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Merge pull request #6460 from rgirada/ospf_external_lsa

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ospfd: External LSA lookup in LSDB failed in a specific scenario
This commit is contained in:
Donald Sharp 2020-06-10 12:35:17 -04:00 committed by GitHub
commit b71ca5ae42
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1 changed files with 24 additions and 14 deletions
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38
ospfd/ospf_asbr.c
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@ -213,25 +213,35 @@ struct ospf_lsa *ospf_external_info_find_lsa(struct ospf *ospf,
struct as_external_lsa *al;
struct in_addr mask, id;
/* Fisrt search the lsdb with address specifc LSID
* where all the host bits are set, if there a matched
* LSA, return.
* Ex: For route 10.0.0.0/16, LSID is 10.0.255.255
* If no lsa with above LSID, use received address as
* LSID and check if any LSA in LSDB.
* If LSA found, check if the mask is same b/w the matched
* LSA and received prefix, if same then it is the LSA for
* this prefix.
* Ex: For route 10.0.0.0/16, LSID is 10.0.0.0
*/
masklen2ip(p->prefixlen, &mask);
id.s_addr = p->prefix.s_addr | (~mask.s_addr);
lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA, id,
ospf->router_id);
if (lsa)
return lsa;
lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
p->prefix, ospf->router_id);
if (!lsa)
return NULL;
al = (struct as_external_lsa *)lsa->data;
masklen2ip(p->prefixlen, &mask);
if (mask.s_addr != al->mask.s_addr) {
id.s_addr = p->prefix.s_addr | (~mask.s_addr);
lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
id, ospf->router_id);
if (!lsa)
return NULL;
if (lsa) {
al = (struct as_external_lsa *)lsa->data;
if (mask.s_addr == al->mask.s_addr)
return lsa;
}
return lsa;
return NULL;
}