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Multipath support for OSPF

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This commit is contained in:
Ondrej Zajicek
2010-12-07 23:35:39 +01:00
parent 9852f81064
commit 57c574d82a
8 changed files with 443 additions and 234 deletions
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33
proto/ospf/rt.h
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@@ -40,21 +40,32 @@ typedef struct orta
u32 tag;
u32 rid; /* Router ID of real advertising router */
struct ospf_area *oa;
struct ospf_iface *ifa; /* Outgoing interface */
ip_addr nh; /* Next hop */
struct ospf_area *voa; /* Used when route is replaced in ospf_rt_sum_tr(),
NULL otherwise */
struct mpnh *nhs; /* Next hops computed during SPF */
}
orta;
// struct ospf_iface *ifa; /* Outgoing interface */
// ip_addr nh; /* Next hop */
typedef struct ort
{
/*
* We use fn.x0 to mark persistent rt entries, that are needed for summary
* LSAs that don't have 'proper' rt entry (area networks + default to stubs)
* to keep uid stable (used for LSA ID in OSPFv3 - see fibnode_to_lsaid()).
*
* old_* values are here to represent the last route update. old_rta
* is cached (we keep reference), mainly for multipath nexthops.
* old_rta == NULL means route wasn not in the last update, in that
* case other old_* values are not valid.
*/
struct fib_node fn;
orta n;
orta o;
u32 old_metric1, old_metric2, old_tag, old_rid;
rta *old_rta;
}
ort;
@@ -64,18 +75,24 @@ ort;
* - only router, network and AS-external LSAs
* - lsa.age < LSA_MAXAGE
* - dist < LSINFINITY (or 2*LSINFINITY for ext-LSAs)
* - nhi are non-NULL unless the node is oa->rt (calculating router itself)
* - beware, nhi is not valid after SPF calculation
* - nh is IFA_NONE iff the node is a local network
* - nhs is non-NULL unless the node is oa->rt (calculating router itself)
* - beware, nhs is not valid after SPF calculation
*
* Invariants for structs orta nodes of fib tables po->rtf, oa->rtr:
* - nodes may be invalid (fn.type == 0), in that case other invariants don't hold
* - n.metric1 may be at most a small multiple of LSINFINITY,
* therefore sums do not overflow
* - n.oa is always non-NULL
* - n.ifa is always non-NULL with one exception - configured stubnet
nodes (in po->rtf). In that case, n.nh is IFA_NONE.
* - n.nhs is always non-NULL with one exception - configured stubnet
* nodes (in po->rtf).
* - oa->rtr does not contain calculating router itself
*
* There are three types of nexthops in nhs fields:
* - gateway nexthops (non-NULL iface, gw != IPA_NONE)
* - device nexthops (non-NULL iface, gw == IPA_NONE)
* - dummy vlink nexthops (NULL iface, gw == IPA_NONE)
* These three types don't mix, nhs field contains either
* one device, one vlink node, or one/more gateway nodes.
*/
void ospf_rt_spf(struct proto_ospf *po);