diff --git a/testing/mptcpd/0001-include-define-__bswap_constant_-16-32-if-needed.patch b/testing/mptcpd/0001-include-define-__bswap_constant_-16-32-if-needed.patch
new file mode 100644
index 0000000000000000000000000000000000000000..c14b31fec0cb82f28a7ec0cf55d5c92620f7b183
--- /dev/null
+++ b/testing/mptcpd/0001-include-define-__bswap_constant_-16-32-if-needed.patch
@@ -0,0 +1,40 @@
+From 9c964d03a9c857a2d3b67be2619e0cc3d3eba8e5 Mon Sep 17 00:00:00 2001
+From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
+Date: Wed, 20 Nov 2024 12:20:07 +0100
+Subject: [PATCH 1/4] include: define __bswap_constant_{16,32} if needed
+
+Some libc like musl don't support them.
+
+Let's simply define them if they are not defined.
+
+From GNU C Library, bits/byteswap.h, under LGPL.
+
+Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
+---
+ include/mptcpd/private/sockaddr.h | 10 ++++++++++
+ 1 file changed, 10 insertions(+)
+
+diff --git a/include/mptcpd/private/sockaddr.h b/include/mptcpd/private/sockaddr.h
+index 1b8de34..5d74ef8 100644
+--- a/include/mptcpd/private/sockaddr.h
++++ b/include/mptcpd/private/sockaddr.h
+@@ -26,6 +26,16 @@
+ */
+ ///@{
+ #if __BYTE_ORDER == __LITTLE_ENDIAN
++/* These 2 helpers come from GNU C Library, under LGPL */
++# ifndef __bswap_constant_16
++# define __bswap_constant_16(x) \
++ ((__uint16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))
++# endif
++# ifndef __bswap_constant_32
++# define __bswap_constant_32(x) \
++ ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) \
++ | (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))
++# endif
+ # define MPTCPD_CONSTANT_HTONS(hs) __bswap_constant_16(hs)
+ # define MPTCPD_CONSTANT_HTONL(hl) __bswap_constant_32(hl)
+ #else
+--
+2.45.2
+
diff --git a/testing/mptcpd/0002-mptcpize-define-error-if-not-available.patch b/testing/mptcpd/0002-mptcpize-define-error-if-not-available.patch
new file mode 100644
index 0000000000000000000000000000000000000000..2c03a4ab4383c73e7f490e02153fa2f70c33b304
--- /dev/null
+++ b/testing/mptcpd/0002-mptcpize-define-error-if-not-available.patch
@@ -0,0 +1,78 @@
+From 3030c1258ba1c39ced94b88958c12486be5f6c41 Mon Sep 17 00:00:00 2001
+From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
+Date: Wed, 20 Nov 2024 12:52:27 +0100
+Subject: [PATCH 2/4] mptcpize: define error() if not available
+
+Some libc like musl don't support it.
+
+It is easy enough to define a simple version for our need.
+
+Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
+---
+ configure.ac | 5 +++++
+ src/mptcpize.c | 19 ++++++++++++++++++-
+ 2 files changed, 23 insertions(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index e1bc1ff..fd0e321 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -273,6 +273,11 @@ AC_CHECK_FUNC([l_netlink_message_new_sized],
+ [ELL has l_netlink_message_new_sized()])])
+ LIBS=$mptcpd_save_libs
+
++# ---------------------------------------------------------------
++# Checks for header files.
