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