/* * BIRD -- OSPF * * (c) 1999--2005 Ondrej Filip * * Can be freely distributed and used under the terms of the GNU GPL. */ #ifndef _BIRD_OSPF_H_ #define _BIRD_OSPF_H_ #define MAXNETS 10 #define OSPF_MAX_PKT_SIZE 65535 /* * RFC 2328 says, maximum packet size is 65535 (IP packet size * limit). Really a bit less for OSPF, because this contains also IP * header. This could be too much for small systems, so I normally * allocate 2*mtu (i found one cisco sending packets mtu+16). OSPF * packets are almost always sent small enough to not be fragmented. */ #ifdef LOCAL_DEBUG #define OSPF_FORCE_DEBUG 1 #else #define OSPF_FORCE_DEBUG 0 #endif #define OSPF_TRACE(flags, msg, args...) do { if ((p->debug & flags) || OSPF_FORCE_DEBUG) \ log(L_TRACE "%s: " msg, p->name , ## args ); } while(0) #define OSPF_PACKET(dumpfn, buffer, msg, args...) \ do { if ((p->debug & D_PACKETS) || OSPF_FORCE_DEBUG) \ { log(L_TRACE "%s: " msg, p->name, ## args ); dumpfn(p, buffer); } } while(0) #include "nest/bird.h" #include "lib/checksum.h" #include "lib/ip.h" #include "lib/lists.h" #include "lib/slists.h" #include "lib/socket.h" #include "lib/timer.h" #include "lib/resource.h" #include "nest/protocol.h" #include "nest/iface.h" #include "nest/route.h" #include "nest/cli.h" #include "nest/locks.h" #include "conf/conf.h" #include "lib/string.h" #define OSPF_PROTO 89 #ifndef IPV6 #define OSPFv2 1 #define OSPF_VERSION 2 #define OSPF_VLINK_MTU 576 /* RFC 2328 A.1 */ #define AllSPFRouters ipa_from_u32(0xe0000005) /* 224.0.0.5 */ #define AllDRouters ipa_from_u32(0xe0000006) /* 224.0.0.6 */ #else #define OSPFv3 1 #define OSPF_VERSION 3 #define OSPF_VLINK_MTU 1280 /* RFC 5340 A.1 */ #define AllSPFRouters _MI(0xFF020000, 0, 0, 5) /* FF02::5 */ #define AllDRouters _MI(0xFF020000, 0, 0, 6) /* FF02::6 */ #endif #define LSREFRESHTIME 1800 /* 30 minutes */ #define MINLSINTERVAL 5 #define MINLSARRIVAL 1 #define LSINFINITY 0xffffff #define DEFAULT_OSPFTICK 1 #define DEFAULT_RFC1583 0 /* compatibility with rfc1583 */ #define DEFAULT_STUB_COST 1000 #define DEFAULT_ECMP_LIMIT 16 #define DEFAULT_TRANSINT 40 struct ospf_config { struct proto_config c; unsigned tick; byte rfc1583; byte abr; int ecmp; list area_list; list vlink_list; }; struct nbma_node { node n; ip_addr ip; byte eligible; byte found; }; struct area_net_config { node n; struct prefix px; int hidden; u32 tag; }; struct area_net { struct fib_node fn; int hidden; int active; u32 metric; u32 tag; }; struct ospf_stubnet_config { node n; struct prefix px; int hidden, summary; u32 cost; }; struct ospf_area_config { node n; u32 areaid; u32 default_cost; /* Cost of default route for stub areas */ u8 type; /* Area type (standard, stub, NSSA), represented by option flags (OPT_E, OPT_N) */ u8 summary; /* Import summaries to this stub/NSSA area, valid for ABR */ u8 default_nssa; /* Generate default NSSA route for NSSA+summary area */ u8 translator; /* Translator role, for NSSA ABR */ u32 transint; /* Translator stability interval */ list patt_list; list net_list; /* List of aggregate networks for that area */ list enet_list; /* List of aggregate external (NSSA) networks */ list stubnet_list; /* List of stub networks added to Router LSA */ }; /* Option flags */ #define OPT_E 0x02 #define OPT_N 0x08 #define OPT_DC 0x20 #ifdef OSPFv2 #define OPT_P 0x08 /* flags P and N share position, see NSSA RFC */ #define OPT_EA 0x10 /* VEB flags are are stored independently in 'u16 options' */ #define OPT_RT_B (0x01 << 8) #define OPT_RT_E (0x02 << 8) #define OPT_RT_V (0x04 << 8) #define OPT_RT_NT (0x10 << 8) #endif #ifdef OSPFv3 #define OPT_V6 0x01 #define OPT_R 0x10 /* VEB flags are are stored together with options in 'u32 options' */ #define OPT_RT_B (0x01 << 24) #define OPT_RT_E (0x02 << 24) #define OPT_RT_V (0x04 << 24) #define OPT_RT_NT (0x10 << 24) #define OPT_PX_NU 0x01 #define OPT_PX_LA 0x02 #define OPT_PX_P 0x08 #define OPT_PX_DN 0x10 #endif struct ospf_iface { node n; struct iface *iface; /* Nest's iface */ struct ifa *addr; /* IP prefix associated with that OSPF iface */ struct ospf_area *oa; struct ospf_iface_patt *cf; pool *pool; sock *sk; /* IP socket (for DD ...) */ list neigh_list; /* List of neigbours */ u32 cost; /* Cost of iface */ u32 waitint; /* number of sec before changing state from wait */ u32 rxmtint; /* number of seconds between LSA retransmissions */ u32 pollint; /* Poll interval */ u32 deadint; /* after "deadint" missing hellos is router dead */ u32 vid; /* Id of peer of virtual link */ ip_addr vip; /* IP of peer of virtual link */ struct ospf_iface *vifa; /* OSPF iface which the vlink goes through */ struct ospf_area *voa; /* OSPF area which the vlink goes through */ u16 inftransdelay; /* The estimated number of seconds it takes to transmit a Link State Update Packet over this interface. LSAs contained in the update */ u16 helloint; /* number of seconds between hello sending */ #ifdef OSPFv2 list *passwords; u16 autype; u32 csn; /* Last used crypt seq number */ bird_clock_t csn_use; /* Last time when packet with that CSN was sent */ #endif ip_addr drip; /* Designated router */ ip_addr bdrip; /* Backup DR */ u32 drid; u32 bdrid; s16 rt_pos_beg; /* Position of iface in Router-LSA, begin, inclusive */ s16 rt_pos_end; /* Position of iface in Router-LSA, end, exclusive */ #ifdef OSPFv3 s16 px_pos_beg; /* Position of iface in Rt Prefix-LSA, begin, inclusive */ s16 px_pos_end; /* Position of iface in Rt Prefix-LSA, end, exclusive */ u32 dr_iface_id; /* if drid is valid, this is iface_id of DR (for connecting network) */ u8 instance_id; /* Used to differentiate between more OSPF instances on one interface */ #endif u8 type; /* OSPF view of type */ #define OSPF_IT_BCAST 0 #define OSPF_IT_NBMA 1 #define OSPF_IT_PTP 2 #define OSPF_IT_PTMP 3 #define OSPF_IT_VLINK 4 #define OSPF_IT_UNDEF 5 u8 strictnbma; /* Can I talk with unknown neighbors? */ u8 stub; /* Inactive interface */ u8 state; /* Interface state machine */ #define OSPF_IS_DOWN 0 /* Not working */ #define OSPF_IS_LOOP 1 /* Iface with no link */ #define OSPF_IS_WAITING 2 /* Waiting for Wait timer */ #define OSPF_IS_PTP 3 /* PTP operational */ #define OSPF_IS_DROTHER 4 /* I'm on BCAST or NBMA and I'm not DR */ #define OSPF_IS_BACKUP 5 /* I'm BDR */ #define OSPF_IS_DR 6 /* I'm DR */ timer *wait_timer; /* WAIT timer */ timer *hello_timer; /* HELLOINT timer */ timer *poll_timer; /* Poll Interval - for NBMA */ /* Default values for interface parameters */ #define COST_D 10 #define RXMTINT_D 5 #define INFTRANSDELAY_D 1 #define PRIORITY_D 1 #define HELLOINT_D 10 #define POLLINT_D 20 #define DEADC_D 4 #define WAIT_DMH 4 /* Value of Wait timer - not found it in RFC * - using 4*HELLO */ struct top_hash_entry *net_lsa; /* Originated network LSA */ int orignet; /* Schedule network LSA origination */ #ifdef OSPFv3 int origlink; /* Schedule link LSA origination */ struct top_hash_entry *link_lsa; /* Originated link LSA */ struct top_hash_entry *pxn_lsa; /* Originated prefix LSA */ #endif int fadj; /* Number of full adjacent neigh */ list nbma_list; u8 priority; /* A router priority for DR election */ u8 ioprob; #define OSPF_I_OK 0 /* Everything OK */ #define OSPF_I_SK 1 /* Socket open failed */ #define OSPF_I_LL 2 /* Missing link-local address (OSPFv3) */ u8 sk_dr; /* Socket is a member of DRouters group */ u8 marked; /* Used in OSPF reconfigure */ u16 rxbuf; /* Buffer size */ u8 check_link; /* Whether iface link