[PATCH v1 net-next 0/5] ipv4: fib: Remove RTNL in fib_net_exit_batch().

[Kuniyuki Iwashima <kuniyu@google.com>]

Currently, we flush all IPv4 routes at ->exit_batch() during
netns dismantle, which requires an extra RTNL.

IPv4 routes are not added from the fast path unlike IPv6, so
we can flush routes before default_device_exit_batch().

However, there is implicit ordering between ip_fib_net_exit()
and default_device_exit_batch().

This series detangles it and moves ip_fib_net_exit() to
 ->exit_rtnl() to save the RTNL dance.

The same change for IPv6 will need more work.


Kuniyuki Iwashima (5):
  ipv4: fib: Flush all fib_info in fib_table_flush() during netns
    dismantle.
  ipv4: fib: Call fib_proc_exit() and nl_fib_lookup_exit() at
    ->pre_exit().
  ipv4: fib: Free net->ipv4.{fib_table_hash,notifier_ops} without RTNL.
  ipv4: fib: Avoid calling fib_trie_table() in fib_new_table() for dying
    net.
  ipv4: fib: Convert fib_net_exit_batch() to ->exit_rtnl().

 net/ipv4/fib_frontend.c | 37 ++++++++++++++++++-------------------
 net/ipv4/fib_trie.c     | 10 ++--------
 2 files changed, 20 insertions(+), 27 deletions(-)

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2.54.0.1136.gdb2ca164c4-goog