Reliable Datagram Sockets
From Wikipedia, the free encyclopedia
Reliable Datagram Sockets (RDS) is a high-performance, low-latency, reliable, connectionless protocol for delivering datagrams. It is developed by Oracle Corporation.
| Communication protocol | |
| Abbreviation | RDS |
|---|---|
| Developer(s) | Oracle Corporation |
| Introduction | June 9, 2009 |
| OSI layer | Transport layer |
| Port(s) | 16385 (RDS-over-TCP) |
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).[1]
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.[2] This was subsequently fixed in Linux 2.6.36.[3]
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.[4] The bug has been fixed in Linux 5.0.8.
Header
| Size (bits) | Name | Description |
|---|---|---|
| be64 | h_sequence | Sequence number |
| be64 | h_ack | Sequence number of last received message |
| be32 | h_len | Length of the message payload |
| be16 | h_sport | Port on source node |
| be16 | h_dport | Port on destination node |
| 8 | h_flags | Described below |
| 8 | h_credit | Credits given (used for credit-based flow control) |
| 32 | h_padding | Padding for 64-bit struct alignment |
| 16 | h_csum | 1's complement header checksum |
| 128 | h_exthdr | Optional extension header space |
- 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.
