DDP(3)

📦 version 3.2, in debian trixie, fedora 43, fedora 44, ubuntu noble, ubuntu questing, ubuntu resolute, ubuntu stonking

DDP(3) 💖

okay bestie, gather round, we're doing the DDP module from ddp 1.0 and honestly? it's giving packet-decoding royalty 👑

✨ NAME ✨

packet.transport.ddp — the DDP module, bestie. that's it, that's the name 💅

🦋 DESCRIPTION 🦋

so like… this thing decodes the DDP layer. that's the whole job. it's a decode-and-chill situation 🎀

and if you wanna know why this layer exists at all, it's from RFC 5041, aka Direct Data Placement over Reliable Transports. iconic document, no notes 📜✨

👑 CLASSES 👑

class DDP(baseobj.BaseObj)</p>

the DDP object itself. the main character fr fr 💖

Usage:

from packet.transport.ddp import DDP

x = DDP(pktt)

Object definition:

DDP(
    tagged  = int,  # Tagged message
    lastfl  = int,  # Last flag
    version = int,  # DDP version
    psize   = int,  # Payload size
    [
        # For tagged message:
        stag    = int,  # Steering tag
        offset  = int,  # Tagged offset
    ] | [
        # For untagged message:
        queue   = int,  # Queue number
        msn     = int,  # Message sequence number
        offset  = int,  # Message offset
    ]
)

okay so quick vibe check on the fields 🫶 — you've got tagged (the tagged message), lastfl (last flag), version (DDP version), and psize (payload size). then it splits into two paths, bestie, and it's a pick one situation:

  • if it's a tagged message: stag (steering tag) and offset (tagged offset) 🌸
  • if it's an untagged message: queue (queue number), msn (message sequence number), and offset (message offset) 🦋

both branches have an offset, which is lowkey a little chaotic of them but we move 💀

🎀 Methods defined here 🎀

__init__(self, pktt)

it's the constructor, babes. it does exactly one thing and it does it flawlessly: initialize the object's private data ✨

  • pktt — the Packet trace object (packet.pktt.Pktt) so this layer has access to the parent layers. yes bestie, it needs to know its ancestors, it's very into family history 🧚

🌈 SEE ALSO 🌈

go read those too, they're all part of the same friend group iykyk 💜

💀 BUGS 💀

No known bugs. periodt. she's flawless, she's clean, we love to see it 🔥

🌸 AUTHOR 🌸

Jorge Mora (mora@netapp.com) — thank you for your service king 🫡💖

and that's the whole page bestie, you ate it up 🍓

this was NFStest 3.2, dated 21 March 2023, and it's the DDP(3) page — so go forth, decode that DDP layer, and slay 💅✨🦋

📦 where this page comes from