linux-kernel - Re: [PATCH] ip.7: Add not supported by SOCK

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Message-ID: <ZeXzuWVmC9AnsECt@debian>
Date: Mon, 4 Mar 2024 17:15:52 +0100
From: Alejandro Colomar <alx@...nel.org>
To: Oliver Crumrine <ozlinuxc@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-man@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] ip.7: Add not supported by SOCK_STREAM to socket options

Hi Oliver,

On Sat, Mar 02, 2024 at 01:19:42PM -0500, Oliver Crumrine wrote:
> It was not made clear in several socket options that they were not
> supported by SOCK_STREAM; this patch fixes that.
> 
> Socket options not supported by SOCK_STREAM are handled in the
> ip_cmsg_recv_offset function in net/ipv4/ip_sockglue.c. The function is
> called for udp sockets, and indirectly by ping and raw sockets, but not
> for TCP sockets, as they don't support these options.
> 
> Signed-off-by: Oliver Crumrine <ozlinuxc@...il.com>

Could you write some small example programs demonstrating that these are
not supported?  I'd like to check it with a small program, if possible.

Have a lovely say!
Alex

> ---
>  man7/ip.7 | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/man7/ip.7 b/man7/ip.7
> index 2b4b06324..104e65feb 100644
> --- a/man7/ip.7
> +++ b/man7/ip.7
> @@ -828,6 +828,9 @@ is not zero, the primary local address of the interface specified by the
>  index overwrites
>  .I ipi_spec_dst
>  for the routing table lookup.
> +Not supported for
> +.B SOCK_STREAM
> +sockets.
>  .TP
>  .BR IP_RECVERR " (since Linux 2.2)"
>  .\" Precisely: since Linux 2.1.15
> @@ -989,6 +992,9 @@ in which the kernel returns the original destination address
>  of the datagram being received.
>  The ancillary message contains a
>  .IR "struct sockaddr_in" .
> +Not supported for
> +.B SOCK_STREAM
> +sockets.
>  .TP
>  .BR IP_RECVTOS " (since Linux 2.2)"
>  .\" Precisely: since Linux 2.1.68
> @@ -998,6 +1004,9 @@ ancillary message is passed with incoming packets.
>  It contains a byte which specifies the Type of Service/Precedence
>  field of the packet header.
>  Expects a boolean integer flag.
> +Not supported for
> +.B SOCK_STREAM
> +sockets.
>  .TP
>  .BR IP_RECVTTL " (since Linux 2.2)"
>  .\" Precisely: since Linux 2.1.68
> -- 
> 2.44.0
> 

-- 
<https://www.alejandro-colomar.es/>
Looking for a remote C programming job at the moment.

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