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84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*
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* BIRD -- OSPF
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*
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* (c) 2000--2004 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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*/
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#ifndef _BIRD_OSPF_RT_H_
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#define _BIRD_OSPF_RT_H_
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#define ORT_UNDEF -1
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#define ORT_ROUTER 1
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#define ORT_NET 0
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typedef struct orta
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{
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int type;
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u32 options;
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/*
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* For ORT_ROUTER routes, options field are router-LSA style
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* options, with V,E,B bits. In OSPFv2, ASBRs from another areas
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* (that we know from rt-summary-lsa) have just ORTA_ASBR in
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* options, their real options are unknown.
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*/
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#define ORTA_ASBR OPT_RT_E
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#define ORTA_ABR OPT_RT_B
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/*
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* For ORT_NET routes, the field is almost unused with one
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* exception: ORTA_PREF for external routes means that the route is
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* preferred in AS external route selection according to 16.4.1. -
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* it is intra-area path using non-backbone area. In other words,
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* the forwarding address (or ASBR if forwarding address is zero) is
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* intra-area (type == RTS_OSPF) and its area is not a backbone.
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*/
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#define ORTA_PREF 0x80000000
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u32 metric1;
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u32 metric2;
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u32 tag;
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u32 rid; /* Router ID of real advertising router */
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struct ospf_area *oa;
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struct ospf_iface *ifa; /* Outgoing interface */
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ip_addr nh; /* Next hop */
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}
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orta;
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typedef struct ort
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{
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/*
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* We use fn.x0 to mark persistent rt entries, that are needed for summary
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* LSAs that don't have 'proper' rt entry (area networks + default to stubs)
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* to keep uid stable (used for LSA ID in OSPFv3 - see fibnode_to_lsaid()).
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*/
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struct fib_node fn;
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orta n;
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orta o;
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}
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ort;
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/*
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* Invariants for structs top_hash_entry (nodes of LSA db)
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* enforced by SPF calculation for final nodes (color == INSPF):
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* - only router, network and AS-external LSAs
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* - lsa.age < LSA_MAXAGE
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* - dist < LSINFINITY (or 2*LSINFINITY for ext-LSAs)
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* - nhi are non-NULL unless the node is oa->rt (calculating router itself)
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* - beware, nhi is not valid after SPF calculation
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* - nh is IFA_NONE iff the node is a local network
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*
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* Invariants for structs orta nodes of fib tables po->rtf, oa->rtr:
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* - nodes may be invalid (fn.type == 0), in that case other invariants don't hold
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* - n.metric1 may be at most a small multiple of LSINFINITY,
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* therefore sums do not overflow
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* - n.oa and n.ifa are always non-NULL
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* - oa->rtr does not contain calculating router itself
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*/
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void ospf_rt_spf(struct proto_ospf *po);
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void ospf_rt_initort(struct fib_node *fn);
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#endif /* _BIRD_OSPF_RT_H_ */
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