topic Re: How to use "set_field" in Software Defined Networking

How to use "set_field"

shcha — Thu, 28 Nov 2013 11:12:04 GMT

I want to create a flow that before packets send egress port, change the destination ip.

I use the RSdoc on HP VAN SDN Controller 2.0, below is flow JSON string

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

{"flow": {

"priority": 30000,

"table_id": 0,

"idle_timeout": 60,

"match": [

{"ipv4_src": "10.0.0.2"},

{"ipv4_dst": "10.0.0.22"},

{"ip_proto": "tcp"},

{"eth_type": "ipv4"},

{"tcp_dst": "80"}

"instructions": [

{"apply_actions": [{"set_field" : [{"ipv4_dst": "10.0.0.25"}]},

{"output": 66}]}]

}}

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

then result is below

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

HTTP Status 500 - com.fasterxml.jackson.databind.node.ArrayNode cannot be cast to com.fasterxml.jackson.databind.node.ObjectNode

type Exception report

message com.fasterxml.jackson.databind.node.ArrayNode cannot be cast to com.fasterxml.jackson.databind.node.ObjectNode

description The server encountered an internal error that prevented it from fulfilling this request.

exception

java.lang.ClassCastException: com.fasterxml.jackson.databind.node.ArrayNode cannot be cast to com.fasterxml.jackson.databind.node.ObjectNode

com.hp.of.json.ActionCodec.decodeSetField(ActionCodec.java:286)

com.hp.of.json.ActionCodec.decode(ActionCodec.java:238)

com.hp.of.json.InstructionCodec.decodeActions(InstructionCodec.java:211)

com.hp.of.json.InstructionCodec.decode(InstructionCodec.java:173)

com.hp.of.json.OfmFlowModCodec.decodeInstructions(OfmFlowModCodec.java:223)

com.hp.of.json.OfmFlowModCodec.decode(OfmFlowModCodec.java:181)

com.hp.of.json.OfmFlowModCodec.decode(OfmFlowModCodec.java:46)

com.hp.of.json.OfJsonCodec.decode(OfJsonCodec.java:59)

com.hp.of.json.OfJsonCodec.decode(OfJsonCodec.java:42)

com.hp.util.json.JSON.fromJson(JSON.java:68)

com.hp.sdn.rs.FlowProvider.create(FlowProvider.java:73)

com.hp.sdn.rs.DatapathsResource.createFlow(DatapathsResource.java:355)

sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source)

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

java.lang.reflect.Method.invoke(Method.java:606)

com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)

com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)

com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)

com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)

com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)

com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)

com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)

com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)

com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511)

com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442)

com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)

com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)

com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)

com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)

com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)

javax.servlet.http.HttpServlet.service(HttpServlet.java:848)

com.hp.util.rs.SecurityFilter.doFilter(SecurityFilter.java:94)

com.hp.util.rs.auth.AbstractTokenAuthFilter.doFilter(AbstractTokenAuthFilter.java:106)

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

If I removed "set_field" then I can receive 200 OK.

Above JSON string has problem? Please let me know how to use "set_field".

Thank you.

Re: How to use "set_field"

dave_tucker — Thu, 28 Nov 2013 11:39:43 GMT

Hi,

You can follow the intructions here to check the JSON Schema. This will help a lot.

The value of "set_field" should be "flow_match_field" object.

In the original JSON, you are passing an array ( the square brackets [])

{"set_field" : [{"ipv4_dst": "10.0.0.25"}]}

To fix this, simply remove the square brackets []

{"set_field" : {"ipv4_dst": "10.0.0.25"}}

So the new JSON would be...

{

"flow": {

"priority": 30000,

"table_id": 0,

"idle_timeout": 60,

"match": [

{

"ipv4_src": "10.0.0.2"

{

"ipv4_dst": "10.0.0.22"

{

"ip_proto": "tcp"

{

"eth_type": "ipv4"

{

"tcp_dst": "80"

}

"instructions": [

{

"apply_actions": [

{

"set_field": {

"ipv4_dst": "10.0.0.25"

}

{

"output": 66

}

]

}

]

}

Re: How to use "set_field"

shcha — Fri, 29 Nov 2013 02:50:03 GMT

Thanks for your answer.

Fixed JSON was good, but I receive below.

{
  "error": "java.lang.IllegalArgumentException",
  "message": "{ofm:[V_1_3,ERROR,76,3091],BAD_ACTION/BAD_SET_TYPE,#dataBytes=64,OFM-cause:[V_1_3,FLOW_MOD,128,3091]}"
}

OFS Specification describe that "BAD_ACTION/BAD_SET_TYPE" is Unsupported type in SET_FIELD action.

HP OFS not ready for changing IP ( port too) ?

I hope HP support flow_match_field's some property. ( ipv4_src, ipv4_dst, udp_src, udp_dst, ... )

Thanks.

Re: How to use "set_field"

dave_tucker — Sun, 01 Dec 2013 12:01:41 GMT

Check the HP OpenFlow Administrators Guide - Appendix A (p68)

There are several diagrams that show the capabilities of the OpenFlow implementation on HP switches.

This shows that the IP Src/IP Dst fields are currently not settable :(

Re: How to use "set_field"

Sietze Reitsma — Sun, 01 Dec 2013 23:15:20 GMT

It can be done in software, but you should be carefull with the resources.

you could set the table_id to the software table. (OF 1.3)

"table_id": 200,

Re: How to use "set_field"

sdnindia — Wed, 05 Mar 2014 13:47:46 GMT

Hi,

Please let us know if your problem is solved.

Please feel free to reply incase you have more questions around the same topic or open a new thread if new topic.

If you feel your question has been answered, please do let us know by marking this response as an accepted solution.

Thanks
HP SDN Team