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 #include <sys/cdefs.h>
23 #ifndef lint
24 __RCSID("$NetBSD: print-rt6.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
25 #endif
26
27 #define NETDISSECT_REWORKED
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #ifdef INET6
33
34 #include <tcpdump-stdinc.h>
35
36 #include <string.h>
37
38 #include "ip6.h"
39
40 #include "interface.h"
41 #include "addrtoname.h"
42 #include "extract.h"
43
44 int
rt6_print(netdissect_options * ndo,register const u_char * bp,const u_char * bp2 _U_)45 rt6_print(netdissect_options *ndo, register const u_char *bp, const u_char *bp2 _U_)
46 {
47 register const struct ip6_rthdr *dp;
48 register const struct ip6_rthdr0 *dp0;
49 register const u_char *ep;
50 int i, len;
51 register const struct in6_addr *addr;
52 const struct in6_addr *last_addr = NULL;
53
54 dp = (struct ip6_rthdr *)bp;
55 len = dp->ip6r_len;
56
57 /* 'ep' points to the end of available data. */
58 ep = ndo->ndo_snapend;
59
60 ND_TCHECK(dp->ip6r_segleft);
61
62 ND_PRINT((ndo, "srcrt (len=%d", dp->ip6r_len)); /*)*/
63 ND_PRINT((ndo, ", type=%d", dp->ip6r_type));
64 ND_PRINT((ndo, ", segleft=%d", dp->ip6r_segleft));
65
66 switch (dp->ip6r_type) {
67 #ifndef IPV6_RTHDR_TYPE_0
68 #define IPV6_RTHDR_TYPE_0 0
69 #endif
70 #ifndef IPV6_RTHDR_TYPE_2
71 #define IPV6_RTHDR_TYPE_2 2
72 #endif
73 case IPV6_RTHDR_TYPE_0:
74 case IPV6_RTHDR_TYPE_2: /* Mobile IPv6 ID-20 */
75 dp0 = (struct ip6_rthdr0 *)dp;
76
77 ND_TCHECK(dp0->ip6r0_reserved);
78 if (dp0->ip6r0_reserved || ndo->ndo_vflag) {
79 ND_PRINT((ndo, ", rsv=0x%0x",
80 EXTRACT_32BITS(&dp0->ip6r0_reserved)));
81 }
82
83 if (len % 2 == 1)
84 goto trunc;
85 len >>= 1;
86 addr = &dp0->ip6r0_addr[0];
87 for (i = 0; i < len; i++) {
88 if ((u_char *)(addr + 1) > ep)
89 goto trunc;
90
91 ND_PRINT((ndo, ", [%d]%s", i, ip6addr_string(ndo, addr)));
92 last_addr = addr;
93 addr++;
94 }
95 /*
96 * the destination address used in the pseudo-header is that of the final
97 * destination : the last address of the routing header
98 */
99 if (last_addr != NULL) {
100 struct ip6_hdr *ip6 = (struct ip6_hdr *)bp2;
101 UNALIGNED_MEMCPY(&ip6->ip6_dst, last_addr, sizeof (struct in6_addr));
102 }
103 /*(*/
104 ND_PRINT((ndo, ") "));
105 return((dp0->ip6r0_len + 1) << 3);
106 break;
107 default:
108 goto trunc;
109 break;
110 }
111
112 trunc:
113 ND_PRINT((ndo, "[|srcrt]"));
114 return -1;
115 }
116 #endif /* INET6 */
117