linux-kernel - Re: [PATCH net-next v2 0/4] net: uapi: Provide an UAPI definition of 'struct sockaddr'

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Message-ID: <20260121192729.2095aa25@kernel.org>
Date: Wed, 21 Jan 2026 19:27:29 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Eric Dumazet <edumazet@...gle.com>, Kuniyuki Iwashima
 <kuniyu@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Willem de Bruijn
 <willemb@...gle.com>, "David S. Miller" <davem@...emloft.net>, Simon Horman
 <horms@...nel.org>, Shuah Khan <shuah@...nel.org>, Matthieu Baerts
 <matttbe@...nel.org>, Mat Martineau <martineau@...nel.org>, Geliang Tang
 <geliang@...nel.org>, Mickaël Salaün
 <mic@...ikod.net>, Günther Noack <gnoack@...gle.com>,
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, John
 Fastabend <john.fastabend@...il.com>, Stanislav Fomichev <sdf@...ichev.me>,
 Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau
 <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>, Song Liu
 <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, KP Singh
 <kpsingh@...nel.org>, Hao Luo <haoluo@...gle.com>, Jiri Olsa
 <jolsa@...nel.org>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-api@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
 linux-kselftest@...r.kernel.org, mptcp@...ts.linux.dev,
 linux-security-module@...r.kernel.org, bpf@...r.kernel.org,
 libc-alpha@...rceware.org, Carlos O'Donell <carlos@...hat.com>, Adhemerval
 Zanella <adhemerval.zanella@...aro.org>, Rich Felker <dalias@...c.org>,
 klibc@...or.com, Florian Weimer <fweimer@...hat.com>
Subject: Re: [PATCH net-next v2 0/4] net: uapi: Provide an UAPI definition
 of 'struct sockaddr'

On Tue, 20 Jan 2026 15:10:30 +0100 Thomas Weißschuh wrote:
> Various UAPI headers reference 'struct sockaddr'. Currently the
> definition of this struct is pulled in from the libc header
> sys/socket.h. This is problematic as it introduces a dependency
> on a full userspace toolchain.
> 
> Add a definition of 'struct sockaddr' to the UAPI headers.
> Before that, reorder some problematic header inclusions in the selftests.

>  include/linux/socket.h                             | 10 ----------
>  include/uapi/linux/if.h                            |  4 ----
>  include/uapi/linux/libc-compat.h                   | 12 ++++++++++++
>  include/uapi/linux/socket.h                        | 14 ++++++++++++++
>  samples/bpf/xdp_adjust_tail_user.c                 |  6 ++++--
>  samples/bpf/xdp_fwd_user.c                         |  7 ++++---
>  samples/bpf/xdp_router_ipv4_user.c                 |  6 +++---
>  samples/bpf/xdp_sample_user.c                      | 15 ++++++++-------
>  samples/bpf/xdp_tx_iptunnel_user.c                 |  4 ++--
>  tools/testing/selftests/landlock/audit.h           |  7 ++++---
>  tools/testing/selftests/net/af_unix/diag_uid.c     |  9 +++++----
>  tools/testing/selftests/net/busy_poller.c          |  3 ++-
>  tools/testing/selftests/net/mptcp/mptcp_diag.c     | 11 ++++++-----
>  tools/testing/selftests/net/nettest.c              |  4 ++--
>  tools/testing/selftests/net/tcp_ao/icmps-discard.c |  6 +++---
>  tools/testing/selftests/net/tcp_ao/lib/netlink.c   |  9 +++++----
>  tools/testing/selftests/net/tun.c                  |  5 +++--
>  17 files changed, 77 insertions(+), 55 deletions(-)

Are all those selftests / samples getting broken by this patch set?

I understand that we should avoid libc dependencies in uAPI but at
least speaking for networking - building selftests without libc is..
not a practical proposition?