forked from mystiq/dex
57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
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// Copyright 2013 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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// +build darwin
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package ipv6
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import (
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"syscall"
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"unsafe"
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"golang.org/x/net/internal/iana"
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)
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func marshal2292HopLimit(b []byte, cm *ControlMessage) []byte {
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m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
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m.Level = iana.ProtocolIPv6
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m.Type = sysIPV6_2292HOPLIMIT
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m.SetLen(syscall.CmsgLen(4))
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if cm != nil {
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data := b[syscall.CmsgLen(0):]
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// TODO(mikio): fix potential misaligned memory access
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*(*int32)(unsafe.Pointer(&data[:4][0])) = int32(cm.HopLimit)
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}
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return b[syscall.CmsgSpace(4):]
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}
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func marshal2292PacketInfo(b []byte, cm *ControlMessage) []byte {
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m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
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m.Level = iana.ProtocolIPv6
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m.Type = sysIPV6_2292PKTINFO
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m.SetLen(syscall.CmsgLen(sysSizeofInet6Pktinfo))
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if cm != nil {
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pi := (*sysInet6Pktinfo)(unsafe.Pointer(&b[syscall.CmsgLen(0)]))
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if ip := cm.Src.To16(); ip != nil && ip.To4() == nil {
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copy(pi.Addr[:], ip)
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}
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if cm.IfIndex > 0 {
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pi.setIfindex(cm.IfIndex)
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}
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}
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return b[syscall.CmsgSpace(sysSizeofInet6Pktinfo):]
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}
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func marshal2292NextHop(b []byte, cm *ControlMessage) []byte {
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m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
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m.Level = iana.ProtocolIPv6
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m.Type = sysIPV6_2292NEXTHOP
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m.SetLen(syscall.CmsgLen(sysSizeofSockaddrInet6))
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if cm != nil {
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sa := (*sysSockaddrInet6)(unsafe.Pointer(&b[syscall.CmsgLen(0)]))
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sa.setSockaddr(cm.NextHop, cm.IfIndex)
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}
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return b[syscall.CmsgSpace(sysSizeofSockaddrInet6):]
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}
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