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The purpose of the Attach-bit is to accomplish inter-area routing. In other venders, the Attached-bit is automatically set when a router is configured as a L1|L2 router and has two adjacencies. When a L1 router receives a LSP with the Attached-bit set it is supposed to create a default route pointing toward the neighbor to provide a default path out of the L1 area. ISIS implementation has been fixed to support the above definition: Setting the Attach-bit is now the default behavior and we allow the user to turn it off. We will only set the Default Attach-bit when creating a L1 LSP, if we are a L1|L2 router and have a L2 adjacency up. When a L1 router receives a LSP with the Attach-bit set, we will create a default route pointing to the L1|L2 router as the nexthop. The default route will be removed if the LSP is received with the Attach-bit cleared. Signed-off-by: Lynne Morrison <lynne@voltanet.io>
182 lines
5.0 KiB
C
182 lines
5.0 KiB
C
/*
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* IS-IS Rout(e)ing protocol - isis_constants.h
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*
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* Copyright (C) 2001,2002 Sampo Saaristo
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* Tampere University of Technology
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* Institute of Communications Engineering
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public Licenseas published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef ISIS_CONSTANTS_H
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#define ISIS_CONSTANTS_H
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/*
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* Architectural constant values from p. 35 of ISO/IEC 10589
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*/
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#define MAX_NARROW_LINK_METRIC 63
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#define MAX_NARROW_PATH_METRIC 1023
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#define MAX_WIDE_LINK_METRIC 0x00FFFFFF /* RFC4444 */
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#define MAX_WIDE_PATH_METRIC 0xFE000000 /* RFC3787 */
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#define ISO_SAP 0xFE
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#define INTRADOMAIN_ROUTEING_SELECTOR 0
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#define SEQUENCE_MODULUS 4294967296
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#define ISO9542_ESIS 0x82
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#define ISO10589_ISIS 0x83
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/*
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* implementation specific jitter values
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*/
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#define IIH_JITTER 10 /* % */
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#define MAX_AGE_JITTER 5 /* % */
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#define MAX_LSP_GEN_JITTER 5 /* % */
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#define CSNP_JITTER 10 /* % */
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#define PSNP_JITTER 10 /* % */
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#define RANDOM_SPREAD 100000.0
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#define ISIS_LEVELS 2
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#define ISIS_LEVEL1 1
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#define ISIS_LEVEL2 2
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/*
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* Default values
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* ISO - 10589 Section 7.3.21 - Parameters
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* RFC 4444
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*/
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#define MAX_AGE 1200
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#define ZERO_AGE_LIFETIME 60
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#define MIN_LSP_LIFETIME 350
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#define MAX_LSP_LIFETIME 65535
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#define DEFAULT_LSP_LIFETIME 1200
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#define MIN_MAX_LSP_GEN_INTERVAL 1
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#define MAX_MAX_LSP_GEN_INTERVAL 65235
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#define DEFAULT_MAX_LSP_GEN_INTERVAL 900
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#define MIN_MIN_LSP_GEN_INTERVAL 1
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#define MAX_MIN_LSP_GEN_INTERVAL 120 /* RFC 4444 says 65535 */
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#define DEFAULT_MIN_LSP_GEN_INTERVAL 30
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#define MIN_LSP_RETRANS_INTERVAL 5 /* Seconds */
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#define TRIGGERED_IIH_DELAY 50 /* msec */
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#define MIN_CSNP_INTERVAL 1
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#define MAX_CSNP_INTERVAL 600
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#define DEFAULT_CSNP_INTERVAL 10
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#define MIN_PSNP_INTERVAL 1
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#define MAX_PSNP_INTERVAL 120
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#define DEFAULT_PSNP_INTERVAL 2
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#define MIN_HELLO_INTERVAL 1
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#define MAX_HELLO_INTERVAL 600
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#define DEFAULT_HELLO_INTERVAL 3
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#define MIN_HELLO_MULTIPLIER 2
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#define MAX_HELLO_MULTIPLIER 100
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#define DEFAULT_HELLO_MULTIPLIER 10
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#define MIN_PRIORITY 0
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#define MAX_PRIORITY 127
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#define DEFAULT_PRIORITY 64
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/* min and max metric varies by new vs old metric types */
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#define DEFAULT_CIRCUIT_METRIC 10
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#define METRICS_UNSUPPORTED 0x80
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#define MINIMUM_SPF_INTERVAL 1
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#define ISIS_MAX_PATH_SPLITS 64
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/*
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* NLPID values
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*/
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#define NLPID_IP 204
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#define NLPID_IPV6 142
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#define NLPID_SNAP 128
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#define NLPID_CLNP 129
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#define NLPID_ESIS 130
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/*
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* Return values for functions
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*/
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#define ISIS_OK 0
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#define ISIS_WARNING 1
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#define ISIS_ERROR 2
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#define ISIS_CRITICAL 3
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/*
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* IS-IS Circuit Types
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*/
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#define IS_LEVEL_1 1
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#define IS_LEVEL_2 2
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#define IS_LEVEL_1_AND_2 3
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#define SNPA_ADDRSTRLEN 18
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#define ISIS_SYS_ID_LEN 6
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#define ISIS_NSEL_LEN 1
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#define SYSID_STRLEN 24
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/*
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* LSP bit masks
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*/
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#define LSPBIT_P 0x80
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#define LSPBIT_ATT 0x08 /* only use the Default ATT bit */
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#define LSPBIT_OL 0x04
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#define LSPBIT_IST 0x03
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/*
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* LSP bit masking macros
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* taken from tcpdumps
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* print-isoclns.c
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*/
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#define ISIS_MASK_LSP_OL_BIT(x) ((x)&0x4)
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#define ISIS_MASK_LSP_IS_L1_BIT(x) ((x)&0x1)
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#define ISIS_MASK_LSP_IS_L2_BIT(x) ((x)&0x2)
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#define ISIS_MASK_LSP_PARTITION_BIT(x) ((x)&0x80)
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#define ISIS_MASK_LSP_ATT_BITS(x) ((x)&0x78)
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#define ISIS_MASK_LSP_ATT_ERROR_BIT(x) ((x)&0x40)
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#define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x) ((x)&0x20)
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#define ISIS_MASK_LSP_ATT_DELAY_BIT(x) ((x)&0x10)
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#define LLC_LEN 3
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/* we need to be aware of the fact we are using ISO sized
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* packets, using isomtu = mtu - LLC_LEN
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*/
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#define ISO_MTU(C) \
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((if_is_broadcast((C)->interface)) ? (C->interface->mtu - LLC_LEN) \
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: (C->interface->mtu))
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#define MAX_LLC_LEN 0x5ff
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#define ETHERTYPE_EXT_LLC 0x8870
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static inline uint16_t isis_ethertype(size_t len)
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{
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if (len > MAX_LLC_LEN)
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return ETHERTYPE_EXT_LLC;
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return len;
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}
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#endif /* ISIS_CONSTANTS_H */
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