The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997 |
| 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 | * Code by Matt Thomas, Digital Equipment Corporation |
| 22 | * with an awful lot of hacking by Jeffrey Mogul, DECWRL |
| 23 | */ |
| 24 | |
| 25 | #ifndef lint |
| 26 | static const char rcsid[] _U_ = |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 27 | "@(#) $Header: /tcpdump/master/tcpdump/print-llc.c,v 1.75 2007-04-13 09:43:11 hannes Exp $"; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 28 | #endif |
| 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | #include "config.h" |
| 32 | #endif |
| 33 | |
| 34 | #include <tcpdump-stdinc.h> |
| 35 | |
| 36 | #include <stdio.h> |
| 37 | #include <string.h> |
| 38 | |
| 39 | #include "interface.h" |
| 40 | #include "addrtoname.h" |
| 41 | #include "extract.h" /* must come after interface.h */ |
| 42 | |
| 43 | #include "llc.h" |
| 44 | #include "ethertype.h" |
| 45 | #include "oui.h" |
| 46 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 47 | static const struct tok llc_values[] = { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 48 | { LLCSAP_NULL, "Null" }, |
| 49 | { LLCSAP_GLOBAL, "Global" }, |
| 50 | { LLCSAP_8021B_I, "802.1B I" }, |
| 51 | { LLCSAP_8021B_G, "802.1B G" }, |
| 52 | { LLCSAP_IP, "IP" }, |
| 53 | { LLCSAP_SNA, "SNA" }, |
| 54 | { LLCSAP_PROWAYNM, "ProWay NM" }, |
| 55 | { LLCSAP_8021D, "STP" }, |
| 56 | { LLCSAP_RS511, "RS511" }, |
| 57 | { LLCSAP_ISO8208, "ISO8208" }, |
| 58 | { LLCSAP_PROWAY, "ProWay" }, |
| 59 | { LLCSAP_SNAP, "SNAP" }, |
| 60 | { LLCSAP_IPX, "IPX" }, |
| 61 | { LLCSAP_NETBEUI, "NetBeui" }, |
| 62 | { LLCSAP_ISONS, "OSI" }, |
| 63 | { 0, NULL }, |
| 64 | }; |
| 65 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 66 | static const struct tok llc_cmd_values[] = { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 67 | { LLC_UI, "ui" }, |
| 68 | { LLC_TEST, "test" }, |
| 69 | { LLC_XID, "xid" }, |
| 70 | { LLC_UA, "ua" }, |
| 71 | { LLC_DISC, "disc" }, |
| 72 | { LLC_DM, "dm" }, |
| 73 | { LLC_SABME, "sabme" }, |
| 74 | { LLC_FRMR, "frmr" }, |
| 75 | { 0, NULL } |
| 76 | }; |
| 77 | |
| 78 | static const struct tok llc_flag_values[] = { |
| 79 | { 0, "Command" }, |
| 80 | { LLC_GSAP, "Response" }, |
| 81 | { LLC_U_POLL, "Poll" }, |
| 82 | { LLC_GSAP|LLC_U_POLL, "Final" }, |
| 83 | { LLC_IS_POLL, "Poll" }, |
| 84 | { LLC_GSAP|LLC_IS_POLL, "Final" }, |
| 85 | { 0, NULL } |
| 86 | }; |
| 87 | |
| 88 | |
| 89 | static const struct tok llc_ig_flag_values[] = { |
| 90 | { 0, "Individual" }, |
| 91 | { LLC_IG, "Group" }, |
| 92 | { 0, NULL } |
| 93 | }; |
| 94 | |
| 95 | |
| 96 | static const struct tok llc_supervisory_values[] = { |
| 97 | { 0, "Receiver Ready" }, |
| 98 | { 1, "Receiver not Ready" }, |
| 99 | { 2, "Reject" }, |
| 100 | { 0, NULL } |
| 101 | }; |
| 102 | |
| 103 | |
| 104 | static const struct tok cisco_values[] = { |
| 105 | { PID_CISCO_CDP, "CDP" }, |
| 106 | { PID_CISCO_VTP, "VTP" }, |
| 107 | { PID_CISCO_DTP, "DTP" }, |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 108 | { PID_CISCO_UDLD, "UDLD" }, |
| 109 | { PID_CISCO_PVST, "PVST" }, |
| 110 | { PID_CISCO_VLANBRIDGE, "VLAN Bridge" }, |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 111 | { 0, NULL } |
| 112 | }; |
| 113 | |
| 114 | static const struct tok bridged_values[] = { |
| 115 | { PID_RFC2684_ETH_FCS, "Ethernet + FCS" }, |
| 116 | { PID_RFC2684_ETH_NOFCS, "Ethernet w/o FCS" }, |
