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Add more nd_print_trunc() calls
[tcpdump] / print-rt6.c
1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22 /* \summary: IPv6 routing header printer */
23
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27
28 #include "netdissect-stdinc.h"
29
30 #include <string.h>
31
32 #include "netdissect.h"
33 #include "addrtoname.h"
34 #include "extract.h"
35
36 #include "ip6.h"
37
38 int
39 rt6_print(netdissect_options *ndo, const u_char *bp, const u_char *bp2 _U_)
40 {
41 const struct ip6_rthdr *dp;
42 const struct ip6_rthdr0 *dp0;
43 const struct ip6_srh *srh;
44 u_int i, len, type;
45 const u_char *p;
46
47 ndo->ndo_protocol = "rt6";
48 dp = (const struct ip6_rthdr *)bp;
49
50 ND_TCHECK_1(dp->ip6r_segleft);
51
52 len = EXTRACT_U_1(dp->ip6r_len);
53 ND_PRINT("srcrt (len=%u", len); /*)*/
54 type = EXTRACT_U_1(dp->ip6r_type);
55 ND_PRINT(", type=%u", type);
56 ND_PRINT(", segleft=%u", EXTRACT_U_1(dp->ip6r_segleft));
57
58 switch (type) {
59 case IPV6_RTHDR_TYPE_0:
60 case IPV6_RTHDR_TYPE_2: /* Mobile IPv6 ID-20 */
61 dp0 = (const struct ip6_rthdr0 *)dp;
62
63 ND_TCHECK_4(dp0->ip6r0_reserved);
64 if (EXTRACT_BE_U_4(dp0->ip6r0_reserved) || ndo->ndo_vflag) {
65 ND_PRINT(", rsv=0x%0x",
66 EXTRACT_BE_U_4(dp0->ip6r0_reserved));
67 }
68
69 if (len % 2 == 1)
70 goto trunc;
71 len >>= 1;
72 p = (const u_char *) dp0->ip6r0_addr;
73 for (i = 0; i < len; i++) {
74 ND_TCHECK_16(p);
75 ND_PRINT(", [%u]%s", i, ip6addr_string(ndo, p));
76 p += 16;
77 }
78 /*(*/
79 ND_PRINT(") ");
80 return((EXTRACT_U_1(dp0->ip6r0_len) + 1) << 3);
81 break;
82 case IPV6_RTHDR_TYPE_4:
83 srh = (const struct ip6_srh *)dp;
84 ND_TCHECK_1(srh->srh_last_ent);
85 ND_PRINT(", last-entry=%u", EXTRACT_U_1(srh->srh_last_ent));
86
87 ND_TCHECK_1(srh->srh_flags);
88 if (EXTRACT_U_1(srh->srh_flags) || ndo->ndo_vflag) {
89 ND_PRINT(", flags=0x%0x",
90 EXTRACT_U_1(srh->srh_flags));
91 }
92
93 ND_TCHECK_2(srh->srh_tag);
94 ND_PRINT(", tag=%x", EXTRACT_BE_U_2(srh->srh_tag));
95
96 if (len % 2 == 1)
97 goto trunc;
98 len >>= 1;
99 p = (const u_char *) srh->srh_segments;
100 for (i = 0; i < len; i++) {
101 ND_TCHECK_16(p);
102 ND_PRINT(", [%u]%s", i, ip6addr_string(ndo, p));
103 p += 16;
104 }
105 /*(*/
106 ND_PRINT(") ");
107 return((EXTRACT_U_1(srh->srh_len) + 1) << 3);
108 break;
109 default:
110 goto trunc;
111 break;
112 }
113
114 trunc:
115 ND_PRINT("[|srcrt]");
116 return -1;
117 }