2 * Routines for IPsec/IPComp packet disassembly
4 * $Id: packet-ipsec.c,v 1.8 1999/10/15 05:46:18 itojun 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.
32 #ifdef HAVE_SYS_TYPES_H
33 # include <sys/types.h>
36 #ifdef HAVE_NETINET_IN_H
37 # include <netinet/in.h>
44 static int proto_ah = -1;
45 static int hf_ah_spi = -1;
46 static int hf_ah_sequence = -1;
47 static int proto_esp = -1;
48 static int hf_esp_spi = -1;
49 static int hf_esp_sequence = -1;
50 static int proto_ipcomp = -1;
51 static int hf_ipcomp_flags = -1;
52 static int hf_ipcomp_cpi = -1;
55 guint8 ah_nxt; /* Next Header */
56 guint8 ah_len; /* Length of data + 1, in 32bit */
57 guint16 ah_reserve; /* Reserved for future use */
58 guint32 ah_spi; /* Security parameter index */
59 guint32 ah_seq; /* Sequence number field */
60 /* variable size, 32bit bound*/ /* Authentication data */
64 guint32 esp_spi; /* ESP */
65 guint32 esp_seq; /* Sequence number */
66 /*variable size*/ /* (IV and) Payload data */
67 /*variable size*/ /* padding */
68 /*8bit*/ /* pad size */
69 /*8bit*/ /* next header */
70 /*8bit*/ /* next header */
71 /*variable size, 32bit bound*/ /* Authentication data */
75 guint8 comp_nxt; /* Next Header */
76 guint8 comp_flags; /* Must be zero */
77 guint16 comp_cpi; /* Compression parameter index */
80 /* well-known algorithm number (in CPI), from RFC2409 */
81 #define IPCOMP_OUI 1 /* vendor specific */
82 #define IPCOMP_DEFLATE 2 /* RFC2394 */
83 #define IPCOMP_LZS 3 /* RFC2395 */
86 static const value_string cpi2val[] = {
87 { IPCOMP_OUI, "OUI" },
88 { IPCOMP_DEFLATE, "DEFLATE" },
89 { IPCOMP_LZS, "LZS" },
94 #define offsetof(type, member) ((size_t)(&((type *)0)->member))
98 dissect_ah(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
105 memcpy(&ah, (void *) &pd[offset], sizeof(ah));
106 advance = sizeof(ah) + ((ah.ah_len - 1) << 2);
108 if (check_col(fd, COL_PROTOCOL))
109 col_add_str(fd, COL_PROTOCOL, "AH");
110 if (check_col(fd, COL_INFO)) {
111 col_add_fstr(fd, COL_INFO, "AH (SPI=0x%08x)",
112 (guint32)ntohl(ah.ah_spi));
116 /* !!! specify length */
117 ti = proto_tree_add_item(tree, proto_ah, offset, advance, NULL);
118 ah_tree = proto_item_add_subtree(ti, ETT_AH);
120 proto_tree_add_text(ah_tree, offset + offsetof(struct newah, ah_nxt), 1,
121 "Next Header: %s (0x%02x)", ipprotostr(ah.ah_nxt), ah.ah_nxt);
122 proto_tree_add_text(ah_tree, offset + offsetof(struct newah, ah_len), 1,
123 "Length: %d", ah.ah_len << 2);
124 proto_tree_add_item_format(ah_tree, hf_ah_spi,
125 offset + offsetof(struct newah, ah_spi), 4,
126 (guint32)ntohl(ah.ah_spi),
128 (guint32)ntohl(ah.ah_spi));
129 proto_tree_add_item_format(ah_tree, hf_ah_sequence,
130 offset + offsetof(struct newah, ah_seq), 4,
131 (guint32)ntohl(ah.ah_seq),
133 (guint32)ntohl(ah.ah_seq));
134 proto_tree_add_text(ah_tree, offset + sizeof(ah), (ah.ah_len - 1) << 2,
138 /* start of the new header (could be a extension header) */
143 dissect_esp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
145 proto_tree *esp_tree;
149 memcpy(&esp, (void *) &pd[offset], sizeof(esp));
152 * load the top pane info. This should be overwritten by
153 * the next protocol in the stack
155 if (check_col(fd, COL_PROTOCOL))
156 col_add_str(fd, COL_PROTOCOL, "ESP");
