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