| /* |
| * Copyright (c) 2016, The OpenThread Authors. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holder nor the |
| * names of its contributors may be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** |
| * @file |
| * This file includes definitions for IPv6 packet processing. |
| */ |
| |
| #ifndef IP6_HPP_ |
| #define IP6_HPP_ |
| |
| #include "openthread-core-config.h" |
| |
| #include <stddef.h> |
| |
| #include <openthread/ip6.h> |
| #include <openthread/udp.h> |
| |
| #include "common/encoding.hpp" |
| #include "common/locator.hpp" |
| #include "common/message.hpp" |
| #include "common/non_copyable.hpp" |
| #include "common/timer.hpp" |
| #include "net/icmp6.hpp" |
| #include "net/ip6_address.hpp" |
| #include "net/ip6_headers.hpp" |
| #include "net/ip6_mpl.hpp" |
| #include "net/netif.hpp" |
| #include "net/socket.hpp" |
| #include "net/udp6.hpp" |
| |
| namespace ot { |
| |
| /** |
| * @namespace ot::Ip6 |
| * |
| * @brief |
| * This namespace includes definitions for IPv6 networking. |
| * |
| */ |
| namespace Ip6 { |
| |
| using ot::Encoding::BigEndian::HostSwap16; |
| using ot::Encoding::BigEndian::HostSwap32; |
| |
| /** |
| * @addtogroup core-ipv6 |
| * |
| * @brief |
| * This module includes definitions for the IPv6 network layer. |
| * |
| * @{ |
| * |
| * @defgroup core-ip6-icmp6 ICMPv6 |
| * @defgroup core-ip6-ip6 IPv6 |
| * @defgroup core-ip6-mpl MPL |
| * @defgroup core-ip6-netif Network Interfaces |
| * |
| * @} |
| * |
| */ |
| |
| /** |
| * @addtogroup core-ip6-ip6 |
| * |
| * @brief |
| * This module includes definitions for core IPv6 networking. |
| * |
| * @{ |
| * |
| */ |
| |
| /** |
| * This class implements the core IPv6 message processing. |
| * |
| */ |
| class Ip6 : public InstanceLocator, private NonCopyable |
| { |
| friend class ot::Instance; |
| |
| public: |
| enum |
| { |
| kDefaultHopLimit = OPENTHREAD_CONFIG_IP6_HOP_LIMIT_DEFAULT, |
| kMaxDatagramLength = OPENTHREAD_CONFIG_IP6_MAX_DATAGRAM_LENGTH, |
| kMaxAssembledDatagramLength = OPENTHREAD_CONFIG_IP6_MAX_ASSEMBLED_DATAGRAM, |
| kIp6ReassemblyTimeout = OPENTHREAD_CONFIG_IP6_REASSEMBLY_TIMEOUT, |
| kMinimalMtu = 1280, |
| kStateUpdatePeriod = 1000, |
| }; |
| |
| /** |
| * This method allocates a new message buffer from the buffer pool. |
| * |
| * @param[in] aReserved The number of header bytes to reserve following the IPv6 header. |
| * @param[in] aSettings The message settings. |
| * |
| * @returns A pointer to the message or nullptr if insufficient message buffers are available. |
| * |
| */ |
| Message *NewMessage(uint16_t aReserved, const Message::Settings &aSettings = Message::Settings::GetDefault()); |
| |
| /** |
| * This method allocates a new message buffer from the buffer pool and writes the IPv6 datagram to the message. |
| * |
| * @param[in] aData A pointer to the IPv6 datagram buffer. |
| * @param[in] aDataLength The size of the IPV6 datagram buffer pointed by @p aData. |
| * @param[in] aSettings The message settings. |
| * |
| * @returns A pointer to the message or nullptr if malformed IPv6 header or insufficient message buffers are |
| * available. |
| * |
| */ |
| Message *NewMessage(const uint8_t *aData, uint16_t aDataLength, const Message::Settings &aSettings); |
| |
| /** |
| * This method allocates a new message buffer from the buffer pool and writes the IPv6 datagram to the message. |
| * |
| * @note The link layer security is enabled and the message priority is obtained from IPv6 message itself. |
| * |
| * @param[in] aData A pointer to the IPv6 datagram buffer. |
| * @param[in] aDataLength The size of the IPV6 datagram buffer pointed by @p aData. |
| * |
| * @returns A pointer to the message or nullptr if malformed IPv6 header or insufficient message buffers are |
| * available. |
| * |
| */ |
| Message *NewMessage(const uint8_t *aData, uint16_t aDataLength); |
| |
| /** |
| * This method converts the message priority level to IPv6 DSCP value. |
| * |
| * @param[in] aPriority The message priority level. |
| * |
| * @returns The IPv6 DSCP value. |
| * |
| */ |
| static uint8_t PriorityToDscp(Message::Priority aPriority); |
| |
| /** |
| * This method converts the IPv6 DSCP value to message priority level. |
| * |
| * @param[in] aDscp The IPv6 DSCP value. |
| * |
| * @returns The message priority level. |
| * |
| */ |
