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smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qaOG4kx/; 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="qaOG4kx/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3D807C4CEED; Thu, 21 Aug 2025 08:55:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755766535; bh=0j56qtVM1KDCgWYeMP865w/A8yzjyoXgwi+eP5xbJyM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qaOG4kx/q1LDqct4Tpz27yqsXHszPZdWGb5qKUKMgQoWSzUaBMAFbx3MIRe3bpHWS bcAk0ut2yghYCHstQ6HSGISP9I4+Www0t5UOZN6W9eSrAkqQHiilDLWvGWJao7LSl9 h/I7pIufkrD1juHVlSiIZHXakd7aGSMDzzoiiTX/L6BGVJU1tP1rJyBJPXwt5AYKJa XtRk3dVY6Lu4ZxDWTsbqGf2vN5y4t0XZNee0DAJ17OTOGuuT1vmo4OD4P25vmJP7GI CTFkpZofBdZraRrI1u8A3tis5al1p81GaKx1JBwswT6v3kckkU4IC4TuiPyEDksC33 HoGWh1HSsrFlQ== From: Geliang Tang To: mptcp@lists.linux.dev Cc: Geliang Tang Subject: [PATCH mptcp-next v2 05/10] selftests: mptcp: sockopt: add SO_BINDTOIFINDEX test Date: Thu, 21 Aug 2025 16:54:53 +0800 Message-ID: <91ec59691a0dae607baa6f6260643b1617483c6c.1755680616.git.tanggeliang@kylinos.cn> 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 Implement tests for the SO_BINDTOIFINDEX socket option: - Uses ioctl to get the loopback interface index - Sets the option to bind to "lo" - Validates the bound index via getsockopt - Supports both IPv4 and IPv6 Signed-off-by: Geliang Tang --- .../selftests/net/mptcp/mptcp_sockopt.c | 41 +++++++++++++++++++ .../selftests/net/mptcp/mptcp_sockopt.sh | 4 +- 2 files changed, 43 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 df4f85f129f7..25456e540cad 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c +++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c @@ -20,6 +20,7 @@ #include #include #include +#include =20 #include #include @@ -208,11 +209,36 @@ static void do_setsockopt_bindtodevice(int fd) perror("setsockopt(SO_BINDTODEVICE)"); } =20 +static int get_ifindex(int fd, const char *ifname) +{ + struct ifreq ifr; + + memset(&ifr, 0, sizeof(ifr)); + strncpy(ifr.ifr_name, ifname, IFNAMSIZ); + + if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) { + perror("ioctl"); + return -1; + } + + return ifr.ifr_ifindex; +} + +static void do_setsockopt_bindtoifindex(int fd) +{ + int ifindex =3D get_ifindex(fd, "lo"); + + if (setsockopt(fd, SOL_SOCKET, SO_BINDTOIFINDEX, + &ifindex, sizeof(ifindex))) + perror("setsockopt(SO_BINDTOIFINDEX)"); +} + static void do_setsockopts(int fd) { do_setsockopt_reuseaddr(fd); do_setsockopt_reuseport(fd); do_setsockopt_bindtodevice(fd); + do_setsockopt_bindtoifindex(fd); } =20 static int sock_listen_mptcp(const char * const listenaddr, @@ -622,6 +648,19 @@ static void do_getsockopt_bindtodevice(int fd) assert(!memcmp(ifname, "lo", len)); } =20 +static void do_getsockopt_bindtoifindex(int fd) +{ + socklen_t len; + int ifindex; + + len =3D sizeof(ifindex); + if (getsockopt(fd, SOL_SOCKET, SO_BINDTOIFINDEX, + &ifindex, &len)) + die_perror("getsockopt(SO_BINDTOIFINDEX)"); + + assert(ifindex =3D=3D get_ifindex(fd, "lo")); +} + static void do_getsockopts(struct so_state *s, int fd, size_t r, size_t w) { do_getsockopt_mptcp_info(s, fd, w); @@ -638,6 +677,8 @@ static void do_getsockopts(struct so_state *s, int fd, = size_t r, size_t w) do_getsockopt_reuseport(fd); =20 do_getsockopt_bindtodevice(fd); + + do_getsockopt_bindtoifindex(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 44342ce6fd16..7f2effd82af8 100755 --- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh +++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh @@ -271,7 +271,7 @@ do_mptcp_sockopt_tests() =20 for opt in "SOL_MPTCP" \ "SO_REUSEADDR" "SO_REUSEPORT" \ - "SO_BINDTODEVICE"; do + "SO_BINDTODEVICE" "SO_BINDTOIFINDEX"; do print_title "$opt sockopt v4" mptcp_lib_pr_ok mptcp_lib_result_pass "$opt sockopt v4" @@ -290,7 +290,7 @@ do_mptcp_sockopt_tests() =20 for opt in "SOL_MPTCP" \ "SO_REUSEADDR" "SO_REUSEPORT" \ - "SO_BINDTODEVICE"; do + "SO_BINDTODEVICE" "SO_BINDTOIFINDEX"; do print_title "$opt sockopt v6" mptcp_lib_pr_ok mptcp_lib_result_pass "$opt sockopt v6" --=20 2.48.1