157 if (check_col(fd, COL_INFO)) {
158 col_add_fstr(fd, COL_INFO, "ESP (SPI=0x%08x)",
159 (guint32)ntohl(esp.esp_spi));
163 * populate a tree in the second pane with the status of the link layer
167 ti = proto_tree_add_item(tree, proto_esp, offset, END_OF_FRAME, NULL);
168 esp_tree = proto_item_add_subtree(ti, ETT_ESP);
169 proto_tree_add_item_format(esp_tree, hf_esp_spi,
170 offset + offsetof(struct newesp, esp_spi), 4,
171 (guint32)ntohl(esp.esp_spi),
173 (guint32)ntohl(esp.esp_spi));
174 proto_tree_add_item_format(esp_tree, hf_esp_sequence,
175 offset + offsetof(struct newesp, esp_seq), 4,
176 (guint32)ntohl(esp.esp_seq),
178 (guint32)ntohl(esp.esp_seq));
179 dissect_data(pd, offset + sizeof(struct newesp), fd, esp_tree);
184 dissect_ipcomp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
186 proto_tree *ipcomp_tree;
188 struct ipcomp ipcomp;
191 memcpy(&ipcomp, (void *) &pd[offset], sizeof(ipcomp));
194 * load the top pane info. This should be overwritten by
195 * the next protocol in the stack
197 if (check_col(fd, COL_PROTOCOL))
198 col_add_str(fd, COL_PROTOCOL, "IPComp");
199 if (check_col(fd, COL_INFO)) {
200 p = val_to_str(ntohs(ipcomp.comp_cpi), cpi2val, "");
202 col_add_fstr(fd, COL_INFO, "IPComp (CPI=0x%04x)",
203 ntohs(ipcomp.comp_cpi));
205 col_add_fstr(fd, COL_INFO, "IPComp (CPI=%s)", p);
209 * populate a tree in the second pane with the status of the link layer
213 ti = proto_tree_add_item(tree, proto_ipcomp, offset, END_OF_FRAME,
215 ipcomp_tree = proto_item_add_subtree(ti, ETT_IPCOMP);
217 proto_tree_add_text(ipcomp_tree,
218 offset + offsetof(struct ipcomp, comp_nxt), 1,
219 "Next Header: %s (0x%02x)",
220 ipprotostr(ipcomp.comp_nxt), ipcomp.comp_nxt);
221 proto_tree_add_item(ipcomp_tree, hf_ipcomp_flags,
222 offset + offsetof(struct ipcomp, comp_flags), 1,
224 p = val_to_str(ntohs(ipcomp.comp_cpi), cpi2val, "");
226 proto_tree_add_item(ipcomp_tree, hf_ipcomp_cpi,
227 offset + offsetof(struct ipcomp, comp_cpi), 2,
228 ntohs(ipcomp.comp_cpi));
230 proto_tree_add_item_format(ipcomp_tree, hf_ipcomp_cpi,
231 offset + offsetof(struct ipcomp, comp_cpi), 2,
232 ntohs(ipcomp.comp_cpi),
234 p, ntohs(ipcomp.comp_cpi));
236 dissect_data(pd, offset + sizeof(struct ipcomp), fd, ipcomp_tree);
241 proto_register_ipsec(void)
244 static hf_register_info hf_ah[] = {
246 { "SPI", "ah.spi", FT_UINT32, BASE_HEX, NULL, 0x0,
249 { "Sequence", "ah.sequence", FT_UINT32, BASE_HEX, NULL, 0x0,
253 static hf_register_info hf_esp[] = {
255 { "SPI", "esp.spi", FT_UINT32, BASE_HEX, NULL, 0x0,
258 { "Sequence", "esp.sequence", FT_UINT32, BASE_HEX, NULL, 0x0,
262 static hf_register_info hf_ipcomp[] = {
264 { "Flags", "ipcomp.flags", FT_UINT8, BASE_HEX, NULL, 0x0,
267 { "CPI", "ipcomp.cpi", FT_UINT16, BASE_HEX, NULL, 0x0,
271 proto_ah = proto_register_protocol("Authentication Header", "ah");
272 proto_register_field_array(proto_ah, hf_ah, array_length(hf_ah));
274 proto_esp = proto_register_protocol("Encapsulated Security Payload", "esp");
275 proto_register_field_array(proto_esp, hf_esp, array_length(hf_esp));
277 proto_ipcomp = proto_register_protocol("IP Payload Compression", "ipcomp");
278 proto_register_field_array(proto_ipcomp, hf_ipcomp, array_length(hf_ipcomp));