isisd/isis_constants.h

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * IS-IS Rout(e)ing protocol - isis_constants.h
   4  *
   5  * Copyright (C) 2001,2002   Sampo Saaristo
   6  *                           Tampere University of Technology
   7  *                           Institute of Communications Engineering
   8  */
   9
  10 #ifndef ISIS_CONSTANTS_H
  11 #define ISIS_CONSTANTS_H
  12
  13 /*
  14  * Architectural constant values from p. 35 of ISO/IEC 10589
  15  */
  16
  17 #define MAX_NARROW_LINK_METRIC        63
  18 #define MAX_NARROW_PATH_METRIC        1023
  19 #define MAX_WIDE_LINK_METRIC          0x00FFFFFF  /* RFC4444 */
  20 #define MAX_WIDE_PATH_METRIC          0xFE000000  /* RFC3787 */
  21 #define ISO_SAP                       0xFE
  22 #define INTRADOMAIN_ROUTEING_SELECTOR 0
  23 #define SEQUENCE_MODULUS              4294967296
  24
  25 #define ISO9542_ESIS                    0x82
  26 #define ISO10589_ISIS                   0x83
  27
  28 /*
  29  * implementation specific jitter values
  30  */
  31
  32 #define IIH_JITTER                    10        /* % */
  33 #define MAX_AGE_JITTER                 5        /* % */
  34 #define MAX_LSP_GEN_JITTER             5        /* % */
  35 #define CSNP_JITTER                   10        /* % */
  36 #define PSNP_JITTER                   10        /* % */
  37
  38 #define RANDOM_SPREAD           100000.0
  39
  40 #define ISIS_LEVELS                   2
  41 #define ISIS_LEVEL1                   1
  42 #define ISIS_LEVEL2                   2
  43
  44 /*
  45  * Default values
  46  * ISO - 10589 Section 7.3.21 - Parameters
  47  * RFC 4444
  48  */
  49 #define MAX_AGE                       1200
  50 #define ZERO_AGE_LIFETIME             60
  51 #define MIN_LSP_LIFETIME              350
  52 #define MAX_LSP_LIFETIME              65535
  53 #define DEFAULT_LSP_LIFETIME          1200
  54
  55 #define MIN_MAX_LSP_GEN_INTERVAL      1
  56 #define MAX_MAX_LSP_GEN_INTERVAL      65235
  57 #define DEFAULT_MAX_LSP_GEN_INTERVAL  900
  58
  59 #define MIN_MIN_LSP_GEN_INTERVAL      1
  60 #define MAX_MIN_LSP_GEN_INTERVAL      120  /* RFC 4444 says 65535 */
  61 #define DEFAULT_MIN_LSP_GEN_INTERVAL  30
  62
  63 #define MIN_LSP_RETRANS_INTERVAL      5 /* Seconds */
  64
  65 #define TRIGGERED_IIH_DELAY           50        /* msec */
  66
  67 #define MIN_CSNP_INTERVAL             1
  68 #define MAX_CSNP_INTERVAL             600
  69 #define DEFAULT_CSNP_INTERVAL         10
  70
  71 #define MIN_PSNP_INTERVAL             1
  72 #define MAX_PSNP_INTERVAL             120
  73 #define DEFAULT_PSNP_INTERVAL         2
  74
  75 #define MIN_HELLO_INTERVAL            1
  76 #define MAX_HELLO_INTERVAL            600
  77 #define DEFAULT_HELLO_INTERVAL        3
  78
  79 #define MIN_HELLO_MULTIPLIER          2
  80 #define MAX_HELLO_MULTIPLIER          100
  81 #define DEFAULT_HELLO_MULTIPLIER      10
  82
  83 #define MIN_PRIORITY                  0
  84 #define MAX_PRIORITY                  127
  85 #define DEFAULT_PRIORITY              64
  86
  87 /* min and max metric varies by new vs old metric types */
  88 #define DEFAULT_CIRCUIT_METRIC        10
  89
  90 #define METRICS_UNSUPPORTED           0x80
  91
  92 #define MINIMUM_SPF_INTERVAL          1
  93
  94 #define ISIS_MAX_PATH_SPLITS          64
  95
  96 /*
  97  * NLPID values
  98  */
  99 #define NLPID_IP   204
 100 #define NLPID_IPV6 142
 101 #define NLPID_SNAP 128
 102 #define NLPID_CLNP 129
 103 #define NLPID_ESIS 130
 104
 105 /*
 106  * Return values for functions
 107  */
 108 #define ISIS_OK       0
 109 #define ISIS_WARNING  1
 110 #define ISIS_ERROR    2
 111 #define ISIS_CRITICAL 3
 112
 113 /*
 114  * IS-IS Circuit Types
 115  */
 116
 117 #define IS_LEVEL_1       1
 118 #define IS_LEVEL_2       2
 119 #define IS_LEVEL_1_AND_2 3
 120
 121 #define SNPA_ADDRSTRLEN 18
 122 #define ISIS_SYS_ID_LEN  6
 123 #define ISIS_NSEL_LEN    1
 124 #define SYSID_STRLEN    24
 125
 126 /*
 127  * LSP bit masks
 128  */
 129 #define LSPBIT_P   0x80
 130 #define LSPBIT_ATT 0x08 /* only use the Default ATT bit */
 131 #define LSPBIT_OL  0x04
 132 #define LSPBIT_IST 0x03
 133
 134 /*
 135  * LSP bit masking macros
 136  * taken from tcpdumps
 137  * print-isoclns.c
 138  */
 139
 140 #define ISIS_MASK_LSP_OL_BIT(x)            ((x)&0x4)
 141 #define ISIS_MASK_LSP_IS_L1_BIT(x)         ((x)&0x1)
 142 #define ISIS_MASK_LSP_IS_L2_BIT(x)         ((x)&0x2)
 143 #define ISIS_MASK_LSP_PARTITION_BIT(x)     ((x)&0x80)
 144 #define ISIS_MASK_LSP_ATT_BITS(x)          ((x)&0x78)
 145 #define ISIS_MASK_LSP_ATT_ERROR_BIT(x)     ((x)&0x40)
 146 #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x)   ((x)&0x20)
 147 #define ISIS_MASK_LSP_ATT_DELAY_BIT(x)     ((x)&0x10)
 148
 149 #define LLC_LEN 3
 150
 151 /* we need to be aware of the fact we are using ISO sized
 152  * packets, using isomtu = mtu - LLC_LEN
 153  */
 154 #define ISO_MTU(C)                                                             \
 155         ((if_is_broadcast((C)->interface)) ? (C->interface->mtu - LLC_LEN)     \
 156                                            : (C->interface->mtu))
 157
 158 #define MAX_LLC_LEN 0x5ff
 159 #define ETHERTYPE_EXT_LLC 0x8870
 160
 161 static inline uint16_t isis_ethertype(size_t len)
 162 {
 163         if (len > MAX_LLC_LEN)
 164                 return ETHERTYPE_EXT_LLC;
 165         return len;
 166 }
 167
 168 #endif /* ISIS_CONSTANTS_H */