1// Copyright 2016 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 route
6
7import "syscall"
8
9func (m *RouteMessage) marshal() ([]byte, error) {
10	l := sizeofRtMsghdr + addrsSpace(m.Addrs)
11	b := make([]byte, l)
12	nativeEndian.PutUint16(b[:2], uint16(l))
13	if m.Version == 0 {
14		b[2] = sysRTM_VERSION
15	} else {
16		b[2] = byte(m.Version)
17	}
18	b[3] = byte(m.Type)
19	nativeEndian.PutUint16(b[4:6], uint16(sizeofRtMsghdr))
20	nativeEndian.PutUint32(b[16:20], uint32(m.Flags))
21	nativeEndian.PutUint16(b[6:8], uint16(m.Index))
22	nativeEndian.PutUint32(b[24:28], uint32(m.ID))
23	nativeEndian.PutUint32(b[28:32], uint32(m.Seq))
24	attrs, err := marshalAddrs(b[sizeofRtMsghdr:], m.Addrs)
25	if err != nil {
26		return nil, err
27	}
28	if attrs > 0 {
29		nativeEndian.PutUint32(b[12:16], uint32(attrs))
30	}
31	return b, nil
32}
33
34func (*wireFormat) parseRouteMessage(_ RIBType, b []byte) (Message, error) {
35	if len(b) < sizeofRtMsghdr {
36		return nil, errMessageTooShort
37	}
38	l := int(nativeEndian.Uint16(b[:2]))
39	if len(b) < l {
40		return nil, errInvalidMessage
41	}
42	m := &RouteMessage{
43		Version: int(b[2]),
44		Type:    int(b[3]),
45		Flags:   int(nativeEndian.Uint32(b[16:20])),
46		Index:   int(nativeEndian.Uint16(b[6:8])),
47		ID:      uintptr(nativeEndian.Uint32(b[24:28])),
48		Seq:     int(nativeEndian.Uint32(b[28:32])),
49		raw:     b[:l],
50	}
51	ll := int(nativeEndian.Uint16(b[4:6]))
52	if len(b) < ll {
53		return nil, errInvalidMessage
54	}
55	errno := syscall.Errno(nativeEndian.Uint32(b[32:36]))
56	if errno != 0 {
57		m.Err = errno
58	}
59	as, err := parseAddrs(uint(nativeEndian.Uint32(b[12:16])), parseKernelInetAddr, b[ll:])
60	if err != nil {
61		return nil, err
62	}
63	m.Addrs = as
64	return m, nil
65}
66