mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-01-28 18:22:49 -05:00
d949cfedbc
The initial session number when a link is created is based on a random value, taken from struct tipc_net->random. It is then incremented for each link reset to avoid mixing protocol messages from different link sessions. However, when a bearer is reset all its links are deleted, and will later be re-created using the same random value as the first time. This means that if the link never went down between creation and deletion we will still sometimes have two subsequent sessions with the same session number. In virtual environments with potentially long transmission times this has turned out to be a real problem. We now fix this by randomizing the session number each time a link is created. With a session number size of 16 bits this gives a risk of session collision of 1/64k. To reduce this further, we also introduce a sanity check on the very first STATE message arriving at a link. If this has an acknowledge value differing from 0, which is logically impossible, we ignore the message. The final risk for session collision is hence reduced to 1/4G, which should be sufficient. Signed-off-by: LUU Duc Canh <canh.d.luu@dektech.com.au> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> 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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.