netdev - RE: [RFCv3 bluetooth-next 3/4] ipv6: add ipv6_addr_prefix

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Date:	Tue, 1 Dec 2015 11:51:25 +0000
From:	"Duda, Lukasz" <Lukasz.Duda@...dicsemi.no>
To:	Alexander Aring <alex.aring@...il.com>,
	"linux-wpan@...r.kernel.org" <linux-wpan@...r.kernel.org>
CC:	"linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"mcr@...delman.ca" <mcr@...delman.ca>,
	"martin.gergeleit@...rm.de" <martin.gergeleit@...rm.de>,
	"David S . Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	"Patrick McHardy" <kaber@...sh.net>
Subject: RE: [RFCv3 bluetooth-next 3/4] ipv6: add ipv6_addr_prefix_copy


> -----Original Message-----
> From: Alexander Aring [mailto:alex.aring@...il.com]
> Sent: Sunday, November 29, 2015 12:35
> To: linux-wpan@...r.kernel.org
> Cc: linux-bluetooth@...r.kernel.org; netdev@...r.kernel.org;
> kernel@...gutronix.de; mcr@...delman.ca; Duda, Lukasz;
> martin.gergeleit@...rm.de; Alexander Aring; David S . Miller; Alexey
> Kuznetsov; James Morris; Hideaki YOSHIFUJI; Patrick McHardy
> Subject: [RFCv3 bluetooth-next 3/4] ipv6: add ipv6_addr_prefix_copy
> 
> This patch adds a static inline function ipv6_addr_prefix_copy which copies a
> ipv6 address prefix(argument pfx) into the ipv6 address prefix.
> The prefix len is given by plen as bits. This function mainly based on
> ipv6_addr_prefix which copies one address prefix from address into a new
> ipv6 address destination and zero all other address bits.
> 
> The difference is that ipv6_addr_prefix_copy don't get a prefix from an
> ipv6 address, it sets a prefix to an ipv6 address with keeping other address
> bits. The use case is for context based address compression inside 6LoWPAN
> IPHC header which keeping ipv6 prefixes inside a context table to lookup
> address-bits without sending them.
> 
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
> Cc: James Morris <jmorris@...ei.org>
> Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
> Cc: Patrick McHardy <kaber@...sh.net>
> Signed-off-by: Alexander Aring <alex.aring@...il.com>
> ---
>  include/net/ipv6.h | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/include/net/ipv6.h b/include/net/ipv6.h index e1a10b0..cd3881e6
> 100644
> --- a/include/net/ipv6.h
> +++ b/include/net/ipv6.h
> @@ -382,6 +382,21 @@ static inline void ipv6_addr_prefix(struct in6_addr
> *pfx,
>  		pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);  }
> 
> +static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
> +					 const struct in6_addr *pfx,
> +					 int plen)
> +{
> +	/* caller must guarantee 0 <= plen <= 128 */
> +	int o = plen >> 3,
> +	    b = plen & 0x7;
> +
> +	memcpy(addr->s6_addr, pfx, o);
> +	if (b != 0) {
> +		addr->s6_addr[o] &= ~(0xff00 >> b);
> +		addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
> +	}
> +}
> +
>  static inline void __ipv6_addr_set_half(__be32 *addr,
>  					__be32 wh, __be32 wl)
>  {
> --
> 2.6.1

Acked-by: Łukasz Duda <lukasz.duda@...dicsemi.no>
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