/* * BIRD -- OSPF * * (c) 1999--2005 Ondrej Filip * (c) 2009--2014 Ondrej Zajicek * (c) 2009--2014 CZ.NIC z.s.p.o. * * Can be freely distributed and used under the terms of the GNU GPL. */ #ifndef _BIRD_OSPF_H_ #define _BIRD_OSPF_H_ #include "nest/bird.h" #include "lib/checksum.h" #include "lib/idm.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/rt.h" #include "nest/cli.h" #include "nest/locks.h" #include "nest/bfd.h" #include "conf/conf.h" #include "lib/string.h" #ifdef LOCAL_DEBUG #define OSPF_FORCE_DEBUG 1 #else #define OSPF_FORCE_DEBUG 0 #endif #define OSPF_TRACE(flags, msg, args...) \ do { if ((p->p.debug & flags) || OSPF_FORCE_DEBUG) \ log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0) #define OSPF_PACKET(dumpfn, buffer, msg, args...) \ do { if ((p->p.debug & D_PACKETS) || OSPF_FORCE_DEBUG) \ { log(L_TRACE "%s: " msg, p->p.name, ## args ); dumpfn(p, buffer); } } while(0) #define LOG_PKT(msg, args...) \ log_rl(&p->log_pkt_tbf, L_REMOTE "%s: " msg, p->p.name, args) #define LOG_PKT_AUTH(msg, args...) \ log_rl(&p->log_pkt_tbf, L_AUTH "%s: " msg, p->p.name, args) #define LOG_PKT_WARN(msg, args...) \ log_rl(&p->log_pkt_tbf, L_WARN "%s: " msg, p->p.name, args) #define LOG_LSA1(msg, args...) \ log_rl(&p->log_lsa_tbf, L_REMOTE "%s: " msg, p->p.name, args) #define LOG_LSA2(msg, args...) \ do { if (! p->log_lsa_tbf.drop) \ log(L_REMOTE "%s: " msg, p->p.name, args); } while(0) #define OSPF_PROTO 89 #define LSREFRESHTIME 1800 /* 30 minutes */ #define MINLSINTERVAL (5 S_) #define MINLSARRIVAL (1 S_) #define LSINFINITY 0xffffff #define OSPF_PKT_TYPES 5 /* HELLO_P .. LSACK_P */ #define OSPF3_CRYPTO_ID 1 /* OSPFv3 Cryptographic Protocol ID */ #define OSPF_DEFAULT_TICK 1 #define OSPF_DEFAULT_STUB_COST 1000 #define OSPF_DEFAULT_ECMP_LIMIT 16 #define OSPF_DEFAULT_GR_TIME 120 #define OSPF_DEFAULT_TRANSINT 40 #define OSPF_MIN_PKT_SIZE 256 #define OSPF_MAX_PKT_SIZE 65535 #define OSPF_VLINK_ID_OFFSET 0x80000000 #define OSPF_GR_ABLE 1 #define OSPF_GR_AWARE 2 struct ospf_config { struct proto_config c; uint tick; u8 ospf2; u8 af_ext; u8 af_mc; u8 rfc1583; u8 stub_router; u8 merge_external; u8 instance_id; u8 instance_id_set; u8 abr; u8 asbr; u8 vpn_pe; u8 gr_mode; /* Graceful restart mode (OSPF_GR_*) */ uint gr_time; /* Graceful restart interval */ uint ecmp; list area_list; /* list of area configs (struct ospf_area_config) */ list vlink_list; /* list of configured vlinks (struct ospf_iface_patt) */ }; struct ospf_area_config { node n; u32 areaid; u32 default_cost; /* Cost of default route for stub areas (With possible LSA_EXT3_EBIT for NSSA 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 of iface configs (struct ospf_iface_patt) */ 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 */ }; struct area_net_config { node n; net_addr prefix; u32 tag; u8 hidden; }; struct area_net { u32 metric; /* With possible LSA_EXT3_EBIT for NSSA area nets */ u32 tag; u8 hidden; u8 active; struct fib_node fn; }; struct ospf_stubnet_config { node n; net_addr prefix; u32 cost; u8 hidden; u8 summary; }; struct nbma_node { node n; ip_addr ip; byte eligible; byte found; }; 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; list nbma_list; u32 priority; u32 voa; u32 vid; int tx_tos; int tx_priority; u16 tx_length; u16 rx_buffer; #define OSPF_RXBUF_MINSIZE 256 /* Minimal allowed size */ u8 instance_id; u8 instance_id_set; u8 autype; /* OSPF_AUTH_*, not really used in OSPFv3 */ u8 strictnbma; u8 check_link; u8 ecmp_weight; u8 link_lsa_suppression; u8 real_bcast; /* Not really used in OSPFv3 */ u8 