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// 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.

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_NEWADDR, RTM_DELADDR:
		p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
		return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]}
	case RTM_NEWMADDR2, RTM_DELMADDR:
		p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
		return &InterfaceMulticastAddrMessage{Header: p.Header, Data: b[SizeofIfmaMsghdr2:any.Msglen]}
	}
	return nil
}

// InterfaceMulticastAddrMessage represents a routing message
// containing network interface address entries.
//
// Deprecated: Use golang.org/x/net/route instead.
type InterfaceMulticastAddrMessage struct {
	Header IfmaMsghdr2
	Data   []byte
}

func (m *InterfaceMulticastAddrMessage) sockaddr() ([]Sockaddr, error) {
	var sas [RTAX_MAX]Sockaddr
	b := m.Data[:]
	for i := uint(0); i < RTAX_MAX && len(b) >= minRoutingSockaddrLen; i++ {
		if m.Header.Addrs&(1<<i) == 0 {
			continue
		}
		rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
		switch rsa.Family {
		case AF_LINK:
			sa, err := parseSockaddrLink(b)
			if err != nil {
				return nil, err
			}
			sas[i] = sa
			b = b[rsaAlignOf(int(rsa.Len)):]
		case AF_INET, AF_INET6:
			sa, err := parseSockaddrInet(b, rsa.Family)
			if err != nil {
				return nil, err
			}
			sas[i] = sa
			b = b[rsaAlignOf(int(rsa.Len)):]
		default:
			sa, l, err := parseLinkLayerAddr(b)
			if err != nil {
				return nil, err
			}
			sas[i] = sa
			b = b[l:]
		}
	}
	return sas[:], nil
}