OVS datapath has check which prevents the installation of flow
that matches VLAN TCI but does not have exact match for VLAN_CFI
bit. To follow this rule, ovs userspace must make sure the
flow key for datapath flow matching VLAN TCI has exact match for
VLAN_CFI bit.
Before this commit, this is not enforced, so OpenFlow flow like
"vlan_tci=0x000a/0x0fff,action=output:local" can generate datapath
flow like "vlan(vid=5/0xfff,pcp=0/0x0,cfi=1/0)".
With the OVS datapath check, the installation of such datapath
flow will be rejected with:
"|WARN|system@ovs-system: failed to put[create][modify] (Invalid argument)"
This commit makes ovs userspace always exact match the VLAN_CFI
bit if the flow matches VLAN TCI.
Reported-by: Ronald Lee <ronald...@vmware.com>
Signed-off-by: Alex Wang <al...@nicira.com>
---
PATCH->V2:
- Fix careless testing.
- Adopt Jarno's suggestions.
---
ofproto/ofproto-dpif-xlate.c | 4 ++++
tests/ofproto-dpif.at | 16 ++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/ofproto/ofproto-dpif-xlate.c b/ofproto/ofproto-dpif-xlate.c
index 71b8bef..6bb8518 100644
--- a/ofproto/ofproto-dpif-xlate.c
+++ b/ofproto/ofproto-dpif-xlate.c
@@ -5033,6 +5033,10 @@ xlate_actions(struct xlate_in *xin, struct xlate_out
*xout)
wc->masks.tp_src &= htons(UINT8_MAX);
wc->masks.tp_dst &= htons(UINT8_MAX);
}
+ /* VLAN_TCI CFI bit must be matched if any of the TCI is matched. */
+ if (wc->masks.vlan_tci) {
+ wc->masks.vlan_tci |= htons(VLAN_CFI);
+ }
}
}
diff --git a/tests/ofproto-dpif.at b/tests/ofproto-dpif.at
index b5a9ad9..ef7c5c0 100644
--- a/tests/ofproto-dpif.at
+++ b/tests/ofproto-dpif.at
@@ -6673,3 +6673,19 @@
icmp6,vlan_tci=0x0000,dl_src=00:00:86:05:80:da,dl_dst=00:60:97:07:69:ea,ipv6_src
OVS_VSWITCHD_STOP
AT_CLEANUP
+# Tests the exact match of CFI bit in installed datapath flows matching VLAN.
+AT_SETUP([ofproto-dpif - vlan matching])
+OVS_VSWITCHD_START(
+ [add-port br0 p0 -- set Interface p0 type=dummy ofport_request=1])
+AT_CHECK([ovs-appctl vlog/set dpif:dbg dpif_netdev:dbg])
+
+AT_CHECK([ovs-ofctl del-flows br0])
+AT_CHECK([ovs-ofctl add-flow br0 "vlan_tci=0x000a/0x0fff,action=output:local"])
+
+AT_CHECK([ovs-appctl netdev-dummy/receive p0
'in_port(1),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0a),eth_type(0x8100),vlan(vid=10,pcp=0),encap(eth_type(0x0800),ipv4(src=10.0.0.2,dst=10.0.0.1,proto=1,tos=0,ttl=64,frag=no),icmp(type=8,code=0))'])
+
+AT_CHECK([cat ovs-vswitchd.log | grep 'in_port=[[1]]' | FILTER_FLOW_INSTALL |
STRIP_XOUT], [0], [dnl
+recirc_id=0,ip,in_port=1,dl_vlan=10,nw_frag=no, actions: <del>
+])
+OVS_VSWITCHD_STOP
+AT_CLEANUP
\ No newline at end of file
--
1.7.9.5
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