ptp_netmask; /* bool + 2 for unspecified */ u8 ptp_address; /* bool + 2 for unspecified */ u8 ttl_security; /* bool + 2 for TX only */ u8 bfd; list *passwords; }; /* 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 ospf_proto { struct proto p; timer *disp_timer; /* OSPF proto dispatcher */ uint 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; /* List of OSPF interfaces (struct ospf_iface) */ list area_list; /* List of OSPF areas (struct ospf_area) */ int areano; /* Number of area I belong to */ int padj; /* Number of neighbors in Exchange or Loading state */ int gr_count; /* Number of neighbors in graceful restart state */ u8 gr_recovery; /* Graceful restart recovery is active */ u8 gr_cleanup; /* GR cleanup scheduled */ btime gr_timeout; /* The end time of grace restart recovery */ struct fib rtf; /* Routing table */ struct idm idm; /* OSPFv3 LSA ID map */ u8 ospf2; /* OSPF v2 or v3 */ u8 af_ext; /* OSPFv3-AF extension */ u8 af_mc; /* OSPFv3-AF multicast */ u8 rfc1583; /* RFC1583 compatibility */ u8 stub_router; /* Do not forward transit traffic */ u8 merge_external; /* Should i merge external routes? */ u8 instance_id; /* Differentiate between more OSPF instances */ u8 asbr; /* May i originate any ext/NSSA lsa? */ u8 vpn_pe; /* Should we do VPN PE specific behavior (RFC 4577)? */ u8 ecmp; /* Maximal number of nexthops in ECMP route, or 0 */ u8 gr_mode; /* Graceful restart mode (OSPF_GR_*) */ uint gr_time; /* Graceful restart interval */ u64 csn64; /* Last used cryptographic sequence number */ struct ospf_area *backbone; /* If exists */ event *flood_event; /* Event for flooding LS updates */ void *lsab; /* LSA buffer used when originating router LSAs */ int lsab_size, lsab_used; linpool *nhpool; /* Linpool used for next hops computed in SPF */ sock *vlink_sk; /* IP socket used for vlink TX */ u32 router_id; u32 last_vlink_id; /* Interface IDs for vlinks (starts at 0x80000000) */ struct tbf log_pkt_tbf; /* TBF for packet messages */ struct tbf log_lsa_tbf; /* TBF for LSA messages */ }; 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 */ u8 update_rt_lsa; /* Rt lsa origination scheduled? */ u8 trcap; /* Transit capability? */ u8 marked; /* Used in OSPF reconfigure */ u8 translate; /* Translator state (TRANS_*), for NSSA ABR */ timer *translator_timer; /* For NSSA translator switch */ struct ospf_proto *po; struct fib rtr; /* Routing tables for routers */ }; struct ospf_iface { node n; struct iface *iface; /* Nest's iface (NULL for vlinks) */ struct ifa *addr; /* IP prefix associated with that OSPF iface */ struct ospf_area *oa; struct ospf_iface_patt *cf; char *ifname; /* Interface name (iface->name), new one for vlinks */ pool *pool; sock *sk; /* IP socket */ list neigh_list; /* List of neighbors (struct ospf_neighbor) */ u32 cost; /* Cost of iface */ u32 waitint; /* Number of seconds before changing state from wait */ u32 rxmtint; /* Number of seconds between LSA retransmissions */ u32 pollint; /* Poll interval in seconds */ u32 deadint; /* After deadint seconds without hellos is router dead */ u32 iface_id; /* Interface ID (iface->index or new value for vlinks) */ 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 */ list *passwords; u32 csn; /* Last used crypt seq number */ btime csn_use; /* Last time when packet with that CSN was sent */ ip_addr all_routers; /* Multicast (or broadcast) address for all routers */ ip_addr des_routers; /* Multicast (or NULL) address for designated routers */ ip_addr drip; /* Designated router IP */ ip_addr bdrip; /* Backup DR IP */ u32 