mirror of
https://gitlab.nic.cz/labs/bird.git
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608 lines
13 KiB
C
608 lines
13 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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#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 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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#define DEFAULTDES ipa_from_u32(0)
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#else
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#error OSPF for IPv6 is not implemented (mail to Feela <feela@network.cz>)
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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_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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};
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struct obits
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{
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#ifdef _BIG_ENDIAN
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u8 unused2:2;
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u8 dc:1;
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u8 ea:1;
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u8 np:1;
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u8 mc:1;
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u8 e:1;
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u8 unused1:1;
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#else
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u8 unused1:1;
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u8 e:1;
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u8 mc:1;
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u8 np:1;
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u8 ea:1;
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u8 dc:1;
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u8 unused2:2;
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#endif
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};
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union options
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{
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u8 byte;
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struct obits bit;
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};
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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 *hello_sk; /* Hello socket */
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sock *dr_sk; /* For states DR or BACKUP */
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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 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 autype;
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u16 helloint; /* number of seconds between hello sending */
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list *passwords;
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u32 csn; /* Crypt seq num. that will be sent net */
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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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#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 /* Value of Wait timer - not found it in RFC
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* - using 4*HELLO
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*/
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struct top_hash_entry *nlsa; /* Originated net lsa */
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int orignet; /* Schedule network LSA origination */
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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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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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struct ospf_packet
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{
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u8 version;
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u8 type;
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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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u16 length;
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u32 routerid;
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u32 areaid;
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#define BACKBONE 0
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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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struct ospf_hello_packet
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{
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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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ip_addr dr;
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ip_addr bdr;
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};
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struct immsb
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{
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#ifdef _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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struct ospf_dbdes_packet
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{
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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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union imms 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_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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u8 options;
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u8 type;
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u32 id;
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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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u32 rt; /* Advertising router */
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s32 sn; /* LS Sequence number */
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#define LSA_INITSEQNO 0x80000001
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#define LSA_MAXSEQNO 0x7fffffff
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u16 checksum;
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u16 length;
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};
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struct vebb
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{
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#ifdef _BIG_ENDIAN
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u8 padding:5;
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u8 v:1;
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u8 e:1;
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u8 b:1;
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#else
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u8 b:1;
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u8 e:1;
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u8 v:1;
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u8 padding:5;
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#endif
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};
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union veb
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{
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u8 byte;
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struct vebb bit;
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};
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struct ospf_lsa_rt
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{
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union veb veb;
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u8 padding;
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u16 links;
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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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u8 type;
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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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u8 notos;
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u16 metric;
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};
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struct ospf_lsa_rt_link_tos
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{ /* Actually we ignore TOS. This is useless */
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u8 tos;
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u8 padding;
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u16 metric;
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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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};
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struct ospf_lsa_sum
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{
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ip_addr netmask;
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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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};
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struct ospf_lsa_ext_etos
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{
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#ifdef _BIG_ENDIAN
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u8 ebit:1;
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u8 tos:7;
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u8 padding1;
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u16 padding2;
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#else
