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// 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"
"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, errInvalidConn
}
so, ok := sockOpts[ssoMulticastTTL]
if !ok {
return 0, errNotImplemented
}
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 errInvalidConn
}
so, ok := sockOpts[ssoMulticastTTL]
if !ok {
return errNotImplemented
}
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, errInvalidConn
}
so, ok := sockOpts[ssoMulticastInterface]
if !ok {
return nil, errNotImplemented
}
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 errInvalidConn
}
so, ok := sockOpts[ssoMulticastInterface]
if !ok {
return errNotImplemented
}
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, errInvalidConn
}
so, ok := sockOpts[ssoMulticastLoopback]
if !ok {
return false, errNotImplemented
}
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 errInvalidConn
}
so, ok := sockOpts[ssoMulticastLoopback]
if !ok {
return errNotImplemented
}
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 errInvalidConn
}
so, ok := sockOpts[ssoJoinGroup]
if !ok {
return errNotImplemented
}
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 errInvalidConn
}
so, ok := sockOpts[ssoLeaveGroup]
if !ok {
return errNotImplemented
}
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 errInvalidConn
}
so, ok := sockOpts[ssoJoinSourceGroup]
if !ok {
return errNotImplemented
}
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 errInvalidConn
}
so, ok := sockOpts[ssoLeaveSourceGroup]
if !ok {
return errNotImplemented
}
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 errInvalidConn
}
so, ok := sockOpts[ssoBlockSourceGroup]
if !ok {
return errNotImplemented
}
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 errInvalidConn
}
so, ok := sockOpts[ssoUnblockSourceGroup]
if !ok {
return errNotImplemented
}
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, errInvalidConn
}
so, ok := sockOpts[ssoICMPFilter]
if !ok {
return nil, errNotImplemented
}
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 errInvalidConn
}
so, ok := sockOpts[ssoICMPFilter]
if !ok {
return errNotImplemented
}
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 errInvalidConn
}
so, ok := sockOpts[ssoAttachFilter]
if !ok {
return errNotImplemented
}
return so.setBPF(c.Conn, filter)
}
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