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
5package syscall
6
7import "unsafe"
8
9func (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//
35// Deprecated: Use golang.org/x/net/route instead.
36type InterfaceAnnounceMessage struct {
37	Header IfAnnounceMsghdr
38}
39
40func (m *InterfaceAnnounceMessage) sockaddr() ([]Sockaddr, error) { return nil, nil }
41
42// InterfaceMulticastAddrMessage represents a routing message
43// containing network interface address entries.
44//
45// Deprecated: Use golang.org/x/net/route instead.
46type InterfaceMulticastAddrMessage struct {
47	Header IfmaMsghdr
48	Data   []byte
49}
50
51func (m *InterfaceMulticastAddrMessage) sockaddr() ([]Sockaddr, error) {
52	var sas [RTAX_MAX]Sockaddr
53	b := m.Data[:]
54	for i := uint(0); i < RTAX_MAX && len(b) >= minRoutingSockaddrLen; i++ {
55		if m.Header.Addrs&(1<<i) == 0 {
56			continue
57		}
58		rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
59		switch rsa.Family {
60		case AF_LINK:
61			sa, err := parseSockaddrLink(b)
62			if err != nil {
63				return nil, err
64			}
65			sas[i] = sa
66			b = b[rsaAlignOf(int(rsa.Len)):]
67		case AF_INET, AF_INET6:
68			sa, err := parseSockaddrInet(b, rsa.Family)
69			if err != nil {
70				return nil, err
71			}
72			sas[i] = sa
73			b = b[rsaAlignOf(int(rsa.Len)):]
74		default:
75			sa, l, err := parseLinkLayerAddr(b)
76			if err != nil {
77				return nil, err
78			}
79			sas[i] = sa
80			b = b[l:]
81		}
82	}
83	return sas[:], nil
84}
85