github.com/tidwall/go@v0.0.0-20170415222209-6694a6888b7d/src/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  package syscall
     6  
     7  import "unsafe"
     8  
     9  func (any *anyMessage) toRoutingMessage(b []byte) RoutingMessage {
    10  	switch any.Type {
    11  	case RTM_ADD, RTM_DELETE, RTM_CHANGE, RTM_GET, RTM_LOSING, RTM_REDIRECT, RTM_MISS, RTM_LOCK, RTM_RESOLVE:
    12  		p := (*RouteMessage)(unsafe.Pointer(any))
    13  		// We don't support sockaddr_mpls for now.
    14  		p.Header.Addrs &= RTA_DST | RTA_GATEWAY | RTA_NETMASK | RTA_GENMASK | RTA_IFA | RTA_IFP | RTA_BRD | RTA_AUTHOR
    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 departure information.
    34  //
    35  // Deprecated: Use golang.org/x/net/route instead.
    36  type InterfaceAnnounceMessage struct {
    37  	Header IfAnnounceMsghdr
    38  }
    39  
    40  func (m *InterfaceAnnounceMessage) sockaddr() ([]Sockaddr, error) { return nil, nil }
    41  
    42  // InterfaceMulticastAddrMessage represents a routing message
    43  // containing network interface address entries.
    44  //
    45  // Deprecated: Use golang.org/x/net/route instead.
    46  type InterfaceMulticastAddrMessage struct {
    47  	Header IfmaMsghdr
    48  	Data   []byte
    49  }
    50  
    51  func (m *InterfaceMulticastAddrMessage) sockaddr() ([]Sockaddr, error) {
    52  	var sas [RTAX_MAX]Sockaddr
    53  	b := m.Data[:]
    54  	for i := uint(0); i < RTAX_MAX && len(b) >= minRoutingSockaddrLen; i++ {
    55  		if m.Header.Addrs&(1<<i) == 0 {
    56  			continue
    57  		}
    58  		rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
    59  		switch rsa.Family {
    60  		case AF_LINK:
    61  			sa, err := parseSockaddrLink(b)
    62  			if err != nil {
    63  				return nil, err
    64  			}
    65  			sas[i] = sa
    66  			b = b[rsaAlignOf(int(rsa.Len)):]
    67  		case AF_INET, AF_INET6:
    68  			sa, err := parseSockaddrInet(b, rsa.Family)
    69  			if err != nil {
    70  				return nil, err
    71  			}
    72  			sas[i] = sa
    73  			b = b[rsaAlignOf(int(rsa.Len)):]
    74  		default:
    75  			sa, l, err := parseLinkLayerAddr(b)
    76  			if err != nil {
    77  				return nil, err
    78  			}
    79  			sas[i] = sa
    80  			b = b[l:]
    81  		}
    82  	}
    83  	return sas[:], nil
    84  }