Re: [PATCH v2 21/25] tcp: authopt: Add initial l3index support

[Leonard Crestez <cdleonard@xxxxxxxxx>]

On 11/3/21 5:06 AM, David Ahern wrote:
> On 11/1/21 10:34 AM, Leonard Crestez wrote:
> > @@ -584,10 +614,24 @@ int tcp_set_authopt_key(struct sock *sk, sockptr_t optval, unsigned int optlen)
> >   		return -EINVAL;
> >   	err = tcp_authopt_alg_require(alg);
> >   	if (err)
> >   		return err;
> >   
> > +	/* check ifindex is valid (zero is always valid) */
> > +	if (opt.flags & TCP_AUTHOPT_KEY_IFINDEX && opt.ifindex) {
> > +		struct net_device *dev;
> > +
> > +		rcu_read_lock();
> > +		dev = dev_get_by_index_rcu(sock_net(sk), opt.ifindex);
> > +		if (dev && netif_is_l3_master(dev))
> > +			l3index = dev->ifindex;
> > +		rcu_read_unlock();
>
> rcu_read_lock()... rcu_read_unlock() can be replaced with
> netif_index_is_l3_master(...)

Yes, this makes the code shorter.