diff options
Diffstat (limited to 'proto/ospf/rt.h')
| -rw-r--r-- | proto/ospf/rt.h | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/proto/ospf/rt.h b/proto/ospf/rt.h index 1ba76e3c..a11748fc 100644 --- a/proto/ospf/rt.h +++ b/proto/ospf/rt.h @@ -16,7 +16,8 @@ typedef struct orta { - int type; + u8 type; /* RTS_OSPF_* */ + u8 nhs_reuse; /* Whether nhs nodes can be reused during merging */ u32 options; /* * For ORT_ROUTER routes, options field are router-LSA style @@ -93,16 +94,24 @@ static inline int rt_is_nssa(ort *nf) * - n.metric1 may be at most a small multiple of LSINFINITY, * therefore sums do not overflow * - n.oa is always non-NULL - * - n.nhs is always non-NULL with one exception - configured stubnet - * nodes (in po->rtf). + * - n.nhs is always non-NULL unless it is configured stubnet + * - n.en is non-NULL for external routes, NULL for intra/inter area routes. * - oa->rtr does not contain calculating router itself * - * There are three types of nexthops in nhs fields: + * There are four 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. + * - configured stubnets (nhs is NULL, only RTS_OSPF orta nodes in po->rtf) + * + * Dummy vlink nexthops and configured stubnets cannot be mixed with + * regular ones, nhs field contains either list of gateway+device nodes, + * one vlink node, or NULL for configured stubnet. + * + * Dummy vlink nexthops can appear in both network (rtf) and backbone area router + * (rtr) tables for regular and inter-area routes, but only if areano > 1. They are + * replaced in ospf_rt_sum_tr() and removed in ospf_rt_abr1(), therefore cannot + * appear in ASBR pre-selection and external routes processing. */ void ospf_rt_spf(struct proto_ospf *po); |