drid; /* DR Router ID */ u32 bdrid; /* BDR Router ID */ s16 rt_pos_beg; /* Position of iface in Router-LSA, begin, inclusive */ s16 rt_pos_end; /* Position of iface in Router-LSA, end, exclusive */ 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 */ u8 autype; /* Authentication type (OSPF_AUTH_*) */ u8 type; /* OSPF view of type (OSPF_IT_*) */ u8 strictnbma; /* Can I talk with unknown neighbors? */ u8 stub; /* Inactive interface */ u8 state; /* Interface state machine (OSPF_IS_*) */ timer *wait_timer; /* WAIT timer */ timer *hello_timer; /* HELLOINT timer */ timer *poll_timer; /* Poll Interval - for NBMA */ struct top_hash_entry *link_lsa; /* Originated link LSA */ struct top_hash_entry *net_lsa; /* Originated network LSA */ struct top_hash_entry *pxn_lsa; /* Originated prefix LSA */ struct top_hash_entry **flood_queue; /* LSAs queued for LSUPD */ u8 update_link_lsa; u8 update_net_lsa; u16 flood_queue_used; /* The current number of LSAs in flood_queue */ u16 flood_queue_size; /* The maximum number of LSAs in flood_queue */ int fadj; /* Number of fully adjacent neighbors */ 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 designated routers group */ u8 marked; /* Used in OSPF reconfigure, 2 for force restart */ u16 rxbuf; /* Buffer size */ u16 tx_length; /* Soft TX packet length limit, usually MTU */ u16 tx_hdrlen; /* Expected packet header length, less than tx_length */ u8 check_link; /* Whether iface link change is used */ u8 ecmp_weight; /* Weight used for ECMP */ u8 link_lsa_suppression; /* Suppression of Link-LSA origination */ u8 ptp_netmask; /* Send real netmask for P2P */ u8 ptp_address; /* Send IP address in data field for PtP */ u8 check_ttl; /* Check incoming packets for TTL 255 */ u8 bfd; /* Use BFD on iface */ }; struct ospf_neighbor { node n; pool *pool; struct ospf_iface *ifa; u8 state; u8 gr_active; /* We act as GR helper for the neighbor */ u8 got_my_rt_lsa; /* Received my Rt-LSA in DBDES exchanged */ timer *inactim; /* Inactivity timer */ u8 imms; /* I, M, Master/slave received */ u8 myimms; /* I, M Master/slave */ u32 dds; /* DD Sequence number being sent */ u32 ddr; /* last Dat Des packet received */ u32 rid; /* Router ID */ ip_addr ip; /* IP of it's interface */ u8 priority; /* Priority */ u32 options; /* Options received */ /* Entries dr and bdr store IP addresses in OSPFv2 and router IDs in OSPFv3, we use the same type to simplify handling */ u32 dr; /* Neighbor's idea of DR */ u32 bdr; /* Neighbor's idea of BDR */ u32 iface_id; /* ID of Neighbour's iface connected to common network */ /* Database summary list iterator, controls initial dbdes exchange. * Advances in the LSA list as dbdes packets are sent. */ siterator dbsi; /* iterator of po->lsal */ /* Link state request list, controls initial LSA exchange. * Entries added when received in dbdes packets, removed as sent in lsreq packets. */ slist lsrql; /* slist of struct top_hash_entry from n->lsrqh */ struct top_graph *lsrqh; struct top_hash_entry *lsrqi; /* Pointer to the first unsent node in lsrql */ /* Link state retransmission list, controls LSA retransmission during flood. * Entries added as sent in lsupd packets, removed when received in lsack packets. * These entries hold ret_count in appropriate LSA entries. */ slist lsrtl; /* slist of struct top_hash_entry from n->lsrth */ struct top_graph *lsrth; timer *dbdes_timer; /* DBDES exchange timer */ timer *lsrq_timer; /* LSA request timer */ timer *lsrt_timer; /* LSA retransmission timer */ list ackl[2]; #define ACKL_DIRECT 0 #define ACKL_DELAY 