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_ = |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 31 | "@(#) $Header: /tcpdump/master/tcpdump/print-mpls.c,v 1.14 2005-07-05 09:38:19 hannes Exp $ (LBL)"; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 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 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 57 | enum mpls_packet_type { |
| 58 | PT_UNKNOWN, |
| 59 | PT_IPV4, |
| 60 | PT_IPV6, |
| 61 | PT_OSI |
| 62 | }; |
| 63 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 64 | /* |
| 65 | * RFC3032: MPLS label stack encoding |
| 66 | */ |
| 67 | void |
| 68 | mpls_print(const u_char *bp, u_int length) |
| 69 | { |
| 70 | const u_char *p; |
| 71 | u_int32_t label_entry; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 72 | u_int16_t label_stack_depth = 0; |
| 73 | enum mpls_packet_type pt = PT_UNKNOWN; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 74 | |
| 75 | p = bp; |
| 76 | printf("MPLS"); |
| 77 | do { |
| 78 | TCHECK2(*p, sizeof(label_entry)); |
| 79 | label_entry = EXTRACT_32BITS(p); |
| 80 | printf("%s(label %u", |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 81 | (label_stack_depth && vflag) ? "\n\t" : " ", |
| 82 | MPLS_LABEL(label_entry)); |
| 83 | label_stack_depth++; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 84 | if (vflag && |
| 85 | MPLS_LABEL(label_entry) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0])) |
| 86 | printf(" (%s)", mpls_labelname[MPLS_LABEL(label_entry)]); |
| 87 | printf(", exp %u", MPLS_EXP(label_entry)); |
| 88 | if (MPLS_STACK(label_entry)) |
| 89 | printf(", [S]"); |
| 90 | printf(", ttl %u)", MPLS_TTL(label_entry)); |
| 91 | |
| 92 | p += sizeof(label_entry); |
| 93 | } while (!MPLS_STACK(label_entry)); |
| 94 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 95 | /* |
| 96 | * Try to figure out the packet type. |
| 97 | */ |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 98 | switch (MPLS_LABEL(label_entry)) { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 99 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 100 | case 0: /* IPv4 explicit NULL label */ |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 101 | case 3: /* IPv4 implicit NULL label */ |
| 102 | pt = PT_IPV4; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 103 | break; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 104 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 105 | case 2: /* IPv6 explicit NULL label */ |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 106 | pt = PT_IPV6; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 107 | break; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 108 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 109 | default: |
| 110 | /* |
| 111 | * Generally there's no indication of protocol in MPLS label |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 112 | * encoding. |
| 113 | * |
| 114 | * However, draft-hsmit-isis-aal5mux-00.txt describes a |
| 115 | * technique for encapsulating IS-IS and IP traffic on the |
| 116 | * same ATM virtual circuit; you look at the first payload |
| 117 | * byte to determine the network layer protocol, based on |
| 118 | * the fact that |
| 119 | * |
| 120 | * 1) the first byte of an IP header is 0x45-0x4f |
| 121 | * for IPv4 and 0x60-0x6f for IPv6; |
| 122 | * |
| 123 | * 2) the first byte of an OSI CLNP packet is 0x81, |
| 124 | * the first byte of an OSI ES-IS packet is 0x82, |
| 125 | * and the first byte of an OSI IS-IS packet is |
| 126 | * 0x83; |
| 127 | * |
| 128 | * so the network layer protocol can be inferred from the |
| 129 | * first byte of the packet, if the protocol is one of the |
| 130 | * ones listed above. |
| 131 | * |
| 132 | * Cisco sends control-plane traffic MPLS-encapsulated in |
| 133 | * this fashion. |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 134 | */ |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 135 | switch(*p) { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 136 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 137 | case 0x45: |
| 138 | case 0x46: |
| 139 | case 0x47: |
| 140 | case 0x48: |
| 141 | case 0x49: |
| 142 | case 0x4a: |
| 143 | case 0x4b: |
| 144 | case 0x4c: |
| 145 | case 0x4d: |
| 146 | case 0x4e: |
| 147 | case 0x4f: |
| 148 | pt = PT_IPV4; |
| 149 | break; |
| 150 | |
| 151 | case 0x60: |
| 152 | case 0x61: |
| 153 | case 0x62: |
| 154 | case 0x63: |
| 155 | case 0x64: |
| 156 | case 0x65: |
| 157 | case 0x66: |
| 158 | case 0x67: |
| 159 | case 0x68: |
| 160 | case 0x69: |
| 161 | case 0x6a: |
| 162 | case 0x6b: |
| 163 | case 0x6c: |
| 164 | case 0x6d: |
| 165 | case 0x6e: |
| 166 | case 0x6f: |
| 167 | pt = PT_IPV6; |
| 168 | break; |
| 169 | |
| 170 | case 0x81: |
| 171 | case 0x82: |
| 172 | case 0x83: |
| 173 | pt = PT_OSI; |
| 174 | break; |
| 175 | |
| 176 | default: |
| 177 | /* ok bail out - we did not figure out what it is*/ |
| 178 | break; |
| 179 | } |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 180 | } |
| 181 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 182 | /* |
| 183 | * Print the payload. |
| 184 | */ |
| 185 | if (pt == PT_UNKNOWN) { |
| 186 | if (!suppress_default_print) |
| 187 | default_print(p, length - (p - bp)); |
| 188 | return; |
| 189 | } |
| 190 | if (vflag) |
| 191 | printf("\n\t"); |
| 192 | else |
| 193 | printf(" "); |
| 194 | switch (pt) { |
| 195 | |
| 196 | case PT_IPV4: |
| 197 | ip_print(gndo, p, length - (p - bp)); |
| 198 | break; |
| 199 | |
| 200 | case PT_IPV6: |
| 201 | #ifdef INET6 |
| 202 | ip6_print(gndo, p, length - (p - bp)); |
| 203 | #else |
| 204 | printf("IPv6, length: %u", length); |
| 205 | #endif |
| 206 | break; |
| 207 | |
| 208 | case PT_OSI: |
| 209 | isoclns_print(p, length - (p - bp), length - (p - bp)); |
| 210 | break; |
| 211 | |
| 212 | default: |
| 213 | break; |
| 214 | } |
| 215 | return; |
| 216 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 217 | trunc: |
| 218 | printf("[|MPLS]"); |
| 219 | } |
| 220 | |
| 221 | |
| 222 | /* |
| 223 | * Local Variables: |
| 224 | * c-style: whitesmith |
| 225 | * c-basic-offset: 8 |
| 226 | * End: |
| 227 | */ |