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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 solaris
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):]
nativeEndian.PutUint32(data[:4], uint32(cm.TrafficClass))
}
return b[syscall.CmsgSpace(4):]
}
func parseTrafficClass(cm *ControlMessage, b []byte) {
cm.TrafficClass = int(nativeEndian.Uint32(b[:4]))
}
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):]
nativeEndian.PutUint32(data[:4], uint32(cm.HopLimit))
}
return b[syscall.CmsgSpace(4):]
}
func parseHopLimit(cm *ControlMessage, b []byte) {
cm.HopLimit = int(nativeEndian.Uint32(b[:4]))
}
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(sizeofInet6Pktinfo))
if cm != nil {
pi := (*inet6Pktinfo)(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(sizeofInet6Pktinfo):]
}
func parsePacketInfo(cm *ControlMessage, b []byte) {
pi := (*inet6Pktinfo)(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(sizeofSockaddrInet6))
if cm != nil {
sa := (*sockaddrInet6)(unsafe.Pointer(&b[syscall.CmsgLen(0)]))
sa.setSockaddr(cm.NextHop, cm.IfIndex)
}
return b[syscall.CmsgSpace(sizeofSockaddrInet6):]
}
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(sizeofIPv6Mtuinfo))
return b[syscall.CmsgSpace(sizeofIPv6Mtuinfo):]
}
func parsePathMTU(cm *ControlMessage, b []byte) {
mi := (*ipv6Mtuinfo)(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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