| 117 | { PID_RFC2684_802_4_FCS, "802.4 + FCS" }, |
| 118 | { PID_RFC2684_802_4_NOFCS, "802.4 w/o FCS" }, |
| 119 | { PID_RFC2684_802_5_FCS, "Token Ring + FCS" }, |
| 120 | { PID_RFC2684_802_5_NOFCS, "Token Ring w/o FCS" }, |
| 121 | { PID_RFC2684_FDDI_FCS, "FDDI + FCS" }, |
| 122 | { PID_RFC2684_FDDI_NOFCS, "FDDI w/o FCS" }, |
| 123 | { PID_RFC2684_802_6_FCS, "802.6 + FCS" }, |
| 124 | { PID_RFC2684_802_6_NOFCS, "802.6 w/o FCS" }, |
| 125 | { PID_RFC2684_BPDU, "BPDU" }, |
| 126 | { 0, NULL }, |
| 127 | }; |
| 128 | |
| 129 | static const struct tok null_values[] = { |
| 130 | { 0, NULL } |
| 131 | }; |
| 132 | |
| 133 | struct oui_tok { |
| 134 | u_int32_t oui; |
| 135 | const struct tok *tok; |
| 136 | }; |
| 137 | |
| 138 | static const struct oui_tok oui_to_tok[] = { |
| 139 | { OUI_ENCAP_ETHER, ethertype_values }, |
| 140 | { OUI_CISCO_90, ethertype_values }, /* uses some Ethertype values */ |
| 141 | { OUI_APPLETALK, ethertype_values }, /* uses some Ethertype values */ |
| 142 | { OUI_CISCO, cisco_values }, |
| 143 | { OUI_RFC2684, bridged_values }, /* bridged, RFC 2427 FR or RFC 2864 ATM */ |
| 144 | { 0, NULL } |
| 145 | }; |
| 146 | |
| 147 | /* |
| 148 | * Returns non-zero IFF it succeeds in printing the header |
| 149 | */ |
| 150 | int |
| 151 | llc_print(const u_char *p, u_int length, u_int caplen, |
| 152 | const u_char *esrc, const u_char *edst, u_short *extracted_ethertype) |
| 153 | { |
| 154 | u_int8_t dsap_field, dsap, ssap_field, ssap; |
| 155 | u_int16_t control; |
| 156 | int is_u; |
| 157 | register int ret; |
| 158 | |
| 159 | *extracted_ethertype = 0; |
| 160 | |
| 161 | if (caplen < 3) { |
| 162 | (void)printf("[|llc]"); |
| 163 | default_print((u_char *)p, caplen); |
| 164 | return(0); |
| 165 | } |
| 166 | |
| 167 | dsap_field = *p; |
| 168 | ssap_field = *(p + 1); |
| 169 | |
| 170 | /* |
| 171 | * OK, what type of LLC frame is this? The length |
| 172 | * of the control field depends on that - I frames |
| 173 | * have a two-byte control field, and U frames have |
| 174 | * a one-byte control field. |
| 175 | */ |
| 176 | control = *(p + 2); |
| 177 | if ((control & LLC_U_FMT) == LLC_U_FMT) { |
| 178 | /* |
| 179 | * U frame. |
| 180 | */ |
| 181 | is_u = 1; |
| 182 | } else { |
| 183 | /* |
| 184 | * The control field in I and S frames is |
| 185 | * 2 bytes... |
| 186 | */ |
| 187 | if (caplen < 4) { |
| 188 | (void)printf("[|llc]"); |
| 189 | default_print((u_char *)p, caplen); |
| 190 | return(0); |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * ...and is little-endian. |
| 195 | */ |
| 196 | control = EXTRACT_LE_16BITS(p + 2); |
| 197 | is_u = 0; |
| 198 | } |
| 199 | |
| 200 | if (ssap_field == LLCSAP_GLOBAL && dsap_field == LLCSAP_GLOBAL) { |
| 201 | /* |
| 202 | * This is an Ethernet_802.3 IPX frame; it has an |
| 203 | * 802.3 header (i.e., an Ethernet header where the |
| 204 | * type/length field is <= ETHERMTU, i.e. it's a length |
| 205 | * field, not a type field), but has no 802.2 header - |
| 206 | * the IPX packet starts right after the Ethernet header, |
| 207 | * with a signature of two bytes of 0xFF (which is |
| 208 | * LLCSAP_GLOBAL). |
| 209 | * |
| 210 | * (It might also have been an Ethernet_802.3 IPX at |
| 211 | * one time, but got bridged onto another network, |
| 212 | * such as an 802.11 network; this has appeared in at |
| 213 | * least one capture file.) |
| 214 | */ |
| 215 | |
| 216 | if (eflag) |
| 217 | printf("IPX 802.3: "); |
| 218 | |
