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Current Path: /usr/src/contrib/tcpdump

📁 ..
📄 CHANGES(57.87 KB)
📄 CONTRIBUTING(5.93 KB)
📄 CREDITS(14.57 KB)
📄 INSTALL.txt(5.25 KB)
📄 LICENSE(873 B)
📄 Makefile-devel-adds(614 B)
📄 Makefile.in(9.96 KB)
📄 PLATFORMS(567 B)
📄 README(9.04 KB)
📄 README.md(9.04 KB)
📄 VERSION(6 B)
📄 addrtoname.c(33.19 KB)
📄 addrtoname.h(2.78 KB)
📄 addrtostr.c(5.64 KB)
📄 addrtostr.h(2.03 KB)
📄 af.c(1.96 KB)
📄 af.h(1.81 KB)
📄 ah.h(2.34 KB)
📄 appletalk.h(4.06 KB)
📄 ascii_strcasecmp.c(3.5 KB)
📄 ascii_strcasecmp.h(1.49 KB)
📄 atime.awk(529 B)
📄 atm.h(1.14 KB)
📄 bpf_dump.c(1.9 KB)
📄 chdlc.h(1.31 KB)
📄 checksum.c(5.25 KB)
📄 config.guess(43.17 KB)
📄 config.h.in(11.19 KB)
📄 config.sub(34.93 KB)
📄 configure(255.88 KB)
📄 configure.ac(25.05 KB)
📄 configure.in(25.66 KB)
📄 cpack.c(3.92 KB)
📄 cpack.h(2.37 KB)
📄 ether.h(2.34 KB)
📄 ethertype.h(5.58 KB)
📄 extract.h(11.48 KB)
📄 funcattrs.h(4.42 KB)
📄 getopt_long.h(2.52 KB)
📄 gmpls.c(5.82 KB)
📄 gmpls.h(1.38 KB)
📄 gmt2local.c(2.01 KB)
📄 gmt2local.h(1.21 KB)
📄 in_cksum.c(6.44 KB)
📄 install-sh(5.45 KB)
📄 interface.h(2.29 KB)
📄 ip.h(5.75 KB)
📄 ip6.h(7.6 KB)
📄 ipproto.c(16.49 KB)
📄 ipproto.h(4.72 KB)
📄 l2vpn.c(3.36 KB)
📄 l2vpn.h(781 B)
📁 lbl
📄 llc.h(3.72 KB)
📄 machdep.c(2.58 KB)
📄 machdep.h(1.24 KB)
📄 makemib(6.41 KB)
📄 mib.h(26.33 KB)
📁 missing
📄 mkdep(2.43 KB)
📄 mpls.h(1.93 KB)
📄 nameser.h(10.8 KB)
📄 netdissect-stdinc.h(9.93 KB)
📄 netdissect.c(3.38 KB)
📄 netdissect.h(30.13 KB)
📄 nfs.h(13.37 KB)
📄 nfsfh.h(2.57 KB)
📄 nlpid.c(1.27 KB)
📄 nlpid.h(1.3 KB)
📄 openflow.h(2.14 KB)
📄 ospf.h(10.21 KB)
📄 oui.c(3.83 KB)
📄 oui.h(4.06 KB)
📄 packetdat.awk(1.39 KB)
📄 parsenfsfh.c(12.87 KB)
📄 pcap-missing.h(1.8 KB)
📄 pcap_dump_ftell.c(1.29 KB)
📄 ppp.h(3.07 KB)
📄 print-802_11.c(91.47 KB)
📄 print-802_15_4.c(5.5 KB)
📄 print-ah.c(2.02 KB)
📄 print-ahcp.c(10.73 KB)
📄 print-aodv.c(15.98 KB)
📄 print-aoe.c(11.13 KB)
📄 print-ap1394.c(4 KB)
📄 print-arcnet.c(8.83 KB)
📄 print-arp.c(14.57 KB)
📄 print-ascii.c(6.23 KB)
📄 print-atalk.c(16.76 KB)
📄 print-atm.c(16.81 KB)
📄 print-babel.c(23.79 KB)
📄 print-beep.c(1.71 KB)
📄 print-bfd.c(16.5 KB)
📄 print-bgp.c(99.77 KB)
📄 print-bootp.c(30.07 KB)
📄 print-bt.c(2.21 KB)
📄 print-calm-fast.c(1.81 KB)
📄 print-carp.c(2.43 KB)
📄 print-cdp.c(11.16 KB)
📄 print-cfm.c(24.19 KB)
📄 print-chdlc.c(5.88 KB)
📄 print-cip.c(2.5 KB)
📄 print-cnfp.c(13.69 KB)
📄 print-dccp.c(17.75 KB)
📄 print-decnet.c(37.63 KB)
📄 print-dhcp6.c(23.22 KB)
📄 print-domain.c(18.44 KB)
📄 print-dtp.c(3.03 KB)
📄 print-dvmrp.c(8.98 KB)
📄 print-eap.c(9.26 KB)
📄 print-egp.c(8.69 KB)
📄 print-eigrp.c(19.49 KB)
📄 print-enc.c(4.2 KB)
📄 print-esp.c(21.46 KB)
📄 print-ether.c(12.91 KB)
📄 print-fddi.c(10.51 KB)
📄 print-forces.c(45.01 KB)
📄 print-fr.c(31.99 KB)
📄 print-frag6.c(2.36 KB)
📄 print-ftp.c(973 B)
📄 print-geneve.c(6.13 KB)
📄 print-geonet.c(6.72 KB)
📄 print-gre.c(9.72 KB)
📄 print-hncp.c(26.39 KB)
📄 print-hsrp.c(4.57 KB)
📄 print-http.c(1.51 KB)
📄 print-icmp.c(22.7 KB)
