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 return &RouteMessage{Header: p.Header, Data: b[SizeofRtMsghdr:any.Msglen]} 14 case RTM_IFINFO: 15 p := (*InterfaceMessage)(unsafe.Pointer(any)) 16 return &InterfaceMessage{Header: p.Header, Data: b[SizeofIfMsghdr:any.Msglen]} 17 case RTM_NEWADDR, RTM_DELADDR: 18 p := (*InterfaceAddrMessage)(unsafe.Pointer(any)) 19 return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]} 20 case RTM_NEWMADDR2, RTM_DELMADDR: 21 p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any)) 22 return &InterfaceMulticastAddrMessage{Header: p.Header, Data: b[SizeofIfmaMsghdr2:any.Msglen]} 23 } 24 return nil 25 } 26 27 // InterfaceMulticastAddrMessage represents a routing message 28 // containing network interface address entries. 29 type InterfaceMulticastAddrMessage struct { 30 Header IfmaMsghdr2 31 Data []byte 32 } 33 34 func (m *InterfaceMulticastAddrMessage) sockaddr() ([]Sockaddr, error) { 35 var sas [RTAX_MAX]Sockaddr 36 b := m.Data[:] 37 for i := uint(0); i < RTAX_MAX && len(b) >= minRoutingSockaddrLen; i++ { 38 if m.Header.Addrs&(1<<i) == 0 { 39 continue 40 } 41 rsa := (*RawSockaddr)(unsafe.Pointer(&b[0])) 42 switch rsa.Family { 43 case AF_LINK: 44 sa, err := parseSockaddrLink(b) 45 if err != nil { 46 return nil, err 47 } 48 sas[i] = sa 49 b = b[rsaAlignOf(int(rsa.Len)):] 50 case AF_INET, AF_INET6: 51 sa, err := parseSockaddrInet(b, rsa.Family) 52 if err != nil { 53 return nil, err 54 } 55 sas[i] = sa 56 b = b[rsaAlignOf(int(rsa.Len)):] 57 default: 58 sa, l, err := parseLinkLayerAddr(b) 59 if err != nil { 60 return nil, err 61 } 62 sas[i] = sa 63 b = b[l:] 64 } 65 } 66 return sas[:], nil 67 } 68
