2 * Copyright (C) 2002 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 /* \summary: IPv6 mobility printer */
37 #include "netdissect-stdinc.h"
39 #include "netdissect.h"
40 #include "addrtoname.h"
48 nd_uint8_t ip6m_pproto; /* following payload protocol (for PG) */
49 nd_uint8_t ip6m_len; /* length in units of 8 octets */
50 nd_uint8_t ip6m_type; /* message type */
51 nd_uint8_t reserved; /* reserved */
52 nd_uint16_t ip6m_cksum; /* sum of IPv6 pseudo-header and MH */
54 nd_uint16_t ip6m_un_data16[1]; /* type-specific field */
55 nd_uint8_t ip6m_un_data8[2]; /* type-specific field */
59 #define ip6m_data16 ip6m_dataun.ip6m_un_data16
60 #define ip6m_data8 ip6m_dataun.ip6m_un_data8
64 /* https://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml */
67 #define IP6M_BINDING_REQUEST 0 /* Binding Refresh Request */
68 #define IP6M_HOME_TEST_INIT 1 /* Home Test Init */
69 #define IP6M_CAREOF_TEST_INIT 2 /* Care-of Test Init */
70 #define IP6M_HOME_TEST 3 /* Home Test */
71 #define IP6M_CAREOF_TEST 4 /* Care-of Test */
72 #define IP6M_BINDING_UPDATE 5 /* Binding Update */
73 #define IP6M_BINDING_ACK 6 /* Binding Acknowledgement */
74 #define IP6M_BINDING_ERROR 7 /* Binding Error */
77 static const struct tok ip6m_str[] = {
78 { IP6M_BINDING_REQUEST, "BRR" },
79 { IP6M_HOME_TEST_INIT, "HoTI" },
80 { IP6M_CAREOF_TEST_INIT, "CoTI" },
81 { IP6M_HOME_TEST, "HoT" },
82 { IP6M_CAREOF_TEST, "CoT" },
83 { IP6M_BINDING_UPDATE, "BU" },
84 { IP6M_BINDING_ACK, "BA" },
85 { IP6M_BINDING_ERROR, "BE" },
89 static const unsigned ip6m_hdrlen[IP6M_MAX + 1] = {
90 IP6M_MINLEN, /* IP6M_BINDING_REQUEST */
91 IP6M_MINLEN + 8, /* IP6M_HOME_TEST_INIT */
92 IP6M_MINLEN + 8, /* IP6M_CAREOF_TEST_INIT */
93 IP6M_MINLEN + 16, /* IP6M_HOME_TEST */
94 IP6M_MINLEN + 16, /* IP6M_CAREOF_TEST */
95 IP6M_MINLEN + 4, /* IP6M_BINDING_UPDATE */
96 IP6M_MINLEN + 4, /* IP6M_BINDING_ACK */
97 IP6M_MINLEN + 16, /* IP6M_BINDING_ERROR */
100 /* Mobility Header Options */
101 #define IP6MOPT_MINLEN 2
102 #define IP6MOPT_PAD1 0x0 /* Pad1 */
103 #define IP6MOPT_PADN 0x1 /* PadN */
104 #define IP6MOPT_REFRESH 0x2 /* Binding Refresh Advice */
105 #define IP6MOPT_REFRESH_MINLEN 4
106 #define IP6MOPT_ALTCOA 0x3 /* Alternate Care-of Address */
107 #define IP6MOPT_ALTCOA_MINLEN 18
108 #define IP6MOPT_NONCEID 0x4 /* Nonce Indices */
109 #define IP6MOPT_NONCEID_MINLEN 6
110 #define IP6MOPT_AUTH 0x5 /* Binding Authorization Data */
111 #define IP6MOPT_AUTH_MINLEN 12
113 static const struct tok ip6m_binding_update_bits [] = {
122 mobility_opt_print(netdissect_options *ndo,
123 const u_char *bp, const unsigned len)
127 for (i = 0; i < len; i += optlen) {
128 if (GET_U_1(bp + i) == IP6MOPT_PAD1)
132 optlen = GET_U_1(bp + i + 1) + 2;
137 if (i + optlen > len)
139 ND_TCHECK_1(bp + i + optlen);
141 switch (GET_U_1(bp + i)) {
146 if (len - i < IP6MOPT_MINLEN) {
147 ND_PRINT("(padn: trunc)");
152 case IP6MOPT_REFRESH:
153 if (len - i < IP6MOPT_REFRESH_MINLEN) {
154 ND_PRINT("(refresh: trunc)");
157 /* units of 4 secs */
158 ND_PRINT("(refresh: %u)",
159 GET_BE_U_2(bp + i + 2) << 2);
162 if (len - i < IP6MOPT_ALTCOA_MINLEN) {
163 ND_PRINT("(altcoa: trunc)");
166 ND_PRINT("(alt-CoA: %s)", GET_IP6ADDR_STRING(bp + i + 2));
168 case IP6MOPT_NONCEID:
169 if (len - i < IP6MOPT_NONCEID_MINLEN) {
170 ND_PRINT("(ni: trunc)");
173 ND_PRINT("(ni: ho=0x%04x co=0x%04x)",
174 GET_BE_U_2(bp + i + 2),
175 GET_BE_U_2(bp + i + 4));
178 if (len - i < IP6MOPT_AUTH_MINLEN) {
179 ND_PRINT("(auth: trunc)");
185 if (len - i < IP6MOPT_MINLEN) {
186 ND_PRINT("(sopt_type %u: trunc)",
190 ND_PRINT("(type-0x%02x: len=%u)", GET_U_1(bp + i),
191 GET_U_1(bp + i + 1));
205 mobility_print(netdissect_options *ndo,
206 const u_char *bp, const u_char *bp2 _U_)
208 const struct ip6_mobility *mh;
210 unsigned mhlen, hlen;
213 ndo->ndo_protocol = "mobility";
214 mh = (const struct ip6_mobility *)bp;
216 /* 'ep' points to the end of available data. */
217 ep = ndo->ndo_snapend;
219 if (!ND_TTEST_1(mh->ip6m_len)) {
221 * There's not enough captured data to include the
222 * mobility header length.