++# ---------------------------------------------------------------
++AC_CHECK_HEADERS([error.h])
++
+ # ---------------------------------------------------------------
+ # Enable additional C compiler warnings. We do this after all
+ # Autoconf tests have been run since not all autoconf macros are
+diff --git a/src/mptcpize.c b/src/mptcpize.c
+index b502d75..e944729 100644
+--- a/src/mptcpize.c
++++ b/src/mptcpize.c
+@@ -18,7 +18,6 @@
+ #include <argp.h>
+ #include <dlfcn.h>
+ #include <errno.h>
+-#include <error.h>
+ #include <fcntl.h>
+ #include <stdio.h>
+ #include <stdlib.h>
+@@ -29,6 +28,10 @@
+ # include <mptcpd/private/config.h>
+ #endif
+
++#ifdef HAVE_ERROR_H
++# include <error.h>
++#endif
++
+ #define SYSTEMD_ENV_VAR "Environment="
+ #define SYSTEMD_UNIT_VAR "FragmentPath="
+ #define SYSTEMD_SERVICE_TAG "[Service]"
+@@ -53,6 +56,20 @@ static char doc[] =
+ "\tdisable <unit> Update the systemd <unit>, removing\n"
+ "\t the above launcher.\n";
+
++#ifndef HAVE_ERROR_H
++# define ERROR_HELPER(status, errnum, format, ...) do { \
++ if (errnum) { \
++ errno = errnum; \
++ perror(format); \
++ } else { \
++ fprintf(stderr, format "%s", __VA_ARGS__); \
++ } \
++ if (status) \
++ exit(status); \
++ } while(0)
++# define error(...) ERROR_HELPER(__VA_ARGS__, "\n")
++#endif
++
+ static struct argp const argp = { 0, 0, args_doc, doc, 0, 0, 0 };
+
+ static void help(void)
+--
+2.45.2
+
diff --git a/testing/mptcpd/0003-config-special-case-for-default-logger.patch b/testing/mptcpd/0003-config-special-case-for-default-logger.patch
new file mode 100644
index 0000000000000000000000000000000000000000..55264e51b162b9b295cda7b5c270fd9096dc5085
--- /dev/null
+++ b/testing/mptcpd/0003-config-special-case-for-default-logger.patch
@@ -0,0 +1,78 @@
+From b92bb60a032689af9fcc61f015113d873f21dabf Mon Sep 17 00:00:00 2001
+From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
+Date: Wed, 20 Nov 2024 13:04:49 +0100
+Subject: [PATCH 3/4] config: special case for default logger
+
+The current version taking an unlimited number of args, and with
+multiple levels of helpers doesn't seem to be supported on some embedded
+environments, e.g. Alpine Linux:
+
+ configuration.c: In function 'mptcpd_config_create':
+ configuration.c:54:47: error: pasting "l_log_set_" and "(" does not give a valid preprocessing token
+ 54 | #define MPTCPD_SET_LOG_FUNCTION MPTCPD_CONCAT(l_log_set_, MPTCPD_LOGGER)
+ | ^~~~~~~~~~
+ configuration.c:42:36: note: in definition of macro 'MPTCPD_CONCAT_IMPL'
+ 42 | #define MPTCPD_CONCAT_IMPL(x, ...) x ## __VA_ARGS__
+ | ^
+ configuration.c:54:33: note: in expansion of macro 'MPTCPD_CONCAT'
+ 54 | #define MPTCPD_SET_LOG_FUNCTION MPTCPD_CONCAT(l_log_set_, MPTCPD_LOGGER)
+ | ^~~~~~~~~~~~~
+ configuration.c:802:9: note: in expansion of macro 'MPTCPD_SET_LOG_FUNCTION'
+ 802 | MPTCPD_SET_LOG_FUNCTION(); // For early logging.