📄 print-icmp6.c(59.81 KB)
📄 print-igmp.c(10.05 KB)
📄 print-igrp.c(4.64 KB)
📄 print-ip.c(17.04 KB)
📄 print-ip6.c(10.57 KB)
📄 print-ip6opts.c(5.53 KB)
📄 print-ipcomp.c(2.32 KB)
📄 print-ipfc.c(4.41 KB)
📄 print-ipnet.c(2.78 KB)
📄 print-ipx.c(6.42 KB)
📄 print-isakmp.c(81.72 KB)
📄 print-isoclns.c(107.61 KB)
📄 print-juniper.c(48.42 KB)
📄 print-krb.c(6.26 KB)
📄 print-l2tp.c(23.94 KB)
📄 print-lane.c(3.04 KB)
📄 print-ldp.c(24.35 KB)
📄 print-lisp.c(15.23 KB)
📄 print-llc.c(16.68 KB)
📄 print-lldp.c(57.26 KB)
📄 print-lmp.c(38.11 KB)
📄 print-loopback.c(3.63 KB)
📄 print-lspping.c(51.64 KB)
📄 print-lwapp.c(13.01 KB)
📄 print-lwres.c(14.08 KB)
📄 print-m3ua.c(10.92 KB)
📄 print-medsa.c(5.57 KB)
📄 print-mobile.c(3.28 KB)
📄 print-mobility.c(9.74 KB)
📄 print-mpcp.c(7.87 KB)
📄 print-mpls.c(5.31 KB)
📄 print-mptcp.c(13.68 KB)
📄 print-msdp.c(2.69 KB)
📄 print-msnlb.c(2.39 KB)
📄 print-nflog.c(4.4 KB)
📄 print-nfs.c(42.84 KB)
📄 print-nsh.c(5.39 KB)
📄 print-ntp.c(13.34 KB)
📄 print-null.c(4.01 KB)
📄 print-olsr.c(23.42 KB)
📄 print-openflow-1.0.c(76.63 KB)
📄 print-openflow.c(4.77 KB)
📄 print-ospf.c(39.49 KB)
📄 print-ospf6.c(29.86 KB)
📄 print-otv.c(2.1 KB)
📄 print-pflog.c(4.86 KB)
📄 print-pfsync.c(12.53 KB)
📄 print-pgm.c(22.17 KB)
📄 print-pim.c(32.59 KB)
📄 print-pktap.c(5.18 KB)
📄 print-ppi.c(2.68 KB)
📄 print-ppp.c(46.16 KB)
📄 print-pppoe.c(5.65 KB)
📄 print-pptp.c(25.9 KB)
📄 print-radius.c(35.1 KB)
📄 print-raw.c(1.52 KB)
📄 print-resp.c(16.5 KB)
📄 print-rip.c(9.19 KB)
📄 print-ripng.c(6 KB)
📄 print-rpki-rtr.c(10.83 KB)
📄 print-rrcp.c(4.56 KB)
📄 print-rsvp.c(78.61 KB)
📄 print-rt6.c(2.66 KB)
📄 print-rtsp.c(1.16 KB)
📄 print-rx.c(66.92 KB)
📄 print-sctp.c(23.13 KB)
📄 print-sflow.c(31.91 KB)
📄 print-sip.c(1.29 KB)
📄 print-sl.c(6.95 KB)
📄 print-sll.c(9.2 KB)
📄 print-slow.c(25.17 KB)
📄 print-smb.c(43.19 KB)
📄 print-smtp.c(983 B)
📄 print-snmp.c(43.17 KB)
📄 print-stp.c(17.18 KB)
📄 print-sunatm.c(3.27 KB)
📄 print-sunrpc.c(7.85 KB)
📄 print-symantec.c(3.78 KB)
📄 print-syslog.c(3.96 KB)
📄 print-tcp.c(35.84 KB)
📄 print-telnet.c(15.02 KB)
📄 print-tftp.c(5.2 KB)
📄 print-timed.c(4.74 KB)
📄 print-tipc.c(11.53 KB)
📄 print-token.c(7.96 KB)
📄 print-udld.c(5.47 KB)
📄 print-udp.c(21.28 KB)
📄 print-usb.c(4.18 KB)
📄 print-vjc.c(4.45 KB)
📄 print-vqp.c(6.8 KB)
📄 print-vrrp.c(6.37 KB)
📄 print-vtp.c(13.56 KB)
📄 print-vxlan-gpe.c(3.46 KB)
📄 print-vxlan.c(2.21 KB)
📄 print-wb.c(10.93 KB)
📄 print-zephyr.c(8.03 KB)
📄 print-zeromq.c(7.5 KB)
📄 print.c(11.54 KB)
📄 print.h(1.78 KB)
📄 rpc_auth.h(2.77 KB)
📄 rpc_msg.h(3.19 KB)
📄 rpl.h(4.88 KB)
📄 send-ack.awk(1.56 KB)
📄 setsignal.c(3.27 KB)
📄 setsignal.h(1.24 KB)
📄 signature.c(5.58 KB)
📄 signature.h(1.12 KB)
📄 slcompress.h(3.55 KB)
📄 smb.h(5.38 KB)
📄 smbutil.c(63.88 KB)
📄 stime.awk(567 B)
📄 strtoaddr.c(5.34 KB)
📄 strtoaddr.h(992 B)
📄 tcp.h(5.02 KB)
📄 tcpdump.1.in(60.82 KB)
📄 tcpdump.c(69.76 KB)
📄 timeval-operations.h(3.19 KB)
📄 udp.h(8.25 KB)
📄 util-print.c(23.75 KB)
📄 vfprintf.c(1.62 KB)

