diff options
| author | lynne <lynne@voltanet.io> | 2021-06-11 10:38:42 -0400 |
|---|---|---|
| committer | lynne <lynne@voltanet.io> | 2021-06-18 11:48:18 -0400 |
| commit | c5467a12ea002f4fbedf179e826445d9e3dbd4b8 (patch) | |
| tree | 6d21479d1076024a5b5c250a2a476ae828ceee37 | |
| parent | 9b1bc4d661381a822d3285b62177c182ede8afcc (diff) | |
ospf6: Drop LSA with bad seqnumber
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>
| -rw-r--r-- | ospf6d/ospf6_flood.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/ospf6d/ospf6_flood.c b/ospf6d/ospf6_flood.c index ac16e53d63..eea5247d0b 100644 --- a/ospf6d/ospf6_flood.c +++ b/ospf6d/ospf6_flood.c @@ -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); |