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ospf6: Drop LSA with bad seqnumber

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In RFC 2328 seqnumber 0x80000000 is reserved and not used.   If an LSA
is received with seqnumber the LSA is now dropped and a debug error log
is printed.

Signed-off-by: Lynne Morrison <lynne@voltanet.io>
This commit is contained in:
lynne 2021-06-11 10:38:42 -04:00
parent 9b1bc4d661
commit c5467a12ea
1 changed files with 12 additions and 0 deletions
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12
ospf6d/ospf6_flood.c
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@ -811,6 +811,18 @@ void ospf6_receive_lsa(struct ospf6_neighbor *from,
ismore_recent = 1;
assert(from);
/* if we receive a LSA with invalid seqnum drop it */
if (ntohl(lsa_header->seqnum) - 1 == OSPF_MAX_SEQUENCE_NUMBER) {
if (IS_OSPF6_DEBUG_EXAMIN_TYPE(lsa_header->type)) {
zlog_debug(
"received lsa [%s Id:%pI4 Adv:%pI4] with invalid seqnum 0x%x, ignore",
ospf6_lstype_name(lsa_header->type),
&lsa_header->id, &lsa_header->adv_router,
ntohl(lsa_header->seqnum));
}
return;
}
/* make lsa structure for received lsa */
new = ospf6_lsa_create(lsa_header);