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net/sched: cls_u32: fix cls_u32 on filter replace 

[ Upstream commit eb53f7af6f ]

The following sequence is currently broken:

 # tc qdisc add dev foo ingress
 # tc filter replace dev foo protocol all ingress \
   u32 match u8 0 0 action mirred egress mirror dev bar1
 # tc filter replace dev foo protocol all ingress \
   handle 800::800 pref 49152 \
   u32 match u8 0 0 action mirred egress mirror dev bar2
 Error: cls_u32: Key node flags do not match passed flags.
 We have an error talking to the kernel, -1

The error comes from u32_change() when comparing new and
existing flags. The existing ones always contains one of
TCA_CLS_FLAGS_{,NOT}_IN_HW flag depending on offloading state.
These flags cannot be passed from userspace so the condition
(n->flags != flags) in u32_change() always fails.

Fix the condition so the flags TCA_CLS_FLAGS_NOT_IN_HW and
TCA_CLS_FLAGS_IN_HW are not taken into account.

Fixes: 24d3dc6d27 ("net/sched: cls_u32: Reflect HW offload status")
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Ivan Vecera 2018-02-08 16:10:39 +01:00 committed by Greg Kroah-Hartman
parent a01550d778
commit 54d6bc97b4
1 changed files with 2 additions and 1 deletions
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3
net/sched/cls_u32.c
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@ -927,7 +927,8 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
if (TC_U32_KEY(n->handle) == 0)
return -EINVAL;
if (n->flags != flags)
if ((n->flags ^ flags) &
~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW))
return -EINVAL;
new = u32_init_knode(tp, n);