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+/*
+ * IS-IS Rout(e)ing protocol - isis_constants.h
+ *
+ * Copyright (C) 2001,2002 Sampo Saaristo
+ * Tampere University of Technology
+ * Institute of Communications Engineering
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public Licenseas published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef ISIS_CONSTANTS_H
+#define ISIS_CONSTANTS_H
+
+/*
+ * Architectural constant values from p. 35 of ISO/IEC 10589
+ */
+
+#define MAX_LINK_METRIC 63
+#define MAX_PATH_METRIC 1023
+#define ISO_SAP 0xFE
+#define INTRADOMAIN_ROUTEING_SELECTOR 0
+#define SEQUENCE_MODULUS 4294967296
+#define RECEIVE_LSP_BUFFER_SIZE 1492
+
+/*
+ * implementation specific jitter values
+ */
+
+#define IIH_JITTER 25 /* % */
+#define MAX_AGE_JITTER 5 /* % */
+#define MAX_LSP_GEN_JITTER 5 /* % */
+#define CSNP_JITTER 10 /* % */
+#define PSNP_JITTER 10 /* % */
+
+#define RANDOM_SPREAD 100000.0
+
+/*
+ * Default values
+ * ISO - 10589
+ * Section 7.3.21 - Parameters
+ */
+#define MAX_AGE 1200
+#define ZERO_AGE_LIFETIME 60
+#define MAX_LSP_GEN_INTERVAL 900
+#define MIN_LSP_GEN_INTERVAL 30
+#define MIN_LSP_TRANS_INTERVAL 5
+#define ISIS_MIN_LSP_LIFETIME 380
+#define CSNP_INTERVAL 10
+#define PSNP_INTERVAL 2
+#define ISIS_MAX_PATH_SPLITS 3
+
+#define ISIS_LEVELS 2
+#define ISIS_LEVEL1 1
+#define ISIS_LEVEL2 2
+
+#define HELLO_INTERVAL 1
+#define HELLO_MINIMAL HELLO_INTERVAL
+#define HELLO_MULTIPLIER 3
+#define DEFAULT_PRIORITY 64
+/* different vendors implement different values 5-10 on average */
+#define LSP_GEN_INTERVAL_DEFAULT 10
+#define LSP_INTERVAL 33 /* msecs */
+#define DEFAULT_CIRCUIT_METRICS 10
+#define METRICS_UNSUPPORTED 0x80
+#define PERIODIC_SPF_INTERVAL 60 /* at the top of my head */
+#define MINIMUM_SPF_INTERVAL 5 /* .. same here */
+
+/*
+ * NLPID values
+ */
+#define NLPID_IP 204
+#define NLPID_IPV6 142
+
+/*
+ * Return values for functions
+ */
+#define ISIS_OK 0
+#define ISIS_WARNING 1
+#define ISIS_ERROR 2
+#define ISIS_CRITICAL 3
+
+/*
+ * IS-IS Circuit Types
+ */
+
+#define IS_LEVEL_1 1
+#define IS_LEVEL_2 2
+#define IS_LEVEL_1_AND_2 3
+
+#define SNPA_ADDRSTRLEN 18
+#define ISIS_SYS_ID_LEN 6
+#define SYSID_STRLEN 24
+
+/*
+ * LSP bit masks
+ */
+#define LSPBIT_P 0x80
+#define LSPBIT_ATT 0x78
+#define LSPBIT_OL 0x04
+#define LSPBIT_IST 0x03
+
+/*
+ * LSP bit masking macros
+ * taken from tcpdumps
+ * print-isoclns.c
+ */
+
+#define ISIS_MASK_LSP_OL_BIT(x) ((x)&0x4)
+#define ISIS_MASK_LSP_IS_L1_BIT(x) ((x)&0x1)
+#define ISIS_MASK_LSP_IS_L2_BIT(x) ((x)&0x2)
+#define ISIS_MASK_LSP_PARTITION_BIT(x) ((x)&0x80)
+#define ISIS_MASK_LSP_ATT_BITS(x) ((x)&0x78)
+#define ISIS_MASK_LSP_ATT_ERROR_BIT(x) ((x)&0x40)
+#define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x) ((x)&0x20)
+#define ISIS_MASK_LSP_ATT_DELAY_BIT(x) ((x)&0x10)
+#define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x) ((x)&0x8)
+
+#define LLC_LEN 3
+
+/* we need to be aware of the fact we are using ISO sized
+ * packets, using isomtu = mtu - LLC_LEN
+ */
+#define ISO_MTU(C) \
+ (C->circ_type==CIRCUIT_T_BROADCAST) ? \
+ (C->interface->mtu - LLC_LEN) : (C->interface->mtu)
+
+#ifndef ETH_ALEN
+#define ETH_ALEN 6
+#endif
+
+#endif /* ISIS_CONSTANTS_H */
+
+
+
+
+
+
+
+