linux-kernel - Re: [nf-next] netfilter: extend SRH match to support matching previous, next and last SID

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Date:   Mon, 23 Apr 2018 22:16:00 +0200
From:   Ahmed Abdelsalam <amsalam20@...il.com>
To:     Florian Westphal <fw@...len.de>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>, davem@...emloft.net,
        dav.lebrun@...il.com, linux-kernel@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org
Subject: Re: [nf-next] netfilter: extend SRH match to support matching
 previous, next and last SID

On Mon, 23 Apr 2018 22:08:44 +0200
Florian Westphal <fw@...len.de> wrote:

> Ahmed Abdelsalam <amsalam20@...il.com> wrote:
> > > > @@ -50,6 +62,12 @@ struct ip6t_srh {
> > > >  	__u8                    segs_left;
> > > >  	__u8                    last_entry;
> > > >  	__u16                   tag;
> > > > +	struct in6_addr		psid_addr;
> > > > +	struct in6_addr		nsid_addr;
> > > > +	struct in6_addr		lsid_addr;
> > > > +	struct in6_addr		psid_msk;
> > > > +	struct in6_addr		nsid_msk;
> > > > +	struct in6_addr		lsid_msk;
> > > 
> > > This is changing something exposed through UAPI, so you will need a
> > > new revision for this.
> > 
> > Could you please advice what should be done in this case? 
> 
> You need to add
> struct ip6t_srh_v1 {
> 	/* copy of struct ip6t_srh here */
> 
> 	/* new fields go here */
> };
> 
> 
> Look at xt_conntrack.c, conntrack_mt_reg[] for an example of
> multi-revision match.
> 
> You can probably re-origanise code to avoid too much duplication.
> See 5a786232eb69a1f870ddc0cfd69d5bdef241a2ea in nf.git for an example,
> it makes v0 into a v1 struct at runtime and re-uses new v1 code
> for old v0.
> 
> 

Thanks Florian!  

-- 
Ahmed Abdelsalam <amsalam20@...il.com>