[PATCH net-next v2 1/4] selftests: net: Move some UAPI header inclusions after libc ones

From: Thomas Weißschuh <hidden>
Date: 2026-01-20 14:10:41
Also in: bpf, linux-api, linux-kselftest, linux-security-module, lkml, mptcp
Reply to: Thomas Weißschuh, 2026-01-20

Interleaving inclusions of UAPI headers and libc headers is problematic.
Both sets of headers define conflicting symbols. To enable their
coexistence a compatibility-mechanism is in place.

An upcoming change will define 'struct sockaddr' from linux/socket.h.
However sys/socket.h from libc does not yet handle this case and a
symbol conflict will arise.

Furthermore libc-compat.h evaluates the state of the libc
inclusions only once, at the point it is included first. If another
problematic header from libc is included later, symbol conflicts arise.
This will trigger other duplicate definitions when linux/libc-compat.h
is added to linux/socket.h

Move the inclusion of UAPI headers after the inclusion of the glibc
ones, so the libc-compat.h continues to work correctly.

Signed-off-by: Thomas Weißschuh <redacted>
---
 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 +++--
 7 files changed, 26 insertions(+), 21 deletions(-)

diff --git a/tools/testing/selftests/net/af_unix/diag_uid.c b/tools/testing/selftests/net/af_unix/diag_uid.c
index da7d50cedee6..05456a205325 100644
--- a/tools/testing/selftests/net/af_unix/diag_uid.c
+++ b/tools/testing/selftests/net/af_unix/diag_uid.c

@@ -5,15 +5,16 @@
 #include <sched.h>
 
 #include <unistd.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-#include <linux/sock_diag.h>
-#include <linux/unix_diag.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/un.h>
 
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/sock_diag.h>
+#include <linux/unix_diag.h>
+
 #include "kselftest_harness.h"
 
 FIXTURE(diag_uid)

diff --git a/tools/testing/selftests/net/busy_poller.c b/tools/testing/selftests/net/busy_poller.c
index 3a81f9c94795..34bd8d28808a 100644
--- a/tools/testing/selftests/net/busy_poller.c
+++ b/tools/testing/selftests/net/busy_poller.c

@@ -9,7 +9,6 @@
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
-#include <ynl.h>
 
 #include <arpa/inet.h>
 #include <netinet/in.h>

@@ -19,6 +18,8 @@
 #include <sys/socket.h>
 #include <sys/types.h>
 
+#include <ynl.h>
+
 #include <linux/genetlink.h>
 #include <linux/netlink.h>

diff --git a/tools/testing/selftests/net/mptcp/mptcp_diag.c b/tools/testing/selftests/net/mptcp/mptcp_diag.c
index 8e0b1b8d84b6..af25ebfd2915 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_diag.c
+++ b/tools/testing/selftests/net/mptcp/mptcp_diag.c

@@ -1,11 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright (c) 2025, Kylin Software */
 
-#include <linux/sock_diag.h>
-#include <linux/rtnetlink.h>
-#include <linux/inet_diag.h>
-#include <linux/netlink.h>
-#include <linux/compiler.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <linux/tcp.h>

@@ -17,6 +12,12 @@
 #include <errno.h>
 #include <stdio.h>
 
+#include <linux/sock_diag.h>
+#include <linux/rtnetlink.h>
+#include <linux/inet_diag.h>
+#include <linux/netlink.h>
+#include <linux/compiler.h>
+
 #ifndef IPPROTO_MPTCP
 #define IPPROTO_MPTCP 262
 #endif

diff --git a/tools/testing/selftests/net/nettest.c b/tools/testing/selftests/net/nettest.c
index 1f5227f3d64d..71430403b50b 100644
--- a/tools/testing/selftests/net/nettest.c
+++ b/tools/testing/selftests/net/nettest.c

@@ -10,8 +10,6 @@
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <sys/wait.h>
-#include <linux/tcp.h>
-#include <linux/udp.h>
 #include <arpa/inet.h>
 #include <net/if.h>
 #include <netinet/in.h>

@@ -30,6 +28,8 @@
 #include <errno.h>
 #include <getopt.h>
 
+#include <linux/tcp.h>
+#include <linux/udp.h>
 #include <linux/xfrm.h>
 #include <linux/ipsec.h>
 #include <linux/pfkeyv2.h>

diff --git a/tools/testing/selftests/net/tcp_ao/icmps-discard.c b/tools/testing/selftests/net/tcp_ao/icmps-discard.c
index 85c1a1e958c6..451ba89914c9 100644
--- a/tools/testing/selftests/net/tcp_ao/icmps-discard.c
+++ b/tools/testing/selftests/net/tcp_ao/icmps-discard.c

@@ -16,12 +16,12 @@
  * Author: Dmitry Safonov <dima@arista.com>
  */
 #include <inttypes.h>
-#include <linux/icmp.h>
-#include <linux/icmpv6.h>
-#include <linux/ipv6.h>
 #include <netinet/in.h>
 #include <netinet/ip.h>
 #include <sys/socket.h>
+#include <linux/icmp.h>
+#include <linux/icmpv6.h>
+#include <linux/ipv6.h>
 #include "aolib.h"
 #include "../../../../include/linux/compiler.h"

diff --git a/tools/testing/selftests/net/tcp_ao/lib/netlink.c b/tools/testing/selftests/net/tcp_ao/lib/netlink.c
index 7f108493a29a..69a05820782a 100644
--- a/tools/testing/selftests/net/tcp_ao/lib/netlink.c
+++ b/tools/testing/selftests/net/tcp_ao/lib/netlink.c

@@ -1,14 +1,15 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Original from tools/testing/selftests/net/ipsec.c */
-#include <linux/netlink.h>
-#include <linux/random.h>
-#include <linux/rtnetlink.h>
-#include <linux/veth.h>
 #include <net/if.h>
 #include <stdint.h>
 #include <string.h>
 #include <sys/socket.h>
 
+#include <linux/netlink.h>
+#include <linux/random.h>
+#include <linux/rtnetlink.h>
+#include <linux/veth.h>
+
 #include "aolib.h"
 
 #define MAX_PAYLOAD		2048

diff --git a/tools/testing/selftests/net/tun.c b/tools/testing/selftests/net/tun.c
index 0efc67b0357a..e6e4c52d538e 100644
--- a/tools/testing/selftests/net/tun.c
+++ b/tools/testing/selftests/net/tun.c

@@ -8,12 +8,13 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+
 #include <linux/if.h>
 #include <linux/if_tun.h>
 #include <linux/netlink.h>
 #include <linux/rtnetlink.h>
-#include <sys/ioctl.h>
-#include <sys/socket.h>
 
 #include "kselftest_harness.h"

-- 
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