Editing: print-llc.c

/*
 * 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
 */

/* \summary: IEEE 802.2 LLC printer */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <netdissect-stdinc.h>

#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"

#include "llc.h"
#include "ethertype.h"
#include "oui.h"

static const 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 const 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" },
	{ PID_CISCO_VLANBRIDGE, "VLAN Bridge" },
	{ 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 {
	uint32_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 }
};

/*
 * If we printed information about the payload, returns the length of the LLC
 * header, plus the length of any SNAP header following it.
 *
 * Otherwise (for example, if the packet has unknown SAPs or has a SNAP
 * header with an unknown OUI/PID combination), returns the *negative*
 * of that value.
 */
int
llc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen,
	  const struct lladdr_info *src, const struct lladdr_info *dst)
{
	uint8_t dsap_field, dsap, ssap_field, ssap;
	uint16_t control;
	int hdrlen;
	int is_u;

if (caplen < 3) {
		ND_PRINT((ndo, "[|llc]"));
		ND_DEFAULTPRINT((const u_char *)p, caplen);
		return (caplen);
	}
	if (length < 3) {
		ND_PRINT((ndo, "[|llc]"));
		ND_DEFAULTPRINT((const u_char *)p, caplen);
		return (length);
	}

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;
		hdrlen = 3;	/* DSAP, SSAP, 1-byte control field */
	} else {
		/*
		 * The control field in I and S frames is
		 * 2 bytes...
		 */
		if (caplen < 4) {
			ND_PRINT((ndo, "[|llc]"));
			ND_DEFAULTPRINT((const u_char *)p, caplen);
			return (caplen);
		}
		if (length < 4) {
			ND_PRINT((ndo, "[|llc]"));
			ND_DEFAULTPRINT((const u_char *)p, caplen);
			return (length);
		}

