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([177.194.59.218]) by smtp.gmail.com with ESMTPSA id y13sm14311299pgp.16.2021.07.05.11.30.39 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Jul 2021 11:30:40 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 6/7] socket: Add recvmsg timestamp test Date: Mon, 5 Jul 2021 15:30:26 -0300 Message-Id: <20210705183027.3804093-7-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210705183027.3804093-1-adhemerval.zanella@linaro.org> References: <20210705183027.3804093-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" The test check if SO_TIMESTAMP and SO_TIMESTAMPNS is correctly generated. The recvmsg() is called with different ancilliary data buffers, to check if the conversion for 64-bit time on 32-bit legacy ABIs are handled correctly. For such archicutures, depending of the remmaning ancially data space the timestamp can not be appended and MSG_TRUNC is returned instead. Checked on x86_64-linux and on i686-linux-gnu on both 5.11 and 4.15 kernel. --- sysdeps/unix/sysv/linux/Makefile | 3 + sysdeps/unix/sysv/linux/tst-recvmsg-time64.c | 1 + sysdeps/unix/sysv/linux/tst-recvmsg.c | 171 +++++++++++++++++++ 3 files changed, 175 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/tst-recvmsg-time64.c create mode 100644 sysdeps/unix/sysv/linux/tst-recvmsg.c diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index faea02bd1b..be6fe08ac2 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -237,6 +237,9 @@ sysdep_routines += cmsg_nxthdr CFLAGS-recvmmsg.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-sendmmsg.c = -fexceptions -fasynchronous-unwind-tables +tests += tst-recvmsg +tests-time64 += tst-recvmsg-time64 + tests-special += $(objpfx)tst-socket-consts.out $(objpfx)tst-socket-consts.out: ../sysdeps/unix/sysv/linux/tst-socket-consts.py PYTHONPATH=../scripts \ diff --git a/sysdeps/unix/sysv/linux/tst-recvmsg-time64.c b/sysdeps/unix/sysv/linux/tst-recvmsg-time64.c new file mode 100644 index 0000000000..6cc8bbff6b --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-recvmsg-time64.c @@ -0,0 +1 @@ +#include "tst-recvmsg.c" diff --git a/sysdeps/unix/sysv/linux/tst-recvmsg.c b/sysdeps/unix/sysv/linux/tst-recvmsg.c new file mode 100644 index 0000000000..361dcbb8cc --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-recvmsg.c @@ -0,0 +1,171 @@ +/* Check recvmsg timestamp support. + Copyright (C) 2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Some extra space added for ancillary data, it might be used to convert + 32-bit timestamp to 64-bit for _TIME_BITS=64 on older kernels. */ +static const int slack[] = { 0, 4, 8, 16, 32, 64 }; + +static size_t pagesize; + +static int +do_test_send (const struct sockaddr_in *addr, int nmsgs) +{ + int s = xsocket (AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0); + xconnect (s, (const struct sockaddr *) addr, sizeof (*addr)); + + for (int i = 0; i < nmsgs; i++) + xsendto (s, &i, sizeof (i), 0, (const struct sockaddr *) addr, + sizeof (*addr)); + + return 0; +} + +static void +do_recvmsg (int s, bool support_64_timestamp, void *cmsg, size_t slack, + size_t tsize, int exp_msg) +{ + /* A timestamp is expected if 32-bit timestamp are used (support in every + configuration) or if underlying kernel support 64-bit timestamps. + Otherwise recvmsg will need extra space do add the 64-bit timestamp. */ + bool exp_timestamp; + if (sizeof (time_t) == 4 || support_64_timestamp) + exp_timestamp = true; + else + exp_timestamp = slack >= CMSG_SPACE (tsize); + + int msg; + struct iovec iov = + { + .iov_base = &msg, + .iov_len = sizeof (msg) + }; + size_t msgs = CMSG_SPACE (tsize) + slack; + struct msghdr msghdr = + { + .msg_name = NULL, + .msg_namelen = 0, + .msg_iov = &iov, + .msg_iovlen = 1, + .msg_controllen = msgs, + .msg_control = cmsg != NULL ? cmsg + pagesize - msgs : NULL, + }; + TEST_COMPARE (recvmsg (s, &msghdr, 0), sizeof (int)); + TEST_COMPARE (msg, exp_msg); + + if (cmsg == NULL) + return; + + int timestamp = false; + for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&msghdr); + cmsg != NULL; + cmsg = CMSG_NXTHDR (&msghdr, cmsg)) + { + if (cmsg->cmsg_level != SOL_SOCKET) + continue; + if (cmsg->cmsg_type == SCM_TIMESTAMP + && cmsg->cmsg_len == CMSG_LEN (sizeof (struct timeval))) + { + struct timeval tv; + memcpy (&tv, CMSG_DATA (cmsg), sizeof (tv)); + printf ("SCM_TIMESTAMP: {%jd, %jd}\n", (intmax_t)tv.tv_sec, + (intmax_t)tv.tv_usec); + timestamp = true; + } + else if (cmsg->cmsg_type == SCM_TIMESTAMPNS + && cmsg->cmsg_len == CMSG_LEN (sizeof (struct timespec))) + { + struct timespec ts; + memcpy (&ts, CMSG_DATA (cmsg), sizeof (ts)); + printf ("SCM_TIMESTAMPNS: {%jd, %jd}\n", (intmax_t)ts.tv_sec, + (intmax_t)ts.tv_nsec); + timestamp = true; + } + } + + /* If there is not timestamp in the ancilliary data, recvmsg should set + the flag inidcating it. */ + if (exp_timestamp && !timestamp) + TEST_VERIFY (msghdr.msg_flags & MSG_TRUNC); + else + TEST_COMPARE (exp_timestamp, timestamp); +} + +static int +do_test (void) +{ + int srv = xsocket (AF_INET, SOCK_DGRAM, 0); + struct sockaddr_in srv_addr = + { + .sin_family = AF_INET, + .sin_addr = {.s_addr = htonl (INADDR_LOOPBACK) }, + }; + xbind (srv, (struct sockaddr *) &srv_addr, sizeof (srv_addr)); + { + socklen_t sa_len = sizeof (srv_addr); + xgetsockname (srv, (struct sockaddr *) &srv_addr, &sa_len); + TEST_VERIFY (sa_len == sizeof (srv_addr)); + } + + TEST_COMPARE (recvmsg (-1, NULL, 0), -1); + TEST_COMPARE (errno, EBADF); + + /* Setup the ancillary data buffer with an extra page with PROT_NONE to + check the possible timestamp conversion on some systems. */ + pagesize = sysconf (_SC_PAGESIZE); + if (pagesize == -1) + FAIL_EXIT1 ("sysconf (_SC_PAGESIZE): %m\n"); + void *msgbuf = xmmap (0, 2 * pagesize, PROT_NONE, + MAP_ANONYMOUS | MAP_PRIVATE, -1); + xmprotect (msgbuf, pagesize, PROT_READ | PROT_WRITE); + + do_test_send (&srv_addr, 1); + do_recvmsg (srv, false, NULL, 0, 0, 0); + + /* If underlying kernel does not support */ + bool support_64_timestamp = support_socket_time64_timestamp (srv); + + /* Enable the timestamp using struct timeval precision. */ + xsetsockopt (srv, SOL_SOCKET, SO_TIMESTAMP, &(int){1}, sizeof (int)); + do_test_send (&srv_addr, array_length (slack)); + for (int s = 0; s < array_length (slack); s++) + do_recvmsg (srv, support_64_timestamp, msgbuf, slack[s], + sizeof (struct timeval), s); + + /* Now enable timestamp using a higher precision, it overwrites the previous + precision. */ + xsetsockopt (srv, SOL_SOCKET, SO_TIMESTAMPNS, &(int){1}, sizeof (int)); + do_test_send (&srv_addr, array_length (slack)); + for (int s = 0; s < array_length (slack); s++) + do_recvmsg (srv, support_64_timestamp, msgbuf, slack[s], + sizeof (struct timespec), s); + + return 0; +} + +#include