Messages in this thread Patch in this message | | | From | Arnd Bergmann <> | Subject | [RFC net-next 01/28] net: split out SIOCDEVPRIVATE handling from dev_ioctl | Date | Fri, 6 Nov 2020 23:17:16 +0100 |
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From: Arnd Bergmann <arnd@arndb.de>
SIOCDEVPRIVATE ioctl commands are mainly used in really old drivers, and they have a number of problems:
- They hide behind the normal .ndo_do_ioctl function that is also used for other things in modern drivers, so it's hard to spot a driver that actually uses one of these
- Since drivers use a number different calling conventions, it is impossible to support compat mode for them in a generic way.
- With all drivers using the same 16 commands codes, there is no way to introspect the data being passed through things like strace.
Add a new net_device_ops callback pointer, to address the first two of these. Separating them from .ndo_do_ioctl makes it easy to grep for drivers with a .ndo_siocdevprivate callback, and the unwieldy name hopefully makes it easier to spot in code review.
By passing the ifreq structure and the ifr_data pointer separately, it is no longer necessary to overload these, and the driver can use either one for a given command.
Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- include/linux/netdevice.h | 3 +++ net/core/dev_ioctl.c | 25 ++++++++++++++++++++++--- 2 files changed, 25 insertions(+), 3 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index d1b7fb1241b3..93f980e1d69b 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1301,6 +1301,9 @@ struct net_device_ops { int (*ndo_validate_addr)(struct net_device *dev); int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); + int (*ndo_siocdevprivate)(struct net_device *dev, + struct ifreq *ifr, + void __user *data, int cmd); int (*ndo_set_config)(struct net_device *dev, struct ifmap *map); int (*ndo_change_mtu)(struct net_device *dev, diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c index 5822737a78f4..58daf41a4a08 100644 --- a/net/core/dev_ioctl.c +++ b/net/core/dev_ioctl.c @@ -269,6 +269,23 @@ static int dev_do_ioctl(struct net_device *dev, return err; } +static int dev_siocdevprivate(struct net_device *dev, + struct ifreq *ifr, unsigned int cmd) +{ + const struct net_device_ops *ops = dev->netdev_ops; + void __user *data = ifr->ifr_data; + + if (ops->ndo_siocdevprivate) { + if (netif_device_present(dev)) + return ops->ndo_siocdevprivate(dev, ifr, data, cmd); + else + return -ENODEV; + } + + /* fall back to do_ioctl for drivers not yet converted */ + return dev_do_ioctl(dev, ifr, cmd); +} + /* * Perform the SIOCxIFxxx calls, inside rtnl_lock() */ @@ -346,9 +363,11 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) * Unknown or private ioctl */ default: - if ((cmd >= SIOCDEVPRIVATE && - cmd <= SIOCDEVPRIVATE + 15) || - cmd == SIOCBONDENSLAVE || + if (cmd >= SIOCDEVPRIVATE && + cmd <= SIOCDEVPRIVATE + 15) + return dev_siocdevprivate(dev, ifr, cmd); + + if (cmd == SIOCBONDENSLAVE || cmd == SIOCBONDRELEASE || cmd == SIOCBONDSETHWADDR || cmd == SIOCBONDSLAVEINFOQUERY || -- 2.27.0
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