On Thu, Jul 23, 2020 at 12:30:25PM -0300, Marcelo Ricardo Leitner wrote:
> On Thu, Jul 23, 2020 at 11:22:38AM +0200, Christoph Hellwig wrote:
> > On Wed, Jul 22, 2020 at 05:42:31PM -0300, Marcelo Ricardo Leitner wrote:
> > > Cc'ing linux-sctp@xxxxxxxxxxxxxxx.
> >
> > What do you think of this version, which I think is a little cleaner?
>
> It splits up the argument parsing from the actual handling, ok. Looks
> good. Just one point:
>
> > +static int sctp_setsockopt_delayed_ack(struct sock *sk,
> > + struct sctp_sack_info *params,
> > + unsigned int optlen)
> > +{
> > + if (optlen == sizeof(struct sctp_assoc_value)) {
> > + struct sctp_sack_info p;
> > +
> > + pr_warn_ratelimited(DEPRECATED
> > + "%s (pid %d) "
> > + "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
> > + "Use struct sctp_sack_info instead\n",
> > + current->comm, task_pid_nr(current));
> > +
> > + memcpy(&p, params, sizeof(struct sctp_assoc_value));
> > + p.sack_freq = p.sack_delay ? 0 : 1;
>
> Please add a comment saying that sctp_sack_info.sack_delay maps
> exactly to sctp_assoc_value.assoc_value, so that's why we can do
> memcpy and read assoc_value as sack_delay. I think it will help us not
> trip on this again in the future.
Yeah. Actually I think I'll go all the way and kill the not very
obvious or type safe memcpy as well.
