809 lines
17 KiB
C
809 lines
17 KiB
C
/*
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* BIRD -- OSPF
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*
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* (c) 1999--2005 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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#define MAXNETS 10
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#define OSPF_VLINK_MTU 576 /* RFC2328 - A.1 */
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#define OSPF_MAX_PKT_SIZE 65536
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/*
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* RFC 2328 says, maximum packet size is 65535
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* This could be too much for small systems, so I
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* normally allocate 2*mtu - (I found one cisco
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* sending packets mtu+16)
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*/
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#ifdef LOCAL_DEBUG
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#define OSPF_FORCE_DEBUG 1
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#else
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#define OSPF_FORCE_DEBUG 0
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#endif
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#define OSPF_TRACE(flags, msg, args...) do { if ((p->debug & flags) || OSPF_FORCE_DEBUG) \
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log(L_TRACE "%s: " msg, p->name , ## args ); } while(0)
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#define OSPF_PACKET(dumpfn, buffer, msg, args...) \
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do { if ((p->debug & D_PACKETS) || OSPF_FORCE_DEBUG) \
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{ log(L_TRACE "%s: " msg, p->name, ## args ); dumpfn(p, buffer); } } while(0)
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#include "nest/bird.h"
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#include "lib/checksum.h"
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#include "lib/ip.h"
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#include "lib/lists.h"
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#include "lib/slists.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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#include "nest/route.h"
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#include "nest/cli.h"
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#include "nest/locks.h"
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#include "conf/conf.h"
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#include "lib/string.h"
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#define OSPF_PROTO 89
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#ifndef IPV6
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#define OSPFv2 1
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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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#define OSPFv3 1
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#define OSPF_VERSION 3
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#define AllSPFRouters _MI(0xFF020000, 0, 0, 5) /* FF02::5 */
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#define AllDRouters _MI(0xFF020000, 0, 0, 6) /* FF02::6 */
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#endif
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#define LSREFRESHTIME 1800 /* 30 minutes */
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#define MINLSINTERVAL 5
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#define MINLSARRIVAL 1
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#define LSINFINITY 0xffffff
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#define DEFAULT_OSPFTICK 1
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#define DEFAULT_RFC1583 0 /* compatibility with rfc1583 */
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#define DEFAULT_STUB_COST 1000
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struct ospf_config
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{
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struct proto_config c;
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unsigned tick;
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int rfc1583;
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list area_list;
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};
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struct nbma_node
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{
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node n;
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ip_addr ip;
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int eligible;
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};
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struct area_net_config
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{
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node n;
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struct prefix px;
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int hidden;
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};
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struct area_net
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{
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struct fib_node fn;
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int hidden;
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int active;
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u32 metric;
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};
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struct ospf_stubnet_config
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{
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node n;
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struct prefix px;
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int hidden, summary;
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u32 cost;
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};
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struct ospf_area_config
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{
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node n;
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u32 areaid;
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int stub;
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list patt_list;
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list vlink_list;
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list net_list;
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list stubnet_list;
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};
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/* Option flags */
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#define OPT_E 0x02
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#define OPT_N 0x08
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#define OPT_DC 0x20
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#ifdef OSPFv2