1 timer *ackd_timer; /* Delayed ack timer */ timer *gr_timer; /* Graceful restart timer, non-NULL only if gr_active */ struct bfd_request *bfd_req; /* BFD request, if BFD is used */ void *ldd_buffer; /* Last database description packet */ u32 ldd_bsize; /* Buffer size for ldd_buffer */ u32 csn; /* OSPFv2: Last received crypt seq number */ u64 csn64[OSPF_PKT_TYPES]; /* OSPFv3: Last received CSN for each type of packet */ }; /* OSPF interface types */ #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 /* OSPF interface states */ #define OSPF_IS_DOWN 0 /* Not active */ #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 */ /* 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 */ /* OSPF authentication types */ #define OSPF_AUTH_NONE 0 #define OSPF_AUTH_SIMPLE 1 #define OSPF_AUTH_CRYPT 2 #define OSPF3_AUTH_HMAC 1 /* HMAC Cryptographic Authentication */ /* OSPF neighbor states */ #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 /* 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 */ #define TRANS_OFF 0 #define TRANS_ON 1 #define TRANS_WAIT 2 /* Waiting before the end of translation */ /* Generic option flags */ #define OPT_V6 0x0001 /* OSPFv3, LSA relevant for IPv6 routing calculation */ #define OPT_E 0x0002 /* Related to AS-external LSAs */ #define OPT_MC 0x0004 /* Related to MOSPF, not used and obsolete */ #define OPT_N 0x0008 /* Related to NSSA */ #define OPT_P 0x0008 /* OSPFv2, flags P and N share position, see NSSA RFC */ #define OPT_L_V2 0x0010 /* OSPFv2, link-local signaling, not used */ #define OPT_R 0x0010 /* OSPFv3, originator is active router */ #define OPT_DC 0x0020 /* Related to demand circuits, not used */ #define OPT_O 0x0040 /* OSPFv2 Opaque LSA (RFC 5250) */ #define OPT_DN 0x0080 /* OSPFv2 VPN loop prevention (RFC 4576) */ #define OPT_AF 0x0100 /* OSPFv3 Address Families (RFC 5838) */ #define OPT_L_V3 0x0200 /* OSPFv3, link-local signaling */ #define OPT_AT 0x0400 /* OSPFv3, authentication trailer */ #define HELLO2_OPT_MASK (OPT_E | OPT_N | OPT_L_V2) #define DBDES2_OPT_MASK (OPT_E | OPT_L_V2 | OPT_O) #define HELLO3_OPT_MASK (OPT_V6 | OPT_E | OPT_N | OPT_R | OPT_AF | OPT_L_V3 | OPT_AT ) #define DBDES3_OPT_MASK (OPT_V6 | OPT_E | OPT_R | OPT_AF | OPT_L_V3 | OPT_AT ) /* Router-LSA VEB flags are are stored together with links (OSPFv2) or options (OSPFv3) */ #define OPT_RT_B (0x01 << 24) #define OPT_RT_E (0x02 << 24) #define OPT_RT_V (0x04 << 24) #define OPT_RT_NT (0x10 << 24) /* Prefix flags, specific for OSPFv3 */ #define OPT_PX_NU 0x01 #define OPT_PX_LA 0x02 #define OPT_PX_P 0x08 #define OPT_PX_DN 0x10 struct ospf_packet { u8 version; u8 type; u16 length; u32 routerid; u32 areaid; u16 checksum; u8 instance_id; /* See RFC 6549 */ u8 autype; /* Undefined for OSPFv3 */ }; struct ospf_lls { u16 checksum; u16 length; byte data[0]; }; struct ospf_auth_crypto { u16 zero; u8 keyid; u8 len; u32 csn; /* Cryptographic sequence number (32-bit) */ }; union ospf_auth2 { u8 password[8]; struct ospf_auth_crypto c32; }; struct ospf_auth3 { u16 type; /* Authentication type (OSPF3_AUTH_*) */ u16 length; /* Authentication trailer length (header + data) */ u16 reserved; u16 sa_id; /* Security association identifier (key_id) */ u64 csn; /* Cryptographic sequence number (64-bit) */ byte data[0]; /* Authentication data */ }; /* 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 */ #define DBDES_I 4 /* Init bit */ #define DBDES_M 2 /* More bit */ #define DBDES_MS 1 /* Master/Slave bit */ #define DBDES_IMMS (DBDES_I | DBDES_M | DBDES_MS) /* OSPFv3 LSA Types / LSA Function Codes */ /* https://www.iana.org/assignments/ospfv3-parameters/ospfv3-parameters.xhtml#ospfv3-parameters-3 */ #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_T_GR 0x000B #define LSA_T_RI_ 0x000C #define LSA_T_RI_LINK 0x800C #define LSA_T_RI_AREA 0xA00C #define LSA_T_RI_AS 0xC00C #define LSA_T_OPAQUE_ 0x1FFF #define LSA_T_OPAQUE_LINK 0x9FFF #define LSA_T_OPAQUE_AREA 0xBFFF #define LSA_T_OPAQUE_AS 0xDFFF #define LSA_T_V2_OPAQUE_ 0x0009 #define LSA_T_V2_MASK 0x00ff /* OSPFv2 Opaque LSA Types */ /* https://www.iana.org/assignments/ospf-opaque-types/ospf-opaque-types.xhtml#ospf-opaque-types-2 */ #define LSA_OT_GR 0x03 #define LSA_OT_RI 0x04 #define LSA_FUNCTION_MASK 0x1FFF #define LSA_FUNCTION(type) ((type) & LSA_FUNCTION_MASK) #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(type) ((type) & LSA_SCOPE_MASK) #define LSA_SCOPE_ORDER(type) (((type) >> 13) & 0x3) #define LSA_MAXAGE 3600 /* 1 hour */ #define LSA_CHECKAGE 300 /* 5 minutes */ #define LSA_MAXAGEDIFF 900 /* 15 minutes */ #define LSA_ZEROSEQNO ((s32) 0x80000000) #define LSA_INITSEQNO ((s32) 0x80000001) #define LSA_MAXSEQNO ((s32) 0x7fffffff) #define LSA_METRIC_MASK 0x00FFFFFF #define LSA_OPTIONS_MASK 0x00FFFFFF #define LSART_PTP 1 #define LSART_NET 2 #define LSART_STUB 3 #define LSART_VLNK 4 #define LSA_RT2_LINKS 0x0000FFFF #define LSA_SUM2_TOS 0xFF000000 #define LSA_EXT2_TOS 0x7F000000 #define LSA_EXT2_EBIT 0x80000000 #define LSA_EXT3_EBIT 0x04000000 #define LSA_EXT3_FBIT 0x02000000 #define LSA_EXT3_TBIT 0x01000000 /* OSPF Grace LSA (GR) TLVs */ /* https://www.iana.org/assignments/ospfv2-parameters/ospfv2-parameters.xhtml#ospfv2-parameters-13 */ #define LSA_GR_PERIOD 1 #define LSA_GR_REASON 2 #define LSA_GR_ADDRESS 3 /* OSPF Router Information (RI) TLVs */ /* https://www.iana.org/assignments/ospf-parameters/ospf-parameters.xhtml#ri-tlv */ #define LSA_RI_RIC 1 #define LSA_RI_RFC 2 /* OSPF Router Informational Capability Bits */ /* https://www.iana.org/assignments/ospf-parameters/ospf-parameters.xhtml#router-informational-capability */ #define LSA_RIC_GR_CAPABLE 0 #define LSA_RIC_GR_HELPER 1 #define LSA_RIC_STUB_ROUTER 2 struct ospf_lsa_header { u16 age; /* LS Age */ u16 type_raw; /* Type, mixed with options on OSPFv2 */ u32 id; u32 rt; /* Advertising router */ s32 sn; /* LS Sequence number */ u16 checksum; u16 length; }; /* In OSPFv2, options are embedded in higher half of type_raw */ static inline u8 lsa_get_options(struct ospf_lsa_header *lsa) { return lsa->type_raw >> 8; } static inline void lsa_set_options(struct ospf_lsa_header *lsa, u16 options) { lsa->type_raw = (lsa->type_raw & 0xff) | (options << 8); } struct ospf_lsa_rt { u32 options; /* VEB flags, mixed with link count for OSPFv2 and options for OSPFv3 */ }; struct ospf_lsa_rt2_link { u32 id; u32 data; #ifdef CPU_BIG_ENDIAN u8 type; u8 no_tos; u16 metric; #else u16 metric; u8 no_tos; u8 type; #endif }; struct ospf_lsa_rt2_tos { #ifdef CPU_BIG_ENDIAN u8 tos; u8 padding; u16 metric; #else u16 metric; u8 padding; u8 tos; #endif }; struct ospf_lsa_rt3_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 optx; /* Netmask for OSPFv2, options for OSPFv3 */ u32 routers[]; }; struct ospf_lsa_sum2 { u32 netmask; u32 metric; }; struct ospf_lsa_sum3_net { u32 metric; u32 prefix[]; }; struct ospf_lsa_sum3_rt { u32 options; u32 metric; u32 drid; }; struct ospf_lsa_ext2 { u32 netmask; u32 metric; u32 fwaddr; u32 tag; }; struct ospf_lsa_ext3 { u32 metric; u32 rest[]; }; struct ospf_lsa_ext_local { net_addr net; ip_addr fwaddr; u32 metric, ebit, fbit, tag, propagate, downwards; u8 