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; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
23 */
24
25#ifndef _ZEBRA_ISIS_ADJACENCY_H
26#define _ZEBRA_ISIS_ADJACENCY_H
27
28enum isis_adj_usage
29{
30  ISIS_ADJ_NONE,
31  ISIS_ADJ_LEVEL1,
32  ISIS_ADJ_LEVEL2,
33  ISIS_ADJ_LEVEL1AND2
34};
35
36enum isis_system_type
37{
38  ISIS_SYSTYPE_UNKNOWN,
39  ISIS_SYSTYPE_ES,
40  ISIS_SYSTYPE_IS,
41  ISIS_SYSTYPE_L1_IS,
42  ISIS_SYSTYPE_L2_IS
43};
44
45enum isis_adj_state
46{
47  ISIS_ADJ_UNKNOWN,
48  ISIS_ADJ_INITIALIZING,
49  ISIS_ADJ_UP,
50  ISIS_ADJ_DOWN
51};
52
53/*
54 * we use the following codes to give an indication _why_
55 * a specific adjacency is up or down
56 */
57enum isis_adj_updown_reason
58{
59  ISIS_ADJ_REASON_SEENSELF,
60  ISIS_ADJ_REASON_AREA_MISMATCH,
61  ISIS_ADJ_REASON_HOLDTIMER_EXPIRED,
62  ISIS_ADJ_REASON_AUTH_FAILED,
63  ISIS_ADJ_REASON_CHECKSUM_FAILED
64};
65
66#define DIS_RECORDS 8	/* keep the last 8 DIS state changes on record */
67
68struct isis_dis_record
69{
70  int dis;			/* is our neighbor the DIS ? */
71  time_t last_dis_change;	/* timestamp for last dis change */
72};
73
74struct isis_adjacency
75{
76  u_char snpa[ETH_ALEN];		/* NeighbourSNPAAddress */
77  u_char sysid[ISIS_SYS_ID_LEN];	/* neighbourSystemIdentifier */
78  u_char lanid[ISIS_SYS_ID_LEN + 1];	/* LAN id on bcast circuits */
79  int dischanges[ISIS_LEVELS];		/* how many DIS changes ? */
80  /* an array of N levels for M records */
81  struct isis_dis_record dis_record[DIS_RECORDS * ISIS_LEVELS];
82  enum isis_adj_state adj_state;	/* adjacencyState */
83  enum isis_adj_usage adj_usage;	/* adjacencyUsage */
84  struct list *area_addrs;		/* areaAdressesOfNeighbour */
85  struct nlpids nlpids;			/* protocols spoken ... */
86  struct list *ipv4_addrs;
87  struct in_addr router_address;
88#ifdef HAVE_IPV6
89  struct list *ipv6_addrs;
90  struct in6_addr router_address6;
91#endif				/* HAVE_IPV6 */
92  u_char prio[ISIS_LEVELS];	/* priorityOfNeighbour for DIS */
93  int circuit_t;		/* from hello PDU hdr */
94  int level;			/* level (1 or 2) */
95  enum isis_system_type sys_type;	/* neighbourSystemType */
96  u_int16_t hold_time;		/* entryRemainingTime */
97  u_int32_t last_upd;
98  u_int32_t last_flap;		/* last time the adj flapped */
99  int flaps;			/* number of adjacency flaps  */
100  struct thread *t_expire;	/* expire after hold_time  */
101  struct isis_circuit *circuit;	/* back pointer */
102};
103
104struct isis_adjacency *isis_adj_lookup (u_char * sysid, struct list *adjdb);
105struct isis_adjacency *isis_adj_lookup_snpa (u_char * ssnpa,
106					     struct list *adjdb);
107struct isis_adjacency *isis_new_adj (u_char * id, u_char * snpa, int level,
108				     struct isis_circuit *circuit);
109void isis_delete_adj (void *adj);
110void isis_adj_state_change (struct isis_adjacency *adj,
111			    enum isis_adj_state state, const char *reason);
112void isis_adj_print (struct isis_adjacency *adj);
113int isis_adj_expire (struct thread *thread);
114void isis_adj_print_vty (struct isis_adjacency *adj, struct vty *vty, char detail);
115void isis_adj_build_neigh_list (struct list *adjdb, struct list *list);
116void isis_adj_build_up_list (struct list *adjdb, struct list *list);
117
118#endif /* ISIS_ADJACENCY_H */
119