Re: [PATCH net-next 4/8] sctp: add SCTP_ASCONF_SUPPORTED sockopt

[Marcelo Ricardo Leitner]

On Mon, Aug 19, 2019 at 10:02:46PM +0800, Xin Long wrote:
> +static int sctp_setsockopt_asconf_supported(struct sock *sk,
> +                                         char __user *optval,
> +                                         unsigned int optlen)
> +{
> +     struct sctp_assoc_value params;
> +     struct sctp_association *asoc;
> +     struct sctp_endpoint *ep;
> +     int retval = -EINVAL;
> +
> +     if (optlen != sizeof(params))
> +             goto out;
> +
> +     if (copy_from_user(&params, optval, optlen)) {
> +             retval = -EFAULT;
> +             goto out;
> +     }
> +
> +     asoc = sctp_id2assoc(sk, params.assoc_id);
> +     if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
> +         sctp_style(sk, UDP))
> +             goto out;
> +
> +     ep = sctp_sk(sk)->ep;
> +     ep->asconf_enable = !!params.assoc_value;

Considering this will be negotiated on handshake, shouldn't it deny
changes to Established asocs? (Same for Auth)

> +
> +     if (ep->asconf_enable && ep->auth_enable) {
> +             sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
> +             sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
> +     }
> +
> +     retval = 0;
> +
> +out:
> +     return retval;
> +}