Re: [B.A.T.M.A.N.] [PATCH] batman-adv: move the ttl field to the third position of unicast_* packets

[Sven Eckelmann <sven@narfation.org>]

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Marek Lindner wrote:
> On Saturday 28 May 2011 00:20:21 Sven Eckelmann wrote:
> > >  struct unicast_frag_packet {
> > >  
> > >       uint8_t  packet_type;
> > >       uint8_t  version;  /* batman version field */
> > > 
> > > -     uint8_t  dest[6];
> > > 
> > >       uint8_t  ttl;
> > > 
> > > +     uint8_t  align;
> > > +     uint8_t  dest[6];
> > > 
> > >       uint8_t  flags;
> > > 
> > > +     uint8_t  align;
> > > 
> > >       uint8_t  orig[6];
> > >       uint16_t seqno;
> > >  
> > >  } __packed;
> > 
> > Wait a second - are there two "align" in a single struct. Sry, have to
> > Nack  that one :)
> 
> Yes, I suggested that because the tt patches will replace the first align
> with the ttvn field.

But it doesn't compile. I cannot forward stuff which is too broken. And 
personally I don't care who suggested it when my builtin c-parser explodes.

Ok, now I did the "work" to apply and and to compile that stuff to prove my 
point. Here are the slightly shortened results (gcc-4.6 from sid):

  CC [M]  aggregation.o
In file included from types.h:27:0,
                 from main.h:121,
                 from aggregation.c:22:
packet.h:114:11: error: duplicate member ‘align’
make[2]: *** [aggregation.o] Error 1
make[1]: *** [_module_/batman-adv] Error 2
make[1]: Leaving directory `linux-2.6.39'
make: *** [all] Error 2

My suggestion: Rename the first align in every packet structure to 'reserved'.

Then to the next part which I don't like: the patch forgot to touch 
batman_packet, icmp_packet, icmp_packet_rr, bcast_packet and vis_packet. It 
doesn't make sense to patch half of the on-wire types to reduce the number of 
COMPAT_VERSIONs.

Kind regards,
	Sven

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