netdev - [PATCH net 3/3] openvswitch: Fix FLOW

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Message-Id: <1346785688-2910-4-git-send-email-jesse@nicira.com>
Date:	Tue,  4 Sep 2012 12:08:08 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, dev@...nvswitch.org
Subject: [PATCH net 3/3] openvswitch: Fix FLOW_BUFSIZE definition.

The vlan encapsulation fields in the maximum flow defintion were
never updated when the representation changed before upstreaming.
In theory this could cause a kernel panic when a maximum length
flow is used.  In practice this has never happened (to my knowledge)
because skb allocations are padded out to a cache line so you would
need the right combination of flow and packet being sent to userspace.

Signed-off-by: Jesse Gross <jesse@...ira.com>
---
 net/openvswitch/flow.h |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index 9b75617..c30df1a 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -145,15 +145,17 @@ u64 ovs_flow_used_time(unsigned long flow_jiffies);
  *  OVS_KEY_ATTR_PRIORITY      4    --     4      8
  *  OVS_KEY_ATTR_IN_PORT       4    --     4      8
  *  OVS_KEY_ATTR_ETHERNET     12    --     4     16
+ *  OVS_KEY_ATTR_ETHERTYPE     2     2     4      8  (outer VLAN ethertype)
  *  OVS_KEY_ATTR_8021Q         4    --     4      8
- *  OVS_KEY_ATTR_ETHERTYPE     2     2     4      8
+ *  OVS_KEY_ATTR_ENCAP         0    --     4      4  (VLAN encapsulation)
+ *  OVS_KEY_ATTR_ETHERTYPE     2     2     4      8  (inner VLAN ethertype)
  *  OVS_KEY_ATTR_IPV6         40    --     4     44
  *  OVS_KEY_ATTR_ICMPV6        2     2     4      8
  *  OVS_KEY_ATTR_ND           28    --     4     32
  *  -------------------------------------------------
- *  total                                       132
+ *  total                                       144
  */
-#define FLOW_BUFSIZE 132
+#define FLOW_BUFSIZE 144

 int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
 int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
-- 
1.7.9.5

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