From nobody Wed Sep 17 19:40:14 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E034527FB2D for ; Fri, 8 Aug 2025 14:43:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754664231; cv=none; b=FW8HoUP4Cr5eEFG9LNxnNOV0riIwjBvw6pTBmOridX9Uv6juc7ypP/UYT9ibN4PAr47pefWRHj9JBxJ0PZpMuocChyH6X5JkAaBnVDlOs4QvOHhovaAgibr4eJEtE5IK2llYbGSYaUsXT8GONY08HVxSBMAvlv44Bn0EQ7PeCqM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754664231; c=relaxed/simple; bh=vPnu0/PvHSB1HAFqB+VcS7SCYWciLpt0wmtXOIoJrXc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XuifgANPn05srffY1UdF56dvcIGZDun38h+OvgeFfkZp7klT7ViXrIDafLMFAKAuYndBtK35BkmihuvsLvInpNRMfGnHHgK/HJm2RuSyZZOfA//lPdRoikhBO0A9fL9tY4tv8VRutHi9vmt4rELgYzKPkR6FQgyXdUTlVLYlMrk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XUsGYCO6; 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="XUsGYCO6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 95F6DC4CEF4; Fri, 8 Aug 2025 14:43:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754664230; bh=vPnu0/PvHSB1HAFqB+VcS7SCYWciLpt0wmtXOIoJrXc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XUsGYCO62QNKu+Y7KxQZBr0SpUgP6QV2601pyUvmzOtzmtG/538XdwQa3OzsUIeNJ fMRPtMvN/vS0S5cTLByBe2ZklTgjLJPBq5xaK2V6lRT5LAPnaIdylsiyW76ajsgLzU jLVhj1wYgNRj2dLHV8BRbjeeP2kzU2FaIoUbrizJwZHg3fb+O3WUu2rFqnwlNocPRz kRr5CuCYSE5Ta1xVxtgVDfNhg2pcXWe1Iifzbqt0aYqltHnJtMzNsVVlIbcOkE9a6D JDj3hj/TJSoO+DxmHNXagAohsO2TkHPHQZFQUvJ3LHg2edZsa6RP5F3B17SxUucg2Z iCIPTOnjr7qaw== From: Geliang Tang To: mptcp@lists.linux.dev Cc: Geliang Tang Subject: [PATCH mptcp-next v2 6/9] selftests: mptcp: sockopt: add TCP_INQ client processing Date: Fri, 8 Aug 2025 22:42:51 +0800 Message-ID: <84bf786dd175a375450941289c2c58c4d0bd24ca.1754664106.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 process_one_client_inq() to handle TCP_INQ-specific client logic including: - Setting TCP_INQ sockopt - Validating INQ values via cmsg - Handling large data transfers with INQ checks - Verifying FIN sequence INQ semantics These codes are from mptcp_inq.c. Signed-off-by: Geliang Tang --- .../selftests/net/mptcp/mptcp_sockopt.c | 153 +++++++++++++++++- 1 file changed, 152 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c b/tools/test= ing/selftests/net/mptcp/mptcp_sockopt.c index 79370df1d89d..0a85d7b3efe8 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c +++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c @@ -21,6 +21,7 @@ #include #include #include +#include =20 #include #include @@ -712,6 +713,153 @@ static void process_one_client(int fd, int pipefd) close(fd); } =20 +static void get_tcp_inq(struct msghdr *msgh, unsigned int *inqv) +{ + struct cmsghdr *cmsg; + + for (cmsg =3D CMSG_FIRSTHDR(msgh); cmsg ; cmsg =3D CMSG_NXTHDR(msgh, cmsg= )) { + if (cmsg->cmsg_level =3D=3D IPPROTO_TCP && cmsg->cmsg_type =3D=3D TCP_CM= _INQ) { + memcpy(inqv, CMSG_DATA(cmsg), sizeof(*inqv)); + return; + } + } + + xerror("could not find TCP_CM_INQ cmsg type"); +} + +static void process_one_client_inq(int fd, int unixfd) +{ + unsigned int tcp_inq; + size_t expect_len; + char msg_buf[4096]; + char buf[4096]; + char tmp[16]; + struct iovec iov =3D { + .iov_base =3D