mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
85 lines
3.1 KiB
Go
85 lines
3.1 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
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"net"
|
|
"sync"
|
|
)
|
|
|
|
var (
|
|
errNotSupported = errors.New("not supported")
|
|
errMissingAddress = errors.New("missing address")
|
|
errInvalidConnType = errors.New("invalid conn type")
|
|
errNoSuchInterface = errors.New("no such interface")
|
|
)
|
|
|
|
// References:
|
|
//
|
|
// RFC 2292 Advanced Sockets API for IPv6
|
|
// http://tools.ietf.org/html/rfc2292
|
|
// RFC 2460 Internet Protocol, Version 6 (IPv6) Specification
|
|
// http://tools.ietf.org/html/rfc2460
|
|
// RFC 3493 Basic Socket Interface Extensions for IPv6
|
|
// http://tools.ietf.org/html/rfc3493.html
|
|
// RFC 3542 Advanced Sockets Application Program Interface (API) for IPv6
|
|
// http://tools.ietf.org/html/rfc3542
|
|
//
|
|
// Note that RFC 3542 obsoltes RFC 2292 but OS X Snow Leopard and the
|
|
// former still support RFC 2292 only. Please be aware that almost
|
|
// all protocol implementations prohibit using a combination of RFC
|
|
// 2292 and RFC 3542 for some practical reasons.
|
|
|
|
type rawOpt struct {
|
|
sync.Mutex
|
|
cflags ControlFlags
|
|
}
|
|
|
|
func (c *rawOpt) set(f ControlFlags) { c.cflags |= f }
|
|
func (c *rawOpt) clear(f ControlFlags) { c.cflags &^= f }
|
|
func (c *rawOpt) isset(f ControlFlags) bool { return c.cflags&f != 0 }
|
|
|
|
// A ControlFlags reprensents per packet basis IP-level socket option
|
|
// control flags.
|
|
type ControlFlags uint
|
|
|
|
const (
|
|
FlagTrafficClass ControlFlags = 1 << iota // pass the traffic class on the received packet
|
|
FlagHopLimit // pass the hop limit on the received packet
|
|
FlagSrc // pass the source address on the received packet
|
|
FlagDst // pass the destination address on the received packet
|
|
FlagInterface // pass the interface index on the received packet
|
|
FlagPathMTU // pass the path MTU on the received packet path
|
|
)
|
|
|
|
// A ControlMessage represents per packet basis IP-level socket
|
|
// options.
|
|
type ControlMessage struct {
|
|
// Receiving socket options: SetControlMessage allows to
|
|
// receive the options from the protocol stack using ReadFrom
|
|
// method of PacketConn.
|
|
//
|
|
// Specifying socket options: ControlMessage for WriteTo
|
|
// method of PacketConn allows to send the options to the
|
|
// protocol stack.
|
|
//
|
|
TrafficClass int // traffic class, must be 1 <= value <= 255 when specifying
|
|
HopLimit int // hop limit, must be 1 <= value <= 255 when specifying
|
|
Src net.IP // source address, specifying only
|
|
Dst net.IP // destination address, receiving only
|
|
IfIndex int // interface index, must be 1 <= value when specifying
|
|
NextHop net.IP // next hop address, specifying only
|
|
MTU int // path MTU, receiving only
|
|
}
|
|
|
|
func (cm *ControlMessage) String() string {
|
|
if cm == nil {
|
|
return "<nil>"
|
|
}
|
|
return fmt.Sprintf("tclass: %#x, hoplim: %v, src: %v, dst: %v, ifindex: %v, nexthop: %v, mtu: %v", cm.TrafficClass, cm.HopLimit, cm.Src, cm.Dst, cm.IfIndex, cm.NextHop, cm.MTU)
|
|
}
|