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 1.8 2023/08/17 20:19:40 christos Exp $"); 25 #endif 26 27 /* \summary: IPv6 routing header printer */ 28 29 #ifdef HAVE_CONFIG_H 30 #include <config.h> 31 #endif 32 33 #include "netdissect-stdinc.h" 34 35 #include "netdissect.h" 36 #include "addrtoname.h" 37 #include "extract.h" 38 39 #include "ip6.h" 40 41 int 42 rt6_print(netdissect_options *ndo, const u_char *bp, const u_char *bp2 _U_) 43 { 44 const struct ip6_rthdr *dp; 45 const struct ip6_rthdr0 *dp0; 46 const struct ip6_srh *srh; 47 u_int i, len, type; 48 const u_char *p; 49 50 ndo->ndo_protocol = "rt6"; 51 52 nd_print_protocol_caps(ndo); 53 dp = (const struct ip6_rthdr *)bp; 54 55 len = GET_U_1(dp->ip6r_len); 56 ND_PRINT(" (len=%u", len); /*)*/ 57 type = GET_U_1(dp->ip6r_type); 58 ND_PRINT(", type=%u", type); 59 if (type == IPV6_RTHDR_TYPE_0) 60 ND_PRINT(" [Deprecated]"); 61 ND_PRINT(", segleft=%u", GET_U_1(dp->ip6r_segleft)); 62 63 switch (type) { 64 case IPV6_RTHDR_TYPE_0: 65 case IPV6_RTHDR_TYPE_2: /* Mobile IPv6 ID-20 */ 66 dp0 = (const struct ip6_rthdr0 *)dp; 67 68 if (GET_BE_U_4(dp0->ip6r0_reserved) || ndo->ndo_vflag) { 69 ND_PRINT(", rsv=0x%0x", 70 GET_BE_U_4(dp0->ip6r0_reserved)); 71 } 72 73 if (len % 2 == 1) { 74 ND_PRINT(" (invalid length %u)", len); 75 goto invalid; 76 } 77 len >>= 1; 78 p = (const u_char *) dp0->ip6r0_addr; 79 for (i = 0; i < len; i++) { 80 ND_PRINT(", [%u]%s", i, GET_IP6ADDR_STRING(p)); 81 p += 16; 82 } 83 /*(*/ 84 ND_PRINT(") "); 85 return((GET_U_1(dp0->ip6r0_len) + 1) << 3); 86 break; 87 case IPV6_RTHDR_TYPE_4: 88 srh = (const struct ip6_srh *)dp; 89 ND_PRINT(", last-entry=%u", GET_U_1(srh->srh_last_ent)); 90 91 if (GET_U_1(srh->srh_flags) || ndo->ndo_vflag) { 92 ND_PRINT(", flags=0x%0x", 93 GET_U_1(srh->srh_flags)); 94 } 95 96 ND_PRINT(", tag=%x", GET_BE_U_2(srh->srh_tag)); 97 98 if (len % 2 == 1) { 99 ND_PRINT(" (invalid length %u)", len); 100 goto invalid; 101 } 102 len >>= 1; 103 p = (const u_char *) srh->srh_segments; 104 for (i = 0; i < len; i++) { 105 ND_PRINT(", [%u]%s", i, GET_IP6ADDR_STRING(p)); 106 p += 16; 107 } 108 /*(*/ 109 ND_PRINT(") "); 110 return((GET_U_1(srh->srh_len) + 1) << 3); 111 break; 112 default: 113 ND_PRINT(" (unknown type)"); 114 goto invalid; 115 } 116 117 invalid: 118 nd_print_invalid(ndo); 119 return -1; 120 } 121