--- /dev/null
+/*
+ * 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, and (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.
+ * 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.
+ *
+ */
+
+#ifndef lint
+static const char rcsid[] =
+ "@(#) $Header: /tcpdump/master/tcpdump/print-ldp.c,v 1.1 2002-12-13 00:40:35 hannes Exp $";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "interface.h"
+#include "extract.h"
+#include "addrtoname.h"
+#include "ethertype.h"
+
+/*
+ * ldp common header
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Version | PDU Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | LDP Identifier |
+ * + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ */
+
+struct ldp_common_header {
+ u_int8_t version[2];
+ u_int8_t pdu_length[2];
+ u_int8_t lsr_id[4];
+ u_int8_t label_space[2];
+};
+
+#define LDP_VERSION 1
+
+/*
+ * ldp tlv header
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |U|F| Type | Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * | Value |
+ * ~ ~
+ * | |
+ * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+struct ldp_tlv_header {
+ u_int8_t type[2];
+ u_int8_t length[2];
+};
+
+#define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff)
+#define LDP_MASK_TLV_U_BIT(x) ((x)&0x8000)
+#define LDP_MASK_TLV_F_BIT(x) ((x)&0x4000)
+
+#define LDP_TLV_FEC 0x0100
+#define LDP_TLV_ADDRESS_LIST 0x0101
+#define LDP_TLV_HOP_COUNT 0x0103
+#define LDP_TLV_PATH_VECTOR 0x0104
+#define LDP_TLV_GENERIC_LABEL 0x0200
+#define LDP_TLV_ATM_LABEL 0x0201
+#define LDP_TLV_FR_LABEL 0x0202
+#define LDP_TLV_STATUS 0x0300
+
+static const struct tok ldp_tlv_values[] = {
+ { LDP_TLV_FEC, "FEC" },
+ { LDP_TLV_ADDRESS_LIST, "Address List" },
+ { LDP_TLV_HOP_COUNT, "Hop Count" },
+ { LDP_TLV_HOP_COUNT, "Path Vector" },
+ { LDP_TLV_GENERIC_LABEL, "Generic Label" },
+ { LDP_TLV_ATM_LABEL, "ATM Label" },
+ { LDP_TLV_FR_LABEL, "Frame-Relay Label" },
+ { LDP_TLV_STATUS, "Status" },
+ { 0, NULL}
+};
+
+#define FALSE 0
+#define TRUE 1
+
+void
+ldp_print(register const u_char *pptr, register u_int len) {
+
+ const struct ldp_common_header *ldp_com_header;
+ const struct ldp_tlv_header *ldp_tlv_header;
+ const u_char *tptr,*tlv_tptr;
+ u_short tlen,tlv_len,tlv_type,tlv_tlen;
+ int hexdump;
+
+ tptr=pptr;
+ ldp_com_header = (const struct ldp_common_header *)pptr;
+ TCHECK(*ldp_com_header);
+
+ /*
+ * Sanity checking of the header.
+ */
+ if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
+ printf("LDP version %u packet not supported",
+ EXTRACT_16BITS(&ldp_com_header->version));
+ return;
+ }
+
+ /* print the LSR-ID, label-space & length */
+ printf("%sLDP, Label-Space-ID: %s:%u, length: %u",
+ (vflag < 1) ? "" : "\n\t",
+ ipaddr_string(&ldp_com_header->lsr_id),
+ EXTRACT_16BITS(&ldp_com_header->label_space),
+ len);
+
+ /* bail out if non-verbose */
+ if (vflag < 1)
+ return;
+
+ /* ok they seem to want to know everything - lets fully decode it */
+ tlen=EXTRACT_16BITS(ldp_com_header->pdu_length);
+
+ tptr+=sizeof(const struct ldp_common_header);
+ tlen-=sizeof(const struct ldp_common_header);
+
+ while(tlen>0) {
+ /* did we capture enough for fully decoding the tlv header ? */
+ if (!TTEST2(*tptr, sizeof(struct ldp_tlv_header)))
+ goto trunc;
+
+ ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
+ tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
+ tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
+
+ printf("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
+ tok2str(ldp_tlv_values,
+ "Unknown",
+ tlv_type),
+ tlv_type,
+ tlv_len,
+ LDP_MASK_TLV_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore all, notify",
+ LDP_MASK_TLV_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't");
+
+ tlv_tptr=tptr+sizeof(struct ldp_tlv_header);
+ tlv_tlen=tlv_len-sizeof(struct ldp_tlv_header);
+
+ /* did we capture enough for fully decoding the object ? */
+ if (!TTEST2(*tptr, tlv_len))
+ goto trunc;
+ hexdump=FALSE;
+
+ switch(tlv_type) {
+
+ /*
+ * FIXME those are the defined objects that lack a decoder
+ * you are welcome to contribute code ;-)
+ */
+
+ case LDP_TLV_FEC:
+ case LDP_TLV_ADDRESS_LIST:
+ case LDP_TLV_HOP_COUNT:
+ case LDP_TLV_PATH_VECTOR:
+ case LDP_TLV_GENERIC_LABEL:
+ case LDP_TLV_ATM_LABEL:
+ case LDP_TLV_FR_LABEL:
+ case LDP_TLV_STATUS:
+ default:
+ if (vflag <= 1)
+ print_unknown_data(tlv_tptr,"\n\t ",tlv_tlen);
+ break;
+ }
+ /* do we want to see an additionally hexdump ? */
+ if (vflag > 1 || hexdump==TRUE)
+ print_unknown_data(tptr+sizeof(sizeof(struct ldp_tlv_header)),"\n\t ",
+ tlv_len-sizeof(struct ldp_tlv_header));
+
+ tptr+=tlv_len;
+ tlen-=tlv_len;
+ }
+ return;
+trunc:
+ printf("\n\t\t packet exceeded snapshot");
+}
+
projects / tcpdump / commitdiff
