code review 126960043: go.sys: copy files from syscall package to go.sys/{plan...

unix/route_dragonfly.go

+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Routing sockets and messages for Dragonfly
+
+package syscall
+
+import "unsafe"
+
+func (any *anyMessage) toRoutingMessage(b []byte) RoutingMessage {
+        switch any.Type {
+        case RTM_ADD, RTM_DELETE, RTM_CHANGE, RTM_GET, RTM_LOSING, RTM_REDIRECT, RTM_MISS, RTM_LOCK, RTM_RESOLVE:
+                p := (*RouteMessage)(unsafe.Pointer(any))
+                return &RouteMessage{Header: p.Header, Data: b[SizeofRtMsghdr:any.Msglen]}
+        case RTM_IFINFO:
+                p := (*InterfaceMessage)(unsafe.Pointer(any))
+                return &InterfaceMessage{Header: p.Header, Data: b[SizeofIfMsghdr:any.Msglen]}
+        case RTM_IFANNOUNCE:
+                p := (*InterfaceAnnounceMessage)(unsafe.Pointer(any))
+                return &InterfaceAnnounceMessage{Header: p.Header}
+        case RTM_NEWADDR, RTM_DELADDR:
+                p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
+                return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]}
+        case RTM_NEWMADDR, RTM_DELMADDR:
+                p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
+                return &InterfaceMulticastAddrMessage{Header: p.Header, Data: b[SizeofIfmaMsghdr:any.Msglen]}
+        }
+        return nil
+}
+
+// InterfaceAnnounceMessage represents a routing message containing
+// network interface arrival and departure information.
+type InterfaceAnnounceMessage struct {
+        Header IfAnnounceMsghdr
+}
+
+func (m *InterfaceAnnounceMessage) sockaddr() (sas []Sockaddr) { return nil }
+
+// InterfaceMulticastAddrMessage represents a routing message
+// containing network interface address entries.
+type InterfaceMulticastAddrMessage struct {
+        Header IfmaMsghdr
+        Data   []byte
+}
+
+const rtaIfmaMask = RTA_GATEWAY | RTA_IFP | RTA_IFA
+
+func (m *InterfaceMulticastAddrMessage) sockaddr() (sas []Sockaddr) {
+        if m.Header.Addrs&rtaIfmaMask == 0 {
+                return nil
+        }
+        b := m.Data[:]
+        for i := uint(0); i < RTAX_MAX; i++ {
+                if m.Header.Addrs&rtaIfmaMask&(1<<i) == 0 {
+                        continue
+                }
+                rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
+                switch i {
+                case RTAX_IFA:
+                        sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
+                        if e != nil {
+                                return nil
+                        }
+                        sas = append(sas, sa)
+                case RTAX_GATEWAY, RTAX_IFP:
+                        // nothing to do
+                }
+                b = b[rsaAlignOf(int(rsa.Len)):]
+        }
+        return sas
+}