mirror of
https://github.com/golang/go
synced 2024-10-05 18:31:28 -06:00
322214cf54
This CL reduces unnecessary network facility lookups introduced by recent changes below. changeset: 15798:53a4da6a4f4a net: return correct point-to-point interface address on linux changeset: 15799:a81ef8e0cc05 net: set up IPv6 scoped addressing zone for network facilities Also adds a test case for issue 4839. Benchmark results on linux/amd64, virtual machine: benchmark old ns/op new ns/op delta BenchmarkInterfaces-2 80487 80382 -0.13% BenchmarkInterfaceByIndex-2 72013 71391 -0.86% BenchmarkInterfaceByName-2 79865 80101 +0.30% BenchmarkInterfaceAddrs-2 42071 829677 +1872.09% BenchmarkInterfacesAndAddrs-2 35016 607622 +1635.27% BenchmarkInterfacesAndMulticastAddrs-2 169849 169082 -0.45% old: 15797:9c3930413c1b, new: tip Benchmark results on linux/amd64, virtual machine: benchmark old ns/op new ns/op delta BenchmarkInterfaces-2 80487 81459 +1.21% BenchmarkInterfaceByIndex-2 72013 71512 -0.70% BenchmarkInterfaceByName-2 79865 80567 +0.88% BenchmarkInterfaceAddrs-2 42071 120108 +185.49% BenchmarkInterfacesAndAddrs-2 35016 33259 -5.02% BenchmarkInterfacesAndMulticastAddrs-2 169849 82391 -51.49% old: 15797:9c3930413c1b, new: tip+CL7400055 Benchmark results on darwin/amd64: benchmark old ns/op new ns/op delta BenchmarkInterfaces-2 34402 34231 -0.50% BenchmarkInterfaceByIndex-2 13192 12956 -1.79% BenchmarkInterfaceByName-2 34791 34388 -1.16% BenchmarkInterfaceAddrs-2 36565 63906 +74.77% BenchmarkInterfacesAndAddrs-2 17497 31068 +77.56% BenchmarkInterfacesAndMulticastAddrs-2 25276 66711 +163.93% old: 15797:9c3930413c1b, new: tip Benchmark results on darwin/amd64: benchmark old ns/op new ns/op delta BenchmarkInterfaces-2 34402 31854 -7.41% BenchmarkInterfaceByIndex-2 13192 12950 -1.83% BenchmarkInterfaceByName-2 34791 31926 -8.23% BenchmarkInterfaceAddrs-2 36565 42144 +15.26% BenchmarkInterfacesAndAddrs-2 17497 17329 -0.96% BenchmarkInterfacesAndMulticastAddrs-2 25276 24870 -1.61% old: 15797:9c3930413c1b, new: tip+CL7400055 Update #4234. Fixes #4839 (again). Fixes #4866. R=golang-dev, fullung CC=golang-dev https://golang.org/cl/7400055
127 lines
3.3 KiB
Go
127 lines
3.3 KiB
Go
// Copyright 2011 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 net
|
|
|
|
import "errors"
|
|
|
|
var (
|
|
errInvalidInterface = errors.New("net: invalid interface")
|
|
errInvalidInterfaceIndex = errors.New("net: invalid interface index")
|
|
errInvalidInterfaceName = errors.New("net: invalid interface name")
|
|
errNoSuchInterface = errors.New("net: no such interface")
|
|
errNoSuchMulticastInterface = errors.New("net: no such multicast interface")
|
|
)
|
|
|
|
// Interface represents a mapping between network interface name
|
|
// and index. It also represents network interface facility
|
|
// information.
|
|
type Interface struct {
|
|
Index int // positive integer that starts at one, zero is never used
|
|
MTU int // maximum transmission unit
|
|
Name string // e.g., "en0", "lo0", "eth0.100"
|
|
HardwareAddr HardwareAddr // IEEE MAC-48, EUI-48 and EUI-64 form
|
|
Flags Flags // e.g., FlagUp, FlagLoopback, FlagMulticast
|
|
}
|
|
|
|
type Flags uint
|
|
|
|
const (
|
|
FlagUp Flags = 1 << iota // interface is up
|
|
FlagBroadcast // interface supports broadcast access capability
|
|
FlagLoopback // interface is a loopback interface
|
|
FlagPointToPoint // interface belongs to a point-to-point link
|
|
FlagMulticast // interface supports multicast access capability
|
|
)
|
|
|
|
var flagNames = []string{
|
|
"up",
|
|
"broadcast",
|
|
"loopback",
|
|
"pointtopoint",
|
|
"multicast",
|
|
}
|
|
|
|
func (f Flags) String() string {
|
|
s := ""
|
|
for i, name := range flagNames {
|
|
if f&(1<<uint(i)) != 0 {
|
|
if s != "" {
|
|
s += "|"
|
|
}
|
|
s += name
|
|
}
|
|
}
|
|
if s == "" {
|
|
s = "0"
|
|
}
|
|
return s
|
|
}
|
|
|
|
// Addrs returns interface addresses for a specific interface.
|
|
func (ifi *Interface) Addrs() ([]Addr, error) {
|
|
if ifi == nil {
|
|
return nil, errInvalidInterface
|
|
}
|
|
return interfaceAddrTable(ifi)
|
|
}
|
|
|
|
// MulticastAddrs returns multicast, joined group addresses for
|
|
// a specific interface.
|
|
func (ifi *Interface) MulticastAddrs() ([]Addr, error) {
|
|
if ifi == nil {
|
|
return nil, errInvalidInterface
|
|
}
|
|
return interfaceMulticastAddrTable(ifi)
|
|
}
|
|
|
|
// Interfaces returns a list of the system's network interfaces.
|
|
func Interfaces() ([]Interface, error) {
|
|
return interfaceTable(0)
|
|
}
|
|
|
|
// InterfaceAddrs returns a list of the system's network interface
|
|
// addresses.
|
|
func InterfaceAddrs() ([]Addr, error) {
|
|
return interfaceAddrTable(nil)
|
|
}
|
|
|
|
// InterfaceByIndex returns the interface specified by index.
|
|
func InterfaceByIndex(index int) (*Interface, error) {
|
|
if index <= 0 {
|
|
return nil, errInvalidInterfaceIndex
|
|
}
|
|
ift, err := interfaceTable(index)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return interfaceByIndex(ift, index)
|
|
}
|
|
|
|
func interfaceByIndex(ift []Interface, index int) (*Interface, error) {
|
|
for _, ifi := range ift {
|
|
if index == ifi.Index {
|
|
return &ifi, nil
|
|
}
|
|
}
|
|
return nil, errNoSuchInterface
|
|
}
|
|
|
|
// InterfaceByName returns the interface specified by name.
|
|
func InterfaceByName(name string) (*Interface, error) {
|
|
if name == "" {
|
|
return nil, errInvalidInterfaceName
|
|
}
|
|
ift, err := interfaceTable(0)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, ifi := range ift {
|
|
if name == ifi.Name {
|
|
return &ifi, nil
|
|
}
|
|
}
|
|
return nil, errNoSuchInterface
|
|
}
|