github.com/q45/go@v0.0.0-20151101211701-a4fb8c13db3f/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  type InterfaceAnnounceMessage struct {
    35  	Header IfAnnounceMsghdr
    36  }
    37  
    38  func (m *InterfaceAnnounceMessage) sockaddr() ([]Sockaddr, error) { return nil, 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  func (m *InterfaceMulticastAddrMessage) sockaddr() ([]Sockaddr, error) {
    48  	var sas [RTAX_MAX]Sockaddr
    49  	b := m.Data[:]
    50  	for i := uint(0); i < RTAX_MAX && len(b) >= minRoutingSockaddrLen; i++ {
    51  		if m.Header.Addrs&(1<<i) == 0 {
    52  			continue
    53  		}
    54  		rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
    55  		switch rsa.Family {
    56  		case AF_LINK:
    57  			sa, err := parseSockaddrLink(b)
    58  			if err != nil {
    59  				return nil, err
    60  			}
    61  			sas[i] = sa
    62  			b = b[rsaAlignOf(int(rsa.Len)):]
    63  		case AF_INET, AF_INET6:
    64  			sa, err := parseSockaddrInet(b, rsa.Family)
    65  			if err != nil {
    66  				return nil, err
    67  			}
    68  			sas[i] = sa
    69  			b = b[rsaAlignOf(int(rsa.Len)):]
    70  		default:
    71  			sa, l, err := parseLinkLayerAddr(b)
    72  			if err != nil {
    73  				return nil, err
    74  			}
    75  			sas[i] = sa
    76  			b = b[l:]
    77  		}
    78  	}
    79  	return sas[:], nil
    80  }