netdev - Re: [PATCH net-next 1/3] net-timestamp: add strict check when setting tx flags

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Message-ID: <66fa7fe46392e_17948d294bb@willemb.c.googlers.com.notmuch>
Date: Mon, 30 Sep 2024 06:39:32 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jason Xing <kerneljasonxing@...il.com>, 
 davem@...emloft.net, 
 edumazet@...gle.com, 
 kuba@...nel.org, 
 pabeni@...hat.com, 
 dsahern@...nel.org, 
 willemdebruijn.kernel@...il.com, 
 shuah@...nel.org, 
 willemb@...gle.com
Cc: linux-kselftest@...r.kernel.org, 
 netdev@...r.kernel.org, 
 Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH net-next 1/3] net-timestamp: add strict check when setting
 tx flags

Jason Xing wrote:
> From: Jason Xing <kernelxing@...cent.com>
> 
> Even though this case is unlikely to happen, we have to avoid such
> a case occurring at an earlier point: the sk_rmem_alloc could get
> increased because of inserting more and more skbs into the errqueue
> when calling __skb_complete_tx_timestamp(). This bad case would stop
> the socket transmitting soon.

It is up to the application to read from the error queue frequently
enough and/or increase SO_RCVBUF.
 
> Signed-off-by: Jason Xing <kernelxing@...cent.com>
> ---
>  net/core/sock.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/net/core/sock.c b/net/core/sock.c
> index fe87f9bd8f16..4bddd6f62e4f 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -905,6 +905,10 @@ int sock_set_timestamping(struct sock *sk, int optname,
>  	if (val & ~SOF_TIMESTAMPING_MASK)
>  		return -EINVAL;
>  
> +	if (val & SOF_TIMESTAMPING_TX_RECORD_MASK &&
> +	    !(val & SOF_TIMESTAMPING_SOFTWARE))
> +		return -EINVAL;
> +

This breaks hardware timestamping

>  	if (val & SOF_TIMESTAMPING_OPT_ID_TCP &&
>  	    !(val & SOF_TIMESTAMPING_OPT_ID))
>  		return -EINVAL;
> -- 
> 2.37.3
>