pxopts; }; struct ospf_lsa_link { u32 options; ip6_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[]; }; struct ospf_tlv { #ifdef CPU_BIG_ENDIAN u16 type; u16 length; #else u16 length; u16 type; #endif u32 data[]; }; static inline uint lsa_net_count(struct ospf_lsa_header *lsa) { return (lsa->length - sizeof(struct ospf_lsa_header) - sizeof(struct ospf_lsa_net)) / sizeof(u32); } /* In ospf_area->rtr we store paths to routers, but we use RID (and not IP address) as index, so we need to encapsulate RID to IP address */ #define net_from_rid(x) NET_ADDR_IP4(ip4_from_u32(x), IP4_MAX_PREFIX_LENGTH) #define rid_from_net(x) ip4_to_u32(((net_addr_ip4 *) x)->prefix) #define IPV6_PREFIX_SPACE(x) ((((x) + 63) / 32) * 4) #define IPV6_PREFIX_WORDS(x) (((x) + 63) / 32) static inline int ospf_valid_prefix(net_addr *n) { /* * In OSPFv2, prefix is stored as netmask; ip4_masklen() returns 255 for * invalid one. But OSPFv3-AF may receive IPv4 net with 32 < pxlen < 128. */ uint max = (n->type == NET_IP4) ? IP4_MAX_PREFIX_LENGTH : IP6_MAX_PREFIX_LENGTH; return n->pxlen <= max; } /* * In OSPFv3-AF (RFC 5835), IPv4 address is encoded by just placing it in the * first 32 bits of IPv6 address and setting remaining bits to zero. Likewise * for IPv4 prefix, where remaining bits do not matter. We use following * functions to convert between IPv4 and IPv4-in-IPv6 representations: */ static inline ip4_addr ospf3_6to4(ip6_addr a) { return _MI4(_I0(a)); } static inline ip6_addr ospf3_4to6(ip4_addr a) { return _MI6(_I(a), 0, 0, 0); } static inline u32 * ospf3_get_prefix(u32 *buf, int af, net_addr *n, u8 *pxopts, u16 *rest) { ip6_addr px = IP6_NONE; uint pxlen = (*buf >> 24); *pxopts = (*buf >> 16) & 0xff; if (rest) *rest = *buf & 0xffff; buf++; if (pxlen > 0) _I0(px) = *buf++; if (pxlen > 32) _I1(px) = *buf++; if (pxlen > 64) _I2(px) = *buf++; if (pxlen > 96) _I3(px) = *buf++; /* Clean up remaining bits */ if (pxlen < 128) px.addr[pxlen / 32] &= u32_mkmask(pxlen % 32); if (af == NET_IP4) net_fill_ip4(n, ospf3_6to4(px), pxlen); else net_fill_ip6(n, px, pxlen); return buf; } static inline u32 * ospf3_put_prefix(u32 *buf, net_addr *n, u8 pxopts, u16 rest) { ip6_addr px = (n->type == NET_IP4) ? ospf3_4to6(net4_prefix(n)) : net6_prefix(n); uint pxlen = n->pxlen; *buf++ = ((pxlen << 24) | (pxopts << 16) | rest); if (pxlen > 0) *buf++ = _I0(px); if (pxlen > 32) *buf++ = _I1(px); if (pxlen > 64) *buf++ = _I2(px); if (pxlen > 96) *buf++ = _I3(px); return buf; } static inline u32 * ospf3_get_addr(u32 *buf, int af, ip_addr *addr) { ip6_addr a; memcpy(&a, buf, 16); *addr = (af == NET_IP4) ? ipa_from_ip4(ospf3_6to4(a)) : ipa_from_ip6(a); return buf + 4; } static inline u32 * ospf3_put_addr(u32 *buf, ip_addr addr) { ip6_addr a = ipa_is_ip4(addr) ? ospf3_4to6(ipa_to_ip4(addr)) : ipa_to_ip6(addr); memcpy(buf, &a, 16); return buf + 4; } struct ospf_lsreq_header { u32 type; u32 id; u32 rt; }; #define SH_ROUTER_SELF 0xffffffff struct lsadb_show_data { struct ospf_proto *proto; /* Protocol to request data from */ u16 type; /* LSA Type, 0 -> all */ u16 scope; /* Scope, 0 -> all, hack to handle link scope as 1 */ u32 area; /* Specified for area scope */ u32 lsid; /* LSA ID, 0 -> all */ u32 router; /* Advertising router, 0 -> all */ }; #define EA_OSPF_METRIC1 EA_CODE(PROTOCOL_OSPF, 0) #define EA_OSPF_METRIC2 EA_CODE(PROTOCOL_OSPF, 1) #define EA_OSPF_TAG EA_CODE(PROTOCOL_OSPF, 2) #define EA_OSPF_ROUTER_ID EA_CODE(PROTOCOL_OSPF, 3) /* * For regular networks, neighbor address must match network prefix. * For unnumbered networks, we