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
Init(const Message & aMessage)41 Error Header::Init(const Message &aMessage)
42 {
43 Error error = kErrorNone;
44
45 SuccessOrExit(error = aMessage.Read(0, *this));
46
47 VerifyOrExit(IsValid(), error = kErrorParse);
48 VerifyOrExit((sizeof(*this) + GetPayloadLength()) == aMessage.GetLength(), error = kErrorParse);
49
50 exit:
51 return error;
52 }
53
IsValid(void) const54 bool Header::IsValid(void) const
55 {
56 bool ret = true;
57
58 // check Version
59 VerifyOrExit(IsVersion6(), ret = false);
60
61 // check Payload Length
62 #if !OPENTHREAD_CONFIG_IP6_FRAGMENTATION_ENABLE
63 VerifyOrExit((sizeof(*this) + GetPayloadLength()) <= Ip6::kMaxDatagramLength, ret = false);
64 #else
65 VerifyOrExit((sizeof(*this) + GetPayloadLength()) <= Ip6::kMaxAssembledDatagramLength, ret = false);
66 #endif
67
68 exit:
69 return ret;
70 }
71
72 } // namespace Ip6
73 } // namespace ot
74
