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Implement the getsockopt SOL_TLS TLS_RX which is currently missing. The primary usecase is to use it in conjunction with TCP_REPAIR to checkpoint/restore the TLS record layer state. TLS connection state usually exists on the user space library. So basically we can easily extract it from there, but when the TLS connections are delegated to the kTLS, it is not the case. We need to have a way to extract the TLS state from the kernel for both of TX and RX side. The new TLS_RX getsockopt copies the crypto_info to user in the same way as TLS_TX does. We have described use cases in our research work in Netdev 0x14 Transport Workshop [1]. Also, there is an TLS implementation called tlse [2] which supports TLS connection migration. They have support of kTLS and their code shows that they are expecting the future support of this option. [1] https://speakerdeck.com/yutarohayakawa/prism-proxies-without-the-pain [2] https://github.com/eduardsui/tlse Signed-off-by: Yutaro Hayakawa <yhayakawa3720@gmail.com> Reviewed-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.