The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2001 WIDE Project. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
| 12 | * 3. Neither the name of the project nor the names of its contributors |
| 13 | * may be used to endorse or promote products derived from this software |
| 14 | * without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #ifndef lint |
| 30 | static const char rcsid[] _U_ = |
| 31 | "@(#) $Header: /tcpdump/master/tcpdump/print-mpls.c,v 1.13.2.1 2005/07/05 09:39:29 hannes Exp $ (LBL)"; |
| 32 | #endif |
| 33 | |
| 34 | #ifdef HAVE_CONFIG_H |
| 35 | #include "config.h" |
| 36 | #endif |
| 37 | |
| 38 | #include <tcpdump-stdinc.h> |
| 39 | |
| 40 | #include <stdio.h> |
| 41 | #include <stdlib.h> |
| 42 | #include <string.h> |
| 43 | |
| 44 | #include "addrtoname.h" |
| 45 | #include "interface.h" |
| 46 | #include "extract.h" /* must come after interface.h */ |
| 47 | #include "mpls.h" |
| 48 | |
| 49 | static const char *mpls_labelname[] = { |
| 50 | /*0*/ "IPv4 explicit NULL", "router alert", "IPv6 explicit NULL", |
| 51 | "implicit NULL", "rsvd", |
| 52 | /*5*/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd", |
| 53 | /*10*/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd", |
| 54 | /*15*/ "rsvd", |
| 55 | }; |
| 56 | |
| 57 | /* |
| 58 | * RFC3032: MPLS label stack encoding |
| 59 | */ |
| 60 | void |
| 61 | mpls_print(const u_char *bp, u_int length) |
| 62 | { |
| 63 | const u_char *p; |
| 64 | u_int32_t label_entry; |
| 65 | u_int16_t label_stack_depth = 0; |
| 66 | |
| 67 | p = bp; |
| 68 | printf("MPLS"); |
| 69 | do { |
| 70 | TCHECK2(*p, sizeof(label_entry)); |
| 71 | label_entry = EXTRACT_32BITS(p); |
| 72 | printf("%s(label %u", |
| 73 | label_stack_depth ? "\n\t" : " ", |
| 74 | MPLS_LABEL(label_entry)); |
| 75 | label_stack_depth++; |
| 76 | if (vflag && |
| 77 | MPLS_LABEL(label_entry) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0])) |
| 78 | printf(" (%s)", mpls_labelname[MPLS_LABEL(label_entry)]); |
| 79 | printf(", exp %u", MPLS_EXP(label_entry)); |
| 80 | if (MPLS_STACK(label_entry)) |
| 81 | printf(", [S]"); |
| 82 | printf(", ttl %u)", MPLS_TTL(label_entry)); |
| 83 | |
| 84 | p += sizeof(label_entry); |
| 85 | } while (!MPLS_STACK(label_entry)); |
| 86 | |
| 87 | switch (MPLS_LABEL(label_entry)) { |
| 88 | case 0: /* IPv4 explicit NULL label */ |
| 89 | case 3: /* IPv4 implicit NULL label */ |
| 90 | if (vflag>0) { |
| 91 | printf("\n\t"); |
| 92 | ip_print(gndo, p, length - (p - bp)); |
| 93 | } |
| 94 | else printf(", IP, length: %u",length); |
| 95 | break; |
| 96 | #ifdef INET6 |
| 97 | case 2: /* IPv6 explicit NULL label */ |
| 98 | if (vflag>0) { |
| 99 | printf("\n\t"); |
| 100 | ip6_print(p, length - (p - bp)); |
| 101 | } |
| 102 | else printf(", IPv6, length: %u",length); |
| 103 | break; |
| 104 | #endif |
| 105 | default: |
| 106 | /* |
| 107 | * Generally there's no indication of protocol in MPLS label |
| 108 | * encoding, however draft-hsmit-isis-aal5mux-00.txt describes |
| 109 | * a technique that looks at the first payload byte if the BOS (bottom of stack) |
| 110 | * bit is set and tries to determine the network layer protocol |
| 111 | * 0x45-0x4f is IPv4 |
| 112 | * 0x60-0x6f is IPv6 |
| 113 | * 0x81-0x83 is OSI (CLNP,ES-IS,IS-IS) |
| 114 | * this technique is sometimes known as NULL encapsulation |
| 115 | * and decoding is particularly useful for control-plane traffic [BGP] |
| 116 | * which cisco by default sends MPLS encapsulated |
| 117 | */ |
| 118 | |
| 119 | if (MPLS_STACK(label_entry)) { /* only do this if the stack bit is set */ |
| 120 | switch(*p) { |
| 121 | case 0x45: |
| 122 | case 0x46: |
| 123 | case 0x47: |
| 124 | case 0x48: |
| 125 | case 0x49: |
| 126 | case 0x4a: |
| 127 | case 0x4b: |
| 128 | case 0x4c: |
| 129 | case 0x4d: |
| 130 | case 0x4e: |
| 131 | case 0x4f: |
| 132 | if (vflag>0) { |
| 133 | printf("\n\t"); |
| 134 | ip_print(gndo, p, length - (p - bp)); |
| 135 | } |
| 136 | else printf(", IP, length: %u",length); |
| 137 | break; |
| 138 | #ifdef INET6 |
| 139 | case 0x60: |
| 140 | case 0x61: |
| 141 | case 0x62: |
| 142 | case 0x63: |
| 143 | case 0x64: |
| 144 | case 0x65: |
| 145 | case 0x66: |
| 146 | case 0x67: |
| 147 | case 0x68: |
| 148 | case 0x69: |
| 149 | case 0x6a: |
| 150 | case 0x6b: |
| 151 | case 0x6c: |
| 152 | case 0x6d: |
| 153 | case 0x6e: |
| 154 | case 0x6f: |
| 155 | if (vflag>0) { |
| 156 | printf("\n\t"); |
| 157 | ip6_print(p, length - (p - bp)); |
| 158 | } |
| 159 | else printf(", IPv6, length: %u",length); |
| 160 | break; |
| 161 | #endif |
| 162 | case 0x81: |
| 163 | case 0x82: |
| 164 | case 0x83: |
| 165 | if (vflag>0) { |
| 166 | printf("\n\t"); |
| 167 | isoclns_print(p, length - (p - bp), length - (p - bp)); |
| 168 | } |
| 169 | else printf(", OSI, length: %u",length); |
| 170 | break; |
| 171 | default: |
| 172 | /* ok bail out - we did not figure out what it is*/ |
| 173 | break; |
| 174 | } |
| 175 | } |
| 176 | return; |
| 177 | } |
| 178 | |
| 179 | trunc: |
| 180 | printf("[|MPLS]"); |
| 181 | } |
| 182 | |
| 183 | |
| 184 | /* |
| 185 | * Local Variables: |
| 186 | * c-style: whitesmith |
| 187 | * c-basic-offset: 8 |
| 188 | * End: |
| 189 | */ |