1 files changed, 265 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tst-socket-timestamp-compat.c b/sysdeps/unix/sysv/linux/tst-socket-timestamp-compat.c
new file mode 100644
index 0000000000..de261dae5a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tst-socket-timestamp-compat.c
@@ -0,0 +1,265 @@
+/* Check recvmsg/recvmmsg 64-bit timestamp support.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <arpa/inet.h>
+#include <string.h>
+#include <support/check.h>
+#include <support/xsocket.h>
+#include <support/xunistd.h>
+#include <stdbool.h>
+
+/* AF_INET socket and address used to receive data.  */
+static int srv;
+static struct sockaddr_in srv_addr;
+
+static int
+do_sendto (const struct sockaddr_in *addr, int payload)
+{
+  int s = xsocket (AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
+  xconnect (s, (const struct sockaddr *) addr, sizeof (*addr));
+
+  xsendto (s, &payload, sizeof (payload), 0, (const struct sockaddr *) addr,
+	   sizeof (*addr));
+
+  xclose (s);
+
+  return 0;
+}
+
+static void
+do_recvmsg_ancillary (bool use_multi_call, struct mmsghdr *mmhdr,
+		      void *msgbuf, size_t msgbuflen, int exp_payload)
+{
+  int payload;
+  struct iovec iov =
+    {
+      .iov_base = &payload,
+      .iov_len = sizeof (payload)
+    };
+  mmhdr->msg_hdr.msg_name = NULL;
+  mmhdr->msg_hdr.msg_iov = &iov;
+  mmhdr->msg_hdr.msg_iovlen = 1;
+  mmhdr->msg_hdr.msg_control = msgbuf;
+  mmhdr->msg_hdr.msg_controllen = msgbuflen;
+
+  int r;
+  if (use_multi_call)
+    {
+      r = recvmmsg (srv, mmhdr, 1, 0, NULL);
+      if (r >= 0)
+	r = mmhdr->msg_len;
+    }
+  else
+    r = recvmsg (srv, &mmhdr->msg_hdr, 0);
+  TEST_COMPARE (r, sizeof (int));
+  TEST_COMPARE (payload, exp_payload);
+}
+
+/* Check if recvmsg create the additional 64 bit timestamp if only 32 bit
+   is enabled for 64 bit recvmsg symbol.  */
+static void
+do_test_large_buffer (bool mc)
+{
+  struct mmsghdr mmhdr = { 0 };
+  /* It should be large enought for either timeval/timespec and the
+     64 time type as well.  */
+
+  union
+  {
+    struct cmsghdr cmsghdr;
+    char msgbuf[512];
+  } control;
+
+  /* Enable 32 bit timeval precision and check if no 64 bit timeval stamp
+     is created.  */
+  {
+    int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMP_OLD, &(int){1},
+			sizeof (int));
+    TEST_VERIFY_EXIT (r != -1);
+
+    do_sendto (&srv_addr, 42);
+    do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
+
+    bool found_timestamp = false;
+    for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
+	 cmsg != NULL;
+	 cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
+    {
+      if (cmsg->cmsg_level != SOL_SOCKET)
+	continue;
+
+      if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMP_NEW)
+	found_timestamp = true;
+      else
+	TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMP_NEW);
+    }
+
+    TEST_COMPARE (found_timestamp, sizeof (time_t) > 4);
+  }
+
+  /* Same as before, but for timespec.  */
+  {
+    int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMPNS_OLD, &(int){1},
+			sizeof (int));
+    TEST_VERIFY_EXIT (r != -1);
+
+    do_sendto (&srv_addr, 42);
+    do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
+
+    bool found_timestamp = false;
+    for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
+	 cmsg != NULL;
+	 cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
+    {
+      if (cmsg->cmsg_level != SOL_SOCKET)
+	continue;
+
+      if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMPNS_NEW)
+	found_timestamp = true;
+      else
+	TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMPNS_NEW);
+    }
+
+    TEST_COMPARE (found_timestamp, sizeof (time_t) > 4);
+  }
+}
+
+/* Check if recvmsg does not create the additional 64 bit timestamp if
+   only 32 bit timestamp is enabled if the ancillary buffer is not large
+   enought.  Also checks if MSG_CTRUNC is set iff for 64 bit recvmsg
+   symbol.  */
+static void
+do_test_small_buffer (bool mc)
+{
+  struct mmsghdr mmhdr = { 0 };
+
+  /* Enable 32 bit timeval precision and check if no 64 bit timeval stamp
+     is created.  */
+  {
+    int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMP_OLD, &(int){1},
+			sizeof (int));
+    TEST_VERIFY_EXIT (r != -1);
+
+    union
+    {
+      struct cmsghdr cmsghdr;
+      char msgbuf[CMSG_SPACE (sizeof (struct timeval))];
+    } control;
+
+    do_sendto (&srv_addr, 42);
+    do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
+
+    bool found_timestamp = false;
+    for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
+	 cmsg != NULL;
+	 cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
+    {
+      if (cmsg->cmsg_level != SOL_SOCKET)
+	continue;
+
+      if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMP_NEW)
+	found_timestamp = true;
+      else
+	TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMP_NEW);
+    }
+
+    if (sizeof (time_t) > 4)
+      {
+	TEST_VERIFY ((mmhdr.msg_hdr.msg_flags & MSG_CTRUNC));
+	TEST_COMPARE (found_timestamp, 0);
+      }
+    else
+      {
+	TEST_VERIFY (!(mmhdr.msg_hdr.msg_flags & MSG_CTRUNC));
+	TEST_COMPARE (found_timestamp, 0);
+      }
+  }
+
+  /* Same as before, but for timespec.  */
+  {
+    int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMPNS_OLD, &(int){1},
+			sizeof (int));
+    TEST_VERIFY_EXIT (r != -1);
+
+    union
+    {
+      struct cmsghdr cmsghdr;
+      char msgbuf[CMSG_SPACE (sizeof (struct timespec))];
+    } control;
+
+    do_sendto (&srv_addr, 42);
+    do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
+
+    bool found_timestamp = false;
+    for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
+	 cmsg != NULL;
+	 cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
+    {
+      if (cmsg->cmsg_level != SOL_SOCKET)
+	continue;
+
+      if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMPNS_NEW)
+	found_timestamp = true;
+      else
+	TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMPNS_NEW);
+    }
+
+    if (sizeof (time_t) > 4)
+      {
+	TEST_VERIFY ((mmhdr.msg_hdr.msg_flags & MSG_CTRUNC));
+	TEST_COMPARE (found_timestamp, 0);
+      }
+    else
+      {
+	TEST_VERIFY ((mmhdr.msg_hdr.msg_flags & MSG_CTRUNC) == 0);
+	TEST_COMPARE (found_timestamp, 0);
+      }
+  }
+}
+
+static int
+do_test (void)
+{
+  /* This test only make sense for ABIs that support 32 bit time_t socket
+     timestampss.  */
+  if (sizeof (time_t) > 4 && __WORDSIZE == 64)
+    return 0;
+
+  srv = xsocket (AF_INET, SOCK_DGRAM, 0);
+  srv_addr = (struct sockaddr_in) {
+    .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));
+  }
+
+  /* Check recvmsg;  */
+  do_test_large_buffer (false);
+  do_test_small_buffer (false);
+  /* Check recvmmsg.  */
+  do_test_large_buffer (true);
+  do_test_small_buffer (true);
+
+  return 0;
+}
+
+#include <support/test-driver.c>