On Fri, Oct 16, 2020 at 1:42 AM Marcelo Ricardo Leitner
<marcelo.leitner@xxxxxxxxx> wrote:
>
> Actually..
>
> On Tue, Oct 13, 2020 at 03:27:41PM +0800, Xin Long wrote:
> ...
> > Also add sysctl udp_port to allow changing the listening
> > sock's port by users.
> ...
> > ---
> > net/sctp/protocol.c | 5 +++++
> > net/sctp/sysctl.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
> > 2 files changed, 55 insertions(+)
>
> Xin, sorry for not noticing this earlier, but we need a documentation
> update here for this new sysctl. This is important. Please add its
> entry in ip-sysctl.rst.
no problem, I will add it.
>
> >
> > diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
> > index be002b7..79fb4b5 100644
> > --- a/net/sctp/protocol.c
> > +++ b/net/sctp/protocol.c
> > @@ -1469,6 +1469,10 @@ static int __net_init sctp_ctrlsock_init(struct net *net)
> > if (status)
> > pr_err("Failed to initialize the SCTP control sock\n");
> >
> > + status = sctp_udp_sock_start(net);
> > + if (status)
> > + pr_err("Failed to initialize the SCTP udp tunneling sock\n");
> ^^^ upper case please.
> Nit. There are other occurrences of this.
You mean we can remove this log, as it's been handled well in
sctp_udp_sock_start()?
>
> > +
> > return status;
> ...
> > + ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
> > + if (write && ret == 0) {
> > + struct sock *sk = net->sctp.ctl_sock;
> > +
> > + if (new_value > max || new_value < min)
> > + return -EINVAL;
> > +
> > + net->sctp.udp_port = new_value;
> > + sctp_udp_sock_stop(net);
>
> So, if it would be disabling the encapsulation, it shouldn't be
> calling _start() then, right? Like
>
> if (new_value)
> ret = sctp_udp_sock_start(net);
>
> Otherwise _start() here will call ..._bind() with port 0, which then
> will be a random one.
right, somehow I thought it wouldn't bind with port 0.
Thanks.
>
> > + ret = sctp_udp_sock_start(net);
> > + if (ret)
> > + net->sctp.udp_port = 0;
> > +
> > + /* Update the value in the control socket */
> > + lock_sock(sk);
> > + sctp_sk(sk)->udp_port = htons(net->sctp.udp_port);
> > + release_sock(sk);
> > + }
> > +
> > + return ret;
> > +}
> > +
> > int sctp_sysctl_net_register(struct net *net)
> > {
> > struct ctl_table *table;
> > --
> > 2.1.0
> >
