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+/*
+ * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
+ * 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.
+ *
+ * Hacked version of print-ether.c Larry Lile <lile@stdio.com>
+ *
+ * Further tweaked to more closely resemble print-fddi.c
+ * Guy Harris <guy@alum.mit.edu>
+ */
+
+/* \summary: Token Ring printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include <string.h>
+
+#include "netdissect.h"
+#include "extract.h"
+#include "addrtoname.h"
+
+/*
+ * Copyright (c) 1998, Larry Lile
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice unmodified, this list of conditions, and the following
+ * disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#define TOKEN_HDRLEN 14
+#define ROUTING_SEGMENT_MAX 16
+#define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80)
+#define FRAME_TYPE(trp) ((GET_U_1((trp)->token_fc) & 0xC0) >> 6)
+#define TOKEN_FC_LLC 1
+
+#define BROADCAST(trp) ((GET_BE_U_2((trp)->token_rcf) & 0xE000) >> 13)
+#define RIF_LENGTH(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x1f00) >> 8)
+#define DIRECTION(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x0080) >> 7)
+#define LARGEST_FRAME(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x0070) >> 4)
+#define RING_NUMBER(trp, x) ((GET_BE_U_2((trp)->token_rseg[x]) & 0xfff0) >> 4)
+#define BRIDGE_NUMBER(trp, x) (GET_BE_U_2((trp)->token_rseg[x]) & 0x000f)
+#define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2))
+
+struct token_header {
+ nd_uint8_t token_ac;
+ nd_uint8_t token_fc;
+ nd_mac_addr token_dhost;
+ nd_mac_addr token_shost;
+ nd_uint16_t token_rcf;
+ nd_uint16_t token_rseg[ROUTING_SEGMENT_MAX];
+};
+
+
+/* Extract src, dst addresses */
+static void
+extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
+{
+ memcpy(fdst, (const char *)trp->token_dhost, 6);
+ memcpy(fsrc, (const char *)trp->token_shost, 6);
+}
+
+/*
+ * Print the TR MAC header
+ */
+static void
+token_hdr_print(netdissect_options *ndo,
+ const struct token_header *trp, u_int length,
+ const u_char *fsrc, const u_char *fdst)
+{
+ const char *srcname, *dstname;
+
+ srcname = etheraddr_string(ndo, fsrc);
+ dstname = etheraddr_string(ndo, fdst);
+
+ if (!ndo->ndo_qflag)
+ ND_PRINT("%02x %02x ",
+ GET_U_1(trp->token_ac),
+ GET_U_1(trp->token_fc));
+ ND_PRINT("%s > %s, length %u: ",
+ srcname, dstname,
+ length);
+}
+
+static const char *broadcast_indicator[] = {
+ "Non-Broadcast", "Non-Broadcast",
+ "Non-Broadcast", "Non-Broadcast",
+ "All-routes", "All-routes",
+ "Single-route", "Single-route"
+};
+
+static const char *direction[] = {
+ "Forward", "Backward"
+};
+
+static const char *largest_frame[] = {
+ "516",
+ "1500",
+ "2052",
+ "4472",
+ "8144",
+ "11407",
+ "17800",
+ "??"
+};
+
+u_int
+token_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
+{
+ const struct token_header *trp;
+ int llc_hdrlen;
+ nd_mac_addr srcmac, dstmac;
+ struct lladdr_info src, dst;
+ u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
+ int seg;
+
+ ndo->ndo_protocol = "token-ring";
+ trp = (const struct token_header *)p;
+
+ if (caplen < TOKEN_HDRLEN) {
+ nd_print_trunc(ndo);
+ return hdr_len;
+ }
+
+ /*
+ * Get the TR addresses into a canonical form
+ */
+ extract_token_addrs(trp, (char*)srcmac, (char*)dstmac);
+
+ /* Adjust for source routing information in the MAC header */
+ if (IS_SOURCE_ROUTED(trp)) {
+ /* Clear source-routed bit */
+ srcmac[0] &= 0x7f;
+
+ if (ndo->ndo_eflag)
+ token_hdr_print(ndo, trp, length, srcmac, dstmac);
+
+ if (caplen < TOKEN_HDRLEN + 2) {
+ nd_print_trunc(ndo);
+ return hdr_len;
+ }
+ route_len = RIF_LENGTH(trp);
+ hdr_len += route_len;
+ if (caplen < hdr_len) {
+ nd_print_trunc(ndo);
+ return hdr_len;
+ }
+ if (ndo->ndo_vflag) {
+ ND_PRINT("%s ", broadcast_indicator[BROADCAST(trp)]);
+ ND_PRINT("%s", direction[DIRECTION(trp)]);
+
+ for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
+ ND_PRINT(" [%u:%u]", RING_NUMBER(trp, seg),
+ BRIDGE_NUMBER(trp, seg));
+ } else {
+ ND_PRINT("rt = %x", GET_BE_U_2(trp->token_rcf));
+
+ for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
+ ND_PRINT(":%x",
+ GET_BE_U_2(trp->token_rseg[seg]));
+ }
+ ND_PRINT(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
+ } else {
+ if (ndo->ndo_eflag)
+ token_hdr_print(ndo, trp, length, srcmac, dstmac);
+ }
+
+ src.addr = srcmac;
+ src.addr_string = etheraddr_string;
+ dst.addr = dstmac;
+ dst.addr_string = etheraddr_string;
+
+ /* Skip over token ring MAC header and routing information */
+ length -= hdr_len;
+ p += hdr_len;
+ caplen -= hdr_len;
+
+ /* Frame Control field determines interpretation of packet */
+ if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
+ /* Try to print the LLC-layer header & higher layers */
+ llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
+ if (llc_hdrlen < 0) {
+ /* packet type not known, print raw packet */
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p, caplen);
+ llc_hdrlen = -llc_hdrlen;
+ }
+ hdr_len += llc_hdrlen;
+ } else {
+ /* Some kinds of TR packet we cannot handle intelligently */
+ /* XXX - dissect MAC packets if frame type is 0 */
+ if (!ndo->ndo_eflag)
+ token_hdr_print(ndo, trp, length + TOKEN_HDRLEN + route_len,
+ srcmac, dstmac);
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p, caplen);
+ }
+ return (hdr_len);
+}
+
+/*
+ * This is the top level routine of the printer. 'p' points
+ * to the TR header of the packet, 'h->ts' is the timestamp,
+ * 'h->len' is the length of the packet off the wire, and 'h->caplen'
+ * is the number of bytes actually captured.
+ */
+void
+token_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
+{
+ ndo->ndo_protocol = "token-ring";
+ ndo->ndo_ll_hdr_len += token_print(ndo, p, h->len, h->caplen);
+}