net: don't allow user space to lift the device limits

Up until commit 46e6b992c250 ("rtnetlink: allow GSO maximums to
be set on device creation") the gso_max_segs and gso_max_size
of a device were not controlled from user space.

The quoted commit added the ability to control them because of
the following setup:

 netns A  |  netns B
     veth<->veth   eth0

If eth0 has TSO limitations and user wants to efficiently forward
traffic between eth0 and the veths they should copy the TSO
limitations of eth0 onto the veths. This would happen automatically
for macvlans or ipvlan but veth users are not so lucky (given the
loose coupling).

Unfortunately the commit in question allowed users to also override
the limits on real HW devices.

It may be useful to control the max GSO size and someone may be using
that ability (not that I know of any user), so create a separate set
of knobs to reliably record the TSO limitations. Validate the user
requests.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 006bb5c0e4130c..e12f7de6d6ae0e 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1917,8 +1917,10 @@ enum netdev_ml_priv_type {
  *	@rtnl_link_ops:	Rtnl_link_ops
  *
  *	@gso_max_size:	Maximum size of generic segmentation offload
+ *	@tso_max_size:	Device (as in HW) limit on the max TSO request size
  *	@gso_max_segs:	Maximum number of segments that can be passed to the
  *			NIC for GSO
+ *	@tso_max_segs:	Device (as in HW) limit on the max TSO segment count
  *
  *	@dcbnl_ops:	Data Center Bridging netlink ops
  *	@num_tc:	Number of traffic classes in the net device
@@ -2262,8 +2264,13 @@ struct net_device {
 	/* for setting kernel sock attribute on TCP connection setup */
 #define GSO_MAX_SIZE		65536
 	unsigned int		gso_max_size;
+#define TSO_LEGACY_MAX_SIZE	65536
+#define TSO_MAX_SIZE		UINT_MAX
+	unsigned int		tso_max_size;
 #define GSO_MAX_SEGS		65535
 	u16			gso_max_segs;
+#define TSO_MAX_SEGS		U16_MAX
+	u16			tso_max_segs;
 
 #ifdef CONFIG_DCB
 	const struct dcbnl_rtnl_ops *dcbnl_ops;
@@ -4895,6 +4902,8 @@ static inline void netif_set_gro_max_size(struct net_device *dev,
 	WRITE_ONCE(dev->gro_max_size, size);
 }
 
+void netif_set_tso_max_size(struct net_device *dev, unsigned int size);
+void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs);
 void netif_inherit_tso_max(struct net_device *to,
 			   const struct net_device *from);