| /* |
| * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * Code by Matt Thomas, Digital Equipment Corporation |
| * with an awful lot of hacking by Jeffrey Mogul, DECWRL |
| */ |
| |
| #ifndef lint |
| static const char rcsid[] _U_ = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-llc.c,v 1.75 2007-04-13 09:43:11 hannes Exp $"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "interface.h" |
| #include "addrtoname.h" |
| #include "extract.h" /* must come after interface.h */ |
| |
| #include "llc.h" |
| #include "ethertype.h" |
| #include "oui.h" |
| |
| static struct tok llc_values[] = { |
| { LLCSAP_NULL, "Null" }, |
| { LLCSAP_GLOBAL, "Global" }, |
| { LLCSAP_8021B_I, "802.1B I" }, |
| { LLCSAP_8021B_G, "802.1B G" }, |
| { LLCSAP_IP, "IP" }, |
| { LLCSAP_SNA, "SNA" }, |
| { LLCSAP_PROWAYNM, "ProWay NM" }, |
| { LLCSAP_8021D, "STP" }, |
| { LLCSAP_RS511, "RS511" }, |
| { LLCSAP_ISO8208, "ISO8208" }, |
| { LLCSAP_PROWAY, "ProWay" }, |
| { LLCSAP_SNAP, "SNAP" }, |
| { LLCSAP_IPX, "IPX" }, |
| { LLCSAP_NETBEUI, "NetBeui" }, |
| { LLCSAP_ISONS, "OSI" }, |
| { 0, NULL }, |
| }; |
| |
| static struct tok llc_cmd_values[] = { |
| { LLC_UI, "ui" }, |
| { LLC_TEST, "test" }, |
| { LLC_XID, "xid" }, |
| { LLC_UA, "ua" }, |
| { LLC_DISC, "disc" }, |
| { LLC_DM, "dm" }, |
| { LLC_SABME, "sabme" }, |
| { LLC_FRMR, "frmr" }, |
| { 0, NULL } |
| }; |
| |
| static const struct tok llc_flag_values[] = { |
| { 0, "Command" }, |
| { LLC_GSAP, "Response" }, |
| { LLC_U_POLL, "Poll" }, |
| { LLC_GSAP|LLC_U_POLL, "Final" }, |
| { LLC_IS_POLL, "Poll" }, |
| { LLC_GSAP|LLC_IS_POLL, "Final" }, |
| { 0, NULL } |
| }; |
| |
| |
| static const struct tok llc_ig_flag_values[] = { |
| { 0, "Individual" }, |
| { LLC_IG, "Group" }, |
| { 0, NULL } |
| }; |
| |
| |
| static const struct tok llc_supervisory_values[] = { |
| { 0, "Receiver Ready" }, |
| { 1, "Receiver not Ready" }, |
| { 2, "Reject" }, |
| { 0, NULL } |
| }; |
| |
| |
| static const struct tok cisco_values[] = { |
| { PID_CISCO_CDP, "CDP" }, |
| { PID_CISCO_VTP, "VTP" }, |
| { PID_CISCO_DTP, "DTP" }, |
| { PID_CISCO_UDLD, "UDLD" }, |
| { PID_CISCO_PVST, "PVST" }, |
| { 0, NULL } |
| }; |
| |
| static const struct tok bridged_values[] = { |
| { PID_RFC2684_ETH_FCS, "Ethernet + FCS" }, |
| { PID_RFC2684_ETH_NOFCS, "Ethernet w/o FCS" }, |
| { PID_RFC2684_802_4_FCS, "802.4 + FCS" }, |
| { PID_RFC2684_802_4_NOFCS, "802.4 w/o FCS" }, |
| { PID_RFC2684_802_5_FCS, "Token Ring + FCS" }, |
| { PID_RFC2684_802_5_NOFCS, "Token Ring w/o FCS" }, |
| { PID_RFC2684_FDDI_FCS, "FDDI + FCS" }, |
| { PID_RFC2684_FDDI_NOFCS, "FDDI w/o FCS" }, |
| { PID_RFC2684_802_6_FCS, "802.6 + FCS" }, |
| { PID_RFC2684_802_6_NOFCS, "802.6 w/o FCS" }, |
| { PID_RFC2684_BPDU, "BPDU" }, |
| { 0, NULL }, |
| }; |
| |
| static const struct tok null_values[] = { |
| { 0, NULL } |
| }; |
| |
| struct oui_tok { |
| u_int32_t oui; |
| const struct tok *tok; |
| }; |
| |
| static const struct oui_tok oui_to_tok[] = { |
| { OUI_ENCAP_ETHER, ethertype_values }, |
| { OUI_CISCO_90, ethertype_values }, /* uses some Ethertype values */ |
| { OUI_APPLETALK, ethertype_values }, /* uses some Ethertype values */ |
| { OUI_CISCO, cisco_values }, |
| { OUI_RFC2684, bridged_values }, /* bridged, RFC 2427 FR or RFC 2864 ATM */ |
