netdev - Re: [PATCH net-next 4/8] sctp: add SCTP_ASCONF

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Date:   Mon, 19 Aug 2019 11:58:43 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        Neil Horman <nhorman@...driver.com>, davem@...emloft.net
Subject: Re: [PATCH net-next 4/8] sctp: add SCTP_ASCONF_SUPPORTED sockopt

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;
> +}