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The set of required attributes for a given SRv6 behavior is identified using a bitmap stored in an unsigned long, since the initial design of SRv6 networking in Linux. Recently the same approach has been used for identifying the optional attributes. However, the number of attributes supported by SRv6 behaviors depends on the size of the unsigned long type which changes with the architecture. Indeed, on a 64-bit architecture, an SRv6 behavior can support up to 64 attributes while on a 32-bit architecture it can support at most 32 attributes. To fool-proof the processing of SRv6 behaviors we verify, at compile time, that the set of all supported SRv6 attributes can be encoded into a bitmap stored in an unsigned long. Otherwise, kernel build fails forcing developers to reconsider adding a new attribute or extend the total number of supported attributes by the SRv6 behaviors. Moreover, we replace all patterns (1 << i) with the macro SEG6_F_ATTR(i) in order to address potential overflow issues caused by 32-bit signed arithmetic. Thanks to Colin Ian King for catching the overflow problem, providing a solution and inspiring this patch. Thanks to Jakub Kicinski for his useful suggestions during the design of this patch. v2: - remove the SEG6_LOCAL_MAX_SUPP which is not strictly needed: it can be derived from the unsigned long type. Thanks to David Ahern for pointing it out. Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20210206170934.5982-1-andrea.mayer@uniroma2.it Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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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.