| { 0, NULL } |
| }; |
| |
| /* |
| * Returns non-zero IFF it succeeds in printing the header |
| */ |
| int |
| llc_print(const u_char *p, u_int length, u_int caplen, |
| const u_char *esrc, const u_char *edst, u_short *extracted_ethertype) |
| { |
| u_int8_t dsap_field, dsap, ssap_field, ssap; |
| u_int16_t control; |
| int is_u; |
| register int ret; |
| |
| *extracted_ethertype = 0; |
| |
| if (caplen < 3) { |
| (void)printf("[|llc]"); |
| default_print((u_char *)p, caplen); |
| return(0); |
| } |
| |
| dsap_field = *p; |
| ssap_field = *(p + 1); |
| |
| /* |
| * OK, what type of LLC frame is this? The length |
| * of the control field depends on that - I frames |
| * have a two-byte control field, and U frames have |
| * a one-byte control field. |
| */ |
| control = *(p + 2); |
| if ((control & LLC_U_FMT) == LLC_U_FMT) { |
| /* |
| * U frame. |
| */ |
| is_u = 1; |
| } else { |
| /* |
| * The control field in I and S frames is |
| * 2 bytes... |
| */ |
| if (caplen < 4) { |
| (void)printf("[|llc]"); |
| default_print((u_char *)p, caplen); |
| return(0); |
| } |
| |
| /* |
| * ...and is little-endian. |
| */ |
| control = EXTRACT_LE_16BITS(p + 2); |
| is_u = 0; |
| } |
| |
| if (ssap_field == LLCSAP_GLOBAL && dsap_field == LLCSAP_GLOBAL) { |
| /* |
| * This is an Ethernet_802.3 IPX frame; it has an |
| * 802.3 header (i.e., an Ethernet header where the |
| * type/length field is <= ETHERMTU, i.e. it's a length |
| * field, not a type field), but has no 802.2 header - |
| * the IPX packet starts right after the Ethernet header, |
| * with a signature of two bytes of 0xFF (which is |
| * LLCSAP_GLOBAL). |
| * |
| * (It might also have been an Ethernet_802.3 IPX at |
| * one time, but got bridged onto another network, |
| * such as an 802.11 network; this has appeared in at |
| * least one capture file.) |
| */ |
| |
| if (eflag) |
| printf("IPX 802.3: "); |
| |
| ipx_print(p, length); |
| return (1); |
| } |
| |
| dsap = dsap_field & ~LLC_IG; |
| ssap = ssap_field & ~LLC_GSAP; |
| |
| if (eflag) { |
| printf("LLC, dsap %s (0x%02x) %s, ssap %s (0x%02x) %s", |
| tok2str(llc_values, "Unknown", dsap), |
| dsap, |
| tok2str(llc_ig_flag_values, "Unknown", dsap_field & LLC_IG), |
| tok2str(llc_values, "Unknown", ssap), |
| ssap, |
| tok2str(llc_flag_values, "Unknown", ssap_field & LLC_GSAP)); |
| |
| if (is_u) { |
| printf(", ctrl 0x%02x: ", control); |
| } else { |
| printf(", ctrl 0x%04x: ", control); |
| } |
| } |
| |
| if (ssap == LLCSAP_8021D && dsap == LLCSAP_8021D && |
| control == LLC_UI) { |
| stp_print(p+3, length-3); |
| return (1); |
| } |
| |
| if (ssap == LLCSAP_IP && dsap == LLCSAP_IP && |
| control == LLC_UI) { |
| ip_print(gndo, p+4, length-4); |
| return (1); |
| } |
| |
| if (ssap == LLCSAP_IPX && dsap == LLCSAP_IPX && |
| control == LLC_UI) { |
| /* |
| * This is an Ethernet_802.2 IPX frame, with an 802.3 |
| * header and an 802.2 LLC header with the source and |
| * destination SAPs being the IPX SAP. |
| * |
| * Skip DSAP, LSAP, and control field. |
| */ |
| if (eflag) |
| printf("IPX 802.2: "); |
| |
| ipx_print(p+3, length-3); |
| return (1); |
| } |
| |
| #ifdef TCPDUMP_DO_SMB |
| if (ssap == LLCSAP_NETBEUI && dsap == LLCSAP_NETBEUI |
