Dear Authors,
Can you please confirm the actions need to take while validating extended TLVs
for malformed extended LSA check while parsing the LSA.
Can you please confirm which case we can discard LSA or in which case we will
ignore TLV, but LSA is consider as valid and processed other TLVs.
S.No Scenario
Action
1 Sum of TLV lengths is more than total LSA body length
Discard the LSA by considering malformed
packet, no ACK
2 Sum of TLV lengths is same as total LSA body length, but
Ignore the current TLV and continue to next
TLV (or)
Sub TLV length/ sum of sub TLV length in one TLV
Discard the LSA by considering
malformed packet with no ACK??
exceeds TLV length
3. Sum of TLV and sub TLV lengths are same as total LSA
body length
But TLV length is not correct as per TLV type
(Ex: Router Link TLV has fixed length of 16 bytes, but
provided
8 bytes data in one of router Link TLV and TLV length
also set as 8 bytes) Discard the current TLV and continue to next TLV (or)
Discard the LSA by considering malformed packet with no ACK??
4. Sum of TLV and sub TLV lengths are same as total LSA body
length
TLV length is correct as per length of sub TLVs, but sub
TLV length is
not correct as per sub TLV type
(Ex: Adj SID sub TLV has at least fixed length of 8
bytes, but provided
4 bytes data in one of Adj SID sub TLV and sub TLV
length also set as 4 bytes) Discard the current TLV and continue to next
TLV (or)
Discard the LSA by considering malformed packet with no ACK??
Regards,
Veerendranath
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