| static Message::Priority DscpToPriority(uint8_t aDscp); |
| |
| /** |
| * This constructor initializes the object. |
| * |
| * @param[in] aInstance A reference to the otInstance object. |
| * |
| */ |
| explicit Ip6(Instance &aInstance); |
| |
| /** |
| * This method sends an IPv6 datagram. |
| * |
| * @param[in] aMessage A reference to the message. |
| * @param[in] aMessageInfo A reference to the message info associated with @p aMessage. |
| * @param[in] aIpProto The Internet Protocol value. |
| * |
| * @retval OT_ERROR_NONE Successfully enqueued the message into an output interface. |
| * @retval OT_ERROR_NO_BUFS Insufficient available buffer to add the IPv6 headers. |
| * |
| */ |
| otError SendDatagram(Message &aMessage, MessageInfo &aMessageInfo, uint8_t aIpProto); |
| |
| /** |
| * This method sends a raw IPv6 datagram with a fully formed IPv6 header. |
| * |
| * The caller transfers ownership of @p aMessage when making this call. OpenThread will free @p aMessage when |
| * processing is complete, including when a value other than `OT_ERROR_NONE` is returned. |
| * |
| * @param[in] aMessage A reference to the message. |
| * |
| * @retval OT_ERROR_NONE Successfully processed the message. |
| * @retval OT_ERROR_DROP Message was well-formed but not fully processed due to packet processing rules. |
| * @retval OT_ERROR_NO_BUFS Could not allocate necessary message buffers when processing the datagram. |
| * @retval OT_ERROR_NO_ROUTE No route to host. |
| * @retval OT_ERROR_PARSE Encountered a malformed header when processing the message. |
| * |
| */ |
| otError SendRaw(Message &aMessage); |
| |
| /** |
| * This method processes a received IPv6 datagram. |
| * |
| * @param[in] aMessage A reference to the message. |
| * @param[in] aNetif A pointer to the network interface that received the message. |
| * @param[in] aLinkMessageInfo A pointer to link-specific message information. |
| * @param[in] aFromNcpHost TRUE if the message was submitted by the NCP host, FALSE otherwise. |
| * |
| * @retval OT_ERROR_NONE Successfully processed the message. |
| * @retval OT_ERROR_DROP Message was well-formed but not fully processed due to packet processing rules. |
| * @retval OT_ERROR_NO_BUFS Could not allocate necessary message buffers when processing the datagram. |
| * @retval OT_ERROR_NO_ROUTE No route to host. |
| * @retval OT_ERROR_PARSE Encountered a malformed header when processing the message. |
| * |
| */ |
| otError HandleDatagram(Message &aMessage, Netif *aNetif, const void *aLinkMessageInfo, bool aFromNcpHost); |
| |
| /** |
| * This methods adds a full IPv6 packet to the transmit queue. |
| * |
| * @param aMessage A reference to the message. |
| */ |
| void EnqueueDatagram(Message &aMessage); |
| |
| /** |
| * This static method updates a checksum. |
| * |
| * @param[in] aChecksum The checksum value to update. |
| * @param[in] aAddress A reference to an IPv6 address. |
| * |
| * @returns The updated checksum. |
| * |
| */ |
| static uint16_t UpdateChecksum(uint16_t aChecksum, const Address &aAddress); |
| |
| /** |
| * This static method computes the pseudoheader checksum. |
| * |
| * @param[in] aSource A reference to the IPv6 source address. |
| * @param[in] aDestination A reference to the IPv6 destination address. |
| * @param[in] aLength The IPv6 Payload Length value. |
| * @param[in] aProto The IPv6 Next Header value. |
| * |
| * @returns The pseudoheader checksum. |
| * |
| */ |
| static uint16_t ComputePseudoheaderChecksum(const Address &aSource, |
| const Address &aDestination, |
| uint16_t aLength, |
| uint8_t aProto); |
| |
| /** |
| * This method registers a callback to provide received raw IPv6 datagrams. |
| * |
| * By default, this callback does not pass Thread control traffic. See SetReceiveIp6FilterEnabled() to change |
| * the Thread control traffic filter setting. |
| * |
| * @param[in] aCallback A pointer to a function that is called when an IPv6 datagram is received |
| * or nullptr to disable the callback. |
| * @param[in] aCallbackContext A pointer to application-specific context. |
| * |
| * @sa IsReceiveIp6FilterEnabled |
| * @sa SetReceiveIp6FilterEnabled |
| * |
| */ |
| void SetReceiveDatagramCallback(otIp6ReceiveCallback aCallback, void *aCallbackContext); |
| |
| /** |
| * This method indicates whether or not Thread control traffic is filtered out when delivering IPv6 datagrams |
