TFTP OACK (`tftp_oack`)

Layer: Application and control
Header: variable length
Notes: Application protocols

Reached from

Lower layer	Selector	Value
`tftp`	`opcode`	6 (0x0006) (re-decodes this layer)

Fields

Field	Type	Default	Auto	Description
`opcode`	`enum(16)`	`6` (oack)		TFTP opcode (1 = RRQ, 2 = WRQ, 3 = DATA, 4 = ACK, 5 = ERROR, 6 = OACK).
`options`	`list<struct>` — rest of the PDU	1 items		Option name / value string pairs (RFC 2347): blksize, timeout, tsize, windowsize, …

`opcode`

Value	Name
1 (0x0001)	`rrq`
2 (0x0002)	`wrq`
3 (0x0003)	`data`
4 (0x0004)	`ack`
5 (0x0005)	`error`
6 (0x0006)	`oack`

`options`

Each item is a group of the fields below.

Field	Type	Default	Auto	Description
`name`	`cstring`	`"blksize"`
`value`	`cstring`	`"1428"`

Constraints

Level	Rule
warning	`opcode` = 6

Sample templates

tftp-oack — templates/protocols/app/tftp-oack.wpg.yaml