netdev - Re: [RFC 2/5] netlink: set extack error message in nla

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Date:   Tue, 18 Sep 2018 19:36:57 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     David Ahern <dsahern@...il.com>, netdev@...r.kernel.org
Subject: Re: [RFC 2/5] netlink: set extack error message in nla_validate()

On Tue, 2018-09-18 at 10:18 -0700, David Ahern wrote:
> On 9/18/18 6:12 AM, Johannes Berg wrote:
> > diff --git a/lib/nlattr.c b/lib/nlattr.c
> > index 120ad569e13d..efbd6c1aff29 100644
> > --- a/lib/nlattr.c
> > +++ b/lib/nlattr.c
> > @@ -181,9 +181,13 @@ int nla_validate(const struct nlattr *head, int len, int maxtype,
> >  	int rem;
> >  
> >  	nla_for_each_attr(nla, head, len, rem) {
> > -		int err = validate_nla(nla, maxtype, policy, NULL);
> > +		static const char _msg[] = "Attribute failed policy validation";
> > +		const char *msg = _msg;
> > +		int err = validate_nla(nla, maxtype, policy, &msg);
> >  
> >  		if (err < 0) {
> > +			if (extack)
> > +				extack->_msg = msg;
> >  			NL_SET_BAD_ATTR(extack, nla);
> >  			return err;
> >  		}
> > 
> 
> I take it this set is on top of another set - the NLA_REJECT?

Yeah, these two:

https://patchwork.ozlabs.org/project/netdev/list/?series=65982

johannes