/*
 * 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
#define NLPID_SNAP 128
#define NLPID_CLNP 129
#define NLPID_ESIS 130

/*
 * 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 */