buf, + .iov_len =3D 1, + }; + struct msghdr msg =3D { + .msg_iov =3D &iov, + .msg_iovlen =3D 1, + .msg_control =3D msg_buf, + .msg_controllen =3D sizeof(msg_buf), + }; + ssize_t ret, tot; + + ret =3D write(unixfd, "xmit", 4); + assert(ret =3D=3D 4); + + ret =3D read(unixfd, &expect_len, sizeof(expect_len)); + assert(ret =3D=3D (ssize_t)sizeof(expect_len)); + + if (expect_len > sizeof(buf)) + xerror("expect len %zu exceeds buffer size", expect_len); + + for (;;) { + struct timespec req; + unsigned int queued; + + ret =3D ioctl(fd, FIONREAD, &queued); + if (ret < 0) + die_perror("FIONREAD"); + if (queued > expect_len) + xerror("FIONREAD returned %u, but only %zu expected\n", + queued, expect_len); + if (queued =3D=3D expect_len) + break; + + req.tv_sec =3D 0; + req.tv_nsec =3D 1000 * 1000ul; + nanosleep(&req, NULL); + } + + /* read one byte, expect cmsg to return expected - 1 */ + ret =3D recvmsg(fd, &msg, 0); + if (ret < 0) + die_perror("recvmsg"); + + if (msg.msg_controllen =3D=3D 0) + xerror("msg_controllen is 0"); + + get_tcp_inq(&msg, &tcp_inq); + + assert((size_t)tcp_inq =3D=3D (expect_len - 1)); + + iov.iov_len =3D sizeof(buf); + ret =3D recvmsg(fd, &msg, 0); + if (ret < 0) + die_perror("recvmsg"); + + /* should have gotten exact remainder of all pending data */ + assert(ret =3D=3D (ssize_t)tcp_inq); + + /* should be 0, all drained */ + get_tcp_inq(&msg, &tcp_inq); + assert(tcp_inq =3D=3D 0); + + /* request a large swath of data. */ + ret =3D write(unixfd, "huge", 4); + assert(ret =3D=3D 4); + + ret =3D read(unixfd, &expect_len, sizeof(expect_len)); + assert(ret =3D=3D (ssize_t)sizeof(expect_len)); + + /* peer should send us a few mb of data */ + if (expect_len <=3D sizeof(buf)) + xerror("expect len %zu too small\n", expect_len); + + tot =3D 0; + do { + iov.iov_len =3D sizeof(buf); + ret =3D recvmsg(fd, &msg, 0); + if (ret < 0) + die_perror("recvmsg"); + + tot +=3D ret; + + get_tcp_inq(&msg, &tcp_inq); + + if (tcp_inq > expect_len - tot) + xerror("inq %d, remaining %d total_len %d\n", + tcp_inq, expect_len - tot, (int)expect_len); + + assert(tcp_inq <=3D expect_len - tot); + } while ((size_t)tot < expect_len); + + ret =3D write(unixfd, "shut", 4); + assert(ret =3D=3D 4); + + /* wait for hangup. Should have received one more byte of data. */ + ret =3D read(unixfd, tmp, sizeof(tmp)); + assert(ret =3D=3D 6); + assert(strncmp(tmp, "closed", 6) =3D=3D 0); + + sleep(1); + + iov.iov_len =3D 1; + ret =3D recvmsg(fd, &msg, 0); + if (ret < 0) + die_perror("recvmsg"); + assert(ret =3D=3D 1); + + get_tcp_inq(&msg, &tcp_inq); + + /* tcp_inq should be 1 due to received fin. */ + assert(tcp_inq =3D=3D 1); + + iov.iov_len =3D 1; + ret =3D recvmsg(fd, &msg, 0); + if (ret < 0) + die_perror("recvmsg"); + + /* expect EOF */ + assert(ret =3D=3D 0); + get_tcp_inq(&msg, &tcp_inq); + assert(tcp_inq =3D=3D 1); + + close(fd); +} + static void do_setsockopt_inq(int fd) { int on =3D 1; @@ -760,7 +908,10 @@ static int server(int ipcfd) alarm(15); r =3D xaccept(fd); =20 - process_one_client(r, ipcfd); + if (inq) + process_one_client_inq(r, ipcfd); + else + process_one_client(r, ipcfd); =20 return 0; } --=20 2.48.1