isisd/isis_constants.h

   1 /*
   2  * IS-IS Rout(e)ing protocol - isis_constants.h
   3  *
   4  * Copyright (C) 2001,2002   Sampo Saaristo
   5  *                           Tampere University of Technology
   6  *                           Institute of Communications Engineering
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public Licenseas published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; see the file COPYING; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #ifndef ISIS_CONSTANTS_H
  24 #define ISIS_CONSTANTS_H
  25
  26 /*
  27  * Architectural constant values from p. 35 of ISO/IEC 10589
  28  */
  29
  30 #define MAX_NARROW_LINK_METRIC        63
  31 #define MAX_NARROW_PATH_METRIC        1023
  32 #define MAX_WIDE_LINK_METRIC          0x00FFFFFF  /* RFC4444 */
  33 #define MAX_WIDE_PATH_METRIC          0xFE000000  /* RFC3787 */
  34 #define ISO_SAP                       0xFE
  35 #define INTRADOMAIN_ROUTEING_SELECTOR 0
  36 #define SEQUENCE_MODULUS              4294967296
  37
  38 #define ISO9542_ESIS                    0x82
  39 #define ISO10589_ISIS                   0x83
  40
  41 /*
  42  * implementation specific jitter values
  43  */
  44
  45 #define IIH_JITTER                    10        /* % */
  46 #define MAX_AGE_JITTER                 5        /* % */
  47 #define MAX_LSP_GEN_JITTER             5        /* % */
  48 #define CSNP_JITTER                   10        /* % */
  49 #define PSNP_JITTER                   10        /* % */
  50
  51 #define RANDOM_SPREAD           100000.0
  52
  53 #define ISIS_LEVELS                   2
  54 #define ISIS_LEVEL1                   1
  55 #define ISIS_LEVEL2                   2
  56
  57 /*
  58  * Default values
  59  * ISO - 10589 Section 7.3.21 - Parameters
  60  * RFC 4444
  61  */
  62 #define MAX_AGE                       1200
  63 #define ZERO_AGE_LIFETIME             60
  64 #define MIN_LSP_LIFETIME              350
  65 #define MAX_LSP_LIFETIME              65535
  66 #define DEFAULT_LSP_LIFETIME          1200
  67
  68 #define MIN_MAX_LSP_GEN_INTERVAL      1
  69 #define MAX_MAX_LSP_GEN_INTERVAL      65235
  70 #define DEFAULT_MAX_LSP_GEN_INTERVAL  900
  71
  72 #define MIN_MIN_LSP_GEN_INTERVAL      1
  73 #define MAX_MIN_LSP_GEN_INTERVAL      120  /* RFC 4444 says 65535 */
  74 #define DEFAULT_MIN_LSP_GEN_INTERVAL  30
  75
  76 #define MIN_LSP_TRANS_INTERVAL        5
  77
  78 #define MIN_CSNP_INTERVAL             1
  79 #define MAX_CSNP_INTERVAL             600
  80 #define DEFAULT_CSNP_INTERVAL         10
  81
  82 #define MIN_PSNP_INTERVAL             1
  83 #define MAX_PSNP_INTERVAL             120
  84 #define DEFAULT_PSNP_INTERVAL         2
  85
  86 #define MIN_HELLO_INTERVAL            1
  87 #define MAX_HELLO_INTERVAL            600
  88 #define DEFAULT_HELLO_INTERVAL        3
  89
  90 #define MIN_HELLO_MULTIPLIER          2
  91 #define MAX_HELLO_MULTIPLIER          100
  92 #define DEFAULT_HELLO_MULTIPLIER      10
  93
  94 #define MIN_PRIORITY                  0
  95 #define MAX_PRIORITY                  127
  96 #define DEFAULT_PRIORITY              64
  97
  98 /* min and max metric varies by new vs old metric types */
  99 #define DEFAULT_CIRCUIT_METRIC        10
 100
 101 #define METRICS_UNSUPPORTED           0x80
 102
 103 #define MINIMUM_SPF_INTERVAL          1
 104
 105 #define ISIS_MAX_PATH_SPLITS          64
 106
 107 /*
 108  * NLPID values
 109  */
 110 #define NLPID_IP   204
 111 #define NLPID_IPV6 142
 112 #define NLPID_SNAP 128
 113 #define NLPID_CLNP 129
 114 #define NLPID_ESIS 130
 115
 116 /*
 117  * Return values for functions
 118  */
 119 #define ISIS_OK       0
 120 #define ISIS_WARNING  1
 121 #define ISIS_ERROR    2
 122 #define ISIS_CRITICAL 3
 123
 124 /*
 125  * IS-IS Circuit Types
 126  */
 127
 128 #define IS_LEVEL_1       1
 129 #define IS_LEVEL_2       2
 130 #define IS_LEVEL_1_AND_2 3
 131
 132 #define SNPA_ADDRSTRLEN 18
 133 #define ISIS_SYS_ID_LEN  6
 134 #define ISIS_NSEL_LEN    1
 135 #define SYSID_STRLEN    24
 136
 137 /*
 138  * LSP bit masks
 139  */
 140 #define LSPBIT_P   0x80
 141 #define LSPBIT_ATT 0x78
 142 #define LSPBIT_OL  0x04
 143 #define LSPBIT_IST 0x03
 144
 145 /*
 146  * LSP bit masking macros
 147  * taken from tcpdumps
 148  * print-isoclns.c
 149  */
 150
 151 #define ISIS_MASK_LSP_OL_BIT(x)            ((x)&0x4)
 152 #define ISIS_MASK_LSP_IS_L1_BIT(x)         ((x)&0x1)
 153 #define ISIS_MASK_LSP_IS_L2_BIT(x)         ((x)&0x2)
 154 #define ISIS_MASK_LSP_PARTITION_BIT(x)     ((x)&0x80)
 155 #define ISIS_MASK_LSP_ATT_BITS(x)          ((x)&0x78)
 156 #define ISIS_MASK_LSP_ATT_ERROR_BIT(x)     ((x)&0x40)
 157 #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x)   ((x)&0x20)
 158 #define ISIS_MASK_LSP_ATT_DELAY_BIT(x)     ((x)&0x10)
 159 #define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x)   ((x)&0x8)
 160
 161 #define LLC_LEN 3
 162
 163 /* we need to be aware of the fact we are using ISO sized
 164  * packets, using isomtu = mtu - LLC_LEN
 165  */
 166 #define ISO_MTU(C) \
 167           ((if_is_broadcast ((C)->interface)) ? \
 168            (C->interface->mtu - LLC_LEN) : (C->interface->mtu))
 169
 170 #ifndef ETH_ALEN
 171 #define ETH_ALEN 6
 172 #endif
 173
 174 #define MAX_LLC_LEN 0x5ff
 175 #define ETHERTYPE_EXT_LLC 0x8870
 176
 177 static inline uint16_t isis_ethertype(size_t len)
 178 {
 179   if (len > MAX_LLC_LEN)
 180     return ETHERTYPE_EXT_LLC;
 181   return len;
 182 }
 183
 184 #endif /* ISIS_CONSTANTS_H */