computer science

Reliable Datagram Sockets

Reliable Datagram Sockets is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Reliable Datagram Sockets rather than just read about it. In short: Reliable Datagram Sockets (RDS) is a high-performance, low-latency, reliable, connectionless protocol for delivering datagrams. It is developed by Oracle Corporation.

Key takeaways

Reliable Datagram Sockets belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Reliable Datagram Sockets to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Reliable Datagram Sockets from memory before moving on to harder problems.

Reference excerpt

Reliable Datagram Sockets (RDS) is a high-performance, low-latency, reliable, connectionless protocol for delivering datagrams. It is developed by Oracle Corporation. It was included in the Linux kernel 2.6.30 which was released on 9 June 2009. The code was contributed by the OpenFabrics Alliance (OFA). On October 19, 2010, VSR announced CVE-2010-3904, a vulnerability within the Linux 2.6.30 kernel which could result in a local privilege escalation via the kernel's implementation of RDS. This was subsequently fixed in Linux 2.6.36. On May 8, 2019, CVE-2019-11815 was published, regarding a race condition in the Linux RDS implementation that could lead to a use-after-free bug and possible arbitrary code execution. The bug has been fixed in Linux 5.0.8.

Header

Sequence (h_sequence): 64 bits The sequence number. Acknowledge (h_ack): 64 bits The sequence number of last received message. Length (h_len): 32 bits The length of the message payload. Source Port (h_sport): 16 bits Identifies the sending port. Destination Port (h_dport): 16 bits Identifies the receiving port. Flags (h_flags): 8 bits Described below. Credits (h_credit): 8 bits Credits given (used for credit-based flow control). Padding (h_padding): 32 bits Padding for 64-bit struct alignment. Checksum (h_csum): 16 bits 1's complement header checksum. Extension Header (h_exthdr): 128 bits Optional extension header space.

See also Transmission Control Protocol Stream Control Transmission Protocol User Datagram Protocol UDP-Lite

References

External links Oss.oracle.com Archived 2023-02-03 at the Wayback Machine Oss.oracle.com Archived 2021-02-28 at the Wayback Machine https://oss.oracle.com/projects/rds/dist/documentation/rds-3.1-spec.html

Worked examples

Example 1 — a first encounter with Reliable Datagram Sockets

Start with the simplest possible case. Write down what Reliable Datagram Sockets claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Reliable Datagram Sockets before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Reliable Datagram Sockets ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Reliable Datagram Sockets

In research: Reliable Datagram Sockets appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Reliable Datagram Sockets in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Reliable Datagram Sockets is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer network stubs, Internet protocols, Network socket, so understanding it makes those chapters shorter.
In everyday life: Look for Reliable Datagram Sockets outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Reliable Datagram Sockets in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Reliable Datagram Sockets means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Reliable Datagram Sockets out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Reliable Datagram Sockets in simple terms?

Reliable Datagram Sockets (RDS) is a high-performance, low-latency, reliable, connectionless protocol for delivering datagrams. It is developed by Oracle Corporation.

Why does Reliable Datagram Sockets matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Reliable Datagram Sockets?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Reliable Datagram Sockets.