github.com/spotify/syslog-redirector-golang@v0.0.0-20140320174030-4859f03d829a/src/pkg/syscall/route_dragonfly.go (about)

     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 Dragonfly
     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  }