xref: /minix3/external/bsd/tcpdump/dist/print-rt6.c (revision b636d99d91c3d54204248f643c14627405d4afd1)
1*b636d99dSDavid van Moolenbroek /*
2*b636d99dSDavid van Moolenbroek  * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
3*b636d99dSDavid van Moolenbroek  *	The Regents of the University of California.  All rights reserved.
4*b636d99dSDavid van Moolenbroek  *
5*b636d99dSDavid van Moolenbroek  * Redistribution and use in source and binary forms, with or without
6*b636d99dSDavid van Moolenbroek  * modification, are permitted provided that: (1) source code distributions
7*b636d99dSDavid van Moolenbroek  * retain the above copyright notice and this paragraph in its entirety, (2)
8*b636d99dSDavid van Moolenbroek  * distributions including binary code include the above copyright notice and
9*b636d99dSDavid van Moolenbroek  * this paragraph in its entirety in the documentation or other materials
10*b636d99dSDavid van Moolenbroek  * provided with the distribution, and (3) all advertising materials mentioning
11*b636d99dSDavid van Moolenbroek  * features or use of this software display the following acknowledgement:
12*b636d99dSDavid van Moolenbroek  * ``This product includes software developed by the University of California,
13*b636d99dSDavid van Moolenbroek  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14*b636d99dSDavid van Moolenbroek  * the University nor the names of its contributors may be used to endorse
15*b636d99dSDavid van Moolenbroek  * or promote products derived from this software without specific prior
16*b636d99dSDavid van Moolenbroek  * written permission.
17*b636d99dSDavid van Moolenbroek  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18*b636d99dSDavid van Moolenbroek  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19*b636d99dSDavid van Moolenbroek  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20*b636d99dSDavid van Moolenbroek  */
21*b636d99dSDavid van Moolenbroek 
22*b636d99dSDavid van Moolenbroek #include <sys/cdefs.h>
23*b636d99dSDavid van Moolenbroek #ifndef lint
24*b636d99dSDavid van Moolenbroek __RCSID("$NetBSD: print-rt6.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
25*b636d99dSDavid van Moolenbroek #endif
26*b636d99dSDavid van Moolenbroek 
27*b636d99dSDavid van Moolenbroek #define NETDISSECT_REWORKED
28*b636d99dSDavid van Moolenbroek #ifdef HAVE_CONFIG_H
29*b636d99dSDavid van Moolenbroek #include "config.h"
30*b636d99dSDavid van Moolenbroek #endif
31*b636d99dSDavid van Moolenbroek 
32*b636d99dSDavid van Moolenbroek #ifdef INET6
33*b636d99dSDavid van Moolenbroek 
34*b636d99dSDavid van Moolenbroek #include <tcpdump-stdinc.h>
35*b636d99dSDavid van Moolenbroek 
36*b636d99dSDavid van Moolenbroek #include <string.h>
37*b636d99dSDavid van Moolenbroek 
38*b636d99dSDavid van Moolenbroek #include "ip6.h"
39*b636d99dSDavid van Moolenbroek 
40*b636d99dSDavid van Moolenbroek #include "interface.h"
41*b636d99dSDavid van Moolenbroek #include "addrtoname.h"
42*b636d99dSDavid van Moolenbroek #include "extract.h"
43*b636d99dSDavid van Moolenbroek 
44*b636d99dSDavid van Moolenbroek int
rt6_print(netdissect_options * ndo,register const u_char * bp,const u_char * bp2 _U_)45*b636d99dSDavid van Moolenbroek rt6_print(netdissect_options *ndo, register const u_char *bp, const u_char *bp2 _U_)
46*b636d99dSDavid van Moolenbroek {
47*b636d99dSDavid van Moolenbroek 	register const struct ip6_rthdr *dp;
48*b636d99dSDavid van Moolenbroek 	register const struct ip6_rthdr0 *dp0;
49*b636d99dSDavid van Moolenbroek 	register const u_char *ep;
50*b636d99dSDavid van Moolenbroek 	int i, len;
51*b636d99dSDavid van Moolenbroek 	register const struct in6_addr *addr;
52*b636d99dSDavid van Moolenbroek 	const struct in6_addr *last_addr = NULL;