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#define OPT_EA 0x10
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/* VEB flags are are stored independently in 'u16 options' */
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#define OPT_RT_B (0x01 << 8)
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#define OPT_RT_E (0x02 << 8)
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#define OPT_RT_V (0x04 << 8)
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#endif
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#ifdef OSPFv3
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#define OPT_V6 0x01
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#define OPT_R 0x10
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/* VEB flags are are stored together with options in 'u32 options' */
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#define OPT_RT_B (0x01 << 24)
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#define OPT_RT_E (0x02 << 24)
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#define OPT_RT_V (0x04 << 24)
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#define OPT_RT_NT (0x10 << 24)
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#define OPT_PX_NU 0x01
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#define OPT_PX_LA 0x02
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#define OPT_PX_P 0x08
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#define OPT_PX_DN 0x10
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#endif
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struct ospf_iface
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{
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node n;
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struct iface *iface; /* Nest's iface */
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struct ospf_area *oa;
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struct object_lock *lock;
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sock *sk; /* IP socket (for DD ...) */
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list neigh_list; /* List of neigbours */
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u32 cost; /* Cost of iface */
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u32 waitint; /* number of sec before changing state from wait */
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u32 rxmtint; /* number of seconds between LSA retransmissions */
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u32 pollint; /* Poll interval */
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u32 dead; /* after "deadint" missing hellos is router dead */
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u32 vid; /* Id of peer of virtual link */
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ip_addr vip; /* IP of peer of virtual link */
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struct ospf_area *voa; /* Area wich the vlink goes through */
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u16 inftransdelay; /* 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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u16 helloint; /* number of seconds between hello sending */
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#ifdef OSPFv2
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list *passwords;
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u16 autype;
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u32 csn; /* Last used crypt seq number */
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bird_clock_t csn_use; /* Last time when packet with that CSN was sent */
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#endif
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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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#ifdef OSPFv3
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u32 dr_iface_id; /* if drid is valid, this is iface_id of DR (for connecting network) */
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u8 instance_id; /* Used to differentiate between more OSPF
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instances on one interface */
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ip_addr lladdr; /* Used link-local addr */
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#endif
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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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#define OSPF_IT_UNDEF 4
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u8 strictnbma; /* Can I talk with unknown neighbors? */
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u8 stub; /* Inactive interface */
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#define OSPF_I_OK 0 /* Everything OK */
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#define OSPF_I_MC 1 /* I didn't open MC socket */
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#define OSPF_I_IP 2 /* I didn't open IP socet */
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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 *poll_timer; /* Poll Interval - for NBMA */
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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 INFTRANSDELAY_D 1
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#define PRIORITY_D 1
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#define HELLOINT_D 10
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#define POLLINT_D 20
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#define DEADC_D 4
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#define WAIT_DMH 4
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/* Value of Wait timer - not found it in RFC * - using 4*HELLO */
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struct top_hash_entry *net_lsa; /* Originated network LSA */
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int orignet; /* Schedule network LSA origination */
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#ifdef OSPFv3
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int origlink; /* Schedule link LSA origination */
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struct top_hash_entry *link_lsa; /* Originated link LSA */
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struct top_hash_entry *pxn_lsa; /* Originated prefix LSA */
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#endif
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int fadj; /* Number of full adjacent neigh */
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list nbma_list;
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u8 priority; /* A router priority for DR election */
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u8 ioprob;
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u8 dr_up; /* Socket is a member of DRouters group */
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u32 rxbuf;
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};
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struct ospf_md5
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{
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u16 zero;
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u8 keyid;
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u8 len;