| 219 | ipx_print(p, length); |
| 220 | return (1); |
| 221 | } |
| 222 | |
| 223 | dsap = dsap_field & ~LLC_IG; |
| 224 | ssap = ssap_field & ~LLC_GSAP; |
| 225 | |
| 226 | if (eflag) { |
| 227 | printf("LLC, dsap %s (0x%02x) %s, ssap %s (0x%02x) %s", |
| 228 | tok2str(llc_values, "Unknown", dsap), |
| 229 | dsap, |
| 230 | tok2str(llc_ig_flag_values, "Unknown", dsap_field & LLC_IG), |
| 231 | tok2str(llc_values, "Unknown", ssap), |
| 232 | ssap, |
| 233 | tok2str(llc_flag_values, "Unknown", ssap_field & LLC_GSAP)); |
| 234 | |
| 235 | if (is_u) { |
| 236 | printf(", ctrl 0x%02x: ", control); |
| 237 | } else { |
| 238 | printf(", ctrl 0x%04x: ", control); |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | if (ssap == LLCSAP_8021D && dsap == LLCSAP_8021D && |
| 243 | control == LLC_UI) { |
| 244 | stp_print(p+3, length-3); |
| 245 | return (1); |
| 246 | } |
| 247 | |
| 248 | if (ssap == LLCSAP_IP && dsap == LLCSAP_IP && |
| 249 | control == LLC_UI) { |
| 250 | ip_print(gndo, p+4, length-4); |
| 251 | return (1); |
| 252 | } |
| 253 | |
| 254 | if (ssap == LLCSAP_IPX && dsap == LLCSAP_IPX && |
| 255 | control == LLC_UI) { |
| 256 | /* |
| 257 | * This is an Ethernet_802.2 IPX frame, with an 802.3 |
| 258 | * header and an 802.2 LLC header with the source and |
| 259 | * destination SAPs being the IPX SAP. |
| 260 | * |
| 261 | * Skip DSAP, LSAP, and control field. |
| 262 | */ |
| 263 | if (eflag) |
| 264 | printf("IPX 802.2: "); |
| 265 | |
| 266 | ipx_print(p+3, length-3); |
| 267 | return (1); |
| 268 | } |
| 269 | |
| 270 | #ifdef TCPDUMP_DO_SMB |
| 271 | if (ssap == LLCSAP_NETBEUI && dsap == LLCSAP_NETBEUI |
| 272 | && (!(control & LLC_S_FMT) || control == LLC_U_FMT)) { |
| 273 | /* |
| 274 | * we don't actually have a full netbeui parser yet, but the |
| 275 | * smb parser can handle many smb-in-netbeui packets, which |
| 276 | * is very useful, so we call that |
| 277 | * |
| 278 | * We don't call it for S frames, however, just I frames |
| 279 | * (which are frames that don't have the low-order bit, |
| 280 | * LLC_S_FMT, set in the first byte of the control field) |
| 281 | * and UI frames (whose control field is just 3, LLC_U_FMT). |
| 282 | */ |
| 283 | |
| 284 | /* |
| 285 | * Skip the LLC header. |
| 286 | */ |
| 287 | if (is_u) { |
| 288 | p += 3; |
| 289 | length -= 3; |
| 290 | caplen -= 3; |
| 291 | } else { |
| 292 | p += 4; |
| 293 | length -= 4; |
| 294 | caplen -= 4; |
| 295 | } |
| 296 | netbeui_print(control, p, length); |
| 297 | return (1); |
| 298 | } |
| 299 | #endif |
| 300 | if (ssap == LLCSAP_ISONS && dsap == LLCSAP_ISONS |
| 301 | && control == LLC_UI) { |
| 302 | isoclns_print(p + 3, length - 3, caplen - 3); |
| 303 | return (1); |
| 304 | } |
| 305 | |
| 306 | if (ssap == LLCSAP_SNAP && dsap == LLCSAP_SNAP |
| 307 | && control == LLC_UI) { |
| 308 | /* |
| 309 | * XXX - what *is* the right bridge pad value here? |
| 310 | * Does anybody ever bridge one form of LAN traffic |
| 311 | * over a networking type that uses 802.2 LLC? |
| 312 | */ |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 313 | ret = snap_print(p+3, length-3, caplen-3, 2); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 314 | if (ret) |
| 315 | return (ret); |
| 316 | } |
| 317 | |
| 318 | if (!eflag) { |
| 319 | if (ssap == dsap) { |
| 320 | if (esrc == NULL || edst == NULL) |
| 321 | (void)printf("%s ", tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)); |
| 322 | else |
| 323 | (void)printf("%s > %s %s ", |
