forked from gitea/gitea
244 lines
7.7 KiB
Go
244 lines
7.7 KiB
Go
|
// 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 implements IP-level socket options for the Internet
|
||
|
|
// Protocol version 6.
|
||
|
|
//
|
||
|
|
// The package provides IP-level socket options that allow
|
||
|
|
// manipulation of IPv6 facilities.
|
||
|
|
//
|
||
|
|
// The IPv6 protocol is defined in RFC 8200.
|
||
|
|
// Socket interface extensions are defined in RFC 3493, RFC 3542 and
|
||
|
|
// RFC 3678.
|
||
|
|
// MLDv1 and MLDv2 are defined in RFC 2710 and RFC 3810.
|
||
|
|
// Source-specific multicast is defined in RFC 4607.
|
||
|
|
//
|
||
|
|
// On Darwin, this package requires OS X Mavericks version 10.9 or
|
||
|
|
// above, or equivalent.
|
||
|
|
//
|
||
|
|
//
|
||
|
|
// Unicasting
|
||
|
|
//
|
||
|
|
// The options for unicasting are available for net.TCPConn,
|
||
|
|
// net.UDPConn and net.IPConn which are created as network connections
|
||
|
|
// that use the IPv6 transport. When a single TCP connection carrying
|
||
|
|
// a data flow of multiple packets needs to indicate the flow is
|
||
|
|
// important, Conn is used to set the traffic class field on the IPv6
|
||
|
|
// header for each packet.
|
||
|
|
//
|
||
|
|
// ln, err := net.Listen("tcp6", "[::]:1024")
|
||
|
|
// if err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// defer ln.Close()
|
||
|
|
// for {
|
||
|
|
// c, err := ln.Accept()
|
||
|
|
// if err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// go func(c net.Conn) {
|
||
|
|
// defer c.Close()
|
||
|
|
//
|
||
|
|
// The outgoing packets will be labeled DiffServ assured forwarding
|
||
|
|
// class 1 low drop precedence, known as AF11 packets.
|
||
|
|
//
|
||
|
|
// if err := ipv6.NewConn(c).SetTrafficClass(0x28); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// if _, err := c.Write(data); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// }(c)
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
//
|
||
|
|
// Multicasting
|
||
|
|
//
|
||
|
|
// The options for multicasting are available for net.UDPConn and
|
||
|
|
// net.IPConn which are created as network connections that use the
|
||
|
|
// IPv6 transport. A few network facilities must be prepared before
|
||
|
|
// you begin multicasting, at a minimum joining network interfaces and
|
||
|
|
// multicast groups.
|
||
|
|
//
|
||
|
|
// en0, err := net.InterfaceByName("en0")
|
||
|
|
// if err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// en1, err := net.InterfaceByIndex(911)
|
||
|
|
// if err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// group := net.ParseIP("ff02::114")
|
||
|
|
//
|
||
|
|
// First, an application listens to an appropriate address with an
|
||
|
|
// appropriate service port.
|
||
|
|
//
|
||
|
|
// c, err := net.ListenPacket("udp6", "[::]:1024")
|
||
|
|
// if err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// defer c.Close()
|
||
|
|
//
|
||
|
|
// Second, the application joins multicast groups, starts listening to
|
||
|
|
// the groups on the specified network interfaces. Note that the
|
||
|
|
// service port for transport layer protocol does not matter with this
|
||
|
|
// operation as joining groups affects only network and link layer
|
||
|
|
// protocols, such as IPv6 and Ethernet.
|
||
|
|
//
|
||
|
|
// p := ipv6.NewPacketConn(c)
|
||
|
|
// if err := p.JoinGroup(en0, &net.UDPAddr{IP: group}); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// if err := p.JoinGroup(en1, &net.UDPAddr{IP: group}); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// The application might set per packet control message transmissions
|
||
|
|
// between the protocol stack within the kernel. When the application
|
||
|
|
// needs a destination address on an incoming packet,
|
||
|
|
// SetControlMessage of PacketConn is used to enable control message
|
||
|
|
// transmissions.
|
||
|
|
//
|
||
|
|
// if err := p.SetControlMessage(ipv6.FlagDst, true); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// The application could identify whether the received packets are
|
||
|
|
// of interest by using the control message that contains the
|
||
|
|
// destination address of the received packet.
|
||
|
|
//
|
||
|
|
// b := make([]byte, 1500)
|
||
|
|
// for {
|
||
|
|
// n, rcm, src, err := p.ReadFrom(b)
|
||
|
|
// if err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// if rcm.Dst.IsMulticast() {
|
||
|
|
// if rcm.Dst.Equal(group) {
|
||
|
|
// // joined group, do something
|
||
|
|
// } else {
|
||
|
|
// // unknown group, discard
|
||
|
|
// continue
|
||
|
|
// }
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// The application can also send both unicast and multicast packets.