/*
		 * ...and is little-endian.
		 */
		control = EXTRACT_LE_16BITS(p + 2);
		is_u = 0;
		hdrlen = 4;	/* DSAP, SSAP, 2-byte control field */
	}

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 (ndo->ndo_eflag)
		ND_PRINT((ndo, "IPX 802.3: "));

ipx_print(ndo, p, length);
            return (0);		/* no LLC header */
	}

dsap = dsap_field & ~LLC_IG;
	ssap = ssap_field & ~LLC_GSAP;

if (ndo->ndo_eflag) {
                ND_PRINT((ndo, "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) {
			ND_PRINT((ndo, ", ctrl 0x%02x: ", control));
		} else {
			ND_PRINT((ndo, ", ctrl 0x%04x: ", control));
		}
	}

/*
	 * Skip LLC header.
	 */
	p += hdrlen;
	length -= hdrlen;
	caplen -= hdrlen;

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?
		 */
		if (!snap_print(ndo, p, length, caplen, src, dst, 2)) {
			/*
			 * Unknown packet type; tell our caller, by
			 * returning a negative value, so they
			 * can print the raw packet.
			 */
			return (-(hdrlen + 5));	/* include LLC and SNAP header */
		} else
			return (hdrlen + 5);	/* include LLC and SNAP header */
	}

if (ssap == LLCSAP_8021D && dsap == LLCSAP_8021D &&
	    control == LLC_UI) {
		stp_print(ndo, p, length);
		return (hdrlen);
	}

if (ssap == LLCSAP_IP && dsap == LLCSAP_IP &&
	    control == LLC_UI) {
		/*
		 * This is an RFC 948-style IP packet, with
		 * an 802.3 header and an 802.2 LLC header
		 * with the source and destination SAPs being
		 * the IP SAP.
		 */
		ip_print(ndo, p, length);
		return (hdrlen);
	}

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.
		 */
                if (ndo->ndo_eflag)
                        ND_PRINT((ndo, "IPX 802.2: "));

ipx_print(ndo, p, length);
		return (hdrlen);
	}

#ifdef ENABLE_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).
		 */
		netbeui_print(ndo, control, p, length);
		return (hdrlen);
	}
#endif
	if (ssap == LLCSAP_ISONS && dsap == LLCSAP_ISONS
	    && control == LLC_UI) {
		isoclns_print(ndo, p, length);
		return (hdrlen);
	}

if (!ndo->ndo_eflag) {
		if (ssap == dsap) {
			if (src == NULL || dst == NULL)
				ND_PRINT((ndo, "%s ", tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)));
			else
				ND_PRINT((ndo, "%s > %s %s ",
						(src->addr_string)(ndo, src->addr),
						(dst->addr_string)(ndo, dst->addr),
						tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)));
		} else {
			if (src == NULL || dst == NULL)
				ND_PRINT((ndo, "%s > %s ",
                                        tok2str(llc_values, "Unknown SSAP 0x%02x", ssap),
					tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)));
			else
				ND_PRINT((ndo, "%s %s > %s %s ",
					(src->addr_string)(ndo, src->addr),
                                        tok2str(llc_values, "Unknown SSAP 0x%02x", ssap),
					(dst->addr_string)(ndo, dst->addr),
					tok2str(llc_values, "Unknown DSAP 0x%02x", dsap)));
		}
	}

if (is_u) {
		ND_PRINT((ndo, "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 + hdrlen));

if ((control & ~LLC_U_POLL) == LLC_XID) {
			if (length == 0) {
				/*
				 * XID with no payload.
				 * This could, for example, be an SNA
				 * "short form" XID.
                                 */
				return (hdrlen);
			}
			if (caplen < 1) {
				ND_PRINT((ndo, "[|llc]"));
				if (caplen > 0)
					ND_DEFAULTPRINT((const u_char *)p, caplen);
				return (hdrlen);
			}
			if (*p == LLC_XID_FI) {
				if (caplen < 3 || length < 3) {
					ND_PRINT((ndo, "[|llc]"));
					if (caplen > 0)
						ND_DEFAULTPRINT((const u_char *)p, caplen);
				} else
					ND_PRINT((ndo, ": %02x %02x", p[1], p[2]));
				return (hdrlen);
			}
		}
	} else {
		if ((control & LLC_S_FMT) == LLC_S_FMT) {
			ND_PRINT((ndo, "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 + hdrlen));
			return (hdrlen);	/* no payload to print */
		} else {
			ND_PRINT((ndo, "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 + hdrlen));
		}
	}
	return (-hdrlen);
}