| && (!(control & LLC_S_FMT) || control == LLC_U_FMT)) { |
| /* |
| * we don't actually have a full netbeui parser yet, but the |
| * smb parser can handle many smb-in-netbeui packets, which |
| * is very useful, so we call that |
| * |
| * We don't call it for S frames, however, just I frames |
| * (which are frames that don't have the low-order bit, |
| * LLC_S_FMT, set in the first byte of the control field) |
| * and UI frames (whose control field is just 3, LLC_U_FMT). |
| */ |
| |
| /* |
| * Skip the LLC header. |
| */ |
| if (is_u) { |
| p += 3; |
| length -= 3; |
| caplen -= 3; |
| } else { |
| p += 4; |
| length -= 4; |
| caplen -= 4; |
| } |
| netbeui_print(control, p, length); |
| return (1); |
| } |
| #endif |
| if (ssap == LLCSAP_ISONS && dsap == LLCSAP_ISONS |
| && control == LLC_UI) { |
| isoclns_print(p + 3, length - 3, caplen - 3); |
| return (1); |
| } |
| |
| if (ssap == LLCSAP_SNAP && dsap == LLCSAP_SNAP |
| && control == LLC_UI) { |
| /* |
| * XXX - what *is* the right bridge pad value here? |
| * Does anybody ever bridge one form of LAN traffic |
| * over a networking type that uses 802.2 LLC? |
| */ |
| ret = snap_print(p+3, length-3, caplen-3, 2); |
| if (ret) |
| return (ret); |
| } |
| |
| if (!eflag) { |
| if (ssap == dsap) { |
| if (esrc == NULL || edst == NULL) |
| (void)printf("%s ", tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)); |
| else |
| (void)printf("%s > %s %s ", |
| etheraddr_string(esrc), |
| etheraddr_string(edst), |
| tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)); |
| } else { |
| if (esrc == NULL || edst == NULL) |
| (void)printf("%s > %s ", |
| tok2str(llc_values, "Unknown SSAP 0x%02x", ssap), |
| tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)); |
| else |
| (void)printf("%s %s > %s %s ", |
| etheraddr_string(esrc), |
| tok2str(llc_values, "Unknown SSAP 0x%02x", ssap), |
| etheraddr_string(edst), |
| tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)); |
| } |
| } |
| |
| if (is_u) { |
| printf("Unnumbered, %s, Flags [%s], length %u", |
| tok2str(llc_cmd_values, "%02x", LLC_U_CMD(control)), |
| tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_U_POLL)), |
| length); |
| |
| p += 3; |
| length -= 3; |
| caplen -= 3; |
| |
| if ((control & ~LLC_U_POLL) == LLC_XID) { |
| if (*p == LLC_XID_FI) { |
| printf(": %02x %02x", p[1], p[2]); |
| p += 3; |
| length -= 3; |
| caplen -= 3; |
| } |
| } |
| } else { |
| if ((control & LLC_S_FMT) == LLC_S_FMT) { |
| (void)printf("Supervisory, %s, rcv seq %u, Flags [%s], length %u", |
| tok2str(llc_supervisory_values,"?",LLC_S_CMD(control)), |
| LLC_IS_NR(control), |
| tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_IS_POLL)), |
| length); |
| } else { |
| (void)printf("Information, send seq %u, rcv seq %u, Flags [%s], length %u", |
| LLC_I_NS(control), |
| LLC_IS_NR(control), |
| tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_IS_POLL)), |
| length); |
| } |
| p += 4; |
| length -= 4; |
| caplen -= 4; |
| } |
| return(1); |
| } |
| |
| int |
| snap_print(const u_char *p, u_int length, u_int caplen, u_int bridge_pad) |
| { |
| u_int32_t orgcode; |
| register u_short et; |
| register int ret; |
| |
| TCHECK2(*p, 5); |
| orgcode = EXTRACT_24BITS(p); |
| et = EXTRACT_16BITS(p + 3); |
| |
| if (eflag) { |
