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Michal Kubecek says: ==================== make nla_nest_start() add NLA_F_NESTED flag One of the comments in recent review of the ethtool netlink series pointed out that proposed ethnl_nest_start() helper which adds NLA_F_NESTED to second argument of nla_nest_start() is not really specific to ethtool netlink code. That is hard to argue with as closer inspection revealed that exactly the same helper already exists in ipset code (except it's a macro rather than an inline function). Another observation was that even if NLA_F_NESTED flag was introduced in 2007, only few netlink based interfaces set it in kernel generated messages and even many recently added APIs omit it. That is unfortunate as without the flag, message parsers not familiar with attribute semantics cannot recognize nested attributes and do not see message structure; this affects e.g. wireshark dissector or mnl_nlmsg_fprintf() from libmnl. This is why I'm suggesting to rename existing nla_nest_start() to different name (nla_nest_start_noflag) and reintroduce nla_nest_start() as a wrapper adding NLA_F_NESTED flag. This is implemented in first patch which is mostly generated by spatch. Second patch drops ipset helper macros which lose their purpose. Third patch cleans up minor coding style issues found by checkpatch.pl in first patch. We could leave nla_nest_start() untouched and simply add a wrapper adding NLA_F_NESTED but that would probably preserve the state when even most new code doesn't set the flag. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.