2 * Routines for IPsec/IPComp packet disassembly
4 * $Id: packet-ipsec.c,v 1.10 1999/11/16 11:42:35 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.
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;
54 static gint ett_ah = -1;
55 static gint ett_esp = -1;
56 static gint ett_ipcomp = -1;
59 guint8 ah_nxt; /* Next Header */
60 guint8 ah_len; /* Length of data + 1, in 32bit */
61 guint16 ah_reserve; /* Reserved for future use */
62 guint32 ah_spi; /* Security parameter index */
63 guint32 ah_seq; /* Sequence number field */
64 /* variable size, 32bit bound*/ /* Authentication data */
68 guint32 esp_spi; /* ESP */
69 guint32 esp_seq; /* Sequence number */
70 /*variable size*/ /* (IV and) Payload data */
71 /*variable size*/ /* padding */
72 /*8bit*/ /* pad size */
73 /*8bit*/ /* next header */
74 /*8bit*/ /* next header */
75 /*variable size, 32bit bound*/ /* Authentication data */
79 guint8 comp_nxt; /* Next Header */
80 guint8 comp_flags; /* Must be zero */
81 guint16 comp_cpi; /* Compression parameter index */
84 /* well-known algorithm number (in CPI), from RFC2409 */
85 #define IPCOMP_OUI 1 /* vendor specific */
86 #define IPCOMP_DEFLATE 2 /* RFC2394 */
87 #define IPCOMP_LZS 3 /* RFC2395 */
90 static const value_string cpi2val[] = {
91 { IPCOMP_OUI, "OUI" },
92 { IPCOMP_DEFLATE, "DEFLATE" },
93 { IPCOMP_LZS, "LZS" },
98 #define offsetof(type, member) ((size_t)(&((type *)0)->member))
102 dissect_ah(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
109 memcpy(&ah, (void *) &pd[offset], sizeof(ah));
110 advance = sizeof(ah) + ((ah.ah_len - 1) << 2);
112 if (check_col(fd, COL_PROTOCOL))
113 col_add_str(fd, COL_PROTOCOL, "AH");
114 if (check_col(fd, COL_INFO)) {
115 col_add_fstr(fd, COL_INFO, "AH (SPI=0x%08x)",
116 (guint32)ntohl(ah.ah_spi));
120 /* !!! specify length */
121 ti = proto_tree_add_item(tree, proto_ah, offset, advance, NULL);
122 ah_tree = proto_item_add_subtree(ti, ett_ah);
124 proto_tree_add_text(ah_tree, offset + offsetof(struct newah, ah_nxt), 1,
125 "Next Header: %s (0x%02x)", ipprotostr(ah.ah_nxt), ah.ah_nxt);
126 proto_tree_add_text(ah_tree, offset + offsetof(struct newah, ah_len), 1,
127 "Length: %d", ah.ah_len << 2);
128 proto_tree_add_item(ah_tree, hf_ah_spi,
129 offset + offsetof(struct newah, ah_spi), 4,
130 (guint32)ntohl(ah.ah_spi));
131 proto_tree_add_item(ah_tree, hf_ah_sequence,
132 offset + offsetof(struct newah, ah_seq), 4,
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(esp_tree, hf_esp_spi,
170 offset + offsetof(struct newesp, esp_spi), 4,
171 (guint32)ntohl(esp.esp_spi));
172 proto_tree_add_item(esp_tree, hf_esp_sequence,
173 offset + offsetof(struct newesp, esp_seq), 4,
174 (guint32)ntohl(esp.esp_seq));
175 dissect_data(pd, offset + sizeof(struct newesp), fd, esp_tree);
180 dissect_ipcomp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
182 proto_tree *ipcomp_tree;
184 struct ipcomp ipcomp;
187 memcpy(&ipcomp, (void *) &pd[offset], sizeof(ipcomp));
190 * load the top pane info. This should be overwritten by
191 * the next protocol in the stack
193 if (check_col(fd, COL_PROTOCOL))
194 col_add_str(fd, COL_PROTOCOL, "IPComp");
195 if (check_col(fd, COL_INFO)) {
196 p = val_to_str(ntohs(ipcomp.comp_cpi), cpi2val, "");
198 col_add_fstr(fd, COL_INFO, "IPComp (CPI=0x%04x)",
199 ntohs(ipcomp.comp_cpi));
201 col_add_fstr(fd, COL_INFO, "IPComp (CPI=%s)", p);
205 * populate a tree in the second pane with the status of the link layer
209 ti = proto_tree_add_item(tree, proto_ipcomp, offset, END_OF_FRAME,
211 ipcomp_tree = proto_item_add_subtree(ti, ett_ipcomp);
213 proto_tree_add_text(ipcomp_tree,
214 offset + offsetof(struct ipcomp, comp_nxt), 1,
215 "Next Header: %s (0x%02x)",
216 ipprotostr(ipcomp.comp_nxt), ipcomp.comp_nxt);
217 proto_tree_add_item(ipcomp_tree, hf_ipcomp_flags,
218 offset + offsetof(struct ipcomp, comp_flags), 1,
220 p = val_to_str(ntohs(ipcomp.comp_cpi), cpi2val, "");
222 proto_tree_add_item(ipcomp_tree, hf_ipcomp_cpi,
223 offset + offsetof(struct ipcomp, comp_cpi), 2,
224 ntohs(ipcomp.comp_cpi));
226 proto_tree_add_item_format(ipcomp_tree, hf_ipcomp_cpi,
227 offset + offsetof(struct ipcomp, comp_cpi), 2,
228 ntohs(ipcomp.comp_cpi),
230 p, ntohs(ipcomp.comp_cpi));
232 dissect_data(pd, offset + sizeof(struct ipcomp), fd, ipcomp_tree);
237 proto_register_ipsec(void)
240 static hf_register_info hf_ah[] = {
242 { "SPI", "ah.spi", FT_UINT32, BASE_HEX, NULL, 0x0,
245 { "Sequence", "ah.sequence", FT_UINT32, BASE_HEX, NULL, 0x0,
249 static hf_register_info hf_esp[] = {
251 { "SPI", "esp.spi", FT_UINT32, BASE_HEX, NULL, 0x0,
254 { "Sequence", "esp.sequence", FT_UINT32, BASE_HEX, NULL, 0x0,
258 static hf_register_info hf_ipcomp[] = {
260 { "Flags", "ipcomp.flags", FT_UINT8, BASE_HEX, NULL, 0x0,
263 { "CPI", "ipcomp.cpi", FT_UINT16, BASE_HEX, NULL, 0x0,
266 static gint *ett[] = {
272 proto_ah = proto_register_protocol("Authentication Header", "ah");
273 proto_register_field_array(proto_ah, hf_ah, array_length(hf_ah));
275 proto_esp = proto_register_protocol("Encapsulated Security Payload", "esp");
276 proto_register_field_array(proto_esp, hf_esp, array_length(hf_esp));
278 proto_ipcomp = proto_register_protocol("IP Payload Compression", "ipcomp");
279 proto_register_field_array(proto_ipcomp, hf_ipcomp, array_length(hf_ipcomp));
281 proto_register_subtree_array(ett, array_length(ett));