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smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qt0LpSPO; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qt0LpSPO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A3A57C4CEEB; Thu, 21 Aug 2025 08:55:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755766533; bh=8Oa2j0c9SE1226y5Dsdgh9OiCdu8wEI23v3te89Oh1I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qt0LpSPOUaWtU62sjiav9LB96z3b5w4dA35X1lYazurA6G4XBzk8sON2fQT33/IXj MYOBya7V9OkDkM3Pvf/C+y55i2eNO2ngEZSKoMFz6NuMj3cNPoxD35oEAaT3Vh0aVU QqPhto/HTMcaPkjjtHGJ+2pIJtmxXtiHDdeEItdA++Dh7f7n9pnaogIan719PY6z5P u+D4CBRVHOKAYxKoJ1lzG0QCHYbJW5wxceJFZL0Nj4cktBjYR8E1CN6cw4UoqIPk4Q kUR9jK745P3/0/CnmPijoVTV5njiRyfBaXWSc/OLftZfK0jQ8WRYJWKB/KdY6paKRY Al7CXR/zXHqYQ== From: Geliang Tang To: mptcp@lists.linux.dev Cc: Geliang Tang Subject: [PATCH mptcp-next v2 04/10] selftests: mptcp: sockopt: add SO_BINDTODEVICE test Date: Thu, 21 Aug 2025 16:54:52 +0800 Message-ID: X-Mailer: git-send-email 2.48.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Geliang Tang Add tests for the SO_BINDTODEVICE socket option: - Binds sockets to the loopback device ("lo") - Verifies the binding via getsockopt - Includes IPv4 and IPv6 test cases - Reports results explicitly in the test script Signed-off-by: Geliang Tang --- .../selftests/net/mptcp/mptcp_sockopt.c | 25 +++++++++++++++++++ .../selftests/net/mptcp/mptcp_sockopt.sh | 6 +++-- 2 files changed, 29 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c b/tools/test= ing/selftests/net/mptcp/mptcp_sockopt.c index 816d71706f7d..df4f85f129f7 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c +++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c @@ -23,6 +23,7 @@ =20 #include #include +#include =20 #include =20 @@ -198,10 +199,20 @@ static void do_setsockopt_reuseport(int fd) perror("setsockopt(SO_REUSEPORT)"); } =20 +static void do_setsockopt_bindtodevice(int fd) +{ + const char *interface =3D "lo"; + + if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, + interface, strlen(interface))) + perror("setsockopt(SO_BINDTODEVICE)"); +} + static void do_setsockopts(int fd) { do_setsockopt_reuseaddr(fd); do_setsockopt_reuseport(fd); + do_setsockopt_bindtodevice(fd); } =20 static int sock_listen_mptcp(const char * const listenaddr, @@ -599,6 +610,18 @@ static void do_getsockopt_reuseport(int fd) assert(reuse =3D=3D 1); } =20 +static void do_getsockopt_bindtodevice(int fd) +{ + char ifname[IFNAMSIZ] =3D { 0 }; + socklen_t len; + + len =3D sizeof(ifname); + if (getsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifname, &len)) + die_perror("getsockopt(SO_BINDTODEVICE)"); + + assert(!memcmp(ifname, "lo", len)); +} + static void do_getsockopts(struct so_state *s, int fd, size_t r, size_t w) { do_getsockopt_mptcp_info(s, fd, w); @@ -613,6 +636,8 @@ static void do_getsockopts(struct so_state *s, int fd, = size_t r, size_t w) do_getsockopt_reuseaddr(fd); =20 do_getsockopt_reuseport(fd); + + do_getsockopt_bindtodevice(fd); } =20 static void connect_one_server(int fd, int pipefd) diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh b/tools/tes= ting/selftests/net/mptcp/mptcp_sockopt.sh index 1c357ed757d6..44342ce6fd16 100755 --- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh +++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh @@ -270,7 +270,8 @@ do_mptcp_sockopt_tests() fi =20 for opt in "SOL_MPTCP" \ - "SO_REUSEADDR" "SO_REUSEPORT"; do + "SO_REUSEADDR" "SO_REUSEPORT" \ + "SO_BINDTODEVICE"; do print_title "$opt sockopt v4" mptcp_lib_pr_ok mptcp_lib_result_pass "$opt sockopt v4" @@ -288,7 +289,8 @@ do_mptcp_sockopt_tests() fi =20 for opt in "SOL_MPTCP" \ - "SO_REUSEADDR" "SO_REUSEPORT"; do + "SO_REUSEADDR" "SO_REUSEPORT" \ + "SO_BINDTODEVICE"; do print_title "$opt sockopt v6" mptcp_lib_pr_ok mptcp_lib_result_pass "$opt sockopt v6" --=20 2.48.1