| 324 | etheraddr_string(esrc), |
| 325 | etheraddr_string(edst), |
| 326 | tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)); |
| 327 | } else { |
| 328 | if (esrc == NULL || edst == NULL) |
| 329 | (void)printf("%s > %s ", |
| 330 | tok2str(llc_values, "Unknown SSAP 0x%02x", ssap), |
| 331 | tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)); |
| 332 | else |
| 333 | (void)printf("%s %s > %s %s ", |
| 334 | etheraddr_string(esrc), |
| 335 | tok2str(llc_values, "Unknown SSAP 0x%02x", ssap), |
| 336 | etheraddr_string(edst), |
| 337 | tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | if (is_u) { |
| 342 | printf("Unnumbered, %s, Flags [%s], length %u", |
| 343 | tok2str(llc_cmd_values, "%02x", LLC_U_CMD(control)), |
| 344 | tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_U_POLL)), |
| 345 | length); |
| 346 | |
| 347 | p += 3; |
| 348 | length -= 3; |
| 349 | caplen -= 3; |
| 350 | |
| 351 | if ((control & ~LLC_U_POLL) == LLC_XID) { |
| 352 | if (*p == LLC_XID_FI) { |
| 353 | printf(": %02x %02x", p[1], p[2]); |
| 354 | p += 3; |
| 355 | length -= 3; |
| 356 | caplen -= 3; |
| 357 | } |
| 358 | } |
| 359 | } else { |
| 360 | if ((control & LLC_S_FMT) == LLC_S_FMT) { |
| 361 | (void)printf("Supervisory, %s, rcv seq %u, Flags [%s], length %u", |
| 362 | tok2str(llc_supervisory_values,"?",LLC_S_CMD(control)), |
| 363 | LLC_IS_NR(control), |
| 364 | tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_IS_POLL)), |
| 365 | length); |
| 366 | } else { |
| 367 | (void)printf("Information, send seq %u, rcv seq %u, Flags [%s], length %u", |
| 368 | LLC_I_NS(control), |
| 369 | LLC_IS_NR(control), |
| 370 | tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_IS_POLL)), |
| 371 | length); |
| 372 | } |
| 373 | p += 4; |
| 374 | length -= 4; |
| 375 | caplen -= 4; |
| 376 | } |
| 377 | return(1); |
| 378 | } |
| 379 | |
| 380 | int |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 381 | snap_print(const u_char *p, u_int length, u_int caplen, u_int bridge_pad) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 382 | { |
| 383 | u_int32_t orgcode; |
| 384 | register u_short et; |
| 385 | register int ret; |
| 386 | |
| 387 | TCHECK2(*p, 5); |
| 388 | orgcode = EXTRACT_24BITS(p); |
| 389 | et = EXTRACT_16BITS(p + 3); |
| 390 | |
| 391 | if (eflag) { |
| 392 | const struct tok *tok = null_values; |
| 393 | const struct oui_tok *otp; |
| 394 | |
| 395 | for (otp = &oui_to_tok[0]; otp->tok != NULL; otp++) { |
| 396 | if (otp->oui == orgcode) { |
| 397 | tok = otp->tok; |
| 398 | break; |
| 399 | } |
| 400 | } |
| 401 | (void)printf("oui %s (0x%06x), %s %s (0x%04x): ", |
| 402 | tok2str(oui_values, "Unknown", orgcode), |
| 403 | orgcode, |
| 404 | (orgcode == 0x000000 ? "ethertype" : "pid"), |
| 405 | tok2str(tok, "Unknown", et), |
| 406 | et); |
| 407 | } |
| 408 | p += 5; |
| 409 | length -= 5; |
| 410 | caplen -= 5; |
| 411 | |
| 412 | switch (orgcode) { |
| 413 | case OUI_ENCAP_ETHER: |
| 414 | case OUI_CISCO_90: |
| 415 | /* |
| 416 | * This is an encapsulated Ethernet packet, |
| 417 | * or a packet bridged by some piece of |
| 418 | * Cisco hardware; the protocol ID is |
| 419 | * an Ethernet protocol type. |
| 420 | */ |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 421 | ret = ethertype_print(gndo, et, p, length, caplen); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 422 | if (ret) |
| 423 | return (ret); |
| 424 | break; |
| 425 | |
| 426 | case OUI_APPLETALK: |