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u32 csn;
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};
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union ospf_auth
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{
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u8 password[8];
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struct ospf_md5 md5;
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};
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/* Packet types */
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#define HELLO_P 1 /* Hello */
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#define DBDES_P 2 /* Database description */
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#define LSREQ_P 3 /* Link state request */
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#define LSUPD_P 4 /* Link state update */
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#define LSACK_P 5 /* Link state acknowledgement */
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/* Area IDs */
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#define BACKBONE 0
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struct immsb
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{
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#ifdef CPU_BIG_ENDIAN
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u8 padding:5;
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u8 i:1;
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u8 m:1;
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u8 ms:1;
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#else
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u8 ms:1;
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u8 m:1;
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u8 i:1;
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u8 padding:5;
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#endif
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};
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union imms
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{
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u8 byte;
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struct immsb bit;
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};
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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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#ifdef OSPFv2
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struct ospf_packet
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{
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u8 version;
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u8 type;
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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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union ospf_auth u;
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};
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#else /* OSPFv3 packet descriptions */
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struct ospf_packet
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{
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u8 version;
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u8 type;
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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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u8 instance_id;
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u8 zero;
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};
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#endif
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struct ospf_lsa_header
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{
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u16 age; /* LS Age */
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#define LSA_MAXAGE 3600 /* 1 hour */
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#define LSA_CHECKAGE 300 /* 5 minutes */
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#define LSA_MAXAGEDIFF 900 /* 15 minutes */
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#ifdef OSPFv2
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u8 options;
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u8 type;
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#define LSA_T_RT 1
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#define LSA_T_NET 2
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#define LSA_T_SUM_NET 3
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#define LSA_T_SUM_RT 4
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#define LSA_T_EXT 5
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#define LSA_SCOPE_AREA 0x2000
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#define LSA_SCOPE_AS 0x4000
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#define LSA_SCOPE(lsa) (((lsa)->type == LSA_T_EXT) ? LSA_SCOPE_AS : LSA_SCOPE_AREA)
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#else /* OSPFv3 */
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u16 type;
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#define LSA_T_RT 0x2001
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#define LSA_T_NET 0x2002
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#define LSA_T_SUM_NET 0x2003
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#define LSA_T_SUM_RT 0x2004
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#define LSA_T_EXT 0x4005
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#define LSA_T_LINK 0x0008
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#define LSA_T_PREFIX 0x2009
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#define LSA_UBIT 0x8000
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#define LSA_SCOPE_LINK 0x0000
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#define LSA_SCOPE_AREA 0x2000
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#define LSA_SCOPE_AS 0x4000
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#define LSA_SCOPE_RES 0x6000
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#define LSA_SCOPE_MASK 0x6000
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#define LSA_SCOPE(lsa) ((lsa)->type & LSA_SCOPE_MASK)
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#endif
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u32 id;
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u32 rt; /* Advertising router */
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s32 sn; /* LS Sequence number */
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#define LSA_INITSEQNO ((s32) 0x80000001)
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#define LSA_MAXSEQNO ((s32) 0x7fffffff)
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u16 checksum;
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u16 length;
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};
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#define LSART_PTP 1
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#define LSART_NET 2
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#define LSART_STUB 3
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#define LSART_VLNK 4
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#ifdef OSPFv2
