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 package syscall
   6
   7 import "unsafe"
   8
   9 // See http://www.freebsd.org/doc/en/books/porters-handbook/freebsd-versions.html.
  10 var freebsdVersion uint32
  11
  12 func init() {
  13         freebsdVersion, _ = SysctlUint32("kern.osreldate")
  14         conf, _ := Sysctl("kern.conftxt")
  15         for i, j := 0, 0; j < len(conf); j++ {
  16                 if conf[j] != '\n' {
  17                         continue
  18                 }
  19                 s := conf[i:j]
  20                 i = j + 1
  21                 if len(s) > len("machine") && s[:len("machine")] == "machine" {
  22                         s = s[len("machine"):]
  23                         for k := 0; k < len(s); k++ {
  24                                 if s[k] == ' ' || s[k] == '\t' {
  25                                         s = s[1:]
  26                                 }
  27                                 break
  28                         }
  29                         freebsdConfArch = s
  30                         break
  31                 }
  32         }
  33 }
  34
  35 func (any *anyMessage) toRoutingMessage(b []byte) RoutingMessage {
  36         switch any.Type {
  37         case RTM_ADD, RTM_DELETE, RTM_CHANGE, RTM_GET, RTM_LOSING, RTM_REDIRECT, RTM_MISS, RTM_LOCK, RTM_RESOLVE:
  38                 return any.parseRouteMessage(b)
  39         case RTM_IFINFO:
  40                 return any.parseInterfaceMessage(b)
  41         case RTM_IFANNOUNCE:
  42                 p := (*InterfaceAnnounceMessage)(unsafe.Pointer(any))
  43                 return &InterfaceAnnounceMessage{Header: p.Header}
  44         case RTM_NEWADDR, RTM_DELADDR:
  45                 p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
  46                 return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]}
  47         case RTM_NEWMADDR, RTM_DELMADDR:
  48                 p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
  49                 return &InterfaceMulticastAddrMessage{Header: p.Header, Data: b[SizeofIfmaMsghdr:any.Msglen]}
  50         }
  51         return nil
  52 }
  53
  54 // InterfaceAnnounceMessage represents a routing message containing
  55 // network interface arrival and departure information.
  56 type InterfaceAnnounceMessage struct {
  57         Header IfAnnounceMsghdr
  58 }
  59
  60 func (m *InterfaceAnnounceMessage) sockaddr() ([]Sockaddr, error) { return nil, nil }
  61
  62 // InterfaceMulticastAddrMessage represents a routing message
  63 // containing network interface address entries.
  64 type InterfaceMulticastAddrMessage struct {
  65         Header IfmaMsghdr
  66         Data   []byte
  67 }
  68
  69 func (m *InterfaceMulticastAddrMessage) sockaddr() ([]Sockaddr, error) {
  70         var sas [RTAX_MAX]Sockaddr
  71         b := m.Data[:]
  72         for i := uint(0); i < RTAX_MAX && len(b) >= minRoutingSockaddrLen; i++ {
  73                 if m.Header.Addrs&(1<<i) == 0 {
  74                         continue
  75                 }
  76                 rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
  77                 switch rsa.Family {
  78                 case AF_LINK:
  79                         sa, err := parseSockaddrLink(b)
  80                         if err != nil {
  81                                 return nil, err
  82                         }
  83                         sas[i] = sa
  84                         b = b[rsaAlignOf(int(rsa.Len)):]
  85                 case AF_INET, AF_INET6:
  86                         sa, err := parseSockaddrInet(b, rsa.Family)
  87                         if err != nil {
  88                                 return nil, err
  89                         }
  90                         sas[i] = sa
  91                         b = b[rsaAlignOf(int(rsa.Len)):]
  92                 default:
  93                         sa, l, err := parseLinkLayerAddr(b)
  94                         if err != nil {
  95                                 return nil, err
  96                         }
  97                         sas[i] = sa
  98                         b = b[l:]
  99                 }
 100         }
 101         return sas[:], nil
 102 }