a4878eeae3
Its currently not allowed to perform queries on a map, for example:
table t {
map m {
typeof ip saddr : meta mark
..
chain c {
ip saddr @m counter
will fail, because kernel requires that userspace provides a destination
register when the referenced set is a map.
However, internally there is no real distinction between sets and maps,
maps are just sets where each key is associated with a value.
Relax this so that maps can be used just like sets.
This allows to have rules that query if a given key exists
without making use of the associated value.
This also permits != checks which don't work for map lookups.
When no destination reg is given for a map, then permit this for named
maps.
Data and dump paths need to be updated to consider priv->dreg_set
instead of the 'set-is-a-map' check.
Checks in reduce and validate callbacks are not changed, this
can be relaxed later if a need arises.
Signed-off-by: Florian Westphal <fw@strlen.de>
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.