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 func (any *anyMessage) toRoutingMessage(b []byte) RoutingMessage {
  12         switch any.Type {
  13         case RTM_ADD, RTM_DELETE, RTM_CHANGE, RTM_GET, RTM_LOSING, RTM_REDIRECT, RTM_MISS, RTM_LOCK, RTM_RESOLVE:
  14                 p := (*RouteMessage)(unsafe.Pointer(any))
  15                 return &RouteMessage{Header: p.Header, Data: b[SizeofRtMsghdr:any.Msglen]}
  16         case RTM_IFINFO:
  17                 p := (*InterfaceMessage)(unsafe.Pointer(any))
  18                 return &InterfaceMessage{Header: p.Header, Data: b[SizeofIfMsghdr:any.Msglen]}
  19         case RTM_IFANNOUNCE:
  20                 p := (*InterfaceAnnounceMessage)(unsafe.Pointer(any))
  21                 return &InterfaceAnnounceMessage{Header: p.Header}
  22         case RTM_NEWADDR, RTM_DELADDR:
  23                 p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
  24                 return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]}
  25         case RTM_NEWMADDR, RTM_DELMADDR:
  26                 p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
  27                 return &InterfaceMulticastAddrMessage{Header: p.Header, Data: b[SizeofIfmaMsghdr:any.Msglen]}
  28         }
  29         return nil
  30 }
  31
  32 // InterfaceAnnounceMessage represents a routing message containing
  33 // network interface arrival and depature information.
  34 type InterfaceAnnounceMessage struct {
  35         Header IfAnnounceMsghdr
  36 }
  37
  38 func (m *InterfaceAnnounceMessage) sockaddr() (sas []Sockaddr) { return nil }
  39
  40 // InterfaceMulticastAddrMessage represents a routing message
  41 // containing network interface address entries.
  42 type InterfaceMulticastAddrMessage struct {
  43         Header IfmaMsghdr
  44         Data   []byte
  45 }
  46
  47 const rtaIfmaMask = RTA_GATEWAY | RTA_IFP | RTA_IFA
  48
  49 func (m *InterfaceMulticastAddrMessage) sockaddr() (sas []Sockaddr) {
  50         if m.Header.Addrs&rtaIfmaMask == 0 {
  51                 return nil
  52         }
  53         b := m.Data[:]
  54         for i := uint(0); i < RTAX_MAX; i++ {
  55                 if m.Header.Addrs&rtaIfmaMask&(1<<i) == 0 {
  56                         continue
  57                 }
  58                 rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
  59                 switch i {
  60                 case RTAX_IFA:
  61                         sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
  62                         if e != nil {
  63                                 return nil
  64                         }
  65                         sas = append(sas, sa)
  66                 case RTAX_GATEWAY, RTAX_IFP:
  67                         // nothing to do
  68                 }
  69                 b = b[rsaAlignOf(int(rsa.Len)):]
  70         }
  71         return sas
  72 }