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_RETRANS_INTERVAL      5 /* Seconds */
  77
  78 #define TRIGGERED_IIH_DELAY           50        /* msec */
  79
  80 #define MIN_CSNP_INTERVAL             1
  81 #define MAX_CSNP_INTERVAL             600
  82 #define DEFAULT_CSNP_INTERVAL         10
  83
  84 #define MIN_PSNP_INTERVAL             1
  85 #define MAX_PSNP_INTERVAL             120
  86 #define DEFAULT_PSNP_INTERVAL         2
  87
  88 #define MIN_HELLO_INTERVAL            1
  89 #define MAX_HELLO_INTERVAL            600
  90 #define DEFAULT_HELLO_INTERVAL        3
  91
  92 #define MIN_HELLO_MULTIPLIER          2
  93 #define MAX_HELLO_MULTIPLIER          100
  94 #define DEFAULT_HELLO_MULTIPLIER      10
  95
  96 #define MIN_PRIORITY                  0
  97 #define MAX_PRIORITY                  127
  98 #define DEFAULT_PRIORITY              64
  99
 100 /* min and max metric varies by new vs old metric types */
 101 #define DEFAULT_CIRCUIT_METRIC        10
 102
 103 #define METRICS_UNSUPPORTED           0x80
 104
 105 #define MINIMUM_SPF_INTERVAL          1
 106
 107 #define ISIS_MAX_PATH_SPLITS          64
 108
 109 /*
 110  * NLPID values
 111  */
 112 #define NLPID_IP   204
 113 #define NLPID_IPV6 142
 114 #define NLPID_SNAP 128
 115 #define NLPID_CLNP 129
 116 #define NLPID_ESIS 130
 117
 118 /*
 119  * Return values for functions
 120  */
 121 #define ISIS_OK       0
 122 #define ISIS_WARNING  1
 123 #define ISIS_ERROR    2
 124 #define ISIS_CRITICAL 3
 125
 126 /*
 127  * IS-IS Circuit Types
 128  */
 129
 130 #define IS_LEVEL_1       1
 131 #define IS_LEVEL_2       2
 132 #define IS_LEVEL_1_AND_2 3
 133
 134 #define SNPA_ADDRSTRLEN 18
 135 #define ISIS_SYS_ID_LEN  6
 136 #define ISIS_NSEL_LEN    1
 137 #define SYSID_STRLEN    24
 138
 139 /*
 140  * LSP bit masks
 141  */
 142 #define LSPBIT_P   0x80
 143 #define LSPBIT_ATT 0x78
 144 #define LSPBIT_OL  0x04
 145 #define LSPBIT_IST 0x03
 146
 147 /*
 148  * LSP bit masking macros
 149  * taken from tcpdumps
 150  * print-isoclns.c
 151  */
 152
 153 #define ISIS_MASK_LSP_OL_BIT(x)            ((x)&0x4)
 154 #define ISIS_MASK_LSP_IS_L1_BIT(x)         ((x)&0x1)
 155 #define ISIS_MASK_LSP_IS_L2_BIT(x)         ((x)&0x2)
 156 #define ISIS_MASK_LSP_PARTITION_BIT(x)     ((x)&0x80)
 157 #define ISIS_MASK_LSP_ATT_BITS(x)          ((x)&0x78)
 158 #define ISIS_MASK_LSP_ATT_ERROR_BIT(x)     ((x)&0x40)
 159 #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x)   ((x)&0x20)
 160 #define ISIS_MASK_LSP_ATT_DELAY_BIT(x)     ((x)&0x10)
 161 #define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x)   ((x)&0x8)
 162
 163 #define LLC_LEN 3
 164
 165 /* we need to be aware of the fact we are using ISO sized
 166  * packets, using isomtu = mtu - LLC_LEN
 167  */
 168 #define ISO_MTU(C)                                                             \
 169         ((if_is_broadcast((C)->interface)) ? (C->interface->mtu - LLC_LEN)     \
 170                                            : (C->interface->mtu))
 171
 172 #define MAX_LLC_LEN 0x5ff
 173 #define ETHERTYPE_EXT_LLC 0x8870
 174
 175 static inline uint16_t isis_ethertype(size_t len)
 176 {
 177         if (len > MAX_LLC_LEN)
 178                 return ETHERTYPE_EXT_LLC;
 179         return len;
 180 }
 181
 182 #endif /* ISIS_CONSTANTS_H */