libgo/go/syscall/route_darwin.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 Darwin
   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_NEWADDR, RTM_DELADDR:
  20                 p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
  21                 return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]}
  22         case RTM_NEWMADDR2, RTM_DELMADDR:
  23                 p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
  24                 return &InterfaceMulticastAddrMessage{Header: p.Header, Data: b[SizeofIfmaMsghdr2:any.Msglen]}
  25         }
  26         return nil
  27 }
  28
  29 // InterfaceMulticastAddrMessage represents a routing message
  30 // containing network interface address entries.
  31 type InterfaceMulticastAddrMessage struct {
  32         Header IfmaMsghdr2
  33         Data   []byte
  34 }
  35
  36 const rtaIfmaMask = RTA_GATEWAY | RTA_IFP | RTA_IFA
  37
  38 func (m *InterfaceMulticastAddrMessage) sockaddr() (sas []Sockaddr) {
  39         if m.Header.Addrs&rtaIfmaMask == 0 {
  40                 return nil
  41         }
  42         b := m.Data[:]
  43         for i := uint(0); i < RTAX_MAX; i++ {
  44                 if m.Header.Addrs&rtaIfmaMask&(1<<i) == 0 {
  45                         continue
  46                 }
  47                 rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
  48                 switch i {
  49                 case RTAX_IFA:
  50                         sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
  51                         if e != nil {
  52                                 return nil
  53                         }
  54                         sas = append(sas, sa)
  55                 case RTAX_GATEWAY, RTAX_IFP:
  56                         // nothing to do
  57                 }
  58                 b = b[rsaAlignOf(int(rsa.Len)):]
  59         }
  60         return sas
  61 }