Imported Upstream version 4.3.0upstream/4.3.0

1 files changed, 545 insertions, 0 deletions

diff --git a/print-llc.c b/print-llc.c
new file mode 100644
index 0000000..a193471
--- /dev/null
+++ b/print-llc.c
@@ -0,0 +1,545 @@
+/*
+ * 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:
+ */