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 enum isis_adj_usage {
  29         ISIS_ADJ_NONE,
  30         ISIS_ADJ_LEVEL1,
  31         ISIS_ADJ_LEVEL2,
  32         ISIS_ADJ_LEVEL1AND2
  33 };
  34
  35 enum isis_system_type {
  36         ISIS_SYSTYPE_UNKNOWN,
  37         ISIS_SYSTYPE_ES,
  38         ISIS_SYSTYPE_IS,
  39         ISIS_SYSTYPE_L1_IS,
  40         ISIS_SYSTYPE_L2_IS
  41 };
  42
  43 enum isis_adj_state {
  44         ISIS_ADJ_UNKNOWN,
  45         ISIS_ADJ_INITIALIZING,
  46         ISIS_ADJ_UP,
  47         ISIS_ADJ_DOWN
  48 };
  49
  50 /*
  51  * we use the following codes to give an indication _why_
  52  * a specific adjacency is up or down
  53  */
  54 enum isis_adj_updown_reason {
  55         ISIS_ADJ_REASON_SEENSELF,
  56         ISIS_ADJ_REASON_AREA_MISMATCH,
  57         ISIS_ADJ_REASON_HOLDTIMER_EXPIRED,
  58         ISIS_ADJ_REASON_AUTH_FAILED,
  59         ISIS_ADJ_REASON_CHECKSUM_FAILED
  60 };
  61
  62 #define DIS_RECORDS 8   /* keep the last 8 DIS state changes on record */
  63
  64 struct isis_dis_record {
  65         int dis;                /* is our neighbor the DIS ? */
  66         time_t last_dis_change; /* timestamp for last dis change */
  67 };
  68
  69 struct isis_adjacency {
  70         u_char snpa[ETH_ALEN];             /* NeighbourSNPAAddress */
  71         u_char sysid[ISIS_SYS_ID_LEN];     /* neighbourSystemIdentifier */
  72         u_char lanid[ISIS_SYS_ID_LEN + 1]; /* LAN id on bcast circuits */
  73         int dischanges[ISIS_LEVELS];       /* how many DIS changes ? */
  74         /* an array of N levels for M records */
  75         struct isis_dis_record dis_record[DIS_RECORDS * ISIS_LEVELS];
  76         enum isis_adj_state adj_state;    /* adjacencyState */
  77         enum isis_adj_usage adj_usage;    /* adjacencyUsage */
  78         struct area_addr *area_addresses; /* areaAdressesOfNeighbour */
  79         unsigned int area_address_count;
  80         struct nlpids nlpids; /* protocols spoken ... */
  81         struct in_addr *ipv4_addresses;
  82         unsigned int ipv4_address_count;
  83         struct in_addr router_address;
  84         struct in6_addr *ipv6_addresses;
  85         unsigned int ipv6_address_count;
  86         struct in6_addr router_address6;
  87         u_char prio[ISIS_LEVELS];       /* priorityOfNeighbour for DIS */
  88         int circuit_t;                  /* from hello PDU hdr */
  89         int level;                      /* level (1 or 2) */
  90         enum isis_system_type sys_type; /* neighbourSystemType */
  91         u_int16_t hold_time;            /* entryRemainingTime */
  92         u_int32_t last_upd;
  93         u_int32_t last_flap;      /* last time the adj flapped */
  94         int flaps;                    /* number of adjacency flaps  */
  95         struct thread *t_expire;      /* expire after hold_time  */
  96         struct isis_circuit *circuit; /* back pointer */
  97         uint16_t *mt_set;      /* Topologies this adjacency is valid for */
  98         unsigned int mt_count; /* Number of entries in mt_set */
  99 };
 100
 101 struct isis_adjacency *isis_adj_lookup(const u_char *sysid, struct list *adjdb);
 102 struct isis_adjacency *isis_adj_lookup_snpa(const u_char *ssnpa,
 103                                             struct list *adjdb);
 104 struct isis_adjacency *isis_new_adj(const u_char *id, const u_char *snpa,
 105                                     int level, struct isis_circuit *circuit);
 106 void isis_delete_adj(void *adj);
 107 void isis_adj_state_change(struct isis_adjacency *adj,
 108                            enum isis_adj_state state, const char *reason);
 109 void isis_adj_print(struct isis_adjacency *adj);
 110 int isis_adj_expire(struct thread *thread);
 111 void isis_adj_print_vty(struct isis_adjacency *adj, struct vty *vty,
 112                         char detail);
 113 void isis_adj_build_neigh_list(struct list *adjdb, struct list *list);
 114 void isis_adj_build_up_list(struct list *adjdb, struct list *list);
 115 int isis_adj_usage2levels(enum isis_adj_usage usage);
 116
 117 #endif /* ISIS_ADJACENCY_H */