| const struct tok *tok = null_values; |
| const struct oui_tok *otp; |
| |
| for (otp = &oui_to_tok[0]; otp->tok != NULL; otp++) { |
| if (otp->oui == orgcode) { |
| tok = otp->tok; |
| break; |
| } |
| } |
| (void)printf("oui %s (0x%06x), %s %s (0x%04x): ", |
| tok2str(oui_values, "Unknown", orgcode), |
| orgcode, |
| (orgcode == 0x000000 ? "ethertype" : "pid"), |
| tok2str(tok, "Unknown", et), |
| et); |
| } |
| p += 5; |
| length -= 5; |
| caplen -= 5; |
| |
| switch (orgcode) { |
| case OUI_ENCAP_ETHER: |
| case OUI_CISCO_90: |
| /* |
| * This is an encapsulated Ethernet packet, |
| * or a packet bridged by some piece of |
| * Cisco hardware; the protocol ID is |
| * an Ethernet protocol type. |
| */ |
| ret = ethertype_print(gndo, et, p, length, caplen); |
| if (ret) |
| return (ret); |
| break; |
| |
| case OUI_APPLETALK: |
| if (et == ETHERTYPE_ATALK) { |
| /* |
| * No, I have no idea why Apple used one |
| * of their own OUIs, rather than |
| * 0x000000, and an Ethernet packet |
| * type, for Appletalk data packets, |
| * but used 0x000000 and an Ethernet |
| * packet type for AARP packets. |
| */ |
| ret = ethertype_print(gndo, et, p, length, caplen); |
| if (ret) |
| return (ret); |
| } |
| break; |
| |
| case OUI_CISCO: |
| switch (et) { |
| case PID_CISCO_CDP: |
| cdp_print(p, length, caplen); |
| return (1); |
| case PID_CISCO_DTP: |
| dtp_print(p, length); |
| return (1); |
| case PID_CISCO_UDLD: |
| udld_print(p, length); |
| return (1); |
| case PID_CISCO_VTP: |
| vtp_print(p, length); |
| return (1); |
| case PID_CISCO_PVST: |
| stp_print(p, length); |
| return (1); |
| default: |
| break; |
| } |
| |
| case OUI_RFC2684: |
| switch (et) { |
| |
| case PID_RFC2684_ETH_FCS: |
| case PID_RFC2684_ETH_NOFCS: |
| /* |
| * XXX - remove the last two bytes for |
| * PID_RFC2684_ETH_FCS? |
| */ |
| /* |
| * Skip the padding. |
| */ |
| TCHECK2(*p, bridge_pad); |
| caplen -= bridge_pad; |
| length -= bridge_pad; |
| p += bridge_pad; |
| |
| /* |
| * What remains is an Ethernet packet. |
| */ |
| ether_print(gndo, p, length, caplen, NULL, NULL); |
| return (1); |
| |
| case PID_RFC2684_802_5_FCS: |
| case PID_RFC2684_802_5_NOFCS: |
| /* |
| * XXX - remove the last two bytes for |
| * PID_RFC2684_ETH_FCS? |
| */ |
| /* |
| * Skip the padding, but not the Access |
| * Control field. |
| */ |
| TCHECK2(*p, bridge_pad); |
| caplen -= bridge_pad; |
| length -= bridge_pad; |
| p += bridge_pad; |
| |
| /* |
| * What remains is an 802.5 Token Ring |
| * packet. |
| */ |
| token_print(p, length, caplen); |
| return (1); |
| |
| case PID_RFC2684_FDDI_FCS: |
| case PID_RFC2684_FDDI_NOFCS: |
| /* |
| * XXX - remove the last two bytes for |
| * PID_RFC2684_ETH_FCS? |
| */ |
| /* |
| * Skip the padding. |
| */ |
| TCHECK2(*p, bridge_pad + 1); |
| caplen -= bridge_pad + 1; |
| length -= bridge_pad + 1; |
| p += bridge_pad + 1; |
| |
| /* |
| * What remains is an FDDI packet. |
| */ |
| fddi_print(p, length, caplen); |
| return (1); |
| |
| case PID_RFC2684_BPDU: |
| stp_print(p, length); |
| return (1); |
| } |
| } |
| return (0); |
| |
| trunc: |
| (void)printf("[|snap]"); |
| return (1); |
| } |
| |
| |
| /* |
| * Local Variables: |
| * c-style: whitesmith |
| * c-basic-offset: 8 |
| * End: |
| */ |
