1. 26 Sep, 2014 1 commit
    • Pablo Neira Ayuso's avatar
      netfilter: bridge: move br_netfilter out of the core · 34666d46
      Pablo Neira Ayuso authored
      
      
      Jesper reported that br_netfilter always registers the hooks since
      this is part of the bridge core. This harms performance for people that
      don't need this.
      
      This patch modularizes br_netfilter so it can be rmmod'ed, thus,
      the hooks can be unregistered. I think the bridge netfilter should have
      been a separated module since the beginning, Patrick agreed on that.
      
      Note that this is breaking compatibility for users that expect that
      bridge netfilter is going to be available after explicitly 'modprobe
      bridge' or via automatic load through brctl.
      
      However, the damage can be easily undone by modprobing br_netfilter.
      The bridge core also spots a message to provide a clue to people that
      didn't notice that this has been deprecated.
      
      On top of that, the plan is that nftables will not rely on this software
      layer, but integrate the connection tracking into the bridge layer to
      enable stateful filtering and NAT, which is was bridge netfilter users
      seem to require.
      
      This patch still keeps the fake_dst_ops in the bridge core, since this
      is required by when the bridge port is initialized. So we can safely
      modprobe/rmmod br_netfilter anytime.
      
      Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
      Acked-by: default avatarFlorian Westphal <fw@strlen.de>
      34666d46