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
7func (*wireFormat) parseInterfaceMessage(_ RIBType, b []byte) (Message, error) {
8	if len(b) < 32 {
9		return nil, errMessageTooShort
10	}
11	l := int(nativeEndian.Uint16(b[:2]))
12	if len(b) < l {
13		return nil, errInvalidMessage
14	}
15	attrs := uint(nativeEndian.Uint32(b[12:16]))
16	if attrs&sysRTA_IFP == 0 {
17		return nil, nil
18	}
19	m := &InterfaceMessage{
20		Version: int(b[2]),
21		Type:    int(b[3]),
22		Flags:   int(nativeEndian.Uint32(b[16:20])),
23		Index:   int(nativeEndian.Uint16(b[6:8])),
24		Addrs:   make([]Addr, sysRTAX_MAX),
25		raw:     b[:l],
26	}
27	ll := int(nativeEndian.Uint16(b[4:6]))
28	if len(b) < ll {
29		return nil, errInvalidMessage
30	}
31	a, err := parseLinkAddr(b[ll:])
32	if err != nil {
33		return nil, err
34	}
35	m.Addrs[sysRTAX_IFP] = a
36	m.Name = a.(*LinkAddr).Name
37	return m, nil
38}
39
40func (*wireFormat) parseInterfaceAddrMessage(_ RIBType, b []byte) (Message, error) {
41	if len(b) < 24 {
42		return nil, errMessageTooShort
43	}
44	l := int(nativeEndian.Uint16(b[:2]))
45	if len(b) < l {
46		return nil, errInvalidMessage
47	}
48	bodyOff := int(nativeEndian.Uint16(b[4:6]))
49	if len(b) < bodyOff {
50		return nil, errInvalidMessage
51	}
52	m := &InterfaceAddrMessage{
53		Version: int(b[2]),
54		Type:    int(b[3]),
55		Flags:   int(nativeEndian.Uint32(b[12:16])),
56		Index:   int(nativeEndian.Uint16(b[6:8])),
57		raw:     b[:l],
58	}
59	var err error
60	m.Addrs, err = parseAddrs(uint(nativeEndian.Uint32(b[12:16])), parseKernelInetAddr, b[bodyOff:])
61	if err != nil {
62		return nil, err
63	}
64	return m, nil
65}
66
67func (*wireFormat) parseInterfaceAnnounceMessage(_ RIBType, b []byte) (Message, error) {
68	if len(b) < 26 {
69		return nil, errMessageTooShort
70	}
71	l := int(nativeEndian.Uint16(b[:2]))
72	if len(b) < l {
73		return nil, errInvalidMessage
74	}
75	m := &InterfaceAnnounceMessage{
76		Version: int(b[2]),
77		Type:    int(b[3]),
78		Index:   int(nativeEndian.Uint16(b[6:8])),
79		What:    int(nativeEndian.Uint16(b[8:10])),
80		raw:     b[:l],
81	}
82	for i := 0; i < 16; i++ {
83		if b[10+i] != 0 {
84			continue
85		}
86		m.Name = string(b[10 : 10+i])
87		break
88	}
89	return m, nil
90}
91