netdev - Re: [RFC v2 net-next 01/10] net: Add a new socket option for a future transmit time.

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Message-ID: <20180118171122.3pnrws3o3dvh54u2@localhost>
Date:   Thu, 18 Jan 2018 09:11:22 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, vinicius.gomes@...el.com,
        intel-wired-lan@...ts.osuosl.org, anna-maria@...utronix.de,
        henrik@...tad.us, tglx@...utronix.de, john.stultz@...aro.org,
        andre.guedes@...el.com, ivan.briano@...el.com,
        levi.pearson@...man.com, Richard Cochran <rcochran@...utronix.de>
Subject: Re: [RFC v2 net-next 01/10] net: Add a new socket option for a
 future transmit time.

On Wed, Jan 17, 2018 at 03:06:12PM -0800, Jesus Sanchez-Palencia wrote:
> @@ -2130,6 +2137,15 @@ int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
>  		sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
>  		sockc->tsflags |= tsflags;
>  		break;
> +	case SO_TXTIME:
> +		if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
> +			return -EPERM;
> +		if (!sock_flag(sk, SOCK_TXTIME))
> +			return -EINVAL;
> +		if (cmsg->cmsg_len != CMSG_LEN(sizeof(ktime_t)))
> +			return -EINVAL;
> +		sockc->transmit_time = *(ktime_t *)CMSG_DATA(cmsg);

As pointed out in the first series' review:

  No guarantee the CMSG is properly aligned on arches that might trap
  on unaligned access.

Thanks,
Richard