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// 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.
// Routing sockets and messages for Darwin
package syscall
import "unsafe"
func (any *anyMessage) toRoutingMessage(b []byte) RoutingMessage {
switch any.Type {
case RTM_ADD, RTM_DELETE, RTM_CHANGE, RTM_GET, RTM_LOSING, RTM_REDIRECT, RTM_MISS, RTM_LOCK, RTM_RESOLVE:
p := (*RouteMessage)(unsafe.Pointer(any))
return &RouteMessage{Header: p.Header, Data: b[SizeofRtMsghdr:any.Msglen]}
case RTM_IFINFO:
p := (*InterfaceMessage)(unsafe.Pointer(any))
return &InterfaceMessage{Header: p.Header, Data: b[SizeofIfMsghdr:any.Msglen]}
case RTM_NEWADDR, RTM_DELADDR:
p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]}
case RTM_NEWMADDR2, RTM_DELMADDR:
p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
return &InterfaceMulticastAddrMessage{Header: p.Header, Data: b[SizeofIfmaMsghdr2:any.Msglen]}
}
return nil
}
// InterfaceMulticastAddrMessage represents a routing message
// containing network interface address entries.
type InterfaceMulticastAddrMessage struct {
Header IfmaMsghdr2
Data []byte
}
const rtaIfmaMask = RTA_GATEWAY | RTA_IFP | RTA_IFA
func (m *InterfaceMulticastAddrMessage) sockaddr() (sas []Sockaddr) {
if m.Header.Addrs&rtaIfmaMask == 0 {
return nil
}
b := m.Data[:]
for i := uint(0); i < RTAX_MAX; i++ {
if m.Header.Addrs&rtaIfmaMask&(1<<i) == 0 {
continue
}
rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
switch i {
case RTAX_IFA:
sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
if e != nil {
return nil
}
sas = append(sas, sa)
case RTAX_GATEWAY, RTAX_IFP:
// nothing to do
}
b = b[rsaAlignOf(int(rsa.Len)):]
}
return sas
}
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