Subject: Re: [patch net-next v2 1/9] net: fib_rules: Check if selector matches all packets

From: Ido Schimmel <[email-masked]>
Date: Wed, 15 Mar 2017 17:30:31 +0200

On Wed, Mar 15, 2017 at 09:15:43AM -0600, David Ahern wrote:
> On 3/15/17 5:05 AM, Jiri Pirko wrote:
> > diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
> > index b6791d9..4ed475d 100644
> > --- a/net/core/fib_rules.c
> > +++ b/net/core/fib_rules.c
> > @@ -23,6 +23,20 @@ static const struct fib_kuid_range fib_kuid_range_unset = {
> >  	KUIDT_INIT(~0),
> >  };
> >  
> > +bool fib_rule_matchall(const struct fib_rule *rule)
> > +{
> > +	if (rule->iifindex || rule->oifindex || rule->mark || rule->l3mdev ||
> 
> l3mdev should not be in that list. Setting l3mdev is functionally
> equivalent to setting rule->table. The difference is that l3mdev means
> go get the table from the device. It has no bearing on a 'matchall' intent.

Good idea. Will drop this and the last patch.

> 
> 
> > +	    rule->tun_id || rule->flags)
> > +		return false;
> > +	if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1)
> > +		return false;
> > +	if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) ||
> > +	    !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end))
> > +		return false;
> > +	return true;
> > +}
> > +EXPORT_SYMBOL_GPL(fib_rule_matchall);
> > +
> >  int fib_default_rule_add(struct fib_rules_ops *ops,
> >  			 u32 pref, u32 table, u32 flags)
> >  {
> > diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
> > index 2892109..7a941a5 100644
> > --- a/net/ipv4/fib_rules.c
> > +++ b/net/ipv4/fib_rules.c
> > @@ -47,6 +47,16 @@ struct fib4_rule {
> >  #endif
> >  };
> >  
> > +bool fib4_rule_matchall(const struct fib_rule *rule)
> > +{
> > +	struct fib4_rule *r = (struct fib4_rule *) rule;
> 
> Use container_of instead of typecast.

There are multiple conversions from 'fib_rule' to 'fib4_rule' in this
file, all use typecast.

Thanks David.