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1 office 1 /*
2 * Copyright (C) 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 */
29  
30 #define NETDISSECT_REWORKED
31 #ifdef HAVE_CONFIG_H
32 #include "config.h"
33 #endif
34  
35 #ifdef INET6
36 #include <tcpdump-stdinc.h>
37  
38 #include "ip6.h"
39  
40 #include "interface.h"
41 #include "addrtoname.h"
42 #include "extract.h"
43  
44 static void
45 ip6_sopt_print(netdissect_options *ndo, const u_char *bp, int len)
46 {
47 int i;
48 int optlen;
49  
50 for (i = 0; i < len; i += optlen) {
51 if (bp[i] == IP6OPT_PAD1)
52 optlen = 1;
53 else {
54 if (i + 1 < len)
55 optlen = bp[i + 1] + 2;
56 else
57 goto trunc;
58 }
59 if (i + optlen > len)
60 goto trunc;
61  
62 switch (bp[i]) {
63 case IP6OPT_PAD1:
64 ND_PRINT((ndo, ", pad1"));
65 break;
66 case IP6OPT_PADN:
67 if (len - i < IP6OPT_MINLEN) {
68 ND_PRINT((ndo, ", padn: trunc"));
69 goto trunc;
70 }
71 ND_PRINT((ndo, ", padn"));
72 break;
73 default:
74 if (len - i < IP6OPT_MINLEN) {
75 ND_PRINT((ndo, ", sopt_type %d: trunc)", bp[i]));
76 goto trunc;
77 }
78 ND_PRINT((ndo, ", sopt_type 0x%02x: len=%d", bp[i], bp[i + 1]));
79 break;
80 }
81 }
82 return;
83  
84 trunc:
85 ND_PRINT((ndo, "[trunc] "));
86 }
87  
88 static void
89 ip6_opt_print(netdissect_options *ndo, const u_char *bp, int len)
90 {
91 int i;
92 int optlen = 0;
93  
94 if (len == 0)
95 return;
96 for (i = 0; i < len; i += optlen) {
97 if (bp[i] == IP6OPT_PAD1)
98 optlen = 1;
99 else {
100 if (i + 1 < len)
101 optlen = bp[i + 1] + 2;
102 else
103 goto trunc;
104 }
105 if (i + optlen > len)
106 goto trunc;
107  
108 switch (bp[i]) {
109 case IP6OPT_PAD1:
110 ND_PRINT((ndo, "(pad1)"));
111 break;
112 case IP6OPT_PADN:
113 if (len - i < IP6OPT_MINLEN) {
114 ND_PRINT((ndo, "(padn: trunc)"));
115 goto trunc;
116 }
117 ND_PRINT((ndo, "(padn)"));
118 break;
119 case IP6OPT_ROUTER_ALERT:
120 if (len - i < IP6OPT_RTALERT_LEN) {
121 ND_PRINT((ndo, "(rtalert: trunc)"));
122 goto trunc;
123 }
124 if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
125 ND_PRINT((ndo, "(rtalert: invalid len %d)", bp[i + 1]));
126 goto trunc;
127 }
128 ND_PRINT((ndo, "(rtalert: 0x%04x) ", EXTRACT_16BITS(&bp[i + 2])));
129 break;
130 case IP6OPT_JUMBO:
131 if (len - i < IP6OPT_JUMBO_LEN) {
132 ND_PRINT((ndo, "(jumbo: trunc)"));
133 goto trunc;
134 }
135 if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
136 ND_PRINT((ndo, "(jumbo: invalid len %d)", bp[i + 1]));
137 goto trunc;
138 }
139 ND_PRINT((ndo, "(jumbo: %u) ", EXTRACT_32BITS(&bp[i + 2])));
140 break;
141 case IP6OPT_HOME_ADDRESS:
142 if (len - i < IP6OPT_HOMEADDR_MINLEN) {
143 ND_PRINT((ndo, "(homeaddr: trunc)"));
144 goto trunc;
145 }
146 if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) {
147 ND_PRINT((ndo, "(homeaddr: invalid len %d)", bp[i + 1]));
148 goto trunc;
149 }
150 ND_PRINT((ndo, "(homeaddr: %s", ip6addr_string(ndo, &bp[i + 2])));
151 if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) {
152 ip6_sopt_print(ndo, &bp[i + IP6OPT_HOMEADDR_MINLEN],
153 (optlen - IP6OPT_HOMEADDR_MINLEN));
154 }
155 ND_PRINT((ndo, ")"));
156 break;
157 default:
158 if (len - i < IP6OPT_MINLEN) {
159 ND_PRINT((ndo, "(type %d: trunc)", bp[i]));
160 goto trunc;
161 }
162 ND_PRINT((ndo, "(opt_type 0x%02x: len=%d)", bp[i], bp[i + 1]));
163 break;
164 }
165 }
166 ND_PRINT((ndo, " "));
167 return;
168  
169 trunc:
170 ND_PRINT((ndo, "[trunc] "));
171 }
172  
173 int
174 hbhopt_print(netdissect_options *ndo, register const u_char *bp)
175 {
176 const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
177 int hbhlen = 0;
178  
179 ND_TCHECK(dp->ip6h_len);
180 hbhlen = (int)((dp->ip6h_len + 1) << 3);
181 ND_TCHECK2(*dp, hbhlen);
182 ND_PRINT((ndo, "HBH "));
183 if (ndo->ndo_vflag)
184 ip6_opt_print(ndo, (const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
185  
186 return(hbhlen);
187  
188 trunc:
189 ND_PRINT((ndo, "[|HBH]"));
190 return(-1);
191 }
192  
193 int
194 dstopt_print(netdissect_options *ndo, register const u_char *bp)
195 {
196 const struct ip6_dest *dp = (struct ip6_dest *)bp;
197 int dstoptlen = 0;
198  
199 ND_TCHECK(dp->ip6d_len);
200 dstoptlen = (int)((dp->ip6d_len + 1) << 3);
201 ND_TCHECK2(*dp, dstoptlen);
202 ND_PRINT((ndo, "DSTOPT "));
203 if (ndo->ndo_vflag) {
204 ip6_opt_print(ndo, (const u_char *)dp + sizeof(*dp),
205 dstoptlen - sizeof(*dp));
206 }
207  
208 return(dstoptlen);
209  
210 trunc:
211 ND_PRINT((ndo, "[|DSTOPT]"));
212 return(-1);
213 }
214 #endif /* INET6 */