228 lines
6.2 KiB
C
228 lines
6.2 KiB
C
/*
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* BIRD -- OSPF
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*
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* (c) 1999 Ondrej Filip <feela@network.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_OSPF_H_
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#define _BIRD_OSPF_H_
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#include "lib/ip.h"
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#include "lib/lists.h"
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#include "lib/socket.h"
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#include "lib/timer.h"
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#include "lib/resource.h"
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#include "nest/protocol.h"
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#include "nest/iface.h"
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#define OSPF_PROTO 89
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#ifndef IPV6
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#define OSPF_VERSION 2
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#define AllSPFRouters ipa_from_u32(0xe0000005) /* 224.0.0.5 */
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#define AllDRouters ipa_from_u32(0xe0000006) /* 224.0.0.6 */
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#else
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#error Multicast address not defined in IPv6
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#endif
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struct proto_ospf {
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struct proto proto;
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list iface_list; /* Interfaces we really use */
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};
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struct ospf_config {
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struct proto_config c;
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u32 area; /* FIXME: Area ID !!! This is wrong !!!
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* Should respect interface */
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};
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struct ospf_iface {
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node n;
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struct proto_ospf *proto;
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struct iface *iface; /* Nest's iface */
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sock *hello_sk; /* Hello socket */
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sock *ip_sk; /* IP socket (for DD ...) */
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list neigh_list; /* List of neigbours */
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u32 area; /* OSPF Area */
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u16 cost; /* Cost of iface */
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u16 rxmtint; /* number of seconds between LSA retransmissions */
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u16 iftransdelay; /* The estimated number of seconds it takes to
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transmit a Link State Update Packet over this
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interface. LSAs contained in the update */
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u8 priority; /* A router priority for DR election */
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u16 helloint; /* number of seconds between hello sending */
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u16 waitint; /* number of sec before changing state from wait */
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u32 deadc; /* after "deadint" missing hellos is router dead */
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u16 autype;
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u8 aukey[8];
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u8 options;
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ip_addr drip; /* Designated router */
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u32 drid;
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ip_addr bdrip; /* Backup DR */
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u32 bdrid;
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u8 type; /* OSPF view of type */
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#define OSPF_IT_BCAST 0
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#define OSPF_IT_NBMA 1
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#define OSPF_IT_PTP 2
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#define OSPF_IT_VLINK 3
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u8 state; /* Interface state machine */
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#define OSPF_IS_DOWN 0 /* Not working */
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#define OSPF_IS_LOOP 1 /* Should never happen */
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#define OSPF_IS_WAITING 2 /* Waiting for Wait timer */
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#define OSPF_IS_PTP 3 /* PTP operational */
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#define OSPF_IS_DROTHER 4 /* I'm on BCAST or NBMA and I'm not DR */
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#define OSPF_IS_BACKUP 5 /* I'm BDR */
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#define OSPF_IS_DR 6 /* I'm DR */
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timer *wait_timer; /* WAIT timer */
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timer *hello_timer; /* HELLOINT timer */
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timer *rxmt_timer; /* RXMT timer */
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/* Default values for interface parameters */
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#define COST_D 10
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#define RXMTINT_D 5
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#define IFTRANSDELAY_D 1
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#define PRIORITY_D 1
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#define HELLOINT_D 10
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#define DEADC_D 4
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#define WAIT_DMH 3 /* Value of Wait timer - not found it in RFC
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* - using 3*HELLO
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*/
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};
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struct ospf_patt {
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struct iface_patt i;
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u16 cost;
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u8 mode;
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};
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struct ospf_packet {
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u8 version;
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u8 type;
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#define HELLO 1 /* Hello */
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#define DBDES 2 /* Database description */
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#define LSREQ 3 /* Link state request */
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#define LSUPD 4 /* Link state update */
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#define LSACK 5 /* Link state acknowledgement */
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u16 length;
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u32 routerid;
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u32 areaid;
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u16 checksum;
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u16 autype;
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u8 authetication[8];
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};
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struct ospf_hello_packet {
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struct ospf_packet ospf_packet;
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ip_addr netmask;