static const struct tok *
oui_to_struct_tok(uint32_t orgcode)
{
	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;
		}
	}
	return (tok);
}

int
snap_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen,
	const struct lladdr_info *src, const struct lladdr_info *dst,
	u_int bridge_pad)
{
	uint32_t orgcode;
	register u_short et;
	register int ret;

ND_TCHECK2(*p, 5);
	if (caplen < 5 || length < 5)
		goto trunc;
	orgcode = EXTRACT_24BITS(p);
	et = EXTRACT_16BITS(p + 3);

if (ndo->ndo_eflag) {
		/*
		 * Somebody's already printed the MAC addresses, if there
		 * are any, so just print the SNAP header, not the MAC
		 * addresses.
		 */
		ND_PRINT((ndo, "oui %s (0x%06x), %s %s (0x%04x), length %u: ",
		     tok2str(oui_values, "Unknown", orgcode),
		     orgcode,
		     (orgcode == 0x000000 ? "ethertype" : "pid"),
		     tok2str(oui_to_struct_tok(orgcode), "Unknown", et),
		     et, length - 5));
	}
	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(ndo, et, p, length, caplen, src, dst);
		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(ndo, et, p, length, caplen, src, dst);
			if (ret)
				return (ret);
		}
		break;

case OUI_CISCO:
                switch (et) {
                case PID_CISCO_CDP:
                        cdp_print(ndo, p, length, caplen);
                        return (1);
                case PID_CISCO_DTP:
                        dtp_print(ndo, p, length);
                        return (1);
                case PID_CISCO_UDLD:
                        udld_print(ndo, p, length);
                        return (1);
                case PID_CISCO_VTP:
                        vtp_print(ndo, p, length);
                        return (1);
                case PID_CISCO_PVST:
                case PID_CISCO_VLANBRIDGE:
                        stp_print(ndo, p, length);
                        return (1);
                default:
                        break;
                }
		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.
			 */
			ND_TCHECK2(*p, bridge_pad);
			caplen -= bridge_pad;
			length -= bridge_pad;
			p += bridge_pad;

/*
			 * What remains is an Ethernet packet.
			 */
			ether_print(ndo, 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.
			 */
			ND_TCHECK2(*p, bridge_pad);
			caplen -= bridge_pad;
			length -= bridge_pad;
			p += bridge_pad;

/*
			 * What remains is an 802.5 Token Ring
			 * packet.
			 */
			token_print(ndo, 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.
			 */
			ND_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(ndo, p, length, caplen);
			return (1);

case PID_RFC2684_BPDU:
			stp_print(ndo, p, length);
			return (1);
		}
	}
	if (!ndo->ndo_eflag) {
		/*
		 * Nobody printed the link-layer addresses, so print them, if
		 * we have any.
		 */
		if (src != NULL && dst != NULL) {
			ND_PRINT((ndo, "%s > %s ",
				(src->addr_string)(ndo, src->addr),
				(dst->addr_string)(ndo, dst->addr)));
		}
		/*
		 * Print the SNAP header, but if the OUI is 000000, don't
		 * bother printing it, and report the PID as being an
		 * ethertype.
		 */
		if (orgcode == 0x000000) {
			ND_PRINT((ndo, "SNAP, ethertype %s (0x%04x), length %u: ",
			     tok2str(ethertype_values, "Unknown", et),
			     et, length));
		} else {
			ND_PRINT((ndo, "SNAP, oui %s (0x%06x), pid %s (0x%04x), length %u: ",
			     tok2str(oui_values, "Unknown", orgcode),
			     orgcode,
			     tok2str(oui_to_struct_tok(orgcode), "Unknown", et),
			     et, length));
		}
	}
	return (0);

trunc:
	ND_PRINT((ndo, "[|snap]"));
	return (1);
}

/*
 * Local Variables:
 * c-style: whitesmith
 * c-basic-offset: 8
 * End:
 */

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