224 * Our caller expects us to return the length, however,
225 * so return a value that will run to the end of the
228 * XXX - "ip6_print()" doesn't do anything with the
229 * returned length, however, as it breaks out of the
230 * header-processing loop.
232 mhlen = (unsigned)(ep - bp);
235 mhlen = (GET_U_1(mh->ip6m_len) + 1) << 3;
239 type = GET_U_1(mh->ip6m_type);
240 if (type <= IP6M_MAX && mhlen < ip6m_hdrlen[type]) {
241 ND_PRINT("(header length %u is too small for type %u)", mhlen, type);
244 ND_PRINT("mobility: %s", tok2str(ip6m_str, "type-#%u", type));
246 case IP6M_BINDING_REQUEST:
249 case IP6M_HOME_TEST_INIT:
250 case IP6M_CAREOF_TEST_INIT:
252 if (ndo->ndo_vflag) {
253 ND_PRINT(" %s Init Cookie=%08x:%08x",
254 type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
255 GET_BE_U_4(bp + hlen),
256 GET_BE_U_4(bp + hlen + 4));
261 case IP6M_CAREOF_TEST:
262 ND_PRINT(" nonce id=0x%x", GET_BE_U_2(mh->ip6m_data16[0]));
264 if (ndo->ndo_vflag) {
265 ND_PRINT(" %s Init Cookie=%08x:%08x",
266 type == IP6M_HOME_TEST ? "Home" : "Care-of",
267 GET_BE_U_4(bp + hlen),
268 GET_BE_U_4(bp + hlen + 4));
271 if (ndo->ndo_vflag) {
272 ND_PRINT(" %s Keygen Token=%08x:%08x",
273 type == IP6M_HOME_TEST ? "Home" : "Care-of",
274 GET_BE_U_4(bp + hlen),
275 GET_BE_U_4(bp + hlen + 4));
279 case IP6M_BINDING_UPDATE:
282 ND_PRINT(" seq#=%u", GET_BE_U_2(mh->ip6m_data16[0]));
284 ND_TCHECK_2(bp + hlen);
285 bits = (GET_U_1(bp + hlen) & 0xf0) >> 4;
289 bittok2str_nosep(ip6m_binding_update_bits,
290 "bits-#0x%x", bits));
292 /* Reserved (4bits) */
294 /* Reserved (8bits) */
296 /* units of 4 secs */
297 ND_PRINT(" lifetime=%u", GET_BE_U_2(bp + hlen) << 2);
301 case IP6M_BINDING_ACK:
302 ND_PRINT(" status=%u", GET_U_1(mh->ip6m_data8[0]));
303 if (GET_U_1(mh->ip6m_data8[1]) & 0x80)
305 /* Reserved (7bits) */
307 ND_PRINT(" seq#=%u", GET_BE_U_2(bp + hlen));
309 /* units of 4 secs */
310 ND_PRINT(" lifetime=%u", GET_BE_U_2(bp + hlen) << 2);
313 case IP6M_BINDING_ERROR:
314 ND_PRINT(" status=%u", GET_U_1(mh->ip6m_data8[0]));
317 ND_PRINT(" homeaddr %s", GET_IP6ADDR_STRING(bp + hlen));
321 ND_PRINT(" len=%u", GET_U_1(mh->ip6m_len));
326 if (mobility_opt_print(ndo, bp + hlen, mhlen - hlen))