2 * Routines for raw packet disassembly
4 * $Id: packet-raw.c,v 1.35 2002/08/28 21:00:29 jmayer 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.
33 #include <epan/packet.h>
34 #include "packet-raw.h"
35 #include "packet-ip.h"
36 #include "packet-ppp.h"
38 static int proto_raw = -1;
39 static gint ett_raw = -1;
41 static const char zeroes[10];
43 static dissector_handle_t ip_handle;
44 static dissector_handle_t ipv6_handle;
45 static dissector_handle_t data_handle;
46 static dissector_handle_t ppp_hdlc_handle;
49 capture_raw(const guchar *pd, int len, packet_counts *ld)
51 /* So far, the only time we get raw connection types are with Linux and
52 * Irix PPP connections. We can't tell what type of data is coming down
53 * the line, so our safest bet is IP. - GCC
56 /* Currently, the Linux 2.1.xxx PPP driver passes back some of the header
57 * sometimes. This check should be removed when 2.2 is out.
59 if (BYTES_ARE_IN_FRAME(0,len,2) && pd[0] == 0xff && pd[1] == 0x03) {
60 capture_ppp_hdlc(pd, 0, len, ld);
62 /* The Linux ISDN driver sends a fake MAC address before the PPP header
63 * on its ippp interfaces... */
64 else if (BYTES_ARE_IN_FRAME(0,len,8) && pd[6] == 0xff && pd[7] == 0x03) {
65 capture_ppp_hdlc(pd, 6, len, ld);
67 /* ...except when it just puts out one byte before the PPP header... */
68 else if (BYTES_ARE_IN_FRAME(0,len,3) && pd[1] == 0xff && pd[2] == 0x03) {
69 capture_ppp_hdlc(pd, 1, len, ld);
71 /* ...and if the connection is currently down, it sends 10 bytes of zeroes
72 * instead of a fake MAC address and PPP header. */
73 else if (BYTES_ARE_IN_FRAME(0,len,10) && memcmp(pd, zeroes, 10) == 0) {
74 capture_ip(pd, 10, len, ld);
78 * OK, is this IPv4 or IPv6?
80 if (BYTES_ARE_IN_FRAME(0,len,1)) {
81 switch (pd[0] & 0xF0) {
85 capture_ip(pd, 0, len, ld);
91 capture_ipv6(pd, 0, len, ld);
100 dissect_raw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
106 /* load the top pane info. This should be overwritten by
107 the next protocol in the stack */
108 if(check_col(pinfo->cinfo, COL_RES_DL_SRC))
109 col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A" );
110 if(check_col(pinfo->cinfo, COL_RES_DL_DST))
111 col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A" );
112 if(check_col(pinfo->cinfo, COL_PROTOCOL))
113 col_set_str(pinfo->cinfo, COL_PROTOCOL, "N/A" );
114 if(check_col(pinfo->cinfo, COL_INFO))
115 col_set_str(pinfo->cinfo, COL_INFO, "Raw packet data" );
117 /* populate a tree in the second pane with the status of the link
120 ti = proto_tree_add_item(tree, proto_raw, tvb, 0, 0, FALSE);
121 fh_tree = proto_item_add_subtree(ti, ett_raw);
122 proto_tree_add_text(fh_tree, tvb, 0, 0, "No link information available");
125 /* So far, the only time we get raw connection types are with Linux and
126 * Irix PPP connections. We can't tell what type of data is coming down
127 * the line, so our safest bet is IP. - GCC
130 /* Currently, the Linux 2.1.xxx PPP driver passes back some of the header
131 * sometimes. This check should be removed when 2.2 is out.
133 if (tvb_get_ntohs(tvb, 0) == 0xff03) {
134 call_dissector(ppp_hdlc_handle, tvb, pinfo, tree);
136 /* The Linux ISDN driver sends a fake MAC address before the PPP header
137 * on its ippp interfaces... */
138 else if (tvb_get_ntohs(tvb, 6) == 0xff03) {
139 next_tvb = tvb_new_subset(tvb, 6, -1, -1);
140 call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
142 /* ...except when it just puts out one byte before the PPP header... */
143 else if (tvb_get_ntohs(tvb, 1) == 0xff03) {
144 next_tvb = tvb_new_subset(tvb, 1, -1, -1);
145 call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
147 /* ...and if the connection is currently down, it sends 10 bytes of zeroes
148 * instead of a fake MAC address and PPP header. */
149 else if (memcmp(tvb_get_ptr(tvb, 0, 10), zeroes, 10) == 0) {
150 next_tvb = tvb_new_subset(tvb, 10, -1, -1);
151 call_dissector(ip_handle, next_tvb, pinfo, tree);
155 * OK, is this IPv4 or IPv6?
157 switch (tvb_get_guint8(tvb, 0) & 0xF0) {
161 call_dissector(ip_handle, tvb, pinfo, tree);
166 call_dissector(ipv6_handle, tvb, pinfo, tree);
170 /* None of the above. */
171 call_dissector(data_handle, tvb, pinfo, tree);
178 proto_register_raw(void)
180 static gint *ett[] = {
184 proto_raw = proto_register_protocol("Raw packet data", "Raw", "raw");
185 proto_register_subtree_array(ett, array_length(ett));
189 proto_reg_handoff_raw(void)
191 dissector_handle_t raw_handle;
194 * Get handles for the IP, IPv6, undissected-data, and
195 * PPP-in-HDLC-like-framing dissectors.
197 ip_handle = find_dissector("ip");
198 ipv6_handle = find_dissector("ipv6");
199 data_handle = find_dissector("data");
200 ppp_hdlc_handle = find_dissector("ppp_hdlc");
201 raw_handle = create_dissector_handle(dissect_raw, proto_raw);
202 dissector_add("wtap_encap", WTAP_ENCAP_RAW_IP, raw_handle);