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netfilter: nfnetlink: use net_generic infra
No need to place it in struct net, nfnetlink is a module and usage
doesn't occur in fastpath.
Also remove rcu usage:
Not a single reader of net->nfnl uses rcu accessors.
When exit_batch callbacks are executed the net namespace is already dead
so no calls to these functions are possible anymore (else we'd get NULL
deref crash too).
If the module is removed, then modules that call any of those functions
have been removed too so no calls to nfnl functions are possible either.
The nfnl and nfl_stash pointers in struct net are no longer used, they
will be removed in a followup patch to minimize changes to struct net
(causes rebuild for entire network stack).
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>