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u16 padding2;
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u8 padding1;
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u8 tos:7;
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u8 ebit:1;
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#endif
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};
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#define METRIC_MASK 0x00FFFFFF
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struct ospf_lsa_sum_tos
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{
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#ifdef _BIG_ENDIAN
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u8 tos;
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u8 padding1;
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u16 padding2;
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#else
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u16 padding2;
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u8 padding1;
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u8 tos;
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#endif
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};
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union ospf_lsa_sum_tm
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{
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struct ospf_lsa_sum_tos tos;
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u32 metric;
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};
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union ospf_lsa_ext_etm
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{
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struct ospf_lsa_ext_etos etos;
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u32 metric;
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};
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struct ospf_lsa_ext_tos
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{
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union ospf_lsa_ext_etm etm;
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ip_addr fwaddr;
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u32 tag;
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};
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struct ospf_lsreq_packet
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{
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struct ospf_packet ospf_packet;
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};
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struct ospf_lsreq_header
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{
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u16 padd1;
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u8 padd2;
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u8 type;
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u32 id;
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u32 rt; /* Advertising router */
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};
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struct l_lsr_head
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{
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node n;
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struct ospf_lsreq_header lsh;
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};
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struct ospf_lsupd_packet
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{
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struct ospf_packet ospf_packet;
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u32 lsano; /* Number of LSA's */
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};
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struct ospf_lsack_packet
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{
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struct ospf_packet ospf_packet;
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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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pool *pool;
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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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union imms 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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union imms 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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ip_addr dr; /* Neigbour's idea of DR */
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ip_addr bdr; /* Neigbour's idea of BDR */
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u8 adj; /* built adjacency? */
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siterator dbsi; /* Database summary list iterator */
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slist lsrql; /* Link state request */
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struct top_graph *lsrqh; /* LSA graph */
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siterator lsrqi;
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slist lsrtl; /* Link state retransmission list */
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siterator lsrti;
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struct top_graph *lsrth;
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void *ldbdes; /* Last database description packet */
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timer *rxmt_timer; /* RXMT timer */
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list ackl[2];
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#define ACKL_DIRECT 0
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#define ACKL_DELAY 1
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timer *ackd_timer; /* Delayed ack timer */
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u32 csn; /* Last received crypt seq number (for MD5) */
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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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struct ospf_area
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{
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node n;
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u32 areaid;
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int origrt; /* Rt lsa origination scheduled? */
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struct top_hash_entry *rt; /* My own router LSA */
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list cand; /* List of candidates for RT calc. */
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struct fib net_fib; /* Networks to advertise or not */
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int stub;
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int trcap; /* Transit capability? */
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struct proto_ospf *po;
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struct fib rtr; /* Routing tables for routers */
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union options opt; /* RFC2328 - A.2 */
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};
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struct proto_ospf
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{
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struct proto proto;
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timer *disp_timer; /* OSPF proto dispatcher */
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unsigned tick;
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struct top_graph *gr; /* LSA graph */
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slist lsal; /* List of all LSA's */
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int calcrt; /* Routing table calculation scheduled? */
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int cleanup; /* Should I cleanup after RT calculation? */
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list iface_list; /* Interfaces we really use */
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list area_list;
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int areano; /* Number of area I belong to */
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struct fib rtf; /* Routing table */
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int rfc1583; /* RFC1583 compatibility */
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int ebit; /* Did I originate any ext lsa? */
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struct ospf_area *backbone; /* If exists */
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};
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struct ospf_iface_patt
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{
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struct iface_patt i;
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u32 cost;
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u32 helloint;
|
|
u32 rxmtint;
|
|
u32 pollint;
|
|
u32 inftransdelay;
|
|
u32 priority;
|
|
u32 waitint;
|
|
u32 deadc;
|
|
u32 dead;
|
|
u32 type;
|
|
u32 autype;
|
|
u32 strictnbma;
|
|
u32 stub;
|
|
u32 vid;
|
|
#define OSPF_AUTH_NONE 0
|
|
#define OSPF_AUTH_SIMPLE 1
|
|
#define OSPF_AUTH_CRYPT 2
|
|
#define OSPF_AUTH_CRYPT_SIZE 16
|
|
u32 rxbuf;
|
|
#define OSPF_RXBUF_NORMAL 0
|
|
#define OSPF_RXBUF_LARGE 1
|
|
#define OSPF_RXBUF_MINSIZE 256 /* Minimal allowed size */
|
|
list *passwords;
|
|
list nbma_list;
|
|
};
|
|
|
|
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 ospf_rt_notify(struct proto *p, net *n, rte *new, rte *old,
|
|
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);
|
|
void ospf_sh_neigh(struct proto *p, char *iff);
|
|
void ospf_sh(struct proto *p);
|
|
void ospf_sh_iface(struct proto *p, char *iff);
|
|
|
|
#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_ */
|