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struct ospf_lsa_rt
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{
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#ifdef CPU_BIG_ENDIAN
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u16 options; /* VEB flags only */
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u16 links;
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#else
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u16 links;
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u16 options; /* VEB flags only */
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#endif
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};
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struct ospf_lsa_rt_link
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{
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u32 id;
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u32 data;
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#ifdef CPU_BIG_ENDIAN
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u8 type;
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u8 padding;
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u16 metric;
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#else
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u16 metric;
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u8 padding;
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u8 type;
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#endif
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};
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struct ospf_lsa_net
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{
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ip_addr netmask;
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u32 routers[];
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};
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struct ospf_lsa_sum
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{
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ip_addr netmask;
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u32 metric;
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};
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struct ospf_lsa_ext
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{
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ip_addr netmask;
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u32 metric;
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ip_addr fwaddr;
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u32 tag;
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};
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#define LSA_SUM_TOS 0xFF000000
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#define LSA_EXT_TOS 0x7F000000
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#define LSA_EXT_EBIT 0x80000000
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/* Endianity swap for lsa->type */
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#define ntoht(x) x
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#define htont(x) x
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#else /* OSPFv3 */
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struct ospf_lsa_rt
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{
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u32 options;
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};
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struct ospf_lsa_rt_link
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{
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#ifdef CPU_BIG_ENDIAN
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u8 type;
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u8 padding;
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u16 metric;
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#else
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u16 metric;
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u8 padding;
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u8 type;
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#endif
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u32 lif; /* Local interface ID */
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u32 nif; /* Neighbor interface ID */
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u32 id; /* Neighbor router ID */
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};
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struct ospf_lsa_net
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{
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u32 options;
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u32 routers[];
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};
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struct ospf_lsa_sum_net
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{
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u32 metric;
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u32 prefix[];
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};
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struct ospf_lsa_sum_rt
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{
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u32 options;
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u32 metric;
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u32 drid;
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};
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struct ospf_lsa_ext
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{
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u32 metric;
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u32 rest[];
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};
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struct ospf_lsa_link
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{
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u32 options;
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ip_addr lladdr;
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u32 pxcount;
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u32 rest[];
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};
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struct ospf_lsa_prefix
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{
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#ifdef CPU_BIG_ENDIAN
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u16 pxcount;
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u16 ref_type;
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#else
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u16 ref_type;
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u16 pxcount;
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#endif
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u32 ref_id;
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u32 ref_rt;
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u32 rest[];
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};
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#define LSA_EXT_EBIT 0x4000000
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#define LSA_EXT_FBIT 0x2000000
