Reliable Datagram Sockets

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.

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.

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Reliable Datagram Sockets

Header

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