1 /*
2 * Copyright (c) 2017, The OpenThread Authors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the copyright holder nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /**
30 * @file
31 * This file implements IP6 header processing.
32 */
33
34 #include "ip6_headers.hpp"
35
36 #include "net/ip6.hpp"
37
38 namespace ot {
39 namespace Ip6 {
40
ParseFrom(const Message & aMessage)41 Error Header::ParseFrom(const Message &aMessage)
42 {
43 Error error = kErrorParse;
44
45 SuccessOrExit(aMessage.Read(0, *this));
46 VerifyOrExit(IsValid());
47 VerifyOrExit(sizeof(Header) + GetPayloadLength() == aMessage.GetLength());
48
49 error = kErrorNone;
50
51 exit:
52 return error;
53 }
54
IsValid(void) const55 bool Header::IsValid(void) const
56 {
57 #if !OPENTHREAD_CONFIG_IP6_FRAGMENTATION_ENABLE
58 static constexpr uint32_t kMaxLength = kMaxDatagramLength;
59 #else
60 static constexpr uint32_t kMaxLength = kMaxAssembledDatagramLength;
61 #endif
62
63 return IsVersion6() && ((sizeof(Header) + GetPayloadLength()) <= kMaxLength);
64 }
65
66 } // namespace Ip6
67 } // namespace ot
68