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From: Sven Eckelmann <sven@narfation.org>
Date: Tue, 03 May 2016 14:54:26 +0200
Message-ID: <3986955.uBauJeRErD@bentobox>
In-Reply-To: <20160503124719.GB16952@lunn.ch>
References: <1462222618-29761-1-git-send-email-andrew@lunn.ch>
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Subject: Re: [B.A.T.M.A.N.] [PATCHv2] batctl: Use netlink to replace some of
	debugfs
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To: Andrew Lunn <andrew@lunn.ch>
Cc: b.a.t.m.a.n@lists.open-mesh.org

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On Tuesday 03 May 2016 14:47:19 Andrew Lunn wrote:
> On Tue, May 03, 2016 at 02:26:34PM +0200, Sven Eckelmann wrote:
> > On Tuesday 03 May 2016 14:20:46 Andrew Lunn wrote:
> > [...]
> > > There does not seem to be a way to say that BATADV_ATTR_VERSION is
> > > also an NLA_STRING.
> > 
> > Please check "policy" in the link I gave you.
> 
> I did. And i still don't get how you can check the type.
> 
>   Andrew

   struct nla_policy {
            uint16_t        type;
            uint16_t        minlen;
            uint16_t        maxlen;
   };

there is an entry for type, minlen and maxlen. The type member is to check for
the type. Here is an example how to check the type from batctl:

    static struct nla_policy info_data_link_policy[IFLA_MAX + 1] = {
    	[IFLA_LINKINFO]	= { .type = NLA_NESTED },
	    [IFLA_LINK]	= { .type = NLA_U32 },
    };
    [...]
    	ret = nlmsg_parse(n, sizeof(struct ifinfomsg), tb, IFLA_MAX,
    			  info_data_link_policy);

Kind regards,
	Sven
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