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 (
  10         "unsafe"
  11 )
  12
  13 func (any *anyMessage) toRoutingMessage(buf []byte) RoutingMessage {
  14         switch any.Type {
  15         case RTM_ADD, RTM_DELETE, RTM_CHANGE, RTM_GET, RTM_LOSING, RTM_REDIRECT, RTM_MISS, RTM_LOCK, RTM_RESOLVE:
  16                 p := (*RouteMessage)(unsafe.Pointer(any))
  17                 rtm := &RouteMessage{}
  18                 rtm.Header = p.Header
  19                 rtm.Data = buf[SizeofRtMsghdr:any.Msglen]
  20                 return rtm
  21         case RTM_IFINFO:
  22                 p := (*InterfaceMessage)(unsafe.Pointer(any))
  23                 ifm := &InterfaceMessage{}
  24                 ifm.Header = p.Header
  25                 ifm.Data = buf[SizeofIfMsghdr:any.Msglen]
  26                 return ifm
  27         case RTM_NEWADDR, RTM_DELADDR:
  28                 p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
  29                 ifam := &InterfaceAddrMessage{}
  30                 ifam.Header = p.Header
  31                 ifam.Data = buf[SizeofIfaMsghdr:any.Msglen]
  32                 return ifam
  33         case RTM_NEWMADDR, RTM_DELMADDR:
  34                 p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
  35                 ifmam := &InterfaceMulticastAddrMessage{}
  36                 ifmam.Header = p.Header
  37                 ifmam.Data = buf[SizeofIfmaMsghdr:any.Msglen]
  38                 return ifmam
  39         }
  40         return nil
  41 }
  42
  43 // InterfaceMulticastAddrMessage represents a routing message
  44 // containing network interface address entries.
  45 type InterfaceMulticastAddrMessage struct {
  46         Header IfmaMsghdr
  47         Data   []byte
  48 }
  49
  50 const rtaIfmaMask = RTA_GATEWAY | RTA_IFP | RTA_IFA
  51
  52 func (m *InterfaceMulticastAddrMessage) sockaddr() (sas []Sockaddr) {
  53         if m.Header.Addrs&rtaIfmaMask == 0 {
  54                 return nil
  55         }
  56
  57         buf := m.Data[:]
  58         for i := uint(0); i < RTAX_MAX; i++ {
  59                 if m.Header.Addrs&rtaIfmaMask&(1<<i) == 0 {
  60                         continue
  61                 }
  62                 rsa := (*RawSockaddr)(unsafe.Pointer(&buf[0]))
  63                 switch i {
  64                 case RTAX_IFA:
  65                         sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
  66                         if e != nil {
  67                                 return nil
  68                         }
  69                         sas = append(sas, sa)
  70                 case RTAX_GATEWAY, RTAX_IFP:
  71                         // nothing to do
  72                 }
  73                 buf = buf[rsaAlignOf(int(rsa.Len)):]
  74         }
  75
  76         return sas
  77 }