libgo/go/syscall/route_freebsd.go

   1 // Copyright 2011 The Go Authors.  All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // Routing sockets and messages for FreeBSD
   6
   7 package syscall
   8
   9 import "unsafe"
  10
  11 // See http://www.freebsd.org/doc/en/books/porters-handbook/freebsd-versions.html.
  12 var freebsdVersion uint32
  13
  14 func init() {
  15         freebsdVersion, _ = SysctlUint32("kern.osreldate")
  16 }
  17
  18 func (any *anyMessage) toRoutingMessage(b []byte) RoutingMessage {
  19         switch any.Type {
  20         case RTM_ADD, RTM_DELETE, RTM_CHANGE, RTM_GET, RTM_LOSING, RTM_REDIRECT, RTM_MISS, RTM_LOCK, RTM_RESOLVE:
  21                 p := (*RouteMessage)(unsafe.Pointer(any))
  22                 return &RouteMessage{Header: p.Header, Data: b[SizeofRtMsghdr:any.Msglen]}
  23         case RTM_IFINFO:
  24                 return any.parseInterfaceMessage(b)
  25         case RTM_IFANNOUNCE:
  26                 p := (*InterfaceAnnounceMessage)(unsafe.Pointer(any))
  27                 return &InterfaceAnnounceMessage{Header: p.Header}
  28         case RTM_NEWADDR, RTM_DELADDR:
  29                 p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
  30                 return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]}
  31         case RTM_NEWMADDR, RTM_DELMADDR:
  32                 p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
  33                 return &InterfaceMulticastAddrMessage{Header: p.Header, Data: b[SizeofIfmaMsghdr:any.Msglen]}
  34         }
  35         return nil
  36 }
  37
  38 // InterfaceAnnounceMessage represents a routing message containing
  39 // network interface arrival and departure information.
  40 type InterfaceAnnounceMessage struct {
  41         Header IfAnnounceMsghdr
  42 }
  43
  44 func (m *InterfaceAnnounceMessage) sockaddr() (sas []Sockaddr) { return nil }
  45
  46 // InterfaceMulticastAddrMessage represents a routing message
  47 // containing network interface address entries.
  48 type InterfaceMulticastAddrMessage struct {
  49         Header IfmaMsghdr
  50         Data   []byte
  51 }
  52
  53 const rtaIfmaMask = RTA_GATEWAY | RTA_IFP | RTA_IFA
  54
  55 func (m *InterfaceMulticastAddrMessage) sockaddr() (sas []Sockaddr) {
  56         if m.Header.Addrs&rtaIfmaMask == 0 {
  57                 return nil
  58         }
  59         b := m.Data[:]
  60         for i := uint(0); i < RTAX_MAX; i++ {
  61                 if m.Header.Addrs&rtaIfmaMask&(1<<i) == 0 {
  62                         continue
  63                 }
  64                 rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
  65                 switch i {
  66                 case RTAX_IFA:
  67                         sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
  68                         if e != nil {
  69                                 return nil
  70                         }
  71                         sas = append(sas, sa)
  72                 case RTAX_GATEWAY, RTAX_IFP:
  73                         // nothing to do
  74                 }
  75                 b = b[rsaAlignOf(int(rsa.Len)):]
  76         }
  77         return sas
  78 }