[iptables,v2,00/12] Implement among match support

Changes since v1:
- Rebased onto my performance improvements patch series.
- Aligned set caching routines with changes in above series.
- Fixed patch ordering so builds are not broken intermittently.
- Replaced magic numbers by defines or offsetof() statements. Note that
  I did not move any defines into libnftnl; the remaining ones are for
  values in sets' key_type attribute which neither libnftnl nor kernel
  care about. Setting that is merely for compatibility with nft tool.

This series ultimately adds among match support to ebtables-nft. The
implementation merely shares the user interface with legacy one,
internally the code is distinct: libebt_among.c does not make use of the
wormhash data structure but a much simpler one for "temporary" storage
of data until being converted into an anonymous set and associated
lookup expression.

Patches 1 to 5 implement required changes and are rather boring by
themselves: When converting an nftnl rule to iptables command state,
cache access is required (to lookup set references).

Patch 6 simplifies things a bit with the above in place.

Patches 7 to 11 implement anonymous set support.

Patch 12 then adds the actual among match implementation for
ebtables-nft.

Phil Sutter (12):
  nft: family_ops: Pass nft_handle to 'add' callback
  nft: family_ops: Pass nft_handle to 'rule_find' callback
  nft: family_ops: Pass nft_handle to 'print_rule' callback
  nft: family_ops: Pass nft_handle to 'rule_to_cs' callback
  nft: Keep nft_handle pointer in nft_xt_ctx
  nft: Eliminate pointless calls to nft_family_ops_lookup()
  nft: Fetch sets when updating rule cache
  nft: Support NFT_COMPAT_SET_ADD
  nft: Bore up nft_parse_payload()
  nft: Embed rule's table name in nft_xt_ctx
  nft: Support parsing lookup expression
  nft: bridge: Rudimental among extension support

 extensions/libebt_among.c  | 278 ++++++++++++++++++++
 extensions/libebt_among.t  |  16 ++
 iptables/ebtables-nft.8    |  66 ++---
 iptables/nft-arp.c         |  13 +-
 iptables/nft-bridge.c      | 244 +++++++++++++++++-
 iptables/nft-bridge.h      |  21 ++
 iptables/nft-ipv4.c        |  10 +-
 iptables/nft-ipv6.c        |  10 +-
 iptables/nft-shared.c      |  70 +++---
 iptables/nft-shared.h      |  26 +-
 iptables/nft.c             | 502 +++++++++++++++++++++++++++++++++----
 iptables/nft.h             |  14 +-
 iptables/xtables-eb.c      |   1 +
 iptables/xtables-monitor.c |  17 +-
 iptables/xtables-save.c    |   3 +
 15 files changed, 1135 insertions(+), 156 deletions(-)
 create mode 100644 extensions/libebt_among.c
 create mode 100644 extensions/libebt_among.t