[OPNFLWPLUG-267] The way of handling values for SET_NW_TOS action is wrong

Mon, 27 Sep 2021 09:01:19 +0000

The way of handling values for SET_NW_TOS action is wrong.
Consequently, I cannot set some values for SET_NW_TOS action.

I detected the issue with the latest Base Edition on 09/07/2014.
And I've found out that the issue occurs with bout the MD-SAL OpenFlow plugin and the AD-SAL OpenFlow plugin.

First of all, it was failed to create a flow entry which had a SetNwTos action to set 1 into DSCP field.

$ curl --user "admin":"admin" -H "Content-type: application/json" -X PUT \
http://localhost:8080/controller/nb/v2/flowprogrammer/default/node/OF/00:00:00:00:00:00:00:01/staticFlow/flow1 \
-d '{ "installInHw":"true", "name":"flow1", "node":

{"id":"00:00:00:00:00:00:00:01","type":"OF"}

,"ingressPort":"1","priority":"500","actions":["SET_NW_TOS=1"] }'

Even after I executed the above curl command, the flow entry was not installed into the switch.
I observed that the controller sent a FLOW_MOD message to the switch, and the switch sent a ERROR message to the controller.

It seemed to me that the AD-SAL used the passed value "1" for the nw_tos field for OFPAT_SET_NW_TOS in FLOW_MOD messages.
"1" in TOS field means DSCP=0 and ECP=1, altought OpenFlow controllers can set a value only in DSCP field.

1 2 3 4 5 6 7
-----------------------

DSCP field

ECP field

-----------------------

Next, to set 1 into DSCP field, I set 4 (1 << 2) to a SET_NW_TOS.

{"id":"00:00:00:00:00:00:00:01","type":"OF"}

,"ingressPort":"1","priority":"500","actions":["SET_NW_TOS=4"] }'

I saw the flow entry which contained the action which set 4 into TOS field. (It meant to set 1 into DSCP field.)

mininet> dpctl dump-flows

- - s1 ------------------------------------------------------------------------
    NXST_FLOW reply (xid=0x4):
    cookie=0xa, duration=3727.481s, table=0, n_packets=0, n_bytes=0, idle_age=3727, priority=0 actions=CONTROLLER:65535
    cookie=0x0, duration=2.677s, table=0, n_packets=0, n_bytes=0, idle_age=2, priority=500,in_port=1 actions=mod_nw_tos:4

Thirdly, to set 63 into DSCP field, I set 252 (63 << 2) to a SetNwTos.
However, it was also failed.

{"id":"00:00:00:00:00:00:00:01","type":"OF"}

,"ingressPort":"1","priority":"500","actions":["SET_NW_TOS=252"] }'

The response message of the above request was:
Invalid Configuration (IP ToS bits 252 is not in the range 0 - 63)

I saw the following output in the OSGi console of the controller.

2014-09-05 19:54:47.069 EDT [http-bio-8080-exec-4] WARN o.o.c.f.i.ForwardingRulesManager - Invalid Configuration for flow FlowConfig [dynamic=false, status=Invalid Configuration (IP ToS bits 252 is not in the range 0 - 63), installInHw=true, name=flow1, switchId=OF|00:00:00:00:00:00:00:01, ingressPort=1, portGroup=null, etherType=null, priority=500, vlanId=null, vlanPriority=null, dlSrc=null, dlDst=null, nwSrc=null, nwDst=null, protocol=null, tosBits=null, tpSrc=null, tpDst=null, cookie=null, idleTimeout=null, hardTimeout=null, actions=[SET_NW_TOS=252]]. The failure is IP ToS bits 252 is not in the range 0 - 63

OpenDaylight JIRA

[OPNFLWPLUG-267] The way of handling values for SET_NW_TOS action is wrong