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
rt6_print(netdissect_options * ndo,register const u_char * bp,const u_char * bp2 _U_)39 rt6_print(netdissect_options *ndo, register const u_char *bp, const u_char *bp2 _U_)
40 {
41 register const struct ip6_rthdr *dp;
42 register const struct ip6_rthdr0 *dp0;
43 register const u_char *ep;
44 int i, len;
45 register const struct in6_addr *addr;
46
47 dp = (const struct ip6_rthdr *)bp;
48
49 /* 'ep' points to the end of available data. */
50 ep = ndo->ndo_snapend;
51
52 ND_TCHECK(dp->ip6r_segleft);
53
54 len = dp->ip6r_len;
55 ND_PRINT((ndo, "srcrt (len=%d", dp->ip6r_len)); /*)*/
56 ND_PRINT((ndo, ", type=%d", dp->ip6r_type));
57 ND_PRINT((ndo, ", segleft=%d", dp->ip6r_segleft));
58
59 switch (dp->ip6r_type) {
60 case IPV6_RTHDR_TYPE_0:
61 case IPV6_RTHDR_TYPE_2: /* Mobile IPv6 ID-20 */
62 dp0 = (const struct ip6_rthdr0 *)dp;
63
64 ND_TCHECK(dp0->ip6r0_reserved);
65 if (EXTRACT_32BITS(dp0->ip6r0_reserved) || ndo->ndo_vflag) {
66 ND_PRINT((ndo, ", rsv=0x%0x",
67 EXTRACT_32BITS(&dp0->ip6r0_reserved)));
68 }
69
70 if (len % 2 == 1)
71 goto trunc;
72 len >>= 1;
73 addr = &dp0->ip6r0_addr[0];
74 for (i = 0; i < len; i++) {
75 if ((const u_char *)(addr + 1) > ep)
76 goto trunc;
77
78 ND_PRINT((ndo, ", [%d]%s", i, ip6addr_string(ndo, addr)));
79 addr++;
80 }
81 /*(*/
82 ND_PRINT((ndo, ") "));
83 return((dp0->ip6r0_len + 1) << 3);
84 break;
85 default:
86 goto trunc;
87 break;
88 }
89
90 trunc:
91 ND_PRINT((ndo, "[|srcrt]"));
92 return -1;
93 }
94