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// 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.
// +build darwin dragonfly freebsd linux netbsd openbsd
package ipv6
import (
"syscall"
"unsafe"
"golang.org/x/net/internal/iana"
)
func marshalTrafficClass(b []byte, cm *ControlMessage) []byte {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
m.Level = iana.ProtocolIPv6
m.Type = sysIPV6_TCLASS
m.SetLen(syscall.CmsgLen(4))
if cm != nil {
data := b[syscall.CmsgLen(0):]
// TODO(mikio): fix potential misaligned memory access
*(*int32)(unsafe.Pointer(&data[:4][0])) = int32(cm.TrafficClass)
}
return b[syscall.CmsgSpace(4):]
}
func parseTrafficClass(cm *ControlMessage, b []byte) {
// TODO(mikio): fix potential misaligned memory access
cm.TrafficClass = int(*(*int32)(unsafe.Pointer(&b[:4][0])))
}
func marshalHopLimit(b []byte, cm *ControlMessage) []byte {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
m.Level = iana.ProtocolIPv6
m.Type = sysIPV6_HOPLIMIT
m.SetLen(syscall.CmsgLen(4))
if cm != nil {
data := b[syscall.CmsgLen(0):]
// TODO(mikio): fix potential misaligned memory access
*(*int32)(unsafe.Pointer(&data[:4][0])) = int32(cm.HopLimit)
}
return b[syscall.CmsgSpace(4):]
}
func parseHopLimit(cm *ControlMessage, b []byte) {
// TODO(mikio): fix potential misaligned memory access
cm.HopLimit = int(*(*int32)(unsafe.Pointer(&b[:4][0])))
}
func marshalPacketInfo(b []byte, cm *ControlMessage) []byte {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
m.Level = iana.ProtocolIPv6
m.Type = sysIPV6_PKTINFO
m.SetLen(syscall.CmsgLen(sysSizeofInet6Pktinfo))
if cm != nil {
pi := (*sysInet6Pktinfo)(unsafe.Pointer(&b[syscall.CmsgLen(0)]))
if ip := cm.Src.To16(); ip != nil && ip.To4() == nil {
copy(pi.Addr[:], ip)
}
if cm.IfIndex > 0 {
pi.setIfindex(cm.IfIndex)
}
}
return b[syscall.CmsgSpace(sysSizeofInet6Pktinfo):]
}
func parsePacketInfo(cm *ControlMessage, b []byte) {
pi := (*sysInet6Pktinfo)(unsafe.Pointer(&b[0]))
cm.Dst = pi.Addr[:]
cm.IfIndex = int(pi.Ifindex)
}
func marshalNextHop(b []byte, cm *ControlMessage) []byte {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
m.Level = iana.ProtocolIPv6
m.Type = sysIPV6_NEXTHOP
m.SetLen(syscall.CmsgLen(sysSizeofSockaddrInet6))
if cm != nil {
sa := (*sysSockaddrInet6)(unsafe.Pointer(&b[syscall.CmsgLen(0)]))
sa.setSockaddr(cm.NextHop, cm.IfIndex)
}
return b[syscall.CmsgSpace(sysSizeofSockaddrInet6):]
}
func parseNextHop(cm *ControlMessage, b []byte) {
}
func marshalPathMTU(b []byte, cm *ControlMessage) []byte {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
m.Level = iana.ProtocolIPv6
m.Type = sysIPV6_PATHMTU
m.SetLen(syscall.CmsgLen(sysSizeofIPv6Mtuinfo))
return b[syscall.CmsgSpace(sysSizeofIPv6Mtuinfo):]
}
func parsePathMTU(cm *ControlMessage, b []byte) {
mi := (*sysIPv6Mtuinfo)(unsafe.Pointer(&b[0]))
cm.Dst = mi.Addr.Addr[:]
cm.IfIndex = int(mi.Addr.Scope_id)
cm.MTU = int(mi.Mtu)
}
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