Create def sec group
diff --git a/openstack/compute/v2/extensions/defsecrules/requests.go b/openstack/compute/v2/extensions/defsecrules/requests.go
index 66337a5..2973cf0 100644
--- a/openstack/compute/v2/extensions/defsecrules/requests.go
+++ b/openstack/compute/v2/extensions/defsecrules/requests.go
@@ -1,6 +1,10 @@
 package defsecrules
 
 import (
+	"errors"
+
+	"github.com/racker/perigee"
+
 	"github.com/rackspace/gophercloud"
 	"github.com/rackspace/gophercloud/pagination"
 )
@@ -13,3 +17,69 @@
 
 	return pagination.NewPager(client, rootURL(client), createPage)
 }
+
+// CreateOpts represents the configuration for adding a new default rule.
+type CreateOpts struct {
+	// Required - the lower bound of the port range that will be opened.
+	FromPort int `json:"from_port"`
+
+	// Required - the upper bound of the port range that will be opened.
+	ToPort int `json:"to_port"`
+
+	// Required - the protocol type that will be allowed, e.g. TCP.
+	IPProtocol string `json:"ip_protocol"`
+
+	// ONLY required if FromGroupID is blank. This represents the IP range that
+	// will be the source of network traffic to your security group. Use
+	// 0.0.0.0/0 to allow all IP addresses.
+	CIDR string `json:"cidr,omitempty"`
+}
+
+// CreateRuleOptsBuilder builds the create rule options into a serializable format.
+type CreateOptsBuilder interface {
+	ToRuleCreateMap() (map[string]interface{}, error)
+}
+
+// ToRuleCreateMap builds the create rule options into a serializable format.
+func (opts CreateOpts) ToRuleCreateMap() (map[string]interface{}, error) {
+	rule := make(map[string]interface{})
+
+	if opts.FromPort == 0 {
+		return rule, errors.New("A FromPort must be set")
+	}
+	if opts.ToPort == 0 {
+		return rule, errors.New("A ToPort must be set")
+	}
+	if opts.IPProtocol == "" {
+		return rule, errors.New("A IPProtocol must be set")
+	}
+	if opts.CIDR == "" {
+		return rule, errors.New("A CIDR must be set")
+	}
+
+	rule["from_port"] = opts.FromPort
+	rule["to_port"] = opts.ToPort
+	rule["ip_protocol"] = opts.IPProtocol
+	rule["cidr"] = opts.CIDR
+
+	return map[string]interface{}{"security_group_default_rule": rule}, nil
+}
+
+func Create(client *gophercloud.ServiceClient, opts CreateOptsBuilder) CreateResult {
+	var result CreateResult
+
+	reqBody, err := opts.ToRuleCreateMap()
+	if err != nil {
+		result.Err = err
+		return result
+	}
+
+	_, result.Err = perigee.Request("POST", rootURL(client), perigee.Options{
+		Results:     &result.Body,
+		ReqBody:     &reqBody,
+		MoreHeaders: client.AuthenticatedHeaders(),
+		OkCodes:     []int{200},
+	})
+
+	return result
+}