nf_tables: atomic transactional updates (v2)

From: Pablo Neira Ayuso <pablo@netfilter.org>

Hi,

This patchset comes after this patch:

http://patchwork.ozlabs.org/patch/224196/

and results from discussion with Tomasz and Patrick, the summary
of changes for the first patch are:

* Get rid of the extra struct list_head per rule as discussed with
  Patrick McHardy. With this patch, a temporary object is allocated
  to store the rule update information.

* A new begin operation to explicitly enter the transaction mode,
  and remove the COMMIT flag per rule, as suggested by Tomasz.

* The commit and abort loops have been also simplified from ideas
  extracted after discusion with Tomasz Bursztyka. Basically,
  there is a single list per net namespace that contains pending
  rule updates.

* The transaction list is now owned by the netlink socket portid that
  adds the first rule that waits to be committed. If another process
  wants to perform some rule-set update, it hits -EBUSY.

* Pending updates, if not committed, are destroyed when the process
  explicit aborts or finishes its execution.

The second patch uses NLM_F_DUMP_INTR if the dump in interrupted by
an update.

Comments welcome.

Pablo Neira Ayuso (2):
  netfilter: nf_tables: rework atomic transaction updates
  netfilter: nf_tables: set NLM_F_DUMP_INTR if dump is invalid

 include/net/netfilter/nf_tables.h        |   21 ++-
 include/net/netns/nftables.h             |    4 +-
 include/uapi/linux/netfilter/nf_tables.h |    7 +-
 net/netfilter/nf_tables_api.c            |  242 +++++++++++++++++++-----------
 4 files changed, 179 insertions(+), 95 deletions(-)

-- 
1.7.10.4

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