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#define LSA_EXT_TBIT 0x1000000
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/* Endianity swap for lsa->type */
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#define ntoht(x) ntohs(x)
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#define htont(x) htons(x)
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#endif
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#define METRIC_MASK 0x00FFFFFF
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#define OPTIONS_MASK 0x00FFFFFF
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static inline unsigned
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lsa_rt_count(struct ospf_lsa_header *lsa)
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{
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return (lsa->length - sizeof(struct ospf_lsa_header) - sizeof(struct ospf_lsa_rt))
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/ sizeof(struct ospf_lsa_rt_link);
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}
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static inline unsigned
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lsa_net_count(struct ospf_lsa_header *lsa)
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{
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return (lsa->length - sizeof(struct ospf_lsa_header) - sizeof(struct ospf_lsa_net))
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/ sizeof(u32);
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}
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#ifdef OSPFv3
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#define IPV6_PREFIX_SPACE(x) ((((x) + 63) / 32) * 4)
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#define IPV6_PREFIX_WORDS(x) (((x) + 63) / 32)
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static inline u32 *
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lsa_get_ipv6_prefix(u32 *buf, ip_addr *addr, int *pxlen, u8 *pxopts, u16 *rest)
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{
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u8 pxl = (*buf >> 24);
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*pxopts = (*buf >> 16);
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*rest = *buf;
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*pxlen = pxl;
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buf++;
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*addr = IPA_NONE;
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if (pxl > 0)
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_I0(*addr) = *buf++;
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if (pxl > 32)
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_I1(*addr) = *buf++;
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if (pxl > 64)
|
|
_I2(*addr) = *buf++;
|
|
if (pxl > 96)
|
|
_I3(*addr) = *buf++;
|
|
|
|
return buf;
|
|
}
|
|
|
|
static inline u32 *
|
|
lsa_get_ipv6_addr(u32 *buf, ip_addr *addr)
|
|
{
|
|
*addr = *(ip_addr *) buf;
|
|
return buf + 4;
|
|
}
|
|
|
|
static inline u32 *
|
|
put_ipv6_prefix(u32 *buf, ip_addr addr, u8 pxlen, u8 pxopts, u16 lh)
|
|
{
|
|
*buf++ = ((pxlen << 24) | (pxopts << 16) | lh);
|
|
|
|
if (pxlen > 0)
|
|
*buf++ = _I0(addr);
|
|
if (pxlen > 32)
|
|
*buf++ = _I1(addr);
|
|
if (pxlen > 64)
|
|
*buf++ = _I2(addr);
|
|
if (pxlen > 96)
|
|
*buf++ = _I3(addr);
|
|
return buf;
|
|
}
|
|
|
|
static inline u32 *
|
|
put_ipv6_addr(u32 *buf, ip_addr addr)
|
|
{
|
|
*(ip_addr *) buf = addr;
|
|
return buf + 4;
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
struct ospf_lsreq_header
|
|
{
|
|
u32 type;
|
|
u32 id;
|
|
u32 rt; /* Advertising router */
|
|
};
|
|
|
|
struct l_lsr_head
|
|
{
|
|
node n;
|
|
struct ospf_lsreq_header lsh;
|
|
};
|
|
|
|
|
|
struct ospf_neighbor
|
|
{
|
|
node n;
|
|
pool *pool;
|
|
struct ospf_iface *ifa;
|
|
u8 state;
|
|
#define NEIGHBOR_DOWN 0
|
|
#define NEIGHBOR_ATTEMPT 1
|
|
#define NEIGHBOR_INIT 2
|
|
#define NEIGHBOR_2WAY 3
|
|
#define NEIGHBOR_EXSTART 4
|
|
#define NEIGHBOR_EXCHANGE 5
|
|
#define NEIGHBOR_LOADING 6
|
|
#define NEIGHBOR_FULL 7
|
|
timer *inactim; /* Inactivity timer */
|
|
union imms imms; /* I, M, Master/slave received */
|
|
u32 dds; /* DD Sequence number being sent */
|
|
u32 ddr; /* last Dat Des packet received */
|
|
union imms myimms; /* I, M Master/slave */
|
|
u32 rid; /* Router ID */
|
|
ip_addr ip; /* IP of it's interface */
|
|
u8 priority; /* Priority */
|
|
u8 adj; /* built adjacency? */
|
|
u32 options; /* Options received */
|
|
|
|
/* dr and bdr store IP address in OSPFv2 and router ID in OSPFv3,
|
|
we use the same type to simplify handling */
|
|
u32 dr; /* Neigbour's idea of DR */
|
|
u32 bdr; /* Neigbour's idea of BDR */
|
|
|
|
#ifdef OSPFv3
|
|
u32 iface_id; /* ID of Neighbour's iface connected to common network */
|
|
#endif
|
|
|
|
siterator dbsi; /* Database summary list iterator */
|
|
slist lsrql; /* Link state request */
|
|
struct top_graph *lsrqh; /* LSA graph */
|
|
siterator lsrqi;
|
|
slist lsrtl; /* Link state retransmission list */
|
|
siterator lsrti;
|
|
struct top_graph *lsrth;
|
|
void *ldbdes; /* Last database description packet */
|
|
timer *rxmt_timer; /* RXMT timer */
|
|
list ackl[2];
|
|
#define ACKL_DIRECT 0
|
|
#define ACKL_DELAY 1
|
|
timer *ackd_timer; /* Delayed ack timer */
|
|
u32 csn; /* Last received crypt seq number (for MD5) */
|
|
};
|
|
|
|
/* Definitions for interface state machine */
|
|
#define ISM_UP 0 /* Interface Up */
|
|
#define ISM_WAITF 1 /* Wait timer fired */
|
|
#define ISM_BACKS 2 /* Backup seen */
|
|
#define ISM_NEICH 3 /* Neighbor change */
|
|
#define ISM_LOOP 4 /* Loop indicated */
|
|
#define ISM_UNLOOP 5 /* Unloop indicated */
|
|
#define ISM_DOWN 6 /* Interface down */
|
|
|
|
/* Definitions for neighbor state machine */
|
|
#define INM_HELLOREC 0 /* Hello Received */
|
|
#define INM_START 1 /* Neighbor start - for NBMA */
|
|
#define INM_2WAYREC 2 /* 2-Way received */
|
|
#define INM_NEGDONE 3 /* Negotiation done */
|
|
#define INM_EXDONE 4 /* Exchange done */
|
|
#define INM_BADLSREQ 5 /* Bad LS Request */
|
|
#define INM_LOADDONE 6 /* Load done */
|
|
#define INM_ADJOK 7 /* AdjOK? */
|
|
#define INM_SEQMIS 8 /* Sequence number mismatch */
|
|
#define INM_1WAYREC 9 /* 1-Way */
|
|
#define INM_KILLNBR 10 /* Kill Neighbor */
|
|
#define INM_INACTTIM 11 /* Inactivity timer */
|
|
#define INM_LLDOWN 12 /* Line down */
|
|
|
|
struct ospf_area
|
|
{
|
|
node n;
|
|
u32 areaid;
|
|
struct ospf_area_config *ac; /* Related area config */
|
|
int origrt; /* Rt lsa origination scheduled? */
|
|
struct top_hash_entry *rt; /* My own router LSA */
|
|
struct top_hash_entry *pxr_lsa; /* Originated prefix LSA */
|
|
list cand; /* List of candidates for RT calc. */
|
|
struct fib net_fib; /* Networks to advertise or not */
|
|
int stub;
|
|
int trcap; /* Transit capability? */
|
|
u32 options; /* Optional features */
|
|
struct proto_ospf *po;
|
|
struct fib rtr; /* Routing tables for routers */
|
|
};
|
|
|
|
struct proto_ospf
|
|
{
|
|
struct proto proto;
|
|
timer *disp_timer; /* OSPF proto dispatcher */
|
|
unsigned tick;
|
|
struct top_graph *gr; /* LSA graph */
|
|
slist lsal; /* List of all LSA's */
|
|
int calcrt; /* Routing table calculation scheduled?
