diff --git a/providers/openflow/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/FlowModBuilder.java b/providers/openflow/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/FlowModBuilder.java
new file mode 100644
index 0000000..ecdd17c
--- /dev/null
+++ b/providers/openflow/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/FlowModBuilder.java
@@ -0,0 +1,243 @@
+package org.onlab.onos.provider.of.flow.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+import org.onlab.onos.net.flow.FlowRule;
+import org.onlab.onos.net.flow.TrafficSelector;
+import org.onlab.onos.net.flow.TrafficTreatment;
+import org.onlab.onos.net.flow.criteria.Criteria.EthCriterion;
+import org.onlab.onos.net.flow.criteria.Criteria.EthTypeCriterion;
+import org.onlab.onos.net.flow.criteria.Criteria.IPCriterion;
+import org.onlab.onos.net.flow.criteria.Criteria.IPProtocolCriterion;
+import org.onlab.onos.net.flow.criteria.Criteria.PortCriterion;
+import org.onlab.onos.net.flow.criteria.Criteria.VlanIdCriterion;
+import org.onlab.onos.net.flow.criteria.Criteria.VlanPcpCriterion;
+import org.onlab.onos.net.flow.criteria.Criterion;
+import org.onlab.onos.net.flow.instructions.Instruction;
+import org.onlab.onos.net.flow.instructions.Instructions.OutputInstruction;
+import org.onlab.onos.net.flow.instructions.L2ModificationInstruction;
+import org.onlab.onos.net.flow.instructions.L2ModificationInstruction.ModEtherInstruction;
+import org.onlab.onos.net.flow.instructions.L2ModificationInstruction.ModVlanIdInstruction;
+import org.onlab.onos.net.flow.instructions.L2ModificationInstruction.ModVlanPcpInstruction;
+import org.onlab.onos.net.flow.instructions.L3ModificationInstruction;
+import org.onlab.onos.net.flow.instructions.L3ModificationInstruction.ModIPInstruction;
+import org.projectfloodlight.openflow.protocol.OFFactory;
+import org.projectfloodlight.openflow.protocol.OFFlowMod;
+import org.projectfloodlight.openflow.protocol.OFFlowModFlags;
+import org.projectfloodlight.openflow.protocol.action.OFAction;
+import org.projectfloodlight.openflow.protocol.match.Match;
+import org.projectfloodlight.openflow.protocol.match.MatchField;
+import org.projectfloodlight.openflow.types.EthType;
+import org.projectfloodlight.openflow.types.IPv4Address;
+import org.projectfloodlight.openflow.types.IpProtocol;
+import org.projectfloodlight.openflow.types.MacAddress;
+import org.projectfloodlight.openflow.types.Masked;
+import org.projectfloodlight.openflow.types.OFBufferId;
+import org.projectfloodlight.openflow.types.OFPort;
+import org.projectfloodlight.openflow.types.OFVlanVidMatch;
+import org.projectfloodlight.openflow.types.VlanPcp;
+import org.projectfloodlight.openflow.types.VlanVid;
+import org.slf4j.Logger;
+
+
+public class FlowModBuilder {
+
+    private final Logger log = getLogger(getClass());
+
+    private final OFFactory factory;
+    private final TrafficTreatment treatment;
+    private final TrafficSelector selector;
+
+    private final int priority;
+
+
+
+    public FlowModBuilder(FlowRule flowRule, OFFactory factory) {
+        this.factory = factory;
+        this.treatment = flowRule.treatment();
+        this.selector = flowRule.selector();
+        this.priority = flowRule.priority();
+    }
+
+    public OFFlowMod buildFlowMod() {
+        Match match = buildMatch();
+        List<OFAction> actions = buildActions();
+
+        //TODO: what to do without bufferid? do we assume that there will be a pktout as well?
+        OFFlowMod fm = factory.buildFlowModify()
+                .setBufferId(OFBufferId.NO_BUFFER)
+                .setActions(actions)
+                .setMatch(match)
+                .setFlags(Collections.singleton(OFFlowModFlags.SEND_FLOW_REM))
+                .setIdleTimeout(10)
+                .setHardTimeout(10)
+                .setPriority(priority)
+                .build();
+
+        return fm;
+
+    }
+
+    private List<OFAction> buildActions() {
+        List<OFAction> acts = new LinkedList<>();
+        for (Instruction i : treatment.instructions()) {
+            switch (i.type()) {
+            case DROP:
+                log.warn("Saw drop action; assigning drop action");
+                return new LinkedList<>();
+            case L2MODIFICATION:
+                acts.add(buildL2Modification(i));
+            case L3MODIFICATION:
+                acts.add(buildL3Modification(i));
+            case OUTPUT:
+                OutputInstruction out = (OutputInstruction) i;
+                acts.add(factory.actions().buildOutput().setPort(
+                        OFPort.of((int) out.port().toLong())).build());
+                break;
+            case GROUP:
+            default:
+                log.warn("Instruction type {} not yet implemented.", i.type());
+            }
+        }
+
+        return acts;
+    }
+
+    private OFAction buildL3Modification(Instruction i) {
+        L3ModificationInstruction l3m = (L3ModificationInstruction) i;
+        ModIPInstruction ip;
+        switch (l3m.subtype()) {
+        case L3_DST:
+            ip = (ModIPInstruction) i;
