_new_subset(tvb, 10, -1, -1);
155 call_dissector(ip_handle, next_tvb, pinfo, tree);
159 * OK, is this IPv4 or IPv6?
161 switch (tvb_get_guint8(tvb, 0) & 0xF0) {
165 call_dissector(ip_handle, tvb, pinfo, tree);
170 call_dissector(ipv6_handle, tvb, pinfo, tree);
174 /* None of the above. */
175 call_dissector(data_handle, tvb, pinfo, tree);
182 proto_register_raw(void)
184 static gint *ett[] = {
188 proto_raw = proto_register_protocol("Raw packet data", "Raw", "raw");
189 proto_register_subtree_array(ett, array_length(ett));
193 proto_reg_handoff_raw(void)
195 dissector_handle_t raw_handle;
198 * Get handles for the IP, IPv6, undissected-data, and
199 * PPP-in-HDLC-like-framing dissectors.
201 ip_handle = find_dissector("ip");
202 ipv6_handle = find_dissector("ipv6");
203 data_handle = find_dissector("data");
204 ppp_hdlc_handle = find_dissector("ppp_hdlc");
205 raw_handle = create_dissector_handle(dissect_raw, proto_raw);
206 dissector_add("wtap_encap", WTAP_ENCAP_RAW_IP, raw_handle);