--- /dev/null
+// Copyright 2012 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 ipv4
+
+import (
+ "net"
+ "syscall"
+
+ "golang.org/x/net/bpf"
+)
+
+// MulticastTTL returns the time-to-live field value for outgoing
+// multicast packets.
+func (c *dgramOpt) MulticastTTL() (int, error) {
+ if !c.ok() {
+ return 0, syscall.EINVAL
+ }
+ so, ok := sockOpts[ssoMulticastTTL]
+ if !ok {
+ return 0, errOpNoSupport
+ }
+ return so.GetInt(c.Conn)
+}
+
+// SetMulticastTTL sets the time-to-live field value for future
+// outgoing multicast packets.
+func (c *dgramOpt) SetMulticastTTL(ttl int) error {
+ if !c.ok() {
+ return syscall.EINVAL
+ }
+ so, ok := sockOpts[ssoMulticastTTL]
+ if !ok {
+ return errOpNoSupport
+ }
+ return so.SetInt(c.Conn, ttl)
+}
+
+// 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 := netAddrToIP4(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 := netAddrToIP4(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 := netAddrToIP4(group)
+ if grp == nil {
+ return errMissingAddress
+ }
+ src := netAddrToIP4(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 := netAddrToIP4(group)
+ if grp == nil {
+ return errMissingAddress
+ }
+ src := netAddrToIP4(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 := netAddrToIP4(group)
+ if grp == nil {
+ return errMissingAddress
+ }
+ src := netAddrToIP4(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 := netAddrToIP4(group)
+ if grp == nil {
+ return errMissingAddress
+ }
+ src := netAddrToIP4(source)
+ if src == nil {
+ return errMissingAddress
+ }
+ return so.setSourceGroup(c.Conn, ifi, grp, src)
+}
+
+// ICMPFilter returns an ICMP filter.
+// Currently only Linux supports this.
+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.
+// Currently only Linux supports this.
+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)
+}
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