+            return factory.actions().setNwDst(IPv4Address.of(ip.ip().toInt()));
+        case L3_SRC:
+            ip = (ModIPInstruction) i;
+            return factory.actions().setNwSrc(IPv4Address.of(ip.ip().toInt()));
+        default:
+            log.warn("Unimplemented action type {}.", l3m.subtype());
+            break;
+        }
+        return null;
+    }
+
+    private OFAction buildL2Modification(Instruction i) {
+        L2ModificationInstruction l2m = (L2ModificationInstruction) i;
+        ModEtherInstruction eth;
+        switch (l2m.subtype()) {
+        case L2_DST:
+            eth = (ModEtherInstruction) l2m;
+            return factory.actions().setDlDst(MacAddress.of(eth.mac().toLong()));
+        case L2_SRC:
+            eth = (ModEtherInstruction) l2m;
+            return factory.actions().setDlSrc(MacAddress.of(eth.mac().toLong()));
+        case VLAN_ID:
+            ModVlanIdInstruction vlanId = (ModVlanIdInstruction) l2m;
+            return factory.actions().setVlanVid(VlanVid.ofVlan(vlanId.vlanId.toShort()));
+        case VLAN_PCP:
+            ModVlanPcpInstruction vlanPcp = (ModVlanPcpInstruction) l2m;
+            return factory.actions().setVlanPcp(VlanPcp.of(vlanPcp.vlanPcp()));
+        default:
+            log.warn("Unimplemented action type {}.", l2m.subtype());
+            break;
+        }
+        return null;
+    }
+
+    private Match buildMatch() {
+        Match.Builder mBuilder = factory.buildMatch();
+        EthCriterion eth;
+        IPCriterion ip;
+        for (Criterion c : selector.criteria()) {
+            switch (c.type()) {
+            case IN_PORT:
+                PortCriterion inport = (PortCriterion) c;
+                mBuilder.setExact(MatchField.IN_PORT, OFPort.of((int) inport.port().toLong()));
+                break;
+            case ETH_SRC:
+                eth = (EthCriterion) c;
+                mBuilder.setExact(MatchField.ETH_SRC, MacAddress.of(eth.mac().toLong()));
+                break;
+            case ETH_DST:
+                eth = (EthCriterion) c;
+                mBuilder.setExact(MatchField.ETH_DST, MacAddress.of(eth.mac().toLong()));
+                break;
+            case ETH_TYPE:
+                EthTypeCriterion ethType = (EthTypeCriterion) c;
+                mBuilder.setExact(MatchField.ETH_TYPE, EthType.of(ethType.ethType()));
+                break;
+            case IPV4_DST:
+                ip = (IPCriterion) c;
+                if (ip.ip().isMasked()) {
+                    Masked<IPv4Address> maskedIp = Masked.of(IPv4Address.of(ip.ip().toInt()),
+                            IPv4Address.of(ip.ip().netmask().toInt()));
+                    mBuilder.setMasked(MatchField.IPV4_DST, maskedIp);
+                } else {
+                    mBuilder.setExact(MatchField.IPV4_DST, IPv4Address.of(ip.ip().toInt()));
+                }
+                break;
+            case IPV4_SRC:
+                ip = (IPCriterion) c;
+                if (ip.ip().isMasked()) {
+                    Masked<IPv4Address> maskedIp = Masked.of(IPv4Address.of(ip.ip().toInt()),
+                            IPv4Address.of(ip.ip().netmask().toInt()));
+                    mBuilder.setMasked(MatchField.IPV4_SRC, maskedIp);
+                } else {
+                    mBuilder.setExact(MatchField.IPV4_SRC, IPv4Address.of(ip.ip().toInt()));
+                }
+                break;
+            case IP_PROTO:
+                IPProtocolCriterion p = (IPProtocolCriterion) c;
+                mBuilder.setExact(MatchField.IP_PROTO, IpProtocol.of(p.protocol()));
+                break;
+            case VLAN_PCP:
+                VlanPcpCriterion vpcp = (VlanPcpCriterion) c;
+                mBuilder.setExact(MatchField.VLAN_PCP, VlanPcp.of(vpcp.priority()));
+                break;
+            case VLAN_VID:
+                VlanIdCriterion vid = (VlanIdCriterion) c;
+                mBuilder.setExact(MatchField.VLAN_VID,
+                        OFVlanVidMatch.ofVlanVid(VlanVid.ofVlan(vid.vlanId().toShort())));
+                break;
+            case ARP_OP:
+            case ARP_SHA:
+            case ARP_SPA:
+            case ARP_THA:
+            case ARP_TPA:
+            case ICMPV4_CODE:
+            case ICMPV4_TYPE:
+            case ICMPV6_CODE:
+            case ICMPV6_TYPE:
+            case IN_PHY_PORT:
+            case IPV6_DST:
+            case IPV6_EXTHDR:
+            case IPV6_FLABEL:
+            case IPV6_ND_SLL:
+            case IPV6_ND_TARGET:
+            case IPV6_ND_TLL:
+            case IPV6_SRC:
+            case IP_DSCP:
+            case IP_ECN:
+            case METADATA:
+            case MPLS_BOS:
+            case MPLS_LABEL:
+            case MPLS_TC:
+            case PBB_ISID:
+            case SCTP_DST:
+            case SCTP_SRC:
+            case TCP_DST:
+            case TCP_SRC:
+            case TUNNEL_ID:
+            case UDP_DST:
+            case UDP_SRC:
+            default:
+                log.warn("Match type {} not yet implemented.", c.type());
+            }
+        }
+        return mBuilder.build();
+    }
+
+}