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 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