Subversion Repositories openrisc

// 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 Darwin

package syscall

import (
        "unsafe"
)

func (any *anyMessage) toRoutingMessage(buf []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))
                rtm := &RouteMessage{}
                rtm.Header = p.Header
                rtm.Data = buf[SizeofRtMsghdr:any.Msglen]
                return rtm
        case RTM_IFINFO:
                p := (*InterfaceMessage)(unsafe.Pointer(any))
                ifm := &InterfaceMessage{}
                ifm.Header = p.Header
                ifm.Data = buf[SizeofIfMsghdr:any.Msglen]
                return ifm
        case RTM_NEWADDR, RTM_DELADDR:
                p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
                ifam := &InterfaceAddrMessage{}
                ifam.Header = p.Header
                ifam.Data = buf[SizeofIfaMsghdr:any.Msglen]
                return ifam
        case RTM_NEWMADDR2, RTM_DELMADDR:
                p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
                ifmam := &InterfaceMulticastAddrMessage{}
                ifmam.Header = p.Header
                ifmam.Data = buf[SizeofIfmaMsghdr2:any.Msglen]
                return ifmam
        }
        return nil
}

// InterfaceMulticastAddrMessage represents a routing message
// containing network interface address entries.
type InterfaceMulticastAddrMessage struct {
        Header IfmaMsghdr2
        Data   []byte
}

const rtaIfmaMask = RTA_GATEWAY | RTA_IFP | RTA_IFA

func (m *InterfaceMulticastAddrMessage) sockaddr() (sas []Sockaddr) {
        if m.Header.Addrs&rtaIfmaMask == 0 {
                return nil
        }

        buf := m.Data[:]
        for i := uint(0); i < RTAX_MAX; i++ {
                if m.Header.Addrs&rtaIfmaMask&(1<<i) == 0 {
                        continue
                }
                rsa := (*RawSockaddr)(unsafe.Pointer(&buf[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
                }
                buf = buf[rsaAlignOf(int(rsa.Len)):]
        }

        return sas
}