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 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