From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pablo Neira Ayuso <pablo@netfilter.org>
Subject: Re: [nft PATCH] src: add tee statement support
Date: Tue, 10 Mar 2015 12:34:45 +0100
Message-ID: <20150310113445.GA3814@salvia>
References: <20150309193820.6763.36920.stgit@nfdev.cica.es>
 <CAOkSjBhq2z0kmq3Xd_smgcj+JoVCn7kEJHCRz2ccRc5FTVpiGw@mail.gmail.com>
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To: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
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On Tue, Mar 10, 2015 at 11:31:00AM +0100, Arturo Borrero Gonzalez wrote:
> On 9 March 2015 at 20:38, Arturo Borrero Gonzalez
> <arturo.borrero.glez@gmail.com> wrote:
> > The syntax is:
> >  tee gw <addr> [oifname <str>]
> >
> [...]
> >
> > +tee_stmt               :       tee_stmt_alloc  tee_stmt_opt
> > +                       ;
> > +
> > +tee_stmt_alloc         :       TEE
> > +                       {
> > +                               $$ = tee_stmt_alloc(&@$);
> > +                       }
> > +                       ;
> > +
> > +tee_stmt_opt           :       GW              expr
> > +                       {
> > +                               $<stmt>0->tee.gw = $2;
> > +                       }
> > +                       |       OIFNAME         STRING
> > +                       {
> > +                               $<stmt>0->tee.oifname = strdup($2);
> > +                       }
> > +                       ;
> > +
> 
> This grammar is not completely right.
> 
> However, using something like this:
> 
> tee_stmt                :       TEE             tee_stmt_opts
>                         {
>                                 $$ = tee_stmt_alloc(&@$);
>                         }
>                         ;
> 
> tee_stmt_opts           :       tee_stmt_opts   tee_stmt_opt
>                         |       tee_stmt_opt
>                         ;
> 
> tee_stmt_opt            :       GW              expr
>                         {
>                                 $<stmt>0->tee.gw = $2;
>                         }
>                         |       OIFNAME         string
>                         {
>                                 $<stmt>0->tee.oifname = strdup($2);
>                         }
>                         ;
> 
> lead to shift/reduce conflicts, because expr can be `OIFNAME string'.
> 
> Any idea?

You use STRING instead for GW and make sure from the evaluation step
that this is a valid address?