53*b636d99dSDavid van Moolenbroek 
54*b636d99dSDavid van Moolenbroek 	dp = (struct ip6_rthdr *)bp;
55*b636d99dSDavid van Moolenbroek 	len = dp->ip6r_len;
56*b636d99dSDavid van Moolenbroek 
57*b636d99dSDavid van Moolenbroek 	/* 'ep' points to the end of available data. */
58*b636d99dSDavid van Moolenbroek 	ep = ndo->ndo_snapend;
59*b636d99dSDavid van Moolenbroek 
60*b636d99dSDavid van Moolenbroek 	ND_TCHECK(dp->ip6r_segleft);
61*b636d99dSDavid van Moolenbroek 
62*b636d99dSDavid van Moolenbroek 	ND_PRINT((ndo, "srcrt (len=%d", dp->ip6r_len));	/*)*/
63*b636d99dSDavid van Moolenbroek 	ND_PRINT((ndo, ", type=%d", dp->ip6r_type));
64*b636d99dSDavid van Moolenbroek 	ND_PRINT((ndo, ", segleft=%d", dp->ip6r_segleft));
65*b636d99dSDavid van Moolenbroek 
66*b636d99dSDavid van Moolenbroek 	switch (dp->ip6r_type) {
67*b636d99dSDavid van Moolenbroek #ifndef IPV6_RTHDR_TYPE_0
68*b636d99dSDavid van Moolenbroek #define IPV6_RTHDR_TYPE_0 0
69*b636d99dSDavid van Moolenbroek #endif
70*b636d99dSDavid van Moolenbroek #ifndef IPV6_RTHDR_TYPE_2
71*b636d99dSDavid van Moolenbroek #define IPV6_RTHDR_TYPE_2 2
72*b636d99dSDavid van Moolenbroek #endif
73*b636d99dSDavid van Moolenbroek 	case IPV6_RTHDR_TYPE_0:
74*b636d99dSDavid van Moolenbroek 	case IPV6_RTHDR_TYPE_2:			/* Mobile IPv6 ID-20 */
75*b636d99dSDavid van Moolenbroek 		dp0 = (struct ip6_rthdr0 *)dp;
76*b636d99dSDavid van Moolenbroek 
77*b636d99dSDavid van Moolenbroek 		ND_TCHECK(dp0->ip6r0_reserved);
78*b636d99dSDavid van Moolenbroek 		if (dp0->ip6r0_reserved || ndo->ndo_vflag) {
79*b636d99dSDavid van Moolenbroek 			ND_PRINT((ndo, ", rsv=0x%0x",
80*b636d99dSDavid van Moolenbroek 			    EXTRACT_32BITS(&dp0->ip6r0_reserved)));
81*b636d99dSDavid van Moolenbroek 		}
82*b636d99dSDavid van Moolenbroek 
83*b636d99dSDavid van Moolenbroek 		if (len % 2 == 1)
84*b636d99dSDavid van Moolenbroek 			goto trunc;
85*b636d99dSDavid van Moolenbroek 		len >>= 1;
86*b636d99dSDavid van Moolenbroek 		addr = &dp0->ip6r0_addr[0];
87*b636d99dSDavid van Moolenbroek 		for (i = 0; i < len; i++) {
88*b636d99dSDavid van Moolenbroek 			if ((u_char *)(addr + 1) > ep)
89*b636d99dSDavid van Moolenbroek 				goto trunc;
90*b636d99dSDavid van Moolenbroek 
91*b636d99dSDavid van Moolenbroek 			ND_PRINT((ndo, ", [%d]%s", i, ip6addr_string(ndo, addr)));
92*b636d99dSDavid van Moolenbroek 			last_addr = addr;
93*b636d99dSDavid van Moolenbroek 			addr++;
94*b636d99dSDavid van Moolenbroek 		}
95*b636d99dSDavid van Moolenbroek 		/*
96*b636d99dSDavid van Moolenbroek 		 * the destination address used in the pseudo-header is that of the final
97*b636d99dSDavid van Moolenbroek 		 * destination : the last address of the routing header
98*b636d99dSDavid van Moolenbroek 		 */
99*b636d99dSDavid van Moolenbroek 		if (last_addr != NULL) {
100*b636d99dSDavid van Moolenbroek 			struct ip6_hdr *ip6 = (struct ip6_hdr *)bp2;
101*b636d99dSDavid van Moolenbroek 			UNALIGNED_MEMCPY(&ip6->ip6_dst, last_addr, sizeof (struct in6_addr));
102*b636d99dSDavid van Moolenbroek 		}
103*b636d99dSDavid van Moolenbroek 		/*(*/
104*b636d99dSDavid van Moolenbroek 		ND_PRINT((ndo, ") "));
105*b636d99dSDavid van Moolenbroek 		return((dp0->ip6r0_len + 1) << 3);
106*b636d99dSDavid van Moolenbroek 		break;
107*b636d99dSDavid van Moolenbroek 	default:
108*b636d99dSDavid van Moolenbroek 		goto trunc;
109*b636d99dSDavid van Moolenbroek 		break;
110*b636d99dSDavid van Moolenbroek 	}
111*b636d99dSDavid van Moolenbroek 
112*b636d99dSDavid van Moolenbroek  trunc:
113*b636d99dSDavid van Moolenbroek 	ND_PRINT((ndo, "[|srcrt]"));
114*b636d99dSDavid van Moolenbroek 	return -1;
115*b636d99dSDavid van Moolenbroek }
116*b636d99dSDavid van Moolenbroek #endif /* INET6 */
117