+ | ^~~~~~~~~~~~~~~~~~~~~~~
+ configuration.c:54:47: error: implicit declaration of function 'l_log_set_'; did you mean 'l_log_set_null'? [-Werror=implicit-function-declaration]
+ 54 | #define MPTCPD_SET_LOG_FUNCTION MPTCPD_CONCAT(l_log_set_, MPTCPD_LOGGER)
+ | ^~~~~~~~~~
+ configuration.c:42:36: note: in definition of macro 'MPTCPD_CONCAT_IMPL'
+ 42 | #define MPTCPD_CONCAT_IMPL(x, ...) x ## __VA_ARGS__
+ | ^
+ configuration.c:54:33: note: in expansion of macro 'MPTCPD_CONCAT'
+ 54 | #define MPTCPD_SET_LOG_FUNCTION MPTCPD_CONCAT(l_log_set_, MPTCPD_LOGGER)
+ | ^~~~~~~~~~~~~
+ configuration.c:802:9: note: in expansion of macro 'MPTCPD_SET_LOG_FUNCTION'
+ 802 | MPTCPD_SET_LOG_FUNCTION(); // For early logging.
+ | ^~~~~~~~~~~~~~~~~~~~~~~
+ configuration.c:54:47: error: called object is not a function or function pointer
+ 54 | #define MPTCPD_SET_LOG_FUNCTION MPTCPD_CONCAT(l_log_set_, MPTCPD_LOGGER)
+ | ^~~~~~~~~~
+ configuration.c:42:36: note: in definition of macro 'MPTCPD_CONCAT_IMPL'
+ 42 | #define MPTCPD_CONCAT_IMPL(x, ...) x ## __VA_ARGS__
+ | ^
+ configuration.c:54:33: note: in expansion of macro 'MPTCPD_CONCAT'
+ 54 | #define MPTCPD_SET_LOG_FUNCTION MPTCPD_CONCAT(l_log_set_, MPTCPD_LOGGER)
+ | ^~~~~~~~~~~~~
+ configuration.c:802:9: note: in expansion of macro 'MPTCPD_SET_LOG_FUNCTION'
+ 802 | MPTCPD_SET_LOG_FUNCTION(); // For early logging.
+ | ^~~~~~~~~~~~~~~~~~~~~~~
+
+It is not clear to me why it is failing, and simplifying the
+concatenation to two items, plus modifying the main helper to take the
+prefix in argument don't seem to help . A simple workaround is to have a
+special case for the default value, and do the concatenation only with
+the other cases.
+
+Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
+---
+ src/configuration.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/configuration.c b/src/configuration.c
+index e78c8b5..8dcd3dd 100644
+--- a/src/configuration.c
++++ b/src/configuration.c
+@@ -50,8 +50,12 @@
+ // This should never occur!
+ # error Problem configuring default log message destination.
+ #endif
++#if MPTCPD_LOGGER == stderr
++#define MPTCPD_SET_LOG_FUNCTION l_log_set_stderr
++#else
+ /// Name of the default logging function determined at compile-time.
+ #define MPTCPD_SET_LOG_FUNCTION MPTCPD_CONCAT(l_log_set_, MPTCPD_LOGGER)
++#endif
+
+ /**
+ * @brief Get the function that sets the log message destination.
+--
+2.45.2
+
diff --git a/testing/mptcpd/0004-scripts-use-short-stat-options.patch b/testing/mptcpd/0004-scripts-use-short-stat-options.patch
new file mode 100644
index 0000000000000000000000000000000000000000..833669b272279b9bc83b5d2b4ea24d04fc14238e
--- /dev/null
+++ b/testing/mptcpd/0004-scripts-use-short-stat-options.patch
@@ -0,0 +1,32 @@
+From 4ead8e2461ba0b86ff699149b624b35a46919f07 Mon Sep 17 00:00:00 2001
+From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
+Date: Wed, 20 Nov 2024 15:20:28 +0100
+Subject: [PATCH 4/4] scripts: use short stat options
+
+Busybox's stat doesn't understand the long options:
+
+ stat: unrecognized option: dereference
+
+But it does support '-L'.
+
+Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
+---
+ scripts/check-permissions | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/scripts/check-permissions b/scripts/check-permissions
+index 879661b..a8dfedb 100755
+--- a/scripts/check-permissions
++++ b/scripts/check-permissions
+@@ -19,7 +19,7 @@ exit_status=0
+
+ for p in $@; do
+ # Access rights in human readable form (e.g. "drwxrwxr-x")
+- perms=`stat --dereference --format=%A $p`
++ perms=`stat -L -c %A $p`
+
+ # The write mode for "others".