consider every address local. */ static inline int ospf_ipa_local(ip_addr a, const struct ifa *addr) { return ipa_in_netX(a, &addr->prefix) || (addr->flags & IA_HOST); } /* ospf.c */ void ospf_schedule_rtcalc(struct ospf_proto *p); static inline void ospf_notify_rt_lsa(struct ospf_area *oa) { oa->update_rt_lsa = 1; } static inline void ospf_notify_net_lsa(struct ospf_iface *ifa) { ifa->update_net_lsa = 1; } static inline void ospf_notify_link_lsa(struct ospf_iface *ifa) { ifa->update_link_lsa = 1; } static inline int ospf_is_v2(struct ospf_proto *p) { return p->ospf2; } static inline int ospf_is_v3(struct ospf_proto *p) { return ! p->ospf2; } static inline int ospf_get_version(struct ospf_proto *p) { return ospf_is_v2(p) ? 2 : 3; } static inline int ospf_is_ip4(struct ospf_proto *p) { return p->p.net_type == NET_IP4; } static inline int ospf_is_ip6(struct ospf_proto *p) { return p->p.net_type == NET_IP6; } static inline int ospf_get_af(struct ospf_proto *p) { return p->p.net_type; } struct ospf_area *ospf_find_area(struct ospf_proto *p, u32 aid); static inline struct ospf_area *ospf_main_area(struct ospf_proto *p) { return (p->areano == 1) ? HEAD(p->area_list) : p->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; } void ospf_stop_gr_recovery(struct ospf_proto *p); void ospf_sh_neigh(struct proto *P, const char *iff); void ospf_sh(struct proto *P); void ospf_sh_iface(struct proto *P, const char *iff); void ospf_sh_state(struct proto *P, int verbose, int reachable); void ospf_sh_lsadb(struct lsadb_show_data *ld); /* iface.c */ void ospf_iface_chstate(struct ospf_iface *ifa, u8 state); void ospf_iface_sm(struct ospf_iface *ifa, int event); struct ospf_iface *ospf_iface_find(struct ospf_proto *p, struct iface *what); void ospf_if_notify(struct proto *P, uint flags, struct iface *iface); void ospf_ifa_notify2(struct proto *P, uint flags, struct ifa *a); void ospf_ifa_notify3(struct proto *P, uint flags, struct ifa *a); void ospf_iface_info(struct ospf_iface *ifa); void ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *ip); void ospf_iface_new_vlink(struct ospf_proto *p, struct ospf_iface_patt *ip); void ospf_iface_remove(struct ospf_iface *ifa); void ospf_iface_shutdown(struct ospf_iface *ifa); int ospf_iface_assure_bufsize(struct ospf_iface *ifa, uint plen); int ospf_iface_reconfigure(struct ospf_iface *ifa, struct ospf_iface_patt *new); void ospf_reconfigure_ifaces(struct ospf_proto *p); void ospf_open_vlink_sk(struct ospf_proto *p); struct nbma_node *find_nbma_node_(list *nnl, ip_addr ip); static inline struct nbma_node * find_nbma_node(struct ospf_iface *ifa, ip_addr ip) { return find_nbma_node_(&ifa->nbma_list, ip); } static inline u32 ospf_iface_get_data(struct ospf_iface *ifa) { /* * Return expected value of the link data field in Rt-LSA for given iface. * It should be ifa->iface_id for unnumbered PtP links, IP address otherwise * (see RFC 2328 12.4.1.1). It is controlled by ifa->ptp_address field so it * can be overriden for compatibility purposes. */ return ((ifa->type == OSPF_IT_PTP) && !ifa->ptp_address) ? ifa->iface_id : ipa_to_u32(ifa->addr->ip); } /* neighbor.c */ struct ospf_neighbor *ospf_neighbor_new(struct ospf_iface *ifa); void ospf_neigh_sm(struct ospf_neighbor *n, int event); void ospf_neigh_cancel_graceful_restart(struct ospf_neighbor *n); void ospf_neigh_notify_grace_lsa(struct ospf_neighbor *n, struct top_hash_entry *en); void ospf_neigh_lsadb_changed_(struct ospf_proto *p, struct top_hash_entry *en); void ospf_dr_election(struct ospf_iface *ifa); struct