129 lines
4.3 KiB
C
129 lines
4.3 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_NET 0
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#define ORT_ROUTER 1
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typedef struct orta
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{
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u8 type; /* RTS_OSPF_* */
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u8 nhs_reuse; /* Whether nhs nodes can be reused during merging */
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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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#define ORTA_NSSA 0x40000000
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#define ORTA_PROP 0x20000000
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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_area *voa; /* Used when route is replaced in ospf_rt_sum_tr(),
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NULL otherwise */
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struct mpnh *nhs; /* Next hops computed during SPF */
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struct top_hash_entry *en; /* LSA responsible for this orta */
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}
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orta;
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/* Values for fn.flags in struct ort */
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#define OSPF_RT_PERSISTENT 0x01
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typedef struct ort
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{
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/*
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* We use OSPF_RT_PERSISTENT to mark persistent rt entries, that are
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* needed for summary LSAs that don't have 'proper' rt entry (area
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* networks + default to stubs) to keep uid stable (used for LSA ID
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* in OSPFv3 - see fibnode_to_lsaid()).
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*
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* We use ORT_RT_EXPORT and ORT_RT_NSSA to note whether the
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* external/NSSA route was originated from the route export (in
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* ospf_rt_notify()) or from the NSSA route translation (in
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* check_nssa_lsa()).
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*
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* old_* values are here to represent the last route update. old_rta
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* is cached (we keep reference), mainly for multipath nexthops.
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* old_rta == NULL means route was not in the last update, in that
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* case other old_* values are not valid.
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*/
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struct fib_node fn;
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orta n;
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u32 old_metric1, old_metric2, old_tag, old_rid;
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rta *old_rta;
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u8 external_rte;
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}
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ort;
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static inline int rt_is_nssa(ort *nf)
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{ return nf->n.options & ORTA_NSSA; }
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#define EXT_EXPORT 1
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#define EXT_NSSA 2
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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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* - nhs is non-NULL unless the node is oa->rt (calculating router itself)
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* - beware, nhs is not valid after SPF calculation
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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 is always non-NULL
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* - n.nhs is always non-NULL unless it is configured stubnet
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* - n.en is non-NULL for external routes, NULL for intra/inter area routes.
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* - oa->rtr does not contain calculating router itself
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*
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* There are four types of nexthops in nhs fields:
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* - gateway nexthops (non-NULL iface, gw != IPA_NONE)
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* - device nexthops (non-NULL iface, gw == IPA_NONE)
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* - dummy vlink nexthops (NULL iface, gw == IPA_NONE)
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* - configured stubnets (nhs is NULL, only RTS_OSPF orta nodes in po->rtf)
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*
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* Dummy vlink nexthops and configured stubnets cannot be mixed with
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* regular ones, nhs field contains either list of gateway+device nodes,
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* one vlink node, or NULL for configured stubnet.
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*
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* Dummy vlink nexthops can appear in both network (rtf) and backbone area router
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* (rtr) tables for regular and inter-area routes, but only if areano > 1. They are
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* replaced in ospf_rt_sum_tr() and removed in ospf_rt_abr1(), therefore cannot
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* appear in ASBR pre-selection and external routes processing.
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*/
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void ospf_rt_spf(struct ospf_proto *p);
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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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