|
||
|
|
//
|
||
|
|
// p.SetTrafficClass(0x0)
|
||
|
|
// p.SetHopLimit(16)
|
||
|
|
// if _, err := p.WriteTo(data[:n], nil, src); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// dst := &net.UDPAddr{IP: group, Port: 1024}
|
||
|
|
// wcm := ipv6.ControlMessage{TrafficClass: 0xe0, HopLimit: 1}
|
||
|
|
// for _, ifi := range []*net.Interface{en0, en1} {
|
||
|
|
// wcm.IfIndex = ifi.Index
|
||
|
|
// if _, err := p.WriteTo(data[:n], &wcm, dst); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// }
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
//
|
||
|
|
// More multicasting
|
||
|
|
//
|
||
|
|
// An application that uses PacketConn may join multiple multicast
|
||
|
|
// groups. For example, a UDP listener with port 1024 might join two
|
||
|
|
// different groups across over two different network interfaces by
|
||
|
|
// using:
|
||
|
|
//
|
||
|
|
// c, err := net.ListenPacket("udp6", "[::]:1024")
|
||
|
|
// if err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// defer c.Close()
|
||
|
|
// p := ipv6.NewPacketConn(c)
|
||
|
|
// if err := p.JoinGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff02::1:114")}); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// if err := p.JoinGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff02::2:114")}); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// if err := p.JoinGroup(en1, &net.UDPAddr{IP: net.ParseIP("ff02::2:114")}); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// It is possible for multiple UDP listeners that listen on the same
|
||
|
|
// UDP port to join the same multicast group. The net package will
|
||
|
|
// provide a socket that listens to a wildcard address with reusable
|
||
|
|
// UDP port when an appropriate multicast address prefix is passed to
|
||
|
|
// the net.ListenPacket or net.ListenUDP.
|
||
|
|
//
|
||
|
|
// c1, err := net.ListenPacket("udp6", "[ff02::]:1024")
|
||
|
|
// if err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// defer c1.Close()
|
||
|
|
// c2, err := net.ListenPacket("udp6", "[ff02::]:1024")
|
||
|
|
// if err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// defer c2.Close()
|
||
|
|
// p1 := ipv6.NewPacketConn(c1)
|
||
|
|
// if err := p1.JoinGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff02::114")}); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// p2 := ipv6.NewPacketConn(c2)
|
||
|
|
// if err := p2.JoinGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff02::114")}); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// Also it is possible for the application to leave or rejoin a
|
||
|
|
// multicast group on the network interface.
|
||
|
|
//
|
||
|
|
// if err := p.LeaveGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff02::114")}); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// if err := p.JoinGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff01::114")}); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
//
|
||
|
|
// Source-specific multicasting
|
||
|
|
//
|
||
|
|
// An application that uses PacketConn on MLDv2 supported platform is
|
||
|
|
// able to join source-specific multicast groups.
|
||
|
|
// The application may use JoinSourceSpecificGroup and
|
||
|
|
// LeaveSourceSpecificGroup for the operation known as "include" mode,
|
||
|
|
//
|
||
|
|
// ssmgroup := net.UDPAddr{IP: net.ParseIP("ff32::8000:9")}
|
||
|
|
// ssmsource := net.UDPAddr{IP: net.ParseIP("fe80::cafe")}
|
||
|
|
// if err := p.JoinSourceSpecificGroup(en0, &ssmgroup, &ssmsource); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// if err := p.LeaveSourceSpecificGroup(en0, &ssmgroup, &ssmsource); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// or JoinGroup, ExcludeSourceSpecificGroup,
|
||
|
|
// IncludeSourceSpecificGroup and LeaveGroup for the operation known
|
||
|
|
// as "exclude" mode.
|
||
|
|
//
|
||
|
|
// exclsource := net.UDPAddr{IP: net.ParseIP("fe80::dead")}
|
||
|
|
// if err := p.JoinGroup(en0, &ssmgroup); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// if err := p.ExcludeSourceSpecificGroup(en0, &ssmgroup, &exclsource); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
// if err := p.LeaveGroup(en0, &ssmgroup); err != nil {
|
||
|
|
// // error handling
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// Note that it depends on each platform implementation what happens
|
||
|
|
// when an application which runs on MLDv2 unsupported platform uses
|
||
|
|
// JoinSourceSpecificGroup and LeaveSourceSpecificGroup.
|
||
|
|
// In general the platform tries to fall back to conversations using
|
||
|
|
// MLDv1 and starts to listen to multicast traffic.
|
||
|
|
// In the fallback case, ExcludeSourceSpecificGroup and
|
||
|
|
// IncludeSourceSpecificGroup may return an error.
|
||
|
|
package ipv6 // import "golang.org/x/net/ipv6"
|
||
|
|
|
||
|
|
// BUG(mikio): This package is not implemented on JS, NaCl and Plan 9.
|