[PATCH] ip.7: Add not supported by SOCK_STREAM to socket options

[PATCH] ip.7: Add not supported by SOCK_STREAM to socket options

[Oliver Crumrine]

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@gmail.com>
---
 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

Re: [PATCH] ip.7: Add not supported by SOCK_STREAM to socket options

[Alejandro Colomar]

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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@gmail.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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