|
|
0=no, 1=normal, 2=forced reload */
|
|
int cleanup; /* Should I cleanup after RT calculation? */
|
|
list iface_list; /* Interfaces we really use */
|
|
list area_list;
|
|
int areano; /* Number of area I belong to */
|
|
struct fib rtf; /* Routing table */
|
|
int rfc1583; /* RFC1583 compatibility */
|
|
int ebit; /* Did I originate any ext lsa? */
|
|
struct ospf_area *backbone; /* If exists */
|
|
void *lsab; /* LSA buffer used when originating router LSAs */
|
|
int lsab_size, lsab_used;
|
|
u32 router_id;
|
|
};
|
|
|
|
struct ospf_iface_patt
|
|
{
|
|
struct iface_patt i;
|
|
u32 cost;
|
|
u32 helloint;
|
|
u32 rxmtint;
|
|
u32 pollint;
|
|
u32 inftransdelay;
|
|
u32 priority;
|
|
u32 waitint;
|
|
u32 deadc;
|
|
u32 dead;
|
|
u32 type;
|
|
u32 strictnbma;
|
|
u32 stub;
|
|
u32 vid;
|
|
u32 rxbuf;
|
|
#define OSPF_RXBUF_NORMAL 0
|
|
#define OSPF_RXBUF_LARGE 1
|
|
#define OSPF_RXBUF_MINSIZE 256 /* Minimal allowed size */
|
|
list nbma_list;
|
|
|
|
u32 autype; /* Not really used in OSPFv3 */
|
|
#define OSPF_AUTH_NONE 0
|
|
#define OSPF_AUTH_SIMPLE 1
|
|
#define OSPF_AUTH_CRYPT 2
|
|
#define OSPF_AUTH_CRYPT_SIZE 16
|
|
|
|
#ifdef OSPFv2
|
|
list *passwords;
|
|
#endif
|
|
|
|
#ifdef OSPFv3
|
|
u8 instance_id;
|
|
#endif
|
|
};
|
|
|
|
int ospf_import_control(struct proto *p, rte **new, ea_list **attrs,
|
|
struct linpool *pool);
|
|
struct ea_list *ospf_make_tmp_attrs(struct rte *rt, struct linpool *pool);
|
|
void ospf_store_tmp_attrs(struct rte *rt, struct ea_list *attrs);
|
|
void schedule_rt_lsa(struct ospf_area *oa);
|
|
void schedule_rtcalc(struct proto_ospf *po);
|
|
void schedule_net_lsa(struct ospf_iface *ifa);
|
|
|
|
#ifdef OSPFv3
|
|
void schedule_link_lsa(struct ospf_iface *ifa);
|
|
#else
|
|
static inline void schedule_link_lsa(struct ospf_iface *ifa) {}
|
|
#endif
|
|
|
|
void ospf_sh_neigh(struct proto *p, char *iff);
|
|
void ospf_sh(struct proto *p);
|
|
void ospf_sh_iface(struct proto *p, char *iff);
|
|
void ospf_sh_state(struct proto *p, int verbose);
|
|
|
|
|
|
#define EA_OSPF_METRIC1 EA_CODE(EAP_OSPF, 0)
|
|
#define EA_OSPF_METRIC2 EA_CODE(EAP_OSPF, 1)
|
|
#define EA_OSPF_TAG EA_CODE(EAP_OSPF, 2)
|
|
|
|
#include "proto/ospf/rt.h"
|
|
#include "proto/ospf/hello.h"
|
|
#include "proto/ospf/packet.h"
|
|
#include "proto/ospf/iface.h"
|
|
#include "proto/ospf/neighbor.h"
|
|
#include "proto/ospf/topology.h"
|
|
#include "proto/ospf/dbdes.h"
|
|
#include "proto/ospf/lsreq.h"
|
|
#include "proto/ospf/lsupd.h"
|
|
#include "proto/ospf/lsack.h"
|
|
#include "proto/ospf/lsalib.h"
|
|
|
|
#endif /* _BIRD_OSPF_H_ */
|