+ other_write=`echo $perms | sed -e 's/.*\(.\).$/\1/'`
+--
+2.45.2
+
diff --git a/testing/mptcpd/APKBUILD b/testing/mptcpd/APKBUILD
new file mode 100644
index 0000000000000000000000000000000000000000..0ac5760f89d9af462825570c70ba2c2b984ef65e
--- /dev/null
+++ b/testing/mptcpd/APKBUILD
@@ -0,0 +1,96 @@
+# Contributor: Matthieu Baerts (NGI0) <matttbe@kernel.org>
+# Maintainer: Matthieu Baerts (NGI0) <matttbe@kernel.org>
+pkgname=mptcpd
+pkgver=0.13
+pkgrel=0
+pkgdesc="Multipath TCP Daemon"
+url="https://mptcpd.mptcp.dev"
+arch="all"
+license="BSD-3-Clause"
+depends="ell"
+makedepends="ell-dev argp-standalone linux-headers automake autoconf-archive libtool"
+options="!check" # the tests require the libc
+subpackages="
+ $pkgname-dbg
+ $pkgname-dev
+ $pkgname-doc
+ $pkgname-openrc
+ mptcpize
+ mptcpize-dbg:mptcpize_dbg
+ mptcpize-doc:mptcpize_doc:noarch
+ mptcp-get-debug:mptcp_get_debug
+ "
+source="https://github.com/multipath-tcp/mptcpd/releases/download/v$pkgver/mptcpd-$pkgver.tar.gz
+ 0001-include-define-__bswap_constant_-16-32-if-needed.patch
+ 0002-mptcpize-define-error-if-not-available.patch
+ 0003-config-special-case-for-default-logger.patch
+ 0004-scripts-use-short-stat-options.patch
+ mptcpd.initd
+ mptcpd.confd
+ "
+
+build() {
+ # can be removed when 0002-mptcpize-define-error-if-not-available.patch
+ # is dropped, same for 'automake', 'autoconf-archive' and 'libtool' deps
+ autoreconf --install --symlink --force
+
+ ./configure \
+ --build=$CBUILD \
+ --host=$CHOST \
+ --prefix=/usr \
+ --sysconfdir=/etc \
+ --mandir=/usr/share/man \
+ --localstatedir=/var \
+ --with-kernel=upstream
+ make
+}
+
+package() {
+ make DESTDIR="$pkgdir" install
+
+ install -m755 -D "$srcdir"/$pkgname.initd "$pkgdir"/etc/init.d/$pkgname
+ install -m644 -D "$srcdir"/$pkgname.confd "$pkgdir"/etc/conf.d/$pkgname
+}
+
+mptcpize() {
+ pkgdesc="Force apps to use MPTCP instead of TCP"
+ amove usr/bin/mptcpize
+ amove usr/lib/mptcpize
+}
+
+mptcpize_dbg() {
+ pkgdesc="Force apps to use MPTCP instead of TCP (dbg)"
+
+ mkdir -p "$subpkgdir"/usr/lib/debug/usr/bin/
+ mv -v "$pkgdir"-dbg/usr/lib/debug/usr/bin/mptcpize.debug \
+ "$subpkgdir"/usr/lib/debug/usr/bin/
+ mkdir -p "$subpkgdir"/usr/lib/debug/usr/lib/
+ mv -v "$pkgdir"-dbg/usr/lib/debug/usr/lib/mptcpize \
+ "$subpkgdir"/usr/lib/debug/usr/lib/
+}
+
+mptcpize_doc() {
+ pkgdesc="Force apps to use MPTCP instead of TCP (doc)"
+ depends=""
+
+ mkdir -p "$subpkgdir"/usr/share/man/man8/
+ mv -v "$pkgdir"-doc/usr/share/man/man8/mptcpize.8* \
