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 1.9 2024/09/02 16:15:32 christos Exp $");
25 #endif
26
27 /* \summary: IPv6 routing header printer */
28
29 #include <config.h>
30
31 #include "netdissect-stdinc.h"
32
33 #include "netdissect.h"
34 #include "addrtoname.h"
35 #include "extract.h"
36
37 #include "ip6.h"
38
39 int
rt6_print(netdissect_options * ndo,const u_char * bp,const u_char * bp2 _U_)40 rt6_print(netdissect_options *ndo, const u_char *bp, const u_char *bp2 _U_)
41 {
42 const struct ip6_rthdr *dp;
43 const struct ip6_rthdr0 *dp0;
44 const struct ip6_srh *srh;
45 u_int i, len, type;
46 const u_char *p;
47
48 ndo->ndo_protocol = "rt6";
49
50 nd_print_protocol_caps(ndo);
51 dp = (const struct ip6_rthdr *)bp;
52
53 len = GET_U_1(dp->ip6r_len);
54 ND_PRINT(" (len=%u", len); /*)*/
55 type = GET_U_1(dp->ip6r_type);
56 ND_PRINT(", type=%u", type);
57 if (type == IPV6_RTHDR_TYPE_0)
58 ND_PRINT(" [Deprecated]");
59 ND_PRINT(", segleft=%u", GET_U_1(dp->ip6r_segleft));
60
61 switch (type) {
62 case IPV6_RTHDR_TYPE_0:
63 case IPV6_RTHDR_TYPE_2: /* Mobile IPv6 ID-20 */
64 dp0 = (const struct ip6_rthdr0 *)dp;
65
66 if (GET_BE_U_4(dp0->ip6r0_reserved) || ndo->ndo_vflag) {
67 ND_PRINT(", rsv=0x%0x",
68 GET_BE_U_4(dp0->ip6r0_reserved));
69 }
70
71 if (len % 2 == 1) {
72 ND_PRINT(" [length %u]", len);
73 goto invalid;
74 }
75 len >>= 1;
76 p = (const u_char *) dp0->ip6r0_addr;
77 for (i = 0; i < len; i++) {
78 ND_PRINT(", [%u]%s", i, GET_IP6ADDR_STRING(p));
79 p += 16;
80 }
81 /*(*/
82 ND_PRINT(") ");
83 return((GET_U_1(dp0->ip6r0_len) + 1) << 3);
84 break;
85 case IPV6_RTHDR_TYPE_4:
86 srh = (const struct ip6_srh *)dp;
87 ND_PRINT(", last-entry=%u", GET_U_1(srh->srh_last_ent));
88
89 if (GET_U_1(srh->srh_flags) || ndo->ndo_vflag) {
90 ND_PRINT(", flags=0x%0x",
91 GET_U_1(srh->srh_flags));
92 }
93
94 ND_PRINT(", tag=%x", GET_BE_U_2(srh->srh_tag));
95
96 if (len % 2 == 1) {
97 ND_PRINT(" (invalid length %u)", len);
98 goto invalid;
99 }
100 len >>= 1;
101 p = (const u_char *) srh->srh_segments;
102 for (i = 0; i < len; i++) {
103 ND_PRINT(", [%u]%s", i, GET_IP6ADDR_STRING(p));
104 p += 16;
105 }
106 /*(*/
107 ND_PRINT(") ");
108 return((GET_U_1(srh->srh_len) + 1) << 3);
109 break;
110 default:
111 ND_PRINT(" (unknown type)");
112 goto invalid;
113 }
114
115 invalid:
116 nd_print_invalid(ndo);
117 return -1;
118 }
119