[PATCH v2 net-next 00/11] net: Kernel side filtering for route dumps

[David Ahern <dsahern@kernel.org>]

From: David Ahern <dsahern@gmail.com>

Implement kernel side filtering of route dumps by protocol (e.g., which
routing daemon installed the route), route type (e.g., unicast), table
id and nexthop device.

iproute2 has been doing this filtering in userspace for years; pushing
the filters to the kernel side reduces the amount of data the kernel
sends and reduces wasted cycles on both sides processing unwanted data.
These initial options provide a huge improvement for efficiently
examining routes on large scale systems.

v2
- better handling of requests for a specific table. Rather than walking
  the hash of all tables, lookup the specific table and dump it
- refactor mr_rtm_dumproute moving the loop over the table into a
  helper that can be invoked directly
- add hook to return NLM_F_DUMP_FILTERED in DONE message to ensure
  it is returned even when the dump returns nothing

David Ahern (11):
  netlink: Add answer_flags to netlink_callback
  net: Add struct for fib dump filter
  net/ipv4: Plumb support for filtering route dumps
  net/ipv6: Plumb support for filtering route dumps
  net/mpls: Plumb support for filtering route dumps
  ipmr: Refactor mr_rtm_dumproute
  net: Plumb support for filtering ipv4 and ipv6 multicast route dumps
  net: Enable kernel side filtering of route dumps
  net/mpls: Handle kernel side filtering of route dumps
  net/ipv6: Bail early if user only wants cloned entries
  net/ipv4: Bail early if user only wants prefix entries

 include/linux/mroute_base.h |  11 +++-
 include/linux/netlink.h     |   1 +
 include/net/ip6_route.h     |   1 +
 include/net/ip_fib.h        |  17 ++++--
 net/ipv4/fib_frontend.c     |  76 ++++++++++++++++++++++----
 net/ipv4/fib_trie.c         |  37 +++++++++----
 net/ipv4/ipmr.c             |  22 ++++++--
 net/ipv4/ipmr_base.c        | 126 ++++++++++++++++++++++++++++++++------------
 net/ipv6/ip6_fib.c          |  34 +++++++++---
 net/ipv6/ip6mr.c            |  21 ++++++--
 net/ipv6/route.c            |  40 +++++++++++---
 net/mpls/af_mpls.c          |  92 +++++++++++++++++++++++++++-----
 net/netlink/af_netlink.c    |   3 +-
 13 files changed, 386 insertions(+), 95 deletions(-)

-- 
2.11.0