netdev - RE: [PATCH 02/05] ipv6: RFC4214 Support

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Date:	Wed, 7 Nov 2007 08:12:08 -0800
From:	"Templin, Fred L" <Fred.L.Templin@...ing.com>
To:	"Ingo Oeser" <netdev@...eo.de>
Cc:	<netdev@...r.kernel.org>
Subject: RE: [PATCH 02/05] ipv6: RFC4214 Support

Thanks for these, Ingo. Will fix and test immediately.

Fred
fred.l.templin@...ing.com 

> -----Original Message-----
> From: Ingo Oeser [mailto:netdev@...eo.de] 
> Sent: Wednesday, November 07, 2007 7:59 AM
> To: Templin, Fred L
> Cc: netdev@...r.kernel.org
> Subject: Re: [PATCH 02/05] ipv6: RFC4214 Support
> 
> Hi Fred,
> 
> some comments.
> 
> Templin, Fred L schrieb:
> > From: Fred L. Templin <fred.l.templin@...ing.com>
> > 
> > This is experimental support for the Intra-Site Automatic
> > Tunnel Addressing Protocol (ISATAP) per RFC4214. It uses
> > the SIT module, and is configured using the unmodified
> > "ip" utility with device names beginning with: "isatap".
> > 
> > The following diffs are specific to the Linux 2.6.23
> > kernel distribution.
> > 
> > Signed-off-by: Fred L. Templin <fred.l.templin@...ing.com>
> > 
> > ---
> > 
> > --- linux-2.6.23/include/net/addrconf.h.orig	2007-10-09
> > 13:31:38.000000000 -0700
> > +++ linux-2.6.23/include/net/addrconf.h	2007-10-26 
> 10:49:40.000000000
> > -0700
> > @@ -241,6 +241,34 @@ static inline int ipv6_addr_is_ll_all_ro
> >  		addr->s6_addr32[3] == htonl(0x00000002));
> >  }
> >  
> > +#if defined(CONFIG_IPV6_ISATAP)
> > +static inline int ipv6_isatap_eui64(u8 *eui, __be32 *addr)
> "addr" is only used for reading, not writing. No need to pass 
> it as a pointer.
> 
> > +{
> > +	__be32 ipv4 = ntohl(*addr);
> 
> ntohl(be32_value) != be32_value, so the _be32 attribution of ipv4 
> is wrong here and sparse will scream.
> 
> > +
> > +	eui[0] = 0;
> > +
> > +	/* Check for RFC3330 global address ranges */
> > +	if (((ipv4 >= 0x01000000) && (ipv4 < 0x0a000000)) ||
> > +	    ((ipv4 >= 0x0b000000) && (ipv4 < 0x7f000000)) ||
> > +	    ((ipv4 >= 0x80000000) && (ipv4 < 0xa9fe0000)) ||
> > +	    ((ipv4 >= 0xa9ff0000) && (ipv4 < 0xac100000)) ||
> > +	    ((ipv4 >= 0xac200000) && (ipv4 < 0xc0a80000)) ||
> > +	    ((ipv4 >= 0xc0a90000) && (ipv4 < 0xc6120000)) ||
> > +	    ((ipv4 >= 0xc6140000) && (ipv4 < 0xe0000000))) eui[0] |=
> > 0x2;
> > +
> 
> Instead of converting network to host byte order at runtime 
> and comparing the results to constants, let the compiler convert
> the constants to network byte order and compare in network order.
> 
> so use:
> 
>  if (((*addr >= htonl(0x01000000)) && (*addr < 
> htonl(0x0a000000))) || ....
> 
> instead. The compiler will notice that "0x01000000" is a 
> constant and will
> use "_constant_htonl()" automatically.
> 
> 
> > +	eui[1] = 0; eui[2] = 0x5E; eui[3] = 0xFE;
> > +	memcpy (eui+4, addr, 4);
> > +	return (0);
> > +}
> 
> Nitpick: 
> 	"return" is not a function. Please write "return 0;" instead.
> 
> > +
> > +static inline int ipv6_addr_is_isatap(const struct in6_addr *addr)
> > +{
> > +       return (addr->s6_addr32[2] == 
> __constant_htonl(0x02005EFE) ||
> > +               addr->s6_addr32[2] == __constant_htonl(0x00005EFE));
> > +}
> > +#endif
> 
> The compiler will notice that "0x01000000" is a constant and will
> use "_constant_htonl()" automatically. Please use simply htonl().
> 
> 
> Best Regards
> 
> Ingo Oeser
> 
-
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