798d716df7
Commit 948ce73b31 made recvmsg/recvmmsg to always call
__convert_scm_timestamps for 64 bit time_t symbol, so adjust it to
always build it for __TIMESIZE != 64.
It fixes build for architecture with 32 bit time_t support when
configured with minimum kernel of 5.1.
103 lines
3 KiB
C
103 lines
3 KiB
C
/* Socket timestamp conversion routines.
|
|
Copyright (C) 2021-2022 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 <bits/timesize.h>
|
|
|
|
#if __TIMESIZE != 64
|
|
# include <stdint.h>
|
|
# include <string.h>
|
|
# include <sys/socket.h>
|
|
# include <socket-constants-time64.h>
|
|
|
|
/* It converts the first SO_TIMESTAMP or SO_TIMESTAMPNS with 32-bit time and
|
|
appends it to the control buffer. The 32-bit time field is kept as-is.
|
|
|
|
Calls with __TIMESIZE=32 will see the converted 64-bit time control
|
|
messages as spurious control message of unknown type.
|
|
|
|
Calls with __TIMESIZE=64 running on pre-time64 kernels will see the
|
|
original message as a spurious control ones of unknown typ while running
|
|
on kernel with native 64-bit time support will only see the time64 version
|
|
of the control message. */
|
|
void
|
|
__convert_scm_timestamps (struct msghdr *msg, socklen_t msgsize)
|
|
{
|
|
if (msg->msg_control == NULL || msg->msg_controllen == 0)
|
|
return;
|
|
|
|
/* The returned control message format for SO_TIMESTAMP_NEW is a
|
|
'struct __kernel_sock_timeval' while for SO_TIMESTAMPNS_NEW is a
|
|
'struct __kernel_timespec'. In either case it is two uint64_t
|
|
members. */
|
|
int64_t tvts[2];
|
|
int32_t tmp[2];
|
|
|
|
struct cmsghdr *cmsg, *last = NULL;
|
|
int type = 0;
|
|
|
|
for (cmsg = CMSG_FIRSTHDR (msg);
|
|
cmsg != NULL;
|
|
cmsg = CMSG_NXTHDR (msg, cmsg))
|
|
{
|
|
last = cmsg;
|
|
|
|
if (cmsg->cmsg_level != SOL_SOCKET)
|
|
continue;
|
|
|
|
switch (cmsg->cmsg_type)
|
|
{
|
|
case COMPAT_SO_TIMESTAMP_OLD:
|
|
if (type != 0)
|
|
break;
|
|
type = COMPAT_SO_TIMESTAMP_NEW;
|
|
goto common;
|
|
|
|
case COMPAT_SO_TIMESTAMPNS_OLD:
|
|
type = COMPAT_SO_TIMESTAMPNS_NEW;
|
|
|
|
/* fallthrough */
|
|
common:
|
|
memcpy (tmp, CMSG_DATA (cmsg), sizeof (tmp));
|
|
tvts[0] = tmp[0];
|
|
tvts[1] = tmp[1];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (type == 0)
|
|
return;
|
|
|
|
if (CMSG_SPACE (sizeof tvts) > msgsize - msg->msg_controllen)
|
|
{
|
|
msg->msg_flags |= MSG_CTRUNC;
|
|
return;
|
|
}
|
|
|
|
/* Zero memory for the new cmsghdr, so reading cmsg_len field
|
|
by CMSG_NXTHDR does not trigger UB. */
|
|
memset (msg->msg_control + msg->msg_controllen, 0,
|
|
CMSG_SPACE (sizeof tvts));
|
|
msg->msg_controllen += CMSG_SPACE (sizeof tvts);
|
|
cmsg = CMSG_NXTHDR (msg, last);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = type;
|
|
cmsg->cmsg_len = CMSG_LEN (sizeof tvts);
|
|
memcpy (CMSG_DATA (cmsg), tvts, sizeof tvts);
|
|
}
|
|
#endif
|