| 427 | if (et == ETHERTYPE_ATALK) { |
| 428 | /* |
| 429 | * No, I have no idea why Apple used one |
| 430 | * of their own OUIs, rather than |
| 431 | * 0x000000, and an Ethernet packet |
| 432 | * type, for Appletalk data packets, |
| 433 | * but used 0x000000 and an Ethernet |
| 434 | * packet type for AARP packets. |
| 435 | */ |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 436 | ret = ethertype_print(gndo, et, p, length, caplen); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 437 | if (ret) |
| 438 | return (ret); |
| 439 | } |
| 440 | break; |
| 441 | |
| 442 | case OUI_CISCO: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 443 | switch (et) { |
| 444 | case PID_CISCO_CDP: |
| 445 | cdp_print(p, length, caplen); |
| 446 | return (1); |
| 447 | case PID_CISCO_DTP: |
| 448 | dtp_print(p, length); |
| 449 | return (1); |
| 450 | case PID_CISCO_UDLD: |
| 451 | udld_print(p, length); |
| 452 | return (1); |
| 453 | case PID_CISCO_VTP: |
| 454 | vtp_print(p, length); |
| 455 | return (1); |
| 456 | case PID_CISCO_PVST: |
| 457 | case PID_CISCO_VLANBRIDGE: |
| 458 | stp_print(p, length); |
| 459 | return (1); |
| 460 | default: |
| 461 | break; |
| 462 | } |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 463 | |
| 464 | case OUI_RFC2684: |
| 465 | switch (et) { |
| 466 | |
| 467 | case PID_RFC2684_ETH_FCS: |
| 468 | case PID_RFC2684_ETH_NOFCS: |
| 469 | /* |
| 470 | * XXX - remove the last two bytes for |
| 471 | * PID_RFC2684_ETH_FCS? |
| 472 | */ |
| 473 | /* |
| 474 | * Skip the padding. |
| 475 | */ |
| 476 | TCHECK2(*p, bridge_pad); |
| 477 | caplen -= bridge_pad; |
| 478 | length -= bridge_pad; |
| 479 | p += bridge_pad; |
| 480 | |
| 481 | /* |
| 482 | * What remains is an Ethernet packet. |
| 483 | */ |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 484 | ether_print(gndo, p, length, caplen, NULL, NULL); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 485 | return (1); |
| 486 | |
| 487 | case PID_RFC2684_802_5_FCS: |
| 488 | case PID_RFC2684_802_5_NOFCS: |
| 489 | /* |
| 490 | * XXX - remove the last two bytes for |
| 491 | * PID_RFC2684_ETH_FCS? |
| 492 | */ |
| 493 | /* |
| 494 | * Skip the padding, but not the Access |
| 495 | * Control field. |
| 496 | */ |
| 497 | TCHECK2(*p, bridge_pad); |
| 498 | caplen -= bridge_pad; |
| 499 | length -= bridge_pad; |
| 500 | p += bridge_pad; |
| 501 | |
| 502 | /* |
| 503 | * What remains is an 802.5 Token Ring |
| 504 | * packet. |
| 505 | */ |
| 506 | token_print(p, length, caplen); |
| 507 | return (1); |
| 508 | |
| 509 | case PID_RFC2684_FDDI_FCS: |
| 510 | case PID_RFC2684_FDDI_NOFCS: |
| 511 | /* |
| 512 | * XXX - remove the last two bytes for |
| 513 | * PID_RFC2684_ETH_FCS? |
| 514 | */ |
| 515 | /* |
| 516 | * Skip the padding. |
| 517 | */ |
| 518 | TCHECK2(*p, bridge_pad + 1); |
| 519 | caplen -= bridge_pad + 1; |
| 520 | length -= bridge_pad + 1; |
| 521 | p += bridge_pad + 1; |
| 522 | |
| 523 | /* |
| 524 | * What remains is an FDDI packet. |
| 525 | */ |
| 526 | fddi_print(p, length, caplen); |
| 527 | return (1); |
| 528 | |
| 529 | case PID_RFC2684_BPDU: |
| 530 | stp_print(p, length); |
| 531 | return (1); |
| 532 | } |
| 533 | } |
| 534 | return (0); |
| 535 | |
| 536 | trunc: |
| 537 | (void)printf("[|snap]"); |
| 538 | return (1); |
| 539 | } |
| 540 | |
| 541 | |
| 542 | /* |
| 543 | * Local Variables: |
| 544 | * c-style: whitesmith |
| 545 | * c-basic-offset: 8 |
| 546 | * End: |
| 547 | */ |