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From: Sven Eckelmann <sven@narfation.org>
Date: Mon, 18 Apr 2016 12:59:19 +0200
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Subject: Re: [B.A.T.M.A.N.] [RFC v2 0/5] batman-adv netlink query API
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To: Matthias Schiffer <mschiffer@universe-factory.net>
Cc: b.a.t.m.a.n@lists.open-mesh.org

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On Friday 18 March 2016 12:53:37 Matthias Schiffer wrote:
[...]
> Thanks for the build testing, I haven't put too much thought into the
> compat issues yet. The genl_register_family_with_ops error should be easy
> to fix, the struct netlink_skb_parms differences might be more problematic.

The genl_register_family_with_ops error can most likely be solved by

https://git.kernel.org/cgit/linux/kernel/git/backports/backports.git/tree/backport/backport-include/net/genetlink.h?id=a91a3e6e3a6ed6cdbbe942bafe05ae5fcdf41ce9

The netlink_skb_parms most likely can be fixed by redefining NETLINK_CB to
something which casts to a structure with the name portid for the field
pid for Linux < 3.7.

    struct netlink_skb_parms_compat {
            struct scm_creds        creds;
             __u32                   portid;  /* was renamed in 3.7 from "pid" */
             __u32                   dst_group;    
             __u32                   flags;
             struct sock             *sk;
    };

Kind regards,
	Sven
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