| * via the callback specified in SetReceiveIp6DatagramCallback(). |
| * |
| * @returns TRUE if Thread control traffic is filtered out, FALSE otherwise. |
| * |
| * @sa SetReceiveDatagramCallback |
| * @sa SetReceiveIp6FilterEnabled |
| * |
| */ |
| bool IsReceiveIp6FilterEnabled(void) const { return mIsReceiveIp6FilterEnabled; } |
| |
| /** |
| * This method sets whether or not Thread control traffic is filtered out when delivering IPv6 datagrams |
| * via the callback specified in SetReceiveIp6DatagramCallback(). |
| * |
| * @param[in] aEnabled TRUE if Thread control traffic is filtered out, FALSE otherwise. |
| * |
| * @sa SetReceiveDatagramCallback |
| * @sa IsReceiveIp6FilterEnabled |
| * |
| */ |
| void SetReceiveIp6FilterEnabled(bool aEnabled) { mIsReceiveIp6FilterEnabled = aEnabled; } |
| |
| /** |
| * This method indicates whether or not IPv6 forwarding is enabled. |
| * |
| * @returns TRUE if IPv6 forwarding is enabled, FALSE otherwise. |
| * |
| */ |
| bool IsForwardingEnabled(void) const { return mForwardingEnabled; } |
| |
| /** |
| * This method enables/disables IPv6 forwarding. |
| * |
| * @param[in] aEnable TRUE to enable IPv6 forwarding, FALSE otherwise. |
| * |
| */ |
| void SetForwardingEnabled(bool aEnable) { mForwardingEnabled = aEnable; } |
| |
| /** |
| * This method perform default source address selection. |
| * |
| * @param[in] aMessageInfo A reference to the message information. |
| * |
| * @returns A pointer to the selected IPv6 source address or nullptr if no source address was found. |
| * |
| */ |
| const NetifUnicastAddress *SelectSourceAddress(MessageInfo &aMessageInfo); |
| |
| /** |
| * This method returns a reference to the send queue. |
| * |
| * @returns A reference to the send queue. |
| * |
| */ |
| const PriorityQueue &GetSendQueue(void) const { return mSendQueue; } |
| |
| /** |
| * This static method converts an `IpProto` enumeration to a string. |
| * |
| * @returns The string representation of an IP protocol enumeration. |
| * |
| */ |
| static const char *IpProtoToString(uint8_t aIpProto); |
| |
| private: |
| enum |
| { |
| kDefaultIp6MessagePriority = Message::kPriorityNormal, |
| }; |
| |
| static void HandleSendQueue(Tasklet &aTasklet); |
| void HandleSendQueue(void); |
| |
| static otError GetDatagramPriority(const uint8_t *aData, uint16_t aDataLen, Message::Priority &aPriority); |
| |
| otError ProcessReceiveCallback(const Message & aMessage, |
| const MessageInfo &aMessageInfo, |
| uint8_t aIpProto, |
| bool aFromNcpHost); |
| otError HandleExtensionHeaders(Message & aMessage, |
| Netif * aNetif, |
| MessageInfo &aMessageInfo, |
| Header & aHeader, |
| uint8_t & aNextHeader, |
| bool aForward, |
| bool aFromNcpHost, |
| bool aReceive); |
| otError FragmentDatagram(Message &aMessage, uint8_t aIpProto); |
| otError HandleFragment(Message &aMessage, Netif *aNetif, MessageInfo &aMessageInfo, bool aFromNcpHost); |
| #if OPENTHREAD_CONFIG_IP6_FRAGMENTATION_ENABLE |
| void CleanupFragmentationBuffer(void); |
| void HandleUpdateTimer(void); |
| void UpdateReassemblyList(void); |
| void SendIcmpError(Message &aMessage, Icmp::Header::Type aIcmpType, Icmp::Header::Code aIcmpCode); |
| static void HandleTimer(Timer &aTimer); |
| #endif |
| otError AddMplOption(Message &aMessage, Header &aHeader); |
| otError AddTunneledMplOption(Message &aMessage, Header &aHeader, MessageInfo &aMessageInfo); |
| otError InsertMplOption(Message &aMessage, Header &aHeader, MessageInfo &aMessageInfo); |
| otError RemoveMplOption(Message &aMessage); |
| otError HandleOptions(Message &aMessage, Header &aHeader, bool &aForward); |
| otError HandlePayload(Message &aMessage, MessageInfo &aMessageInfo, uint8_t aIpProto); |
| bool ShouldForwardToThread(const MessageInfo &aMessageInfo) const; |
| bool IsOnLink(const Address &aAddress) const; |
| |
| bool mForwardingEnabled; |
| bool mIsReceiveIp6FilterEnabled; |
| otIp6ReceiveCallback mReceiveIp6DatagramCallback; |
| void * mReceiveIp6DatagramCallbackContext; |
| |
| PriorityQueue mSendQueue; |
| Tasklet mSendQueueTask; |
| |
| Icmp mIcmp; |
| Udp mUdp; |
| Mpl mMpl; |
| |
| #if OPENTHREAD_CONFIG_IP6_FRAGMENTATION_ENABLE |
| TimerMilli mTimer; |
| MessageQueue mReassemblyList; |
| #endif |
| }; |
| |
| /** |
| * @} |
| * |
| */ |
| |
| } // namespace Ip6 |
| } // namespace ot |
| |
| #endif // IP6_HPP_ |