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net: rework SIOCGSTAMP ioctl handling

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The SIOCGSTAMP/SIOCGSTAMPNS ioctl commands are implemented by many
socket protocol handlers, and all of those end up calling the same
sock_get_timestamp()/sock_get_timestampns() helper functions, which
results in a lot of duplicate code.

With the introduction of 64-bit time_t on 32-bit architectures, this
gets worse, as we then need four different ioctl commands in each
socket protocol implementation.

To simplify that, let's add a new .gettstamp() operation in
struct proto_ops, and move ioctl implementation into the common
sock_ioctl()/compat_sock_ioctl_trans() functions that these all go
through.

We can reuse the sock_get_timestamp() implementation, but generalize
it so it can deal with both native and compat mode, as well as
timeval and timespec structures.

Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/lkml/CAK8P3a038aDQQotzua_QtKGhq8O9n+rdiz2=WDCp82ys8eUT+A@mail.gmail.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2019-04-17 22:51:48 +02:00 • committed by David S. Miller
parent 1ab839281c
commit c7cbdbf29f
33 changed files with 76 additions and 233 deletions
Download patch file Download diff file Expand all files Collapse all files

48
net/socket.c
View file

@ -1164,6 +1164,15 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
err = open_related_ns(&net->ns, get_net_ns);
break;
case SIOCGSTAMP:
case SIOCGSTAMPNS:
if (!sock->ops->gettstamp) {
err = -ENOIOCTLCMD;
break;
}
err = sock->ops->gettstamp(sock, argp,
cmd == SIOCGSTAMP, false);
break;
default:
err = sock_do_ioctl(net, sock, cmd, arg);
break;
@ -2916,38 +2925,6 @@ void socket_seq_show(struct seq_file *seq)
#endif /* CONFIG_PROC_FS */
#ifdef CONFIG_COMPAT
static int do_siocgstamp(struct net *net, struct socket *sock,
unsigned int cmd, void __user *up)
{
mm_segment_t old_fs = get_fs();
struct timeval ktv;
int err;
set_fs(KERNEL_DS);
err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
set_fs(old_fs);
if (!err)
err = compat_put_timeval(&ktv, up);
return err;
}
static int do_siocgstampns(struct net *net, struct socket *sock,
unsigned int cmd, void __user *up)
{
mm_segment_t old_fs = get_fs();
struct timespec kts;
int err;
set_fs(KERNEL_DS);
err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
set_fs(old_fs);
if (!err)
err = compat_put_timespec(&kts, up);
return err;
}
static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
{
struct compat_ifconf ifc32;
@ -3348,9 +3325,12 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
case SIOCDELRT:
return routing_ioctl(net, sock, cmd, argp);
case SIOCGSTAMP:
return do_siocgstamp(net, sock, cmd, argp);
case SIOCGSTAMPNS:
return do_siocgstampns(net, sock, cmd, argp);
if (!sock->ops->gettstamp)
return -ENOIOCTLCMD;
return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP,
!COMPAT_USE_64BIT_TIME);
case SIOCBONDSLAVEINFOQUERY:
case SIOCBONDINFOQUERY:
case SIOCSHWTSTAMP: