diff --git a/unum/vendor/golang.org/x/net/ipv6/dgramopt.go b/unum/vendor/golang.org/x/net/ipv6/dgramopt.go
new file mode 100644
index 0000000..703dafe
--- /dev/null
+++ b/unum/vendor/golang.org/x/net/ipv6/dgramopt.go
@@ -0,0 +1,302 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ipv6
+
+import (
+	"net"
+	"syscall"
+
+	"golang.org/x/net/bpf"
+)
+
+// MulticastHopLimit returns the hop limit field value for outgoing
+// multicast packets.
+func (c *dgramOpt) MulticastHopLimit() (int, error) {
+	if !c.ok() {
+		return 0, syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoMulticastHopLimit]
+	if !ok {
+		return 0, errOpNoSupport
+	}
+	return so.GetInt(c.Conn)
+}
+
+// SetMulticastHopLimit sets the hop limit field value for future
+// outgoing multicast packets.
+func (c *dgramOpt) SetMulticastHopLimit(hoplim int) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoMulticastHopLimit]
+	if !ok {
+		return errOpNoSupport
+	}
+	return so.SetInt(c.Conn, hoplim)
+}
+
+// MulticastInterface returns the default interface for multicast
+// packet transmissions.
+func (c *dgramOpt) MulticastInterface() (*net.Interface, error) {
+	if !c.ok() {
+		return nil, syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoMulticastInterface]
+	if !ok {
+		return nil, errOpNoSupport
+	}
+	return so.getMulticastInterface(c.Conn)
+}
+
+// SetMulticastInterface sets the default interface for future
+// multicast packet transmissions.
+func (c *dgramOpt) SetMulticastInterface(ifi *net.Interface) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoMulticastInterface]
+	if !ok {
+		return errOpNoSupport
+	}
+	return so.setMulticastInterface(c.Conn, ifi)
+}
+
+// MulticastLoopback reports whether transmitted multicast packets
+// should be copied and send back to the originator.
+func (c *dgramOpt) MulticastLoopback() (bool, error) {
+	if !c.ok() {
+		return false, syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoMulticastLoopback]
+	if !ok {
+		return false, errOpNoSupport
+	}
+	on, err := so.GetInt(c.Conn)
+	if err != nil {
+		return false, err
+	}
+	return on == 1, nil
+}
+
+// SetMulticastLoopback sets whether transmitted multicast packets
+// should be copied and send back to the originator.
+func (c *dgramOpt) SetMulticastLoopback(on bool) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoMulticastLoopback]
+	if !ok {
+		return errOpNoSupport
+	}
+	return so.SetInt(c.Conn, boolint(on))
+}
+
+// JoinGroup joins the group address group on the interface ifi.
+// By default all sources that can cast data to group are accepted.
+// It's possible to mute and unmute data transmission from a specific
+// source by using ExcludeSourceSpecificGroup and
+// IncludeSourceSpecificGroup.
+// JoinGroup uses the system assigned multicast interface when ifi is
+// nil, although this is not recommended because the assignment
+// depends on platforms and sometimes it might require routing
+// configuration.
+func (c *dgramOpt) JoinGroup(ifi *net.Interface, group net.Addr) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoJoinGroup]
+	if !ok {
+		return errOpNoSupport
+	}
+	grp := netAddrToIP16(group)
+	if grp == nil {
+		return errMissingAddress
+	}
+	return so.setGroup(c.Conn, ifi, grp)
+}
+
+// LeaveGroup leaves the group address group on the interface ifi
+// regardless of whether the group is any-source group or
+// source-specific group.
+func (c *dgramOpt) LeaveGroup(ifi *net.Interface, group net.Addr) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoLeaveGroup]
+	if !ok {
+		return errOpNoSupport
+	}
+	grp := netAddrToIP16(group)
+	if grp == nil {
+		return errMissingAddress
+	}
+	return so.setGroup(c.Conn, ifi, grp)
+}
+
+// JoinSourceSpecificGroup joins the source-specific group comprising
+// group and source on the interface ifi.
+// JoinSourceSpecificGroup uses the system assigned multicast
+// interface when ifi is nil, although this is not recommended because
+// the assignment depends on platforms and sometimes it might require
+// routing configuration.
+func (c *dgramOpt) JoinSourceSpecificGroup(ifi *net.Interface, group, source net.Addr) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoJoinSourceGroup]
+	if !ok {
+		return errOpNoSupport
+	}
+	grp := netAddrToIP16(group)
+	if grp == nil {
+		return errMissingAddress
+	}
+	src := netAddrToIP16(source)
+	if src == nil {
+		return errMissingAddress
+	}
+	return so.setSourceGroup(c.Conn, ifi, grp, src)
+}
+
+// LeaveSourceSpecificGroup leaves the source-specific group on the
+// interface ifi.
+func (c *dgramOpt) LeaveSourceSpecificGroup(ifi *net.Interface, group, source net.Addr) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoLeaveSourceGroup]
+	if !ok {
+		return errOpNoSupport
+	}
+	grp := netAddrToIP16(group)
+	if grp == nil {
+		return errMissingAddress
+	}
+	src := netAddrToIP16(source)
+	if src == nil {
+		return errMissingAddress
+	}
+	return so.setSourceGroup(c.Conn, ifi, grp, src)
+}
+
+// ExcludeSourceSpecificGroup excludes the source-specific group from
+// the already joined any-source groups by JoinGroup on the interface
+// ifi.
+func (c *dgramOpt) ExcludeSourceSpecificGroup(ifi *net.Interface, group, source net.Addr) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoBlockSourceGroup]
+	if !ok {
+		return errOpNoSupport
+	}
+	grp := netAddrToIP16(group)
+	if grp == nil {
+		return errMissingAddress
+	}
+	src := netAddrToIP16(source)
+	if src == nil {
+		return errMissingAddress
+	}
+	return so.setSourceGroup(c.Conn, ifi, grp, src)
+}
+
+// IncludeSourceSpecificGroup includes the excluded source-specific
+// group by ExcludeSourceSpecificGroup again on the interface ifi.
+func (c *dgramOpt) IncludeSourceSpecificGroup(ifi *net.Interface, group, source net.Addr) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoUnblockSourceGroup]
+	if !ok {
+		return errOpNoSupport
+	}
+	grp := netAddrToIP16(group)
+	if grp == nil {
+		return errMissingAddress
+	}
+	src := netAddrToIP16(source)
+	if src == nil {
+		return errMissingAddress
+	}
+	return so.setSourceGroup(c.Conn, ifi, grp, src)
+}
+
+// Checksum reports whether the kernel will compute, store or verify a
+// checksum for both incoming and outgoing packets. If on is true, it
+// returns an offset in bytes into the data of where the checksum
+// field is located.
+func (c *dgramOpt) Checksum() (on bool, offset int, err error) {
+	if !c.ok() {
+		return false, 0, syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoChecksum]
+	if !ok {
+		return false, 0, errOpNoSupport
+	}
+	offset, err = so.GetInt(c.Conn)
+	if err != nil {
+		return false, 0, err
+	}
+	if offset < 0 {
+		return false, 0, nil
+	}
+	return true, offset, nil
+}
+
+// SetChecksum enables the kernel checksum processing. If on is ture,
+// the offset should be an offset in bytes into the data of where the
+// checksum field is located.
+func (c *dgramOpt) SetChecksum(on bool, offset int) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoChecksum]
+	if !ok {
+		return errOpNoSupport
+	}
+	if !on {
+		offset = -1
+	}
+	return so.SetInt(c.Conn, offset)
+}
+
+// ICMPFilter returns an ICMP filter.
+func (c *dgramOpt) ICMPFilter() (*ICMPFilter, error) {
+	if !c.ok() {
+		return nil, syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoICMPFilter]
+	if !ok {
+		return nil, errOpNoSupport
+	}
+	return so.getICMPFilter(c.Conn)
+}
+
+// SetICMPFilter deploys the ICMP filter.
+func (c *dgramOpt) SetICMPFilter(f *ICMPFilter) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoICMPFilter]
+	if !ok {
+		return errOpNoSupport
+	}
+	return so.setICMPFilter(c.Conn, f)
+}
+
+// SetBPF attaches a BPF program to the connection.
+//
+// Only supported on Linux.
+func (c *dgramOpt) SetBPF(filter []bpf.RawInstruction) error {
+	if !c.ok() {
+		return syscall.EINVAL
+	}
+	so, ok := sockOpts[ssoAttachFilter]
+	if !ok {
+		return errOpNoSupport
+	}
+	return so.setBPF(c.Conn, filter)
+}