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socket: move compat timeout handling into sock.c

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This is a cleanup to prepare for the addition of 64-bit time_t
in O_SNDTIMEO/O_RCVTIMEO. The existing compat handler seems
unnecessarily complex and error-prone, moving it all into the
main setsockopt()/getsockopt() implementation requires half
as much code and is easier to extend.

32-bit user space can now use old_timeval32 on both 32-bit
and 64-bit machines, while 64-bit code can use
__old_kernel_timeval.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann
2019-02-02 07:34:44 -08:00
committed by David S. Miller
parent a9bcfd1d17
commit fe0c72f3db
3 changed files with 46 additions and 89 deletions
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65
net/core/sock.c
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@@ -335,14 +335,48 @@ int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
}
EXPORT_SYMBOL(__sk_backlog_rcv);
static int sock_get_timeout(long timeo, void *optval)
{
struct __kernel_old_timeval tv;
if (timeo == MAX_SCHEDULE_TIMEOUT) {
tv.tv_sec = 0;
tv.tv_usec = 0;
} else {
tv.tv_sec = timeo / HZ;
tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
}
if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
*(struct old_timeval32 *)optval = tv32;
return sizeof(tv32);
}
*(struct __kernel_old_timeval *)optval = tv;
return sizeof(tv);
}
static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
{
struct timeval tv;
struct __kernel_old_timeval tv;
if (optlen < sizeof(tv))
return -EINVAL;
if (copy_from_user(&tv, optval, sizeof(tv)))
return -EFAULT;
if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
struct old_timeval32 tv32;
if (optlen < sizeof(tv32))
return -EINVAL;
if (copy_from_user(&tv32, optval, sizeof(tv32)))
return -EFAULT;
tv.tv_sec = tv32.tv_sec;
tv.tv_usec = tv32.tv_usec;
} else {
if (optlen < sizeof(tv))
return -EINVAL;
if (copy_from_user(&tv, optval, sizeof(tv)))
return -EFAULT;
}
if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
return -EDOM;
@@ -1121,7 +1155,8 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
int val;
u64 val64;
struct linger ling;
struct timeval tm;
struct old_timeval32 tm32;
struct __kernel_old_timeval tm;
struct sock_txtime txtime;
} v;
@@ -1222,25 +1257,11 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
break;
case SO_RCVTIMEO:
lv = sizeof(struct timeval);
if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
v.tm.tv_sec = 0;
v.tm.tv_usec = 0;
} else {
v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * USEC_PER_SEC) / HZ;
}
lv = sock_get_timeout(sk->sk_rcvtimeo, &v);
break;
case SO_SNDTIMEO:
lv = sizeof(struct timeval);
if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
v.tm.tv_sec = 0;
v.tm.tv_usec = 0;
} else {
v.tm.tv_sec = sk->sk_sndtimeo / HZ;
v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * USEC_PER_SEC) / HZ;
}
lv = sock_get_timeout(sk->sk_sndtimeo, &v);
break;
case SO_RCVLOWAT: