diff options
Diffstat (limited to 'freebsd/contrib/tcpdump/print-llc.c')
| -rw-r--r-- | freebsd/contrib/tcpdump/print-llc.c | 549 |
1 files changed, 549 insertions, 0 deletions
diff --git a/freebsd/contrib/tcpdump/print-llc.c b/freebsd/contrib/tcpdump/print-llc.c new file mode 100644 index 00000000..f8801d39 --- /dev/null +++ b/freebsd/contrib/tcpdump/print-llc.c @@ -0,0 +1,549 @@ +#include <machine/rtems-bsd-user-space.h> + +/* + * 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 + * + * $FreeBSD$ + */ + +#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: + */ |