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>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 006bb5c..e12f7de 100644 (file)
--- 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);
 

diff --git a/net/core/dev.c b/net/core/dev.c
index eef1d19..6ae085b 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2993,6 +2993,39 @@ undo_rx:
 EXPORT_SYMBOL(netif_set_real_num_queues);
 
 /**
+ * netif_set_tso_max_size() - set the max size of TSO frames supported
+ * @dev:       netdev to update
+ * @size:      max skb->len of a TSO frame
+ *
+ * Set the limit on the size of TSO super-frames the device can handle.
+ * Unless explicitly set the stack will assume the value of %GSO_MAX_SIZE.
+ */
+void netif_set_tso_max_size(struct net_device *dev, unsigned int size)
+{
+       dev->tso_max_size = size;
+       if (size < READ_ONCE(dev->gso_max_size))
+               netif_set_gso_max_size(dev, size);
+}
+EXPORT_SYMBOL(netif_set_tso_max_size);
+
+/**
+ * netif_set_tso_max_segs() - set the max number of segs supported for TSO
+ * @dev:       netdev to update
+ * @segs:      max number of TCP segments
+ *
+ * Set the limit on the number of TCP segments the device can generate from
+ * a single TSO super-frame.
+ * Unless explicitly set the stack will assume the value of %GSO_MAX_SEGS.
+ */
+void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs)
+{
+       dev->tso_max_segs = segs;
+       if (segs < READ_ONCE(dev->gso_max_segs))
+               netif_set_gso_max_segs(dev, segs);
+}
+EXPORT_SYMBOL(netif_set_tso_max_segs);
+
+/**
  * netif_inherit_tso_max() - copy all TSO limits from a lower device to an upper
  * @to:                netdev to update
  * @from:      netdev from which to copy the limits
@@ -10572,6 +10605,8 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
        dev->gso_max_size = GSO_MAX_SIZE;
        dev->gso_max_segs = GSO_MAX_SEGS;
        dev->gro_max_size = GRO_MAX_SIZE;
+       dev->tso_max_size = TSO_LEGACY_MAX_SIZE;
+       dev->tso_max_segs = TSO_MAX_SEGS;
        dev->upper_level = 1;
        dev->lower_level = 1;
 #ifdef CONFIG_LOCKDEP

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index eea5ed0..e6d4b92 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2803,7 +2803,7 @@ static int do_setlink(const struct sk_buff *skb,
        if (tb[IFLA_GSO_MAX_SIZE]) {
                u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
 
-               if (max_size > GSO_MAX_SIZE) {
+               if (max_size > GSO_MAX_SIZE || max_size > dev->tso_max_size) {
                        err = -EINVAL;
                        goto errout;
                }
@@ -2817,7 +2817,7 @@ static int do_setlink(const struct sk_buff *skb,
        if (tb[IFLA_GSO_MAX_SEGS]) {
                u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
 
-               if (max_segs > GSO_MAX_SEGS) {
+               if (max_segs > GSO_MAX_SEGS || max_segs > dev->tso_max_segs) {
                        err = -EINVAL;
                        goto errout;
                }