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From: "Valentin Vidić" <vvidic@valentin-vidic.from.hr>
To: kernelnewbies@kernelnewbies.org
Subject: Re: Kernel TLS
Date: Fri, 29 Nov 2019 20:48:01 +0100
Message-ID: <20191129194801.GI20116@valentin-vidic.from.hr> (raw)
In-Reply-To: <CAH8yC8nZ=Ka5SLKnMWr7ukC4zFA8_Zi226UoKHUA4jZMY0LoNQ@mail.gmail.com>

On Fri, Nov 29, 2019 at 02:36:10PM -0500, Jeffrey Walton wrote:
> I'm trying to run through the example at
> https://www.kernel.org/doc/html/latest/networking/tls.html#kernel-tls
> .
> 
> I'm working on Fedora 31 x86_64 (fully patched). Running my program results in:
> 
>     $ ./ktls
>     setsockopt failed, 2, No such file or directory
> 
> I observed:
> 
>     $ cat /proc/sys/net/ipv4/tcp_available_ulp
>     $
> 
> Is there a way to enable ULP at boot? Or is this a kernel config
> option? Or maybe I am doing something else wrong?

strace gives me:

...
socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 3
setsockopt(3, SOL_TCP, TCP_ULP, [7564404], 4) = -1 ENOENT (No such file or directory)
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x2), ...}) = 0
brk(NULL)                               = 0x55d76b14e000
brk(0x55d76b16f000)                     = 0x55d76b16f000
write(1, "setsockopt failed, 2, No such fi"..., 48setsockopt failed, 2, No such file or directory
) = 48
exit_group(1)                           = ?
+++ exited with 1 +++

$ grep TLS /boot/config-4.19.0-6-amd64 
CONFIG_HAVE_COPY_THREAD_TLS=y
# CONFIG_TLS is not set
# CONFIG_VIDEO_IVTV_DEPRECATED_IOCTLS is not set

So you probably need to rebuild the kernel with CONFIG_TLS to get this working.

-- 
Valentin

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Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-29 19:36 Jeffrey Walton
2019-11-29 19:46 ` Alexander Mihalicyn
2019-11-29 19:48 ` Valentin Vidić [this message]
2019-11-29 19:57   ` Jeffrey Walton
2019-11-29 20:04     ` Jeffrey Walton
2019-11-30  4:37       ` Jeffrey Walton
2019-11-30  6:16         ` Alexander Mihalicyn
2019-11-30  6:40         ` Valdis Klētnieks
2019-11-30  8:13           ` Bjørn Mork
2019-11-30  9:11             ` Valdis Klētnieks
2019-11-30 10:10               ` Bjørn Mork
2019-11-30 10:34                 ` Valdis Klētnieks
2019-11-30 12:54                   ` [PATCH] net/tls: Fix return values for setsockopt Valentin Vidic
2019-11-30 13:15                     ` Jeffrey Walton
2019-11-30 13:31                       ` Valentin Vidić

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