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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 FreeBSD
package syscall
import "unsafe"
// See http://www.freebsd.org/doc/en/books/porters-handbook/freebsd-versions.html.
var freebsdVersion uint32
func init() {
freebsdVersion, _ = SysctlUint32("kern.osreldate")
}
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:
return any.parseInterfaceMessage(b)
case RTM_IFANNOUNCE:
p := (*InterfaceAnnounceMessage)(unsafe.Pointer(any))
return &InterfaceAnnounceMessage{Header: p.Header}
case RTM_NEWADDR, RTM_DELADDR:
p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]}
case RTM_NEWMADDR, RTM_DELMADDR:
p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
return &InterfaceMulticastAddrMessage{Header: p.Header, Data: b[SizeofIfmaMsghdr:any.Msglen]}
}
return nil
}
// InterfaceAnnounceMessage represents a routing message containing
// network interface arrival and departure information.
type InterfaceAnnounceMessage struct {
Header IfAnnounceMsghdr
}
func (m *InterfaceAnnounceMessage) sockaddr() (sas []Sockaddr) { return nil }
// InterfaceMulticastAddrMessage represents a routing message
// containing network interface address entries.
type InterfaceMulticastAddrMessage struct {
Header IfmaMsghdr
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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