change is used */ u8 ecmp_weight; /* Weight used for ECMP */ }; struct ospf_md5 { u16 zero; u8 keyid; u8 len; u32 csn; }; union ospf_auth { u8 password[8]; struct ospf_md5 md5; }; /* Packet types */ #define HELLO_P 1 /* Hello */ #define DBDES_P 2 /* Database description */ #define LSREQ_P 3 /* Link state request */ #define LSUPD_P 4 /* Link state update */ #define LSACK_P 5 /* Link state acknowledgement */ /* Area IDs */ #define BACKBONE 0 struct immsb { #ifdef CPU_BIG_ENDIAN u8 padding:5; u8 i:1; u8 m:1; u8 ms:1; #else u8 ms:1; u8 m:1; u8 i:1; u8 padding:5; #endif }; union imms { u8 byte; struct immsb bit; }; #define DBDES_MS 1 #define DBDES_M 2 #define DBDES_I 4 #ifdef OSPFv2 struct ospf_packet { u8 version; u8 type; u16 length; u32 routerid; u32 areaid; u16 checksum; u16 autype; union ospf_auth u; }; #else /* OSPFv3 packet descriptions */ struct ospf_packet { u8 version; u8 type; u16 length; u32 routerid; u32 areaid; u16 checksum; u8 instance_id; u8 zero; }; #endif struct ospf_lsa_header { u16 age; /* LS Age */ #define LSA_MAXAGE 3600 /* 1 hour */ #define LSA_CHECKAGE 300 /* 5 minutes */ #define LSA_MAXAGEDIFF 900 /* 15 minutes */ #ifdef OSPFv2 u8 options; u8 type; #define LSA_T_RT 1 #define LSA_T_NET 2 #define LSA_T_SUM_NET 3 #define LSA_T_SUM_RT 4 #define LSA_T_EXT 5 #define LSA_T_NSSA 7 #define LSA_SCOPE_AREA 0x2000 #define LSA_SCOPE_AS 0x4000 #define LSA_SCOPE(lsa) (((lsa)->type == LSA_T_EXT) ? LSA_SCOPE_AS : LSA_SCOPE_AREA) #else /* OSPFv3 */ u16 type; #define LSA_T_RT 0x2001 #define LSA_T_NET 0x2002 #define LSA_T_SUM_NET 0x2003 #define LSA_T_SUM_RT 0x2004 #define LSA_T_EXT 0x4005 #define LSA_T_NSSA 0x2007 #define LSA_T_LINK 0x0008 #define LSA_T_PREFIX 0x2009 #define LSA_UBIT 0x8000 #define LSA_SCOPE_LINK 0x0000 #define LSA_SCOPE_AREA 0x2000 #define LSA_SCOPE_AS 0x4000 #define LSA_SCOPE_RES 0x6000 #define LSA_SCOPE_MASK 0x6000 #define LSA_SCOPE(lsa) ((lsa)->type & LSA_SCOPE_MASK) #endif u32 id; u32 rt; /* Advertising router */ s32 sn; /* LS Sequence number */ #define LSA_INITSEQNO ((s32) 0x80000001) #define LSA_MAXSEQNO ((s32) 0x7fffffff) u16 checksum; u16 length; }; #define LSART_PTP 1 #define LSART_NET 2 #define LSART_STUB 3 #define LSART_VLNK 4 #ifdef OSPFv2 struct ospf_lsa_rt { #ifdef CPU_BIG_ENDIAN u16 options; /* VEB flags only */ u16 links; #else u16 links; u16 options; /* VEB flags only */ #endif }; struct ospf_lsa_rt_link { u32 id; u32 data; #ifdef CPU_BIG_ENDIAN u8 type; u8 padding; u16 metric; #else u16 metric; u8 padding; u8 type; #endif }; struct ospf_lsa_net { ip_addr netmask; u32 routers[]; }; struct ospf_lsa_sum { ip_addr netmask; u32 metric; }; struct ospf_lsa_ext { ip_addr netmask; u32 metric; ip_addr fwaddr; u32 tag; }; #define LSA_SUM_TOS 0xFF000000 #define LSA_EXT_TOS 0x7F000000 #define LSA_EXT_EBIT 0x80000000 /* Endianity swap for lsa->type */ #define ntoht(x) x #define htont(x) x #else /* OSPFv3 */ struct ospf_lsa_rt { u32 options; }; struct ospf_lsa_rt_link { #ifdef CPU_BIG_ENDIAN u8 type; u8 padding; u16 metric; #else u16 metric; u8 padding; u8 type; #endif u32 lif; /* Local interface ID */ u32 nif; /* Neighbor interface ID */ u32 id; /* Neighbor router ID */ }; struct ospf_lsa_net { u32 options; u32 routers[]; }; struct ospf_lsa_sum_net { u32 metric; u32 prefix[]; }; struct ospf_lsa_sum_rt { u32 options; u32 metric; u32 drid; }; struct ospf_lsa_ext { u32 metric; u32 rest[]; }; struct ospf_lsa_link { u32 options; ip_addr lladdr; u32 pxcount; u32 rest[]; }; struct ospf_lsa_prefix { #ifdef CPU_BIG_ENDIAN u16 pxcount; u16 ref_type; #else u16 ref_type; u16 pxcount; #endif u32 ref_id; u32 ref_rt; u32 rest[]; }; #define LSA_EXT_EBIT 0x4000000 #define LSA_EXT_FBIT 0x2000000 #define LSA_EXT_TBIT 0x1000000 /* Endianity swap for lsa->type */ #define ntoht(x) ntohs(x) #define htont(x) htons(x) #endif #define METRIC_MASK 0x00FFFFFF #define OPTIONS_MASK 0x00FFFFFF static inline unsigned lsa_rt_count(struct ospf_lsa_header *lsa) { return (lsa->length - sizeof(struct ospf_lsa_header) - sizeof(struct ospf_lsa_rt)) / sizeof(struct ospf_lsa_rt_link); } static inline unsigned lsa_net_count(struct ospf_lsa_header *lsa) { return (lsa->length - sizeof(struct ospf_lsa_header) - sizeof(struct ospf_lsa_net)) / sizeof(u32); } #ifdef OSPFv3 #define IPV6_PREFIX_SPACE(x) ((((x) + 63) / 32) * 4) #define IPV6_PREFIX_WORDS(x) (((x) + 63) / 32) static inline u32 * lsa_get_ipv6_prefix(u32 *buf, ip_addr *addr, int *pxlen, u8 *pxopts, u16 *rest) { u8 pxl = (*buf >> 24); *pxopts = (*buf >> 16); *rest = *buf; *pxlen = pxl; buf++; *addr = IPA_NONE; if (pxl > 0) _I0(*addr) = *buf++; if (pxl > 32) _I1(*addr) = *buf++; if (pxl > 64) _I2(*addr) = *buf++; if (pxl > 96) _I3(*addr) = *buf++; /* Clean up remaining bits */ if (pxl < 128) addr->addr[pxl / 32] &= u32_mkmask(pxl % 32); 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 /* Link down */ #define ISM_UNLOOP 5 /* Link up */ #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 */ 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 */ struct fib enet_fib; /* External networks for NSSAs */ u32 options; /* Optional features */ byte origrt; /* Rt lsa origination scheduled? */ byte trcap; /* Transit capability? */ byte marked; /* Used in OSPF reconfigure */ byte translate; /* Translator state (TRANS_*), for NSSA ABR */ timer *translator_timer; /* For NSSA translator switch */ struct proto_ospf *po; struct fib rtr; /* Routing tables for routers */ }; #define TRANS_OFF 0 #define TRANS_ON 1 #define TRANS_WAIT 2 /* Waiting before the end of translation */ 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 */ list iface_list; /* Interfaces we really use */ list area_list; int areano; /* Number of area I belong to */ struct fib rtf; /* Routing table */ byte rfc1583; /* RFC1583 compatibility */ byte ebit; /* Did I originate any ext lsa? */ byte ecmp; /* Maximal number of nexthops in ECMP route, or 0 */ struct ospf_area *backbone; /* If exists */ void *lsab; /* LSA buffer used when originating router LSAs */ int lsab_size, lsab_used; linpool *nhpool; /* Linpool used for next hops computed in SPF */ u32 router_id; }; struct ospf_iface_patt { struct iface_patt i; u32 type; u32 stub; u32 cost; u32 helloint; u32 rxmtint; u32 pollint; u32 waitint; u32 deadc; u32 deadint; u32 inftransdelay; u32 priority; u32 strictnbma; list nbma_list; u32 voa; u32 vid; u16 rxbuf; u8 check_link; u8 ecmp_weight; #define OSPF_RXBUF_NORMAL 0 #define OSPF_RXBUF_LARGE 1 #define OSPF_RXBUF_MINSIZE 256 /* Minimal allowed size */ 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); struct ospf_area *ospf_find_area(struct proto_ospf *po, u32 aid); static inline struct ospf_area *ospf_main_area(struct proto_ospf *po) { return (po->areano == 1) ? HEAD(po->area_list) : po->backbone; } static inline int oa_is_stub(struct ospf_area *oa) { return (oa->options & (OPT_E | OPT_N)) == 0; } static inline int oa_is_ext(struct ospf_area *oa) { return oa->options & OPT_E; } static inline int oa_is_nssa(struct ospf_area *oa) { return oa->options & OPT_N; } #ifdef OSPFv3 void schedule_link_lsa(struct ospf_iface *ifa); #else static inline void schedule_link_lsa(struct ospf_iface *ifa UNUSED) {} #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, int reachable); void ospf_sh_lsadb(struct proto *p); #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) #define EA_OSPF_ROUTER_ID EA_CODE(EAP_OSPF, 3) #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_ */