ospf_neighbor *find_neigh(struct ospf_iface *ifa, u32 rid); struct ospf_neighbor *find_neigh_by_ip(struct ospf_iface *ifa, ip_addr ip); void ospf_neigh_update_bfd(struct ospf_neighbor *n, int use_bfd); void ospf_sh_neigh_info(struct ospf_neighbor *n); static inline void ospf_neigh_lsadb_changed(struct ospf_proto *p, struct top_hash_entry *en) { if (p->gr_count) ospf_neigh_lsadb_changed_(p, en); } /* packet.c */ void ospf_pkt_fill_hdr(struct ospf_iface *ifa, void *buf, u8 h_type); int ospf_rx_hook(sock * sk, uint size); // void ospf_tx_hook(sock * sk); void ospf_err_hook(sock * sk, int err); void ospf_verr_hook(sock *sk, int err); void ospf_send_to(struct ospf_iface *ifa, ip_addr ip); void ospf_send_to_iface(struct ospf_iface *ifa); static inline void ospf_send_to_nbr(struct ospf_iface *ifa, struct ospf_neighbor *n) { ospf_send_to(ifa, (ifa->type == OSPF_IT_PTP) ? ifa->all_routers : n->ip); } static inline void ospf_send_to_all(struct ospf_iface *ifa) { ospf_send_to(ifa, ifa->all_routers); } static inline uint ospf_pkt_maxsize(struct ospf_iface *ifa) { return ifa->tx_length - ifa->tx_hdrlen; } #ifndef PARSER #define DROP(DSC,VAL) do { err_dsc = DSC; err_val = VAL; goto drop; } while(0) #define DROP1(DSC) do { err_dsc = DSC; goto drop; } while(0) #define SKIP(DSC) do { err_dsc = DSC; goto skip; } while(0) #endif static inline uint ospf_pkt_hdrlen(struct ospf_proto *p) { return ospf_is_v2(p) ? (sizeof(struct ospf_packet) + sizeof(union ospf_auth2)) : sizeof(struct ospf_packet); } static inline void * ospf_tx_buffer(struct ospf_iface *ifa) { return ifa->sk->tbuf; } /* hello.c */ #define OHS_HELLO 0 #define OHS_POLL 1 #define OHS_SHUTDOWN 2 void ospf_send_hello(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn); void ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n, ip_addr faddr); uint ospf_hello3_options(struct ospf_packet *pkt); /* dbdes.c */ void ospf_send_dbdes(struct ospf_proto *p, struct ospf_neighbor *n); void ospf_rxmt_dbdes(struct ospf_proto *p, struct ospf_neighbor *n); void ospf_reset_ldd(struct ospf_proto *p, struct ospf_neighbor *n); void ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n); uint ospf_dbdes3_options(struct ospf_packet *pkt); /* lsreq.c */ void ospf_send_lsreq(struct ospf_proto *p, struct ospf_neighbor *n); void ospf_receive_lsreq(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n); /* lsupd.c */ void ospf_dump_lsahdr(struct ospf_proto *p, struct ospf_lsa_header *lsa_n); void ospf_dump_common(struct ospf_proto *p, struct ospf_packet *pkt); void ospf_lsa_lsrt_down_(struct top_hash_entry *en, struct ospf_neighbor *n, struct top_hash_entry *ret); void ospf_add_flushed_to_lsrt(struct ospf_proto *p, struct ospf_neighbor *n); void ospf_flood_event(void *ptr); int ospf_flood_lsa(struct ospf_proto *p, struct top_hash_entry *en, struct ospf_neighbor *from); int ospf_send_lsupd(struct ospf_proto *p, struct top_hash_entry **lsa_list, uint lsa_count, struct ospf_neighbor *n); void ospf_rxmt_lsupd(struct ospf_proto *p, struct ospf_neighbor *n); void ospf_receive_lsupd(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n); /* lsack.c */ void ospf_enqueue_lsack(struct ospf_neighbor *n, struct ospf_lsa_header *h_n, int queue); void ospf_reset_lsack_queue(struct ospf_neighbor *n); void ospf_send_lsack(struct ospf_proto *p, struct ospf_neighbor *n, int queue); void ospf_receive_lsack(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n); #include "proto/ospf/rt.h" #include "proto/ospf/topology.h" #include "proto/ospf/lsalib.h" #endif /* _BIRD_OSPF_H_ */