isisd/isis_adjacency.h

   1 /*
   2  * IS-IS Rout(e)ing protocol - isis_adjacency.h
   3  *                             IS-IS adjacency handling
   4  *
   5  * Copyright (C) 2001,2002   Sampo Saaristo
   6  *                           Tampere University of Technology
   7  *                           Institute of Communications Engineering
   8  *
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public Licenseas published by the Free
  12  * Software Foundation; either version 2 of the License, or (at your option)
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  18  * more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; see the file COPYING; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  23  */
  24
  25 #ifndef _ZEBRA_ISIS_ADJACENCY_H
  26 #define _ZEBRA_ISIS_ADJACENCY_H
  27
  28 #include "isisd/isis_tlvs.h"
  29
  30 enum isis_adj_usage {
  31         ISIS_ADJ_NONE,
  32         ISIS_ADJ_LEVEL1,
  33         ISIS_ADJ_LEVEL2,
  34         ISIS_ADJ_LEVEL1AND2
  35 };
  36
  37 enum isis_system_type {
  38         ISIS_SYSTYPE_UNKNOWN,
  39         ISIS_SYSTYPE_ES,
  40         ISIS_SYSTYPE_IS,
  41         ISIS_SYSTYPE_L1_IS,
  42         ISIS_SYSTYPE_L2_IS
  43 };
  44
  45 enum isis_adj_state {
  46         ISIS_ADJ_UNKNOWN,
  47         ISIS_ADJ_INITIALIZING,
  48         ISIS_ADJ_UP,
  49         ISIS_ADJ_DOWN
  50 };
  51
  52 /*
  53  * we use the following codes to give an indication _why_
  54  * a specific adjacency is up or down
  55  */
  56 enum isis_adj_updown_reason {
  57         ISIS_ADJ_REASON_SEENSELF,
  58         ISIS_ADJ_REASON_AREA_MISMATCH,
  59         ISIS_ADJ_REASON_HOLDTIMER_EXPIRED,
  60         ISIS_ADJ_REASON_AUTH_FAILED,
  61         ISIS_ADJ_REASON_CHECKSUM_FAILED
  62 };
  63
  64 #define DIS_RECORDS 8   /* keep the last 8 DIS state changes on record */
  65
  66 struct isis_dis_record {
  67         int dis;                /* is our neighbor the DIS ? */
  68         time_t last_dis_change; /* timestamp for last dis change */
  69 };
  70
  71 struct bfd_session;
  72
  73 struct isis_adjacency {
  74         uint8_t snpa[ETH_ALEN];             /* NeighbourSNPAAddress */
  75         uint8_t sysid[ISIS_SYS_ID_LEN];     /* neighbourSystemIdentifier */
  76         uint8_t lanid[ISIS_SYS_ID_LEN + 1]; /* LAN id on bcast circuits */
  77         int dischanges[ISIS_LEVELS];       /* how many DIS changes ? */
  78         /* an array of N levels for M records */
  79         struct isis_dis_record dis_record[DIS_RECORDS * ISIS_LEVELS];
  80         enum isis_adj_state adj_state;    /* adjacencyState */
  81         enum isis_adj_usage adj_usage;    /* adjacencyUsage */
  82         struct area_addr *area_addresses; /* areaAdressesOfNeighbour */
  83         unsigned int area_address_count;
  84         struct nlpids nlpids; /* protocols spoken ... */
  85         struct in_addr *ipv4_addresses;
  86         unsigned int ipv4_address_count;
  87         struct in_addr router_address;
  88         struct in6_addr *ipv6_addresses;
  89         unsigned int ipv6_address_count;
  90         struct in6_addr router_address6;
  91         uint8_t prio[ISIS_LEVELS];      /* priorityOfNeighbour for DIS */
  92         int circuit_t;                  /* from hello PDU hdr */
  93         int level;                      /* level (1 or 2) */
  94         enum isis_system_type sys_type; /* neighbourSystemType */
  95         uint16_t hold_time;             /* entryRemainingTime */
  96         uint32_t last_upd;
  97         uint32_t last_flap; /* last time the adj flapped */
  98         enum isis_threeway_state threeway_state;
  99         uint32_t ext_circuit_id;
 100         int flaps;                    /* number of adjacency flaps  */
 101         struct thread *t_expire;      /* expire after hold_time  */
 102         struct isis_circuit *circuit; /* back pointer */
 103         uint16_t *mt_set;      /* Topologies this adjacency is valid for */
 104         unsigned int mt_count; /* Number of entries in mt_set */
 105         struct bfd_session *bfd_session;
 106 };
 107
 108 struct isis_threeway_adj;
 109
 110 struct isis_adjacency *isis_adj_lookup(const uint8_t *sysid,
 111                                        struct list *adjdb);
 112 struct isis_adjacency *isis_adj_lookup_snpa(const uint8_t *ssnpa,
 113                                             struct list *adjdb);
 114 struct isis_adjacency *isis_new_adj(const uint8_t *id, const uint8_t *snpa,
 115                                     int level, struct isis_circuit *circuit);
 116 void isis_delete_adj(void *adj);
 117 void isis_adj_process_threeway(struct isis_adjacency *adj,
 118                                struct isis_threeway_adj *tw_adj,
 119                                enum isis_adj_usage adj_usage);
 120 DECLARE_HOOK(isis_adj_state_change_hook, (struct isis_adjacency *adj), (adj))
 121 void isis_adj_state_change(struct isis_adjacency *adj,
 122                            enum isis_adj_state state, const char *reason);
 123 void isis_adj_print(struct isis_adjacency *adj);
 124 int isis_adj_expire(struct thread *thread);
 125 void isis_adj_print_vty(struct isis_adjacency *adj, struct vty *vty,
 126                         char detail);
 127 void isis_adj_build_neigh_list(struct list *adjdb, struct list *list);
 128 void isis_adj_build_up_list(struct list *adjdb, struct list *list);
 129 int isis_adj_usage2levels(enum isis_adj_usage usage);
 130
 131 #endif /* ISIS_ADJACENCY_H */