datapath: Pass nf_hook_state to nf_conntrack_in()

datapath: Pass nf_hook_state to nf_conntrack_in()

Upstream Commit:
    commit 93e66024b0249cec81e91328c55a754efd3192e0
    Author: Florian Westphal <fw@strlen.de>
    Date:   Wed Sep 12 15:19:07 2018 +0200

    netfilter: conntrack: pass nf_hook_state to packet and error handlers

    nf_hook_state contains all the hook meta-information: netns, protocol family,
    hook location, and so on.

    Instead of only passing selected information, pass a pointer to entire
    structure.

    This will allow to merge the error and the packet handlers and remove
    the ->new() function in followup patches.

    Signed-off-by: Florian Westphal <fw@strlen.de>
    Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This patch backports the above upstream patch to OVS and fixes compiling
errors on RHEL kernels.

Cc: Florian Westphal <fw@strlen.de>
Tested-by: Greg Rose <gvrose8192@gmail.com>
Reviewed-by: Greg Rose <gvrose8192@gmail.com>
Acked-by: Yi-Hung Wei <yihung.wei@gmail.com>
Signed-off-by: Yifeng Sun <pkusunyifeng@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>