+ "$subpkgdir"/usr/share/man/man8/
+}
+
+mptcp_get_debug() {
+ pkgdesc="MPTCP debug info script"
+ depends="iproute2"
+
+ amove usr/libexec/mptcp-get-debug
+}
+
+sha512sums="
+5dd53c9e1c92a3242ad84d93642116e77acb24c997219c98fe30a4c6d80b283de8878bcc84a6ac4eaf51ff6dd32cff5ed2a40a869c8304faa835f3b300dbca37 mptcpd-0.13.tar.gz
+e5d8f61dc2fd34abc1b6b97bac5129638ec0677c69e0cd4003d0e6e78468d1a8528e4f981972c84c116f4158694ba8e25ad3c1d3c8851484cafbb7a5e333fe2c 0001-include-define-__bswap_constant_-16-32-if-needed.patch
+15ae5d2149d82784b839e99e9be34dc8f3c9f04ff367e97f8eb36c2e0d210b1c0db653e7d3f920d621b20c95ea86604a8b77304333e698123252b7e5dda53262 0002-mptcpize-define-error-if-not-available.patch
+f881425ee08885be1246f36dea30ddef83292df1f6bdd5d6d3263fbe4479ed8d70854e26b4c97d5f4da5d3cb43f931194ca6b7ff818f5c6081dbec1e55cd0c53 0003-config-special-case-for-default-logger.patch
+4a9ae1f877d7f4bb463fd7659e25b2f52c233524c5643a9ba3b454d77a3ffdbaadc4aa344982168d8a66809f762fd9997b0ec365263cc49967f39bbab4943ee2 0004-scripts-use-short-stat-options.patch
+26fa76c4c613857d375f96d123314a45b802f2f2d91ef5f315e51600608213c9a7addeb48853f6693597f69dff506b493270031aa069cfd2c98aa9dbab435f41 mptcpd.initd
+c5c9542f8a1c0afe50c856436cf4415b6beb00066f1d5b7409a0ae5427257054f3e1432f6697142d97595a8b9e8c483f4cdafbc90a65e2e64adcce830108a48b mptcpd.confd
+"
diff --git a/testing/mptcpd/mptcpd.confd b/testing/mptcpd/mptcpd.confd
new file mode 100755
index 0000000000000000000000000000000000000000..726269524b1a98aca320ae812ce8b98949c58694
--- /dev/null
+++ b/testing/mptcpd/mptcpd.confd
@@ -0,0 +1,10 @@
+# Configuration for /etc/init.d/<SERVICE>
+
+# User (and group) to run <SERVICE> as.
+#command_user="<USER>"
+
+# Additional arguments for <SERVICE> daemon.
+#command_args=
+
+# Comment out to disable process supervisor.
+supervisor=supervise-daemon
diff --git a/testing/mptcpd/mptcpd.initd b/testing/mptcpd/mptcpd.initd
new file mode 100755
index 0000000000000000000000000000000000000000..1188b0037a1e576606c47443e627366f2a2d0f2c
--- /dev/null
+++ b/testing/mptcpd/mptcpd.initd
@@ -0,0 +1,21 @@
+#!/sbin/openrc-run
+
+name="MPTCP Daemon"
+description="MPTCP Daemon Service"
+
+: ${error_logger="logger -t mptcpd -p daemon.info >/dev/null 2>&1"}
+: ${start_wait=50} # milliseconds
+
+command="/usr/bin/mptcpd"
+command_args="$command_args"
+command_background="yes"
+start_stop_daemon_args="
+ ${start_wait:+--wait $start_wait}
+ ${start_stop_daemon_args:-}
+ "
+pidfile="/run/$RC_SVCNAME.pid"
+
+depend() {
+ need net
+ after firewall
+}