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d2e5a1215d
Package ipv4 implements IP-level socket options for the Internet Protocol version 4. It also provides raw IP socket access methods including IPv4 header manipulation. Fixes golang/go#3684. Fixes golang/go#3820. This CL requires CL 6426047; net: add read, write message methods to IPConn, UDPConn R=rsc, dave, alex.brainman CC=gobot, golang-dev https://golang.org/cl/6482044
48 lines
1.4 KiB
Go
48 lines
1.4 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ipv4
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import (
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"fmt"
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"net"
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"sync"
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)
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type rawOpt struct {
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mu sync.Mutex
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cflags ControlFlags
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}
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func (o *rawOpt) lock() { o.mu.Lock() }
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func (o *rawOpt) unlock() { o.mu.Unlock() }
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func (o *rawOpt) set(f ControlFlags) { o.cflags |= f }
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func (o *rawOpt) clear(f ControlFlags) { o.cflags ^= f }
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func (o *rawOpt) isset(f ControlFlags) bool { return o.cflags&f != 0 }
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type ControlFlags uint
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const (
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FlagTTL ControlFlags = 1 << iota // pass the TTL on the received packet
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FlagSrc // pass the source address on the received packet
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FlagDst // pass the destination address on the received packet
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FlagInterface // pass the interface index on the received packet or outgoing packet
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)
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// A ControlMessage represents control information that contains per
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// packet IP-level option data.
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type ControlMessage struct {
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TTL int // time-to-live
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Src net.IP // source address
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Dst net.IP // destination address
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IfIndex int // interface index
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}
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func (cm *ControlMessage) String() string {
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if cm == nil {
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return "<nil>"
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}
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return fmt.Sprintf("ttl: %v, src: %v, dst: %v, ifindex: %v", cm.TTL, cm.Src, cm.Dst, cm.IfIndex)
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}
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