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u16 helloint;
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u8 options;
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u8 priority;
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u32 deadint;
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u32 dr;
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u32 bdr;
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};
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struct ospf_dbdes_packet {
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struct ospf_packet ospf_packet;
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u16 iface_mtu;
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u8 options;
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u8 imms; /* I, M, MS bits */
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#define DBDES_MS 1
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#define DBDES_M 2
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#define DBDES_I 4
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u32 ddseq;
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};
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struct ospf_lsaheader {
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u16 lsage; /* LS Age */
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u8 options;
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u8 lstype;
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u32 lsid;
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u32 advr; /* Advertising router */
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u32 lssn; /* LS Sequence number */
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u16 checksum;
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u16 length;
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};
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struct ospf_neighbor
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{
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node n;
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struct ospf_iface *ifa;
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u8 state;
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#define NEIGHBOR_DOWN 0
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#define NEIGHBOR_ATTEMPT 1
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#define NEIGHBOR_INIT 2
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#define NEIGHBOR_2WAY 3
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#define NEIGHBOR_EXSTART 4
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#define NEIGHBOR_EXCHANGE 5
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#define NEIGHBOR_LOADING 6
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#define NEIGHBOR_FULL 7
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timer *inactim; /* Inactivity timer */
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u8 imms; /* I, M, Master/slave received */
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u32 dds; /* DD Sequence number being sent */
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u32 ddr; /* last Dat Des packet received */
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u8 myimms; /* I, M Master/slave */
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u32 rid; /* Router ID */
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ip_addr ip; /* IP of it's interface */
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u8 priority; /* Priority */
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u8 options; /* Options received */
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u32 dr; /* Neigbour's idea of DR */
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u32 bdr; /* Neigbour's idea of BDR */
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u8 adj; /* built adjacency? */
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};
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/* Definitions for interface state machine */
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#define ISM_UP 0 /* Interface Up */
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#define ISM_WAITF 1 /* Wait timer fired */
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#define ISM_BACKS 2 /* Backup seen */
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#define ISM_NEICH 3 /* Neighbor change */
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#define ISM_LOOP 4 /* Loop indicated */
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#define ISM_UNLOOP 5 /* Unloop indicated */
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#define ISM_DOWN 6 /* Interface down */
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/* Definitions for neighbor state machine */
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#define INM_HELLOREC 0 /* Hello Received */
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#define INM_START 1 /* Neighbor start - for NBMA */
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#define INM_2WAYREC 2 /* 2-Way received */
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#define INM_NEGDONE 3 /* Negotiation done */
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#define INM_EXDONE 4 /* Exchange done */
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#define INM_BADLSREQ 5 /* Bad LS Request */
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#define INM_LOADDONE 6 /* Load done */
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#define INM_ADJOK 7 /* AdjOK? */
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#define INM_SEQMIS 8 /* Sequence number mismatch */
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#define INM_1WAYREC 9 /* 1-Way */
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#define INM_KILLNBR 10 /* Kill Neighbor */
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#define INM_INACTTIM 11 /* Inactivity timer */
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#define INM_LLDOWN 12 /* Line down */
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/* topology.c: Representation of network topology (LS graph) */
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struct top_hash_entry { /* Index for fast mapping (type,rtrid,LSid)->vertex */
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struct top_hash_entry *next; /* Next in hash chain */
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struct top_vertex *vertex;
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u32 lsa_id, rtr_id;
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u16 lsa_type;
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u16 pad;
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};
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struct top_graph {
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pool *pool; /* Pool we allocate from */
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slab *hash_slab; /* Slab for hash entries */
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struct top_hash_entry **hash_table; /* Hashing (modelled a`la fib) */
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unsigned int hash_size;
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unsigned int hash_order;
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unsigned int hash_mask;
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unsigned int hash_entries;
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unsigned int hash_entries_min, hash_entries_max;
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};
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struct top_graph *ospf_top_new(struct proto_ospf *);
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void ospf_top_free(struct top_graph *);
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void ospf_top_dump(struct top_graph *);
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struct top_hash_entry *ospf_hash_find(struct top_graph *, u32 lsa, u32 rtr, u32 type);
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struct top_hash_entry *ospf_hash_get(struct top_graph *, u32 lsa, u32 rtr, u32 type);
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void ospf_hash_delete(struct top_graph *, struct top_hash_entry *);
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#endif /* _BIRD_OSPF_H_ */
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