Major NPF improvements (merge from upstream):

- Switch to the C11-style atomic primitives using atomic_loadstore(9).

- npfkern: introduce the 'state.key.interface' and 'state.key.direction'
settings. Users can now choose whether the connection state should be
strictly per-interface or global at the configuration level. Keep NAT
logic to be always per-interface, though.

- npfkern: rewrite the G/C worker logic and make it self-tuning.

- npfkern and libnpf: multiple bug fixes; add param exporting; introduce
more parameters. Remove npf_nvlist_{copyin,copyout}() functions and
refactor npfctl_load_nvlist() with others; add npfctl_run_op() to have
a single entry point for operations. Introduce npf_flow_t and clean up
some code.

- npfctl: lots of fixes for the 'npfctl show' logic; make 'npfctl list'
more informative; misc usability improvements and more user-friendly
error messages.

- Amend and improve the manual pages.

NPF: Major rework -- migrate NPF to the libnv library.
- This conversion significantly simplifies the code and moves NPF to
a binary serialisation format (replacing the XML-like format).
- Fix some memory/reference leaks and possibly use-after-free bugs.
- Bump NPF_VERSION as this change makes libnpf incompatible with the
previous versions. Also, different serialisation format means NPF
connection/config saving and loading is not compatible with the
previous versions either.

Thanks to christos@ for extra testing.

branches: 1.8.24; 1.8.26;
Simplify parsing of npf.conf elements, create the npfvar_t when a value is
parsed (to be used as a general structured for variables and inlined values),
few misc improvements.

- Convert NPF to use BPF byte-code by default. Compile BPF byte-code in
npfctl(8) and generate separate marks to describe the filter criteria.
- Rewrite 'npfctl show' functionality and fix some of the bugs.
- npftest: add a test for BPF COP.
- Bump NPF_VERSION.

npfctl: extend syntax for extracting interface IP address(es) by the family.

Fix for npfctl show case. Improve some description while here.

Implement dynamic NPF extensions interface. An extension consists of
dynamically loaded module (.so) supplementing npfctl(8) and a kernel
module. Move normalisation and logging functionality into their own
extensions. More improvements to come.

branches: 1.3.2;
teach npf ipv6-icmp
reviewed by rmind@

branches: 1.2.2;
- make each element of a variable hold a type
- change get_type to take an index, so we can get the individual types of
each element (since primitive elements can be in lists)
- make port_range primitive
- add a routine to convert a variable of primitives to a variable containing
- only port ranges.

branches: 1.1.2;
Full rewrite of npfctl(8) parser and rework of n-code generation part.
Fixes most of the known bugs and issues with the utility. Note: rule
procedures are not yet (as we want to make them fully modular).

Huge thanks to Martin Husemann who wrote the parser and Christos Zoulas
who wrote intermediate structures and helped to complete the work.

NPF: Major rework -- migrate NPF to the libnv library.
- This conversion significantly simplifies the code and moves NPF to
a binary serialisation format (replacing the XML-like format).
- Fix some memory/reference leaks and possibly use-after-free bugs.
- Bump NPF_VERSION as this change makes libnpf incompatible with the
previous versions. Also, different serialisation format means NPF
connection/config saving and loading is not compatible with the
previous versions either.

Thanks to christos@ for extra testing.

branches: 1.8.24;
Simplify parsing of npf.conf elements, create the npfvar_t when a value is
parsed (to be used as a general structured for variables and inlined values),
few misc improvements.

- Convert NPF to use BPF byte-code by default. Compile BPF byte-code in
npfctl(8) and generate separate marks to describe the filter criteria.
- Rewrite 'npfctl show' functionality and fix some of the bugs.
- npftest: add a test for BPF COP.
- Bump NPF_VERSION.

npfctl: extend syntax for extracting interface IP address(es) by the family.

Fix for npfctl show case. Improve some description while here.

Implement dynamic NPF extensions interface. An extension consists of
dynamically loaded module (.so) supplementing npfctl(8) and a kernel
module. Move normalisation and logging functionality into their own
extensions. More improvements to come.

branches: 1.3.2;
teach npf ipv6-icmp
reviewed by rmind@

branches: 1.2.2;
- make each element of a variable hold a type
- change get_type to take an index, so we can get the individual types of
each element (since primitive elements can be in lists)
- make port_range primitive
- add a routine to convert a variable of primitives to a variable containing
- only port ranges.

branches: 1.1.2;
Full rewrite of npfctl(8) parser and rework of n-code generation part.
Fixes most of the known bugs and issues with the utility. Note: rule
procedures are not yet (as we want to make them fully modular).

Huge thanks to Martin Husemann who wrote the parser and Christos Zoulas
who wrote intermediate structures and helped to complete the work.